From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lanttor Subject: i2c adapter scan device issue Date: Wed, 25 Nov 2009 12:18:05 +0800 Message-ID: <4B0CAFFD.7030603@freescale.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Sender: linux-i2c-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-i2c@vger.kernel.org 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? Best Regards, Lanttor