1// SPDX-License-Identifier: GPL-2.0+
2//
3// em28xx-vbi.c - VBI driver for em28xx
4//
5// Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
6//
7// This work was sponsored by EyeMagnet Limited.
8//
9// This program is free software; you can redistribute it and/or modify
10// it under the terms of the GNU General Public License as published by
11// the Free Software Foundation; either version 2 of the License, or
12// (at your option) any later version.
13//
14// This program is distributed in the hope that it will be useful,
15// but WITHOUT ANY WARRANTY; without even the implied warranty of
16// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17// GNU General Public License for more details.
18
19#include "em28xx.h"
20
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/hardirq.h>
24#include <linux/init.h>
25#include <linux/usb.h>
26
27#include "em28xx-v4l.h"
28
29/* ------------------------------------------------------------------ */
30
31static int vbi_queue_setup(struct vb2_queue *vq,
32			   unsigned int *nbuffers, unsigned int *nplanes,
33			   unsigned int sizes[], struct device *alloc_devs[])
34{
35	struct em28xx *dev = vb2_get_drv_priv(vq);
36	struct em28xx_v4l2 *v4l2 = dev->v4l2;
37	unsigned long size = v4l2->vbi_width * v4l2->vbi_height * 2;
38
39	if (*nbuffers < 2)
40		*nbuffers = 2;
41
42	if (*nplanes) {
43		if (sizes[0] < size)
44			return -EINVAL;
45		size = sizes[0];
46	}
47
48	*nplanes = 1;
49	sizes[0] = size;
50
51	return 0;
52}
53
54static int vbi_buffer_prepare(struct vb2_buffer *vb)
55{
56	struct em28xx        *dev  = vb2_get_drv_priv(vb->vb2_queue);
57	struct em28xx_v4l2   *v4l2 = dev->v4l2;
58	unsigned long        size;
59
60	size = v4l2->vbi_width * v4l2->vbi_height * 2;
61
62	if (vb2_plane_size(vb, 0) < size) {
63		dev_info(&dev->intf->dev,
64			 "%s data will not fit into plane (%lu < %lu)\n",
65			 __func__, vb2_plane_size(vb, 0), size);
66		return -EINVAL;
67	}
68	vb2_set_plane_payload(vb, 0, size);
69
70	return 0;
71}
72
73static void
74vbi_buffer_queue(struct vb2_buffer *vb)
75{
76	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
77	struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
78	struct em28xx_buffer *buf =
79		container_of(vbuf, struct em28xx_buffer, vb);
80	struct em28xx_dmaqueue *vbiq = &dev->vbiq;
81	unsigned long flags = 0;
82
83	buf->mem = vb2_plane_vaddr(vb, 0);
84	buf->length = vb2_plane_size(vb, 0);
85
86	spin_lock_irqsave(&dev->slock, flags);
87	list_add_tail(&buf->list, &vbiq->active);
88	spin_unlock_irqrestore(&dev->slock, flags);
89}
90
91const struct vb2_ops em28xx_vbi_qops = {
92	.queue_setup    = vbi_queue_setup,
93	.buf_prepare    = vbi_buffer_prepare,
94	.buf_queue      = vbi_buffer_queue,
95	.start_streaming = em28xx_start_analog_streaming,
96	.stop_streaming = em28xx_stop_vbi_streaming,
97	.wait_prepare   = vb2_ops_wait_prepare,
98	.wait_finish    = vb2_ops_wait_finish,
99};
100