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55 lines
1.0 KiB
55 lines
1.0 KiB
// 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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