1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/*
tea6415c - i2c-driver for the tea6415c by SGS Thomson
Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
The tea6415c is a bus controlled video-matrix-switch
with 8 inputs and 6 outputs.
It is cascadable, i.e. it can be found at the addresses
0x86 and 0x06 on the i2c-bus.
For detailed informations download the specifications directly
from SGS Thomson at http://www.st.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License vs published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mvss Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/ioctl.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <media/v4l2-device.h>
#include <media/v4l2-chip-ident.h>
#include "tea6415c.h"
MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
MODULE_DESCRIPTION("tea6415c driver");
MODULE_LICENSE("GPL");
static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Debug level (0-1)");
/* makes a connection between the input-pin 'i' and the output-pin 'o' */
static int tea6415c_s_routing(struct v4l2_subdev *sd,
u32 i, u32 o, u32 config)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
u8 byte = 0;
int ret;
v4l2_dbg(1, debug, sd, "i=%d, o=%d\n", i, o);
/* check if the pins are valid */
if (0 == ((1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i)
&& (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o)))
return -EINVAL;
/* to understand this, have a look at the tea6415c-specs (p.5) */
switch (o) {
case 18:
byte = 0x00;
break;
case 14:
byte = 0x20;
break;
case 16:
byte = 0x10;
break;
case 17:
byte = 0x08;
break;
case 15:
byte = 0x18;
break;
case 13:
byte = 0x28;
break;
};
switch (i) {
case 5:
byte |= 0x00;
break;
case 8:
byte |= 0x04;
break;
case 3:
byte |= 0x02;
break;
case 20:
byte |= 0x06;
break;
case 6:
byte |= 0x01;
break;
case 10:
byte |= 0x05;
break;
case 1:
byte |= 0x03;
break;
case 11:
byte |= 0x07;
break;
};
ret = i2c_smbus_write_byte(client, byte);
if (ret) {
v4l2_dbg(1, debug, sd,
"i2c_smbus_write_byte() failed, ret:%d\n", ret);
return -EIO;
}
return ret;
}
static int tea6415c_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEA6415C, 0);
}
/* ----------------------------------------------------------------------- */
static const struct v4l2_subdev_core_ops tea6415c_core_ops = {
.g_chip_ident = tea6415c_g_chip_ident,
};
static const struct v4l2_subdev_video_ops tea6415c_video_ops = {
.s_routing = tea6415c_s_routing,
};
static const struct v4l2_subdev_ops tea6415c_ops = {
.core = &tea6415c_core_ops,
.video = &tea6415c_video_ops,
};
static int tea6415c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct v4l2_subdev *sd;
/* let's see whether this adapter can support what we need */
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
return 0;
v4l_info(client, "chip found @ 0x%x (%s)\n",
client->addr << 1, client->adapter->name);
sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
if (sd == NULL)
return -ENOMEM;
v4l2_i2c_subdev_init(sd, client, &tea6415c_ops);
return 0;
}
static int tea6415c_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
v4l2_device_unregister_subdev(sd);
kfree(sd);
return 0;
}
static const struct i2c_device_id tea6415c_id[] = {
{ "tea6415c", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tea6415c_id);
static struct i2c_driver tea6415c_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "tea6415c",
},
.probe = tea6415c_probe,
.remove = tea6415c_remove,
.id_table = tea6415c_id,
};
static __init int init_tea6415c(void)
{
return i2c_add_driver(&tea6415c_driver);
}
static __exit void exit_tea6415c(void)
{
i2c_del_driver(&tea6415c_driver);
}
module_init(init_tea6415c);
module_exit(exit_tea6415c);
|
