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Message-ID: <be0f0a67-d397-470c-ac29-8707b5e6a1a8@redhat.com>
Date: Mon, 8 Apr 2024 15:23:39 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>,
Ai Chao <aichao@...inos.cn>, ilpo.jarvinen@...ux.intel.com,
linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v12] platform/x86: add lenovo WMI camera button driver
Hi,
On 3/28/24 12:35 AM, Kuppuswamy Sathyanarayanan wrote:
>
> On 3/27/24 1:27 AM, Ai Chao wrote:
>> Add lenovo WMI camera button driver to support camera button.
>> The Camera button is a GPIO device. This driver receives ACPI notifyi
>
> /s/notifyi/notification
>
>> 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>
>> ---
>> 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_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 | 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.
>>
>> +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
>
> /s/notify/notification
Thank you. Since I already merged v12 I've squashed a fix for this
into the patch/commit in my review-hans branch.
Regards,
Hans
>
>> + 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..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 <aichao@...inos.cn>
>> + * Copyright (C) 2024 KylinSoft Corporation.
>> + */
>> +
>> +#include <linux/acpi.h>
>> +#include <linux/device.h>
>> +#include <linux/input.h>
>> +#include <linux/types.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;
>> + int ret;
>> +
>> + priv = devm_kzalloc(&wdev->dev, sizeof(*priv), GFP_KERNEL);
>> + if (!priv)
>> + return -ENOMEM;
>> +
>> + dev_set_drvdata(&wdev->dev, priv);
>> +
>> + priv->idev = devm_input_allocate_device(&wdev->dev);
>> + if (!priv->idev)
>> + 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);
>> +
>> + ret = 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 = dev_get_drvdata(&wdev->dev);
>> +
>> + mutex_destroy(&priv->notify_lock);
>> +}
>> +
>> +static const struct wmi_device_id lenovo_wmi_id_table[] = {
>> + { .guid_string = WMI_LENOVO_CAMERABUTTON_EVENT_GUID },
>> + { }
>> +};
>> +MODULE_DEVICE_TABLE(wmi, lenovo_wmi_id_table);
>> +
>> +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_AUTHOR("Ai Chao <aichao@...inos.cn>");
>> +MODULE_DESCRIPTION("Lenovo WMI Camera Button Driver");
>> +MODULE_LICENSE("GPL");
>
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