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/** \file server/drivers/hd44780-usblcd.c
* \c ucdlcd connection type of \c hd44780 driver for Hitachi HD44780 based LCD
* displays. This driver does only work with Linux and requires a kernel driver
* available since 2.4.20-pre7.
*
* See http://www.usblcd.de for hardware and documentation.
*/
/*
* Copyright (C) 2002 Adams IT Services <info@usblcd.de>
*
* This driver is based on pic-an-lcd driver. See file hd44780-serial.c for
* additional Copyrights.
*
* This file is released under the GNU General Public License. Refer to the
* COPYING file distributed with this package.
*
* Modified February 2009 by Markus Dolze to use API v0.5.
*/
#include "hd44780-usblcd.h"
#include "hd44780-low.h"
#include "report.h"
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#define DEFAULT_DEVICE "/dev/usb/lcd"
#define IOCTL_GET_HARD_VERSION 1
#define IOCTL_GET_DRV_VERSION 2
void usblcd_HD44780_senddata(PrivateData *p, unsigned char displayID, unsigned char flags, unsigned char ch);
void usblcd_HD44780_backlight(PrivateData *p, unsigned char state);
void usblcd_HD44780_close(PrivateData *p);
/**
* Initialize the driver.
* \param drvthis Pointer to driver structure.
* \retval 0 Success.
* \retval -1 Error opening device.
* \retval -2 Error reading or unsupported driver version.
* \retval -3 Error reading or unsupported hardware version.
*/
int
hd_init_usblcd(Driver *drvthis)
{
PrivateData *p = (PrivateData *) drvthis->private_data;
char device[256] = DEFAULT_DEVICE;
char buf[128];
int major, minor;
/* Get device to use */
strncpy(device, drvthis->config_get_string(drvthis->name, "device", 0, DEFAULT_DEVICE), sizeof(device));
device[sizeof(device) - 1] = '\0';
report(RPT_INFO, "HD44780: USBLCD: using device: %s", device);
/* Set up io port correctly, and open it... */
p->fd = open(device, O_RDWR | O_NOCTTY | O_NDELAY);
if (p->fd == -1) {
report(RPT_ERR, "HD44780: USBLCD: could not open device %s (%s)", device, strerror(errno));
return -1;
}
/* Read and check kernel driver version */
memset(buf, 0, 128);
if (ioctl(p->fd, IOCTL_GET_DRV_VERSION, buf) != 0) {
report(RPT_ERR, "IOCTL failed, could not get Driver Version");
return -2;
}
report(RPT_INFO, "Driver Version: %s", buf);
if (sscanf(buf, "USBLCD Driver Version %d.%d", &major, &minor) != 2) {
report(RPT_ERR, "Could not read Driver Version");
return -2;
}
if (major != 1) {
report(RPT_ERR, "Driver Version not supported");
return -2;
}
/* Read and check hardware version */
memset(buf, 0, 128);
if (ioctl(p->fd, IOCTL_GET_HARD_VERSION, buf) != 0) {
report(RPT_ERR, "IOCTL failed, could not get Hardware Version");
return -3;
};
report(RPT_INFO, "Hardware Version: %s", buf);
if (sscanf(buf, "%d.%d", &major, &minor) != 2) {
report(RPT_ERR, "Could not read Hardware Version");
return -3;
};
if (major != 1) {
report(RPT_ERR, "Hardware Version not supported");
return -3;
}
/* Set local functions */
p->hd44780_functions->senddata = usblcd_HD44780_senddata;
p->hd44780_functions->backlight = usblcd_HD44780_backlight;
p->hd44780_functions->close = usblcd_HD44780_close;
common_init(p, IF_8BIT);
return 0;
}
/**
* Send data or commands to the display.
* \param p Pointer to driver's private data structure.
* \param displayID ID of the display (or 0 for all) to send data to.
* \param flags Defines whether to end a command or data.
* \param ch The value to send.
*/
void
usblcd_HD44780_senddata(PrivateData *p, unsigned char displayID, unsigned char flags, unsigned char ch)
{
static const char instr_byte = 0;
if (flags == RS_DATA) {
/*
* Escape data byte 0x00 by sending it twice because it is
* used as instruction byte
*/
if (ch == '\0')
write(p->fd, &ch, 1);
write(p->fd, &ch, 1);
} else {
/* Instructions are sent prepending 0x00 as escape sequence */
write(p->fd, &instr_byte, 1);
write(p->fd, &ch, 1);
}
}
/**
* Turn display backlight on or off.
* \param p Pointer to driver's private data structure.
* \param state New backlight status.
*/
void
usblcd_HD44780_backlight(PrivateData *p, unsigned char state)
{
static const char instr_byte = 0;
static const char bl_on = 0x21;
static const char bl_off = 0x20;
write(p->fd, &instr_byte, 1);
if (state == BACKLIGHT_OFF)
write(p->fd, &bl_off, 1);
else
write(p->fd, &bl_on, 1);
}
/**
* Close the driver (do necessary clean-up).
* \param p Pointer to driver's private data structure.
*/
void
usblcd_HD44780_close(PrivateData *p)
{
if (p->fd >= 0)
close(p->fd);
}
/* EOF */
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