LXR linux/drivers/media/usb/au0828/au0828-vbi.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3   au0828-vbi.c - VBI driver for au0828
   4
   5   Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com>
   6
   7   This work was sponsored by GetWellNetwork Inc.
   8
   9 */
  10
  11#include "au0828.h"
  12
  13#include <linux/kernel.h>
  14#include <linux/module.h>
  15#include <linux/init.h>
  16#include <linux/slab.h>
  17
  18/* ------------------------------------------------------------------ */
  19
  20static int vbi_queue_setup(struct vb2_queue *vq,
  21                           unsigned int *nbuffers, unsigned int *nplanes,
  22                           unsigned int sizes[], struct device *alloc_devs[])
  23{
  24        struct au0828_dev *dev = vb2_get_drv_priv(vq);
  25        unsigned long size = dev->vbi_width * dev->vbi_height * 2;
  26
  27        if (*nplanes)
  28                return sizes[0] < size ? -EINVAL : 0;
  29        *nplanes = 1;
  30        sizes[0] = size;
  31        return 0;
  32}
  33
  34static int vbi_buffer_prepare(struct vb2_buffer *vb)
  35{
  36        struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
  37        unsigned long size;
  38
  39        size = dev->vbi_width * dev->vbi_height * 2;
  40
  41        if (vb2_plane_size(vb, 0) < size) {
  42                pr_err("%s data will not fit into plane (%lu < %lu)\n",
  43                        __func__, vb2_plane_size(vb, 0), size);
  44                return -EINVAL;
  45        }
  46        vb2_set_plane_payload(vb, 0, size);
  47
  48        return 0;
  49}
  50
  51static void
  52vbi_buffer_queue(struct vb2_buffer *vb)
  53{
  54        struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
  55        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
  56        struct au0828_buffer *buf =
  57                        container_of(vbuf, struct au0828_buffer, vb);
  58        struct au0828_dmaqueue *vbiq = &dev->vbiq;
  59        unsigned long flags = 0;
  60
  61        buf->mem = vb2_plane_vaddr(vb, 0);
  62        buf->length = vb2_plane_size(vb, 0);
  63
  64        spin_lock_irqsave(&dev->slock, flags);
  65        list_add_tail(&buf->list, &vbiq->active);
  66        spin_unlock_irqrestore(&dev->slock, flags);
  67}
  68
  69const struct vb2_ops au0828_vbi_qops = {
  70        .queue_setup     = vbi_queue_setup,
  71        .buf_prepare     = vbi_buffer_prepare,
  72        .buf_queue       = vbi_buffer_queue,
  73        .start_streaming = au0828_start_analog_streaming,
  74        .stop_streaming  = au0828_stop_vbi_streaming,
  75        .wait_prepare    = vb2_ops_wait_prepare,
  76        .wait_finish     = vb2_ops_wait_finish,
  77};
  78