cpia2_v4l.c

V4l driver for DVB HD

			c->flags |= V4L2_CTRL_FLAG_DISABLED;
		break;
	case CPIA2_CID_LIGHTS:
		// Light control only valid for the QX5 Microscope.
		if(cam->params.pnp_id.product != 0x151)
			c->flags |= V4L2_CTRL_FLAG_DISABLED;
		break;
	default:
		break;
	}

	return 0;
}

/******************************************************************************
 *
 *  ioctl_querymenu
 *
 *  V4L2 query possible control variables
 *
 *****************************************************************************/

static int ioctl_querymenu(void *arg,struct camera_data *cam)
{
	struct v4l2_querymenu *m = arg;

	memset(m->name, 0, sizeof(m->name));
	m->reserved = 0;

	switch(m->id) {
	case CPIA2_CID_FLICKER_MODE:
		if(m->index < 0 || m->index >= NUM_FLICKER_CONTROLS)
			return -EINVAL;

		strcpy(m->name, flicker_controls[m->index].name);
		break;
	case CPIA2_CID_FRAMERATE:
	    {
		int maximum = NUM_FRAMERATE_CONTROLS - 1;
		if(cam->params.pnp_id.device_type == DEVICE_STV_672 &&
		   cam->params.version.sensor_flags==CPIA2_VP_SENSOR_FLAGS_500){
			// Maximum 15fps
			int i;
			for(i=0; i<maximum; ++i) {
				if(framerate_controls[i].value ==
				   CPIA2_VP_FRAMERATE_15)
					maximum = i;
			}
		}
		if(m->index < 0 || m->index > maximum)
			return -EINVAL;

		strcpy(m->name, framerate_controls[m->index].name);
		break;
	    }
	case CPIA2_CID_LIGHTS:
		if(m->index < 0 || m->index >= NUM_LIGHTS_CONTROLS)
			return -EINVAL;

		strcpy(m->name, lights_controls[m->index].name);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

/******************************************************************************
 *
 *  ioctl_g_ctrl
 *
 *  V4L2 get the value of a control variable
 *
 *****************************************************************************/

static int ioctl_g_ctrl(void *arg,struct camera_data *cam)
{
	struct v4l2_control *c = arg;

	switch(c->id) {
	case V4L2_CID_BRIGHTNESS:
		cpia2_do_command(cam, CPIA2_CMD_GET_VP_BRIGHTNESS,
				 TRANSFER_READ, 0);
		c->value = cam->params.color_params.brightness;
		break;
	case V4L2_CID_CONTRAST:
		cpia2_do_command(cam, CPIA2_CMD_GET_CONTRAST,
				 TRANSFER_READ, 0);
		c->value = cam->params.color_params.contrast;
		break;
	case V4L2_CID_SATURATION:
		cpia2_do_command(cam, CPIA2_CMD_GET_VP_SATURATION,
				 TRANSFER_READ, 0);
		c->value = cam->params.color_params.saturation;
		break;
	case V4L2_CID_HFLIP:
		cpia2_do_command(cam, CPIA2_CMD_GET_USER_EFFECTS,
				 TRANSFER_READ, 0);
		c->value = (cam->params.vp_params.user_effects &
			    CPIA2_VP_USER_EFFECTS_MIRROR) != 0;
		break;
	case V4L2_CID_VFLIP:
		cpia2_do_command(cam, CPIA2_CMD_GET_USER_EFFECTS,
				 TRANSFER_READ, 0);
		c->value = (cam->params.vp_params.user_effects &
			    CPIA2_VP_USER_EFFECTS_FLIP) != 0;
		break;
	case CPIA2_CID_TARGET_KB:
		c->value = cam->params.vc_params.target_kb;
		break;
	case CPIA2_CID_GPIO:
		cpia2_do_command(cam, CPIA2_CMD_GET_VP_GPIO_DATA,
				 TRANSFER_READ, 0);
		c->value = cam->params.vp_params.gpio_data;
		break;
	case CPIA2_CID_FLICKER_MODE:
	{
		int i, mode;
		cpia2_do_command(cam, CPIA2_CMD_GET_FLICKER_MODES,
				 TRANSFER_READ, 0);
		if(cam->params.flicker_control.cam_register &
		   CPIA2_VP_FLICKER_MODES_NEVER_FLICKER) {
			mode = NEVER_FLICKER;
		} else {
		    if(cam->params.flicker_control.cam_register &
		       CPIA2_VP_FLICKER_MODES_50HZ) {
		    	mode = FLICKER_50;
		    } else {
		    	mode = FLICKER_60;
		    }
		}
		for(i=0; i<NUM_FLICKER_CONTROLS; i++) {
			if(flicker_controls[i].value == mode) {
				c->value = i;
				break;
			}
		}
		if(i == NUM_FLICKER_CONTROLS)
			return -EINVAL;
		break;
	}
	case CPIA2_CID_FRAMERATE:
	{
		int maximum = NUM_FRAMERATE_CONTROLS - 1;
		int i;
		for(i=0; i<= maximum; i++) {
			if(cam->params.vp_params.frame_rate ==
			   framerate_controls[i].value)
				break;
		}
		if(i > maximum)
			return -EINVAL;
		c->value = i;
		break;
	}
	case CPIA2_CID_USB_ALT:
		c->value = cam->params.camera_state.stream_mode;
		break;
	case CPIA2_CID_LIGHTS:
	{
		int i;
		cpia2_do_command(cam, CPIA2_CMD_GET_VP_GPIO_DATA,
				 TRANSFER_READ, 0);
		for(i=0; i<NUM_LIGHTS_CONTROLS; i++) {
			if((cam->params.vp_params.gpio_data&GPIO_LIGHTS_MASK) ==
			   lights_controls[i].value) {
				break;
			}
		}
		if(i == NUM_LIGHTS_CONTROLS)
			return -EINVAL;
		c->value = i;
		break;
	}
	case CPIA2_CID_RESET_CAMERA:
		return -EINVAL;
	default:
		return -EINVAL;
	}

	DBG("Get control id:%d, value:%d\n", c->id, c->value);

	return 0;
}

/******************************************************************************
 *
 *  ioctl_s_ctrl
 *
 *  V4L2 set the value of a control variable
 *
 *****************************************************************************/

static int ioctl_s_ctrl(void *arg,struct camera_data *cam)
{
	struct v4l2_control *c = arg;
	int i;
	int retval = 0;

	DBG("Set control id:%d, value:%d\n", c->id, c->value);

	/* Check that the value is in range */
	for(i=0; i<NUM_CONTROLS; i++) {
		if(c->id == controls[i].id) {
			if(c->value < controls[i].minimum ||
			   c->value > controls[i].maximum) {
				return -EINVAL;
			}
			break;
		}
	}
	if(i == NUM_CONTROLS)
		return -EINVAL;

	switch(c->id) {
	case V4L2_CID_BRIGHTNESS:
		cpia2_set_brightness(cam, c->value);
		break;
	case V4L2_CID_CONTRAST:
		cpia2_set_contrast(cam, c->value);
		break;
	case V4L2_CID_SATURATION:
		cpia2_set_saturation(cam, c->value);
		break;
	case V4L2_CID_HFLIP:
		cpia2_set_property_mirror(cam, c->value);
		break;
	case V4L2_CID_VFLIP:
		cpia2_set_property_flip(cam, c->value);
		break;
	case CPIA2_CID_TARGET_KB:
		retval = cpia2_set_target_kb(cam, c->value);
		break;
	case CPIA2_CID_GPIO:
		retval = cpia2_set_gpio(cam, c->value);
		break;
	case CPIA2_CID_FLICKER_MODE:
		retval = cpia2_set_flicker_mode(cam,
					      flicker_controls[c->value].value);
		break;
	case CPIA2_CID_FRAMERATE:
		retval = cpia2_set_fps(cam, framerate_controls[c->value].value);
		break;
	case CPIA2_CID_USB_ALT:
		retval = cpia2_usb_change_streaming_alternate(cam, c->value);
		break;
	case CPIA2_CID_LIGHTS:
		retval = cpia2_set_gpio(cam, lights_controls[c->value].value);
		break;
	case CPIA2_CID_RESET_CAMERA:
		cpia2_usb_stream_pause(cam);
		cpia2_reset_camera(cam);
		cpia2_usb_stream_resume(cam);
		break;
	default:
		retval = -EINVAL;
	}

	return retval;
}

/******************************************************************************
 *
 *  ioctl_g_jpegcomp
 *
 *  V4L2 get the JPEG compression parameters
 *
 *****************************************************************************/

static int ioctl_g_jpegcomp(void *arg,struct camera_data *cam)
{
	struct v4l2_jpegcompression *parms = arg;

	memset(parms, 0, sizeof(*parms));

	parms->quality = 80; // TODO: Can this be made meaningful?

	parms->jpeg_markers = V4L2_JPEG_MARKER_DQT | V4L2_JPEG_MARKER_DRI;
	if(!cam->params.compression.inhibit_htables) {
		parms->jpeg_markers |= V4L2_JPEG_MARKER_DHT;
	}

	parms->APPn = cam->APPn;
	parms->APP_len = cam->APP_len;
	if(cam->APP_len > 0) {
		memcpy(parms->APP_data, cam->APP_data, cam->APP_len);
		parms->jpeg_markers |= V4L2_JPEG_MARKER_APP;
	}

	parms->COM_len = cam->COM_len;
	if(cam->COM_len > 0) {
		memcpy(parms->COM_data, cam->COM_data, cam->COM_len);
		parms->jpeg_markers |= JPEG_MARKER_COM;
	}

	DBG("G_JPEGCOMP APP_len:%d COM_len:%d\n",
	    parms->APP_len, parms->COM_len);

	return 0;
}

/******************************************************************************
 *
 *  ioctl_s_jpegcomp
 *
 *  V4L2 set the JPEG compression parameters
 *  NOTE: quality and some jpeg_markers are ignored.
 *
 *****************************************************************************/

static int ioctl_s_jpegcomp(void *arg,struct camera_data *cam)
{
	struct v4l2_jpegcompression *parms = arg;

	DBG("S_JPEGCOMP APP_len:%d COM_len:%d\n",
	    parms->APP_len, parms->COM_len);

	cam->params.compression.inhibit_htables =
		!(parms->jpeg_markers & V4L2_JPEG_MARKER_DHT);

	if(parms->APP_len != 0) {
		if(parms->APP_len > 0 &&
		   parms->APP_len <= sizeof(cam->APP_data) &&
		   parms->APPn >= 0 && parms->APPn <= 15) {
			cam->APPn = parms->APPn;
			cam->APP_len = parms->APP_len;
			memcpy(cam->APP_data, parms->APP_data, parms->APP_len);
		} else {
			LOG("Bad APPn Params n=%d len=%d\n",
			    parms->APPn, parms->APP_len);
			return -EINVAL;
		}
	} else {
		cam->APP_len = 0;
	}

	if(parms->COM_len != 0) {
		if(parms->COM_len > 0 &&
		   parms->COM_len <= sizeof(cam->COM_data)) {
			cam->COM_len = parms->COM_len;
			memcpy(cam->COM_data, parms->COM_data, parms->COM_len);
		} else {
			LOG("Bad COM_len=%d\n", parms->COM_len);
			return -EINVAL;
		}
	}

	return 0;
}

/******************************************************************************
 *
 *  ioctl_reqbufs
 *
 *  V4L2 Initiate memory mapping.
 *  NOTE: The user's request is ignored. For now the buffers are fixed.
 *
 *****************************************************************************/

static int ioctl_reqbufs(void *arg,struct camera_data *cam)
{
	struct v4l2_requestbuffers *req = arg;

	if(req->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
	   req->memory != V4L2_MEMORY_MMAP)
		return -EINVAL;

	DBG("REQBUFS requested:%d returning:%d\n", req->count, cam->num_frames);
	req->count = cam->num_frames;
	memset(&req->reserved, 0, sizeof(req->reserved));

	return 0;
}

/******************************************************************************
 *
 *  ioctl_querybuf
 *
 *  V4L2 Query memory buffer status.
 *
 *****************************************************************************/

static int ioctl_querybuf(void *arg,struct camera_data *cam)
{
	struct v4l2_buffer *buf = arg;

	if(buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
	   buf->index > cam->num_frames)
		return -EINVAL;

	buf->m.offset = cam->buffers[buf->index].data - cam->frame_buffer;
	buf->length = cam->frame_size;

	buf->memory = V4L2_MEMORY_MMAP;

	if(cam->mmapped)
		buf->flags = V4L2_BUF_FLAG_MAPPED;
	else
		buf->flags = 0;

	switch (cam->buffers[buf->index].status) {
	case FRAME_EMPTY:
	case FRAME_ERROR:
	case FRAME_READING:
		buf->bytesused = 0;
		buf->flags = V4L2_BUF_FLAG_QUEUED;
		break;
	case FRAME_READY:
		buf->bytesused = cam->buffers[buf->index].length;
		buf->timestamp = cam->buffers[buf->index].timestamp;
		buf->sequence = cam->buffers[buf->index].seq;
		buf->flags = V4L2_BUF_FLAG_DONE;
		break;
	}

	DBG("QUERYBUF index:%d offset:%d flags:%d seq:%d bytesused:%d\n",
	     buf->index, buf->m.offset, buf->flags, buf->sequence,
	     buf->bytesused);

	return 0;
}

/******************************************************************************
 *
 *  ioctl_qbuf
 *
 *  V4L2 User is freeing buffer
 *
 *****************************************************************************/

static int ioctl_qbuf(void *arg,struct camera_data *cam)
{
	struct v4l2_buffer *buf = arg;

	if(buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
	   buf->memory != V4L2_MEMORY_MMAP ||
	   buf->index > cam->num_frames)
		return -EINVAL;

	DBG("QBUF #%d\n", buf->index);

	if(cam->buffers[buf->index].status == FRAME_READY)
		cam->buffers[buf->index].status = FRAME_EMPTY;

	return 0;
}

/******************************************************************************
 *
 *  find_earliest_filled_buffer
 *
 *  Helper for ioctl_dqbuf. Find the next ready buffer.
 *
 *****************************************************************************/

static int find_earliest_filled_buffer(struct camera_data *cam)
{
	int i;
	int found = -1;
	for (i=0; i<cam->num_frames; i++) {
		if(cam->buffers[i].status == FRAME_READY) {
			if(found < 0) {
				found = i;
			} else {
				/* find which buffer is earlier */
				struct timeval *tv1, *tv2;
				tv1 = &cam->buffers[i].timestamp;
				tv2 = &cam->buffers[found].timestamp;
				if(tv1->tv_sec < tv2->tv_sec ||
				   (tv1->tv_sec == tv2->tv_sec &&
				    tv1->tv_usec < tv2->tv_usec))
					found = i;
			}
		}
	}
	return found;
}

/******************************************************************************
 *
 *  ioctl_dqbuf
 *
 *  V4L2 User is asking for a filled buffer.
 *
 *****************************************************************************/

static int ioctl_dqbuf(void *arg,struct camera_data *cam, struct file *file)
{
	struct v4l2_buffer *buf = arg;
	int frame;

	if(buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
	   buf->memory != V4L2_MEMORY_MMAP)
		return -EINVAL;

	frame = find_earliest_filled_buffer(cam);

	if(frame < 0 && file->f_flags&O_NONBLOCK)
		return -EAGAIN;

	if(frame < 0) {
		/* Wait for a frame to become available */
		struct framebuf *cb=cam->curbuff;
		mutex_unlock(&cam->busy_lock);
		wait_event_interruptible(cam->wq_stream,
					 !cam->present ||
					 (cb=cam->curbuff)->status == FRAME_READY);
		mutex_lock(&cam->busy_lock);
		if (signal_pending(current))
			return -ERESTARTSYS;
		if(!cam->present)
			return -ENOTTY;
		frame = cb->num;
	}


	buf->index = frame;
	buf->bytesused = cam->buffers[buf->index].length;
	buf->flags = V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_DONE;
	buf->field = V4L2_FIELD_NONE;