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| author | Daniel Baluta <daniel.baluta@intel.com> | 2015-04-24 18:58:31 +0300 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2015-05-10 20:31:45 +0100 |
| commit | 553a776b790816161cd334647eae2093fd126e36 (patch) | |
| tree | 66fa5fff8e4c6d6df673de01faff1865fa8b41b8 | |
| parent | abeb6b1e7bbffb3dbcd918827673feafecc378d1 (diff) | |
| download | linux-553a776b790816161cd334647eae2093fd126e36.tar.gz linux-553a776b790816161cd334647eae2093fd126e36.tar.bz2 linux-553a776b790816161cd334647eae2093fd126e36.zip | |
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: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
| -rw-r--r-- | drivers/iio/magnetometer/mmc35240.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/iio/magnetometer/mmc35240.c b/drivers/iio/magnetometer/mmc35240.c index 46728006bbdb..0c7d64c41575 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> @@ -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, |