hvc_irq.c

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/*
 * Copyright IBM Corp. 2001,2008
 *
 * This file contains the IRQ specific code for hvc_console
 *
 */

#include <linux/interrupt.h>

#include "hvc_console.h"

static irqreturn_t hvc_handle_interrupt(int irq, void *dev_instance)
{
    /* if hvc_poll request a repoll, then kick the hvcd thread */
    if (hvc_poll(dev_instance))
        hvc_kick();
    return IRQ_HANDLED;
}

/*
 * For IRQ based systems these callbacks can be used
 */
int notifier_add_irq(struct hvc_struct *hp, int irq)
{
    int rc;

    if (!irq) {
        hp->irq_requested = 0;
        return 0;
    }
    rc = request_irq(irq, hvc_handle_interrupt, 0,
               "hvc_console", hp);
    if (!rc)
        hp->irq_requested = 1;
    return rc;
}

void notifier_del_irq(struct hvc_struct *hp, int irq)
{
    if (!hp->irq_requested)
        return;
    free_irq(irq, hp);
    hp->irq_requested = 0;
}

void notifier_hangup_irq(struct hvc_struct *hp, int irq)
{
    notifier_del_irq(hp, irq);
}