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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[deliverable/linux.git] / drivers / usb / core / hcd.c
CommitLineData
1da177e4
LT		 1/*
2 * (C) Copyright Linus Torvalds 1999
3 * (C) Copyright Johannes Erdfelt 1999-2001
4 * (C) Copyright Andreas Gal 1999
5 * (C) Copyright Gregory P. Smith 1999
6 * (C) Copyright Deti Fliegl 1999
7 * (C) Copyright Randy Dunlap 2000
8 * (C) Copyright David Brownell 2000-2002
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 * for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
1da177e4
LT		 25#include <linux/module.h>
26#include <linux/version.h>
27#include <linux/kernel.h>
28#include <linux/slab.h>
29#include <linux/completion.h>
30#include <linux/utsname.h>
31#include <linux/mm.h>
32#include <asm/io.h>
33#include <asm/scatterlist.h>
34#include <linux/device.h>
35#include <linux/dma-mapping.h>
4186ecf8 36#include <linux/mutex.h>
1da177e4
LT		 37#include <asm/irq.h>
38#include <asm/byteorder.h>
64a21d02 39#include <linux/platform_device.h>
1da177e4
LT		 40
41#include <linux/usb.h>
42
43#include "usb.h"
44#include "hcd.h"
45#include "hub.h"
46
47
48// #define USB_BANDWIDTH_MESSAGES
49
50/*-------------------------------------------------------------------------*/
51
52/*
53 * USB Host Controller Driver framework
54 *
55 * Plugs into usbcore (usb_bus) and lets HCDs share code, minimizing
56 * HCD-specific behaviors/bugs.
57 *
58 * This does error checks, tracks devices and urbs, and delegates to a
59 * "hc_driver" only for code (and data) that really needs to know about
60 * hardware differences. That includes root hub registers, i/o queues,
61 * and so on ... but as little else as possible.
62 *
63 * Shared code includes most of the "root hub" code (these are emulated,
64 * though each HC's hardware works differently) and PCI glue, plus request
65 * tracking overhead. The HCD code should only block on spinlocks or on
66 * hardware handshaking; blocking on software events (such as other kernel
67 * threads releasing resources, or completing actions) is all generic.
68 *
69 * Happens the USB 2.0 spec says this would be invisible inside the "USBD",
70 * and includes mostly a "HCDI" (HCD Interface) along with some APIs used
71 * only by the hub driver ... and that neither should be seen or used by
72 * usb client device drivers.
73 *
74 * Contributors of ideas or unattributed patches include: David Brownell,
75 * Roman Weissgaerber, Rory Bolt, Greg Kroah-Hartman, ...
76 *
77 * HISTORY:
78 * 2002-02-21 Pull in most of the usb_bus support from usb.c; some
79 * associated cleanup. "usb_hcd" still != "usb_bus".
80 * 2001-12-12 Initial patch version for Linux 2.5.1 kernel.
81 */
82
83/*-------------------------------------------------------------------------*/
84
85/* host controllers we manage */
86LIST_HEAD (usb_bus_list);
87EXPORT_SYMBOL_GPL (usb_bus_list);
88
89/* used when allocating bus numbers */
90#define USB_MAXBUS 64
91struct usb_busmap {
92 unsigned long busmap [USB_MAXBUS / (8*sizeof (unsigned long))];
93};
94static struct usb_busmap busmap;
95
96/* used when updating list of hcds */
4186ecf8 97DEFINE_MUTEX(usb_bus_list_lock); /* exported only for usbfs */
1da177e4
LT		 98EXPORT_SYMBOL_GPL (usb_bus_list_lock);
99
100/* used for controlling access to virtual root hubs */
101static DEFINE_SPINLOCK(hcd_root_hub_lock);
102
103/* used when updating hcd data */
104static DEFINE_SPINLOCK(hcd_data_lock);
105
106/* wait queue for synchronous unlinks */
107DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue);
108
109/*-------------------------------------------------------------------------*/
110
111/*
112 * Sharable chunks of root hub code.
113 */
114
115/*-------------------------------------------------------------------------*/
116
117#define KERNEL_REL ((LINUX_VERSION_CODE >> 16) & 0x0ff)
118#define KERNEL_VER ((LINUX_VERSION_CODE >> 8) & 0x0ff)
119
120/* usb 2.0 root hub device descriptor */
121static const u8 usb2_rh_dev_descriptor [18] = {
122 0x12, /* __u8 bLength; */
123 0x01, /* __u8 bDescriptorType; Device */
124 0x00, 0x02, /* __le16 bcdUSB; v2.0 */
125
126 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
127 0x00, /* __u8 bDeviceSubClass; */
128 0x01, /* __u8 bDeviceProtocol; [ usb 2.0 single TT ]*/
16f16d11 129 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
1da177e4
LT		 130
131 0x00, 0x00, /* __le16 idVendor; */
132 0x00, 0x00, /* __le16 idProduct; */
133 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
134
135 0x03, /* __u8 iManufacturer; */
136 0x02, /* __u8 iProduct; */
137 0x01, /* __u8 iSerialNumber; */
138 0x01 /* __u8 bNumConfigurations; */
139};
140
141/* no usb 2.0 root hub "device qualifier" descriptor: one speed only */
142
143/* usb 1.1 root hub device descriptor */
144static const u8 usb11_rh_dev_descriptor [18] = {
145 0x12, /* __u8 bLength; */
146 0x01, /* __u8 bDescriptorType; Device */
147 0x10, 0x01, /* __le16 bcdUSB; v1.1 */
148
149 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
150 0x00, /* __u8 bDeviceSubClass; */
151 0x00, /* __u8 bDeviceProtocol; [ low/full speeds only ] */
16f16d11 152 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
1da177e4
LT		 153
154 0x00, 0x00, /* __le16 idVendor; */
155 0x00, 0x00, /* __le16 idProduct; */
156 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
157
158 0x03, /* __u8 iManufacturer; */
159 0x02, /* __u8 iProduct; */
160 0x01, /* __u8 iSerialNumber; */
161 0x01 /* __u8 bNumConfigurations; */
162};
163
164
165/*-------------------------------------------------------------------------*/
166
167/* Configuration descriptors for our root hubs */
168
169static const u8 fs_rh_config_descriptor [] = {
170
171 /* one configuration */
172 0x09, /* __u8 bLength; */
173 0x02, /* __u8 bDescriptorType; Configuration */
174 0x19, 0x00, /* __le16 wTotalLength; */
175 0x01, /* __u8 bNumInterfaces; (1) */
176 0x01, /* __u8 bConfigurationValue; */
177 0x00, /* __u8 iConfiguration; */
178 0xc0, /* __u8 bmAttributes;
179 Bit 7: must be set,
180 6: Self-powered,
181 5: Remote wakeup,
182 4..0: resvd */
183 0x00, /* __u8 MaxPower; */
184
185 /* USB 1.1:
186 * USB 2.0, single TT organization (mandatory):
187 * one interface, protocol 0
188 *
189 * USB 2.0, multiple TT organization (optional):
190 * two interfaces, protocols 1 (like single TT)
191 * and 2 (multiple TT mode) ... config is
192 * sometimes settable
193 * NOT IMPLEMENTED
194 */
195
196 /* one interface */
197 0x09, /* __u8 if_bLength; */
198 0x04, /* __u8 if_bDescriptorType; Interface */
199 0x00, /* __u8 if_bInterfaceNumber; */
200 0x00, /* __u8 if_bAlternateSetting; */
201 0x01, /* __u8 if_bNumEndpoints; */
202 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
203 0x00, /* __u8 if_bInterfaceSubClass; */
204 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
205 0x00, /* __u8 if_iInterface; */
206
207 /* one endpoint (status change endpoint) */
208 0x07, /* __u8 ep_bLength; */
209 0x05, /* __u8 ep_bDescriptorType; Endpoint */
210 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
211 0x03, /* __u8 ep_bmAttributes; Interrupt */
212 0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */
213 0xff /* __u8 ep_bInterval; (255ms -- usb 2.0 spec) */
214};
215
216static const u8 hs_rh_config_descriptor [] = {
217
218 /* one configuration */
219 0x09, /* __u8 bLength; */
220 0x02, /* __u8 bDescriptorType; Configuration */
221 0x19, 0x00, /* __le16 wTotalLength; */
222 0x01, /* __u8 bNumInterfaces; (1) */
223 0x01, /* __u8 bConfigurationValue; */
224 0x00, /* __u8 iConfiguration; */
225 0xc0, /* __u8 bmAttributes;
226 Bit 7: must be set,
227 6: Self-powered,
228 5: Remote wakeup,
229 4..0: resvd */
230 0x00, /* __u8 MaxPower; */
231
232 /* USB 1.1:
233 * USB 2.0, single TT organization (mandatory):
234 * one interface, protocol 0
235 *
236 * USB 2.0, multiple TT organization (optional):
237 * two interfaces, protocols 1 (like single TT)
238 * and 2 (multiple TT mode) ... config is
239 * sometimes settable
240 * NOT IMPLEMENTED
241 */
242
243 /* one interface */
244 0x09, /* __u8 if_bLength; */
245 0x04, /* __u8 if_bDescriptorType; Interface */
246 0x00, /* __u8 if_bInterfaceNumber; */
247 0x00, /* __u8 if_bAlternateSetting; */
248 0x01, /* __u8 if_bNumEndpoints; */
249 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
250 0x00, /* __u8 if_bInterfaceSubClass; */
251 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
252 0x00, /* __u8 if_iInterface; */
253
254 /* one endpoint (status change endpoint) */
255 0x07, /* __u8 ep_bLength; */
256 0x05, /* __u8 ep_bDescriptorType; Endpoint */
257 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
258 0x03, /* __u8 ep_bmAttributes; Interrupt */
88fafff9 259 /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
260 * see hub.c:hub_configure() for details. */
261 (USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
1da177e4
LT		 262 0x0c /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
263};
264
265/*-------------------------------------------------------------------------*/
266
267/*
268 * helper routine for returning string descriptors in UTF-16LE
269 * input can actually be ISO-8859-1; ASCII is its 7-bit subset
270 */
271static int ascii2utf (char *s, u8 *utf, int utfmax)
272{
273 int retval;
274
275 for (retval = 0; *s && utfmax > 1; utfmax -= 2, retval += 2) {
276 *utf++ = *s++;
277 *utf++ = 0;
278 }
279 if (utfmax > 0) {
280 *utf = *s;
281 ++retval;
282 }
283 return retval;
284}
285
286/*
287 * rh_string - provides manufacturer, product and serial strings for root hub
288 * @id: the string ID number (1: serial number, 2: product, 3: vendor)
289 * @hcd: the host controller for this root hub
290 * @type: string describing our driver
291 * @data: return packet in UTF-16 LE
292 * @len: length of the return packet
293 *
294 * Produces either a manufacturer, product or serial number string for the
295 * virtual root hub device.
296 */
297static int rh_string (
298 int id,
299 struct usb_hcd *hcd,
300 u8 *data,
301 int len
302) {
303 char buf [100];
304
305 // language ids
306 if (id == 0) {
307 buf[0] = 4; buf[1] = 3; /* 4 bytes string data */
308 buf[2] = 0x09; buf[3] = 0x04; /* MSFT-speak for "en-us" */
309 len = min (len, 4);
310 memcpy (data, buf, len);
311 return len;
312
313 // serial number
314 } else if (id == 1) {
315 strlcpy (buf, hcd->self.bus_name, sizeof buf);
316
317 // product description
318 } else if (id == 2) {
319 strlcpy (buf, hcd->product_desc, sizeof buf);
320
321 // id 3 == vendor description
322 } else if (id == 3) {
96b644bd
SH		 323 snprintf (buf, sizeof buf, "%s %s %s", init_utsname()->sysname,
324 init_utsname()->release, hcd->driver->description);
1da177e4
LT		 325
326 // unsupported IDs --> "protocol stall"
327 } else
328 return -EPIPE;
329
330 switch (len) { /* All cases fall through */
331 default:
332 len = 2 + ascii2utf (buf, data + 2, len - 2);
333 case 2:
334 data [1] = 3; /* type == string */
335 case 1:
336 data [0] = 2 * (strlen (buf) + 1);
337 case 0:
338 ; /* Compiler wants a statement here */
339 }
340 return len;
341}
342
343
344/* Root hub control transfers execute synchronously */
345static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
346{
347 struct usb_ctrlrequest *cmd;
348 u16 typeReq, wValue, wIndex, wLength;
349 u8 *ubuf = urb->transfer_buffer;
54bee6e1
MP		 350 u8 tbuf [sizeof (struct usb_hub_descriptor)]
351 __attribute__((aligned(4)));
1da177e4
LT		 352 const u8 *bufp = tbuf;
353 int len = 0;
354 int patch_wakeup = 0;
355 unsigned long flags;
356 int status = 0;
357 int n;
358
359 cmd = (struct usb_ctrlrequest *) urb->setup_packet;
360 typeReq = (cmd->bRequestType << 8) | cmd->bRequest;
361 wValue = le16_to_cpu (cmd->wValue);
362 wIndex = le16_to_cpu (cmd->wIndex);
363 wLength = le16_to_cpu (cmd->wLength);
364
365 if (wLength > urb->transfer_buffer_length)
366 goto error;
367
368 urb->actual_length = 0;
369 switch (typeReq) {
370
371 /* DEVICE REQUESTS */
372
fb669cc0
DB		 373 /* The root hub's remote wakeup enable bit is implemented using
374 * driver model wakeup flags. If this system supports wakeup
375 * through USB, userspace may change the default "allow wakeup"
376 * policy through sysfs or these calls.
377 *
378 * Most root hubs support wakeup from downstream devices, for
379 * runtime power management (disabling USB clocks and reducing
380 * VBUS power usage). However, not all of them do so; silicon,
381 * board, and BIOS bugs here are not uncommon, so these can't
382 * be treated quite like external hubs.
383 *
384 * Likewise, not all root hubs will pass wakeup events upstream,
385 * to wake up the whole system. So don't assume root hub and
386 * controller capabilities are identical.
387 */
388
1da177e4 389 case DeviceRequest | USB_REQ_GET_STATUS:
fb669cc0
DB		 390 tbuf [0] = (device_may_wakeup(&hcd->self.root_hub->dev)
391 << USB_DEVICE_REMOTE_WAKEUP)
1da177e4
LT		 392 | (1 << USB_DEVICE_SELF_POWERED);
393 tbuf [1] = 0;
394 len = 2;
395 break;
396 case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
397 if (wValue == USB_DEVICE_REMOTE_WAKEUP)
fb669cc0 398 device_set_wakeup_enable(&hcd->self.root_hub->dev, 0);
1da177e4
LT		 399 else
400 goto error;
401 break;
402 case DeviceOutRequest | USB_REQ_SET_FEATURE:
fb669cc0
DB		 403 if (device_can_wakeup(&hcd->self.root_hub->dev)
404 && wValue == USB_DEVICE_REMOTE_WAKEUP)
405 device_set_wakeup_enable(&hcd->self.root_hub->dev, 1);
1da177e4
LT		 406 else
407 goto error;
408 break;
409 case DeviceRequest | USB_REQ_GET_CONFIGURATION:
410 tbuf [0] = 1;
411 len = 1;
412 /* FALLTHROUGH */
413 case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
414 break;
415 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
416 switch (wValue & 0xff00) {
417 case USB_DT_DEVICE << 8:
418 if (hcd->driver->flags & HCD_USB2)
419 bufp = usb2_rh_dev_descriptor;
420 else if (hcd->driver->flags & HCD_USB11)
421 bufp = usb11_rh_dev_descriptor;
422 else
423 goto error;
424 len = 18;
425 break;
426 case USB_DT_CONFIG << 8:
427 if (hcd->driver->flags & HCD_USB2) {
428 bufp = hs_rh_config_descriptor;
429 len = sizeof hs_rh_config_descriptor;
430 } else {
431 bufp = fs_rh_config_descriptor;
432 len = sizeof fs_rh_config_descriptor;
433 }
fb669cc0 434 if (device_can_wakeup(&hcd->self.root_hub->dev))
1da177e4
LT		 435 patch_wakeup = 1;
436 break;
437 case USB_DT_STRING << 8:
438 n = rh_string (wValue & 0xff, hcd, ubuf, wLength);
439 if (n < 0)
440 goto error;
441 urb->actual_length = n;
442 break;
443 default:
444 goto error;
445 }
446 break;
447 case DeviceRequest | USB_REQ_GET_INTERFACE:
448 tbuf [0] = 0;
449 len = 1;
450 /* FALLTHROUGH */
451 case DeviceOutRequest | USB_REQ_SET_INTERFACE:
452 break;
453 case DeviceOutRequest | USB_REQ_SET_ADDRESS:
454 // wValue == urb->dev->devaddr
455 dev_dbg (hcd->self.controller, "root hub device address %d\n",
456 wValue);
457 break;
458
459 /* INTERFACE REQUESTS (no defined feature/status flags) */
460
461 /* ENDPOINT REQUESTS */
462
463 case EndpointRequest | USB_REQ_GET_STATUS:
464 // ENDPOINT_HALT flag
465 tbuf [0] = 0;
466 tbuf [1] = 0;
467 len = 2;
468 /* FALLTHROUGH */
469 case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
470 case EndpointOutRequest | USB_REQ_SET_FEATURE:
471 dev_dbg (hcd->self.controller, "no endpoint features yet\n");
472 break;
473
474 /* CLASS REQUESTS (and errors) */
475
476 default:
477 /* non-generic request */
b13296c6
DB		 478 switch (typeReq) {
479 case GetHubStatus:
480 case GetPortStatus:
481 len = 4;
482 break;
483 case GetHubDescriptor:
484 len = sizeof (struct usb_hub_descriptor);
485 break;
1da177e4 486 }
b13296c6
DB		 487 status = hcd->driver->hub_control (hcd,
488 typeReq, wValue, wIndex,
489 tbuf, wLength);
1da177e4
LT		 490 break;
491error:
492 /* "protocol stall" on error */
493 status = -EPIPE;
494 }
495
496 if (status) {
497 len = 0;
498 if (status != -EPIPE) {
499 dev_dbg (hcd->self.controller,
500 "CTRL: TypeReq=0x%x val=0x%x "
501 "idx=0x%x len=%d ==> %d\n",
502 typeReq, wValue, wIndex,
b13296c6 503 wLength, status);
1da177e4
LT		 504 }
505 }
506 if (len) {
507 if (urb->transfer_buffer_length < len)
508 len = urb->transfer_buffer_length;
509 urb->actual_length = len;
510 // always USB_DIR_IN, toward host
511 memcpy (ubuf, bufp, len);
512
513 /* report whether RH hardware supports remote wakeup */
514 if (patch_wakeup &&
515 len > offsetof (struct usb_config_descriptor,
516 bmAttributes))
517 ((struct usb_config_descriptor *)ubuf)->bmAttributes
518 |= USB_CONFIG_ATT_WAKEUP;
519 }
520
521 /* any errors get returned through the urb completion */
522 local_irq_save (flags);
523 spin_lock (&urb->lock);
524 if (urb->status == -EINPROGRESS)
525 urb->status = status;
526 spin_unlock (&urb->lock);
7d12e780 527 usb_hcd_giveback_urb (hcd, urb);
1da177e4
LT		 528 local_irq_restore (flags);
529 return 0;
530}
531
532/*-------------------------------------------------------------------------*/
533
534/*
d5926ae7
AS		 535 * Root Hub interrupt transfers are polled using a timer if the
536 * driver requests it; otherwise the driver is responsible for
537 * calling usb_hcd_poll_rh_status() when an event occurs.
1da177e4 538 *
d5926ae7
AS		 539 * Completions are called in_interrupt(), but they may or may not
540 * be in_irq().
1da177e4 541 */
d5926ae7
AS		 542void usb_hcd_poll_rh_status(struct usb_hcd *hcd)
543{
544 struct urb *urb;
545 int length;
546 unsigned long flags;
547 char buffer[4]; /* Any root hubs with > 31 ports? */
1da177e4 548
d5926ae7
AS		 549 if (!hcd->uses_new_polling && !hcd->status_urb)
550 return;
1da177e4 551
d5926ae7
AS		 552 length = hcd->driver->hub_status_data(hcd, buffer);
553 if (length > 0) {
1da177e4 554
d5926ae7
AS		 555 /* try to complete the status urb */
556 local_irq_save (flags);
557 spin_lock(&hcd_root_hub_lock);
558 urb = hcd->status_urb;
559 if (urb) {
560 spin_lock(&urb->lock);
561 if (urb->status == -EINPROGRESS) {
562 hcd->poll_pending = 0;
563 hcd->status_urb = NULL;
564 urb->status = 0;
565 urb->hcpriv = NULL;
566 urb->actual_length = length;
567 memcpy(urb->transfer_buffer, buffer, length);
568 } else /* urb has been unlinked */
569 length = 0;
570 spin_unlock(&urb->lock);
571 } else
572 length = 0;
573 spin_unlock(&hcd_root_hub_lock);
574
575 /* local irqs are always blocked in completions */
576 if (length > 0)
7d12e780 577 usb_hcd_giveback_urb (hcd, urb);
d5926ae7
AS		 578 else
579 hcd->poll_pending = 1;
580 local_irq_restore (flags);
1da177e4
LT		 581 }
582
d5926ae7
AS		 583 /* The USB 2.0 spec says 256 ms. This is close enough and won't
584 * exceed that limit if HZ is 100. */
585 if (hcd->uses_new_polling ? hcd->poll_rh :
586 (length == 0 && hcd->status_urb != NULL))
587 mod_timer (&hcd->rh_timer, jiffies + msecs_to_jiffies(250));
1da177e4 588}
d5926ae7 589EXPORT_SYMBOL_GPL(usb_hcd_poll_rh_status);
1da177e4
LT		 590
591/* timer callback */
d5926ae7
AS		 592static void rh_timer_func (unsigned long _hcd)
593{
594 usb_hcd_poll_rh_status((struct usb_hcd *) _hcd);
595}
596
597/*-------------------------------------------------------------------------*/
1da177e4 598
d5926ae7 599static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb)
1da177e4 600{
d5926ae7 601 int retval;
1da177e4 602 unsigned long flags;
d5926ae7 603 int len = 1 + (urb->dev->maxchild / 8);
1da177e4 604
d5926ae7
AS		 605 spin_lock_irqsave (&hcd_root_hub_lock, flags);
606 if (urb->status != -EINPROGRESS) /* already unlinked */
607 retval = urb->status;
608 else if (hcd->status_urb || urb->transfer_buffer_length < len) {
609 dev_dbg (hcd->self.controller, "not queuing rh status urb\n");
610 retval = -EINVAL;
611 } else {
612 hcd->status_urb = urb;
613 urb->hcpriv = hcd; /* indicate it's queued */
1da177e4 614
d5926ae7
AS		 615 if (!hcd->uses_new_polling)
616 mod_timer (&hcd->rh_timer, jiffies +
617 msecs_to_jiffies(250));
1da177e4 618
d5926ae7
AS		 619 /* If a status change has already occurred, report it ASAP */
620 else if (hcd->poll_pending)
621 mod_timer (&hcd->rh_timer, jiffies);
622 retval = 0;
1da177e4 623 }
d5926ae7
AS		 624 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
625 return retval;
1da177e4
LT		 626}
627
1da177e4
LT		 628static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb)
629{
d5926ae7
AS		 630 if (usb_pipeint (urb->pipe))
631 return rh_queue_status (hcd, urb);
1da177e4
LT		 632 if (usb_pipecontrol (urb->pipe))
633 return rh_call_control (hcd, urb);
d5926ae7 634 return -EINVAL;
1da177e4
LT		 635}
636
637/*-------------------------------------------------------------------------*/
638
455b25fb
AS		 639/* Unlinks of root-hub control URBs are legal, but they don't do anything
640 * since these URBs always execute synchronously.
d5926ae7 641 */
1da177e4
LT		 642static int usb_rh_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
643{
455b25fb 644 unsigned long flags;
1da177e4 645
455b25fb
AS		 646 if (usb_pipeendpoint(urb->pipe) == 0) { /* Control URB */
647 ; /* Do nothing */
d5926ae7
AS		 648
649 } else { /* Status URB */
650 if (!hcd->uses_new_polling)
455b25fb
AS		 651 del_timer (&hcd->rh_timer);
652 local_irq_save (flags);
d5926ae7
AS		 653 spin_lock (&hcd_root_hub_lock);
654 if (urb == hcd->status_urb) {
655 hcd->status_urb = NULL;
656 urb->hcpriv = NULL;
657 } else
658 urb = NULL; /* wasn't fully queued */
659 spin_unlock (&hcd_root_hub_lock);
660 if (urb)
7d12e780 661 usb_hcd_giveback_urb (hcd, urb);
455b25fb 662 local_irq_restore (flags);
d5926ae7 663 }
1da177e4
LT		 664
665 return 0;
666}
667
668/*-------------------------------------------------------------------------*/
669
8561b10f 670static struct class *usb_host_class;
1da177e4
LT		 671
672int usb_host_init(void)
673{
8561b10f 674 int retval = 0;
675
676 usb_host_class = class_create(THIS_MODULE, "usb_host");
677 if (IS_ERR(usb_host_class))
678 retval = PTR_ERR(usb_host_class);
679 return retval;
1da177e4
LT		 680}
681
682void usb_host_cleanup(void)
683{
8561b10f 684 class_destroy(usb_host_class);
1da177e4
LT		 685}
686
687/**
688 * usb_bus_init - shared initialization code
689 * @bus: the bus structure being initialized
690 *
691 * This code is used to initialize a usb_bus structure, memory for which is
692 * separately managed.
693 */
694static void usb_bus_init (struct usb_bus *bus)
695{
696 memset (&bus->devmap, 0, sizeof(struct usb_devmap));
697
698 bus->devnum_next = 1;
699
700 bus->root_hub = NULL;
1da177e4
LT		 701 bus->busnum = -1;
702 bus->bandwidth_allocated = 0;
703 bus->bandwidth_int_reqs = 0;
704 bus->bandwidth_isoc_reqs = 0;
705
706 INIT_LIST_HEAD (&bus->bus_list);
1da177e4
LT		 707}
708
1da177e4
LT		 709/*-------------------------------------------------------------------------*/
710
711/**
712 * usb_register_bus - registers the USB host controller with the usb core
713 * @bus: pointer to the bus to register
714 * Context: !in_interrupt()
715 *
716 * Assigns a bus number, and links the controller into usbcore data
717 * structures so that it can be seen by scanning the bus list.
718 */
719static int usb_register_bus(struct usb_bus *bus)
720{
721 int busnum;
1da177e4 722
4186ecf8 723 mutex_lock(&usb_bus_list_lock);
1da177e4
LT		 724 busnum = find_next_zero_bit (busmap.busmap, USB_MAXBUS, 1);
725 if (busnum < USB_MAXBUS) {
726 set_bit (busnum, busmap.busmap);
727 bus->busnum = busnum;
728 } else {
729 printk (KERN_ERR "%s: too many buses\n", usbcore_name);
4186ecf8 730 mutex_unlock(&usb_bus_list_lock);
1da177e4
LT		 731 return -E2BIG;
732 }
733
53f46542
GKH		 734 bus->class_dev = class_device_create(usb_host_class, NULL, MKDEV(0,0),
735 bus->controller, "usb_host%d", busnum);
8561b10f 736 if (IS_ERR(bus->class_dev)) {
1da177e4 737 clear_bit(busnum, busmap.busmap);
4186ecf8 738 mutex_unlock(&usb_bus_list_lock);
8561b10f 739 return PTR_ERR(bus->class_dev);
1da177e4
LT		 740 }
741
8561b10f 742 class_set_devdata(bus->class_dev, bus);
743
1da177e4
LT		 744 /* Add it to the local list of buses */
745 list_add (&bus->bus_list, &usb_bus_list);
4186ecf8 746 mutex_unlock(&usb_bus_list_lock);
1da177e4 747
3099e75a 748 usb_notify_add_bus(bus);
1da177e4
LT		 749
750 dev_info (bus->controller, "new USB bus registered, assigned bus number %d\n", bus->busnum);
751 return 0;
752}
753
754/**
755 * usb_deregister_bus - deregisters the USB host controller
756 * @bus: pointer to the bus to deregister
757 * Context: !in_interrupt()
758 *
759 * Recycles the bus number, and unlinks the controller from usbcore data
760 * structures so that it won't be seen by scanning the bus list.
761 */
762static void usb_deregister_bus (struct usb_bus *bus)
763{
764 dev_info (bus->controller, "USB bus %d deregistered\n", bus->busnum);
765
766 /*
767 * NOTE: make sure that all the devices are removed by the
768 * controller code, as well as having it call this when cleaning
769 * itself up
770 */
4186ecf8 771 mutex_lock(&usb_bus_list_lock);
1da177e4 772 list_del (&bus->bus_list);
4186ecf8 773 mutex_unlock(&usb_bus_list_lock);
1da177e4 774
3099e75a 775 usb_notify_remove_bus(bus);
1da177e4
LT		 776
777 clear_bit (bus->busnum, busmap.busmap);
778
8561b10f 779 class_device_unregister(bus->class_dev);
1da177e4
LT		 780}
781
782/**
8ec8d20b 783 * register_root_hub - called by usb_add_hcd() to register a root hub
1da177e4
LT		 784 * @hcd: host controller for this root hub
785 *
8ec8d20b 786 * This function registers the root hub with the USB subsystem. It sets up
b1e8f0a6
DB		 787 * the device properly in the device tree and then calls usb_new_device()
788 * to register the usb device. It also assigns the root hub's USB address
789 * (always 1).
1da177e4 790 */
b1e8f0a6 791static int register_root_hub(struct usb_hcd *hcd)
1da177e4
LT		 792{
793 struct device *parent_dev = hcd->self.controller;
b1e8f0a6 794 struct usb_device *usb_dev = hcd->self.root_hub;
1da177e4
LT		 795 const int devnum = 1;
796 int retval;
797
1da177e4
LT		 798 usb_dev->devnum = devnum;
799 usb_dev->bus->devnum_next = devnum + 1;
800 memset (&usb_dev->bus->devmap.devicemap, 0,
801 sizeof usb_dev->bus->devmap.devicemap);
802 set_bit (devnum, usb_dev->bus->devmap.devicemap);
803 usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
804
4186ecf8 805 mutex_lock(&usb_bus_list_lock);
1da177e4
LT		 806
807 usb_dev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
808 retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE);
809 if (retval != sizeof usb_dev->descriptor) {
4186ecf8 810 mutex_unlock(&usb_bus_list_lock);
1da177e4
LT		 811 dev_dbg (parent_dev, "can't read %s device descriptor %d\n",
812 usb_dev->dev.bus_id, retval);
813 return (retval < 0) ? retval : -EMSGSIZE;
814 }
815
1da177e4 816 retval = usb_new_device (usb_dev);
1da177e4 817 if (retval) {
1da177e4
LT		 818 dev_err (parent_dev, "can't register root hub for %s, %d\n",
819 usb_dev->dev.bus_id, retval);
820 }
4186ecf8 821 mutex_unlock(&usb_bus_list_lock);
1da177e4
LT		 822
823 if (retval == 0) {
824 spin_lock_irq (&hcd_root_hub_lock);
825 hcd->rh_registered = 1;
826 spin_unlock_irq (&hcd_root_hub_lock);
827
828 /* Did the HC die before the root hub was registered? */
829 if (hcd->state == HC_STATE_HALT)
830 usb_hc_died (hcd); /* This time clean up */
831 }
832
833 return retval;
834}
1da177e4 835
d5926ae7
AS		 836void usb_enable_root_hub_irq (struct usb_bus *bus)
837{
838 struct usb_hcd *hcd;
839
840 hcd = container_of (bus, struct usb_hcd, self);
d19ac7da 841 if (hcd->driver->hub_irq_enable && hcd->state != HC_STATE_HALT)
d5926ae7
AS		 842 hcd->driver->hub_irq_enable (hcd);
843}
844
1da177e4
LT		 845
846/*-------------------------------------------------------------------------*/
847
848/**
849 * usb_calc_bus_time - approximate periodic transaction time in nanoseconds
850 * @speed: from dev->speed; USB_SPEED_{LOW,FULL,HIGH}
851 * @is_input: true iff the transaction sends data to the host
852 * @isoc: true for isochronous transactions, false for interrupt ones
853 * @bytecount: how many bytes in the transaction.
854 *
855 * Returns approximate bus time in nanoseconds for a periodic transaction.
856 * See USB 2.0 spec section 5.11.3; only periodic transfers need to be
857 * scheduled in software, this function is only used for such scheduling.
858 */
859long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount)
860{
861 unsigned long tmp;
862
863 switch (speed) {
864 case USB_SPEED_LOW: /* INTR only */
865 if (is_input) {
866 tmp = (67667L * (31L + 10L * BitTime (bytecount))) / 1000L;
867 return (64060L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
868 } else {
869 tmp = (66700L * (31L + 10L * BitTime (bytecount))) / 1000L;
870 return (64107L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
871 }
872 case USB_SPEED_FULL: /* ISOC or INTR */
873 if (isoc) {
874 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
875 return (((is_input) ? 7268L : 6265L) + BW_HOST_DELAY + tmp);
876 } else {
877 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
878 return (9107L + BW_HOST_DELAY + tmp);
879 }
880 case USB_SPEED_HIGH: /* ISOC or INTR */
881 // FIXME adjust for input vs output
882 if (isoc)
498f78e6 883 tmp = HS_NSECS_ISO (bytecount);
1da177e4 884 else
498f78e6 885 tmp = HS_NSECS (bytecount);
1da177e4
LT		 886 return tmp;
887 default:
888 pr_debug ("%s: bogus device speed!\n", usbcore_name);
889 return -1;
890 }
891}
892EXPORT_SYMBOL (usb_calc_bus_time);
893
894/*
895 * usb_check_bandwidth():
896 *
897 * old_alloc is from host_controller->bandwidth_allocated in microseconds;
898 * bustime is from calc_bus_time(), but converted to microseconds.
899 *
900 * returns <bustime in us> if successful,
901 * or -ENOSPC if bandwidth request fails.
902 *
903 * FIXME:
904 * This initial implementation does not use Endpoint.bInterval
905 * in managing bandwidth allocation.
906 * It probably needs to be expanded to use Endpoint.bInterval.
907 * This can be done as a later enhancement (correction).
908 *
909 * This will also probably require some kind of
910 * frame allocation tracking...meaning, for example,
911 * that if multiple drivers request interrupts every 10 USB frames,
912 * they don't all have to be allocated at
913 * frame numbers N, N+10, N+20, etc. Some of them could be at
914 * N+11, N+21, N+31, etc., and others at
915 * N+12, N+22, N+32, etc.
916 *
917 * Similarly for isochronous transfers...
918 *
919 * Individual HCDs can schedule more directly ... this logic
920 * is not correct for high speed transfers.
921 */
922int usb_check_bandwidth (struct usb_device *dev, struct urb *urb)
923{
924 unsigned int pipe = urb->pipe;
925 long bustime;
926 int is_in = usb_pipein (pipe);
927 int is_iso = usb_pipeisoc (pipe);
928 int old_alloc = dev->bus->bandwidth_allocated;
929 int new_alloc;
930
931
932 bustime = NS_TO_US (usb_calc_bus_time (dev->speed, is_in, is_iso,
933 usb_maxpacket (dev, pipe, !is_in)));
934 if (is_iso)
935 bustime /= urb->number_of_packets;
936
937 new_alloc = old_alloc + (int) bustime;
938 if (new_alloc > FRAME_TIME_MAX_USECS_ALLOC) {
939#ifdef DEBUG
940 char *mode =
941#ifdef CONFIG_USB_BANDWIDTH
942 "";
943#else
944 "would have ";
945#endif
946 dev_dbg (&dev->dev, "usb_check_bandwidth %sFAILED: %d + %ld = %d usec\n",
947 mode, old_alloc, bustime, new_alloc);
948#endif
949#ifdef CONFIG_USB_BANDWIDTH
950 bustime = -ENOSPC; /* report error */
951#endif
952 }
953
954 return bustime;
955}
956EXPORT_SYMBOL (usb_check_bandwidth);
957
958
959/**
960 * usb_claim_bandwidth - records bandwidth for a periodic transfer
961 * @dev: source/target of request
962 * @urb: request (urb->dev == dev)
963 * @bustime: bandwidth consumed, in (average) microseconds per frame
964 * @isoc: true iff the request is isochronous
965 *
966 * Bus bandwidth reservations are recorded purely for diagnostic purposes.
967 * HCDs are expected not to overcommit periodic bandwidth, and to record such
968 * reservations whenever endpoints are added to the periodic schedule.
969 *
970 * FIXME averaging per-frame is suboptimal. Better to sum over the HCD's
971 * entire periodic schedule ... 32 frames for OHCI, 1024 for UHCI, settable
972 * for EHCI (256/512/1024 frames, default 1024) and have the bus expose how
973 * large its periodic schedule is.
974 */
975void usb_claim_bandwidth (struct usb_device *dev, struct urb *urb, int bustime, int isoc)
976{
977 dev->bus->bandwidth_allocated += bustime;
978 if (isoc)
979 dev->bus->bandwidth_isoc_reqs++;
980 else
981 dev->bus->bandwidth_int_reqs++;
982 urb->bandwidth = bustime;
983
984#ifdef USB_BANDWIDTH_MESSAGES
985 dev_dbg (&dev->dev, "bandwidth alloc increased by %d (%s) to %d for %d requesters\n",
986 bustime,
987 isoc ? "ISOC" : "INTR",
988 dev->bus->bandwidth_allocated,
989 dev->bus->bandwidth_int_reqs + dev->bus->bandwidth_isoc_reqs);
990#endif
991}
992EXPORT_SYMBOL (usb_claim_bandwidth);
993
994
995/**
996 * usb_release_bandwidth - reverses effect of usb_claim_bandwidth()
997 * @dev: source/target of request
998 * @urb: request (urb->dev == dev)
999 * @isoc: true iff the request is isochronous
1000 *
1001 * This records that previously allocated bandwidth has been released.
1002 * Bandwidth is released when endpoints are removed from the host controller's
1003 * periodic schedule.
1004 */
1005void usb_release_bandwidth (struct usb_device *dev, struct urb *urb, int isoc)
1006{
1007 dev->bus->bandwidth_allocated -= urb->bandwidth;
1008 if (isoc)
1009 dev->bus->bandwidth_isoc_reqs--;
1010 else
1011 dev->bus->bandwidth_int_reqs--;
1012
1013#ifdef USB_BANDWIDTH_MESSAGES
1014 dev_dbg (&dev->dev, "bandwidth alloc reduced by %d (%s) to %d for %d requesters\n",
1015 urb->bandwidth,
1016 isoc ? "ISOC" : "INTR",
1017 dev->bus->bandwidth_allocated,
1018 dev->bus->bandwidth_int_reqs + dev->bus->bandwidth_isoc_reqs);
1019#endif
1020 urb->bandwidth = 0;
1021}
1022EXPORT_SYMBOL (usb_release_bandwidth);
1023
1024
1025/*-------------------------------------------------------------------------*/
1026
1027/*
1028 * Generic HC operations.
1029 */
1030
1031/*-------------------------------------------------------------------------*/
1032
1033static void urb_unlink (struct urb *urb)
1034{
1035 unsigned long flags;
1036
1037 /* Release any periodic transfer bandwidth */
1038 if (urb->bandwidth)
1039 usb_release_bandwidth (urb->dev, urb,
1040 usb_pipeisoc (urb->pipe));
1041
1042 /* clear all state linking urb to this dev (and hcd) */
1043
1044 spin_lock_irqsave (&hcd_data_lock, flags);
1045 list_del_init (&urb->urb_list);
1046 spin_unlock_irqrestore (&hcd_data_lock, flags);
1da177e4
LT		 1047}
1048
1049
1050/* may be called in any context with a valid urb->dev usecount
1051 * caller surrenders "ownership" of urb
1052 * expects usb_submit_urb() to have sanity checked and conditioned all
1053 * inputs in the urb
1054 */
a6d2bb9f 1055int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
1da177e4
LT		 1056{
1057 int status;
17200583 1058 struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus);
1da177e4
LT		 1059 struct usb_host_endpoint *ep;
1060 unsigned long flags;
1061
1062 if (!hcd)
1063 return -ENODEV;
1064
1065 usbmon_urb_submit(&hcd->self, urb);
1066
1067 /*
1068 * Atomically queue the urb, first to our records, then to the HCD.
1069 * Access to urb->status is controlled by urb->lock ... changes on
1070 * i/o completion (normal or fault) or unlinking.
1071 */
1072
1073 // FIXME: verify that quiescing hc works right (RH cleans up)
1074
1075 spin_lock_irqsave (&hcd_data_lock, flags);
1076 ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out)
1077 [usb_pipeendpoint(urb->pipe)];
1078 if (unlikely (!ep))
1079 status = -ENOENT;
1080 else if (unlikely (urb->reject))
1081 status = -EPERM;
1082 else switch (hcd->state) {
1083 case HC_STATE_RUNNING:
1084 case HC_STATE_RESUMING:
979d5199 1085doit:
1da177e4
LT		 1086 list_add_tail (&urb->urb_list, &ep->urb_list);
1087 status = 0;
1088 break;
979d5199
DB		 1089 case HC_STATE_SUSPENDED:
1090 /* HC upstream links (register access, wakeup signaling) can work
1091 * even when the downstream links (and DMA etc) are quiesced; let
1092 * usbcore talk to the root hub.
1093 */
1094 if (hcd->self.controller->power.power_state.event == PM_EVENT_ON
1095 && urb->dev->parent == NULL)
1096 goto doit;
1097 /* FALL THROUGH */
1da177e4
LT		 1098 default:
1099 status = -ESHUTDOWN;
1100 break;
1101 }
1102 spin_unlock_irqrestore (&hcd_data_lock, flags);
1103 if (status) {
1104 INIT_LIST_HEAD (&urb->urb_list);
1105 usbmon_urb_submit_error(&hcd->self, urb, status);
1106 return status;
1107 }
1108
1109 /* increment urb's reference count as part of giving it to the HCD
1110 * (which now controls it). HCD guarantees that it either returns
1111 * an error or calls giveback(), but not both.
1112 */
1113 urb = usb_get_urb (urb);
1114 atomic_inc (&urb->use_count);
1115
1116 if (urb->dev == hcd->self.root_hub) {
1117 /* NOTE: requirement on hub callers (usbfs and the hub
1118 * driver, for now) that URBs' urb->transfer_buffer be
1119 * valid and usb_buffer_{sync,unmap}() not be needed, since
1120 * they could clobber root hub response data.
1121 */
1122 status = rh_urb_enqueue (hcd, urb);
1123 goto done;
1124 }
1125
1126 /* lower level hcd code should use *_dma exclusively,
1127 * unless it uses pio or talks to another transport.
1128 */
dd990f16 1129 if (hcd->self.uses_dma) {
1da177e4
LT		 1130 if (usb_pipecontrol (urb->pipe)
1131 && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
1132 urb->setup_dma = dma_map_single (
1133 hcd->self.controller,
1134 urb->setup_packet,
1135 sizeof (struct usb_ctrlrequest),
1136 DMA_TO_DEVICE);
1137 if (urb->transfer_buffer_length != 0
1138 && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP))
1139 urb->transfer_dma = dma_map_single (
1140 hcd->self.controller,
1141 urb->transfer_buffer,
1142 urb->transfer_buffer_length,
1143 usb_pipein (urb->pipe)
1144 ? DMA_FROM_DEVICE
1145 : DMA_TO_DEVICE);
1146 }
1147
1148 status = hcd->driver->urb_enqueue (hcd, ep, urb, mem_flags);
1149done:
1150 if (unlikely (status)) {
1151 urb_unlink (urb);
1152 atomic_dec (&urb->use_count);
1153 if (urb->reject)
1154 wake_up (&usb_kill_urb_queue);
1155 usb_put_urb (urb);
1156 usbmon_urb_submit_error(&hcd->self, urb, status);
1157 }
1158 return status;
1159}
1160
1161/*-------------------------------------------------------------------------*/
1162
1163/* called in any context */
a6d2bb9f 1164int usb_hcd_get_frame_number (struct usb_device *udev)
1da177e4 1165{
17200583
AS		 1166 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
1167
1da177e4
LT		 1168 if (!HC_IS_RUNNING (hcd->state))
1169 return -ESHUTDOWN;
1170 return hcd->driver->get_frame_number (hcd);
1171}
1172
1173/*-------------------------------------------------------------------------*/
1174
1175/* this makes the hcd giveback() the urb more quickly, by kicking it
1176 * off hardware queues (which may take a while) and returning it as
1177 * soon as practical. we've already set up the urb's return status,
1178 * but we can't know if the callback completed already.
1179 */
1180static int
1181unlink1 (struct usb_hcd *hcd, struct urb *urb)
1182{
1183 int value;
1184
1185 if (urb->dev == hcd->self.root_hub)
1186 value = usb_rh_urb_dequeue (hcd, urb);
1187 else {
1188
1189 /* The only reason an HCD might fail this call is if
1190 * it has not yet fully queued the urb to begin with.
1191 * Such failures should be harmless. */
1192 value = hcd->driver->urb_dequeue (hcd, urb);
1193 }
1194
1195 if (value != 0)
1196 dev_dbg (hcd->self.controller, "dequeue %p --> %d\n",
1197 urb, value);
1198 return value;
1199}
1200
1201/*
1202 * called in any context
1203 *
1204 * caller guarantees urb won't be recycled till both unlink()
1205 * and the urb's completion function return
1206 */
a6d2bb9f 1207int usb_hcd_unlink_urb (struct urb *urb, int status)
1da177e4
LT		 1208{
1209 struct usb_host_endpoint *ep;
1210 struct usb_hcd *hcd = NULL;
1211 struct device *sys = NULL;
1212 unsigned long flags;
1213 struct list_head *tmp;
1214 int retval;
1215
1216 if (!urb)
1217 return -EINVAL;
1218 if (!urb->dev || !urb->dev->bus)
1219 return -ENODEV;
1220 ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out)
1221 [usb_pipeendpoint(urb->pipe)];
1222 if (!ep)
1223 return -ENODEV;
1224
1225 /*
1226 * we contend for urb->status with the hcd core,
1227 * which changes it while returning the urb.
1228 *
1229 * Caller guaranteed that the urb pointer hasn't been freed, and
1230 * that it was submitted. But as a rule it can't know whether or
1231 * not it's already been unlinked ... so we respect the reversed
1232 * lock sequence needed for the usb_hcd_giveback_urb() code paths
1233 * (urb lock, then hcd_data_lock) in case some other CPU is now
1234 * unlinking it.
1235 */
1236 spin_lock_irqsave (&urb->lock, flags);
1237 spin_lock (&hcd_data_lock);
1238
1239 sys = &urb->dev->dev;
17200583 1240 hcd = bus_to_hcd(urb->dev->bus);
1da177e4
LT		 1241 if (hcd == NULL) {
1242 retval = -ENODEV;
1243 goto done;
1244 }
1245
1da177e4
LT		 1246 /* insist the urb is still queued */
1247 list_for_each(tmp, &ep->urb_list) {
1248 if (tmp == &urb->urb_list)
1249 break;
1250 }
1251 if (tmp != &urb->urb_list) {
1252 retval = -EIDRM;
1253 goto done;
1254 }
1255
1256 /* Any status except -EINPROGRESS means something already started to
1257 * unlink this URB from the hardware. So there's no more work to do.
1258 */
1259 if (urb->status != -EINPROGRESS) {
1260 retval = -EBUSY;
1261 goto done;
1262 }
1263
1264 /* IRQ setup can easily be broken so that USB controllers
1265 * never get completion IRQs ... maybe even the ones we need to
1266 * finish unlinking the initial failed usb_set_address()
1267 * or device descriptor fetch.
1268 */
8de98402
BH		 1269 if (!test_bit(HCD_FLAG_SAW_IRQ, &hcd->flags)
1270 && hcd->self.root_hub != urb->dev) {
1da177e4
LT		 1271 dev_warn (hcd->self.controller, "Unlink after no-IRQ? "
1272 "Controller is probably using the wrong IRQ."
1273 "\n");
8de98402 1274 set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
1da177e4
LT		 1275 }
1276
1277 urb->status = status;
1278
1279 spin_unlock (&hcd_data_lock);
1280 spin_unlock_irqrestore (&urb->lock, flags);
1281
1282 retval = unlink1 (hcd, urb);
1283 if (retval == 0)
1284 retval = -EINPROGRESS;
1285 return retval;
1286
1287done:
1288 spin_unlock (&hcd_data_lock);
1289 spin_unlock_irqrestore (&urb->lock, flags);
1290 if (retval != -EIDRM && sys && sys->driver)
1291 dev_dbg (sys, "hcd_unlink_urb %p fail %d\n", urb, retval);
1292 return retval;
1293}
1294
1295/*-------------------------------------------------------------------------*/
1296
1297/* disables the endpoint: cancels any pending urbs, then synchronizes with
455b25fb
AS		 1298 * the hcd to make sure all endpoint state is gone from hardware, and then
1299 * waits until the endpoint's queue is completely drained. use for
1da177e4
LT		 1300 * set_configuration, set_interface, driver removal, physical disconnect.
1301 *
1302 * example: a qh stored in ep->hcpriv, holding state related to endpoint
1303 * type, maxpacket size, toggle, halt status, and scheduling.
1304 */
a6d2bb9f
AS		 1305void usb_hcd_endpoint_disable (struct usb_device *udev,
1306 struct usb_host_endpoint *ep)
1da177e4
LT		 1307{
1308 struct usb_hcd *hcd;
1309 struct urb *urb;
1310
17200583 1311 hcd = bus_to_hcd(udev->bus);
1da177e4 1312
d5926ae7
AS		 1313 WARN_ON (!HC_IS_RUNNING (hcd->state) && hcd->state != HC_STATE_HALT &&
1314 udev->state != USB_STATE_NOTATTACHED);
1da177e4
LT		 1315
1316 local_irq_disable ();
1317
1da177e4
LT		 1318 /* ep is already gone from udev->ep_{in,out}[]; no more submits */
1319rescan:
1320 spin_lock (&hcd_data_lock);
1321 list_for_each_entry (urb, &ep->urb_list, urb_list) {
1322 int tmp;
1323
455b25fb 1324 /* the urb may already have been unlinked */
1da177e4
LT		 1325 if (urb->status != -EINPROGRESS)
1326 continue;
1327 usb_get_urb (urb);
1328 spin_unlock (&hcd_data_lock);
1329
1330 spin_lock (&urb->lock);
1331 tmp = urb->status;
1332 if (tmp == -EINPROGRESS)
1333 urb->status = -ESHUTDOWN;
1334 spin_unlock (&urb->lock);
1335
1336 /* kick hcd unless it's already returning this */
1337 if (tmp == -EINPROGRESS) {
1338 tmp = urb->pipe;
1339 unlink1 (hcd, urb);
1340 dev_dbg (hcd->self.controller,
1341 "shutdown urb %p pipe %08x ep%d%s%s\n",
1342 urb, tmp, usb_pipeendpoint (tmp),
1343 (tmp & USB_DIR_IN) ? "in" : "out",
1344 ({ char *s; \
1345 switch (usb_pipetype (tmp)) { \
1346 case PIPE_CONTROL: s = ""; break; \
1347 case PIPE_BULK: s = "-bulk"; break; \
1348 case PIPE_INTERRUPT: s = "-intr"; break; \
1349 default: s = "-iso"; break; \
1350 }; s;}));
1351 }
1352 usb_put_urb (urb);
1353
1354 /* list contents may have changed */
1355 goto rescan;
1356 }
1357 spin_unlock (&hcd_data_lock);
1358 local_irq_enable ();
1359
1360 /* synchronize with the hardware, so old configuration state
1361 * clears out immediately (and will be freed).
1362 */
1363 might_sleep ();
1364 if (hcd->driver->endpoint_disable)
1365 hcd->driver->endpoint_disable (hcd, ep);
455b25fb
AS		 1366
1367 /* Wait until the endpoint queue is completely empty. Most HCDs
1368 * will have done this already in their endpoint_disable method,
1369 * but some might not. And there could be root-hub control URBs
1370 * still pending since they aren't affected by the HCDs'
1371 * endpoint_disable methods.
1372 */
1373 while (!list_empty (&ep->urb_list)) {
1374 spin_lock_irq (&hcd_data_lock);
1375
1376 /* The list may have changed while we acquired the spinlock */
1377 urb = NULL;
1378 if (!list_empty (&ep->urb_list)) {
1379 urb = list_entry (ep->urb_list.prev, struct urb,
1380 urb_list);
1381 usb_get_urb (urb);
1382 }
1383 spin_unlock_irq (&hcd_data_lock);
1384
1385 if (urb) {
1386 usb_kill_urb (urb);
1387 usb_put_urb (urb);
1388 }
1389 }
1da177e4
LT		 1390}
1391
1392/*-------------------------------------------------------------------------*/
1393
9293677a 1394#ifdef CONFIG_PM
1da177e4 1395
0c0382e3 1396int hcd_bus_suspend (struct usb_bus *bus)
1da177e4
LT		 1397{
1398 struct usb_hcd *hcd;
9293677a 1399 int status;
1da177e4
LT		 1400
1401 hcd = container_of (bus, struct usb_hcd, self);
0c0382e3 1402 if (!hcd->driver->bus_suspend)
9293677a
DB		 1403 return -ENOENT;
1404 hcd->state = HC_STATE_QUIESCING;
0c0382e3 1405 status = hcd->driver->bus_suspend (hcd);
9293677a
DB		 1406 if (status == 0)
1407 hcd->state = HC_STATE_SUSPENDED;
1408 else
1409 dev_dbg(&bus->root_hub->dev, "%s fail, err %d\n",
1410 "suspend", status);
1411 return status;
1da177e4
LT		 1412}
1413
0c0382e3 1414int hcd_bus_resume (struct usb_bus *bus)
1da177e4
LT		 1415{
1416 struct usb_hcd *hcd;
9293677a 1417 int status;
1da177e4
LT		 1418
1419 hcd = container_of (bus, struct usb_hcd, self);
0c0382e3 1420 if (!hcd->driver->bus_resume)
9293677a 1421 return -ENOENT;
979d5199
DB		 1422 if (hcd->state == HC_STATE_RUNNING)
1423 return 0;
9293677a 1424 hcd->state = HC_STATE_RESUMING;
0c0382e3 1425 status = hcd->driver->bus_resume (hcd);
9293677a
DB		 1426 if (status == 0)
1427 hcd->state = HC_STATE_RUNNING;
1428 else {
1429 dev_dbg(&bus->root_hub->dev, "%s fail, err %d\n",
1430 "resume", status);
1431 usb_hc_died(hcd);
1432 }
1433 return status;
1da177e4
LT		 1434}
1435
1436/**
1437 * usb_hcd_resume_root_hub - called by HCD to resume its root hub
1438 * @hcd: host controller for this root hub
1439 *
1440 * The USB host controller calls this function when its root hub is
1441 * suspended (with the remote wakeup feature enabled) and a remote
1442 * wakeup request is received. It queues a request for khubd to
979d5199 1443 * resume the root hub (that is, manage its downstream ports again).
1da177e4
LT		 1444 */
1445void usb_hcd_resume_root_hub (struct usb_hcd *hcd)
1446{
1447 unsigned long flags;
1448
1449 spin_lock_irqsave (&hcd_root_hub_lock, flags);
1450 if (hcd->rh_registered)
1451 usb_resume_root_hub (hcd->self.root_hub);
1452 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
1453}
9293677a 1454EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub);
1da177e4 1455
1da177e4 1456#endif
1da177e4
LT		 1457
1458/*-------------------------------------------------------------------------*/
1459
1460#ifdef CONFIG_USB_OTG
1461
1462/**
1463 * usb_bus_start_enum - start immediate enumeration (for OTG)
1464 * @bus: the bus (must use hcd framework)
1465 * @port_num: 1-based number of port; usually bus->otg_port
1466 * Context: in_interrupt()
1467 *
1468 * Starts enumeration, with an immediate reset followed later by
1469 * khubd identifying and possibly configuring the device.
1470 * This is needed by OTG controller drivers, where it helps meet
1471 * HNP protocol timing requirements for starting a port reset.
1472 */
1473int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num)
1474{
1475 struct usb_hcd *hcd;
1476 int status = -EOPNOTSUPP;
1477
1478 /* NOTE: since HNP can't start by grabbing the bus's address0_sem,
1479 * boards with root hubs hooked up to internal devices (instead of
1480 * just the OTG port) may need more attention to resetting...
1481 */
1482 hcd = container_of (bus, struct usb_hcd, self);
1483 if (port_num && hcd->driver->start_port_reset)
1484 status = hcd->driver->start_port_reset(hcd, port_num);
1485
1486 /* run khubd shortly after (first) root port reset finishes;
1487 * it may issue others, until at least 50 msecs have passed.
1488 */
1489 if (status == 0)
1490 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10));
1491 return status;
1492}
1493EXPORT_SYMBOL (usb_bus_start_enum);
1494
1495#endif
1496
1497/*-------------------------------------------------------------------------*/
1498
1da177e4
LT		 1499/**
1500 * usb_hcd_giveback_urb - return URB from HCD to device driver
1501 * @hcd: host controller returning the URB
1502 * @urb: urb being returned to the USB device driver.
1da177e4
LT		 1503 * Context: in_interrupt()
1504 *
1505 * This hands the URB from HCD to its USB device driver, using its
1506 * completion function. The HCD has freed all per-urb resources
1507 * (and is done using urb->hcpriv). It also released all HCD locks;
1508 * the device driver won't cause problems if it frees, modifies,
1509 * or resubmits this URB.
1510 */
7d12e780 1511void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb)
1da177e4
LT		 1512{
1513 int at_root_hub;
1514
1515 at_root_hub = (urb->dev == hcd->self.root_hub);
1516 urb_unlink (urb);
1517
dd990f16
AS		 1518 /* lower level hcd code should use *_dma exclusively if the
1519 * host controller does DMA */
1520 if (hcd->self.uses_dma && !at_root_hub) {
1da177e4
LT		 1521 if (usb_pipecontrol (urb->pipe)
1522 && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
1523 dma_unmap_single (hcd->self.controller, urb->setup_dma,
1524 sizeof (struct usb_ctrlrequest),
1525 DMA_TO_DEVICE);
1526 if (urb->transfer_buffer_length != 0
1527 && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP))
1528 dma_unmap_single (hcd->self.controller,
1529 urb->transfer_dma,
1530 urb->transfer_buffer_length,
1531 usb_pipein (urb->pipe)
1532 ? DMA_FROM_DEVICE
1533 : DMA_TO_DEVICE);
1534 }
1535
1536 usbmon_urb_complete (&hcd->self, urb);
1537 /* pass ownership to the completion handler */
7d12e780 1538 urb->complete (urb);
1da177e4
LT		 1539 atomic_dec (&urb->use_count);
1540 if (unlikely (urb->reject))
1541 wake_up (&usb_kill_urb_queue);
1542 usb_put_urb (urb);
1543}
1544EXPORT_SYMBOL (usb_hcd_giveback_urb);
1545
1546/*-------------------------------------------------------------------------*/
1547
1548/**
1549 * usb_hcd_irq - hook IRQs to HCD framework (bus glue)
1550 * @irq: the IRQ being raised
1551 * @__hcd: pointer to the HCD whose IRQ is being signaled
1552 * @r: saved hardware registers
1553 *
1554 * If the controller isn't HALTed, calls the driver's irq handler.
1555 * Checks whether the controller is now dead.
1556 */
7d12e780 1557irqreturn_t usb_hcd_irq (int irq, void *__hcd)
1da177e4
LT		 1558{
1559 struct usb_hcd *hcd = __hcd;
1560 int start = hcd->state;
1561
8de98402
BH		 1562 if (unlikely(start == HC_STATE_HALT ||
1563 !test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
1da177e4 1564 return IRQ_NONE;
7d12e780 1565 if (hcd->driver->irq (hcd) == IRQ_NONE)
1da177e4
LT		 1566 return IRQ_NONE;
1567
8de98402
BH		 1568 set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
1569
1570 if (unlikely(hcd->state == HC_STATE_HALT))
1da177e4
LT		 1571 usb_hc_died (hcd);
1572 return IRQ_HANDLED;
1573}
1574
1575/*-------------------------------------------------------------------------*/
1576
1577/**
1578 * usb_hc_died - report abnormal shutdown of a host controller (bus glue)
1579 * @hcd: pointer to the HCD representing the controller
1580 *
1581 * This is called by bus glue to report a USB host controller that died
1582 * while operations may still have been pending. It's called automatically
1583 * by the PCI glue, so only glue for non-PCI busses should need to call it.
1584 */
1585void usb_hc_died (struct usb_hcd *hcd)
1586{
1587 unsigned long flags;
1588
1589 dev_err (hcd->self.controller, "HC died; cleaning up\n");
1590
1591 spin_lock_irqsave (&hcd_root_hub_lock, flags);
1592 if (hcd->rh_registered) {
d5926ae7 1593 hcd->poll_rh = 0;
1da177e4
LT		 1594
1595 /* make khubd clean up old urbs and devices */
1596 usb_set_device_state (hcd->self.root_hub,
1597 USB_STATE_NOTATTACHED);
1598 usb_kick_khubd (hcd->self.root_hub);
1599 }
1600 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
1601}
1602EXPORT_SYMBOL_GPL (usb_hc_died);
1603
1604/*-------------------------------------------------------------------------*/
1605
1da177e4
LT		 1606/**
1607 * usb_create_hcd - create and initialize an HCD structure
1608 * @driver: HC driver that will use this hcd
1609 * @dev: device for this HC, stored in hcd->self.controller
1610 * @bus_name: value to store in hcd->self.bus_name
1611 * Context: !in_interrupt()
1612 *
1613 * Allocate a struct usb_hcd, with extra space at the end for the
1614 * HC driver's private data. Initialize the generic members of the
1615 * hcd structure.
1616 *
1617 * If memory is unavailable, returns NULL.
1618 */
1619struct usb_hcd *usb_create_hcd (const struct hc_driver *driver,
1620 struct device *dev, char *bus_name)
1621{
1622 struct usb_hcd *hcd;
1623
7b842b6e 1624 hcd = kzalloc(sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL);
1da177e4
LT		 1625 if (!hcd) {
1626 dev_dbg (dev, "hcd alloc failed\n");
1627 return NULL;
1628 }
1629 dev_set_drvdata(dev, hcd);
17200583 1630 kref_init(&hcd->kref);
1da177e4
LT		 1631
1632 usb_bus_init(&hcd->self);
1da177e4
LT		 1633 hcd->self.controller = dev;
1634 hcd->self.bus_name = bus_name;
dd990f16 1635 hcd->self.uses_dma = (dev->dma_mask != NULL);
1da177e4
LT		 1636
1637 init_timer(&hcd->rh_timer);
d5926ae7
AS		 1638 hcd->rh_timer.function = rh_timer_func;
1639 hcd->rh_timer.data = (unsigned long) hcd;
1da177e4
LT		 1640
1641 hcd->driver = driver;
1642 hcd->product_desc = (driver->product_desc) ? driver->product_desc :
1643 "USB Host Controller";
1644
1645 return hcd;
1646}
1647EXPORT_SYMBOL (usb_create_hcd);
1648
17200583
AS		 1649static void hcd_release (struct kref *kref)
1650{
1651 struct usb_hcd *hcd = container_of (kref, struct usb_hcd, kref);
1652
1653 kfree(hcd);
1654}
1655
1656struct usb_hcd *usb_get_hcd (struct usb_hcd *hcd)
1657{
1658 if (hcd)
1659 kref_get (&hcd->kref);
1660 return hcd;
1661}
1662EXPORT_SYMBOL (usb_get_hcd);
1663
1da177e4
LT		 1664void usb_put_hcd (struct usb_hcd *hcd)
1665{
17200583
AS		 1666 if (hcd)
1667 kref_put (&hcd->kref, hcd_release);
1da177e4
LT		 1668}
1669EXPORT_SYMBOL (usb_put_hcd);
1670
1671/**
1672 * usb_add_hcd - finish generic HCD structure initialization and register
1673 * @hcd: the usb_hcd structure to initialize
1674 * @irqnum: Interrupt line to allocate
1675 * @irqflags: Interrupt type flags
1676 *
1677 * Finish the remaining parts of generic HCD initialization: allocate the
1678 * buffers of consistent memory, register the bus, request the IRQ line,
1679 * and call the driver's reset() and start() routines.
1680 */
1681int usb_add_hcd(struct usb_hcd *hcd,
1682 unsigned int irqnum, unsigned long irqflags)
1683{
8ec8d20b
AS		 1684 int retval;
1685 struct usb_device *rhdev;
1da177e4
LT		 1686
1687 dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
1688
8de98402
BH		 1689 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1690
b1e8f0a6
DB		 1691 /* HC is in reset state, but accessible. Now do the one-time init,
1692 * bottom up so that hcds can customize the root hubs before khubd
1693 * starts talking to them. (Note, bus id is assigned early too.)
1694 */
1da177e4
LT		 1695 if ((retval = hcd_buffer_create(hcd)) != 0) {
1696 dev_dbg(hcd->self.controller, "pool alloc failed\n");
1697 return retval;
1698 }
1699
1700 if ((retval = usb_register_bus(&hcd->self)) < 0)
8ec8d20b 1701 goto err_register_bus;
1da177e4 1702
b1e8f0a6
DB		 1703 if ((rhdev = usb_alloc_dev(NULL, &hcd->self, 0)) == NULL) {
1704 dev_err(hcd->self.controller, "unable to allocate root hub\n");
1705 retval = -ENOMEM;
1706 goto err_allocate_root_hub;
1707 }
1708 rhdev->speed = (hcd->driver->flags & HCD_USB2) ? USB_SPEED_HIGH :
1709 USB_SPEED_FULL;
1710 hcd->self.root_hub = rhdev;
1711
db4cefaa
DB		 1712 /* wakeup flag init defaults to "everything works" for root hubs,
1713 * but drivers can override it in reset() if needed, along with
1714 * recording the overall controller's system wakeup capability.
1715 */
1716 device_init_wakeup(&rhdev->dev, 1);
1717
b1e8f0a6
DB		 1718 /* "reset" is misnamed; its role is now one-time init. the controller
1719 * should already have been reset (and boot firmware kicked off etc).
1720 */
1721 if (hcd->driver->reset && (retval = hcd->driver->reset(hcd)) < 0) {
1722 dev_err(hcd->self.controller, "can't setup\n");
1723 goto err_hcd_driver_setup;
1724 }
1725
fb669cc0
DB		 1726 /* NOTE: root hub and controller capabilities may not be the same */
1727 if (device_can_wakeup(hcd->self.controller)
1728 && device_can_wakeup(&hcd->self.root_hub->dev))
b1e8f0a6 1729 dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
b1e8f0a6
DB		 1730
1731 /* enable irqs just before we start the controller */
1da177e4 1732 if (hcd->driver->irq) {
1da177e4
LT		 1733 snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d",
1734 hcd->driver->description, hcd->self.busnum);
1735 if ((retval = request_irq(irqnum, &usb_hcd_irq, irqflags,
1736 hcd->irq_descr, hcd)) != 0) {
1737 dev_err(hcd->self.controller,
c6387a48 1738 "request interrupt %d failed\n", irqnum);
8ec8d20b 1739 goto err_request_irq;
1da177e4
LT		 1740 }
1741 hcd->irq = irqnum;
c6387a48 1742 dev_info(hcd->self.controller, "irq %d, %s 0x%08llx\n", irqnum,
1da177e4
LT		 1743 (hcd->driver->flags & HCD_MEMORY) ?
1744 "io mem" : "io base",
1745 (unsigned long long)hcd->rsrc_start);
1746 } else {
1747 hcd->irq = -1;
1748 if (hcd->rsrc_start)
1749 dev_info(hcd->self.controller, "%s 0x%08llx\n",
1750 (hcd->driver->flags & HCD_MEMORY) ?
1751 "io mem" : "io base",
1752 (unsigned long long)hcd->rsrc_start);
1753 }
1754
1755 if ((retval = hcd->driver->start(hcd)) < 0) {
1756 dev_err(hcd->self.controller, "startup error %d\n", retval);
8ec8d20b 1757 goto err_hcd_driver_start;
1da177e4
LT		 1758 }
1759
b1e8f0a6 1760 /* starting here, usbcore will pay attention to this root hub */
55c52718 1761 rhdev->bus_mA = min(500u, hcd->power_budget);
b1e8f0a6 1762 if ((retval = register_root_hub(hcd)) != 0)
8ec8d20b
AS		 1763 goto err_register_root_hub;
1764
d5926ae7
AS		 1765 if (hcd->uses_new_polling && hcd->poll_rh)
1766 usb_hcd_poll_rh_status(hcd);
1da177e4
LT		 1767 return retval;
1768
b1e8f0a6 1769err_register_root_hub:
8ec8d20b 1770 hcd->driver->stop(hcd);
b1e8f0a6 1771err_hcd_driver_start:
1da177e4
LT		 1772 if (hcd->irq >= 0)
1773 free_irq(irqnum, hcd);
b1e8f0a6
DB		 1774err_request_irq:
1775err_hcd_driver_setup:
1776 hcd->self.root_hub = NULL;
1777 usb_put_dev(rhdev);
1778err_allocate_root_hub:
1da177e4 1779 usb_deregister_bus(&hcd->self);
b1e8f0a6 1780err_register_bus:
1da177e4
LT		 1781 hcd_buffer_destroy(hcd);
1782 return retval;
1783}
1784EXPORT_SYMBOL (usb_add_hcd);
1785
1786/**
1787 * usb_remove_hcd - shutdown processing for generic HCDs
1788 * @hcd: the usb_hcd structure to remove
1789 * Context: !in_interrupt()
1790 *
1791 * Disconnects the root hub, then reverses the effects of usb_add_hcd(),
1792 * invoking the HCD's stop() method.
1793 */
1794void usb_remove_hcd(struct usb_hcd *hcd)
1795{
1796 dev_info(hcd->self.controller, "remove, state %x\n", hcd->state);
1797
1798 if (HC_IS_RUNNING (hcd->state))
1799 hcd->state = HC_STATE_QUIESCING;
1800
1801 dev_dbg(hcd->self.controller, "roothub graceful disconnect\n");
1802 spin_lock_irq (&hcd_root_hub_lock);
1803 hcd->rh_registered = 0;
1804 spin_unlock_irq (&hcd_root_hub_lock);
9ad3d6cc 1805
4186ecf8 1806 mutex_lock(&usb_bus_list_lock);
1da177e4 1807 usb_disconnect(&hcd->self.root_hub);
4186ecf8 1808 mutex_unlock(&usb_bus_list_lock);
1da177e4 1809
d5926ae7
AS		 1810 hcd->poll_rh = 0;
1811 del_timer_sync(&hcd->rh_timer);
1812
1da177e4
LT		 1813 hcd->driver->stop(hcd);
1814 hcd->state = HC_STATE_HALT;
1815
1816 if (hcd->irq >= 0)
1817 free_irq(hcd->irq, hcd);
1818 usb_deregister_bus(&hcd->self);
1819 hcd_buffer_destroy(hcd);
1820}
1821EXPORT_SYMBOL (usb_remove_hcd);
1822
64a21d02
AG		 1823void
1824usb_hcd_platform_shutdown(struct platform_device* dev)
1825{
1826 struct usb_hcd *hcd = platform_get_drvdata(dev);
1827
1828 if (hcd->driver->shutdown)
1829 hcd->driver->shutdown(hcd);
1830}
1831EXPORT_SYMBOL (usb_hcd_platform_shutdown);
1832
1da177e4
LT		 1833/*-------------------------------------------------------------------------*/
1834
4749f32d 1835#if defined(CONFIG_USB_MON)
1da177e4
LT		 1836
1837struct usb_mon_operations *mon_ops;
1838
1839/*
1840 * The registration is unlocked.
1841 * We do it this way because we do not want to lock in hot paths.
1842 *
1843 * Notice that the code is minimally error-proof. Because usbmon needs
1844 * symbols from usbcore, usbcore gets referenced and cannot be unloaded first.
1845 */
1846
1847int usb_mon_register (struct usb_mon_operations *ops)
1848{
1849
1850 if (mon_ops)
1851 return -EBUSY;
1852
1853 mon_ops = ops;
1854 mb();
1855 return 0;
1856}
1857EXPORT_SYMBOL_GPL (usb_mon_register);
1858
1859void usb_mon_deregister (void)
1860{
1861
1862 if (mon_ops == NULL) {
1863 printk(KERN_ERR "USB: monitor was not registered\n");
1864 return;
1865 }
1866 mon_ops = NULL;
1867 mb();
1868}
1869EXPORT_SYMBOL_GPL (usb_mon_deregister);
1870
1871#endif /* CONFIG_USB_MON */
Linux kernel - Deliverables
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