1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * extcon-sm5502.c - Silicon Mitus SM5502 extcon drvier 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/interrupt.h>
12 #include <linux/irqdomain.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/regmap.h>
17 #include <linux/slab.h>
18 #include <linux/extcon-provider.h>
19 
20 #include "extcon-sm5502.h"
21 
22 #define	DELAY_MS_DEFAULT		17000	/* unit: millisecond */
23 
24 struct muic_irq {
25 	unsigned int irq;
26 	const char *name;
27 	unsigned int virq;
28 };
29 
30 struct reg_data {
31 	u8 reg;
32 	unsigned int val;
33 	bool invert;
34 };
35 
36 struct sm5502_muic_info {
37 	struct device *dev;
38 	struct extcon_dev *edev;
39 
40 	struct i2c_client *i2c;
41 	struct regmap *regmap;
42 
43 	const struct sm5502_type *type;
44 	struct regmap_irq_chip_data *irq_data;
45 	int irq;
46 	bool irq_attach;
47 	bool irq_detach;
48 	struct work_struct irq_work;
49 
50 	struct mutex mutex;
51 
52 	/*
53 	 * Use delayed workqueue to detect cable state and then
54 	 * notify cable state to notifiee/platform through uevent.
55 	 * After completing the booting of platform, the extcon provider
56 	 * driver should notify cable state to upper layer.
57 	 */
58 	struct delayed_work wq_detcable;
59 };
60 
61 struct sm5502_type {
62 	struct muic_irq *muic_irqs;
63 	unsigned int num_muic_irqs;
64 	const struct regmap_irq_chip *irq_chip;
65 
66 	struct reg_data *reg_data;
67 	unsigned int num_reg_data;
68 
69 	unsigned int otg_dev_type1;
70 	int (*parse_irq)(struct sm5502_muic_info *info, int irq_type);
71 };
72 
73 /* Default value of SM5502 register to bring up MUIC device. */
74 static struct reg_data sm5502_reg_data[] = {
75 	{
76 		.reg = SM5502_REG_RESET,
77 		.val = SM5502_REG_RESET_MASK,
78 		.invert = true,
79 	}, {
80 		.reg = SM5502_REG_CONTROL,
81 		.val = SM5502_REG_CONTROL_MASK_INT_MASK,
82 		.invert = false,
83 	}, {
84 		.reg = SM5502_REG_INTMASK1,
85 		.val = SM5502_REG_INTM1_KP_MASK
86 			| SM5502_REG_INTM1_LKP_MASK
87 			| SM5502_REG_INTM1_LKR_MASK,
88 		.invert = true,
89 	}, {
90 		.reg = SM5502_REG_INTMASK2,
91 		.val = SM5502_REG_INTM2_VBUS_DET_MASK
92 			| SM5502_REG_INTM2_REV_ACCE_MASK
93 			| SM5502_REG_INTM2_ADC_CHG_MASK
94 			| SM5502_REG_INTM2_STUCK_KEY_MASK
95 			| SM5502_REG_INTM2_STUCK_KEY_RCV_MASK
96 			| SM5502_REG_INTM2_MHL_MASK,
97 		.invert = true,
98 	},
99 };
100 
101 /* Default value of SM5504 register to bring up MUIC device. */
102 static struct reg_data sm5504_reg_data[] = {
103 	{
104 		.reg = SM5502_REG_RESET,
105 		.val = SM5502_REG_RESET_MASK,
106 		.invert = true,
107 	}, {
108 		.reg = SM5502_REG_INTMASK1,
109 		.val = SM5504_REG_INTM1_ATTACH_MASK
110 			| SM5504_REG_INTM1_DETACH_MASK,
111 		.invert = false,
112 	}, {
113 		.reg = SM5502_REG_INTMASK2,
114 		.val = SM5504_REG_INTM2_RID_CHG_MASK
115 			| SM5504_REG_INTM2_UVLO_MASK
116 			| SM5504_REG_INTM2_POR_MASK,
117 		.invert = true,
118 	}, {
119 		.reg = SM5502_REG_CONTROL,
120 		.val = SM5502_REG_CONTROL_MANUAL_SW_MASK
121 			| SM5504_REG_CONTROL_CHGTYP_MASK
122 			| SM5504_REG_CONTROL_USBCHDEN_MASK
123 			| SM5504_REG_CONTROL_ADC_EN_MASK,
124 		.invert = true,
125 	},
126 };
127 
128 /* List of detectable cables */
129 static const unsigned int sm5502_extcon_cable[] = {
130 	EXTCON_USB,
131 	EXTCON_USB_HOST,
132 	EXTCON_CHG_USB_SDP,
133 	EXTCON_CHG_USB_DCP,
134 	EXTCON_NONE,
135 };
136 
137 /* Define supported accessory type */
138 enum sm5502_muic_acc_type {
139 	SM5502_MUIC_ADC_GROUND = 0x0,
140 	SM5502_MUIC_ADC_SEND_END_BUTTON,
141 	SM5502_MUIC_ADC_REMOTE_S1_BUTTON,
142 	SM5502_MUIC_ADC_REMOTE_S2_BUTTON,
143 	SM5502_MUIC_ADC_REMOTE_S3_BUTTON,
144 	SM5502_MUIC_ADC_REMOTE_S4_BUTTON,
145 	SM5502_MUIC_ADC_REMOTE_S5_BUTTON,
146 	SM5502_MUIC_ADC_REMOTE_S6_BUTTON,
147 	SM5502_MUIC_ADC_REMOTE_S7_BUTTON,
148 	SM5502_MUIC_ADC_REMOTE_S8_BUTTON,
149 	SM5502_MUIC_ADC_REMOTE_S9_BUTTON,
150 	SM5502_MUIC_ADC_REMOTE_S10_BUTTON,
151 	SM5502_MUIC_ADC_REMOTE_S11_BUTTON,
152 	SM5502_MUIC_ADC_REMOTE_S12_BUTTON,
153 	SM5502_MUIC_ADC_RESERVED_ACC_1,
154 	SM5502_MUIC_ADC_RESERVED_ACC_2,
155 	SM5502_MUIC_ADC_RESERVED_ACC_3,
156 	SM5502_MUIC_ADC_RESERVED_ACC_4,
157 	SM5502_MUIC_ADC_RESERVED_ACC_5,
158 	SM5502_MUIC_ADC_AUDIO_TYPE2,
159 	SM5502_MUIC_ADC_PHONE_POWERED_DEV,
160 	SM5502_MUIC_ADC_TTY_CONVERTER,
161 	SM5502_MUIC_ADC_UART_CABLE,
162 	SM5502_MUIC_ADC_TYPE1_CHARGER,
163 	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB,
164 	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB,
165 	SM5502_MUIC_ADC_AUDIO_VIDEO_CABLE,
166 	SM5502_MUIC_ADC_TYPE2_CHARGER,
167 	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART,
168 	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART,
169 	SM5502_MUIC_ADC_AUDIO_TYPE1,
170 	SM5502_MUIC_ADC_OPEN = 0x1f,
171 
172 	/*
173 	 * The below accessories have same ADC value (0x1f or 0x1e).
174 	 * So, Device type1 is used to separate specific accessory.
175 	 */
176 							/* |---------|--ADC| */
177 							/* |    [7:5]|[4:0]| */
178 	SM5502_MUIC_ADC_AUDIO_TYPE1_FULL_REMOTE = 0x3e,	/* |      001|11110| */
179 	SM5502_MUIC_ADC_AUDIO_TYPE1_SEND_END = 0x5e,	/* |      010|11110| */
180 							/* |Dev Type1|--ADC| */
181 	SM5502_MUIC_ADC_GROUND_USB_OTG = 0x80,		/* |      100|00000| */
182 	SM5502_MUIC_ADC_OPEN_USB = 0x5f,		/* |      010|11111| */
183 	SM5502_MUIC_ADC_OPEN_TA = 0xdf,			/* |      110|11111| */
184 	SM5502_MUIC_ADC_OPEN_USB_OTG = 0xff,		/* |      111|11111| */
185 };
186 
187 /* List of supported interrupt for SM5502 */
188 static struct muic_irq sm5502_muic_irqs[] = {
189 	{ SM5502_IRQ_INT1_ATTACH,	"muic-attach" },
190 	{ SM5502_IRQ_INT1_DETACH,	"muic-detach" },
191 	{ SM5502_IRQ_INT1_KP,		"muic-kp" },
192 	{ SM5502_IRQ_INT1_LKP,		"muic-lkp" },
193 	{ SM5502_IRQ_INT1_LKR,		"muic-lkr" },
194 	{ SM5502_IRQ_INT1_OVP_EVENT,	"muic-ovp-event" },
195 	{ SM5502_IRQ_INT1_OCP_EVENT,	"muic-ocp-event" },
196 	{ SM5502_IRQ_INT1_OVP_OCP_DIS,	"muic-ovp-ocp-dis" },
197 	{ SM5502_IRQ_INT2_VBUS_DET,	"muic-vbus-det" },
198 	{ SM5502_IRQ_INT2_REV_ACCE,	"muic-rev-acce" },
199 	{ SM5502_IRQ_INT2_ADC_CHG,	"muic-adc-chg" },
200 	{ SM5502_IRQ_INT2_STUCK_KEY,	"muic-stuck-key" },
201 	{ SM5502_IRQ_INT2_STUCK_KEY_RCV, "muic-stuck-key-rcv" },
202 	{ SM5502_IRQ_INT2_MHL,		"muic-mhl" },
203 };
204 
205 /* Define interrupt list of SM5502 to register regmap_irq */
206 static const struct regmap_irq sm5502_irqs[] = {
207 	/* INT1 interrupts */
208 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_ATTACH_MASK, },
209 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_DETACH_MASK, },
210 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_KP_MASK, },
211 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_LKP_MASK, },
212 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_LKR_MASK, },
213 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_OVP_EVENT_MASK, },
214 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_OCP_EVENT_MASK, },
215 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_OVP_OCP_DIS_MASK, },
216 
217 	/* INT2 interrupts */
218 	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_VBUS_DET_MASK,},
219 	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_REV_ACCE_MASK, },
220 	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_ADC_CHG_MASK, },
221 	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_STUCK_KEY_MASK, },
222 	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_STUCK_KEY_RCV_MASK, },
223 	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_MHL_MASK, },
224 };
225 
226 static const struct regmap_irq_chip sm5502_muic_irq_chip = {
227 	.name			= "sm5502",
228 	.status_base		= SM5502_REG_INT1,
229 	.mask_base		= SM5502_REG_INTMASK1,
230 	.mask_invert		= false,
231 	.num_regs		= 2,
232 	.irqs			= sm5502_irqs,
233 	.num_irqs		= ARRAY_SIZE(sm5502_irqs),
234 };
235 
236 /* List of supported interrupt for SM5504 */
237 static struct muic_irq sm5504_muic_irqs[] = {
238 	{ SM5504_IRQ_INT1_ATTACH,	"muic-attach" },
239 	{ SM5504_IRQ_INT1_DETACH,	"muic-detach" },
240 	{ SM5504_IRQ_INT1_CHG_DET,	"muic-chg-det" },
241 	{ SM5504_IRQ_INT1_DCD_OUT,	"muic-dcd-out" },
242 	{ SM5504_IRQ_INT1_OVP_EVENT,	"muic-ovp-event" },
243 	{ SM5504_IRQ_INT1_CONNECT,	"muic-connect" },
244 	{ SM5504_IRQ_INT1_ADC_CHG,	"muic-adc-chg" },
245 	{ SM5504_IRQ_INT2_RID_CHG,	"muic-rid-chg" },
246 	{ SM5504_IRQ_INT2_UVLO,		"muic-uvlo" },
247 	{ SM5504_IRQ_INT2_POR,		"muic-por" },
248 	{ SM5504_IRQ_INT2_OVP_FET,	"muic-ovp-fet" },
249 	{ SM5504_IRQ_INT2_OCP_LATCH,	"muic-ocp-latch" },
250 	{ SM5504_IRQ_INT2_OCP_EVENT,	"muic-ocp-event" },
251 	{ SM5504_IRQ_INT2_OVP_OCP_EVENT, "muic-ovp-ocp-event" },
252 };
253 
254 /* Define interrupt list of SM5504 to register regmap_irq */
255 static const struct regmap_irq sm5504_irqs[] = {
256 	/* INT1 interrupts */
257 	{ .reg_offset = 0, .mask = SM5504_IRQ_INT1_ATTACH_MASK, },
258 	{ .reg_offset = 0, .mask = SM5504_IRQ_INT1_DETACH_MASK, },
259 	{ .reg_offset = 0, .mask = SM5504_IRQ_INT1_CHG_DET_MASK, },
260 	{ .reg_offset = 0, .mask = SM5504_IRQ_INT1_DCD_OUT_MASK, },
261 	{ .reg_offset = 0, .mask = SM5504_IRQ_INT1_OVP_MASK, },
262 	{ .reg_offset = 0, .mask = SM5504_IRQ_INT1_CONNECT_MASK, },
263 	{ .reg_offset = 0, .mask = SM5504_IRQ_INT1_ADC_CHG_MASK, },
264 
265 	/* INT2 interrupts */
266 	{ .reg_offset = 1, .mask = SM5504_IRQ_INT2_RID_CHG_MASK,},
267 	{ .reg_offset = 1, .mask = SM5504_IRQ_INT2_UVLO_MASK, },
268 	{ .reg_offset = 1, .mask = SM5504_IRQ_INT2_POR_MASK, },
269 	{ .reg_offset = 1, .mask = SM5504_IRQ_INT2_OVP_FET_MASK, },
270 	{ .reg_offset = 1, .mask = SM5504_IRQ_INT2_OCP_LATCH_MASK, },
271 	{ .reg_offset = 1, .mask = SM5504_IRQ_INT2_OCP_EVENT_MASK, },
272 	{ .reg_offset = 1, .mask = SM5504_IRQ_INT2_OVP_OCP_EVENT_MASK, },
273 };
274 
275 static const struct regmap_irq_chip sm5504_muic_irq_chip = {
276 	.name			= "sm5504",
277 	.status_base		= SM5502_REG_INT1,
278 	.mask_base		= SM5502_REG_INTMASK1,
279 	.mask_invert		= false,
280 	.num_regs		= 2,
281 	.irqs			= sm5504_irqs,
282 	.num_irqs		= ARRAY_SIZE(sm5504_irqs),
283 };
284 
285 /* Define regmap configuration of SM5502 for I2C communication  */
286 static bool sm5502_muic_volatile_reg(struct device *dev, unsigned int reg)
287 {
288 	switch (reg) {
289 	case SM5502_REG_INTMASK1:
290 	case SM5502_REG_INTMASK2:
291 		return true;
292 	default:
293 		break;
294 	}
295 	return false;
296 }
297 
298 static const struct regmap_config sm5502_muic_regmap_config = {
299 	.reg_bits	= 8,
300 	.val_bits	= 8,
301 	.volatile_reg	= sm5502_muic_volatile_reg,
302 	.max_register	= SM5502_REG_END,
303 };
304 
305 /* Change DM_CON/DP_CON/VBUSIN switch according to cable type */
306 static int sm5502_muic_set_path(struct sm5502_muic_info *info,
307 				unsigned int con_sw, unsigned int vbus_sw,
308 				bool attached)
309 {
310 	int ret;
311 
312 	if (!attached) {
313 		con_sw	= DM_DP_SWITCH_OPEN;
314 		vbus_sw	= VBUSIN_SWITCH_OPEN;
315 	}
316 
317 	switch (con_sw) {
318 	case DM_DP_SWITCH_OPEN:
319 	case DM_DP_SWITCH_USB:
320 	case DM_DP_SWITCH_AUDIO:
321 	case DM_DP_SWITCH_UART:
322 		ret = regmap_update_bits(info->regmap, SM5502_REG_MANUAL_SW1,
323 					 SM5502_REG_MANUAL_SW1_DP_MASK |
324 					 SM5502_REG_MANUAL_SW1_DM_MASK,
325 					 con_sw);
326 		if (ret < 0) {
327 			dev_err(info->dev,
328 				"cannot update DM_CON/DP_CON switch\n");
329 			return ret;
330 		}
331 		break;
332 	default:
333 		dev_err(info->dev, "Unknown DM_CON/DP_CON switch type (%d)\n",
334 				con_sw);
335 		return -EINVAL;
336 	}
337 
338 	switch (vbus_sw) {
339 	case VBUSIN_SWITCH_OPEN:
340 	case VBUSIN_SWITCH_VBUSOUT:
341 	case VBUSIN_SWITCH_MIC:
342 	case VBUSIN_SWITCH_VBUSOUT_WITH_USB:
343 		ret = regmap_update_bits(info->regmap, SM5502_REG_MANUAL_SW1,
344 					 SM5502_REG_MANUAL_SW1_VBUSIN_MASK,
345 					 vbus_sw);
346 		if (ret < 0) {
347 			dev_err(info->dev,
348 				"cannot update VBUSIN switch\n");
349 			return ret;
350 		}
351 		break;
352 	default:
353 		dev_err(info->dev, "Unknown VBUS switch type (%d)\n", vbus_sw);
354 		return -EINVAL;
355 	}
356 
357 	return 0;
358 }
359 
360 /* Return cable type of attached or detached accessories */
361 static unsigned int sm5502_muic_get_cable_type(struct sm5502_muic_info *info)
362 {
363 	unsigned int cable_type, adc, dev_type1;
364 	int ret;
365 
366 	/* Read ADC value according to external cable or button */
367 	ret = regmap_read(info->regmap, SM5502_REG_ADC, &adc);
368 	if (ret) {
369 		dev_err(info->dev, "failed to read ADC register\n");
370 		return ret;
371 	}
372 
373 	/*
374 	 * If ADC is SM5502_MUIC_ADC_GROUND(0x0), external cable hasn't
375 	 * connected with to MUIC device.
376 	 */
377 	cable_type = adc & SM5502_REG_ADC_MASK;
378 
379 	switch (cable_type) {
380 	case SM5502_MUIC_ADC_GROUND:
381 		ret = regmap_read(info->regmap, SM5502_REG_DEV_TYPE1,
382 				  &dev_type1);
383 		if (ret) {
384 			dev_err(info->dev, "failed to read DEV_TYPE1 reg\n");
385 			return ret;
386 		}
387 
388 		if (dev_type1 == info->type->otg_dev_type1) {
389 			cable_type = SM5502_MUIC_ADC_GROUND_USB_OTG;
390 		} else {
391 			dev_dbg(info->dev,
392 				"cannot identify the cable type: adc(0x%x), dev_type1(0x%x)\n",
393 				adc, dev_type1);
394 			return -EINVAL;
395 		}
396 		break;
397 	case SM5502_MUIC_ADC_SEND_END_BUTTON:
398 	case SM5502_MUIC_ADC_REMOTE_S1_BUTTON:
399 	case SM5502_MUIC_ADC_REMOTE_S2_BUTTON:
400 	case SM5502_MUIC_ADC_REMOTE_S3_BUTTON:
401 	case SM5502_MUIC_ADC_REMOTE_S4_BUTTON:
402 	case SM5502_MUIC_ADC_REMOTE_S5_BUTTON:
403 	case SM5502_MUIC_ADC_REMOTE_S6_BUTTON:
404 	case SM5502_MUIC_ADC_REMOTE_S7_BUTTON:
405 	case SM5502_MUIC_ADC_REMOTE_S8_BUTTON:
406 	case SM5502_MUIC_ADC_REMOTE_S9_BUTTON:
407 	case SM5502_MUIC_ADC_REMOTE_S10_BUTTON:
408 	case SM5502_MUIC_ADC_REMOTE_S11_BUTTON:
409 	case SM5502_MUIC_ADC_REMOTE_S12_BUTTON:
410 	case SM5502_MUIC_ADC_RESERVED_ACC_1:
411 	case SM5502_MUIC_ADC_RESERVED_ACC_2:
412 	case SM5502_MUIC_ADC_RESERVED_ACC_3:
413 	case SM5502_MUIC_ADC_RESERVED_ACC_4:
414 	case SM5502_MUIC_ADC_RESERVED_ACC_5:
415 	case SM5502_MUIC_ADC_AUDIO_TYPE2:
416 	case SM5502_MUIC_ADC_PHONE_POWERED_DEV:
417 	case SM5502_MUIC_ADC_TTY_CONVERTER:
418 	case SM5502_MUIC_ADC_UART_CABLE:
419 	case SM5502_MUIC_ADC_TYPE1_CHARGER:
420 	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB:
421 	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB:
422 	case SM5502_MUIC_ADC_AUDIO_VIDEO_CABLE:
423 	case SM5502_MUIC_ADC_TYPE2_CHARGER:
424 	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART:
425 	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART:
426 		break;
427 	case SM5502_MUIC_ADC_AUDIO_TYPE1:
428 		/*
429 		 * Check whether cable type is
430 		 * SM5502_MUIC_ADC_AUDIO_TYPE1_FULL_REMOTE
431 		 * or SM5502_MUIC_ADC_AUDIO_TYPE1_SEND_END
432 		 * by using Button event.
433 		 */
434 		break;
435 	case SM5502_MUIC_ADC_OPEN:
436 		ret = regmap_read(info->regmap, SM5502_REG_DEV_TYPE1,
437 				  &dev_type1);
438 		if (ret) {
439 			dev_err(info->dev, "failed to read DEV_TYPE1 reg\n");
440 			return ret;
441 		}
442 
443 		if (dev_type1 == info->type->otg_dev_type1) {
444 			cable_type = SM5502_MUIC_ADC_OPEN_USB_OTG;
445 			break;
446 		}
447 
448 		switch (dev_type1) {
449 		case SM5502_REG_DEV_TYPE1_USB_SDP_MASK:
450 			cable_type = SM5502_MUIC_ADC_OPEN_USB;
451 			break;
452 		case SM5502_REG_DEV_TYPE1_DEDICATED_CHG_MASK:
453 			cable_type = SM5502_MUIC_ADC_OPEN_TA;
454 			break;
455 		default:
456 			dev_dbg(info->dev,
457 				"cannot identify the cable type: adc(0x%x)\n",
458 				adc);
459 			return -EINVAL;
460 		}
461 		break;
462 	default:
463 		dev_err(info->dev,
464 			"failed to identify the cable type: adc(0x%x)\n", adc);
465 		return -EINVAL;
466 	}
467 
468 	return cable_type;
469 }
470 
471 static int sm5502_muic_cable_handler(struct sm5502_muic_info *info,
472 				     bool attached)
473 {
474 	static unsigned int prev_cable_type = SM5502_MUIC_ADC_GROUND;
475 	unsigned int cable_type = SM5502_MUIC_ADC_GROUND;
476 	unsigned int con_sw = DM_DP_SWITCH_OPEN;
477 	unsigned int vbus_sw = VBUSIN_SWITCH_OPEN;
478 	unsigned int id;
479 	int ret;
480 
481 	/* Get the type of attached or detached cable */
482 	if (attached)
483 		cable_type = sm5502_muic_get_cable_type(info);
484 	else
485 		cable_type = prev_cable_type;
486 	prev_cable_type = cable_type;
487 
488 	switch (cable_type) {
489 	case SM5502_MUIC_ADC_OPEN_USB:
490 		id	= EXTCON_USB;
491 		con_sw	= DM_DP_SWITCH_USB;
492 		vbus_sw	= VBUSIN_SWITCH_VBUSOUT_WITH_USB;
493 		break;
494 	case SM5502_MUIC_ADC_OPEN_TA:
495 		id	= EXTCON_CHG_USB_DCP;
496 		con_sw	= DM_DP_SWITCH_OPEN;
497 		vbus_sw	= VBUSIN_SWITCH_VBUSOUT;
498 		break;
499 	case SM5502_MUIC_ADC_GROUND_USB_OTG:
500 	case SM5502_MUIC_ADC_OPEN_USB_OTG:
501 		id	= EXTCON_USB_HOST;
502 		con_sw	= DM_DP_SWITCH_USB;
503 		vbus_sw	= VBUSIN_SWITCH_OPEN;
504 		break;
505 	default:
506 		dev_dbg(info->dev,
507 			"cannot handle this cable_type (0x%x)\n", cable_type);
508 		return 0;
509 	}
510 
511 	/* Change internal hardware path(DM_CON/DP_CON, VBUSIN) */
512 	ret = sm5502_muic_set_path(info, con_sw, vbus_sw, attached);
513 	if (ret < 0)
514 		return ret;
515 
516 	/* Change the state of external accessory */
517 	extcon_set_state_sync(info->edev, id, attached);
518 	if (id == EXTCON_USB)
519 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
520 					attached);
521 
522 	return 0;
523 }
524 
525 static void sm5502_muic_irq_work(struct work_struct *work)
526 {
527 	struct sm5502_muic_info *info = container_of(work,
528 			struct sm5502_muic_info, irq_work);
529 	int ret = 0;
530 
531 	if (!info->edev)
532 		return;
533 
534 	mutex_lock(&info->mutex);
535 
536 	/* Detect attached or detached cables */
537 	if (info->irq_attach) {
538 		ret = sm5502_muic_cable_handler(info, true);
539 		info->irq_attach = false;
540 	}
541 	if (info->irq_detach) {
542 		ret = sm5502_muic_cable_handler(info, false);
543 		info->irq_detach = false;
544 	}
545 
546 	if (ret < 0)
547 		dev_err(info->dev, "failed to handle MUIC interrupt\n");
548 
549 	mutex_unlock(&info->mutex);
550 }
551 
552 /*
553  * Sets irq_attach or irq_detach in sm5502_muic_info and returns 0.
554  * Returns -ESRCH if irq_type does not match registered IRQ for this dev type.
555  */
556 static int sm5502_parse_irq(struct sm5502_muic_info *info, int irq_type)
557 {
558 	switch (irq_type) {
559 	case SM5502_IRQ_INT1_ATTACH:
560 		info->irq_attach = true;
561 		break;
562 	case SM5502_IRQ_INT1_DETACH:
563 		info->irq_detach = true;
564 		break;
565 	case SM5502_IRQ_INT1_KP:
566 	case SM5502_IRQ_INT1_LKP:
567 	case SM5502_IRQ_INT1_LKR:
568 	case SM5502_IRQ_INT1_OVP_EVENT:
569 	case SM5502_IRQ_INT1_OCP_EVENT:
570 	case SM5502_IRQ_INT1_OVP_OCP_DIS:
571 	case SM5502_IRQ_INT2_VBUS_DET:
572 	case SM5502_IRQ_INT2_REV_ACCE:
573 	case SM5502_IRQ_INT2_ADC_CHG:
574 	case SM5502_IRQ_INT2_STUCK_KEY:
575 	case SM5502_IRQ_INT2_STUCK_KEY_RCV:
576 	case SM5502_IRQ_INT2_MHL:
577 	default:
578 		break;
579 	}
580 
581 	return 0;
582 }
583 
584 static int sm5504_parse_irq(struct sm5502_muic_info *info, int irq_type)
585 {
586 	switch (irq_type) {
587 	case SM5504_IRQ_INT1_ATTACH:
588 		info->irq_attach = true;
589 		break;
590 	case SM5504_IRQ_INT1_DETACH:
591 		info->irq_detach = true;
592 		break;
593 	case SM5504_IRQ_INT1_CHG_DET:
594 	case SM5504_IRQ_INT1_DCD_OUT:
595 	case SM5504_IRQ_INT1_OVP_EVENT:
596 	case SM5504_IRQ_INT1_CONNECT:
597 	case SM5504_IRQ_INT1_ADC_CHG:
598 	case SM5504_IRQ_INT2_RID_CHG:
599 	case SM5504_IRQ_INT2_UVLO:
600 	case SM5504_IRQ_INT2_POR:
601 	case SM5504_IRQ_INT2_OVP_FET:
602 	case SM5504_IRQ_INT2_OCP_LATCH:
603 	case SM5504_IRQ_INT2_OCP_EVENT:
604 	case SM5504_IRQ_INT2_OVP_OCP_EVENT:
605 	default:
606 		break;
607 	}
608 
609 	return 0;
610 }
611 
612 static irqreturn_t sm5502_muic_irq_handler(int irq, void *data)
613 {
614 	struct sm5502_muic_info *info = data;
615 	int i, irq_type = -1, ret;
616 
617 	for (i = 0; i < info->type->num_muic_irqs; i++)
618 		if (irq == info->type->muic_irqs[i].virq)
619 			irq_type = info->type->muic_irqs[i].irq;
620 
621 	ret = info->type->parse_irq(info, irq_type);
622 	if (ret < 0) {
623 		dev_warn(info->dev, "cannot handle is interrupt:%d\n",
624 				    irq_type);
625 		return IRQ_HANDLED;
626 	}
627 	schedule_work(&info->irq_work);
628 
629 	return IRQ_HANDLED;
630 }
631 
632 static void sm5502_muic_detect_cable_wq(struct work_struct *work)
633 {
634 	struct sm5502_muic_info *info = container_of(to_delayed_work(work),
635 				struct sm5502_muic_info, wq_detcable);
636 	int ret;
637 
638 	/* Notify the state of connector cable or not  */
639 	ret = sm5502_muic_cable_handler(info, true);
640 	if (ret < 0)
641 		dev_warn(info->dev, "failed to detect cable state\n");
642 }
643 
644 static void sm5502_init_dev_type(struct sm5502_muic_info *info)
645 {
646 	unsigned int reg_data, vendor_id, version_id;
647 	int i, ret;
648 
649 	/* To test I2C, Print version_id and vendor_id of SM5502 */
650 	ret = regmap_read(info->regmap, SM5502_REG_DEVICE_ID, &reg_data);
651 	if (ret) {
652 		dev_err(info->dev,
653 			"failed to read DEVICE_ID register: %d\n", ret);
654 		return;
655 	}
656 
657 	vendor_id = ((reg_data & SM5502_REG_DEVICE_ID_VENDOR_MASK) >>
658 				SM5502_REG_DEVICE_ID_VENDOR_SHIFT);
659 	version_id = ((reg_data & SM5502_REG_DEVICE_ID_VERSION_MASK) >>
660 				SM5502_REG_DEVICE_ID_VERSION_SHIFT);
661 
662 	dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
663 			    version_id, vendor_id);
664 
665 	/* Initiazle the register of SM5502 device to bring-up */
666 	for (i = 0; i < info->type->num_reg_data; i++) {
667 		unsigned int val = 0;
668 
669 		if (!info->type->reg_data[i].invert)
670 			val |= ~info->type->reg_data[i].val;
671 		else
672 			val = info->type->reg_data[i].val;
673 		regmap_write(info->regmap, info->type->reg_data[i].reg, val);
674 	}
675 }
676 
677 static int sm5022_muic_i2c_probe(struct i2c_client *i2c)
678 {
679 	struct device_node *np = i2c->dev.of_node;
680 	struct sm5502_muic_info *info;
681 	int i, ret, irq_flags;
682 
683 	if (!np)
684 		return -EINVAL;
685 
686 	info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
687 	if (!info)
688 		return -ENOMEM;
689 	i2c_set_clientdata(i2c, info);
690 
691 	info->dev = &i2c->dev;
692 	info->i2c = i2c;
693 	info->irq = i2c->irq;
694 	info->type = device_get_match_data(info->dev);
695 	if (!info->type)
696 		return -EINVAL;
697 	if (!info->type->parse_irq) {
698 		dev_err(info->dev, "parse_irq missing in struct sm5502_type\n");
699 		return -EINVAL;
700 	}
701 
702 	mutex_init(&info->mutex);
703 
704 	INIT_WORK(&info->irq_work, sm5502_muic_irq_work);
705 
706 	info->regmap = devm_regmap_init_i2c(i2c, &sm5502_muic_regmap_config);
707 	if (IS_ERR(info->regmap)) {
708 		ret = PTR_ERR(info->regmap);
709 		dev_err(info->dev, "failed to allocate register map: %d\n",
710 				   ret);
711 		return ret;
712 	}
713 
714 	/* Support irq domain for SM5502 MUIC device */
715 	irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED;
716 	ret = devm_regmap_add_irq_chip(info->dev, info->regmap, info->irq,
717 				       irq_flags, 0, info->type->irq_chip,
718 				       &info->irq_data);
719 	if (ret != 0) {
720 		dev_err(info->dev, "failed to request IRQ %d: %d\n",
721 				    info->irq, ret);
722 		return ret;
723 	}
724 
725 	for (i = 0; i < info->type->num_muic_irqs; i++) {
726 		struct muic_irq *muic_irq = &info->type->muic_irqs[i];
727 		int virq = 0;
728 
729 		virq = regmap_irq_get_virq(info->irq_data, muic_irq->irq);
730 		if (virq <= 0)
731 			return -EINVAL;
732 		muic_irq->virq = virq;
733 
734 		ret = devm_request_threaded_irq(info->dev, virq, NULL,
735 						sm5502_muic_irq_handler,
736 						IRQF_NO_SUSPEND | IRQF_ONESHOT,
737 						muic_irq->name, info);
738 		if (ret) {
739 			dev_err(info->dev,
740 				"failed: irq request (IRQ: %d, error :%d)\n",
741 				muic_irq->irq, ret);
742 			return ret;
743 		}
744 	}
745 
746 	/* Allocate extcon device */
747 	info->edev = devm_extcon_dev_allocate(info->dev, sm5502_extcon_cable);
748 	if (IS_ERR(info->edev)) {
749 		dev_err(info->dev, "failed to allocate memory for extcon\n");
750 		return -ENOMEM;
751 	}
752 
753 	/* Register extcon device */
754 	ret = devm_extcon_dev_register(info->dev, info->edev);
755 	if (ret) {
756 		dev_err(info->dev, "failed to register extcon device\n");
757 		return ret;
758 	}
759 
760 	/*
761 	 * Detect accessory after completing the initialization of platform
762 	 *
763 	 * - Use delayed workqueue to detect cable state and then
764 	 * notify cable state to notifiee/platform through uevent.
765 	 * After completing the booting of platform, the extcon provider
766 	 * driver should notify cable state to upper layer.
767 	 */
768 	INIT_DELAYED_WORK(&info->wq_detcable, sm5502_muic_detect_cable_wq);
769 	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
770 			msecs_to_jiffies(DELAY_MS_DEFAULT));
771 
772 	/* Initialize SM5502 device and print vendor id and version id */
773 	sm5502_init_dev_type(info);
774 
775 	return 0;
776 }
777 
778 static const struct sm5502_type sm5502_data = {
779 	.muic_irqs = sm5502_muic_irqs,
780 	.num_muic_irqs = ARRAY_SIZE(sm5502_muic_irqs),
781 	.irq_chip = &sm5502_muic_irq_chip,
782 	.reg_data = sm5502_reg_data,
783 	.num_reg_data = ARRAY_SIZE(sm5502_reg_data),
784 	.otg_dev_type1 = SM5502_REG_DEV_TYPE1_USB_OTG_MASK,
785 	.parse_irq = sm5502_parse_irq,
786 };
787 
788 static const struct sm5502_type sm5504_data = {
789 	.muic_irqs = sm5504_muic_irqs,
790 	.num_muic_irqs = ARRAY_SIZE(sm5504_muic_irqs),
791 	.irq_chip = &sm5504_muic_irq_chip,
792 	.reg_data = sm5504_reg_data,
793 	.num_reg_data = ARRAY_SIZE(sm5504_reg_data),
794 	.otg_dev_type1 = SM5504_REG_DEV_TYPE1_USB_OTG_MASK,
795 	.parse_irq = sm5504_parse_irq,
796 };
797 
798 static const struct of_device_id sm5502_dt_match[] = {
799 	{ .compatible = "siliconmitus,sm5502-muic", .data = &sm5502_data },
800 	{ .compatible = "siliconmitus,sm5504-muic", .data = &sm5504_data },
801 	{ .compatible = "siliconmitus,sm5703-muic", .data = &sm5502_data },
802 	{ },
803 };
804 MODULE_DEVICE_TABLE(of, sm5502_dt_match);
805 
806 #ifdef CONFIG_PM_SLEEP
807 static int sm5502_muic_suspend(struct device *dev)
808 {
809 	struct i2c_client *i2c = to_i2c_client(dev);
810 	struct sm5502_muic_info *info = i2c_get_clientdata(i2c);
811 
812 	enable_irq_wake(info->irq);
813 
814 	return 0;
815 }
816 
817 static int sm5502_muic_resume(struct device *dev)
818 {
819 	struct i2c_client *i2c = to_i2c_client(dev);
820 	struct sm5502_muic_info *info = i2c_get_clientdata(i2c);
821 
822 	disable_irq_wake(info->irq);
823 
824 	return 0;
825 }
826 #endif
827 
828 static SIMPLE_DEV_PM_OPS(sm5502_muic_pm_ops,
829 			 sm5502_muic_suspend, sm5502_muic_resume);
830 
831 static const struct i2c_device_id sm5502_i2c_id[] = {
832 	{ "sm5502", (kernel_ulong_t)&sm5502_data },
833 	{ "sm5504", (kernel_ulong_t)&sm5504_data },
834 	{ "sm5703-muic", (kernel_ulong_t)&sm5502_data },
835 	{ }
836 };
837 MODULE_DEVICE_TABLE(i2c, sm5502_i2c_id);
838 
839 static struct i2c_driver sm5502_muic_i2c_driver = {
840 	.driver		= {
841 		.name	= "sm5502",
842 		.pm	= &sm5502_muic_pm_ops,
843 		.of_match_table = sm5502_dt_match,
844 	},
845 	.probe_new = sm5022_muic_i2c_probe,
846 	.id_table = sm5502_i2c_id,
847 };
848 
849 static int __init sm5502_muic_i2c_init(void)
850 {
851 	return i2c_add_driver(&sm5502_muic_i2c_driver);
852 }
853 subsys_initcall(sm5502_muic_i2c_init);
854 
855 MODULE_DESCRIPTION("Silicon Mitus SM5502 Extcon driver");
856 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
857 MODULE_LICENSE("GPL");
858