diff options
Diffstat (limited to 'drivers/platform/x86/huawei-wmi.c')
| -rw-r--r-- | drivers/platform/x86/huawei-wmi.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/drivers/platform/x86/huawei-wmi.c b/drivers/platform/x86/huawei-wmi.c new file mode 100644 index 000000000000..59872f87b741 --- /dev/null +++ b/drivers/platform/x86/huawei-wmi.c @@ -0,0 +1,208 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Huawei WMI hotkeys + * + * Copyright (C) 2018 Ayman Bagabas <ayman.bagabas@gmail.com> + */ + +#include <linux/acpi.h> +#include <linux/input.h> +#include <linux/input/sparse-keymap.h> +#include <linux/leds.h> +#include <linux/module.h> +#include <linux/wmi.h> + +/* + * Huawei WMI GUIDs + */ +#define WMI0_EVENT_GUID "59142400-C6A3-40fa-BADB-8A2652834100" +#define AMW0_EVENT_GUID "ABBC0F5C-8EA1-11D1-A000-C90629100000" + +#define WMI0_EXPENSIVE_GUID "39142400-C6A3-40fa-BADB-8A2652834100" + +struct huawei_wmi_priv { + struct input_dev *idev; + struct led_classdev cdev; + acpi_handle handle; + char *acpi_method; +}; + +static const struct key_entry huawei_wmi_keymap[] = { + { 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| key + { KE_KEY, 0x28a, { KEY_CONFIG } }, + // Keyboard backlight + { KE_IGNORE, 0x293, { KEY_KBDILLUMTOGGLE } }, + { KE_IGNORE, 0x294, { KEY_KBDILLUMUP } }, + { KE_IGNORE, 0x295, { KEY_KBDILLUMUP } }, + { KE_END, 0 } +}; + +static int huawei_wmi_micmute_led_set(struct led_classdev *led_cdev, + enum led_brightness brightness) +{ + struct huawei_wmi_priv *priv = dev_get_drvdata(led_cdev->dev->parent); + acpi_status status; + union acpi_object args[3]; + struct acpi_object_list arg_list = { + .pointer = args, + .count = ARRAY_SIZE(args), + }; + + args[0].type = args[1].type = args[2].type = ACPI_TYPE_INTEGER; + args[1].integer.value = 0x04; + + if (strcmp(priv->acpi_method, "SPIN") == 0) { + args[0].integer.value = 0; + args[2].integer.value = brightness ? 1 : 0; + } else if (strcmp(priv->acpi_method, "WPIN") == 0) { + args[0].integer.value = 1; + args[2].integer.value = brightness ? 0 : 1; + } else { + return -EINVAL; + } + + status = acpi_evaluate_object(priv->handle, priv->acpi_method, &arg_list, NULL); + if (ACPI_FAILURE(status)) + return -ENXIO; + + return 0; +} + +static int huawei_wmi_leds_setup(struct wmi_device *wdev) +{ + struct huawei_wmi_priv *priv = dev_get_drvdata(&wdev->dev); + + priv->handle = ec_get_handle(); + if (!priv->handle) + return 0; + + if (acpi_has_method(priv->handle, "SPIN")) + priv->acpi_method = "SPIN"; + else if (acpi_has_method(priv->handle, "WPIN")) + priv->acpi_method = "WPIN"; + else + return 0; + + priv->cdev.name = "platform::micmute"; + priv->cdev.max_brightness = 1; + priv->cdev.brightness_set_blocking = huawei_wmi_micmute_led_set; + priv->cdev.default_trigger = "audio-micmute"; + priv->cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE); + priv->cdev.dev = &wdev->dev; + priv->cdev.flags = LED_CORE_SUSPENDRESUME; + + return devm_led_classdev_register(&wdev->dev, &priv->cdev); +} + +static void huawei_wmi_process_key(struct wmi_device *wdev, int code) +{ + struct huawei_wmi_priv *priv = dev_get_drvdata(&wdev->dev); + const struct key_entry *key; + + /* + * WMI0 uses code 0x80 to indicate a hotkey event. + * The actual key is fetched from the method WQ00 + * using WMI0_EXPENSIVE_GUID. + */ + if (code == 0x80) { + struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *obj; + acpi_status status; + + status = wmi_query_block(WMI0_EXPENSIVE_GUID, 0, &response); + if (ACPI_FAILURE(status)) + return; + + obj = (union acpi_object *)response.pointer; + if (obj && obj->type == ACPI_TYPE_INTEGER) + code = obj->integer.value; + + kfree(response.pointer); + } + + key = sparse_keymap_entry_from_scancode(priv->idev, code); + if (!key) { + dev_info(&wdev->dev, "Unknown key pressed, code: 0x%04x\n", code); + return; + } + + sparse_keymap_report_entry(priv->idev, key, 1, true); +} + +static void huawei_wmi_notify(struct wmi_device *wdev, + union acpi_object *obj) +{ + if (obj->type == ACPI_TYPE_INTEGER) + huawei_wmi_process_key(wdev, obj->integer.value); + else + dev_info(&wdev->dev, "Bad response type %d\n", obj->type); +} + +static int huawei_wmi_input_setup(struct wmi_device *wdev) +{ + struct huawei_wmi_priv *priv = dev_get_drvdata(&wdev->dev); + int err; + + priv->idev = devm_input_allocate_device(&wdev->dev); + if (!priv->idev) + return -ENOMEM; + + priv->idev->name = "Huawei WMI hotkeys"; + priv->idev->phys = "wmi/input0"; + priv->idev->id.bustype = BUS_HOST; + priv->idev->dev.parent = &wdev->dev; + + err = sparse_keymap_setup(priv->idev, huawei_wmi_keymap, NULL); + if (err) + return err; + + return input_register_device(priv->idev); +} + +static int huawei_wmi_probe(struct wmi_device *wdev) +{ + struct huawei_wmi_priv *priv; + int err; + + priv = devm_kzalloc(&wdev->dev, sizeof(struct huawei_wmi_priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + dev_set_drvdata(&wdev->dev, priv); + + err = huawei_wmi_input_setup(wdev); + if (err) + return err; + + return huawei_wmi_leds_setup(wdev); +} + +static const struct wmi_device_id huawei_wmi_id_table[] = { + { .guid_string = WMI0_EVENT_GUID }, + { .guid_string = AMW0_EVENT_GUID }, + { } +}; + +static struct wmi_driver huawei_wmi_driver = { + .driver = { + .name = "huawei-wmi", + }, + .id_table = huawei_wmi_id_table, + .probe = huawei_wmi_probe, + .notify = huawei_wmi_notify, +}; + +module_wmi_driver(huawei_wmi_driver); + +MODULE_ALIAS("wmi:"WMI0_EVENT_GUID); +MODULE_ALIAS("wmi:"AMW0_EVENT_GUID); +MODULE_AUTHOR("Ayman Bagabas <ayman.bagabas@gmail.com>"); +MODULE_DESCRIPTION("Huawei WMI hotkeys"); +MODULE_LICENSE("GPL v2"); |