1/*
2   em28xx-vbi.c - VBI driver for em28xx
3
4   Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
5
6   This work was sponsored by EyeMagnet Limited.
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 <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/hardirq.h>
27#include <linux/init.h>
28
29#include "em28xx.h"
30#include "em28xx-v4l.h"
31
32/* ------------------------------------------------------------------ */
33
34static int vbi_queue_setup(struct vb2_queue *vq, const void *parg,
35			   unsigned int *nbuffers, unsigned int *nplanes,
36			   unsigned int sizes[], void *alloc_ctxs[])
37{
38	const struct v4l2_format *fmt = parg;
39	struct em28xx *dev = vb2_get_drv_priv(vq);
40	struct em28xx_v4l2 *v4l2 = dev->v4l2;
41	unsigned long size;
42
43	if (fmt)
44		size = fmt->fmt.pix.sizeimage;
45	else
46		size = v4l2->vbi_width * v4l2->vbi_height * 2;
47
48	if (0 == *nbuffers)
49		*nbuffers = 32;
50	if (*nbuffers < 2)
51		*nbuffers = 2;
52	if (*nbuffers > 32)
53		*nbuffers = 32;
54
55	*nplanes = 1;
56	sizes[0] = size;
57
58	return 0;
59}
60
61static int vbi_buffer_prepare(struct vb2_buffer *vb)
62{
63	struct em28xx        *dev  = vb2_get_drv_priv(vb->vb2_queue);
64	struct em28xx_v4l2   *v4l2 = dev->v4l2;
65	unsigned long        size;
66
67	size = v4l2->vbi_width * v4l2->vbi_height * 2;
68
69	if (vb2_plane_size(vb, 0) < size) {
70		printk(KERN_INFO "%s data will not fit into plane (%lu < %lu)\n",
71		       __func__, vb2_plane_size(vb, 0), size);
72		return -EINVAL;
73	}
74	vb2_set_plane_payload(vb, 0, size);
75
76	return 0;
77}
78
79static void
80vbi_buffer_queue(struct vb2_buffer *vb)
81{
82	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
83	struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
84	struct em28xx_buffer *buf =
85		container_of(vbuf, struct em28xx_buffer, vb);
86	struct em28xx_dmaqueue *vbiq = &dev->vbiq;
87	unsigned long flags = 0;
88
89	buf->mem = vb2_plane_vaddr(vb, 0);
90	buf->length = vb2_plane_size(vb, 0);
91
92	spin_lock_irqsave(&dev->slock, flags);
93	list_add_tail(&buf->list, &vbiq->active);
94	spin_unlock_irqrestore(&dev->slock, flags);
95}
96
97struct vb2_ops em28xx_vbi_qops = {
98	.queue_setup    = vbi_queue_setup,
99	.buf_prepare    = vbi_buffer_prepare,
100	.buf_queue      = vbi_buffer_queue,
101	.start_streaming = em28xx_start_analog_streaming,
102	.stop_streaming = em28xx_stop_vbi_streaming,
103	.wait_prepare   = vb2_ops_wait_prepare,
104	.wait_finish    = vb2_ops_wait_finish,
105};
106