mirror of https://gitee.com/openkylin/linux.git
137 lines
3.3 KiB
C
137 lines
3.3 KiB
C
/*
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* 32bit compatibility wrappers for the input subsystem.
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*
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* Very heavily based on evdev.c - Copyright (c) 1999-2002 Vojtech Pavlik
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#include <linux/export.h>
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#include <asm/uaccess.h>
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#include "input-compat.h"
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#ifdef CONFIG_COMPAT
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int input_event_from_user(const char __user *buffer,
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struct input_event *event)
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{
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if (in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
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struct input_event_compat compat_event;
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if (copy_from_user(&compat_event, buffer,
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sizeof(struct input_event_compat)))
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return -EFAULT;
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event->time.tv_sec = compat_event.time.tv_sec;
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event->time.tv_usec = compat_event.time.tv_usec;
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event->type = compat_event.type;
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event->code = compat_event.code;
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event->value = compat_event.value;
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} else {
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if (copy_from_user(event, buffer, sizeof(struct input_event)))
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return -EFAULT;
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}
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return 0;
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}
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int input_event_to_user(char __user *buffer,
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const struct input_event *event)
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{
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if (in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
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struct input_event_compat compat_event;
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compat_event.time.tv_sec = event->time.tv_sec;
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compat_event.time.tv_usec = event->time.tv_usec;
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compat_event.type = event->type;
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compat_event.code = event->code;
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compat_event.value = event->value;
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if (copy_to_user(buffer, &compat_event,
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sizeof(struct input_event_compat)))
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return -EFAULT;
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} else {
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if (copy_to_user(buffer, event, sizeof(struct input_event)))
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return -EFAULT;
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}
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return 0;
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}
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int input_ff_effect_from_user(const char __user *buffer, size_t size,
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struct ff_effect *effect)
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{
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if (in_compat_syscall()) {
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struct ff_effect_compat *compat_effect;
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if (size != sizeof(struct ff_effect_compat))
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return -EINVAL;
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/*
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* It so happens that the pointer which needs to be changed
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* is the last field in the structure, so we can retrieve the
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* whole thing and replace just the pointer.
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*/
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compat_effect = (struct ff_effect_compat *)effect;
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if (copy_from_user(compat_effect, buffer,
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sizeof(struct ff_effect_compat)))
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return -EFAULT;
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if (compat_effect->type == FF_PERIODIC &&
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compat_effect->u.periodic.waveform == FF_CUSTOM)
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effect->u.periodic.custom_data =
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compat_ptr(compat_effect->u.periodic.custom_data);
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} else {
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if (size != sizeof(struct ff_effect))
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return -EINVAL;
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if (copy_from_user(effect, buffer, sizeof(struct ff_effect)))
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return -EFAULT;
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}
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return 0;
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}
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#else
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int input_event_from_user(const char __user *buffer,
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struct input_event *event)
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{
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if (copy_from_user(event, buffer, sizeof(struct input_event)))
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return -EFAULT;
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return 0;
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}
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int input_event_to_user(char __user *buffer,
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const struct input_event *event)
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{
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if (copy_to_user(buffer, event, sizeof(struct input_event)))
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return -EFAULT;
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return 0;
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}
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int input_ff_effect_from_user(const char __user *buffer, size_t size,
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struct ff_effect *effect)
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{
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if (size != sizeof(struct ff_effect))
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return -EINVAL;
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if (copy_from_user(effect, buffer, sizeof(struct ff_effect)))
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return -EFAULT;
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return 0;
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}
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#endif /* CONFIG_COMPAT */
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EXPORT_SYMBOL_GPL(input_event_from_user);
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EXPORT_SYMBOL_GPL(input_event_to_user);
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EXPORT_SYMBOL_GPL(input_ff_effect_from_user);
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