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(q: 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(q: vb->vb2_queue);
38 unsigned long size;
39
40 size = dev->vbi_width * dev->vbi_height * 2;
41
42 if (vb2_plane_size(vb, plane_no: 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, plane_no: 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(q: 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, plane_no: 0);
63 buf->length = vb2_plane_size(vb, plane_no: 0);
64
65 spin_lock_irqsave(&dev->slock, flags);
66 list_add_tail(new: &buf->list, head: &vbiq->active);
67 spin_unlock_irqrestore(lock: &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

source code of linux/drivers/media/usb/au0828/au0828-vbi.c