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Add lenovo WMI camera button driver to support camera button. The Camera button is a GPIO device. This driver receives ACPI notifications 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 <aichao@kylinos.cn> Link: https://lore.kernel.org/r/20240327082737.336992-1-aichao@kylinos.cn Reviewed-by: Armin Wolf <W_Armin@gmx.de> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
128 lines
3 KiB
C
128 lines
3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Lenovo WMI Camera Button Driver
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*
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* Author: Ai Chao <aichao@kylinos.cn>
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* Copyright (C) 2024 KylinSoft Corporation.
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*/
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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/input.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/wmi.h>
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#define WMI_LENOVO_CAMERABUTTON_EVENT_GUID "50C76F1F-D8E4-D895-0A3D-62F4EA400013"
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struct lenovo_wmi_priv {
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struct input_dev *idev;
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struct mutex notify_lock; /* lenovo WMI camera button notify lock */
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};
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enum {
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SW_CAMERA_OFF = 0,
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SW_CAMERA_ON = 1,
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};
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static void lenovo_wmi_notify(struct wmi_device *wdev, union acpi_object *obj)
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{
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struct lenovo_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
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unsigned int keycode;
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u8 camera_mode;
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if (obj->type != ACPI_TYPE_BUFFER) {
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dev_err(&wdev->dev, "Bad response type %u\n", obj->type);
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return;
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}
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if (obj->buffer.length != 1) {
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dev_err(&wdev->dev, "Invalid buffer length %u\n", obj->buffer.length);
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return;
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}
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/*
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* obj->buffer.pointer[0] is camera mode:
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* 0 camera close
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* 1 camera open
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*/
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camera_mode = obj->buffer.pointer[0];
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if (camera_mode > SW_CAMERA_ON) {
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dev_err(&wdev->dev, "Unknown camera mode %u\n", camera_mode);
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return;
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}
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mutex_lock(&priv->notify_lock);
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keycode = camera_mode == SW_CAMERA_ON ?
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KEY_CAMERA_ACCESS_ENABLE : KEY_CAMERA_ACCESS_DISABLE;
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input_report_key(priv->idev, keycode, 1);
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input_sync(priv->idev);
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input_report_key(priv->idev, keycode, 0);
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input_sync(priv->idev);
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mutex_unlock(&priv->notify_lock);
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}
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static int lenovo_wmi_probe(struct wmi_device *wdev, const void *context)
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{
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struct lenovo_wmi_priv *priv;
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int ret;
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priv = devm_kzalloc(&wdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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dev_set_drvdata(&wdev->dev, priv);
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priv->idev = devm_input_allocate_device(&wdev->dev);
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if (!priv->idev)
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return -ENOMEM;
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priv->idev->name = "Lenovo WMI Camera Button";
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priv->idev->phys = "wmi/input0";
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priv->idev->id.bustype = BUS_HOST;
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priv->idev->dev.parent = &wdev->dev;
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input_set_capability(priv->idev, EV_KEY, KEY_CAMERA_ACCESS_ENABLE);
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input_set_capability(priv->idev, EV_KEY, KEY_CAMERA_ACCESS_DISABLE);
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ret = input_register_device(priv->idev);
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if (ret)
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return ret;
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mutex_init(&priv->notify_lock);
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return 0;
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}
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static void lenovo_wmi_remove(struct wmi_device *wdev)
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{
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struct lenovo_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
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mutex_destroy(&priv->notify_lock);
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}
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static const struct wmi_device_id lenovo_wmi_id_table[] = {
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{ .guid_string = WMI_LENOVO_CAMERABUTTON_EVENT_GUID },
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{ }
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};
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MODULE_DEVICE_TABLE(wmi, lenovo_wmi_id_table);
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static struct wmi_driver lenovo_wmi_driver = {
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.driver = {
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.name = "lenovo-wmi-camera",
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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},
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.id_table = lenovo_wmi_id_table,
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.no_singleton = true,
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.probe = lenovo_wmi_probe,
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.notify = lenovo_wmi_notify,
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.remove = lenovo_wmi_remove,
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};
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module_wmi_driver(lenovo_wmi_driver);
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MODULE_AUTHOR("Ai Chao <aichao@kylinos.cn>");
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MODULE_DESCRIPTION("Lenovo WMI Camera Button Driver");
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MODULE_LICENSE("GPL");
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