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

   1// SPDX-License-Identifier: GPL-2.0+
   2//
   3// em28xx-vbi.c - VBI driver for em28xx
   4//
   5// Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
   6//
   7// This work was sponsored by EyeMagnet Limited.
   8//
   9// This program is free software; you can redistribute it and/or modify
  10// it under the terms of the GNU General Public License as published by
  11// the Free Software Foundation; either version 2 of the License, or
  12// (at your option) any later version.
  13//
  14// This program is distributed in the hope that it will be useful,
  15// but WITHOUT ANY WARRANTY; without even the implied warranty of
  16// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17// GNU General Public License for more details.
  18
  19#include "em28xx.h"
  20
  21#include <linux/kernel.h>
  22#include <linux/module.h>
  23#include <linux/hardirq.h>
  24#include <linux/init.h>
  25#include <linux/usb.h>
  26
  27#include "em28xx-v4l.h"
  28
  29/* ------------------------------------------------------------------ */
  30
  31static int vbi_queue_setup(struct vb2_queue *vq,
  32                           unsigned int *nbuffers, unsigned int *nplanes,
  33                           unsigned int sizes[], struct device *alloc_devs[])
  34{
  35        struct em28xx *dev = vb2_get_drv_priv(vq);
  36        struct em28xx_v4l2 *v4l2 = dev->v4l2;
  37        unsigned long size = v4l2->vbi_width * v4l2->vbi_height * 2;
  38
  39        if (*nbuffers < 2)
  40                *nbuffers = 2;
  41
  42        if (*nplanes) {
  43                if (sizes[0] < size)
  44                        return -EINVAL;
  45                size = sizes[0];
  46        }
  47
  48        *nplanes = 1;
  49        sizes[0] = size;
  50
  51        return 0;
  52}
  53
  54static int vbi_buffer_prepare(struct vb2_buffer *vb)
  55{
  56        struct em28xx        *dev  = vb2_get_drv_priv(vb->vb2_queue);
  57        struct em28xx_v4l2   *v4l2 = dev->v4l2;
  58        unsigned long        size;
  59
  60        size = v4l2->vbi_width * v4l2->vbi_height * 2;
  61
  62        if (vb2_plane_size(vb, 0) < size) {
  63                dev_info(&dev->intf->dev,
  64                         "%s data will not fit into plane (%lu < %lu)\n",
  65                         __func__, vb2_plane_size(vb, 0), size);
  66                return -EINVAL;
  67        }
  68        vb2_set_plane_payload(vb, 0, size);
  69
  70        return 0;
  71}
  72
  73static void
  74vbi_buffer_queue(struct vb2_buffer *vb)
  75{
  76        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
  77        struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
  78        struct em28xx_buffer *buf =
  79                container_of(vbuf, struct em28xx_buffer, vb);
  80        struct em28xx_dmaqueue *vbiq = &dev->vbiq;
  81        unsigned long flags = 0;
  82
  83        buf->mem = vb2_plane_vaddr(vb, 0);
  84        buf->length = vb2_plane_size(vb, 0);
  85
  86        spin_lock_irqsave(&dev->slock, flags);
  87        list_add_tail(&buf->list, &vbiq->active);
  88        spin_unlock_irqrestore(&dev->slock, flags);
  89}
  90
  91const struct vb2_ops em28xx_vbi_qops = {
  92        .queue_setup    = vbi_queue_setup,
  93        .buf_prepare    = vbi_buffer_prepare,
  94        .buf_queue      = vbi_buffer_queue,
  95        .start_streaming = em28xx_start_analog_streaming,
  96        .stop_streaming = em28xx_stop_vbi_streaming,
  97        .wait_prepare   = vb2_ops_wait_prepare,
  98        .wait_finish    = vb2_ops_wait_finish,
  99};
 100