include/media/v4l2-i2c-drv.h

   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
  24 /* NOTE: the full version of this header is in the v4l-dvb repository
  25  * and allows v4l i2c drivers to be compiled on pre-2.6.26 kernels.
  26  * The version of this header as it appears in the kernel is a stripped
  27  * version (without all the backwards compatibility stuff) and so it
  28  * looks a bit odd.
  29  *
  30  * If you look at the full version then you will understand the reason
  31  * for introducing this header since you really don't want to have all
  32  * the tricky backwards compatibility code in each and every i2c driver.
  33  *
  34  * If the i2c driver will never be compiled for pre-2.6.26 kernels, then
  35  * DO NOT USE this header! Just write it as a regular i2c driver.
  36  */
  37
  38 #ifndef __V4L2_I2C_DRV_H__
  39 #define __V4L2_I2C_DRV_H__
  40
  41 #include <media/v4l2-common.h>
  42
  43 struct v4l2_i2c_driver_data {
  44         const char * const name;
  45         int (*command)(struct i2c_client *client, unsigned int cmd, void *arg);
  46         int (*probe)(struct i2c_client *client, const struct i2c_device_id *id);
  47         int (*remove)(struct i2c_client *client);
  48         int (*suspend)(struct i2c_client *client, pm_message_t state);
  49         int (*resume)(struct i2c_client *client);
  50         const struct i2c_device_id *id_table;
  51 };
  52
  53 static struct v4l2_i2c_driver_data v4l2_i2c_data;
  54 static struct i2c_driver v4l2_i2c_driver;
  55
  56
  57 /* Bus-based I2C implementation for kernels >= 2.6.26 */
  58
  59 static int __init v4l2_i2c_drv_init(void)
  60 {
  61         v4l2_i2c_driver.driver.name = v4l2_i2c_data.name;
  62         v4l2_i2c_driver.command = v4l2_i2c_data.command;
  63         v4l2_i2c_driver.probe = v4l2_i2c_data.probe;
  64         v4l2_i2c_driver.remove = v4l2_i2c_data.remove;
  65         v4l2_i2c_driver.suspend = v4l2_i2c_data.suspend;
  66         v4l2_i2c_driver.resume = v4l2_i2c_data.resume;
  67         v4l2_i2c_driver.id_table = v4l2_i2c_data.id_table;
  68         return i2c_add_driver(&v4l2_i2c_driver);
  69 }
  70
  71
  72 static void __exit v4l2_i2c_drv_cleanup(void)
  73 {
  74         i2c_del_driver(&v4l2_i2c_driver);
  75 }
  76
  77 module_init(v4l2_i2c_drv_init);
  78 module_exit(v4l2_i2c_drv_cleanup);
  79
  80 #endif /* __V4L2_I2C_DRV_H__ */