// SPDX-License-Identifier: GPL-2.0-only
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/*
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* PEAQ 2-in-1 WMI hotkey driver
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* Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
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*/
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#include <linux/acpi.h>
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#include <linux/dmi.h>
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#include <linux/input.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#define PEAQ_DOLBY_BUTTON_GUID "ABBC0F6F-8EA1-11D1-00A0-C90629100000"
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#define PEAQ_DOLBY_BUTTON_METHOD_ID 5
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#define PEAQ_POLL_INTERVAL_MS 250
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#define PEAQ_POLL_IGNORE_MS 500
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#define PEAQ_POLL_MAX_MS 1000
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MODULE_ALIAS("wmi:"PEAQ_DOLBY_BUTTON_GUID);
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static struct input_dev *peaq_poll_dev;
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/*
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* The Dolby button (yes really a Dolby button) causes an ACPI variable to get
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* set on both press and release. The WMI method checks and clears that flag.
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* So for a press + release we will get back One from the WMI method either once
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* (if polling after the release) or twice (polling between press and release).
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* We ignore events for 0.5s after the first event to avoid reporting 2 presses.
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*/
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static void peaq_wmi_poll(struct input_dev *input_dev)
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{
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static unsigned long last_event_time;
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static bool had_events;
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union acpi_object obj;
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acpi_status status;
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u32 dummy = 0;
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struct acpi_buffer input = { sizeof(dummy), &dummy };
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struct acpi_buffer output = { sizeof(obj), &obj };
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status = wmi_evaluate_method(PEAQ_DOLBY_BUTTON_GUID, 0,
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PEAQ_DOLBY_BUTTON_METHOD_ID,
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&input, &output);
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if (ACPI_FAILURE(status))
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return;
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if (obj.type != ACPI_TYPE_INTEGER) {
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dev_err(&input_dev->dev,
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"Error WMBC did not return an integer\n");
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return;
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}
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if (!obj.integer.value)
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return;
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if (had_events && time_before(jiffies, last_event_time +
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msecs_to_jiffies(PEAQ_POLL_IGNORE_MS)))
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return;
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input_event(input_dev, EV_KEY, KEY_SOUND, 1);
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input_sync(input_dev);
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input_event(input_dev, EV_KEY, KEY_SOUND, 0);
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input_sync(input_dev);
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last_event_time = jiffies;
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had_events = true;
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}
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/* Some other devices (Shuttle XS35) use the same WMI GUID for other purposes */
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static const struct dmi_system_id peaq_dmi_table[] __initconst = {
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{
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "PEAQ"),
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DMI_MATCH(DMI_PRODUCT_NAME, "PEAQ PMM C1010 MD99187"),
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},
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},
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{}
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};
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static int __init peaq_wmi_init(void)
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{
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int err;
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/* WMI GUID is not unique, also check for a DMI match */
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if (!dmi_check_system(peaq_dmi_table))
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return -ENODEV;
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if (!wmi_has_guid(PEAQ_DOLBY_BUTTON_GUID))
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return -ENODEV;
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peaq_poll_dev = input_allocate_device();
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if (!peaq_poll_dev)
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return -ENOMEM;
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peaq_poll_dev->name = "PEAQ WMI hotkeys";
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peaq_poll_dev->phys = "wmi/input0";
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peaq_poll_dev->id.bustype = BUS_HOST;
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input_set_capability(peaq_poll_dev, EV_KEY, KEY_SOUND);
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err = input_setup_polling(peaq_poll_dev, peaq_wmi_poll);
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if (err)
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goto err_out;
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input_set_poll_interval(peaq_poll_dev, PEAQ_POLL_INTERVAL_MS);
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input_set_max_poll_interval(peaq_poll_dev, PEAQ_POLL_MAX_MS);
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err = input_register_device(peaq_poll_dev);
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if (err)
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goto err_out;
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return 0;
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err_out:
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input_free_device(peaq_poll_dev);
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return err;
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}
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static void __exit peaq_wmi_exit(void)
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{
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input_unregister_device(peaq_poll_dev);
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}
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module_init(peaq_wmi_init);
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module_exit(peaq_wmi_exit);
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MODULE_DESCRIPTION("PEAQ 2-in-1 WMI hotkey driver");
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MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
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MODULE_LICENSE("GPL");
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