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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/drivers/input/input-compat.h
15109 views
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#ifndef _INPUT_COMPAT_H

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#define _INPUT_COMPAT_H

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/*

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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/compiler.h>

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#include <linux/compat.h>

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#include <linux/input.h>

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#ifdef CONFIG_COMPAT

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/* Note to the author of this code: did it ever occur to

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   you why the ifdefs are needed? Think about it again. -AK */

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#if defined(CONFIG_X86_64) || defined(CONFIG_TILE)

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#  define INPUT_COMPAT_TEST is_compat_task()

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#elif defined(CONFIG_S390)

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#  define INPUT_COMPAT_TEST test_thread_flag(TIF_31BIT)

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#elif defined(CONFIG_MIPS)

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#  define INPUT_COMPAT_TEST test_thread_flag(TIF_32BIT_ADDR)

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#else

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#  define INPUT_COMPAT_TEST test_thread_flag(TIF_32BIT)

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#endif

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struct input_event_compat {

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	struct compat_timeval time;

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	__u16 type;

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	__u16 code;

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	__s32 value;

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};

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struct ff_periodic_effect_compat {

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	__u16 waveform;

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	__u16 period;

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	__s16 magnitude;

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	__s16 offset;

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	__u16 phase;

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	struct ff_envelope envelope;

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	__u32 custom_len;

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	compat_uptr_t custom_data;

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};

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struct ff_effect_compat {

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	__u16 type;

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	__s16 id;

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	__u16 direction;

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	struct ff_trigger trigger;

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	struct ff_replay replay;

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	union {

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		struct ff_constant_effect constant;

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		struct ff_ramp_effect ramp;

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		struct ff_periodic_effect_compat periodic;

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		struct ff_condition_effect condition[2]; /* One for each axis */

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		struct ff_rumble_effect rumble;

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	} u;

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};

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static inline size_t input_event_size(void)

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{

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	return INPUT_COMPAT_TEST ?

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		sizeof(struct input_event_compat) : sizeof(struct input_event);

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}

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#else

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static inline size_t input_event_size(void)

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{

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	return sizeof(struct input_event);

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}

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#endif /* 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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int input_event_to_user(char __user *buffer,

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			const struct input_event *event);

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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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#endif /* _INPUT_COMPAT_H */

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