V4L/DVB (7567): em28xx: Some cleanups

Removes some fields from data structs.

There are some fields that are just caching some calculus for buffer
size. The calculus were moved to the places it were needed and the now
unused fields were removed.
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/em28xx/em28xx-core.c

@@ -396,13 +396,13 @@ int em28xx_set_alternate(struct em28xx *dev)
 {
 	int errCode, prev_alt = dev->alt;
 	int i;
-	unsigned int min_pkt_size = dev->bytesperline + 4;
+	unsigned int min_pkt_size = dev->width * 2 + 4;
 
 	/* When image size is bigger than a certain value,
 	   the frame size should be increased, otherwise, only
 	   green screen will be received.
 	 */
-	if (dev->frame_size > 720*240*2)
+	if (dev->width * 2 * dev->height > 720 * 240 * 2)
 		min_pkt_size *= 2;
 
 	for (i = 0; i < dev->num_alt; i++) {

drivers/media/video/em28xx/em28xx-video.c

@@ -154,12 +154,7 @@ static void em28xx_copy_video(struct em28xx *dev,
 {
 	void *fieldstart, *startwrite, *startread;
 	int  linesdone, currlinedone, offset, lencopy, remain;
-
-	if (dev->frame_size != buf->vb.size) {
-		em28xx_errdev("size %i and buf.length %lu are different!\n",
-			      dev->frame_size, buf->vb.size);
-		return;
-	}
+	int bytesperline = dev->width << 1;
 
 	if (dma_q->pos + len > buf->vb.size)
 		len = buf->vb.size - dma_q->pos;
@@ -177,13 +172,13 @@ static void em28xx_copy_video(struct em28xx *dev,
 	if (buf->top_field)
 		fieldstart = outp;
 	else
-		fieldstart = outp + dev->bytesperline;
+		fieldstart = outp + bytesperline;
 
-	linesdone = dma_q->pos / dev->bytesperline;
-	currlinedone = dma_q->pos % dev->bytesperline;
-	offset = linesdone * dev->bytesperline * 2 + currlinedone;
+	linesdone = dma_q->pos / bytesperline;
+	currlinedone = dma_q->pos % bytesperline;
+	offset = linesdone * bytesperline * 2 + currlinedone;
 	startwrite = fieldstart + offset;
-	lencopy = dev->bytesperline - currlinedone;
+	lencopy = bytesperline - currlinedone;
 	lencopy = lencopy > remain ? remain : lencopy;
 
 	if ((char *)startwrite + lencopy > (char *)outp + buf->vb.size) {
@@ -199,12 +194,12 @@ static void em28xx_copy_video(struct em28xx *dev,
 	remain -= lencopy;
 
 	while (remain > 0) {
-		startwrite += lencopy + dev->bytesperline;
+		startwrite += lencopy + bytesperline;
 		startread += lencopy;
-		if (dev->bytesperline > remain)
+		if (bytesperline > remain)
 			lencopy = remain;
 		else
-			lencopy = dev->bytesperline;
+			lencopy = bytesperline;
 
 		if ((char *)startwrite + lencopy > (char *)outp + buf->vb.size) {
 			em28xx_isocdbg("Overflow of %zi bytes past buffer end (2)\n",
@@ -617,8 +612,6 @@ buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
 	struct em28xx_dmaqueue *vidq = &dev->vidq;
 	int                  rc = 0, urb_init = 0;
 
-	/* BUG_ON(NULL == fh->fmt); */
-
 	/* FIXME: It assumes depth = 16 */
 	/* The only currently supported format is 16 bits/pixel */
 	buf->vb.size = 16 * dev->width * dev->height >> 3;
@@ -626,7 +619,6 @@ buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
 	if (0 != buf->vb.baddr  &&  buf->vb.bsize < buf->vb.size)
 		return -EINVAL;
 
-	buf->fmt       = fh->fmt;
 	buf->vb.width  = dev->width;
 	buf->vb.height = dev->height;
 	buf->vb.field  = field;
@@ -877,8 +869,8 @@ static int vidioc_g_fmt_cap(struct file *file, void *priv,
 	f->fmt.pix.width = dev->width;
 	f->fmt.pix.height = dev->height;
 	f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
-	f->fmt.pix.bytesperline = dev->bytesperline;
-	f->fmt.pix.sizeimage = dev->frame_size;
+	f->fmt.pix.bytesperline = dev->width * 2;
+	f->fmt.pix.sizeimage = f->fmt.pix.bytesperline  * dev->height;
 	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 
 	/* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
@@ -979,9 +971,6 @@ static int vidioc_s_fmt_cap(struct file *file, void *priv,
 	/* set new image size */
 	dev->width = f->fmt.pix.width;
 	dev->height = f->fmt.pix.height;
-	dev->frame_size = dev->width * dev->height * 2;
-	dev->field_size = dev->frame_size >> 1;
-	dev->bytesperline = dev->width * 2;
 	get_scale(dev, dev->width, dev->height, &dev->hscale, &dev->vscale);
 
 	em28xx_set_alternate(dev);
@@ -1019,9 +1008,6 @@ static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id *norm)
 	/* set new image size */
 	dev->width = f.fmt.pix.width;
 	dev->height = f.fmt.pix.height;
-	dev->frame_size = dev->width * dev->height * 2;
-	dev->field_size = dev->frame_size >> 1;
-	dev->bytesperline = dev->width * 2;
 	get_scale(dev, dev->width, dev->height, &dev->hscale, &dev->vscale);
 
 	em28xx_resolution_set(dev);
@@ -1736,9 +1722,6 @@ static int em28xx_v4l2_open(struct inode *inode, struct file *filp)
 	if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && dev->users == 0) {
 		dev->width = norm_maxw(dev);
 		dev->height = norm_maxh(dev);
-		dev->frame_size = dev->width * dev->height * 2;
-		dev->field_size = dev->frame_size >> 1;	/*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
-		dev->bytesperline = dev->width * 2;
 		dev->hscale = 0;
 		dev->vscale = 0;
 
@@ -2152,10 +2135,6 @@ static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
 	dev->width = maxw;
 	dev->height = maxh;
 	dev->interlaced = EM28XX_INTERLACED_DEFAULT;
-	dev->field_size = dev->width * dev->height;
-	dev->frame_size =
-	    dev->interlaced ? dev->field_size << 1 : dev->field_size;
-	dev->bytesperline = dev->width * 2;
 	dev->hscale = 0;
 	dev->vscale = 0;
 	dev->ctl_input = 2;

drivers/media/video/em28xx/em28xx.h

@@ -128,8 +128,6 @@ struct em28xx_buffer {
 	/* common v4l buffer stuff -- must be first */
 	struct videobuf_buffer vb;
 
-	struct em28xx_fmt *fmt;
-
 	struct list_head frame;
 	int top_field;
 	int receiving;
@@ -294,9 +292,6 @@ struct em28xx {
 	/* frame properties */
 	int width;		/* current frame width */
 	int height;		/* current frame height */
-	int frame_size;		/* current frame size */
-	int field_size;		/* current field size */
-	int bytesperline;
 	int hscale;		/* horizontal scale factor (see datasheet) */
 	int vscale;		/* vertical scale factor (see datasheet) */
 	int interlaced;		/* 1=interlace fileds, 0=just top fileds */
@@ -352,9 +347,7 @@ struct em28xx_fh {
 	unsigned int  stream_on:1;	/* Locks streams */
 	int           radio;
 
-	unsigned int                 width, height;
 	struct videobuf_queue        vb_vidq;
-	struct em28xx_fmt            *fmt;
 
 	enum v4l2_buf_type           type;
 };