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
  15 #include <linux/rwsem.h>
  16
  17 struct i2c_devinfo {
  18         struct list_head        list;
  19         int                     busnum;
  20         struct i2c_board_info   board_info;
  21 };
  22
  23 /* board_lock protects board_list and first_dynamic_bus_num.
  24  * only i2c core components are allowed to use these symbols.
  25  */
  26 extern struct rw_semaphore      __i2c_board_lock;
  27 extern struct list_head __i2c_board_list;
  28 extern int              __i2c_first_dynamic_bus_num;
  29
  30 int i2c_check_addr_validity(unsigned addr, unsigned short flags);
  31 int i2c_check_7bit_addr_validity_strict(unsigned short addr);
  32
  33 #ifdef CONFIG_ACPI
  34 const struct acpi_device_id *
  35 i2c_acpi_match_device(const struct acpi_device_id *matches,
  36                       struct i2c_client *client);
  37 void i2c_acpi_register_devices(struct i2c_adapter *adap);
  38 #else /* CONFIG_ACPI */
  39 static inline void i2c_acpi_register_devices(struct i2c_adapter *adap) { }
  40 static inline const struct acpi_device_id *
  41 i2c_acpi_match_device(const struct acpi_device_id *matches,
  42                       struct i2c_client *client)
  43 {
  44         return NULL;
  45 }
  46 #endif /* CONFIG_ACPI */
  47 extern struct notifier_block i2c_acpi_notifier;
  48
  49 #ifdef CONFIG_ACPI_I2C_OPREGION
  50 int i2c_acpi_install_space_handler(struct i2c_adapter *adapter);
  51 void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter);
  52 #else /* CONFIG_ACPI_I2C_OPREGION */
  53 static inline int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) { return 0; }
  54 static inline void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) { }
  55 #endif /* CONFIG_ACPI_I2C_OPREGION */
  56
  57 #ifdef CONFIG_OF
  58 void of_i2c_register_devices(struct i2c_adapter *adap);
  59 #else
  60 static inline void of_i2c_register_devices(struct i2c_adapter *adap) { }
  61 #endif
  62 extern struct notifier_block i2c_of_notifier;