Merge tag '5.10-rc-smb3-fixes-part1' of git://git.samba.org/sfrench/cifs-2.6
[linux-2.6-microblaze.git] / drivers / extcon / extcon-max8997.c
1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC
4 //
5 //  Copyright (C) 2012 Samsung Electronics
6 //  Donggeun Kim <dg77.kim@samsung.com>
7
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/i2c.h>
11 #include <linux/slab.h>
12 #include <linux/interrupt.h>
13 #include <linux/err.h>
14 #include <linux/platform_device.h>
15 #include <linux/kobject.h>
16 #include <linux/mfd/max8997.h>
17 #include <linux/mfd/max8997-private.h>
18 #include <linux/extcon-provider.h>
19 #include <linux/irqdomain.h>
20
21 #define DEV_NAME                        "max8997-muic"
22 #define DELAY_MS_DEFAULT                20000           /* unit: millisecond */
23
24 enum max8997_muic_adc_debounce_time {
25         ADC_DEBOUNCE_TIME_0_5MS = 0,    /* 0.5ms */
26         ADC_DEBOUNCE_TIME_10MS,         /* 10ms */
27         ADC_DEBOUNCE_TIME_25MS,         /* 25ms */
28         ADC_DEBOUNCE_TIME_38_62MS,      /* 38.62ms */
29 };
30
31 struct max8997_muic_irq {
32         unsigned int irq;
33         const char *name;
34         unsigned int virq;
35 };
36
37 static struct max8997_muic_irq muic_irqs[] = {
38         { MAX8997_MUICIRQ_ADCError,     "muic-ADCERROR" },
39         { MAX8997_MUICIRQ_ADCLow,       "muic-ADCLOW" },
40         { MAX8997_MUICIRQ_ADC,          "muic-ADC" },
41         { MAX8997_MUICIRQ_VBVolt,       "muic-VBVOLT" },
42         { MAX8997_MUICIRQ_DBChg,        "muic-DBCHG" },
43         { MAX8997_MUICIRQ_DCDTmr,       "muic-DCDTMR" },
44         { MAX8997_MUICIRQ_ChgDetRun,    "muic-CHGDETRUN" },
45         { MAX8997_MUICIRQ_ChgTyp,       "muic-CHGTYP" },
46         { MAX8997_MUICIRQ_OVP,          "muic-OVP" },
47 };
48
49 /* Define supported cable type */
50 enum max8997_muic_acc_type {
51         MAX8997_MUIC_ADC_GROUND = 0x0,
52         MAX8997_MUIC_ADC_MHL,                   /* MHL*/
53         MAX8997_MUIC_ADC_REMOTE_S1_BUTTON,
54         MAX8997_MUIC_ADC_REMOTE_S2_BUTTON,
55         MAX8997_MUIC_ADC_REMOTE_S3_BUTTON,
56         MAX8997_MUIC_ADC_REMOTE_S4_BUTTON,
57         MAX8997_MUIC_ADC_REMOTE_S5_BUTTON,
58         MAX8997_MUIC_ADC_REMOTE_S6_BUTTON,
59         MAX8997_MUIC_ADC_REMOTE_S7_BUTTON,
60         MAX8997_MUIC_ADC_REMOTE_S8_BUTTON,
61         MAX8997_MUIC_ADC_REMOTE_S9_BUTTON,
62         MAX8997_MUIC_ADC_REMOTE_S10_BUTTON,
63         MAX8997_MUIC_ADC_REMOTE_S11_BUTTON,
64         MAX8997_MUIC_ADC_REMOTE_S12_BUTTON,
65         MAX8997_MUIC_ADC_RESERVED_ACC_1,
66         MAX8997_MUIC_ADC_RESERVED_ACC_2,
67         MAX8997_MUIC_ADC_RESERVED_ACC_3,
68         MAX8997_MUIC_ADC_RESERVED_ACC_4,
69         MAX8997_MUIC_ADC_RESERVED_ACC_5,
70         MAX8997_MUIC_ADC_CEA936_AUDIO,
71         MAX8997_MUIC_ADC_PHONE_POWERED_DEV,
72         MAX8997_MUIC_ADC_TTY_CONVERTER,
73         MAX8997_MUIC_ADC_UART_CABLE,
74         MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG,
75         MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF,  /* JIG-USB-OFF */
76         MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON,   /* JIG-USB-ON */
77         MAX8997_MUIC_ADC_AV_CABLE_NOLOAD,       /* DESKDOCK */
78         MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG,
79         MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF, /* JIG-UART */
80         MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON,  /* CARDOCK */
81         MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE,
82         MAX8997_MUIC_ADC_OPEN,                  /* OPEN */
83 };
84
85 enum max8997_muic_cable_group {
86         MAX8997_CABLE_GROUP_ADC = 0,
87         MAX8997_CABLE_GROUP_ADC_GND,
88         MAX8997_CABLE_GROUP_CHG,
89         MAX8997_CABLE_GROUP_VBVOLT,
90 };
91
92 enum max8997_muic_usb_type {
93         MAX8997_USB_HOST,
94         MAX8997_USB_DEVICE,
95 };
96
97 enum max8997_muic_charger_type {
98         MAX8997_CHARGER_TYPE_NONE = 0,
99         MAX8997_CHARGER_TYPE_USB,
100         MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT,
101         MAX8997_CHARGER_TYPE_DEDICATED_CHG,
102         MAX8997_CHARGER_TYPE_500MA,
103         MAX8997_CHARGER_TYPE_1A,
104         MAX8997_CHARGER_TYPE_DEAD_BATTERY = 7,
105 };
106
107 struct max8997_muic_info {
108         struct device *dev;
109         struct i2c_client *muic;
110         struct extcon_dev *edev;
111         int prev_cable_type;
112         int prev_chg_type;
113         u8 status[2];
114
115         int irq;
116         struct work_struct irq_work;
117         struct mutex mutex;
118
119         struct max8997_muic_platform_data *muic_pdata;
120         enum max8997_muic_charger_type pre_charger_type;
121
122         /*
123          * Use delayed workqueue to detect cable state and then
124          * notify cable state to notifiee/platform through uevent.
125          * After completing the booting of platform, the extcon provider
126          * driver should notify cable state to upper layer.
127          */
128         struct delayed_work wq_detcable;
129
130         /*
131          * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
132          * h/w path of COMP2/COMN1 on CONTROL1 register.
133          */
134         int path_usb;
135         int path_uart;
136 };
137
138 static const unsigned int max8997_extcon_cable[] = {
139         EXTCON_USB,
140         EXTCON_USB_HOST,
141         EXTCON_CHG_USB_SDP,
142         EXTCON_CHG_USB_DCP,
143         EXTCON_CHG_USB_FAST,
144         EXTCON_CHG_USB_SLOW,
145         EXTCON_CHG_USB_CDP,
146         EXTCON_DISP_MHL,
147         EXTCON_DOCK,
148         EXTCON_JIG,
149         EXTCON_NONE,
150 };
151
152 /*
153  * max8997_muic_set_debounce_time - Set the debounce time of ADC
154  * @info: the instance including private data of max8997 MUIC
155  * @time: the debounce time of ADC
156  */
157 static int max8997_muic_set_debounce_time(struct max8997_muic_info *info,
158                 enum max8997_muic_adc_debounce_time time)
159 {
160         int ret;
161
162         switch (time) {
163         case ADC_DEBOUNCE_TIME_0_5MS:
164         case ADC_DEBOUNCE_TIME_10MS:
165         case ADC_DEBOUNCE_TIME_25MS:
166         case ADC_DEBOUNCE_TIME_38_62MS:
167                 ret = max8997_update_reg(info->muic,
168                                           MAX8997_MUIC_REG_CONTROL3,
169                                           time << CONTROL3_ADCDBSET_SHIFT,
170                                           CONTROL3_ADCDBSET_MASK);
171                 if (ret) {
172                         dev_err(info->dev, "failed to set ADC debounce time\n");
173                         return ret;
174                 }
175                 break;
176         default:
177                 dev_err(info->dev, "invalid ADC debounce time\n");
178                 return -EINVAL;
179         }
180
181         return 0;
182 };
183
184 /*
185  * max8997_muic_set_path - Set hardware line according to attached cable
186  * @info: the instance including private data of max8997 MUIC
187  * @value: the path according to attached cable
188  * @attached: the state of cable (true:attached, false:detached)
189  *
190  * The max8997 MUIC device share outside H/W line among a varity of cables,
191  * so this function set internal path of H/W line according to the type of
192  * attached cable.
193  */
194 static int max8997_muic_set_path(struct max8997_muic_info *info,
195                 u8 val, bool attached)
196 {
197         int ret;
198         u8 ctrl1, ctrl2 = 0;
199
200         if (attached)
201                 ctrl1 = val;
202         else
203                 ctrl1 = CONTROL1_SW_OPEN;
204
205         ret = max8997_update_reg(info->muic,
206                         MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK);
207         if (ret < 0) {
208                 dev_err(info->dev, "failed to update MUIC register\n");
209                 return ret;
210         }
211
212         if (attached)
213                 ctrl2 |= CONTROL2_CPEN_MASK;    /* LowPwr=0, CPEn=1 */
214         else
215                 ctrl2 |= CONTROL2_LOWPWR_MASK;  /* LowPwr=1, CPEn=0 */
216
217         ret = max8997_update_reg(info->muic,
218                         MAX8997_MUIC_REG_CONTROL2, ctrl2,
219                         CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK);
220         if (ret < 0) {
221                 dev_err(info->dev, "failed to update MUIC register\n");
222                 return ret;
223         }
224
225         dev_info(info->dev,
226                 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
227                 ctrl1, ctrl2, attached ? "attached" : "detached");
228
229         return 0;
230 }
231
232 /*
233  * max8997_muic_get_cable_type - Return cable type and check cable state
234  * @info: the instance including private data of max8997 MUIC
235  * @group: the path according to attached cable
236  * @attached: store cable state and return
237  *
238  * This function check the cable state either attached or detached,
239  * and then divide precise type of cable according to cable group.
240  *      - MAX8997_CABLE_GROUP_ADC
241  *      - MAX8997_CABLE_GROUP_CHG
242  */
243 static int max8997_muic_get_cable_type(struct max8997_muic_info *info,
244                 enum max8997_muic_cable_group group, bool *attached)
245 {
246         int cable_type = 0;
247         int adc;
248         int chg_type;
249
250         switch (group) {
251         case MAX8997_CABLE_GROUP_ADC:
252                 /*
253                  * Read ADC value to check cable type and decide cable state
254                  * according to cable type
255                  */
256                 adc = info->status[0] & STATUS1_ADC_MASK;
257                 adc >>= STATUS1_ADC_SHIFT;
258
259                 /*
260                  * Check current cable state/cable type and store cable type
261                  * (info->prev_cable_type) for handling cable when cable is
262                  * detached.
263                  */
264                 if (adc == MAX8997_MUIC_ADC_OPEN) {
265                         *attached = false;
266
267                         cable_type = info->prev_cable_type;
268                         info->prev_cable_type = MAX8997_MUIC_ADC_OPEN;
269                 } else {
270                         *attached = true;
271
272                         cable_type = info->prev_cable_type = adc;
273                 }
274                 break;
275         case MAX8997_CABLE_GROUP_CHG:
276                 /*
277                  * Read charger type to check cable type and decide cable state
278                  * according to type of charger cable.
279                  */
280                 chg_type = info->status[1] & STATUS2_CHGTYP_MASK;
281                 chg_type >>= STATUS2_CHGTYP_SHIFT;
282
283                 if (chg_type == MAX8997_CHARGER_TYPE_NONE) {
284                         *attached = false;
285
286                         cable_type = info->prev_chg_type;
287                         info->prev_chg_type = MAX8997_CHARGER_TYPE_NONE;
288                 } else {
289                         *attached = true;
290
291                         /*
292                          * Check current cable state/cable type and store cable
293                          * type(info->prev_chg_type) for handling cable when
294                          * charger cable is detached.
295                          */
296                         cable_type = info->prev_chg_type = chg_type;
297                 }
298
299                 break;
300         default:
301                 dev_err(info->dev, "Unknown cable group (%d)\n", group);
302                 cable_type = -EINVAL;
303                 break;
304         }
305
306         return cable_type;
307 }
308
309 static int max8997_muic_handle_usb(struct max8997_muic_info *info,
310                         enum max8997_muic_usb_type usb_type, bool attached)
311 {
312         int ret = 0;
313
314         ret = max8997_muic_set_path(info, info->path_usb, attached);
315         if (ret < 0) {
316                 dev_err(info->dev, "failed to update muic register\n");
317                 return ret;
318         }
319
320         switch (usb_type) {
321         case MAX8997_USB_HOST:
322                 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, attached);
323                 break;
324         case MAX8997_USB_DEVICE:
325                 extcon_set_state_sync(info->edev, EXTCON_USB, attached);
326                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
327                                         attached);
328                 break;
329         default:
330                 dev_err(info->dev, "failed to detect %s usb cable\n",
331                         attached ? "attached" : "detached");
332                 return -EINVAL;
333         }
334
335         return 0;
336 }
337
338 static int max8997_muic_handle_dock(struct max8997_muic_info *info,
339                         int cable_type, bool attached)
340 {
341         int ret = 0;
342
343         ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
344         if (ret) {
345                 dev_err(info->dev, "failed to update muic register\n");
346                 return ret;
347         }
348
349         switch (cable_type) {
350         case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
351         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
352                 extcon_set_state_sync(info->edev, EXTCON_DOCK, attached);
353                 break;
354         default:
355                 dev_err(info->dev, "failed to detect %s dock device\n",
356                         attached ? "attached" : "detached");
357                 return -EINVAL;
358         }
359
360         return 0;
361 }
362
363 static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
364                         bool attached)
365 {
366         int ret = 0;
367
368         /* switch to UART */
369         ret = max8997_muic_set_path(info, info->path_uart, attached);
370         if (ret) {
371                 dev_err(info->dev, "failed to update muic register\n");
372                 return ret;
373         }
374
375         extcon_set_state_sync(info->edev, EXTCON_JIG, attached);
376
377         return 0;
378 }
379
380 static int max8997_muic_adc_handler(struct max8997_muic_info *info)
381 {
382         int cable_type;
383         bool attached;
384         int ret = 0;
385
386         /* Check cable state which is either detached or attached */
387         cable_type = max8997_muic_get_cable_type(info,
388                                 MAX8997_CABLE_GROUP_ADC, &attached);
389
390         switch (cable_type) {
391         case MAX8997_MUIC_ADC_GROUND:
392                 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached);
393                 if (ret < 0)
394                         return ret;
395                 break;
396         case MAX8997_MUIC_ADC_MHL:
397                 extcon_set_state_sync(info->edev, EXTCON_DISP_MHL, attached);
398                 break;
399         case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF:
400         case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON:
401                 ret = max8997_muic_handle_usb(info,
402                                              MAX8997_USB_DEVICE, attached);
403                 if (ret < 0)
404                         return ret;
405                 break;
406         case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
407         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
408                 ret = max8997_muic_handle_dock(info, cable_type, attached);
409                 if (ret < 0)
410                         return ret;
411                 break;
412         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF:
413                 ret = max8997_muic_handle_jig_uart(info, attached);
414                 break;
415         case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON:
416         case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON:
417         case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON:
418         case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON:
419         case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON:
420         case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON:
421         case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON:
422         case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON:
423         case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON:
424         case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON:
425         case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON:
426         case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON:
427         case MAX8997_MUIC_ADC_RESERVED_ACC_1:
428         case MAX8997_MUIC_ADC_RESERVED_ACC_2:
429         case MAX8997_MUIC_ADC_RESERVED_ACC_3:
430         case MAX8997_MUIC_ADC_RESERVED_ACC_4:
431         case MAX8997_MUIC_ADC_RESERVED_ACC_5:
432         case MAX8997_MUIC_ADC_CEA936_AUDIO:
433         case MAX8997_MUIC_ADC_PHONE_POWERED_DEV:
434         case MAX8997_MUIC_ADC_TTY_CONVERTER:
435         case MAX8997_MUIC_ADC_UART_CABLE:
436         case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG:
437         case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG:
438         case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE:
439                 /*
440                  * This cable isn't used in general case if it is specially
441                  * needed to detect additional cable, should implement
442                  * proper operation when this cable is attached/detached.
443                  */
444                 dev_info(info->dev,
445                         "cable is %s but it isn't used (type:0x%x)\n",
446                         attached ? "attached" : "detached", cable_type);
447                 return -EAGAIN;
448         default:
449                 dev_err(info->dev,
450                         "failed to detect %s unknown cable (type:0x%x)\n",
451                         attached ? "attached" : "detached", cable_type);
452                 return -EINVAL;
453         }
454
455         return 0;
456 }
457
458 static int max8997_muic_chg_handler(struct max8997_muic_info *info)
459 {
460         int chg_type;
461         bool attached;
462         int adc;
463
464         chg_type = max8997_muic_get_cable_type(info,
465                                 MAX8997_CABLE_GROUP_CHG, &attached);
466
467         switch (chg_type) {
468         case MAX8997_CHARGER_TYPE_NONE:
469                 break;
470         case MAX8997_CHARGER_TYPE_USB:
471                 adc = info->status[0] & STATUS1_ADC_MASK;
472                 adc >>= STATUS1_ADC_SHIFT;
473
474                 if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) {
475                         max8997_muic_handle_usb(info,
476                                         MAX8997_USB_DEVICE, attached);
477                 }
478                 break;
479         case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
480                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP,
481                                         attached);
482                 break;
483         case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
484                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
485                                         attached);
486                 break;
487         case MAX8997_CHARGER_TYPE_500MA:
488                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW,
489                                         attached);
490                 break;
491         case MAX8997_CHARGER_TYPE_1A:
492                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST,
493                                         attached);
494                 break;
495         default:
496                 dev_err(info->dev,
497                         "failed to detect %s unknown chg cable (type:0x%x)\n",
498                         attached ? "attached" : "detached", chg_type);
499                 return -EINVAL;
500         }
501
502         return 0;
503 }
504
505 static void max8997_muic_irq_work(struct work_struct *work)
506 {
507         struct max8997_muic_info *info = container_of(work,
508                         struct max8997_muic_info, irq_work);
509         int irq_type = 0;
510         int i, ret;
511
512         if (!info->edev)
513                 return;
514
515         mutex_lock(&info->mutex);
516
517         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
518                 if (info->irq == muic_irqs[i].virq)
519                         irq_type = muic_irqs[i].irq;
520
521         ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
522                                 2, info->status);
523         if (ret) {
524                 dev_err(info->dev, "failed to read muic register\n");
525                 mutex_unlock(&info->mutex);
526                 return;
527         }
528
529         switch (irq_type) {
530         case MAX8997_MUICIRQ_ADCError:
531         case MAX8997_MUICIRQ_ADCLow:
532         case MAX8997_MUICIRQ_ADC:
533                 /* Handle all of cable except for charger cable */
534                 ret = max8997_muic_adc_handler(info);
535                 break;
536         case MAX8997_MUICIRQ_VBVolt:
537         case MAX8997_MUICIRQ_DBChg:
538         case MAX8997_MUICIRQ_DCDTmr:
539         case MAX8997_MUICIRQ_ChgDetRun:
540         case MAX8997_MUICIRQ_ChgTyp:
541                 /* Handle charger cable */
542                 ret = max8997_muic_chg_handler(info);
543                 break;
544         case MAX8997_MUICIRQ_OVP:
545                 break;
546         default:
547                 dev_info(info->dev, "misc interrupt: irq %d occurred\n",
548                                 irq_type);
549                 mutex_unlock(&info->mutex);
550                 return;
551         }
552
553         if (ret < 0)
554                 dev_err(info->dev, "failed to handle MUIC interrupt\n");
555
556         mutex_unlock(&info->mutex);
557 }
558
559 static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
560 {
561         struct max8997_muic_info *info = data;
562
563         dev_dbg(info->dev, "irq:%d\n", irq);
564         info->irq = irq;
565
566         schedule_work(&info->irq_work);
567
568         return IRQ_HANDLED;
569 }
570
571 static int max8997_muic_detect_dev(struct max8997_muic_info *info)
572 {
573         int ret = 0;
574         int adc;
575         int chg_type;
576         bool attached;
577
578         mutex_lock(&info->mutex);
579
580         /* Read STATUSx register to detect accessory */
581         ret = max8997_bulk_read(info->muic,
582                         MAX8997_MUIC_REG_STATUS1, 2, info->status);
583         if (ret) {
584                 dev_err(info->dev, "failed to read MUIC register\n");
585                 mutex_unlock(&info->mutex);
586                 return ret;
587         }
588
589         adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC,
590                                         &attached);
591         if (attached && adc != MAX8997_MUIC_ADC_OPEN) {
592                 ret = max8997_muic_adc_handler(info);
593                 if (ret < 0) {
594                         dev_err(info->dev, "Cannot detect ADC cable\n");
595                         mutex_unlock(&info->mutex);
596                         return ret;
597                 }
598         }
599
600         chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG,
601                                         &attached);
602         if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) {
603                 ret = max8997_muic_chg_handler(info);
604                 if (ret < 0) {
605                         dev_err(info->dev, "Cannot detect charger cable\n");
606                         mutex_unlock(&info->mutex);
607                         return ret;
608                 }
609         }
610
611         mutex_unlock(&info->mutex);
612
613         return 0;
614 }
615
616 static void max8997_muic_detect_cable_wq(struct work_struct *work)
617 {
618         struct max8997_muic_info *info = container_of(to_delayed_work(work),
619                                 struct max8997_muic_info, wq_detcable);
620         int ret;
621
622         ret = max8997_muic_detect_dev(info);
623         if (ret < 0)
624                 dev_err(info->dev, "failed to detect cable type\n");
625 }
626
627 static int max8997_muic_probe(struct platform_device *pdev)
628 {
629         struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
630         struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
631         struct max8997_muic_info *info;
632         int delay_jiffies;
633         int cable_type;
634         bool attached;
635         int ret, i;
636
637         info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info),
638                             GFP_KERNEL);
639         if (!info)
640                 return -ENOMEM;
641
642         info->dev = &pdev->dev;
643         info->muic = max8997->muic;
644
645         platform_set_drvdata(pdev, info);
646         mutex_init(&info->mutex);
647
648         INIT_WORK(&info->irq_work, max8997_muic_irq_work);
649
650         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
651                 struct max8997_muic_irq *muic_irq = &muic_irqs[i];
652                 unsigned int virq = 0;
653
654                 virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
655                 if (!virq) {
656                         ret = -EINVAL;
657                         goto err_irq;
658                 }
659                 muic_irq->virq = virq;
660
661                 ret = request_threaded_irq(virq, NULL,
662                                 max8997_muic_irq_handler,
663                                 IRQF_NO_SUSPEND,
664                                 muic_irq->name, info);
665                 if (ret) {
666                         dev_err(&pdev->dev,
667                                 "failed: irq request (IRQ: %d, error :%d)\n",
668                                 muic_irq->irq, ret);
669                         goto err_irq;
670                 }
671         }
672
673         /* External connector */
674         info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable);
675         if (IS_ERR(info->edev)) {
676                 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
677                 ret = PTR_ERR(info->edev);
678                 goto err_irq;
679         }
680
681         ret = devm_extcon_dev_register(&pdev->dev, info->edev);
682         if (ret) {
683                 dev_err(&pdev->dev, "failed to register extcon device\n");
684                 goto err_irq;
685         }
686
687         if (pdata && pdata->muic_pdata) {
688                 struct max8997_muic_platform_data *muic_pdata
689                         = pdata->muic_pdata;
690
691                 /* Initialize registers according to platform data */
692                 for (i = 0; i < muic_pdata->num_init_data; i++) {
693                         max8997_write_reg(info->muic,
694                                         muic_pdata->init_data[i].addr,
695                                         muic_pdata->init_data[i].data);
696                 }
697
698                 /*
699                  * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
700                  * h/w path of COMP2/COMN1 on CONTROL1 register.
701                  */
702                 if (muic_pdata->path_uart)
703                         info->path_uart = muic_pdata->path_uart;
704                 else
705                         info->path_uart = CONTROL1_SW_UART;
706
707                 if (muic_pdata->path_usb)
708                         info->path_usb = muic_pdata->path_usb;
709                 else
710                         info->path_usb = CONTROL1_SW_USB;
711
712                 /*
713                  * Default delay time for detecting cable state
714                  * after certain time.
715                  */
716                 if (muic_pdata->detcable_delay_ms)
717                         delay_jiffies =
718                                 msecs_to_jiffies(muic_pdata->detcable_delay_ms);
719                 else
720                         delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
721         } else {
722                 info->path_uart = CONTROL1_SW_UART;
723                 info->path_usb = CONTROL1_SW_USB;
724                 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
725         }
726
727         /* Set initial path for UART when JIG is connected to get serial logs */
728         ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
729                                 2, info->status);
730         if (ret) {
731                 dev_err(info->dev, "failed to read MUIC register\n");
732                 return ret;
733         }
734         cable_type = max8997_muic_get_cable_type(info,
735                                            MAX8997_CABLE_GROUP_ADC, &attached);
736         if (attached && cable_type == MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF)
737                 max8997_muic_set_path(info, info->path_uart, true);
738
739         /* Set ADC debounce time */
740         max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
741
742         /*
743          * Detect accessory after completing the initialization of platform
744          *
745          * - Use delayed workqueue to detect cable state and then
746          * notify cable state to notifiee/platform through uevent.
747          * After completing the booting of platform, the extcon provider
748          * driver should notify cable state to upper layer.
749          */
750         INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq);
751         queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
752                         delay_jiffies);
753
754         return 0;
755
756 err_irq:
757         while (--i >= 0)
758                 free_irq(muic_irqs[i].virq, info);
759         return ret;
760 }
761
762 static int max8997_muic_remove(struct platform_device *pdev)
763 {
764         struct max8997_muic_info *info = platform_get_drvdata(pdev);
765         int i;
766
767         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
768                 free_irq(muic_irqs[i].virq, info);
769         cancel_work_sync(&info->irq_work);
770
771         return 0;
772 }
773
774 static struct platform_driver max8997_muic_driver = {
775         .driver         = {
776                 .name   = DEV_NAME,
777         },
778         .probe          = max8997_muic_probe,
779         .remove         = max8997_muic_remove,
780 };
781
782 module_platform_driver(max8997_muic_driver);
783
784 MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
785 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
786 MODULE_LICENSE("GPL");