56 lines
1 KiB
C
56 lines
1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2001,2008
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*
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* This file contains the IRQ specific code for hvc_console
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*
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*/
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#include <linux/interrupt.h>
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#include "hvc_console.h"
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static irqreturn_t hvc_handle_interrupt(int irq, void *dev_instance)
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{
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/* if hvc_poll request a repoll, then kick the hvcd thread */
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if (hvc_poll(dev_instance))
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hvc_kick();
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/*
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* We're safe to always return IRQ_HANDLED as the hvcd thread will
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* iterate through each hvc_struct.
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*/
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return IRQ_HANDLED;
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}
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/*
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* For IRQ based systems these callbacks can be used
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*/
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int notifier_add_irq(struct hvc_struct *hp, int irq)
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{
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int rc;
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if (!irq) {
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hp->irq_requested = 0;
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return 0;
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}
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rc = request_irq(irq, hvc_handle_interrupt, hp->flags,
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"hvc_console", hp);
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if (!rc)
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hp->irq_requested = 1;
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return rc;
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}
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void notifier_del_irq(struct hvc_struct *hp, int irq)
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{
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if (!hp->irq_requested)
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return;
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free_irq(irq, hp);
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hp->irq_requested = 0;
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}
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void notifier_hangup_irq(struct hvc_struct *hp, int irq)
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{
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notifier_del_irq(hp, irq);
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}
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