// 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
  ", 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
  ", 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)
  ", 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);