bq2515x_charger.c

   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
 132static 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 */
 143struct bq2515x_init_data {
 144	int ilim;
 145	int ichg;
 146	int vbatreg;
 147	int iprechg;
 148};
 149
 150/**
 151 * struct bq2515x_info -
 152 * @regmap_config: register map config
 153 * @ilim: input current limit
 154 */
 155struct bq2515x_info {
 156	const struct regmap_config *regmap_config;
 157	int ilim;
 158};
 159
 160/**
 161 * struct bq2515x_device -
 162 * @mains: mains properties
 163 * @battery: battery properties
 164 * @regmap: register map structure
 165 * @dev: device structure
 166 *
 167 * @reset_gpio: manual reset (MR) pin
 168 * @powerdown_gpio: low power mode pin
 169 * @ac_detect_gpio: power good (PG) pin
 170 * @ce_gpio: charge enable (CE) pin
 171 *
 172 * @info: device info
 173 * @model_name: string value describing device model
 174 * @mains_online: boolean value indicating power supply online
 175 *
 176 * @init_data: charger initialization data structure
 177 */
 178struct bq2515x_device {
 179	struct power_supply *mains;
 180	struct power_supply *battery;
 181	struct regmap *regmap;
 182	struct device *dev;
 183
 184	struct gpio_desc *reset_gpio;
 185	struct gpio_desc *powerdown_gpio;
 186	struct gpio_desc *ac_detect_gpio;
 187	struct gpio_desc *ce_gpio;
 188
 189	const struct bq2515x_info *info;
 190	char model_name[I2C_NAME_SIZE];
 191	bool mains_online;
 192
 193	struct bq2515x_init_data init_data;
 194};
 195
 196static const struct reg_default bq25150_reg_defaults[] = {
 197	{BQ2515X_FLAG0, 0x0},
 198	{BQ2515X_FLAG1, 0x0},
 199	{BQ2515X_FLAG2, 0x0},
 200	{BQ2515X_FLAG3, 0x0},
 201	{BQ2515X_MASK0, 0x0},
 202	{BQ2515X_MASK1, 0x0},
 203	{BQ2515X_MASK2, 0x71},
 204	{BQ2515X_MASK3, 0x0},
 205	{BQ2515X_VBAT_CTRL, 0x3C},
 206	{BQ2515X_ICHG_CTRL, 0x8},
 207	{BQ2515X_PCHRGCTRL, 0x2},
 208	{BQ2515X_TERMCTRL, 0x14},
 209	{BQ2515X_BUVLO, 0x0},
 210	{BQ2515X_CHARGERCTRL0, 0x82},
 211	{BQ2515X_CHARGERCTRL1, 0x42},
 212	{BQ2515X_ILIMCTRL, 0x1},
 213	{BQ2515X_LDOCTRL, 0xB0},
 214	{BQ2515X_MRCTRL, 0x2A},
 215	{BQ2515X_ICCTRL0, 0x10},
 216	{BQ2515X_ICCTRL1, 0x0},
 217	{BQ2515X_ICCTRL2, 0x0},
 218	{BQ2515X_ADCCTRL0, 0x2},
 219	{BQ2515X_ADCCTRL1, 0x40},
 220	{BQ2515X_ADC_COMP1_M, 0x23},
 221	{BQ2515X_ADC_COMP1_L, 0x20},
 222	{BQ2515X_ADC_COMP2_M, 0x38},
 223	{BQ2515X_ADC_COMP2_L, 0x90},
 224	{BQ2515X_ADC_COMP3_M, 0x0},
 225	{BQ2515X_ADC_COMP3_L, 0x0},
 226	{BQ2515X_ADC_READ_EN, 0x0},
 227	{BQ2515X_TS_FASTCHGCTRL, 0x34},
 228	{BQ2515X_TS_COLD, 0x7C},
 229	{BQ2515X_TS_COOL, 0x6D},
 230	{BQ2515X_TS_WARM, 0x38},
 231	{BQ2515X_TS_HOT, 0x27},
 232	{BQ2515X_DEVICE_ID, 0x20},
 233};
 234
 235static const struct reg_default bq25155_reg_defaults[] = {
 236	{BQ2515X_FLAG0, 0x0},
 237	{BQ2515X_FLAG1, 0x0},
 238	{BQ2515X_FLAG2, 0x0},
 239	{BQ2515X_FLAG3, 0x0},
 240	{BQ2515X_MASK0, 0x0},
 241	{BQ2515X_MASK1, 0x0},
 242	{BQ2515X_MASK2, 0x71},
 243	{BQ2515X_MASK3, 0x0},
 244	{BQ2515X_VBAT_CTRL, 0x3C},
 245	{BQ2515X_ICHG_CTRL, 0x8},
 246	{BQ2515X_PCHRGCTRL, 0x2},
 247	{BQ2515X_TERMCTRL, 0x14},
 248	{BQ2515X_BUVLO, 0x0},
 249	{BQ2515X_CHARGERCTRL0, 0x82},
 250	{BQ2515X_CHARGERCTRL1, 0xC2},
 251	{BQ2515X_ILIMCTRL, 0x6},
 252	{BQ2515X_LDOCTRL, 0xB0},
 253	{BQ2515X_MRCTRL, 0x2A},
 254	{BQ2515X_ICCTRL0, 0x10},
 255	{BQ2515X_ICCTRL1, 0x0},
 256	{BQ2515X_ICCTRL2, 0x40},
 257	{BQ2515X_ADCCTRL0, 0x2},
 258	{BQ2515X_ADCCTRL1, 0x40},
 259	{BQ2515X_ADC_COMP1_M, 0x23},
 260	{BQ2515X_ADC_COMP1_L, 0x20},
 261	{BQ2515X_ADC_COMP2_M, 0x38},
 262	{BQ2515X_ADC_COMP2_L, 0x90},
 263	{BQ2515X_ADC_COMP3_M, 0x0},
 264	{BQ2515X_ADC_COMP3_L, 0x0},
 265	{BQ2515X_ADC_READ_EN, 0x0},
 266	{BQ2515X_TS_FASTCHGCTRL, 0x34},
 267	{BQ2515X_TS_COLD, 0x7C},
 268	{BQ2515X_TS_COOL, 0x6D},
 269	{BQ2515X_TS_WARM, 0x38},
 270	{BQ2515X_TS_HOT, 0x27},
 271	{BQ2515X_DEVICE_ID, 0x35},
 272};
 273
 274static int bq2515x_wake_up(struct bq2515x_device *bq2515x)
 275{
 276	int ret;
 277	int val;
 278
 279	/* Read the STAT register if we can read it then the device is out
 280	 * of ship mode.  If the register cannot be read then attempt to wake
 281	 * it up and enable the ADC.
 282	 */
 283	ret = regmap_read(bq2515x->regmap, BQ2515X_STAT0, &val);
 284	if (ret)
 285		return ret;
 286
 287	/* Need to toggle LP and bring device out of ship mode. The device
 288	 * will exit the ship mode when the MR pin is held low for at least
 289	 * t_WAKE2 as shown in section 8.3.7.1 of the datasheet.
 290	 */
 291	gpiod_set_value_cansleep(bq2515x->powerdown_gpio, 0);
 292
 293	gpiod_set_value_cansleep(bq2515x->reset_gpio, 0);
 294	usleep_range(BQ2515X_TWAKE2_MIN_US, BQ2515X_TWAKE2_MAX_US);
 295	gpiod_set_value_cansleep(bq2515x->reset_gpio, 1);
 296
 297	return regmap_write(bq2515x->regmap, BQ2515X_ADC_READ_EN,
 298				(BQ2515X_EN_VBAT_READ | BQ2515X_EN_ICHG_READ));
 299}
 300
 301static int bq2515x_update_ps_status(struct bq2515x_device *bq2515x)
 302{
 303	bool dc = false;
 304	unsigned int val;
 305	int ret;
 306
 307	if (bq2515x->ac_detect_gpio)
 308		val = gpiod_get_value_cansleep(bq2515x->ac_detect_gpio);
 309	else {
 310		ret = regmap_read(bq2515x->regmap, BQ2515X_STAT0, &val);
 311		if (ret)
 312			return ret;
 313	}
 314
 315	dc = val & BQ2515X_VIN_GOOD;
 316
 317	ret = bq2515x->mains_online != dc;
 318
 319	bq2515x->mains_online = dc;
 320
 321	return ret;
 322}
 323
 324static int bq2515x_disable_watchdog_timers(struct bq2515x_device *bq2515x)
 325{
 326	int ret;
 327
 328	ret = regmap_update_bits(bq2515x->regmap, BQ2515X_CHARGERCTRL0,
 329			BQ2515X_WATCHDOG_DISABLE, BQ2515X_WATCHDOG_DISABLE);
 330	if (ret)
 331		return ret;
 332
 333	return regmap_update_bits(bq2515x->regmap, BQ2515X_ICCTRL2,
 334						BQ2515X_HWRESET_14S_WD, 0);
 335}
 336
 337static int bq2515x_get_battery_voltage_now(struct bq2515x_device *bq2515x)
 338{
 339	int ret;
 340	int vbat_msb;
 341	int vbat_lsb;
 342	uint32_t vbat_measurement;
 343
 344	if (!bq2515x->mains_online)
 345		bq2515x_wake_up(bq2515x);
 346
 347	ret = regmap_read(bq2515x->regmap, BQ2515X_ADC_VBAT_M, &vbat_msb);
 348	if (ret)
 349		return ret;
 350
 351	ret = regmap_read(bq2515x->regmap, BQ2515X_ADC_VBAT_L, &vbat_lsb);
 352	if (ret)
 353		return ret;
 354
 355	vbat_measurement = (vbat_msb << 8) | vbat_lsb;
 356
 357	return vbat_measurement * (BQ2515X_UV_FACTOR / BQ2515X_DIVISOR) *
 358						BQ2515X_VBAT_MULTIPLIER;
 359}
 360
 361static int bq2515x_get_battery_current_now(struct bq2515x_device *bq2515x)
 362{
 363	int ret;
 364	int ichg_msb;
 365	int ichg_lsb;
 366	uint32_t ichg_measurement;
 367	u16 ichg_multiplier = BQ2515X_ICHG_RNG_1B0_UA;
 368	unsigned int ichg_reg_code, reg_code;
 369	unsigned int icharge_range = 0, pchrgctrl;
 370	unsigned int buvlo, vlowv_sel, vlowv = BQ2515X_VLOWV_SEL_1B0_UV;
 371
 372	if (!bq2515x->mains_online)
 373		return -ENODATA;
 374
 375	ret = regmap_read(bq2515x->regmap, BQ2515X_ADC_ICHG_M, &ichg_msb);
 376	if (ret)
 377		return ret;
 378
 379	ret = regmap_read(bq2515x->regmap, BQ2515X_ADC_ICHG_L, &ichg_lsb);
 380	if (ret)
 381		return ret;
 382
 383	ichg_measurement = (ichg_msb << 8) | ichg_lsb;
 384
 385	ret = regmap_read(bq2515x->regmap, BQ2515X_BUVLO, &buvlo);
 386	if (ret)
 387		return ret;
 388
 389	vlowv_sel = buvlo & BQ2515X_VLOWV_SEL;
 390
 391	if (vlowv_sel)
 392		vlowv = BQ2515X_VLOWV_SEL_1B1_UV;
 393
 394	if (bq2515x_get_battery_voltage_now(bq2515x) < vlowv) {
 395		ret = regmap_read(bq2515x->regmap, BQ2515X_PCHRGCTRL,
 396								&pchrgctrl);
 397		if (ret)
 398			return ret;
 399
 400		reg_code = pchrgctrl & BQ2515X_PRECHARGE_MASK;
 401	} else {
 402		ret = regmap_read(bq2515x->regmap, BQ2515X_ICHG_CTRL,
 403							&ichg_reg_code);
 404		if (ret)
 405			return ret;
 406
 407		reg_code = ichg_reg_code;
 408	}
 409
 410	ret = regmap_read(bq2515x->regmap, BQ2515X_PCHRGCTRL, &pchrgctrl);
 411	if (ret)
 412		return ret;
 413
 414	icharge_range = pchrgctrl & BQ2515X_ICHARGE_RANGE;
 415
 416	if (icharge_range)
 417		ichg_multiplier = BQ2515X_ICHG_RNG_1B1_UA;
 418
 419	return reg_code * (ichg_multiplier * ichg_measurement /
 420							BQ2515X_ICHG_DIVISOR);
 421}
 422
 423static bool bq2515x_get_charge_disable(struct bq2515x_device *bq2515x)
 424{
 425	int ret;
 426	int ce_pin;
 427	int icctrl2;
 428	int charger_disable;
 429
 430	ce_pin = gpiod_get_value_cansleep(bq2515x->ce_gpio);
 431
 432	ret = regmap_read(bq2515x->regmap, BQ2515X_ICCTRL2, &icctrl2);
 433	if (ret)
 434		return ret;
 435
 436	charger_disable = icctrl2 & BQ2515X_CHARGER_DISABLE;
 437
 438	if (charger_disable || ce_pin)
 439		return true;
 440
 441	return false;
 442}
 443
 444static int bq2515x_set_charge_disable(struct bq2515x_device *bq2515x, int val)
 445{
 446	gpiod_set_value_cansleep(bq2515x->ce_gpio, val);
 447
 448	return regmap_update_bits(bq2515x->regmap, BQ2515X_ICCTRL2,
 449					BQ2515X_CHARGER_DISABLE, val);
 450}
 451
 452static int bq2515x_get_const_charge_current(struct bq2515x_device *bq2515x)
 453{
 454	int ret;
 455	u16 ichg_multiplier = BQ2515X_ICHG_RNG_1B0_UA;
 456	unsigned int ichg_reg_code;
 457	unsigned int pchrgctrl;
 458	unsigned int icharge_range;
 459
 460	ret = regmap_read(bq2515x->regmap, BQ2515X_ICHG_CTRL, &ichg_reg_code);
 461	if (ret)
 462		return ret;
 463
 464	ret = regmap_read(bq2515x->regmap, BQ2515X_PCHRGCTRL, &pchrgctrl);
 465	if (ret)
 466		return ret;
 467
 468	icharge_range = pchrgctrl & BQ2515X_ICHARGE_RANGE;
 469
 470	if (icharge_range)
 471		ichg_multiplier = BQ2515X_ICHG_RNG_1B1_UA;
 472
 473	return ichg_reg_code * ichg_multiplier;
 474}
 475
 476static int bq2515x_set_const_charge_current(struct bq2515x_device *bq2515x,
 477								int val)
 478{
 479	int ret;
 480	unsigned int ichg_reg_code;
 481	u16 ichg_multiplier = BQ2515X_ICHG_RNG_1B0_UA;
 482	unsigned int icharge_range = 0;
 483
 484	if (val > BQ2515X_ICHG_MAX_UA || val < BQ2515X_ICHG_MIN_UA)
 485		return -EINVAL;
 486
 487	if (val > BQ2515X_ICHG_CURR_STEP_THRESH_UA) {
 488		ichg_multiplier = BQ2515X_ICHG_RNG_1B1_UA;
 489		icharge_range = BQ2515X_ICHARGE_RANGE;
 490	}
 491
 492	bq2515x_set_charge_disable(bq2515x, 1);
 493
 494	ret = regmap_update_bits(bq2515x->regmap, BQ2515X_PCHRGCTRL,
 495					BQ2515X_ICHARGE_RANGE, icharge_range);
 496	if (ret)
 497		return ret;
 498
 499	ichg_reg_code = val / ichg_multiplier;
 500
 501	ret = regmap_write(bq2515x->regmap, BQ2515X_ICHG_CTRL, ichg_reg_code);
 502	if (ret)
 503		return ret;
 504
 505	return bq2515x_set_charge_disable(bq2515x, 0);
 506}
 507
 508static int bq2515x_get_precharge_current(struct bq2515x_device *bq2515x)
 509{
 510	int ret;
 511	unsigned int pchrgctrl;
 512	unsigned int icharge_range;
 513	u16 precharge_multiplier = BQ2515X_ICHG_RNG_1B0_UA;
 514	unsigned int precharge_reg_code;
 515
 516	ret = regmap_read(bq2515x->regmap, BQ2515X_PCHRGCTRL, &pchrgctrl);
 517	if (ret)
 518		return ret;
 519
 520	icharge_range = pchrgctrl & BQ2515X_ICHARGE_RANGE;
 521
 522	if (icharge_range)
 523		precharge_multiplier = BQ2515X_ICHG_RNG_1B1_UA;
 524
 525	precharge_reg_code = pchrgctrl & BQ2515X_PRECHARGE_MASK;
 526
 527	return precharge_reg_code * precharge_multiplier;
 528}
 529
 530static int bq2515x_set_precharge_current(struct bq2515x_device *bq2515x,
 531					int val)
 532{
 533	int ret;
 534	unsigned int pchrgctrl;
 535	unsigned int icharge_range;
 536	unsigned int precharge_reg_code;
 537	unsigned int precharge_multiplier = BQ2515X_ICHG_RNG_1B0_UA;
 538	unsigned int precharge_max_ua = BQ2515X_PRECHRG_ICHRG_RNGE_1875_UA;
 539
 540	ret = regmap_read(bq2515x->regmap, BQ2515X_PCHRGCTRL, &pchrgctrl);
 541	if (ret)
 542		return ret;
 543
 544	icharge_range = pchrgctrl & BQ2515X_ICHARGE_RANGE;
 545
 546	if (icharge_range) {
 547		precharge_max_ua = BQ2515X_PRECHRG_ICHRG_RNGE_3750_UA;
 548		precharge_multiplier = BQ2515X_ICHG_RNG_1B1_UA;
 549	} else {
 550		precharge_max_ua = BQ2515X_PRECHRG_ICHRG_RNGE_1875_UA;
 551		precharge_multiplier = BQ2515X_ICHG_RNG_1B0_UA;
 552	}
 553	if (val > precharge_max_ua || val < BQ2515X_ICHG_MIN_UA)
 554		return -EINVAL;
 555
 556	precharge_reg_code = val / precharge_multiplier;
 557
 558	ret = bq2515x_set_charge_disable(bq2515x, 1);
 559	if (ret)
 560		return ret;
 561
 562	ret = regmap_update_bits(bq2515x->regmap, BQ2515X_PCHRGCTRL,
 563				BQ2515X_PRECHARGE_MASK, precharge_reg_code);
 564	if (ret)
 565		return ret;
 566
 567	return bq2515x_set_charge_disable(bq2515x, 0);
 568}
 569
 570static int bq2515x_charging_status(struct bq2515x_device *bq2515x,
 571				   union power_supply_propval *val)
 572{
 573	bool status0_no_fault;
 574	bool status1_no_fault;
 575	bool ce_status;
 576	bool charge_done;
 577	unsigned int status;
 578	int ret;
 579
 580	if (!bq2515x->mains_online) {
 581		val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 582		return 0;
 583	}
 584
 585	ret = regmap_read(bq2515x->regmap, BQ2515X_STAT0, &status);
 586	if (ret)
 587		return ret;
 588
 589	/*
 590	 * The code block below is used to determine if any faults from the
 591	 * STAT0 register are disbaling charging or if the charge has completed
 592	 * according to the CHARGE_DONE_STAT bit.
 593	 */
 594	if (((status & BQ2515X_STAT0_MASK) == true) &
 595			((status & BQ2515X_CHRG_DONE) == false)) {
 596		status0_no_fault = true;
 597		charge_done = false;
 598	} else if (status & BQ2515X_CHRG_DONE) {
 599		charge_done = true;
 600		status0_no_fault = false;
 601	} else {
 602		status0_no_fault = false;
 603		charge_done = false;
 604	}
 605
 606	ret = regmap_read(bq2515x->regmap, BQ2515X_STAT1, &status);
 607	if (ret)
 608		return ret;
 609	/*
 610	 * The code block below is used to determine if any faults from the
 611	 * STAT1 register are disbaling charging
 612	 */
 613	if ((status & BQ2515X_STAT1_MASK) == false)
 614		status1_no_fault = true;
 615	else
 616		status1_no_fault = false;
 617
 618	ce_status = (!bq2515x_get_charge_disable(bq2515x));
 619
 620	/*
 621	 * If there are no faults and charging is enabled, then status is
 622	 * charging. Otherwise, if charging is complete, then status is full.
 623	 * Otherwise, if a fault exists or charging is disabled, then status is
 624	 * not charging
 625	 */
 626	if (status0_no_fault & status1_no_fault & ce_status)
 627		val->intval = POWER_SUPPLY_STATUS_CHARGING;
 628	else if (charge_done)
 629		val->intval = POWER_SUPPLY_STATUS_FULL;
 630	else if (!(status0_no_fault & status1_no_fault & ce_status))
 631		val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 632
 633	return 0;
 634}
 635
 636static int bq2515x_get_batt_reg(struct bq2515x_device *bq2515x)
 637{
 638	int vbat_reg_code;
 639	int ret;
 640
 641	ret = regmap_read(bq2515x->regmap, BQ2515X_VBAT_CTRL, &vbat_reg_code);
 642	if (ret)
 643		return ret;
 644
 645	return BQ2515X_VBAT_BASE_VOLT + vbat_reg_code * BQ2515X_VBAT_STEP_UV;
 646}
 647
 648static int bq2515x_set_batt_reg(struct bq2515x_device *bq2515x, int val)
 649{
 650	int vbat_reg_code;
 651
 652	if (val > BQ2515X_VBAT_REG_MAX || val < BQ2515X_VBAT_REG_MIN)
 653		return -EINVAL;
 654
 655	vbat_reg_code = (val - BQ2515X_VBAT_BASE_VOLT) / BQ2515X_VBAT_STEP_UV;
 656
 657	return regmap_write(bq2515x->regmap, BQ2515X_VBAT_CTRL, vbat_reg_code);
 658}
 659
 660static int bq2515x_get_ilim_lvl(struct bq2515x_device *bq2515x)
 661{
 662	int ret;
 663	int ilimctrl;
 664
 665	ret = regmap_read(bq2515x->regmap, BQ2515X_ILIMCTRL, &ilimctrl);
 666	if (ret)
 667		return ret;
 668
 669	return bq2515x_ilim_lvl_values[ilimctrl & BQ2515X_ILIM_MASK];
 670}
 671
 672static int bq2515x_set_ilim_lvl(struct bq2515x_device *bq2515x, int val)
 673{
 674	int i = 0;
 675	unsigned int array_size = ARRAY_SIZE(bq2515x_ilim_lvl_values);
 676
 677	for (i = array_size - 1; i > 0; i--) {
 678		if (val >= bq2515x_ilim_lvl_values[i])
 679			break;
 680	}
 681	return regmap_write(bq2515x->regmap, BQ2515X_ILIMCTRL, i);
 682}
 683
 684static int bq2515x_power_supply_property_is_writeable(struct power_supply *psy,
 685					enum power_supply_property prop)
 686{
 687	switch (prop) {
 688	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 689	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 690	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 691	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
 692		return true;
 693	default:
 694		return false;
 695	}
 696}
 697
 698static int bq2515x_charger_get_health(struct bq2515x_device *bq2515x,
 699				      union power_supply_propval *val)
 700{
 701	int health = POWER_SUPPLY_HEALTH_GOOD;
 702	int ret;
 703	unsigned int stat1;
 704	unsigned int flag3;
 705
 706	if (!bq2515x->mains_online)
 707		bq2515x_wake_up(bq2515x);
 708
 709	ret = regmap_read(bq2515x->regmap, BQ2515X_FLAG3, &flag3);
 710	if (ret)
 711		return ret;
 712
 713	ret = regmap_read(bq2515x->regmap, BQ2515X_STAT1, &stat1);
 714	if (ret)
 715		return ret;
 716
 717	if (stat1 & BQ2515X_HEALTH_MASK) {
 718		switch (stat1 & BQ2515X_HEALTH_MASK) {
 719		case BQ2515X_TS_HOT_STAT:
 720			health = POWER_SUPPLY_HEALTH_HOT;
 721			break;
 722		case BQ2515X_TS_WARM_STAT:
 723			health = POWER_SUPPLY_HEALTH_WARM;
 724			break;
 725		case BQ2515X_TS_COOL_STAT:
 726			health = POWER_SUPPLY_HEALTH_COOL;
 727			break;
 728		case BQ2515X_TS_COLD_STAT:
 729			health = POWER_SUPPLY_HEALTH_COLD;
 730			break;
 731		default:
 732			health = POWER_SUPPLY_HEALTH_UNKNOWN;
 733			break;
 734		}
 735	}
 736
 737	if (stat1 & BQ2515X_VIN_OVP_FAULT_STAT)
 738		health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 739
 740	if (flag3 & BQ2515X_SAFETY_TIMER_EXP)
 741		health = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
 742
 743	val->intval = health;
 744	return 0;
 745}
 746
 747static int bq2515x_mains_set_property(struct power_supply *psy,
 748		enum power_supply_property prop,
 749		const union power_supply_propval *val)
 750{
 751	struct bq2515x_device *bq2515x = power_supply_get_drvdata(psy);
 752	int ret;
 753
 754	switch (prop) {
 755	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 756		ret = bq2515x_set_batt_reg(bq2515x, val->intval);
 757		break;
 758
 759	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 760		ret = bq2515x_set_const_charge_current(bq2515x, val->intval);
 761		break;
 762
 763	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 764		ret = bq2515x_set_ilim_lvl(bq2515x, val->intval);
 765		break;
 766
 767	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
 768		ret = bq2515x_set_precharge_current(bq2515x, val->intval);
 769		break;
 770
 771	default:
 772		return -EINVAL;
 773	}
 774
 775	return ret;
 776}
 777
 778static int bq2515x_mains_get_property(struct power_supply *psy,
 779				     enum power_supply_property prop,
 780				     union power_supply_propval *val)
 781{
 782	struct bq2515x_device *bq2515x = power_supply_get_drvdata(psy);
 783	int ret = 0;
 784
 785	switch (prop) {
 786
 787	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 788		ret = bq2515x_get_const_charge_current(bq2515x);
 789		if (ret < 0)
 790			return ret;
 791
 792		val->intval = ret;
 793		break;
 794
 795	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 796		ret = bq2515x_get_batt_reg(bq2515x);
 797		if (ret < 0)
 798			return ret;
 799		val->intval = ret;
 800		break;
 801
 802	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
 803		ret = bq2515x_get_precharge_current(bq2515x);
 804		if (ret < 0)
 805			return ret;
 806		val->intval = ret;
 807		break;
 808
 809	case POWER_SUPPLY_PROP_ONLINE:
 810		val->intval = bq2515x->mains_online;
 811		break;
 812
 813	case POWER_SUPPLY_PROP_HEALTH:
 814		ret = bq2515x_charger_get_health(bq2515x, val);
 815		if (ret)
 816			val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
 817		break;
 818
 819	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 820		ret = bq2515x_get_ilim_lvl(bq2515x);
 821		if (ret < 0)
 822			return ret;
 823		val->intval = ret;
 824		break;
 825
 826	case POWER_SUPPLY_PROP_MODEL_NAME:
 827		val->strval = bq2515x->model_name;
 828		break;
 829
 830	case POWER_SUPPLY_PROP_MANUFACTURER:
 831		val->strval = BQ2515X_MANUFACTURER;
 832		break;
 833
 834	case POWER_SUPPLY_PROP_STATUS:
 835		ret = bq2515x_charging_status(bq2515x, val);
 836		if (ret)
 837			return ret;
 838		break;
 839
 840	default:
 841		return -EINVAL;
 842	}
 843
 844	return ret;
 845}
 846
 847static int bq2515x_battery_get_property(struct power_supply *psy,
 848				       enum power_supply_property prop,
 849				       union power_supply_propval *val)
 850{
 851	struct bq2515x_device *bq2515x = power_supply_get_drvdata(psy);
 852	int ret;
 853
 854	ret = bq2515x_update_ps_status(bq2515x);
 855	if (ret)
 856		return ret;
 857
 858	switch (prop) {
 859
 860	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 861		ret = bq2515x->init_data.vbatreg;
 862		if (ret < 0)
 863			return ret;
 864		val->intval = ret;
 865		break;
 866
 867	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 868		ret = bq2515x->init_data.ichg;
 869		if (ret < 0)
 870			return ret;
 871		val->intval = ret;
 872		break;
 873
 874	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 875		ret = bq2515x_get_battery_voltage_now(bq2515x);
 876		if (ret < 0)
 877			return ret;
 878		val->intval = ret;
 879		break;
 880
 881	case POWER_SUPPLY_PROP_CURRENT_NOW:
 882		ret = bq2515x_get_battery_current_now(bq2515x);
 883		if (ret < 0)
 884			return ret;
 885		val->intval = ret;
 886		break;
 887
 888	default:
 889		return -EINVAL;
 890	}
 891	return 0;
 892}
 893
 894static const enum power_supply_property bq2515x_battery_properties[] = {
 895	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 896	POWER_SUPPLY_PROP_CURRENT_NOW,
 897	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
 898	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 899};
 900
 901static const enum power_supply_property bq2515x_mains_properties[] = {
 902	POWER_SUPPLY_PROP_ONLINE,
 903	POWER_SUPPLY_PROP_STATUS,
 904	POWER_SUPPLY_PROP_HEALTH,
 905	POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
 906	POWER_SUPPLY_PROP_MODEL_NAME,
 907	POWER_SUPPLY_PROP_MANUFACTURER,
 908	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 909	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
 910	POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
 911};
 912
 913static const struct power_supply_desc bq2515x_mains_desc = {
 914	.name			= "bq2515x-mains",
 915	.type			= POWER_SUPPLY_TYPE_MAINS,
 916	.get_property		= bq2515x_mains_get_property,
 917	.set_property		= bq2515x_mains_set_property,
 918	.properties		= bq2515x_mains_properties,
 919	.num_properties		= ARRAY_SIZE(bq2515x_mains_properties),
 920	.property_is_writeable	= bq2515x_power_supply_property_is_writeable,
 921};
 922
 923static const struct power_supply_desc bq2515x_battery_desc = {
 924	.name			= "bq2515x-battery",
 925	.type			= POWER_SUPPLY_TYPE_BATTERY,
 926	.get_property		= bq2515x_battery_get_property,
 927	.properties		= bq2515x_battery_properties,
 928	.num_properties		= ARRAY_SIZE(bq2515x_battery_properties),
 929	.property_is_writeable	= bq2515x_power_supply_property_is_writeable,
 930};
 931
 932static int bq2515x_power_supply_register(struct bq2515x_device *bq2515x,
 933		struct device *dev, struct power_supply_config psy_cfg)
 934{
 935	bq2515x->mains = devm_power_supply_register(bq2515x->dev,
 936						    &bq2515x_mains_desc,
 937						    &psy_cfg);
 938	if (IS_ERR(bq2515x->mains))
 939		return -EINVAL;
 940
 941	bq2515x->battery = devm_power_supply_register(bq2515x->dev,
 942						      &bq2515x_battery_desc,
 943						      &psy_cfg);
 944	if (IS_ERR(bq2515x->battery))
 945		return -EINVAL;
 946
 947	return 0;
 948}
 949
 950static int bq2515x_hw_init(struct bq2515x_device *bq2515x)
 951{
 952	int ret;
 953	struct power_supply_battery_info *bat_info;
 954
 955	ret = bq2515x_disable_watchdog_timers(bq2515x);
 956	if (ret)
 957		return ret;
 958
 959	if (bq2515x->init_data.ilim) {
 960		ret = bq2515x_set_ilim_lvl(bq2515x, bq2515x->init_data.ilim);
 961		if (ret)
 962			return ret;
 963	}
 964
 965	ret = power_supply_get_battery_info(bq2515x->mains, &bat_info);
 966	if (ret) {
 967		dev_warn(bq2515x->dev, "battery info missing, default values will be applied\n");
 968
 969		bq2515x->init_data.ichg = BQ2515X_DEFAULT_ICHG_UA;
 970
 971		bq2515x->init_data.vbatreg = BQ2515X_DEFAULT_VBAT_REG_UV;
 972
 973		bq2515x->init_data.iprechg = BQ2515X_DEFAULT_IPRECHARGE_UA;
 974
 975	} else {
 976		bq2515x->init_data.ichg =
 977				bat_info->constant_charge_current_max_ua;
 978
 979		bq2515x->init_data.vbatreg =
 980				bat_info->constant_charge_voltage_max_uv;
 981
 982		bq2515x->init_data.iprechg =
 983				bat_info->precharge_current_ua;
 984	}
 985
 986	ret = bq2515x_set_const_charge_current(bq2515x,
 987						bq2515x->init_data.ichg);
 988	if (ret)
 989		return ret;
 990
 991	ret = bq2515x_set_batt_reg(bq2515x, bq2515x->init_data.vbatreg);
 992	if (ret)
 993		return ret;
 994
 995	return bq2515x_set_precharge_current(bq2515x,
 996						bq2515x->init_data.iprechg);
 997}
 998
 999static int bq2515x_read_properties(struct bq2515x_device *bq2515x)
1000{
1001	int ret;
1002
1003	ret = device_property_read_u32(bq2515x->dev,
1004				      "input-current-limit-microamp",
1005				      &bq2515x->init_data.ilim);
1006	if (ret)
1007		bq2515x->init_data.ilim = bq2515x->info->ilim;
1008
1009	bq2515x->ac_detect_gpio = devm_gpiod_get_optional(bq2515x->dev,
1010						   "ac-detect", GPIOD_IN);
1011	if (IS_ERR(bq2515x->ac_detect_gpio)) {
1012		ret = PTR_ERR(bq2515x->ac_detect_gpio);
1013		dev_err(bq2515x->dev, "Failed to get ac detect");
1014		return ret;
1015	}
1016
1017	bq2515x->reset_gpio = devm_gpiod_get_optional(bq2515x->dev,
1018						   "reset", GPIOD_OUT_LOW);
1019	if (IS_ERR(bq2515x->reset_gpio)) {
1020		ret = PTR_ERR(bq2515x->reset_gpio);
1021		dev_err(bq2515x->dev, "Failed to get reset");
1022		return ret;
1023	}
1024
1025	bq2515x->powerdown_gpio = devm_gpiod_get_optional(bq2515x->dev,
1026						"powerdown", GPIOD_OUT_LOW);
1027	if (IS_ERR(bq2515x->powerdown_gpio)) {
1028		ret = PTR_ERR(bq2515x->powerdown_gpio);
1029		dev_err(bq2515x->dev, "Failed to get powerdown");
1030		return ret;
1031	}
1032
1033	bq2515x->ce_gpio = devm_gpiod_get_optional(bq2515x->dev,
1034						   "charge-enable",
1035						   GPIOD_OUT_LOW);
1036	if (IS_ERR(bq2515x->ce_gpio)) {
1037		ret = PTR_ERR(bq2515x->ce_gpio);
1038		dev_err(bq2515x->dev, "Failed to get ce");
1039		return ret;
1040	}
1041
1042	return 0;
1043}
1044
1045static bool bq2515x_volatile_register(struct device *dev, unsigned int reg)
1046{
1047	switch (reg) {
1048	case BQ2515X_STAT0 ... BQ2515X_FLAG3:
1049	case BQ2515X_ADC_VBAT_M ... BQ2515X_ADC_IIN_L:
1050		return true;
1051	default:
1052		return false;
1053	}
1054}
1055
1056static const struct regmap_config bq25150_regmap_config = {
1057	.reg_bits = 8,
1058	.val_bits = 8,
1059
1060	.max_register		= BQ2515X_DEVICE_ID,
1061	.reg_defaults		= bq25150_reg_defaults,
1062	.num_reg_defaults	= ARRAY_SIZE(bq25150_reg_defaults),
1063	.cache_type		= REGCACHE_MAPLE,
1064	.volatile_reg		= bq2515x_volatile_register,
1065};
1066
1067static const struct regmap_config bq25155_regmap_config = {
1068	.reg_bits = 8,
1069	.val_bits = 8,
1070
1071	.max_register		= BQ2515X_DEVICE_ID,
1072	.reg_defaults		= bq25155_reg_defaults,
1073	.num_reg_defaults	= ARRAY_SIZE(bq25155_reg_defaults),
1074	.cache_type		= REGCACHE_MAPLE,
1075	.volatile_reg		= bq2515x_volatile_register,
1076};
1077
1078static int bq2515x_probe(struct i2c_client *client)
1079{
1080	const struct i2c_device_id *id = i2c_client_get_device_id(client);
1081	struct device *dev = &client->dev;
1082	struct bq2515x_device *bq2515x;
1083	struct power_supply_config charger_cfg = {};
1084	int ret;
1085
1086	bq2515x = devm_kzalloc(dev, sizeof(*bq2515x), GFP_KERNEL);
1087	if (!bq2515x)
1088		return -ENOMEM;
1089
1090	bq2515x->dev = dev;
1091
1092	strscpy(bq2515x->model_name, id->name, sizeof(bq2515x->model_name));
1093
1094	bq2515x->info = i2c_get_match_data(client);
1095	bq2515x->regmap = devm_regmap_init_i2c(client,
1096					       bq2515x->info->regmap_config);
1097	if (IS_ERR(bq2515x->regmap)) {
1098		dev_err(dev, "failed to allocate register map\n");
1099		return PTR_ERR(bq2515x->regmap);
1100	}
1101
1102	i2c_set_clientdata(client, bq2515x);
1103
1104	charger_cfg.drv_data = bq2515x;
1105	charger_cfg.fwnode = dev_fwnode(dev);
1106
1107	ret = bq2515x_read_properties(bq2515x);
1108	if (ret) {
1109		dev_err(dev, "Failed to read device tree properties %d\n",
1110									ret);
1111		return ret;
1112	}
1113
1114	ret = bq2515x_power_supply_register(bq2515x, dev, charger_cfg);
1115	if (ret) {
1116		dev_err(dev, "failed to register power supply\n");
1117		return ret;
1118	}
1119
1120	ret = bq2515x_hw_init(bq2515x);
1121	if (ret) {
1122		dev_err(dev, "Cannot initialize the chip\n");
1123		return ret;
1124	}
1125
1126	return 0;
1127}
1128
1129static const struct bq2515x_info bq25150 = {
1130	.regmap_config = &bq25150_regmap_config,
1131	.ilim = BQ25150_DEFAULT_ILIM_UA,
1132};
1133
1134static const struct bq2515x_info bq25155 = {
1135	.regmap_config = &bq25155_regmap_config,
1136	.ilim = BQ25155_DEFAULT_ILIM_UA,
1137};
1138
1139static const struct i2c_device_id bq2515x_i2c_ids[] = {
1140	{ "bq25150", (kernel_ulong_t)&bq25150 },
1141	{ "bq25155", (kernel_ulong_t)&bq25155 },
1142	{}
1143};
1144MODULE_DEVICE_TABLE(i2c, bq2515x_i2c_ids);
1145
1146static const struct of_device_id bq2515x_of_match[] = {
1147	{ .compatible = "ti,bq25150", .data = &bq25150 },
1148	{ .compatible = "ti,bq25155", .data = &bq25155 },
1149	{}
1150};
1151MODULE_DEVICE_TABLE(of, bq2515x_of_match);
1152
1153static struct i2c_driver bq2515x_driver = {
1154	.driver = {
1155		.name = "bq2515x-charger",
1156		.of_match_table = bq2515x_of_match,
1157	},
1158	.probe = bq2515x_probe,
1159	.id_table = bq2515x_i2c_ids,
1160};
1161module_i2c_driver(bq2515x_driver);
1162
1163MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
1164MODULE_AUTHOR("Ricardo Rivera-Matos <r-rivera-matos@ti.com>");
1165MODULE_DESCRIPTION("BQ2515X charger driver");
1166MODULE_LICENSE("GPL v2");