On 15/04/15 12:02, Daniel Baluta wrote:
> 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@xxxxxxxxx>
This looks fine to me.
> ---
> 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,
>
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