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| 1 | /* |
| 2 | * Copyright IBM Corp. 2001,2008 |
| 3 | * |
| 4 | * This file contains the IRQ specific code for hvc_console |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include <linux/interrupt.h> |
| 9 | |
| 10 | #include "hvc_console.h" |
| 11 | |
| 12 | static irqreturn_t hvc_handle_interrupt(int irq, void *dev_instance) |
| 13 | { |
| 14 | /* if hvc_poll request a repoll, then kick the hvcd thread */ |
| 15 | if (hvc_poll(dev_instance)) |
| 16 | hvc_kick(); |
| 17 | return IRQ_HANDLED; |
| 18 | } |
| 19 | |
| 20 | /* |
| 21 | * For IRQ based systems these callbacks can be used |
| 22 | */ |
| 23 | int notifier_add_irq(struct hvc_struct *hp, int irq) |
| 24 | { |
| 25 | int rc; |
| 26 | |
| 27 | if (!irq) { |
| 28 | hp->irq_requested = 0; |
| 29 | return 0; |
| 30 | } |
| 31 | rc = request_irq(irq, hvc_handle_interrupt, 0, |
| 32 | "hvc_console", hp); |
| 33 | if (!rc) |
| 34 | hp->irq_requested = 1; |
| 35 | return rc; |
| 36 | } |
| 37 | |
| 38 | void notifier_del_irq(struct hvc_struct *hp, int irq) |
| 39 | { |
| 40 | if (!hp->irq_requested) |
| 41 | return; |
| 42 | free_irq(irq, hp); |
| 43 | hp->irq_requested = 0; |
| 44 | } |
| 45 | |
| 46 | void notifier_hangup_irq(struct hvc_struct *hp, int irq) |
| 47 | { |
| 48 | notifier_del_irq(hp, irq); |
| 49 | } |
| 50 |
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