2 * drivers/pci/pci-driver.c
4 * (C) Copyright 2002-2004, 2007 Greg Kroah-Hartman <greg@kroah.com>
5 * (C) Copyright 2007 Novell Inc.
7 * Released under the GPL v2 only.
11 #include <linux/pci.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/device.h>
15 #include <linux/mempolicy.h>
16 #include <linux/string.h>
17 #include <linux/slab.h>
18 #include <linux/sched.h>
22 * Dynamic device IDs are disabled for !CONFIG_HOTPLUG
26 struct list_head node;
27 struct pci_device_id id;
33 * store_new_id - add a new PCI device ID to this driver and re-probe devices
34 * @driver: target device driver
35 * @buf: buffer for scanning device ID data
38 * Adds a new dynamic pci device ID to this driver,
39 * and causes the driver to probe for all devices again.
42 store_new_id(struct device_driver *driver, const char *buf, size_t count)
44 struct pci_dynid *dynid;
45 struct pci_driver *pdrv = to_pci_driver(driver);
46 __u32 vendor, device, subvendor=PCI_ANY_ID,
47 subdevice=PCI_ANY_ID, class=0, class_mask=0;
48 unsigned long driver_data=0;
52 fields = sscanf(buf, "%x %x %x %x %x %x %lux",
53 &vendor, &device, &subvendor, &subdevice,
54 &class, &class_mask, &driver_data);
58 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
62 dynid->id.vendor = vendor;
63 dynid->id.device = device;
64 dynid->id.subvendor = subvendor;
65 dynid->id.subdevice = subdevice;
66 dynid->id.class = class;
67 dynid->id.class_mask = class_mask;
68 dynid->id.driver_data = pdrv->dynids.use_driver_data ?
71 spin_lock(&pdrv->dynids.lock);
72 list_add_tail(&dynid->node, &pdrv->dynids.list);
73 spin_unlock(&pdrv->dynids.lock);
75 if (get_driver(&pdrv->driver)) {
76 retval = driver_attach(&pdrv->driver);
77 put_driver(&pdrv->driver);
84 static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
87 pci_free_dynids(struct pci_driver *drv)
89 struct pci_dynid *dynid, *n;
91 spin_lock(&drv->dynids.lock);
92 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
93 list_del(&dynid->node);
96 spin_unlock(&drv->dynids.lock);
100 pci_create_newid_file(struct pci_driver *drv)
103 if (drv->probe != NULL)
104 error = driver_create_file(&drv->driver, &driver_attr_new_id);
108 static void pci_remove_newid_file(struct pci_driver *drv)
110 driver_remove_file(&drv->driver, &driver_attr_new_id);
112 #else /* !CONFIG_HOTPLUG */
113 static inline void pci_free_dynids(struct pci_driver *drv) {}
114 static inline int pci_create_newid_file(struct pci_driver *drv)
118 static inline void pci_remove_newid_file(struct pci_driver *drv) {}
122 * pci_match_id - See if a pci device matches a given pci_id table
123 * @ids: array of PCI device id structures to search in
124 * @dev: the PCI device structure to match against.
126 * Used by a driver to check whether a PCI device present in the
127 * system is in its list of supported devices. Returns the matching
128 * pci_device_id structure or %NULL if there is no match.
130 * Deprecated, don't use this as it will not catch any dynamic ids
131 * that a driver might want to check for.
133 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
137 while (ids->vendor || ids->subvendor || ids->class_mask) {
138 if (pci_match_one_device(ids, dev))
147 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
148 * @drv: the PCI driver to match against
149 * @dev: the PCI device structure to match against
151 * Used by a driver to check whether a PCI device present in the
152 * system is in its list of supported devices. Returns the matching
153 * pci_device_id structure or %NULL if there is no match.
155 static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
158 struct pci_dynid *dynid;
160 /* Look at the dynamic ids first, before the static ones */
161 spin_lock(&drv->dynids.lock);
162 list_for_each_entry(dynid, &drv->dynids.list, node) {
163 if (pci_match_one_device(&dynid->id, dev)) {
164 spin_unlock(&drv->dynids.lock);
168 spin_unlock(&drv->dynids.lock);
170 return pci_match_id(drv->id_table, dev);
173 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
174 const struct pci_device_id *id)
178 /* Execute driver initialization on node where the
179 device's bus is attached to. This way the driver likely
180 allocates its local memory on the right node without
181 any need to change it. */
182 struct mempolicy *oldpol;
183 cpumask_t oldmask = current->cpus_allowed;
184 int node = pcibus_to_node(dev->bus);
185 if (node >= 0 && node_online(node))
186 set_cpus_allowed(current, node_to_cpumask(node));
187 /* And set default memory allocation policy */
188 oldpol = current->mempolicy;
189 current->mempolicy = NULL; /* fall back to system default policy */
191 error = drv->probe(dev, id);
193 set_cpus_allowed(current, oldmask);
194 current->mempolicy = oldpol;
200 * __pci_device_probe()
201 * @drv: driver to call to check if it wants the PCI device
202 * @pci_dev: PCI device being probed
204 * returns 0 on success, else error.
205 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
208 __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
210 const struct pci_device_id *id;
213 if (!pci_dev->driver && drv->probe) {
216 id = pci_match_device(drv, pci_dev);
218 error = pci_call_probe(drv, pci_dev, id);
220 pci_dev->driver = drv;
227 static int pci_device_probe(struct device * dev)
230 struct pci_driver *drv;
231 struct pci_dev *pci_dev;
233 drv = to_pci_driver(dev->driver);
234 pci_dev = to_pci_dev(dev);
235 pci_dev_get(pci_dev);
236 error = __pci_device_probe(drv, pci_dev);
238 pci_dev_put(pci_dev);
243 static int pci_device_remove(struct device * dev)
245 struct pci_dev * pci_dev = to_pci_dev(dev);
246 struct pci_driver * drv = pci_dev->driver;
250 drv->remove(pci_dev);
251 pci_dev->driver = NULL;
255 * If the device is still on, set the power state as "unknown",
256 * since it might change by the next time we load the driver.
258 if (pci_dev->current_state == PCI_D0)
259 pci_dev->current_state = PCI_UNKNOWN;
262 * We would love to complain here if pci_dev->is_enabled is set, that
263 * the driver should have called pci_disable_device(), but the
264 * unfortunate fact is there are too many odd BIOS and bridge setups
265 * that don't like drivers doing that all of the time.
266 * Oh well, we can dream of sane hardware when we sleep, no matter how
267 * horrible the crap we have to deal with is when we are awake...
270 pci_dev_put(pci_dev);
274 static int pci_device_suspend(struct device * dev, pm_message_t state)
276 struct pci_dev * pci_dev = to_pci_dev(dev);
277 struct pci_driver * drv = pci_dev->driver;
280 if (drv && drv->suspend) {
281 i = drv->suspend(pci_dev, state);
282 suspend_report_result(drv->suspend, i);
284 pci_save_state(pci_dev);
286 * mark its power state as "unknown", since we don't know if
287 * e.g. the BIOS will change its device state when we suspend.
289 if (pci_dev->current_state == PCI_D0)
290 pci_dev->current_state = PCI_UNKNOWN;
295 static int pci_device_suspend_late(struct device * dev, pm_message_t state)
297 struct pci_dev * pci_dev = to_pci_dev(dev);
298 struct pci_driver * drv = pci_dev->driver;
301 if (drv && drv->suspend_late) {
302 i = drv->suspend_late(pci_dev, state);
303 suspend_report_result(drv->suspend_late, i);
309 * Default resume method for devices that have no driver provided resume,
310 * or not even a driver at all.
312 static int pci_default_resume(struct pci_dev *pci_dev)
316 /* restore the PCI config space */
317 pci_restore_state(pci_dev);
318 /* if the device was enabled before suspend, reenable */
319 retval = pci_reenable_device(pci_dev);
320 /* if the device was busmaster before the suspend, make it busmaster again */
321 if (pci_dev->is_busmaster)
322 pci_set_master(pci_dev);
327 static int pci_device_resume(struct device * dev)
330 struct pci_dev * pci_dev = to_pci_dev(dev);
331 struct pci_driver * drv = pci_dev->driver;
333 if (drv && drv->resume)
334 error = drv->resume(pci_dev);
336 error = pci_default_resume(pci_dev);
340 static int pci_device_resume_early(struct device * dev)
343 struct pci_dev * pci_dev = to_pci_dev(dev);
344 struct pci_driver * drv = pci_dev->driver;
346 pci_fixup_device(pci_fixup_resume, pci_dev);
348 if (drv && drv->resume_early)
349 error = drv->resume_early(pci_dev);
353 static void pci_device_shutdown(struct device *dev)
355 struct pci_dev *pci_dev = to_pci_dev(dev);
356 struct pci_driver *drv = pci_dev->driver;
358 if (drv && drv->shutdown)
359 drv->shutdown(pci_dev);
363 * __pci_register_driver - register a new pci driver
364 * @drv: the driver structure to register
365 * @owner: owner module of drv
366 * @mod_name: module name string
368 * Adds the driver structure to the list of registered drivers.
369 * Returns a negative value on error, otherwise 0.
370 * If no error occurred, the driver remains registered even if
371 * no device was claimed during registration.
373 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
374 const char *mod_name)
378 /* initialize common driver fields */
379 drv->driver.name = drv->name;
380 drv->driver.bus = &pci_bus_type;
381 drv->driver.owner = owner;
382 drv->driver.mod_name = mod_name;
384 spin_lock_init(&drv->dynids.lock);
385 INIT_LIST_HEAD(&drv->dynids.list);
387 /* register with core */
388 error = driver_register(&drv->driver);
392 error = pci_create_newid_file(drv);
394 driver_unregister(&drv->driver);
400 * pci_unregister_driver - unregister a pci driver
401 * @drv: the driver structure to unregister
403 * Deletes the driver structure from the list of registered PCI drivers,
404 * gives it a chance to clean up by calling its remove() function for
405 * each device it was responsible for, and marks those devices as
410 pci_unregister_driver(struct pci_driver *drv)
412 pci_remove_newid_file(drv);
413 driver_unregister(&drv->driver);
414 pci_free_dynids(drv);
417 static struct pci_driver pci_compat_driver = {
422 * pci_dev_driver - get the pci_driver of a device
423 * @dev: the device to query
425 * Returns the appropriate pci_driver structure or %NULL if there is no
426 * registered driver for the device.
429 pci_dev_driver(const struct pci_dev *dev)
435 for(i=0; i<=PCI_ROM_RESOURCE; i++)
436 if (dev->resource[i].flags & IORESOURCE_BUSY)
437 return &pci_compat_driver;
443 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
444 * @dev: the PCI device structure to match against
445 * @drv: the device driver to search for matching PCI device id structures
447 * Used by a driver to check whether a PCI device present in the
448 * system is in its list of supported devices. Returns the matching
449 * pci_device_id structure or %NULL if there is no match.
451 static int pci_bus_match(struct device *dev, struct device_driver *drv)
453 struct pci_dev *pci_dev = to_pci_dev(dev);
454 struct pci_driver *pci_drv = to_pci_driver(drv);
455 const struct pci_device_id *found_id;
457 found_id = pci_match_device(pci_drv, pci_dev);
465 * pci_dev_get - increments the reference count of the pci device structure
466 * @dev: the device being referenced
468 * Each live reference to a device should be refcounted.
470 * Drivers for PCI devices should normally record such references in
471 * their probe() methods, when they bind to a device, and release
472 * them by calling pci_dev_put(), in their disconnect() methods.
474 * A pointer to the device with the incremented reference counter is returned.
476 struct pci_dev *pci_dev_get(struct pci_dev *dev)
479 get_device(&dev->dev);
484 * pci_dev_put - release a use of the pci device structure
485 * @dev: device that's been disconnected
487 * Must be called when a user of a device is finished with it. When the last
488 * user of the device calls this function, the memory of the device is freed.
490 void pci_dev_put(struct pci_dev *dev)
493 put_device(&dev->dev);
496 #ifndef CONFIG_HOTPLUG
497 int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
503 struct bus_type pci_bus_type = {
505 .match = pci_bus_match,
506 .uevent = pci_uevent,
507 .probe = pci_device_probe,
508 .remove = pci_device_remove,
509 .suspend = pci_device_suspend,
510 .suspend_late = pci_device_suspend_late,
511 .resume_early = pci_device_resume_early,
512 .resume = pci_device_resume,
513 .shutdown = pci_device_shutdown,
514 .dev_attrs = pci_dev_attrs,
517 static int __init pci_driver_init(void)
519 return bus_register(&pci_bus_type);
522 postcore_initcall(pci_driver_init);
524 EXPORT_SYMBOL(pci_match_id);
525 EXPORT_SYMBOL(__pci_register_driver);
526 EXPORT_SYMBOL(pci_unregister_driver);
527 EXPORT_SYMBOL(pci_dev_driver);
528 EXPORT_SYMBOL(pci_bus_type);
529 EXPORT_SYMBOL(pci_dev_get);
530 EXPORT_SYMBOL(pci_dev_put);