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