release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/i2c/i2c-core.h

   1 /*
   2  * i2c-core.h - interfaces internal to the I2C framework
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 #include <linux/rwsem.h>
  20
  21 struct i2c_devinfo {
  22         struct list_head        list;
  23         int                     busnum;
  24         struct i2c_board_info   board_info;
  25 };
  26
  27 /* board_lock protects board_list and first_dynamic_bus_num.
  28  * only i2c core components are allowed to use these symbols.
  29  */
  30 extern struct rw_semaphore      __i2c_board_lock;
  31 extern struct list_head __i2c_board_list;
  32 extern int              __i2c_first_dynamic_bus_num;