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[PATCH] Additional device ID for Conexant AccessRunner USB driver
[GitHub/mt8127/android_kernel_alcatel_ttab.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
25#include <linux/config.h>
1da177e4
LT		 26#include <linux/module.h>
27#include <linux/version.h>
28#include <linux/kernel.h>
29#include <linux/slab.h>
30#include <linux/completion.h>
31#include <linux/utsname.h>
32#include <linux/mm.h>
33#include <asm/io.h>
34#include <asm/scatterlist.h>
35#include <linux/device.h>
36#include <linux/dma-mapping.h>
37#include <asm/irq.h>
38#include <asm/byteorder.h>
39
40#include <linux/usb.h>
41
42#include "usb.h"
43#include "hcd.h"
44#include "hub.h"
45
46
47// #define USB_BANDWIDTH_MESSAGES
48
49/*-------------------------------------------------------------------------*/
50
51/*
52 * USB Host Controller Driver framework
53 *
54 * Plugs into usbcore (usb_bus) and lets HCDs share code, minimizing
55 * HCD-specific behaviors/bugs.
56 *
57 * This does error checks, tracks devices and urbs, and delegates to a
58 * "hc_driver" only for code (and data) that really needs to know about
59 * hardware differences. That includes root hub registers, i/o queues,
60 * and so on ... but as little else as possible.
61 *
62 * Shared code includes most of the "root hub" code (these are emulated,
63 * though each HC's hardware works differently) and PCI glue, plus request
64 * tracking overhead. The HCD code should only block on spinlocks or on
65 * hardware handshaking; blocking on software events (such as other kernel
66 * threads releasing resources, or completing actions) is all generic.
67 *
68 * Happens the USB 2.0 spec says this would be invisible inside the "USBD",
69 * and includes mostly a "HCDI" (HCD Interface) along with some APIs used
70 * only by the hub driver ... and that neither should be seen or used by
71 * usb client device drivers.
72 *
73 * Contributors of ideas or unattributed patches include: David Brownell,
74 * Roman Weissgaerber, Rory Bolt, Greg Kroah-Hartman, ...
75 *
76 * HISTORY:
77 * 2002-02-21 Pull in most of the usb_bus support from usb.c; some
78 * associated cleanup. "usb_hcd" still != "usb_bus".
79 * 2001-12-12 Initial patch version for Linux 2.5.1 kernel.
80 */
81
82/*-------------------------------------------------------------------------*/
83
84/* host controllers we manage */
85LIST_HEAD (usb_bus_list);
86EXPORT_SYMBOL_GPL (usb_bus_list);
87
88/* used when allocating bus numbers */
89#define USB_MAXBUS 64
90struct usb_busmap {
91 unsigned long busmap [USB_MAXBUS / (8*sizeof (unsigned long))];
92};
93static struct usb_busmap busmap;
94
95/* used when updating list of hcds */
96DECLARE_MUTEX (usb_bus_list_lock); /* exported only for usbfs */
97EXPORT_SYMBOL_GPL (usb_bus_list_lock);
98
99/* used for controlling access to virtual root hubs */
100static DEFINE_SPINLOCK(hcd_root_hub_lock);
101
102/* used when updating hcd data */
103static DEFINE_SPINLOCK(hcd_data_lock);
104
105/* wait queue for synchronous unlinks */
106DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue);
107
108/*-------------------------------------------------------------------------*/
109
110/*
111 * Sharable chunks of root hub code.
112 */
113
114/*-------------------------------------------------------------------------*/
115
116#define KERNEL_REL ((LINUX_VERSION_CODE >> 16) & 0x0ff)
117#define KERNEL_VER ((LINUX_VERSION_CODE >> 8) & 0x0ff)
118
119/* usb 2.0 root hub device descriptor */
120static const u8 usb2_rh_dev_descriptor [18] = {
121 0x12, /* __u8 bLength; */
122 0x01, /* __u8 bDescriptorType; Device */
123 0x00, 0x02, /* __le16 bcdUSB; v2.0 */
124
125 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
126 0x00, /* __u8 bDeviceSubClass; */
127 0x01, /* __u8 bDeviceProtocol; [ usb 2.0 single TT ]*/
16f16d11 128 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
1da177e4
LT		 129
130 0x00, 0x00, /* __le16 idVendor; */
131 0x00, 0x00, /* __le16 idProduct; */
132 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
133
134 0x03, /* __u8 iManufacturer; */
135 0x02, /* __u8 iProduct; */
136 0x01, /* __u8 iSerialNumber; */
137 0x01 /* __u8 bNumConfigurations; */
138};
139
140/* no usb 2.0 root hub "device qualifier" descriptor: one speed only */
141
142/* usb 1.1 root hub device descriptor */
143static const u8 usb11_rh_dev_descriptor [18] = {
144 0x12, /* __u8 bLength; */
145 0x01, /* __u8 bDescriptorType; Device */
146 0x10, 0x01, /* __le16 bcdUSB; v1.1 */
147
148 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
149 0x00, /* __u8 bDeviceSubClass; */
150 0x00, /* __u8 bDeviceProtocol; [ low/full speeds only ] */
16f16d11 151 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
1da177e4
LT		 152
153 0x00, 0x00, /* __le16 idVendor; */
154 0x00, 0x00, /* __le16 idProduct; */
155 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
156
157 0x03, /* __u8 iManufacturer; */
158 0x02, /* __u8 iProduct; */
159 0x01, /* __u8 iSerialNumber; */
160 0x01 /* __u8 bNumConfigurations; */
161};
162
163
164/*-------------------------------------------------------------------------*/
165
166/* Configuration descriptors for our root hubs */
167
168static const u8 fs_rh_config_descriptor [] = {
169
170 /* one configuration */
171 0x09, /* __u8 bLength; */
172 0x02, /* __u8 bDescriptorType; Configuration */
173 0x19, 0x00, /* __le16 wTotalLength; */
174 0x01, /* __u8 bNumInterfaces; (1) */
175 0x01, /* __u8 bConfigurationValue; */
176 0x00, /* __u8 iConfiguration; */
177 0xc0, /* __u8 bmAttributes;
178 Bit 7: must be set,
179 6: Self-powered,
180 5: Remote wakeup,
181 4..0: resvd */
182 0x00, /* __u8 MaxPower; */
183
184 /* USB 1.1:
185 * USB 2.0, single TT organization (mandatory):
186 * one interface, protocol 0
187 *
188 * USB 2.0, multiple TT organization (optional):
189 * two interfaces, protocols 1 (like single TT)
190 * and 2 (multiple TT mode) ... config is
191 * sometimes settable
192 * NOT IMPLEMENTED
193 */
194
195 /* one interface */
196 0x09, /* __u8 if_bLength; */
197 0x04, /* __u8 if_bDescriptorType; Interface */
198 0x00, /* __u8 if_bInterfaceNumber; */
199 0x00, /* __u8 if_bAlternateSetting; */
200 0x01, /* __u8 if_bNumEndpoints; */
201 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
202 0x00, /* __u8 if_bInterfaceSubClass; */
203 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
204 0x00, /* __u8 if_iInterface; */
205
206 /* one endpoint (status change endpoint) */
207 0x07, /* __u8 ep_bLength; */
208 0x05, /* __u8 ep_bDescriptorType; Endpoint */
209 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
210 0x03, /* __u8 ep_bmAttributes; Interrupt */
211 0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */
212 0xff /* __u8 ep_bInterval; (255ms -- usb 2.0 spec) */
213};
214
215static const u8 hs_rh_config_descriptor [] = {
216
217 /* one configuration */
218 0x09, /* __u8 bLength; */
219 0x02, /* __u8 bDescriptorType; Configuration */
220 0x19, 0x00, /* __le16 wTotalLength; */
221 0x01, /* __u8 bNumInterfaces; (1) */
222 0x01, /* __u8 bConfigurationValue; */
223 0x00, /* __u8 iConfiguration; */
224 0xc0, /* __u8 bmAttributes;
225 Bit 7: must be set,
226 6: Self-powered,
227 5: Remote wakeup,
228 4..0: resvd */
229 0x00, /* __u8 MaxPower; */
230
231 /* USB 1.1:
232 * USB 2.0, single TT organization (mandatory):
233 * one interface, protocol 0
234 *
235 * USB 2.0, multiple TT organization (optional):
236 * two interfaces, protocols 1 (like single TT)
237 * and 2 (multiple TT mode) ... config is
238 * sometimes settable
239 * NOT IMPLEMENTED
240 */
241
242 /* one interface */
243 0x09, /* __u8 if_bLength; */
244 0x04, /* __u8 if_bDescriptorType; Interface */
245 0x00, /* __u8 if_bInterfaceNumber; */
246 0x00, /* __u8 if_bAlternateSetting; */
247 0x01, /* __u8 if_bNumEndpoints; */
248 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
249 0x00, /* __u8 if_bInterfaceSubClass; */
250 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
251 0x00, /* __u8 if_iInterface; */
252
253 /* one endpoint (status change endpoint) */
254 0x07, /* __u8 ep_bLength; */
255 0x05, /* __u8 ep_bDescriptorType; Endpoint */
256 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
257 0x03, /* __u8 ep_bmAttributes; Interrupt */
258 0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */
259 0x0c /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
260};
261
262/*-------------------------------------------------------------------------*/
263
264/*
265 * helper routine for returning string descriptors in UTF-16LE
266 * input can actually be ISO-8859-1; ASCII is its 7-bit subset
267 */
268static int ascii2utf (char *s, u8 *utf, int utfmax)
269{
270 int retval;
271
272 for (retval = 0; *s && utfmax > 1; utfmax -= 2, retval += 2) {
273 *utf++ = *s++;
274 *utf++ = 0;
275 }
276 if (utfmax > 0) {
277 *utf = *s;
278 ++retval;
279 }
280 return retval;
281}
282
283/*
284 * rh_string - provides manufacturer, product and serial strings for root hub
285 * @id: the string ID number (1: serial number, 2: product, 3: vendor)
286 * @hcd: the host controller for this root hub
287 * @type: string describing our driver
288 * @data: return packet in UTF-16 LE
289 * @len: length of the return packet
290 *
291 * Produces either a manufacturer, product or serial number string for the
292 * virtual root hub device.
293 */
294static int rh_string (
295 int id,
296 struct usb_hcd *hcd,
297 u8 *data,
298 int len
299) {
300 char buf [100];
301
302 // language ids
303 if (id == 0) {
304 buf[0] = 4; buf[1] = 3; /* 4 bytes string data */
305 buf[2] = 0x09; buf[3] = 0x04; /* MSFT-speak for "en-us" */
306 len = min (len, 4);
307 memcpy (data, buf, len);
308 return len;
309
310 // serial number
311 } else if (id == 1) {
312 strlcpy (buf, hcd->self.bus_name, sizeof buf);
313
314 // product description
315 } else if (id == 2) {
316 strlcpy (buf, hcd->product_desc, sizeof buf);
317
318 // id 3 == vendor description
319 } else if (id == 3) {
320 snprintf (buf, sizeof buf, "%s %s %s", system_utsname.sysname,
321 system_utsname.release, hcd->driver->description);
322
323 // unsupported IDs --> "protocol stall"
324 } else
325 return -EPIPE;
326
327 switch (len) { /* All cases fall through */
328 default:
329 len = 2 + ascii2utf (buf, data + 2, len - 2);
330 case 2:
331 data [1] = 3; /* type == string */
332 case 1:
333 data [0] = 2 * (strlen (buf) + 1);
334 case 0:
335 ; /* Compiler wants a statement here */
336 }
337 return len;
338}
339
340
341/* Root hub control transfers execute synchronously */
342static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
343{
344 struct usb_ctrlrequest *cmd;
345 u16 typeReq, wValue, wIndex, wLength;
346 u8 *ubuf = urb->transfer_buffer;
347 u8 tbuf [sizeof (struct usb_hub_descriptor)];
348 const u8 *bufp = tbuf;
349 int len = 0;
350 int patch_wakeup = 0;
351 unsigned long flags;
352 int status = 0;
353 int n;
354
355 cmd = (struct usb_ctrlrequest *) urb->setup_packet;
356 typeReq = (cmd->bRequestType << 8) | cmd->bRequest;
357 wValue = le16_to_cpu (cmd->wValue);
358 wIndex = le16_to_cpu (cmd->wIndex);
359 wLength = le16_to_cpu (cmd->wLength);
360
361 if (wLength > urb->transfer_buffer_length)
362 goto error;
363
364 urb->actual_length = 0;
365 switch (typeReq) {
366
367 /* DEVICE REQUESTS */
368
369 case DeviceRequest | USB_REQ_GET_STATUS:
370 tbuf [0] = (hcd->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP)
371 | (1 << USB_DEVICE_SELF_POWERED);
372 tbuf [1] = 0;
373 len = 2;
374 break;
375 case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
376 if (wValue == USB_DEVICE_REMOTE_WAKEUP)
377 hcd->remote_wakeup = 0;
378 else
379 goto error;
380 break;
381 case DeviceOutRequest | USB_REQ_SET_FEATURE:
382 if (hcd->can_wakeup && wValue == USB_DEVICE_REMOTE_WAKEUP)
383 hcd->remote_wakeup = 1;
384 else
385 goto error;
386 break;
387 case DeviceRequest | USB_REQ_GET_CONFIGURATION:
388 tbuf [0] = 1;
389 len = 1;
390 /* FALLTHROUGH */
391 case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
392 break;
393 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
394 switch (wValue & 0xff00) {
395 case USB_DT_DEVICE << 8:
396 if (hcd->driver->flags & HCD_USB2)
397 bufp = usb2_rh_dev_descriptor;
398 else if (hcd->driver->flags & HCD_USB11)
399 bufp = usb11_rh_dev_descriptor;
400 else
401 goto error;
402 len = 18;
403 break;
404 case USB_DT_CONFIG << 8:
405 if (hcd->driver->flags & HCD_USB2) {
406 bufp = hs_rh_config_descriptor;
407 len = sizeof hs_rh_config_descriptor;
408 } else {
409 bufp = fs_rh_config_descriptor;
410 len = sizeof fs_rh_config_descriptor;
411 }
412 if (hcd->can_wakeup)
413 patch_wakeup = 1;
414 break;
415 case USB_DT_STRING << 8:
416 n = rh_string (wValue & 0xff, hcd, ubuf, wLength);
417 if (n < 0)
418 goto error;
419 urb->actual_length = n;
420 break;
421 default:
422 goto error;
423 }
424 break;
425 case DeviceRequest | USB_REQ_GET_INTERFACE:
426 tbuf [0] = 0;
427 len = 1;
428 /* FALLTHROUGH */
429 case DeviceOutRequest | USB_REQ_SET_INTERFACE:
430 break;
431 case DeviceOutRequest | USB_REQ_SET_ADDRESS:
432 // wValue == urb->dev->devaddr
433 dev_dbg (hcd->self.controller, "root hub device address %d\n",
434 wValue);
435 break;
436
437 /* INTERFACE REQUESTS (no defined feature/status flags) */
438
439 /* ENDPOINT REQUESTS */
440
441 case EndpointRequest | USB_REQ_GET_STATUS:
442 // ENDPOINT_HALT flag
443 tbuf [0] = 0;
444 tbuf [1] = 0;
445 len = 2;
446 /* FALLTHROUGH */
447 case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
448 case EndpointOutRequest | USB_REQ_SET_FEATURE:
449 dev_dbg (hcd->self.controller, "no endpoint features yet\n");
450 break;
451
452 /* CLASS REQUESTS (and errors) */
453
454 default:
455 /* non-generic request */
b13296c6
DB		 456 switch (typeReq) {
457 case GetHubStatus:
458 case GetPortStatus:
459 len = 4;
460 break;
461 case GetHubDescriptor:
462 len = sizeof (struct usb_hub_descriptor);
463 break;
1da177e4 464 }
b13296c6
DB		 465 status = hcd->driver->hub_control (hcd,
466 typeReq, wValue, wIndex,
467 tbuf, wLength);
1da177e4
LT		 468 break;
469error:
470 /* "protocol stall" on error */
471 status = -EPIPE;
472 }
473
474 if (status) {
475 len = 0;
476 if (status != -EPIPE) {
477 dev_dbg (hcd->self.controller,
478 "CTRL: TypeReq=0x%x val=0x%x "
479 "idx=0x%x len=%d ==> %d\n",
480 typeReq, wValue, wIndex,
b13296c6 481 wLength, status);
1da177e4
LT		 482 }
483 }
484 if (len) {
485 if (urb->transfer_buffer_length < len)
486 len = urb->transfer_buffer_length;
487 urb->actual_length = len;
488 // always USB_DIR_IN, toward host
489 memcpy (ubuf, bufp, len);
490
491 /* report whether RH hardware supports remote wakeup */
492 if (patch_wakeup &&
493 len > offsetof (struct usb_config_descriptor,
494 bmAttributes))
495 ((struct usb_config_descriptor *)ubuf)->bmAttributes
496 |= USB_CONFIG_ATT_WAKEUP;
497 }
498
499 /* any errors get returned through the urb completion */
500 local_irq_save (flags);
501 spin_lock (&urb->lock);
502 if (urb->status == -EINPROGRESS)
503 urb->status = status;
504 spin_unlock (&urb->lock);
505 usb_hcd_giveback_urb (hcd, urb, NULL);
506 local_irq_restore (flags);
507 return 0;
508}
509
510/*-------------------------------------------------------------------------*/
511
512/*
d5926ae7
AS		 513 * Root Hub interrupt transfers are polled using a timer if the
514 * driver requests it; otherwise the driver is responsible for
515 * calling usb_hcd_poll_rh_status() when an event occurs.
1da177e4 516 *
d5926ae7
AS		 517 * Completions are called in_interrupt(), but they may or may not
518 * be in_irq().
1da177e4 519 */
d5926ae7
AS		 520void usb_hcd_poll_rh_status(struct usb_hcd *hcd)
521{
522 struct urb *urb;
523 int length;
524 unsigned long flags;
525 char buffer[4]; /* Any root hubs with > 31 ports? */
1da177e4 526
d5926ae7
AS		 527 if (!hcd->uses_new_polling && !hcd->status_urb)
528 return;
1da177e4 529
d5926ae7
AS		 530 length = hcd->driver->hub_status_data(hcd, buffer);
531 if (length > 0) {
1da177e4 532
d5926ae7
AS		 533 /* try to complete the status urb */
534 local_irq_save (flags);
535 spin_lock(&hcd_root_hub_lock);
536 urb = hcd->status_urb;
537 if (urb) {
538 spin_lock(&urb->lock);
539 if (urb->status == -EINPROGRESS) {
540 hcd->poll_pending = 0;
541 hcd->status_urb = NULL;
542 urb->status = 0;
543 urb->hcpriv = NULL;
544 urb->actual_length = length;
545 memcpy(urb->transfer_buffer, buffer, length);
546 } else /* urb has been unlinked */
547 length = 0;
548 spin_unlock(&urb->lock);
549 } else
550 length = 0;
551 spin_unlock(&hcd_root_hub_lock);
552
553 /* local irqs are always blocked in completions */
554 if (length > 0)
555 usb_hcd_giveback_urb (hcd, urb, NULL);
556 else
557 hcd->poll_pending = 1;
558 local_irq_restore (flags);
1da177e4
LT		 559 }
560
d5926ae7
AS		 561 /* The USB 2.0 spec says 256 ms. This is close enough and won't
562 * exceed that limit if HZ is 100. */
563 if (hcd->uses_new_polling ? hcd->poll_rh :
564 (length == 0 && hcd->status_urb != NULL))
565 mod_timer (&hcd->rh_timer, jiffies + msecs_to_jiffies(250));
1da177e4 566}
d5926ae7 567EXPORT_SYMBOL_GPL(usb_hcd_poll_rh_status);
1da177e4
LT		 568
569/* timer callback */
d5926ae7
AS		 570static void rh_timer_func (unsigned long _hcd)
571{
572 usb_hcd_poll_rh_status((struct usb_hcd *) _hcd);
573}
574
575/*-------------------------------------------------------------------------*/
1da177e4 576
d5926ae7 577static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb)
1da177e4 578{
d5926ae7 579 int retval;
1da177e4 580 unsigned long flags;
d5926ae7 581 int len = 1 + (urb->dev->maxchild / 8);
1da177e4 582
d5926ae7
AS		 583 spin_lock_irqsave (&hcd_root_hub_lock, flags);
584 if (urb->status != -EINPROGRESS) /* already unlinked */
585 retval = urb->status;
586 else if (hcd->status_urb || urb->transfer_buffer_length < len) {
587 dev_dbg (hcd->self.controller, "not queuing rh status urb\n");
588 retval = -EINVAL;
589 } else {
590 hcd->status_urb = urb;
591 urb->hcpriv = hcd; /* indicate it's queued */
1da177e4 592
d5926ae7
AS		 593 if (!hcd->uses_new_polling)
594 mod_timer (&hcd->rh_timer, jiffies +
595 msecs_to_jiffies(250));
1da177e4 596
d5926ae7
AS		 597 /* If a status change has already occurred, report it ASAP */
598 else if (hcd->poll_pending)
599 mod_timer (&hcd->rh_timer, jiffies);
600 retval = 0;
1da177e4 601 }
d5926ae7
AS		 602 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
603 return retval;
1da177e4
LT		 604}
605
1da177e4
LT		 606static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb)
607{
d5926ae7
AS		 608 if (usb_pipeint (urb->pipe))
609 return rh_queue_status (hcd, urb);
1da177e4
LT		 610 if (usb_pipecontrol (urb->pipe))
611 return rh_call_control (hcd, urb);
d5926ae7 612 return -EINVAL;
1da177e4
LT		 613}
614
615/*-------------------------------------------------------------------------*/
616
d5926ae7
AS		 617/* Asynchronous unlinks of root-hub control URBs are legal, but they
618 * don't do anything. Status URB unlinks must be made in process context
619 * with interrupts enabled.
620 */
1da177e4
LT		 621static int usb_rh_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
622{
d5926ae7
AS		 623 if (usb_pipeendpoint(urb->pipe) == 0) { /* Control URB */
624 if (in_interrupt())
625 return 0; /* nothing to do */
1da177e4 626
1da177e4
LT		 627 spin_lock_irq(&urb->lock); /* from usb_kill_urb */
628 ++urb->reject;
629 spin_unlock_irq(&urb->lock);
630
631 wait_event(usb_kill_urb_queue,
632 atomic_read(&urb->use_count) == 0);
633
634 spin_lock_irq(&urb->lock);
635 --urb->reject;
636 spin_unlock_irq(&urb->lock);
d5926ae7
AS		 637
638 } else { /* Status URB */
639 if (!hcd->uses_new_polling)
640 del_timer_sync (&hcd->rh_timer);
641 local_irq_disable ();
642 spin_lock (&hcd_root_hub_lock);
643 if (urb == hcd->status_urb) {
644 hcd->status_urb = NULL;
645 urb->hcpriv = NULL;
646 } else
647 urb = NULL; /* wasn't fully queued */
648 spin_unlock (&hcd_root_hub_lock);
649 if (urb)
650 usb_hcd_giveback_urb (hcd, urb, NULL);
651 local_irq_enable ();
652 }
1da177e4
LT		 653
654 return 0;
655}
656
657/*-------------------------------------------------------------------------*/
658
659/* exported only within usbcore */
8561b10f 660struct usb_bus *usb_bus_get(struct usb_bus *bus)
1da177e4 661{
8561b10f
GKH		 662 if (bus)
663 kref_get(&bus->kref);
664 return bus;
665}
1da177e4 666
8561b10f
GKH		 667static void usb_host_release(struct kref *kref)
668{
669 struct usb_bus *bus = container_of(kref, struct usb_bus, kref);
1da177e4 670
8561b10f
GKH		 671 if (bus->release)
672 bus->release(bus);
1da177e4
LT		 673}
674
675/* exported only within usbcore */
8561b10f 676void usb_bus_put(struct usb_bus *bus)
1da177e4
LT		 677{
678 if (bus)
8561b10f 679 kref_put(&bus->kref, usb_host_release);
1da177e4
LT		 680}
681
682/*-------------------------------------------------------------------------*/
683
8561b10f 684static struct class *usb_host_class;
1da177e4
LT		 685
686int usb_host_init(void)
687{
8561b10f
GKH		 688 int retval = 0;
689
690 usb_host_class = class_create(THIS_MODULE, "usb_host");
691 if (IS_ERR(usb_host_class))
692 retval = PTR_ERR(usb_host_class);
693 return retval;
1da177e4
LT		 694}
695
696void usb_host_cleanup(void)
697{
8561b10f 698 class_destroy(usb_host_class);
1da177e4
LT		 699}
700
701/**
702 * usb_bus_init - shared initialization code
703 * @bus: the bus structure being initialized
704 *
705 * This code is used to initialize a usb_bus structure, memory for which is
706 * separately managed.
707 */
708static void usb_bus_init (struct usb_bus *bus)
709{
710 memset (&bus->devmap, 0, sizeof(struct usb_devmap));
711
712 bus->devnum_next = 1;
713
714 bus->root_hub = NULL;
715 bus->hcpriv = NULL;
716 bus->busnum = -1;
717 bus->bandwidth_allocated = 0;
718 bus->bandwidth_int_reqs = 0;
719 bus->bandwidth_isoc_reqs = 0;
720
721 INIT_LIST_HEAD (&bus->bus_list);
722
8561b10f 723 kref_init(&bus->kref);
1da177e4
LT		 724}
725
726/**
727 * usb_alloc_bus - creates a new USB host controller structure
728 * @op: pointer to a struct usb_operations that this bus structure should use
729 * Context: !in_interrupt()
730 *
731 * Creates a USB host controller bus structure with the specified
732 * usb_operations and initializes all the necessary internal objects.
733 *
734 * If no memory is available, NULL is returned.
735 *
736 * The caller should call usb_put_bus() when it is finished with the structure.
737 */
738struct usb_bus *usb_alloc_bus (struct usb_operations *op)
739{
740 struct usb_bus *bus;
741
0a1ef3b5 742 bus = kzalloc (sizeof *bus, GFP_KERNEL);
1da177e4
LT		 743 if (!bus)
744 return NULL;
1da177e4
LT		 745 usb_bus_init (bus);
746 bus->op = op;
747 return bus;
748}
749
750/*-------------------------------------------------------------------------*/
751
752/**
753 * usb_register_bus - registers the USB host controller with the usb core
754 * @bus: pointer to the bus to register
755 * Context: !in_interrupt()
756 *
757 * Assigns a bus number, and links the controller into usbcore data
758 * structures so that it can be seen by scanning the bus list.
759 */
760static int usb_register_bus(struct usb_bus *bus)
761{
762 int busnum;
1da177e4
LT		 763
764 down (&usb_bus_list_lock);
765 busnum = find_next_zero_bit (busmap.busmap, USB_MAXBUS, 1);
766 if (busnum < USB_MAXBUS) {
767 set_bit (busnum, busmap.busmap);
768 bus->busnum = busnum;
769 } else {
770 printk (KERN_ERR "%s: too many buses\n", usbcore_name);
771 up(&usb_bus_list_lock);
772 return -E2BIG;
773 }
774
53f46542
GKH		 775 bus->class_dev = class_device_create(usb_host_class, NULL, MKDEV(0,0),
776 bus->controller, "usb_host%d", busnum);
8561b10f 777 if (IS_ERR(bus->class_dev)) {
1da177e4
LT		 778 clear_bit(busnum, busmap.busmap);
779 up(&usb_bus_list_lock);
8561b10f 780 return PTR_ERR(bus->class_dev);
1da177e4
LT		 781 }
782
8561b10f
GKH		 783 class_set_devdata(bus->class_dev, bus);
784
1da177e4
LT		 785 /* Add it to the local list of buses */
786 list_add (&bus->bus_list, &usb_bus_list);
787 up (&usb_bus_list_lock);
788
3099e75a 789 usb_notify_add_bus(bus);
1da177e4
LT		 790
791 dev_info (bus->controller, "new USB bus registered, assigned bus number %d\n", bus->busnum);
792 return 0;
793}
794
795/**
796 * usb_deregister_bus - deregisters the USB host controller
797 * @bus: pointer to the bus to deregister
798 * Context: !in_interrupt()
799 *
800 * Recycles the bus number, and unlinks the controller from usbcore data
801 * structures so that it won't be seen by scanning the bus list.
802 */
803static void usb_deregister_bus (struct usb_bus *bus)
804{
805 dev_info (bus->controller, "USB bus %d deregistered\n", bus->busnum);
806
807 /*
808 * NOTE: make sure that all the devices are removed by the
809 * controller code, as well as having it call this when cleaning
810 * itself up
811 */
812 down (&usb_bus_list_lock);
813 list_del (&bus->bus_list);
814 up (&usb_bus_list_lock);
815
3099e75a 816 usb_notify_remove_bus(bus);
1da177e4
LT		 817
818 clear_bit (bus->busnum, busmap.busmap);
819
8561b10f 820 class_device_unregister(bus->class_dev);
1da177e4
LT		 821}
822
823/**
8ec8d20b 824 * register_root_hub - called by usb_add_hcd() to register a root hub
1da177e4
LT		 825 * @usb_dev: the usb root hub device to be registered.
826 * @hcd: host controller for this root hub
827 *
8ec8d20b
AS		 828 * This function registers the root hub with the USB subsystem. It sets up
829 * the device properly in the device tree and stores the root_hub pointer
830 * in the bus structure, then calls usb_new_device() to register the usb
831 * device. It also assigns the root hub's USB address (always 1).
1da177e4 832 */
8ec8d20b
AS		 833static int register_root_hub (struct usb_device *usb_dev,
834 struct usb_hcd *hcd)
1da177e4
LT		 835{
836 struct device *parent_dev = hcd->self.controller;
837 const int devnum = 1;
838 int retval;
839
1da177e4
LT		 840 usb_dev->devnum = devnum;
841 usb_dev->bus->devnum_next = devnum + 1;
842 memset (&usb_dev->bus->devmap.devicemap, 0,
843 sizeof usb_dev->bus->devmap.devicemap);
844 set_bit (devnum, usb_dev->bus->devmap.devicemap);
845 usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
846
847 down (&usb_bus_list_lock);
848 usb_dev->bus->root_hub = usb_dev;
849
850 usb_dev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
851 retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE);
852 if (retval != sizeof usb_dev->descriptor) {
853 usb_dev->bus->root_hub = NULL;
854 up (&usb_bus_list_lock);
855 dev_dbg (parent_dev, "can't read %s device descriptor %d\n",
856 usb_dev->dev.bus_id, retval);
857 return (retval < 0) ? retval : -EMSGSIZE;
858 }
859
860 usb_lock_device (usb_dev);
861 retval = usb_new_device (usb_dev);
862 usb_unlock_device (usb_dev);
863 if (retval) {
864 usb_dev->bus->root_hub = NULL;
865 dev_err (parent_dev, "can't register root hub for %s, %d\n",
866 usb_dev->dev.bus_id, retval);
867 }
868 up (&usb_bus_list_lock);
869
870 if (retval == 0) {
871 spin_lock_irq (&hcd_root_hub_lock);
872 hcd->rh_registered = 1;
873 spin_unlock_irq (&hcd_root_hub_lock);
874
875 /* Did the HC die before the root hub was registered? */
876 if (hcd->state == HC_STATE_HALT)
877 usb_hc_died (hcd); /* This time clean up */
878 }
879
880 return retval;
881}
1da177e4 882
d5926ae7
AS		 883void usb_enable_root_hub_irq (struct usb_bus *bus)
884{
885 struct usb_hcd *hcd;
886
887 hcd = container_of (bus, struct usb_hcd, self);
888 if (hcd->driver->hub_irq_enable && !hcd->poll_rh &&
889 hcd->state != HC_STATE_HALT)
890 hcd->driver->hub_irq_enable (hcd);
891}
892
1da177e4
LT		 893
894/*-------------------------------------------------------------------------*/
895
896/**
897 * usb_calc_bus_time - approximate periodic transaction time in nanoseconds
898 * @speed: from dev->speed; USB_SPEED_{LOW,FULL,HIGH}
899 * @is_input: true iff the transaction sends data to the host
900 * @isoc: true for isochronous transactions, false for interrupt ones
901 * @bytecount: how many bytes in the transaction.
902 *
903 * Returns approximate bus time in nanoseconds for a periodic transaction.
904 * See USB 2.0 spec section 5.11.3; only periodic transfers need to be
905 * scheduled in software, this function is only used for such scheduling.
906 */
907long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount)
908{
909 unsigned long tmp;
910
911 switch (speed) {
912 case USB_SPEED_LOW: /* INTR only */
913 if (is_input) {
914 tmp = (67667L * (31L + 10L * BitTime (bytecount))) / 1000L;
915 return (64060L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
916 } else {
917 tmp = (66700L * (31L + 10L * BitTime (bytecount))) / 1000L;
918 return (64107L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
919 }
920 case USB_SPEED_FULL: /* ISOC or INTR */
921 if (isoc) {
922 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
923 return (((is_input) ? 7268L : 6265L) + BW_HOST_DELAY + tmp);
924 } else {
925 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
926 return (9107L + BW_HOST_DELAY + tmp);
927 }
928 case USB_SPEED_HIGH: /* ISOC or INTR */
929 // FIXME adjust for input vs output
930 if (isoc)
498f78e6 931 tmp = HS_NSECS_ISO (bytecount);
1da177e4 932 else
498f78e6 933 tmp = HS_NSECS (bytecount);
1da177e4
LT		 934 return tmp;
935 default:
936 pr_debug ("%s: bogus device speed!\n", usbcore_name);
937 return -1;
938 }
939}
940EXPORT_SYMBOL (usb_calc_bus_time);
941
942/*
943 * usb_check_bandwidth():
944 *
945 * old_alloc is from host_controller->bandwidth_allocated in microseconds;
946 * bustime is from calc_bus_time(), but converted to microseconds.
947 *
948 * returns <bustime in us> if successful,
949 * or -ENOSPC if bandwidth request fails.
950 *
951 * FIXME:
952 * This initial implementation does not use Endpoint.bInterval
953 * in managing bandwidth allocation.
954 * It probably needs to be expanded to use Endpoint.bInterval.
955 * This can be done as a later enhancement (correction).
956 *
957 * This will also probably require some kind of
958 * frame allocation tracking...meaning, for example,
959 * that if multiple drivers request interrupts every 10 USB frames,
960 * they don't all have to be allocated at
961 * frame numbers N, N+10, N+20, etc. Some of them could be at
962 * N+11, N+21, N+31, etc., and others at
963 * N+12, N+22, N+32, etc.
964 *
965 * Similarly for isochronous transfers...
966 *
967 * Individual HCDs can schedule more directly ... this logic
968 * is not correct for high speed transfers.
969 */
970int usb_check_bandwidth (struct usb_device *dev, struct urb *urb)
971{
972 unsigned int pipe = urb->pipe;
973 long bustime;
974 int is_in = usb_pipein (pipe);
975 int is_iso = usb_pipeisoc (pipe);
976 int old_alloc = dev->bus->bandwidth_allocated;
977 int new_alloc;
978
979
980 bustime = NS_TO_US (usb_calc_bus_time (dev->speed, is_in, is_iso,
981 usb_maxpacket (dev, pipe, !is_in)));
982 if (is_iso)
983 bustime /= urb->number_of_packets;
984
985 new_alloc = old_alloc + (int) bustime;
986 if (new_alloc > FRAME_TIME_MAX_USECS_ALLOC) {
987#ifdef DEBUG
988 char *mode =
989#ifdef CONFIG_USB_BANDWIDTH
990 "";
991#else
992 "would have ";
993#endif
994 dev_dbg (&dev->dev, "usb_check_bandwidth %sFAILED: %d + %ld = %d usec\n",
995 mode, old_alloc, bustime, new_alloc);
996#endif
997#ifdef CONFIG_USB_BANDWIDTH
998 bustime = -ENOSPC; /* report error */
999#endif
1000 }
1001
1002 return bustime;
1003}
1004EXPORT_SYMBOL (usb_check_bandwidth);
1005
1006
1007/**
1008 * usb_claim_bandwidth - records bandwidth for a periodic transfer
1009 * @dev: source/target of request
1010 * @urb: request (urb->dev == dev)
1011 * @bustime: bandwidth consumed, in (average) microseconds per frame
1012 * @isoc: true iff the request is isochronous
1013 *
1014 * Bus bandwidth reservations are recorded purely for diagnostic purposes.
1015 * HCDs are expected not to overcommit periodic bandwidth, and to record such
1016 * reservations whenever endpoints are added to the periodic schedule.
1017 *
1018 * FIXME averaging per-frame is suboptimal. Better to sum over the HCD's
1019 * entire periodic schedule ... 32 frames for OHCI, 1024 for UHCI, settable
1020 * for EHCI (256/512/1024 frames, default 1024) and have the bus expose how
1021 * large its periodic schedule is.
1022 */
1023void usb_claim_bandwidth (struct usb_device *dev, struct urb *urb, int bustime, int isoc)
1024{
1025 dev->bus->bandwidth_allocated += bustime;
1026 if (isoc)
1027 dev->bus->bandwidth_isoc_reqs++;
1028 else
1029 dev->bus->bandwidth_int_reqs++;
1030 urb->bandwidth = bustime;
1031
1032#ifdef USB_BANDWIDTH_MESSAGES
1033 dev_dbg (&dev->dev, "bandwidth alloc increased by %d (%s) to %d for %d requesters\n",
1034 bustime,
1035 isoc ? "ISOC" : "INTR",
1036 dev->bus->bandwidth_allocated,
1037 dev->bus->bandwidth_int_reqs + dev->bus->bandwidth_isoc_reqs);
1038#endif
1039}
1040EXPORT_SYMBOL (usb_claim_bandwidth);
1041
1042
1043/**
1044 * usb_release_bandwidth - reverses effect of usb_claim_bandwidth()
1045 * @dev: source/target of request
1046 * @urb: request (urb->dev == dev)
1047 * @isoc: true iff the request is isochronous
1048 *
1049 * This records that previously allocated bandwidth has been released.
1050 * Bandwidth is released when endpoints are removed from the host controller's
1051 * periodic schedule.
1052 */
1053void usb_release_bandwidth (struct usb_device *dev, struct urb *urb, int isoc)
1054{
1055 dev->bus->bandwidth_allocated -= urb->bandwidth;
1056 if (isoc)
1057 dev->bus->bandwidth_isoc_reqs--;
1058 else
1059 dev->bus->bandwidth_int_reqs--;
1060
1061#ifdef USB_BANDWIDTH_MESSAGES
1062 dev_dbg (&dev->dev, "bandwidth alloc reduced by %d (%s) to %d for %d requesters\n",
1063 urb->bandwidth,
1064 isoc ? "ISOC" : "INTR",
1065 dev->bus->bandwidth_allocated,
1066 dev->bus->bandwidth_int_reqs + dev->bus->bandwidth_isoc_reqs);
1067#endif
1068 urb->bandwidth = 0;
1069}
1070EXPORT_SYMBOL (usb_release_bandwidth);
1071
1072
1073/*-------------------------------------------------------------------------*/
1074
1075/*
1076 * Generic HC operations.
1077 */
1078
1079/*-------------------------------------------------------------------------*/
1080
1081static void urb_unlink (struct urb *urb)
1082{
1083 unsigned long flags;
1084
1085 /* Release any periodic transfer bandwidth */
1086 if (urb->bandwidth)
1087 usb_release_bandwidth (urb->dev, urb,
1088 usb_pipeisoc (urb->pipe));
1089
1090 /* clear all state linking urb to this dev (and hcd) */
1091
1092 spin_lock_irqsave (&hcd_data_lock, flags);
1093 list_del_init (&urb->urb_list);
1094 spin_unlock_irqrestore (&hcd_data_lock, flags);
1095 usb_put_dev (urb->dev);
1096}
1097
1098
1099/* may be called in any context with a valid urb->dev usecount
1100 * caller surrenders "ownership" of urb
1101 * expects usb_submit_urb() to have sanity checked and conditioned all
1102 * inputs in the urb
1103 */
55016f10 1104static int hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
1da177e4
LT		 1105{
1106 int status;
1107 struct usb_hcd *hcd = urb->dev->bus->hcpriv;
1108 struct usb_host_endpoint *ep;
1109 unsigned long flags;
1110
1111 if (!hcd)
1112 return -ENODEV;
1113
1114 usbmon_urb_submit(&hcd->self, urb);
1115
1116 /*
1117 * Atomically queue the urb, first to our records, then to the HCD.
1118 * Access to urb->status is controlled by urb->lock ... changes on
1119 * i/o completion (normal or fault) or unlinking.
1120 */
1121
1122 // FIXME: verify that quiescing hc works right (RH cleans up)
1123
1124 spin_lock_irqsave (&hcd_data_lock, flags);
1125 ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out)
1126 [usb_pipeendpoint(urb->pipe)];
1127 if (unlikely (!ep))
1128 status = -ENOENT;
1129 else if (unlikely (urb->reject))
1130 status = -EPERM;
1131 else switch (hcd->state) {
1132 case HC_STATE_RUNNING:
1133 case HC_STATE_RESUMING:
979d5199 1134doit:
1da177e4
LT		 1135 usb_get_dev (urb->dev);
1136 list_add_tail (&urb->urb_list, &ep->urb_list);
1137 status = 0;
1138 break;
979d5199
DB		 1139 case HC_STATE_SUSPENDED:
1140 /* HC upstream links (register access, wakeup signaling) can work
1141 * even when the downstream links (and DMA etc) are quiesced; let
1142 * usbcore talk to the root hub.
1143 */
1144 if (hcd->self.controller->power.power_state.event == PM_EVENT_ON
1145 && urb->dev->parent == NULL)
1146 goto doit;
1147 /* FALL THROUGH */
1da177e4
LT		 1148 default:
1149 status = -ESHUTDOWN;
1150 break;
1151 }
1152 spin_unlock_irqrestore (&hcd_data_lock, flags);
1153 if (status) {
1154 INIT_LIST_HEAD (&urb->urb_list);
1155 usbmon_urb_submit_error(&hcd->self, urb, status);
1156 return status;
1157 }
1158
1159 /* increment urb's reference count as part of giving it to the HCD
1160 * (which now controls it). HCD guarantees that it either returns
1161 * an error or calls giveback(), but not both.
1162 */
1163 urb = usb_get_urb (urb);
1164 atomic_inc (&urb->use_count);
1165
1166 if (urb->dev == hcd->self.root_hub) {
1167 /* NOTE: requirement on hub callers (usbfs and the hub
1168 * driver, for now) that URBs' urb->transfer_buffer be
1169 * valid and usb_buffer_{sync,unmap}() not be needed, since
1170 * they could clobber root hub response data.
1171 */
1172 status = rh_urb_enqueue (hcd, urb);
1173 goto done;
1174 }
1175
1176 /* lower level hcd code should use *_dma exclusively,
1177 * unless it uses pio or talks to another transport.
1178 */
1179 if (hcd->self.controller->dma_mask) {
1180 if (usb_pipecontrol (urb->pipe)
1181 && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
1182 urb->setup_dma = dma_map_single (
1183 hcd->self.controller,
1184 urb->setup_packet,
1185 sizeof (struct usb_ctrlrequest),
1186 DMA_TO_DEVICE);
1187 if (urb->transfer_buffer_length != 0
1188 && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP))
1189 urb->transfer_dma = dma_map_single (
1190 hcd->self.controller,
1191 urb->transfer_buffer,
1192 urb->transfer_buffer_length,
1193 usb_pipein (urb->pipe)
1194 ? DMA_FROM_DEVICE
1195 : DMA_TO_DEVICE);
1196 }
1197
1198 status = hcd->driver->urb_enqueue (hcd, ep, urb, mem_flags);
1199done:
1200 if (unlikely (status)) {
1201 urb_unlink (urb);
1202 atomic_dec (&urb->use_count);
1203 if (urb->reject)
1204 wake_up (&usb_kill_urb_queue);
1205 usb_put_urb (urb);
1206 usbmon_urb_submit_error(&hcd->self, urb, status);
1207 }
1208 return status;
1209}
1210
1211/*-------------------------------------------------------------------------*/
1212
1213/* called in any context */
1214static int hcd_get_frame_number (struct usb_device *udev)
1215{
1216 struct usb_hcd *hcd = (struct usb_hcd *)udev->bus->hcpriv;
1217 if (!HC_IS_RUNNING (hcd->state))
1218 return -ESHUTDOWN;
1219 return hcd->driver->get_frame_number (hcd);
1220}
1221
1222/*-------------------------------------------------------------------------*/
1223
1224/* this makes the hcd giveback() the urb more quickly, by kicking it
1225 * off hardware queues (which may take a while) and returning it as
1226 * soon as practical. we've already set up the urb's return status,
1227 * but we can't know if the callback completed already.
1228 */
1229static int
1230unlink1 (struct usb_hcd *hcd, struct urb *urb)
1231{
1232 int value;
1233
1234 if (urb->dev == hcd->self.root_hub)
1235 value = usb_rh_urb_dequeue (hcd, urb);
1236 else {
1237
1238 /* The only reason an HCD might fail this call is if
1239 * it has not yet fully queued the urb to begin with.
1240 * Such failures should be harmless. */
1241 value = hcd->driver->urb_dequeue (hcd, urb);
1242 }
1243
1244 if (value != 0)
1245 dev_dbg (hcd->self.controller, "dequeue %p --> %d\n",
1246 urb, value);
1247 return value;
1248}
1249
1250/*
1251 * called in any context
1252 *
1253 * caller guarantees urb won't be recycled till both unlink()
1254 * and the urb's completion function return
1255 */
1256static int hcd_unlink_urb (struct urb *urb, int status)
1257{
1258 struct usb_host_endpoint *ep;
1259 struct usb_hcd *hcd = NULL;
1260 struct device *sys = NULL;
1261 unsigned long flags;
1262 struct list_head *tmp;
1263 int retval;
1264
1265 if (!urb)
1266 return -EINVAL;
1267 if (!urb->dev || !urb->dev->bus)
1268 return -ENODEV;
1269 ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out)
1270 [usb_pipeendpoint(urb->pipe)];
1271 if (!ep)
1272 return -ENODEV;
1273
1274 /*
1275 * we contend for urb->status with the hcd core,
1276 * which changes it while returning the urb.
1277 *
1278 * Caller guaranteed that the urb pointer hasn't been freed, and
1279 * that it was submitted. But as a rule it can't know whether or
1280 * not it's already been unlinked ... so we respect the reversed
1281 * lock sequence needed for the usb_hcd_giveback_urb() code paths
1282 * (urb lock, then hcd_data_lock) in case some other CPU is now
1283 * unlinking it.
1284 */
1285 spin_lock_irqsave (&urb->lock, flags);
1286 spin_lock (&hcd_data_lock);
1287
1288 sys = &urb->dev->dev;
1289 hcd = urb->dev->bus->hcpriv;
1290 if (hcd == NULL) {
1291 retval = -ENODEV;
1292 goto done;
1293 }
1294
1da177e4
LT		 1295 /* insist the urb is still queued */
1296 list_for_each(tmp, &ep->urb_list) {
1297 if (tmp == &urb->urb_list)
1298 break;
1299 }
1300 if (tmp != &urb->urb_list) {
1301 retval = -EIDRM;
1302 goto done;
1303 }
1304
1305 /* Any status except -EINPROGRESS means something already started to
1306 * unlink this URB from the hardware. So there's no more work to do.
1307 */
1308 if (urb->status != -EINPROGRESS) {
1309 retval = -EBUSY;
1310 goto done;
1311 }
1312
1313 /* IRQ setup can easily be broken so that USB controllers
1314 * never get completion IRQs ... maybe even the ones we need to
1315 * finish unlinking the initial failed usb_set_address()
1316 * or device descriptor fetch.
1317 */
1318 if (!hcd->saw_irq && hcd->self.root_hub != urb->dev) {
1319 dev_warn (hcd->self.controller, "Unlink after no-IRQ? "
1320 "Controller is probably using the wrong IRQ."
1321 "\n");
1322 hcd->saw_irq = 1;
1323 }
1324
1325 urb->status = status;
1326
1327 spin_unlock (&hcd_data_lock);
1328 spin_unlock_irqrestore (&urb->lock, flags);
1329
1330 retval = unlink1 (hcd, urb);
1331 if (retval == 0)
1332 retval = -EINPROGRESS;
1333 return retval;
1334
1335done:
1336 spin_unlock (&hcd_data_lock);
1337 spin_unlock_irqrestore (&urb->lock, flags);
1338 if (retval != -EIDRM && sys && sys->driver)
1339 dev_dbg (sys, "hcd_unlink_urb %p fail %d\n", urb, retval);
1340 return retval;
1341}
1342
1343/*-------------------------------------------------------------------------*/
1344
1345/* disables the endpoint: cancels any pending urbs, then synchronizes with
1346 * the hcd to make sure all endpoint state is gone from hardware. use for
1347 * set_configuration, set_interface, driver removal, physical disconnect.
1348 *
1349 * example: a qh stored in ep->hcpriv, holding state related to endpoint
1350 * type, maxpacket size, toggle, halt status, and scheduling.
1351 */
1352static void
1353hcd_endpoint_disable (struct usb_device *udev, struct usb_host_endpoint *ep)
1354{
1355 struct usb_hcd *hcd;
1356 struct urb *urb;
1357
1358 hcd = udev->bus->hcpriv;
1359
d5926ae7
AS		 1360 WARN_ON (!HC_IS_RUNNING (hcd->state) && hcd->state != HC_STATE_HALT &&
1361 udev->state != USB_STATE_NOTATTACHED);
1da177e4
LT		 1362
1363 local_irq_disable ();
1364
1365 /* FIXME move most of this into message.c as part of its
1366 * endpoint disable logic
1367 */
1368
1369 /* ep is already gone from udev->ep_{in,out}[]; no more submits */
1370rescan:
1371 spin_lock (&hcd_data_lock);
1372 list_for_each_entry (urb, &ep->urb_list, urb_list) {
1373 int tmp;
1374
1375 /* another cpu may be in hcd, spinning on hcd_data_lock
1376 * to giveback() this urb. the races here should be
1377 * small, but a full fix needs a new "can't submit"
1378 * urb state.
1379 * FIXME urb->reject should allow that...
1380 */
1381 if (urb->status != -EINPROGRESS)
1382 continue;
1383 usb_get_urb (urb);
1384 spin_unlock (&hcd_data_lock);
1385
1386 spin_lock (&urb->lock);
1387 tmp = urb->status;
1388 if (tmp == -EINPROGRESS)
1389 urb->status = -ESHUTDOWN;
1390 spin_unlock (&urb->lock);
1391
1392 /* kick hcd unless it's already returning this */
1393 if (tmp == -EINPROGRESS) {
1394 tmp = urb->pipe;
1395 unlink1 (hcd, urb);
1396 dev_dbg (hcd->self.controller,
1397 "shutdown urb %p pipe %08x ep%d%s%s\n",
1398 urb, tmp, usb_pipeendpoint (tmp),
1399 (tmp & USB_DIR_IN) ? "in" : "out",
1400 ({ char *s; \
1401 switch (usb_pipetype (tmp)) { \
1402 case PIPE_CONTROL: s = ""; break; \
1403 case PIPE_BULK: s = "-bulk"; break; \
1404 case PIPE_INTERRUPT: s = "-intr"; break; \
1405 default: s = "-iso"; break; \
1406 }; s;}));
1407 }
1408 usb_put_urb (urb);
1409
1410 /* list contents may have changed */
1411 goto rescan;
1412 }
1413 spin_unlock (&hcd_data_lock);
1414 local_irq_enable ();
1415
1416 /* synchronize with the hardware, so old configuration state
1417 * clears out immediately (and will be freed).
1418 */
1419 might_sleep ();
1420 if (hcd->driver->endpoint_disable)
1421 hcd->driver->endpoint_disable (hcd, ep);
1422}
1423
1424/*-------------------------------------------------------------------------*/
1425
9293677a 1426#ifdef CONFIG_PM
1da177e4 1427
0c0382e3 1428int hcd_bus_suspend (struct usb_bus *bus)
1da177e4
LT		 1429{
1430 struct usb_hcd *hcd;
9293677a 1431 int status;
1da177e4
LT		 1432
1433 hcd = container_of (bus, struct usb_hcd, self);
0c0382e3 1434 if (!hcd->driver->bus_suspend)
9293677a
DB		 1435 return -ENOENT;
1436 hcd->state = HC_STATE_QUIESCING;
0c0382e3 1437 status = hcd->driver->bus_suspend (hcd);
9293677a
DB		 1438 if (status == 0)
1439 hcd->state = HC_STATE_SUSPENDED;
1440 else
1441 dev_dbg(&bus->root_hub->dev, "%s fail, err %d\n",
1442 "suspend", status);
1443 return status;
1da177e4
LT		 1444}
1445
0c0382e3 1446int hcd_bus_resume (struct usb_bus *bus)
1da177e4
LT		 1447{
1448 struct usb_hcd *hcd;
9293677a 1449 int status;
1da177e4
LT		 1450
1451 hcd = container_of (bus, struct usb_hcd, self);
0c0382e3 1452 if (!hcd->driver->bus_resume)
9293677a 1453 return -ENOENT;
979d5199
DB		 1454 if (hcd->state == HC_STATE_RUNNING)
1455 return 0;
9293677a 1456 hcd->state = HC_STATE_RESUMING;
0c0382e3 1457 status = hcd->driver->bus_resume (hcd);
9293677a
DB		 1458 if (status == 0)
1459 hcd->state = HC_STATE_RUNNING;
1460 else {
1461 dev_dbg(&bus->root_hub->dev, "%s fail, err %d\n",
1462 "resume", status);
1463 usb_hc_died(hcd);
1464 }
1465 return status;
1da177e4
LT		 1466}
1467
979d5199
DB		 1468/*
1469 * usb_hcd_suspend_root_hub - HCD autosuspends downstream ports
1470 * @hcd: host controller for this root hub
1471 *
1472 * This call arranges that usb_hcd_resume_root_hub() is safe to call later;
1473 * that the HCD's root hub polling is deactivated; and that the root's hub
1474 * driver is suspended. HCDs may call this to autosuspend when their root
1475 * hub's downstream ports are all inactive: unpowered, disconnected,
1476 * disabled, or suspended.
1477 *
1478 * The HCD will autoresume on device connect change detection (using SRP
1479 * or a D+/D- pullup). The HCD also autoresumes on remote wakeup signaling
1480 * from any ports that are suspended (if that is enabled). In most cases,
1481 * overcurrent signaling (on powered ports) will also start autoresume.
1482 *
1483 * Always called with IRQs blocked.
1484 */
1485void usb_hcd_suspend_root_hub (struct usb_hcd *hcd)
1486{
1487 struct urb *urb;
1488
1489 spin_lock (&hcd_root_hub_lock);
1490 usb_suspend_root_hub (hcd->self.root_hub);
1491
1492 /* force status urb to complete/unlink while suspended */
1493 if (hcd->status_urb) {
1494 urb = hcd->status_urb;
1495 urb->status = -ECONNRESET;
1496 urb->hcpriv = NULL;
1497 urb->actual_length = 0;
1498
1499 del_timer (&hcd->rh_timer);
1500 hcd->poll_pending = 0;
1501 hcd->status_urb = NULL;
1502 } else
1503 urb = NULL;
1504 spin_unlock (&hcd_root_hub_lock);
1505 hcd->state = HC_STATE_SUSPENDED;
1506
1507 if (urb)
1508 usb_hcd_giveback_urb (hcd, urb, NULL);
1509}
1510EXPORT_SYMBOL_GPL(usb_hcd_suspend_root_hub);
1511
1da177e4
LT		 1512/**
1513 * usb_hcd_resume_root_hub - called by HCD to resume its root hub
1514 * @hcd: host controller for this root hub
1515 *
1516 * The USB host controller calls this function when its root hub is
1517 * suspended (with the remote wakeup feature enabled) and a remote
1518 * wakeup request is received. It queues a request for khubd to
979d5199 1519 * resume the root hub (that is, manage its downstream ports again).
1da177e4
LT		 1520 */
1521void usb_hcd_resume_root_hub (struct usb_hcd *hcd)
1522{
1523 unsigned long flags;
1524
1525 spin_lock_irqsave (&hcd_root_hub_lock, flags);
1526 if (hcd->rh_registered)
1527 usb_resume_root_hub (hcd->self.root_hub);
1528 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
1529}
9293677a 1530EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub);
1da177e4 1531
1da177e4 1532#endif
1da177e4
LT		 1533
1534/*-------------------------------------------------------------------------*/
1535
1536#ifdef CONFIG_USB_OTG
1537
1538/**
1539 * usb_bus_start_enum - start immediate enumeration (for OTG)
1540 * @bus: the bus (must use hcd framework)
1541 * @port_num: 1-based number of port; usually bus->otg_port
1542 * Context: in_interrupt()
1543 *
1544 * Starts enumeration, with an immediate reset followed later by
1545 * khubd identifying and possibly configuring the device.
1546 * This is needed by OTG controller drivers, where it helps meet
1547 * HNP protocol timing requirements for starting a port reset.
1548 */
1549int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num)
1550{
1551 struct usb_hcd *hcd;
1552 int status = -EOPNOTSUPP;
1553
1554 /* NOTE: since HNP can't start by grabbing the bus's address0_sem,
1555 * boards with root hubs hooked up to internal devices (instead of
1556 * just the OTG port) may need more attention to resetting...
1557 */
1558 hcd = container_of (bus, struct usb_hcd, self);
1559 if (port_num && hcd->driver->start_port_reset)
1560 status = hcd->driver->start_port_reset(hcd, port_num);
1561
1562 /* run khubd shortly after (first) root port reset finishes;
1563 * it may issue others, until at least 50 msecs have passed.
1564 */
1565 if (status == 0)
1566 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10));
1567 return status;
1568}
1569EXPORT_SYMBOL (usb_bus_start_enum);
1570
1571#endif
1572
1573/*-------------------------------------------------------------------------*/
1574
1575/*
1576 * usb_hcd_operations - adapts usb_bus framework to HCD framework (bus glue)
1577 */
1578static struct usb_operations usb_hcd_operations = {
1579 .get_frame_number = hcd_get_frame_number,
1580 .submit_urb = hcd_submit_urb,
1581 .unlink_urb = hcd_unlink_urb,
1582 .buffer_alloc = hcd_buffer_alloc,
1583 .buffer_free = hcd_buffer_free,
1584 .disable = hcd_endpoint_disable,
1da177e4
LT		 1585};
1586
1587/*-------------------------------------------------------------------------*/
1588
1589/**
1590 * usb_hcd_giveback_urb - return URB from HCD to device driver
1591 * @hcd: host controller returning the URB
1592 * @urb: urb being returned to the USB device driver.
1593 * @regs: pt_regs, passed down to the URB completion handler
1594 * Context: in_interrupt()
1595 *
1596 * This hands the URB from HCD to its USB device driver, using its
1597 * completion function. The HCD has freed all per-urb resources
1598 * (and is done using urb->hcpriv). It also released all HCD locks;
1599 * the device driver won't cause problems if it frees, modifies,
1600 * or resubmits this URB.
1601 */
1602void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb, struct pt_regs *regs)
1603{
1604 int at_root_hub;
1605
1606 at_root_hub = (urb->dev == hcd->self.root_hub);
1607 urb_unlink (urb);
1608
1609 /* lower level hcd code should use *_dma exclusively */
1610 if (hcd->self.controller->dma_mask && !at_root_hub) {
1611 if (usb_pipecontrol (urb->pipe)
1612 && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
1613 dma_unmap_single (hcd->self.controller, urb->setup_dma,
1614 sizeof (struct usb_ctrlrequest),
1615 DMA_TO_DEVICE);
1616 if (urb->transfer_buffer_length != 0
1617 && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP))
1618 dma_unmap_single (hcd->self.controller,
1619 urb->transfer_dma,
1620 urb->transfer_buffer_length,
1621 usb_pipein (urb->pipe)
1622 ? DMA_FROM_DEVICE
1623 : DMA_TO_DEVICE);
1624 }
1625
1626 usbmon_urb_complete (&hcd->self, urb);
1627 /* pass ownership to the completion handler */
1628 urb->complete (urb, regs);
1629 atomic_dec (&urb->use_count);
1630 if (unlikely (urb->reject))
1631 wake_up (&usb_kill_urb_queue);
1632 usb_put_urb (urb);
1633}
1634EXPORT_SYMBOL (usb_hcd_giveback_urb);
1635
1636/*-------------------------------------------------------------------------*/
1637
1638/**
1639 * usb_hcd_irq - hook IRQs to HCD framework (bus glue)
1640 * @irq: the IRQ being raised
1641 * @__hcd: pointer to the HCD whose IRQ is being signaled
1642 * @r: saved hardware registers
1643 *
1644 * If the controller isn't HALTed, calls the driver's irq handler.
1645 * Checks whether the controller is now dead.
1646 */
1647irqreturn_t usb_hcd_irq (int irq, void *__hcd, struct pt_regs * r)
1648{
1649 struct usb_hcd *hcd = __hcd;
1650 int start = hcd->state;
1651
1652 if (start == HC_STATE_HALT)
1653 return IRQ_NONE;
1654 if (hcd->driver->irq (hcd, r) == IRQ_NONE)
1655 return IRQ_NONE;
1656
1657 hcd->saw_irq = 1;
f1a15606 1658 if (hcd->state == HC_STATE_HALT)
1da177e4
LT		 1659 usb_hc_died (hcd);
1660 return IRQ_HANDLED;
1661}
1662
1663/*-------------------------------------------------------------------------*/
1664
1665/**
1666 * usb_hc_died - report abnormal shutdown of a host controller (bus glue)
1667 * @hcd: pointer to the HCD representing the controller
1668 *
1669 * This is called by bus glue to report a USB host controller that died
1670 * while operations may still have been pending. It's called automatically
1671 * by the PCI glue, so only glue for non-PCI busses should need to call it.
1672 */
1673void usb_hc_died (struct usb_hcd *hcd)
1674{
1675 unsigned long flags;
1676
1677 dev_err (hcd->self.controller, "HC died; cleaning up\n");
1678
1679 spin_lock_irqsave (&hcd_root_hub_lock, flags);
1680 if (hcd->rh_registered) {
d5926ae7 1681 hcd->poll_rh = 0;
1da177e4
LT		 1682
1683 /* make khubd clean up old urbs and devices */
1684 usb_set_device_state (hcd->self.root_hub,
1685 USB_STATE_NOTATTACHED);
1686 usb_kick_khubd (hcd->self.root_hub);
1687 }
1688 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
1689}
1690EXPORT_SYMBOL_GPL (usb_hc_died);
1691
1692/*-------------------------------------------------------------------------*/
1693
1694static void hcd_release (struct usb_bus *bus)
1695{
1696 struct usb_hcd *hcd;
1697
1698 hcd = container_of(bus, struct usb_hcd, self);
1699 kfree(hcd);
1700}
1701
1702/**
1703 * usb_create_hcd - create and initialize an HCD structure
1704 * @driver: HC driver that will use this hcd
1705 * @dev: device for this HC, stored in hcd->self.controller
1706 * @bus_name: value to store in hcd->self.bus_name
1707 * Context: !in_interrupt()
1708 *
1709 * Allocate a struct usb_hcd, with extra space at the end for the
1710 * HC driver's private data. Initialize the generic members of the
1711 * hcd structure.
1712 *
1713 * If memory is unavailable, returns NULL.
1714 */
1715struct usb_hcd *usb_create_hcd (const struct hc_driver *driver,
1716 struct device *dev, char *bus_name)
1717{
1718 struct usb_hcd *hcd;
1719
7b842b6e 1720 hcd = kzalloc(sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL);
1da177e4
LT		 1721 if (!hcd) {
1722 dev_dbg (dev, "hcd alloc failed\n");
1723 return NULL;
1724 }
1725 dev_set_drvdata(dev, hcd);
1726
1727 usb_bus_init(&hcd->self);
1728 hcd->self.op = &usb_hcd_operations;
1729 hcd->self.hcpriv = hcd;
1730 hcd->self.release = &hcd_release;
1731 hcd->self.controller = dev;
1732 hcd->self.bus_name = bus_name;
1733
1734 init_timer(&hcd->rh_timer);
d5926ae7
AS		 1735 hcd->rh_timer.function = rh_timer_func;
1736 hcd->rh_timer.data = (unsigned long) hcd;
1da177e4
LT		 1737
1738 hcd->driver = driver;
1739 hcd->product_desc = (driver->product_desc) ? driver->product_desc :
1740 "USB Host Controller";
1741
1742 return hcd;
1743}
1744EXPORT_SYMBOL (usb_create_hcd);
1745
1746void usb_put_hcd (struct usb_hcd *hcd)
1747{
1748 dev_set_drvdata(hcd->self.controller, NULL);
1749 usb_bus_put(&hcd->self);
1750}
1751EXPORT_SYMBOL (usb_put_hcd);
1752
1753/**
1754 * usb_add_hcd - finish generic HCD structure initialization and register
1755 * @hcd: the usb_hcd structure to initialize
1756 * @irqnum: Interrupt line to allocate
1757 * @irqflags: Interrupt type flags
1758 *
1759 * Finish the remaining parts of generic HCD initialization: allocate the
1760 * buffers of consistent memory, register the bus, request the IRQ line,
1761 * and call the driver's reset() and start() routines.
1762 */
1763int usb_add_hcd(struct usb_hcd *hcd,
1764 unsigned int irqnum, unsigned long irqflags)
1765{
8ec8d20b
AS		 1766 int retval;
1767 struct usb_device *rhdev;
1da177e4
LT		 1768
1769 dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
1770
1771 /* till now HC has been in an indeterminate state ... */
1772 if (hcd->driver->reset && (retval = hcd->driver->reset(hcd)) < 0) {
1773 dev_err(hcd->self.controller, "can't reset\n");
1774 return retval;
1775 }
1776
1777 if ((retval = hcd_buffer_create(hcd)) != 0) {
1778 dev_dbg(hcd->self.controller, "pool alloc failed\n");
1779 return retval;
1780 }
1781
1782 if ((retval = usb_register_bus(&hcd->self)) < 0)
8ec8d20b 1783 goto err_register_bus;
1da177e4
LT		 1784
1785 if (hcd->driver->irq) {
1786 char buf[8], *bufp = buf;
1787
1788#ifdef __sparc__
1789 bufp = __irq_itoa(irqnum);
1790#else
1791 sprintf(buf, "%d", irqnum);
1792#endif
1793
1794 snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d",
1795 hcd->driver->description, hcd->self.busnum);
1796 if ((retval = request_irq(irqnum, &usb_hcd_irq, irqflags,
1797 hcd->irq_descr, hcd)) != 0) {
1798 dev_err(hcd->self.controller,
1799 "request interrupt %s failed\n", bufp);
8ec8d20b 1800 goto err_request_irq;
1da177e4
LT		 1801 }
1802 hcd->irq = irqnum;
1803 dev_info(hcd->self.controller, "irq %s, %s 0x%08llx\n", bufp,
1804 (hcd->driver->flags & HCD_MEMORY) ?
1805 "io mem" : "io base",
1806 (unsigned long long)hcd->rsrc_start);
1807 } else {
1808 hcd->irq = -1;
1809 if (hcd->rsrc_start)
1810 dev_info(hcd->self.controller, "%s 0x%08llx\n",
1811 (hcd->driver->flags & HCD_MEMORY) ?
1812 "io mem" : "io base",
1813 (unsigned long long)hcd->rsrc_start);
1814 }
1815
8ec8d20b
AS		 1816 /* Allocate the root hub before calling hcd->driver->start(),
1817 * but don't register it until afterward so that the hardware
1818 * is running.
1819 */
1820 if ((rhdev = usb_alloc_dev(NULL, &hcd->self, 0)) == NULL) {
1821 dev_err(hcd->self.controller, "unable to allocate root hub\n");
1822 retval = -ENOMEM;
1823 goto err_allocate_root_hub;
1824 }
1825 rhdev->speed = (hcd->driver->flags & HCD_USB2) ? USB_SPEED_HIGH :
1826 USB_SPEED_FULL;
1827
1828 /* Although in principle hcd->driver->start() might need to use rhdev,
1829 * none of the current drivers do.
1830 */
1da177e4
LT		 1831 if ((retval = hcd->driver->start(hcd)) < 0) {
1832 dev_err(hcd->self.controller, "startup error %d\n", retval);
8ec8d20b 1833 goto err_hcd_driver_start;
1da177e4
LT		 1834 }
1835
8ec8d20b
AS		 1836 /* hcd->driver->start() reported can_wakeup, probably with
1837 * assistance from board's boot firmware.
1838 * NOTE: normal devices won't enable wakeup by default.
1839 */
1840 if (hcd->can_wakeup)
1841 dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
1842 hcd->remote_wakeup = hcd->can_wakeup;
1843
1844 if ((retval = register_root_hub(rhdev, hcd)) != 0)
1845 goto err_register_root_hub;
1846
d5926ae7
AS		 1847 if (hcd->uses_new_polling && hcd->poll_rh)
1848 usb_hcd_poll_rh_status(hcd);
1da177e4
LT		 1849 return retval;
1850
8ec8d20b
AS		 1851 err_register_root_hub:
1852 hcd->driver->stop(hcd);
1853
1854 err_hcd_driver_start:
1855 usb_put_dev(rhdev);
1856
1857 err_allocate_root_hub:
1da177e4
LT		 1858 if (hcd->irq >= 0)
1859 free_irq(irqnum, hcd);
8ec8d20b
AS		 1860
1861 err_request_irq:
1da177e4 1862 usb_deregister_bus(&hcd->self);
8ec8d20b
AS		 1863
1864 err_register_bus:
1da177e4
LT		 1865 hcd_buffer_destroy(hcd);
1866 return retval;
1867}
1868EXPORT_SYMBOL (usb_add_hcd);
1869
1870/**
1871 * usb_remove_hcd - shutdown processing for generic HCDs
1872 * @hcd: the usb_hcd structure to remove
1873 * Context: !in_interrupt()
1874 *
1875 * Disconnects the root hub, then reverses the effects of usb_add_hcd(),
1876 * invoking the HCD's stop() method.
1877 */
1878void usb_remove_hcd(struct usb_hcd *hcd)
1879{
1880 dev_info(hcd->self.controller, "remove, state %x\n", hcd->state);
1881
1882 if (HC_IS_RUNNING (hcd->state))
1883 hcd->state = HC_STATE_QUIESCING;
1884
1885 dev_dbg(hcd->self.controller, "roothub graceful disconnect\n");
1886 spin_lock_irq (&hcd_root_hub_lock);
1887 hcd->rh_registered = 0;
1888 spin_unlock_irq (&hcd_root_hub_lock);
1889 usb_disconnect(&hcd->self.root_hub);
1890
d5926ae7
AS		 1891 hcd->poll_rh = 0;
1892 del_timer_sync(&hcd->rh_timer);
1893
1da177e4
LT		 1894 hcd->driver->stop(hcd);
1895 hcd->state = HC_STATE_HALT;
1896
1897 if (hcd->irq >= 0)
1898 free_irq(hcd->irq, hcd);
1899 usb_deregister_bus(&hcd->self);
1900 hcd_buffer_destroy(hcd);
1901}
1902EXPORT_SYMBOL (usb_remove_hcd);
1903
1904/*-------------------------------------------------------------------------*/
1905
4749f32d 1906#if defined(CONFIG_USB_MON)
1da177e4
LT		 1907
1908struct usb_mon_operations *mon_ops;
1909
1910/*
1911 * The registration is unlocked.
1912 * We do it this way because we do not want to lock in hot paths.
1913 *
1914 * Notice that the code is minimally error-proof. Because usbmon needs
1915 * symbols from usbcore, usbcore gets referenced and cannot be unloaded first.
1916 */
1917
1918int usb_mon_register (struct usb_mon_operations *ops)
1919{
1920
1921 if (mon_ops)
1922 return -EBUSY;
1923
1924 mon_ops = ops;
1925 mb();
1926 return 0;
1927}
1928EXPORT_SYMBOL_GPL (usb_mon_register);
1929
1930void usb_mon_deregister (void)
1931{
1932
1933 if (mon_ops == NULL) {
1934 printk(KERN_ERR "USB: monitor was not registered\n");
1935 return;
1936 }
1937 mon_ops = NULL;
1938 mb();
1939}
1940EXPORT_SYMBOL_GPL (usb_mon_deregister);
1941
1942#endif /* CONFIG_USB_MON */
kernel source for telekom puls (alcatel/mediatek)