[deliverable/linux.git] / drivers / pnp / card.c

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

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pnp.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
 */
int pnp_add_card_id(struct pnp_id *id, struct pnp_card *card)
{
	struct pnp_id *ptr;

	if (!id)
		return -EINVAL;
	if (!card)
		return -EINVAL;
	id->next = NULL;
	ptr = card->id;
	while (ptr && ptr->next)
		ptr = ptr->next;
	if (ptr)
		ptr->next = id;
	else
		card->id = id;
	return 0;
}

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

	if (!card)
		return;
	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);
}

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;

	if (!card || !card->protocol)
		return -EINVAL;

	sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number,
		card->number);
	card->dev.parent = &card->protocol->dev;
	card->dev.bus = NULL;
	card->dev.release = &pnp_release_card;
	error = device_register(&card->dev);

	if (error == 0) {
		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 any unresonable 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);
		}
	} else
		pnp_err("sysfs failure, card '%s' will be unavailable",
			card->dev.bus_id);
	return error;
}

/**
 * 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;

	if (!card)
		return;
	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)
{
	if (!card || !dev || !dev->protocol)
		return -EINVAL;
	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)
		goto done;
	card = clink->card;
	drv = clink->driver;
	if (!from) {
		pos = card->devices.next;
	} else {
		if (from->card != card)
			goto done;
		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;
	}

done:
	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;

	if (!drv)
		return;
	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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* card.c - contains functions for managing groups of PnP devices
	3	*
	4	* Copyright 2002 Adam Belay <ambx1@neo.rr.com>
1da177e4 LT	5	*/
1da177e4 LT	6
1da177e4 LT	7	#include <linux/module.h>
1da177e4 LT	8	#include <linux/slab.h>
1da177e4 LT	9	#include <linux/pnp.h>
	10	#include "base.h"
	11
	12	LIST_HEAD(pnp_cards);
b449f63c	13	static LIST_HEAD(pnp_card_drivers);
1da177e4	14
9dd78466 BH	15	static const struct pnp_card_device_id match_card(struct pnp_card_driver drv,
9dd78466 BH	16	struct pnp_card *card)
1da177e4	17	{
9dd78466	18	const struct pnp_card_device_id *drv_id = drv->id_table;
07d4e9af	19
9dd78466 BH	20	while (*drv_id->id) {
9dd78466 BH	21	if (compare_pnp_id(card->id, drv_id->id)) {
1da177e4	22	int i = 0;
07d4e9af	23
1da177e4 LT	24	for (;;) {
	25	int found;
	26	struct pnp_dev *dev;
07d4e9af	27
1e0aa9ad BH	28	if (i == PNP_MAX_DEVICES \|\|
1e0aa9ad BH	29	!*drv_id->devs[i].id)
1da177e4 LT	30	return drv_id;
	31	found = 0;
	32	card_for_each_dev(card, dev) {
1e0aa9ad BH	33	if (compare_pnp_id(dev->id,
1e0aa9ad BH	34	drv_id->devs[i].id)) {
1da177e4 LT	35	found = 1;
	36	break;
	37	}
	38	}
9dd78466	39	if (!found)
1da177e4 LT	40	break;
	41	i++;
	42	}
	43	}
	44	drv_id++;
	45	}
	46	return NULL;
	47	}
	48
9dd78466	49	static void card_remove(struct pnp_dev *dev)
1da177e4 LT	50	{
	51	dev->card_link = NULL;
	52	}
982c6094	53
9dd78466	54	static void card_remove_first(struct pnp_dev *dev)
1da177e4	55	{
9dd78466	56	struct pnp_card_driver *drv = to_pnp_card_driver(dev->driver);
07d4e9af	57
1da177e4 LT	58	if (!dev->card \|\| !drv)
	59	return;
	60	if (drv->remove)
	61	drv->remove(dev->card_link);
	62	drv->link.remove = &card_remove;
	63	kfree(dev->card_link);
	64	card_remove(dev);
	65	}
	66
a9adb8db	67	static int card_probe(struct pnp_card card, struct pnp_card_driver drv)
1da177e4	68	{
a9adb8db JJ	69	const struct pnp_card_device_id *id;
	70	struct pnp_card_link *clink;
	71	struct pnp_dev *dev;
	72
	73	if (!drv->probe)
	74	return 0;
9dd78466	75	id = match_card(drv, card);
a9adb8db JJ	76	if (!id)
	77	return 0;
	78
	79	clink = pnp_alloc(sizeof(*clink));
	80	if (!clink)
	81	return 0;
	82	clink->card = card;
	83	clink->driver = drv;
	84	clink->pm_state = PMSG_ON;
	85
	86	if (drv->probe(clink, id) >= 0)
	87	return 1;
	88
	89	/* Recovery */
	90	card_for_each_dev(card, dev) {
	91	if (dev->card_link == clink)
	92	pnp_release_card_device(dev);
1da177e4	93	}
a9adb8db	94	kfree(clink);
1da177e4 LT	95	return 0;
	96	}
	97
	98	/**
	99	* pnp_add_card_id - adds an EISA id to the specified card
	100	* @id: pointer to a pnp_id structure
	101	* @card: pointer to the desired card
1da177e4	102	*/
9dd78466	103	int pnp_add_card_id(struct pnp_id id, struct pnp_card card)
1da177e4	104	{
9dd78466	105	struct pnp_id *ptr;
07d4e9af	106
1da177e4 LT	107	if (!id)
	108	return -EINVAL;
	109	if (!card)
	110	return -EINVAL;
	111	id->next = NULL;
	112	ptr = card->id;
	113	while (ptr && ptr->next)
	114	ptr = ptr->next;
	115	if (ptr)
	116	ptr->next = id;
	117	else
	118	card->id = id;
	119	return 0;
	120	}
	121
9dd78466	122	static void pnp_free_card_ids(struct pnp_card *card)
1da177e4	123	{
9dd78466	124	struct pnp_id *id;
1da177e4	125	struct pnp_id *next;
07d4e9af	126
1da177e4 LT	127	if (!card)
	128	return;
	129	id = card->id;
	130	while (id) {
	131	next = id->next;
	132	kfree(id);
	133	id = next;
	134	}
	135	}
	136
	137	static void pnp_release_card(struct device *dmdev)
	138	{
9dd78466	139	struct pnp_card *card = to_pnp_card(dmdev);
07d4e9af	140
1da177e4 LT	141	pnp_free_card_ids(card);
	142	kfree(card);
	143	}
	144
9dd78466 BH	145	static ssize_t pnp_show_card_name(struct device *dmdev,
9dd78466 BH	146	struct device_attribute attr, char buf)
1da177e4 LT	147	{
	148	char *str = buf;
	149	struct pnp_card *card = to_pnp_card(dmdev);
07d4e9af	150
9dd78466	151	str += sprintf(str, "%s\n", card->name);
1da177e4 LT	152	return (str - buf);
	153	}
	154
9dd78466	155	static DEVICE_ATTR(name, S_IRUGO, pnp_show_card_name, NULL);
1da177e4	156
9dd78466 BH	157	static ssize_t pnp_show_card_ids(struct device *dmdev,
9dd78466 BH	158	struct device_attribute attr, char buf)
1da177e4 LT	159	{
	160	char *str = buf;
	161	struct pnp_card *card = to_pnp_card(dmdev);
9dd78466	162	struct pnp_id *pos = card->id;
1da177e4 LT	163
1da177e4 LT	164	while (pos) {
9dd78466	165	str += sprintf(str, "%s\n", pos->id);
1da177e4 LT	166	pos = pos->next;
	167	}
	168	return (str - buf);
	169	}
	170
9dd78466	171	static DEVICE_ATTR(card_id, S_IRUGO, pnp_show_card_ids, NULL);
1da177e4 LT	172
	173	static int pnp_interface_attach_card(struct pnp_card *card)
	174	{
9dd78466	175	int rc = device_create_file(&card->dev, &dev_attr_name);
07d4e9af	176
9dd78466 BH	177	if (rc)
9dd78466 BH	178	return rc;
bfc7ee20	179
9dd78466 BH	180	rc = device_create_file(&card->dev, &dev_attr_card_id);
	181	if (rc)
	182	goto err_name;
bfc7ee20	183
1da177e4	184	return 0;
bfc7ee20	185
1e0aa9ad	186	err_name:
9dd78466	187	device_remove_file(&card->dev, &dev_attr_name);
bfc7ee20	188	return rc;
1da177e4 LT	189	}
	190
	191	/**
	192	* pnp_add_card - adds a PnP card to the PnP Layer
	193	* @card: pointer to the card to add
	194	*/
9dd78466	195	int pnp_add_card(struct pnp_card *card)
1da177e4 LT	196	{
1da177e4 LT	197	int error;
9dd78466	198	struct list_head pos, temp;
07d4e9af	199
1da177e4 LT	200	if (!card \|\| !card->protocol)
	201	return -EINVAL;
	202
9dd78466 BH	203	sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number,
9dd78466 BH	204	card->number);
1da177e4 LT	205	card->dev.parent = &card->protocol->dev;
	206	card->dev.bus = NULL;
	207	card->dev.release = &pnp_release_card;
	208	error = device_register(&card->dev);
	209
	210	if (error == 0) {
	211	pnp_interface_attach_card(card);
	212	spin_lock(&pnp_lock);
	213	list_add_tail(&card->global_list, &pnp_cards);
	214	list_add_tail(&card->protocol_list, &card->protocol->cards);
	215	spin_unlock(&pnp_lock);
	216
	217	/* we wait until now to add devices in order to ensure the drivers
	218	* will be able to use all of the related devices on the card
	219	* without waiting any unresonable length of time */
9dd78466	220	list_for_each(pos, &card->devices) {
1da177e4 LT	221	struct pnp_dev *dev = card_to_pnp_dev(pos);
	222	__pnp_add_device(dev);
	223	}
	224
	225	/* match with card drivers */
9dd78466 BH	226	list_for_each_safe(pos, temp, &pnp_card_drivers) {
	227	struct pnp_card_driver *drv =
	228	list_entry(pos, struct pnp_card_driver,
	229	global_list);
	230	card_probe(card, drv);
1da177e4 LT	231	}
1da177e4 LT	232	} else
9dd78466 BH	233	pnp_err("sysfs failure, card '%s' will be unavailable",
9dd78466 BH	234	card->dev.bus_id);
1da177e4 LT	235	return error;
	236	}
	237
	238	/**
	239	* pnp_remove_card - removes a PnP card from the PnP Layer
	240	* @card: pointer to the card to remove
	241	*/
9dd78466	242	void pnp_remove_card(struct pnp_card *card)
1da177e4 LT	243	{
1da177e4 LT	244	struct list_head pos, temp;
07d4e9af	245
1da177e4 LT	246	if (!card)
	247	return;
	248	device_unregister(&card->dev);
	249	spin_lock(&pnp_lock);
	250	list_del(&card->global_list);
	251	list_del(&card->protocol_list);
	252	spin_unlock(&pnp_lock);
9dd78466	253	list_for_each_safe(pos, temp, &card->devices) {
1da177e4 LT	254	struct pnp_dev *dev = card_to_pnp_dev(pos);
	255	pnp_remove_card_device(dev);
	256	}
	257	}
	258
	259	/**
	260	* pnp_add_card_device - adds a device to the specified card
	261	* @card: pointer to the card to add to
	262	* @dev: pointer to the device to add
	263	*/
9dd78466	264	int pnp_add_card_device(struct pnp_card card, struct pnp_dev dev)
1da177e4 LT	265	{
	266	if (!card \|\| !dev \|\| !dev->protocol)
	267	return -EINVAL;
	268	dev->dev.parent = &card->dev;
	269	dev->card_link = NULL;
9dd78466 BH	270	snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x",
9dd78466 BH	271	dev->protocol->number, card->number, dev->number);
1da177e4 LT	272	spin_lock(&pnp_lock);
	273	dev->card = card;
	274	list_add_tail(&dev->card_list, &card->devices);
	275	spin_unlock(&pnp_lock);
	276	return 0;
	277	}
	278
	279	/**
	280	* pnp_remove_card_device- removes a device from the specified card
1da177e4 LT	281	* @dev: pointer to the device to remove
1da177e4 LT	282	*/
9dd78466	283	void pnp_remove_card_device(struct pnp_dev *dev)
1da177e4 LT	284	{
	285	spin_lock(&pnp_lock);
	286	dev->card = NULL;
	287	list_del(&dev->card_list);
	288	spin_unlock(&pnp_lock);
	289	__pnp_remove_device(dev);
	290	}
	291
	292	/**
	293	* pnp_request_card_device - Searches for a PnP device under the specified card
3d41088f	294	* @clink: pointer to the card link, cannot be NULL
1da177e4 LT	295	* @id: pointer to a PnP ID structure that explains the rules for finding the device
	296	* @from: Starting place to search from. If NULL it will start from the begining.
	297	*/
9dd78466 BH	298	struct pnp_dev pnp_request_card_device(struct pnp_card_link clink,
9dd78466 BH	299	const char id, struct pnp_dev from)
1da177e4	300	{
9dd78466 BH	301	struct list_head *pos;
	302	struct pnp_dev *dev;
	303	struct pnp_card_driver *drv;
	304	struct pnp_card *card;
07d4e9af	305
1da177e4 LT	306	if (!clink \|\| !id)
	307	goto done;
	308	card = clink->card;
	309	drv = clink->driver;
	310	if (!from) {
	311	pos = card->devices.next;
	312	} else {
	313	if (from->card != card)
	314	goto done;
	315	pos = from->card_list.next;
	316	}
	317	while (pos != &card->devices) {
	318	dev = card_to_pnp_dev(pos);
9dd78466	319	if ((!dev->card_link) && compare_pnp_id(dev->id, id))
1da177e4 LT	320	goto found;
	321	pos = pos->next;
	322	}
	323
1e0aa9ad	324	done:
1da177e4 LT	325	return NULL;
1da177e4 LT	326
1e0aa9ad	327	found:
1da177e4 LT	328	dev->card_link = clink;
1da177e4 LT	329	dev->dev.driver = &drv->link.driver;
bfc7ee20 JG	330	if (pnp_bus_type.probe(&dev->dev))
	331	goto err_out;
	332	if (device_bind_driver(&dev->dev))
	333	goto err_out;
	334
1da177e4	335	return dev;
bfc7ee20	336
1e0aa9ad	337	err_out:
bfc7ee20 JG	338	dev->dev.driver = NULL;
bfc7ee20 JG	339	dev->card_link = NULL;
bfc7ee20	340	return NULL;
1da177e4 LT	341	}
	342
	343	/**
	344	* pnp_release_card_device - call this when the driver no longer needs the device
	345	* @dev: pointer to the PnP device stucture
	346	*/
9dd78466	347	void pnp_release_card_device(struct pnp_dev *dev)
1da177e4	348	{
9dd78466	349	struct pnp_card_driver *drv = dev->card_link->driver;
07d4e9af	350
1da177e4 LT	351	if (!drv)
1da177e4 LT	352	return;
1da177e4 LT	353	drv->link.remove = &card_remove;
	354	device_release_driver(&dev->dev);
	355	drv->link.remove = &card_remove_first;
1da177e4 LT	356	}
1da177e4 LT	357
4c98cfef TI	358	/*
	359	* suspend/resume callbacks
	360	*/
	361	static int card_suspend(struct pnp_dev *dev, pm_message_t state)
	362	{
	363	struct pnp_card_link *link = dev->card_link;
07d4e9af	364
4c98cfef TI	365	if (link->pm_state.event == state.event)
	366	return 0;
	367	link->pm_state = state;
	368	return link->driver->suspend(link, state);
	369	}
	370
	371	static int card_resume(struct pnp_dev *dev)
	372	{
	373	struct pnp_card_link *link = dev->card_link;
07d4e9af	374
4c98cfef TI	375	if (link->pm_state.event == PM_EVENT_ON)
	376	return 0;
	377	link->pm_state = PMSG_ON;
	378	link->driver->resume(link);
	379	return 0;
	380	}
	381
1da177e4 LT	382	/**
	383	* pnp_register_card_driver - registers a PnP card driver with the PnP Layer
	384	* @drv: pointer to the driver to register
	385	*/
9dd78466	386	int pnp_register_card_driver(struct pnp_card_driver *drv)
1da177e4	387	{
982c6094	388	int error;
1da177e4 LT	389	struct list_head pos, temp;
	390
	391	drv->link.name = drv->name;
	392	drv->link.id_table = NULL; /* this will disable auto matching */
	393	drv->link.flags = drv->flags;
	394	drv->link.probe = NULL;
	395	drv->link.remove = &card_remove_first;
4c98cfef TI	396	drv->link.suspend = drv->suspend ? card_suspend : NULL;
4c98cfef TI	397	drv->link.resume = drv->resume ? card_resume : NULL;
1da177e4	398
982c6094 BH	399	error = pnp_register_driver(&drv->link);
	400	if (error < 0)
	401	return error;
d1d051b2	402
1da177e4 LT	403	spin_lock(&pnp_lock);
	404	list_add_tail(&drv->global_list, &pnp_card_drivers);
	405	spin_unlock(&pnp_lock);
d1d051b2	406
9dd78466 BH	407	list_for_each_safe(pos, temp, &pnp_cards) {
	408	struct pnp_card *card =
	409	list_entry(pos, struct pnp_card, global_list);
	410	card_probe(card, drv);
1da177e4	411	}
982c6094	412	return 0;
1da177e4 LT	413	}
	414
	415	/**
	416	* pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
	417	* @drv: pointer to the driver to unregister
	418	*/
9dd78466	419	void pnp_unregister_card_driver(struct pnp_card_driver *drv)
1da177e4 LT	420	{
	421	spin_lock(&pnp_lock);
	422	list_del(&drv->global_list);
	423	spin_unlock(&pnp_lock);
	424	pnp_unregister_driver(&drv->link);
	425	}
	426
1da177e4 LT	427	EXPORT_SYMBOL(pnp_request_card_device);
	428	EXPORT_SYMBOL(pnp_release_card_device);
	429	EXPORT_SYMBOL(pnp_register_card_driver);
	430	EXPORT_SYMBOL(pnp_unregister_card_driver);