[media] vivi: add the alpha component control

Useful to set the alpha component for the pixel formats with an alpha channel.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 21 insertions, 8 deletions

diff --git a/drivers/media/video/vivi.c b/drivers/media/video/vivi.c
index 5e457452a6e1..0960d7f0d394 100644
--- a/drivers/media/video/vivi.c
+++ b/drivers/media/video/vivi.c
@@ -200,6 +200,7 @@ struct vivi_dev {
                 struct v4l2_ctrl           *gain;
         };
         struct v4l2_ctrl           *volume;
+        struct v4l2_ctrl           *alpha;
         struct v4l2_ctrl           *button;
         struct v4l2_ctrl           *boolean;
         struct v4l2_ctrl           *int32;
@@ -237,6 +238,7 @@ struct vivi_dev {
         u8                         bars[9][3];
         u8                         line[MAX_WIDTH * 8];
         unsigned int               pixelsize;
+        u8                         alpha_component;
 };
 
 /* ------------------------------------------------------------------
@@ -359,6 +361,7 @@ static void precalculate_bars(struct vivi_dev *dev)
 static void gen_twopix(struct vivi_dev *dev, u8 *buf, int colorpos, bool odd)
 {
         u8 r_y, g_u, b_v;
+        u8 alpha = dev->alpha_component;
         int color;
         u8 *p;
 
@@ -436,14 +439,14 @@ static void gen_twopix(struct vivi_dev *dev, u8 *buf, int colorpos, bool odd)
                                 *p = (g_u << 5) | b_v;
                                 break;
                         case 1:
-                                *p = (r_y << 2) | (g_u >> 3);
+                                *p = (alpha & 0x80) | (r_y << 2) | (g_u >> 3);
                                 break;
                         }
                         break;
                 case V4L2_PIX_FMT_RGB555X:
                         switch (color) {
                         case 0:
-                                *p = (r_y << 2) | (g_u >> 3);
+                                *p = (alpha & 0x80) | (r_y << 2) | (g_u >> 3);
                                 break;
                         case 1:
                                 *p = (g_u << 5) | b_v;
@@ -479,7 +482,7 @@ static void gen_twopix(struct vivi_dev *dev, u8 *buf, int colorpos, bool odd)
                 case V4L2_PIX_FMT_RGB32:
                         switch (color) {
                         case 0:
-                                *p = 0;
+                                *p = alpha;
                                 break;
                         case 1:
                                 *p = r_y;
@@ -504,7 +507,7 @@ static void gen_twopix(struct vivi_dev *dev, u8 *buf, int colorpos, bool odd)
                                 *p = r_y;
                                 break;
                         case 3:
-                                *p = 0;
+                                *p = alpha;
                                 break;
                         }
                         break;
@@ -595,8 +598,9 @@ static void vivi_fillbuff(struct vivi_dev *dev, struct vivi_buffer *buf)
                         dev->saturation->cur.val,
                         dev->hue->cur.val);
         gen_text(dev, vbuf, line++ * 16, 16, str);
-        snprintf(str, sizeof(str), " autogain %d, gain %3d, volume %3d ",
-                        dev->autogain->cur.val, gain, dev->volume->cur.val);
+        snprintf(str, sizeof(str), " autogain %d, gain %3d, volume %3d, alpha 0x%02x ",
+                        dev->autogain->cur.val, gain, dev->volume->cur.val,
+                        dev->alpha->cur.val);
         gen_text(dev, vbuf, line++ * 16, 16, str);
         snprintf(str, sizeof(str), " int32 %d, int64 %lld, bitmask %08x ",
                         dev->int32->cur.val,
@@ -1125,8 +1129,15 @@ static int vivi_s_ctrl(struct v4l2_ctrl *ctrl)
 {
         struct vivi_dev *dev = container_of(ctrl->handler, struct vivi_dev, ctrl_handler);
 
-        if (ctrl == dev->button)
-                dev->button_pressed = 30;
+        switch (ctrl->id) {
+        case V4L2_CID_ALPHA_COMPONENT:
+                dev->alpha_component = ctrl->val;
+                break;
+        default:
+                if (ctrl == dev->button)
+                        dev->button_pressed = 30;
+                break;
+        }
         return 0;
 }
 
@@ -1387,6 +1398,8 @@ static int __init vivi_create_instance(int inst)
                         V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
         dev->gain = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops,
                         V4L2_CID_GAIN, 0, 255, 1, 100);
+        dev->alpha = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops,
+                        V4L2_CID_ALPHA_COMPONENT, 0, 255, 1, 0);
         dev->button = v4l2_ctrl_new_custom(hdl, &vivi_ctrl_button, NULL);
         dev->int32 = v4l2_ctrl_new_custom(hdl, &vivi_ctrl_int32, NULL);
         dev->int64 = v4l2_ctrl_new_custom(hdl, &vivi_ctrl_int64, NULL);