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Linux/drivers/extcon/extcon-max8997.c

  1 /*
  2  * extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC
  3  *
  4  *  Copyright (C) 2012 Samsung Electronics
  5  *  Donggeun Kim <dg77.kim@samsung.com>
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License as published by
  9  * the Free Software Foundation; either version 2 of the License, or
 10  * (at your option) any later version.
 11  *
 12  * This program is distributed in the hope that it will be useful,
 13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  * GNU General Public License for more details.
 16  */
 17 
 18 #include <linux/kernel.h>
 19 #include <linux/module.h>
 20 #include <linux/i2c.h>
 21 #include <linux/slab.h>
 22 #include <linux/interrupt.h>
 23 #include <linux/err.h>
 24 #include <linux/platform_device.h>
 25 #include <linux/kobject.h>
 26 #include <linux/mfd/max8997.h>
 27 #include <linux/mfd/max8997-private.h>
 28 #include <linux/extcon.h>
 29 #include <linux/irqdomain.h>
 30 
 31 #define DEV_NAME                        "max8997-muic"
 32 #define DELAY_MS_DEFAULT                20000           /* unit: millisecond */
 33 
 34 enum max8997_muic_adc_debounce_time {
 35         ADC_DEBOUNCE_TIME_0_5MS = 0,    /* 0.5ms */
 36         ADC_DEBOUNCE_TIME_10MS,         /* 10ms */
 37         ADC_DEBOUNCE_TIME_25MS,         /* 25ms */
 38         ADC_DEBOUNCE_TIME_38_62MS,      /* 38.62ms */
 39 };
 40 
 41 struct max8997_muic_irq {
 42         unsigned int irq;
 43         const char *name;
 44         unsigned int virq;
 45 };
 46 
 47 static struct max8997_muic_irq muic_irqs[] = {
 48         { MAX8997_MUICIRQ_ADCError,     "muic-ADCERROR" },
 49         { MAX8997_MUICIRQ_ADCLow,       "muic-ADCLOW" },
 50         { MAX8997_MUICIRQ_ADC,          "muic-ADC" },
 51         { MAX8997_MUICIRQ_VBVolt,       "muic-VBVOLT" },
 52         { MAX8997_MUICIRQ_DBChg,        "muic-DBCHG" },
 53         { MAX8997_MUICIRQ_DCDTmr,       "muic-DCDTMR" },
 54         { MAX8997_MUICIRQ_ChgDetRun,    "muic-CHGDETRUN" },
 55         { MAX8997_MUICIRQ_ChgTyp,       "muic-CHGTYP" },
 56         { MAX8997_MUICIRQ_OVP,          "muic-OVP" },
 57 };
 58 
 59 /* Define supported cable type */
 60 enum max8997_muic_acc_type {
 61         MAX8997_MUIC_ADC_GROUND = 0x0,
 62         MAX8997_MUIC_ADC_MHL,                   /* MHL*/
 63         MAX8997_MUIC_ADC_REMOTE_S1_BUTTON,
 64         MAX8997_MUIC_ADC_REMOTE_S2_BUTTON,
 65         MAX8997_MUIC_ADC_REMOTE_S3_BUTTON,
 66         MAX8997_MUIC_ADC_REMOTE_S4_BUTTON,
 67         MAX8997_MUIC_ADC_REMOTE_S5_BUTTON,
 68         MAX8997_MUIC_ADC_REMOTE_S6_BUTTON,
 69         MAX8997_MUIC_ADC_REMOTE_S7_BUTTON,
 70         MAX8997_MUIC_ADC_REMOTE_S8_BUTTON,
 71         MAX8997_MUIC_ADC_REMOTE_S9_BUTTON,
 72         MAX8997_MUIC_ADC_REMOTE_S10_BUTTON,
 73         MAX8997_MUIC_ADC_REMOTE_S11_BUTTON,
 74         MAX8997_MUIC_ADC_REMOTE_S12_BUTTON,
 75         MAX8997_MUIC_ADC_RESERVED_ACC_1,
 76         MAX8997_MUIC_ADC_RESERVED_ACC_2,
 77         MAX8997_MUIC_ADC_RESERVED_ACC_3,
 78         MAX8997_MUIC_ADC_RESERVED_ACC_4,
 79         MAX8997_MUIC_ADC_RESERVED_ACC_5,
 80         MAX8997_MUIC_ADC_CEA936_AUDIO,
 81         MAX8997_MUIC_ADC_PHONE_POWERED_DEV,
 82         MAX8997_MUIC_ADC_TTY_CONVERTER,
 83         MAX8997_MUIC_ADC_UART_CABLE,
 84         MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG,
 85         MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF,  /* JIG-USB-OFF */
 86         MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON,   /* JIG-USB-ON */
 87         MAX8997_MUIC_ADC_AV_CABLE_NOLOAD,       /* DESKDOCK */
 88         MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG,
 89         MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF, /* JIG-UART */
 90         MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON,  /* CARDOCK */
 91         MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE,
 92         MAX8997_MUIC_ADC_OPEN,                  /* OPEN */
 93 };
 94 
 95 enum max8997_muic_cable_group {
 96         MAX8997_CABLE_GROUP_ADC = 0,
 97         MAX8997_CABLE_GROUP_ADC_GND,
 98         MAX8997_CABLE_GROUP_CHG,
 99         MAX8997_CABLE_GROUP_VBVOLT,
100 };
101 
102 enum max8997_muic_usb_type {
103         MAX8997_USB_HOST,
104         MAX8997_USB_DEVICE,
105 };
106 
107 enum max8997_muic_charger_type {
108         MAX8997_CHARGER_TYPE_NONE = 0,
109         MAX8997_CHARGER_TYPE_USB,
110         MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT,
111         MAX8997_CHARGER_TYPE_DEDICATED_CHG,
112         MAX8997_CHARGER_TYPE_500MA,
113         MAX8997_CHARGER_TYPE_1A,
114         MAX8997_CHARGER_TYPE_DEAD_BATTERY = 7,
115 };
116 
117 struct max8997_muic_info {
118         struct device *dev;
119         struct i2c_client *muic;
120         struct extcon_dev *edev;
121         int prev_cable_type;
122         int prev_chg_type;
123         u8 status[2];
124 
125         int irq;
126         struct work_struct irq_work;
127         struct mutex mutex;
128 
129         struct max8997_muic_platform_data *muic_pdata;
130         enum max8997_muic_charger_type pre_charger_type;
131 
132         /*
133          * Use delayed workqueue to detect cable state and then
134          * notify cable state to notifiee/platform through uevent.
135          * After completing the booting of platform, the extcon provider
136          * driver should notify cable state to upper layer.
137          */
138         struct delayed_work wq_detcable;
139 
140         /*
141          * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
142          * h/w path of COMP2/COMN1 on CONTROL1 register.
143          */
144         int path_usb;
145         int path_uart;
146 };
147 
148 static const unsigned int max8997_extcon_cable[] = {
149         EXTCON_USB,
150         EXTCON_USB_HOST,
151         EXTCON_CHG_USB_SDP,
152         EXTCON_CHG_USB_DCP,
153         EXTCON_CHG_USB_FAST,
154         EXTCON_CHG_USB_SLOW,
155         EXTCON_CHG_USB_CDP,
156         EXTCON_DISP_MHL,
157         EXTCON_DOCK,
158         EXTCON_JIG,
159         EXTCON_NONE,
160 };
161 
162 /*
163  * max8997_muic_set_debounce_time - Set the debounce time of ADC
164  * @info: the instance including private data of max8997 MUIC
165  * @time: the debounce time of ADC
166  */
167 static int max8997_muic_set_debounce_time(struct max8997_muic_info *info,
168                 enum max8997_muic_adc_debounce_time time)
169 {
170         int ret;
171 
172         switch (time) {
173         case ADC_DEBOUNCE_TIME_0_5MS:
174         case ADC_DEBOUNCE_TIME_10MS:
175         case ADC_DEBOUNCE_TIME_25MS:
176         case ADC_DEBOUNCE_TIME_38_62MS:
177                 ret = max8997_update_reg(info->muic,
178                                           MAX8997_MUIC_REG_CONTROL3,
179                                           time << CONTROL3_ADCDBSET_SHIFT,
180                                           CONTROL3_ADCDBSET_MASK);
181                 if (ret) {
182                         dev_err(info->dev, "failed to set ADC debounce time\n");
183                         return ret;
184                 }
185                 break;
186         default:
187                 dev_err(info->dev, "invalid ADC debounce time\n");
188                 return -EINVAL;
189         }
190 
191         return 0;
192 };
193 
194 /*
195  * max8997_muic_set_path - Set hardware line according to attached cable
196  * @info: the instance including private data of max8997 MUIC
197  * @value: the path according to attached cable
198  * @attached: the state of cable (true:attached, false:detached)
199  *
200  * The max8997 MUIC device share outside H/W line among a varity of cables,
201  * so this function set internal path of H/W line according to the type of
202  * attached cable.
203  */
204 static int max8997_muic_set_path(struct max8997_muic_info *info,
205                 u8 val, bool attached)
206 {
207         int ret = 0;
208         u8 ctrl1, ctrl2 = 0;
209 
210         if (attached)
211                 ctrl1 = val;
212         else
213                 ctrl1 = CONTROL1_SW_OPEN;
214 
215         ret = max8997_update_reg(info->muic,
216                         MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK);
217         if (ret < 0) {
218                 dev_err(info->dev, "failed to update MUIC register\n");
219                 return ret;
220         }
221 
222         if (attached)
223                 ctrl2 |= CONTROL2_CPEN_MASK;    /* LowPwr=0, CPEn=1 */
224         else
225                 ctrl2 |= CONTROL2_LOWPWR_MASK;  /* LowPwr=1, CPEn=0 */
226 
227         ret = max8997_update_reg(info->muic,
228                         MAX8997_MUIC_REG_CONTROL2, ctrl2,
229                         CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK);
230         if (ret < 0) {
231                 dev_err(info->dev, "failed to update MUIC register\n");
232                 return ret;
233         }
234 
235         dev_info(info->dev,
236                 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
237                 ctrl1, ctrl2, attached ? "attached" : "detached");
238 
239         return 0;
240 }
241 
242 /*
243  * max8997_muic_get_cable_type - Return cable type and check cable state
244  * @info: the instance including private data of max8997 MUIC
245  * @group: the path according to attached cable
246  * @attached: store cable state and return
247  *
248  * This function check the cable state either attached or detached,
249  * and then divide precise type of cable according to cable group.
250  *      - MAX8997_CABLE_GROUP_ADC
251  *      - MAX8997_CABLE_GROUP_CHG
252  */
253 static int max8997_muic_get_cable_type(struct max8997_muic_info *info,
254                 enum max8997_muic_cable_group group, bool *attached)
255 {
256         int cable_type = 0;
257         int adc;
258         int chg_type;
259 
260         switch (group) {
261         case MAX8997_CABLE_GROUP_ADC:
262                 /*
263                  * Read ADC value to check cable type and decide cable state
264                  * according to cable type
265                  */
266                 adc = info->status[0] & STATUS1_ADC_MASK;
267                 adc >>= STATUS1_ADC_SHIFT;
268 
269                 /*
270                  * Check current cable state/cable type and store cable type
271                  * (info->prev_cable_type) for handling cable when cable is
272                  * detached.
273                  */
274                 if (adc == MAX8997_MUIC_ADC_OPEN) {
275                         *attached = false;
276 
277                         cable_type = info->prev_cable_type;
278                         info->prev_cable_type = MAX8997_MUIC_ADC_OPEN;
279                 } else {
280                         *attached = true;
281 
282                         cable_type = info->prev_cable_type = adc;
283                 }
284                 break;
285         case MAX8997_CABLE_GROUP_CHG:
286                 /*
287                  * Read charger type to check cable type and decide cable state
288                  * according to type of charger cable.
289                  */
290                 chg_type = info->status[1] & STATUS2_CHGTYP_MASK;
291                 chg_type >>= STATUS2_CHGTYP_SHIFT;
292 
293                 if (chg_type == MAX8997_CHARGER_TYPE_NONE) {
294                         *attached = false;
295 
296                         cable_type = info->prev_chg_type;
297                         info->prev_chg_type = MAX8997_CHARGER_TYPE_NONE;
298                 } else {
299                         *attached = true;
300 
301                         /*
302                          * Check current cable state/cable type and store cable
303                          * type(info->prev_chg_type) for handling cable when
304                          * charger cable is detached.
305                          */
306                         cable_type = info->prev_chg_type = chg_type;
307                 }
308 
309                 break;
310         default:
311                 dev_err(info->dev, "Unknown cable group (%d)\n", group);
312                 cable_type = -EINVAL;
313                 break;
314         }
315 
316         return cable_type;
317 }
318 
319 static int max8997_muic_handle_usb(struct max8997_muic_info *info,
320                         enum max8997_muic_usb_type usb_type, bool attached)
321 {
322         int ret = 0;
323 
324         if (usb_type == MAX8997_USB_HOST) {
325                 ret = max8997_muic_set_path(info, info->path_usb, attached);
326                 if (ret < 0) {
327                         dev_err(info->dev, "failed to update muic register\n");
328                         return ret;
329                 }
330         }
331 
332         switch (usb_type) {
333         case MAX8997_USB_HOST:
334                 extcon_set_cable_state_(info->edev, EXTCON_USB_HOST, attached);
335                 break;
336         case MAX8997_USB_DEVICE:
337                 extcon_set_cable_state_(info->edev, EXTCON_USB, attached);
338                 extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_SDP,
339                                         attached);
340                 break;
341         default:
342                 dev_err(info->dev, "failed to detect %s usb cable\n",
343                         attached ? "attached" : "detached");
344                 return -EINVAL;
345         }
346 
347         return 0;
348 }
349 
350 static int max8997_muic_handle_dock(struct max8997_muic_info *info,
351                         int cable_type, bool attached)
352 {
353         int ret = 0;
354 
355         ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
356         if (ret) {
357                 dev_err(info->dev, "failed to update muic register\n");
358                 return ret;
359         }
360 
361         switch (cable_type) {
362         case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
363         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
364                 extcon_set_cable_state_(info->edev, EXTCON_DOCK, attached);
365                 break;
366         default:
367                 dev_err(info->dev, "failed to detect %s dock device\n",
368                         attached ? "attached" : "detached");
369                 return -EINVAL;
370         }
371 
372         return 0;
373 }
374 
375 static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
376                         bool attached)
377 {
378         int ret = 0;
379 
380         /* switch to UART */
381         ret = max8997_muic_set_path(info, info->path_uart, attached);
382         if (ret) {
383                 dev_err(info->dev, "failed to update muic register\n");
384                 return ret;
385         }
386 
387         extcon_set_cable_state_(info->edev, EXTCON_JIG, attached);
388 
389         return 0;
390 }
391 
392 static int max8997_muic_adc_handler(struct max8997_muic_info *info)
393 {
394         int cable_type;
395         bool attached;
396         int ret = 0;
397 
398         /* Check cable state which is either detached or attached */
399         cable_type = max8997_muic_get_cable_type(info,
400                                 MAX8997_CABLE_GROUP_ADC, &attached);
401 
402         switch (cable_type) {
403         case MAX8997_MUIC_ADC_GROUND:
404                 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached);
405                 if (ret < 0)
406                         return ret;
407                 break;
408         case MAX8997_MUIC_ADC_MHL:
409                 extcon_set_cable_state_(info->edev, EXTCON_DISP_MHL, attached);
410                 break;
411         case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF:
412         case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON:
413                 ret = max8997_muic_handle_usb(info,
414                                              MAX8997_USB_DEVICE, attached);
415                 if (ret < 0)
416                         return ret;
417                 break;
418         case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
419         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
420                 ret = max8997_muic_handle_dock(info, cable_type, attached);
421                 if (ret < 0)
422                         return ret;
423                 break;
424         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF:
425                 ret = max8997_muic_handle_jig_uart(info, attached);
426                 break;
427         case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON:
428         case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON:
429         case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON:
430         case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON:
431         case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON:
432         case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON:
433         case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON:
434         case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON:
435         case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON:
436         case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON:
437         case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON:
438         case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON:
439         case MAX8997_MUIC_ADC_RESERVED_ACC_1:
440         case MAX8997_MUIC_ADC_RESERVED_ACC_2:
441         case MAX8997_MUIC_ADC_RESERVED_ACC_3:
442         case MAX8997_MUIC_ADC_RESERVED_ACC_4:
443         case MAX8997_MUIC_ADC_RESERVED_ACC_5:
444         case MAX8997_MUIC_ADC_CEA936_AUDIO:
445         case MAX8997_MUIC_ADC_PHONE_POWERED_DEV:
446         case MAX8997_MUIC_ADC_TTY_CONVERTER:
447         case MAX8997_MUIC_ADC_UART_CABLE:
448         case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG:
449         case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG:
450         case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE:
451                 /*
452                  * This cable isn't used in general case if it is specially
453                  * needed to detect additional cable, should implement
454                  * proper operation when this cable is attached/detached.
455                  */
456                 dev_info(info->dev,
457                         "cable is %s but it isn't used (type:0x%x)\n",
458                         attached ? "attached" : "detached", cable_type);
459                 return -EAGAIN;
460         default:
461                 dev_err(info->dev,
462                         "failed to detect %s unknown cable (type:0x%x)\n",
463                         attached ? "attached" : "detached", cable_type);
464                 return -EINVAL;
465         }
466 
467         return 0;
468 }
469 
470 static int max8997_muic_chg_handler(struct max8997_muic_info *info)
471 {
472         int chg_type;
473         bool attached;
474         int adc;
475 
476         chg_type = max8997_muic_get_cable_type(info,
477                                 MAX8997_CABLE_GROUP_CHG, &attached);
478 
479         switch (chg_type) {
480         case MAX8997_CHARGER_TYPE_NONE:
481                 break;
482         case MAX8997_CHARGER_TYPE_USB:
483                 adc = info->status[0] & STATUS1_ADC_MASK;
484                 adc >>= STATUS1_ADC_SHIFT;
485 
486                 if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) {
487                         max8997_muic_handle_usb(info,
488                                         MAX8997_USB_DEVICE, attached);
489                 }
490                 break;
491         case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
492                 extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_CDP,
493                                         attached);
494                 break;
495         case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
496                 extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_DCP,
497                                         attached);
498                 break;
499         case MAX8997_CHARGER_TYPE_500MA:
500                 extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_SLOW,
501                                         attached);
502                 break;
503         case MAX8997_CHARGER_TYPE_1A:
504                 extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_FAST,
505                                         attached);
506                 break;
507         default:
508                 dev_err(info->dev,
509                         "failed to detect %s unknown chg cable (type:0x%x)\n",
510                         attached ? "attached" : "detached", chg_type);
511                 return -EINVAL;
512         }
513 
514         return 0;
515 }
516 
517 static void max8997_muic_irq_work(struct work_struct *work)
518 {
519         struct max8997_muic_info *info = container_of(work,
520                         struct max8997_muic_info, irq_work);
521         int irq_type = 0;
522         int i, ret;
523 
524         if (!info->edev)
525                 return;
526 
527         mutex_lock(&info->mutex);
528 
529         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
530                 if (info->irq == muic_irqs[i].virq)
531                         irq_type = muic_irqs[i].irq;
532 
533         ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
534                                 2, info->status);
535         if (ret) {
536                 dev_err(info->dev, "failed to read muic register\n");
537                 mutex_unlock(&info->mutex);
538                 return;
539         }
540 
541         switch (irq_type) {
542         case MAX8997_MUICIRQ_ADCError:
543         case MAX8997_MUICIRQ_ADCLow:
544         case MAX8997_MUICIRQ_ADC:
545                 /* Handle all of cable except for charger cable */
546                 ret = max8997_muic_adc_handler(info);
547                 break;
548         case MAX8997_MUICIRQ_VBVolt:
549         case MAX8997_MUICIRQ_DBChg:
550         case MAX8997_MUICIRQ_DCDTmr:
551         case MAX8997_MUICIRQ_ChgDetRun:
552         case MAX8997_MUICIRQ_ChgTyp:
553                 /* Handle charger cable */
554                 ret = max8997_muic_chg_handler(info);
555                 break;
556         case MAX8997_MUICIRQ_OVP:
557                 break;
558         default:
559                 dev_info(info->dev, "misc interrupt: irq %d occurred\n",
560                                 irq_type);
561                 mutex_unlock(&info->mutex);
562                 return;
563         }
564 
565         if (ret < 0)
566                 dev_err(info->dev, "failed to handle MUIC interrupt\n");
567 
568         mutex_unlock(&info->mutex);
569 }
570 
571 static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
572 {
573         struct max8997_muic_info *info = data;
574 
575         dev_dbg(info->dev, "irq:%d\n", irq);
576         info->irq = irq;
577 
578         schedule_work(&info->irq_work);
579 
580         return IRQ_HANDLED;
581 }
582 
583 static int max8997_muic_detect_dev(struct max8997_muic_info *info)
584 {
585         int ret = 0;
586         int adc;
587         int chg_type;
588         bool attached;
589 
590         mutex_lock(&info->mutex);
591 
592         /* Read STATUSx register to detect accessory */
593         ret = max8997_bulk_read(info->muic,
594                         MAX8997_MUIC_REG_STATUS1, 2, info->status);
595         if (ret) {
596                 dev_err(info->dev, "failed to read MUIC register\n");
597                 mutex_unlock(&info->mutex);
598                 return ret;
599         }
600 
601         adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC,
602                                         &attached);
603         if (attached && adc != MAX8997_MUIC_ADC_OPEN) {
604                 ret = max8997_muic_adc_handler(info);
605                 if (ret < 0) {
606                         dev_err(info->dev, "Cannot detect ADC cable\n");
607                         mutex_unlock(&info->mutex);
608                         return ret;
609                 }
610         }
611 
612         chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG,
613                                         &attached);
614         if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) {
615                 ret = max8997_muic_chg_handler(info);
616                 if (ret < 0) {
617                         dev_err(info->dev, "Cannot detect charger cable\n");
618                         mutex_unlock(&info->mutex);
619                         return ret;
620                 }
621         }
622 
623         mutex_unlock(&info->mutex);
624 
625         return 0;
626 }
627 
628 static void max8997_muic_detect_cable_wq(struct work_struct *work)
629 {
630         struct max8997_muic_info *info = container_of(to_delayed_work(work),
631                                 struct max8997_muic_info, wq_detcable);
632         int ret;
633 
634         ret = max8997_muic_detect_dev(info);
635         if (ret < 0)
636                 dev_err(info->dev, "failed to detect cable type\n");
637 }
638 
639 static int max8997_muic_probe(struct platform_device *pdev)
640 {
641         struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
642         struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
643         struct max8997_muic_info *info;
644         int delay_jiffies;
645         int ret, i;
646 
647         info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info),
648                             GFP_KERNEL);
649         if (!info)
650                 return -ENOMEM;
651 
652         info->dev = &pdev->dev;
653         info->muic = max8997->muic;
654 
655         platform_set_drvdata(pdev, info);
656         mutex_init(&info->mutex);
657 
658         INIT_WORK(&info->irq_work, max8997_muic_irq_work);
659 
660         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
661                 struct max8997_muic_irq *muic_irq = &muic_irqs[i];
662                 unsigned int virq = 0;
663 
664                 virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
665                 if (!virq) {
666                         ret = -EINVAL;
667                         goto err_irq;
668                 }
669                 muic_irq->virq = virq;
670 
671                 ret = request_threaded_irq(virq, NULL,
672                                 max8997_muic_irq_handler,
673                                 IRQF_NO_SUSPEND,
674                                 muic_irq->name, info);
675                 if (ret) {
676                         dev_err(&pdev->dev,
677                                 "failed: irq request (IRQ: %d, error :%d)\n",
678                                 muic_irq->irq, ret);
679                         goto err_irq;
680                 }
681         }
682 
683         /* External connector */
684         info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable);
685         if (IS_ERR(info->edev)) {
686                 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
687                 ret = -ENOMEM;
688                 goto err_irq;
689         }
690 
691         ret = devm_extcon_dev_register(&pdev->dev, info->edev);
692         if (ret) {
693                 dev_err(&pdev->dev, "failed to register extcon device\n");
694                 goto err_irq;
695         }
696 
697         if (pdata && pdata->muic_pdata) {
698                 struct max8997_muic_platform_data *muic_pdata
699                         = pdata->muic_pdata;
700 
701                 /* Initialize registers according to platform data */
702                 for (i = 0; i < muic_pdata->num_init_data; i++) {
703                         max8997_write_reg(info->muic,
704                                         muic_pdata->init_data[i].addr,
705                                         muic_pdata->init_data[i].data);
706                 }
707 
708                 /*
709                  * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
710                  * h/w path of COMP2/COMN1 on CONTROL1 register.
711                  */
712                 if (muic_pdata->path_uart)
713                         info->path_uart = muic_pdata->path_uart;
714                 else
715                         info->path_uart = CONTROL1_SW_UART;
716 
717                 if (muic_pdata->path_usb)
718                         info->path_usb = muic_pdata->path_usb;
719                 else
720                         info->path_usb = CONTROL1_SW_USB;
721 
722                 /*
723                  * Default delay time for detecting cable state
724                  * after certain time.
725                  */
726                 if (muic_pdata->detcable_delay_ms)
727                         delay_jiffies =
728                                 msecs_to_jiffies(muic_pdata->detcable_delay_ms);
729                 else
730                         delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
731         } else {
732                 info->path_uart = CONTROL1_SW_UART;
733                 info->path_usb = CONTROL1_SW_USB;
734                 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
735         }
736 
737         /* Set initial path for UART */
738          max8997_muic_set_path(info, info->path_uart, true);
739 
740         /* Set ADC debounce time */
741         max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
742 
743         /*
744          * Detect accessory after completing the initialization of platform
745          *
746          * - Use delayed workqueue to detect cable state and then
747          * notify cable state to notifiee/platform through uevent.
748          * After completing the booting of platform, the extcon provider
749          * driver should notify cable state to upper layer.
750          */
751         INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq);
752         queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
753                         delay_jiffies);
754 
755         return 0;
756 
757 err_irq:
758         while (--i >= 0)
759                 free_irq(muic_irqs[i].virq, info);
760         return ret;
761 }
762 
763 static int max8997_muic_remove(struct platform_device *pdev)
764 {
765         struct max8997_muic_info *info = platform_get_drvdata(pdev);
766         int i;
767 
768         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
769                 free_irq(muic_irqs[i].virq, info);
770         cancel_work_sync(&info->irq_work);
771 
772         return 0;
773 }
774 
775 static struct platform_driver max8997_muic_driver = {
776         .driver         = {
777                 .name   = DEV_NAME,
778         },
779         .probe          = max8997_muic_probe,
780         .remove         = max8997_muic_remove,
781 };
782 
783 module_platform_driver(max8997_muic_driver);
784 
785 MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
786 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
787 MODULE_LICENSE("GPL");
788 

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