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Linus Torvalds1da177e2005-04-16 15:20:36 -07001 /*
2 tea6420 - i2c-driver for the tea6420 by SGS Thomson
3
4 Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
Hans Verkuila8327812008-07-25 10:31:23 -03005 Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006
7 The tea6420 is a bus controlled audio-matrix with 5 stereo inputs,
8 4 stereo outputs and gain control for each output.
Daniel Mack3ad2f3f2010-02-03 08:01:28 +08009 It is cascadable, i.e. it can be found at the addresses 0x98
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 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
Mauro Carvalho Chehaba8733ca2006-03-17 10:37:02 -030030
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/module.h>
32#include <linux/ioctl.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090033#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/i2c.h>
Hans Verkuil2a5b8282008-12-18 12:33:45 -030035#include <media/v4l2-device.h>
Hans Verkuil1b8dac12009-02-07 11:18:05 -030036#include <media/v4l2-chip-ident.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include "tea6420.h"
38
Hans Verkuila8327812008-07-25 10:31:23 -030039MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
40MODULE_DESCRIPTION("tea6420 driver");
41MODULE_LICENSE("GPL");
Hans Verkuilf87086e2008-07-18 00:50:58 -030042
Hans Verkuila8327812008-07-25 10:31:23 -030043static int debug;
44module_param(debug, int, 0644);
45
46MODULE_PARM_DESC(debug, "Debug level (0-1)");
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
Linus Torvalds1da177e2005-04-16 15:20:36 -070049/* make a connection between the input 'i' and the output 'o'
Hans Verkuil1b8dac12009-02-07 11:18:05 -030050 with gain 'g' (note: i = 6 means 'mute') */
Hans Verkuil5325b422009-04-02 11:26:22 -030051static int tea6420_s_routing(struct v4l2_subdev *sd,
52 u32 i, u32 o, u32 config)
Linus Torvalds1da177e2005-04-16 15:20:36 -070053{
Hans Verkuil1b8dac12009-02-07 11:18:05 -030054 struct i2c_client *client = v4l2_get_subdevdata(sd);
Hans Verkuil5325b422009-04-02 11:26:22 -030055 int g = (o >> 4) & 0xf;
Hans Verkuila8327812008-07-25 10:31:23 -030056 u8 byte;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 int ret;
58
Hans Verkuil5325b422009-04-02 11:26:22 -030059 o &= 0xf;
Hans Verkuil1b8dac12009-02-07 11:18:05 -030060 v4l2_dbg(1, debug, sd, "i=%d, o=%d, g=%d\n", i, o, g);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Joe Perchesc84e6032008-02-03 17:18:59 +020062 /* check if the parameters are valid */
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 if (i < 1 || i > 6 || o < 1 || o > 4 || g < 0 || g > 6 || g % 2 != 0)
Hans Verkuil1b8dac12009-02-07 11:18:05 -030064 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
Hans Verkuila8327812008-07-25 10:31:23 -030066 byte = ((o - 1) << 5);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 byte |= (i - 1);
68
69 /* to understand this, have a look at the tea6420-specs (p.5) */
70 switch (g) {
71 case 0:
72 byte |= (3 << 3);
73 break;
74 case 2:
75 byte |= (2 << 3);
76 break;
77 case 4:
78 byte |= (1 << 3);
79 break;
80 case 6:
81 break;
82 }
83
84 ret = i2c_smbus_write_byte(client, byte);
85 if (ret) {
Hans Verkuil1b8dac12009-02-07 11:18:05 -030086 v4l2_dbg(1, debug, sd,
Hans Verkuila8327812008-07-25 10:31:23 -030087 "i2c_smbus_write_byte() failed, ret:%d\n", ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 return -EIO;
89 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 return 0;
91}
92
Hans Verkuil1b8dac12009-02-07 11:18:05 -030093static int tea6420_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
Hans Verkuil2a5b8282008-12-18 12:33:45 -030094{
Hans Verkuil1b8dac12009-02-07 11:18:05 -030095 struct i2c_client *client = v4l2_get_subdevdata(sd);
Hans Verkuil2a5b8282008-12-18 12:33:45 -030096
Hans Verkuil1b8dac12009-02-07 11:18:05 -030097 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEA6420, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098}
99
Hans Verkuil2a5b8282008-12-18 12:33:45 -0300100/* ----------------------------------------------------------------------- */
101
102static const struct v4l2_subdev_core_ops tea6420_core_ops = {
Hans Verkuil1b8dac12009-02-07 11:18:05 -0300103 .g_chip_ident = tea6420_g_chip_ident,
104};
105
106static const struct v4l2_subdev_audio_ops tea6420_audio_ops = {
107 .s_routing = tea6420_s_routing,
Hans Verkuil2a5b8282008-12-18 12:33:45 -0300108};
109
110static const struct v4l2_subdev_ops tea6420_ops = {
111 .core = &tea6420_core_ops,
Hans Verkuil1b8dac12009-02-07 11:18:05 -0300112 .audio = &tea6420_audio_ops,
Hans Verkuil2a5b8282008-12-18 12:33:45 -0300113};
114
Hans Verkuila8327812008-07-25 10:31:23 -0300115static int tea6420_probe(struct i2c_client *client,
116 const struct i2c_device_id *id)
117{
Hans Verkuil2a5b8282008-12-18 12:33:45 -0300118 struct v4l2_subdev *sd;
Hans Verkuila8327812008-07-25 10:31:23 -0300119 int err, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Hans Verkuila8327812008-07-25 10:31:23 -0300121 /* let's see whether this adapter can support what we need */
122 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
123 return -EIO;
124
125 v4l_info(client, "chip found @ 0x%x (%s)\n",
126 client->addr << 1, client->adapter->name);
127
Herton Ronaldo Krzesinski80845a32011-04-01 14:12:02 -0300128 sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
Hans Verkuil1b8dac12009-02-07 11:18:05 -0300129 if (sd == NULL)
130 return -ENOMEM;
131 v4l2_i2c_subdev_init(sd, client, &tea6420_ops);
132
Hans Verkuila8327812008-07-25 10:31:23 -0300133 /* set initial values: set "mute"-input to all outputs at gain 0 */
134 err = 0;
Hans Verkuil5325b422009-04-02 11:26:22 -0300135 for (i = 1; i < 5; i++)
136 err += tea6420_s_routing(sd, 6, i, 0);
Hans Verkuila8327812008-07-25 10:31:23 -0300137 if (err) {
138 v4l_dbg(1, debug, client, "could not initialize tea6420\n");
Hans Verkuila8327812008-07-25 10:31:23 -0300139 return -ENODEV;
140 }
Hans Verkuil2a5b8282008-12-18 12:33:45 -0300141 return 0;
142}
143
144static int tea6420_remove(struct i2c_client *client)
145{
146 struct v4l2_subdev *sd = i2c_get_clientdata(client);
147
148 v4l2_device_unregister_subdev(sd);
149 kfree(sd);
Hans Verkuila8327812008-07-25 10:31:23 -0300150 return 0;
151}
152
Hans Verkuila8327812008-07-25 10:31:23 -0300153static const struct i2c_device_id tea6420_id[] = {
154 { "tea6420", 0 },
155 { }
156};
157MODULE_DEVICE_TABLE(i2c, tea6420_id);
158
Hans Verkuile2c52ba2010-09-15 15:41:23 -0300159static struct i2c_driver tea6420_driver = {
160 .driver = {
161 .owner = THIS_MODULE,
162 .name = "tea6420",
163 },
164 .probe = tea6420_probe,
165 .remove = tea6420_remove,
166 .id_table = tea6420_id,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167};
Hans Verkuile2c52ba2010-09-15 15:41:23 -0300168
169static __init int init_tea6420(void)
170{
171 return i2c_add_driver(&tea6420_driver);
172}
173
174static __exit void exit_tea6420(void)
175{
176 i2c_del_driver(&tea6420_driver);
177}
178
179module_init(init_tea6420);
180module_exit(exit_tea6420);