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i2c: Only include slave support if selected

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Make the slave support depend on CONFIG_I2C_SLAVE. Otherwise it gets
included unconditionally, even when it is not needed.

I2C bus drivers which implement slave support must select
I2C_SLAVE.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Jean Delvare 2015-01-26 20:59:31 +01:00 committed by Wolfram Sang
parent 34e81ad5f0
commit d5fd120e78
3 changed files with 9 additions and 0 deletions
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1
drivers/i2c/busses/Kconfig
View file

@ -881,6 +881,7 @@ config I2C_XLR
config I2C_RCAR
tristate "Renesas R-Car I2C Controller"
depends on ARCH_SHMOBILE || COMPILE_TEST
select I2C_SLAVE
help
If you say yes to this option, support will be included for the
R-Car I2C controller.

2
drivers/i2c/i2c-core.c
View file

@ -2972,6 +2972,7 @@ s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, unsigned short flags,
}
EXPORT_SYMBOL(i2c_smbus_xfer);
#if IS_ENABLED(CONFIG_I2C_SLAVE)
int i2c_slave_register(struct i2c_client *client, i2c_slave_cb_t slave_cb)
{
int ret;
@ -3019,6 +3020,7 @@ int i2c_slave_unregister(struct i2c_client *client)
return ret;
}
EXPORT_SYMBOL_GPL(i2c_slave_unregister);
#endif
MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>");
MODULE_DESCRIPTION("I2C-Bus main module");

6
include/linux/i2c.h
View file

@ -228,7 +228,9 @@ struct i2c_client {
struct device dev; /* the device structure */
int irq; /* irq issued by device */
struct list_head detected;
#if IS_ENABLED(CONFIG_I2C_SLAVE)
i2c_slave_cb_t slave_cb; /* callback for slave mode */
#endif
};
#define to_i2c_client(d) container_of(d, struct i2c_client, dev)
@ -253,6 +255,7 @@ static inline void i2c_set_clientdata(struct i2c_client *dev, void *data)
/* I2C slave support */
#if IS_ENABLED(CONFIG_I2C_SLAVE)
enum i2c_slave_event {
I2C_SLAVE_REQ_READ_START,
I2C_SLAVE_REQ_READ_END,
@ -269,6 +272,7 @@ static inline int i2c_slave_event(struct i2c_client *client,
{
return client->slave_cb(client, event, val);
}
#endif
/**
* struct i2c_board_info - template for device creation
@ -404,8 +408,10 @@ struct i2c_algorithm {
/* To determine what the adapter supports */
u32 (*functionality) (struct i2c_adapter *);
#if IS_ENABLED(CONFIG_I2C_SLAVE)
int (*reg_slave)(struct i2c_client *client);
int (*unreg_slave)(struct i2c_client *client);
#endif
};
/**