From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Daniel Baluta To: jic23@kernel.org, pmeerw@pmeerw.net Cc: knaack.h@gmx.de, lars@metafoo.de, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org, daniel.baluta@intel.com Subject: [PATCH v2 2/3] iio: magnetometer: mmc35240: Add PM sleep support Date: Fri, 24 Apr 2015 18:58:31 +0300 Message-Id: <1429891112-11888-3-git-send-email-daniel.baluta@intel.com> In-Reply-To: <1429891112-11888-1-git-send-email-daniel.baluta@intel.com> References: <1429891112-11888-1-git-send-email-daniel.baluta@intel.com> List-ID: 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 --- 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 beefebc..7a52c3e 100644 --- a/drivers/iio/magnetometer/mmc35240.c +++ b/drivers/iio/magnetometer/mmc35240.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include @@ -447,6 +448,39 @@ 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}, {} @@ -456,6 +490,7 @@ 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, -- 1.9.1