diff options
Diffstat (limited to 'drivers/power')
| -rw-r--r-- | drivers/power/bq27x00_battery.c | 271 |
1 files changed, 150 insertions, 121 deletions
diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c index 44bc76be0780..dbe3fcb3b0ba 100644 --- a/drivers/power/bq27x00_battery.c +++ b/drivers/power/bq27x00_battery.c @@ -51,17 +51,30 @@ struct bq27x00_device_info; struct bq27x00_access_methods { - int (*read)(struct bq27x00_device_info *, u8 reg, int *rt_value, - bool single); + int (*read)(struct bq27x00_device_info *di, u8 reg, bool single); }; enum bq27x00_chip { BQ27000, BQ27500 }; +struct bq27x00_reg_cache { + int temperature; + int time_to_empty; + int time_to_empty_avg; + int time_to_full; + int capacity; + int flags; + + int current_now; +}; + struct bq27x00_device_info { struct device *dev; int id; enum bq27x00_chip chip; + struct bq27x00_reg_cache cache; + unsigned long last_update; + struct power_supply bat; struct bq27x00_access_methods bus; @@ -85,48 +98,93 @@ static enum power_supply_property bq27x00_battery_props[] = { */ static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg, - int *rt_value, bool single) + bool single) { - return di->bus.read(di, reg, rt_value, single); + return di->bus.read(di, reg, single); } /* - * Return the battery temperature in tenths of degree Celsius + * Return the battery Relative State-of-Charge * Or < 0 if something fails. */ -static int bq27x00_battery_temperature(struct bq27x00_device_info *di) +static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di) { - int ret; - int temp = 0; - - ret = bq27x00_read(di, BQ27x00_REG_TEMP, &temp, false); - if (ret) { - dev_err(di->dev, "error reading temperature\n"); - return ret; - } + int rsoc; if (di->chip == BQ27500) - return temp - 2731; + rsoc = bq27x00_read(di, BQ27500_REG_SOC, false); else - return ((temp * 5) - 5463) / 2; + rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true); + + if (rsoc < 0) + dev_err(di->dev, "error reading relative State-of-Charge\n"); + + return rsoc; } /* - * Return the battery Voltage in milivolts - * Or < 0 if something fails. + * Read a time register. + * Return < 0 if something fails. */ -static int bq27x00_battery_voltage(struct bq27x00_device_info *di) +static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg) { - int ret; - int volt = 0; + int tval; - ret = bq27x00_read(di, BQ27x00_REG_VOLT, &volt, false); - if (ret) { - dev_err(di->dev, "error reading voltage\n"); - return ret; + tval = bq27x00_read(di, reg, false); + if (tval < 0) { + dev_err(di->dev, "error reading register %02x: %d\n", reg, tval); + return tval; } - return volt * 1000; + if (tval == 65535) + return -ENODATA; + + return tval * 60; +} + +static void bq27x00_update(struct bq27x00_device_info *di) +{ + struct bq27x00_reg_cache cache = {0, }; + bool is_bq27500 = di->chip == BQ27500; + + cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, is_bq27500); + if (cache.flags >= 0) { + cache.capacity = bq27x00_battery_read_rsoc(di); + cache.temperature = bq27x00_read(di, BQ27x00_REG_TEMP, false); + 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); + + if (!is_bq27500) + cache.current_now = bq27x00_read(di, BQ27x00_REG_AI, false); + } + + /* Ignore current_now which is a snapshot of the current battery state + * and is likely to be different even between two consecutive reads */ + if (memcmp(&di->cache, &cache, sizeof(cache) - sizeof(int)) != 0) { + di->cache = cache; + power_supply_changed(&di->bat); + } + + di->last_update = jiffies; +} + +/* + * Return the battery temperature in tenths of degree Celsius + * Or < 0 if something fails. + */ +static int bq27x00_battery_temperature(struct bq27x00_device_info *di, + union power_supply_propval *val) +{ + if (di->cache.temperature < 0) + return di->cache.temperature; + + if (di->chip == BQ27500) + val->intval = di->cache.temperature - 2731; + else + val->intval = ((di->cache.temperature * 5) - 5463) / 2; + + return 0; } /* @@ -134,109 +192,84 @@ static int bq27x00_battery_voltage(struct bq27x00_device_info *di) * Note that current can be negative signed as well * Or 0 if something fails. */ -static int bq27x00_battery_current(struct bq27x00_device_info *di) +static int bq27x00_battery_current(struct bq27x00_device_info *di, + union power_supply_propval *val) { - int ret; - int curr = 0; - int flags = 0; + int curr; - ret = bq27x00_read(di, BQ27x00_REG_AI, &curr, false); - if (ret) { - dev_err(di->dev, "error reading current\n"); - return 0; - } + if (di->chip == BQ27500) + curr = bq27x00_read(di, BQ27x00_REG_AI, false); + else + curr = di->cache.current_now; + + if (curr < 0) + return curr; if (di->chip == BQ27500) { /* bq27500 returns signed value */ - curr = (int)((s16)curr) * 1000; + val->intval = (int)((s16)curr) * 1000; } else { - ret = bq27x00_read(di, BQ27x00_REG_FLAGS, &flags, false); - if (ret < 0) { - dev_err(di->dev, "error reading flags\n"); - return 0; - } - if (flags & BQ27000_FLAG_CHGS) { + if (di->cache.flags & BQ27000_FLAG_CHGS) { dev_dbg(di->dev, "negative current!\n"); curr = -curr; } - curr = curr * 3570 / BQ27000_RS; - } - - return curr; -} - -/* - * Return the battery Relative State-of-Charge - * Or < 0 if something fails. - */ -static int bq27x00_battery_rsoc(struct bq27x00_device_info *di) -{ - int ret; - int rsoc = 0; - if (di->chip == BQ27500) - ret = bq27x00_read(di, BQ27500_REG_SOC, &rsoc, false); - else - ret = bq27x00_read(di, BQ27000_REG_RSOC, &rsoc, true); - if (ret) { - dev_err(di->dev, "error reading relative State-of-Charge\n"); - return ret; + val->intval = curr * 3570 / BQ27000_RS; } - return rsoc; + return 0; } static int bq27x00_battery_status(struct bq27x00_device_info *di, - union power_supply_propval *val) + union power_supply_propval *val) { - int flags = 0; int status; - int ret; - - ret = bq27x00_read(di, BQ27x00_REG_FLAGS, &flags, false); - if (ret < 0) { - dev_err(di->dev, "error reading flags\n"); - return ret; - } if (di->chip == BQ27500) { - if (flags & BQ27500_FLAG_FC) + if (di->cache.flags & BQ27500_FLAG_FC) status = POWER_SUPPLY_STATUS_FULL; - else if (flags & BQ27500_FLAG_DSC) + else if (di->cache.flags & BQ27500_FLAG_DSC) status = POWER_SUPPLY_STATUS_DISCHARGING; else status = POWER_SUPPLY_STATUS_CHARGING; } else { - if (flags & BQ27000_FLAG_CHGS) + if (di->cache.flags & BQ27000_FLAG_CHGS) status = POWER_SUPPLY_STATUS_CHARGING; else status = POWER_SUPPLY_STATUS_DISCHARGING; } val->intval = status; + return 0; } /* - * Read a time register. - * Return < 0 if something fails. + * Return the battery Voltage in milivolts + * Or < 0 if something fails. */ -static int bq27x00_battery_time(struct bq27x00_device_info *di, int reg, - union power_supply_propval *val) +static int bq27x00_battery_voltage(struct bq27x00_device_info *di, + union power_supply_propval *val) { - int tval = 0; - int ret; + int volt; - ret = bq27x00_read(di, reg, &tval, false); - if (ret) { - dev_err(di->dev, "error reading register %02x\n", reg); - return ret; - } + volt = bq27x00_read(di, BQ27x00_REG_VOLT, false); + if (volt < 0) + return volt; - if (tval == 65535) - return -ENODATA; + val->intval = volt * 1000; + + return 0; +} + +static int bq27x00_simple_value(int value, + union power_supply_propval *val) +{ + if (value < 0) + return value; + + val->intval = value; - val->intval = tval * 60; return 0; } @@ -249,9 +282,11 @@ static int bq27x00_battery_get_property(struct power_supply *psy, { int ret = 0; struct bq27x00_device_info *di = to_bq27x00_device_info(psy); - int voltage = bq27x00_battery_voltage(di); - if (psp != POWER_SUPPLY_PROP_PRESENT && voltage <= 0) + if (time_is_before_jiffies(di->last_update + 5 * HZ)) + bq27x00_update(di); + + if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0) return -ENODEV; switch (psp) { @@ -259,29 +294,28 @@ static int bq27x00_battery_get_property(struct power_supply *psy, ret = bq27x00_battery_status(di, val); break; case POWER_SUPPLY_PROP_VOLTAGE_NOW: - val->intval = voltage; + ret = bq27x00_battery_voltage(di, val); break; case POWER_SUPPLY_PROP_PRESENT: - if (psp == POWER_SUPPLY_PROP_PRESENT) - val->intval = voltage <= 0 ? 0 : 1; + val->intval = di->cache.flags < 0 ? 0 : 1; break; case POWER_SUPPLY_PROP_CURRENT_NOW: - val->intval = bq27x00_battery_current(di); + ret = bq27x00_battery_current(di, val); break; case POWER_SUPPLY_PROP_CAPACITY: - val->intval = bq27x00_battery_rsoc(di); + ret = bq27x00_simple_value(di->cache.capacity, val); break; case POWER_SUPPLY_PROP_TEMP: - val->intval = bq27x00_battery_temperature(di); + ret = bq27x00_battery_temperature(di, val); break; case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: - ret = bq27x00_battery_time(di, BQ27x00_REG_TTE, val); + ret = bq27x00_simple_value(di->cache.time_to_empty, val); break; case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: - ret = bq27x00_battery_time(di, BQ27x00_REG_TTECP, val); + ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val); break; case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW: - ret = bq27x00_battery_time(di, BQ27x00_REG_TTF, val); + ret = bq27x00_simple_value(di->cache.time_to_full, val); break; case POWER_SUPPLY_PROP_TECHNOLOGY: val->intval = POWER_SUPPLY_TECHNOLOGY_LION; @@ -311,6 +345,8 @@ static int bq27x00_powersupply_init(struct bq27x00_device_info *di) dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION); + bq27x00_update(di); + return 0; } @@ -324,13 +360,12 @@ static int bq27x00_powersupply_init(struct bq27x00_device_info *di) static DEFINE_IDR(battery_id); static DEFINE_MUTEX(battery_mutex); -static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, - int *rt_value, bool single) +static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single) { struct i2c_client *client = to_i2c_client(di->dev); struct i2c_msg msg[1]; unsigned char data[2]; - int err; + int ret; if (!client->adapter) return -ENODEV; @@ -341,26 +376,24 @@ static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, msg->buf = data; data[0] = reg; - err = i2c_transfer(client->adapter, msg, 1); + ret = i2c_transfer(client->adapter, msg, 1); - if (err >= 0) { + if (ret >= 0) { if (!single) msg->len = 2; else msg->len = 1; msg->flags = I2C_M_RD; - err = i2c_transfer(client->adapter, msg, 1); - if (err >= 0) { + ret = i2c_transfer(client->adapter, msg, 1); + if (ret >= 0) { if (!single) - *rt_value = get_unaligned_le16(data); + ret = get_unaligned_le16(data); else - *rt_value = data[0]; - - return 0; + ret = data[0]; } } - return err; + return ret; } static int bq27x00_battery_probe(struct i2c_client *client, @@ -477,7 +510,7 @@ static inline void bq27x00_battery_i2c_exit(void) {}; #ifdef CONFIG_BATTERY_BQ27X00_PLATFORM static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg, - int *rt_value, bool single) + bool single) { struct device *dev = di->dev; struct bq27000_platform_data *pdata = dev->platform_data; @@ -504,14 +537,10 @@ static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg, if (timeout == 0) return -EIO; - *rt_value = (upper << 8) | lower; - } else { - lower = pdata->read(dev, reg); - if (lower < 0) - return lower; - *rt_value = lower; + return (upper << 8) | lower; } - return 0; + + return pdata->read(dev, reg); } static int __devinit bq27000_battery_probe(struct platform_device *pdev) |