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128 lines
3.2 KiB
128 lines
3.2 KiB
// 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 <[email protected]> |
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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 <[email protected]>"); |
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MODULE_LICENSE("GPL");
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