From 040f3e5833b9426aaeead6da8957a9b87f3ca9e8 Mon Sep 17 00:00:00 2001 From: Leed Aguilar Date: Wed, 6 Jun 2012 16:14:56 -0400 Subject: [PATCH] staging:iio:magnetometer:ak8975: set power-down mode after reading fuse ROM data 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 Acked-by: Laxman Dewangan Signed-off-by: Greg Kroah-Hartman --- drivers/staging/iio/magnetometer/ak8975.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/staging/iio/magnetometer/ak8975.c b/drivers/staging/iio/magnetometer/ak8975.c index 7562cafb26bb..001b3bff4765 100644 --- a/drivers/staging/iio/magnetometer/ak8975.c +++ b/drivers/staging/iio/magnetometer/ak8975.c @@ -194,6 +194,17 @@ static int ak8975_setup(struct i2c_client *client) 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 * store in the device data. -- 2.34.1