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archived-lcd4linux/drv_ASTUSB.c
michael 204a50d00f ooops... forgot to add drv_ASTUSB.c 
git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@1124 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
2010-06-25 03:22:39 +00:00

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/* $Id: $
* $URL: $
*
* driver for Attiny2313 USB LCD display interface
* see http://ast.m-faq.de/USB-LCD/USB-LCD.htm for schematics
*
* Copyright 2005 Till Harbaum <till@harbaum.org>
* Copyright 2005 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
*
* 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_LCD2USB
*
*/
#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 <ctype.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <usb.h>
#include "debug.h"
#include "cfg.h"
#include "timer.h"
#include "qprintf.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"
#define LCD_USB_VENDOR 0x03eb
#define LCD_USB_DEVICE 0x7a53
#define CMD_LCD_ECHO (0<<5)
#define CMD_LCD_INIT 1
#define CMD_LCD_COMMAND 2
#define CMD_LCD_DATA 3
#define CMD_LCD_BLIGHT 4
/* target is a bit map for CMD/DATA */
#define LCD_CTRL_0 (1<<0)
#define LCD_CTRL_1 (1<<1)
#define LCD_BOTH (LCD_CTRL_0 | LCD_CTRL_1)
static char Name[] = "ASTUSB";
static char *device_id = NULL, *bus_id = NULL;
static usb_dev_handle *lcd;
static int controllers = 0;
extern int got_signal;
enum {
LCD_INIT_INCREASE = 1 << 0,
LCD_INIT_SHIFT = 1 << 1,
LCD_INIT_CON = 1 << 2,
LCD_INIT_BON = 1 << 3,
LCD_INIT_DSHIFT = 1 << 4,
LCD_INIT_RSHIFT = 1 << 5,
LCD_INIT_2LINES = 1 << 6,
LCD_INIT_FONT = 1 << 7
};
/****************************************/
/*** hardware dependant functions ***/
/****************************************/
static int drv_AST_HW_open(char *bus_id, char *device_id)
{
struct usb_bus *busses, *bus;
struct usb_device *dev;
lcd = NULL;
info("%s: scanning USB for ASTUSB interface ...", Name);
if (bus_id != NULL)
info("%s: scanning for bus id: %s", Name, bus_id);
if (device_id != NULL)
info("%s: scanning for device id: %s", Name, device_id);
usb_set_debug(0);
usb_init();
usb_find_busses();
usb_find_devices();
busses = usb_get_busses();
for (bus = busses; bus; bus = bus->next) {
/* search this bus if no bus id was given or if this is the given bus id */
if (!bus_id || (bus_id && !strcasecmp(bus->dirname, bus_id))) {
for (dev = bus->devices; dev; dev = dev->next) {
/* search this device if no device id was given or if this is the given device id */
if (!device_id || (device_id && !strcasecmp(dev->filename, device_id))) {
if ((dev->descriptor.idVendor == LCD_USB_VENDOR) && (dev->descriptor.idProduct == LCD_USB_DEVICE)) {
info("%s: found ASTUSB interface on bus %s device %s", Name, bus->dirname, dev->filename);
lcd = usb_open(dev);
if (usb_claim_interface(lcd, 0) < 0) {
error("%s: usb_claim_interface() failed!", Name);
return -1;
}
return 0;
}
}
}
}
}
return -1;
}
static int drv_AST_HW_close(void)
{
usb_release_interface(lcd, 0);
usb_close(lcd);
return 0;
}
static int drv_AST_HW_data(unsigned char *buffer, short length, int __attribute__ ((unused)) index)
{
int request = CMD_LCD_DATA;
int value = 0;
if (usb_control_msg
(lcd, USB_TYPE_VENDOR | USB_RECIP_DEVICE, request, value, 0 /*index */ , (char *) buffer, length, 1000) < 0) {
error("%s: USB request failed! Trying to reconnect device.", Name);
usb_release_interface(lcd, 0);
usb_close(lcd);
/* try to close and reopen connection */
if (drv_AST_HW_open(bus_id, device_id) < 0) {
error("%s: could not re-detect ASTUSB USB LCD", Name);
got_signal = -1;
return -1;
}
/* and try to re-send command */
if (usb_control_msg
(lcd, USB_TYPE_VENDOR | USB_RECIP_DEVICE, request, value, 0 /*index */ , (char *) buffer, length,
1000) < 0) {
error("%s: retried USB request failed, aborting!", Name);
got_signal = -1;
return -1;
}
info("%s: Device successfully reconnected.", Name);
}
return 0;
}
/* send a number of 16 bit words to the lcd2usb interface */
/* and verify that they are correctly returned by the echo */
/* command. This may be used to check the reliability of */
/* the usb interfacing */
#define ECHO_NUM 10
static int drv_AST_HW_cmd(unsigned char cmd, short value, int __attribute__ ((unused)) index)
{
unsigned char buffer[2];
int nBytes;
/* send control request and accept return value */
nBytes = usb_control_msg(lcd,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN,
cmd, value, 0 /*index */ , (char *) buffer, sizeof(buffer), 1000);
if (nBytes < 0) {
error("%s: USB request failed!", Name);
return -1;
}
return buffer[0] + 256 * buffer[1];
}
int drv_AST_HW_echo(void)
{
int i, errors = 0;
char val;
char buffer[2];
for (i = 0; i < ECHO_NUM; i++) {
val = rand() & 0xff; //8 bit number
if (usb_control_msg(lcd,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN,
CMD_LCD_ECHO, val, 0, buffer, sizeof(buffer), 1000) < 0) {
error("%s: USB request failed!", Name);
return -1;
}
if (val != buffer[1])
errors++;
}
if (errors) {
error("%s: ERROR, %d out of %d echo transfers failed!", Name, errors, ECHO_NUM);
return -1;
} else
info("%s: echo test successful", Name);
return 0;
}
/* command format:
* 7 6 5 4 3 2 1 0
* C C C T T R L L
*
* TT = target bit map
* R = reserved for future use, set to 0
* LL = number of bytes in transfer - 1
*/
short drv_AST_LCD_BL(int backlight)
{
if (backlight < 0)
backlight = 0;
else if (backlight > 1)
backlight = 1;
drv_AST_HW_cmd(CMD_LCD_BLIGHT, backlight, 0);
return backlight;
}
static void drv_AST_clear(void)
{
drv_AST_HW_cmd(CMD_LCD_COMMAND, 0x01, LCD_BOTH & controllers); /* clear display */
drv_AST_HW_cmd(CMD_LCD_COMMAND, 0x03, LCD_BOTH & controllers); /* return home */
}
static void drv_AST_write(const int row, const int col, const char *data, int len)
{
int pos, ctrl = LCD_CTRL_0;
int tmpRow = row;
/* displays with more two rows and 20 columns have a logical width */
/* of 40 chars and use more than one controller */
if ((DROWS > 2) && (DCOLS > 20) && (row > 1)) {
/* use second controller */
tmpRow -= 2;
ctrl = LCD_CTRL_1;
}
/* 16x4 Displays use a slightly different layout */
if (DCOLS == 16 && DROWS == 4) {
pos = (tmpRow % 2) * 64 + (tmpRow / 2) * 16 + col;
} else {
pos = (tmpRow % 2) * 64 + (tmpRow / 2) * 20 + col;
}
drv_AST_HW_cmd(CMD_LCD_COMMAND, 0x80 | pos, (ctrl & controllers));
drv_AST_HW_data((unsigned char *) data, len, (ctrl & controllers));
}
static void drv_AST_defchar(const int ascii, const unsigned char *matrix)
{
int i;
unsigned char buffer[8];
//build buffer
for (i = 0; i < 8; i++) {
buffer[i] = *matrix++ & 0x1f;
}
//send to HW
drv_AST_HW_cmd(CMD_LCD_COMMAND, 0x40 | 8 * ascii, LCD_BOTH & controllers);
drv_AST_HW_data((unsigned char *) buffer, sizeof(buffer), LCD_BOTH & controllers);
}
static int drv_AST_start(const char *section, const int quiet)
{
// int contrast, brightness;
int backlight;
int rows = -1, cols = -1;
char *s;
s = cfg_get(section, "Size", NULL);
if (s == NULL || *s == '\0') {
error("%s: no '%s.Size' entry from %s", Name, section, cfg_source());
return -1;
}
if (sscanf(s, "%dx%d", &cols, &rows) != 2 || rows < 1 || cols < 1) {
error("%s: bad %s.Size '%s' from %s", Name, section, s, cfg_source());
free(s);
return -1;
}
DROWS = rows;
DCOLS = cols;
/* bus id and device id are strings and not just intergers, since */
/* the windows port of libusb treats them as strings. And this way */
/* we keep windows compatibility ... just in case ... */
bus_id = cfg_get(section, "Bus", NULL);
device_id = cfg_get(section, "Device", NULL);
if (drv_AST_HW_open(bus_id, device_id) < 0) {
error("%s: could not find a ASTUSB USB LCD", Name);
return -1;
}
/* test interface reliability */
drv_AST_HW_echo();
/*low level init of init LCD */
if (drv_AST_HW_cmd(CMD_LCD_INIT, LCD_INIT_INCREASE | (DROWS > 1 ? LCD_INIT_2LINES : 1), LCD_BOTH & controllers) < 0) {
error("%s: could not init LCD", Name);
return -1;
}
if (cfg_number(section, "Backlight", 0, 0, 1, &backlight) > 0) {
info("%s: backlight %s", Name, backlight ? "enabled" : "disabled");
drv_AST_LCD_BL(backlight);
}
drv_AST_clear(); /* clear display */
if (!quiet) {
char buffer[40];
qprintf(buffer, sizeof(buffer), "%s %dx%d", Name, DCOLS, DROWS);
if (drv_generic_text_greet(buffer, "AST USB-LCD")) {
sleep(3);
drv_AST_clear();
}
}
return 0;
}
/****************************************/
/*** plugins ***/
/****************************************/
static void plugin_backlight(RESULT * result, RESULT * arg1)
{
double backlight;
backlight = drv_AST_LCD_BL(R2N(arg1));
SetResult(&result, R_NUMBER, &backlight);
}
/****************************************/
/*** widget callbacks ***/
/****************************************/
/* using drv_generic_text_draw(W) */
/* using drv_generic_text_icon_draw(W) */
/* using drv_generic_text_bar_draw(W) */
/****************************************/
/*** exported functions ***/
/****************************************/
/* list models */
int drv_AST_list(void)
{
printf("ASTUSB display interface");
return 0;
}
/* initialize driver & display */
int drv_AST_init(const char *section, const int quiet)
{
WIDGET_CLASS wc;
int asc255bug;
int ret;
info("%s: %s", Name, "$Rev: 975 $");
/* display preferences */
XRES = 5; /* pixel width of one char */
YRES = 8; /* pixel height of one char */
CHARS = 8; /* number of user-defineable characters */
CHAR0 = 0; /* ASCII of first user-defineable char */
GOTO_COST = 2; /* number of bytes a goto command requires */
/* real worker functions */
drv_generic_text_real_write = drv_AST_write;
drv_generic_text_real_defchar = drv_AST_defchar;
/* start display */
if ((ret = drv_AST_start(section, quiet)) != 0)
return ret;
/* initialize generic text driver */
if ((ret = drv_generic_text_init(section, Name)) != 0)
return ret;
/* initialize generic icon driver */
if ((ret = drv_generic_text_icon_init()) != 0)
return ret;
/* initialize generic bar driver */
if ((ret = drv_generic_text_bar_init(0)) != 0)
return ret;
/* add fixed chars to the bar driver */
/* most displays have a full block on ascii 255, but some have kind of */
/* an 'inverted P'. If you specify 'asc255bug 1 in the config, this */
/* char will not be used, but rendered by the bar driver */
cfg_number(section, "asc255bug", 0, 0, 1, &asc255bug);
drv_generic_text_bar_add_segment(0, 0, 255, 32); /* ASCII 32 = blank */
if (!asc255bug)
drv_generic_text_bar_add_segment(255, 255, 255, 255); /* ASCII 255 = block */
/* register text widget */
wc = Widget_Text;
wc.draw = drv_generic_text_draw;
widget_register(&wc);
/* register icon widget */
wc = Widget_Icon;
wc.draw = drv_generic_text_icon_draw;
widget_register(&wc);
/* register bar widget */
wc = Widget_Bar;
wc.draw = drv_generic_text_bar_draw;
widget_register(&wc);
/* register plugins */
// AddFunction("LCD::contrast", 1, plugin_contrast);
// AddFunction("LCD::brightness", 1, plugin_brightness);
AddFunction("LCD::backlight", 1, plugin_backlight);
return 0;
}
/* close driver & display */
int drv_AST_quit(const int quiet)
{
info("%s: shutting down.", Name);
drv_generic_text_quit();
/* clear display */
drv_AST_clear();
/* say goodbye... */
if (!quiet) {
drv_generic_text_greet("That's all, folks!", NULL);
}
drv_AST_LCD_BL(0);
debug("closing USB connection");
drv_AST_HW_close();
return (0);
}
DRIVER drv_ASTUSB = {
.name = Name,
.list = drv_AST_list,
.init = drv_AST_init,
.quit = drv_AST_quit,
};
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