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// 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, const void *context)
{
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_DEVICE_TABLE(wmi, huawei_wmi_id_table);
MODULE_AUTHOR("Ayman Bagabas <ayman.bagabas@gmail.com>");
MODULE_DESCRIPTION("Huawei WMI hotkeys");
MODULE_LICENSE("GPL v2");
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