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 older kernels as well.
  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
  35 #ifndef __V4L2_I2C_DRV_H__
  36 #define __V4L2_I2C_DRV_H__
  37
  38 #include <media/v4l2-common.h>
  39
  40 struct v4l2_i2c_driver_data {
  41         const char * const name;
  42         int (*command)(struct i2c_client *client, unsigned int cmd, void *arg);
  43         int (*probe)(struct i2c_client *client, const struct i2c_device_id *id);
  44         int (*remove)(struct i2c_client *client);
  45         int (*suspend)(struct i2c_client *client, pm_message_t state);
  46         int (*resume)(struct i2c_client *client);
  47         const struct i2c_device_id *id_table;
  48 };
  49
  50 static struct v4l2_i2c_driver_data v4l2_i2c_data;
  51 static struct i2c_driver v4l2_i2c_driver;
  52
  53
  54 /* Bus-based I2C implementation for kernels >= 2.6.22 */
  55
  56 static int __init v4l2_i2c_drv_init(void)
  57 {
  58         v4l2_i2c_driver.driver.name = v4l2_i2c_data.name;
  59         v4l2_i2c_driver.command = v4l2_i2c_data.command;
  60         v4l2_i2c_driver.probe = v4l2_i2c_data.probe;
  61         v4l2_i2c_driver.remove = v4l2_i2c_data.remove;
  62         v4l2_i2c_driver.suspend = v4l2_i2c_data.suspend;
  63         v4l2_i2c_driver.resume = v4l2_i2c_data.resume;
  64         v4l2_i2c_driver.id_table = v4l2_i2c_data.id_table;
  65         return i2c_add_driver(&v4l2_i2c_driver);
  66 }
  67
  68
  69 static void __exit v4l2_i2c_drv_cleanup(void)
  70 {
  71         i2c_del_driver(&v4l2_i2c_driver);
  72 }
  73
  74 module_init(v4l2_i2c_drv_init);
  75 module_exit(v4l2_i2c_drv_cleanup);
  76
  77 #endif /* __V4L2_I2C_DRV_H__ */