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Linux 4.1.16
[linux/fpc-iii.git] / drivers / extcon / extcon-max8997.c
blob5774e56c64222a43f21eb28e9baeecc79bc176e1
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 enum {
149 EXTCON_CABLE_USB = 0,
150 EXTCON_CABLE_USB_HOST,
151 EXTCON_CABLE_TA,
152 EXTCON_CABLE_FAST_CHARGER,
153 EXTCON_CABLE_SLOW_CHARGER,
154 EXTCON_CABLE_CHARGE_DOWNSTREAM,
155 EXTCON_CABLE_MHL,
156 EXTCON_CABLE_DOCK_DESK,
157 EXTCON_CABLE_DOCK_CARD,
158 EXTCON_CABLE_JIG,
159
160 _EXTCON_CABLE_NUM,
161 };
162
163 static const char *max8997_extcon_cable[] = {
164 [EXTCON_CABLE_USB] = "USB",
165 [EXTCON_CABLE_USB_HOST] = "USB-Host",
166 [EXTCON_CABLE_TA] = "TA",
167 [EXTCON_CABLE_FAST_CHARGER] = "Fast-charger",
168 [EXTCON_CABLE_SLOW_CHARGER] = "Slow-charger",
169 [EXTCON_CABLE_CHARGE_DOWNSTREAM] = "Charge-downstream",
170 [EXTCON_CABLE_MHL] = "MHL",
171 [EXTCON_CABLE_DOCK_DESK] = "Dock-Desk",
172 [EXTCON_CABLE_DOCK_CARD] = "Dock-Card",
173 [EXTCON_CABLE_JIG] = "JIG",
174
175 NULL,
176 };
177
178 /*
179 * max8997_muic_set_debounce_time - Set the debounce time of ADC
180 * @info: the instance including private data of max8997 MUIC
181 * @time: the debounce time of ADC
182 */
183 static int max8997_muic_set_debounce_time(struct max8997_muic_info *info,
184 enum max8997_muic_adc_debounce_time time)
185 {
186 int ret;
187
188 switch (time) {
189 case ADC_DEBOUNCE_TIME_0_5MS:
190 case ADC_DEBOUNCE_TIME_10MS:
191 case ADC_DEBOUNCE_TIME_25MS:
192 case ADC_DEBOUNCE_TIME_38_62MS:
193 ret = max8997_update_reg(info->muic,
194 MAX8997_MUIC_REG_CONTROL3,
195 time << CONTROL3_ADCDBSET_SHIFT,
196 CONTROL3_ADCDBSET_MASK);
197 if (ret) {
198 dev_err(info->dev, "failed to set ADC debounce time\n");
199 return ret;
200 }
201 break;
202 default:
203 dev_err(info->dev, "invalid ADC debounce time\n");
204 return -EINVAL;
205 }
206
207 return 0;
208 };
209
210 /*
211 * max8997_muic_set_path - Set hardware line according to attached cable
212 * @info: the instance including private data of max8997 MUIC
213 * @value: the path according to attached cable
214 * @attached: the state of cable (true:attached, false:detached)
215 *
216 * The max8997 MUIC device share outside H/W line among a varity of cables,
217 * so this function set internal path of H/W line according to the type of
218 * attached cable.
219 */
220 static int max8997_muic_set_path(struct max8997_muic_info *info,
221 u8 val, bool attached)
222 {
223 int ret = 0;
224 u8 ctrl1, ctrl2 = 0;
225
226 if (attached)
227 ctrl1 = val;
228 else
229 ctrl1 = CONTROL1_SW_OPEN;
230
231 ret = max8997_update_reg(info->muic,
232 MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK);
233 if (ret < 0) {
234 dev_err(info->dev, "failed to update MUIC register\n");
235 return ret;
236 }
237
238 if (attached)
239 ctrl2 |= CONTROL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */
240 else
241 ctrl2 |= CONTROL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */
242
243 ret = max8997_update_reg(info->muic,
244 MAX8997_MUIC_REG_CONTROL2, ctrl2,
245 CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK);
246 if (ret < 0) {
247 dev_err(info->dev, "failed to update MUIC register\n");
248 return ret;
249 }
250
251 dev_info(info->dev,
252 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
253 ctrl1, ctrl2, attached ? "attached" : "detached");
254
255 return 0;
256 }
257
258 /*
259 * max8997_muic_get_cable_type - Return cable type and check cable state
260 * @info: the instance including private data of max8997 MUIC
261 * @group: the path according to attached cable
262 * @attached: store cable state and return
263 *
264 * This function check the cable state either attached or detached,
265 * and then divide precise type of cable according to cable group.
266 * - MAX8997_CABLE_GROUP_ADC
267 * - MAX8997_CABLE_GROUP_CHG
268 */
269 static int max8997_muic_get_cable_type(struct max8997_muic_info *info,
270 enum max8997_muic_cable_group group, bool *attached)
271 {
272 int cable_type = 0;
273 int adc;
274 int chg_type;
275
276 switch (group) {
277 case MAX8997_CABLE_GROUP_ADC:
278 /*
279 * Read ADC value to check cable type and decide cable state
280 * according to cable type
281 */
282 adc = info->status[0] & STATUS1_ADC_MASK;
283 adc >>= STATUS1_ADC_SHIFT;
284
285 /*
286 * Check current cable state/cable type and store cable type
287 * (info->prev_cable_type) for handling cable when cable is
288 * detached.
289 */
290 if (adc == MAX8997_MUIC_ADC_OPEN) {
291 *attached = false;
292
293 cable_type = info->prev_cable_type;
294 info->prev_cable_type = MAX8997_MUIC_ADC_OPEN;
295 } else {
296 *attached = true;
297
298 cable_type = info->prev_cable_type = adc;
299 }
300 break;
301 case MAX8997_CABLE_GROUP_CHG:
302 /*
303 * Read charger type to check cable type and decide cable state
304 * according to type of charger cable.
305 */
306 chg_type = info->status[1] & STATUS2_CHGTYP_MASK;
307 chg_type >>= STATUS2_CHGTYP_SHIFT;
308
309 if (chg_type == MAX8997_CHARGER_TYPE_NONE) {
310 *attached = false;
311
312 cable_type = info->prev_chg_type;
313 info->prev_chg_type = MAX8997_CHARGER_TYPE_NONE;
314 } else {
315 *attached = true;
316
317 /*
318 * Check current cable state/cable type and store cable
319 * type(info->prev_chg_type) for handling cable when
320 * charger cable is detached.
321 */
322 cable_type = info->prev_chg_type = chg_type;
323 }
324
325 break;
326 default:
327 dev_err(info->dev, "Unknown cable group (%d)\n", group);
328 cable_type = -EINVAL;
329 break;
330 }
331
332 return cable_type;
333 }
334
335 static int max8997_muic_handle_usb(struct max8997_muic_info *info,
336 enum max8997_muic_usb_type usb_type, bool attached)
337 {
338 int ret = 0;
339
340 if (usb_type == MAX8997_USB_HOST) {
341 ret = max8997_muic_set_path(info, info->path_usb, attached);
342 if (ret < 0) {
343 dev_err(info->dev, "failed to update muic register\n");
344 return ret;
345 }
346 }
347
348 switch (usb_type) {
349 case MAX8997_USB_HOST:
350 extcon_set_cable_state(info->edev, "USB-Host", attached);
351 break;
352 case MAX8997_USB_DEVICE:
353 extcon_set_cable_state(info->edev, "USB", attached);
354 break;
355 default:
356 dev_err(info->dev, "failed to detect %s usb cable\n",
357 attached ? "attached" : "detached");
358 return -EINVAL;
359 }
360
361 return 0;
362 }
363
364 static int max8997_muic_handle_dock(struct max8997_muic_info *info,
365 int cable_type, bool attached)
366 {
367 int ret = 0;
368
369 ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
370 if (ret) {
371 dev_err(info->dev, "failed to update muic register\n");
372 return ret;
373 }
374
375 switch (cable_type) {
376 case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
377 extcon_set_cable_state(info->edev, "Dock-desk", attached);
378 break;
379 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
380 extcon_set_cable_state(info->edev, "Dock-card", attached);
381 break;
382 default:
383 dev_err(info->dev, "failed to detect %s dock device\n",
384 attached ? "attached" : "detached");
385 return -EINVAL;
386 }
387
388 return 0;
389 }
390
391 static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
392 bool attached)
393 {
394 int ret = 0;
395
396 /* switch to UART */
397 ret = max8997_muic_set_path(info, info->path_uart, attached);
398 if (ret) {
399 dev_err(info->dev, "failed to update muic register\n");
400 return ret;
401 }
402
403 extcon_set_cable_state(info->edev, "JIG", attached);
404
405 return 0;
406 }
407
408 static int max8997_muic_adc_handler(struct max8997_muic_info *info)
409 {
410 int cable_type;
411 bool attached;
412 int ret = 0;
413
414 /* Check cable state which is either detached or attached */
415 cable_type = max8997_muic_get_cable_type(info,
416 MAX8997_CABLE_GROUP_ADC, &attached);
417
418 switch (cable_type) {
419 case MAX8997_MUIC_ADC_GROUND:
420 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached);
421 if (ret < 0)
422 return ret;
423 break;
424 case MAX8997_MUIC_ADC_MHL:
425 extcon_set_cable_state(info->edev, "MHL", attached);
426 break;
427 case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF:
428 case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON:
429 ret = max8997_muic_handle_usb(info,
430 MAX8997_USB_DEVICE, attached);
431 if (ret < 0)
432 return ret;
433 break;
434 case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
435 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
436 ret = max8997_muic_handle_dock(info, cable_type, attached);
437 if (ret < 0)
438 return ret;
439 break;
440 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF:
441 ret = max8997_muic_handle_jig_uart(info, attached);
442 break;
443 case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON:
444 case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON:
445 case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON:
446 case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON:
447 case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON:
448 case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON:
449 case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON:
450 case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON:
451 case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON:
452 case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON:
453 case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON:
454 case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON:
455 case MAX8997_MUIC_ADC_RESERVED_ACC_1:
456 case MAX8997_MUIC_ADC_RESERVED_ACC_2:
457 case MAX8997_MUIC_ADC_RESERVED_ACC_3:
458 case MAX8997_MUIC_ADC_RESERVED_ACC_4:
459 case MAX8997_MUIC_ADC_RESERVED_ACC_5:
460 case MAX8997_MUIC_ADC_CEA936_AUDIO:
461 case MAX8997_MUIC_ADC_PHONE_POWERED_DEV:
462 case MAX8997_MUIC_ADC_TTY_CONVERTER:
463 case MAX8997_MUIC_ADC_UART_CABLE:
464 case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG:
465 case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG:
466 case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE:
467 /*
468 * This cable isn't used in general case if it is specially
469 * needed to detect additional cable, should implement
470 * proper operation when this cable is attached/detached.
471 */
472 dev_info(info->dev,
473 "cable is %s but it isn't used (type:0x%x)\n",
474 attached ? "attached" : "detached", cable_type);
475 return -EAGAIN;
476 default:
477 dev_err(info->dev,
478 "failed to detect %s unknown cable (type:0x%x)\n",
479 attached ? "attached" : "detached", cable_type);
480 return -EINVAL;
481 }
482
483 return 0;
484 }
485
486 static int max8997_muic_chg_handler(struct max8997_muic_info *info)
487 {
488 int chg_type;
489 bool attached;
490 int adc;
491
492 chg_type = max8997_muic_get_cable_type(info,
493 MAX8997_CABLE_GROUP_CHG, &attached);
494
495 switch (chg_type) {
496 case MAX8997_CHARGER_TYPE_NONE:
497 break;
498 case MAX8997_CHARGER_TYPE_USB:
499 adc = info->status[0] & STATUS1_ADC_MASK;
500 adc >>= STATUS1_ADC_SHIFT;
501
502 if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) {
503 max8997_muic_handle_usb(info,
504 MAX8997_USB_DEVICE, attached);
505 }
506 break;
507 case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
508 extcon_set_cable_state(info->edev,
509 "Charge-downstream", attached);
510 break;
511 case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
512 extcon_set_cable_state(info->edev, "TA", attached);
513 break;
514 case MAX8997_CHARGER_TYPE_500MA:
515 extcon_set_cable_state(info->edev, "Slow-charger", attached);
516 break;
517 case MAX8997_CHARGER_TYPE_1A:
518 extcon_set_cable_state(info->edev, "Fast-charger", attached);
519 break;
520 default:
521 dev_err(info->dev,
522 "failed to detect %s unknown chg cable (type:0x%x)\n",
523 attached ? "attached" : "detached", chg_type);
524 return -EINVAL;
525 }
526
527 return 0;
528 }
529
530 static void max8997_muic_irq_work(struct work_struct *work)
531 {
532 struct max8997_muic_info *info = container_of(work,
533 struct max8997_muic_info, irq_work);
534 int irq_type = 0;
535 int i, ret;
536
537 if (!info->edev)
538 return;
539
540 mutex_lock(&info->mutex);
541
542 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
543 if (info->irq == muic_irqs[i].virq)
544 irq_type = muic_irqs[i].irq;
545
546 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
547 2, info->status);
548 if (ret) {
549 dev_err(info->dev, "failed to read muic register\n");
550 mutex_unlock(&info->mutex);
551 return;
552 }
553
554 switch (irq_type) {
555 case MAX8997_MUICIRQ_ADCError:
556 case MAX8997_MUICIRQ_ADCLow:
557 case MAX8997_MUICIRQ_ADC:
558 /* Handle all of cable except for charger cable */
559 ret = max8997_muic_adc_handler(info);
560 break;
561 case MAX8997_MUICIRQ_VBVolt:
562 case MAX8997_MUICIRQ_DBChg:
563 case MAX8997_MUICIRQ_DCDTmr:
564 case MAX8997_MUICIRQ_ChgDetRun:
565 case MAX8997_MUICIRQ_ChgTyp:
566 /* Handle charger cable */
567 ret = max8997_muic_chg_handler(info);
568 break;
569 case MAX8997_MUICIRQ_OVP:
570 break;
571 default:
572 dev_info(info->dev, "misc interrupt: irq %d occurred\n",
573 irq_type);
574 mutex_unlock(&info->mutex);
575 return;
576 }
577
578 if (ret < 0)
579 dev_err(info->dev, "failed to handle MUIC interrupt\n");
580
581 mutex_unlock(&info->mutex);
582 }
583
584 static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
585 {
586 struct max8997_muic_info *info = data;
587
588 dev_dbg(info->dev, "irq:%d\n", irq);
589 info->irq = irq;
590
591 schedule_work(&info->irq_work);
592
593 return IRQ_HANDLED;
594 }
595
596 static int max8997_muic_detect_dev(struct max8997_muic_info *info)
597 {
598 int ret = 0;
599 int adc;
600 int chg_type;
601 bool attached;
602
603 mutex_lock(&info->mutex);
604
605 /* Read STATUSx register to detect accessory */
606 ret = max8997_bulk_read(info->muic,
607 MAX8997_MUIC_REG_STATUS1, 2, info->status);
608 if (ret) {
609 dev_err(info->dev, "failed to read MUIC register\n");
610 mutex_unlock(&info->mutex);
611 return ret;
612 }
613
614 adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC,
615 &attached);
616 if (attached && adc != MAX8997_MUIC_ADC_OPEN) {
617 ret = max8997_muic_adc_handler(info);
618 if (ret < 0) {
619 dev_err(info->dev, "Cannot detect ADC cable\n");
620 mutex_unlock(&info->mutex);
621 return ret;
622 }
623 }
624
625 chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG,
626 &attached);
627 if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) {
628 ret = max8997_muic_chg_handler(info);
629 if (ret < 0) {
630 dev_err(info->dev, "Cannot detect charger cable\n");
631 mutex_unlock(&info->mutex);
632 return ret;
633 }
634 }
635
636 mutex_unlock(&info->mutex);
637
638 return 0;
639 }
640
641 static void max8997_muic_detect_cable_wq(struct work_struct *work)
642 {
643 struct max8997_muic_info *info = container_of(to_delayed_work(work),
644 struct max8997_muic_info, wq_detcable);
645 int ret;
646
647 ret = max8997_muic_detect_dev(info);
648 if (ret < 0)
649 dev_err(info->dev, "failed to detect cable type\n");
650 }
651
652 static int max8997_muic_probe(struct platform_device *pdev)
653 {
654 struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
655 struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
656 struct max8997_muic_info *info;
657 int delay_jiffies;
658 int ret, i;
659
660 info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info),
661 GFP_KERNEL);
662 if (!info)
663 return -ENOMEM;
664
665 info->dev = &pdev->dev;
666 info->muic = max8997->muic;
667
668 platform_set_drvdata(pdev, info);
669 mutex_init(&info->mutex);
670
671 INIT_WORK(&info->irq_work, max8997_muic_irq_work);
672
673 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
674 struct max8997_muic_irq *muic_irq = &muic_irqs[i];
675 unsigned int virq = 0;
676
677 virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
678 if (!virq) {
679 ret = -EINVAL;
680 goto err_irq;
681 }
682 muic_irq->virq = virq;
683
684 ret = request_threaded_irq(virq, NULL,
685 max8997_muic_irq_handler,
686 IRQF_NO_SUSPEND,
687 muic_irq->name, info);
688 if (ret) {
689 dev_err(&pdev->dev,
690 "failed: irq request (IRQ: %d, error :%d)\n",
691 muic_irq->irq, ret);
692 goto err_irq;
693 }
694 }
695
696 /* External connector */
697 info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable);
698 if (IS_ERR(info->edev)) {
699 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
700 ret = -ENOMEM;
701 goto err_irq;
702 }
703 info->edev->name = DEV_NAME;
704
705 ret = devm_extcon_dev_register(&pdev->dev, info->edev);
706 if (ret) {
707 dev_err(&pdev->dev, "failed to register extcon device\n");
708 goto err_irq;
709 }
710
711 if (pdata && pdata->muic_pdata) {
712 struct max8997_muic_platform_data *muic_pdata
713 = pdata->muic_pdata;
714
715 /* Initialize registers according to platform data */
716 for (i = 0; i < muic_pdata->num_init_data; i++) {
717 max8997_write_reg(info->muic,
718 muic_pdata->init_data[i].addr,
719 muic_pdata->init_data[i].data);
720 }
721
722 /*
723 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
724 * h/w path of COMP2/COMN1 on CONTROL1 register.
725 */
726 if (muic_pdata->path_uart)
727 info->path_uart = muic_pdata->path_uart;
728 else
729 info->path_uart = CONTROL1_SW_UART;
730
731 if (muic_pdata->path_usb)
732 info->path_usb = muic_pdata->path_usb;
733 else
734 info->path_usb = CONTROL1_SW_USB;
735
736 /*
737 * Default delay time for detecting cable state
738 * after certain time.
739 */
740 if (muic_pdata->detcable_delay_ms)
741 delay_jiffies =
742 msecs_to_jiffies(muic_pdata->detcable_delay_ms);
743 else
744 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
745 } else {
746 info->path_uart = CONTROL1_SW_UART;
747 info->path_usb = CONTROL1_SW_USB;
748 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
749 }
750
751 /* Set initial path for UART */
752 max8997_muic_set_path(info, info->path_uart, true);
753
754 /* Set ADC debounce time */
755 max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
756
757 /*
758 * Detect accessory after completing the initialization of platform
759 *
760 * - Use delayed workqueue to detect cable state and then
761 * notify cable state to notifiee/platform through uevent.
762 * After completing the booting of platform, the extcon provider
763 * driver should notify cable state to upper layer.
764 */
765 INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq);
766 queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
767 delay_jiffies);
768
769 return 0;
770
771 err_irq:
772 while (--i >= 0)
773 free_irq(muic_irqs[i].virq, info);
774 return ret;
775 }
776
777 static int max8997_muic_remove(struct platform_device *pdev)
778 {
779 struct max8997_muic_info *info = platform_get_drvdata(pdev);
780 int i;
781
782 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
783 free_irq(muic_irqs[i].virq, info);
784 cancel_work_sync(&info->irq_work);
785
786 return 0;
787 }
788
789 static struct platform_driver max8997_muic_driver = {
790 .driver = {
791 .name = DEV_NAME,
792 },
793 .probe = max8997_muic_probe,
794 .remove = max8997_muic_remove,
795 };
796
797 module_platform_driver(max8997_muic_driver);
798
799 MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
800 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
801 MODULE_LICENSE("GPL");
Linux with added FPC-III support