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Commit 553a776b authored by Daniel Baluta's avatar Daniel Baluta Committed by Jonathan Cameron
Browse files

iio: magnetometer: mmc35240: Add PM sleep support 



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: default avatarDaniel Baluta <daniel.baluta@intel.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent abeb6b1e

drivers/iio/magnetometer/mmc35240.c

+35 −0
Original line number Diff line number Diff line
@@ -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>
@@ -448,6 +449,39 @@ static int mmc35240_probe(struct i2c_client *client, 
	return devm_iio_device_register(&client->dev, indio_dev);

}



#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},

	{}
@@ -457,6 +491,7 @@ MODULE_DEVICE_TABLE(i2c, mmc35240_id); 
static struct i2c_driver mmc35240_driver = {

	.driver = {

		.name = MMC35240_DRV_NAME,

		.pm = &mmc35240_pm_ops,

	},

	.probe		= mmc35240_probe,

	.id_table	= mmc35240_id,