V4L/DVB (10080): soc-camera: readability improvements, more strict operations checks

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>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

6 files changed, 81 insertions, 69 deletions

diff --git a/drivers/media/video/mt9m001.c b/drivers/media/video/mt9m001.c
index b58f0f85e30f..e81b3247f79e 100644
--- a/drivers/media/video/mt9m001.c
+++ b/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/drivers/media/video/mt9m111.c b/drivers/media/video/mt9m111.c
index 3dfeea4e94b1..c89ea41fe259 100644
--- a/drivers/media/video/mt9m111.c
+++ b/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/drivers/media/video/mt9v022.c b/drivers/media/video/mt9v022.c
index 3b3a6a027b1d..be20747b8138 100644
--- a/drivers/media/video/mt9v022.c
+++ b/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/drivers/media/video/pxa_camera.c b/drivers/media/video/pxa_camera.c
index 28ea13f7b2b0..f6919a0e2ac2 100644
--- a/drivers/media/video/pxa_camera.c
+++ b/drivers/media/video/pxa_camera.c
@@ -240,8 +240,7 @@ 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);
@@ -267,8 +266,7 @@ 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;
@@ -344,8 +342,7 @@ 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;
@@ -464,8 +461,7 @@ 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;
@@ -915,8 +911,7 @@ 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;
@@ -1298,8 +1293,7 @@ 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;
 
@@ -1317,8 +1311,7 @@ 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/drivers/media/video/soc_camera.c b/drivers/media/video/soc_camera.c
index 176017501055..d5613cdd93a6 100644
--- a/drivers/media/video/soc_camera.c
+++ b/drivers/media/video/soc_camera.c
@@ -98,8 +98,7 @@ 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;
 
@@ -163,8 +162,7 @@ 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);
 
@@ -388,8 +386,7 @@ 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");
@@ -415,9 +412,9 @@ 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;
 
@@ -429,9 +426,9 @@ 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 ||
@@ -443,7 +440,7 @@ 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);
@@ -479,16 +476,17 @@ 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;
@@ -499,8 +497,7 @@ 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);
 
@@ -651,8 +648,7 @@ 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)
@@ -776,13 +772,9 @@ 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);
@@ -863,7 +855,16 @@ 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 */
@@ -931,7 +932,16 @@ 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++) {
@@ -953,7 +963,9 @@ 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/drivers/media/video/soc_camera_platform.c b/drivers/media/video/soc_camera_platform.c
index c23871e4c1e6..013ab06e3180 100644
--- a/drivers/media/video/soc_camera_platform.c
+++ b/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;
 }