From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5776AC5519F for ; Sat, 14 Nov 2020 16:01:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1C4E822263 for ; Sat, 14 Nov 2020 16:01:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="Y8Bq+vhr" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727104AbgKNQBY (ORCPT ); Sat, 14 Nov 2020 11:01:24 -0500 Received: from mail.kernel.org ([198.145.29.99]:52394 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726356AbgKNQBY (ORCPT ); Sat, 14 Nov 2020 11:01:24 -0500 Received: from archlinux (cpc149474-cmbg20-2-0-cust94.5-4.cable.virginm.net [82.4.196.95]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7340720665; Sat, 14 Nov 2020 16:01:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1605369683; bh=687uoE8JYHYC2mlf+EgWVlqqQOSoFL8t1b0u2JKOZuY=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=Y8Bq+vhrzJHtC/UfTdthlPKaUPIfMPR1+Qbz016qVaZUQhquuWeVIpcAUXK9Sj/r/ lbftdkp2vXEsNrfyZsGeRoJCPhbQlMga3BucmxI/GVLcuBpTMguU5YwZIymNZ+tKZE cksUkvcmPxfTFaY0izq8zGshSOAxATozpS3Dwyog= Date: Sat, 14 Nov 2020 16:01:18 +0000 From: Jonathan Cameron To: Hans de Goede Cc: Lars-Peter Clausen , Peter Meerwald-Stadler , "russianneuromancer @ ya . ru" , linux-iio@vger.kernel.org Subject: Re: [PATCH bugfix for 5.10 2/2] iio: accel: kxcjk1013: Add support for KIOX010A ACPI DSM for setting tablet-mode Message-ID: <20201114160118.0a373496@archlinux> In-Reply-To: <20201110133835.129080-3-hdegoede@redhat.com> References: <20201110133835.129080-1-hdegoede@redhat.com> <20201110133835.129080-3-hdegoede@redhat.com> X-Mailer: Claws Mail 3.17.7 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org On Tue, 10 Nov 2020 14:38:35 +0100 Hans de Goede wrote: > Some 360 degree hinges (yoga) style 2-in-1 devices use 2 KXCJ91008-s > to allow the OS to determine the angle between the display and the base > of the device, so that the OS can determine if the 2-in-1 is in laptop > or in tablet-mode. > > On Windows both accelerometers are read by a special HingeAngleService > process; and this process calls a DSM (Device Specific Method) on the > ACPI KIOX010A device node for the sensor in the display, to let the > embedded-controller (EC) know about the mode so that it can disable the > kbd and touchpad to avoid spurious input while folded into tablet-mode. > > This notifying of the EC is problematic because sometimes the EC comes up > thinking that device is in tablet-mode and the kbd and touchpad do not > work. This happens for example on Irbis NB111 devices after a suspend / > resume cycle (after a complete battery drain / hard reset without having > booted Windows at least once). Other 2-in-1s which are likely affected > too are e.g. the Teclast F5 and F6 series. > > The kxcjk-1013 driver may seem like a strange place to deal with this, > but since it is *the* driver for the ACPI KIOX010A device, it is also > the driver which has access to the ACPI handle needed by the DSM. > > Add support for calling the DSM and on probe unconditionally tell the > EC that the device is laptop mode, fixing the kbd and touchpad sometimes > not working. > > Reported-and-tested-by: russianneuromancer > Signed-off-by: Hans de Goede Hi Hans, *Mutters darkly about crazy firmware hacks* I'm fine taking this but I assume we want to backport and for that I'm after a fixes tag. Thanks, Jonathan > --- > drivers/iio/accel/kxcjk-1013.c | 36 ++++++++++++++++++++++++++++++++++ > 1 file changed, 36 insertions(+) > > diff --git a/drivers/iio/accel/kxcjk-1013.c b/drivers/iio/accel/kxcjk-1013.c > index abeb0d254046..560a3373ff20 100644 > --- a/drivers/iio/accel/kxcjk-1013.c > +++ b/drivers/iio/accel/kxcjk-1013.c > @@ -129,6 +129,7 @@ enum kx_chipset { > enum kx_acpi_type { > ACPI_GENERIC, > ACPI_SMO8500, > + ACPI_KIOX010A, > }; > > struct kxcjk1013_data { > @@ -275,6 +276,32 @@ static const struct { > {19163, 1, 0}, > {38326, 0, 1} }; > > +#ifdef CONFIG_ACPI > +enum kiox010a_fn_index { > + KIOX010A_SET_LAPTOP_MODE = 1, > + KIOX010A_SET_TABLET_MODE = 2, > +}; > + > +static int kiox010a_dsm(struct device *dev, int fn_index) > +{ > + acpi_handle handle = ACPI_HANDLE(dev); > + guid_t kiox010a_dsm_guid; > + union acpi_object *obj; > + > + if (!handle) > + return -ENODEV; > + > + guid_parse("1f339696-d475-4e26-8cad-2e9f8e6d7a91", &kiox010a_dsm_guid); > + > + obj = acpi_evaluate_dsm(handle, &kiox010a_dsm_guid, 1, fn_index, NULL); > + if (!obj) > + return -EIO; > + > + ACPI_FREE(obj); > + return 0; > +} > +#endif > + > static int kxcjk1013_set_mode(struct kxcjk1013_data *data, > enum kxcjk1013_mode mode) > { > @@ -352,6 +379,13 @@ static int kxcjk1013_chip_init(struct kxcjk1013_data *data) > { > int ret; > > +#ifdef CONFIG_ACPI > + if (data->acpi_type == ACPI_KIOX010A) { > + /* Make sure the kbd and touchpad on 2-in-1s using 2 KXCJ91008-s work */ > + kiox010a_dsm(&data->client->dev, KIOX010A_SET_LAPTOP_MODE); > + } > +#endif > + > ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_WHO_AM_I); > if (ret < 0) { > dev_err(&data->client->dev, "Error reading who_am_i\n"); > @@ -1262,6 +1296,8 @@ static const char *kxcjk1013_match_acpi_device(struct device *dev, > > if (strcmp(id->id, "SMO8500") == 0) > *acpi_type = ACPI_SMO8500; > + else if (strcmp(id->id, "KIOX010A") == 0) > + *acpi_type = ACPI_KIOX010A; > > *chipset = (enum kx_chipset)id->driver_data; >