[net-next-2.6.git] / drivers / char / hvc_irq.c

/*
 * 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();
	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, IRQF_DISABLED,
			   "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);
}
Commit	Line	Data
611e097d CB	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, IRQF_DISABLED,
	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	{
c21f7a52	40	if (!hp->irq_requested)
611e097d CB	41	return;
	42	free_irq(irq, hp);
	43	hp->irq_requested = 0;
	44	}
fc362e2e HB	45
	46	void notifier_hangup_irq(struct hvc_struct *hp, int irq)
	47	{
	48	notifier_del_irq(hp, irq);
	49	}