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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 | |
17 | int 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 | |
41 | int 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 | |
65 | int 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 | |
102 | int 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 | |
111 | int 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 | |
120 | int 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 | |
134 | EXPORT_SYMBOL_GPL(input_event_from_user); |
135 | EXPORT_SYMBOL_GPL(input_event_to_user); |
136 | EXPORT_SYMBOL_GPL(input_ff_effect_from_user); |
137 |
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