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power: ltc2941-battery-gauge: Disable continuous monitoring on shutdown

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The driver sets the fuel gauge to continuous monitoring on startup, for
the models that support this. When the board shuts down, the chip remains
in that mode, causing a few mA drain on the battery every 2 or 10 seconds.

This patch registers a shutdown handler that turns off the monitoring to
prevent this battery drain.

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
This commit is contained in:
Mike Looijmans 2017-11-23 15:41:05 +01:00 committed by Sebastian Reichel
parent 68204f2fba
commit 5f2f0d6105
1 changed files with 25 additions and 0 deletions
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25
drivers/power/supply/ltc2941-battery-gauge.c
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@ -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);