1 /*
2    em28xx-vbi.c - VBI driver for em28xx
3 
4    Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
5 
6    This work was sponsored by EyeMagnet Limited.
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 "em28xx.h"
25 
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/hardirq.h>
29 #include <linux/init.h>
30 #include <linux/usb.h>
31 
32 #include "em28xx-v4l.h"
33 
34 /* ------------------------------------------------------------------ */
35 
36 static int vbi_queue_setup(struct vb2_queue *vq,
37 			   unsigned int *nbuffers, unsigned int *nplanes,
38 			   unsigned int sizes[], struct device *alloc_devs[])
39 {
40 	struct em28xx *dev = vb2_get_drv_priv(vq);
41 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
42 	unsigned long size = v4l2->vbi_width * v4l2->vbi_height * 2;
43 
44 	if (*nbuffers < 2)
45 		*nbuffers = 2;
46 
47 	if (*nplanes) {
48 		if (sizes[0] < size)
49 			return -EINVAL;
50 		size = sizes[0];
51 	}
52 
53 	*nplanes = 1;
54 	sizes[0] = size;
55 
56 	return 0;
57 }
58 
59 static int vbi_buffer_prepare(struct vb2_buffer *vb)
60 {
61 	struct em28xx        *dev  = vb2_get_drv_priv(vb->vb2_queue);
62 	struct em28xx_v4l2   *v4l2 = dev->v4l2;
63 	unsigned long        size;
64 
65 	size = v4l2->vbi_width * v4l2->vbi_height * 2;
66 
67 	if (vb2_plane_size(vb, 0) < size) {
68 		dev_info(&dev->intf->dev,
69 			 "%s data will not fit into plane (%lu < %lu)\n",
70 			 __func__, vb2_plane_size(vb, 0), size);
71 		return -EINVAL;
72 	}
73 	vb2_set_plane_payload(vb, 0, size);
74 
75 	return 0;
76 }
77 
78 static void
79 vbi_buffer_queue(struct vb2_buffer *vb)
80 {
81 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
82 	struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
83 	struct em28xx_buffer *buf =
84 		container_of(vbuf, struct em28xx_buffer, vb);
85 	struct em28xx_dmaqueue *vbiq = &dev->vbiq;
86 	unsigned long flags = 0;
87 
88 	buf->mem = vb2_plane_vaddr(vb, 0);
89 	buf->length = vb2_plane_size(vb, 0);
90 
91 	spin_lock_irqsave(&dev->slock, flags);
92 	list_add_tail(&buf->list, &vbiq->active);
93 	spin_unlock_irqrestore(&dev->slock, flags);
94 }
95 
96 const struct vb2_ops em28xx_vbi_qops = {
97 	.queue_setup    = vbi_queue_setup,
98 	.buf_prepare    = vbi_buffer_prepare,
99 	.buf_queue      = vbi_buffer_queue,
100 	.start_streaming = em28xx_start_analog_streaming,
101 	.stop_streaming = em28xx_stop_vbi_streaming,
102 	.wait_prepare   = vb2_ops_wait_prepare,
103 	.wait_finish    = vb2_ops_wait_finish,
104 };
105