On Wed, 25 Nov 2009 12:18:05 +0800, Lanttor wrote: > Hi, > > I have a confused problem as follows: > > I instantiate a i2c device with function i2c_register_board_info(); > This function pre-declare the I2C devices which live on this bus and the > call of it > is before the real i2c bus driver loaded. > > In i2c_register_board_info(), > __i2c_first_dynamic_bus_num = busnum +1; > > My i2c bus driver use i2c_add_adapter() to register adapter, In > i2c_add_adapter(), > res = idr_get_new_above(&i2c_adapter_idr, adapter, > __i2c_first_dynamic_bus_num , &id); > > adapter->nr = id; > > That means if I pass busnum 0 to i2c_register_board_info(), but my i2c > adapter will get > busnum 1 and so it can't scan pre-declared i2c devices. > In fact, I only have one i2c adapter. > > It seems I can't use i2c_add_adapter(), instead of using > i2c_add_numbered_adapter, right? Yes, you are correct. You can't predefine I2C devices with i2c_register_board_info() if you don't also set I2C adapter numbers with i2c_add_numbered_adapter(). Trying would be equivalent to sending a letter to someone when you know the city and street number but not the street name: unlikely to succeed. -- Jean Delvare -- 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
