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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright IBM Corp. 2001,20084 *5 * This file contains the IRQ specific code for hvc_console6 *7 */8 9#include <linux/interrupt.h>10 11#include "hvc_console.h"12 13static irqreturn_t hvc_handle_interrupt(int irq, void *dev_instance)14{15 /* if hvc_poll request a repoll, then kick the hvcd thread */16 if (hvc_poll(dev_instance))17 hvc_kick();18 19 /*20 * We're safe to always return IRQ_HANDLED as the hvcd thread will21 * iterate through each hvc_struct.22 */23 return IRQ_HANDLED;24}25 26/*27 * For IRQ based systems these callbacks can be used28 */29int notifier_add_irq(struct hvc_struct *hp, int irq)30{31 int rc;32 33 if (!irq) {34 hp->irq_requested = 0;35 return 0;36 }37 rc = request_irq(irq, hvc_handle_interrupt, hp->flags,38 "hvc_console", hp);39 if (!rc)40 hp->irq_requested = 1;41 return rc;42}43 44void notifier_del_irq(struct hvc_struct *hp, int irq)45{46 if (!hp->irq_requested)47 return;48 free_irq(irq, hp);49 hp->irq_requested = 0;50}51 52void notifier_hangup_irq(struct hvc_struct *hp, int irq)53{54 notifier_del_irq(hp, irq);55}56