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 
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 
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
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 const 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