diff options
Diffstat (limited to 'drivers/power/supply/max1720x_battery.c')
| -rw-r--r-- | drivers/power/supply/max1720x_battery.c | 126 |
1 files changed, 119 insertions, 7 deletions
diff --git a/drivers/power/supply/max1720x_battery.c b/drivers/power/supply/max1720x_battery.c index 33105419e242..68b5314ecf3a 100644 --- a/drivers/power/supply/max1720x_battery.c +++ b/drivers/power/supply/max1720x_battery.c @@ -16,6 +16,11 @@ #include <linux/unaligned.h> +/* SBS compliant registers */ +#define MAX172XX_TEMP1 0x34 +#define MAX172XX_INT_TEMP 0x35 +#define MAX172XX_TEMP2 0x3B + /* Nonvolatile registers */ #define MAX1720X_NXTABLE0 0x80 #define MAX1720X_NRSENSE 0xCF /* RSense in 10^-5 Ohm */ @@ -24,11 +29,17 @@ /* ModelGauge m5 */ #define MAX172XX_STATUS 0x00 /* Status */ #define MAX172XX_STATUS_BAT_ABSENT BIT(3) /* Battery absent */ +#define MAX172XX_STATUS_IMX BIT(6) /* Maximum Current Alert Threshold Exceeded */ +#define MAX172XX_STATUS_VMN BIT(8) /* Minimum Voltage Alert Threshold Exceeded */ +#define MAX172XX_STATUS_TMN BIT(9) /* Minimum Temperature Alert Threshold Exceeded */ +#define MAX172XX_STATUS_VMX BIT(12) /* Maximum Voltage Alert Threshold Exceeded */ +#define MAX172XX_STATUS_TMX BIT(13) /* Maximum Temperature Alert Threshold Exceeded */ #define MAX172XX_REPCAP 0x05 /* Average capacity */ #define MAX172XX_REPSOC 0x06 /* Percentage of charge */ #define MAX172XX_TEMP 0x08 /* Temperature */ #define MAX172XX_CURRENT 0x0A /* Actual current */ #define MAX172XX_AVG_CURRENT 0x0B /* Average current */ +#define MAX172XX_FULL_CAP 0x10 /* Calculated full capacity */ #define MAX172XX_TTE 0x11 /* Time to empty */ #define MAX172XX_AVG_TA 0x16 /* Average temperature */ #define MAX172XX_CYCLES 0x17 @@ -108,15 +119,19 @@ static const struct regmap_config max1720x_regmap_cfg = { .val_format_endian = REGMAP_ENDIAN_LITTLE, .rd_table = &max1720x_readable_regs, .volatile_table = &max1720x_volatile_regs, - .cache_type = REGCACHE_RBTREE, + .cache_type = REGCACHE_MAPLE, }; static const struct regmap_range max1720x_nvmem_allow[] = { + regmap_reg_range(MAX172XX_TEMP1, MAX172XX_INT_TEMP), + regmap_reg_range(MAX172XX_TEMP2, MAX172XX_TEMP2), regmap_reg_range(MAX1720X_NXTABLE0, MAX1720X_NDEVICE_NAME4), }; static const struct regmap_range max1720x_nvmem_deny[] = { - regmap_reg_range(0x00, 0x7F), + regmap_reg_range(0x00, 0x33), + regmap_reg_range(0x36, 0x3A), + regmap_reg_range(0x3C, 0x7F), regmap_reg_range(0xE0, 0xFF), }; @@ -240,6 +255,7 @@ static const struct nvmem_cell_info max1720x_nvmem_cells[] = { }; static const enum power_supply_property max1720x_battery_props[] = { + POWER_SUPPLY_PROP_HEALTH, POWER_SUPPLY_PROP_PRESENT, POWER_SUPPLY_PROP_CAPACITY, POWER_SUPPLY_PROP_VOLTAGE_NOW, @@ -250,6 +266,7 @@ static const enum power_supply_property max1720x_battery_props[] = { POWER_SUPPLY_PROP_TEMP, POWER_SUPPLY_PROP_CURRENT_NOW, POWER_SUPPLY_PROP_CURRENT_AVG, + POWER_SUPPLY_PROP_CHARGE_FULL, POWER_SUPPLY_PROP_MODEL_NAME, POWER_SUPPLY_PROP_MANUFACTURER, }; @@ -271,9 +288,10 @@ static int max172xx_voltage_to_ps(unsigned int reg) return reg * 1250; /* in uV */ } -static int max172xx_capacity_to_ps(unsigned int reg) +static int max172xx_capacity_to_ps(unsigned int reg, + struct max1720x_device_info *info) { - return reg * 500; /* in uAh */ + return reg * (500000 / info->rsense); /* in uAh */ } /* @@ -291,7 +309,7 @@ static int max172xx_temperature_to_ps(unsigned int reg) /* * Calculating current registers resolution: * - * RSense stored in 10^-5 Ohm, so mesaurment voltage must be + * RSense stored in 10^-5 Ohm, so measurement voltage must be * in 10^-11 Volts for get current in uA. * 16 bit current reg fullscale +/-51.2mV is 102400 uV. * So: 102400 / 65535 * 10^5 = 156252 @@ -303,6 +321,43 @@ static int max172xx_current_to_voltage(unsigned int reg) return val * 156252; } +static int max172xx_battery_health(struct max1720x_device_info *info, + unsigned int *health) +{ + unsigned int status; + int ret; + + ret = regmap_read(info->regmap, MAX172XX_STATUS, &status); + if (ret < 0) + return ret; + + if (status & MAX172XX_STATUS_VMN) + *health = POWER_SUPPLY_HEALTH_DEAD; + else if (status & MAX172XX_STATUS_VMX) + *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; + else if (status & MAX172XX_STATUS_TMN) + *health = POWER_SUPPLY_HEALTH_COLD; + else if (status & MAX172XX_STATUS_TMX) + *health = POWER_SUPPLY_HEALTH_OVERHEAT; + else if (status & MAX172XX_STATUS_IMX) + *health = POWER_SUPPLY_HEALTH_OVERCURRENT; + else + *health = POWER_SUPPLY_HEALTH_GOOD; + + /* Clear events which are not self-clearing to detect next events */ + if (status > 0 && status != MAX172XX_STATUS_IMX) { + ret = regmap_set_bits(info->regmap, MAX172XX_STATUS, + MAX172XX_STATUS_VMN | + MAX172XX_STATUS_VMX | + MAX172XX_STATUS_TMN | + MAX172XX_STATUS_TMX); + if (ret < 0) + return ret; + } + + return 0; +} + static int max1720x_battery_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) @@ -312,6 +367,10 @@ static int max1720x_battery_get_property(struct power_supply *psy, int ret = 0; switch (psp) { + case POWER_SUPPLY_PROP_HEALTH: + ret = max172xx_battery_health(info, ®_val); + val->intval = reg_val; + break; case POWER_SUPPLY_PROP_PRESENT: /* * POWER_SUPPLY_PROP_PRESENT will always readable via @@ -336,11 +395,11 @@ static int max1720x_battery_get_property(struct power_supply *psy, break; case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: ret = regmap_read(info->regmap, MAX172XX_DESIGN_CAP, ®_val); - val->intval = max172xx_capacity_to_ps(reg_val); + val->intval = max172xx_capacity_to_ps(reg_val, info); break; case POWER_SUPPLY_PROP_CHARGE_AVG: ret = regmap_read(info->regmap, MAX172XX_REPCAP, ®_val); - val->intval = max172xx_capacity_to_ps(reg_val); + val->intval = max172xx_capacity_to_ps(reg_val, info); break; case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: ret = regmap_read(info->regmap, MAX172XX_TTE, ®_val); @@ -362,6 +421,10 @@ static int max1720x_battery_get_property(struct power_supply *psy, ret = regmap_read(info->regmap, MAX172XX_AVG_CURRENT, ®_val); val->intval = max172xx_current_to_voltage(reg_val) / info->rsense; break; + case POWER_SUPPLY_PROP_CHARGE_FULL: + ret = regmap_read(info->regmap, MAX172XX_FULL_CAP, ®_val); + val->intval = max172xx_capacity_to_ps(reg_val, info); + break; case POWER_SUPPLY_PROP_MODEL_NAME: ret = regmap_read(info->regmap, MAX172XX_DEV_NAME, ®_val); reg_val = FIELD_GET(MAX172XX_DEV_NAME_TYPE_MASK, reg_val); @@ -382,6 +445,54 @@ static int max1720x_battery_get_property(struct power_supply *psy, return ret; } +static int max1720x_read_temp(struct device *dev, u8 reg, char *buf) +{ + struct power_supply *psy = dev_get_drvdata(dev); + struct max1720x_device_info *info = power_supply_get_drvdata(psy); + unsigned int val; + int ret; + + ret = regmap_read(info->regmap_nv, reg, &val); + if (ret < 0) + return ret; + + /* + * Temperature in degrees Celsius starting at absolute zero, -273C or + * 0K with an LSb of 0.1C + */ + return sysfs_emit(buf, "%d\n", val - 2730); +} + +static ssize_t temp_ain1_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return max1720x_read_temp(dev, MAX172XX_TEMP1, buf); +} + +static ssize_t temp_ain2_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return max1720x_read_temp(dev, MAX172XX_TEMP2, buf); +} + +static ssize_t temp_int_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return max1720x_read_temp(dev, MAX172XX_INT_TEMP, buf); +} + +static DEVICE_ATTR_RO(temp_ain1); +static DEVICE_ATTR_RO(temp_ain2); +static DEVICE_ATTR_RO(temp_int); + +static struct attribute *max1720x_attrs[] = { + &dev_attr_temp_ain1.attr, + &dev_attr_temp_ain2.attr, + &dev_attr_temp_int.attr, + NULL +}; +ATTRIBUTE_GROUPS(max1720x); + static int max1720x_nvmem_reg_read(void *priv, unsigned int off, void *val, size_t len) { @@ -482,6 +593,7 @@ static int max1720x_probe(struct i2c_client *client) psy_cfg.drv_data = info; psy_cfg.fwnode = dev_fwnode(dev); + psy_cfg.attr_grp = max1720x_groups; i2c_set_clientdata(client, info); info->regmap = devm_regmap_init_i2c(client, &max1720x_regmap_cfg); if (IS_ERR(info->regmap)) |