projects/linux·blob v3.13 · refs

136 lines · 3.3 KiB

1/*
2 * 32bit compatibility wrappers for the input subsystem.
3 *
4 * Very heavily based on evdev.c - Copyright (c) 1999-2002 Vojtech Pavlik
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
9 */
10
11#include <linux/export.h>
12#include <asm/uaccess.h>
13#include "input-compat.h"
14
15#ifdef CONFIG_COMPAT
16
17int input_event_from_user(const char __user *buffer,
18 struct input_event *event)
19{
20 if (INPUT_COMPAT_TEST && !COMPAT_USE_64BIT_TIME) {
21 struct input_event_compat compat_event;
22
23 if (copy_from_user(&compat_event, buffer,
24 sizeof(struct input_event_compat)))
25 return -EFAULT;
26
27 event->time.tv_sec = compat_event.time.tv_sec;
28 event->time.tv_usec = compat_event.time.tv_usec;
29 event->type = compat_event.type;
30 event->code = compat_event.code;
31 event->value = compat_event.value;
32
33 } else {
34 if (copy_from_user(event, buffer, sizeof(struct input_event)))
35 return -EFAULT;
36 }
37
38 return 0;
39}
40
41int input_event_to_user(char __user *buffer,
42 const struct input_event *event)
43{
44 if (INPUT_COMPAT_TEST && !COMPAT_USE_64BIT_TIME) {
45 struct input_event_compat compat_event;
46
47 compat_event.time.tv_sec = event->time.tv_sec;
48 compat_event.time.tv_usec = event->time.tv_usec;
49 compat_event.type = event->type;
50 compat_event.code = event->code;
51 compat_event.value = event->value;
52
53 if (copy_to_user(buffer, &compat_event,
54 sizeof(struct input_event_compat)))
55 return -EFAULT;
56
57 } else {
58 if (copy_to_user(buffer, event, sizeof(struct input_event)))
59 return -EFAULT;
60 }
61
62 return 0;
63}
64
65int input_ff_effect_from_user(const char __user *buffer, size_t size,
66 struct ff_effect *effect)
67{
68 if (INPUT_COMPAT_TEST) {
69 struct ff_effect_compat *compat_effect;
70
71 if (size != sizeof(struct ff_effect_compat))
72 return -EINVAL;
73
74 /*
75 * It so happens that the pointer which needs to be changed
76 * is the last field in the structure, so we can retrieve the
77 * whole thing and replace just the pointer.
78 */
79 compat_effect = (struct ff_effect_compat *)effect;
80
81 if (copy_from_user(compat_effect, buffer,
82 sizeof(struct ff_effect_compat)))
83 return -EFAULT;
84
85 if (compat_effect->type == FF_PERIODIC &&
86 compat_effect->u.periodic.waveform == FF_CUSTOM)
87 effect->u.periodic.custom_data =
88 compat_ptr(compat_effect->u.periodic.custom_data);
89 } else {
90 if (size != sizeof(struct ff_effect))
91 return -EINVAL;
92
93 if (copy_from_user(effect, buffer, sizeof(struct ff_effect)))
94 return -EFAULT;
95 }
96
97 return 0;
98}
99
100#else
101
102int input_event_from_user(const char __user *buffer,
103 struct input_event *event)
104{
105 if (copy_from_user(event, buffer, sizeof(struct input_event)))
106 return -EFAULT;
107
108 return 0;
109}
110
111int input_event_to_user(char __user *buffer,
112 const struct input_event *event)
113{
114 if (copy_to_user(buffer, event, sizeof(struct input_event)))
115 return -EFAULT;
116
117 return 0;
118}
119
120int input_ff_effect_from_user(const char __user *buffer, size_t size,
121 struct ff_effect *effect)
122{
123 if (size != sizeof(struct ff_effect))
124 return -EINVAL;
125
126 if (copy_from_user(effect, buffer, sizeof(struct ff_effect)))
127 return -EFAULT;
128
129 return 0;
130}
131
132#endif /* CONFIG_COMPAT */
133
134EXPORT_SYMBOL_GPL(input_event_from_user);
135EXPORT_SYMBOL_GPL(input_event_to_user);
136EXPORT_SYMBOL_GPL(input_ff_effect_from_user);