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>
19 #include <linux/cpu.h>
23 * Dynamic device IDs are disabled for !CONFIG_HOTPLUG
27 struct list_head node;
28 struct pci_device_id id;
34 * store_new_id - add a new PCI device ID to this driver and re-probe devices
35 * @driver: target device driver
36 * @buf: buffer for scanning device ID data
39 * Adds a new dynamic pci device ID to this driver,
40 * and causes the driver to probe for all devices again.
43 store_new_id(struct device_driver *driver, const char *buf, size_t count)
45 struct pci_dynid *dynid;
46 struct pci_driver *pdrv = to_pci_driver(driver);
47 const struct pci_device_id *ids = pdrv->id_table;
48 __u32 vendor, device, subvendor=PCI_ANY_ID,
49 subdevice=PCI_ANY_ID, class=0, class_mask=0;
50 unsigned long driver_data=0;
54 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
55 &vendor, &device, &subvendor, &subdevice,
56 &class, &class_mask, &driver_data);
60 /* Only accept driver_data values that match an existing id_table
64 while (ids->vendor || ids->subvendor || ids->class_mask) {
65 if (driver_data == ids->driver_data) {
71 if (retval) /* No match */
75 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
79 dynid->id.vendor = vendor;
80 dynid->id.device = device;
81 dynid->id.subvendor = subvendor;
82 dynid->id.subdevice = subdevice;
83 dynid->id.class = class;
84 dynid->id.class_mask = class_mask;
85 dynid->id.driver_data = driver_data;
87 spin_lock(&pdrv->dynids.lock);
88 list_add_tail(&dynid->node, &pdrv->dynids.list);
89 spin_unlock(&pdrv->dynids.lock);
91 if (get_driver(&pdrv->driver)) {
92 retval = driver_attach(&pdrv->driver);
93 put_driver(&pdrv->driver);
100 static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
103 * store_remove_id - remove a PCI device ID from this driver
104 * @driver: target device driver
105 * @buf: buffer for scanning device ID data
108 * Removes a dynamic pci device ID to this driver.
111 store_remove_id(struct device_driver *driver, const char *buf, size_t count)
113 struct pci_dynid *dynid, *n;
114 struct pci_driver *pdrv = to_pci_driver(driver);
115 __u32 vendor, device, subvendor = PCI_ANY_ID,
116 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
118 int retval = -ENODEV;
120 fields = sscanf(buf, "%x %x %x %x %x %x",
121 &vendor, &device, &subvendor, &subdevice,
122 &class, &class_mask);
126 spin_lock(&pdrv->dynids.lock);
127 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
128 struct pci_device_id *id = &dynid->id;
129 if ((id->vendor == vendor) &&
130 (id->device == device) &&
131 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
132 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
133 !((id->class ^ class) & class_mask)) {
134 list_del(&dynid->node);
140 spin_unlock(&pdrv->dynids.lock);
146 static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
149 pci_free_dynids(struct pci_driver *drv)
151 struct pci_dynid *dynid, *n;
153 spin_lock(&drv->dynids.lock);
154 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
155 list_del(&dynid->node);
158 spin_unlock(&drv->dynids.lock);
162 pci_create_newid_file(struct pci_driver *drv)
165 if (drv->probe != NULL)
166 error = driver_create_file(&drv->driver, &driver_attr_new_id);
170 static void pci_remove_newid_file(struct pci_driver *drv)
172 driver_remove_file(&drv->driver, &driver_attr_new_id);
176 pci_create_removeid_file(struct pci_driver *drv)
179 if (drv->probe != NULL)
180 error = driver_create_file(&drv->driver,&driver_attr_remove_id);
184 static void pci_remove_removeid_file(struct pci_driver *drv)
186 driver_remove_file(&drv->driver, &driver_attr_remove_id);
188 #else /* !CONFIG_HOTPLUG */
189 static inline void pci_free_dynids(struct pci_driver *drv) {}
190 static inline int pci_create_newid_file(struct pci_driver *drv)
194 static inline void pci_remove_newid_file(struct pci_driver *drv) {}
195 static inline int pci_create_removeid_file(struct pci_driver *drv)
199 static inline void pci_remove_removeid_file(struct pci_driver *drv) {}
203 * pci_match_id - See if a pci device matches a given pci_id table
204 * @ids: array of PCI device id structures to search in
205 * @dev: the PCI device structure to match against.
207 * Used by a driver to check whether a PCI device present in the
208 * system is in its list of supported devices. Returns the matching
209 * pci_device_id structure or %NULL if there is no match.
211 * Deprecated, don't use this as it will not catch any dynamic ids
212 * that a driver might want to check for.
214 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
218 while (ids->vendor || ids->subvendor || ids->class_mask) {
219 if (pci_match_one_device(ids, dev))
228 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
229 * @drv: the PCI driver to match against
230 * @dev: the PCI device structure to match against
232 * Used by a driver to check whether a PCI device present in the
233 * system is in its list of supported devices. Returns the matching
234 * pci_device_id structure or %NULL if there is no match.
236 static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
239 struct pci_dynid *dynid;
241 /* Look at the dynamic ids first, before the static ones */
242 spin_lock(&drv->dynids.lock);
243 list_for_each_entry(dynid, &drv->dynids.list, node) {
244 if (pci_match_one_device(&dynid->id, dev)) {
245 spin_unlock(&drv->dynids.lock);
249 spin_unlock(&drv->dynids.lock);
251 return pci_match_id(drv->id_table, dev);
254 struct drv_dev_and_id {
255 struct pci_driver *drv;
257 const struct pci_device_id *id;
260 static long local_pci_probe(void *_ddi)
262 struct drv_dev_and_id *ddi = _ddi;
264 return ddi->drv->probe(ddi->dev, ddi->id);
267 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
268 const struct pci_device_id *id)
271 struct drv_dev_and_id ddi = { drv, dev, id };
273 /* Execute driver initialization on node where the device's
274 bus is attached to. This way the driver likely allocates
275 its local memory on the right node without any need to
277 node = dev_to_node(&dev->dev);
280 node_to_cpumask_ptr(nodecpumask, node);
283 cpu = cpumask_any_and(nodecpumask, cpu_online_mask);
284 if (cpu < nr_cpu_ids)
285 error = work_on_cpu(cpu, local_pci_probe, &ddi);
287 error = local_pci_probe(&ddi);
290 error = local_pci_probe(&ddi);
295 * __pci_device_probe()
296 * @drv: driver to call to check if it wants the PCI device
297 * @pci_dev: PCI device being probed
299 * returns 0 on success, else error.
300 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
303 __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
305 const struct pci_device_id *id;
308 if (!pci_dev->driver && drv->probe) {
311 id = pci_match_device(drv, pci_dev);
313 error = pci_call_probe(drv, pci_dev, id);
315 pci_dev->driver = drv;
322 static int pci_device_probe(struct device * dev)
325 struct pci_driver *drv;
326 struct pci_dev *pci_dev;
328 drv = to_pci_driver(dev->driver);
329 pci_dev = to_pci_dev(dev);
330 pci_dev_get(pci_dev);
331 error = __pci_device_probe(drv, pci_dev);
333 pci_dev_put(pci_dev);
338 static int pci_device_remove(struct device * dev)
340 struct pci_dev * pci_dev = to_pci_dev(dev);
341 struct pci_driver * drv = pci_dev->driver;
345 drv->remove(pci_dev);
346 pci_dev->driver = NULL;
350 * If the device is still on, set the power state as "unknown",
351 * since it might change by the next time we load the driver.
353 if (pci_dev->current_state == PCI_D0)
354 pci_dev->current_state = PCI_UNKNOWN;
357 * We would love to complain here if pci_dev->is_enabled is set, that
358 * the driver should have called pci_disable_device(), but the
359 * unfortunate fact is there are too many odd BIOS and bridge setups
360 * that don't like drivers doing that all of the time.
361 * Oh well, we can dream of sane hardware when we sleep, no matter how
362 * horrible the crap we have to deal with is when we are awake...
365 pci_dev_put(pci_dev);
369 static void pci_device_shutdown(struct device *dev)
371 struct pci_dev *pci_dev = to_pci_dev(dev);
372 struct pci_driver *drv = pci_dev->driver;
374 if (drv && drv->shutdown)
375 drv->shutdown(pci_dev);
376 pci_msi_shutdown(pci_dev);
377 pci_msix_shutdown(pci_dev);
380 #ifdef CONFIG_PM_SLEEP
383 * Default "suspend" method for devices that have no driver provided suspend,
384 * or not even a driver at all (second part).
386 static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
389 * mark its power state as "unknown", since we don't know if
390 * e.g. the BIOS will change its device state when we suspend.
392 if (pci_dev->current_state == PCI_D0)
393 pci_dev->current_state = PCI_UNKNOWN;
397 * Default "resume" method for devices that have no driver provided resume,
398 * or not even a driver at all (second part).
400 static int pci_pm_reenable_device(struct pci_dev *pci_dev)
404 /* if the device was enabled before suspend, reenable */
405 retval = pci_reenable_device(pci_dev);
407 * if the device was busmaster before the suspend, make it busmaster
410 if (pci_dev->is_busmaster)
411 pci_set_master(pci_dev);
416 static int pci_legacy_suspend(struct device *dev, pm_message_t state)
418 struct pci_dev * pci_dev = to_pci_dev(dev);
419 struct pci_driver * drv = pci_dev->driver;
422 if (drv && drv->suspend) {
423 pci_power_t prev = pci_dev->current_state;
425 pci_dev->state_saved = false;
427 i = drv->suspend(pci_dev, state);
428 suspend_report_result(drv->suspend, i);
432 if (pci_dev->state_saved)
435 if (pci_dev->current_state != PCI_D0
436 && pci_dev->current_state != PCI_UNKNOWN) {
437 WARN_ONCE(pci_dev->current_state != prev,
438 "PCI PM: Device state not saved by %pF\n",
444 pci_save_state(pci_dev);
446 * This is for compatibility with existing code with legacy PM support.
448 pci_pm_set_unknown_state(pci_dev);
451 pci_fixup_device(pci_fixup_suspend, pci_dev);
456 static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
458 struct pci_dev * pci_dev = to_pci_dev(dev);
459 struct pci_driver * drv = pci_dev->driver;
462 if (drv && drv->suspend_late) {
463 i = drv->suspend_late(pci_dev, state);
464 suspend_report_result(drv->suspend_late, i);
469 static int pci_legacy_resume_early(struct device *dev)
471 struct pci_dev * pci_dev = to_pci_dev(dev);
472 struct pci_driver * drv = pci_dev->driver;
474 return drv && drv->resume_early ?
475 drv->resume_early(pci_dev) : 0;
478 static int pci_legacy_resume(struct device *dev)
480 struct pci_dev * pci_dev = to_pci_dev(dev);
481 struct pci_driver * drv = pci_dev->driver;
483 pci_fixup_device(pci_fixup_resume, pci_dev);
485 return drv && drv->resume ?
486 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
489 /* Auxiliary functions used by the new power management framework */
491 static void pci_pm_default_resume_noirq(struct pci_dev *pci_dev)
493 pci_restore_standard_config(pci_dev);
494 pci_dev->state_saved = false;
495 pci_fixup_device(pci_fixup_resume_early, pci_dev);
498 static void pci_pm_default_resume(struct pci_dev *pci_dev)
500 pci_fixup_device(pci_fixup_resume, pci_dev);
502 if (!pci_is_bridge(pci_dev))
503 pci_enable_wake(pci_dev, PCI_D0, false);
506 static void pci_pm_default_suspend(struct pci_dev *pci_dev)
508 /* Disable non-bridge devices without PM support */
509 if (!pci_is_bridge(pci_dev))
510 pci_disable_enabled_device(pci_dev);
511 pci_save_state(pci_dev);
514 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
516 struct pci_driver *drv = pci_dev->driver;
517 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
518 || drv->resume_early);
521 * Legacy PM support is used by default, so warn if the new framework is
522 * supported as well. Drivers are supposed to support either the
523 * former, or the latter, but not both at the same time.
525 WARN_ON(ret && drv->driver.pm);
530 /* New power management framework */
532 static int pci_pm_prepare(struct device *dev)
534 struct device_driver *drv = dev->driver;
537 if (drv && drv->pm && drv->pm->prepare)
538 error = drv->pm->prepare(dev);
543 static void pci_pm_complete(struct device *dev)
545 struct device_driver *drv = dev->driver;
547 if (drv && drv->pm && drv->pm->complete)
548 drv->pm->complete(dev);
551 #ifdef CONFIG_SUSPEND
553 static int pci_pm_suspend(struct device *dev)
555 struct pci_dev *pci_dev = to_pci_dev(dev);
556 struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
558 if (pci_has_legacy_pm_support(pci_dev))
559 return pci_legacy_suspend(dev, PMSG_SUSPEND);
562 pci_pm_default_suspend(pci_dev);
566 pci_dev->state_saved = false;
569 pci_power_t prev = pci_dev->current_state;
572 error = pm->suspend(dev);
573 suspend_report_result(pm->suspend, error);
577 if (pci_dev->state_saved)
580 if (pci_dev->current_state != PCI_D0
581 && pci_dev->current_state != PCI_UNKNOWN) {
582 WARN_ONCE(pci_dev->current_state != prev,
583 "PCI PM: State of device not saved by %pF\n",
589 if (!pci_dev->state_saved) {
590 pci_save_state(pci_dev);
591 if (!pci_is_bridge(pci_dev))
592 pci_prepare_to_sleep(pci_dev);
596 pci_fixup_device(pci_fixup_suspend, pci_dev);
601 static int pci_pm_suspend_noirq(struct device *dev)
603 struct pci_dev *pci_dev = to_pci_dev(dev);
604 struct device_driver *drv = dev->driver;
607 if (pci_has_legacy_pm_support(pci_dev))
608 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
610 if (drv && drv->pm && drv->pm->suspend_noirq) {
611 error = drv->pm->suspend_noirq(dev);
612 suspend_report_result(drv->pm->suspend_noirq, error);
616 pci_pm_set_unknown_state(pci_dev);
621 static int pci_pm_resume_noirq(struct device *dev)
623 struct pci_dev *pci_dev = to_pci_dev(dev);
624 struct device_driver *drv = dev->driver;
627 pci_pm_default_resume_noirq(pci_dev);
629 if (pci_has_legacy_pm_support(pci_dev))
630 return pci_legacy_resume_early(dev);
632 if (drv && drv->pm && drv->pm->resume_noirq)
633 error = drv->pm->resume_noirq(dev);
638 static int pci_pm_resume(struct device *dev)
640 struct pci_dev *pci_dev = to_pci_dev(dev);
641 struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
645 * This is necessary for the suspend error path in which resume is
646 * called without restoring the standard config registers of the device.
648 if (pci_dev->state_saved)
649 pci_restore_standard_config(pci_dev);
651 if (pci_has_legacy_pm_support(pci_dev))
652 return pci_legacy_resume(dev);
654 pci_pm_default_resume(pci_dev);
658 error = pm->resume(dev);
660 pci_pm_reenable_device(pci_dev);
666 #else /* !CONFIG_SUSPEND */
668 #define pci_pm_suspend NULL
669 #define pci_pm_suspend_noirq NULL
670 #define pci_pm_resume NULL
671 #define pci_pm_resume_noirq NULL
673 #endif /* !CONFIG_SUSPEND */
675 #ifdef CONFIG_HIBERNATION
677 static int pci_pm_freeze(struct device *dev)
679 struct pci_dev *pci_dev = to_pci_dev(dev);
680 struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
682 if (pci_has_legacy_pm_support(pci_dev))
683 return pci_legacy_suspend(dev, PMSG_FREEZE);
686 pci_pm_default_suspend(pci_dev);
690 pci_dev->state_saved = false;
695 error = pm->freeze(dev);
696 suspend_report_result(pm->freeze, error);
701 if (!pci_dev->state_saved)
702 pci_save_state(pci_dev);
707 static int pci_pm_freeze_noirq(struct device *dev)
709 struct pci_dev *pci_dev = to_pci_dev(dev);
710 struct device_driver *drv = dev->driver;
713 if (pci_has_legacy_pm_support(pci_dev))
714 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
716 if (drv && drv->pm && drv->pm->freeze_noirq) {
717 error = drv->pm->freeze_noirq(dev);
718 suspend_report_result(drv->pm->freeze_noirq, error);
722 pci_pm_set_unknown_state(pci_dev);
727 static int pci_pm_thaw_noirq(struct device *dev)
729 struct pci_dev *pci_dev = to_pci_dev(dev);
730 struct device_driver *drv = dev->driver;
733 if (pci_has_legacy_pm_support(pci_dev))
734 return pci_legacy_resume_early(dev);
736 pci_update_current_state(pci_dev, PCI_D0);
738 if (drv && drv->pm && drv->pm->thaw_noirq)
739 error = drv->pm->thaw_noirq(dev);
744 static int pci_pm_thaw(struct device *dev)
746 struct pci_dev *pci_dev = to_pci_dev(dev);
747 struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
750 if (pci_has_legacy_pm_support(pci_dev))
751 return pci_legacy_resume(dev);
755 error = pm->thaw(dev);
757 pci_pm_reenable_device(pci_dev);
763 static int pci_pm_poweroff(struct device *dev)
765 struct pci_dev *pci_dev = to_pci_dev(dev);
766 struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
769 if (pci_has_legacy_pm_support(pci_dev))
770 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
773 pci_pm_default_suspend(pci_dev);
777 pci_dev->state_saved = false;
780 error = pm->poweroff(dev);
781 suspend_report_result(pm->poweroff, error);
784 if (!pci_dev->state_saved && !pci_is_bridge(pci_dev))
785 pci_prepare_to_sleep(pci_dev);
788 pci_fixup_device(pci_fixup_suspend, pci_dev);
793 static int pci_pm_poweroff_noirq(struct device *dev)
795 struct device_driver *drv = dev->driver;
798 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
799 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
801 if (drv && drv->pm && drv->pm->poweroff_noirq) {
802 error = drv->pm->poweroff_noirq(dev);
803 suspend_report_result(drv->pm->poweroff_noirq, error);
809 static int pci_pm_restore_noirq(struct device *dev)
811 struct pci_dev *pci_dev = to_pci_dev(dev);
812 struct device_driver *drv = dev->driver;
815 pci_pm_default_resume_noirq(pci_dev);
817 if (pci_has_legacy_pm_support(pci_dev))
818 return pci_legacy_resume_early(dev);
820 if (drv && drv->pm && drv->pm->restore_noirq)
821 error = drv->pm->restore_noirq(dev);
826 static int pci_pm_restore(struct device *dev)
828 struct pci_dev *pci_dev = to_pci_dev(dev);
829 struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
833 * This is necessary for the hibernation error path in which restore is
834 * called without restoring the standard config registers of the device.
836 if (pci_dev->state_saved)
837 pci_restore_standard_config(pci_dev);
839 if (pci_has_legacy_pm_support(pci_dev))
840 return pci_legacy_resume(dev);
842 pci_pm_default_resume(pci_dev);
846 error = pm->restore(dev);
848 pci_pm_reenable_device(pci_dev);
854 #else /* !CONFIG_HIBERNATION */
856 #define pci_pm_freeze NULL
857 #define pci_pm_freeze_noirq NULL
858 #define pci_pm_thaw NULL
859 #define pci_pm_thaw_noirq NULL
860 #define pci_pm_poweroff NULL
861 #define pci_pm_poweroff_noirq NULL
862 #define pci_pm_restore NULL
863 #define pci_pm_restore_noirq NULL
865 #endif /* !CONFIG_HIBERNATION */
867 struct dev_pm_ops pci_dev_pm_ops = {
868 .prepare = pci_pm_prepare,
869 .complete = pci_pm_complete,
870 .suspend = pci_pm_suspend,
871 .resume = pci_pm_resume,
872 .freeze = pci_pm_freeze,
874 .poweroff = pci_pm_poweroff,
875 .restore = pci_pm_restore,
876 .suspend_noirq = pci_pm_suspend_noirq,
877 .resume_noirq = pci_pm_resume_noirq,
878 .freeze_noirq = pci_pm_freeze_noirq,
879 .thaw_noirq = pci_pm_thaw_noirq,
880 .poweroff_noirq = pci_pm_poweroff_noirq,
881 .restore_noirq = pci_pm_restore_noirq,
884 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
886 #else /* !CONFIG_PM_SLEEP */
888 #define PCI_PM_OPS_PTR NULL
890 #endif /* !CONFIG_PM_SLEEP */
893 * __pci_register_driver - register a new pci driver
894 * @drv: the driver structure to register
895 * @owner: owner module of drv
896 * @mod_name: module name string
898 * Adds the driver structure to the list of registered drivers.
899 * Returns a negative value on error, otherwise 0.
900 * If no error occurred, the driver remains registered even if
901 * no device was claimed during registration.
903 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
904 const char *mod_name)
908 /* initialize common driver fields */
909 drv->driver.name = drv->name;
910 drv->driver.bus = &pci_bus_type;
911 drv->driver.owner = owner;
912 drv->driver.mod_name = mod_name;
914 spin_lock_init(&drv->dynids.lock);
915 INIT_LIST_HEAD(&drv->dynids.list);
917 /* register with core */
918 error = driver_register(&drv->driver);
922 error = pci_create_newid_file(drv);
926 error = pci_create_removeid_file(drv);
933 pci_remove_newid_file(drv);
935 driver_unregister(&drv->driver);
940 * pci_unregister_driver - unregister a pci driver
941 * @drv: the driver structure to unregister
943 * Deletes the driver structure from the list of registered PCI drivers,
944 * gives it a chance to clean up by calling its remove() function for
945 * each device it was responsible for, and marks those devices as
950 pci_unregister_driver(struct pci_driver *drv)
952 pci_remove_removeid_file(drv);
953 pci_remove_newid_file(drv);
954 driver_unregister(&drv->driver);
955 pci_free_dynids(drv);
958 static struct pci_driver pci_compat_driver = {
963 * pci_dev_driver - get the pci_driver of a device
964 * @dev: the device to query
966 * Returns the appropriate pci_driver structure or %NULL if there is no
967 * registered driver for the device.
970 pci_dev_driver(const struct pci_dev *dev)
976 for(i=0; i<=PCI_ROM_RESOURCE; i++)
977 if (dev->resource[i].flags & IORESOURCE_BUSY)
978 return &pci_compat_driver;
984 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
985 * @dev: the PCI device structure to match against
986 * @drv: the device driver to search for matching PCI device id structures
988 * Used by a driver to check whether a PCI device present in the
989 * system is in its list of supported devices. Returns the matching
990 * pci_device_id structure or %NULL if there is no match.
992 static int pci_bus_match(struct device *dev, struct device_driver *drv)
994 struct pci_dev *pci_dev = to_pci_dev(dev);
995 struct pci_driver *pci_drv = to_pci_driver(drv);
996 const struct pci_device_id *found_id;
998 found_id = pci_match_device(pci_drv, pci_dev);
1006 * pci_dev_get - increments the reference count of the pci device structure
1007 * @dev: the device being referenced
1009 * Each live reference to a device should be refcounted.
1011 * Drivers for PCI devices should normally record such references in
1012 * their probe() methods, when they bind to a device, and release
1013 * them by calling pci_dev_put(), in their disconnect() methods.
1015 * A pointer to the device with the incremented reference counter is returned.
1017 struct pci_dev *pci_dev_get(struct pci_dev *dev)
1020 get_device(&dev->dev);
1025 * pci_dev_put - release a use of the pci device structure
1026 * @dev: device that's been disconnected
1028 * Must be called when a user of a device is finished with it. When the last
1029 * user of the device calls this function, the memory of the device is freed.
1031 void pci_dev_put(struct pci_dev *dev)
1034 put_device(&dev->dev);
1037 #ifndef CONFIG_HOTPLUG
1038 int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1044 struct bus_type pci_bus_type = {
1046 .match = pci_bus_match,
1047 .uevent = pci_uevent,
1048 .probe = pci_device_probe,
1049 .remove = pci_device_remove,
1050 .shutdown = pci_device_shutdown,
1051 .dev_attrs = pci_dev_attrs,
1052 .bus_attrs = pci_bus_attrs,
1053 .pm = PCI_PM_OPS_PTR,
1056 static int __init pci_driver_init(void)
1058 return bus_register(&pci_bus_type);
1061 postcore_initcall(pci_driver_init);
1063 EXPORT_SYMBOL(pci_match_id);
1064 EXPORT_SYMBOL(__pci_register_driver);
1065 EXPORT_SYMBOL(pci_unregister_driver);
1066 EXPORT_SYMBOL(pci_dev_driver);
1067 EXPORT_SYMBOL(pci_bus_type);
1068 EXPORT_SYMBOL(pci_dev_get);
1069 EXPORT_SYMBOL(pci_dev_put);