1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3   au0828-vbi.c - VBI driver for au0828
4
5   Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com>
6
7   This work was sponsored by GetWellNetwork Inc.
8
9 */
10
11#include "au0828.h"
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/slab.h>
17#include <media/v4l2-mc.h>
18
19/* ------------------------------------------------------------------ */
20
21static int vbi_queue_setup(struct vb2_queue *vq,
22			   unsigned int *nbuffers, unsigned int *nplanes,
23			   unsigned int sizes[], struct device *alloc_devs[])
24{
25	struct au0828_dev *dev = vb2_get_drv_priv(vq);
26	unsigned long size = dev->vbi_width * dev->vbi_height * 2;
27
28	if (*nplanes)
29		return sizes[0] < size ? -EINVAL : 0;
30	*nplanes = 1;
31	sizes[0] = size;
32	return 0;
33}
34
35static int vbi_buffer_prepare(struct vb2_buffer *vb)
36{
37	struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
38	unsigned long size;
39
40	size = dev->vbi_width * dev->vbi_height * 2;
41
42	if (vb2_plane_size(vb, 0) < size) {
43		pr_err("%s data will not fit into plane (%lu < %lu)\n",
44			__func__, vb2_plane_size(vb, 0), size);
45		return -EINVAL;
46	}
47	vb2_set_plane_payload(vb, 0, size);
48
49	return 0;
50}
51
52static void
53vbi_buffer_queue(struct vb2_buffer *vb)
54{
55	struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
56	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
57	struct au0828_buffer *buf =
58			container_of(vbuf, struct au0828_buffer, vb);
59	struct au0828_dmaqueue *vbiq = &dev->vbiq;
60	unsigned long flags = 0;
61
62	buf->mem = vb2_plane_vaddr(vb, 0);
63	buf->length = vb2_plane_size(vb, 0);
64
65	spin_lock_irqsave(&dev->slock, flags);
66	list_add_tail(&buf->list, &vbiq->active);
67	spin_unlock_irqrestore(&dev->slock, flags);
68}
69
70const struct vb2_ops au0828_vbi_qops = {
71	.queue_setup     = vbi_queue_setup,
72	.buf_prepare     = vbi_buffer_prepare,
73	.buf_queue       = vbi_buffer_queue,
74	.prepare_streaming = v4l_vb2q_enable_media_source,
75	.start_streaming = au0828_start_analog_streaming,
76	.stop_streaming  = au0828_stop_vbi_streaming,
77	.wait_prepare    = vb2_ops_wait_prepare,
78	.wait_finish     = vb2_ops_wait_finish,
79};
80