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

   1 /*
   2    au0828-vbi.c - VBI driver for au0828
   3
   4    Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com>
   5
   6    This work was sponsored by GetWellNetwork Inc.
   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 "au0828.h"
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/slab.h>
  30
  31 /* ------------------------------------------------------------------ */
  32
  33 static int vbi_queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
  34                            unsigned int *nbuffers, unsigned int *nplanes,
  35                            unsigned int sizes[], void *alloc_ctxs[])
  36 {
  37         struct au0828_dev *dev = vb2_get_drv_priv(vq);
  38         unsigned long img_size = dev->vbi_width * dev->vbi_height * 2;
  39         unsigned long size;
  40
  41         size = fmt ? (fmt->fmt.vbi.samples_per_line *
  42                 (fmt->fmt.vbi.count[0] + fmt->fmt.vbi.count[1])) : img_size;
  43         if (size < img_size)
  44                 return -EINVAL;
  45
  46         *nplanes = 1;
  47         sizes[0] = size;
  48
  49         return 0;
  50 }
  51
  52 static int vbi_buffer_prepare(struct vb2_buffer *vb)
  53 {
  54         struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
  55         unsigned long size;
  56
  57         size = dev->vbi_width * dev->vbi_height * 2;
  58
  59         if (vb2_plane_size(vb, 0) < size) {
  60                 pr_err("%s data will not fit into plane (%lu < %lu)\n",
  61                         __func__, vb2_plane_size(vb, 0), size);
  62                 return -EINVAL;
  63         }
  64         vb2_set_plane_payload(vb, 0, size);
  65
  66         return 0;
  67 }
  68
  69 static void
  70 vbi_buffer_queue(struct vb2_buffer *vb)
  71 {
  72         struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
  73         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
  74         struct au0828_buffer *buf =
  75                         container_of(vbuf, struct au0828_buffer, vb);
  76         struct au0828_dmaqueue *vbiq = &dev->vbiq;
  77         unsigned long flags = 0;
  78
  79         buf->mem = vb2_plane_vaddr(vb, 0);
  80         buf->length = vb2_plane_size(vb, 0);
  81
  82         spin_lock_irqsave(&dev->slock, flags);
  83         list_add_tail(&buf->list, &vbiq->active);
  84         spin_unlock_irqrestore(&dev->slock, flags);
  85 }
  86
  87 struct vb2_ops au0828_vbi_qops = {
  88         .queue_setup     = vbi_queue_setup,
  89         .buf_prepare     = vbi_buffer_prepare,
  90         .buf_queue       = vbi_buffer_queue,
  91         .start_streaming = au0828_start_analog_streaming,
  92         .stop_streaming  = au0828_stop_vbi_streaming,
  93         .wait_prepare    = vb2_ops_wait_prepare,
  94         .wait_finish     = vb2_ops_wait_finish,
  95 };