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 */
max8997_muic_set_debounce_time(struct max8997_muic_info * info,enum max8997_muic_adc_debounce_time time)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 */
max8997_muic_set_path(struct max8997_muic_info * info,u8 val,bool attached)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 */
max8997_muic_get_cable_type(struct max8997_muic_info * info,enum max8997_muic_cable_group group,bool * attached)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
max8997_muic_handle_usb(struct max8997_muic_info * info,enum max8997_muic_usb_type usb_type,bool attached)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 ret = max8997_muic_set_path(info, info->path_usb, attached);
324 if (ret < 0) {
325 dev_err(info->dev, "failed to update muic register\n");
326 return ret;
327 }
328
329 switch (usb_type) {
330 case MAX8997_USB_HOST:
331 extcon_set_cable_state_(info->edev, EXTCON_USB_HOST, attached);
332 break;
333 case MAX8997_USB_DEVICE:
334 extcon_set_cable_state_(info->edev, EXTCON_USB, attached);
335 break;
336 default:
337 dev_err(info->dev, "failed to detect %s usb cable\n",
338 attached ? "attached" : "detached");
339 return -EINVAL;
340 }
341
342 return 0;
343 }
344
max8997_muic_handle_dock(struct max8997_muic_info * info,int cable_type,bool attached)345 static int max8997_muic_handle_dock(struct max8997_muic_info *info,
346 int cable_type, bool attached)
347 {
348 int ret = 0;
349
350 ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
351 if (ret) {
352 dev_err(info->dev, "failed to update muic register\n");
353 return ret;
354 }
355
356 switch (cable_type) {
357 case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
358 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
359 extcon_set_cable_state_(info->edev, EXTCON_DOCK, attached);
360 break;
361 default:
362 dev_err(info->dev, "failed to detect %s dock device\n",
363 attached ? "attached" : "detached");
364 return -EINVAL;
365 }
366
367 return 0;
368 }
369
max8997_muic_handle_jig_uart(struct max8997_muic_info * info,bool attached)370 static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
371 bool attached)
372 {
373 int ret = 0;
374
375 /* switch to UART */
376 ret = max8997_muic_set_path(info, info->path_uart, attached);
377 if (ret) {
378 dev_err(info->dev, "failed to update muic register\n");
379 return ret;
380 }
381
382 extcon_set_cable_state_(info->edev, EXTCON_JIG, attached);
383
384 return 0;
385 }
386
max8997_muic_adc_handler(struct max8997_muic_info * info)387 static int max8997_muic_adc_handler(struct max8997_muic_info *info)
388 {
389 int cable_type;
390 bool attached;
391 int ret = 0;
392
393 /* Check cable state which is either detached or attached */
394 cable_type = max8997_muic_get_cable_type(info,
395 MAX8997_CABLE_GROUP_ADC, &attached);
396
397 switch (cable_type) {
398 case MAX8997_MUIC_ADC_GROUND:
399 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached);
400 if (ret < 0)
401 return ret;
402 break;
403 case MAX8997_MUIC_ADC_MHL:
404 extcon_set_cable_state_(info->edev, EXTCON_DISP_MHL, attached);
405 break;
406 case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF:
407 case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON:
408 ret = max8997_muic_handle_usb(info,
409 MAX8997_USB_DEVICE, attached);
410 if (ret < 0)
411 return ret;
412 break;
413 case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
414 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
415 ret = max8997_muic_handle_dock(info, cable_type, attached);
416 if (ret < 0)
417 return ret;
418 break;
419 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF:
420 ret = max8997_muic_handle_jig_uart(info, attached);
421 break;
422 case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON:
423 case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON:
424 case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON:
425 case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON:
426 case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON:
427 case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON:
428 case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON:
429 case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON:
430 case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON:
431 case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON:
432 case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON:
433 case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON:
434 case MAX8997_MUIC_ADC_RESERVED_ACC_1:
435 case MAX8997_MUIC_ADC_RESERVED_ACC_2:
436 case MAX8997_MUIC_ADC_RESERVED_ACC_3:
437 case MAX8997_MUIC_ADC_RESERVED_ACC_4:
438 case MAX8997_MUIC_ADC_RESERVED_ACC_5:
439 case MAX8997_MUIC_ADC_CEA936_AUDIO:
440 case MAX8997_MUIC_ADC_PHONE_POWERED_DEV:
441 case MAX8997_MUIC_ADC_TTY_CONVERTER:
442 case MAX8997_MUIC_ADC_UART_CABLE:
443 case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG:
444 case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG:
445 case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE:
446 /*
447 * This cable isn't used in general case if it is specially
448 * needed to detect additional cable, should implement
449 * proper operation when this cable is attached/detached.
450 */
451 dev_info(info->dev,
452 "cable is %s but it isn't used (type:0x%x)\n",
453 attached ? "attached" : "detached", cable_type);
454 return -EAGAIN;
455 default:
456 dev_err(info->dev,
457 "failed to detect %s unknown cable (type:0x%x)\n",
458 attached ? "attached" : "detached", cable_type);
459 return -EINVAL;
460 }
461
462 return 0;
463 }
464
max8997_muic_chg_handler(struct max8997_muic_info * info)465 static int max8997_muic_chg_handler(struct max8997_muic_info *info)
466 {
467 int chg_type;
468 bool attached;
469 int adc;
470
471 chg_type = max8997_muic_get_cable_type(info,
472 MAX8997_CABLE_GROUP_CHG, &attached);
473
474 switch (chg_type) {
475 case MAX8997_CHARGER_TYPE_NONE:
476 break;
477 case MAX8997_CHARGER_TYPE_USB:
478 adc = info->status[0] & STATUS1_ADC_MASK;
479 adc >>= STATUS1_ADC_SHIFT;
480
481 if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) {
482 max8997_muic_handle_usb(info,
483 MAX8997_USB_DEVICE, attached);
484 }
485 break;
486 case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
487 extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_CDP,
488 attached);
489 break;
490 case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
491 extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_DCP,
492 attached);
493 break;
494 case MAX8997_CHARGER_TYPE_500MA:
495 extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_SLOW,
496 attached);
497 break;
498 case MAX8997_CHARGER_TYPE_1A:
499 extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_FAST,
500 attached);
501 break;
502 default:
503 dev_err(info->dev,
504 "failed to detect %s unknown chg cable (type:0x%x)\n",
505 attached ? "attached" : "detached", chg_type);
506 return -EINVAL;
507 }
508
509 return 0;
510 }
511
max8997_muic_irq_work(struct work_struct * work)512 static void max8997_muic_irq_work(struct work_struct *work)
513 {
514 struct max8997_muic_info *info = container_of(work,
515 struct max8997_muic_info, irq_work);
516 int irq_type = 0;
517 int i, ret;
518
519 if (!info->edev)
520 return;
521
522 mutex_lock(&info->mutex);
523
524 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
525 if (info->irq == muic_irqs[i].virq)
526 irq_type = muic_irqs[i].irq;
527
528 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
529 2, info->status);
530 if (ret) {
531 dev_err(info->dev, "failed to read muic register\n");
532 mutex_unlock(&info->mutex);
533 return;
534 }
535
536 switch (irq_type) {
537 case MAX8997_MUICIRQ_ADCError:
538 case MAX8997_MUICIRQ_ADCLow:
539 case MAX8997_MUICIRQ_ADC:
540 /* Handle all of cable except for charger cable */
541 ret = max8997_muic_adc_handler(info);
542 break;
543 case MAX8997_MUICIRQ_VBVolt:
544 case MAX8997_MUICIRQ_DBChg:
545 case MAX8997_MUICIRQ_DCDTmr:
546 case MAX8997_MUICIRQ_ChgDetRun:
547 case MAX8997_MUICIRQ_ChgTyp:
548 /* Handle charger cable */
549 ret = max8997_muic_chg_handler(info);
550 break;
551 case MAX8997_MUICIRQ_OVP:
552 break;
553 default:
554 dev_info(info->dev, "misc interrupt: irq %d occurred\n",
555 irq_type);
556 mutex_unlock(&info->mutex);
557 return;
558 }
559
560 if (ret < 0)
561 dev_err(info->dev, "failed to handle MUIC interrupt\n");
562
563 mutex_unlock(&info->mutex);
564 }
565
max8997_muic_irq_handler(int irq,void * data)566 static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
567 {
568 struct max8997_muic_info *info = data;
569
570 dev_dbg(info->dev, "irq:%d\n", irq);
571 info->irq = irq;
572
573 schedule_work(&info->irq_work);
574
575 return IRQ_HANDLED;
576 }
577
max8997_muic_detect_dev(struct max8997_muic_info * info)578 static int max8997_muic_detect_dev(struct max8997_muic_info *info)
579 {
580 int ret = 0;
581 int adc;
582 int chg_type;
583 bool attached;
584
585 mutex_lock(&info->mutex);
586
587 /* Read STATUSx register to detect accessory */
588 ret = max8997_bulk_read(info->muic,
589 MAX8997_MUIC_REG_STATUS1, 2, info->status);
590 if (ret) {
591 dev_err(info->dev, "failed to read MUIC register\n");
592 mutex_unlock(&info->mutex);
593 return ret;
594 }
595
596 adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC,
597 &attached);
598 if (attached && adc != MAX8997_MUIC_ADC_OPEN) {
599 ret = max8997_muic_adc_handler(info);
600 if (ret < 0) {
601 dev_err(info->dev, "Cannot detect ADC cable\n");
602 mutex_unlock(&info->mutex);
603 return ret;
604 }
605 }
606
607 chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG,
608 &attached);
609 if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) {
610 ret = max8997_muic_chg_handler(info);
611 if (ret < 0) {
612 dev_err(info->dev, "Cannot detect charger cable\n");
613 mutex_unlock(&info->mutex);
614 return ret;
615 }
616 }
617
618 mutex_unlock(&info->mutex);
619
620 return 0;
621 }
622
max8997_muic_detect_cable_wq(struct work_struct * work)623 static void max8997_muic_detect_cable_wq(struct work_struct *work)
624 {
625 struct max8997_muic_info *info = container_of(to_delayed_work(work),
626 struct max8997_muic_info, wq_detcable);
627 int ret;
628
629 ret = max8997_muic_detect_dev(info);
630 if (ret < 0)
631 dev_err(info->dev, "failed to detect cable type\n");
632 }
633
max8997_muic_probe(struct platform_device * pdev)634 static int max8997_muic_probe(struct platform_device *pdev)
635 {
636 struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
637 struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
638 struct max8997_muic_info *info;
639 int delay_jiffies;
640 int ret, i;
641
642 info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info),
643 GFP_KERNEL);
644 if (!info)
645 return -ENOMEM;
646
647 info->dev = &pdev->dev;
648 info->muic = max8997->muic;
649
650 platform_set_drvdata(pdev, info);
651 mutex_init(&info->mutex);
652
653 INIT_WORK(&info->irq_work, max8997_muic_irq_work);
654
655 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
656 struct max8997_muic_irq *muic_irq = &muic_irqs[i];
657 unsigned int virq = 0;
658
659 virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
660 if (!virq) {
661 ret = -EINVAL;
662 goto err_irq;
663 }
664 muic_irq->virq = virq;
665
666 ret = request_threaded_irq(virq, NULL,
667 max8997_muic_irq_handler,
668 IRQF_NO_SUSPEND,
669 muic_irq->name, info);
670 if (ret) {
671 dev_err(&pdev->dev,
672 "failed: irq request (IRQ: %d, error :%d)\n",
673 muic_irq->irq, ret);
674 goto err_irq;
675 }
676 }
677
678 /* External connector */
679 info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable);
680 if (IS_ERR(info->edev)) {
681 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
682 ret = -ENOMEM;
683 goto err_irq;
684 }
685
686 ret = devm_extcon_dev_register(&pdev->dev, info->edev);
687 if (ret) {
688 dev_err(&pdev->dev, "failed to register extcon device\n");
689 goto err_irq;
690 }
691
692 if (pdata && pdata->muic_pdata) {
693 struct max8997_muic_platform_data *muic_pdata
694 = pdata->muic_pdata;
695
696 /* Initialize registers according to platform data */
697 for (i = 0; i < muic_pdata->num_init_data; i++) {
698 max8997_write_reg(info->muic,
699 muic_pdata->init_data[i].addr,
700 muic_pdata->init_data[i].data);
701 }
702
703 /*
704 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
705 * h/w path of COMP2/COMN1 on CONTROL1 register.
706 */
707 if (muic_pdata->path_uart)
708 info->path_uart = muic_pdata->path_uart;
709 else
710 info->path_uart = CONTROL1_SW_UART;
711
712 if (muic_pdata->path_usb)
713 info->path_usb = muic_pdata->path_usb;
714 else
715 info->path_usb = CONTROL1_SW_USB;
716
717 /*
718 * Default delay time for detecting cable state
719 * after certain time.
720 */
721 if (muic_pdata->detcable_delay_ms)
722 delay_jiffies =
723 msecs_to_jiffies(muic_pdata->detcable_delay_ms);
724 else
725 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
726 } else {
727 info->path_uart = CONTROL1_SW_UART;
728 info->path_usb = CONTROL1_SW_USB;
729 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
730 }
731
732 /* Set initial path for UART */
733 max8997_muic_set_path(info, info->path_uart, true);
734
735 /* Set ADC debounce time */
736 max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
737
738 /*
739 * Detect accessory after completing the initialization of platform
740 *
741 * - Use delayed workqueue to detect cable state and then
742 * notify cable state to notifiee/platform through uevent.
743 * After completing the booting of platform, the extcon provider
744 * driver should notify cable state to upper layer.
745 */
746 INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq);
747 queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
748 delay_jiffies);
749
750 return 0;
751
752 err_irq:
753 while (--i >= 0)
754 free_irq(muic_irqs[i].virq, info);
755 return ret;
756 }
757
max8997_muic_remove(struct platform_device * pdev)758 static int max8997_muic_remove(struct platform_device *pdev)
759 {
760 struct max8997_muic_info *info = platform_get_drvdata(pdev);
761 int i;
762
763 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
764 free_irq(muic_irqs[i].virq, info);
765 cancel_work_sync(&info->irq_work);
766
767 return 0;
768 }
769
770 static struct platform_driver max8997_muic_driver = {
771 .driver = {
772 .name = DEV_NAME,
773 },
774 .probe = max8997_muic_probe,
775 .remove = max8997_muic_remove,
776 };
777
778 module_platform_driver(max8997_muic_driver);
779
780 MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
781 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
782 MODULE_LICENSE("GPL");
783 MODULE_ALIAS("platform:max8997-muic");
784