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 <dg77.kim@samsung.com>
7
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/i2c.h>
11 #include <linux/slab.h>
12 #include <linux/interrupt.h>
13 #include <linux/err.h>
14 #include <linux/platform_device.h>
15 #include <linux/kobject.h>
16 #include <linux/mfd/max8997.h>
17 #include <linux/mfd/max8997-private.h>
18 #include <linux/extcon-provider.h>
19 #include <linux/irqdomain.h>
20
21 #define DEV_NAME "max8997-muic"
22 #define DELAY_MS_DEFAULT 20000 /* unit: millisecond */
23
24 enum max8997_muic_adc_debounce_time {
25 ADC_DEBOUNCE_TIME_0_5MS = 0, /* 0.5ms */
26 ADC_DEBOUNCE_TIME_10MS, /* 10ms */
27 ADC_DEBOUNCE_TIME_25MS, /* 25ms */
28 ADC_DEBOUNCE_TIME_38_62MS, /* 38.62ms */
29 };
30
31 struct max8997_muic_irq {
32 unsigned int irq;
33 const char *name;
34 unsigned int virq;
35 };
36
37 static struct max8997_muic_irq muic_irqs[] = {
38 { MAX8997_MUICIRQ_ADCError, "muic-ADCERROR" },
39 { MAX8997_MUICIRQ_ADCLow, "muic-ADCLOW" },
40 { MAX8997_MUICIRQ_ADC, "muic-ADC" },
41 { MAX8997_MUICIRQ_VBVolt, "muic-VBVOLT" },
42 { MAX8997_MUICIRQ_DBChg, "muic-DBCHG" },
43 { MAX8997_MUICIRQ_DCDTmr, "muic-DCDTMR" },
44 { MAX8997_MUICIRQ_ChgDetRun, "muic-CHGDETRUN" },
45 { MAX8997_MUICIRQ_ChgTyp, "muic-CHGTYP" },
46 { MAX8997_MUICIRQ_OVP, "muic-OVP" },
47 };
48
49 /* Define supported cable type */
50 enum max8997_muic_acc_type {
51 MAX8997_MUIC_ADC_GROUND = 0x0,
52 MAX8997_MUIC_ADC_MHL, /* MHL*/
53 MAX8997_MUIC_ADC_REMOTE_S1_BUTTON,
54 MAX8997_MUIC_ADC_REMOTE_S2_BUTTON,
55 MAX8997_MUIC_ADC_REMOTE_S3_BUTTON,
56 MAX8997_MUIC_ADC_REMOTE_S4_BUTTON,
57 MAX8997_MUIC_ADC_REMOTE_S5_BUTTON,
58 MAX8997_MUIC_ADC_REMOTE_S6_BUTTON,
59 MAX8997_MUIC_ADC_REMOTE_S7_BUTTON,
60 MAX8997_MUIC_ADC_REMOTE_S8_BUTTON,
61 MAX8997_MUIC_ADC_REMOTE_S9_BUTTON,
62 MAX8997_MUIC_ADC_REMOTE_S10_BUTTON,
63 MAX8997_MUIC_ADC_REMOTE_S11_BUTTON,
64 MAX8997_MUIC_ADC_REMOTE_S12_BUTTON,
65 MAX8997_MUIC_ADC_RESERVED_ACC_1,
66 MAX8997_MUIC_ADC_RESERVED_ACC_2,
67 MAX8997_MUIC_ADC_RESERVED_ACC_3,
68 MAX8997_MUIC_ADC_RESERVED_ACC_4,
69 MAX8997_MUIC_ADC_RESERVED_ACC_5,
70 MAX8997_MUIC_ADC_CEA936_AUDIO,
71 MAX8997_MUIC_ADC_PHONE_POWERED_DEV,
72 MAX8997_MUIC_ADC_TTY_CONVERTER,
73 MAX8997_MUIC_ADC_UART_CABLE,
74 MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG,
75 MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF, /* JIG-USB-OFF */
76 MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON, /* JIG-USB-ON */
77 MAX8997_MUIC_ADC_AV_CABLE_NOLOAD, /* DESKDOCK */
78 MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG,
79 MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF, /* JIG-UART */
80 MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON, /* CARDOCK */
81 MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE,
82 MAX8997_MUIC_ADC_OPEN, /* OPEN */
83 };
84
85 enum max8997_muic_cable_group {
86 MAX8997_CABLE_GROUP_ADC = 0,
87 MAX8997_CABLE_GROUP_ADC_GND,
88 MAX8997_CABLE_GROUP_CHG,
89 MAX8997_CABLE_GROUP_VBVOLT,
90 };
91
92 enum max8997_muic_usb_type {
93 MAX8997_USB_HOST,
94 MAX8997_USB_DEVICE,
95 };
96
97 enum max8997_muic_charger_type {
98 MAX8997_CHARGER_TYPE_NONE = 0,
99 MAX8997_CHARGER_TYPE_USB,
100 MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT,
101 MAX8997_CHARGER_TYPE_DEDICATED_CHG,
102 MAX8997_CHARGER_TYPE_500MA,
103 MAX8997_CHARGER_TYPE_1A,
104 MAX8997_CHARGER_TYPE_DEAD_BATTERY = 7,
105 };
106
107 struct max8997_muic_info {
108 struct device *dev;
109 struct i2c_client *muic;
110 struct extcon_dev *edev;
111 int prev_cable_type;
112 int prev_chg_type;
113 u8 status[2];
114
115 int irq;
116 struct work_struct irq_work;
117 struct mutex mutex;
118
119 struct max8997_muic_platform_data *muic_pdata;
120 enum max8997_muic_charger_type pre_charger_type;
121
122 /*
123 * Use delayed workqueue to detect cable state and then
124 * notify cable state to notifiee/platform through uevent.
125 * After completing the booting of platform, the extcon provider
126 * driver should notify cable state to upper layer.
127 */
128 struct delayed_work wq_detcable;
129
130 /*
131 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
132 * h/w path of COMP2/COMN1 on CONTROL1 register.
133 */
134 int path_usb;
135 int path_uart;
136 };
137
138 static const unsigned int max8997_extcon_cable[] = {
139 EXTCON_USB,
140 EXTCON_USB_HOST,
141 EXTCON_CHG_USB_SDP,
142 EXTCON_CHG_USB_DCP,
143 EXTCON_CHG_USB_FAST,
144 EXTCON_CHG_USB_SLOW,
145 EXTCON_CHG_USB_CDP,
146 EXTCON_DISP_MHL,
147 EXTCON_DOCK,
148 EXTCON_JIG,
149 EXTCON_NONE,
150 };
151
152 /*
153 * max8997_muic_set_debounce_time - Set the debounce time of ADC
154 * @info: the instance including private data of max8997 MUIC
155 * @time: the debounce time of ADC
156 */
max8997_muic_set_debounce_time(struct max8997_muic_info * info,enum max8997_muic_adc_debounce_time time)157 static int max8997_muic_set_debounce_time(struct max8997_muic_info *info,
158 enum max8997_muic_adc_debounce_time time)
159 {
160 int ret;
161
162 switch (time) {
163 case ADC_DEBOUNCE_TIME_0_5MS:
164 case ADC_DEBOUNCE_TIME_10MS:
165 case ADC_DEBOUNCE_TIME_25MS:
166 case ADC_DEBOUNCE_TIME_38_62MS:
167 ret = max8997_update_reg(info->muic,
168 MAX8997_MUIC_REG_CONTROL3,
169 time << CONTROL3_ADCDBSET_SHIFT,
170 CONTROL3_ADCDBSET_MASK);
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 * max8997_muic_set_path - Set hardware line according to attached cable
186 * @info: the instance including private data of max8997 MUIC
187 * @value: the path according to attached cable
188 * @attached: the state of cable (true:attached, false:detached)
189 *
190 * The max8997 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 */
max8997_muic_set_path(struct max8997_muic_info * info,u8 val,bool attached)194 static int max8997_muic_set_path(struct max8997_muic_info *info,
195 u8 val, bool attached)
196 {
197 int ret;
198 u8 ctrl1, ctrl2 = 0;
199
200 if (attached)
201 ctrl1 = val;
202 else
203 ctrl1 = CONTROL1_SW_OPEN;
204
205 ret = max8997_update_reg(info->muic,
206 MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK);
207 if (ret < 0) {
208 dev_err(info->dev, "failed to update MUIC register\n");
209 return ret;
210 }
211
212 if (attached)
213 ctrl2 |= CONTROL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */
214 else
215 ctrl2 |= CONTROL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */
216
217 ret = max8997_update_reg(info->muic,
218 MAX8997_MUIC_REG_CONTROL2, ctrl2,
219 CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK);
220 if (ret < 0) {
221 dev_err(info->dev, "failed to update MUIC register\n");
222 return ret;
223 }
224
225 dev_info(info->dev,
226 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
227 ctrl1, ctrl2, attached ? "attached" : "detached");
228
229 return 0;
230 }
231
232 /*
233 * max8997_muic_get_cable_type - Return cable type and check cable state
234 * @info: the instance including private data of max8997 MUIC
235 * @group: the path according to attached cable
236 * @attached: store cable state and return
237 *
238 * This function check the cable state either attached or detached,
239 * and then divide precise type of cable according to cable group.
240 * - MAX8997_CABLE_GROUP_ADC
241 * - MAX8997_CABLE_GROUP_CHG
242 */
max8997_muic_get_cable_type(struct max8997_muic_info * info,enum max8997_muic_cable_group group,bool * attached)243 static int max8997_muic_get_cable_type(struct max8997_muic_info *info,
244 enum max8997_muic_cable_group group, bool *attached)
245 {
246 int cable_type = 0;
247 int adc;
248 int chg_type;
249
250 switch (group) {
251 case MAX8997_CABLE_GROUP_ADC:
252 /*
253 * Read ADC value to check cable type and decide cable state
254 * according to cable type
255 */
256 adc = info->status[0] & STATUS1_ADC_MASK;
257 adc >>= STATUS1_ADC_SHIFT;
258
259 /*
260 * Check current cable state/cable type and store cable type
261 * (info->prev_cable_type) for handling cable when cable is
262 * detached.
263 */
264 if (adc == MAX8997_MUIC_ADC_OPEN) {
265 *attached = false;
266
267 cable_type = info->prev_cable_type;
268 info->prev_cable_type = MAX8997_MUIC_ADC_OPEN;
269 } else {
270 *attached = true;
271
272 cable_type = info->prev_cable_type = adc;
273 }
274 break;
275 case MAX8997_CABLE_GROUP_CHG:
276 /*
277 * Read charger type to check cable type and decide cable state
278 * according to type of charger cable.
279 */
280 chg_type = info->status[1] & STATUS2_CHGTYP_MASK;
281 chg_type >>= STATUS2_CHGTYP_SHIFT;
282
283 if (chg_type == MAX8997_CHARGER_TYPE_NONE) {
284 *attached = false;
285
286 cable_type = info->prev_chg_type;
287 info->prev_chg_type = MAX8997_CHARGER_TYPE_NONE;
288 } else {
289 *attached = true;
290
291 /*
292 * Check current cable state/cable type and store cable
293 * type(info->prev_chg_type) for handling cable when
294 * charger cable is detached.
295 */
296 cable_type = info->prev_chg_type = chg_type;
297 }
298
299 break;
300 default:
301 dev_err(info->dev, "Unknown cable group (%d)\n", group);
302 cable_type = -EINVAL;
303 break;
304 }
305
306 return cable_type;
307 }
308
max8997_muic_handle_usb(struct max8997_muic_info * info,enum max8997_muic_usb_type usb_type,bool attached)309 static int max8997_muic_handle_usb(struct max8997_muic_info *info,
310 enum max8997_muic_usb_type usb_type, bool attached)
311 {
312 int ret = 0;
313
314 ret = max8997_muic_set_path(info, info->path_usb, attached);
315 if (ret < 0) {
316 dev_err(info->dev, "failed to update muic register\n");
317 return ret;
318 }
319
320 switch (usb_type) {
321 case MAX8997_USB_HOST:
322 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, attached);
323 break;
324 case MAX8997_USB_DEVICE:
325 extcon_set_state_sync(info->edev, EXTCON_USB, attached);
326 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
327 attached);
328 break;
329 default:
330 dev_err(info->dev, "failed to detect %s usb cable\n",
331 attached ? "attached" : "detached");
332 return -EINVAL;
333 }
334
335 return 0;
336 }
337
max8997_muic_handle_dock(struct max8997_muic_info * info,int cable_type,bool attached)338 static int max8997_muic_handle_dock(struct max8997_muic_info *info,
339 int cable_type, bool attached)
340 {
341 int ret = 0;
342
343 ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
344 if (ret) {
345 dev_err(info->dev, "failed to update muic register\n");
346 return ret;
347 }
348
349 switch (cable_type) {
350 case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
351 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
352 extcon_set_state_sync(info->edev, EXTCON_DOCK, attached);
353 break;
354 default:
355 dev_err(info->dev, "failed to detect %s dock device\n",
356 attached ? "attached" : "detached");
357 return -EINVAL;
358 }
359
360 return 0;
361 }
362
max8997_muic_handle_jig_uart(struct max8997_muic_info * info,bool attached)363 static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
364 bool attached)
365 {
366 int ret = 0;
367
368 /* switch to UART */
369 ret = max8997_muic_set_path(info, info->path_uart, attached);
370 if (ret) {
371 dev_err(info->dev, "failed to update muic register\n");
372 return ret;
373 }
374
375 extcon_set_state_sync(info->edev, EXTCON_JIG, attached);
376
377 return 0;
378 }
379
max8997_muic_adc_handler(struct max8997_muic_info * info)380 static int max8997_muic_adc_handler(struct max8997_muic_info *info)
381 {
382 int cable_type;
383 bool attached;
384 int ret = 0;
385
386 /* Check cable state which is either detached or attached */
387 cable_type = max8997_muic_get_cable_type(info,
388 MAX8997_CABLE_GROUP_ADC, &attached);
389
390 switch (cable_type) {
391 case MAX8997_MUIC_ADC_GROUND:
392 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached);
393 if (ret < 0)
394 return ret;
395 break;
396 case MAX8997_MUIC_ADC_MHL:
397 extcon_set_state_sync(info->edev, EXTCON_DISP_MHL, attached);
398 break;
399 case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF:
400 case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON:
401 ret = max8997_muic_handle_usb(info,
402 MAX8997_USB_DEVICE, attached);
403 if (ret < 0)
404 return ret;
405 break;
406 case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
407 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
408 ret = max8997_muic_handle_dock(info, cable_type, attached);
409 if (ret < 0)
410 return ret;
411 break;
412 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF:
413 ret = max8997_muic_handle_jig_uart(info, attached);
414 break;
415 case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON:
416 case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON:
417 case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON:
418 case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON:
419 case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON:
420 case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON:
421 case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON:
422 case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON:
423 case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON:
424 case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON:
425 case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON:
426 case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON:
427 case MAX8997_MUIC_ADC_RESERVED_ACC_1:
428 case MAX8997_MUIC_ADC_RESERVED_ACC_2:
429 case MAX8997_MUIC_ADC_RESERVED_ACC_3:
430 case MAX8997_MUIC_ADC_RESERVED_ACC_4:
431 case MAX8997_MUIC_ADC_RESERVED_ACC_5:
432 case MAX8997_MUIC_ADC_CEA936_AUDIO:
433 case MAX8997_MUIC_ADC_PHONE_POWERED_DEV:
434 case MAX8997_MUIC_ADC_TTY_CONVERTER:
435 case MAX8997_MUIC_ADC_UART_CABLE:
436 case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG:
437 case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG:
438 case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE:
439 /*
440 * This cable isn't used in general case if it is specially
441 * needed to detect additional cable, should implement
442 * proper operation when this cable is attached/detached.
443 */
444 dev_info(info->dev,
445 "cable is %s but it isn't used (type:0x%x)\n",
446 attached ? "attached" : "detached", cable_type);
447 return -EAGAIN;
448 default:
449 dev_err(info->dev,
450 "failed to detect %s unknown cable (type:0x%x)\n",
451 attached ? "attached" : "detached", cable_type);
452 return -EINVAL;
453 }
454
455 return 0;
456 }
457
max8997_muic_chg_handler(struct max8997_muic_info * info)458 static int max8997_muic_chg_handler(struct max8997_muic_info *info)
459 {
460 int chg_type;
461 bool attached;
462 int adc;
463
464 chg_type = max8997_muic_get_cable_type(info,
465 MAX8997_CABLE_GROUP_CHG, &attached);
466
467 switch (chg_type) {
468 case MAX8997_CHARGER_TYPE_NONE:
469 break;
470 case MAX8997_CHARGER_TYPE_USB:
471 adc = info->status[0] & STATUS1_ADC_MASK;
472 adc >>= STATUS1_ADC_SHIFT;
473
474 if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) {
475 max8997_muic_handle_usb(info,
476 MAX8997_USB_DEVICE, attached);
477 }
478 break;
479 case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
480 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP,
481 attached);
482 break;
483 case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
484 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
485 attached);
486 break;
487 case MAX8997_CHARGER_TYPE_500MA:
488 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW,
489 attached);
490 break;
491 case MAX8997_CHARGER_TYPE_1A:
492 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST,
493 attached);
494 break;
495 default:
496 dev_err(info->dev,
497 "failed to detect %s unknown chg cable (type:0x%x)\n",
498 attached ? "attached" : "detached", chg_type);
499 return -EINVAL;
500 }
501
502 return 0;
503 }
504
max8997_muic_irq_work(struct work_struct * work)505 static void max8997_muic_irq_work(struct work_struct *work)
506 {
507 struct max8997_muic_info *info = container_of(work,
508 struct max8997_muic_info, irq_work);
509 int irq_type = 0;
510 int i, ret;
511
512 if (!info->edev)
513 return;
514
515 mutex_lock(&info->mutex);
516
517 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
518 if (info->irq == muic_irqs[i].virq)
519 irq_type = muic_irqs[i].irq;
520
521 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
522 2, info->status);
523 if (ret) {
524 dev_err(info->dev, "failed to read muic register\n");
525 mutex_unlock(&info->mutex);
526 return;
527 }
528
529 switch (irq_type) {
530 case MAX8997_MUICIRQ_ADCError:
531 case MAX8997_MUICIRQ_ADCLow:
532 case MAX8997_MUICIRQ_ADC:
533 /* Handle all of cable except for charger cable */
534 ret = max8997_muic_adc_handler(info);
535 break;
536 case MAX8997_MUICIRQ_VBVolt:
537 case MAX8997_MUICIRQ_DBChg:
538 case MAX8997_MUICIRQ_DCDTmr:
539 case MAX8997_MUICIRQ_ChgDetRun:
540 case MAX8997_MUICIRQ_ChgTyp:
541 /* Handle charger cable */
542 ret = max8997_muic_chg_handler(info);
543 break;
544 case MAX8997_MUICIRQ_OVP:
545 break;
546 default:
547 dev_info(info->dev, "misc interrupt: irq %d occurred\n",
548 irq_type);
549 mutex_unlock(&info->mutex);
550 return;
551 }
552
553 if (ret < 0)
554 dev_err(info->dev, "failed to handle MUIC interrupt\n");
555
556 mutex_unlock(&info->mutex);
557 }
558
max8997_muic_irq_handler(int irq,void * data)559 static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
560 {
561 struct max8997_muic_info *info = data;
562
563 dev_dbg(info->dev, "irq:%d\n", irq);
564 info->irq = irq;
565
566 schedule_work(&info->irq_work);
567
568 return IRQ_HANDLED;
569 }
570
max8997_muic_detect_dev(struct max8997_muic_info * info)571 static int max8997_muic_detect_dev(struct max8997_muic_info *info)
572 {
573 int ret = 0;
574 int adc;
575 int chg_type;
576 bool attached;
577
578 mutex_lock(&info->mutex);
579
580 /* Read STATUSx register to detect accessory */
581 ret = max8997_bulk_read(info->muic,
582 MAX8997_MUIC_REG_STATUS1, 2, info->status);
583 if (ret) {
584 dev_err(info->dev, "failed to read MUIC register\n");
585 mutex_unlock(&info->mutex);
586 return ret;
587 }
588
589 adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC,
590 &attached);
591 if (attached && adc != MAX8997_MUIC_ADC_OPEN) {
592 ret = max8997_muic_adc_handler(info);
593 if (ret < 0) {
594 dev_err(info->dev, "Cannot detect ADC cable\n");
595 mutex_unlock(&info->mutex);
596 return ret;
597 }
598 }
599
600 chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG,
601 &attached);
602 if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) {
603 ret = max8997_muic_chg_handler(info);
604 if (ret < 0) {
605 dev_err(info->dev, "Cannot detect charger cable\n");
606 mutex_unlock(&info->mutex);
607 return ret;
608 }
609 }
610
611 mutex_unlock(&info->mutex);
612
613 return 0;
614 }
615
max8997_muic_detect_cable_wq(struct work_struct * work)616 static void max8997_muic_detect_cable_wq(struct work_struct *work)
617 {
618 struct max8997_muic_info *info = container_of(to_delayed_work(work),
619 struct max8997_muic_info, wq_detcable);
620 int ret;
621
622 ret = max8997_muic_detect_dev(info);
623 if (ret < 0)
624 dev_err(info->dev, "failed to detect cable type\n");
625 }
626
max8997_muic_probe(struct platform_device * pdev)627 static int max8997_muic_probe(struct platform_device *pdev)
628 {
629 struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
630 struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
631 struct max8997_muic_info *info;
632 int delay_jiffies;
633 int cable_type;
634 bool attached;
635 int ret, i;
636
637 info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info),
638 GFP_KERNEL);
639 if (!info)
640 return -ENOMEM;
641
642 info->dev = &pdev->dev;
643 info->muic = max8997->muic;
644
645 platform_set_drvdata(pdev, info);
646 mutex_init(&info->mutex);
647
648 INIT_WORK(&info->irq_work, max8997_muic_irq_work);
649
650 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
651 struct max8997_muic_irq *muic_irq = &muic_irqs[i];
652 unsigned int virq = 0;
653
654 virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
655 if (!virq) {
656 ret = -EINVAL;
657 goto err_irq;
658 }
659 muic_irq->virq = virq;
660
661 ret = request_threaded_irq(virq, NULL,
662 max8997_muic_irq_handler,
663 IRQF_NO_SUSPEND,
664 muic_irq->name, info);
665 if (ret) {
666 dev_err(&pdev->dev,
667 "failed: irq request (IRQ: %d, error :%d)\n",
668 muic_irq->irq, ret);
669 goto err_irq;
670 }
671 }
672
673 /* External connector */
674 info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable);
675 if (IS_ERR(info->edev)) {
676 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
677 ret = PTR_ERR(info->edev);
678 goto err_irq;
679 }
680
681 ret = devm_extcon_dev_register(&pdev->dev, info->edev);
682 if (ret) {
683 dev_err(&pdev->dev, "failed to register extcon device\n");
684 goto err_irq;
685 }
686
687 if (pdata && pdata->muic_pdata) {
688 struct max8997_muic_platform_data *muic_pdata
689 = pdata->muic_pdata;
690
691 /* Initialize registers according to platform data */
692 for (i = 0; i < muic_pdata->num_init_data; i++) {
693 max8997_write_reg(info->muic,
694 muic_pdata->init_data[i].addr,
695 muic_pdata->init_data[i].data);
696 }
697
698 /*
699 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
700 * h/w path of COMP2/COMN1 on CONTROL1 register.
701 */
702 if (muic_pdata->path_uart)
703 info->path_uart = muic_pdata->path_uart;
704 else
705 info->path_uart = CONTROL1_SW_UART;
706
707 if (muic_pdata->path_usb)
708 info->path_usb = muic_pdata->path_usb;
709 else
710 info->path_usb = CONTROL1_SW_USB;
711
712 /*
713 * Default delay time for detecting cable state
714 * after certain time.
715 */
716 if (muic_pdata->detcable_delay_ms)
717 delay_jiffies =
718 msecs_to_jiffies(muic_pdata->detcable_delay_ms);
719 else
720 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
721 } else {
722 info->path_uart = CONTROL1_SW_UART;
723 info->path_usb = CONTROL1_SW_USB;
724 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
725 }
726
727 /* Set initial path for UART when JIG is connected to get serial logs */
728 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
729 2, info->status);
730 if (ret) {
731 dev_err(info->dev, "failed to read MUIC register\n");
732 return ret;
733 }
734 cable_type = max8997_muic_get_cable_type(info,
735 MAX8997_CABLE_GROUP_ADC, &attached);
736 if (attached && cable_type == MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF)
737 max8997_muic_set_path(info, info->path_uart, true);
738
739 /* Set ADC debounce time */
740 max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
741
742 /*
743 * Detect accessory after completing the initialization of platform
744 *
745 * - Use delayed workqueue to detect cable state and then
746 * notify cable state to notifiee/platform through uevent.
747 * After completing the booting of platform, the extcon provider
748 * driver should notify cable state to upper layer.
749 */
750 INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq);
751 queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
752 delay_jiffies);
753
754 return 0;
755
756 err_irq:
757 while (--i >= 0)
758 free_irq(muic_irqs[i].virq, info);
759 return ret;
760 }
761
max8997_muic_remove(struct platform_device * pdev)762 static int max8997_muic_remove(struct platform_device *pdev)
763 {
764 struct max8997_muic_info *info = platform_get_drvdata(pdev);
765 int i;
766
767 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
768 free_irq(muic_irqs[i].virq, info);
769 cancel_work_sync(&info->irq_work);
770
771 return 0;
772 }
773
774 static struct platform_driver max8997_muic_driver = {
775 .driver = {
776 .name = DEV_NAME,
777 },
778 .probe = max8997_muic_probe,
779 .remove = max8997_muic_remove,
780 };
781
782 module_platform_driver(max8997_muic_driver);
783
784 MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
785 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
786 MODULE_LICENSE("GPL");
787
