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Subject[PATCH 2/3] iio: magnetometer: mmc35240: Add PM sleep support
Date
We rely on regmap to save the state of the registers at suspend,
and then we do an explicit sync at resume.

Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
---
drivers/iio/magnetometer/mmc35240.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)

diff --git a/drivers/iio/magnetometer/mmc35240.c b/drivers/iio/magnetometer/mmc35240.c
index c46c1f7..4c76938 100644
--- a/drivers/iio/magnetometer/mmc35240.c
+++ b/drivers/iio/magnetometer/mmc35240.c
@@ -17,6 +17,7 @@
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/regmap.h>
+#include <linux/pm.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
@@ -454,6 +455,39 @@ static int mmc35240_remove(struct i2c_client *client)
return 0;
}

+#ifdef CONFIG_PM_SLEEP
+static int mmc35240_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct mmc35240_data *data = iio_priv(indio_dev);
+
+ regcache_cache_only(data->regmap, true);
+
+ return 0;
+}
+
+static int mmc35240_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct mmc35240_data *data = iio_priv(indio_dev);
+ int ret;
+
+ regcache_mark_dirty(data->regmap);
+ ret = regcache_sync_region(data->regmap, MMC35240_REG_CTRL0,
+ MMC35240_REG_CTRL1);
+ if (ret < 0)
+ dev_err(dev, "Failed to restore control registers\n");
+
+ regcache_cache_only(data->regmap, false);
+
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops mmc35240_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(mmc35240_suspend, mmc35240_resume)
+};
+
static const struct i2c_device_id mmc35240_id[] = {
{"MMC35240", 0},
{}
@@ -463,6 +497,7 @@ MODULE_DEVICE_TABLE(i2c, mmc35240_id);
static struct i2c_driver mmc35240_driver = {
.driver = {
.name = MMC35240_DRV_NAME,
+ .pm = &mmc35240_pm_ops,
},
.probe = mmc35240_probe,
.remove = mmc35240_remove,
--
1.9.1


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