diff options
Diffstat (limited to 'drivers/power/supply')
| -rw-r--r-- | drivers/power/supply/ltc2941-battery-gauge.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/power/supply/ltc2941-battery-gauge.c b/drivers/power/supply/ltc2941-battery-gauge.c index 08e4fd9ee607..4cfa3f0cd689 100644 --- a/drivers/power/supply/ltc2941-battery-gauge.c +++ b/drivers/power/supply/ltc2941-battery-gauge.c @@ -60,6 +60,7 @@ enum ltc294x_id { #define LTC294X_REG_CONTROL_PRESCALER_SET(x) \ ((x << 3) & LTC294X_REG_CONTROL_PRESCALER_MASK) #define LTC294X_REG_CONTROL_ALCC_CONFIG_DISABLED 0 +#define LTC294X_REG_CONTROL_ADC_DISABLE(x) ((x) & ~(BIT(7) | BIT(6))) struct ltc294x_info { struct i2c_client *client; /* I2C Client pointer */ @@ -523,6 +524,29 @@ static int ltc294x_i2c_probe(struct i2c_client *client, return 0; } +static void ltc294x_i2c_shutdown(struct i2c_client *client) +{ + struct ltc294x_info *info = i2c_get_clientdata(client); + int ret; + u8 value; + u8 control; + + /* The LTC2941 does not need any special handling */ + if (info->id == LTC2941_ID) + return; + + /* Read control register */ + ret = ltc294x_read_regs(info->client, LTC294X_REG_CONTROL, &value, 1); + if (ret < 0) + return; + + /* Disable continuous ADC conversion as this drains the battery */ + control = LTC294X_REG_CONTROL_ADC_DISABLE(value); + if (control != value) + ltc294x_write_regs(info->client, LTC294X_REG_CONTROL, + &control, 1); +} + #ifdef CONFIG_PM_SLEEP static int ltc294x_suspend(struct device *dev) @@ -589,6 +613,7 @@ static struct i2c_driver ltc294x_driver = { }, .probe = ltc294x_i2c_probe, .remove = ltc294x_i2c_remove, + .shutdown = ltc294x_i2c_shutdown, .id_table = ltc294x_i2c_id, }; module_i2c_driver(ltc294x_driver); |