diff options
| author | NeilBrown <neilb@suse.de> | 2015-02-24 05:24:41 +0300 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2015-03-09 17:54:42 +0300 |
| commit | 60d3e3bbd5992bb4478f9f99a4e4c5748a1a1ba7 (patch) | |
| tree | 44327c9e057a82b0001722f5d9eeca3885757b88 | |
| parent | d1bd4867b0959d5221dc528ccf60c8534aae865d (diff) | |
| download | linux-60d3e3bbd5992bb4478f9f99a4e4c5748a1a1ba7.tar.xz | |
iio: gyro: itg3200: add suspend/resume support.
Unless we put the device to sleep when not it use, it wastes
6mA.
If the device is asleep on probe, the 'id' register
sometimes mis-reads - so reset first. If the device responds
at all a command sent to the address, it is almost certainly
the correct device already.
Acked-by: Manuel Stahl <manuel.stahl@iis.fraunhofer.de>
Acked-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: NeilBrown <neil@brown.name>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
| -rw-r--r-- | drivers/iio/gyro/itg3200_core.c | 29 |
1 files changed, 25 insertions, 4 deletions
diff --git a/drivers/iio/gyro/itg3200_core.c b/drivers/iio/gyro/itg3200_core.c index 6a8020d48140..f0fd94055d88 100644 --- a/drivers/iio/gyro/itg3200_core.c +++ b/drivers/iio/gyro/itg3200_core.c @@ -223,6 +223,10 @@ static int itg3200_initial_setup(struct iio_dev *indio_dev) int ret; u8 val; + ret = itg3200_reset(indio_dev); + if (ret) + goto err_ret; + ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_ADDRESS, &val); if (ret) goto err_ret; @@ -233,10 +237,6 @@ static int itg3200_initial_setup(struct iio_dev *indio_dev) goto err_ret; } - ret = itg3200_reset(indio_dev); - if (ret) - goto err_ret; - ret = itg3200_enable_full_scale(indio_dev); err_ret: return ret; @@ -351,6 +351,26 @@ static int itg3200_remove(struct i2c_client *client) return 0; } +static int __maybe_unused itg3200_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct itg3200 *st = iio_priv(indio_dev); + + dev_dbg(&st->i2c->dev, "suspend device"); + + return itg3200_write_reg_8(indio_dev, ITG3200_REG_POWER_MANAGEMENT, + ITG3200_SLEEP); +} + +static int __maybe_unused itg3200_resume(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + + return itg3200_initial_setup(indio_dev); +} + +static SIMPLE_DEV_PM_OPS(itg3200_pm_ops, itg3200_suspend, itg3200_resume); + static const struct i2c_device_id itg3200_id[] = { { "itg3200", 0 }, { } @@ -361,6 +381,7 @@ static struct i2c_driver itg3200_driver = { .driver = { .owner = THIS_MODULE, .name = "itg3200", + .pm = &itg3200_pm_ops, }, .id_table = itg3200_id, .probe = itg3200_probe, |