mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 01:54:09 +08:00
0c0d06cac6
Rename all USB drivers with their own directory under drivers/media/video into drivers/media/usb and update the building system. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
146 lines
4.1 KiB
C
146 lines
4.1 KiB
C
/*
|
|
em28xx-vbi.c - VBI driver for em28xx
|
|
|
|
Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
|
|
|
|
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
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
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"
|
|
|
|
static unsigned int vbibufs = 5;
|
|
module_param(vbibufs, int, 0644);
|
|
MODULE_PARM_DESC(vbibufs, "number of vbi buffers, range 2-32");
|
|
|
|
static unsigned int vbi_debug;
|
|
module_param(vbi_debug, int, 0644);
|
|
MODULE_PARM_DESC(vbi_debug, "enable debug messages [vbi]");
|
|
|
|
#define dprintk(level, fmt, arg...) if (vbi_debug >= level) \
|
|
printk(KERN_DEBUG "%s: " fmt, dev->core->name , ## arg)
|
|
|
|
/* ------------------------------------------------------------------ */
|
|
|
|
static void
|
|
free_buffer(struct videobuf_queue *vq, struct em28xx_buffer *buf)
|
|
{
|
|
struct em28xx_fh *fh = vq->priv_data;
|
|
struct em28xx *dev = fh->dev;
|
|
unsigned long flags = 0;
|
|
if (in_interrupt())
|
|
BUG();
|
|
|
|
/* We used to wait for the buffer to finish here, but this didn't work
|
|
because, as we were keeping the state as VIDEOBUF_QUEUED,
|
|
videobuf_queue_cancel marked it as finished for us.
|
|
(Also, it could wedge forever if the hardware was misconfigured.)
|
|
|
|
This should be safe; by the time we get here, the buffer isn't
|
|
queued anymore. If we ever start marking the buffers as
|
|
VIDEOBUF_ACTIVE, it won't be, though.
|
|
*/
|
|
spin_lock_irqsave(&dev->slock, flags);
|
|
if (dev->isoc_ctl.vbi_buf == buf)
|
|
dev->isoc_ctl.vbi_buf = NULL;
|
|
spin_unlock_irqrestore(&dev->slock, flags);
|
|
|
|
videobuf_vmalloc_free(&buf->vb);
|
|
buf->vb.state = VIDEOBUF_NEEDS_INIT;
|
|
}
|
|
|
|
static int
|
|
vbi_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
|
|
{
|
|
struct em28xx_fh *fh = q->priv_data;
|
|
struct em28xx *dev = fh->dev;
|
|
|
|
*size = dev->vbi_width * dev->vbi_height * 2;
|
|
|
|
if (0 == *count)
|
|
*count = vbibufs;
|
|
if (*count < 2)
|
|
*count = 2;
|
|
if (*count > 32)
|
|
*count = 32;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
vbi_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
|
|
enum v4l2_field field)
|
|
{
|
|
struct em28xx_fh *fh = q->priv_data;
|
|
struct em28xx *dev = fh->dev;
|
|
struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
|
|
int rc = 0;
|
|
|
|
buf->vb.size = dev->vbi_width * dev->vbi_height * 2;
|
|
|
|
if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
|
|
return -EINVAL;
|
|
|
|
buf->vb.width = dev->vbi_width;
|
|
buf->vb.height = dev->vbi_height;
|
|
buf->vb.field = field;
|
|
|
|
if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
|
|
rc = videobuf_iolock(q, &buf->vb, NULL);
|
|
if (rc < 0)
|
|
goto fail;
|
|
}
|
|
|
|
buf->vb.state = VIDEOBUF_PREPARED;
|
|
return 0;
|
|
|
|
fail:
|
|
free_buffer(q, buf);
|
|
return rc;
|
|
}
|
|
|
|
static void
|
|
vbi_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
|
|
{
|
|
struct em28xx_buffer *buf = container_of(vb,
|
|
struct em28xx_buffer,
|
|
vb);
|
|
struct em28xx_fh *fh = vq->priv_data;
|
|
struct em28xx *dev = fh->dev;
|
|
struct em28xx_dmaqueue *vbiq = &dev->vbiq;
|
|
|
|
buf->vb.state = VIDEOBUF_QUEUED;
|
|
list_add_tail(&buf->vb.queue, &vbiq->active);
|
|
}
|
|
|
|
static void vbi_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
|
|
{
|
|
struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
|
|
free_buffer(q, buf);
|
|
}
|
|
|
|
struct videobuf_queue_ops em28xx_vbi_qops = {
|
|
.buf_setup = vbi_setup,
|
|
.buf_prepare = vbi_prepare,
|
|
.buf_queue = vbi_queue,
|
|
.buf_release = vbi_release,
|
|
};
|