path: root/drivers/s390/cio/device_fsm.c

/*
 * drivers/s390/cio/device_fsm.c
 * finite state machine for device handling
 *
 *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
 *			 IBM Corporation
 *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
 *		 Martin Schwidefsky (schwidefsky@de.ibm.com)
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/string.h>

#include <asm/ccwdev.h>
#include <asm/cio.h>

#include "cio.h"
#include "cio_debug.h"
#include "css.h"
#include "device.h"
#include "chsc.h"
#include "ioasm.h"

int
device_is_online(struct subchannel *sch)
{
	struct ccw_device *cdev;

	if (!sch->dev.driver_data)
		return 0;
	cdev = sch->dev.driver_data;
	return (cdev->private->state == DEV_STATE_ONLINE);
}

int
device_is_disconnected(struct subchannel *sch)
{
	struct ccw_device *cdev;

	if (!sch->dev.driver_data)
		return 0;
	cdev = sch->dev.driver_data;
	return (cdev->private->state == DEV_STATE_DISCONNECTED ||
		cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
}

void
device_set_disconnected(struct subchannel *sch)
{
	struct ccw_device *cdev;

	if (!sch->dev.driver_data)
		return;
	cdev = sch->dev.driver_data;
	ccw_device_set_timeout(cdev, 0);
	cdev->private->flags.fake_irb = 0;
	cdev->private->state = DEV_STATE_DISCONNECTED;
}

void
device_set_waiting(struct subchannel *sch)
{
	struct ccw_device *cdev;

	if (!sch->dev.driver_data)
		return;
	cdev = sch->dev.driver_data;
	ccw_device_set_timeout(cdev, 10*HZ);
	cdev->private->state = DEV_STATE_WAIT4IO;
}

/*
 * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
 */
static void
ccw_device_timeout(unsigned long data)
{
	struct ccw_device *cdev;

	cdev = (struct ccw_device *) data;
	spin_lock_irq(cdev->ccwlock);
	dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
	spin_unlock_irq(cdev->ccwlock);
}

/*
 * Set timeout
 */
void
ccw_device_set_timeout(struct ccw_device *cdev, int expires)
{
	if (expires == 0) {
		del_timer(&cdev->private->timer);
		return;
	}
	if (timer_pending(&cdev->private->timer))