diff options
Diffstat (limited to 'drivers/power')
| -rw-r--r-- | drivers/power/bq27x00_battery.c | 152 |
1 files changed, 151 insertions, 1 deletions
diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c index 25350fc..a1bd1ff 100644 --- a/drivers/power/bq27x00_battery.c +++ b/drivers/power/bq27x00_battery.c @@ -16,6 +16,13 @@ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. * */ + +/* + * Datasheets: + * http://focus.ti.com/docs/prod/folders/print/bq27000.html + * http://focus.ti.com/docs/prod/folders/print/bq27500.html + */ + #include <linux/module.h> #include <linux/param.h> #include <linux/jiffies.h> @@ -30,7 +37,7 @@ #include <linux/power/bq27x00_battery.h> -#define DRIVER_VERSION "1.1.0" +#define DRIVER_VERSION "1.2.0" #define BQ27x00_REG_TEMP 0x06 #define BQ27x00_REG_VOLT 0x08 @@ -39,11 +46,17 @@ #define BQ27x00_REG_TTE 0x16 #define BQ27x00_REG_TTF 0x18 #define BQ27x00_REG_TTECP 0x26 +#define BQ27x00_REG_NAC 0x0C /* Nominal available capaciy */ +#define BQ27x00_REG_LMD 0x12 /* Last measured discharge */ +#define BQ27x00_REG_CYCT 0x2A /* Cycle count total */ +#define BQ27x00_REG_AE 0x22 /* Available enery */ #define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */ +#define BQ27000_REG_ILMD 0x76 /* Initial last measured discharge */ #define BQ27000_FLAG_CHGS BIT(7) #define BQ27500_REG_SOC 0x2c +#define BQ27500_REG_DCAP 0x3C /* Design capacity */ #define BQ27500_FLAG_DSC BIT(0) #define BQ27500_FLAG_FC BIT(9) @@ -61,6 +74,8 @@ struct bq27x00_reg_cache { int time_to_empty; int time_to_empty_avg; int time_to_full; + int charge_full; + int charge_counter; int capacity; int flags; @@ -73,6 +88,8 @@ struct bq27x00_device_info { enum bq27x00_chip chip; struct bq27x00_reg_cache cache; + int charge_design_full; + unsigned long last_update; struct delayed_work work; @@ -94,6 +111,11 @@ static enum power_supply_property bq27x00_battery_props[] = { POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, POWER_SUPPLY_PROP_TIME_TO_FULL_NOW, POWER_SUPPLY_PROP_TECHNOLOGY, + POWER_SUPPLY_PROP_CHARGE_FULL, + POWER_SUPPLY_PROP_CHARGE_NOW, + POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, + POWER_SUPPLY_PROP_CHARGE_COUNTER, + POWER_SUPPLY_PROP_ENERGY_NOW, }; static unsigned int poll_interval = 360; @@ -131,6 +153,87 @@ static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di) } /* + * Return a battery charge value in µAh + * Or < 0 if something fails. + */ +static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg) +{ + int charge; + + charge = bq27x00_read(di, reg, false); + if (charge < 0) { + dev_err(di->dev, "error reading nominal available capacity\n"); + return charge; + } + + if (di->chip == BQ27500) + charge *= 1000; + else + charge = charge * 3570 / BQ27000_RS; + + return charge; +} + +/* + * Return the battery Nominal available capaciy in µAh + * Or < 0 if something fails. + */ +static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di) +{ + return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC); +} + +/* + * Return the battery Last measured discharge in µAh + * Or < 0 if something fails. + */ +static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di) +{ + return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD); +} + +/* + * Return the battery Initial last measured discharge in µAh + * Or < 0 if something fails. + */ +static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di) +{ + int ilmd; + + if (di->chip == BQ27500) + ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false); + else + ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true); + + if (ilmd < 0) { + dev_err(di->dev, "error reading initial last measured discharge\n"); + return ilmd; + } + + if (di->chip == BQ27500) + ilmd *= 1000; + else + ilmd = ilmd * 256 * 3570 / BQ27000_RS; + + return ilmd; +} + +/* + * Return the battery Cycle count total + * Or < 0 if something fails. + */ +static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di) +{ + int cyct; + + cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false); + if (cyct < 0) + dev_err(di->dev, "error reading cycle count total\n"); + + return cyct; +} + +/* * Read a time register. * Return < 0 if something fails. */ @@ -162,9 +265,15 @@ static void bq27x00_update(struct bq27x00_device_info *di) cache.time_to_empty = bq27x00_battery_read_time(di, BQ27x00_REG_TTE); cache.time_to_empty_avg = bq27x00_battery_read_time(di, BQ27x00_REG_TTECP); cache.time_to_full = bq27x00_battery_read_time(di, BQ27x00_REG_TTF); + cache.charge_full = bq27x00_battery_read_lmd(di); + cache.charge_counter = bq27x00_battery_read_cyct(di); if (!is_bq27500) cache.current_now = bq27x00_read(di, BQ27x00_REG_AI, false); + + /* We only have to read charge design full once */ + if (di->charge_design_full <= 0) + di->charge_design_full = bq27x00_battery_read_ilmd(di); } /* Ignore current_now which is a snapshot of the current battery state @@ -285,6 +394,32 @@ static int bq27x00_battery_voltage(struct bq27x00_device_info *di, return 0; } +/* + * Return the battery Available energy in µWh + * Or < 0 if something fails. + */ +static int bq27x00_battery_energy(struct bq27x00_device_info *di, + union power_supply_propval *val) +{ + int ae; + + ae = bq27x00_read(di, BQ27x00_REG_AE, false); + if (ae < 0) { + dev_err(di->dev, "error reading available energy\n"); + return ae; + } + + if (di->chip == BQ27500) + ae *= 1000; + else + ae = ae * 29200 / BQ27000_RS; + + val->intval = ae; + + return 0; +} + + static int bq27x00_simple_value(int value, union power_supply_propval *val) { @@ -347,6 +482,21 @@ static int bq27x00_battery_get_property(struct power_supply *psy, case POWER_SUPPLY_PROP_TECHNOLOGY: val->intval = POWER_SUPPLY_TECHNOLOGY_LION; break; + case POWER_SUPPLY_PROP_CHARGE_NOW: + ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val); + break; + case POWER_SUPPLY_PROP_CHARGE_FULL: + ret = bq27x00_simple_value(di->cache.charge_full, val); + break; + case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: + ret = bq27x00_simple_value(di->charge_design_full, val); + break; + case POWER_SUPPLY_PROP_CHARGE_COUNTER: + ret = bq27x00_simple_value(di->cache.charge_counter, val); + break; + case POWER_SUPPLY_PROP_ENERGY_NOW: + ret = bq27x00_battery_energy(di, val); + break; default: return -EINVAL; } |
