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authorHans Verkuil <hverkuil@xs4all.nl>2007-09-12 07:32:50 -0400
committerMauro Carvalho Chehab <mchehab@infradead.org>2008-01-25 16:01:16 -0500
commit8ffbc6559493c64d6194c92d856196fdaeb8a5fb (patch)
treeb279073efa70f56cf6f0614a6a96374464e492ec /include/media/v4l2-i2c-drv.h
parent5ef4730d1bfe5be71ce54d927c510ad5da968854 (diff)
V4L/DVB (6451): v4l2: add support for bus-based I2C drivers
Two new headers were added: one for I2C drivers that are only used by V4L2 drivers converted to the new bus-based I2C API, and one that can be used by both converted and unconverted drivers (at the expense of some additional overhead). To support the legacy I2C API a helper function was added to v4l2-common.c. These headers take care of all the 'boilerplate' code that all V4L2 I2C drivers have in common and will automatically support the bus-based I2C API introduced in kernel 2.6.22. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'include/media/v4l2-i2c-drv.h')
-rw-r--r--include/media/v4l2-i2c-drv.h61
1 files changed, 61 insertions, 0 deletions
diff --git a/include/media/v4l2-i2c-drv.h b/include/media/v4l2-i2c-drv.h
new file mode 100644
index 000000000000..547db60d3640
--- /dev/null
+++ b/include/media/v4l2-i2c-drv.h
@@ -0,0 +1,61 @@
1/*
2 * v4l2-i2c-drv.h - contains I2C handling code that's identical for
3 * all V4L2 I2C drivers. Use this header if the
4 * I2C driver is only used by drivers converted
5 * to the bus-based I2C API.
6 *
7 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
24struct v4l2_i2c_driver_data {
25 const char * const name;
26 int driverid;
27 int (*command)(struct i2c_client *client, unsigned int cmd, void *arg);
28 int (*probe)(struct i2c_client *client);
29 int (*remove)(struct i2c_client *client);
30 int (*suspend)(struct i2c_client *client, pm_message_t state);
31 int (*resume)(struct i2c_client *client);
32 int legacy_class;
33};
34
35static struct v4l2_i2c_driver_data v4l2_i2c_data;
36static struct i2c_client_address_data addr_data;
37static struct i2c_driver v4l2_i2c_driver;
38
39
40/* Bus-based I2C implementation for kernels >= 2.6.22 */
41
42static int __init v4l2_i2c_drv_init(void)
43{
44 v4l2_i2c_driver.driver.name = v4l2_i2c_data.name;
45 v4l2_i2c_driver.id = v4l2_i2c_data.driverid;
46 v4l2_i2c_driver.command = v4l2_i2c_data.command;
47 v4l2_i2c_driver.probe = v4l2_i2c_data.probe;
48 v4l2_i2c_driver.remove = v4l2_i2c_data.remove;
49 v4l2_i2c_driver.suspend = v4l2_i2c_data.suspend;
50 v4l2_i2c_driver.resume = v4l2_i2c_data.resume;
51 return i2c_add_driver(&v4l2_i2c_driver);
52}
53
54
55static void __exit v4l2_i2c_drv_cleanup(void)
56{
57 i2c_del_driver(&v4l2_i2c_driver);
58}
59
60module_init(v4l2_i2c_drv_init);
61module_exit(v4l2_i2c_drv_cleanup);