Linux 3.11-rc3
[cris-mirror.git] / drivers / media / i2c / tea6420.c
blob30a8d75771af9622ac006c90f2dd660346af0dab
1 /*
2 tea6420 - i2c-driver for the tea6420 by SGS Thomson
4 Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
5 Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
7 The tea6420 is a bus controlled audio-matrix with 5 stereo inputs,
8 4 stereo outputs and gain control for each output.
9 It is cascadable, i.e. it can be found at the addresses 0x98
10 and 0x9a on the i2c-bus.
12 For detailed informations download the specifications directly
13 from SGS Thomson at http://www.st.com
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.
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.
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.
31 #include <linux/module.h>
32 #include <linux/ioctl.h>
33 #include <linux/slab.h>
34 #include <linux/i2c.h>
35 #include <media/v4l2-device.h>
36 #include "tea6420.h"
38 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
39 MODULE_DESCRIPTION("tea6420 driver");
40 MODULE_LICENSE("GPL");
42 static int debug;
43 module_param(debug, int, 0644);
45 MODULE_PARM_DESC(debug, "Debug level (0-1)");
48 /* make a connection between the input 'i' and the output 'o'
49 with gain 'g' (note: i = 6 means 'mute') */
50 static int tea6420_s_routing(struct v4l2_subdev *sd,
51 u32 i, u32 o, u32 config)
53 struct i2c_client *client = v4l2_get_subdevdata(sd);
54 int g = (o >> 4) & 0xf;
55 u8 byte;
56 int ret;
58 o &= 0xf;
59 v4l2_dbg(1, debug, sd, "i=%d, o=%d, g=%d\n", i, o, g);
61 /* check if the parameters are valid */
62 if (i < 1 || i > 6 || o < 1 || o > 4 || g < 0 || g > 6 || g % 2 != 0)
63 return -EINVAL;
65 byte = ((o - 1) << 5);
66 byte |= (i - 1);
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;
83 ret = i2c_smbus_write_byte(client, byte);
84 if (ret) {
85 v4l2_dbg(1, debug, sd,
86 "i2c_smbus_write_byte() failed, ret:%d\n", ret);
87 return -EIO;
89 return 0;
92 /* ----------------------------------------------------------------------- */
94 static const struct v4l2_subdev_audio_ops tea6420_audio_ops = {
95 .s_routing = tea6420_s_routing,
98 static const struct v4l2_subdev_ops tea6420_ops = {
99 .audio = &tea6420_audio_ops,
102 static int tea6420_probe(struct i2c_client *client,
103 const struct i2c_device_id *id)
105 struct v4l2_subdev *sd;
106 int err, i;
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;
112 v4l_info(client, "chip found @ 0x%x (%s)\n",
113 client->addr << 1, client->adapter->name);
115 sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
116 if (sd == NULL)
117 return -ENOMEM;
118 v4l2_i2c_subdev_init(sd, client, &tea6420_ops);
120 /* set initial values: set "mute"-input to all outputs at gain 0 */
121 err = 0;
122 for (i = 1; i < 5; i++)
123 err += tea6420_s_routing(sd, 6, i, 0);
124 if (err) {
125 v4l_dbg(1, debug, client, "could not initialize tea6420\n");
126 return -ENODEV;
128 return 0;
131 static int tea6420_remove(struct i2c_client *client)
133 struct v4l2_subdev *sd = i2c_get_clientdata(client);
135 v4l2_device_unregister_subdev(sd);
136 return 0;
139 static const struct i2c_device_id tea6420_id[] = {
140 { "tea6420", 0 },
143 MODULE_DEVICE_TABLE(i2c, tea6420_id);
145 static struct i2c_driver tea6420_driver = {
146 .driver = {
147 .owner = THIS_MODULE,
148 .name = "tea6420",
150 .probe = tea6420_probe,
151 .remove = tea6420_remove,
152 .id_table = tea6420_id,
155 module_i2c_driver(tea6420_driver);