cafe_ccic.c

linux 内核源代码

	mutex_lock(&cam->s_mutex);
	if (cam->state != S_STREAMING)
		goto out_unlock;

	cafe_ctlr_stop_dma(cam);
	ret = 0;

  out_unlock:
	mutex_unlock(&cam->s_mutex);
  out:
	return ret;
}



static int cafe_setup_siobuf(struct cafe_camera *cam, int index)
{
	struct cafe_sio_buffer *buf = cam->sb_bufs + index;

	INIT_LIST_HEAD(&buf->list);
	buf->v4lbuf.length = PAGE_ALIGN(cam->pix_format.sizeimage);
	buf->buffer = vmalloc_user(buf->v4lbuf.length);
	if (buf->buffer == NULL)
		return -ENOMEM;
	buf->mapcount = 0;
	buf->cam = cam;

	buf->v4lbuf.index = index;
	buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	buf->v4lbuf.field = V4L2_FIELD_NONE;
	buf->v4lbuf.memory = V4L2_MEMORY_MMAP;
	/*
	 * Offset: must be 32-bit even on a 64-bit system.  videobuf-dma-sg
	 * just uses the length times the index, but the spec warns
	 * against doing just that - vma merging problems.  So we
	 * leave a gap between each pair of buffers.
	 */
	buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length;
	return 0;
}

static int cafe_free_sio_buffers(struct cafe_camera *cam)
{
	int i;

	/*
	 * If any buffers are mapped, we cannot free them at all.
	 */
	for (i = 0; i < cam->n_sbufs; i++)
		if (cam->sb_bufs[i].mapcount > 0)
			return -EBUSY;
	/*
	 * OK, let's do it.
	 */
	for (i = 0; i < cam->n_sbufs; i++)
		vfree(cam->sb_bufs[i].buffer);
	cam->n_sbufs = 0;
	kfree(cam->sb_bufs);
	cam->sb_bufs = NULL;
	INIT_LIST_HEAD(&cam->sb_avail);
	INIT_LIST_HEAD(&cam->sb_full);
	return 0;
}



static int cafe_vidioc_reqbufs(struct file *filp, void *priv,
		struct v4l2_requestbuffers *req)
{
	struct cafe_camera *cam = filp->private_data;
	int ret = 0;  /* Silence warning */

	/*
	 * Make sure it's something we can do.  User pointers could be
	 * implemented without great pain, but that's not been done yet.
	 */
	if (req->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;
	if (req->memory != V4L2_MEMORY_MMAP)
		return -EINVAL;
	/*
	 * If they ask for zero buffers, they really want us to stop streaming
	 * (if it's happening) and free everything.  Should we check owner?
	 */
	mutex_lock(&cam->s_mutex);
	if (req->count == 0) {
		if (cam->state == S_STREAMING)
			cafe_ctlr_stop_dma(cam);
		ret = cafe_free_sio_buffers (cam);
		goto out;
	}
	/*
	 * Device needs to be idle and working.  We *could* try to do the
	 * right thing in S_SPECREAD by shutting things down, but it
	 * probably doesn't matter.
	 */
	if (cam->state != S_IDLE || (cam->owner && cam->owner != filp)) {
		ret = -EBUSY;
		goto out;
	}
	cam->owner = filp;

	if (req->count < min_buffers)
		req->count = min_buffers;
	else if (req->count > max_buffers)
		req->count = max_buffers;
	if (cam->n_sbufs > 0) {
		ret = cafe_free_sio_buffers(cam);
		if (ret)
			goto out;
	}

	cam->sb_bufs = kzalloc(req->count*sizeof(struct cafe_sio_buffer),
			GFP_KERNEL);
	if (cam->sb_bufs == NULL) {
		ret = -ENOMEM;
		goto out;
	}
	for (cam->n_sbufs = 0; cam->n_sbufs < req->count; (cam->n_sbufs++)) {
		ret = cafe_setup_siobuf(cam, cam->n_sbufs);
		if (ret)
			break;
	}

	if (cam->n_sbufs == 0)  /* no luck at all - ret already set */
		kfree(cam->sb_bufs);
	req->count = cam->n_sbufs;  /* In case of partial success */

  out:
	mutex_unlock(&cam->s_mutex);
	return ret;
}


static int cafe_vidioc_querybuf(struct file *filp, void *priv,
		struct v4l2_buffer *buf)
{
	struct cafe_camera *cam = filp->private_data;
	int ret = -EINVAL;

	mutex_lock(&cam->s_mutex);
	if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		goto out;
	if (buf->index < 0 || buf->index >= cam->n_sbufs)
		goto out;
	*buf = cam->sb_bufs[buf->index].v4lbuf;
	ret = 0;
  out:
	mutex_unlock(&cam->s_mutex);
	return ret;
}

static int cafe_vidioc_qbuf(struct file *filp, void *priv,
		struct v4l2_buffer *buf)
{
	struct cafe_camera *cam = filp->private_data;
	struct cafe_sio_buffer *sbuf;
	int ret = -EINVAL;
	unsigned long flags;

	mutex_lock(&cam->s_mutex);
	if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		goto out;
	if (buf->index < 0 || buf->index >= cam->n_sbufs)
		goto out;
	sbuf = cam->sb_bufs + buf->index;
	if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_QUEUED) {
		ret = 0; /* Already queued?? */
		goto out;
	}
	if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_DONE) {
		/* Spec doesn't say anything, seems appropriate tho */
		ret = -EBUSY;
		goto out;
	}
	sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_QUEUED;
	spin_lock_irqsave(&cam->dev_lock, flags);
	list_add(&sbuf->list, &cam->sb_avail);
	spin_unlock_irqrestore(&cam->dev_lock, flags);
	ret = 0;
  out:
	mutex_unlock(&cam->s_mutex);
	return ret;
}

static int cafe_vidioc_dqbuf(struct file *filp, void *priv,
		struct v4l2_buffer *buf)
{
	struct cafe_camera *cam = filp->private_data;
	struct cafe_sio_buffer *sbuf;
	int ret = -EINVAL;
	unsigned long flags;

	mutex_lock(&cam->s_mutex);
	if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		goto out_unlock;
	if (cam->state != S_STREAMING)
		goto out_unlock;
	if (list_empty(&cam->sb_full) && filp->f_flags & O_NONBLOCK) {
		ret = -EAGAIN;
		goto out_unlock;
	}

	while (list_empty(&cam->sb_full) && cam->state == S_STREAMING) {
		mutex_unlock(&cam->s_mutex);
		if (wait_event_interruptible(cam->iowait,
						!list_empty(&cam->sb_full))) {
			ret = -ERESTARTSYS;
			goto out;
		}
		mutex_lock(&cam->s_mutex);
	}

	if (cam->state != S_STREAMING)
		ret = -EINTR;
	else {
		spin_lock_irqsave(&cam->dev_lock, flags);
		/* Should probably recheck !list_empty() here */
		sbuf = list_entry(cam->sb_full.next,
				struct cafe_sio_buffer, list);
		list_del_init(&sbuf->list);
		spin_unlock_irqrestore(&cam->dev_lock, flags);
		sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_DONE;
		*buf = sbuf->v4lbuf;
		ret = 0;
	}

  out_unlock:
	mutex_unlock(&cam->s_mutex);
  out:
	return ret;
}



static void cafe_v4l_vm_open(struct vm_area_struct *vma)
{
	struct cafe_sio_buffer *sbuf = vma->vm_private_data;
	/*
	 * Locking: done under mmap_sem, so we don't need to
	 * go back to the camera lock here.
	 */
	sbuf->mapcount++;
}


static void cafe_v4l_vm_close(struct vm_area_struct *vma)
{
	struct cafe_sio_buffer *sbuf = vma->vm_private_data;

	mutex_lock(&sbuf->cam->s_mutex);
	sbuf->mapcount--;
	/* Docs say we should stop I/O too... */
	if (sbuf->mapcount == 0)
		sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED;
	mutex_unlock(&sbuf->cam->s_mutex);
}

static struct vm_operations_struct cafe_v4l_vm_ops = {
	.open = cafe_v4l_vm_open,
	.close = cafe_v4l_vm_close
};


static int cafe_v4l_mmap(struct file *filp, struct vm_area_struct *vma)
{
	struct cafe_camera *cam = filp->private_data;
	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
	int ret = -EINVAL;
	int i;
	struct cafe_sio_buffer *sbuf = NULL;

	if (! (vma->vm_flags & VM_WRITE) || ! (vma->vm_flags & VM_SHARED))
		return -EINVAL;
	/*
	 * Find the buffer they are looking for.
	 */
	mutex_lock(&cam->s_mutex);
	for (i = 0; i < cam->n_sbufs; i++)
		if (cam->sb_bufs[i].v4lbuf.m.offset == offset) {
			sbuf = cam->sb_bufs + i;
			break;
		}
	if (sbuf == NULL)
		goto out;

	ret = remap_vmalloc_range(vma, sbuf->buffer, 0);
	if (ret)
		goto out;
	vma->vm_flags |= VM_DONTEXPAND;
	vma->vm_private_data = sbuf;
	vma->vm_ops = &cafe_v4l_vm_ops;
	sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED;
	cafe_v4l_vm_open(vma);
	ret = 0;
  out:
	mutex_unlock(&cam->s_mutex);
	return ret;
}



static int cafe_v4l_open(struct inode *inode, struct file *filp)
{
	struct cafe_camera *cam;

	cam = cafe_find_dev(iminor(inode));
	if (cam == NULL)
		return -ENODEV;
	filp->private_data = cam;

	mutex_lock(&cam->s_mutex);
	if (cam->users == 0) {
		cafe_ctlr_power_up(cam);
		__cafe_cam_reset(cam);
		cafe_set_config_needed(cam, 1);
	/* FIXME make sure this is complete */
	}
	(cam->users)++;
	mutex_unlock(&cam->s_mutex);
	return 0;
}


static int cafe_v4l_release(struct inode *inode, struct file *filp)
{
	struct cafe_camera *cam = filp->private_data;

	mutex_lock(&cam->s_mutex);
	(cam->users)--;
	if (filp == cam->owner) {
		cafe_ctlr_stop_dma(cam);
		cafe_free_sio_buffers(cam);
		cam->owner = NULL;
	}
	if (cam->users == 0) {
		cafe_ctlr_power_down(cam);
		if (alloc_bufs_at_read)
			cafe_free_dma_bufs(cam);
	}
	mutex_unlock(&cam->s_mutex);
	return 0;
}



static unsigned int cafe_v4l_poll(struct file *filp,
		struct poll_table_struct *pt)
{
	struct cafe_camera *cam = filp->private_data;

	poll_wait(filp, &cam->iowait, pt);
	if (cam->next_buf >= 0)
		return POLLIN | POLLRDNORM;
	return 0;
}



static int cafe_vidioc_queryctrl(struct file *filp, void *priv,
		struct v4l2_queryctrl *qc)
{
	struct cafe_camera *cam = filp->private_data;
	int ret;

	mutex_lock(&cam->s_mutex);
	ret = __cafe_cam_cmd(cam, VIDIOC_QUERYCTRL, qc);
	mutex_unlock(&cam->s_mutex);
	return ret;
}


static int cafe_vidioc_g_ctrl(struct file *filp, void *priv,
		struct v4l2_control *ctrl)
{
	struct cafe_camera *cam = filp->private_data;
	int ret;

	mutex_lock(&cam->s_mutex);
	ret = __cafe_cam_cmd(cam, VIDIOC_G_CTRL, ctrl);
	mutex_unlock(&cam->s_mutex);
	return ret;
}


static int cafe_vidioc_s_ctrl(struct file *filp, void *priv,
		struct v4l2_control *ctrl)
{
	struct cafe_camera *cam = filp->private_data;
	int ret;

	mutex_lock(&cam->s_mutex);
	ret = __cafe_cam_cmd(cam, VIDIOC_S_CTRL, ctrl);
	mutex_unlock(&cam->s_mutex);
	return ret;
}





static int cafe_vidioc_querycap(struct file *file, void *priv,
		struct v4l2_capability *cap)
{
	strcpy(cap->driver, "cafe_ccic");
	strcpy(cap->card, "cafe_ccic");
	cap->version = CAFE_VERSION;
	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE |
		V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
	return 0;
}


/*
 * The default format we use until somebody says otherwise.
 */
static struct v4l2_pix_format cafe_def_pix_format = {
	.width		= VGA_WIDTH,
	.height		= VGA_HEIGHT,
	.pixelformat	= V4L2_PIX_FMT_YUYV,
	.field		= V4L2_FIELD_NONE,
	.bytesperline	= VGA_WIDTH*2,
	.sizeimage	= VGA_WIDTH*VGA_HEIGHT*2,
};

static int cafe_vidioc_enum_fmt_cap(struct file *filp,
		void *priv, struct v4l2_fmtdesc *fmt)
{
	struct cafe_camera *cam = priv;
	int ret;

	if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;
	mutex_lock(&cam->s_mutex);
	ret = __cafe_cam_cmd(cam, VIDIOC_ENUM_FMT, fmt);
	mutex_unlock(&cam->s_mutex);
	return ret;
}


static int cafe_vidioc_try_fmt_cap (struct file *filp, void *priv,
		struct v4l2_format *fmt)
{
	struct cafe_camera *cam = priv;
	int ret;

	mutex_lock(&cam->s_mutex);
	ret = __cafe_cam_cmd(cam, VIDIOC_TRY_FMT, fmt);
	mutex_unlock(&cam->s_mutex);
	return ret;
}

static int cafe_vidioc_s_fmt_cap(struct file *filp, void *priv,
		struct v4l2_format *fmt)
{
	struct cafe_camera *cam = priv;
	int ret;

	/*
	 * Can't do anything if the device is not idle
	 * Also can't if there are streaming buffers in place.
	 */
	if (cam->state != S_IDLE || cam->n_sbufs > 0)
		return -EBUSY;
	/*
	 * See if the formatting works in principle.
	 */
	ret = cafe_vidioc_try_fmt_cap(filp, priv, fmt);
	if (ret)
		return ret;
	/*
	 * Now we start to change things for real, so let's do it
	 * under lock.
	 */
	mutex_lock(&cam->s_mutex);
	cam->pix_format = fmt->fmt.pix;
	/*
	 * Make sure we have appropriate DMA buffers.
	 */
	ret = -ENOMEM;
	if (cam->nbufs > 0 && cam->dma_buf_size < cam->pix_format.sizeimage)
		cafe_free_dma_bufs(cam);
	if (cam->nbufs == 0) {
		if (cafe_alloc_dma_bufs(cam, 0))
			goto out;
	}
	/*
	 * It looks like this might work, so let's program the sensor.
	 */
	ret = cafe_cam_configure(cam);
	if (! ret)
		ret = cafe_ctlr_configure(cam);
  out:
	mutex_unlock(&cam->s_mutex);
	return ret;
}

/*
 * Return our stored notion of how the camera is/should be configured.
 * The V4l2 spec wants us to be smarter, and actually get this from
 * the camera (and not mess with it at open time).  Someday.
 */
static int cafe_vidioc_g_fmt_cap(struct file *filp, void *priv,
		struct v4l2_format *f)
{
	struct cafe_camera *cam = priv;

	f->fmt.pix = cam->pix_format;
	return 0;
}

/*
 * We only have one input - the sensor - so minimize the nonsense here.
 */
static int cafe_vidioc_enum_input(struct file *filp, void *priv,
		struct v4l2_input *input)
{
	if (input->index != 0)
		return -EINVAL;

	input->type = V4L2_INPUT_TYPE_CAMERA;
	input->std = V4L2_STD_ALL; /* Not sure what should go here */
	strcpy(input->name, "Camera");
	return 0;
}

static int cafe_vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
{
	*i = 0;
	return 0;
}

static int cafe_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
{
	if (i != 0)
		return -EINVAL;
	return 0;
}

/* from vivi.c */
static int cafe_vidioc_s_std(struct file *filp, void *priv, v4l2_std_id *a)
{
	return 0;
}

/*
 * G/S_PARM.  Most of this is done by the sensor, but we are
 * the level which controls the number of read buffers.
 */
static int cafe_vidioc_g_parm(struct file *filp, void *priv,
		struct v4l2_streamparm *parms)
{
	struct cafe_camera *cam = priv;
	int ret;

	mutex_lock(&cam->s_mutex);
	ret = __cafe_cam_cmd(cam, VIDIOC_G_PARM, parms);
	mutex_unlock(&cam->s_mutex);
	parms->parm.capture.readbuffers = n_dma_bufs;
	return ret;
}

static int cafe_vidioc_s_parm(struct file *filp, void *priv,
		struct v4l2_streamparm *parms)
{
	struct cafe_camera *cam = priv;
	int ret;

	mutex_lock(&cam->s_mutex);
	ret = __cafe_cam_cmd(cam, VIDIOC_S_PARM, parms);
	mutex_unlock(&cam->s_mutex);
	parms->parm.capture.readbuffers = n_dma_bufs;
	return ret;
}


static void cafe_v4l_dev_release(struct video_device *vd)
{
	struct cafe_camera *cam = container_of(vd, struct cafe_camera, v4ldev);

	kfree(cam);
}


/*