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usbcore: trim down usb_bus structure
[deliverable/linux.git] / drivers / usb / core / hcd.c
CommitLineData
1da177e4
LT		 1/*
2 * (C) Copyright Linus Torvalds 1999
3 * (C) Copyright Johannes Erdfelt 1999-2001
4 * (C) Copyright Andreas Gal 1999
5 * (C) Copyright Gregory P. Smith 1999
6 * (C) Copyright Deti Fliegl 1999
7 * (C) Copyright Randy Dunlap 2000
8 * (C) Copyright David Brownell 2000-2002
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 * for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
1da177e4
LT		 25#include <linux/module.h>
26#include <linux/version.h>
27#include <linux/kernel.h>
28#include <linux/slab.h>
29#include <linux/completion.h>
30#include <linux/utsname.h>
31#include <linux/mm.h>
32#include <asm/io.h>
33#include <asm/scatterlist.h>
34#include <linux/device.h>
35#include <linux/dma-mapping.h>
4186ecf8 36#include <linux/mutex.h>
1da177e4
LT		 37#include <asm/irq.h>
38#include <asm/byteorder.h>
64a21d02 39#include <linux/platform_device.h>
1da177e4
LT		 40
41#include <linux/usb.h>
42
43#include "usb.h"
44#include "hcd.h"
45#include "hub.h"
46
47
48// #define USB_BANDWIDTH_MESSAGES
49
50/*-------------------------------------------------------------------------*/
51
52/*
53 * USB Host Controller Driver framework
54 *
55 * Plugs into usbcore (usb_bus) and lets HCDs share code, minimizing
56 * HCD-specific behaviors/bugs.
57 *
58 * This does error checks, tracks devices and urbs, and delegates to a
59 * "hc_driver" only for code (and data) that really needs to know about
60 * hardware differences. That includes root hub registers, i/o queues,
61 * and so on ... but as little else as possible.
62 *
63 * Shared code includes most of the "root hub" code (these are emulated,
64 * though each HC's hardware works differently) and PCI glue, plus request
65 * tracking overhead. The HCD code should only block on spinlocks or on
66 * hardware handshaking; blocking on software events (such as other kernel
67 * threads releasing resources, or completing actions) is all generic.
68 *
69 * Happens the USB 2.0 spec says this would be invisible inside the "USBD",
70 * and includes mostly a "HCDI" (HCD Interface) along with some APIs used
71 * only by the hub driver ... and that neither should be seen or used by
72 * usb client device drivers.
73 *
74 * Contributors of ideas or unattributed patches include: David Brownell,
75 * Roman Weissgaerber, Rory Bolt, Greg Kroah-Hartman, ...
76 *
77 * HISTORY:
78 * 2002-02-21 Pull in most of the usb_bus support from usb.c; some
79 * associated cleanup. "usb_hcd" still != "usb_bus".
80 * 2001-12-12 Initial patch version for Linux 2.5.1 kernel.
81 */
82
83/*-------------------------------------------------------------------------*/
84
85/* host controllers we manage */
86LIST_HEAD (usb_bus_list);
87EXPORT_SYMBOL_GPL (usb_bus_list);
88
89/* used when allocating bus numbers */
90#define USB_MAXBUS 64
91struct usb_busmap {
92 unsigned long busmap [USB_MAXBUS / (8*sizeof (unsigned long))];
93};
94static struct usb_busmap busmap;
95
96/* used when updating list of hcds */
4186ecf8 97DEFINE_MUTEX(usb_bus_list_lock); /* exported only for usbfs */
1da177e4
LT		 98EXPORT_SYMBOL_GPL (usb_bus_list_lock);
99
100/* used for controlling access to virtual root hubs */
101static DEFINE_SPINLOCK(hcd_root_hub_lock);
102
103/* used when updating hcd data */
104static DEFINE_SPINLOCK(hcd_data_lock);
105
106/* wait queue for synchronous unlinks */
107DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue);
108
109/*-------------------------------------------------------------------------*/
110
111/*
112 * Sharable chunks of root hub code.
113 */
114
115/*-------------------------------------------------------------------------*/
116
117#define KERNEL_REL ((LINUX_VERSION_CODE >> 16) & 0x0ff)
118#define KERNEL_VER ((LINUX_VERSION_CODE >> 8) & 0x0ff)
119
120/* usb 2.0 root hub device descriptor */
121static const u8 usb2_rh_dev_descriptor [18] = {
122 0x12, /* __u8 bLength; */
123 0x01, /* __u8 bDescriptorType; Device */
124 0x00, 0x02, /* __le16 bcdUSB; v2.0 */
125
126 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
127 0x00, /* __u8 bDeviceSubClass; */
128 0x01, /* __u8 bDeviceProtocol; [ usb 2.0 single TT ]*/
16f16d11 129 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
1da177e4
LT		 130
131 0x00, 0x00, /* __le16 idVendor; */
132 0x00, 0x00, /* __le16 idProduct; */
133 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
134
135 0x03, /* __u8 iManufacturer; */
136 0x02, /* __u8 iProduct; */
137 0x01, /* __u8 iSerialNumber; */
138 0x01 /* __u8 bNumConfigurations; */
139};
140
141/* no usb 2.0 root hub "device qualifier" descriptor: one speed only */
142
143/* usb 1.1 root hub device descriptor */
144static const u8 usb11_rh_dev_descriptor [18] = {
145 0x12, /* __u8 bLength; */
146 0x01, /* __u8 bDescriptorType; Device */
147 0x10, 0x01, /* __le16 bcdUSB; v1.1 */
148
149 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
150 0x00, /* __u8 bDeviceSubClass; */
151 0x00, /* __u8 bDeviceProtocol; [ low/full speeds only ] */
16f16d11 152 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
1da177e4
LT		 153
154 0x00, 0x00, /* __le16 idVendor; */
155 0x00, 0x00, /* __le16 idProduct; */
156 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
157
158 0x03, /* __u8 iManufacturer; */
159 0x02, /* __u8 iProduct; */
160 0x01, /* __u8 iSerialNumber; */
161 0x01 /* __u8 bNumConfigurations; */
162};
163
164
165/*-------------------------------------------------------------------------*/
166
167/* Configuration descriptors for our root hubs */
168
169static const u8 fs_rh_config_descriptor [] = {
170
171 /* one configuration */
172 0x09, /* __u8 bLength; */
173 0x02, /* __u8 bDescriptorType; Configuration */
174 0x19, 0x00, /* __le16 wTotalLength; */
175 0x01, /* __u8 bNumInterfaces; (1) */
176 0x01, /* __u8 bConfigurationValue; */
177 0x00, /* __u8 iConfiguration; */
178 0xc0, /* __u8 bmAttributes;
179 Bit 7: must be set,
180 6: Self-powered,
181 5: Remote wakeup,
182 4..0: resvd */
183 0x00, /* __u8 MaxPower; */
184
185 /* USB 1.1:
186 * USB 2.0, single TT organization (mandatory):
187 * one interface, protocol 0
188 *
189 * USB 2.0, multiple TT organization (optional):
190 * two interfaces, protocols 1 (like single TT)
191 * and 2 (multiple TT mode) ... config is
192 * sometimes settable
193 * NOT IMPLEMENTED
194 */
195
196 /* one interface */
197 0x09, /* __u8 if_bLength; */
198 0x04, /* __u8 if_bDescriptorType; Interface */
199 0x00, /* __u8 if_bInterfaceNumber; */
200 0x00, /* __u8 if_bAlternateSetting; */
201 0x01, /* __u8 if_bNumEndpoints; */
202 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
203 0x00, /* __u8 if_bInterfaceSubClass; */
204 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
205 0x00, /* __u8 if_iInterface; */
206
207 /* one endpoint (status change endpoint) */
208 0x07, /* __u8 ep_bLength; */
209 0x05, /* __u8 ep_bDescriptorType; Endpoint */
210 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
211 0x03, /* __u8 ep_bmAttributes; Interrupt */
212 0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */
213 0xff /* __u8 ep_bInterval; (255ms -- usb 2.0 spec) */
214};
215
216static const u8 hs_rh_config_descriptor [] = {
217
218 /* one configuration */
219 0x09, /* __u8 bLength; */
220 0x02, /* __u8 bDescriptorType; Configuration */
221 0x19, 0x00, /* __le16 wTotalLength; */
222 0x01, /* __u8 bNumInterfaces; (1) */
223 0x01, /* __u8 bConfigurationValue; */
224 0x00, /* __u8 iConfiguration; */
225 0xc0, /* __u8 bmAttributes;
226 Bit 7: must be set,
227 6: Self-powered,
228 5: Remote wakeup,
229 4..0: resvd */
230 0x00, /* __u8 MaxPower; */
231
232 /* USB 1.1:
233 * USB 2.0, single TT organization (mandatory):
234 * one interface, protocol 0
235 *
236 * USB 2.0, multiple TT organization (optional):
237 * two interfaces, protocols 1 (like single TT)
238 * and 2 (multiple TT mode) ... config is
239 * sometimes settable
240 * NOT IMPLEMENTED
241 */
242
243 /* one interface */
244 0x09, /* __u8 if_bLength; */
245 0x04, /* __u8 if_bDescriptorType; Interface */
246 0x00, /* __u8 if_bInterfaceNumber; */
247 0x00, /* __u8 if_bAlternateSetting; */
248 0x01, /* __u8 if_bNumEndpoints; */
249 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
250 0x00, /* __u8 if_bInterfaceSubClass; */
251 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
252 0x00, /* __u8 if_iInterface; */
253
254 /* one endpoint (status change endpoint) */
255 0x07, /* __u8 ep_bLength; */
256 0x05, /* __u8 ep_bDescriptorType; Endpoint */
257 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
258 0x03, /* __u8 ep_bmAttributes; Interrupt */
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
8561b10f 667static struct class *usb_host_class;
1da177e4
LT		 668
669int usb_host_init(void)
670{
8561b10f 671 int retval = 0;
672
673 usb_host_class = class_create(THIS_MODULE, "usb_host");
674 if (IS_ERR(usb_host_class))
675 retval = PTR_ERR(usb_host_class);
676 return retval;
1da177e4
LT		 677}
678
679void usb_host_cleanup(void)
680{
8561b10f 681 class_destroy(usb_host_class);
1da177e4
LT		 682}
683
684/**
685 * usb_bus_init - shared initialization code
686 * @bus: the bus structure being initialized
687 *
688 * This code is used to initialize a usb_bus structure, memory for which is
689 * separately managed.
690 */
691static void usb_bus_init (struct usb_bus *bus)
692{
693 memset (&bus->devmap, 0, sizeof(struct usb_devmap));
694
695 bus->devnum_next = 1;
696
697 bus->root_hub = NULL;
1da177e4
LT		 698 bus->busnum = -1;
699 bus->bandwidth_allocated = 0;
700 bus->bandwidth_int_reqs = 0;
701 bus->bandwidth_isoc_reqs = 0;
702
703 INIT_LIST_HEAD (&bus->bus_list);
1da177e4
LT		 704}
705
1da177e4
LT		 706/*-------------------------------------------------------------------------*/
707
708/**
709 * usb_register_bus - registers the USB host controller with the usb core
710 * @bus: pointer to the bus to register
711 * Context: !in_interrupt()
712 *
713 * Assigns a bus number, and links the controller into usbcore data
714 * structures so that it can be seen by scanning the bus list.
715 */
716static int usb_register_bus(struct usb_bus *bus)
717{
718 int busnum;
1da177e4 719
4186ecf8 720 mutex_lock(&usb_bus_list_lock);
1da177e4
LT		 721 busnum = find_next_zero_bit (busmap.busmap, USB_MAXBUS, 1);
722 if (busnum < USB_MAXBUS) {
723 set_bit (busnum, busmap.busmap);
724 bus->busnum = busnum;
725 } else {
726 printk (KERN_ERR "%s: too many buses\n", usbcore_name);
4186ecf8 727 mutex_unlock(&usb_bus_list_lock);
1da177e4
LT		 728 return -E2BIG;
729 }
730
53f46542
GKH		 731 bus->class_dev = class_device_create(usb_host_class, NULL, MKDEV(0,0),
732 bus->controller, "usb_host%d", busnum);
8561b10f 733 if (IS_ERR(bus->class_dev)) {
1da177e4 734 clear_bit(busnum, busmap.busmap);
4186ecf8 735 mutex_unlock(&usb_bus_list_lock);
8561b10f 736 return PTR_ERR(bus->class_dev);
1da177e4
LT		 737 }
738
8561b10f 739 class_set_devdata(bus->class_dev, bus);
740
1da177e4
LT		 741 /* Add it to the local list of buses */
742 list_add (&bus->bus_list, &usb_bus_list);
4186ecf8 743 mutex_unlock(&usb_bus_list_lock);
1da177e4 744
3099e75a 745 usb_notify_add_bus(bus);
1da177e4
LT		 746
747 dev_info (bus->controller, "new USB bus registered, assigned bus number %d\n", bus->busnum);
748 return 0;
749}
750
751/**
752 * usb_deregister_bus - deregisters the USB host controller
753 * @bus: pointer to the bus to deregister
754 * Context: !in_interrupt()
755 *
756 * Recycles the bus number, and unlinks the controller from usbcore data
757 * structures so that it won't be seen by scanning the bus list.
758 */
759static void usb_deregister_bus (struct usb_bus *bus)
760{
761 dev_info (bus->controller, "USB bus %d deregistered\n", bus->busnum);
762
763 /*
764 * NOTE: make sure that all the devices are removed by the
765 * controller code, as well as having it call this when cleaning
766 * itself up
767 */
4186ecf8 768 mutex_lock(&usb_bus_list_lock);
1da177e4 769 list_del (&bus->bus_list);
4186ecf8 770 mutex_unlock(&usb_bus_list_lock);
1da177e4 771
3099e75a 772 usb_notify_remove_bus(bus);
1da177e4
LT		 773
774 clear_bit (bus->busnum, busmap.busmap);
775
8561b10f 776 class_device_unregister(bus->class_dev);
1da177e4
LT		 777}
778
779/**
8ec8d20b 780 * register_root_hub - called by usb_add_hcd() to register a root hub
1da177e4
LT		 781 * @hcd: host controller for this root hub
782 *
8ec8d20b 783 * This function registers the root hub with the USB subsystem. It sets up
b1e8f0a6
DB		 784 * the device properly in the device tree and then calls usb_new_device()
785 * to register the usb device. It also assigns the root hub's USB address
786 * (always 1).
1da177e4 787 */
b1e8f0a6 788static int register_root_hub(struct usb_hcd *hcd)
1da177e4
LT		 789{
790 struct device *parent_dev = hcd->self.controller;
b1e8f0a6 791 struct usb_device *usb_dev = hcd->self.root_hub;
1da177e4
LT		 792 const int devnum = 1;
793 int retval;
794
1da177e4
LT		 795 usb_dev->devnum = devnum;
796 usb_dev->bus->devnum_next = devnum + 1;
797 memset (&usb_dev->bus->devmap.devicemap, 0,
798 sizeof usb_dev->bus->devmap.devicemap);
799 set_bit (devnum, usb_dev->bus->devmap.devicemap);
800 usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
801
4186ecf8 802 mutex_lock(&usb_bus_list_lock);
1da177e4
LT		 803
804 usb_dev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
805 retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE);
806 if (retval != sizeof usb_dev->descriptor) {
4186ecf8 807 mutex_unlock(&usb_bus_list_lock);
1da177e4
LT		 808 dev_dbg (parent_dev, "can't read %s device descriptor %d\n",
809 usb_dev->dev.bus_id, retval);
810 return (retval < 0) ? retval : -EMSGSIZE;
811 }
812
1da177e4 813 retval = usb_new_device (usb_dev);
1da177e4 814 if (retval) {
1da177e4
LT		 815 dev_err (parent_dev, "can't register root hub for %s, %d\n",
816 usb_dev->dev.bus_id, retval);
817 }
4186ecf8 818 mutex_unlock(&usb_bus_list_lock);
1da177e4
LT		 819
820 if (retval == 0) {
821 spin_lock_irq (&hcd_root_hub_lock);
822 hcd->rh_registered = 1;
823 spin_unlock_irq (&hcd_root_hub_lock);
824
825 /* Did the HC die before the root hub was registered? */
826 if (hcd->state == HC_STATE_HALT)
827 usb_hc_died (hcd); /* This time clean up */
828 }
829
830 return retval;
831}
1da177e4 832
d5926ae7
AS		 833void usb_enable_root_hub_irq (struct usb_bus *bus)
834{
835 struct usb_hcd *hcd;
836
837 hcd = container_of (bus, struct usb_hcd, self);
838 if (hcd->driver->hub_irq_enable && !hcd->poll_rh &&
839 hcd->state != HC_STATE_HALT)
840 hcd->driver->hub_irq_enable (hcd);
841}
842
1da177e4
LT		 843
844/*-------------------------------------------------------------------------*/
845
846/**
847 * usb_calc_bus_time - approximate periodic transaction time in nanoseconds
848 * @speed: from dev->speed; USB_SPEED_{LOW,FULL,HIGH}
849 * @is_input: true iff the transaction sends data to the host
850 * @isoc: true for isochronous transactions, false for interrupt ones
851 * @bytecount: how many bytes in the transaction.
852 *
853 * Returns approximate bus time in nanoseconds for a periodic transaction.
854 * See USB 2.0 spec section 5.11.3; only periodic transfers need to be
855 * scheduled in software, this function is only used for such scheduling.
856 */
857long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount)
858{
859 unsigned long tmp;
860
861 switch (speed) {
862 case USB_SPEED_LOW: /* INTR only */
863 if (is_input) {
864 tmp = (67667L * (31L + 10L * BitTime (bytecount))) / 1000L;
865 return (64060L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
866 } else {
867 tmp = (66700L * (31L + 10L * BitTime (bytecount))) / 1000L;
868 return (64107L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
869 }
870 case USB_SPEED_FULL: /* ISOC or INTR */
871 if (isoc) {
872 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
873 return (((is_input) ? 7268L : 6265L) + BW_HOST_DELAY + tmp);
874 } else {
875 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
876 return (9107L + BW_HOST_DELAY + tmp);
877 }
878 case USB_SPEED_HIGH: /* ISOC or INTR */
879 // FIXME adjust for input vs output
880 if (isoc)
498f78e6 881 tmp = HS_NSECS_ISO (bytecount);
1da177e4 882 else
498f78e6 883 tmp = HS_NSECS (bytecount);
1da177e4
LT		 884 return tmp;
885 default:
886 pr_debug ("%s: bogus device speed!\n", usbcore_name);
887 return -1;
888 }
889}
890EXPORT_SYMBOL (usb_calc_bus_time);
891
892/*
893 * usb_check_bandwidth():
894 *
895 * old_alloc is from host_controller->bandwidth_allocated in microseconds;
896 * bustime is from calc_bus_time(), but converted to microseconds.
897 *
898 * returns <bustime in us> if successful,
899 * or -ENOSPC if bandwidth request fails.
900 *
901 * FIXME:
902 * This initial implementation does not use Endpoint.bInterval
903 * in managing bandwidth allocation.
904 * It probably needs to be expanded to use Endpoint.bInterval.
905 * This can be done as a later enhancement (correction).
906 *
907 * This will also probably require some kind of
908 * frame allocation tracking...meaning, for example,
909 * that if multiple drivers request interrupts every 10 USB frames,
910 * they don't all have to be allocated at
911 * frame numbers N, N+10, N+20, etc. Some of them could be at
912 * N+11, N+21, N+31, etc., and others at
913 * N+12, N+22, N+32, etc.
914 *
915 * Similarly for isochronous transfers...
916 *
917 * Individual HCDs can schedule more directly ... this logic
918 * is not correct for high speed transfers.
919 */
920int usb_check_bandwidth (struct usb_device *dev, struct urb *urb)
921{
922 unsigned int pipe = urb->pipe;
923 long bustime;
924 int is_in = usb_pipein (pipe);
925 int is_iso = usb_pipeisoc (pipe);
926 int old_alloc = dev->bus->bandwidth_allocated;
927 int new_alloc;
928
929
930 bustime = NS_TO_US (usb_calc_bus_time (dev->speed, is_in, is_iso,
931 usb_maxpacket (dev, pipe, !is_in)));
932 if (is_iso)
933 bustime /= urb->number_of_packets;
934
935 new_alloc = old_alloc + (int) bustime;
936 if (new_alloc > FRAME_TIME_MAX_USECS_ALLOC) {
937#ifdef DEBUG
938 char *mode =
939#ifdef CONFIG_USB_BANDWIDTH
940 "";
941#else
942 "would have ";
943#endif
944 dev_dbg (&dev->dev, "usb_check_bandwidth %sFAILED: %d + %ld = %d usec\n",
945 mode, old_alloc, bustime, new_alloc);
946#endif
947#ifdef CONFIG_USB_BANDWIDTH
948 bustime = -ENOSPC; /* report error */
949#endif
950 }
951
952 return bustime;
953}
954EXPORT_SYMBOL (usb_check_bandwidth);
955
956
957/**
958 * usb_claim_bandwidth - records bandwidth for a periodic transfer
959 * @dev: source/target of request
960 * @urb: request (urb->dev == dev)
961 * @bustime: bandwidth consumed, in (average) microseconds per frame
962 * @isoc: true iff the request is isochronous
963 *
964 * Bus bandwidth reservations are recorded purely for diagnostic purposes.
965 * HCDs are expected not to overcommit periodic bandwidth, and to record such
966 * reservations whenever endpoints are added to the periodic schedule.
967 *
968 * FIXME averaging per-frame is suboptimal. Better to sum over the HCD's
969 * entire periodic schedule ... 32 frames for OHCI, 1024 for UHCI, settable
970 * for EHCI (256/512/1024 frames, default 1024) and have the bus expose how
971 * large its periodic schedule is.
972 */
973void usb_claim_bandwidth (struct usb_device *dev, struct urb *urb, int bustime, int isoc)
974{
975 dev->bus->bandwidth_allocated += bustime;
976 if (isoc)
977 dev->bus->bandwidth_isoc_reqs++;
978 else
979 dev->bus->bandwidth_int_reqs++;
980 urb->bandwidth = bustime;
981
982#ifdef USB_BANDWIDTH_MESSAGES
983 dev_dbg (&dev->dev, "bandwidth alloc increased by %d (%s) to %d for %d requesters\n",
984 bustime,
985 isoc ? "ISOC" : "INTR",
986 dev->bus->bandwidth_allocated,
987 dev->bus->bandwidth_int_reqs + dev->bus->bandwidth_isoc_reqs);
988#endif
989}
990EXPORT_SYMBOL (usb_claim_bandwidth);
991
992
993/**
994 * usb_release_bandwidth - reverses effect of usb_claim_bandwidth()
995 * @dev: source/target of request
996 * @urb: request (urb->dev == dev)
997 * @isoc: true iff the request is isochronous
998 *
999 * This records that previously allocated bandwidth has been released.
1000 * Bandwidth is released when endpoints are removed from the host controller's
1001 * periodic schedule.
1002 */
1003void usb_release_bandwidth (struct usb_device *dev, struct urb *urb, int isoc)
1004{
1005 dev->bus->bandwidth_allocated -= urb->bandwidth;
1006 if (isoc)
1007 dev->bus->bandwidth_isoc_reqs--;
1008 else
1009 dev->bus->bandwidth_int_reqs--;
1010
1011#ifdef USB_BANDWIDTH_MESSAGES
1012 dev_dbg (&dev->dev, "bandwidth alloc reduced by %d (%s) to %d for %d requesters\n",
1013 urb->bandwidth,
1014 isoc ? "ISOC" : "INTR",
1015 dev->bus->bandwidth_allocated,
1016 dev->bus->bandwidth_int_reqs + dev->bus->bandwidth_isoc_reqs);
1017#endif
1018 urb->bandwidth = 0;
1019}
1020EXPORT_SYMBOL (usb_release_bandwidth);
1021
1022
1023/*-------------------------------------------------------------------------*/
1024
1025/*
1026 * Generic HC operations.
1027 */
1028
1029/*-------------------------------------------------------------------------*/
1030
1031static void urb_unlink (struct urb *urb)
1032{
1033 unsigned long flags;
1034
1035 /* Release any periodic transfer bandwidth */
1036 if (urb->bandwidth)
1037 usb_release_bandwidth (urb->dev, urb,
1038 usb_pipeisoc (urb->pipe));
1039
1040 /* clear all state linking urb to this dev (and hcd) */
1041
1042 spin_lock_irqsave (&hcd_data_lock, flags);
1043 list_del_init (&urb->urb_list);
1044 spin_unlock_irqrestore (&hcd_data_lock, flags);
1da177e4
LT		 1045}
1046
1047
1048/* may be called in any context with a valid urb->dev usecount
1049 * caller surrenders "ownership" of urb
1050 * expects usb_submit_urb() to have sanity checked and conditioned all
1051 * inputs in the urb
1052 */
a6d2bb9f 1053int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
1da177e4
LT		 1054{
1055 int status;
17200583 1056 struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus);
1da177e4
LT		 1057 struct usb_host_endpoint *ep;
1058 unsigned long flags;
1059
1060 if (!hcd)
1061 return -ENODEV;
1062
1063 usbmon_urb_submit(&hcd->self, urb);
1064
1065 /*
1066 * Atomically queue the urb, first to our records, then to the HCD.
1067 * Access to urb->status is controlled by urb->lock ... changes on
1068 * i/o completion (normal or fault) or unlinking.
1069 */
1070
1071 // FIXME: verify that quiescing hc works right (RH cleans up)
1072
1073 spin_lock_irqsave (&hcd_data_lock, flags);
1074 ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out)
1075 [usb_pipeendpoint(urb->pipe)];
1076 if (unlikely (!ep))
1077 status = -ENOENT;
1078 else if (unlikely (urb->reject))
1079 status = -EPERM;
1080 else switch (hcd->state) {
1081 case HC_STATE_RUNNING:
1082 case HC_STATE_RESUMING:
979d5199 1083doit:
1da177e4
LT		 1084 list_add_tail (&urb->urb_list, &ep->urb_list);
1085 status = 0;
1086 break;
979d5199
DB		 1087 case HC_STATE_SUSPENDED:
1088 /* HC upstream links (register access, wakeup signaling) can work
1089 * even when the downstream links (and DMA etc) are quiesced; let
1090 * usbcore talk to the root hub.
1091 */
1092 if (hcd->self.controller->power.power_state.event == PM_EVENT_ON
1093 && urb->dev->parent == NULL)
1094 goto doit;
1095 /* FALL THROUGH */
1da177e4
LT		 1096 default:
1097 status = -ESHUTDOWN;
1098 break;
1099 }
1100 spin_unlock_irqrestore (&hcd_data_lock, flags);
1101 if (status) {
1102 INIT_LIST_HEAD (&urb->urb_list);
1103 usbmon_urb_submit_error(&hcd->self, urb, status);
1104 return status;
1105 }
1106
1107 /* increment urb's reference count as part of giving it to the HCD
1108 * (which now controls it). HCD guarantees that it either returns
1109 * an error or calls giveback(), but not both.
1110 */
1111 urb = usb_get_urb (urb);
1112 atomic_inc (&urb->use_count);
1113
1114 if (urb->dev == hcd->self.root_hub) {
1115 /* NOTE: requirement on hub callers (usbfs and the hub
1116 * driver, for now) that URBs' urb->transfer_buffer be
1117 * valid and usb_buffer_{sync,unmap}() not be needed, since
1118 * they could clobber root hub response data.
1119 */
1120 status = rh_urb_enqueue (hcd, urb);
1121 goto done;
1122 }
1123
1124 /* lower level hcd code should use *_dma exclusively,
1125 * unless it uses pio or talks to another transport.
1126 */
dd990f16 1127 if (hcd->self.uses_dma) {
1da177e4
LT		 1128 if (usb_pipecontrol (urb->pipe)
1129 && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
1130 urb->setup_dma = dma_map_single (
1131 hcd->self.controller,
1132 urb->setup_packet,
1133 sizeof (struct usb_ctrlrequest),
1134 DMA_TO_DEVICE);
1135 if (urb->transfer_buffer_length != 0
1136 && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP))
1137 urb->transfer_dma = dma_map_single (
1138 hcd->self.controller,
1139 urb->transfer_buffer,
1140 urb->transfer_buffer_length,
1141 usb_pipein (urb->pipe)
1142 ? DMA_FROM_DEVICE
1143 : DMA_TO_DEVICE);
1144 }
1145
1146 status = hcd->driver->urb_enqueue (hcd, ep, urb, mem_flags);
1147done:
1148 if (unlikely (status)) {
1149 urb_unlink (urb);
1150 atomic_dec (&urb->use_count);
1151 if (urb->reject)
1152 wake_up (&usb_kill_urb_queue);
1153 usb_put_urb (urb);
1154 usbmon_urb_submit_error(&hcd->self, urb, status);
1155 }
1156 return status;
1157}
1158
1159/*-------------------------------------------------------------------------*/
1160
1161/* called in any context */
a6d2bb9f 1162int usb_hcd_get_frame_number (struct usb_device *udev)
1da177e4 1163{
17200583
AS		 1164 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
1165
1da177e4
LT		 1166 if (!HC_IS_RUNNING (hcd->state))
1167 return -ESHUTDOWN;
1168 return hcd->driver->get_frame_number (hcd);
1169}
1170
1171/*-------------------------------------------------------------------------*/
1172
1173/* this makes the hcd giveback() the urb more quickly, by kicking it
1174 * off hardware queues (which may take a while) and returning it as
1175 * soon as practical. we've already set up the urb's return status,
1176 * but we can't know if the callback completed already.
1177 */
1178static int
1179unlink1 (struct usb_hcd *hcd, struct urb *urb)
1180{
1181 int value;
1182
1183 if (urb->dev == hcd->self.root_hub)
1184 value = usb_rh_urb_dequeue (hcd, urb);
1185 else {
1186
1187 /* The only reason an HCD might fail this call is if
1188 * it has not yet fully queued the urb to begin with.
1189 * Such failures should be harmless. */
1190 value = hcd->driver->urb_dequeue (hcd, urb);
1191 }
1192
1193 if (value != 0)
1194 dev_dbg (hcd->self.controller, "dequeue %p --> %d\n",
1195 urb, value);
1196 return value;
1197}
1198
1199/*
1200 * called in any context
1201 *
1202 * caller guarantees urb won't be recycled till both unlink()
1203 * and the urb's completion function return
1204 */
a6d2bb9f 1205int usb_hcd_unlink_urb (struct urb *urb, int status)
1da177e4
LT		 1206{
1207 struct usb_host_endpoint *ep;
1208 struct usb_hcd *hcd = NULL;
1209 struct device *sys = NULL;
1210 unsigned long flags;
1211 struct list_head *tmp;
1212 int retval;
1213
1214 if (!urb)
1215 return -EINVAL;
1216 if (!urb->dev || !urb->dev->bus)
1217 return -ENODEV;
1218 ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out)
1219 [usb_pipeendpoint(urb->pipe)];
1220 if (!ep)
1221 return -ENODEV;
1222
1223 /*
1224 * we contend for urb->status with the hcd core,
1225 * which changes it while returning the urb.
1226 *
1227 * Caller guaranteed that the urb pointer hasn't been freed, and
1228 * that it was submitted. But as a rule it can't know whether or
1229 * not it's already been unlinked ... so we respect the reversed
1230 * lock sequence needed for the usb_hcd_giveback_urb() code paths
1231 * (urb lock, then hcd_data_lock) in case some other CPU is now
1232 * unlinking it.
1233 */
1234 spin_lock_irqsave (&urb->lock, flags);
1235 spin_lock (&hcd_data_lock);
1236
1237 sys = &urb->dev->dev;
17200583 1238 hcd = bus_to_hcd(urb->dev->bus);
1da177e4
LT		 1239 if (hcd == NULL) {
1240 retval = -ENODEV;
1241 goto done;
1242 }
1243
1da177e4
LT		 1244 /* insist the urb is still queued */
1245 list_for_each(tmp, &ep->urb_list) {
1246 if (tmp == &urb->urb_list)
1247 break;
1248 }
1249 if (tmp != &urb->urb_list) {
1250 retval = -EIDRM;
1251 goto done;
1252 }
1253
1254 /* Any status except -EINPROGRESS means something already started to
1255 * unlink this URB from the hardware. So there's no more work to do.
1256 */
1257 if (urb->status != -EINPROGRESS) {
1258 retval = -EBUSY;
1259 goto done;
1260 }
1261
1262 /* IRQ setup can easily be broken so that USB controllers
1263 * never get completion IRQs ... maybe even the ones we need to
1264 * finish unlinking the initial failed usb_set_address()
1265 * or device descriptor fetch.
1266 */
8de98402
BH		 1267 if (!test_bit(HCD_FLAG_SAW_IRQ, &hcd->flags)
1268 && hcd->self.root_hub != urb->dev) {
1da177e4
LT		 1269 dev_warn (hcd->self.controller, "Unlink after no-IRQ? "
1270 "Controller is probably using the wrong IRQ."
1271 "\n");
8de98402 1272 set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
1da177e4
LT		 1273 }
1274
1275 urb->status = status;
1276
1277 spin_unlock (&hcd_data_lock);
1278 spin_unlock_irqrestore (&urb->lock, flags);
1279
1280 retval = unlink1 (hcd, urb);
1281 if (retval == 0)
1282 retval = -EINPROGRESS;
1283 return retval;
1284
1285done:
1286 spin_unlock (&hcd_data_lock);
1287 spin_unlock_irqrestore (&urb->lock, flags);
1288 if (retval != -EIDRM && sys && sys->driver)
1289 dev_dbg (sys, "hcd_unlink_urb %p fail %d\n", urb, retval);
1290 return retval;
1291}
1292
1293/*-------------------------------------------------------------------------*/
1294
1295/* disables the endpoint: cancels any pending urbs, then synchronizes with
455b25fb
AS		 1296 * the hcd to make sure all endpoint state is gone from hardware, and then
1297 * waits until the endpoint's queue is completely drained. use for
1da177e4
LT		 1298 * set_configuration, set_interface, driver removal, physical disconnect.
1299 *
1300 * example: a qh stored in ep->hcpriv, holding state related to endpoint
1301 * type, maxpacket size, toggle, halt status, and scheduling.
1302 */
a6d2bb9f
AS		 1303void usb_hcd_endpoint_disable (struct usb_device *udev,
1304 struct usb_host_endpoint *ep)
1da177e4
LT		 1305{
1306 struct usb_hcd *hcd;
1307 struct urb *urb;
1308
17200583 1309 hcd = bus_to_hcd(udev->bus);
1da177e4 1310
d5926ae7
AS		 1311 WARN_ON (!HC_IS_RUNNING (hcd->state) && hcd->state != HC_STATE_HALT &&
1312 udev->state != USB_STATE_NOTATTACHED);
1da177e4
LT		 1313
1314 local_irq_disable ();
1315
1da177e4
LT		 1316 /* ep is already gone from udev->ep_{in,out}[]; no more submits */
1317rescan:
1318 spin_lock (&hcd_data_lock);
1319 list_for_each_entry (urb, &ep->urb_list, urb_list) {
1320 int tmp;
1321
455b25fb 1322 /* the urb may already have been unlinked */
1da177e4
LT		 1323 if (urb->status != -EINPROGRESS)
1324 continue;
1325 usb_get_urb (urb);
1326 spin_unlock (&hcd_data_lock);
1327
1328 spin_lock (&urb->lock);
1329 tmp = urb->status;
1330 if (tmp == -EINPROGRESS)
1331 urb->status = -ESHUTDOWN;
1332 spin_unlock (&urb->lock);
1333
1334 /* kick hcd unless it's already returning this */
1335 if (tmp == -EINPROGRESS) {
1336 tmp = urb->pipe;
1337 unlink1 (hcd, urb);
1338 dev_dbg (hcd->self.controller,
1339 "shutdown urb %p pipe %08x ep%d%s%s\n",
1340 urb, tmp, usb_pipeendpoint (tmp),
1341 (tmp & USB_DIR_IN) ? "in" : "out",
1342 ({ char *s; \
1343 switch (usb_pipetype (tmp)) { \
1344 case PIPE_CONTROL: s = ""; break; \
1345 case PIPE_BULK: s = "-bulk"; break; \
1346 case PIPE_INTERRUPT: s = "-intr"; break; \
1347 default: s = "-iso"; break; \
1348 }; s;}));
1349 }
1350 usb_put_urb (urb);
1351
1352 /* list contents may have changed */
1353 goto rescan;
1354 }
1355 spin_unlock (&hcd_data_lock);
1356 local_irq_enable ();
1357
1358 /* synchronize with the hardware, so old configuration state
1359 * clears out immediately (and will be freed).
1360 */
1361 might_sleep ();
1362 if (hcd->driver->endpoint_disable)
1363 hcd->driver->endpoint_disable (hcd, ep);
455b25fb
AS		 1364
1365 /* Wait until the endpoint queue is completely empty. Most HCDs
1366 * will have done this already in their endpoint_disable method,
1367 * but some might not. And there could be root-hub control URBs
1368 * still pending since they aren't affected by the HCDs'
1369 * endpoint_disable methods.
1370 */
1371 while (!list_empty (&ep->urb_list)) {
1372 spin_lock_irq (&hcd_data_lock);
1373
1374 /* The list may have changed while we acquired the spinlock */
1375 urb = NULL;
1376 if (!list_empty (&ep->urb_list)) {
1377 urb = list_entry (ep->urb_list.prev, struct urb,
1378 urb_list);
1379 usb_get_urb (urb);
1380 }
1381 spin_unlock_irq (&hcd_data_lock);
1382
1383 if (urb) {
1384 usb_kill_urb (urb);
1385 usb_put_urb (urb);
1386 }
1387 }
1da177e4
LT		 1388}
1389
1390/*-------------------------------------------------------------------------*/
1391
9293677a 1392#ifdef CONFIG_PM
1da177e4 1393
0c0382e3 1394int hcd_bus_suspend (struct usb_bus *bus)
1da177e4
LT		 1395{
1396 struct usb_hcd *hcd;
9293677a 1397 int status;
1da177e4
LT		 1398
1399 hcd = container_of (bus, struct usb_hcd, self);
0c0382e3 1400 if (!hcd->driver->bus_suspend)
9293677a
DB		 1401 return -ENOENT;
1402 hcd->state = HC_STATE_QUIESCING;
0c0382e3 1403 status = hcd->driver->bus_suspend (hcd);
9293677a
DB		 1404 if (status == 0)
1405 hcd->state = HC_STATE_SUSPENDED;
1406 else
1407 dev_dbg(&bus->root_hub->dev, "%s fail, err %d\n",
1408 "suspend", status);
1409 return status;
1da177e4
LT		 1410}
1411
0c0382e3 1412int hcd_bus_resume (struct usb_bus *bus)
1da177e4
LT		 1413{
1414 struct usb_hcd *hcd;
9293677a 1415 int status;
1da177e4
LT		 1416
1417 hcd = container_of (bus, struct usb_hcd, self);
0c0382e3 1418 if (!hcd->driver->bus_resume)
9293677a 1419 return -ENOENT;
979d5199
DB		 1420 if (hcd->state == HC_STATE_RUNNING)
1421 return 0;
9293677a 1422 hcd->state = HC_STATE_RESUMING;
0c0382e3 1423 status = hcd->driver->bus_resume (hcd);
9293677a
DB		 1424 if (status == 0)
1425 hcd->state = HC_STATE_RUNNING;
1426 else {
1427 dev_dbg(&bus->root_hub->dev, "%s fail, err %d\n",
1428 "resume", status);
1429 usb_hc_died(hcd);
1430 }
1431 return status;
1da177e4
LT		 1432}
1433
979d5199
DB		 1434/*
1435 * usb_hcd_suspend_root_hub - HCD autosuspends downstream ports
1436 * @hcd: host controller for this root hub
1437 *
1438 * This call arranges that usb_hcd_resume_root_hub() is safe to call later;
1439 * that the HCD's root hub polling is deactivated; and that the root's hub
1440 * driver is suspended. HCDs may call this to autosuspend when their root
1441 * hub's downstream ports are all inactive: unpowered, disconnected,
1442 * disabled, or suspended.
1443 *
1444 * The HCD will autoresume on device connect change detection (using SRP
1445 * or a D+/D- pullup). The HCD also autoresumes on remote wakeup signaling
1446 * from any ports that are suspended (if that is enabled). In most cases,
1447 * overcurrent signaling (on powered ports) will also start autoresume.
1448 *
1449 * Always called with IRQs blocked.
1450 */
1451void usb_hcd_suspend_root_hub (struct usb_hcd *hcd)
1452{
1453 struct urb *urb;
1454
1455 spin_lock (&hcd_root_hub_lock);
1456 usb_suspend_root_hub (hcd->self.root_hub);
1457
1458 /* force status urb to complete/unlink while suspended */
1459 if (hcd->status_urb) {
1460 urb = hcd->status_urb;
1461 urb->status = -ECONNRESET;
1462 urb->hcpriv = NULL;
1463 urb->actual_length = 0;
1464
1465 del_timer (&hcd->rh_timer);
1466 hcd->poll_pending = 0;
1467 hcd->status_urb = NULL;
1468 } else
1469 urb = NULL;
1470 spin_unlock (&hcd_root_hub_lock);
1471 hcd->state = HC_STATE_SUSPENDED;
1472
1473 if (urb)
1474 usb_hcd_giveback_urb (hcd, urb, NULL);
1475}
1476EXPORT_SYMBOL_GPL(usb_hcd_suspend_root_hub);
1477
1da177e4
LT		 1478/**
1479 * usb_hcd_resume_root_hub - called by HCD to resume its root hub
1480 * @hcd: host controller for this root hub
1481 *
1482 * The USB host controller calls this function when its root hub is
1483 * suspended (with the remote wakeup feature enabled) and a remote
1484 * wakeup request is received. It queues a request for khubd to
979d5199 1485 * resume the root hub (that is, manage its downstream ports again).
1da177e4
LT		 1486 */
1487void usb_hcd_resume_root_hub (struct usb_hcd *hcd)
1488{
1489 unsigned long flags;
1490
1491 spin_lock_irqsave (&hcd_root_hub_lock, flags);
1492 if (hcd->rh_registered)
1493 usb_resume_root_hub (hcd->self.root_hub);
1494 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
1495}
9293677a 1496EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub);
1da177e4 1497
1da177e4 1498#endif
1da177e4
LT		 1499
1500/*-------------------------------------------------------------------------*/
1501
1502#ifdef CONFIG_USB_OTG
1503
1504/**
1505 * usb_bus_start_enum - start immediate enumeration (for OTG)
1506 * @bus: the bus (must use hcd framework)
1507 * @port_num: 1-based number of port; usually bus->otg_port
1508 * Context: in_interrupt()
1509 *
1510 * Starts enumeration, with an immediate reset followed later by
1511 * khubd identifying and possibly configuring the device.
1512 * This is needed by OTG controller drivers, where it helps meet
1513 * HNP protocol timing requirements for starting a port reset.
1514 */
1515int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num)
1516{
1517 struct usb_hcd *hcd;
1518 int status = -EOPNOTSUPP;
1519
1520 /* NOTE: since HNP can't start by grabbing the bus's address0_sem,
1521 * boards with root hubs hooked up to internal devices (instead of
1522 * just the OTG port) may need more attention to resetting...
1523 */
1524 hcd = container_of (bus, struct usb_hcd, self);
1525 if (port_num && hcd->driver->start_port_reset)
1526 status = hcd->driver->start_port_reset(hcd, port_num);
1527
1528 /* run khubd shortly after (first) root port reset finishes;
1529 * it may issue others, until at least 50 msecs have passed.
1530 */
1531 if (status == 0)
1532 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10));
1533 return status;
1534}
1535EXPORT_SYMBOL (usb_bus_start_enum);
1536
1537#endif
1538
1539/*-------------------------------------------------------------------------*/
1540
1da177e4
LT		 1541/**
1542 * usb_hcd_giveback_urb - return URB from HCD to device driver
1543 * @hcd: host controller returning the URB
1544 * @urb: urb being returned to the USB device driver.
1545 * @regs: pt_regs, passed down to the URB completion handler
1546 * Context: in_interrupt()
1547 *
1548 * This hands the URB from HCD to its USB device driver, using its
1549 * completion function. The HCD has freed all per-urb resources
1550 * (and is done using urb->hcpriv). It also released all HCD locks;
1551 * the device driver won't cause problems if it frees, modifies,
1552 * or resubmits this URB.
1553 */
1554void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb, struct pt_regs *regs)
1555{
1556 int at_root_hub;
1557
1558 at_root_hub = (urb->dev == hcd->self.root_hub);
1559 urb_unlink (urb);
1560
dd990f16
AS		 1561 /* lower level hcd code should use *_dma exclusively if the
1562 * host controller does DMA */
1563 if (hcd->self.uses_dma && !at_root_hub) {
1da177e4
LT		 1564 if (usb_pipecontrol (urb->pipe)
1565 && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
1566 dma_unmap_single (hcd->self.controller, urb->setup_dma,
1567 sizeof (struct usb_ctrlrequest),
1568 DMA_TO_DEVICE);
1569 if (urb->transfer_buffer_length != 0
1570 && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP))
1571 dma_unmap_single (hcd->self.controller,
1572 urb->transfer_dma,
1573 urb->transfer_buffer_length,
1574 usb_pipein (urb->pipe)
1575 ? DMA_FROM_DEVICE
1576 : DMA_TO_DEVICE);
1577 }
1578
1579 usbmon_urb_complete (&hcd->self, urb);
1580 /* pass ownership to the completion handler */
1581 urb->complete (urb, regs);
1582 atomic_dec (&urb->use_count);
1583 if (unlikely (urb->reject))
1584 wake_up (&usb_kill_urb_queue);
1585 usb_put_urb (urb);
1586}
1587EXPORT_SYMBOL (usb_hcd_giveback_urb);
1588
1589/*-------------------------------------------------------------------------*/
1590
1591/**
1592 * usb_hcd_irq - hook IRQs to HCD framework (bus glue)
1593 * @irq: the IRQ being raised
1594 * @__hcd: pointer to the HCD whose IRQ is being signaled
1595 * @r: saved hardware registers
1596 *
1597 * If the controller isn't HALTed, calls the driver's irq handler.
1598 * Checks whether the controller is now dead.
1599 */
1600irqreturn_t usb_hcd_irq (int irq, void *__hcd, struct pt_regs * r)
1601{
1602 struct usb_hcd *hcd = __hcd;
1603 int start = hcd->state;
1604
8de98402
BH		 1605 if (unlikely(start == HC_STATE_HALT ||
1606 !test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
1da177e4
LT		 1607 return IRQ_NONE;
1608 if (hcd->driver->irq (hcd, r) == IRQ_NONE)
1609 return IRQ_NONE;
1610
8de98402
BH		 1611 set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
1612
1613 if (unlikely(hcd->state == HC_STATE_HALT))
1da177e4
LT		 1614 usb_hc_died (hcd);
1615 return IRQ_HANDLED;
1616}
1617
1618/*-------------------------------------------------------------------------*/
1619
1620/**
1621 * usb_hc_died - report abnormal shutdown of a host controller (bus glue)
1622 * @hcd: pointer to the HCD representing the controller
1623 *
1624 * This is called by bus glue to report a USB host controller that died
1625 * while operations may still have been pending. It's called automatically
1626 * by the PCI glue, so only glue for non-PCI busses should need to call it.
1627 */
1628void usb_hc_died (struct usb_hcd *hcd)
1629{
1630 unsigned long flags;
1631
1632 dev_err (hcd->self.controller, "HC died; cleaning up\n");
1633
1634 spin_lock_irqsave (&hcd_root_hub_lock, flags);
1635 if (hcd->rh_registered) {
d5926ae7 1636 hcd->poll_rh = 0;
1da177e4
LT		 1637
1638 /* make khubd clean up old urbs and devices */
1639 usb_set_device_state (hcd->self.root_hub,
1640 USB_STATE_NOTATTACHED);
1641 usb_kick_khubd (hcd->self.root_hub);
1642 }
1643 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
1644}
1645EXPORT_SYMBOL_GPL (usb_hc_died);
1646
1647/*-------------------------------------------------------------------------*/
1648
1da177e4
LT		 1649/**
1650 * usb_create_hcd - create and initialize an HCD structure
1651 * @driver: HC driver that will use this hcd
1652 * @dev: device for this HC, stored in hcd->self.controller
1653 * @bus_name: value to store in hcd->self.bus_name
1654 * Context: !in_interrupt()
1655 *
1656 * Allocate a struct usb_hcd, with extra space at the end for the
1657 * HC driver's private data. Initialize the generic members of the
1658 * hcd structure.
1659 *
1660 * If memory is unavailable, returns NULL.
1661 */
1662struct usb_hcd *usb_create_hcd (const struct hc_driver *driver,
1663 struct device *dev, char *bus_name)
1664{
1665 struct usb_hcd *hcd;
1666
7b842b6e 1667 hcd = kzalloc(sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL);
1da177e4
LT		 1668 if (!hcd) {
1669 dev_dbg (dev, "hcd alloc failed\n");
1670 return NULL;
1671 }
1672 dev_set_drvdata(dev, hcd);
17200583 1673 kref_init(&hcd->kref);
1da177e4
LT		 1674
1675 usb_bus_init(&hcd->self);
1da177e4
LT		 1676 hcd->self.controller = dev;
1677 hcd->self.bus_name = bus_name;
dd990f16 1678 hcd->self.uses_dma = (dev->dma_mask != NULL);
1da177e4
LT		 1679
1680 init_timer(&hcd->rh_timer);
d5926ae7
AS		 1681 hcd->rh_timer.function = rh_timer_func;
1682 hcd->rh_timer.data = (unsigned long) hcd;
1da177e4
LT		 1683
1684 hcd->driver = driver;
1685 hcd->product_desc = (driver->product_desc) ? driver->product_desc :
1686 "USB Host Controller";
1687
1688 return hcd;
1689}
1690EXPORT_SYMBOL (usb_create_hcd);
1691
17200583
AS		 1692static void hcd_release (struct kref *kref)
1693{
1694 struct usb_hcd *hcd = container_of (kref, struct usb_hcd, kref);
1695
1696 kfree(hcd);
1697}
1698
1699struct usb_hcd *usb_get_hcd (struct usb_hcd *hcd)
1700{
1701 if (hcd)
1702 kref_get (&hcd->kref);
1703 return hcd;
1704}
1705EXPORT_SYMBOL (usb_get_hcd);
1706
1da177e4
LT		 1707void usb_put_hcd (struct usb_hcd *hcd)
1708{
17200583
AS		 1709 if (hcd)
1710 kref_put (&hcd->kref, hcd_release);
1da177e4
LT		 1711}
1712EXPORT_SYMBOL (usb_put_hcd);
1713
1714/**
1715 * usb_add_hcd - finish generic HCD structure initialization and register
1716 * @hcd: the usb_hcd structure to initialize
1717 * @irqnum: Interrupt line to allocate
1718 * @irqflags: Interrupt type flags
1719 *
1720 * Finish the remaining parts of generic HCD initialization: allocate the
1721 * buffers of consistent memory, register the bus, request the IRQ line,
1722 * and call the driver's reset() and start() routines.
1723 */
1724int usb_add_hcd(struct usb_hcd *hcd,
1725 unsigned int irqnum, unsigned long irqflags)
1726{
8ec8d20b
AS		 1727 int retval;
1728 struct usb_device *rhdev;
1da177e4
LT		 1729
1730 dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
1731
8de98402
BH		 1732 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1733
b1e8f0a6
DB		 1734 /* HC is in reset state, but accessible. Now do the one-time init,
1735 * bottom up so that hcds can customize the root hubs before khubd
1736 * starts talking to them. (Note, bus id is assigned early too.)
1737 */
1da177e4
LT		 1738 if ((retval = hcd_buffer_create(hcd)) != 0) {
1739 dev_dbg(hcd->self.controller, "pool alloc failed\n");
1740 return retval;
1741 }
1742
1743 if ((retval = usb_register_bus(&hcd->self)) < 0)
8ec8d20b 1744 goto err_register_bus;
1da177e4 1745
b1e8f0a6
DB		 1746 if ((rhdev = usb_alloc_dev(NULL, &hcd->self, 0)) == NULL) {
1747 dev_err(hcd->self.controller, "unable to allocate root hub\n");
1748 retval = -ENOMEM;
1749 goto err_allocate_root_hub;
1750 }
1751 rhdev->speed = (hcd->driver->flags & HCD_USB2) ? USB_SPEED_HIGH :
1752 USB_SPEED_FULL;
1753 hcd->self.root_hub = rhdev;
1754
db4cefaa
DB		 1755 /* wakeup flag init defaults to "everything works" for root hubs,
1756 * but drivers can override it in reset() if needed, along with
1757 * recording the overall controller's system wakeup capability.
1758 */
1759 device_init_wakeup(&rhdev->dev, 1);
1760
b1e8f0a6
DB		 1761 /* "reset" is misnamed; its role is now one-time init. the controller
1762 * should already have been reset (and boot firmware kicked off etc).
1763 */
1764 if (hcd->driver->reset && (retval = hcd->driver->reset(hcd)) < 0) {
1765 dev_err(hcd->self.controller, "can't setup\n");
1766 goto err_hcd_driver_setup;
1767 }
1768
fb669cc0
DB		 1769 /* NOTE: root hub and controller capabilities may not be the same */
1770 if (device_can_wakeup(hcd->self.controller)
1771 && device_can_wakeup(&hcd->self.root_hub->dev))
b1e8f0a6 1772 dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
b1e8f0a6
DB		 1773
1774 /* enable irqs just before we start the controller */
1da177e4 1775 if (hcd->driver->irq) {
1da177e4
LT		 1776 snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d",
1777 hcd->driver->description, hcd->self.busnum);
1778 if ((retval = request_irq(irqnum, &usb_hcd_irq, irqflags,
1779 hcd->irq_descr, hcd)) != 0) {
1780 dev_err(hcd->self.controller,
c6387a48 1781 "request interrupt %d failed\n", irqnum);
8ec8d20b 1782 goto err_request_irq;
1da177e4
LT		 1783 }
1784 hcd->irq = irqnum;
c6387a48 1785 dev_info(hcd->self.controller, "irq %d, %s 0x%08llx\n", irqnum,
1da177e4
LT		 1786 (hcd->driver->flags & HCD_MEMORY) ?
1787 "io mem" : "io base",
1788 (unsigned long long)hcd->rsrc_start);
1789 } else {
1790 hcd->irq = -1;
1791 if (hcd->rsrc_start)
1792 dev_info(hcd->self.controller, "%s 0x%08llx\n",
1793 (hcd->driver->flags & HCD_MEMORY) ?
1794 "io mem" : "io base",
1795 (unsigned long long)hcd->rsrc_start);
1796 }
1797
1798 if ((retval = hcd->driver->start(hcd)) < 0) {
1799 dev_err(hcd->self.controller, "startup error %d\n", retval);
8ec8d20b 1800 goto err_hcd_driver_start;
1da177e4
LT		 1801 }
1802
b1e8f0a6 1803 /* starting here, usbcore will pay attention to this root hub */
55c52718 1804 rhdev->bus_mA = min(500u, hcd->power_budget);
b1e8f0a6 1805 if ((retval = register_root_hub(hcd)) != 0)
8ec8d20b
AS		 1806 goto err_register_root_hub;
1807
d5926ae7
AS		 1808 if (hcd->uses_new_polling && hcd->poll_rh)
1809 usb_hcd_poll_rh_status(hcd);
1da177e4
LT		 1810 return retval;
1811
b1e8f0a6 1812err_register_root_hub:
8ec8d20b 1813 hcd->driver->stop(hcd);
b1e8f0a6 1814err_hcd_driver_start:
1da177e4
LT		 1815 if (hcd->irq >= 0)
1816 free_irq(irqnum, hcd);
b1e8f0a6
DB		 1817err_request_irq:
1818err_hcd_driver_setup:
1819 hcd->self.root_hub = NULL;
1820 usb_put_dev(rhdev);
1821err_allocate_root_hub:
1da177e4 1822 usb_deregister_bus(&hcd->self);
b1e8f0a6 1823err_register_bus:
1da177e4
LT		 1824 hcd_buffer_destroy(hcd);
1825 return retval;
1826}
1827EXPORT_SYMBOL (usb_add_hcd);
1828
1829/**
1830 * usb_remove_hcd - shutdown processing for generic HCDs
1831 * @hcd: the usb_hcd structure to remove
1832 * Context: !in_interrupt()
1833 *
1834 * Disconnects the root hub, then reverses the effects of usb_add_hcd(),
1835 * invoking the HCD's stop() method.
1836 */
1837void usb_remove_hcd(struct usb_hcd *hcd)
1838{
1839 dev_info(hcd->self.controller, "remove, state %x\n", hcd->state);
1840
1841 if (HC_IS_RUNNING (hcd->state))
1842 hcd->state = HC_STATE_QUIESCING;
1843
1844 dev_dbg(hcd->self.controller, "roothub graceful disconnect\n");
1845 spin_lock_irq (&hcd_root_hub_lock);
1846 hcd->rh_registered = 0;
1847 spin_unlock_irq (&hcd_root_hub_lock);
9ad3d6cc 1848
4186ecf8 1849 mutex_lock(&usb_bus_list_lock);
1da177e4 1850 usb_disconnect(&hcd->self.root_hub);
4186ecf8 1851 mutex_unlock(&usb_bus_list_lock);
1da177e4 1852
d5926ae7
AS		 1853 hcd->poll_rh = 0;
1854 del_timer_sync(&hcd->rh_timer);
1855
1da177e4
LT		 1856 hcd->driver->stop(hcd);
1857 hcd->state = HC_STATE_HALT;
1858
1859 if (hcd->irq >= 0)
1860 free_irq(hcd->irq, hcd);
1861 usb_deregister_bus(&hcd->self);
1862 hcd_buffer_destroy(hcd);
1863}
1864EXPORT_SYMBOL (usb_remove_hcd);
1865
64a21d02
AG		 1866void
1867usb_hcd_platform_shutdown(struct platform_device* dev)
1868{
1869 struct usb_hcd *hcd = platform_get_drvdata(dev);
1870
1871 if (hcd->driver->shutdown)
1872 hcd->driver->shutdown(hcd);
1873}
1874EXPORT_SYMBOL (usb_hcd_platform_shutdown);
1875
1da177e4
LT		 1876/*-------------------------------------------------------------------------*/
1877
4749f32d 1878#if defined(CONFIG_USB_MON)
1da177e4
LT		 1879
1880struct usb_mon_operations *mon_ops;
1881
1882/*
1883 * The registration is unlocked.
1884 * We do it this way because we do not want to lock in hot paths.
1885 *
1886 * Notice that the code is minimally error-proof. Because usbmon needs
1887 * symbols from usbcore, usbcore gets referenced and cannot be unloaded first.
1888 */
1889
1890int usb_mon_register (struct usb_mon_operations *ops)
1891{
1892
1893 if (mon_ops)
1894 return -EBUSY;
1895
1896 mon_ops = ops;
1897 mb();
1898 return 0;
1899}
1900EXPORT_SYMBOL_GPL (usb_mon_register);
1901
1902void usb_mon_deregister (void)
1903{
1904
1905 if (mon_ops == NULL) {
1906 printk(KERN_ERR "USB: monitor was not registered\n");
1907 return;
1908 }
1909 mon_ops = NULL;
1910 mb();
1911}
1912EXPORT_SYMBOL_GPL (usb_mon_deregister);
1913
1914#endif /* CONFIG_USB_MON */
Linux kernel - Deliverables
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