[PATCH v4 4/6] iio: imu: kmx61: Add PM sleep support

Daniel Baluta
2014-12-03T13:31:51Z

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>
---
drivers/iio/imu/kmx61.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)

diff --git a/drivers/iio/imu/kmx61.c b/drivers/iio/imu/kmx61.c
index 7536043..f69ae5a7 100644
--- a/drivers/iio/imu/kmx61.c
+++ b/drivers/iio/imu/kmx61.c
@@ -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)
};

--
1.9.1