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/slab.h>
34 #include <linux/i2c.h>
35 #include <media/v4l2-device.h>
36 #include <media/v4l2-chip-ident.h>
37 #include <media/v4l2-i2c-drv.h>
40 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
41 MODULE_DESCRIPTION("tea6415c driver");
42 MODULE_LICENSE("GPL");
45 module_param(debug, int, 0644);
47 MODULE_PARM_DESC(debug, "Debug level (0-1)");
50 /* makes a connection between the input-pin 'i' and the output-pin 'o' */
51 static int tea6415c_s_routing(struct v4l2_subdev *sd,
52 u32 i, u32 o, u32 config)
54 struct i2c_client *client = v4l2_get_subdevdata(sd);
58 v4l2_dbg(1, debug, sd, "i=%d, o=%d\n", i, o);
60 /* check if the pins are valid */
61 if (0 == ((1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i)
62 && (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o)))
65 /* to understand this, have a look at the tea6415c-specs (p.5) */
114 ret = i2c_smbus_write_byte(client, byte);
116 v4l2_dbg(1, debug, sd,
117 "i2c_smbus_write_byte() failed, ret:%d\n", ret);
123 static int tea6415c_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
125 struct i2c_client *client = v4l2_get_subdevdata(sd);
127 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEA6415C, 0);
130 /* ----------------------------------------------------------------------- */
132 static const struct v4l2_subdev_core_ops tea6415c_core_ops = {
133 .g_chip_ident = tea6415c_g_chip_ident,
136 static const struct v4l2_subdev_video_ops tea6415c_video_ops = {
137 .s_routing = tea6415c_s_routing,
140 static const struct v4l2_subdev_ops tea6415c_ops = {
141 .core = &tea6415c_core_ops,
142 .video = &tea6415c_video_ops,
145 static int tea6415c_probe(struct i2c_client *client,
146 const struct i2c_device_id *id)
148 struct v4l2_subdev *sd;
150 /* let's see whether this adapter can support what we need */
151 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
154 v4l_info(client, "chip found @ 0x%x (%s)\n",
155 client->addr << 1, client->adapter->name);
156 sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
159 v4l2_i2c_subdev_init(sd, client, &tea6415c_ops);
163 static int tea6415c_remove(struct i2c_client *client)
165 struct v4l2_subdev *sd = i2c_get_clientdata(client);
167 v4l2_device_unregister_subdev(sd);
172 static const struct i2c_device_id tea6415c_id[] = {
176 MODULE_DEVICE_TABLE(i2c, tea6415c_id);
178 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
180 .probe = tea6415c_probe,
181 .remove = tea6415c_remove,
182 .id_table = tea6415c_id,