auxdisplay: Move panel.c to drivers/auxdisplay folder

It looks like panel.c belongs to auxdisplay subsystem.

Move it to drivers/auxdisplay folder.
No functional changes intended.

Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 1796 insertions, 0 deletions

diff --git a/drivers/auxdisplay/panel.c b/drivers/auxdisplay/panel.c
new file mode 100644
index 000000000000..e0c014c2356f
--- /dev/null
+++ b/drivers/auxdisplay/panel.c
@@ -0,0 +1,1796 @@
+/*
+ * Front panel driver for Linux
+ * Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
+ * Copyright (C) 2016-2017 Glider bvba
+ *
+ * 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 code drives an LCD module (/dev/lcd), and a keypad (/dev/keypad)
+ * connected to a parallel printer port.
+ *
+ * The LCD module may either be an HD44780-like 8-bit parallel LCD, or a 1-bit
+ * serial module compatible with Samsung's KS0074. The pins may be connected in
+ * any combination, everything is programmable.
+ *
+ * The keypad consists in a matrix of push buttons connecting input pins to
+ * data output pins or to the ground. The combinations have to be hard-coded
+ * in the driver, though several profiles exist and adding new ones is easy.
+ *
+ * Several profiles are provided for commonly found LCD+keypad modules on the
+ * market, such as those found in Nexcom's appliances.
+ *
+ * FIXME:
+ *      - the initialization/deinitialization process is very dirty and should
+ *        be rewritten. It may even be buggy.
+ *
+ * TODO:
+ *	- document 24 keys keyboard (3 rows of 8 cols, 32 diodes + 2 inputs)
+ *      - make the LCD a part of a virtual screen of Vx*Vy
+ *	- make the inputs list smp-safe
+ *      - change the keyboard to a double mapping : signals -> key_id -> values
+ *        so that applications can change values without knowing signals
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/miscdevice.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/fcntl.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/ctype.h>
+#include <linux/parport.h>
+#include <linux/list.h>
+
+#include <linux/io.h>
+#include <linux/uaccess.h>
+
+#include <misc/charlcd.h>
+
+#define KEYPAD_MINOR		185
+
+#define LCD_MAXBYTES		256	/* max burst write */
+
+#define KEYPAD_BUFFER		64
+
+/* poll the keyboard this every second */
+#define INPUT_POLL_TIME		(HZ / 50)
+/* a key starts to repeat after this times INPUT_POLL_TIME */
+#define KEYPAD_REP_START	(10)
+/* a key repeats this times INPUT_POLL_TIME */
+#define KEYPAD_REP_DELAY	(2)
+
+/* converts an r_str() input to an active high, bits string : 000BAOSE */
+#define PNL_PINPUT(a)		((((unsigned char)(a)) ^ 0x7F) >> 3)
+
+#define PNL_PBUSY		0x80	/* inverted input, active low */
+#define PNL_PACK		0x40	/* direct input, active low */
+#define PNL_POUTPA		0x20	/* direct input, active high */
+#define PNL_PSELECD		0x10	/* direct input, active high */
+#define PNL_PERRORP		0x08	/* direct input, active low */
+
+#define PNL_PBIDIR		0x20	/* bi-directional ports */
+/* high to read data in or-ed with data out */
+#define PNL_PINTEN		0x10
+#define PNL_PSELECP		0x08	/* inverted output, active low */
+#define PNL_PINITP		0x04	/* direct output, active low */
+#define PNL_PAUTOLF		0x02	/* inverted output, active low */
+#define PNL_PSTROBE		0x01	/* inverted output */
+
+#define PNL_PD0			0x01
+#define PNL_PD1			0x02
+#define PNL_PD2			0x04
+#define PNL_PD3			0x08
+#define PNL_PD4			0x10
+#define PNL_PD5			0x20
+#define PNL_PD6			0x40
+#define PNL_PD7			0x80
+
+#define PIN_NONE		0
+#define PIN_STROBE		1
+#define PIN_D0			2
+#define PIN_D1			3
+#define PIN_D2			4
+#define PIN_D3			5
+#define PIN_D4			6
+#define PIN_D5			7
+#define PIN_D6			8
+#define PIN_D7			9
+#define PIN_AUTOLF		14
+#define PIN_INITP		16
+#define PIN_SELECP		17
+#define PIN_NOT_SET		127
+
+#define NOT_SET			-1
+
+/* macros to simplify use of the parallel port */
+#define r_ctr(x)        (parport_read_control((x)->port))
+#define r_dtr(x)        (parport_read_data((x)->port))
+#define r_str(x)        (parport_read_status((x)->port))
+#define w_ctr(x, y)     (parport_write_control((x)->port, (y)))
+#define w_dtr(x, y)     (parport_write_data((x)->port, (y)))
+
+/* this defines which bits are to be used and which ones to be ignored */
+/* logical or of the output bits involved in the scan matrix */
+static __u8 scan_mask_o;
+/* logical or of the input bits involved in the scan matrix */
+static __u8 scan_mask_i;
+
+enum input_type {
+	INPUT_TYPE_STD,
+	INPUT_TYPE_KBD,
+};
+
+enum input_state {
+	INPUT_ST_LOW,
+	INPUT_ST_RISING,
+	INPUT_ST_HIGH,
+	INPUT_ST_FALLING,
+};
+
+struct logical_input {
+	struct list_head list;
+	__u64 mask;
+	__u64 value;
+	enum input_type type;
+	enum input_state state;
+	__u8 rise_time, fall_time;
+	__u8 rise_timer, fall_timer, high_timer;
+
+	union {
+		struct {	/* valid when type == INPUT_TYPE_STD */
+			void (*press_fct)(int);
+			void (*release_fct)(int);
+			int press_data;
+			int release_data;
+		} std;
+		struct {	/* valid when type == INPUT_TYPE_KBD */
+			/* strings can be non null-terminated */
+			char press_str[sizeof(void *) + sizeof(int)];
+			char repeat_str[sizeof(void *) + sizeof(int)];
+			char release_str[sizeof(void *) + sizeof(int)];
+		} kbd;
+	} u;
+};
+
+static LIST_HEAD(logical_inputs);	/* list of all defined logical inputs */
+
+/* physical contacts history
+ * Physical contacts are a 45 bits string of 9 groups of 5 bits each.
+ * The 8 lower groups correspond to output bits 0 to 7, and the 9th group
+ * corresponds to the ground.
+ * Within each group, bits are stored in the same order as read on the port :
+ * BAPSE (busy=4, ack=3, paper empty=2, select=1, error=0).
+ * So, each __u64 is represented like this :
+ * 0000000000000000000BAPSEBAPSEBAPSEBAPSEBAPSEBAPSEBAPSEBAPSEBAPSE
+ * <-----unused------><gnd><d07><d06><d05><d04><d03><d02><d01><d00>
+ */
+
+/* what has just been read from the I/O ports */
+static __u64 phys_read;
+/* previous phys_read */
+static __u64 phys_read_prev;
+/* stabilized phys_read (phys_read|phys_read_prev) */
+static __u64 phys_curr;
+/* previous phys_curr */
+static __u64 phys_prev;
+/* 0 means that at least one logical signal needs be computed */
+static char inputs_stable;
+
+/* these variables are specific to the keypad */
+static struct {
+	bool enabled;
+} keypad;
+
+static char keypad_buffer[KEYPAD_BUFFER];
+static int keypad_buflen;
+static int keypad_start;
+static char keypressed;
+static wait_queue_head_t keypad_read_wait;
+
+/* lcd-specific variables */
+static struct {
+	bool enabled;
+	bool initialized;
+
+	int charset;
+	int proto;
+
+	/* TODO: use union here? */
+	struct {
+		int e;
+		int rs;
+		int rw;
+		int cl;
+		int da;
+		int bl;
+	} pins;
+
+	struct charlcd *charlcd;
+} lcd;
+
+/* Needed only for init */
+static int selected_lcd_type = NOT_SET;
+
+/*
+ * Bit masks to convert LCD signals to parallel port outputs.
+ * _d_ are values for data port, _c_ are for control port.
+ * [0] = signal OFF, [1] = signal ON, [2] = mask
+ */
+#define BIT_CLR		0
+#define BIT_SET		1
+#define BIT_MSK		2
+#define BIT_STATES	3
+/*
+ * one entry for each bit on the LCD
+ */
+#define LCD_BIT_E	0
+#define LCD_BIT_RS	1
+#define LCD_BIT_RW	2
+#define LCD_BIT_BL	3
+#define LCD_BIT_CL	4
+#define LCD_BIT_DA	5
+#define LCD_BITS	6
+
+/*
+ * each bit can be either connected to a DATA or CTRL port
+ */
+#define LCD_PORT_C	0
+#define LCD_PORT_D	1
+#define LCD_PORTS	2
+
+static unsigned char lcd_bits[LCD_PORTS][LCD_BITS][BIT_STATES];
+
+/*
+ * LCD protocols
+ */
+#define LCD_PROTO_PARALLEL      0
+#define LCD_PROTO_SERIAL        1
+#define LCD_PROTO_TI_DA8XX_LCD	2
+
+/*
+ * LCD character sets
+ */
+#define LCD_CHARSET_NORMAL      0
+#define LCD_CHARSET_KS0074      1
+
+/*
+ * LCD types
+ */
+#define LCD_TYPE_NONE		0
+#define LCD_TYPE_CUSTOM		1
+#define LCD_TYPE_OLD		2
+#define LCD_TYPE_KS0074		3
+#define LCD_TYPE_HANTRONIX	4
+#define LCD_TYPE_NEXCOM		5
+
+/*
+ * keypad types
+ */
+#define KEYPAD_TYPE_NONE	0
+#define KEYPAD_TYPE_OLD		1
+#define KEYPAD_TYPE_NEW		2
+#define KEYPAD_TYPE_NEXCOM	3
+
+/*
+ * panel profiles
+ */
+#define PANEL_PROFILE_CUSTOM	0
+#define PANEL_PROFILE_OLD	1
+#define PANEL_PROFILE_NEW	2
+#define PANEL_PROFILE_HANTRONIX	3
+#define PANEL_PROFILE_NEXCOM	4
+#define PANEL_PROFILE_LARGE	5
+
+/*
+ * Construct custom config from the kernel's configuration
+ */
+#define DEFAULT_PARPORT         0
+#define DEFAULT_PROFILE         PANEL_PROFILE_LARGE
+#define DEFAULT_KEYPAD_TYPE     KEYPAD_TYPE_OLD
+#define DEFAULT_LCD_TYPE        LCD_TYPE_OLD
+#define DEFAULT_LCD_HEIGHT      2
+#define DEFAULT_LCD_WIDTH       40
+#define DEFAULT_LCD_BWIDTH      40
+#define DEFAULT_LCD_HWIDTH      64
+#define DEFAULT_LCD_CHARSET     LCD_CHARSET_NORMAL
+#define DEFAULT_LCD_PROTO       LCD_PROTO_PARALLEL
+
+#define DEFAULT_LCD_PIN_E       PIN_AUTOLF
+#define DEFAULT_LCD_PIN_RS      PIN_SELECP
+#define DEFAULT_LCD_PIN_RW      PIN_INITP
+#define DEFAULT_LCD_PIN_SCL     PIN_STROBE
+#define DEFAULT_LCD_PIN_SDA     PIN_D0
+#define DEFAULT_LCD_PIN_BL      PIN_NOT_SET
+
+#ifdef CONFIG_PANEL_PARPORT
+#undef DEFAULT_PARPORT
+#define DEFAULT_PARPORT CONFIG_PANEL_PARPORT
+#endif
+
+#ifdef CONFIG_PANEL_PROFILE
+#undef DEFAULT_PROFILE
+#define DEFAULT_PROFILE CONFIG_PANEL_PROFILE
+#endif
+
+#if DEFAULT_PROFILE == 0	/* custom */
+#ifdef CONFIG_PANEL_KEYPAD
+#undef DEFAULT_KEYPAD_TYPE
+#define DEFAULT_KEYPAD_TYPE CONFIG_PANEL_KEYPAD
+#endif
+
+#ifdef CONFIG_PANEL_LCD
+#undef DEFAULT_LCD_TYPE
+#define DEFAULT_LCD_TYPE CONFIG_PANEL_LCD
+#endif
+
+#ifdef CONFIG_PANEL_LCD_HEIGHT
+#undef DEFAULT_LCD_HEIGHT
+#define DEFAULT_LCD_HEIGHT CONFIG_PANEL_LCD_HEIGHT
+#endif
+
+#ifdef CONFIG_PANEL_LCD_WIDTH
+#undef DEFAULT_LCD_WIDTH
+#define DEFAULT_LCD_WIDTH CONFIG_PANEL_LCD_WIDTH
+#endif
+
+#ifdef CONFIG_PANEL_LCD_BWIDTH
+#undef DEFAULT_LCD_BWIDTH
+#define DEFAULT_LCD_BWIDTH CONFIG_PANEL_LCD_BWIDTH
+#endif
+
+#ifdef CONFIG_PANEL_LCD_HWIDTH
+#undef DEFAULT_LCD_HWIDTH
+#define DEFAULT_LCD_HWIDTH CONFIG_PANEL_LCD_HWIDTH
+#endif
+
+#ifdef CONFIG_PANEL_LCD_CHARSET
+#undef DEFAULT_LCD_CHARSET
+#define DEFAULT_LCD_CHARSET CONFIG_PANEL_LCD_CHARSET
+#endif
+
+#ifdef CONFIG_PANEL_LCD_PROTO
+#undef DEFAULT_LCD_PROTO
+#define DEFAULT_LCD_PROTO CONFIG_PANEL_LCD_PROTO
+#endif
+
+#ifdef CONFIG_PANEL_LCD_PIN_E
+#undef DEFAULT_LCD_PIN_E
+#define DEFAULT_LCD_PIN_E CONFIG_PANEL_LCD_PIN_E
+#endif
+
+#ifdef CONFIG_PANEL_LCD_PIN_RS
+#undef DEFAULT_LCD_PIN_RS
+#define DEFAULT_LCD_PIN_RS CONFIG_PANEL_LCD_PIN_RS
+#endif
+
+#ifdef CONFIG_PANEL_LCD_PIN_RW
+#undef DEFAULT_LCD_PIN_RW
+#define DEFAULT_LCD_PIN_RW CONFIG_PANEL_LCD_PIN_RW
+#endif
+
+#ifdef CONFIG_PANEL_LCD_PIN_SCL
+#undef DEFAULT_LCD_PIN_SCL
+#define DEFAULT_LCD_PIN_SCL CONFIG_PANEL_LCD_PIN_SCL
+#endif
+
+#ifdef CONFIG_PANEL_LCD_PIN_SDA
+#undef DEFAULT_LCD_PIN_SDA
+#define DEFAULT_LCD_PIN_SDA CONFIG_PANEL_LCD_PIN_SDA
+#endif
+
+#ifdef CONFIG_PANEL_LCD_PIN_BL
+#undef DEFAULT_LCD_PIN_BL
+#define DEFAULT_LCD_PIN_BL CONFIG_PANEL_LCD_PIN_BL
+#endif
+
+#endif /* DEFAULT_PROFILE == 0 */
+
+/* global variables */
+
+/* Device single-open policy control */
+static atomic_t keypad_available = ATOMIC_INIT(1);
+
+static struct pardevice *pprt;
+
+static int keypad_initialized;
+
+static DEFINE_SPINLOCK(pprt_lock);
+static struct timer_list scan_timer;
+
+MODULE_DESCRIPTION("Generic parallel port LCD/Keypad driver");
+
+static int parport = DEFAULT_PARPORT;
+module_param(parport, int, 0000);
+MODULE_PARM_DESC(parport, "Parallel port index (0=lpt1, 1=lpt2, ...)");
+
+static int profile = DEFAULT_PROFILE;
+module_param(profile, int, 0000);
+MODULE_PARM_DESC(profile,
+		 "1=16x2 old kp; 2=serial 16x2, new kp; 3=16x2 hantronix; "
+		 "4=16x2 nexcom; default=40x2, old kp");
+
+static int keypad_type = NOT_SET;
+module_param(keypad_type, int, 0000);
+MODULE_PARM_DESC(keypad_type,
+		 "Keypad type: 0=none, 1=old 6 keys, 2=new 6+1 keys, 3=nexcom 4 keys");
+
+static int lcd_type = NOT_SET;
+module_param(lcd_type, int, 0000);
+MODULE_PARM_DESC(lcd_type,
+		 "LCD type: 0=none, 1=compiled-in, 2=old, 3=serial ks0074, 4=hantronix, 5=nexcom");
+
+static int lcd_height = NOT_SET;
+module_param(lcd_height, int, 0000);
+MODULE_PARM_DESC(lcd_height, "Number of lines on the LCD");
+
+static int lcd_width = NOT_SET;
+module_param(lcd_width, int, 0000);
+MODULE_PARM_DESC(lcd_width, "Number of columns on the LCD");
+
+static int lcd_bwidth = NOT_SET;	/* internal buffer width (usually 40) */
+module_param(lcd_bwidth, int, 0000);
+MODULE_PARM_DESC(lcd_bwidth, "Internal LCD line width (40)");
+
+static int lcd_hwidth = NOT_SET;	/* hardware buffer width (usually 64) */
+module_param(lcd_hwidth, int, 0000);
+MODULE_PARM_DESC(lcd_hwidth, "LCD line hardware address (64)");
+
+static int lcd_charset = NOT_SET;
+module_param(lcd_charset, int, 0000);
+MODULE_PARM_DESC(lcd_charset, "LCD character set: 0=standard, 1=KS0074");
+
+static int lcd_proto = NOT_SET;
+module_param(lcd_proto, int, 0000);
+MODULE_PARM_DESC(lcd_proto,
+		 "LCD communication: 0=parallel (//), 1=serial, 2=TI LCD Interface");
+
+/*
+ * These are the parallel port pins the LCD control signals are connected to.
+ * Set this to 0 if the signal is not used. Set it to its opposite value
+ * (negative) if the signal is negated. -MAXINT is used to indicate that the
+ * pin has not been explicitly specified.
+ *
+ * WARNING! no check will be performed about collisions with keypad !
+ */
+
+static int lcd_e_pin  = PIN_NOT_SET;
+module_param(lcd_e_pin, int, 0000);
+MODULE_PARM_DESC(lcd_e_pin,
+		 "# of the // port pin connected to LCD 'E' signal, with polarity (-17..17)");
+
+static int lcd_rs_pin = PIN_NOT_SET;
+module_param(lcd_rs_pin, int, 0000);
+MODULE_PARM_DESC(lcd_rs_pin,
+		 "# of the // port pin connected to LCD 'RS' signal, with polarity (-17..17)");
+
+static int lcd_rw_pin = PIN_NOT_SET;
+module_param(lcd_rw_pin, int, 0000);
+MODULE_PARM_DESC(lcd_rw_pin,
+		 "# of the // port pin connected to LCD 'RW' signal, with polarity (-17..17)");
+
+static int lcd_cl_pin = PIN_NOT_SET;
+module_param(lcd_cl_pin, int, 0000);
+MODULE_PARM_DESC(lcd_cl_pin,
+		 "# of the // port pin connected to serial LCD 'SCL' signal, with polarity (-17..17)");
+
+static int lcd_da_pin = PIN_NOT_SET;
+module_param(lcd_da_pin, int, 0000);
+MODULE_PARM_DESC(lcd_da_pin,
+		 "# of the // port pin connected to serial LCD 'SDA' signal, with polarity (-17..17)");
+
+static int lcd_bl_pin = PIN_NOT_SET;
+module_param(lcd_bl_pin, int, 0000);
+MODULE_PARM_DESC(lcd_bl_pin,
+		 "# of the // port pin connected to LCD backlight, with polarity (-17..17)");
+
+/* Deprecated module parameters - consider not using them anymore */
+
+static int lcd_enabled = NOT_SET;
+module_param(lcd_enabled, int, 0000);
+MODULE_PARM_DESC(lcd_enabled, "Deprecated option, use lcd_type instead");
+
+static int keypad_enabled = NOT_SET;
+module_param(keypad_enabled, int, 0000);
+MODULE_PARM_DESC(keypad_enabled, "Deprecated option, use keypad_type instead");
+
+/* for some LCD drivers (ks0074) we need a charset conversion table. */
+static const unsigned char lcd_char_conv_ks0074[256] = {
+	/*          0|8   1|9   2|A   3|B   4|C   5|D   6|E   7|F */
+	/* 0x00 */ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+	/* 0x08 */ 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+	/* 0x10 */ 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+	/* 0x18 */ 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
+	/* 0x20 */ 0x20, 0x21, 0x22, 0x23, 0xa2, 0x25, 0x26, 0x27,
+	/* 0x28 */ 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
+	/* 0x30 */ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
+	/* 0x38 */ 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
+	/* 0x40 */ 0xa0, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
+	/* 0x48 */ 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
+	/* 0x50 */ 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
+	/* 0x58 */ 0x58, 0x59, 0x5a, 0xfa, 0xfb, 0xfc, 0x1d, 0xc4,
+	/* 0x60 */ 0x96, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
+	/* 0x68 */ 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
+	/* 0x70 */ 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
+	/* 0x78 */ 0x78, 0x79, 0x7a, 0xfd, 0xfe, 0xff, 0xce, 0x20,
+	/* 0x80 */ 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+	/* 0x88 */ 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
+	/* 0x90 */ 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
+	/* 0x98 */ 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
+	/* 0xA0 */ 0x20, 0x40, 0xb1, 0xa1, 0x24, 0xa3, 0xfe, 0x5f,
+	/* 0xA8 */ 0x22, 0xc8, 0x61, 0x14, 0x97, 0x2d, 0xad, 0x96,
+	/* 0xB0 */ 0x80, 0x8c, 0x82, 0x83, 0x27, 0x8f, 0x86, 0xdd,
+	/* 0xB8 */ 0x2c, 0x81, 0x6f, 0x15, 0x8b, 0x8a, 0x84, 0x60,
+	/* 0xC0 */ 0xe2, 0xe2, 0xe2, 0x5b, 0x5b, 0xae, 0xbc, 0xa9,
+	/* 0xC8 */ 0xc5, 0xbf, 0xc6, 0xf1, 0xe3, 0xe3, 0xe3, 0xe3,
+	/* 0xD0 */ 0x44, 0x5d, 0xa8, 0xe4, 0xec, 0xec, 0x5c, 0x78,
+	/* 0xD8 */ 0xab, 0xa6, 0xe5, 0x5e, 0x5e, 0xe6, 0xaa, 0xbe,
+	/* 0xE0 */ 0x7f, 0xe7, 0xaf, 0x7b, 0x7b, 0xaf, 0xbd, 0xc8,
+	/* 0xE8 */ 0xa4, 0xa5, 0xc7, 0xf6, 0xa7, 0xe8, 0x69, 0x69,
+	/* 0xF0 */ 0xed, 0x7d, 0xa8, 0xe4, 0xec, 0x5c, 0x5c, 0x25,
+	/* 0xF8 */ 0xac, 0xa6, 0xea, 0xef, 0x7e, 0xeb, 0xb2, 0x79,
+};
+
+static const char old_keypad_profile[][4][9] = {
+	{"S0", "Left\n", "Left\n", ""},
+	{"S1", "Down\n", "Down\n", ""},
+	{"S2", "Up\n", "Up\n", ""},
+	{"S3", "Right\n", "Right\n", ""},
+	{"S4", "Esc\n", "Esc\n", ""},
+	{"S5", "Ret\n", "Ret\n", ""},
+	{"", "", "", ""}
+};
+
+/* signals, press, repeat, release */
+static const char new_keypad_profile[][4][9] = {
+	{"S0", "Left\n", "Left\n", ""},
+	{"S1", "Down\n", "Down\n", ""},
+	{"S2", "Up\n", "Up\n", ""},
+	{"S3", "Right\n", "Right\n", ""},
+	{"S4s5", "", "Esc\n", "Esc\n"},
+	{"s4S5", "", "Ret\n", "Ret\n"},
+	{"S4S5", "Help\n", "", ""},
+	/* add new signals above this line */
+	{"", "", "", ""}
+};
+
+/* signals, press, repeat, release */
+static const char nexcom_keypad_profile[][4][9] = {
+	{"a-p-e-", "Down\n", "Down\n", ""},
+	{"a-p-E-", "Ret\n", "Ret\n", ""},
+	{"a-P-E-", "Esc\n", "Esc\n", ""},
+	{"a-P-e-", "Up\n", "Up\n", ""},
+	/* add new signals above this line */
+	{"", "", "", ""}
+};
+
+static const char (*keypad_profile)[4][9] = old_keypad_profile;
+
+static DECLARE_BITMAP(bits, LCD_BITS);
+
+static void lcd_get_bits(unsigned int port, int *val)
+{
+	unsigned int bit, state;
+
+	for (bit = 0; bit < LCD_BITS; bit++) {
+		state = test_bit(bit, bits) ? BIT_SET : BIT_CLR;
+		*val &= lcd_bits[port][bit][BIT_MSK];
+		*val |= lcd_bits[port][bit][state];
+	}
+}
+
+/* sets data port bits according to current signals values */
+static int set_data_bits(void)
+{
+	int val;
+
+	val = r_dtr(pprt);
+	lcd_get_bits(LCD_PORT_D, &val);
+	w_dtr(pprt, val);
+	return val;
+}
+
+/* sets ctrl port bits according to current signals values */
+static int set_ctrl_bits(void)
+{
+	int val;
+
+	val = r_ctr(pprt);
+	lcd_get_bits(LCD_PORT_C, &val);
+	w_ctr(pprt, val);
+	return val;
+}
+
+/* sets ctrl & data port bits according to current signals values */
+static void panel_set_bits(void)
+{
+	set_data_bits();
+	set_ctrl_bits();
+}
+
+/*
+ * Converts a parallel port pin (from -25 to 25) to data and control ports
+ * masks, and data and control port bits. The signal will be considered
+ * unconnected if it's on pin 0 or an invalid pin (<-25 or >25).
+ *
+ * Result will be used this way :
+ *   out(dport, in(dport) & d_val[2] | d_val[signal_state])
+ *   out(cport, in(cport) & c_val[2] | c_val[signal_state])
+ */
+static void pin_to_bits(int pin, unsigned char *d_val, unsigned char *c_val)
+{
+	int d_bit, c_bit, inv;
+
+	d_val[0] = 0;
+	c_val[0] = 0;
+	d_val[1] = 0;
+	c_val[1] = 0;
+	d_val[2] = 0xFF;
+	c_val[2] = 0xFF;
+
+	if (pin == 0)
+		return;
+
+	inv = (pin < 0);
+	if (inv)
+		pin = -pin;
+
+	d_bit = 0;
+	c_bit = 0;
+
+	switch (pin) {
+	case PIN_STROBE:	/* strobe, inverted */
+		c_bit = PNL_PSTROBE;
+		inv = !inv;
+		break;
+	case PIN_D0...PIN_D7:	/* D0 - D7 = 2 - 9 */
+		d_bit = 1 << (pin - 2);
+		break;
+	case PIN_AUTOLF:	/* autofeed, inverted */
+		c_bit = PNL_PAUTOLF;
+		inv = !inv;
+		break;
+	case PIN_INITP:		/* init, direct */
+		c_bit = PNL_PINITP;
+		break;
+	case PIN_SELECP:	/* select_in, inverted */
+		c_bit = PNL_PSELECP;
+		inv = !inv;
+		break;
+	default:		/* unknown pin, ignore */
+		break;
+	}
+
+	if (c_bit) {
+		c_val[2] &= ~c_bit;
+		c_val[!inv] = c_bit;
+	} else if (d_bit) {
+		d_val[2] &= ~d_bit;
+		d_val[!inv] = d_bit;
+	}
+}
+
+/*
+ * send a serial byte to the LCD panel. The caller is responsible for locking
+ * if needed.
+ */
+static void lcd_send_serial(int byte)
+{
+	int bit;
+
+	/*
+	 * the data bit is set on D0, and the clock on STROBE.
+	 * LCD reads D0 on STROBE's rising edge.
+	 */
+	for (bit = 0; bit < 8; bit++) {
+		clear_bit(LCD_BIT_CL, bits);	/* CLK low */
+		panel_set_bits();
+		if (byte & 1) {
+			set_bit(LCD_BIT_DA, bits);
+		} else {
+			clear_bit(LCD_BIT_DA, bits);
+		}
+
+		panel_set_bits();
+		udelay(2);  /* maintain the data during 2 us before CLK up */
+		set_bit(LCD_BIT_CL, bits);	/* CLK high */
+		panel_set_bits();
+		udelay(1);  /* maintain the strobe during 1 us */
+		byte >>= 1;
+	}
+}
+
+/* turn the backlight on or off */
+static void lcd_backlight(struct charlcd *charlcd, int on)
+{
+	if (lcd.pins.bl == PIN_NONE)
+		return;
+
+	/* The backlight is activated by setting the AUTOFEED line to +5V  */
+	spin_lock_irq(&pprt_lock);
+	if (on)
+		set_bit(LCD_BIT_BL, bits);
+	else
+		clear_bit(LCD_BIT_BL, bits);
+	panel_set_bits();
+	spin_unlock_irq(&pprt_lock);
+}
+
+/* send a command to the LCD panel in serial mode */
+static void lcd_write_cmd_s(struct charlcd *charlcd, int cmd)
+{
+	spin_lock_irq(&pprt_lock);
+	lcd_send_serial(0x1F);	/* R/W=W, RS=0 */
+	lcd_send_serial(cmd & 0x0F);
+	lcd_send_serial((cmd >> 4) & 0x0F);
+	udelay(40);		/* the shortest command takes at least 40 us */
+	spin_unlock_irq(&pprt_lock);
+}
+
+/* send data to the LCD panel in serial mode */
+static void lcd_write_data_s(struct charlcd *charlcd, int data)
+{
+	spin_lock_irq(&pprt_lock);
+	lcd_send_serial(0x5F);	/* R/W=W, RS=1 */
+	lcd_send_serial(data & 0x0F);
+	lcd_send_serial((data >> 4) & 0x0F);
+	udelay(40);		/* the shortest data takes at least 40 us */
+	spin_unlock_irq(&pprt_lock);
+}
+
+/* send a command to the LCD panel in 8 bits parallel mode */
+static void lcd_write_cmd_p8(struct charlcd *charlcd, int cmd)
+{
+	spin_lock_irq(&pprt_lock);
+	/* present the data to the data port */
+	w_dtr(pprt, cmd);
+	udelay(20);	/* maintain the data during 20 us before the strobe */
+
+	set_bit(LCD_BIT_E, bits);
+	clear_bit(LCD_BIT_RS, bits);
+	clear_bit(LCD_BIT_RW, bits);
+	set_ctrl_bits();
+
+	udelay(40);	/* maintain the strobe during 40 us */
+
+	clear_bit(LCD_BIT_E, bits);
+	set_ctrl_bits();
+
+	udelay(120);	/* the shortest command takes at least 120 us */
+	spin_unlock_irq(&pprt_lock);
+}
+
+/* send data to the LCD panel in 8 bits parallel mode */
+static void lcd_write_data_p8(struct charlcd *charlcd, int data)
+{
+	spin_lock_irq(&pprt_lock);
+	/* present the data to the data port */
+	w_dtr(pprt, data);
+	udelay(20);	/* maintain the data during 20 us before the strobe */
+
+	set_bit(LCD_BIT_E, bits);
+	set_bit(LCD_BIT_RS, bits);
+	clear_bit(LCD_BIT_RW, bits);
+	set_ctrl_bits();
+
+	udelay(40);	/* maintain the strobe during 40 us */
+
+	clear_bit(LCD_BIT_E, bits);
+	set_ctrl_bits();
+
+	udelay(45);	/* the shortest data takes at least 45 us */
+	spin_unlock_irq(&pprt_lock);
+}
+
+/* send a command to the TI LCD panel */
+static void lcd_write_cmd_tilcd(struct charlcd *charlcd, int cmd)
+{
+	spin_lock_irq(&pprt_lock);
+	/* present the data to the control port */
+	w_ctr(pprt, cmd);
+	udelay(60);
+	spin_unlock_irq(&pprt_lock);
+}
+
+/* send data to the TI LCD panel */
+static void lcd_write_data_tilcd(struct charlcd *charlcd, int data)
+{
+	spin_lock_irq(&pprt_lock);
+	/* present the data to the data port */
+	w_dtr(pprt, data);
+	udelay(60);
+	spin_unlock_irq(&pprt_lock);
+}
+
+/* fills the display with spaces and resets X/Y */
+static void lcd_clear_fast_s(struct charlcd *charlcd)
+{
+	int pos;
+
+	spin_lock_irq(&pprt_lock);
+	for (pos = 0; pos < charlcd->height * charlcd->hwidth; pos++) {
+		lcd_send_serial(0x5F);	/* R/W=W, RS=1 */
+		lcd_send_serial(' ' & 0x0F);
+		lcd_send_serial((' ' >> 4) & 0x0F);
+		/* the shortest data takes at least 40 us */
+		udelay(40);
+	}
+	spin_unlock_irq(&pprt_lock);
+}
+
+/* fills the display with spaces and resets X/Y */
+static void lcd_clear_fast_p8(struct charlcd *charlcd)
+{
+	int pos;
+
+	spin_lock_irq(&pprt_lock);
+	for (pos = 0; pos < charlcd->height * charlcd->hwidth; pos++) {
+		/* present the data to the data port */
+		w_dtr(pprt, ' ');
+
+		/* maintain the data during 20 us before the strobe */
+		udelay(20);
+
+		set_bit(LCD_BIT_E, bits);
+		set_bit(LCD_BIT_RS, bits);
+		clear_bit(LCD_BIT_RW, bits);
+		set_ctrl_bits();
+
+		/* maintain the strobe during 40 us */
+		udelay(40);
+
+		clear_bit(LCD_BIT_E, bits);
+		set_ctrl_bits();
+
+		/* the shortest data takes at least 45 us */
+		udelay(45);
+	}
+	spin_unlock_irq(&pprt_lock);
+}
+
+/* fills the display with spaces and resets X/Y */
+static void lcd_clear_fast_tilcd(struct charlcd *charlcd)
+{
+	int pos;
+
+	spin_lock_irq(&pprt_lock);
+	for (pos = 0; pos < charlcd->height * charlcd->hwidth; pos++) {
+		/* present the data to the data port */
+		w_dtr(pprt, ' ');
+		udelay(60);
+	}
+
+	spin_unlock_irq(&pprt_lock);
+}
+
+static struct charlcd_ops charlcd_serial_ops = {
+	.write_cmd	= lcd_write_cmd_s,
+	.write_data	= lcd_write_data_s,
+	.clear_fast	= lcd_clear_fast_s,
+	.backlight	= lcd_backlight,
+};
+
+static struct charlcd_ops charlcd_parallel_ops = {
+	.write_cmd	= lcd_write_cmd_p8,
+	.write_data	= lcd_write_data_p8,
+	.clear_fast	= lcd_clear_fast_p8,
+	.backlight	= lcd_backlight,
+};
+
+static struct charlcd_ops charlcd_tilcd_ops = {
+	.write_cmd	= lcd_write_cmd_tilcd,
+	.write_data	= lcd_write_data_tilcd,
+	.clear_fast	= lcd_clear_fast_tilcd,
+	.backlight	= lcd_backlight,
+};
+
+/* initialize the LCD driver */
+static void lcd_init(void)
+{
+	struct charlcd *charlcd;
+
+	charlcd = charlcd_alloc(0);
+	if (!charlcd)
+		return;
+
+	/*
+	 * Init lcd struct with load-time values to preserve exact
+	 * current functionality (at least for now).
+	 */
+	charlcd->height = lcd_height;
+	charlcd->width = lcd_width;
+	charlcd->bwidth = lcd_bwidth;
+	charlcd->hwidth = lcd_hwidth;
+
+	switch (selected_lcd_type) {
+	case LCD_TYPE_OLD:
+		/* parallel mode, 8 bits */
+		lcd.proto = LCD_PROTO_PARALLEL;
+		lcd.charset = LCD_CHARSET_NORMAL;
+		lcd.pins.e = PIN_STROBE;
+		lcd.pins.rs = PIN_AUTOLF;
+
+		charlcd->width = 40;
+		charlcd->bwidth = 40;
+		charlcd->hwidth = 64;
+		charlcd->height = 2;
+		break;
+	case LCD_TYPE_KS0074:
+		/* serial mode, ks0074 */
+		lcd.proto = LCD_PROTO_SERIAL;
+		lcd.charset = LCD_CHARSET_KS0074;
+		lcd.pins.bl = PIN_AUTOLF;
+		lcd.pins.cl = PIN_STROBE;
+		lcd.pins.da = PIN_D0;
+
+		charlcd->width = 16;
+		charlcd->bwidth = 40;
+		charlcd->hwidth = 16;
+		charlcd->height = 2;
+		break;
+	case LCD_TYPE_NEXCOM:
+		/* parallel mode, 8 bits, generic */
+		lcd.proto = LCD_PROTO_PARALLEL;
+		lcd.charset = LCD_CHARSET_NORMAL;
+		lcd.pins.e = PIN_AUTOLF;
+		lcd.pins.rs = PIN_SELECP;
+		lcd.pins.rw = PIN_INITP;
+
+		charlcd->width = 16;
+		charlcd->bwidth = 40;
+		charlcd->hwidth = 64;
+		charlcd->height = 2;
+		break;
+	case LCD_TYPE_CUSTOM:
+		/* customer-defined */
+		lcd.proto = DEFAULT_LCD_PROTO;
+		lcd.charset = DEFAULT_LCD_CHARSET;
+		/* default geometry will be set later */
+		break;
+	case LCD_TYPE_HANTRONIX:
+		/* parallel mode, 8 bits, hantronix-like */
+	default:
+		lcd.proto = LCD_PROTO_PARALLEL;
+		lcd.charset = LCD_CHARSET_NORMAL;
+		lcd.pins.e = PIN_STROBE;
+		lcd.pins.rs = PIN_SELECP;
+
+		charlcd->width = 16;
+		charlcd->bwidth = 40;
+		charlcd->hwidth = 64;
+		charlcd->height = 2;
+		break;
+	}
+
+	/* Overwrite with module params set on loading */
+	if (lcd_height != NOT_SET)
+		charlcd->height = lcd_height;
+	if (lcd_width != NOT_SET)
+		charlcd->width = lcd_width;
+	if (lcd_bwidth != NOT_SET)
+		charlcd->bwidth = lcd_bwidth;
+	if (lcd_hwidth != NOT_SET)
+		charlcd->hwidth = lcd_hwidth;
+	if (lcd_charset != NOT_SET)
+		lcd.charset = lcd_charset;
+	if (lcd_proto != NOT_SET)
+		lcd.proto = lcd_proto;
+	if (lcd_e_pin != PIN_NOT_SET)
+		lcd.pins.e = lcd_e_pin;
+	if (lcd_rs_pin != PIN_NOT_SET)
+		lcd.pins.rs = lcd_rs_pin;
+	if (lcd_rw_pin != PIN_NOT_SET)
+		lcd.pins.rw = lcd_rw_pin;
+	if (lcd_cl_pin != PIN_NOT_SET)
+		lcd.pins.cl = lcd_cl_pin;
+	if (lcd_da_pin != PIN_NOT_SET)
+		lcd.pins.da = lcd_da_pin;
+	if (lcd_bl_pin != PIN_NOT_SET)
+		lcd.pins.bl = lcd_bl_pin;
+
+	/* this is used to catch wrong and default values */
+	if (charlcd->width <= 0)
+		charlcd->width = DEFAULT_LCD_WIDTH;
+	if (charlcd->bwidth <= 0)
+		charlcd->bwidth = DEFAULT_LCD_BWIDTH;
+	if (charlcd->hwidth <= 0)
+		charlcd->hwidth = DEFAULT_LCD_HWIDTH;
+	if (charlcd->height <= 0)
+		charlcd->height = DEFAULT_LCD_HEIGHT;
+
+	if (lcd.proto == LCD_PROTO_SERIAL) {	/* SERIAL */
+		charlcd->ops = &charlcd_serial_ops;
+
+		if (lcd.pins.cl == PIN_NOT_SET)
+			lcd.pins.cl = DEFAULT_LCD_PIN_SCL;
+		if (lcd.pins.da == PIN_NOT_SET)
+			lcd.pins.da = DEFAULT_LCD_PIN_SDA;
+
+	} else if (lcd.proto == LCD_PROTO_PARALLEL) {	/* PARALLEL */
+		charlcd->ops = &charlcd_parallel_ops;
+
+		if (lcd.pins.e == PIN_NOT_SET)
+			lcd.pins.e = DEFAULT_LCD_PIN_E;
+		if (lcd.pins.rs == PIN_NOT_SET)
+			lcd.pins.rs = DEFAULT_LCD_PIN_RS;
+		if (lcd.pins.rw == PIN_NOT_SET)
+			lcd.pins.rw = DEFAULT_LCD_PIN_RW;
+	} else {
+		charlcd->ops = &charlcd_tilcd_ops;
+	}
+
+	if (lcd.pins.bl == PIN_NOT_SET)
+		lcd.pins.bl = DEFAULT_LCD_PIN_BL;
+
+	if (lcd.pins.e == PIN_NOT_SET)
+		lcd.pins.e = PIN_NONE;
+	if (lcd.pins.rs == PIN_NOT_SET)
+		lcd.pins.rs = PIN_NONE;
+	if (lcd.pins.rw == PIN_NOT_SET)
+		lcd.pins.rw = PIN_NONE;
+	if (lcd.pins.bl == PIN_NOT_SET)
+		lcd.pins.bl = PIN_NONE;
+	if (lcd.pins.cl == PIN_NOT_SET)
+		lcd.pins.cl = PIN_NONE;
+	if (lcd.pins.da == PIN_NOT_SET)
+		lcd.pins.da = PIN_NONE;
+
+	if (lcd.charset == NOT_SET)
+		lcd.charset = DEFAULT_LCD_CHARSET;
+
+	if (lcd.charset == LCD_CHARSET_KS0074)
+		charlcd->char_conv = lcd_char_conv_ks0074;
+	else
+		charlcd->char_conv = NULL;
+
+	pin_to_bits(lcd.pins.e, lcd_bits[LCD_PORT_D][LCD_BIT_E],
+		    lcd_bits[LCD_PORT_C][LCD_BIT_E]);
+	pin_to_bits(lcd.pins.rs, lcd_bits[LCD_PORT_D][LCD_BIT_RS],
+		    lcd_bits[LCD_PORT_C][LCD_BIT_RS]);
+	pin_to_bits(lcd.pins.rw, lcd_bits[LCD_PORT_D][LCD_BIT_RW],
+		    lcd_bits[LCD_PORT_C][LCD_BIT_RW]);
+	pin_to_bits(lcd.pins.bl, lcd_bits[LCD_PORT_D][LCD_BIT_BL],
+		    lcd_bits[LCD_PORT_C][LCD_BIT_BL]);
+	pin_to_bits(lcd.pins.cl, lcd_bits[LCD_PORT_D][LCD_BIT_CL],
+		    lcd_bits[LCD_PORT_C][LCD_BIT_CL]);
+	pin_to_bits(lcd.pins.da, lcd_bits[LCD_PORT_D][LCD_BIT_DA],
+		    lcd_bits[LCD_PORT_C][LCD_BIT_DA]);
+
+	lcd.charlcd = charlcd;
+	lcd.initialized = true;
+}
+
+/*
+ * These are the file operation function for user access to /dev/keypad
+ */
+
+static ssize_t keypad_read(struct file *file,
+			   char __user *buf, size_t count, loff_t *ppos)
+{
+	unsigned i = *ppos;
+	char __user *tmp = buf;
+
+	if (keypad_buflen == 0) {
+		if (file->f_flags & O_NONBLOCK)
+			return -EAGAIN;
+
+		if (wait_event_interruptible(keypad_read_wait,
+					     keypad_buflen != 0))
+			return -EINTR;
+	}
+
+	for (; count-- > 0 && (keypad_buflen > 0);
+	     ++i, ++tmp, --keypad_buflen) {
+		put_user(keypad_buffer[keypad_start], tmp);
+		keypad_start = (keypad_start + 1) % KEYPAD_BUFFER;
+	}
+	*ppos = i;
+
+	return tmp - buf;
+}
+
+static int keypad_open(struct inode *inode, struct file *file)
+{
+	if (!atomic_dec_and_test(&keypad_available))
+		return -EBUSY;	/* open only once at a time */
+
+	if (file->f_mode & FMODE_WRITE)	/* device is read-only */
+		return -EPERM;
+
+	keypad_buflen = 0;	/* flush the buffer on opening */
+	return 0;
+}
+
+static int keypad_release(struct inode *inode, struct file *file)
+{
+	atomic_inc(&keypad_available);
+	return 0;
+}
+
+static const struct file_operations keypad_fops = {
+	.read    = keypad_read,		/* read */
+	.open    = keypad_open,		/* open */
+	.release = keypad_release,	/* close */
+	.llseek  = default_llseek,
+};
+
+static struct miscdevice keypad_dev = {
+	.minor	= KEYPAD_MINOR,
+	.name	= "keypad",
+	.fops	= &keypad_fops,
+};
+
+static void keypad_send_key(const char *string, int max_len)
+{
+	/* send the key to the device only if a process is attached to it. */
+	if (!atomic_read(&keypad_available)) {
+		while (max_len-- && keypad_buflen < KEYPAD_BUFFER && *string) {
+			keypad_buffer[(keypad_start + keypad_buflen++) %
+				      KEYPAD_BUFFER] = *string++;
+		}
+		wake_up_interruptible(&keypad_read_wait);
+	}
+}
+
+/* this function scans all the bits involving at least one logical signal,
+ * and puts the results in the bitfield "phys_read" (one bit per established
+ * contact), and sets "phys_read_prev" to "phys_read".
+ *
+ * Note: to debounce input signals, we will only consider as switched a signal
+ * which is stable across 2 measures. Signals which are different between two
+ * reads will be kept as they previously were in their logical form (phys_prev).
+ * A signal which has just switched will have a 1 in
+ * (phys_read ^ phys_read_prev).
+ */
+static void phys_scan_contacts(void)
+{
+	int bit, bitval;
+	char oldval;
+	char bitmask;
+	char gndmask;
+
+	phys_prev = phys_curr;
+	phys_read_prev = phys_read;
+	phys_read = 0;		/* flush all signals */
+
+	/* keep track of old value, with all outputs disabled */
+	oldval = r_dtr(pprt) | scan_mask_o;
+	/* activate all keyboard outputs (active low) */
+	w_dtr(pprt, oldval & ~scan_mask_o);
+
+	/* will have a 1 for each bit set to gnd */
+	bitmask = PNL_PINPUT(r_str(pprt)) & scan_mask_i;
+	/* disable all matrix signals */
+	w_dtr(pprt, oldval);
+
+	/* now that all outputs are cleared, the only active input bits are
+	 * directly connected to the ground
+	 */
+
+	/* 1 for each grounded input */
+	gndmask = PNL_PINPUT(r_str(pprt)) & scan_mask_i;
+
+	/* grounded inputs are signals 40-44 */
+	phys_read |= (__u64)gndmask << 40;
+
+	if (bitmask != gndmask) {
+		/*
+		 * since clearing the outputs changed some inputs, we know
+		 * that some input signals are currently tied to some outputs.
+		 * So we'll scan them.
+		 */
+		for (bit = 0; bit < 8; bit++) {
+			bitval = BIT(bit);
+
+			if (!(scan_mask_o & bitval))	/* skip unused bits */
+				continue;
+
+			w_dtr(pprt, oldval & ~bitval);	/* enable this output */
+			bitmask = PNL_PINPUT(r_str(pprt)) & ~gndmask;
+			phys_read |= (__u64)bitmask << (5 * bit);
+		}
+		w_dtr(pprt, oldval);	/* disable all outputs */
+	}
+	/*
+	 * this is easy: use old bits when they are flapping,
+	 * use new ones when stable
+	 */
+	phys_curr = (phys_prev & (phys_read ^ phys_read_prev)) |
+		    (phys_read & ~(phys_read ^ phys_read_prev));
+}
+
+static inline int input_state_high(struct logical_input *input)
+{
+#if 0
+	/* FIXME:
+	 * this is an invalid test. It tries to catch
+	 * transitions from single-key to multiple-key, but
+	 * doesn't take into account the contacts polarity.
+	 * The only solution to the problem is to parse keys
+	 * from the most complex to the simplest combinations,
+	 * and mark them as 'caught' once a combination
+	 * matches, then unmatch it for all other ones.
+	 */
+
+	/* try to catch dangerous transitions cases :
+	 * someone adds a bit, so this signal was a false
+	 * positive resulting from a transition. We should
+	 * invalidate the signal immediately and not call the
+	 * release function.
+	 * eg: 0 -(press A)-> A -(press B)-> AB : don't match A's release.
+	 */
+	if (((phys_prev & input->mask) == input->value) &&
+	    ((phys_curr & input->mask) >  input->value)) {
+		input->state = INPUT_ST_LOW; /* invalidate */
+		return 1;
+	}
+#endif
+
+	if ((phys_curr & input->mask) == input->value) {
+		if ((input->type == INPUT_TYPE_STD) &&
+		    (input->high_timer == 0)) {
+			input->high_timer++;
+			if (input->u.std.press_fct)
+				input->u.std.press_fct(input->u.std.press_data);
+		} else if (input->type == INPUT_TYPE_KBD) {
+			/* will turn on the light */
+			keypressed = 1;
+
+			if (input->high_timer == 0) {
+				char *press_str = input->u.kbd.press_str;
+
+				if (press_str[0]) {
+					int s = sizeof(input->u.kbd.press_str);
+
+					keypad_send_key(press_str, s);
+				}
+			}
+
+			if (input->u.kbd.repeat_str[0]) {
+				char *repeat_str = input->u.kbd.repeat_str;
+
+				if (input->high_timer >= KEYPAD_REP_START) {
+					int s = sizeof(input->u.kbd.repeat_str);
+
+					input->high_timer -= KEYPAD_REP_DELAY;
+					keypad_send_key(repeat_str, s);
+				}
+				/* we will need to come back here soon */
+				inputs_stable = 0;
+			}
+
+			if (input->high_timer < 255)
+				input->high_timer++;
+		}
+		return 1;
+	}
+
+	/* else signal falling down. Let's fall through. */
+	input->state = INPUT_ST_FALLING;
+	input->fall_timer = 0;
+
+	return 0;
+}
+
+static inline void input_state_falling(struct logical_input *input)
+{
+#if 0
+	/* FIXME !!! same comment as in input_state_high */
+	if (((phys_prev & input->mask) == input->value) &&
+	    ((phys_curr & input->mask) >  input->value)) {
+		input->state = INPUT_ST_LOW;	/* invalidate */
+		return;
+	}
+#endif
+
+	if ((phys_curr & input->mask) == input->value) {
+		if (input->type == INPUT_TYPE_KBD) {
+			/* will turn on the light */
+			keypressed = 1;
+
+			if (input->u.kbd.repeat_str[0]) {
+				char *repeat_str = input->u.kbd.repeat_str;
+
+				if (input->high_timer >= KEYPAD_REP_START) {
+					int s = sizeof(input->u.kbd.repeat_str);
+
+					input->high_timer -= KEYPAD_REP_DELAY;
+					keypad_send_key(repeat_str, s);
+				}
+				/* we will need to come back here soon */
+				inputs_stable = 0;
+			}
+
+			if (input->high_timer < 255)
+				input->high_timer++;
+		}
+		input->state = INPUT_ST_HIGH;
+	} else if (input->fall_timer >= input->fall_time) {
+		/* call release event */
+		if (input->type == INPUT_TYPE_STD) {
+			void (*release_fct)(int) = input->u.std.release_fct;
+
+			if (release_fct)
+				release_fct(input->u.std.release_data);
+		} else if (input->type == INPUT_TYPE_KBD) {
+			char *release_str = input->u.kbd.release_str;
+
+			if (release_str[0]) {
+				int s = sizeof(input->u.kbd.release_str);
+
+				keypad_send_key(release_str, s);
+			}
+		}
+
+		input->state = INPUT_ST_LOW;
+	} else {
+		input->fall_timer++;
+		inputs_stable = 0;
+	}
+}
+
+static void panel_process_inputs(void)
+{
+	struct list_head *item;
+	struct logical_input *input;
+
+	keypressed = 0;
+	inputs_stable = 1;
+	list_for_each(item, &logical_inputs) {
+		input = list_entry(item, struct logical_input, list);
+
+		switch (input->state) {
+		case INPUT_ST_LOW:
+			if ((phys_curr & input->mask) != input->value)
+				break;
+			/* if all needed ones were already set previously,
+			 * this means that this logical signal has been
+			 * activated by the releasing of another combined
+			 * signal, so we don't want to match.
+			 * eg: AB -(release B)-> A -(release A)-> 0 :
+			 *     don't match A.
+			 */
+			if ((phys_prev & input->mask) == input->value)
+				break;
+			input->rise_timer = 0;
+			input->state = INPUT_ST_RISING;
+			/* no break here, fall through */
+		case INPUT_ST_RISING:
+			if ((phys_curr & input->mask) != input->value) {
+				input->state = INPUT_ST_LOW;
+				break;
+			}
+			if (input->rise_timer < input->rise_time) {
+				inputs_stable = 0;
+				input->rise_timer++;
+				break;
+			}
+			input->high_timer = 0;
+			input->state = INPUT_ST_HIGH;
+			/* no break here, fall through */
+		case INPUT_ST_HIGH:
+			if (input_state_high(input))
+				break;
+			/* no break here, fall through */
+		case INPUT_ST_FALLING:
+			input_state_falling(input);
+		}
+	}
+}
+
+static void panel_scan_timer(void)
+{
+	if (keypad.enabled && keypad_initialized) {
+		if (spin_trylock_irq(&pprt_lock)) {
+			phys_scan_contacts();
+
+			/* no need for the parport anymore */
+			spin_unlock_irq(&pprt_lock);
+		}
+
+		if (!inputs_stable || phys_curr != phys_prev)
+			panel_process_inputs();
+	}
+
+	if (keypressed && lcd.enabled && lcd.initialized)
+		charlcd_poke(lcd.charlcd);
+
+	mod_timer(&scan_timer, jiffies + INPUT_POLL_TIME);
+}
+
+static void init_scan_timer(void)
+{
+	if (scan_timer.function)
+		return;		/* already started */
+
+	setup_timer(&scan_timer, (void *)&panel_scan_timer, 0);
+	scan_timer.expires = jiffies + INPUT_POLL_TIME;
+	add_timer(&scan_timer);
+}
+
+/* converts a name of the form "({BbAaPpSsEe}{01234567-})*" to a series of bits.
+ * if <omask> or <imask> are non-null, they will be or'ed with the bits
+ * corresponding to out and in bits respectively.
+ * returns 1 if ok, 0 if error (in which case, nothing is written).
+ */
+static u8 input_name2mask(const char *name, __u64 *mask, __u64 *value,
+			  u8 *imask, u8 *omask)
+{
+	const char sigtab[] = "EeSsPpAaBb";
+	u8 im, om;
+	__u64 m, v;
+
+	om = 0;
+	im = 0;
+	m = 0ULL;
+	v = 0ULL;
+	while (*name) {
+		int in, out, bit, neg;
+		const char *idx;
+
+		idx = strchr(sigtab, *name);
+		if (!idx)
+			return 0;	/* input name not found */
+
+		in = idx - sigtab;
+		neg = (in & 1);	/* odd (lower) names are negated */
+		in >>= 1;
+		im |= BIT(in);
+
+		name++;
+		if (*name >= '0' && *name <= '7') {
+			out = *name - '0';
+			om |= BIT(out);
+		} else if (*name == '-') {
+			out = 8;
+		} else {
+			return 0;	/* unknown bit name */
+		}
+
+		bit = (out * 5) + in;
+
+		m |= 1ULL << bit;
+		if (!neg)
+			v |= 1ULL << bit;
+		name++;
+	}
+	*mask = m;
+	*value = v;
+	if (imask)
+		*imask |= im;
+	if (omask)
+		*omask |= om;
+	return 1;
+}
+
+/* tries to bind a key to the signal name <name>. The key will send the
+ * strings <press>, <repeat>, <release> for these respective events.
+ * Returns the pointer to the new key if ok, NULL if the key could not be bound.
+ */
+static struct logical_input *panel_bind_key(const char *name, const char *press,
+					    const char *repeat,
+					    const char *release)
+{
+	struct logical_input *key;
+
+	key = kzalloc(sizeof(*key), GFP_KERNEL);
+	if (!key)
+		return NULL;
+
+	if (!input_name2mask(name, &key->mask, &key->value, &scan_mask_i,
+			     &scan_mask_o)) {
+		kfree(key);
+		return NULL;
+	}
+
+	key->type = INPUT_TYPE_KBD;
+	key->state = INPUT_ST_LOW;
+	key->rise_time = 1;
+	key->fall_time = 1;
+
+	strncpy(key->u.kbd.press_str, press, sizeof(key->u.kbd.press_str));
+	strncpy(key->u.kbd.repeat_str, repeat, sizeof(key->u.kbd.repeat_str));
+	strncpy(key->u.kbd.release_str, release,
+		sizeof(key->u.kbd.release_str));
+	list_add(&key->list, &logical_inputs);
+	return key;
+}
+
+#if 0
+/* tries to bind a callback function to the signal name <name>. The function
+ * <press_fct> will be called with the <press_data> arg when the signal is
+ * activated, and so on for <release_fct>/<release_data>
+ * Returns the pointer to the new signal if ok, NULL if the signal could not
+ * be bound.
+ */
+static struct logical_input *panel_bind_callback(char *name,
+						 void (*press_fct)(int),
+						 int press_data,
+						 void (*release_fct)(int),
+						 int release_data)
+{
+	struct logical_input *callback;
+
+	callback = kmalloc(sizeof(*callback), GFP_KERNEL);
+	if (!callback)
+		return NULL;
+
+	memset(callback, 0, sizeof(struct logical_input));
+	if (!input_name2mask(name, &callback->mask, &callback->value,
+			     &scan_mask_i, &scan_mask_o))
+		return NULL;
+
+	callback->type = INPUT_TYPE_STD;
+	callback->state = INPUT_ST_LOW;
+	callback->rise_time = 1;
+	callback->fall_time = 1;
+	callback->u.std.press_fct = press_fct;
+	callback->u.std.press_data = press_data;
+	callback->u.std.release_fct = release_fct;
+	callback->u.std.release_data = release_data;
+	list_add(&callback->list, &logical_inputs);
+	return callback;
+}
+#endif
+
+static void keypad_init(void)
+{
+	int keynum;
+
+	init_waitqueue_head(&keypad_read_wait);
+	keypad_buflen = 0;	/* flushes any eventual noisy keystroke */
+
+	/* Let's create all known keys */
+
+	for (keynum = 0; keypad_profile[keynum][0][0]; keynum++) {
+		panel_bind_key(keypad_profile[keynum][0],
+			       keypad_profile[keynum][1],
+			       keypad_profile[keynum][2],
+			       keypad_profile[keynum][3]);
+	}
+
+	init_scan_timer();
+	keypad_initialized = 1;
+}
+
+/**************************************************/
+/* device initialization                          */
+/**************************************************/
+
+static void panel_attach(struct parport *port)
+{
+	struct pardev_cb panel_cb;
+
+	if (port->number != parport)
+		return;
+
+	if (pprt) {
+		pr_err("%s: port->number=%d parport=%d, already registered!\n",
+		       __func__, port->number, parport);
+		return;
+	}
+
+	memset(&panel_cb, 0, sizeof(panel_cb));
+	panel_cb.private = &pprt;
+	/* panel_cb.flags = 0 should be PARPORT_DEV_EXCL? */
+
+	pprt = parport_register_dev_model(port, "panel", &panel_cb, 0);
+	if (!pprt) {
+		pr_err("%s: port->number=%d parport=%d, parport_register_device() failed\n",
+		       __func__, port->number, parport);
+		return;
+	}
+
+	if (parport_claim(pprt)) {
+		pr_err("could not claim access to parport%d. Aborting.\n",
+		       parport);
+		goto err_unreg_device;
+	}
+
+	/* must init LCD first, just in case an IRQ from the keypad is
+	 * generated at keypad init
+	 */
+	if (lcd.enabled) {
+		lcd_init();
+		if (!lcd.charlcd || charlcd_register(lcd.charlcd))
+			goto err_unreg_device;
+	}
+
+	if (keypad.enabled) {
+		keypad_init();
+		if (misc_register(&keypad_dev))
+			goto err_lcd_unreg;
+	}
+	return;
+
+err_lcd_unreg:
+	if (lcd.enabled)
+		charlcd_unregister(lcd.charlcd);
+err_unreg_device:
+	kfree(lcd.charlcd);
+	lcd.charlcd = NULL;
+	parport_unregister_device(pprt);
+	pprt = NULL;
+}
+
+static void panel_detach(struct parport *port)
+{
+	if (port->number != parport)
+		return;
+
+	if (!pprt) {
+		pr_err("%s: port->number=%d parport=%d, nothing to unregister.\n",
+		       __func__, port->number, parport);
+		return;
+	}
+	if (scan_timer.function)
+		del_timer_sync(&scan_timer);
+
+	if (keypad.enabled) {
+		misc_deregister(&keypad_dev);
+		keypad_initialized = 0;
+	}
+
+	if (lcd.enabled) {
+		charlcd_unregister(lcd.charlcd);
+		lcd.initialized = false;
+		kfree(lcd.charlcd);
+		lcd.charlcd = NULL;
+	}
+
+	/* TODO: free all input signals */
+	parport_release(pprt);
+	parport_unregister_device(pprt);
+	pprt = NULL;
+}
+
+static struct parport_driver panel_driver = {
+	.name = "panel",
+	.match_port = panel_attach,
+	.detach = panel_detach,
+	.devmodel = true,
+};
+
+/* init function */
+static int __init panel_init_module(void)
+{
+	int selected_keypad_type = NOT_SET, err;
+
+	/* take care of an eventual profile */
+	switch (profile) {
+	case PANEL_PROFILE_CUSTOM:
+		/* custom profile */
+		selected_keypad_type = DEFAULT_KEYPAD_TYPE;
+		selected_lcd_type = DEFAULT_LCD_TYPE;
+		break;
+	case PANEL_PROFILE_OLD:
+		/* 8 bits, 2*16, old keypad */
+		selected_keypad_type = KEYPAD_TYPE_OLD;
+		selected_lcd_type = LCD_TYPE_OLD;
+
+		/* TODO: This two are a little hacky, sort it out later */
+		if (lcd_width == NOT_SET)
+			lcd_width = 16;
+		if (lcd_hwidth == NOT_SET)
+			lcd_hwidth = 16;
+		break;
+	case PANEL_PROFILE_NEW:
+		/* serial, 2*16, new keypad */
+		selected_keypad_type = KEYPAD_TYPE_NEW;
+		selected_lcd_type = LCD_TYPE_KS0074;
+		break;
+	case PANEL_PROFILE_HANTRONIX:
+		/* 8 bits, 2*16 hantronix-like, no keypad */
+		selected_keypad_type = KEYPAD_TYPE_NONE;
+		selected_lcd_type = LCD_TYPE_HANTRONIX;
+		break;
+	case PANEL_PROFILE_NEXCOM:
+		/* generic 8 bits, 2*16, nexcom keypad, eg. Nexcom. */
+		selected_keypad_type = KEYPAD_TYPE_NEXCOM;
+		selected_lcd_type = LCD_TYPE_NEXCOM;
+		break;
+	case PANEL_PROFILE_LARGE:
+		/* 8 bits, 2*40, old keypad */
+		selected_keypad_type = KEYPAD_TYPE_OLD;
+		selected_lcd_type = LCD_TYPE_OLD;
+		break;
+	}
+
+	/*
+	 * Overwrite selection with module param values (both keypad and lcd),
+	 * where the deprecated params have lower prio.
+	 */
+	if (keypad_enabled != NOT_SET)
+		selected_keypad_type = keypad_enabled;
+	if (keypad_type != NOT_SET)
+		selected_keypad_type = keypad_type;
+
+	keypad.enabled = (selected_keypad_type > 0);
+
+	if (lcd_enabled != NOT_SET)
+		selected_lcd_type = lcd_enabled;
+	if (lcd_type != NOT_SET)
+		selected_lcd_type = lcd_type;
+
+	lcd.enabled = (selected_lcd_type > 0);
+
+	if (lcd.enabled) {
+		/*
+		 * Init lcd struct with load-time values to preserve exact
+		 * current functionality (at least for now).
+		 */
+		lcd.charset = lcd_charset;
+		lcd.proto = lcd_proto;
+		lcd.pins.e = lcd_e_pin;
+		lcd.pins.rs = lcd_rs_pin;
+		lcd.pins.rw = lcd_rw_pin;
+		lcd.pins.cl = lcd_cl_pin;
+		lcd.pins.da = lcd_da_pin;
+		lcd.pins.bl = lcd_bl_pin;
+	}
+
+	switch (selected_keypad_type) {
+	case KEYPAD_TYPE_OLD:
+		keypad_profile = old_keypad_profile;
+		break;
+	case KEYPAD_TYPE_NEW:
+		keypad_profile = new_keypad_profile;
+		break;
+	case KEYPAD_TYPE_NEXCOM:
+		keypad_profile = nexcom_keypad_profile;
+		break;
+	default:
+		keypad_profile = NULL;
+		break;
+	}
+
+	if (!lcd.enabled && !keypad.enabled) {
+		/* no device enabled, let's exit */
+		pr_err("panel driver disabled.\n");
+		return -ENODEV;
+	}
+
+	err = parport_register_driver(&panel_driver);
+	if (err) {
+		pr_err("could not register with parport. Aborting.\n");
+		return err;
+	}
+
+	if (pprt)
+		pr_info("panel driver registered on parport%d (io=0x%lx).\n",
+			parport, pprt->port->base);
+	else
+		pr_info("panel driver not yet registered\n");
+	return 0;
+}
+
+static void __exit panel_cleanup_module(void)
+{
+	parport_unregister_driver(&panel_driver);
+}
+
+module_init(panel_init_module);
+module_exit(panel_cleanup_module);
+MODULE_AUTHOR("Willy Tarreau");
+MODULE_LICENSE("GPL");
+
+/*
+ * Local variables:
+ *  c-indent-level: 4
+ *  tab-width: 8
+ * End:
+ */