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usbcore: Add flag for whether a host controller uses DMA
[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
1da177e4
LT		 25#include <linux/module.h>
26#include <linux/version.h>
27#include <linux/kernel.h>
28#include <linux/slab.h>
29#include <linux/completion.h>
30#include <linux/utsname.h>
31#include <linux/mm.h>
32#include <asm/io.h>
33#include <asm/scatterlist.h>
34#include <linux/device.h>
35#include <linux/dma-mapping.h>
4186ecf8 36#include <linux/mutex.h>
1da177e4
LT		 37#include <asm/irq.h>
38#include <asm/byteorder.h>
64a21d02 39#include <linux/platform_device.h>
1da177e4
LT		 40
41#include <linux/usb.h>
42
43#include "usb.h"
44#include "hcd.h"
45#include "hub.h"
46
47
48// #define USB_BANDWIDTH_MESSAGES
49
50/*-------------------------------------------------------------------------*/
51
52/*
53 * USB Host Controller Driver framework
54 *
55 * Plugs into usbcore (usb_bus) and lets HCDs share code, minimizing
56 * HCD-specific behaviors/bugs.
57 *
58 * This does error checks, tracks devices and urbs, and delegates to a
59 * "hc_driver" only for code (and data) that really needs to know about
60 * hardware differences. That includes root hub registers, i/o queues,
61 * and so on ... but as little else as possible.
62 *
63 * Shared code includes most of the "root hub" code (these are emulated,
64 * though each HC's hardware works differently) and PCI glue, plus request
65 * tracking overhead. The HCD code should only block on spinlocks or on
66 * hardware handshaking; blocking on software events (such as other kernel
67 * threads releasing resources, or completing actions) is all generic.
68 *
69 * Happens the USB 2.0 spec says this would be invisible inside the "USBD",
70 * and includes mostly a "HCDI" (HCD Interface) along with some APIs used
71 * only by the hub driver ... and that neither should be seen or used by
72 * usb client device drivers.
73 *
74 * Contributors of ideas or unattributed patches include: David Brownell,
75 * Roman Weissgaerber, Rory Bolt, Greg Kroah-Hartman, ...
76 *
77 * HISTORY:
78 * 2002-02-21 Pull in most of the usb_bus support from usb.c; some
79 * associated cleanup. "usb_hcd" still != "usb_bus".
80 * 2001-12-12 Initial patch version for Linux 2.5.1 kernel.
81 */
82
83/*-------------------------------------------------------------------------*/
84
85/* host controllers we manage */
86LIST_HEAD (usb_bus_list);
87EXPORT_SYMBOL_GPL (usb_bus_list);
88
89/* used when allocating bus numbers */
90#define USB_MAXBUS 64
91struct usb_busmap {
92 unsigned long busmap [USB_MAXBUS / (8*sizeof (unsigned long))];
93};
94static struct usb_busmap busmap;
95
96/* used when updating list of hcds */
4186ecf8 97DEFINE_MUTEX(usb_bus_list_lock); /* exported only for usbfs */
1da177e4
LT		 98EXPORT_SYMBOL_GPL (usb_bus_list_lock);
99
100/* used for controlling access to virtual root hubs */
101static DEFINE_SPINLOCK(hcd_root_hub_lock);
102
103/* used when updating hcd data */
104static DEFINE_SPINLOCK(hcd_data_lock);
105
106/* wait queue for synchronous unlinks */
107DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue);
108
109/*-------------------------------------------------------------------------*/
110
111/*
112 * Sharable chunks of root hub code.
113 */
114
115/*-------------------------------------------------------------------------*/
116
117#define KERNEL_REL ((LINUX_VERSION_CODE >> 16) & 0x0ff)
118#define KERNEL_VER ((LINUX_VERSION_CODE >> 8) & 0x0ff)
119
120/* usb 2.0 root hub device descriptor */
121static const u8 usb2_rh_dev_descriptor [18] = {
122 0x12, /* __u8 bLength; */
123 0x01, /* __u8 bDescriptorType; Device */
124 0x00, 0x02, /* __le16 bcdUSB; v2.0 */
125
126 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
127 0x00, /* __u8 bDeviceSubClass; */
128 0x01, /* __u8 bDeviceProtocol; [ usb 2.0 single TT ]*/
16f16d11 129 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
1da177e4
LT		 130
131 0x00, 0x00, /* __le16 idVendor; */
132 0x00, 0x00, /* __le16 idProduct; */
133 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
134
135 0x03, /* __u8 iManufacturer; */
136 0x02, /* __u8 iProduct; */
137 0x01, /* __u8 iSerialNumber; */
138 0x01 /* __u8 bNumConfigurations; */
139};
140
141/* no usb 2.0 root hub "device qualifier" descriptor: one speed only */
142
143/* usb 1.1 root hub device descriptor */
144static const u8 usb11_rh_dev_descriptor [18] = {
145 0x12, /* __u8 bLength; */
146 0x01, /* __u8 bDescriptorType; Device */
147 0x10, 0x01, /* __le16 bcdUSB; v1.1 */
148
149 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
150 0x00, /* __u8 bDeviceSubClass; */
151 0x00, /* __u8 bDeviceProtocol; [ low/full speeds only ] */
16f16d11 152 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
1da177e4
LT		 153
154 0x00, 0x00, /* __le16 idVendor; */
155 0x00, 0x00, /* __le16 idProduct; */
156 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
157
158 0x03, /* __u8 iManufacturer; */
159 0x02, /* __u8 iProduct; */
160 0x01, /* __u8 iSerialNumber; */
161 0x01 /* __u8 bNumConfigurations; */
162};
163
164
165/*-------------------------------------------------------------------------*/
166
167/* Configuration descriptors for our root hubs */
168
169static const u8 fs_rh_config_descriptor [] = {
170
171 /* one configuration */
172 0x09, /* __u8 bLength; */
173 0x02, /* __u8 bDescriptorType; Configuration */
174 0x19, 0x00, /* __le16 wTotalLength; */
175 0x01, /* __u8 bNumInterfaces; (1) */
176 0x01, /* __u8 bConfigurationValue; */
177 0x00, /* __u8 iConfiguration; */
178 0xc0, /* __u8 bmAttributes;
179 Bit 7: must be set,
180 6: Self-powered,
181 5: Remote wakeup,
182 4..0: resvd */
183 0x00, /* __u8 MaxPower; */
184
185 /* USB 1.1:
186 * USB 2.0, single TT organization (mandatory):
187 * one interface, protocol 0
188 *
189 * USB 2.0, multiple TT organization (optional):
190 * two interfaces, protocols 1 (like single TT)
191 * and 2 (multiple TT mode) ... config is
192 * sometimes settable
193 * NOT IMPLEMENTED
194 */
195
196 /* one interface */
197 0x09, /* __u8 if_bLength; */
198 0x04, /* __u8 if_bDescriptorType; Interface */
199 0x00, /* __u8 if_bInterfaceNumber; */
200 0x00, /* __u8 if_bAlternateSetting; */
201 0x01, /* __u8 if_bNumEndpoints; */
202 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
203 0x00, /* __u8 if_bInterfaceSubClass; */
204 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
205 0x00, /* __u8 if_iInterface; */
206
207 /* one endpoint (status change endpoint) */
208 0x07, /* __u8 ep_bLength; */
209 0x05, /* __u8 ep_bDescriptorType; Endpoint */
210 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
211 0x03, /* __u8 ep_bmAttributes; Interrupt */
212 0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */
213 0xff /* __u8 ep_bInterval; (255ms -- usb 2.0 spec) */
214};
215
216static const u8 hs_rh_config_descriptor [] = {
217
218 /* one configuration */
219 0x09, /* __u8 bLength; */
220 0x02, /* __u8 bDescriptorType; Configuration */
221 0x19, 0x00, /* __le16 wTotalLength; */
222 0x01, /* __u8 bNumInterfaces; (1) */
223 0x01, /* __u8 bConfigurationValue; */
224 0x00, /* __u8 iConfiguration; */
225 0xc0, /* __u8 bmAttributes;
226 Bit 7: must be set,
227 6: Self-powered,
228 5: Remote wakeup,
229 4..0: resvd */
230 0x00, /* __u8 MaxPower; */
231
232 /* USB 1.1:
233 * USB 2.0, single TT organization (mandatory):
234 * one interface, protocol 0
235 *
236 * USB 2.0, multiple TT organization (optional):
237 * two interfaces, protocols 1 (like single TT)
238 * and 2 (multiple TT mode) ... config is
239 * sometimes settable
240 * NOT IMPLEMENTED
241 */
242
243 /* one interface */
244 0x09, /* __u8 if_bLength; */
245 0x04, /* __u8 if_bDescriptorType; Interface */
246 0x00, /* __u8 if_bInterfaceNumber; */
247 0x00, /* __u8 if_bAlternateSetting; */
248 0x01, /* __u8 if_bNumEndpoints; */
249 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
250 0x00, /* __u8 if_bInterfaceSubClass; */
251 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
252 0x00, /* __u8 if_iInterface; */
253
254 /* one endpoint (status change endpoint) */
255 0x07, /* __u8 ep_bLength; */
256 0x05, /* __u8 ep_bDescriptorType; Endpoint */
257 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
258 0x03, /* __u8 ep_bmAttributes; Interrupt */
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
455b25fb
AS		 636/* Unlinks of root-hub control URBs are legal, but they don't do anything
637 * since these URBs always execute synchronously.
d5926ae7 638 */
1da177e4
LT		 639static int usb_rh_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
640{
455b25fb 641 unsigned long flags;
1da177e4 642
455b25fb
AS		 643 if (usb_pipeendpoint(urb->pipe) == 0) { /* Control URB */
644 ; /* Do nothing */
d5926ae7
AS		 645
646 } else { /* Status URB */
647 if (!hcd->uses_new_polling)
455b25fb
AS		 648 del_timer (&hcd->rh_timer);
649 local_irq_save (flags);
d5926ae7
AS		 650 spin_lock (&hcd_root_hub_lock);
651 if (urb == hcd->status_urb) {
652 hcd->status_urb = NULL;
653 urb->hcpriv = NULL;
654 } else
655 urb = NULL; /* wasn't fully queued */
656 spin_unlock (&hcd_root_hub_lock);
657 if (urb)
658 usb_hcd_giveback_urb (hcd, urb, NULL);
455b25fb 659 local_irq_restore (flags);
d5926ae7 660 }
1da177e4
LT		 661
662 return 0;
663}
664
665/*-------------------------------------------------------------------------*/
666
667/* exported only within usbcore */
8561b10f 668struct usb_bus *usb_bus_get(struct usb_bus *bus)
1da177e4 669{
8561b10f
GKH		 670 if (bus)
671 kref_get(&bus->kref);
672 return bus;
673}
1da177e4 674
8561b10f
GKH		 675static void usb_host_release(struct kref *kref)
676{
677 struct usb_bus *bus = container_of(kref, struct usb_bus, kref);
1da177e4 678
8561b10f
GKH		 679 if (bus->release)
680 bus->release(bus);
1da177e4
LT		 681}
682
683/* exported only within usbcore */
8561b10f 684void usb_bus_put(struct usb_bus *bus)
1da177e4
LT		 685{
686 if (bus)
8561b10f 687 kref_put(&bus->kref, usb_host_release);
1da177e4
LT		 688}
689
690/*-------------------------------------------------------------------------*/
691
8561b10f 692static struct class *usb_host_class;
1da177e4
LT		 693
694int usb_host_init(void)
695{
8561b10f
GKH		 696 int retval = 0;
697
698 usb_host_class = class_create(THIS_MODULE, "usb_host");
699 if (IS_ERR(usb_host_class))
700 retval = PTR_ERR(usb_host_class);
701 return retval;
1da177e4
LT		 702}
703
704void usb_host_cleanup(void)
705{
8561b10f 706 class_destroy(usb_host_class);
1da177e4
LT		 707}
708
709/**
710 * usb_bus_init - shared initialization code
711 * @bus: the bus structure being initialized
712 *
713 * This code is used to initialize a usb_bus structure, memory for which is
714 * separately managed.
715 */
716static void usb_bus_init (struct usb_bus *bus)
717{
718 memset (&bus->devmap, 0, sizeof(struct usb_devmap));
719
720 bus->devnum_next = 1;
721
722 bus->root_hub = NULL;
723 bus->hcpriv = NULL;
724 bus->busnum = -1;
725 bus->bandwidth_allocated = 0;
726 bus->bandwidth_int_reqs = 0;
727 bus->bandwidth_isoc_reqs = 0;
728
729 INIT_LIST_HEAD (&bus->bus_list);
730
8561b10f 731 kref_init(&bus->kref);
1da177e4
LT		 732}
733
1da177e4
LT		 734/*-------------------------------------------------------------------------*/
735
736/**
737 * usb_register_bus - registers the USB host controller with the usb core
738 * @bus: pointer to the bus to register
739 * Context: !in_interrupt()
740 *
741 * Assigns a bus number, and links the controller into usbcore data
742 * structures so that it can be seen by scanning the bus list.
743 */
744static int usb_register_bus(struct usb_bus *bus)
745{
746 int busnum;
1da177e4 747
4186ecf8 748 mutex_lock(&usb_bus_list_lock);
1da177e4
LT		 749 busnum = find_next_zero_bit (busmap.busmap, USB_MAXBUS, 1);
750 if (busnum < USB_MAXBUS) {
751 set_bit (busnum, busmap.busmap);
752 bus->busnum = busnum;
753 } else {
754 printk (KERN_ERR "%s: too many buses\n", usbcore_name);
4186ecf8 755 mutex_unlock(&usb_bus_list_lock);
1da177e4
LT		 756 return -E2BIG;
757 }
758
53f46542
GKH		 759 bus->class_dev = class_device_create(usb_host_class, NULL, MKDEV(0,0),
760 bus->controller, "usb_host%d", busnum);
8561b10f 761 if (IS_ERR(bus->class_dev)) {
1da177e4 762 clear_bit(busnum, busmap.busmap);
4186ecf8 763 mutex_unlock(&usb_bus_list_lock);
8561b10f 764 return PTR_ERR(bus->class_dev);
1da177e4
LT		 765 }
766
8561b10f
GKH		 767 class_set_devdata(bus->class_dev, bus);
768
1da177e4
LT		 769 /* Add it to the local list of buses */
770 list_add (&bus->bus_list, &usb_bus_list);
4186ecf8 771 mutex_unlock(&usb_bus_list_lock);
1da177e4 772
3099e75a 773 usb_notify_add_bus(bus);
1da177e4
LT		 774
775 dev_info (bus->controller, "new USB bus registered, assigned bus number %d\n", bus->busnum);
776 return 0;
777}
778
779/**
780 * usb_deregister_bus - deregisters the USB host controller
781 * @bus: pointer to the bus to deregister
782 * Context: !in_interrupt()
783 *
784 * Recycles the bus number, and unlinks the controller from usbcore data
785 * structures so that it won't be seen by scanning the bus list.
786 */
787static void usb_deregister_bus (struct usb_bus *bus)
788{
789 dev_info (bus->controller, "USB bus %d deregistered\n", bus->busnum);
790
791 /*
792 * NOTE: make sure that all the devices are removed by the
793 * controller code, as well as having it call this when cleaning
794 * itself up
795 */
4186ecf8 796 mutex_lock(&usb_bus_list_lock);
1da177e4 797 list_del (&bus->bus_list);
4186ecf8 798 mutex_unlock(&usb_bus_list_lock);
1da177e4 799
3099e75a 800 usb_notify_remove_bus(bus);
1da177e4
LT		 801
802 clear_bit (bus->busnum, busmap.busmap);
803
8561b10f 804 class_device_unregister(bus->class_dev);
1da177e4
LT		 805}
806
807/**
8ec8d20b 808 * register_root_hub - called by usb_add_hcd() to register a root hub
1da177e4
LT		 809 * @hcd: host controller for this root hub
810 *
8ec8d20b 811 * This function registers the root hub with the USB subsystem. It sets up
b1e8f0a6
DB		 812 * the device properly in the device tree and then calls usb_new_device()
813 * to register the usb device. It also assigns the root hub's USB address
814 * (always 1).
1da177e4 815 */
b1e8f0a6 816static int register_root_hub(struct usb_hcd *hcd)
1da177e4
LT		 817{
818 struct device *parent_dev = hcd->self.controller;
b1e8f0a6 819 struct usb_device *usb_dev = hcd->self.root_hub;
1da177e4
LT		 820 const int devnum = 1;
821 int retval;
822
1da177e4
LT		 823 usb_dev->devnum = devnum;
824 usb_dev->bus->devnum_next = devnum + 1;
825 memset (&usb_dev->bus->devmap.devicemap, 0,
826 sizeof usb_dev->bus->devmap.devicemap);
827 set_bit (devnum, usb_dev->bus->devmap.devicemap);
828 usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
829
4186ecf8 830 mutex_lock(&usb_bus_list_lock);
1da177e4
LT		 831
832 usb_dev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
833 retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE);
834 if (retval != sizeof usb_dev->descriptor) {
4186ecf8 835 mutex_unlock(&usb_bus_list_lock);
1da177e4
LT		 836 dev_dbg (parent_dev, "can't read %s device descriptor %d\n",
837 usb_dev->dev.bus_id, retval);
838 return (retval < 0) ? retval : -EMSGSIZE;
839 }
840
1da177e4 841 retval = usb_new_device (usb_dev);
1da177e4 842 if (retval) {
1da177e4
LT		 843 dev_err (parent_dev, "can't register root hub for %s, %d\n",
844 usb_dev->dev.bus_id, retval);
845 }
4186ecf8 846 mutex_unlock(&usb_bus_list_lock);
1da177e4
LT		 847
848 if (retval == 0) {
849 spin_lock_irq (&hcd_root_hub_lock);
850 hcd->rh_registered = 1;
851 spin_unlock_irq (&hcd_root_hub_lock);
852
853 /* Did the HC die before the root hub was registered? */
854 if (hcd->state == HC_STATE_HALT)
855 usb_hc_died (hcd); /* This time clean up */
856 }
857
858 return retval;
859}
1da177e4 860
d5926ae7
AS		 861void usb_enable_root_hub_irq (struct usb_bus *bus)
862{
863 struct usb_hcd *hcd;
864
865 hcd = container_of (bus, struct usb_hcd, self);
866 if (hcd->driver->hub_irq_enable && !hcd->poll_rh &&
867 hcd->state != HC_STATE_HALT)
868 hcd->driver->hub_irq_enable (hcd);
869}
870
1da177e4
LT		 871
872/*-------------------------------------------------------------------------*/
873
874/**
875 * usb_calc_bus_time - approximate periodic transaction time in nanoseconds
876 * @speed: from dev->speed; USB_SPEED_{LOW,FULL,HIGH}
877 * @is_input: true iff the transaction sends data to the host
878 * @isoc: true for isochronous transactions, false for interrupt ones
879 * @bytecount: how many bytes in the transaction.
880 *
881 * Returns approximate bus time in nanoseconds for a periodic transaction.
882 * See USB 2.0 spec section 5.11.3; only periodic transfers need to be
883 * scheduled in software, this function is only used for such scheduling.
884 */
885long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount)
886{
887 unsigned long tmp;
888
889 switch (speed) {
890 case USB_SPEED_LOW: /* INTR only */
891 if (is_input) {
892 tmp = (67667L * (31L + 10L * BitTime (bytecount))) / 1000L;
893 return (64060L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
894 } else {
895 tmp = (66700L * (31L + 10L * BitTime (bytecount))) / 1000L;
896 return (64107L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
897 }
898 case USB_SPEED_FULL: /* ISOC or INTR */
899 if (isoc) {
900 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
901 return (((is_input) ? 7268L : 6265L) + BW_HOST_DELAY + tmp);
902 } else {
903 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
904 return (9107L + BW_HOST_DELAY + tmp);
905 }
906 case USB_SPEED_HIGH: /* ISOC or INTR */
907 // FIXME adjust for input vs output
908 if (isoc)
498f78e6 909 tmp = HS_NSECS_ISO (bytecount);
1da177e4 910 else
498f78e6 911 tmp = HS_NSECS (bytecount);
1da177e4
LT		 912 return tmp;
913 default:
914 pr_debug ("%s: bogus device speed!\n", usbcore_name);
915 return -1;
916 }
917}
918EXPORT_SYMBOL (usb_calc_bus_time);
919
920/*
921 * usb_check_bandwidth():
922 *
923 * old_alloc is from host_controller->bandwidth_allocated in microseconds;
924 * bustime is from calc_bus_time(), but converted to microseconds.
925 *
926 * returns <bustime in us> if successful,
927 * or -ENOSPC if bandwidth request fails.
928 *
929 * FIXME:
930 * This initial implementation does not use Endpoint.bInterval
931 * in managing bandwidth allocation.
932 * It probably needs to be expanded to use Endpoint.bInterval.
933 * This can be done as a later enhancement (correction).
934 *
935 * This will also probably require some kind of
936 * frame allocation tracking...meaning, for example,
937 * that if multiple drivers request interrupts every 10 USB frames,
938 * they don't all have to be allocated at
939 * frame numbers N, N+10, N+20, etc. Some of them could be at
940 * N+11, N+21, N+31, etc., and others at
941 * N+12, N+22, N+32, etc.
942 *
943 * Similarly for isochronous transfers...
944 *
945 * Individual HCDs can schedule more directly ... this logic
946 * is not correct for high speed transfers.
947 */
948int usb_check_bandwidth (struct usb_device *dev, struct urb *urb)
949{
950 unsigned int pipe = urb->pipe;
951 long bustime;
952 int is_in = usb_pipein (pipe);
953 int is_iso = usb_pipeisoc (pipe);
954 int old_alloc = dev->bus->bandwidth_allocated;
955 int new_alloc;
956
957
958 bustime = NS_TO_US (usb_calc_bus_time (dev->speed, is_in, is_iso,
959 usb_maxpacket (dev, pipe, !is_in)));
960 if (is_iso)
961 bustime /= urb->number_of_packets;
962
963 new_alloc = old_alloc + (int) bustime;
964 if (new_alloc > FRAME_TIME_MAX_USECS_ALLOC) {
965#ifdef DEBUG
966 char *mode =
967#ifdef CONFIG_USB_BANDWIDTH
968 "";
969#else
970 "would have ";
971#endif
972 dev_dbg (&dev->dev, "usb_check_bandwidth %sFAILED: %d + %ld = %d usec\n",
973 mode, old_alloc, bustime, new_alloc);
974#endif
975#ifdef CONFIG_USB_BANDWIDTH
976 bustime = -ENOSPC; /* report error */
977#endif
978 }
979
980 return bustime;
981}
982EXPORT_SYMBOL (usb_check_bandwidth);
983
984
985/**
986 * usb_claim_bandwidth - records bandwidth for a periodic transfer
987 * @dev: source/target of request
988 * @urb: request (urb->dev == dev)
989 * @bustime: bandwidth consumed, in (average) microseconds per frame
990 * @isoc: true iff the request is isochronous
991 *
992 * Bus bandwidth reservations are recorded purely for diagnostic purposes.
993 * HCDs are expected not to overcommit periodic bandwidth, and to record such
994 * reservations whenever endpoints are added to the periodic schedule.
995 *
996 * FIXME averaging per-frame is suboptimal. Better to sum over the HCD's
997 * entire periodic schedule ... 32 frames for OHCI, 1024 for UHCI, settable
998 * for EHCI (256/512/1024 frames, default 1024) and have the bus expose how
999 * large its periodic schedule is.
1000 */
1001void usb_claim_bandwidth (struct usb_device *dev, struct urb *urb, int bustime, int isoc)
1002{
1003 dev->bus->bandwidth_allocated += bustime;
1004 if (isoc)
1005 dev->bus->bandwidth_isoc_reqs++;
1006 else
1007 dev->bus->bandwidth_int_reqs++;
1008 urb->bandwidth = bustime;
1009
1010#ifdef USB_BANDWIDTH_MESSAGES
1011 dev_dbg (&dev->dev, "bandwidth alloc increased by %d (%s) to %d for %d requesters\n",
1012 bustime,
1013 isoc ? "ISOC" : "INTR",
1014 dev->bus->bandwidth_allocated,
1015 dev->bus->bandwidth_int_reqs + dev->bus->bandwidth_isoc_reqs);
1016#endif
1017}
1018EXPORT_SYMBOL (usb_claim_bandwidth);
1019
1020
1021/**
1022 * usb_release_bandwidth - reverses effect of usb_claim_bandwidth()
1023 * @dev: source/target of request
1024 * @urb: request (urb->dev == dev)
1025 * @isoc: true iff the request is isochronous
1026 *
1027 * This records that previously allocated bandwidth has been released.
1028 * Bandwidth is released when endpoints are removed from the host controller's
1029 * periodic schedule.
1030 */
1031void usb_release_bandwidth (struct usb_device *dev, struct urb *urb, int isoc)
1032{
1033 dev->bus->bandwidth_allocated -= urb->bandwidth;
1034 if (isoc)
1035 dev->bus->bandwidth_isoc_reqs--;
1036 else
1037 dev->bus->bandwidth_int_reqs--;
1038
1039#ifdef USB_BANDWIDTH_MESSAGES
1040 dev_dbg (&dev->dev, "bandwidth alloc reduced by %d (%s) to %d for %d requesters\n",
1041 urb->bandwidth,
1042 isoc ? "ISOC" : "INTR",
1043 dev->bus->bandwidth_allocated,
1044 dev->bus->bandwidth_int_reqs + dev->bus->bandwidth_isoc_reqs);
1045#endif
1046 urb->bandwidth = 0;
1047}
1048EXPORT_SYMBOL (usb_release_bandwidth);
1049
1050
1051/*-------------------------------------------------------------------------*/
1052
1053/*
1054 * Generic HC operations.
1055 */
1056
1057/*-------------------------------------------------------------------------*/
1058
1059static void urb_unlink (struct urb *urb)
1060{
1061 unsigned long flags;
1062
1063 /* Release any periodic transfer bandwidth */
1064 if (urb->bandwidth)
1065 usb_release_bandwidth (urb->dev, urb,
1066 usb_pipeisoc (urb->pipe));
1067
1068 /* clear all state linking urb to this dev (and hcd) */
1069
1070 spin_lock_irqsave (&hcd_data_lock, flags);
1071 list_del_init (&urb->urb_list);
1072 spin_unlock_irqrestore (&hcd_data_lock, flags);
1da177e4
LT		 1073}
1074
1075
1076/* may be called in any context with a valid urb->dev usecount
1077 * caller surrenders "ownership" of urb
1078 * expects usb_submit_urb() to have sanity checked and conditioned all
1079 * inputs in the urb
1080 */
a6d2bb9f 1081int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
1da177e4
LT		 1082{
1083 int status;
1084 struct usb_hcd *hcd = urb->dev->bus->hcpriv;
1085 struct usb_host_endpoint *ep;
1086 unsigned long flags;
1087
1088 if (!hcd)
1089 return -ENODEV;
1090
1091 usbmon_urb_submit(&hcd->self, urb);
1092
1093 /*
1094 * Atomically queue the urb, first to our records, then to the HCD.
1095 * Access to urb->status is controlled by urb->lock ... changes on
1096 * i/o completion (normal or fault) or unlinking.
1097 */
1098
1099 // FIXME: verify that quiescing hc works right (RH cleans up)
1100
1101 spin_lock_irqsave (&hcd_data_lock, flags);
1102 ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out)
1103 [usb_pipeendpoint(urb->pipe)];
1104 if (unlikely (!ep))
1105 status = -ENOENT;
1106 else if (unlikely (urb->reject))
1107 status = -EPERM;
1108 else switch (hcd->state) {
1109 case HC_STATE_RUNNING:
1110 case HC_STATE_RESUMING:
979d5199 1111doit:
1da177e4
LT		 1112 list_add_tail (&urb->urb_list, &ep->urb_list);
1113 status = 0;
1114 break;
979d5199
DB		 1115 case HC_STATE_SUSPENDED:
1116 /* HC upstream links (register access, wakeup signaling) can work
1117 * even when the downstream links (and DMA etc) are quiesced; let
1118 * usbcore talk to the root hub.
1119 */
1120 if (hcd->self.controller->power.power_state.event == PM_EVENT_ON
1121 && urb->dev->parent == NULL)
1122 goto doit;
1123 /* FALL THROUGH */
1da177e4
LT		 1124 default:
1125 status = -ESHUTDOWN;
1126 break;
1127 }
1128 spin_unlock_irqrestore (&hcd_data_lock, flags);
1129 if (status) {
1130 INIT_LIST_HEAD (&urb->urb_list);
1131 usbmon_urb_submit_error(&hcd->self, urb, status);
1132 return status;
1133 }
1134
1135 /* increment urb's reference count as part of giving it to the HCD
1136 * (which now controls it). HCD guarantees that it either returns
1137 * an error or calls giveback(), but not both.
1138 */
1139 urb = usb_get_urb (urb);
1140 atomic_inc (&urb->use_count);
1141
1142 if (urb->dev == hcd->self.root_hub) {
1143 /* NOTE: requirement on hub callers (usbfs and the hub
1144 * driver, for now) that URBs' urb->transfer_buffer be
1145 * valid and usb_buffer_{sync,unmap}() not be needed, since
1146 * they could clobber root hub response data.
1147 */
1148 status = rh_urb_enqueue (hcd, urb);
1149 goto done;
1150 }
1151
1152 /* lower level hcd code should use *_dma exclusively,
1153 * unless it uses pio or talks to another transport.
1154 */
dd990f16 1155 if (hcd->self.uses_dma) {
1da177e4
LT		 1156 if (usb_pipecontrol (urb->pipe)
1157 && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
1158 urb->setup_dma = dma_map_single (
1159 hcd->self.controller,
1160 urb->setup_packet,
1161 sizeof (struct usb_ctrlrequest),
1162 DMA_TO_DEVICE);
1163 if (urb->transfer_buffer_length != 0
1164 && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP))
1165 urb->transfer_dma = dma_map_single (
1166 hcd->self.controller,
1167 urb->transfer_buffer,
1168 urb->transfer_buffer_length,
1169 usb_pipein (urb->pipe)
1170 ? DMA_FROM_DEVICE
1171 : DMA_TO_DEVICE);
1172 }
1173
1174 status = hcd->driver->urb_enqueue (hcd, ep, urb, mem_flags);
1175done:
1176 if (unlikely (status)) {
1177 urb_unlink (urb);
1178 atomic_dec (&urb->use_count);
1179 if (urb->reject)
1180 wake_up (&usb_kill_urb_queue);
1181 usb_put_urb (urb);
1182 usbmon_urb_submit_error(&hcd->self, urb, status);
1183 }
1184 return status;
1185}
1186
1187/*-------------------------------------------------------------------------*/
1188
1189/* called in any context */
a6d2bb9f 1190int usb_hcd_get_frame_number (struct usb_device *udev)
1da177e4
LT		 1191{
1192 struct usb_hcd *hcd = (struct usb_hcd *)udev->bus->hcpriv;
1193 if (!HC_IS_RUNNING (hcd->state))
1194 return -ESHUTDOWN;
1195 return hcd->driver->get_frame_number (hcd);
1196}
1197
1198/*-------------------------------------------------------------------------*/
1199
1200/* this makes the hcd giveback() the urb more quickly, by kicking it
1201 * off hardware queues (which may take a while) and returning it as
1202 * soon as practical. we've already set up the urb's return status,
1203 * but we can't know if the callback completed already.
1204 */
1205static int
1206unlink1 (struct usb_hcd *hcd, struct urb *urb)
1207{
1208 int value;
1209
1210 if (urb->dev == hcd->self.root_hub)
1211 value = usb_rh_urb_dequeue (hcd, urb);
1212 else {
1213
1214 /* The only reason an HCD might fail this call is if
1215 * it has not yet fully queued the urb to begin with.
1216 * Such failures should be harmless. */
1217 value = hcd->driver->urb_dequeue (hcd, urb);
1218 }
1219
1220 if (value != 0)
1221 dev_dbg (hcd->self.controller, "dequeue %p --> %d\n",
1222 urb, value);
1223 return value;
1224}
1225
1226/*
1227 * called in any context
1228 *
1229 * caller guarantees urb won't be recycled till both unlink()
1230 * and the urb's completion function return
1231 */
a6d2bb9f 1232int usb_hcd_unlink_urb (struct urb *urb, int status)
1da177e4
LT		 1233{
1234 struct usb_host_endpoint *ep;
1235 struct usb_hcd *hcd = NULL;
1236 struct device *sys = NULL;
1237 unsigned long flags;
1238 struct list_head *tmp;
1239 int retval;
1240
1241 if (!urb)
1242 return -EINVAL;
1243 if (!urb->dev || !urb->dev->bus)
1244 return -ENODEV;
1245 ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out)
1246 [usb_pipeendpoint(urb->pipe)];
1247 if (!ep)
1248 return -ENODEV;
1249
1250 /*
1251 * we contend for urb->status with the hcd core,
1252 * which changes it while returning the urb.
1253 *
1254 * Caller guaranteed that the urb pointer hasn't been freed, and
1255 * that it was submitted. But as a rule it can't know whether or
1256 * not it's already been unlinked ... so we respect the reversed
1257 * lock sequence needed for the usb_hcd_giveback_urb() code paths
1258 * (urb lock, then hcd_data_lock) in case some other CPU is now
1259 * unlinking it.
1260 */
1261 spin_lock_irqsave (&urb->lock, flags);
1262 spin_lock (&hcd_data_lock);
1263
1264 sys = &urb->dev->dev;
1265 hcd = urb->dev->bus->hcpriv;
1266 if (hcd == NULL) {
1267 retval = -ENODEV;
1268 goto done;
1269 }
1270
1da177e4
LT		 1271 /* insist the urb is still queued */
1272 list_for_each(tmp, &ep->urb_list) {
1273 if (tmp == &urb->urb_list)
1274 break;
1275 }
1276 if (tmp != &urb->urb_list) {
1277 retval = -EIDRM;
1278 goto done;
1279 }
1280
1281 /* Any status except -EINPROGRESS means something already started to
1282 * unlink this URB from the hardware. So there's no more work to do.
1283 */
1284 if (urb->status != -EINPROGRESS) {
1285 retval = -EBUSY;
1286 goto done;
1287 }
1288
1289 /* IRQ setup can easily be broken so that USB controllers
1290 * never get completion IRQs ... maybe even the ones we need to
1291 * finish unlinking the initial failed usb_set_address()
1292 * or device descriptor fetch.
1293 */
8de98402
BH		 1294 if (!test_bit(HCD_FLAG_SAW_IRQ, &hcd->flags)
1295 && hcd->self.root_hub != urb->dev) {
1da177e4
LT		 1296 dev_warn (hcd->self.controller, "Unlink after no-IRQ? "
1297 "Controller is probably using the wrong IRQ."
1298 "\n");
8de98402 1299 set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
1da177e4
LT		 1300 }
1301
1302 urb->status = status;
1303
1304 spin_unlock (&hcd_data_lock);
1305 spin_unlock_irqrestore (&urb->lock, flags);
1306
1307 retval = unlink1 (hcd, urb);
1308 if (retval == 0)
1309 retval = -EINPROGRESS;
1310 return retval;
1311
1312done:
1313 spin_unlock (&hcd_data_lock);
1314 spin_unlock_irqrestore (&urb->lock, flags);
1315 if (retval != -EIDRM && sys && sys->driver)
1316 dev_dbg (sys, "hcd_unlink_urb %p fail %d\n", urb, retval);
1317 return retval;
1318}
1319
1320/*-------------------------------------------------------------------------*/
1321
1322/* disables the endpoint: cancels any pending urbs, then synchronizes with
455b25fb
AS		 1323 * the hcd to make sure all endpoint state is gone from hardware, and then
1324 * waits until the endpoint's queue is completely drained. use for
1da177e4
LT		 1325 * set_configuration, set_interface, driver removal, physical disconnect.
1326 *
1327 * example: a qh stored in ep->hcpriv, holding state related to endpoint
1328 * type, maxpacket size, toggle, halt status, and scheduling.
1329 */
a6d2bb9f
AS		 1330void usb_hcd_endpoint_disable (struct usb_device *udev,
1331 struct usb_host_endpoint *ep)
1da177e4
LT		 1332{
1333 struct usb_hcd *hcd;
1334 struct urb *urb;
1335
1336 hcd = udev->bus->hcpriv;
1337
d5926ae7
AS		 1338 WARN_ON (!HC_IS_RUNNING (hcd->state) && hcd->state != HC_STATE_HALT &&
1339 udev->state != USB_STATE_NOTATTACHED);
1da177e4
LT		 1340
1341 local_irq_disable ();
1342
1da177e4
LT		 1343 /* ep is already gone from udev->ep_{in,out}[]; no more submits */
1344rescan:
1345 spin_lock (&hcd_data_lock);
1346 list_for_each_entry (urb, &ep->urb_list, urb_list) {
1347 int tmp;
1348
455b25fb 1349 /* the urb may already have been unlinked */
1da177e4
LT		 1350 if (urb->status != -EINPROGRESS)
1351 continue;
1352 usb_get_urb (urb);
1353 spin_unlock (&hcd_data_lock);
1354
1355 spin_lock (&urb->lock);
1356 tmp = urb->status;
1357 if (tmp == -EINPROGRESS)
1358 urb->status = -ESHUTDOWN;
1359 spin_unlock (&urb->lock);
1360
1361 /* kick hcd unless it's already returning this */
1362 if (tmp == -EINPROGRESS) {
1363 tmp = urb->pipe;
1364 unlink1 (hcd, urb);
1365 dev_dbg (hcd->self.controller,
1366 "shutdown urb %p pipe %08x ep%d%s%s\n",
1367 urb, tmp, usb_pipeendpoint (tmp),
1368 (tmp & USB_DIR_IN) ? "in" : "out",
1369 ({ char *s; \
1370 switch (usb_pipetype (tmp)) { \
1371 case PIPE_CONTROL: s = ""; break; \
1372 case PIPE_BULK: s = "-bulk"; break; \
1373 case PIPE_INTERRUPT: s = "-intr"; break; \
1374 default: s = "-iso"; break; \
1375 }; s;}));
1376 }
1377 usb_put_urb (urb);
1378
1379 /* list contents may have changed */
1380 goto rescan;
1381 }
1382 spin_unlock (&hcd_data_lock);
1383 local_irq_enable ();
1384
1385 /* synchronize with the hardware, so old configuration state
1386 * clears out immediately (and will be freed).
1387 */
1388 might_sleep ();
1389 if (hcd->driver->endpoint_disable)
1390 hcd->driver->endpoint_disable (hcd, ep);
455b25fb
AS		 1391
1392 /* Wait until the endpoint queue is completely empty. Most HCDs
1393 * will have done this already in their endpoint_disable method,
1394 * but some might not. And there could be root-hub control URBs
1395 * still pending since they aren't affected by the HCDs'
1396 * endpoint_disable methods.
1397 */
1398 while (!list_empty (&ep->urb_list)) {
1399 spin_lock_irq (&hcd_data_lock);
1400
1401 /* The list may have changed while we acquired the spinlock */
1402 urb = NULL;
1403 if (!list_empty (&ep->urb_list)) {
1404 urb = list_entry (ep->urb_list.prev, struct urb,
1405 urb_list);
1406 usb_get_urb (urb);
1407 }
1408 spin_unlock_irq (&hcd_data_lock);
1409
1410 if (urb) {
1411 usb_kill_urb (urb);
1412 usb_put_urb (urb);
1413 }
1414 }
1da177e4
LT		 1415}
1416
1417/*-------------------------------------------------------------------------*/
1418
9293677a 1419#ifdef CONFIG_PM
1da177e4 1420
0c0382e3 1421int hcd_bus_suspend (struct usb_bus *bus)
1da177e4
LT		 1422{
1423 struct usb_hcd *hcd;
9293677a 1424 int status;
1da177e4
LT		 1425
1426 hcd = container_of (bus, struct usb_hcd, self);
0c0382e3 1427 if (!hcd->driver->bus_suspend)
9293677a
DB		 1428 return -ENOENT;
1429 hcd->state = HC_STATE_QUIESCING;
0c0382e3 1430 status = hcd->driver->bus_suspend (hcd);
9293677a
DB		 1431 if (status == 0)
1432 hcd->state = HC_STATE_SUSPENDED;
1433 else
1434 dev_dbg(&bus->root_hub->dev, "%s fail, err %d\n",
1435 "suspend", status);
1436 return status;
1da177e4
LT		 1437}
1438
0c0382e3 1439int hcd_bus_resume (struct usb_bus *bus)
1da177e4
LT		 1440{
1441 struct usb_hcd *hcd;
9293677a 1442 int status;
1da177e4
LT		 1443
1444 hcd = container_of (bus, struct usb_hcd, self);
0c0382e3 1445 if (!hcd->driver->bus_resume)
9293677a 1446 return -ENOENT;
979d5199
DB		 1447 if (hcd->state == HC_STATE_RUNNING)
1448 return 0;
9293677a 1449 hcd->state = HC_STATE_RESUMING;
0c0382e3 1450 status = hcd->driver->bus_resume (hcd);
9293677a
DB		 1451 if (status == 0)
1452 hcd->state = HC_STATE_RUNNING;
1453 else {
1454 dev_dbg(&bus->root_hub->dev, "%s fail, err %d\n",
1455 "resume", status);
1456 usb_hc_died(hcd);
1457 }
1458 return status;
1da177e4
LT		 1459}
1460
979d5199
DB		 1461/*
1462 * usb_hcd_suspend_root_hub - HCD autosuspends downstream ports
1463 * @hcd: host controller for this root hub
1464 *
1465 * This call arranges that usb_hcd_resume_root_hub() is safe to call later;
1466 * that the HCD's root hub polling is deactivated; and that the root's hub
1467 * driver is suspended. HCDs may call this to autosuspend when their root
1468 * hub's downstream ports are all inactive: unpowered, disconnected,
1469 * disabled, or suspended.
1470 *
1471 * The HCD will autoresume on device connect change detection (using SRP
1472 * or a D+/D- pullup). The HCD also autoresumes on remote wakeup signaling
1473 * from any ports that are suspended (if that is enabled). In most cases,
1474 * overcurrent signaling (on powered ports) will also start autoresume.
1475 *
1476 * Always called with IRQs blocked.
1477 */
1478void usb_hcd_suspend_root_hub (struct usb_hcd *hcd)
1479{
1480 struct urb *urb;
1481
1482 spin_lock (&hcd_root_hub_lock);
1483 usb_suspend_root_hub (hcd->self.root_hub);
1484
1485 /* force status urb to complete/unlink while suspended */
1486 if (hcd->status_urb) {
1487 urb = hcd->status_urb;
1488 urb->status = -ECONNRESET;
1489 urb->hcpriv = NULL;
1490 urb->actual_length = 0;
1491
1492 del_timer (&hcd->rh_timer);
1493 hcd->poll_pending = 0;
1494 hcd->status_urb = NULL;
1495 } else
1496 urb = NULL;
1497 spin_unlock (&hcd_root_hub_lock);
1498 hcd->state = HC_STATE_SUSPENDED;
1499
1500 if (urb)
1501 usb_hcd_giveback_urb (hcd, urb, NULL);
1502}
1503EXPORT_SYMBOL_GPL(usb_hcd_suspend_root_hub);
1504
1da177e4
LT		 1505/**
1506 * usb_hcd_resume_root_hub - called by HCD to resume its root hub
1507 * @hcd: host controller for this root hub
1508 *
1509 * The USB host controller calls this function when its root hub is
1510 * suspended (with the remote wakeup feature enabled) and a remote
1511 * wakeup request is received. It queues a request for khubd to
979d5199 1512 * resume the root hub (that is, manage its downstream ports again).
1da177e4
LT		 1513 */
1514void usb_hcd_resume_root_hub (struct usb_hcd *hcd)
1515{
1516 unsigned long flags;
1517
1518 spin_lock_irqsave (&hcd_root_hub_lock, flags);
1519 if (hcd->rh_registered)
1520 usb_resume_root_hub (hcd->self.root_hub);
1521 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
1522}
9293677a 1523EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub);
1da177e4 1524
1da177e4 1525#endif
1da177e4
LT		 1526
1527/*-------------------------------------------------------------------------*/
1528
1529#ifdef CONFIG_USB_OTG
1530
1531/**
1532 * usb_bus_start_enum - start immediate enumeration (for OTG)
1533 * @bus: the bus (must use hcd framework)
1534 * @port_num: 1-based number of port; usually bus->otg_port
1535 * Context: in_interrupt()
1536 *
1537 * Starts enumeration, with an immediate reset followed later by
1538 * khubd identifying and possibly configuring the device.
1539 * This is needed by OTG controller drivers, where it helps meet
1540 * HNP protocol timing requirements for starting a port reset.
1541 */
1542int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num)
1543{
1544 struct usb_hcd *hcd;
1545 int status = -EOPNOTSUPP;
1546
1547 /* NOTE: since HNP can't start by grabbing the bus's address0_sem,
1548 * boards with root hubs hooked up to internal devices (instead of
1549 * just the OTG port) may need more attention to resetting...
1550 */
1551 hcd = container_of (bus, struct usb_hcd, self);
1552 if (port_num && hcd->driver->start_port_reset)
1553 status = hcd->driver->start_port_reset(hcd, port_num);
1554
1555 /* run khubd shortly after (first) root port reset finishes;
1556 * it may issue others, until at least 50 msecs have passed.
1557 */
1558 if (status == 0)
1559 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10));
1560 return status;
1561}
1562EXPORT_SYMBOL (usb_bus_start_enum);
1563
1564#endif
1565
1566/*-------------------------------------------------------------------------*/
1567
1da177e4
LT		 1568/**
1569 * usb_hcd_giveback_urb - return URB from HCD to device driver
1570 * @hcd: host controller returning the URB
1571 * @urb: urb being returned to the USB device driver.
1572 * @regs: pt_regs, passed down to the URB completion handler
1573 * Context: in_interrupt()
1574 *
1575 * This hands the URB from HCD to its USB device driver, using its
1576 * completion function. The HCD has freed all per-urb resources
1577 * (and is done using urb->hcpriv). It also released all HCD locks;
1578 * the device driver won't cause problems if it frees, modifies,
1579 * or resubmits this URB.
1580 */
1581void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb, struct pt_regs *regs)
1582{
1583 int at_root_hub;
1584
1585 at_root_hub = (urb->dev == hcd->self.root_hub);
1586 urb_unlink (urb);
1587
dd990f16
AS		 1588 /* lower level hcd code should use *_dma exclusively if the
1589 * host controller does DMA */
1590 if (hcd->self.uses_dma && !at_root_hub) {
1da177e4
LT		 1591 if (usb_pipecontrol (urb->pipe)
1592 && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
1593 dma_unmap_single (hcd->self.controller, urb->setup_dma,
1594 sizeof (struct usb_ctrlrequest),
1595 DMA_TO_DEVICE);
1596 if (urb->transfer_buffer_length != 0
1597 && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP))
1598 dma_unmap_single (hcd->self.controller,
1599 urb->transfer_dma,
1600 urb->transfer_buffer_length,
1601 usb_pipein (urb->pipe)
1602 ? DMA_FROM_DEVICE
1603 : DMA_TO_DEVICE);
1604 }
1605
1606 usbmon_urb_complete (&hcd->self, urb);
1607 /* pass ownership to the completion handler */
1608 urb->complete (urb, regs);
1609 atomic_dec (&urb->use_count);
1610 if (unlikely (urb->reject))
1611 wake_up (&usb_kill_urb_queue);
1612 usb_put_urb (urb);
1613}
1614EXPORT_SYMBOL (usb_hcd_giveback_urb);
1615
1616/*-------------------------------------------------------------------------*/
1617
1618/**
1619 * usb_hcd_irq - hook IRQs to HCD framework (bus glue)
1620 * @irq: the IRQ being raised
1621 * @__hcd: pointer to the HCD whose IRQ is being signaled
1622 * @r: saved hardware registers
1623 *
1624 * If the controller isn't HALTed, calls the driver's irq handler.
1625 * Checks whether the controller is now dead.
1626 */
1627irqreturn_t usb_hcd_irq (int irq, void *__hcd, struct pt_regs * r)
1628{
1629 struct usb_hcd *hcd = __hcd;
1630 int start = hcd->state;
1631
8de98402
BH		 1632 if (unlikely(start == HC_STATE_HALT ||
1633 !test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
1da177e4
LT		 1634 return IRQ_NONE;
1635 if (hcd->driver->irq (hcd, r) == IRQ_NONE)
1636 return IRQ_NONE;
1637
8de98402
BH		 1638 set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
1639
1640 if (unlikely(hcd->state == HC_STATE_HALT))
1da177e4
LT		 1641 usb_hc_died (hcd);
1642 return IRQ_HANDLED;
1643}
1644
1645/*-------------------------------------------------------------------------*/
1646
1647/**
1648 * usb_hc_died - report abnormal shutdown of a host controller (bus glue)
1649 * @hcd: pointer to the HCD representing the controller
1650 *
1651 * This is called by bus glue to report a USB host controller that died
1652 * while operations may still have been pending. It's called automatically
1653 * by the PCI glue, so only glue for non-PCI busses should need to call it.
1654 */
1655void usb_hc_died (struct usb_hcd *hcd)
1656{
1657 unsigned long flags;
1658
1659 dev_err (hcd->self.controller, "HC died; cleaning up\n");
1660
1661 spin_lock_irqsave (&hcd_root_hub_lock, flags);
1662 if (hcd->rh_registered) {
d5926ae7 1663 hcd->poll_rh = 0;
1da177e4
LT		 1664
1665 /* make khubd clean up old urbs and devices */
1666 usb_set_device_state (hcd->self.root_hub,
1667 USB_STATE_NOTATTACHED);
1668 usb_kick_khubd (hcd->self.root_hub);
1669 }
1670 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
1671}
1672EXPORT_SYMBOL_GPL (usb_hc_died);
1673
1674/*-------------------------------------------------------------------------*/
1675
1676static void hcd_release (struct usb_bus *bus)
1677{
1678 struct usb_hcd *hcd;
1679
1680 hcd = container_of(bus, struct usb_hcd, self);
1681 kfree(hcd);
1682}
1683
1684/**
1685 * usb_create_hcd - create and initialize an HCD structure
1686 * @driver: HC driver that will use this hcd
1687 * @dev: device for this HC, stored in hcd->self.controller
1688 * @bus_name: value to store in hcd->self.bus_name
1689 * Context: !in_interrupt()
1690 *
1691 * Allocate a struct usb_hcd, with extra space at the end for the
1692 * HC driver's private data. Initialize the generic members of the
1693 * hcd structure.
1694 *
1695 * If memory is unavailable, returns NULL.
1696 */
1697struct usb_hcd *usb_create_hcd (const struct hc_driver *driver,
1698 struct device *dev, char *bus_name)
1699{
1700 struct usb_hcd *hcd;
1701
7b842b6e 1702 hcd = kzalloc(sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL);
1da177e4
LT		 1703 if (!hcd) {
1704 dev_dbg (dev, "hcd alloc failed\n");
1705 return NULL;
1706 }
1707 dev_set_drvdata(dev, hcd);
1708
1709 usb_bus_init(&hcd->self);
1da177e4
LT		 1710 hcd->self.hcpriv = hcd;
1711 hcd->self.release = &hcd_release;
1712 hcd->self.controller = dev;
1713 hcd->self.bus_name = bus_name;
dd990f16 1714 hcd->self.uses_dma = (dev->dma_mask != NULL);
1da177e4
LT		 1715
1716 init_timer(&hcd->rh_timer);
d5926ae7
AS		 1717 hcd->rh_timer.function = rh_timer_func;
1718 hcd->rh_timer.data = (unsigned long) hcd;
1da177e4
LT		 1719
1720 hcd->driver = driver;
1721 hcd->product_desc = (driver->product_desc) ? driver->product_desc :
1722 "USB Host Controller";
1723
1724 return hcd;
1725}
1726EXPORT_SYMBOL (usb_create_hcd);
1727
1728void usb_put_hcd (struct usb_hcd *hcd)
1729{
1730 dev_set_drvdata(hcd->self.controller, NULL);
1731 usb_bus_put(&hcd->self);
1732}
1733EXPORT_SYMBOL (usb_put_hcd);
1734
1735/**
1736 * usb_add_hcd - finish generic HCD structure initialization and register
1737 * @hcd: the usb_hcd structure to initialize
1738 * @irqnum: Interrupt line to allocate
1739 * @irqflags: Interrupt type flags
1740 *
1741 * Finish the remaining parts of generic HCD initialization: allocate the
1742 * buffers of consistent memory, register the bus, request the IRQ line,
1743 * and call the driver's reset() and start() routines.
1744 */
1745int usb_add_hcd(struct usb_hcd *hcd,
1746 unsigned int irqnum, unsigned long irqflags)
1747{
8ec8d20b
AS		 1748 int retval;
1749 struct usb_device *rhdev;
1da177e4
LT		 1750
1751 dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
1752
8de98402
BH		 1753 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1754
b1e8f0a6
DB		 1755 /* HC is in reset state, but accessible. Now do the one-time init,
1756 * bottom up so that hcds can customize the root hubs before khubd
1757 * starts talking to them. (Note, bus id is assigned early too.)
1758 */
1da177e4
LT		 1759 if ((retval = hcd_buffer_create(hcd)) != 0) {
1760 dev_dbg(hcd->self.controller, "pool alloc failed\n");
1761 return retval;
1762 }
1763
1764 if ((retval = usb_register_bus(&hcd->self)) < 0)
8ec8d20b 1765 goto err_register_bus;
1da177e4 1766
b1e8f0a6
DB		 1767 if ((rhdev = usb_alloc_dev(NULL, &hcd->self, 0)) == NULL) {
1768 dev_err(hcd->self.controller, "unable to allocate root hub\n");
1769 retval = -ENOMEM;
1770 goto err_allocate_root_hub;
1771 }
1772 rhdev->speed = (hcd->driver->flags & HCD_USB2) ? USB_SPEED_HIGH :
1773 USB_SPEED_FULL;
1774 hcd->self.root_hub = rhdev;
1775
db4cefaa
DB		 1776 /* wakeup flag init defaults to "everything works" for root hubs,
1777 * but drivers can override it in reset() if needed, along with
1778 * recording the overall controller's system wakeup capability.
1779 */
1780 device_init_wakeup(&rhdev->dev, 1);
1781
b1e8f0a6
DB		 1782 /* "reset" is misnamed; its role is now one-time init. the controller
1783 * should already have been reset (and boot firmware kicked off etc).
1784 */
1785 if (hcd->driver->reset && (retval = hcd->driver->reset(hcd)) < 0) {
1786 dev_err(hcd->self.controller, "can't setup\n");
1787 goto err_hcd_driver_setup;
1788 }
1789
fb669cc0
DB		 1790 /* NOTE: root hub and controller capabilities may not be the same */
1791 if (device_can_wakeup(hcd->self.controller)
1792 && device_can_wakeup(&hcd->self.root_hub->dev))
b1e8f0a6 1793 dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
b1e8f0a6
DB		 1794
1795 /* enable irqs just before we start the controller */
1da177e4 1796 if (hcd->driver->irq) {
1da177e4
LT		 1797 snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d",
1798 hcd->driver->description, hcd->self.busnum);
1799 if ((retval = request_irq(irqnum, &usb_hcd_irq, irqflags,
1800 hcd->irq_descr, hcd)) != 0) {
1801 dev_err(hcd->self.controller,
c6387a48 1802 "request interrupt %d failed\n", irqnum);
8ec8d20b 1803 goto err_request_irq;
1da177e4
LT		 1804 }
1805 hcd->irq = irqnum;
c6387a48 1806 dev_info(hcd->self.controller, "irq %d, %s 0x%08llx\n", irqnum,
1da177e4
LT		 1807 (hcd->driver->flags & HCD_MEMORY) ?
1808 "io mem" : "io base",
1809 (unsigned long long)hcd->rsrc_start);
1810 } else {
1811 hcd->irq = -1;
1812 if (hcd->rsrc_start)
1813 dev_info(hcd->self.controller, "%s 0x%08llx\n",
1814 (hcd->driver->flags & HCD_MEMORY) ?
1815 "io mem" : "io base",
1816 (unsigned long long)hcd->rsrc_start);
1817 }
1818
1819 if ((retval = hcd->driver->start(hcd)) < 0) {
1820 dev_err(hcd->self.controller, "startup error %d\n", retval);
8ec8d20b 1821 goto err_hcd_driver_start;
1da177e4
LT		 1822 }
1823
b1e8f0a6 1824 /* starting here, usbcore will pay attention to this root hub */
55c52718 1825 rhdev->bus_mA = min(500u, hcd->power_budget);
b1e8f0a6 1826 if ((retval = register_root_hub(hcd)) != 0)
8ec8d20b
AS		 1827 goto err_register_root_hub;
1828
d5926ae7
AS		 1829 if (hcd->uses_new_polling && hcd->poll_rh)
1830 usb_hcd_poll_rh_status(hcd);
1da177e4
LT		 1831 return retval;
1832
b1e8f0a6 1833err_register_root_hub:
8ec8d20b 1834 hcd->driver->stop(hcd);
b1e8f0a6 1835err_hcd_driver_start:
1da177e4
LT		 1836 if (hcd->irq >= 0)
1837 free_irq(irqnum, hcd);
b1e8f0a6
DB		 1838err_request_irq:
1839err_hcd_driver_setup:
1840 hcd->self.root_hub = NULL;
1841 usb_put_dev(rhdev);
1842err_allocate_root_hub:
1da177e4 1843 usb_deregister_bus(&hcd->self);
b1e8f0a6 1844err_register_bus:
1da177e4
LT		 1845 hcd_buffer_destroy(hcd);
1846 return retval;
1847}
1848EXPORT_SYMBOL (usb_add_hcd);
1849
1850/**
1851 * usb_remove_hcd - shutdown processing for generic HCDs
1852 * @hcd: the usb_hcd structure to remove
1853 * Context: !in_interrupt()
1854 *
1855 * Disconnects the root hub, then reverses the effects of usb_add_hcd(),
1856 * invoking the HCD's stop() method.
1857 */
1858void usb_remove_hcd(struct usb_hcd *hcd)
1859{
1860 dev_info(hcd->self.controller, "remove, state %x\n", hcd->state);
1861
1862 if (HC_IS_RUNNING (hcd->state))
1863 hcd->state = HC_STATE_QUIESCING;
1864
1865 dev_dbg(hcd->self.controller, "roothub graceful disconnect\n");
1866 spin_lock_irq (&hcd_root_hub_lock);
1867 hcd->rh_registered = 0;
1868 spin_unlock_irq (&hcd_root_hub_lock);
9ad3d6cc 1869
4186ecf8 1870 mutex_lock(&usb_bus_list_lock);
1da177e4 1871 usb_disconnect(&hcd->self.root_hub);
4186ecf8 1872 mutex_unlock(&usb_bus_list_lock);
1da177e4 1873
d5926ae7
AS		 1874 hcd->poll_rh = 0;
1875 del_timer_sync(&hcd->rh_timer);
1876
1da177e4
LT		 1877 hcd->driver->stop(hcd);
1878 hcd->state = HC_STATE_HALT;
1879
1880 if (hcd->irq >= 0)
1881 free_irq(hcd->irq, hcd);
1882 usb_deregister_bus(&hcd->self);
1883 hcd_buffer_destroy(hcd);
1884}
1885EXPORT_SYMBOL (usb_remove_hcd);
1886
64a21d02
AG		 1887void
1888usb_hcd_platform_shutdown(struct platform_device* dev)
1889{
1890 struct usb_hcd *hcd = platform_get_drvdata(dev);
1891
1892 if (hcd->driver->shutdown)
1893 hcd->driver->shutdown(hcd);
1894}
1895EXPORT_SYMBOL (usb_hcd_platform_shutdown);
1896
1da177e4
LT		 1897/*-------------------------------------------------------------------------*/
1898
4749f32d 1899#if defined(CONFIG_USB_MON)
1da177e4
LT		 1900
1901struct usb_mon_operations *mon_ops;
1902
1903/*
1904 * The registration is unlocked.
1905 * We do it this way because we do not want to lock in hot paths.
1906 *
1907 * Notice that the code is minimally error-proof. Because usbmon needs
1908 * symbols from usbcore, usbcore gets referenced and cannot be unloaded first.
1909 */
1910
1911int usb_mon_register (struct usb_mon_operations *ops)
1912{
1913
1914 if (mon_ops)
1915 return -EBUSY;
1916
1917 mon_ops = ops;
1918 mb();
1919 return 0;
1920}
1921EXPORT_SYMBOL_GPL (usb_mon_register);
1922
1923void usb_mon_deregister (void)
1924{
1925
1926 if (mon_ops == NULL) {
1927 printk(KERN_ERR "USB: monitor was not registered\n");
1928 return;
1929 }
1930 mon_ops = NULL;
1931 mb();
1932}
1933EXPORT_SYMBOL_GPL (usb_mon_deregister);
1934
1935#endif /* CONFIG_USB_MON */
kernel source for telekom puls (alcatel/mediatek)