Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/drivers/power/ab8500_charger.c

  1 /*
  2  * Copyright (C) ST-Ericsson SA 2012
  3  *
  4  * Charger driver for AB8500
  5  *
  6  * License Terms: GNU General Public License v2
  7  * Author:
  8  *      Johan Palsson <johan.palsson@stericsson.com>
  9  *      Karl Komierowski <karl.komierowski@stericsson.com>
 10  *      Arun R Murthy <arun.murthy@stericsson.com>
 11  */
 12 
 13 #include <linux/init.h>
 14 #include <linux/module.h>
 15 #include <linux/device.h>
 16 #include <linux/interrupt.h>
 17 #include <linux/delay.h>
 18 #include <linux/notifier.h>
 19 #include <linux/slab.h>
 20 #include <linux/platform_device.h>
 21 #include <linux/power_supply.h>
 22 #include <linux/completion.h>
 23 #include <linux/regulator/consumer.h>
 24 #include <linux/err.h>
 25 #include <linux/workqueue.h>
 26 #include <linux/kobject.h>
 27 #include <linux/of.h>
 28 #include <linux/mfd/core.h>
 29 #include <linux/mfd/abx500/ab8500.h>
 30 #include <linux/mfd/abx500.h>
 31 #include <linux/mfd/abx500/ab8500-bm.h>
 32 #include <linux/mfd/abx500/ab8500-gpadc.h>
 33 #include <linux/mfd/abx500/ux500_chargalg.h>
 34 #include <linux/usb/otg.h>
 35 #include <linux/mutex.h>
 36 
 37 /* Charger constants */
 38 #define NO_PW_CONN                      0
 39 #define AC_PW_CONN                      1
 40 #define USB_PW_CONN                     2
 41 
 42 #define MAIN_WDOG_ENA                   0x01
 43 #define MAIN_WDOG_KICK                  0x02
 44 #define MAIN_WDOG_DIS                   0x00
 45 #define CHARG_WD_KICK                   0x01
 46 #define MAIN_CH_ENA                     0x01
 47 #define MAIN_CH_NO_OVERSHOOT_ENA_N      0x02
 48 #define USB_CH_ENA                      0x01
 49 #define USB_CHG_NO_OVERSHOOT_ENA_N      0x02
 50 #define MAIN_CH_DET                     0x01
 51 #define MAIN_CH_CV_ON                   0x04
 52 #define USB_CH_CV_ON                    0x08
 53 #define VBUS_DET_DBNC100                0x02
 54 #define VBUS_DET_DBNC1                  0x01
 55 #define OTP_ENABLE_WD                   0x01
 56 #define DROP_COUNT_RESET                0x01
 57 #define USB_CH_DET                      0x01
 58 
 59 #define MAIN_CH_INPUT_CURR_SHIFT        4
 60 #define VBUS_IN_CURR_LIM_SHIFT          4
 61 #define AB8540_VBUS_IN_CURR_LIM_SHIFT   2
 62 #define AUTO_VBUS_IN_CURR_LIM_SHIFT     4
 63 #define AB8540_AUTO_VBUS_IN_CURR_MASK   0x3F
 64 #define VBUS_IN_CURR_LIM_RETRY_SET_TIME 30 /* seconds */
 65 
 66 #define LED_INDICATOR_PWM_ENA           0x01
 67 #define LED_INDICATOR_PWM_DIS           0x00
 68 #define LED_IND_CUR_5MA                 0x04
 69 #define LED_INDICATOR_PWM_DUTY_252_256  0xBF
 70 
 71 /* HW failure constants */
 72 #define MAIN_CH_TH_PROT                 0x02
 73 #define VBUS_CH_NOK                     0x08
 74 #define USB_CH_TH_PROT                  0x02
 75 #define VBUS_OVV_TH                     0x01
 76 #define MAIN_CH_NOK                     0x01
 77 #define VBUS_DET                        0x80
 78 
 79 #define MAIN_CH_STATUS2_MAINCHGDROP             0x80
 80 #define MAIN_CH_STATUS2_MAINCHARGERDETDBNC      0x40
 81 #define USB_CH_VBUSDROP                         0x40
 82 #define USB_CH_VBUSDETDBNC                      0x01
 83 
 84 /* UsbLineStatus register bit masks */
 85 #define AB8500_USB_LINK_STATUS          0x78
 86 #define AB8505_USB_LINK_STATUS          0xF8
 87 #define AB8500_STD_HOST_SUSP            0x18
 88 #define USB_LINK_STATUS_SHIFT           3
 89 
 90 /* Watchdog timeout constant */
 91 #define WD_TIMER                        0x30 /* 4min */
 92 #define WD_KICK_INTERVAL                (60 * HZ)
 93 
 94 /* Lowest charger voltage is 3.39V -> 0x4E */
 95 #define LOW_VOLT_REG                    0x4E
 96 
 97 /* Step up/down delay in us */
 98 #define STEP_UDELAY                     1000
 99 
100 #define CHARGER_STATUS_POLL 10 /* in ms */
101 
102 #define CHG_WD_INTERVAL                 (60 * HZ)
103 
104 #define AB8500_SW_CONTROL_FALLBACK      0x03
105 /* Wait for enumeration before charing in us */
106 #define WAIT_ACA_RID_ENUMERATION        (5 * 1000)
107 /*External charger control*/
108 #define AB8500_SYS_CHARGER_CONTROL_REG          0x52
109 #define EXTERNAL_CHARGER_DISABLE_REG_VAL        0x03
110 #define EXTERNAL_CHARGER_ENABLE_REG_VAL         0x07
111 
112 /* UsbLineStatus register - usb types */
113 enum ab8500_charger_link_status {
114         USB_STAT_NOT_CONFIGURED,
115         USB_STAT_STD_HOST_NC,
116         USB_STAT_STD_HOST_C_NS,
117         USB_STAT_STD_HOST_C_S,
118         USB_STAT_HOST_CHG_NM,
119         USB_STAT_HOST_CHG_HS,
120         USB_STAT_HOST_CHG_HS_CHIRP,
121         USB_STAT_DEDICATED_CHG,
122         USB_STAT_ACA_RID_A,
123         USB_STAT_ACA_RID_B,
124         USB_STAT_ACA_RID_C_NM,
125         USB_STAT_ACA_RID_C_HS,
126         USB_STAT_ACA_RID_C_HS_CHIRP,
127         USB_STAT_HM_IDGND,
128         USB_STAT_RESERVED,
129         USB_STAT_NOT_VALID_LINK,
130         USB_STAT_PHY_EN,
131         USB_STAT_SUP_NO_IDGND_VBUS,
132         USB_STAT_SUP_IDGND_VBUS,
133         USB_STAT_CHARGER_LINE_1,
134         USB_STAT_CARKIT_1,
135         USB_STAT_CARKIT_2,
136         USB_STAT_ACA_DOCK_CHARGER,
137 };
138 
139 enum ab8500_usb_state {
140         AB8500_BM_USB_STATE_RESET_HS,   /* HighSpeed Reset */
141         AB8500_BM_USB_STATE_RESET_FS,   /* FullSpeed/LowSpeed Reset */
142         AB8500_BM_USB_STATE_CONFIGURED,
143         AB8500_BM_USB_STATE_SUSPEND,
144         AB8500_BM_USB_STATE_RESUME,
145         AB8500_BM_USB_STATE_MAX,
146 };
147 
148 /* VBUS input current limits supported in AB8500 in mA */
149 #define USB_CH_IP_CUR_LVL_0P05          50
150 #define USB_CH_IP_CUR_LVL_0P09          98
151 #define USB_CH_IP_CUR_LVL_0P19          193
152 #define USB_CH_IP_CUR_LVL_0P29          290
153 #define USB_CH_IP_CUR_LVL_0P38          380
154 #define USB_CH_IP_CUR_LVL_0P45          450
155 #define USB_CH_IP_CUR_LVL_0P5           500
156 #define USB_CH_IP_CUR_LVL_0P6           600
157 #define USB_CH_IP_CUR_LVL_0P7           700
158 #define USB_CH_IP_CUR_LVL_0P8           800
159 #define USB_CH_IP_CUR_LVL_0P9           900
160 #define USB_CH_IP_CUR_LVL_1P0           1000
161 #define USB_CH_IP_CUR_LVL_1P1           1100
162 #define USB_CH_IP_CUR_LVL_1P3           1300
163 #define USB_CH_IP_CUR_LVL_1P4           1400
164 #define USB_CH_IP_CUR_LVL_1P5           1500
165 
166 #define VBAT_TRESH_IP_CUR_RED           3800
167 
168 #define to_ab8500_charger_usb_device_info(x) container_of((x), \
169         struct ab8500_charger, usb_chg)
170 #define to_ab8500_charger_ac_device_info(x) container_of((x), \
171         struct ab8500_charger, ac_chg)
172 
173 /**
174  * struct ab8500_charger_interrupts - ab8500 interupts
175  * @name:       name of the interrupt
176  * @isr         function pointer to the isr
177  */
178 struct ab8500_charger_interrupts {
179         char *name;
180         irqreturn_t (*isr)(int irq, void *data);
181 };
182 
183 struct ab8500_charger_info {
184         int charger_connected;
185         int charger_online;
186         int charger_voltage;
187         int cv_active;
188         bool wd_expired;
189         int charger_current;
190 };
191 
192 struct ab8500_charger_event_flags {
193         bool mainextchnotok;
194         bool main_thermal_prot;
195         bool usb_thermal_prot;
196         bool vbus_ovv;
197         bool usbchargernotok;
198         bool chgwdexp;
199         bool vbus_collapse;
200         bool vbus_drop_end;
201 };
202 
203 struct ab8500_charger_usb_state {
204         int usb_current;
205         int usb_current_tmp;
206         enum ab8500_usb_state state;
207         enum ab8500_usb_state state_tmp;
208         spinlock_t usb_lock;
209 };
210 
211 struct ab8500_charger_max_usb_in_curr {
212         int usb_type_max;
213         int set_max;
214         int calculated_max;
215 };
216 
217 /**
218  * struct ab8500_charger - ab8500 Charger device information
219  * @dev:                Pointer to the structure device
220  * @vbus_detected:      VBUS detected
221  * @vbus_detected_start:
222  *                      VBUS detected during startup
223  * @ac_conn:            This will be true when the AC charger has been plugged
224  * @vddadc_en_ac:       Indicate if VDD ADC supply is enabled because AC
225  *                      charger is enabled
226  * @vddadc_en_usb:      Indicate if VDD ADC supply is enabled because USB
227  *                      charger is enabled
228  * @vbat                Battery voltage
229  * @old_vbat            Previously measured battery voltage
230  * @usb_device_is_unrecognised  USB device is unrecognised by the hardware
231  * @autopower           Indicate if we should have automatic pwron after pwrloss
232  * @autopower_cfg       platform specific power config support for "pwron after pwrloss"
233  * @invalid_charger_detect_state State when forcing AB to use invalid charger
234  * @is_aca_rid:         Incicate if accessory is ACA type
235  * @current_stepping_sessions:
236  *                      Counter for current stepping sessions
237  * @parent:             Pointer to the struct ab8500
238  * @gpadc:              Pointer to the struct gpadc
239  * @bm:                 Platform specific battery management information
240  * @flags:              Structure for information about events triggered
241  * @usb_state:          Structure for usb stack information
242  * @max_usb_in_curr:    Max USB charger input current
243  * @ac_chg:             AC charger power supply
244  * @usb_chg:            USB charger power supply
245  * @ac:                 Structure that holds the AC charger properties
246  * @usb:                Structure that holds the USB charger properties
247  * @regu:               Pointer to the struct regulator
248  * @charger_wq:         Work queue for the IRQs and checking HW state
249  * @usb_ipt_crnt_lock:  Lock to protect VBUS input current setting from mutuals
250  * @pm_lock:            Lock to prevent system to suspend
251  * @check_vbat_work     Work for checking vbat threshold to adjust vbus current
252  * @check_hw_failure_work:      Work for checking HW state
253  * @check_usbchgnotok_work:     Work for checking USB charger not ok status
254  * @kick_wd_work:               Work for kicking the charger watchdog in case
255  *                              of ABB rev 1.* due to the watchog logic bug
256  * @ac_charger_attached_work:   Work for checking if AC charger is still
257  *                              connected
258  * @usb_charger_attached_work:  Work for checking if USB charger is still
259  *                              connected
260  * @ac_work:                    Work for checking AC charger connection
261  * @detect_usb_type_work:       Work for detecting the USB type connected
262  * @usb_link_status_work:       Work for checking the new USB link status
263  * @usb_state_changed_work:     Work for checking USB state
264  * @attach_work:                Work for detecting USB type
265  * @vbus_drop_end_work:         Work for detecting VBUS drop end
266  * @check_main_thermal_prot_work:
267  *                              Work for checking Main thermal status
268  * @check_usb_thermal_prot_work:
269  *                              Work for checking USB thermal status
270  * @charger_attached_mutex:     For controlling the wakelock
271  */
272 struct ab8500_charger {
273         struct device *dev;
274         bool vbus_detected;
275         bool vbus_detected_start;
276         bool ac_conn;
277         bool vddadc_en_ac;
278         bool vddadc_en_usb;
279         int vbat;
280         int old_vbat;
281         bool usb_device_is_unrecognised;
282         bool autopower;
283         bool autopower_cfg;
284         int invalid_charger_detect_state;
285         int is_aca_rid;
286         atomic_t current_stepping_sessions;
287         struct ab8500 *parent;
288         struct ab8500_gpadc *gpadc;
289         struct abx500_bm_data *bm;
290         struct ab8500_charger_event_flags flags;
291         struct ab8500_charger_usb_state usb_state;
292         struct ab8500_charger_max_usb_in_curr max_usb_in_curr;
293         struct ux500_charger ac_chg;
294         struct ux500_charger usb_chg;
295         struct ab8500_charger_info ac;
296         struct ab8500_charger_info usb;
297         struct regulator *regu;
298         struct workqueue_struct *charger_wq;
299         struct mutex usb_ipt_crnt_lock;
300         struct delayed_work check_vbat_work;
301         struct delayed_work check_hw_failure_work;
302         struct delayed_work check_usbchgnotok_work;
303         struct delayed_work kick_wd_work;
304         struct delayed_work usb_state_changed_work;
305         struct delayed_work attach_work;
306         struct delayed_work ac_charger_attached_work;
307         struct delayed_work usb_charger_attached_work;
308         struct delayed_work vbus_drop_end_work;
309         struct work_struct ac_work;
310         struct work_struct detect_usb_type_work;
311         struct work_struct usb_link_status_work;
312         struct work_struct check_main_thermal_prot_work;
313         struct work_struct check_usb_thermal_prot_work;
314         struct usb_phy *usb_phy;
315         struct notifier_block nb;
316         struct mutex charger_attached_mutex;
317 };
318 
319 /* AC properties */
320 static enum power_supply_property ab8500_charger_ac_props[] = {
321         POWER_SUPPLY_PROP_HEALTH,
322         POWER_SUPPLY_PROP_PRESENT,
323         POWER_SUPPLY_PROP_ONLINE,
324         POWER_SUPPLY_PROP_VOLTAGE_NOW,
325         POWER_SUPPLY_PROP_VOLTAGE_AVG,
326         POWER_SUPPLY_PROP_CURRENT_NOW,
327 };
328 
329 /* USB properties */
330 static enum power_supply_property ab8500_charger_usb_props[] = {
331         POWER_SUPPLY_PROP_HEALTH,
332         POWER_SUPPLY_PROP_CURRENT_AVG,
333         POWER_SUPPLY_PROP_PRESENT,
334         POWER_SUPPLY_PROP_ONLINE,
335         POWER_SUPPLY_PROP_VOLTAGE_NOW,
336         POWER_SUPPLY_PROP_VOLTAGE_AVG,
337         POWER_SUPPLY_PROP_CURRENT_NOW,
338 };
339 
340 /*
341  * Function for enabling and disabling sw fallback mode
342  * should always be disabled when no charger is connected.
343  */
344 static void ab8500_enable_disable_sw_fallback(struct ab8500_charger *di,
345                 bool fallback)
346 {
347         u8 val;
348         u8 reg;
349         u8 bank;
350         u8 bit;
351         int ret;
352 
353         dev_dbg(di->dev, "SW Fallback: %d\n", fallback);
354 
355         if (is_ab8500(di->parent)) {
356                 bank = 0x15;
357                 reg = 0x0;
358                 bit = 3;
359         } else {
360                 bank = AB8500_SYS_CTRL1_BLOCK;
361                 reg = AB8500_SW_CONTROL_FALLBACK;
362                 bit = 0;
363         }
364 
365         /* read the register containing fallback bit */
366         ret = abx500_get_register_interruptible(di->dev, bank, reg, &val);
367         if (ret < 0) {
368                 dev_err(di->dev, "%d read failed\n", __LINE__);
369                 return;
370         }
371 
372         if (is_ab8500(di->parent)) {
373                 /* enable the OPT emulation registers */
374                 ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x2);
375                 if (ret) {
376                         dev_err(di->dev, "%d write failed\n", __LINE__);
377                         goto disable_otp;
378                 }
379         }
380 
381         if (fallback)
382                 val |= (1 << bit);
383         else
384                 val &= ~(1 << bit);
385 
386         /* write back the changed fallback bit value to register */
387         ret = abx500_set_register_interruptible(di->dev, bank, reg, val);
388         if (ret) {
389                 dev_err(di->dev, "%d write failed\n", __LINE__);
390         }
391 
392 disable_otp:
393         if (is_ab8500(di->parent)) {
394                 /* disable the set OTP registers again */
395                 ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x0);
396                 if (ret) {
397                         dev_err(di->dev, "%d write failed\n", __LINE__);
398                 }
399         }
400 }
401 
402 /**
403  * ab8500_power_supply_changed - a wrapper with local extentions for
404  * power_supply_changed
405  * @di:   pointer to the ab8500_charger structure
406  * @psy:  pointer to power_supply_that have changed.
407  *
408  */
409 static void ab8500_power_supply_changed(struct ab8500_charger *di,
410                                         struct power_supply *psy)
411 {
412         if (di->autopower_cfg) {
413                 if (!di->usb.charger_connected &&
414                     !di->ac.charger_connected &&
415                     di->autopower) {
416                         di->autopower = false;
417                         ab8500_enable_disable_sw_fallback(di, false);
418                 } else if (!di->autopower &&
419                            (di->ac.charger_connected ||
420                             di->usb.charger_connected)) {
421                         di->autopower = true;
422                         ab8500_enable_disable_sw_fallback(di, true);
423                 }
424         }
425         power_supply_changed(psy);
426 }
427 
428 static void ab8500_charger_set_usb_connected(struct ab8500_charger *di,
429         bool connected)
430 {
431         if (connected != di->usb.charger_connected) {
432                 dev_dbg(di->dev, "USB connected:%i\n", connected);
433                 di->usb.charger_connected = connected;
434 
435                 if (!connected)
436                         di->flags.vbus_drop_end = false;
437 
438                 sysfs_notify(&di->usb_chg.psy.dev->kobj, NULL, "present");
439 
440                 if (connected) {
441                         mutex_lock(&di->charger_attached_mutex);
442                         mutex_unlock(&di->charger_attached_mutex);
443 
444                         if (is_ab8500(di->parent))
445                                 queue_delayed_work(di->charger_wq,
446                                            &di->usb_charger_attached_work,
447                                            HZ);
448                 } else {
449                         cancel_delayed_work_sync(&di->usb_charger_attached_work);
450                         mutex_lock(&di->charger_attached_mutex);
451                         mutex_unlock(&di->charger_attached_mutex);
452                 }
453         }
454 }
455 
456 /**
457  * ab8500_charger_get_ac_voltage() - get ac charger voltage
458  * @di:         pointer to the ab8500_charger structure
459  *
460  * Returns ac charger voltage (on success)
461  */
462 static int ab8500_charger_get_ac_voltage(struct ab8500_charger *di)
463 {
464         int vch;
465 
466         /* Only measure voltage if the charger is connected */
467         if (di->ac.charger_connected) {
468                 vch = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_V);
469                 if (vch < 0)
470                         dev_err(di->dev, "%s gpadc conv failed,\n", __func__);
471         } else {
472                 vch = 0;
473         }
474         return vch;
475 }
476 
477 /**
478  * ab8500_charger_ac_cv() - check if the main charger is in CV mode
479  * @di:         pointer to the ab8500_charger structure
480  *
481  * Returns ac charger CV mode (on success) else error code
482  */
483 static int ab8500_charger_ac_cv(struct ab8500_charger *di)
484 {
485         u8 val;
486         int ret = 0;
487 
488         /* Only check CV mode if the charger is online */
489         if (di->ac.charger_online) {
490                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
491                         AB8500_CH_STATUS1_REG, &val);
492                 if (ret < 0) {
493                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
494                         return 0;
495                 }
496 
497                 if (val & MAIN_CH_CV_ON)
498                         ret = 1;
499                 else
500                         ret = 0;
501         }
502 
503         return ret;
504 }
505 
506 /**
507  * ab8500_charger_get_vbus_voltage() - get vbus voltage
508  * @di:         pointer to the ab8500_charger structure
509  *
510  * This function returns the vbus voltage.
511  * Returns vbus voltage (on success)
512  */
513 static int ab8500_charger_get_vbus_voltage(struct ab8500_charger *di)
514 {
515         int vch;
516 
517         /* Only measure voltage if the charger is connected */
518         if (di->usb.charger_connected) {
519                 vch = ab8500_gpadc_convert(di->gpadc, VBUS_V);
520                 if (vch < 0)
521                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
522         } else {
523                 vch = 0;
524         }
525         return vch;
526 }
527 
528 /**
529  * ab8500_charger_get_usb_current() - get usb charger current
530  * @di:         pointer to the ab8500_charger structure
531  *
532  * This function returns the usb charger current.
533  * Returns usb current (on success) and error code on failure
534  */
535 static int ab8500_charger_get_usb_current(struct ab8500_charger *di)
536 {
537         int ich;
538 
539         /* Only measure current if the charger is online */
540         if (di->usb.charger_online) {
541                 ich = ab8500_gpadc_convert(di->gpadc, USB_CHARGER_C);
542                 if (ich < 0)
543                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
544         } else {
545                 ich = 0;
546         }
547         return ich;
548 }
549 
550 /**
551  * ab8500_charger_get_ac_current() - get ac charger current
552  * @di:         pointer to the ab8500_charger structure
553  *
554  * This function returns the ac charger current.
555  * Returns ac current (on success) and error code on failure.
556  */
557 static int ab8500_charger_get_ac_current(struct ab8500_charger *di)
558 {
559         int ich;
560 
561         /* Only measure current if the charger is online */
562         if (di->ac.charger_online) {
563                 ich = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_C);
564                 if (ich < 0)
565                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
566         } else {
567                 ich = 0;
568         }
569         return ich;
570 }
571 
572 /**
573  * ab8500_charger_usb_cv() - check if the usb charger is in CV mode
574  * @di:         pointer to the ab8500_charger structure
575  *
576  * Returns ac charger CV mode (on success) else error code
577  */
578 static int ab8500_charger_usb_cv(struct ab8500_charger *di)
579 {
580         int ret;
581         u8 val;
582 
583         /* Only check CV mode if the charger is online */
584         if (di->usb.charger_online) {
585                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
586                         AB8500_CH_USBCH_STAT1_REG, &val);
587                 if (ret < 0) {
588                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
589                         return 0;
590                 }
591 
592                 if (val & USB_CH_CV_ON)
593                         ret = 1;
594                 else
595                         ret = 0;
596         } else {
597                 ret = 0;
598         }
599 
600         return ret;
601 }
602 
603 /**
604  * ab8500_charger_detect_chargers() - Detect the connected chargers
605  * @di:         pointer to the ab8500_charger structure
606  * @probe:      if probe, don't delay and wait for HW
607  *
608  * Returns the type of charger connected.
609  * For USB it will not mean we can actually charge from it
610  * but that there is a USB cable connected that we have to
611  * identify. This is used during startup when we don't get
612  * interrupts of the charger detection
613  *
614  * Returns an integer value, that means,
615  * NO_PW_CONN  no power supply is connected
616  * AC_PW_CONN  if the AC power supply is connected
617  * USB_PW_CONN  if the USB power supply is connected
618  * AC_PW_CONN + USB_PW_CONN if USB and AC power supplies are both connected
619  */
620 static int ab8500_charger_detect_chargers(struct ab8500_charger *di, bool probe)
621 {
622         int result = NO_PW_CONN;
623         int ret;
624         u8 val;
625 
626         /* Check for AC charger */
627         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
628                 AB8500_CH_STATUS1_REG, &val);
629         if (ret < 0) {
630                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
631                 return ret;
632         }
633 
634         if (val & MAIN_CH_DET)
635                 result = AC_PW_CONN;
636 
637         /* Check for USB charger */
638 
639         if (!probe) {
640                 /*
641                  * AB8500 says VBUS_DET_DBNC1 & VBUS_DET_DBNC100
642                  * when disconnecting ACA even though no
643                  * charger was connected. Try waiting a little
644                  * longer than the 100 ms of VBUS_DET_DBNC100...
645                  */
646                 msleep(110);
647         }
648         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
649                 AB8500_CH_USBCH_STAT1_REG, &val);
650         if (ret < 0) {
651                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
652                 return ret;
653         }
654         dev_dbg(di->dev,
655                 "%s AB8500_CH_USBCH_STAT1_REG %x\n", __func__,
656                 val);
657         if ((val & VBUS_DET_DBNC1) && (val & VBUS_DET_DBNC100))
658                 result |= USB_PW_CONN;
659 
660         return result;
661 }
662 
663 /**
664  * ab8500_charger_max_usb_curr() - get the max curr for the USB type
665  * @di:                 pointer to the ab8500_charger structure
666  * @link_status:        the identified USB type
667  *
668  * Get the maximum current that is allowed to be drawn from the host
669  * based on the USB type.
670  * Returns error code in case of failure else 0 on success
671  */
672 static int ab8500_charger_max_usb_curr(struct ab8500_charger *di,
673                 enum ab8500_charger_link_status link_status)
674 {
675         int ret = 0;
676 
677         di->usb_device_is_unrecognised = false;
678 
679         /*
680          * Platform only supports USB 2.0.
681          * This means that charging current from USB source
682          * is maximum 500 mA. Every occurence of USB_STAT_*_HOST_*
683          * should set USB_CH_IP_CUR_LVL_0P5.
684          */
685 
686         switch (link_status) {
687         case USB_STAT_STD_HOST_NC:
688         case USB_STAT_STD_HOST_C_NS:
689         case USB_STAT_STD_HOST_C_S:
690                 dev_dbg(di->dev, "USB Type - Standard host is "
691                         "detected through USB driver\n");
692                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
693                 di->is_aca_rid = 0;
694                 break;
695         case USB_STAT_HOST_CHG_HS_CHIRP:
696                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
697                 di->is_aca_rid = 0;
698                 break;
699         case USB_STAT_HOST_CHG_HS:
700                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
701                 di->is_aca_rid = 0;
702                 break;
703         case USB_STAT_ACA_RID_C_HS:
704                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P9;
705                 di->is_aca_rid = 0;
706                 break;
707         case USB_STAT_ACA_RID_A:
708                 /*
709                  * Dedicated charger level minus maximum current accessory
710                  * can consume (900mA). Closest level is 500mA
711                  */
712                 dev_dbg(di->dev, "USB_STAT_ACA_RID_A detected\n");
713                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
714                 di->is_aca_rid = 1;
715                 break;
716         case USB_STAT_ACA_RID_B:
717                 /*
718                  * Dedicated charger level minus 120mA (20mA for ACA and
719                  * 100mA for potential accessory). Closest level is 1300mA
720                  */
721                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P3;
722                 dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
723                                 di->max_usb_in_curr.usb_type_max);
724                 di->is_aca_rid = 1;
725                 break;
726         case USB_STAT_HOST_CHG_NM:
727                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
728                 di->is_aca_rid = 0;
729                 break;
730         case USB_STAT_DEDICATED_CHG:
731                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P5;
732                 di->is_aca_rid = 0;
733                 break;
734         case USB_STAT_ACA_RID_C_HS_CHIRP:
735         case USB_STAT_ACA_RID_C_NM:
736                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P5;
737                 di->is_aca_rid = 1;
738                 break;
739         case USB_STAT_NOT_CONFIGURED:
740                 if (di->vbus_detected) {
741                         di->usb_device_is_unrecognised = true;
742                         dev_dbg(di->dev, "USB Type - Legacy charger.\n");
743                         di->max_usb_in_curr.usb_type_max =
744                                                 USB_CH_IP_CUR_LVL_1P5;
745                         break;
746                 }
747         case USB_STAT_HM_IDGND:
748                 dev_err(di->dev, "USB Type - Charging not allowed\n");
749                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
750                 ret = -ENXIO;
751                 break;
752         case USB_STAT_RESERVED:
753                 if (is_ab8500(di->parent)) {
754                         di->flags.vbus_collapse = true;
755                         dev_err(di->dev, "USB Type - USB_STAT_RESERVED "
756                                                 "VBUS has collapsed\n");
757                         ret = -ENXIO;
758                         break;
759                 } else {
760                         dev_dbg(di->dev, "USB Type - Charging not allowed\n");
761                         di->max_usb_in_curr.usb_type_max =
762                                                 USB_CH_IP_CUR_LVL_0P05;
763                         dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
764                                 link_status,
765                                 di->max_usb_in_curr.usb_type_max);
766                         ret = -ENXIO;
767                         break;
768                 }
769         case USB_STAT_CARKIT_1:
770         case USB_STAT_CARKIT_2:
771         case USB_STAT_ACA_DOCK_CHARGER:
772         case USB_STAT_CHARGER_LINE_1:
773                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
774                 dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
775                                 di->max_usb_in_curr.usb_type_max);
776                 break;
777         case USB_STAT_NOT_VALID_LINK:
778                 dev_err(di->dev, "USB Type invalid - try charging anyway\n");
779                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
780                 break;
781 
782         default:
783                 dev_err(di->dev, "USB Type - Unknown\n");
784                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
785                 ret = -ENXIO;
786                 break;
787         };
788 
789         di->max_usb_in_curr.set_max = di->max_usb_in_curr.usb_type_max;
790         dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
791                 link_status, di->max_usb_in_curr.set_max);
792 
793         return ret;
794 }
795 
796 /**
797  * ab8500_charger_read_usb_type() - read the type of usb connected
798  * @di:         pointer to the ab8500_charger structure
799  *
800  * Detect the type of the plugged USB
801  * Returns error code in case of failure else 0 on success
802  */
803 static int ab8500_charger_read_usb_type(struct ab8500_charger *di)
804 {
805         int ret;
806         u8 val;
807 
808         ret = abx500_get_register_interruptible(di->dev,
809                 AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG, &val);
810         if (ret < 0) {
811                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
812                 return ret;
813         }
814         if (is_ab8500(di->parent))
815                 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
816                         AB8500_USB_LINE_STAT_REG, &val);
817         else
818                 ret = abx500_get_register_interruptible(di->dev,
819                         AB8500_USB, AB8500_USB_LINK1_STAT_REG, &val);
820         if (ret < 0) {
821                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
822                 return ret;
823         }
824 
825         /* get the USB type */
826         if (is_ab8500(di->parent))
827                 val = (val & AB8500_USB_LINK_STATUS) >> USB_LINK_STATUS_SHIFT;
828         else
829                 val = (val & AB8505_USB_LINK_STATUS) >> USB_LINK_STATUS_SHIFT;
830         ret = ab8500_charger_max_usb_curr(di,
831                 (enum ab8500_charger_link_status) val);
832 
833         return ret;
834 }
835 
836 /**
837  * ab8500_charger_detect_usb_type() - get the type of usb connected
838  * @di:         pointer to the ab8500_charger structure
839  *
840  * Detect the type of the plugged USB
841  * Returns error code in case of failure else 0 on success
842  */
843 static int ab8500_charger_detect_usb_type(struct ab8500_charger *di)
844 {
845         int i, ret;
846         u8 val;
847 
848         /*
849          * On getting the VBUS rising edge detect interrupt there
850          * is a 250ms delay after which the register UsbLineStatus
851          * is filled with valid data.
852          */
853         for (i = 0; i < 10; i++) {
854                 msleep(250);
855                 ret = abx500_get_register_interruptible(di->dev,
856                         AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG,
857                         &val);
858                 dev_dbg(di->dev, "%s AB8500_IT_SOURCE21_REG %x\n",
859                         __func__, val);
860                 if (ret < 0) {
861                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
862                         return ret;
863                 }
864 
865                 if (is_ab8500(di->parent))
866                         ret = abx500_get_register_interruptible(di->dev,
867                                 AB8500_USB, AB8500_USB_LINE_STAT_REG, &val);
868                 else
869                         ret = abx500_get_register_interruptible(di->dev,
870                                 AB8500_USB, AB8500_USB_LINK1_STAT_REG, &val);
871                 if (ret < 0) {
872                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
873                         return ret;
874                 }
875                 dev_dbg(di->dev, "%s AB8500_USB_LINE_STAT_REG %x\n", __func__,
876                         val);
877                 /*
878                  * Until the IT source register is read the UsbLineStatus
879                  * register is not updated, hence doing the same
880                  * Revisit this:
881                  */
882 
883                 /* get the USB type */
884                 if (is_ab8500(di->parent))
885                         val = (val & AB8500_USB_LINK_STATUS) >>
886                                                         USB_LINK_STATUS_SHIFT;
887                 else
888                         val = (val & AB8505_USB_LINK_STATUS) >>
889                                                         USB_LINK_STATUS_SHIFT;
890                 if (val)
891                         break;
892         }
893         ret = ab8500_charger_max_usb_curr(di,
894                 (enum ab8500_charger_link_status) val);
895 
896         return ret;
897 }
898 
899 /*
900  * This array maps the raw hex value to charger voltage used by the AB8500
901  * Values taken from the UM0836
902  */
903 static int ab8500_charger_voltage_map[] = {
904         3500 ,
905         3525 ,
906         3550 ,
907         3575 ,
908         3600 ,
909         3625 ,
910         3650 ,
911         3675 ,
912         3700 ,
913         3725 ,
914         3750 ,
915         3775 ,
916         3800 ,
917         3825 ,
918         3850 ,
919         3875 ,
920         3900 ,
921         3925 ,
922         3950 ,
923         3975 ,
924         4000 ,
925         4025 ,
926         4050 ,
927         4060 ,
928         4070 ,
929         4080 ,
930         4090 ,
931         4100 ,
932         4110 ,
933         4120 ,
934         4130 ,
935         4140 ,
936         4150 ,
937         4160 ,
938         4170 ,
939         4180 ,
940         4190 ,
941         4200 ,
942         4210 ,
943         4220 ,
944         4230 ,
945         4240 ,
946         4250 ,
947         4260 ,
948         4270 ,
949         4280 ,
950         4290 ,
951         4300 ,
952         4310 ,
953         4320 ,
954         4330 ,
955         4340 ,
956         4350 ,
957         4360 ,
958         4370 ,
959         4380 ,
960         4390 ,
961         4400 ,
962         4410 ,
963         4420 ,
964         4430 ,
965         4440 ,
966         4450 ,
967         4460 ,
968         4470 ,
969         4480 ,
970         4490 ,
971         4500 ,
972         4510 ,
973         4520 ,
974         4530 ,
975         4540 ,
976         4550 ,
977         4560 ,
978         4570 ,
979         4580 ,
980         4590 ,
981         4600 ,
982 };
983 
984 static int ab8500_voltage_to_regval(int voltage)
985 {
986         int i;
987 
988         /* Special case for voltage below 3.5V */
989         if (voltage < ab8500_charger_voltage_map[0])
990                 return LOW_VOLT_REG;
991 
992         for (i = 1; i < ARRAY_SIZE(ab8500_charger_voltage_map); i++) {
993                 if (voltage < ab8500_charger_voltage_map[i])
994                         return i - 1;
995         }
996 
997         /* If not last element, return error */
998         i = ARRAY_SIZE(ab8500_charger_voltage_map) - 1;
999         if (voltage == ab8500_charger_voltage_map[i])
1000                 return i;
1001         else
1002                 return -1;
1003 }
1004 
1005 static int ab8500_current_to_regval(struct ab8500_charger *di, int curr)
1006 {
1007         int i;
1008 
1009         if (curr < di->bm->chg_output_curr[0])
1010                 return 0;
1011 
1012         for (i = 0; i < di->bm->n_chg_out_curr; i++) {
1013                 if (curr < di->bm->chg_output_curr[i])
1014                         return i - 1;
1015         }
1016 
1017         /* If not last element, return error */
1018         i = di->bm->n_chg_out_curr - 1;
1019         if (curr == di->bm->chg_output_curr[i])
1020                 return i;
1021         else
1022                 return -1;
1023 }
1024 
1025 static int ab8500_vbus_in_curr_to_regval(struct ab8500_charger *di, int curr)
1026 {
1027         int i;
1028 
1029         if (curr < di->bm->chg_input_curr[0])
1030                 return 0;
1031 
1032         for (i = 0; i < di->bm->n_chg_in_curr; i++) {
1033                 if (curr < di->bm->chg_input_curr[i])
1034                         return i - 1;
1035         }
1036 
1037         /* If not last element, return error */
1038         i = di->bm->n_chg_in_curr - 1;
1039         if (curr == di->bm->chg_input_curr[i])
1040                 return i;
1041         else
1042                 return -1;
1043 }
1044 
1045 /**
1046  * ab8500_charger_get_usb_cur() - get usb current
1047  * @di:         pointer to the ab8500_charger structre
1048  *
1049  * The usb stack provides the maximum current that can be drawn from
1050  * the standard usb host. This will be in mA.
1051  * This function converts current in mA to a value that can be written
1052  * to the register. Returns -1 if charging is not allowed
1053  */
1054 static int ab8500_charger_get_usb_cur(struct ab8500_charger *di)
1055 {
1056         int ret = 0;
1057         switch (di->usb_state.usb_current) {
1058         case 100:
1059                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P09;
1060                 break;
1061         case 200:
1062                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P19;
1063                 break;
1064         case 300:
1065                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P29;
1066                 break;
1067         case 400:
1068                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P38;
1069                 break;
1070         case 500:
1071                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
1072                 break;
1073         default:
1074                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
1075                 ret = -EPERM;
1076                 break;
1077         };
1078         di->max_usb_in_curr.set_max = di->max_usb_in_curr.usb_type_max;
1079         return ret;
1080 }
1081 
1082 /**
1083  * ab8500_charger_check_continue_stepping() - Check to allow stepping
1084  * @di:         pointer to the ab8500_charger structure
1085  * @reg:        select what charger register to check
1086  *
1087  * Check if current stepping should be allowed to continue.
1088  * Checks if charger source has not collapsed. If it has, further stepping
1089  * is not allowed.
1090  */
1091 static bool ab8500_charger_check_continue_stepping(struct ab8500_charger *di,
1092                                                    int reg)
1093 {
1094         if (reg == AB8500_USBCH_IPT_CRNTLVL_REG)
1095                 return !di->flags.vbus_drop_end;
1096         else
1097                 return true;
1098 }
1099 
1100 /**
1101  * ab8500_charger_set_current() - set charger current
1102  * @di:         pointer to the ab8500_charger structure
1103  * @ich:        charger current, in mA
1104  * @reg:        select what charger register to set
1105  *
1106  * Set charger current.
1107  * There is no state machine in the AB to step up/down the charger
1108  * current to avoid dips and spikes on MAIN, VBUS and VBAT when
1109  * charging is started. Instead we need to implement
1110  * this charger current step-up/down here.
1111  * Returns error code in case of failure else 0(on success)
1112  */
1113 static int ab8500_charger_set_current(struct ab8500_charger *di,
1114         int ich, int reg)
1115 {
1116         int ret = 0;
1117         int curr_index, prev_curr_index, shift_value, i;
1118         u8 reg_value;
1119         u32 step_udelay;
1120         bool no_stepping = false;
1121 
1122         atomic_inc(&di->current_stepping_sessions);
1123 
1124         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1125                 reg, &reg_value);
1126         if (ret < 0) {
1127                 dev_err(di->dev, "%s read failed\n", __func__);
1128                 goto exit_set_current;
1129         }
1130 
1131         switch (reg) {
1132         case AB8500_MCH_IPT_CURLVL_REG:
1133                 shift_value = MAIN_CH_INPUT_CURR_SHIFT;
1134                 prev_curr_index = (reg_value >> shift_value);
1135                 curr_index = ab8500_current_to_regval(di, ich);
1136                 step_udelay = STEP_UDELAY;
1137                 if (!di->ac.charger_connected)
1138                         no_stepping = true;
1139                 break;
1140         case AB8500_USBCH_IPT_CRNTLVL_REG:
1141                 if (is_ab8540(di->parent))
1142                         shift_value = AB8540_VBUS_IN_CURR_LIM_SHIFT;
1143                 else
1144                         shift_value = VBUS_IN_CURR_LIM_SHIFT;
1145                 prev_curr_index = (reg_value >> shift_value);
1146                 curr_index = ab8500_vbus_in_curr_to_regval(di, ich);
1147                 step_udelay = STEP_UDELAY * 100;
1148 
1149                 if (!di->usb.charger_connected)
1150                         no_stepping = true;
1151                 break;
1152         case AB8500_CH_OPT_CRNTLVL_REG:
1153                 shift_value = 0;
1154                 prev_curr_index = (reg_value >> shift_value);
1155                 curr_index = ab8500_current_to_regval(di, ich);
1156                 step_udelay = STEP_UDELAY;
1157                 if (curr_index && (curr_index - prev_curr_index) > 1)
1158                         step_udelay *= 100;
1159 
1160                 if (!di->usb.charger_connected && !di->ac.charger_connected)
1161                         no_stepping = true;
1162 
1163                 break;
1164         default:
1165                 dev_err(di->dev, "%s current register not valid\n", __func__);
1166                 ret = -ENXIO;
1167                 goto exit_set_current;
1168         }
1169 
1170         if (curr_index < 0) {
1171                 dev_err(di->dev, "requested current limit out-of-range\n");
1172                 ret = -ENXIO;
1173                 goto exit_set_current;
1174         }
1175 
1176         /* only update current if it's been changed */
1177         if (prev_curr_index == curr_index) {
1178                 dev_dbg(di->dev, "%s current not changed for reg: 0x%02x\n",
1179                         __func__, reg);
1180                 ret = 0;
1181                 goto exit_set_current;
1182         }
1183 
1184         dev_dbg(di->dev, "%s set charger current: %d mA for reg: 0x%02x\n",
1185                 __func__, ich, reg);
1186 
1187         if (no_stepping) {
1188                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1189                                         reg, (u8)curr_index << shift_value);
1190                 if (ret)
1191                         dev_err(di->dev, "%s write failed\n", __func__);
1192         } else if (prev_curr_index > curr_index) {
1193                 for (i = prev_curr_index - 1; i >= curr_index; i--) {
1194                         dev_dbg(di->dev, "curr change_1 to: %x for 0x%02x\n",
1195                                 (u8) i << shift_value, reg);
1196                         ret = abx500_set_register_interruptible(di->dev,
1197                                 AB8500_CHARGER, reg, (u8)i << shift_value);
1198                         if (ret) {
1199                                 dev_err(di->dev, "%s write failed\n", __func__);
1200                                 goto exit_set_current;
1201                         }
1202                         if (i != curr_index)
1203                                 usleep_range(step_udelay, step_udelay * 2);
1204                 }
1205         } else {
1206                 bool allow = true;
1207                 for (i = prev_curr_index + 1; i <= curr_index && allow; i++) {
1208                         dev_dbg(di->dev, "curr change_2 to: %x for 0x%02x\n",
1209                                 (u8)i << shift_value, reg);
1210                         ret = abx500_set_register_interruptible(di->dev,
1211                                 AB8500_CHARGER, reg, (u8)i << shift_value);
1212                         if (ret) {
1213                                 dev_err(di->dev, "%s write failed\n", __func__);
1214                                 goto exit_set_current;
1215                         }
1216                         if (i != curr_index)
1217                                 usleep_range(step_udelay, step_udelay * 2);
1218 
1219                         allow = ab8500_charger_check_continue_stepping(di, reg);
1220                 }
1221         }
1222 
1223 exit_set_current:
1224         atomic_dec(&di->current_stepping_sessions);
1225 
1226         return ret;
1227 }
1228 
1229 /**
1230  * ab8500_charger_set_vbus_in_curr() - set VBUS input current limit
1231  * @di:         pointer to the ab8500_charger structure
1232  * @ich_in:     charger input current limit
1233  *
1234  * Sets the current that can be drawn from the USB host
1235  * Returns error code in case of failure else 0(on success)
1236  */
1237 static int ab8500_charger_set_vbus_in_curr(struct ab8500_charger *di,
1238                 int ich_in)
1239 {
1240         int min_value;
1241         int ret;
1242 
1243         /* We should always use to lowest current limit */
1244         min_value = min(di->bm->chg_params->usb_curr_max, ich_in);
1245         if (di->max_usb_in_curr.set_max > 0)
1246                 min_value = min(di->max_usb_in_curr.set_max, min_value);
1247 
1248         if (di->usb_state.usb_current >= 0)
1249                 min_value = min(di->usb_state.usb_current, min_value);
1250 
1251         switch (min_value) {
1252         case 100:
1253                 if (di->vbat < VBAT_TRESH_IP_CUR_RED)
1254                         min_value = USB_CH_IP_CUR_LVL_0P05;
1255                 break;
1256         case 500:
1257                 if (di->vbat < VBAT_TRESH_IP_CUR_RED)
1258                         min_value = USB_CH_IP_CUR_LVL_0P45;
1259                 break;
1260         default:
1261                 break;
1262         }
1263 
1264         dev_info(di->dev, "VBUS input current limit set to %d mA\n", min_value);
1265 
1266         mutex_lock(&di->usb_ipt_crnt_lock);
1267         ret = ab8500_charger_set_current(di, min_value,
1268                 AB8500_USBCH_IPT_CRNTLVL_REG);
1269         mutex_unlock(&di->usb_ipt_crnt_lock);
1270 
1271         return ret;
1272 }
1273 
1274 /**
1275  * ab8500_charger_set_main_in_curr() - set main charger input current
1276  * @di:         pointer to the ab8500_charger structure
1277  * @ich_in:     input charger current, in mA
1278  *
1279  * Set main charger input current.
1280  * Returns error code in case of failure else 0(on success)
1281  */
1282 static int ab8500_charger_set_main_in_curr(struct ab8500_charger *di,
1283         int ich_in)
1284 {
1285         return ab8500_charger_set_current(di, ich_in,
1286                 AB8500_MCH_IPT_CURLVL_REG);
1287 }
1288 
1289 /**
1290  * ab8500_charger_set_output_curr() - set charger output current
1291  * @di:         pointer to the ab8500_charger structure
1292  * @ich_out:    output charger current, in mA
1293  *
1294  * Set charger output current.
1295  * Returns error code in case of failure else 0(on success)
1296  */
1297 static int ab8500_charger_set_output_curr(struct ab8500_charger *di,
1298         int ich_out)
1299 {
1300         return ab8500_charger_set_current(di, ich_out,
1301                 AB8500_CH_OPT_CRNTLVL_REG);
1302 }
1303 
1304 /**
1305  * ab8500_charger_led_en() - turn on/off chargign led
1306  * @di:         pointer to the ab8500_charger structure
1307  * @on:         flag to turn on/off the chargign led
1308  *
1309  * Power ON/OFF charging LED indication
1310  * Returns error code in case of failure else 0(on success)
1311  */
1312 static int ab8500_charger_led_en(struct ab8500_charger *di, int on)
1313 {
1314         int ret;
1315 
1316         if (on) {
1317                 /* Power ON charging LED indicator, set LED current to 5mA */
1318                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1319                         AB8500_LED_INDICATOR_PWM_CTRL,
1320                         (LED_IND_CUR_5MA | LED_INDICATOR_PWM_ENA));
1321                 if (ret) {
1322                         dev_err(di->dev, "Power ON LED failed\n");
1323                         return ret;
1324                 }
1325                 /* LED indicator PWM duty cycle 252/256 */
1326                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1327                         AB8500_LED_INDICATOR_PWM_DUTY,
1328                         LED_INDICATOR_PWM_DUTY_252_256);
1329                 if (ret) {
1330                         dev_err(di->dev, "Set LED PWM duty cycle failed\n");
1331                         return ret;
1332                 }
1333         } else {
1334                 /* Power off charging LED indicator */
1335                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1336                         AB8500_LED_INDICATOR_PWM_CTRL,
1337                         LED_INDICATOR_PWM_DIS);
1338                 if (ret) {
1339                         dev_err(di->dev, "Power-off LED failed\n");
1340                         return ret;
1341                 }
1342         }
1343 
1344         return ret;
1345 }
1346 
1347 /**
1348  * ab8500_charger_ac_en() - enable or disable ac charging
1349  * @di:         pointer to the ab8500_charger structure
1350  * @enable:     enable/disable flag
1351  * @vset:       charging voltage
1352  * @iset:       charging current
1353  *
1354  * Enable/Disable AC/Mains charging and turns on/off the charging led
1355  * respectively.
1356  **/
1357 static int ab8500_charger_ac_en(struct ux500_charger *charger,
1358         int enable, int vset, int iset)
1359 {
1360         int ret;
1361         int volt_index;
1362         int curr_index;
1363         int input_curr_index;
1364         u8 overshoot = 0;
1365 
1366         struct ab8500_charger *di = to_ab8500_charger_ac_device_info(charger);
1367 
1368         if (enable) {
1369                 /* Check if AC is connected */
1370                 if (!di->ac.charger_connected) {
1371                         dev_err(di->dev, "AC charger not connected\n");
1372                         return -ENXIO;
1373                 }
1374 
1375                 /* Enable AC charging */
1376                 dev_dbg(di->dev, "Enable AC: %dmV %dmA\n", vset, iset);
1377 
1378                 /*
1379                  * Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
1380                  * will be triggered everytime we enable the VDD ADC supply.
1381                  * This will turn off charging for a short while.
1382                  * It can be avoided by having the supply on when
1383                  * there is a charger enabled. Normally the VDD ADC supply
1384                  * is enabled everytime a GPADC conversion is triggered. We will
1385                  * force it to be enabled from this driver to have
1386                  * the GPADC module independant of the AB8500 chargers
1387                  */
1388                 if (!di->vddadc_en_ac) {
1389                         ret = regulator_enable(di->regu);
1390                         if (ret)
1391                                 dev_warn(di->dev,
1392                                         "Failed to enable regulator\n");
1393                         else
1394                                 di->vddadc_en_ac = true;
1395                 }
1396 
1397                 /* Check if the requested voltage or current is valid */
1398                 volt_index = ab8500_voltage_to_regval(vset);
1399                 curr_index = ab8500_current_to_regval(di, iset);
1400                 input_curr_index = ab8500_current_to_regval(di,
1401                         di->bm->chg_params->ac_curr_max);
1402                 if (volt_index < 0 || curr_index < 0 || input_curr_index < 0) {
1403                         dev_err(di->dev,
1404                                 "Charger voltage or current too high, "
1405                                 "charging not started\n");
1406                         return -ENXIO;
1407                 }
1408 
1409                 /* ChVoltLevel: maximum battery charging voltage */
1410                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1411                         AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
1412                 if (ret) {
1413                         dev_err(di->dev, "%s write failed\n", __func__);
1414                         return ret;
1415                 }
1416                 /* MainChInputCurr: current that can be drawn from the charger*/
1417                 ret = ab8500_charger_set_main_in_curr(di,
1418                         di->bm->chg_params->ac_curr_max);
1419                 if (ret) {
1420                         dev_err(di->dev, "%s Failed to set MainChInputCurr\n",
1421                                 __func__);
1422                         return ret;
1423                 }
1424                 /* ChOutputCurentLevel: protected output current */
1425                 ret = ab8500_charger_set_output_curr(di, iset);
1426                 if (ret) {
1427                         dev_err(di->dev, "%s "
1428                                 "Failed to set ChOutputCurentLevel\n",
1429                                 __func__);
1430                         return ret;
1431                 }
1432 
1433                 /* Check if VBAT overshoot control should be enabled */
1434                 if (!di->bm->enable_overshoot)
1435                         overshoot = MAIN_CH_NO_OVERSHOOT_ENA_N;
1436 
1437                 /* Enable Main Charger */
1438                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1439                         AB8500_MCH_CTRL1, MAIN_CH_ENA | overshoot);
1440                 if (ret) {
1441                         dev_err(di->dev, "%s write failed\n", __func__);
1442                         return ret;
1443                 }
1444 
1445                 /* Power on charging LED indication */
1446                 ret = ab8500_charger_led_en(di, true);
1447                 if (ret < 0)
1448                         dev_err(di->dev, "failed to enable LED\n");
1449 
1450                 di->ac.charger_online = 1;
1451         } else {
1452                 /* Disable AC charging */
1453                 if (is_ab8500_1p1_or_earlier(di->parent)) {
1454                         /*
1455                          * For ABB revision 1.0 and 1.1 there is a bug in the
1456                          * watchdog logic. That means we have to continously
1457                          * kick the charger watchdog even when no charger is
1458                          * connected. This is only valid once the AC charger
1459                          * has been enabled. This is a bug that is not handled
1460                          * by the algorithm and the watchdog have to be kicked
1461                          * by the charger driver when the AC charger
1462                          * is disabled
1463                          */
1464                         if (di->ac_conn) {
1465                                 queue_delayed_work(di->charger_wq,
1466                                         &di->kick_wd_work,
1467                                         round_jiffies(WD_KICK_INTERVAL));
1468                         }
1469 
1470                         /*
1471                          * We can't turn off charging completely
1472                          * due to a bug in AB8500 cut1.
1473                          * If we do, charging will not start again.
1474                          * That is why we set the lowest voltage
1475                          * and current possible
1476                          */
1477                         ret = abx500_set_register_interruptible(di->dev,
1478                                 AB8500_CHARGER,
1479                                 AB8500_CH_VOLT_LVL_REG, CH_VOL_LVL_3P5);
1480                         if (ret) {
1481                                 dev_err(di->dev,
1482                                         "%s write failed\n", __func__);
1483                                 return ret;
1484                         }
1485 
1486                         ret = ab8500_charger_set_output_curr(di, 0);
1487                         if (ret) {
1488                                 dev_err(di->dev, "%s "
1489                                         "Failed to set ChOutputCurentLevel\n",
1490                                         __func__);
1491                                 return ret;
1492                         }
1493                 } else {
1494                         ret = abx500_set_register_interruptible(di->dev,
1495                                 AB8500_CHARGER,
1496                                 AB8500_MCH_CTRL1, 0);
1497                         if (ret) {
1498                                 dev_err(di->dev,
1499                                         "%s write failed\n", __func__);
1500                                 return ret;
1501                         }
1502                 }
1503 
1504                 ret = ab8500_charger_led_en(di, false);
1505                 if (ret < 0)
1506                         dev_err(di->dev, "failed to disable LED\n");
1507 
1508                 di->ac.charger_online = 0;
1509                 di->ac.wd_expired = false;
1510 
1511                 /* Disable regulator if enabled */
1512                 if (di->vddadc_en_ac) {
1513                         regulator_disable(di->regu);
1514                         di->vddadc_en_ac = false;
1515                 }
1516 
1517                 dev_dbg(di->dev, "%s Disabled AC charging\n", __func__);
1518         }
1519         ab8500_power_supply_changed(di, &di->ac_chg.psy);
1520 
1521         return ret;
1522 }
1523 
1524 /**
1525  * ab8500_charger_usb_en() - enable usb charging
1526  * @di:         pointer to the ab8500_charger structure
1527  * @enable:     enable/disable flag
1528  * @vset:       charging voltage
1529  * @ich_out:    charger output current
1530  *
1531  * Enable/Disable USB charging and turns on/off the charging led respectively.
1532  * Returns error code in case of failure else 0(on success)
1533  */
1534 static int ab8500_charger_usb_en(struct ux500_charger *charger,
1535         int enable, int vset, int ich_out)
1536 {
1537         int ret;
1538         int volt_index;
1539         int curr_index;
1540         u8 overshoot = 0;
1541 
1542         struct ab8500_charger *di = to_ab8500_charger_usb_device_info(charger);
1543 
1544         if (enable) {
1545                 /* Check if USB is connected */
1546                 if (!di->usb.charger_connected) {
1547                         dev_err(di->dev, "USB charger not connected\n");
1548                         return -ENXIO;
1549                 }
1550 
1551                 /*
1552                  * Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
1553                  * will be triggered everytime we enable the VDD ADC supply.
1554                  * This will turn off charging for a short while.
1555                  * It can be avoided by having the supply on when
1556                  * there is a charger enabled. Normally the VDD ADC supply
1557                  * is enabled everytime a GPADC conversion is triggered. We will
1558                  * force it to be enabled from this driver to have
1559                  * the GPADC module independant of the AB8500 chargers
1560                  */
1561                 if (!di->vddadc_en_usb) {
1562                         ret = regulator_enable(di->regu);
1563                         if (ret)
1564                                 dev_warn(di->dev,
1565                                         "Failed to enable regulator\n");
1566                         else
1567                                 di->vddadc_en_usb = true;
1568                 }
1569 
1570                 /* Enable USB charging */
1571                 dev_dbg(di->dev, "Enable USB: %dmV %dmA\n", vset, ich_out);
1572 
1573                 /* Check if the requested voltage or current is valid */
1574                 volt_index = ab8500_voltage_to_regval(vset);
1575                 curr_index = ab8500_current_to_regval(di, ich_out);
1576                 if (volt_index < 0 || curr_index < 0) {
1577                         dev_err(di->dev,
1578                                 "Charger voltage or current too high, "
1579                                 "charging not started\n");
1580                         return -ENXIO;
1581                 }
1582 
1583                 /* ChVoltLevel: max voltage upto which battery can be charged */
1584                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1585                         AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
1586                 if (ret) {
1587                         dev_err(di->dev, "%s write failed\n", __func__);
1588                         return ret;
1589                 }
1590                 /* Check if VBAT overshoot control should be enabled */
1591                 if (!di->bm->enable_overshoot)
1592                         overshoot = USB_CHG_NO_OVERSHOOT_ENA_N;
1593 
1594                 /* Enable USB Charger */
1595                 dev_dbg(di->dev,
1596                         "Enabling USB with write to AB8500_USBCH_CTRL1_REG\n");
1597                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1598                         AB8500_USBCH_CTRL1_REG, USB_CH_ENA | overshoot);
1599                 if (ret) {
1600                         dev_err(di->dev, "%s write failed\n", __func__);
1601                         return ret;
1602                 }
1603 
1604                 /* If success power on charging LED indication */
1605                 ret = ab8500_charger_led_en(di, true);
1606                 if (ret < 0)
1607                         dev_err(di->dev, "failed to enable LED\n");
1608 
1609                 di->usb.charger_online = 1;
1610 
1611                 /* USBChInputCurr: current that can be drawn from the usb */
1612                 ret = ab8500_charger_set_vbus_in_curr(di,
1613                                         di->max_usb_in_curr.usb_type_max);
1614                 if (ret) {
1615                         dev_err(di->dev, "setting USBChInputCurr failed\n");
1616                         return ret;
1617                 }
1618 
1619                 /* ChOutputCurentLevel: protected output current */
1620                 ret = ab8500_charger_set_output_curr(di, ich_out);
1621                 if (ret) {
1622                         dev_err(di->dev, "%s "
1623                                 "Failed to set ChOutputCurentLevel\n",
1624                                 __func__);
1625                         return ret;
1626                 }
1627 
1628                 queue_delayed_work(di->charger_wq, &di->check_vbat_work, HZ);
1629 
1630         } else {
1631                 /* Disable USB charging */
1632                 dev_dbg(di->dev, "%s Disabled USB charging\n", __func__);
1633                 ret = abx500_set_register_interruptible(di->dev,
1634                         AB8500_CHARGER,
1635                         AB8500_USBCH_CTRL1_REG, 0);
1636                 if (ret) {
1637                         dev_err(di->dev,
1638                                 "%s write failed\n", __func__);
1639                         return ret;
1640                 }
1641 
1642                 ret = ab8500_charger_led_en(di, false);
1643                 if (ret < 0)
1644                         dev_err(di->dev, "failed to disable LED\n");
1645                 /* USBChInputCurr: current that can be drawn from the usb */
1646                 ret = ab8500_charger_set_vbus_in_curr(di, 0);
1647                 if (ret) {
1648                         dev_err(di->dev, "setting USBChInputCurr failed\n");
1649                         return ret;
1650                 }
1651 
1652                 /* ChOutputCurentLevel: protected output current */
1653                 ret = ab8500_charger_set_output_curr(di, 0);
1654                 if (ret) {
1655                         dev_err(di->dev, "%s "
1656                                 "Failed to reset ChOutputCurentLevel\n",
1657                                 __func__);
1658                         return ret;
1659                 }
1660                 di->usb.charger_online = 0;
1661                 di->usb.wd_expired = false;
1662 
1663                 /* Disable regulator if enabled */
1664                 if (di->vddadc_en_usb) {
1665                         regulator_disable(di->regu);
1666                         di->vddadc_en_usb = false;
1667                 }
1668 
1669                 dev_dbg(di->dev, "%s Disabled USB charging\n", __func__);
1670 
1671                 /* Cancel any pending Vbat check work */
1672                 cancel_delayed_work(&di->check_vbat_work);
1673 
1674         }
1675         ab8500_power_supply_changed(di, &di->usb_chg.psy);
1676 
1677         return ret;
1678 }
1679 
1680 static int ab8500_external_charger_prepare(struct notifier_block *charger_nb,
1681                                 unsigned long event, void *data)
1682 {
1683         int ret;
1684         struct device *dev = data;
1685         /*Toggle External charger control pin*/
1686         ret = abx500_set_register_interruptible(dev, AB8500_SYS_CTRL1_BLOCK,
1687                                   AB8500_SYS_CHARGER_CONTROL_REG,
1688                                   EXTERNAL_CHARGER_DISABLE_REG_VAL);
1689         if (ret < 0) {
1690                 dev_err(dev, "write reg failed %d\n", ret);
1691                 goto out;
1692         }
1693         ret = abx500_set_register_interruptible(dev, AB8500_SYS_CTRL1_BLOCK,
1694                                   AB8500_SYS_CHARGER_CONTROL_REG,
1695                                   EXTERNAL_CHARGER_ENABLE_REG_VAL);
1696         if (ret < 0)
1697                 dev_err(dev, "Write reg failed %d\n", ret);
1698 
1699 out:
1700         return ret;
1701 }
1702 
1703 /**
1704  * ab8500_charger_usb_check_enable() - enable usb charging
1705  * @charger:    pointer to the ux500_charger structure
1706  * @vset:       charging voltage
1707  * @iset:       charger output current
1708  *
1709  * Check if the VBUS charger has been disconnected and reconnected without
1710  * AB8500 rising an interrupt. Returns 0 on success.
1711  */
1712 static int ab8500_charger_usb_check_enable(struct ux500_charger *charger,
1713         int vset, int iset)
1714 {
1715         u8 usbch_ctrl1 = 0;
1716         int ret = 0;
1717 
1718         struct ab8500_charger *di = to_ab8500_charger_usb_device_info(charger);
1719 
1720         if (!di->usb.charger_connected)
1721                 return ret;
1722 
1723         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1724                                 AB8500_USBCH_CTRL1_REG, &usbch_ctrl1);
1725         if (ret < 0) {
1726                 dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
1727                 return ret;
1728         }
1729         dev_dbg(di->dev, "USB charger ctrl: 0x%02x\n", usbch_ctrl1);
1730 
1731         if (!(usbch_ctrl1 & USB_CH_ENA)) {
1732                 dev_info(di->dev, "Charging has been disabled abnormally and will be re-enabled\n");
1733 
1734                 ret = abx500_mask_and_set_register_interruptible(di->dev,
1735                                         AB8500_CHARGER, AB8500_CHARGER_CTRL,
1736                                         DROP_COUNT_RESET, DROP_COUNT_RESET);
1737                 if (ret < 0) {
1738                         dev_err(di->dev, "ab8500 write failed %d\n", __LINE__);
1739                         return ret;
1740                 }
1741 
1742                 ret = ab8500_charger_usb_en(&di->usb_chg, true, vset, iset);
1743                 if (ret < 0) {
1744                         dev_err(di->dev, "Failed to enable VBUS charger %d\n",
1745                                         __LINE__);
1746                         return ret;
1747                 }
1748         }
1749         return ret;
1750 }
1751 
1752 /**
1753  * ab8500_charger_ac_check_enable() - enable usb charging
1754  * @charger:    pointer to the ux500_charger structure
1755  * @vset:       charging voltage
1756  * @iset:       charger output current
1757  *
1758  * Check if the AC charger has been disconnected and reconnected without
1759  * AB8500 rising an interrupt. Returns 0 on success.
1760  */
1761 static int ab8500_charger_ac_check_enable(struct ux500_charger *charger,
1762         int vset, int iset)
1763 {
1764         u8 mainch_ctrl1 = 0;
1765         int ret = 0;
1766 
1767         struct ab8500_charger *di = to_ab8500_charger_ac_device_info(charger);
1768 
1769         if (!di->ac.charger_connected)
1770                 return ret;
1771 
1772         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1773                                 AB8500_MCH_CTRL1, &mainch_ctrl1);
1774         if (ret < 0) {
1775                 dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
1776                 return ret;
1777         }
1778         dev_dbg(di->dev, "AC charger ctrl: 0x%02x\n", mainch_ctrl1);
1779 
1780         if (!(mainch_ctrl1 & MAIN_CH_ENA)) {
1781                 dev_info(di->dev, "Charging has been disabled abnormally and will be re-enabled\n");
1782 
1783                 ret = abx500_mask_and_set_register_interruptible(di->dev,
1784                                         AB8500_CHARGER, AB8500_CHARGER_CTRL,
1785                                         DROP_COUNT_RESET, DROP_COUNT_RESET);
1786 
1787                 if (ret < 0) {
1788                         dev_err(di->dev, "ab8500 write failed %d\n", __LINE__);
1789                         return ret;
1790                 }
1791 
1792                 ret = ab8500_charger_ac_en(&di->usb_chg, true, vset, iset);
1793                 if (ret < 0) {
1794                         dev_err(di->dev, "failed to enable AC charger %d\n",
1795                                 __LINE__);
1796                         return ret;
1797                 }
1798         }
1799         return ret;
1800 }
1801 
1802 /**
1803  * ab8500_charger_watchdog_kick() - kick charger watchdog
1804  * @di:         pointer to the ab8500_charger structure
1805  *
1806  * Kick charger watchdog
1807  * Returns error code in case of failure else 0(on success)
1808  */
1809 static int ab8500_charger_watchdog_kick(struct ux500_charger *charger)
1810 {
1811         int ret;
1812         struct ab8500_charger *di;
1813 
1814         if (charger->psy.type == POWER_SUPPLY_TYPE_MAINS)
1815                 di = to_ab8500_charger_ac_device_info(charger);
1816         else if (charger->psy.type == POWER_SUPPLY_TYPE_USB)
1817                 di = to_ab8500_charger_usb_device_info(charger);
1818         else
1819                 return -ENXIO;
1820 
1821         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1822                 AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
1823         if (ret)
1824                 dev_err(di->dev, "Failed to kick WD!\n");
1825 
1826         return ret;
1827 }
1828 
1829 /**
1830  * ab8500_charger_update_charger_current() - update charger current
1831  * @di:         pointer to the ab8500_charger structure
1832  *
1833  * Update the charger output current for the specified charger
1834  * Returns error code in case of failure else 0(on success)
1835  */
1836 static int ab8500_charger_update_charger_current(struct ux500_charger *charger,
1837                 int ich_out)
1838 {
1839         int ret;
1840         struct ab8500_charger *di;
1841 
1842         if (charger->psy.type == POWER_SUPPLY_TYPE_MAINS)
1843                 di = to_ab8500_charger_ac_device_info(charger);
1844         else if (charger->psy.type == POWER_SUPPLY_TYPE_USB)
1845                 di = to_ab8500_charger_usb_device_info(charger);
1846         else
1847                 return -ENXIO;
1848 
1849         ret = ab8500_charger_set_output_curr(di, ich_out);
1850         if (ret) {
1851                 dev_err(di->dev, "%s "
1852                         "Failed to set ChOutputCurentLevel\n",
1853                         __func__);
1854                 return ret;
1855         }
1856 
1857         /* Reset the main and usb drop input current measurement counter */
1858         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1859                                 AB8500_CHARGER_CTRL, DROP_COUNT_RESET);
1860         if (ret) {
1861                 dev_err(di->dev, "%s write failed\n", __func__);
1862                 return ret;
1863         }
1864 
1865         return ret;
1866 }
1867 
1868 /**
1869  * ab8540_charger_power_path_enable() - enable usb power path mode
1870  * @charger:    pointer to the ux500_charger structure
1871  * @enable:     enable/disable flag
1872  *
1873  * Enable or disable the power path for usb mode
1874  * Returns error code in case of failure else 0(on success)
1875  */
1876 static int ab8540_charger_power_path_enable(struct ux500_charger *charger,
1877                 bool enable)
1878 {
1879         int ret;
1880         struct ab8500_charger *di;
1881 
1882         if (charger->psy.type == POWER_SUPPLY_TYPE_USB)
1883                 di = to_ab8500_charger_usb_device_info(charger);
1884         else
1885                 return -ENXIO;
1886 
1887         ret = abx500_mask_and_set_register_interruptible(di->dev,
1888                                 AB8500_CHARGER, AB8540_USB_PP_MODE_REG,
1889                                 BUS_POWER_PATH_MODE_ENA, enable);
1890         if (ret) {
1891                 dev_err(di->dev, "%s write failed\n", __func__);
1892                 return ret;
1893         }
1894 
1895         return ret;
1896 }
1897 
1898 
1899 /**
1900  * ab8540_charger_usb_pre_chg_enable() - enable usb pre change
1901  * @charger:    pointer to the ux500_charger structure
1902  * @enable:     enable/disable flag
1903  *
1904  * Enable or disable the pre-chage for usb mode
1905  * Returns error code in case of failure else 0(on success)
1906  */
1907 static int ab8540_charger_usb_pre_chg_enable(struct ux500_charger *charger,
1908                 bool enable)
1909 {
1910         int ret;
1911         struct ab8500_charger *di;
1912 
1913         if (charger->psy.type == POWER_SUPPLY_TYPE_USB)
1914                 di = to_ab8500_charger_usb_device_info(charger);
1915         else
1916                 return -ENXIO;
1917 
1918         ret = abx500_mask_and_set_register_interruptible(di->dev,
1919                                 AB8500_CHARGER, AB8540_USB_PP_CHR_REG,
1920                                 BUS_POWER_PATH_PRECHG_ENA, enable);
1921         if (ret) {
1922                 dev_err(di->dev, "%s write failed\n", __func__);
1923                 return ret;
1924         }
1925 
1926         return ret;
1927 }
1928 
1929 static int ab8500_charger_get_ext_psy_data(struct device *dev, void *data)
1930 {
1931         struct power_supply *psy;
1932         struct power_supply *ext;
1933         struct ab8500_charger *di;
1934         union power_supply_propval ret;
1935         int i, j;
1936         bool psy_found = false;
1937         struct ux500_charger *usb_chg;
1938 
1939         usb_chg = (struct ux500_charger *)data;
1940         psy = &usb_chg->psy;
1941 
1942         di = to_ab8500_charger_usb_device_info(usb_chg);
1943 
1944         ext = dev_get_drvdata(dev);
1945 
1946         /* For all psy where the driver name appears in any supplied_to */
1947         for (i = 0; i < ext->num_supplicants; i++) {
1948                 if (!strcmp(ext->supplied_to[i], psy->name))
1949                         psy_found = true;
1950         }
1951 
1952         if (!psy_found)
1953                 return 0;
1954 
1955         /* Go through all properties for the psy */
1956         for (j = 0; j < ext->num_properties; j++) {
1957                 enum power_supply_property prop;
1958                 prop = ext->properties[j];
1959 
1960                 if (ext->get_property(ext, prop, &ret))
1961                         continue;
1962 
1963                 switch (prop) {
1964                 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1965                         switch (ext->type) {
1966                         case POWER_SUPPLY_TYPE_BATTERY:
1967                                 di->vbat = ret.intval / 1000;
1968                                 break;
1969                         default:
1970                                 break;
1971                         }
1972                         break;
1973                 default:
1974                         break;
1975                 }
1976         }
1977         return 0;
1978 }
1979 
1980 /**
1981  * ab8500_charger_check_vbat_work() - keep vbus current within spec
1982  * @work        pointer to the work_struct structure
1983  *
1984  * Due to a asic bug it is necessary to lower the input current to the vbus
1985  * charger when charging with at some specific levels. This issue is only valid
1986  * for below a certain battery voltage. This function makes sure that the
1987  * the allowed current limit isn't exceeded.
1988  */
1989 static void ab8500_charger_check_vbat_work(struct work_struct *work)
1990 {
1991         int t = 10;
1992         struct ab8500_charger *di = container_of(work,
1993                 struct ab8500_charger, check_vbat_work.work);
1994 
1995         class_for_each_device(power_supply_class, NULL,
1996                 &di->usb_chg.psy, ab8500_charger_get_ext_psy_data);
1997 
1998         /* First run old_vbat is 0. */
1999         if (di->old_vbat == 0)
2000                 di->old_vbat = di->vbat;
2001 
2002         if (!((di->old_vbat <= VBAT_TRESH_IP_CUR_RED &&
2003                 di->vbat <= VBAT_TRESH_IP_CUR_RED) ||
2004                 (di->old_vbat > VBAT_TRESH_IP_CUR_RED &&
2005                 di->vbat > VBAT_TRESH_IP_CUR_RED))) {
2006 
2007                 dev_dbg(di->dev, "Vbat did cross threshold, curr: %d, new: %d,"
2008                         " old: %d\n", di->max_usb_in_curr.usb_type_max,
2009                         di->vbat, di->old_vbat);
2010                 ab8500_charger_set_vbus_in_curr(di,
2011                                         di->max_usb_in_curr.usb_type_max);
2012                 power_supply_changed(&di->usb_chg.psy);
2013         }
2014 
2015         di->old_vbat = di->vbat;
2016 
2017         /*
2018          * No need to check the battery voltage every second when not close to
2019          * the threshold.
2020          */
2021         if (di->vbat < (VBAT_TRESH_IP_CUR_RED + 100) &&
2022                 (di->vbat > (VBAT_TRESH_IP_CUR_RED - 100)))
2023                         t = 1;
2024 
2025         queue_delayed_work(di->charger_wq, &di->check_vbat_work, t * HZ);
2026 }
2027 
2028 /**
2029  * ab8500_charger_check_hw_failure_work() - check main charger failure
2030  * @work:       pointer to the work_struct structure
2031  *
2032  * Work queue function for checking the main charger status
2033  */
2034 static void ab8500_charger_check_hw_failure_work(struct work_struct *work)
2035 {
2036         int ret;
2037         u8 reg_value;
2038 
2039         struct ab8500_charger *di = container_of(work,
2040                 struct ab8500_charger, check_hw_failure_work.work);
2041 
2042         /* Check if the status bits for HW failure is still active */
2043         if (di->flags.mainextchnotok) {
2044                 ret = abx500_get_register_interruptible(di->dev,
2045                         AB8500_CHARGER, AB8500_CH_STATUS2_REG, &reg_value);
2046                 if (ret < 0) {
2047                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2048                         return;
2049                 }
2050                 if (!(reg_value & MAIN_CH_NOK)) {
2051                         di->flags.mainextchnotok = false;
2052                         ab8500_power_supply_changed(di, &di->ac_chg.psy);
2053                 }
2054         }
2055         if (di->flags.vbus_ovv) {
2056                 ret = abx500_get_register_interruptible(di->dev,
2057                         AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG,
2058                         &reg_value);
2059                 if (ret < 0) {
2060                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2061                         return;
2062                 }
2063                 if (!(reg_value & VBUS_OVV_TH)) {
2064                         di->flags.vbus_ovv = false;
2065                         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2066                 }
2067         }
2068         /* If we still have a failure, schedule a new check */
2069         if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
2070                 queue_delayed_work(di->charger_wq,
2071                         &di->check_hw_failure_work, round_jiffies(HZ));
2072         }
2073 }
2074 
2075 /**
2076  * ab8500_charger_kick_watchdog_work() - kick the watchdog
2077  * @work:       pointer to the work_struct structure
2078  *
2079  * Work queue function for kicking the charger watchdog.
2080  *
2081  * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
2082  * logic. That means we have to continously kick the charger
2083  * watchdog even when no charger is connected. This is only
2084  * valid once the AC charger has been enabled. This is
2085  * a bug that is not handled by the algorithm and the
2086  * watchdog have to be kicked by the charger driver
2087  * when the AC charger is disabled
2088  */
2089 static void ab8500_charger_kick_watchdog_work(struct work_struct *work)
2090 {
2091         int ret;
2092 
2093         struct ab8500_charger *di = container_of(work,
2094                 struct ab8500_charger, kick_wd_work.work);
2095 
2096         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
2097                 AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
2098         if (ret)
2099                 dev_err(di->dev, "Failed to kick WD!\n");
2100 
2101         /* Schedule a new watchdog kick */
2102         queue_delayed_work(di->charger_wq,
2103                 &di->kick_wd_work, round_jiffies(WD_KICK_INTERVAL));
2104 }
2105 
2106 /**
2107  * ab8500_charger_ac_work() - work to get and set main charger status
2108  * @work:       pointer to the work_struct structure
2109  *
2110  * Work queue function for checking the main charger status
2111  */
2112 static void ab8500_charger_ac_work(struct work_struct *work)
2113 {
2114         int ret;
2115 
2116         struct ab8500_charger *di = container_of(work,
2117                 struct ab8500_charger, ac_work);
2118 
2119         /*
2120          * Since we can't be sure that the events are received
2121          * synchronously, we have the check if the main charger is
2122          * connected by reading the status register
2123          */
2124         ret = ab8500_charger_detect_chargers(di, false);
2125         if (ret < 0)
2126                 return;
2127 
2128         if (ret & AC_PW_CONN) {
2129                 di->ac.charger_connected = 1;
2130                 di->ac_conn = true;
2131         } else {
2132                 di->ac.charger_connected = 0;
2133         }
2134 
2135         ab8500_power_supply_changed(di, &di->ac_chg.psy);
2136         sysfs_notify(&di->ac_chg.psy.dev->kobj, NULL, "present");
2137 }
2138 
2139 static void ab8500_charger_usb_attached_work(struct work_struct *work)
2140 {
2141         struct ab8500_charger *di = container_of(work,
2142                                                  struct ab8500_charger,
2143                                                  usb_charger_attached_work.work);
2144         int usbch = (USB_CH_VBUSDROP | USB_CH_VBUSDETDBNC);
2145         int ret, i;
2146         u8 statval;
2147 
2148         for (i = 0; i < 10; i++) {
2149                 ret = abx500_get_register_interruptible(di->dev,
2150                                                         AB8500_CHARGER,
2151                                                         AB8500_CH_USBCH_STAT1_REG,
2152                                                         &statval);
2153                 if (ret < 0) {
2154                         dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
2155                         goto reschedule;
2156                 }
2157                 if ((statval & usbch) != usbch)
2158                         goto reschedule;
2159 
2160                 msleep(CHARGER_STATUS_POLL);
2161         }
2162 
2163         ab8500_charger_usb_en(&di->usb_chg, 0, 0, 0);
2164 
2165         mutex_lock(&di->charger_attached_mutex);
2166         mutex_unlock(&di->charger_attached_mutex);
2167 
2168         return;
2169 
2170 reschedule:
2171         queue_delayed_work(di->charger_wq,
2172                            &di->usb_charger_attached_work,
2173                            HZ);
2174 }
2175 
2176 static void ab8500_charger_ac_attached_work(struct work_struct *work)
2177 {
2178 
2179         struct ab8500_charger *di = container_of(work,
2180                                                  struct ab8500_charger,
2181                                                  ac_charger_attached_work.work);
2182         int mainch = (MAIN_CH_STATUS2_MAINCHGDROP |
2183                       MAIN_CH_STATUS2_MAINCHARGERDETDBNC);
2184         int ret, i;
2185         u8 statval;
2186 
2187         for (i = 0; i < 10; i++) {
2188                 ret = abx500_get_register_interruptible(di->dev,
2189                                                         AB8500_CHARGER,
2190                                                         AB8500_CH_STATUS2_REG,
2191                                                         &statval);
2192                 if (ret < 0) {
2193                         dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
2194                         goto reschedule;
2195                 }
2196 
2197                 if ((statval & mainch) != mainch)
2198                         goto reschedule;
2199 
2200                 msleep(CHARGER_STATUS_POLL);
2201         }
2202 
2203         ab8500_charger_ac_en(&di->ac_chg, 0, 0, 0);
2204         queue_work(di->charger_wq, &di->ac_work);
2205 
2206         mutex_lock(&di->charger_attached_mutex);
2207         mutex_unlock(&di->charger_attached_mutex);
2208 
2209         return;
2210 
2211 reschedule:
2212         queue_delayed_work(di->charger_wq,
2213                            &di->ac_charger_attached_work,
2214                            HZ);
2215 }
2216 
2217 /**
2218  * ab8500_charger_detect_usb_type_work() - work to detect USB type
2219  * @work:       Pointer to the work_struct structure
2220  *
2221  * Detect the type of USB plugged
2222  */
2223 static void ab8500_charger_detect_usb_type_work(struct work_struct *work)
2224 {
2225         int ret;
2226 
2227         struct ab8500_charger *di = container_of(work,
2228                 struct ab8500_charger, detect_usb_type_work);
2229 
2230         /*
2231          * Since we can't be sure that the events are received
2232          * synchronously, we have the check if is
2233          * connected by reading the status register
2234          */
2235         ret = ab8500_charger_detect_chargers(di, false);
2236         if (ret < 0)
2237                 return;
2238 
2239         if (!(ret & USB_PW_CONN)) {
2240                 dev_dbg(di->dev, "%s di->vbus_detected = false\n", __func__);
2241                 di->vbus_detected = false;
2242                 ab8500_charger_set_usb_connected(di, false);
2243                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2244         } else {
2245                 dev_dbg(di->dev, "%s di->vbus_detected = true\n", __func__);
2246                 di->vbus_detected = true;
2247 
2248                 if (is_ab8500_1p1_or_earlier(di->parent)) {
2249                         ret = ab8500_charger_detect_usb_type(di);
2250                         if (!ret) {
2251                                 ab8500_charger_set_usb_connected(di, true);
2252                                 ab8500_power_supply_changed(di,
2253                                                             &di->usb_chg.psy);
2254                         }
2255                 } else {
2256                         /*
2257                          * For ABB cut2.0 and onwards we have an IRQ,
2258                          * USB_LINK_STATUS that will be triggered when the USB
2259                          * link status changes. The exception is USB connected
2260                          * during startup. Then we don't get a
2261                          * USB_LINK_STATUS IRQ
2262                          */
2263                         if (di->vbus_detected_start) {
2264                                 di->vbus_detected_start = false;
2265                                 ret = ab8500_charger_detect_usb_type(di);
2266                                 if (!ret) {
2267                                         ab8500_charger_set_usb_connected(di,
2268                                                 true);
2269                                         ab8500_power_supply_changed(di,
2270                                                 &di->usb_chg.psy);
2271                                 }
2272                         }
2273                 }
2274         }
2275 }
2276 
2277 /**
2278  * ab8500_charger_usb_link_attach_work() - work to detect USB type
2279  * @work:       pointer to the work_struct structure
2280  *
2281  * Detect the type of USB plugged
2282  */
2283 static void ab8500_charger_usb_link_attach_work(struct work_struct *work)
2284 {
2285         struct ab8500_charger *di =
2286                 container_of(work, struct ab8500_charger, attach_work.work);
2287         int ret;
2288 
2289         /* Update maximum input current if USB enumeration is not detected */
2290         if (!di->usb.charger_online) {
2291                 ret = ab8500_charger_set_vbus_in_curr(di,
2292                                         di->max_usb_in_curr.usb_type_max);
2293                 if (ret)
2294                         return;
2295         }
2296 
2297         ab8500_charger_set_usb_connected(di, true);
2298         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2299 }
2300 
2301 /**
2302  * ab8500_charger_usb_link_status_work() - work to detect USB type
2303  * @work:       pointer to the work_struct structure
2304  *
2305  * Detect the type of USB plugged
2306  */
2307 static void ab8500_charger_usb_link_status_work(struct work_struct *work)
2308 {
2309         int detected_chargers;
2310         int ret;
2311         u8 val;
2312         u8 link_status;
2313 
2314         struct ab8500_charger *di = container_of(work,
2315                 struct ab8500_charger, usb_link_status_work);
2316 
2317         /*
2318          * Since we can't be sure that the events are received
2319          * synchronously, we have the check if  is
2320          * connected by reading the status register
2321          */
2322         detected_chargers = ab8500_charger_detect_chargers(di, false);
2323         if (detected_chargers < 0)
2324                 return;
2325 
2326         /*
2327          * Some chargers that breaks the USB spec is
2328          * identified as invalid by AB8500 and it refuse
2329          * to start the charging process. but by jumping
2330          * thru a few hoops it can be forced to start.
2331          */
2332         if (is_ab8500(di->parent))
2333                 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
2334                                         AB8500_USB_LINE_STAT_REG, &val);
2335         else
2336                 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
2337                                         AB8500_USB_LINK1_STAT_REG, &val);
2338 
2339         if (ret >= 0)
2340                 dev_dbg(di->dev, "UsbLineStatus register = 0x%02x\n", val);
2341         else
2342                 dev_dbg(di->dev, "Error reading USB link status\n");
2343 
2344         if (is_ab8500(di->parent))
2345                 link_status = AB8500_USB_LINK_STATUS;
2346         else
2347                 link_status = AB8505_USB_LINK_STATUS;
2348 
2349         if (detected_chargers & USB_PW_CONN) {
2350                 if (((val & link_status) >> USB_LINK_STATUS_SHIFT) ==
2351                                 USB_STAT_NOT_VALID_LINK &&
2352                                 di->invalid_charger_detect_state == 0) {
2353                         dev_dbg(di->dev,
2354                                         "Invalid charger detected, state= 0\n");
2355                         /*Enable charger*/
2356                         abx500_mask_and_set_register_interruptible(di->dev,
2357                                         AB8500_CHARGER, AB8500_USBCH_CTRL1_REG,
2358                                         USB_CH_ENA, USB_CH_ENA);
2359                         /*Enable charger detection*/
2360                         abx500_mask_and_set_register_interruptible(di->dev,
2361                                         AB8500_USB, AB8500_USB_LINE_CTRL2_REG,
2362                                         USB_CH_DET, USB_CH_DET);
2363                         di->invalid_charger_detect_state = 1;
2364                         /*exit and wait for new link status interrupt.*/
2365                         return;
2366 
2367                 }
2368                 if (di->invalid_charger_detect_state == 1) {
2369                         dev_dbg(di->dev,
2370                                         "Invalid charger detected, state= 1\n");
2371                         /*Stop charger detection*/
2372                         abx500_mask_and_set_register_interruptible(di->dev,
2373                                         AB8500_USB, AB8500_USB_LINE_CTRL2_REG,
2374                                         USB_CH_DET, 0x00);
2375                         /*Check link status*/
2376                         if (is_ab8500(di->parent))
2377                                 ret = abx500_get_register_interruptible(di->dev,
2378                                         AB8500_USB, AB8500_USB_LINE_STAT_REG,
2379                                         &val);
2380                         else
2381                                 ret = abx500_get_register_interruptible(di->dev,
2382                                         AB8500_USB, AB8500_USB_LINK1_STAT_REG,
2383                                         &val);
2384 
2385                         dev_dbg(di->dev, "USB link status= 0x%02x\n",
2386                                 (val & link_status) >> USB_LINK_STATUS_SHIFT);
2387                         di->invalid_charger_detect_state = 2;
2388                 }
2389         } else {
2390                 di->invalid_charger_detect_state = 0;
2391         }
2392 
2393         if (!(detected_chargers & USB_PW_CONN)) {
2394                 di->vbus_detected = false;
2395                 ab8500_charger_set_usb_connected(di, false);
2396                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2397                 return;
2398         }
2399 
2400         dev_dbg(di->dev,"%s di->vbus_detected = true\n",__func__);
2401         di->vbus_detected = true;
2402         ret = ab8500_charger_read_usb_type(di);
2403         if (ret) {
2404                 if (ret == -ENXIO) {
2405                         /* No valid charger type detected */
2406                         ab8500_charger_set_usb_connected(di, false);
2407                         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2408                 }
2409                 return;
2410         }
2411 
2412         if (di->usb_device_is_unrecognised) {
2413                 dev_dbg(di->dev,
2414                         "Potential Legacy Charger device. "
2415                         "Delay work for %d msec for USB enum "
2416                         "to finish",
2417                         WAIT_ACA_RID_ENUMERATION);
2418                 queue_delayed_work(di->charger_wq,
2419                                    &di->attach_work,
2420                                    msecs_to_jiffies(WAIT_ACA_RID_ENUMERATION));
2421         } else if (di->is_aca_rid == 1) {
2422                 /* Only wait once */
2423                 di->is_aca_rid++;
2424                 dev_dbg(di->dev,
2425                         "%s Wait %d msec for USB enum to finish",
2426                         __func__, WAIT_ACA_RID_ENUMERATION);
2427                 queue_delayed_work(di->charger_wq,
2428                                    &di->attach_work,
2429                                    msecs_to_jiffies(WAIT_ACA_RID_ENUMERATION));
2430         } else {
2431                 queue_delayed_work(di->charger_wq,
2432                                    &di->attach_work,
2433                                    0);
2434         }
2435 }
2436 
2437 static void ab8500_charger_usb_state_changed_work(struct work_struct *work)
2438 {
2439         int ret;
2440         unsigned long flags;
2441 
2442         struct ab8500_charger *di = container_of(work,
2443                 struct ab8500_charger, usb_state_changed_work.work);
2444 
2445         if (!di->vbus_detected) {
2446                 dev_dbg(di->dev,
2447                         "%s !di->vbus_detected\n",
2448                         __func__);
2449                 return;
2450         }
2451 
2452         spin_lock_irqsave(&di->usb_state.usb_lock, flags);
2453         di->usb_state.state = di->usb_state.state_tmp;
2454         di->usb_state.usb_current = di->usb_state.usb_current_tmp;
2455         spin_unlock_irqrestore(&di->usb_state.usb_lock, flags);
2456 
2457         dev_dbg(di->dev, "%s USB state: 0x%02x mA: %d\n",
2458                 __func__, di->usb_state.state, di->usb_state.usb_current);
2459 
2460         switch (di->usb_state.state) {
2461         case AB8500_BM_USB_STATE_RESET_HS:
2462         case AB8500_BM_USB_STATE_RESET_FS:
2463         case AB8500_BM_USB_STATE_SUSPEND:
2464         case AB8500_BM_USB_STATE_MAX:
2465                 ab8500_charger_set_usb_connected(di, false);
2466                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2467                 break;
2468 
2469         case AB8500_BM_USB_STATE_RESUME:
2470                 /*
2471                  * when suspend->resume there should be delay
2472                  * of 1sec for enabling charging
2473                  */
2474                 msleep(1000);
2475                 /* Intentional fall through */
2476         case AB8500_BM_USB_STATE_CONFIGURED:
2477                 /*
2478                  * USB is configured, enable charging with the charging
2479                  * input current obtained from USB driver
2480                  */
2481                 if (!ab8500_charger_get_usb_cur(di)) {
2482                         /* Update maximum input current */
2483                         ret = ab8500_charger_set_vbus_in_curr(di,
2484                                         di->max_usb_in_curr.usb_type_max);
2485                         if (ret)
2486                                 return;
2487 
2488                         ab8500_charger_set_usb_connected(di, true);
2489                         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2490                 }
2491                 break;
2492 
2493         default:
2494                 break;
2495         };
2496 }
2497 
2498 /**
2499  * ab8500_charger_check_usbchargernotok_work() - check USB chg not ok status
2500  * @work:       pointer to the work_struct structure
2501  *
2502  * Work queue function for checking the USB charger Not OK status
2503  */
2504 static void ab8500_charger_check_usbchargernotok_work(struct work_struct *work)
2505 {
2506         int ret;
2507         u8 reg_value;
2508         bool prev_status;
2509 
2510         struct ab8500_charger *di = container_of(work,
2511                 struct ab8500_charger, check_usbchgnotok_work.work);
2512 
2513         /* Check if the status bit for usbchargernotok is still active */
2514         ret = abx500_get_register_interruptible(di->dev,
2515                 AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, &reg_value);
2516         if (ret < 0) {
2517                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2518                 return;
2519         }
2520         prev_status = di->flags.usbchargernotok;
2521 
2522         if (reg_value & VBUS_CH_NOK) {
2523                 di->flags.usbchargernotok = true;
2524                 /* Check again in 1sec */
2525                 queue_delayed_work(di->charger_wq,
2526                         &di->check_usbchgnotok_work, HZ);
2527         } else {
2528                 di->flags.usbchargernotok = false;
2529                 di->flags.vbus_collapse = false;
2530         }
2531 
2532         if (prev_status != di->flags.usbchargernotok)
2533                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2534 }
2535 
2536 /**
2537  * ab8500_charger_check_main_thermal_prot_work() - check main thermal status
2538  * @work:       pointer to the work_struct structure
2539  *
2540  * Work queue function for checking the Main thermal prot status
2541  */
2542 static void ab8500_charger_check_main_thermal_prot_work(
2543         struct work_struct *work)
2544 {
2545         int ret;
2546         u8 reg_value;
2547 
2548         struct ab8500_charger *di = container_of(work,
2549                 struct ab8500_charger, check_main_thermal_prot_work);
2550 
2551         /* Check if the status bit for main_thermal_prot is still active */
2552         ret = abx500_get_register_interruptible(di->dev,
2553                 AB8500_CHARGER, AB8500_CH_STATUS2_REG, &reg_value);
2554         if (ret < 0) {
2555                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2556                 return;
2557         }
2558         if (reg_value & MAIN_CH_TH_PROT)
2559                 di->flags.main_thermal_prot = true;
2560         else
2561                 di->flags.main_thermal_prot = false;
2562 
2563         ab8500_power_supply_changed(di, &di->ac_chg.psy);
2564 }
2565 
2566 /**
2567  * ab8500_charger_check_usb_thermal_prot_work() - check usb thermal status
2568  * @work:       pointer to the work_struct structure
2569  *
2570  * Work queue function for checking the USB thermal prot status
2571  */
2572 static void ab8500_charger_check_usb_thermal_prot_work(
2573         struct work_struct *work)
2574 {
2575         int ret;
2576         u8 reg_value;
2577 
2578         struct ab8500_charger *di = container_of(work,
2579                 struct ab8500_charger, check_usb_thermal_prot_work);
2580 
2581         /* Check if the status bit for usb_thermal_prot is still active */
2582         ret = abx500_get_register_interruptible(di->dev,
2583                 AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, &reg_value);
2584         if (ret < 0) {
2585                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2586                 return;
2587         }
2588         if (reg_value & USB_CH_TH_PROT)
2589                 di->flags.usb_thermal_prot = true;
2590         else
2591                 di->flags.usb_thermal_prot = false;
2592 
2593         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2594 }
2595 
2596 /**
2597  * ab8500_charger_mainchunplugdet_handler() - main charger unplugged
2598  * @irq:       interrupt number
2599  * @_di:       pointer to the ab8500_charger structure
2600  *
2601  * Returns IRQ status(IRQ_HANDLED)
2602  */
2603 static irqreturn_t ab8500_charger_mainchunplugdet_handler(int irq, void *_di)
2604 {
2605         struct ab8500_charger *di = _di;
2606 
2607         dev_dbg(di->dev, "Main charger unplugged\n");
2608         queue_work(di->charger_wq, &di->ac_work);
2609 
2610         cancel_delayed_work_sync(&di->ac_charger_attached_work);
2611         mutex_lock(&di->charger_attached_mutex);
2612         mutex_unlock(&di->charger_attached_mutex);
2613 
2614         return IRQ_HANDLED;
2615 }
2616 
2617 /**
2618  * ab8500_charger_mainchplugdet_handler() - main charger plugged
2619  * @irq:       interrupt number
2620  * @_di:       pointer to the ab8500_charger structure
2621  *
2622  * Returns IRQ status(IRQ_HANDLED)
2623  */
2624 static irqreturn_t ab8500_charger_mainchplugdet_handler(int irq, void *_di)
2625 {
2626         struct ab8500_charger *di = _di;
2627 
2628         dev_dbg(di->dev, "Main charger plugged\n");
2629         queue_work(di->charger_wq, &di->ac_work);
2630 
2631         mutex_lock(&di->charger_attached_mutex);
2632         mutex_unlock(&di->charger_attached_mutex);
2633 
2634         if (is_ab8500(di->parent))
2635                 queue_delayed_work(di->charger_wq,
2636                            &di->ac_charger_attached_work,
2637                            HZ);
2638         return IRQ_HANDLED;
2639 }
2640 
2641 /**
2642  * ab8500_charger_mainextchnotok_handler() - main charger not ok
2643  * @irq:       interrupt number
2644  * @_di:       pointer to the ab8500_charger structure
2645  *
2646  * Returns IRQ status(IRQ_HANDLED)
2647  */
2648 static irqreturn_t ab8500_charger_mainextchnotok_handler(int irq, void *_di)
2649 {
2650         struct ab8500_charger *di = _di;
2651 
2652         dev_dbg(di->dev, "Main charger not ok\n");
2653         di->flags.mainextchnotok = true;
2654         ab8500_power_supply_changed(di, &di->ac_chg.psy);
2655 
2656         /* Schedule a new HW failure check */
2657         queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
2658 
2659         return IRQ_HANDLED;
2660 }
2661 
2662 /**
2663  * ab8500_charger_mainchthprotr_handler() - Die temp is above main charger
2664  * thermal protection threshold
2665  * @irq:       interrupt number
2666  * @_di:       pointer to the ab8500_charger structure
2667  *
2668  * Returns IRQ status(IRQ_HANDLED)
2669  */
2670 static irqreturn_t ab8500_charger_mainchthprotr_handler(int irq, void *_di)
2671 {
2672         struct ab8500_charger *di = _di;
2673 
2674         dev_dbg(di->dev,
2675                 "Die temp above Main charger thermal protection threshold\n");
2676         queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
2677 
2678         return IRQ_HANDLED;
2679 }
2680 
2681 /**
2682  * ab8500_charger_mainchthprotf_handler() - Die temp is below main charger
2683  * thermal protection threshold
2684  * @irq:       interrupt number
2685  * @_di:       pointer to the ab8500_charger structure
2686  *
2687  * Returns IRQ status(IRQ_HANDLED)
2688  */
2689 static irqreturn_t ab8500_charger_mainchthprotf_handler(int irq, void *_di)
2690 {
2691         struct ab8500_charger *di = _di;
2692 
2693         dev_dbg(di->dev,
2694                 "Die temp ok for Main charger thermal protection threshold\n");
2695         queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
2696 
2697         return IRQ_HANDLED;
2698 }
2699 
2700 static void ab8500_charger_vbus_drop_end_work(struct work_struct *work)
2701 {
2702         struct ab8500_charger *di = container_of(work,
2703                 struct ab8500_charger, vbus_drop_end_work.work);
2704         int ret, curr;
2705         u8 reg_value;
2706 
2707         di->flags.vbus_drop_end = false;
2708 
2709         /* Reset the drop counter */
2710         abx500_set_register_interruptible(di->dev,
2711                                   AB8500_CHARGER, AB8500_CHARGER_CTRL, 0x01);
2712 
2713         if (is_ab8540(di->parent))
2714                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
2715                                 AB8540_CH_USBCH_STAT3_REG, &reg_value);
2716         else
2717                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
2718                                 AB8500_CH_USBCH_STAT2_REG, &reg_value);
2719         if (ret < 0) {
2720                 dev_err(di->dev, "%s read failed\n", __func__);
2721                 return;
2722         }
2723 
2724         if (is_ab8540(di->parent))
2725                 curr = di->bm->chg_input_curr[
2726                         reg_value & AB8540_AUTO_VBUS_IN_CURR_MASK];
2727         else
2728                 curr = di->bm->chg_input_curr[
2729                         reg_value >> AUTO_VBUS_IN_CURR_LIM_SHIFT];
2730 
2731         if (di->max_usb_in_curr.calculated_max != curr) {
2732                 /* USB source is collapsing */
2733                 di->max_usb_in_curr.calculated_max = curr;
2734                 dev_dbg(di->dev,
2735                          "VBUS input current limiting to %d mA\n",
2736                          di->max_usb_in_curr.calculated_max);
2737         } else {
2738                 /*
2739                  * USB source can not give more than this amount.
2740                  * Taking more will collapse the source.
2741                  */
2742                 di->max_usb_in_curr.set_max =
2743                         di->max_usb_in_curr.calculated_max;
2744                 dev_dbg(di->dev,
2745                          "VBUS input current limited to %d mA\n",
2746                          di->max_usb_in_curr.set_max);
2747         }
2748 
2749         if (di->usb.charger_connected)
2750                 ab8500_charger_set_vbus_in_curr(di,
2751                                         di->max_usb_in_curr.usb_type_max);
2752 }
2753 
2754 /**
2755  * ab8500_charger_vbusdetf_handler() - VBUS falling detected
2756  * @irq:       interrupt number
2757  * @_di:       pointer to the ab8500_charger structure
2758  *
2759  * Returns IRQ status(IRQ_HANDLED)
2760  */
2761 static irqreturn_t ab8500_charger_vbusdetf_handler(int irq, void *_di)
2762 {
2763         struct ab8500_charger *di = _di;
2764 
2765         di->vbus_detected = false;
2766         dev_dbg(di->dev, "VBUS falling detected\n");
2767         queue_work(di->charger_wq, &di->detect_usb_type_work);
2768 
2769         return IRQ_HANDLED;
2770 }
2771 
2772 /**
2773  * ab8500_charger_vbusdetr_handler() - VBUS rising detected
2774  * @irq:       interrupt number
2775  * @_di:       pointer to the ab8500_charger structure
2776  *
2777  * Returns IRQ status(IRQ_HANDLED)
2778  */
2779 static irqreturn_t ab8500_charger_vbusdetr_handler(int irq, void *_di)
2780 {
2781         struct ab8500_charger *di = _di;
2782 
2783         di->vbus_detected = true;
2784         dev_dbg(di->dev, "VBUS rising detected\n");
2785 
2786         queue_work(di->charger_wq, &di->detect_usb_type_work);
2787 
2788         return IRQ_HANDLED;
2789 }
2790 
2791 /**
2792  * ab8500_charger_usblinkstatus_handler() - USB link status has changed
2793  * @irq:       interrupt number
2794  * @_di:       pointer to the ab8500_charger structure
2795  *
2796  * Returns IRQ status(IRQ_HANDLED)
2797  */
2798 static irqreturn_t ab8500_charger_usblinkstatus_handler(int irq, void *_di)
2799 {
2800         struct ab8500_charger *di = _di;
2801 
2802         dev_dbg(di->dev, "USB link status changed\n");
2803 
2804         queue_work(di->charger_wq, &di->usb_link_status_work);
2805 
2806         return IRQ_HANDLED;
2807 }
2808 
2809 /**
2810  * ab8500_charger_usbchthprotr_handler() - Die temp is above usb charger
2811  * thermal protection threshold
2812  * @irq:       interrupt number
2813  * @_di:       pointer to the ab8500_charger structure
2814  *
2815  * Returns IRQ status(IRQ_HANDLED)
2816  */
2817 static irqreturn_t ab8500_charger_usbchthprotr_handler(int irq, void *_di)
2818 {
2819         struct ab8500_charger *di = _di;
2820 
2821         dev_dbg(di->dev,
2822                 "Die temp above USB charger thermal protection threshold\n");
2823         queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
2824 
2825         return IRQ_HANDLED;
2826 }
2827 
2828 /**
2829  * ab8500_charger_usbchthprotf_handler() - Die temp is below usb charger
2830  * thermal protection threshold
2831  * @irq:       interrupt number
2832  * @_di:       pointer to the ab8500_charger structure
2833  *
2834  * Returns IRQ status(IRQ_HANDLED)
2835  */
2836 static irqreturn_t ab8500_charger_usbchthprotf_handler(int irq, void *_di)
2837 {
2838         struct ab8500_charger *di = _di;
2839 
2840         dev_dbg(di->dev,
2841                 "Die temp ok for USB charger thermal protection threshold\n");
2842         queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
2843 
2844         return IRQ_HANDLED;
2845 }
2846 
2847 /**
2848  * ab8500_charger_usbchargernotokr_handler() - USB charger not ok detected
2849  * @irq:       interrupt number
2850  * @_di:       pointer to the ab8500_charger structure
2851  *
2852  * Returns IRQ status(IRQ_HANDLED)
2853  */
2854 static irqreturn_t ab8500_charger_usbchargernotokr_handler(int irq, void *_di)
2855 {
2856         struct ab8500_charger *di = _di;
2857 
2858         dev_dbg(di->dev, "Not allowed USB charger detected\n");
2859         queue_delayed_work(di->charger_wq, &di->check_usbchgnotok_work, 0);
2860 
2861         return IRQ_HANDLED;
2862 }
2863 
2864 /**
2865  * ab8500_charger_chwdexp_handler() - Charger watchdog expired
2866  * @irq:       interrupt number
2867  * @_di:       pointer to the ab8500_charger structure
2868  *
2869  * Returns IRQ status(IRQ_HANDLED)
2870  */
2871 static irqreturn_t ab8500_charger_chwdexp_handler(int irq, void *_di)
2872 {
2873         struct ab8500_charger *di = _di;
2874 
2875         dev_dbg(di->dev, "Charger watchdog expired\n");
2876 
2877         /*
2878          * The charger that was online when the watchdog expired
2879          * needs to be restarted for charging to start again
2880          */
2881         if (di->ac.charger_online) {
2882                 di->ac.wd_expired = true;
2883                 ab8500_power_supply_changed(di, &di->ac_chg.psy);
2884         }
2885         if (di->usb.charger_online) {
2886                 di->usb.wd_expired = true;
2887                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2888         }
2889 
2890         return IRQ_HANDLED;
2891 }
2892 
2893 /**
2894  * ab8500_charger_vbuschdropend_handler() - VBUS drop removed
2895  * @irq:       interrupt number
2896  * @_di:       pointer to the ab8500_charger structure
2897  *
2898  * Returns IRQ status(IRQ_HANDLED)
2899  */
2900 static irqreturn_t ab8500_charger_vbuschdropend_handler(int irq, void *_di)
2901 {
2902         struct ab8500_charger *di = _di;
2903 
2904         dev_dbg(di->dev, "VBUS charger drop ended\n");
2905         di->flags.vbus_drop_end = true;
2906 
2907         /*
2908          * VBUS might have dropped due to bad connection.
2909          * Schedule a new input limit set to the value SW requests.
2910          */
2911         queue_delayed_work(di->charger_wq, &di->vbus_drop_end_work,
2912                            round_jiffies(VBUS_IN_CURR_LIM_RETRY_SET_TIME * HZ));
2913 
2914         return IRQ_HANDLED;
2915 }
2916 
2917 /**
2918  * ab8500_charger_vbusovv_handler() - VBUS overvoltage detected
2919  * @irq:       interrupt number
2920  * @_di:       pointer to the ab8500_charger structure
2921  *
2922  * Returns IRQ status(IRQ_HANDLED)
2923  */
2924 static irqreturn_t ab8500_charger_vbusovv_handler(int irq, void *_di)
2925 {
2926         struct ab8500_charger *di = _di;
2927 
2928         dev_dbg(di->dev, "VBUS overvoltage detected\n");
2929         di->flags.vbus_ovv = true;
2930         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2931 
2932         /* Schedule a new HW failure check */
2933         queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
2934 
2935         return IRQ_HANDLED;
2936 }
2937 
2938 /**
2939  * ab8500_charger_ac_get_property() - get the ac/mains properties
2940  * @psy:       pointer to the power_supply structure
2941  * @psp:       pointer to the power_supply_property structure
2942  * @val:       pointer to the power_supply_propval union
2943  *
2944  * This function gets called when an application tries to get the ac/mains
2945  * properties by reading the sysfs files.
2946  * AC/Mains properties are online, present and voltage.
2947  * online:     ac/mains charging is in progress or not
2948  * present:    presence of the ac/mains
2949  * voltage:    AC/Mains voltage
2950  * Returns error code in case of failure else 0(on success)
2951  */
2952 static int ab8500_charger_ac_get_property(struct power_supply *psy,
2953         enum power_supply_property psp,
2954         union power_supply_propval *val)
2955 {
2956         struct ab8500_charger *di;
2957         int ret;
2958 
2959         di = to_ab8500_charger_ac_device_info(psy_to_ux500_charger(psy));
2960 
2961         switch (psp) {
2962         case POWER_SUPPLY_PROP_HEALTH:
2963                 if (di->flags.mainextchnotok)
2964                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
2965                 else if (di->ac.wd_expired || di->usb.wd_expired)
2966                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
2967                 else if (di->flags.main_thermal_prot)
2968                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
2969                 else
2970                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
2971                 break;
2972         case POWER_SUPPLY_PROP_ONLINE:
2973                 val->intval = di->ac.charger_online;
2974                 break;
2975         case POWER_SUPPLY_PROP_PRESENT:
2976                 val->intval = di->ac.charger_connected;
2977                 break;
2978         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
2979                 ret = ab8500_charger_get_ac_voltage(di);
2980                 if (ret >= 0)
2981                         di->ac.charger_voltage = ret;
2982                 /* On error, use previous value */
2983                 val->intval = di->ac.charger_voltage * 1000;
2984                 break;
2985         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
2986                 /*
2987                  * This property is used to indicate when CV mode is entered
2988                  * for the AC charger
2989                  */
2990                 di->ac.cv_active = ab8500_charger_ac_cv(di);
2991                 val->intval = di->ac.cv_active;
2992                 break;
2993         case POWER_SUPPLY_PROP_CURRENT_NOW:
2994                 ret = ab8500_charger_get_ac_current(di);
2995                 if (ret >= 0)
2996                         di->ac.charger_current = ret;
2997                 val->intval = di->ac.charger_current * 1000;
2998                 break;
2999         default:
3000                 return -EINVAL;
3001         }
3002         return 0;
3003 }
3004 
3005 /**
3006  * ab8500_charger_usb_get_property() - get the usb properties
3007  * @psy:        pointer to the power_supply structure
3008  * @psp:        pointer to the power_supply_property structure
3009  * @val:        pointer to the power_supply_propval union
3010  *
3011  * This function gets called when an application tries to get the usb
3012  * properties by reading the sysfs files.
3013  * USB properties are online, present and voltage.
3014  * online:     usb charging is in progress or not
3015  * present:    presence of the usb
3016  * voltage:    vbus voltage
3017  * Returns error code in case of failure else 0(on success)
3018  */
3019 static int ab8500_charger_usb_get_property(struct power_supply *psy,
3020         enum power_supply_property psp,
3021         union power_supply_propval *val)
3022 {
3023         struct ab8500_charger *di;
3024         int ret;
3025 
3026         di = to_ab8500_charger_usb_device_info(psy_to_ux500_charger(psy));
3027 
3028         switch (psp) {
3029         case POWER_SUPPLY_PROP_HEALTH:
3030                 if (di->flags.usbchargernotok)
3031                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
3032                 else if (di->ac.wd_expired || di->usb.wd_expired)
3033                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
3034                 else if (di->flags.usb_thermal_prot)
3035                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
3036                 else if (di->flags.vbus_ovv)
3037                         val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
3038                 else
3039                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
3040                 break;
3041         case POWER_SUPPLY_PROP_ONLINE:
3042                 val->intval = di->usb.charger_online;
3043                 break;
3044         case POWER_SUPPLY_PROP_PRESENT:
3045                 val->intval = di->usb.charger_connected;
3046                 break;
3047         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
3048                 ret = ab8500_charger_get_vbus_voltage(di);
3049                 if (ret >= 0)
3050                         di->usb.charger_voltage = ret;
3051                 val->intval = di->usb.charger_voltage * 1000;
3052                 break;
3053         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
3054                 /*
3055                  * This property is used to indicate when CV mode is entered
3056                  * for the USB charger
3057                  */
3058                 di->usb.cv_active = ab8500_charger_usb_cv(di);
3059                 val->intval = di->usb.cv_active;
3060                 break;
3061         case POWER_SUPPLY_PROP_CURRENT_NOW:
3062                 ret = ab8500_charger_get_usb_current(di);
3063                 if (ret >= 0)
3064                         di->usb.charger_current = ret;
3065                 val->intval = di->usb.charger_current * 1000;
3066                 break;
3067         case POWER_SUPPLY_PROP_CURRENT_AVG:
3068                 /*
3069                  * This property is used to indicate when VBUS has collapsed
3070                  * due to too high output current from the USB charger
3071                  */
3072                 if (di->flags.vbus_collapse)
3073                         val->intval = 1;
3074                 else
3075                         val->intval = 0;
3076                 break;
3077         default:
3078                 return -EINVAL;
3079         }
3080         return 0;
3081 }
3082 
3083 /**
3084  * ab8500_charger_init_hw_registers() - Set up charger related registers
3085  * @di:         pointer to the ab8500_charger structure
3086  *
3087  * Set up charger OVV, watchdog and maximum voltage registers as well as
3088  * charging of the backup battery
3089  */
3090 static int ab8500_charger_init_hw_registers(struct ab8500_charger *di)
3091 {
3092         int ret = 0;
3093         u8 bup_vch_range = 0, vbup33_vrtcn = 0;
3094 
3095         /* Setup maximum charger current and voltage for ABB cut2.0 */
3096         if (!is_ab8500_1p1_or_earlier(di->parent)) {
3097                 ret = abx500_set_register_interruptible(di->dev,
3098                         AB8500_CHARGER,
3099                         AB8500_CH_VOLT_LVL_MAX_REG, CH_VOL_LVL_4P6);
3100                 if (ret) {
3101                         dev_err(di->dev,
3102                                 "failed to set CH_VOLT_LVL_MAX_REG\n");
3103                         goto out;
3104                 }
3105 
3106                 if (is_ab8540(di->parent))
3107                         ret = abx500_set_register_interruptible(di->dev,
3108                                 AB8500_CHARGER, AB8500_CH_OPT_CRNTLVL_MAX_REG,
3109                                 CH_OP_CUR_LVL_2P);
3110                 else
3111                         ret = abx500_set_register_interruptible(di->dev,
3112                                 AB8500_CHARGER, AB8500_CH_OPT_CRNTLVL_MAX_REG,
3113                                 CH_OP_CUR_LVL_1P6);
3114                 if (ret) {
3115                         dev_err(di->dev,
3116                                 "failed to set CH_OPT_CRNTLVL_MAX_REG\n");
3117                         goto out;
3118                 }
3119         }
3120 
3121         if (is_ab9540_2p0(di->parent) || is_ab9540_3p0(di->parent)
3122          || is_ab8505_2p0(di->parent) || is_ab8540(di->parent))
3123                 ret = abx500_mask_and_set_register_interruptible(di->dev,
3124                         AB8500_CHARGER,
3125                         AB8500_USBCH_CTRL2_REG,
3126                         VBUS_AUTO_IN_CURR_LIM_ENA,
3127                         VBUS_AUTO_IN_CURR_LIM_ENA);
3128         else
3129                 /*
3130                  * VBUS OVV set to 6.3V and enable automatic current limitation
3131                  */
3132                 ret = abx500_set_register_interruptible(di->dev,
3133                         AB8500_CHARGER,
3134                         AB8500_USBCH_CTRL2_REG,
3135                         VBUS_OVV_SELECT_6P3V | VBUS_AUTO_IN_CURR_LIM_ENA);
3136         if (ret) {
3137                 dev_err(di->dev,
3138                         "failed to set automatic current limitation\n");
3139                 goto out;
3140         }
3141 
3142         /* Enable main watchdog in OTP */
3143         ret = abx500_set_register_interruptible(di->dev,
3144                 AB8500_OTP_EMUL, AB8500_OTP_CONF_15, OTP_ENABLE_WD);
3145         if (ret) {
3146                 dev_err(di->dev, "failed to enable main WD in OTP\n");
3147                 goto out;
3148         }
3149 
3150         /* Enable main watchdog */
3151         ret = abx500_set_register_interruptible(di->dev,
3152                 AB8500_SYS_CTRL2_BLOCK,
3153                 AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_ENA);
3154         if (ret) {
3155                 dev_err(di->dev, "faile to enable main watchdog\n");
3156                 goto out;
3157         }
3158 
3159         /*
3160          * Due to internal synchronisation, Enable and Kick watchdog bits
3161          * cannot be enabled in a single write.
3162          * A minimum delay of 2*32 kHz period (62.5┬Ás) must be inserted
3163          * between writing Enable then Kick bits.
3164          */
3165         udelay(63);
3166 
3167         /* Kick main watchdog */
3168         ret = abx500_set_register_interruptible(di->dev,
3169                 AB8500_SYS_CTRL2_BLOCK,
3170                 AB8500_MAIN_WDOG_CTRL_REG,
3171                 (MAIN_WDOG_ENA | MAIN_WDOG_KICK));
3172         if (ret) {
3173                 dev_err(di->dev, "failed to kick main watchdog\n");
3174                 goto out;
3175         }
3176 
3177         /* Disable main watchdog */
3178         ret = abx500_set_register_interruptible(di->dev,
3179                 AB8500_SYS_CTRL2_BLOCK,
3180                 AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_DIS);
3181         if (ret) {
3182                 dev_err(di->dev, "failed to disable main watchdog\n");
3183                 goto out;
3184         }
3185 
3186         /* Set watchdog timeout */
3187         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
3188                 AB8500_CH_WD_TIMER_REG, WD_TIMER);
3189         if (ret) {
3190                 dev_err(di->dev, "failed to set charger watchdog timeout\n");
3191                 goto out;
3192         }
3193 
3194         ret = ab8500_charger_led_en(di, false);
3195         if (ret < 0) {
3196                 dev_err(di->dev, "failed to disable LED\n");
3197                 goto out;
3198         }
3199 
3200         /* Backup battery voltage and current */
3201         if (di->bm->bkup_bat_v > BUP_VCH_SEL_3P1V)
3202                 bup_vch_range = BUP_VCH_RANGE;
3203         if (di->bm->bkup_bat_v == BUP_VCH_SEL_3P3V)
3204                 vbup33_vrtcn = VBUP33_VRTCN;
3205 
3206         ret = abx500_set_register_interruptible(di->dev,
3207                 AB8500_RTC,
3208                 AB8500_RTC_BACKUP_CHG_REG,
3209                 (di->bm->bkup_bat_v & 0x3) | di->bm->bkup_bat_i);
3210         if (ret) {
3211                 dev_err(di->dev, "failed to setup backup battery charging\n");
3212                 goto out;
3213         }
3214         if (is_ab8540(di->parent)) {
3215                 ret = abx500_set_register_interruptible(di->dev,
3216                         AB8500_RTC,
3217                         AB8500_RTC_CTRL1_REG,
3218                         bup_vch_range | vbup33_vrtcn);
3219                 if (ret) {
3220                         dev_err(di->dev,
3221                                 "failed to setup backup battery charging\n");
3222                         goto out;
3223                 }
3224         }
3225 
3226         /* Enable backup battery charging */
3227         abx500_mask_and_set_register_interruptible(di->dev,
3228                 AB8500_RTC, AB8500_RTC_CTRL_REG,
3229                 RTC_BUP_CH_ENA, RTC_BUP_CH_ENA);
3230         if (ret < 0)
3231                 dev_err(di->dev, "%s mask and set failed\n", __func__);
3232 
3233         if (is_ab8540(di->parent)) {
3234                 ret = abx500_mask_and_set_register_interruptible(di->dev,
3235                         AB8500_CHARGER, AB8540_USB_PP_MODE_REG,
3236                         BUS_VSYS_VOL_SELECT_MASK, BUS_VSYS_VOL_SELECT_3P6V);
3237                 if (ret) {
3238                         dev_err(di->dev,
3239                                 "failed to setup usb power path vsys voltage\n");
3240                         goto out;
3241                 }
3242                 ret = abx500_mask_and_set_register_interruptible(di->dev,
3243                         AB8500_CHARGER, AB8540_USB_PP_CHR_REG,
3244                         BUS_PP_PRECHG_CURRENT_MASK, 0);
3245                 if (ret) {
3246                         dev_err(di->dev,
3247                                 "failed to setup usb power path prechage current\n");
3248                         goto out;
3249                 }
3250         }
3251 
3252 out:
3253         return ret;
3254 }
3255 
3256 /*
3257  * ab8500 charger driver interrupts and their respective isr
3258  */
3259 static struct ab8500_charger_interrupts ab8500_charger_irq[] = {
3260         {"MAIN_CH_UNPLUG_DET", ab8500_charger_mainchunplugdet_handler},
3261         {"MAIN_CHARGE_PLUG_DET", ab8500_charger_mainchplugdet_handler},
3262         {"MAIN_EXT_CH_NOT_OK", ab8500_charger_mainextchnotok_handler},
3263         {"MAIN_CH_TH_PROT_R", ab8500_charger_mainchthprotr_handler},
3264         {"MAIN_CH_TH_PROT_F", ab8500_charger_mainchthprotf_handler},
3265         {"VBUS_DET_F", ab8500_charger_vbusdetf_handler},
3266         {"VBUS_DET_R", ab8500_charger_vbusdetr_handler},
3267         {"USB_LINK_STATUS", ab8500_charger_usblinkstatus_handler},
3268         {"USB_CH_TH_PROT_R", ab8500_charger_usbchthprotr_handler},
3269         {"USB_CH_TH_PROT_F", ab8500_charger_usbchthprotf_handler},
3270         {"USB_CHARGER_NOT_OKR", ab8500_charger_usbchargernotokr_handler},
3271         {"VBUS_OVV", ab8500_charger_vbusovv_handler},
3272         {"CH_WD_EXP", ab8500_charger_chwdexp_handler},
3273         {"VBUS_CH_DROP_END", ab8500_charger_vbuschdropend_handler},
3274 };
3275 
3276 static int ab8500_charger_usb_notifier_call(struct notifier_block *nb,
3277                 unsigned long event, void *power)
3278 {
3279         struct ab8500_charger *di =
3280                 container_of(nb, struct ab8500_charger, nb);
3281         enum ab8500_usb_state bm_usb_state;
3282         unsigned mA = *((unsigned *)power);
3283 
3284         if (!di)
3285                 return NOTIFY_DONE;
3286 
3287         if (event != USB_EVENT_VBUS) {
3288                 dev_dbg(di->dev, "not a standard host, returning\n");
3289                 return NOTIFY_DONE;
3290         }
3291 
3292         /* TODO: State is fabricate  here. See if charger really needs USB
3293          * state or if mA is enough
3294          */
3295         if ((di->usb_state.usb_current == 2) && (mA > 2))
3296                 bm_usb_state = AB8500_BM_USB_STATE_RESUME;
3297         else if (mA == 0)
3298                 bm_usb_state = AB8500_BM_USB_STATE_RESET_HS;
3299         else if (mA == 2)
3300                 bm_usb_state = AB8500_BM_USB_STATE_SUSPEND;
3301         else if (mA >= 8) /* 8, 100, 500 */
3302                 bm_usb_state = AB8500_BM_USB_STATE_CONFIGURED;
3303         else /* Should never occur */
3304                 bm_usb_state = AB8500_BM_USB_STATE_RESET_FS;
3305 
3306         dev_dbg(di->dev, "%s usb_state: 0x%02x mA: %d\n",
3307                 __func__, bm_usb_state, mA);
3308 
3309         spin_lock(&di->usb_state.usb_lock);
3310         di->usb_state.state_tmp = bm_usb_state;
3311         di->usb_state.usb_current_tmp = mA;
3312         spin_unlock(&di->usb_state.usb_lock);
3313 
3314         /*
3315          * wait for some time until you get updates from the usb stack
3316          * and negotiations are completed
3317          */
3318         queue_delayed_work(di->charger_wq, &di->usb_state_changed_work, HZ/2);
3319 
3320         return NOTIFY_OK;
3321 }
3322 
3323 #if defined(CONFIG_PM)
3324 static int ab8500_charger_resume(struct platform_device *pdev)
3325 {
3326         int ret;
3327         struct ab8500_charger *di = platform_get_drvdata(pdev);
3328 
3329         /*
3330          * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
3331          * logic. That means we have to continously kick the charger
3332          * watchdog even when no charger is connected. This is only
3333          * valid once the AC charger has been enabled. This is
3334          * a bug that is not handled by the algorithm and the
3335          * watchdog have to be kicked by the charger driver
3336          * when the AC charger is disabled
3337          */
3338         if (di->ac_conn && is_ab8500_1p1_or_earlier(di->parent)) {
3339                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
3340                         AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
3341                 if (ret)
3342                         dev_err(di->dev, "Failed to kick WD!\n");
3343 
3344                 /* If not already pending start a new timer */
3345                 queue_delayed_work(di->charger_wq, &di->kick_wd_work,
3346                                    round_jiffies(WD_KICK_INTERVAL));
3347         }
3348 
3349         /* If we still have a HW failure, schedule a new check */
3350         if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
3351                 queue_delayed_work(di->charger_wq,
3352                         &di->check_hw_failure_work, 0);
3353         }
3354 
3355         if (di->flags.vbus_drop_end)
3356                 queue_delayed_work(di->charger_wq, &di->vbus_drop_end_work, 0);
3357 
3358         return 0;
3359 }
3360 
3361 static int ab8500_charger_suspend(struct platform_device *pdev,
3362         pm_message_t state)
3363 {
3364         struct ab8500_charger *di = platform_get_drvdata(pdev);
3365 
3366         /* Cancel any pending jobs */
3367         cancel_delayed_work(&di->check_hw_failure_work);
3368         cancel_delayed_work(&di->vbus_drop_end_work);
3369 
3370         flush_delayed_work(&di->attach_work);
3371         flush_delayed_work(&di->usb_charger_attached_work);
3372         flush_delayed_work(&di->ac_charger_attached_work);
3373         flush_delayed_work(&di->check_usbchgnotok_work);
3374         flush_delayed_work(&di->check_vbat_work);
3375         flush_delayed_work(&di->kick_wd_work);
3376 
3377         flush_work(&di->usb_link_status_work);
3378         flush_work(&di->ac_work);
3379         flush_work(&di->detect_usb_type_work);
3380 
3381         if (atomic_read(&di->current_stepping_sessions))
3382                 return -EAGAIN;
3383 
3384         return 0;
3385 }
3386 #else
3387 #define ab8500_charger_suspend      NULL
3388 #define ab8500_charger_resume       NULL
3389 #endif
3390 
3391 static struct notifier_block charger_nb = {
3392         .notifier_call = ab8500_external_charger_prepare,
3393 };
3394 
3395 static int ab8500_charger_remove(struct platform_device *pdev)
3396 {
3397         struct ab8500_charger *di = platform_get_drvdata(pdev);
3398         int i, irq, ret;
3399 
3400         /* Disable AC charging */
3401         ab8500_charger_ac_en(&di->ac_chg, false, 0, 0);
3402 
3403         /* Disable USB charging */
3404         ab8500_charger_usb_en(&di->usb_chg, false, 0, 0);
3405 
3406         /* Disable interrupts */
3407         for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
3408                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3409                 free_irq(irq, di);
3410         }
3411 
3412         /* Backup battery voltage and current disable */
3413         ret = abx500_mask_and_set_register_interruptible(di->dev,
3414                 AB8500_RTC, AB8500_RTC_CTRL_REG, RTC_BUP_CH_ENA, 0);
3415         if (ret < 0)
3416                 dev_err(di->dev, "%s mask and set failed\n", __func__);
3417 
3418         usb_unregister_notifier(di->usb_phy, &di->nb);
3419         usb_put_phy(di->usb_phy);
3420 
3421         /* Delete the work queue */
3422         destroy_workqueue(di->charger_wq);
3423 
3424         /* Unregister external charger enable notifier */
3425         if (!di->ac_chg.enabled)
3426                 blocking_notifier_chain_unregister(
3427                         &charger_notifier_list, &charger_nb);
3428 
3429         flush_scheduled_work();
3430         if (di->usb_chg.enabled)
3431                 power_supply_unregister(&di->usb_chg.psy);
3432 
3433         if (di->ac_chg.enabled && !di->ac_chg.external)
3434                 power_supply_unregister(&di->ac_chg.psy);
3435 
3436         return 0;
3437 }
3438 
3439 static char *supply_interface[] = {
3440         "ab8500_chargalg",
3441         "ab8500_fg",
3442         "ab8500_btemp",
3443 };
3444 
3445 static int ab8500_charger_probe(struct platform_device *pdev)
3446 {
3447         struct device_node *np = pdev->dev.of_node;
3448         struct abx500_bm_data *plat = pdev->dev.platform_data;
3449         struct ab8500_charger *di;
3450         int irq, i, charger_status, ret = 0, ch_stat;
3451 
3452         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
3453         if (!di) {
3454                 dev_err(&pdev->dev, "%s no mem for ab8500_charger\n", __func__);
3455                 return -ENOMEM;
3456         }
3457 
3458         if (!plat) {
3459                 dev_err(&pdev->dev, "no battery management data supplied\n");
3460                 return -EINVAL;
3461         }
3462         di->bm = plat;
3463 
3464         if (np) {
3465                 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
3466                 if (ret) {
3467                         dev_err(&pdev->dev, "failed to get battery information\n");
3468                         return ret;
3469                 }
3470                 di->autopower_cfg = of_property_read_bool(np, "autopower_cfg");
3471         } else
3472                 di->autopower_cfg = false;
3473 
3474         /* get parent data */
3475         di->dev = &pdev->dev;
3476         di->parent = dev_get_drvdata(pdev->dev.parent);
3477         di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
3478 
3479         /* initialize lock */
3480         spin_lock_init(&di->usb_state.usb_lock);
3481         mutex_init(&di->usb_ipt_crnt_lock);
3482 
3483         di->autopower = false;
3484         di->invalid_charger_detect_state = 0;
3485 
3486         /* AC supply */
3487         /* power_supply base class */
3488         di->ac_chg.psy.name = "ab8500_ac";
3489         di->ac_chg.psy.type = POWER_SUPPLY_TYPE_MAINS;
3490         di->ac_chg.psy.properties = ab8500_charger_ac_props;
3491         di->ac_chg.psy.num_properties = ARRAY_SIZE(ab8500_charger_ac_props);
3492         di->ac_chg.psy.get_property = ab8500_charger_ac_get_property;
3493         di->ac_chg.psy.supplied_to = supply_interface;
3494         di->ac_chg.psy.num_supplicants = ARRAY_SIZE(supply_interface),
3495         /* ux500_charger sub-class */
3496         di->ac_chg.ops.enable = &ab8500_charger_ac_en;
3497         di->ac_chg.ops.check_enable = &ab8500_charger_ac_check_enable;
3498         di->ac_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
3499         di->ac_chg.ops.update_curr = &ab8500_charger_update_charger_current;
3500         di->ac_chg.max_out_volt = ab8500_charger_voltage_map[
3501                 ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
3502         di->ac_chg.max_out_curr =
3503                 di->bm->chg_output_curr[di->bm->n_chg_out_curr - 1];
3504         di->ac_chg.wdt_refresh = CHG_WD_INTERVAL;
3505         di->ac_chg.enabled = di->bm->ac_enabled;
3506         di->ac_chg.external = false;
3507 
3508         /*notifier for external charger enabling*/
3509         if (!di->ac_chg.enabled)
3510                 blocking_notifier_chain_register(
3511                         &charger_notifier_list, &charger_nb);
3512 
3513         /* USB supply */
3514         /* power_supply base class */
3515         di->usb_chg.psy.name = "ab8500_usb";
3516         di->usb_chg.psy.type = POWER_SUPPLY_TYPE_USB;
3517         di->usb_chg.psy.properties = ab8500_charger_usb_props;
3518         di->usb_chg.psy.num_properties = ARRAY_SIZE(ab8500_charger_usb_props);
3519         di->usb_chg.psy.get_property = ab8500_charger_usb_get_property;
3520         di->usb_chg.psy.supplied_to = supply_interface;
3521         di->usb_chg.psy.num_supplicants = ARRAY_SIZE(supply_interface),
3522         /* ux500_charger sub-class */
3523         di->usb_chg.ops.enable = &ab8500_charger_usb_en;
3524         di->usb_chg.ops.check_enable = &ab8500_charger_usb_check_enable;
3525         di->usb_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
3526         di->usb_chg.ops.update_curr = &ab8500_charger_update_charger_current;
3527         di->usb_chg.ops.pp_enable = &ab8540_charger_power_path_enable;
3528         di->usb_chg.ops.pre_chg_enable = &ab8540_charger_usb_pre_chg_enable;
3529         di->usb_chg.max_out_volt = ab8500_charger_voltage_map[
3530                 ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
3531         di->usb_chg.max_out_curr =
3532                 di->bm->chg_output_curr[di->bm->n_chg_out_curr - 1];
3533         di->usb_chg.wdt_refresh = CHG_WD_INTERVAL;
3534         di->usb_chg.enabled = di->bm->usb_enabled;
3535         di->usb_chg.external = false;
3536         di->usb_chg.power_path = di->bm->usb_power_path;
3537         di->usb_state.usb_current = -1;
3538 
3539         /* Create a work queue for the charger */
3540         di->charger_wq =
3541                 create_singlethread_workqueue("ab8500_charger_wq");
3542         if (di->charger_wq == NULL) {
3543                 dev_err(di->dev, "failed to create work queue\n");
3544                 return -ENOMEM;
3545         }
3546 
3547         mutex_init(&di->charger_attached_mutex);
3548 
3549         /* Init work for HW failure check */
3550         INIT_DEFERRABLE_WORK(&di->check_hw_failure_work,
3551                 ab8500_charger_check_hw_failure_work);
3552         INIT_DEFERRABLE_WORK(&di->check_usbchgnotok_work,
3553                 ab8500_charger_check_usbchargernotok_work);
3554 
3555         INIT_DELAYED_WORK(&di->ac_charger_attached_work,
3556                           ab8500_charger_ac_attached_work);
3557         INIT_DELAYED_WORK(&di->usb_charger_attached_work,
3558                           ab8500_charger_usb_attached_work);
3559 
3560         /*
3561          * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
3562          * logic. That means we have to continously kick the charger
3563          * watchdog even when no charger is connected. This is only
3564          * valid once the AC charger has been enabled. This is
3565          * a bug that is not handled by the algorithm and the
3566          * watchdog have to be kicked by the charger driver
3567          * when the AC charger is disabled
3568          */
3569         INIT_DEFERRABLE_WORK(&di->kick_wd_work,
3570                 ab8500_charger_kick_watchdog_work);
3571 
3572         INIT_DEFERRABLE_WORK(&di->check_vbat_work,
3573                 ab8500_charger_check_vbat_work);
3574 
3575         INIT_DELAYED_WORK(&di->attach_work,
3576                 ab8500_charger_usb_link_attach_work);
3577 
3578         INIT_DELAYED_WORK(&di->usb_state_changed_work,
3579                 ab8500_charger_usb_state_changed_work);
3580 
3581         INIT_DELAYED_WORK(&di->vbus_drop_end_work,
3582                 ab8500_charger_vbus_drop_end_work);
3583 
3584         /* Init work for charger detection */
3585         INIT_WORK(&di->usb_link_status_work,
3586                 ab8500_charger_usb_link_status_work);
3587         INIT_WORK(&di->ac_work, ab8500_charger_ac_work);
3588         INIT_WORK(&di->detect_usb_type_work,
3589                 ab8500_charger_detect_usb_type_work);
3590 
3591         /* Init work for checking HW status */
3592         INIT_WORK(&di->check_main_thermal_prot_work,
3593                 ab8500_charger_check_main_thermal_prot_work);
3594         INIT_WORK(&di->check_usb_thermal_prot_work,
3595                 ab8500_charger_check_usb_thermal_prot_work);
3596 
3597         /*
3598          * VDD ADC supply needs to be enabled from this driver when there
3599          * is a charger connected to avoid erroneous BTEMP_HIGH/LOW
3600          * interrupts during charging
3601          */
3602         di->regu = devm_regulator_get(di->dev, "vddadc");
3603         if (IS_ERR(di->regu)) {
3604                 ret = PTR_ERR(di->regu);
3605                 dev_err(di->dev, "failed to get vddadc regulator\n");
3606                 goto free_charger_wq;
3607         }
3608 
3609 
3610         /* Initialize OVV, and other registers */
3611         ret = ab8500_charger_init_hw_registers(di);
3612         if (ret) {
3613                 dev_err(di->dev, "failed to initialize ABB registers\n");
3614                 goto free_charger_wq;
3615         }
3616 
3617         /* Register AC charger class */
3618         if (di->ac_chg.enabled) {
3619                 ret = power_supply_register(di->dev, &di->ac_chg.psy);
3620                 if (ret) {
3621                         dev_err(di->dev, "failed to register AC charger\n");
3622                         goto free_charger_wq;
3623                 }
3624         }
3625 
3626         /* Register USB charger class */
3627         if (di->usb_chg.enabled) {
3628                 ret = power_supply_register(di->dev, &di->usb_chg.psy);
3629                 if (ret) {
3630                         dev_err(di->dev, "failed to register USB charger\n");
3631                         goto free_ac;
3632                 }
3633         }
3634 
3635         di->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
3636         if (IS_ERR_OR_NULL(di->usb_phy)) {
3637                 dev_err(di->dev, "failed to get usb transceiver\n");
3638                 ret = -EINVAL;
3639                 goto free_usb;
3640         }
3641         di->nb.notifier_call = ab8500_charger_usb_notifier_call;
3642         ret = usb_register_notifier(di->usb_phy, &di->nb);
3643         if (ret) {
3644                 dev_err(di->dev, "failed to register usb notifier\n");
3645                 goto put_usb_phy;
3646         }
3647 
3648         /* Identify the connected charger types during startup */
3649         charger_status = ab8500_charger_detect_chargers(di, true);
3650         if (charger_status & AC_PW_CONN) {
3651                 di->ac.charger_connected = 1;
3652                 di->ac_conn = true;
3653                 ab8500_power_supply_changed(di, &di->ac_chg.psy);
3654                 sysfs_notify(&di->ac_chg.psy.dev->kobj, NULL, "present");
3655         }
3656 
3657         if (charger_status & USB_PW_CONN) {
3658                 di->vbus_detected = true;
3659                 di->vbus_detected_start = true;
3660                 queue_work(di->charger_wq,
3661                         &di->detect_usb_type_work);
3662         }
3663 
3664         /* Register interrupts */
3665         for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
3666                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3667                 ret = request_threaded_irq(irq, NULL, ab8500_charger_irq[i].isr,
3668                         IRQF_SHARED | IRQF_NO_SUSPEND,
3669                         ab8500_charger_irq[i].name, di);
3670 
3671                 if (ret != 0) {
3672                         dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
3673                                 , ab8500_charger_irq[i].name, irq, ret);
3674                         goto free_irq;
3675                 }
3676                 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
3677                         ab8500_charger_irq[i].name, irq, ret);
3678         }
3679 
3680         platform_set_drvdata(pdev, di);
3681 
3682         mutex_lock(&di->charger_attached_mutex);
3683 
3684         ch_stat = ab8500_charger_detect_chargers(di, false);
3685 
3686         if ((ch_stat & AC_PW_CONN) == AC_PW_CONN) {
3687                 if (is_ab8500(di->parent))
3688                         queue_delayed_work(di->charger_wq,
3689                                            &di->ac_charger_attached_work,
3690                                            HZ);
3691         }
3692         if ((ch_stat & USB_PW_CONN) == USB_PW_CONN) {
3693                 if (is_ab8500(di->parent))
3694                         queue_delayed_work(di->charger_wq,
3695                                            &di->usb_charger_attached_work,
3696                                            HZ);
3697         }
3698 
3699         mutex_unlock(&di->charger_attached_mutex);
3700 
3701         return ret;
3702 
3703 free_irq:
3704         usb_unregister_notifier(di->usb_phy, &di->nb);
3705 
3706         /* We also have to free all successfully registered irqs */
3707         for (i = i - 1; i >= 0; i--) {
3708                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3709                 free_irq(irq, di);
3710         }
3711 put_usb_phy:
3712         usb_put_phy(di->usb_phy);
3713 free_usb:
3714         if (di->usb_chg.enabled)
3715                 power_supply_unregister(&di->usb_chg.psy);
3716 free_ac:
3717         if (di->ac_chg.enabled)
3718                 power_supply_unregister(&di->ac_chg.psy);
3719 free_charger_wq:
3720         destroy_workqueue(di->charger_wq);
3721         return ret;
3722 }
3723 
3724 static const struct of_device_id ab8500_charger_match[] = {
3725         { .compatible = "stericsson,ab8500-charger", },
3726         { },
3727 };
3728 
3729 static struct platform_driver ab8500_charger_driver = {
3730         .probe = ab8500_charger_probe,
3731         .remove = ab8500_charger_remove,
3732         .suspend = ab8500_charger_suspend,
3733         .resume = ab8500_charger_resume,
3734         .driver = {
3735                 .name = "ab8500-charger",
3736                 .owner = THIS_MODULE,
3737                 .of_match_table = ab8500_charger_match,
3738         },
3739 };
3740 
3741 static int __init ab8500_charger_init(void)
3742 {
3743         return platform_driver_register(&ab8500_charger_driver);
3744 }
3745 
3746 static void __exit ab8500_charger_exit(void)
3747 {
3748         platform_driver_unregister(&ab8500_charger_driver);
3749 }
3750 
3751 subsys_initcall_sync(ab8500_charger_init);
3752 module_exit(ab8500_charger_exit);
3753 
3754 MODULE_LICENSE("GPL v2");
3755 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
3756 MODULE_ALIAS("platform:ab8500-charger");
3757 MODULE_DESCRIPTION("AB8500 charger management driver");
3758 

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