Version:  2.0.40 2.2.26 2.4.37 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 3.16 3.17 3.18

Linux/drivers/power/twl4030_charger.c

  1 /*
  2  * TWL4030/TPS65950 BCI (Battery Charger Interface) driver
  3  *
  4  * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com>
  5  *
  6  * based on twl4030_bci_battery.c by TI
  7  * Copyright (C) 2008 Texas Instruments, Inc.
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License as published by
 11  * the Free Software Foundation; either version 2 of the License, or
 12  * (at your option) any later version.
 13  */
 14 
 15 #include <linux/init.h>
 16 #include <linux/module.h>
 17 #include <linux/slab.h>
 18 #include <linux/err.h>
 19 #include <linux/platform_device.h>
 20 #include <linux/interrupt.h>
 21 #include <linux/i2c/twl.h>
 22 #include <linux/power_supply.h>
 23 #include <linux/notifier.h>
 24 #include <linux/usb/otg.h>
 25 #include <linux/regulator/machine.h>
 26 
 27 #define TWL4030_BCIMSTATEC      0x02
 28 #define TWL4030_BCIICHG         0x08
 29 #define TWL4030_BCIVAC          0x0a
 30 #define TWL4030_BCIVBUS         0x0c
 31 #define TWL4030_BCIMFSTS3       0x0F
 32 #define TWL4030_BCIMFSTS4       0x10
 33 #define TWL4030_BCICTL1         0x23
 34 #define TWL4030_BB_CFG          0x12
 35 
 36 #define TWL4030_BCIMFSTS1       0x01
 37 
 38 #define TWL4030_BCIAUTOWEN      BIT(5)
 39 #define TWL4030_CONFIG_DONE     BIT(4)
 40 #define TWL4030_BCIAUTOUSB      BIT(1)
 41 #define TWL4030_BCIAUTOAC       BIT(0)
 42 #define TWL4030_CGAIN           BIT(5)
 43 #define TWL4030_USBFASTMCHG     BIT(2)
 44 #define TWL4030_STS_VBUS        BIT(7)
 45 #define TWL4030_STS_USB_ID      BIT(2)
 46 #define TWL4030_BBCHEN          BIT(4)
 47 #define TWL4030_BBSEL_MASK      0x0c
 48 #define TWL4030_BBSEL_2V5       0x00
 49 #define TWL4030_BBSEL_3V0       0x04
 50 #define TWL4030_BBSEL_3V1       0x08
 51 #define TWL4030_BBSEL_3V2       0x0c
 52 #define TWL4030_BBISEL_MASK     0x03
 53 #define TWL4030_BBISEL_25uA     0x00
 54 #define TWL4030_BBISEL_150uA    0x01
 55 #define TWL4030_BBISEL_500uA    0x02
 56 #define TWL4030_BBISEL_1000uA   0x03
 57 
 58 #define TWL4030_BATSTSPCHG      BIT(2)
 59 #define TWL4030_BATSTSMCHG      BIT(6)
 60 
 61 /* BCI interrupts */
 62 #define TWL4030_WOVF            BIT(0) /* Watchdog overflow */
 63 #define TWL4030_TMOVF           BIT(1) /* Timer overflow */
 64 #define TWL4030_ICHGHIGH        BIT(2) /* Battery charge current high */
 65 #define TWL4030_ICHGLOW         BIT(3) /* Battery cc. low / FSM state change */
 66 #define TWL4030_ICHGEOC         BIT(4) /* Battery current end-of-charge */
 67 #define TWL4030_TBATOR2         BIT(5) /* Battery temperature out of range 2 */
 68 #define TWL4030_TBATOR1         BIT(6) /* Battery temperature out of range 1 */
 69 #define TWL4030_BATSTS          BIT(7) /* Battery status */
 70 
 71 #define TWL4030_VBATLVL         BIT(0) /* VBAT level */
 72 #define TWL4030_VBATOV          BIT(1) /* VBAT overvoltage */
 73 #define TWL4030_VBUSOV          BIT(2) /* VBUS overvoltage */
 74 #define TWL4030_ACCHGOV         BIT(3) /* Ac charger overvoltage */
 75 
 76 #define TWL4030_MSTATEC_USB             BIT(4)
 77 #define TWL4030_MSTATEC_AC              BIT(5)
 78 #define TWL4030_MSTATEC_MASK            0x0f
 79 #define TWL4030_MSTATEC_QUICK1          0x02
 80 #define TWL4030_MSTATEC_QUICK7          0x07
 81 #define TWL4030_MSTATEC_COMPLETE1       0x0b
 82 #define TWL4030_MSTATEC_COMPLETE4       0x0e
 83 
 84 static bool allow_usb;
 85 module_param(allow_usb, bool, 0644);
 86 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
 87 
 88 struct twl4030_bci {
 89         struct device           *dev;
 90         struct power_supply     ac;
 91         struct power_supply     usb;
 92         struct usb_phy          *transceiver;
 93         struct notifier_block   usb_nb;
 94         struct work_struct      work;
 95         int                     irq_chg;
 96         int                     irq_bci;
 97         struct regulator        *usb_reg;
 98         int                     usb_enabled;
 99 
100         unsigned long           event;
101 };
102 
103 /*
104  * clear and set bits on an given register on a given module
105  */
106 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
107 {
108         u8 val = 0;
109         int ret;
110 
111         ret = twl_i2c_read_u8(mod_no, &val, reg);
112         if (ret)
113                 return ret;
114 
115         val &= ~clear;
116         val |= set;
117 
118         return twl_i2c_write_u8(mod_no, val, reg);
119 }
120 
121 static int twl4030_bci_read(u8 reg, u8 *val)
122 {
123         return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
124 }
125 
126 static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
127 {
128         return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
129                         TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
130                         TWL4030_PM_MASTER_BOOT_BCI);
131 }
132 
133 static int twl4030bci_read_adc_val(u8 reg)
134 {
135         int ret, temp;
136         u8 val;
137 
138         /* read MSB */
139         ret = twl4030_bci_read(reg + 1, &val);
140         if (ret)
141                 return ret;
142 
143         temp = (int)(val & 0x03) << 8;
144 
145         /* read LSB */
146         ret = twl4030_bci_read(reg, &val);
147         if (ret)
148                 return ret;
149 
150         return temp | val;
151 }
152 
153 /*
154  * Check if Battery Pack was present
155  */
156 static int twl4030_is_battery_present(struct twl4030_bci *bci)
157 {
158         int ret;
159         u8 val = 0;
160 
161         /* Battery presence in Main charge? */
162         ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, TWL4030_BCIMFSTS3);
163         if (ret)
164                 return ret;
165         if (val & TWL4030_BATSTSMCHG)
166                 return 0;
167 
168         /*
169          * OK, It could be that bootloader did not enable main charger,
170          * pre-charge is h/w auto. So, Battery presence in Pre-charge?
171          */
172         ret = twl_i2c_read_u8(TWL4030_MODULE_PRECHARGE, &val,
173                               TWL4030_BCIMFSTS1);
174         if (ret)
175                 return ret;
176         if (val & TWL4030_BATSTSPCHG)
177                 return 0;
178 
179         return -ENODEV;
180 }
181 
182 /*
183  * Check if VBUS power is present
184  */
185 static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
186 {
187         int ret;
188         u8 hwsts;
189 
190         ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &hwsts,
191                               TWL4030_PM_MASTER_STS_HW_CONDITIONS);
192         if (ret < 0)
193                 return 0;
194 
195         dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
196 
197         /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
198         if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
199                 return 1;
200 
201         return 0;
202 }
203 
204 /*
205  * Enable/Disable USB Charge functionality.
206  */
207 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
208 {
209         int ret;
210 
211         if (enable) {
212                 /* Check for USB charger connected */
213                 if (!twl4030_bci_have_vbus(bci))
214                         return -ENODEV;
215 
216                 /*
217                  * Until we can find out what current the device can provide,
218                  * require a module param to enable USB charging.
219                  */
220                 if (!allow_usb) {
221                         dev_warn(bci->dev, "USB charging is disabled.\n");
222                         return -EACCES;
223                 }
224 
225                 /* Need to keep regulator on */
226                 if (!bci->usb_enabled) {
227                         ret = regulator_enable(bci->usb_reg);
228                         if (ret) {
229                                 dev_err(bci->dev,
230                                         "Failed to enable regulator\n");
231                                 return ret;
232                         }
233                         bci->usb_enabled = 1;
234                 }
235 
236                 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
237                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
238                 if (ret < 0)
239                         return ret;
240 
241                 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
242                 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
243                         TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
244         } else {
245                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
246                 if (bci->usb_enabled) {
247                         regulator_disable(bci->usb_reg);
248                         bci->usb_enabled = 0;
249                 }
250         }
251 
252         return ret;
253 }
254 
255 /*
256  * Enable/Disable AC Charge funtionality.
257  */
258 static int twl4030_charger_enable_ac(bool enable)
259 {
260         int ret;
261 
262         if (enable)
263                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
264         else
265                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
266 
267         return ret;
268 }
269 
270 /*
271  * Enable/Disable charging of Backup Battery.
272  */
273 static int twl4030_charger_enable_backup(int uvolt, int uamp)
274 {
275         int ret;
276         u8 flags;
277 
278         if (uvolt < 2500000 ||
279             uamp < 25) {
280                 /* disable charging of backup battery */
281                 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
282                                         TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
283                 return ret;
284         }
285 
286         flags = TWL4030_BBCHEN;
287         if (uvolt >= 3200000)
288                 flags |= TWL4030_BBSEL_3V2;
289         else if (uvolt >= 3100000)
290                 flags |= TWL4030_BBSEL_3V1;
291         else if (uvolt >= 3000000)
292                 flags |= TWL4030_BBSEL_3V0;
293         else
294                 flags |= TWL4030_BBSEL_2V5;
295 
296         if (uamp >= 1000)
297                 flags |= TWL4030_BBISEL_1000uA;
298         else if (uamp >= 500)
299                 flags |= TWL4030_BBISEL_500uA;
300         else if (uamp >= 150)
301                 flags |= TWL4030_BBISEL_150uA;
302         else
303                 flags |= TWL4030_BBISEL_25uA;
304 
305         ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
306                                 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
307                                 flags,
308                                 TWL4030_BB_CFG);
309 
310         return ret;
311 }
312 
313 /*
314  * TWL4030 CHG_PRES (AC charger presence) events
315  */
316 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
317 {
318         struct twl4030_bci *bci = arg;
319 
320         dev_dbg(bci->dev, "CHG_PRES irq\n");
321         power_supply_changed(&bci->ac);
322         power_supply_changed(&bci->usb);
323 
324         return IRQ_HANDLED;
325 }
326 
327 /*
328  * TWL4030 BCI monitoring events
329  */
330 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
331 {
332         struct twl4030_bci *bci = arg;
333         u8 irqs1, irqs2;
334         int ret;
335 
336         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
337                               TWL4030_INTERRUPTS_BCIISR1A);
338         if (ret < 0)
339                 return IRQ_HANDLED;
340 
341         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
342                               TWL4030_INTERRUPTS_BCIISR2A);
343         if (ret < 0)
344                 return IRQ_HANDLED;
345 
346         dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
347 
348         if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
349                 /* charger state change, inform the core */
350                 power_supply_changed(&bci->ac);
351                 power_supply_changed(&bci->usb);
352         }
353 
354         /* various monitoring events, for now we just log them here */
355         if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
356                 dev_warn(bci->dev, "battery temperature out of range\n");
357 
358         if (irqs1 & TWL4030_BATSTS)
359                 dev_crit(bci->dev, "battery disconnected\n");
360 
361         if (irqs2 & TWL4030_VBATOV)
362                 dev_crit(bci->dev, "VBAT overvoltage\n");
363 
364         if (irqs2 & TWL4030_VBUSOV)
365                 dev_crit(bci->dev, "VBUS overvoltage\n");
366 
367         if (irqs2 & TWL4030_ACCHGOV)
368                 dev_crit(bci->dev, "Ac charger overvoltage\n");
369 
370         return IRQ_HANDLED;
371 }
372 
373 static void twl4030_bci_usb_work(struct work_struct *data)
374 {
375         struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
376 
377         switch (bci->event) {
378         case USB_EVENT_VBUS:
379         case USB_EVENT_CHARGER:
380                 twl4030_charger_enable_usb(bci, true);
381                 break;
382         case USB_EVENT_NONE:
383                 twl4030_charger_enable_usb(bci, false);
384                 break;
385         }
386 }
387 
388 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
389                                void *priv)
390 {
391         struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
392 
393         dev_dbg(bci->dev, "OTG notify %lu\n", val);
394 
395         bci->event = val;
396         schedule_work(&bci->work);
397 
398         return NOTIFY_OK;
399 }
400 
401 /*
402  * TI provided formulas:
403  * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
404  * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
405  * Here we use integer approximation of:
406  * CGAIN == 0: val * 1.6618 - 0.85
407  * CGAIN == 1: (val * 1.6618 - 0.85) * 2
408  */
409 static int twl4030_charger_get_current(void)
410 {
411         int curr;
412         int ret;
413         u8 bcictl1;
414 
415         curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
416         if (curr < 0)
417                 return curr;
418 
419         ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
420         if (ret)
421                 return ret;
422 
423         ret = (curr * 16618 - 850 * 10000) / 10;
424         if (bcictl1 & TWL4030_CGAIN)
425                 ret *= 2;
426 
427         return ret;
428 }
429 
430 /*
431  * Returns the main charge FSM state
432  * Or < 0 on failure.
433  */
434 static int twl4030bci_state(struct twl4030_bci *bci)
435 {
436         int ret;
437         u8 state;
438 
439         ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
440         if (ret) {
441                 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
442                 return ret;
443         }
444 
445         dev_dbg(bci->dev, "state: %02x\n", state);
446 
447         return state;
448 }
449 
450 static int twl4030_bci_state_to_status(int state)
451 {
452         state &= TWL4030_MSTATEC_MASK;
453         if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
454                 return POWER_SUPPLY_STATUS_CHARGING;
455         else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
456                                         state <= TWL4030_MSTATEC_COMPLETE4)
457                 return POWER_SUPPLY_STATUS_FULL;
458         else
459                 return POWER_SUPPLY_STATUS_NOT_CHARGING;
460 }
461 
462 static int twl4030_bci_get_property(struct power_supply *psy,
463                                     enum power_supply_property psp,
464                                     union power_supply_propval *val)
465 {
466         struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
467         int is_charging;
468         int state;
469         int ret;
470 
471         state = twl4030bci_state(bci);
472         if (state < 0)
473                 return state;
474 
475         if (psy->type == POWER_SUPPLY_TYPE_USB)
476                 is_charging = state & TWL4030_MSTATEC_USB;
477         else
478                 is_charging = state & TWL4030_MSTATEC_AC;
479 
480         switch (psp) {
481         case POWER_SUPPLY_PROP_STATUS:
482                 if (is_charging)
483                         val->intval = twl4030_bci_state_to_status(state);
484                 else
485                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
486                 break;
487         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
488                 /* charging must be active for meaningful result */
489                 if (!is_charging)
490                         return -ENODATA;
491                 if (psy->type == POWER_SUPPLY_TYPE_USB) {
492                         ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
493                         if (ret < 0)
494                                 return ret;
495                         /* BCIVBUS uses ADCIN8, 7/1023 V/step */
496                         val->intval = ret * 6843;
497                 } else {
498                         ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
499                         if (ret < 0)
500                                 return ret;
501                         /* BCIVAC uses ADCIN11, 10/1023 V/step */
502                         val->intval = ret * 9775;
503                 }
504                 break;
505         case POWER_SUPPLY_PROP_CURRENT_NOW:
506                 if (!is_charging)
507                         return -ENODATA;
508                 /* current measurement is shared between AC and USB */
509                 ret = twl4030_charger_get_current();
510                 if (ret < 0)
511                         return ret;
512                 val->intval = ret;
513                 break;
514         case POWER_SUPPLY_PROP_ONLINE:
515                 val->intval = is_charging &&
516                         twl4030_bci_state_to_status(state) !=
517                                 POWER_SUPPLY_STATUS_NOT_CHARGING;
518                 break;
519         default:
520                 return -EINVAL;
521         }
522 
523         return 0;
524 }
525 
526 static enum power_supply_property twl4030_charger_props[] = {
527         POWER_SUPPLY_PROP_STATUS,
528         POWER_SUPPLY_PROP_ONLINE,
529         POWER_SUPPLY_PROP_VOLTAGE_NOW,
530         POWER_SUPPLY_PROP_CURRENT_NOW,
531 };
532 
533 #ifdef CONFIG_OF
534 static const struct twl4030_bci_platform_data *
535 twl4030_bci_parse_dt(struct device *dev)
536 {
537         struct device_node *np = dev->of_node;
538         struct twl4030_bci_platform_data *pdata;
539         u32 num;
540 
541         if (!np)
542                 return NULL;
543         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
544         if (!pdata)
545                 return pdata;
546 
547         if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
548                 pdata->bb_uvolt = num;
549         if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
550                 pdata->bb_uamp = num;
551         return pdata;
552 }
553 #else
554 static inline const struct twl4030_bci_platform_data *
555 twl4030_bci_parse_dt(struct device *dev)
556 {
557         return NULL;
558 }
559 #endif
560 
561 static int __init twl4030_bci_probe(struct platform_device *pdev)
562 {
563         struct twl4030_bci *bci;
564         const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
565         int ret;
566         u32 reg;
567 
568         bci = kzalloc(sizeof(*bci), GFP_KERNEL);
569         if (bci == NULL)
570                 return -ENOMEM;
571 
572         if (!pdata)
573                 pdata = twl4030_bci_parse_dt(&pdev->dev);
574 
575         bci->dev = &pdev->dev;
576         bci->irq_chg = platform_get_irq(pdev, 0);
577         bci->irq_bci = platform_get_irq(pdev, 1);
578 
579         /* Only proceed further *IF* battery is physically present */
580         ret = twl4030_is_battery_present(bci);
581         if  (ret) {
582                 dev_crit(&pdev->dev, "Battery was not detected:%d\n", ret);
583                 goto fail_no_battery;
584         }
585 
586         platform_set_drvdata(pdev, bci);
587         bci->ac.name = "twl4030_ac";
588         bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
589         bci->ac.properties = twl4030_charger_props;
590         bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
591         bci->ac.get_property = twl4030_bci_get_property;
592 
593         ret = power_supply_register(&pdev->dev, &bci->ac);
594         if (ret) {
595                 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
596                 goto fail_register_ac;
597         }
598 
599         bci->usb.name = "twl4030_usb";
600         bci->usb.type = POWER_SUPPLY_TYPE_USB;
601         bci->usb.properties = twl4030_charger_props;
602         bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
603         bci->usb.get_property = twl4030_bci_get_property;
604 
605         bci->usb_reg = regulator_get(bci->dev, "bci3v1");
606 
607         ret = power_supply_register(&pdev->dev, &bci->usb);
608         if (ret) {
609                 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
610                 goto fail_register_usb;
611         }
612 
613         ret = request_threaded_irq(bci->irq_chg, NULL,
614                         twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
615                         bci);
616         if (ret < 0) {
617                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
618                         bci->irq_chg, ret);
619                 goto fail_chg_irq;
620         }
621 
622         ret = request_threaded_irq(bci->irq_bci, NULL,
623                         twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
624         if (ret < 0) {
625                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
626                         bci->irq_bci, ret);
627                 goto fail_bci_irq;
628         }
629 
630         INIT_WORK(&bci->work, twl4030_bci_usb_work);
631 
632         bci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
633         if (!IS_ERR_OR_NULL(bci->transceiver)) {
634                 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
635                 usb_register_notifier(bci->transceiver, &bci->usb_nb);
636         }
637 
638         /* Enable interrupts now. */
639         reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
640                 TWL4030_TBATOR1 | TWL4030_BATSTS);
641         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
642                                TWL4030_INTERRUPTS_BCIIMR1A);
643         if (ret < 0) {
644                 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
645                 goto fail_unmask_interrupts;
646         }
647 
648         reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
649         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
650                                TWL4030_INTERRUPTS_BCIIMR2A);
651         if (ret < 0)
652                 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
653 
654         twl4030_charger_enable_ac(true);
655         twl4030_charger_enable_usb(bci, true);
656         if (pdata)
657                 twl4030_charger_enable_backup(pdata->bb_uvolt,
658                                               pdata->bb_uamp);
659         else
660                 twl4030_charger_enable_backup(0, 0);
661 
662         return 0;
663 
664 fail_unmask_interrupts:
665         if (!IS_ERR_OR_NULL(bci->transceiver)) {
666                 usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
667                 usb_put_phy(bci->transceiver);
668         }
669         free_irq(bci->irq_bci, bci);
670 fail_bci_irq:
671         free_irq(bci->irq_chg, bci);
672 fail_chg_irq:
673         power_supply_unregister(&bci->usb);
674 fail_register_usb:
675         power_supply_unregister(&bci->ac);
676 fail_register_ac:
677 fail_no_battery:
678         kfree(bci);
679 
680         return ret;
681 }
682 
683 static int __exit twl4030_bci_remove(struct platform_device *pdev)
684 {
685         struct twl4030_bci *bci = platform_get_drvdata(pdev);
686 
687         twl4030_charger_enable_ac(false);
688         twl4030_charger_enable_usb(bci, false);
689         twl4030_charger_enable_backup(0, 0);
690 
691         /* mask interrupts */
692         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
693                          TWL4030_INTERRUPTS_BCIIMR1A);
694         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
695                          TWL4030_INTERRUPTS_BCIIMR2A);
696 
697         if (!IS_ERR_OR_NULL(bci->transceiver)) {
698                 usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
699                 usb_put_phy(bci->transceiver);
700         }
701         free_irq(bci->irq_bci, bci);
702         free_irq(bci->irq_chg, bci);
703         power_supply_unregister(&bci->usb);
704         power_supply_unregister(&bci->ac);
705         kfree(bci);
706 
707         return 0;
708 }
709 
710 static const struct of_device_id twl_bci_of_match[] = {
711         {.compatible = "ti,twl4030-bci", },
712         { }
713 };
714 MODULE_DEVICE_TABLE(of, twl_bci_of_match);
715 
716 static struct platform_driver twl4030_bci_driver = {
717         .driver = {
718                 .name   = "twl4030_bci",
719                 .owner  = THIS_MODULE,
720                 .of_match_table = of_match_ptr(twl_bci_of_match),
721         },
722         .remove = __exit_p(twl4030_bci_remove),
723 };
724 
725 module_platform_driver_probe(twl4030_bci_driver, twl4030_bci_probe);
726 
727 MODULE_AUTHOR("Gražvydas Ignotas");
728 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
729 MODULE_LICENSE("GPL");
730 MODULE_ALIAS("platform:twl4030_bci");
731 

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