I2C地址限制

在调试一个I2C触摸屏的驱动时，它的I2C地址为0X01，最后查找发现在\linux-3.0\drivers\i2c\i2c-core.c中有检测I2C地址是否可用
就是下面的函数：
/* And this is a strict address validity check, used when probing. If a
 * device uses a reserved address, then it shouldn't be probed. 7-bit
 * addressing is assumed, 10-bit address devices are rare and should be
 * explicitly enumerated. */
static int i2c_check_addr_validity(unsigned short addr)
 
/*
* Reserved addresses per I2C specification:
*  0x00       General call address / START byte
*  0x01       CBUS address
*  0x02       Reserved for different bus format
*  0x03       Reserved for future purposes
*  0x04-0x07  Hs-mode master code
*  0x78-0x7b  10-bit slave addressing
*  0x7c-0x7f  Reserved for future purposes
*/
#if !defined(CONFIG_ARCH_SUN4I)
if (addr < 0x08 || addr > 0x77)
#else
    if (addr < 0x03 || addr > 0x77)
#endif
        return -EINVAL;
return 0;
}
 
同样在linux2.6.36 中也存在I2C地址的合法性的检测 \linux-3.0\drivers\i2c\i2c-core.c中
 
 
/* Make sure the address is valid */
if (addr < 0x03 || addr > 0x77) {
dev_warn(&adapter->dev, "Invalid probe address 0x%02x\n",
addr);
return -EINVAL;
}

补充：移动开发 , Android ,