V4L/DVB (9927): em28xx: use a more standard way to specify video formats

This patch uses the same code for enumberating video formats that are
present on cx88, bttv and saa7134 drivers.

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

3 files changed, 69 insertions, 21 deletions

diff --git a/drivers/media/video/em28xx/em28xx-core.c b/drivers/media/video/em28xx/em28xx-core.c
index f515f879125..c647dcb20a5 100644
--- a/drivers/media/video/em28xx/em28xx-core.c
+++ b/drivers/media/video/em28xx/em28xx-core.c
@@ -621,10 +621,19 @@ int em28xx_capture_start(struct em28xx *dev, int start)
         return rc;
 }
 
-int em28xx_outfmt_set_yuv422(struct em28xx *dev)
+int em28xx_set_outfmt(struct em28xx *dev)
 {
-        em28xx_write_reg(dev, EM28XX_R27_OUTFMT, 0x34);
-        em28xx_write_reg(dev, EM28XX_R10_VINMODE, 0x10);
+        int ret;
+
+        ret = em28xx_write_reg_bits(dev, EM28XX_R27_OUTFMT,
+                                    dev->format->reg | 0x20, 0x3f);
+        if (ret < 0)
+                return ret;
+
+        ret = em28xx_write_reg(dev, EM28XX_R10_VINMODE, 0x10);
+        if (ret < 0)
+                return ret;
+
         return em28xx_write_reg(dev, EM28XX_R11_VINCTRL, 0x11);
 }
 
@@ -686,7 +695,7 @@ int em28xx_resolution_set(struct em28xx *dev)
         width = norm_maxw(dev);
         height = norm_maxh(dev) >> 1;
 
-        em28xx_outfmt_set_yuv422(dev);
+        em28xx_set_outfmt(dev);
         em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
         em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2);
         return em28xx_scaler_set(dev, dev->hscale, dev->vscale);
diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c
index 1b56e78b774..dbae8bcb18d 100644
--- a/drivers/media/video/em28xx/em28xx-video.c
+++ b/drivers/media/video/em28xx/em28xx-video.c
@@ -96,6 +96,16 @@ MODULE_PARM_DESC(video_debug, "enable debug messages [video]");
 /* Bitmask marking allocated devices from 0 to EM28XX_MAXBOARDS */
 static unsigned long em28xx_devused;
 
+/* supported video standards */
+static struct em28xx_fmt format[] = {
+        {
+                .name     = "16bpp YUY2, 4:2:2, packed",
+                .fourcc   = V4L2_PIX_FMT_YUYV,
+                .depth    = 16,
+                .reg      = 0x14,
+        },
+};
+
 /* supported controls */
 /* Common to all boards */
 static struct v4l2_queryctrl em28xx_qctrl[] = {
@@ -386,7 +396,8 @@ buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
         struct em28xx        *dev = fh->dev;
         struct v4l2_frequency f;
 
-        *size = 16 * fh->dev->width * fh->dev->height >> 3;
+        *size = (fh->dev->width * fh->dev->height * dev->format->depth + 7) >> 3;
+
         if (0 == *count)
                 *count = EM28XX_DEF_BUF;
 
@@ -439,9 +450,7 @@ buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
         struct em28xx        *dev = fh->dev;
         int                  rc = 0, urb_init = 0;
 
-        /* FIXME: It assumes depth = 16 */
-        /* The only currently supported format is 16 bits/pixel */
-        buf->vb.size = 16 * dev->width * dev->height >> 3;
+        buf->vb.size = (fh->dev->width * fh->dev->height * dev->format->depth + 7) >> 3;
 
         if (0 != buf->vb.baddr  &&  buf->vb.bsize < buf->vb.size)
                 return -EINVAL;
@@ -536,7 +545,7 @@ static int em28xx_config(struct em28xx *dev)
         dev->mute = 1;          /* maybe not the right place... */
         dev->volume = 0x1f;
 
-        em28xx_outfmt_set_yuv422(dev);
+        em28xx_set_outfmt(dev);
         em28xx_colorlevels_set_default(dev);
         em28xx_compression_disable(dev);
 
@@ -704,8 +713,8 @@ static int vidioc_g_fmt_vid_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->width * 2;
+        f->fmt.pix.pixelformat = dev->format->fourcc;
+        f->fmt.pix.bytesperline = (dev->width * dev->format->depth + 7) >> 3;
         f->fmt.pix.sizeimage = f->fmt.pix.bytesperline  * dev->height;
         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 
@@ -717,6 +726,17 @@ static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
         return 0;
 }
 
+static struct em28xx_fmt *format_by_fourcc(unsigned int fourcc)
+{
+        unsigned int i;
+
+        for (i = 0; i < ARRAY_SIZE(format); i++)
+                if (format[i].fourcc == fourcc)
+                        return &format[i];
+
+        return NULL;
+}
+
 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
                         struct v4l2_format *f)
 {
@@ -727,6 +747,14 @@ static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
         unsigned int          maxw   = norm_maxw(dev);
         unsigned int          maxh   = norm_maxh(dev);
         unsigned int          hscale, vscale;
+        struct em28xx_fmt     *fmt;
+
+        fmt = format_by_fourcc(f->fmt.pix.pixelformat);
+        if (!fmt) {
+                em28xx_videodbg("Fourcc format (%08x) invalid.\n",
+                                f->fmt.pix.pixelformat);
+                return -EINVAL;
+        }
 
         /* width must even because of the YUYV format
            height must be even because of interlacing */
@@ -765,9 +793,9 @@ static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
 
         f->fmt.pix.width = width;
         f->fmt.pix.height = height;
-        f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
-        f->fmt.pix.bytesperline = width * 2;
-        f->fmt.pix.sizeimage = width * 2 * height;
+        f->fmt.pix.pixelformat = fmt->fourcc;
+        f->fmt.pix.bytesperline = (dev->width * fmt->depth + 7) >> 3;
+        f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * height;
         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
         f->fmt.pix.field = V4L2_FIELD_INTERLACED;
 
@@ -780,6 +808,7 @@ static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
         struct em28xx_fh      *fh  = priv;
         struct em28xx         *dev = fh->dev;
         int                   rc;
+        struct em28xx_fmt     *fmt;
 
         rc = check_dev(dev);
         if (rc < 0)
@@ -789,6 +818,10 @@ static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 
         vidioc_try_fmt_vid_cap(file, priv, f);
 
+        fmt = format_by_fourcc(f->fmt.pix.pixelformat);
+        if (!fmt)
+                return -EINVAL;
+
         if (videobuf_queue_is_busy(&fh->vb_vidq)) {
                 em28xx_errdev("%s queue busy\n", __func__);
                 rc = -EBUSY;
@@ -804,6 +837,7 @@ static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
         /* set new image size */
         dev->width = f->fmt.pix.width;
         dev->height = f->fmt.pix.height;
+        dev->format = fmt;
         get_scale(dev, dev->width, dev->height, &dev->hscale, &dev->vscale);
 
         em28xx_set_alternate(dev);
@@ -1332,15 +1366,13 @@ static int vidioc_querycap(struct file *file, void  *priv,
 }
 
 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
-                                        struct v4l2_fmtdesc *fmtd)
+                                        struct v4l2_fmtdesc *f)
 {
-        if (fmtd->index != 0)
+        if (unlikely(f->index >= ARRAY_SIZE(format)))
                 return -EINVAL;
 
-        fmtd->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-        strcpy(fmtd->description, "Packed YUY2");
-        fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
-        memset(fmtd->reserved, 0, sizeof(fmtd->reserved));
+        strlcpy(f->description, format[f->index].name, sizeof(f->description));
+        f->pixelformat = format[f->index].fourcc;
 
         return 0;
 }
@@ -2075,6 +2107,7 @@ static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
         dev->em28xx_write_regs_req = em28xx_write_regs_req;
         dev->em28xx_read_reg_req = em28xx_read_reg_req;
         dev->board.is_em2800 = em28xx_boards[dev->model].is_em2800;
+        dev->format = &format[0];
 
         em28xx_pre_card_setup(dev);
 
@@ -2482,3 +2515,4 @@ static void __exit em28xx_module_exit(void)
 
 module_init(em28xx_module_init);
 module_exit(em28xx_module_exit);
+
diff --git a/drivers/media/video/em28xx/em28xx.h b/drivers/media/video/em28xx/em28xx.h
index 54802d2d1bc..80d1d55d80f 100644
--- a/drivers/media/video/em28xx/em28xx.h
+++ b/drivers/media/video/em28xx/em28xx.h
@@ -209,9 +209,12 @@ struct em28xx_usb_isoc_ctl {
 
 };
 
+/* Struct to enumberate video formats */
 struct em28xx_fmt {
         char  *name;
         u32   fourcc;          /* v4l2 format id */
+        int   depth;
+        int   reg;
 };
 
 /* buffer for one video frame */
@@ -430,6 +433,8 @@ struct em28xx {
         unsigned int has_audio_class:1;
         unsigned int has_alsa_audio:1;
 
+        struct em28xx_fmt *format;
+
         struct em28xx_IR *ir;
 
         /* Some older em28xx chips needs a waiting time after writing */
@@ -564,7 +569,7 @@ int em28xx_audio_setup(struct em28xx *dev);
 
 int em28xx_colorlevels_set_default(struct em28xx *dev);
 int em28xx_capture_start(struct em28xx *dev, int start);
-int em28xx_outfmt_set_yuv422(struct em28xx *dev);
+int em28xx_set_outfmt(struct em28xx *dev);
 int em28xx_resolution_set(struct em28xx *dev);
 int em28xx_set_alternate(struct em28xx *dev);
 int em28xx_init_isoc(struct em28xx *dev, int max_packets,