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 #include <media/v4l2-mc.h>
  18
  19 /* ------------------------------------------------------------------ */
  20
  21 static int vbi_queue_setup(struct vb2_queue *vq,
  22                            unsigned int *nbuffers, unsigned int *nplanes,
  23                            unsigned int sizes[], struct device *alloc_devs[])
  24 {
  25         struct au0828_dev *dev = vb2_get_drv_priv(vq);
  26         unsigned long size = dev->vbi_width * dev->vbi_height * 2;
  27
  28         if (*nplanes)
  29                 return sizes[0] < size ? -EINVAL : 0;
  30         *nplanes = 1;
  31         sizes[0] = size;
  32         return 0;
  33 }
  34
  35 static int vbi_buffer_prepare(struct vb2_buffer *vb)
  36 {
  37         struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
  38         unsigned long size;
  39
  40         size = dev->vbi_width * dev->vbi_height * 2;
  41
  42         if (vb2_plane_size(vb, 0) < size) {
  43                 pr_err("%s data will not fit into plane (%lu < %lu)\n",
  44                         __func__, vb2_plane_size(vb, 0), size);
  45                 return -EINVAL;
  46         }
  47         vb2_set_plane_payload(vb, 0, size);
  48
  49         return 0;
  50 }
  51
  52 static void
  53 vbi_buffer_queue(struct vb2_buffer *vb)
  54 {
  55         struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
  56         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
  57         struct au0828_buffer *buf =
  58                         container_of(vbuf, struct au0828_buffer, vb);
  59         struct au0828_dmaqueue *vbiq = &dev->vbiq;
  60         unsigned long flags = 0;
  61
  62         buf->mem = vb2_plane_vaddr(vb, 0);
  63         buf->length = vb2_plane_size(vb, 0);
  64
  65         spin_lock_irqsave(&dev->slock, flags);
  66         list_add_tail(&buf->list, &vbiq->active);
  67         spin_unlock_irqrestore(&dev->slock, flags);
  68 }
  69
  70 const struct vb2_ops au0828_vbi_qops = {
  71         .queue_setup     = vbi_queue_setup,
  72         .buf_prepare     = vbi_buffer_prepare,
  73         .buf_queue       = vbi_buffer_queue,
  74         .prepare_streaming = v4l_vb2q_enable_media_source,
  75         .start_streaming = au0828_start_analog_streaming,
  76         .stop_streaming  = au0828_stop_vbi_streaming,
  77 };