Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux-2.6-microblaze.git] / drivers / input / apm-power.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  Input Power Event -> APM Bridge
4  *
5  *  Copyright (c) 2007 Richard Purdie
6  */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/module.h>
11 #include <linux/input.h>
12 #include <linux/slab.h>
13 #include <linux/init.h>
14 #include <linux/tty.h>
15 #include <linux/delay.h>
16 #include <linux/pm.h>
17 #include <linux/apm-emulation.h>
18
19 static void system_power_event(unsigned int keycode)
20 {
21         switch (keycode) {
22         case KEY_SUSPEND:
23                 apm_queue_event(APM_USER_SUSPEND);
24                 pr_info("Requesting system suspend...\n");
25                 break;
26         default:
27                 break;
28         }
29 }
30
31 static void apmpower_event(struct input_handle *handle, unsigned int type,
32                            unsigned int code, int value)
33 {
34         /* only react on key down events */
35         if (value != 1)
36                 return;
37
38         switch (type) {
39         case EV_PWR:
40                 system_power_event(code);
41                 break;
42
43         default:
44                 break;
45         }
46 }
47
48 static int apmpower_connect(struct input_handler *handler,
49                                           struct input_dev *dev,
50                                           const struct input_device_id *id)
51 {
52         struct input_handle *handle;
53         int error;
54
55         handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
56         if (!handle)
57                 return -ENOMEM;
58
59         handle->dev = dev;
60         handle->handler = handler;
61         handle->name = "apm-power";
62
63         error = input_register_handle(handle);
64         if (error) {
65                 pr_err("Failed to register input power handler, error %d\n",
66                        error);
67                 kfree(handle);
68                 return error;
69         }
70
71         error = input_open_device(handle);
72         if (error) {
73                 pr_err("Failed to open input power device, error %d\n", error);
74                 input_unregister_handle(handle);
75                 kfree(handle);
76                 return error;
77         }
78
79         return 0;
80 }
81
82 static void apmpower_disconnect(struct input_handle *handle)
83 {
84         input_close_device(handle);
85         input_unregister_handle(handle);
86         kfree(handle);
87 }
88
89 static const struct input_device_id apmpower_ids[] = {
90         {
91                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
92                 .evbit = { BIT_MASK(EV_PWR) },
93         },
94         { },
95 };
96
97 MODULE_DEVICE_TABLE(input, apmpower_ids);
98
99 static struct input_handler apmpower_handler = {
100         .event =        apmpower_event,
101         .connect =      apmpower_connect,
102         .disconnect =   apmpower_disconnect,
103         .name =         "apm-power",
104         .id_table =     apmpower_ids,
105 };
106
107 static int __init apmpower_init(void)
108 {
109         return input_register_handler(&apmpower_handler);
110 }
111
112 static void __exit apmpower_exit(void)
113 {
114         input_unregister_handler(&apmpower_handler);
115 }
116
117 module_init(apmpower_init);
118 module_exit(apmpower_exit);
119
120 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
121 MODULE_DESCRIPTION("Input Power Event -> APM Bridge");
122 MODULE_LICENSE("GPL");