/*
#             (C) 2008-2009 Elmar Kleijn <elmar_kleijn@hotmail.com>
#             (C) 2008-2009 Sjoerd Piepenbrink <need4weed@gmail.com>
#             (C) 2008-2009 Radjnies Bhansingh <radjnies@gmail.com>
#             (C) 2008-2010 Hans de Goede <hdegoede@redhat.com>

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser 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
 */

#include <sys/types.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <string.h>
#include <pwd.h>
#include "libv4lcontrol.h"
#include "libv4lcontrol-priv.h"
#include "../libv4lsyscall-priv.h"
#include <linux/videodev2.h>

#define ARRAY_SIZE(x) ((int)sizeof(x) / (int)sizeof((x)[0]))

/* List of cams which need special flags */
static const struct v4lcontrol_flags_info v4lcontrol_flags[] = {
	/* First: Upside down devices */
	/* Philips SPC200NC */
	{ 0x0471, 0x0325, 0, NULL, NULL, V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	/* Philips SPC300NC */
	{ 0x0471, 0x0326, 0, NULL, NULL, V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	/* Philips SPC210NC */
	{ 0x0471, 0x032d, 0, NULL, NULL, V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	/* Genius E-M 112 (also want whitebalance by default) */
	{ 0x093a, 0x2476, 0, NULL, NULL,
		V4LCONTROL_HFLIPPED|V4LCONTROL_VFLIPPED | V4LCONTROL_WANTS_WB, 1500 },

	/* Laptops (and all in one PC's) */
	{ 0x0402, 0x5606, 0, "AOpen", "i45GMt-HR R1.02 Dec.21.2009",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED, 0,
		"RM plc", "RM ONE ECOQUIET 300" },
	{ 0x0402, 0x5606, 0, "Intel Corporation", "DQ45CB",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED, 0,
		"RM plc", "RM EXPERT 3040" },
	{ 0x046d, 0x09b2, 0, "FUJITSU", "FJNB1C9",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED, 0,
		"FUJITSU SIEMENS", "LIFEBOOK P7230" },
	{ 0x046d, 0x09b2, 0, "FUJITSU", "FJNB1C9",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED, 0,
		"FUJITSU", "LifeBook P7230" },
	{ 0x04f2, 0xb012, 0, "ASUSTeK Computer Inc.        ", "F7E       ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb012, 0, "ASUSTeK Computer Inc.        ", "F7F       ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb012, 0, "ASUSTeK Computer Inc.        ", "F7Kr      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb012, 0, "ASUSTeK Computer Inc.        ", "F7L       ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb012, 0, "ASUSTeK Computer Inc.        ", "F7Se      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb012, 0, "ASUSTeK Computer Inc.        ", "F7SR      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb012, 0, "ASUSTeK Computer Inc.        ", "F7Z       ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb012, 0, "ASUSTeK Computer Inc.        ", "G50VT     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb012, 0, "ASUSTeK Computer Inc.        ", "T14C      ",
		V4LCONTROL_HFLIPPED|V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb012, 0, "ASUSTeK Computer Inc.        ", "W7S       ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb012, 0, "ASUSTeK Computer Inc.        ", "W7Sg      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb012, 0, "ASUSTeK Computer Inc.        ", "X55SR     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb012, 0, "ASUSTeK Computer Inc.        ", "X55SV     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb012, 0, "ASUSTeK Computer Inc.        ", "X71Vn     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb012, 0, "ASUSTeK Computer Inc.        ", "X71Q      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb012, 0, "PEGATRON CORPORATION         ", "X71SL     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb012, 0, "ASUSTeK Computer Inc.        ", "X71Sr     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	/* Note no whitespace padding for board vendor, this is not a typo */
	{ 0x04f2, 0xb012, 0, "PEGATRON CORPORATION", "X71TL     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	/* These 3 PACKARD BELL's seem to be Asus notebook in disguise */
	{ 0x04f2, 0xb012, 0, "Packard Bell BV", "T32A      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb012, 0, "PACKARD BELL BV              ", "EasyNote_BG45",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb012, 0, "PACKARD BELL BV              ", "EasyNote_BG46",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb034, 0, "ASUSTeK Computer Inc.        ", "G70Sg     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb036, 0, "ASUSTeK Computer Inc.        ", "U6S       ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb036, 0, "ASUSTeK Computer Inc.        ", "U6Sg      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb036, 0, "ASUSTeK Computer Inc.        ", "U6V       ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb036, 0, "ASUSTeK Computer Inc.        ", "UL30A     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb036, 0, "ASUSTeK Computer Inc.        ", "UL30VT    ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb036, 0, "ASUSTeK Computer Inc.        ", "UL50Ag    ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb036, 0, "ASUSTeK Computer Inc.        ", "UL50VT    ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "F52Q      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "K40IE     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "K40IJ     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "K40IN      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "K50ID     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "K50IE     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "K50IJ     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "K50IN      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "K51AE     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "K52F",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "K52Jr",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "K61IC     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "K70AB     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "K70AC     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "K70AD     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "K70AE     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "K70IC     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "K70IJ     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "K70IO     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "N10J      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "N10Jc     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "N20A      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "N51Vn     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "N61Vn     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "N61Vg     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUS CORPORATION            ", "N90SC     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "U6Vc      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer Inc.        ", "X58LE     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	/* Note no whitespace padding for these b071 models, this is not a typo */
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer INC.", "K40AB",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer INC.", "K50AB",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "ASUSTeK Computer INC.", "N5051Tp",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb071, 0, "PEGATRON CORP.", NULL,
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED, 0,
		"Philco", "S\202rie PHN10050" },
	{ 0x04f2, 0xb072, 0, "ASUSTeK Computer Inc.        ", "K50IJ     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb106, 0, "ASUSTeK Computer Inc.        ", "N50Vc      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb106, 0, "ASUSTeK Computer Inc.        ", "N50Vn      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb106, 0, "ASUSTeK Computer Inc.        ", "N51Vf      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb106, 0, "ASUSTeK Computer Inc.        ", "N51Vg      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb106, 0, "ASUSTeK Computer Inc.        ", "N51Vn     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb106, 0, "ASUSTeK Computer INC.", "N5051Tp",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb16b, 0, "ASUSTeK Computer Inc.        ", "U20A      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb16b, 0, "ASUSTeK Computer Inc.        ", "U80A      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb16b, 0, "ASUSTeK Computer Inc.        ", "U80V      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb1b9, 0, "ASUSTeK Computer Inc.        ", "U52F",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb1bb, 0, "ASUSTeK Computer Inc.        ", "N82JV",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb1bb, 0, "ASUSTeK Computer Inc.        ", "N82JQ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb1be, 0, "ASUSTeK Computer Inc.        ", "UL30JT",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb1e5, 0, "ASUSTeK Computer Inc.        ", "K52F",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x04f2, 0xb1e5, 0, "ASUSTeK Computer Inc.        ", "K52Jc",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa111, 0, "ASUSTeK Computer Inc.", "F5RL      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa111, 0, "ASUSTeK Computer Inc.        ", "F5SL    ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa111, 0, "PEGATRON CORPORATION         ", "F5SR    ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUS CORPORATION            ", "F70SL     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "F82Q      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "K40IJ     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "K40IN      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "K50IJ     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "K51AC     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "K51AE     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "K52Jr",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "K60IJ     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "K60IN      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "K61IC     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "K70AB     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "K70AC     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "K70AD     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "K70AE     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "K70IC     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "K70IJ     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "K70IO     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "N10E      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "N10J      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "N10Jb     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "N10Jc     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "N20A      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "N61Vn     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUS CORPORATION            ", "N70SV     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUS CORPORATION            ", "N90SV     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "U80V      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer Inc.        ", "X58LE     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	/* Note no whitespace padding for these models, this is not a typo */
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer INC.", "K40AB",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "ASUSTeK Computer INC.", "K50AD",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa116, 0, "To be filled by O.E.M.", "H34",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED, 0,
		"  IDEALMAX", "H34" },
	{ 0x064e, 0xa136, 0, "ASUSTeK Computer Inc.        ", "UL30A     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa136, 0, "ASUSTeK Computer Inc.        ", "UL30VT    ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa136, 0, "ASUSTeK Computer Inc.        ", "UL50A     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa136, 0, "ASUSTeK Computer Inc.        ", "UL50Ag    ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa136, 0, "ASUSTeK Computer Inc.        ", "UL50AT    ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa136, 0, "ASUSTeK Computer Inc.        ", "UL50Vg    ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x064e, 0xa136, 0, "ASUSTeK Computer Inc.        ", "UL50VT    ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x090c, 0xe370, 0, "ASUSTeK Computer Inc.        ", "U6S       ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x090c, 0xe370, 0, "ASUSTeK Computer Inc.        ", "U6Sg      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x090c, 0xe370, 0, "ASUSTeK Computer Inc.        ", "VX3       ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x13d3, 0x5094, 0, "ASUS CORPORATION            ", "K50C      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x13d3, 0x5094, 0, "ASUSTeK Computer Inc.        ", "K50IJ     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x13d3, 0x5094, 0, "ASUSTeK Computer Inc.        ", "K52F",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x13d3, 0x5094, 0, "ASUSTeK Computer Inc.        ", "P50IJ     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x13d3, 0x5094, 0, "ASUSTeK Computer Inc.        ", "P81IJ     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x13d3, 0x5111, 0, "ASUSTeK Computer INC.", "T101MT",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x13d3, 0x5122, 0, "ASUSTeK Computer Inc.        ", "N61Ja",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x13d3, 0x5122, 0, "ASUSTeK Computer Inc.        ", "N61Jq",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x13d3, 0x5122, 0, "ASUSTeK Computer INC.", "N61Jv",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x13d3, 0x5130, 0, "ASUSTeK Computer INC.", "K50AF",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x13d3, 0x5130, 0, "ASUSTeK Computer Inc.        ", "K50ID     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x13d3, 0x5130, 0, "ASUSTeK Computer Inc.        ", "K50IE     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x13d3, 0x5130, 0, "ASUSTeK Computer Inc.        ", "K50IP      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x13d3, 0x5130, 0, "ASUSTeK Computer Inc.        ", "K52Jc",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x13d3, 0x5130, 0, "ASUSTeK Computer Inc.        ", "K52JB",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x13d3, 0x5130, 0, "ASUSTeK Computer Inc.        ", "K52JK",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x13d3, 0x5130, 0, "ASUSTeK Computer Inc.        ", "K52Jr",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x13d3, 0x5130, 0, "ASUSTeK Computer Inc.        ", "K70AF     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x13d3, 0x5130, 0, "ASUSTeK Computer Inc.        ", "K70ID     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0x1120, 0, "ASUSTeK Computer Inc.        ", "K50ID     ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0x1408, 0, "ASUSTeK Computer Inc.        ", "K40IN      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0x1408, 0, "ASUSTeK Computer Inc.        ", "K50IN      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0x5a35, 0, "ASUSTeK Computer Inc.        ", "F3E       ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0x5a35, 0, "ASUSTeK Computer Inc.        ", "F3Ka      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0x5a35, 0, "ASUSTeK Computer Inc.        ", "F3Ke      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0x5a35, 0, "ASUSTeK Computer Inc.        ", "F3Q       ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0x5a35, 0, "ASUSTeK Computer Inc.        ", "F3Sa      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0x5a35, 0, "ASUSTeK Computer Inc.        ", "F3Sg      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0x5a35, 0, "ASUSTeK Computer Inc.        ", "F3Sr      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0x5a35, 0, "ASUSTeK Computer Inc.        ", "F5N       ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0x5a35, 0, "ASUSTeK Computer Inc.        ", "F5GL       ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	/* Note no whitespace padding for vendor, this is not a typo */
	{ 0x174f, 0x5a35, 0, "ASUSTeK Computer Inc.", "F5RL      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0x5a35, 0, "ASUSTeK Computer Inc.        ", "F5SL    ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0x5a35, 0, "ASUSTeK Computer Inc.        ", "F5Z       ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0x5a35, 0, "ASUSTeK Computer Inc.        ", "G1S       ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0x5a35, 0, "ASUSTeK Computer Inc.        ", "G1Sn      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0x5a35, 0, "ASUSTeK Computer Inc.        ", "G2S       ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0x8a31, 0, "ASUSTeK Computer Inc.        ", "F9E       ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0xa311, 0, "ASUSTeK Computer Inc.        ", "A3F       ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x174f, 0xa311, 0, "ASUSTeK Computer Inc.        ", "A3V       ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x17ef, 0x4816, 0, "LENOVO", "3093W11",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED, 0, NULL, NULL, NULL,
		"ThinkPad X201 Tablet" },
	{ 0x1d4d, 0x1002, 0, "ASUSTeK Computer Inc.        ", "B50A      ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },
	{ 0x5986, 0x0200, 0, "LENOVO", "SPEEDY    ",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED, 0, NULL, NULL, NULL,
		"Lenovo IdeaPad Y510" },
	{ 0x5986, 0x0205, 0, "LENOVO", "Base Board Product Name",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED, 0, NULL, NULL, NULL,
		"Lenovo IdeaPad U330" },
	{ 0x5986, 0x0205, 0, "LENOVO", "Base Board Product Name",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED, 0, NULL, NULL, NULL,
		"Lenovo IdeaPad Y330" },
	{ 0xeb1a, 0x2750, 0, "CLEVO", "D900K",
		V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },

	/* Second: devices which should use some software processing by default */
	/* sn9c101 / sn9c102 based devices (sonixb) */
	{ 0x0c45, 0x6011, 0,    NULL, NULL, 0, 1500 }, /* OV6650, no WB needed */
	{ 0x0c45, 0x6019, 0,    NULL, NULL, 0, 1500 }, /* OV7630, no WB needed */
	{ 0x0c45, 0x608f, 0,    NULL, NULL, 0, 1500 }, /* OV7630, no WB needed */
	{ 0x0c45, 0x60b0, 0,    NULL, NULL, 0, 1500 }, /* OV7630, no WB needed */
	{ 0x0c45, 0x6000, 0x1f, NULL, NULL, V4LCONTROL_WANTS_WB, 1500 }, /* other */
	{ 0x0c45, 0x6020, 0x0f, NULL, NULL, V4LCONTROL_WANTS_WB, 1500 }, /* other */
	{ 0x0c45, 0x60af, 0,    NULL, NULL, V4LCONTROL_WANTS_WB, 1500 }, /* PAS202 */
	/* sn9c105 / sn9c120 based devices (sonixj) */
	{ 0x0c45, 0x60fe, 0,    NULL, NULL, V4LCONTROL_WANTS_WB }, /* OV7630 */
	{ 0x0c45, 0x610e, 0,    NULL, NULL, V4LCONTROL_WANTS_WB }, /* OV7630 */
	{ 0x0c45, 0x6128, 0,    NULL, NULL, V4LCONTROL_WANTS_WB }, /* OM6802 */
	{ 0x0c45, 0x612e, 0,    NULL, NULL, V4LCONTROL_WANTS_WB }, /* OV7630 */
	{ 0x0c45, 0x613e, 0,    NULL, NULL, V4LCONTROL_WANTS_WB }, /* OV7630 */
	/* Pac207 based devices */
	{ 0x041e, 0x4028, 0,    NULL, NULL, V4LCONTROL_WANTS_WB, 1500 },
	{ 0x093a, 0x2460, 0x1f, NULL, NULL, V4LCONTROL_WANTS_WB, 1500 },
	{ 0x145f, 0x013a, 0,    NULL, NULL, V4LCONTROL_WANTS_WB, 1500 },
	{ 0x2001, 0xf115, 0,    NULL, NULL, V4LCONTROL_WANTS_WB, 1500 },
	/* Pac7302 based devices */
	{ 0x093a, 0x2620, 0x0f, NULL, NULL,
		V4LCONTROL_ROTATED_90_JPEG | V4LCONTROL_WANTS_WB, 1500 },
	{ 0x06f8, 0x3009, 0,    NULL, NULL,
		V4LCONTROL_ROTATED_90_JPEG | V4LCONTROL_WANTS_WB, 1500 },
	/* Pac7311 based devices */
	{ 0x093a, 0x2600, 0x0f, NULL, NULL, V4LCONTROL_WANTS_WB },
	/* sq905 devices */
	{ 0x2770, 0x9120, 0,    NULL, NULL, V4LCONTROL_WANTS_WB },
	/* spca561 revison 12a devices */
	{ 0x041e, 0x403b, 0,    NULL, NULL, V4LCONTROL_WANTS_WB_AUTOGAIN },
	{ 0x046d, 0x0928, 7,    NULL, NULL, V4LCONTROL_WANTS_WB_AUTOGAIN },
	/* logitech quickcam express stv06xx 2 versions:
	   pb0100   only needs whitebalance, see software autogain code enable below
	   hdcs10xx needs both whitebalance and autogain. */
	{ 0x046d, 0x0840, 0,    NULL, NULL, V4LCONTROL_WANTS_WB_AUTOGAIN },
	/* logitech quickcam messenger variants, st6422 */
	{ 0x046d, 0x08f0, 0,    NULL, NULL, V4LCONTROL_WANTS_AUTOGAIN },
	{ 0x046d, 0x08f5, 0,    NULL, NULL, V4LCONTROL_WANTS_AUTOGAIN },
	{ 0x046d, 0x08f6, 0,    NULL, NULL, V4LCONTROL_WANTS_AUTOGAIN },
	{ 0x046d, 0x08da, 0,    NULL, NULL, V4LCONTROL_WANTS_AUTOGAIN },
	/* mr97310a cams, note some models do not have the necessary controls, for
	   those we will only do whitebal. see software autogain code enable below */
	{ 0x08ca, 0x0111, 0,    NULL, NULL, V4LCONTROL_WANTS_WB_AUTOGAIN },
	{ 0x093a, 0x010e, 1,    NULL, NULL, V4LCONTROL_WANTS_WB_AUTOGAIN },
	/* stv0680 based cams */
	{ 0x0553, 0x0202, 0,    NULL, NULL, V4LCONTROL_WANTS_WB },
	{ 0x041e, 0x4007, 0,    NULL, NULL, V4LCONTROL_WANTS_WB },
};

static const struct v4l2_queryctrl fake_controls[];

static void v4lcontrol_get_dmi_string(const char *string, char *buf, int size)
{
	FILE *f;
	char *s, sysfs_name[512];

	snprintf(sysfs_name, sizeof(sysfs_name),
			"/sys/class/dmi/id/%s", string);
	f = fopen(sysfs_name, "r");
	if (!f) {
		/* Try again with a different sysfs path, not sure if this is needed
		   but we used to look under /sys/devices/virtual/dmi/id in older
		   libv4l versions, but this did not work with some kernels */
		snprintf(sysfs_name, sizeof(sysfs_name),
				"/sys/devices/virtual/dmi/id/%s", string);
		f = fopen(sysfs_name, "r");
		if (!f) {
			buf[0] = 0;
			return;
		}
	}

	s = fgets(buf, size, f);
	if (s)
		s[strlen(s) - 1] = 0;
	fclose(f);
}

static int v4lcontrol_get_usb_ids(struct v4lcontrol_data *data,
		unsigned short *vendor_id, unsigned short *product_id)
{
	FILE *f;
	int i, minor;
	struct stat st;
	char sysfs_name[512];
	char c, *s, buf[32];

	if (fstat(data->fd, &st) || !S_ISCHR(st.st_mode))
		return 0; /* Should never happen */

	/* <Sigh> find ourselve in sysfs */
	for (i = 0; i < 256; i++) {
		snprintf(sysfs_name, sizeof(sysfs_name),
				"/sys/class/video4linux/video%d/dev", i);
		f = fopen(sysfs_name, "r");
		if (!f)
			continue;

		s = fgets(buf, sizeof(buf), f);
		fclose(f);

		if (s && sscanf(buf, "%*d:%d%c", &minor, &c) == 2 && c == '\n' &&
				minor == minor(st.st_rdev))
			break;
	}
	if (i == 256)
		return 0; /* Not found, sysfs not mounted? */

	/* Get vendor and product ID */
	snprintf(sysfs_name, sizeof(sysfs_name),
			"/sys/class/video4linux/video%d/device/modalias", i);
	f = fopen(sysfs_name, "r");
	if (f) {
		s = fgets(buf, sizeof(buf), f);
		fclose(f);

		if (!s || sscanf(s, "usb:v%4hxp%4hx%c", vendor_id, product_id, &c) != 3 ||
				c != 'd')
			return 0; /* Not an USB device */
	} else {
		/* Try again assuming the device link points to the usb
		   device instead of the usb interface (bug in older versions
		   of gspca) */

		/* Get product ID */
		snprintf(sysfs_name, sizeof(sysfs_name),
				"/sys/class/video4linux/video%d/device/idVendor", i);
		f = fopen(sysfs_name, "r");
		if (!f)
			return 0; /* Not an USB device (or no sysfs) */

		s = fgets(buf, sizeof(buf), f);
		fclose(f);

		if (!s || sscanf(s, "%04hx%c", vendor_id, &c) != 2 || c != '\n')
			return 0; /* Should never happen */

		/* Get product ID */
		snprintf(sysfs_name, sizeof(sysfs_name),
				"/sys/class/video4linux/video%d/device/idProduct", i);
		f = fopen(sysfs_name, "r");
		if (!f)
			return 0; /* Should never happen */

		s = fgets(buf, sizeof(buf), f);
		fclose(f);

		if (!s || sscanf(s, "%04hx%c", product_id, &c) != 2 || c != '\n')
			return 0; /* Should never happen */
	}

	return 1;
}

static void v4lcontrol_get_flags_from_db(struct v4lcontrol_data *data,
		unsigned short vendor_id, unsigned short product_id)
{
	char dmi_system_vendor[512], dmi_system_name[512], dmi_system_version[512];
	char dmi_board_vendor[512], dmi_board_name[512], dmi_board_version[512];
	int i;

	/* Get DMI board and system strings */
	v4lcontrol_get_dmi_string("sys_vendor", dmi_system_vendor,
			sizeof(dmi_system_vendor));
	v4lcontrol_get_dmi_string("product_name", dmi_system_name,
			sizeof(dmi_system_name));
	v4lcontrol_get_dmi_string("product_version", dmi_system_version,
			sizeof(dmi_system_version));

	v4lcontrol_get_dmi_string("board_vendor", dmi_board_vendor,
			sizeof(dmi_board_vendor));
	v4lcontrol_get_dmi_string("board_name", dmi_board_name,
			sizeof(dmi_board_name));
	v4lcontrol_get_dmi_string("board_version", dmi_board_version,
			sizeof(dmi_board_version));

	for (i = 0; i < ARRAY_SIZE(v4lcontrol_flags); i++)
		if (v4lcontrol_flags[i].vendor_id == vendor_id &&
				v4lcontrol_flags[i].product_id ==
				(product_id & ~v4lcontrol_flags[i].product_mask) &&

				(v4lcontrol_flags[i].dmi_system_vendor == NULL ||
				 !strcmp(v4lcontrol_flags[i].dmi_system_vendor, dmi_system_vendor)) &&
				(v4lcontrol_flags[i].dmi_system_name == NULL ||
				 !strcmp(v4lcontrol_flags[i].dmi_system_name, dmi_system_name)) &&
				(v4lcontrol_flags[i].dmi_system_version == NULL ||
				 !strcmp(v4lcontrol_flags[i].dmi_system_version, dmi_system_version)) &&

				(v4lcontrol_flags[i].dmi_board_vendor == NULL ||
				 !strcmp(v4lcontrol_flags[i].dmi_board_vendor, dmi_board_vendor)) &&
				(v4lcontrol_flags[i].dmi_board_name == NULL ||
				 !strcmp(v4lcontrol_flags[i].dmi_board_name, dmi_board_name)) &&
				(v4lcontrol_flags[i].dmi_board_version == NULL ||
				 !strcmp(v4lcontrol_flags[i].dmi_board_version, dmi_board_version))) {
			data->flags |= v4lcontrol_flags[i].flags;
			data->flags_info = &v4lcontrol_flags[i];
			break;
		}
}

struct v4lcontrol_data *v4lcontrol_create(int fd, int always_needs_conversion)
{
	int shm_fd;
	int i, rc, got_usb_ids, init = 0;
	char *s, shm_name[256], pwd_buf[1024];
	struct v4l2_capability cap;
	struct v4l2_queryctrl ctrl;
	struct passwd pwd, *pwd_p;
	unsigned short vendor_id = 0;
	unsigned short product_id = 0;
	struct v4l2_input input;

	struct v4lcontrol_data *data = calloc(1, sizeof(struct v4lcontrol_data));

	if (!data) {
		fprintf(stderr, "libv4lcontrol: error: out of memory!\n");
		return NULL;
	}

	data->fd = fd;

	/* Check if the driver has indicated some form of flipping is needed */
	if ((SYS_IOCTL(data->fd, VIDIOC_G_INPUT, &input.index) == 0) &&
			(SYS_IOCTL(data->fd, VIDIOC_ENUMINPUT, &input) == 0)) {
		if (input.status & V4L2_IN_ST_HFLIP)
			data->flags |= V4LCONTROL_HFLIPPED;
		if (input.status & V4L2_IN_ST_VFLIP)
			data->flags |= V4LCONTROL_VFLIPPED;
	}

	got_usb_ids = v4lcontrol_get_usb_ids(data, &vendor_id, &product_id);
	if (got_usb_ids)
		v4lcontrol_get_flags_from_db(data, vendor_id, product_id);

	/* Allow overriding through environment */
	s = getenv("LIBV4LCONTROL_FLAGS");
	if (s)
		data->flags = strtol(s, NULL, 0);

	ctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
	if (SYS_IOCTL(data->fd, VIDIOC_QUERYCTRL, &ctrl) == 0)
		data->priv_flags |= V4LCONTROL_SUPPORTS_NEXT_CTRL;

	/* If the device always needs conversion, we can add fake controls at no cost
	   (no cost when not activated by the user that is) */
	if (always_needs_conversion || v4lcontrol_needs_conversion(data)) {
		for (i = 0; i < V4LCONTROL_AUTO_ENABLE_COUNT; i++) {
			ctrl.id = fake_controls[i].id;
			rc = SYS_IOCTL(data->fd, VIDIOC_QUERYCTRL, &ctrl);
			if (rc == -1 || (rc == 0 && (ctrl.flags & V4L2_CTRL_FLAG_DISABLED)))
				data->controls |= 1 << i;
		}
	}

	/* Check if a camera does not have hardware autogain and has the necessary
	   controls, before enabling sw autogain, even if this is requested by flags.
	   This is necessary because some cameras share a USB-ID, but can have
	   different sensors with / without autogain or the necessary controls. */
	while (data->flags & V4LCONTROL_WANTS_AUTOGAIN) {
		ctrl.id = V4L2_CID_AUTOGAIN;
		rc = SYS_IOCTL(data->fd, VIDIOC_QUERYCTRL, &ctrl);
		if (rc == 0 && !(ctrl.flags & V4L2_CTRL_FLAG_DISABLED))
			break;

		ctrl.id = V4L2_CID_EXPOSURE;
		rc = SYS_IOCTL(data->fd, VIDIOC_QUERYCTRL, &ctrl);
		if (rc != 0 || (ctrl.flags & V4L2_CTRL_FLAG_DISABLED))
			break;

		ctrl.id = V4L2_CID_GAIN;
		rc = SYS_IOCTL(data->fd, VIDIOC_QUERYCTRL, &ctrl);
		if (rc != 0 || (ctrl.flags & V4L2_CTRL_FLAG_DISABLED))
			break;

		data->controls |= 1 << V4LCONTROL_AUTOGAIN |
			1 << V4LCONTROL_AUTOGAIN_TARGET;
		break;
	}

	/* Allow overriding through environment */
	s = getenv("LIBV4LCONTROL_CONTROLS");
	if (s)
		data->controls = strtol(s, NULL, 0);

	if (data->controls == 0)
		return data; /* No need to create a shared memory segment */

	if (SYS_IOCTL(fd, VIDIOC_QUERYCAP, &cap)) {
		perror("libv4lcontrol: error querying device capabilities");
		goto error;
	}

	if (getpwuid_r(geteuid(), &pwd, pwd_buf, sizeof(pwd_buf), &pwd_p) == 0) {
		if (got_usb_ids)
			snprintf(shm_name, 256, "/libv4l-%s:%s:%04x:%04x:%s", pwd.pw_name,
					cap.bus_info, (int)vendor_id, (int)product_id, cap.card);
		else
			snprintf(shm_name, 256, "/libv4l-%s:%s:%s", pwd.pw_name,
					cap.bus_info, cap.card);
	} else {
		perror("libv4lcontrol: error getting username using uid instead");
		if (got_usb_ids)
			snprintf(shm_name, 256, "/libv4l-%lu:%s:%04x:%04x:%s",
					(unsigned long)geteuid(), cap.bus_info,
					(int)vendor_id, (int)product_id, cap.card);
		else
			snprintf(shm_name, 256, "/libv4l-%lu:%s:%s", (unsigned long)geteuid(),
					cap.bus_info, cap.card);
	}

	/* / is not allowed inside shm names */
	for (i = 1; shm_name[i]; i++)
		if (shm_name[i] == '/')
			shm_name[i] = '-';

	/* Open the shared memory object identified by shm_name */
	shm_fd = shm_open(shm_name, (O_CREAT | O_EXCL | O_RDWR), (S_IREAD | S_IWRITE));
	if (shm_fd >= 0)
		init = 1;
	else
		shm_fd = shm_open(shm_name, O_RDWR, (S_IREAD | S_IWRITE));

	if (shm_fd >= 0) {
		/* Set the shared memory size */
		ftruncate(shm_fd, V4LCONTROL_SHM_SIZE);

		/* Retreive a pointer to the shm object */
		data->shm_values = mmap(NULL, V4LCONTROL_SHM_SIZE, (PROT_READ | PROT_WRITE),
				MAP_SHARED, shm_fd, 0);
		close(shm_fd);

		if (data->shm_values == MAP_FAILED) {
			perror("libv4lcontrol: error shm mmap failed");
			data->shm_values = NULL;
		}
	} else
		perror("libv4lcontrol: error creating shm segment failed");

	/* Fall back to malloc */
	if (data->shm_values == NULL) {
		fprintf(stderr,
				"libv4lcontrol: falling back to malloc-ed memory for controls\n");
		data->shm_values = malloc(V4LCONTROL_SHM_SIZE);
		if (!data->shm_values) {
			fprintf(stderr, "libv4lcontrol: error: out of memory!\n");
			goto error;
		}
		init = 1;
		data->priv_flags |= V4LCONTROL_MEMORY_IS_MALLOCED;
	}

	if (init) {
		/* Initialize the new shm object we created */
		memset(data->shm_values, 0, V4LCONTROL_SHM_SIZE);

		for (i = 0; i < V4LCONTROL_COUNT; i++)
			data->shm_values[i] = fake_controls[i].default_value;

		if (data->flags & V4LCONTROL_WANTS_WB)
			data->shm_values[V4LCONTROL_WHITEBALANCE] = 1;

		if (data->flags_info && data->flags_info->default_gamma)
			data->shm_values[V4LCONTROL_GAMMA] = data->flags_info->default_gamma;
	}

	return data;

error:
	free(data);
	return NULL;
}

void v4lcontrol_destroy(struct v4lcontrol_data *data)
{
	if (data->controls) {
		if (data->priv_flags & V4LCONTROL_MEMORY_IS_MALLOCED)
			free(data->shm_values);
		else
			munmap(data->shm_values, V4LCONTROL_SHM_SIZE);
	}
	free(data);
}

static const struct v4l2_queryctrl fake_controls[V4LCONTROL_COUNT] = {
	{
		.id = V4L2_CID_AUTO_WHITE_BALANCE,
		.type = V4L2_CTRL_TYPE_BOOLEAN,
		.name =  "Whitebalance (software)",
		.minimum = 0,
		.maximum = 1,
		.step = 1,
		.default_value = 0,
		.flags = 0
	}, {
		.id = V4L2_CID_HFLIP,
		.type = V4L2_CTRL_TYPE_BOOLEAN,
		.name =  "Horizontal flip (sw)",
		.minimum = 0,
		.maximum = 1,
		.step = 1,
		.default_value = 0,
		.flags = 0
	}, {
		.id = V4L2_CID_VFLIP,
		.type = V4L2_CTRL_TYPE_BOOLEAN,
		.name =  "Vertical flip (sw)",
		.minimum = 0,
		.maximum = 1,
		.step = 1,
		.default_value = 0,
		.flags = 0
	}, {
		.id = V4L2_CID_GAMMA,
		.type = V4L2_CTRL_TYPE_INTEGER,
		.name =  "Gamma (software)",
		.minimum = 500,  /* == 0.5 */
		.maximum = 3000, /* == 3.0 */
		.step = 1,
		.default_value = 1000, /* == 1.0 */
		.flags = 0
	}, { /* Dummy place holder for V4LCONTROL_AUTO_ENABLE_COUNT */
	}, {
		.id = V4L2_CID_AUTOGAIN,
		.type = V4L2_CTRL_TYPE_BOOLEAN,
		.name =  "Auto Gain (software)",
		.minimum = 0,
		.maximum = 1,
		.step = 1,
		.default_value = 1,
		.flags = 0
	}, {
		.id = V4L2_CTRL_CLASS_USER + 0x2000, /* FIXME */
		.type = V4L2_CTRL_TYPE_INTEGER,
		.name =  "Auto Gain target",
		.minimum = 0,
		.maximum = 255,
		.step = 1,
		.default_value = 100,
		.flags = 0
	},
};

static void v4lcontrol_copy_queryctrl(struct v4lcontrol_data *data,
		struct v4l2_queryctrl *ctrl, int i)
{
	memcpy(ctrl, &fake_controls[i], sizeof(struct v4l2_queryctrl));

	/* Hmm, not pretty */
	if (ctrl->id == V4L2_CID_AUTO_WHITE_BALANCE &&
			(data->flags & V4LCONTROL_WANTS_WB))
		ctrl->default_value = 1;

	if (ctrl->id == V4L2_CID_GAMMA && data->flags_info &&
			data->flags_info->default_gamma)
		ctrl->default_value = data->flags_info->default_gamma;
}

int v4lcontrol_vidioc_queryctrl(struct v4lcontrol_data *data, void *arg)
{
	int i;
	struct v4l2_queryctrl *ctrl = arg;
	int retval;
	uint32_t orig_id = ctrl->id;

	/* if we have an exact match return it */
	for (i = 0; i < V4LCONTROL_COUNT; i++)
		if ((data->controls & (1 << i)) &&
				ctrl->id == fake_controls[i].id) {
			v4lcontrol_copy_queryctrl(data, ctrl, i);
			return 0;
		}

	/* find out what the kernel driver would respond. */
	retval = SYS_IOCTL(data->fd, VIDIOC_QUERYCTRL, arg);

	if ((data->priv_flags & V4LCONTROL_SUPPORTS_NEXT_CTRL) &&
			(orig_id & V4L2_CTRL_FLAG_NEXT_CTRL)) {
		/* If the hardware has no more controls check if we still have any
		   fake controls with a higher id then the hardware's highest */
		if (retval)
			ctrl->id = V4L2_CTRL_ID_MASK;

		/* If any of our controls have an id > orig_id but less than
		   ctrl->id then return that control instead. Note we do not
		   break when we have a match, but keep iterating, so that
		   we end up with the fake ctrl with the lowest CID > orig_id. */
		for (i = 0; i < V4LCONTROL_COUNT; i++)
			if ((data->controls & (1 << i)) &&
					(fake_controls[i].id > (orig_id & ~V4L2_CTRL_FLAG_NEXT_CTRL)) &&
					(fake_controls[i].id <= ctrl->id)) {
				v4lcontrol_copy_queryctrl(data, ctrl, i);
				retval = 0;
			}
	}

	return retval;
}

int v4lcontrol_vidioc_g_ctrl(struct v4lcontrol_data *data, void *arg)
{
	int i;
	struct v4l2_control *ctrl = arg;

	for (i = 0; i < V4LCONTROL_COUNT; i++)
		if ((data->controls & (1 << i)) &&
				ctrl->id == fake_controls[i].id) {
			ctrl->value = data->shm_values[i];
			return 0;
		}

	return SYS_IOCTL(data->fd, VIDIOC_G_CTRL, arg);
}

int v4lcontrol_vidioc_s_ctrl(struct v4lcontrol_data *data, void *arg)
{
	int i;
	struct v4l2_control *ctrl = arg;

	for (i = 0; i < V4LCONTROL_COUNT; i++)
		if ((data->controls & (1 << i)) &&
				ctrl->id == fake_controls[i].id) {
			if (ctrl->value > fake_controls[i].maximum ||
					ctrl->value < fake_controls[i].minimum) {
				errno = EINVAL;
				return -1;
			}

			data->shm_values[i] = ctrl->value;
			return 0;
		}

	return SYS_IOCTL(data->fd, VIDIOC_S_CTRL, arg);
}

int v4lcontrol_get_flags(struct v4lcontrol_data *data)
{
	return data->flags;
}

int v4lcontrol_get_ctrl(struct v4lcontrol_data *data, int ctrl)
{
	if (data->controls & (1 << ctrl)) {
		/* Special case for devices with flipped input */
		if ((ctrl == V4LCONTROL_HFLIP && (data->flags & V4LCONTROL_HFLIPPED)) ||
				(ctrl == V4LCONTROL_VFLIP && (data->flags & V4LCONTROL_VFLIPPED)))
			return !data->shm_values[ctrl];

		return data->shm_values[ctrl];
	}

	return 0;
}

int v4lcontrol_controls_changed(struct v4lcontrol_data *data)
{
	int res;

	if (!data->controls)
		return 0;

	res = memcmp(data->shm_values, data->old_values,
			V4LCONTROL_COUNT * sizeof(unsigned int));

	memcpy(data->old_values, data->shm_values,
			V4LCONTROL_COUNT * sizeof(unsigned int));

	return res;
}

/* See the comment about this in libv4lconvert.h */
int v4lcontrol_needs_conversion(struct v4lcontrol_data *data)
{
	return data->flags || data->controls;
}
