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i2c: Don't advertise i2c functions when not available 

Surround i2c function declarations with ifdefs, so that they aren't
advertised when i2c-core isn't actually built. That way, drivers using
these functions unconditionally will result in an immediate build
failure, rather than a late linking failure which is harder to figure
out.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Jean Delvare 2009-06-19 16:58:20 +02:00
parent f18c41daea
commit 23af840057
1 changed files with 7 additions and 1 deletions
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8
include/linux/i2c.h
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@ -47,6 +47,7 @@ struct i2c_driver;
union i2c_smbus_data;
struct i2c_board_info;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
/*
* The master routines are the ones normally used to transmit data to devices
* on a bus (or read from them). Apart from two basic transfer functions to
@ -93,6 +94,7 @@ extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client,
extern s32 i2c_smbus_write_i2c_block_data(struct i2c_client *client,
u8 command, u8 length,
const u8 *values);
#endif /* I2C */
/**
* struct i2c_driver - represent an I2C device driver
@ -260,6 +262,7 @@ struct i2c_board_info {
.type = dev_type, .addr = (dev_addr)
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
/* Add-on boards should register/unregister their devices; e.g. a board
* with integrated I2C, a config eeprom, sensors, and a codec that's
* used in conjunction with the primary hardware.
@ -283,6 +286,7 @@ extern struct i2c_client *
i2c_new_dummy(struct i2c_adapter *adap, u16 address);
extern void i2c_unregister_device(struct i2c_client *);
#endif /* I2C */
/* Mainboard arch_initcall() code should register all its I2C devices.
* This is done at arch_initcall time, before declaring any i2c adapters.
@ -299,7 +303,7 @@ i2c_register_board_info(int busnum, struct i2c_board_info const *info,
{
return 0;
}
#endif
#endif /* I2C_BOARDINFO */
/*
* The following structs are for those who like to implement new bus drivers:
@ -394,6 +398,7 @@ struct i2c_client_address_data {
/* administration...
*/
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
extern int i2c_add_adapter(struct i2c_adapter *);
extern int i2c_del_adapter(struct i2c_adapter *);
extern int i2c_add_numbered_adapter(struct i2c_adapter *);
@ -435,6 +440,7 @@ static inline int i2c_adapter_id(struct i2c_adapter *adap)
{
return adap->nr;
}
#endif /* I2C */
#endif /* __KERNEL__ */
/**