drivers/pnp/card.c - kernel/msm-4.19 - Gitiles

 /*
  * card.c - contains functions for managing groups of PnP devices
  *
  * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
  */

 #include <linux/module.h>
 #include <linux/ctype.h>
 #include <linux/slab.h>
 #include <linux/pnp.h>
 #include <linux/dma-mapping.h>
 #include "base.h"

 LIST_HEAD(pnp_cards);
 static LIST_HEAD(pnp_card_drivers);

 static const struct pnp_card_device_id *match_card(struct pnp_card_driver *drv,
 						   struct pnp_card *card)
 {
 	const struct pnp_card_device_id *drv_id = drv->id_table;

 	while (*drv_id->id) {
 		if (compare_pnp_id(card->id, drv_id->id)) {
 			int i = 0;

 			for (;;) {
 				int found;
 				struct pnp_dev *dev;

 				if (i == PNP_MAX_DEVICES ||
 				    !*drv_id->devs[i].id)
 					return drv_id;
 				found = 0;
 				card_for_each_dev(card, dev) {
 					if (compare_pnp_id(dev->id,
 						   drv_id->devs[i].id)) {
 						found = 1;
 						break;
 					}
 				}
 				if (!found)
 					break;
 				i++;
 			}
 		}
 		drv_id++;
 	}
 	return NULL;
 }

 static void card_remove(struct pnp_dev *dev)
 {
 	dev->card_link = NULL;
 }

 static void card_remove_first(struct pnp_dev *dev)
 {
 	struct pnp_card_driver *drv = to_pnp_card_driver(dev->driver);

 	if (!dev->card || !drv)
 		return;
 	if (drv->remove)
 		drv->remove(dev->card_link);
 	drv->link.remove = &card_remove;
 	kfree(dev->card_link);
 	card_remove(dev);
 }

 static int card_probe(struct pnp_card *card, struct pnp_card_driver *drv)
 {
 	const struct pnp_card_device_id *id;
 	struct pnp_card_link *clink;
 	struct pnp_dev *dev;

 	if (!drv->probe)
 		return 0;
 	id = match_card(drv, card);
 	if (!id)
 		return 0;

 	clink = pnp_alloc(sizeof(*clink));
 	if (!clink)
 		return 0;
 	clink->card = card;
 	clink->driver = drv;
 	clink->pm_state = PMSG_ON;

 	if (drv->probe(clink, id) >= 0)
 		return 1;

 	/* Recovery */
 	card_for_each_dev(card, dev) {
 		if (dev->card_link == clink)
 			pnp_release_card_device(dev);
 	}
 	kfree(clink);
 	return 0;
 }

 /**
  * pnp_add_card_id - adds an EISA id to the specified card
  * @id: pointer to a pnp_id structure
  * @card: pointer to the desired card
  */
 static struct pnp_id *pnp_add_card_id(struct pnp_card *card, char *id)
 {
 	struct pnp_id *dev_id, *ptr;

 	dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 	if (!dev_id)
 		return NULL;

 	dev_id->id[0] = id[0];
 	dev_id->id[1] = id[1];
 	dev_id->id[2] = id[2];
 	dev_id->id[3] = tolower(id[3]);
 	dev_id->id[4] = tolower(id[4]);
 	dev_id->id[5] = tolower(id[5]);
 	dev_id->id[6] = tolower(id[6]);
 	dev_id->id[7] = '\0';

 	dev_id->next = NULL;
 	ptr = card->id;
 	while (ptr && ptr->next)
 		ptr = ptr->next;
 	if (ptr)
 		ptr->next = dev_id;
 	else
 		card->id = dev_id;

 	return dev_id;
 }

 static void pnp_free_card_ids(struct pnp_card *card)
 {
 	struct pnp_id *id;
 	struct pnp_id *next;

 	id = card->id;
 	while (id) {
 		next = id->next;
 		kfree(id);
 		id = next;
 	}
 }

 static void pnp_release_card(struct device *dmdev)
 {
 	struct pnp_card *card = to_pnp_card(dmdev);

 	pnp_free_card_ids(card);
 	kfree(card);
 }

 struct pnp_card *pnp_alloc_card(struct pnp_protocol *protocol, int id, char *pnpid)
 {
 	struct pnp_card *card;
 	struct pnp_id *dev_id;

 	card = kzalloc(sizeof(struct pnp_card), GFP_KERNEL);
 	if (!card)
 		return NULL;

 	card->protocol = protocol;
 	card->number = id;

 	card->dev.parent = &card->protocol->dev;
 	sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number,
 		card->number);

 	card->dev.coherent_dma_mask = DMA_24BIT_MASK;
 	card->dev.dma_mask = &card->dev.coherent_dma_mask;

 	dev_id = pnp_add_card_id(card, pnpid);
 	if (!dev_id) {
 		kfree(card);
 		return NULL;
 	}

 	return card;
 }

 static ssize_t pnp_show_card_name(struct device *dmdev,
 				  struct device_attribute *attr, char *buf)
 {
 	char *str = buf;
 	struct pnp_card *card = to_pnp_card(dmdev);

 	str += sprintf(str, "%s\n", card->name);
 	return (str - buf);
 }

 static DEVICE_ATTR(name, S_IRUGO, pnp_show_card_name, NULL);

 static ssize_t pnp_show_card_ids(struct device *dmdev,
 				 struct device_attribute *attr, char *buf)
 {
 	char *str = buf;
 	struct pnp_card *card = to_pnp_card(dmdev);
 	struct pnp_id *pos = card->id;

 	while (pos) {
 		str += sprintf(str, "%s\n", pos->id);
 		pos = pos->next;
 	}
 	return (str - buf);
 }

 static DEVICE_ATTR(card_id, S_IRUGO, pnp_show_card_ids, NULL);

 static int pnp_interface_attach_card(struct pnp_card *card)
 {
 	int rc = device_create_file(&card->dev, &dev_attr_name);

 	if (rc)
 		return rc;

 	rc = device_create_file(&card->dev, &dev_attr_card_id);
 	if (rc)
 		goto err_name;

 	return 0;

 err_name:
 	device_remove_file(&card->dev, &dev_attr_name);
 	return rc;
 }

 /**
  * pnp_add_card - adds a PnP card to the PnP Layer
  * @card: pointer to the card to add
  */
 int pnp_add_card(struct pnp_card *card)
 {
 	int error;
 	struct list_head *pos, *temp;

 	card->dev.bus = NULL;
 	card->dev.release = &pnp_release_card;
 	error = device_register(&card->dev);
 	if (error) {
 		dev_err(&card->dev, "could not register (err=%d)\n", error);
 		return error;
 	}

 	pnp_interface_attach_card(card);
 	spin_lock(&pnp_lock);
 	list_add_tail(&card->global_list, &pnp_cards);
 	list_add_tail(&card->protocol_list, &card->protocol->cards);
 	spin_unlock(&pnp_lock);

 	/* we wait until now to add devices in order to ensure the drivers
 	 * will be able to use all of the related devices on the card
 	 * without waiting an unreasonable length of time */
 	list_for_each(pos, &card->devices) {
 		struct pnp_dev *dev = card_to_pnp_dev(pos);
 		__pnp_add_device(dev);
 	}

 	/* match with card drivers */
 	list_for_each_safe(pos, temp, &pnp_card_drivers) {
 		struct pnp_card_driver *drv =
 		    list_entry(pos, struct pnp_card_driver,
 			       global_list);
 		card_probe(card, drv);
 	}
 	return 0;
 }

 /**
  * pnp_remove_card - removes a PnP card from the PnP Layer
  * @card: pointer to the card to remove
  */
 void pnp_remove_card(struct pnp_card *card)
 {
 	struct list_head *pos, *temp;

 	device_unregister(&card->dev);
 	spin_lock(&pnp_lock);
 	list_del(&card->global_list);
 	list_del(&card->protocol_list);
 	spin_unlock(&pnp_lock);
 	list_for_each_safe(pos, temp, &card->devices) {
 		struct pnp_dev *dev = card_to_pnp_dev(pos);
 		pnp_remove_card_device(dev);
 	}
 }

 /**
  * pnp_add_card_device - adds a device to the specified card
  * @card: pointer to the card to add to
  * @dev: pointer to the device to add
  */
 int pnp_add_card_device(struct pnp_card *card, struct pnp_dev *dev)
 {
 	dev->dev.parent = &card->dev;
 	dev->card_link = NULL;
 	snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x",
 		 dev->protocol->number, card->number, dev->number);
 	spin_lock(&pnp_lock);
 	dev->card = card;
 	list_add_tail(&dev->card_list, &card->devices);
 	spin_unlock(&pnp_lock);
 	return 0;
 }

 /**
  * pnp_remove_card_device- removes a device from the specified card
  * @dev: pointer to the device to remove
  */
 void pnp_remove_card_device(struct pnp_dev *dev)
 {
 	spin_lock(&pnp_lock);
 	dev->card = NULL;
 	list_del(&dev->card_list);
 	spin_unlock(&pnp_lock);
 	__pnp_remove_device(dev);
 }

 /**
  * pnp_request_card_device - Searches for a PnP device under the specified card
  * @clink: pointer to the card link, cannot be NULL
  * @id: pointer to a PnP ID structure that explains the rules for finding the device
  * @from: Starting place to search from. If NULL it will start from the begining.
  */
 struct pnp_dev *pnp_request_card_device(struct pnp_card_link *clink,
 					const char *id, struct pnp_dev *from)
 {
 	struct list_head *pos;
 	struct pnp_dev *dev;
 	struct pnp_card_driver *drv;
 	struct pnp_card *card;

 	if (!clink || !id)
 		return NULL;

 	card = clink->card;
 	drv = clink->driver;
 	if (!from) {
 		pos = card->devices.next;
 	} else {
 		if (from->card != card)
 			return NULL;
 		pos = from->card_list.next;
 	}
 	while (pos != &card->devices) {
 		dev = card_to_pnp_dev(pos);
 		if ((!dev->card_link) && compare_pnp_id(dev->id, id))
 			goto found;
 		pos = pos->next;
 	}

 	return NULL;

 found:
 	dev->card_link = clink;
 	dev->dev.driver = &drv->link.driver;
 	if (pnp_bus_type.probe(&dev->dev))
 		goto err_out;
 	if (device_bind_driver(&dev->dev))
 		goto err_out;

 	return dev;

 err_out:
 	dev->dev.driver = NULL;
 	dev->card_link = NULL;
 	return NULL;
 }

 /**
  * pnp_release_card_device - call this when the driver no longer needs the device
  * @dev: pointer to the PnP device stucture
  */
 void pnp_release_card_device(struct pnp_dev *dev)
 {
 	struct pnp_card_driver *drv = dev->card_link->driver;

 	drv->link.remove = &card_remove;
 	device_release_driver(&dev->dev);
 	drv->link.remove = &card_remove_first;
 }

 /*
  * suspend/resume callbacks
  */
 static int card_suspend(struct pnp_dev *dev, pm_message_t state)
 {
 	struct pnp_card_link *link = dev->card_link;

 	if (link->pm_state.event == state.event)
 		return 0;
 	link->pm_state = state;
 	return link->driver->suspend(link, state);
 }

 static int card_resume(struct pnp_dev *dev)
 {
 	struct pnp_card_link *link = dev->card_link;

 	if (link->pm_state.event == PM_EVENT_ON)
 		return 0;
 	link->pm_state = PMSG_ON;
 	link->driver->resume(link);
 	return 0;
 }

 /**
  * pnp_register_card_driver - registers a PnP card driver with the PnP Layer
  * @drv: pointer to the driver to register
  */
 int pnp_register_card_driver(struct pnp_card_driver *drv)
 {
 	int error;
 	struct list_head *pos, *temp;

 	drv->link.name = drv->name;
 	drv->link.id_table = NULL;	/* this will disable auto matching */
 	drv->link.flags = drv->flags;
 	drv->link.probe = NULL;
 	drv->link.remove = &card_remove_first;
 	drv->link.suspend = drv->suspend ? card_suspend : NULL;
 	drv->link.resume = drv->resume ? card_resume : NULL;

 	error = pnp_register_driver(&drv->link);
 	if (error < 0)
 		return error;

 	spin_lock(&pnp_lock);
 	list_add_tail(&drv->global_list, &pnp_card_drivers);
 	spin_unlock(&pnp_lock);

 	list_for_each_safe(pos, temp, &pnp_cards) {
 		struct pnp_card *card =
 		    list_entry(pos, struct pnp_card, global_list);
 		card_probe(card, drv);
 	}
 	return 0;
 }

 /**
  * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
  * @drv: pointer to the driver to unregister
  */
 void pnp_unregister_card_driver(struct pnp_card_driver *drv)
 {
 	spin_lock(&pnp_lock);
 	list_del(&drv->global_list);
 	spin_unlock(&pnp_lock);
 	pnp_unregister_driver(&drv->link);
 }

 EXPORT_SYMBOL(pnp_request_card_device);
 EXPORT_SYMBOL(pnp_release_card_device);
 EXPORT_SYMBOL(pnp_register_card_driver);
 EXPORT_SYMBOL(pnp_unregister_card_driver);
	/*
	* card.c - contains functions for managing groups of PnP devices
	*
	* Copyright 2002 Adam Belay <ambx1@neo.rr.com>
	*/

	#include <linux/module.h>
	#include <linux/ctype.h>
	#include <linux/slab.h>
	#include <linux/pnp.h>
	#include <linux/dma-mapping.h>
	#include "base.h"

	LIST_HEAD(pnp_cards);
	static LIST_HEAD(pnp_card_drivers);

	static const struct pnp_card_device_id match_card(struct pnp_card_driver drv,
	struct pnp_card *card)
	{
	const struct pnp_card_device_id *drv_id = drv->id_table;

	while (*drv_id->id) {
	if (compare_pnp_id(card->id, drv_id->id)) {
	int i = 0;

	for (;;) {
	int found;
	struct pnp_dev *dev;

	if (i == PNP_MAX_DEVICES \|\|
	!*drv_id->devs[i].id)
	return drv_id;
	found = 0;
	card_for_each_dev(card, dev) {
	if (compare_pnp_id(dev->id,
	drv_id->devs[i].id)) {
	found = 1;
	break;
	}
	}
	if (!found)
	break;
	i++;
	}
	}
	drv_id++;
	}
	return NULL;
	}

	static void card_remove(struct pnp_dev *dev)
	{
	dev->card_link = NULL;
	}

	static void card_remove_first(struct pnp_dev *dev)
	{
	struct pnp_card_driver *drv = to_pnp_card_driver(dev->driver);

	if (!dev->card \|\| !drv)
	return;
	if (drv->remove)
	drv->remove(dev->card_link);
	drv->link.remove = &card_remove;
	kfree(dev->card_link);
	card_remove(dev);
	}

	static int card_probe(struct pnp_card card, struct pnp_card_driver drv)
	{
	const struct pnp_card_device_id *id;
	struct pnp_card_link *clink;
	struct pnp_dev *dev;

	if (!drv->probe)
	return 0;
	id = match_card(drv, card);
	if (!id)
	return 0;

	clink = pnp_alloc(sizeof(*clink));
	if (!clink)
	return 0;
	clink->card = card;
	clink->driver = drv;
	clink->pm_state = PMSG_ON;

	if (drv->probe(clink, id) >= 0)
	return 1;

	/* Recovery */
	card_for_each_dev(card, dev) {
	if (dev->card_link == clink)
	pnp_release_card_device(dev);
	}
	kfree(clink);
	return 0;
	}

	/**
	* pnp_add_card_id - adds an EISA id to the specified card
	* @id: pointer to a pnp_id structure
	* @card: pointer to the desired card
	*/
	static struct pnp_id pnp_add_card_id(struct pnp_card card, char *id)
	{
	struct pnp_id dev_id, ptr;

	dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
	if (!dev_id)
	return NULL;

	dev_id->id[0] = id[0];
	dev_id->id[1] = id[1];
	dev_id->id[2] = id[2];
	dev_id->id[3] = tolower(id[3]);
	dev_id->id[4] = tolower(id[4]);
	dev_id->id[5] = tolower(id[5]);
	dev_id->id[6] = tolower(id[6]);
	dev_id->id[7] = '\0';

	dev_id->next = NULL;
	ptr = card->id;
	while (ptr && ptr->next)
	ptr = ptr->next;
	if (ptr)
	ptr->next = dev_id;
	else
	card->id = dev_id;

	return dev_id;
	}

	static void pnp_free_card_ids(struct pnp_card *card)
	{
	struct pnp_id *id;
	struct pnp_id *next;

	id = card->id;
	while (id) {
	next = id->next;
	kfree(id);
	id = next;
	}
	}

	static void pnp_release_card(struct device *dmdev)
	{
	struct pnp_card *card = to_pnp_card(dmdev);

	pnp_free_card_ids(card);
	kfree(card);
	}

	struct pnp_card pnp_alloc_card(struct pnp_protocol protocol, int id, char *pnpid)
	{
	struct pnp_card *card;
	struct pnp_id *dev_id;

	card = kzalloc(sizeof(struct pnp_card), GFP_KERNEL);
	if (!card)
	return NULL;

	card->protocol = protocol;
	card->number = id;

	card->dev.parent = &card->protocol->dev;
	sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number,
	card->number);

	card->dev.coherent_dma_mask = DMA_24BIT_MASK;
	card->dev.dma_mask = &card->dev.coherent_dma_mask;

	dev_id = pnp_add_card_id(card, pnpid);
	if (!dev_id) {
	kfree(card);
	return NULL;
	}

	return card;
	}

	static ssize_t pnp_show_card_name(struct device *dmdev,
	struct device_attribute attr, char buf)
	{
	char *str = buf;
	struct pnp_card *card = to_pnp_card(dmdev);

	str += sprintf(str, "%s\n", card->name);
	return (str - buf);
	}

	static DEVICE_ATTR(name, S_IRUGO, pnp_show_card_name, NULL);

	static ssize_t pnp_show_card_ids(struct device *dmdev,
	struct device_attribute attr, char buf)
	{
	char *str = buf;
	struct pnp_card *card = to_pnp_card(dmdev);
	struct pnp_id *pos = card->id;

	while (pos) {
	str += sprintf(str, "%s\n", pos->id);
	pos = pos->next;
	}
	return (str - buf);
	}

	static DEVICE_ATTR(card_id, S_IRUGO, pnp_show_card_ids, NULL);

	static int pnp_interface_attach_card(struct pnp_card *card)
	{
	int rc = device_create_file(&card->dev, &dev_attr_name);

	if (rc)
	return rc;

	rc = device_create_file(&card->dev, &dev_attr_card_id);
	if (rc)
	goto err_name;

	return 0;

	err_name:
	device_remove_file(&card->dev, &dev_attr_name);
	return rc;
	}

	/**
	* pnp_add_card - adds a PnP card to the PnP Layer
	* @card: pointer to the card to add
	*/
	int pnp_add_card(struct pnp_card *card)
	{
	int error;
	struct list_head pos, temp;

	card->dev.bus = NULL;
	card->dev.release = &pnp_release_card;
	error = device_register(&card->dev);
	if (error) {
	dev_err(&card->dev, "could not register (err=%d)\n", error);
	return error;
	}

	pnp_interface_attach_card(card);
	spin_lock(&pnp_lock);
	list_add_tail(&card->global_list, &pnp_cards);
	list_add_tail(&card->protocol_list, &card->protocol->cards);
	spin_unlock(&pnp_lock);

	/* we wait until now to add devices in order to ensure the drivers
	* will be able to use all of the related devices on the card
	* without waiting an unreasonable length of time */
	list_for_each(pos, &card->devices) {
	struct pnp_dev *dev = card_to_pnp_dev(pos);
	__pnp_add_device(dev);
	}

	/* match with card drivers */
	list_for_each_safe(pos, temp, &pnp_card_drivers) {
	struct pnp_card_driver *drv =
	list_entry(pos, struct pnp_card_driver,
	global_list);
	card_probe(card, drv);
	}
	return 0;
	}

	/**
	* pnp_remove_card - removes a PnP card from the PnP Layer
	* @card: pointer to the card to remove
	*/
	void pnp_remove_card(struct pnp_card *card)
	{
	struct list_head pos, temp;

	device_unregister(&card->dev);
	spin_lock(&pnp_lock);
	list_del(&card->global_list);
	list_del(&card->protocol_list);
	spin_unlock(&pnp_lock);
	list_for_each_safe(pos, temp, &card->devices) {
	struct pnp_dev *dev = card_to_pnp_dev(pos);
	pnp_remove_card_device(dev);
	}
	}

	/**
	* pnp_add_card_device - adds a device to the specified card
	* @card: pointer to the card to add to
	* @dev: pointer to the device to add
	*/
	int pnp_add_card_device(struct pnp_card card, struct pnp_dev dev)
	{
	dev->dev.parent = &card->dev;
	dev->card_link = NULL;
	snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x",
	dev->protocol->number, card->number, dev->number);
	spin_lock(&pnp_lock);
	dev->card = card;
	list_add_tail(&dev->card_list, &card->devices);
	spin_unlock(&pnp_lock);
	return 0;
	}

	/**
	* pnp_remove_card_device- removes a device from the specified card
	* @dev: pointer to the device to remove
	*/
	void pnp_remove_card_device(struct pnp_dev *dev)
	{
	spin_lock(&pnp_lock);
	dev->card = NULL;
	list_del(&dev->card_list);
	spin_unlock(&pnp_lock);
	__pnp_remove_device(dev);
	}

	/**
	* pnp_request_card_device - Searches for a PnP device under the specified card
	* @clink: pointer to the card link, cannot be NULL
	* @id: pointer to a PnP ID structure that explains the rules for finding the device
	* @from: Starting place to search from. If NULL it will start from the begining.
	*/
	struct pnp_dev pnp_request_card_device(struct pnp_card_link clink,
	const char id, struct pnp_dev from)
	{
	struct list_head *pos;
	struct pnp_dev *dev;
	struct pnp_card_driver *drv;
	struct pnp_card *card;

	if (!clink \|\| !id)
	return NULL;

	card = clink->card;
	drv = clink->driver;
	if (!from) {
	pos = card->devices.next;
	} else {
	if (from->card != card)
	return NULL;
	pos = from->card_list.next;
	}
	while (pos != &card->devices) {
	dev = card_to_pnp_dev(pos);
	if ((!dev->card_link) && compare_pnp_id(dev->id, id))
	goto found;
	pos = pos->next;
	}

	return NULL;

	found:
	dev->card_link = clink;
	dev->dev.driver = &drv->link.driver;
	if (pnp_bus_type.probe(&dev->dev))
	goto err_out;
	if (device_bind_driver(&dev->dev))
	goto err_out;

	return dev;

	err_out:
	dev->dev.driver = NULL;
	dev->card_link = NULL;
	return NULL;
	}

	/**
	* pnp_release_card_device - call this when the driver no longer needs the device
	* @dev: pointer to the PnP device stucture
	*/
	void pnp_release_card_device(struct pnp_dev *dev)
	{
	struct pnp_card_driver *drv = dev->card_link->driver;

	drv->link.remove = &card_remove;
	device_release_driver(&dev->dev);
	drv->link.remove = &card_remove_first;
	}

	/*
	* suspend/resume callbacks
	*/
	static int card_suspend(struct pnp_dev *dev, pm_message_t state)
	{
	struct pnp_card_link *link = dev->card_link;

	if (link->pm_state.event == state.event)
	return 0;
	link->pm_state = state;
	return link->driver->suspend(link, state);
	}

	static int card_resume(struct pnp_dev *dev)
	{
	struct pnp_card_link *link = dev->card_link;

	if (link->pm_state.event == PM_EVENT_ON)
	return 0;
	link->pm_state = PMSG_ON;
	link->driver->resume(link);
	return 0;
	}

	/**
	* pnp_register_card_driver - registers a PnP card driver with the PnP Layer
	* @drv: pointer to the driver to register
	*/
	int pnp_register_card_driver(struct pnp_card_driver *drv)
	{
	int error;
	struct list_head pos, temp;

	drv->link.name = drv->name;
	drv->link.id_table = NULL; /* this will disable auto matching */
	drv->link.flags = drv->flags;
	drv->link.probe = NULL;
	drv->link.remove = &card_remove_first;
	drv->link.suspend = drv->suspend ? card_suspend : NULL;
	drv->link.resume = drv->resume ? card_resume : NULL;

	error = pnp_register_driver(&drv->link);
	if (error < 0)
	return error;

	spin_lock(&pnp_lock);
	list_add_tail(&drv->global_list, &pnp_card_drivers);
	spin_unlock(&pnp_lock);

	list_for_each_safe(pos, temp, &pnp_cards) {
	struct pnp_card *card =
	list_entry(pos, struct pnp_card, global_list);
	card_probe(card, drv);
	}
	return 0;
	}

	/**
	* pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
	* @drv: pointer to the driver to unregister
	*/
	void pnp_unregister_card_driver(struct pnp_card_driver *drv)
	{
	spin_lock(&pnp_lock);
	list_del(&drv->global_list);
	spin_unlock(&pnp_lock);
	pnp_unregister_driver(&drv->link);
	}

	EXPORT_SYMBOL(pnp_request_card_device);
	EXPORT_SYMBOL(pnp_release_card_device);
	EXPORT_SYMBOL(pnp_register_card_driver);
	EXPORT_SYMBOL(pnp_unregister_card_driver);