[PATCH] platform/x86: dell-privacy: Add support for new privacy driver

[Perry Yuan <Perry.Yuan@dell.com>]

From: perry_yuan <perry_yuan@dell.com>

 add support for dell privacy driver for the dell units equipped
 hardware privacy design, which protect users privacy
 of audio and camera from hardware level. once the audio or camera
 privacy mode enabled, any applications will not get any audio or
 video stream.
 when user pressed ctrl+F4 hotkey, audio privacy mode will be enabled
 and camera mute hotkey is ctrl+F9.

Signed-off-by: Perry Yuan  <perry_yuan@dell.com>
Signed-off-by: Limonciello Mario <mario_limonciello@dell.com>
---
 drivers/platform/x86/Kconfig             |  12 ++
 drivers/platform/x86/Makefile            |   4 +-
 drivers/platform/x86/dell-laptop.c       |  41 ++--
 drivers/platform/x86/dell-privacy-acpi.c | 139 ++++++++++++
 drivers/platform/x86/dell-privacy-wmi.c  | 259 +++++++++++++++++++++++
 drivers/platform/x86/dell-privacy-wmi.h  |  23 ++
 drivers/platform/x86/dell-wmi.c          |  90 ++++----
 7 files changed, 513 insertions(+), 55 deletions(-)
 create mode 100644 drivers/platform/x86/dell-privacy-acpi.c
 create mode 100644 drivers/platform/x86/dell-privacy-wmi.c
 create mode 100644 drivers/platform/x86/dell-privacy-wmi.h

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 40219bba6801..0cb6bf5a9565 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -454,6 +454,18 @@ config DELL_WMI_LED
 	  This adds support for the Latitude 2100 and similar
 	  notebooks that have an external LED.
 
+config DELL_PRIVACY
+        tristate "Dell Hardware Privacy Support"
+        depends on ACPI
+        depends on ACPI_WMI
+        depends on INPUT
+        depends on DELL_LAPTOP
+        select DELL_WMI
+        help
+          This driver provides a driver to support messaging related to the
+          privacy button presses on applicable Dell laptops from 2021 and
+          newer.
+
 config AMILO_RFKILL
 	tristate "Fujitsu-Siemens Amilo rfkill support"
 	depends on RFKILL
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 5f823f7eff45..111f7215db2f 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -47,7 +47,9 @@ obj-$(CONFIG_DELL_WMI)			+= dell-wmi.o
 obj-$(CONFIG_DELL_WMI_DESCRIPTOR)	+= dell-wmi-descriptor.o
 obj-$(CONFIG_DELL_WMI_AIO)		+= dell-wmi-aio.o
 obj-$(CONFIG_DELL_WMI_LED)		+= dell-wmi-led.o
-
+obj-$(CONFIG_DELL_PRIVACY)              += dell-privacy.o
+dell-privacy-objs                       := dell-privacy-wmi.o \
+	                                   dell-privacy-acpi.o
 # Fujitsu
 obj-$(CONFIG_AMILO_RFKILL)	+= amilo-rfkill.o
 obj-$(CONFIG_FUJITSU_LAPTOP)	+= fujitsu-laptop.o
diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index 5e9c2296931c..12b91de09356 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -30,6 +30,7 @@
 #include <acpi/video.h>
 #include "dell-rbtn.h"
 #include "dell-smbios.h"
+#include "dell-privacy-wmi.h"
 
 struct quirk_entry {
 	bool touchpad_led;
@@ -90,6 +91,7 @@ static struct rfkill *wifi_rfkill;
 static struct rfkill *bluetooth_rfkill;
 static struct rfkill *wwan_rfkill;
 static bool force_rfkill;
+static bool privacy_valid;
 
 module_param(force_rfkill, bool, 0444);
 MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
@@ -2202,20 +2204,25 @@ static int __init dell_init(void)
 	debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
 			    &dell_debugfs_fops);
 
-	dell_laptop_register_notifier(&dell_laptop_notifier);
-
-	if (dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE) &&
-	    dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE)) {
-		micmute_led_cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE);
-		ret = led_classdev_register(&platform_device->dev, &micmute_led_cdev);
-		if (ret < 0)
-			goto fail_led;
-	}
-
-	if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
-		return 0;
-
-	token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
+    dell_laptop_register_notifier(&dell_laptop_notifier);
+
+    if (dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE) &&
+            dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE)) {
+#if IS_ENABLED(CONFIG_DELL_PRIVACY)
+        privacy_valid = dell_privacy_valid() == -ENODEV;
+#endif
+        if (!privacy_valid) {
+            micmute_led_cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE);
+            ret = led_classdev_register(&platform_device->dev, &micmute_led_cdev);
+            if (ret < 0)
+                goto fail_led;
+        }
+    }
+
+    if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
+        return 0;
+
+    token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
 	if (token) {
 		struct calling_interface_buffer buffer;
 
@@ -2257,7 +2264,8 @@ static int __init dell_init(void)
 fail_get_brightness:
 	backlight_device_unregister(dell_backlight_device);
 fail_backlight:
-	led_classdev_unregister(&micmute_led_cdev);
+    if (!privacy_valid)
+        led_classdev_unregister(&micmute_led_cdev);
 fail_led:
 	dell_cleanup_rfkill();
 fail_rfkill:
@@ -2278,7 +2286,8 @@ static void __exit dell_exit(void)
 		touchpad_led_exit();
 	kbd_led_exit();
 	backlight_device_unregister(dell_backlight_device);
-	led_classdev_unregister(&micmute_led_cdev);
+    if (!privacy_valid)
+        led_classdev_unregister(&micmute_led_cdev);
 	dell_cleanup_rfkill();
 	if (platform_device) {
 		platform_device_unregister(platform_device);
diff --git a/drivers/platform/x86/dell-privacy-acpi.c b/drivers/platform/x86/dell-privacy-acpi.c
new file mode 100644
index 000000000000..516cd99167c3
--- /dev/null
+++ b/drivers/platform/x86/dell-privacy-acpi.c
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Dell privacy notification driver
+ *
+ * Copyright (C) 2021 Dell Inc. All Rights Reserved.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/acpi.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/sysfs.h>
+#include <linux/types.h>
+#include <linux/wmi.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include "dell-privacy-wmi.h"
+
+#define PRIVACY_PlATFORM_NAME  "dell-privacy-acpi"
+#define ACPI_PRIVACY_DEVICE	"\\_SB.PC00.LPCB.ECDV"
+#define ACPI_PRIVACY_EC_ACK	ACPI_PRIVACY_DEVICE ".ECAK"
+
+static struct platform_device *privacy_acpi_pdev;
+
+struct privacy_acpi_priv {
+    struct device *dev;
+    struct acpi_device *acpi_dev;
+    struct input_dev *input_dev;
+    struct platform_device *platform_device;
+};
+
+static int micmute_led_set(struct led_classdev *led_cdev,
+               enum led_brightness brightness)
+{
+    acpi_status status;
+
+    status = acpi_evaluate_object(NULL, ACPI_PRIVACY_EC_ACK, NULL, NULL);
+    if (ACPI_FAILURE(status)) {
+        dev_err(led_cdev->dev, "Error setting privacy audio EC ack value: %d\n",status);
+        return -EIO;
+    }
+    return 0;
+}
+
+static struct led_classdev micmute_led_cdev = {
+    .name = "platform::micmute",
+    .max_brightness = 1,
+    .brightness_set_blocking = micmute_led_set,
+    .default_trigger = "audio-micmute",
+};
+
+static int privacy_acpi_remove(struct platform_device *pdev)
+{
+    dev_set_drvdata(&pdev->dev, NULL);
+    return 0;
+}
+
+static int privacy_acpi_probe(struct platform_device *pdev)
+{
+    struct privacy_acpi_priv *privacy;
+    acpi_handle handle;
+    acpi_status status;
+    int err;
+
+    privacy = kzalloc(sizeof(struct privacy_acpi_priv), GFP_KERNEL);
+    if (!privacy)
+        return -ENOMEM;
+
+    privacy->dev = &pdev->dev;
+    privacy->platform_device = pdev;
+    platform_set_drvdata(pdev, privacy);
+    /* Look for software micmute complete notification device */
+    status = acpi_get_handle(ACPI_ROOT_OBJECT,
+            ACPI_PRIVACY_DEVICE,
+            &handle);
+    if (ACPI_FAILURE(status)) {
+        dev_err(privacy->dev, "Unable to find Dell`s EC device %s: %d\n",
+                ACPI_PRIVACY_DEVICE, status);
+        return -ENXIO;
+    }
+
+    micmute_led_cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE);
+    err = led_classdev_register(&privacy_acpi_pdev->dev, &micmute_led_cdev);
+    if (err < 0)
+        return -EIO;
+
+    return 0;
+}
+
+static const struct acpi_device_id privacy_acpi_device_ids[] = {
+    {"PNP0C09", 0},
+    {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, privacy_acpi_device_ids);
+
+static struct platform_driver privacy_platform_driver = {
+    .driver     = {
+        .name   = PRIVACY_PlATFORM_NAME,
+        .acpi_match_table = ACPI_PTR(privacy_acpi_device_ids),
+    },
+    .probe      = privacy_acpi_probe,
+    .remove     = privacy_acpi_remove,
+};
+
+int privacy_acpi_init(void)
+{
+    int err;
+
+    err = platform_driver_register(&privacy_platform_driver);
+    if (err)
+        return err;
+
+    privacy_acpi_pdev = platform_device_register_simple(
+            PRIVACY_PlATFORM_NAME, -1, NULL, 0);
+    if (IS_ERR(privacy_acpi_pdev)) {
+        err = PTR_ERR(privacy_acpi_pdev);
+        goto err_platform;
+    }
+    return 0;
+
+err_platform:
+    platform_driver_unregister(&privacy_platform_driver);
+    return err;
+}
+
+void privacy_acpi_cleanup(void)
+{
+    platform_driver_unregister(&privacy_platform_driver);
+}
+
+MODULE_AUTHOR("Perry Yuan <perry_yuan@dell.com>");
+MODULE_DESCRIPTION("DELL Privacy ACPI Driver");
+MODULE_LICENSE("GPL");
+
diff --git a/drivers/platform/x86/dell-privacy-wmi.c b/drivers/platform/x86/dell-privacy-wmi.c
new file mode 100644
index 000000000000..6c36b7ec44c6
--- /dev/null
+++ b/drivers/platform/x86/dell-privacy-wmi.c
@@ -0,0 +1,259 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Dell privacy notification driver
+ *
+ * Copyright (C) 2021 Dell Inc. All Rights Reserved.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/acpi.h>
+#include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/wmi.h>
+#include "dell-privacy-wmi.h"
+
+#define DELL_PRIVACY_GUID "6932965F-1671-4CEB-B988-D3AB0A901919"
+#define MICROPHONE_STATUS		    BIT(0)
+#define CAMERA_STATUS		        BIT(1)
+#define PRIVACY_SCREEN_STATUS		BIT(2)
+
+static int privacy_valid = -EPROBE_DEFER;
+static LIST_HEAD(wmi_list);
+static DEFINE_MUTEX(list_mutex);
+
+struct privacy_wmi_data {
+    struct input_dev *input_dev;
+    struct wmi_device *wdev;
+    struct list_head list;
+    u32 features_present;
+    u32 last_status;
+};
+
+/*
+ * Keymap for WMI Privacy events of type 0x0012
+ */
+static const struct key_entry dell_wmi_keymap_type_0012[] = {
+    /* Privacy MIC Mute */
+    { KE_KEY, 0x0001, { KEY_MICMUTE } },
+    /* Privacy Camera Mute */
+    { KE_SW,  0x0002, { SW_CAMERA_LENS_COVER } },
+};
+
+bool dell_privacy_valid(void)
+{
+    bool ret;
+
+    mutex_lock(&list_mutex);
+    ret = wmi_has_guid(DELL_PRIVACY_GUID);
+    if (!ret){
+        return -ENODEV;
+    }
+    ret = privacy_valid;
+    mutex_unlock(&list_mutex);
+
+    return ret;
+}
+EXPORT_SYMBOL_GPL(dell_privacy_valid);
+
+void dell_privacy_process_event(int type, int code, int status)
+{
+    struct privacy_wmi_data *priv;
+    const struct key_entry *key;
+
+    mutex_lock(&list_mutex);
+    priv = list_first_entry_or_null(&wmi_list,
+            struct privacy_wmi_data,
+            list);
+    if (priv == NULL) {
+        pr_err("dell privacy priv is NULL\n");
+        goto error;
+    }
+
+    key = sparse_keymap_entry_from_scancode(priv->input_dev, (type << 16)|code);
+    if (!key) {
+        dev_dbg(&priv->wdev->dev, "Unknown key with type 0x%04x and code 0x%04x pressed\n",
+                type, code);
+        goto error;
+    }
+
+    switch (code) {
+        case DELL_PRIVACY_TYPE_AUDIO: /* Mic mute */
+            priv->last_status = status;
+            sparse_keymap_report_entry(priv->input_dev, key, 1, true);
+            break;
+        case DELL_PRIVACY_TYPE_CAMERA: /* Camera mute */
+            priv->last_status = status;
+            sparse_keymap_report_entry(priv->input_dev, key, 1, true);
+            break;
+        default:
+            dev_dbg(&priv->wdev->dev, "unknown event type %u /%u",
+                    type, code);
+    }
+error:
+    mutex_unlock(&list_mutex);
+    return;
+}
+EXPORT_SYMBOL_GPL(dell_privacy_process_event);
+
+static int get_current_status(struct wmi_device *wdev)
+{
+    struct privacy_wmi_data *priv = dev_get_drvdata(&wdev->dev);
+    union acpi_object *obj_present;
+    union acpi_object *obj_current;
+    int ret = 0;
+
+    if (priv == NULL) {
+        pr_err("dell privacy priv is NULL\n");
+        return -EINVAL;
+    }
+    /* get devices supported */
+    obj_present = wmidev_block_query(wdev, 0);
+    if (obj_present->type != ACPI_TYPE_INTEGER) {
+        ret = -EIO;
+        goto present_free;
+    }
+    priv->features_present = obj_present->integer.value;
+
+    /* get current state */
+    obj_current = wmidev_block_query(wdev, 1);
+    if (obj_current->type != ACPI_TYPE_INTEGER) {
+        ret = -EIO;
+        goto current_free;
+    }
+    priv->last_status = obj_current->integer.value;
+current_free:
+    kfree(obj_current);
+present_free:
+    kfree(obj_present);
+    return ret;
+}
+
+static int dell_privacy_wmi_probe(struct wmi_device *wdev, const void *context)
+{
+    struct privacy_wmi_data *priv;
+    struct key_entry *keymap;
+    int ret, i, pos = 0;
+
+    priv = devm_kzalloc(&wdev->dev, sizeof(struct privacy_wmi_data),
+            GFP_KERNEL);
+    if (!priv)
+        return -ENOMEM;
+
+    /* create evdev passing interface */
+    priv->input_dev = devm_input_allocate_device(&wdev->dev);
+    if (!priv->input_dev)
+        return -ENOMEM;
+
+    __set_bit(EV_KEY, priv->input_dev->evbit);
+    __set_bit(KEY_MICMUTE, priv->input_dev->keybit);
+    __set_bit(EV_MSC, priv->input_dev->evbit);
+    __set_bit(MSC_SCAN, priv->input_dev->mscbit);
+    keymap = kcalloc(
+            ARRAY_SIZE(dell_wmi_keymap_type_0012) +
+            1,
+            sizeof(struct key_entry), GFP_KERNEL);
+    if (!keymap) {
+        ret = -ENOMEM;
+        goto err_free_dev;
+    }
+    for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0012); i++) {
+        keymap[pos] = dell_wmi_keymap_type_0012[i];
+        keymap[pos].code |= (0x0012 << 16);
+        pos++;
+    }
+    ret = sparse_keymap_setup(priv->input_dev, keymap, NULL);
+    if (ret)
+        return ret;
+
+    priv->input_dev->dev.parent = &wdev->dev;
+    priv->input_dev->name = "Dell Privacy Driver";
+    priv->input_dev->id.bustype = BUS_HOST;
+
+    if (input_register_device(priv->input_dev)) {
+        pr_debug("input_register_device failed to register! \n");
+        return -ENODEV;
+    }
+
+    priv->wdev = wdev;
+    dev_set_drvdata(&wdev->dev, priv);
+    mutex_lock(&list_mutex);
+    list_add_tail(&priv->list, &wmi_list);
+    privacy_valid = true;
+    if (get_current_status(wdev)) {
+        goto err_free_dev;
+    }
+    mutex_unlock(&list_mutex);
+    kfree(keymap);
+    return 0;
+
+err_free_dev:
+    input_free_device(priv->input_dev);
+    kfree(keymap);
+    return ret;
+}
+
+static int dell_privacy_wmi_remove(struct wmi_device *wdev)
+{
+    struct privacy_wmi_data *priv = dev_get_drvdata(&wdev->dev);
+
+    mutex_lock(&list_mutex);
+    list_del(&priv->list);
+    privacy_valid = -ENODEV;
+    mutex_unlock(&list_mutex);
+    return 0;
+}
+
+static const struct wmi_device_id dell_wmi_privacy_wmi_id_table[] = {
+    { .guid_string = DELL_PRIVACY_GUID },
+    { },
+};
+
+static struct wmi_driver dell_privacy_wmi_driver = {
+    .driver = {
+        .name = "dell-privacy",
+    },
+    .probe = dell_privacy_wmi_probe,
+    .remove = dell_privacy_wmi_remove,
+    .id_table = dell_wmi_privacy_wmi_id_table,
+};
+
+static int __init init_dell_privacy(void)
+{
+    int ret, wmi, acpi;
+
+    wmi = wmi_driver_register(&dell_privacy_wmi_driver);
+    if (wmi) {
+        pr_debug("Failed to initialize privacy wmi driver: %d\n", wmi);
+        return wmi;
+    }
+
+    acpi = privacy_acpi_init();
+    if (acpi) {
+        pr_debug("failed to initialize privacy wmi acpi driver: %d\n", acpi);
+        return acpi;
+    }
+
+    return 0;
+}
+
+void exit_dell_privacy_wmi(void)
+{
+    wmi_driver_unregister(&dell_privacy_wmi_driver);
+}
+
+static void __exit exit_dell_privacy(void)
+{
+    privacy_acpi_cleanup();
+    exit_dell_privacy_wmi();
+}
+
+module_init(init_dell_privacy);
+module_exit(exit_dell_privacy);
+
+MODULE_DEVICE_TABLE(wmi, dell_wmi_privacy_wmi_id_table);
+MODULE_AUTHOR("Perry Yuan <perry_yuan@dell.com>");
+MODULE_DESCRIPTION("Dell Privacy WMI Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/platform/x86/dell-privacy-wmi.h b/drivers/platform/x86/dell-privacy-wmi.h
new file mode 100644
index 000000000000..94af81d76e44
--- /dev/null
+++ b/drivers/platform/x86/dell-privacy-wmi.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Dell privacy notification driver
+ *
+ * Copyright (C) 2021 Dell Inc. All Rights Reserved.
+ */
+
+#ifndef _DELL_PRIVACY_WMI_H_
+#define _DELL_PRIVACY_WMI_H_
+#include <linux/wmi.h>
+
+bool dell_privacy_valid(void);
+void dell_privacy_process_event(int type, int code, int status);
+int  privacy_acpi_init(void);
+void privacy_acpi_cleanup(void);
+
+/* DELL Privacy Type */
+enum {
+	DELL_PRIVACY_TYPE_UNKNOWN = 0x0,
+	DELL_PRIVACY_TYPE_AUDIO,
+	DELL_PRIVACY_TYPE_CAMERA,
+};
+#endif
diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c
index bbdb3e860892..44bb74e4df86 100644
--- a/drivers/platform/x86/dell-wmi.c
+++ b/drivers/platform/x86/dell-wmi.c
@@ -27,6 +27,7 @@
 #include <acpi/video.h>
 #include "dell-smbios.h"
 #include "dell-wmi-descriptor.h"
+#include "dell-privacy-wmi.h"
 
 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
 MODULE_AUTHOR("Pali Rohár <pali@kernel.org>");
@@ -410,44 +411,57 @@ static void dell_wmi_notify(struct wmi_device *wdev,
 		if (buffer_end > buffer_entry + buffer_entry[0] + 1)
 			buffer_end = buffer_entry + buffer_entry[0] + 1;
 
-	while (buffer_entry < buffer_end) {
-
-		len = buffer_entry[0];
-		if (len == 0)
-			break;
-
-		len++;
-
-		if (buffer_entry + len > buffer_end) {
-			pr_warn("Invalid length of WMI event\n");
-			break;
-		}
-
-		pr_debug("Process buffer (%*ph)\n", len*2, buffer_entry);
-
-		switch (buffer_entry[1]) {
-		case 0x0000: /* One key pressed or event occurred */
-		case 0x0012: /* Event with extended data occurred */
-			if (len > 2)
-				dell_wmi_process_key(wdev, buffer_entry[1],
-						     buffer_entry[2]);
-			/* Extended data is currently ignored */
-			break;
-		case 0x0010: /* Sequence of keys pressed */
-		case 0x0011: /* Sequence of events occurred */
-			for (i = 2; i < len; ++i)
-				dell_wmi_process_key(wdev, buffer_entry[1],
-						     buffer_entry[i]);
-			break;
-		default: /* Unknown event */
-			pr_info("Unknown WMI event type 0x%x\n",
-				(int)buffer_entry[1]);
-			break;
-		}
-
-		buffer_entry += len;
-
-	}
+    while (buffer_entry < buffer_end) {
+
+        len = buffer_entry[0];
+        if (len == 0)
+            break;
+
+        len++;
+
+        if (buffer_entry + len > buffer_end) {
+            pr_warn("Invalid length of WMI event\n");
+            break;
+        }
+
+        pr_debug("Process buffer (%*ph)\n", len*2, buffer_entry);
+
+        switch (buffer_entry[1]) {
+            case 0x0000: /* One key pressed or event occurred */
+                if (len > 2)
+                    dell_wmi_process_key(wdev, buffer_entry[1],
+                            buffer_entry[2]);
+                break;
+            case 0x0010: /* Sequence of keys pressed */
+            case 0x0011: /* Sequence of events occurred */
+                for (i = 2; i < len; ++i)
+                    dell_wmi_process_key(wdev, buffer_entry[1],
+                            buffer_entry[i]);
+                break;
+            case 0x0012:
+#if IS_ENABLED(CONFIG_DELL_PRIVACY)
+                if (dell_privacy_valid()) {
+                    dell_privacy_process_event(buffer_entry[1], buffer_entry[3], 
+                            buffer_entry[4]);
+                } else {
+                    if (len > 2)
+                        dell_wmi_process_key(wdev, buffer_entry[1], buffer_entry[2]);
+                }
+#else
+                /* Extended data is currently ignored */
+                if (len > 2)
+                    dell_wmi_process_key(wdev, buffer_entry[1], buffer_entry[2]);
+#endif
+                break;
+            default: /* Unknown event */
+                pr_info("Unknown WMI event type 0x%x\n",
+                        (int)buffer_entry[1]);
+                break;
+        }
+
+        buffer_entry += len;
+
+    }
 
 }
 
-- 
2.25.1