/* * 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_24BIT_MASK; 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);