Hi, I think you can config the kernel using make menuconfig command, go to Device Driver--->I2C Suppport Check what you want to disselect. -----Original Message----- From: linux-i2c-owner@xxxxxxxxxxxxxxx [mailto:linux-i2c-owner@xxxxxxxxxxxxxxx] On Behalf Of kuninori.morimoto.gx@xxxxxxxxxxx Sent: Monday, June 27, 2011 3:00 PM To: Linux-I2C Subject: Question about i2c_xxx function on CONFIG_I2C Dear all I'm using i2c_xxx function on some board. And sometimes I need very small kernel which doesn't need CONFIG_I2C. But then (.config doesn't have CONFIG_I2C), the compile will fail. like this error: implicit declaration of function 'i2c_get_adapter' error: implicit declaration of function 'i2c_transfer' In this case, should I use #ifdef CONFIG_I2C in my code to solve this compile issue ? Or is below #else in i2c.h good idea ? --- i2c.h --------- #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) ... extern struct i2c_adapter *i2c_get_adapter(int nr); ... #else ... #define i2c_get_adapter(nr) NULL ... #endif Best regards --- Kuninori Morimoto -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
