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1da177e4 LT |
1 | /* |
2 | tea6420 - i2c-driver for the tea6420 by SGS Thomson | |
3 | ||
4 | Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de> | |
a832781c | 5 | Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl> |
1da177e4 LT |
6 | |
7 | The tea6420 is a bus controlled audio-matrix with 5 stereo inputs, | |
8 | 4 stereo outputs and gain control for each output. | |
3ad2f3fb | 9 | It is cascadable, i.e. it can be found at the addresses 0x98 |
1da177e4 LT |
10 | and 0x9a on the i2c-bus. |
11 | ||
12 | For detailed informations download the specifications directly | |
13 | from SGS Thomson at http://www.st.com | |
14 | ||
15 | This program is free software; you can redistribute it and/or modify | |
16 | it under the terms of the GNU General Public License as published by | |
17 | the Free Software Foundation; either version 2 of the License, or | |
18 | (at your option) any later version. | |
19 | ||
20 | This program is distributed in the hope that it will be useful, | |
21 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
23 | GNU General Public License for more details. | |
24 | ||
25 | You should have received a copy of the GNU General Public License | |
26 | along with this program; if not, write to the Free Software | |
27 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
28 | */ | |
29 | ||
a8733ca5 | 30 | |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | #include <linux/ioctl.h> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
1da177e4 | 34 | #include <linux/i2c.h> |
2a5b828d | 35 | #include <media/v4l2-device.h> |
1da177e4 LT |
36 | #include "tea6420.h" |
37 | ||
a832781c HV |
38 | MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); |
39 | MODULE_DESCRIPTION("tea6420 driver"); | |
40 | MODULE_LICENSE("GPL"); | |
41 | ||
42 | static int debug; | |
1da177e4 | 43 | module_param(debug, int, 0644); |
f87086e3 | 44 | |
a832781c | 45 | MODULE_PARM_DESC(debug, "Debug level (0-1)"); |
1da177e4 | 46 | |
1da177e4 | 47 | |
1da177e4 | 48 | /* make a connection between the input 'i' and the output 'o' |
1b8dac15 | 49 | with gain 'g' (note: i = 6 means 'mute') */ |
5325b427 HV |
50 | static int tea6420_s_routing(struct v4l2_subdev *sd, |
51 | u32 i, u32 o, u32 config) | |
1da177e4 | 52 | { |
1b8dac15 | 53 | struct i2c_client *client = v4l2_get_subdevdata(sd); |
5325b427 | 54 | int g = (o >> 4) & 0xf; |
a832781c | 55 | u8 byte; |
1da177e4 LT |
56 | int ret; |
57 | ||
5325b427 | 58 | o &= 0xf; |
1b8dac15 | 59 | v4l2_dbg(1, debug, sd, "i=%d, o=%d, g=%d\n", i, o, g); |
1da177e4 | 60 | |
c84e6036 | 61 | /* check if the parameters are valid */ |
1da177e4 | 62 | if (i < 1 || i > 6 || o < 1 || o > 4 || g < 0 || g > 6 || g % 2 != 0) |
1b8dac15 | 63 | return -EINVAL; |
1da177e4 | 64 | |
a832781c | 65 | byte = ((o - 1) << 5); |
1da177e4 LT |
66 | byte |= (i - 1); |
67 | ||
68 | /* to understand this, have a look at the tea6420-specs (p.5) */ | |
69 | switch (g) { | |
70 | case 0: | |
71 | byte |= (3 << 3); | |
72 | break; | |
73 | case 2: | |
74 | byte |= (2 << 3); | |
75 | break; | |
76 | case 4: | |
77 | byte |= (1 << 3); | |
78 | break; | |
79 | case 6: | |
80 | break; | |
81 | } | |
82 | ||
83 | ret = i2c_smbus_write_byte(client, byte); | |
84 | if (ret) { | |
1b8dac15 | 85 | v4l2_dbg(1, debug, sd, |
a832781c | 86 | "i2c_smbus_write_byte() failed, ret:%d\n", ret); |
1da177e4 LT |
87 | return -EIO; |
88 | } | |
1da177e4 LT |
89 | return 0; |
90 | } | |
91 | ||
2a5b828d HV |
92 | /* ----------------------------------------------------------------------- */ |
93 | ||
1b8dac15 HV |
94 | static const struct v4l2_subdev_audio_ops tea6420_audio_ops = { |
95 | .s_routing = tea6420_s_routing, | |
2a5b828d HV |
96 | }; |
97 | ||
98 | static const struct v4l2_subdev_ops tea6420_ops = { | |
1b8dac15 | 99 | .audio = &tea6420_audio_ops, |
2a5b828d HV |
100 | }; |
101 | ||
a832781c HV |
102 | static int tea6420_probe(struct i2c_client *client, |
103 | const struct i2c_device_id *id) | |
104 | { | |
2a5b828d | 105 | struct v4l2_subdev *sd; |
a832781c | 106 | int err, i; |
1da177e4 | 107 | |
a832781c HV |
108 | /* let's see whether this adapter can support what we need */ |
109 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) | |
110 | return -EIO; | |
111 | ||
112 | v4l_info(client, "chip found @ 0x%x (%s)\n", | |
113 | client->addr << 1, client->adapter->name); | |
1da177e4 | 114 | |
c02b211d | 115 | sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL); |
1b8dac15 HV |
116 | if (sd == NULL) |
117 | return -ENOMEM; | |
118 | v4l2_i2c_subdev_init(sd, client, &tea6420_ops); | |
119 | ||
1da177e4 LT |
120 | /* set initial values: set "mute"-input to all outputs at gain 0 */ |
121 | err = 0; | |
5325b427 HV |
122 | for (i = 1; i < 5; i++) |
123 | err += tea6420_s_routing(sd, 6, i, 0); | |
1da177e4 | 124 | if (err) { |
a832781c | 125 | v4l_dbg(1, debug, client, "could not initialize tea6420\n"); |
1da177e4 LT |
126 | return -ENODEV; |
127 | } | |
2a5b828d HV |
128 | return 0; |
129 | } | |
130 | ||
131 | static int tea6420_remove(struct i2c_client *client) | |
132 | { | |
133 | struct v4l2_subdev *sd = i2c_get_clientdata(client); | |
134 | ||
135 | v4l2_device_unregister_subdev(sd); | |
1da177e4 LT |
136 | return 0; |
137 | } | |
138 | ||
a832781c HV |
139 | static const struct i2c_device_id tea6420_id[] = { |
140 | { "tea6420", 0 }, | |
141 | { } | |
1da177e4 | 142 | }; |
a832781c | 143 | MODULE_DEVICE_TABLE(i2c, tea6420_id); |
1da177e4 | 144 | |
e2c52ba6 HV |
145 | static struct i2c_driver tea6420_driver = { |
146 | .driver = { | |
e2c52ba6 HV |
147 | .name = "tea6420", |
148 | }, | |
149 | .probe = tea6420_probe, | |
150 | .remove = tea6420_remove, | |
151 | .id_table = tea6420_id, | |
1da177e4 | 152 | }; |
e2c52ba6 | 153 | |
c6e8d86f | 154 | module_i2c_driver(tea6420_driver); |