Blame input_layer.c

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/*
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 *  input_layer - Kernel ACPI Event Input Layer Interface
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 *
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 *  Handles the details of getting kernel ACPI events from the input
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 *  layer (/dev/input/event*).
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 *
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 *  Inspired by (and in some cases blatantly lifted from) Vojtech Pavlik's
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 *  evtest.c.
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 *
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 *  Copyright (C) 2008-2009, Ted Felix (www.tedfelix.com)
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 *
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 *  This program is free software; you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation; either version 2 of the License, or
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 *  (at your option) any later version.
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 *
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program; if not, write to the Free Software
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 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 *  (tabs at 4)
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 */
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/* system */
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <linux/input.h>
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#include <string.h>
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#include <errno.h>
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#include <malloc.h>
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#include <glob.h>
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/* local */
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#include "acpid.h"
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#include "log.h"
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#include "connection_list.h"
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#include "event.h"
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#include "libc_compat.h"
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#include "input_layer.h"
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#define DIM(a)  (sizeof(a) / sizeof(a[0]))
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struct evtab_entry {
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	struct input_event event;
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	const char *str;
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};
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/* Event Table: Events we are interested in and their strings.  Use 
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   evtest.c, acpi_genl, or kacpimon to find new events to add to this
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   table. */
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/*
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 * The two numbers (e.g. "00000080 00000000") in each string is a format
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 * that Xorg and maybe others expect.
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 *
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 * See hw/xfree86/os-support/linux/lnx_acpi.c in xserver and specifically
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 * lnxACPIGetEventFromOs().
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 */
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static struct evtab_entry evtab[] = {
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	/*** COMMON EVENTS ***/
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	{{{0,0}, EV_KEY, KEY_POWER, 1}, "button/power PBTN 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_SUSPEND, 1}, 
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 		"button/suspend SUSP 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_SLEEP, 1}, "button/sleep SBTN 00000080 00000000"},
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	{{{0,0}, EV_SW, SW_LID, 1}, "button/lid LID close"},
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	{{{0,0}, EV_SW, SW_LID, 0}, "button/lid LID open"},
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	{{{0,0}, EV_SW, SW_TABLET_MODE, 0}, "video/tabletmode TBLT 0000008A 00000000"},
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	{{{0,0}, EV_SW, SW_TABLET_MODE, 1}, "video/tabletmode TBLT 0000008A 00000001"},
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	/*** VIDEO ***/
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	{{{0,0}, EV_KEY, KEY_ZOOM, 1}, "button/zoom ZOOM 00000080 00000000"},
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	/* typical events file has "video.* 00000087" */
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	{{{0,0}, EV_KEY, KEY_BRIGHTNESSDOWN, 1},
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 		"video/brightnessdown BRTDN 00000087 00000000"},
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 	/* typical events file has "video.* 00000086" */
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	{{{0,0}, EV_KEY, KEY_BRIGHTNESSUP, 1},
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 		"video/brightnessup BRTUP 00000086 00000000"},
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 	/* additional events divined from the kernel's video.c */
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	{{{0,0}, EV_KEY, KEY_VIDEO_NEXT, 1},
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 		"video/next NEXT 00000083 00000000"},
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	{{{0,0}, EV_KEY, KEY_VIDEO_PREV, 1},
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 		"video/prev PREV 00000084 00000000"},
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	{{{0,0}, EV_KEY, KEY_BRIGHTNESS_CYCLE, 1},
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 		"video/brightnesscycle BCYC 00000085 00000000"},
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	{{{0,0}, EV_KEY, KEY_BRIGHTNESS_ZERO, 1},
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 		"video/brightnesszero BZRO 00000088 00000000"},
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	{{{0,0}, EV_KEY, KEY_DISPLAY_OFF, 1},
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			"video/displayoff DOFF 00000089 00000000"},
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	/* procfs on Thinkpad 600X reports "video VID0 00000080 00000000" */
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	/* typical events file has "video.* 00000080" */
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	{{{0,0}, EV_KEY, KEY_SWITCHVIDEOMODE, 1},
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		"video/switchmode VMOD 00000080 00000000"},
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 	/*** AUDIO ***/
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 	{{{0,0}, EV_KEY, KEY_VOLUMEDOWN, 1},
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 		"button/volumedown VOLDN 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_VOLUMEDOWN, 2},
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		"button/volumedown VOLDN 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_VOLUMEUP, 1},
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		"button/volumeup VOLUP 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_VOLUMEUP, 2},
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 		"button/volumeup VOLUP 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_MUTE, 1},
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 		"button/mute MUTE 00000080 00000000"},
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/* Kernel 3.1 or later required for KEY_MICMUTE */
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#ifdef KEY_MICMUTE
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	{{{0,0}, EV_KEY, KEY_MICMUTE, 1},
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		"button/micmute MICMUTE 00000080 00000000"},
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#endif
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 	/* cd play/pause buttons */
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 	{{{0,0}, EV_KEY, KEY_NEXTSONG, 1},
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 		"cd/next CDNEXT 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_PREVIOUSSONG, 1},
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 		"cd/prev CDPREV 00000080 00000000"},
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 	{{{0,0}, EV_KEY, KEY_PLAYPAUSE, 1},
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 		"cd/play CDPLAY 00000080 00000000"},
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 	{{{0,0}, EV_KEY, KEY_STOPCD, 1},
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 		"cd/stop CDSTOP 00000080 00000000"},
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	/*** JACKS ***/
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/* This test probably belongs in configure.ac. */
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#ifdef SW_HEADPHONE_INSERT
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 #ifndef SW_LINEIN_INSERT
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  #define SW_LINEIN_INSERT 0x0d
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 #endif
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	{{{0,0}, EV_SW, SW_HEADPHONE_INSERT, 0},
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		"jack/headphone HEADPHONE unplug"},
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	{{{0,0}, EV_SW, SW_HEADPHONE_INSERT, 1},
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		"jack/headphone HEADPHONE plug"},
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	{{{0,0}, EV_SW, SW_MICROPHONE_INSERT, 0},
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		"jack/microphone MICROPHONE unplug"},
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	{{{0,0}, EV_SW, SW_MICROPHONE_INSERT, 1},
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		"jack/microphone MICROPHONE plug"},
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	{{{0,0}, EV_SW, SW_LINEOUT_INSERT, 0},
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		"jack/lineout LINEOUT unplug"},
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	{{{0,0}, EV_SW, SW_LINEOUT_INSERT, 1},
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		"jack/lineout LINEOUT plug"},
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#ifdef SW_VIDEOOUT_INSERT
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	{{{0,0}, EV_SW, SW_VIDEOOUT_INSERT, 0},
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		"jack/videoout VIDEOOUT unplug"},
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	{{{0,0}, EV_SW, SW_VIDEOOUT_INSERT, 1},
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		"jack/videoout VIDEOOUT plug"},
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#endif
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	{{{0,0}, EV_SW, SW_LINEIN_INSERT, 0},
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		"jack/linein LINEIN unplug"},
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	{{{0,0}, EV_SW, SW_LINEIN_INSERT, 1},
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		"jack/linein LINEIN plug"},
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#else
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 #warning SW_HEADPHONE_INSERT not found in input_layer.h. Support for plug/unplug events will be disabled. Please upgrade your kernel headers to Linux-3.2 or newer.
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#endif
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 	/*** MISCELLANEOUS ***/
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	/* blue access IBM button on Thinkpad T42p*/
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	{{{0,0}, EV_KEY, KEY_PROG1, 1}, "button/prog1 PROG1 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_VENDOR, 1}, "button/vendor VNDR 00000080 00000000"},
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	/* Fn-F2 produces KEY_BATTERY on Thinkpad T42p */
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	{{{0,0}, EV_KEY, KEY_BATTERY, 1},
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 		"button/battery BAT 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_SCREENLOCK, 1},
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 		"button/screenlock SCRNLCK 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_COFFEE, 1}, "button/coffee CFEE 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_WLAN, 1}, "button/wlan WLAN 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_FN_F1, 1}, "button/fnf1 FNF1 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_FN_F2, 1}, "button/fnf2 FNF2 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_FN_F6, 1}, "button/fnf6 FNF6 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_FN_F9, 1}, "button/fnf9 FNF9 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_FN_F10, 1}, "button/fnf10 FF10 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_FN_F11, 1}, "button/fnf11 FF11 00000080 00000000"},
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	/* F20 is sometimes used for micmute */
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	{{{0,0}, EV_KEY, KEY_F20, 1}, "button/f20 F20 00000080 00000000"},
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	/* Fn-F9 produces KEY_F24 on Thinkpad T42p */
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	{{{0,0}, EV_KEY, KEY_F24, 1}, "button/f24 F24 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_KBDILLUMTOGGLE, 1},
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 		"button/kbdillumtoggle KBILLUM 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_COPY, 1}, "button/copy COPY 00000080 00000000"},
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	{{{0,0}, EV_KEY, KEY_RESTART, 1}, "button/restart RSTR 00000080 00000000"},
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#if 0
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	/* These "EV_MSC, 4, x" events cause trouble.  They are triggered */
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	/* by unexpected keys on the keyboard.  */
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	/* The 4 is MSC_SCAN, so these are actually scan code events.  */
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 	/* Apparently there is no KEY_FN_BS, etc..., defined in input.h. */
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	/* EV_MSC, MSC_SCAN, KEY_MINUS  This is triggered by the minus key. */
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	{{{0,0}, EV_MSC, 4, 12}, "button/fnbs FNBS 00000080 00000000"},
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	/* EV_MSC, MSC_SCAN, KEY_EQUAL  Triggered by the equals key. */
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	{{{0,0}, EV_MSC, 4, 13}, "button/fnins FNINS 00000080 00000000"},
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	/* EV_MSC, MSC_SCAN, KEY_BACKSPACE   Triggered by the backspace key. */
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	{{{0,0}, EV_MSC, 4, 14}, "button/fndel FNDEL 00000080 00000000"},
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	/* EV_MSC, MSC_SCAN, KEY_E   Triggered by the 'E' key. */
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	{{{0,0}, EV_MSC, 4, 18}, "button/fnpgdown FNPGDOWN 00000080 00000000"},
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#endif
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};
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/* special support for the MUTE key, as the key toggles we want to
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 * consider repeated keys but don't report them all the time. We just
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 * ensure that the number of key presses (MOD 2) is correct.
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 */
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static const char *
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mute_string(struct input_event event)
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{
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	if (event.type == EV_KEY && event.code == KEY_MUTE) {
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		static size_t repeat_count;
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		if (event.value == 1) {
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			repeat_count = 1;
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			return "button/mute MUTE (key pressed)";
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		} else if (event.value == 2) {
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			repeat_count++;
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			return NULL;
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		} else if (event.value == 0) {
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			if (repeat_count % 2 == 0) {
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				return "button/mute MUTE (key released)";
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			}
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		}
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	}
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	return NULL;
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}
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/*----------------------------------------------------------------------*/
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/* Given an input event, returns the string corresponding to that event.
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   If there is no corresponding string, NULL is returned.  */
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static const char *
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event_string(struct input_event event)
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{
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	unsigned i;
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	/* for each entry in the event table */
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	/* ??? Is there a faster way?  This is triggered every time the user
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	 *     presses a key.  Maybe a simple hash algorithm?  Or a simple check
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	 *     for very common keys (alphanumeric) and bail before this?  */
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	for (i = 0; i < DIM(evtab); ++i)
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	{
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		/* if this is a matching event, return its string */
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		if (event.type == evtab[i].event.type  &&
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			event.code == evtab[i].event.code  &&
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			event.value == evtab[i].event.value) {
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			return evtab[i].str;
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		}
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	}
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	return NULL;
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}
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/*-----------------------------------------------------------------*/
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/* returns non-zero if the event type/code is one we need */
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static int 
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need_event(int type, int code)
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{
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	unsigned i;
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	/* for each entry in the event table */
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	for (i = 0; i < DIM(evtab); ++i) {
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		/* if we found a matching event */
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		if (type == evtab[i].event.type  &&
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			code == evtab[i].event.code) {
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			return 1;
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		}
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	}
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	return 0;
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}
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/*-----------------------------------------------------------------*/
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/* called when an input layer event is received */
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static void process_input(int fd)
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{
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	struct input_event event;
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	ssize_t nbytes;
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	const char *str;
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	static int nerrs;
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	struct connection *c;
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	char str2[100];
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	nbytes = TEMP_FAILURE_RETRY ( read(fd, &event, sizeof(event)) );
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	if (nbytes == 0) {
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		acpid_log(LOG_WARNING, "input layer connection closed");
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		exit(EXIT_FAILURE);
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	}
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	if (nbytes < 0) {
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		if (errno == ENODEV) {
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			acpid_log(LOG_WARNING, "input device has been disconnected, fd %d",
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			          fd);
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			delete_connection(fd);
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			return;
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		}
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		acpid_log(LOG_ERR, "input layer read error: %s (%d)",
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			strerror(errno), errno);
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		if (++nerrs >= ACPID_MAX_ERRS) {
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			acpid_log(LOG_ERR,
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				"too many errors reading "
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				"input layer - aborting");
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			exit(EXIT_FAILURE);
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		}
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		return;
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	}
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	/* ??? Is it possible for a partial message to come across? */
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	/*   If so, we've got more code to write... */
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	if (nbytes != sizeof(event)) {
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		acpid_log(LOG_WARNING, "input layer unexpected length: "
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			"%zd   expected: %zd", nbytes, sizeof(event));
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		return;
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	}
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	c = find_connection(fd);
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	/* if we're getting scancodes, we probably have a keyboard */
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	if (event.type == EV_MSC  &&  event.code == MSC_SCAN) {
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		if (c)
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			c->kybd = 1;  /* appears to be a keyboard device */
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	}
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	/* convert the event into a string */
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	if (tpmutefix) {
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		str = mute_string(event);
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		if (str ==  NULL)
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			str = event_string(event);
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	} else
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		str = event_string(event);
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	/* if this is not an event we care about, bail */
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	if (str == NULL)
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		return;
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	/* If we suspect this is a keyboard, and we have enough space, tack a 
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	 * "K" on to the end of the event string. */
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	if (c  &&  c->kybd  &&  strnlen(str, sizeof(str2)) <= sizeof(str2) - 3) {
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		strcpy(str2, str);
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		strcat(str2, " K");
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		str = str2;
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	}
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	/* if we're locked, don't process the event */
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	if (locked()) {
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		if (logevents) {
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			acpid_log(LOG_INFO,
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				"lockfile present, not processing "
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				"input layer event \"%s\"", str);
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		}
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		return;
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	}
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	if (logevents)
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		acpid_log(LOG_INFO,
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			"received input layer event \"%s\"", str);
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	/* send the event off to the handler */
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	acpid_handle_event(str);
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	if (logevents)
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		acpid_log(LOG_INFO,
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			"completed input layer event \"%s\"", str);
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}
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#define BITS_PER_LONG (sizeof(long) * 8)
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#define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
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#define OFF(x)  ((x)%BITS_PER_LONG)
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#define LONG(x) ((x)/BITS_PER_LONG)
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#define test_bit(bit, array)	((array[LONG(bit)] >> OFF(bit)) & 1)
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/*--------------------------------------------------------------------*/
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/* returns non-zero if the file descriptor supports one of the events */
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/* supported by event_string().  */
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static int 
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has_event(int fd)
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{
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	int type, code;
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	unsigned long bit[EV_MAX][NBITS(KEY_MAX)];
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	memset(bit, 0, sizeof(bit));
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	/* get the event type bitmap */
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	ioctl(fd, EVIOCGBIT(0, sizeof(bit[0])), bit[0]);
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	/* for each event type */
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	for (type = 0; type < EV_MAX; type++) {
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		/* if this event type is supported */
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		if (test_bit(type, bit[0])) {
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			/* skip sync */
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			if (type == EV_SYN) continue;
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			/* get the event code mask */
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			ioctl(fd, EVIOCGBIT(type, sizeof(bit[type])), bit[type]);
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			/* for each event code */
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			for (code = 0; code < KEY_MAX; code++) {
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				/* if this event code is supported */
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				if (test_bit(code, bit[type])) {
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					/* if we need this event */
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					if (need_event(type, code) != 0)
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						return 1;
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				}
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			}
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		}
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	}
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	return 0;
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}
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/*-----------------------------------------------------------------*
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 * open a single input layer file for input  */
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int open_inputfile(const char *filename)
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{
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	int fd;
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	struct connection c;
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	/* O_CLOEXEC: Make sure scripts we exec() (in event.c) don't get our file 
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       descriptors. */
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	fd = open(filename, O_RDONLY | O_NONBLOCK | O_CLOEXEC);
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	if (fd >= 0) {
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		char evname[256];
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		/* if this file doesn't have events we need, indicate failure */
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		if (!has_event(fd)) {
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			close(fd);
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			return -1;
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		}
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		/* get this event file's name for debugging */
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		strcpy(evname, "Unknown");
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		ioctl(fd, EVIOCGNAME(sizeof(evname)), evname);
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		acpid_log(LOG_DEBUG, "input layer %s (%s) "
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			"opened successfully, fd %d", filename, evname, fd);
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		/* add a connection to the list */
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		c.fd = fd;
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		c.process = process_input;
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		/* delete_connection() will free */
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		c.pathname = malloc(strlen(filename) + 1);
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		if (c.pathname)
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			strcpy(c.pathname, filename);
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		/* assume not a keyboard until we see a scancode */
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		c.kybd = 0;
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		if (add_connection(&c) < 0) {
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			close(fd);
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			acpid_log(LOG_ERR,
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				"can't add connection for input layer %s (%s)",
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				filename, evname);
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			return -1;
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		}
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		return 0;  /* success */
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	}
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	/* open unsuccessful */
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	return -1;
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}
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/*-----------------------------------------------------------------*
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 * open each of the appropriate /dev/input/event* files for input  */
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void open_input(void)
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{
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	char *filename = NULL;
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	glob_t globbuf;
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	unsigned i;
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	int success = 0;
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	/* get all the matching event filenames */
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	glob(ACPID_INPUTLAYERFILES, 0, NULL, &globbuf);
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	/* for each event file */
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	for (i = 0; i < globbuf.gl_pathc; ++i) {
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		filename = globbuf.gl_pathv[i];
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		/* open this input layer device file */
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		if (open_inputfile(filename) == 0)
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			success = 1;
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	}
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	if (!success)
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		acpid_log(LOG_ERR, "cannot open input layer");
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	globfree(&globbuf);
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}
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