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
18 /* ------------------------------------------------------------------ */
19
vbi_queue_setup(struct vb2_queue * vq,unsigned int * nbuffers,unsigned int * nplanes,unsigned int sizes[],struct device * alloc_devs[])20 static int vbi_queue_setup(struct vb2_queue *vq,
21 unsigned int *nbuffers, unsigned int *nplanes,
22 unsigned int sizes[], struct device *alloc_devs[])
23 {
24 struct au0828_dev *dev = vb2_get_drv_priv(vq);
25 unsigned long size = dev->vbi_width * dev->vbi_height * 2;
26
27 if (*nplanes)
28 return sizes[0] < size ? -EINVAL : 0;
29 *nplanes = 1;
30 sizes[0] = size;
31 return 0;
32 }
33
vbi_buffer_prepare(struct vb2_buffer * vb)34 static int vbi_buffer_prepare(struct vb2_buffer *vb)
35 {
36 struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
37 unsigned long size;
38
39 size = dev->vbi_width * dev->vbi_height * 2;
40
41 if (vb2_plane_size(vb, 0) < size) {
42 pr_err("%s data will not fit into plane (%lu < %lu)\n",
43 __func__, vb2_plane_size(vb, 0), size);
44 return -EINVAL;
45 }
46 vb2_set_plane_payload(vb, 0, size);
47
48 return 0;
49 }
50
51 static void
vbi_buffer_queue(struct vb2_buffer * vb)52 vbi_buffer_queue(struct vb2_buffer *vb)
53 {
54 struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
55 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
56 struct au0828_buffer *buf =
57 container_of(vbuf, struct au0828_buffer, vb);
58 struct au0828_dmaqueue *vbiq = &dev->vbiq;
59 unsigned long flags = 0;
60
61 buf->mem = vb2_plane_vaddr(vb, 0);
62 buf->length = vb2_plane_size(vb, 0);
63
64 spin_lock_irqsave(&dev->slock, flags);
65 list_add_tail(&buf->list, &vbiq->active);
66 spin_unlock_irqrestore(&dev->slock, flags);
67 }
68
69 const struct vb2_ops au0828_vbi_qops = {
70 .queue_setup = vbi_queue_setup,
71 .buf_prepare = vbi_buffer_prepare,
72 .buf_queue = vbi_buffer_queue,
73 .start_streaming = au0828_start_analog_streaming,
74 .stop_streaming = au0828_stop_vbi_streaming,
75 .wait_prepare = vb2_ops_wait_prepare,
76 .wait_finish = vb2_ops_wait_finish,
77 };
78