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@gmail.com --- drivers/platform/x86/Kconfig | 11 ++ drivers/platform/x86/Makefile | 1 + drivers/platform/x86/huawei_wmi.c | 235 ++++++++++++++++++++++++++++++ 3 files changed, 247 insertions(+) create mode 100644 drivers/platform/x86/huawei_wmi.c
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 54f6a40c75c6..b45c1294df7e 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -1288,6 +1288,17 @@ config INTEL_ATOMISP2_PM To compile this driver as a module, choose M here: the module will be called intel_atomisp2_pm.
+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 the micmute + LED found on some of these laptops. + endif # X86_PLATFORM_DEVICES
config PMC_ATOM diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile index 39ae94135406..ee93655d8bc1 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-$(CONFIG_HUAWEI_LAPTOP) += huawei_wmi.o obj-$(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..658c44ab2126 --- /dev/null +++ b/drivers/platform/x86/huawei_wmi.c @@ -0,0 +1,235 @@ +/* + * Huawei WMI hotkeys + * + * 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/acpi.h> +#include <linux/init.h> +#include <linux/input.h> +#include <linux/input/sparse-keymap.h> +#include <linux/module.h> + +MODULE_AUTHOR("Ayman Bagabas ayman.bagabas@gmail.com"); +MODULE_DESCRIPTION("Huawei WMI hotkeys"); +MODULE_LICENSE("GPL"); + +/* + * 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_PROG1 } }, + // 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; + +int huawei_wmi_micmute_led_set(bool on) +{ + acpi_handle handle = ACPI_HANDLE(&inputdev->dev); + char *method; + union acpi_object args[3]; + args[0].type = args[1].type = args[2].type = ACPI_TYPE_INTEGER; + args[1].integer.value = 0x04; + struct acpi_object_list arg_list = { + .pointer = args, + .count = ARRAY_SIZE(args), + }; + + 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 { + pr_err("Unable to find ACPI method\n"); + return -1; + } + + acpi_evaluate_object(handle, method, &arg_list, NULL); + + return 0; +} +EXPORT_SYMBOL_GPL(huawei_wmi_micmute_led_set); + +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[] = { + { .type = ACPI_TYPE_INTEGER }, + }; + args[0].integer.value = 0; + struct acpi_object_list arg_list = { + .pointer = args, + .count = ARRAY_SIZE(args), + }; + + 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 acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *obj; + acpi_status status; + struct input_dev *inputdev = (struct input_dev*)context; + + 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("No known WMI GUID found\n"); + return -ENODEV; + } + + err = huawei_wmi_input_init(); + if (err) { + pr_err("Failed to setup input device\n"); + return err; + } + + return 0; +} + +static void __exit huawei_wmi_exit(void) +{ + huawei_wmi_input_exit(); +} + +module_init(huawei_wmi_init); +module_exit(huawei_wmi_exit);