From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756385AbcIPVJJ (ORCPT ); Fri, 16 Sep 2016 17:09:09 -0400 Received: from vern.gendns.com ([206.190.152.46]:39768 "EHLO vern.gendns.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751083AbcIPVJC (ORCPT ); Fri, 16 Sep 2016 17:09:02 -0400 Subject: Re: [PATCH 3/3] i2c: expose adapter probe and remove probed functions To: Wolfram Sang References: <1473108014-30787-1-git-send-email-david@lechnology.com> <1473108014-30787-4-git-send-email-david@lechnology.com> <20160916210315.GB2216@katana> Cc: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org From: David Lechner Message-ID: <884a0040-7965-5384-5fe1-8204ba73ccb1@lechnology.com> Date: Fri, 16 Sep 2016 16:09:02 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 MIME-Version: 1.0 In-Reply-To: <20160916210315.GB2216@katana> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - vern.gendns.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - lechnology.com X-Get-Message-Sender-Via: vern.gendns.com: authenticated_id: davidmain+lechnology.com/only user confirmed/virtual account not confirmed X-Authenticated-Sender: vern.gendns.com: davidmain@lechnology.com X-Source: X-Source-Args: X-Source-Dir: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/16/2016 04:03 PM, Wolfram Sang wrote: > >> The intended use of these functions is for LEGO MINDSTORMS sensors. These >> are hot-plugable I2C devices. When a sensor is connected, i2c_adapter_probe() >> is called to automatically configure the sensor. When the sensor is >> disconnected, i2c_adapter_remove_probed() is called to remove the >> automatically configured device. > > How do you detect the hot-plug events? > There are "port" drivers that do this. An I2C adapter is assigned to each port via device-tree or platform data struct. Port driver code if you are interested: - https://github.com/ev3dev/lego-linux-drivers/blob/master/ev3/legoev3_ports_in.c - https://github.com/ev3dev/lego-linux-drivers/blob/master/evb/evb_ports_in.c In particular, here is where we call the new i2c_adapter_probe() function: https://github.com/ev3dev/lego-linux-drivers/blob/master/evb/evb_ports_in.c#L543