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 	.mask_invert		= false,
196 	.num_regs		= 2,
197 	.irqs			= rt8973a_irqs,
198 	.num_irqs		= ARRAY_SIZE(rt8973a_irqs),
199 };
200 
201 /* Define regmap configuration of RT8973A for I2C communication  */
rt8973a_muic_volatile_reg(struct device * dev,unsigned int reg)202 static bool rt8973a_muic_volatile_reg(struct device *dev, unsigned int reg)
203 {
204 	switch (reg) {
205 	case RT8973A_REG_INTM1:
206 	case RT8973A_REG_INTM2:
207 		return true;
208 	default:
209 		break;
210 	}
211 	return false;
212 }
213 
214 static const struct regmap_config rt8973a_muic_regmap_config = {
215 	.reg_bits	= 8,
216 	.val_bits	= 8,
217 	.volatile_reg	= rt8973a_muic_volatile_reg,
218 	.max_register	= RT8973A_REG_END,
219 };
220 
221 /* 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)222 static int rt8973a_muic_set_path(struct rt8973a_muic_info *info,
223 				unsigned int con_sw, bool attached)
224 {
225 	int ret;
226 
227 	/*
228 	 * Don't need to set h/w path according to cable type
229 	 * if Auto-configuration mode of CONTROL1 register is true.
230 	 */
231 	if (info->auto_config)
232 		return 0;
233 
234 	if (!attached)
235 		con_sw	= DM_DP_SWITCH_UART;
236 
237 	switch (con_sw) {
238 	case DM_DP_SWITCH_OPEN:
239 	case DM_DP_SWITCH_USB:
240 	case DM_DP_SWITCH_UART:
241 		ret = regmap_update_bits(info->regmap, RT8973A_REG_MANUAL_SW1,
242 					RT8973A_REG_MANUAL_SW1_DP_MASK |
243 					RT8973A_REG_MANUAL_SW1_DM_MASK,
244 					con_sw);
245 		if (ret < 0) {
246 			dev_err(info->dev,
247 				"cannot update DM_CON/DP_CON switch\n");
248 			return ret;
249 		}
250 		break;
251 	default:
252 		dev_err(info->dev, "Unknown DM_CON/DP_CON switch type (%d)\n",
253 				con_sw);
254 		return -EINVAL;
255 	}
256 
257 	return 0;
258 }
259 
rt8973a_muic_get_cable_type(struct rt8973a_muic_info * info)260 static int rt8973a_muic_get_cable_type(struct rt8973a_muic_info *info)
261 {
262 	unsigned int adc, dev1;
263 	int ret, cable_type;
264 
265 	/* Read ADC value according to external cable or button */
266 	ret = regmap_read(info->regmap, RT8973A_REG_ADC, &adc);
267 	if (ret) {
268 		dev_err(info->dev, "failed to read ADC register\n");
269 		return ret;
270 	}
271 	cable_type = adc & RT8973A_REG_ADC_MASK;
272 
273 	/* Read Device 1 reigster to identify correct cable type */
274 	ret = regmap_read(info->regmap, RT8973A_REG_DEV1, &dev1);
275 	if (ret) {
276 		dev_err(info->dev, "failed to read DEV1 register\n");
277 		return ret;
278 	}
279 
280 	switch (adc) {
281 	case RT8973A_MUIC_ADC_OPEN:
282 		if (dev1 & RT8973A_REG_DEV1_USB_MASK)
283 			cable_type = RT8973A_MUIC_ADC_USB;
284 		else if (dev1 & RT8973A_REG_DEV1_DCPORT_MASK)
285 			cable_type = RT8973A_MUIC_ADC_TA;
286 		else
287 			cable_type = RT8973A_MUIC_ADC_OPEN;
288 		break;
289 	default:
290 		break;
291 	}
292 
293 	return cable_type;
294 }
295 
rt8973a_muic_cable_handler(struct rt8973a_muic_info * info,enum rt8973a_event_type event)296 static int rt8973a_muic_cable_handler(struct rt8973a_muic_info *info,
297 					enum rt8973a_event_type event)
298 {
299 	static unsigned int prev_cable_type;
300 	unsigned int con_sw = DM_DP_SWITCH_UART;
301 	int ret, cable_type;
302 	unsigned int id;
303 	bool attached = false;
304 
305 	switch (event) {
306 	case RT8973A_EVENT_ATTACH:
307 		cable_type = rt8973a_muic_get_cable_type(info);
308 		attached = true;
309 		break;
310 	case RT8973A_EVENT_DETACH:
311 		cable_type = prev_cable_type;
312 		attached = false;
313 		break;
314 	case RT8973A_EVENT_OVP:
315 	case RT8973A_EVENT_OTP:
316 		dev_warn(info->dev,
317 			"happen Over %s issue. Need to disconnect all cables\n",
318 			event == RT8973A_EVENT_OVP ? "Voltage" : "Temperature");
319 		cable_type = prev_cable_type;
320 		attached = false;
321 		break;
322 	default:
323 		dev_err(info->dev,
324 			"Cannot handle this event (event:%d)\n", event);
325 		return -EINVAL;
326 	}
327 	prev_cable_type = cable_type;
328 
329 	switch (cable_type) {
330 	case RT8973A_MUIC_ADC_OTG:
331 		id = EXTCON_USB_HOST;
332 		con_sw = DM_DP_SWITCH_USB;
333 		break;
334 	case RT8973A_MUIC_ADC_TA:
335 		id = EXTCON_CHG_USB_DCP;
336 		con_sw = DM_DP_SWITCH_OPEN;
337 		break;
338 	case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB:
339 	case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB:
340 		id = EXTCON_JIG;
341 		con_sw = DM_DP_SWITCH_USB;
342 		break;
343 	case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART:
344 	case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART:
345 		id = EXTCON_JIG;
346 		con_sw = DM_DP_SWITCH_UART;
347 		break;
348 	case RT8973A_MUIC_ADC_USB:
349 		id = EXTCON_USB;
350 		con_sw = DM_DP_SWITCH_USB;
351 		break;
352 	case RT8973A_MUIC_ADC_OPEN:
353 		return 0;
354 	case RT8973A_MUIC_ADC_UNKNOWN_ACC_1:
355 	case RT8973A_MUIC_ADC_UNKNOWN_ACC_2:
356 	case RT8973A_MUIC_ADC_UNKNOWN_ACC_3:
357 	case RT8973A_MUIC_ADC_UNKNOWN_ACC_4:
358 	case RT8973A_MUIC_ADC_UNKNOWN_ACC_5:
359 		dev_warn(info->dev,
360 			"Unknown accessory type (adc:0x%x)\n", cable_type);
361 		return 0;
362 	case RT8973A_MUIC_ADC_AUDIO_SEND_END_BUTTON:
363 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S1_BUTTON:
364 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S2_BUTTON:
365 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S3_BUTTON:
366 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S4_BUTTON:
367 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S5_BUTTON:
368 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S6_BUTTON:
369 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S7_BUTTON:
370 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S8_BUTTON:
371 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S9_BUTTON:
372 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S10_BUTTON:
373 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S11_BUTTON:
374 	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S12_BUTTON:
375 	case RT8973A_MUIC_ADC_AUDIO_TYPE2:
376 		dev_warn(info->dev,
377 			"Audio device/button type (adc:0x%x)\n", cable_type);
378 		return 0;
379 	case RT8973A_MUIC_ADC_RESERVED_ACC_1:
380 	case RT8973A_MUIC_ADC_RESERVED_ACC_2:
381 	case RT8973A_MUIC_ADC_RESERVED_ACC_3:
382 	case RT8973A_MUIC_ADC_RESERVED_ACC_4:
383 	case RT8973A_MUIC_ADC_RESERVED_ACC_5:
384 	case RT8973A_MUIC_ADC_PHONE_POWERED_DEV:
385 		return 0;
386 	default:
387 		dev_err(info->dev,
388 			"Cannot handle this cable_type (adc:0x%x)\n",
389 			cable_type);
390 		return -EINVAL;
391 	}
392 
393 	/* Change internal hardware path(DM_CON/DP_CON) */
394 	ret = rt8973a_muic_set_path(info, con_sw, attached);
395 	if (ret < 0)
396 		return ret;
397 
398 	/* Change the state of external accessory */
399 	extcon_set_state_sync(info->edev, id, attached);
400 	if (id == EXTCON_USB)
401 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
402 					attached);
403 
404 	return 0;
405 }
406 
rt8973a_muic_irq_work(struct work_struct * work)407 static void rt8973a_muic_irq_work(struct work_struct *work)
408 {
409 	struct rt8973a_muic_info *info = container_of(work,
410 			struct rt8973a_muic_info, irq_work);
411 	int ret = 0;
412 
413 	if (!info->edev)
414 		return;
415 
416 	mutex_lock(&info->mutex);
417 
418 	/* Detect attached or detached cables */
419 	if (info->irq_attach) {
420 		ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);
421 		info->irq_attach = false;
422 	}
423 
424 	if (info->irq_detach) {
425 		ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_DETACH);
426 		info->irq_detach = false;
427 	}
428 
429 	if (info->irq_ovp) {
430 		ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OVP);
431 		info->irq_ovp = false;
432 	}
433 
434 	if (info->irq_otp) {
435 		ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OTP);
436 		info->irq_otp = false;
437 	}
438 
439 	if (ret < 0)
440 		dev_err(info->dev, "failed to handle MUIC interrupt\n");
441 
442 	mutex_unlock(&info->mutex);
443 }
444 
rt8973a_muic_irq_handler(int irq,void * data)445 static irqreturn_t rt8973a_muic_irq_handler(int irq, void *data)
446 {
447 	struct rt8973a_muic_info *info = data;
448 	int i, irq_type = -1;
449 
450 	for (i = 0; i < info->num_muic_irqs; i++)
451 		if (irq == info->muic_irqs[i].virq)
452 			irq_type = info->muic_irqs[i].irq;
453 
454 	switch (irq_type) {
455 	case RT8973A_INT1_ATTACH:
456 		info->irq_attach = true;
457 		break;
458 	case RT8973A_INT1_DETACH:
459 		info->irq_detach = true;
460 		break;
461 	case RT8973A_INT1_OVP:
462 		info->irq_ovp = true;
463 		break;
464 	case RT8973A_INT1_OTP:
465 		info->irq_otp = true;
466 		break;
467 	case RT8973A_INT1_CHGDET:
468 	case RT8973A_INT1_DCD_T:
469 	case RT8973A_INT1_CONNECT:
470 	case RT8973A_INT1_ADC_CHG:
471 	case RT8973A_INT2_UVLO:
472 	case RT8973A_INT2_POR:
473 	case RT8973A_INT2_OTP_FET:
474 	case RT8973A_INT2_OVP_FET:
475 	case RT8973A_INT2_OCP_LATCH:
476 	case RT8973A_INT2_OCP:
477 	case RT8973A_INT2_OVP_OCP:
478 	default:
479 		dev_dbg(info->dev,
480 			"Cannot handle this interrupt (%d)\n", irq_type);
481 		break;
482 	}
483 
484 	schedule_work(&info->irq_work);
485 
486 	return IRQ_HANDLED;
487 }
488 
rt8973a_muic_detect_cable_wq(struct work_struct * work)489 static void rt8973a_muic_detect_cable_wq(struct work_struct *work)
490 {
491 	struct rt8973a_muic_info *info = container_of(to_delayed_work(work),
492 				struct rt8973a_muic_info, wq_detcable);
493 	int ret;
494 
495 	/* Notify the state of connector cable or not  */
496 	ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);
497 	if (ret < 0)
498 		dev_warn(info->dev, "failed to detect cable state\n");
499 }
500 
rt8973a_init_dev_type(struct rt8973a_muic_info * info)501 static void rt8973a_init_dev_type(struct rt8973a_muic_info *info)
502 {
503 	unsigned int data, vendor_id, version_id;
504 	int i, ret;
505 
506 	/* To test I2C, Print version_id and vendor_id of RT8973A */
507 	ret = regmap_read(info->regmap, RT8973A_REG_DEVICE_ID, &data);
508 	if (ret) {
509 		dev_err(info->dev,
510 			"failed to read DEVICE_ID register: %d\n", ret);
511 		return;
512 	}
513 
514 	vendor_id = ((data & RT8973A_REG_DEVICE_ID_VENDOR_MASK) >>
515 				RT8973A_REG_DEVICE_ID_VENDOR_SHIFT);
516 	version_id = ((data & RT8973A_REG_DEVICE_ID_VERSION_MASK) >>
517 				RT8973A_REG_DEVICE_ID_VERSION_SHIFT);
518 
519 	dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
520 			    version_id, vendor_id);
521 
522 	/* Initiazle the register of RT8973A device to bring-up */
523 	for (i = 0; i < info->num_reg_data; i++) {
524 		u8 reg = info->reg_data[i].reg;
525 		u8 mask = info->reg_data[i].mask;
526 		u8 val = 0;
527 
528 		if (info->reg_data[i].invert)
529 			val = ~info->reg_data[i].val;
530 		else
531 			val = info->reg_data[i].val;
532 
533 		regmap_update_bits(info->regmap, reg, mask, val);
534 	}
535 
536 	/* Check whether RT8973A is auto switching mode or not */
537 	ret = regmap_read(info->regmap, RT8973A_REG_CONTROL1, &data);
538 	if (ret) {
539 		dev_err(info->dev,
540 			"failed to read CONTROL1 register: %d\n", ret);
541 		return;
542 	}
543 
544 	data &= RT8973A_REG_CONTROL1_AUTO_CONFIG_MASK;
545 	if (data) {
546 		info->auto_config = true;
547 		dev_info(info->dev,
548 			"Enable Auto-configuration for internal path\n");
549 	}
550 }
551 
rt8973a_muic_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)552 static int rt8973a_muic_i2c_probe(struct i2c_client *i2c,
553 				 const struct i2c_device_id *id)
554 {
555 	struct device_node *np = i2c->dev.of_node;
556 	struct rt8973a_muic_info *info;
557 	int i, ret, irq_flags;
558 
559 	if (!np)
560 		return -EINVAL;
561 
562 	info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
563 	if (!info)
564 		return -ENOMEM;
565 	i2c_set_clientdata(i2c, info);
566 
567 	info->dev = &i2c->dev;
568 	info->i2c = i2c;
569 	info->irq = i2c->irq;
570 	info->muic_irqs = rt8973a_muic_irqs;
571 	info->num_muic_irqs = ARRAY_SIZE(rt8973a_muic_irqs);
572 	info->reg_data = rt8973a_reg_data;
573 	info->num_reg_data = ARRAY_SIZE(rt8973a_reg_data);
574 
575 	mutex_init(&info->mutex);
576 
577 	INIT_WORK(&info->irq_work, rt8973a_muic_irq_work);
578 
579 	info->regmap = devm_regmap_init_i2c(i2c, &rt8973a_muic_regmap_config);
580 	if (IS_ERR(info->regmap)) {
581 		ret = PTR_ERR(info->regmap);
582 		dev_err(info->dev, "failed to allocate register map: %d\n",
583 				   ret);
584 		return ret;
585 	}
586 
587 	/* Support irq domain for RT8973A MUIC device */
588 	irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED;
589 	ret = regmap_add_irq_chip(info->regmap, info->irq, irq_flags, 0,
590 				  &rt8973a_muic_irq_chip, &info->irq_data);
591 	if (ret != 0) {
592 		dev_err(info->dev, "failed to add irq_chip (irq:%d, err:%d)\n",
593 				    info->irq, ret);
594 		return ret;
595 	}
596 
597 	for (i = 0; i < info->num_muic_irqs; i++) {
598 		struct muic_irq *muic_irq = &info->muic_irqs[i];
599 		int virq = 0;
600 
601 		virq = regmap_irq_get_virq(info->irq_data, muic_irq->irq);
602 		if (virq <= 0)
603 			return -EINVAL;
604 		muic_irq->virq = virq;
605 
606 		ret = devm_request_threaded_irq(info->dev, virq, NULL,
607 						rt8973a_muic_irq_handler,
608 						IRQF_NO_SUSPEND | IRQF_ONESHOT,
609 						muic_irq->name, info);
610 		if (ret) {
611 			dev_err(info->dev,
612 				"failed: irq request (IRQ: %d, error :%d)\n",
613 				muic_irq->irq, ret);
614 			return ret;
615 		}
616 	}
617 
618 	/* Allocate extcon device */
619 	info->edev = devm_extcon_dev_allocate(info->dev, rt8973a_extcon_cable);
620 	if (IS_ERR(info->edev)) {
621 		dev_err(info->dev, "failed to allocate memory for extcon\n");
622 		return -ENOMEM;
623 	}
624 
625 	/* Register extcon device */
626 	ret = devm_extcon_dev_register(info->dev, info->edev);
627 	if (ret) {
628 		dev_err(info->dev, "failed to register extcon device\n");
629 		return ret;
630 	}
631 
632 	/*
633 	 * Detect accessory after completing the initialization of platform
634 	 *
635 	 * - Use delayed workqueue to detect cable state and then
636 	 * notify cable state to notifiee/platform through uevent.
637 	 * After completing the booting of platform, the extcon provider
638 	 * driver should notify cable state to upper layer.
639 	 */
640 	INIT_DELAYED_WORK(&info->wq_detcable, rt8973a_muic_detect_cable_wq);
641 	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
642 			msecs_to_jiffies(DELAY_MS_DEFAULT));
643 
644 	/* Initialize RT8973A device and print vendor id and version id */
645 	rt8973a_init_dev_type(info);
646 
647 	return 0;
648 }
649 
rt8973a_muic_i2c_remove(struct i2c_client * i2c)650 static int rt8973a_muic_i2c_remove(struct i2c_client *i2c)
651 {
652 	struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
653 
654 	regmap_del_irq_chip(info->irq, info->irq_data);
655 
656 	return 0;
657 }
658 
659 static const struct of_device_id rt8973a_dt_match[] = {
660 	{ .compatible = "richtek,rt8973a-muic" },
661 	{ },
662 };
663 MODULE_DEVICE_TABLE(of, rt8973a_dt_match);
664 
665 #ifdef CONFIG_PM_SLEEP
rt8973a_muic_suspend(struct device * dev)666 static int rt8973a_muic_suspend(struct device *dev)
667 {
668 	struct i2c_client *i2c = to_i2c_client(dev);
669 	struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
670 
671 	enable_irq_wake(info->irq);
672 
673 	return 0;
674 }
675 
rt8973a_muic_resume(struct device * dev)676 static int rt8973a_muic_resume(struct device *dev)
677 {
678 	struct i2c_client *i2c = to_i2c_client(dev);
679 	struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
680 
681 	disable_irq_wake(info->irq);
682 
683 	return 0;
684 }
685 #endif
686 
687 static SIMPLE_DEV_PM_OPS(rt8973a_muic_pm_ops,
688 			 rt8973a_muic_suspend, rt8973a_muic_resume);
689 
690 static const struct i2c_device_id rt8973a_i2c_id[] = {
691 	{ "rt8973a", TYPE_RT8973A },
692 	{ }
693 };
694 MODULE_DEVICE_TABLE(i2c, rt8973a_i2c_id);
695 
696 static struct i2c_driver rt8973a_muic_i2c_driver = {
697 	.driver		= {
698 		.name	= "rt8973a",
699 		.pm	= &rt8973a_muic_pm_ops,
700 		.of_match_table = rt8973a_dt_match,
701 	},
702 	.probe	= rt8973a_muic_i2c_probe,
703 	.remove	= rt8973a_muic_i2c_remove,
704 	.id_table = rt8973a_i2c_id,
705 };
706 
rt8973a_muic_i2c_init(void)707 static int __init rt8973a_muic_i2c_init(void)
708 {
709 	return i2c_add_driver(&rt8973a_muic_i2c_driver);
710 }
711 subsys_initcall(rt8973a_muic_i2c_init);
712 
713 MODULE_DESCRIPTION("Richtek RT8973A Extcon driver");
714 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
715 MODULE_LICENSE("GPL");
716