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28abf083 DH |
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 <linux/kernel.h> | |
25 | #include <linux/module.h> | |
c59a9bfa | 26 | #include <linux/hardirq.h> |
28abf083 | 27 | #include <linux/init.h> |
28abf083 DH |
28 | |
29 | #include "em28xx.h" | |
30 | ||
31 | static unsigned int vbibufs = 5; | |
cb0409ff DH |
32 | module_param(vbibufs, int, 0644); |
33 | MODULE_PARM_DESC(vbibufs, "number of vbi buffers, range 2-32"); | |
28abf083 DH |
34 | |
35 | static unsigned int vbi_debug; | |
cb0409ff DH |
36 | module_param(vbi_debug, int, 0644); |
37 | MODULE_PARM_DESC(vbi_debug, "enable debug messages [vbi]"); | |
28abf083 | 38 | |
cb0409ff | 39 | #define dprintk(level, fmt, arg...) if (vbi_debug >= level) \ |
28abf083 DH |
40 | printk(KERN_DEBUG "%s: " fmt, dev->core->name , ## arg) |
41 | ||
42 | /* ------------------------------------------------------------------ */ | |
43 | ||
44 | static void | |
45 | free_buffer(struct videobuf_queue *vq, struct em28xx_buffer *buf) | |
46 | { | |
47 | struct em28xx_fh *fh = vq->priv_data; | |
48 | struct em28xx *dev = fh->dev; | |
49 | unsigned long flags = 0; | |
50 | if (in_interrupt()) | |
51 | BUG(); | |
52 | ||
53 | /* We used to wait for the buffer to finish here, but this didn't work | |
54 | because, as we were keeping the state as VIDEOBUF_QUEUED, | |
55 | videobuf_queue_cancel marked it as finished for us. | |
56 | (Also, it could wedge forever if the hardware was misconfigured.) | |
57 | ||
58 | This should be safe; by the time we get here, the buffer isn't | |
59 | queued anymore. If we ever start marking the buffers as | |
60 | VIDEOBUF_ACTIVE, it won't be, though. | |
61 | */ | |
62 | spin_lock_irqsave(&dev->slock, flags); | |
63 | if (dev->isoc_ctl.vbi_buf == buf) | |
64 | dev->isoc_ctl.vbi_buf = NULL; | |
65 | spin_unlock_irqrestore(&dev->slock, flags); | |
66 | ||
67 | videobuf_vmalloc_free(&buf->vb); | |
68 | buf->vb.state = VIDEOBUF_NEEDS_INIT; | |
69 | } | |
70 | ||
71 | static int | |
72 | vbi_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size) | |
73 | { | |
66d9cbad DH |
74 | struct em28xx_fh *fh = q->priv_data; |
75 | struct em28xx *dev = fh->dev; | |
76 | ||
77 | *size = dev->vbi_width * dev->vbi_height * 2; | |
78 | ||
28abf083 DH |
79 | if (0 == *count) |
80 | *count = vbibufs; | |
81 | if (*count < 2) | |
82 | *count = 2; | |
83 | if (*count > 32) | |
84 | *count = 32; | |
85 | return 0; | |
86 | } | |
87 | ||
88 | static int | |
89 | vbi_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb, | |
90 | enum v4l2_field field) | |
91 | { | |
66d9cbad DH |
92 | struct em28xx_fh *fh = q->priv_data; |
93 | struct em28xx *dev = fh->dev; | |
28abf083 DH |
94 | struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb); |
95 | int rc = 0; | |
28abf083 | 96 | |
66d9cbad | 97 | buf->vb.size = dev->vbi_width * dev->vbi_height * 2; |
28abf083 DH |
98 | |
99 | if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size) | |
100 | return -EINVAL; | |
101 | ||
66d9cbad DH |
102 | buf->vb.width = dev->vbi_width; |
103 | buf->vb.height = dev->vbi_height; | |
28abf083 DH |
104 | buf->vb.field = field; |
105 | ||
106 | if (VIDEOBUF_NEEDS_INIT == buf->vb.state) { | |
107 | rc = videobuf_iolock(q, &buf->vb, NULL); | |
108 | if (rc < 0) | |
109 | goto fail; | |
110 | } | |
111 | ||
112 | buf->vb.state = VIDEOBUF_PREPARED; | |
113 | return 0; | |
114 | ||
115 | fail: | |
116 | free_buffer(q, buf); | |
117 | return rc; | |
118 | } | |
119 | ||
120 | static void | |
121 | vbi_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb) | |
122 | { | |
123 | struct em28xx_buffer *buf = container_of(vb, | |
124 | struct em28xx_buffer, | |
125 | vb); | |
126 | struct em28xx_fh *fh = vq->priv_data; | |
127 | struct em28xx *dev = fh->dev; | |
128 | struct em28xx_dmaqueue *vbiq = &dev->vbiq; | |
129 | ||
130 | buf->vb.state = VIDEOBUF_QUEUED; | |
131 | list_add_tail(&buf->vb.queue, &vbiq->active); | |
132 | } | |
133 | ||
134 | static void vbi_release(struct videobuf_queue *q, struct videobuf_buffer *vb) | |
135 | { | |
136 | struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb); | |
137 | free_buffer(q, buf); | |
138 | } | |
139 | ||
140 | struct videobuf_queue_ops em28xx_vbi_qops = { | |
141 | .buf_setup = vbi_setup, | |
142 | .buf_prepare = vbi_prepare, | |
143 | .buf_queue = vbi_queue, | |
144 | .buf_release = vbi_release, | |
145 | }; |