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Subject[PATCH] x86: add support for Huawei WMI hotkeys.
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From bc069762e7e86dd3ab39e55d7b145deb85884dec Mon Sep 17 00:00:00 2001
From: Ayman Bagabas <ayman.bagabas@gmail.com>
Date: Wed, 31 Oct 2018 11:24:43 -0400
Subject: [PATCH 1/3] x86: add support for Huawei WMI hotkeys.

This driver adds support for missing hotkeys on some Huawei laptops.
Currently, only Huawei Matebook X Pro is supported. The driver
recognizes the following keys: brightness keys, micmute, wlan, and
Huawei special key. The brightness keys are ignored since they work out
of the box.

Signed-off-by: Ayman Bagabas <ayman.bagabas@gmail.com>
---
drivers/platform/x86/Kconfig | 13 ++
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/huawei_wmi.c | 225 ++++++++++++++++++++++++++++++
3 files changed, 239 insertions(+)
create mode 100644 drivers/platform/x86/huawei_wmi.c

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 0c1aa6c314f5..c6813981e45c 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1229,6 +1229,19 @@ config I2C_MULTI_INSTANTIATE
To compile this driver as a module, choose M here: the module
will be called i2c-multi-instantiate.

+config HUAWEI_LAPTOP
+ tristate "Huawei WMI hotkeys driver"
+ depends on ACPI
+ depends on ACPI_WMI
+ depends on INPUT
+ select INPUT_SPARSEKMAP
+ help
+ This driver provides support for Huawei WMI hotkeys.
+ It enables the missing keys and adds support to micmute
+ led found on these laptops.q
+ Supported devices are:
+ - Matebook X Pro
+
endif # X86_PLATFORM_DEVICES

config PMC_ATOM
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index e6d1becf81ce..5984354e18ff 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -29,6 +29,7 @@ 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-$(CONFIG_HUAWEI_LAPTOP) += huawei_wmi.o
obj-$(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..a430ff860929
--- /dev/null
+++ b/drivers/platform/x86/huawei_wmi.c
@@ -0,0 +1,225 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Huawei WMI Hotkeys Driver
+ *
+ * Copyright (C) 2018 Ayman Bagabas <ayman.bagabas@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
+#include <linux/acpi.h>
+#include <linux/wmi.h>
+#include <linux/huawei_wmi.h>
+
+MODULE_AUTHOR("Ayman Bagabas <ayman.bagabas@gmail.com>");
+MODULE_DESCRIPTION("Huawei WMI hotkeys");
+MODULE_LICENSE("GPL");
+
+#define DEVICE_NAME "huawei"
+#define MODULE_NAME DEVICE_NAME"_wmi"
+
+/*
+ * Huawei WMI Devices GUIDs
+ */
+#define AMW0_GUID "ABBC0F5B-8EA1-11D1-A000-C90629100000" // \_SB.AMW0
+
+/*
+ * Huawei WMI Events GUIDs
+ */
+#define EVENT_GUID "ABBC0F5C-8EA1-11D1-A000-C90629100000"
+
+MODULE_ALIAS("wmi:"AMW0_GUID);
+MODULE_ALIAS("wmi:"EVENT_GUID);
+
+enum {
+ MICMUTE_LED_ON = 0x00010B04,
+ MICMUTE_LED_OFF = 0x00000B04,
+};
+
+static const struct key_entry huawei_wmi_keymap[] __initconst = {
+ { KE_IGNORE, 0x281, { KEY_BRIGHTNESSDOWN } },
+ { KE_IGNORE, 0x282, { KEY_BRIGHTNESSUP } },
+ { KE_IGNORE, 0x283, { KEY_KBDILLUMTOGGLE } },
+ { KE_KEY, 0x287, { KEY_MICMUTE } },
+ { KE_KEY, 0x289, { KEY_WLAN } },
+ // Huawei |M| button
+ { KE_KEY, 0x28a, { KEY_PROG1 } },
+ { KE_END, 0 }
+};
+
+struct huawei_wmi_device {
+ struct input_dev *inputdev;
+};
+static struct huawei_wmi_device *wmi_device;
+
+int huawei_wmi_micmute_led_set(bool on)
+{
+ u32 args = (on) ? MICMUTE_LED_ON : MICMUTE_LED_OFF;
+ struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
+ acpi_status status;
+
+ status = wmi_evaluate_method(AMW0_GUID, 0, 1, &input, NULL);
+ if (ACPI_FAILURE(status))
+ return status;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(huawei_wmi_micmute_led_set);
+
+static void huawei_wmi_process_key(struct input_dev *input_dev, int code)
+{
+ const struct key_entry *key;
+
+ key = sparse_keymap_entry_from_scancode(input_dev, code);
+
+ if (!key) {
+ pr_info("%s: Unknown key pressed, code: 0x%04x\n",
+ MODULE_NAME, code);
+ return;
+ }
+
+ sparse_keymap_report_entry(input_dev, key, 1, true);
+}
+
+static void huawei_wmi_notify(u32 value, void *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)) {
+ pr_err("%s: Bad event status 0x%x\n",
+ MODULE_NAME, status);
+ return;
+ }
+
+ obj = (union acpi_object *)response.pointer;
+
+ if (!obj)
+ return;
+
+ if (obj->type == ACPI_TYPE_INTEGER)
+ huawei_wmi_process_key(wmi_device->inputdev,
+ obj->integer.value);
+ else
+ pr_info("%s: Unknown response received %d\n",
+ MODULE_NAME, obj->type);
+
+ kfree(response.pointer);
+}
+
+static int huawei_input_init(void)
+{
+ acpi_status status;
+ int err;
+
+ wmi_device->inputdev = input_allocate_device();
+ if (!wmi_device->inputdev)
+ return -ENOMEM;
+
+ wmi_device->inputdev->name = "Huawei WMI hotkeys";
+ wmi_device->inputdev->phys = "wmi/input0";
+ wmi_device->inputdev->id.bustype = BUS_HOST;
+
+ err = sparse_keymap_setup(wmi_device->inputdev,
+ huawei_wmi_keymap, NULL);
+ if (err)
+ goto err_free_dev;
+
+ status = wmi_install_notify_handler(EVENT_GUID,
+ huawei_wmi_notify,
+ NULL);
+
+ if (ACPI_FAILURE(status)) {
+ err = -EIO;
+ goto err_free_dev;
+ }
+
+ err = input_register_device(wmi_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(wmi_device->inputdev);
+ return err;
+}
+
+static void huawei_input_exit(void)
+{
+ wmi_remove_notify_handler(EVENT_GUID);
+ input_unregister_device(wmi_device->inputdev);
+}
+
+static int __init huawei_wmi_setup(void)
+{
+ int err;
+
+ wmi_device = kmalloc(sizeof(struct huawei_wmi_device), GFP_KERNEL);
+ if (!wmi_device)
+ return -ENOMEM;
+
+ err = huawei_input_init();
+ if (err)
+ goto err_input;
+
+ return 0;
+
+err_input:
+ return err;
+}
+
+static void huawei_wmi_destroy(void)
+{
+ huawei_input_exit();
+ kfree(wmi_device);
+}
+
+static int __init huawei_wmi_init(void)
+{
+ int err;
+
+ if (!wmi_has_guid(EVENT_GUID)) {
+ pr_warn("%s: No known WMI GUID found\n", MODULE_NAME);
+ return -ENODEV;
+ }
+
+ err = huawei_wmi_setup();
+ if (err) {
+ pr_err("%s: Failed to setup device\n", MODULE_NAME);
+ return err;
+ }
+
+ return 0;
+}
+
+static void __exit huawei_wmi_exit(void)
+{
+ huawei_wmi_destroy();
+ pr_debug("%s: Driver unloaded successfully\n", MODULE_NAME);
+}
+
+module_init(huawei_wmi_init);
+module_exit(huawei_wmi_exit);
--
2.17.2
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