[people/arne_f/kernel.git] / drivers / pnp / card.c

// SPDX-License-Identifier: GPL-2.0
/*
 * card.c - contains functions for managing groups of PnP devices
 *
 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
 */

#include <linux/module.h>
#include <linux/mutex.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);
		put_device(&card->dev);
		return error;
	}

	pnp_interface_attach_card(card);
	mutex_lock(&pnp_lock);
	list_add_tail(&card->global_list, &pnp_cards);
	list_add_tail(&card->protocol_list, &card->protocol->cards);
	mutex_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);
	mutex_lock(&pnp_lock);
	list_del(&card->global_list);
	list_del(&card->protocol_list);
	mutex_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);
	mutex_lock(&pnp_lock);
	dev->card = card;
	list_add_tail(&dev->card_list, &card->devices);
	mutex_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)
{
	mutex_lock(&pnp_lock);
	dev->card = NULL;
	list_del(&dev->card_list);
	mutex_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 beginning.
 */
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 structure
 */
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;

	mutex_lock(&pnp_lock);
	list_add_tail(&drv->global_list, &pnp_card_drivers);
	mutex_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)
{
	mutex_lock(&pnp_lock);
	list_del(&drv->global_list);
	mutex_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
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* card.c - contains functions for managing groups of PnP devices
	4	*
	5	* Copyright 2002 Adam Belay <ambx1@neo.rr.com>
1da177e4 LT	6	*/
1da177e4 LT	7
1da177e4	8	#include <linux/module.h>
38f6b38d	9	#include <linux/mutex.h>
e436675f	10	#include <linux/ctype.h>
1da177e4	11	#include <linux/slab.h>
1da177e4	12	#include <linux/pnp.h>
e86b19ce	13	#include <linux/dma-mapping.h>
1da177e4 LT	14	#include "base.h"
	15
	16	LIST_HEAD(pnp_cards);
b449f63c	17	static LIST_HEAD(pnp_card_drivers);
1da177e4	18
9dd78466 BH	19	static const struct pnp_card_device_id match_card(struct pnp_card_driver drv,
9dd78466 BH	20	struct pnp_card *card)
1da177e4	21	{
9dd78466	22	const struct pnp_card_device_id *drv_id = drv->id_table;
07d4e9af	23
9dd78466 BH	24	while (*drv_id->id) {
9dd78466 BH	25	if (compare_pnp_id(card->id, drv_id->id)) {
1da177e4	26	int i = 0;
07d4e9af	27
1da177e4 LT	28	for (;;) {
	29	int found;
	30	struct pnp_dev *dev;
07d4e9af	31
1e0aa9ad BH	32	if (i == PNP_MAX_DEVICES \|\|
1e0aa9ad BH	33	!*drv_id->devs[i].id)
1da177e4 LT	34	return drv_id;
	35	found = 0;
	36	card_for_each_dev(card, dev) {
1e0aa9ad BH	37	if (compare_pnp_id(dev->id,
1e0aa9ad BH	38	drv_id->devs[i].id)) {
1da177e4 LT	39	found = 1;
	40	break;
	41	}
	42	}
9dd78466	43	if (!found)
1da177e4 LT	44	break;
	45	i++;
	46	}
	47	}
	48	drv_id++;
	49	}
	50	return NULL;
	51	}
	52
9dd78466	53	static void card_remove(struct pnp_dev *dev)
1da177e4 LT	54	{
	55	dev->card_link = NULL;
	56	}
982c6094	57
9dd78466	58	static void card_remove_first(struct pnp_dev *dev)
1da177e4	59	{
9dd78466	60	struct pnp_card_driver *drv = to_pnp_card_driver(dev->driver);
07d4e9af	61
1da177e4 LT	62	if (!dev->card \|\| !drv)
	63	return;
	64	if (drv->remove)
	65	drv->remove(dev->card_link);
	66	drv->link.remove = &card_remove;
	67	kfree(dev->card_link);
	68	card_remove(dev);
	69	}
	70
a9adb8db	71	static int card_probe(struct pnp_card card, struct pnp_card_driver drv)
1da177e4	72	{
a9adb8db JJ	73	const struct pnp_card_device_id *id;
	74	struct pnp_card_link *clink;
	75	struct pnp_dev *dev;
	76
	77	if (!drv->probe)
	78	return 0;
9dd78466	79	id = match_card(drv, card);
a9adb8db JJ	80	if (!id)
	81	return 0;
	82
	83	clink = pnp_alloc(sizeof(*clink));
	84	if (!clink)
	85	return 0;
	86	clink->card = card;
	87	clink->driver = drv;
	88	clink->pm_state = PMSG_ON;
	89
	90	if (drv->probe(clink, id) >= 0)
	91	return 1;
	92
	93	/* Recovery */
	94	card_for_each_dev(card, dev) {
	95	if (dev->card_link == clink)
	96	pnp_release_card_device(dev);
1da177e4	97	}
a9adb8db	98	kfree(clink);
1da177e4 LT	99	return 0;
	100	}
	101
	102	/**
	103	* pnp_add_card_id - adds an EISA id to the specified card
	104	* @id: pointer to a pnp_id structure
	105	* @card: pointer to the desired card
1da177e4	106	*/
25cdcd00	107	static struct pnp_id pnp_add_card_id(struct pnp_card card, char *id)
1da177e4	108	{
e436675f BH	109	struct pnp_id dev_id, ptr;
	110
	111	dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
	112	if (!dev_id)
	113	return NULL;
	114
	115	dev_id->id[0] = id[0];
	116	dev_id->id[1] = id[1];
	117	dev_id->id[2] = id[2];
	118	dev_id->id[3] = tolower(id[3]);
	119	dev_id->id[4] = tolower(id[4]);
	120	dev_id->id[5] = tolower(id[5]);
	121	dev_id->id[6] = tolower(id[6]);
	122	dev_id->id[7] = '\0';
	123
	124	dev_id->next = NULL;
1da177e4 LT	125	ptr = card->id;
	126	while (ptr && ptr->next)
	127	ptr = ptr->next;
	128	if (ptr)
e436675f	129	ptr->next = dev_id;
1da177e4	130	else
e436675f BH	131	card->id = dev_id;
	132
	133	return dev_id;
1da177e4 LT	134	}
1da177e4 LT	135
9dd78466	136	static void pnp_free_card_ids(struct pnp_card *card)
1da177e4	137	{
9dd78466	138	struct pnp_id *id;
1da177e4	139	struct pnp_id *next;
07d4e9af	140
1da177e4 LT	141	id = card->id;
	142	while (id) {
	143	next = id->next;
	144	kfree(id);
	145	id = next;
	146	}
	147	}
	148
	149	static void pnp_release_card(struct device *dmdev)
	150	{
9dd78466	151	struct pnp_card *card = to_pnp_card(dmdev);
07d4e9af	152
1da177e4 LT	153	pnp_free_card_ids(card);
	154	kfree(card);
	155	}
	156
6bf2aab2 BH	157	struct pnp_card pnp_alloc_card(struct pnp_protocol protocol, int id, char *pnpid)
	158	{
	159	struct pnp_card *card;
	160	struct pnp_id *dev_id;
	161
	162	card = kzalloc(sizeof(struct pnp_card), GFP_KERNEL);
	163	if (!card)
	164	return NULL;
	165
	166	card->protocol = protocol;
	167	card->number = id;
	168
	169	card->dev.parent = &card->protocol->dev;
c85e37c5	170	dev_set_name(&card->dev, "%02x:%02x", card->protocol->number, card->number);
6bf2aab2	171
2f4f27d4	172	card->dev.coherent_dma_mask = DMA_BIT_MASK(24);
e86b19ce RH	173	card->dev.dma_mask = &card->dev.coherent_dma_mask;
e86b19ce RH	174
6bf2aab2 BH	175	dev_id = pnp_add_card_id(card, pnpid);
	176	if (!dev_id) {
	177	kfree(card);
	178	return NULL;
	179	}
	180
	181	return card;
	182	}
	183
9dd78466 BH	184	static ssize_t pnp_show_card_name(struct device *dmdev,
9dd78466 BH	185	struct device_attribute attr, char buf)
1da177e4 LT	186	{
	187	char *str = buf;
	188	struct pnp_card *card = to_pnp_card(dmdev);
07d4e9af	189
9dd78466	190	str += sprintf(str, "%s\n", card->name);
1da177e4 LT	191	return (str - buf);
	192	}
	193
9dd78466	194	static DEVICE_ATTR(name, S_IRUGO, pnp_show_card_name, NULL);
1da177e4	195
9dd78466 BH	196	static ssize_t pnp_show_card_ids(struct device *dmdev,
9dd78466 BH	197	struct device_attribute attr, char buf)
1da177e4 LT	198	{
	199	char *str = buf;
	200	struct pnp_card *card = to_pnp_card(dmdev);
9dd78466	201	struct pnp_id *pos = card->id;
1da177e4 LT	202
1da177e4 LT	203	while (pos) {
9dd78466	204	str += sprintf(str, "%s\n", pos->id);
1da177e4 LT	205	pos = pos->next;
	206	}
	207	return (str - buf);
	208	}
	209
9dd78466	210	static DEVICE_ATTR(card_id, S_IRUGO, pnp_show_card_ids, NULL);
1da177e4 LT	211
	212	static int pnp_interface_attach_card(struct pnp_card *card)
	213	{
9dd78466	214	int rc = device_create_file(&card->dev, &dev_attr_name);
07d4e9af	215
9dd78466 BH	216	if (rc)
9dd78466 BH	217	return rc;
bfc7ee20	218
9dd78466 BH	219	rc = device_create_file(&card->dev, &dev_attr_card_id);
	220	if (rc)
	221	goto err_name;
bfc7ee20	222
1da177e4	223	return 0;
bfc7ee20	224
1e0aa9ad	225	err_name:
9dd78466	226	device_remove_file(&card->dev, &dev_attr_name);
bfc7ee20	227	return rc;
1da177e4 LT	228	}
	229
	230	/**
	231	* pnp_add_card - adds a PnP card to the PnP Layer
	232	* @card: pointer to the card to add
	233	*/
9dd78466	234	int pnp_add_card(struct pnp_card *card)
1da177e4 LT	235	{
1da177e4 LT	236	int error;
9dd78466	237	struct list_head pos, temp;
07d4e9af	238
1da177e4 LT	239	card->dev.bus = NULL;
	240	card->dev.release = &pnp_release_card;
	241	error = device_register(&card->dev);
5bfc43a0	242	if (error) {
a05d0781	243	dev_err(&card->dev, "could not register (err=%d)\n", error);
75365d04	244	put_device(&card->dev);
5bfc43a0 BH	245	return error;
	246	}
	247
	248	pnp_interface_attach_card(card);
38f6b38d	249	mutex_lock(&pnp_lock);
5bfc43a0 BH	250	list_add_tail(&card->global_list, &pnp_cards);
5bfc43a0 BH	251	list_add_tail(&card->protocol_list, &card->protocol->cards);
38f6b38d	252	mutex_unlock(&pnp_lock);
5bfc43a0 BH	253
	254	/* we wait until now to add devices in order to ensure the drivers
	255	* will be able to use all of the related devices on the card
	256	* without waiting an unreasonable length of time */
	257	list_for_each(pos, &card->devices) {
	258	struct pnp_dev *dev = card_to_pnp_dev(pos);
	259	__pnp_add_device(dev);
	260	}
	261
	262	/* match with card drivers */
	263	list_for_each_safe(pos, temp, &pnp_card_drivers) {
	264	struct pnp_card_driver *drv =
	265	list_entry(pos, struct pnp_card_driver,
	266	global_list);
	267	card_probe(card, drv);
	268	}
	269	return 0;
1da177e4 LT	270	}
	271
	272	/**
	273	* pnp_remove_card - removes a PnP card from the PnP Layer
	274	* @card: pointer to the card to remove
	275	*/
9dd78466	276	void pnp_remove_card(struct pnp_card *card)
1da177e4 LT	277	{
1da177e4 LT	278	struct list_head pos, temp;
07d4e9af	279
1da177e4	280	device_unregister(&card->dev);
38f6b38d	281	mutex_lock(&pnp_lock);
1da177e4 LT	282	list_del(&card->global_list);
1da177e4 LT	283	list_del(&card->protocol_list);
38f6b38d	284	mutex_unlock(&pnp_lock);
9dd78466	285	list_for_each_safe(pos, temp, &card->devices) {
1da177e4 LT	286	struct pnp_dev *dev = card_to_pnp_dev(pos);
	287	pnp_remove_card_device(dev);
	288	}
	289	}
	290
	291	/**
	292	* pnp_add_card_device - adds a device to the specified card
	293	* @card: pointer to the card to add to
	294	* @dev: pointer to the device to add
	295	*/
9dd78466	296	int pnp_add_card_device(struct pnp_card card, struct pnp_dev dev)
1da177e4	297	{
1da177e4 LT	298	dev->dev.parent = &card->dev;
1da177e4 LT	299	dev->card_link = NULL;
c85e37c5 KS	300	dev_set_name(&dev->dev, "%02x:%02x.%02x",
c85e37c5 KS	301	dev->protocol->number, card->number, dev->number);
38f6b38d	302	mutex_lock(&pnp_lock);
1da177e4 LT	303	dev->card = card;
1da177e4 LT	304	list_add_tail(&dev->card_list, &card->devices);
38f6b38d	305	mutex_unlock(&pnp_lock);
1da177e4 LT	306	return 0;
	307	}
	308
	309	/**
	310	* pnp_remove_card_device- removes a device from the specified card
1da177e4 LT	311	* @dev: pointer to the device to remove
1da177e4 LT	312	*/
9dd78466	313	void pnp_remove_card_device(struct pnp_dev *dev)
1da177e4	314	{
38f6b38d	315	mutex_lock(&pnp_lock);
1da177e4 LT	316	dev->card = NULL;
1da177e4 LT	317	list_del(&dev->card_list);
38f6b38d	318	mutex_unlock(&pnp_lock);
1da177e4 LT	319	__pnp_remove_device(dev);
	320	}
	321
	322	/**
	323	* pnp_request_card_device - Searches for a PnP device under the specified card
3d41088f	324	* @clink: pointer to the card link, cannot be NULL
1da177e4	325	* @id: pointer to a PnP ID structure that explains the rules for finding the device
25985edc	326	* @from: Starting place to search from. If NULL it will start from the beginning.
1da177e4	327	*/
9dd78466 BH	328	struct pnp_dev pnp_request_card_device(struct pnp_card_link clink,
9dd78466 BH	329	const char id, struct pnp_dev from)
1da177e4	330	{
9dd78466 BH	331	struct list_head *pos;
	332	struct pnp_dev *dev;
	333	struct pnp_card_driver *drv;
	334	struct pnp_card *card;
07d4e9af	335
1da177e4	336	if (!clink \|\| !id)
5bfc43a0 BH	337	return NULL;
5bfc43a0 BH	338
1da177e4 LT	339	card = clink->card;
	340	drv = clink->driver;
	341	if (!from) {
	342	pos = card->devices.next;
	343	} else {
	344	if (from->card != card)
5bfc43a0	345	return NULL;
1da177e4 LT	346	pos = from->card_list.next;
	347	}
	348	while (pos != &card->devices) {
	349	dev = card_to_pnp_dev(pos);
9dd78466	350	if ((!dev->card_link) && compare_pnp_id(dev->id, id))
1da177e4 LT	351	goto found;
	352	pos = pos->next;
	353	}
	354
1da177e4 LT	355	return NULL;
1da177e4 LT	356
1e0aa9ad	357	found:
1da177e4 LT	358	dev->card_link = clink;
1da177e4 LT	359	dev->dev.driver = &drv->link.driver;
bfc7ee20 JG	360	if (pnp_bus_type.probe(&dev->dev))
	361	goto err_out;
	362	if (device_bind_driver(&dev->dev))
	363	goto err_out;
	364
1da177e4	365	return dev;
bfc7ee20	366
1e0aa9ad	367	err_out:
bfc7ee20 JG	368	dev->dev.driver = NULL;
bfc7ee20 JG	369	dev->card_link = NULL;
bfc7ee20	370	return NULL;
1da177e4 LT	371	}
	372
	373	/**
	374	* pnp_release_card_device - call this when the driver no longer needs the device
25985edc	375	* @dev: pointer to the PnP device structure
1da177e4	376	*/
9dd78466	377	void pnp_release_card_device(struct pnp_dev *dev)
1da177e4	378	{
9dd78466	379	struct pnp_card_driver *drv = dev->card_link->driver;
07d4e9af	380
1da177e4 LT	381	drv->link.remove = &card_remove;
	382	device_release_driver(&dev->dev);
	383	drv->link.remove = &card_remove_first;
1da177e4 LT	384	}
1da177e4 LT	385
4c98cfef TI	386	/*
	387	* suspend/resume callbacks
	388	*/
	389	static int card_suspend(struct pnp_dev *dev, pm_message_t state)
	390	{
	391	struct pnp_card_link *link = dev->card_link;
07d4e9af	392
4c98cfef TI	393	if (link->pm_state.event == state.event)
	394	return 0;
	395	link->pm_state = state;
	396	return link->driver->suspend(link, state);
	397	}
	398
	399	static int card_resume(struct pnp_dev *dev)
	400	{
	401	struct pnp_card_link *link = dev->card_link;
07d4e9af	402
4c98cfef TI	403	if (link->pm_state.event == PM_EVENT_ON)
	404	return 0;
	405	link->pm_state = PMSG_ON;
	406	link->driver->resume(link);
	407	return 0;
	408	}
	409
1da177e4 LT	410	/**
	411	* pnp_register_card_driver - registers a PnP card driver with the PnP Layer
	412	* @drv: pointer to the driver to register
	413	*/
9dd78466	414	int pnp_register_card_driver(struct pnp_card_driver *drv)
1da177e4	415	{
982c6094	416	int error;
1da177e4 LT	417	struct list_head pos, temp;
	418
	419	drv->link.name = drv->name;
	420	drv->link.id_table = NULL; /* this will disable auto matching */
	421	drv->link.flags = drv->flags;
	422	drv->link.probe = NULL;
	423	drv->link.remove = &card_remove_first;
4c98cfef TI	424	drv->link.suspend = drv->suspend ? card_suspend : NULL;
4c98cfef TI	425	drv->link.resume = drv->resume ? card_resume : NULL;
1da177e4	426
982c6094 BH	427	error = pnp_register_driver(&drv->link);
	428	if (error < 0)
	429	return error;
d1d051b2	430
38f6b38d	431	mutex_lock(&pnp_lock);
1da177e4	432	list_add_tail(&drv->global_list, &pnp_card_drivers);
38f6b38d	433	mutex_unlock(&pnp_lock);
d1d051b2	434
9dd78466 BH	435	list_for_each_safe(pos, temp, &pnp_cards) {
	436	struct pnp_card *card =
	437	list_entry(pos, struct pnp_card, global_list);
	438	card_probe(card, drv);
1da177e4	439	}
982c6094	440	return 0;
1da177e4 LT	441	}
	442
	443	/**
	444	* pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
	445	* @drv: pointer to the driver to unregister
	446	*/
9dd78466	447	void pnp_unregister_card_driver(struct pnp_card_driver *drv)
1da177e4	448	{
38f6b38d	449	mutex_lock(&pnp_lock);
1da177e4	450	list_del(&drv->global_list);
38f6b38d	451	mutex_unlock(&pnp_lock);
1da177e4 LT	452	pnp_unregister_driver(&drv->link);
	453	}
	454
1da177e4 LT	455	EXPORT_SYMBOL(pnp_request_card_device);
	456	EXPORT_SYMBOL(pnp_release_card_device);
	457	EXPORT_SYMBOL(pnp_register_card_driver);
	458	EXPORT_SYMBOL(pnp_unregister_card_driver);