/* * 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);