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iio: imu: kmx61: Add PM sleep support 

Per sensor state (ACTIVE/STANDBY) is saved in driver's
private data (acc_stby/mag_stby) and restored when
resume is called.

Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Daniel Baluta 2014-12-03 15:31:51 +02:00 committed by Jonathan Cameron
parent aff8609add
commit 3b9c40e604
1 changed files with 29 additions and 0 deletions
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29
drivers/iio/imu/kmx61.c
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@ -16,6 +16,7 @@
#include <linux/acpi.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
@ -796,6 +797,33 @@ static int kmx61_remove(struct i2c_client *client)
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int kmx61_suspend(struct device *dev)
{
int ret;
struct kmx61_data *data = i2c_get_clientdata(to_i2c_client(dev));
mutex_lock(&data->lock);
ret = kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG,
false);
mutex_unlock(&data->lock);
return ret;
}
static int kmx61_resume(struct device *dev)
{
u8 stby = 0;
struct kmx61_data *data = i2c_get_clientdata(to_i2c_client(dev));
if (data->acc_stby)
stby |= KMX61_ACC_STBY_BIT;
if (data->mag_stby)
stby |= KMX61_MAG_STBY_BIT;
return kmx61_set_mode(data, stby, KMX61_ACC | KMX61_MAG, true);
}
#endif
#ifdef CONFIG_PM_RUNTIME
static int kmx61_runtime_suspend(struct device *dev)
@ -825,6 +853,7 @@ static int kmx61_runtime_resume(struct device *dev)
#endif
static const struct dev_pm_ops kmx61_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(kmx61_suspend, kmx61_resume)
SET_RUNTIME_PM_OPS(kmx61_runtime_suspend, kmx61_runtime_resume, NULL)
};