diff options
Diffstat (limited to 'drivers/media/video/v4l1-compat.c')
| -rw-r--r-- | drivers/media/video/v4l1-compat.c | 62 |
1 files changed, 45 insertions, 17 deletions
diff --git a/drivers/media/video/v4l1-compat.c b/drivers/media/video/v4l1-compat.c index a861e150865e..ede8543818bf 100644 --- a/drivers/media/video/v4l1-compat.c +++ b/drivers/media/video/v4l1-compat.c @@ -127,7 +127,7 @@ set_v4l_control(struct inode *inode, /* ----------------------------------------------------------------- */ -static int palette2pixelformat[] = { +const static unsigned int palette2pixelformat[] = { [VIDEO_PALETTE_GREY] = V4L2_PIX_FMT_GREY, [VIDEO_PALETTE_RGB555] = V4L2_PIX_FMT_RGB555, [VIDEO_PALETTE_RGB565] = V4L2_PIX_FMT_RGB565, @@ -145,7 +145,7 @@ static int palette2pixelformat[] = { [VIDEO_PALETTE_YUV422P] = V4L2_PIX_FMT_YUV422P, }; -static unsigned int +static unsigned int __attribute_pure__ palette_to_pixelformat(unsigned int palette) { if (palette < ARRAY_SIZE(palette2pixelformat)) @@ -154,8 +154,8 @@ palette_to_pixelformat(unsigned int palette) return 0; } -static unsigned int -pixelformat_to_palette(int pixelformat) +static unsigned int __attribute_const__ +pixelformat_to_palette(unsigned int pixelformat) { int palette = 0; switch (pixelformat) @@ -616,6 +616,8 @@ v4l_compat_translate_ioctl(struct inode *inode, case VIDIOCSPICT: /* set tone controls & partial capture format */ { struct video_picture *pict = arg; + int mem_err = 0, ovl_err = 0; + memset(&fbuf2, 0, sizeof(fbuf2)); set_v4l_control(inode, file, @@ -628,33 +630,59 @@ v4l_compat_translate_ioctl(struct inode *inode, V4L2_CID_SATURATION, pict->colour, drv); set_v4l_control(inode, file, V4L2_CID_WHITENESS, pict->whiteness, drv); + /* + * V4L1 uses this ioctl to set both memory capture and overlay + * pixel format, while V4L2 has two different ioctls for this. + * Some cards may not support one or the other, and may support + * different pixel formats for memory vs overlay. + */ fmt2 = kzalloc(sizeof(*fmt2),GFP_KERNEL); fmt2->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; err = drv(inode, file, VIDIOC_G_FMT, fmt2); - if (err < 0) + /* If VIDIOC_G_FMT failed, then the driver likely doesn't + support memory capture. Trying to set the memory capture + parameters would be pointless. */ + if (err < 0) { dprintk("VIDIOCSPICT / VIDIOC_G_FMT: %d\n",err); - if (fmt2->fmt.pix.pixelformat != - palette_to_pixelformat(pict->palette)) { + mem_err = -1000; /* didn't even try */ + } else if (fmt2->fmt.pix.pixelformat != + palette_to_pixelformat(pict->palette)) { fmt2->fmt.pix.pixelformat = palette_to_pixelformat( pict->palette); - err = drv(inode, file, VIDIOC_S_FMT, fmt2); - if (err < 0) - dprintk("VIDIOCSPICT / VIDIOC_S_FMT: %d\n",err); + mem_err = drv(inode, file, VIDIOC_S_FMT, fmt2); + if (mem_err < 0) + dprintk("VIDIOCSPICT / VIDIOC_S_FMT: %d\n", + mem_err); } err = drv(inode, file, VIDIOC_G_FBUF, &fbuf2); - if (err < 0) + /* If VIDIOC_G_FBUF failed, then the driver likely doesn't + support overlay. Trying to set the overlay parameters + would be quite pointless. */ + if (err < 0) { dprintk("VIDIOCSPICT / VIDIOC_G_FBUF: %d\n",err); - if (fbuf2.fmt.pixelformat != - palette_to_pixelformat(pict->palette)) { + ovl_err = -1000; /* didn't even try */ + } else if (fbuf2.fmt.pixelformat != + palette_to_pixelformat(pict->palette)) { fbuf2.fmt.pixelformat = palette_to_pixelformat( pict->palette); - err = drv(inode, file, VIDIOC_S_FBUF, &fbuf2); - if (err < 0) - dprintk("VIDIOCSPICT / VIDIOC_S_FBUF: %d\n",err); - err = 0; /* likely fails for non-root */ + ovl_err = drv(inode, file, VIDIOC_S_FBUF, &fbuf2); + if (ovl_err < 0) + dprintk("VIDIOCSPICT / VIDIOC_S_FBUF: %d\n", + ovl_err); } + if (ovl_err < 0 && mem_err < 0) + /* ioctl failed, couldn't set either parameter */ + if (mem_err != -1000) { + err = mem_err; + } else if (ovl_err == -EPERM) { + err = 0; + } else { + err = ovl_err; + } + else + err = 0; break; } case VIDIOCGTUNER: /* get tuner information */ |