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,
  34                            unsigned int *nbuffers, unsigned int *nplanes,
  35                            unsigned int sizes[], struct device *alloc_devs[])
  36 {
  37         struct au0828_dev *dev = vb2_get_drv_priv(vq);
  38         unsigned long size = dev->vbi_width * dev->vbi_height * 2;
  39
  40         if (*nplanes)
  41                 return sizes[0] < size ? -EINVAL : 0;
  42         *nplanes = 1;
  43         sizes[0] = size;
  44         return 0;
  45 }
  46
  47 static int vbi_buffer_prepare(struct vb2_buffer *vb)
  48 {
  49         struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
  50         unsigned long size;
  51
  52         size = dev->vbi_width * dev->vbi_height * 2;
  53
  54         if (vb2_plane_size(vb, 0) < size) {
  55                 pr_err("%s data will not fit into plane (%lu < %lu)\n",
  56                         __func__, vb2_plane_size(vb, 0), size);
  57                 return -EINVAL;
  58         }
  59         vb2_set_plane_payload(vb, 0, size);
  60
  61         return 0;
  62 }
  63
  64 static void
  65 vbi_buffer_queue(struct vb2_buffer *vb)
  66 {
  67         struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
  68         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
  69         struct au0828_buffer *buf =
  70                         container_of(vbuf, struct au0828_buffer, vb);
  71         struct au0828_dmaqueue *vbiq = &dev->vbiq;
  72         unsigned long flags = 0;
  73
  74         buf->mem = vb2_plane_vaddr(vb, 0);
  75         buf->length = vb2_plane_size(vb, 0);
  76
  77         spin_lock_irqsave(&dev->slock, flags);
  78         list_add_tail(&buf->list, &vbiq->active);
  79         spin_unlock_irqrestore(&dev->slock, flags);
  80 }
  81
  82 const struct vb2_ops au0828_vbi_qops = {
  83         .queue_setup     = vbi_queue_setup,
  84         .buf_prepare     = vbi_buffer_prepare,
  85         .buf_queue       = vbi_buffer_queue,
  86         .start_streaming = au0828_start_analog_streaming,
  87         .stop_streaming  = au0828_stop_vbi_streaming,
  88         .wait_prepare    = vb2_ops_wait_prepare,
  89         .wait_finish     = vb2_ops_wait_finish,
  90 };