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