2 tea6415c - i2c-driver for the tea6415c by SGS Thomson
4 Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
5 Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
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.
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 vs 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 Mvss Ave, Cambridge, MA 02139, USA.
31 #include <linux/module.h>
32 #include <linux/ioctl.h>
33 #include <linux/i2c.h>
34 #include <media/v4l2-device.h>
35 #include <media/v4l2-i2c-drv-legacy.h>
38 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
39 MODULE_DESCRIPTION("tea6415c driver");
40 MODULE_LICENSE("GPL");
43 module_param(debug, int, 0644);
45 MODULE_PARM_DESC(debug, "Debug level (0-1)");
47 /* addresses to scan, found only at 0x03 and/or 0x43 (7-bit) */
48 static unsigned short normal_i2c[] = { I2C_TEA6415C_1, I2C_TEA6415C_2, I2C_CLIENT_END };
50 /* magic definition of all other variables and things */
53 /* makes a connection between the input-pin 'i' and the output-pin 'o'
54 for the tea6415c-client 'client' */
55 static int switch_matrix(struct i2c_client *client, int i, int o)
60 v4l_dbg(1, debug, client, "i=%d, o=%d\n", i, o);
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)))
67 /* to understand this, have a look at the tea6415c-specs (p.5) */
116 ret = i2c_smbus_write_byte(client, byte);
118 v4l_dbg(1, debug, client,
119 "i2c_smbus_write_byte() failed, ret:%d\n", ret);
125 static int tea6415c_ioctl(struct v4l2_subdev *sd, unsigned cmd, void *arg)
127 if (cmd == TEA6415C_SWITCH) {
128 struct i2c_client *client = v4l2_get_subdevdata(sd);
129 struct tea6415c_multiplex *v = (struct tea6415c_multiplex *)arg;
131 return switch_matrix(client, v->in, v->out);
136 static int tea6415c_command(struct i2c_client *client, unsigned cmd, void *arg)
138 return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
141 /* ----------------------------------------------------------------------- */
143 static const struct v4l2_subdev_core_ops tea6415c_core_ops = {
144 .ioctl = tea6415c_ioctl,
147 static const struct v4l2_subdev_ops tea6415c_ops = {
148 .core = &tea6415c_core_ops,
151 /* this function is called by i2c_probe */
152 static int tea6415c_probe(struct i2c_client *client,
153 const struct i2c_device_id *id)
155 struct v4l2_subdev *sd;
157 /* let's see whether this adapter can support what we need */
158 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
161 v4l_info(client, "chip found @ 0x%x (%s)\n",
162 client->addr << 1, client->adapter->name);
163 sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
166 v4l2_i2c_subdev_init(sd, client, &tea6415c_ops);
170 static int tea6415c_remove(struct i2c_client *client)
172 struct v4l2_subdev *sd = i2c_get_clientdata(client);
174 v4l2_device_unregister_subdev(sd);
179 static int tea6415c_legacy_probe(struct i2c_adapter *adapter)
181 /* Let's see whether this is a known adapter we can attach to.
182 Prevents conflicts with tvaudio.c. */
183 return adapter->id == I2C_HW_SAA7146;
186 static const struct i2c_device_id tea6415c_id[] = {
190 MODULE_DEVICE_TABLE(i2c, tea6415c_id);
192 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
194 .driverid = I2C_DRIVERID_TEA6415C,
195 .command = tea6415c_command,
196 .probe = tea6415c_probe,
197 .remove = tea6415c_remove,
198 .legacy_probe = tea6415c_legacy_probe,
199 .id_table = tea6415c_id,