Commit | Line | Data |
---|---|---|
07e4a3e2 | 1 | /* |
4a3ad20c | 2 | * drivers/base/dd.c - The core device/driver interactions. |
07e4a3e2 | 3 | * |
4a3ad20c GKH |
4 | * This file contains the (sometimes tricky) code that controls the |
5 | * interactions between devices and drivers, which primarily includes | |
6 | * driver binding and unbinding. | |
07e4a3e2 | 7 | * |
4a3ad20c GKH |
8 | * All of this code used to exist in drivers/base/bus.c, but was |
9 | * relocated to here in the name of compartmentalization (since it wasn't | |
10 | * strictly code just for the 'struct bus_type'. | |
07e4a3e2 | 11 | * |
4a3ad20c GKH |
12 | * Copyright (c) 2002-5 Patrick Mochel |
13 | * Copyright (c) 2002-3 Open Source Development Labs | |
b4028437 GKH |
14 | * Copyright (c) 2007-2009 Greg Kroah-Hartman <gregkh@suse.de> |
15 | * Copyright (c) 2007-2009 Novell Inc. | |
07e4a3e2 | 16 | * |
4a3ad20c | 17 | * This file is released under the GPLv2 |
07e4a3e2 PM |
18 | */ |
19 | ||
20 | #include <linux/device.h> | |
216773a7 | 21 | #include <linux/delay.h> |
07e4a3e2 | 22 | #include <linux/module.h> |
d779249e | 23 | #include <linux/kthread.h> |
735a7ffb | 24 | #include <linux/wait.h> |
216773a7 | 25 | #include <linux/async.h> |
5e928f77 | 26 | #include <linux/pm_runtime.h> |
ab78029e | 27 | #include <linux/pinctrl/devinfo.h> |
07e4a3e2 PM |
28 | |
29 | #include "base.h" | |
30 | #include "power/power.h" | |
31 | ||
d1c3414c GL |
32 | /* |
33 | * Deferred Probe infrastructure. | |
34 | * | |
35 | * Sometimes driver probe order matters, but the kernel doesn't always have | |
36 | * dependency information which means some drivers will get probed before a | |
37 | * resource it depends on is available. For example, an SDHCI driver may | |
38 | * first need a GPIO line from an i2c GPIO controller before it can be | |
39 | * initialized. If a required resource is not available yet, a driver can | |
40 | * request probing to be deferred by returning -EPROBE_DEFER from its probe hook | |
41 | * | |
42 | * Deferred probe maintains two lists of devices, a pending list and an active | |
43 | * list. A driver returning -EPROBE_DEFER causes the device to be added to the | |
44 | * pending list. A successful driver probe will trigger moving all devices | |
45 | * from the pending to the active list so that the workqueue will eventually | |
46 | * retry them. | |
47 | * | |
48 | * The deferred_probe_mutex must be held any time the deferred_probe_*_list | |
ef8a3fd6 | 49 | * of the (struct device*)->p->deferred_probe pointers are manipulated |
d1c3414c GL |
50 | */ |
51 | static DEFINE_MUTEX(deferred_probe_mutex); | |
52 | static LIST_HEAD(deferred_probe_pending_list); | |
53 | static LIST_HEAD(deferred_probe_active_list); | |
54 | static struct workqueue_struct *deferred_wq; | |
55 | ||
56 | /** | |
57 | * deferred_probe_work_func() - Retry probing devices in the active list. | |
58 | */ | |
59 | static void deferred_probe_work_func(struct work_struct *work) | |
60 | { | |
61 | struct device *dev; | |
ef8a3fd6 | 62 | struct device_private *private; |
d1c3414c GL |
63 | /* |
64 | * This block processes every device in the deferred 'active' list. | |
65 | * Each device is removed from the active list and passed to | |
66 | * bus_probe_device() to re-attempt the probe. The loop continues | |
67 | * until every device in the active list is removed and retried. | |
68 | * | |
69 | * Note: Once the device is removed from the list and the mutex is | |
70 | * released, it is possible for the device get freed by another thread | |
71 | * and cause a illegal pointer dereference. This code uses | |
72 | * get/put_device() to ensure the device structure cannot disappear | |
73 | * from under our feet. | |
74 | */ | |
75 | mutex_lock(&deferred_probe_mutex); | |
76 | while (!list_empty(&deferred_probe_active_list)) { | |
ef8a3fd6 GKH |
77 | private = list_first_entry(&deferred_probe_active_list, |
78 | typeof(*dev->p), deferred_probe); | |
79 | dev = private->device; | |
80 | list_del_init(&private->deferred_probe); | |
d1c3414c GL |
81 | |
82 | get_device(dev); | |
83 | ||
8b0372a2 GKH |
84 | /* |
85 | * Drop the mutex while probing each device; the probe path may | |
86 | * manipulate the deferred list | |
87 | */ | |
d1c3414c | 88 | mutex_unlock(&deferred_probe_mutex); |
8153584e MB |
89 | |
90 | /* | |
91 | * Force the device to the end of the dpm_list since | |
92 | * the PM code assumes that the order we add things to | |
93 | * the list is a good order for suspend but deferred | |
94 | * probe makes that very unsafe. | |
95 | */ | |
96 | device_pm_lock(); | |
97 | device_pm_move_last(dev); | |
98 | device_pm_unlock(); | |
99 | ||
d1c3414c GL |
100 | dev_dbg(dev, "Retrying from deferred list\n"); |
101 | bus_probe_device(dev); | |
8153584e | 102 | |
d1c3414c GL |
103 | mutex_lock(&deferred_probe_mutex); |
104 | ||
105 | put_device(dev); | |
106 | } | |
107 | mutex_unlock(&deferred_probe_mutex); | |
108 | } | |
109 | static DECLARE_WORK(deferred_probe_work, deferred_probe_work_func); | |
110 | ||
111 | static void driver_deferred_probe_add(struct device *dev) | |
112 | { | |
113 | mutex_lock(&deferred_probe_mutex); | |
ef8a3fd6 | 114 | if (list_empty(&dev->p->deferred_probe)) { |
d1c3414c | 115 | dev_dbg(dev, "Added to deferred list\n"); |
1d29cfa5 | 116 | list_add_tail(&dev->p->deferred_probe, &deferred_probe_pending_list); |
d1c3414c GL |
117 | } |
118 | mutex_unlock(&deferred_probe_mutex); | |
119 | } | |
120 | ||
121 | void driver_deferred_probe_del(struct device *dev) | |
122 | { | |
123 | mutex_lock(&deferred_probe_mutex); | |
ef8a3fd6 | 124 | if (!list_empty(&dev->p->deferred_probe)) { |
d1c3414c | 125 | dev_dbg(dev, "Removed from deferred list\n"); |
ef8a3fd6 | 126 | list_del_init(&dev->p->deferred_probe); |
d1c3414c GL |
127 | } |
128 | mutex_unlock(&deferred_probe_mutex); | |
129 | } | |
130 | ||
131 | static bool driver_deferred_probe_enable = false; | |
132 | /** | |
133 | * driver_deferred_probe_trigger() - Kick off re-probing deferred devices | |
134 | * | |
135 | * This functions moves all devices from the pending list to the active | |
136 | * list and schedules the deferred probe workqueue to process them. It | |
137 | * should be called anytime a driver is successfully bound to a device. | |
138 | */ | |
139 | static void driver_deferred_probe_trigger(void) | |
140 | { | |
141 | if (!driver_deferred_probe_enable) | |
142 | return; | |
143 | ||
8b0372a2 GKH |
144 | /* |
145 | * A successful probe means that all the devices in the pending list | |
d1c3414c | 146 | * should be triggered to be reprobed. Move all the deferred devices |
8b0372a2 GKH |
147 | * into the active list so they can be retried by the workqueue |
148 | */ | |
d1c3414c GL |
149 | mutex_lock(&deferred_probe_mutex); |
150 | list_splice_tail_init(&deferred_probe_pending_list, | |
151 | &deferred_probe_active_list); | |
152 | mutex_unlock(&deferred_probe_mutex); | |
153 | ||
8b0372a2 GKH |
154 | /* |
155 | * Kick the re-probe thread. It may already be scheduled, but it is | |
156 | * safe to kick it again. | |
157 | */ | |
d1c3414c GL |
158 | queue_work(deferred_wq, &deferred_probe_work); |
159 | } | |
160 | ||
161 | /** | |
162 | * deferred_probe_initcall() - Enable probing of deferred devices | |
163 | * | |
164 | * We don't want to get in the way when the bulk of drivers are getting probed. | |
165 | * Instead, this initcall makes sure that deferred probing is delayed until | |
166 | * late_initcall time. | |
167 | */ | |
168 | static int deferred_probe_initcall(void) | |
169 | { | |
170 | deferred_wq = create_singlethread_workqueue("deferwq"); | |
171 | if (WARN_ON(!deferred_wq)) | |
172 | return -ENOMEM; | |
173 | ||
174 | driver_deferred_probe_enable = true; | |
175 | driver_deferred_probe_trigger(); | |
176 | return 0; | |
177 | } | |
178 | late_initcall(deferred_probe_initcall); | |
07e4a3e2 | 179 | |
1901fb26 | 180 | static void driver_bound(struct device *dev) |
07e4a3e2 | 181 | { |
8940b4f3 | 182 | if (klist_node_attached(&dev->p->knode_driver)) { |
f86db396 | 183 | printk(KERN_WARNING "%s: device %s already bound\n", |
2b3a302a | 184 | __func__, kobject_name(&dev->kobj)); |
1901fb26 | 185 | return; |
f86db396 | 186 | } |
4c898c7f | 187 | |
1e0b2cf9 | 188 | pr_debug("driver: '%s': %s: bound to device '%s'\n", dev_name(dev), |
2b3a302a | 189 | __func__, dev->driver->name); |
116af378 | 190 | |
fbb88fad SS |
191 | klist_add_tail(&dev->p->knode_driver, &dev->driver->p->klist_devices); |
192 | ||
8b0372a2 GKH |
193 | /* |
194 | * Make sure the device is no longer in one of the deferred lists and | |
195 | * kick off retrying all pending devices | |
196 | */ | |
d1c3414c GL |
197 | driver_deferred_probe_del(dev); |
198 | driver_deferred_probe_trigger(); | |
199 | ||
116af378 | 200 | if (dev->bus) |
c6f7e72a | 201 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 | 202 | BUS_NOTIFY_BOUND_DRIVER, dev); |
1901fb26 KS |
203 | } |
204 | ||
205 | static int driver_sysfs_add(struct device *dev) | |
206 | { | |
207 | int ret; | |
208 | ||
45daef0f MD |
209 | if (dev->bus) |
210 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
211 | BUS_NOTIFY_BIND_DRIVER, dev); | |
212 | ||
e5dd1278 | 213 | ret = sysfs_create_link(&dev->driver->p->kobj, &dev->kobj, |
07e4a3e2 | 214 | kobject_name(&dev->kobj)); |
f86db396 | 215 | if (ret == 0) { |
e5dd1278 | 216 | ret = sysfs_create_link(&dev->kobj, &dev->driver->p->kobj, |
f86db396 AM |
217 | "driver"); |
218 | if (ret) | |
e5dd1278 | 219 | sysfs_remove_link(&dev->driver->p->kobj, |
f86db396 AM |
220 | kobject_name(&dev->kobj)); |
221 | } | |
222 | return ret; | |
07e4a3e2 PM |
223 | } |
224 | ||
1901fb26 KS |
225 | static void driver_sysfs_remove(struct device *dev) |
226 | { | |
227 | struct device_driver *drv = dev->driver; | |
228 | ||
229 | if (drv) { | |
e5dd1278 | 230 | sysfs_remove_link(&drv->p->kobj, kobject_name(&dev->kobj)); |
1901fb26 KS |
231 | sysfs_remove_link(&dev->kobj, "driver"); |
232 | } | |
233 | } | |
234 | ||
235 | /** | |
4a3ad20c GKH |
236 | * device_bind_driver - bind a driver to one device. |
237 | * @dev: device. | |
1901fb26 | 238 | * |
4a3ad20c GKH |
239 | * Allow manual attachment of a driver to a device. |
240 | * Caller must have already set @dev->driver. | |
1901fb26 | 241 | * |
4a3ad20c GKH |
242 | * Note that this does not modify the bus reference count |
243 | * nor take the bus's rwsem. Please verify those are accounted | |
244 | * for before calling this. (It is ok to call with no other effort | |
245 | * from a driver's probe() method.) | |
1901fb26 | 246 | * |
8e9394ce | 247 | * This function must be called with the device lock held. |
1901fb26 KS |
248 | */ |
249 | int device_bind_driver(struct device *dev) | |
250 | { | |
cb986b74 CH |
251 | int ret; |
252 | ||
253 | ret = driver_sysfs_add(dev); | |
254 | if (!ret) | |
255 | driver_bound(dev); | |
256 | return ret; | |
1901fb26 | 257 | } |
4a3ad20c | 258 | EXPORT_SYMBOL_GPL(device_bind_driver); |
1901fb26 | 259 | |
d779249e | 260 | static atomic_t probe_count = ATOMIC_INIT(0); |
735a7ffb AM |
261 | static DECLARE_WAIT_QUEUE_HEAD(probe_waitqueue); |
262 | ||
21c7f30b | 263 | static int really_probe(struct device *dev, struct device_driver *drv) |
07e4a3e2 | 264 | { |
0d3e5a2e | 265 | int ret = 0; |
07e4a3e2 | 266 | |
d779249e | 267 | atomic_inc(&probe_count); |
7dc72b28 | 268 | pr_debug("bus: '%s': %s: probing driver %s with device %s\n", |
1e0b2cf9 | 269 | drv->bus->name, __func__, drv->name, dev_name(dev)); |
9ac7849e | 270 | WARN_ON(!list_empty(&dev->devres_head)); |
07e4a3e2 | 271 | |
07e4a3e2 | 272 | dev->driver = drv; |
ab78029e LW |
273 | |
274 | /* If using pinctrl, bind pins now before probing */ | |
275 | ret = pinctrl_bind_pins(dev); | |
276 | if (ret) | |
277 | goto probe_failed; | |
278 | ||
1901fb26 KS |
279 | if (driver_sysfs_add(dev)) { |
280 | printk(KERN_ERR "%s: driver_sysfs_add(%s) failed\n", | |
1e0b2cf9 | 281 | __func__, dev_name(dev)); |
1901fb26 KS |
282 | goto probe_failed; |
283 | } | |
284 | ||
594c8281 RK |
285 | if (dev->bus->probe) { |
286 | ret = dev->bus->probe(dev); | |
1901fb26 | 287 | if (ret) |
d779249e | 288 | goto probe_failed; |
594c8281 | 289 | } else if (drv->probe) { |
0d3e5a2e | 290 | ret = drv->probe(dev); |
1901fb26 | 291 | if (ret) |
d779249e | 292 | goto probe_failed; |
f86db396 | 293 | } |
1901fb26 KS |
294 | |
295 | driver_bound(dev); | |
0d3e5a2e | 296 | ret = 1; |
7dc72b28 | 297 | pr_debug("bus: '%s': %s: bound device %s to driver %s\n", |
1e0b2cf9 | 298 | drv->bus->name, __func__, dev_name(dev), drv->name); |
d779249e | 299 | goto done; |
0d3e5a2e | 300 | |
d779249e | 301 | probe_failed: |
9ac7849e | 302 | devres_release_all(dev); |
1901fb26 KS |
303 | driver_sysfs_remove(dev); |
304 | dev->driver = NULL; | |
0998d063 | 305 | dev_set_drvdata(dev, NULL); |
1901fb26 | 306 | |
d1c3414c GL |
307 | if (ret == -EPROBE_DEFER) { |
308 | /* Driver requested deferred probing */ | |
309 | dev_info(dev, "Driver %s requests probe deferral\n", drv->name); | |
310 | driver_deferred_probe_add(dev); | |
311 | } else if (ret != -ENODEV && ret != -ENXIO) { | |
0d3e5a2e PM |
312 | /* driver matched but the probe failed */ |
313 | printk(KERN_WARNING | |
314 | "%s: probe of %s failed with error %d\n", | |
1e0b2cf9 | 315 | drv->name, dev_name(dev), ret); |
bcbe4f94 WS |
316 | } else { |
317 | pr_debug("%s: probe of %s rejects match %d\n", | |
318 | drv->name, dev_name(dev), ret); | |
0d3e5a2e | 319 | } |
c578abbc CH |
320 | /* |
321 | * Ignore errors returned by ->probe so that the next driver can try | |
322 | * its luck. | |
323 | */ | |
324 | ret = 0; | |
d779249e | 325 | done: |
d779249e | 326 | atomic_dec(&probe_count); |
735a7ffb | 327 | wake_up(&probe_waitqueue); |
d779249e GKH |
328 | return ret; |
329 | } | |
330 | ||
331 | /** | |
332 | * driver_probe_done | |
333 | * Determine if the probe sequence is finished or not. | |
334 | * | |
335 | * Should somehow figure out how to use a semaphore, not an atomic variable... | |
336 | */ | |
337 | int driver_probe_done(void) | |
338 | { | |
2b3a302a | 339 | pr_debug("%s: probe_count = %d\n", __func__, |
d779249e GKH |
340 | atomic_read(&probe_count)); |
341 | if (atomic_read(&probe_count)) | |
342 | return -EBUSY; | |
343 | return 0; | |
344 | } | |
345 | ||
216773a7 AV |
346 | /** |
347 | * wait_for_device_probe | |
348 | * Wait for device probing to be completed. | |
216773a7 | 349 | */ |
b23530eb | 350 | void wait_for_device_probe(void) |
216773a7 AV |
351 | { |
352 | /* wait for the known devices to complete their probing */ | |
b23530eb | 353 | wait_event(probe_waitqueue, atomic_read(&probe_count) == 0); |
216773a7 | 354 | async_synchronize_full(); |
216773a7 | 355 | } |
d4d5291c | 356 | EXPORT_SYMBOL_GPL(wait_for_device_probe); |
216773a7 | 357 | |
d779249e GKH |
358 | /** |
359 | * driver_probe_device - attempt to bind device & driver together | |
360 | * @drv: driver to bind a device to | |
361 | * @dev: device to try to bind to the driver | |
362 | * | |
49b420a1 | 363 | * This function returns -ENODEV if the device is not registered, |
af901ca1 | 364 | * 1 if the device is bound successfully and 0 otherwise. |
d779249e | 365 | * |
8e9394ce GKH |
366 | * This function must be called with @dev lock held. When called for a |
367 | * USB interface, @dev->parent lock must be held as well. | |
d779249e | 368 | */ |
4a3ad20c | 369 | int driver_probe_device(struct device_driver *drv, struct device *dev) |
d779249e | 370 | { |
d779249e GKH |
371 | int ret = 0; |
372 | ||
f2eaae19 AS |
373 | if (!device_is_registered(dev)) |
374 | return -ENODEV; | |
d779249e | 375 | |
7dc72b28 | 376 | pr_debug("bus: '%s': %s: matched device %s with driver %s\n", |
1e0b2cf9 | 377 | drv->bus->name, __func__, dev_name(dev), drv->name); |
d779249e | 378 | |
5e928f77 | 379 | pm_runtime_barrier(dev); |
21c7f30b | 380 | ret = really_probe(dev, drv); |
eed5d215 | 381 | pm_runtime_idle(dev); |
d779249e | 382 | |
0d3e5a2e | 383 | return ret; |
07e4a3e2 PM |
384 | } |
385 | ||
4a3ad20c | 386 | static int __device_attach(struct device_driver *drv, void *data) |
2287c322 | 387 | { |
4a3ad20c | 388 | struct device *dev = data; |
49b420a1 ML |
389 | |
390 | if (!driver_match_device(drv, dev)) | |
391 | return 0; | |
392 | ||
0d3e5a2e | 393 | return driver_probe_device(drv, dev); |
2287c322 PM |
394 | } |
395 | ||
07e4a3e2 | 396 | /** |
4a3ad20c GKH |
397 | * device_attach - try to attach device to a driver. |
398 | * @dev: device. | |
07e4a3e2 | 399 | * |
4a3ad20c GKH |
400 | * Walk the list of drivers that the bus has and call |
401 | * driver_probe_device() for each pair. If a compatible | |
402 | * pair is found, break out and return. | |
0d3e5a2e | 403 | * |
4a3ad20c | 404 | * Returns 1 if the device was bound to a driver; |
59a3cd7f | 405 | * 0 if no matching driver was found; |
4a3ad20c | 406 | * -ENODEV if the device is not registered. |
bf74ad5b | 407 | * |
8e9394ce | 408 | * When called for a USB interface, @dev->parent lock must be held. |
07e4a3e2 | 409 | */ |
4a3ad20c | 410 | int device_attach(struct device *dev) |
07e4a3e2 | 411 | { |
0d3e5a2e PM |
412 | int ret = 0; |
413 | ||
8e9394ce | 414 | device_lock(dev); |
07e4a3e2 | 415 | if (dev->driver) { |
8497d6a2 SO |
416 | if (klist_node_attached(&dev->p->knode_driver)) { |
417 | ret = 1; | |
418 | goto out_unlock; | |
419 | } | |
f86db396 AM |
420 | ret = device_bind_driver(dev); |
421 | if (ret == 0) | |
422 | ret = 1; | |
c6a46696 CH |
423 | else { |
424 | dev->driver = NULL; | |
425 | ret = 0; | |
426 | } | |
21c7f30b | 427 | } else { |
5adc55da | 428 | ret = bus_for_each_drv(dev->bus, NULL, dev, __device_attach); |
eed5d215 | 429 | pm_runtime_idle(dev); |
21c7f30b | 430 | } |
8497d6a2 | 431 | out_unlock: |
8e9394ce | 432 | device_unlock(dev); |
0d3e5a2e | 433 | return ret; |
2287c322 | 434 | } |
4a3ad20c | 435 | EXPORT_SYMBOL_GPL(device_attach); |
2287c322 | 436 | |
4a3ad20c | 437 | static int __driver_attach(struct device *dev, void *data) |
2287c322 | 438 | { |
4a3ad20c | 439 | struct device_driver *drv = data; |
0d3e5a2e PM |
440 | |
441 | /* | |
442 | * Lock device and try to bind to it. We drop the error | |
443 | * here and always return 0, because we need to keep trying | |
444 | * to bind to devices and some drivers will return an error | |
445 | * simply if it didn't support the device. | |
446 | * | |
447 | * driver_probe_device() will spit a warning if there | |
448 | * is an error. | |
449 | */ | |
450 | ||
49b420a1 | 451 | if (!driver_match_device(drv, dev)) |
6cd49586 AV |
452 | return 0; |
453 | ||
bf74ad5b | 454 | if (dev->parent) /* Needed for USB */ |
8e9394ce GKH |
455 | device_lock(dev->parent); |
456 | device_lock(dev); | |
0d3e5a2e PM |
457 | if (!dev->driver) |
458 | driver_probe_device(drv, dev); | |
8e9394ce | 459 | device_unlock(dev); |
bf74ad5b | 460 | if (dev->parent) |
8e9394ce | 461 | device_unlock(dev->parent); |
0d3e5a2e | 462 | |
07e4a3e2 PM |
463 | return 0; |
464 | } | |
465 | ||
466 | /** | |
4a3ad20c GKH |
467 | * driver_attach - try to bind driver to devices. |
468 | * @drv: driver. | |
07e4a3e2 | 469 | * |
4a3ad20c GKH |
470 | * Walk the list of devices that the bus has on it and try to |
471 | * match the driver with each one. If driver_probe_device() | |
472 | * returns 0 and the @dev->driver is set, we've found a | |
473 | * compatible pair. | |
07e4a3e2 | 474 | */ |
4a3ad20c | 475 | int driver_attach(struct device_driver *drv) |
07e4a3e2 | 476 | { |
f86db396 | 477 | return bus_for_each_dev(drv->bus, NULL, drv, __driver_attach); |
07e4a3e2 | 478 | } |
4a3ad20c | 479 | EXPORT_SYMBOL_GPL(driver_attach); |
07e4a3e2 | 480 | |
ab71c6f0 | 481 | /* |
8e9394ce GKH |
482 | * __device_release_driver() must be called with @dev lock held. |
483 | * When called for a USB interface, @dev->parent lock must be held as well. | |
07e4a3e2 | 484 | */ |
4a3ad20c | 485 | static void __device_release_driver(struct device *dev) |
07e4a3e2 | 486 | { |
4a3ad20c | 487 | struct device_driver *drv; |
07e4a3e2 | 488 | |
ef2c5174 | 489 | drv = dev->driver; |
c95a6b05 | 490 | if (drv) { |
e1866b33 | 491 | pm_runtime_get_sync(dev); |
5e928f77 | 492 | |
1901fb26 | 493 | driver_sysfs_remove(dev); |
0d3e5a2e | 494 | |
116af378 | 495 | if (dev->bus) |
c6f7e72a | 496 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 BH |
497 | BUS_NOTIFY_UNBIND_DRIVER, |
498 | dev); | |
499 | ||
e1866b33 RW |
500 | pm_runtime_put_sync(dev); |
501 | ||
0f836ca4 | 502 | if (dev->bus && dev->bus->remove) |
594c8281 RK |
503 | dev->bus->remove(dev); |
504 | else if (drv->remove) | |
0d3e5a2e | 505 | drv->remove(dev); |
9ac7849e | 506 | devres_release_all(dev); |
0d3e5a2e | 507 | dev->driver = NULL; |
0998d063 | 508 | dev_set_drvdata(dev, NULL); |
8940b4f3 | 509 | klist_remove(&dev->p->knode_driver); |
309b7d60 JR |
510 | if (dev->bus) |
511 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
512 | BUS_NOTIFY_UNBOUND_DRIVER, | |
513 | dev); | |
5e928f77 | 514 | |
0d3e5a2e | 515 | } |
07e4a3e2 PM |
516 | } |
517 | ||
ab71c6f0 | 518 | /** |
4a3ad20c GKH |
519 | * device_release_driver - manually detach device from driver. |
520 | * @dev: device. | |
ab71c6f0 | 521 | * |
4a3ad20c | 522 | * Manually detach device from driver. |
8e9394ce | 523 | * When called for a USB interface, @dev->parent lock must be held. |
ab71c6f0 | 524 | */ |
4a3ad20c | 525 | void device_release_driver(struct device *dev) |
94e7b1c5 | 526 | { |
c95a6b05 AS |
527 | /* |
528 | * If anyone calls device_release_driver() recursively from | |
529 | * within their ->remove callback for the same device, they | |
530 | * will deadlock right here. | |
531 | */ | |
8e9394ce | 532 | device_lock(dev); |
c95a6b05 | 533 | __device_release_driver(dev); |
8e9394ce | 534 | device_unlock(dev); |
94e7b1c5 | 535 | } |
4a3ad20c | 536 | EXPORT_SYMBOL_GPL(device_release_driver); |
c95a6b05 | 537 | |
07e4a3e2 PM |
538 | /** |
539 | * driver_detach - detach driver from all devices it controls. | |
540 | * @drv: driver. | |
541 | */ | |
4a3ad20c | 542 | void driver_detach(struct device_driver *drv) |
07e4a3e2 | 543 | { |
8940b4f3 | 544 | struct device_private *dev_prv; |
4a3ad20c | 545 | struct device *dev; |
c95a6b05 AS |
546 | |
547 | for (;;) { | |
e5dd1278 GKH |
548 | spin_lock(&drv->p->klist_devices.k_lock); |
549 | if (list_empty(&drv->p->klist_devices.k_list)) { | |
550 | spin_unlock(&drv->p->klist_devices.k_lock); | |
c95a6b05 AS |
551 | break; |
552 | } | |
8940b4f3 GKH |
553 | dev_prv = list_entry(drv->p->klist_devices.k_list.prev, |
554 | struct device_private, | |
555 | knode_driver.n_node); | |
556 | dev = dev_prv->device; | |
c95a6b05 | 557 | get_device(dev); |
e5dd1278 | 558 | spin_unlock(&drv->p->klist_devices.k_lock); |
c95a6b05 | 559 | |
bf74ad5b | 560 | if (dev->parent) /* Needed for USB */ |
8e9394ce GKH |
561 | device_lock(dev->parent); |
562 | device_lock(dev); | |
c95a6b05 AS |
563 | if (dev->driver == drv) |
564 | __device_release_driver(dev); | |
8e9394ce | 565 | device_unlock(dev); |
bf74ad5b | 566 | if (dev->parent) |
8e9394ce | 567 | device_unlock(dev->parent); |
c95a6b05 AS |
568 | put_device(dev); |
569 | } | |
07e4a3e2 | 570 | } |
b4028437 GKH |
571 | |
572 | /* | |
573 | * These exports can't be _GPL due to .h files using this within them, and it | |
574 | * might break something that was previously working... | |
575 | */ | |
576 | void *dev_get_drvdata(const struct device *dev) | |
577 | { | |
578 | if (dev && dev->p) | |
579 | return dev->p->driver_data; | |
580 | return NULL; | |
581 | } | |
582 | EXPORT_SYMBOL(dev_get_drvdata); | |
583 | ||
c8705082 | 584 | int dev_set_drvdata(struct device *dev, void *data) |
b4028437 GKH |
585 | { |
586 | int error; | |
587 | ||
b4028437 GKH |
588 | if (!dev->p) { |
589 | error = device_private_init(dev); | |
590 | if (error) | |
c8705082 | 591 | return error; |
b4028437 GKH |
592 | } |
593 | dev->p->driver_data = data; | |
c8705082 | 594 | return 0; |
b4028437 GKH |
595 | } |
596 | EXPORT_SYMBOL(dev_set_drvdata); |