diff options
Diffstat (limited to 'drivers/power/supply/max17042_battery.c')
| -rw-r--r-- | drivers/power/supply/max17042_battery.c | 1019 |
1 files changed, 1019 insertions, 0 deletions
diff --git a/drivers/power/supply/max17042_battery.c b/drivers/power/supply/max17042_battery.c new file mode 100644 index 000000000000..da7a75f82489 --- /dev/null +++ b/drivers/power/supply/max17042_battery.c @@ -0,0 +1,1019 @@ +/* + * Fuel gauge driver for Maxim 17042 / 8966 / 8997 + * Note that Maxim 8966 and 8997 are mfd and this is its subdevice. + * + * Copyright (C) 2011 Samsung Electronics + * MyungJoo Ham <myungjoo.ham@samsung.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * This driver is based on max17040_battery.c + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/i2c.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/pm.h> +#include <linux/mod_devicetable.h> +#include <linux/power_supply.h> +#include <linux/power/max17042_battery.h> +#include <linux/of.h> +#include <linux/regmap.h> + +/* Status register bits */ +#define STATUS_POR_BIT (1 << 1) +#define STATUS_BST_BIT (1 << 3) +#define STATUS_VMN_BIT (1 << 8) +#define STATUS_TMN_BIT (1 << 9) +#define STATUS_SMN_BIT (1 << 10) +#define STATUS_BI_BIT (1 << 11) +#define STATUS_VMX_BIT (1 << 12) +#define STATUS_TMX_BIT (1 << 13) +#define STATUS_SMX_BIT (1 << 14) +#define STATUS_BR_BIT (1 << 15) + +/* Interrupt mask bits */ +#define CONFIG_ALRT_BIT_ENBL (1 << 2) +#define STATUS_INTR_SOCMIN_BIT (1 << 10) +#define STATUS_INTR_SOCMAX_BIT (1 << 14) + +#define VFSOC0_LOCK 0x0000 +#define VFSOC0_UNLOCK 0x0080 +#define MODEL_UNLOCK1 0X0059 +#define MODEL_UNLOCK2 0X00C4 +#define MODEL_LOCK1 0X0000 +#define MODEL_LOCK2 0X0000 + +#define dQ_ACC_DIV 0x4 +#define dP_ACC_100 0x1900 +#define dP_ACC_200 0x3200 + +#define MAX17042_VMAX_TOLERANCE 50 /* 50 mV */ + +struct max17042_chip { + struct i2c_client *client; + struct regmap *regmap; + struct power_supply *battery; + enum max170xx_chip_type chip_type; + struct max17042_platform_data *pdata; + struct work_struct work; + int init_complete; +}; + +static enum power_supply_property max17042_battery_props[] = { + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_CYCLE_COUNT, + POWER_SUPPLY_PROP_VOLTAGE_MAX, + POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_VOLTAGE_AVG, + POWER_SUPPLY_PROP_VOLTAGE_OCV, + POWER_SUPPLY_PROP_CAPACITY, + POWER_SUPPLY_PROP_CHARGE_FULL, + POWER_SUPPLY_PROP_CHARGE_COUNTER, + POWER_SUPPLY_PROP_TEMP, + POWER_SUPPLY_PROP_TEMP_ALERT_MIN, + POWER_SUPPLY_PROP_TEMP_ALERT_MAX, + POWER_SUPPLY_PROP_TEMP_MIN, + POWER_SUPPLY_PROP_TEMP_MAX, + POWER_SUPPLY_PROP_HEALTH, + POWER_SUPPLY_PROP_CURRENT_NOW, + POWER_SUPPLY_PROP_CURRENT_AVG, +}; + +static int max17042_get_temperature(struct max17042_chip *chip, int *temp) +{ + int ret; + u32 data; + struct regmap *map = chip->regmap; + + ret = regmap_read(map, MAX17042_TEMP, &data); + if (ret < 0) + return ret; + + *temp = data; + /* The value is signed. */ + if (*temp & 0x8000) { + *temp = (0x7fff & ~*temp) + 1; + *temp *= -1; + } + + /* The value is converted into deci-centigrade scale */ + /* Units of LSB = 1 / 256 degree Celsius */ + *temp = *temp * 10 / 256; + return 0; +} + +static int max17042_get_battery_health(struct max17042_chip *chip, int *health) +{ + int temp, vavg, vbatt, ret; + u32 val; + + ret = regmap_read(chip->regmap, MAX17042_AvgVCELL, &val); + if (ret < 0) + goto health_error; + + /* bits [0-3] unused */ + vavg = val * 625 / 8; + /* Convert to millivolts */ + vavg /= 1000; + + ret = regmap_read(chip->regmap, MAX17042_VCELL, &val); + if (ret < 0) + goto health_error; + + /* bits [0-3] unused */ + vbatt = val * 625 / 8; + /* Convert to millivolts */ + vbatt /= 1000; + + if (vavg < chip->pdata->vmin) { + *health = POWER_SUPPLY_HEALTH_DEAD; + goto out; + } + + if (vbatt > chip->pdata->vmax + MAX17042_VMAX_TOLERANCE) { + *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; + goto out; + } + + ret = max17042_get_temperature(chip, &temp); + if (ret < 0) + goto health_error; + + if (temp <= chip->pdata->temp_min) { + *health = POWER_SUPPLY_HEALTH_COLD; + goto out; + } + + if (temp >= chip->pdata->temp_max) { + *health = POWER_SUPPLY_HEALTH_OVERHEAT; + goto out; + } + + *health = POWER_SUPPLY_HEALTH_GOOD; + +out: + return 0; + +health_error: + return ret; +} + +static int max17042_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct max17042_chip *chip = power_supply_get_drvdata(psy); + struct regmap *map = chip->regmap; + int ret; + u32 data; + + if (!chip->init_complete) + return -EAGAIN; + + switch (psp) { + case POWER_SUPPLY_PROP_PRESENT: + ret = regmap_read(map, MAX17042_STATUS, &data); + if (ret < 0) + return ret; + + if (data & MAX17042_STATUS_BattAbsent) + val->intval = 0; + else + val->intval = 1; + break; + case POWER_SUPPLY_PROP_CYCLE_COUNT: + ret = regmap_read(map, MAX17042_Cycles, &data); + if (ret < 0) + return ret; + + val->intval = data; + break; + case POWER_SUPPLY_PROP_VOLTAGE_MAX: + ret = regmap_read(map, MAX17042_MinMaxVolt, &data); + if (ret < 0) + return ret; + + val->intval = data >> 8; + val->intval *= 20000; /* Units of LSB = 20mV */ + break; + case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: + if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) + ret = regmap_read(map, MAX17042_V_empty, &data); + else + ret = regmap_read(map, MAX17047_V_empty, &data); + if (ret < 0) + return ret; + + val->intval = data >> 7; + val->intval *= 10000; /* Units of LSB = 10mV */ + break; + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + ret = regmap_read(map, MAX17042_VCELL, &data); + if (ret < 0) + return ret; + + val->intval = data * 625 / 8; + break; + case POWER_SUPPLY_PROP_VOLTAGE_AVG: + ret = regmap_read(map, MAX17042_AvgVCELL, &data); + if (ret < 0) + return ret; + + val->intval = data * 625 / 8; + break; + case POWER_SUPPLY_PROP_VOLTAGE_OCV: + ret = regmap_read(map, MAX17042_OCVInternal, &data); + if (ret < 0) + return ret; + + val->intval = data * 625 / 8; + break; + case POWER_SUPPLY_PROP_CAPACITY: + ret = regmap_read(map, MAX17042_RepSOC, &data); + if (ret < 0) + return ret; + + val->intval = data >> 8; + break; + case POWER_SUPPLY_PROP_CHARGE_FULL: + ret = regmap_read(map, MAX17042_FullCAP, &data); + if (ret < 0) + return ret; + + val->intval = data * 1000 / 2; + break; + case POWER_SUPPLY_PROP_CHARGE_COUNTER: + ret = regmap_read(map, MAX17042_QH, &data); + if (ret < 0) + return ret; + + val->intval = data * 1000 / 2; + break; + case POWER_SUPPLY_PROP_TEMP: + ret = max17042_get_temperature(chip, &val->intval); + if (ret < 0) + return ret; + break; + case POWER_SUPPLY_PROP_TEMP_ALERT_MIN: + ret = regmap_read(map, MAX17042_TALRT_Th, &data); + if (ret < 0) + return ret; + /* LSB is Alert Minimum. In deci-centigrade */ + val->intval = (data & 0xff) * 10; + break; + case POWER_SUPPLY_PROP_TEMP_ALERT_MAX: + ret = regmap_read(map, MAX17042_TALRT_Th, &data); + if (ret < 0) + return ret; + /* MSB is Alert Maximum. In deci-centigrade */ + val->intval = (data >> 8) * 10; + break; + case POWER_SUPPLY_PROP_TEMP_MIN: + val->intval = chip->pdata->temp_min; + break; + case POWER_SUPPLY_PROP_TEMP_MAX: + val->intval = chip->pdata->temp_max; + break; + case POWER_SUPPLY_PROP_HEALTH: + ret = max17042_get_battery_health(chip, &val->intval); + if (ret < 0) + return ret; + break; + case POWER_SUPPLY_PROP_CURRENT_NOW: + if (chip->pdata->enable_current_sense) { + ret = regmap_read(map, MAX17042_Current, &data); + if (ret < 0) + return ret; + + val->intval = data; + if (val->intval & 0x8000) { + /* Negative */ + val->intval = ~val->intval & 0x7fff; + val->intval++; + val->intval *= -1; + } + val->intval *= 1562500 / chip->pdata->r_sns; + } else { + return -EINVAL; + } + break; + case POWER_SUPPLY_PROP_CURRENT_AVG: + if (chip->pdata->enable_current_sense) { + ret = regmap_read(map, MAX17042_AvgCurrent, &data); + if (ret < 0) + return ret; + + val->intval = data; + if (val->intval & 0x8000) { + /* Negative */ + val->intval = ~val->intval & 0x7fff; + val->intval++; + val->intval *= -1; + } + val->intval *= 1562500 / chip->pdata->r_sns; + } else { + return -EINVAL; + } + break; + default: + return -EINVAL; + } + return 0; +} + +static int max17042_set_property(struct power_supply *psy, + enum power_supply_property psp, + const union power_supply_propval *val) +{ + struct max17042_chip *chip = power_supply_get_drvdata(psy); + struct regmap *map = chip->regmap; + int ret = 0; + u32 data; + int8_t temp; + + switch (psp) { + case POWER_SUPPLY_PROP_TEMP_ALERT_MIN: + ret = regmap_read(map, MAX17042_TALRT_Th, &data); + if (ret < 0) + return ret; + + /* Input in deci-centigrade, convert to centigrade */ + temp = val->intval / 10; + /* force min < max */ + if (temp >= (int8_t)(data >> 8)) + temp = (int8_t)(data >> 8) - 1; + /* Write both MAX and MIN ALERT */ + data = (data & 0xff00) + temp; + ret = regmap_write(map, MAX17042_TALRT_Th, data); + break; + case POWER_SUPPLY_PROP_TEMP_ALERT_MAX: + ret = regmap_read(map, MAX17042_TALRT_Th, &data); + if (ret < 0) + return ret; + + /* Input in Deci-Centigrade, convert to centigrade */ + temp = val->intval / 10; + /* force max > min */ + if (temp <= (int8_t)(data & 0xff)) + temp = (int8_t)(data & 0xff) + 1; + /* Write both MAX and MIN ALERT */ + data = (data & 0xff) + (temp << 8); + ret = regmap_write(map, MAX17042_TALRT_Th, data); + break; + default: + ret = -EINVAL; + } + + return ret; +} + +static int max17042_property_is_writeable(struct power_supply *psy, + enum power_supply_property psp) +{ + int ret; + + switch (psp) { + case POWER_SUPPLY_PROP_TEMP_ALERT_MIN: + case POWER_SUPPLY_PROP_TEMP_ALERT_MAX: + ret = 1; + break; + default: + ret = 0; + } + + return ret; +} + +static int max17042_write_verify_reg(struct regmap *map, u8 reg, u32 value) +{ + int retries = 8; + int ret; + u32 read_value; + + do { + ret = regmap_write(map, reg, value); + regmap_read(map, reg, &read_value); + if (read_value != value) { + ret = -EIO; + retries--; + } + } while (retries && read_value != value); + + if (ret < 0) + pr_err("%s: err %d\n", __func__, ret); + + return ret; +} + +static inline void max17042_override_por(struct regmap *map, + u8 reg, u16 value) +{ + if (value) + regmap_write(map, reg, value); +} + +static inline void max10742_unlock_model(struct max17042_chip *chip) +{ + struct regmap *map = chip->regmap; + + regmap_write(map, MAX17042_MLOCKReg1, MODEL_UNLOCK1); + regmap_write(map, MAX17042_MLOCKReg2, MODEL_UNLOCK2); +} + +static inline void max10742_lock_model(struct max17042_chip *chip) +{ + struct regmap *map = chip->regmap; + + regmap_write(map, MAX17042_MLOCKReg1, MODEL_LOCK1); + regmap_write(map, MAX17042_MLOCKReg2, MODEL_LOCK2); +} + +static inline void max17042_write_model_data(struct max17042_chip *chip, + u8 addr, int size) +{ + struct regmap *map = chip->regmap; + int i; + + for (i = 0; i < size; i++) + regmap_write(map, addr + i, + chip->pdata->config_data->cell_char_tbl[i]); +} + +static inline void max17042_read_model_data(struct max17042_chip *chip, + u8 addr, u16 *data, int size) +{ + struct regmap *map = chip->regmap; + int i; + u32 tmp; + + for (i = 0; i < size; i++) { + regmap_read(map, addr + i, &tmp); + data[i] = (u16)tmp; + } +} + +static inline int max17042_model_data_compare(struct max17042_chip *chip, + u16 *data1, u16 *data2, int size) +{ + int i; + + if (memcmp(data1, data2, size)) { + dev_err(&chip->client->dev, "%s compare failed\n", __func__); + for (i = 0; i < size; i++) + dev_info(&chip->client->dev, "0x%x, 0x%x", + data1[i], data2[i]); + dev_info(&chip->client->dev, "\n"); + return -EINVAL; + } + return 0; +} + +static int max17042_init_model(struct max17042_chip *chip) +{ + int ret; + int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl); + u16 *temp_data; + + temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL); + if (!temp_data) + return -ENOMEM; + + max10742_unlock_model(chip); + max17042_write_model_data(chip, MAX17042_MODELChrTbl, + table_size); + max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data, + table_size); + + ret = max17042_model_data_compare( + chip, + chip->pdata->config_data->cell_char_tbl, + temp_data, + table_size); + + max10742_lock_model(chip); + kfree(temp_data); + + return ret; +} + +static int max17042_verify_model_lock(struct max17042_chip *chip) +{ + int i; + int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl); + u16 *temp_data; + int ret = 0; + + temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL); + if (!temp_data) + return -ENOMEM; + + max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data, + table_size); + for (i = 0; i < table_size; i++) + if (temp_data[i]) + ret = -EINVAL; + + kfree(temp_data); + return ret; +} + +static void max17042_write_config_regs(struct max17042_chip *chip) +{ + struct max17042_config_data *config = chip->pdata->config_data; + struct regmap *map = chip->regmap; + + regmap_write(map, MAX17042_CONFIG, config->config); + regmap_write(map, MAX17042_LearnCFG, config->learn_cfg); + regmap_write(map, MAX17042_FilterCFG, + config->filter_cfg); + regmap_write(map, MAX17042_RelaxCFG, config->relax_cfg); + if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047 || + chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050) + regmap_write(map, MAX17047_FullSOCThr, + config->full_soc_thresh); +} + +static void max17042_write_custom_regs(struct max17042_chip *chip) +{ + struct max17042_config_data *config = chip->pdata->config_data; + struct regmap *map = chip->regmap; + + max17042_write_verify_reg(map, MAX17042_RCOMP0, config->rcomp0); + max17042_write_verify_reg(map, MAX17042_TempCo, config->tcompc0); + max17042_write_verify_reg(map, MAX17042_ICHGTerm, config->ichgt_term); + if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) { + regmap_write(map, MAX17042_EmptyTempCo, config->empty_tempco); + max17042_write_verify_reg(map, MAX17042_K_empty0, + config->kempty0); + } else { + max17042_write_verify_reg(map, MAX17047_QRTbl00, + config->qrtbl00); + max17042_write_verify_reg(map, MAX17047_QRTbl10, + config->qrtbl10); + max17042_write_verify_reg(map, MAX17047_QRTbl20, + config->qrtbl20); + max17042_write_verify_reg(map, MAX17047_QRTbl30, + config->qrtbl30); + } +} + +static void max17042_update_capacity_regs(struct max17042_chip *chip) +{ + struct max17042_config_data *config = chip->pdata->config_data; + struct regmap *map = chip->regmap; + + max17042_write_verify_reg(map, MAX17042_FullCAP, + config->fullcap); + regmap_write(map, MAX17042_DesignCap, config->design_cap); + max17042_write_verify_reg(map, MAX17042_FullCAPNom, + config->fullcapnom); +} + +static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip) +{ + unsigned int vfSoc; + struct regmap *map = chip->regmap; + + regmap_read(map, MAX17042_VFSOC, &vfSoc); + regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK); + max17042_write_verify_reg(map, MAX17042_VFSOC0, vfSoc); + regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_LOCK); +} + +static void max17042_load_new_capacity_params(struct max17042_chip *chip) +{ + u32 full_cap0, rep_cap, dq_acc, vfSoc; + u32 rem_cap; + + struct max17042_config_data *config = chip->pdata->config_data; + struct regmap *map = chip->regmap; + + regmap_read(map, MAX17042_FullCAP0, &full_cap0); + regmap_read(map, MAX17042_VFSOC, &vfSoc); + + /* fg_vfSoc needs to shifted by 8 bits to get the + * perc in 1% accuracy, to get the right rem_cap multiply + * full_cap0, fg_vfSoc and devide by 100 + */ + rem_cap = ((vfSoc >> 8) * full_cap0) / 100; + max17042_write_verify_reg(map, MAX17042_RemCap, rem_cap); + + rep_cap = rem_cap; + max17042_write_verify_reg(map, MAX17042_RepCap, rep_cap); + + /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */ + dq_acc = config->fullcap / dQ_ACC_DIV; + max17042_write_verify_reg(map, MAX17042_dQacc, dq_acc); + max17042_write_verify_reg(map, MAX17042_dPacc, dP_ACC_200); + + max17042_write_verify_reg(map, MAX17042_FullCAP, + config->fullcap); + regmap_write(map, MAX17042_DesignCap, + config->design_cap); + max17042_write_verify_reg(map, MAX17042_FullCAPNom, + config->fullcapnom); + /* Update SOC register with new SOC */ + regmap_write(map, MAX17042_RepSOC, vfSoc); +} + +/* + * Block write all the override values coming from platform data. + * This function MUST be called before the POR initialization proceedure + * specified by maxim. + */ +static inline void max17042_override_por_values(struct max17042_chip *chip) +{ + struct regmap *map = chip->regmap; + struct max17042_config_data *config = chip->pdata->config_data; + + max17042_override_por(map, MAX17042_TGAIN, config->tgain); + max17042_override_por(map, MAx17042_TOFF, config->toff); + max17042_override_por(map, MAX17042_CGAIN, config->cgain); + max17042_override_por(map, MAX17042_COFF, config->coff); + + max17042_override_por(map, MAX17042_VALRT_Th, config->valrt_thresh); + max17042_override_por(map, MAX17042_TALRT_Th, config->talrt_thresh); + max17042_override_por(map, MAX17042_SALRT_Th, + config->soc_alrt_thresh); + max17042_override_por(map, MAX17042_CONFIG, config->config); + max17042_override_por(map, MAX17042_SHDNTIMER, config->shdntimer); + + max17042_override_por(map, MAX17042_DesignCap, config->design_cap); + max17042_override_por(map, MAX17042_ICHGTerm, config->ichgt_term); + + max17042_override_por(map, MAX17042_AtRate, config->at_rate); + max17042_override_por(map, MAX17042_LearnCFG, config->learn_cfg); + max17042_override_por(map, MAX17042_FilterCFG, config->filter_cfg); + max17042_override_por(map, MAX17042_RelaxCFG, config->relax_cfg); + max17042_override_por(map, MAX17042_MiscCFG, config->misc_cfg); + max17042_override_por(map, MAX17042_MaskSOC, config->masksoc); + + max17042_override_por(map, MAX17042_FullCAP, config->fullcap); + max17042_override_por(map, MAX17042_FullCAPNom, config->fullcapnom); + if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) + max17042_override_por(map, MAX17042_SOC_empty, + config->socempty); + max17042_override_por(map, MAX17042_LAvg_empty, config->lavg_empty); + max17042_override_por(map, MAX17042_dQacc, config->dqacc); + max17042_override_por(map, MAX17042_dPacc, config->dpacc); + + if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) + max17042_override_por(map, MAX17042_V_empty, config->vempty); + else + max17042_override_por(map, MAX17047_V_empty, config->vempty); + max17042_override_por(map, MAX17042_TempNom, config->temp_nom); + max17042_override_por(map, MAX17042_TempLim, config->temp_lim); + max17042_override_por(map, MAX17042_FCTC, config->fctc); + max17042_override_por(map, MAX17042_RCOMP0, config->rcomp0); + max17042_override_por(map, MAX17042_TempCo, config->tcompc0); + if (chip->chip_type) { + max17042_override_por(map, MAX17042_EmptyTempCo, + config->empty_tempco); + max17042_override_por(map, MAX17042_K_empty0, + config->kempty0); + } +} + +static int max17042_init_chip(struct max17042_chip *chip) +{ + struct regmap *map = chip->regmap; + int ret; + + max17042_override_por_values(chip); + /* After Power up, the MAX17042 requires 500mS in order + * to perform signal debouncing and initial SOC reporting + */ + msleep(500); + + /* Initialize configaration */ + max17042_write_config_regs(chip); + + /* write cell characterization data */ + ret = max17042_init_model(chip); + if (ret) { + dev_err(&chip->client->dev, "%s init failed\n", + __func__); + return -EIO; + } + + ret = max17042_verify_model_lock(chip); + if (ret) { + dev_err(&chip->client->dev, "%s lock verify failed\n", + __func__); + return -EIO; + } + /* write custom parameters */ + max17042_write_custom_regs(chip); + + /* update capacity params */ + max17042_update_capacity_regs(chip); + + /* delay must be atleast 350mS to allow VFSOC + * to be calculated from the new configuration + */ + msleep(350); + + /* reset vfsoc0 reg */ + max17042_reset_vfsoc0_reg(chip); + + /* load new capacity params */ + max17042_load_new_capacity_params(chip); + + /* Init complete, Clear the POR bit */ + regmap_update_bits(map, MAX17042_STATUS, STATUS_POR_BIT, 0x0); + return 0; +} + +static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off) +{ + struct regmap *map = chip->regmap; + u32 soc, soc_tr; + + /* program interrupt thesholds such that we should + * get interrupt for every 'off' perc change in the soc + */ + regmap_read(map, MAX17042_RepSOC, &soc); + soc >>= 8; + soc_tr = (soc + off) << 8; + soc_tr |= (soc - off); + regmap_write(map, MAX17042_SALRT_Th, soc_tr); +} + +static irqreturn_t max17042_thread_handler(int id, void *dev) +{ + struct max17042_chip *chip = dev; + u32 val; + + regmap_read(chip->regmap, MAX17042_STATUS, &val); + if ((val & STATUS_INTR_SOCMIN_BIT) || + (val & STATUS_INTR_SOCMAX_BIT)) { + dev_info(&chip->client->dev, "SOC threshold INTR\n"); + max17042_set_soc_threshold(chip, 1); + } + + power_supply_changed(chip->battery); + return IRQ_HANDLED; +} + +static void max17042_init_worker(struct work_struct *work) +{ + struct max17042_chip *chip = container_of(work, + struct max17042_chip, work); + int ret; + + /* Initialize registers according to values from the platform data */ + if (chip->pdata->enable_por_init && chip->pdata->config_data) { + ret = max17042_init_chip(chip); + if (ret) + return; + } + + chip->init_complete = 1; +} + +#ifdef CONFIG_OF +static struct max17042_platform_data * +max17042_get_pdata(struct device *dev) +{ + struct device_node *np = dev->of_node; + u32 prop; + struct max17042_platform_data *pdata; + + if (!np) + return dev->platform_data; + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return NULL; + + /* + * Require current sense resistor value to be specified for + * current-sense functionality to be enabled at all. + */ + if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) { + pdata->r_sns = prop; + pdata->enable_current_sense = true; + } + + if (of_property_read_s32(np, "maxim,cold-temp", &pdata->temp_min)) + pdata->temp_min = INT_MIN; + if (of_property_read_s32(np, "maxim,over-heat-temp", &pdata->temp_max)) + pdata->temp_max = INT_MAX; + if (of_property_read_s32(np, "maxim,dead-volt", &pdata->vmin)) + pdata->vmin = INT_MIN; + if (of_property_read_s32(np, "maxim,over-volt", &pdata->vmax)) + pdata->vmax = INT_MAX; + + return pdata; +} +#else +static struct max17042_platform_data * +max17042_get_pdata(struct device *dev) +{ + return dev->platform_data; +} +#endif + +static const struct regmap_config max17042_regmap_config = { + .reg_bits = 8, + .val_bits = 16, + .val_format_endian = REGMAP_ENDIAN_NATIVE, +}; + +static const struct power_supply_desc max17042_psy_desc = { + .name = "max170xx_battery", + .type = POWER_SUPPLY_TYPE_BATTERY, + .get_property = max17042_get_property, + .set_property = max17042_set_property, + .property_is_writeable = max17042_property_is_writeable, + .properties = max17042_battery_props, + .num_properties = ARRAY_SIZE(max17042_battery_props), +}; + +static const struct power_supply_desc max17042_no_current_sense_psy_desc = { + .name = "max170xx_battery", + .type = POWER_SUPPLY_TYPE_BATTERY, + .get_property = max17042_get_property, + .set_property = max17042_set_property, + .property_is_writeable = max17042_property_is_writeable, + .properties = max17042_battery_props, + .num_properties = ARRAY_SIZE(max17042_battery_props) - 2, +}; + +static int max17042_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); + const struct power_supply_desc *max17042_desc = &max17042_psy_desc; + struct power_supply_config psy_cfg = {}; + struct max17042_chip *chip; + int ret; + int i; + u32 val; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) + return -EIO; + + chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->client = client; + chip->regmap = devm_regmap_init_i2c(client, &max17042_regmap_config); + if (IS_ERR(chip->regmap)) { + dev_err(&client->dev, "Failed to initialize regmap\n"); + return -EINVAL; + } + + chip->pdata = max17042_get_pdata(&client->dev); + if (!chip->pdata) { + dev_err(&client->dev, "no platform data provided\n"); + return -EINVAL; + } + + i2c_set_clientdata(client, chip); + chip->chip_type = id->driver_data; + psy_cfg.drv_data = chip; + + /* When current is not measured, + * CURRENT_NOW and CURRENT_AVG properties should be invisible. */ + if (!chip->pdata->enable_current_sense) + max17042_desc = &max17042_no_current_sense_psy_desc; + + if (chip->pdata->r_sns == 0) + chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR; + + if (chip->pdata->init_data) + for (i = 0; i < chip->pdata->num_init_data; i++) + regmap_write(chip->regmap, + chip->pdata->init_data[i].addr, + chip->pdata->init_data[i].data); + + if (!chip->pdata->enable_current_sense) { + regmap_write(chip->regmap, MAX17042_CGAIN, 0x0000); + regmap_write(chip->regmap, MAX17042_MiscCFG, 0x0003); + regmap_write(chip->regmap, MAX17042_LearnCFG, 0x0007); + } + + chip->battery = devm_power_supply_register(&client->dev, max17042_desc, + &psy_cfg); + if (IS_ERR(chip->battery)) { + dev_err(&client->dev, "failed: power supply register\n"); + return PTR_ERR(chip->battery); + } + + if (client->irq) { + ret = devm_request_threaded_irq(&client->dev, client->irq, + NULL, + max17042_thread_handler, + IRQF_TRIGGER_FALLING | + IRQF_ONESHOT, + chip->battery->desc->name, + chip); + if (!ret) { + regmap_update_bits(chip->regmap, MAX17042_CONFIG, + CONFIG_ALRT_BIT_ENBL, + CONFIG_ALRT_BIT_ENBL); + max17042_set_soc_threshold(chip, 1); + } else { + client->irq = 0; + dev_err(&client->dev, "%s(): cannot get IRQ\n", + __func__); + } + } + + regmap_read(chip->regmap, MAX17042_STATUS, &val); + if (val & STATUS_POR_BIT) { + INIT_WORK(&chip->work, max17042_init_worker); + schedule_work(&chip->work); + } else { + chip->init_complete = 1; + } + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int max17042_suspend(struct device *dev) +{ + struct max17042_chip *chip = dev_get_drvdata(dev); + + /* + * disable the irq and enable irq_wake + * capability to the interrupt line. + */ + if (chip->client->irq) { + disable_irq(chip->client->irq); + enable_irq_wake(chip->client->irq); + } + + return 0; +} + +static int max17042_resume(struct device *dev) +{ + struct max17042_chip *chip = dev_get_drvdata(dev); + + if (chip->client->irq) { + disable_irq_wake(chip->client->irq); + enable_irq(chip->client->irq); + /* re-program the SOC thresholds to 1% change */ + max17042_set_soc_threshold(chip, 1); + } + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(max17042_pm_ops, max17042_suspend, + max17042_resume); + +#ifdef CONFIG_OF +static const struct of_device_id max17042_dt_match[] = { + { .compatible = "maxim,max17042" }, + { .compatible = "maxim,max17047" }, + { .compatible = "maxim,max17050" }, + { }, +}; +MODULE_DEVICE_TABLE(of, max17042_dt_match); +#endif + +static const struct i2c_device_id max17042_id[] = { + { "max17042", MAXIM_DEVICE_TYPE_MAX17042 }, + { "max17047", MAXIM_DEVICE_TYPE_MAX17047 }, + { "max17050", MAXIM_DEVICE_TYPE_MAX17050 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, max17042_id); + +static struct i2c_driver max17042_i2c_driver = { + .driver = { + .name = "max17042", + .of_match_table = of_match_ptr(max17042_dt_match), + .pm = &max17042_pm_ops, + }, + .probe = max17042_probe, + .id_table = max17042_id, +}; +module_i2c_driver(max17042_i2c_driver); + +MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); +MODULE_DESCRIPTION("MAX17042 Fuel Gauge"); +MODULE_LICENSE("GPL"); |