/* $Id: drv_T6963.c,v 1.13 2004/12/22 20:24:02 reinelt Exp $
 *
 * new style driver for T6963-based displays
 *
 * Copyright 1999-2004 Michael Reinelt <reinelt@eunet.at>
 * Copyright 2004 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.
 *
 *
 * $Log: drv_T6963.c,v $
 * Revision 1.13  2004/12/22 20:24:02  reinelt
 * T6963 fix for displays > 8 rows
 *
 * Revision 1.12  2004/06/26 12:04:59  reinelt
 *
 * uh-oh... the last CVS log message messed up things a lot...
 *
 * Revision 1.11  2004/06/26 09:27:21  reinelt
 *
 * added '-W' to CFLAGS
 * changed all C++ comments to C ones
 * cleaned up a lot of signed/unsigned mistakes
 *
 * Revision 1.10  2004/06/20 10:09:54  reinelt
 *
 * 'const'ified the whole source
 *
 * Revision 1.9  2004/06/17 06:23:39  reinelt
 *
 * hash handling rewritten to solve performance issues
 *
 * Revision 1.8  2004/06/09 06:40:29  reinelt
 *
 * splash screen for T6963 driver
 *
 * Revision 1.7  2004/06/06 06:51:59  reinelt
 *
 * do not display end splash screen if quiet=1
 *
 * Revision 1.6  2004/06/02 09:41:19  reinelt
 *
 * prepared support for startup splash screen
 *
 * Revision 1.5  2004/06/01 06:45:30  reinelt
 *
 * some Fixme's processed
 * documented some code
 *
 * Revision 1.4  2004/02/24 05:55:04  reinelt
 *
 * X11 driver ported
 *
 * Revision 1.3  2004/02/22 17:35:41  reinelt
 * some fixes for generic graphic driver and T6963
 * removed ^M from plugin_imon (Nico, are you editing under Windows?)
 *
 * Revision 1.2  2004/02/18 06:39:20  reinelt
 * T6963 driver for graphic displays finished
 *
 * Revision 1.1  2004/02/15 21:43:43  reinelt
 * T6963 driver nearly finished
 * framework for graphic displays done
 * i2c_sensors patch from Xavier
 * some more old generation files removed
 *
 */

/* 
 *
 * exported fuctions:
 *
 * struct DRIVER drv_T6963
 *
 */

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

#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif

static char Name[]="T6963";
static int Model;

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

static MODEL Models[] = {
  { 0x01, "generic" },
  { 0xff, "Unknown" }
};


static unsigned char SIGNAL_CE;
static unsigned char SIGNAL_CD;
static unsigned char SIGNAL_RD;
static unsigned char SIGNAL_WR;

unsigned char *Buffer1, *Buffer2;

static int bug=0;


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

/* perform normal status check */
static void drv_T6_status1 (void)
{
  int n;
  
  /* turn off data line drivers */
  drv_generic_parport_direction (1);
  
  /* lower CE and RD */
  drv_generic_parport_control (SIGNAL_CE | SIGNAL_RD, 0);
  
  /* Access Time: 150 ns  */
  ndelay(150);
  
  /* wait for STA0=1 and STA1=1 */
  n=0;
  do {
    rep_nop();
    if (++n>1000) {
      debug("hang in status1");
      bug=1;
      break;
    }
  } while ((drv_generic_parport_read() & 0x03) != 0x03);
  
  /* rise RD and CE */
  drv_generic_parport_control (SIGNAL_RD | SIGNAL_CE, SIGNAL_RD | SIGNAL_CE);
  
  /* Output Hold Time: 50 ns  */
  ndelay(50);
  
  /* turn on data line drivers */
  drv_generic_parport_direction (0);
}


/* perform status check in "auto mode" */
static void drv_T6_status2 (void)
{
  int n;

  /* turn off data line drivers */
  drv_generic_parport_direction (1);
  
  /* lower RD and CE */
  drv_generic_parport_control (SIGNAL_RD | SIGNAL_CE, 0);
  
  /* Access Time: 150 ns  */
  ndelay(150);

  /* wait for STA3=1 */
  n=0;
  do {
    rep_nop();
    if (++n>1000) {
      debug("hang in status2");
      bug=1;
      break;
    }
  } while ((drv_generic_parport_read() & 0x08) != 0x08);

  /* rise RD and CE */
  drv_generic_parport_control (SIGNAL_RD | SIGNAL_CE, SIGNAL_RD | SIGNAL_CE);

  /* Output Hold Time: 50 ns  */
  ndelay(50);

  /* turn on data line drivers */
  drv_generic_parport_direction (0);
}


static void drv_T6_write_cmd (const unsigned char cmd)
{
  /* wait until the T6963 is idle */
  drv_T6_status1();

  /* put data on DB1..DB8 */
  drv_generic_parport_data (cmd);
  
  /* lower WR and CE */
  drv_generic_parport_control (SIGNAL_WR | SIGNAL_CE, 0);
  
  /* Pulse width */
  ndelay(80);

  /* rise WR and CE */
  drv_generic_parport_control (SIGNAL_WR | SIGNAL_CE, SIGNAL_WR | SIGNAL_CE);

  /* Data Hold Time */
  ndelay(40);
}


static void drv_T6_write_data (const unsigned char data)
{
  /* wait until the T6963 is idle */
  drv_T6_status1();

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

  /* lower C/D */
  drv_generic_parport_control (SIGNAL_CD, 0);
  
  /* C/D Setup Time */
  ndelay(20);

  /* lower WR and CE */
  drv_generic_parport_control (SIGNAL_WR | SIGNAL_CE, 0);
  
  /* Pulse Width */
  ndelay(80);
  
  /* rise WR and CE */
  drv_generic_parport_control (SIGNAL_WR | SIGNAL_CE, SIGNAL_WR | SIGNAL_CE);
  
  /* Data Hold Time */
  ndelay(40);

  /* rise CD */
  drv_generic_parport_control (SIGNAL_CD, SIGNAL_CD);
}


static void drv_T6_write_auto (const unsigned char data)
{
  /* wait until the T6963 is idle */
  drv_T6_status2();

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

  /* lower C/D */
  drv_generic_parport_control (SIGNAL_CD, 0);
  
  /* C/D Setup Time */
  ndelay(20);

  /* lower WR and CE */
  drv_generic_parport_control (SIGNAL_WR | SIGNAL_CE, 0);
  
  /* Pulse Width */
  ndelay(80);
  
  /* rise WR and CE */
  drv_generic_parport_control (SIGNAL_WR | SIGNAL_CE, SIGNAL_WR | SIGNAL_CE);
  
  /* Data Hold Time */
  ndelay(40);

  /* rise CD */
  drv_generic_parport_control (SIGNAL_CD, SIGNAL_CD);
}


#if 0 /* not used */
static void drv_T6_send_byte (const unsigned char cmd, const unsigned char data)
{
  drv_T6_write_data(data);
  drv_T6_write_cmd(cmd);
}
#endif

static void drv_T6_send_word (const unsigned char cmd, const unsigned short data)
{
  drv_T6_write_data(data&0xff);
  drv_T6_write_data(data>>8);
  drv_T6_write_cmd(cmd);
}


static void drv_T6_clear(const unsigned short addr, const int len)
{
  int i;
  
  drv_T6_send_word (0x24, addr);      /* Set Adress Pointer */
  drv_T6_write_cmd(0xb0);             /* Set Data Auto Write */
  for (i=0; i<len; i++) {
    drv_T6_write_auto(0);
    if (bug) {
      bug=0;
      debug("bug occured at byte %d of %d", i, len);
    }
  }
  drv_T6_status2();
  drv_T6_write_cmd(0xb2);             /* Auto Reset */
}


static void drv_T6_copy(const unsigned short addr, const unsigned char *data, const int len)
{
  int i;
  
  drv_T6_send_word (0x24, 0x0200+addr);  /* Set Adress Pointer */
  drv_T6_write_cmd(0xb0);                /* Set Data Auto Write */
  for (i=0; i<len; i++) {
    drv_T6_write_auto(*(data++));
    if (bug) {
      bug=0;
      debug("bug occured at byte %d of %d, addr=%d", i, len, addr);
    }
  }
  drv_T6_status2();
  drv_T6_write_cmd(0xb2);  /* Auto Reset */
}


static void drv_T6_blit(const int row, const int col, const int height, const int width)
{
  int i, j, e, m;
  int r, c;

  for (r = row; r < row + height; r++) {
    for (c = col; c < col + width; c++) {
      unsigned char mask = 1 << (XRES - 1 - c % XRES);
      if (drv_generic_graphic_FB[r * LCOLS + c]) {
	/* set bit */
	Buffer1[(r * DCOLS + c) / XRES] |=  mask;
      } else {
	/* clear bit */
	Buffer1[(r * DCOLS + c) / XRES] &= ~mask;
      }
    }
  }
  
  /* upper half */

  /* max address */
  if (row + height - 1 < 64) {
    m = ((row + height - 1) * DCOLS + col + width) / XRES;
  } else {
    m = (                64 * DCOLS + col + width) / XRES;
  }

  for (i = (row * DCOLS + col) / XRES; i <= m; i++) {
    if (Buffer1[i] == Buffer2[i]) continue;
    for (j = i, e = 0; i <= m; i++) {
      if (Buffer1[i] == Buffer2[i]) {
	if (++e > 4) break;
      } else {
	e = 0;
      }
    }
    memcpy (Buffer2 + j, Buffer1 + j, i - j - e + 1);
    drv_T6_copy (j, Buffer1 + j, i - j - e + 1);
  }
  
  /* lower half */

  /* max address */
  m = ((row + height - 1) * DCOLS + col + width) / XRES;

  for (i = (64 * DCOLS + col) / XRES; i <= m; i++) {
    if (Buffer1[i] == Buffer2[i]) continue;
    for (j = i, e = 0; i <= m; i++) {
      if (Buffer1[i] == Buffer2[i]) {
	if (++e > 4) break;
      } else {
	e = 0;
      }
    }
    memcpy (Buffer2 + j, Buffer1 + j, i - j - e + 1);
    drv_T6_copy (j, Buffer1 + j, i - j - e + 1);
  }
}


static int drv_T6_start (const char *section)
{
  char *model, *s;
  int rows, TROWS, TCOLS;
  
  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;
    info ("%s: using model '%s'", Name, Models[Model].name);
  } else {
    error ("%s: empty '%s.Model' entry from %s", Name, section, cfg_source());
    return -1;
  }

  /* read display size from config */
  s=cfg_get(section, "Size", NULL);
  if (s==NULL || *s=='\0') {
    error ("%s: no '%s.Size' entry from %s", Name, section, cfg_source());
    return -1;
  }

  DROWS = -1;
  DCOLS = -1;
  if (sscanf(s, "%dx%d", &DCOLS, &DROWS)!=2 || DCOLS<1 || DROWS<1) {
    error ("%s: bad Size '%s' from %s", Name, s, cfg_source());
    return -1;
  }
  
  s=cfg_get(section, "Font", "6x8");
  if (s==NULL || *s=='\0') {
    error ("%s: no '%s.Font' entry from %s", Name, section, cfg_source());
    return -1;
  }

  XRES = -1;
  YRES = -1;
  if (sscanf(s, "%dx%d", &XRES, &YRES)!=2 || XRES<1 || YRES<1) {
    error ("%s: bad Font '%s' from %s", Name, s, cfg_source());
    return -1;
  }

  /* Fixme: provider other fonts someday... */
  if (XRES!=6 && YRES!=8) {
    error ("%s: bad Font '%s' from %s (only 6x8 at the moment)", Name, s, cfg_source());
    return -1;
  }
  
  TROWS=DROWS/YRES;  /* text rows */
  TCOLS=DCOLS/XRES;  /* text cols */

  Buffer1=malloc(TCOLS*DROWS);
  if (Buffer1==NULL) {
    error ("%s: framebuffer #1 could not be allocated: malloc() failed", Name);
    return -1;
  }

  debug ("malloc buffer 2 (%d*%d)=%d", TCOLS, DROWS, TCOLS*DROWS);
  Buffer2=malloc(TCOLS*DROWS);
  if (Buffer2==NULL) {
    error ("%s: framebuffer #2 could not be allocated: malloc() failed", Name);
    return -1;
  }

  memset(Buffer1,0,TCOLS*DROWS*sizeof(*Buffer1));
  memset(Buffer2,0,TCOLS*DROWS*sizeof(*Buffer2));

  if (drv_generic_parport_open(section, Name) != 0) {
    error ("%s: could not initialize parallel port!", Name);
    return -1;
  }
  
  if ((SIGNAL_CE=drv_generic_parport_wire_ctrl ("CE", "STROBE"))==0xff) return -1;
  if ((SIGNAL_CD=drv_generic_parport_wire_ctrl ("CD", "SELECT"))==0xff) return -1;
  if ((SIGNAL_RD=drv_generic_parport_wire_ctrl ("RD", "AUTOFD"))==0xff) return -1;
  if ((SIGNAL_WR=drv_generic_parport_wire_ctrl ("WR", "INIT")  )==0xff) return -1;
  
  /* rise CE, CD, RD and WR */
  drv_generic_parport_control (SIGNAL_CE | SIGNAL_CD | SIGNAL_RD | SIGNAL_WR,
			       SIGNAL_CE | SIGNAL_CD | SIGNAL_RD | SIGNAL_WR);
  /* set direction: write */
  drv_generic_parport_direction (0);
  

  /* initialize display */

  drv_T6_send_word (0x40, 0x0000);    /* Set Text Home Address */
  drv_T6_send_word (0x41, TCOLS);     /* Set Text Area */
  
  drv_T6_send_word (0x42, 0x0200);    /* Set Graphic Home Address */
  drv_T6_send_word (0x43, TCOLS);     /* Set Graphic Area */
  
  drv_T6_write_cmd (0x80);            /* Mode Set: OR mode, Internal CG RAM mode */
  drv_T6_send_word (0x22, 0x0002);    /* Set Offset Register */
  drv_T6_write_cmd (0x98);            /* Set Display Mode: Curser off, Text off, Graphics on */
  drv_T6_write_cmd (0xa0);            /* Set Cursor Pattern: 1 line cursor */
  drv_T6_send_word (0x21, 0x0000);    /* Set Cursor Pointer to (0,0) */
  
  
  /* clear display */
  
  /* upper half */
  rows=TROWS>8?8:TROWS;
  drv_T6_clear(0x0000, TCOLS*rows);    /* clear text area  */
  drv_T6_clear(0x0200, TCOLS*rows*8);  /* clear graphic area */
  
  /* lower half */
  if (TROWS>8) {
    rows=TROWS-8;
    drv_T6_clear(0x8000, TCOLS*rows);    /* clear text area #2 */
    drv_T6_clear(0x8200, TCOLS*rows*8);  /* clear graphic area #2 */
  }

  return 0;
}


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

/* none at the moment... */


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


/* using drv_generic_graphic_draw(W) */
/* using drv_generic_graphic_icon_draw(W) */
/* using drv_generic_graphic_bar_draw(W) */


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


/* list models */
int drv_T6_list (void)
{
  int i;
  
  for (i=0; Models[i].type!=0xff; i++) {
    printf ("%s ", Models[i].name);
  }
  return 0;
}


/* initialize driver & display */
int drv_T6_init (const char *section, const int quiet)
{
  WIDGET_CLASS wc;
  int ret;  
  
  /* real worker functions */
  drv_generic_graphic_real_blit   = drv_T6_blit;
  
  /* start display */
  if ((ret=drv_T6_start (section))!=0)
    return ret;
  
  /* initialize generic graphic driver */
  if ((ret=drv_generic_graphic_init(section, Name))!=0)
    return ret;
  
  if (!quiet) {
    char buffer[40];
    qprintf(buffer, sizeof(buffer), "%s %dx%d", Name, DCOLS, DROWS);
    if (drv_generic_graphic_greet (buffer, NULL)) {
      sleep (3);
      drv_generic_graphic_clear();
    }
  }

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

  /* register icon widget */
  wc=Widget_Icon;
  wc.draw=drv_generic_graphic_icon_draw;
  widget_register(&wc);
  
  /* register bar widget */
  wc=Widget_Bar;
  wc.draw=drv_generic_graphic_bar_draw;
  widget_register(&wc);
  
  /* register plugins */
  /* none at the moment... */


  return 0;
}


/* close driver & display */
int drv_T6_quit (const int quiet) {
  
  info("%s: shutting down.", Name);
  
  drv_generic_graphic_clear();
  
  if (!quiet) {
    drv_generic_graphic_greet ("goodbye!", NULL);
  }
  
  drv_generic_graphic_quit();
  drv_generic_parport_close();
  
  if (Buffer1) {
    free (Buffer1);
    Buffer1=NULL;
  }
  
  if (Buffer2) {
    free (Buffer2);
    Buffer2=NULL;
  }
  
  return (0);
}


DRIVER drv_T6963 = {
  name: Name,
  list: drv_T6_list,
  init: drv_T6_init,
  quit: drv_T6_quit, 
};