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Full Discussion: Doubt with irq handler.......
Top Forums UNIX for Dummies Questions & Answers Doubt with irq handler....... Post 302388729 by webquinty on Thursday 21st of January 2010 08:39:40 AM
Old 01-21-2010
Doubt with irq handler.......
Hello,

I have develop a driver for my hardware and now, I need to handle a IRQ but I does not work.

As I can understand, to handle a irq, it is necessary to make a request_irq(). If the return value is zero, ok, no problem to handle irq.

Here is a easy example of my driver:

Code:
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#include <linux/time.h>
#include <linux/ioport.h>
#include <linux/signal.h>
#include <linux/fcntl.h>
#include <linux/fs.h>
#include <linux/irq.h>

#define    INTERRUPT_5    5
#define    INTERRUPT_10    10

//#define SIG_TEST 44
unsigned int contador;
unsigned int contador1;

//**********************************************************************
static irqreturn_t my_irq_handler_5 (void)
{
    printk("Interrupcion %d ejecutada\n", INTERRUPT_5);
    wait_event_interruptible();
    return 0;
}

static irqreturn_t my_irq_handler_10 (void)
{
    printk("Interrupcion %d ejecutada\n", INTERRUPT_10);
    return 0;
}

//**********************************************************************

int xinit_module(void)
{
int ret;
    contador = 0;
    contador1 = 0;

    ret = request_irq(INTERRUPT_5, (irq_handler_t) my_irq_handler_5, IRQF_DISABLED, "leicif_INT5", NULL);
    printk("Valor de request_irq 5 %d\n", ret);

    ret = request_irq(INTERRUPT_10, (irq_handler_t) my_irq_handler_10, IRQF_DISABLED, "leicif_INT10", NULL);
    printk("Valor de request_irq 10 %d\n", ret);

        printk("wait for interrupt\n");
        printk("return code 0 \n");
        return 0;
}

void xcleanup_module(void)
{
        disable_irq(INTERRUPT_5);
        free_irq(INTERRUPT_5, NULL);
        disable_irq(INTERRUPT_10);
        free_irq(INTERRUPT_10, NULL);

        printk("closed\n");
}

module_init(xinit_module);
module_exit(xcleanup_module);

MODULE_LICENSE("GPL");

If I connect a square wave to INT5 and INT10, nothing happen.

Could somebody tell where is the error??

Best reagards
 

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LEARN ABOUT CENTOS

papi_remove_event

PAPI_remove_event(3)						       PAPI						      PAPI_remove_event(3)

NAME

       PAPI_remove_event -

       removes a hardware event from a PAPI event set.

SYNOPSIS

Detailed Description
       A hardware event can be either a PAPI Preset or a native hardware
       event code.  For a list of PAPI preset events, see PAPI_presets or
       run the papi_avail utility in the PAPI distribution.  PAPI Presets
       can be passed to PAPI_query_event to see if they exist on the
       underlying architecture.  For a list of native events available on
       the current platform, run papi_native_avail in the PAPI distribution.

       @par C Interface:
       int PAPI_remove_event( int  EventSet, int  EventCode );

       @param[in] EventSet
	  -- an integer handle for a PAPI event set as created
		by PAPI_create_eventset
       @param[in] EventCode
	  -- a defined event such as PAPI_TOT_INS or a native event.

       @retval PAPI_OK
	   Everything worked.
       @retval PAPI_EINVAL
	   One or more of the arguments is invalid.
       @retval PAPI_ENOEVST
	   The EventSet specified does not exist.
       @retval PAPI_EISRUN
	   The EventSet is currently counting events.
       @retval PAPI_ECNFLCT
	   The underlying counter hardware can not count this
		  event and other events in the EventSet simultaneously.
       @retval PAPI_ENOEVNT
	   The PAPI preset is not available on the underlying hardware.

       @par Example:

       *   int EventSet = PAPI_NULL;
       *   int ret;
       *
       *   // Create an empty EventSet
       *   ret = PAPI_create_eventset(&EventSet);
       *   if (ret != PAPI_OK) handle_error(ret);
       *
       *   // Add Total Instructions Executed to our EventSet
       *   ret = PAPI_add_event(EventSet, PAPI_TOT_INS);
       *   if (ret != PAPI_OK) handle_error(ret);
       *
       *   // Start counting
       *   ret = PAPI_start(EventSet);
       *   if (ret != PAPI_OK) handle_error(ret);
       *
       *   // Stop counting, ignore values
       *   ret = PAPI_stop(EventSet, NULL);
       *   if (ret != PAPI_OK) handle_error(ret);
       *
       *   // Remove event
       *   ret = PAPI_remove_event(EventSet, PAPI_TOT_INS);
       *   if (ret != PAPI_OK) handle_error(ret);
       *

       See Also:
	   PAPI_cleanup_eventset

	   PAPI_destroy_eventset

	   PAPI_event_name_to_code

	   PAPI_presets

	   PAPI_add_event

	   PAPI_add_events

Author
       Generated automatically by Doxygen for PAPI from the source code.

Version 5.2.0.0 						  Tue Jun 17 2014					      PAPI_remove_event(3)
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