ihndlr.c

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00001 /*
00002  * Copyright (C) 2001-2005 by egnite Software GmbH. All rights reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions
00006  * are met:
00007  *
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the copyright holders nor the names of
00014  *    contributors may be used to endorse or promote products derived
00015  *    from this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS
00018  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00019  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
00020  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE
00021  * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00022  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
00023  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
00024  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
00025  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00026  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
00027  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00028  * SUCH DAMAGE.
00029  *
00030  * For additional information see http://www.ethernut.de/
00031  *
00032  */
00033 
00034 /*
00035  * $Log: ihndlr.c,v $
00036  * Revision 1.7  2008/07/26 09:38:02  haraldkipp
00037  * Added support for NUT_IRQMODE_NONE and NUT_IRQMODE_LEVEL.
00038  *
00039  * Revision 1.6  2006/10/08 16:48:09  haraldkipp
00040  * Documentation fixed
00041  *
00042  * Revision 1.5  2006/01/05 16:51:54  haraldkipp
00043  * NutIrqSetPriority() didn't correctly return the previous priority. This
00044  * bug has been fixed.
00045  * New function NutIrqSetMode() allows to modify the interrupt modes.
00046  *
00047  * Revision 1.4  2005/10/24 10:17:24  haraldkipp
00048  * New API functions added to create platform independant drivers.
00049  * Interrupt counting requires NUT_PERFMON to be defined.
00050  *
00051  * Revision 1.3  2005/08/02 17:46:47  haraldkipp
00052  * Major API documentation update.
00053  *
00054  * Revision 1.2  2005/07/26 16:30:58  haraldkipp
00055  * Copyright added.
00056  * Temporarily exclude NutRegisterIrqHandler() from Linux builds.
00057  *
00058  */
00059 
00060 #include <sys/atom.h>
00061 #include <dev/irqreg.h>
00062 
00067 
00071 void CallHandler(IRQ_HANDLER * irh)
00072 {
00073 #ifdef NUT_PERFMON
00074     irh->ir_count++;
00075 #endif
00076     if (irh->ir_handler)
00077         (irh->ir_handler) (irh->ir_arg);
00078 }
00079 
00094 #if !defined (__linux__) && !defined(__APPLE__) && !defined(__CYGWIN__)
00095 int NutRegisterIrqHandler(IRQ_HANDLER * irq, void (*handler) (void *), void *arg)
00096 {
00097     int rc = 0;
00098 
00099     /* Initialize this interrupt. */
00100     if (irq->ir_ctl) {
00101         rc = (irq->ir_ctl) (NUT_IRQCTL_INIT, NULL);
00102     }
00103 
00104     /* Set the interrupt handler. */
00105     irq->ir_arg = arg;
00106     irq->ir_handler = handler;
00107 
00108     return rc;
00109 }
00110 
00118 int NutIrqEnable(IRQ_HANDLER * irq)
00119 {
00120     int rc = -1;
00121 
00122     if (irq->ir_ctl) {
00123         rc = (irq->ir_ctl) (NUT_IRQCTL_ENABLE, NULL);
00124     }
00125     return rc;
00126 }
00127 
00135 int NutIrqDisable(IRQ_HANDLER * irq)
00136 {
00137     int rc = -1;
00138 
00139     if (irq->ir_ctl) {
00140         rc = (irq->ir_ctl) (NUT_IRQCTL_DISABLE, NULL);
00141     }
00142     return rc;
00143 }
00144 
00160 int NutIrqSetPriority(IRQ_HANDLER * irq, int level)
00161 {
00162     int rc = -1;
00163 
00164     if (irq->ir_ctl) {
00165         int prev;
00166 
00167         rc = (irq->ir_ctl) (NUT_IRQCTL_GETPRIO, &prev);
00168         if (rc == 0 && (rc = (irq->ir_ctl) (NUT_IRQCTL_SETPRIO, &level)) == 0) {
00169             rc = prev;
00170         }
00171     }
00172     return rc;
00173 }
00174 
00198 int NutIrqSetMode(IRQ_HANDLER * irq, int mode)
00199 {
00200     int rc = -1;
00201 
00202     if (irq->ir_ctl) {
00203         int prev;
00204 
00205         rc = (irq->ir_ctl) (NUT_IRQCTL_GETMODE, &prev);
00206         if (rc == 0 && (mode == NUT_IRQMODE_NONE || (rc = (irq->ir_ctl) (NUT_IRQCTL_SETMODE, &mode)) == 0)) {
00207             rc = prev;
00208         }
00209     }
00210     return rc;
00211 }
00212 
00213 #endif
00214 

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