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Message-ID: <98358aa6-332b-47ab-bdec-8a377fff992b@gmx.de>
Date: Thu, 21 Mar 2024 22:46:02 +0100
From: Armin Wolf <W_Armin@....de>
To: Ai Chao <aichao@...inos.cn>, hdegoede@...hat.com,
ilpo.jarvinen@...ux.intel.com, linux-kernel@...r.kernel.org,
platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v10] platform/x86: add lenovo wmi camera button driver
Am 20.03.24 um 09:17 schrieb Ai Chao:
> Add lenovo generic wmi 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 <aichao@...inos.cn>
> ---
> 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_ACCESS_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 | 123 +++++++++++++++++++++++
> 3 files changed, 136 insertions(+)
> create mode 100644 drivers/platform/x86/lenovo-wmi-camera.c
>
> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> index bdd302274b9a..9506a455b547 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -1001,6 +1001,18 @@ config INSPUR_PLATFORM_PROFILE
> To compile this driver as a module, choose M here: the module
> will be called inspur-platform-profile.
>
> +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"
>
> 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-$(CONFIG_SENSORS_HDAPS) += hdaps.o
> obj-$(CONFIG_THINKPAD_ACPI) += thinkpad_acpi.o
> obj-$(CONFIG_THINKPAD_LMI) += think-lmi.o
> obj-$(CONFIG_YOGABOOK) += lenovo-yogabook.o
> +obj-$(CONFIG_LENOVO_WMI_CAMERA) += lenovo-wmi-camera.o
>
> # Intel
> obj-y += intel/
> diff --git a/drivers/platform/x86/lenovo-wmi-camera.c b/drivers/platform/x86/lenovo-wmi-camera.c
> new file mode 100644
> index 000000000000..4b1bd81cc581
> --- /dev/null
> +++ b/drivers/platform/x86/lenovo-wmi-camera.c
> @@ -0,0 +1,123 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Lenovo WMI Camera Button Driver
> + *
> + * Author: Ai Chao <aichao@...inos.cn>
> + * Copyright (C) 2024 KylinSoft Corporation.
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/device.h>
> +#include <linux/input.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/wmi.h>
> +
> +#define WMI_LENOVO_CAMERABUTTON_EVENT_GUID "50C76F1F-D8E4-D895-0A3D-62F4EA400013"
> +
> +struct lenovo_wmi_priv {
> + struct input_dev *idev;
> + struct mutex notify_lock; /* lenovo wmi camera button notify lock */
> +};
> +
> +enum {
> + SW_CAMERA_OFF = 0,
> + SW_CAMERA_ON = 1,
> +};
> +
> +static void lenovo_wmi_notify(struct wmi_device *wdev, union acpi_object *obj)
> +{
> + struct lenovo_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
> + unsigned int keycode;
> + u8 camera_mode;
> +
> + if (obj->type != ACPI_TYPE_BUFFER) {
> + dev_err(&wdev->dev, "Bad response type %u\n", obj->type);
> + return;
> + }
> +
> + if (obj->buffer.length != 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 = 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 = (camera_mode == 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;
> +
> + priv = devm_kzalloc(&wdev->dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + dev_set_drvdata(&wdev->dev, priv);
> +
> + mutex_init(&priv->notify_lock);
> + priv->idev = devm_input_allocate_device(&wdev->dev);
> + if (!priv->idev) {
> + mutex_destroy(&priv->notify_lock);
> + return -ENOMEM;
> + }
> +
> + priv->idev->name = "Lenovo WMI Camera Button";
> + priv->idev->phys = "wmi/input0";
> + priv->idev->id.bustype = BUS_HOST;
> + priv->idev->dev.parent = &wdev->dev;
> + input_set_capability(priv->idev, EV_KEY, KEY_CAMERA_ACCESS_ENABLE);
> + input_set_capability(priv->idev, EV_KEY, KEY_CAMERA_ACCESS_DISABLE);
> +
> + return input_register_device(priv->idev);
> +}
> +
> +static void lenovo_wmi_remove(struct wmi_device *wdev)
> +{
> + struct lenovo_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
> +
> + mutex_destroy(&priv->notify_lock);
> + input_unregister_device(priv->idev);
Hi,
input_unregister_device() is not needed because of devm_input_allocate_device(),
and still mutex_destroy() is not called when input_device_register() fails.
Maybe you can just call mutex_init() after calling input_device_register() (after doing
the necessary error handling), like this:
ret = input_register_device(priv->idev);
if (ret < 0)
return ret;
mutex_init(&priv->notify_lock);
return 0;
This should work because the notify handler (which is the only user of this mutex) can only
run after lenovo_wmi_probe() returns.
In lenovo_wmi_remove(), you then just need to call mutex_destroy().
Thanks,
Armin Wolf
> +}
> +
> +static const struct wmi_device_id lenovo_wmi_id_table[] = {
> + { .guid_string = WMI_LENOVO_CAMERABUTTON_EVENT_GUID },
> + { }
> +};
> +
> +static struct wmi_driver lenovo_wmi_driver = {
> + .driver = {
> + .name = "lenovo-wmi-camera",
> + .probe_type = PROBE_PREFER_ASYNCHRONOUS,
> + },
> + .id_table = lenovo_wmi_id_table,
> + .no_singleton = true,
> + .probe = lenovo_wmi_probe,
> + .notify = lenovo_wmi_notify,
> + .remove = lenovo_wmi_remove,
> +};
> +
> +module_wmi_driver(lenovo_wmi_driver);
> +
> +MODULE_DEVICE_TABLE(wmi, lenovo_wmi_id_table);
> +MODULE_AUTHOR("Ai Chao <aichao@...inos.cn>");
> +MODULE_DESCRIPTION("Lenovo WMI Camera Button Driver");
> +MODULE_LICENSE("GPL");
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