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 struct v4l2_format *fmt,
35			   unsigned int *nbuffers, unsigned int *nplanes,
36			   unsigned int sizes[], void *alloc_ctxs[])
37{
38	struct em28xx *dev = vb2_get_drv_priv(vq);
39	struct em28xx_v4l2 *v4l2 = dev->v4l2;
40	unsigned long size;
41
42	if (fmt)
43		size = fmt->fmt.pix.sizeimage;
44	else
45		size = v4l2->vbi_width * v4l2->vbi_height * 2;
46
47	if (0 == *nbuffers)
48		*nbuffers = 32;
49	if (*nbuffers < 2)
50		*nbuffers = 2;
51	if (*nbuffers > 32)
52		*nbuffers = 32;
53
54	*nplanes = 1;
55	sizes[0] = size;
56
57	return 0;
58}
59
60static int vbi_buffer_prepare(struct vb2_buffer *vb)
61{
62	struct em28xx        *dev  = vb2_get_drv_priv(vb->vb2_queue);
63	struct em28xx_v4l2   *v4l2 = dev->v4l2;
64	struct em28xx_buffer *buf  = container_of(vb, struct em28xx_buffer, vb);
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(&buf->vb, 0, size);
75
76	return 0;
77}
78
79static void
80vbi_buffer_queue(struct vb2_buffer *vb)
81{
82	struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
83	struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
84	struct em28xx_dmaqueue *vbiq = &dev->vbiq;
85	unsigned long flags = 0;
86
87	buf->mem = vb2_plane_vaddr(vb, 0);
88	buf->length = vb2_plane_size(vb, 0);
89
90	spin_lock_irqsave(&dev->slock, flags);
91	list_add_tail(&buf->list, &vbiq->active);
92	spin_unlock_irqrestore(&dev->slock, flags);
93}
94
95struct vb2_ops em28xx_vbi_qops = {
96	.queue_setup    = vbi_queue_setup,
97	.buf_prepare    = vbi_buffer_prepare,
98	.buf_queue      = vbi_buffer_queue,
99	.start_streaming = em28xx_start_analog_streaming,
100	.stop_streaming = em28xx_stop_vbi_streaming,
101	.wait_prepare   = vb2_ops_wait_prepare,
102	.wait_finish    = vb2_ops_wait_finish,
103};
104