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staging:iio:magnetometer:ak8975: set power-down mode after reading fuse ROM data

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Fuse ROM data access mode is the only mode which does not
transition to power-down mode automatically.

As per the AK8975 data sheet, it is recomended to set the
power-down mode first before attempting to change into
another mode.

Signed-off-by: Leed Aguilar <leed.aguilar@ti.com>
Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Leed Aguilar 2012-06-06 16:14:56 -04:00 committed by Greg Kroah-Hartman
parent 74dcd439bf
commit 040f3e5833
1 changed files with 11 additions and 0 deletions
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11
drivers/staging/iio/magnetometer/ak8975.c
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@ -194,6 +194,17 @@ static int ak8975_setup(struct i2c_client *client)
return ret; return ret;
} }
/* After reading fuse ROM data set power-down mode */
ret = ak8975_write_data(client,
AK8975_REG_CNTL,
AK8975_REG_CNTL_MODE_POWER_DOWN,
AK8975_REG_CNTL_MODE_MASK,
AK8975_REG_CNTL_MODE_SHIFT);
if (ret < 0) {
dev_err(&client->dev, "Error in setting power-down mode\n");
return ret;
}
/* /*
* Precalculate scale factor (in Gauss units) for each axis and * Precalculate scale factor (in Gauss units) for each axis and
* store in the device data. * store in the device data.