/* $Id$ * $URL$ * * hashes (associative arrays) * * Copyright (C) 2003 Michael Reinelt * Copyright (C) 2004 The LCD4Linux Team * * This file is part of LCD4Linux. * * LCD4Linux 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, or (at your option) * any later version. * * LCD4Linux is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * */ /* * exported functions: * * void hash_create (HASH *Hash); * initializes hash * * int hash_age (HASH *Hash, char *key, char **value); * return time of last hash_put * * void hash_put (HASH *Hash, char *key, char *val); * set an entry in the hash * * void hash_put_delta (HASH *Hash, char *key, char *val); * set a delta entry in the hash * * char *hash_get (HASH *Hash, char *key); * fetch an entry from the hash * * double hash_get_delta (HASH *Hash, char *key, int delay); * fetch a delta antry from the hash * * double hash_get_regex (HASH *Hash, char *key, int delay); * fetch one or more entries from the hash * * void hash_destroy (HASH *Hash); * releases hash * */ #include "config.h" #include #include #include #include #include "debug.h" #include "hash.h" #ifdef WITH_DMALLOC #include #endif /* number of slots for delta processing */ #define DELTA_SLOTS 64 /* string buffer chunk size */ #define CHUNK_SIZE 16 /* initialize a new hash table */ void hash_create(HASH * Hash) { Hash->sorted = 0; Hash->timestamp.tv_sec = 0; Hash->timestamp.tv_usec = 0; Hash->nItems = 0; Hash->Items = NULL; Hash->nColumns = 0; Hash->Columns = NULL; Hash->delimiter = strdup(" \t\n"); } /* bsearch compare function for hash items */ static int hash_lookup_item(const void *a, const void *b) { char *key = (char *) a; HASH_ITEM *item = (HASH_ITEM *) b; return strcasecmp(key, item->key); } /* qsort compare function for hash items */ static int hash_sort_item(const void *a, const void *b) { HASH_ITEM *ha = (HASH_ITEM *) a; HASH_ITEM *hb = (HASH_ITEM *) b; return strcasecmp(ha->key, hb->key); } /* bsearch compare function for hash headers */ static int hash_lookup_column(const void *a, const void *b) { char *key = (char *) a; HASH_COLUMN *column = (HASH_COLUMN *) b; return strcasecmp(key, column->key); } /* qsort compare function for hash headers */ static int hash_sort_column(const void *a, const void *b) { HASH_COLUMN *ha = (HASH_COLUMN *) a; HASH_COLUMN *hb = (HASH_COLUMN *) b; return strcasecmp(ha->key, hb->key); } /* split a value into columns and */ /* return the nth column in a string */ /* WARNING: does return a pointer to a static string!! */ static char *split(const char *val, const int column, const char *delimiter) { static char buffer[256]; int num; size_t len; const char *beg, *end; if (column < 0) return (char *) val; if (val == NULL) return NULL; num = 0; len = 0; beg = val; end = beg; while (beg && *beg) { while (strchr(delimiter, *beg)) beg++; end = strpbrk(beg, delimiter); if (num++ == column) break; beg = end ? end + 1 : NULL; } if (beg != NULL) { len = end ? (size_t) (end - beg) : strlen(beg); if (len >= sizeof(buffer)) len = sizeof(buffer) - 1; strncpy(buffer, beg, len); } buffer[len] = '\0'; return buffer; } /* search an entry in the hash table: */ /* If the table is flagged "sorted", the entry is looked */ /* up using the bsearch function. If the table is */ /* unsorted, it will be searched in a linear way */ static HASH_ITEM *hash_lookup(HASH * Hash, const char *key, const int do_sort) { HASH_ITEM *Item = NULL; /* maybe sort the array */ if (do_sort && !Hash->sorted) { qsort(Hash->Items, Hash->nItems, sizeof(HASH_ITEM), hash_sort_item); Hash->sorted = 1; } /* no key was passed */ if (key == NULL) return NULL; /* lookup using bsearch */ if (Hash->sorted) { Item = bsearch(key, Hash->Items, Hash->nItems, sizeof(HASH_ITEM), hash_lookup_item); } /* linear search */ if (Item == NULL) { int i; for (i = 0; i < Hash->nItems; i++) { if (strcmp(key, Hash->Items[i].key) == 0) { Item = &(Hash->Items[i]); break; } } } return Item; } /* return the age in milliseconds of an entry from the hash table */ /* or from the hash table itself if key is NULL */ /* returns -1 if entry does not exist */ int hash_age(HASH * Hash, const char *key) { HASH_ITEM *Item; struct timeval now, *timestamp; if (key == NULL) { timestamp = &(Hash->timestamp); } else { Item = hash_lookup(Hash, key, 1); if (Item == NULL) return -1; timestamp = &(Item->Slot[Item->index].timestamp); } gettimeofday(&now, NULL); return (now.tv_sec - timestamp->tv_sec) * 1000 + (now.tv_usec - timestamp->tv_usec) / 1000; } /* add an entry to the column header table */ void hash_set_column(HASH * Hash, const int number, const char *column) { if (Hash == NULL) return; Hash->nColumns++; Hash->Columns = realloc(Hash->Columns, Hash->nColumns * sizeof(HASH_COLUMN)); Hash->Columns[Hash->nColumns - 1].key = strdup(column); Hash->Columns[Hash->nColumns - 1].val = number; qsort(Hash->Columns, Hash->nColumns, sizeof(HASH_COLUMN), hash_sort_column); } /* fetch a column number by column header */ static int hash_get_column(HASH * Hash, const char *key) { HASH_COLUMN *Column; if (key == NULL || *key == '\0') return -1; Column = bsearch(key, Hash->Columns, Hash->nColumns, sizeof(HASH_COLUMN), hash_lookup_column); if (Column == NULL) return -1; return Column->val; } /* set column delimiters */ void hash_set_delimiter(HASH * Hash, const char *delimiter) { if (Hash->delimiter != NULL) free(Hash->delimiter); Hash->delimiter = strdup(delimiter); } /* get a string from the hash table */ char *hash_get(HASH * Hash, const char *key, const char *column) { HASH_ITEM *Item; int c; Item = hash_lookup(Hash, key, 1); if (Item == NULL) return NULL; c = hash_get_column(Hash, column); return split(Item->Slot[Item->index].value, c, Hash->delimiter); } /* get a delta value from the delta table */ double hash_get_delta(HASH * Hash, const char *key, const char *column, const int delay) { HASH_ITEM *Item; HASH_SLOT *Slot1, *Slot2; int i, c; double v1, v2; double dv, dt; struct timeval now, end; /* lookup item */ Item = hash_lookup(Hash, key, 1); if (Item == NULL) return 0.0; /* this is the "current" Slot */ Slot1 = &(Item->Slot[Item->index]); /* fetch column number */ c = hash_get_column(Hash, column); /* if delay is zero, return absolute value */ if (delay == 0) return atof(split(Slot1->value, c, Hash->delimiter)); /* prepare timing values */ now = Slot1->timestamp; end.tv_sec = now.tv_sec; end.tv_usec = now.tv_usec - 1000 * delay; while (end.tv_usec < 0) { end.tv_sec--; end.tv_usec += 1000000; } /* search delta slot */ Slot2 = &(Item->Slot[Item->index]); for (i = 1; i < Item->nSlot; i++) { Slot2 = &(Item->Slot[(Item->index + i) % Item->nSlot]); if (Slot2->timestamp.tv_sec == 0) break; if (timercmp(&(Slot2->timestamp), &end, <)) break; } /* empty slot => try the one before */ if (Slot2->timestamp.tv_sec == 0) { i--; Slot2 = &(Item->Slot[(Item->index + i) % Item->nSlot]); } /* not enough slots available... */ if (i == 0) return 0.0; /* delta value, delta time */ v1 = atof(split(Slot1->value, c, Hash->delimiter)); v2 = atof(split(Slot2->value, c, Hash->delimiter)); dv = v1 - v2; dt = (Slot1->timestamp.tv_sec - Slot2->timestamp.tv_sec) + (Slot1->timestamp.tv_usec - Slot2->timestamp.tv_usec) / 1000000.0; if (dt > 0.0 && dv >= 0.0) return dv / dt; return 0.0; } /* get a delta value from the delta table */ /* key may contain regular expressions, and the sum */ /* of all matching entries is returned. */ double hash_get_regex(HASH * Hash, const char *key, const char *column, const int delay) { double sum; regex_t preg; int i, err; err = regcomp(&preg, key, REG_ICASE | REG_NOSUB); if (err != 0) { char buffer[32]; regerror(err, &preg, buffer, sizeof(buffer)); error("error in regular expression: %s", buffer); regfree(&preg); return 0.0; } /* force the table to be sorted by requesting anything */ hash_lookup(Hash, NULL, 1); sum = 0.0; for (i = 0; i < Hash->nItems; i++) { if (regexec(&preg, Hash->Items[i].key, 0, NULL, 0) == 0) { sum += hash_get_delta(Hash, Hash->Items[i].key, column, delay); } } regfree(&preg); return sum; } /* insert a key/val pair into the hash table */ /* If the entry does already exist, it will be overwritten, */ /* and the table stays sorted (if it has been before). */ /* Otherwise, the entry is appended at the end, and */ /* the table will be flagged 'unsorted' afterwards */ static HASH_ITEM *hash_set(HASH * Hash, const char *key, const char *value, const int delta) { HASH_ITEM *Item; HASH_SLOT *Slot; int size; Item = hash_lookup(Hash, key, 0); if (Item == NULL) { /* add entry */ Hash->sorted = 0; Hash->nItems++; Hash->Items = realloc(Hash->Items, Hash->nItems * sizeof(HASH_ITEM)); Item = &(Hash->Items[Hash->nItems - 1]); Item->key = strdup(key); Item->index = 0; Item->nSlot = delta; Item->Slot = malloc(Item->nSlot * sizeof(HASH_SLOT)); memset(Item->Slot, 0, Item->nSlot * sizeof(HASH_SLOT)); } else { /* maybe enlarge delta table */ if (Item->nSlot < delta) { Item->nSlot = delta; Item->Slot = realloc(Item->Slot, Item->nSlot * sizeof(HASH_SLOT)); } } if (Item->nSlot > 1) { /* move the pointer to the next free slot, wrap around if necessary */ if (--Item->index < 0) Item->index = Item->nSlot - 1; } /* create entry */ Slot = &(Item->Slot[Item->index]); size = strlen(value) + 1; /* maybe enlarge value buffer */ if (size > Slot->size) { /* buffer is either empty or too small */ /* allocate memory in multiples of CHUNK_SIZE */ Slot->size = CHUNK_SIZE * (size / CHUNK_SIZE + 1); Slot->value = realloc(Slot->value, Slot->size); } /* set value */ strcpy(Slot->value, value); /* set timestamps */ gettimeofday(&(Hash->timestamp), NULL); Slot->timestamp = Hash->timestamp; return Item; } /* insert a string into the hash table */ /* without delta processing */ void hash_put(HASH * Hash, const char *key, const char *value) { hash_set(Hash, key, value, 1); } /* insert a string into the hash table */ /* with delta processing */ void hash_put_delta(HASH * Hash, const char *key, const char *value) { hash_set(Hash, key, value, DELTA_SLOTS); } void hash_destroy(HASH * Hash) { int i; if (Hash->Items) { /* free all headers */ for (i = 0; i < Hash->nColumns; i++) { if (Hash->Columns[i].key) free(Hash->Columns[i].key); } /* free header table */ free(Hash->Columns); /* free all items */ for (i = 0; i < Hash->nItems; i++) { if (Hash->Items[i].key) free(Hash->Items[i].key); if (Hash->Items[i].Slot) free(Hash->Items[i].Slot); } /* free items table */ free(Hash->Items); } Hash->sorted = 0; Hash->nItems = 0; Hash->Items = NULL; } 6 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 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/* $Id$
 * $URL$
 *
 * new style driver for HD44780-based displays
 *
 * Copyright (C) 2003 Michael Reinelt <michael@reinelt.co.at>
 * Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
 *
 * Support for I2C bus
 * Copyright (C) 2005 Luis Correia <lfcorreia@users.sf.net>
 *
 * Modification for 4-Bit mode
 * Copyright (C) 2003 Martin Hejl (martin@hejl.de)
 *
 * Modification for 2nd controller support
 * Copyright (C) 2003 Jesse Brook Kovach <jkovach@wam.umd.edu>
 *
 * This file is part of LCD4Linux.
 *
 * LCD4Linux 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, or (at your option)
 * any later version.
 *
 * LCD4Linux is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

/* 
 *
 * exported fuctions:
 *
 * struct DRIVER drv_HD44780
 *
 */

#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <termios.h>
#include <fcntl.h>
#include <sys/time.h>
#include <sys/ioctl.h>

#include "debug.h"
#include "cfg.h"
#include "udelay.h"
#include "qprintf.h"
#include "timer.h"
#include "plugin.h"
#include "widget.h"
#include "widget_text.h"
#include "widget_icon.h"
#include "widget_bar.h"
#include "widget_keypad.h"
#include "drv.h"
#include "drv_generic_text.h"
#include "drv_generic_gpio.h"

#ifdef WITH_PARPORT
#include "drv_generic_parport.h"
#include "drv_generic_keypad.h"
#include "widget_keypad.h"
#endif

#ifdef WITH_I2C
#include "drv_generic_i2c.h"
#endif

static char Name[] = "HD44780";

static int Bus;
static int Model;
static int Capabilities;


/* Timings */
#ifdef WITH_PARPORT
static int T_CY, T_PW, T_AS, T_AH;
#endif
static int T_INIT1, T_INIT2, T_EXEC, T_WRCG, T_CLEAR, T_HOME, T_ONOFF;
#ifdef WITH_PARPORT
static int T_POWER, T_GPO_ST, T_GPO_PW;
#endif

static int Bits = 0;
static int numControllers = 0;
static int allControllers = 0;
static int currController = 0;

/* size of every single controller */
static int CROWS[4];
static int CCOLS[4];

static unsigned char SIGNAL_RW;
static unsigned char SIGNAL_RS;
static unsigned char SIGNAL_ENABLE;
static unsigned char SIGNAL_ENABLE2;
static unsigned char SIGNAL_ENABLE3;
static unsigned char SIGNAL_ENABLE4;

static unsigned char SIGNAL_GPO;
static unsigned char SIGNAL_GPI;
#ifdef WITH_PARPORT
static unsigned char SIGNAL_BACKLIGHT;
static unsigned char SIGNAL_POWER;
#endif

/* maximum time to wait for the busy-flag (in usec) */
#define MAX_BUSYFLAG_WAIT 10000

/* maximum busy flag errors before falling back to busy-waiting */
#define MAX_BUSYFLAG_ERRORS 20

/* flag for busy-waiting vs. busy flag checking */
#ifdef WITH_PARPORT
static int UseBusy = 0;
#endif

/* which data bits should have their logic inverted */
static int invert_data_bits = 0;

/* buffer holding the GPIO state */
#ifdef WITH_PARPORT
static unsigned char GPO = 0;
#endif

typedef struct {
    int type;
    char *name;
    int capabilities;
} MODEL;

#define CAP_PARPORT    (1<<0)
#define CAP_I2C        (1<<1)
#define CAP_GPO        (1<<2)
#define CAP_BACKLIGHT  (1<<3)
#define CAP_BRIGHTNESS (1<<4)
#define CAP_BUSY4BIT   (1<<5)
#define CAP_HD66712    (1<<6)
#define CAP_LCM162     (1<<7)
#define CAP_GPI        (1<<8)

#define BUS_PP  CAP_PARPORT
#define BUS_I2C CAP_I2C


static MODEL Models[] = {
    {0x01, "generic", CAP_PARPORT | CAP_I2C | CAP_GPO | CAP_GPI | CAP_BACKLIGHT},
    {0x02, "Noritake", CAP_PARPORT | CAP_I2C | CAP_GPO | CAP_BRIGHTNESS},
    {0x03, "Soekris", CAP_PARPORT | CAP_BUSY4BIT},
    {0x04, "HD66712", CAP_PARPORT | CAP_I2C | CAP_GPO | CAP_BACKLIGHT | CAP_HD66712},
    {0x05, "LCM-162", CAP_PARPORT | CAP_LCM162},
    {0xff, "Unknown", 0}
};


/****************************************/
/***  generic functions               ***/
/****************************************/

static int (*drv_HD_load) (const char *section);
static void (*drv_HD_command) (const unsigned char controller, const unsigned char cmd, const unsigned long delay);
static void (*drv_HD_data) (const unsigned char controller, const char *string, const int len,
			    const unsigned long delay);
static void (*drv_HD_stop) (void);



/****************************************/
/***  parport dependant functions     ***/
/****************************************/

#ifdef WITH_PARPORT

static void drv_HD_PP_busy(const int controller)
{
    static unsigned int errors = 0;

    unsigned char enable;
    unsigned char data = 0xFF;
    unsigned char busymask;
    unsigned char ctrlmask;
    unsigned int counter;

    if (Bits == 8) {
	busymask = 0x80;
    } else {
	/* Since in 4-Bit mode DB0 on the parport is mapped to DB4 on the LCD
	 * (and consequently, DB3 on the partport is mapped to DB7 on the LCD)
	 * we need to listen for DB3 on the parport to go low
	 */
	busymask = 0x08;
    }

    ctrlmask = 0x08;
    while (ctrlmask > 0) {

	if (controller & ctrlmask) {

	    enable = 0;
	    if (ctrlmask & 0x01)
		enable = SIGNAL_ENABLE;
	    else if (ctrlmask & 0x02)
		enable = SIGNAL_ENABLE2;
	    else if (ctrlmask & 0x04)
		enable = SIGNAL_ENABLE3;
	    else if (ctrlmask & 0x08)
		enable = SIGNAL_ENABLE4;

	    /* set data-lines to input */
	    drv_generic_parport_direction(1);

	    if (Bits == 8) {
		/* Set RW, clear RS */
		drv_generic_parport_control(SIGNAL_RW | SIGNAL_RS, SIGNAL_RW);
	    } else {
		drv_generic_parport_data(SIGNAL_RW ^ invert_data_bits);
	    }

	    /* Address set-up time */
	    ndelay(T_AS);

	    /* rise ENABLE */
	    if (Bits == 8) {
		drv_generic_parport_control(enable, enable);
	    } else {
		drv_generic_parport_data((SIGNAL_RW | enable) ^ invert_data_bits);
	    }

	    counter = 0;
	    while (1) {
		/* read the busy flag */
		data = drv_generic_parport_read();
		if ((data & busymask) == 0) {
		    errors = 0;
		    break;
		}

		/* make sure we don't wait forever
		 * - but only check after 5 iterations
		 * that way, we won't slow down normal mode
		 * (where we don't need the timeout anyway) 
		 */
		counter++;

		if (counter >= 5) {
		    struct timeval now, end;

		    if (counter == 5) {
			/* determine the time when the timeout has expired */
			gettimeofday(&end, NULL);
			end.tv_usec += MAX_BUSYFLAG_WAIT;
			while (end.tv_usec > 1000000) {
			    end.tv_usec -= 1000000;
			    end.tv_sec++;
			}
		    }

		    /* get the current time */
		    gettimeofday(&now, NULL);
		    if (now.tv_sec == end.tv_sec ? now.tv_usec >= end.tv_usec : now.tv_sec >= end.tv_sec) {
			error("%s: timeout waiting for busy flag on controller %x (0x%02x)", Name, ctrlmask, data);
			if (++errors >= MAX_BUSYFLAG_ERRORS) {
			    error("%s: too many busy flag failures, turning off busy flag checking.", Name);
			    UseBusy = 0;
			}
			break;
		    }
		}
	    }

	    /* RS=low, RW=low, EN=low */
	    if (Bits == 8) {
		/* Lower EN */
		drv_generic_parport_control(enable, 0);

		/* Address hold time */
		ndelay(T_AH);

		drv_generic_parport_control(SIGNAL_RW | SIGNAL_RS, 0);
	    } else {
		/* Lower EN */
		drv_generic_parport_data(SIGNAL_RW ^ invert_data_bits);
		ndelay(T_AH);
		drv_generic_parport_data(0 ^ invert_data_bits);
	    }

	    /* set data-lines to output */
	    drv_generic_parport_direction(0);
	}
	ctrlmask >>= 1;
    }
}


static void drv_HD_PP_nibble(const unsigned char controller, const unsigned char nibble)
{
    unsigned char enable;

    /* enable signal: 'controller' is a bitmask */
    /* bit n .. send to controller #n */
    /* so we can send a byte to more controllers at the same time! */
    enable = 0;
    if (controller & 0x01)
	enable |= SIGNAL_ENABLE;
    if (controller & 0x02)
	enable |= SIGNAL_ENABLE2;
    if (controller & 0x04)
	enable |= SIGNAL_ENABLE3;
    if (controller & 0x08)
	enable |= SIGNAL_ENABLE4;

    /* clear ENABLE */
    /* put data on DB1..DB4 */
    /* nibble already contains RS bit! */
    drv_generic_parport_data(nibble ^ invert_data_bits);

    /* Address set-up time */
    ndelay(T_AS);

    /* rise ENABLE */
    drv_generic_parport_data((nibble | enable) ^ invert_data_bits);

    /* Enable pulse width */
    ndelay(T_PW);

    /* lower ENABLE */
    drv_generic_parport_data(nibble ^ invert_data_bits);
}


static void drv_HD_PP_byte(const unsigned char controller, const unsigned char data, const unsigned char RS)
{
    /* send high nibble of the data */
    drv_HD_PP_nibble(controller, ((data >> 4) & 0x0f) | RS);

    /* Make sure we honour T_CY */
    ndelay(T_CY - T_AS - T_PW);

    /* send low nibble of the data */
    drv_HD_PP_nibble(controller, (data & 0x0f) | RS);
}


static void drv_HD_PP_command(const unsigned char controller, const unsigned char cmd, const unsigned long delay)
{
    unsigned char enable;

    if (UseBusy)
	drv_HD_PP_busy(controller);

    if (Bits == 8) {

	/* enable signal: 'controller' is a bitmask */
	/* bit n .. send to controller #n */
	/* so we can send a byte to more controllers at the same time! */
	enable = 0;
	if (controller & 0x01)
	    enable |= SIGNAL_ENABLE;
	if (controller & 0x02)
	    enable |= SIGNAL_ENABLE2;
	if (controller & 0x04)
	    enable |= SIGNAL_ENABLE3;
	if (controller & 0x08)
	    enable |= SIGNAL_ENABLE4;

	/* put data on DB1..DB8 */
	drv_generic_parport_data(cmd ^ invert_data_bits);

	/* clear RW and RS */
	drv_generic_parport_control(SIGNAL_RW | SIGNAL_RS, 0);

	/* Address set-up time */
	ndelay(T_AS);

	/* send command */
	drv_generic_parport_toggle(enable, 1, T_PW);

    } else {

	drv_HD_PP_byte(controller, cmd, 0);

    }

    /* wait for command completion */
    if (!UseBusy)
	udelay(delay);

}


static void drv_HD_PP_data(const unsigned char controller, const char *string, const int len, const unsigned long delay)
{
    int l = len;
    unsigned char enable;

    /* sanity check */
    if (len <= 0)
	return;

    if (Bits == 8) {

	/* enable signal: 'controller' is a bitmask */
	/* bit n .. send to controller #n */
	/* so we can send a byte to more controllers at the same time! */
	enable = 0;
	if (controller & 0x01)
	    enable |= SIGNAL_ENABLE;
	if (controller & 0x02)
	    enable |= SIGNAL_ENABLE2;
	if (controller & 0x04)
	    enable |= SIGNAL_ENABLE3;
	if (controller & 0x08)
	    enable |= SIGNAL_ENABLE4;

	if (!UseBusy) {
	    /* clear RW, set RS */
	    drv_generic_parport_control(SIGNAL_RW | SIGNAL_RS, SIGNAL_RS);
	    /* Address set-up time */
	    ndelay(T_AS);
	}

	while (l--) {

	    if (UseBusy) {
		drv_HD_PP_busy(controller);
		/* clear RW, set RS */
		drv_generic_parport_control(SIGNAL_RW | SIGNAL_RS, SIGNAL_RS);
		/* Address set-up time */
		ndelay(T_AS);
	    }

	    /* put data on DB1..DB8 */
	    drv_generic_parport_data((*(string++)) ^ invert_data_bits);

	    /* send command */
	    drv_generic_parport_toggle(enable, 1, T_PW);

	    /* wait for command completion */
	    if (!UseBusy)
		udelay(delay);
	}

    } else {			/* 4 bit mode */

	while (l--) {
	    if (UseBusy)
		drv_HD_PP_busy(controller);

	    /* send data with RS enabled */
	    drv_HD_PP_byte(controller, *(string++), SIGNAL_RS);

	    /* wait for command completion */
	    if (!UseBusy)
		udelay(delay);
	}
    }
}


static int drv_HD_PP_load(const char *section)
{
    if (cfg_number(section, "Bits", 8, 4, 8, &Bits) < 0)
	return -1;

    if (Bits != 4 && Bits != 8) {
	error("%s: bad %s.Bits '%d' from %s, should be '4' or '8'", Name, section, Bits, cfg_source());
	return -1;
    }

    /* LCM-162 only supports 8-bit-mode */
    if (Capabilities & CAP_LCM162 && Bits != 8) {
	error("%s: Model '%s' does not support %d bit mode!", Name, Models[Model].name, Bits);
	Bits = 8;
    }
    info("%s: using %d bit mode", Name, Bits);

    if (drv_generic_parport_open(section, Name) != 0) {
	error("%s: could not initialize parallel port!", Name);
	return -1;
    }

    /* Soft-Wiring */
    if (Capabilities & CAP_LCM162) {
	/* the LCM-162 is hardwired */
	if ((SIGNAL_RS = drv_generic_parport_hardwire_ctrl("RS", "SLCTIN")) == 0xff)
	    return -1;
	if ((SIGNAL_RW = drv_generic_parport_hardwire_ctrl("RW", "INIT")) == 0xff)
	    return -1;
	if ((SIGNAL_ENABLE = drv_generic_parport_hardwire_ctrl("ENABLE", "AUTOFD")) == 0xff)
	    return -1;
	if ((SIGNAL_ENABLE2 = drv_generic_parport_hardwire_ctrl("ENABLE2", "GND")) == 0xff)
	    return -1;
	if ((SIGNAL_ENABLE3 = drv_generic_parport_hardwire_ctrl("ENABLE3", "GND")) == 0xff)
	    return -1;
	if ((SIGNAL_ENABLE4 = drv_generic_parport_hardwire_ctrl("ENABLE4", "GND")) == 0xff)
	    return -1;
	if ((SIGNAL_BACKLIGHT = drv_generic_parport_hardwire_ctrl("BACKLIGHT", "GND")) == 0xff)
	    return -1;
	if ((SIGNAL_GPO = drv_generic_parport_hardwire_ctrl("GPO", "GND")) == 0xff)
	    return -1;
	if ((SIGNAL_POWER = drv_generic_parport_hardwire_ctrl("POWER", "GND")) == 0xff)
	    return -1;
    } else {
	if (Bits == 8) {
	    if ((SIGNAL_RS = drv_generic_parport_wire_ctrl("RS", "AUTOFD")) == 0xff)
		return -1;
	    if ((SIGNAL_RW = drv_generic_parport_wire_ctrl("RW", "GND")) == 0xff)
		return -1;
	    if ((SIGNAL_ENABLE = drv_generic_parport_wire_ctrl("ENABLE", "STROBE")) == 0xff)
		return -1;
	    if ((SIGNAL_ENABLE2 = drv_generic_parport_wire_ctrl("ENABLE2", "GND")) == 0xff)
		return -1;
	    if ((SIGNAL_ENABLE3 = drv_generic_parport_wire_ctrl("ENABLE3", "GND")) == 0xff)
		return -1;
	    if ((SIGNAL_ENABLE4 = drv_generic_parport_wire_ctrl("ENABLE4", "GND")) == 0xff)
		return -1;
	} else {
	    if ((SIGNAL_RS = drv_generic_parport_wire_data("RS", "DB4")) == 0xff)
		return -1;
	    if ((SIGNAL_RW = drv_generic_parport_wire_data("RW", "DB5")) == 0xff)
		return -1;
	    if ((SIGNAL_ENABLE = drv_generic_parport_wire_data("ENABLE", "DB6")) == 0xff)
		return -1;
	    if ((SIGNAL_ENABLE2 = drv_generic_parport_wire_data("ENABLE2", "GND")) == 0xff)
		return -1;
	    if ((SIGNAL_ENABLE3 = drv_generic_parport_wire_data("ENABLE3", "GND")) == 0xff)
		return -1;
	    if ((SIGNAL_ENABLE4 = drv_generic_parport_wire_data("ENABLE4", "GND")) == 0xff)
		return -1;
	}
	/* backlight GPO and power are always control signals */
	if ((SIGNAL_BACKLIGHT = drv_generic_parport_wire_ctrl("BACKLIGHT", "GND")) == 0xff)
	    return -1;
	if ((SIGNAL_GPO = drv_generic_parport_wire_ctrl("GPO", "GND")) == 0xff)
	    return -1;
	if ((SIGNAL_GPI = drv_generic_parport_wire_ctrl("GPI", "GND")) == 0xff)
	    return -1;
	if ((SIGNAL_POWER = drv_generic_parport_wire_ctrl("POWER", "GND")) == 0xff)
	    return -1;
    }

    /* clear capabilities if corresponding signal is GND */
    if (SIGNAL_BACKLIGHT == 0) {
	Capabilities &= ~CAP_BACKLIGHT;
    }
    if (SIGNAL_GPO == 0) {
	Capabilities &= ~CAP_GPO;
    }
    if (SIGNAL_GPI == 0) {
	Capabilities &= ~CAP_GPI;
    }

    /* Timings */

    /* low level communication timings [nanoseconds]
     * as these values differ from spec to spec,
     * we use the worst-case default values, but allow
     * modification from the config file.
     */
    T_CY = timing(Name, section, "CY", 1000, "ns");	/* Enable cycle time */
    T_PW = timing(Name, section, "PW", 450, "ns");	/* Enable pulse width */
    T_AS = timing(Name, section, "AS", 140, "ns");	/* Address setup time */
    T_AH = timing(Name, section, "AH", 20, "ns");	/* Address hold time */

    /* GPO timing */
    if (SIGNAL_GPO != 0) {
	T_GPO_ST = timing(Name, section, "GPO_ST", 20, "ns");	/* 74HCT573 set-up time */
	T_GPO_PW = timing(Name, section, "GPO_PW", 230, "ns");	/* 74HCT573 enable pulse width */
    } else {
	T_GPO_ST = 0;
	T_GPO_PW = 0;
    }

    /* HD44780 execution timings [microseconds]
     * as these values differ from spec to spec,
     * we use the worst-case default values, but allow
     * modification from the config file.
     */
    T_INIT1 = timing(Name, section, "INIT1", 4100, "us");	/* first init sequence: 4.1 msec */
    T_INIT2 = timing(Name, section, "INIT2", 100, "us");	/* second init sequence: 100 usec */
    T_EXEC = timing(Name, section, "EXEC", 80, "us");	/* normal execution time */
    T_WRCG = timing(Name, section, "WRCG", 120, "us");	/* CG RAM Write */
    T_CLEAR = timing(Name, section, "CLEAR", 2250, "us");	/* Clear Display */
    T_HOME = timing(Name, section, "HOME", 2250, "us");	/* Return Cursor Home */
    T_ONOFF = timing(Name, section, "ONOFF", 2250, "us");	/* Display On/Off Control */

    /* Power-on delay */
    if (SIGNAL_POWER != 0) {
	T_POWER = timing(Name, section, "POWER", 500, "ms");
    } else {
	T_POWER = 0;
    }

    /* clear all signals */
    if (Bits == 8) {
	drv_generic_parport_control(SIGNAL_RS | SIGNAL_RW |
				    SIGNAL_ENABLE | SIGNAL_ENABLE2 | SIGNAL_ENABLE3 | SIGNAL_ENABLE4 |
				    SIGNAL_BACKLIGHT | SIGNAL_GPO | SIGNAL_POWER, 0);
    } else {
	drv_generic_parport_control(SIGNAL_BACKLIGHT | SIGNAL_GPO | SIGNAL_POWER, 0);
	drv_generic_parport_data(0 ^ invert_data_bits);
    }

    /* set direction: write */
    drv_generic_parport_direction(0);

    /* raise power pin */
    if (SIGNAL_POWER != 0) {
	drv_generic_parport_control(SIGNAL_POWER, SIGNAL_POWER);
	udelay(1000 * T_POWER);
    }

    /* initialize *all* controllers */
    if (Bits == 8) {
	drv_HD_PP_command(allControllers, 0x30, T_INIT1);	/* 8 Bit mode, wait 4.1 ms */
	drv_HD_PP_command(allControllers, 0x30, T_INIT2);	/* 8 Bit mode, wait 100 us */
	drv_HD_PP_command(allControllers, 0x38, T_EXEC);	/* 8 Bit mode, 1/16 duty cycle, 5x8 font */
    } else {
	drv_HD_PP_nibble(allControllers, 0x03);
	udelay(T_INIT1);	/* 4 Bit mode, wait 4.1 ms */
	drv_HD_PP_nibble(allControllers, 0x03);
	udelay(T_INIT2);	/* 4 Bit mode, wait 100 us */
	drv_HD_PP_nibble(allControllers, 0x03);
	udelay(T_INIT1);	/* 4 Bit mode, wait 4.1 ms */
	drv_HD_PP_nibble(allControllers, 0x02);
	udelay(T_INIT2);	/* 4 Bit mode, wait 100 us */
	drv_HD_PP_command(allControllers, 0x28, T_EXEC);	/* 4 Bit mode, 1/16 duty cycle, 5x8 font */
    }

    /* maybe use busy-flag from now on  */
    /* (we can't use the busy flag during the init sequence) */
    cfg_number(section, "UseBusy", 0, 0, 1, &UseBusy);

    /* make sure we don't use the busy flag with RW wired to GND */
    if (UseBusy && !SIGNAL_RW) {
	error("%s: busy-flag checking is impossible with RW wired to GND!", Name);
	UseBusy = 0;
    }

    /* make sure the display supports busy-flag checking in 4-Bit-Mode */
    /* at the moment this is inly possible with Martin Hejl's gpio driver, */
    /* which allows to use 4 bits as input and 4 bits as output */
    if (UseBusy && Bits == 4 && !(Capabilities & CAP_BUSY4BIT)) {
	error("%s: Model '%s' does not support busy-flag checking in 4 bit mode", Name, Models[Model].name);
	UseBusy = 0;
    }

    info("%s: %susing busy-flag checking", Name, UseBusy ? "" : "not ");

    /* The LCM-162 should really use BusyFlag checking */
    if (!UseBusy && (Capabilities & CAP_LCM162)) {
	error("%s: Model '%s' should definitely use busy-flag checking!", Name, Models[Model].name);
    }

    return 0;
}


static void drv_HD_PP_stop(void)
{
    /* clear all signals */
    if (Bits == 8) {
	drv_generic_parport_control(SIGNAL_RS |
				    SIGNAL_RW | SIGNAL_ENABLE | SIGNAL_ENABLE2 | SIGNAL_ENABLE3 | SIGNAL_ENABLE4 |
				    SIGNAL_BACKLIGHT | SIGNAL_GPO, 0);
    } else {
	drv_generic_parport_data(0 ^ invert_data_bits);
	drv_generic_parport_control(SIGNAL_BACKLIGHT | SIGNAL_GPO | SIGNAL_POWER, 0);
    }

    drv_generic_parport_close();

}

#endif


#ifdef WITH_I2C

/****************************************/
/***  i2c dependant functions         ***/
/****************************************/

    /*
       DISCLAIMER!!!!

       The following code is WORK IN PROGRESS, since it basicly 'works for us...'

       (C) 2005 Paul Kamphuis & Luis Correia

       We have removed all of the delays from this code, as the I2C bus is slow enough...
       (maximum possible speed is 100KHz only)

     */

static void drv_HD_I2C_nibble(unsigned char controller, unsigned char nibble)
{
    unsigned char enable;
    unsigned char command;	/* this is actually the first data byte on the PCF8574 */
    unsigned char data_block[2];
    /* enable signal: 'controller' is a bitmask */
    /* bit n .. send to controller #n */
    /* so we can send a byte to more controllers at the same time! */
    enable = 0;
    if (controller & 0x01)
	enable |= SIGNAL_ENABLE;
    if (controller & 0x02)
	enable |= SIGNAL_ENABLE2;
    if (controller & 0x04)
	enable |= SIGNAL_ENABLE3;
    if (controller & 0x08)
	enable |= SIGNAL_ENABLE4;

    /*
       The new method Paul Kamphuis has concocted places the 3 needed writes to the I2C device
       as a single operation, using the 'i2c_smbus_write_block_data' function.
       These actual writes are performed by putting the nibble along with the 'EN' signal.

       command = first byte to be written, which contains the nibble (DB0..DB3)
       data [0]   = second byte to be written, which contains the nibble plus the EN signal
       data [1]   = third byte to be written, which contains the nibble (DB0..DB3)

       Then we write the block as a whole.

       The main advantage we see is that we do 2 less IOCTL's from our driver.
     */

    command = nibble;
    data_block[0] = nibble | enable;
    data_block[1] = nibble;

    drv_generic_i2c_command(command, data_block, 2);
}


static void drv_HD_I2C_byte(const unsigned char controller, const unsigned char data)
{
    /* send data with RS enabled */
    drv_HD_I2C_nibble(controller, ((data >> 4) & 0x0f) | SIGNAL_RS);
    drv_HD_I2C_nibble(controller, (data & 0x0f) | SIGNAL_RS);
}


static void drv_HD_I2C_command(const unsigned char controller, const unsigned char cmd, __attribute__ ((unused))
			       const unsigned long delay)
{
    /* send data with RS disabled */
    drv_HD_I2C_nibble(controller, ((cmd >> 4) & 0x0f));
    drv_HD_I2C_nibble(controller, ((cmd) & 0x0f));
}

static void drv_HD_I2C_data(const unsigned char controller, const char *string, const int len, __attribute__ ((unused))
			    const unsigned long delay)
{
    int l = len;

    /* sanity check */
    if (len <= 0)
	return;

    while (l--) {
	drv_HD_I2C_byte(controller, *(string++));
    }
}


static int drv_HD_I2C_load(const char *section)
{
    if (cfg_number(section, "Bits", 8, 4, 8, &Bits) < 0)
	return -1;
    if (Bits != 4) {
	error("%s: bad %s.Bits '%d' from %s, should be '4'", Name, section, Bits, cfg_source());
	return -1;
    }

    info("%s: using %d bit mode", Name, Bits);

    if (drv_generic_i2c_open(section, Name) != 0) {
	error("%s: could not initialize i2c attached device!", Name);
	return -1;
    }

    if ((SIGNAL_RS = drv_generic_i2c_wire("RS", "DB4")) == 0xff)
	return -1;
    if ((SIGNAL_RW = drv_generic_i2c_wire("RW", "DB5")) == 0xff)
	return -1;
    if ((SIGNAL_ENABLE = drv_generic_i2c_wire("ENABLE", "DB6")) == 0xff)
	return -1;
    if ((SIGNAL_ENABLE2 = drv_generic_i2c_wire("ENABLE2", "GND")) == 0xff)
	return -1;
    if ((SIGNAL_GPO = drv_generic_i2c_wire("GPO", "GND")) == 0xff)
	return -1;

    /* initialize display */
    drv_HD_I2C_nibble(allControllers, 0x03);
    udelay(T_INIT1);		/* 4 Bit mode, wait 4.1 ms */
    drv_HD_I2C_nibble(allControllers, 0x03);
    udelay(T_INIT2);		/* 4 Bit mode, wait 100 us */
    drv_HD_I2C_nibble(allControllers, 0x03);
    udelay(T_INIT1);		/* 4 Bit mode, wait 4.1 ms */
    drv_HD_I2C_nibble(allControllers, 0x02);
    udelay(T_INIT2);		/* 4 Bit mode, wait 100 us */
    drv_HD_I2C_command(allControllers, 0x28, T_EXEC);	/* 4 Bit mode, 1/16 duty cycle, 5x8 font */

    info("%s: I2C initialization done", Name);

    return 0;
}


static void drv_HD_I2C_stop(void)
{
    /* clear all signals */
    drv_generic_i2c_data(0);

    /* close port */
    drv_generic_i2c_close();
}

/* END OF DISCLAIMER */

#endif				/* WITH_I2C */


/****************************************/
/***  display dependant functions     ***/
/****************************************/

static void drv_HD_clear(void)
{
    drv_HD_command(allControllers, 0x01, T_CLEAR);	/* clear *all* displays */
}


static int drv_HD_goto(int row, int col)
{
    int pos, controller;

    /* handle multiple controllers */
    for (pos = 0, controller = 0; controller < numControllers; controller++) {
	pos += CROWS[controller];
	if (row < pos) {
	    currController = (1 << controller);
	    break;
	}
	row -= CROWS[controller];
    }

    /* column outside of current display's width */
    if (col >= CCOLS[controller])
	return -1;

    if (0) {
	debug("goto: [%d,%d] mask=%d, controller=%d, size:%dx%d", row, col, currController, controller,
	      CROWS[controller], CCOLS[controller]);
    }

    /* 16x1 Displays are organized as 8x2 :-( */
    if (CCOLS[controller] == 16 && CROWS[controller] == 1 && col > 7) {
	row++;
	col -= 8;
    }

    if (Capabilities & CAP_HD66712) {
	/* the HD66712 doesn't have a braindamadged RAM layout */
	pos = row * 32 + col;
    } else {
	/* 16x4 Controllers use a slightly different layout */
	if (CCOLS[controller] == 16 && CROWS[controller] == 4) {
	    pos = (row % 2) * 64 + (row / 2) * 16 + col;
	} else {
	    pos = (row % 2) * 64 + (row / 2) * 20 + col;
	}
    }
    drv_HD_command(currController, (0x80 | pos), T_EXEC);

    /* return columns left on current display */
    return CCOLS[controller] - col;

}


static void drv_HD_write(const int row, const int col, const char *data, const int len)
{
    int space = drv_HD_goto(row, col);
    if (space > 0) {
	drv_HD_data(currController, data, len > space ? space : len, T_EXEC);
    }
}


static void drv_HD_defchar(const int ascii, const unsigned char *matrix)
{
    int i;
    char buffer[8];

    for (i = 0; i < 8; i++) {
	buffer[i] = matrix[i] & 0x1f;
    }

    /* define chars on *all* controllers! */
    drv_HD_command(allControllers, 0x40 | 8 * ascii, T_EXEC);
    drv_HD_data(allControllers, buffer, 8, T_WRCG);
}


#ifdef WITH_PARPORT

static int drv_HD_backlight(int backlight)
{
    if (!(Capabilities & CAP_BACKLIGHT))
	return -1;

    if (backlight < 0)
	backlight = 0;
    if (backlight > 1)
	backlight = 1;

    drv_generic_parport_control(SIGNAL_BACKLIGHT, backlight ? SIGNAL_BACKLIGHT : 0);

    return backlight;
}

#endif


static int drv_HD_brightness(int brightness)
{
    char cmd;

    if (!(Capabilities & CAP_BRIGHTNESS))
	return -1;

    if (brightness < 0)
	brightness = 0;
    if (brightness > 3)
	brightness = 3;

    cmd = '0' + brightness;

    drv_HD_command(allControllers, 0x38, T_EXEC);	/* enable function */
    drv_HD_data(allControllers, &cmd, 1, T_WRCG);	/* set brightness */

    return brightness;
}


#ifdef WITH_PARPORT

static int drv_HD_GPO(const int num, const int val)
{
    int v;

    if (val > 0) {
	/* set bit */
	v = 1;
	GPO |= 1 << num;
    } else {
	/* clear bit */
	v = 0;
	GPO &= ~(1 << num);
    }

    /* put data on DB1..DB8 */
    drv_generic_parport_data(GPO ^ invert_data_bits);

    /* 74HCT573 set-up time */
    ndelay(T_GPO_ST);

    /* send data */
    /* 74HCT573 enable pulse width */
    drv_generic_parport_toggle(SIGNAL_GPO, 1, T_GPO_PW);

    return v;
}

static int drv_HD_GPI(const int num)
{
    int v;

    /* switch to read mode */
    drv_generic_parport_direction(1);
    drv_generic_parport_control(SIGNAL_GPI, SIGNAL_GPI);

    /* 74HCT573 set-up time + enable pulse width */
    ndelay(T_GPO_ST + T_GPO_PW);

    /* read data from DB1..DB8 */
    v = drv_generic_parport_read() ^ invert_data_bits;

    /* switch back to write mode */
    drv_generic_parport_control(SIGNAL_GPI, 0);
    drv_generic_parport_direction(0);

    return (v >> num) & 1;
}

#endif


#ifdef WITH_PARPORT


static int drv_HD_LCM162_keypad_handler(const int num)
{
    return num;
}

static void drv_HD_LCM162_timer(void __attribute__ ((unused)) * notused)
{
    static unsigned char data = 0x00;

    /* Bit 3+5 : key number */
    /* Bit 6   : key press/release */
    unsigned char mask3 = 1 << 3;
    unsigned char mask5 = 1 << 5;
    unsigned char mask6 = 1 << 6;
    unsigned char mask = mask3 | mask5 | mask6;

    int keynum;
    int updown;

    unsigned char temp;

    temp = drv_generic_parport_status() & mask;

    if (data != temp) {
	data = temp;

	int KEYPAD_VAL = 0;
	keynum = (data & mask3 ? 1 : 0) + (data & mask5 ? 2 : 0);
	switch (keynum) {
	default:
	case 0:
	    KEYPAD_VAL = WIDGET_KEY_CANCEL;
	    break;
	case 1:
	    KEYPAD_VAL = WIDGET_KEY_UP;
	    break;
	case 2:
	    KEYPAD_VAL = WIDGET_KEY_CONFIRM;
	    break;
	case 3:
	    KEYPAD_VAL = WIDGET_KEY_DOWN;
	    break;
	}

	updown = (data & mask6 ? 1 : 0);
	KEYPAD_VAL += updown ? WIDGET_KEY_PRESSED : WIDGET_KEY_RELEASED;

	drv_generic_keypad_press(KEYPAD_VAL);

	debug("key %d press %d", keynum, updown);
    }
}

#endif


static int drv_HD_start(const char *section, const int quiet)
{
    char *model, *size, *bus;
    int rows = -1, cols = -1, gpos = -1, gpis = -1, i;
    int size_defined = 0;
    int size_missing = 0;

    model = cfg_get(section, "Model", "generic");
    if (model != NULL && *model != '\0') {
	int i;
	for (i = 0; Models[i].type != 0xff; i++) {
	    if (strcasecmp(Models[i].name, model) == 0)
		break;
	}
	if (Models[i].type == 0xff) {
	    error("%s: %s.Model '%s' is unknown from %s", Name, section, model, cfg_source());
	    return -1;
	}
	Model = i;
	Capabilities = Models[Model].capabilities;
	info("%s: using model '%s'", Name, Models[Model].name);
    } else {
	error("%s: empty '%s.Model' entry from %s", Name, section, cfg_source());
	free(model);
	return -1;
    }
    free(model);

    bus = cfg_get(section, "Bus", "parport");
    if (bus == NULL && *bus == '\0') {
	error("%s: empty '%s.Bus' entry from %s", Name, section, cfg_source());
	free(bus);
	return -1;
    }

    if (strcasecmp(bus, "parport") == 0) {

#ifdef WITH_PARPORT
	info("%s: using parallel port", Name);
	Bus = BUS_PP;
	drv_HD_load = drv_HD_PP_load;
	drv_HD_command = drv_HD_PP_command;
	drv_HD_data = drv_HD_PP_data;
	drv_HD_stop = drv_HD_PP_stop;
#else
	error("%s: %s.Bus '%s' from %s not available:", Name, section, bus, cfg_source());
	error("%s: lcd4linux was compiled without parport support!", Name);
	free(bus);
	return -1;
#endif

    } else if (strcasecmp(bus, "i2c") == 0) {

#ifdef WITH_I2C
	info("%s: using I2C bus", Name);
	Bus = BUS_I2C;
	drv_HD_load = drv_HD_I2C_load;
	drv_HD_command = drv_HD_I2C_command;
	drv_HD_data = drv_HD_I2C_data;
	drv_HD_stop = drv_HD_I2C_stop;
#else
	error("%s: %s.Bus '%s' from %s not available:", Name, section, bus, cfg_source());
	error("%s: lcd4linux was compiled without i2c support!", Name);
	free(bus);
	return -1;
#endif

    } else {
	error("%s: bad %s.Bus '%s' from %s, should be 'parport' or 'i2c'", Name, section, bus, cfg_source());
	free(bus);
	return -1;
    }

    /* sanity check: Model can use bus */
    if (!(Capabilities & Bus)) {
	error("%s: Model '%s' cannot be used on the %s bus!", Name, Models[Model].name, bus);
	free(bus);
	return -1;
    }
    free(bus);

    if (cfg_number(section, "Controllers", 1, 1, 4, (int *) &numControllers) < 0)
	return -1;
    info("%s: using %d Controller(s)", Name, numControllers);

    /* current Controller */
    currController = 1;

    /* Bitmask for *all* Controllers */
    allControllers = (1 << numControllers) - 1;


    DCOLS = 0;
    DROWS = 0;

    for (i = 0; i < numControllers; i++) {
	char key[6];
	qprintf(key, sizeof(key), "Size%d", i + 1);
	size = cfg_get(section, key, NULL);
	if (size == NULL || *size == '\0') {
	    size_missing++;
	    free(size);
	    continue;
	}
	if (sscanf(size, "%dx%d", &cols, &rows) != 2 || rows < 1 || cols < 1) {
	    error("%s: bad %s.%s '%s' from %s", Name, section, key, size, cfg_source());
	    free(size);
	    return -1;
	}
	free(size);
	CCOLS[i] = cols;
	CROWS[i] = rows;
	size_defined++;
	info("%s: Controller %d: %dx%d", Name, i + 1, cols, rows);
	/* grow the size */
	if (cols > DCOLS)
	    DCOLS = cols;
	DROWS += rows;
    }
    if (size_defined && size_missing) {
	error("%s: bad %s.Size* definition in %s:", Name, section, cfg_source());
	error("%s: either you specify the size for *all* controllers or for none.", Name);
	return -1;
    }

    size = cfg_get(section, "Size", NULL);
    if (size != NULL && *size != '\0') {
	if (sscanf(size, "%dx%d", &cols, &rows) != 2 || rows < 1 || cols < 1) {
	    error("%s: bad %s.Size '%s' from %s", Name, section, size, cfg_source());
	    free(size);
	    return -1;
	}
	if (DCOLS == 0 && DROWS == 0) {
	    for (i = 0; i < numControllers; i++) {
		CCOLS[i] = cols;
		CROWS[i] = rows / numControllers;
		DCOLS = CCOLS[i];
		DROWS += CROWS[i];
	    }
	}
	if (rows != DROWS || cols != DCOLS) {
	    error("%s: bad %s.Size definition in %s:", Name, section, cfg_source());
	    error("%s: Size %dx%d should be %dx%d", Name, cols, rows, DCOLS, DROWS);
	    return -1;
	}
    }
    free(size);


    if (cfg_number(section, "GPOs", 0, 0, 8, &gpos) < 0)
	return -1;
    if (gpos > 0 && !(Capabilities & CAP_GPO)) {
	error("%s: Model '%s' does not support GPO's!", Name, Models[Model].name);
	gpos = 0;
    }
    GPOS = gpos;
    if (GPOS > 0) {
	info("%s: using %d GPO's", Name, GPOS);
    }

    if (cfg_number(section, "GPIs", 0, 0, 8, &gpis) < 0)
	return -1;
    if (gpis > 0 && !(Capabilities & CAP_GPI)) {
	error("%s: Model '%s' does not support GPI's!", Name, Models[Model].name);
	gpis = 0;
    }
    GPIS = gpis;
    if (GPIS > 0) {
	info("%s: using %d GPI's", Name, GPIS);
    }

    if (cfg_number(section, "InvertDataBits", 0, 0, 256, &invert_data_bits) < 0)
	return -1;
    if (invert_data_bits) {
	info("%s: inverting data bits (mask %02X)", Name, invert_data_bits);
    }

    if (drv_HD_load(section) < 0) {
	error("%s: start display failed!", Name);
	return -1;
    }

    drv_HD_command(allControllers, 0x08, T_EXEC);	/* Controller off, cursor off, blink off */
    drv_HD_command(allControllers, 0x0c, T_ONOFF);	/* Display on, cursor off, blink off, wait 1.64 ms */
    drv_HD_command(allControllers, 0x06, T_EXEC);	/* curser moves to right, no shift */

    if ((Capabilities & CAP_HD66712) && DROWS > 2) {
	drv_HD_command(allControllers, Bits == 8 ? 0x3c : 0x2c, T_EXEC);	/* set extended register enable bit */
	drv_HD_command(allControllers, 0x09, T_EXEC);	/* set 4-line mode */
	drv_HD_command(allControllers, Bits == 8 ? 0x38 : 0x28, T_EXEC);	/* clear extended register enable bit */
    }

    drv_HD_clear();		/* clear *all* displays */
    drv_HD_command(allControllers, 0x03, T_HOME);	/* return home */

    /* maybe set backlight */
#ifdef WITH_PARPORT
    if (Capabilities & CAP_BACKLIGHT) {
	int backlight;
	if (cfg_number(section, "Backlight", 0, 0, 1, &backlight) > 0) {
	    info("%s: backlight %s", Name, backlight ? "enabled" : "disabled");
	    drv_HD_backlight(backlight);
	}
    }
#endif

    /* maybe set brightness */
    if (Capabilities & CAP_BRIGHTNESS) {
	int brightness;
	if (cfg_number(section, "Brightness", 0, 0, 3, &brightness) > 0) {
	    info("%s: brightness level %d", Name, brightness);
	    drv_HD_brightness(brightness);
	}
    }

    /* install keypad polling timer for LCM-162 */
#ifdef WITH_PARPORT
    if (Capabilities & CAP_LCM162) {
	timer_add(drv_HD_LCM162_timer, NULL, 10, 0);
	drv_generic_keypad_real_press = drv_HD_LCM162_keypad_handler;
    }
#endif

    if (!quiet) {
	char buffer[40];
	qprintf(buffer, sizeof(buffer), "%s %dx%d", Name, DCOLS, DROWS);
	if (drv_generic_text_greet(buffer, NULL)) {
	    sleep(3);
	    drv_HD_clear();
	}
    }

    return 0;
}


/****************************************/
/***            plugins               ***/
/****************************************/


#ifdef WITH_PARPORT
static void plugin_backlight(RESULT * result, RESULT * arg1)
{
    double backlight;

    backlight = drv_HD_backlight(R2N(arg1));
    SetResult(&result, R_NUMBER, &backlight);
}
#endif

static void plugin_brightness(RESULT * result, RESULT * arg1)
{
    double brightness;

    brightness = drv_HD_brightness(R2N(arg1));
    SetResult(&result, R_NUMBER, &brightness);
}


/****************************************/
/***        widget callbacks          ***/
/****************************************/


/* using drv_generic_text_draw(W) */
/* using drv_generic_text_icon_draw(W) */
/* using drv_generic_text_bar_draw(W) */
/* using drv_generic_gpio_draw(W) */


/****************************************/
/***        exported functions        ***/
/****************************************/


/* list models */
int drv_HD_list(void)
{
    int i;

    for (i = 0; Models[i].type != 0xff; i++) {
	printf("%s ", Models[i].name);
    }
    return 0;
}


/* initialize driver & display */
int drv_HD_init(const char *section, const int quiet)
{
    WIDGET_CLASS wc;
    int asc255bug;
    int ret;

    info("%s: %s", Name, "$Rev$");

    /* display preferences */
    XRES = 5;			/* pixel width of one char  */
    YRES = 8;			/* pixel height of one char  */
    CHARS = 8;			/* number of user-defineable characters */
    CHAR0 = 0;			/* ASCII of first user-defineable char */
    GOTO_COST = 1;		/* number of bytes a goto command requires */

    /* real worker functions */
    drv_generic_text_real_write = drv_HD_write;
    drv_generic_text_real_defchar = drv_HD_defchar;
#ifdef WITH_PARPORT
    drv_generic_gpio_real_set = drv_HD_GPO;
    drv_generic_gpio_real_get = drv_HD_GPI;
#endif

    /* start display */
    if ((ret = drv_HD_start(section, quiet)) != 0)
	return ret;

    /* initialize generic text driver */
    if ((ret = drv_generic_text_init(section, Name)) != 0)
	return ret;

    /* initialize generic icon driver */
    if ((ret = drv_generic_text_icon_init()) != 0)
	return ret;

    /* initialize generic bar driver */
    if ((ret = drv_generic_text_bar_init(0)) != 0)
	return ret;

    /* add fixed chars to the bar driver */
    /* most displays have a full block on ascii 255, but some have kind of  */
    /* an 'inverted P'. If you specify 'asc255bug 1 in the config, this */
    /* char will not be used, but rendered by the bar driver */
    cfg_number(section, "asc255bug", 0, 0, 1, &asc255bug);
    drv_generic_text_bar_add_segment(0, 0, 255, 32);	/* ASCII  32 = blank */
    if (!asc255bug)
	drv_generic_text_bar_add_segment(255, 255, 255, 255);	/* ASCII 255 = block */

    /* initialize generic GPIO driver */
    if ((ret = drv_generic_gpio_init(section, Name)) != 0)
	return ret;

    if ((ret = drv_generic_keypad_init(section, Name)) != 0)
	return ret;

    /* register text widget */
    wc = Widget_Text;
    wc.draw = drv_generic_text_draw;
    widget_register(&wc);

    /* register icon widget */
    wc = Widget_Icon;
    wc.draw = drv_generic_text_icon_draw;
    widget_register(&wc);

    /* register bar widget */
    wc = Widget_Bar;
    wc.draw = drv_generic_text_bar_draw;
    widget_register(&wc);

    /* register plugins */
#ifdef WITH_PARPORT
    if (Capabilities & CAP_BACKLIGHT) {
	AddFunction("LCD::backlight", 1, plugin_backlight);
    }
#endif
    if (Capabilities & CAP_BRIGHTNESS) {
	AddFunction("LCD::brightness", 1, plugin_brightness);
    }

    return 0;
}


/* close driver & display */
int drv_HD_quit(const int quiet)
{

    info("%s: shutting down display.", Name);

    drv_generic_text_quit();
    drv_generic_gpio_quit();

    /* clear display */
    drv_HD_clear();

    /* say goodbye... */
    if (!quiet) {
	drv_generic_text_greet("goodbye!", NULL);
    }

    drv_HD_stop();

    return (0);
}


DRIVER drv_HD44780 = {
    .name = Name,
    .list = drv_HD_list,
    .init = drv_HD_init,
    .quit = drv_HD_quit,
};
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-17 16:45:24 +0000