soc-camera: readability improvements, more strict operations checks

From: Guennadi Liakhovetski <g.liakhovetski@gmx.de>

Simplify multiple drivers by replacing f->fmt.pix.* with a single pointer
dereference, merge some needlessly broken lines, verify host and camera
operations pointers on registration.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
---
 drivers/media/video/mt9m001.c             |   20 ++++----
 drivers/media/video/mt9m111.c             |   10 ++--
 drivers/media/video/mt9v022.c             |   20 ++++----
 drivers/media/video/pxa_camera.c          |   21 +++-----
 drivers/media/video/soc_camera.c          |   74 +++++++++++++++++------------
 drivers/media/video/soc_camera_platform.c |    5 +-
 6 files changed, 81 insertions(+), 69 deletions(-)

6 files changed, 81 insertions, 69 deletions

diff --git a/linux/drivers/media/video/mt9m001.c b/linux/drivers/media/video/mt9m001.c
index ed8a02269..2f431a5d6 100644
--- a/linux/drivers/media/video/mt9m001.c
+++ b/linux/drivers/media/video/mt9m001.c
@@ -327,15 +327,17 @@ static int mt9m001_set_fmt(struct soc_camera_device *icd,
 static int mt9m001_try_fmt(struct soc_camera_device *icd,
 			   struct v4l2_format *f)
 {
-	if (f->fmt.pix.height < 32 + icd->y_skip_top)
-		f->fmt.pix.height = 32 + icd->y_skip_top;
-	if (f->fmt.pix.height > 1024 + icd->y_skip_top)
-		f->fmt.pix.height = 1024 + icd->y_skip_top;
-	if (f->fmt.pix.width < 48)
-		f->fmt.pix.width = 48;
-	if (f->fmt.pix.width > 1280)
-		f->fmt.pix.width = 1280;
-	f->fmt.pix.width &= ~0x01; /* has to be even, unsure why was ~3 */
+	struct v4l2_pix_format *pix = &f->fmt.pix;
+
+	if (pix->height < 32 + icd->y_skip_top)
+		pix->height = 32 + icd->y_skip_top;
+	if (pix->height > 1024 + icd->y_skip_top)
+		pix->height = 1024 + icd->y_skip_top;
+	if (pix->width < 48)
+		pix->width = 48;
+	if (pix->width > 1280)
+		pix->width = 1280;
+	pix->width &= ~0x01; /* has to be even, unsure why was ~3 */
 
 	return 0;
 }
diff --git a/linux/drivers/media/video/mt9m111.c b/linux/drivers/media/video/mt9m111.c
index a554e6c55..39f2e83cf 100644
--- a/linux/drivers/media/video/mt9m111.c
+++ b/linux/drivers/media/video/mt9m111.c
@@ -503,10 +503,12 @@ static int mt9m111_set_fmt(struct soc_camera_device *icd,
 static int mt9m111_try_fmt(struct soc_camera_device *icd,
 			   struct v4l2_format *f)
 {
-	if (f->fmt.pix.height > MT9M111_MAX_HEIGHT)
-		f->fmt.pix.height = MT9M111_MAX_HEIGHT;
-	if (f->fmt.pix.width > MT9M111_MAX_WIDTH)
-		f->fmt.pix.width = MT9M111_MAX_WIDTH;
+	struct v4l2_pix_format *pix = &f->fmt.pix;
+
+	if (pix->height > MT9M111_MAX_HEIGHT)
+		pix->height = MT9M111_MAX_HEIGHT;
+	if (pix->width > MT9M111_MAX_WIDTH)
+		pix->width = MT9M111_MAX_WIDTH;
 
 	return 0;
 }
diff --git a/linux/drivers/media/video/mt9v022.c b/linux/drivers/media/video/mt9v022.c
index 419cbe61f..ff30c99e9 100644
--- a/linux/drivers/media/video/mt9v022.c
+++ b/linux/drivers/media/video/mt9v022.c
@@ -406,15 +406,17 @@ static int mt9v022_set_fmt(struct soc_camera_device *icd,
 static int mt9v022_try_fmt(struct soc_camera_device *icd,
 			   struct v4l2_format *f)
 {
-	if (f->fmt.pix.height < 32 + icd->y_skip_top)
-		f->fmt.pix.height = 32 + icd->y_skip_top;
-	if (f->fmt.pix.height > 480 + icd->y_skip_top)
-		f->fmt.pix.height = 480 + icd->y_skip_top;
-	if (f->fmt.pix.width < 48)
-		f->fmt.pix.width = 48;
-	if (f->fmt.pix.width > 752)
-		f->fmt.pix.width = 752;
-	f->fmt.pix.width &= ~0x03; /* ? */
+	struct v4l2_pix_format *pix = &f->fmt.pix;
+
+	if (pix->height < 32 + icd->y_skip_top)
+		pix->height = 32 + icd->y_skip_top;
+	if (pix->height > 480 + icd->y_skip_top)
+		pix->height = 480 + icd->y_skip_top;
+	if (pix->width < 48)
+		pix->width = 48;
+	if (pix->width > 752)
+		pix->width = 752;
+	pix->width &= ~0x03; /* ? */
 
 	return 0;
 }
diff --git a/linux/drivers/media/video/pxa_camera.c b/linux/drivers/media/video/pxa_camera.c
index 108219e79..54801a527 100644
--- a/linux/drivers/media/video/pxa_camera.c
+++ b/linux/drivers/media/video/pxa_camera.c
@@ -245,8 +245,7 @@ static int pxa_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
 			      unsigned int *size)
 {
 	struct soc_camera_device *icd = vq->priv_data;
-	struct soc_camera_host *ici =
-		to_soc_camera_host(icd->dev.parent);
+	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 	struct pxa_camera_dev *pcdev = ici->priv;
 
 	dev_dbg(&icd->dev, "count=%d, size=%d\n", *count, *size);
@@ -272,8 +271,7 @@ static int pxa_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
 static void free_buffer(struct videobuf_queue *vq, struct pxa_buffer *buf)
 {
 	struct soc_camera_device *icd = vq->priv_data;
-	struct soc_camera_host *ici =
-		to_soc_camera_host(icd->dev.parent);
+	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 	struct pxa_camera_dev *pcdev = ici->priv;
 	struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb);
 	int i;
@@ -349,8 +347,7 @@ static int pxa_videobuf_prepare(struct videobuf_queue *vq,
 		struct videobuf_buffer *vb, enum v4l2_field field)
 {
 	struct soc_camera_device *icd = vq->priv_data;
-	struct soc_camera_host *ici =
-		to_soc_camera_host(icd->dev.parent);
+	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 	struct pxa_camera_dev *pcdev = ici->priv;
 	struct pxa_buffer *buf = container_of(vb, struct pxa_buffer, vb);
 	int ret;
@@ -469,8 +466,7 @@ static void pxa_videobuf_queue(struct videobuf_queue *vq,
 			       struct videobuf_buffer *vb)
 {
 	struct soc_camera_device *icd = vq->priv_data;
-	struct soc_camera_host *ici =
-		to_soc_camera_host(icd->dev.parent);
+	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 	struct pxa_camera_dev *pcdev = ici->priv;
 	struct pxa_buffer *buf = container_of(vb, struct pxa_buffer, vb);
 	struct pxa_buffer *active;
@@ -920,8 +916,7 @@ static int test_platform_param(struct pxa_camera_dev *pcdev,
 
 static int pxa_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt)
 {
-	struct soc_camera_host *ici =
-		to_soc_camera_host(icd->dev.parent);
+	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 	struct pxa_camera_dev *pcdev = ici->priv;
 	unsigned long dw, bpp, bus_flags, camera_flags, common_flags;
 	u32 cicr0, cicr1, cicr2, cicr3, cicr4 = 0;
@@ -1303,8 +1298,7 @@ static int pxa_camera_querycap(struct soc_camera_host *ici,
 
 static int pxa_camera_suspend(struct soc_camera_device *icd, pm_message_t state)
 {
-	struct soc_camera_host *ici =
-		to_soc_camera_host(icd->dev.parent);
+	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 	struct pxa_camera_dev *pcdev = ici->priv;
 	int i = 0, ret = 0;
 
@@ -1322,8 +1316,7 @@ static int pxa_camera_suspend(struct soc_camera_device *icd, pm_message_t state)
 
 static int pxa_camera_resume(struct soc_camera_device *icd)
 {
-	struct soc_camera_host *ici =
-		to_soc_camera_host(icd->dev.parent);
+	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 	struct pxa_camera_dev *pcdev = ici->priv;
 	int i = 0, ret = 0;
 
diff --git a/linux/drivers/media/video/soc_camera.c b/linux/drivers/media/video/soc_camera.c
index d512cede8..2e8f11a0d 100644
--- a/linux/drivers/media/video/soc_camera.c
+++ b/linux/drivers/media/video/soc_camera.c
@@ -99,8 +99,7 @@ static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
 {
 	struct soc_camera_file *icf = file->private_data;
 	struct soc_camera_device *icd = icf->icd;
-	struct soc_camera_host *ici =
-		to_soc_camera_host(icd->dev.parent);
+	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 	enum v4l2_field field;
 	int ret;
 
@@ -164,8 +163,7 @@ static int soc_camera_reqbufs(struct file *file, void *priv,
 	int ret;
 	struct soc_camera_file *icf = file->private_data;
 	struct soc_camera_device *icd = icf->icd;
-	struct soc_camera_host *ici =
-		to_soc_camera_host(icd->dev.parent);
+	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 
 	WARN_ON(priv != file->private_data);
 
@@ -389,8 +387,7 @@ static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
 {
 	struct soc_camera_file *icf = file->private_data;
 	struct soc_camera_device *icd = icf->icd;
-	struct soc_camera_host *ici =
-		to_soc_camera_host(icd->dev.parent);
+	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 
 	if (list_empty(&icf->vb_vidq.stream)) {
 		dev_err(&icd->dev, "Trying to poll with no queued buffers!\n");
@@ -416,9 +413,9 @@ static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
 {
 	struct soc_camera_file *icf = file->private_data;
 	struct soc_camera_device *icd = icf->icd;
-	struct soc_camera_host *ici =
-		to_soc_camera_host(icd->dev.parent);
-	__u32 pixfmt = f->fmt.pix.pixelformat;
+	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
+	struct v4l2_pix_format *pix = &f->fmt.pix;
+	__u32 pixfmt = pix->pixelformat;
 	int ret;
 	struct v4l2_rect rect;
 
@@ -430,9 +427,9 @@ static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
 
 	rect.left	= icd->x_current;
 	rect.top	= icd->y_current;
-	rect.width	= f->fmt.pix.width;
-	rect.height	= f->fmt.pix.height;
-	ret = ici->ops->set_fmt(icd, f->fmt.pix.pixelformat, &rect);
+	rect.width	= pix->width;
+	rect.height	= pix->height;
+	ret = ici->ops->set_fmt(icd, pix->pixelformat, &rect);
 	if (ret < 0) {
 		return ret;
 	} else if (!icd->current_fmt ||
@@ -444,7 +441,7 @@ static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
 
 	icd->width		= rect.width;
 	icd->height		= rect.height;
-	icf->vb_vidq.field	= f->fmt.pix.field;
+	icf->vb_vidq.field	= pix->field;
 	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 		dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
 			 f->type);
@@ -480,16 +477,17 @@ static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
 {
 	struct soc_camera_file *icf = file->private_data;
 	struct soc_camera_device *icd = icf->icd;
+	struct v4l2_pix_format *pix = &f->fmt.pix;
 
 	WARN_ON(priv != file->private_data);
 
-	f->fmt.pix.width	= icd->width;
-	f->fmt.pix.height	= icd->height;
-	f->fmt.pix.field	= icf->vb_vidq.field;
-	f->fmt.pix.pixelformat	= icd->current_fmt->fourcc;
-	f->fmt.pix.bytesperline	= f->fmt.pix.width *
+	pix->width		= icd->width;
+	pix->height		= icd->height;
+	pix->field		= icf->vb_vidq.field;
+	pix->pixelformat	= icd->current_fmt->fourcc;
+	pix->bytesperline	= pix->width *
 		DIV_ROUND_UP(icd->current_fmt->depth, 8);
-	f->fmt.pix.sizeimage	= f->fmt.pix.height * f->fmt.pix.bytesperline;
+	pix->sizeimage		= pix->height * pix->bytesperline;
 	dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n",
 		icd->current_fmt->fourcc);
 	return 0;
@@ -500,8 +498,7 @@ static int soc_camera_querycap(struct file *file, void  *priv,
 {
 	struct soc_camera_file *icf = file->private_data;
 	struct soc_camera_device *icd = icf->icd;
-	struct soc_camera_host *ici =
-		to_soc_camera_host(icd->dev.parent);
+	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 
 	WARN_ON(priv != file->private_data);
 
@@ -652,8 +649,7 @@ static int soc_camera_s_crop(struct file *file, void *fh,
 {
 	struct soc_camera_file *icf = file->private_data;
 	struct soc_camera_device *icd = icf->icd;
-	struct soc_camera_host *ici =
-		to_soc_camera_host(icd->dev.parent);
+	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 	int ret;
 
 	if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
@@ -777,13 +773,9 @@ static int scan_add_device(struct soc_camera_device *icd)
 static int soc_camera_probe(struct device *dev)
 {
 	struct soc_camera_device *icd = to_soc_camera_dev(dev);
-	struct soc_camera_host *ici =
-		to_soc_camera_host(icd->dev.parent);
+	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 	int ret;
 
-	if (!icd->ops->probe)
-		return -ENODEV;
-
 	/* We only call ->add() here to activate and probe the camera.
 	 * We shall ->remove() and deactivate it immediately afterwards. */
 	ret = ici->ops->add(icd);
@@ -864,7 +856,16 @@ int soc_camera_host_register(struct soc_camera_host *ici)
 	int ret;
 	struct soc_camera_host *ix;
 
-	if (!ici->ops->init_videobuf || !ici->ops->add || !ici->ops->remove)
+	if (!ici || !ici->ops ||
+	    !ici->ops->try_fmt ||
+	    !ici->ops->set_fmt ||
+	    !ici->ops->set_bus_param ||
+	    !ici->ops->querycap ||
+	    !ici->ops->init_videobuf ||
+	    !ici->ops->reqbufs ||
+	    !ici->ops->add ||
+	    !ici->ops->remove ||
+	    !ici->ops->poll)
 		return -EINVAL;
 
 	/* Number might be equal to the platform device ID */
@@ -932,7 +933,16 @@ int soc_camera_device_register(struct soc_camera_device *icd)
 	struct soc_camera_device *ix;
 	int num = -1, i;
 
-	if (!icd)
+	if (!icd || !icd->ops ||
+	    !icd->ops->probe ||
+	    !icd->ops->init ||
+	    !icd->ops->release ||
+	    !icd->ops->start_capture ||
+	    !icd->ops->stop_capture ||
+	    !icd->ops->set_fmt ||
+	    !icd->ops->try_fmt ||
+	    !icd->ops->query_bus_param ||
+	    !icd->ops->set_bus_param)
 		return -EINVAL;
 
 	for (i = 0; i < 256 && num < 0; i++) {
@@ -954,7 +964,9 @@ int soc_camera_device_register(struct soc_camera_device *icd)
 	icd->dev.bus = &soc_camera_bus_type;
 	dev_set_name(&icd->dev, "%u-%u", icd->iface, icd->devnum);
 
-	icd->dev.release = dummy_release;
+	icd->dev.release	= dummy_release;
+	icd->use_count		= 0;
+	icd->host_priv		= NULL;
 
 	return scan_add_device(icd);
 }
diff --git a/linux/drivers/media/video/soc_camera_platform.c b/linux/drivers/media/video/soc_camera_platform.c
index c23871e4c..013ab06e3 100644
--- a/linux/drivers/media/video/soc_camera_platform.c
+++ b/linux/drivers/media/video/soc_camera_platform.c
@@ -89,9 +89,10 @@ static int soc_camera_platform_try_fmt(struct soc_camera_device *icd,
 				       struct v4l2_format *f)
 {
 	struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
+	struct v4l2_pix_format *pix = &f->fmt.pix;
 
-	f->fmt.pix.width = p->format.width;
-	f->fmt.pix.height = p->format.height;
+	pix->width = p->format.width;
+	pix->height = p->format.height;
 	return 0;
 }