path: root/evtest.c

/*
 *  Copyright (c) 1999-2000 Vojtech Pavlik
 *  Copyright (c) 2009-2011 Red Hat, Inc
 */

/**
 * @file
 * Event device test program
 *
 * evtest prints the capabilities on the kernel devices in /dev/input/eventX
 * and their events. Its primary purpose is for kernel or X driver
 * debugging.
 *
 * See INSTALL for installation details or manually compile with
 * gcc -o evtest evtest.c
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 */

#define _GNU_SOURCE /* for asprintf */
#include <stdio.h>
#include <stdint.h>

#include <linux/version.h>
#include <linux/input.h>

#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <errno.h>
#include <getopt.h>
#include <ctype.h>

#define BITS_PER_LONG (sizeof(long) * 8)
#define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
#define OFF(x)  ((x)%BITS_PER_LONG)
#define BIT(x)  (1UL<<OFF(x))
#define LONG(x) ((x)/BITS_PER_LONG)
#define test_bit(bit, array)	((array[LONG(bit)] >> OFF(bit)) & 1)

#define DEV_INPUT_EVENT "/dev/input"
#define EVENT_DEV_NAME "event"

#ifndef EV_SYN
#define EV_SYN 0
#endif
#ifndef SYN_MT_REPORT
#define SYN_MT_REPORT 2
#endif

#define NAME_ELEMENT(element) [element] = #element

enum evtest_mode {
	MODE_CAPTURE,
	MODE_QUERY,
};

static const struct query_mode {
	const char *name;
	int event_type;
	int max;
	int rq;
} query_modes[] = {
	{ "EV_KEY", EV_KEY, KEY_MAX, EVIOCGKEY(KEY_MAX) },
	{ "EV_LED", EV_LED, LED_MAX, EVIOCGLED(LED_MAX) },
	{ "EV_SND", EV_SND, SND_MAX, EVIOCGSND(SND_MAX) },
	{ "EV_SW",  EV_SW, SW_MAX, EVIOCGSW(SW_MAX) },
};

/**
 * Look up an entry in the query_modes table by its textual name. The search
 * is case-insensitive.
 *
 * @param mode The name of the entry to be found.
 *
 * @return The requested query_mode, or NULL if it could not be found.
 */
static const struct query_mode *find_query_mode_by_name(const char *name)
{
	int i;
	for (i = 0; i < sizeof(query_modes) / sizeof(*query_modes); i++) {
		const struct query_mode *mode = &query_modes[i];
		if (strcmp(mode->name, name) == 0)
			return mode;
	}
	return NULL;
}

/**
 * Look up an entry in the query_modes table by value.
 *
 * @param event_type The value of the entry to be found.
 *
 * @return The requested query_mode, or NULL if it could not be found.
 */
static const struct query_mode *find_query_mode_by_value(int event_type)
{
	int i;
	for (i = 0; i < sizeof(query_modes) / sizeof(*query_modes); i++) {
		const struct query_mode *mode = &query_modes[i];
		if (mode->event_type == event_type)
			return mode;
	}
	return NULL;
}

/**
 * Find a query_mode based on a string identifier. The string can either
 * be a numerical value (e.g. "5") or the name of the event type in question
 * (e.g. "EV_SW").
 *
 * @param query_mode The mode to search for
 *
 * @return The requested code's numerical value, or negative on error.
 */
static const struct query_mode *find_query_mode(const char *query_mode)
{
	if (isdigit(query_mode[0])) {
		unsigned long val;
		errno = 0;
		val = strtoul(query_mode, NULL, 0);
		if (errno)
			return NULL;
		return find_query_mode_by_value(val);
	} else {
		return find_query_mode_by_name(query_mode);
	}
}

static const char * const events[EV_MAX + 1] = {
	[0 ... EV_MAX] = NULL,
	NAME_ELEMENT(EV_SYN),			NAME_ELEMENT(EV_KEY),
	NAME_ELEMENT(EV_REL),			NAME_ELEMENT(EV_ABS),
	NAME_ELEMENT(EV_MSC),			NAME_ELEMENT(EV_LED),
	NAME_ELEMENT(EV_SND),			NAME_ELEMENT(EV_REP),
	NAME_ELEMENT(EV_FF),			NAME_ELEMENT(EV_PWR),
	NAME_ELEMENT(EV_FF_STATUS),		NAME_ELEMENT(EV_SW),
};

static const char * const keys[KEY_MAX + 1] = {
	[0 ... KEY_MAX] = NULL,
	NAME_ELEMENT(KEY_RESERVED),		NAME_ELEMENT(KEY_ESC),
	NAME_ELEMENT(KEY_1),			NAME_ELEMENT(KEY_2),
	NAME_ELEMENT(KEY_3),			NAME_ELEMENT(KEY_4),
	NAME_ELEMENT(KEY_5),			NAME_ELEMENT(KEY_6),
	NAME_ELEMENT(KEY_7),			NAME_ELEMENT(KEY_8),
	NAME_ELEMENT(KEY_9),			NAME_ELEMENT(KEY_0),
	NAME_ELEMENT(KEY_MINUS),		NAME_ELEMENT(KEY_EQUAL),
	NAME_ELEMENT(KEY_BACKSPACE),		NAME_ELEMENT(KEY_TAB),
	NAME_ELEMENT(KEY_Q),			NAME_ELEMENT(KEY_W),
	NAME_ELEMENT(KEY_E),			NAME_ELEMENT(KEY_R),
	NAME_ELEMENT(KEY_T),			NAME_ELEMENT(KEY_Y),
	NAME_ELEMENT(KEY_U),			NAME_ELEMENT(KEY_I),
	NAME_ELEMENT(KEY_O),			NAME_ELEMENT(KEY_P),
	NAME_ELEMENT(KEY_LEFTBRACE),		NAME_ELEMENT(KEY_RIGHTBRACE),
	NAME_ELEMENT(KEY_ENTER),		NAME_ELEMENT(KEY_LEFTCTRL),
	NAME_ELEMENT(KEY_A),			NAME_ELEMENT(KEY_S),
	NAME_ELEMENT(KEY_D),			NAME_ELEMENT(KEY_F),
	NAME_ELEMENT(KEY_G),			NAME_ELEMENT(KEY_H),
	NAME_ELEMENT(KEY_J),			NAME_ELEMENT(KEY_K),
	NAME_ELEMENT(KEY_L),			NAME_ELEMENT(KEY_SEMICOLON),
	NAME_ELEMENT(KEY_APOSTROPHE),		NAME_ELEMENT(KEY_GRAVE),
	NAME_ELEMENT(KEY_LEFTSHIFT),		NAME_ELEMENT(KEY_BACKSLASH),
	NAME_ELEMENT(KEY_Z),			NAME_ELEMENT(KEY_X),
	NAME_ELEMENT(KEY_C),			NAME_ELEMENT(KEY_V),
	NAME_ELEMENT(KEY_B),			NAME_ELEMENT(KEY_N),
	NAME_ELEMENT(KEY_M),			NAME_ELEMENT(KEY_COMMA),
	NAME_ELEMENT(KEY_DOT),			NAME_ELEMENT(KEY_SLASH),
	NAME_ELEMENT(KEY_RIGHTSHIFT),		NAME_ELEMENT(KEY_KPASTERISK),
	NAME_ELEMENT(KEY_LEFTALT),		NAME_ELEMENT(KEY_SPACE),
	NAME_ELEMENT(KEY_CAPSLOCK),		NAME_ELEMENT(KEY_F1),
	NAME_ELEMENT(KEY_F2),			NAME_ELEMENT(KEY_F3),
	NAME_ELEMENT(KEY_F4),			NAME_ELEMENT(KEY_F5),
	NAME_ELEMENT(KEY_F6),			NAME_ELEMENT(KEY_F7),
	NAME_ELEMENT(KEY_F8),			NAME_ELEMENT(KEY_F9),
	NAME_ELEMENT(KEY_F10),			NAME_ELEMENT(KEY_NUMLOCK),
	NAME_ELEMENT(KEY_SCROLLLOCK),		NAME_ELEMENT(KEY_KP7),
	NAME_ELEMENT(KEY_KP8),			NAME_ELEMENT(KEY_KP9),
	NAME_ELEMENT(KEY_KPMINUS),		NAME_ELEMENT(KEY_KP4),
	NAME_ELEMENT(KEY_KP5),			NAME_ELEMENT(KEY_KP6),
	NAME_ELEMENT(KEY_KPPLUS),		NAME_ELEMENT(KEY_KP1),
	NAME_ELEMENT(KEY_KP2),			NAME_ELEMENT(KEY_KP3),
	NAME_ELEMENT(KEY_KP0),			NAME_ELEMENT(KEY_KPDOT),
	NAME_ELEMENT(KEY_ZENKAKUHANKAKU), 	NAME_ELEMENT(KEY_102ND),
	NAME_ELEMENT(KEY_F11),			NAME_ELEMENT(KEY_F12),
	NAME_ELEMENT(KEY_RO),			NAME_ELEMENT(KEY_KATAKANA),
	NAME_ELEMENT(KEY_HIRAGANA),		NAME_ELEMENT(KEY_HENKAN),
	NAME_ELEMENT(KEY_KATAKANAHIRAGANA),	NAME_ELEMENT(KEY_MUHENKAN),
	NAME_ELEMENT(KEY_KPJPCOMMA),		NAME_ELEMENT(KEY_KPENTER),
	NAME_ELEMENT(KEY_RIGHTCTRL),		NAME_ELEMENT(KEY_KPSLASH),
	NAME_ELEMENT(KEY_SYSRQ),		NAME_ELEMENT(KEY_RIGHTALT),
	NAME_ELEMENT(KEY_LINEFEED),		NAME_ELEMENT(KEY_HOME),
	NAME_ELEMENT(KEY_UP),			NAME_ELEMENT(KEY_PAGEUP),
	NAME_ELEMENT(KEY_LEFT),			NAME_ELEMENT(KEY_RIGHT),
	NAME_ELEMENT(KEY_END),			NAME_ELEMENT(KEY_DOWN),
	NAME_ELEMENT(KEY_PAGEDOWN),		NAME_ELEMENT(KEY_INSERT),
	NAME_ELEMENT(KEY_DELETE),		NAME_ELEMENT(KEY_MACRO),
	NAME_ELEMENT(KEY_MUTE),			NAME_ELEMENT(KEY_VOLUMEDOWN),
	NAME_ELEMENT(KEY_VOLUMEUP),		NAME_ELEMENT(KEY_POWER),
	NAME_ELEMENT(KEY_KPEQUAL),		NAME_ELEMENT(KEY_KPPLUSMINUS),
	NAME_ELEMENT(KEY_PAUSE),		NAME_ELEMENT(KEY_KPCOMMA),
	NAME_ELEMENT(KEY_HANGUEL),		NAME_ELEMENT(KEY_HANJA),
	NAME_ELEMENT(KEY_YEN),			NAME_ELEMENT(KEY_LEFTMETA),
	NAME_ELEMENT(KEY_RIGHTMETA),		NAME_ELEMENT(KEY_COMPOSE),
	NAME_ELEMENT(KEY_STOP),			NAME_ELEMENT(KEY_AGAIN),
	NAME_ELEMENT(KEY_PROPS),		NAME_ELEMENT(KEY_UNDO),
	NAME_ELEMENT(KEY_FRONT),		NAME_ELEMENT(KEY_COPY),
	NAME_ELEMENT(KEY_OPEN),			NAME_ELEMENT(KEY_PASTE),
	NAME_ELEMENT(KEY_FIND),			NAME_ELEMENT(KEY_CUT),
	NAME_ELEMENT(KEY_HELP),			NAME_ELEMENT(KEY_MENU),
	NAME_ELEMENT(KEY_CALC),			NAME_ELEMENT(KEY_SETUP),
	NAME_ELEMENT(KEY_SLEEP),		NAME_ELEMENT(KEY_WAKEUP),
	NAME_ELEMENT(KEY_FILE),			NAME_ELEMENT(KEY_SENDFILE),
	NAME_ELEMENT(KEY_DELETEFILE),		NAME_ELEMENT(KEY_XFER),
	NAME_ELEMENT(KEY_PROG1),		NAME_ELEMENT(KEY_PROG2),
	NAME_ELEMENT(KEY_WWW),			NAME_ELEMENT(KEY_MSDOS),
	NAME_ELEMENT(KEY_COFFEE),		NAME_ELEMENT(KEY_DIRECTION),
	NAME_ELEMENT(KEY_CYCLEWINDOWS),		NAME_ELEMENT(KEY_MAIL),
	NAME_ELEMENT(KEY_BOOKMARKS),		NAME_ELEMENT(KEY_COMPUTER),
	NAME_ELEMENT(KEY_BACK),			NAME_ELEMENT(KEY_FORWARD),
	NAME_ELEMENT(KEY_CLOSECD),		NAME_ELEMENT(KEY_EJECTCD),
	NAME_ELEMENT(KEY_EJECTCLOSECD),		NAME_ELEMENT(KEY_NEXTSONG),
	NAME_ELEMENT(KEY_PLAYPAUSE),		NAME_ELEMENT(KEY_PREVIOUSSONG),
	NAME_ELEMENT(KEY_STOPCD),		NAME_ELEMENT(KEY_RECORD),
	NAME_ELEMENT(KEY_REWIND),		NAME_ELEMENT(KEY_PHONE),
	NAME_ELEMENT(KEY_ISO),			NAME_ELEMENT(KEY_CONFIG),
	NAME_ELEMENT(KEY_HOMEPAGE),		NAME_ELEMENT(KEY_REFRESH),
	NAME_ELEMENT(KEY_EXIT),			NAME_ELEMENT(KEY_MOVE),
	NAME_ELEMENT(KEY_EDIT),			NAME_ELEMENT(KEY_SCROLLUP),
	NAME_ELEMENT(KEY_SCROLLDOWN),		NAME_ELEMENT(KEY_KPLEFTPAREN),
	NAME_ELEMENT(KEY_KPRIGHTPAREN), 	NAME_ELEMENT(KEY_F13),
	NAME_ELEMENT(KEY_F14),			NAME_ELEMENT(KEY_F15),
	NAME_ELEMENT(KEY_F16),			NAME_ELEMENT(KEY_F17),
	NAME_ELEMENT(KEY_F18),			NAME_ELEMENT(KEY_F19),
	NAME_ELEMENT(KEY_F20),			NAME_ELEMENT(KEY_F21),
	NAME_ELEMENT(KEY_F22),			NAME_ELEMENT(KEY_F23),
	NAME_ELEMENT(KEY_F24),			NAME_ELEMENT(KEY_PLAYCD),
	NAME_ELEMENT(KEY_PAUSECD),		NAME_ELEMENT(KEY_PROG3),
	NAME_ELEMENT(KEY_PROG4),		NAME_ELEMENT(KEY_SUSPEND),
	NAME_ELEMENT(KEY_CLOSE),		NAME_ELEMENT(KEY_PLAY),
	NAME_ELEMENT(KEY_FASTFORWARD),		NAME_ELEMENT(KEY_BASSBOOST),
	NAME_ELEMENT(KEY_PRINT),		NAME_ELEMENT(KEY_HP),
	NAME_ELEMENT(KEY_CAMERA),		NAME_ELEMENT(KEY_SOUND),
	NAME_ELEMENT(KEY_QUESTION),		NAME_ELEMENT(KEY_EMAIL),
	NAME_ELEMENT(KEY_CHAT),			NAME_ELEMENT(KEY_SEARCH),
	NAME_ELEMENT(KEY_CONNECT),		NAME_ELEMENT(KEY_FINANCE),
	NAME_ELEMENT(KEY_SPORT),		NAME_ELEMENT(KEY_SHOP),
	NAME_ELEMENT(KEY_ALTERASE),		NAME_ELEMENT(KEY_CANCEL),
	NAME_ELEMENT(KEY_BRIGHTNESSDOWN),	NAME_ELEMENT(KEY_BRIGHTNESSUP),
	NAME_ELEMENT(KEY_MEDIA),		NAME_ELEMENT(KEY_UNKNOWN),
	NAME_ELEMENT(KEY_OK),
	NAME_ELEMENT(KEY_SELECT),		NAME_ELEMENT(KEY_GOTO),
	NAME_ELEMENT(KEY_CLEAR),		NAME_ELEMENT(KEY_POWER2),
	NAME_ELEMENT(KEY_OPTION),		NAME_ELEMENT(KEY_INFO),
	NAME_ELEMENT(KEY_TIME),			NAME_ELEMENT(KEY_VENDOR),
	NAME_ELEMENT(KEY_ARCHIVE),		NAME_ELEMENT(KEY_PROGRAM),
	NAME_ELEMENT(KEY_CHANNEL),		NAME_ELEMENT(KEY_FAVORITES),
	NAME_ELEMENT(KEY_EPG),			NAME_ELEMENT(KEY_PVR),
	NAME_ELEMENT(KEY_MHP),			NAME_ELEMENT(KEY_LANGUAGE),
	NAME_ELEMENT(KEY_TITLE),		NAME_ELEMENT(KEY_SUBTITLE),
	NAME_ELEMENT(KEY_ANGLE),		NAME_ELEMENT(KEY_ZOOM),
	NAME_ELEMENT(KEY_MODE),			NAME_ELEMENT(KEY_KEYBOARD),
	NAME_ELEMENT(KEY_SCREEN),		NAME_ELEMENT(KEY_PC),
	NAME_ELEMENT(KEY_TV),			NAME_ELEMENT(KEY_TV2),
	NAME_ELEMENT(KEY_VCR),			NAME_ELEMENT(KEY_VCR2),
	NAME_ELEMENT(KEY_SAT),			NAME_ELEMENT(KEY_SAT2),
	NAME_ELEMENT(KEY_CD),			NAME_ELEMENT(KEY_TAPE),
	NAME_ELEMENT(KEY_RADIO),		NAME_ELEMENT(KEY_TUNER),
	NAME_ELEMENT(KEY_PLAYER),		NAME_ELEMENT(KEY_TEXT),
	NAME_ELEMENT(KEY_DVD),			NAME_ELEMENT(KEY_AUX),
	NAME_ELEMENT(KEY_MP3),			NAME_ELEMENT(KEY_AUDIO),
	NAME_ELEMENT(KEY_VIDEO),		NAME_ELEMENT(KEY_DIRECTORY),
	NAME_ELEMENT(KEY_LIST),			NAME_ELEMENT(KEY_MEMO),
	NAME_ELEMENT(KEY_CALENDAR),		NAME_ELEMENT(KEY_RED),
	NAME_ELEMENT(KEY_GREEN),		NAME_ELEMENT(KEY_YELLOW),
	NAME_ELEMENT(KEY_BLUE),			NAME_ELEMENT(KEY_CHANNELUP),
	NAME_ELEMENT(KEY_CHANNELDOWN),		NAME_ELEMENT(KEY_FIRST),
	NAME_ELEMENT(KEY_LAST),			NAME_ELEMENT(KEY_AB),
	NAME_ELEMENT(KEY_NEXT),			NAME_ELEMENT(KEY_RESTART),
	NAME_ELEMENT(KEY_SLOW),			NAME_ELEMENT(KEY_SHUFFLE),
	NAME_ELEMENT(KEY_BREAK),		NAME_ELEMENT(KEY_PREVIOUS),
	NAME_ELEMENT(KEY_DIGITS),		NAME_ELEMENT(KEY_TEEN),
	NAME_ELEMENT(KEY_TWEN),			NAME_ELEMENT(KEY_DEL_EOL),
	NAME_ELEMENT(KEY_DEL_EOS),		NAME_ELEMENT(KEY_INS_LINE),
	NAME_ELEMENT(KEY_DEL_LINE),
	NAME_ELEMENT(KEY_VIDEOPHONE),		NAME_ELEMENT(KEY_GAMES),
	NAME_ELEMENT(KEY_ZOOMIN),		NAME_ELEMENT(KEY_ZOOMOUT),
	NAME_ELEMENT(KEY_ZOOMRESET),		NAME_ELEMENT(KEY_WORDPROCESSOR),
	NAME_ELEMENT(KEY_EDITOR),		NAME_ELEMENT(KEY_SPREADSHEET),
	NAME_ELEMENT(KEY_GRAPHICSEDITOR), 	NAME_ELEMENT(KEY_PRESENTATION),
	NAME_ELEMENT(KEY_DATABASE),		NAME_ELEMENT(KEY_NEWS),
	NAME_ELEMENT(KEY_VOICEMAIL),		NAME_ELEMENT(KEY_ADDRESSBOOK),
	NAME_ELEMENT(KEY_MESSENGER),		NAME_ELEMENT(KEY_DISPLAYTOGGLE),
	NAME_ELEMENT(KEY_SPELLCHECK),		NAME_ELEMENT(KEY_LOGOFF),
	NAME_ELEMENT(KEY_DOLLAR),		NAME_ELEMENT(KEY_EURO),
	NAME_ELEMENT(KEY_FRAMEBACK),	 	NAME_ELEMENT(KEY_FRAMEFORWARD),
	NAME_ELEMENT(KEY_CONTEXT_MENU),		NAME_ELEMENT(KEY_MEDIA_REPEAT),
	NAME_ELEMENT(KEY_DEL_EOL),		NAME_ELEMENT(KEY_DEL_EOS),
	NAME_ELEMENT(KEY_INS_LINE),	 	NAME_ELEMENT(KEY_DEL_LINE),
	NAME_ELEMENT(KEY_FN),			NAME_ELEMENT(KEY_FN_ESC),
	NAME_ELEMENT(KEY_FN_F1),		NAME_ELEMENT(KEY_FN_F2),
	NAME_ELEMENT(KEY_FN_F3),		NAME_ELEMENT(KEY_FN_F4),
	NAME_ELEMENT(KEY_FN_F5),		NAME_ELEMENT(KEY_FN_F6),
	NAME_ELEMENT(KEY_FN_F7),		NAME_ELEMENT(KEY_FN_F8),
	NAME_ELEMENT(KEY_FN_F9),		NAME_ELEMENT(KEY_FN_F10),
	NAME_ELEMENT(KEY_FN_F11),		NAME_ELEMENT(KEY_FN_F12),
	NAME_ELEMENT(KEY_FN_1),			NAME_ELEMENT(KEY_FN_2),
	NAME_ELEMENT(KEY_FN_D),			NAME_ELEMENT(KEY_FN_E),
	NAME_ELEMENT(KEY_FN_F),			NAME_ELEMENT(KEY_FN_S),
	NAME_ELEMENT(KEY_FN_B),
	NAME_ELEMENT(KEY_BRL_DOT1),		NAME_ELEMENT(KEY_BRL_DOT2),
	NAME_ELEMENT(KEY_BRL_DOT3),		NAME_ELEMENT(KEY_BRL_DOT4),
	NAME_ELEMENT(KEY_BRL_DOT5),		NAME_ELEMENT(KEY_BRL_DOT6),
	NAME_ELEMENT(KEY_BRL_DOT7),		NAME_ELEMENT(KEY_BRL_DOT8),
	NAME_ELEMENT(KEY_BRL_DOT9),		NAME_ELEMENT(KEY_BRL_DOT10),
	NAME_ELEMENT(KEY_NUMERIC_0),		NAME_ELEMENT(KEY_NUMERIC_1),
	NAME_ELEMENT(KEY_NUMERIC_2),		NAME_ELEMENT(KEY_NUMERIC_3),
	NAME_ELEMENT(KEY_NUMERIC_4),		NAME_ELEMENT(KEY_NUMERIC_5),
	NAME_ELEMENT(KEY_NUMERIC_6),		NAME_ELEMENT(KEY_NUMERIC_7),
	NAME_ELEMENT(KEY_NUMERIC_8),		NAME_ELEMENT(KEY_NUMERIC_9),
	NAME_ELEMENT(KEY_NUMERIC_STAR),		NAME_ELEMENT(KEY_NUMERIC_POUND),
	NAME_ELEMENT(KEY_BATTERY),
	NAME_ELEMENT(KEY_BLUETOOTH),		NAME_ELEMENT(KEY_BRIGHTNESS_CYCLE),
	NAME_ELEMENT(KEY_BRIGHTNESS_ZERO), 	NAME_ELEMENT(KEY_DASHBOARD),
	NAME_ELEMENT(KEY_DISPLAY_OFF),		NAME_ELEMENT(KEY_DOCUMENTS),
	NAME_ELEMENT(KEY_FORWARDMAIL),		NAME_ELEMENT(KEY_NEW),
	NAME_ELEMENT(KEY_KBDILLUMDOWN),		NAME_ELEMENT(KEY_KBDILLUMUP),
	NAME_ELEMENT(KEY_KBDILLUMTOGGLE), 	NAME_ELEMENT(KEY_REDO),
	NAME_ELEMENT(KEY_REPLY),		NAME_ELEMENT(KEY_SAVE),
	NAME_ELEMENT(KEY_SCALE),		NAME_ELEMENT(KEY_SEND),
	NAME_ELEMENT(KEY_SCREENLOCK),		NAME_ELEMENT(KEY_SWITCHVIDEOMODE),
	NAME_ELEMENT(KEY_UWB),			NAME_ELEMENT(KEY_VIDEO_NEXT),
	NAME_ELEMENT(KEY_VIDEO_PREV),		NAME_ELEMENT(KEY_WIMAX),
	NAME_ELEMENT(KEY_WLAN),
#ifdef KEY_RFKILL
	NAME_ELEMENT(KEY_RFKILL),
#endif
#ifdef KEY_WPS_BUTTON
	NAME_ELEMENT(KEY_WPS_BUTTON),
#endif
#ifdef KEY_TOUCHPAD_TOGGLE
	NAME_ELEMENT(KEY_TOUCHPAD_TOGGLE),
	NAME_ELEMENT(KEY_TOUCHPAD_ON),
	NAME_ELEMENT(KEY_TOUCHPAD_OFF),
#endif

	NAME_ELEMENT(BTN_0),			NAME_ELEMENT(BTN_1),
	NAME_ELEMENT(BTN_2),			NAME_ELEMENT(BTN_3),
	NAME_ELEMENT(BTN_4),			NAME_ELEMENT(BTN_5),
	NAME_ELEMENT(BTN_6),			NAME_ELEMENT(BTN_7),
	NAME_ELEMENT(BTN_8),			NAME_ELEMENT(BTN_9),
	NAME_ELEMENT(BTN_LEFT),			NAME_ELEMENT(BTN_RIGHT),
	NAME_ELEMENT(BTN_MIDDLE),		NAME_ELEMENT(BTN_SIDE),
	NAME_ELEMENT(BTN_EXTRA),		NAME_ELEMENT(BTN_FORWARD),
	NAME_ELEMENT(BTN_BACK),			NAME_ELEMENT(BTN_TASK),
	NAME_ELEMENT(BTN_TRIGGER),		NAME_ELEMENT(BTN_THUMB),
	NAME_ELEMENT(BTN_THUMB2),		NAME_ELEMENT(BTN_TOP),
	NAME_ELEMENT(BTN_TOP2),			NAME_ELEMENT(BTN_PINKIE),
	NAME_ELEMENT(BTN_BASE),			NAME_ELEMENT(BTN_BASE2),
	NAME_ELEMENT(BTN_BASE3),		NAME_ELEMENT(BTN_BASE4),
	NAME_ELEMENT(BTN_BASE5),		NAME_ELEMENT(BTN_BASE6),
	NAME_ELEMENT(BTN_DEAD),			NAME_ELEMENT(BTN_A),
	NAME_ELEMENT(BTN_B),			NAME_ELEMENT(BTN_C),
	NAME_ELEMENT(BTN_X),			NAME_ELEMENT(BTN_Y),
	NAME_ELEMENT(BTN_Z),			NAME_ELEMENT(BTN_TL),
	NAME_ELEMENT(BTN_TR),			NAME_ELEMENT(BTN_TL2),
	NAME_ELEMENT(BTN_TR2),			NAME_ELEMENT(BTN_SELECT),
	NAME_ELEMENT(BTN_START),		NAME_ELEMENT(BTN_MODE),
	NAME_ELEMENT(BTN_THUMBL),		NAME_ELEMENT(BTN_THUMBR),
	NAME_ELEMENT(BTN_TOOL_PEN),		NAME_ELEMENT(BTN_TOOL_RUBBER),
	NAME_ELEMENT(BTN_TOOL_BRUSH),		NAME_ELEMENT(BTN_TOOL_PENCIL),
	NAME_ELEMENT(BTN_TOOL_AIRBRUSH),	NAME_ELEMENT(BTN_TOOL_FINGER),
	NAME_ELEMENT(BTN_TOOL_MOUSE),		NAME_ELEMENT(BTN_TOOL_LENS),
	NAME_ELEMENT(BTN_TOUCH),		NAME_ELEMENT(BTN_STYLUS),
	NAME_ELEMENT(BTN_STYLUS2),		NAME_ELEMENT(BTN_TOOL_DOUBLETAP),
	NAME_ELEMENT(BTN_TOOL_TRIPLETAP), 	NAME_ELEMENT(BTN_TOOL_QUADTAP),
	NAME_ELEMENT(BTN_GEAR_DOWN),
	NAME_ELEMENT(BTN_GEAR_UP),

#ifdef BTN_TRIGGER_HAPPY
	NAME_ELEMENT(BTN_TRIGGER_HAPPY1),	NAME_ELEMENT(BTN_TRIGGER_HAPPY11),
	NAME_ELEMENT(BTN_TRIGGER_HAPPY2),	NAME_ELEMENT(BTN_TRIGGER_HAPPY12),
	NAME_ELEMENT(BTN_TRIGGER_HAPPY3),	NAME_ELEMENT(BTN_TRIGGER_HAPPY13),
	NAME_ELEMENT(BTN_TRIGGER_HAPPY4),	NAME_ELEMENT(BTN_TRIGGER_HAPPY14),
	NAME_ELEMENT(BTN_TRIGGER_HAPPY5),	NAME_ELEMENT(BTN_TRIGGER_HAPPY15),
	NAME_ELEMENT(BTN_TRIGGER_HAPPY6),	NAME_ELEMENT(BTN_TRIGGER_HAPPY16),
	NAME_ELEMENT(BTN_TRIGGER_HAPPY7),	NAME_ELEMENT(BTN_TRIGGER_HAPPY17),
	NAME_ELEMENT(BTN_TRIGGER_HAPPY8),	NAME_ELEMENT(BTN_TRIGGER_HAPPY18),
	NAME_ELEMENT(BTN_TRIGGER_HAPPY9),	NAME_ELEMENT(BTN_TRIGGER_HAPPY19),
	NAME_ELEMENT(BTN_TRIGGER_HAPPY10),	NAME_ELEMENT(BTN_TRIGGER_HAPPY20),

	NAME_ELEMENT(BTN_TRIGGER_HAPPY21),	NAME_ELEMENT(BTN_TRIGGER_HAPPY31),
	NAME_ELEMENT(BTN_TRIGGER_HAPPY22),	NAME_ELEMENT(BTN_TRIGGER_HAPPY32),
	NAME_ELEMENT(BTN_TRIGGER_HAPPY23),	NAME_ELEMENT(BTN_TRIGGER_HAPPY33),
	NAME_ELEMENT(BTN_TRIGGER_HAPPY24),	NAME_ELEMENT(BTN_TRIGGER_HAPPY34),
	NAME_ELEMENT(BTN_TRIGGER_HAPPY25),	NAME_ELEMENT(BTN_TRIGGER_HAPPY35),
	NAME_ELEMENT(BTN_TRIGGER_HAPPY26),	NAME_ELEMENT(BTN_TRIGGER_HAPPY36),
	NAME_ELEMENT(BTN_TRIGGER_HAPPY27),	NAME_ELEMENT(BTN_TRIGGER_HAPPY37),
	NAME_ELEMENT(BTN_TRIGGER_HAPPY28),	NAME_ELEMENT(BTN_TRIGGER_HAPPY38),
	NAME_ELEMENT(BTN_TRIGGER_HAPPY29),	NAME_ELEMENT(BTN_TRIGGER_HAPPY39),
	NAME_ELEMENT(BTN_TRIGGER_HAPPY30),	NAME_ELEMENT(BTN_TRIGGER_HAPPY40),
#endif
};

static const char * const absval[6] = { "Value", "Min  ", "Max  ", "Fuzz ", "Flat ", "Resolution "};

static const char * const relatives[REL_MAX + 1] = {
	[0 ... REL_MAX] = NULL,
	NAME_ELEMENT(REL_X),			NAME_ELEMENT(REL_Y),
	NAME_ELEMENT(REL_Z),			NAME_ELEMENT(REL_RX),
	NAME_ELEMENT(REL_RY),			NAME_ELEMENT(REL_RZ),
	NAME_ELEMENT(REL_HWHEEL),
	NAME_ELEMENT(REL_DIAL),			NAME_ELEMENT(REL_WHEEL),
	NAME_ELEMENT(REL_MISC),
};

static const char * const absolutes[ABS_MAX + 1] = {
	[0 ... ABS_MAX] = NULL,
	NAME_ELEMENT(ABS_X),			NAME_ELEMENT(ABS_Y),
	NAME_ELEMENT(ABS_Z),			NAME_ELEMENT(ABS_RX),
	NAME_ELEMENT(ABS_RY),			NAME_ELEMENT(ABS_RZ),
	NAME_ELEMENT(ABS_THROTTLE),		NAME_ELEMENT(ABS_RUDDER),
	NAME_ELEMENT(ABS_WHEEL),		NAME_ELEMENT(ABS_GAS),
	NAME_ELEMENT(ABS_BRAKE),		NAME_ELEMENT(ABS_HAT0X),
	NAME_ELEMENT(ABS_HAT0Y),		NAME_ELEMENT(ABS_HAT1X),
	NAME_ELEMENT(ABS_HAT1Y),		NAME_ELEMENT(ABS_HAT2X),
	NAME_ELEMENT(ABS_HAT2Y),		NAME_ELEMENT(ABS_HAT3X),
	NAME_ELEMENT(ABS_HAT3Y),		NAME_ELEMENT(ABS_PRESSURE),
	NAME_ELEMENT(ABS_DISTANCE),		NAME_ELEMENT(ABS_TILT_X),
	NAME_ELEMENT(ABS_TILT_Y),		NAME_ELEMENT(ABS_TOOL_WIDTH),
	NAME_ELEMENT(ABS_VOLUME),		NAME_ELEMENT(ABS_MISC),
#ifdef ABS_MT_BLOB_ID
	NAME_ELEMENT(ABS_MT_TOUCH_MAJOR),
	NAME_ELEMENT(ABS_MT_TOUCH_MINOR),
	NAME_ELEMENT(ABS_MT_WIDTH_MAJOR),
	NAME_ELEMENT(ABS_MT_WIDTH_MINOR),
	NAME_ELEMENT(ABS_MT_ORIENTATION),
	NAME_ELEMENT(ABS_MT_POSITION_X),
	NAME_ELEMENT(ABS_MT_POSITION_Y),
	NAME_ELEMENT(ABS_MT_TOOL_TYPE),
	NAME_ELEMENT(ABS_MT_BLOB_ID),
#endif
#ifdef ABS_MT_TRACKING_ID
	NAME_ELEMENT(ABS_MT_TRACKING_ID),
#endif
#ifdef ABS_MT_PRESSURE
	NAME_ELEMENT(ABS_MT_PRESSURE),
#endif
#ifdef ABS_MT_SLOT
	NAME_ELEMENT(ABS_MT_SLOT),
#endif

};

static const char * const misc[MSC_MAX + 1] = {
	[ 0 ... MSC_MAX] = NULL,
	NAME_ELEMENT(MSC_SERIAL),		NAME_ELEMENT(MSC_PULSELED),
	NAME_ELEMENT(MSC_GESTURE),		NAME_ELEMENT(MSC_RAW),
	NAME_ELEMENT(MSC_SCAN),
};

static const char * const leds[LED_MAX + 1] = {
	[0 ... LED_MAX] = NULL,
	NAME_ELEMENT(LED_NUML),			NAME_ELEMENT(LED_CAPSL),
	NAME_ELEMENT(LED_SCROLLL),		NAME_ELEMENT(LED_COMPOSE),
	NAME_ELEMENT(LED_KANA),			NAME_ELEMENT(LED_SLEEP),
	NAME_ELEMENT(LED_SUSPEND),		NAME_ELEMENT(LED_MUTE),
	NAME_ELEMENT(LED_MISC),
};

static const char * const repeats[REP_MAX + 1] = {
	[0 ... REP_MAX] = NULL,
	NAME_ELEMENT(REP_DELAY),		NAME_ELEMENT(REP_PERIOD)
};

static const char * const sounds[SND_MAX + 1] = {
	[0 ... SND_MAX] = NULL,
	NAME_ELEMENT(SND_CLICK),		NAME_ELEMENT(SND_BELL),
	NAME_ELEMENT(SND_TONE)
};

static const char * const syns[3] = {
	NAME_ELEMENT(SYN_REPORT),
	NAME_ELEMENT(SYN_CONFIG),
#ifdef SYN_MT_REPORT
	NAME_ELEMENT(SYN_MT_REPORT)
#endif
};

static const char * const switches[SW_MAX + 1] = {
	[0 ... SW_MAX] = NULL,
	NAME_ELEMENT(SW_LID),
	NAME_ELEMENT(SW_TABLET_MODE),
	NAME_ELEMENT(SW_HEADPHONE_INSERT),
	NAME_ELEMENT(SW_RFKILL_ALL),
	NAME_ELEMENT(SW_MICROPHONE_INSERT),
	NAME_ELEMENT(SW_DOCK),
	NAME_ELEMENT(SW_LINEOUT_INSERT),
	NAME_ELEMENT(SW_JACK_PHYSICAL_INSERT),
#ifdef SW_VIDEOOUT_INSERT
	NAME_ELEMENT(SW_VIDEOOUT_INSERT),
#endif
#ifdef SW_CAMERA_LENS_COVER
	NAME_ELEMENT(SW_CAMERA_LENS_COVER),
	NAME_ELEMENT(SW_KEYPAD_SLIDE),
	NAME_ELEMENT(SW_FRONT_PROXIMITY),
#endif
#ifdef SW_ROTATE_LOCK
	NAME_ELEMENT(SW_ROTATE_LOCK),
#endif
};

static const char * const force[FF_MAX + 1] = {
	[0 ... FF_MAX] = NULL,
	NAME_ELEMENT(FF_RUMBLE),		NAME_ELEMENT(FF_PERIODIC),
	NAME_ELEMENT(FF_CONSTANT),		NAME_ELEMENT(FF_SPRING),
	NAME_ELEMENT(FF_FRICTION),		NAME_ELEMENT(FF_DAMPER),
	NAME_ELEMENT(FF_INERTIA),		NAME_ELEMENT(FF_RAMP),
	NAME_ELEMENT(FF_SQUARE),		NAME_ELEMENT(FF_TRIANGLE),
	NAME_ELEMENT(FF_SINE),			NAME_ELEMENT(FF_SAW_UP),
	NAME_ELEMENT(FF_SAW_DOWN),		NAME_ELEMENT(FF_CUSTOM),
	NAME_ELEMENT(FF_GAIN),			NAME_ELEMENT(FF_AUTOCENTER),
};

static const char * const forcestatus[FF_STATUS_MAX + 1] = {
	[0 ... FF_STATUS_MAX] = NULL,
	NAME_ELEMENT(FF_STATUS_STOPPED),	NAME_ELEMENT(FF_STATUS_PLAYING),
};

static const char * const * const names[EV_MAX + 1] = {
	[0 ... EV_MAX] = NULL,
	[EV_SYN] = events,			[EV_KEY] = keys,
	[EV_REL] = relatives,			[EV_ABS] = absolutes,
	[EV_MSC] = misc,			[EV_LED] = leds,
	[EV_SND] = sounds,			[EV_REP] = repeats,
	[EV_SW] = switches,
	[EV_FF] = force,			[EV_FF_STATUS] = forcestatus,
};

/**
 * Convert a string to a specific key/snd/led/sw code. The string can either
 * be the name of the key in question (e.g. "SW_DOCK") or the numerical
 * value, either as decimal (e.g. "5") or as hex (e.g. "0x5").
 *
 * @param mode The mode being queried (key, snd, led, sw)
 * @param kstr The string to parse and convert
 *
 * @return The requested code's numerical value, or negative on error.
 */
static int get_keycode(const struct query_mode *query_mode, const char *kstr)
{
	if (isdigit(kstr[0])) {
		unsigned long val;
		errno = 0;
		val = strtoul(kstr, NULL, 0);
		if (errno) {
			fprintf(stderr, "Could not interpret value %s\n", kstr);
			return -1;
		}
		return (int) val;
	} else {
		const char * const *keynames = names[query_mode->event_type];
		int i;

		for (i = 0; i < query_mode->max; i++) {
			const char *name = keynames[i];
			if (name && strcmp(name, kstr) == 0)
				return i;
		}

		return -1;
	}
}

/**
 * Filter for the AutoDevProbe scandir on /dev/input.
 *
 * @param dir The current directory entry provided by scandir.
 *
 * @return Non-zero if the given directory entry starts with "event", or zero
 * otherwise.
 */
static int is_event_device(const struct dirent *dir) {
	return strncmp(EVENT_DEV_NAME, dir->d_name, 5) == 0;
}

/**
 * Scans all /dev/input/event*, display them and ask the user which one to
 * open.
 *
 * @return The event device file name of the device file selected. This
 * string is allocated and must be freed by the caller.
 */
static char* scan_devices(void)
{
	struct dirent **namelist;
	int i, ndev, devnum;
	char *filename;

	ndev = scandir(DEV_INPUT_EVENT, &namelist, is_event_device, alphasort);
	if (ndev <= 0)
		return NULL;

	fprintf(stderr, "Available devices:\n");

	for (i = 0; i < ndev; i++)
	{
		char fname[64];
		int fd = -1;
		char name[256] = "???";

		snprintf(fname, sizeof(fname),
			 "%s/%s", DEV_INPUT_EVENT, namelist[i]->d_name);
		fd = open(fname, O_RDONLY);
		if (fd < 0)
			continue;
		ioctl(fd, EVIOCGNAME(sizeof(name)), name);

		fprintf(stderr, "%s:	%s\n", fname, name);
		close(fd);
		free(namelist[i]);
	}

	fprintf(stderr, "Select the device event number [0-%d]: ", ndev - 1);
	scanf("%d", &devnum);

	if (devnum >= ndev || devnum < 0)
		return NULL;

	asprintf(&filename, "%s/%s%d",
		 DEV_INPUT_EVENT, EVENT_DEV_NAME,
		 devnum);

	return filename;
}

/**
 * Print usage information.
 */
static int usage(void)
{
	printf("USAGE:\n");
	printf(" Grab mode:\n");
	printf("   %s /dev/input/eventX\n", program_invocation_short_name);
	printf("\n");
	printf(" Query mode: (check exit code)\n");
	printf("   %s --query /dev/input/eventX <type> <value>\n",
		program_invocation_short_name);

	printf("\n");
	printf("<type> is one of: EV_KEY, EV_SW, EV_LED, EV_SND\n");
	printf("<value> can either be a numerical value, or the textual name of the\n");
	printf("key/switch/LED/sound being queried (e.g. SW_DOCK).\n");

	return EXIT_FAILURE;
}

/**
 * Print additional information for absolute axes (min/max, current value,
 * etc.).
 *
 * @param fd The file descriptor to the device.
 * @param axis The axis identifier (e.g. ABS_X).
 */
static void print_absdata(int fd, int axis)
{
	int abs[6] = {0};
	int k;

	ioctl(fd, EVIOCGABS(axis), abs);
	for (k = 0; k < 6; k++)
		if ((k < 3) || abs[k])
			printf("      %s %6d\n", absval[k], abs[k]);
}

/**
 * Print static device information (no events). This information includes
 * version numbers, device name and all bits supported by this device.
 *
 * @param fd The file descriptor to the device.
 * @return 0 on success or 1 otherwise.
 */
static int print_device_info(int fd)
{
	int i, j;
	int version;
	unsigned short id[4];
	char name[256] = "Unknown";
	unsigned long bit[EV_MAX][NBITS(KEY_MAX)];

	if (ioctl(fd, EVIOCGVERSION, &version)) {
		perror("evtest: can't get version");
		return 1;
	}

	printf("Input driver version is %d.%d.%d\n",
		version >> 16, (version >> 8) & 0xff, version & 0xff);

	ioctl(fd, EVIOCGID, id);
	printf("Input device ID: bus 0x%x vendor 0x%x product 0x%x version 0x%x\n",
		id[ID_BUS], id[ID_VENDOR], id[ID_PRODUCT], id[ID_VERSION]);

	ioctl(fd, EVIOCGNAME(sizeof(name)), name);
	printf("Input device name: \"%s\"\n", name);

	memset(bit, 0, sizeof(bit));
	ioctl(fd, EVIOCGBIT(0, EV_MAX), bit[0]);
	printf("Supported events:\n");

	for (i = 0; i < EV_MAX; i++)
		if (test_bit(i, bit[0])) {
			printf("  Event type %d (%s)\n", i, events[i] ? events[i] : "?");
			if (!i) continue;
			ioctl(fd, EVIOCGBIT(i, KEY_MAX), bit[i]);
			for (j = 0; j < KEY_MAX; j++)
				if (test_bit(j, bit[i])) {
					printf("    Event code %d (%s)\n", j, names[i] ? (names[i][j] ? names[i][j] : "?") : "?");
					if (i == EV_ABS)
						print_absdata(fd, j);
				}
		}

	return 0;
}

/**
 * Print device events as they come in.
 *
 * @param fd The file descriptor to the device.
 * @return 0 on success or 1 otherwise.
 */
static int print_events(int fd)
{
	struct input_event ev[64];
	int i, rd;

	while (1) {
		rd = read(fd, ev, sizeof(struct input_event) * 64);

		if (rd < (int) sizeof(struct input_event)) {
			printf("expected %d bytes, got %d\n", (int) sizeof(struct input_event), rd);
			perror("\nevtest: error reading");
			return 1;
		}

		for (i = 0; i < rd / sizeof(struct input_event); i++) {
			printf("Event: time %ld.%06ld, ", ev[i].time.tv_sec, ev[i].time.tv_usec);

			if (ev[i].type == EV_SYN) {
				if (ev[i].code == SYN_MT_REPORT)
					printf("++++++++++++++ %s ++++++++++++\n", syns[ev[i].code]);
				else
					printf("-------------- %s ------------\n", syns[ev[i].code]);
			} else {
				printf("type %d (%s), code %d (%s), ",
					ev[i].type,
					events[ev[i].type] ? events[ev[i].type] : "?",
					ev[i].code,
					names[ev[i].type] ? (names[ev[i].type][ev[i].code] ? names[ev[i].type][ev[i].code] : "?") : "?");
				if (ev[i].type == EV_MSC && (ev[i].code == MSC_RAW || ev[i].code == MSC_SCAN))
					printf("value %02x\n", ev[i].value);
				else
					printf("value %d\n", ev[i].value);
			}
		}

	}
}

/**
 * Grab and immediately ungrab the device.
 *
 * @param fd The file descriptor to the device.
 * @return 0 if the grab was successful, or 1 otherwise.
 */
static int test_grab(int fd)
{
	int rc;

	rc = ioctl(fd, EVIOCGRAB, (void*)1);

	if (!rc)
		ioctl(fd, EVIOCGRAB, (void*)0);

	return rc;
}

/**
 * Enter capture mode. The requested event device will be monitored, and any
 * captured events will be decoded and printed on the console.
 *
 * @param device The device to monitor, or NULL if the user should be prompted.
 * @return 0 on success, non-zero on error.
 */
static int do_capture(const char *device)
{
	int fd;
	char *filename;

	if (!device) {
		fprintf(stderr, "No device specified, trying to scan all of %s/%s*\n",
			DEV_INPUT_EVENT, EVENT_DEV_NAME);

		if (getuid() != 0)
			fprintf(stderr, "Not running as root, no devices may be available.\n");

		filename = scan_devices();
		if (!filename)
			return usage();
	} else
		filename = strdup(device);

	if (!filename)
		return EXIT_FAILURE;

	if ((fd = open(filename, O_RDONLY)) < 0) {
		perror("evtest");
		if (errno == EACCES && getuid() != 0)
			fprintf(stderr, "You do not have access to %s. Try "
					"running as root instead.\n",
					filename);
		return EXIT_FAILURE;
	}

	free(filename);

	if (!isatty(fileno(stdout)))
		setbuf(stdout, NULL);

	if (print_device_info(fd))
		return EXIT_FAILURE;

	printf("Testing ... (interrupt to exit)\n");

	if (test_grab(fd))
	{
		printf("***********************************************\n");
		printf("  This device is grabbed by another process.\n");
		printf("  No events are available to evtest while the\n"
		       "  other grab is active.\n");
		printf("  In most cases, this is caused by an X driver,\n"
		       "  try VT-switching and re-run evtest again.\n");
		printf("***********************************************\n");
	}

	return print_events(fd);
}

/**
 * Perform a one-shot state query on a specific device. The query can be of
 * any known mode, on any valid keycode.
 *
 * @param device Path to the evdev device node that should be queried.
 * @param query_mode The event type that is being queried (e.g. key, switch)
 * @param keycode The code of the key/switch/sound/LED to be queried
 * @return 0 if the state bit is unset, 10 if the state bit is set, 1 on error.
 */
static int query_device(const char *device, const struct query_mode *query_mode, int keycode)
{
	int fd;
	int r;
	unsigned long state[NBITS(query_mode->max)];

	fd = open(device, O_RDONLY);
	if (fd < 0) {
		perror("open");
		return EXIT_FAILURE;
	}
	memset(state, 0, sizeof(state));
	r = ioctl(fd, query_mode->rq, state);
	close(fd);

	if (r == -1) {
		perror("ioctl");
		return EXIT_FAILURE;
	}

	if (test_bit(keycode, state))
		return 10; /* different from EXIT_FAILURE */
	else
		return 0;
}

/**
 * Enter query mode. The requested event device will be queried for the state
 * of a particular switch/key/sound/LED.
 *
 * @param device The device to query.
 * @param mode The mode (event type) that is to be queried (snd, sw, key, led)
 * @param keycode The key code to query the state of.
 * @return 0 if the state bit is unset, 10 if the state bit is set.
 */
static int do_query(const char *device, const char *event_type, const char *keyname)
{
	const struct query_mode *query_mode;
	int keycode;

	if (!device) {
		fprintf(stderr, "Device argument is required for query.\n");
		return usage();
	}

	query_mode = find_query_mode(event_type);
	if (!query_mode) {
		fprintf(stderr, "Unrecognised event type: %s\n", event_type);
		return usage();
	}

	keycode = get_keycode(query_mode, keyname);
	if (keycode < 0) {
		fprintf(stderr, "Unrecognised key name: %s\n", keyname);
		return usage();
	} else if (keycode > query_mode->max) {
		fprintf(stderr, "Key %d is out of bounds.\n", keycode);
		return EXIT_FAILURE;
	}

	return query_device(device, query_mode, keycode);
}

static const struct option long_options[] = {
	{ "query", no_argument, NULL, MODE_QUERY },
	{ 0, },
};

int main (int argc, char **argv)
{
	const char *device = NULL;
	const char *keyname;
	const char *event_type;
	enum evtest_mode mode = MODE_CAPTURE;

	while (1) {
		int option_index = 0;
		int c = getopt_long(argc, argv, "", long_options, &option_index);
		if (c == -1)
			break;
		switch (c) {
		case MODE_QUERY:
			mode = c;
			break;
		default:
			return usage();
		}
	}

	if (optind < argc)
		device = argv[optind++];

	if (mode == MODE_CAPTURE)
		return do_capture(device);

	if ((argc - optind) < 2) {
		fprintf(stderr, "Query mode requires device, type and key parameters\n");
		return usage();
	}

	event_type = argv[optind++];
	keyname = argv[optind++];
	return do_query(device, event_type, keyname);
}

/* vim: set noexpandtab tabstop=8 shiftwidth=8: */