diff mbox series

[v12] platform/x86: add lenovo WMI camera button driver

Message ID 20240327082737.336992-1-aichao@kylinos.cn (mailing list archive)
State Accepted, archived
Headers show
Series [v12] platform/x86: add lenovo WMI camera button driver | expand

Commit Message

Ai Chao March 27, 2024, 8:27 a.m. UTC 
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 <aichao@kylinos.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

Comments

Hans de Goede March 27, 2024, 8 p.m. UTC | #1 
Hi,

On 3/27/24 9:27 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
> 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>

Thank you for the new version. I've replaced your v11 in
my review-hans branch with this version now, keeping
Armin Wolf's Reviewed-by from v11.

Regards,

Hans



> ---
> 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
> +	  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@kylinos.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@kylinos.cn>");
> +MODULE_DESCRIPTION("Lenovo WMI Camera Button Driver");
> +MODULE_LICENSE("GPL");
Kuppuswamy Sathyanarayanan March 27, 2024, 11:35 p.m. UTC | #2 
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@kylinos.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

> +	  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@kylinos.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@kylinos.cn>");
> +MODULE_DESCRIPTION("Lenovo WMI Camera Button Driver");
> +MODULE_LICENSE("GPL");
Hans de Goede April 8, 2024, 1:23 p.m. UTC | #3 
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@kylinos.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@kylinos.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@kylinos.cn>");
>> +MODULE_DESCRIPTION("Lenovo WMI Camera Button Driver");
>> +MODULE_LICENSE("GPL");
>
diff mbox series

Patch

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
+	  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@kylinos.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@kylinos.cn>");
+MODULE_DESCRIPTION("Lenovo WMI Camera Button Driver");
+MODULE_LICENSE("GPL");