1 files changed, 76 insertions, 61 deletions

diff --git a/drivers/media/video/soc_camera.c b/drivers/media/video/soc_camera.c
index 335120c2021b..a66811b43710 100644
--- a/drivers/media/video/soc_camera.c
+++ b/drivers/media/video/soc_camera.c
@@ -24,6 +24,7 @@
 #include <linux/mutex.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <linux/pm_runtime.h>
 #include <linux/vmalloc.h>
@@ -43,6 +44,51 @@ static LIST_HEAD(hosts);
 static LIST_HEAD(devices);
 static DEFINE_MUTEX(list_lock);		/* Protects the list of hosts */
 
+static int soc_camera_power_set(struct soc_camera_device *icd,
+				struct soc_camera_link *icl,
+				int power_on)
+{
+	int ret;
+
+	if (power_on) {
+		ret = regulator_bulk_enable(icl->num_regulators,
+					    icl->regulators);
+		if (ret < 0) {
+			dev_err(&icd->dev, "Cannot enable regulators\n");
+			return ret;
+		}
+
+		if (icl->power)
+			ret = icl->power(icd->pdev, power_on);
+		if (ret < 0) {
+			dev_err(&icd->dev,
+				"Platform failed to power-on the camera.\n");
+
+			regulator_bulk_disable(icl->num_regulators,
+					       icl->regulators);
+			return ret;
+		}
+	} else {
+		ret = 0;
+		if (icl->power)
+			ret = icl->power(icd->pdev, 0);
+		if (ret < 0) {
+			dev_err(&icd->dev,
+				"Platform failed to power-off the camera.\n");
+			return ret;
+		}
+
+		ret = regulator_bulk_disable(icl->num_regulators,
+					     icl->regulators);
+		if (ret < 0) {
+			dev_err(&icd->dev, "Cannot disable regulators\n");
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
 	struct soc_camera_device *icd, unsigned int fourcc)
 {
@@ -352,12 +398,6 @@ static int soc_camera_open(struct file *file)
 		return -EINVAL;
 	}
 
-	/*
-	 * Protect against icd->ops->remove() until we module_get() both
-	 * drivers.
-	 */
-	mutex_lock(&icd->video_lock);
-
 	icd->use_count++;
 
 	/* Now we really have to activate the camera */
@@ -375,11 +415,9 @@ static int soc_camera_open(struct file *file)
 			},
 		};
 
-		if (icl->power) {
-			ret = icl->power(icd->pdev, 1);
-			if (ret < 0)
-				goto epower;
-		}
+		ret = soc_camera_power_set(icd, icl, 1);
+		if (ret < 0)
+			goto epower;
 
 		/* The camera could have been already on, try to reset */
 		if (icl->reset)
@@ -405,15 +443,13 @@ static int soc_camera_open(struct file *file)
 		ret = soc_camera_set_fmt(icd, &f);
 		if (ret < 0)
 			goto esfmt;
+
+		ici->ops->init_videobuf(&icd->vb_vidq, icd);
 	}
 
 	file->private_data = icd;
 	dev_dbg(&icd->dev, "camera device open\n");
 
-	ici->ops->init_videobuf(&icd->vb_vidq, icd);
-
-	mutex_unlock(&icd->video_lock);
-
 	return 0;
 
 	/*
@@ -425,11 +461,9 @@ esfmt:
 eresume:
 	ici->ops->remove(icd);
 eiciadd:
-	if (icl->power)
-		icl->power(icd->pdev, 0);
+	soc_camera_power_set(icd, icl, 0);
 epower:
 	icd->use_count--;
-	mutex_unlock(&icd->video_lock);
 	module_put(ici->ops->owner);
 
 	return ret;
@@ -440,7 +474,6 @@ static int soc_camera_close(struct file *file)
 	struct soc_camera_device *icd = file->private_data;
 	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 
-	mutex_lock(&icd->video_lock);
 	icd->use_count--;
 	if (!icd->use_count) {
 		struct soc_camera_link *icl = to_soc_camera_link(icd);
@@ -450,15 +483,12 @@ static int soc_camera_close(struct file *file)
 
 		ici->ops->remove(icd);
 
-		if (icl->power)
-			icl->power(icd->pdev, 0);
+		soc_camera_power_set(icd, icl, 0);
 	}
 
 	if (icd->streamer == file)
 		icd->streamer = NULL;
 
-	mutex_unlock(&icd->video_lock);
-
 	module_put(ici->ops->owner);
 
 	dev_dbg(&icd->dev, "camera device close\n");
@@ -517,7 +547,7 @@ static struct v4l2_file_operations soc_camera_fops = {
 	.owner		= THIS_MODULE,
 	.open		= soc_camera_open,
 	.release	= soc_camera_close,
-	.ioctl		= video_ioctl2,
+	.unlocked_ioctl	= video_ioctl2,
 	.read		= soc_camera_read,
 	.mmap		= soc_camera_mmap,
 	.poll		= soc_camera_poll,
@@ -534,12 +564,9 @@ static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
 	if (icd->streamer && icd->streamer != file)
 		return -EBUSY;
 
-	mutex_lock(&icd->vb_vidq.vb_lock);
-
 	if (icd->vb_vidq.bufs[0]) {
 		dev_err(&icd->dev, "S_FMT denied: queue initialised\n");
-		ret = -EBUSY;
-		goto unlock;
+		return -EBUSY;
 	}
 
 	ret = soc_camera_set_fmt(icd, f);
@@ -547,9 +574,6 @@ static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
 	if (!ret && !icd->streamer)
 		icd->streamer = file;
 
-unlock:
-	mutex_unlock(&icd->vb_vidq.vb_lock);
-
 	return ret;
 }
 
@@ -622,15 +646,11 @@ static int soc_camera_streamon(struct file *file, void *priv,
 	if (icd->streamer != file)
 		return -EBUSY;
 
-	mutex_lock(&icd->video_lock);
-
 	v4l2_subdev_call(sd, video, s_stream, 1);
 
 	/* This calls buf_queue from host driver's videobuf_queue_ops */
 	ret = videobuf_streamon(&icd->vb_vidq);
 
-	mutex_unlock(&icd->video_lock);
-
 	return ret;
 }
 
@@ -648,8 +668,6 @@ static int soc_camera_streamoff(struct file *file, void *priv,
 	if (icd->streamer != file)
 		return -EBUSY;
 
-	mutex_lock(&icd->video_lock);
-
 	/*
 	 * This calls buf_release from host driver's videobuf_queue_ops for all
 	 * remaining buffers. When the last buffer is freed, stop capture
@@ -658,8 +676,6 @@ static int soc_camera_streamoff(struct file *file, void *priv,
 
 	v4l2_subdev_call(sd, video, s_stream, 0);
 
-	mutex_unlock(&icd->video_lock);
-
 	return 0;
 }
 
@@ -748,9 +764,7 @@ static int soc_camera_g_crop(struct file *file, void *fh,
 	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 	int ret;
 
-	mutex_lock(&icd->vb_vidq.vb_lock);
 	ret = ici->ops->get_crop(icd, a);
-	mutex_unlock(&icd->vb_vidq.vb_lock);
 
 	return ret;
 }
@@ -775,9 +789,6 @@ static int soc_camera_s_crop(struct file *file, void *fh,
 	dev_dbg(&icd->dev, "S_CROP(%ux%u@%u:%u)\n",
 		rect->width, rect->height, rect->left, rect->top);
 
-	/* Cropping is allowed during a running capture, guard consistency */
-	mutex_lock(&icd->vb_vidq.vb_lock);
-
 	/* If get_crop fails, we'll let host and / or client drivers decide */
 	ret = ici->ops->get_crop(icd, &current_crop);
 
@@ -795,8 +806,6 @@ static int soc_camera_s_crop(struct file *file, void *fh,
 		ret = ici->ops->set_crop(icd, a);
 	}
 
-	mutex_unlock(&icd->vb_vidq.vb_lock);
-
 	return ret;
 }
 
@@ -941,14 +950,14 @@ static int soc_camera_probe(struct device *dev)
 
 	dev_info(dev, "Probing %s\n", dev_name(dev));
 
-	if (icl->power) {
-		ret = icl->power(icd->pdev, 1);
-		if (ret < 0) {
-			dev_err(dev,
-				"Platform failed to power-on the camera.\n");
-			goto epower;
-		}
-	}
+	ret = regulator_bulk_get(icd->pdev, icl->num_regulators,
+				 icl->regulators);
+	if (ret < 0)
+		goto ereg;
+
+	ret = soc_camera_power_set(icd, icl, 1);
+	if (ret < 0)
+		goto epower;
 
 	/* The camera could have been already on, try to reset */
 	if (icl->reset)
@@ -998,7 +1007,13 @@ static int soc_camera_probe(struct device *dev)
 
 	icd->field = V4L2_FIELD_ANY;
 
-	/* ..._video_start() will create a device node, so we have to protect */
+	icd->vdev->lock = &icd->video_lock;
+
+	/*
+	 * ..._video_start() will create a device node, video_register_device()
+	 * itself is protected against concurrent open() calls, but we also have
+	 * to protect our data.
+	 */
 	mutex_lock(&icd->video_lock);
 
 	ret = soc_camera_video_start(icd);
@@ -1021,8 +1036,7 @@ static int soc_camera_probe(struct device *dev)
 
 	ici->ops->remove(icd);
 
-	if (icl->power)
-		icl->power(icd->pdev, 0);
+	soc_camera_power_set(icd, icl, 0);
 
 	mutex_unlock(&icd->video_lock);
 
@@ -1044,9 +1058,10 @@ eadddev:
 evdc:
 	ici->ops->remove(icd);
 eadd:
-	if (icl->power)
-		icl->power(icd->pdev, 0);
+	soc_camera_power_set(icd, icl, 0);
 epower:
+	regulator_bulk_free(icl->num_regulators, icl->regulators);
+ereg:
 	return ret;
 }
 
@@ -1063,10 +1078,8 @@ static int soc_camera_remove(struct device *dev)
 	BUG_ON(!dev->parent);
 
 	if (vdev) {
-		mutex_lock(&icd->video_lock);
 		video_unregister_device(vdev);
 		icd->vdev = NULL;
-		mutex_unlock(&icd->video_lock);
 	}
 
 	if (icl->board_info) {
@@ -1081,6 +1094,8 @@ static int soc_camera_remove(struct device *dev)
 	}
 	soc_camera_free_user_formats(icd);
 
+	regulator_bulk_free(icl->num_regulators, icl->regulators);
+
 	return 0;
 }