diff options
| author | David Heidelberg <david@ixit.cz> | 2020-02-11 22:11:59 +0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2020-03-08 20:28:34 +0300 |
| commit | c39a05e35263a2c8abea81df40b42aef33d1a759 (patch) | |
| tree | 6dee9ca585ffd6395ac1fd59f4703199904abdab /drivers/iio/light/al3320a.c | |
| parent | c36b5195ab7035cc7ee0b79f621a3a9ecd71cf9c (diff) | |
| download | linux-c39a05e35263a2c8abea81df40b42aef33d1a759.tar.xz | |
iio: light: al3320a implement suspend support
AL3320a is fairly simple chip, so for suspend is enough to disable and
later enable it again.
Signed-off-by: David Heidelberg <david@ixit.cz>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/light/al3320a.c')
| -rw-r--r-- | drivers/iio/light/al3320a.c | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/drivers/iio/light/al3320a.c b/drivers/iio/light/al3320a.c index cd3e25dd8153..2659a352b55e 100644 --- a/drivers/iio/light/al3320a.c +++ b/drivers/iio/light/al3320a.c @@ -7,6 +7,9 @@ * IIO driver for AL3320A (7-bit I2C slave address 0x1C). * * TODO: interrupt support, thresholds + * When the driver will get support for interrupt handling, then interrupt + * will need to be disabled before turning sensor OFF in order to avoid + * potential races with the interrupt handling. */ #include <linux/bitfield.h> @@ -78,13 +81,18 @@ static const struct attribute_group al3320a_attribute_group = { .attrs = al3320a_attributes, }; +static int al3320a_set_pwr(struct i2c_client *client, bool pwr) +{ + u8 val = pwr ? AL3320A_CONFIG_ENABLE : AL3320A_CONFIG_DISABLE; + return i2c_smbus_write_byte_data(client, AL3320A_REG_CONFIG, val); +} + static int al3320a_init(struct al3320a_data *data) { int ret; - /* power on */ - ret = i2c_smbus_write_byte_data(data->client, AL3320A_REG_CONFIG, - AL3320A_CONFIG_ENABLE); + ret = al3320a_set_pwr(data->client, true); + if (ret < 0) return ret; @@ -203,10 +211,21 @@ static int al3320a_probe(struct i2c_client *client, static int al3320a_remove(struct i2c_client *client) { - return i2c_smbus_write_byte_data(client, AL3320A_REG_CONFIG, - AL3320A_CONFIG_DISABLE); + return al3320a_set_pwr(client, false); } +static int __maybe_unused al3320a_suspend(struct device *dev) +{ + return al3320a_set_pwr(to_i2c_client(dev), false); +} + +static int __maybe_unused al3320a_resume(struct device *dev) +{ + return al3320a_set_pwr(to_i2c_client(dev), true); +} + +static SIMPLE_DEV_PM_OPS(al3320a_pm_ops, al3320a_suspend, al3320a_resume); + static const struct i2c_device_id al3320a_id[] = { {"al3320a", 0}, {} @@ -216,6 +235,7 @@ MODULE_DEVICE_TABLE(i2c, al3320a_id); static struct i2c_driver al3320a_driver = { .driver = { .name = AL3320A_DRV_NAME, + .pm = &al3320a_pm_ops, }, .probe = al3320a_probe, .remove = al3320a_remove, |