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drv_HD44780.c
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/* $Id$
* $URL$
*
* new style driver for HD44780-based displays
*
* Copyright (C) 2003 Michael Reinelt <[email protected]>
* Copyright (C) 2004 The LCD4Linux Team <[email protected]>
*
* Support for I2C bus
* Copyright (C) 2005 Luis Correia <[email protected]>
*
* Modification for 4-Bit mode
* Copyright (C) 2003 Martin Hejl ([email protected])
*
* Modification for 2nd controller support
* Copyright (C) 2003 Jesse Brook Kovach <[email protected]>
*
* 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.
*
*/
/*
*
* exported fuctions:
*
* struct DRIVER drv_HD44780
*
*/
#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 <sys/ioctl.h>
#include "debug.h"
#include "cfg.h"
#include "udelay.h"
#include "qprintf.h"
#include "timer.h"
#include "plugin.h"
#include "widget.h"
#include "widget_text.h"
#include "widget_icon.h"
#include "widget_bar.h"
#include "widget_keypad.h"
#include "drv.h"
#include "drv_generic_text.h"
#include "drv_generic_gpio.h"
#ifdef WITH_PARPORT
#include "drv_generic_parport.h"
#include "drv_generic_keypad.h"
#include "widget_keypad.h"
#endif
#ifdef WITH_I2C
#include "drv_generic_i2c.h"
#endif
static char Name[] = "HD44780";
static int Bus;
static int Model;
static int Capabilities;
/* Timings */
#ifdef WITH_PARPORT
static int T_CY, T_PW, T_AS, T_AH;
#endif
static int T_INIT1, T_INIT2, T_EXEC, T_WRCG, T_CLEAR, T_HOME, T_ONOFF;
#ifdef WITH_PARPORT
static int T_POWER, T_GPO_ST, T_GPO_PW;
#endif
static int Bits = 0;
static int numControllers = 0;
static int allControllers = 0;
static int currController = 0;
/* size of every single controller */
static int CROWS[4];
static int CCOLS[4];
static unsigned char SIGNAL_RW;
static unsigned char SIGNAL_RS;
static unsigned char SIGNAL_ENABLE;
static unsigned char SIGNAL_ENABLE2;
static unsigned char SIGNAL_ENABLE3;
static unsigned char SIGNAL_ENABLE4;
static unsigned char SIGNAL_GPO;
#ifdef WITH_PARPORT
static unsigned char SIGNAL_GPI;
static unsigned char SIGNAL_BACKLIGHT;
static unsigned char SIGNAL_POWER;
#endif
/* maximum time to wait for the busy-flag (in usec) */
#define MAX_BUSYFLAG_WAIT 10000
/* maximum busy flag errors before falling back to busy-waiting */
#define MAX_BUSYFLAG_ERRORS 20
/* flag for busy-waiting vs. busy flag checking */
#ifdef WITH_PARPORT
static int UseBusy = 0;
#endif
/* which data bits should have their logic inverted */
static int invert_data_bits = 0;
/* buffer holding the GPIO state */
#ifdef WITH_PARPORT
static unsigned char GPO = 0;
#endif
typedef struct {
int type;
char *name;
int capabilities;
} MODEL;
#define CAP_PARPORT (1<<0)
#define CAP_I2C (1<<1)
#define CAP_GPO (1<<2)
#define CAP_BACKLIGHT (1<<3)
#define CAP_BRIGHTNESS (1<<4)
#define CAP_BUSY4BIT (1<<5)
#define CAP_HD66712 (1<<6)
#define CAP_LCM162 (1<<7)
#define CAP_GPI (1<<8)
#define BUS_PP CAP_PARPORT
#define BUS_I2C CAP_I2C
static MODEL Models[] = {
{ 0x01, "generic", CAP_PARPORT | CAP_I2C | CAP_GPO | CAP_GPI | CAP_BACKLIGHT },
{ 0x02, "Noritake", CAP_PARPORT | CAP_I2C | CAP_GPO | CAP_BRIGHTNESS },
{ 0x03, "Soekris", CAP_PARPORT | CAP_BUSY4BIT },
{ 0x04, "HD66712", CAP_PARPORT | CAP_I2C | CAP_GPO | CAP_BACKLIGHT | CAP_HD66712 },
{ 0x05, "LCM-162", CAP_PARPORT | CAP_LCM162 },
{ 0xff, "Unknown", 0 }
};
/****************************************/
/*** generic functions ***/
/****************************************/
static int (*drv_HD_load)(const char *section);
static void (*drv_HD_command)(const unsigned char controller, const unsigned char cmd, const unsigned long delay);
static void (*drv_HD_data)(const unsigned char controller, const char *string, const int len,
const unsigned long delay);
static void (*drv_HD_stop)(void);
/****************************************/
/*** parport dependant functions ***/
/****************************************/
#ifdef WITH_PARPORT
static void drv_HD_PP_busy(const int controller)
{
static unsigned int errors = 0;
unsigned char enable;
unsigned char data = 0xFF;
unsigned char busymask;
unsigned char ctrlmask;
unsigned int counter;
if (Bits == 8) {
busymask = 0x80;
} else {
/* Since in 4-Bit mode DB0 on the parport is mapped to DB4 on the LCD
* (and consequently, DB3 on the partport is mapped to DB7 on the LCD)
* we need to listen for DB3 on the parport to go low
*/
busymask = 0x08;
}
ctrlmask = 0x08;
while (ctrlmask > 0) {
if (controller & ctrlmask) {
enable = 0;
if (ctrlmask & 0x01)
enable = SIGNAL_ENABLE;
else if (ctrlmask & 0x02)
enable = SIGNAL_ENABLE2;
else if (ctrlmask & 0x04)
enable = SIGNAL_ENABLE3;
else if (ctrlmask & 0x08)
enable = SIGNAL_ENABLE4;
/* set data-lines to input */
drv_generic_parport_direction(1);
if (Bits == 8) {
/* Set RW, clear RS */
drv_generic_parport_control(SIGNAL_RW | SIGNAL_RS, SIGNAL_RW);
} else {
drv_generic_parport_data(SIGNAL_RW ^ invert_data_bits);
}
/* Address set-up time */
ndelay(T_AS);
/* rise ENABLE */
if (Bits == 8) {
drv_generic_parport_control(enable, enable);
} else {
drv_generic_parport_data((SIGNAL_RW | enable) ^ invert_data_bits);
}
counter = 0;
while (1) {
/* read the busy flag */
data = drv_generic_parport_read();
if ((data & busymask) == 0) {
errors = 0;
break;
}
/* make sure we don't wait forever
* - but only check after 5 iterations
* that way, we won't slow down normal mode
* (where we don't need the timeout anyway)
*/
counter++;
if (counter >= 5) {
struct timeval now, end;
if (counter == 5) {
/* determine the time when the timeout has expired */
gettimeofday(&end, NULL);
end.tv_usec += MAX_BUSYFLAG_WAIT;
while (end.tv_usec > 1000000) {
end.tv_usec -= 1000000;
end.tv_sec++;
}
}
/* get the current time */
gettimeofday(&now, NULL);
if (now.tv_sec == end.tv_sec ? now.tv_usec >= end.tv_usec : now.tv_sec >= end.tv_sec) {
error("%s: timeout waiting for busy flag on controller %x (0x%02x)", Name, ctrlmask, data);
if (++errors >= MAX_BUSYFLAG_ERRORS) {
error("%s: too many busy flag failures, turning off busy flag checking.", Name);
UseBusy = 0;
}
break;
}
}
}
/* RS=low, RW=low, EN=low */
if (Bits == 8) {
/* Lower EN */
drv_generic_parport_control(enable, 0);
/* Address hold time */
ndelay(T_AH);
drv_generic_parport_control(SIGNAL_RW | SIGNAL_RS, 0);
} else {
/* Lower EN */
drv_generic_parport_data(SIGNAL_RW ^ invert_data_bits);
ndelay(T_AH);
drv_generic_parport_data(0 ^ invert_data_bits);
}
/* set data-lines to output */
drv_generic_parport_direction(0);
}
ctrlmask >>= 1;
}
}
static void drv_HD_PP_nibble(const unsigned char controller, const unsigned char nibble)
{
unsigned char enable;
/* enable signal: 'controller' is a bitmask */
/* bit n .. send to controller #n */
/* so we can send a byte to more controllers at the same time! */
enable = 0;
if (controller & 0x01)
enable |= SIGNAL_ENABLE;
if (controller & 0x02)
enable |= SIGNAL_ENABLE2;
if (controller & 0x04)
enable |= SIGNAL_ENABLE3;
if (controller & 0x08)
enable |= SIGNAL_ENABLE4;
/* clear ENABLE */
/* put data on DB1..DB4 */
/* nibble already contains RS bit! */
drv_generic_parport_data(nibble ^ invert_data_bits);
/* Address set-up time */
ndelay(T_AS);
/* rise ENABLE */
drv_generic_parport_data((nibble | enable) ^ invert_data_bits);
/* Enable pulse width */
ndelay(T_PW);
/* lower ENABLE */
drv_generic_parport_data(nibble ^ invert_data_bits);
}
static void drv_HD_PP_byte(const unsigned char controller, const unsigned char data, const unsigned char RS)
{
/* send high nibble of the data */
drv_HD_PP_nibble(controller, ((data >> 4) & 0x0f) | RS);
/* Make sure we honour T_CY */
ndelay(T_CY - T_AS - T_PW);
/* send low nibble of the data */
drv_HD_PP_nibble(controller, (data & 0x0f) | RS);
}
static void drv_HD_PP_command(const unsigned char controller, const unsigned char cmd, const unsigned long delay)
{
unsigned char enable;
if (UseBusy)
drv_HD_PP_busy(controller);
if (Bits == 8) {
/* enable signal: 'controller' is a bitmask */
/* bit n .. send to controller #n */
/* so we can send a byte to more controllers at the same time! */
enable = 0;
if (controller & 0x01)
enable |= SIGNAL_ENABLE;
if (controller & 0x02)
enable |= SIGNAL_ENABLE2;
if (controller & 0x04)
enable |= SIGNAL_ENABLE3;
if (controller & 0x08)
enable |= SIGNAL_ENABLE4;
/* put data on DB1..DB8 */
drv_generic_parport_data(cmd ^ invert_data_bits);
/* clear RW and RS */
drv_generic_parport_control(SIGNAL_RW | SIGNAL_RS, 0);
/* Address set-up time */
ndelay(T_AS);
/* send command */
drv_generic_parport_toggle(enable, 1, T_PW);
} else {
drv_HD_PP_byte(controller, cmd, 0);
}
/* wait for command completion */
if (!UseBusy)
udelay(delay);
}
static void drv_HD_PP_data(const unsigned char controller, const char *string, const int len, const unsigned long delay)
{
int l = len;
unsigned char enable;
/* sanity check */
if (len <= 0)
return;
if (Bits == 8) {
/* enable signal: 'controller' is a bitmask */
/* bit n .. send to controller #n */
/* so we can send a byte to more controllers at the same time! */
enable = 0;
if (controller & 0x01)
enable |= SIGNAL_ENABLE;
if (controller & 0x02)
enable |= SIGNAL_ENABLE2;
if (controller & 0x04)
enable |= SIGNAL_ENABLE3;
if (controller & 0x08)
enable |= SIGNAL_ENABLE4;
if (!UseBusy) {
/* clear RW, set RS */
drv_generic_parport_control(SIGNAL_RW | SIGNAL_RS, SIGNAL_RS);
/* Address set-up time */
ndelay(T_AS);
}
while (l--) {
if (UseBusy) {
drv_HD_PP_busy(controller);
/* clear RW, set RS */
drv_generic_parport_control(SIGNAL_RW | SIGNAL_RS, SIGNAL_RS);
/* Address set-up time */
ndelay(T_AS);
}
/* put data on DB1..DB8 */
drv_generic_parport_data((*(string++)) ^ invert_data_bits);
/* send command */
drv_generic_parport_toggle(enable, 1, T_PW);
/* wait for command completion */
if (!UseBusy)
udelay(delay);
}
} else { /* 4 bit mode */
while (l--) {
if (UseBusy)
drv_HD_PP_busy(controller);
/* send data with RS enabled */
drv_HD_PP_byte(controller, *(string++), SIGNAL_RS);
/* wait for command completion */
if (!UseBusy)
udelay(delay);
}
}
}
static int drv_HD_PP_load(const char *section)
{
if (cfg_number(section, "Bits", 8, 4, 8, &Bits) < 0)
return -1;
if (Bits != 4 && Bits != 8) {
error("%s: bad %s.Bits '%d' from %s, should be '4' or '8'", Name, section, Bits, cfg_source());
return -1;
}
/* LCM-162 only supports 8-bit-mode */
if (Capabilities & CAP_LCM162 && Bits != 8) {
error("%s: Model '%s' does not support %d bit mode!", Name, Models[Model].name, Bits);
Bits = 8;
}
info("%s: using %d bit mode", Name, Bits);
if (drv_generic_parport_open(section, Name) != 0) {
error("%s: could not initialize parallel port!", Name);
return -1;
}
/* Soft-Wiring */
if (Capabilities & CAP_LCM162) {
/* the LCM-162 is hardwired */
if ((SIGNAL_RS = drv_generic_parport_hardwire_ctrl("RS", "SLCTIN")) == 0xff)
return -1;
if ((SIGNAL_RW = drv_generic_parport_hardwire_ctrl("RW", "INIT")) == 0xff)
return -1;
if ((SIGNAL_ENABLE = drv_generic_parport_hardwire_ctrl("ENABLE", "AUTOFD")) == 0xff)
return -1;
if ((SIGNAL_ENABLE2 = drv_generic_parport_hardwire_ctrl("ENABLE2", "GND")) == 0xff)
return -1;
if ((SIGNAL_ENABLE3 = drv_generic_parport_hardwire_ctrl("ENABLE3", "GND")) == 0xff)
return -1;
if ((SIGNAL_ENABLE4 = drv_generic_parport_hardwire_ctrl("ENABLE4", "GND")) == 0xff)
return -1;
if ((SIGNAL_BACKLIGHT = drv_generic_parport_hardwire_ctrl("BACKLIGHT", "GND")) == 0xff)
return -1;
if ((SIGNAL_GPO = drv_generic_parport_hardwire_ctrl("GPO", "GND")) == 0xff)
return -1;
if ((SIGNAL_POWER = drv_generic_parport_hardwire_ctrl("POWER", "GND")) == 0xff)
return -1;
} else {
if (Bits == 8) {
if ((SIGNAL_RS = drv_generic_parport_wire_ctrl("RS", "AUTOFD")) == 0xff)
return -1;
if ((SIGNAL_RW = drv_generic_parport_wire_ctrl("RW", "GND")) == 0xff)
return -1;
if ((SIGNAL_ENABLE = drv_generic_parport_wire_ctrl("ENABLE", "STROBE")) == 0xff)
return -1;
if ((SIGNAL_ENABLE2 = drv_generic_parport_wire_ctrl("ENABLE2", "GND")) == 0xff)
return -1;
if ((SIGNAL_ENABLE3 = drv_generic_parport_wire_ctrl("ENABLE3", "GND")) == 0xff)
return -1;
if ((SIGNAL_ENABLE4 = drv_generic_parport_wire_ctrl("ENABLE4", "GND")) == 0xff)
return -1;
} else {
if ((SIGNAL_RS = drv_generic_parport_wire_data("RS", "DB4")) == 0xff)
return -1;
if ((SIGNAL_RW = drv_generic_parport_wire_data("RW", "DB5")) == 0xff)
return -1;
if ((SIGNAL_ENABLE = drv_generic_parport_wire_data("ENABLE", "DB6")) == 0xff)
return -1;
if ((SIGNAL_ENABLE2 = drv_generic_parport_wire_data("ENABLE2", "GND")) == 0xff)
return -1;
if ((SIGNAL_ENABLE3 = drv_generic_parport_wire_data("ENABLE3", "GND")) == 0xff)
return -1;
if ((SIGNAL_ENABLE4 = drv_generic_parport_wire_data("ENABLE4", "GND")) == 0xff)
return -1;
}
/* backlight GPO and power are always control signals */
if ((SIGNAL_BACKLIGHT = drv_generic_parport_wire_ctrl("BACKLIGHT", "GND")) == 0xff)
return -1;
if ((SIGNAL_GPO = drv_generic_parport_wire_ctrl("GPO", "GND")) == 0xff)
return -1;
if ((SIGNAL_GPI = drv_generic_parport_wire_ctrl("GPI", "GND")) == 0xff)
return -1;
if ((SIGNAL_POWER = drv_generic_parport_wire_ctrl("POWER", "GND")) == 0xff)
return -1;
}
/* clear capabilities if corresponding signal is GND */
if (SIGNAL_BACKLIGHT == 0) {
Capabilities &= ~CAP_BACKLIGHT;
}
if (SIGNAL_GPO == 0) {
Capabilities &= ~CAP_GPO;
}
if (SIGNAL_GPI == 0) {
Capabilities &= ~CAP_GPI;
}
/* Timings */
/* low level communication timings [nanoseconds]
* as these values differ from spec to spec,
* we use the worst-case default values, but allow
* modification from the config file.
*/
T_CY = timing(Name, section, "CY", 1000, "ns"); /* Enable cycle time */
T_PW = timing(Name, section, "PW", 450, "ns"); /* Enable pulse width */
T_AS = timing(Name, section, "AS", 140, "ns"); /* Address setup time */
T_AH = timing(Name, section, "AH", 20, "ns"); /* Address hold time */
/* GPO timing */
if (SIGNAL_GPO != 0) {
T_GPO_ST = timing(Name, section, "GPO_ST", 20, "ns"); /* 74HCT573 set-up time */
T_GPO_PW = timing(Name, section, "GPO_PW", 230, "ns"); /* 74HCT573 enable pulse width */
} else {
T_GPO_ST = 0;
T_GPO_PW = 0;
}
/* HD44780 execution timings [microseconds]
* as these values differ from spec to spec,
* we use the worst-case default values, but allow
* modification from the config file.
*/
T_INIT1 = timing(Name, section, "INIT1", 4100, "us"); /* first init sequence: 4.1 msec */
T_INIT2 = timing(Name, section, "INIT2", 100, "us"); /* second init sequence: 100 usec */
T_EXEC = timing(Name, section, "EXEC", 80, "us"); /* normal execution time */
T_WRCG = timing(Name, section, "WRCG", 120, "us"); /* CG RAM Write */
T_CLEAR = timing(Name, section, "CLEAR", 2250, "us"); /* Clear Display */
T_HOME = timing(Name, section, "HOME", 2250, "us"); /* Return Cursor Home */
T_ONOFF = timing(Name, section, "ONOFF", 2250, "us"); /* Display On/Off Control */
/* Power-on delay */
if (SIGNAL_POWER != 0) {
T_POWER = timing(Name, section, "POWER", 500, "ms");
} else {
T_POWER = 0;
}
/* clear all signals */
if (Bits == 8) {
drv_generic_parport_control(SIGNAL_RS | SIGNAL_RW |
SIGNAL_ENABLE | SIGNAL_ENABLE2 | SIGNAL_ENABLE3 | SIGNAL_ENABLE4 |
SIGNAL_BACKLIGHT | SIGNAL_GPO | SIGNAL_POWER, 0);
} else {
drv_generic_parport_control(SIGNAL_BACKLIGHT | SIGNAL_GPO | SIGNAL_POWER, 0);
drv_generic_parport_data(0 ^ invert_data_bits);
}
/* set direction: write */
drv_generic_parport_direction(0);
/* raise power pin */
if (SIGNAL_POWER != 0) {
drv_generic_parport_control(SIGNAL_POWER, SIGNAL_POWER);
udelay(1000 * T_POWER);
}
/* initialize *all* controllers */
if (Bits == 8) {
drv_HD_PP_command(allControllers, 0x30, T_INIT1); /* 8 Bit mode, wait 4.1 ms */
drv_HD_PP_command(allControllers, 0x30, T_INIT2); /* 8 Bit mode, wait 100 us */
drv_HD_PP_command(allControllers, 0x38, T_EXEC); /* 8 Bit mode, 1/16 duty cycle, 5x8 font */
} else {
drv_HD_PP_nibble(allControllers, 0x03);
udelay(T_INIT1); /* 4 Bit mode, wait 4.1 ms */
drv_HD_PP_nibble(allControllers, 0x03);
udelay(T_INIT2); /* 4 Bit mode, wait 100 us */
drv_HD_PP_nibble(allControllers, 0x03);
udelay(T_INIT1); /* 4 Bit mode, wait 4.1 ms */
drv_HD_PP_nibble(allControllers, 0x02);
udelay(T_INIT2); /* 4 Bit mode, wait 100 us */
drv_HD_PP_command(allControllers, 0x28, T_EXEC); /* 4 Bit mode, 1/16 duty cycle, 5x8 font */
}
/* maybe use busy-flag from now on */
/* (we can't use the busy flag during the init sequence) */
cfg_number(section, "UseBusy", 0, 0, 1, &UseBusy);
/* make sure we don't use the busy flag with RW wired to GND */
if (UseBusy && !SIGNAL_RW) {
error("%s: busy-flag checking is impossible with RW wired to GND!", Name);
UseBusy = 0;
}
/* make sure the display supports busy-flag checking in 4-Bit-Mode */
/* at the moment this is inly possible with Martin Hejl's gpio driver, */
/* which allows to use 4 bits as input and 4 bits as output */
if (UseBusy && Bits == 4 && !(Capabilities & CAP_BUSY4BIT)) {
error("%s: Model '%s' does not support busy-flag checking in 4 bit mode", Name, Models[Model].name);
UseBusy = 0;
}
info("%s: %susing busy-flag checking", Name, UseBusy ? "" : "not ");
/* The LCM-162 should really use BusyFlag checking */
if (!UseBusy && (Capabilities & CAP_LCM162)) {
error("%s: Model '%s' should definitely use busy-flag checking!", Name, Models[Model].name);
}
return 0;
}
static void drv_HD_PP_stop(void)
{
/* clear all signals */
if (Bits == 8) {
drv_generic_parport_control(SIGNAL_RS |
SIGNAL_RW | SIGNAL_ENABLE | SIGNAL_ENABLE2 | SIGNAL_ENABLE3 | SIGNAL_ENABLE4 |
SIGNAL_BACKLIGHT | SIGNAL_GPO, 0);
} else {
drv_generic_parport_data(0 ^ invert_data_bits);
drv_generic_parport_control(SIGNAL_BACKLIGHT | SIGNAL_GPO | SIGNAL_POWER, 0);
}
drv_generic_parport_close();
}
#endif
#ifdef WITH_I2C
/****************************************/
/*** i2c dependant functions ***/
/****************************************/
/*
DISCLAIMER!!!!
The following code is WORK IN PROGRESS, since it basicly 'works for us...'
(C) 2005 Paul Kamphuis & Luis Correia
We have removed all of the delays from this code, as the I2C bus is slow enough...
(maximum possible speed is 100KHz only)
*/
static void drv_HD_I2C(unsigned char controller, unsigned char byte, int rs, int rw)
{
unsigned char enable;
unsigned char command = 0; /* this is actually the first data byte on the PCF8574 */
unsigned char data_block[2];
/* enable signal: 'controller' is a bitmask */
/* bit n .. send to controller #n */
/* so we can send a byte to more controllers at the same time! */
enable = 0;
if (controller & 0x01)
enable |= SIGNAL_ENABLE;
if (controller & 0x02)
enable |= SIGNAL_ENABLE2;
if (controller & 0x04)
enable |= SIGNAL_ENABLE3;
if (controller & 0x08)
enable |= SIGNAL_ENABLE4;
/*
The new method Paul Kamphuis has concocted places the 3 needed writes to the I2C device
as a single operation, using the 'i2c_smbus_write_block_data' function.
These actual writes are performed by putting the nibble along with the 'EN' signal.
command = first byte to be written, which contains the nibble (DB0..DB3)
data [0] = second byte to be written, which contains the nibble plus the EN signal
data [1] = third byte to be written, which contains the nibble (DB0..DB3)
Then we write the block as a whole.
The main advantage we see is that we do 2 less IOCTL's from our driver.
*/
if (Bits == 4) {
if (rw)
byte |= SIGNAL_RW;
if (rs)
byte |= SIGNAL_RS;
command = byte;
data_block[0] = byte | enable;
data_block[1] = byte;
} else if (Bits == 8) {
if (rw)
command |= SIGNAL_RW;
if (rs)
command |= SIGNAL_RS;
data_block[0] = byte;
data_block[1] = enable;
}
drv_generic_i2c_command(command, data_block, 2, Bits);
}
static void drv_HD_I2C_byte(const unsigned char controller, const unsigned char data)
{
/* send data with RS enabled */
if (Bits == 4) {
drv_HD_I2C(controller, ((data >> 4) & 0x0f), 1, 0);
drv_HD_I2C(controller, (data & 0x0f), 1, 0);
} else if (Bits == 8) {
drv_HD_I2C(controller, data, 1, 0);
}
}
static void drv_HD_I2C_command(const unsigned char controller, const unsigned char cmd, __attribute__((unused))
const unsigned long delay)
{
/* send command data with RS disabled */
if (Bits == 4) {
drv_HD_I2C(controller, ((cmd >> 4) & 0x0f), 0, 0);
drv_HD_I2C(controller, ((cmd) & 0x0f), 0, 0);
} else if (Bits == 8) {
drv_HD_I2C(controller, cmd, 0, 0);
}
}
static void drv_HD_I2C_data(const unsigned char controller, const char *string, const int len, __attribute__((unused))
const unsigned long delay)
{
int l = len;
/* sanity check */
if (len <= 0)
return;
while (l--) {
drv_HD_I2C_byte(controller, *(string++));
}
}
static int drv_HD_I2C_load(const char *section)
{
if (cfg_number(section, "Bits", 8, 4, 8, &Bits) < 0)
return -1;
info("%s: using %d bit mode", Name, Bits);
if (Bits != 4 && Bits != 8) {
error("%s: bad %s.Bits '%d' from %s, should be '4' or '8'", Name, section, Bits, cfg_source());
return -1;
}
if (drv_generic_i2c_open(section, Name) != 0) {
error("%s: could not initialize i2c attached device!", Name);
return -1;
}
if ((SIGNAL_RS = drv_generic_i2c_wire("RS", "DB4")) == 0xff)
return -1;
if ((SIGNAL_RW = drv_generic_i2c_wire("RW", "DB5")) == 0xff)
return -1;
if ((SIGNAL_ENABLE = drv_generic_i2c_wire("ENABLE", "DB6")) == 0xff)
return -1;
if ((SIGNAL_ENABLE2 = drv_generic_i2c_wire("ENABLE2", "GND")) == 0xff)
return -1;
if ((SIGNAL_GPO = drv_generic_i2c_wire("GPO", "GND")) == 0xff)
return -1;
if (Bits == 4) {
/* initialize display */
drv_HD_I2C(allControllers, 0x02, 0, 0);
udelay(T_INIT1); /* 4 Bit mode, wait 4.1 ms */
drv_HD_I2C(allControllers, 0x03, 0, 0);
udelay(T_INIT2); /* 4 Bit mode, wait 100 us */
drv_HD_I2C(allControllers, 0x03, 0, 0);
udelay(T_INIT1); /* 4 Bit mode, wait 4.1 ms */
drv_HD_I2C(allControllers, 0x02, 0, 0);
udelay(T_INIT2); /* 4 Bit mode, wait 100 us */
drv_HD_I2C_command(allControllers, 0x28, T_EXEC); /* 4 Bit mode, 1/16 duty cycle, 5x8 font */
} else if (Bits == 8) {
drv_HD_I2C(allControllers, 0x30, 0, 0); /* 8 Bit mode, wait 4.1 ms */
udelay(T_INIT1); /* 8 Bit mode, wait 4.1 ms */
drv_HD_I2C(allControllers, 0x30, 0, 0); /* 8 Bit mode, wait 100 us */
udelay(T_INIT2); /* 8 Bit mode, wait 4.1 ms */
drv_HD_I2C_command(allControllers, 0x38, T_EXEC); /* 8 Bit mode, 1/16 duty cycle, 5x8 font */
}
info("%s: I2C initialization done", Name);
return 0;
}
static void drv_HD_I2C_stop(void)
{
/* clear all signals */
drv_generic_i2c_data(0);
/* close port */
drv_generic_i2c_close();
}
/* END OF DISCLAIMER */
#endif /* WITH_I2C */
/****************************************/
/*** display dependant functions ***/
/****************************************/
static void drv_HD_clear(void)
{
drv_HD_command(allControllers, 0x01, T_CLEAR); /* clear *all* displays */
}
static int drv_HD_goto(int row, int col)
{
int pos, controller;
/* handle multiple controllers */
for (pos = 0, controller = 0; controller < numControllers; controller++) {
pos += CROWS[controller];
if (row < pos) {
currController = (1 << controller);
break;
}
row -= CROWS[controller];
}
/* column outside of current display's width */
if (col >= CCOLS[controller])
return -1;
if (0) {
debug("goto: [%d,%d] mask=%d, controller=%d, size:%dx%d", row, col, currController, controller,
CROWS[controller], CCOLS[controller]);
}
/* 16x1 Displays are organized as 8x2 :-( */
if (CCOLS[controller] == 16 && CROWS[controller] == 1 && col > 7) {
row++;
col -= 8;
}
if (Capabilities & CAP_HD66712) {
/* the HD66712 doesn't have a braindamadged RAM layout */
pos = row * 32 + col;
} else {
/* 16x4 Controllers use a slightly different layout */
if (CCOLS[controller] == 16 && CROWS[controller] == 4) {
pos = (row % 2) * 64 + (row / 2) * 16 + col;
} else {
pos = (row % 2) * 64 + (row / 2) * 20 + col;
}
}
drv_HD_command(currController, (0x80 | pos), T_EXEC);
/* return columns left on current display */
return CCOLS[controller] - col;
}
static void drv_HD_write(const int row, const int col, const char *data, const int len)
{
int space = drv_HD_goto(row, col);
if (space > 0) {
drv_HD_data(currController, data, len > space ? space : len, T_EXEC);
}
}
static void drv_HD_defchar(const int ascii, const unsigned char *matrix)
{
int i;
char buffer[8];
for (i = 0; i < 8; i++) {
buffer[i] = matrix[i] & 0x1f;
}
/* define chars on *all* controllers! */
drv_HD_command(allControllers, 0x40 | 8 * ascii, T_EXEC);
drv_HD_data(allControllers, buffer, 8, T_WRCG);
}
#ifdef WITH_PARPORT
static int drv_HD_backlight(int backlight)
{
if (!(Capabilities & CAP_BACKLIGHT))
return -1;
if (backlight < 0)
backlight = 0;
if (backlight > 1)
backlight = 1;
drv_generic_parport_control(SIGNAL_BACKLIGHT, backlight ? SIGNAL_BACKLIGHT : 0);
return backlight;
}
#endif
static int drv_HD_brightness(int brightness)
{
char cmd;
if (!(Capabilities & CAP_BRIGHTNESS))
return -1;
if (brightness < 0)
brightness = 0;
if (brightness > 3)
brightness = 3;
cmd = '0' + brightness;
drv_HD_command(allControllers, 0x38, T_EXEC); /* enable function */
drv_HD_data(allControllers, &cmd, 1, T_WRCG); /* set brightness */
return brightness;
}
#ifdef WITH_PARPORT
static int drv_HD_GPO(const int num, const int val)
{
int v;
if (val > 0) {
/* set bit */