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Commit | Line | Data |
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1da177e4 | 1 | /* |
f30c2269 | 2 | * drivers/usb/core/usb.c |
1da177e4 LT |
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 | ||
1da177e4 | 24 | #include <linux/module.h> |
b5e795f8 | 25 | #include <linux/moduleparam.h> |
1da177e4 LT |
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> | |
1da177e4 | 34 | #include <linux/usb.h> |
4186ecf8 | 35 | #include <linux/mutex.h> |
bd859281 | 36 | #include <linux/workqueue.h> |
1da177e4 LT |
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 */ | |
1da177e4 | 50 | |
6b157c9b AS |
51 | /* Workqueue for autosuspend and for remote wakeup of root hubs */ |
52 | struct workqueue_struct *ksuspend_usb_wq; | |
bd859281 | 53 | |
b5e795f8 AS |
54 | #ifdef CONFIG_USB_SUSPEND |
55 | static int usb_autosuspend_delay = 2; /* Default delay value, | |
56 | * in seconds */ | |
eaafbc3a | 57 | module_param_named(autosuspend, usb_autosuspend_delay, int, 0644); |
b5e795f8 AS |
58 | MODULE_PARM_DESC(autosuspend, "default autosuspend delay"); |
59 | ||
60 | #else | |
61 | #define usb_autosuspend_delay 0 | |
62 | #endif | |
63 | ||
1da177e4 | 64 | |
1da177e4 LT |
65 | /** |
66 | * usb_ifnum_to_if - get the interface object with a given interface number | |
67 | * @dev: the device whose current configuration is considered | |
68 | * @ifnum: the desired interface | |
69 | * | |
70 | * This walks the device descriptor for the currently active configuration | |
71 | * and returns a pointer to the interface with that particular interface | |
72 | * number, or null. | |
73 | * | |
74 | * Note that configuration descriptors are not required to assign interface | |
75 | * numbers sequentially, so that it would be incorrect to assume that | |
76 | * the first interface in that descriptor corresponds to interface zero. | |
77 | * This routine helps device drivers avoid such mistakes. | |
78 | * However, you should make sure that you do the right thing with any | |
79 | * alternate settings available for this interfaces. | |
80 | * | |
81 | * Don't call this function unless you are bound to one of the interfaces | |
82 | * on this device or you have locked the device! | |
83 | */ | |
095bc335 LFC |
84 | struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev, |
85 | unsigned ifnum) | |
1da177e4 LT |
86 | { |
87 | struct usb_host_config *config = dev->actconfig; | |
88 | int i; | |
89 | ||
90 | if (!config) | |
91 | return NULL; | |
92 | for (i = 0; i < config->desc.bNumInterfaces; i++) | |
93 | if (config->interface[i]->altsetting[0] | |
94 | .desc.bInterfaceNumber == ifnum) | |
95 | return config->interface[i]; | |
96 | ||
97 | return NULL; | |
98 | } | |
99 | ||
100 | /** | |
101 | * usb_altnum_to_altsetting - get the altsetting structure with a given | |
102 | * alternate setting number. | |
103 | * @intf: the interface containing the altsetting in question | |
104 | * @altnum: the desired alternate setting number | |
105 | * | |
106 | * This searches the altsetting array of the specified interface for | |
107 | * an entry with the correct bAlternateSetting value and returns a pointer | |
108 | * to that entry, or null. | |
109 | * | |
110 | * Note that altsettings need not be stored sequentially by number, so | |
111 | * it would be incorrect to assume that the first altsetting entry in | |
112 | * the array corresponds to altsetting zero. This routine helps device | |
113 | * drivers avoid such mistakes. | |
114 | * | |
115 | * Don't call this function unless you are bound to the intf interface | |
116 | * or you have locked the device! | |
117 | */ | |
095bc335 LFC |
118 | struct usb_host_interface *usb_altnum_to_altsetting(const struct usb_interface *intf, |
119 | unsigned int altnum) | |
1da177e4 LT |
120 | { |
121 | int i; | |
122 | ||
123 | for (i = 0; i < intf->num_altsetting; i++) { | |
124 | if (intf->altsetting[i].desc.bAlternateSetting == altnum) | |
125 | return &intf->altsetting[i]; | |
126 | } | |
127 | return NULL; | |
128 | } | |
129 | ||
f5691d70 PZ |
130 | struct find_interface_arg { |
131 | int minor; | |
132 | struct usb_interface *interface; | |
133 | }; | |
1da177e4 | 134 | |
6034a080 PM |
135 | static int __find_interface(struct device * dev, void * data) |
136 | { | |
f5691d70 PZ |
137 | struct find_interface_arg *arg = data; |
138 | struct usb_interface *intf; | |
6034a080 PM |
139 | |
140 | /* can't look at usb devices, only interfaces */ | |
8bb54ab5 | 141 | if (is_usb_device(dev)) |
6034a080 PM |
142 | return 0; |
143 | ||
144 | intf = to_usb_interface(dev); | |
f5691d70 PZ |
145 | if (intf->minor != -1 && intf->minor == arg->minor) { |
146 | arg->interface = intf; | |
6034a080 PM |
147 | return 1; |
148 | } | |
149 | return 0; | |
150 | } | |
151 | ||
1da177e4 LT |
152 | /** |
153 | * usb_find_interface - find usb_interface pointer for driver and device | |
154 | * @drv: the driver whose current configuration is considered | |
155 | * @minor: the minor number of the desired device | |
156 | * | |
157 | * This walks the driver device list and returns a pointer to the interface | |
158 | * with the matching minor. Note, this only works for devices that share the | |
159 | * USB major number. | |
160 | */ | |
161 | struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor) | |
162 | { | |
f5691d70 | 163 | struct find_interface_arg argb; |
1b21d5e1 | 164 | int retval; |
1da177e4 | 165 | |
f5691d70 PZ |
166 | argb.minor = minor; |
167 | argb.interface = NULL; | |
1b21d5e1 GKH |
168 | /* eat the error, it will be in argb.interface */ |
169 | retval = driver_for_each_device(&drv->drvwrap.driver, NULL, &argb, | |
170 | __find_interface); | |
f5691d70 | 171 | return argb.interface; |
1da177e4 LT |
172 | } |
173 | ||
1da177e4 LT |
174 | /** |
175 | * usb_release_dev - free a usb device structure when all users of it are finished. | |
176 | * @dev: device that's been disconnected | |
177 | * | |
178 | * Will be called only by the device core when all users of this usb device are | |
179 | * done. | |
180 | */ | |
181 | static void usb_release_dev(struct device *dev) | |
182 | { | |
183 | struct usb_device *udev; | |
184 | ||
185 | udev = to_usb_device(dev); | |
186 | ||
bd859281 | 187 | #ifdef CONFIG_USB_SUSPEND |
645daaab | 188 | cancel_delayed_work(&udev->autosuspend); |
bd859281 | 189 | flush_workqueue(ksuspend_usb_wq); |
645daaab | 190 | #endif |
1da177e4 | 191 | usb_destroy_configuration(udev); |
17200583 | 192 | usb_put_hcd(bus_to_hcd(udev->bus)); |
1da177e4 LT |
193 | kfree(udev->product); |
194 | kfree(udev->manufacturer); | |
195 | kfree(udev->serial); | |
196 | kfree(udev); | |
197 | } | |
198 | ||
9f8b17e6 KS |
199 | struct device_type usb_device_type = { |
200 | .name = "usb_device", | |
201 | .release = usb_release_dev, | |
202 | }; | |
203 | ||
645daaab AS |
204 | #ifdef CONFIG_PM |
205 | ||
bd859281 AS |
206 | static int ksuspend_usb_init(void) |
207 | { | |
208 | ksuspend_usb_wq = create_singlethread_workqueue("ksuspend_usbd"); | |
209 | if (!ksuspend_usb_wq) | |
210 | return -ENOMEM; | |
211 | return 0; | |
212 | } | |
213 | ||
214 | static void ksuspend_usb_cleanup(void) | |
215 | { | |
216 | destroy_workqueue(ksuspend_usb_wq); | |
217 | } | |
218 | ||
db063507 AS |
219 | #else |
220 | ||
221 | #define ksuspend_usb_init() 0 | |
222 | #define ksuspend_usb_cleanup() do {} while (0) | |
223 | ||
224 | #endif /* CONFIG_PM */ | |
645daaab | 225 | |
1da177e4 LT |
226 | /** |
227 | * usb_alloc_dev - usb device constructor (usbcore-internal) | |
228 | * @parent: hub to which device is connected; null to allocate a root hub | |
229 | * @bus: bus used to access the device | |
230 | * @port1: one-based index of port; ignored for root hubs | |
9251644a | 231 | * Context: !in_interrupt() |
1da177e4 LT |
232 | * |
233 | * Only hub drivers (including virtual root hub drivers for host | |
234 | * controllers) should ever call this. | |
235 | * | |
236 | * This call may not be used in a non-sleeping context. | |
237 | */ | |
238 | struct usb_device * | |
239 | usb_alloc_dev(struct usb_device *parent, struct usb_bus *bus, unsigned port1) | |
240 | { | |
241 | struct usb_device *dev; | |
242 | ||
0a1ef3b5 | 243 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
1da177e4 LT |
244 | if (!dev) |
245 | return NULL; | |
246 | ||
17200583 | 247 | if (!usb_get_hcd(bus_to_hcd(bus))) { |
1da177e4 LT |
248 | kfree(dev); |
249 | return NULL; | |
250 | } | |
251 | ||
252 | device_initialize(&dev->dev); | |
253 | dev->dev.bus = &usb_bus_type; | |
9f8b17e6 | 254 | dev->dev.type = &usb_device_type; |
1da177e4 | 255 | dev->dev.dma_mask = bus->controller->dma_mask; |
1da177e4 LT |
256 | dev->state = USB_STATE_ATTACHED; |
257 | ||
258 | INIT_LIST_HEAD(&dev->ep0.urb_list); | |
259 | dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE; | |
260 | dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT; | |
261 | /* ep0 maxpacket comes later, from device descriptor */ | |
262 | dev->ep_in[0] = dev->ep_out[0] = &dev->ep0; | |
263 | ||
264 | /* Save readable and stable topology id, distinguishing devices | |
265 | * by location for diagnostics, tools, driver model, etc. The | |
266 | * string is a path along hub ports, from the root. Each device's | |
267 | * dev->devpath will be stable until USB is re-cabled, and hubs | |
268 | * are often labeled with these port numbers. The bus_id isn't | |
269 | * as stable: bus->busnum changes easily from modprobe order, | |
270 | * cardbus or pci hotplugging, and so on. | |
271 | */ | |
9251644a ON |
272 | if (unlikely(!parent)) { |
273 | dev->devpath[0] = '0'; | |
1da177e4 LT |
274 | |
275 | dev->dev.parent = bus->controller; | |
9251644a | 276 | sprintf(&dev->dev.bus_id[0], "usb%d", bus->busnum); |
1da177e4 LT |
277 | } else { |
278 | /* match any labeling on the hubs; it's one-based */ | |
9251644a ON |
279 | if (parent->devpath[0] == '0') |
280 | snprintf(dev->devpath, sizeof dev->devpath, | |
1da177e4 LT |
281 | "%d", port1); |
282 | else | |
9251644a | 283 | snprintf(dev->devpath, sizeof dev->devpath, |
1da177e4 LT |
284 | "%s.%d", parent->devpath, port1); |
285 | ||
286 | dev->dev.parent = &parent->dev; | |
9251644a | 287 | sprintf(&dev->dev.bus_id[0], "%d-%s", |
1da177e4 LT |
288 | bus->busnum, dev->devpath); |
289 | ||
290 | /* hub driver sets up TT records */ | |
291 | } | |
292 | ||
12c3da34 | 293 | dev->portnum = port1; |
1da177e4 LT |
294 | dev->bus = bus; |
295 | dev->parent = parent; | |
296 | INIT_LIST_HEAD(&dev->filelist); | |
297 | ||
645daaab AS |
298 | #ifdef CONFIG_PM |
299 | mutex_init(&dev->pm_mutex); | |
c4028958 | 300 | INIT_DELAYED_WORK(&dev->autosuspend, usb_autosuspend_work); |
b5e795f8 | 301 | dev->autosuspend_delay = usb_autosuspend_delay * HZ; |
645daaab | 302 | #endif |
1da177e4 LT |
303 | return dev; |
304 | } | |
305 | ||
306 | /** | |
307 | * usb_get_dev - increments the reference count of the usb device structure | |
308 | * @dev: the device being referenced | |
309 | * | |
310 | * Each live reference to a device should be refcounted. | |
311 | * | |
312 | * Drivers for USB interfaces should normally record such references in | |
313 | * their probe() methods, when they bind to an interface, and release | |
314 | * them by calling usb_put_dev(), in their disconnect() methods. | |
315 | * | |
316 | * A pointer to the device with the incremented reference counter is returned. | |
317 | */ | |
318 | struct usb_device *usb_get_dev(struct usb_device *dev) | |
319 | { | |
320 | if (dev) | |
321 | get_device(&dev->dev); | |
322 | return dev; | |
323 | } | |
324 | ||
325 | /** | |
326 | * usb_put_dev - release a use of the usb device structure | |
327 | * @dev: device that's been disconnected | |
328 | * | |
329 | * Must be called when a user of a device is finished with it. When the last | |
330 | * user of the device calls this function, the memory of the device is freed. | |
331 | */ | |
332 | void usb_put_dev(struct usb_device *dev) | |
333 | { | |
334 | if (dev) | |
335 | put_device(&dev->dev); | |
336 | } | |
337 | ||
338 | /** | |
339 | * usb_get_intf - increments the reference count of the usb interface structure | |
340 | * @intf: the interface being referenced | |
341 | * | |
342 | * Each live reference to a interface must be refcounted. | |
343 | * | |
344 | * Drivers for USB interfaces should normally record such references in | |
345 | * their probe() methods, when they bind to an interface, and release | |
346 | * them by calling usb_put_intf(), in their disconnect() methods. | |
347 | * | |
348 | * A pointer to the interface with the incremented reference counter is | |
349 | * returned. | |
350 | */ | |
351 | struct usb_interface *usb_get_intf(struct usb_interface *intf) | |
352 | { | |
353 | if (intf) | |
354 | get_device(&intf->dev); | |
355 | return intf; | |
356 | } | |
357 | ||
358 | /** | |
359 | * usb_put_intf - release a use of the usb interface structure | |
360 | * @intf: interface that's been decremented | |
361 | * | |
362 | * Must be called when a user of an interface is finished with it. When the | |
363 | * last user of the interface calls this function, the memory of the interface | |
364 | * is freed. | |
365 | */ | |
366 | void usb_put_intf(struct usb_interface *intf) | |
367 | { | |
368 | if (intf) | |
369 | put_device(&intf->dev); | |
370 | } | |
371 | ||
372 | ||
373 | /* USB device locking | |
374 | * | |
9ad3d6cc AS |
375 | * USB devices and interfaces are locked using the semaphore in their |
376 | * embedded struct device. The hub driver guarantees that whenever a | |
377 | * device is connected or disconnected, drivers are called with the | |
378 | * USB device locked as well as their particular interface. | |
1da177e4 LT |
379 | * |
380 | * Complications arise when several devices are to be locked at the same | |
381 | * time. Only hub-aware drivers that are part of usbcore ever have to | |
9ad3d6cc AS |
382 | * do this; nobody else needs to worry about it. The rule for locking |
383 | * is simple: | |
1da177e4 LT |
384 | * |
385 | * When locking both a device and its parent, always lock the | |
386 | * the parent first. | |
387 | */ | |
388 | ||
1da177e4 LT |
389 | /** |
390 | * usb_lock_device_for_reset - cautiously acquire the lock for a | |
391 | * usb device structure | |
392 | * @udev: device that's being locked | |
393 | * @iface: interface bound to the driver making the request (optional) | |
394 | * | |
395 | * Attempts to acquire the device lock, but fails if the device is | |
396 | * NOTATTACHED or SUSPENDED, or if iface is specified and the interface | |
397 | * is neither BINDING nor BOUND. Rather than sleeping to wait for the | |
398 | * lock, the routine polls repeatedly. This is to prevent deadlock with | |
399 | * disconnect; in some drivers (such as usb-storage) the disconnect() | |
3ea15966 | 400 | * or suspend() method will block waiting for a device reset to complete. |
1da177e4 LT |
401 | * |
402 | * Returns a negative error code for failure, otherwise 1 or 0 to indicate | |
403 | * that the device will or will not have to be unlocked. (0 can be | |
404 | * returned when an interface is given and is BINDING, because in that | |
405 | * case the driver already owns the device lock.) | |
406 | */ | |
407 | int usb_lock_device_for_reset(struct usb_device *udev, | |
095bc335 | 408 | const struct usb_interface *iface) |
1da177e4 | 409 | { |
3ea15966 AS |
410 | unsigned long jiffies_expire = jiffies + HZ; |
411 | ||
1da177e4 LT |
412 | if (udev->state == USB_STATE_NOTATTACHED) |
413 | return -ENODEV; | |
414 | if (udev->state == USB_STATE_SUSPENDED) | |
415 | return -EHOSTUNREACH; | |
416 | if (iface) { | |
417 | switch (iface->condition) { | |
418 | case USB_INTERFACE_BINDING: | |
419 | return 0; | |
420 | case USB_INTERFACE_BOUND: | |
421 | break; | |
422 | default: | |
423 | return -EINTR; | |
424 | } | |
425 | } | |
426 | ||
9ad3d6cc | 427 | while (usb_trylock_device(udev) != 0) { |
3ea15966 AS |
428 | |
429 | /* If we can't acquire the lock after waiting one second, | |
430 | * we're probably deadlocked */ | |
431 | if (time_after(jiffies, jiffies_expire)) | |
432 | return -EBUSY; | |
433 | ||
1da177e4 LT |
434 | msleep(15); |
435 | if (udev->state == USB_STATE_NOTATTACHED) | |
436 | return -ENODEV; | |
437 | if (udev->state == USB_STATE_SUSPENDED) | |
438 | return -EHOSTUNREACH; | |
439 | if (iface && iface->condition != USB_INTERFACE_BOUND) | |
440 | return -EINTR; | |
441 | } | |
442 | return 1; | |
443 | } | |
444 | ||
1da177e4 LT |
445 | |
446 | static struct usb_device *match_device(struct usb_device *dev, | |
447 | u16 vendor_id, u16 product_id) | |
448 | { | |
449 | struct usb_device *ret_dev = NULL; | |
450 | int child; | |
451 | ||
452 | dev_dbg(&dev->dev, "check for vendor %04x, product %04x ...\n", | |
453 | le16_to_cpu(dev->descriptor.idVendor), | |
454 | le16_to_cpu(dev->descriptor.idProduct)); | |
455 | ||
456 | /* see if this device matches */ | |
457 | if ((vendor_id == le16_to_cpu(dev->descriptor.idVendor)) && | |
458 | (product_id == le16_to_cpu(dev->descriptor.idProduct))) { | |
9251644a | 459 | dev_dbg(&dev->dev, "matched this device!\n"); |
1da177e4 LT |
460 | ret_dev = usb_get_dev(dev); |
461 | goto exit; | |
462 | } | |
463 | ||
464 | /* look through all of the children of this device */ | |
465 | for (child = 0; child < dev->maxchild; ++child) { | |
466 | if (dev->children[child]) { | |
9ad3d6cc | 467 | usb_lock_device(dev->children[child]); |
1da177e4 LT |
468 | ret_dev = match_device(dev->children[child], |
469 | vendor_id, product_id); | |
9ad3d6cc | 470 | usb_unlock_device(dev->children[child]); |
1da177e4 LT |
471 | if (ret_dev) |
472 | goto exit; | |
473 | } | |
474 | } | |
475 | exit: | |
476 | return ret_dev; | |
477 | } | |
478 | ||
479 | /** | |
480 | * usb_find_device - find a specific usb device in the system | |
481 | * @vendor_id: the vendor id of the device to find | |
482 | * @product_id: the product id of the device to find | |
483 | * | |
484 | * Returns a pointer to a struct usb_device if such a specified usb | |
485 | * device is present in the system currently. The usage count of the | |
486 | * device will be incremented if a device is found. Make sure to call | |
487 | * usb_put_dev() when the caller is finished with the device. | |
488 | * | |
489 | * If a device with the specified vendor and product id is not found, | |
490 | * NULL is returned. | |
491 | */ | |
492 | struct usb_device *usb_find_device(u16 vendor_id, u16 product_id) | |
493 | { | |
494 | struct list_head *buslist; | |
495 | struct usb_bus *bus; | |
496 | struct usb_device *dev = NULL; | |
497 | ||
4186ecf8 | 498 | mutex_lock(&usb_bus_list_lock); |
1da177e4 LT |
499 | for (buslist = usb_bus_list.next; |
500 | buslist != &usb_bus_list; | |
501 | buslist = buslist->next) { | |
502 | bus = container_of(buslist, struct usb_bus, bus_list); | |
503 | if (!bus->root_hub) | |
504 | continue; | |
505 | usb_lock_device(bus->root_hub); | |
506 | dev = match_device(bus->root_hub, vendor_id, product_id); | |
507 | usb_unlock_device(bus->root_hub); | |
508 | if (dev) | |
509 | goto exit; | |
510 | } | |
511 | exit: | |
4186ecf8 | 512 | mutex_unlock(&usb_bus_list_lock); |
1da177e4 LT |
513 | return dev; |
514 | } | |
515 | ||
516 | /** | |
517 | * usb_get_current_frame_number - return current bus frame number | |
518 | * @dev: the device whose bus is being queried | |
519 | * | |
520 | * Returns the current frame number for the USB host controller | |
521 | * used with the given USB device. This can be used when scheduling | |
522 | * isochronous requests. | |
523 | * | |
524 | * Note that different kinds of host controller have different | |
525 | * "scheduling horizons". While one type might support scheduling only | |
526 | * 32 frames into the future, others could support scheduling up to | |
527 | * 1024 frames into the future. | |
528 | */ | |
529 | int usb_get_current_frame_number(struct usb_device *dev) | |
530 | { | |
9251644a | 531 | return usb_hcd_get_frame_number(dev); |
1da177e4 LT |
532 | } |
533 | ||
534 | /*-------------------------------------------------------------------*/ | |
535 | /* | |
536 | * __usb_get_extra_descriptor() finds a descriptor of specific type in the | |
537 | * extra field of the interface and endpoint descriptor structs. | |
538 | */ | |
539 | ||
540 | int __usb_get_extra_descriptor(char *buffer, unsigned size, | |
541 | unsigned char type, void **ptr) | |
542 | { | |
543 | struct usb_descriptor_header *header; | |
544 | ||
545 | while (size >= sizeof(struct usb_descriptor_header)) { | |
546 | header = (struct usb_descriptor_header *)buffer; | |
547 | ||
548 | if (header->bLength < 2) { | |
549 | printk(KERN_ERR | |
550 | "%s: bogus descriptor, type %d length %d\n", | |
551 | usbcore_name, | |
552 | header->bDescriptorType, | |
553 | header->bLength); | |
554 | return -1; | |
555 | } | |
556 | ||
557 | if (header->bDescriptorType == type) { | |
558 | *ptr = header; | |
559 | return 0; | |
560 | } | |
561 | ||
562 | buffer += header->bLength; | |
563 | size -= header->bLength; | |
564 | } | |
565 | return -1; | |
566 | } | |
567 | ||
568 | /** | |
569 | * usb_buffer_alloc - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP | |
570 | * @dev: device the buffer will be used with | |
571 | * @size: requested buffer size | |
572 | * @mem_flags: affect whether allocation may block | |
573 | * @dma: used to return DMA address of buffer | |
574 | * | |
575 | * Return value is either null (indicating no buffer could be allocated), or | |
576 | * the cpu-space pointer to a buffer that may be used to perform DMA to the | |
577 | * specified device. Such cpu-space buffers are returned along with the DMA | |
578 | * address (through the pointer provided). | |
579 | * | |
580 | * These buffers are used with URB_NO_xxx_DMA_MAP set in urb->transfer_flags | |
581 | * to avoid behaviors like using "DMA bounce buffers", or tying down I/O | |
582 | * mapping hardware for long idle periods. The implementation varies between | |
583 | * platforms, depending on details of how DMA will work to this device. | |
584 | * Using these buffers also helps prevent cacheline sharing problems on | |
585 | * architectures where CPU caches are not DMA-coherent. | |
586 | * | |
587 | * When the buffer is no longer used, free it with usb_buffer_free(). | |
588 | */ | |
9251644a | 589 | void *usb_buffer_alloc( |
1da177e4 LT |
590 | struct usb_device *dev, |
591 | size_t size, | |
55016f10 | 592 | gfp_t mem_flags, |
1da177e4 LT |
593 | dma_addr_t *dma |
594 | ) | |
595 | { | |
a6d2bb9f | 596 | if (!dev || !dev->bus) |
1da177e4 | 597 | return NULL; |
9251644a | 598 | return hcd_buffer_alloc(dev->bus, size, mem_flags, dma); |
1da177e4 LT |
599 | } |
600 | ||
601 | /** | |
602 | * usb_buffer_free - free memory allocated with usb_buffer_alloc() | |
603 | * @dev: device the buffer was used with | |
604 | * @size: requested buffer size | |
605 | * @addr: CPU address of buffer | |
606 | * @dma: DMA address of buffer | |
607 | * | |
608 | * This reclaims an I/O buffer, letting it be reused. The memory must have | |
609 | * been allocated using usb_buffer_alloc(), and the parameters must match | |
610 | * those provided in that allocation request. | |
611 | */ | |
9251644a | 612 | void usb_buffer_free( |
1da177e4 LT |
613 | struct usb_device *dev, |
614 | size_t size, | |
615 | void *addr, | |
616 | dma_addr_t dma | |
617 | ) | |
618 | { | |
a6d2bb9f | 619 | if (!dev || !dev->bus) |
b94badbb DT |
620 | return; |
621 | if (!addr) | |
622 | return; | |
9251644a | 623 | hcd_buffer_free(dev->bus, size, addr, dma); |
1da177e4 LT |
624 | } |
625 | ||
626 | /** | |
627 | * usb_buffer_map - create DMA mapping(s) for an urb | |
628 | * @urb: urb whose transfer_buffer/setup_packet will be mapped | |
629 | * | |
630 | * Return value is either null (indicating no buffer could be mapped), or | |
631 | * the parameter. URB_NO_TRANSFER_DMA_MAP and URB_NO_SETUP_DMA_MAP are | |
632 | * added to urb->transfer_flags if the operation succeeds. If the device | |
633 | * is connected to this system through a non-DMA controller, this operation | |
634 | * always succeeds. | |
635 | * | |
636 | * This call would normally be used for an urb which is reused, perhaps | |
637 | * as the target of a large periodic transfer, with usb_buffer_dmasync() | |
638 | * calls to synchronize memory and dma state. | |
639 | * | |
640 | * Reverse the effect of this call with usb_buffer_unmap(). | |
641 | */ | |
642 | #if 0 | |
9251644a | 643 | struct urb *usb_buffer_map(struct urb *urb) |
1da177e4 LT |
644 | { |
645 | struct usb_bus *bus; | |
646 | struct device *controller; | |
647 | ||
648 | if (!urb | |
649 | || !urb->dev | |
650 | || !(bus = urb->dev->bus) | |
651 | || !(controller = bus->controller)) | |
652 | return NULL; | |
653 | ||
654 | if (controller->dma_mask) { | |
9251644a | 655 | urb->transfer_dma = dma_map_single(controller, |
1da177e4 | 656 | urb->transfer_buffer, urb->transfer_buffer_length, |
9251644a | 657 | usb_pipein(urb->pipe) |
1da177e4 | 658 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
9251644a ON |
659 | if (usb_pipecontrol(urb->pipe)) |
660 | urb->setup_dma = dma_map_single(controller, | |
1da177e4 | 661 | urb->setup_packet, |
9251644a | 662 | sizeof(struct usb_ctrlrequest), |
1da177e4 LT |
663 | DMA_TO_DEVICE); |
664 | // FIXME generic api broken like pci, can't report errors | |
665 | // if (urb->transfer_dma == DMA_ADDR_INVALID) return 0; | |
666 | } else | |
667 | urb->transfer_dma = ~0; | |
668 | urb->transfer_flags |= (URB_NO_TRANSFER_DMA_MAP | |
669 | | URB_NO_SETUP_DMA_MAP); | |
670 | return urb; | |
671 | } | |
672 | #endif /* 0 */ | |
673 | ||
674 | /* XXX DISABLED, no users currently. If you wish to re-enable this | |
675 | * XXX please determine whether the sync is to transfer ownership of | |
676 | * XXX the buffer from device to cpu or vice verse, and thusly use the | |
677 | * XXX appropriate _for_{cpu,device}() method. -DaveM | |
678 | */ | |
679 | #if 0 | |
680 | ||
681 | /** | |
682 | * usb_buffer_dmasync - synchronize DMA and CPU view of buffer(s) | |
683 | * @urb: urb whose transfer_buffer/setup_packet will be synchronized | |
684 | */ | |
9251644a | 685 | void usb_buffer_dmasync(struct urb *urb) |
1da177e4 LT |
686 | { |
687 | struct usb_bus *bus; | |
688 | struct device *controller; | |
689 | ||
690 | if (!urb | |
691 | || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) | |
692 | || !urb->dev | |
693 | || !(bus = urb->dev->bus) | |
694 | || !(controller = bus->controller)) | |
695 | return; | |
696 | ||
697 | if (controller->dma_mask) { | |
9251644a | 698 | dma_sync_single(controller, |
1da177e4 | 699 | urb->transfer_dma, urb->transfer_buffer_length, |
9251644a | 700 | usb_pipein(urb->pipe) |
1da177e4 | 701 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
9251644a ON |
702 | if (usb_pipecontrol(urb->pipe)) |
703 | dma_sync_single(controller, | |
1da177e4 | 704 | urb->setup_dma, |
9251644a | 705 | sizeof(struct usb_ctrlrequest), |
1da177e4 LT |
706 | DMA_TO_DEVICE); |
707 | } | |
708 | } | |
709 | #endif | |
710 | ||
711 | /** | |
712 | * usb_buffer_unmap - free DMA mapping(s) for an urb | |
713 | * @urb: urb whose transfer_buffer will be unmapped | |
714 | * | |
715 | * Reverses the effect of usb_buffer_map(). | |
716 | */ | |
717 | #if 0 | |
9251644a | 718 | void usb_buffer_unmap(struct urb *urb) |
1da177e4 LT |
719 | { |
720 | struct usb_bus *bus; | |
721 | struct device *controller; | |
722 | ||
723 | if (!urb | |
724 | || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) | |
725 | || !urb->dev | |
726 | || !(bus = urb->dev->bus) | |
727 | || !(controller = bus->controller)) | |
728 | return; | |
729 | ||
730 | if (controller->dma_mask) { | |
9251644a | 731 | dma_unmap_single(controller, |
1da177e4 | 732 | urb->transfer_dma, urb->transfer_buffer_length, |
9251644a | 733 | usb_pipein(urb->pipe) |
1da177e4 | 734 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
9251644a ON |
735 | if (usb_pipecontrol(urb->pipe)) |
736 | dma_unmap_single(controller, | |
1da177e4 | 737 | urb->setup_dma, |
9251644a | 738 | sizeof(struct usb_ctrlrequest), |
1da177e4 LT |
739 | DMA_TO_DEVICE); |
740 | } | |
741 | urb->transfer_flags &= ~(URB_NO_TRANSFER_DMA_MAP | |
742 | | URB_NO_SETUP_DMA_MAP); | |
743 | } | |
744 | #endif /* 0 */ | |
745 | ||
746 | /** | |
747 | * usb_buffer_map_sg - create scatterlist DMA mapping(s) for an endpoint | |
748 | * @dev: device to which the scatterlist will be mapped | |
749 | * @pipe: endpoint defining the mapping direction | |
750 | * @sg: the scatterlist to map | |
751 | * @nents: the number of entries in the scatterlist | |
752 | * | |
753 | * Return value is either < 0 (indicating no buffers could be mapped), or | |
754 | * the number of DMA mapping array entries in the scatterlist. | |
755 | * | |
756 | * The caller is responsible for placing the resulting DMA addresses from | |
757 | * the scatterlist into URB transfer buffer pointers, and for setting the | |
758 | * URB_NO_TRANSFER_DMA_MAP transfer flag in each of those URBs. | |
759 | * | |
760 | * Top I/O rates come from queuing URBs, instead of waiting for each one | |
761 | * to complete before starting the next I/O. This is particularly easy | |
762 | * to do with scatterlists. Just allocate and submit one URB for each DMA | |
763 | * mapping entry returned, stopping on the first error or when all succeed. | |
764 | * Better yet, use the usb_sg_*() calls, which do that (and more) for you. | |
765 | * | |
766 | * This call would normally be used when translating scatterlist requests, | |
767 | * rather than usb_buffer_map(), since on some hardware (with IOMMUs) it | |
768 | * may be able to coalesce mappings for improved I/O efficiency. | |
769 | * | |
770 | * Reverse the effect of this call with usb_buffer_unmap_sg(). | |
771 | */ | |
095bc335 LFC |
772 | int usb_buffer_map_sg(const struct usb_device *dev, unsigned pipe, |
773 | struct scatterlist *sg, int nents) | |
1da177e4 LT |
774 | { |
775 | struct usb_bus *bus; | |
776 | struct device *controller; | |
777 | ||
778 | if (!dev | |
9251644a | 779 | || usb_pipecontrol(pipe) |
1da177e4 LT |
780 | || !(bus = dev->bus) |
781 | || !(controller = bus->controller) | |
782 | || !controller->dma_mask) | |
783 | return -1; | |
784 | ||
785 | // FIXME generic api broken like pci, can't report errors | |
9251644a ON |
786 | return dma_map_sg(controller, sg, nents, |
787 | usb_pipein(pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE); | |
1da177e4 LT |
788 | } |
789 | ||
790 | /* XXX DISABLED, no users currently. If you wish to re-enable this | |
791 | * XXX please determine whether the sync is to transfer ownership of | |
792 | * XXX the buffer from device to cpu or vice verse, and thusly use the | |
793 | * XXX appropriate _for_{cpu,device}() method. -DaveM | |
794 | */ | |
795 | #if 0 | |
796 | ||
797 | /** | |
798 | * usb_buffer_dmasync_sg - synchronize DMA and CPU view of scatterlist buffer(s) | |
799 | * @dev: device to which the scatterlist will be mapped | |
800 | * @pipe: endpoint defining the mapping direction | |
801 | * @sg: the scatterlist to synchronize | |
802 | * @n_hw_ents: the positive return value from usb_buffer_map_sg | |
803 | * | |
804 | * Use this when you are re-using a scatterlist's data buffers for | |
805 | * another USB request. | |
806 | */ | |
095bc335 LFC |
807 | void usb_buffer_dmasync_sg(const struct usb_device *dev, unsigned pipe, |
808 | struct scatterlist *sg, int n_hw_ents) | |
1da177e4 LT |
809 | { |
810 | struct usb_bus *bus; | |
811 | struct device *controller; | |
812 | ||
813 | if (!dev | |
814 | || !(bus = dev->bus) | |
815 | || !(controller = bus->controller) | |
816 | || !controller->dma_mask) | |
817 | return; | |
818 | ||
9251644a ON |
819 | dma_sync_sg(controller, sg, n_hw_ents, |
820 | usb_pipein(pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE); | |
1da177e4 LT |
821 | } |
822 | #endif | |
823 | ||
824 | /** | |
825 | * usb_buffer_unmap_sg - free DMA mapping(s) for a scatterlist | |
826 | * @dev: device to which the scatterlist will be mapped | |
827 | * @pipe: endpoint defining the mapping direction | |
828 | * @sg: the scatterlist to unmap | |
829 | * @n_hw_ents: the positive return value from usb_buffer_map_sg | |
830 | * | |
831 | * Reverses the effect of usb_buffer_map_sg(). | |
832 | */ | |
095bc335 LFC |
833 | void usb_buffer_unmap_sg(const struct usb_device *dev, unsigned pipe, |
834 | struct scatterlist *sg, int n_hw_ents) | |
1da177e4 LT |
835 | { |
836 | struct usb_bus *bus; | |
837 | struct device *controller; | |
838 | ||
839 | if (!dev | |
840 | || !(bus = dev->bus) | |
841 | || !(controller = bus->controller) | |
842 | || !controller->dma_mask) | |
843 | return; | |
844 | ||
9251644a ON |
845 | dma_unmap_sg(controller, sg, n_hw_ents, |
846 | usb_pipein(pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE); | |
1da177e4 LT |
847 | } |
848 | ||
1da177e4 | 849 | /* format to disable USB on kernel command line is: nousb */ |
aafbf24a | 850 | __module_param_call("", nousb, param_set_bool, param_get_bool, &nousb, 0444); |
1da177e4 LT |
851 | |
852 | /* | |
853 | * for external read access to <nousb> | |
854 | */ | |
855 | int usb_disabled(void) | |
856 | { | |
857 | return nousb; | |
858 | } | |
859 | ||
860 | /* | |
861 | * Init | |
862 | */ | |
863 | static int __init usb_init(void) | |
864 | { | |
865 | int retval; | |
866 | if (nousb) { | |
9251644a | 867 | pr_info("%s: USB support disabled\n", usbcore_name); |
1da177e4 LT |
868 | return 0; |
869 | } | |
870 | ||
bd859281 AS |
871 | retval = ksuspend_usb_init(); |
872 | if (retval) | |
873 | goto out; | |
1da177e4 LT |
874 | retval = bus_register(&usb_bus_type); |
875 | if (retval) | |
bd859281 | 876 | goto bus_register_failed; |
1da177e4 LT |
877 | retval = usb_host_init(); |
878 | if (retval) | |
879 | goto host_init_failed; | |
880 | retval = usb_major_init(); | |
881 | if (retval) | |
882 | goto major_init_failed; | |
fbf82fd2 KS |
883 | retval = usb_register(&usbfs_driver); |
884 | if (retval) | |
885 | goto driver_register_failed; | |
9f8b17e6 | 886 | retval = usb_devio_init(); |
fbf82fd2 | 887 | if (retval) |
9f8b17e6 | 888 | goto usb_devio_init_failed; |
1da177e4 LT |
889 | retval = usbfs_init(); |
890 | if (retval) | |
891 | goto fs_init_failed; | |
892 | retval = usb_hub_init(); | |
893 | if (retval) | |
894 | goto hub_init_failed; | |
8bb54ab5 | 895 | retval = usb_register_device_driver(&usb_generic_driver, THIS_MODULE); |
1da177e4 LT |
896 | if (!retval) |
897 | goto out; | |
898 | ||
899 | usb_hub_cleanup(); | |
900 | hub_init_failed: | |
901 | usbfs_cleanup(); | |
902 | fs_init_failed: | |
9f8b17e6 KS |
903 | usb_devio_cleanup(); |
904 | usb_devio_init_failed: | |
fbf82fd2 KS |
905 | usb_deregister(&usbfs_driver); |
906 | driver_register_failed: | |
907 | usb_major_cleanup(); | |
1da177e4 LT |
908 | major_init_failed: |
909 | usb_host_cleanup(); | |
910 | host_init_failed: | |
911 | bus_unregister(&usb_bus_type); | |
bd859281 AS |
912 | bus_register_failed: |
913 | ksuspend_usb_cleanup(); | |
1da177e4 LT |
914 | out: |
915 | return retval; | |
916 | } | |
917 | ||
918 | /* | |
919 | * Cleanup | |
920 | */ | |
921 | static void __exit usb_exit(void) | |
922 | { | |
923 | /* This will matter if shutdown/reboot does exitcalls. */ | |
924 | if (nousb) | |
925 | return; | |
926 | ||
8bb54ab5 | 927 | usb_deregister_device_driver(&usb_generic_driver); |
1da177e4 LT |
928 | usb_major_cleanup(); |
929 | usbfs_cleanup(); | |
fbf82fd2 | 930 | usb_deregister(&usbfs_driver); |
9f8b17e6 | 931 | usb_devio_cleanup(); |
1da177e4 LT |
932 | usb_hub_cleanup(); |
933 | usb_host_cleanup(); | |
934 | bus_unregister(&usb_bus_type); | |
bd859281 | 935 | ksuspend_usb_cleanup(); |
1da177e4 LT |
936 | } |
937 | ||
938 | subsys_initcall(usb_init); | |
939 | module_exit(usb_exit); | |
940 | ||
941 | /* | |
942 | * USB may be built into the kernel or be built as modules. | |
943 | * These symbols are exported for device (or host controller) | |
944 | * driver modules to use. | |
945 | */ | |
946 | ||
1da177e4 LT |
947 | EXPORT_SYMBOL(usb_disabled); |
948 | ||
a3fdf4eb | 949 | EXPORT_SYMBOL_GPL(usb_get_intf); |
950 | EXPORT_SYMBOL_GPL(usb_put_intf); | |
951 | ||
1da177e4 LT |
952 | EXPORT_SYMBOL(usb_put_dev); |
953 | EXPORT_SYMBOL(usb_get_dev); | |
954 | EXPORT_SYMBOL(usb_hub_tt_clear_buffer); | |
955 | ||
1da177e4 | 956 | EXPORT_SYMBOL(usb_lock_device_for_reset); |
1da177e4 | 957 | |
1da177e4 LT |
958 | EXPORT_SYMBOL(usb_find_interface); |
959 | EXPORT_SYMBOL(usb_ifnum_to_if); | |
960 | EXPORT_SYMBOL(usb_altnum_to_altsetting); | |
961 | ||
1da177e4 LT |
962 | EXPORT_SYMBOL(__usb_get_extra_descriptor); |
963 | ||
964 | EXPORT_SYMBOL(usb_find_device); | |
965 | EXPORT_SYMBOL(usb_get_current_frame_number); | |
966 | ||
9251644a ON |
967 | EXPORT_SYMBOL(usb_buffer_alloc); |
968 | EXPORT_SYMBOL(usb_buffer_free); | |
1da177e4 LT |
969 | |
970 | #if 0 | |
9251644a ON |
971 | EXPORT_SYMBOL(usb_buffer_map); |
972 | EXPORT_SYMBOL(usb_buffer_dmasync); | |
973 | EXPORT_SYMBOL(usb_buffer_unmap); | |
1da177e4 LT |
974 | #endif |
975 | ||
9251644a | 976 | EXPORT_SYMBOL(usb_buffer_map_sg); |
1da177e4 | 977 | #if 0 |
9251644a | 978 | EXPORT_SYMBOL(usb_buffer_dmasync_sg); |
1da177e4 | 979 | #endif |
9251644a | 980 | EXPORT_SYMBOL(usb_buffer_unmap_sg); |
1da177e4 LT |
981 | |
982 | MODULE_LICENSE("GPL"); |