Root/drivers/input/apm-power.c

1/*
2 * Input Power Event -> APM Bridge
3 *
4 * Copyright (c) 2007 Richard Purdie
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 */
11
12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include <linux/module.h>
15#include <linux/input.h>
16#include <linux/slab.h>
17#include <linux/init.h>
18#include <linux/tty.h>
19#include <linux/delay.h>
20#include <linux/pm.h>
21#include <linux/apm-emulation.h>
22
23static void system_power_event(unsigned int keycode)
24{
25    switch (keycode) {
26    case KEY_SUSPEND:
27        apm_queue_event(APM_USER_SUSPEND);
28        pr_info("Requesting system suspend...\n");
29        break;
30    default:
31        break;
32    }
33}
34
35static void apmpower_event(struct input_handle *handle, unsigned int type,
36               unsigned int code, int value)
37{
38    /* only react on key down events */
39    if (value != 1)
40        return;
41
42    switch (type) {
43    case EV_PWR:
44        system_power_event(code);
45        break;
46
47    default:
48        break;
49    }
50}
51
52static int apmpower_connect(struct input_handler *handler,
53                      struct input_dev *dev,
54                      const struct input_device_id *id)
55{
56    struct input_handle *handle;
57    int error;
58
59    handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
60    if (!handle)
61        return -ENOMEM;
62
63    handle->dev = dev;
64    handle->handler = handler;
65    handle->name = "apm-power";
66
67    error = input_register_handle(handle);
68    if (error) {
69        pr_err("Failed to register input power handler, error %d\n",
70               error);
71        kfree(handle);
72        return error;
73    }
74
75    error = input_open_device(handle);
76    if (error) {
77        pr_err("Failed to open input power device, error %d\n", error);
78        input_unregister_handle(handle);
79        kfree(handle);
80        return error;
81    }
82
83    return 0;
84}
85
86static void apmpower_disconnect(struct input_handle *handle)
87{
88    input_close_device(handle);
89    input_unregister_handle(handle);
90    kfree(handle);
91}
92
93static const struct input_device_id apmpower_ids[] = {
94    {
95        .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
96        .evbit = { BIT_MASK(EV_PWR) },
97    },
98    { },
99};
100
101MODULE_DEVICE_TABLE(input, apmpower_ids);
102
103static struct input_handler apmpower_handler = {
104    .event = apmpower_event,
105    .connect = apmpower_connect,
106    .disconnect = apmpower_disconnect,
107    .name = "apm-power",
108    .id_table = apmpower_ids,
109};
110
111static int __init apmpower_init(void)
112{
113    return input_register_handler(&apmpower_handler);
114}
115
116static void __exit apmpower_exit(void)
117{
118    input_unregister_handler(&apmpower_handler);
119}
120
121module_init(apmpower_init);
122module_exit(apmpower_exit);
123
124MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
125MODULE_DESCRIPTION("Input Power Event -> APM Bridge");
126MODULE_LICENSE("GPL");
127

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