xref: /openbmc/linux/drivers/power/supply/rt9471.c (revision fe20b1dc)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2022 Richtek Technology Corp.
4  *
5  * Authors: Alina Yu <alina_yu@richtek.com>
6  *          ChiYuan Huang <cy_huang@richtek.com>
7  */
8 
9 #include <linux/bits.h>
10 #include <linux/gpio/consumer.h>
11 #include <linux/i2c.h>
12 #include <linux/interrupt.h>
13 #include <linux/kstrtox.h>
14 #include <linux/linear_range.h>
15 #include <linux/mod_devicetable.h>
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/of.h>
19 #include <linux/power_supply.h>
20 #include <linux/regmap.h>
21 #include <linux/regulator/driver.h>
22 #include <linux/sysfs.h>
23 
24 #define RT9471_REG_OTGCFG	0x00
25 #define RT9471_REG_TOP		0x01
26 #define RT9471_REG_FUNC		0x02
27 #define RT9471_REG_IBUS		0x03
28 #define RT9471_REG_VBUS		0x04
29 #define RT9471_REG_PRECHG	0x05
30 #define RT9471_REG_VCHG		0x07
31 #define RT9471_REG_ICHG		0x08
32 #define RT9471_REG_CHGTMR	0x09
33 #define RT9471_REG_EOC		0x0A
34 #define RT9471_REG_INFO		0x0B
35 #define RT9471_REG_JEITA	0x0C
36 #define RT9471_REG_PUMP_EXP	0x0D
37 #define	RT9471_REG_DPDMDET	0x0E
38 #define RT9471_REG_ICSTAT	0x0F
39 #define	RT9471_REG_STAT0	0x10
40 #define RT9471_REG_STAT1	0x11
41 #define RT9471_REG_STAT2	0x12
42 #define RT9471_REG_IRQ0		0x20
43 #define RT9471_REG_MASK0	0x30
44 
45 #define RT9471_OTGCV_MASK	GENMASK(7, 6)
46 #define RT9471_OTGCC_MASK	BIT(0)
47 #define RT9471_OTGEN_MASK	BIT(1)
48 #define RT9471_CHGFAULT_MASK	GENMASK(4, 1)
49 
50 #define RT9471_NUM_IRQ_REGS	4
51 #define RT9471_OTGCV_MINUV	4850000
52 #define RT9471_OTGCV_STEPUV	150000
53 #define RT9471_NUM_VOTG		4
54 #define RT9471_VCHG_MAXUV	4700000
55 #define RT9471_ICHG_MAXUA	3150000
56 
57 /* Device ID */
58 #define RT9470_DEVID		0x09
59 #define RT9470D_DEVID		0x0A
60 #define RT9471_DEVID		0x0D
61 #define RT9471D_DEVID		0x0E
62 
63 /* IRQ number */
64 #define RT9471_IRQ_BC12_DONE	0
65 #define RT9471_IRQ_DETACH	1
66 #define RT9471_IRQ_RECHG	2
67 #define RT9471_IRQ_CHG_DONE	3
68 #define RT9471_IRQ_BG_CHG	4
69 #define RT9471_IRQ_IE0C		5
70 #define RT9471_IRQ_CHG_RDY	6
71 #define RT9471_IRQ_VBUS_GD	7
72 #define RT9471_IRQ_CHG_BATOV	9
73 #define RT9471_IRQ_CHG_SYSOV	10
74 #define RT9471_IRQ_CHG_TOUT	11
75 #define RT9471_IRQ_CHG_BUSUV	12
76 #define RT9471_IRQ_CHG_THREG	13
77 #define RT9471_IRQ_CHG_AICR	14
78 #define RT9471_IRQ_CHG_MIVR	15
79 #define RT9471_IRQ_SYS_SHORT	16
80 #define RT9471_IRQ_SYS_MIN	17
81 #define RT9471_IRQ_AICC_DONE	18
82 #define RT9471_IRQ_PE_DONE	19
83 #define RT9471_IRQ_JEITA_COLD	20
84 #define RT9471_IRQ_JEITA_COOL	21
85 #define RT9471_IRQ_JEITA_WARM	22
86 #define RT9471_IRQ_JEITA_HOT	23
87 #define RT9471_IRQ_OTG_FAULT	24
88 #define RT9471_IRQ_OTG_LBP	25
89 #define RT9471_IRQ_OTG_CC	26
90 #define RT9471_IRQ_WDT		29
91 #define RT9471_IRQ_VAC_OV	30
92 #define RT9471_IRQ_OTP		31
93 
94 enum rt9471_fields {
95 	F_WDT = 0,
96 	F_WDT_RST,
97 	F_CHG_EN,
98 	F_HZ,
99 	F_BATFET_DIS,
100 	F_AICR,
101 	F_AICC_EN,
102 	F_MIVR,
103 	F_IPRE_CHG,
104 	F_VPRE_CHG,
105 	F_VBAT_REG,
106 	F_ICHG_REG,
107 	F_EOC_RST,
108 	F_TE,
109 	F_IEOC_CHG,
110 	F_DEVICE_ID,
111 	F_REG_RST,
112 	F_BC12_EN,
113 	F_IC_STAT,
114 	F_PORT_STAT,
115 	F_ST_CHG_DONE,
116 	F_ST_CHG_RDY,
117 	F_ST_VBUS_GD,
118 	F_MAX_FIELDS
119 };
120 
121 enum rt9471_ranges {
122 	RT9471_RANGE_AICR = 0,
123 	RT9471_RANGE_MIVR,
124 	RT9471_RANGE_IPRE,
125 	RT9471_RANGE_VCHG,
126 	RT9471_RANGE_ICHG,
127 	RT9471_RANGE_IEOC,
128 	RT9471_MAX_RANGES
129 };
130 
131 enum {
132 	RT9471_PORTSTAT_APPLE_10W = 8,
133 	RT9471_PORTSTAT_SAMSUNG_10W,
134 	RT9471_PORTSTAT_APPLE_5W,
135 	RT9471_PORTSTAT_APPLE_12W,
136 	RT9471_PORTSTAT_NSTD,
137 	RT9471_PORTSTAT_SDP,
138 	RT9471_PORTSTAT_CDP,
139 	RT9471_PORTSTAT_DCP,
140 };
141 
142 struct rt9471_chip {
143 	struct device *dev;
144 	struct regmap *regmap;
145 	struct regmap_field *rm_fields[F_MAX_FIELDS];
146 	struct regmap_irq_chip_data *irq_chip_data;
147 	struct regulator_dev *otg_rdev;
148 	struct power_supply *psy;
149 	struct power_supply_desc psy_desc;
150 	struct mutex var_lock;
151 	enum power_supply_usb_type psy_usb_type;
152 	int psy_usb_curr;
153 };
154 
155 static const struct reg_field rt9471_reg_fields[F_MAX_FIELDS] = {
156 	[F_WDT]		= REG_FIELD(RT9471_REG_TOP, 0, 0),
157 	[F_WDT_RST]	= REG_FIELD(RT9471_REG_TOP, 1, 1),
158 	[F_CHG_EN]	= REG_FIELD(RT9471_REG_FUNC, 0, 0),
159 	[F_HZ]		= REG_FIELD(RT9471_REG_FUNC, 5, 5),
160 	[F_BATFET_DIS]	= REG_FIELD(RT9471_REG_FUNC, 7, 7),
161 	[F_AICR]	= REG_FIELD(RT9471_REG_IBUS, 0, 5),
162 	[F_AICC_EN]	= REG_FIELD(RT9471_REG_IBUS, 7, 7),
163 	[F_MIVR]	= REG_FIELD(RT9471_REG_VBUS, 0, 3),
164 	[F_IPRE_CHG]	= REG_FIELD(RT9471_REG_PRECHG, 0, 3),
165 	[F_VPRE_CHG]	= REG_FIELD(RT9471_REG_PRECHG, 4, 6),
166 	[F_VBAT_REG]	= REG_FIELD(RT9471_REG_VCHG, 0, 6),
167 	[F_ICHG_REG]	= REG_FIELD(RT9471_REG_ICHG, 0, 5),
168 	[F_EOC_RST]	= REG_FIELD(RT9471_REG_EOC, 0, 0),
169 	[F_TE]		= REG_FIELD(RT9471_REG_EOC, 1, 1),
170 	[F_IEOC_CHG]	= REG_FIELD(RT9471_REG_EOC, 4, 7),
171 	[F_DEVICE_ID]	= REG_FIELD(RT9471_REG_INFO, 3, 6),
172 	[F_REG_RST]	= REG_FIELD(RT9471_REG_INFO, 7, 7),
173 	[F_BC12_EN]	= REG_FIELD(RT9471_REG_DPDMDET, 7, 7),
174 	[F_IC_STAT]	= REG_FIELD(RT9471_REG_ICSTAT, 0, 3),
175 	[F_PORT_STAT]	= REG_FIELD(RT9471_REG_ICSTAT, 4, 7),
176 	[F_ST_CHG_DONE]	= REG_FIELD(RT9471_REG_STAT0, 3, 3),
177 	[F_ST_CHG_RDY]	= REG_FIELD(RT9471_REG_STAT0, 6, 6),
178 	[F_ST_VBUS_GD]	= REG_FIELD(RT9471_REG_STAT0, 7, 7),
179 };
180 
181 static const struct linear_range rt9471_chg_ranges[RT9471_MAX_RANGES] = {
182 	[RT9471_RANGE_AICR] = { .min = 50000,	.min_sel = 1, .max_sel = 63, .step = 50000 },
183 	[RT9471_RANGE_MIVR] = { .min = 3900000,	.min_sel = 0, .max_sel = 15, .step = 100000 },
184 	[RT9471_RANGE_IPRE] = { .min = 50000,	.min_sel = 0, .max_sel = 15, .step = 50000 },
185 	[RT9471_RANGE_VCHG] = { .min = 3900000,	.min_sel = 0, .max_sel = 80, .step = 10000 },
186 	[RT9471_RANGE_ICHG] = { .min = 0,	.min_sel = 0, .max_sel = 63, .step = 50000 },
187 	[RT9471_RANGE_IEOC] = { .min = 50000,	.min_sel = 0, .max_sel = 15, .step = 50000 },
188 };
189 
rt9471_set_value_by_field_range(struct rt9471_chip * chip,enum rt9471_fields field,enum rt9471_ranges range,int val)190 static int rt9471_set_value_by_field_range(struct rt9471_chip *chip,
191 					   enum rt9471_fields field,
192 					   enum rt9471_ranges range, int val)
193 {
194 	unsigned int sel;
195 
196 	if (val < 0)
197 		return -EINVAL;
198 
199 	linear_range_get_selector_within(rt9471_chg_ranges + range, val, &sel);
200 
201 	return regmap_field_write(chip->rm_fields[field], sel);
202 }
203 
204 
rt9471_get_value_by_field_range(struct rt9471_chip * chip,enum rt9471_fields field,enum rt9471_ranges range,int * val)205 static int rt9471_get_value_by_field_range(struct rt9471_chip *chip,
206 					   enum rt9471_fields field,
207 					   enum rt9471_ranges range, int *val)
208 {
209 	unsigned int sel, rvalue;
210 	int ret;
211 
212 	ret = regmap_field_read(chip->rm_fields[field], &sel);
213 	if (ret)
214 		return ret;
215 
216 	ret = linear_range_get_value(rt9471_chg_ranges + range, sel, &rvalue);
217 	if (ret)
218 		return ret;
219 
220 	*val = rvalue;
221 	return 0;
222 }
223 
rt9471_set_ieoc(struct rt9471_chip * chip,int microamp)224 static int rt9471_set_ieoc(struct rt9471_chip *chip, int microamp)
225 {
226 	int ret;
227 
228 	if (microamp == 0)
229 		return regmap_field_write(chip->rm_fields[F_TE], 0);
230 
231 	ret = rt9471_set_value_by_field_range(chip, F_IEOC_CHG, RT9471_RANGE_IEOC, microamp);
232 	if (ret)
233 		return ret;
234 
235 	/* After applying the new IEOC value, enable charge termination */
236 	return regmap_field_write(chip->rm_fields[F_TE], 1);
237 }
238 
rt9471_get_ieoc(struct rt9471_chip * chip,int * microamp)239 static int rt9471_get_ieoc(struct rt9471_chip *chip, int *microamp)
240 {
241 	unsigned int chg_term_enable;
242 	int ret;
243 
244 	ret = regmap_field_read(chip->rm_fields[F_TE], &chg_term_enable);
245 	if (ret)
246 		return ret;
247 
248 	if (!chg_term_enable) {
249 		*microamp = 0;
250 		return 0;
251 	}
252 
253 	return rt9471_get_value_by_field_range(chip, F_IEOC_CHG, RT9471_RANGE_IEOC, microamp);
254 }
255 
rt9471_get_status(struct rt9471_chip * chip,int * status)256 static int rt9471_get_status(struct rt9471_chip *chip, int *status)
257 {
258 	unsigned int chg_ready, chg_done, fault_stat;
259 	int ret;
260 
261 	ret = regmap_field_read(chip->rm_fields[F_ST_CHG_RDY], &chg_ready);
262 	if (ret)
263 		return ret;
264 
265 	ret = regmap_field_read(chip->rm_fields[F_ST_CHG_DONE], &chg_done);
266 	if (ret)
267 		return ret;
268 
269 	ret = regmap_read(chip->regmap, RT9471_REG_STAT1, &fault_stat);
270 	if (ret)
271 		return ret;
272 
273 	fault_stat &= RT9471_CHGFAULT_MASK;
274 
275 	if (chg_ready && chg_done)
276 		*status = POWER_SUPPLY_STATUS_FULL;
277 	else if (chg_ready && fault_stat)
278 		*status = POWER_SUPPLY_STATUS_NOT_CHARGING;
279 	else if (chg_ready && !fault_stat)
280 		*status = POWER_SUPPLY_STATUS_CHARGING;
281 	else
282 		*status = POWER_SUPPLY_STATUS_DISCHARGING;
283 
284 	return 0;
285 }
286 
rt9471_get_vbus_good(struct rt9471_chip * chip,int * stat)287 static int rt9471_get_vbus_good(struct rt9471_chip *chip, int *stat)
288 {
289 	unsigned int vbus_gd;
290 	int ret;
291 
292 	ret = regmap_field_read(chip->rm_fields[F_ST_VBUS_GD], &vbus_gd);
293 	if (ret)
294 		return ret;
295 
296 	*stat = vbus_gd;
297 	return 0;
298 }
299 
rt9471_get_usb_type(struct rt9471_chip * chip,int * usb_type)300 static int rt9471_get_usb_type(struct rt9471_chip *chip, int *usb_type)
301 {
302 	mutex_lock(&chip->var_lock);
303 	*usb_type = chip->psy_usb_type;
304 	mutex_unlock(&chip->var_lock);
305 
306 	return 0;
307 }
308 
rt9471_get_usb_type_current(struct rt9471_chip * chip,int * microamp)309 static int rt9471_get_usb_type_current(struct rt9471_chip *chip,
310 					      int *microamp)
311 {
312 	mutex_lock(&chip->var_lock);
313 	*microamp = chip->psy_usb_curr;
314 	mutex_unlock(&chip->var_lock);
315 
316 	return 0;
317 }
318 
319 static enum power_supply_property rt9471_charger_properties[] = {
320 	POWER_SUPPLY_PROP_STATUS,
321 	POWER_SUPPLY_PROP_ONLINE,
322 	POWER_SUPPLY_PROP_CURRENT_MAX,
323 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
324 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
325 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
326 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
327 	POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
328 	POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT,
329 	POWER_SUPPLY_PROP_USB_TYPE,
330 	POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
331 	POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
332 	POWER_SUPPLY_PROP_MODEL_NAME,
333 	POWER_SUPPLY_PROP_MANUFACTURER,
334 };
335 
336 static enum power_supply_usb_type rt9471_charger_usb_types[] = {
337 	POWER_SUPPLY_USB_TYPE_UNKNOWN,
338 	POWER_SUPPLY_USB_TYPE_SDP,
339 	POWER_SUPPLY_USB_TYPE_DCP,
340 	POWER_SUPPLY_USB_TYPE_CDP,
341 	POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID,
342 };
343 
rt9471_charger_property_is_writeable(struct power_supply * psy,enum power_supply_property psp)344 static int rt9471_charger_property_is_writeable(struct power_supply *psy,
345 						enum power_supply_property psp)
346 {
347 	switch (psp) {
348 	case POWER_SUPPLY_PROP_STATUS:
349 	case POWER_SUPPLY_PROP_ONLINE:
350 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
351 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
352 	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
353 	case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
354 	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
355 	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
356 		return 1;
357 	default:
358 		return 0;
359 	}
360 }
361 
rt9471_charger_set_property(struct power_supply * psy,enum power_supply_property psp,const union power_supply_propval * val)362 static int rt9471_charger_set_property(struct power_supply *psy,
363 				       enum power_supply_property psp,
364 				       const union power_supply_propval *val)
365 {
366 	struct rt9471_chip *chip = power_supply_get_drvdata(psy);
367 	int value = val->intval;
368 
369 	switch (psp) {
370 	case POWER_SUPPLY_PROP_STATUS:
371 		return regmap_field_write(chip->rm_fields[F_CHG_EN], !!value);
372 	case POWER_SUPPLY_PROP_ONLINE:
373 		return regmap_field_write(chip->rm_fields[F_HZ], !value);
374 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
375 		return rt9471_set_value_by_field_range(chip, F_ICHG_REG, RT9471_RANGE_ICHG, value);
376 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
377 		return rt9471_set_value_by_field_range(chip, F_VBAT_REG, RT9471_RANGE_VCHG, value);
378 	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
379 		return rt9471_set_value_by_field_range(chip, F_AICR, RT9471_RANGE_AICR, value);
380 	case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
381 		return rt9471_set_value_by_field_range(chip, F_MIVR, RT9471_RANGE_MIVR, value);
382 	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
383 		return rt9471_set_value_by_field_range(chip, F_IPRE_CHG, RT9471_RANGE_IPRE, value);
384 	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
385 		return rt9471_set_ieoc(chip, val->intval);
386 	default:
387 		return -EINVAL;
388 	}
389 }
390 
391 static const char * const rt9471_manufacturer	= "Richtek Technology Corp.";
392 static const char * const rt9471_model		= "RT9471";
393 
rt9471_charger_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)394 static int rt9471_charger_get_property(struct power_supply *psy,
395 				       enum power_supply_property psp,
396 				       union power_supply_propval *val)
397 {
398 	struct rt9471_chip *chip = power_supply_get_drvdata(psy);
399 	int *pvalue = &val->intval;
400 
401 	switch (psp) {
402 	case POWER_SUPPLY_PROP_STATUS:
403 		return rt9471_get_status(chip, pvalue);
404 	case POWER_SUPPLY_PROP_ONLINE:
405 		return rt9471_get_vbus_good(chip, pvalue);
406 	case POWER_SUPPLY_PROP_CURRENT_MAX:
407 		return rt9471_get_usb_type_current(chip, pvalue);
408 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
409 		return rt9471_get_value_by_field_range(chip, F_ICHG_REG, RT9471_RANGE_ICHG, pvalue);
410 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
411 		*pvalue = RT9471_ICHG_MAXUA;
412 		return 0;
413 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
414 		return rt9471_get_value_by_field_range(chip, F_VBAT_REG, RT9471_RANGE_VCHG, pvalue);
415 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
416 		val->intval = RT9471_VCHG_MAXUV;
417 		return 0;
418 	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
419 		return rt9471_get_value_by_field_range(chip, F_AICR, RT9471_RANGE_AICR, pvalue);
420 	case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
421 		return rt9471_get_value_by_field_range(chip, F_MIVR, RT9471_RANGE_MIVR, pvalue);
422 	case POWER_SUPPLY_PROP_USB_TYPE:
423 		return rt9471_get_usb_type(chip, pvalue);
424 	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
425 		return rt9471_get_value_by_field_range(chip, F_IPRE_CHG, RT9471_RANGE_IPRE, pvalue);
426 	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
427 		return rt9471_get_ieoc(chip, pvalue);
428 	case POWER_SUPPLY_PROP_MODEL_NAME:
429 		val->strval = rt9471_model;
430 		return 0;
431 	case POWER_SUPPLY_PROP_MANUFACTURER:
432 		val->strval = rt9471_manufacturer;
433 		return 0;
434 	default:
435 		return -ENODATA;
436 	}
437 }
438 
rt9471_vbus_gd_handler(int irqno,void * devid)439 static irqreturn_t rt9471_vbus_gd_handler(int irqno, void *devid)
440 {
441 	struct rt9471_chip *chip = devid;
442 
443 	power_supply_changed(chip->psy);
444 
445 	return IRQ_HANDLED;
446 }
447 
rt9471_detach_handler(int irqno,void * devid)448 static irqreturn_t rt9471_detach_handler(int irqno, void *devid)
449 {
450 	struct rt9471_chip *chip = devid;
451 	unsigned int vbus_gd;
452 	int ret;
453 
454 	ret = regmap_field_read(chip->rm_fields[F_ST_VBUS_GD], &vbus_gd);
455 	if (ret)
456 		return IRQ_NONE;
457 
458 	/* Only focus on really detached */
459 	if (vbus_gd)
460 		return IRQ_HANDLED;
461 
462 	mutex_lock(&chip->var_lock);
463 	chip->psy_usb_type = POWER_SUPPLY_USB_TYPE_UNKNOWN;
464 	chip->psy_usb_curr = 0;
465 	mutex_unlock(&chip->var_lock);
466 
467 	power_supply_changed(chip->psy);
468 
469 	return IRQ_HANDLED;
470 }
471 
rt9471_bc12_done_handler(int irqno,void * devid)472 static irqreturn_t rt9471_bc12_done_handler(int irqno, void *devid)
473 {
474 	struct rt9471_chip *chip = devid;
475 	enum power_supply_usb_type usb_type;
476 	unsigned int port_stat;
477 	int usb_curr, ret;
478 
479 	ret = regmap_field_read(chip->rm_fields[F_PORT_STAT], &port_stat);
480 	if (ret)
481 		return IRQ_NONE;
482 
483 	switch (port_stat) {
484 	case RT9471_PORTSTAT_APPLE_10W:
485 		usb_type = POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID;
486 		usb_curr = 2000000;
487 		break;
488 	case RT9471_PORTSTAT_APPLE_5W:
489 		usb_type = POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID;
490 		usb_curr = 1000000;
491 		break;
492 	case RT9471_PORTSTAT_APPLE_12W:
493 		usb_type = POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID;
494 		usb_curr = 2400000;
495 		break;
496 	case RT9471_PORTSTAT_SAMSUNG_10W:
497 		usb_type = POWER_SUPPLY_USB_TYPE_DCP;
498 		usb_curr = 2000000;
499 		break;
500 	case RT9471_PORTSTAT_DCP:
501 		usb_type = POWER_SUPPLY_USB_TYPE_DCP;
502 		usb_curr = 1500000;
503 		break;
504 	case RT9471_PORTSTAT_NSTD:
505 	case RT9471_PORTSTAT_SDP:
506 		usb_type = POWER_SUPPLY_USB_TYPE_SDP;
507 		usb_curr = 500000;
508 		break;
509 	case RT9471_PORTSTAT_CDP:
510 		usb_type = POWER_SUPPLY_USB_TYPE_CDP;
511 		usb_curr = 1500000;
512 		break;
513 	default:
514 		usb_type = POWER_SUPPLY_USB_TYPE_UNKNOWN;
515 		usb_curr = 0;
516 		break;
517 	}
518 
519 	mutex_lock(&chip->var_lock);
520 	chip->psy_usb_type = usb_type;
521 	chip->psy_usb_curr = usb_curr;
522 	mutex_unlock(&chip->var_lock);
523 
524 	power_supply_changed(chip->psy);
525 
526 	return IRQ_HANDLED;
527 }
528 
rt9471_wdt_handler(int irqno,void * devid)529 static irqreturn_t rt9471_wdt_handler(int irqno, void *devid)
530 {
531 	struct rt9471_chip *chip = devid;
532 	int ret;
533 
534 	ret = regmap_field_write(chip->rm_fields[F_WDT_RST], 1);
535 
536 	return ret ? IRQ_NONE : IRQ_HANDLED;
537 }
538 
rt9471_otg_fault_handler(int irqno,void * devid)539 static irqreturn_t rt9471_otg_fault_handler(int irqno, void *devid)
540 {
541 	struct rt9471_chip *chip = devid;
542 
543 	regulator_notifier_call_chain(chip->otg_rdev, REGULATOR_EVENT_FAIL, NULL);
544 
545 	return IRQ_HANDLED;
546 }
547 
548 #define RT9471_IRQ_DESC(_name, _hwirq) \
549 { \
550 	.name = #_name, \
551 	.hwirq = _hwirq, \
552 	.handler = rt9471_##_name##_handler, \
553 }
554 
rt9471_register_interrupts(struct rt9471_chip * chip)555 static int rt9471_register_interrupts(struct rt9471_chip *chip)
556 {
557 	struct device *dev = chip->dev;
558 	static const struct {
559 		char *name;
560 		int hwirq;
561 		irq_handler_t handler;
562 	} chg_irqs[] = {
563 		RT9471_IRQ_DESC(vbus_gd, RT9471_IRQ_VBUS_GD),
564 		RT9471_IRQ_DESC(detach, RT9471_IRQ_DETACH),
565 		RT9471_IRQ_DESC(bc12_done, RT9471_IRQ_BC12_DONE),
566 		RT9471_IRQ_DESC(wdt, RT9471_IRQ_WDT),
567 		RT9471_IRQ_DESC(otg_fault, RT9471_IRQ_OTG_FAULT),
568 	}, *curr;
569 	int i, virq, ret;
570 
571 	for (i = 0; i < ARRAY_SIZE(chg_irqs); i++) {
572 		curr = chg_irqs + i;
573 
574 		virq = regmap_irq_get_virq(chip->irq_chip_data, curr->hwirq);
575 		if (virq <= 0)
576 			return virq;
577 
578 		ret = devm_request_threaded_irq(dev, virq, NULL, curr->handler,
579 						IRQF_ONESHOT, curr->name, chip);
580 		if (ret)
581 			return dev_err_probe(dev, ret, "Failed to register IRQ (%s)\n",
582 					     curr->name);
583 	}
584 
585 	return 0;
586 }
587 
588 static const struct regulator_ops rt9471_otg_ops = {
589 	.enable = regulator_enable_regmap,
590 	.disable = regulator_disable_regmap,
591 	.is_enabled = regulator_is_enabled_regmap,
592 	.list_voltage = regulator_list_voltage_linear,
593 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
594 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
595 	.set_current_limit = regulator_set_current_limit_regmap,
596 	.get_current_limit = regulator_get_current_limit_regmap,
597 };
598 
599 static const unsigned int rt9471_otg_microamp[] = { 500000, 1200000, };
600 
601 static const struct regulator_desc rt9471_otg_rdesc = {
602 	.of_match = of_match_ptr("usb-otg-vbus-regulator"),
603 	.name = "rt9471-otg-vbus",
604 	.owner = THIS_MODULE,
605 	.type = REGULATOR_VOLTAGE,
606 	.ops = &rt9471_otg_ops,
607 	.min_uV = RT9471_OTGCV_MINUV,
608 	.uV_step = RT9471_OTGCV_STEPUV,
609 	.n_voltages = RT9471_NUM_VOTG,
610 	.curr_table = rt9471_otg_microamp,
611 	.n_current_limits = ARRAY_SIZE(rt9471_otg_microamp),
612 	.enable_mask = RT9471_OTGEN_MASK,
613 	.enable_reg = RT9471_REG_FUNC,
614 	.vsel_reg = RT9471_REG_OTGCFG,
615 	.vsel_mask = RT9471_OTGCV_MASK,
616 	.csel_reg = RT9471_REG_OTGCFG,
617 	.csel_mask = RT9471_OTGCC_MASK,
618 };
619 
rt9471_register_otg_regulator(struct rt9471_chip * chip)620 static int rt9471_register_otg_regulator(struct rt9471_chip *chip)
621 {
622 	struct device *dev = chip->dev;
623 	struct regulator_config cfg = { .dev = dev, .driver_data = chip };
624 
625 	chip->otg_rdev = devm_regulator_register(dev, &rt9471_otg_rdesc, &cfg);
626 
627 	return PTR_ERR_OR_ZERO(chip->otg_rdev);
628 }
629 
psy_device_to_chip(struct device * dev)630 static inline struct rt9471_chip *psy_device_to_chip(struct device *dev)
631 {
632 	return power_supply_get_drvdata(to_power_supply(dev));
633 }
634 
sysoff_enable_show(struct device * dev,struct device_attribute * attr,char * buf)635 static ssize_t sysoff_enable_show(struct device *dev,
636 				  struct device_attribute *attr, char *buf)
637 {
638 	struct rt9471_chip *chip = psy_device_to_chip(dev);
639 	unsigned int sysoff_enable;
640 	int ret;
641 
642 	ret = regmap_field_read(chip->rm_fields[F_BATFET_DIS], &sysoff_enable);
643 	if (ret)
644 		return ret;
645 
646 	return sysfs_emit(buf, "%d\n", sysoff_enable);
647 }
648 
sysoff_enable_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)649 static ssize_t sysoff_enable_store(struct device *dev,
650 				   struct device_attribute *attr,
651 				   const char *buf, size_t count)
652 {
653 	struct rt9471_chip *chip = psy_device_to_chip(dev);
654 	unsigned int tmp;
655 	int ret;
656 
657 	ret = kstrtouint(buf, 10, &tmp);
658 	if (ret)
659 		return ret;
660 
661 	ret = regmap_field_write(chip->rm_fields[F_BATFET_DIS], !!tmp);
662 	if (ret)
663 		return ret;
664 
665 	return count;
666 }
667 
port_detect_enable_show(struct device * dev,struct device_attribute * attr,char * buf)668 static ssize_t port_detect_enable_show(struct device *dev,
669 				       struct device_attribute *attr, char *buf)
670 {
671 	struct rt9471_chip *chip = psy_device_to_chip(dev);
672 	unsigned int bc12_enable;
673 	int ret;
674 
675 	ret = regmap_field_read(chip->rm_fields[F_BC12_EN], &bc12_enable);
676 	if (ret)
677 		return ret;
678 
679 	return sysfs_emit(buf, "%d\n", bc12_enable);
680 }
681 
port_detect_enable_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)682 static ssize_t port_detect_enable_store(struct device *dev,
683 					struct device_attribute *attr,
684 					const char *buf, size_t count)
685 {
686 	struct rt9471_chip *chip = psy_device_to_chip(dev);
687 	unsigned int tmp;
688 	int ret;
689 
690 	ret = kstrtouint(buf, 10, &tmp);
691 	if (ret)
692 		return ret;
693 
694 	ret = regmap_field_write(chip->rm_fields[F_BC12_EN], !!tmp);
695 	if (ret)
696 		return ret;
697 
698 	return count;
699 }
700 
701 static DEVICE_ATTR_RW(sysoff_enable);
702 static DEVICE_ATTR_RW(port_detect_enable);
703 
704 static struct attribute *rt9471_sysfs_attrs[] = {
705 	&dev_attr_sysoff_enable.attr,
706 	&dev_attr_port_detect_enable.attr,
707 	NULL
708 };
709 
710 ATTRIBUTE_GROUPS(rt9471_sysfs);
711 
rt9471_register_psy(struct rt9471_chip * chip)712 static int rt9471_register_psy(struct rt9471_chip *chip)
713 {
714 	struct device *dev = chip->dev;
715 	struct power_supply_desc *desc = &chip->psy_desc;
716 	struct power_supply_config cfg = {};
717 	char *psy_name;
718 
719 	cfg.drv_data = chip;
720 	cfg.of_node = dev->of_node;
721 	cfg.attr_grp = rt9471_sysfs_groups;
722 
723 	psy_name = devm_kasprintf(dev, GFP_KERNEL, "rt9471-%s", dev_name(dev));
724 	if (!psy_name)
725 		return -ENOMEM;
726 
727 	desc->name = psy_name;
728 	desc->type = POWER_SUPPLY_TYPE_USB;
729 	desc->usb_types = rt9471_charger_usb_types;
730 	desc->num_usb_types = ARRAY_SIZE(rt9471_charger_usb_types);
731 	desc->properties = rt9471_charger_properties;
732 	desc->num_properties = ARRAY_SIZE(rt9471_charger_properties);
733 	desc->get_property = rt9471_charger_get_property;
734 	desc->set_property = rt9471_charger_set_property;
735 	desc->property_is_writeable = rt9471_charger_property_is_writeable;
736 
737 	chip->psy = devm_power_supply_register(dev, desc, &cfg);
738 
739 	return PTR_ERR_OR_ZERO(chip->psy);
740 }
741 
742 static const struct regmap_irq rt9471_regmap_irqs[] = {
743 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_BC12_DONE, 8),
744 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_DETACH, 8),
745 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_RECHG, 8),
746 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_CHG_DONE, 8),
747 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_BG_CHG, 8),
748 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_IE0C, 8),
749 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_CHG_RDY, 8),
750 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_VBUS_GD, 8),
751 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_CHG_BATOV, 8),
752 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_CHG_SYSOV, 8),
753 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_CHG_TOUT, 8),
754 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_CHG_BUSUV, 8),
755 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_CHG_THREG, 8),
756 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_CHG_AICR, 8),
757 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_CHG_MIVR, 8),
758 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_SYS_SHORT, 8),
759 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_SYS_MIN, 8),
760 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_AICC_DONE, 8),
761 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_PE_DONE, 8),
762 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_JEITA_COLD, 8),
763 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_JEITA_COOL, 8),
764 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_JEITA_WARM, 8),
765 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_JEITA_HOT, 8),
766 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_OTG_FAULT, 8),
767 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_OTG_LBP, 8),
768 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_OTG_CC, 8),
769 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_WDT, 8),
770 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_VAC_OV, 8),
771 	REGMAP_IRQ_REG_LINE(RT9471_IRQ_OTP, 8),
772 };
773 
774 static const struct regmap_irq_chip rt9471_irq_chip = {
775 	.name = "rt9471-irqs",
776 	.status_base = RT9471_REG_IRQ0,
777 	.mask_base = RT9471_REG_MASK0,
778 	.num_regs = RT9471_NUM_IRQ_REGS,
779 	.irqs = rt9471_regmap_irqs,
780 	.num_irqs = ARRAY_SIZE(rt9471_regmap_irqs),
781 };
782 
783 static const struct reg_sequence rt9471_init_regs[] = {
784 	REG_SEQ0(RT9471_REG_INFO, 0x80), /* REG_RST */
785 	REG_SEQ0(RT9471_REG_TOP, 0xC0), /* WDT = 0 */
786 	REG_SEQ0(RT9471_REG_FUNC, 0x01), /* BATFET_DIS_DLY = 0 */
787 	REG_SEQ0(RT9471_REG_IBUS, 0x0A), /* AUTO_AICR = 0 */
788 	REG_SEQ0(RT9471_REG_VBUS, 0xC6), /* VAC_OVP = 14V */
789 	REG_SEQ0(RT9471_REG_JEITA, 0x38), /* JEITA = 0 */
790 	REG_SEQ0(RT9471_REG_DPDMDET, 0x31), /* BC12_EN = 0, DCP_DP_OPT = 1 */
791 };
792 
rt9471_check_devinfo(struct rt9471_chip * chip)793 static int rt9471_check_devinfo(struct rt9471_chip *chip)
794 {
795 	struct device *dev = chip->dev;
796 	unsigned int dev_id;
797 	int ret;
798 
799 	ret = regmap_field_read(chip->rm_fields[F_DEVICE_ID], &dev_id);
800 	if (ret)
801 		return dev_err_probe(dev, ret, "Failed to read device_id\n");
802 
803 	switch (dev_id) {
804 	case RT9470_DEVID:
805 	case RT9470D_DEVID:
806 	case RT9471_DEVID:
807 	case RT9471D_DEVID:
808 		return 0;
809 	default:
810 		return dev_err_probe(dev, -ENODEV, "Incorrect device id\n");
811 	}
812 }
813 
rt9471_accessible_reg(struct device * dev,unsigned int reg)814 static bool rt9471_accessible_reg(struct device *dev, unsigned int reg)
815 {
816 	switch (reg) {
817 	case 0x00 ... 0x0F:
818 	case 0x10 ... 0x13:
819 	case 0x20 ... 0x33:
820 	case 0x40 ... 0xA1:
821 		return true;
822 	default:
823 		return false;
824 	}
825 }
826 
827 static const struct regmap_config rt9471_regmap_config = {
828 	.reg_bits = 8,
829 	.val_bits = 8,
830 	.max_register = 0xA1,
831 	.writeable_reg = rt9471_accessible_reg,
832 	.readable_reg = rt9471_accessible_reg,
833 };
834 
rt9471_probe(struct i2c_client * i2c)835 static int rt9471_probe(struct i2c_client *i2c)
836 {
837 	struct device *dev = &i2c->dev;
838 	struct rt9471_chip *chip;
839 	struct gpio_desc *ce_gpio;
840 	struct regmap *regmap;
841 	int ret;
842 
843 	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
844 	if (!chip)
845 		return -ENOMEM;
846 
847 	chip->dev = dev;
848 	mutex_init(&chip->var_lock);
849 	i2c_set_clientdata(i2c, chip);
850 
851 	/* Default pull charge enable gpio to make 'CHG_EN' by SW control only */
852 	ce_gpio = devm_gpiod_get_optional(dev, "charge-enable", GPIOD_OUT_HIGH);
853 	if (IS_ERR(ce_gpio))
854 		return dev_err_probe(dev, PTR_ERR(ce_gpio),
855 				     "Failed to config charge enable gpio\n");
856 
857 	regmap = devm_regmap_init_i2c(i2c, &rt9471_regmap_config);
858 	if (IS_ERR(regmap))
859 		return dev_err_probe(dev, PTR_ERR(regmap), "Failed to init regmap\n");
860 
861 	chip->regmap = regmap;
862 
863 	ret = devm_regmap_field_bulk_alloc(dev, regmap, chip->rm_fields,
864 					   rt9471_reg_fields,
865 					   ARRAY_SIZE(rt9471_reg_fields));
866 	if (ret)
867 		return dev_err_probe(dev, ret, "Failed to alloc regmap field\n");
868 
869 	ret = rt9471_check_devinfo(chip);
870 	if (ret)
871 		return ret;
872 
873 	ret = regmap_register_patch(regmap, rt9471_init_regs,
874 				    ARRAY_SIZE(rt9471_init_regs));
875 	if (ret)
876 		return dev_err_probe(dev, ret, "Failed to init registers\n");
877 
878 	ret = devm_regmap_add_irq_chip(dev, regmap, i2c->irq,
879 				       IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 0,
880 				       &rt9471_irq_chip, &chip->irq_chip_data);
881 	if (ret)
882 		return dev_err_probe(dev, ret, "Failed to add IRQ chip\n");
883 
884 	ret = rt9471_register_psy(chip);
885 	if (ret)
886 		return dev_err_probe(dev, ret, "Failed to register psy\n");
887 
888 	ret = rt9471_register_otg_regulator(chip);
889 	if (ret)
890 		return dev_err_probe(dev, ret, "Failed to register otg\n");
891 
892 	ret = rt9471_register_interrupts(chip);
893 	if (ret)
894 		return ret;
895 
896 	/* After IRQs are all initialized, enable port detection by default */
897 	return regmap_field_write(chip->rm_fields[F_BC12_EN], 1);
898 }
899 
rt9471_shutdown(struct i2c_client * i2c)900 static void rt9471_shutdown(struct i2c_client *i2c)
901 {
902 	struct rt9471_chip *chip = i2c_get_clientdata(i2c);
903 
904 	/*
905 	 * There's no external reset pin. Do register reset to guarantee charger
906 	 * function is normal after shutdown
907 	 */
908 	regmap_field_write(chip->rm_fields[F_REG_RST], 1);
909 }
910 
911 static const struct of_device_id rt9471_of_device_id[] = {
912 	{ .compatible = "richtek,rt9471" },
913 	{}
914 };
915 MODULE_DEVICE_TABLE(of, rt9471_of_device_id);
916 
917 static struct i2c_driver rt9471_driver = {
918 	.driver = {
919 		.name = "rt9471",
920 		.of_match_table = rt9471_of_device_id,
921 	},
922 	.probe = rt9471_probe,
923 	.shutdown = rt9471_shutdown,
924 };
925 module_i2c_driver(rt9471_driver);
926 
927 MODULE_DESCRIPTION("Richtek RT9471 charger driver");
928 MODULE_AUTHOR("Alina Yu <alina_yu@richtek.com>");
929 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
930 MODULE_LICENSE("GPL");
931