/* * drivers/pci/pci-driver.c * */ #include <linux/pci.h> #include <linux/module.h> #include <linux/init.h> #include <linux/device.h> #include <linux/pci-dynids.h> #include "pci.h" /* * Registration of PCI drivers and handling of hot-pluggable devices. */ /* * Dynamic device IDs are disabled for !CONFIG_HOTPLUG */ #ifdef CONFIG_HOTPLUG /** * pci_device_probe_dynamic() * * Walk the dynamic ID list looking for a match. * returns 0 and sets pci_dev->driver when drv claims pci_dev, else error. */ static int pci_device_probe_dynamic(struct pci_driver *drv, struct pci_dev *pci_dev) { int error = -ENODEV; struct list_head *pos; struct dynid *dynid; spin_lock(&drv->dynids.lock); list_for_each(pos, &drv->dynids.list) { dynid = list_entry(pos, struct dynid, node); if (pci_match_one_device(&dynid->id, pci_dev)) { spin_unlock(&drv->dynids.lock); error = drv->probe(pci_dev, &dynid->id); if (error >= 0) { pci_dev->driver = drv; return 0; } return error; } } spin_unlock(&drv->dynids.lock); return error; } /** * store_new_id * * Adds a new dynamic pci device ID to this driver, * and causes the driver to probe for all devices again. */ static inline ssize_t store_new_id(struct device_driver *driver, const char *buf, size_t count) { struct dynid *dynid; struct bus_type * bus; struct pci_driver *pdrv = to_pci_driver(driver); __u32 vendor=PCI_ANY_ID, device=PCI_ANY_ID, subvendor=PCI_ANY_ID, subdevice=PCI_ANY_ID, class=0, class_mask=0; unsigned long driver_data=0; int fields=0; fields = sscanf(buf, "%x %x %x %x %x %x %lux", &vendor, &device, &subvendor, &subdevice, &class, &class_mask, &driver_data); if (fields < 0) return -EINVAL; dynid = kmalloc(sizeof(*dynid), GFP_KERNEL); if (!dynid) return -ENOMEM; memset(dynid, 0, sizeof(*dynid)); INIT_LIST_HEAD(&dynid->node); dynid->id.vendor = vendor; dynid->id.device = device; dynid->id.subvendor = subvendor; dynid->id.subdevice = subdevice; dynid->id.class = class; dynid->id.class_mask = class_mask; dynid->id.driver_data = pdrv->dynids.use_driver_data ? driver_data : 0UL; spin_lock(&pdrv->dynids.lock); list_add_tail(&pdrv->dynids.list, &dynid->node); spin_unlock(&pdrv->dynids.lock); bus = get_bus(pdrv->driver.bus); if (bus) { if (get_driver(&pdrv->driver)) { down_write(&bus->subsys.rwsem); driver_attach(&pdrv->driver); up_write(&bus->subsys.rwsem); put_driver(&pdrv->driver); } put_bus(bus); } return count; } static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id); static inline void pci_init_dynids(struct pci_dynids *dynids) { spin_lock_init(&dynids->lock); INIT_LIST_HEAD(&dynids->list); } static void pci_free_dynids(struct pci_driver *drv) { struct list_head *pos, *n; struct dynid *dynid; spin_lock(&drv->dynids.lock); list_for_each_safe(pos, n, &drv->dynids.list) { dynid = list_entry(pos, struct dynid, node); list_del(&dynid->node); kfree(dynid); } spin_unlock(&drv->dynids.lock); } static int pci_create_newid_file(struct pci_driver *drv) { int error = 0; if (drv->probe != NULL) error = sysfs_create_file(&drv->driver.kobj, &driver_attr_new_id.attr); return error; } static int pci_bus_match_dynids(const struct pci_dev *pci_dev, struct pci_driver *pci_drv) { struct list_head *pos; struct dynid *dynid; spin_lock(&pci_drv->dynids.lock); list_for_each(pos, &pci_drv->dynids.list) { dynid = list_entry(pos, struct dynid, node); if (pci_match_one_device(&dynid->id, pci_dev)) { spin_unlock(&pci_drv->dynids.lock); return 1; } } spin_unlock(&pci_drv->dynids.lock); return 0; } #else /* !CONFIG_HOTPLUG */ static inline int pci_device_probe_dynamic(struct pci_driver *drv, struct pci_dev *pci_dev) { return -ENODEV; } static inline void pci_init_dynids(struct pci_dynids *dynids) {} static inline void pci_free_dynids(struct pci_driver *drv) {} static inline int pci_create_newid_file(struct pci_driver *drv) { return 0; } static inline int pci_bus_match_dynids(const struct pci_dev *pci_dev, struct pci_driver *pci_drv) { return 0; } #endif /** * pci_match_device - Tell if a PCI device structure has a matching * PCI device id structure * @ids: array of PCI device id structures to search in * @dev: the PCI device structure to match against * * Used by a driver to check whether a PCI device present in the * system is in its list of supported devices.Returns the matching * pci_device_id structure or %NULL if there is no match. */ const struct pci_device_id * pci_match_device(const struct pci_device_id *ids, const struct pci_dev *dev) { while (ids->vendor || ids->subvendor || ids->class_mask) { if (pci_match_one_device(ids, dev)) return ids; ids++; } return NULL; } /** * pci_device_probe_static() * * returns 0 and sets pci_dev->driver when drv claims pci_dev, else error. */ static int pci_device_probe_static(struct pci_driver *drv, struct pci_dev *pci_dev) { int error = -ENODEV; const struct pci_device_id *id; if (!drv->id_table) return error; id = pci_match_device(drv->id_table, pci_dev); if (id) error = drv->probe(pci_dev, id); if (error >= 0) { pci_dev->driver = drv; error = 0; } return error; } /** * __pci_device_probe() * * returns 0 on success, else error. * side-effect: pci_dev->driver is set to drv when drv claims pci_dev. */ static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev) { int error = 0; if (!pci_dev->driver && drv->probe) { error = pci_device_probe_static(drv, pci_dev); if (error == -ENODEV) error = pci_device_probe_dynamic(drv, pci_dev); } return error; } static int pci_device_probe(struct device * dev) { int error = 0; struct pci_driver *drv; struct pci_dev *pci_dev; drv = to_pci_driver(dev->driver); pci_dev = to_pci_dev(dev); pci_dev_get(pci_dev); error = __pci_device_probe(drv, pci_dev); if (error) pci_dev_put(pci_dev); return error; } static int pci_device_remove(struct device * dev) { struct pci_dev * pci_dev = to_pci_dev(dev); struct pci_driver * drv = pci_dev->driver; if (drv) { if (drv->remove) drv->remove(pci_dev); pci_dev->driver = NULL; } /* * We would love to complain here if pci_dev->is_enabled is set, that * the driver should have called pci_disable_device(), but the * unfortunate fact is there are too many odd BIOS and bridge setups * that don't like drivers doing that all of the time. * Oh well, we can dream of sane hardware when we sleep, no matter how * horrible the crap we have to deal with is when we are awake... */ pci_dev_put(pci_dev); return 0; } static int pci_device_suspend(struct device * dev, pm_message_t state) { struct pci_dev * pci_dev = to_pci_dev(dev); struct pci_driver * drv = pci_dev->driver; int i = 0; if (drv && drv->suspend) i = drv->suspend(pci_dev, state); else pci_save_state(pci_dev); return i; } /* * Default resume method for devices that have no driver provided resume, * or not even a driver at all. */ static void pci_default_resume(struct pci_dev *pci_dev) { /* restore the PCI config space */ pci_restore_state(pci_dev); /* if the device was enabled before suspend, reenable */ if (pci_dev->is_enabled) pci_enable_device(pci_dev); /* if the device was busmaster before the suspend, make it busmaster again */ if (pci_dev->is_busmaster) pci_set_master(pci_dev); } static int pci_device_resume(struct device * dev) { struct pci_dev * pci_dev = to_pci_dev(dev); struct pci_driver * drv = pci_dev->driver; if (drv && drv->resume) drv->resume(pci_dev); else pci_default_resume(pci_dev); return 0; } static void pci_device_shutdown(struct device *dev) { struct pci_dev *pci_dev = to_pci_dev(dev); struct pci_driver *drv = pci_dev->driver; if (drv && drv->shutdown) drv->shutdown(pci_dev); } #define kobj_to_pci_driver(obj) container_of(obj, struct device_driver, kobj) #define attr_to_driver_attribute(obj) container_of(obj, struct driver_attribute, attr) static ssize_t pci_driver_attr_show(struct kobject * kobj, struct attribute *attr, char *buf) { struct device_driver *driver = kobj_to_pci_driver(kobj); struct driver_attribute *dattr = attr_to_driver_attribute(attr); ssize_t ret; if (!get_driver(driver)) return -ENODEV; ret = dattr->show ? dattr->show(driver, buf) : -EIO; put_driver(driver); return ret; } static ssize_t pci_driver_attr_store(struct kobject * kobj, struct attribute *attr, const char *buf, size_t count) { struct device_driver *driver = kobj_to_pci_driver(kobj); struct driver_attribute *dattr = attr_to_driver_attribute(attr); ssize_t ret; if (!get_driver(driver)) return -ENODEV; ret = dattr->store ? dattr->store(driver, buf, count) : -EIO; put_driver(driver); return ret; } static struct sysfs_ops pci_driver_sysfs_ops = { .show = pci_driver_attr_show, .store = pci_driver_attr_store, }; static struct kobj_type pci_driver_kobj_type = { .sysfs_ops = &pci_driver_sysfs_ops, }; static int pci_populate_driver_dir(struct pci_driver *drv) { return pci_create_newid_file(drv); } /** * pci_register_driver - register a new pci driver * @drv: the driver structure to register * * Adds the driver structure to the list of registered drivers. * Returns a negative value on error, otherwise 0. * If no error occurred, the driver remains registered even if * no device was claimed during registration. */ int pci_register_driver(struct pci_driver *drv) { int error; /* initialize common driver fields */ drv->driver.name = drv->name; drv->driver.bus = &pci_bus_type; drv->driver.probe = pci_device_probe; drv->driver.remove = pci_device_remove; /* FIXME, once all of the existing PCI drivers have been fixed to set * the pci shutdown function, this test can go away. */ if (!drv->driver.shutdown) drv->driver.shutdown = pci_device_shutdown; drv->driver.owner = drv->owner; drv->driver.kobj.ktype = &pci_driver_kobj_type; pci_init_dynids(&drv->dynids); /* register with core */ error = driver_register(&drv->driver); if (!error) pci_populate_driver_dir(drv); return error; } /** * pci_unregister_driver - unregister a pci driver * @drv: the driver structure to unregister * * Deletes the driver structure from the list of registered PCI drivers, * gives it a chance to clean up by calling its remove() function for * each device it was responsible for, and marks those devices as * driverless. */ void pci_unregister_driver(struct pci_driver *drv) { driver_unregister(&drv->driver); pci_free_dynids(drv); } static struct pci_driver pci_compat_driver = { .name = "compat" }; /** * pci_dev_driver - get the pci_driver of a device * @dev: the device to query * * Returns the appropriate pci_driver structure or %NULL if there is no * registered driver for the device. */ struct pci_driver * pci_dev_driver(const struct pci_dev *dev) { if (dev->driver) return dev->driver; else { int i; for(i=0; i<=PCI_ROM_RESOURCE; i++) if (dev->resource[i].flags & IORESOURCE_BUSY) return &pci_compat_driver; } return NULL; } /** * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure * @ids: array of PCI device id structures to search in * @dev: the PCI device structure to match against * * Used by a driver to check whether a PCI device present in the * system is in its list of supported devices.Returns the matching * pci_device_id structure or %NULL if there is no match. */ static int pci_bus_match(struct device * dev, struct device_driver * drv) { const struct pci_dev * pci_dev = to_pci_dev(dev); struct pci_driver * pci_drv = to_pci_driver(drv); const struct pci_device_id * ids = pci_drv->id_table; const struct pci_device_id *found_id; if (!ids) return 0; found_id = pci_match_device(ids, pci_dev); if (found_id) return 1; return pci_bus_match_dynids(pci_dev, pci_drv); } /** * pci_dev_get - increments the reference count of the pci device structure * @dev: the device being referenced * * Each live reference to a device should be refcounted. * * Drivers for PCI devices should normally record such references in * their probe() methods, when they bind to a device, and release * them by calling pci_dev_put(), in their disconnect() methods. * * A pointer to the device with the incremented reference counter is returned. */ struct pci_dev *pci_dev_get(struct pci_dev *dev) { if (dev) get_device(&dev->dev); return dev; } /** * pci_dev_put - release a use of the pci device structure * @dev: device that's been disconnected * * Must be called when a user of a device is finished with it. When the last * user of the device calls this function, the memory of the device is freed. */ void pci_dev_put(struct pci_dev *dev) { if (dev) put_device(&dev->dev); } #ifndef CONFIG_HOTPLUG int pci_hotplug (struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) { return -ENODEV; } #endif struct bus_type pci_bus_type = { .name = "pci", .match = pci_bus_match, .hotplug = pci_hotplug, .suspend = pci_device_suspend, .resume = pci_device_resume, .dev_attrs = pci_dev_attrs, }; static int __init pci_driver_init(void) { return bus_register(&pci_bus_type); } postcore_initcall(pci_driver_init); EXPORT_SYMBOL(pci_match_device); EXPORT_SYMBOL(pci_register_driver); EXPORT_SYMBOL(pci_unregister_driver); EXPORT_SYMBOL(pci_dev_driver); EXPORT_SYMBOL(pci_bus_type); EXPORT_SYMBOL(pci_dev_get); EXPORT_SYMBOL(pci_dev_put);