blob: 92d5e8db0de7b63f0c92a761551af5452db30673 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * drivers/pci/pci-driver.c
3 *
4 */
5
6#include <linux/pci.h>
7#include <linux/module.h>
8#include <linux/init.h>
9#include <linux/device.h>
Andi Kleend42c6992005-07-06 19:56:03 +020010#include <linux/mempolicy.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080011#include <linux/string.h>
12#include <linux/slab.h>
Tim Schmielau8c65b4a2005-11-07 00:59:43 -080013#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include "pci.h"
15
16/*
17 * Registration of PCI drivers and handling of hot-pluggable devices.
18 */
19
Greg Kroah-Hartman0f397f82006-07-18 10:59:59 -070020/* multithreaded probe logic */
21static int pci_multithread_probe =
22#ifdef CONFIG_PCI_MULTITHREAD_PROBE
23 1;
24#else
25 0;
26#endif
27__module_param_call("", pci_multithread_probe, param_set_bool, param_get_bool, &pci_multithread_probe, 0644);
28
29
Linus Torvalds1da177e2005-04-16 15:20:36 -070030/*
31 * Dynamic device IDs are disabled for !CONFIG_HOTPLUG
32 */
33
Greg Kroah-Hartman75865852005-06-30 02:18:12 -070034struct pci_dynid {
35 struct list_head node;
36 struct pci_device_id id;
37};
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Greg KH3d3c2ae2005-07-06 09:09:38 -070039#ifdef CONFIG_HOTPLUG
40
Linus Torvalds1da177e2005-04-16 15:20:36 -070041/**
Randy Dunlap8f7020d2005-10-23 11:57:38 -070042 * store_new_id - add a new PCI device ID to this driver and re-probe devices
43 * @driver: target device driver
44 * @buf: buffer for scanning device ID data
45 * @count: input size
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 *
47 * Adds a new dynamic pci device ID to this driver,
48 * and causes the driver to probe for all devices again.
49 */
Randy Dunlapf8eb1002005-10-28 20:36:51 -070050static ssize_t
Linus Torvalds1da177e2005-04-16 15:20:36 -070051store_new_id(struct device_driver *driver, const char *buf, size_t count)
52{
Greg Kroah-Hartman75865852005-06-30 02:18:12 -070053 struct pci_dynid *dynid;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 struct pci_driver *pdrv = to_pci_driver(driver);
55 __u32 vendor=PCI_ANY_ID, device=PCI_ANY_ID, subvendor=PCI_ANY_ID,
56 subdevice=PCI_ANY_ID, class=0, class_mask=0;
57 unsigned long driver_data=0;
58 int fields=0;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -070059 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
61 fields = sscanf(buf, "%x %x %x %x %x %x %lux",
62 &vendor, &device, &subvendor, &subdevice,
63 &class, &class_mask, &driver_data);
64 if (fields < 0)
65 return -EINVAL;
66
Eric Sesterhennf5afe802006-02-28 15:34:49 +010067 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 if (!dynid)
69 return -ENOMEM;
70
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 INIT_LIST_HEAD(&dynid->node);
72 dynid->id.vendor = vendor;
73 dynid->id.device = device;
74 dynid->id.subvendor = subvendor;
75 dynid->id.subdevice = subdevice;
76 dynid->id.class = class;
77 dynid->id.class_mask = class_mask;
78 dynid->id.driver_data = pdrv->dynids.use_driver_data ?
79 driver_data : 0UL;
80
81 spin_lock(&pdrv->dynids.lock);
82 list_add_tail(&pdrv->dynids.list, &dynid->node);
83 spin_unlock(&pdrv->dynids.lock);
84
Greg Kroah-Hartman75865852005-06-30 02:18:12 -070085 if (get_driver(&pdrv->driver)) {
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -070086 retval = driver_attach(&pdrv->driver);
Greg Kroah-Hartman75865852005-06-30 02:18:12 -070087 put_driver(&pdrv->driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 }
89
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -070090 if (retval)
91 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 return count;
93}
Linus Torvalds1da177e2005-04-16 15:20:36 -070094static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96static void
97pci_free_dynids(struct pci_driver *drv)
98{
Greg Kroah-Hartman75865852005-06-30 02:18:12 -070099 struct pci_dynid *dynid, *n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101 spin_lock(&drv->dynids.lock);
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700102 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 list_del(&dynid->node);
104 kfree(dynid);
105 }
106 spin_unlock(&drv->dynids.lock);
107}
108
109static int
110pci_create_newid_file(struct pci_driver *drv)
111{
112 int error = 0;
113 if (drv->probe != NULL)
114 error = sysfs_create_file(&drv->driver.kobj,
115 &driver_attr_new_id.attr);
116 return error;
117}
118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119#else /* !CONFIG_HOTPLUG */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120static inline void pci_free_dynids(struct pci_driver *drv) {}
121static inline int pci_create_newid_file(struct pci_driver *drv)
122{
123 return 0;
124}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125#endif
126
127/**
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700128 * pci_match_id - See if a pci device matches a given pci_id table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 * @ids: array of PCI device id structures to search in
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700130 * @dev: the PCI device structure to match against.
131 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 * Used by a driver to check whether a PCI device present in the
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700133 * system is in its list of supported devices. Returns the matching
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 * pci_device_id structure or %NULL if there is no match.
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700135 *
136 * Depreciated, don't use this as it will not catch any dynamic ids
137 * that a driver might want to check for.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 */
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700139const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
140 struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141{
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700142 if (ids) {
143 while (ids->vendor || ids->subvendor || ids->class_mask) {
144 if (pci_match_one_device(ids, dev))
145 return ids;
146 ids++;
147 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 }
149 return NULL;
150}
151
152/**
Randy Dunlapae9608a2007-01-09 21:41:01 -0800153 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700154 * @drv: the PCI driver to match against
Henrik Kretzschmar39ba4872006-08-15 10:57:16 +0200155 * @dev: the PCI device structure to match against
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700156 *
157 * Used by a driver to check whether a PCI device present in the
158 * system is in its list of supported devices. Returns the matching
159 * pci_device_id structure or %NULL if there is no match.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 */
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700161const struct pci_device_id *pci_match_device(struct pci_driver *drv,
162 struct pci_dev *dev)
163{
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700164 struct pci_dynid *dynid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
Russell King7461b602006-11-29 21:18:04 +0000166 /* Look at the dynamic ids first, before the static ones */
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700167 spin_lock(&drv->dynids.lock);
168 list_for_each_entry(dynid, &drv->dynids.list, node) {
169 if (pci_match_one_device(&dynid->id, dev)) {
170 spin_unlock(&drv->dynids.lock);
171 return &dynid->id;
172 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 }
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700174 spin_unlock(&drv->dynids.lock);
Russell King7461b602006-11-29 21:18:04 +0000175
176 return pci_match_id(drv->id_table, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177}
178
Andi Kleend42c6992005-07-06 19:56:03 +0200179static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
180 const struct pci_device_id *id)
181{
182 int error;
183#ifdef CONFIG_NUMA
184 /* Execute driver initialization on node where the
185 device's bus is attached to. This way the driver likely
186 allocates its local memory on the right node without
187 any need to change it. */
188 struct mempolicy *oldpol;
189 cpumask_t oldmask = current->cpus_allowed;
190 int node = pcibus_to_node(dev->bus);
191 if (node >= 0 && node_online(node))
192 set_cpus_allowed(current, node_to_cpumask(node));
193 /* And set default memory allocation policy */
194 oldpol = current->mempolicy;
195 current->mempolicy = &default_policy;
196 mpol_get(current->mempolicy);
197#endif
198 error = drv->probe(dev, id);
199#ifdef CONFIG_NUMA
200 set_cpus_allowed(current, oldmask);
201 mpol_free(current->mempolicy);
202 current->mempolicy = oldpol;
203#endif
204 return error;
205}
206
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207/**
208 * __pci_device_probe()
Randy Dunlap8f7020d2005-10-23 11:57:38 -0700209 * @drv: driver to call to check if it wants the PCI device
210 * @pci_dev: PCI device being probed
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 *
Randy Dunlap8f7020d2005-10-23 11:57:38 -0700212 * returns 0 on success, else error.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
214 */
215static int
216__pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700217{
218 const struct pci_device_id *id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 int error = 0;
220
221 if (!pci_dev->driver && drv->probe) {
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700222 error = -ENODEV;
223
224 id = pci_match_device(drv, pci_dev);
225 if (id)
Andi Kleend42c6992005-07-06 19:56:03 +0200226 error = pci_call_probe(drv, pci_dev, id);
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700227 if (error >= 0) {
228 pci_dev->driver = drv;
229 error = 0;
230 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 }
232 return error;
233}
234
235static int pci_device_probe(struct device * dev)
236{
237 int error = 0;
238 struct pci_driver *drv;
239 struct pci_dev *pci_dev;
240
241 drv = to_pci_driver(dev->driver);
242 pci_dev = to_pci_dev(dev);
243 pci_dev_get(pci_dev);
244 error = __pci_device_probe(drv, pci_dev);
245 if (error)
246 pci_dev_put(pci_dev);
247
248 return error;
249}
250
251static int pci_device_remove(struct device * dev)
252{
253 struct pci_dev * pci_dev = to_pci_dev(dev);
254 struct pci_driver * drv = pci_dev->driver;
255
256 if (drv) {
257 if (drv->remove)
258 drv->remove(pci_dev);
259 pci_dev->driver = NULL;
260 }
261
262 /*
Shaohua Li2449e062006-10-20 14:45:32 -0700263 * If the device is still on, set the power state as "unknown",
264 * since it might change by the next time we load the driver.
265 */
266 if (pci_dev->current_state == PCI_D0)
267 pci_dev->current_state = PCI_UNKNOWN;
268
269 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 * We would love to complain here if pci_dev->is_enabled is set, that
271 * the driver should have called pci_disable_device(), but the
272 * unfortunate fact is there are too many odd BIOS and bridge setups
273 * that don't like drivers doing that all of the time.
274 * Oh well, we can dream of sane hardware when we sleep, no matter how
275 * horrible the crap we have to deal with is when we are awake...
276 */
277
278 pci_dev_put(pci_dev);
279 return 0;
280}
281
282static int pci_device_suspend(struct device * dev, pm_message_t state)
283{
284 struct pci_dev * pci_dev = to_pci_dev(dev);
285 struct pci_driver * drv = pci_dev->driver;
286 int i = 0;
287
Andrew Morton02669492006-03-23 01:38:34 -0800288 if (drv && drv->suspend) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 i = drv->suspend(pci_dev, state);
Andrew Morton02669492006-03-23 01:38:34 -0800290 suspend_report_result(drv->suspend, i);
291 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 pci_save_state(pci_dev);
Shaohua Li2449e062006-10-20 14:45:32 -0700293 /*
294 * mark its power state as "unknown", since we don't know if
295 * e.g. the BIOS will change its device state when we suspend.
296 */
297 if (pci_dev->current_state == PCI_D0)
298 pci_dev->current_state = PCI_UNKNOWN;
Andrew Morton02669492006-03-23 01:38:34 -0800299 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 return i;
301}
302
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700303static int pci_device_suspend_late(struct device * dev, pm_message_t state)
304{
305 struct pci_dev * pci_dev = to_pci_dev(dev);
306 struct pci_driver * drv = pci_dev->driver;
307 int i = 0;
308
309 if (drv && drv->suspend_late) {
310 i = drv->suspend_late(pci_dev, state);
311 suspend_report_result(drv->suspend_late, i);
312 }
313 return i;
314}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
Greg Kroah-Hartman95a62962005-07-28 11:37:33 -0700316/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 * Default resume method for devices that have no driver provided resume,
318 * or not even a driver at all.
319 */
Jean Delvare8d92bc22006-04-18 14:49:56 +0200320static int pci_default_resume(struct pci_dev *pci_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321{
Jean Delvare8d92bc22006-04-18 14:49:56 +0200322 int retval = 0;
Greg Kroah-Hartman95a62962005-07-28 11:37:33 -0700323
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 /* restore the PCI config space */
325 pci_restore_state(pci_dev);
326 /* if the device was enabled before suspend, reenable */
Inaky Perez-Gonzalezbae94d02006-11-22 12:40:31 -0800327 if (atomic_read(&pci_dev->enable_cnt))
328 retval = __pci_enable_device(pci_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 /* if the device was busmaster before the suspend, make it busmaster again */
330 if (pci_dev->is_busmaster)
331 pci_set_master(pci_dev);
Jean Delvare8d92bc22006-04-18 14:49:56 +0200332
333 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334}
335
336static int pci_device_resume(struct device * dev)
337{
Jean Delvare8d92bc22006-04-18 14:49:56 +0200338 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 struct pci_dev * pci_dev = to_pci_dev(dev);
340 struct pci_driver * drv = pci_dev->driver;
341
342 if (drv && drv->resume)
Jean Delvare8d92bc22006-04-18 14:49:56 +0200343 error = drv->resume(pci_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 else
Jean Delvare8d92bc22006-04-18 14:49:56 +0200345 error = pci_default_resume(pci_dev);
346 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347}
348
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700349static int pci_device_resume_early(struct device * dev)
350{
351 int error = 0;
352 struct pci_dev * pci_dev = to_pci_dev(dev);
353 struct pci_driver * drv = pci_dev->driver;
354
Alan Cox1597cac2006-12-04 15:14:45 -0800355 pci_fixup_device(pci_fixup_resume, pci_dev);
356
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700357 if (drv && drv->resume_early)
358 error = drv->resume_early(pci_dev);
359 return error;
360}
361
Greg KHc8958172005-04-08 14:53:31 +0900362static void pci_device_shutdown(struct device *dev)
363{
364 struct pci_dev *pci_dev = to_pci_dev(dev);
365 struct pci_driver *drv = pci_dev->driver;
366
367 if (drv && drv->shutdown)
368 drv->shutdown(pci_dev);
369}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
371#define kobj_to_pci_driver(obj) container_of(obj, struct device_driver, kobj)
372#define attr_to_driver_attribute(obj) container_of(obj, struct driver_attribute, attr)
373
374static ssize_t
375pci_driver_attr_show(struct kobject * kobj, struct attribute *attr, char *buf)
376{
377 struct device_driver *driver = kobj_to_pci_driver(kobj);
378 struct driver_attribute *dattr = attr_to_driver_attribute(attr);
Dmitry Torokhovfc7e4822005-04-29 01:26:27 -0500379 ssize_t ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
Dmitry Torokhovfc7e4822005-04-29 01:26:27 -0500381 if (!get_driver(driver))
382 return -ENODEV;
383
384 ret = dattr->show ? dattr->show(driver, buf) : -EIO;
385
386 put_driver(driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 return ret;
388}
389
390static ssize_t
391pci_driver_attr_store(struct kobject * kobj, struct attribute *attr,
392 const char *buf, size_t count)
393{
394 struct device_driver *driver = kobj_to_pci_driver(kobj);
395 struct driver_attribute *dattr = attr_to_driver_attribute(attr);
Dmitry Torokhovfc7e4822005-04-29 01:26:27 -0500396 ssize_t ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
Dmitry Torokhovfc7e4822005-04-29 01:26:27 -0500398 if (!get_driver(driver))
399 return -ENODEV;
400
401 ret = dattr->store ? dattr->store(driver, buf, count) : -EIO;
402
403 put_driver(driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 return ret;
405}
406
407static struct sysfs_ops pci_driver_sysfs_ops = {
408 .show = pci_driver_attr_show,
409 .store = pci_driver_attr_store,
410};
411static struct kobj_type pci_driver_kobj_type = {
412 .sysfs_ops = &pci_driver_sysfs_ops,
413};
414
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415/**
Laurent riffard863b18f2005-10-27 23:12:54 +0200416 * __pci_register_driver - register a new pci driver
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 * @drv: the driver structure to register
Laurent riffard863b18f2005-10-27 23:12:54 +0200418 * @owner: owner module of drv
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 *
420 * Adds the driver structure to the list of registered drivers.
421 * Returns a negative value on error, otherwise 0.
Steven Coleeaae4b32005-05-03 18:38:30 -0600422 * If no error occurred, the driver remains registered even if
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 * no device was claimed during registration.
424 */
Laurent riffard863b18f2005-10-27 23:12:54 +0200425int __pci_register_driver(struct pci_driver *drv, struct module *owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426{
427 int error;
428
429 /* initialize common driver fields */
430 drv->driver.name = drv->name;
431 drv->driver.bus = &pci_bus_type;
Laurent riffard863b18f2005-10-27 23:12:54 +0200432 drv->driver.owner = owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 drv->driver.kobj.ktype = &pci_driver_kobj_type;
Alan Cox50b00752006-08-16 17:42:18 +0100434
435 if (pci_multithread_probe)
436 drv->driver.multithread_probe = pci_multithread_probe;
437 else
438 drv->driver.multithread_probe = drv->multithread_probe;
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700439
440 spin_lock_init(&drv->dynids.lock);
441 INIT_LIST_HEAD(&drv->dynids.list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
443 /* register with core */
444 error = driver_register(&drv->driver);
Akinobu Mita50bf14b2006-11-08 19:53:59 -0800445 if (error)
446 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
Akinobu Mita50bf14b2006-11-08 19:53:59 -0800448 error = pci_create_newid_file(drv);
449 if (error)
450 driver_unregister(&drv->driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451
452 return error;
453}
454
455/**
456 * pci_unregister_driver - unregister a pci driver
457 * @drv: the driver structure to unregister
458 *
459 * Deletes the driver structure from the list of registered PCI drivers,
460 * gives it a chance to clean up by calling its remove() function for
461 * each device it was responsible for, and marks those devices as
462 * driverless.
463 */
464
465void
466pci_unregister_driver(struct pci_driver *drv)
467{
468 driver_unregister(&drv->driver);
469 pci_free_dynids(drv);
470}
471
472static struct pci_driver pci_compat_driver = {
473 .name = "compat"
474};
475
476/**
477 * pci_dev_driver - get the pci_driver of a device
478 * @dev: the device to query
479 *
480 * Returns the appropriate pci_driver structure or %NULL if there is no
481 * registered driver for the device.
482 */
483struct pci_driver *
484pci_dev_driver(const struct pci_dev *dev)
485{
486 if (dev->driver)
487 return dev->driver;
488 else {
489 int i;
490 for(i=0; i<=PCI_ROM_RESOURCE; i++)
491 if (dev->resource[i].flags & IORESOURCE_BUSY)
492 return &pci_compat_driver;
493 }
494 return NULL;
495}
496
497/**
498 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 * @dev: the PCI device structure to match against
Randy Dunlap8f7020d2005-10-23 11:57:38 -0700500 * @drv: the device driver to search for matching PCI device id structures
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 *
502 * Used by a driver to check whether a PCI device present in the
Randy Dunlap8f7020d2005-10-23 11:57:38 -0700503 * system is in its list of supported devices. Returns the matching
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 * pci_device_id structure or %NULL if there is no match.
505 */
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700506static int pci_bus_match(struct device *dev, struct device_driver *drv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507{
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700508 struct pci_dev *pci_dev = to_pci_dev(dev);
509 struct pci_driver *pci_drv = to_pci_driver(drv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 const struct pci_device_id *found_id;
511
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700512 found_id = pci_match_device(pci_drv, pci_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 if (found_id)
514 return 1;
515
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700516 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517}
518
519/**
520 * pci_dev_get - increments the reference count of the pci device structure
521 * @dev: the device being referenced
522 *
523 * Each live reference to a device should be refcounted.
524 *
525 * Drivers for PCI devices should normally record such references in
526 * their probe() methods, when they bind to a device, and release
527 * them by calling pci_dev_put(), in their disconnect() methods.
528 *
529 * A pointer to the device with the incremented reference counter is returned.
530 */
531struct pci_dev *pci_dev_get(struct pci_dev *dev)
532{
533 if (dev)
534 get_device(&dev->dev);
535 return dev;
536}
537
538/**
539 * pci_dev_put - release a use of the pci device structure
540 * @dev: device that's been disconnected
541 *
542 * Must be called when a user of a device is finished with it. When the last
543 * user of the device calls this function, the memory of the device is freed.
544 */
545void pci_dev_put(struct pci_dev *dev)
546{
547 if (dev)
548 put_device(&dev->dev);
549}
550
551#ifndef CONFIG_HOTPLUG
Kay Sievers312c0042005-11-16 09:00:00 +0100552int pci_uevent(struct device *dev, char **envp, int num_envp,
553 char *buffer, int buffer_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554{
555 return -ENODEV;
556}
557#endif
558
559struct bus_type pci_bus_type = {
560 .name = "pci",
561 .match = pci_bus_match,
Kay Sievers312c0042005-11-16 09:00:00 +0100562 .uevent = pci_uevent,
Russell Kingb15d6862006-01-05 14:30:22 +0000563 .probe = pci_device_probe,
564 .remove = pci_device_remove,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 .suspend = pci_device_suspend,
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700566 .suspend_late = pci_device_suspend_late,
567 .resume_early = pci_device_resume_early,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 .resume = pci_device_resume,
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700569 .shutdown = pci_device_shutdown,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 .dev_attrs = pci_dev_attrs,
571};
572
573static int __init pci_driver_init(void)
574{
575 return bus_register(&pci_bus_type);
576}
577
578postcore_initcall(pci_driver_init);
579
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700580EXPORT_SYMBOL(pci_match_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581EXPORT_SYMBOL(pci_match_device);
Laurent riffard863b18f2005-10-27 23:12:54 +0200582EXPORT_SYMBOL(__pci_register_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583EXPORT_SYMBOL(pci_unregister_driver);
584EXPORT_SYMBOL(pci_dev_driver);
585EXPORT_SYMBOL(pci_bus_type);
586EXPORT_SYMBOL(pci_dev_get);
587EXPORT_SYMBOL(pci_dev_put);