1 /*
2 * extcon-max14577.c - MAX14577/77836 extcon driver to support MUIC
3 *
4 * Copyright (C) 2013,2014 Samsung Electronics
5 * Chanwoo Choi <cw00.choi@samsung.com>
6 * Krzysztof Kozlowski <krzk@kernel.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/i2c.h>
22 #include <linux/interrupt.h>
23 #include <linux/platform_device.h>
24 #include <linux/mfd/max14577.h>
25 #include <linux/mfd/max14577-private.h>
26 #include <linux/extcon-provider.h>
27
28 #define DELAY_MS_DEFAULT 17000 /* unit: millisecond */
29
30 enum max14577_muic_adc_debounce_time {
31 ADC_DEBOUNCE_TIME_5MS = 0,
32 ADC_DEBOUNCE_TIME_10MS,
33 ADC_DEBOUNCE_TIME_25MS,
34 ADC_DEBOUNCE_TIME_38_62MS,
35 };
36
37 enum max14577_muic_status {
38 MAX14577_MUIC_STATUS1 = 0,
39 MAX14577_MUIC_STATUS2 = 1,
40 MAX14577_MUIC_STATUS_END,
41 };
42
43 /**
44 * struct max14577_muic_irq
45 * @irq: the index of irq list of MUIC device.
46 * @name: the name of irq.
47 * @virq: the virtual irq to use irq domain
48 */
49 struct max14577_muic_irq {
50 unsigned int irq;
51 const char *name;
52 unsigned int virq;
53 };
54
55 static struct max14577_muic_irq max14577_muic_irqs[] = {
56 { MAX14577_IRQ_INT1_ADC, "muic-ADC" },
57 { MAX14577_IRQ_INT1_ADCLOW, "muic-ADCLOW" },
58 { MAX14577_IRQ_INT1_ADCERR, "muic-ADCError" },
59 { MAX14577_IRQ_INT2_CHGTYP, "muic-CHGTYP" },
60 { MAX14577_IRQ_INT2_CHGDETRUN, "muic-CHGDETRUN" },
61 { MAX14577_IRQ_INT2_DCDTMR, "muic-DCDTMR" },
62 { MAX14577_IRQ_INT2_DBCHG, "muic-DBCHG" },
63 { MAX14577_IRQ_INT2_VBVOLT, "muic-VBVOLT" },
64 };
65
66 static struct max14577_muic_irq max77836_muic_irqs[] = {
67 { MAX14577_IRQ_INT1_ADC, "muic-ADC" },
68 { MAX14577_IRQ_INT1_ADCLOW, "muic-ADCLOW" },
69 { MAX14577_IRQ_INT1_ADCERR, "muic-ADCError" },
70 { MAX77836_IRQ_INT1_ADC1K, "muic-ADC1K" },
71 { MAX14577_IRQ_INT2_CHGTYP, "muic-CHGTYP" },
72 { MAX14577_IRQ_INT2_CHGDETRUN, "muic-CHGDETRUN" },
73 { MAX14577_IRQ_INT2_DCDTMR, "muic-DCDTMR" },
74 { MAX14577_IRQ_INT2_DBCHG, "muic-DBCHG" },
75 { MAX14577_IRQ_INT2_VBVOLT, "muic-VBVOLT" },
76 { MAX77836_IRQ_INT2_VIDRM, "muic-VIDRM" },
77 };
78
79 struct max14577_muic_info {
80 struct device *dev;
81 struct max14577 *max14577;
82 struct extcon_dev *edev;
83 int prev_cable_type;
84 int prev_chg_type;
85 u8 status[MAX14577_MUIC_STATUS_END];
86
87 struct max14577_muic_irq *muic_irqs;
88 unsigned int muic_irqs_num;
89 bool irq_adc;
90 bool irq_chg;
91 struct work_struct irq_work;
92 struct mutex mutex;
93
94 /*
95 * Use delayed workqueue to detect cable state and then
96 * notify cable state to notifiee/platform through uevent.
97 * After completing the booting of platform, the extcon provider
98 * driver should notify cable state to upper layer.
99 */
100 struct delayed_work wq_detcable;
101
102 /*
103 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
104 * h/w path of COMP2/COMN1 on CONTROL1 register.
105 */
106 int path_usb;
107 int path_uart;
108 };
109
110 enum max14577_muic_cable_group {
111 MAX14577_CABLE_GROUP_ADC = 0,
112 MAX14577_CABLE_GROUP_CHG,
113 };
114
115 /* Define supported accessory type */
116 enum max14577_muic_acc_type {
117 MAX14577_MUIC_ADC_GROUND = 0x0,
118 MAX14577_MUIC_ADC_SEND_END_BUTTON,
119 MAX14577_MUIC_ADC_REMOTE_S1_BUTTON,
120 MAX14577_MUIC_ADC_REMOTE_S2_BUTTON,
121 MAX14577_MUIC_ADC_REMOTE_S3_BUTTON,
122 MAX14577_MUIC_ADC_REMOTE_S4_BUTTON,
123 MAX14577_MUIC_ADC_REMOTE_S5_BUTTON,
124 MAX14577_MUIC_ADC_REMOTE_S6_BUTTON,
125 MAX14577_MUIC_ADC_REMOTE_S7_BUTTON,
126 MAX14577_MUIC_ADC_REMOTE_S8_BUTTON,
127 MAX14577_MUIC_ADC_REMOTE_S9_BUTTON,
128 MAX14577_MUIC_ADC_REMOTE_S10_BUTTON,
129 MAX14577_MUIC_ADC_REMOTE_S11_BUTTON,
130 MAX14577_MUIC_ADC_REMOTE_S12_BUTTON,
131 MAX14577_MUIC_ADC_RESERVED_ACC_1,
132 MAX14577_MUIC_ADC_RESERVED_ACC_2,
133 MAX14577_MUIC_ADC_RESERVED_ACC_3,
134 MAX14577_MUIC_ADC_RESERVED_ACC_4,
135 MAX14577_MUIC_ADC_RESERVED_ACC_5,
136 MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2,
137 MAX14577_MUIC_ADC_PHONE_POWERED_DEV,
138 MAX14577_MUIC_ADC_TTY_CONVERTER,
139 MAX14577_MUIC_ADC_UART_CABLE,
140 MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG,
141 MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF,
142 MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON,
143 MAX14577_MUIC_ADC_AV_CABLE_NOLOAD,
144 MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG,
145 MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF,
146 MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON,
147 MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1, /* with Remote and Simple Ctrl */
148 MAX14577_MUIC_ADC_OPEN,
149 };
150
151 static const unsigned int max14577_extcon_cable[] = {
152 EXTCON_USB,
153 EXTCON_CHG_USB_SDP,
154 EXTCON_CHG_USB_DCP,
155 EXTCON_CHG_USB_FAST,
156 EXTCON_CHG_USB_SLOW,
157 EXTCON_CHG_USB_CDP,
158 EXTCON_JIG,
159 EXTCON_NONE,
160 };
161
162 /*
163 * max14577_muic_set_debounce_time - Set the debounce time of ADC
164 * @info: the instance including private data of max14577 MUIC
165 * @time: the debounce time of ADC
166 */
max14577_muic_set_debounce_time(struct max14577_muic_info * info,enum max14577_muic_adc_debounce_time time)167 static int max14577_muic_set_debounce_time(struct max14577_muic_info *info,
168 enum max14577_muic_adc_debounce_time time)
169 {
170 u8 ret;
171
172 switch (time) {
173 case ADC_DEBOUNCE_TIME_5MS:
174 case ADC_DEBOUNCE_TIME_10MS:
175 case ADC_DEBOUNCE_TIME_25MS:
176 case ADC_DEBOUNCE_TIME_38_62MS:
177 ret = max14577_update_reg(info->max14577->regmap,
178 MAX14577_MUIC_REG_CONTROL3,
179 CTRL3_ADCDBSET_MASK,
180 time << CTRL3_ADCDBSET_SHIFT);
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 * max14577_muic_set_path - Set hardware line according to attached cable
196 * @info: the instance including private data of max14577 MUIC
197 * @value: the path according to attached cable
198 * @attached: the state of cable (true:attached, false:detached)
199 *
200 * The max14577 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 */
max14577_muic_set_path(struct max14577_muic_info * info,u8 val,bool attached)204 static int max14577_muic_set_path(struct max14577_muic_info *info,
205 u8 val, bool attached)
206 {
207 u8 ctrl1, ctrl2 = 0;
208 int ret;
209
210 /* Set open state to path before changing hw path */
211 ret = max14577_update_reg(info->max14577->regmap,
212 MAX14577_MUIC_REG_CONTROL1,
213 CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN);
214 if (ret < 0) {
215 dev_err(info->dev, "failed to update MUIC register\n");
216 return ret;
217 }
218
219 if (attached)
220 ctrl1 = val;
221 else
222 ctrl1 = CTRL1_SW_OPEN;
223
224 ret = max14577_update_reg(info->max14577->regmap,
225 MAX14577_MUIC_REG_CONTROL1,
226 CLEAR_IDBEN_MICEN_MASK, ctrl1);
227 if (ret < 0) {
228 dev_err(info->dev, "failed to update MUIC register\n");
229 return ret;
230 }
231
232 if (attached)
233 ctrl2 |= CTRL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */
234 else
235 ctrl2 |= CTRL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */
236
237 ret = max14577_update_reg(info->max14577->regmap,
238 MAX14577_REG_CONTROL2,
239 CTRL2_LOWPWR_MASK | CTRL2_CPEN_MASK, ctrl2);
240 if (ret < 0) {
241 dev_err(info->dev, "failed to update MUIC register\n");
242 return ret;
243 }
244
245 dev_dbg(info->dev,
246 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
247 ctrl1, ctrl2, attached ? "attached" : "detached");
248
249 return 0;
250 }
251
252 /*
253 * max14577_muic_get_cable_type - Return cable type and check cable state
254 * @info: the instance including private data of max14577 MUIC
255 * @group: the path according to attached cable
256 * @attached: store cable state and return
257 *
258 * This function check the cable state either attached or detached,
259 * and then divide precise type of cable according to cable group.
260 * - max14577_CABLE_GROUP_ADC
261 * - max14577_CABLE_GROUP_CHG
262 */
max14577_muic_get_cable_type(struct max14577_muic_info * info,enum max14577_muic_cable_group group,bool * attached)263 static int max14577_muic_get_cable_type(struct max14577_muic_info *info,
264 enum max14577_muic_cable_group group, bool *attached)
265 {
266 int cable_type = 0;
267 int adc;
268 int chg_type;
269
270 switch (group) {
271 case MAX14577_CABLE_GROUP_ADC:
272 /*
273 * Read ADC value to check cable type and decide cable state
274 * according to cable type
275 */
276 adc = info->status[MAX14577_MUIC_STATUS1] & STATUS1_ADC_MASK;
277 adc >>= STATUS1_ADC_SHIFT;
278
279 /*
280 * Check current cable state/cable type and store cable type
281 * (info->prev_cable_type) for handling cable when cable is
282 * detached.
283 */
284 if (adc == MAX14577_MUIC_ADC_OPEN) {
285 *attached = false;
286
287 cable_type = info->prev_cable_type;
288 info->prev_cable_type = MAX14577_MUIC_ADC_OPEN;
289 } else {
290 *attached = true;
291
292 cable_type = info->prev_cable_type = adc;
293 }
294 break;
295 case MAX14577_CABLE_GROUP_CHG:
296 /*
297 * Read charger type to check cable type and decide cable state
298 * according to type of charger cable.
299 */
300 chg_type = info->status[MAX14577_MUIC_STATUS2] &
301 STATUS2_CHGTYP_MASK;
302 chg_type >>= STATUS2_CHGTYP_SHIFT;
303
304 if (chg_type == MAX14577_CHARGER_TYPE_NONE) {
305 *attached = false;
306
307 cable_type = info->prev_chg_type;
308 info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE;
309 } else {
310 *attached = true;
311
312 /*
313 * Check current cable state/cable type and store cable
314 * type(info->prev_chg_type) for handling cable when
315 * charger cable is detached.
316 */
317 cable_type = info->prev_chg_type = chg_type;
318 }
319
320 break;
321 default:
322 dev_err(info->dev, "Unknown cable group (%d)\n", group);
323 cable_type = -EINVAL;
324 break;
325 }
326
327 return cable_type;
328 }
329
max14577_muic_jig_handler(struct max14577_muic_info * info,int cable_type,bool attached)330 static int max14577_muic_jig_handler(struct max14577_muic_info *info,
331 int cable_type, bool attached)
332 {
333 int ret = 0;
334 u8 path = CTRL1_SW_OPEN;
335
336 dev_dbg(info->dev,
337 "external connector is %s (adc:0x%02x)\n",
338 attached ? "attached" : "detached", cable_type);
339
340 switch (cable_type) {
341 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: /* ADC_JIG_USB_OFF */
342 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: /* ADC_JIG_USB_ON */
343 /* PATH:AP_USB */
344 path = CTRL1_SW_USB;
345 break;
346 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: /* ADC_JIG_UART_OFF */
347 /* PATH:AP_UART */
348 path = CTRL1_SW_UART;
349 break;
350 default:
351 dev_err(info->dev, "failed to detect %s jig cable\n",
352 attached ? "attached" : "detached");
353 return -EINVAL;
354 }
355
356 ret = max14577_muic_set_path(info, path, attached);
357 if (ret < 0)
358 return ret;
359
360 extcon_set_state_sync(info->edev, EXTCON_JIG, attached);
361
362 return 0;
363 }
364
max14577_muic_adc_handler(struct max14577_muic_info * info)365 static int max14577_muic_adc_handler(struct max14577_muic_info *info)
366 {
367 int cable_type;
368 bool attached;
369 int ret = 0;
370
371 /* Check accessory state which is either detached or attached */
372 cable_type = max14577_muic_get_cable_type(info,
373 MAX14577_CABLE_GROUP_ADC, &attached);
374
375 dev_dbg(info->dev,
376 "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
377 attached ? "attached" : "detached", cable_type,
378 info->prev_cable_type);
379
380 switch (cable_type) {
381 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF:
382 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON:
383 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF:
384 /* JIG */
385 ret = max14577_muic_jig_handler(info, cable_type, attached);
386 if (ret < 0)
387 return ret;
388 break;
389 case MAX14577_MUIC_ADC_GROUND:
390 case MAX14577_MUIC_ADC_SEND_END_BUTTON:
391 case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON:
392 case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON:
393 case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON:
394 case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON:
395 case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON:
396 case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON:
397 case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON:
398 case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON:
399 case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON:
400 case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON:
401 case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON:
402 case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON:
403 case MAX14577_MUIC_ADC_RESERVED_ACC_1:
404 case MAX14577_MUIC_ADC_RESERVED_ACC_2:
405 case MAX14577_MUIC_ADC_RESERVED_ACC_3:
406 case MAX14577_MUIC_ADC_RESERVED_ACC_4:
407 case MAX14577_MUIC_ADC_RESERVED_ACC_5:
408 case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2:
409 case MAX14577_MUIC_ADC_PHONE_POWERED_DEV:
410 case MAX14577_MUIC_ADC_TTY_CONVERTER:
411 case MAX14577_MUIC_ADC_UART_CABLE:
412 case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG:
413 case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD:
414 case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG:
415 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON:
416 case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1:
417 /*
418 * This accessory isn't used in general case if it is specially
419 * needed to detect additional accessory, should implement
420 * proper operation when this accessory is attached/detached.
421 */
422 dev_info(info->dev,
423 "accessory is %s but it isn't used (adc:0x%x)\n",
424 attached ? "attached" : "detached", cable_type);
425 return -EAGAIN;
426 default:
427 dev_err(info->dev,
428 "failed to detect %s accessory (adc:0x%x)\n",
429 attached ? "attached" : "detached", cable_type);
430 return -EINVAL;
431 }
432
433 return 0;
434 }
435
max14577_muic_chg_handler(struct max14577_muic_info * info)436 static int max14577_muic_chg_handler(struct max14577_muic_info *info)
437 {
438 int chg_type;
439 bool attached;
440 int ret = 0;
441
442 chg_type = max14577_muic_get_cable_type(info,
443 MAX14577_CABLE_GROUP_CHG, &attached);
444
445 dev_dbg(info->dev,
446 "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
447 attached ? "attached" : "detached",
448 chg_type, info->prev_chg_type);
449
450 switch (chg_type) {
451 case MAX14577_CHARGER_TYPE_USB:
452 /* PATH:AP_USB */
453 ret = max14577_muic_set_path(info, info->path_usb, attached);
454 if (ret < 0)
455 return ret;
456
457 extcon_set_state_sync(info->edev, EXTCON_USB, attached);
458 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
459 attached);
460 break;
461 case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
462 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
463 attached);
464 break;
465 case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
466 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP,
467 attached);
468 break;
469 case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
470 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW,
471 attached);
472 break;
473 case MAX14577_CHARGER_TYPE_SPECIAL_1A:
474 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST,
475 attached);
476 break;
477 case MAX14577_CHARGER_TYPE_NONE:
478 case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
479 break;
480 default:
481 dev_err(info->dev,
482 "failed to detect %s accessory (chg_type:0x%x)\n",
483 attached ? "attached" : "detached", chg_type);
484 return -EINVAL;
485 }
486
487 return 0;
488 }
489
max14577_muic_irq_work(struct work_struct * work)490 static void max14577_muic_irq_work(struct work_struct *work)
491 {
492 struct max14577_muic_info *info = container_of(work,
493 struct max14577_muic_info, irq_work);
494 int ret = 0;
495
496 if (!info->edev)
497 return;
498
499 mutex_lock(&info->mutex);
500
501 ret = max14577_bulk_read(info->max14577->regmap,
502 MAX14577_MUIC_REG_STATUS1, info->status, 2);
503 if (ret) {
504 dev_err(info->dev, "failed to read MUIC register\n");
505 mutex_unlock(&info->mutex);
506 return;
507 }
508
509 if (info->irq_adc) {
510 ret = max14577_muic_adc_handler(info);
511 info->irq_adc = false;
512 }
513 if (info->irq_chg) {
514 ret = max14577_muic_chg_handler(info);
515 info->irq_chg = false;
516 }
517
518 if (ret < 0)
519 dev_err(info->dev, "failed to handle MUIC interrupt\n");
520
521 mutex_unlock(&info->mutex);
522 }
523
524 /*
525 * Sets irq_adc or irq_chg in max14577_muic_info and returns 1.
526 * Returns 0 if irq_type does not match registered IRQ for this device type.
527 */
max14577_parse_irq(struct max14577_muic_info * info,int irq_type)528 static int max14577_parse_irq(struct max14577_muic_info *info, int irq_type)
529 {
530 switch (irq_type) {
531 case MAX14577_IRQ_INT1_ADC:
532 case MAX14577_IRQ_INT1_ADCLOW:
533 case MAX14577_IRQ_INT1_ADCERR:
534 /*
535 * Handle all of accessory except for
536 * type of charger accessory.
537 */
538 info->irq_adc = true;
539 return 1;
540 case MAX14577_IRQ_INT2_CHGTYP:
541 case MAX14577_IRQ_INT2_CHGDETRUN:
542 case MAX14577_IRQ_INT2_DCDTMR:
543 case MAX14577_IRQ_INT2_DBCHG:
544 case MAX14577_IRQ_INT2_VBVOLT:
545 /* Handle charger accessory */
546 info->irq_chg = true;
547 return 1;
548 default:
549 return 0;
550 }
551 }
552
553 /*
554 * Sets irq_adc or irq_chg in max14577_muic_info and returns 1.
555 * Returns 0 if irq_type does not match registered IRQ for this device type.
556 */
max77836_parse_irq(struct max14577_muic_info * info,int irq_type)557 static int max77836_parse_irq(struct max14577_muic_info *info, int irq_type)
558 {
559 /* First check common max14577 interrupts */
560 if (max14577_parse_irq(info, irq_type))
561 return 1;
562
563 switch (irq_type) {
564 case MAX77836_IRQ_INT1_ADC1K:
565 info->irq_adc = true;
566 return 1;
567 case MAX77836_IRQ_INT2_VIDRM:
568 /* Handle charger accessory */
569 info->irq_chg = true;
570 return 1;
571 default:
572 return 0;
573 }
574 }
575
max14577_muic_irq_handler(int irq,void * data)576 static irqreturn_t max14577_muic_irq_handler(int irq, void *data)
577 {
578 struct max14577_muic_info *info = data;
579 int i, irq_type = -1;
580 bool irq_parsed;
581
582 /*
583 * We may be called multiple times for different nested IRQ-s.
584 * Including changes in INT1_ADC and INT2_CGHTYP at once.
585 * However we only need to know whether it was ADC, charger
586 * or both interrupts so decode IRQ and turn on proper flags.
587 */
588 for (i = 0; i < info->muic_irqs_num; i++)
589 if (irq == info->muic_irqs[i].virq)
590 irq_type = info->muic_irqs[i].irq;
591
592 switch (info->max14577->dev_type) {
593 case MAXIM_DEVICE_TYPE_MAX77836:
594 irq_parsed = max77836_parse_irq(info, irq_type);
595 break;
596 case MAXIM_DEVICE_TYPE_MAX14577:
597 default:
598 irq_parsed = max14577_parse_irq(info, irq_type);
599 break;
600 }
601
602 if (!irq_parsed) {
603 dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n",
604 irq_type);
605 return IRQ_HANDLED;
606 }
607 schedule_work(&info->irq_work);
608
609 return IRQ_HANDLED;
610 }
611
max14577_muic_detect_accessory(struct max14577_muic_info * info)612 static int max14577_muic_detect_accessory(struct max14577_muic_info *info)
613 {
614 int ret = 0;
615 int adc;
616 int chg_type;
617 bool attached;
618
619 mutex_lock(&info->mutex);
620
621 /* Read STATUSx register to detect accessory */
622 ret = max14577_bulk_read(info->max14577->regmap,
623 MAX14577_MUIC_REG_STATUS1, info->status, 2);
624 if (ret) {
625 dev_err(info->dev, "failed to read MUIC register\n");
626 mutex_unlock(&info->mutex);
627 return ret;
628 }
629
630 adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC,
631 &attached);
632 if (attached && adc != MAX14577_MUIC_ADC_OPEN) {
633 ret = max14577_muic_adc_handler(info);
634 if (ret < 0) {
635 dev_err(info->dev, "Cannot detect accessory\n");
636 mutex_unlock(&info->mutex);
637 return ret;
638 }
639 }
640
641 chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG,
642 &attached);
643 if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) {
644 ret = max14577_muic_chg_handler(info);
645 if (ret < 0) {
646 dev_err(info->dev, "Cannot detect charger accessory\n");
647 mutex_unlock(&info->mutex);
648 return ret;
649 }
650 }
651
652 mutex_unlock(&info->mutex);
653
654 return 0;
655 }
656
max14577_muic_detect_cable_wq(struct work_struct * work)657 static void max14577_muic_detect_cable_wq(struct work_struct *work)
658 {
659 struct max14577_muic_info *info = container_of(to_delayed_work(work),
660 struct max14577_muic_info, wq_detcable);
661
662 max14577_muic_detect_accessory(info);
663 }
664
max14577_muic_probe(struct platform_device * pdev)665 static int max14577_muic_probe(struct platform_device *pdev)
666 {
667 struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
668 struct max14577_muic_info *info;
669 int delay_jiffies;
670 int ret;
671 int i;
672 u8 id;
673
674 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
675 if (!info)
676 return -ENOMEM;
677
678 info->dev = &pdev->dev;
679 info->max14577 = max14577;
680
681 platform_set_drvdata(pdev, info);
682 mutex_init(&info->mutex);
683
684 INIT_WORK(&info->irq_work, max14577_muic_irq_work);
685
686 switch (max14577->dev_type) {
687 case MAXIM_DEVICE_TYPE_MAX77836:
688 info->muic_irqs = max77836_muic_irqs;
689 info->muic_irqs_num = ARRAY_SIZE(max77836_muic_irqs);
690 break;
691 case MAXIM_DEVICE_TYPE_MAX14577:
692 default:
693 info->muic_irqs = max14577_muic_irqs;
694 info->muic_irqs_num = ARRAY_SIZE(max14577_muic_irqs);
695 }
696
697 /* Support irq domain for max14577 MUIC device */
698 for (i = 0; i < info->muic_irqs_num; i++) {
699 struct max14577_muic_irq *muic_irq = &info->muic_irqs[i];
700 int virq = 0;
701
702 virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq);
703 if (virq <= 0)
704 return -EINVAL;
705 muic_irq->virq = virq;
706
707 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
708 max14577_muic_irq_handler,
709 IRQF_NO_SUSPEND,
710 muic_irq->name, info);
711 if (ret) {
712 dev_err(&pdev->dev,
713 "failed: irq request (IRQ: %d, error :%d)\n",
714 muic_irq->irq, ret);
715 return ret;
716 }
717 }
718
719 /* Initialize extcon device */
720 info->edev = devm_extcon_dev_allocate(&pdev->dev,
721 max14577_extcon_cable);
722 if (IS_ERR(info->edev)) {
723 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
724 return -ENOMEM;
725 }
726
727 ret = devm_extcon_dev_register(&pdev->dev, info->edev);
728 if (ret) {
729 dev_err(&pdev->dev, "failed to register extcon device\n");
730 return ret;
731 }
732
733 /* Default h/w line path */
734 info->path_usb = CTRL1_SW_USB;
735 info->path_uart = CTRL1_SW_UART;
736 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
737
738 /* Set initial path for UART */
739 max14577_muic_set_path(info, info->path_uart, true);
740
741 /* Check revision number of MUIC device*/
742 ret = max14577_read_reg(info->max14577->regmap,
743 MAX14577_REG_DEVICEID, &id);
744 if (ret < 0) {
745 dev_err(&pdev->dev, "failed to read revision number\n");
746 return ret;
747 }
748 dev_info(info->dev, "device ID : 0x%x\n", id);
749
750 /* Set ADC debounce time */
751 max14577_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
752
753 /*
754 * Detect accessory after completing the initialization of platform
755 *
756 * - Use delayed workqueue to detect cable state and then
757 * notify cable state to notifiee/platform through uevent.
758 * After completing the booting of platform, the extcon provider
759 * driver should notify cable state to upper layer.
760 */
761 INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq);
762 queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
763 delay_jiffies);
764
765 return ret;
766 }
767
max14577_muic_remove(struct platform_device * pdev)768 static int max14577_muic_remove(struct platform_device *pdev)
769 {
770 struct max14577_muic_info *info = platform_get_drvdata(pdev);
771
772 cancel_work_sync(&info->irq_work);
773
774 return 0;
775 }
776
777 static const struct platform_device_id max14577_muic_id[] = {
778 { "max14577-muic", MAXIM_DEVICE_TYPE_MAX14577, },
779 { "max77836-muic", MAXIM_DEVICE_TYPE_MAX77836, },
780 { }
781 };
782 MODULE_DEVICE_TABLE(platform, max14577_muic_id);
783
784 static struct platform_driver max14577_muic_driver = {
785 .driver = {
786 .name = "max14577-muic",
787 },
788 .probe = max14577_muic_probe,
789 .remove = max14577_muic_remove,
790 .id_table = max14577_muic_id,
791 };
792
793 module_platform_driver(max14577_muic_driver);
794
795 MODULE_DESCRIPTION("Maxim 14577/77836 Extcon driver");
796 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <krzk@kernel.org>");
797 MODULE_LICENSE("GPL");
798 MODULE_ALIAS("platform:extcon-max14577");
799
