1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * PEAQ 2-in-1 WMI hotkey driver
4*4882a593Smuzhiyun * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <linux/acpi.h>
8*4882a593Smuzhiyun #include <linux/dmi.h>
9*4882a593Smuzhiyun #include <linux/input.h>
10*4882a593Smuzhiyun #include <linux/kernel.h>
11*4882a593Smuzhiyun #include <linux/module.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #define PEAQ_DOLBY_BUTTON_GUID "ABBC0F6F-8EA1-11D1-00A0-C90629100000"
14*4882a593Smuzhiyun #define PEAQ_DOLBY_BUTTON_METHOD_ID 5
15*4882a593Smuzhiyun #define PEAQ_POLL_INTERVAL_MS 250
16*4882a593Smuzhiyun #define PEAQ_POLL_IGNORE_MS 500
17*4882a593Smuzhiyun #define PEAQ_POLL_MAX_MS 1000
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun MODULE_ALIAS("wmi:"PEAQ_DOLBY_BUTTON_GUID);
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun static struct input_dev *peaq_poll_dev;
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun /*
24*4882a593Smuzhiyun * The Dolby button (yes really a Dolby button) causes an ACPI variable to get
25*4882a593Smuzhiyun * set on both press and release. The WMI method checks and clears that flag.
26*4882a593Smuzhiyun * So for a press + release we will get back One from the WMI method either once
27*4882a593Smuzhiyun * (if polling after the release) or twice (polling between press and release).
28*4882a593Smuzhiyun * We ignore events for 0.5s after the first event to avoid reporting 2 presses.
29*4882a593Smuzhiyun */
peaq_wmi_poll(struct input_dev * input_dev)30*4882a593Smuzhiyun static void peaq_wmi_poll(struct input_dev *input_dev)
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun static unsigned long last_event_time;
33*4882a593Smuzhiyun static bool had_events;
34*4882a593Smuzhiyun union acpi_object obj;
35*4882a593Smuzhiyun acpi_status status;
36*4882a593Smuzhiyun u32 dummy = 0;
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun struct acpi_buffer input = { sizeof(dummy), &dummy };
39*4882a593Smuzhiyun struct acpi_buffer output = { sizeof(obj), &obj };
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun status = wmi_evaluate_method(PEAQ_DOLBY_BUTTON_GUID, 0,
42*4882a593Smuzhiyun PEAQ_DOLBY_BUTTON_METHOD_ID,
43*4882a593Smuzhiyun &input, &output);
44*4882a593Smuzhiyun if (ACPI_FAILURE(status))
45*4882a593Smuzhiyun return;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun if (obj.type != ACPI_TYPE_INTEGER) {
48*4882a593Smuzhiyun dev_err(&input_dev->dev,
49*4882a593Smuzhiyun "Error WMBC did not return an integer\n");
50*4882a593Smuzhiyun return;
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun if (!obj.integer.value)
54*4882a593Smuzhiyun return;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun if (had_events && time_before(jiffies, last_event_time +
57*4882a593Smuzhiyun msecs_to_jiffies(PEAQ_POLL_IGNORE_MS)))
58*4882a593Smuzhiyun return;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun input_event(input_dev, EV_KEY, KEY_SOUND, 1);
61*4882a593Smuzhiyun input_sync(input_dev);
62*4882a593Smuzhiyun input_event(input_dev, EV_KEY, KEY_SOUND, 0);
63*4882a593Smuzhiyun input_sync(input_dev);
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun last_event_time = jiffies;
66*4882a593Smuzhiyun had_events = true;
67*4882a593Smuzhiyun }
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun /* Some other devices (Shuttle XS35) use the same WMI GUID for other purposes */
70*4882a593Smuzhiyun static const struct dmi_system_id peaq_dmi_table[] __initconst = {
71*4882a593Smuzhiyun {
72*4882a593Smuzhiyun .matches = {
73*4882a593Smuzhiyun DMI_MATCH(DMI_SYS_VENDOR, "PEAQ"),
74*4882a593Smuzhiyun DMI_MATCH(DMI_PRODUCT_NAME, "PEAQ PMM C1010 MD99187"),
75*4882a593Smuzhiyun },
76*4882a593Smuzhiyun },
77*4882a593Smuzhiyun {}
78*4882a593Smuzhiyun };
79*4882a593Smuzhiyun
peaq_wmi_init(void)80*4882a593Smuzhiyun static int __init peaq_wmi_init(void)
81*4882a593Smuzhiyun {
82*4882a593Smuzhiyun int err;
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun /* WMI GUID is not unique, also check for a DMI match */
85*4882a593Smuzhiyun if (!dmi_check_system(peaq_dmi_table))
86*4882a593Smuzhiyun return -ENODEV;
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun if (!wmi_has_guid(PEAQ_DOLBY_BUTTON_GUID))
89*4882a593Smuzhiyun return -ENODEV;
90*4882a593Smuzhiyun
91*4882a593Smuzhiyun peaq_poll_dev = input_allocate_device();
92*4882a593Smuzhiyun if (!peaq_poll_dev)
93*4882a593Smuzhiyun return -ENOMEM;
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun peaq_poll_dev->name = "PEAQ WMI hotkeys";
96*4882a593Smuzhiyun peaq_poll_dev->phys = "wmi/input0";
97*4882a593Smuzhiyun peaq_poll_dev->id.bustype = BUS_HOST;
98*4882a593Smuzhiyun input_set_capability(peaq_poll_dev, EV_KEY, KEY_SOUND);
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun err = input_setup_polling(peaq_poll_dev, peaq_wmi_poll);
101*4882a593Smuzhiyun if (err)
102*4882a593Smuzhiyun goto err_out;
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun input_set_poll_interval(peaq_poll_dev, PEAQ_POLL_INTERVAL_MS);
105*4882a593Smuzhiyun input_set_max_poll_interval(peaq_poll_dev, PEAQ_POLL_MAX_MS);
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun err = input_register_device(peaq_poll_dev);
108*4882a593Smuzhiyun if (err)
109*4882a593Smuzhiyun goto err_out;
110*4882a593Smuzhiyun
111*4882a593Smuzhiyun return 0;
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun err_out:
114*4882a593Smuzhiyun input_free_device(peaq_poll_dev);
115*4882a593Smuzhiyun return err;
116*4882a593Smuzhiyun }
117*4882a593Smuzhiyun
peaq_wmi_exit(void)118*4882a593Smuzhiyun static void __exit peaq_wmi_exit(void)
119*4882a593Smuzhiyun {
120*4882a593Smuzhiyun input_unregister_device(peaq_poll_dev);
121*4882a593Smuzhiyun }
122*4882a593Smuzhiyun
123*4882a593Smuzhiyun module_init(peaq_wmi_init);
124*4882a593Smuzhiyun module_exit(peaq_wmi_exit);
125*4882a593Smuzhiyun
126*4882a593Smuzhiyun MODULE_DESCRIPTION("PEAQ 2-in-1 WMI hotkey driver");
127*4882a593Smuzhiyun MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
128*4882a593Smuzhiyun MODULE_LICENSE("GPL");
129