From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mika Westerberg Subject: Re: Hidden dependency of i2c-hid on GPIOLIB Date: Tue, 14 Apr 2015 12:59:24 +0300 Message-ID: <20150414095924.GB1677@lahna.fi.intel.com> References: <2014782.heKI7XOhuD@xps13> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mga03.intel.com ([134.134.136.65]:52721 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752815AbbDNJ72 (ORCPT ); Tue, 14 Apr 2015 05:59:28 -0400 Content-Disposition: inline In-Reply-To: <2014782.heKI7XOhuD@xps13> Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: Gabriele Mazzotta Cc: Jiri Kosina , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Benjamin Tissoires On Tue, Apr 14, 2015 at 12:55:20AM +0200, Gabriele Mazzotta wrote: > Hi, > > my touchpad stopped working because of a485923efbb8 ("HID: i2c-hid: > Add support for ACPI GPIO interrupts"). It turned out that I need > CONFIG_GPIOLIB. I think this dependency should be made explicit or the > driver should not depend on it. Using GPIOs should be optional. Gpiolib stubs functions out whenever it is not enabled. However, I made a mistake when GPIOs are fed to the driver. If gpiolib is not enabled acpi_dev_add_driver_gpios() returns -ENXIO and prevents your touchpad from working. I think it is alright to ignore the error here. Can you try if below patch helps? diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c index ab4dd952b6ba..b427c11d4cd3 100644 --- a/drivers/hid/i2c-hid/i2c-hid.c +++ b/drivers/hid/i2c-hid/i2c-hid.c @@ -877,7 +877,8 @@ static int i2c_hid_acpi_pdata(struct i2c_client *client, pdata->hid_descriptor_address = obj->integer.value; ACPI_FREE(obj); - return acpi_dev_add_driver_gpios(adev, i2c_hid_acpi_gpios); + acpi_dev_add_driver_gpios(adev, i2c_hid_acpi_gpios); + return 0; } static const struct acpi_device_id i2c_hid_acpi_match[] = {