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Message-ID: <653402b90609111654vcfdefdckf160a20ecd6f6a65@mail.gmail.com>
Date: Tue, 12 Sep 2006 01:54:16 +0200
From: "Miguel Ojeda" <maxextreme@...il.com>
To: akpm@...l.org
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] display: Driver ks0108 and cfag12864b
Miguel Ojeda Sandonis
Adds support for additional "display" devices, like small LCD screens.
Adds support for the ks0108 LCD Controller.
Adds support for the cfag12864b LCD.
Signed-off-by: Miguel Ojeda Sandonis <maxextreme@...il.com>
---
diff -uprN -X linux-2.6.17.13-vanilla/Documentation/dontdiff
linux-2.6.17.13-vanilla/Documentation/drivers/display/cfag12864b
linux-2.6.17.13/Documentation/drivers/display/cfag12864b
--- linux-2.6.17.13-vanilla/Documentation/drivers/display/cfag12864b
1970-01-01
01:00:00.000000000 +0100
+++ linux-2.6.17.13/Documentation/drivers/display/cfag12864b 2006-09-12
00:10:43.000000000 +0200
@@ -0,0 +1,363 @@
+ ===============================
+ cfag12864b Driver Documentation
+ ===============================
+
+License: GPL
+Author & Maintainer: Miguel Ojeda Sandonis <maxextreme@...il.com>
+Date: 2006-09-10
+
+
+
+--------
+0. INDEX
+--------
+
+ 1. DEVICE INFORMATION
+ 2. WIRING
+ 3. USER-SPACE PROGRAMMING
+ 3.1. ioctl and a 128*64 boolean matrix
+ 3.2. Direct writing
+ 4. USEFUL FILES
+ 4.1. cfag12864b.h
+ 4.2. bmpwriter.h
+
+
+
+---------------------
+1. DEVICE INFORMATION
+---------------------
+
+Manufacturer: Crystalfontz
+Webpage: http://www.crystalfontz.com
+Device Webpage: http://www.crystalfontz.com/products/12864b/
+Type: LCD Display
+Width: 128
+Height: 64
+Colors: 2
+Controller: ks0108
+Controllers: 2
+Pages: 8 each controller
+Addresses: 64 each page
+
+
+If you compiled the device as a module, don't remember to
+update udev to get the new device node at /dev.
+
+
+---------
+2. WIRING
+---------
+
+The cfag12864b LCD Display Series don't have a official wiring.
+
+The common wiring is done to the parallel port:
+
+http://www.skippari.net/lcd/sekalaista/crystalfontz_cfag12864B-TMI-V.png
+
+You can get help at Crystalfontz and LCDInfo forums.
+
+
+
+-------------------------
+3. USER-SPACE PROGRAMMING
+-------------------------
+
+Include a copy of the provided header:
+
+ #include "cfag12864b.h"
+
+Open the device for writing, /dev/cfag12864b0:
+
+ int fd = open("/dev/cfag12864b0",O_WRONLY);
+
+Then use simple ioctl calls to control it:
+
+ ioctl(fdisplay,CFAG12864B_IOCOFF); /* Turn off (don't clear) */
+ ioctl(fdisplay,CFAG12864B_IOCON); /* Turn on */
+ ioctl(fdisplay,CFAG12864B_IOCCLEAR); /* Clear the display */
+
+For writing to the display, you have two options:
+
+
+3.1. ioctl & 128*64 boolean matrix
+-------------------------------------------------------
+
+This method is easier, but you have to update the entire display
+each time you want to change it.
+
+Note:
+
+ CFAG12864B_FORMATSIZE ==
+ CFAG12864B_WIDTH * CFAG12864B_HEIGHT ==
+ 128 * 64
+
+Declare the matrix and other one:
+
+ unsigned char MyDrawing[CFAG12864B_WIDTH][CFAG12864B_HEIGHT];
+
+ unsigned char Buffer[CFAG12864B_FORMATSIZE];
+
+Copy the 2d matrix to the buffer , like:
+
+ for(i=0;i<CFAG12864B_WIDTH;++i)
+ for(j=0;j<CFAG12864B_HEIGHT;++j)
+ Buffer[i+j*CFAG12864B_WIDTH]=MyDrawing[i][j];
+
+Call the ioctl:
+
+ ioctl(fdisplay,CFAG12864B_IOCFORMAT,Buffer);
+
+Voila! Your drawing should appear on the screen.
+
+
+
+3.2. Direct writing
+-------------------
+
+This methods allows you to change each byte of the device,
+so you can achieve a higher update rate.
+
+The device size is 1024 == CFAG12864B_SIZE.
+
+You can write and seek the device. The first 512 bytes write to
+the first k0108 controller (left display half) and the last 512 bytes
+write to the second ks0108 controller (right display half).
+
+Each controller is divided into 8 pages. Each page has 64 bytes.
+
+ Controller 0 Controller 1
+ _________________________
+Page 0 |____________|____________|
+Page 1 |____________|____________|
+Page 2 |____________|____________|
+Page 3 |____________|____________|
+Page 4 |____________|____________|
+Page 5 |____________|____________|
+Page 6 |____________|____________|
+Page 7 |____________|____________|
+ <--- 64 --->
+
+You will understand how the device work executing some commands:
+
+ # echo -n A > /dev/cfag12864b0
+ # echo -n a > /dev/cfag12864b0
+ # echo AAAAAA > /dev/cfag12864b0
+ # echo 000000 > /dev/cfag12864b0
+ # echo Hello world! > /dev/cfag12864b0
+ # echo Hello world! Hello world! > /dev/cfag12864b0
+
+After you understand it, code your functions to change specific bytes.
+
+Use write() and lseek() system calls, like:
+
+ lseek(fdisplay,ipage*CFAG12864B_HEIGHT,SEEK_SET);
+ lseek(fdisplay,icontroller*CFAG12864B_SIZE/2,SEEK_SET);
+
+ write(fdisplay,bufpage,CFAG12864B_HEIGHT);
+ write(fdisplay,bufcontroller,CFAG12864B_SIZE/2);
+ write(fdisplay,bufdisplay,CFAG12864B_SIZE);
+
+
+---------------
+4. USEFUL FILES
+---------------
+
+
+4.1 cfag12864b.h
+----------------
+
+You can use a copy of this header in your user-space programs.
+
+---
+/*
+ * Filename: cfag12864b.h
+ * Version: 0.1.0
+ * Description: cfag12864b LCD Display Driver Header for user-space apps
+ * License: GPL
+ *
+ * Author: Miguel Ojeda Sandonis <maxextreme@...il.com>
+ * Date: 2006-09-10
+ */
+
+#ifndef _CFAG12864B_H_
+#define _CFAG12864B_H_
+
+#include <sys/ioctl.h>
+
+#define CFAG12864B_WIDTH 128
+#define CFAG12864B_HEIGHT 64
+#define CFAG12864B_FORMATSIZE CFAG12864B_WIDTH*CFAG12864B_HEIGHT
+#define CFAG12864B_SIZE 1024
+
+#define CFAG12864B_IOC_MAGIC 0xFF
+
+#define CFAG12864B_IOCOFF _IO(CFAG12864B_IOC_MAGIC,0)
+#define CFAG12864B_IOCON _IO(CFAG12864B_IOC_MAGIC,1)
+#define CFAG12864B_IOCCLEAR _IO(CFAG12864B_IOC_MAGIC,2)
+#define CFAG12864B_IOCFORMAT _IOW(CFAG12864B_IOC_MAGIC,3,void *)
+
+#endif // _CFAG12864B_H_
+---
+
+
+
+4.2 Example BMP writer
+----------------------
+
+You can take ideas from this code. It reads a .bmp file,
+convert it to a boolean [128*64] buffer and then use
+ioctl to display it on the screen.
+
+---
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include "cfag12864b.h"
+
+#define BMP_SIZE 1024
+
+union dword
+{
+ unsigned int u32;
+ unsigned char u8[4];
+};
+
+#define Bit(n) ((unsigned char)(1<<(n)))
+
+void BMP2Format(
+ unsigned char _Src[BMP_SIZE],
+ unsigned char _Dest[CFAG12864B_FORMATSIZE])
+{
+ const unsigned int Width = CFAG12864B_WIDTH;
+ const unsigned int Height = CFAG12864B_HEIGHT;
+ const unsigned int Bits = 8;
+
+ unsigned int Y,X,Bit;
+
+ for(Y=0; Y<Height; ++Y)
+ for(X=0; X<Width/Bits; ++X)
+ for(Bit=0; Bit<Bits; ++Bit)
+ _Dest[X*Bits+Bit+(Height-Y-1)*Width] =
+ _Src[Y*Width/Bits+X]&Bit(Bits-Bit-1)?0:1;
+}
+
+int main(int argc, char * argv[])
+{
+ const unsigned int Width = CFAG12864B_WIDTH;
+ const unsigned int Height = CFAG12864B_HEIGHT;
+ const unsigned int Size = CFAG12864B_SIZE;
+ const unsigned int BPP = 1;
+ const unsigned int HeaderSize = 0x3E;
+ const unsigned int BMPSize = BMP_SIZE;
+
+ unsigned char c;
+ unsigned int i,j;
+ union dword n;
+
+ unsigned char Buffer_BMP[BMP_SIZE];
+ unsigned char Buffer_Matrix[CFAG12864B_FORMATSIZE];
+
+ int fdisplay;
+ FILE * fbmp;
+
+ // Check args
+ if(argc!=3) {
+ printf("%s: Bad number of arguments. Expected 3\n",
+ argv[0]);
+ return -1;
+ }
+
+ // Open file
+ fbmp = fopen(argv[2],"rb");
+ if(fbmp==NULL) {
+ printf("%s: Can't open %s\n",argv[0], argv[2]);
+ return -2;
+ }
+
+ // Check file size
+ fseek(fbmp,0,SEEK_END);
+ i=ftell(fbmp);
+ if(i!=HeaderSize+Size) {
+ printf("%s: Bad file size. %i instead of %i\n",
+ argv[0], i, HeaderSize+Size);
+ fclose(fbmp);
+ return -3;
+ }
+
+ // Check both magic BMP bytes
+ fseek(fbmp,0,SEEK_SET);
+ c = fgetc(fbmp);
+ if(c!='B') {
+ printf("%s: Bad first magic byte. '%c' instead of 'B'\n",
+ argv[0], c);
+ fclose(fbmp);
+ return -4;
+ }
+ c = fgetc(fbmp);
+ if(c!='M') {
+ printf("%s: Bad second magic byte. '%c' instead of 'M'\n",
+ argv[0], c);
+ fclose(fbmp);
+ return -5;
+ }
+
+ // Check this is a 128x64 1-bpp BMP file
+ fseek(fbmp,0x12,SEEK_SET);
+ for(i=0; i<4; ++i)
+ n.u8[i] = fgetc(fbmp);
+ if(n.u32!=Width) {
+ printf("%s: Bad width. %i instead of %i\n",
+ argv[0], n.u32, Width);
+ fclose(fbmp);
+ return -6;
+ }
+ for(i=0; i<4; ++i)
+ n.u8[i] = fgetc(fbmp);
+ if(n.u32!=Height) {
+ printf("%s: Bad width. %i instead of %i\n",
+ argv[0], n.u32, Height);
+ fclose(fbmp);
+ return -7;
+ }
+ fseek(fbmp,0x1C,SEEK_SET);
+ c = fgetc(fbmp);
+ if(c!=BPP) {
+ printf("%s: Bad bpp. %i instead of %i\n",
+ argv[0], c, BPP);
+ fclose(fbmp);
+ return -8;
+ }
+
+ // Get bitmap data
+ fseek(fbmp,0x3E,SEEK_SET);
+ for(i=0; i<BMPSize; ++i)
+ Buffer_BMP[i]=fgetc(fbmp);
+ fclose(fbmp);
+
+ // Transform BMP data to 2D matrix
+ BMP2Format(Buffer_BMP,Buffer_Matrix);
+
+ // Open file
+ fdisplay = open(argv[1],O_WRONLY);
+ if(fdisplay < 0) {
+ printf("%s: Can't open %s\n", argv[0], argv[1]);
+ return -9;
+ }
+
+ // Send matrix
+ ioctl(fdisplay,CFAG12864B_IOCFORMAT,Buffer_Matrix);
+
+ // Close file
+ close(fdisplay);
+
+ return 0;
+}
+---
+
+
+EOF
diff -uprN -X linux-2.6.17.13-vanilla/Documentation/dontdiff
linux-2.6.17.13-vanilla/Documentation/drivers/display/display
linux-2.6.17.13/Documentation/drivers/display/display
--- linux-2.6.17.13-vanilla/Documentation/drivers/display/display
1970-01-01
01:00:00.000000000 +0100
+++ linux-2.6.17.13/Documentation/drivers/display/display 2006-09-12
00:24:39.000000000 +0200
@@ -0,0 +1,37 @@
+ =============================
+ Display Drivers Documentation
+ =============================
+
+License: GPL
+Author & Maintainer: Miguel Ojeda Sandonis <maxextreme@...il.com>
+Date: 2006-09-10
+
+--------
+0. INDEX
+--------
+
+ 1. NEW DISPLAY DRIVERS
+ 2. GENERAL TIPS
+
+
+
+----------------------
+1. NEW DISPLAY DRIVERS
+----------------------
+
+Feel free to send me new display drivers. I will try to do my best.
+
+If you don't get any answer, send your patch directly to the linux-kernel ml.
+
+
+
+---------------
+2. GENERAL TIPS
+---------------
+
+- Divide your driver into the controller driver, like ks0108,
+ and the specific LCD display series driver, like cfag12864b.
+
+- Claim for your IO ports in the controller driver.
+
+EOF
diff -uprN -X linux-2.6.17.13-vanilla/Documentation/dontdiff
linux-2.6.17.13-vanilla/Documentation/ioctl-number.txt
linux-2.6.17.13/Documentation/ioctl-number.txt
--- linux-2.6.17.13-vanilla/Documentation/ioctl-number.txt 2006-09-09
05:23:25.000000000 +0200
+++ linux-2.6.17.13/Documentation/ioctl-number.txt 2006-09-12
00:36:48.000000000 +0200
@@ -190,3 +190,5 @@ Code Seq# Include File Comments
<mailto:aherrman@...ibm.com>
0xF3 00-3F video/sisfb.h sisfb (in development)
<mailto:thomas@...ischhofer.net>
+0xFF 00-1F cfag12864b LCD Display linux/cfag12864b.h
+ <mailto:maxextreme@...il.com>
diff -uprN -X linux-2.6.17.13-vanilla/Documentation/dontdiff
linux-2.6.17.13-vanilla/CREDITS linux-2.6.17.13/CREDITS
--- linux-2.6.17.13-vanilla/CREDITS 2006-09-09 05:23:25.000000000 +0200
+++ linux-2.6.17.13/CREDITS 2006-09-12 00:16:06.000000000 +0200
@@ -2534,6 +2534,14 @@ S: Subiaco, 6008
S: Perth, Western Australia
S: Australia
+N: Miguel Ojeda Sandonis
+E: maxextreme@...il.com
+D: Author: LCD Display Drivers (ks0108, cfag12864b)
+D: Maintainer: LCD Display Drivers Tree (drivers/display/*)
+S: C/ Mieses 20, 9-B
+S: Valladolid 47009
+S: Spain
+
N: Greg Page
E: gpage@...ereign.org
D: IPX development and support
-
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