/* $Id: drv_Noritake.c 771 2007-02-25 12:27:26Z michael $
 * $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/drv_Noritake.c $
 * 
 * Driver for a Noritake GU128x32-311 graphical display.
 * 
 * Copyright (C) 2005 Julien Aube <ob@obconseil.net>
 * Copyright (C) 2005 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
 *
 * 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.
 *
 */

/*
 * *** Noritake Itron GU128x32-311 ***
 * A 128x32 VFD (Vacuum Fluorescent Display).
 * It is driver by a Hitachi microcontroller, with a specific 
 * firmware. 
 * The datasheet can be easily found on the internet by searching for the 
 * the name of the display, it's a PDF file that describe the timing, and 
 * the protocol to communicate with the Hitachi microcontroller.
 * 
 * The display support 2 modes (that can be mutiplexed), one text mode
 * thanks to an integrated character generator, and provide 4 lines of 
 * 21 caracters.
 * There is also a graphical mode that can be used to switch on or off
 * each one if the 128x32 pixels. (monochrome).
 * 
 * The protocol include the possibility to clear the display memory quickly,
 * change the luminosity, swich the display on or off (without affecting the 
 * content of the memory) and finally change the "page" or the caracter 
 * generator. Two pages are available in the ROM, all the characters are 
 * listed in the documentation.
 *
 * This driver support only the character mode at the moment.
 * A future release will support the graphical mode as an option.
 * 
 * This driver is released under the GPL.
 */

/* 
 *
 * exported fuctions:
 *
 * struct DRIVER drv_Noritake
 *
 */

#include "config.h"

#include <stdlib.h>
#include <unistd.h>
#include <string.h>

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


static char Name[] = "Noritake";

typedef struct {
    int type;
    char *name;
    int rows;
    int cols;
    int xres;
    int yrex;
    int goto_cost;
    int protocol;
} MODEL;

static int Model, Protocol;
static MODEL Models[] = {
    {0x01, "GU311", 4, 21, 6, 8, 5, 1},
    {0x02, "GU311_Graphic", 4, 21, 6, 8, 6, 1},
    {0xff, "Unknown", -1, -1, -1, -1, -1, -1}
};

static unsigned char SIGNAL_CS;	/* Chip select, OUTPUT, negative logic, pport AUTOFEED */
static unsigned char SIGNAL_WR;	/* Write        OUTPUT, negative logic, pport STOBE */
static unsigned char SIGNAL_RESET;	/* Reset,       OUTPUT, negative logic, pport INIT */
static unsigned char SIGNAL_BLANK;	/* Blank,       OUTPUT , negative logic, pport SELECT-IN */

#if 0
static unsigned char SIGNAL_BUSY;	/* Busy,        INPUT , positive logic, pport BUSY, not used */
static unsigned char SIGNAL_FRP;	/* Frame Pulse, INPUT , positive logic, pport ACK, not used */
#endif

void (*drv_Noritake_clear) (void);

/* Data port is positive logic */


/****************************************/
/***  hardware dependant functions    ***/
/****************************************/

/* Low-level parport driving functions */

/* This function was used to pool the BUSY line on the parallel port, which 
can be linked to the BUSY line on the display. But since it works 
with a timed wait, this function is not necessary, and is kept just in case.*/
#if 0
static void drv_GU311_wait_busy(void)
{
    char c;

    c = drv_generic_parport_status();
    while ((c & SIGNAL_BUSY) == 0) {
	ndelay(200);		/* Wait 100ns before next consultation of BUSY line 
				   if the first one was not successful */
	c = drv_generic_parport_status();
    }
}
#endif


static void drv_GU311_send_char(char c)
{
#if 0
    /* Disabled because all the cables does not have the busy line linked. */
    drv_GU311_wait_busy();	/* ensuite the display is ready to take the command */
#endif
    drv_generic_parport_data(c);
    ndelay(30);			/* delay to ensure data line stabilisation on long cables */
    drv_generic_parport_control(SIGNAL_WR, 0);	/* write line to enable */
    ndelay(150);		/* data hold time */
    drv_generic_parport_control(SIGNAL_WR, 0xff);	/* write line to disable */
    ndelay(75);			/* From spec : minimum time before next command */
}

static void drv_GU311_send_string(char *str, int size)
{
    int i;
    for (i = 0; i < size; i++)
	drv_GU311_send_char(str[i]);

}

/* Command-string elaboration functions */
static void drv_GU311_make_text_string(const int row, const int col, const char *data, int len)
{
    static char cmd[96] = { 0x01, 'C', 0, 0, 'S', 0 };
    unsigned char start_addr;

    /* Cols are 0x00..0x15, on 4 lines. */
    start_addr = (0x16 * row) + col;
    if (start_addr > 0x57)
	return;
    if (len > 0x57)
	return;

    cmd[2] = start_addr;
    cmd[3] = len;

    memcpy(cmd + 5, data, len);

    drv_GU311_send_string(cmd, len + 5);

}

/* API functions */

static void drv_GU311_clear(void)
{
    static char clear_cmd[] = { 0x01, 'O', 'P' };
    drv_GU311_send_string(clear_cmd, sizeof(clear_cmd));
    ndelay(500);		/* Delay for execution - this command is the longuest */
}


static void drv_GU311_write(const int row, const int col, const char *data, int len)
{
    drv_GU311_make_text_string(row, col, data, len);
}


static void drv_GU311_reset(void)
{
    drv_generic_parport_control(SIGNAL_RESET, 0);	/* initiate reset */
    ndelay(1000);		/* reset hold time 1ms */
    drv_generic_parport_control(SIGNAL_RESET, 0xff);
    ndelay(200000);		/* reset ready time 200ms */

}


static int drv_GU311_start(const char *section)
{
    char cmd[3] = { 0x01, 'O' };

    /* Parallel port opening and association */
    if (drv_generic_parport_open(section, Name) < 0)
	return -1;
    if ((SIGNAL_CS = drv_generic_parport_wire_ctrl("CS", "AUTOFD")) == 0xff)
	return -1;
    if ((SIGNAL_WR = drv_generic_parport_wire_ctrl("WR", "STROBE")) == 0xff)
	return -1;
    if ((SIGNAL_RESET = drv_generic_parport_wire_ctrl("RESET", "INIT")) == 0xff)
	return -1;
    if ((SIGNAL_BLANK = drv_generic_parport_wire_ctrl("BLANK", "SLCTIN")) == 0xff)
	return -1;
    /* SIGNAL_BUSY=PARPORT_STATUS_BUSY; *//* Not currently needed */
    /* SIGNAL_FRP=PARPORT_STATUS_ACK;   *//* Not currently needed */

    /* Signals configuration */
    drv_generic_parport_direction(0);	/* parallel port in output mode */
    drv_generic_parport_control(SIGNAL_CS | SIGNAL_WR | SIGNAL_RESET | SIGNAL_BLANK, 0xff);
    /* All lines to "deactivate", -> 1 level on the wire */
    drv_generic_parport_control(SIGNAL_CS, 0);	/* CS to 0 all the time, write done by WR */
    drv_GU311_reset();

    /* Ready for commands from now on. */

    /* Display configuration */
    cmd[2] = '0';
    drv_GU311_send_string(cmd, sizeof(cmd));	/* Select char. page 0 */
    cmd[2] = 'Q';
    drv_GU311_send_string(cmd, sizeof(cmd));	/* Select 'Quick Mode' */
    cmd[2] = 'a';
    drv_GU311_send_string(cmd, sizeof(cmd));	/* Brightness at 100% */
    cmd[2] = 'T';
    drv_GU311_send_string(cmd, sizeof(cmd));	/* Ensure display ON */

    drv_Noritake_clear();
    return 0;
}



static int drv_Noritake_start(const char *section)
{
    char *model = 0;
    int i;
    model = cfg_get(section, "Model", NULL);
    if (model != NULL && *model != '\0') {
	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;
	info("%s: using model '%s'", Name, Models[Model].name);
    } else {
	error("%s: no '%s.Model' entry from %s", Name, section, cfg_source());
	return -1;
    }

    DROWS = Models[Model].rows;
    DCOLS = Models[Model].cols;
    XRES = Models[Model].xres;
    YRES = Models[Model].xres;
    GOTO_COST = Models[Model].goto_cost;
    Protocol = Models[Model].protocol;
    /* display preferences */
    CHARS = 0;			/* number of user-defineable characters */
    CHAR0 = 0;			/* ASCII of first user-defineable char */



    /* real worker functions */
    drv_Noritake_clear = drv_GU311_clear;
    if (Models[Model].type == 0x01) {
	drv_generic_text_real_write = drv_GU311_write;
    } else {
	error("%s: Unsupported display. Currently supported are : GU311.", Name);
	return -1;
    }
    return drv_GU311_start(section);
}


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

/* none */


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


/* using drv_generic_text_draw(W) */


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


/* list models */
int drv_Noritake_list(void)
{
    printf("GU311 GU311_Graphic");
    return 0;
}


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

    info("%s: %s", Name, "$Rev: 771 $");

    /* start display */
    if ((ret = drv_Noritake_start(section)) != 0)
	return ret;

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

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

    /* register plugins */
    /* none */

    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_Noritake_clear();
	}
    }

    return 0;
}


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

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

    /* clear display */
    drv_Noritake_clear();

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

    drv_generic_parport_close();
    drv_generic_text_quit();
    return (0);
}


DRIVER drv_Noritake = {
    .name = Name,
    .list = drv_Noritake_list,
    .init = drv_Noritake_init,
    .quit = drv_Noritake_quit,
};