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
33static 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
52static int vbi_buffer_prepare(struct vb2_buffer *vb)
53{
54	struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
55	struct au0828_buffer *buf = container_of(vb, struct au0828_buffer, vb);
56	unsigned long size;
57
58	size = dev->vbi_width * dev->vbi_height * 2;
59
60	if (vb2_plane_size(vb, 0) < size) {
61		pr_err("%s data will not fit into plane (%lu < %lu)\n",
62			__func__, vb2_plane_size(vb, 0), size);
63		return -EINVAL;
64	}
65	vb2_set_plane_payload(&buf->vb, 0, size);
66
67	return 0;
68}
69
70static void
71vbi_buffer_queue(struct vb2_buffer *vb)
72{
73	struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
74	struct au0828_buffer *buf = container_of(vb, struct au0828_buffer, vb);
75	struct au0828_dmaqueue *vbiq = &dev->vbiq;
76	unsigned long flags = 0;
77
78	buf->mem = vb2_plane_vaddr(vb, 0);
79	buf->length = vb2_plane_size(vb, 0);
80
81	spin_lock_irqsave(&dev->slock, flags);
82	list_add_tail(&buf->list, &vbiq->active);
83	spin_unlock_irqrestore(&dev->slock, flags);
84}
85
86struct vb2_ops au0828_vbi_qops = {
87	.queue_setup     = vbi_queue_setup,
88	.buf_prepare     = vbi_buffer_prepare,
89	.buf_queue       = vbi_buffer_queue,
90	.start_streaming = au0828_start_analog_streaming,
91	.stop_streaming  = au0828_stop_vbi_streaming,
92	.wait_prepare    = vb2_ops_wait_prepare,
93	.wait_finish     = vb2_ops_wait_finish,
94};
95