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iio: light: al3320a implement suspend support

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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>
This commit is contained in:
David Heidelberg 2020-02-11 20:11:59 +01:00 committed by Jonathan Cameron
parent c36b5195ab
commit c39a05e352
1 changed files with 25 additions and 5 deletions
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30
drivers/iio/light/al3320a.c
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@ -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,