-static int pwc_video_do_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, void *arg)
-{
- struct video_device *vdev = file->private_data;
- struct pwc_device *pdev;
- DECLARE_WAITQUEUE(wait, current);
-
- if (vdev == NULL)
- return -EFAULT;
- pdev = vdev->priv;
- if (pdev == NULL)
- return -EFAULT;
-
- switch (cmd) {
- /* Query cabapilities */
- case VIDIOCGCAP:
- {
- struct video_capability *caps = arg;
-
- strcpy(caps->name, vdev->name);
- caps->type = VID_TYPE_CAPTURE;
- caps->channels = 1;
- caps->audios = 1;
- caps->minwidth = pdev->view_min.x;
- caps->minheight = pdev->view_min.y;
- caps->maxwidth = pdev->view_max.x;
- caps->maxheight = pdev->view_max.y;
- break;
- }
-
- /* Channel functions (simulate 1 channel) */
- case VIDIOCGCHAN:
- {
- struct video_channel *v = arg;
-
- if (v->channel != 0)
- return -EINVAL;
- v->flags = 0;
- v->tuners = 0;
- v->type = VIDEO_TYPE_CAMERA;
- strcpy(v->name, "Webcam");
- return 0;
- }
-
- case VIDIOCSCHAN:
- {
- /* The spec says the argument is an integer, but
- the bttv driver uses a video_channel arg, which
- makes sense becasue it also has the norm flag.
- */
- struct video_channel *v = arg;
- if (v->channel != 0)
- return -EINVAL;
- return 0;
- }
-
-
- /* Picture functions; contrast etc. */
- case VIDIOCGPICT:
- {
- struct video_picture *p = arg;
- int val;
-
- val = pwc_get_brightness(pdev);
- if (val >= 0)
- p->brightness = val;
- else
- p->brightness = 0xffff;
- val = pwc_get_contrast(pdev);
- if (val >= 0)
- p->contrast = val;
- else
- p->contrast = 0xffff;
- /* Gamma, Whiteness, what's the difference? :) */
- val = pwc_get_gamma(pdev);
- if (val >= 0)
- p->whiteness = val;
- else
- p->whiteness = 0xffff;
- val = pwc_get_saturation(pdev);
- if (val >= 0)
- p->colour = val;
- else
- p->colour = 0xffff;
- p->depth = 24;
- p->palette = pdev->vpalette;
- p->hue = 0xFFFF; /* N/A */
- break;
- }
-
- case VIDIOCSPICT:
- {
- struct video_picture *p = arg;
- /*
- * FIXME: Suppose we are mid read
- ANSWER: No problem: the firmware of the camera
- can handle brightness/contrast/etc
- changes at _any_ time, and the palette
- is used exactly once in the uncompress
- routine.
- */
- pwc_set_brightness(pdev, p->brightness);
- pwc_set_contrast(pdev, p->contrast);
- pwc_set_gamma(pdev, p->whiteness);
- pwc_set_saturation(pdev, p->colour);
- if (p->palette && p->palette != pdev->vpalette) {
- switch (p->palette) {
- case VIDEO_PALETTE_YUV420P:
- case VIDEO_PALETTE_RAW:
- pdev->vpalette = p->palette;
- return pwc_try_video_mode(pdev, pdev->image.x, pdev->image.y, pdev->vframes, pdev->vcompression, pdev->vsnapshot);
- break;
- default:
- return -EINVAL;
- break;
- }
- }
- break;
- }
-
- /* Window/size parameters */
- case VIDIOCGWIN:
- {
- struct video_window *vw = arg;
-
- vw->x = 0;
- vw->y = 0;
- vw->width = pdev->view.x;
- vw->height = pdev->view.y;
- vw->chromakey = 0;
- vw->flags = (pdev->vframes << PWC_FPS_SHIFT) |
- (pdev->vsnapshot ? PWC_FPS_SNAPSHOT : 0);
- break;
- }
-
- case VIDIOCSWIN:
- {
- struct video_window *vw = arg;
- int fps, snapshot, ret;
-
- fps = (vw->flags & PWC_FPS_FRMASK) >> PWC_FPS_SHIFT;
- snapshot = vw->flags & PWC_FPS_SNAPSHOT;
- if (fps == 0)
- fps = pdev->vframes;
- if (pdev->view.x == vw->width && pdev->view.y && fps == pdev->vframes && snapshot == pdev->vsnapshot)
- return 0;
- ret = pwc_try_video_mode(pdev, vw->width, vw->height, fps, pdev->vcompression, snapshot);
- if (ret)
- return ret;
- break;
- }
-
- /* We don't have overlay support (yet) */
- case VIDIOCGFBUF:
- {
- struct video_buffer *vb = arg;
-
- memset(vb,0,sizeof(*vb));
- break;
- }
-
- /* mmap() functions */
- case VIDIOCGMBUF:
- {
- /* Tell the user program how much memory is needed for a mmap() */
- struct video_mbuf *vm = arg;
- int i;
-
- memset(vm, 0, sizeof(*vm));
- vm->size = default_mbufs * pdev->len_per_image;
- vm->frames = default_mbufs; /* double buffering should be enough for most applications */
- for (i = 0; i < default_mbufs; i++)
- vm->offsets[i] = i * pdev->len_per_image;
- break;
- }
-
- case VIDIOCMCAPTURE:
- {
- /* Start capture into a given image buffer (called 'frame' in video_mmap structure) */
- struct video_mmap *vm = arg;
-
- Trace(TRACE_READ, "VIDIOCMCAPTURE: %dx%d, frame %d, format %d\n", vm->width, vm->height, vm->frame, vm->format);
- if (vm->frame < 0 || vm->frame >= default_mbufs)
- return -EINVAL;
-
- /* xawtv is nasty. It probes the available palettes
- by setting a very small image size and trying
- various palettes... The driver doesn't support
- such small images, so I'm working around it.
- */
- if (vm->format)
- {
- switch (vm->format)
- {
- case VIDEO_PALETTE_YUV420P:
- case VIDEO_PALETTE_RAW:
- break;
- default:
- return -EINVAL;
- break;
- }
- }
-
- if ((vm->width != pdev->view.x || vm->height != pdev->view.y) &&
- (vm->width >= pdev->view_min.x && vm->height >= pdev->view_min.y)) {
- int ret;
-
- Trace(TRACE_OPEN, "VIDIOCMCAPTURE: changing size to please xawtv :-(.\n");
- ret = pwc_try_video_mode(pdev, vm->width, vm->height, pdev->vframes, pdev->vcompression, pdev->vsnapshot);
- if (ret)
- return ret;
- } /* ... size mismatch */
-
- /* FIXME: should we lock here? */
- if (pdev->image_used[vm->frame])
- return -EBUSY; /* buffer wasn't available. Bummer */
- pdev->image_used[vm->frame] = 1;
-
- /* Okay, we're done here. In the SYNC call we wait until a
- frame comes available, then expand image into the given
- buffer.
- In contrast to the CPiA cam the Philips cams deliver a
- constant stream, almost like a grabber card. Also,
- we have separate buffers for the rawdata and the image,
- meaning we can nearly always expand into the requested buffer.
- */
- Trace(TRACE_READ, "VIDIOCMCAPTURE done.\n");
- break;
- }
-
- case VIDIOCSYNC:
- {
- /* The doc says: "Whenever a buffer is used it should
- call VIDIOCSYNC to free this frame up and continue."
-
- The only odd thing about this whole procedure is
- that MCAPTURE flags the buffer as "in use", and
- SYNC immediately unmarks it, while it isn't
- after SYNC that you know that the buffer actually
- got filled! So you better not start a CAPTURE in
- the same frame immediately (use double buffering).
- This is not a problem for this cam, since it has
- extra intermediate buffers, but a hardware
- grabber card will then overwrite the buffer
- you're working on.
- */
- int *mbuf = arg;
- int ret;
-
- Trace(TRACE_READ, "VIDIOCSYNC called (%d).\n", *mbuf);
-
- /* bounds check */
- if (*mbuf < 0 || *mbuf >= default_mbufs)
- return -EINVAL;
- /* check if this buffer was requested anyway */
- if (pdev->image_used[*mbuf] == 0)
- return -EINVAL;
-
- /* Add ourselves to the frame wait-queue.
-
- FIXME: needs auditing for safety.
- QUESTION: In what respect? I think that using the
- frameq is safe now.
- */
- add_wait_queue(&pdev->frameq, &wait);
- while (pdev->full_frames == NULL) {
- if (pdev->error_status) {
- remove_wait_queue(&pdev->frameq, &wait);
- set_current_state(TASK_RUNNING);
- return -pdev->error_status;
- }
-
- if (signal_pending(current)) {
- remove_wait_queue(&pdev->frameq, &wait);
- set_current_state(TASK_RUNNING);
- return -ERESTARTSYS;
- }
- schedule();
- set_current_state(TASK_INTERRUPTIBLE);
- }
- remove_wait_queue(&pdev->frameq, &wait);
- set_current_state(TASK_RUNNING);
-
- /* The frame is ready. Expand in the image buffer
- requested by the user. I don't care if you
- mmap() 5 buffers and request data in this order:
- buffer 4 2 3 0 1 2 3 0 4 3 1 . . .
- Grabber hardware may not be so forgiving.
- */
- Trace(TRACE_READ, "VIDIOCSYNC: frame ready.\n");
- pdev->fill_image = *mbuf; /* tell in which buffer we want the image to be expanded */
- /* Decompress, etc */
- ret = pwc_handle_frame(pdev);
- pdev->image_used[*mbuf] = 0;
- if (ret)
- return -EFAULT;
- break;
- }
-
- case VIDIOCGAUDIO:
- {
- struct video_audio *v = arg;
-
- strcpy(v->name, "Microphone");
- v->audio = -1; /* unknown audio minor */
- v->flags = 0;
- v->mode = VIDEO_SOUND_MONO;
- v->volume = 0;
- v->bass = 0;
- v->treble = 0;
- v->balance = 0x8000;
- v->step = 1;
- break;
- }
-
- case VIDIOCSAUDIO:
- {
- /* Dummy: nothing can be set */
- break;
- }
-
- case VIDIOCGUNIT:
- {
- struct video_unit *vu = arg;
-
- vu->video = pdev->vdev->minor & 0x3F;
- vu->audio = -1; /* not known yet */
- vu->vbi = -1;
- vu->radio = -1;
- vu->teletext = -1;
- break;
- }
- default:
- return pwc_ioctl(pdev, cmd, arg);
- } /* ..switch */
- return 0;
-}
-