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/* $Id: drv_generic_gpio.c 751 2007-01-20 13:52:43Z michael $
* $URL: https://ssl.bulix.org/svn/lcd4linux/branches/0.10.1/drv_generic_gpio.c $
*
* generic driver helper for GPO's
*
* Copyright (C) 2005 Michael Reinelt <reinelt@eunet.at>
* Copyright (C) 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 variables:
*
* extern int GPIS, GPOS; number of Inputs and Outputs
*
*
* these functions must be implemented by the real driver:
*
* int (*drv_generic_gpio_real_set) (const int num, const int val);
* sets GPO num to val, returns the actal value
*
* int (*drv_generic_gpio_real_get) (const int num);
* reads GPI num
*
*
* exported fuctions:
*
* int drv_generic_gpio_init(const char *section, const char *driver)
* initializes the generic GPIO driver
*
* int drv_generic_gpio_clear(void);
* resets all GPO's
*
* int drv_generic_gpio_get (const int num)
* returns value og GPI #num
*
* int drv_generic_gpio_draw(WIDGET * W)
* 'draws' GPO widget
* calls drv_generic_gpio_real_set()
*
* int drv_generic_gpio_quit(void)
* closes the generic GPIO driver
*
*/
#include "config.h"
#include <stdio.h>
#include "debug.h"
#include "plugin.h"
#include "widget.h"
#include "widget_gpo.h"
#include "drv_generic_gpio.h"
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif
#define MAX_GPIS 32
#define MAX_GPOS 32
static char *Section = NULL;
static char *Driver = NULL;
static int GPI[MAX_GPIS];
static int GPO[MAX_GPOS];
int GPOS = 0;
int GPIS = 0;
int (*drv_generic_gpio_real_set) () = NULL;
int (*drv_generic_gpio_real_get) () = NULL;
static void drv_generic_gpio_plugin_gpi(RESULT * result, RESULT * arg1)
{
int num;
double val;
num = R2N(arg1);
if (num <= 0 || num > GPIS) {
error("%s::GPI(%d): GPI out of range (1..%d)", Driver, num, GPIS);
SetResult(&result, R_STRING, "");
return;
}
val = drv_generic_gpio_get(num - 1);
SetResult(&result, R_NUMBER, &val);
}
static void drv_generic_gpio_plugin_gpo(RESULT * result, const int argc, RESULT * argv[])
{
int num, val;
double gpo;
switch (argc) {
case 1:
num = R2N(argv[0]);
if (num <= 0 || num > GPOS) {
error("%s::GPO(%d): GPO out of range (1..%d)", Driver, num, GPOS);
SetResult(&result, R_STRING, "");
return;
}
gpo = GPO[num - 1];
SetResult(&result, R_NUMBER, &gpo);
break;
case 2:
num = R2N(argv[0]);
val = R2N(argv[1]);
if (num <= 0 || num > GPOS) {
error("%s::GPO(%d): GPO out of range (1..%d)", Driver, num, GPOS);
SetResult(&result, R_STRING, "");
return;
}
if (GPO[num - 1] != val) {
if (drv_generic_gpio_real_set)
GPO[num - 1] = drv_generic_gpio_real_set(num - 1, val);
}
gpo = GPO[num - 1];
SetResult(&result, R_NUMBER, &gpo);
break;
default:
error("%s::GPO(): wrong number of parameters", Driver);
SetResult(&result, R_STRING, "");
}
}
int drv_generic_gpio_init(const char *section, const char *driver)
{
WIDGET_CLASS wc;
Section = (char *) section;
Driver = (char *) driver;
info("%s: using %d GPI's and %d GPO's", Driver, GPIS, GPOS);
/* reset all GPO's */
drv_generic_gpio_clear();
/* register gpo widget */
wc = Widget_GPO;
wc.draw = drv_generic_gpio_draw;
widget_register(&wc);
/* register plugins */
AddFunction("LCD::GPI", 1, drv_generic_gpio_plugin_gpi);
AddFunction("LCD::GPO", -1, drv_generic_gpio_plugin_gpo);
return 0;
}
int drv_generic_gpio_clear(void)
{
int i;
/* clear GPI buffer */
for (i = 0; i < MAX_GPIS; i++) {
GPI[i] = 0;
}
/* clear GPO buffer */
for (i = 0; i < MAX_GPOS; i++) {
GPO[i] = 0;
}
/* really clear GPO's */
for (i = 0; i < GPOS; i++) {
if (drv_generic_gpio_real_set)
GPO[i] = drv_generic_gpio_real_set(i, 0);
}
return 0;
}
int drv_generic_gpio_get(const int num)
{
int val = 0;
if (num < 0 || num >= GPIS) {
error("%s: gpio_get(%d): GPI out of range (0..%d)", Driver, num + 1, GPIS);
return -1;
}
if (drv_generic_gpio_real_get)
val = drv_generic_gpio_real_get(num);
GPI[num] = val;
return val;
}
int drv_generic_gpio_draw(WIDGET * W)
{
WIDGET_GPO *gpo = W->data;
int num, val;
num = W->row;
val = P2N(&gpo->expression);
if (num < 0 || num >= GPOS) {
error("%s: gpio_draw(%d): GPO out of range (0..%d)", Driver, num + 1, GPOS);
return -1;
}
if (GPO[num] != val) {
if (drv_generic_gpio_real_set)
GPO[num] = drv_generic_gpio_real_set(num, val);
}
return 0;
}
int drv_generic_gpio_quit(void)
{
info("%s: shutting down GPIO driver.", Driver);
drv_generic_gpio_clear();
return 0;
}
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