// SPDX-License-Identifier: GPL-2.0
/*
 * 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();

        /*
         * We're safe to always return IRQ_HANDLED as the hvcd thread will
         * iterate through each hvc_struct.
         */
        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, hp->flags,
                        "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);
}