LXR linux/drivers/media/usb/em28xx/em28xx-vbi.c

   1/*
   2   em28xx-vbi.c - VBI driver for em28xx
   3
   4   Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
   5
   6   This work was sponsored by EyeMagnet Limited.
   7
   8   This program is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with this program; if not, write to the Free Software
  20   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21   02110-1301, USA.
  22 */
  23
  24#include "em28xx.h"
  25
  26#include <linux/kernel.h>
  27#include <linux/module.h>
  28#include <linux/hardirq.h>
  29#include <linux/init.h>
  30#include <linux/usb.h>
  31
  32#include "em28xx-v4l.h"
  33
  34/* ------------------------------------------------------------------ */
  35
  36static int vbi_queue_setup(struct vb2_queue *vq,
  37                           unsigned int *nbuffers, unsigned int *nplanes,
  38                           unsigned int sizes[], struct device *alloc_devs[])
  39{
  40        struct em28xx *dev = vb2_get_drv_priv(vq);
  41        struct em28xx_v4l2 *v4l2 = dev->v4l2;
  42        unsigned long size = v4l2->vbi_width * v4l2->vbi_height * 2;
  43
  44        if (*nbuffers < 2)
  45                *nbuffers = 2;
  46
  47        if (*nplanes) {
  48                if (sizes[0] < size)
  49                        return -EINVAL;
  50                size = sizes[0];
  51        }
  52
  53        *nplanes = 1;
  54        sizes[0] = size;
  55
  56        return 0;
  57}
  58
  59static int vbi_buffer_prepare(struct vb2_buffer *vb)
  60{
  61        struct em28xx        *dev  = vb2_get_drv_priv(vb->vb2_queue);
  62        struct em28xx_v4l2   *v4l2 = dev->v4l2;
  63        unsigned long        size;
  64
  65        size = v4l2->vbi_width * v4l2->vbi_height * 2;
  66
  67        if (vb2_plane_size(vb, 0) < size) {
  68                dev_info(&dev->intf->dev,
  69                         "%s data will not fit into plane (%lu < %lu)\n",
  70                         __func__, vb2_plane_size(vb, 0), size);
  71                return -EINVAL;
  72        }
  73        vb2_set_plane_payload(vb, 0, size);
  74
  75        return 0;
  76}
  77
  78static void
  79vbi_buffer_queue(struct vb2_buffer *vb)
  80{
  81        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
  82        struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
  83        struct em28xx_buffer *buf =
  84                container_of(vbuf, struct em28xx_buffer, vb);
  85        struct em28xx_dmaqueue *vbiq = &dev->vbiq;
  86        unsigned long flags = 0;
  87
  88        buf->mem = vb2_plane_vaddr(vb, 0);
  89        buf->length = vb2_plane_size(vb, 0);
  90
  91        spin_lock_irqsave(&dev->slock, flags);
  92        list_add_tail(&buf->list, &vbiq->active);
  93        spin_unlock_irqrestore(&dev->slock, flags);
  94}
  95
  96struct vb2_ops em28xx_vbi_qops = {
  97        .queue_setup    = vbi_queue_setup,
  98        .buf_prepare    = vbi_buffer_prepare,
  99        .buf_queue      = vbi_buffer_queue,
 100        .start_streaming = em28xx_start_analog_streaming,
 101        .stop_streaming = em28xx_stop_vbi_streaming,
 102        .wait_prepare   = vb2_ops_wait_prepare,
 103        .wait_finish    = vb2_ops_wait_finish,
 104};
 105