Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 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 | |
Paul Gortmaker | 15d0580 | 2011-10-25 14:51:47 -0400 | [diff] [blame] | 11 | #include <linux/export.h> |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 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) { |
| 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) { |
| 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); |