mirror of https://gitee.com/openkylin/linux.git
145 lines
4.0 KiB
C
145 lines
4.0 KiB
C
/*
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em28xx-vbi.c - VBI driver for em28xx
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Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
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This work was sponsored by EyeMagnet Limited.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include "em28xx.h"
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static unsigned int vbibufs = 5;
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module_param(vbibufs, int, 0644);
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MODULE_PARM_DESC(vbibufs, "number of vbi buffers, range 2-32");
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static unsigned int vbi_debug;
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module_param(vbi_debug, int, 0644);
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MODULE_PARM_DESC(vbi_debug, "enable debug messages [vbi]");
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#define dprintk(level, fmt, arg...) if (vbi_debug >= level) \
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printk(KERN_DEBUG "%s: " fmt, dev->core->name , ## arg)
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/* ------------------------------------------------------------------ */
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static void
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free_buffer(struct videobuf_queue *vq, struct em28xx_buffer *buf)
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{
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struct em28xx_fh *fh = vq->priv_data;
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struct em28xx *dev = fh->dev;
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unsigned long flags = 0;
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if (in_interrupt())
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BUG();
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/* We used to wait for the buffer to finish here, but this didn't work
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because, as we were keeping the state as VIDEOBUF_QUEUED,
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videobuf_queue_cancel marked it as finished for us.
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(Also, it could wedge forever if the hardware was misconfigured.)
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This should be safe; by the time we get here, the buffer isn't
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queued anymore. If we ever start marking the buffers as
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VIDEOBUF_ACTIVE, it won't be, though.
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*/
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spin_lock_irqsave(&dev->slock, flags);
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if (dev->isoc_ctl.vbi_buf == buf)
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dev->isoc_ctl.vbi_buf = NULL;
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spin_unlock_irqrestore(&dev->slock, flags);
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videobuf_vmalloc_free(&buf->vb);
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buf->vb.state = VIDEOBUF_NEEDS_INIT;
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}
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static int
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vbi_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
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{
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struct em28xx_fh *fh = q->priv_data;
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struct em28xx *dev = fh->dev;
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*size = dev->vbi_width * dev->vbi_height * 2;
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if (0 == *count)
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*count = vbibufs;
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if (*count < 2)
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*count = 2;
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if (*count > 32)
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*count = 32;
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return 0;
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}
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static int
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vbi_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
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enum v4l2_field field)
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{
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struct em28xx_fh *fh = q->priv_data;
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struct em28xx *dev = fh->dev;
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struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
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int rc = 0;
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buf->vb.size = dev->vbi_width * dev->vbi_height * 2;
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if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
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return -EINVAL;
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buf->vb.width = dev->vbi_width;
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buf->vb.height = dev->vbi_height;
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buf->vb.field = field;
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if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
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rc = videobuf_iolock(q, &buf->vb, NULL);
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if (rc < 0)
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goto fail;
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}
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buf->vb.state = VIDEOBUF_PREPARED;
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return 0;
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fail:
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free_buffer(q, buf);
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return rc;
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}
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static void
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vbi_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
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{
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struct em28xx_buffer *buf = container_of(vb,
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struct em28xx_buffer,
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vb);
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struct em28xx_fh *fh = vq->priv_data;
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struct em28xx *dev = fh->dev;
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struct em28xx_dmaqueue *vbiq = &dev->vbiq;
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buf->vb.state = VIDEOBUF_QUEUED;
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list_add_tail(&buf->vb.queue, &vbiq->active);
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}
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static void vbi_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
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{
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struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
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free_buffer(q, buf);
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}
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struct videobuf_queue_ops em28xx_vbi_qops = {
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.buf_setup = vbi_setup,
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.buf_prepare = vbi_prepare,
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.buf_queue = vbi_queue,
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.buf_release = vbi_release,
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};
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