sc27xx_fuel_gauge.c

   1// SPDX-License-Identifier: GPL-2.0
   2// Copyright (C) 2018 Spreadtrum Communications Inc.
   3
   4#include <linux/gpio/consumer.h>
   5#include <linux/iio/consumer.h>
   6#include <linux/interrupt.h>
   7#include <linux/kernel.h>
   8#include <linux/math64.h>
   9#include <linux/module.h>
  10#include <linux/nvmem-consumer.h>
  11#include <linux/of.h>
  12#include <linux/platform_device.h>
  13#include <linux/power_supply.h>
  14#include <linux/regmap.h>
  15#include <linux/slab.h>
  16
  17/* PMIC global control registers definition */
  18#define SC27XX_MODULE_EN0		0xc08
  19#define SC27XX_CLK_EN0			0xc18
  20#define SC27XX_FGU_EN			BIT(7)
  21#define SC27XX_FGU_RTC_EN		BIT(6)
  22
  23/* FGU registers definition */
  24#define SC27XX_FGU_START		0x0
  25#define SC27XX_FGU_CONFIG		0x4
  26#define SC27XX_FGU_ADC_CONFIG		0x8
  27#define SC27XX_FGU_STATUS		0xc
  28#define SC27XX_FGU_INT_EN		0x10
  29#define SC27XX_FGU_INT_CLR		0x14
  30#define SC27XX_FGU_INT_STS		0x1c
  31#define SC27XX_FGU_VOLTAGE		0x20
  32#define SC27XX_FGU_OCV			0x24
  33#define SC27XX_FGU_POCV			0x28
  34#define SC27XX_FGU_CURRENT		0x2c
  35#define SC27XX_FGU_LOW_OVERLOAD		0x34
  36#define SC27XX_FGU_CLBCNT_SETH		0x50
  37#define SC27XX_FGU_CLBCNT_SETL		0x54
  38#define SC27XX_FGU_CLBCNT_DELTH		0x58
  39#define SC27XX_FGU_CLBCNT_DELTL		0x5c
  40#define SC27XX_FGU_CLBCNT_VALH		0x68
  41#define SC27XX_FGU_CLBCNT_VALL		0x6c
  42#define SC27XX_FGU_CLBCNT_QMAXL		0x74
  43#define SC27XX_FGU_USER_AREA_SET	0xa0
  44#define SC27XX_FGU_USER_AREA_CLEAR	0xa4
  45#define SC27XX_FGU_USER_AREA_STATUS	0xa8
  46#define SC27XX_FGU_VOLTAGE_BUF		0xd0
  47#define SC27XX_FGU_CURRENT_BUF		0xf0
  48
  49#define SC27XX_WRITE_SELCLB_EN		BIT(0)
  50#define SC27XX_FGU_CLBCNT_MASK		GENMASK(15, 0)
  51#define SC27XX_FGU_CLBCNT_SHIFT		16
  52#define SC27XX_FGU_LOW_OVERLOAD_MASK	GENMASK(12, 0)
  53
  54#define SC27XX_FGU_INT_MASK		GENMASK(9, 0)
  55#define SC27XX_FGU_LOW_OVERLOAD_INT	BIT(0)
  56#define SC27XX_FGU_CLBCNT_DELTA_INT	BIT(2)
  57
  58#define SC27XX_FGU_MODE_AREA_MASK	GENMASK(15, 12)
  59#define SC27XX_FGU_CAP_AREA_MASK	GENMASK(11, 0)
  60#define SC27XX_FGU_MODE_AREA_SHIFT	12
  61
  62#define SC27XX_FGU_FIRST_POWERTON	GENMASK(3, 0)
  63#define SC27XX_FGU_DEFAULT_CAP		GENMASK(11, 0)
  64#define SC27XX_FGU_NORMAIL_POWERTON	0x5
  65
  66#define SC27XX_FGU_CUR_BASIC_ADC	8192
  67#define SC27XX_FGU_SAMPLE_HZ		2
  68/* micro Ohms */
  69#define SC27XX_FGU_IDEAL_RESISTANCE	20000
  70
  71/*
  72 * struct sc27xx_fgu_data: describe the FGU device
  73 * @regmap: regmap for register access
  74 * @dev: platform device
  75 * @battery: battery power supply
  76 * @base: the base offset for the controller
  77 * @lock: protect the structure
  78 * @gpiod: GPIO for battery detection
  79 * @channel: IIO channel to get battery temperature
  80 * @charge_chan: IIO channel to get charge voltage
  81 * @internal_resist: the battery internal resistance in mOhm
  82 * @total_cap: the total capacity of the battery in mAh
  83 * @init_cap: the initial capacity of the battery in mAh
  84 * @alarm_cap: the alarm capacity
  85 * @init_clbcnt: the initial coulomb counter
  86 * @max_volt: the maximum constant input voltage in millivolt
  87 * @min_volt: the minimum drained battery voltage in microvolt
  88 * @boot_volt: the voltage measured during boot in microvolt
  89 * @table_len: the capacity table length
  90 * @resist_table_len: the resistance table length
  91 * @cur_1000ma_adc: ADC value corresponding to 1000 mA
  92 * @vol_1000mv_adc: ADC value corresponding to 1000 mV
  93 * @calib_resist: the real resistance of coulomb counter chip in uOhm
  94 * @cap_table: capacity table with corresponding ocv
  95 * @resist_table: resistance percent table with corresponding temperature
  96 */
  97struct sc27xx_fgu_data {
  98	struct regmap *regmap;
  99	struct device *dev;
 100	struct power_supply *battery;
 101	u32 base;
 102	struct mutex lock;
 103	struct gpio_desc *gpiod;
 104	struct iio_channel *channel;
 105	struct iio_channel *charge_chan;
 106	bool bat_present;
 107	int internal_resist;
 108	int total_cap;
 109	int init_cap;
 110	int alarm_cap;
 111	int init_clbcnt;
 112	int max_volt;
 113	int min_volt;
 114	int boot_volt;
 115	int table_len;
 116	int resist_table_len;
 117	int cur_1000ma_adc;
 118	int vol_1000mv_adc;
 119	int calib_resist;
 120	struct power_supply_battery_ocv_table *cap_table;
 121	struct power_supply_resistance_temp_table *resist_table;
 122};
 123
 124static int sc27xx_fgu_cap_to_clbcnt(struct sc27xx_fgu_data *data, int capacity);
 125static void sc27xx_fgu_capacity_calibration(struct sc27xx_fgu_data *data,
 126					    int cap, bool int_mode);
 127static void sc27xx_fgu_adjust_cap(struct sc27xx_fgu_data *data, int cap);
 128static int sc27xx_fgu_get_temp(struct sc27xx_fgu_data *data, int *temp);
 129
 130static const char * const sc27xx_charger_supply_name[] = {
 131	"sc2731_charger",
 132	"sc2720_charger",
 133	"sc2721_charger",
 134	"sc2723_charger",
 135};
 136
 137static int sc27xx_fgu_adc_to_current(struct sc27xx_fgu_data *data, s64 adc)
 138{
 139	return DIV_S64_ROUND_CLOSEST(adc * 1000, data->cur_1000ma_adc);
 140}
 141
 142static int sc27xx_fgu_adc_to_voltage(struct sc27xx_fgu_data *data, s64 adc)
 143{
 144	return DIV_S64_ROUND_CLOSEST(adc * 1000, data->vol_1000mv_adc);
 145}
 146
 147static int sc27xx_fgu_voltage_to_adc(struct sc27xx_fgu_data *data, int vol)
 148{
 149	return DIV_ROUND_CLOSEST(vol * data->vol_1000mv_adc, 1000);
 150}
 151
 152static bool sc27xx_fgu_is_first_poweron(struct sc27xx_fgu_data *data)
 153{
 154	int ret, status, cap, mode;
 155
 156	ret = regmap_read(data->regmap,
 157			  data->base + SC27XX_FGU_USER_AREA_STATUS, &status);
 158	if (ret)
 159		return false;
 160
 161	/*
 162	 * We use low 4 bits to save the last battery capacity and high 12 bits
 163	 * to save the system boot mode.
 164	 */
 165	mode = (status & SC27XX_FGU_MODE_AREA_MASK) >> SC27XX_FGU_MODE_AREA_SHIFT;
 166	cap = status & SC27XX_FGU_CAP_AREA_MASK;
 167
 168	/*
 169	 * When FGU has been powered down, the user area registers became
 170	 * default value (0xffff), which can be used to valid if the system is
 171	 * first power on or not.
 172	 */
 173	if (mode == SC27XX_FGU_FIRST_POWERTON || cap == SC27XX_FGU_DEFAULT_CAP)
 174		return true;
 175
 176	return false;
 177}
 178
 179static int sc27xx_fgu_save_boot_mode(struct sc27xx_fgu_data *data,
 180				     int boot_mode)
 181{
 182	int ret;
 183
 184	ret = regmap_update_bits(data->regmap,
 185				 data->base + SC27XX_FGU_USER_AREA_CLEAR,
 186				 SC27XX_FGU_MODE_AREA_MASK,
 187				 SC27XX_FGU_MODE_AREA_MASK);
 188	if (ret)
 189		return ret;
 190
 191	/*
 192	 * Since the user area registers are put on power always-on region,
 193	 * then these registers changing time will be a little long. Thus
 194	 * here we should delay 200us to wait until values are updated
 195	 * successfully according to the datasheet.
 196	 */
 197	udelay(200);
 198
 199	ret = regmap_update_bits(data->regmap,
 200				 data->base + SC27XX_FGU_USER_AREA_SET,
 201				 SC27XX_FGU_MODE_AREA_MASK,
 202				 boot_mode << SC27XX_FGU_MODE_AREA_SHIFT);
 203	if (ret)
 204		return ret;
 205
 206	/*
 207	 * Since the user area registers are put on power always-on region,
 208	 * then these registers changing time will be a little long. Thus
 209	 * here we should delay 200us to wait until values are updated
 210	 * successfully according to the datasheet.
 211	 */
 212	udelay(200);
 213
 214	/*
 215	 * According to the datasheet, we should set the USER_AREA_CLEAR to 0 to
 216	 * make the user area data available, otherwise we can not save the user
 217	 * area data.
 218	 */
 219	return regmap_update_bits(data->regmap,
 220				  data->base + SC27XX_FGU_USER_AREA_CLEAR,
 221				  SC27XX_FGU_MODE_AREA_MASK, 0);
 222}
 223
 224static int sc27xx_fgu_save_last_cap(struct sc27xx_fgu_data *data, int cap)
 225{
 226	int ret;
 227
 228	ret = regmap_update_bits(data->regmap,
 229				 data->base + SC27XX_FGU_USER_AREA_CLEAR,
 230				 SC27XX_FGU_CAP_AREA_MASK,
 231				 SC27XX_FGU_CAP_AREA_MASK);
 232	if (ret)
 233		return ret;
 234
 235	/*
 236	 * Since the user area registers are put on power always-on region,
 237	 * then these registers changing time will be a little long. Thus
 238	 * here we should delay 200us to wait until values are updated
 239	 * successfully according to the datasheet.
 240	 */
 241	udelay(200);
 242
 243	ret = regmap_update_bits(data->regmap,
 244				 data->base + SC27XX_FGU_USER_AREA_SET,
 245				 SC27XX_FGU_CAP_AREA_MASK, cap);
 246	if (ret)
 247		return ret;
 248
 249	/*
 250	 * Since the user area registers are put on power always-on region,
 251	 * then these registers changing time will be a little long. Thus
 252	 * here we should delay 200us to wait until values are updated
 253	 * successfully according to the datasheet.
 254	 */
 255	udelay(200);
 256
 257	/*
 258	 * According to the datasheet, we should set the USER_AREA_CLEAR to 0 to
 259	 * make the user area data available, otherwise we can not save the user
 260	 * area data.
 261	 */
 262	return regmap_update_bits(data->regmap,
 263				  data->base + SC27XX_FGU_USER_AREA_CLEAR,
 264				  SC27XX_FGU_CAP_AREA_MASK, 0);
 265}
 266
 267static int sc27xx_fgu_read_last_cap(struct sc27xx_fgu_data *data, int *cap)
 268{
 269	int ret, value;
 270
 271	ret = regmap_read(data->regmap,
 272			  data->base + SC27XX_FGU_USER_AREA_STATUS, &value);
 273	if (ret)
 274		return ret;
 275
 276	*cap = value & SC27XX_FGU_CAP_AREA_MASK;
 277	return 0;
 278}
 279
 280/*
 281 * When system boots on, we can not read battery capacity from coulomb
 282 * registers, since now the coulomb registers are invalid. So we should
 283 * calculate the battery open circuit voltage, and get current battery
 284 * capacity according to the capacity table.
 285 */
 286static int sc27xx_fgu_get_boot_capacity(struct sc27xx_fgu_data *data, int *cap)
 287{
 288	int volt, cur, oci, ocv, ret;
 289	bool is_first_poweron = sc27xx_fgu_is_first_poweron(data);
 290
 291	/*
 292	 * If system is not the first power on, we should use the last saved
 293	 * battery capacity as the initial battery capacity. Otherwise we should
 294	 * re-calculate the initial battery capacity.
 295	 */
 296	if (!is_first_poweron) {
 297		ret = sc27xx_fgu_read_last_cap(data, cap);
 298		if (ret)
 299			return ret;
 300
 301		return sc27xx_fgu_save_boot_mode(data, SC27XX_FGU_NORMAIL_POWERTON);
 302	}
 303
 304	/*
 305	 * After system booting on, the SC27XX_FGU_CLBCNT_QMAXL register saved
 306	 * the first sampled open circuit current.
 307	 */
 308	ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_QMAXL,
 309			  &cur);
 310	if (ret)
 311		return ret;
 312
 313	cur <<= 1;
 314	oci = sc27xx_fgu_adc_to_current(data, cur - SC27XX_FGU_CUR_BASIC_ADC);
 315
 316	/*
 317	 * Should get the OCV from SC27XX_FGU_POCV register at the system
 318	 * beginning. It is ADC values reading from registers which need to
 319	 * convert the corresponding voltage.
 320	 */
 321	ret = regmap_read(data->regmap, data->base + SC27XX_FGU_POCV, &volt);
 322	if (ret)
 323		return ret;
 324
 325	volt = sc27xx_fgu_adc_to_voltage(data, volt);
 326	ocv = volt * 1000 - oci * data->internal_resist;
 327	data->boot_volt = ocv;
 328
 329	/*
 330	 * Parse the capacity table to look up the correct capacity percent
 331	 * according to current battery's corresponding OCV values.
 332	 */
 333	*cap = power_supply_ocv2cap_simple(data->cap_table, data->table_len,
 334					   ocv);
 335
 336	ret = sc27xx_fgu_save_last_cap(data, *cap);
 337	if (ret)
 338		return ret;
 339
 340	return sc27xx_fgu_save_boot_mode(data, SC27XX_FGU_NORMAIL_POWERTON);
 341}
 342
 343static int sc27xx_fgu_set_clbcnt(struct sc27xx_fgu_data *data, int clbcnt)
 344{
 345	int ret;
 346
 347	ret = regmap_update_bits(data->regmap,
 348				 data->base + SC27XX_FGU_CLBCNT_SETL,
 349				 SC27XX_FGU_CLBCNT_MASK, clbcnt);
 350	if (ret)
 351		return ret;
 352
 353	ret = regmap_update_bits(data->regmap,
 354				 data->base + SC27XX_FGU_CLBCNT_SETH,
 355				 SC27XX_FGU_CLBCNT_MASK,
 356				 clbcnt >> SC27XX_FGU_CLBCNT_SHIFT);
 357	if (ret)
 358		return ret;
 359
 360	return regmap_update_bits(data->regmap, data->base + SC27XX_FGU_START,
 361				 SC27XX_WRITE_SELCLB_EN,
 362				 SC27XX_WRITE_SELCLB_EN);
 363}
 364
 365static int sc27xx_fgu_get_clbcnt(struct sc27xx_fgu_data *data, int *clb_cnt)
 366{
 367	int ccl, cch, ret;
 368
 369	ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_VALL,
 370			  &ccl);
 371	if (ret)
 372		return ret;
 373
 374	ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_VALH,
 375			  &cch);
 376	if (ret)
 377		return ret;
 378
 379	*clb_cnt = ccl & SC27XX_FGU_CLBCNT_MASK;
 380	*clb_cnt |= (cch & SC27XX_FGU_CLBCNT_MASK) << SC27XX_FGU_CLBCNT_SHIFT;
 381
 382	return 0;
 383}
 384
 385static int sc27xx_fgu_get_vol_now(struct sc27xx_fgu_data *data, int *val)
 386{
 387	int ret;
 388	u32 vol;
 389
 390	ret = regmap_read(data->regmap, data->base + SC27XX_FGU_VOLTAGE_BUF,
 391			  &vol);
 392	if (ret)
 393		return ret;
 394
 395	/*
 396	 * It is ADC values reading from registers which need to convert to
 397	 * corresponding voltage values.
 398	 */
 399	*val = sc27xx_fgu_adc_to_voltage(data, vol);
 400
 401	return 0;
 402}
 403
 404static int sc27xx_fgu_get_cur_now(struct sc27xx_fgu_data *data, int *val)
 405{
 406	int ret;
 407	u32 cur;
 408
 409	ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CURRENT_BUF,
 410			  &cur);
 411	if (ret)
 412		return ret;
 413
 414	/*
 415	 * It is ADC values reading from registers which need to convert to
 416	 * corresponding current values.
 417	 */
 418	*val = sc27xx_fgu_adc_to_current(data, cur - SC27XX_FGU_CUR_BASIC_ADC);
 419
 420	return 0;
 421}
 422
 423static int sc27xx_fgu_get_capacity(struct sc27xx_fgu_data *data, int *cap)
 424{
 425	int ret, cur_clbcnt, delta_clbcnt, delta_cap, temp;
 426
 427	/* Get current coulomb counters firstly */
 428	ret = sc27xx_fgu_get_clbcnt(data, &cur_clbcnt);
 429	if (ret)
 430		return ret;
 431
 432	delta_clbcnt = cur_clbcnt - data->init_clbcnt;
 433
 434	/*
 435	 * Convert coulomb counter to delta capacity (mAh), and set multiplier
 436	 * as 10 to improve the precision.
 437	 */
 438	temp = DIV_ROUND_CLOSEST(delta_clbcnt * 10, 36 * SC27XX_FGU_SAMPLE_HZ);
 439	temp = sc27xx_fgu_adc_to_current(data, temp / 1000);
 440
 441	/*
 442	 * Convert to capacity percent of the battery total capacity,
 443	 * and multiplier is 100 too.
 444	 */
 445	delta_cap = DIV_ROUND_CLOSEST(temp * 100, data->total_cap);
 446	*cap = delta_cap + data->init_cap;
 447
 448	/* Calibrate the battery capacity in a normal range. */
 449	sc27xx_fgu_capacity_calibration(data, *cap, false);
 450
 451	return 0;
 452}
 453
 454static int sc27xx_fgu_get_vbat_vol(struct sc27xx_fgu_data *data, int *val)
 455{
 456	int ret, vol;
 457
 458	ret = regmap_read(data->regmap, data->base + SC27XX_FGU_VOLTAGE, &vol);
 459	if (ret)
 460		return ret;
 461
 462	/*
 463	 * It is ADC values reading from registers which need to convert to
 464	 * corresponding voltage values.
 465	 */
 466	*val = sc27xx_fgu_adc_to_voltage(data, vol);
 467
 468	return 0;
 469}
 470
 471static int sc27xx_fgu_get_current(struct sc27xx_fgu_data *data, int *val)
 472{
 473	int ret, cur;
 474
 475	ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CURRENT, &cur);
 476	if (ret)
 477		return ret;
 478
 479	/*
 480	 * It is ADC values reading from registers which need to convert to
 481	 * corresponding current values.
 482	 */
 483	*val = sc27xx_fgu_adc_to_current(data, cur - SC27XX_FGU_CUR_BASIC_ADC);
 484
 485	return 0;
 486}
 487
 488static int sc27xx_fgu_get_vbat_ocv(struct sc27xx_fgu_data *data, int *val)
 489{
 490	int vol, cur, ret, temp, resistance;
 491
 492	ret = sc27xx_fgu_get_vbat_vol(data, &vol);
 493	if (ret)
 494		return ret;
 495
 496	ret = sc27xx_fgu_get_current(data, &cur);
 497	if (ret)
 498		return ret;
 499
 500	resistance = data->internal_resist;
 501	if (data->resist_table_len > 0) {
 502		ret = sc27xx_fgu_get_temp(data, &temp);
 503		if (ret)
 504			return ret;
 505
 506		resistance = power_supply_temp2resist_simple(data->resist_table,
 507						data->resist_table_len, temp);
 508		resistance = data->internal_resist * resistance / 100;
 509	}
 510
 511	/* Return the battery OCV in micro volts. */
 512	*val = vol * 1000 - cur * resistance;
 513
 514	return 0;
 515}
 516
 517static int sc27xx_fgu_get_charge_vol(struct sc27xx_fgu_data *data, int *val)
 518{
 519	int ret, vol;
 520
 521	ret = iio_read_channel_processed(data->charge_chan, &vol);
 522	if (ret < 0)
 523		return ret;
 524
 525	*val = vol * 1000;
 526	return 0;
 527}
 528
 529static int sc27xx_fgu_get_temp(struct sc27xx_fgu_data *data, int *temp)
 530{
 531	return iio_read_channel_processed(data->channel, temp);
 532}
 533
 534static int sc27xx_fgu_get_health(struct sc27xx_fgu_data *data, int *health)
 535{
 536	int ret, vol;
 537
 538	ret = sc27xx_fgu_get_vbat_vol(data, &vol);
 539	if (ret)
 540		return ret;
 541
 542	if (vol > data->max_volt)
 543		*health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 544	else
 545		*health = POWER_SUPPLY_HEALTH_GOOD;
 546
 547	return 0;
 548}
 549
 550static int sc27xx_fgu_get_status(struct sc27xx_fgu_data *data, int *status)
 551{
 552	union power_supply_propval val;
 553	struct power_supply *psy;
 554	int i, ret = -EINVAL;
 555
 556	for (i = 0; i < ARRAY_SIZE(sc27xx_charger_supply_name); i++) {
 557		psy = power_supply_get_by_name(sc27xx_charger_supply_name[i]);
 558		if (!psy)
 559			continue;
 560
 561		ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS,
 562						&val);
 563		power_supply_put(psy);
 564		if (ret)
 565			return ret;
 566
 567		*status = val.intval;
 568	}
 569
 570	return ret;
 571}
 572
 573static int sc27xx_fgu_get_property(struct power_supply *psy,
 574				   enum power_supply_property psp,
 575				   union power_supply_propval *val)
 576{
 577	struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy);
 578	int ret = 0;
 579	int value;
 580
 581	mutex_lock(&data->lock);
 582
 583	switch (psp) {
 584	case POWER_SUPPLY_PROP_STATUS:
 585		ret = sc27xx_fgu_get_status(data, &value);
 586		if (ret)
 587			goto error;
 588
 589		val->intval = value;
 590		break;
 591
 592	case POWER_SUPPLY_PROP_HEALTH:
 593		ret = sc27xx_fgu_get_health(data, &value);
 594		if (ret)
 595			goto error;
 596
 597		val->intval = value;
 598		break;
 599
 600	case POWER_SUPPLY_PROP_PRESENT:
 601		val->intval = data->bat_present;
 602		break;
 603
 604	case POWER_SUPPLY_PROP_TEMP:
 605		ret = sc27xx_fgu_get_temp(data, &value);
 606		if (ret)
 607			goto error;
 608
 609		val->intval = value;
 610		break;
 611
 612	case POWER_SUPPLY_PROP_TECHNOLOGY:
 613		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 614		break;
 615
 616	case POWER_SUPPLY_PROP_CAPACITY:
 617		ret = sc27xx_fgu_get_capacity(data, &value);
 618		if (ret)
 619			goto error;
 620
 621		val->intval = value;
 622		break;
 623
 624	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
 625		ret = sc27xx_fgu_get_vbat_vol(data, &value);
 626		if (ret)
 627			goto error;
 628
 629		val->intval = value * 1000;
 630		break;
 631
 632	case POWER_SUPPLY_PROP_VOLTAGE_OCV:
 633		ret = sc27xx_fgu_get_vbat_ocv(data, &value);
 634		if (ret)
 635			goto error;
 636
 637		val->intval = value;
 638		break;
 639
 640	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 641		ret = sc27xx_fgu_get_charge_vol(data, &value);
 642		if (ret)
 643			goto error;
 644
 645		val->intval = value;
 646		break;
 647
 648	case POWER_SUPPLY_PROP_CURRENT_AVG:
 649		ret = sc27xx_fgu_get_current(data, &value);
 650		if (ret)
 651			goto error;
 652
 653		val->intval = value * 1000;
 654		break;
 655
 656	case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 657		val->intval = data->total_cap * 1000;
 658		break;
 659
 660	case POWER_SUPPLY_PROP_CHARGE_NOW:
 661		ret = sc27xx_fgu_get_clbcnt(data, &value);
 662		if (ret)
 663			goto error;
 664
 665		value = DIV_ROUND_CLOSEST(value * 10,
 666					  36 * SC27XX_FGU_SAMPLE_HZ);
 667		val->intval = sc27xx_fgu_adc_to_current(data, value);
 668
 669		break;
 670
 671	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 672		ret = sc27xx_fgu_get_vol_now(data, &value);
 673		if (ret)
 674			goto error;
 675
 676		val->intval = value * 1000;
 677		break;
 678
 679	case POWER_SUPPLY_PROP_CURRENT_NOW:
 680		ret = sc27xx_fgu_get_cur_now(data, &value);
 681		if (ret)
 682			goto error;
 683
 684		val->intval = value * 1000;
 685		break;
 686
 687	case POWER_SUPPLY_PROP_VOLTAGE_BOOT:
 688		val->intval = data->boot_volt;
 689		break;
 690
 691	default:
 692		ret = -EINVAL;
 693		break;
 694	}
 695
 696error:
 697	mutex_unlock(&data->lock);
 698	return ret;
 699}
 700
 701static int sc27xx_fgu_set_property(struct power_supply *psy,
 702				   enum power_supply_property psp,
 703				   const union power_supply_propval *val)
 704{
 705	struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy);
 706	int ret;
 707
 708	mutex_lock(&data->lock);
 709
 710	switch (psp) {
 711	case POWER_SUPPLY_PROP_CAPACITY:
 712		ret = sc27xx_fgu_save_last_cap(data, val->intval);
 713		if (ret < 0)
 714			dev_err(data->dev, "failed to save battery capacity\n");
 715		break;
 716
 717	case POWER_SUPPLY_PROP_CALIBRATE:
 718		sc27xx_fgu_adjust_cap(data, val->intval);
 719		ret = 0;
 720		break;
 721
 722	case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 723		data->total_cap = val->intval / 1000;
 724		ret = 0;
 725		break;
 726
 727	default:
 728		ret = -EINVAL;
 729	}
 730
 731	mutex_unlock(&data->lock);
 732
 733	return ret;
 734}
 735
 736static int sc27xx_fgu_property_is_writeable(struct power_supply *psy,
 737					    enum power_supply_property psp)
 738{
 739	return psp == POWER_SUPPLY_PROP_CAPACITY ||
 740		psp == POWER_SUPPLY_PROP_CALIBRATE ||
 741		psp == POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN;
 742}
 743
 744static enum power_supply_property sc27xx_fgu_props[] = {
 745	POWER_SUPPLY_PROP_STATUS,
 746	POWER_SUPPLY_PROP_HEALTH,
 747	POWER_SUPPLY_PROP_PRESENT,
 748	POWER_SUPPLY_PROP_TEMP,
 749	POWER_SUPPLY_PROP_TECHNOLOGY,
 750	POWER_SUPPLY_PROP_CAPACITY,
 751	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 752	POWER_SUPPLY_PROP_VOLTAGE_OCV,
 753	POWER_SUPPLY_PROP_VOLTAGE_AVG,
 754	POWER_SUPPLY_PROP_VOLTAGE_BOOT,
 755	POWER_SUPPLY_PROP_CURRENT_NOW,
 756	POWER_SUPPLY_PROP_CURRENT_AVG,
 757	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 758	POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 759	POWER_SUPPLY_PROP_CALIBRATE,
 760	POWER_SUPPLY_PROP_CHARGE_NOW
 761};
 762
 763static const struct power_supply_desc sc27xx_fgu_desc = {
 764	.name			= "sc27xx-fgu",
 765	.type			= POWER_SUPPLY_TYPE_BATTERY,
 766	.properties		= sc27xx_fgu_props,
 767	.num_properties		= ARRAY_SIZE(sc27xx_fgu_props),
 768	.get_property		= sc27xx_fgu_get_property,
 769	.set_property		= sc27xx_fgu_set_property,
 770	.external_power_changed	= power_supply_changed,
 771	.property_is_writeable	= sc27xx_fgu_property_is_writeable,
 772	.no_thermal		= true,
 773};
 774
 775static void sc27xx_fgu_adjust_cap(struct sc27xx_fgu_data *data, int cap)
 776{
 777	int ret;
 778
 779	data->init_cap = cap;
 780	ret = sc27xx_fgu_get_clbcnt(data, &data->init_clbcnt);
 781	if (ret)
 782		dev_err(data->dev, "failed to get init coulomb counter\n");
 783}
 784
 785static void sc27xx_fgu_capacity_calibration(struct sc27xx_fgu_data *data,
 786					    int cap, bool int_mode)
 787{
 788	int ret, ocv, chg_sts, adc;
 789
 790	ret = sc27xx_fgu_get_vbat_ocv(data, &ocv);
 791	if (ret) {
 792		dev_err(data->dev, "get battery ocv error.\n");
 793		return;
 794	}
 795
 796	ret = sc27xx_fgu_get_status(data, &chg_sts);
 797	if (ret) {
 798		dev_err(data->dev, "get charger status error.\n");
 799		return;
 800	}
 801
 802	/*
 803	 * If we are in charging mode, then we do not need to calibrate the
 804	 * lower capacity.
 805	 */
 806	if (chg_sts == POWER_SUPPLY_STATUS_CHARGING)
 807		return;
 808
 809	if ((ocv > data->cap_table[0].ocv && cap < 100) || cap > 100) {
 810		/*
 811		 * If current OCV value is larger than the max OCV value in
 812		 * OCV table, or the current capacity is larger than 100,
 813		 * we should force the inititial capacity to 100.
 814		 */
 815		sc27xx_fgu_adjust_cap(data, 100);
 816	} else if (ocv <= data->cap_table[data->table_len - 1].ocv) {
 817		/*
 818		 * If current OCV value is leass than the minimum OCV value in
 819		 * OCV table, we should force the inititial capacity to 0.
 820		 */
 821		sc27xx_fgu_adjust_cap(data, 0);
 822	} else if ((ocv > data->cap_table[data->table_len - 1].ocv && cap <= 0) ||
 823		   (ocv > data->min_volt && cap <= data->alarm_cap)) {
 824		/*
 825		 * If current OCV value is not matchable with current capacity,
 826		 * we should re-calculate current capacity by looking up the
 827		 * OCV table.
 828		 */
 829		int cur_cap = power_supply_ocv2cap_simple(data->cap_table,
 830							  data->table_len, ocv);
 831
 832		sc27xx_fgu_adjust_cap(data, cur_cap);
 833	} else if (ocv <= data->min_volt) {
 834		/*
 835		 * If current OCV value is less than the low alarm voltage, but
 836		 * current capacity is larger than the alarm capacity, we should
 837		 * adjust the inititial capacity to alarm capacity.
 838		 */
 839		if (cap > data->alarm_cap) {
 840			sc27xx_fgu_adjust_cap(data, data->alarm_cap);
 841		} else {
 842			int cur_cap;
 843
 844			/*
 845			 * If current capacity is equal with 0 or less than 0
 846			 * (some error occurs), we should adjust inititial
 847			 * capacity to the capacity corresponding to current OCV
 848			 * value.
 849			 */
 850			cur_cap = power_supply_ocv2cap_simple(data->cap_table,
 851							      data->table_len,
 852							      ocv);
 853			sc27xx_fgu_adjust_cap(data, cur_cap);
 854		}
 855
 856		if (!int_mode)
 857			return;
 858
 859		/*
 860		 * After adjusting the battery capacity, we should set the
 861		 * lowest alarm voltage instead.
 862		 */
 863		data->min_volt = data->cap_table[data->table_len - 1].ocv;
 864		data->alarm_cap = power_supply_ocv2cap_simple(data->cap_table,
 865							      data->table_len,
 866							      data->min_volt);
 867
 868		adc = sc27xx_fgu_voltage_to_adc(data, data->min_volt / 1000);
 869		regmap_update_bits(data->regmap,
 870				   data->base + SC27XX_FGU_LOW_OVERLOAD,
 871				   SC27XX_FGU_LOW_OVERLOAD_MASK, adc);
 872	}
 873}
 874
 875static irqreturn_t sc27xx_fgu_interrupt(int irq, void *dev_id)
 876{
 877	struct sc27xx_fgu_data *data = dev_id;
 878	int ret, cap;
 879	u32 status;
 880
 881	mutex_lock(&data->lock);
 882
 883	ret = regmap_read(data->regmap, data->base + SC27XX_FGU_INT_STS,
 884			  &status);
 885	if (ret)
 886		goto out;
 887
 888	ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_INT_CLR,
 889				 status, status);
 890	if (ret)
 891		goto out;
 892
 893	/*
 894	 * When low overload voltage interrupt happens, we should calibrate the
 895	 * battery capacity in lower voltage stage.
 896	 */
 897	if (!(status & SC27XX_FGU_LOW_OVERLOAD_INT))
 898		goto out;
 899
 900	ret = sc27xx_fgu_get_capacity(data, &cap);
 901	if (ret)
 902		goto out;
 903
 904	sc27xx_fgu_capacity_calibration(data, cap, true);
 905
 906out:
 907	mutex_unlock(&data->lock);
 908
 909	power_supply_changed(data->battery);
 910	return IRQ_HANDLED;
 911}
 912
 913static irqreturn_t sc27xx_fgu_bat_detection(int irq, void *dev_id)
 914{
 915	struct sc27xx_fgu_data *data = dev_id;
 916	int state;
 917
 918	mutex_lock(&data->lock);
 919
 920	state = gpiod_get_value_cansleep(data->gpiod);
 921	if (state < 0) {
 922		dev_err(data->dev, "failed to get gpio state\n");
 923		mutex_unlock(&data->lock);
 924		return IRQ_RETVAL(state);
 925	}
 926
 927	data->bat_present = !!state;
 928
 929	mutex_unlock(&data->lock);
 930
 931	power_supply_changed(data->battery);
 932	return IRQ_HANDLED;
 933}
 934
 935static void sc27xx_fgu_disable(void *_data)
 936{
 937	struct sc27xx_fgu_data *data = _data;
 938
 939	regmap_update_bits(data->regmap, SC27XX_CLK_EN0, SC27XX_FGU_RTC_EN, 0);
 940	regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, SC27XX_FGU_EN, 0);
 941}
 942
 943static int sc27xx_fgu_cap_to_clbcnt(struct sc27xx_fgu_data *data, int capacity)
 944{
 945	/*
 946	 * Get current capacity (mAh) = battery total capacity (mAh) *
 947	 * current capacity percent (capacity / 100).
 948	 */
 949	int cur_cap = DIV_ROUND_CLOSEST(data->total_cap * capacity, 100);
 950
 951	/*
 952	 * Convert current capacity (mAh) to coulomb counter according to the
 953	 * formula: 1 mAh =3.6 coulomb.
 954	 */
 955	return DIV_ROUND_CLOSEST(cur_cap * 36 * data->cur_1000ma_adc * SC27XX_FGU_SAMPLE_HZ, 10);
 956}
 957
 958static int sc27xx_fgu_calibration(struct sc27xx_fgu_data *data)
 959{
 960	struct nvmem_cell *cell;
 961	int calib_data, cal_4200mv;
 962	void *buf;
 963	size_t len;
 964
 965	cell = nvmem_cell_get(data->dev, "fgu_calib");
 966	if (IS_ERR(cell))
 967		return PTR_ERR(cell);
 968
 969	buf = nvmem_cell_read(cell, &len);
 970	nvmem_cell_put(cell);
 971
 972	if (IS_ERR(buf))
 973		return PTR_ERR(buf);
 974
 975	memcpy(&calib_data, buf, min(len, sizeof(u32)));
 976
 977	/*
 978	 * Get the ADC value corresponding to 4200 mV from eFuse controller
 979	 * according to below formula. Then convert to ADC values corresponding
 980	 * to 1000 mV and 1000 mA.
 981	 */
 982	cal_4200mv = (calib_data & 0x1ff) + 6963 - 4096 - 256;
 983	data->vol_1000mv_adc = DIV_ROUND_CLOSEST(cal_4200mv * 10, 42);
 984	data->cur_1000ma_adc =
 985		DIV_ROUND_CLOSEST(data->vol_1000mv_adc * 4 * data->calib_resist,
 986				  SC27XX_FGU_IDEAL_RESISTANCE);
 987
 988	kfree(buf);
 989	return 0;
 990}
 991
 992static int sc27xx_fgu_hw_init(struct sc27xx_fgu_data *data)
 993{
 994	struct power_supply_battery_info *info;
 995	const struct power_supply_battery_ocv_table *table;
 996	int ret, delta_clbcnt, alarm_adc;
 997
 998	ret = power_supply_get_battery_info(data->battery, &info);
 999	if (ret) {
1000		dev_err(data->dev, "failed to get battery information\n");
1001		return ret;
1002	}
1003
1004	data->total_cap = info->charge_full_design_uah / 1000;
1005	data->max_volt = info->constant_charge_voltage_max_uv / 1000;
1006	data->internal_resist = info->factory_internal_resistance_uohm / 1000;
1007	data->min_volt = info->voltage_min_design_uv;
1008
1009	/*
1010	 * For SC27XX fuel gauge device, we only use one ocv-capacity
1011	 * table in normal temperature 20 Celsius.
1012	 */
1013	table = power_supply_find_ocv2cap_table(info, 20, &data->table_len);
1014	if (!table)
1015		return -EINVAL;
1016
1017	data->cap_table = devm_kmemdup_array(data->dev, table, data->table_len,
1018					     sizeof(*table), GFP_KERNEL);
1019	if (!data->cap_table) {
1020		power_supply_put_battery_info(data->battery, info);
1021		return -ENOMEM;
1022	}
1023
1024	data->alarm_cap = power_supply_ocv2cap_simple(data->cap_table,
1025						      data->table_len,
1026						      data->min_volt);
1027	if (!data->alarm_cap)
1028		data->alarm_cap += 1;
1029
1030	data->resist_table_len = info->resist_table_size;
1031	if (data->resist_table_len > 0) {
1032		data->resist_table = devm_kmemdup(data->dev, info->resist_table,
1033						  data->resist_table_len *
1034						  sizeof(struct power_supply_resistance_temp_table),
1035						  GFP_KERNEL);
1036		if (!data->resist_table) {
1037			power_supply_put_battery_info(data->battery, info);
1038			return -ENOMEM;
1039		}
1040	}
1041
1042	power_supply_put_battery_info(data->battery, info);
1043
1044	ret = sc27xx_fgu_calibration(data);
1045	if (ret)
1046		return ret;
1047
1048	/* Enable the FGU module */
1049	ret = regmap_update_bits(data->regmap, SC27XX_MODULE_EN0,
1050				 SC27XX_FGU_EN, SC27XX_FGU_EN);
1051	if (ret) {
1052		dev_err(data->dev, "failed to enable fgu\n");
1053		return ret;
1054	}
1055
1056	/* Enable the FGU RTC clock to make it work */
1057	ret = regmap_update_bits(data->regmap, SC27XX_CLK_EN0,
1058				 SC27XX_FGU_RTC_EN, SC27XX_FGU_RTC_EN);
1059	if (ret) {
1060		dev_err(data->dev, "failed to enable fgu RTC clock\n");
1061		goto disable_fgu;
1062	}
1063
1064	ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_INT_CLR,
1065				 SC27XX_FGU_INT_MASK, SC27XX_FGU_INT_MASK);
1066	if (ret) {
1067		dev_err(data->dev, "failed to clear interrupt status\n");
1068		goto disable_clk;
1069	}
1070
1071	/*
1072	 * Set the voltage low overload threshold, which means when the battery
1073	 * voltage is lower than this threshold, the controller will generate
1074	 * one interrupt to notify.
1075	 */
1076	alarm_adc = sc27xx_fgu_voltage_to_adc(data, data->min_volt / 1000);
1077	ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_LOW_OVERLOAD,
1078				 SC27XX_FGU_LOW_OVERLOAD_MASK, alarm_adc);
1079	if (ret) {
1080		dev_err(data->dev, "failed to set fgu low overload\n");
1081		goto disable_clk;
1082	}
1083
1084	/*
1085	 * Set the coulomb counter delta threshold, that means when the coulomb
1086	 * counter change is multiples of the delta threshold, the controller
1087	 * will generate one interrupt to notify the users to update the battery
1088	 * capacity. Now we set the delta threshold as a counter value of 1%
1089	 * capacity.
1090	 */
1091	delta_clbcnt = sc27xx_fgu_cap_to_clbcnt(data, 1);
1092
1093	ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_CLBCNT_DELTL,
1094				 SC27XX_FGU_CLBCNT_MASK, delta_clbcnt);
1095	if (ret) {
1096		dev_err(data->dev, "failed to set low delta coulomb counter\n");
1097		goto disable_clk;
1098	}
1099
1100	ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_CLBCNT_DELTH,
1101				 SC27XX_FGU_CLBCNT_MASK,
1102				 delta_clbcnt >> SC27XX_FGU_CLBCNT_SHIFT);
1103	if (ret) {
1104		dev_err(data->dev, "failed to set high delta coulomb counter\n");
1105		goto disable_clk;
1106	}
1107
1108	/*
1109	 * Get the boot battery capacity when system powers on, which is used to
1110	 * initialize the coulomb counter. After that, we can read the coulomb
1111	 * counter to measure the battery capacity.
1112	 */
1113	ret = sc27xx_fgu_get_boot_capacity(data, &data->init_cap);
1114	if (ret) {
1115		dev_err(data->dev, "failed to get boot capacity\n");
1116		goto disable_clk;
1117	}
1118
1119	/*
1120	 * Convert battery capacity to the corresponding initial coulomb counter
1121	 * and set into coulomb counter registers.
1122	 */
1123	data->init_clbcnt = sc27xx_fgu_cap_to_clbcnt(data, data->init_cap);
1124	ret = sc27xx_fgu_set_clbcnt(data, data->init_clbcnt);
1125	if (ret) {
1126		dev_err(data->dev, "failed to initialize coulomb counter\n");
1127		goto disable_clk;
1128	}
1129
1130	return 0;
1131
1132disable_clk:
1133	regmap_update_bits(data->regmap, SC27XX_CLK_EN0, SC27XX_FGU_RTC_EN, 0);
1134disable_fgu:
1135	regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, SC27XX_FGU_EN, 0);
1136
1137	return ret;
1138}
1139
1140static int sc27xx_fgu_probe(struct platform_device *pdev)
1141{
1142	struct device *dev = &pdev->dev;
1143	struct power_supply_config fgu_cfg = { };
1144	struct sc27xx_fgu_data *data;
1145	int ret, irq;
1146
1147	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
1148	if (!data)
1149		return -ENOMEM;
1150
1151	data->regmap = dev_get_regmap(dev->parent, NULL);
1152	if (!data->regmap) {
1153		dev_err(dev, "failed to get regmap\n");
1154		return -ENODEV;
1155	}
1156
1157	ret = device_property_read_u32(dev, "reg", &data->base);
1158	if (ret) {
1159		dev_err(dev, "failed to get fgu address\n");
1160		return ret;
1161	}
1162
1163	ret = device_property_read_u32(&pdev->dev,
1164				       "sprd,calib-resistance-micro-ohms",
1165				       &data->calib_resist);
1166	if (ret) {
1167		dev_err(&pdev->dev,
1168			"failed to get fgu calibration resistance\n");
1169		return ret;
1170	}
1171
1172	data->channel = devm_iio_channel_get(dev, "bat-temp");
1173	if (IS_ERR(data->channel)) {
1174		dev_err(dev, "failed to get IIO channel\n");
1175		return PTR_ERR(data->channel);
1176	}
1177
1178	data->charge_chan = devm_iio_channel_get(dev, "charge-vol");
1179	if (IS_ERR(data->charge_chan)) {
1180		dev_err(dev, "failed to get charge IIO channel\n");
1181		return PTR_ERR(data->charge_chan);
1182	}
1183
1184	data->gpiod = devm_gpiod_get(dev, "battery-detect", GPIOD_IN);
1185	if (IS_ERR(data->gpiod)) {
1186		data->gpiod = devm_gpiod_get(dev, "bat-detect", GPIOD_IN);
1187		if (IS_ERR(data->gpiod)) {
1188			dev_err(dev, "failed to get battery detection GPIO\n");
1189			return PTR_ERR(data->gpiod);
1190		}
1191		dev_warn(dev, "bat-detect is deprecated, please use battery-detect\n");
1192	}
1193
1194	ret = gpiod_get_value_cansleep(data->gpiod);
1195	if (ret < 0) {
1196		dev_err(dev, "failed to get gpio state\n");
1197		return ret;
1198	}
1199
1200	data->bat_present = !!ret;
1201	mutex_init(&data->lock);
1202	data->dev = dev;
1203	platform_set_drvdata(pdev, data);
1204
1205	fgu_cfg.drv_data = data;
1206	fgu_cfg.fwnode = dev_fwnode(dev);
1207	data->battery = devm_power_supply_register(dev, &sc27xx_fgu_desc,
1208						   &fgu_cfg);
1209	if (IS_ERR(data->battery)) {
1210		dev_err(dev, "failed to register power supply\n");
1211		return PTR_ERR(data->battery);
1212	}
1213
1214	ret = sc27xx_fgu_hw_init(data);
1215	if (ret) {
1216		dev_err(dev, "failed to initialize fgu hardware\n");
1217		return ret;
1218	}
1219
1220	ret = devm_add_action_or_reset(dev, sc27xx_fgu_disable, data);
1221	if (ret) {
1222		dev_err(dev, "failed to add fgu disable action\n");
1223		return ret;
1224	}
1225
1226	irq = platform_get_irq(pdev, 0);
1227	if (irq < 0)
1228		return irq;
1229
1230	ret = devm_request_threaded_irq(data->dev, irq, NULL,
1231					sc27xx_fgu_interrupt,
1232					IRQF_NO_SUSPEND | IRQF_ONESHOT,
1233					pdev->name, data);
1234	if (ret) {
1235		dev_err(data->dev, "failed to request fgu IRQ\n");
1236		return ret;
1237	}
1238
1239	irq = gpiod_to_irq(data->gpiod);
1240	if (irq < 0) {
1241		dev_err(dev, "failed to translate GPIO to IRQ\n");
1242		return irq;
1243	}
1244
1245	ret = devm_request_threaded_irq(dev, irq, NULL,
1246					sc27xx_fgu_bat_detection,
1247					IRQF_ONESHOT | IRQF_TRIGGER_RISING |
1248					IRQF_TRIGGER_FALLING,
1249					pdev->name, data);
1250	if (ret) {
1251		dev_err(dev, "failed to request IRQ\n");
1252		return ret;
1253	}
1254
1255	return 0;
1256}
1257
1258#ifdef CONFIG_PM_SLEEP
1259static int sc27xx_fgu_resume(struct device *dev)
1260{
1261	struct sc27xx_fgu_data *data = dev_get_drvdata(dev);
1262	int ret;
1263
1264	ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_INT_EN,
1265				 SC27XX_FGU_LOW_OVERLOAD_INT |
1266				 SC27XX_FGU_CLBCNT_DELTA_INT, 0);
1267	if (ret) {
1268		dev_err(data->dev, "failed to disable fgu interrupts\n");
1269		return ret;
1270	}
1271
1272	return 0;
1273}
1274
1275static int sc27xx_fgu_suspend(struct device *dev)
1276{
1277	struct sc27xx_fgu_data *data = dev_get_drvdata(dev);
1278	int ret, status, ocv;
1279
1280	ret = sc27xx_fgu_get_status(data, &status);
1281	if (ret)
1282		return ret;
1283
1284	/*
1285	 * If we are charging, then no need to enable the FGU interrupts to
1286	 * adjust the battery capacity.
1287	 */
1288	if (status != POWER_SUPPLY_STATUS_NOT_CHARGING &&
1289	    status != POWER_SUPPLY_STATUS_DISCHARGING)
1290		return 0;
1291
1292	ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_INT_EN,
1293				 SC27XX_FGU_LOW_OVERLOAD_INT,
1294				 SC27XX_FGU_LOW_OVERLOAD_INT);
1295	if (ret) {
1296		dev_err(data->dev, "failed to enable low voltage interrupt\n");
1297		return ret;
1298	}
1299
1300	ret = sc27xx_fgu_get_vbat_ocv(data, &ocv);
1301	if (ret)
1302		goto disable_int;
1303
1304	/*
1305	 * If current OCV is less than the minimum voltage, we should enable the
1306	 * coulomb counter threshold interrupt to notify events to adjust the
1307	 * battery capacity.
1308	 */
1309	if (ocv < data->min_volt) {
1310		ret = regmap_update_bits(data->regmap,
1311					 data->base + SC27XX_FGU_INT_EN,
1312					 SC27XX_FGU_CLBCNT_DELTA_INT,
1313					 SC27XX_FGU_CLBCNT_DELTA_INT);
1314		if (ret) {
1315			dev_err(data->dev,
1316				"failed to enable coulomb threshold int\n");
1317			goto disable_int;
1318		}
1319	}
1320
1321	return 0;
1322
1323disable_int:
1324	regmap_update_bits(data->regmap, data->base + SC27XX_FGU_INT_EN,
1325			   SC27XX_FGU_LOW_OVERLOAD_INT, 0);
1326	return ret;
1327}
1328#endif
1329
1330static const struct dev_pm_ops sc27xx_fgu_pm_ops = {
1331	SET_SYSTEM_SLEEP_PM_OPS(sc27xx_fgu_suspend, sc27xx_fgu_resume)
1332};
1333
1334static const struct of_device_id sc27xx_fgu_of_match[] = {
1335	{ .compatible = "sprd,sc2731-fgu", },
1336	{ }
1337};
1338MODULE_DEVICE_TABLE(of, sc27xx_fgu_of_match);
1339
1340static struct platform_driver sc27xx_fgu_driver = {
1341	.probe = sc27xx_fgu_probe,
1342	.driver = {
1343		.name = "sc27xx-fgu",
1344		.of_match_table = sc27xx_fgu_of_match,
1345		.pm = &sc27xx_fgu_pm_ops,
1346	}
1347};
1348
1349module_platform_driver(sc27xx_fgu_driver);
1350
1351MODULE_DESCRIPTION("Spreadtrum SC27XX PMICs Fual Gauge Unit Driver");
1352MODULE_LICENSE("GPL v2");