1 // SPDX-License-Identifier: GPL-2.0
2 // BQ2515X Battery Charger Driver
3 // Copyright (C) 2020 Texas Instruments Incorporated - https://www.ti.com/
4 
5 #include <linux/err.h>
6 #include <linux/i2c.h>
7 #include <linux/init.h>
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/gpio/consumer.h>
11 #include <linux/power_supply.h>
12 #include <linux/regmap.h>
13 #include <linux/types.h>
14 
15 #define BQ2515X_MANUFACTURER "Texas Instruments"
16 
17 #define BQ2515X_STAT0		0x00
18 #define BQ2515X_STAT1		0x01
19 #define BQ2515X_STAT2		0x02
20 #define BQ2515X_FLAG0		0x03
21 #define BQ2515X_FLAG1		0x04
22 #define BQ2515X_FLAG2		0x05
23 #define BQ2515X_FLAG3		0x06
24 #define BQ2515X_MASK0		0x07
25 #define BQ2515X_MASK1		0x08
26 #define BQ2515X_MASK2		0x09
27 #define BQ2515X_MASK3		0x0a
28 #define BQ2515X_VBAT_CTRL	0x12
29 #define BQ2515X_ICHG_CTRL	0x13
30 #define BQ2515X_PCHRGCTRL	0x14
31 #define BQ2515X_TERMCTRL	0x15
32 #define BQ2515X_BUVLO		0x16
33 #define BQ2515X_CHARGERCTRL0	0x17
34 #define BQ2515X_CHARGERCTRL1	0x18
35 #define BQ2515X_ILIMCTRL	0x19
36 #define BQ2515X_LDOCTRL		0x1d
37 #define BQ2515X_MRCTRL		0x30
38 #define BQ2515X_ICCTRL0		0x35
39 #define BQ2515X_ICCTRL1		0x36
40 #define BQ2515X_ICCTRL2		0x37
41 #define BQ2515X_ADCCTRL0	0x40
42 #define BQ2515X_ADCCTRL1	0x41
43 #define BQ2515X_ADC_VBAT_M	0x42
44 #define BQ2515X_ADC_VBAT_L	0x43
45 #define BQ2515X_ADC_TS_M	0x44
46 #define BQ2515X_ADC_TS_L	0x45
47 #define BQ2515X_ADC_ICHG_M	0x46
48 #define BQ2515X_ADC_ICHG_L	0x47
49 #define BQ2515X_ADC_ADCIN_M	0x48
50 #define BQ2515X_ADC_ADCIN_L	0x49
51 #define BQ2515X_ADC_VIN_M	0x4a
52 #define BQ2515X_ADC_VIN_L	0x4b
53 #define BQ2515X_ADC_PMID_M	0x4c
54 #define BQ2515X_ADC_PMID_L	0x4d
55 #define BQ2515X_ADC_IIN_M	0x4e
56 #define BQ2515X_ADC_IIN_L	0x4f
57 #define BQ2515X_ADC_COMP1_M	0x52
58 #define BQ2515X_ADC_COMP1_L	0X53
59 #define BQ2515X_ADC_COMP2_M	0X54
60 #define BQ2515X_ADC_COMP2_L	0x55
61 #define BQ2515X_ADC_COMP3_M	0x56
62 #define BQ2515X_ADC_COMP3_L	0x57
63 #define BQ2515X_ADC_READ_EN	0x58
64 #define BQ2515X_TS_FASTCHGCTRL	0x61
65 #define BQ2515X_TS_COLD		0x62
66 #define BQ2515X_TS_COOL		0x63
67 #define BQ2515X_TS_WARM		0x64
68 #define BQ2515X_TS_HOT		0x65
69 #define BQ2515X_DEVICE_ID	0x6f
70 
71 #define BQ2515X_DEFAULT_ICHG_UA		10000
72 #define BQ25150_DEFAULT_ILIM_UA		100000
73 #define BQ25155_DEFAULT_ILIM_UA		500000
74 #define BQ2515X_DEFAULT_VBAT_REG_UV	4200000
75 #define BQ2515X_DEFAULT_IPRECHARGE_UA	2500
76 
77 #define BQ2515X_DIVISOR				65536
78 #define BQ2515X_VBAT_BASE_VOLT			3600000
79 #define BQ2515X_VBAT_REG_MAX			4600000
80 #define BQ2515X_VBAT_REG_MIN			3600000
81 #define BQ2515X_VBAT_STEP_UV			10000
82 #define BQ2515X_UV_FACTOR			1000000
83 #define BQ2515X_VBAT_MULTIPLIER			6
84 #define BQ2515X_ICHG_DIVISOR			52429
85 #define BQ2515X_ICHG_CURR_STEP_THRESH_UA	318750
86 #define BQ2515X_ICHG_MIN_UA			0
87 #define BQ2515X_ICHG_MAX_UA			500000
88 #define BQ2515X_ICHG_RNG_1B0_UA			1250
89 #define BQ2515X_ICHG_RNG_1B1_UA			2500
90 #define BQ2515X_VLOWV_SEL_1B0_UV		3000000
91 #define BQ2515X_VLOWV_SEL_1B1_UV		2800000
92 #define BQ2515X_PRECHRG_ICHRG_RNGE_1875_UA	18750
93 #define BQ2515X_PRECHRG_ICHRG_RNGE_3750_UA	37500
94 #define BQ2515X_TWAKE2_MIN_US			1700000
95 #define BQ2515X_TWAKE2_MAX_US			2300000
96 
97 #define BQ2515X_ILIM_150MA	0x2
98 #define BQ2515X_ILIM_MASK	0x7
99 #define BQ2515X_ILIM_MIN	50000
100 #define BQ2515X_ILIM_MAX	600000
101 #define BQ2515X_HEALTH_MASK	0xf
102 #define BQ2515X_ICHGRNG_MASK	0x80
103 #define BQ2515X_STAT0_MASK	0x0f
104 #define BQ2515X_STAT1_MASK	0x1f
105 #define BQ2515X_PRECHARGE_MASK	0x1f
106 
107 #define BQ2515X_TS_HOT_STAT		BIT(0)
108 #define BQ2515X_TS_WARM_STAT		BIT(1)
109 #define BQ2515X_TS_COOL_STAT		BIT(2)
110 #define BQ2515X_TS_COLD_STAT		BIT(3)
111 #define BQ2515X_SAFETY_TIMER_EXP	BIT(5)
112 
113 #define BQ2515X_EN_VBAT_READ		BIT(3)
114 #define BQ2515X_EN_ICHG_READ		BIT(5)
115 
116 #define BQ2515X_VIN_GOOD		BIT(0)
117 #define BQ2515X_CHRG_DONE		BIT(5)
118 #define BQ2515X_CV_CHRG_MODE		BIT(6)
119 
120 #define BQ2515X_VIN_OVP_FAULT_STAT	BIT(7)
121 
122 #define BQ2515X_WATCHDOG_DISABLE	BIT(4)
123 
124 #define BQ2515X_ICHARGE_RANGE		BIT(7)
125 
126 #define BQ2515X_VLOWV_SEL		BIT(5)
127 
128 #define BQ2515X_CHARGER_DISABLE		BIT(0)
129 
130 #define BQ2515X_HWRESET_14S_WD		BIT(1)
131 
132 static const int bq2515x_ilim_lvl_values[] = {
133 	50000, 100000, 150000, 200000, 300000, 400000, 500000, 600000
134 };
135 
136 /**
137  * struct bq2515x_init_data -
138  * @ilim: input current limit
139  * @ichg: fast charge current
140  * @vbatreg: battery regulation voltage
141  * @iprechg: precharge current
142  */
143 struct bq2515x_init_data {
144 	int ilim;
145 	int ichg;
146 	int vbatreg;
147 	int iprechg;
148 };
149 
150 enum bq2515x_id {
151 	BQ25150,
152 	BQ25155,
153 };
154 
155 /**
156  * struct bq2515x_device -
157  * @mains: mains properties
158  * @battery: battery properties
159  * @regmap: register map structure
160  * @dev: device structure
161  *
162  * @reset_gpio: manual reset (MR) pin
163  * @powerdown_gpio: low power mode pin
164  * @ac_detect_gpio: power good (PG) pin
165  * @ce_gpio: charge enable (CE) pin
166  *
167  * @model_name: string value describing device model
168  * @device_id: value of device_id
169  * @mains_online: boolean value indicating power supply online
170  *
171  * @init_data: charger initialization data structure
172  */
173 struct bq2515x_device {
174 	struct power_supply *mains;
175 	struct power_supply *battery;
176 	struct regmap *regmap;
177 	struct device *dev;
178 
179 	struct gpio_desc *reset_gpio;
180 	struct gpio_desc *powerdown_gpio;
181 	struct gpio_desc *ac_detect_gpio;
182 	struct gpio_desc *ce_gpio;
183 
184 	char model_name[I2C_NAME_SIZE];
185 	int device_id;
186 	bool mains_online;
187 
188 	struct bq2515x_init_data init_data;
189 };
190 
191 static const struct reg_default bq25150_reg_defaults[] = {
192 	{BQ2515X_FLAG0, 0x0},
193 	{BQ2515X_FLAG1, 0x0},
194 	{BQ2515X_FLAG2, 0x0},
195 	{BQ2515X_FLAG3, 0x0},
196 	{BQ2515X_MASK0, 0x0},
197 	{BQ2515X_MASK1, 0x0},
198 	{BQ2515X_MASK2, 0x71},
199 	{BQ2515X_MASK3, 0x0},
200 	{BQ2515X_VBAT_CTRL, 0x3C},
201 	{BQ2515X_ICHG_CTRL, 0x8},
202 	{BQ2515X_PCHRGCTRL, 0x2},
203 	{BQ2515X_TERMCTRL, 0x14},
204 	{BQ2515X_BUVLO, 0x0},
205 	{BQ2515X_CHARGERCTRL0, 0x82},
206 	{BQ2515X_CHARGERCTRL1, 0x42},
207 	{BQ2515X_ILIMCTRL, 0x1},
208 	{BQ2515X_LDOCTRL, 0xB0},
209 	{BQ2515X_MRCTRL, 0x2A},
210 	{BQ2515X_ICCTRL0, 0x10},
211 	{BQ2515X_ICCTRL1, 0x0},
212 	{BQ2515X_ICCTRL2, 0x0},
213 	{BQ2515X_ADCCTRL0, 0x2},
214 	{BQ2515X_ADCCTRL1, 0x40},
215 	{BQ2515X_ADC_COMP1_M, 0x23},
216 	{BQ2515X_ADC_COMP1_L, 0x20},
217 	{BQ2515X_ADC_COMP2_M, 0x38},
218 	{BQ2515X_ADC_COMP2_L, 0x90},
219 	{BQ2515X_ADC_COMP3_M, 0x0},
220 	{BQ2515X_ADC_COMP3_L, 0x0},
221 	{BQ2515X_ADC_READ_EN, 0x0},
222 	{BQ2515X_TS_FASTCHGCTRL, 0x34},
223 	{BQ2515X_TS_COLD, 0x7C},
224 	{BQ2515X_TS_COOL, 0x6D},
225 	{BQ2515X_TS_WARM, 0x38},
226 	{BQ2515X_TS_HOT, 0x27},
227 	{BQ2515X_DEVICE_ID, 0x20},
228 };
229 
230 static const struct reg_default bq25155_reg_defaults[] = {
231 	{BQ2515X_FLAG0, 0x0},
232 	{BQ2515X_FLAG1, 0x0},
233 	{BQ2515X_FLAG2, 0x0},
234 	{BQ2515X_FLAG3, 0x0},
235 	{BQ2515X_MASK0, 0x0},
236 	{BQ2515X_MASK1, 0x0},
237 	{BQ2515X_MASK2, 0x71},
238 	{BQ2515X_MASK3, 0x0},
239 	{BQ2515X_VBAT_CTRL, 0x3C},
240 	{BQ2515X_ICHG_CTRL, 0x8},
241 	{BQ2515X_PCHRGCTRL, 0x2},
242 	{BQ2515X_TERMCTRL, 0x14},
243 	{BQ2515X_BUVLO, 0x0},
244 	{BQ2515X_CHARGERCTRL0, 0x82},
245 	{BQ2515X_CHARGERCTRL1, 0xC2},
246 	{BQ2515X_ILIMCTRL, 0x6},
247 	{BQ2515X_LDOCTRL, 0xB0},
248 	{BQ2515X_MRCTRL, 0x2A},
249 	{BQ2515X_ICCTRL0, 0x10},
250 	{BQ2515X_ICCTRL1, 0x0},
251 	{BQ2515X_ICCTRL2, 0x40},
252 	{BQ2515X_ADCCTRL0, 0x2},
253 	{BQ2515X_ADCCTRL1, 0x40},
254 	{BQ2515X_ADC_COMP1_M, 0x23},
255 	{BQ2515X_ADC_COMP1_L, 0x20},
256 	{BQ2515X_ADC_COMP2_M, 0x38},
257 	{BQ2515X_ADC_COMP2_L, 0x90},
258 	{BQ2515X_ADC_COMP3_M, 0x0},
259 	{BQ2515X_ADC_COMP3_L, 0x0},
260 	{BQ2515X_ADC_READ_EN, 0x0},
261 	{BQ2515X_TS_FASTCHGCTRL, 0x34},
262 	{BQ2515X_TS_COLD, 0x7C},
263 	{BQ2515X_TS_COOL, 0x6D},
264 	{BQ2515X_TS_WARM, 0x38},
265 	{BQ2515X_TS_HOT, 0x27},
266 	{BQ2515X_DEVICE_ID, 0x35},
267 };
268 
269 static int bq2515x_wake_up(struct bq2515x_device *bq2515x)
270 {
271 	int ret;
272 	int val;
273 
274 	/* Read the STAT register if we can read it then the device is out
275 	 * of ship mode.  If the register cannot be read then attempt to wake
276 	 * it up and enable the ADC.
277 	 */
278 	ret = regmap_read(bq2515x->regmap, BQ2515X_STAT0, &val);
279 	if (ret)
280 		return ret;
281 
282 	/* Need to toggle LP and bring device out of ship mode. The device
283 	 * will exit the ship mode when the MR pin is held low for at least
284 	 * t_WAKE2 as shown in section 8.3.7.1 of the datasheet.
285 	 */
286 	gpiod_set_value_cansleep(bq2515x->powerdown_gpio, 0);
287 
288 	gpiod_set_value_cansleep(bq2515x->reset_gpio, 0);
289 	usleep_range(BQ2515X_TWAKE2_MIN_US, BQ2515X_TWAKE2_MAX_US);
290 	gpiod_set_value_cansleep(bq2515x->reset_gpio, 1);
291 
292 	return regmap_write(bq2515x->regmap, BQ2515X_ADC_READ_EN,
293 				(BQ2515X_EN_VBAT_READ | BQ2515X_EN_ICHG_READ));
294 }
295 
296 static int bq2515x_update_ps_status(struct bq2515x_device *bq2515x)
297 {
298 	bool dc = false;
299 	unsigned int val;
300 	int ret;
301 
302 	if (bq2515x->ac_detect_gpio)
303 		val = gpiod_get_value_cansleep(bq2515x->ac_detect_gpio);
304 	else {
305 		ret = regmap_read(bq2515x->regmap, BQ2515X_STAT0, &val);
306 		if (ret)
307 			return ret;
308 	}
309 
310 	dc = val & BQ2515X_VIN_GOOD;
311 
312 	ret = bq2515x->mains_online != dc;
313 
314 	bq2515x->mains_online = dc;
315 
316 	return ret;
317 }
318 
319 static int bq2515x_disable_watchdog_timers(struct bq2515x_device *bq2515x)
320 {
321 	int ret;
322 
323 	ret = regmap_update_bits(bq2515x->regmap, BQ2515X_CHARGERCTRL0,
324 			BQ2515X_WATCHDOG_DISABLE, BQ2515X_WATCHDOG_DISABLE);
325 	if (ret)
326 		return ret;
327 
328 	return regmap_update_bits(bq2515x->regmap, BQ2515X_ICCTRL2,
329 						BQ2515X_HWRESET_14S_WD, 0);
330 }
331 
332 static int bq2515x_get_battery_voltage_now(struct bq2515x_device *bq2515x)
333 {
334 	int ret;
335 	int vbat_msb;
336 	int vbat_lsb;
337 	uint32_t vbat_measurement;
338 
339 	if (!bq2515x->mains_online)
340 		bq2515x_wake_up(bq2515x);
341 
342 	ret = regmap_read(bq2515x->regmap, BQ2515X_ADC_VBAT_M, &vbat_msb);
343 	if (ret)
344 		return ret;
345 
346 	ret = regmap_read(bq2515x->regmap, BQ2515X_ADC_VBAT_L, &vbat_lsb);
347 	if (ret)
348 		return ret;
349 
350 	vbat_measurement = (vbat_msb << 8) | vbat_lsb;
351 
352 	return vbat_measurement * (BQ2515X_UV_FACTOR / BQ2515X_DIVISOR) *
353 						BQ2515X_VBAT_MULTIPLIER;
354 }
355 
356 static int bq2515x_get_battery_current_now(struct bq2515x_device *bq2515x)
357 {
358 	int ret;
359 	int ichg_msb;
360 	int ichg_lsb;
361 	uint32_t ichg_measurement;
362 	u16 ichg_multiplier = BQ2515X_ICHG_RNG_1B0_UA;
363 	unsigned int ichg_reg_code, reg_code;
364 	unsigned int icharge_range = 0, pchrgctrl;
365 	unsigned int buvlo, vlowv_sel, vlowv = BQ2515X_VLOWV_SEL_1B0_UV;
366 
367 	if (!bq2515x->mains_online)
368 		return -ENODATA;
369 
370 	ret = regmap_read(bq2515x->regmap, BQ2515X_ADC_ICHG_M, &ichg_msb);
371 	if (ret)
372 		return ret;
373 
374 	ret = regmap_read(bq2515x->regmap, BQ2515X_ADC_ICHG_L, &ichg_lsb);
375 	if (ret)
376 		return ret;
377 
378 	ichg_measurement = (ichg_msb << 8) | ichg_lsb;
379 
380 	ret = regmap_read(bq2515x->regmap, BQ2515X_BUVLO, &buvlo);
381 	if (ret)
382 		return ret;
383 
384 	vlowv_sel = buvlo & BQ2515X_VLOWV_SEL;
385 
386 	if (vlowv_sel)
387 		vlowv = BQ2515X_VLOWV_SEL_1B1_UV;
388 
389 	if (bq2515x_get_battery_voltage_now(bq2515x) < vlowv) {
390 		ret = regmap_read(bq2515x->regmap, BQ2515X_PCHRGCTRL,
391 								&pchrgctrl);
392 		if (ret)
393 			return ret;
394 
395 		reg_code = pchrgctrl & BQ2515X_PRECHARGE_MASK;
396 	} else {
397 		ret = regmap_read(bq2515x->regmap, BQ2515X_ICHG_CTRL,
398 							&ichg_reg_code);
399 		if (ret)
400 			return ret;
401 
402 		reg_code = ichg_reg_code;
403 	}
404 
405 	ret = regmap_read(bq2515x->regmap, BQ2515X_PCHRGCTRL, &pchrgctrl);
406 	if (ret)
407 		return ret;
408 
409 	icharge_range = pchrgctrl & BQ2515X_ICHARGE_RANGE;
410 
411 	if (icharge_range)
412 		ichg_multiplier = BQ2515X_ICHG_RNG_1B1_UA;
413 
414 	return reg_code * (ichg_multiplier * ichg_measurement /
415 							BQ2515X_ICHG_DIVISOR);
416 }
417 
418 static bool bq2515x_get_charge_disable(struct bq2515x_device *bq2515x)
419 {
420 	int ret;
421 	int ce_pin;
422 	int icctrl2;
423 	int charger_disable;
424 
425 	ce_pin = gpiod_get_value_cansleep(bq2515x->ce_gpio);
426 
427 	ret = regmap_read(bq2515x->regmap, BQ2515X_ICCTRL2, &icctrl2);
428 	if (ret)
429 		return ret;
430 
431 	charger_disable = icctrl2 & BQ2515X_CHARGER_DISABLE;
432 
433 	if (charger_disable || ce_pin)
434 		return true;
435 
436 	return false;
437 }
438 
439 static int bq2515x_set_charge_disable(struct bq2515x_device *bq2515x, int val)
440 {
441 	gpiod_set_value_cansleep(bq2515x->ce_gpio, val);
442 
443 	return regmap_update_bits(bq2515x->regmap, BQ2515X_ICCTRL2,
444 					BQ2515X_CHARGER_DISABLE, val);
445 }
446 
447 static int bq2515x_get_const_charge_current(struct bq2515x_device *bq2515x)
448 {
449 	int ret;
450 	u16 ichg_multiplier = BQ2515X_ICHG_RNG_1B0_UA;
451 	unsigned int ichg_reg_code;
452 	unsigned int pchrgctrl;
453 	unsigned int icharge_range;
454 
455 	ret = regmap_read(bq2515x->regmap, BQ2515X_ICHG_CTRL, &ichg_reg_code);
456 	if (ret)
457 		return ret;
458 
459 	ret = regmap_read(bq2515x->regmap, BQ2515X_PCHRGCTRL, &pchrgctrl);
460 	if (ret)
461 		return ret;
462 
463 	icharge_range = pchrgctrl & BQ2515X_ICHARGE_RANGE;
464 
465 	if (icharge_range)
466 		ichg_multiplier = BQ2515X_ICHG_RNG_1B1_UA;
467 
468 	return ichg_reg_code * ichg_multiplier;
469 }
470 
471 static int bq2515x_set_const_charge_current(struct bq2515x_device *bq2515x,
472 								int val)
473 {
474 	int ret;
475 	unsigned int ichg_reg_code;
476 	u16 ichg_multiplier = BQ2515X_ICHG_RNG_1B0_UA;
477 	unsigned int icharge_range = 0;
478 
479 	if (val > BQ2515X_ICHG_MAX_UA || val < BQ2515X_ICHG_MIN_UA)
480 		return -EINVAL;
481 
482 	if (val > BQ2515X_ICHG_CURR_STEP_THRESH_UA) {
483 		ichg_multiplier = BQ2515X_ICHG_RNG_1B1_UA;
484 		icharge_range = BQ2515X_ICHARGE_RANGE;
485 	}
486 
487 	bq2515x_set_charge_disable(bq2515x, 1);
488 
489 	ret = regmap_update_bits(bq2515x->regmap, BQ2515X_PCHRGCTRL,
490 					BQ2515X_ICHARGE_RANGE, icharge_range);
491 	if (ret)
492 		return ret;
493 
494 	ichg_reg_code = val / ichg_multiplier;
495 
496 	ret = regmap_write(bq2515x->regmap, BQ2515X_ICHG_CTRL, ichg_reg_code);
497 	if (ret)
498 		return ret;
499 
500 	return bq2515x_set_charge_disable(bq2515x, 0);
501 }
502 
503 static int bq2515x_get_precharge_current(struct bq2515x_device *bq2515x)
504 {
505 	int ret;
506 	unsigned int pchrgctrl;
507 	unsigned int icharge_range;
508 	u16 precharge_multiplier = BQ2515X_ICHG_RNG_1B0_UA;
509 	unsigned int precharge_reg_code;
510 
511 	ret = regmap_read(bq2515x->regmap, BQ2515X_PCHRGCTRL, &pchrgctrl);
512 	if (ret)
513 		return ret;
514 
515 	icharge_range = pchrgctrl & BQ2515X_ICHARGE_RANGE;
516 
517 	if (icharge_range)
518 		precharge_multiplier = BQ2515X_ICHG_RNG_1B1_UA;
519 
520 	precharge_reg_code = pchrgctrl & BQ2515X_PRECHARGE_MASK;
521 
522 	return precharge_reg_code * precharge_multiplier;
523 }
524 
525 static int bq2515x_set_precharge_current(struct bq2515x_device *bq2515x,
526 					int val)
527 {
528 	int ret;
529 	unsigned int pchrgctrl;
530 	unsigned int icharge_range;
531 	unsigned int precharge_reg_code;
532 	unsigned int precharge_multiplier = BQ2515X_ICHG_RNG_1B0_UA;
533 	unsigned int precharge_max_ua = BQ2515X_PRECHRG_ICHRG_RNGE_1875_UA;
534 
535 	ret = regmap_read(bq2515x->regmap, BQ2515X_PCHRGCTRL, &pchrgctrl);
536 	if (ret)
537 		return ret;
538 
539 	icharge_range = pchrgctrl & BQ2515X_ICHARGE_RANGE;
540 
541 	if (icharge_range) {
542 		precharge_max_ua = BQ2515X_PRECHRG_ICHRG_RNGE_3750_UA;
543 		precharge_multiplier = BQ2515X_ICHG_RNG_1B1_UA;
544 	} else {
545 		precharge_max_ua = BQ2515X_PRECHRG_ICHRG_RNGE_1875_UA;
546 		precharge_multiplier = BQ2515X_ICHG_RNG_1B0_UA;
547 	}
548 	if (val > precharge_max_ua || val < BQ2515X_ICHG_MIN_UA)
549 		return -EINVAL;
550 
551 	precharge_reg_code = val / precharge_multiplier;
552 
553 	ret = bq2515x_set_charge_disable(bq2515x, 1);
554 	if (ret)
555 		return ret;
556 
557 	ret = regmap_update_bits(bq2515x->regmap, BQ2515X_PCHRGCTRL,
558 				BQ2515X_PRECHARGE_MASK, precharge_reg_code);
559 	if (ret)
560 		return ret;
561 
562 	return bq2515x_set_charge_disable(bq2515x, 0);
563 }
564 
565 static int bq2515x_charging_status(struct bq2515x_device *bq2515x,
566 				   union power_supply_propval *val)
567 {
568 	bool status0_no_fault;
569 	bool status1_no_fault;
570 	bool ce_status;
571 	bool charge_done;
572 	unsigned int status;
573 	int ret;
574 
575 	if (!bq2515x->mains_online) {
576 		val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
577 		return 0;
578 	}
579 
580 	ret = regmap_read(bq2515x->regmap, BQ2515X_STAT0, &status);
581 	if (ret)
582 		return ret;
583 
584 	/*
585 	 * The code block below is used to determine if any faults from the
586 	 * STAT0 register are disbaling charging or if the charge has completed
587 	 * according to the CHARGE_DONE_STAT bit.
588 	 */
589 	if (((status & BQ2515X_STAT0_MASK) == true) &
590 			((status & BQ2515X_CHRG_DONE) == false)) {
591 		status0_no_fault = true;
592 		charge_done = false;
593 	} else if (status & BQ2515X_CHRG_DONE) {
594 		charge_done = true;
595 		status0_no_fault = false;
596 	} else {
597 		status0_no_fault = false;
598 		charge_done = false;
599 	}
600 
601 	ret = regmap_read(bq2515x->regmap, BQ2515X_STAT1, &status);
602 	if (ret)
603 		return ret;
604 	/*
605 	 * The code block below is used to determine if any faults from the
606 	 * STAT1 register are disbaling charging
607 	 */
608 	if ((status & BQ2515X_STAT1_MASK) == false)
609 		status1_no_fault = true;
610 	else
611 		status1_no_fault = false;
612 
613 	ce_status = (!bq2515x_get_charge_disable(bq2515x));
614 
615 	/*
616 	 * If there are no faults and charging is enabled, then status is
617 	 * charging. Otherwise, if charging is complete, then status is full.
618 	 * Otherwise, if a fault exists or charging is disabled, then status is
619 	 * not charging
620 	 */
621 	if (status0_no_fault & status1_no_fault & ce_status)
622 		val->intval = POWER_SUPPLY_STATUS_CHARGING;
623 	else if (charge_done)
624 		val->intval = POWER_SUPPLY_STATUS_FULL;
625 	else if (!(status0_no_fault & status1_no_fault & ce_status))
626 		val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
627 
628 	return 0;
629 }
630 
631 static int bq2515x_get_batt_reg(struct bq2515x_device *bq2515x)
632 {
633 	int vbat_reg_code;
634 	int ret;
635 
636 	ret = regmap_read(bq2515x->regmap, BQ2515X_VBAT_CTRL, &vbat_reg_code);
637 	if (ret)
638 		return ret;
639 
640 	return BQ2515X_VBAT_BASE_VOLT + vbat_reg_code * BQ2515X_VBAT_STEP_UV;
641 }
642 
643 static int bq2515x_set_batt_reg(struct bq2515x_device *bq2515x, int val)
644 {
645 	int vbat_reg_code;
646 
647 	if (val > BQ2515X_VBAT_REG_MAX || val < BQ2515X_VBAT_REG_MIN)
648 		return -EINVAL;
649 
650 	vbat_reg_code = (val - BQ2515X_VBAT_BASE_VOLT) / BQ2515X_VBAT_STEP_UV;
651 
652 	return regmap_write(bq2515x->regmap, BQ2515X_VBAT_CTRL, vbat_reg_code);
653 }
654 
655 static int bq2515x_get_ilim_lvl(struct bq2515x_device *bq2515x)
656 {
657 	int ret;
658 	int ilimctrl;
659 
660 	ret = regmap_read(bq2515x->regmap, BQ2515X_ILIMCTRL, &ilimctrl);
661 	if (ret)
662 		return ret;
663 
664 	return bq2515x_ilim_lvl_values[ilimctrl & BQ2515X_ILIM_MASK];
665 }
666 
667 static int bq2515x_set_ilim_lvl(struct bq2515x_device *bq2515x, int val)
668 {
669 	int i = 0;
670 	unsigned int array_size = ARRAY_SIZE(bq2515x_ilim_lvl_values);
671 
672 	for (i = array_size - 1; i > 0; i--) {
673 		if (val >= bq2515x_ilim_lvl_values[i])
674 			break;
675 	}
676 	return regmap_write(bq2515x->regmap, BQ2515X_ILIMCTRL, i);
677 }
678 
679 static int bq2515x_power_supply_property_is_writeable(struct power_supply *psy,
680 					enum power_supply_property prop)
681 {
682 	switch (prop) {
683 	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
684 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
685 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
686 	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
687 		return true;
688 	default:
689 		return false;
690 	}
691 }
692 
693 static int bq2515x_charger_get_health(struct bq2515x_device *bq2515x,
694 				      union power_supply_propval *val)
695 {
696 	int health = POWER_SUPPLY_HEALTH_GOOD;
697 	int ret;
698 	unsigned int stat1;
699 	unsigned int flag3;
700 
701 	if (!bq2515x->mains_online)
702 		bq2515x_wake_up(bq2515x);
703 
704 	ret = regmap_read(bq2515x->regmap, BQ2515X_FLAG3, &flag3);
705 	if (ret)
706 		return ret;
707 
708 	ret = regmap_read(bq2515x->regmap, BQ2515X_STAT1, &stat1);
709 	if (ret)
710 		return ret;
711 
712 	if (stat1 & BQ2515X_HEALTH_MASK) {
713 		switch (stat1 & BQ2515X_HEALTH_MASK) {
714 		case BQ2515X_TS_HOT_STAT:
715 			health = POWER_SUPPLY_HEALTH_HOT;
716 			break;
717 		case BQ2515X_TS_WARM_STAT:
718 			health = POWER_SUPPLY_HEALTH_WARM;
719 			break;
720 		case BQ2515X_TS_COOL_STAT:
721 			health = POWER_SUPPLY_HEALTH_COOL;
722 			break;
723 		case BQ2515X_TS_COLD_STAT:
724 			health = POWER_SUPPLY_HEALTH_COLD;
725 			break;
726 		default:
727 			health = POWER_SUPPLY_HEALTH_UNKNOWN;
728 			break;
729 		}
730 	}
731 
732 	if (stat1 & BQ2515X_VIN_OVP_FAULT_STAT)
733 		health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
734 
735 	if (flag3 & BQ2515X_SAFETY_TIMER_EXP)
736 		health = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
737 
738 	val->intval = health;
739 	return 0;
740 }
741 
742 static int bq2515x_mains_set_property(struct power_supply *psy,
743 		enum power_supply_property prop,
744 		const union power_supply_propval *val)
745 {
746 	struct bq2515x_device *bq2515x = power_supply_get_drvdata(psy);
747 	int ret;
748 
749 	switch (prop) {
750 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
751 		ret = bq2515x_set_batt_reg(bq2515x, val->intval);
752 		break;
753 
754 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
755 		ret = bq2515x_set_const_charge_current(bq2515x, val->intval);
756 		break;
757 
758 	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
759 		ret = bq2515x_set_ilim_lvl(bq2515x, val->intval);
760 		break;
761 
762 	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
763 		ret = bq2515x_set_precharge_current(bq2515x, val->intval);
764 		break;
765 
766 	default:
767 		return -EINVAL;
768 	}
769 
770 	return ret;
771 }
772 
773 static int bq2515x_mains_get_property(struct power_supply *psy,
774 				     enum power_supply_property prop,
775 				     union power_supply_propval *val)
776 {
777 	struct bq2515x_device *bq2515x = power_supply_get_drvdata(psy);
778 	int ret = 0;
779 
780 	switch (prop) {
781 
782 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
783 		ret = bq2515x_get_const_charge_current(bq2515x);
784 		if (ret < 0)
785 			return ret;
786 
787 		val->intval = ret;
788 		break;
789 
790 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
791 		ret = bq2515x_get_batt_reg(bq2515x);
792 		if (ret < 0)
793 			return ret;
794 		val->intval = ret;
795 		break;
796 
797 	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
798 		ret = bq2515x_get_precharge_current(bq2515x);
799 		if (ret < 0)
800 			return ret;
801 		val->intval = ret;
802 		break;
803 
804 	case POWER_SUPPLY_PROP_ONLINE:
805 		val->intval = bq2515x->mains_online;
806 		break;
807 
808 	case POWER_SUPPLY_PROP_HEALTH:
809 		ret = bq2515x_charger_get_health(bq2515x, val);
810 		if (ret)
811 			val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
812 		break;
813 
814 	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
815 		ret = bq2515x_get_ilim_lvl(bq2515x);
816 		if (ret < 0)
817 			return ret;
818 		val->intval = ret;
819 		break;
820 
821 	case POWER_SUPPLY_PROP_MODEL_NAME:
822 		val->strval = bq2515x->model_name;
823 		break;
824 
825 	case POWER_SUPPLY_PROP_MANUFACTURER:
826 		val->strval = BQ2515X_MANUFACTURER;
827 		break;
828 
829 	case POWER_SUPPLY_PROP_STATUS:
830 		ret = bq2515x_charging_status(bq2515x, val);
831 		if (ret)
832 			return ret;
833 		break;
834 
835 	default:
836 		return -EINVAL;
837 	}
838 
839 	return ret;
840 }
841 
842 static int bq2515x_battery_get_property(struct power_supply *psy,
843 				       enum power_supply_property prop,
844 				       union power_supply_propval *val)
845 {
846 	struct bq2515x_device *bq2515x = power_supply_get_drvdata(psy);
847 	int ret;
848 
849 	ret = bq2515x_update_ps_status(bq2515x);
850 	if (ret)
851 		return ret;
852 
853 	switch (prop) {
854 
855 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
856 		ret = bq2515x->init_data.vbatreg;
857 		if (ret < 0)
858 			return ret;
859 		val->intval = ret;
860 		break;
861 
862 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
863 		ret = bq2515x->init_data.ichg;
864 		if (ret < 0)
865 			return ret;
866 		val->intval = ret;
867 		break;
868 
869 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
870 		ret = bq2515x_get_battery_voltage_now(bq2515x);
871 		if (ret < 0)
872 			return ret;
873 		val->intval = ret;
874 		break;
875 
876 	case POWER_SUPPLY_PROP_CURRENT_NOW:
877 		ret = bq2515x_get_battery_current_now(bq2515x);
878 		if (ret < 0)
879 			return ret;
880 		val->intval = ret;
881 		break;
882 
883 	default:
884 		return -EINVAL;
885 	}
886 	return 0;
887 }
888 
889 static const enum power_supply_property bq2515x_battery_properties[] = {
890 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
891 	POWER_SUPPLY_PROP_CURRENT_NOW,
892 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
893 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
894 };
895 
896 static const enum power_supply_property bq2515x_mains_properties[] = {
897 	POWER_SUPPLY_PROP_ONLINE,
898 	POWER_SUPPLY_PROP_STATUS,
899 	POWER_SUPPLY_PROP_HEALTH,
900 	POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
901 	POWER_SUPPLY_PROP_MODEL_NAME,
902 	POWER_SUPPLY_PROP_MANUFACTURER,
903 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
904 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
905 	POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
906 };
907 
908 static const struct power_supply_desc bq2515x_mains_desc = {
909 	.name			= "bq2515x-mains",
910 	.type			= POWER_SUPPLY_TYPE_MAINS,
911 	.get_property		= bq2515x_mains_get_property,
912 	.set_property		= bq2515x_mains_set_property,
913 	.properties		= bq2515x_mains_properties,
914 	.num_properties		= ARRAY_SIZE(bq2515x_mains_properties),
915 	.property_is_writeable	= bq2515x_power_supply_property_is_writeable,
916 };
917 
918 static const struct power_supply_desc bq2515x_battery_desc = {
919 	.name			= "bq2515x-battery",
920 	.type			= POWER_SUPPLY_TYPE_BATTERY,
921 	.get_property		= bq2515x_battery_get_property,
922 	.properties		= bq2515x_battery_properties,
923 	.num_properties		= ARRAY_SIZE(bq2515x_battery_properties),
924 	.property_is_writeable	= bq2515x_power_supply_property_is_writeable,
925 };
926 
927 static int bq2515x_power_supply_register(struct bq2515x_device *bq2515x,
928 		struct device *dev, struct power_supply_config psy_cfg)
929 {
930 	bq2515x->mains = devm_power_supply_register(bq2515x->dev,
931 						    &bq2515x_mains_desc,
932 						    &psy_cfg);
933 	if (IS_ERR(bq2515x->mains))
934 		return -EINVAL;
935 
936 	bq2515x->battery = devm_power_supply_register(bq2515x->dev,
937 						      &bq2515x_battery_desc,
938 						      &psy_cfg);
939 	if (IS_ERR(bq2515x->battery))
940 		return -EINVAL;
941 
942 	return 0;
943 }
944 
945 static int bq2515x_hw_init(struct bq2515x_device *bq2515x)
946 {
947 	int ret;
948 	struct power_supply_battery_info bat_info = { };
949 
950 	ret = bq2515x_disable_watchdog_timers(bq2515x);
951 	if (ret)
952 		return ret;
953 
954 	if (bq2515x->init_data.ilim) {
955 		ret = bq2515x_set_ilim_lvl(bq2515x, bq2515x->init_data.ilim);
956 		if (ret)
957 			return ret;
958 	}
959 
960 	ret = power_supply_get_battery_info(bq2515x->mains, &bat_info);
961 	if (ret) {
962 		dev_warn(bq2515x->dev, "battery info missing, default values will be applied\n");
963 
964 		bq2515x->init_data.ichg = BQ2515X_DEFAULT_ICHG_UA;
965 
966 		bq2515x->init_data.vbatreg = BQ2515X_DEFAULT_VBAT_REG_UV;
967 
968 		bq2515x->init_data.iprechg = BQ2515X_DEFAULT_IPRECHARGE_UA;
969 
970 	} else {
971 		bq2515x->init_data.ichg =
972 				bat_info.constant_charge_current_max_ua;
973 
974 		bq2515x->init_data.vbatreg =
975 				bat_info.constant_charge_voltage_max_uv;
976 
977 		bq2515x->init_data.iprechg =
978 				bat_info.precharge_current_ua;
979 	}
980 
981 	ret = bq2515x_set_const_charge_current(bq2515x,
982 						bq2515x->init_data.ichg);
983 	if (ret)
984 		return ret;
985 
986 	ret = bq2515x_set_batt_reg(bq2515x, bq2515x->init_data.vbatreg);
987 	if (ret)
988 		return ret;
989 
990 	return bq2515x_set_precharge_current(bq2515x,
991 						bq2515x->init_data.iprechg);
992 }
993 
994 static int bq2515x_read_properties(struct bq2515x_device *bq2515x)
995 {
996 	int ret;
997 
998 	ret = device_property_read_u32(bq2515x->dev,
999 				      "input-current-limit-microamp",
1000 				      &bq2515x->init_data.ilim);
1001 	if (ret) {
1002 		switch (bq2515x->device_id) {
1003 		case BQ25150:
1004 			bq2515x->init_data.ilim = BQ25150_DEFAULT_ILIM_UA;
1005 			break;
1006 		case BQ25155:
1007 			bq2515x->init_data.ilim = BQ25155_DEFAULT_ILIM_UA;
1008 			break;
1009 		}
1010 	}
1011 
1012 	bq2515x->ac_detect_gpio = devm_gpiod_get_optional(bq2515x->dev,
1013 						   "ac-detect", GPIOD_IN);
1014 	if (IS_ERR(bq2515x->ac_detect_gpio)) {
1015 		ret = PTR_ERR(bq2515x->ac_detect_gpio);
1016 		dev_err(bq2515x->dev, "Failed to get ac detect");
1017 		return ret;
1018 	}
1019 
1020 	bq2515x->reset_gpio = devm_gpiod_get_optional(bq2515x->dev,
1021 						   "reset", GPIOD_OUT_LOW);
1022 	if (IS_ERR(bq2515x->reset_gpio)) {
1023 		ret = PTR_ERR(bq2515x->reset_gpio);
1024 		dev_err(bq2515x->dev, "Failed to get reset");
1025 		return ret;
1026 	}
1027 
1028 	bq2515x->powerdown_gpio = devm_gpiod_get_optional(bq2515x->dev,
1029 						"powerdown", GPIOD_OUT_LOW);
1030 	if (IS_ERR(bq2515x->powerdown_gpio)) {
1031 		ret = PTR_ERR(bq2515x->powerdown_gpio);
1032 		dev_err(bq2515x->dev, "Failed to get powerdown");
1033 		return ret;
1034 	}
1035 
1036 	bq2515x->ce_gpio = devm_gpiod_get_optional(bq2515x->dev,
1037 						   "charge-enable",
1038 						   GPIOD_OUT_LOW);
1039 	if (IS_ERR(bq2515x->ce_gpio)) {
1040 		ret = PTR_ERR(bq2515x->ce_gpio);
1041 		dev_err(bq2515x->dev, "Failed to get ce");
1042 		return ret;
1043 	}
1044 
1045 	return 0;
1046 }
1047 
1048 static bool bq2515x_volatile_register(struct device *dev, unsigned int reg)
1049 {
1050 	switch (reg) {
1051 	case BQ2515X_STAT0 ... BQ2515X_FLAG3:
1052 	case BQ2515X_ADC_VBAT_M ... BQ2515X_ADC_IIN_L:
1053 		return true;
1054 	default:
1055 		return false;
1056 	}
1057 }
1058 
1059 static const struct regmap_config bq25150_regmap_config = {
1060 	.reg_bits = 8,
1061 	.val_bits = 8,
1062 
1063 	.max_register		= BQ2515X_DEVICE_ID,
1064 	.reg_defaults		= bq25150_reg_defaults,
1065 	.num_reg_defaults	= ARRAY_SIZE(bq25150_reg_defaults),
1066 	.cache_type		= REGCACHE_RBTREE,
1067 	.volatile_reg		= bq2515x_volatile_register,
1068 };
1069 
1070 static const struct regmap_config bq25155_regmap_config = {
1071 	.reg_bits = 8,
1072 	.val_bits = 8,
1073 
1074 	.max_register		= BQ2515X_DEVICE_ID,
1075 	.reg_defaults		= bq25155_reg_defaults,
1076 	.num_reg_defaults	= ARRAY_SIZE(bq25155_reg_defaults),
1077 	.cache_type		= REGCACHE_RBTREE,
1078 	.volatile_reg		= bq2515x_volatile_register,
1079 };
1080 
1081 static int bq2515x_probe(struct i2c_client *client,
1082 			 const struct i2c_device_id *id)
1083 {
1084 	struct device *dev = &client->dev;
1085 	struct bq2515x_device *bq2515x;
1086 	struct power_supply_config charger_cfg = {};
1087 	int ret;
1088 
1089 	bq2515x = devm_kzalloc(dev, sizeof(*bq2515x), GFP_KERNEL);
1090 	if (!bq2515x)
1091 		return -ENOMEM;
1092 
1093 	bq2515x->dev = dev;
1094 
1095 	strncpy(bq2515x->model_name, id->name, I2C_NAME_SIZE);
1096 
1097 	bq2515x->device_id = id->driver_data;
1098 
1099 	switch (bq2515x->device_id) {
1100 	case BQ25150:
1101 		bq2515x->regmap = devm_regmap_init_i2c(client,
1102 						&bq25150_regmap_config);
1103 		break;
1104 	case BQ25155:
1105 		bq2515x->regmap = devm_regmap_init_i2c(client,
1106 						&bq25155_regmap_config);
1107 		break;
1108 	}
1109 
1110 	if (IS_ERR(bq2515x->regmap)) {
1111 		dev_err(dev, "failed to allocate register map\n");
1112 		return PTR_ERR(bq2515x->regmap);
1113 	}
1114 
1115 	i2c_set_clientdata(client, bq2515x);
1116 
1117 	charger_cfg.drv_data = bq2515x;
1118 	charger_cfg.of_node = dev->of_node;
1119 
1120 	ret = bq2515x_read_properties(bq2515x);
1121 	if (ret) {
1122 		dev_err(dev, "Failed to read device tree properties %d\n",
1123 									ret);
1124 		return ret;
1125 	}
1126 
1127 	ret = bq2515x_power_supply_register(bq2515x, dev, charger_cfg);
1128 	if (ret) {
1129 		dev_err(dev, "failed to register power supply\n");
1130 		return ret;
1131 	}
1132 
1133 	ret = bq2515x_hw_init(bq2515x);
1134 	if (ret) {
1135 		dev_err(dev, "Cannot initialize the chip\n");
1136 		return ret;
1137 	}
1138 
1139 	return 0;
1140 }
1141 
1142 static const struct i2c_device_id bq2515x_i2c_ids[] = {
1143 	{ "bq25150", BQ25150, },
1144 	{ "bq25155", BQ25155, },
1145 	{},
1146 };
1147 MODULE_DEVICE_TABLE(i2c, bq2515x_i2c_ids);
1148 
1149 static const struct of_device_id bq2515x_of_match[] = {
1150 	{ .compatible = "ti,bq25150", },
1151 	{ .compatible = "ti,bq25155", },
1152 	{ },
1153 };
1154 MODULE_DEVICE_TABLE(of, bq2515x_of_match);
1155 
1156 static struct i2c_driver bq2515x_driver = {
1157 	.driver = {
1158 		.name = "bq2515x-charger",
1159 		.of_match_table = bq2515x_of_match,
1160 	},
1161 	.probe = bq2515x_probe,
1162 	.id_table = bq2515x_i2c_ids,
1163 };
1164 module_i2c_driver(bq2515x_driver);
1165 
1166 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
1167 MODULE_AUTHOR("Ricardo Rivera-Matos <r-rivera-matos@ti.com>");
1168 MODULE_DESCRIPTION("BQ2515X charger driver");
1169 MODULE_LICENSE("GPL v2");
1170