/* $Id: M50530.c,v 1.4 2002/08/19 07:36:29 reinelt Exp $
 *
 * driver for display modules based on the M50530 chip
 *
 * Copyright 1999, 2000 by Michael Reinelt (reinelt@eunet.at)
 *
 * This program 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.
 *
 * This program 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: M50530.c,v $
 * Revision 1.4  2002/08/19 07:36:29  reinelt
 *
 * finished bar.c, USBLCD is the first driver that uses the generic bar functions
 *
 * Revision 1.3  2002/08/19 04:41:20  reinelt
 * introduced bar.c, moved bar stuff from display.h to bar.h
 *
 * Revision 1.2  2002/04/30 07:20:15  reinelt
 *
 * implemented the new ndelay(nanoseconds) in all parallel port drivers
 *
 * Revision 1.1  2001/09/11 05:31:37  reinelt
 * M50530 driver
 *
 *
 */

/* 
 *
 * exported fuctions:
 *
 * struct LCD M50530[]
 *
 */

#include "config.h"

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

#if defined (HAVE_LINUX_PARPORT_H) && defined (HAVE_LINUX_PPDEV_H)
#define WITH_PPDEV
#include <linux/parport.h>
#include <linux/ppdev.h>
#else
#error The M50530 driver needs ppdev
#error cannot compile M50530 driver
#endif

#include "debug.h"
#include "cfg.h"
#include "display.h"
#include "bar.h"
#include "udelay.h"

#define XRES 5
#define YRES 8
#define CHARS 8
#define BARS ( BAR_L | BAR_R | BAR_U | BAR_D | BAR_H2 )

static LCD Lcd;


static char *PPdev=NULL;
static int   PPfd=-1;

static char Txt[8][40];
static BAR  Bar[8][40];
static int  GPO=0;

static int nSegment=1;
static SEGMENT Segment[128] = {{ len1:0, len2:0, type:255, used:0, ascii:32 }};

static void M5_command (unsigned int cmd, int delay)
{
  unsigned char data;
  struct ppdev_frob_struct frob;
    
  // put data on DB1..DB8
  data=cmd&0xff;
  ioctl(PPfd, PPWDATA, &data);
    
  // set I/OC1 (Select inverted)
  // set I/OC2 (AutoFeed inverted)
  frob.mask=PARPORT_CONTROL_SELECT | PARPORT_CONTROL_AUTOFD;
  frob.val=0;
  if (!(cmd & 0x200)) {
    frob.val|=PARPORT_CONTROL_SELECT;
  }
  if (!(cmd & 0x100)) {
    frob.val|=PARPORT_CONTROL_AUTOFD;
  }
  ioctl (PPfd, PPFCONTROL, &frob);

  // Control data setup time
  ndelay(200);

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usr/lib
etc
etc/init.d
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r (col=0; col<Lcd.cols; col++) {
      Txt[row][col]='\t';
      Bar[row][col].len1=-1;
      Bar[row][col].len2=-1;
      Bar[row][col].type=0;
      Bar[row][col].segment=-1;
    }
  }
  GPO=0;
  M5_setGPO (GPO);           // All GPO's off
  M5_command (0x0001, 1250); // clear display
  return 0;
}

int M5_init (LCD *Self)
{
  int rows=-1, cols=-1, gpos=-1;
  char *s, *e;
  
  if (PPdev) {
    free (PPdev);
    PPdev=NULL;
  }
  
  s=cfg_get ("Port");
  if (s==NULL || *s=='\0') {
    error ("M50530: no 'Port' entry in %s", cfg_file());
    return -1;
  }
  PPdev=strdup(s);
  
  s=cfg_get("Size");
  if (s==NULL || *s=='\0') {
    error ("M50530: no 'Size' entry in %s", cfg_file());
    return -1;
  }
  if (sscanf(s,"%dx%d",&cols,&rows)!=2 || rows<1 || cols<1) {
    error ("M50530: bad size '%s'",s);
    return -1;
  }

  s=cfg_get ("GPOs");
  if (s==NULL) {
    gpos=0;
  }
  else if ((gpos=strtol(s, &e, 0))==0 || *e!='\0' || gpos<0 || gpos>8) {
    error ("M50530: bad GPOs '%s' in %s", s, cfg_file());
    return -1;
  }    
  
  Self->rows=rows;
  Self->cols=cols;
  Self->gpos=gpos;
  Lcd=*Self;
  
  udelay_init();

  if (M5_open()!=0)
    return -1;
  
  M5_clear();
  
  return 0;
}

void M5_goto (int row, int col)
{
  int pos;

  pos=row*48+col;
  if (row>3) pos-=168;
  M5_command (0x300|pos, 20);
}

int M5_put (int row, int col, char *text)
{
  char *p=&Txt[row][col];
  char *t=text;
  
  while (*t && col++<=Lcd.cols) {
    *p++=*t++;
  }
  return 0;
}

int M5_bar (int type, int row, int col, int max, int len1, int len2)
{
  int rev=0;
  
  if (len1<1) len1=1;
  else if (len1>max) len1=max;
  
  if (len2<1) len2=1;
  else if (len2>max) len2=max;
  
  switch (type) {
  case BAR_L:
    len1=max-len1;
    len2=max-len2;
    rev=1;
    
  case BAR_R:
    while (max>0 && col<=Lcd.cols) {
      Bar[row][col].type=type;
      Bar[row][col].segment=-1;
      if (len1>=XRES) {
	Bar[row][col].len1=rev?0:XRES;
	len1-=XRES;
      } else {
	Bar[row][col].len1=rev?XRES-len1:len1;
	len1=0;
      }
      if (len2>=XRES) {
	Bar[row][col].len2=rev?0:XRES;
	len2-=XRES;
      } else {
	Bar[row][col].len2=rev?XRES-len2:len2;
	len2=0;
      }
      max-=XRES;
      col++;
    }
    break;

  case BAR_U:
    len1=max-len1;
    len2=max-len2;
    rev=1;
    
  case BAR_D:
    while (max>0 && row<=Lcd.rows) {
      Bar[row][col].type=type;
      Bar[row][col].segment=-1;
      if (len1>=YRES) {
	Bar[row][col].len1=rev?0:YRES;
	len1-=YRES;
      } else {
	Bar[row][col].len1=rev?YRES-len1:len1;
	len1=0;
      }
      if (len2>=YRES) {
	Bar[row][col].len2=rev?0:YRES;
	len2-=YRES;
      } else {
	Bar[row][col].len2=rev?YRES-len2:len2;
	len2=0;
      }
      max-=YRES;
      row++;
    }
    break;

  }
  return 0;
}

int M5_gpo (int num, int val)
{
  if (num>=Lcd.gpos) 
    return -1;

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

int M5_flush (void)
{
  unsigned char buffer[256];
  unsigned char *p;
  int s, row, col;
  
  M5_process_bars();
  M5_compact_bars();
  M5_define_chars();
  
  for (s=0; s<nSegment; s++) {
    Segment[s].used=0;
  }

  for (row=0; row<Lcd.rows; row++) {
    for (col=0; col<Lcd.cols; col++) {
      s=Bar[row][col].segment;
      if (s!=-1) {
	Segment[s].used=1;
	Txt[row][col]=Segment[s].ascii;
      }
    }
    for (col=0; col<Lcd.cols; col++) {
      if (Txt[row][col]=='\t') continue;
      M5_goto (row, col);
      for (p=buffer; col<Lcd.cols; col++, p++) {
	if (Txt[row][col]=='\t') break;
	*p=Txt[row][col];
      }
      M5_write (buffer, p-buffer);
    }
  }

  M5_setGPO(GPO);

  return 0;
}

int M5_quit (void)
{
  debug ("closing ppdev %s", PPdev);
  if (ioctl(PPfd, PPRELEASE)) {
    error ("ioctl(%s, PPRELEASE) failed: %s", PPdev, strerror(errno));
  }
  if (close(PPfd)==-1) {
    error ("close(%s) failed: %s", PPdev, strerror(errno));
    return -1;
  }
  return 0;
}

LCD M50530[] = {
  { "M50530",0,0,XRES,YRES,BARS,0,M5_init,M5_clear,M5_put,M5_bar,M5_gpo,M5_flush,M5_quit },
  { NULL }
};