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-provider.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 */
max8997_muic_set_debounce_time(struct max8997_muic_info * info,enum max8997_muic_adc_debounce_time time)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 */
max8997_muic_set_path(struct max8997_muic_info * info,u8 val,bool attached)204 static int max8997_muic_set_path(struct max8997_muic_info *info,
205 u8 val, bool attached)
206 {
207 int ret;
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 */
max8997_muic_get_cable_type(struct max8997_muic_info * info,enum max8997_muic_cable_group group,bool * attached)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
max8997_muic_handle_usb(struct max8997_muic_info * info,enum max8997_muic_usb_type usb_type,bool attached)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 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 switch (usb_type) {
331 case MAX8997_USB_HOST:
332 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, attached);
333 break;
334 case MAX8997_USB_DEVICE:
335 extcon_set_state_sync(info->edev, EXTCON_USB, attached);
336 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
337 attached);
338 break;
339 default:
340 dev_err(info->dev, "failed to detect %s usb cable\n",
341 attached ? "attached" : "detached");
342 return -EINVAL;
343 }
344
345 return 0;
346 }
347
max8997_muic_handle_dock(struct max8997_muic_info * info,int cable_type,bool attached)348 static int max8997_muic_handle_dock(struct max8997_muic_info *info,
349 int cable_type, bool attached)
350 {
351 int ret = 0;
352
353 ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
354 if (ret) {
355 dev_err(info->dev, "failed to update muic register\n");
356 return ret;
357 }
358
359 switch (cable_type) {
360 case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
361 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
362 extcon_set_state_sync(info->edev, EXTCON_DOCK, attached);
363 break;
364 default:
365 dev_err(info->dev, "failed to detect %s dock device\n",
366 attached ? "attached" : "detached");
367 return -EINVAL;
368 }
369
370 return 0;
371 }
372
max8997_muic_handle_jig_uart(struct max8997_muic_info * info,bool attached)373 static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
374 bool attached)
375 {
376 int ret = 0;
377
378 /* switch to UART */
379 ret = max8997_muic_set_path(info, info->path_uart, attached);
380 if (ret) {
381 dev_err(info->dev, "failed to update muic register\n");
382 return ret;
383 }
384
385 extcon_set_state_sync(info->edev, EXTCON_JIG, attached);
386
387 return 0;
388 }
389
max8997_muic_adc_handler(struct max8997_muic_info * info)390 static int max8997_muic_adc_handler(struct max8997_muic_info *info)
391 {
392 int cable_type;
393 bool attached;
394 int ret = 0;
395
396 /* Check cable state which is either detached or attached */
397 cable_type = max8997_muic_get_cable_type(info,
398 MAX8997_CABLE_GROUP_ADC, &attached);
399
400 switch (cable_type) {
401 case MAX8997_MUIC_ADC_GROUND:
402 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached);
403 if (ret < 0)
404 return ret;
405 break;
406 case MAX8997_MUIC_ADC_MHL:
407 extcon_set_state_sync(info->edev, EXTCON_DISP_MHL, attached);
408 break;
409 case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF:
410 case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON:
411 ret = max8997_muic_handle_usb(info,
412 MAX8997_USB_DEVICE, attached);
413 if (ret < 0)
414 return ret;
415 break;
416 case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
417 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
418 ret = max8997_muic_handle_dock(info, cable_type, attached);
419 if (ret < 0)
420 return ret;
421 break;
422 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF:
423 ret = max8997_muic_handle_jig_uart(info, attached);
424 break;
425 case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON:
426 case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON:
427 case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON:
428 case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON:
429 case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON:
430 case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON:
431 case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON:
432 case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON:
433 case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON:
434 case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON:
435 case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON:
436 case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON:
437 case MAX8997_MUIC_ADC_RESERVED_ACC_1:
438 case MAX8997_MUIC_ADC_RESERVED_ACC_2:
439 case MAX8997_MUIC_ADC_RESERVED_ACC_3:
440 case MAX8997_MUIC_ADC_RESERVED_ACC_4:
441 case MAX8997_MUIC_ADC_RESERVED_ACC_5:
442 case MAX8997_MUIC_ADC_CEA936_AUDIO:
443 case MAX8997_MUIC_ADC_PHONE_POWERED_DEV:
444 case MAX8997_MUIC_ADC_TTY_CONVERTER:
445 case MAX8997_MUIC_ADC_UART_CABLE:
446 case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG:
447 case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG:
448 case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE:
449 /*
450 * This cable isn't used in general case if it is specially
451 * needed to detect additional cable, should implement
452 * proper operation when this cable is attached/detached.
453 */
454 dev_info(info->dev,
455 "cable is %s but it isn't used (type:0x%x)\n",
456 attached ? "attached" : "detached", cable_type);
457 return -EAGAIN;
458 default:
459 dev_err(info->dev,
460 "failed to detect %s unknown cable (type:0x%x)\n",
461 attached ? "attached" : "detached", cable_type);
462 return -EINVAL;
463 }
464
465 return 0;
466 }
467
max8997_muic_chg_handler(struct max8997_muic_info * info)468 static int max8997_muic_chg_handler(struct max8997_muic_info *info)
469 {
470 int chg_type;
471 bool attached;
472 int adc;
473
474 chg_type = max8997_muic_get_cable_type(info,
475 MAX8997_CABLE_GROUP_CHG, &attached);
476
477 switch (chg_type) {
478 case MAX8997_CHARGER_TYPE_NONE:
479 break;
480 case MAX8997_CHARGER_TYPE_USB:
481 adc = info->status[0] & STATUS1_ADC_MASK;
482 adc >>= STATUS1_ADC_SHIFT;
483
484 if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) {
485 max8997_muic_handle_usb(info,
486 MAX8997_USB_DEVICE, attached);
487 }
488 break;
489 case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
490 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP,
491 attached);
492 break;
493 case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
494 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
495 attached);
496 break;
497 case MAX8997_CHARGER_TYPE_500MA:
498 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW,
499 attached);
500 break;
501 case MAX8997_CHARGER_TYPE_1A:
502 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST,
503 attached);
504 break;
505 default:
506 dev_err(info->dev,
507 "failed to detect %s unknown chg cable (type:0x%x)\n",
508 attached ? "attached" : "detached", chg_type);
509 return -EINVAL;
510 }
511
512 return 0;
513 }
514
max8997_muic_irq_work(struct work_struct * work)515 static void max8997_muic_irq_work(struct work_struct *work)
516 {
517 struct max8997_muic_info *info = container_of(work,
518 struct max8997_muic_info, irq_work);
519 int irq_type = 0;
520 int i, ret;
521
522 if (!info->edev)
523 return;
524
525 mutex_lock(&info->mutex);
526
527 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
528 if (info->irq == muic_irqs[i].virq)
529 irq_type = muic_irqs[i].irq;
530
531 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
532 2, info->status);
533 if (ret) {
534 dev_err(info->dev, "failed to read muic register\n");
535 mutex_unlock(&info->mutex);
536 return;
537 }
538
539 switch (irq_type) {
540 case MAX8997_MUICIRQ_ADCError:
541 case MAX8997_MUICIRQ_ADCLow:
542 case MAX8997_MUICIRQ_ADC:
543 /* Handle all of cable except for charger cable */
544 ret = max8997_muic_adc_handler(info);
545 break;
546 case MAX8997_MUICIRQ_VBVolt:
547 case MAX8997_MUICIRQ_DBChg:
548 case MAX8997_MUICIRQ_DCDTmr:
549 case MAX8997_MUICIRQ_ChgDetRun:
550 case MAX8997_MUICIRQ_ChgTyp:
551 /* Handle charger cable */
552 ret = max8997_muic_chg_handler(info);
553 break;
554 case MAX8997_MUICIRQ_OVP:
555 break;
556 default:
557 dev_info(info->dev, "misc interrupt: irq %d occurred\n",
558 irq_type);
559 mutex_unlock(&info->mutex);
560 return;
561 }
562
563 if (ret < 0)
564 dev_err(info->dev, "failed to handle MUIC interrupt\n");
565
566 mutex_unlock(&info->mutex);
567 }
568
max8997_muic_irq_handler(int irq,void * data)569 static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
570 {
571 struct max8997_muic_info *info = data;
572
573 dev_dbg(info->dev, "irq:%d\n", irq);
574 info->irq = irq;
575
576 schedule_work(&info->irq_work);
577
578 return IRQ_HANDLED;
579 }
580
max8997_muic_detect_dev(struct max8997_muic_info * info)581 static int max8997_muic_detect_dev(struct max8997_muic_info *info)
582 {
583 int ret = 0;
584 int adc;
585 int chg_type;
586 bool attached;
587
588 mutex_lock(&info->mutex);
589
590 /* Read STATUSx register to detect accessory */
591 ret = max8997_bulk_read(info->muic,
592 MAX8997_MUIC_REG_STATUS1, 2, info->status);
593 if (ret) {
594 dev_err(info->dev, "failed to read MUIC register\n");
595 mutex_unlock(&info->mutex);
596 return ret;
597 }
598
599 adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC,
600 &attached);
601 if (attached && adc != MAX8997_MUIC_ADC_OPEN) {
602 ret = max8997_muic_adc_handler(info);
603 if (ret < 0) {
604 dev_err(info->dev, "Cannot detect ADC cable\n");
605 mutex_unlock(&info->mutex);
606 return ret;
607 }
608 }
609
610 chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG,
611 &attached);
612 if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) {
613 ret = max8997_muic_chg_handler(info);
614 if (ret < 0) {
615 dev_err(info->dev, "Cannot detect charger cable\n");
616 mutex_unlock(&info->mutex);
617 return ret;
618 }
619 }
620
621 mutex_unlock(&info->mutex);
622
623 return 0;
624 }
625
max8997_muic_detect_cable_wq(struct work_struct * work)626 static void max8997_muic_detect_cable_wq(struct work_struct *work)
627 {
628 struct max8997_muic_info *info = container_of(to_delayed_work(work),
629 struct max8997_muic_info, wq_detcable);
630 int ret;
631
632 ret = max8997_muic_detect_dev(info);
633 if (ret < 0)
634 dev_err(info->dev, "failed to detect cable type\n");
635 }
636
max8997_muic_probe(struct platform_device * pdev)637 static int max8997_muic_probe(struct platform_device *pdev)
638 {
639 struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
640 struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
641 struct max8997_muic_info *info;
642 int delay_jiffies;
643 int ret, i;
644
645 info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info),
646 GFP_KERNEL);
647 if (!info)
648 return -ENOMEM;
649
650 info->dev = &pdev->dev;
651 info->muic = max8997->muic;
652
653 platform_set_drvdata(pdev, info);
654 mutex_init(&info->mutex);
655
656 INIT_WORK(&info->irq_work, max8997_muic_irq_work);
657
658 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
659 struct max8997_muic_irq *muic_irq = &muic_irqs[i];
660 unsigned int virq = 0;
661
662 virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
663 if (!virq) {
664 ret = -EINVAL;
665 goto err_irq;
666 }
667 muic_irq->virq = virq;
668
669 ret = request_threaded_irq(virq, NULL,
670 max8997_muic_irq_handler,
671 IRQF_NO_SUSPEND,
672 muic_irq->name, info);
673 if (ret) {
674 dev_err(&pdev->dev,
675 "failed: irq request (IRQ: %d, error :%d)\n",
676 muic_irq->irq, ret);
677 goto err_irq;
678 }
679 }
680
681 /* External connector */
682 info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable);
683 if (IS_ERR(info->edev)) {
684 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
685 ret = -ENOMEM;
686 goto err_irq;
687 }
688
689 ret = devm_extcon_dev_register(&pdev->dev, info->edev);
690 if (ret) {
691 dev_err(&pdev->dev, "failed to register extcon device\n");
692 goto err_irq;
693 }
694
695 if (pdata && pdata->muic_pdata) {
696 struct max8997_muic_platform_data *muic_pdata
697 = pdata->muic_pdata;
698
699 /* Initialize registers according to platform data */
700 for (i = 0; i < muic_pdata->num_init_data; i++) {
701 max8997_write_reg(info->muic,
702 muic_pdata->init_data[i].addr,
703 muic_pdata->init_data[i].data);
704 }
705
706 /*
707 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
708 * h/w path of COMP2/COMN1 on CONTROL1 register.
709 */
710 if (muic_pdata->path_uart)
711 info->path_uart = muic_pdata->path_uart;
712 else
713 info->path_uart = CONTROL1_SW_UART;
714
715 if (muic_pdata->path_usb)
716 info->path_usb = muic_pdata->path_usb;
717 else
718 info->path_usb = CONTROL1_SW_USB;
719
720 /*
721 * Default delay time for detecting cable state
722 * after certain time.
723 */
724 if (muic_pdata->detcable_delay_ms)
725 delay_jiffies =
726 msecs_to_jiffies(muic_pdata->detcable_delay_ms);
727 else
728 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
729 } else {
730 info->path_uart = CONTROL1_SW_UART;
731 info->path_usb = CONTROL1_SW_USB;
732 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
733 }
734
735 /* Set initial path for UART */
736 max8997_muic_set_path(info, info->path_uart, true);
737
738 /* Set ADC debounce time */
739 max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
740
741 /*
742 * Detect accessory after completing the initialization of platform
743 *
744 * - Use delayed workqueue to detect cable state and then
745 * notify cable state to notifiee/platform through uevent.
746 * After completing the booting of platform, the extcon provider
747 * driver should notify cable state to upper layer.
748 */
749 INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq);
750 queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
751 delay_jiffies);
752
753 return 0;
754
755 err_irq:
756 while (--i >= 0)
757 free_irq(muic_irqs[i].virq, info);
758 return ret;
759 }
760
max8997_muic_remove(struct platform_device * pdev)761 static int max8997_muic_remove(struct platform_device *pdev)
762 {
763 struct max8997_muic_info *info = platform_get_drvdata(pdev);
764 int i;
765
766 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
767 free_irq(muic_irqs[i].virq, info);
768 cancel_work_sync(&info->irq_work);
769
770 return 0;
771 }
772
773 static struct platform_driver max8997_muic_driver = {
774 .driver = {
775 .name = DEV_NAME,
776 },
777 .probe = max8997_muic_probe,
778 .remove = max8997_muic_remove,
779 };
780
781 module_platform_driver(max8997_muic_driver);
782
783 MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
784 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
785 MODULE_LICENSE("GPL");
786 MODULE_ALIAS("platform:max8997-muic");
787