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Linus Torvalds1da177e2005-04-16 15:20:36 -07001 /*
2 tea6415c - i2c-driver for the tea6415c 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 tea6415c is a bus controlled video-matrix-switch
8 with 8 inputs and 6 outputs.
9 It is cascadable, i.e. it can be found at the addresses
10 0x86 and 0x06 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 vs 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 Mvss 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>
33#include <linux/i2c.h>
Hans Verkuila8327812008-07-25 10:31:23 -030034#include <media/v4l2-common.h>
35#include <media/v4l2-i2c-drv-legacy.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include "tea6415c.h"
37
Hans Verkuila8327812008-07-25 10:31:23 -030038MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
39MODULE_DESCRIPTION("tea6415c driver");
40MODULE_LICENSE("GPL");
41
42static int debug;
Linus Torvalds1da177e2005-04-16 15:20:36 -070043module_param(debug, int, 0644);
Hans Verkuilf87086e2008-07-18 00:50:58 -030044
Hans Verkuila8327812008-07-25 10:31:23 -030045MODULE_PARM_DESC(debug, "Debug level (0-1)");
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47/* addresses to scan, found only at 0x03 and/or 0x43 (7-bit) */
48static unsigned short normal_i2c[] = { I2C_TEA6415C_1, I2C_TEA6415C_2, I2C_CLIENT_END };
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
50/* magic definition of all other variables and things */
51I2C_CLIENT_INSMOD;
52
Linus Torvalds1da177e2005-04-16 15:20:36 -070053/* makes a connection between the input-pin 'i' and the output-pin 'o'
54 for the tea6415c-client 'client' */
55static int switch_matrix(struct i2c_client *client, int i, int o)
56{
57 u8 byte = 0;
58 int ret;
Mauro Carvalho Chehaba8733ca2006-03-17 10:37:02 -030059
Hans Verkuila8327812008-07-25 10:31:23 -030060 v4l_dbg(1, debug, client, "i=%d, o=%d\n", i, o);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62 /* check if the pins are valid */
63 if (0 == ((1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i)
64 && (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o)))
65 return -1;
66
67 /* to understand this, have a look at the tea6415c-specs (p.5) */
68 switch (o) {
69 case 18:
70 byte = 0x00;
71 break;
72 case 14:
73 byte = 0x20;
74 break;
75 case 16:
76 byte = 0x10;
77 break;
78 case 17:
79 byte = 0x08;
80 break;
81 case 15:
82 byte = 0x18;
83 break;
84 case 13:
85 byte = 0x28;
86 break;
87 };
88
89 switch (i) {
90 case 5:
91 byte |= 0x00;
92 break;
93 case 8:
94 byte |= 0x04;
95 break;
96 case 3:
97 byte |= 0x02;
98 break;
99 case 20:
100 byte |= 0x06;
101 break;
102 case 6:
103 byte |= 0x01;
104 break;
105 case 10:
106 byte |= 0x05;
107 break;
108 case 1:
109 byte |= 0x03;
110 break;
111 case 11:
112 byte |= 0x07;
113 break;
114 };
115
116 ret = i2c_smbus_write_byte(client, byte);
117 if (ret) {
Hans Verkuila8327812008-07-25 10:31:23 -0300118 v4l_dbg(1, debug, client,
119 "i2c_smbus_write_byte() failed, ret:%d\n", ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 return -EIO;
121 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 return ret;
123}
124
Hans Verkuila8327812008-07-25 10:31:23 -0300125static int tea6415c_command(struct i2c_client *client, unsigned cmd, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126{
127 struct tea6415c_multiplex *v = (struct tea6415c_multiplex *)arg;
128 int result = 0;
129
130 switch (cmd) {
131 case TEA6415C_SWITCH:
132 result = switch_matrix(client, v->in, v->out);
133 break;
134 default:
135 return -ENOIOCTLCMD;
136 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 return result;
138}
139
Hans Verkuila8327812008-07-25 10:31:23 -0300140/* this function is called by i2c_probe */
141static int tea6415c_probe(struct i2c_client *client,
142 const struct i2c_device_id *id)
143{
144 /* let's see whether this adapter can support what we need */
145 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
146 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
Hans Verkuila8327812008-07-25 10:31:23 -0300148 v4l_info(client, "chip found @ 0x%x (%s)\n",
149 client->addr << 1, client->adapter->name);
150 return 0;
151}
152
153static int tea6415c_legacy_probe(struct i2c_adapter *adapter)
154{
155 /* Let's see whether this is a known adapter we can attach to.
156 Prevents conflicts with tvaudio.c. */
157 return adapter->id == I2C_HW_SAA7146;
158}
159
160static const struct i2c_device_id tea6415c_id[] = {
161 { "tea6415c", 0 },
162 { }
163};
164MODULE_DEVICE_TABLE(i2c, tea6415c_id);
165
166static struct v4l2_i2c_driver_data v4l2_i2c_data = {
Jean Delvarefae91e72005-08-15 19:57:04 +0200167 .name = "tea6415c",
Hans Verkuila8327812008-07-25 10:31:23 -0300168 .driverid = I2C_DRIVERID_TEA6415C,
169 .command = tea6415c_command,
170 .probe = tea6415c_probe,
171 .legacy_probe = tea6415c_legacy_probe,
172 .id_table = tea6415c_id,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173};