xref: /linux/drivers/extcon/extcon-rt8973a.c (revision e5c86679d5e864947a52fb31e45a425dea3e7fa9)
1 /*
2  * extcon-rt8973a.c - Richtek RT8973A extcon driver to support USB switches
3  *
4  * Copyright (c) 2014 Samsung Electronics Co., Ltd
5  * Author: Chanwoo Choi <cw00.choi@samsung.com>
6  *
7  * This program is free software; you can redistribute  it and/or modify it
8  * under  the terms of  the GNU General  Public License as published by the
9  * Free Software Foundation;  either version 2 of the  License, or (at your
10  * option) any later version.
11  */
12 
13 #include <linux/err.h>
14 #include <linux/i2c.h>
15 #include <linux/input.h>
16 #include <linux/interrupt.h>
17 #include <linux/irqdomain.h>
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/platform_device.h>
21 #include <linux/regmap.h>
22 #include <linux/slab.h>
23 #include <linux/extcon.h>
24 
25 #include "extcon-rt8973a.h"
26 
27 #define	DELAY_MS_DEFAULT		20000	/* unit: millisecond */
28 
29 struct muic_irq {
30 	unsigned int irq;
31 	const char *name;
32 	unsigned int virq;
33 };
34 
35 struct reg_data {
36 	u8 reg;
37 	u8 mask;
38 	u8 val;
39 	bool invert;
40 };
41 
42 struct rt8973a_muic_info {
43 	struct device *dev;
44 	struct extcon_dev *edev;
45 
46 	struct i2c_client *i2c;
47 	struct regmap *regmap;
48 
49 	struct regmap_irq_chip_data *irq_data;
50 	struct muic_irq *muic_irqs;
51 	unsigned int num_muic_irqs;
52 	int irq;
53 	bool irq_attach;
54 	bool irq_detach;
55 	bool irq_ovp;
56 	bool irq_otp;
57 	struct work_struct irq_work;
58 
59 	struct reg_data *reg_data;
60 	unsigned int num_reg_data;
61 	bool auto_config;
62 
63 	struct mutex mutex;
64 
65 	/*
66 	 * Use delayed workqueue to detect cable state and then
67 	 * notify cable state to notifiee/platform through uevent.
68 	 * After completing the booting of platform, the extcon provider
69 	 * driver should notify cable state to upper layer.
70 	 */
71 	struct delayed_work wq_detcable;
72 };
73 
74 /* Default value of RT8973A register to bring up MUIC device. */
75 static struct reg_data rt8973a_reg_data[] = {
76 	{
77 		.reg = RT8973A_REG_CONTROL1,
78 		.mask = RT8973A_REG_CONTROL1_ADC_EN_MASK
79 			| RT8973A_REG_CONTROL1_USB_CHD_EN_MASK
80 			| RT8973A_REG_CONTROL1_CHGTYP_MASK
81 			| RT8973A_REG_CONTROL1_SWITCH_OPEN_MASK
82 			| RT8973A_REG_CONTROL1_AUTO_CONFIG_MASK
83 			| RT8973A_REG_CONTROL1_INTM_MASK,
84 		.val = RT8973A_REG_CONTROL1_ADC_EN_MASK
85 			| RT8973A_REG_CONTROL1_USB_CHD_EN_MASK
86 			| RT8973A_REG_CONTROL1_CHGTYP_MASK,
87 		.invert = false,
88 	},
89 	{ /* sentinel */ }
90 };
91 
92 /* List of detectable cables */
93 static const unsigned int rt8973a_extcon_cable[] = {
94 	EXTCON_USB,
95 	EXTCON_USB_HOST,
96 	EXTCON_CHG_USB_SDP,
97 	EXTCON_CHG_USB_DCP,
98 	EXTCON_JIG,
99 	EXTCON_NONE,
100 };
101 
102 /* Define OVP (Over Voltage Protection), OTP (Over Temperature Protection) */
103 enum rt8973a_event_type {
104 	RT8973A_EVENT_ATTACH = 1,
105 	RT8973A_EVENT_DETACH,
106 	RT8973A_EVENT_OVP,
107 	RT8973A_EVENT_OTP,
108 };
109 
110 /* Define supported accessory type */
111 enum rt8973a_muic_acc_type {
112 	RT8973A_MUIC_ADC_OTG = 0x0,
113 	RT8973A_MUIC_ADC_AUDIO_SEND_END_BUTTON,
114 	RT8973A_MUIC_ADC_AUDIO_REMOTE_S1_BUTTON,
115 	RT8973A_MUIC_ADC_AUDIO_REMOTE_S2_BUTTON,
116 	RT8973A_MUIC_ADC_AUDIO_REMOTE_S3_BUTTON,
117 	RT8973A_MUIC_ADC_AUDIO_REMOTE_S4_BUTTON,
118 	RT8973A_MUIC_ADC_AUDIO_REMOTE_S5_BUTTON,
119 	RT8973A_MUIC_ADC_AUDIO_REMOTE_S6_BUTTON,
120 	RT8973A_MUIC_ADC_AUDIO_REMOTE_S7_BUTTON,
121 	RT8973A_MUIC_ADC_AUDIO_REMOTE_S8_BUTTON,
122 	RT8973A_MUIC_ADC_AUDIO_REMOTE_S9_BUTTON,
123 	RT8973A_MUIC_ADC_AUDIO_REMOTE_S10_BUTTON,
124 	RT8973A_MUIC_ADC_AUDIO_REMOTE_S11_BUTTON,
125 	RT8973A_MUIC_ADC_AUDIO_REMOTE_S12_BUTTON,
126 	RT8973A_MUIC_ADC_RESERVED_ACC_1,
127 	RT8973A_MUIC_ADC_RESERVED_ACC_2,
128 	RT8973A_MUIC_ADC_RESERVED_ACC_3,
129 	RT8973A_MUIC_ADC_RESERVED_ACC_4,
130 	RT8973A_MUIC_ADC_RESERVED_ACC_5,
131 	RT8973A_MUIC_ADC_AUDIO_TYPE2,
132 	RT8973A_MUIC_ADC_PHONE_POWERED_DEV,
133 	RT8973A_MUIC_ADC_UNKNOWN_ACC_1,
134 	RT8973A_MUIC_ADC_UNKNOWN_ACC_2,
135 	RT8973A_MUIC_ADC_TA,
136 	RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB,
137 	RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB,
138 	RT8973A_MUIC_ADC_UNKNOWN_ACC_3,
139 	RT8973A_MUIC_ADC_UNKNOWN_ACC_4,
140 	RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART,
141 	RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART,
142 	RT8973A_MUIC_ADC_UNKNOWN_ACC_5,
143 	RT8973A_MUIC_ADC_OPEN = 0x1f,
144 
145 	/*
146 	 * The below accessories has same ADC value (0x1f).
147 	 * So, Device type1 is used to separate specific accessory.
148 	 */
149 					/* |---------|--ADC| */
150 					/* |    [7:5]|[4:0]| */
151 	RT8973A_MUIC_ADC_USB = 0x3f,	/* |      001|11111| */
152 };
153 
154 /* List of supported interrupt for RT8973A */
155 static struct muic_irq rt8973a_muic_irqs[] = {
156 	{ RT8973A_INT1_ATTACH,		"muic-attach" },
157 	{ RT8973A_INT1_DETACH,		"muic-detach" },
158 	{ RT8973A_INT1_CHGDET,		"muic-chgdet" },
159 	{ RT8973A_INT1_DCD_T,		"muic-dcd-t" },
160 	{ RT8973A_INT1_OVP,		"muic-ovp" },
161 	{ RT8973A_INT1_CONNECT,		"muic-connect" },
162 	{ RT8973A_INT1_ADC_CHG,		"muic-adc-chg" },
163 	{ RT8973A_INT1_OTP,		"muic-otp" },
164 	{ RT8973A_INT2_UVLO,		"muic-uvlo" },
165 	{ RT8973A_INT2_POR,		"muic-por" },
166 	{ RT8973A_INT2_OTP_FET,		"muic-otp-fet" },
167 	{ RT8973A_INT2_OVP_FET,		"muic-ovp-fet" },
168 	{ RT8973A_INT2_OCP_LATCH,	"muic-ocp-latch" },
169 	{ RT8973A_INT2_OCP,		"muic-ocp" },
170 	{ RT8973A_INT2_OVP_OCP,		"muic-ovp-ocp" },
171 };
172 
173 /* Define interrupt list of RT8973A to register regmap_irq */
174 static const struct regmap_irq rt8973a_irqs[] = {
175 	/* INT1 interrupts */
176 	{ .reg_offset = 0, .mask = RT8973A_INT1_ATTACH_MASK, },
177 	{ .reg_offset = 0, .mask = RT8973A_INT1_DETACH_MASK, },
178 	{ .reg_offset = 0, .mask = RT8973A_INT1_CHGDET_MASK, },
179 	{ .reg_offset = 0, .mask = RT8973A_INT1_DCD_T_MASK, },
180 	{ .reg_offset = 0, .mask = RT8973A_INT1_OVP_MASK, },
181 	{ .reg_offset = 0, .mask = RT8973A_INT1_CONNECT_MASK, },
182 	{ .reg_offset = 0, .mask = RT8973A_INT1_ADC_CHG_MASK, },
183 	{ .reg_offset = 0, .mask = RT8973A_INT1_OTP_MASK, },
184 
185 	/* INT2 interrupts */
186 	{ .reg_offset = 1, .mask = RT8973A_INT2_UVLOT_MASK,},
187 	{ .reg_offset = 1, .mask = RT8973A_INT2_POR_MASK, },
188 	{ .reg_offset = 1, .mask = RT8973A_INT2_OTP_FET_MASK, },
189 	{ .reg_offset = 1, .mask = RT8973A_INT2_OVP_FET_MASK, },
190 	{ .reg_offset = 1, .mask = RT8973A_INT2_OCP_LATCH_MASK, },
191 	{ .reg_offset = 1, .mask = RT8973A_INT2_OCP_MASK, },
192 	{ .reg_offset = 1, .mask = RT8973A_INT2_OVP_OCP_MASK, },
193 };
194 
195 static const struct regmap_irq_chip rt8973a_muic_irq_chip = {
196 	.name			= "rt8973a",
197 	.status_base		= RT8973A_REG_INT1,
198 	.mask_base		= RT8973A_REG_INTM1,
199 	.mask_invert		= false,
200 	.num_regs		= 2,
201 	.irqs			= rt8973a_irqs,
202 	.num_irqs		= ARRAY_SIZE(rt8973a_irqs),
203 };
204 
205 /* Define regmap configuration of RT8973A for I2C communication  */
206 static bool rt8973a_muic_volatile_reg(struct device *dev, unsigned int reg)
207 {
208 	switch (reg) {
209 	case RT8973A_REG_INTM1:
210 	case RT8973A_REG_INTM2:
211 		return true;
212 	default:
213 		break;
214 	}
215 	return false;
216 }
217 
218 static const struct regmap_config rt8973a_muic_regmap_config = {
219 	.reg_bits	= 8,
220 	.val_bits	= 8,
221 	.volatile_reg	= rt8973a_muic_volatile_reg,
222 	.max_register	= RT8973A_REG_END,
223 };
224 
225 /* Change DM_CON/DP_CON/VBUSIN switch according to cable type */
226 static int rt8973a_muic_set_path(struct rt8973a_muic_info *info,
227 				unsigned int con_sw, bool attached)
228 {
229 	int ret;
230 
231 	/*
232 	 * Don't need to set h/w path according to cable type
233 	 * if Auto-configuration mode of CONTROL1 register is true.
234 	 */
235 	if (info->auto_config)
236 		return 0;
237 
238 	if (!attached)
239 		con_sw	= DM_DP_SWITCH_UART;
240 
241 	switch (con_sw) {
242 	case DM_DP_SWITCH_OPEN:
243 	case DM_DP_SWITCH_USB:
244 	case DM_DP_SWITCH_UART:
245 		ret = regmap_update_bits(info->regmap, RT8973A_REG_MANUAL_SW1,
246 					RT8973A_REG_MANUAL_SW1_DP_MASK |
247 					RT8973A_REG_MANUAL_SW1_DM_MASK,
248 					con_sw);
249 		if (ret < 0) {
250 			dev_err(info->dev,
251 				"cannot update DM_CON/DP_CON switch\n");
252 			return ret;
253 		}
254 		break;
255 	default:
256 		dev_err(info->dev, "Unknown DM_CON/DP_CON switch type (%d)\n",
257 				con_sw);
258 		return -EINVAL;
259 	}
260 
261 	return 0;
262 }
263 
264 static int rt8973a_muic_get_cable_type(struct rt8973a_muic_info *info)
265 {
266 	unsigned int adc, dev1;
267 	int ret, cable_type;
268 
269 	/* Read ADC value according to external cable or button */
270 	ret = regmap_read(info->regmap, RT8973A_REG_ADC, &adc);
271 	if (ret) {
272 		dev_err(info->dev, "failed to read ADC register\n");
273 		return ret;
274 	}
275 	cable_type = adc & RT8973A_REG_ADC_MASK;
276 
277 	/* Read Device 1 reigster to identify correct cable type */
278 	ret = regmap_read(info->regmap, RT8973A_REG_DEV1, &dev1);
279 	if (ret) {
280 		dev_err(info->dev, "failed to read DEV1 register\n");
281 		return ret;
282 	}
283 
284 	switch (adc) {
285 	case RT8973A_MUIC_ADC_OPEN:
286 		if (dev1 & RT8973A_REG_DEV1_USB_MASK)
287 			cable_type = RT8973A_MUIC_ADC_USB;
288 		else if (dev1 & RT8973A_REG_DEV1_DCPORT_MASK)
289 			cable_type = RT8973A_MUIC_ADC_TA;
290 		else
291 			cable_type = RT8973A_MUIC_ADC_OPEN;
292 		break;
293 	default:
294 		break;
295 	}
296 
297 	return cable_type;
298 }
299 
300 static int rt8973a_muic_cable_handler(struct rt8973a_muic_info *info,
301 					enum rt8973a_event_type event)
302 {
303 	static unsigned int prev_cable_type;
304 	unsigned int con_sw = DM_DP_SWITCH_UART;
305 	int ret, cable_type;
306 	unsigned int id;
307 	bool attached = false;
308 
309 	switch (event) {
310 	case RT8973A_EVENT_ATTACH:
311 		cable_type = rt8973a_muic_get_cable_type(info);
312 		attached = true;
313 		break;
314 	case RT8973A_EVENT_DETACH:
315 		cable_type = prev_cable_type;
316 		attached = false;
317 		break;
318 	case RT8973A_EVENT_OVP:
319 	case RT8973A_EVENT_OTP:
320 		dev_warn(info->dev,
321 			"happen Over %s issue. Need to disconnect all cables\n",
322 			event == RT8973A_EVENT_OVP ? "Voltage" : "Temperature");
323 		cable_type = prev_cable_type;
324 		attached = false;
325 		break;
326 	default:
327 		dev_err(info->dev,
328 			"Cannot handle this event (event:%d)\n", event);
329 		return -EINVAL;
330 	}
331 	prev_cable_type = cable_type;
332 
333 	switch (cable_type) {
334 	case RT8973A_MUIC_ADC_OTG:
335 		id = EXTCON_USB_HOST;
336 		con_sw = DM_DP_SWITCH_USB;
337 		break;
338 	case RT8973A_MUIC_ADC_TA:
339 		id = EXTCON_CHG_USB_DCP;
340 		con_sw = DM_DP_SWITCH_OPEN;
341 		break;
342 	case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB:
343 	case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB:
344 		id = EXTCON_JIG;
345 		con_sw = DM_DP_SWITCH_USB;
346 		break;
347 	case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART:
348 	case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART:
349 		id = EXTCON_JIG;
350 		con_sw = DM_DP_SWITCH_UART;
351 		break;
352 	case RT8973A_MUIC_ADC_USB:
353 		id = EXTCON_USB;
354 		con_sw = DM_DP_SWITCH_USB;
355 		break;
356 	case RT8973A_MUIC_ADC_OPEN:
357 		return 0;
358 	case RT8973A_MUIC_ADC_UNKNOWN_ACC_1:
359 	case RT8973A_MUIC_ADC_UNKNOWN_ACC_2:
360 	case RT8973A_MUIC_ADC_UNKNOWN_ACC_3:
361 	case RT8973A_MUIC_ADC_UNKNOWN_ACC_4:
362 	case RT8973A_MUIC_ADC_UNKNOWN_ACC_5:
363 		dev_warn(info->dev,
364 			"Unknown accessory type (adc:0x%x)\n", cable_type);
365 		return 0;
366 	case RT8973A_MUIC_ADC_AUDIO_SEND_END_BUTTON:
367 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S1_BUTTON:
368 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S2_BUTTON:
369 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S3_BUTTON:
370 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S4_BUTTON:
371 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S5_BUTTON:
372 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S6_BUTTON:
373 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S7_BUTTON:
374 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S8_BUTTON:
375 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S9_BUTTON:
376 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S10_BUTTON:
377 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S11_BUTTON:
378 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S12_BUTTON:
379 	case RT8973A_MUIC_ADC_AUDIO_TYPE2:
380 		dev_warn(info->dev,
381 			"Audio device/button type (adc:0x%x)\n", cable_type);
382 		return 0;
383 	case RT8973A_MUIC_ADC_RESERVED_ACC_1:
384 	case RT8973A_MUIC_ADC_RESERVED_ACC_2:
385 	case RT8973A_MUIC_ADC_RESERVED_ACC_3:
386 	case RT8973A_MUIC_ADC_RESERVED_ACC_4:
387 	case RT8973A_MUIC_ADC_RESERVED_ACC_5:
388 	case RT8973A_MUIC_ADC_PHONE_POWERED_DEV:
389 		return 0;
390 	default:
391 		dev_err(info->dev,
392 			"Cannot handle this cable_type (adc:0x%x)\n",
393 			cable_type);
394 		return -EINVAL;
395 	}
396 
397 	/* Change internal hardware path(DM_CON/DP_CON) */
398 	ret = rt8973a_muic_set_path(info, con_sw, attached);
399 	if (ret < 0)
400 		return ret;
401 
402 	/* Change the state of external accessory */
403 	extcon_set_state_sync(info->edev, id, attached);
404 	if (id == EXTCON_USB)
405 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
406 					attached);
407 
408 	return 0;
409 }
410 
411 static void rt8973a_muic_irq_work(struct work_struct *work)
412 {
413 	struct rt8973a_muic_info *info = container_of(work,
414 			struct rt8973a_muic_info, irq_work);
415 	int ret = 0;
416 
417 	if (!info->edev)
418 		return;
419 
420 	mutex_lock(&info->mutex);
421 
422 	/* Detect attached or detached cables */
423 	if (info->irq_attach) {
424 		ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);
425 		info->irq_attach = false;
426 	}
427 
428 	if (info->irq_detach) {
429 		ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_DETACH);
430 		info->irq_detach = false;
431 	}
432 
433 	if (info->irq_ovp) {
434 		ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OVP);
435 		info->irq_ovp = false;
436 	}
437 
438 	if (info->irq_otp) {
439 		ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OTP);
440 		info->irq_otp = false;
441 	}
442 
443 	if (ret < 0)
444 		dev_err(info->dev, "failed to handle MUIC interrupt\n");
445 
446 	mutex_unlock(&info->mutex);
447 }
448 
449 static irqreturn_t rt8973a_muic_irq_handler(int irq, void *data)
450 {
451 	struct rt8973a_muic_info *info = data;
452 	int i, irq_type = -1;
453 
454 	for (i = 0; i < info->num_muic_irqs; i++)
455 		if (irq == info->muic_irqs[i].virq)
456 			irq_type = info->muic_irqs[i].irq;
457 
458 	switch (irq_type) {
459 	case RT8973A_INT1_ATTACH:
460 		info->irq_attach = true;
461 		break;
462 	case RT8973A_INT1_DETACH:
463 		info->irq_detach = true;
464 		break;
465 	case RT8973A_INT1_OVP:
466 		info->irq_ovp = true;
467 		break;
468 	case RT8973A_INT1_OTP:
469 		info->irq_otp = true;
470 		break;
471 	case RT8973A_INT1_CHGDET:
472 	case RT8973A_INT1_DCD_T:
473 	case RT8973A_INT1_CONNECT:
474 	case RT8973A_INT1_ADC_CHG:
475 	case RT8973A_INT2_UVLO:
476 	case RT8973A_INT2_POR:
477 	case RT8973A_INT2_OTP_FET:
478 	case RT8973A_INT2_OVP_FET:
479 	case RT8973A_INT2_OCP_LATCH:
480 	case RT8973A_INT2_OCP:
481 	case RT8973A_INT2_OVP_OCP:
482 	default:
483 		dev_dbg(info->dev,
484 			"Cannot handle this interrupt (%d)\n", irq_type);
485 		break;
486 	}
487 
488 	schedule_work(&info->irq_work);
489 
490 	return IRQ_HANDLED;
491 }
492 
493 static void rt8973a_muic_detect_cable_wq(struct work_struct *work)
494 {
495 	struct rt8973a_muic_info *info = container_of(to_delayed_work(work),
496 				struct rt8973a_muic_info, wq_detcable);
497 	int ret;
498 
499 	/* Notify the state of connector cable or not  */
500 	ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);
501 	if (ret < 0)
502 		dev_warn(info->dev, "failed to detect cable state\n");
503 }
504 
505 static void rt8973a_init_dev_type(struct rt8973a_muic_info *info)
506 {
507 	unsigned int data, vendor_id, version_id;
508 	int i, ret;
509 
510 	/* To test I2C, Print version_id and vendor_id of RT8973A */
511 	ret = regmap_read(info->regmap, RT8973A_REG_DEVICE_ID, &data);
512 	if (ret) {
513 		dev_err(info->dev,
514 			"failed to read DEVICE_ID register: %d\n", ret);
515 		return;
516 	}
517 
518 	vendor_id = ((data & RT8973A_REG_DEVICE_ID_VENDOR_MASK) >>
519 				RT8973A_REG_DEVICE_ID_VENDOR_SHIFT);
520 	version_id = ((data & RT8973A_REG_DEVICE_ID_VERSION_MASK) >>
521 				RT8973A_REG_DEVICE_ID_VERSION_SHIFT);
522 
523 	dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
524 			    version_id, vendor_id);
525 
526 	/* Initiazle the register of RT8973A device to bring-up */
527 	for (i = 0; i < info->num_reg_data; i++) {
528 		u8 reg = info->reg_data[i].reg;
529 		u8 mask = info->reg_data[i].mask;
530 		u8 val = 0;
531 
532 		if (info->reg_data[i].invert)
533 			val = ~info->reg_data[i].val;
534 		else
535 			val = info->reg_data[i].val;
536 
537 		regmap_update_bits(info->regmap, reg, mask, val);
538 	}
539 
540 	/* Check whether RT8973A is auto switching mode or not */
541 	ret = regmap_read(info->regmap, RT8973A_REG_CONTROL1, &data);
542 	if (ret) {
543 		dev_err(info->dev,
544 			"failed to read CONTROL1 register: %d\n", ret);
545 		return;
546 	}
547 
548 	data &= RT8973A_REG_CONTROL1_AUTO_CONFIG_MASK;
549 	if (data) {
550 		info->auto_config = true;
551 		dev_info(info->dev,
552 			"Enable Auto-configuration for internal path\n");
553 	}
554 }
555 
556 static int rt8973a_muic_i2c_probe(struct i2c_client *i2c,
557 				 const struct i2c_device_id *id)
558 {
559 	struct device_node *np = i2c->dev.of_node;
560 	struct rt8973a_muic_info *info;
561 	int i, ret, irq_flags;
562 
563 	if (!np)
564 		return -EINVAL;
565 
566 	info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
567 	if (!info)
568 		return -ENOMEM;
569 	i2c_set_clientdata(i2c, info);
570 
571 	info->dev = &i2c->dev;
572 	info->i2c = i2c;
573 	info->irq = i2c->irq;
574 	info->muic_irqs = rt8973a_muic_irqs;
575 	info->num_muic_irqs = ARRAY_SIZE(rt8973a_muic_irqs);
576 	info->reg_data = rt8973a_reg_data;
577 	info->num_reg_data = ARRAY_SIZE(rt8973a_reg_data);
578 
579 	mutex_init(&info->mutex);
580 
581 	INIT_WORK(&info->irq_work, rt8973a_muic_irq_work);
582 
583 	info->regmap = devm_regmap_init_i2c(i2c, &rt8973a_muic_regmap_config);
584 	if (IS_ERR(info->regmap)) {
585 		ret = PTR_ERR(info->regmap);
586 		dev_err(info->dev, "failed to allocate register map: %d\n",
587 				   ret);
588 		return ret;
589 	}
590 
591 	/* Support irq domain for RT8973A MUIC device */
592 	irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED;
593 	ret = regmap_add_irq_chip(info->regmap, info->irq, irq_flags, 0,
594 				  &rt8973a_muic_irq_chip, &info->irq_data);
595 	if (ret != 0) {
596 		dev_err(info->dev, "failed to add irq_chip (irq:%d, err:%d)\n",
597 				    info->irq, ret);
598 		return ret;
599 	}
600 
601 	for (i = 0; i < info->num_muic_irqs; i++) {
602 		struct muic_irq *muic_irq = &info->muic_irqs[i];
603 		int virq = 0;
604 
605 		virq = regmap_irq_get_virq(info->irq_data, muic_irq->irq);
606 		if (virq <= 0)
607 			return -EINVAL;
608 		muic_irq->virq = virq;
609 
610 		ret = devm_request_threaded_irq(info->dev, virq, NULL,
611 						rt8973a_muic_irq_handler,
612 						IRQF_NO_SUSPEND | IRQF_ONESHOT,
613 						muic_irq->name, info);
614 		if (ret) {
615 			dev_err(info->dev,
616 				"failed: irq request (IRQ: %d, error :%d)\n",
617 				muic_irq->irq, ret);
618 			return ret;
619 		}
620 	}
621 
622 	/* Allocate extcon device */
623 	info->edev = devm_extcon_dev_allocate(info->dev, rt8973a_extcon_cable);
624 	if (IS_ERR(info->edev)) {
625 		dev_err(info->dev, "failed to allocate memory for extcon\n");
626 		return -ENOMEM;
627 	}
628 
629 	/* Register extcon device */
630 	ret = devm_extcon_dev_register(info->dev, info->edev);
631 	if (ret) {
632 		dev_err(info->dev, "failed to register extcon device\n");
633 		return ret;
634 	}
635 
636 	/*
637 	 * Detect accessory after completing the initialization of platform
638 	 *
639 	 * - Use delayed workqueue to detect cable state and then
640 	 * notify cable state to notifiee/platform through uevent.
641 	 * After completing the booting of platform, the extcon provider
642 	 * driver should notify cable state to upper layer.
643 	 */
644 	INIT_DELAYED_WORK(&info->wq_detcable, rt8973a_muic_detect_cable_wq);
645 	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
646 			msecs_to_jiffies(DELAY_MS_DEFAULT));
647 
648 	/* Initialize RT8973A device and print vendor id and version id */
649 	rt8973a_init_dev_type(info);
650 
651 	return 0;
652 }
653 
654 static int rt8973a_muic_i2c_remove(struct i2c_client *i2c)
655 {
656 	struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
657 
658 	regmap_del_irq_chip(info->irq, info->irq_data);
659 
660 	return 0;
661 }
662 
663 static const struct of_device_id rt8973a_dt_match[] = {
664 	{ .compatible = "richtek,rt8973a-muic" },
665 	{ },
666 };
667 MODULE_DEVICE_TABLE(of, rt8973a_dt_match);
668 
669 #ifdef CONFIG_PM_SLEEP
670 static int rt8973a_muic_suspend(struct device *dev)
671 {
672 	struct i2c_client *i2c = to_i2c_client(dev);
673 	struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
674 
675 	enable_irq_wake(info->irq);
676 
677 	return 0;
678 }
679 
680 static int rt8973a_muic_resume(struct device *dev)
681 {
682 	struct i2c_client *i2c = to_i2c_client(dev);
683 	struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
684 
685 	disable_irq_wake(info->irq);
686 
687 	return 0;
688 }
689 #endif
690 
691 static SIMPLE_DEV_PM_OPS(rt8973a_muic_pm_ops,
692 			 rt8973a_muic_suspend, rt8973a_muic_resume);
693 
694 static const struct i2c_device_id rt8973a_i2c_id[] = {
695 	{ "rt8973a", TYPE_RT8973A },
696 	{ }
697 };
698 MODULE_DEVICE_TABLE(i2c, rt8973a_i2c_id);
699 
700 static struct i2c_driver rt8973a_muic_i2c_driver = {
701 	.driver		= {
702 		.name	= "rt8973a",
703 		.pm	= &rt8973a_muic_pm_ops,
704 		.of_match_table = rt8973a_dt_match,
705 	},
706 	.probe	= rt8973a_muic_i2c_probe,
707 	.remove	= rt8973a_muic_i2c_remove,
708 	.id_table = rt8973a_i2c_id,
709 };
710 
711 static int __init rt8973a_muic_i2c_init(void)
712 {
713 	return i2c_add_driver(&rt8973a_muic_i2c_driver);
714 }
715 subsys_initcall(rt8973a_muic_i2c_init);
716 
717 MODULE_DESCRIPTION("Richtek RT8973A Extcon driver");
718 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
719 MODULE_LICENSE("GPL");
720