/* * driver.c - device id matching, driver model, etc. * * Copyright 2002 Adam Belay <ambx1@neo.rr.com> * */ #include <linux/config.h> #include <linux/string.h> #include <linux/list.h> #include <linux/module.h> #include <linux/ctype.h> #include <linux/slab.h> #ifdef CONFIG_PNP_DEBUG #define DEBUG #else #undef DEBUG #endif #include <linux/pnp.h> #include "base.h" static int compare_func(const char *ida, const char *idb) { int i; /* we only need to compare the last 4 chars */ for (i=3; i<7; i++) { if (ida[i] != 'X' && idb[i] != 'X' && toupper(ida[i]) != toupper(idb[i])) return 0; } return 1; } int compare_pnp_id(struct pnp_id *pos, const char *id) { if (!pos || !id || (strlen(id) != 7)) return 0; if (memcmp(id,"ANYDEVS",7)==0) return 1; while (pos){ if (memcmp(pos->id,id,3)==0) if (compare_func(pos->id,id)==1) return 1; pos = pos->next; } return 0; } static const struct pnp_device_id * match_device(struct pnp_driver *drv, struct pnp_dev *dev) { const struct pnp_device_id *drv_id = drv->id_table; if (!drv_id) return NULL; while (*drv_id->id) { if (compare_pnp_id(dev->id, drv_id->id)) return drv_id; drv_id++; } return NULL; } int pnp_device_attach(struct pnp_dev *pnp_dev) { spin_lock(&pnp_lock); if(pnp_dev->status != PNP_READY){ spin_unlock(&pnp_lock); return -EBUSY; } pnp_dev->status = PNP_ATTACHED; spin_unlock(&pnp_lock); return 0; } void pnp_device_detach(struct pnp_dev *pnp_dev) { spin_lock(&pnp_lock); if (pnp_dev->status == PNP_ATTACHED) pnp_dev->status = PNP_READY; spin_unlock(&pnp_lock); pnp_disable_dev(pnp_dev); } static int pnp_device_probe(struct device *dev) { int error; struct pnp_driver *pnp_drv; struct pnp_dev *pnp_dev; const struct pnp_device_id *dev_id = NULL; pnp_dev = to_pnp_dev(dev); pnp_drv = to_pnp_driver(dev->driver); pnp_dbg("match found with the PnP device '%s' and the driver '%s'", dev->bus_id,pnp_drv->name); error = pnp_device_attach(pnp_dev); if (error < 0) return error; if (pnp_dev->active == 0) { if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) { error = pnp_activate_dev(pnp_dev); if (error < 0) return error; } } else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE) == PNP_DRIVER_RES_DISABLE) { error = pnp_disable_dev(pnp_dev); if (error < 0) return error; } error = 0; if (pnp_drv->probe) { dev_id = match_device(pnp_drv, pnp_dev); if (dev_id != NULL) error = pnp_drv->probe(pnp_dev, dev_id); } if (error >= 0){ pnp_dev->driver = pnp_drv; error = 0; } else goto fail; return error; fail: pnp_device_detach(pnp_dev); return error; } static int pnp_device_remove(struct device *dev) { struct pnp_dev * pnp_dev = to_pnp_dev(dev); struct pnp_driver * drv = pnp_dev->driver; if (drv) { if (drv->remove) drv->remove(pnp_dev); pnp_dev->driver = NULL; } pnp_device_detach(pnp_dev); return 0; } static int pnp_bus_match(struct device *dev, struct device_driver *drv) { struct pnp_dev * pnp_dev = to_pnp_dev(dev); struct pnp_driver * pnp_drv = to_pnp_driver(drv); if (match_device(pnp_drv, pnp_dev) == NULL) return 0; return 1; } struct bus_type pnp_bus_type = { .name = "pnp", .match = pnp_bus_match, }; int pnp_register_driver(struct pnp_driver *drv) { int count; struct list_head *pos; pnp_dbg("the driver '%s' has been registered", drv->name); drv->driver.name = drv->name; drv->driver.bus = &pnp_bus_type; drv->driver.probe = pnp_device_probe; drv->driver.remove = pnp_device_remove; count = driver_register(&drv->driver); /* get the number of initial matches */ if (count >= 0){ count = 0; list_for_each(pos,&drv->driver.devices){ count++; } } return count; } void pnp_unregister_driver(struct pnp_driver *drv) { driver_unregister(&drv->driver); pnp_dbg("the driver '%s' has been unregistered", drv->name); } /** * pnp_add_id - adds an EISA id to the specified device * @id: pointer to a pnp_id structure * @dev: pointer to the desired device * */ int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev) { struct pnp_id *ptr; if (!id) return -EINVAL; if (!dev) return -EINVAL; id->next = NULL; ptr = dev->id; while (ptr && ptr->next) ptr = ptr->next; if (ptr) ptr->next = id; else dev->id = id; return 0; } EXPORT_SYMBOL(pnp_register_driver); EXPORT_SYMBOL(pnp_unregister_driver); EXPORT_SYMBOL(pnp_add_id); EXPORT_SYMBOL(pnp_device_attach); EXPORT_SYMBOL(pnp_device_detach);