Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934572AbbLRBIn (ORCPT ); Thu, 17 Dec 2015 20:08:43 -0500 Received: from mail-ig0-f193.google.com ([209.85.213.193]:33338 "EHLO mail-ig0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932478AbbLRBIl (ORCPT ); Thu, 17 Dec 2015 20:08:41 -0500 MIME-Version: 1.0 In-Reply-To: <1450400312.5427.15.camel@intel.com> References: <1450399868.5427.11.camel@linux.intel.com> <1450400312.5427.15.camel@intel.com> Date: Thu, 17 Dec 2015 17:08:40 -0800 Message-ID: Subject: Re: iio/hid-sensor-accel-3d: no output from /dev/iio:device*? From: Nish Aravamudan To: "Pandruvada, Srinivas" Cc: "jikos@kernel.org" , "lars@metafoo.de" , "linux-kernel@vger.kernel.org" , "knaack.h@gmx.de" , "jic23@kernel.org" , "cmo@melexis.com" , "linux-iio@vger.kernel.org" , "pmeerw@pmeerw.net" , "linux-input@vger.kernel.org" , "Shevchenko, Andriy" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2232 Lines: 58 On Thu, Dec 17, 2015 at 5:00 PM, Pandruvada, Srinivas wrote: > Hi Andy, > > As per Nish these patches are impacting sensors on Yoga. > https://lkml.org/lkml/2015/11/30/441 To be clear, without that series, the touchpad and touchscreen on the Yoga 900 don't work at all. So they are necessary for functioning. I don't know (I will test it now), if removing the series makes the IIO sensors work properly in /dev/. -Nish > On Thu, 2015-12-17 at 16:51 -0800, Srinivas Pandruvada wrote: >> On Thu, 2015-12-17 at 15:38 -0800, Nish Aravamudan wrote: >> > [Starting a new thread from https://lkml.org/lkml/2015/12/15/663, >> > as >> > now my laptop is displaying values in the sysfs *raw* files.] >> > >> > So I'm trying to understand exactly how the hid-sensor-accel-3d >> > driver works. >> > >> > If I turn up debugging, when I `cat >> > /sys/bus/iio/devices/device*/*raw*`, I see "iio iio:device3: >> > accel_3d_proc_event" and I think that means that >> > hid_sensor_push_data() is getting called. >> > >> > But read()'s on /dev/iio:device3 never produces anything, which is >> > what iio-sensor-proxy uses to translate events to dbus. >> > >> > Is it expected that the dev-node is "silent"? Just trying to >> > understand if an extension to the driver to support a chardev based >> > output is appropriate, or if iio-sensor-proxy needs to be changed >> > to >> > handle this device. >> >> You are saying there is some regression. This used to work and now it >> doesn't work. Is raw values are displayed correctly, when you do >> "cat"? >> If cat of raw values is working then power on of sensors is working. >> >> Turn on HID debug prints. If it is regression we can do git bisect. >> Any ACPI or PM changes can break this. Usually there will be GPIOs >> which will be involved in power on, where ACPI comes into play. This >> will be done by i2c-hid. There are some prints in i2c-hid which can >> be >> enabled also. >> >> Thanks, >> Srinivas >> >> > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/