blob: fe94c9225dd7f18ce413f56347551bc7de961688 [file] [log] [blame]
em28xx-vbi.c - VBI driver for em28xx
Copyright (C) 2009 Devin Heitmueller <>
This work was sponsored by EyeMagnet Limited.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/hardirq.h>
#include <linux/init.h>
#include "em28xx.h"
#include "em28xx-v4l.h"
/* ------------------------------------------------------------------ */
static int vbi_queue_setup(struct vb2_queue *vq,
unsigned int *nbuffers, unsigned int *nplanes,
unsigned int sizes[], void *alloc_ctxs[])
struct em28xx *dev = vb2_get_drv_priv(vq);
struct em28xx_v4l2 *v4l2 = dev->v4l2;
unsigned long size = v4l2->vbi_width * v4l2->vbi_height * 2;
if (*nbuffers < 2)
*nbuffers = 2;
if (*nplanes) {
if (sizes[0] < size)
return -EINVAL;
size = sizes[0];
*nplanes = 1;
sizes[0] = size;
return 0;
static int vbi_buffer_prepare(struct vb2_buffer *vb)
struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
struct em28xx_v4l2 *v4l2 = dev->v4l2;
unsigned long size;
size = v4l2->vbi_width * v4l2->vbi_height * 2;
if (vb2_plane_size(vb, 0) < size) {
printk(KERN_INFO "%s data will not fit into plane (%lu < %lu)\n",
__func__, vb2_plane_size(vb, 0), size);
return -EINVAL;
vb2_set_plane_payload(vb, 0, size);
return 0;
static void
vbi_buffer_queue(struct vb2_buffer *vb)
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
struct em28xx_buffer *buf =
container_of(vbuf, struct em28xx_buffer, vb);
struct em28xx_dmaqueue *vbiq = &dev->vbiq;
unsigned long flags = 0;
buf->mem = vb2_plane_vaddr(vb, 0);
buf->length = vb2_plane_size(vb, 0);
spin_lock_irqsave(&dev->slock, flags);
list_add_tail(&buf->list, &vbiq->active);
spin_unlock_irqrestore(&dev->slock, flags);
struct vb2_ops em28xx_vbi_qops = {
.queue_setup = vbi_queue_setup,
.buf_prepare = vbi_buffer_prepare,
.buf_queue = vbi_buffer_queue,
.start_streaming = em28xx_start_analog_streaming,
.stop_streaming = em28xx_stop_vbi_streaming,
.wait_prepare = vb2_ops_wait_prepare,
.wait_finish = vb2_ops_wait_finish,