diff options
| author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2012-07-18 10:54:04 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2012-08-15 17:04:42 -0300 |
| commit | 4bbc6d52e61a8a9c19fcc859c4acab89cb8cd4e5 (patch) | |
| tree | 64ce43072ed8fa87bd8f5bc4d8fe5794a0373aef /drivers/media/i2c/soc_camera/tw9910.c | |
| parent | 4ec10bacd6bf08de39ebdba9e75060452cc313e0 (diff) | |
[media] soc-camera: Push probe-time power management to drivers
Several client drivers access the hardware at probe time, for instance
to read the probe chip ID. Such chips need to be powered up when being
probed.
soc-camera handles this by powering chips up in the soc-camera probe
implementation. However, this will break with non soc-camera hosts that
don't perform the same operations.
Fix the problem by pushing the power up/down from the soc-camera core
down to individual drivers on a needs basis.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/i2c/soc_camera/tw9910.c')
| -rw-r--r-- | drivers/media/i2c/soc_camera/tw9910.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/media/i2c/soc_camera/tw9910.c b/drivers/media/i2c/soc_camera/tw9910.c index f28365051878..140716e71a15 100644 --- a/drivers/media/i2c/soc_camera/tw9910.c +++ b/drivers/media/i2c/soc_camera/tw9910.c @@ -780,6 +780,7 @@ static int tw9910_video_probe(struct i2c_client *client) { struct tw9910_priv *priv = to_tw9910(client); s32 id; + int ret; /* * tw9910 only use 8 or 16 bit bus width @@ -790,6 +791,10 @@ static int tw9910_video_probe(struct i2c_client *client) return -ENODEV; } + ret = tw9910_s_power(&priv->subdev, 1); + if (ret < 0) + return ret; + /* * check and show Product ID * So far only revisions 0 and 1 have been seen @@ -803,7 +808,8 @@ static int tw9910_video_probe(struct i2c_client *client) dev_err(&client->dev, "Product ID error %x:%x\n", id, priv->revision); - return -ENODEV; + ret = -ENODEV; + goto done; } dev_info(&client->dev, @@ -811,7 +817,9 @@ static int tw9910_video_probe(struct i2c_client *client) priv->norm = V4L2_STD_NTSC; - return 0; +done: + tw9910_s_power(&priv->subdev, 0); + return ret; } static struct v4l2_subdev_core_ops tw9910_subdev_core_ops = { |