diff options
Diffstat (limited to 'drivers/power/gta01_battery.c')
| -rw-r--r-- | drivers/power/gta01_battery.c | 54 |
1 files changed, 49 insertions, 5 deletions
diff --git a/drivers/power/gta01_battery.c b/drivers/power/gta01_battery.c index 5b1a6c9b966..3c7c49777b0 100644 --- a/drivers/power/gta01_battery.c +++ b/drivers/power/gta01_battery.c @@ -23,8 +23,35 @@ static enum power_supply_property gta01_bat_props[] = { POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_VOLTAGE_NOW, POWER_SUPPLY_PROP_CURRENT_NOW, + POWER_SUPPLY_PROP_CAPACITY, }; +static int gta01_bat_voltscale(int volt) +{ + /* This table is suggested by SpeedEvil based on analysis of + * experimental data */ + static const int lut[][2] = { + { 4120, 100 }, + { 3900, 60 }, + { 3740, 25 }, + { 3600, 5 }, + { 3000, 0 } }; + int i, res = 0; + + if (volt > lut[0][0]) + res = lut[0][1]; + else + for (i = 0; lut[i][1]; i++) { + if (volt <= lut[i][0] && volt >= lut[i+1][0]) { + res = lut[i][1] - (lut[i][0]-volt)* + (lut[i][1]-lut[i+1][1])/ + (lut[i][0]-lut[i+1][0]); + break; + } + } + return res; +} + static int gta01_bat_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) @@ -33,20 +60,37 @@ static int gta01_bat_get_property(struct power_supply *psy, switch(psp) { case POWER_SUPPLY_PROP_STATUS: - if (bat->pdata->get_charging_status()) - val->intval = POWER_SUPPLY_STATUS_CHARGING; + if (bat->pdata->get_charging_status) + if (bat->pdata->get_charging_status()) + val->intval = POWER_SUPPLY_STATUS_CHARGING; + else + val->intval = POWER_SUPPLY_STATUS_DISCHARGING; else - val->intval = POWER_SUPPLY_STATUS_DISCHARGING; + val->intval = POWER_SUPPLY_STATUS_UNKNOWN; break; case POWER_SUPPLY_PROP_VOLTAGE_NOW: - val->intval = bat->pdata->get_voltage(); + if (bat->pdata->get_voltage) + val->intval = bat->pdata->get_voltage(); + else + val->intval = 0; break; case POWER_SUPPLY_PROP_CURRENT_NOW: - val->intval = bat->pdata->get_current(); + if (bat->pdata->get_current) + val->intval = bat->pdata->get_current(); + else + val->intval = 0; break; case POWER_SUPPLY_PROP_PRESENT: val->intval = 1; /* You must never run GTA01 without battery. */ break; + case POWER_SUPPLY_PROP_CAPACITY: + if (bat->pdata->get_voltage) + val->intval = gta01_bat_voltscale( + bat->pdata->get_voltage()/1000); + else + val->intval = 0; + break; + default: return -EINVAL; } |