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[SPARC64]: bp->pil can never be zero
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / core / hcd.c
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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>
4186ecf8 37#include <linux/mutex.h>
1da177e4
LT		 38#include <asm/irq.h>
39#include <asm/byteorder.h>
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 */
259 0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */
260 0x0c /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
261};
262
263/*-------------------------------------------------------------------------*/
264
265/*
266 * helper routine for returning string descriptors in UTF-16LE
267 * input can actually be ISO-8859-1; ASCII is its 7-bit subset
268 */
269static int ascii2utf (char *s, u8 *utf, int utfmax)
270{
271 int retval;
272
273 for (retval = 0; *s && utfmax > 1; utfmax -= 2, retval += 2) {
274 *utf++ = *s++;
275 *utf++ = 0;
276 }
277 if (utfmax > 0) {
278 *utf = *s;
279 ++retval;
280 }
281 return retval;
282}
283
284/*
285 * rh_string - provides manufacturer, product and serial strings for root hub
286 * @id: the string ID number (1: serial number, 2: product, 3: vendor)
287 * @hcd: the host controller for this root hub
288 * @type: string describing our driver
289 * @data: return packet in UTF-16 LE
290 * @len: length of the return packet
291 *
292 * Produces either a manufacturer, product or serial number string for the
293 * virtual root hub device.
294 */
295static int rh_string (
296 int id,
297 struct usb_hcd *hcd,
298 u8 *data,
299 int len
300) {
301 char buf [100];
302
303 // language ids
304 if (id == 0) {
305 buf[0] = 4; buf[1] = 3; /* 4 bytes string data */
306 buf[2] = 0x09; buf[3] = 0x04; /* MSFT-speak for "en-us" */
307 len = min (len, 4);
308 memcpy (data, buf, len);
309 return len;
310
311 // serial number
312 } else if (id == 1) {
313 strlcpy (buf, hcd->self.bus_name, sizeof buf);
314
315 // product description
316 } else if (id == 2) {
317 strlcpy (buf, hcd->product_desc, sizeof buf);
318
319 // id 3 == vendor description
320 } else if (id == 3) {
321 snprintf (buf, sizeof buf, "%s %s %s", system_utsname.sysname,
322 system_utsname.release, hcd->driver->description);
323
324 // unsupported IDs --> "protocol stall"
325 } else
326 return -EPIPE;
327
328 switch (len) { /* All cases fall through */
329 default:
330 len = 2 + ascii2utf (buf, data + 2, len - 2);
331 case 2:
332 data [1] = 3; /* type == string */
333 case 1:
334 data [0] = 2 * (strlen (buf) + 1);
335 case 0:
336 ; /* Compiler wants a statement here */
337 }
338 return len;
339}
340
341
342/* Root hub control transfers execute synchronously */
343static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
344{
345 struct usb_ctrlrequest *cmd;
346 u16 typeReq, wValue, wIndex, wLength;
347 u8 *ubuf = urb->transfer_buffer;
348 u8 tbuf [sizeof (struct usb_hub_descriptor)];
349 const u8 *bufp = tbuf;
350 int len = 0;
351 int patch_wakeup = 0;
352 unsigned long flags;
353 int status = 0;
354 int n;
355
356 cmd = (struct usb_ctrlrequest *) urb->setup_packet;
357 typeReq = (cmd->bRequestType << 8) | cmd->bRequest;
358 wValue = le16_to_cpu (cmd->wValue);
359 wIndex = le16_to_cpu (cmd->wIndex);
360 wLength = le16_to_cpu (cmd->wLength);
361
362 if (wLength > urb->transfer_buffer_length)
363 goto error;
364
365 urb->actual_length = 0;
366 switch (typeReq) {
367
368 /* DEVICE REQUESTS */
369
fb669cc0
DB		 370 /* The root hub's remote wakeup enable bit is implemented using
371 * driver model wakeup flags. If this system supports wakeup
372 * through USB, userspace may change the default "allow wakeup"
373 * policy through sysfs or these calls.
374 *
375 * Most root hubs support wakeup from downstream devices, for
376 * runtime power management (disabling USB clocks and reducing
377 * VBUS power usage). However, not all of them do so; silicon,
378 * board, and BIOS bugs here are not uncommon, so these can't
379 * be treated quite like external hubs.
380 *
381 * Likewise, not all root hubs will pass wakeup events upstream,
382 * to wake up the whole system. So don't assume root hub and
383 * controller capabilities are identical.
384 */
385
1da177e4 386 case DeviceRequest | USB_REQ_GET_STATUS:
fb669cc0
DB		 387 tbuf [0] = (device_may_wakeup(&hcd->self.root_hub->dev)
388 << USB_DEVICE_REMOTE_WAKEUP)
1da177e4
LT		 389 | (1 << USB_DEVICE_SELF_POWERED);
390 tbuf [1] = 0;
391 len = 2;
392 break;
393 case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
394 if (wValue == USB_DEVICE_REMOTE_WAKEUP)
fb669cc0 395 device_set_wakeup_enable(&hcd->self.root_hub->dev, 0);
1da177e4
LT		 396 else
397 goto error;
398 break;
399 case DeviceOutRequest | USB_REQ_SET_FEATURE:
fb669cc0
DB		 400 if (device_can_wakeup(&hcd->self.root_hub->dev)
401 && wValue == USB_DEVICE_REMOTE_WAKEUP)
402 device_set_wakeup_enable(&hcd->self.root_hub->dev, 1);
1da177e4
LT		 403 else
404 goto error;
405 break;
406 case DeviceRequest | USB_REQ_GET_CONFIGURATION:
407 tbuf [0] = 1;
408 len = 1;
409 /* FALLTHROUGH */
410 case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
411 break;
412 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
413 switch (wValue & 0xff00) {
414 case USB_DT_DEVICE << 8:
415 if (hcd->driver->flags & HCD_USB2)
416 bufp = usb2_rh_dev_descriptor;
417 else if (hcd->driver->flags & HCD_USB11)
418 bufp = usb11_rh_dev_descriptor;
419 else
420 goto error;
421 len = 18;
422 break;
423 case USB_DT_CONFIG << 8:
424 if (hcd->driver->flags & HCD_USB2) {
425 bufp = hs_rh_config_descriptor;
426 len = sizeof hs_rh_config_descriptor;
427 } else {
428 bufp = fs_rh_config_descriptor;
429 len = sizeof fs_rh_config_descriptor;
430 }
fb669cc0 431 if (device_can_wakeup(&hcd->self.root_hub->dev))
1da177e4
LT		 432 patch_wakeup = 1;
433 break;
434 case USB_DT_STRING << 8:
435 n = rh_string (wValue & 0xff, hcd, ubuf, wLength);
436 if (n < 0)
437 goto error;
438 urb->actual_length = n;
439 break;
440 default:
441 goto error;
442 }
443 break;
444 case DeviceRequest | USB_REQ_GET_INTERFACE:
445 tbuf [0] = 0;
446 len = 1;
447 /* FALLTHROUGH */
448 case DeviceOutRequest | USB_REQ_SET_INTERFACE:
449 break;
450 case DeviceOutRequest | USB_REQ_SET_ADDRESS:
451 // wValue == urb->dev->devaddr
452 dev_dbg (hcd->self.controller, "root hub device address %d\n",
453 wValue);
454 break;
455
456 /* INTERFACE REQUESTS (no defined feature/status flags) */
457
458 /* ENDPOINT REQUESTS */
459
460 case EndpointRequest | USB_REQ_GET_STATUS:
461 // ENDPOINT_HALT flag
462 tbuf [0] = 0;
463 tbuf [1] = 0;
464 len = 2;
465 /* FALLTHROUGH */
466 case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
467 case EndpointOutRequest | USB_REQ_SET_FEATURE:
468 dev_dbg (hcd->self.controller, "no endpoint features yet\n");
469 break;
470
471 /* CLASS REQUESTS (and errors) */
472
473 default:
474 /* non-generic request */
b13296c6
DB		 475 switch (typeReq) {
476 case GetHubStatus:
477 case GetPortStatus:
478 len = 4;
479 break;
480 case GetHubDescriptor:
481 len = sizeof (struct usb_hub_descriptor);
482 break;
1da177e4 483 }
b13296c6
DB		 484 status = hcd->driver->hub_control (hcd,
485 typeReq, wValue, wIndex,
486 tbuf, wLength);
1da177e4
LT		 487 break;
488error:
489 /* "protocol stall" on error */
490 status = -EPIPE;
491 }
492
493 if (status) {
494 len = 0;
495 if (status != -EPIPE) {
496 dev_dbg (hcd->self.controller,
497 "CTRL: TypeReq=0x%x val=0x%x "
498 "idx=0x%x len=%d ==> %d\n",
499 typeReq, wValue, wIndex,
b13296c6 500 wLength, status);
1da177e4
LT		 501 }
502 }
503 if (len) {
504 if (urb->transfer_buffer_length < len)
505 len = urb->transfer_buffer_length;
506 urb->actual_length = len;
507 // always USB_DIR_IN, toward host
508 memcpy (ubuf, bufp, len);
509
510 /* report whether RH hardware supports remote wakeup */
511 if (patch_wakeup &&
512 len > offsetof (struct usb_config_descriptor,
513 bmAttributes))
514 ((struct usb_config_descriptor *)ubuf)->bmAttributes
515 |= USB_CONFIG_ATT_WAKEUP;
516 }
517
518 /* any errors get returned through the urb completion */
519 local_irq_save (flags);
520 spin_lock (&urb->lock);
521 if (urb->status == -EINPROGRESS)
522 urb->status = status;
523 spin_unlock (&urb->lock);
524 usb_hcd_giveback_urb (hcd, urb, NULL);
525 local_irq_restore (flags);
526 return 0;
527}
528
529/*-------------------------------------------------------------------------*/
530
531/*
d5926ae7
AS		 532 * Root Hub interrupt transfers are polled using a timer if the
533 * driver requests it; otherwise the driver is responsible for
534 * calling usb_hcd_poll_rh_status() when an event occurs.
1da177e4 535 *
d5926ae7
AS		 536 * Completions are called in_interrupt(), but they may or may not
537 * be in_irq().
1da177e4 538 */
d5926ae7
AS		 539void usb_hcd_poll_rh_status(struct usb_hcd *hcd)
540{
541 struct urb *urb;
542 int length;
543 unsigned long flags;
544 char buffer[4]; /* Any root hubs with > 31 ports? */
1da177e4 545
d5926ae7
AS		 546 if (!hcd->uses_new_polling && !hcd->status_urb)
547 return;
1da177e4 548
d5926ae7
AS		 549 length = hcd->driver->hub_status_data(hcd, buffer);
550 if (length > 0) {
1da177e4 551
d5926ae7
AS		 552 /* try to complete the status urb */
553 local_irq_save (flags);
554 spin_lock(&hcd_root_hub_lock);
555 urb = hcd->status_urb;
556 if (urb) {
557 spin_lock(&urb->lock);
558 if (urb->status == -EINPROGRESS) {
559 hcd->poll_pending = 0;
560 hcd->status_urb = NULL;
561 urb->status = 0;
562 urb->hcpriv = NULL;
563 urb->actual_length = length;
564 memcpy(urb->transfer_buffer, buffer, length);
565 } else /* urb has been unlinked */
566 length = 0;
567 spin_unlock(&urb->lock);
568 } else
569 length = 0;
570 spin_unlock(&hcd_root_hub_lock);
571
572 /* local irqs are always blocked in completions */
573 if (length > 0)
574 usb_hcd_giveback_urb (hcd, urb, NULL);
575 else
576 hcd->poll_pending = 1;
577 local_irq_restore (flags);
1da177e4
LT		 578 }
579
d5926ae7
AS		 580 /* The USB 2.0 spec says 256 ms. This is close enough and won't
581 * exceed that limit if HZ is 100. */
582 if (hcd->uses_new_polling ? hcd->poll_rh :
583 (length == 0 && hcd->status_urb != NULL))
584 mod_timer (&hcd->rh_timer, jiffies + msecs_to_jiffies(250));
1da177e4 585}
d5926ae7 586EXPORT_SYMBOL_GPL(usb_hcd_poll_rh_status);
1da177e4
LT		 587
588/* timer callback */
d5926ae7
AS		 589static void rh_timer_func (unsigned long _hcd)
590{
591 usb_hcd_poll_rh_status((struct usb_hcd *) _hcd);
592}
593
594/*-------------------------------------------------------------------------*/
1da177e4 595
d5926ae7 596static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb)
1da177e4 597{
d5926ae7 598 int retval;
1da177e4 599 unsigned long flags;
d5926ae7 600 int len = 1 + (urb->dev->maxchild / 8);
1da177e4 601
d5926ae7
AS		 602 spin_lock_irqsave (&hcd_root_hub_lock, flags);
603 if (urb->status != -EINPROGRESS) /* already unlinked */
604 retval = urb->status;
605 else if (hcd->status_urb || urb->transfer_buffer_length < len) {
606 dev_dbg (hcd->self.controller, "not queuing rh status urb\n");
607 retval = -EINVAL;
608 } else {
609 hcd->status_urb = urb;
610 urb->hcpriv = hcd; /* indicate it's queued */
1da177e4 611
d5926ae7
AS		 612 if (!hcd->uses_new_polling)
613 mod_timer (&hcd->rh_timer, jiffies +
614 msecs_to_jiffies(250));
1da177e4 615
d5926ae7
AS		 616 /* If a status change has already occurred, report it ASAP */
617 else if (hcd->poll_pending)
618 mod_timer (&hcd->rh_timer, jiffies);
619 retval = 0;
1da177e4 620 }
d5926ae7
AS		 621 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
622 return retval;
1da177e4
LT		 623}
624
1da177e4
LT		 625static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb)
626{
d5926ae7
AS		 627 if (usb_pipeint (urb->pipe))
628 return rh_queue_status (hcd, urb);
1da177e4
LT		 629 if (usb_pipecontrol (urb->pipe))
630 return rh_call_control (hcd, urb);
d5926ae7 631 return -EINVAL;
1da177e4
LT		 632}
633
634/*-------------------------------------------------------------------------*/
635
d5926ae7
AS		 636/* Asynchronous unlinks of root-hub control URBs are legal, but they
637 * don't do anything. Status URB unlinks must be made in process context
638 * with interrupts enabled.
639 */
1da177e4
LT		 640static int usb_rh_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
641{
d5926ae7
AS		 642 if (usb_pipeendpoint(urb->pipe) == 0) { /* Control URB */
643 if (in_interrupt())
644 return 0; /* nothing to do */
1da177e4 645
1da177e4
LT		 646 spin_lock_irq(&urb->lock); /* from usb_kill_urb */
647 ++urb->reject;
648 spin_unlock_irq(&urb->lock);
649
650 wait_event(usb_kill_urb_queue,
651 atomic_read(&urb->use_count) == 0);
652
653 spin_lock_irq(&urb->lock);
654 --urb->reject;
655 spin_unlock_irq(&urb->lock);
d5926ae7
AS		 656
657 } else { /* Status URB */
658 if (!hcd->uses_new_polling)
659 del_timer_sync (&hcd->rh_timer);
660 local_irq_disable ();
661 spin_lock (&hcd_root_hub_lock);
662 if (urb == hcd->status_urb) {
663 hcd->status_urb = NULL;
664 urb->hcpriv = NULL;
665 } else
666 urb = NULL; /* wasn't fully queued */
667 spin_unlock (&hcd_root_hub_lock);
668 if (urb)
669 usb_hcd_giveback_urb (hcd, urb, NULL);
670 local_irq_enable ();
671 }
1da177e4
LT		 672
673 return 0;
674}
675
676/*-------------------------------------------------------------------------*/
677
678/* exported only within usbcore */
8561b10f 679struct usb_bus *usb_bus_get(struct usb_bus *bus)
1da177e4 680{
8561b10f
GKH		 681 if (bus)
682 kref_get(&bus->kref);
683 return bus;
684}
1da177e4 685
8561b10f
GKH		 686static void usb_host_release(struct kref *kref)
687{
688 struct usb_bus *bus = container_of(kref, struct usb_bus, kref);
1da177e4 689
8561b10f
GKH		 690 if (bus->release)
691 bus->release(bus);
1da177e4
LT		 692}
693
694/* exported only within usbcore */
8561b10f 695void usb_bus_put(struct usb_bus *bus)
1da177e4
LT		 696{
697 if (bus)
8561b10f 698 kref_put(&bus->kref, usb_host_release);
1da177e4
LT		 699}
700
701/*-------------------------------------------------------------------------*/
702
8561b10f 703static struct class *usb_host_class;
1da177e4
LT		 704
705int usb_host_init(void)
706{
8561b10f
GKH		 707 int retval = 0;
708
709 usb_host_class = class_create(THIS_MODULE, "usb_host");
710 if (IS_ERR(usb_host_class))
711 retval = PTR_ERR(usb_host_class);
712 return retval;
1da177e4
LT		 713}
714
715void usb_host_cleanup(void)
716{
8561b10f 717 class_destroy(usb_host_class);
1da177e4
LT		 718}
719
720/**
721 * usb_bus_init - shared initialization code
722 * @bus: the bus structure being initialized
723 *
724 * This code is used to initialize a usb_bus structure, memory for which is
725 * separately managed.
726 */
727static void usb_bus_init (struct usb_bus *bus)
728{
729 memset (&bus->devmap, 0, sizeof(struct usb_devmap));
730
731 bus->devnum_next = 1;
732
733 bus->root_hub = NULL;
734 bus->hcpriv = NULL;
735 bus->busnum = -1;
736 bus->bandwidth_allocated = 0;
737 bus->bandwidth_int_reqs = 0;
738 bus->bandwidth_isoc_reqs = 0;
739
740 INIT_LIST_HEAD (&bus->bus_list);
741
8561b10f 742 kref_init(&bus->kref);
1da177e4
LT		 743}
744
745/**
746 * usb_alloc_bus - creates a new USB host controller structure
747 * @op: pointer to a struct usb_operations that this bus structure should use
748 * Context: !in_interrupt()
749 *
750 * Creates a USB host controller bus structure with the specified
751 * usb_operations and initializes all the necessary internal objects.
752 *
753 * If no memory is available, NULL is returned.
754 *
755 * The caller should call usb_put_bus() when it is finished with the structure.
756 */
757struct usb_bus *usb_alloc_bus (struct usb_operations *op)
758{
759 struct usb_bus *bus;
760
0a1ef3b5 761 bus = kzalloc (sizeof *bus, GFP_KERNEL);
1da177e4
LT		 762 if (!bus)
763 return NULL;
1da177e4
LT		 764 usb_bus_init (bus);
765 bus->op = op;
766 return bus;
767}
768
769/*-------------------------------------------------------------------------*/
770
771/**
772 * usb_register_bus - registers the USB host controller with the usb core
773 * @bus: pointer to the bus to register
774 * Context: !in_interrupt()
775 *
776 * Assigns a bus number, and links the controller into usbcore data
777 * structures so that it can be seen by scanning the bus list.
778 */
779static int usb_register_bus(struct usb_bus *bus)
780{
781 int busnum;
1da177e4 782
4186ecf8 783 mutex_lock(&usb_bus_list_lock);
1da177e4
LT		 784 busnum = find_next_zero_bit (busmap.busmap, USB_MAXBUS, 1);
785 if (busnum < USB_MAXBUS) {
786 set_bit (busnum, busmap.busmap);
787 bus->busnum = busnum;
788 } else {
789 printk (KERN_ERR "%s: too many buses\n", usbcore_name);
4186ecf8 790 mutex_unlock(&usb_bus_list_lock);
1da177e4
LT		 791 return -E2BIG;
792 }
793
53f46542
GKH		 794 bus->class_dev = class_device_create(usb_host_class, NULL, MKDEV(0,0),
795 bus->controller, "usb_host%d", busnum);
8561b10f 796 if (IS_ERR(bus->class_dev)) {
1da177e4 797 clear_bit(busnum, busmap.busmap);
4186ecf8 798 mutex_unlock(&usb_bus_list_lock);
8561b10f 799 return PTR_ERR(bus->class_dev);
1da177e4
LT		 800 }
801
8561b10f
GKH		 802 class_set_devdata(bus->class_dev, bus);
803
1da177e4
LT		 804 /* Add it to the local list of buses */
805 list_add (&bus->bus_list, &usb_bus_list);
4186ecf8 806 mutex_unlock(&usb_bus_list_lock);
1da177e4 807
3099e75a 808 usb_notify_add_bus(bus);
1da177e4
LT		 809
810 dev_info (bus->controller, "new USB bus registered, assigned bus number %d\n", bus->busnum);
811 return 0;
812}
813
814/**
815 * usb_deregister_bus - deregisters the USB host controller
816 * @bus: pointer to the bus to deregister
817 * Context: !in_interrupt()
818 *
819 * Recycles the bus number, and unlinks the controller from usbcore data
820 * structures so that it won't be seen by scanning the bus list.
821 */
822static void usb_deregister_bus (struct usb_bus *bus)
823{
824 dev_info (bus->controller, "USB bus %d deregistered\n", bus->busnum);
825
826 /*
827 * NOTE: make sure that all the devices are removed by the
828 * controller code, as well as having it call this when cleaning
829 * itself up
830 */
4186ecf8 831 mutex_lock(&usb_bus_list_lock);
1da177e4 832 list_del (&bus->bus_list);
4186ecf8 833 mutex_unlock(&usb_bus_list_lock);
1da177e4 834
3099e75a 835 usb_notify_remove_bus(bus);
1da177e4
LT		 836
837 clear_bit (bus->busnum, busmap.busmap);
838
8561b10f 839 class_device_unregister(bus->class_dev);
1da177e4
LT		 840}
841
842/**
8ec8d20b 843 * register_root_hub - called by usb_add_hcd() to register a root hub
1da177e4
LT		 844 * @hcd: host controller for this root hub
845 *
8ec8d20b 846 * This function registers the root hub with the USB subsystem. It sets up
b1e8f0a6
DB		 847 * the device properly in the device tree and then calls usb_new_device()
848 * to register the usb device. It also assigns the root hub's USB address
849 * (always 1).
1da177e4 850 */
b1e8f0a6 851static int register_root_hub(struct usb_hcd *hcd)
1da177e4
LT		 852{
853 struct device *parent_dev = hcd->self.controller;
b1e8f0a6 854 struct usb_device *usb_dev = hcd->self.root_hub;
1da177e4
LT		 855 const int devnum = 1;
856 int retval;
857
1da177e4
LT		 858 usb_dev->devnum = devnum;
859 usb_dev->bus->devnum_next = devnum + 1;
860 memset (&usb_dev->bus->devmap.devicemap, 0,
861 sizeof usb_dev->bus->devmap.devicemap);
862 set_bit (devnum, usb_dev->bus->devmap.devicemap);
863 usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
864
4186ecf8 865 mutex_lock(&usb_bus_list_lock);
1da177e4
LT		 866
867 usb_dev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
868 retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE);
869 if (retval != sizeof usb_dev->descriptor) {
4186ecf8 870 mutex_unlock(&usb_bus_list_lock);
1da177e4
LT		 871 dev_dbg (parent_dev, "can't read %s device descriptor %d\n",
872 usb_dev->dev.bus_id, retval);
873 return (retval < 0) ? retval : -EMSGSIZE;
874 }
875
1da177e4 876 retval = usb_new_device (usb_dev);
1da177e4 877 if (retval) {
1da177e4
LT		 878 dev_err (parent_dev, "can't register root hub for %s, %d\n",
879 usb_dev->dev.bus_id, retval);
880 }
4186ecf8 881 mutex_unlock(&usb_bus_list_lock);
1da177e4
LT		 882
883 if (retval == 0) {
884 spin_lock_irq (&hcd_root_hub_lock);
885 hcd->rh_registered = 1;
886 spin_unlock_irq (&hcd_root_hub_lock);
887
888 /* Did the HC die before the root hub was registered? */
889 if (hcd->state == HC_STATE_HALT)
890 usb_hc_died (hcd); /* This time clean up */
891 }
892
893 return retval;
894}
1da177e4 895
d5926ae7
AS		 896void usb_enable_root_hub_irq (struct usb_bus *bus)
897{
898 struct usb_hcd *hcd;
899
900 hcd = container_of (bus, struct usb_hcd, self);
901 if (hcd->driver->hub_irq_enable && !hcd->poll_rh &&
902 hcd->state != HC_STATE_HALT)
903 hcd->driver->hub_irq_enable (hcd);
904}
905
1da177e4
LT		 906
907/*-------------------------------------------------------------------------*/
908
909/**
910 * usb_calc_bus_time - approximate periodic transaction time in nanoseconds
911 * @speed: from dev->speed; USB_SPEED_{LOW,FULL,HIGH}
912 * @is_input: true iff the transaction sends data to the host
913 * @isoc: true for isochronous transactions, false for interrupt ones
914 * @bytecount: how many bytes in the transaction.
915 *
916 * Returns approximate bus time in nanoseconds for a periodic transaction.
917 * See USB 2.0 spec section 5.11.3; only periodic transfers need to be
918 * scheduled in software, this function is only used for such scheduling.
919 */
920long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount)
921{
922 unsigned long tmp;
923
924 switch (speed) {
925 case USB_SPEED_LOW: /* INTR only */
926 if (is_input) {
927 tmp = (67667L * (31L + 10L * BitTime (bytecount))) / 1000L;
928 return (64060L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
929 } else {
930 tmp = (66700L * (31L + 10L * BitTime (bytecount))) / 1000L;
931 return (64107L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
932 }
933 case USB_SPEED_FULL: /* ISOC or INTR */
934 if (isoc) {
935 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
936 return (((is_input) ? 7268L : 6265L) + BW_HOST_DELAY + tmp);
937 } else {
938 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
939 return (9107L + BW_HOST_DELAY + tmp);
940 }
941 case USB_SPEED_HIGH: /* ISOC or INTR */
942 // FIXME adjust for input vs output
943 if (isoc)
498f78e6 944 tmp = HS_NSECS_ISO (bytecount);
1da177e4 945 else
498f78e6 946 tmp = HS_NSECS (bytecount);
1da177e4
LT		 947 return tmp;
948 default:
949 pr_debug ("%s: bogus device speed!\n", usbcore_name);
950 return -1;
951 }
952}
953EXPORT_SYMBOL (usb_calc_bus_time);
954
955/*
956 * usb_check_bandwidth():
957 *
958 * old_alloc is from host_controller->bandwidth_allocated in microseconds;
959 * bustime is from calc_bus_time(), but converted to microseconds.
960 *
961 * returns <bustime in us> if successful,
962 * or -ENOSPC if bandwidth request fails.
963 *
964 * FIXME:
965 * This initial implementation does not use Endpoint.bInterval
966 * in managing bandwidth allocation.
967 * It probably needs to be expanded to use Endpoint.bInterval.
968 * This can be done as a later enhancement (correction).
969 *
970 * This will also probably require some kind of
971 * frame allocation tracking...meaning, for example,
972 * that if multiple drivers request interrupts every 10 USB frames,
973 * they don't all have to be allocated at
974 * frame numbers N, N+10, N+20, etc. Some of them could be at
975 * N+11, N+21, N+31, etc., and others at
976 * N+12, N+22, N+32, etc.
977 *
978 * Similarly for isochronous transfers...
979 *
980 * Individual HCDs can schedule more directly ... this logic
981 * is not correct for high speed transfers.
982 */
983int usb_check_bandwidth (struct usb_device *dev, struct urb *urb)
984{
985 unsigned int pipe = urb->pipe;
986 long bustime;
987 int is_in = usb_pipein (pipe);
988 int is_iso = usb_pipeisoc (pipe);
989 int old_alloc = dev->bus->bandwidth_allocated;
990 int new_alloc;
991
992
993 bustime = NS_TO_US (usb_calc_bus_time (dev->speed, is_in, is_iso,
994 usb_maxpacket (dev, pipe, !is_in)));
995 if (is_iso)
996 bustime /= urb->number_of_packets;
997
998 new_alloc = old_alloc + (int) bustime;
999 if (new_alloc > FRAME_TIME_MAX_USECS_ALLOC) {
1000#ifdef DEBUG
1001 char *mode =
1002#ifdef CONFIG_USB_BANDWIDTH
1003 "";
1004#else
1005 "would have ";
1006#endif
1007 dev_dbg (&dev->dev, "usb_check_bandwidth %sFAILED: %d + %ld = %d usec\n",
1008 mode, old_alloc, bustime, new_alloc);
1009#endif
1010#ifdef CONFIG_USB_BANDWIDTH
1011 bustime = -ENOSPC; /* report error */
1012#endif
1013 }
1014
1015 return bustime;
1016}
1017EXPORT_SYMBOL (usb_check_bandwidth);
1018
1019
1020/**
1021 * usb_claim_bandwidth - records bandwidth for a periodic transfer
1022 * @dev: source/target of request
1023 * @urb: request (urb->dev == dev)
1024 * @bustime: bandwidth consumed, in (average) microseconds per frame
1025 * @isoc: true iff the request is isochronous
1026 *
1027 * Bus bandwidth reservations are recorded purely for diagnostic purposes.
1028 * HCDs are expected not to overcommit periodic bandwidth, and to record such
1029 * reservations whenever endpoints are added to the periodic schedule.
1030 *
1031 * FIXME averaging per-frame is suboptimal. Better to sum over the HCD's
1032 * entire periodic schedule ... 32 frames for OHCI, 1024 for UHCI, settable
1033 * for EHCI (256/512/1024 frames, default 1024) and have the bus expose how
1034 * large its periodic schedule is.
1035 */
1036void usb_claim_bandwidth (struct usb_device *dev, struct urb *urb, int bustime, int isoc)
1037{
1038 dev->bus->bandwidth_allocated += bustime;
1039 if (isoc)
1040 dev->bus->bandwidth_isoc_reqs++;
1041 else
1042 dev->bus->bandwidth_int_reqs++;
1043 urb->bandwidth = bustime;
1044
1045#ifdef USB_BANDWIDTH_MESSAGES
1046 dev_dbg (&dev->dev, "bandwidth alloc increased by %d (%s) to %d for %d requesters\n",
1047 bustime,
1048 isoc ? "ISOC" : "INTR",
1049 dev->bus->bandwidth_allocated,
1050 dev->bus->bandwidth_int_reqs + dev->bus->bandwidth_isoc_reqs);
1051#endif
1052}
1053EXPORT_SYMBOL (usb_claim_bandwidth);
1054
1055
1056/**
1057 * usb_release_bandwidth - reverses effect of usb_claim_bandwidth()
1058 * @dev: source/target of request
1059 * @urb: request (urb->dev == dev)
1060 * @isoc: true iff the request is isochronous
1061 *
1062 * This records that previously allocated bandwidth has been released.
1063 * Bandwidth is released when endpoints are removed from the host controller's
1064 * periodic schedule.
1065 */
1066void usb_release_bandwidth (struct usb_device *dev, struct urb *urb, int isoc)
1067{
1068 dev->bus->bandwidth_allocated -= urb->bandwidth;
1069 if (isoc)
1070 dev->bus->bandwidth_isoc_reqs--;
1071 else
1072 dev->bus->bandwidth_int_reqs--;
1073
1074#ifdef USB_BANDWIDTH_MESSAGES
1075 dev_dbg (&dev->dev, "bandwidth alloc reduced by %d (%s) to %d for %d requesters\n",
1076 urb->bandwidth,
1077 isoc ? "ISOC" : "INTR",
1078 dev->bus->bandwidth_allocated,
1079 dev->bus->bandwidth_int_reqs + dev->bus->bandwidth_isoc_reqs);
1080#endif
1081 urb->bandwidth = 0;
1082}
1083EXPORT_SYMBOL (usb_release_bandwidth);
1084
1085
1086/*-------------------------------------------------------------------------*/
1087
1088/*
1089 * Generic HC operations.
1090 */
1091
1092/*-------------------------------------------------------------------------*/
1093
1094static void urb_unlink (struct urb *urb)
1095{
1096 unsigned long flags;
1097
1098 /* Release any periodic transfer bandwidth */
1099 if (urb->bandwidth)
1100 usb_release_bandwidth (urb->dev, urb,
1101 usb_pipeisoc (urb->pipe));
1102
1103 /* clear all state linking urb to this dev (and hcd) */
1104
1105 spin_lock_irqsave (&hcd_data_lock, flags);
1106 list_del_init (&urb->urb_list);
1107 spin_unlock_irqrestore (&hcd_data_lock, flags);
1da177e4
LT		 1108}
1109
1110
1111/* may be called in any context with a valid urb->dev usecount
1112 * caller surrenders "ownership" of urb
1113 * expects usb_submit_urb() to have sanity checked and conditioned all
1114 * inputs in the urb
1115 */
55016f10 1116static int hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
1da177e4
LT		 1117{
1118 int status;
1119 struct usb_hcd *hcd = urb->dev->bus->hcpriv;
1120 struct usb_host_endpoint *ep;
1121 unsigned long flags;
1122
1123 if (!hcd)
1124 return -ENODEV;
1125
1126 usbmon_urb_submit(&hcd->self, urb);
1127
1128 /*
1129 * Atomically queue the urb, first to our records, then to the HCD.
1130 * Access to urb->status is controlled by urb->lock ... changes on
1131 * i/o completion (normal or fault) or unlinking.
1132 */
1133
1134 // FIXME: verify that quiescing hc works right (RH cleans up)
1135
1136 spin_lock_irqsave (&hcd_data_lock, flags);
1137 ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out)
1138 [usb_pipeendpoint(urb->pipe)];
1139 if (unlikely (!ep))
1140 status = -ENOENT;
1141 else if (unlikely (urb->reject))
1142 status = -EPERM;
1143 else switch (hcd->state) {
1144 case HC_STATE_RUNNING:
1145 case HC_STATE_RESUMING:
979d5199 1146doit:
1da177e4
LT		 1147 list_add_tail (&urb->urb_list, &ep->urb_list);
1148 status = 0;
1149 break;
979d5199
DB		 1150 case HC_STATE_SUSPENDED:
1151 /* HC upstream links (register access, wakeup signaling) can work
1152 * even when the downstream links (and DMA etc) are quiesced; let
1153 * usbcore talk to the root hub.
1154 */
1155 if (hcd->self.controller->power.power_state.event == PM_EVENT_ON
1156 && urb->dev->parent == NULL)
1157 goto doit;
1158 /* FALL THROUGH */
1da177e4
LT		 1159 default:
1160 status = -ESHUTDOWN;
1161 break;
1162 }
1163 spin_unlock_irqrestore (&hcd_data_lock, flags);
1164 if (status) {
1165 INIT_LIST_HEAD (&urb->urb_list);
1166 usbmon_urb_submit_error(&hcd->self, urb, status);
1167 return status;
1168 }
1169
1170 /* increment urb's reference count as part of giving it to the HCD
1171 * (which now controls it). HCD guarantees that it either returns
1172 * an error or calls giveback(), but not both.
1173 */
1174 urb = usb_get_urb (urb);
1175 atomic_inc (&urb->use_count);
1176
1177 if (urb->dev == hcd->self.root_hub) {
1178 /* NOTE: requirement on hub callers (usbfs and the hub
1179 * driver, for now) that URBs' urb->transfer_buffer be
1180 * valid and usb_buffer_{sync,unmap}() not be needed, since
1181 * they could clobber root hub response data.
1182 */
1183 status = rh_urb_enqueue (hcd, urb);
1184 goto done;
1185 }
1186
1187 /* lower level hcd code should use *_dma exclusively,
1188 * unless it uses pio or talks to another transport.
1189 */
1190 if (hcd->self.controller->dma_mask) {
1191 if (usb_pipecontrol (urb->pipe)
1192 && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
1193 urb->setup_dma = dma_map_single (
1194 hcd->self.controller,
1195 urb->setup_packet,
1196 sizeof (struct usb_ctrlrequest),
1197 DMA_TO_DEVICE);
1198 if (urb->transfer_buffer_length != 0
1199 && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP))
1200 urb->transfer_dma = dma_map_single (
1201 hcd->self.controller,
1202 urb->transfer_buffer,
1203 urb->transfer_buffer_length,
1204 usb_pipein (urb->pipe)
1205 ? DMA_FROM_DEVICE
1206 : DMA_TO_DEVICE);
1207 }
1208
1209 status = hcd->driver->urb_enqueue (hcd, ep, urb, mem_flags);
1210done:
1211 if (unlikely (status)) {
1212 urb_unlink (urb);
1213 atomic_dec (&urb->use_count);
1214 if (urb->reject)
1215 wake_up (&usb_kill_urb_queue);
1216 usb_put_urb (urb);
1217 usbmon_urb_submit_error(&hcd->self, urb, status);
1218 }
1219 return status;
1220}
1221
1222/*-------------------------------------------------------------------------*/
1223
1224/* called in any context */
1225static int hcd_get_frame_number (struct usb_device *udev)
1226{
1227 struct usb_hcd *hcd = (struct usb_hcd *)udev->bus->hcpriv;
1228 if (!HC_IS_RUNNING (hcd->state))
1229 return -ESHUTDOWN;
1230 return hcd->driver->get_frame_number (hcd);
1231}
1232
1233/*-------------------------------------------------------------------------*/
1234
1235/* this makes the hcd giveback() the urb more quickly, by kicking it
1236 * off hardware queues (which may take a while) and returning it as
1237 * soon as practical. we've already set up the urb's return status,
1238 * but we can't know if the callback completed already.
1239 */
1240static int
1241unlink1 (struct usb_hcd *hcd, struct urb *urb)
1242{
1243 int value;
1244
1245 if (urb->dev == hcd->self.root_hub)
1246 value = usb_rh_urb_dequeue (hcd, urb);
1247 else {
1248
1249 /* The only reason an HCD might fail this call is if
1250 * it has not yet fully queued the urb to begin with.
1251 * Such failures should be harmless. */
1252 value = hcd->driver->urb_dequeue (hcd, urb);
1253 }
1254
1255 if (value != 0)
1256 dev_dbg (hcd->self.controller, "dequeue %p --> %d\n",
1257 urb, value);
1258 return value;
1259}
1260
1261/*
1262 * called in any context
1263 *
1264 * caller guarantees urb won't be recycled till both unlink()
1265 * and the urb's completion function return
1266 */
1267static int hcd_unlink_urb (struct urb *urb, int status)
1268{
1269 struct usb_host_endpoint *ep;
1270 struct usb_hcd *hcd = NULL;
1271 struct device *sys = NULL;
1272 unsigned long flags;
1273 struct list_head *tmp;
1274 int retval;
1275
1276 if (!urb)
1277 return -EINVAL;
1278 if (!urb->dev || !urb->dev->bus)
1279 return -ENODEV;
1280 ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out)
1281 [usb_pipeendpoint(urb->pipe)];
1282 if (!ep)
1283 return -ENODEV;
1284
1285 /*
1286 * we contend for urb->status with the hcd core,
1287 * which changes it while returning the urb.
1288 *
1289 * Caller guaranteed that the urb pointer hasn't been freed, and
1290 * that it was submitted. But as a rule it can't know whether or
1291 * not it's already been unlinked ... so we respect the reversed
1292 * lock sequence needed for the usb_hcd_giveback_urb() code paths
1293 * (urb lock, then hcd_data_lock) in case some other CPU is now
1294 * unlinking it.
1295 */
1296 spin_lock_irqsave (&urb->lock, flags);
1297 spin_lock (&hcd_data_lock);
1298
1299 sys = &urb->dev->dev;
1300 hcd = urb->dev->bus->hcpriv;
1301 if (hcd == NULL) {
1302 retval = -ENODEV;
1303 goto done;
1304 }
1305
1da177e4
LT		 1306 /* insist the urb is still queued */
1307 list_for_each(tmp, &ep->urb_list) {
1308 if (tmp == &urb->urb_list)
1309 break;
1310 }
1311 if (tmp != &urb->urb_list) {
1312 retval = -EIDRM;
1313 goto done;
1314 }
1315
1316 /* Any status except -EINPROGRESS means something already started to
1317 * unlink this URB from the hardware. So there's no more work to do.
1318 */
1319 if (urb->status != -EINPROGRESS) {
1320 retval = -EBUSY;
1321 goto done;
1322 }
1323
1324 /* IRQ setup can easily be broken so that USB controllers
1325 * never get completion IRQs ... maybe even the ones we need to
1326 * finish unlinking the initial failed usb_set_address()
1327 * or device descriptor fetch.
1328 */
8de98402
BH		 1329 if (!test_bit(HCD_FLAG_SAW_IRQ, &hcd->flags)
1330 && hcd->self.root_hub != urb->dev) {
1da177e4
LT		 1331 dev_warn (hcd->self.controller, "Unlink after no-IRQ? "
1332 "Controller is probably using the wrong IRQ."
1333 "\n");
8de98402 1334 set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
1da177e4
LT		 1335 }
1336
1337 urb->status = status;
1338
1339 spin_unlock (&hcd_data_lock);
1340 spin_unlock_irqrestore (&urb->lock, flags);
1341
1342 retval = unlink1 (hcd, urb);
1343 if (retval == 0)
1344 retval = -EINPROGRESS;
1345 return retval;
1346
1347done:
1348 spin_unlock (&hcd_data_lock);
1349 spin_unlock_irqrestore (&urb->lock, flags);
1350 if (retval != -EIDRM && sys && sys->driver)
1351 dev_dbg (sys, "hcd_unlink_urb %p fail %d\n", urb, retval);
1352 return retval;
1353}
1354
1355/*-------------------------------------------------------------------------*/
1356
1357/* disables the endpoint: cancels any pending urbs, then synchronizes with
1358 * the hcd to make sure all endpoint state is gone from hardware. use for
1359 * set_configuration, set_interface, driver removal, physical disconnect.
1360 *
1361 * example: a qh stored in ep->hcpriv, holding state related to endpoint
1362 * type, maxpacket size, toggle, halt status, and scheduling.
1363 */
1364static void
1365hcd_endpoint_disable (struct usb_device *udev, struct usb_host_endpoint *ep)
1366{
1367 struct usb_hcd *hcd;
1368 struct urb *urb;
1369
1370 hcd = udev->bus->hcpriv;
1371
d5926ae7
AS		 1372 WARN_ON (!HC_IS_RUNNING (hcd->state) && hcd->state != HC_STATE_HALT &&
1373 udev->state != USB_STATE_NOTATTACHED);
1da177e4
LT		 1374
1375 local_irq_disable ();
1376
1377 /* FIXME move most of this into message.c as part of its
1378 * endpoint disable logic
1379 */
1380
1381 /* ep is already gone from udev->ep_{in,out}[]; no more submits */
1382rescan:
1383 spin_lock (&hcd_data_lock);
1384 list_for_each_entry (urb, &ep->urb_list, urb_list) {
1385 int tmp;
1386
1387 /* another cpu may be in hcd, spinning on hcd_data_lock
1388 * to giveback() this urb. the races here should be
1389 * small, but a full fix needs a new "can't submit"
1390 * urb state.
1391 * FIXME urb->reject should allow that...
1392 */
1393 if (urb->status != -EINPROGRESS)
1394 continue;
1395 usb_get_urb (urb);
1396 spin_unlock (&hcd_data_lock);
1397
1398 spin_lock (&urb->lock);
1399 tmp = urb->status;
1400 if (tmp == -EINPROGRESS)
1401 urb->status = -ESHUTDOWN;
1402 spin_unlock (&urb->lock);
1403
1404 /* kick hcd unless it's already returning this */
1405 if (tmp == -EINPROGRESS) {
1406 tmp = urb->pipe;
1407 unlink1 (hcd, urb);
1408 dev_dbg (hcd->self.controller,
1409 "shutdown urb %p pipe %08x ep%d%s%s\n",
1410 urb, tmp, usb_pipeendpoint (tmp),
1411 (tmp & USB_DIR_IN) ? "in" : "out",
1412 ({ char *s; \
1413 switch (usb_pipetype (tmp)) { \
1414 case PIPE_CONTROL: s = ""; break; \
1415 case PIPE_BULK: s = "-bulk"; break; \
1416 case PIPE_INTERRUPT: s = "-intr"; break; \
1417 default: s = "-iso"; break; \
1418 }; s;}));
1419 }
1420 usb_put_urb (urb);
1421
1422 /* list contents may have changed */
1423 goto rescan;
1424 }
1425 spin_unlock (&hcd_data_lock);
1426 local_irq_enable ();
1427
1428 /* synchronize with the hardware, so old configuration state
1429 * clears out immediately (and will be freed).
1430 */
1431 might_sleep ();
1432 if (hcd->driver->endpoint_disable)
1433 hcd->driver->endpoint_disable (hcd, ep);
1434}
1435
1436/*-------------------------------------------------------------------------*/
1437
9293677a 1438#ifdef CONFIG_PM
1da177e4 1439
0c0382e3 1440int hcd_bus_suspend (struct usb_bus *bus)
1da177e4
LT		 1441{
1442 struct usb_hcd *hcd;
9293677a 1443 int status;
1da177e4
LT		 1444
1445 hcd = container_of (bus, struct usb_hcd, self);
0c0382e3 1446 if (!hcd->driver->bus_suspend)
9293677a
DB		 1447 return -ENOENT;
1448 hcd->state = HC_STATE_QUIESCING;
0c0382e3 1449 status = hcd->driver->bus_suspend (hcd);
9293677a
DB		 1450 if (status == 0)
1451 hcd->state = HC_STATE_SUSPENDED;
1452 else
1453 dev_dbg(&bus->root_hub->dev, "%s fail, err %d\n",
1454 "suspend", status);
1455 return status;
1da177e4
LT		 1456}
1457
0c0382e3 1458int hcd_bus_resume (struct usb_bus *bus)
1da177e4
LT		 1459{
1460 struct usb_hcd *hcd;
9293677a 1461 int status;
1da177e4
LT		 1462
1463 hcd = container_of (bus, struct usb_hcd, self);
0c0382e3 1464 if (!hcd->driver->bus_resume)
9293677a 1465 return -ENOENT;
979d5199
DB		 1466 if (hcd->state == HC_STATE_RUNNING)
1467 return 0;
9293677a 1468 hcd->state = HC_STATE_RESUMING;
0c0382e3 1469 status = hcd->driver->bus_resume (hcd);
9293677a
DB		 1470 if (status == 0)
1471 hcd->state = HC_STATE_RUNNING;
1472 else {
1473 dev_dbg(&bus->root_hub->dev, "%s fail, err %d\n",
1474 "resume", status);
1475 usb_hc_died(hcd);
1476 }
1477 return status;
1da177e4
LT		 1478}
1479
979d5199
DB		 1480/*
1481 * usb_hcd_suspend_root_hub - HCD autosuspends downstream ports
1482 * @hcd: host controller for this root hub
1483 *
1484 * This call arranges that usb_hcd_resume_root_hub() is safe to call later;
1485 * that the HCD's root hub polling is deactivated; and that the root's hub
1486 * driver is suspended. HCDs may call this to autosuspend when their root
1487 * hub's downstream ports are all inactive: unpowered, disconnected,
1488 * disabled, or suspended.
1489 *
1490 * The HCD will autoresume on device connect change detection (using SRP
1491 * or a D+/D- pullup). The HCD also autoresumes on remote wakeup signaling
1492 * from any ports that are suspended (if that is enabled). In most cases,
1493 * overcurrent signaling (on powered ports) will also start autoresume.
1494 *
1495 * Always called with IRQs blocked.
1496 */
1497void usb_hcd_suspend_root_hub (struct usb_hcd *hcd)
1498{
1499 struct urb *urb;
1500
1501 spin_lock (&hcd_root_hub_lock);
1502 usb_suspend_root_hub (hcd->self.root_hub);
1503
1504 /* force status urb to complete/unlink while suspended */
1505 if (hcd->status_urb) {
1506 urb = hcd->status_urb;
1507 urb->status = -ECONNRESET;
1508 urb->hcpriv = NULL;
1509 urb->actual_length = 0;
1510
1511 del_timer (&hcd->rh_timer);
1512 hcd->poll_pending = 0;
1513 hcd->status_urb = NULL;
1514 } else
1515 urb = NULL;
1516 spin_unlock (&hcd_root_hub_lock);
1517 hcd->state = HC_STATE_SUSPENDED;
1518
1519 if (urb)
1520 usb_hcd_giveback_urb (hcd, urb, NULL);
1521}
1522EXPORT_SYMBOL_GPL(usb_hcd_suspend_root_hub);
1523
1da177e4
LT		 1524/**
1525 * usb_hcd_resume_root_hub - called by HCD to resume its root hub
1526 * @hcd: host controller for this root hub
1527 *
1528 * The USB host controller calls this function when its root hub is
1529 * suspended (with the remote wakeup feature enabled) and a remote
1530 * wakeup request is received. It queues a request for khubd to
979d5199 1531 * resume the root hub (that is, manage its downstream ports again).
1da177e4
LT		 1532 */
1533void usb_hcd_resume_root_hub (struct usb_hcd *hcd)
1534{
1535 unsigned long flags;
1536
1537 spin_lock_irqsave (&hcd_root_hub_lock, flags);
1538 if (hcd->rh_registered)
1539 usb_resume_root_hub (hcd->self.root_hub);
1540 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
1541}
9293677a 1542EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub);
1da177e4 1543
1da177e4 1544#endif
1da177e4
LT		 1545
1546/*-------------------------------------------------------------------------*/
1547
1548#ifdef CONFIG_USB_OTG
1549
1550/**
1551 * usb_bus_start_enum - start immediate enumeration (for OTG)
1552 * @bus: the bus (must use hcd framework)
1553 * @port_num: 1-based number of port; usually bus->otg_port
1554 * Context: in_interrupt()
1555 *
1556 * Starts enumeration, with an immediate reset followed later by
1557 * khubd identifying and possibly configuring the device.
1558 * This is needed by OTG controller drivers, where it helps meet
1559 * HNP protocol timing requirements for starting a port reset.
1560 */
1561int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num)
1562{
1563 struct usb_hcd *hcd;
1564 int status = -EOPNOTSUPP;
1565
1566 /* NOTE: since HNP can't start by grabbing the bus's address0_sem,
1567 * boards with root hubs hooked up to internal devices (instead of
1568 * just the OTG port) may need more attention to resetting...
1569 */
1570 hcd = container_of (bus, struct usb_hcd, self);
1571 if (port_num && hcd->driver->start_port_reset)
1572 status = hcd->driver->start_port_reset(hcd, port_num);
1573
1574 /* run khubd shortly after (first) root port reset finishes;
1575 * it may issue others, until at least 50 msecs have passed.
1576 */
1577 if (status == 0)
1578 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10));
1579 return status;
1580}
1581EXPORT_SYMBOL (usb_bus_start_enum);
1582
1583#endif
1584
1585/*-------------------------------------------------------------------------*/
1586
1587/*
1588 * usb_hcd_operations - adapts usb_bus framework to HCD framework (bus glue)
1589 */
1590static struct usb_operations usb_hcd_operations = {
1591 .get_frame_number = hcd_get_frame_number,
1592 .submit_urb = hcd_submit_urb,
1593 .unlink_urb = hcd_unlink_urb,
1594 .buffer_alloc = hcd_buffer_alloc,
1595 .buffer_free = hcd_buffer_free,
1596 .disable = hcd_endpoint_disable,
1da177e4
LT		 1597};
1598
1599/*-------------------------------------------------------------------------*/
1600
1601/**
1602 * usb_hcd_giveback_urb - return URB from HCD to device driver
1603 * @hcd: host controller returning the URB
1604 * @urb: urb being returned to the USB device driver.
1605 * @regs: pt_regs, passed down to the URB completion handler
1606 * Context: in_interrupt()
1607 *
1608 * This hands the URB from HCD to its USB device driver, using its
1609 * completion function. The HCD has freed all per-urb resources
1610 * (and is done using urb->hcpriv). It also released all HCD locks;
1611 * the device driver won't cause problems if it frees, modifies,
1612 * or resubmits this URB.
1613 */
1614void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb, struct pt_regs *regs)
1615{
1616 int at_root_hub;
1617
1618 at_root_hub = (urb->dev == hcd->self.root_hub);
1619 urb_unlink (urb);
1620
1621 /* lower level hcd code should use *_dma exclusively */
1622 if (hcd->self.controller->dma_mask && !at_root_hub) {
1623 if (usb_pipecontrol (urb->pipe)
1624 && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
1625 dma_unmap_single (hcd->self.controller, urb->setup_dma,
1626 sizeof (struct usb_ctrlrequest),
1627 DMA_TO_DEVICE);
1628 if (urb->transfer_buffer_length != 0
1629 && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP))
1630 dma_unmap_single (hcd->self.controller,
1631 urb->transfer_dma,
1632 urb->transfer_buffer_length,
1633 usb_pipein (urb->pipe)
1634 ? DMA_FROM_DEVICE
1635 : DMA_TO_DEVICE);
1636 }
1637
1638 usbmon_urb_complete (&hcd->self, urb);
1639 /* pass ownership to the completion handler */
1640 urb->complete (urb, regs);
1641 atomic_dec (&urb->use_count);
1642 if (unlikely (urb->reject))
1643 wake_up (&usb_kill_urb_queue);
1644 usb_put_urb (urb);
1645}
1646EXPORT_SYMBOL (usb_hcd_giveback_urb);
1647
1648/*-------------------------------------------------------------------------*/
1649
1650/**
1651 * usb_hcd_irq - hook IRQs to HCD framework (bus glue)
1652 * @irq: the IRQ being raised
1653 * @__hcd: pointer to the HCD whose IRQ is being signaled
1654 * @r: saved hardware registers
1655 *
1656 * If the controller isn't HALTed, calls the driver's irq handler.
1657 * Checks whether the controller is now dead.
1658 */
1659irqreturn_t usb_hcd_irq (int irq, void *__hcd, struct pt_regs * r)
1660{
1661 struct usb_hcd *hcd = __hcd;
1662 int start = hcd->state;
1663
8de98402
BH		 1664 if (unlikely(start == HC_STATE_HALT ||
1665 !test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
1da177e4
LT		 1666 return IRQ_NONE;
1667 if (hcd->driver->irq (hcd, r) == IRQ_NONE)
1668 return IRQ_NONE;
1669
8de98402
BH		 1670 set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
1671
1672 if (unlikely(hcd->state == HC_STATE_HALT))
1da177e4
LT		 1673 usb_hc_died (hcd);
1674 return IRQ_HANDLED;
1675}
1676
1677/*-------------------------------------------------------------------------*/
1678
1679/**
1680 * usb_hc_died - report abnormal shutdown of a host controller (bus glue)
1681 * @hcd: pointer to the HCD representing the controller
1682 *
1683 * This is called by bus glue to report a USB host controller that died
1684 * while operations may still have been pending. It's called automatically
1685 * by the PCI glue, so only glue for non-PCI busses should need to call it.
1686 */
1687void usb_hc_died (struct usb_hcd *hcd)
1688{
1689 unsigned long flags;
1690
1691 dev_err (hcd->self.controller, "HC died; cleaning up\n");
1692
1693 spin_lock_irqsave (&hcd_root_hub_lock, flags);
1694 if (hcd->rh_registered) {
d5926ae7 1695 hcd->poll_rh = 0;
1da177e4
LT		 1696
1697 /* make khubd clean up old urbs and devices */
1698 usb_set_device_state (hcd->self.root_hub,
1699 USB_STATE_NOTATTACHED);
1700 usb_kick_khubd (hcd->self.root_hub);
1701 }
1702 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
1703}
1704EXPORT_SYMBOL_GPL (usb_hc_died);
1705
1706/*-------------------------------------------------------------------------*/
1707
1708static void hcd_release (struct usb_bus *bus)
1709{
1710 struct usb_hcd *hcd;
1711
1712 hcd = container_of(bus, struct usb_hcd, self);
1713 kfree(hcd);
1714}
1715
1716/**
1717 * usb_create_hcd - create and initialize an HCD structure
1718 * @driver: HC driver that will use this hcd
1719 * @dev: device for this HC, stored in hcd->self.controller
1720 * @bus_name: value to store in hcd->self.bus_name
1721 * Context: !in_interrupt()
1722 *
1723 * Allocate a struct usb_hcd, with extra space at the end for the
1724 * HC driver's private data. Initialize the generic members of the
1725 * hcd structure.
1726 *
1727 * If memory is unavailable, returns NULL.
1728 */
1729struct usb_hcd *usb_create_hcd (const struct hc_driver *driver,
1730 struct device *dev, char *bus_name)
1731{
1732 struct usb_hcd *hcd;
1733
7b842b6e 1734 hcd = kzalloc(sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL);
1da177e4
LT		 1735 if (!hcd) {
1736 dev_dbg (dev, "hcd alloc failed\n");
1737 return NULL;
1738 }
1739 dev_set_drvdata(dev, hcd);
1740
1741 usb_bus_init(&hcd->self);
1742 hcd->self.op = &usb_hcd_operations;
1743 hcd->self.hcpriv = hcd;
1744 hcd->self.release = &hcd_release;
1745 hcd->self.controller = dev;
1746 hcd->self.bus_name = bus_name;
1747
1748 init_timer(&hcd->rh_timer);
d5926ae7
AS		 1749 hcd->rh_timer.function = rh_timer_func;
1750 hcd->rh_timer.data = (unsigned long) hcd;
1da177e4
LT		 1751
1752 hcd->driver = driver;
1753 hcd->product_desc = (driver->product_desc) ? driver->product_desc :
1754 "USB Host Controller";
1755
1756 return hcd;
1757}
1758EXPORT_SYMBOL (usb_create_hcd);
1759
1760void usb_put_hcd (struct usb_hcd *hcd)
1761{
1762 dev_set_drvdata(hcd->self.controller, NULL);
1763 usb_bus_put(&hcd->self);
1764}
1765EXPORT_SYMBOL (usb_put_hcd);
1766
1767/**
1768 * usb_add_hcd - finish generic HCD structure initialization and register
1769 * @hcd: the usb_hcd structure to initialize
1770 * @irqnum: Interrupt line to allocate
1771 * @irqflags: Interrupt type flags
1772 *
1773 * Finish the remaining parts of generic HCD initialization: allocate the
1774 * buffers of consistent memory, register the bus, request the IRQ line,
1775 * and call the driver's reset() and start() routines.
1776 */
1777int usb_add_hcd(struct usb_hcd *hcd,
1778 unsigned int irqnum, unsigned long irqflags)
1779{
8ec8d20b
AS		 1780 int retval;
1781 struct usb_device *rhdev;
1da177e4
LT		 1782
1783 dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
1784
8de98402
BH		 1785 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1786
b1e8f0a6
DB		 1787 /* HC is in reset state, but accessible. Now do the one-time init,
1788 * bottom up so that hcds can customize the root hubs before khubd
1789 * starts talking to them. (Note, bus id is assigned early too.)
1790 */
1da177e4
LT		 1791 if ((retval = hcd_buffer_create(hcd)) != 0) {
1792 dev_dbg(hcd->self.controller, "pool alloc failed\n");
1793 return retval;
1794 }
1795
1796 if ((retval = usb_register_bus(&hcd->self)) < 0)
8ec8d20b 1797 goto err_register_bus;
1da177e4 1798
b1e8f0a6
DB		 1799 if ((rhdev = usb_alloc_dev(NULL, &hcd->self, 0)) == NULL) {
1800 dev_err(hcd->self.controller, "unable to allocate root hub\n");
1801 retval = -ENOMEM;
1802 goto err_allocate_root_hub;
1803 }
1804 rhdev->speed = (hcd->driver->flags & HCD_USB2) ? USB_SPEED_HIGH :
1805 USB_SPEED_FULL;
1806 hcd->self.root_hub = rhdev;
1807
db4cefaa
DB		 1808 /* wakeup flag init defaults to "everything works" for root hubs,
1809 * but drivers can override it in reset() if needed, along with
1810 * recording the overall controller's system wakeup capability.
1811 */
1812 device_init_wakeup(&rhdev->dev, 1);
1813
b1e8f0a6
DB		 1814 /* "reset" is misnamed; its role is now one-time init. the controller
1815 * should already have been reset (and boot firmware kicked off etc).
1816 */
1817 if (hcd->driver->reset && (retval = hcd->driver->reset(hcd)) < 0) {
1818 dev_err(hcd->self.controller, "can't setup\n");
1819 goto err_hcd_driver_setup;
1820 }
1821
fb669cc0
DB		 1822 /* NOTE: root hub and controller capabilities may not be the same */
1823 if (device_can_wakeup(hcd->self.controller)
1824 && device_can_wakeup(&hcd->self.root_hub->dev))
b1e8f0a6 1825 dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
b1e8f0a6
DB		 1826
1827 /* enable irqs just before we start the controller */
1da177e4
LT		 1828 if (hcd->driver->irq) {
1829 char buf[8], *bufp = buf;
1830
1831#ifdef __sparc__
1832 bufp = __irq_itoa(irqnum);
1833#else
1834 sprintf(buf, "%d", irqnum);
1835#endif
1836
1837 snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d",
1838 hcd->driver->description, hcd->self.busnum);
1839 if ((retval = request_irq(irqnum, &usb_hcd_irq, irqflags,
1840 hcd->irq_descr, hcd)) != 0) {
1841 dev_err(hcd->self.controller,
1842 "request interrupt %s failed\n", bufp);
8ec8d20b 1843 goto err_request_irq;
1da177e4
LT		 1844 }
1845 hcd->irq = irqnum;
1846 dev_info(hcd->self.controller, "irq %s, %s 0x%08llx\n", bufp,
1847 (hcd->driver->flags & HCD_MEMORY) ?
1848 "io mem" : "io base",
1849 (unsigned long long)hcd->rsrc_start);
1850 } else {
1851 hcd->irq = -1;
1852 if (hcd->rsrc_start)
1853 dev_info(hcd->self.controller, "%s 0x%08llx\n",
1854 (hcd->driver->flags & HCD_MEMORY) ?
1855 "io mem" : "io base",
1856 (unsigned long long)hcd->rsrc_start);
1857 }
1858
1859 if ((retval = hcd->driver->start(hcd)) < 0) {
1860 dev_err(hcd->self.controller, "startup error %d\n", retval);
8ec8d20b 1861 goto err_hcd_driver_start;
1da177e4
LT		 1862 }
1863
b1e8f0a6 1864 /* starting here, usbcore will pay attention to this root hub */
55c52718 1865 rhdev->bus_mA = min(500u, hcd->power_budget);
b1e8f0a6 1866 if ((retval = register_root_hub(hcd)) != 0)
8ec8d20b
AS		 1867 goto err_register_root_hub;
1868
d5926ae7
AS		 1869 if (hcd->uses_new_polling && hcd->poll_rh)
1870 usb_hcd_poll_rh_status(hcd);
1da177e4
LT		 1871 return retval;
1872
b1e8f0a6 1873err_register_root_hub:
8ec8d20b 1874 hcd->driver->stop(hcd);
b1e8f0a6 1875err_hcd_driver_start:
1da177e4
LT		 1876 if (hcd->irq >= 0)
1877 free_irq(irqnum, hcd);
b1e8f0a6
DB		 1878err_request_irq:
1879err_hcd_driver_setup:
1880 hcd->self.root_hub = NULL;
1881 usb_put_dev(rhdev);
1882err_allocate_root_hub:
1da177e4 1883 usb_deregister_bus(&hcd->self);
b1e8f0a6 1884err_register_bus:
1da177e4
LT		 1885 hcd_buffer_destroy(hcd);
1886 return retval;
1887}
1888EXPORT_SYMBOL (usb_add_hcd);
1889
1890/**
1891 * usb_remove_hcd - shutdown processing for generic HCDs
1892 * @hcd: the usb_hcd structure to remove
1893 * Context: !in_interrupt()
1894 *
1895 * Disconnects the root hub, then reverses the effects of usb_add_hcd(),
1896 * invoking the HCD's stop() method.
1897 */
1898void usb_remove_hcd(struct usb_hcd *hcd)
1899{
1900 dev_info(hcd->self.controller, "remove, state %x\n", hcd->state);
1901
1902 if (HC_IS_RUNNING (hcd->state))
1903 hcd->state = HC_STATE_QUIESCING;
1904
1905 dev_dbg(hcd->self.controller, "roothub graceful disconnect\n");
1906 spin_lock_irq (&hcd_root_hub_lock);
1907 hcd->rh_registered = 0;
1908 spin_unlock_irq (&hcd_root_hub_lock);
9ad3d6cc 1909
4186ecf8 1910 mutex_lock(&usb_bus_list_lock);
1da177e4 1911 usb_disconnect(&hcd->self.root_hub);
4186ecf8 1912 mutex_unlock(&usb_bus_list_lock);
1da177e4 1913
d5926ae7
AS		 1914 hcd->poll_rh = 0;
1915 del_timer_sync(&hcd->rh_timer);
1916
1da177e4
LT		 1917 hcd->driver->stop(hcd);
1918 hcd->state = HC_STATE_HALT;
1919
1920 if (hcd->irq >= 0)
1921 free_irq(hcd->irq, hcd);
1922 usb_deregister_bus(&hcd->self);
1923 hcd_buffer_destroy(hcd);
1924}
1925EXPORT_SYMBOL (usb_remove_hcd);
1926
1927/*-------------------------------------------------------------------------*/
1928
4749f32d 1929#if defined(CONFIG_USB_MON)
1da177e4
LT		 1930
1931struct usb_mon_operations *mon_ops;
1932
1933/*
1934 * The registration is unlocked.
1935 * We do it this way because we do not want to lock in hot paths.
1936 *
1937 * Notice that the code is minimally error-proof. Because usbmon needs
1938 * symbols from usbcore, usbcore gets referenced and cannot be unloaded first.
1939 */
1940
1941int usb_mon_register (struct usb_mon_operations *ops)
1942{
1943
1944 if (mon_ops)
1945 return -EBUSY;
1946
1947 mon_ops = ops;
1948 mb();
1949 return 0;
1950}
1951EXPORT_SYMBOL_GPL (usb_mon_register);
1952
1953void usb_mon_deregister (void)
1954{
1955
1956 if (mon_ops == NULL) {
1957 printk(KERN_ERR "USB: monitor was not registered\n");
1958 return;
1959 }
1960 mon_ops = NULL;
1961 mb();
1962}
1963EXPORT_SYMBOL_GPL (usb_mon_deregister);
1964
1965#endif /* CONFIG_USB_MON */
kernel source for telekom puls (alcatel/mediatek)