From 7cc74543ed3cf39c641898c1c310535022e3affd Mon Sep 17 00:00:00 2001
From: reinelt <>
Date: Tue, 11 Sep 2001 05:31:37 +0000
Subject: [lcd4linux @ 2001-09-11 05:31:37 by reinelt] M50530 driver

---
 M50530.c | 669 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 669 insertions(+)
 create mode 100644 M50530.c

(limited to 'M50530.c')

diff --git a/M50530.c b/M50530.c
new file mode 100644
index 0000000..e7f39cc
--- /dev/null
+++ b/M50530.c
@@ -0,0 +1,669 @@
+/* $Id: M50530.c,v 1.1 2001/09/11 05:31:37 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 1.1  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>
+
+#ifdef HAVE_SYS_IO_H
+#include <sys/io.h>
+#define WITH_OUTB
+#else
+#ifdef HAVE_ASM_IO_H
+#include <asm/io.h>
+#define WITH_OUTB
+#endif
+#endif
+
+#if defined (HAVE_LINUX_PARPORT_H) && defined (HAVE_LINUX_PPDEV_H)
+#define WITH_PPDEV
+#include <linux/parport.h>
+#include <linux/ppdev.h>
+#endif
+
+
+#if !defined(WITH_OUTB) && !defined(WITH_PPDEV)
+#error neither outb() nor ppdev() possible
+#error cannot compile M50530 driver
+#endif
+
+#include "debug.h"
+#include "cfg.h"
+#include "display.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 )
+
+typedef struct {
+  int len1;
+  int len2;
+  int type;
+  int segment;
+} BAR;
+
+typedef struct {
+  int len1;
+  int len2;
+  int type;
+  int used;
+  int ascii;
+} SEGMENT;
+
+static LCD Lcd;
+
+
+static unsigned short Port=0;
+
+static char *PPdev=NULL;
+
+#ifdef WITH_PPDEV
+static int   PPfd=-1;
+#endif
+
+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)
+{
+#ifdef WITH_PPDEV
+  if (PPdev) {
+
+    unsigned char data;
+    struct ppdev_frob_struct frob;
+    
+    // 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);
+
+    // rise EX (Strobe, inverted)
+    frob.mask=PARPORT_CONTROL_STROBE;
+    frob.val=0;
+    ioctl (PPfd, PPFCONTROL, &frob);
+    
+    // put data on DB1..DB8
+    data=cmd&0xff;
+    ioctl(PPfd, PPWDATA, &data);
+    
+    // lower EX (Strobe, inverted)
+    frob.mask=PARPORT_CONTROL_STROBE;
+    frob.val=PARPORT_CONTROL_STROBE;
+    ioctl (PPfd, PPFCONTROL, &frob);
+    
+    // wait
+    udelay(delay);
+
+  } else
+
+#endif
+
+    {
+      // Fixme: not implemented
+    }
+}
+
+static void M5_write (unsigned char *string, int len)
+{
+  unsigned int cmd;
+
+  while (len--) {
+    cmd=*string++;
+    M5_command (0x100|cmd, 20);
+  }
+}
+
+static void M5_setGPO (int bits)
+{
+  if (Lcd.gpos>0) {
+
+#ifdef WITH_PPDEV
+
+    if (PPdev) {
+      
+      struct ppdev_frob_struct frob;
+  
+      // put data on DB1..DB8
+      ioctl(PPfd, PPWDATA, &bits);
+
+      // toggle INIT
+      frob.mask=PARPORT_CONTROL_INIT;
+      frob.val=PARPORT_CONTROL_INIT; // rise
+      ioctl (PPfd, PPFCONTROL, &frob);
+      udelay(1);
+      frob.val=0; // lower
+      ioctl (PPfd, PPFCONTROL, &frob);
+
+    } else
+      
+#endif
+      
+      {
+	// Fixme: not implemented
+      }
+  }
+}
+
+static int M5_open (void)
+{
+#ifdef WITH_PPDEV
+
+  if (PPdev) {
+    debug ("using ppdev %s", PPdev);
+    PPfd=open(PPdev, O_RDWR);
+    if (PPfd==-1) {
+      error ("open(%s) failed: %s", PPdev, strerror(errno));
+      return -1;
+    }
+
+#if 0
+    if (ioctl(PPfd, PPEXCL)) {
+      debug ("ioctl(%s, PPEXCL) failed: %s", PPdev, strerror(errno));
+    } else {
+      debug ("ioctl(%s, PPEXCL) succeded.");
+    }
+#endif
+
+    if (ioctl(PPfd, PPCLAIM)) {
+      error ("ioctl(%s, PPCLAIM) failed: %d %s", PPdev, errno, strerror(errno));
+      return -1;
+    }
+  } else
+
+#endif
+
+    {
+      debug ("using raw port 0x%x", Port);
+      if (ioperm(Port, 3, 1)!=0) {
+	error ("M50530: ioperm(0x%x) failed: %s", Port, strerror(errno));
+	return -1;
+      }
+    }
+
+  M5_command (0x00FA, 20); // set function mode
+  M5_command (0x0020, 20); // set display mode
+  M5_command (0x0050, 20); // set entry mode
+  M5_command (0x0030, 20); // set display mode
+  M5_command (0x0001, 1250); // clear display
+
+  return 0;
+}
+
+static void M5_process_bars (void)
+{
+  int row, col;
+  int i, j;
+  
+  for (i=1; i<nSegment && Segment[i].used; i++);
+  for (j=i+1; j<nSegment; j++) {
+    if (Segment[j].used)
+      Segment[i++]=Segment[j];
+  }
+  nSegment=i;
+  
+  for (row=0; row<Lcd.rows; row++) {
+    for (col=0; col<Lcd.cols; col++) {
+      if (Bar[row][col].type==0) continue;
+      for (i=0; i<nSegment; i++) {
+	if (Segment[i].type & Bar[row][col].type &&
+	    Segment[i].len1== Bar[row][col].len1 &&
+	    Segment[i].len2== Bar[row][col].len2) break;
+      }
+      if (i==nSegment) {
+	nSegment++;
+	Segment[i].len1=Bar[row][col].len1;
+	Segment[i].len2=Bar[row][col].len2;
+	Segment[i].type=Bar[row][col].type;
+	Segment[i].used=0;
+	Segment[i].ascii=-1;
+      }
+      Bar[row][col].segment=i;
+    }
+  }
+}
+
+static int M5_segment_diff (int i, int j)
+{
+  int RES;
+  int i1, i2, j1, j2;
+  
+  if (i==j) return 65535;
+  if (!(Segment[i].type & Segment[j].type)) return 65535;
+  if (Segment[i].len1==0 && Segment[j].len1!=0) return 65535;
+  if (Segment[i].len2==0 && Segment[j].len2!=0) return 65535;
+  RES=Segment[i].type & BAR_H ? XRES:YRES;
+  if (Segment[i].len1>=RES && Segment[j].len1<RES) return 65535;
+  if (Segment[i].len2>=RES && Segment[j].len2<RES) return 65535;
+  if (Segment[i].len1==Segment[i].len2 && Segment[j].len1!=Segment[j].len2) return 65535;
+
+  i1=Segment[i].len1; if (i1>RES) i1=RES;
+  i2=Segment[i].len2; if (i2>RES) i2=RES;
+  j1=Segment[j].len1; if (j1>RES) i1=RES;
+  j2=Segment[j].len2; if (j2>RES) i2=RES;
+  
+  return (i1-i2)*(i1-i2)+(j1-j2)*(j1-j2);
+}
+
+static void M5_compact_bars (void)
+{
+  int i, j, r, c, min;
+  int pack_i, pack_j;
+  int pass1=1;
+  int deviation[nSegment][nSegment];
+  
+  if (nSegment>CHARS+1) {
+
+    for (i=1; i<nSegment; i++) {
+      for (j=0; j<nSegment; j++) {
+	deviation[i][j]=M5_segment_diff(i,j);
+      }
+    }
+    
+    while (nSegment>CHARS+1) {
+      min=65535;
+      pack_i=-1;
+      pack_j=-1;
+      for (i=2; i<nSegment; i++) {
+	if (pass1 && Segment[i].used) continue;
+	for (j=0; j<nSegment; j++) {
+	  if (deviation[i][j]<min) {
+	    min=deviation[i][j];
+	    pack_i=i;
+	    pack_j=j;
+	  }
+	}
+      }
+      if (pack_i==-1) {
+	if (pass1) {
+	  pass1=0;
+	  continue;
+	} else {
+	  error ("M50530: unable to compact bar characters");
+	  nSegment=CHARS;
+	  break;
+	}
+      } 
+      
+      nSegment--;
+      Segment[pack_i]=Segment[nSegment];
+      
+      for (i=0; i<nSegment; i++) {
+	deviation[pack_i][i]=deviation[nSegment][i];
+	deviation[i][pack_i]=deviation[i][nSegment];
+      }
+      
+      for (r=0; r<Lcd.rows; r++) {
+	for (c=0; c<Lcd.cols; c++) {
+	  if (Bar[r][c].segment==pack_i)
+	    Bar[r][c].segment=pack_j;
+	  if (Bar[r][c].segment==nSegment)
+	    Bar[r][c].segment=pack_i;
+	}
+      }
+    }
+  }
+}
+
+static void M5_define_chars (void)
+{
+  int c, i, j;
+  char buffer[8];
+
+  for (i=1; i<nSegment; i++) {
+    if (Segment[i].used) continue;
+    if (Segment[i].ascii!=-1) continue;
+    for (c=0; c<CHARS; c++) {
+      for (j=1; j<nSegment; j++) {
+	if (Segment[j].ascii==248+c) break;
+      }
+      if (j==nSegment) break;
+    }
+    Segment[i].ascii=248+c;
+    switch (Segment[i].type) {
+    case BAR_L:
+      for (j=0; j<4; j++) {
+	char Pixel[] = { 0, 1, 3, 7, 15, 31 };
+	buffer[j]=Pixel[Segment[i].len1];
+	buffer[j+4]=Pixel[Segment[i].len2];
+      }
+      break;
+    case BAR_R:
+      for (j=0; j<4; j++) {
+	char Pixel[] = { 0, 16, 24, 28, 30, 31 };
+	buffer[j]=Pixel[Segment[i].len1];
+	buffer[j+4]=Pixel[Segment[i].len2];
+      }
+      break;
+    case BAR_U:
+      for (j=0; j<Segment[i].len1; j++) {
+	buffer[7-j]=31;
+      }
+      for (; j<YRES; j++) {
+	buffer[7-j]=0;
+      }
+      break;
+    case BAR_D:
+      for (j=0; j<Segment[i].len1; j++) {
+	buffer[j]=31;
+      }
+      for (; j<YRES; j++) {
+	buffer[j]=0;
+      }
+      break;
+    }
+    M5_command (0x300+192+8*c, 20);
+    M5_write (buffer, 8);
+  }
+}
+
+int M5_clear (void)
+{
+  int row, col;
+
+  for (row=0; row<Lcd.rows; row++) {
+    for (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;
+  
+  s=cfg_get ("Port");
+  if (s==NULL || *s=='\0') {
+    error ("M50530: no 'Port' entry in %s", cfg_file());
+    return -1;
+  }
+  PPdev=NULL;
+  if ((Port=strtol(s, &e, 0))==0 || *e!='\0') {
+#ifdef WITH_PPDEV
+    Port=0;
+    PPdev=s;
+#else
+    error ("M50530: bad port '%s' in %s", s, cfg_file());
+    return -1;
+#endif
+  }
+  
+#ifdef USE_OLD_UDELAY
+  s=cfg_get ("Delay");
+  if (s==NULL || *s=='\0') {
+    error ("M50530: no 'Delay' entry in %s", cfg_file());
+    return -1;
+  }
+  if ((loops_per_usec=strtol(s, &e, 0))==0 || *e!='\0') {
+    error ("M50530: bad delay '%s' in %s", s, cfg_file());
+    return -1;
+  }    
+#endif
+  
+  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;
+  
+#ifndef USE_OLD_UDELAY
+  udelay_init();
+#endif
+
+  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)
+{
+#ifdef WITH_PPDEV
+  if (PPdev) {
+    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;
+    }
+  } else 
+#endif    
+   {
+    debug ("closing raw port 0x%x", Port);
+    if (ioperm(Port, 3, 0)!=0) {
+      error ("M50530: ioperm(0x%x) failed: %s", Port, 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 }
+};
-- 
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