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1// SPDX-License-Identifier: GPL-2.0+
2//
3// extcon-max14577.c - MAX14577/77836 extcon driver to support MUIC
4//
5// Copyright (C) 2013,2014 Samsung Electronics
6// Chanwoo Choi <cw00.choi@samsung.com>
7// Krzysztof Kozlowski <krzk@kernel.org>
8
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/i2c.h>
12#include <linux/interrupt.h>
13#include <linux/platform_device.h>
14#include <linux/mfd/max14577.h>
15#include <linux/mfd/max14577-private.h>
16#include <linux/extcon-provider.h>
17
18#define DELAY_MS_DEFAULT 17000 /* unit: millisecond */
19
20enum max14577_muic_adc_debounce_time {
21 ADC_DEBOUNCE_TIME_5MS = 0,
22 ADC_DEBOUNCE_TIME_10MS,
23 ADC_DEBOUNCE_TIME_25MS,
24 ADC_DEBOUNCE_TIME_38_62MS,
25};
26
27enum max14577_muic_status {
28 MAX14577_MUIC_STATUS1 = 0,
29 MAX14577_MUIC_STATUS2 = 1,
30 MAX14577_MUIC_STATUS_END,
31};
32
33/**
34 * struct max14577_muic_irq
35 * @irq: the index of irq list of MUIC device.
36 * @name: the name of irq.
37 * @virq: the virtual irq to use irq domain
38 */
39struct max14577_muic_irq {
40 unsigned int irq;
41 const char *name;
42 unsigned int virq;
43};
44
45static struct max14577_muic_irq max14577_muic_irqs[] = {
46 { MAX14577_IRQ_INT1_ADC, "muic-ADC" },
47 { MAX14577_IRQ_INT1_ADCLOW, "muic-ADCLOW" },
48 { MAX14577_IRQ_INT1_ADCERR, "muic-ADCError" },
49 { MAX14577_IRQ_INT2_CHGTYP, "muic-CHGTYP" },
50 { MAX14577_IRQ_INT2_CHGDETRUN, "muic-CHGDETRUN" },
51 { MAX14577_IRQ_INT2_DCDTMR, "muic-DCDTMR" },
52 { MAX14577_IRQ_INT2_DBCHG, "muic-DBCHG" },
53 { MAX14577_IRQ_INT2_VBVOLT, "muic-VBVOLT" },
54};
55
56static struct max14577_muic_irq max77836_muic_irqs[] = {
57 { MAX14577_IRQ_INT1_ADC, "muic-ADC" },
58 { MAX14577_IRQ_INT1_ADCLOW, "muic-ADCLOW" },
59 { MAX14577_IRQ_INT1_ADCERR, "muic-ADCError" },
60 { MAX77836_IRQ_INT1_ADC1K, "muic-ADC1K" },
61 { MAX14577_IRQ_INT2_CHGTYP, "muic-CHGTYP" },
62 { MAX14577_IRQ_INT2_CHGDETRUN, "muic-CHGDETRUN" },
63 { MAX14577_IRQ_INT2_DCDTMR, "muic-DCDTMR" },
64 { MAX14577_IRQ_INT2_DBCHG, "muic-DBCHG" },
65 { MAX14577_IRQ_INT2_VBVOLT, "muic-VBVOLT" },
66 { MAX77836_IRQ_INT2_VIDRM, "muic-VIDRM" },
67};
68
69struct max14577_muic_info {
70 struct device *dev;
71 struct max14577 *max14577;
72 struct extcon_dev *edev;
73 int prev_cable_type;
74 int prev_chg_type;
75 u8 status[MAX14577_MUIC_STATUS_END];
76
77 struct max14577_muic_irq *muic_irqs;
78 unsigned int muic_irqs_num;
79 bool irq_adc;
80 bool irq_chg;
81 struct work_struct irq_work;
82 struct mutex mutex;
83
84 /*
85 * Use delayed workqueue to detect cable state and then
86 * notify cable state to notifiee/platform through uevent.
87 * After completing the booting of platform, the extcon provider
88 * driver should notify cable state to upper layer.
89 */
90 struct delayed_work wq_detcable;
91
92 /*
93 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
94 * h/w path of COMP2/COMN1 on CONTROL1 register.
95 */
96 int path_usb;
97 int path_uart;
98};
99
100enum max14577_muic_cable_group {
101 MAX14577_CABLE_GROUP_ADC = 0,
102 MAX14577_CABLE_GROUP_CHG,
103};
104
105/* Define supported accessory type */
106enum max14577_muic_acc_type {
107 MAX14577_MUIC_ADC_GROUND = 0x0,
108 MAX14577_MUIC_ADC_SEND_END_BUTTON,
109 MAX14577_MUIC_ADC_REMOTE_S1_BUTTON,
110 MAX14577_MUIC_ADC_REMOTE_S2_BUTTON,
111 MAX14577_MUIC_ADC_REMOTE_S3_BUTTON,
112 MAX14577_MUIC_ADC_REMOTE_S4_BUTTON,
113 MAX14577_MUIC_ADC_REMOTE_S5_BUTTON,
114 MAX14577_MUIC_ADC_REMOTE_S6_BUTTON,
115 MAX14577_MUIC_ADC_REMOTE_S7_BUTTON,
116 MAX14577_MUIC_ADC_REMOTE_S8_BUTTON,
117 MAX14577_MUIC_ADC_REMOTE_S9_BUTTON,
118 MAX14577_MUIC_ADC_REMOTE_S10_BUTTON,
119 MAX14577_MUIC_ADC_REMOTE_S11_BUTTON,
120 MAX14577_MUIC_ADC_REMOTE_S12_BUTTON,
121 MAX14577_MUIC_ADC_RESERVED_ACC_1,
122 MAX14577_MUIC_ADC_RESERVED_ACC_2,
123 MAX14577_MUIC_ADC_RESERVED_ACC_3,
124 MAX14577_MUIC_ADC_RESERVED_ACC_4,
125 MAX14577_MUIC_ADC_RESERVED_ACC_5,
126 MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2,
127 MAX14577_MUIC_ADC_PHONE_POWERED_DEV,
128 MAX14577_MUIC_ADC_TTY_CONVERTER,
129 MAX14577_MUIC_ADC_UART_CABLE,
130 MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG,
131 MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF,
132 MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON,
133 MAX14577_MUIC_ADC_AV_CABLE_NOLOAD,
134 MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG,
135 MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF,
136 MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON,
137 MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1, /* with Remote and Simple Ctrl */
138 MAX14577_MUIC_ADC_OPEN,
139};
140
141static const unsigned int max14577_extcon_cable[] = {
142 EXTCON_USB,
143 EXTCON_CHG_USB_SDP,
144 EXTCON_CHG_USB_DCP,
145 EXTCON_CHG_USB_FAST,
146 EXTCON_CHG_USB_SLOW,
147 EXTCON_CHG_USB_CDP,
148 EXTCON_JIG,
149 EXTCON_NONE,
150};
151
152/*
153 * max14577_muic_set_debounce_time - Set the debounce time of ADC
154 * @info: the instance including private data of max14577 MUIC
155 * @time: the debounce time of ADC
156 */
157static int max14577_muic_set_debounce_time(struct max14577_muic_info *info,
158 enum max14577_muic_adc_debounce_time time)
159{
160 u8 ret;
161
162 switch (time) {
163 case ADC_DEBOUNCE_TIME_5MS:
164 case ADC_DEBOUNCE_TIME_10MS:
165 case ADC_DEBOUNCE_TIME_25MS:
166 case ADC_DEBOUNCE_TIME_38_62MS:
167 ret = max14577_update_reg(info->max14577->regmap,
168 MAX14577_MUIC_REG_CONTROL3,
169 CTRL3_ADCDBSET_MASK,
170 time << CTRL3_ADCDBSET_SHIFT);
171 if (ret) {
172 dev_err(info->dev, "failed to set ADC debounce time\n");
173 return ret;
174 }
175 break;
176 default:
177 dev_err(info->dev, "invalid ADC debounce time\n");
178 return -EINVAL;
179 }
180
181 return 0;
182};
183
184/*
185 * max14577_muic_set_path - Set hardware line according to attached cable
186 * @info: the instance including private data of max14577 MUIC
187 * @value: the path according to attached cable
188 * @attached: the state of cable (true:attached, false:detached)
189 *
190 * The max14577 MUIC device share outside H/W line among a varity of cables
191 * so, this function set internal path of H/W line according to the type of
192 * attached cable.
193 */
194static int max14577_muic_set_path(struct max14577_muic_info *info,
195 u8 val, bool attached)
196{
197 u8 ctrl1, ctrl2 = 0;
198 int ret;
199
200 /* Set open state to path before changing hw path */
201 ret = max14577_update_reg(info->max14577->regmap,
202 MAX14577_MUIC_REG_CONTROL1,
203 CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN);
204 if (ret < 0) {
205 dev_err(info->dev, "failed to update MUIC register\n");
206 return ret;
207 }
208
209 if (attached)
210 ctrl1 = val;
211 else
212 ctrl1 = CTRL1_SW_OPEN;
213
214 ret = max14577_update_reg(info->max14577->regmap,
215 MAX14577_MUIC_REG_CONTROL1,
216 CLEAR_IDBEN_MICEN_MASK, ctrl1);
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 |= CTRL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */
224 else
225 ctrl2 |= CTRL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */
226
227 ret = max14577_update_reg(info->max14577->regmap,
228 MAX14577_REG_CONTROL2,
229 CTRL2_LOWPWR_MASK | CTRL2_CPEN_MASK, ctrl2);
230 if (ret < 0) {
231 dev_err(info->dev, "failed to update MUIC register\n");
232 return ret;
233 }
234
235 dev_dbg(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 * max14577_muic_get_cable_type - Return cable type and check cable state
244 * @info: the instance including private data of max14577 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 * - max14577_CABLE_GROUP_ADC
251 * - max14577_CABLE_GROUP_CHG
252 */
253static int max14577_muic_get_cable_type(struct max14577_muic_info *info,
254 enum max14577_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 MAX14577_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[MAX14577_MUIC_STATUS1] & 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 == MAX14577_MUIC_ADC_OPEN) {
275 *attached = false;
276
277 cable_type = info->prev_cable_type;
278 info->prev_cable_type = MAX14577_MUIC_ADC_OPEN;
279 } else {
280 *attached = true;
281
282 cable_type = info->prev_cable_type = adc;
283 }
284 break;
285 case MAX14577_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[MAX14577_MUIC_STATUS2] &
291 STATUS2_CHGTYP_MASK;
292 chg_type >>= STATUS2_CHGTYP_SHIFT;
293
294 if (chg_type == MAX14577_CHARGER_TYPE_NONE) {
295 *attached = false;
296
297 cable_type = info->prev_chg_type;
298 info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE;
299 } else {
300 *attached = true;
301
302 /*
303 * Check current cable state/cable type and store cable
304 * type(info->prev_chg_type) for handling cable when
305 * charger cable is detached.
306 */
307 cable_type = info->prev_chg_type = chg_type;
308 }
309
310 break;
311 default:
312 dev_err(info->dev, "Unknown cable group (%d)\n", group);
313 cable_type = -EINVAL;
314 break;
315 }
316
317 return cable_type;
318}
319
320static int max14577_muic_jig_handler(struct max14577_muic_info *info,
321 int cable_type, bool attached)
322{
323 int ret = 0;
324 u8 path = CTRL1_SW_OPEN;
325
326 dev_dbg(info->dev,
327 "external connector is %s (adc:0x%02x)\n",
328 attached ? "attached" : "detached", cable_type);
329
330 switch (cable_type) {
331 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: /* ADC_JIG_USB_OFF */
332 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: /* ADC_JIG_USB_ON */
333 /* PATH:AP_USB */
334 path = CTRL1_SW_USB;
335 break;
336 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: /* ADC_JIG_UART_OFF */
337 /* PATH:AP_UART */
338 path = CTRL1_SW_UART;
339 break;
340 default:
341 dev_err(info->dev, "failed to detect %s jig cable\n",
342 attached ? "attached" : "detached");
343 return -EINVAL;
344 }
345
346 ret = max14577_muic_set_path(info, path, attached);
347 if (ret < 0)
348 return ret;
349
350 extcon_set_state_sync(info->edev, EXTCON_JIG, attached);
351
352 return 0;
353}
354
355static int max14577_muic_adc_handler(struct max14577_muic_info *info)
356{
357 int cable_type;
358 bool attached;
359 int ret = 0;
360
361 /* Check accessory state which is either detached or attached */
362 cable_type = max14577_muic_get_cable_type(info,
363 MAX14577_CABLE_GROUP_ADC, &attached);
364
365 dev_dbg(info->dev,
366 "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
367 attached ? "attached" : "detached", cable_type,
368 info->prev_cable_type);
369
370 switch (cable_type) {
371 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF:
372 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON:
373 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF:
374 /* JIG */
375 ret = max14577_muic_jig_handler(info, cable_type, attached);
376 if (ret < 0)
377 return ret;
378 break;
379 case MAX14577_MUIC_ADC_GROUND:
380 case MAX14577_MUIC_ADC_SEND_END_BUTTON:
381 case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON:
382 case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON:
383 case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON:
384 case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON:
385 case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON:
386 case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON:
387 case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON:
388 case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON:
389 case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON:
390 case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON:
391 case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON:
392 case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON:
393 case MAX14577_MUIC_ADC_RESERVED_ACC_1:
394 case MAX14577_MUIC_ADC_RESERVED_ACC_2:
395 case MAX14577_MUIC_ADC_RESERVED_ACC_3:
396 case MAX14577_MUIC_ADC_RESERVED_ACC_4:
397 case MAX14577_MUIC_ADC_RESERVED_ACC_5:
398 case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2:
399 case MAX14577_MUIC_ADC_PHONE_POWERED_DEV:
400 case MAX14577_MUIC_ADC_TTY_CONVERTER:
401 case MAX14577_MUIC_ADC_UART_CABLE:
402 case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG:
403 case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD:
404 case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG:
405 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON:
406 case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1:
407 /*
408 * This accessory isn't used in general case if it is specially
409 * needed to detect additional accessory, should implement
410 * proper operation when this accessory is attached/detached.
411 */
412 dev_info(info->dev,
413 "accessory is %s but it isn't used (adc:0x%x)\n",
414 attached ? "attached" : "detached", cable_type);
415 return -EAGAIN;
416 default:
417 dev_err(info->dev,
418 "failed to detect %s accessory (adc:0x%x)\n",
419 attached ? "attached" : "detached", cable_type);
420 return -EINVAL;
421 }
422
423 return 0;
424}
425
426static int max14577_muic_chg_handler(struct max14577_muic_info *info)
427{
428 int chg_type;
429 bool attached;
430 int ret = 0;
431
432 chg_type = max14577_muic_get_cable_type(info,
433 MAX14577_CABLE_GROUP_CHG, &attached);
434
435 dev_dbg(info->dev,
436 "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
437 attached ? "attached" : "detached",
438 chg_type, info->prev_chg_type);
439
440 switch (chg_type) {
441 case MAX14577_CHARGER_TYPE_USB:
442 /* PATH:AP_USB */
443 ret = max14577_muic_set_path(info, info->path_usb, attached);
444 if (ret < 0)
445 return ret;
446
447 extcon_set_state_sync(info->edev, EXTCON_USB, attached);
448 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
449 attached);
450 break;
451 case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
452 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
453 attached);
454 break;
455 case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
456 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP,
457 attached);
458 break;
459 case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
460 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW,
461 attached);
462 break;
463 case MAX14577_CHARGER_TYPE_SPECIAL_1A:
464 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST,
465 attached);
466 break;
467 case MAX14577_CHARGER_TYPE_NONE:
468 case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
469 break;
470 default:
471 dev_err(info->dev,
472 "failed to detect %s accessory (chg_type:0x%x)\n",
473 attached ? "attached" : "detached", chg_type);
474 return -EINVAL;
475 }
476
477 return 0;
478}
479
480static void max14577_muic_irq_work(struct work_struct *work)
481{
482 struct max14577_muic_info *info = container_of(work,
483 struct max14577_muic_info, irq_work);
484 int ret = 0;
485
486 if (!info->edev)
487 return;
488
489 mutex_lock(&info->mutex);
490
491 ret = max14577_bulk_read(info->max14577->regmap,
492 MAX14577_MUIC_REG_STATUS1, info->status, 2);
493 if (ret) {
494 dev_err(info->dev, "failed to read MUIC register\n");
495 mutex_unlock(&info->mutex);
496 return;
497 }
498
499 if (info->irq_adc) {
500 ret = max14577_muic_adc_handler(info);
501 info->irq_adc = false;
502 }
503 if (info->irq_chg) {
504 ret = max14577_muic_chg_handler(info);
505 info->irq_chg = false;
506 }
507
508 if (ret < 0)
509 dev_err(info->dev, "failed to handle MUIC interrupt\n");
510
511 mutex_unlock(&info->mutex);
512}
513
514/*
515 * Sets irq_adc or irq_chg in max14577_muic_info and returns 1.
516 * Returns 0 if irq_type does not match registered IRQ for this device type.
517 */
518static int max14577_parse_irq(struct max14577_muic_info *info, int irq_type)
519{
520 switch (irq_type) {
521 case MAX14577_IRQ_INT1_ADC:
522 case MAX14577_IRQ_INT1_ADCLOW:
523 case MAX14577_IRQ_INT1_ADCERR:
524 /*
525 * Handle all of accessory except for
526 * type of charger accessory.
527 */
528 info->irq_adc = true;
529 return 1;
530 case MAX14577_IRQ_INT2_CHGTYP:
531 case MAX14577_IRQ_INT2_CHGDETRUN:
532 case MAX14577_IRQ_INT2_DCDTMR:
533 case MAX14577_IRQ_INT2_DBCHG:
534 case MAX14577_IRQ_INT2_VBVOLT:
535 /* Handle charger accessory */
536 info->irq_chg = true;
537 return 1;
538 default:
539 return 0;
540 }
541}
542
543/*
544 * Sets irq_adc or irq_chg in max14577_muic_info and returns 1.
545 * Returns 0 if irq_type does not match registered IRQ for this device type.
546 */
547static int max77836_parse_irq(struct max14577_muic_info *info, int irq_type)
548{
549 /* First check common max14577 interrupts */
550 if (max14577_parse_irq(info, irq_type))
551 return 1;
552
553 switch (irq_type) {
554 case MAX77836_IRQ_INT1_ADC1K:
555 info->irq_adc = true;
556 return 1;
557 case MAX77836_IRQ_INT2_VIDRM:
558 /* Handle charger accessory */
559 info->irq_chg = true;
560 return 1;
561 default:
562 return 0;
563 }
564}
565
566static irqreturn_t max14577_muic_irq_handler(int irq, void *data)
567{
568 struct max14577_muic_info *info = data;
569 int i, irq_type = -1;
570 bool irq_parsed;
571
572 /*
573 * We may be called multiple times for different nested IRQ-s.
574 * Including changes in INT1_ADC and INT2_CGHTYP at once.
575 * However we only need to know whether it was ADC, charger
576 * or both interrupts so decode IRQ and turn on proper flags.
577 */
578 for (i = 0; i < info->muic_irqs_num; i++)
579 if (irq == info->muic_irqs[i].virq)
580 irq_type = info->muic_irqs[i].irq;
581
582 switch (info->max14577->dev_type) {
583 case MAXIM_DEVICE_TYPE_MAX77836:
584 irq_parsed = max77836_parse_irq(info, irq_type);
585 break;
586 case MAXIM_DEVICE_TYPE_MAX14577:
587 default:
588 irq_parsed = max14577_parse_irq(info, irq_type);
589 break;
590 }
591
592 if (!irq_parsed) {
593 dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n",
594 irq_type);
595 return IRQ_HANDLED;
596 }
597 schedule_work(&info->irq_work);
598
599 return IRQ_HANDLED;
600}
601
602static int max14577_muic_detect_accessory(struct max14577_muic_info *info)
603{
604 int ret = 0;
605 int adc;
606 int chg_type;
607 bool attached;
608
609 mutex_lock(&info->mutex);
610
611 /* Read STATUSx register to detect accessory */
612 ret = max14577_bulk_read(info->max14577->regmap,
613 MAX14577_MUIC_REG_STATUS1, info->status, 2);
614 if (ret) {
615 dev_err(info->dev, "failed to read MUIC register\n");
616 mutex_unlock(&info->mutex);
617 return ret;
618 }
619
620 adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC,
621 &attached);
622 if (attached && adc != MAX14577_MUIC_ADC_OPEN) {
623 ret = max14577_muic_adc_handler(info);
624 if (ret < 0) {
625 dev_err(info->dev, "Cannot detect accessory\n");
626 mutex_unlock(&info->mutex);
627 return ret;
628 }
629 }
630
631 chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG,
632 &attached);
633 if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) {
634 ret = max14577_muic_chg_handler(info);
635 if (ret < 0) {
636 dev_err(info->dev, "Cannot detect charger accessory\n");
637 mutex_unlock(&info->mutex);
638 return ret;
639 }
640 }
641
642 mutex_unlock(&info->mutex);
643
644 return 0;
645}
646
647static void max14577_muic_detect_cable_wq(struct work_struct *work)
648{
649 struct max14577_muic_info *info = container_of(to_delayed_work(work),
650 struct max14577_muic_info, wq_detcable);
651
652 max14577_muic_detect_accessory(info);
653}
654
655static int max14577_muic_probe(struct platform_device *pdev)
656{
657 struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
658 struct max14577_muic_info *info;
659 int delay_jiffies;
660 int cable_type;
661 bool attached;
662 int ret;
663 int i;
664 u8 id;
665
666 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
667 if (!info)
668 return -ENOMEM;
669
670 info->dev = &pdev->dev;
671 info->max14577 = max14577;
672
673 platform_set_drvdata(pdev, info);
674 mutex_init(&info->mutex);
675
676 INIT_WORK(&info->irq_work, max14577_muic_irq_work);
677
678 switch (max14577->dev_type) {
679 case MAXIM_DEVICE_TYPE_MAX77836:
680 info->muic_irqs = max77836_muic_irqs;
681 info->muic_irqs_num = ARRAY_SIZE(max77836_muic_irqs);
682 break;
683 case MAXIM_DEVICE_TYPE_MAX14577:
684 default:
685 info->muic_irqs = max14577_muic_irqs;
686 info->muic_irqs_num = ARRAY_SIZE(max14577_muic_irqs);
687 }
688
689 /* Support irq domain for max14577 MUIC device */
690 for (i = 0; i < info->muic_irqs_num; i++) {
691 struct max14577_muic_irq *muic_irq = &info->muic_irqs[i];
692 int virq = 0;
693
694 virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq);
695 if (virq <= 0)
696 return -EINVAL;
697 muic_irq->virq = virq;
698
699 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
700 max14577_muic_irq_handler,
701 IRQF_NO_SUSPEND,
702 muic_irq->name, info);
703 if (ret) {
704 dev_err(&pdev->dev,
705 "failed: irq request (IRQ: %d, error :%d)\n",
706 muic_irq->irq, ret);
707 return ret;
708 }
709 }
710
711 /* Initialize extcon device */
712 info->edev = devm_extcon_dev_allocate(&pdev->dev,
713 max14577_extcon_cable);
714 if (IS_ERR(info->edev)) {
715 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
716 return -ENOMEM;
717 }
718
719 ret = devm_extcon_dev_register(&pdev->dev, info->edev);
720 if (ret) {
721 dev_err(&pdev->dev, "failed to register extcon device\n");
722 return ret;
723 }
724
725 /* Default h/w line path */
726 info->path_usb = CTRL1_SW_USB;
727 info->path_uart = CTRL1_SW_UART;
728 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
729
730 /* Set initial path for UART when JIG is connected to get serial logs */
731 ret = max14577_bulk_read(info->max14577->regmap,
732 MAX14577_MUIC_REG_STATUS1, info->status, 2);
733 if (ret) {
734 dev_err(info->dev, "Cannot read STATUS registers\n");
735 return ret;
736 }
737 cable_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC,
738 &attached);
739 if (attached && cable_type == MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF)
740 max14577_muic_set_path(info, info->path_uart, true);
741
742 /* Check revision number of MUIC device*/
743 ret = max14577_read_reg(info->max14577->regmap,
744 MAX14577_REG_DEVICEID, &id);
745 if (ret < 0) {
746 dev_err(&pdev->dev, "failed to read revision number\n");
747 return ret;
748 }
749 dev_info(info->dev, "device ID : 0x%x\n", id);
750
751 /* Set ADC debounce time */
752 max14577_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
753
754 /*
755 * Detect accessory after completing the initialization of platform
756 *
757 * - Use delayed workqueue to detect cable state and then
758 * notify cable state to notifiee/platform through uevent.
759 * After completing the booting of platform, the extcon provider
760 * driver should notify cable state to upper layer.
761 */
762 INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq);
763 queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
764 delay_jiffies);
765
766 return ret;
767}
768
769static int max14577_muic_remove(struct platform_device *pdev)
770{
771 struct max14577_muic_info *info = platform_get_drvdata(pdev);
772
773 cancel_work_sync(&info->irq_work);
774
775 return 0;
776}
777
778static const struct platform_device_id max14577_muic_id[] = {
779 { "max14577-muic", MAXIM_DEVICE_TYPE_MAX14577, },
780 { "max77836-muic", MAXIM_DEVICE_TYPE_MAX77836, },
781 { }
782};
783MODULE_DEVICE_TABLE(platform, max14577_muic_id);
784
785static const struct of_device_id of_max14577_muic_dt_match[] = {
786 { .compatible = "maxim,max14577-muic",
787 .data = (void *)MAXIM_DEVICE_TYPE_MAX14577, },
788 { .compatible = "maxim,max77836-muic",
789 .data = (void *)MAXIM_DEVICE_TYPE_MAX77836, },
790 { },
791};
792MODULE_DEVICE_TABLE(of, of_max14577_muic_dt_match);
793
794static struct platform_driver max14577_muic_driver = {
795 .driver = {
796 .name = "max14577-muic",
797 .of_match_table = of_max14577_muic_dt_match,
798 },
799 .probe = max14577_muic_probe,
800 .remove = max14577_muic_remove,
801 .id_table = max14577_muic_id,
802};
803
804module_platform_driver(max14577_muic_driver);
805
806MODULE_DESCRIPTION("Maxim 14577/77836 Extcon driver");
807MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <krzk@kernel.org>");
808MODULE_LICENSE("GPL");
809MODULE_ALIAS("platform:extcon-max14577");
1/*
2 * extcon-max14577.c - MAX14577 extcon driver to support MAX14577 MUIC
3 *
4 * Copyright (C) 2013 Samsung Electrnoics
5 * Chanwoo Choi <cw00.choi@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/interrupt.h>
22#include <linux/platform_device.h>
23#include <linux/mfd/max14577.h>
24#include <linux/mfd/max14577-private.h>
25#include <linux/extcon.h>
26
27#define DEV_NAME "max14577-muic"
28#define DELAY_MS_DEFAULT 17000 /* unit: millisecond */
29
30enum 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
37enum max14577_muic_status {
38 MAX14577_MUIC_STATUS1 = 0,
39 MAX14577_MUIC_STATUS2 = 1,
40 MAX14577_MUIC_STATUS_END,
41};
42
43struct max14577_muic_info {
44 struct device *dev;
45 struct max14577 *max14577;
46 struct extcon_dev *edev;
47 int prev_cable_type;
48 int prev_chg_type;
49 u8 status[MAX14577_MUIC_STATUS_END];
50
51 bool irq_adc;
52 bool irq_chg;
53 struct work_struct irq_work;
54 struct mutex mutex;
55
56 /*
57 * Use delayed workqueue to detect cable state and then
58 * notify cable state to notifiee/platform through uevent.
59 * After completing the booting of platform, the extcon provider
60 * driver should notify cable state to upper layer.
61 */
62 struct delayed_work wq_detcable;
63
64 /*
65 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
66 * h/w path of COMP2/COMN1 on CONTROL1 register.
67 */
68 int path_usb;
69 int path_uart;
70};
71
72enum max14577_muic_cable_group {
73 MAX14577_CABLE_GROUP_ADC = 0,
74 MAX14577_CABLE_GROUP_CHG,
75};
76
77/**
78 * struct max14577_muic_irq
79 * @irq: the index of irq list of MUIC device.
80 * @name: the name of irq.
81 * @virq: the virtual irq to use irq domain
82 */
83struct max14577_muic_irq {
84 unsigned int irq;
85 const char *name;
86 unsigned int virq;
87};
88
89static struct max14577_muic_irq muic_irqs[] = {
90 { MAX14577_IRQ_INT1_ADC, "muic-ADC" },
91 { MAX14577_IRQ_INT1_ADCLOW, "muic-ADCLOW" },
92 { MAX14577_IRQ_INT1_ADCERR, "muic-ADCError" },
93 { MAX14577_IRQ_INT2_CHGTYP, "muic-CHGTYP" },
94 { MAX14577_IRQ_INT2_CHGDETRUN, "muic-CHGDETRUN" },
95 { MAX14577_IRQ_INT2_DCDTMR, "muic-DCDTMR" },
96 { MAX14577_IRQ_INT2_DBCHG, "muic-DBCHG" },
97 { MAX14577_IRQ_INT2_VBVOLT, "muic-VBVOLT" },
98};
99
100/* Define supported accessory type */
101enum max14577_muic_acc_type {
102 MAX14577_MUIC_ADC_GROUND = 0x0,
103 MAX14577_MUIC_ADC_SEND_END_BUTTON,
104 MAX14577_MUIC_ADC_REMOTE_S1_BUTTON,
105 MAX14577_MUIC_ADC_REMOTE_S2_BUTTON,
106 MAX14577_MUIC_ADC_REMOTE_S3_BUTTON,
107 MAX14577_MUIC_ADC_REMOTE_S4_BUTTON,
108 MAX14577_MUIC_ADC_REMOTE_S5_BUTTON,
109 MAX14577_MUIC_ADC_REMOTE_S6_BUTTON,
110 MAX14577_MUIC_ADC_REMOTE_S7_BUTTON,
111 MAX14577_MUIC_ADC_REMOTE_S8_BUTTON,
112 MAX14577_MUIC_ADC_REMOTE_S9_BUTTON,
113 MAX14577_MUIC_ADC_REMOTE_S10_BUTTON,
114 MAX14577_MUIC_ADC_REMOTE_S11_BUTTON,
115 MAX14577_MUIC_ADC_REMOTE_S12_BUTTON,
116 MAX14577_MUIC_ADC_RESERVED_ACC_1,
117 MAX14577_MUIC_ADC_RESERVED_ACC_2,
118 MAX14577_MUIC_ADC_RESERVED_ACC_3,
119 MAX14577_MUIC_ADC_RESERVED_ACC_4,
120 MAX14577_MUIC_ADC_RESERVED_ACC_5,
121 MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2,
122 MAX14577_MUIC_ADC_PHONE_POWERED_DEV,
123 MAX14577_MUIC_ADC_TTY_CONVERTER,
124 MAX14577_MUIC_ADC_UART_CABLE,
125 MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG,
126 MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF,
127 MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON,
128 MAX14577_MUIC_ADC_AV_CABLE_NOLOAD,
129 MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG,
130 MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF,
131 MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON,
132 MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1, /* with Remote and Simple Ctrl */
133 MAX14577_MUIC_ADC_OPEN,
134};
135
136/* max14577 MUIC device support below list of accessories(external connector) */
137enum {
138 EXTCON_CABLE_USB = 0,
139 EXTCON_CABLE_TA,
140 EXTCON_CABLE_FAST_CHARGER,
141 EXTCON_CABLE_SLOW_CHARGER,
142 EXTCON_CABLE_CHARGE_DOWNSTREAM,
143 EXTCON_CABLE_JIG_USB_ON,
144 EXTCON_CABLE_JIG_USB_OFF,
145 EXTCON_CABLE_JIG_UART_OFF,
146 EXTCON_CABLE_JIG_UART_ON,
147
148 _EXTCON_CABLE_NUM,
149};
150
151static const char *max14577_extcon_cable[] = {
152 [EXTCON_CABLE_USB] = "USB",
153 [EXTCON_CABLE_TA] = "TA",
154 [EXTCON_CABLE_FAST_CHARGER] = "Fast-charger",
155 [EXTCON_CABLE_SLOW_CHARGER] = "Slow-charger",
156 [EXTCON_CABLE_CHARGE_DOWNSTREAM] = "Charge-downstream",
157 [EXTCON_CABLE_JIG_USB_ON] = "JIG-USB-ON",
158 [EXTCON_CABLE_JIG_USB_OFF] = "JIG-USB-OFF",
159 [EXTCON_CABLE_JIG_UART_OFF] = "JIG-UART-OFF",
160 [EXTCON_CABLE_JIG_UART_ON] = "JIG-UART-ON",
161
162 NULL,
163};
164
165/*
166 * max14577_muic_set_debounce_time - Set the debounce time of ADC
167 * @info: the instance including private data of max14577 MUIC
168 * @time: the debounce time of ADC
169 */
170static int max14577_muic_set_debounce_time(struct max14577_muic_info *info,
171 enum max14577_muic_adc_debounce_time time)
172{
173 u8 ret;
174
175 switch (time) {
176 case ADC_DEBOUNCE_TIME_5MS:
177 case ADC_DEBOUNCE_TIME_10MS:
178 case ADC_DEBOUNCE_TIME_25MS:
179 case ADC_DEBOUNCE_TIME_38_62MS:
180 ret = max14577_update_reg(info->max14577->regmap,
181 MAX14577_MUIC_REG_CONTROL3,
182 CTRL3_ADCDBSET_MASK,
183 time << CTRL3_ADCDBSET_SHIFT);
184 if (ret) {
185 dev_err(info->dev, "failed to set ADC debounce time\n");
186 return ret;
187 }
188 break;
189 default:
190 dev_err(info->dev, "invalid ADC debounce time\n");
191 return -EINVAL;
192 }
193
194 return 0;
195};
196
197/*
198 * max14577_muic_set_path - Set hardware line according to attached cable
199 * @info: the instance including private data of max14577 MUIC
200 * @value: the path according to attached cable
201 * @attached: the state of cable (true:attached, false:detached)
202 *
203 * The max14577 MUIC device share outside H/W line among a varity of cables
204 * so, this function set internal path of H/W line according to the type of
205 * attached cable.
206 */
207static int max14577_muic_set_path(struct max14577_muic_info *info,
208 u8 val, bool attached)
209{
210 int ret = 0;
211 u8 ctrl1, ctrl2 = 0;
212
213 /* Set open state to path before changing hw path */
214 ret = max14577_update_reg(info->max14577->regmap,
215 MAX14577_MUIC_REG_CONTROL1,
216 CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN);
217 if (ret < 0) {
218 dev_err(info->dev, "failed to update MUIC register\n");
219 return ret;
220 }
221
222 if (attached)
223 ctrl1 = val;
224 else
225 ctrl1 = CTRL1_SW_OPEN;
226
227 ret = max14577_update_reg(info->max14577->regmap,
228 MAX14577_MUIC_REG_CONTROL1,
229 CLEAR_IDBEN_MICEN_MASK, ctrl1);
230 if (ret < 0) {
231 dev_err(info->dev, "failed to update MUIC register\n");
232 return ret;
233 }
234
235 if (attached)
236 ctrl2 |= CTRL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */
237 else
238 ctrl2 |= CTRL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */
239
240 ret = max14577_update_reg(info->max14577->regmap,
241 MAX14577_REG_CONTROL2,
242 CTRL2_LOWPWR_MASK | CTRL2_CPEN_MASK, ctrl2);
243 if (ret < 0) {
244 dev_err(info->dev, "failed to update MUIC register\n");
245 return ret;
246 }
247
248 dev_dbg(info->dev,
249 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
250 ctrl1, ctrl2, attached ? "attached" : "detached");
251
252 return 0;
253}
254
255/*
256 * max14577_muic_get_cable_type - Return cable type and check cable state
257 * @info: the instance including private data of max14577 MUIC
258 * @group: the path according to attached cable
259 * @attached: store cable state and return
260 *
261 * This function check the cable state either attached or detached,
262 * and then divide precise type of cable according to cable group.
263 * - max14577_CABLE_GROUP_ADC
264 * - max14577_CABLE_GROUP_CHG
265 */
266static int max14577_muic_get_cable_type(struct max14577_muic_info *info,
267 enum max14577_muic_cable_group group, bool *attached)
268{
269 int cable_type = 0;
270 int adc;
271 int chg_type;
272
273 switch (group) {
274 case MAX14577_CABLE_GROUP_ADC:
275 /*
276 * Read ADC value to check cable type and decide cable state
277 * according to cable type
278 */
279 adc = info->status[MAX14577_MUIC_STATUS1] & STATUS1_ADC_MASK;
280 adc >>= STATUS1_ADC_SHIFT;
281
282 /*
283 * Check current cable state/cable type and store cable type
284 * (info->prev_cable_type) for handling cable when cable is
285 * detached.
286 */
287 if (adc == MAX14577_MUIC_ADC_OPEN) {
288 *attached = false;
289
290 cable_type = info->prev_cable_type;
291 info->prev_cable_type = MAX14577_MUIC_ADC_OPEN;
292 } else {
293 *attached = true;
294
295 cable_type = info->prev_cable_type = adc;
296 }
297 break;
298 case MAX14577_CABLE_GROUP_CHG:
299 /*
300 * Read charger type to check cable type and decide cable state
301 * according to type of charger cable.
302 */
303 chg_type = info->status[MAX14577_MUIC_STATUS2] &
304 STATUS2_CHGTYP_MASK;
305 chg_type >>= STATUS2_CHGTYP_SHIFT;
306
307 if (chg_type == MAX14577_CHARGER_TYPE_NONE) {
308 *attached = false;
309
310 cable_type = info->prev_chg_type;
311 info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE;
312 } else {
313 *attached = true;
314
315 /*
316 * Check current cable state/cable type and store cable
317 * type(info->prev_chg_type) for handling cable when
318 * charger cable is detached.
319 */
320 cable_type = info->prev_chg_type = chg_type;
321 }
322
323 break;
324 default:
325 dev_err(info->dev, "Unknown cable group (%d)\n", group);
326 cable_type = -EINVAL;
327 break;
328 }
329
330 return cable_type;
331}
332
333static int max14577_muic_jig_handler(struct max14577_muic_info *info,
334 int cable_type, bool attached)
335{
336 char cable_name[32];
337 int ret = 0;
338 u8 path = CTRL1_SW_OPEN;
339
340 dev_dbg(info->dev,
341 "external connector is %s (adc:0x%02x)\n",
342 attached ? "attached" : "detached", cable_type);
343
344 switch (cable_type) {
345 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: /* ADC_JIG_USB_OFF */
346 /* PATH:AP_USB */
347 strcpy(cable_name, "JIG-USB-OFF");
348 path = CTRL1_SW_USB;
349 break;
350 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: /* ADC_JIG_USB_ON */
351 /* PATH:AP_USB */
352 strcpy(cable_name, "JIG-USB-ON");
353 path = CTRL1_SW_USB;
354 break;
355 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: /* ADC_JIG_UART_OFF */
356 /* PATH:AP_UART */
357 strcpy(cable_name, "JIG-UART-OFF");
358 path = CTRL1_SW_UART;
359 break;
360 default:
361 dev_err(info->dev, "failed to detect %s jig cable\n",
362 attached ? "attached" : "detached");
363 return -EINVAL;
364 }
365
366 ret = max14577_muic_set_path(info, path, attached);
367 if (ret < 0)
368 return ret;
369
370 extcon_set_cable_state(info->edev, cable_name, attached);
371
372 return 0;
373}
374
375static int max14577_muic_adc_handler(struct max14577_muic_info *info)
376{
377 int cable_type;
378 bool attached;
379 int ret = 0;
380
381 /* Check accessory state which is either detached or attached */
382 cable_type = max14577_muic_get_cable_type(info,
383 MAX14577_CABLE_GROUP_ADC, &attached);
384
385 dev_dbg(info->dev,
386 "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
387 attached ? "attached" : "detached", cable_type,
388 info->prev_cable_type);
389
390 switch (cable_type) {
391 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF:
392 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON:
393 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF:
394 /* JIG */
395 ret = max14577_muic_jig_handler(info, cable_type, attached);
396 if (ret < 0)
397 return ret;
398 break;
399 case MAX14577_MUIC_ADC_GROUND:
400 case MAX14577_MUIC_ADC_SEND_END_BUTTON:
401 case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON:
402 case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON:
403 case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON:
404 case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON:
405 case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON:
406 case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON:
407 case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON:
408 case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON:
409 case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON:
410 case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON:
411 case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON:
412 case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON:
413 case MAX14577_MUIC_ADC_RESERVED_ACC_1:
414 case MAX14577_MUIC_ADC_RESERVED_ACC_2:
415 case MAX14577_MUIC_ADC_RESERVED_ACC_3:
416 case MAX14577_MUIC_ADC_RESERVED_ACC_4:
417 case MAX14577_MUIC_ADC_RESERVED_ACC_5:
418 case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2:
419 case MAX14577_MUIC_ADC_PHONE_POWERED_DEV:
420 case MAX14577_MUIC_ADC_TTY_CONVERTER:
421 case MAX14577_MUIC_ADC_UART_CABLE:
422 case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG:
423 case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD:
424 case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG:
425 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON:
426 case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1:
427 /*
428 * This accessory isn't used in general case if it is specially
429 * needed to detect additional accessory, should implement
430 * proper operation when this accessory is attached/detached.
431 */
432 dev_info(info->dev,
433 "accessory is %s but it isn't used (adc:0x%x)\n",
434 attached ? "attached" : "detached", cable_type);
435 return -EAGAIN;
436 default:
437 dev_err(info->dev,
438 "failed to detect %s accessory (adc:0x%x)\n",
439 attached ? "attached" : "detached", cable_type);
440 return -EINVAL;
441 }
442
443 return 0;
444}
445
446static int max14577_muic_chg_handler(struct max14577_muic_info *info)
447{
448 int chg_type;
449 bool attached;
450 int ret = 0;
451
452 chg_type = max14577_muic_get_cable_type(info,
453 MAX14577_CABLE_GROUP_CHG, &attached);
454
455 dev_dbg(info->dev,
456 "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
457 attached ? "attached" : "detached",
458 chg_type, info->prev_chg_type);
459
460 switch (chg_type) {
461 case MAX14577_CHARGER_TYPE_USB:
462 /* PATH:AP_USB */
463 ret = max14577_muic_set_path(info, info->path_usb, attached);
464 if (ret < 0)
465 return ret;
466
467 extcon_set_cable_state(info->edev, "USB", attached);
468 break;
469 case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
470 extcon_set_cable_state(info->edev, "TA", attached);
471 break;
472 case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
473 extcon_set_cable_state(info->edev,
474 "Charge-downstream", attached);
475 break;
476 case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
477 extcon_set_cable_state(info->edev, "Slow-charger", attached);
478 break;
479 case MAX14577_CHARGER_TYPE_SPECIAL_1A:
480 extcon_set_cable_state(info->edev, "Fast-charger", attached);
481 break;
482 case MAX14577_CHARGER_TYPE_NONE:
483 case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
484 break;
485 default:
486 dev_err(info->dev,
487 "failed to detect %s accessory (chg_type:0x%x)\n",
488 attached ? "attached" : "detached", chg_type);
489 return -EINVAL;
490 }
491
492 return 0;
493}
494
495static void max14577_muic_irq_work(struct work_struct *work)
496{
497 struct max14577_muic_info *info = container_of(work,
498 struct max14577_muic_info, irq_work);
499 int ret = 0;
500
501 if (!info->edev)
502 return;
503
504 mutex_lock(&info->mutex);
505
506 ret = max14577_bulk_read(info->max14577->regmap,
507 MAX14577_MUIC_REG_STATUS1, info->status, 2);
508 if (ret) {
509 dev_err(info->dev, "failed to read MUIC register\n");
510 mutex_unlock(&info->mutex);
511 return;
512 }
513
514 if (info->irq_adc) {
515 ret = max14577_muic_adc_handler(info);
516 info->irq_adc = false;
517 }
518 if (info->irq_chg) {
519 ret = max14577_muic_chg_handler(info);
520 info->irq_chg = false;
521 }
522
523 if (ret < 0)
524 dev_err(info->dev, "failed to handle MUIC interrupt\n");
525
526 mutex_unlock(&info->mutex);
527
528 return;
529}
530
531static irqreturn_t max14577_muic_irq_handler(int irq, void *data)
532{
533 struct max14577_muic_info *info = data;
534 int i, irq_type = -1;
535
536 /*
537 * We may be called multiple times for different nested IRQ-s.
538 * Including changes in INT1_ADC and INT2_CGHTYP at once.
539 * However we only need to know whether it was ADC, charger
540 * or both interrupts so decode IRQ and turn on proper flags.
541 */
542 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
543 if (irq == muic_irqs[i].virq)
544 irq_type = muic_irqs[i].irq;
545
546 switch (irq_type) {
547 case MAX14577_IRQ_INT1_ADC:
548 case MAX14577_IRQ_INT1_ADCLOW:
549 case MAX14577_IRQ_INT1_ADCERR:
550 /* Handle all of accessory except for
551 type of charger accessory */
552 info->irq_adc = true;
553 break;
554 case MAX14577_IRQ_INT2_CHGTYP:
555 case MAX14577_IRQ_INT2_CHGDETRUN:
556 case MAX14577_IRQ_INT2_DCDTMR:
557 case MAX14577_IRQ_INT2_DBCHG:
558 case MAX14577_IRQ_INT2_VBVOLT:
559 /* Handle charger accessory */
560 info->irq_chg = true;
561 break;
562 default:
563 dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n",
564 irq_type);
565 return IRQ_HANDLED;
566 }
567 schedule_work(&info->irq_work);
568
569 return IRQ_HANDLED;
570}
571
572static int max14577_muic_detect_accessory(struct max14577_muic_info *info)
573{
574 int ret = 0;
575 int adc;
576 int chg_type;
577 bool attached;
578
579 mutex_lock(&info->mutex);
580
581 /* Read STATUSx register to detect accessory */
582 ret = max14577_bulk_read(info->max14577->regmap,
583 MAX14577_MUIC_REG_STATUS1, info->status, 2);
584 if (ret) {
585 dev_err(info->dev, "failed to read MUIC register\n");
586 mutex_unlock(&info->mutex);
587 return ret;
588 }
589
590 adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC,
591 &attached);
592 if (attached && adc != MAX14577_MUIC_ADC_OPEN) {
593 ret = max14577_muic_adc_handler(info);
594 if (ret < 0) {
595 dev_err(info->dev, "Cannot detect accessory\n");
596 mutex_unlock(&info->mutex);
597 return ret;
598 }
599 }
600
601 chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG,
602 &attached);
603 if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) {
604 ret = max14577_muic_chg_handler(info);
605 if (ret < 0) {
606 dev_err(info->dev, "Cannot detect charger accessory\n");
607 mutex_unlock(&info->mutex);
608 return ret;
609 }
610 }
611
612 mutex_unlock(&info->mutex);
613
614 return 0;
615}
616
617static void max14577_muic_detect_cable_wq(struct work_struct *work)
618{
619 struct max14577_muic_info *info = container_of(to_delayed_work(work),
620 struct max14577_muic_info, wq_detcable);
621
622 max14577_muic_detect_accessory(info);
623}
624
625static int max14577_muic_probe(struct platform_device *pdev)
626{
627 struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
628 struct max14577_muic_info *info;
629 int delay_jiffies;
630 int ret;
631 int i;
632 u8 id;
633
634 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
635 if (!info) {
636 dev_err(&pdev->dev, "failed to allocate memory\n");
637 return -ENOMEM;
638 }
639 info->dev = &pdev->dev;
640 info->max14577 = max14577;
641
642 platform_set_drvdata(pdev, info);
643 mutex_init(&info->mutex);
644
645 INIT_WORK(&info->irq_work, max14577_muic_irq_work);
646
647 /* Support irq domain for max14577 MUIC device */
648 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
649 struct max14577_muic_irq *muic_irq = &muic_irqs[i];
650 unsigned int virq = 0;
651
652 virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq);
653 if (!virq)
654 return -EINVAL;
655 muic_irq->virq = virq;
656
657 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
658 max14577_muic_irq_handler,
659 IRQF_NO_SUSPEND,
660 muic_irq->name, info);
661 if (ret) {
662 dev_err(&pdev->dev,
663 "failed: irq request (IRQ: %d,"
664 " error :%d)\n",
665 muic_irq->irq, ret);
666 return ret;
667 }
668 }
669
670 /* Initialize extcon device */
671 info->edev = devm_kzalloc(&pdev->dev, sizeof(*info->edev), GFP_KERNEL);
672 if (!info->edev) {
673 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
674 return -ENOMEM;
675 }
676 info->edev->name = DEV_NAME;
677 info->edev->supported_cable = max14577_extcon_cable;
678 ret = extcon_dev_register(info->edev);
679 if (ret) {
680 dev_err(&pdev->dev, "failed to register extcon device\n");
681 return ret;
682 }
683
684 /* Default h/w line path */
685 info->path_usb = CTRL1_SW_USB;
686 info->path_uart = CTRL1_SW_UART;
687 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
688
689 /* Set initial path for UART */
690 max14577_muic_set_path(info, info->path_uart, true);
691
692 /* Check revision number of MUIC device*/
693 ret = max14577_read_reg(info->max14577->regmap,
694 MAX14577_REG_DEVICEID, &id);
695 if (ret < 0) {
696 dev_err(&pdev->dev, "failed to read revision number\n");
697 goto err_extcon;
698 }
699 dev_info(info->dev, "device ID : 0x%x\n", id);
700
701 /* Set ADC debounce time */
702 max14577_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
703
704 /*
705 * Detect accessory after completing the initialization of platform
706 *
707 * - Use delayed workqueue to detect cable state and then
708 * notify cable state to notifiee/platform through uevent.
709 * After completing the booting of platform, the extcon provider
710 * driver should notify cable state to upper layer.
711 */
712 INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq);
713 ret = queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
714 delay_jiffies);
715 if (ret < 0) {
716 dev_err(&pdev->dev,
717 "failed to schedule delayed work for cable detect\n");
718 goto err_extcon;
719 }
720
721 return ret;
722
723err_extcon:
724 extcon_dev_unregister(info->edev);
725 return ret;
726}
727
728static int max14577_muic_remove(struct platform_device *pdev)
729{
730 struct max14577_muic_info *info = platform_get_drvdata(pdev);
731
732 cancel_work_sync(&info->irq_work);
733 extcon_dev_unregister(info->edev);
734
735 return 0;
736}
737
738static struct platform_driver max14577_muic_driver = {
739 .driver = {
740 .name = DEV_NAME,
741 .owner = THIS_MODULE,
742 },
743 .probe = max14577_muic_probe,
744 .remove = max14577_muic_remove,
745};
746
747module_platform_driver(max14577_muic_driver);
748
749MODULE_DESCRIPTION("MAXIM 14577 Extcon driver");
750MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
751MODULE_LICENSE("GPL");
752MODULE_ALIAS("platform:extcon-max14577");