90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
//
|
|
// em28xx-vbi.c - VBI driver for em28xx
|
|
//
|
|
// Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
|
|
//
|
|
// This work was sponsored by EyeMagnet Limited.
|
|
|
|
#include "em28xx.h"
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/hardirq.h>
|
|
#include <linux/init.h>
|
|
#include <linux/usb.h>
|
|
|
|
#include "em28xx-v4l.h"
|
|
|
|
/* ------------------------------------------------------------------ */
|
|
|
|
static int vbi_queue_setup(struct vb2_queue *vq,
|
|
unsigned int *nbuffers, unsigned int *nplanes,
|
|
unsigned int sizes[], struct device *alloc_devs[])
|
|
{
|
|
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) {
|
|
dev_info(&dev->intf->dev,
|
|
"%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);
|
|
}
|
|
|
|
const 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,
|
|
};
|