From: Leed Aguilar <leed.aguilar@ti.com>
Date: Wed, 6 Jun 2012 20:14:56 +0000 (-0400)
Subject: staging:iio:magnetometer:ak8975: set power-down mode after reading fuse ROM data
X-Git-Tag: next-20120724~21^2~897
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=040f3e5833b9426aaeead6da8957a9b87f3ca9e8;p=karo-tx-linux.git

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 <leed.aguilar@ti.com>
Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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.