From nobody Wed Feb 11 05:17:47 2026 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3730540849; Wed, 27 Mar 2024 08:27:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711528078; cv=none; b=GkB3zsizk5nHn7dDEKPiDzJ20usZeOq/7l3uNRum5aiDYkJ8Lus+H8y2Uk9HnOkmAsabs5wOgPP+opagnvvjlGAyTb1OBaJJWNoYlKQuC20hHc0attS5ujIyE2G94pcIMC5iTakfGOB7XaOqvJDXkoEqKTveKiSRH6Elr2hvF5E= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711528078; c=relaxed/simple; bh=5QjDv615sDLa85SKipb24CSNpT+d7isOOQugIxBtiGw=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=tydXcRJzn+HY6erZXIIBh5Ae/RvTlZpHrudItyfWOaBQj6i8alkABAtJGllcn6hZEfR9N5vAF1MVrnk+GUJG3N856Kb3i3d1Q+rqRGYRw/3RQm/izCK9AKe2bhdc0wKkTnTOEFWYURj9PDjJ94Q/HLaD9aXlf/NCToyApq1EiL0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: df9b8a0aec1311ee8f9e3516dd0c116b-20240327 X-CID-O-RULE: Release_Ham X-CID-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.37,REQID:1e339bde-6f28-483d-8c64-c37fa25c6e80,IP:10, URL:0,TC:0,Content:-5,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTI ON:release,TS:0 X-CID-INFO: VERSION:1.1.37,REQID:1e339bde-6f28-483d-8c64-c37fa25c6e80,IP:10,UR L:0,TC:0,Content:-5,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTION :release,TS:0 X-CID-META: VersionHash:6f543d0,CLOUDID:0a00e383db42524f597dcf9eb00044c3,BulkI D:2403271627402FOJIH2F,BulkQuantity:0,Recheck:0,SF:66|38|24|72|19|44|102,T C:nil,Content:0,EDM:-3,IP:-2,URL:0,File:nil,RT:nil,Bulk:nil,QS:nil,BEC:nil ,COL:0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0 X-CID-BVR: 0 X-CID-BAS: 0,_,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR,TF_CID_SPAM_FSD,TF_CID_SPAM_FSI X-UUID: df9b8a0aec1311ee8f9e3516dd0c116b-20240327 X-User: aichao@kylinos.cn Received: from localhost.localdomain [(112.64.161.44)] by mailgw (envelope-from ) (Generic MTA) with ESMTP id 806259638; Wed, 27 Mar 2024 16:27:39 +0800 From: Ai Chao To: hdegoede@redhat.com, ilpo.jarvinen@linux.intel.com, linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org Cc: Ai Chao Subject: [PATCH v12] platform/x86: add lenovo WMI camera button driver Date: Wed, 27 Mar 2024 16:27:37 +0800 Message-Id: <20240327082737.336992-1-aichao@kylinos.cn> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add lenovo WMI camera button driver to support camera button. The Camera button is a GPIO device. This driver receives ACPI notifyi when the camera button is switched on/off. This driver is used in Lenovo A70, it is a Computer integrated machine. Signed-off-by: Ai Chao --- v12: Remove useless parentheses and unneeded blank line. v11: Remove input_unregister_device. v10: Add lenovo_wmi_remove and mutex_destroy. v9: Add mutex for wmi notify. v8: Dev_deb convert to dev_err. v7: Add dev_dbg and remove unused dev in struct. v6: Modify SW_CAMERA_LENS_COVER to KEY_CAMERA_ACCESS_ENABLE/KEY_CAMERA_ACCE= SS_DISABLE. v5: Remove camera button groups, modify KEY_CAMERA to SW_CAMERA_LENS_COVER. v4: Remove lenovo_wmi_input_setup, move camera_mode into struct lenovo_wmi_= priv. v3: Remove lenovo_wmi_remove function. v2: Adjust GPL v2 to GPL, adjust sprintf to sysfs_emit. drivers/platform/x86/Kconfig | 12 +++ drivers/platform/x86/Makefile | 1 + drivers/platform/x86/lenovo-wmi-camera.c | 127 +++++++++++++++++++++++ 3 files changed, 140 insertions(+) create mode 100644 drivers/platform/x86/lenovo-wmi-camera.c diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 7e9251fc3341..b8c806506423 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -996,6 +996,18 @@ config INSPUR_PLATFORM_PROFILE To compile this driver as a module, choose M here: the module will be called inspur-platform-profile. =20 +config LENOVO_WMI_CAMERA + tristate "Lenovo WMI Camera Button driver" + depends on ACPI_WMI + depends on INPUT + help + This driver provides support for Lenovo camera button. The Camera + button is a GPIO device. This driver receives ACPI notify when the + camera button is switched on/off. + + To compile this driver as a module, choose M here: the module + will be called lenovo-wmi-camera. + source "drivers/platform/x86/x86-android-tablets/Kconfig" =20 config FW_ATTR_CLASS diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile index 1de432e8861e..217e94d7c877 100644 --- a/drivers/platform/x86/Makefile +++ b/drivers/platform/x86/Makefile @@ -66,6 +66,7 @@ obj-$(CONFIG_SENSORS_HDAPS) +=3D hdaps.o obj-$(CONFIG_THINKPAD_ACPI) +=3D thinkpad_acpi.o obj-$(CONFIG_THINKPAD_LMI) +=3D think-lmi.o obj-$(CONFIG_YOGABOOK) +=3D lenovo-yogabook.o +obj-$(CONFIG_LENOVO_WMI_CAMERA) +=3D lenovo-wmi-camera.o =20 # Intel obj-y +=3D intel/ diff --git a/drivers/platform/x86/lenovo-wmi-camera.c b/drivers/platform/x8= 6/lenovo-wmi-camera.c new file mode 100644 index 000000000000..0c0bedaf7407 --- /dev/null +++ b/drivers/platform/x86/lenovo-wmi-camera.c @@ -0,0 +1,127 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Lenovo WMI Camera Button Driver + * + * Author: Ai Chao + * Copyright (C) 2024 KylinSoft Corporation. + */ + +#include +#include +#include +#include +#include +#include +#include + +#define WMI_LENOVO_CAMERABUTTON_EVENT_GUID "50C76F1F-D8E4-D895-0A3D-62F4EA= 400013" + +struct lenovo_wmi_priv { + struct input_dev *idev; + struct mutex notify_lock; /* lenovo WMI camera button notify lock */ +}; + +enum { + SW_CAMERA_OFF =3D 0, + SW_CAMERA_ON =3D 1, +}; + +static void lenovo_wmi_notify(struct wmi_device *wdev, union acpi_object *= obj) +{ + struct lenovo_wmi_priv *priv =3D dev_get_drvdata(&wdev->dev); + unsigned int keycode; + u8 camera_mode; + + if (obj->type !=3D ACPI_TYPE_BUFFER) { + dev_err(&wdev->dev, "Bad response type %u\n", obj->type); + return; + } + + if (obj->buffer.length !=3D 1) { + dev_err(&wdev->dev, "Invalid buffer length %u\n", obj->buffer.length); + return; + } + + /* + * obj->buffer.pointer[0] is camera mode: + * 0 camera close + * 1 camera open + */ + camera_mode =3D obj->buffer.pointer[0]; + if (camera_mode > SW_CAMERA_ON) { + dev_err(&wdev->dev, "Unknown camera mode %u\n", camera_mode); + return; + } + + mutex_lock(&priv->notify_lock); + + keycode =3D camera_mode =3D=3D SW_CAMERA_ON ? + KEY_CAMERA_ACCESS_ENABLE : KEY_CAMERA_ACCESS_DISABLE; + input_report_key(priv->idev, keycode, 1); + input_sync(priv->idev); + input_report_key(priv->idev, keycode, 0); + input_sync(priv->idev); + + mutex_unlock(&priv->notify_lock); +} + +static int lenovo_wmi_probe(struct wmi_device *wdev, const void *context) +{ + struct lenovo_wmi_priv *priv; + int ret; + + priv =3D devm_kzalloc(&wdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + dev_set_drvdata(&wdev->dev, priv); + + priv->idev =3D devm_input_allocate_device(&wdev->dev); + if (!priv->idev) + return -ENOMEM; + + priv->idev->name =3D "Lenovo WMI Camera Button"; + priv->idev->phys =3D "wmi/input0"; + priv->idev->id.bustype =3D BUS_HOST; + priv->idev->dev.parent =3D &wdev->dev; + input_set_capability(priv->idev, EV_KEY, KEY_CAMERA_ACCESS_ENABLE); + input_set_capability(priv->idev, EV_KEY, KEY_CAMERA_ACCESS_DISABLE); + + ret =3D input_register_device(priv->idev); + if (ret) + return ret; + + mutex_init(&priv->notify_lock); + + return 0; +} + +static void lenovo_wmi_remove(struct wmi_device *wdev) +{ + struct lenovo_wmi_priv *priv =3D dev_get_drvdata(&wdev->dev); + + mutex_destroy(&priv->notify_lock); +} + +static const struct wmi_device_id lenovo_wmi_id_table[] =3D { + { .guid_string =3D WMI_LENOVO_CAMERABUTTON_EVENT_GUID }, + { } +}; +MODULE_DEVICE_TABLE(wmi, lenovo_wmi_id_table); + +static struct wmi_driver lenovo_wmi_driver =3D { + .driver =3D { + .name =3D "lenovo-wmi-camera", + .probe_type =3D PROBE_PREFER_ASYNCHRONOUS, + }, + .id_table =3D lenovo_wmi_id_table, + .no_singleton =3D true, + .probe =3D lenovo_wmi_probe, + .notify =3D lenovo_wmi_notify, + .remove =3D lenovo_wmi_remove, +}; +module_wmi_driver(lenovo_wmi_driver); + +MODULE_AUTHOR("Ai Chao "); +MODULE_DESCRIPTION("Lenovo WMI Camera Button Driver"); +MODULE_LICENSE("GPL"); --=20 2.25.1