[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/ctype.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
 */
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);

	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);
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	7	#include <linux/module.h>
e436675f	8	#include <linux/ctype.h>
1da177e4	9	#include <linux/slab.h>
1da177e4 LT	10	#include <linux/pnp.h>
	11	#include "base.h"
	12
	13	LIST_HEAD(pnp_cards);
b449f63c	14	static LIST_HEAD(pnp_card_drivers);
1da177e4	15
9dd78466 BH	16	static const struct pnp_card_device_id match_card(struct pnp_card_driver drv,
9dd78466 BH	17	struct pnp_card *card)
1da177e4	18	{
9dd78466	19	const struct pnp_card_device_id *drv_id = drv->id_table;
07d4e9af	20
9dd78466 BH	21	while (*drv_id->id) {
9dd78466 BH	22	if (compare_pnp_id(card->id, drv_id->id)) {
1da177e4	23	int i = 0;
07d4e9af	24
1da177e4 LT	25	for (;;) {
	26	int found;
	27	struct pnp_dev *dev;
07d4e9af	28
1e0aa9ad BH	29	if (i == PNP_MAX_DEVICES \|\|
1e0aa9ad BH	30	!*drv_id->devs[i].id)
1da177e4 LT	31	return drv_id;
	32	found = 0;
	33	card_for_each_dev(card, dev) {
1e0aa9ad BH	34	if (compare_pnp_id(dev->id,
1e0aa9ad BH	35	drv_id->devs[i].id)) {
1da177e4 LT	36	found = 1;
	37	break;
	38	}
	39	}
9dd78466	40	if (!found)
1da177e4 LT	41	break;
	42	i++;
	43	}
	44	}
	45	drv_id++;
	46	}
	47	return NULL;
	48	}
	49
9dd78466	50	static void card_remove(struct pnp_dev *dev)
1da177e4 LT	51	{
	52	dev->card_link = NULL;
	53	}
982c6094	54
9dd78466	55	static void card_remove_first(struct pnp_dev *dev)
1da177e4	56	{
9dd78466	57	struct pnp_card_driver *drv = to_pnp_card_driver(dev->driver);
07d4e9af	58
1da177e4 LT	59	if (!dev->card \|\| !drv)
	60	return;
	61	if (drv->remove)
	62	drv->remove(dev->card_link);
	63	drv->link.remove = &card_remove;
	64	kfree(dev->card_link);
	65	card_remove(dev);
	66	}
	67
a9adb8db	68	static int card_probe(struct pnp_card card, struct pnp_card_driver drv)
1da177e4	69	{
a9adb8db JJ	70	const struct pnp_card_device_id *id;
	71	struct pnp_card_link *clink;
	72	struct pnp_dev *dev;
	73
	74	if (!drv->probe)
	75	return 0;
9dd78466	76	id = match_card(drv, card);
a9adb8db JJ	77	if (!id)
	78	return 0;
	79
	80	clink = pnp_alloc(sizeof(*clink));
	81	if (!clink)
	82	return 0;
	83	clink->card = card;
	84	clink->driver = drv;
	85	clink->pm_state = PMSG_ON;
	86
	87	if (drv->probe(clink, id) >= 0)
	88	return 1;
	89
	90	/* Recovery */
	91	card_for_each_dev(card, dev) {
	92	if (dev->card_link == clink)
	93	pnp_release_card_device(dev);
1da177e4	94	}
a9adb8db	95	kfree(clink);
1da177e4 LT	96	return 0;
	97	}
	98
	99	/**
	100	* pnp_add_card_id - adds an EISA id to the specified card
	101	* @id: pointer to a pnp_id structure
	102	* @card: pointer to the desired card
1da177e4	103	*/
e436675f	104	struct pnp_id pnp_add_card_id(struct pnp_card card, char *id)
1da177e4	105	{
e436675f BH	106	struct pnp_id dev_id, ptr;
	107
	108	dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
	109	if (!dev_id)
	110	return NULL;
	111
	112	dev_id->id[0] = id[0];
	113	dev_id->id[1] = id[1];
	114	dev_id->id[2] = id[2];
	115	dev_id->id[3] = tolower(id[3]);
	116	dev_id->id[4] = tolower(id[4]);
	117	dev_id->id[5] = tolower(id[5]);
	118	dev_id->id[6] = tolower(id[6]);
	119	dev_id->id[7] = '\0';
	120
	121	dev_id->next = NULL;
1da177e4 LT	122	ptr = card->id;
	123	while (ptr && ptr->next)
	124	ptr = ptr->next;
	125	if (ptr)
e436675f	126	ptr->next = dev_id;
1da177e4	127	else
e436675f BH	128	card->id = dev_id;
	129
	130	return dev_id;
1da177e4 LT	131	}
1da177e4 LT	132
9dd78466	133	static void pnp_free_card_ids(struct pnp_card *card)
1da177e4	134	{
9dd78466	135	struct pnp_id *id;
1da177e4	136	struct pnp_id *next;
07d4e9af	137
1da177e4 LT	138	id = card->id;
	139	while (id) {
	140	next = id->next;
	141	kfree(id);
	142	id = next;
	143	}
	144	}
	145
	146	static void pnp_release_card(struct device *dmdev)
	147	{
9dd78466	148	struct pnp_card *card = to_pnp_card(dmdev);
07d4e9af	149
1da177e4 LT	150	pnp_free_card_ids(card);
	151	kfree(card);
	152	}
	153
6bf2aab2 BH	154	struct pnp_card pnp_alloc_card(struct pnp_protocol protocol, int id, char *pnpid)
	155	{
	156	struct pnp_card *card;
	157	struct pnp_id *dev_id;
	158
	159	card = kzalloc(sizeof(struct pnp_card), GFP_KERNEL);
	160	if (!card)
	161	return NULL;
	162
	163	card->protocol = protocol;
	164	card->number = id;
	165
	166	card->dev.parent = &card->protocol->dev;
	167	sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number,
	168	card->number);
	169
	170	dev_id = pnp_add_card_id(card, pnpid);
	171	if (!dev_id) {
	172	kfree(card);
	173	return NULL;
	174	}
	175
	176	return card;
	177	}
	178
9dd78466 BH	179	static ssize_t pnp_show_card_name(struct device *dmdev,
9dd78466 BH	180	struct device_attribute attr, char buf)
1da177e4 LT	181	{
	182	char *str = buf;
	183	struct pnp_card *card = to_pnp_card(dmdev);
07d4e9af	184
9dd78466	185	str += sprintf(str, "%s\n", card->name);
1da177e4 LT	186	return (str - buf);
	187	}
	188
9dd78466	189	static DEVICE_ATTR(name, S_IRUGO, pnp_show_card_name, NULL);
1da177e4	190
9dd78466 BH	191	static ssize_t pnp_show_card_ids(struct device *dmdev,
9dd78466 BH	192	struct device_attribute attr, char buf)
1da177e4 LT	193	{
	194	char *str = buf;
	195	struct pnp_card *card = to_pnp_card(dmdev);
9dd78466	196	struct pnp_id *pos = card->id;
1da177e4 LT	197
1da177e4 LT	198	while (pos) {
9dd78466	199	str += sprintf(str, "%s\n", pos->id);
1da177e4 LT	200	pos = pos->next;
	201	}
	202	return (str - buf);
	203	}
	204
9dd78466	205	static DEVICE_ATTR(card_id, S_IRUGO, pnp_show_card_ids, NULL);
1da177e4 LT	206
	207	static int pnp_interface_attach_card(struct pnp_card *card)
	208	{
9dd78466	209	int rc = device_create_file(&card->dev, &dev_attr_name);
07d4e9af	210
9dd78466 BH	211	if (rc)
9dd78466 BH	212	return rc;
bfc7ee20	213
9dd78466 BH	214	rc = device_create_file(&card->dev, &dev_attr_card_id);
	215	if (rc)
	216	goto err_name;
bfc7ee20	217
1da177e4	218	return 0;
bfc7ee20	219
1e0aa9ad	220	err_name:
9dd78466	221	device_remove_file(&card->dev, &dev_attr_name);
bfc7ee20	222	return rc;
1da177e4 LT	223	}
	224
	225	/**
	226	* pnp_add_card - adds a PnP card to the PnP Layer
	227	* @card: pointer to the card to add
	228	*/
9dd78466	229	int pnp_add_card(struct pnp_card *card)
1da177e4 LT	230	{
1da177e4 LT	231	int error;
9dd78466	232	struct list_head pos, temp;
07d4e9af	233
1da177e4 LT	234	card->dev.bus = NULL;
	235	card->dev.release = &pnp_release_card;
	236	error = device_register(&card->dev);
5bfc43a0	237	if (error) {
a05d0781	238	dev_err(&card->dev, "could not register (err=%d)\n", error);
5bfc43a0 BH	239	return error;
	240	}
	241
	242	pnp_interface_attach_card(card);
	243	spin_lock(&pnp_lock);
	244	list_add_tail(&card->global_list, &pnp_cards);
	245	list_add_tail(&card->protocol_list, &card->protocol->cards);
	246	spin_unlock(&pnp_lock);
	247
	248	/* we wait until now to add devices in order to ensure the drivers
	249	* will be able to use all of the related devices on the card
	250	* without waiting an unreasonable length of time */
	251	list_for_each(pos, &card->devices) {
	252	struct pnp_dev *dev = card_to_pnp_dev(pos);
	253	__pnp_add_device(dev);
	254	}
	255
	256	/* match with card drivers */
	257	list_for_each_safe(pos, temp, &pnp_card_drivers) {
	258	struct pnp_card_driver *drv =
	259	list_entry(pos, struct pnp_card_driver,
	260	global_list);
	261	card_probe(card, drv);
	262	}
	263	return 0;
1da177e4 LT	264	}
	265
	266	/**
	267	* pnp_remove_card - removes a PnP card from the PnP Layer
	268	* @card: pointer to the card to remove
	269	*/
9dd78466	270	void pnp_remove_card(struct pnp_card *card)
1da177e4 LT	271	{
1da177e4 LT	272	struct list_head pos, temp;
07d4e9af	273
1da177e4 LT	274	device_unregister(&card->dev);
	275	spin_lock(&pnp_lock);
	276	list_del(&card->global_list);
	277	list_del(&card->protocol_list);
	278	spin_unlock(&pnp_lock);
9dd78466	279	list_for_each_safe(pos, temp, &card->devices) {
1da177e4 LT	280	struct pnp_dev *dev = card_to_pnp_dev(pos);
	281	pnp_remove_card_device(dev);
	282	}
	283	}
	284
	285	/**
	286	* pnp_add_card_device - adds a device to the specified card
	287	* @card: pointer to the card to add to
	288	* @dev: pointer to the device to add
	289	*/
9dd78466	290	int pnp_add_card_device(struct pnp_card card, struct pnp_dev dev)
1da177e4	291	{
1da177e4 LT	292	dev->dev.parent = &card->dev;
1da177e4 LT	293	dev->card_link = NULL;
9dd78466 BH	294	snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x",
9dd78466 BH	295	dev->protocol->number, card->number, dev->number);
1da177e4 LT	296	spin_lock(&pnp_lock);
	297	dev->card = card;
	298	list_add_tail(&dev->card_list, &card->devices);
	299	spin_unlock(&pnp_lock);
	300	return 0;
	301	}
	302
	303	/**
	304	* pnp_remove_card_device- removes a device from the specified card
1da177e4 LT	305	* @dev: pointer to the device to remove
1da177e4 LT	306	*/
9dd78466	307	void pnp_remove_card_device(struct pnp_dev *dev)
1da177e4 LT	308	{
	309	spin_lock(&pnp_lock);
	310	dev->card = NULL;
	311	list_del(&dev->card_list);
	312	spin_unlock(&pnp_lock);
	313	__pnp_remove_device(dev);
	314	}
	315
	316	/**
	317	* pnp_request_card_device - Searches for a PnP device under the specified card
3d41088f	318	* @clink: pointer to the card link, cannot be NULL
1da177e4 LT	319	* @id: pointer to a PnP ID structure that explains the rules for finding the device
	320	* @from: Starting place to search from. If NULL it will start from the begining.
	321	*/
9dd78466 BH	322	struct pnp_dev pnp_request_card_device(struct pnp_card_link clink,
9dd78466 BH	323	const char id, struct pnp_dev from)
1da177e4	324	{
9dd78466 BH	325	struct list_head *pos;
	326	struct pnp_dev *dev;
	327	struct pnp_card_driver *drv;
	328	struct pnp_card *card;
07d4e9af	329
1da177e4	330	if (!clink \|\| !id)
5bfc43a0 BH	331	return NULL;
5bfc43a0 BH	332
1da177e4 LT	333	card = clink->card;
	334	drv = clink->driver;
	335	if (!from) {
	336	pos = card->devices.next;
	337	} else {
	338	if (from->card != card)
5bfc43a0	339	return NULL;
1da177e4 LT	340	pos = from->card_list.next;
	341	}
	342	while (pos != &card->devices) {
	343	dev = card_to_pnp_dev(pos);
9dd78466	344	if ((!dev->card_link) && compare_pnp_id(dev->id, id))
1da177e4 LT	345	goto found;
	346	pos = pos->next;
	347	}
	348
1da177e4 LT	349	return NULL;
1da177e4 LT	350
1e0aa9ad	351	found:
1da177e4 LT	352	dev->card_link = clink;
1da177e4 LT	353	dev->dev.driver = &drv->link.driver;
bfc7ee20 JG	354	if (pnp_bus_type.probe(&dev->dev))
	355	goto err_out;
	356	if (device_bind_driver(&dev->dev))
	357	goto err_out;
	358
1da177e4	359	return dev;
bfc7ee20	360
1e0aa9ad	361	err_out:
bfc7ee20 JG	362	dev->dev.driver = NULL;
bfc7ee20 JG	363	dev->card_link = NULL;
bfc7ee20	364	return NULL;
1da177e4 LT	365	}
	366
	367	/**
	368	* pnp_release_card_device - call this when the driver no longer needs the device
	369	* @dev: pointer to the PnP device stucture
	370	*/
9dd78466	371	void pnp_release_card_device(struct pnp_dev *dev)
1da177e4	372	{
9dd78466	373	struct pnp_card_driver *drv = dev->card_link->driver;
07d4e9af	374
1da177e4 LT	375	drv->link.remove = &card_remove;
	376	device_release_driver(&dev->dev);
	377	drv->link.remove = &card_remove_first;
1da177e4 LT	378	}
1da177e4 LT	379
4c98cfef TI	380	/*
	381	* suspend/resume callbacks
	382	*/
	383	static int card_suspend(struct pnp_dev *dev, pm_message_t state)
	384	{
	385	struct pnp_card_link *link = dev->card_link;
07d4e9af	386
4c98cfef TI	387	if (link->pm_state.event == state.event)
	388	return 0;
	389	link->pm_state = state;
	390	return link->driver->suspend(link, state);
	391	}
	392
	393	static int card_resume(struct pnp_dev *dev)
	394	{
	395	struct pnp_card_link *link = dev->card_link;
07d4e9af	396
4c98cfef TI	397	if (link->pm_state.event == PM_EVENT_ON)
	398	return 0;
	399	link->pm_state = PMSG_ON;
	400	link->driver->resume(link);
	401	return 0;
	402	}
	403
1da177e4 LT	404	/**
	405	* pnp_register_card_driver - registers a PnP card driver with the PnP Layer
	406	* @drv: pointer to the driver to register
	407	*/
9dd78466	408	int pnp_register_card_driver(struct pnp_card_driver *drv)
1da177e4	409	{
982c6094	410	int error;
1da177e4 LT	411	struct list_head pos, temp;
	412
	413	drv->link.name = drv->name;
	414	drv->link.id_table = NULL; /* this will disable auto matching */
	415	drv->link.flags = drv->flags;
	416	drv->link.probe = NULL;
	417	drv->link.remove = &card_remove_first;
4c98cfef TI	418	drv->link.suspend = drv->suspend ? card_suspend : NULL;
4c98cfef TI	419	drv->link.resume = drv->resume ? card_resume : NULL;
1da177e4	420
982c6094 BH	421	error = pnp_register_driver(&drv->link);
	422	if (error < 0)
	423	return error;
d1d051b2	424
1da177e4 LT	425	spin_lock(&pnp_lock);
	426	list_add_tail(&drv->global_list, &pnp_card_drivers);
	427	spin_unlock(&pnp_lock);
d1d051b2	428
9dd78466 BH	429	list_for_each_safe(pos, temp, &pnp_cards) {
	430	struct pnp_card *card =
	431	list_entry(pos, struct pnp_card, global_list);
	432	card_probe(card, drv);
1da177e4	433	}
982c6094	434	return 0;
1da177e4 LT	435	}
	436
	437	/**
	438	* pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
	439	* @drv: pointer to the driver to unregister
	440	*/
9dd78466	441	void pnp_unregister_card_driver(struct pnp_card_driver *drv)
1da177e4 LT	442	{
	443	spin_lock(&pnp_lock);
	444	list_del(&drv->global_list);
	445	spin_unlock(&pnp_lock);
	446	pnp_unregister_driver(&drv->link);
	447	}
	448
1da177e4 LT	449	EXPORT_SYMBOL(pnp_request_card_device);
	450	EXPORT_SYMBOL(pnp_release_card_device);
	451	EXPORT_SYMBOL(pnp_register_card_driver);
	452	EXPORT_SYMBOL(pnp_unregister_card_driver);