/*
 * Base driver module for Toshiba T6963 based LCD displays. ver 2.2
 *
 * Parts of this file are based on the kernel driver by Alexander Frink <Alexander.Frink@Uni-Mainz.DE>
 *
 *
 * This file is released under the GNU General Public License. Refer to the
 * COPYING file distributed with this package.
 *
 * Copyright (c)  2001 Manuel Stahl <mythos@xmythos.de>
 *
 * 
 */

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
//#include <asm/io.h>
//#include <sys/perm.h>

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

#include "lcd.h"
#include "t6963.h"
#include "t6963_font.h"

#include "shared/debug.h"
#include "report.h"
#include "lcd_lib.h"
#include "port.h"


//extern int debug_level;

static u16 t6963_out_port;
static u16 t6963_display_mode;
static u8  *t6963_display_buffer1;
static u8  *t6963_display_buffer2;
static u8  t6963_graph_line[6];

static char *framebuf = NULL;
static int width;
static int height;
static int cellwidth;
static int cellheight;
static short bidirectLPT;
static short graphicON;

// 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 = "t6963_";

MODULE_EXPORT int
t6963_init (Driver *drvthis)
{
	int w, h, p, i, ecp_input;

	char size[200] = DEFAULT_SIZE;

		debug(RPT_INFO, "T6963: init(%p)", drvthis );

	t6963_display_mode = 0;
	t6963_graph_line[0] = 0x20;
	t6963_graph_line[1] = 0x30;
	t6963_graph_line[2] = 0x38;
	t6963_graph_line[3] = 0x3C;
	t6963_graph_line[4] = 0x3E;
	t6963_graph_line[5] = 0x3F;

	debug(RPT_DEBUG, "T6963: reading config file...");

	/* Read config file */

	/* -------------------------- Which size --------------------------------------*/
	strncpy(size, drvthis->config_get_string(drvthis->name, "Size", 0, DEFAULT_SIZE), sizeof(size));
	size[sizeof(size)-1] = '\0';
	if ((sscanf(size, "%dx%d", &w, &h) != 2)
	    || (w <= 0) || (w > LCD_MAX_WIDTH)
	    || (h <= 0) || (h > LCD_MAX_HEIGHT)) {
	  	report(RPT_WARNING, "%s: cannot read Size: %s, Using default %s",
				drvthis->name, size, DEFAULT_SIZE);
		sscanf(DEFAULT_SIZE, "%dx%d", &w, &h);
	}
	width = w;
	height = h;

	/* --------------------------- Which port --------------------------------------*/
	p = drvthis->config_get_int(drvthis->name, "Port", 0, DEFAULT_PORT);
	if ((p < 0x200) || (p > 0x400)) {
		p = DEFAULT_PORT;
		report(RPT_WARNING, "%s: Port value must be between 0x200 and 0x400. Using default 0x%03X",
				drvthis->name, DEFAULT_PORT);
	}
	t6963_out_port = p;

	/* ---------------------------- Is ECP mode on ----------------------------------*/
	bidirectLPT = drvthis->config_get_bool(drvthis->name, "ECPlpt", 0, 1);
	/* ---------------------------- Use graphic -------------------------------------*/
        graphicON = drvthis->config_get_bool(drvthis->name, "graphic", 0, 0);


	/* -- Get permission to parallel port --------------------------------------------*/
	debug(RPT_DEBUG, "T6963: Getting permission to parallel port %d...", t6963_out_port);

        if (port_access_multiple(t6963_out_port, 3)) {   //ioperm(t6963_out_port, 3, 1)) {
		report(RPT_ERR, "%s: no permission to port %d: (%s)",
				drvthis->name, t6963_out_port, strerror(errno));
               	return -1;
        }

        if (port_access(0x80)) {	//ioperm(0x80, 1, 1)) {
	       report(RPT_ERR, "%s: no permission to port 0x80: (%s)",
			       drvthis->name, strerror(errno));
                return -1;
        }
	debug(RPT_DEBUG, "T6963:   cool, got 'em!");


	/* -- Set charakter size --*/
	cellwidth = 6;
	cellheight = 8;

	/* -- Allocate framebuffer --*/
	debug(RPT_DEBUG, "T6963: Allocate framebuffer...");
	framebuf = malloc(width * height);
	if (framebuf == NULL) {
		report(RPT_ERR, "%s: No memory for framebuffer", drvthis->name);
		t6963_close(drvthis);
		return -1;
	}
	debug(RPT_DEBUG, "T6963:    done!");


	/* -- Allocate memory for double buffering --*/

	debug(RPT_DEBUG, "T6963: Allocating double buffering...");
	t6963_display_buffer1 = malloc(width * height);
	t6963_display_buffer2 = malloc(width * height);
	if ((t6963_display_buffer1 == NULL) || (t6963_display_buffer2 == NULL)) {
		report(RPT_ERR, "%s: No memory for double buffering", drvthis->name);
		t6963_close(drvthis);
		return -1;
	}
  	/* - Clear front and back buffer -*/
	memset(t6963_display_buffer1, ' ', width * height);
	memset(t6963_display_buffer2, ' ', width * height);
	debug(RPT_DEBUG, "T6963:     done!");

	/* ------------------- I N I T I A L I Z A T I O N ----------------------- */
	debug(RPT_DEBUG, "T6963: Sending init to display...");

        t6963_low_set_control(1, 1, 1, 1);
        T6963_DATAOUT; // make 8-bit parallel port an output port

	/* - Test ECP mode -*/
        if (bidirectLPT == 1) {
        	debug(RPT_WARNING, "T6963: Testing ECP mode...");
       		i=0; ecp_input=0;
		T6963_DATAIN;
		do {
		    	i++;
			t6963_low_set_control(1, 1, 1, 1);   // wr, ce, cd, rd
			t6963_low_set_control(1, 0, 1, 0);
			t6963_low_set_control(1, 0, 1, 0);
			t6963_low_set_control(1, 0, 1, 0);
			ecp_input = port_in(T6963_DATA_PORT);
			t6963_low_set_control(1, 1, 1, 1);
		} while (i < 100 && (ecp_input & 0x03)!=0x03);
		T6963_DATAOUT;
		if (i >= 100) {
			debug(RPT_WARNING, "T6963: ECP mode not working!\n -> is now disabled  (STA0: %i, STA1: %i\n", ecp_input & 1, ecp_input & 2);
			bidirectLPT = 0;
		}
		else
			debug(RPT_WARNING, "T6963: working!");
        }

	debug(RPT_DEBUG, "T6963:  set graphic/text home adress and area");

        t6963_low_command_word(SET_GRAPHIC_HOME_ADDRESS, ATTRIB_BASE);
        t6963_low_command_word(SET_GRAPHIC_AREA,         width);
        t6963_low_command_word(SET_TEXT_HOME_ADDRESS,    TEXT_BASE);
        t6963_low_command_word(SET_TEXT_AREA,            width);

        t6963_low_command         (SET_MODE | OR_MODE | EXTERNAL_CG);
        t6963_low_command_2_bytes (SET_OFFSET_REGISTER, CHARGEN_BASE>>11, 0);
        t6963_low_command         (SET_CURSOR_PATTERN | 7); // cursor is 8 lines high
        t6963_low_command_2_bytes (SET_CURSOR_POINTER, 0, 0);

        t6963_set_nchar(drvthis, 0, fontdata_6x8, 256);

        t6963_low_enable_mode(TEXT_ON);
        if (graphicON == 0)
		t6963_low_disable_mode(GRAPHIC_ON);
        else
		t6963_low_enable_mode(GRAPHIC_ON);
        t6963_low_disable_mode(CURSOR_ON);
        t6963_low_disable_mode(BLINK_ON);

        t6963_clear(drvthis);
        t6963_graphic_clear(drvthis, 0, 0, width, cellheight * height);
        t6963_flush(drvthis);

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

	return 1;						  // return success
}

// Below here, you may use either lcd.framebuf or driver->framebuf..
// lcd.framebuf will be set to the appropriate buffer before calling
// your driver.

MODULE_EXPORT void
t6963_close (Driver *drvthis)
{
	debug(RPT_INFO, "Shutting down!");
	t6963_low_disable_mode(BLINK_ON);

	port_deny_multiple(t6963_out_port,3);

	if (framebuf != NULL)
		free(framebuf);
	framebuf = NULL;
	
	if (t6963_display_buffer1 != NULL)
		free(t6963_display_buffer1);
	t6963_display_buffer1 = NULL;
	
	if (t6963_display_buffer2 != NULL)
		free(t6963_display_buffer2);
	t6963_display_buffer2 = NULL;
}

/////////////////////////////////////////////////////////////////
// Returns the display width
//
MODULE_EXPORT int
t6963_width (Driver *drvthis)
{
	return width;
}

/////////////////////////////////////////////////////////////////
// Returns the display height
//
MODULE_EXPORT int
t6963_height (Driver *drvthis)
{
	return height;
}

/////////////////////////////////////////////////////////////////
// Clears the LCD screen
//
MODULE_EXPORT void
t6963_clear (Driver *drvthis)
{
	debug(RPT_DEBUG, "Clearing Display of size %d x %d", width, height);
	memset(t6963_display_buffer1, ' ', width * height);
	debug(RPT_DEBUG, "Done");
}

void
t6963_graphic_clear(Driver *drvthis, int x1, int y1, int x2, int y2)
{
	int x;

	debug(RPT_DEBUG, "Clearing Graphic %d bytes", (x2-x1)*(y2-y1));
	for ( ; y1 < y2; y1++) {
		t6963_low_command_word(SET_ADDRESS_POINTER, ATTRIB_BASE + y1 * width + x1);
		for (x = x1; x < x2; x++)
			t6963_low_command_byte(DATA_WRITE_INC, 0);
	}
}

//////////////////////////////////////////////////////////////////
// Flushes all output to the lcd...
//
MODULE_EXPORT void
t6963_flush (Driver *drvthis)
{
	int i;
	debug(RPT_DEBUG, "Flushing %d x %d", width, height);

	for (i = 0; i < (width * height); i++) {
		// debug(RPT_DEBUG, "%i%i|", t6963_display_buffer1[i], t6963_display_buffer2[i]);
		if (t6963_display_buffer1[i] != t6963_display_buffer2[i]) {
			t6963_low_command_word(SET_ADDRESS_POINTER, TEXT_BASE + i);
			t6963_low_command_byte(DATA_WRITE, t6963_display_buffer1[i]);
		}
	}
	debug(RPT_DEBUG, "Done");
	t6963_swap_buffers();
	t6963_clear(drvthis);
}

/////////////////////////////////////////////////////////////////
// Prints a string on the lcd display, at position (x,y).  The
// upper-left is (1,1), and the lower right should be (20,6).
//
MODULE_EXPORT void
t6963_string (Driver *drvthis, int x, int y, char string[])
{
	debug(RPT_DEBUG, "String out");

	x -= 1;							  // Convert 1-based coords to 0-based...
	y -= 1;

	if ((y * width + x + strlen(string)) <= (width * height));
		memcpy(&t6963_display_buffer1[y * width + x], string, strlen(string));

}

/////////////////////////////////////////////////////////////////
// Prints a character on the lcd display, at position (x,y).  The
// upper-left is (1,1), and the lower right should be (20,6).
//
MODULE_EXPORT void
t6963_chr (Driver *drvthis, int x, int y, char c)
{
	debug(RPT_DEBUG, "Char out");
	y--;
	x--;
	if ((y * width) + x <= (width * height))
		t6963_display_buffer1[(y * width) + x] = c;
}

//////////////////////////////////////////////////////////////////////
// Draws a big (4-row) number.
//
MODULE_EXPORT void
t6963_num (Driver *drvthis, int x, int num)
{
//  printf("BigNum(%i, %i)\n", x, num);
}

//////////////////////////////////////////////////////////////////////
// Changes the font data of character n.
//
void
t6963_set_nchar (Driver *drvthis, int n, char *dat, int num)
{
	int row, col;
	char letter;

	debug(RPT_DEBUG, "Setting char %d", n);

        if ((!dat) || (n + num > 256))
                return;

	t6963_low_command_word(SET_ADDRESS_POINTER, CHARGEN_BASE + n*8);
        for (row = 0; row < cellheight * num; row++) {
                letter = 0;
                for (col = 0; col < cellwidth; col++) {
                        letter <<= 1;
                        letter |= (dat[(row * cellwidth) + col] > 0);
                }

		t6963_low_command_byte(DATA_WRITE_INC, letter);
        }
}

MODULE_EXPORT void
t6963_set_char (Driver *drvthis, int n, char *dat)
{
	t6963_set_nchar(drvthis, n, dat, 1);
}

/////////////////////////////////////////////////////////////////
// Draws a vertical bar, from the bottom of the screen up.
//
MODULE_EXPORT void
t6963_vbar (Driver *drvthis, int x, int y, int len, int promille, int options)
{
	lib_vbar_static(drvthis, x, y, len, promille, options, cellheight, 212);
}

/////////////////////////////////////////////////////////////////
// Draws a horizontal bar to the right.
//
MODULE_EXPORT void
t6963_hbar (Driver *drvthis, int x, int y, int len, int promille, int options)
{
	lib_hbar_static(drvthis, x, y, len, promille, options, cellwidth, 220);
}

/////////////////////////////////////////////////////////////////
// Sets an icon...
//
MODULE_EXPORT int
t6963_icon (Driver *drvthis, int x, int y, int icon)
{
	debug(RPT_DEBUG, "T6963: set icon %d", icon);
	switch (icon) {
		case ICON_BLOCK_FILLED:
			t6963_chr( drvthis, x, y, 219 );
			break;
		case ICON_HEART_FILLED:
			t6963_chr( drvthis, x, y, 3 );
			break;
		case ICON_HEART_OPEN:
			t6963_chr( drvthis, x, y, 4 );
			break;
		default:
			return -1;
	}
	return 0;
}

/* ---------------------- internal functions ------------------------------------- */
void
t6963_low_set_control(char wr, char ce, char cd, char rd)
{
	unsigned char status = port_in(T6963_CONTROL_PORT); /* TODO: support multiple wirings! */
	if (wr == 1)  /* WR = HI */
		status &= 0xfe;
	else if (wr == 0)
		status |= 0x01;
	if (ce == 1)  /* CE = HI */
		status &= 0xfd;
	else if (ce == 0)
		status |= 0x02;
	if (cd == 0)  /* CD = HI */
		status &= 0xfb;
	else if (cd == 1)
		status |= 0x04;
	if (rd == 1)  /* CE = HI */
		status &= 0xf7;
	else if (rd == 0)
		status |= 0x08;
	port_out(T6963_CONTROL_PORT, status);

}

void
t6963_low_dsp_ready (void)
{
    int i = 0;
    int input;

    T6963_DATAIN;
    if (bidirectLPT == 1) {
	    do {
	    	i++;
/*		t6963_low_set_control(1, 0, 1, -1);
		t6963_low_set_control(1, 0, 1, 0);
		input = port_in(T6963_DATA_PORT);
		t6963_low_set_control(1, 0, 1, -1); */
		t6963_low_set_control(1, 1, 1, 1);
		t6963_low_set_control(1, 0, 1, 0);
		t6963_low_set_control(1, 0, 1, 0);
		t6963_low_set_control(1, 0, 1, 0);
                // tacc max 150ns
		input = port_in(T6963_DATA_PORT);
		t6963_low_set_control(1, 1, 1, 1);

	    } while (i < 100 && (input & 3)!=3);
    } else {
   // 	for (i=0; i<3; i++)
		t6963_low_set_control(1, 1, 1, 1);
		t6963_low_set_control(1, 0, 1, 0);
		t6963_low_set_control(1, 1, 1, 1);
		port_out(0x80, 0x00);  // wait 1ms
    } 
    T6963_DATAOUT;
}

void
t6963_low_data (u8 byte)
{
    t6963_low_dsp_ready();
    t6963_low_set_control(1, 1, 0, 1);   // CD down (data)
    t6963_low_set_control(0, 0, 0, 1);   // CE & WR down
    port_out(T6963_DATA_PORT, byte);     // present data
    port_out(0x80, 0x00);
    t6963_low_set_control(1, 1, 1, 1);   // all up again

/*    port_out(T6963_DATA_PORT, byte);     // write value to data port
    t6963_low_set_control(1, 1,  0, 1);
    t6963_low_set_control(0, 0,  0, 1);
    t6963_low_set_control(1, 1,  1, 1); */
}

void
t6963_low_command (u8 byte)
{
    t6963_low_dsp_ready();

    t6963_low_set_control(1, 1, 1, 1);  // CD up (command)
    t6963_low_set_control(0, 0, 1, 1);  // CE & WR down
    port_out(T6963_DATA_PORT, byte);    // present data to LCD on PC's port pins
    port_out(0x80, 0x00);
    t6963_low_set_control(1, 1, 0, 1);  // CE & WR up, CD down
    
/*
    port_out(T6963_DATA_PORT, byte);  // present data to LCD on PC's port pins
    t6963_low_set_control(1, 1, 1, 1);
    t6963_low_set_control(0, 0, 1, 1);
    t6963_low_set_control(1, 1, 0, 1); */
}

void
t6963_low_command_byte(u8 cmd, u8 byte)
{
    t6963_low_data(byte);
    t6963_low_command(cmd);
}

void
t6963_low_command_2_bytes(u8 cmd, u8 byte1, u8 byte2)
{
    t6963_low_data(byte1);
    t6963_low_data(byte2);
    t6963_low_command(cmd);
}

void
t6963_low_command_word(u8 cmd, u16 word)
{
    t6963_low_data(word%256);
    t6963_low_data(word>>8);
    t6963_low_command(cmd);
}

void
t6963_low_enable_mode (u8 mode)
{
	t6963_display_mode |= mode;
	t6963_low_command(SET_DISPLAY_MODE | t6963_display_mode);
}

void
t6963_low_disable_mode (u8 mode)
{
	t6963_display_mode &= ~mode;
	t6963_low_command(SET_DISPLAY_MODE | t6963_display_mode);
}

void
t6963_swap_buffers ()
{
	u8 *tmp_buffer;
	tmp_buffer = t6963_display_buffer1;
	t6963_display_buffer1 = t6963_display_buffer2;
	t6963_display_buffer2 = tmp_buffer;
	tmp_buffer = NULL;
}