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