This driver adds support for missing hotkeys on some Huawei laptops.
Currently, only Huawei Matebook X and Matebook X Pro is supported.
Signed-off-by: Ayman Bagabas <ayman.bagabas@xxxxxxxxx>
---
drivers/platform/x86/Kconfig | 15 ++
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/huawei-wmi.c | 247 ++++++++++++++++++++++++++++++
3 files changed, 263 insertions(+)
create mode 100644 drivers/platform/x86/huawei-wmi.c
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 87f70e8f4dd0..0f9db4275fb4 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1292,6 +1292,21 @@ config INTEL_ATOMISP2_PM
To compile this driver as a module, choose M here: the module
will be called intel_atomisp2_pm.
+config HUAWEI_WMI
+ tristate "Huawei WMI hotkeys driver"
+ depends on ACPI_WMI
+ depends on INPUT
+ select INPUT_SPARSEKMAP
+ select LEDS_TRIGGERS
+ select LEDS_TRIGGER_AUDIO
+ help
+ This driver provides support for Huawei WMI hotkeys.
+ It enables the missing keys and adds support to the micmute
+ LED found on some of these laptops.
+
+ To compile this driver as a module, choose M here: the module
+ will be called huawei-wmi.
+
endif # X86_PLATFORM_DEVICES
config PMC_ATOM
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 39ae94135406..d841c550e3cc 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -32,6 +32,7 @@ obj-$(CONFIG_ACERHDF) += acerhdf.o
obj-$(CONFIG_HP_ACCEL) += hp_accel.o
obj-$(CONFIG_HP_WIRELESS) += hp-wireless.o
obj-$(CONFIG_HP_WMI) += hp-wmi.o
+obj-$(CONFIG_HUAWEI_WMI) += huawei-wmi.o
obj-$(CONFIG_AMILO_RFKILL) += amilo-rfkill.o
obj-$(CONFIG_GPD_POCKET_FAN) += gpd-pocket-fan.o
obj-$(CONFIG_TC1100_WMI) += tc1100-wmi.o
diff --git a/drivers/platform/x86/huawei-wmi.c b/drivers/platform/x86/huawei-wmi.c
new file mode 100644
index 000000000000..b6157c5b7f4a
--- /dev/null
+++ b/drivers/platform/x86/huawei-wmi.c
@@ -0,0 +1,247 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Huawei WMI hotkeys
+ *
+ * Copyright (C) 2018 Ayman Bagabas <ayman.bagabas@xxxxxxxxx>
+ */
+
+#include <linux/acpi.h>
+#include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+
+MODULE_AUTHOR("Ayman Bagabas <ayman.bagabas@xxxxxxxxx>");
+MODULE_DESCRIPTION("Huawei WMI hotkeys");
+MODULE_LICENSE("GPL v2");
+
+/*
+ * Huawei WMI Events GUIDs
+ */
+#define MBX_EVENT_GUID "59142400-C6A3-40fa-BADB-8A2652834100"
+#define MBXP_EVENT_GUID "ABBC0F5C-8EA1-11D1-A000-C90629100000"
+
+MODULE_ALIAS("wmi:"MBX_EVENT_GUID);
+MODULE_ALIAS("wmi:"MBXP_EVENT_GUID);
+
+static const struct key_entry huawei_wmi_keymap[] __initconst = {
+ { KE_KEY, 0x281, { KEY_BRIGHTNESSDOWN } },
+ { KE_KEY, 0x282, { KEY_BRIGHTNESSUP } },
+ { KE_KEY, 0x284, { KEY_MUTE } },
+ { KE_KEY, 0x285, { KEY_VOLUMEDOWN } },
+ { KE_KEY, 0x286, { KEY_VOLUMEUP } },
+ { KE_KEY, 0x287, { KEY_MICMUTE } },
+ { KE_KEY, 0x289, { KEY_WLAN } },
+ // Huawei |M| button
+ { KE_KEY, 0x28a, { KEY_CONFIG } },
+ // Keyboard light
+ { KE_IGNORE, 0x293, { KEY_KBDILLUMTOGGLE } },
+ { KE_IGNORE, 0x294, { KEY_KBDILLUMUP } },
+ { KE_IGNORE, 0x295, { KEY_KBDILLUMUP } },
+ { KE_END, 0 }
+};
+
+static char *event_guid;
+static struct input_dev *inputdev;
+
+static int huawei_wmi_micmute_led_set(bool on)
+{
+ acpi_handle handle;
+ char *method;
+ union acpi_object args[3];
+ struct acpi_object_list arg_list = {
+ .pointer = args,
+ .count = ARRAY_SIZE(args),
+ };
+
+ handle = ACPI_HANDLE(&inputdev->dev);
+ args[0].type = args[1].type = args[2].type = ACPI_TYPE_INTEGER;
+ args[1].integer.value = 0x04;
+
+ if (acpi_has_method(handle, method = "\\_SB.PCI0.LPCB.EC0.SPIN")) {
+ args[0].integer.value = 0;
+ args[2].integer.value = on ? 1 : 0;
+ } else if (acpi_has_method(handle, method = "\\_SB.PCI0.LPCB.EC0.WPIN")) {
+ args[0].integer.value = 1;
+ args[2].integer.value = on ? 0 : 1;
+ } else {
+ dev_err(&inputdev->dev, "Unable to find ACPI method\n");
+ return -ENOSYS;
+ }
+
+ acpi_evaluate_object(handle, method, &arg_list, NULL);
+
+ return 0;
+}
+
+static int micmute_led_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ int state = brightness != LED_OFF;
+ int err;
+
+ err = huawei_wmi_micmute_led_set(state);
+ return err < 0 ? err : 0;
+}
+
+static struct led_classdev micmute_led_cdev = {
+ .name = "huawei::micmute",
+ .max_brightness = 1,
+ .brightness_set_blocking = micmute_led_set,
+ .default_trigger = "audio-micmute",
+};
+
+static void huawei_wmi_process_key(struct input_dev *inputdev, int code)
+{
+ const struct key_entry *key;
+
+ /*
+ * MBX uses code 0x80 to indicate a hotkey event.
+ * The actual key is fetched from the method WQ00.
+ */
+ if (code == 0x80) {
+ acpi_status status;
+ unsigned long long result;
+ const char *method = "\\WMI0.WQ00";
+ union acpi_object args[1];
+ struct acpi_object_list arg_list = {
+ .pointer = args,
+ .count = ARRAY_SIZE(args),
+ };
+
+ args[0].type = ACPI_TYPE_INTEGER;
+ args[0].integer.value = 0;
+
+ status = acpi_evaluate_integer(ACPI_HANDLE(&inputdev->dev), (char *)method, &arg_list, &result);
+ if (ACPI_FAILURE(status)) {
+ dev_err(&inputdev->dev, "Unable to evaluate ACPI method %s\n", method);
+ return;
+ }
+
+ code = result;
+ }
+
+ key = sparse_keymap_entry_from_scancode(inputdev, code);
+ if (!key) {
+ dev_info(&inputdev->dev, "Unknown key pressed, code: 0x%04x\n", code);
+ return;
+ }
+
+ /*
+ * The MBXP handles backlight natively using ACPI,
+ * but not the MBX. If MBXP is being used, skip reporting event.
+ */
+ if ((key->sw.code == KEY_BRIGHTNESSUP || key->sw.code == KEY_BRIGHTNESSDOWN)
+ && strcmp(event_guid, MBXP_EVENT_GUID) == 0)
+ return;
+
+ sparse_keymap_report_entry(inputdev, key, 1, true);
+}
+
+static void huawei_wmi_notify(u32 value, void *context)
+{
+ struct input_dev *inputdev = context;
+ struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *obj;
+ acpi_status status;
+
+ status = wmi_get_event_data(value, &response);
+ if (ACPI_FAILURE(status)) {
+ dev_err(&inputdev->dev, "Bad event status 0x%x\n", status);
+ return;
+ }
+
+ obj = (union acpi_object *)response.pointer;
+ if (!obj)
+ return;
+
+ if (obj->type == ACPI_TYPE_INTEGER)
+ huawei_wmi_process_key(inputdev, obj->integer.value);
+ else
+ dev_info(&inputdev->dev, "Unknown response received %d\n", obj->type);
+
+ kfree(response.pointer);
+}
+
+static int huawei_wmi_input_init(void)
+{
+ acpi_status status;
+ int err;
+
+ inputdev = input_allocate_device();
+ if (!inputdev)
+ return -ENOMEM;
+
+ inputdev->name = "Huawei WMI hotkeys";
+ inputdev->phys = "wmi/input0";
+ inputdev->id.bustype = BUS_HOST;
+
+ err = sparse_keymap_setup(inputdev, huawei_wmi_keymap, NULL);
+ if (err)
+ goto err_free_dev;
+
+ status = wmi_install_notify_handler(event_guid,
+ huawei_wmi_notify,
+ inputdev);
+ if (ACPI_FAILURE(status)) {
+ err = -EIO;
+ goto err_free_dev;
+ }
+
+ err = input_register_device(inputdev);
+ if (err)
+ goto err_remove_notifier;
+
+ return 0;
+
+err_remove_notifier:
+ wmi_remove_notify_handler(event_guid);
+err_free_dev:
+ input_free_device(inputdev);
+ return err;
+}
+
+static void huawei_wmi_input_exit(void)
+{
+ wmi_remove_notify_handler(event_guid);
+ input_unregister_device(inputdev);
+}
+
+static int __init huawei_wmi_init(void)
+{
+ int err;
+
+ if (wmi_has_guid(MBX_EVENT_GUID)) {
+ event_guid = MBX_EVENT_GUID;
+ } else if (wmi_has_guid(MBXP_EVENT_GUID)) {
+ event_guid = MBXP_EVENT_GUID;
+ } else {
+ pr_warn("Compatible WMI GUID not found\n");
+ return -ENODEV;
+ }
+
+ err = huawei_wmi_input_init();
+ if (err)
+ goto err_input;
+
+ micmute_led_cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE);
+ err = led_classdev_register(&inputdev->dev, &micmute_led_cdev);
+ if (err)
+ goto err_leds;
+
+ return 0;
+
+err_leds:
+ huawei_wmi_input_exit();
+err_input:
+ return err;
+}
+
+static void __exit huawei_wmi_exit(void)
+{
+ led_classdev_unregister(&micmute_led_cdev);
+ huawei_wmi_input_exit();
+}
+
+module_init(huawei_wmi_init);
+module_exit(huawei_wmi_exit);
--
2.19.1
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