projects/linux·blob v3.0 · refs

135 lines · 3.2 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 <asm/uaccess.h>
12#include "input-compat.h"
13
14#ifdef CONFIG_COMPAT
15
16int input_event_from_user(const char __user *buffer,
17 struct input_event *event)
18{
19 if (INPUT_COMPAT_TEST) {
20 struct input_event_compat compat_event;
21
22 if (copy_from_user(&compat_event, buffer,
23 sizeof(struct input_event_compat)))
24 return -EFAULT;
25
26 event->time.tv_sec = compat_event.time.tv_sec;
27 event->time.tv_usec = compat_event.time.tv_usec;
28 event->type = compat_event.type;
29 event->code = compat_event.code;
30 event->value = compat_event.value;
31
32 } else {
33 if (copy_from_user(event, buffer, sizeof(struct input_event)))
34 return -EFAULT;
35 }
36
37 return 0;
38}
39
40int input_event_to_user(char __user *buffer,
41 const struct input_event *event)
42{
43 if (INPUT_COMPAT_TEST) {
44 struct input_event_compat compat_event;
45
46 compat_event.time.tv_sec = event->time.tv_sec;
47 compat_event.time.tv_usec = event->time.tv_usec;
48 compat_event.type = event->type;
49 compat_event.code = event->code;
50 compat_event.value = event->value;
51
52 if (copy_to_user(buffer, &compat_event,
53 sizeof(struct input_event_compat)))
54 return -EFAULT;
55
56 } else {
57 if (copy_to_user(buffer, event, sizeof(struct input_event)))
58 return -EFAULT;
59 }
60
61 return 0;
62}
63
64int input_ff_effect_from_user(const char __user *buffer, size_t size,
65 struct ff_effect *effect)
66{
67 if (INPUT_COMPAT_TEST) {
68 struct ff_effect_compat *compat_effect;
69
70 if (size != sizeof(struct ff_effect_compat))
71 return -EINVAL;
72
73 /*
74 * It so happens that the pointer which needs to be changed
75 * is the last field in the structure, so we can retrieve the
76 * whole thing and replace just the pointer.
77 */
78 compat_effect = (struct ff_effect_compat *)effect;
79
80 if (copy_from_user(compat_effect, buffer,
81 sizeof(struct ff_effect_compat)))
82 return -EFAULT;
83
84 if (compat_effect->type == FF_PERIODIC &&
85 compat_effect->u.periodic.waveform == FF_CUSTOM)
86 effect->u.periodic.custom_data =
87 compat_ptr(compat_effect->u.periodic.custom_data);
88 } else {
89 if (size != sizeof(struct ff_effect))
90 return -EINVAL;
91
92 if (copy_from_user(effect, buffer, sizeof(struct ff_effect)))
93 return -EFAULT;
94 }
95
96 return 0;
97}
98
99#else
100
101int input_event_from_user(const char __user *buffer,
102 struct input_event *event)
103{
104 if (copy_from_user(event, buffer, sizeof(struct input_event)))
105 return -EFAULT;
106
107 return 0;
108}
109
110int input_event_to_user(char __user *buffer,
111 const struct input_event *event)
112{
113 if (copy_to_user(buffer, event, sizeof(struct input_event)))
114 return -EFAULT;
115
116 return 0;
117}
118
119int input_ff_effect_from_user(const char __user *buffer, size_t size,
120 struct ff_effect *effect)
121{
122 if (size != sizeof(struct ff_effect))
123 return -EINVAL;
124
125 if (copy_from_user(effect, buffer, sizeof(struct ff_effect)))
126 return -EFAULT;
127
128 return 0;
129}
130
131#endif /* CONFIG_COMPAT */
132
133EXPORT_SYMBOL_GPL(input_event_from_user);
134EXPORT_SYMBOL_GPL(input_event_to_user);
135EXPORT_SYMBOL_GPL(input_ff_effect_from_user);