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 <[email protected]>
---
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 <[email protected]>
+ * 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 <[email protected]>");
+MODULE_DESCRIPTION("Lenovo WMI Camera Button Driver");
+MODULE_LICENSE("GPL");
--
2.25.1
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 <[email protected]>
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 <[email protected]>
> + * 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 <[email protected]>");
> +MODULE_DESCRIPTION("Lenovo WMI Camera Button Driver");
> +MODULE_LICENSE("GPL");
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 <[email protected]>
> ---
> 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 <[email protected]>
> + * 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 <[email protected]>");
> +MODULE_DESCRIPTION("Lenovo WMI Camera Button Driver");
> +MODULE_LICENSE("GPL");
--
Sathyanarayanan Kuppuswamy
Linux Kernel Developer
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 <[email protected]>
>> ---
>> 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 <[email protected]>
>> + * 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 <[email protected]>");
>> +MODULE_DESCRIPTION("Lenovo WMI Camera Button Driver");
>> +MODULE_LICENSE("GPL");
>