diff options
Diffstat (limited to 'include/linux/i2c.h')
| -rw-r--r-- | include/linux/i2c.h | 43 |
1 files changed, 35 insertions, 8 deletions
diff --git a/include/linux/i2c.h b/include/linux/i2c.h index a6c652ef516..8e25a9167f1 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -28,12 +28,12 @@ #include <linux/types.h> #ifdef __KERNEL__ -#include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/device.h> /* for struct device */ #include <linux/sched.h> /* for completion */ #include <linux/mutex.h> #include <linux/of.h> /* for struct device_node */ +#include <linux/swab.h> /* for swab16 */ extern struct bus_type i2c_bus_type; extern struct device_type i2c_adapter_type; @@ -48,6 +48,8 @@ struct i2c_driver; union i2c_smbus_data; struct i2c_board_info; +struct module; + #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) /* * The master routines are the ones normally used to transmit data to devices @@ -88,6 +90,22 @@ extern s32 i2c_smbus_read_word_data(const struct i2c_client *client, u8 command); extern s32 i2c_smbus_write_word_data(const struct i2c_client *client, u8 command, u16 value); + +static inline s32 +i2c_smbus_read_word_swapped(const struct i2c_client *client, u8 command) +{ + s32 value = i2c_smbus_read_word_data(client, command); + + return (value < 0) ? value : swab16(value); +} + +static inline s32 +i2c_smbus_write_word_swapped(const struct i2c_client *client, + u8 command, u16 value) +{ + return i2c_smbus_write_word_data(client, command, swab16(value)); +} + /* Returns the number of read bytes */ extern s32 i2c_smbus_read_block_data(const struct i2c_client *client, u8 command, u8 *values); @@ -414,9 +432,6 @@ void i2c_unlock_adapter(struct i2c_adapter *); /* Internal numbers to terminate lists */ #define I2C_CLIENT_END 0xfffeU -/* The numbers to use to set I2C bus address */ -#define ANY_I2C_BUS 0xffff - /* Construct an I2C_CLIENT_END-terminated array of i2c addresses */ #define I2C_ADDRS(addr, addrs...) \ ((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END }) @@ -434,10 +449,9 @@ extern int i2c_add_numbered_adapter(struct i2c_adapter *); extern int i2c_register_driver(struct module *, struct i2c_driver *); extern void i2c_del_driver(struct i2c_driver *); -static inline int i2c_add_driver(struct i2c_driver *driver) -{ - return i2c_register_driver(THIS_MODULE, driver); -} +/* use a define to avoid include chaining to get THIS_MODULE */ +#define i2c_add_driver(driver) \ + i2c_register_driver(THIS_MODULE, driver) extern struct i2c_client *i2c_use_client(struct i2c_client *client); extern void i2c_release_client(struct i2c_client *client); @@ -468,6 +482,19 @@ static inline int i2c_adapter_id(struct i2c_adapter *adap) { return adap->nr; } + +/** + * module_i2c_driver() - Helper macro for registering a I2C driver + * @__i2c_driver: i2c_driver struct + * + * Helper macro for I2C drivers which do not do anything special in module + * init/exit. This eliminates a lot of boilerplate. Each module may only + * use this macro once, and calling it replaces module_init() and module_exit() + */ +#define module_i2c_driver(__i2c_driver) \ + module_driver(__i2c_driver, i2c_add_driver, \ + i2c_del_driver) + #endif /* I2C */ #endif /* __KERNEL__ */ |