1 /*
2 au0828-vbi.c - VBI driver for au0828
3
4 Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com>
5
6 This work was sponsored by GetWellNetwork Inc.
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 "au0828.h"
25
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30
31 /* ------------------------------------------------------------------ */
32
vbi_queue_setup(struct vb2_queue * vq,unsigned int * nbuffers,unsigned int * nplanes,unsigned int sizes[],struct device * alloc_devs[])33 static int vbi_queue_setup(struct vb2_queue *vq,
34 unsigned int *nbuffers, unsigned int *nplanes,
35 unsigned int sizes[], struct device *alloc_devs[])
36 {
37 struct au0828_dev *dev = vb2_get_drv_priv(vq);
38 unsigned long size = dev->vbi_width * dev->vbi_height * 2;
39
40 if (*nplanes)
41 return sizes[0] < size ? -EINVAL : 0;
42 *nplanes = 1;
43 sizes[0] = size;
44 return 0;
45 }
46
vbi_buffer_prepare(struct vb2_buffer * vb)47 static int vbi_buffer_prepare(struct vb2_buffer *vb)
48 {
49 struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
50 unsigned long size;
51
52 size = dev->vbi_width * dev->vbi_height * 2;
53
54 if (vb2_plane_size(vb, 0) < size) {
55 pr_err("%s data will not fit into plane (%lu < %lu)\n",
56 __func__, vb2_plane_size(vb, 0), size);
57 return -EINVAL;
58 }
59 vb2_set_plane_payload(vb, 0, size);
60
61 return 0;
62 }
63
64 static void
vbi_buffer_queue(struct vb2_buffer * vb)65 vbi_buffer_queue(struct vb2_buffer *vb)
66 {
67 struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
68 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
69 struct au0828_buffer *buf =
70 container_of(vbuf, struct au0828_buffer, vb);
71 struct au0828_dmaqueue *vbiq = &dev->vbiq;
72 unsigned long flags = 0;
73
74 buf->mem = vb2_plane_vaddr(vb, 0);
75 buf->length = vb2_plane_size(vb, 0);
76
77 spin_lock_irqsave(&dev->slock, flags);
78 list_add_tail(&buf->list, &vbiq->active);
79 spin_unlock_irqrestore(&dev->slock, flags);
80 }
81
82 struct vb2_ops au0828_vbi_qops = {
83 .queue_setup = vbi_queue_setup,
84 .buf_prepare = vbi_buffer_prepare,
85 .buf_queue = vbi_buffer_queue,
86 .start_streaming = au0828_start_analog_streaming,
87 .stop_streaming = au0828_stop_vbi_streaming,
88 .wait_prepare = vb2_ops_wait_prepare,
89 .wait_finish = vb2_ops_wait_finish,
90 };
91