// SPDX-License-Identifier: GPL-2.0-only/* * 32bit compatibility wrappers for the input subsystem. * * Very heavily based on evdev.c - Copyright (c) 1999-2002 Vojtech Pavlik */ #include <linux/export.h>#include <linux/uaccess.h>#include "input-compat.h" #ifdef CONFIG_COMPAT int input_event_from_user(const char __user *buffer,			  struct input_event *event){	if (in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {		struct input_event_compat compat_event; 		if (copy_from_user(&compat_event, buffer,				   sizeof(struct input_event_compat)))			return -EFAULT; 		event->input_event_sec = compat_event.sec;		event->input_event_usec = compat_event.usec;		event->type = compat_event.type;		event->code = compat_event.code;		event->value = compat_event.value; 	} else {		if (copy_from_user(event, buffer, sizeof(struct input_event)))			return -EFAULT;	} 	return 0;} int input_event_to_user(char __user *buffer,			const struct input_event *event){	if (in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {		struct input_event_compat compat_event; 		compat_event.sec = event->input_event_sec;		compat_event.usec = event->input_event_usec;		compat_event.type = event->type;		compat_event.code = event->code;		compat_event.value = event->value; 		if (copy_to_user(buffer, &compat_event,				 sizeof(struct input_event_compat)))			return -EFAULT; 	} else {		if (copy_to_user(buffer, event, sizeof(struct input_event)))			return -EFAULT;	} 	return 0;} int input_ff_effect_from_user(const char __user *buffer, size_t size,			      struct ff_effect *effect){	if (in_compat_syscall()) {		struct ff_effect_compat *compat_effect; 		if (size != sizeof(struct ff_effect_compat))			return -EINVAL; 		/*		 * It so happens that the pointer which needs to be changed		 * is the last field in the structure, so we can retrieve the		 * whole thing and replace just the pointer.		 */		compat_effect = (struct ff_effect_compat *)effect; 		if (copy_from_user(compat_effect, buffer,				   sizeof(struct ff_effect_compat)))			return -EFAULT; 		if (compat_effect->type == FF_PERIODIC &&		    compat_effect->u.periodic.waveform == FF_CUSTOM)			effect->u.periodic.custom_data =				compat_ptr(compat_effect->u.periodic.custom_data);	} else {		if (size != sizeof(struct ff_effect))			return -EINVAL; 		if (copy_from_user(effect, buffer, sizeof(struct ff_effect)))			return -EFAULT;	} 	return 0;} #else int input_event_from_user(const char __user *buffer,			 struct input_event *event){	if (copy_from_user(event, buffer, sizeof(struct input_event)))		return -EFAULT; 	return 0;} int input_event_to_user(char __user *buffer,			const struct input_event *event){	if (copy_to_user(buffer, event, sizeof(struct input_event)))		return -EFAULT; 	return 0;} int input_ff_effect_from_user(const char __user *buffer, size_t size,			      struct ff_effect *effect){	if (size != sizeof(struct ff_effect))		return -EINVAL; 	if (copy_from_user(effect, buffer, sizeof(struct ff_effect)))		return -EFAULT; 	return 0;} #endif /* CONFIG_COMPAT */ EXPORT_SYMBOL_GPL(input_event_from_user);EXPORT_SYMBOL_GPL(input_event_to_user);EXPORT_SYMBOL_GPL(input_ff_effect_from_user);