V4L/DVB (8845): s2255drv: adds JPEG compression quality control

adds VIDIOC_S_JPEGCOMP and VIDIOC_G_JPEGCOMP ioctls for
controlling JPEG compression quality.

Signed-off-by: Dean Anderson <dean@sensoray.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 34 insertions, 1 deletions

diff --git a/drivers/media/video/s2255drv.c b/drivers/media/video/s2255drv.c
index ea40f4c8b33e..b8e104552206 100644
--- a/drivers/media/video/s2255drv.c
+++ b/drivers/media/video/s2255drv.c
@@ -58,6 +58,8 @@
 
 
 
+/* default JPEG quality */
+#define S2255_DEF_JPEG_QUAL     50
 /* vendor request in */
 #define S2255_VR_IN             0
 /* vendor request out */
@@ -242,6 +244,8 @@ struct s2255_dev {
         struct s2255_pipeinfo   pipes[MAX_PIPE_BUFFERS];
         struct s2255_bufferi            buffer[MAX_CHANNELS];
         struct s2255_mode       mode[MAX_CHANNELS];
+        /* jpeg compression */
+        struct v4l2_jpegcompression jc[MAX_CHANNELS];
         const struct s2255_fmt  *cur_fmt[MAX_CHANNELS];
         int                     cur_frame[MAX_CHANNELS];
         int                     last_frame[MAX_CHANNELS];
@@ -1035,7 +1039,8 @@ static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
                 fh->mode.color = COLOR_Y8;
                 break;
         case V4L2_PIX_FMT_JPEG:
-                fh->mode.color = COLOR_JPG | (50 << 8);
+                fh->mode.color = COLOR_JPG |
+                        (fh->dev->jc[fh->channel].quality << 8);
                 break;
         case V4L2_PIX_FMT_YUV422P:
                 fh->mode.color = COLOR_YUVPL;
@@ -1208,6 +1213,10 @@ static int s2255_set_mode(struct s2255_dev *dev, unsigned long chn,
                 dev->mode[chn].scale);
         dprintk(2, "mode contrast %x\n", mode->contrast);
 
+        /* if JPEG, set the quality */
+        if ((mode->color & MASK_COLOR) == COLOR_JPG)
+                mode->color = (dev->jc[chn].quality << 8) | COLOR_JPG;
+
         /* save the mode */
         dev->mode[chn] = *mode;
         dev->req_image_size[chn] = get_transfer_size(mode);
@@ -1472,6 +1481,27 @@ static int vidioc_s_ctrl(struct file *file, void *priv,
         return -EINVAL;
 }
 
+static int vidioc_g_jpegcomp(struct file *file, void *priv,
+                         struct v4l2_jpegcompression *jc)
+{
+        struct s2255_fh *fh = priv;
+        struct s2255_dev *dev = fh->dev;
+        *jc = dev->jc[fh->channel];
+        dprintk(2, "getting jpegcompression, quality %d\n", jc->quality);
+        return 0;
+}
+
+static int vidioc_s_jpegcomp(struct file *file, void *priv,
+                         struct v4l2_jpegcompression *jc)
+{
+        struct s2255_fh *fh = priv;
+        struct s2255_dev *dev = fh->dev;
+        if (jc->quality < 0 || jc->quality > 100)
+                return -EINVAL;
+        dev->jc[fh->channel].quality = jc->quality;
+        dprintk(2, "setting jpeg quality %d\n", jc->quality);
+        return 0;
+}
 static int s2255_open(struct inode *inode, struct file *file)
 {
         int minor = iminor(inode);
@@ -1762,6 +1792,8 @@ static const struct v4l2_ioctl_ops s2255_ioctl_ops = {
 #ifdef CONFIG_VIDEO_V4L1_COMPAT
         .vidiocgmbuf = vidioc_cgmbuf,
 #endif
+        .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
+        .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
 };
 
 static struct video_device template = {
@@ -2148,6 +2180,7 @@ static int s2255_board_init(struct s2255_dev *dev)
         for (j = 0; j < MAX_CHANNELS; j++) {
                 dev->b_acquire[j] = 0;
                 dev->mode[j] = mode_def;
+                dev->jc[j].quality = S2255_DEF_JPEG_QUAL;
                 dev->cur_fmt[j] = &formats[0];
                 dev->mode[j].restart = 1;
                 dev->req_image_size[j] = get_transfer_size(&mode_def);