Root/drivers/input/input-compat.c

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);
137

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