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

/*
 *  drivers/s390/cio/device.c
 *  bus driver for ccw devices
 *   $Revision: 1.131 $
 *
 *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
 *			 IBM Corporation
 *    Author(s): Arnd Bergmann (arndb@de.ibm.com)
 *		 Cornelia Huck (cohuck@de.ibm.com)
 *		 Martin Schwidefsky (schwidefsky@de.ibm.com)
 */
#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/device.h>
#include <linux/workqueue.h>

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

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

/******************* bus type handling ***********************/

/* The Linux driver model distinguishes between a bus type and
 * the bus itself. Of course we only have one channel
 * subsystem driver and one channel system per machine, but
 * we still use the abstraction. T.R. says it's a good idea. */
static int
ccw_bus_match (struct device * dev, struct device_driver * drv)
{
	struct ccw_device *cdev = to_ccwdev(dev);
	struct ccw_driver *cdrv = to_ccwdrv(drv);
	const struct ccw_device_id *ids = cdrv->ids, *found;

	if (!ids)
		return 0;

	found = ccw_device_id_match(ids, &cdev->id);
	if (!found)
		return 0;

	cdev->id.driver_info = found->driver_info;

	return 1;
}

/*
 * Hotplugging interface for ccw devices.
 * Heavily modeled on pci and usb hotplug.
 */
static int
ccw_hotplug (struct device *dev, char **envp, int num_envp,
	     char *buffer, int buffer_size)
{
	struct ccw_device *cdev = to_ccwdev(dev);
	int i = 0;
	int length = 0;

	if (!cdev)
		return -ENODEV;

	/* what we want to pass to /sbin/hotplug */

	envp[i++] = buffer;
	length += scnprintf(buffer, buffer_size - length, "CU_TYPE=%04X",
			   cdev->id.cu_type);
	if ((buffer_size - length <= 0) || (i >= num_envp))
		return -ENOMEM;
	++length;
	buffer += length;

	envp[i++] = buffer;
	length += scnprintf(buffer, buffer_size - length, "CU_MODEL=%02X",
			   cdev->id.cu_model);
	if ((buffer_size - length <= 0) || (i >= num_envp))
		return -ENOMEM;
	++length;
	buffer += length;

	/* The next two can be zero, that's ok for us */
	envp[i++] = buffer;
	length += scnprintf(buffer, buffer_size - length, "DEV_TYPE=%04X",
			   cdev->id.dev_type);
	if ((buffer_size - length <= 0) || (i >= num_envp))
		return -ENOMEM;
	++length;
	buffer += length;

	envp[i++] = buffer;
	length += scnprintf(buffer, buffer_size - length, "DEV_MODEL=%02X",
			   cdev->id.dev_model);
	if ((buffer_size - length <= 0) || (i >= num_envp))
		return -ENOMEM;

	envp[i] = 0;

	return 0;
}

struct bus_type ccw_bus_type = {
	.name  = "ccw",
	.match = &ccw_bus_match,
	.hotplug = &ccw_hotplug,
};

static int io_subchannel_probe (struct device *)