Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4

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

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