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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>
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parent
d1bd4867b0
commit
60d3e3bbd5
1 changed files with 25 additions and 4 deletions
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@ -223,6 +223,10 @@ static int itg3200_initial_setup(struct iio_dev *indio_dev)
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int ret;
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u8 val;
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ret = itg3200_reset(indio_dev);
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if (ret)
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goto err_ret;
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ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_ADDRESS, &val);
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if (ret)
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goto err_ret;
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@ -233,10 +237,6 @@ static int itg3200_initial_setup(struct iio_dev *indio_dev)
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goto err_ret;
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}
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ret = itg3200_reset(indio_dev);
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if (ret)
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goto err_ret;
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ret = itg3200_enable_full_scale(indio_dev);
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err_ret:
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return ret;
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@ -351,6 +351,26 @@ static int itg3200_remove(struct i2c_client *client)
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return 0;
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}
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static int __maybe_unused itg3200_suspend(struct device *dev)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct itg3200 *st = iio_priv(indio_dev);
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dev_dbg(&st->i2c->dev, "suspend device");
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return itg3200_write_reg_8(indio_dev, ITG3200_REG_POWER_MANAGEMENT,
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ITG3200_SLEEP);
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}
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static int __maybe_unused itg3200_resume(struct device *dev)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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return itg3200_initial_setup(indio_dev);
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}
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static SIMPLE_DEV_PM_OPS(itg3200_pm_ops, itg3200_suspend, itg3200_resume);
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static const struct i2c_device_id itg3200_id[] = {
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{ "itg3200", 0 },
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{ }
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@ -361,6 +381,7 @@ static struct i2c_driver itg3200_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "itg3200",
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.pm = &itg3200_pm_ops,
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},
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.id_table = itg3200_id,
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.probe = itg3200_probe,
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