1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * extcon-rt8973a.c - Richtek RT8973A extcon driver to support USB switches
4 *
5 * Copyright (c) 2014 Samsung Electronics Co., Ltd
6 * Author: Chanwoo Choi <cw00.choi@samsung.com>
7 */
8
9 #include <linux/err.h>
10 #include <linux/i2c.h>
11 #include <linux/input.h>
12 #include <linux/interrupt.h>
13 #include <linux/irqdomain.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
17 #include <linux/regmap.h>
18 #include <linux/slab.h>
19 #include <linux/extcon-provider.h>
20
21 #include "extcon-rt8973a.h"
22
23 #define DELAY_MS_DEFAULT 20000 /* unit: millisecond */
24
25 struct muic_irq {
26 unsigned int irq;
27 const char *name;
28 unsigned int virq;
29 };
30
31 struct reg_data {
32 u8 reg;
33 u8 mask;
34 u8 val;
35 bool invert;
36 };
37
38 struct rt8973a_muic_info {
39 struct device *dev;
40 struct extcon_dev *edev;
41
42 struct i2c_client *i2c;
43 struct regmap *regmap;
44
45 struct regmap_irq_chip_data *irq_data;
46 struct muic_irq *muic_irqs;
47 unsigned int num_muic_irqs;
48 int irq;
49 bool irq_attach;
50 bool irq_detach;
51 bool irq_ovp;
52 bool irq_otp;
53 struct work_struct irq_work;
54
55 struct reg_data *reg_data;
56 unsigned int num_reg_data;
57 bool auto_config;
58
59 struct mutex mutex;
60
61 /*
62 * Use delayed workqueue to detect cable state and then
63 * notify cable state to notifiee/platform through uevent.
64 * After completing the booting of platform, the extcon provider
65 * driver should notify cable state to upper layer.
66 */
67 struct delayed_work wq_detcable;
68 };
69
70 /* Default value of RT8973A register to bring up MUIC device. */
71 static struct reg_data rt8973a_reg_data[] = {
72 {
73 .reg = RT8973A_REG_CONTROL1,
74 .mask = RT8973A_REG_CONTROL1_ADC_EN_MASK
75 | RT8973A_REG_CONTROL1_USB_CHD_EN_MASK
76 | RT8973A_REG_CONTROL1_CHGTYP_MASK
77 | RT8973A_REG_CONTROL1_SWITCH_OPEN_MASK
78 | RT8973A_REG_CONTROL1_AUTO_CONFIG_MASK
79 | RT8973A_REG_CONTROL1_INTM_MASK,
80 .val = RT8973A_REG_CONTROL1_ADC_EN_MASK
81 | RT8973A_REG_CONTROL1_USB_CHD_EN_MASK
82 | RT8973A_REG_CONTROL1_CHGTYP_MASK,
83 .invert = false,
84 },
85 { /* sentinel */ }
86 };
87
88 /* List of detectable cables */
89 static const unsigned int rt8973a_extcon_cable[] = {
90 EXTCON_USB,
91 EXTCON_USB_HOST,
92 EXTCON_CHG_USB_SDP,
93 EXTCON_CHG_USB_DCP,
94 EXTCON_JIG,
95 EXTCON_NONE,
96 };
97
98 /* Define OVP (Over Voltage Protection), OTP (Over Temperature Protection) */
99 enum rt8973a_event_type {
100 RT8973A_EVENT_ATTACH = 1,
101 RT8973A_EVENT_DETACH,
102 RT8973A_EVENT_OVP,
103 RT8973A_EVENT_OTP,
104 };
105
106 /* Define supported accessory type */
107 enum rt8973a_muic_acc_type {
108 RT8973A_MUIC_ADC_OTG = 0x0,
109 RT8973A_MUIC_ADC_AUDIO_SEND_END_BUTTON,
110 RT8973A_MUIC_ADC_AUDIO_REMOTE_S1_BUTTON,
111 RT8973A_MUIC_ADC_AUDIO_REMOTE_S2_BUTTON,
112 RT8973A_MUIC_ADC_AUDIO_REMOTE_S3_BUTTON,
113 RT8973A_MUIC_ADC_AUDIO_REMOTE_S4_BUTTON,
114 RT8973A_MUIC_ADC_AUDIO_REMOTE_S5_BUTTON,
115 RT8973A_MUIC_ADC_AUDIO_REMOTE_S6_BUTTON,
116 RT8973A_MUIC_ADC_AUDIO_REMOTE_S7_BUTTON,
117 RT8973A_MUIC_ADC_AUDIO_REMOTE_S8_BUTTON,
118 RT8973A_MUIC_ADC_AUDIO_REMOTE_S9_BUTTON,
119 RT8973A_MUIC_ADC_AUDIO_REMOTE_S10_BUTTON,
120 RT8973A_MUIC_ADC_AUDIO_REMOTE_S11_BUTTON,
121 RT8973A_MUIC_ADC_AUDIO_REMOTE_S12_BUTTON,
122 RT8973A_MUIC_ADC_RESERVED_ACC_1,
123 RT8973A_MUIC_ADC_RESERVED_ACC_2,
124 RT8973A_MUIC_ADC_RESERVED_ACC_3,
125 RT8973A_MUIC_ADC_RESERVED_ACC_4,
126 RT8973A_MUIC_ADC_RESERVED_ACC_5,
127 RT8973A_MUIC_ADC_AUDIO_TYPE2,
128 RT8973A_MUIC_ADC_PHONE_POWERED_DEV,
129 RT8973A_MUIC_ADC_UNKNOWN_ACC_1,
130 RT8973A_MUIC_ADC_UNKNOWN_ACC_2,
131 RT8973A_MUIC_ADC_TA,
132 RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB,
133 RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB,
134 RT8973A_MUIC_ADC_UNKNOWN_ACC_3,
135 RT8973A_MUIC_ADC_UNKNOWN_ACC_4,
136 RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART,
137 RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART,
138 RT8973A_MUIC_ADC_UNKNOWN_ACC_5,
139 RT8973A_MUIC_ADC_OPEN = 0x1f,
140
141 /*
142 * The below accessories has same ADC value (0x1f).
143 * So, Device type1 is used to separate specific accessory.
144 */
145 /* |---------|--ADC| */
146 /* | [7:5]|[4:0]| */
147 RT8973A_MUIC_ADC_USB = 0x3f, /* | 001|11111| */
148 };
149
150 /* List of supported interrupt for RT8973A */
151 static struct muic_irq rt8973a_muic_irqs[] = {
152 { RT8973A_INT1_ATTACH, "muic-attach" },
153 { RT8973A_INT1_DETACH, "muic-detach" },
154 { RT8973A_INT1_CHGDET, "muic-chgdet" },
155 { RT8973A_INT1_DCD_T, "muic-dcd-t" },
156 { RT8973A_INT1_OVP, "muic-ovp" },
157 { RT8973A_INT1_CONNECT, "muic-connect" },
158 { RT8973A_INT1_ADC_CHG, "muic-adc-chg" },
159 { RT8973A_INT1_OTP, "muic-otp" },
160 { RT8973A_INT2_UVLO, "muic-uvlo" },
161 { RT8973A_INT2_POR, "muic-por" },
162 { RT8973A_INT2_OTP_FET, "muic-otp-fet" },
163 { RT8973A_INT2_OVP_FET, "muic-ovp-fet" },
164 { RT8973A_INT2_OCP_LATCH, "muic-ocp-latch" },
165 { RT8973A_INT2_OCP, "muic-ocp" },
166 { RT8973A_INT2_OVP_OCP, "muic-ovp-ocp" },
167 };
168
169 /* Define interrupt list of RT8973A to register regmap_irq */
170 static const struct regmap_irq rt8973a_irqs[] = {
171 /* INT1 interrupts */
172 { .reg_offset = 0, .mask = RT8973A_INT1_ATTACH_MASK, },
173 { .reg_offset = 0, .mask = RT8973A_INT1_DETACH_MASK, },
174 { .reg_offset = 0, .mask = RT8973A_INT1_CHGDET_MASK, },
175 { .reg_offset = 0, .mask = RT8973A_INT1_DCD_T_MASK, },
176 { .reg_offset = 0, .mask = RT8973A_INT1_OVP_MASK, },
177 { .reg_offset = 0, .mask = RT8973A_INT1_CONNECT_MASK, },
178 { .reg_offset = 0, .mask = RT8973A_INT1_ADC_CHG_MASK, },
179 { .reg_offset = 0, .mask = RT8973A_INT1_OTP_MASK, },
180
181 /* INT2 interrupts */
182 { .reg_offset = 1, .mask = RT8973A_INT2_UVLOT_MASK,},
183 { .reg_offset = 1, .mask = RT8973A_INT2_POR_MASK, },
184 { .reg_offset = 1, .mask = RT8973A_INT2_OTP_FET_MASK, },
185 { .reg_offset = 1, .mask = RT8973A_INT2_OVP_FET_MASK, },
186 { .reg_offset = 1, .mask = RT8973A_INT2_OCP_LATCH_MASK, },
187 { .reg_offset = 1, .mask = RT8973A_INT2_OCP_MASK, },
188 { .reg_offset = 1, .mask = RT8973A_INT2_OVP_OCP_MASK, },
189 };
190
191 static const struct regmap_irq_chip rt8973a_muic_irq_chip = {
192 .name = "rt8973a",
193 .status_base = RT8973A_REG_INT1,
194 .mask_base = RT8973A_REG_INTM1,
195 .num_regs = 2,
196 .irqs = rt8973a_irqs,
197 .num_irqs = ARRAY_SIZE(rt8973a_irqs),
198 };
199
200 /* Define regmap configuration of RT8973A for I2C communication */
rt8973a_muic_volatile_reg(struct device * dev,unsigned int reg)201 static bool rt8973a_muic_volatile_reg(struct device *dev, unsigned int reg)
202 {
203 switch (reg) {
204 case RT8973A_REG_INTM1:
205 case RT8973A_REG_INTM2:
206 return true;
207 default:
208 break;
209 }
210 return false;
211 }
212
213 static const struct regmap_config rt8973a_muic_regmap_config = {
214 .reg_bits = 8,
215 .val_bits = 8,
216 .volatile_reg = rt8973a_muic_volatile_reg,
217 .max_register = RT8973A_REG_END,
218 };
219
220 /* Change DM_CON/DP_CON/VBUSIN switch according to cable type */
rt8973a_muic_set_path(struct rt8973a_muic_info * info,unsigned int con_sw,bool attached)221 static int rt8973a_muic_set_path(struct rt8973a_muic_info *info,
222 unsigned int con_sw, bool attached)
223 {
224 int ret;
225
226 /*
227 * Don't need to set h/w path according to cable type
228 * if Auto-configuration mode of CONTROL1 register is true.
229 */
230 if (info->auto_config)
231 return 0;
232
233 if (!attached)
234 con_sw = DM_DP_SWITCH_UART;
235
236 switch (con_sw) {
237 case DM_DP_SWITCH_OPEN:
238 case DM_DP_SWITCH_USB:
239 case DM_DP_SWITCH_UART:
240 ret = regmap_update_bits(info->regmap, RT8973A_REG_MANUAL_SW1,
241 RT8973A_REG_MANUAL_SW1_DP_MASK |
242 RT8973A_REG_MANUAL_SW1_DM_MASK,
243 con_sw);
244 if (ret < 0) {
245 dev_err(info->dev,
246 "cannot update DM_CON/DP_CON switch\n");
247 return ret;
248 }
249 break;
250 default:
251 dev_err(info->dev, "Unknown DM_CON/DP_CON switch type (%d)\n",
252 con_sw);
253 return -EINVAL;
254 }
255
256 return 0;
257 }
258
rt8973a_muic_get_cable_type(struct rt8973a_muic_info * info)259 static int rt8973a_muic_get_cable_type(struct rt8973a_muic_info *info)
260 {
261 unsigned int adc, dev1;
262 int ret, cable_type;
263
264 /* Read ADC value according to external cable or button */
265 ret = regmap_read(info->regmap, RT8973A_REG_ADC, &adc);
266 if (ret) {
267 dev_err(info->dev, "failed to read ADC register\n");
268 return ret;
269 }
270 cable_type = adc & RT8973A_REG_ADC_MASK;
271
272 /* Read Device 1 reigster to identify correct cable type */
273 ret = regmap_read(info->regmap, RT8973A_REG_DEV1, &dev1);
274 if (ret) {
275 dev_err(info->dev, "failed to read DEV1 register\n");
276 return ret;
277 }
278
279 switch (adc) {
280 case RT8973A_MUIC_ADC_OPEN:
281 if (dev1 & RT8973A_REG_DEV1_USB_MASK)
282 cable_type = RT8973A_MUIC_ADC_USB;
283 else if (dev1 & RT8973A_REG_DEV1_DCPORT_MASK)
284 cable_type = RT8973A_MUIC_ADC_TA;
285 else
286 cable_type = RT8973A_MUIC_ADC_OPEN;
287 break;
288 default:
289 break;
290 }
291
292 return cable_type;
293 }
294
rt8973a_muic_cable_handler(struct rt8973a_muic_info * info,enum rt8973a_event_type event)295 static int rt8973a_muic_cable_handler(struct rt8973a_muic_info *info,
296 enum rt8973a_event_type event)
297 {
298 static unsigned int prev_cable_type;
299 unsigned int con_sw = DM_DP_SWITCH_UART;
300 int ret, cable_type;
301 unsigned int id;
302 bool attached = false;
303
304 switch (event) {
305 case RT8973A_EVENT_ATTACH:
306 cable_type = rt8973a_muic_get_cable_type(info);
307 attached = true;
308 break;
309 case RT8973A_EVENT_DETACH:
310 cable_type = prev_cable_type;
311 attached = false;
312 break;
313 case RT8973A_EVENT_OVP:
314 case RT8973A_EVENT_OTP:
315 dev_warn(info->dev,
316 "happen Over %s issue. Need to disconnect all cables\n",
317 event == RT8973A_EVENT_OVP ? "Voltage" : "Temperature");
318 cable_type = prev_cable_type;
319 attached = false;
320 break;
321 default:
322 dev_err(info->dev,
323 "Cannot handle this event (event:%d)\n", event);
324 return -EINVAL;
325 }
326 prev_cable_type = cable_type;
327
328 switch (cable_type) {
329 case RT8973A_MUIC_ADC_OTG:
330 id = EXTCON_USB_HOST;
331 con_sw = DM_DP_SWITCH_USB;
332 break;
333 case RT8973A_MUIC_ADC_TA:
334 id = EXTCON_CHG_USB_DCP;
335 con_sw = DM_DP_SWITCH_OPEN;
336 break;
337 case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB:
338 case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB:
339 id = EXTCON_JIG;
340 con_sw = DM_DP_SWITCH_USB;
341 break;
342 case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART:
343 case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART:
344 id = EXTCON_JIG;
345 con_sw = DM_DP_SWITCH_UART;
346 break;
347 case RT8973A_MUIC_ADC_USB:
348 id = EXTCON_USB;
349 con_sw = DM_DP_SWITCH_USB;
350 break;
351 case RT8973A_MUIC_ADC_OPEN:
352 return 0;
353 case RT8973A_MUIC_ADC_UNKNOWN_ACC_1:
354 case RT8973A_MUIC_ADC_UNKNOWN_ACC_2:
355 case RT8973A_MUIC_ADC_UNKNOWN_ACC_3:
356 case RT8973A_MUIC_ADC_UNKNOWN_ACC_4:
357 case RT8973A_MUIC_ADC_UNKNOWN_ACC_5:
358 dev_warn(info->dev,
359 "Unknown accessory type (adc:0x%x)\n", cable_type);
360 return 0;
361 case RT8973A_MUIC_ADC_AUDIO_SEND_END_BUTTON:
362 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S1_BUTTON:
363 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S2_BUTTON:
364 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S3_BUTTON:
365 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S4_BUTTON:
366 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S5_BUTTON:
367 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S6_BUTTON:
368 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S7_BUTTON:
369 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S8_BUTTON:
370 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S9_BUTTON:
371 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S10_BUTTON:
372 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S11_BUTTON:
373 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S12_BUTTON:
374 case RT8973A_MUIC_ADC_AUDIO_TYPE2:
375 dev_warn(info->dev,
376 "Audio device/button type (adc:0x%x)\n", cable_type);
377 return 0;
378 case RT8973A_MUIC_ADC_RESERVED_ACC_1:
379 case RT8973A_MUIC_ADC_RESERVED_ACC_2:
380 case RT8973A_MUIC_ADC_RESERVED_ACC_3:
381 case RT8973A_MUIC_ADC_RESERVED_ACC_4:
382 case RT8973A_MUIC_ADC_RESERVED_ACC_5:
383 case RT8973A_MUIC_ADC_PHONE_POWERED_DEV:
384 return 0;
385 default:
386 dev_err(info->dev,
387 "Cannot handle this cable_type (adc:0x%x)\n",
388 cable_type);
389 return -EINVAL;
390 }
391
392 /* Change internal hardware path(DM_CON/DP_CON) */
393 ret = rt8973a_muic_set_path(info, con_sw, attached);
394 if (ret < 0)
395 return ret;
396
397 /* Change the state of external accessory */
398 extcon_set_state_sync(info->edev, id, attached);
399 if (id == EXTCON_USB)
400 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
401 attached);
402
403 return 0;
404 }
405
rt8973a_muic_irq_work(struct work_struct * work)406 static void rt8973a_muic_irq_work(struct work_struct *work)
407 {
408 struct rt8973a_muic_info *info = container_of(work,
409 struct rt8973a_muic_info, irq_work);
410 int ret = 0;
411
412 if (!info->edev)
413 return;
414
415 mutex_lock(&info->mutex);
416
417 /* Detect attached or detached cables */
418 if (info->irq_attach) {
419 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);
420 info->irq_attach = false;
421 }
422
423 if (info->irq_detach) {
424 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_DETACH);
425 info->irq_detach = false;
426 }
427
428 if (info->irq_ovp) {
429 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OVP);
430 info->irq_ovp = false;
431 }
432
433 if (info->irq_otp) {
434 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OTP);
435 info->irq_otp = false;
436 }
437
438 if (ret < 0)
439 dev_err(info->dev, "failed to handle MUIC interrupt\n");
440
441 mutex_unlock(&info->mutex);
442 }
443
rt8973a_muic_irq_handler(int irq,void * data)444 static irqreturn_t rt8973a_muic_irq_handler(int irq, void *data)
445 {
446 struct rt8973a_muic_info *info = data;
447 int i, irq_type = -1;
448
449 for (i = 0; i < info->num_muic_irqs; i++)
450 if (irq == info->muic_irqs[i].virq)
451 irq_type = info->muic_irqs[i].irq;
452
453 switch (irq_type) {
454 case RT8973A_INT1_ATTACH:
455 info->irq_attach = true;
456 break;
457 case RT8973A_INT1_DETACH:
458 info->irq_detach = true;
459 break;
460 case RT8973A_INT1_OVP:
461 info->irq_ovp = true;
462 break;
463 case RT8973A_INT1_OTP:
464 info->irq_otp = true;
465 break;
466 case RT8973A_INT1_CHGDET:
467 case RT8973A_INT1_DCD_T:
468 case RT8973A_INT1_CONNECT:
469 case RT8973A_INT1_ADC_CHG:
470 case RT8973A_INT2_UVLO:
471 case RT8973A_INT2_POR:
472 case RT8973A_INT2_OTP_FET:
473 case RT8973A_INT2_OVP_FET:
474 case RT8973A_INT2_OCP_LATCH:
475 case RT8973A_INT2_OCP:
476 case RT8973A_INT2_OVP_OCP:
477 default:
478 dev_dbg(info->dev,
479 "Cannot handle this interrupt (%d)\n", irq_type);
480 break;
481 }
482
483 schedule_work(&info->irq_work);
484
485 return IRQ_HANDLED;
486 }
487
rt8973a_muic_detect_cable_wq(struct work_struct * work)488 static void rt8973a_muic_detect_cable_wq(struct work_struct *work)
489 {
490 struct rt8973a_muic_info *info = container_of(to_delayed_work(work),
491 struct rt8973a_muic_info, wq_detcable);
492 int ret;
493
494 /* Notify the state of connector cable or not */
495 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);
496 if (ret < 0)
497 dev_warn(info->dev, "failed to detect cable state\n");
498 }
499
rt8973a_init_dev_type(struct rt8973a_muic_info * info)500 static void rt8973a_init_dev_type(struct rt8973a_muic_info *info)
501 {
502 unsigned int data, vendor_id, version_id;
503 int i, ret;
504
505 /* To test I2C, Print version_id and vendor_id of RT8973A */
506 ret = regmap_read(info->regmap, RT8973A_REG_DEVICE_ID, &data);
507 if (ret) {
508 dev_err(info->dev,
509 "failed to read DEVICE_ID register: %d\n", ret);
510 return;
511 }
512
513 vendor_id = ((data & RT8973A_REG_DEVICE_ID_VENDOR_MASK) >>
514 RT8973A_REG_DEVICE_ID_VENDOR_SHIFT);
515 version_id = ((data & RT8973A_REG_DEVICE_ID_VERSION_MASK) >>
516 RT8973A_REG_DEVICE_ID_VERSION_SHIFT);
517
518 dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
519 version_id, vendor_id);
520
521 /* Initiazle the register of RT8973A device to bring-up */
522 for (i = 0; i < info->num_reg_data; i++) {
523 u8 reg = info->reg_data[i].reg;
524 u8 mask = info->reg_data[i].mask;
525 u8 val = 0;
526
527 if (info->reg_data[i].invert)
528 val = ~info->reg_data[i].val;
529 else
530 val = info->reg_data[i].val;
531
532 regmap_update_bits(info->regmap, reg, mask, val);
533 }
534
535 /* Check whether RT8973A is auto switching mode or not */
536 ret = regmap_read(info->regmap, RT8973A_REG_CONTROL1, &data);
537 if (ret) {
538 dev_err(info->dev,
539 "failed to read CONTROL1 register: %d\n", ret);
540 return;
541 }
542
543 data &= RT8973A_REG_CONTROL1_AUTO_CONFIG_MASK;
544 if (data) {
545 info->auto_config = true;
546 dev_info(info->dev,
547 "Enable Auto-configuration for internal path\n");
548 }
549 }
550
rt8973a_muic_i2c_probe(struct i2c_client * i2c)551 static int rt8973a_muic_i2c_probe(struct i2c_client *i2c)
552 {
553 struct device_node *np = i2c->dev.of_node;
554 struct rt8973a_muic_info *info;
555 int i, ret, irq_flags;
556
557 if (!np)
558 return -EINVAL;
559
560 info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
561 if (!info)
562 return -ENOMEM;
563 i2c_set_clientdata(i2c, info);
564
565 info->dev = &i2c->dev;
566 info->i2c = i2c;
567 info->irq = i2c->irq;
568 info->muic_irqs = rt8973a_muic_irqs;
569 info->num_muic_irqs = ARRAY_SIZE(rt8973a_muic_irqs);
570 info->reg_data = rt8973a_reg_data;
571 info->num_reg_data = ARRAY_SIZE(rt8973a_reg_data);
572
573 mutex_init(&info->mutex);
574
575 INIT_WORK(&info->irq_work, rt8973a_muic_irq_work);
576
577 info->regmap = devm_regmap_init_i2c(i2c, &rt8973a_muic_regmap_config);
578 if (IS_ERR(info->regmap)) {
579 ret = PTR_ERR(info->regmap);
580 dev_err(info->dev, "failed to allocate register map: %d\n",
581 ret);
582 return ret;
583 }
584
585 /* Support irq domain for RT8973A MUIC device */
586 irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED;
587 ret = regmap_add_irq_chip(info->regmap, info->irq, irq_flags, 0,
588 &rt8973a_muic_irq_chip, &info->irq_data);
589 if (ret != 0) {
590 dev_err(info->dev, "failed to add irq_chip (irq:%d, err:%d)\n",
591 info->irq, ret);
592 return ret;
593 }
594
595 for (i = 0; i < info->num_muic_irqs; i++) {
596 struct muic_irq *muic_irq = &info->muic_irqs[i];
597 int virq = 0;
598
599 virq = regmap_irq_get_virq(info->irq_data, muic_irq->irq);
600 if (virq <= 0)
601 return -EINVAL;
602 muic_irq->virq = virq;
603
604 ret = devm_request_threaded_irq(info->dev, virq, NULL,
605 rt8973a_muic_irq_handler,
606 IRQF_NO_SUSPEND | IRQF_ONESHOT,
607 muic_irq->name, info);
608 if (ret) {
609 dev_err(info->dev,
610 "failed: irq request (IRQ: %d, error :%d)\n",
611 muic_irq->irq, ret);
612 return ret;
613 }
614 }
615
616 /* Allocate extcon device */
617 info->edev = devm_extcon_dev_allocate(info->dev, rt8973a_extcon_cable);
618 if (IS_ERR(info->edev)) {
619 dev_err(info->dev, "failed to allocate memory for extcon\n");
620 return -ENOMEM;
621 }
622
623 /* Register extcon device */
624 ret = devm_extcon_dev_register(info->dev, info->edev);
625 if (ret) {
626 dev_err(info->dev, "failed to register extcon device\n");
627 return ret;
628 }
629
630 /*
631 * Detect accessory after completing the initialization of platform
632 *
633 * - Use delayed workqueue to detect cable state and then
634 * notify cable state to notifiee/platform through uevent.
635 * After completing the booting of platform, the extcon provider
636 * driver should notify cable state to upper layer.
637 */
638 INIT_DELAYED_WORK(&info->wq_detcable, rt8973a_muic_detect_cable_wq);
639 queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
640 msecs_to_jiffies(DELAY_MS_DEFAULT));
641
642 /* Initialize RT8973A device and print vendor id and version id */
643 rt8973a_init_dev_type(info);
644
645 return 0;
646 }
647
rt8973a_muic_i2c_remove(struct i2c_client * i2c)648 static void rt8973a_muic_i2c_remove(struct i2c_client *i2c)
649 {
650 struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
651
652 regmap_del_irq_chip(info->irq, info->irq_data);
653 }
654
655 static const struct of_device_id rt8973a_dt_match[] = {
656 { .compatible = "richtek,rt8973a-muic" },
657 { },
658 };
659 MODULE_DEVICE_TABLE(of, rt8973a_dt_match);
660
661 #ifdef CONFIG_PM_SLEEP
rt8973a_muic_suspend(struct device * dev)662 static int rt8973a_muic_suspend(struct device *dev)
663 {
664 struct i2c_client *i2c = to_i2c_client(dev);
665 struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
666
667 enable_irq_wake(info->irq);
668
669 return 0;
670 }
671
rt8973a_muic_resume(struct device * dev)672 static int rt8973a_muic_resume(struct device *dev)
673 {
674 struct i2c_client *i2c = to_i2c_client(dev);
675 struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
676
677 disable_irq_wake(info->irq);
678
679 return 0;
680 }
681 #endif
682
683 static SIMPLE_DEV_PM_OPS(rt8973a_muic_pm_ops,
684 rt8973a_muic_suspend, rt8973a_muic_resume);
685
686 static const struct i2c_device_id rt8973a_i2c_id[] = {
687 { "rt8973a", TYPE_RT8973A },
688 { }
689 };
690 MODULE_DEVICE_TABLE(i2c, rt8973a_i2c_id);
691
692 static struct i2c_driver rt8973a_muic_i2c_driver = {
693 .driver = {
694 .name = "rt8973a",
695 .pm = &rt8973a_muic_pm_ops,
696 .of_match_table = rt8973a_dt_match,
697 },
698 .probe = rt8973a_muic_i2c_probe,
699 .remove = rt8973a_muic_i2c_remove,
700 .id_table = rt8973a_i2c_id,
701 };
702
rt8973a_muic_i2c_init(void)703 static int __init rt8973a_muic_i2c_init(void)
704 {
705 return i2c_add_driver(&rt8973a_muic_i2c_driver);
706 }
707 subsys_initcall(rt8973a_muic_i2c_init);
708
709 MODULE_DESCRIPTION("Richtek RT8973A Extcon driver");
710 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
711 MODULE_LICENSE("GPL");
712