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[karo-tx-linux.git] / 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;