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
|
/*
tea6420 - i2c-driver for the tea6420 by SGS Thomson
Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
The tea6420 is a bus controlled audio-matrix with 5 stereo inputs,
4 stereo outputs and gain control for each output.
It is cascadable, i.e. it can be found at the adresses 0x98
and 0x9a 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 as 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 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/ioctl.h>
#include <linux/i2c.h>
#include <media/v4l2-device.h>
#include <media/v4l2-chip-ident.h>
#include <media/v4l2-i2c-drv.h>
#include "tea6420.h"
MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
MODULE_DESCRIPTION("tea6420 driver");
MODULE_LICENSE("GPL");
static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Debug level (0-1)");
/* make a connection between the input 'i' and the output 'o'
with gain 'g' (note: i = 6 means 'mute') */
static int tea6420_s_routing(struct v4l2_subdev *sd,
u32 i, u32 o, u32 config)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
int g = (o >> 4) & 0xf;
u8 byte;
int ret;
o &= 0xf;
v4l2_dbg(1, debug, sd, "i=%d, o=%d, g=%d\n", i, o, g);
/* check if the parameters are valid */
if (i < 1 || i > 6 || o < 1 || o > 4 || g < 0 || g > 6 || g % 2 != 0)
return -EINVAL;
byte = ((o - 1) << 5);
byte |= (i - 1);
/* to understand this, have a look at the tea6420-specs (p.5) */
switch (g) {
case 0:
byte |= (3 << 3);
break;
case 2:
byte |= (2 << 3);
break;
case 4:
byte |= (1 << 3);
break;
case 6:
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 0;
}
static int tea6420_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_TEA6420, 0);
}
/* ----------------------------------------------------------------------- */
static const struct v4l2_subdev_core_ops tea6420_core_ops = {
.g_chip_ident = tea6420_g_chip_ident,
};
static const struct v4l2_subdev_audio_ops tea6420_audio_ops = {
.s_routing = tea6420_s_routing,
};
static const struct v4l2_subdev_ops tea6420_ops = {
.core = &tea6420_core_ops,
.audio = &tea6420_audio_ops,
};
/* this function is called by i2c_probe */
static int tea6420_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct v4l2_subdev *sd;
int err, i;
/* let's see whether this adapter can support what we need */
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
return -EIO;
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, &tea6420_ops);
/* set initial values: set "mute"-input to all outputs at gain 0 */
err = 0;
for (i = 1; i < 5; i++)
err += tea6420_s_routing(sd, 6, i, 0);
if (err) {
v4l_dbg(1, debug, client, "could not initialize tea6420\n");
return -ENODEV;
}
return 0;
}
static int tea6420_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 tea6420_id[] = {
{ "tea6420", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tea6420_id);
static struct v4l2_i2c_driver_data v4l2_i2c_data = {
.name = "tea6420",
.probe = tea6420_probe,
.remove = tea6420_remove,
.id_table = tea6420_id,
};
|
