mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-29 22:14:41 +08:00
890f658c10
There is a harmless static checker warning here that unsigned values are always >= 0. The code looks like: if (peaq_ignore_events_counter && --peaq_ignore_events_counter >= 0) The first part of the condition ensures that we never wrap around so the code works as intended. I've tweaked it slightly to avoid the warning. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
/*
|
|
* PEAQ 2-in-1 WMI hotkey driver
|
|
* Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/input-polldev.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
|
|
#define PEAQ_DOLBY_BUTTON_GUID "ABBC0F6F-8EA1-11D1-00A0-C90629100000"
|
|
#define PEAQ_DOLBY_BUTTON_METHOD_ID 5
|
|
#define PEAQ_POLL_INTERVAL_MS 250
|
|
#define PEAQ_POLL_IGNORE_MS 500
|
|
#define PEAQ_POLL_MAX_MS 1000
|
|
|
|
MODULE_ALIAS("wmi:"PEAQ_DOLBY_BUTTON_GUID);
|
|
|
|
static unsigned int peaq_ignore_events_counter;
|
|
static struct input_polled_dev *peaq_poll_dev;
|
|
|
|
/*
|
|
* The Dolby button (yes really a Dolby button) causes an ACPI variable to get
|
|
* set on both press and release. The WMI method checks and clears that flag.
|
|
* So for a press + release we will get back One from the WMI method either once
|
|
* (if polling after the release) or twice (polling between press and release).
|
|
* We ignore events for 0.5s after the first event to avoid reporting 2 presses.
|
|
*/
|
|
static void peaq_wmi_poll(struct input_polled_dev *dev)
|
|
{
|
|
union acpi_object obj;
|
|
acpi_status status;
|
|
u32 dummy = 0;
|
|
|
|
struct acpi_buffer input = { sizeof(dummy), &dummy };
|
|
struct acpi_buffer output = { sizeof(obj), &obj };
|
|
|
|
status = wmi_evaluate_method(PEAQ_DOLBY_BUTTON_GUID, 1,
|
|
PEAQ_DOLBY_BUTTON_METHOD_ID,
|
|
&input, &output);
|
|
if (ACPI_FAILURE(status))
|
|
return;
|
|
|
|
if (obj.type != ACPI_TYPE_INTEGER) {
|
|
dev_err(&peaq_poll_dev->input->dev,
|
|
"Error WMBC did not return an integer\n");
|
|
return;
|
|
}
|
|
|
|
if (peaq_ignore_events_counter && peaq_ignore_events_counter--)
|
|
return;
|
|
|
|
if (obj.integer.value) {
|
|
input_event(peaq_poll_dev->input, EV_KEY, KEY_SOUND, 1);
|
|
input_sync(peaq_poll_dev->input);
|
|
input_event(peaq_poll_dev->input, EV_KEY, KEY_SOUND, 0);
|
|
input_sync(peaq_poll_dev->input);
|
|
peaq_ignore_events_counter = max(1u,
|
|
PEAQ_POLL_IGNORE_MS / peaq_poll_dev->poll_interval);
|
|
}
|
|
}
|
|
|
|
static int __init peaq_wmi_init(void)
|
|
{
|
|
if (!wmi_has_guid(PEAQ_DOLBY_BUTTON_GUID))
|
|
return -ENODEV;
|
|
|
|
peaq_poll_dev = input_allocate_polled_device();
|
|
if (!peaq_poll_dev)
|
|
return -ENOMEM;
|
|
|
|
peaq_poll_dev->poll = peaq_wmi_poll;
|
|
peaq_poll_dev->poll_interval = PEAQ_POLL_INTERVAL_MS;
|
|
peaq_poll_dev->poll_interval_max = PEAQ_POLL_MAX_MS;
|
|
peaq_poll_dev->input->name = "PEAQ WMI hotkeys";
|
|
peaq_poll_dev->input->phys = "wmi/input0";
|
|
peaq_poll_dev->input->id.bustype = BUS_HOST;
|
|
input_set_capability(peaq_poll_dev->input, EV_KEY, KEY_SOUND);
|
|
|
|
return input_register_polled_device(peaq_poll_dev);
|
|
}
|
|
|
|
static void __exit peaq_wmi_exit(void)
|
|
{
|
|
if (!wmi_has_guid(PEAQ_DOLBY_BUTTON_GUID))
|
|
return;
|
|
|
|
input_unregister_polled_device(peaq_poll_dev);
|
|
}
|
|
|
|
module_init(peaq_wmi_init);
|
|
module_exit(peaq_wmi_exit);
|
|
|
|
MODULE_DESCRIPTION("PEAQ 2-in-1 WMI hotkey driver");
|
|
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
|
|
MODULE_LICENSE("GPL");
|