706 	struct usbvision_frame *frame;  in vidioc_querybuf()  local
714 	frame = &usbvision->frame[vb->index];  in vidioc_querybuf()
715 	if (frame->grabstate >= frame_state_ready)  in vidioc_querybuf()
717 	if (frame->grabstate >= frame_state_done)  in vidioc_querybuf()
719 	if (frame->grabstate == frame_state_unused)  in vidioc_querybuf()
730 	vb->timestamp = usbvision->frame[vb->index].timestamp;  in vidioc_querybuf()
731 	vb->sequence = usbvision->frame[vb->index].sequence;  in vidioc_querybuf()
738 	struct usbvision_frame *frame;  in vidioc_qbuf()  local
745 	frame = &usbvision->frame[vb->index];  in vidioc_qbuf()
747 	if (frame->grabstate != frame_state_unused)  in vidioc_qbuf()
751 	frame->grabstate = frame_state_ready;  in vidioc_qbuf()
752 	frame->scanstate = scan_state_scanning;  in vidioc_qbuf()
753 	frame->scanlength = 0;	/* Accumulated in usbvision_parse_data() */  in vidioc_qbuf()
758 	frame->v4l2_format = usbvision->palette;  in vidioc_qbuf()
761 	list_add_tail(&usbvision->frame[vb->index].frame, &usbvision->inqueue);  in vidioc_qbuf()
786 		       struct usbvision_frame, frame);  in vidioc_dqbuf()
923 	struct usbvision_frame *frame;  in usbvision_read()  local
951 		frame = &usbvision->frame[i];  in usbvision_read()
952 		if (frame->grabstate == frame_state_unused) {  in usbvision_read()
954 			frame->grabstate = frame_state_ready;  in usbvision_read()
955 			frame->scanstate = scan_state_scanning;  in usbvision_read()
957 			frame->scanlength = 0;  in usbvision_read()
960 			frame->v4l2_format = usbvision->palette;  in usbvision_read()
963 			list_add_tail(&frame->frame, &usbvision->inqueue);  in usbvision_read()
982 	frame = list_entry(usbvision->outqueue.next,  in usbvision_read()
983 			   struct usbvision_frame, frame);  in usbvision_read()
988 	if (frame->grabstate == frame_state_error) {  in usbvision_read()
989 		frame->bytes_read = 0;  in usbvision_read()
995 	       frame->index, frame->bytes_read, frame->scanlength);  in usbvision_read()
998 	if ((count + frame->bytes_read) > (unsigned long)frame->scanlength)  in usbvision_read()
999 		count = frame->scanlength - frame->bytes_read;  in usbvision_read()
1001 	if (copy_to_user(buf, frame->data + frame->bytes_read, count))  in usbvision_read()
1004 	frame->bytes_read += count;  in usbvision_read()
1007 	       (unsigned long)count, frame->bytes_read);  in usbvision_read()
1014 	frame->bytes_read = 0;  in usbvision_read()
1017 	frame->grabstate = frame_state_unused;  in usbvision_read()
1019 	if (frame->bytes_read >= frame->scanlength) {  in usbvision_read()
1021 		frame->bytes_read = 0;  in usbvision_read()
1024 		frame->grabstate = frame_state_unused;  in usbvision_read()
1076 	pos = usbvision->frame[i].data;  in usbvision_mmap()