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 long 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
,