1 /*
2  * extcon-sm5502.c - Silicon Mitus SM5502 extcon drvier 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/interrupt.h>
16 #include <linux/irqdomain.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/regmap.h>
21 #include <linux/slab.h>
22 #include <linux/extcon.h>
23 
24 #include "extcon-sm5502.h"
25 
26 #define	DELAY_MS_DEFAULT		17000	/* unit: millisecond */
27 
28 struct muic_irq {
29 	unsigned int irq;
30 	const char *name;
31 	unsigned int virq;
32 };
33 
34 struct reg_data {
35 	u8 reg;
36 	unsigned int val;
37 	bool invert;
38 };
39 
40 struct sm5502_muic_info {
41 	struct device *dev;
42 	struct extcon_dev *edev;
43 
44 	struct i2c_client *i2c;
45 	struct regmap *regmap;
46 
47 	struct regmap_irq_chip_data *irq_data;
48 	struct muic_irq *muic_irqs;
49 	unsigned int num_muic_irqs;
50 	int irq;
51 	bool irq_attach;
52 	bool irq_detach;
53 	struct work_struct irq_work;
54 
55 	struct reg_data *reg_data;
56 	unsigned int num_reg_data;
57 
58 	struct mutex mutex;
59 
60 	/*
61 	 * Use delayed workqueue to detect cable state and then
62 	 * notify cable state to notifiee/platform through uevent.
63 	 * After completing the booting of platform, the extcon provider
64 	 * driver should notify cable state to upper layer.
65 	 */
66 	struct delayed_work wq_detcable;
67 };
68 
69 /* Default value of SM5502 register to bring up MUIC device. */
70 static struct reg_data sm5502_reg_data[] = {
71 	{
72 		.reg = SM5502_REG_CONTROL,
73 		.val = SM5502_REG_CONTROL_MASK_INT_MASK,
74 		.invert = false,
75 	}, {
76 		.reg = SM5502_REG_INTMASK1,
77 		.val = SM5502_REG_INTM1_KP_MASK
78 			| SM5502_REG_INTM1_LKP_MASK
79 			| SM5502_REG_INTM1_LKR_MASK,
80 		.invert = true,
81 	}, {
82 		.reg = SM5502_REG_INTMASK2,
83 		.val = SM5502_REG_INTM2_VBUS_DET_MASK
84 			| SM5502_REG_INTM2_REV_ACCE_MASK
85 			| SM5502_REG_INTM2_ADC_CHG_MASK
86 			| SM5502_REG_INTM2_STUCK_KEY_MASK
87 			| SM5502_REG_INTM2_STUCK_KEY_RCV_MASK
88 			| SM5502_REG_INTM2_MHL_MASK,
89 		.invert = true,
90 	},
91 	{ }
92 };
93 
94 /* List of detectable cables */
95 enum {
96 	EXTCON_CABLE_USB = 0,
97 	EXTCON_CABLE_USB_HOST,
98 	EXTCON_CABLE_TA,
99 
100 	EXTCON_CABLE_END,
101 };
102 
103 static const char *sm5502_extcon_cable[] = {
104 	[EXTCON_CABLE_USB]	= "USB",
105 	[EXTCON_CABLE_USB_HOST]	= "USB-Host",
106 	[EXTCON_CABLE_TA]	= "TA",
107 	NULL,
108 };
109 
110 /* Define supported accessory type */
111 enum sm5502_muic_acc_type {
112 	SM5502_MUIC_ADC_GROUND = 0x0,
113 	SM5502_MUIC_ADC_SEND_END_BUTTON,
114 	SM5502_MUIC_ADC_REMOTE_S1_BUTTON,
115 	SM5502_MUIC_ADC_REMOTE_S2_BUTTON,
116 	SM5502_MUIC_ADC_REMOTE_S3_BUTTON,
117 	SM5502_MUIC_ADC_REMOTE_S4_BUTTON,
118 	SM5502_MUIC_ADC_REMOTE_S5_BUTTON,
119 	SM5502_MUIC_ADC_REMOTE_S6_BUTTON,
120 	SM5502_MUIC_ADC_REMOTE_S7_BUTTON,
121 	SM5502_MUIC_ADC_REMOTE_S8_BUTTON,
122 	SM5502_MUIC_ADC_REMOTE_S9_BUTTON,
123 	SM5502_MUIC_ADC_REMOTE_S10_BUTTON,
124 	SM5502_MUIC_ADC_REMOTE_S11_BUTTON,
125 	SM5502_MUIC_ADC_REMOTE_S12_BUTTON,
126 	SM5502_MUIC_ADC_RESERVED_ACC_1,
127 	SM5502_MUIC_ADC_RESERVED_ACC_2,
128 	SM5502_MUIC_ADC_RESERVED_ACC_3,
129 	SM5502_MUIC_ADC_RESERVED_ACC_4,
130 	SM5502_MUIC_ADC_RESERVED_ACC_5,
131 	SM5502_MUIC_ADC_AUDIO_TYPE2,
132 	SM5502_MUIC_ADC_PHONE_POWERED_DEV,
133 	SM5502_MUIC_ADC_TTY_CONVERTER,
134 	SM5502_MUIC_ADC_UART_CABLE,
135 	SM5502_MUIC_ADC_TYPE1_CHARGER,
136 	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB,
137 	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB,
138 	SM5502_MUIC_ADC_AUDIO_VIDEO_CABLE,
139 	SM5502_MUIC_ADC_TYPE2_CHARGER,
140 	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART,
141 	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART,
142 	SM5502_MUIC_ADC_AUDIO_TYPE1,
143 	SM5502_MUIC_ADC_OPEN = 0x1f,
144 
145 	/* The below accessories have same ADC value (0x1f or 0x1e).
146 	   So, Device type1 is used to separate specific accessory. */
147 							/* |---------|--ADC| */
148 							/* |    [7:5]|[4:0]| */
149 	SM5502_MUIC_ADC_AUDIO_TYPE1_FULL_REMOTE = 0x3e,	/* |      001|11110| */
150 	SM5502_MUIC_ADC_AUDIO_TYPE1_SEND_END = 0x5e,	/* |      010|11110| */
151 							/* |Dev Type1|--ADC| */
152 	SM5502_MUIC_ADC_OPEN_USB = 0x5f,		/* |      010|11111| */
153 	SM5502_MUIC_ADC_OPEN_TA = 0xdf,			/* |      110|11111| */
154 	SM5502_MUIC_ADC_OPEN_USB_OTG = 0xff,		/* |      111|11111| */
155 };
156 
157 /* List of supported interrupt for SM5502 */
158 static struct muic_irq sm5502_muic_irqs[] = {
159 	{ SM5502_IRQ_INT1_ATTACH,	"muic-attach" },
160 	{ SM5502_IRQ_INT1_DETACH,	"muic-detach" },
161 	{ SM5502_IRQ_INT1_KP,		"muic-kp" },
162 	{ SM5502_IRQ_INT1_LKP,		"muic-lkp" },
163 	{ SM5502_IRQ_INT1_LKR,		"muic-lkr" },
164 	{ SM5502_IRQ_INT1_OVP_EVENT,	"muic-ovp-event" },
165 	{ SM5502_IRQ_INT1_OCP_EVENT,	"muic-ocp-event" },
166 	{ SM5502_IRQ_INT1_OVP_OCP_DIS,	"muic-ovp-ocp-dis" },
167 	{ SM5502_IRQ_INT2_VBUS_DET,	"muic-vbus-det" },
168 	{ SM5502_IRQ_INT2_REV_ACCE,	"muic-rev-acce" },
169 	{ SM5502_IRQ_INT2_ADC_CHG,	"muic-adc-chg" },
170 	{ SM5502_IRQ_INT2_STUCK_KEY,	"muic-stuck-key" },
171 	{ SM5502_IRQ_INT2_STUCK_KEY_RCV, "muic-stuck-key-rcv" },
172 	{ SM5502_IRQ_INT2_MHL,		"muic-mhl" },
173 };
174 
175 /* Define interrupt list of SM5502 to register regmap_irq */
176 static const struct regmap_irq sm5502_irqs[] = {
177 	/* INT1 interrupts */
178 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_ATTACH_MASK, },
179 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_DETACH_MASK, },
180 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_KP_MASK, },
181 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_LKP_MASK, },
182 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_LKR_MASK, },
183 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_OVP_EVENT_MASK, },
184 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_OCP_EVENT_MASK, },
185 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_OVP_OCP_DIS_MASK, },
186 
187 	/* INT2 interrupts */
188 	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_VBUS_DET_MASK,},
189 	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_REV_ACCE_MASK, },
190 	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_ADC_CHG_MASK, },
191 	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_STUCK_KEY_MASK, },
192 	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_STUCK_KEY_RCV_MASK, },
193 	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_MHL_MASK, },
194 };
195 
196 static const struct regmap_irq_chip sm5502_muic_irq_chip = {
197 	.name			= "sm5502",
198 	.status_base		= SM5502_REG_INT1,
199 	.mask_base		= SM5502_REG_INTMASK1,
200 	.mask_invert		= false,
201 	.num_regs		= 2,
202 	.irqs			= sm5502_irqs,
203 	.num_irqs		= ARRAY_SIZE(sm5502_irqs),
204 };
205 
206 /* Define regmap configuration of SM5502 for I2C communication  */
207 static bool sm5502_muic_volatile_reg(struct device *dev, unsigned int reg)
208 {
209 	switch (reg) {
210 	case SM5502_REG_INTMASK1:
211 	case SM5502_REG_INTMASK2:
212 		return true;
213 	default:
214 		break;
215 	}
216 	return false;
217 }
218 
219 static const struct regmap_config sm5502_muic_regmap_config = {
220 	.reg_bits	= 8,
221 	.val_bits	= 8,
222 	.volatile_reg	= sm5502_muic_volatile_reg,
223 	.max_register	= SM5502_REG_END,
224 };
225 
226 /* Change DM_CON/DP_CON/VBUSIN switch according to cable type */
227 static int sm5502_muic_set_path(struct sm5502_muic_info *info,
228 				unsigned int con_sw, unsigned int vbus_sw,
229 				bool attached)
230 {
231 	int ret;
232 
233 	if (!attached) {
234 		con_sw	= DM_DP_SWITCH_OPEN;
235 		vbus_sw	= VBUSIN_SWITCH_OPEN;
236 	}
237 
238 	switch (con_sw) {
239 	case DM_DP_SWITCH_OPEN:
240 	case DM_DP_SWITCH_USB:
241 	case DM_DP_SWITCH_AUDIO:
242 	case DM_DP_SWITCH_UART:
243 		ret = regmap_update_bits(info->regmap, SM5502_REG_MANUAL_SW1,
244 					 SM5502_REG_MANUAL_SW1_DP_MASK |
245 					 SM5502_REG_MANUAL_SW1_DM_MASK,
246 					 con_sw);
247 		if (ret < 0) {
248 			dev_err(info->dev,
249 				"cannot update DM_CON/DP_CON switch\n");
250 			return ret;
251 		}
252 		break;
253 	default:
254 		dev_err(info->dev, "Unknown DM_CON/DP_CON switch type (%d)\n",
255 				con_sw);
256 		return -EINVAL;
257 	};
258 
259 	switch (vbus_sw) {
260 	case VBUSIN_SWITCH_OPEN:
261 	case VBUSIN_SWITCH_VBUSOUT:
262 	case VBUSIN_SWITCH_MIC:
263 	case VBUSIN_SWITCH_VBUSOUT_WITH_USB:
264 		ret = regmap_update_bits(info->regmap, SM5502_REG_MANUAL_SW1,
265 					 SM5502_REG_MANUAL_SW1_VBUSIN_MASK,
266 					 vbus_sw);
267 		if (ret < 0) {
268 			dev_err(info->dev,
269 				"cannot update VBUSIN switch\n");
270 			return ret;
271 		}
272 		break;
273 	default:
274 		dev_err(info->dev, "Unknown VBUS switch type (%d)\n", vbus_sw);
275 		return -EINVAL;
276 	};
277 
278 	return 0;
279 }
280 
281 /* Return cable type of attached or detached accessories */
282 static unsigned int sm5502_muic_get_cable_type(struct sm5502_muic_info *info)
283 {
284 	unsigned int cable_type = -1, adc, dev_type1;
285 	int ret;
286 
287 	/* Read ADC value according to external cable or button */
288 	ret = regmap_read(info->regmap, SM5502_REG_ADC, &adc);
289 	if (ret) {
290 		dev_err(info->dev, "failed to read ADC register\n");
291 		return ret;
292 	}
293 
294 	/*
295 	 * If ADC is SM5502_MUIC_ADC_GROUND(0x0), external cable hasn't
296 	 * connected with to MUIC device.
297 	 */
298 	cable_type = adc & SM5502_REG_ADC_MASK;
299 	if (cable_type == SM5502_MUIC_ADC_GROUND)
300 		return SM5502_MUIC_ADC_GROUND;
301 
302 	switch (cable_type) {
303 	case SM5502_MUIC_ADC_GROUND:
304 	case SM5502_MUIC_ADC_SEND_END_BUTTON:
305 	case SM5502_MUIC_ADC_REMOTE_S1_BUTTON:
306 	case SM5502_MUIC_ADC_REMOTE_S2_BUTTON:
307 	case SM5502_MUIC_ADC_REMOTE_S3_BUTTON:
308 	case SM5502_MUIC_ADC_REMOTE_S4_BUTTON:
309 	case SM5502_MUIC_ADC_REMOTE_S5_BUTTON:
310 	case SM5502_MUIC_ADC_REMOTE_S6_BUTTON:
311 	case SM5502_MUIC_ADC_REMOTE_S7_BUTTON:
312 	case SM5502_MUIC_ADC_REMOTE_S8_BUTTON:
313 	case SM5502_MUIC_ADC_REMOTE_S9_BUTTON:
314 	case SM5502_MUIC_ADC_REMOTE_S10_BUTTON:
315 	case SM5502_MUIC_ADC_REMOTE_S11_BUTTON:
316 	case SM5502_MUIC_ADC_REMOTE_S12_BUTTON:
317 	case SM5502_MUIC_ADC_RESERVED_ACC_1:
318 	case SM5502_MUIC_ADC_RESERVED_ACC_2:
319 	case SM5502_MUIC_ADC_RESERVED_ACC_3:
320 	case SM5502_MUIC_ADC_RESERVED_ACC_4:
321 	case SM5502_MUIC_ADC_RESERVED_ACC_5:
322 	case SM5502_MUIC_ADC_AUDIO_TYPE2:
323 	case SM5502_MUIC_ADC_PHONE_POWERED_DEV:
324 	case SM5502_MUIC_ADC_TTY_CONVERTER:
325 	case SM5502_MUIC_ADC_UART_CABLE:
326 	case SM5502_MUIC_ADC_TYPE1_CHARGER:
327 	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB:
328 	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB:
329 	case SM5502_MUIC_ADC_AUDIO_VIDEO_CABLE:
330 	case SM5502_MUIC_ADC_TYPE2_CHARGER:
331 	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART:
332 	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART:
333 		break;
334 	case SM5502_MUIC_ADC_AUDIO_TYPE1:
335 		/*
336 		 * Check whether cable type is
337 		 * SM5502_MUIC_ADC_AUDIO_TYPE1_FULL_REMOTE
338 		 * or SM5502_MUIC_ADC_AUDIO_TYPE1_SEND_END
339 		 * by using Button event.
340 		 */
341 		break;
342 	case SM5502_MUIC_ADC_OPEN:
343 		ret = regmap_read(info->regmap, SM5502_REG_DEV_TYPE1,
344 				  &dev_type1);
345 		if (ret) {
346 			dev_err(info->dev, "failed to read DEV_TYPE1 reg\n");
347 			return ret;
348 		}
349 
350 		switch (dev_type1) {
351 		case SM5502_REG_DEV_TYPE1_USB_SDP_MASK:
352 			cable_type = SM5502_MUIC_ADC_OPEN_USB;
353 			break;
354 		case SM5502_REG_DEV_TYPE1_DEDICATED_CHG_MASK:
355 			cable_type = SM5502_MUIC_ADC_OPEN_TA;
356 			break;
357 		case SM5502_REG_DEV_TYPE1_USB_OTG_MASK:
358 			cable_type = SM5502_MUIC_ADC_OPEN_USB_OTG;
359 			break;
360 		default:
361 			dev_dbg(info->dev,
362 				"cannot identify the cable type: adc(0x%x) "
363 				"dev_type1(0x%x)\n", adc, dev_type1);
364 			return -EINVAL;
365 		};
366 		break;
367 	default:
368 		dev_err(info->dev,
369 			"failed to identify the cable type: adc(0x%x)\n", adc);
370 		return -EINVAL;
371 	};
372 
373 	return cable_type;
374 }
375 
376 static int sm5502_muic_cable_handler(struct sm5502_muic_info *info,
377 				     bool attached)
378 {
379 	static unsigned int prev_cable_type = SM5502_MUIC_ADC_GROUND;
380 	const char **cable_names = info->edev->supported_cable;
381 	unsigned int cable_type = SM5502_MUIC_ADC_GROUND;
382 	unsigned int con_sw = DM_DP_SWITCH_OPEN;
383 	unsigned int vbus_sw = VBUSIN_SWITCH_OPEN;
384 	unsigned int idx = 0;
385 	int ret;
386 
387 	if (!cable_names)
388 		return 0;
389 
390 	/* Get the type of attached or detached cable */
391 	if (attached)
392 		cable_type = sm5502_muic_get_cable_type(info);
393 	else
394 		cable_type = prev_cable_type;
395 	prev_cable_type = cable_type;
396 
397 	switch (cable_type) {
398 	case SM5502_MUIC_ADC_OPEN_USB:
399 		idx	= EXTCON_CABLE_USB;
400 		con_sw	= DM_DP_SWITCH_USB;
401 		vbus_sw	= VBUSIN_SWITCH_VBUSOUT_WITH_USB;
402 		break;
403 	case SM5502_MUIC_ADC_OPEN_TA:
404 		idx	= EXTCON_CABLE_TA;
405 		con_sw	= DM_DP_SWITCH_OPEN;
406 		vbus_sw	= VBUSIN_SWITCH_VBUSOUT;
407 		break;
408 	case SM5502_MUIC_ADC_OPEN_USB_OTG:
409 		idx	= EXTCON_CABLE_USB_HOST;
410 		con_sw	= DM_DP_SWITCH_USB;
411 		vbus_sw	= VBUSIN_SWITCH_OPEN;
412 		break;
413 	default:
414 		dev_dbg(info->dev,
415 			"cannot handle this cable_type (0x%x)\n", cable_type);
416 		return 0;
417 	};
418 
419 	/* Change internal hardware path(DM_CON/DP_CON, VBUSIN) */
420 	ret = sm5502_muic_set_path(info, con_sw, vbus_sw, attached);
421 	if (ret < 0)
422 		return ret;
423 
424 	/* Change the state of external accessory */
425 	extcon_set_cable_state(info->edev, cable_names[idx], attached);
426 
427 	return 0;
428 }
429 
430 static void sm5502_muic_irq_work(struct work_struct *work)
431 {
432 	struct sm5502_muic_info *info = container_of(work,
433 			struct sm5502_muic_info, irq_work);
434 	int ret = 0;
435 
436 	if (!info->edev)
437 		return;
438 
439 	mutex_lock(&info->mutex);
440 
441 	/* Detect attached or detached cables */
442 	if (info->irq_attach) {
443 		ret = sm5502_muic_cable_handler(info, true);
444 		info->irq_attach = false;
445 	}
446 	if (info->irq_detach) {
447 		ret = sm5502_muic_cable_handler(info, false);
448 		info->irq_detach = false;
449 	}
450 
451 	if (ret < 0)
452 		dev_err(info->dev, "failed to handle MUIC interrupt\n");
453 
454 	mutex_unlock(&info->mutex);
455 }
456 
457 /*
458  * Sets irq_attach or irq_detach in sm5502_muic_info and returns 0.
459  * Returns -ESRCH if irq_type does not match registered IRQ for this dev type.
460  */
461 static int sm5502_parse_irq(struct sm5502_muic_info *info, int irq_type)
462 {
463 	switch (irq_type) {
464 	case SM5502_IRQ_INT1_ATTACH:
465 		info->irq_attach = true;
466 		break;
467 	case SM5502_IRQ_INT1_DETACH:
468 		info->irq_detach = true;
469 		break;
470 	case SM5502_IRQ_INT1_KP:
471 	case SM5502_IRQ_INT1_LKP:
472 	case SM5502_IRQ_INT1_LKR:
473 	case SM5502_IRQ_INT1_OVP_EVENT:
474 	case SM5502_IRQ_INT1_OCP_EVENT:
475 	case SM5502_IRQ_INT1_OVP_OCP_DIS:
476 	case SM5502_IRQ_INT2_VBUS_DET:
477 	case SM5502_IRQ_INT2_REV_ACCE:
478 	case SM5502_IRQ_INT2_ADC_CHG:
479 	case SM5502_IRQ_INT2_STUCK_KEY:
480 	case SM5502_IRQ_INT2_STUCK_KEY_RCV:
481 	case SM5502_IRQ_INT2_MHL:
482 	default:
483 		break;
484 	}
485 
486 	return 0;
487 }
488 
489 static irqreturn_t sm5502_muic_irq_handler(int irq, void *data)
490 {
491 	struct sm5502_muic_info *info = data;
492 	int i, irq_type = -1, ret;
493 
494 	for (i = 0; i < info->num_muic_irqs; i++)
495 		if (irq == info->muic_irqs[i].virq)
496 			irq_type = info->muic_irqs[i].irq;
497 
498 	ret = sm5502_parse_irq(info, irq_type);
499 	if (ret < 0) {
500 		dev_warn(info->dev, "cannot handle is interrupt:%d\n",
501 				    irq_type);
502 		return IRQ_HANDLED;
503 	}
504 	schedule_work(&info->irq_work);
505 
506 	return IRQ_HANDLED;
507 }
508 
509 static void sm5502_muic_detect_cable_wq(struct work_struct *work)
510 {
511 	struct sm5502_muic_info *info = container_of(to_delayed_work(work),
512 				struct sm5502_muic_info, wq_detcable);
513 	int ret;
514 
515 	/* Notify the state of connector cable or not  */
516 	ret = sm5502_muic_cable_handler(info, true);
517 	if (ret < 0)
518 		dev_warn(info->dev, "failed to detect cable state\n");
519 }
520 
521 static void sm5502_init_dev_type(struct sm5502_muic_info *info)
522 {
523 	unsigned int reg_data, vendor_id, version_id;
524 	int i, ret;
525 
526 	/* To test I2C, Print version_id and vendor_id of SM5502 */
527 	ret = regmap_read(info->regmap, SM5502_REG_DEVICE_ID, &reg_data);
528 	if (ret) {
529 		dev_err(info->dev,
530 			"failed to read DEVICE_ID register: %d\n", ret);
531 		return;
532 	}
533 
534 	vendor_id = ((reg_data & SM5502_REG_DEVICE_ID_VENDOR_MASK) >>
535 				SM5502_REG_DEVICE_ID_VENDOR_SHIFT);
536 	version_id = ((reg_data & SM5502_REG_DEVICE_ID_VERSION_MASK) >>
537 				SM5502_REG_DEVICE_ID_VERSION_SHIFT);
538 
539 	dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
540 			    version_id, vendor_id);
541 
542 	/* Initiazle the register of SM5502 device to bring-up */
543 	for (i = 0; i < info->num_reg_data; i++) {
544 		unsigned int val = 0;
545 
546 		if (!info->reg_data[i].invert)
547 			val |= ~info->reg_data[i].val;
548 		else
549 			val = info->reg_data[i].val;
550 		regmap_write(info->regmap, info->reg_data[i].reg, val);
551 	}
552 }
553 
554 static int sm5022_muic_i2c_probe(struct i2c_client *i2c,
555 				 const struct i2c_device_id *id)
556 {
557 	struct device_node *np = i2c->dev.of_node;
558 	struct sm5502_muic_info *info;
559 	int i, ret, irq_flags;
560 
561 	if (!np)
562 		return -EINVAL;
563 
564 	info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
565 	if (!info)
566 		return -ENOMEM;
567 	i2c_set_clientdata(i2c, info);
568 
569 	info->dev = &i2c->dev;
570 	info->i2c = i2c;
571 	info->irq = i2c->irq;
572 	info->muic_irqs = sm5502_muic_irqs;
573 	info->num_muic_irqs = ARRAY_SIZE(sm5502_muic_irqs);
574 	info->reg_data = sm5502_reg_data;
575 	info->num_reg_data = ARRAY_SIZE(sm5502_reg_data);
576 
577 	mutex_init(&info->mutex);
578 
579 	INIT_WORK(&info->irq_work, sm5502_muic_irq_work);
580 
581 	info->regmap = devm_regmap_init_i2c(i2c, &sm5502_muic_regmap_config);
582 	if (IS_ERR(info->regmap)) {
583 		ret = PTR_ERR(info->regmap);
584 		dev_err(info->dev, "failed to allocate register map: %d\n",
585 				   ret);
586 		return ret;
587 	}
588 
589 	/* Support irq domain for SM5502 MUIC device */
590 	irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED;
591 	ret = regmap_add_irq_chip(info->regmap, info->irq, irq_flags, 0,
592 				  &sm5502_muic_irq_chip, &info->irq_data);
593 	if (ret != 0) {
594 		dev_err(info->dev, "failed to request IRQ %d: %d\n",
595 				    info->irq, ret);
596 		return ret;
597 	}
598 
599 	for (i = 0; i < info->num_muic_irqs; i++) {
600 		struct muic_irq *muic_irq = &info->muic_irqs[i];
601 		unsigned int virq = 0;
602 
603 		virq = regmap_irq_get_virq(info->irq_data, muic_irq->irq);
604 		if (virq <= 0)
605 			return -EINVAL;
606 		muic_irq->virq = virq;
607 
608 		ret = devm_request_threaded_irq(info->dev, virq, NULL,
609 						sm5502_muic_irq_handler,
610 						IRQF_NO_SUSPEND,
611 						muic_irq->name, info);
612 		if (ret) {
613 			dev_err(info->dev,
614 				"failed: irq request (IRQ: %d, error :%d)\n",
615 				muic_irq->irq, ret);
616 			return ret;
617 		}
618 	}
619 
620 	/* Allocate extcon device */
621 	info->edev = devm_extcon_dev_allocate(info->dev, sm5502_extcon_cable);
622 	if (IS_ERR(info->edev)) {
623 		dev_err(info->dev, "failed to allocate memory for extcon\n");
624 		return -ENOMEM;
625 	}
626 	info->edev->name = np->name;
627 
628 	/* Register extcon device */
629 	ret = devm_extcon_dev_register(info->dev, info->edev);
630 	if (ret) {
631 		dev_err(info->dev, "failed to register extcon device\n");
632 		return ret;
633 	}
634 
635 	/*
636 	 * Detect accessory after completing the initialization of platform
637 	 *
638 	 * - Use delayed workqueue to detect cable state and then
639 	 * notify cable state to notifiee/platform through uevent.
640 	 * After completing the booting of platform, the extcon provider
641 	 * driver should notify cable state to upper layer.
642 	 */
643 	INIT_DELAYED_WORK(&info->wq_detcable, sm5502_muic_detect_cable_wq);
644 	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
645 			msecs_to_jiffies(DELAY_MS_DEFAULT));
646 
647 	/* Initialize SM5502 device and print vendor id and version id */
648 	sm5502_init_dev_type(info);
649 
650 	return 0;
651 }
652 
653 static int sm5502_muic_i2c_remove(struct i2c_client *i2c)
654 {
655 	struct sm5502_muic_info *info = i2c_get_clientdata(i2c);
656 
657 	regmap_del_irq_chip(info->irq, info->irq_data);
658 
659 	return 0;
660 }
661 
662 static struct of_device_id sm5502_dt_match[] = {
663 	{ .compatible = "siliconmitus,sm5502-muic" },
664 	{ },
665 };
666 
667 #ifdef CONFIG_PM_SLEEP
668 static int sm5502_muic_suspend(struct device *dev)
669 {
670 	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
671 	struct sm5502_muic_info *info = i2c_get_clientdata(i2c);
672 
673 	enable_irq_wake(info->irq);
674 
675 	return 0;
676 }
677 
678 static int sm5502_muic_resume(struct device *dev)
679 {
680 	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
681 	struct sm5502_muic_info *info = i2c_get_clientdata(i2c);
682 
683 	disable_irq_wake(info->irq);
684 
685 	return 0;
686 }
687 #endif
688 
689 static SIMPLE_DEV_PM_OPS(sm5502_muic_pm_ops,
690 			 sm5502_muic_suspend, sm5502_muic_resume);
691 
692 static const struct i2c_device_id sm5502_i2c_id[] = {
693 	{ "sm5502", TYPE_SM5502 },
694 	{ }
695 };
696 MODULE_DEVICE_TABLE(i2c, sm5502_i2c_id);
697 
698 static struct i2c_driver sm5502_muic_i2c_driver = {
699 	.driver		= {
700 		.name	= "sm5502",
701 		.owner	= THIS_MODULE,
702 		.pm	= &sm5502_muic_pm_ops,
703 		.of_match_table = sm5502_dt_match,
704 	},
705 	.probe	= sm5022_muic_i2c_probe,
706 	.remove	= sm5502_muic_i2c_remove,
707 	.id_table = sm5502_i2c_id,
708 };
709 
710 static int __init sm5502_muic_i2c_init(void)
711 {
712 	return i2c_add_driver(&sm5502_muic_i2c_driver);
713 }
714 subsys_initcall(sm5502_muic_i2c_init);
715 
716 MODULE_DESCRIPTION("Silicon Mitus SM5502 Extcon driver");
717 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
718 MODULE_LICENSE("GPL");
719