1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Driver for Richtek RT9455WSC battery charger.
4  *
5  * Copyright (C) 2015 Intel Corporation
6  */
7 
8 #include <linux/module.h>
9 #include <linux/interrupt.h>
10 #include <linux/delay.h>
11 #include <linux/of_irq.h>
12 #include <linux/of_device.h>
13 #include <linux/pm_runtime.h>
14 #include <linux/power_supply.h>
15 #include <linux/i2c.h>
16 #include <linux/acpi.h>
17 #include <linux/usb/phy.h>
18 #include <linux/regmap.h>
19 
20 #define RT9455_MANUFACTURER			"Richtek"
21 #define RT9455_MODEL_NAME			"RT9455"
22 #define RT9455_DRIVER_NAME			"rt9455-charger"
23 
24 #define RT9455_IRQ_NAME				"interrupt"
25 
26 #define RT9455_PWR_RDY_DELAY			1 /* 1 second */
27 #define RT9455_MAX_CHARGING_TIME		21600 /* 6 hrs */
28 #define RT9455_BATT_PRESENCE_DELAY		60 /* 60 seconds */
29 
30 #define RT9455_CHARGE_MODE			0x00
31 #define RT9455_BOOST_MODE			0x01
32 
33 #define RT9455_FAULT				0x03
34 
35 #define RT9455_IAICR_100MA			0x00
36 #define RT9455_IAICR_500MA			0x01
37 #define RT9455_IAICR_NO_LIMIT			0x03
38 
39 #define RT9455_CHARGE_DISABLE			0x00
40 #define RT9455_CHARGE_ENABLE			0x01
41 
42 #define RT9455_PWR_FAULT			0x00
43 #define RT9455_PWR_GOOD				0x01
44 
45 #define RT9455_REG_CTRL1			0x00 /* CTRL1 reg address */
46 #define RT9455_REG_CTRL2			0x01 /* CTRL2 reg address */
47 #define RT9455_REG_CTRL3			0x02 /* CTRL3 reg address */
48 #define RT9455_REG_DEV_ID			0x03 /* DEV_ID reg address */
49 #define RT9455_REG_CTRL4			0x04 /* CTRL4 reg address */
50 #define RT9455_REG_CTRL5			0x05 /* CTRL5 reg address */
51 #define RT9455_REG_CTRL6			0x06 /* CTRL6 reg address */
52 #define RT9455_REG_CTRL7			0x07 /* CTRL7 reg address */
53 #define RT9455_REG_IRQ1				0x08 /* IRQ1 reg address */
54 #define RT9455_REG_IRQ2				0x09 /* IRQ2 reg address */
55 #define RT9455_REG_IRQ3				0x0A /* IRQ3 reg address */
56 #define RT9455_REG_MASK1			0x0B /* MASK1 reg address */
57 #define RT9455_REG_MASK2			0x0C /* MASK2 reg address */
58 #define RT9455_REG_MASK3			0x0D /* MASK3 reg address */
59 
60 enum rt9455_fields {
61 	F_STAT, F_BOOST, F_PWR_RDY, F_OTG_PIN_POLARITY, /* CTRL1 reg fields */
62 
63 	F_IAICR, F_TE_SHDN_EN, F_HIGHER_OCP, F_TE, F_IAICR_INT, F_HIZ,
64 	F_OPA_MODE, /* CTRL2 reg fields */
65 
66 	F_VOREG, F_OTG_PL, F_OTG_EN, /* CTRL3 reg fields */
67 
68 	F_VENDOR_ID, F_CHIP_REV, /* DEV_ID reg fields */
69 
70 	F_RST, /* CTRL4 reg fields */
71 
72 	F_TMR_EN, F_MIVR, F_IPREC, F_IEOC_PERCENTAGE, /* CTRL5 reg fields*/
73 
74 	F_IAICR_SEL, F_ICHRG, F_VPREC, /* CTRL6 reg fields */
75 
76 	F_BATD_EN, F_CHG_EN, F_VMREG, /* CTRL7 reg fields */
77 
78 	F_TSDI, F_VINOVPI, F_BATAB, /* IRQ1 reg fields */
79 
80 	F_CHRVPI, F_CHBATOVI, F_CHTERMI, F_CHRCHGI, F_CH32MI, F_CHTREGI,
81 	F_CHMIVRI, /* IRQ2 reg fields */
82 
83 	F_BSTBUSOVI, F_BSTOLI, F_BSTLOWVI, F_BST32SI, /* IRQ3 reg fields */
84 
85 	F_TSDM, F_VINOVPIM, F_BATABM, /* MASK1 reg fields */
86 
87 	F_CHRVPIM, F_CHBATOVIM, F_CHTERMIM, F_CHRCHGIM, F_CH32MIM, F_CHTREGIM,
88 	F_CHMIVRIM, /* MASK2 reg fields */
89 
90 	F_BSTVINOVIM, F_BSTOLIM, F_BSTLOWVIM, F_BST32SIM, /* MASK3 reg fields */
91 
92 	F_MAX_FIELDS
93 };
94 
95 static const struct reg_field rt9455_reg_fields[] = {
96 	[F_STAT]		= REG_FIELD(RT9455_REG_CTRL1, 4, 5),
97 	[F_BOOST]		= REG_FIELD(RT9455_REG_CTRL1, 3, 3),
98 	[F_PWR_RDY]		= REG_FIELD(RT9455_REG_CTRL1, 2, 2),
99 	[F_OTG_PIN_POLARITY]	= REG_FIELD(RT9455_REG_CTRL1, 1, 1),
100 
101 	[F_IAICR]		= REG_FIELD(RT9455_REG_CTRL2, 6, 7),
102 	[F_TE_SHDN_EN]		= REG_FIELD(RT9455_REG_CTRL2, 5, 5),
103 	[F_HIGHER_OCP]		= REG_FIELD(RT9455_REG_CTRL2, 4, 4),
104 	[F_TE]			= REG_FIELD(RT9455_REG_CTRL2, 3, 3),
105 	[F_IAICR_INT]		= REG_FIELD(RT9455_REG_CTRL2, 2, 2),
106 	[F_HIZ]			= REG_FIELD(RT9455_REG_CTRL2, 1, 1),
107 	[F_OPA_MODE]		= REG_FIELD(RT9455_REG_CTRL2, 0, 0),
108 
109 	[F_VOREG]		= REG_FIELD(RT9455_REG_CTRL3, 2, 7),
110 	[F_OTG_PL]		= REG_FIELD(RT9455_REG_CTRL3, 1, 1),
111 	[F_OTG_EN]		= REG_FIELD(RT9455_REG_CTRL3, 0, 0),
112 
113 	[F_VENDOR_ID]		= REG_FIELD(RT9455_REG_DEV_ID, 4, 7),
114 	[F_CHIP_REV]		= REG_FIELD(RT9455_REG_DEV_ID, 0, 3),
115 
116 	[F_RST]			= REG_FIELD(RT9455_REG_CTRL4, 7, 7),
117 
118 	[F_TMR_EN]		= REG_FIELD(RT9455_REG_CTRL5, 7, 7),
119 	[F_MIVR]		= REG_FIELD(RT9455_REG_CTRL5, 4, 5),
120 	[F_IPREC]		= REG_FIELD(RT9455_REG_CTRL5, 2, 3),
121 	[F_IEOC_PERCENTAGE]	= REG_FIELD(RT9455_REG_CTRL5, 0, 1),
122 
123 	[F_IAICR_SEL]		= REG_FIELD(RT9455_REG_CTRL6, 7, 7),
124 	[F_ICHRG]		= REG_FIELD(RT9455_REG_CTRL6, 4, 6),
125 	[F_VPREC]		= REG_FIELD(RT9455_REG_CTRL6, 0, 2),
126 
127 	[F_BATD_EN]		= REG_FIELD(RT9455_REG_CTRL7, 6, 6),
128 	[F_CHG_EN]		= REG_FIELD(RT9455_REG_CTRL7, 4, 4),
129 	[F_VMREG]		= REG_FIELD(RT9455_REG_CTRL7, 0, 3),
130 
131 	[F_TSDI]		= REG_FIELD(RT9455_REG_IRQ1, 7, 7),
132 	[F_VINOVPI]		= REG_FIELD(RT9455_REG_IRQ1, 6, 6),
133 	[F_BATAB]		= REG_FIELD(RT9455_REG_IRQ1, 0, 0),
134 
135 	[F_CHRVPI]		= REG_FIELD(RT9455_REG_IRQ2, 7, 7),
136 	[F_CHBATOVI]		= REG_FIELD(RT9455_REG_IRQ2, 5, 5),
137 	[F_CHTERMI]		= REG_FIELD(RT9455_REG_IRQ2, 4, 4),
138 	[F_CHRCHGI]		= REG_FIELD(RT9455_REG_IRQ2, 3, 3),
139 	[F_CH32MI]		= REG_FIELD(RT9455_REG_IRQ2, 2, 2),
140 	[F_CHTREGI]		= REG_FIELD(RT9455_REG_IRQ2, 1, 1),
141 	[F_CHMIVRI]		= REG_FIELD(RT9455_REG_IRQ2, 0, 0),
142 
143 	[F_BSTBUSOVI]		= REG_FIELD(RT9455_REG_IRQ3, 7, 7),
144 	[F_BSTOLI]		= REG_FIELD(RT9455_REG_IRQ3, 6, 6),
145 	[F_BSTLOWVI]		= REG_FIELD(RT9455_REG_IRQ3, 5, 5),
146 	[F_BST32SI]		= REG_FIELD(RT9455_REG_IRQ3, 3, 3),
147 
148 	[F_TSDM]		= REG_FIELD(RT9455_REG_MASK1, 7, 7),
149 	[F_VINOVPIM]		= REG_FIELD(RT9455_REG_MASK1, 6, 6),
150 	[F_BATABM]		= REG_FIELD(RT9455_REG_MASK1, 0, 0),
151 
152 	[F_CHRVPIM]		= REG_FIELD(RT9455_REG_MASK2, 7, 7),
153 	[F_CHBATOVIM]		= REG_FIELD(RT9455_REG_MASK2, 5, 5),
154 	[F_CHTERMIM]		= REG_FIELD(RT9455_REG_MASK2, 4, 4),
155 	[F_CHRCHGIM]		= REG_FIELD(RT9455_REG_MASK2, 3, 3),
156 	[F_CH32MIM]		= REG_FIELD(RT9455_REG_MASK2, 2, 2),
157 	[F_CHTREGIM]		= REG_FIELD(RT9455_REG_MASK2, 1, 1),
158 	[F_CHMIVRIM]		= REG_FIELD(RT9455_REG_MASK2, 0, 0),
159 
160 	[F_BSTVINOVIM]		= REG_FIELD(RT9455_REG_MASK3, 7, 7),
161 	[F_BSTOLIM]		= REG_FIELD(RT9455_REG_MASK3, 6, 6),
162 	[F_BSTLOWVIM]		= REG_FIELD(RT9455_REG_MASK3, 5, 5),
163 	[F_BST32SIM]		= REG_FIELD(RT9455_REG_MASK3, 3, 3),
164 };
165 
166 #define GET_MASK(fid)	(BIT(rt9455_reg_fields[fid].msb + 1) - \
167 			 BIT(rt9455_reg_fields[fid].lsb))
168 
169 /*
170  * Each array initialised below shows the possible real-world values for a
171  * group of bits belonging to RT9455 registers. The arrays are sorted in
172  * ascending order. The index of each real-world value represents the value
173  * that is encoded in the group of bits belonging to RT9455 registers.
174  */
175 /* REG06[6:4] (ICHRG) in uAh */
176 static const int rt9455_ichrg_values[] = {
177 	 500000,  650000,  800000,  950000, 1100000, 1250000, 1400000, 1550000
178 };
179 
180 /*
181  * When the charger is in charge mode, REG02[7:2] represent battery regulation
182  * voltage.
183  */
184 /* REG02[7:2] (VOREG) in uV */
185 static const int rt9455_voreg_values[] = {
186 	3500000, 3520000, 3540000, 3560000, 3580000, 3600000, 3620000, 3640000,
187 	3660000, 3680000, 3700000, 3720000, 3740000, 3760000, 3780000, 3800000,
188 	3820000, 3840000, 3860000, 3880000, 3900000, 3920000, 3940000, 3960000,
189 	3980000, 4000000, 4020000, 4040000, 4060000, 4080000, 4100000, 4120000,
190 	4140000, 4160000, 4180000, 4200000, 4220000, 4240000, 4260000, 4280000,
191 	4300000, 4330000, 4350000, 4370000, 4390000, 4410000, 4430000, 4450000,
192 	4450000, 4450000, 4450000, 4450000, 4450000, 4450000, 4450000, 4450000,
193 	4450000, 4450000, 4450000, 4450000, 4450000, 4450000, 4450000, 4450000
194 };
195 
196 /*
197  * When the charger is in boost mode, REG02[7:2] represent boost output
198  * voltage.
199  */
200 /* REG02[7:2] (Boost output voltage) in uV */
201 static const int rt9455_boost_voltage_values[] = {
202 	4425000, 4450000, 4475000, 4500000, 4525000, 4550000, 4575000, 4600000,
203 	4625000, 4650000, 4675000, 4700000, 4725000, 4750000, 4775000, 4800000,
204 	4825000, 4850000, 4875000, 4900000, 4925000, 4950000, 4975000, 5000000,
205 	5025000, 5050000, 5075000, 5100000, 5125000, 5150000, 5175000, 5200000,
206 	5225000, 5250000, 5275000, 5300000, 5325000, 5350000, 5375000, 5400000,
207 	5425000, 5450000, 5475000, 5500000, 5525000, 5550000, 5575000, 5600000,
208 	5600000, 5600000, 5600000, 5600000, 5600000, 5600000, 5600000, 5600000,
209 	5600000, 5600000, 5600000, 5600000, 5600000, 5600000, 5600000, 5600000,
210 };
211 
212 /* REG07[3:0] (VMREG) in uV */
213 static const int rt9455_vmreg_values[] = {
214 	4200000, 4220000, 4240000, 4260000, 4280000, 4300000, 4320000, 4340000,
215 	4360000, 4380000, 4400000, 4430000, 4450000, 4450000, 4450000, 4450000
216 };
217 
218 /* REG05[5:4] (IEOC_PERCENTAGE) */
219 static const int rt9455_ieoc_percentage_values[] = {
220 	10, 30, 20, 30
221 };
222 
223 /* REG05[1:0] (MIVR) in uV */
224 static const int rt9455_mivr_values[] = {
225 	4000000, 4250000, 4500000, 5000000
226 };
227 
228 /* REG05[1:0] (IAICR) in uA */
229 static const int rt9455_iaicr_values[] = {
230 	100000, 500000, 1000000, 2000000
231 };
232 
233 struct rt9455_info {
234 	struct i2c_client		*client;
235 	struct regmap			*regmap;
236 	struct regmap_field		*regmap_fields[F_MAX_FIELDS];
237 	struct power_supply		*charger;
238 #if IS_ENABLED(CONFIG_USB_PHY)
239 	struct usb_phy			*usb_phy;
240 	struct notifier_block		nb;
241 #endif
242 	struct delayed_work		pwr_rdy_work;
243 	struct delayed_work		max_charging_time_work;
244 	struct delayed_work		batt_presence_work;
245 	u32				voreg;
246 	u32				boost_voltage;
247 };
248 
249 /*
250  * Iterate through each element of the 'tbl' array until an element whose value
251  * is greater than v is found. Return the index of the respective element,
252  * or the index of the last element in the array, if no such element is found.
253  */
254 static unsigned int rt9455_find_idx(const int tbl[], int tbl_size, int v)
255 {
256 	int i;
257 
258 	/*
259 	 * No need to iterate until the last index in the table because
260 	 * if no element greater than v is found in the table,
261 	 * or if only the last element is greater than v,
262 	 * function returns the index of the last element.
263 	 */
264 	for (i = 0; i < tbl_size - 1; i++)
265 		if (v <= tbl[i])
266 			return i;
267 
268 	return (tbl_size - 1);
269 }
270 
271 static int rt9455_get_field_val(struct rt9455_info *info,
272 				enum rt9455_fields field,
273 				const int tbl[], int tbl_size, int *val)
274 {
275 	unsigned int v;
276 	int ret;
277 
278 	ret = regmap_field_read(info->regmap_fields[field], &v);
279 	if (ret)
280 		return ret;
281 
282 	v = (v >= tbl_size) ? (tbl_size - 1) : v;
283 	*val = tbl[v];
284 
285 	return 0;
286 }
287 
288 static int rt9455_set_field_val(struct rt9455_info *info,
289 				enum rt9455_fields field,
290 				const int tbl[], int tbl_size, int val)
291 {
292 	unsigned int idx = rt9455_find_idx(tbl, tbl_size, val);
293 
294 	return regmap_field_write(info->regmap_fields[field], idx);
295 }
296 
297 static int rt9455_register_reset(struct rt9455_info *info)
298 {
299 	struct device *dev = &info->client->dev;
300 	unsigned int v;
301 	int ret, limit = 100;
302 
303 	ret = regmap_field_write(info->regmap_fields[F_RST], 0x01);
304 	if (ret) {
305 		dev_err(dev, "Failed to set RST bit\n");
306 		return ret;
307 	}
308 
309 	/*
310 	 * To make sure that reset operation has finished, loop until RST bit
311 	 * is set to 0.
312 	 */
313 	do {
314 		ret = regmap_field_read(info->regmap_fields[F_RST], &v);
315 		if (ret) {
316 			dev_err(dev, "Failed to read RST bit\n");
317 			return ret;
318 		}
319 
320 		if (!v)
321 			break;
322 
323 		usleep_range(10, 100);
324 	} while (--limit);
325 
326 	if (!limit)
327 		return -EIO;
328 
329 	return 0;
330 }
331 
332 /* Charger power supply property routines */
333 static enum power_supply_property rt9455_charger_properties[] = {
334 	POWER_SUPPLY_PROP_STATUS,
335 	POWER_SUPPLY_PROP_HEALTH,
336 	POWER_SUPPLY_PROP_PRESENT,
337 	POWER_SUPPLY_PROP_ONLINE,
338 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
339 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
340 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
341 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
342 	POWER_SUPPLY_PROP_SCOPE,
343 	POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
344 	POWER_SUPPLY_PROP_MODEL_NAME,
345 	POWER_SUPPLY_PROP_MANUFACTURER,
346 };
347 
348 static char *rt9455_charger_supplied_to[] = {
349 	"main-battery",
350 };
351 
352 static int rt9455_charger_get_status(struct rt9455_info *info,
353 				     union power_supply_propval *val)
354 {
355 	unsigned int v, pwr_rdy;
356 	int ret;
357 
358 	ret = regmap_field_read(info->regmap_fields[F_PWR_RDY],
359 				&pwr_rdy);
360 	if (ret) {
361 		dev_err(&info->client->dev, "Failed to read PWR_RDY bit\n");
362 		return ret;
363 	}
364 
365 	/*
366 	 * If PWR_RDY bit is unset, the battery is discharging. Otherwise,
367 	 * STAT bits value must be checked.
368 	 */
369 	if (!pwr_rdy) {
370 		val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
371 		return 0;
372 	}
373 
374 	ret = regmap_field_read(info->regmap_fields[F_STAT], &v);
375 	if (ret) {
376 		dev_err(&info->client->dev, "Failed to read STAT bits\n");
377 		return ret;
378 	}
379 
380 	switch (v) {
381 	case 0:
382 		/*
383 		 * If PWR_RDY bit is set, but STAT bits value is 0, the charger
384 		 * may be in one of the following cases:
385 		 * 1. CHG_EN bit is 0.
386 		 * 2. CHG_EN bit is 1 but the battery is not connected.
387 		 * In any of these cases, POWER_SUPPLY_STATUS_NOT_CHARGING is
388 		 * returned.
389 		 */
390 		val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
391 		return 0;
392 	case 1:
393 		val->intval = POWER_SUPPLY_STATUS_CHARGING;
394 		return 0;
395 	case 2:
396 		val->intval = POWER_SUPPLY_STATUS_FULL;
397 		return 0;
398 	default:
399 		val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
400 		return 0;
401 	}
402 }
403 
404 static int rt9455_charger_get_health(struct rt9455_info *info,
405 				     union power_supply_propval *val)
406 {
407 	struct device *dev = &info->client->dev;
408 	unsigned int v;
409 	int ret;
410 
411 	val->intval = POWER_SUPPLY_HEALTH_GOOD;
412 
413 	ret = regmap_read(info->regmap, RT9455_REG_IRQ1, &v);
414 	if (ret) {
415 		dev_err(dev, "Failed to read IRQ1 register\n");
416 		return ret;
417 	}
418 
419 	if (v & GET_MASK(F_TSDI)) {
420 		val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
421 		return 0;
422 	}
423 	if (v & GET_MASK(F_VINOVPI)) {
424 		val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
425 		return 0;
426 	}
427 	if (v & GET_MASK(F_BATAB)) {
428 		val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
429 		return 0;
430 	}
431 
432 	ret = regmap_read(info->regmap, RT9455_REG_IRQ2, &v);
433 	if (ret) {
434 		dev_err(dev, "Failed to read IRQ2 register\n");
435 		return ret;
436 	}
437 
438 	if (v & GET_MASK(F_CHBATOVI)) {
439 		val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
440 		return 0;
441 	}
442 	if (v & GET_MASK(F_CH32MI)) {
443 		val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
444 		return 0;
445 	}
446 
447 	ret = regmap_read(info->regmap, RT9455_REG_IRQ3, &v);
448 	if (ret) {
449 		dev_err(dev, "Failed to read IRQ3 register\n");
450 		return ret;
451 	}
452 
453 	if (v & GET_MASK(F_BSTBUSOVI)) {
454 		val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
455 		return 0;
456 	}
457 	if (v & GET_MASK(F_BSTOLI)) {
458 		val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
459 		return 0;
460 	}
461 	if (v & GET_MASK(F_BSTLOWVI)) {
462 		val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
463 		return 0;
464 	}
465 	if (v & GET_MASK(F_BST32SI)) {
466 		val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
467 		return 0;
468 	}
469 
470 	ret = regmap_field_read(info->regmap_fields[F_STAT], &v);
471 	if (ret) {
472 		dev_err(dev, "Failed to read STAT bits\n");
473 		return ret;
474 	}
475 
476 	if (v == RT9455_FAULT) {
477 		val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
478 		return 0;
479 	}
480 
481 	return 0;
482 }
483 
484 static int rt9455_charger_get_battery_presence(struct rt9455_info *info,
485 					       union power_supply_propval *val)
486 {
487 	unsigned int v;
488 	int ret;
489 
490 	ret = regmap_field_read(info->regmap_fields[F_BATAB], &v);
491 	if (ret) {
492 		dev_err(&info->client->dev, "Failed to read BATAB bit\n");
493 		return ret;
494 	}
495 
496 	/*
497 	 * Since BATAB is 1 when battery is NOT present and 0 otherwise,
498 	 * !BATAB is returned.
499 	 */
500 	val->intval = !v;
501 
502 	return 0;
503 }
504 
505 static int rt9455_charger_get_online(struct rt9455_info *info,
506 				     union power_supply_propval *val)
507 {
508 	unsigned int v;
509 	int ret;
510 
511 	ret = regmap_field_read(info->regmap_fields[F_PWR_RDY], &v);
512 	if (ret) {
513 		dev_err(&info->client->dev, "Failed to read PWR_RDY bit\n");
514 		return ret;
515 	}
516 
517 	val->intval = (int)v;
518 
519 	return 0;
520 }
521 
522 static int rt9455_charger_get_current(struct rt9455_info *info,
523 				      union power_supply_propval *val)
524 {
525 	int curr;
526 	int ret;
527 
528 	ret = rt9455_get_field_val(info, F_ICHRG,
529 				   rt9455_ichrg_values,
530 				   ARRAY_SIZE(rt9455_ichrg_values),
531 				   &curr);
532 	if (ret) {
533 		dev_err(&info->client->dev, "Failed to read ICHRG value\n");
534 		return ret;
535 	}
536 
537 	val->intval = curr;
538 
539 	return 0;
540 }
541 
542 static int rt9455_charger_get_current_max(struct rt9455_info *info,
543 					  union power_supply_propval *val)
544 {
545 	int idx = ARRAY_SIZE(rt9455_ichrg_values) - 1;
546 
547 	val->intval = rt9455_ichrg_values[idx];
548 
549 	return 0;
550 }
551 
552 static int rt9455_charger_get_voltage(struct rt9455_info *info,
553 				      union power_supply_propval *val)
554 {
555 	int voltage;
556 	int ret;
557 
558 	ret = rt9455_get_field_val(info, F_VOREG,
559 				   rt9455_voreg_values,
560 				   ARRAY_SIZE(rt9455_voreg_values),
561 				   &voltage);
562 	if (ret) {
563 		dev_err(&info->client->dev, "Failed to read VOREG value\n");
564 		return ret;
565 	}
566 
567 	val->intval = voltage;
568 
569 	return 0;
570 }
571 
572 static int rt9455_charger_get_voltage_max(struct rt9455_info *info,
573 					  union power_supply_propval *val)
574 {
575 	int idx = ARRAY_SIZE(rt9455_vmreg_values) - 1;
576 
577 	val->intval = rt9455_vmreg_values[idx];
578 
579 	return 0;
580 }
581 
582 static int rt9455_charger_get_term_current(struct rt9455_info *info,
583 					   union power_supply_propval *val)
584 {
585 	struct device *dev = &info->client->dev;
586 	int ichrg, ieoc_percentage, ret;
587 
588 	ret = rt9455_get_field_val(info, F_ICHRG,
589 				   rt9455_ichrg_values,
590 				   ARRAY_SIZE(rt9455_ichrg_values),
591 				   &ichrg);
592 	if (ret) {
593 		dev_err(dev, "Failed to read ICHRG value\n");
594 		return ret;
595 	}
596 
597 	ret = rt9455_get_field_val(info, F_IEOC_PERCENTAGE,
598 				   rt9455_ieoc_percentage_values,
599 				   ARRAY_SIZE(rt9455_ieoc_percentage_values),
600 				   &ieoc_percentage);
601 	if (ret) {
602 		dev_err(dev, "Failed to read IEOC value\n");
603 		return ret;
604 	}
605 
606 	val->intval = ichrg * ieoc_percentage / 100;
607 
608 	return 0;
609 }
610 
611 static int rt9455_charger_get_property(struct power_supply *psy,
612 				       enum power_supply_property psp,
613 				       union power_supply_propval *val)
614 {
615 	struct rt9455_info *info = power_supply_get_drvdata(psy);
616 
617 	switch (psp) {
618 	case POWER_SUPPLY_PROP_STATUS:
619 		return rt9455_charger_get_status(info, val);
620 	case POWER_SUPPLY_PROP_HEALTH:
621 		return rt9455_charger_get_health(info, val);
622 	case POWER_SUPPLY_PROP_PRESENT:
623 		return rt9455_charger_get_battery_presence(info, val);
624 	case POWER_SUPPLY_PROP_ONLINE:
625 		return rt9455_charger_get_online(info, val);
626 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
627 		return rt9455_charger_get_current(info, val);
628 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
629 		return rt9455_charger_get_current_max(info, val);
630 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
631 		return rt9455_charger_get_voltage(info, val);
632 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
633 		return rt9455_charger_get_voltage_max(info, val);
634 	case POWER_SUPPLY_PROP_SCOPE:
635 		val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
636 		return 0;
637 	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
638 		return rt9455_charger_get_term_current(info, val);
639 	case POWER_SUPPLY_PROP_MODEL_NAME:
640 		val->strval = RT9455_MODEL_NAME;
641 		return 0;
642 	case POWER_SUPPLY_PROP_MANUFACTURER:
643 		val->strval = RT9455_MANUFACTURER;
644 		return 0;
645 	default:
646 		return -ENODATA;
647 	}
648 }
649 
650 static int rt9455_hw_init(struct rt9455_info *info, u32 ichrg,
651 			  u32 ieoc_percentage,
652 			  u32 mivr, u32 iaicr)
653 {
654 	struct device *dev = &info->client->dev;
655 	int idx, ret;
656 
657 	ret = rt9455_register_reset(info);
658 	if (ret) {
659 		dev_err(dev, "Power On Reset failed\n");
660 		return ret;
661 	}
662 
663 	/* Set TE bit in order to enable end of charge detection */
664 	ret = regmap_field_write(info->regmap_fields[F_TE], 1);
665 	if (ret) {
666 		dev_err(dev, "Failed to set TE bit\n");
667 		return ret;
668 	}
669 
670 	/* Set TE_SHDN_EN bit in order to enable end of charge detection */
671 	ret = regmap_field_write(info->regmap_fields[F_TE_SHDN_EN], 1);
672 	if (ret) {
673 		dev_err(dev, "Failed to set TE_SHDN_EN bit\n");
674 		return ret;
675 	}
676 
677 	/*
678 	 * Set BATD_EN bit in order to enable battery detection
679 	 * when charging is done
680 	 */
681 	ret = regmap_field_write(info->regmap_fields[F_BATD_EN], 1);
682 	if (ret) {
683 		dev_err(dev, "Failed to set BATD_EN bit\n");
684 		return ret;
685 	}
686 
687 	/*
688 	 * Disable Safety Timer. In charge mode, this timer terminates charging
689 	 * if no read or write via I2C is done within 32 minutes. This timer
690 	 * avoids overcharging the baterry when the OS is not loaded and the
691 	 * charger is connected to a power source.
692 	 * In boost mode, this timer triggers BST32SI interrupt if no read or
693 	 * write via I2C is done within 32 seconds.
694 	 * When the OS is loaded and the charger driver is inserted, it is used
695 	 * delayed_work, named max_charging_time_work, to avoid overcharging
696 	 * the battery.
697 	 */
698 	ret = regmap_field_write(info->regmap_fields[F_TMR_EN], 0x00);
699 	if (ret) {
700 		dev_err(dev, "Failed to disable Safety Timer\n");
701 		return ret;
702 	}
703 
704 	/* Set ICHRG to value retrieved from device-specific data */
705 	ret = rt9455_set_field_val(info, F_ICHRG,
706 				   rt9455_ichrg_values,
707 				   ARRAY_SIZE(rt9455_ichrg_values), ichrg);
708 	if (ret) {
709 		dev_err(dev, "Failed to set ICHRG value\n");
710 		return ret;
711 	}
712 
713 	/* Set IEOC Percentage to value retrieved from device-specific data */
714 	ret = rt9455_set_field_val(info, F_IEOC_PERCENTAGE,
715 				   rt9455_ieoc_percentage_values,
716 				   ARRAY_SIZE(rt9455_ieoc_percentage_values),
717 				   ieoc_percentage);
718 	if (ret) {
719 		dev_err(dev, "Failed to set IEOC Percentage value\n");
720 		return ret;
721 	}
722 
723 	/* Set VOREG to value retrieved from device-specific data */
724 	ret = rt9455_set_field_val(info, F_VOREG,
725 				   rt9455_voreg_values,
726 				   ARRAY_SIZE(rt9455_voreg_values),
727 				   info->voreg);
728 	if (ret) {
729 		dev_err(dev, "Failed to set VOREG value\n");
730 		return ret;
731 	}
732 
733 	/* Set VMREG value to maximum (4.45V). */
734 	idx = ARRAY_SIZE(rt9455_vmreg_values) - 1;
735 	ret = rt9455_set_field_val(info, F_VMREG,
736 				   rt9455_vmreg_values,
737 				   ARRAY_SIZE(rt9455_vmreg_values),
738 				   rt9455_vmreg_values[idx]);
739 	if (ret) {
740 		dev_err(dev, "Failed to set VMREG value\n");
741 		return ret;
742 	}
743 
744 	/*
745 	 * Set MIVR to value retrieved from device-specific data.
746 	 * If no value is specified, default value for MIVR is 4.5V.
747 	 */
748 	if (mivr == -1)
749 		mivr = 4500000;
750 
751 	ret = rt9455_set_field_val(info, F_MIVR,
752 				   rt9455_mivr_values,
753 				   ARRAY_SIZE(rt9455_mivr_values), mivr);
754 	if (ret) {
755 		dev_err(dev, "Failed to set MIVR value\n");
756 		return ret;
757 	}
758 
759 	/*
760 	 * Set IAICR to value retrieved from device-specific data.
761 	 * If no value is specified, default value for IAICR is 500 mA.
762 	 */
763 	if (iaicr == -1)
764 		iaicr = 500000;
765 
766 	ret = rt9455_set_field_val(info, F_IAICR,
767 				   rt9455_iaicr_values,
768 				   ARRAY_SIZE(rt9455_iaicr_values), iaicr);
769 	if (ret) {
770 		dev_err(dev, "Failed to set IAICR value\n");
771 		return ret;
772 	}
773 
774 	/*
775 	 * Set IAICR_INT bit so that IAICR value is determined by IAICR bits
776 	 * and not by OTG pin.
777 	 */
778 	ret = regmap_field_write(info->regmap_fields[F_IAICR_INT], 0x01);
779 	if (ret) {
780 		dev_err(dev, "Failed to set IAICR_INT bit\n");
781 		return ret;
782 	}
783 
784 	/*
785 	 * Disable CHMIVRI interrupt. Because the driver sets MIVR value,
786 	 * CHMIVRI is triggered, but there is no action to be taken by the
787 	 * driver when CHMIVRI is triggered.
788 	 */
789 	ret = regmap_field_write(info->regmap_fields[F_CHMIVRIM], 0x01);
790 	if (ret) {
791 		dev_err(dev, "Failed to mask CHMIVRI interrupt\n");
792 		return ret;
793 	}
794 
795 	return 0;
796 }
797 
798 #if IS_ENABLED(CONFIG_USB_PHY)
799 /*
800  * Before setting the charger into boost mode, boost output voltage is
801  * set. This is needed because boost output voltage may differ from battery
802  * regulation voltage. F_VOREG bits represent either battery regulation voltage
803  * or boost output voltage, depending on the mode the charger is. Both battery
804  * regulation voltage and boost output voltage are read from DT/ACPI during
805  * probe.
806  */
807 static int rt9455_set_boost_voltage_before_boost_mode(struct rt9455_info *info)
808 {
809 	struct device *dev = &info->client->dev;
810 	int ret;
811 
812 	ret = rt9455_set_field_val(info, F_VOREG,
813 				   rt9455_boost_voltage_values,
814 				   ARRAY_SIZE(rt9455_boost_voltage_values),
815 				   info->boost_voltage);
816 	if (ret) {
817 		dev_err(dev, "Failed to set boost output voltage value\n");
818 		return ret;
819 	}
820 
821 	return 0;
822 }
823 #endif
824 
825 /*
826  * Before setting the charger into charge mode, battery regulation voltage is
827  * set. This is needed because boost output voltage may differ from battery
828  * regulation voltage. F_VOREG bits represent either battery regulation voltage
829  * or boost output voltage, depending on the mode the charger is. Both battery
830  * regulation voltage and boost output voltage are read from DT/ACPI during
831  * probe.
832  */
833 static int rt9455_set_voreg_before_charge_mode(struct rt9455_info *info)
834 {
835 	struct device *dev = &info->client->dev;
836 	int ret;
837 
838 	ret = rt9455_set_field_val(info, F_VOREG,
839 				   rt9455_voreg_values,
840 				   ARRAY_SIZE(rt9455_voreg_values),
841 				   info->voreg);
842 	if (ret) {
843 		dev_err(dev, "Failed to set VOREG value\n");
844 		return ret;
845 	}
846 
847 	return 0;
848 }
849 
850 static int rt9455_irq_handler_check_irq1_register(struct rt9455_info *info,
851 						  bool *_is_battery_absent,
852 						  bool *_alert_userspace)
853 {
854 	unsigned int irq1, mask1, mask2;
855 	struct device *dev = &info->client->dev;
856 	bool is_battery_absent = false;
857 	bool alert_userspace = false;
858 	int ret;
859 
860 	ret = regmap_read(info->regmap, RT9455_REG_IRQ1, &irq1);
861 	if (ret) {
862 		dev_err(dev, "Failed to read IRQ1 register\n");
863 		return ret;
864 	}
865 
866 	ret = regmap_read(info->regmap, RT9455_REG_MASK1, &mask1);
867 	if (ret) {
868 		dev_err(dev, "Failed to read MASK1 register\n");
869 		return ret;
870 	}
871 
872 	if (irq1 & GET_MASK(F_TSDI)) {
873 		dev_err(dev, "Thermal shutdown fault occurred\n");
874 		alert_userspace = true;
875 	}
876 
877 	if (irq1 & GET_MASK(F_VINOVPI)) {
878 		dev_err(dev, "Overvoltage input occurred\n");
879 		alert_userspace = true;
880 	}
881 
882 	if (irq1 & GET_MASK(F_BATAB)) {
883 		dev_err(dev, "Battery absence occurred\n");
884 		is_battery_absent = true;
885 		alert_userspace = true;
886 
887 		if ((mask1 & GET_MASK(F_BATABM)) == 0) {
888 			ret = regmap_field_write(info->regmap_fields[F_BATABM],
889 						 0x01);
890 			if (ret) {
891 				dev_err(dev, "Failed to mask BATAB interrupt\n");
892 				return ret;
893 			}
894 		}
895 
896 		ret = regmap_read(info->regmap, RT9455_REG_MASK2, &mask2);
897 		if (ret) {
898 			dev_err(dev, "Failed to read MASK2 register\n");
899 			return ret;
900 		}
901 
902 		if (mask2 & GET_MASK(F_CHTERMIM)) {
903 			ret = regmap_field_write(
904 				info->regmap_fields[F_CHTERMIM], 0x00);
905 			if (ret) {
906 				dev_err(dev, "Failed to unmask CHTERMI interrupt\n");
907 				return ret;
908 			}
909 		}
910 
911 		if (mask2 & GET_MASK(F_CHRCHGIM)) {
912 			ret = regmap_field_write(
913 				info->regmap_fields[F_CHRCHGIM], 0x00);
914 			if (ret) {
915 				dev_err(dev, "Failed to unmask CHRCHGI interrupt\n");
916 				return ret;
917 			}
918 		}
919 
920 		/*
921 		 * When the battery is absent, max_charging_time_work is
922 		 * cancelled, since no charging is done.
923 		 */
924 		cancel_delayed_work_sync(&info->max_charging_time_work);
925 		/*
926 		 * Since no interrupt is triggered when the battery is
927 		 * reconnected, max_charging_time_work is not rescheduled.
928 		 * Therefore, batt_presence_work is scheduled to check whether
929 		 * the battery is still absent or not.
930 		 */
931 		queue_delayed_work(system_power_efficient_wq,
932 				   &info->batt_presence_work,
933 				   RT9455_BATT_PRESENCE_DELAY * HZ);
934 	}
935 
936 	*_is_battery_absent = is_battery_absent;
937 
938 	if (alert_userspace)
939 		*_alert_userspace = alert_userspace;
940 
941 	return 0;
942 }
943 
944 static int rt9455_irq_handler_check_irq2_register(struct rt9455_info *info,
945 						  bool is_battery_absent,
946 						  bool *_alert_userspace)
947 {
948 	unsigned int irq2, mask2;
949 	struct device *dev = &info->client->dev;
950 	bool alert_userspace = false;
951 	int ret;
952 
953 	ret = regmap_read(info->regmap, RT9455_REG_IRQ2, &irq2);
954 	if (ret) {
955 		dev_err(dev, "Failed to read IRQ2 register\n");
956 		return ret;
957 	}
958 
959 	ret = regmap_read(info->regmap, RT9455_REG_MASK2, &mask2);
960 	if (ret) {
961 		dev_err(dev, "Failed to read MASK2 register\n");
962 		return ret;
963 	}
964 
965 	if (irq2 & GET_MASK(F_CHRVPI)) {
966 		dev_dbg(dev, "Charger fault occurred\n");
967 		/*
968 		 * CHRVPI bit is set in 2 cases:
969 		 * 1. when the power source is connected to the charger.
970 		 * 2. when the power source is disconnected from the charger.
971 		 * To identify the case, PWR_RDY bit is checked. Because
972 		 * PWR_RDY bit is set / cleared after CHRVPI interrupt is
973 		 * triggered, it is used delayed_work to later read PWR_RDY bit.
974 		 * Also, do not set to true alert_userspace, because there is no
975 		 * need to notify userspace when CHRVPI interrupt has occurred.
976 		 * Userspace will be notified after PWR_RDY bit is read.
977 		 */
978 		queue_delayed_work(system_power_efficient_wq,
979 				   &info->pwr_rdy_work,
980 				   RT9455_PWR_RDY_DELAY * HZ);
981 	}
982 	if (irq2 & GET_MASK(F_CHBATOVI)) {
983 		dev_err(dev, "Battery OVP occurred\n");
984 		alert_userspace = true;
985 	}
986 	if (irq2 & GET_MASK(F_CHTERMI)) {
987 		dev_dbg(dev, "Charge terminated\n");
988 		if (!is_battery_absent) {
989 			if ((mask2 & GET_MASK(F_CHTERMIM)) == 0) {
990 				ret = regmap_field_write(
991 					info->regmap_fields[F_CHTERMIM], 0x01);
992 				if (ret) {
993 					dev_err(dev, "Failed to mask CHTERMI interrupt\n");
994 					return ret;
995 				}
996 				/*
997 				 * Update MASK2 value, since CHTERMIM bit is
998 				 * set.
999 				 */
1000 				mask2 = mask2 | GET_MASK(F_CHTERMIM);
1001 			}
1002 			cancel_delayed_work_sync(&info->max_charging_time_work);
1003 			alert_userspace = true;
1004 		}
1005 	}
1006 	if (irq2 & GET_MASK(F_CHRCHGI)) {
1007 		dev_dbg(dev, "Recharge request\n");
1008 		ret = regmap_field_write(info->regmap_fields[F_CHG_EN],
1009 					 RT9455_CHARGE_ENABLE);
1010 		if (ret) {
1011 			dev_err(dev, "Failed to enable charging\n");
1012 			return ret;
1013 		}
1014 		if (mask2 & GET_MASK(F_CHTERMIM)) {
1015 			ret = regmap_field_write(
1016 				info->regmap_fields[F_CHTERMIM], 0x00);
1017 			if (ret) {
1018 				dev_err(dev, "Failed to unmask CHTERMI interrupt\n");
1019 				return ret;
1020 			}
1021 			/* Update MASK2 value, since CHTERMIM bit is cleared. */
1022 			mask2 = mask2 & ~GET_MASK(F_CHTERMIM);
1023 		}
1024 		if (!is_battery_absent) {
1025 			/*
1026 			 * No need to check whether the charger is connected to
1027 			 * power source when CHRCHGI is received, since CHRCHGI
1028 			 * is not triggered if the charger is not connected to
1029 			 * the power source.
1030 			 */
1031 			queue_delayed_work(system_power_efficient_wq,
1032 					   &info->max_charging_time_work,
1033 					   RT9455_MAX_CHARGING_TIME * HZ);
1034 			alert_userspace = true;
1035 		}
1036 	}
1037 	if (irq2 & GET_MASK(F_CH32MI)) {
1038 		dev_err(dev, "Charger fault. 32 mins timeout occurred\n");
1039 		alert_userspace = true;
1040 	}
1041 	if (irq2 & GET_MASK(F_CHTREGI)) {
1042 		dev_warn(dev,
1043 			 "Charger warning. Thermal regulation loop active\n");
1044 		alert_userspace = true;
1045 	}
1046 	if (irq2 & GET_MASK(F_CHMIVRI)) {
1047 		dev_dbg(dev,
1048 			"Charger warning. Input voltage MIVR loop active\n");
1049 	}
1050 
1051 	if (alert_userspace)
1052 		*_alert_userspace = alert_userspace;
1053 
1054 	return 0;
1055 }
1056 
1057 static int rt9455_irq_handler_check_irq3_register(struct rt9455_info *info,
1058 						  bool *_alert_userspace)
1059 {
1060 	unsigned int irq3, mask3;
1061 	struct device *dev = &info->client->dev;
1062 	bool alert_userspace = false;
1063 	int ret;
1064 
1065 	ret = regmap_read(info->regmap, RT9455_REG_IRQ3, &irq3);
1066 	if (ret) {
1067 		dev_err(dev, "Failed to read IRQ3 register\n");
1068 		return ret;
1069 	}
1070 
1071 	ret = regmap_read(info->regmap, RT9455_REG_MASK3, &mask3);
1072 	if (ret) {
1073 		dev_err(dev, "Failed to read MASK3 register\n");
1074 		return ret;
1075 	}
1076 
1077 	if (irq3 & GET_MASK(F_BSTBUSOVI)) {
1078 		dev_err(dev, "Boost fault. Overvoltage input occurred\n");
1079 		alert_userspace = true;
1080 	}
1081 	if (irq3 & GET_MASK(F_BSTOLI)) {
1082 		dev_err(dev, "Boost fault. Overload\n");
1083 		alert_userspace = true;
1084 	}
1085 	if (irq3 & GET_MASK(F_BSTLOWVI)) {
1086 		dev_err(dev, "Boost fault. Battery voltage too low\n");
1087 		alert_userspace = true;
1088 	}
1089 	if (irq3 & GET_MASK(F_BST32SI)) {
1090 		dev_err(dev, "Boost fault. 32 seconds timeout occurred.\n");
1091 		alert_userspace = true;
1092 	}
1093 
1094 	if (alert_userspace) {
1095 		dev_info(dev, "Boost fault occurred, therefore the charger goes into charge mode\n");
1096 		ret = rt9455_set_voreg_before_charge_mode(info);
1097 		if (ret) {
1098 			dev_err(dev, "Failed to set VOREG before entering charge mode\n");
1099 			return ret;
1100 		}
1101 		ret = regmap_field_write(info->regmap_fields[F_OPA_MODE],
1102 					 RT9455_CHARGE_MODE);
1103 		if (ret) {
1104 			dev_err(dev, "Failed to set charger in charge mode\n");
1105 			return ret;
1106 		}
1107 		*_alert_userspace = alert_userspace;
1108 	}
1109 
1110 	return 0;
1111 }
1112 
1113 static irqreturn_t rt9455_irq_handler_thread(int irq, void *data)
1114 {
1115 	struct rt9455_info *info = data;
1116 	struct device *dev;
1117 	bool alert_userspace = false;
1118 	bool is_battery_absent = false;
1119 	unsigned int status;
1120 	int ret;
1121 
1122 	if (!info)
1123 		return IRQ_NONE;
1124 
1125 	dev = &info->client->dev;
1126 
1127 	if (irq != info->client->irq) {
1128 		dev_err(dev, "Interrupt is not for RT9455 charger\n");
1129 		return IRQ_NONE;
1130 	}
1131 
1132 	ret = regmap_field_read(info->regmap_fields[F_STAT], &status);
1133 	if (ret) {
1134 		dev_err(dev, "Failed to read STAT bits\n");
1135 		return IRQ_HANDLED;
1136 	}
1137 	dev_dbg(dev, "Charger status is %d\n", status);
1138 
1139 	/*
1140 	 * Each function that processes an IRQ register receives as output
1141 	 * parameter alert_userspace pointer. alert_userspace is set to true
1142 	 * in such a function only if an interrupt has occurred in the
1143 	 * respective interrupt register. This way, it is avoided the following
1144 	 * case: interrupt occurs only in IRQ1 register,
1145 	 * rt9455_irq_handler_check_irq1_register() function sets to true
1146 	 * alert_userspace, but rt9455_irq_handler_check_irq2_register()
1147 	 * and rt9455_irq_handler_check_irq3_register() functions set to false
1148 	 * alert_userspace and power_supply_changed() is never called.
1149 	 */
1150 	ret = rt9455_irq_handler_check_irq1_register(info, &is_battery_absent,
1151 						     &alert_userspace);
1152 	if (ret) {
1153 		dev_err(dev, "Failed to handle IRQ1 register\n");
1154 		return IRQ_HANDLED;
1155 	}
1156 
1157 	ret = rt9455_irq_handler_check_irq2_register(info, is_battery_absent,
1158 						     &alert_userspace);
1159 	if (ret) {
1160 		dev_err(dev, "Failed to handle IRQ2 register\n");
1161 		return IRQ_HANDLED;
1162 	}
1163 
1164 	ret = rt9455_irq_handler_check_irq3_register(info, &alert_userspace);
1165 	if (ret) {
1166 		dev_err(dev, "Failed to handle IRQ3 register\n");
1167 		return IRQ_HANDLED;
1168 	}
1169 
1170 	if (alert_userspace) {
1171 		/*
1172 		 * Sometimes, an interrupt occurs while rt9455_probe() function
1173 		 * is executing and power_supply_register() is not yet called.
1174 		 * Do not call power_supply_changed() in this case.
1175 		 */
1176 		if (info->charger)
1177 			power_supply_changed(info->charger);
1178 	}
1179 
1180 	return IRQ_HANDLED;
1181 }
1182 
1183 static int rt9455_discover_charger(struct rt9455_info *info, u32 *ichrg,
1184 				   u32 *ieoc_percentage,
1185 				   u32 *mivr, u32 *iaicr)
1186 {
1187 	struct device *dev = &info->client->dev;
1188 	int ret;
1189 
1190 	if (!dev->of_node && !ACPI_HANDLE(dev)) {
1191 		dev_err(dev, "No support for either device tree or ACPI\n");
1192 		return -EINVAL;
1193 	}
1194 	/*
1195 	 * ICHRG, IEOC_PERCENTAGE, VOREG and boost output voltage are mandatory
1196 	 * parameters.
1197 	 */
1198 	ret = device_property_read_u32(dev, "richtek,output-charge-current",
1199 				       ichrg);
1200 	if (ret) {
1201 		dev_err(dev, "Error: missing \"output-charge-current\" property\n");
1202 		return ret;
1203 	}
1204 
1205 	ret = device_property_read_u32(dev, "richtek,end-of-charge-percentage",
1206 				       ieoc_percentage);
1207 	if (ret) {
1208 		dev_err(dev, "Error: missing \"end-of-charge-percentage\" property\n");
1209 		return ret;
1210 	}
1211 
1212 	ret = device_property_read_u32(dev,
1213 				       "richtek,battery-regulation-voltage",
1214 				       &info->voreg);
1215 	if (ret) {
1216 		dev_err(dev, "Error: missing \"battery-regulation-voltage\" property\n");
1217 		return ret;
1218 	}
1219 
1220 	ret = device_property_read_u32(dev, "richtek,boost-output-voltage",
1221 				       &info->boost_voltage);
1222 	if (ret) {
1223 		dev_err(dev, "Error: missing \"boost-output-voltage\" property\n");
1224 		return ret;
1225 	}
1226 
1227 	/*
1228 	 * MIVR and IAICR are optional parameters. Do not return error if one of
1229 	 * them is not present in ACPI table or device tree specification.
1230 	 */
1231 	device_property_read_u32(dev, "richtek,min-input-voltage-regulation",
1232 				 mivr);
1233 	device_property_read_u32(dev, "richtek,avg-input-current-regulation",
1234 				 iaicr);
1235 
1236 	return 0;
1237 }
1238 
1239 #if IS_ENABLED(CONFIG_USB_PHY)
1240 static int rt9455_usb_event_none(struct rt9455_info *info,
1241 				 u8 opa_mode, u8 iaicr)
1242 {
1243 	struct device *dev = &info->client->dev;
1244 	int ret;
1245 
1246 	if (opa_mode == RT9455_BOOST_MODE) {
1247 		ret = rt9455_set_voreg_before_charge_mode(info);
1248 		if (ret) {
1249 			dev_err(dev, "Failed to set VOREG before entering charge mode\n");
1250 			return ret;
1251 		}
1252 		/*
1253 		 * If the charger is in boost mode, and it has received
1254 		 * USB_EVENT_NONE, this means the consumer device powered by the
1255 		 * charger is not connected anymore.
1256 		 * In this case, the charger goes into charge mode.
1257 		 */
1258 		dev_dbg(dev, "USB_EVENT_NONE received, therefore the charger goes into charge mode\n");
1259 		ret = regmap_field_write(info->regmap_fields[F_OPA_MODE],
1260 					 RT9455_CHARGE_MODE);
1261 		if (ret) {
1262 			dev_err(dev, "Failed to set charger in charge mode\n");
1263 			return NOTIFY_DONE;
1264 		}
1265 	}
1266 
1267 	dev_dbg(dev, "USB_EVENT_NONE received, therefore IAICR is set to its minimum value\n");
1268 	if (iaicr != RT9455_IAICR_100MA) {
1269 		ret = regmap_field_write(info->regmap_fields[F_IAICR],
1270 					 RT9455_IAICR_100MA);
1271 		if (ret) {
1272 			dev_err(dev, "Failed to set IAICR value\n");
1273 			return NOTIFY_DONE;
1274 		}
1275 	}
1276 
1277 	return NOTIFY_OK;
1278 }
1279 
1280 static int rt9455_usb_event_vbus(struct rt9455_info *info,
1281 				 u8 opa_mode, u8 iaicr)
1282 {
1283 	struct device *dev = &info->client->dev;
1284 	int ret;
1285 
1286 	if (opa_mode == RT9455_BOOST_MODE) {
1287 		ret = rt9455_set_voreg_before_charge_mode(info);
1288 		if (ret) {
1289 			dev_err(dev, "Failed to set VOREG before entering charge mode\n");
1290 			return ret;
1291 		}
1292 		/*
1293 		 * If the charger is in boost mode, and it has received
1294 		 * USB_EVENT_VBUS, this means the consumer device powered by the
1295 		 * charger is not connected anymore.
1296 		 * In this case, the charger goes into charge mode.
1297 		 */
1298 		dev_dbg(dev, "USB_EVENT_VBUS received, therefore the charger goes into charge mode\n");
1299 		ret = regmap_field_write(info->regmap_fields[F_OPA_MODE],
1300 					 RT9455_CHARGE_MODE);
1301 		if (ret) {
1302 			dev_err(dev, "Failed to set charger in charge mode\n");
1303 			return NOTIFY_DONE;
1304 		}
1305 	}
1306 
1307 	dev_dbg(dev, "USB_EVENT_VBUS received, therefore IAICR is set to 500 mA\n");
1308 	if (iaicr != RT9455_IAICR_500MA) {
1309 		ret = regmap_field_write(info->regmap_fields[F_IAICR],
1310 					 RT9455_IAICR_500MA);
1311 		if (ret) {
1312 			dev_err(dev, "Failed to set IAICR value\n");
1313 			return NOTIFY_DONE;
1314 		}
1315 	}
1316 
1317 	return NOTIFY_OK;
1318 }
1319 
1320 static int rt9455_usb_event_id(struct rt9455_info *info,
1321 			       u8 opa_mode, u8 iaicr)
1322 {
1323 	struct device *dev = &info->client->dev;
1324 	int ret;
1325 
1326 	if (opa_mode == RT9455_CHARGE_MODE) {
1327 		ret = rt9455_set_boost_voltage_before_boost_mode(info);
1328 		if (ret) {
1329 			dev_err(dev, "Failed to set boost output voltage before entering boost mode\n");
1330 			return ret;
1331 		}
1332 		/*
1333 		 * If the charger is in charge mode, and it has received
1334 		 * USB_EVENT_ID, this means a consumer device is connected and
1335 		 * it should be powered by the charger.
1336 		 * In this case, the charger goes into boost mode.
1337 		 */
1338 		dev_dbg(dev, "USB_EVENT_ID received, therefore the charger goes into boost mode\n");
1339 		ret = regmap_field_write(info->regmap_fields[F_OPA_MODE],
1340 					 RT9455_BOOST_MODE);
1341 		if (ret) {
1342 			dev_err(dev, "Failed to set charger in boost mode\n");
1343 			return NOTIFY_DONE;
1344 		}
1345 	}
1346 
1347 	dev_dbg(dev, "USB_EVENT_ID received, therefore IAICR is set to its minimum value\n");
1348 	if (iaicr != RT9455_IAICR_100MA) {
1349 		ret = regmap_field_write(info->regmap_fields[F_IAICR],
1350 					 RT9455_IAICR_100MA);
1351 		if (ret) {
1352 			dev_err(dev, "Failed to set IAICR value\n");
1353 			return NOTIFY_DONE;
1354 		}
1355 	}
1356 
1357 	return NOTIFY_OK;
1358 }
1359 
1360 static int rt9455_usb_event_charger(struct rt9455_info *info,
1361 				    u8 opa_mode, u8 iaicr)
1362 {
1363 	struct device *dev = &info->client->dev;
1364 	int ret;
1365 
1366 	if (opa_mode == RT9455_BOOST_MODE) {
1367 		ret = rt9455_set_voreg_before_charge_mode(info);
1368 		if (ret) {
1369 			dev_err(dev, "Failed to set VOREG before entering charge mode\n");
1370 			return ret;
1371 		}
1372 		/*
1373 		 * If the charger is in boost mode, and it has received
1374 		 * USB_EVENT_CHARGER, this means the consumer device powered by
1375 		 * the charger is not connected anymore.
1376 		 * In this case, the charger goes into charge mode.
1377 		 */
1378 		dev_dbg(dev, "USB_EVENT_CHARGER received, therefore the charger goes into charge mode\n");
1379 		ret = regmap_field_write(info->regmap_fields[F_OPA_MODE],
1380 					 RT9455_CHARGE_MODE);
1381 		if (ret) {
1382 			dev_err(dev, "Failed to set charger in charge mode\n");
1383 			return NOTIFY_DONE;
1384 		}
1385 	}
1386 
1387 	dev_dbg(dev, "USB_EVENT_CHARGER received, therefore IAICR is set to no current limit\n");
1388 	if (iaicr != RT9455_IAICR_NO_LIMIT) {
1389 		ret = regmap_field_write(info->regmap_fields[F_IAICR],
1390 					 RT9455_IAICR_NO_LIMIT);
1391 		if (ret) {
1392 			dev_err(dev, "Failed to set IAICR value\n");
1393 			return NOTIFY_DONE;
1394 		}
1395 	}
1396 
1397 	return NOTIFY_OK;
1398 }
1399 
1400 static int rt9455_usb_event(struct notifier_block *nb,
1401 			    unsigned long event, void *power)
1402 {
1403 	struct rt9455_info *info = container_of(nb, struct rt9455_info, nb);
1404 	struct device *dev = &info->client->dev;
1405 	unsigned int opa_mode, iaicr;
1406 	int ret;
1407 
1408 	/*
1409 	 * Determine whether the charger is in charge mode
1410 	 * or in boost mode.
1411 	 */
1412 	ret = regmap_field_read(info->regmap_fields[F_OPA_MODE],
1413 				&opa_mode);
1414 	if (ret) {
1415 		dev_err(dev, "Failed to read OPA_MODE value\n");
1416 		return NOTIFY_DONE;
1417 	}
1418 
1419 	ret = regmap_field_read(info->regmap_fields[F_IAICR],
1420 				&iaicr);
1421 	if (ret) {
1422 		dev_err(dev, "Failed to read IAICR value\n");
1423 		return NOTIFY_DONE;
1424 	}
1425 
1426 	dev_dbg(dev, "Received USB event %lu\n", event);
1427 	switch (event) {
1428 	case USB_EVENT_NONE:
1429 		return rt9455_usb_event_none(info, opa_mode, iaicr);
1430 	case USB_EVENT_VBUS:
1431 		return rt9455_usb_event_vbus(info, opa_mode, iaicr);
1432 	case USB_EVENT_ID:
1433 		return rt9455_usb_event_id(info, opa_mode, iaicr);
1434 	case USB_EVENT_CHARGER:
1435 		return rt9455_usb_event_charger(info, opa_mode, iaicr);
1436 	default:
1437 		dev_err(dev, "Unknown USB event\n");
1438 	}
1439 	return NOTIFY_DONE;
1440 }
1441 #endif
1442 
1443 static void rt9455_pwr_rdy_work_callback(struct work_struct *work)
1444 {
1445 	struct rt9455_info *info = container_of(work, struct rt9455_info,
1446 						pwr_rdy_work.work);
1447 	struct device *dev = &info->client->dev;
1448 	unsigned int pwr_rdy;
1449 	int ret;
1450 
1451 	ret = regmap_field_read(info->regmap_fields[F_PWR_RDY], &pwr_rdy);
1452 	if (ret) {
1453 		dev_err(dev, "Failed to read PWR_RDY bit\n");
1454 		return;
1455 	}
1456 	switch (pwr_rdy) {
1457 	case RT9455_PWR_FAULT:
1458 		dev_dbg(dev, "Charger disconnected from power source\n");
1459 		cancel_delayed_work_sync(&info->max_charging_time_work);
1460 		break;
1461 	case RT9455_PWR_GOOD:
1462 		dev_dbg(dev, "Charger connected to power source\n");
1463 		ret = regmap_field_write(info->regmap_fields[F_CHG_EN],
1464 					 RT9455_CHARGE_ENABLE);
1465 		if (ret) {
1466 			dev_err(dev, "Failed to enable charging\n");
1467 			return;
1468 		}
1469 		queue_delayed_work(system_power_efficient_wq,
1470 				   &info->max_charging_time_work,
1471 				   RT9455_MAX_CHARGING_TIME * HZ);
1472 		break;
1473 	}
1474 	/*
1475 	 * Notify userspace that the charger has been either connected to or
1476 	 * disconnected from the power source.
1477 	 */
1478 	power_supply_changed(info->charger);
1479 }
1480 
1481 static void rt9455_max_charging_time_work_callback(struct work_struct *work)
1482 {
1483 	struct rt9455_info *info = container_of(work, struct rt9455_info,
1484 						max_charging_time_work.work);
1485 	struct device *dev = &info->client->dev;
1486 	int ret;
1487 
1488 	dev_err(dev, "Battery has been charging for at least 6 hours and is not yet fully charged. Battery is dead, therefore charging is disabled.\n");
1489 	ret = regmap_field_write(info->regmap_fields[F_CHG_EN],
1490 				 RT9455_CHARGE_DISABLE);
1491 	if (ret)
1492 		dev_err(dev, "Failed to disable charging\n");
1493 }
1494 
1495 static void rt9455_batt_presence_work_callback(struct work_struct *work)
1496 {
1497 	struct rt9455_info *info = container_of(work, struct rt9455_info,
1498 						batt_presence_work.work);
1499 	struct device *dev = &info->client->dev;
1500 	unsigned int irq1, mask1;
1501 	int ret;
1502 
1503 	ret = regmap_read(info->regmap, RT9455_REG_IRQ1, &irq1);
1504 	if (ret) {
1505 		dev_err(dev, "Failed to read IRQ1 register\n");
1506 		return;
1507 	}
1508 
1509 	/*
1510 	 * If the battery is still absent, batt_presence_work is rescheduled.
1511 	 * Otherwise, max_charging_time is scheduled.
1512 	 */
1513 	if (irq1 & GET_MASK(F_BATAB)) {
1514 		queue_delayed_work(system_power_efficient_wq,
1515 				   &info->batt_presence_work,
1516 				   RT9455_BATT_PRESENCE_DELAY * HZ);
1517 	} else {
1518 		queue_delayed_work(system_power_efficient_wq,
1519 				   &info->max_charging_time_work,
1520 				   RT9455_MAX_CHARGING_TIME * HZ);
1521 
1522 		ret = regmap_read(info->regmap, RT9455_REG_MASK1, &mask1);
1523 		if (ret) {
1524 			dev_err(dev, "Failed to read MASK1 register\n");
1525 			return;
1526 		}
1527 
1528 		if (mask1 & GET_MASK(F_BATABM)) {
1529 			ret = regmap_field_write(info->regmap_fields[F_BATABM],
1530 						 0x00);
1531 			if (ret)
1532 				dev_err(dev, "Failed to unmask BATAB interrupt\n");
1533 		}
1534 		/*
1535 		 * Notify userspace that the battery is now connected to the
1536 		 * charger.
1537 		 */
1538 		power_supply_changed(info->charger);
1539 	}
1540 }
1541 
1542 static const struct power_supply_desc rt9455_charger_desc = {
1543 	.name			= RT9455_DRIVER_NAME,
1544 	.type			= POWER_SUPPLY_TYPE_USB,
1545 	.properties		= rt9455_charger_properties,
1546 	.num_properties		= ARRAY_SIZE(rt9455_charger_properties),
1547 	.get_property		= rt9455_charger_get_property,
1548 };
1549 
1550 static bool rt9455_is_writeable_reg(struct device *dev, unsigned int reg)
1551 {
1552 	switch (reg) {
1553 	case RT9455_REG_DEV_ID:
1554 	case RT9455_REG_IRQ1:
1555 	case RT9455_REG_IRQ2:
1556 	case RT9455_REG_IRQ3:
1557 		return false;
1558 	default:
1559 		return true;
1560 	}
1561 }
1562 
1563 static bool rt9455_is_volatile_reg(struct device *dev, unsigned int reg)
1564 {
1565 	switch (reg) {
1566 	case RT9455_REG_DEV_ID:
1567 	case RT9455_REG_CTRL5:
1568 	case RT9455_REG_CTRL6:
1569 		return false;
1570 	default:
1571 		return true;
1572 	}
1573 }
1574 
1575 static const struct regmap_config rt9455_regmap_config = {
1576 	.reg_bits	= 8,
1577 	.val_bits	= 8,
1578 	.writeable_reg	= rt9455_is_writeable_reg,
1579 	.volatile_reg	= rt9455_is_volatile_reg,
1580 	.max_register	= RT9455_REG_MASK3,
1581 	.cache_type	= REGCACHE_RBTREE,
1582 };
1583 
1584 static int rt9455_probe(struct i2c_client *client,
1585 			const struct i2c_device_id *id)
1586 {
1587 	struct i2c_adapter *adapter = client->adapter;
1588 	struct device *dev = &client->dev;
1589 	struct rt9455_info *info;
1590 	struct power_supply_config rt9455_charger_config = {};
1591 	/*
1592 	 * Mandatory device-specific data values. Also, VOREG and boost output
1593 	 * voltage are mandatory values, but they are stored in rt9455_info
1594 	 * structure.
1595 	 */
1596 	u32 ichrg, ieoc_percentage;
1597 	/* Optional device-specific data values. */
1598 	u32 mivr = -1, iaicr = -1;
1599 	int i, ret;
1600 
1601 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
1602 		dev_err(dev, "No support for SMBUS_BYTE_DATA\n");
1603 		return -ENODEV;
1604 	}
1605 	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
1606 	if (!info)
1607 		return -ENOMEM;
1608 
1609 	info->client = client;
1610 	i2c_set_clientdata(client, info);
1611 
1612 	info->regmap = devm_regmap_init_i2c(client,
1613 					    &rt9455_regmap_config);
1614 	if (IS_ERR(info->regmap)) {
1615 		dev_err(dev, "Failed to initialize register map\n");
1616 		return -EINVAL;
1617 	}
1618 
1619 	for (i = 0; i < F_MAX_FIELDS; i++) {
1620 		info->regmap_fields[i] =
1621 			devm_regmap_field_alloc(dev, info->regmap,
1622 						rt9455_reg_fields[i]);
1623 		if (IS_ERR(info->regmap_fields[i])) {
1624 			dev_err(dev,
1625 				"Failed to allocate regmap field = %d\n", i);
1626 			return PTR_ERR(info->regmap_fields[i]);
1627 		}
1628 	}
1629 
1630 	ret = rt9455_discover_charger(info, &ichrg, &ieoc_percentage,
1631 				      &mivr, &iaicr);
1632 	if (ret) {
1633 		dev_err(dev, "Failed to discover charger\n");
1634 		return ret;
1635 	}
1636 
1637 #if IS_ENABLED(CONFIG_USB_PHY)
1638 	info->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
1639 	if (IS_ERR(info->usb_phy)) {
1640 		dev_err(dev, "Failed to get USB transceiver\n");
1641 	} else {
1642 		info->nb.notifier_call = rt9455_usb_event;
1643 		ret = usb_register_notifier(info->usb_phy, &info->nb);
1644 		if (ret) {
1645 			dev_err(dev, "Failed to register USB notifier\n");
1646 			/*
1647 			 * If usb_register_notifier() fails, set notifier_call
1648 			 * to NULL, to avoid calling usb_unregister_notifier().
1649 			 */
1650 			info->nb.notifier_call = NULL;
1651 		}
1652 	}
1653 #endif
1654 
1655 	INIT_DEFERRABLE_WORK(&info->pwr_rdy_work, rt9455_pwr_rdy_work_callback);
1656 	INIT_DEFERRABLE_WORK(&info->max_charging_time_work,
1657 			     rt9455_max_charging_time_work_callback);
1658 	INIT_DEFERRABLE_WORK(&info->batt_presence_work,
1659 			     rt9455_batt_presence_work_callback);
1660 
1661 	rt9455_charger_config.of_node		= dev->of_node;
1662 	rt9455_charger_config.drv_data		= info;
1663 	rt9455_charger_config.supplied_to	= rt9455_charger_supplied_to;
1664 	rt9455_charger_config.num_supplicants	=
1665 					ARRAY_SIZE(rt9455_charger_supplied_to);
1666 	ret = devm_request_threaded_irq(dev, client->irq, NULL,
1667 					rt9455_irq_handler_thread,
1668 					IRQF_TRIGGER_LOW | IRQF_ONESHOT,
1669 					RT9455_DRIVER_NAME, info);
1670 	if (ret) {
1671 		dev_err(dev, "Failed to register IRQ handler\n");
1672 		goto put_usb_notifier;
1673 	}
1674 
1675 	ret = rt9455_hw_init(info, ichrg, ieoc_percentage, mivr, iaicr);
1676 	if (ret) {
1677 		dev_err(dev, "Failed to set charger to its default values\n");
1678 		goto put_usb_notifier;
1679 	}
1680 
1681 	info->charger = devm_power_supply_register(dev, &rt9455_charger_desc,
1682 						   &rt9455_charger_config);
1683 	if (IS_ERR(info->charger)) {
1684 		dev_err(dev, "Failed to register charger\n");
1685 		ret = PTR_ERR(info->charger);
1686 		goto put_usb_notifier;
1687 	}
1688 
1689 	return 0;
1690 
1691 put_usb_notifier:
1692 #if IS_ENABLED(CONFIG_USB_PHY)
1693 	if (info->nb.notifier_call)  {
1694 		usb_unregister_notifier(info->usb_phy, &info->nb);
1695 		info->nb.notifier_call = NULL;
1696 	}
1697 #endif
1698 	return ret;
1699 }
1700 
1701 static int rt9455_remove(struct i2c_client *client)
1702 {
1703 	int ret;
1704 	struct rt9455_info *info = i2c_get_clientdata(client);
1705 
1706 	ret = rt9455_register_reset(info);
1707 	if (ret)
1708 		dev_err(&info->client->dev, "Failed to set charger to its default values\n");
1709 
1710 #if IS_ENABLED(CONFIG_USB_PHY)
1711 	if (info->nb.notifier_call)
1712 		usb_unregister_notifier(info->usb_phy, &info->nb);
1713 #endif
1714 
1715 	cancel_delayed_work_sync(&info->pwr_rdy_work);
1716 	cancel_delayed_work_sync(&info->max_charging_time_work);
1717 	cancel_delayed_work_sync(&info->batt_presence_work);
1718 
1719 	return ret;
1720 }
1721 
1722 static const struct i2c_device_id rt9455_i2c_id_table[] = {
1723 	{ RT9455_DRIVER_NAME, 0 },
1724 	{ },
1725 };
1726 MODULE_DEVICE_TABLE(i2c, rt9455_i2c_id_table);
1727 
1728 static const struct of_device_id rt9455_of_match[] = {
1729 	{ .compatible = "richtek,rt9455", },
1730 	{ },
1731 };
1732 MODULE_DEVICE_TABLE(of, rt9455_of_match);
1733 
1734 #ifdef CONFIG_ACPI
1735 static const struct acpi_device_id rt9455_i2c_acpi_match[] = {
1736 	{ "RT945500", 0 },
1737 	{ }
1738 };
1739 MODULE_DEVICE_TABLE(acpi, rt9455_i2c_acpi_match);
1740 #endif
1741 
1742 static struct i2c_driver rt9455_driver = {
1743 	.probe		= rt9455_probe,
1744 	.remove		= rt9455_remove,
1745 	.id_table	= rt9455_i2c_id_table,
1746 	.driver = {
1747 		.name		= RT9455_DRIVER_NAME,
1748 		.of_match_table	= of_match_ptr(rt9455_of_match),
1749 		.acpi_match_table = ACPI_PTR(rt9455_i2c_acpi_match),
1750 	},
1751 };
1752 module_i2c_driver(rt9455_driver);
1753 
1754 MODULE_LICENSE("GPL");
1755 MODULE_AUTHOR("Anda-Maria Nicolae <anda-maria.nicolae@intel.com>");
1756 MODULE_DESCRIPTION("Richtek RT9455 Charger Driver");
1757