[net-next-2.6.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 <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;
	dev_set_name(&card->dev, "%02x:%02x", card->protocol->number, card->number);

	card->dev.coherent_dma_mask = DMA_BIT_MASK(24);
	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;
	dev_set_name(&dev->dev, "%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	10	#include <linux/pnp.h>
e86b19ce	11	#include <linux/dma-mapping.h>
1da177e4 LT	12	#include "base.h"
	13
	14	LIST_HEAD(pnp_cards);
b449f63c	15	static LIST_HEAD(pnp_card_drivers);
1da177e4	16
9dd78466 BH	17	static const struct pnp_card_device_id match_card(struct pnp_card_driver drv,
9dd78466 BH	18	struct pnp_card *card)
1da177e4	19	{
9dd78466	20	const struct pnp_card_device_id *drv_id = drv->id_table;
07d4e9af	21
9dd78466 BH	22	while (*drv_id->id) {
9dd78466 BH	23	if (compare_pnp_id(card->id, drv_id->id)) {
1da177e4	24	int i = 0;
07d4e9af	25
1da177e4 LT	26	for (;;) {
	27	int found;
	28	struct pnp_dev *dev;
07d4e9af	29
1e0aa9ad BH	30	if (i == PNP_MAX_DEVICES \|\|
1e0aa9ad BH	31	!*drv_id->devs[i].id)
1da177e4 LT	32	return drv_id;
	33	found = 0;
	34	card_for_each_dev(card, dev) {
1e0aa9ad BH	35	if (compare_pnp_id(dev->id,
1e0aa9ad BH	36	drv_id->devs[i].id)) {
1da177e4 LT	37	found = 1;
	38	break;
	39	}
	40	}
9dd78466	41	if (!found)
1da177e4 LT	42	break;
	43	i++;
	44	}
	45	}
	46	drv_id++;
	47	}
	48	return NULL;
	49	}
	50
9dd78466	51	static void card_remove(struct pnp_dev *dev)
1da177e4 LT	52	{
	53	dev->card_link = NULL;
	54	}
982c6094	55
9dd78466	56	static void card_remove_first(struct pnp_dev *dev)
1da177e4	57	{
9dd78466	58	struct pnp_card_driver *drv = to_pnp_card_driver(dev->driver);
07d4e9af	59
1da177e4 LT	60	if (!dev->card \|\| !drv)
	61	return;
	62	if (drv->remove)
	63	drv->remove(dev->card_link);
	64	drv->link.remove = &card_remove;
	65	kfree(dev->card_link);
	66	card_remove(dev);
	67	}
	68
a9adb8db	69	static int card_probe(struct pnp_card card, struct pnp_card_driver drv)
1da177e4	70	{
a9adb8db JJ	71	const struct pnp_card_device_id *id;
	72	struct pnp_card_link *clink;
	73	struct pnp_dev *dev;
	74
	75	if (!drv->probe)
	76	return 0;
9dd78466	77	id = match_card(drv, card);
a9adb8db JJ	78	if (!id)
	79	return 0;
	80
	81	clink = pnp_alloc(sizeof(*clink));
	82	if (!clink)
	83	return 0;
	84	clink->card = card;
	85	clink->driver = drv;
	86	clink->pm_state = PMSG_ON;
	87
	88	if (drv->probe(clink, id) >= 0)
	89	return 1;
	90
	91	/* Recovery */
	92	card_for_each_dev(card, dev) {
	93	if (dev->card_link == clink)
	94	pnp_release_card_device(dev);
1da177e4	95	}
a9adb8db	96	kfree(clink);
1da177e4 LT	97	return 0;
	98	}
	99
	100	/**
	101	* pnp_add_card_id - adds an EISA id to the specified card
	102	* @id: pointer to a pnp_id structure
	103	* @card: pointer to the desired card
1da177e4	104	*/
25cdcd00	105	static struct pnp_id pnp_add_card_id(struct pnp_card card, char *id)
1da177e4	106	{
e436675f BH	107	struct pnp_id dev_id, ptr;
	108
	109	dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
	110	if (!dev_id)
	111	return NULL;
	112
	113	dev_id->id[0] = id[0];
	114	dev_id->id[1] = id[1];
	115	dev_id->id[2] = id[2];
	116	dev_id->id[3] = tolower(id[3]);
	117	dev_id->id[4] = tolower(id[4]);
	118	dev_id->id[5] = tolower(id[5]);
	119	dev_id->id[6] = tolower(id[6]);
	120	dev_id->id[7] = '\0';
	121
	122	dev_id->next = NULL;
1da177e4 LT	123	ptr = card->id;
	124	while (ptr && ptr->next)
	125	ptr = ptr->next;
	126	if (ptr)
e436675f	127	ptr->next = dev_id;
1da177e4	128	else
e436675f BH	129	card->id = dev_id;
	130
	131	return dev_id;
1da177e4 LT	132	}
1da177e4 LT	133
9dd78466	134	static void pnp_free_card_ids(struct pnp_card *card)
1da177e4	135	{
9dd78466	136	struct pnp_id *id;
1da177e4	137	struct pnp_id *next;
07d4e9af	138
1da177e4 LT	139	id = card->id;
	140	while (id) {
	141	next = id->next;
	142	kfree(id);
	143	id = next;
	144	}
	145	}
	146
	147	static void pnp_release_card(struct device *dmdev)
	148	{
9dd78466	149	struct pnp_card *card = to_pnp_card(dmdev);
07d4e9af	150
1da177e4 LT	151	pnp_free_card_ids(card);
	152	kfree(card);
	153	}
	154
6bf2aab2 BH	155	struct pnp_card pnp_alloc_card(struct pnp_protocol protocol, int id, char *pnpid)
	156	{
	157	struct pnp_card *card;
	158	struct pnp_id *dev_id;
	159
	160	card = kzalloc(sizeof(struct pnp_card), GFP_KERNEL);
	161	if (!card)
	162	return NULL;
	163
	164	card->protocol = protocol;
	165	card->number = id;
	166
	167	card->dev.parent = &card->protocol->dev;
c85e37c5	168	dev_set_name(&card->dev, "%02x:%02x", card->protocol->number, card->number);
6bf2aab2	169
2f4f27d4	170	card->dev.coherent_dma_mask = DMA_BIT_MASK(24);
e86b19ce RH	171	card->dev.dma_mask = &card->dev.coherent_dma_mask;
e86b19ce RH	172
6bf2aab2 BH	173	dev_id = pnp_add_card_id(card, pnpid);
	174	if (!dev_id) {
	175	kfree(card);
	176	return NULL;
	177	}
	178
	179	return card;
	180	}
	181
9dd78466 BH	182	static ssize_t pnp_show_card_name(struct device *dmdev,
9dd78466 BH	183	struct device_attribute attr, char buf)
1da177e4 LT	184	{
	185	char *str = buf;
	186	struct pnp_card *card = to_pnp_card(dmdev);
07d4e9af	187
9dd78466	188	str += sprintf(str, "%s\n", card->name);
1da177e4 LT	189	return (str - buf);
	190	}
	191
9dd78466	192	static DEVICE_ATTR(name, S_IRUGO, pnp_show_card_name, NULL);
1da177e4	193
9dd78466 BH	194	static ssize_t pnp_show_card_ids(struct device *dmdev,
9dd78466 BH	195	struct device_attribute attr, char buf)
1da177e4 LT	196	{
	197	char *str = buf;
	198	struct pnp_card *card = to_pnp_card(dmdev);
9dd78466	199	struct pnp_id *pos = card->id;
1da177e4 LT	200
1da177e4 LT	201	while (pos) {
9dd78466	202	str += sprintf(str, "%s\n", pos->id);
1da177e4 LT	203	pos = pos->next;
	204	}
	205	return (str - buf);
	206	}
	207
9dd78466	208	static DEVICE_ATTR(card_id, S_IRUGO, pnp_show_card_ids, NULL);
1da177e4 LT	209
	210	static int pnp_interface_attach_card(struct pnp_card *card)
	211	{
9dd78466	212	int rc = device_create_file(&card->dev, &dev_attr_name);
07d4e9af	213
9dd78466 BH	214	if (rc)
9dd78466 BH	215	return rc;
bfc7ee20	216
9dd78466 BH	217	rc = device_create_file(&card->dev, &dev_attr_card_id);
	218	if (rc)
	219	goto err_name;
bfc7ee20	220
1da177e4	221	return 0;
bfc7ee20	222
1e0aa9ad	223	err_name:
9dd78466	224	device_remove_file(&card->dev, &dev_attr_name);
bfc7ee20	225	return rc;
1da177e4 LT	226	}
	227
	228	/**
	229	* pnp_add_card - adds a PnP card to the PnP Layer
	230	* @card: pointer to the card to add
	231	*/
9dd78466	232	int pnp_add_card(struct pnp_card *card)
1da177e4 LT	233	{
1da177e4 LT	234	int error;
9dd78466	235	struct list_head pos, temp;
07d4e9af	236
1da177e4 LT	237	card->dev.bus = NULL;
	238	card->dev.release = &pnp_release_card;
	239	error = device_register(&card->dev);
5bfc43a0	240	if (error) {
a05d0781	241	dev_err(&card->dev, "could not register (err=%d)\n", error);
5bfc43a0 BH	242	return error;
	243	}
	244
	245	pnp_interface_attach_card(card);
	246	spin_lock(&pnp_lock);
	247	list_add_tail(&card->global_list, &pnp_cards);
	248	list_add_tail(&card->protocol_list, &card->protocol->cards);
	249	spin_unlock(&pnp_lock);
	250
	251	/* we wait until now to add devices in order to ensure the drivers
	252	* will be able to use all of the related devices on the card
	253	* without waiting an unreasonable length of time */
	254	list_for_each(pos, &card->devices) {
	255	struct pnp_dev *dev = card_to_pnp_dev(pos);
	256	__pnp_add_device(dev);
	257	}
	258
	259	/* match with card drivers */
	260	list_for_each_safe(pos, temp, &pnp_card_drivers) {
	261	struct pnp_card_driver *drv =
	262	list_entry(pos, struct pnp_card_driver,
	263	global_list);
	264	card_probe(card, drv);
	265	}
	266	return 0;
1da177e4 LT	267	}
	268
	269	/**
	270	* pnp_remove_card - removes a PnP card from the PnP Layer
	271	* @card: pointer to the card to remove
	272	*/
9dd78466	273	void pnp_remove_card(struct pnp_card *card)
1da177e4 LT	274	{
1da177e4 LT	275	struct list_head pos, temp;
07d4e9af	276
1da177e4 LT	277	device_unregister(&card->dev);
	278	spin_lock(&pnp_lock);
	279	list_del(&card->global_list);
	280	list_del(&card->protocol_list);
	281	spin_unlock(&pnp_lock);
9dd78466	282	list_for_each_safe(pos, temp, &card->devices) {
1da177e4 LT	283	struct pnp_dev *dev = card_to_pnp_dev(pos);
	284	pnp_remove_card_device(dev);
	285	}
	286	}
	287
	288	/**
	289	* pnp_add_card_device - adds a device to the specified card
	290	* @card: pointer to the card to add to
	291	* @dev: pointer to the device to add
	292	*/
9dd78466	293	int pnp_add_card_device(struct pnp_card card, struct pnp_dev dev)
1da177e4	294	{
1da177e4 LT	295	dev->dev.parent = &card->dev;
1da177e4 LT	296	dev->card_link = NULL;
c85e37c5 KS	297	dev_set_name(&dev->dev, "%02x:%02x.%02x",
c85e37c5 KS	298	dev->protocol->number, card->number, dev->number);
1da177e4 LT	299	spin_lock(&pnp_lock);
	300	dev->card = card;
	301	list_add_tail(&dev->card_list, &card->devices);
	302	spin_unlock(&pnp_lock);
	303	return 0;
	304	}
	305
	306	/**
	307	* pnp_remove_card_device- removes a device from the specified card
1da177e4 LT	308	* @dev: pointer to the device to remove
1da177e4 LT	309	*/
9dd78466	310	void pnp_remove_card_device(struct pnp_dev *dev)
1da177e4 LT	311	{
	312	spin_lock(&pnp_lock);
	313	dev->card = NULL;
	314	list_del(&dev->card_list);
	315	spin_unlock(&pnp_lock);
	316	__pnp_remove_device(dev);
	317	}
	318
	319	/**
	320	* pnp_request_card_device - Searches for a PnP device under the specified card
3d41088f	321	* @clink: pointer to the card link, cannot be NULL
1da177e4 LT	322	* @id: pointer to a PnP ID structure that explains the rules for finding the device
	323	* @from: Starting place to search from. If NULL it will start from the begining.
	324	*/
9dd78466 BH	325	struct pnp_dev pnp_request_card_device(struct pnp_card_link clink,
9dd78466 BH	326	const char id, struct pnp_dev from)
1da177e4	327	{
9dd78466 BH	328	struct list_head *pos;
	329	struct pnp_dev *dev;
	330	struct pnp_card_driver *drv;
	331	struct pnp_card *card;
07d4e9af	332
1da177e4	333	if (!clink \|\| !id)
5bfc43a0 BH	334	return NULL;
5bfc43a0 BH	335
1da177e4 LT	336	card = clink->card;
	337	drv = clink->driver;
	338	if (!from) {
	339	pos = card->devices.next;
	340	} else {
	341	if (from->card != card)
5bfc43a0	342	return NULL;
1da177e4 LT	343	pos = from->card_list.next;
	344	}
	345	while (pos != &card->devices) {
	346	dev = card_to_pnp_dev(pos);
9dd78466	347	if ((!dev->card_link) && compare_pnp_id(dev->id, id))
1da177e4 LT	348	goto found;
	349	pos = pos->next;
	350	}
	351
1da177e4 LT	352	return NULL;
1da177e4 LT	353
1e0aa9ad	354	found:
1da177e4 LT	355	dev->card_link = clink;
1da177e4 LT	356	dev->dev.driver = &drv->link.driver;
bfc7ee20 JG	357	if (pnp_bus_type.probe(&dev->dev))
	358	goto err_out;
	359	if (device_bind_driver(&dev->dev))
	360	goto err_out;
	361
1da177e4	362	return dev;
bfc7ee20	363
1e0aa9ad	364	err_out:
bfc7ee20 JG	365	dev->dev.driver = NULL;
bfc7ee20 JG	366	dev->card_link = NULL;
bfc7ee20	367	return NULL;
1da177e4 LT	368	}
	369
	370	/**
	371	* pnp_release_card_device - call this when the driver no longer needs the device
	372	* @dev: pointer to the PnP device stucture
	373	*/
9dd78466	374	void pnp_release_card_device(struct pnp_dev *dev)
1da177e4	375	{
9dd78466	376	struct pnp_card_driver *drv = dev->card_link->driver;
07d4e9af	377
1da177e4 LT	378	drv->link.remove = &card_remove;
	379	device_release_driver(&dev->dev);
	380	drv->link.remove = &card_remove_first;
1da177e4 LT	381	}
1da177e4 LT	382
4c98cfef TI	383	/*
	384	* suspend/resume callbacks
	385	*/
	386	static int card_suspend(struct pnp_dev *dev, pm_message_t state)
	387	{
	388	struct pnp_card_link *link = dev->card_link;
07d4e9af	389
4c98cfef TI	390	if (link->pm_state.event == state.event)
	391	return 0;
	392	link->pm_state = state;
	393	return link->driver->suspend(link, state);
	394	}
	395
	396	static int card_resume(struct pnp_dev *dev)
	397	{
	398	struct pnp_card_link *link = dev->card_link;
07d4e9af	399
4c98cfef TI	400	if (link->pm_state.event == PM_EVENT_ON)
	401	return 0;
	402	link->pm_state = PMSG_ON;
	403	link->driver->resume(link);
	404	return 0;
	405	}
	406
1da177e4 LT	407	/**
	408	* pnp_register_card_driver - registers a PnP card driver with the PnP Layer
	409	* @drv: pointer to the driver to register
	410	*/
9dd78466	411	int pnp_register_card_driver(struct pnp_card_driver *drv)
1da177e4	412	{
982c6094	413	int error;
1da177e4 LT	414	struct list_head pos, temp;
	415
	416	drv->link.name = drv->name;
	417	drv->link.id_table = NULL; /* this will disable auto matching */
	418	drv->link.flags = drv->flags;
	419	drv->link.probe = NULL;
	420	drv->link.remove = &card_remove_first;
4c98cfef TI	421	drv->link.suspend = drv->suspend ? card_suspend : NULL;
4c98cfef TI	422	drv->link.resume = drv->resume ? card_resume : NULL;
1da177e4	423
982c6094 BH	424	error = pnp_register_driver(&drv->link);
	425	if (error < 0)
	426	return error;
d1d051b2	427
1da177e4 LT	428	spin_lock(&pnp_lock);
	429	list_add_tail(&drv->global_list, &pnp_card_drivers);
	430	spin_unlock(&pnp_lock);
d1d051b2	431
9dd78466 BH	432	list_for_each_safe(pos, temp, &pnp_cards) {
	433	struct pnp_card *card =
	434	list_entry(pos, struct pnp_card, global_list);
	435	card_probe(card, drv);
1da177e4	436	}
982c6094	437	return 0;
1da177e4 LT	438	}
	439
	440	/**
	441	* pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
	442	* @drv: pointer to the driver to unregister
	443	*/
9dd78466	444	void pnp_unregister_card_driver(struct pnp_card_driver *drv)
1da177e4 LT	445	{
	446	spin_lock(&pnp_lock);
	447	list_del(&drv->global_list);
	448	spin_unlock(&pnp_lock);
	449	pnp_unregister_driver(&drv->link);
	450	}
	451
1da177e4 LT	452	EXPORT_SYMBOL(pnp_request_card_device);
	453	EXPORT_SYMBOL(pnp_release_card_device);
	454	EXPORT_SYMBOL(pnp_register_card_driver);
	455	EXPORT_SYMBOL(pnp_unregister_card_driver);