drivers/eisa/eisa-bus.c - pub/scm/linux/kernel/git/jesse/openvswitch - Git at Google

 /*
  * EISA bus support functions for sysfs.
  *
  * (C) 2002, 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
  *
  * This code is released under the GPL version 2.
  */

 #include <linux/kernel.h>
 #include <linux/device.h>
 #include <linux/eisa.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/ioport.h>
 #include <asm/io.h>

 #define SLOT_ADDRESS(r,n) (r->bus_base_addr + (0x1000 * n))

 #define EISA_DEVINFO(i,s) { .id = { .sig = i }, .name = s }

 struct eisa_device_info {
 	struct eisa_device_id id;
 	char name[DEVICE_NAME_SIZE];
 };

 #ifdef CONFIG_EISA_NAMES
 static struct eisa_device_info __initdata eisa_table[] = {
 #include "devlist.h"
 };
 #define EISA_INFOS (sizeof (eisa_table) / (sizeof (struct eisa_device_info)))
 #endif

 #define EISA_MAX_FORCED_DEV 16

 static int enable_dev[EISA_MAX_FORCED_DEV];
 static int enable_dev_count;
 static int disable_dev[EISA_MAX_FORCED_DEV];
 static int disable_dev_count;

 static int is_forced_dev (int *forced_tab,
 			  int forced_count,
 			  struct eisa_root_device *root,
 			  struct eisa_device *edev)
 {
 	int i, x;

 	for (i = 0; i < forced_count; i++) {
 		x = (root->bus_nr << 8) | edev->slot;
 		if (forced_tab[i] == x)
 			return 1;
 	}

 	return 0;
 }

 static void __init eisa_name_device (struct eisa_device *edev)
 {
 #ifdef CONFIG_EISA_NAMES
 	int i;
 	for (i = 0; i < EISA_INFOS; i++) {
 		if (!strcmp (edev->id.sig, eisa_table[i].id.sig)) {
 			strlcpy (edev->pretty_name,
 				 eisa_table[i].name,
 				 DEVICE_NAME_SIZE);
 			return;
 		}
 	}

 	/* No name was found */
 	sprintf (edev->pretty_name, "EISA device %.7s", edev->id.sig);
 #endif
 }

 static char __init *decode_eisa_sig(unsigned long addr)
 {
         static char sig_str[EISA_SIG_LEN];
 	u8 sig[4];
         u16 rev;
 	int i;

 	for (i = 0; i < 4; i++) {
 #ifdef CONFIG_EISA_VLB_PRIMING
 		/*
 		 * This ugly stuff is used to wake up VL-bus cards
 		 * (AHA-284x is the only known example), so we can
 		 * read the EISA id.
 		 *
 		 * Thankfully, this only exists on x86...
 		 */
 		outb(0x80 + i, addr);
 #endif
 		sig[i] = inb (addr + i);

 		if (!i && (sig[0] & 0x80))
 			return NULL;
 	}

         sig_str[0] = ((sig[0] >> 2) & 0x1f) + ('A' - 1);
         sig_str[1] = (((sig[0] & 3) << 3) | (sig[1] >> 5)) + ('A' - 1);
         sig_str[2] = (sig[1] & 0x1f) + ('A' - 1);
         rev = (sig[2] << 8) | sig[3];
         sprintf(sig_str + 3, "%04X", rev);

         return sig_str;
 }

 static int eisa_bus_match (struct device *dev, struct device_driver *drv)
 {
 	struct eisa_device *edev = to_eisa_device (dev);
 	struct eisa_driver *edrv = to_eisa_driver (drv);
 	const struct eisa_device_id *eids = edrv->id_table;

 	if (!eids)
 		return 0;

 	while (strlen (eids->sig)) {
 		if (!strcmp (eids->sig, edev->id.sig) &&
 		    edev->state & EISA_CONFIG_ENABLED) {
 			edev->id.driver_data = eids->driver_data;
 			return 1;
 		}

 		eids++;
 	}

 	return 0;
 }

 struct bus_type eisa_bus_type = {
 	.name  = "eisa",
 	.match = eisa_bus_match,
 };

 int eisa_driver_register (struct eisa_driver *edrv)
 {
 	int r;

 	edrv->driver.bus = &eisa_bus_type;
 	if ((r = driver_register (&edrv->driver)) < 0)
 		return r;

 	return 0;
 }

 void eisa_driver_unregister (struct eisa_driver *edrv)
 {
 	driver_unregister (&edrv->driver);
 }

 static ssize_t eisa_show_sig (struct device *dev, struct device_attribute *attr, char *buf)
 {
         struct eisa_device *edev = to_eisa_device (dev);
         return sprintf (buf,"%s\n", edev->id.sig);
 }

 static DEVICE_ATTR(signature, S_IRUGO, eisa_show_sig, NULL);

 static ssize_t eisa_show_state (struct device *dev, struct device_attribute *attr, char *buf)
 {
         struct eisa_device *edev = to_eisa_device (dev);
         return sprintf (buf,"%d\n", edev->state & EISA_CONFIG_ENABLED);
 }

 static DEVICE_ATTR(enabled, S_IRUGO, eisa_show_state, NULL);

 static int __init eisa_init_device (struct eisa_root_device *root,
 				    struct eisa_device *edev,
 				    int slot)
 {
 	char *sig;
         unsigned long sig_addr;
 	int i;

 	sig_addr = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET;

 	if (!(sig = decode_eisa_sig (sig_addr)))
 		return -1;	/* No EISA device here */

 	memcpy (edev->id.sig, sig, EISA_SIG_LEN);
 	edev->slot = slot;
 	edev->state = inb (SLOT_ADDRESS (root, slot) + EISA_CONFIG_OFFSET) & EISA_CONFIG_ENABLED;
 	edev->base_addr = SLOT_ADDRESS (root, slot);
 	edev->dma_mask = root->dma_mask; /* Default DMA mask */
 	eisa_name_device (edev);
 	edev->dev.parent = root->dev;
 	edev->dev.bus = &eisa_bus_type;
 	edev->dev.dma_mask = &edev->dma_mask;
 	edev->dev.coherent_dma_mask = edev->dma_mask;
 	sprintf (edev->dev.bus_id, "%02X:%02X", root->bus_nr, slot);

 	for (i = 0; i < EISA_MAX_RESOURCES; i++) {
 #ifdef CONFIG_EISA_NAMES
 		edev->res[i].name = edev->pretty_name;
 #else
 		edev->res[i].name = edev->id.sig;
 #endif
 	}

 	if (is_forced_dev (enable_dev, enable_dev_count, root, edev))
 		edev->state = EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED;

 	if (is_forced_dev (disable_dev, disable_dev_count, root, edev))
 		edev->state = EISA_CONFIG_FORCED;

 	return 0;
 }

 static int __init eisa_register_device (struct eisa_device *edev)
 {
 	if (device_register (&edev->dev))
 		return -1;

 	device_create_file (&edev->dev, &dev_attr_signature);
 	device_create_file (&edev->dev, &dev_attr_enabled);

 	return 0;
 }

 static int __init eisa_request_resources (struct eisa_root_device *root,
 					  struct eisa_device *edev,
 					  int slot)
 {
 	int i;

 	for (i = 0; i < EISA_MAX_RESOURCES; i++) {
 		/* Don't register resource for slot 0, since this is
 		 * very likely to fail... :-( Instead, grab the EISA
 		 * id, now we can display something in /proc/ioports.
 		 */

 		/* Only one region for mainboard */
 		if (!slot && i > 0) {
 			edev->res[i].start = edev->res[i].end = 0;
 			continue;
 		}

 		if (slot) {
 			edev->res[i].name  = NULL;
 			edev->res[i].start = SLOT_ADDRESS (root, slot) + (i * 0x400);
 			edev->res[i].end   = edev->res[i].start + 0xff;
 			edev->res[i].flags = IORESOURCE_IO;
 		} else {
 			edev->res[i].name  = NULL;
 			edev->res[i].start = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET;
 			edev->res[i].end   = edev->res[i].start + 3;
 			edev->res[i].flags = IORESOURCE_BUSY;
 		}

 		if (request_resource (root->res, &edev->res[i]))
 			goto failed;
 	}

 	return 0;

  failed:
 	while (--i >= 0)
 		release_resource (&edev->res[i]);

 	return -1;
 }

 static void __init eisa_release_resources (struct eisa_device *edev)
 {
 	int i;

 	for (i = 0; i < EISA_MAX_RESOURCES; i++)
 		if (edev->res[i].start || edev->res[i].end)
 			release_resource (&edev->res[i]);
 }

 static int __init eisa_probe (struct eisa_root_device *root)
 {
         int i, c;
 	struct eisa_device *edev;

         printk (KERN_INFO "EISA: Probing bus %d at %s\n",
 		root->bus_nr, root->dev->bus_id);

 	/* First try to get hold of slot 0. If there is no device
 	 * here, simply fail, unless root->force_probe is set. */

 	if (!(edev = kmalloc (sizeof (*edev), GFP_KERNEL))) {
 		printk (KERN_ERR "EISA: Couldn't allocate mainboard slot\n");
 		return -ENOMEM;
 	}

 	memset (edev, 0, sizeof (*edev));

 	if (eisa_request_resources (root, edev, 0)) {
 		printk (KERN_WARNING \
 			"EISA: Cannot allocate resource for mainboard\n");
 		kfree (edev);
 		if (!root->force_probe)
 			return -EBUSY;
 		goto force_probe;
 	}

 	if (eisa_init_device (root, edev, 0)) {
 		eisa_release_resources (edev);
 		kfree (edev);
 		if (!root->force_probe)
 			return -ENODEV;
 		goto force_probe;
 	}

 	printk (KERN_INFO "EISA: Mainboard %s detected.\n", edev->id.sig);

 	if (eisa_register_device (edev)) {
 		printk (KERN_ERR "EISA: Failed to register %s\n",
 			edev->id.sig);
 		eisa_release_resources (edev);
 		kfree (edev);
 	}

  force_probe:

         for (c = 0, i = 1; i <= root->slots; i++) {
 		if (!(edev = kmalloc (sizeof (*edev), GFP_KERNEL))) {
 			printk (KERN_ERR "EISA: Out of memory for slot %d\n",
 				i);
 			continue;
 		}

 		memset (edev, 0, sizeof (*edev));

 		if (eisa_request_resources (root, edev, i)) {
 			printk (KERN_WARNING \
 				"Cannot allocate resource for EISA slot %d\n",
 				i);
 			kfree (edev);
 			continue;
 		}

                 if (eisa_init_device (root, edev, i)) {
 			eisa_release_resources (edev);
 			kfree (edev);
 			continue;
 		}

 		printk (KERN_INFO "EISA: slot %d : %s detected",
 			i, edev->id.sig);

 		switch (edev->state) {
 		case EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED:
 			printk (" (forced enabled)");
 			break;

 		case EISA_CONFIG_FORCED:
 			printk (" (forced disabled)");
 			break;

 		case 0:
 			printk (" (disabled)");
 			break;
 		}

 		printk (".\n");

 		c++;

 		if (eisa_register_device (edev)) {
 			printk (KERN_ERR "EISA: Failed to register %s\n",
 				edev->id.sig);
 			eisa_release_resources (edev);
 			kfree (edev);
 		}
         }

         printk (KERN_INFO "EISA: Detected %d card%s.\n", c, c == 1 ? "" : "s");

 	return 0;
 }

 static struct resource eisa_root_res = {
 	.name  = "EISA root resource",
 	.start = 0,
 	.end   = 0xffffffff,
 	.flags = IORESOURCE_IO,
 };

 static int eisa_bus_count;

 int __init eisa_root_register (struct eisa_root_device *root)
 {
 	int err;

 	/* Use our own resources to check if this bus base address has
 	 * been already registered. This prevents the virtual root
 	 * device from registering after the real one has, for
 	 * example... */

 	root->eisa_root_res.name  = eisa_root_res.name;
 	root->eisa_root_res.start = root->res->start;
 	root->eisa_root_res.end   = root->res->end;
 	root->eisa_root_res.flags = IORESOURCE_BUSY;

 	if ((err = request_resource (&eisa_root_res, &root->eisa_root_res)))
 		return err;

 	root->bus_nr = eisa_bus_count++;

 	if ((err = eisa_probe (root)))
 		release_resource (&root->eisa_root_res);

 	return err;
 }

 static int __init eisa_init (void)
 {
 	int r;

 	if ((r = bus_register (&eisa_bus_type)))
 		return r;

 	printk (KERN_INFO "EISA bus registered\n");
 	return 0;
 }

 module_param_array(enable_dev, int, &enable_dev_count, 0444);
 module_param_array(disable_dev, int, &disable_dev_count, 0444);

 postcore_initcall (eisa_init);

 int EISA_bus;		/* for legacy drivers */
 EXPORT_SYMBOL (EISA_bus);
 EXPORT_SYMBOL (eisa_bus_type);
 EXPORT_SYMBOL (eisa_driver_register);
 EXPORT_SYMBOL (eisa_driver_unregister);
	/*
	* EISA bus support functions for sysfs.
	*
	* (C) 2002, 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
	*
	* This code is released under the GPL version 2.
	*/

	#include <linux/kernel.h>
	#include <linux/device.h>
	#include <linux/eisa.h>
	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/init.h>
	#include <linux/slab.h>
	#include <linux/ioport.h>
	#include <asm/io.h>

	#define SLOT_ADDRESS(r,n) (r->bus_base_addr + (0x1000 * n))

	#define EISA_DEVINFO(i,s) { .id = { .sig = i }, .name = s }

	struct eisa_device_info {
	struct eisa_device_id id;
	char name[DEVICE_NAME_SIZE];
	};

	#ifdef CONFIG_EISA_NAMES
	static struct eisa_device_info __initdata eisa_table[] = {
	#include "devlist.h"
	};
	#define EISA_INFOS (sizeof (eisa_table) / (sizeof (struct eisa_device_info)))
	#endif

	#define EISA_MAX_FORCED_DEV 16

	static int enable_dev[EISA_MAX_FORCED_DEV];
	static int enable_dev_count;
	static int disable_dev[EISA_MAX_FORCED_DEV];
	static int disable_dev_count;

	static int is_forced_dev (int *forced_tab,
	int forced_count,
	struct eisa_root_device *root,
	struct eisa_device *edev)
	{
	int i, x;

	for (i = 0; i < forced_count; i++) {
	x = (root->bus_nr << 8) \| edev->slot;
	if (forced_tab[i] == x)
	return 1;
	}

	return 0;
	}

	static void __init eisa_name_device (struct eisa_device *edev)
	{
	#ifdef CONFIG_EISA_NAMES
	int i;
	for (i = 0; i < EISA_INFOS; i++) {
	if (!strcmp (edev->id.sig, eisa_table[i].id.sig)) {
	strlcpy (edev->pretty_name,
	eisa_table[i].name,
	DEVICE_NAME_SIZE);
	return;
	}
	}

	/* No name was found */
	sprintf (edev->pretty_name, "EISA device %.7s", edev->id.sig);
	#endif
	}

	static char __init *decode_eisa_sig(unsigned long addr)
	{
	static char sig_str[EISA_SIG_LEN];
	u8 sig[4];
	u16 rev;
	int i;

	for (i = 0; i < 4; i++) {
	#ifdef CONFIG_EISA_VLB_PRIMING
	/*
	* This ugly stuff is used to wake up VL-bus cards
	* (AHA-284x is the only known example), so we can
	* read the EISA id.
	*
	* Thankfully, this only exists on x86...
	*/
	outb(0x80 + i, addr);
	#endif
	sig[i] = inb (addr + i);

	if (!i && (sig[0] & 0x80))
	return NULL;
	}

	sig_str[0] = ((sig[0] >> 2) & 0x1f) + ('A' - 1);
	sig_str[1] = (((sig[0] & 3) << 3) \| (sig[1] >> 5)) + ('A' - 1);
	sig_str[2] = (sig[1] & 0x1f) + ('A' - 1);
	rev = (sig[2] << 8) \| sig[3];
	sprintf(sig_str + 3, "%04X", rev);

	return sig_str;
	}

	static int eisa_bus_match (struct device dev, struct device_driver drv)
	{
	struct eisa_device *edev = to_eisa_device (dev);
	struct eisa_driver *edrv = to_eisa_driver (drv);
	const struct eisa_device_id *eids = edrv->id_table;

	if (!eids)
	return 0;

	while (strlen (eids->sig)) {
	if (!strcmp (eids->sig, edev->id.sig) &&
	edev->state & EISA_CONFIG_ENABLED) {
	edev->id.driver_data = eids->driver_data;
	return 1;
	}

	eids++;
	}

	return 0;
	}

	struct bus_type eisa_bus_type = {
	.name = "eisa",
	.match = eisa_bus_match,
	};

	int eisa_driver_register (struct eisa_driver *edrv)
	{
	int r;

	edrv->driver.bus = &eisa_bus_type;
	if ((r = driver_register (&edrv->driver)) < 0)
	return r;

	return 0;
	}

	void eisa_driver_unregister (struct eisa_driver *edrv)
	{
	driver_unregister (&edrv->driver);
	}

	static ssize_t eisa_show_sig (struct device dev, struct device_attribute attr, char *buf)
	{
	struct eisa_device *edev = to_eisa_device (dev);
	return sprintf (buf,"%s\n", edev->id.sig);
	}

	static DEVICE_ATTR(signature, S_IRUGO, eisa_show_sig, NULL);

	static ssize_t eisa_show_state (struct device dev, struct device_attribute attr, char *buf)
	{
	struct eisa_device *edev = to_eisa_device (dev);
	return sprintf (buf,"%d\n", edev->state & EISA_CONFIG_ENABLED);
	}

	static DEVICE_ATTR(enabled, S_IRUGO, eisa_show_state, NULL);

	static int __init eisa_init_device (struct eisa_root_device *root,
	struct eisa_device *edev,
	int slot)
	{
	char *sig;
	unsigned long sig_addr;
	int i;

	sig_addr = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET;

	if (!(sig = decode_eisa_sig (sig_addr)))
	return -1; /* No EISA device here */

	memcpy (edev->id.sig, sig, EISA_SIG_LEN);
	edev->slot = slot;
	edev->state = inb (SLOT_ADDRESS (root, slot) + EISA_CONFIG_OFFSET) & EISA_CONFIG_ENABLED;
	edev->base_addr = SLOT_ADDRESS (root, slot);
	edev->dma_mask = root->dma_mask; /* Default DMA mask */
	eisa_name_device (edev);
	edev->dev.parent = root->dev;
	edev->dev.bus = &eisa_bus_type;
	edev->dev.dma_mask = &edev->dma_mask;
	edev->dev.coherent_dma_mask = edev->dma_mask;
	sprintf (edev->dev.bus_id, "%02X:%02X", root->bus_nr, slot);

	for (i = 0; i < EISA_MAX_RESOURCES; i++) {
	#ifdef CONFIG_EISA_NAMES
	edev->res[i].name = edev->pretty_name;
	#else
	edev->res[i].name = edev->id.sig;
	#endif
	}

	if (is_forced_dev (enable_dev, enable_dev_count, root, edev))
	edev->state = EISA_CONFIG_ENABLED \| EISA_CONFIG_FORCED;

	if (is_forced_dev (disable_dev, disable_dev_count, root, edev))
	edev->state = EISA_CONFIG_FORCED;

	return 0;
	}

	static int __init eisa_register_device (struct eisa_device *edev)
	{
	if (device_register (&edev->dev))
	return -1;

	device_create_file (&edev->dev, &dev_attr_signature);
	device_create_file (&edev->dev, &dev_attr_enabled);

	return 0;
	}

	static int __init eisa_request_resources (struct eisa_root_device *root,
	struct eisa_device *edev,
	int slot)
	{
	int i;

	for (i = 0; i < EISA_MAX_RESOURCES; i++) {
	/* Don't register resource for slot 0, since this is
	* very likely to fail... :-( Instead, grab the EISA
	* id, now we can display something in /proc/ioports.
	*/

	/* Only one region for mainboard */
	if (!slot && i > 0) {
	edev->res[i].start = edev->res[i].end = 0;
	continue;
	}

	if (slot) {
	edev->res[i].name = NULL;
	edev->res[i].start = SLOT_ADDRESS (root, slot) + (i * 0x400);
	edev->res[i].end = edev->res[i].start + 0xff;
	edev->res[i].flags = IORESOURCE_IO;
	} else {
	edev->res[i].name = NULL;
	edev->res[i].start = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET;
	edev->res[i].end = edev->res[i].start + 3;
	edev->res[i].flags = IORESOURCE_BUSY;
	}

	if (request_resource (root->res, &edev->res[i]))
	goto failed;
	}

	return 0;

	failed:
	while (--i >= 0)
	release_resource (&edev->res[i]);

	return -1;
	}

	static void __init eisa_release_resources (struct eisa_device *edev)
	{
	int i;

	for (i = 0; i < EISA_MAX_RESOURCES; i++)
	if (edev->res[i].start \|\| edev->res[i].end)
	release_resource (&edev->res[i]);
	}

	static int __init eisa_probe (struct eisa_root_device *root)
	{
	int i, c;
	struct eisa_device *edev;

	printk (KERN_INFO "EISA: Probing bus %d at %s\n",
	root->bus_nr, root->dev->bus_id);

	/* First try to get hold of slot 0. If there is no device
	* here, simply fail, unless root->force_probe is set. */

	if (!(edev = kmalloc (sizeof (*edev), GFP_KERNEL))) {
	printk (KERN_ERR "EISA: Couldn't allocate mainboard slot\n");
	return -ENOMEM;
	}

	memset (edev, 0, sizeof (*edev));

	if (eisa_request_resources (root, edev, 0)) {
	printk (KERN_WARNING \
	"EISA: Cannot allocate resource for mainboard\n");
	kfree (edev);
	if (!root->force_probe)
	return -EBUSY;
	goto force_probe;
	}

	if (eisa_init_device (root, edev, 0)) {
	eisa_release_resources (edev);
	kfree (edev);
	if (!root->force_probe)
	return -ENODEV;
	goto force_probe;
	}

	printk (KERN_INFO "EISA: Mainboard %s detected.\n", edev->id.sig);

	if (eisa_register_device (edev)) {
	printk (KERN_ERR "EISA: Failed to register %s\n",
	edev->id.sig);
	eisa_release_resources (edev);
	kfree (edev);
	}

	force_probe:

	for (c = 0, i = 1; i <= root->slots; i++) {
	if (!(edev = kmalloc (sizeof (*edev), GFP_KERNEL))) {
	printk (KERN_ERR "EISA: Out of memory for slot %d\n",
	i);
	continue;
	}

	memset (edev, 0, sizeof (*edev));

	if (eisa_request_resources (root, edev, i)) {
	printk (KERN_WARNING \
	"Cannot allocate resource for EISA slot %d\n",
	i);
	kfree (edev);
	continue;
	}

	if (eisa_init_device (root, edev, i)) {
	eisa_release_resources (edev);
	kfree (edev);
	continue;
	}

	printk (KERN_INFO "EISA: slot %d : %s detected",
	i, edev->id.sig);

	switch (edev->state) {
	case EISA_CONFIG_ENABLED \| EISA_CONFIG_FORCED:
	printk (" (forced enabled)");
	break;

	case EISA_CONFIG_FORCED:
	printk (" (forced disabled)");
	break;

	case 0:
	printk (" (disabled)");
	break;
	}

	printk (".\n");

	c++;

	if (eisa_register_device (edev)) {
	printk (KERN_ERR "EISA: Failed to register %s\n",
	edev->id.sig);
	eisa_release_resources (edev);
	kfree (edev);
	}
	}

	printk (KERN_INFO "EISA: Detected %d card%s.\n", c, c == 1 ? "" : "s");

	return 0;
	}

	static struct resource eisa_root_res = {
	.name = "EISA root resource",
	.start = 0,
	.end = 0xffffffff,
	.flags = IORESOURCE_IO,
	};

	static int eisa_bus_count;

	int __init eisa_root_register (struct eisa_root_device *root)
	{
	int err;

	/* Use our own resources to check if this bus base address has
	* been already registered. This prevents the virtual root
	* device from registering after the real one has, for
	* example... */

	root->eisa_root_res.name = eisa_root_res.name;
	root->eisa_root_res.start = root->res->start;
	root->eisa_root_res.end = root->res->end;
	root->eisa_root_res.flags = IORESOURCE_BUSY;

	if ((err = request_resource (&eisa_root_res, &root->eisa_root_res)))
	return err;

	root->bus_nr = eisa_bus_count++;

	if ((err = eisa_probe (root)))
	release_resource (&root->eisa_root_res);

	return err;
	}

	static int __init eisa_init (void)
	{
	int r;

	if ((r = bus_register (&eisa_bus_type)))
	return r;

	printk (KERN_INFO "EISA bus registered\n");
	return 0;
	}

	module_param_array(enable_dev, int, &enable_dev_count, 0444);
	module_param_array(disable_dev, int, &disable_dev_count, 0444);

	postcore_initcall (eisa_init);

	int EISA_bus; /* for legacy drivers */
	EXPORT_SYMBOL (EISA_bus);
	EXPORT_SYMBOL (eisa_bus_type);
	EXPORT_SYMBOL (eisa_driver_register);
	EXPORT_SYMBOL (eisa_driver_unregister);