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1da177e4 LT |
1 | /* |
2 | * drivers/usb/usb.c | |
3 | * | |
4 | * (C) Copyright Linus Torvalds 1999 | |
5 | * (C) Copyright Johannes Erdfelt 1999-2001 | |
6 | * (C) Copyright Andreas Gal 1999 | |
7 | * (C) Copyright Gregory P. Smith 1999 | |
8 | * (C) Copyright Deti Fliegl 1999 (new USB architecture) | |
9 | * (C) Copyright Randy Dunlap 2000 | |
10 | * (C) Copyright David Brownell 2000-2004 | |
11 | * (C) Copyright Yggdrasil Computing, Inc. 2000 | |
12 | * (usb_device_id matching changes by Adam J. Richter) | |
13 | * (C) Copyright Greg Kroah-Hartman 2002-2003 | |
14 | * | |
15 | * NOTE! This is not actually a driver at all, rather this is | |
16 | * just a collection of helper routines that implement the | |
17 | * generic USB things that the real drivers can use.. | |
18 | * | |
19 | * Think of this as a "USB library" rather than anything else. | |
20 | * It should be considered a slave, with no callbacks. Callbacks | |
21 | * are evil. | |
22 | */ | |
23 | ||
24 | #include <linux/config.h> | |
1da177e4 LT |
25 | #include <linux/module.h> |
26 | #include <linux/string.h> | |
27 | #include <linux/bitops.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/interrupt.h> /* for in_interrupt() */ | |
30 | #include <linux/kmod.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/spinlock.h> | |
33 | #include <linux/errno.h> | |
34 | #include <linux/smp_lock.h> | |
35 | #include <linux/rwsem.h> | |
36 | #include <linux/usb.h> | |
37 | ||
38 | #include <asm/io.h> | |
39 | #include <asm/scatterlist.h> | |
40 | #include <linux/mm.h> | |
41 | #include <linux/dma-mapping.h> | |
42 | ||
43 | #include "hcd.h" | |
44 | #include "usb.h" | |
45 | ||
1da177e4 LT |
46 | |
47 | const char *usbcore_name = "usbcore"; | |
48 | ||
49 | static int nousb; /* Disable USB when built into kernel image */ | |
50 | /* Not honored on modular build */ | |
51 | ||
52 | static DECLARE_RWSEM(usb_all_devices_rwsem); | |
53 | ||
54 | ||
1da177e4 LT |
55 | /** |
56 | * usb_ifnum_to_if - get the interface object with a given interface number | |
57 | * @dev: the device whose current configuration is considered | |
58 | * @ifnum: the desired interface | |
59 | * | |
60 | * This walks the device descriptor for the currently active configuration | |
61 | * and returns a pointer to the interface with that particular interface | |
62 | * number, or null. | |
63 | * | |
64 | * Note that configuration descriptors are not required to assign interface | |
65 | * numbers sequentially, so that it would be incorrect to assume that | |
66 | * the first interface in that descriptor corresponds to interface zero. | |
67 | * This routine helps device drivers avoid such mistakes. | |
68 | * However, you should make sure that you do the right thing with any | |
69 | * alternate settings available for this interfaces. | |
70 | * | |
71 | * Don't call this function unless you are bound to one of the interfaces | |
72 | * on this device or you have locked the device! | |
73 | */ | |
74 | struct usb_interface *usb_ifnum_to_if(struct usb_device *dev, unsigned ifnum) | |
75 | { | |
76 | struct usb_host_config *config = dev->actconfig; | |
77 | int i; | |
78 | ||
79 | if (!config) | |
80 | return NULL; | |
81 | for (i = 0; i < config->desc.bNumInterfaces; i++) | |
82 | if (config->interface[i]->altsetting[0] | |
83 | .desc.bInterfaceNumber == ifnum) | |
84 | return config->interface[i]; | |
85 | ||
86 | return NULL; | |
87 | } | |
88 | ||
89 | /** | |
90 | * usb_altnum_to_altsetting - get the altsetting structure with a given | |
91 | * alternate setting number. | |
92 | * @intf: the interface containing the altsetting in question | |
93 | * @altnum: the desired alternate setting number | |
94 | * | |
95 | * This searches the altsetting array of the specified interface for | |
96 | * an entry with the correct bAlternateSetting value and returns a pointer | |
97 | * to that entry, or null. | |
98 | * | |
99 | * Note that altsettings need not be stored sequentially by number, so | |
100 | * it would be incorrect to assume that the first altsetting entry in | |
101 | * the array corresponds to altsetting zero. This routine helps device | |
102 | * drivers avoid such mistakes. | |
103 | * | |
104 | * Don't call this function unless you are bound to the intf interface | |
105 | * or you have locked the device! | |
106 | */ | |
107 | struct usb_host_interface *usb_altnum_to_altsetting(struct usb_interface *intf, | |
108 | unsigned int altnum) | |
109 | { | |
110 | int i; | |
111 | ||
112 | for (i = 0; i < intf->num_altsetting; i++) { | |
113 | if (intf->altsetting[i].desc.bAlternateSetting == altnum) | |
114 | return &intf->altsetting[i]; | |
115 | } | |
116 | return NULL; | |
117 | } | |
118 | ||
119 | /** | |
120 | * usb_driver_claim_interface - bind a driver to an interface | |
121 | * @driver: the driver to be bound | |
122 | * @iface: the interface to which it will be bound; must be in the | |
123 | * usb device's active configuration | |
124 | * @priv: driver data associated with that interface | |
125 | * | |
126 | * This is used by usb device drivers that need to claim more than one | |
127 | * interface on a device when probing (audio and acm are current examples). | |
128 | * No device driver should directly modify internal usb_interface or | |
129 | * usb_device structure members. | |
130 | * | |
131 | * Few drivers should need to use this routine, since the most natural | |
132 | * way to bind to an interface is to return the private data from | |
133 | * the driver's probe() method. | |
134 | * | |
135 | * Callers must own the device lock and the driver model's usb_bus_type.subsys | |
136 | * writelock. So driver probe() entries don't need extra locking, | |
137 | * but other call contexts may need to explicitly claim those locks. | |
138 | */ | |
139 | int usb_driver_claim_interface(struct usb_driver *driver, | |
140 | struct usb_interface *iface, void* priv) | |
141 | { | |
142 | struct device *dev = &iface->dev; | |
143 | ||
144 | if (dev->driver) | |
145 | return -EBUSY; | |
146 | ||
147 | dev->driver = &driver->driver; | |
148 | usb_set_intfdata(iface, priv); | |
149 | iface->condition = USB_INTERFACE_BOUND; | |
db690874 | 150 | mark_active(iface); |
1da177e4 LT |
151 | |
152 | /* if interface was already added, bind now; else let | |
153 | * the future device_add() bind it, bypassing probe() | |
154 | */ | |
d305ef5d | 155 | if (device_is_registered(dev)) |
1da177e4 LT |
156 | device_bind_driver(dev); |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | /** | |
162 | * usb_driver_release_interface - unbind a driver from an interface | |
163 | * @driver: the driver to be unbound | |
164 | * @iface: the interface from which it will be unbound | |
165 | * | |
166 | * This can be used by drivers to release an interface without waiting | |
167 | * for their disconnect() methods to be called. In typical cases this | |
168 | * also causes the driver disconnect() method to be called. | |
169 | * | |
170 | * This call is synchronous, and may not be used in an interrupt context. | |
171 | * Callers must own the device lock and the driver model's usb_bus_type.subsys | |
172 | * writelock. So driver disconnect() entries don't need extra locking, | |
173 | * but other call contexts may need to explicitly claim those locks. | |
174 | */ | |
175 | void usb_driver_release_interface(struct usb_driver *driver, | |
176 | struct usb_interface *iface) | |
177 | { | |
178 | struct device *dev = &iface->dev; | |
179 | ||
180 | /* this should never happen, don't release something that's not ours */ | |
181 | if (!dev->driver || dev->driver != &driver->driver) | |
182 | return; | |
183 | ||
f4096618 AS |
184 | /* don't release from within disconnect() */ |
185 | if (iface->condition != USB_INTERFACE_BOUND) | |
186 | return; | |
187 | ||
d305ef5d DR |
188 | /* don't release if the interface hasn't been added yet */ |
189 | if (device_is_registered(dev)) { | |
f4096618 | 190 | iface->condition = USB_INTERFACE_UNBINDING; |
1da177e4 | 191 | device_release_driver(dev); |
f4096618 | 192 | } |
1da177e4 LT |
193 | |
194 | dev->driver = NULL; | |
195 | usb_set_intfdata(iface, NULL); | |
196 | iface->condition = USB_INTERFACE_UNBOUND; | |
db690874 | 197 | mark_quiesced(iface); |
1da177e4 LT |
198 | } |
199 | ||
6034a080 PM |
200 | static int __find_interface(struct device * dev, void * data) |
201 | { | |
202 | struct usb_interface ** ret = (struct usb_interface **)data; | |
203 | struct usb_interface * intf = *ret; | |
204 | int *minor = (int *)data; | |
205 | ||
206 | /* can't look at usb devices, only interfaces */ | |
207 | if (dev->driver == &usb_generic_driver) | |
208 | return 0; | |
209 | ||
210 | intf = to_usb_interface(dev); | |
211 | if (intf->minor != -1 && intf->minor == *minor) { | |
212 | *ret = intf; | |
213 | return 1; | |
214 | } | |
215 | return 0; | |
216 | } | |
217 | ||
1da177e4 LT |
218 | /** |
219 | * usb_find_interface - find usb_interface pointer for driver and device | |
220 | * @drv: the driver whose current configuration is considered | |
221 | * @minor: the minor number of the desired device | |
222 | * | |
223 | * This walks the driver device list and returns a pointer to the interface | |
224 | * with the matching minor. Note, this only works for devices that share the | |
225 | * USB major number. | |
226 | */ | |
227 | struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor) | |
228 | { | |
ff710710 | 229 | struct usb_interface *intf = (struct usb_interface *)(long)minor; |
6034a080 | 230 | int ret; |
1da177e4 | 231 | |
6034a080 | 232 | ret = driver_for_each_device(&drv->driver, NULL, &intf, __find_interface); |
1da177e4 | 233 | |
6034a080 | 234 | return ret ? intf : NULL; |
1da177e4 LT |
235 | } |
236 | ||
1da177e4 LT |
237 | #ifdef CONFIG_HOTPLUG |
238 | ||
239 | /* | |
240 | * USB hotplugging invokes what /proc/sys/kernel/hotplug says | |
241 | * (normally /sbin/hotplug) when USB devices get added or removed. | |
242 | * | |
243 | * This invokes a user mode policy agent, typically helping to load driver | |
244 | * or other modules, configure the device, and more. Drivers can provide | |
245 | * a MODULE_DEVICE_TABLE to help with module loading subtasks. | |
246 | * | |
247 | * We're called either from khubd (the typical case) or from root hub | |
248 | * (init, kapmd, modprobe, rmmod, etc), but the agents need to handle | |
249 | * delays in event delivery. Use sysfs (and DEVPATH) to make sure the | |
250 | * device (and this configuration!) are still present. | |
251 | */ | |
252 | static int usb_hotplug (struct device *dev, char **envp, int num_envp, | |
253 | char *buffer, int buffer_size) | |
254 | { | |
255 | struct usb_interface *intf; | |
256 | struct usb_device *usb_dev; | |
7521803d | 257 | struct usb_host_interface *alt; |
1da177e4 LT |
258 | int i = 0; |
259 | int length = 0; | |
260 | ||
261 | if (!dev) | |
262 | return -ENODEV; | |
263 | ||
264 | /* driver is often null here; dev_dbg() would oops */ | |
265 | pr_debug ("usb %s: hotplug\n", dev->bus_id); | |
266 | ||
267 | /* Must check driver_data here, as on remove driver is always NULL */ | |
268 | if ((dev->driver == &usb_generic_driver) || | |
269 | (dev->driver_data == &usb_generic_driver_data)) | |
270 | return 0; | |
271 | ||
272 | intf = to_usb_interface(dev); | |
273 | usb_dev = interface_to_usbdev (intf); | |
7521803d GKH |
274 | alt = intf->cur_altsetting; |
275 | ||
1da177e4 LT |
276 | if (usb_dev->devnum < 0) { |
277 | pr_debug ("usb %s: already deleted?\n", dev->bus_id); | |
278 | return -ENODEV; | |
279 | } | |
280 | if (!usb_dev->bus) { | |
281 | pr_debug ("usb %s: bus removed?\n", dev->bus_id); | |
282 | return -ENODEV; | |
283 | } | |
284 | ||
285 | #ifdef CONFIG_USB_DEVICEFS | |
286 | /* If this is available, userspace programs can directly read | |
287 | * all the device descriptors we don't tell them about. Or | |
288 | * even act as usermode drivers. | |
289 | * | |
290 | * FIXME reduce hardwired intelligence here | |
291 | */ | |
292 | if (add_hotplug_env_var(envp, num_envp, &i, | |
293 | buffer, buffer_size, &length, | |
294 | "DEVICE=/proc/bus/usb/%03d/%03d", | |
295 | usb_dev->bus->busnum, usb_dev->devnum)) | |
296 | return -ENOMEM; | |
297 | #endif | |
298 | ||
299 | /* per-device configurations are common */ | |
300 | if (add_hotplug_env_var(envp, num_envp, &i, | |
301 | buffer, buffer_size, &length, | |
302 | "PRODUCT=%x/%x/%x", | |
303 | le16_to_cpu(usb_dev->descriptor.idVendor), | |
304 | le16_to_cpu(usb_dev->descriptor.idProduct), | |
305 | le16_to_cpu(usb_dev->descriptor.bcdDevice))) | |
306 | return -ENOMEM; | |
307 | ||
308 | /* class-based driver binding models */ | |
309 | if (add_hotplug_env_var(envp, num_envp, &i, | |
310 | buffer, buffer_size, &length, | |
311 | "TYPE=%d/%d/%d", | |
312 | usb_dev->descriptor.bDeviceClass, | |
313 | usb_dev->descriptor.bDeviceSubClass, | |
314 | usb_dev->descriptor.bDeviceProtocol)) | |
315 | return -ENOMEM; | |
316 | ||
7521803d GKH |
317 | if (add_hotplug_env_var(envp, num_envp, &i, |
318 | buffer, buffer_size, &length, | |
319 | "INTERFACE=%d/%d/%d", | |
320 | alt->desc.bInterfaceClass, | |
321 | alt->desc.bInterfaceSubClass, | |
322 | alt->desc.bInterfaceProtocol)) | |
323 | return -ENOMEM; | |
1da177e4 | 324 | |
7521803d GKH |
325 | if (add_hotplug_env_var(envp, num_envp, &i, |
326 | buffer, buffer_size, &length, | |
327 | "MODALIAS=usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02Xic%02Xisc%02Xip%02X", | |
328 | le16_to_cpu(usb_dev->descriptor.idVendor), | |
329 | le16_to_cpu(usb_dev->descriptor.idProduct), | |
330 | le16_to_cpu(usb_dev->descriptor.bcdDevice), | |
331 | usb_dev->descriptor.bDeviceClass, | |
332 | usb_dev->descriptor.bDeviceSubClass, | |
333 | usb_dev->descriptor.bDeviceProtocol, | |
334 | alt->desc.bInterfaceClass, | |
335 | alt->desc.bInterfaceSubClass, | |
336 | alt->desc.bInterfaceProtocol)) | |
337 | return -ENOMEM; | |
1da177e4 LT |
338 | |
339 | envp[i] = NULL; | |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
344 | #else | |
345 | ||
346 | static int usb_hotplug (struct device *dev, char **envp, | |
347 | int num_envp, char *buffer, int buffer_size) | |
348 | { | |
349 | return -ENODEV; | |
350 | } | |
351 | ||
352 | #endif /* CONFIG_HOTPLUG */ | |
353 | ||
354 | /** | |
355 | * usb_release_dev - free a usb device structure when all users of it are finished. | |
356 | * @dev: device that's been disconnected | |
357 | * | |
358 | * Will be called only by the device core when all users of this usb device are | |
359 | * done. | |
360 | */ | |
361 | static void usb_release_dev(struct device *dev) | |
362 | { | |
363 | struct usb_device *udev; | |
364 | ||
365 | udev = to_usb_device(dev); | |
366 | ||
367 | usb_destroy_configuration(udev); | |
368 | usb_bus_put(udev->bus); | |
369 | kfree(udev->product); | |
370 | kfree(udev->manufacturer); | |
371 | kfree(udev->serial); | |
372 | kfree(udev); | |
373 | } | |
374 | ||
375 | /** | |
376 | * usb_alloc_dev - usb device constructor (usbcore-internal) | |
377 | * @parent: hub to which device is connected; null to allocate a root hub | |
378 | * @bus: bus used to access the device | |
379 | * @port1: one-based index of port; ignored for root hubs | |
380 | * Context: !in_interrupt () | |
381 | * | |
382 | * Only hub drivers (including virtual root hub drivers for host | |
383 | * controllers) should ever call this. | |
384 | * | |
385 | * This call may not be used in a non-sleeping context. | |
386 | */ | |
387 | struct usb_device * | |
388 | usb_alloc_dev(struct usb_device *parent, struct usb_bus *bus, unsigned port1) | |
389 | { | |
390 | struct usb_device *dev; | |
391 | ||
0a1ef3b5 | 392 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
1da177e4 LT |
393 | if (!dev) |
394 | return NULL; | |
395 | ||
1da177e4 LT |
396 | bus = usb_bus_get(bus); |
397 | if (!bus) { | |
398 | kfree(dev); | |
399 | return NULL; | |
400 | } | |
401 | ||
402 | device_initialize(&dev->dev); | |
403 | dev->dev.bus = &usb_bus_type; | |
404 | dev->dev.dma_mask = bus->controller->dma_mask; | |
405 | dev->dev.driver_data = &usb_generic_driver_data; | |
406 | dev->dev.driver = &usb_generic_driver; | |
407 | dev->dev.release = usb_release_dev; | |
408 | dev->state = USB_STATE_ATTACHED; | |
409 | ||
410 | INIT_LIST_HEAD(&dev->ep0.urb_list); | |
411 | dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE; | |
412 | dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT; | |
413 | /* ep0 maxpacket comes later, from device descriptor */ | |
414 | dev->ep_in[0] = dev->ep_out[0] = &dev->ep0; | |
415 | ||
416 | /* Save readable and stable topology id, distinguishing devices | |
417 | * by location for diagnostics, tools, driver model, etc. The | |
418 | * string is a path along hub ports, from the root. Each device's | |
419 | * dev->devpath will be stable until USB is re-cabled, and hubs | |
420 | * are often labeled with these port numbers. The bus_id isn't | |
421 | * as stable: bus->busnum changes easily from modprobe order, | |
422 | * cardbus or pci hotplugging, and so on. | |
423 | */ | |
424 | if (unlikely (!parent)) { | |
425 | dev->devpath [0] = '0'; | |
426 | ||
427 | dev->dev.parent = bus->controller; | |
428 | sprintf (&dev->dev.bus_id[0], "usb%d", bus->busnum); | |
429 | } else { | |
430 | /* match any labeling on the hubs; it's one-based */ | |
431 | if (parent->devpath [0] == '0') | |
432 | snprintf (dev->devpath, sizeof dev->devpath, | |
433 | "%d", port1); | |
434 | else | |
435 | snprintf (dev->devpath, sizeof dev->devpath, | |
436 | "%s.%d", parent->devpath, port1); | |
437 | ||
438 | dev->dev.parent = &parent->dev; | |
439 | sprintf (&dev->dev.bus_id[0], "%d-%s", | |
440 | bus->busnum, dev->devpath); | |
441 | ||
442 | /* hub driver sets up TT records */ | |
443 | } | |
444 | ||
445 | dev->bus = bus; | |
446 | dev->parent = parent; | |
447 | INIT_LIST_HEAD(&dev->filelist); | |
448 | ||
449 | init_MUTEX(&dev->serialize); | |
450 | ||
451 | return dev; | |
452 | } | |
453 | ||
454 | /** | |
455 | * usb_get_dev - increments the reference count of the usb device structure | |
456 | * @dev: the device being referenced | |
457 | * | |
458 | * Each live reference to a device should be refcounted. | |
459 | * | |
460 | * Drivers for USB interfaces should normally record such references in | |
461 | * their probe() methods, when they bind to an interface, and release | |
462 | * them by calling usb_put_dev(), in their disconnect() methods. | |
463 | * | |
464 | * A pointer to the device with the incremented reference counter is returned. | |
465 | */ | |
466 | struct usb_device *usb_get_dev(struct usb_device *dev) | |
467 | { | |
468 | if (dev) | |
469 | get_device(&dev->dev); | |
470 | return dev; | |
471 | } | |
472 | ||
473 | /** | |
474 | * usb_put_dev - release a use of the usb device structure | |
475 | * @dev: device that's been disconnected | |
476 | * | |
477 | * Must be called when a user of a device is finished with it. When the last | |
478 | * user of the device calls this function, the memory of the device is freed. | |
479 | */ | |
480 | void usb_put_dev(struct usb_device *dev) | |
481 | { | |
482 | if (dev) | |
483 | put_device(&dev->dev); | |
484 | } | |
485 | ||
486 | /** | |
487 | * usb_get_intf - increments the reference count of the usb interface structure | |
488 | * @intf: the interface being referenced | |
489 | * | |
490 | * Each live reference to a interface must be refcounted. | |
491 | * | |
492 | * Drivers for USB interfaces should normally record such references in | |
493 | * their probe() methods, when they bind to an interface, and release | |
494 | * them by calling usb_put_intf(), in their disconnect() methods. | |
495 | * | |
496 | * A pointer to the interface with the incremented reference counter is | |
497 | * returned. | |
498 | */ | |
499 | struct usb_interface *usb_get_intf(struct usb_interface *intf) | |
500 | { | |
501 | if (intf) | |
502 | get_device(&intf->dev); | |
503 | return intf; | |
504 | } | |
505 | ||
506 | /** | |
507 | * usb_put_intf - release a use of the usb interface structure | |
508 | * @intf: interface that's been decremented | |
509 | * | |
510 | * Must be called when a user of an interface is finished with it. When the | |
511 | * last user of the interface calls this function, the memory of the interface | |
512 | * is freed. | |
513 | */ | |
514 | void usb_put_intf(struct usb_interface *intf) | |
515 | { | |
516 | if (intf) | |
517 | put_device(&intf->dev); | |
518 | } | |
519 | ||
520 | ||
521 | /* USB device locking | |
522 | * | |
523 | * Although locking USB devices should be straightforward, it is | |
524 | * complicated by the way the driver-model core works. When a new USB | |
525 | * driver is registered or unregistered, the core will automatically | |
526 | * probe or disconnect all matching interfaces on all USB devices while | |
527 | * holding the USB subsystem writelock. There's no good way for us to | |
528 | * tell which devices will be used or to lock them beforehand; our only | |
529 | * option is to effectively lock all the USB devices. | |
530 | * | |
531 | * We do that by using a private rw-semaphore, usb_all_devices_rwsem. | |
532 | * When locking an individual device you must first acquire the rwsem's | |
533 | * readlock. When a driver is registered or unregistered the writelock | |
534 | * must be held. These actions are encapsulated in the subroutines | |
535 | * below, so all a driver needs to do is call usb_lock_device() and | |
536 | * usb_unlock_device(). | |
537 | * | |
538 | * Complications arise when several devices are to be locked at the same | |
539 | * time. Only hub-aware drivers that are part of usbcore ever have to | |
540 | * do this; nobody else needs to worry about it. The problem is that | |
541 | * usb_lock_device() must not be called to lock a second device since it | |
542 | * would acquire the rwsem's readlock reentrantly, leading to deadlock if | |
543 | * another thread was waiting for the writelock. The solution is simple: | |
544 | * | |
545 | * When locking more than one device, call usb_lock_device() | |
546 | * to lock the first one. Lock the others by calling | |
547 | * down(&udev->serialize) directly. | |
548 | * | |
549 | * When unlocking multiple devices, use up(&udev->serialize) | |
550 | * to unlock all but the last one. Unlock the last one by | |
551 | * calling usb_unlock_device(). | |
552 | * | |
553 | * When locking both a device and its parent, always lock the | |
554 | * the parent first. | |
555 | */ | |
556 | ||
557 | /** | |
558 | * usb_lock_device - acquire the lock for a usb device structure | |
559 | * @udev: device that's being locked | |
560 | * | |
561 | * Use this routine when you don't hold any other device locks; | |
562 | * to acquire nested inner locks call down(&udev->serialize) directly. | |
563 | * This is necessary for proper interaction with usb_lock_all_devices(). | |
564 | */ | |
565 | void usb_lock_device(struct usb_device *udev) | |
566 | { | |
567 | down_read(&usb_all_devices_rwsem); | |
568 | down(&udev->serialize); | |
569 | } | |
570 | ||
571 | /** | |
572 | * usb_trylock_device - attempt to acquire the lock for a usb device structure | |
573 | * @udev: device that's being locked | |
574 | * | |
575 | * Don't use this routine if you already hold a device lock; | |
576 | * use down_trylock(&udev->serialize) instead. | |
577 | * This is necessary for proper interaction with usb_lock_all_devices(). | |
578 | * | |
579 | * Returns 1 if successful, 0 if contention. | |
580 | */ | |
581 | int usb_trylock_device(struct usb_device *udev) | |
582 | { | |
583 | if (!down_read_trylock(&usb_all_devices_rwsem)) | |
584 | return 0; | |
585 | if (down_trylock(&udev->serialize)) { | |
586 | up_read(&usb_all_devices_rwsem); | |
587 | return 0; | |
588 | } | |
589 | return 1; | |
590 | } | |
591 | ||
592 | /** | |
593 | * usb_lock_device_for_reset - cautiously acquire the lock for a | |
594 | * usb device structure | |
595 | * @udev: device that's being locked | |
596 | * @iface: interface bound to the driver making the request (optional) | |
597 | * | |
598 | * Attempts to acquire the device lock, but fails if the device is | |
599 | * NOTATTACHED or SUSPENDED, or if iface is specified and the interface | |
600 | * is neither BINDING nor BOUND. Rather than sleeping to wait for the | |
601 | * lock, the routine polls repeatedly. This is to prevent deadlock with | |
602 | * disconnect; in some drivers (such as usb-storage) the disconnect() | |
3ea15966 | 603 | * or suspend() method will block waiting for a device reset to complete. |
1da177e4 LT |
604 | * |
605 | * Returns a negative error code for failure, otherwise 1 or 0 to indicate | |
606 | * that the device will or will not have to be unlocked. (0 can be | |
607 | * returned when an interface is given and is BINDING, because in that | |
608 | * case the driver already owns the device lock.) | |
609 | */ | |
610 | int usb_lock_device_for_reset(struct usb_device *udev, | |
611 | struct usb_interface *iface) | |
612 | { | |
3ea15966 AS |
613 | unsigned long jiffies_expire = jiffies + HZ; |
614 | ||
1da177e4 LT |
615 | if (udev->state == USB_STATE_NOTATTACHED) |
616 | return -ENODEV; | |
617 | if (udev->state == USB_STATE_SUSPENDED) | |
618 | return -EHOSTUNREACH; | |
619 | if (iface) { | |
620 | switch (iface->condition) { | |
621 | case USB_INTERFACE_BINDING: | |
622 | return 0; | |
623 | case USB_INTERFACE_BOUND: | |
624 | break; | |
625 | default: | |
626 | return -EINTR; | |
627 | } | |
628 | } | |
629 | ||
630 | while (!usb_trylock_device(udev)) { | |
3ea15966 AS |
631 | |
632 | /* If we can't acquire the lock after waiting one second, | |
633 | * we're probably deadlocked */ | |
634 | if (time_after(jiffies, jiffies_expire)) | |
635 | return -EBUSY; | |
636 | ||
1da177e4 LT |
637 | msleep(15); |
638 | if (udev->state == USB_STATE_NOTATTACHED) | |
639 | return -ENODEV; | |
640 | if (udev->state == USB_STATE_SUSPENDED) | |
641 | return -EHOSTUNREACH; | |
642 | if (iface && iface->condition != USB_INTERFACE_BOUND) | |
643 | return -EINTR; | |
644 | } | |
645 | return 1; | |
646 | } | |
647 | ||
648 | /** | |
649 | * usb_unlock_device - release the lock for a usb device structure | |
650 | * @udev: device that's being unlocked | |
651 | * | |
652 | * Use this routine when releasing the only device lock you hold; | |
653 | * to release inner nested locks call up(&udev->serialize) directly. | |
654 | * This is necessary for proper interaction with usb_lock_all_devices(). | |
655 | */ | |
656 | void usb_unlock_device(struct usb_device *udev) | |
657 | { | |
658 | up(&udev->serialize); | |
659 | up_read(&usb_all_devices_rwsem); | |
660 | } | |
661 | ||
662 | /** | |
663 | * usb_lock_all_devices - acquire the lock for all usb device structures | |
664 | * | |
665 | * This is necessary when registering a new driver or probing a bus, | |
666 | * since the driver-model core may try to use any usb_device. | |
667 | */ | |
668 | void usb_lock_all_devices(void) | |
669 | { | |
670 | down_write(&usb_all_devices_rwsem); | |
671 | } | |
672 | ||
673 | /** | |
674 | * usb_unlock_all_devices - release the lock for all usb device structures | |
675 | */ | |
676 | void usb_unlock_all_devices(void) | |
677 | { | |
678 | up_write(&usb_all_devices_rwsem); | |
679 | } | |
680 | ||
681 | ||
682 | static struct usb_device *match_device(struct usb_device *dev, | |
683 | u16 vendor_id, u16 product_id) | |
684 | { | |
685 | struct usb_device *ret_dev = NULL; | |
686 | int child; | |
687 | ||
688 | dev_dbg(&dev->dev, "check for vendor %04x, product %04x ...\n", | |
689 | le16_to_cpu(dev->descriptor.idVendor), | |
690 | le16_to_cpu(dev->descriptor.idProduct)); | |
691 | ||
692 | /* see if this device matches */ | |
693 | if ((vendor_id == le16_to_cpu(dev->descriptor.idVendor)) && | |
694 | (product_id == le16_to_cpu(dev->descriptor.idProduct))) { | |
695 | dev_dbg (&dev->dev, "matched this device!\n"); | |
696 | ret_dev = usb_get_dev(dev); | |
697 | goto exit; | |
698 | } | |
699 | ||
700 | /* look through all of the children of this device */ | |
701 | for (child = 0; child < dev->maxchild; ++child) { | |
702 | if (dev->children[child]) { | |
703 | down(&dev->children[child]->serialize); | |
704 | ret_dev = match_device(dev->children[child], | |
705 | vendor_id, product_id); | |
706 | up(&dev->children[child]->serialize); | |
707 | if (ret_dev) | |
708 | goto exit; | |
709 | } | |
710 | } | |
711 | exit: | |
712 | return ret_dev; | |
713 | } | |
714 | ||
715 | /** | |
716 | * usb_find_device - find a specific usb device in the system | |
717 | * @vendor_id: the vendor id of the device to find | |
718 | * @product_id: the product id of the device to find | |
719 | * | |
720 | * Returns a pointer to a struct usb_device if such a specified usb | |
721 | * device is present in the system currently. The usage count of the | |
722 | * device will be incremented if a device is found. Make sure to call | |
723 | * usb_put_dev() when the caller is finished with the device. | |
724 | * | |
725 | * If a device with the specified vendor and product id is not found, | |
726 | * NULL is returned. | |
727 | */ | |
728 | struct usb_device *usb_find_device(u16 vendor_id, u16 product_id) | |
729 | { | |
730 | struct list_head *buslist; | |
731 | struct usb_bus *bus; | |
732 | struct usb_device *dev = NULL; | |
733 | ||
734 | down(&usb_bus_list_lock); | |
735 | for (buslist = usb_bus_list.next; | |
736 | buslist != &usb_bus_list; | |
737 | buslist = buslist->next) { | |
738 | bus = container_of(buslist, struct usb_bus, bus_list); | |
739 | if (!bus->root_hub) | |
740 | continue; | |
741 | usb_lock_device(bus->root_hub); | |
742 | dev = match_device(bus->root_hub, vendor_id, product_id); | |
743 | usb_unlock_device(bus->root_hub); | |
744 | if (dev) | |
745 | goto exit; | |
746 | } | |
747 | exit: | |
748 | up(&usb_bus_list_lock); | |
749 | return dev; | |
750 | } | |
751 | ||
752 | /** | |
753 | * usb_get_current_frame_number - return current bus frame number | |
754 | * @dev: the device whose bus is being queried | |
755 | * | |
756 | * Returns the current frame number for the USB host controller | |
757 | * used with the given USB device. This can be used when scheduling | |
758 | * isochronous requests. | |
759 | * | |
760 | * Note that different kinds of host controller have different | |
761 | * "scheduling horizons". While one type might support scheduling only | |
762 | * 32 frames into the future, others could support scheduling up to | |
763 | * 1024 frames into the future. | |
764 | */ | |
765 | int usb_get_current_frame_number(struct usb_device *dev) | |
766 | { | |
767 | return dev->bus->op->get_frame_number (dev); | |
768 | } | |
769 | ||
770 | /*-------------------------------------------------------------------*/ | |
771 | /* | |
772 | * __usb_get_extra_descriptor() finds a descriptor of specific type in the | |
773 | * extra field of the interface and endpoint descriptor structs. | |
774 | */ | |
775 | ||
776 | int __usb_get_extra_descriptor(char *buffer, unsigned size, | |
777 | unsigned char type, void **ptr) | |
778 | { | |
779 | struct usb_descriptor_header *header; | |
780 | ||
781 | while (size >= sizeof(struct usb_descriptor_header)) { | |
782 | header = (struct usb_descriptor_header *)buffer; | |
783 | ||
784 | if (header->bLength < 2) { | |
785 | printk(KERN_ERR | |
786 | "%s: bogus descriptor, type %d length %d\n", | |
787 | usbcore_name, | |
788 | header->bDescriptorType, | |
789 | header->bLength); | |
790 | return -1; | |
791 | } | |
792 | ||
793 | if (header->bDescriptorType == type) { | |
794 | *ptr = header; | |
795 | return 0; | |
796 | } | |
797 | ||
798 | buffer += header->bLength; | |
799 | size -= header->bLength; | |
800 | } | |
801 | return -1; | |
802 | } | |
803 | ||
804 | /** | |
805 | * usb_buffer_alloc - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP | |
806 | * @dev: device the buffer will be used with | |
807 | * @size: requested buffer size | |
808 | * @mem_flags: affect whether allocation may block | |
809 | * @dma: used to return DMA address of buffer | |
810 | * | |
811 | * Return value is either null (indicating no buffer could be allocated), or | |
812 | * the cpu-space pointer to a buffer that may be used to perform DMA to the | |
813 | * specified device. Such cpu-space buffers are returned along with the DMA | |
814 | * address (through the pointer provided). | |
815 | * | |
816 | * These buffers are used with URB_NO_xxx_DMA_MAP set in urb->transfer_flags | |
817 | * to avoid behaviors like using "DMA bounce buffers", or tying down I/O | |
818 | * mapping hardware for long idle periods. The implementation varies between | |
819 | * platforms, depending on details of how DMA will work to this device. | |
820 | * Using these buffers also helps prevent cacheline sharing problems on | |
821 | * architectures where CPU caches are not DMA-coherent. | |
822 | * | |
823 | * When the buffer is no longer used, free it with usb_buffer_free(). | |
824 | */ | |
825 | void *usb_buffer_alloc ( | |
826 | struct usb_device *dev, | |
827 | size_t size, | |
55016f10 | 828 | gfp_t mem_flags, |
1da177e4 LT |
829 | dma_addr_t *dma |
830 | ) | |
831 | { | |
832 | if (!dev || !dev->bus || !dev->bus->op || !dev->bus->op->buffer_alloc) | |
833 | return NULL; | |
834 | return dev->bus->op->buffer_alloc (dev->bus, size, mem_flags, dma); | |
835 | } | |
836 | ||
837 | /** | |
838 | * usb_buffer_free - free memory allocated with usb_buffer_alloc() | |
839 | * @dev: device the buffer was used with | |
840 | * @size: requested buffer size | |
841 | * @addr: CPU address of buffer | |
842 | * @dma: DMA address of buffer | |
843 | * | |
844 | * This reclaims an I/O buffer, letting it be reused. The memory must have | |
845 | * been allocated using usb_buffer_alloc(), and the parameters must match | |
846 | * those provided in that allocation request. | |
847 | */ | |
848 | void usb_buffer_free ( | |
849 | struct usb_device *dev, | |
850 | size_t size, | |
851 | void *addr, | |
852 | dma_addr_t dma | |
853 | ) | |
854 | { | |
855 | if (!dev || !dev->bus || !dev->bus->op || !dev->bus->op->buffer_free) | |
856 | return; | |
857 | dev->bus->op->buffer_free (dev->bus, size, addr, dma); | |
858 | } | |
859 | ||
860 | /** | |
861 | * usb_buffer_map - create DMA mapping(s) for an urb | |
862 | * @urb: urb whose transfer_buffer/setup_packet will be mapped | |
863 | * | |
864 | * Return value is either null (indicating no buffer could be mapped), or | |
865 | * the parameter. URB_NO_TRANSFER_DMA_MAP and URB_NO_SETUP_DMA_MAP are | |
866 | * added to urb->transfer_flags if the operation succeeds. If the device | |
867 | * is connected to this system through a non-DMA controller, this operation | |
868 | * always succeeds. | |
869 | * | |
870 | * This call would normally be used for an urb which is reused, perhaps | |
871 | * as the target of a large periodic transfer, with usb_buffer_dmasync() | |
872 | * calls to synchronize memory and dma state. | |
873 | * | |
874 | * Reverse the effect of this call with usb_buffer_unmap(). | |
875 | */ | |
876 | #if 0 | |
877 | struct urb *usb_buffer_map (struct urb *urb) | |
878 | { | |
879 | struct usb_bus *bus; | |
880 | struct device *controller; | |
881 | ||
882 | if (!urb | |
883 | || !urb->dev | |
884 | || !(bus = urb->dev->bus) | |
885 | || !(controller = bus->controller)) | |
886 | return NULL; | |
887 | ||
888 | if (controller->dma_mask) { | |
889 | urb->transfer_dma = dma_map_single (controller, | |
890 | urb->transfer_buffer, urb->transfer_buffer_length, | |
891 | usb_pipein (urb->pipe) | |
892 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); | |
893 | if (usb_pipecontrol (urb->pipe)) | |
894 | urb->setup_dma = dma_map_single (controller, | |
895 | urb->setup_packet, | |
896 | sizeof (struct usb_ctrlrequest), | |
897 | DMA_TO_DEVICE); | |
898 | // FIXME generic api broken like pci, can't report errors | |
899 | // if (urb->transfer_dma == DMA_ADDR_INVALID) return 0; | |
900 | } else | |
901 | urb->transfer_dma = ~0; | |
902 | urb->transfer_flags |= (URB_NO_TRANSFER_DMA_MAP | |
903 | | URB_NO_SETUP_DMA_MAP); | |
904 | return urb; | |
905 | } | |
906 | #endif /* 0 */ | |
907 | ||
908 | /* XXX DISABLED, no users currently. If you wish to re-enable this | |
909 | * XXX please determine whether the sync is to transfer ownership of | |
910 | * XXX the buffer from device to cpu or vice verse, and thusly use the | |
911 | * XXX appropriate _for_{cpu,device}() method. -DaveM | |
912 | */ | |
913 | #if 0 | |
914 | ||
915 | /** | |
916 | * usb_buffer_dmasync - synchronize DMA and CPU view of buffer(s) | |
917 | * @urb: urb whose transfer_buffer/setup_packet will be synchronized | |
918 | */ | |
919 | void usb_buffer_dmasync (struct urb *urb) | |
920 | { | |
921 | struct usb_bus *bus; | |
922 | struct device *controller; | |
923 | ||
924 | if (!urb | |
925 | || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) | |
926 | || !urb->dev | |
927 | || !(bus = urb->dev->bus) | |
928 | || !(controller = bus->controller)) | |
929 | return; | |
930 | ||
931 | if (controller->dma_mask) { | |
932 | dma_sync_single (controller, | |
933 | urb->transfer_dma, urb->transfer_buffer_length, | |
934 | usb_pipein (urb->pipe) | |
935 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); | |
936 | if (usb_pipecontrol (urb->pipe)) | |
937 | dma_sync_single (controller, | |
938 | urb->setup_dma, | |
939 | sizeof (struct usb_ctrlrequest), | |
940 | DMA_TO_DEVICE); | |
941 | } | |
942 | } | |
943 | #endif | |
944 | ||
945 | /** | |
946 | * usb_buffer_unmap - free DMA mapping(s) for an urb | |
947 | * @urb: urb whose transfer_buffer will be unmapped | |
948 | * | |
949 | * Reverses the effect of usb_buffer_map(). | |
950 | */ | |
951 | #if 0 | |
952 | void usb_buffer_unmap (struct urb *urb) | |
953 | { | |
954 | struct usb_bus *bus; | |
955 | struct device *controller; | |
956 | ||
957 | if (!urb | |
958 | || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) | |
959 | || !urb->dev | |
960 | || !(bus = urb->dev->bus) | |
961 | || !(controller = bus->controller)) | |
962 | return; | |
963 | ||
964 | if (controller->dma_mask) { | |
965 | dma_unmap_single (controller, | |
966 | urb->transfer_dma, urb->transfer_buffer_length, | |
967 | usb_pipein (urb->pipe) | |
968 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); | |
969 | if (usb_pipecontrol (urb->pipe)) | |
970 | dma_unmap_single (controller, | |
971 | urb->setup_dma, | |
972 | sizeof (struct usb_ctrlrequest), | |
973 | DMA_TO_DEVICE); | |
974 | } | |
975 | urb->transfer_flags &= ~(URB_NO_TRANSFER_DMA_MAP | |
976 | | URB_NO_SETUP_DMA_MAP); | |
977 | } | |
978 | #endif /* 0 */ | |
979 | ||
980 | /** | |
981 | * usb_buffer_map_sg - create scatterlist DMA mapping(s) for an endpoint | |
982 | * @dev: device to which the scatterlist will be mapped | |
983 | * @pipe: endpoint defining the mapping direction | |
984 | * @sg: the scatterlist to map | |
985 | * @nents: the number of entries in the scatterlist | |
986 | * | |
987 | * Return value is either < 0 (indicating no buffers could be mapped), or | |
988 | * the number of DMA mapping array entries in the scatterlist. | |
989 | * | |
990 | * The caller is responsible for placing the resulting DMA addresses from | |
991 | * the scatterlist into URB transfer buffer pointers, and for setting the | |
992 | * URB_NO_TRANSFER_DMA_MAP transfer flag in each of those URBs. | |
993 | * | |
994 | * Top I/O rates come from queuing URBs, instead of waiting for each one | |
995 | * to complete before starting the next I/O. This is particularly easy | |
996 | * to do with scatterlists. Just allocate and submit one URB for each DMA | |
997 | * mapping entry returned, stopping on the first error or when all succeed. | |
998 | * Better yet, use the usb_sg_*() calls, which do that (and more) for you. | |
999 | * | |
1000 | * This call would normally be used when translating scatterlist requests, | |
1001 | * rather than usb_buffer_map(), since on some hardware (with IOMMUs) it | |
1002 | * may be able to coalesce mappings for improved I/O efficiency. | |
1003 | * | |
1004 | * Reverse the effect of this call with usb_buffer_unmap_sg(). | |
1005 | */ | |
1006 | int usb_buffer_map_sg (struct usb_device *dev, unsigned pipe, | |
1007 | struct scatterlist *sg, int nents) | |
1008 | { | |
1009 | struct usb_bus *bus; | |
1010 | struct device *controller; | |
1011 | ||
1012 | if (!dev | |
1013 | || usb_pipecontrol (pipe) | |
1014 | || !(bus = dev->bus) | |
1015 | || !(controller = bus->controller) | |
1016 | || !controller->dma_mask) | |
1017 | return -1; | |
1018 | ||
1019 | // FIXME generic api broken like pci, can't report errors | |
1020 | return dma_map_sg (controller, sg, nents, | |
1021 | usb_pipein (pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE); | |
1022 | } | |
1023 | ||
1024 | /* XXX DISABLED, no users currently. If you wish to re-enable this | |
1025 | * XXX please determine whether the sync is to transfer ownership of | |
1026 | * XXX the buffer from device to cpu or vice verse, and thusly use the | |
1027 | * XXX appropriate _for_{cpu,device}() method. -DaveM | |
1028 | */ | |
1029 | #if 0 | |
1030 | ||
1031 | /** | |
1032 | * usb_buffer_dmasync_sg - synchronize DMA and CPU view of scatterlist buffer(s) | |
1033 | * @dev: device to which the scatterlist will be mapped | |
1034 | * @pipe: endpoint defining the mapping direction | |
1035 | * @sg: the scatterlist to synchronize | |
1036 | * @n_hw_ents: the positive return value from usb_buffer_map_sg | |
1037 | * | |
1038 | * Use this when you are re-using a scatterlist's data buffers for | |
1039 | * another USB request. | |
1040 | */ | |
1041 | void usb_buffer_dmasync_sg (struct usb_device *dev, unsigned pipe, | |
1042 | struct scatterlist *sg, int n_hw_ents) | |
1043 | { | |
1044 | struct usb_bus *bus; | |
1045 | struct device *controller; | |
1046 | ||
1047 | if (!dev | |
1048 | || !(bus = dev->bus) | |
1049 | || !(controller = bus->controller) | |
1050 | || !controller->dma_mask) | |
1051 | return; | |
1052 | ||
1053 | dma_sync_sg (controller, sg, n_hw_ents, | |
1054 | usb_pipein (pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE); | |
1055 | } | |
1056 | #endif | |
1057 | ||
1058 | /** | |
1059 | * usb_buffer_unmap_sg - free DMA mapping(s) for a scatterlist | |
1060 | * @dev: device to which the scatterlist will be mapped | |
1061 | * @pipe: endpoint defining the mapping direction | |
1062 | * @sg: the scatterlist to unmap | |
1063 | * @n_hw_ents: the positive return value from usb_buffer_map_sg | |
1064 | * | |
1065 | * Reverses the effect of usb_buffer_map_sg(). | |
1066 | */ | |
1067 | void usb_buffer_unmap_sg (struct usb_device *dev, unsigned pipe, | |
1068 | struct scatterlist *sg, int n_hw_ents) | |
1069 | { | |
1070 | struct usb_bus *bus; | |
1071 | struct device *controller; | |
1072 | ||
1073 | if (!dev | |
1074 | || !(bus = dev->bus) | |
1075 | || !(controller = bus->controller) | |
1076 | || !controller->dma_mask) | |
1077 | return; | |
1078 | ||
1079 | dma_unmap_sg (controller, sg, n_hw_ents, | |
1080 | usb_pipein (pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE); | |
1081 | } | |
1082 | ||
390a8c34 DB |
1083 | static int verify_suspended(struct device *dev, void *unused) |
1084 | { | |
1085 | return (dev->power.power_state.event == PM_EVENT_ON) ? -EBUSY : 0; | |
1086 | } | |
1087 | ||
27d72e85 | 1088 | static int usb_generic_suspend(struct device *dev, pm_message_t message) |
1da177e4 | 1089 | { |
db690874 DB |
1090 | struct usb_interface *intf; |
1091 | struct usb_driver *driver; | |
1092 | int status; | |
1da177e4 | 1093 | |
390a8c34 DB |
1094 | /* USB devices enter SUSPEND state through their hubs, but can be |
1095 | * marked for FREEZE as soon as their children are already idled. | |
979d5199 | 1096 | * But those semantics are useless, so we equate the two (sigh). |
390a8c34 DB |
1097 | */ |
1098 | if (dev->driver == &usb_generic_driver) { | |
1099 | if (dev->power.power_state.event == message.event) | |
1100 | return 0; | |
1101 | /* we need to rule out bogus requests through sysfs */ | |
1102 | status = device_for_each_child(dev, NULL, verify_suspended); | |
1103 | if (status) | |
1104 | return status; | |
390a8c34 DB |
1105 | return usb_suspend_device (to_usb_device(dev)); |
1106 | } | |
1da177e4 LT |
1107 | |
1108 | if ((dev->driver == NULL) || | |
1109 | (dev->driver_data == &usb_generic_driver_data)) | |
1110 | return 0; | |
1111 | ||
1112 | intf = to_usb_interface(dev); | |
1113 | driver = to_usb_driver(dev->driver); | |
1114 | ||
db690874 DB |
1115 | /* with no hardware, USB interfaces only use FREEZE and ON states */ |
1116 | if (!is_active(intf)) | |
1da177e4 LT |
1117 | return 0; |
1118 | ||
db690874 DB |
1119 | if (driver->suspend && driver->resume) { |
1120 | status = driver->suspend(intf, message); | |
1121 | if (status) | |
1122 | dev_err(dev, "%s error %d\n", "suspend", status); | |
1123 | else | |
1124 | mark_quiesced(intf); | |
1125 | } else { | |
1126 | // FIXME else if there's no suspend method, disconnect... | |
5a9191ff AS |
1127 | dev_warn(dev, "no suspend for driver %s?\n", driver->name); |
1128 | mark_quiesced(intf); | |
db690874 DB |
1129 | status = 0; |
1130 | } | |
1131 | return status; | |
1da177e4 LT |
1132 | } |
1133 | ||
1134 | static int usb_generic_resume(struct device *dev) | |
1135 | { | |
db690874 DB |
1136 | struct usb_interface *intf; |
1137 | struct usb_driver *driver; | |
979d5199 | 1138 | struct usb_device *udev; |
db690874 DB |
1139 | int status; |
1140 | ||
1141 | if (dev->power.power_state.event == PM_EVENT_ON) | |
1142 | return 0; | |
1da177e4 | 1143 | |
979d5199 DB |
1144 | /* mark things as "on" immediately, no matter what errors crop up */ |
1145 | dev->power.power_state.event = PM_EVENT_ON; | |
1146 | ||
db690874 | 1147 | /* devices resume through their hubs */ |
979d5199 DB |
1148 | if (dev->driver == &usb_generic_driver) { |
1149 | udev = to_usb_device(dev); | |
1150 | if (udev->state == USB_STATE_NOTATTACHED) | |
1151 | return 0; | |
1da177e4 | 1152 | return usb_resume_device (to_usb_device(dev)); |
979d5199 | 1153 | } |
1da177e4 LT |
1154 | |
1155 | if ((dev->driver == NULL) || | |
5a9191ff AS |
1156 | (dev->driver_data == &usb_generic_driver_data)) { |
1157 | dev->power.power_state.event = PM_EVENT_FREEZE; | |
1da177e4 | 1158 | return 0; |
5a9191ff | 1159 | } |
1da177e4 LT |
1160 | |
1161 | intf = to_usb_interface(dev); | |
1162 | driver = to_usb_driver(dev->driver); | |
1163 | ||
979d5199 DB |
1164 | udev = interface_to_usbdev(intf); |
1165 | if (udev->state == USB_STATE_NOTATTACHED) | |
1166 | return 0; | |
1167 | ||
db690874 DB |
1168 | /* if driver was suspended, it has a resume method; |
1169 | * however, sysfs can wrongly mark things as suspended | |
1170 | * (on the "no suspend method" FIXME path above) | |
1171 | */ | |
db690874 DB |
1172 | if (driver->resume) { |
1173 | status = driver->resume(intf); | |
1174 | if (status) { | |
1175 | dev_err(dev, "%s error %d\n", "resume", status); | |
1176 | mark_quiesced(intf); | |
1177 | } | |
1178 | } else | |
5a9191ff | 1179 | dev_warn(dev, "no resume for driver %s?\n", driver->name); |
1da177e4 LT |
1180 | return 0; |
1181 | } | |
1182 | ||
1183 | struct bus_type usb_bus_type = { | |
1184 | .name = "usb", | |
1185 | .match = usb_device_match, | |
1186 | .hotplug = usb_hotplug, | |
1187 | .suspend = usb_generic_suspend, | |
1188 | .resume = usb_generic_resume, | |
1189 | }; | |
1190 | ||
1191 | #ifndef MODULE | |
1192 | ||
1193 | static int __init usb_setup_disable(char *str) | |
1194 | { | |
1195 | nousb = 1; | |
1196 | return 1; | |
1197 | } | |
1198 | ||
1199 | /* format to disable USB on kernel command line is: nousb */ | |
1200 | __setup("nousb", usb_setup_disable); | |
1201 | ||
1202 | #endif | |
1203 | ||
1204 | /* | |
1205 | * for external read access to <nousb> | |
1206 | */ | |
1207 | int usb_disabled(void) | |
1208 | { | |
1209 | return nousb; | |
1210 | } | |
1211 | ||
1212 | /* | |
1213 | * Init | |
1214 | */ | |
1215 | static int __init usb_init(void) | |
1216 | { | |
1217 | int retval; | |
1218 | if (nousb) { | |
1219 | pr_info ("%s: USB support disabled\n", usbcore_name); | |
1220 | return 0; | |
1221 | } | |
1222 | ||
1223 | retval = bus_register(&usb_bus_type); | |
1224 | if (retval) | |
1225 | goto out; | |
1226 | retval = usb_host_init(); | |
1227 | if (retval) | |
1228 | goto host_init_failed; | |
1229 | retval = usb_major_init(); | |
1230 | if (retval) | |
1231 | goto major_init_failed; | |
fbf82fd2 KS |
1232 | retval = usb_register(&usbfs_driver); |
1233 | if (retval) | |
1234 | goto driver_register_failed; | |
1235 | retval = usbdev_init(); | |
1236 | if (retval) | |
1237 | goto usbdevice_init_failed; | |
1da177e4 LT |
1238 | retval = usbfs_init(); |
1239 | if (retval) | |
1240 | goto fs_init_failed; | |
1241 | retval = usb_hub_init(); | |
1242 | if (retval) | |
1243 | goto hub_init_failed; | |
1da177e4 LT |
1244 | retval = driver_register(&usb_generic_driver); |
1245 | if (!retval) | |
1246 | goto out; | |
1247 | ||
1248 | usb_hub_cleanup(); | |
1249 | hub_init_failed: | |
1250 | usbfs_cleanup(); | |
1251 | fs_init_failed: | |
fbf82fd2 KS |
1252 | usbdev_cleanup(); |
1253 | usbdevice_init_failed: | |
1254 | usb_deregister(&usbfs_driver); | |
1255 | driver_register_failed: | |
1256 | usb_major_cleanup(); | |
1da177e4 LT |
1257 | major_init_failed: |
1258 | usb_host_cleanup(); | |
1259 | host_init_failed: | |
1260 | bus_unregister(&usb_bus_type); | |
1261 | out: | |
1262 | return retval; | |
1263 | } | |
1264 | ||
1265 | /* | |
1266 | * Cleanup | |
1267 | */ | |
1268 | static void __exit usb_exit(void) | |
1269 | { | |
1270 | /* This will matter if shutdown/reboot does exitcalls. */ | |
1271 | if (nousb) | |
1272 | return; | |
1273 | ||
1274 | driver_unregister(&usb_generic_driver); | |
1275 | usb_major_cleanup(); | |
1276 | usbfs_cleanup(); | |
fbf82fd2 KS |
1277 | usb_deregister(&usbfs_driver); |
1278 | usbdev_cleanup(); | |
1da177e4 LT |
1279 | usb_hub_cleanup(); |
1280 | usb_host_cleanup(); | |
1281 | bus_unregister(&usb_bus_type); | |
1282 | } | |
1283 | ||
1284 | subsys_initcall(usb_init); | |
1285 | module_exit(usb_exit); | |
1286 | ||
1287 | /* | |
1288 | * USB may be built into the kernel or be built as modules. | |
1289 | * These symbols are exported for device (or host controller) | |
1290 | * driver modules to use. | |
1291 | */ | |
1292 | ||
1da177e4 LT |
1293 | EXPORT_SYMBOL(usb_disabled); |
1294 | ||
a3fdf4eb | 1295 | EXPORT_SYMBOL_GPL(usb_get_intf); |
1296 | EXPORT_SYMBOL_GPL(usb_put_intf); | |
1297 | ||
1da177e4 LT |
1298 | EXPORT_SYMBOL(usb_alloc_dev); |
1299 | EXPORT_SYMBOL(usb_put_dev); | |
1300 | EXPORT_SYMBOL(usb_get_dev); | |
1301 | EXPORT_SYMBOL(usb_hub_tt_clear_buffer); | |
1302 | ||
1303 | EXPORT_SYMBOL(usb_lock_device); | |
1304 | EXPORT_SYMBOL(usb_trylock_device); | |
1305 | EXPORT_SYMBOL(usb_lock_device_for_reset); | |
1306 | EXPORT_SYMBOL(usb_unlock_device); | |
1307 | ||
1308 | EXPORT_SYMBOL(usb_driver_claim_interface); | |
1309 | EXPORT_SYMBOL(usb_driver_release_interface); | |
1da177e4 LT |
1310 | EXPORT_SYMBOL(usb_find_interface); |
1311 | EXPORT_SYMBOL(usb_ifnum_to_if); | |
1312 | EXPORT_SYMBOL(usb_altnum_to_altsetting); | |
1313 | ||
1314 | EXPORT_SYMBOL(usb_reset_device); | |
1315 | EXPORT_SYMBOL(usb_disconnect); | |
1316 | ||
1317 | EXPORT_SYMBOL(__usb_get_extra_descriptor); | |
1318 | ||
1319 | EXPORT_SYMBOL(usb_find_device); | |
1320 | EXPORT_SYMBOL(usb_get_current_frame_number); | |
1321 | ||
1322 | EXPORT_SYMBOL (usb_buffer_alloc); | |
1323 | EXPORT_SYMBOL (usb_buffer_free); | |
1324 | ||
1325 | #if 0 | |
1326 | EXPORT_SYMBOL (usb_buffer_map); | |
1327 | EXPORT_SYMBOL (usb_buffer_dmasync); | |
1328 | EXPORT_SYMBOL (usb_buffer_unmap); | |
1329 | #endif | |
1330 | ||
1331 | EXPORT_SYMBOL (usb_buffer_map_sg); | |
1332 | #if 0 | |
1333 | EXPORT_SYMBOL (usb_buffer_dmasync_sg); | |
1334 | #endif | |
1335 | EXPORT_SYMBOL (usb_buffer_unmap_sg); | |
1336 | ||
1337 | MODULE_LICENSE("GPL"); |