[media] V4L: soc-camera: call subdevice .s_power() method, when powering up or down

Currently soc-camera can use power regulators and platform specific
methods to power clients up and down. Additionally, client drivers can
provide their own subdevice .s_power() methods, acting directly on the
device. This patch adds calls to this method, when external power
supplies are on.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/soc_camera.c b/drivers/media/video/soc_camera.c
index d3eeb08..9a62ed0 100644 (file)
--- a/drivers/media/video/soc_camera.c
+++ b/drivers/media/video/soc_camera.c
@@ -53,10 +53,9 @@ static DEFINE_MUTEX(list_lock);              /* Protects the list of hosts */
 static int soc_camera_power_on(struct soc_camera_device *icd,
                               struct soc_camera_link *icl)
 {
-       int ret;
-
-       ret = regulator_bulk_enable(icl->num_regulators,
-                                   icl->regulators);
+       struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
+       int ret = regulator_bulk_enable(icl->num_regulators,
+                                       icl->regulators);
        if (ret < 0) {
                dev_err(icd->pdev, "Cannot enable regulators\n");
                return ret;
@@ -67,19 +66,33 @@ static int soc_camera_power_on(struct soc_camera_device *icd,
                if (ret < 0) {
                        dev_err(icd->pdev,
                                "Platform failed to power-on the camera.\n");
-
-                       regulator_bulk_disable(icl->num_regulators,
-                                              icl->regulators);
+                       goto elinkpwr;
                }
        }
 
+       ret = v4l2_subdev_call(sd, core, s_power, 1);
+       if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
+               goto esdpwr;
+
+       return 0;
+
+esdpwr:
+       if (icl->power)
+               icl->power(icd->pdev, 0);
+elinkpwr:
+       regulator_bulk_disable(icl->num_regulators,
+                              icl->regulators);
        return ret;
 }
 
 static int soc_camera_power_off(struct soc_camera_device *icd,
                                struct soc_camera_link *icl)
 {
-       int ret;
+       struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
+       int ret = v4l2_subdev_call(sd, core, s_power, 0);
+
+       if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
+               return ret;
 
        if (icl->power) {
                ret = icl->power(icd->pdev, 0);
@@ -1029,6 +1042,12 @@ static int soc_camera_probe(struct soc_camera_device *icd)
        if (ret < 0)
                goto ereg;
 
+       /*
+        * This will not yet call v4l2_subdev_core_ops::s_power(1), because the
+        * subdevice has not been initialised yet. We'll have to call it once
+        * again after initialisation, even though it shouldn't be needed, we
+        * don't do any IO here.
+        */
        ret = soc_camera_power_on(icd, icl);
        if (ret < 0)
                goto epower;
@@ -1099,6 +1118,10 @@ static int soc_camera_probe(struct soc_camera_device *icd)
        if (ret < 0)
                goto evidstart;
 
+       ret = v4l2_subdev_call(sd, core, s_power, 1);
+       if (ret < 0 && ret != -ENOIOCTLCMD)
+               goto esdpwr;
+
        /* Try to improve our guess of a reasonable window format */
        if (!v4l2_subdev_call(sd, video, g_mbus_fmt, &mf)) {
                icd->user_width         = mf.width;
@@ -1115,6 +1138,8 @@ static int soc_camera_probe(struct soc_camera_device *icd)
 
        return 0;
 
+esdpwr:
+       video_unregister_device(icd->vdev);
 evidstart:
        mutex_unlock(&icd->video_lock);
        soc_camera_free_user_formats(icd);
@@ -1129,6 +1154,7 @@ ectrl:
 enodrv:
 eadddev:
        video_device_release(icd->vdev);
+       icd->vdev = NULL;
 evdc:
        ici->ops->remove(icd);
 eadd: