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

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

 #include <linux/config.h>
 #include <linux/module.h>
 #include <linux/slab.h>

 #ifdef CONFIG_PNP_DEBUG
 	#define DEBUG
 #else
 	#undef DEBUG
 #endif

 #include <linux/pnp.h>
 #include "base.h"

 LIST_HEAD(pnp_cards);
 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 = match_card(drv,card);
 	if (id) {
 		struct pnp_card_link * clink = pnp_alloc(sizeof(struct pnp_card_link));
 		if (!clink)
 			return 0;
 		clink->card = card;
 		clink->driver = drv;
 		if (drv->probe) {
 			if (drv->probe(clink, id)>=0)
 				return 1;
 			else {
 				struct pnp_dev * dev;
 				card_for_each_dev(card, dev) {
 					if (dev->card_link == clink)
 						pnp_release_card_device(dev);
 				}
 				kfree(clink);
 			}
 		} else
 			return 1;
 	}
 	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)
 {
 	device_create_file(&card->dev,&dev_attr_name);
 	device_create_file(&card->dev,&dev_attr_card_id);
 	return 0;
 }

 /**
  * 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:
 	down_write(&dev->dev.bus->subsys.rwsem);
 	dev->card_link = clink;
 	dev->dev.driver = &drv->link.driver;
 	if (drv->link.driver.probe) {
 		if (drv->link.driver.probe(&dev->dev)) {
 			dev->dev.driver = NULL;
 			return NULL;
 		}
 	}
 	device_bind_driver(&dev->dev);
 	up_write(&dev->dev.bus->subsys.rwsem);

 	return dev;
 }

 /**
  * 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;
 	down_write(&dev->dev.bus->subsys.rwsem);
 	drv->link.remove = &card_remove;
 	device_release_driver(&dev->dev);
 	drv->link.remove = &card_remove_first;
 	up_write(&dev->dev.bus->subsys.rwsem);
 }

 /**
  * 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 count = 0;
 	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;

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

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

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

	#include <linux/config.h>
	#include <linux/module.h>
	#include <linux/slab.h>

	#ifdef CONFIG_PNP_DEBUG
	#define DEBUG
	#else
	#undef DEBUG
	#endif

	#include <linux/pnp.h>
	#include "base.h"

	LIST_HEAD(pnp_cards);
	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 = match_card(drv,card);
	if (id) {
	struct pnp_card_link * clink = pnp_alloc(sizeof(struct pnp_card_link));
	if (!clink)
	return 0;
	clink->card = card;
	clink->driver = drv;
	if (drv->probe) {
	if (drv->probe(clink, id)>=0)
	return 1;
	else {
	struct pnp_dev * dev;
	card_for_each_dev(card, dev) {
	if (dev->card_link == clink)
	pnp_release_card_device(dev);
	}
	kfree(clink);
	}
	} else
	return 1;
	}
	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)
	{
	device_create_file(&card->dev,&dev_attr_name);
	device_create_file(&card->dev,&dev_attr_card_id);
	return 0;
	}

	/**
	* 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:
	down_write(&dev->dev.bus->subsys.rwsem);
	dev->card_link = clink;
	dev->dev.driver = &drv->link.driver;
	if (drv->link.driver.probe) {
	if (drv->link.driver.probe(&dev->dev)) {
	dev->dev.driver = NULL;
	return NULL;
	}
	}
	device_bind_driver(&dev->dev);
	up_write(&dev->dev.bus->subsys.rwsem);

	return dev;
	}

	/**
	* 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;
	down_write(&dev->dev.bus->subsys.rwsem);
	drv->link.remove = &card_remove;
	device_release_driver(&dev->dev);
	drv->link.remove = &card_remove_first;
	up_write(&dev->dev.bus->subsys.rwsem);
	}

	/**
	* 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 count = 0;
	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;

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

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

	/**
	* 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_add_card);
	EXPORT_SYMBOL(pnp_remove_card);
	EXPORT_SYMBOL(pnp_add_card_device);
	EXPORT_SYMBOL(pnp_remove_card_device);
	EXPORT_SYMBOL(pnp_add_card_id);
	EXPORT_SYMBOL(pnp_request_card_device);
	EXPORT_SYMBOL(pnp_release_card_device);
	EXPORT_SYMBOL(pnp_register_card_driver);
	EXPORT_SYMBOL(pnp_unregister_card_driver);