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iio: magnetometer: mmc35240: Add PM sleep support

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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>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Daniel Baluta 2015-04-24 18:58:31 +03:00 committed by Jonathan Cameron
parent abeb6b1e7b
commit 553a776b79
1 changed files with 35 additions and 0 deletions
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35
drivers/iio/magnetometer/mmc35240.c
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@ -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,