/** \file server/drivers/sed1520.c
 * LCDd \c sed1520 driver for graphic displays based on the SED1520.
 *
 * This is a driver for 122x32 pixel graphic displays based on the SED1520
 * controller connected to the parallel port. Check http://www.usblcd.de/lcdproc/
 * for where to buy and how to build the hardware. This Controller has no
 * built in character generator. Therefore all fonts and pixels are generated
 * by this driver.
 *
 * \todo Convert to 0.5 style hbar / vbar API.
 */

/*-
 * (C) 2001 Robin Adams ( robin@adams-online.de )
 *
 * The HD44780 font in sed1520fm.c was shamelessly stolen from
 * Michael Reinelt / lcd4linux and is (C) 2000 by him.
 *
 * This file is released under the GNU General Public License. Refer to the
 * COPYING file distributed with this package.
 */

/*-
 * Driver history:
 * Moved the delay timing code by Charles Steinkuehler to timing.h.
 * Guillaume Filion <gfk@logidac.com>, December 2001
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

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

#include "lcd.h"
#include "sed1520.h"
#include "report.h"
#include "port.h"
#include "timing.h"
#include "sed1520fm.h"

#define uPause timing_uPause
#define IODELAY 500

#ifndef DEFAULT_PORT
# define DEFAULT_PORT	0x378
#endif

#define CELLWIDTH	6
#define CELLHEIGHT	8

#define PIXELWIDTH	122
#define PIXELHEIGHT	32

#define WIDTH		((int) (PIXELWIDTH / CELLWIDTH))	/* 20 */
#define HEIGHT		((int) (PIXELHEIGHT / CELLHEIGHT))	/*  4 */

#define A0	0x08		/* nSEL */
#define CS2	0x04		/* INIT */
#define CS1	0x02		/* nLF */
#define WR	0x01		/* nSTRB */

/** private data for the \c sed1520 driver */
typedef struct sed1520_private_data {
    unsigned int port;

    unsigned char *framebuf;
} PrivateData;


/* Vars for the server core */
MODULE_EXPORT char *api_version = API_VERSION;
MODULE_EXPORT int stay_in_foreground = 0;
MODULE_EXPORT int supports_multiple = 0;
MODULE_EXPORT char *symbol_prefix = "sed1520_";

/**
 * Writes command value to one or both sed1520 selected by chip.
 * \param port   Output port base address
 * \param value  Command byte to write
 * \param chip   Bitmap of controllers to send value to
 */
void
writecommand(unsigned int port, int value, int chip)
{
    port_out(port, value);
    /*
     * lower WR, rise A0 and CS1 and/or CS2. Take bit inversion of parallel
     * port into account.
     */
    port_out(port + 2, WR + CS1 - (chip & CS1) + (chip & CS2));
    /* rise WR */
    port_out(port + 2, CS1 - (chip & CS1) + (chip & CS2));
    uPause(IODELAY);
    /* lower WR again */
    port_out(port + 2, WR + CS1 - (chip & CS1) + (chip & CS2));
    uPause(IODELAY);
}

/**
 * Writes data value to one or both sed 1520 selected by chip.
 * \param port   Output port base address
 * \param value  Data byte to write
 * \param chip   Bitmap of controllers to send value to
 */
void
writedata(unsigned int port, int value, int chip)
{
    port_out(port, value);
    /*
     * lower WR and A0, rise CS1 and/or CS2. Take bit inversion of parallel
     * port into account.
     */
    port_out(port + 2, A0 + WR + CS1 - (chip & CS1) + (chip & CS2));
    port_out(port + 2, A0 + CS1 - (chip & CS1) + (chip & CS2));
    uPause(IODELAY);
    port_out(port + 2, A0 + WR + CS1 - (chip & CS1) + (chip & CS2));
    uPause(IODELAY);
}

/**
 * Selects a page (=row) on both sed1520s.
 * \param port  Output port base address
 * \param page  Page (=row) number (0-3)
 */
void
selectpage(unsigned int port, int page)
{
    writecommand(port, 0xB8 + (page & 0x03), CS1 + CS2);
}

/**
 * Selects a column on the sed1520s specified by chip.
 * \param port    Output port base address
 * \param column  Select column (segment) in controller (0-79)
 * \param chip    Bitmap of controllers to send value to
 */
void
selectcolumn(unsigned int port, int column, int chip)
{
    writecommand(port, (column & 0x7F), chip);
}

/**
 * Draws character z from fontmap to the framebuffer at position x,y.
 * The Fontmap is stored in rows while the framebuffer is stored in columns,
 * so we need a little conversion.
 *
 * \param framebuf  Pointer to framebuffer
 * \param x         Character column (zero-based)
 * \param y         Line (zero-based)
 * \param z         Character index in fontmap
 */
void
drawchar2fb(unsigned char *framebuf, int x, int y, unsigned char z)
{
    int i, j;

    if ((x < 0) || (x >= WIDTH) || (y < 0) || (y >= HEIGHT))
	return;

    /* for each raster column */
    for (i = CELLWIDTH; i > 0; i--) {
	int k = 0;

	/* gather the bits from the fontmap for each raster row */
	for (j = 0; j < CELLHEIGHT; j++)
	    k |= ((fontmap[(int)z][j] >> (i - 1)) & 0x01) << j;

	/* And store it in framebuffer pixel column */
	framebuf[(y * PIXELWIDTH) + (x * CELLWIDTH) + (CELLWIDTH - i)] = k;
    }
}

/**
 * API: Initialize the driver.
 */
MODULE_EXPORT int
sed1520_init(Driver * drvthis)
{
    PrivateData *p;

    /* Allocate and store private data */
    p = (PrivateData *) calloc(1, sizeof(PrivateData));
    if (p == NULL)
	return -1;
    if (drvthis->store_private_ptr(drvthis, p))
	return -1;

    /* What port to use */
    p->port = drvthis->config_get_int(drvthis->name, "Port", 0, DEFAULT_PORT);

    /* Initialize timing */
    if (timing_init() == -1) {
	report(RPT_ERR, "%s: timing_init() failed (%s)", drvthis->name, strerror(errno));
	return -1;
    }

    /* Allocate our framebuffer */
    p->framebuf = (unsigned char *) calloc(PIXELWIDTH * HEIGHT, sizeof(unsigned char));
    if (p->framebuf == NULL) {
	report(RPT_ERR, "%s: unable to allocate framebuffer", drvthis->name);
	return -1;
    }

    /* Clear screen */
    memset(p->framebuf, '\0', PIXELWIDTH * HEIGHT);

    /* Open port */
    if (port_access(p->port) || port_access(p->port + 2)) {
	report(RPT_ERR, "%s: unable to access port 0x%03X", drvthis->name, p->port);
	return -1;
    }

    /* Initialize display */
    port_out(p->port, 0);
    port_out(p->port + 2, WR + CS2);
    writecommand(p->port, 0xE2, CS1 + CS2);	/* software reset */
    writecommand(p->port, 0xAF, CS1 + CS2);	/* display on */
    writecommand(p->port, 0xC0, CS1 + CS2);	/* display start address */
    selectpage(p->port, 3);

    report(RPT_DEBUG, "%s: init() done", drvthis->name);
    return 0;
}

/**
 * API: Frees the frambuffer and exits the driver.
 */
MODULE_EXPORT void
sed1520_close(Driver * drvthis)
{
    PrivateData *p = drvthis->private_data;

    if (p != NULL) {
	if (p->framebuf != NULL)
	    free(p->framebuf);

	free(p);
    }
    drvthis->store_private_ptr(drvthis, NULL);
}

/**
 * API: Returns the display width
 */
MODULE_EXPORT int
sed1520_width(Driver * drvthis)
{
    return WIDTH;
}

/**
 * API: Returns the display height
 */
MODULE_EXPORT int
sed1520_height(Driver * drvthis)
{
    return HEIGHT;
}

/**
 * API: Return the width of a character in pixels.
 */
MODULE_EXPORT int
sed1520_cellwidth(Driver * drvthis)
{
    return CELLWIDTH;
}

/**
 * API: Return the height of a character in pixels.
 */
MODULE_EXPORT int
sed1520_cellheight(Driver * drvthis)
{
    return CELLHEIGHT;
}

/**
 * API: Clears the LCD screen
 */
MODULE_EXPORT void
sed1520_clear(Driver * drvthis)
{
    PrivateData *p = drvthis->private_data;

    memset(p->framebuf, '\0', PIXELWIDTH * HEIGHT);
}

/**
 * API: Flushes all output to the lcd. No conversion needed here as
 * framebuffer is prepared by \c drawchar2fb.
 */
MODULE_EXPORT void
sed1520_flush(Driver * drvthis)
{
    PrivateData *p = drvthis->private_data;
    int i, j;

    for (i = 0; i < HEIGHT; i++) {
	/* select line */
	selectpage(p->port, i);

	/* update left half of display */
	selectcolumn(p->port, 0, CS2);
	for (j = 0; j < PIXELWIDTH / 2; j++)
	    writedata(p->port, p->framebuf[j + (i * PIXELWIDTH)], CS2);

	/* update right half of display */
	selectcolumn(p->port, 0, CS1);
	for (j = PIXELWIDTH / 2; j < PIXELWIDTH; j++)
	    writedata(p->port, p->framebuf[j + (i * PIXELWIDTH)], CS1);
    }
}

/**
 * API: Prints a string on the lc display, at position (x,y). The
 * upper-left is (1,1), and the lower right should be (20,4).
 */
MODULE_EXPORT void
sed1520_string(Driver * drvthis, int x, int y, const char string[])
{
    PrivateData *p = drvthis->private_data;
    int i;

    x--;			/* Convert 1-based coords to 0-based */
    y--;

    for (i = 0; string[i] != '\0'; i++)
	drawchar2fb(p->framebuf, x + i, y, string[i]);
}

/**
 * API: Writes  char c at position x,y into the framebuffer.
 * x and y are 1-based textmode coordinates.
 */
MODULE_EXPORT void
sed1520_chr(Driver * drvthis, int x, int y, char c)
{
    PrivateData *p = drvthis->private_data;

    y--;
    x--;
    drawchar2fb(p->framebuf, x, y, c);
}

/**
 * API: This function draws a number num into the last 3 rows of the
 * framebuffer at 1-based position x. It should draw a 4-row font, but me
 * thinks this would look a little stretched. When num=10 a colon is drawn.
 *
 * FIXME: make big numbers use less memory
 */
MODULE_EXPORT void
sed1520_num(Driver * drvthis, int x, int num)
{
    PrivateData *p = drvthis->private_data;
    int z, c, i, s;

    x--;

    /* return on illegal char or illegal position */
    if ((x >= WIDTH) || (num < 0) || (num > 10))
	return;

    if (num == 10) {		/* colon */
	for (z = 0; z < 3; z++) {	/* 3 rows at 8 dots */
	    for (c = 0; c < 6; c++) {	/* 6 columns */
		s = 0;
		/* convert font definition to bitmap */
		for (i = 0; i < 8; i++) {
		    s >>= 1;
		    if (*(fontbigdp[(z * 8) + i] + c) == '.')
			s |= 0x80;
		}
		/* Draw directly into framebuffer */
		if ((x * CELLWIDTH + c >= 0) && (x * CELLWIDTH + c < PIXELWIDTH))
		    p->framebuf[((z + 1) * PIXELWIDTH) + (x * CELLWIDTH) + c] = s;
	    }
	}
    }
    else {			/* digits 0 - 9 */
	for (z = 0; z < 3; z++) {	/* 3 rows at 8 dots */
	    for (c = 0; c < 18; c++) {	/* 18 columns */
		s = 0;
		for (i = 0; i < 8; i++) {
		    s >>= 1;
		    if (*(fontbignum[num][z * 8 + i] + c) == '.')
			s |= 0x80;
		}
		if ((x * CELLWIDTH + c >= 0) && (x * CELLWIDTH + c < PIXELWIDTH))
		    p->framebuf[((z + 1) * PIXELWIDTH) + (x * CELLWIDTH) + c] = s;
	    }
	}
    }
}


/**
 * API: Changes the font of character n to a pattern given by *dat.
 * HD44780 Controllers only posses 8 programmable chars. But we store the
 * fontmap completely in RAM, so every character can be altered.
 *
 * Important: Characters have to be redrawn by drawchar2fb() to show their
 * new shape. Because we use a non-standard 6x8 font a *dat not calculated
 * from width and height will fail.
 */
MODULE_EXPORT void
sed1520_set_char(Driver * drvthis, int n, char *dat)
{
    int row, col;

    if (n < 0 || n > 255)
	return;
    if (!dat)
	return;

    for (row = 0; row < CELLHEIGHT; row++) {
	int i = 0;

	for (col = 0; col < CELLWIDTH; col++)
	    i = (i << 1) | (dat[(row * CELLWIDTH) + col] > 0);

	fontmap[n][row] = i;
    }
}


/*
 * Draws a vertical from the bottom up to the last 3 rows of the framebuffer
 * at 1-based position x. len is given in pixels.
 */
MODULE_EXPORT void
sed1520_old_vbar(Driver * drvthis, int x, int len)
{
    PrivateData *p = drvthis->private_data;
    int i, j, k;

    x--;

    for (j = 0; j < 3; j++) {
	k = 0;
	/* Set height of block. Bottom is leftmost bit */
	for (i = 0; i < CELLHEIGHT; i++) {
	    if (len > i)
		k |= (1 << (CELLHEIGHT - 1 - i));
	}

	/* Draw directly into framebuffer starting from bottom */
	p->framebuf[((3 - j) * PIXELWIDTH) + (x * CELLWIDTH) + 0] = 0;
	p->framebuf[((3 - j) * PIXELWIDTH) + (x * CELLWIDTH) + 1] = 0;
	p->framebuf[((3 - j) * PIXELWIDTH) + (x * CELLWIDTH) + 2] = k;
	p->framebuf[((3 - j) * PIXELWIDTH) + (x * CELLWIDTH) + 3] = k;
	p->framebuf[((3 - j) * PIXELWIDTH) + (x * CELLWIDTH) + 4] = k;
	p->framebuf[((3 - j) * PIXELWIDTH) + (x * CELLWIDTH) + 5] = 0;

	len -= CELLHEIGHT;
    }
}


/*
 * Draws a horizontal bar from left to right at 1-based position x,y into the
 * framebuffer. len is given in pixels.
 */
MODULE_EXPORT void
sed1520_old_hbar(Driver * drvthis, int x, int y, int len)
{
    PrivateData *p = drvthis->private_data;
    int i;

    x--;
    y--;

    if ((y < 0) || (y >= HEIGHT) || (x < 0) || (len < 0) || ((x + (len / CELLWIDTH)) >= WIDTH))
	return;

    /* Draw directly into framebuffer. Use 4 dots in the middle (0x3C). */
    for (i = 0; i < len; i++)
	p->framebuf[(y * PIXELWIDTH) + (x * CELLWIDTH) + i] = 0x3C;
}

/**
 * API: Place an icon on the screen.
 */
MODULE_EXPORT int
sed1520_icon(Driver * drvthis, int x, int y, int icon)
{
    static char heart_open[] =
    {
	1, 1, 1, 1, 1,
	1, 0, 1, 0, 1,
	0, 0, 0, 0, 0,
	0, 0, 0, 0, 0,
	0, 0, 0, 0, 0,
	1, 0, 0, 0, 1,
	1, 1, 0, 1, 1,
	1, 1, 1, 1, 1
    };

    static char heart_filled[] =
    {
	1, 1, 1, 1, 1,
	1, 0, 1, 0, 1,
	0, 1, 0, 1, 0,
	0, 1, 1, 1, 0,
	0, 1, 1, 1, 0,
	1, 0, 1, 0, 1,
	1, 1, 0, 1, 1,
	1, 1, 1, 1, 1
    };

    switch (icon) {
	case ICON_BLOCK_FILLED:
	    sed1520_chr(drvthis, x, y, 255);
	    break;
	case ICON_HEART_FILLED:
	    sed1520_set_char(drvthis, 0, heart_filled);
	    sed1520_chr(drvthis, x, y, 0);
	    break;
	case ICON_HEART_OPEN:
	    sed1520_set_char(drvthis, 0, heart_open);
	    sed1520_chr(drvthis, x, y, 0);
	    break;
	default:
	    return -1;
    }
    return 0;
}