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1// SPDX-License-Identifier: GPL-2.0+
2//
3// extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC
4//
5// Copyright (C) 2012 Samsung Electronics
6// Donggeun Kim <[email protected]>
7
8#include <linux/devm-helpers.h>
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/i2c.h>
12#include <linux/slab.h>
13#include <linux/interrupt.h>
14#include <linux/err.h>
15#include <linux/platform_device.h>
16#include <linux/kobject.h>
17#include <linux/mfd/max8997.h>
18#include <linux/mfd/max8997-private.h>
19#include <linux/extcon-provider.h>
20#include <linux/irqdomain.h>
21
22#define DEV_NAME "max8997-muic"
23#define DELAY_MS_DEFAULT 20000 /* unit: millisecond */
24
25enum max8997_muic_adc_debounce_time {
26 ADC_DEBOUNCE_TIME_0_5MS = 0, /* 0.5ms */
27 ADC_DEBOUNCE_TIME_10MS, /* 10ms */
28 ADC_DEBOUNCE_TIME_25MS, /* 25ms */
29 ADC_DEBOUNCE_TIME_38_62MS, /* 38.62ms */
30};
31
32struct max8997_muic_irq {
33 unsigned int irq;
34 const char *name;
35 unsigned int virq;
36};
37
38static struct max8997_muic_irq muic_irqs[] = {
39 { MAX8997_MUICIRQ_ADCError, "muic-ADCERROR" },
40 { MAX8997_MUICIRQ_ADCLow, "muic-ADCLOW" },
41 { MAX8997_MUICIRQ_ADC, "muic-ADC" },
42 { MAX8997_MUICIRQ_VBVolt, "muic-VBVOLT" },
43 { MAX8997_MUICIRQ_DBChg, "muic-DBCHG" },
44 { MAX8997_MUICIRQ_DCDTmr, "muic-DCDTMR" },
45 { MAX8997_MUICIRQ_ChgDetRun, "muic-CHGDETRUN" },
46 { MAX8997_MUICIRQ_ChgTyp, "muic-CHGTYP" },
47 { MAX8997_MUICIRQ_OVP, "muic-OVP" },
48 { MAX8997_PMICIRQ_CHGINS, "pmic-CHGINS" },
49 { MAX8997_PMICIRQ_CHGRM, "pmic-CHGRM" },
50};
51
52/* Define supported cable type */
53enum max8997_muic_acc_type {
54 MAX8997_MUIC_ADC_GROUND = 0x0,
55 MAX8997_MUIC_ADC_MHL, /* MHL*/
56 MAX8997_MUIC_ADC_REMOTE_S1_BUTTON,
57 MAX8997_MUIC_ADC_REMOTE_S2_BUTTON,
58 MAX8997_MUIC_ADC_REMOTE_S3_BUTTON,
59 MAX8997_MUIC_ADC_REMOTE_S4_BUTTON,
60 MAX8997_MUIC_ADC_REMOTE_S5_BUTTON,
61 MAX8997_MUIC_ADC_REMOTE_S6_BUTTON,
62 MAX8997_MUIC_ADC_REMOTE_S7_BUTTON,
63 MAX8997_MUIC_ADC_REMOTE_S8_BUTTON,
64 MAX8997_MUIC_ADC_REMOTE_S9_BUTTON,
65 MAX8997_MUIC_ADC_REMOTE_S10_BUTTON,
66 MAX8997_MUIC_ADC_REMOTE_S11_BUTTON,
67 MAX8997_MUIC_ADC_REMOTE_S12_BUTTON,
68 MAX8997_MUIC_ADC_RESERVED_ACC_1,
69 MAX8997_MUIC_ADC_RESERVED_ACC_2,
70 MAX8997_MUIC_ADC_RESERVED_ACC_3,
71 MAX8997_MUIC_ADC_RESERVED_ACC_4,
72 MAX8997_MUIC_ADC_RESERVED_ACC_5,
73 MAX8997_MUIC_ADC_CEA936_AUDIO,
74 MAX8997_MUIC_ADC_PHONE_POWERED_DEV,
75 MAX8997_MUIC_ADC_TTY_CONVERTER,
76 MAX8997_MUIC_ADC_UART_CABLE,
77 MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG,
78 MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF, /* JIG-USB-OFF */
79 MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON, /* JIG-USB-ON */
80 MAX8997_MUIC_ADC_AV_CABLE_NOLOAD, /* DESKDOCK */
81 MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG,
82 MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF, /* JIG-UART */
83 MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON, /* CARDOCK */
84 MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE,
85 MAX8997_MUIC_ADC_OPEN, /* OPEN */
86};
87
88enum max8997_muic_cable_group {
89 MAX8997_CABLE_GROUP_ADC = 0,
90 MAX8997_CABLE_GROUP_ADC_GND,
91 MAX8997_CABLE_GROUP_CHG,
92 MAX8997_CABLE_GROUP_VBVOLT,
93};
94
95enum max8997_muic_usb_type {
96 MAX8997_USB_HOST,
97 MAX8997_USB_DEVICE,
98};
99
100enum max8997_muic_charger_type {
101 MAX8997_CHARGER_TYPE_NONE = 0,
102 MAX8997_CHARGER_TYPE_USB,
103 MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT,
104 MAX8997_CHARGER_TYPE_DEDICATED_CHG,
105 MAX8997_CHARGER_TYPE_500MA,
106 MAX8997_CHARGER_TYPE_1A,
107 MAX8997_CHARGER_TYPE_DEAD_BATTERY = 7,
108};
109
110struct max8997_muic_info {
111 struct device *dev;
112 struct i2c_client *muic;
113 struct extcon_dev *edev;
114 int prev_cable_type;
115 int prev_chg_type;
116 u8 status[2];
117
118 int irq;
119 struct work_struct irq_work;
120 struct mutex mutex;
121
122 struct max8997_muic_platform_data *muic_pdata;
123 enum max8997_muic_charger_type pre_charger_type;
124
125 /*
126 * Use delayed workqueue to detect cable state and then
127 * notify cable state to notifiee/platform through uevent.
128 * After completing the booting of platform, the extcon provider
129 * driver should notify cable state to upper layer.
130 */
131 struct delayed_work wq_detcable;
132
133 /*
134 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
135 * h/w path of COMP2/COMN1 on CONTROL1 register.
136 */
137 int path_usb;
138 int path_uart;
139};
140
141static const unsigned int max8997_extcon_cable[] = {
142 EXTCON_USB,
143 EXTCON_USB_HOST,
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_DISP_MHL,
150 EXTCON_DOCK,
151 EXTCON_JIG,
152 EXTCON_NONE,
153};
154
155/*
156 * max8997_muic_set_debounce_time - Set the debounce time of ADC
157 * @info: the instance including private data of max8997 MUIC
158 * @time: the debounce time of ADC
159 */
160static int max8997_muic_set_debounce_time(struct max8997_muic_info *info,
161 enum max8997_muic_adc_debounce_time time)
162{
163 int ret;
164
165 switch (time) {
166 case ADC_DEBOUNCE_TIME_0_5MS:
167 case ADC_DEBOUNCE_TIME_10MS:
168 case ADC_DEBOUNCE_TIME_25MS:
169 case ADC_DEBOUNCE_TIME_38_62MS:
170 ret = max8997_update_reg(info->muic,
171 MAX8997_MUIC_REG_CONTROL3,
172 time << CONTROL3_ADCDBSET_SHIFT,
173 CONTROL3_ADCDBSET_MASK);
174 if (ret) {
175 dev_err(info->dev, "failed to set ADC debounce time\n");
176 return ret;
177 }
178 break;
179 default:
180 dev_err(info->dev, "invalid ADC debounce time\n");
181 return -EINVAL;
182 }
183
184 return 0;
185};
186
187/*
188 * max8997_muic_set_path - Set hardware line according to attached cable
189 * @info: the instance including private data of max8997 MUIC
190 * @value: the path according to attached cable
191 * @attached: the state of cable (true:attached, false:detached)
192 *
193 * The max8997 MUIC device share outside H/W line among a varity of cables,
194 * so this function set internal path of H/W line according to the type of
195 * attached cable.
196 */
197static int max8997_muic_set_path(struct max8997_muic_info *info,
198 u8 val, bool attached)
199{
200 int ret;
201 u8 ctrl1, ctrl2 = 0;
202
203 if (attached)
204 ctrl1 = val;
205 else
206 ctrl1 = CONTROL1_SW_OPEN;
207
208 ret = max8997_update_reg(info->muic,
209 MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK);
210 if (ret < 0) {
211 dev_err(info->dev, "failed to update MUIC register\n");
212 return ret;
213 }
214
215 if (attached)
216 ctrl2 |= CONTROL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */
217 else
218 ctrl2 |= CONTROL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */
219
220 ret = max8997_update_reg(info->muic,
221 MAX8997_MUIC_REG_CONTROL2, ctrl2,
222 CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK);
223 if (ret < 0) {
224 dev_err(info->dev, "failed to update MUIC register\n");
225 return ret;
226 }
227
228 dev_info(info->dev,
229 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
230 ctrl1, ctrl2, attached ? "attached" : "detached");
231
232 return 0;
233}
234
235/*
236 * max8997_muic_get_cable_type - Return cable type and check cable state
237 * @info: the instance including private data of max8997 MUIC
238 * @group: the path according to attached cable
239 * @attached: store cable state and return
240 *
241 * This function check the cable state either attached or detached,
242 * and then divide precise type of cable according to cable group.
243 * - MAX8997_CABLE_GROUP_ADC
244 * - MAX8997_CABLE_GROUP_CHG
245 */
246static int max8997_muic_get_cable_type(struct max8997_muic_info *info,
247 enum max8997_muic_cable_group group, bool *attached)
248{
249 int cable_type = 0;
250 int adc;
251 int chg_type;
252
253 switch (group) {
254 case MAX8997_CABLE_GROUP_ADC:
255 /*
256 * Read ADC value to check cable type and decide cable state
257 * according to cable type
258 */
259 adc = info->status[0] & STATUS1_ADC_MASK;
260 adc >>= STATUS1_ADC_SHIFT;
261
262 /*
263 * Check current cable state/cable type and store cable type
264 * (info->prev_cable_type) for handling cable when cable is
265 * detached.
266 */
267 if (adc == MAX8997_MUIC_ADC_OPEN) {
268 *attached = false;
269
270 cable_type = info->prev_cable_type;
271 info->prev_cable_type = MAX8997_MUIC_ADC_OPEN;
272 } else {
273 *attached = true;
274
275 cable_type = info->prev_cable_type = adc;
276 }
277 break;
278 case MAX8997_CABLE_GROUP_CHG:
279 /*
280 * Read charger type to check cable type and decide cable state
281 * according to type of charger cable.
282 */
283 chg_type = info->status[1] & STATUS2_CHGTYP_MASK;
284 chg_type >>= STATUS2_CHGTYP_SHIFT;
285
286 if (chg_type == MAX8997_CHARGER_TYPE_NONE) {
287 *attached = false;
288
289 cable_type = info->prev_chg_type;
290 info->prev_chg_type = MAX8997_CHARGER_TYPE_NONE;
291 } else {
292 *attached = true;
293
294 /*
295 * Check current cable state/cable type and store cable
296 * type(info->prev_chg_type) for handling cable when
297 * charger cable is detached.
298 */
299 cable_type = info->prev_chg_type = chg_type;
300 }
301
302 break;
303 default:
304 dev_err(info->dev, "Unknown cable group (%d)\n", group);
305 cable_type = -EINVAL;
306 break;
307 }
308
309 return cable_type;
310}
311
312static int max8997_muic_handle_usb(struct max8997_muic_info *info,
313 enum max8997_muic_usb_type usb_type, bool attached)
314{
315 int ret = 0;
316
317 ret = max8997_muic_set_path(info, info->path_usb, attached);
318 if (ret < 0) {
319 dev_err(info->dev, "failed to update muic register\n");
320 return ret;
321 }
322
323 switch (usb_type) {
324 case MAX8997_USB_HOST:
325 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, attached);
326 break;
327 case MAX8997_USB_DEVICE:
328 extcon_set_state_sync(info->edev, EXTCON_USB, attached);
329 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
330 attached);
331 break;
332 default:
333 dev_err(info->dev, "failed to detect %s usb cable\n",
334 attached ? "attached" : "detached");
335 return -EINVAL;
336 }
337
338 return 0;
339}
340
341static int max8997_muic_handle_dock(struct max8997_muic_info *info,
342 int cable_type, bool attached)
343{
344 int ret = 0;
345
346 ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
347 if (ret) {
348 dev_err(info->dev, "failed to update muic register\n");
349 return ret;
350 }
351
352 switch (cable_type) {
353 case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
354 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
355 extcon_set_state_sync(info->edev, EXTCON_DOCK, attached);
356 break;
357 default:
358 dev_err(info->dev, "failed to detect %s dock device\n",
359 attached ? "attached" : "detached");
360 return -EINVAL;
361 }
362
363 return 0;
364}
365
366static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
367 bool attached)
368{
369 int ret = 0;
370
371 /* switch to UART */
372 ret = max8997_muic_set_path(info, info->path_uart, attached);
373 if (ret) {
374 dev_err(info->dev, "failed to update muic register\n");
375 return ret;
376 }
377
378 extcon_set_state_sync(info->edev, EXTCON_JIG, attached);
379
380 return 0;
381}
382
383static int max8997_muic_adc_handler(struct max8997_muic_info *info)
384{
385 int cable_type;
386 bool attached;
387 int ret = 0;
388
389 /* Check cable state which is either detached or attached */
390 cable_type = max8997_muic_get_cable_type(info,
391 MAX8997_CABLE_GROUP_ADC, &attached);
392
393 switch (cable_type) {
394 case MAX8997_MUIC_ADC_GROUND:
395 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached);
396 if (ret < 0)
397 return ret;
398 break;
399 case MAX8997_MUIC_ADC_MHL:
400 extcon_set_state_sync(info->edev, EXTCON_DISP_MHL, attached);
401 break;
402 case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF:
403 case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON:
404 ret = max8997_muic_handle_usb(info,
405 MAX8997_USB_DEVICE, attached);
406 if (ret < 0)
407 return ret;
408 break;
409 case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
410 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
411 ret = max8997_muic_handle_dock(info, cable_type, attached);
412 if (ret < 0)
413 return ret;
414 break;
415 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF:
416 ret = max8997_muic_handle_jig_uart(info, attached);
417 break;
418 case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON:
419 case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON:
420 case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON:
421 case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON:
422 case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON:
423 case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON:
424 case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON:
425 case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON:
426 case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON:
427 case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON:
428 case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON:
429 case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON:
430 case MAX8997_MUIC_ADC_RESERVED_ACC_1:
431 case MAX8997_MUIC_ADC_RESERVED_ACC_2:
432 case MAX8997_MUIC_ADC_RESERVED_ACC_3:
433 case MAX8997_MUIC_ADC_RESERVED_ACC_4:
434 case MAX8997_MUIC_ADC_RESERVED_ACC_5:
435 case MAX8997_MUIC_ADC_CEA936_AUDIO:
436 case MAX8997_MUIC_ADC_PHONE_POWERED_DEV:
437 case MAX8997_MUIC_ADC_TTY_CONVERTER:
438 case MAX8997_MUIC_ADC_UART_CABLE:
439 case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG:
440 case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG:
441 case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE:
442 /*
443 * This cable isn't used in general case if it is specially
444 * needed to detect additional cable, should implement
445 * proper operation when this cable is attached/detached.
446 */
447 dev_info(info->dev,
448 "cable is %s but it isn't used (type:0x%x)\n",
449 attached ? "attached" : "detached", cable_type);
450 return -EAGAIN;
451 default:
452 dev_err(info->dev,
453 "failed to detect %s unknown cable (type:0x%x)\n",
454 attached ? "attached" : "detached", cable_type);
455 return -EINVAL;
456 }
457
458 return 0;
459}
460
461static int max8997_muic_chg_handler(struct max8997_muic_info *info)
462{
463 int chg_type;
464 bool attached;
465 int adc;
466
467 chg_type = max8997_muic_get_cable_type(info,
468 MAX8997_CABLE_GROUP_CHG, &attached);
469
470 switch (chg_type) {
471 case MAX8997_CHARGER_TYPE_NONE:
472 break;
473 case MAX8997_CHARGER_TYPE_USB:
474 adc = info->status[0] & STATUS1_ADC_MASK;
475 adc >>= STATUS1_ADC_SHIFT;
476
477 if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) {
478 max8997_muic_handle_usb(info,
479 MAX8997_USB_DEVICE, attached);
480 }
481 break;
482 case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
483 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP,
484 attached);
485 break;
486 case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
487 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
488 attached);
489 break;
490 case MAX8997_CHARGER_TYPE_500MA:
491 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW,
492 attached);
493 break;
494 case MAX8997_CHARGER_TYPE_1A:
495 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST,
496 attached);
497 break;
498 default:
499 dev_err(info->dev,
500 "failed to detect %s unknown chg cable (type:0x%x)\n",
501 attached ? "attached" : "detached", chg_type);
502 return -EINVAL;
503 }
504
505 return 0;
506}
507
508static void max8997_muic_irq_work(struct work_struct *work)
509{
510 struct max8997_muic_info *info = container_of(work,
511 struct max8997_muic_info, irq_work);
512 int irq_type = 0;
513 int i, ret;
514
515 if (!info->edev)
516 return;
517
518 mutex_lock(&info->mutex);
519
520 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
521 if (info->irq == muic_irqs[i].virq)
522 irq_type = muic_irqs[i].irq;
523
524 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
525 2, info->status);
526 if (ret) {
527 dev_err(info->dev, "failed to read muic register\n");
528 mutex_unlock(&info->mutex);
529 return;
530 }
531
532 switch (irq_type) {
533 case MAX8997_MUICIRQ_ADCError:
534 case MAX8997_MUICIRQ_ADCLow:
535 case MAX8997_MUICIRQ_ADC:
536 /* Handle all of cable except for charger cable */
537 ret = max8997_muic_adc_handler(info);
538 break;
539 case MAX8997_MUICIRQ_VBVolt:
540 case MAX8997_MUICIRQ_DBChg:
541 case MAX8997_MUICIRQ_DCDTmr:
542 case MAX8997_MUICIRQ_ChgDetRun:
543 case MAX8997_MUICIRQ_ChgTyp:
544 case MAX8997_PMICIRQ_CHGINS:
545 case MAX8997_PMICIRQ_CHGRM:
546 /* Handle charger cable */
547 ret = max8997_muic_chg_handler(info);
548 break;
549 case MAX8997_MUICIRQ_OVP:
550 break;
551 default:
552 dev_info(info->dev, "misc interrupt: irq %d occurred\n",
553 irq_type);
554 mutex_unlock(&info->mutex);
555 return;
556 }
557
558 if (ret < 0)
559 dev_err(info->dev, "failed to handle MUIC interrupt\n");
560
561 mutex_unlock(&info->mutex);
562}
563
564static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
565{
566 struct max8997_muic_info *info = data;
567
568 dev_dbg(info->dev, "irq:%d\n", irq);
569 info->irq = irq;
570
571 schedule_work(&info->irq_work);
572
573 return IRQ_HANDLED;
574}
575
576static int max8997_muic_detect_dev(struct max8997_muic_info *info)
577{
578 int ret = 0;
579 int adc;
580 int chg_type;
581 bool attached;
582
583 mutex_lock(&info->mutex);
584
585 /* Read STATUSx register to detect accessory */
586 ret = max8997_bulk_read(info->muic,
587 MAX8997_MUIC_REG_STATUS1, 2, info->status);
588 if (ret) {
589 dev_err(info->dev, "failed to read MUIC register\n");
590 mutex_unlock(&info->mutex);
591 return ret;
592 }
593
594 adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC,
595 &attached);
596 if (attached && adc != MAX8997_MUIC_ADC_OPEN) {
597 ret = max8997_muic_adc_handler(info);
598 if (ret < 0) {
599 dev_err(info->dev, "Cannot detect ADC cable\n");
600 mutex_unlock(&info->mutex);
601 return ret;
602 }
603 }
604
605 chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG,
606 &attached);
607 if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) {
608 ret = max8997_muic_chg_handler(info);
609 if (ret < 0) {
610 dev_err(info->dev, "Cannot detect charger cable\n");
611 mutex_unlock(&info->mutex);
612 return ret;
613 }
614 }
615
616 mutex_unlock(&info->mutex);
617
618 return 0;
619}
620
621static void max8997_muic_detect_cable_wq(struct work_struct *work)
622{
623 struct max8997_muic_info *info = container_of(to_delayed_work(work),
624 struct max8997_muic_info, wq_detcable);
625 int ret;
626
627 ret = max8997_muic_detect_dev(info);
628 if (ret < 0)
629 dev_err(info->dev, "failed to detect cable type\n");
630}
631
632static int max8997_muic_probe(struct platform_device *pdev)
633{
634 struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
635 struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
636 struct max8997_muic_info *info;
637 int delay_jiffies;
638 int cable_type;
639 bool attached;
640 int ret, i;
641
642 info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info),
643 GFP_KERNEL);
644 if (!info)
645 return -ENOMEM;
646
647 info->dev = &pdev->dev;
648 info->muic = max8997->muic;
649
650 platform_set_drvdata(pdev, info);
651 mutex_init(&info->mutex);
652
653 INIT_WORK(&info->irq_work, max8997_muic_irq_work);
654 ret = devm_work_autocancel(&pdev->dev, &info->irq_work,
655 max8997_muic_irq_work);
656 if (ret)
657 return ret;
658
659 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
660 struct max8997_muic_irq *muic_irq = &muic_irqs[i];
661 unsigned int virq = 0;
662
663 virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
664 if (!virq)
665 return -EINVAL;
666
667 muic_irq->virq = virq;
668
669 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
670 max8997_muic_irq_handler,
671 IRQF_NO_SUSPEND,
672 muic_irq->name, info);
673 if (ret) {
674 dev_err(&pdev->dev,
675 "failed: irq request (IRQ: %d, error :%d)\n",
676 muic_irq->irq, ret);
677 return ret;
678 }
679 }
680
681 /* External connector */
682 info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable);
683 if (IS_ERR(info->edev)) {
684 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
685 return PTR_ERR(info->edev);
686 }
687
688 ret = devm_extcon_dev_register(&pdev->dev, info->edev);
689 if (ret) {
690 dev_err(&pdev->dev, "failed to register extcon device\n");
691 return ret;
692 }
693
694 if (pdata && pdata->muic_pdata) {
695 struct max8997_muic_platform_data *muic_pdata
696 = pdata->muic_pdata;
697
698 /* Initialize registers according to platform data */
699 for (i = 0; i < muic_pdata->num_init_data; i++) {
700 max8997_write_reg(info->muic,
701 muic_pdata->init_data[i].addr,
702 muic_pdata->init_data[i].data);
703 }
704
705 /*
706 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
707 * h/w path of COMP2/COMN1 on CONTROL1 register.
708 */
709 if (muic_pdata->path_uart)
710 info->path_uart = muic_pdata->path_uart;
711 else
712 info->path_uart = CONTROL1_SW_UART;
713
714 if (muic_pdata->path_usb)
715 info->path_usb = muic_pdata->path_usb;
716 else
717 info->path_usb = CONTROL1_SW_USB;
718
719 /*
720 * Default delay time for detecting cable state
721 * after certain time.
722 */
723 if (muic_pdata->detcable_delay_ms)
724 delay_jiffies =
725 msecs_to_jiffies(muic_pdata->detcable_delay_ms);
726 else
727 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
728 } else {
729 info->path_uart = CONTROL1_SW_UART;
730 info->path_usb = CONTROL1_SW_USB;
731 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
732 }
733
734 /* Set initial path for UART when JIG is connected to get serial logs */
735 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
736 2, info->status);
737 if (ret) {
738 dev_err(info->dev, "failed to read MUIC register\n");
739 return ret;
740 }
741 cable_type = max8997_muic_get_cable_type(info,
742 MAX8997_CABLE_GROUP_ADC, &attached);
743 if (attached && cable_type == MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF)
744 max8997_muic_set_path(info, info->path_uart, true);
745
746 /* Set ADC debounce time */
747 max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
748
749 /*
750 * Detect accessory after completing the initialization of platform
751 *
752 * - Use delayed workqueue to detect cable state and then
753 * notify cable state to notifiee/platform through uevent.
754 * After completing the booting of platform, the extcon provider
755 * driver should notify cable state to upper layer.
756 */
757 INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq);
758 queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
759 delay_jiffies);
760
761 return 0;
762}
763
764static struct platform_driver max8997_muic_driver = {
765 .driver = {
766 .name = DEV_NAME,
767 },
768 .probe = max8997_muic_probe,
769};
770
771module_platform_driver(max8997_muic_driver);
772
773MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
774MODULE_AUTHOR("Donggeun Kim <[email protected]>");
775MODULE_LICENSE("GPL");
776MODULE_ALIAS("platform:max8997-muic");