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1/*
2 * (C) Copyright Linus Torvalds 1999
3 * (C) Copyright Johannes Erdfelt 1999-2001
4 * (C) Copyright Andreas Gal 1999
5 * (C) Copyright Gregory P. Smith 1999
6 * (C) Copyright Deti Fliegl 1999
7 * (C) Copyright Randy Dunlap 2000
8 * (C) Copyright David Brownell 2000-2002
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 * for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
25#include <linux/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 <linux/device.h>
34#include <linux/dma-mapping.h>
35#include <linux/mutex.h>
36#include <asm/irq.h>
37#include <asm/byteorder.h>
38#include <asm/unaligned.h>
39#include <linux/platform_device.h>
40#include <linux/workqueue.h>
41
42#include <linux/usb.h>
43#include <linux/usb/hcd.h>
44
45#include "usb.h"
46
47
48/*-------------------------------------------------------------------------*/
49
50/*
51 * USB Host Controller Driver framework
52 *
53 * Plugs into usbcore (usb_bus) and lets HCDs share code, minimizing
54 * HCD-specific behaviors/bugs.
55 *
56 * This does error checks, tracks devices and urbs, and delegates to a
57 * "hc_driver" only for code (and data) that really needs to know about
58 * hardware differences. That includes root hub registers, i/o queues,
59 * and so on ... but as little else as possible.
60 *
61 * Shared code includes most of the "root hub" code (these are emulated,
62 * though each HC's hardware works differently) and PCI glue, plus request
63 * tracking overhead. The HCD code should only block on spinlocks or on
64 * hardware handshaking; blocking on software events (such as other kernel
65 * threads releasing resources, or completing actions) is all generic.
66 *
67 * Happens the USB 2.0 spec says this would be invisible inside the "USBD",
68 * and includes mostly a "HCDI" (HCD Interface) along with some APIs used
69 * only by the hub driver ... and that neither should be seen or used by
70 * usb client device drivers.
71 *
72 * Contributors of ideas or unattributed patches include: David Brownell,
73 * Roman Weissgaerber, Rory Bolt, Greg Kroah-Hartman, ...
74 *
75 * HISTORY:
76 * 2002-02-21 Pull in most of the usb_bus support from usb.c; some
77 * associated cleanup. "usb_hcd" still != "usb_bus".
78 * 2001-12-12 Initial patch version for Linux 2.5.1 kernel.
79 */
80
81/*-------------------------------------------------------------------------*/
82
83/* Keep track of which host controller drivers are loaded */
84unsigned long usb_hcds_loaded;
85EXPORT_SYMBOL_GPL(usb_hcds_loaded);
86
87/* host controllers we manage */
88LIST_HEAD (usb_bus_list);
89EXPORT_SYMBOL_GPL (usb_bus_list);
90
91/* used when allocating bus numbers */
92#define USB_MAXBUS 64
93struct usb_busmap {
94 unsigned long busmap [USB_MAXBUS / (8*sizeof (unsigned long))];
95};
96static struct usb_busmap busmap;
97
98/* used when updating list of hcds */
99DEFINE_MUTEX(usb_bus_list_lock); /* exported only for usbfs */
100EXPORT_SYMBOL_GPL (usb_bus_list_lock);
101
102/* used for controlling access to virtual root hubs */
103static DEFINE_SPINLOCK(hcd_root_hub_lock);
104
105/* used when updating an endpoint's URB list */
106static DEFINE_SPINLOCK(hcd_urb_list_lock);
107
108/* used to protect against unlinking URBs after the device is gone */
109static DEFINE_SPINLOCK(hcd_urb_unlink_lock);
110
111/* wait queue for synchronous unlinks */
112DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue);
113
114static inline int is_root_hub(struct usb_device *udev)
115{
116 return (udev->parent == NULL);
117}
118
119/*-------------------------------------------------------------------------*/
120
121/*
122 * Sharable chunks of root hub code.
123 */
124
125/*-------------------------------------------------------------------------*/
126
127#define KERNEL_REL ((LINUX_VERSION_CODE >> 16) & 0x0ff)
128#define KERNEL_VER ((LINUX_VERSION_CODE >> 8) & 0x0ff)
129
130/* usb 3.0 root hub device descriptor */
131static const u8 usb3_rh_dev_descriptor[18] = {
132 0x12, /* __u8 bLength; */
133 0x01, /* __u8 bDescriptorType; Device */
134 0x00, 0x03, /* __le16 bcdUSB; v3.0 */
135
136 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
137 0x00, /* __u8 bDeviceSubClass; */
138 0x03, /* __u8 bDeviceProtocol; USB 3.0 hub */
139 0x09, /* __u8 bMaxPacketSize0; 2^9 = 512 Bytes */
140
141 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation */
142 0x03, 0x00, /* __le16 idProduct; device 0x0003 */
143 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
144
145 0x03, /* __u8 iManufacturer; */
146 0x02, /* __u8 iProduct; */
147 0x01, /* __u8 iSerialNumber; */
148 0x01 /* __u8 bNumConfigurations; */
149};
150
151/* usb 2.0 root hub device descriptor */
152static const u8 usb2_rh_dev_descriptor [18] = {
153 0x12, /* __u8 bLength; */
154 0x01, /* __u8 bDescriptorType; Device */
155 0x00, 0x02, /* __le16 bcdUSB; v2.0 */
156
157 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
158 0x00, /* __u8 bDeviceSubClass; */
159 0x00, /* __u8 bDeviceProtocol; [ usb 2.0 no TT ] */
160 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
161
162 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation */
163 0x02, 0x00, /* __le16 idProduct; device 0x0002 */
164 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
165
166 0x03, /* __u8 iManufacturer; */
167 0x02, /* __u8 iProduct; */
168 0x01, /* __u8 iSerialNumber; */
169 0x01 /* __u8 bNumConfigurations; */
170};
171
172/* no usb 2.0 root hub "device qualifier" descriptor: one speed only */
173
174/* usb 1.1 root hub device descriptor */
175static const u8 usb11_rh_dev_descriptor [18] = {
176 0x12, /* __u8 bLength; */
177 0x01, /* __u8 bDescriptorType; Device */
178 0x10, 0x01, /* __le16 bcdUSB; v1.1 */
179
180 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
181 0x00, /* __u8 bDeviceSubClass; */
182 0x00, /* __u8 bDeviceProtocol; [ low/full speeds only ] */
183 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
184
185 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation */
186 0x01, 0x00, /* __le16 idProduct; device 0x0001 */
187 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
188
189 0x03, /* __u8 iManufacturer; */
190 0x02, /* __u8 iProduct; */
191 0x01, /* __u8 iSerialNumber; */
192 0x01 /* __u8 bNumConfigurations; */
193};
194
195
196/*-------------------------------------------------------------------------*/
197
198/* Configuration descriptors for our root hubs */
199
200static const u8 fs_rh_config_descriptor [] = {
201
202 /* one configuration */
203 0x09, /* __u8 bLength; */
204 0x02, /* __u8 bDescriptorType; Configuration */
205 0x19, 0x00, /* __le16 wTotalLength; */
206 0x01, /* __u8 bNumInterfaces; (1) */
207 0x01, /* __u8 bConfigurationValue; */
208 0x00, /* __u8 iConfiguration; */
209 0xc0, /* __u8 bmAttributes;
210 Bit 7: must be set,
211 6: Self-powered,
212 5: Remote wakeup,
213 4..0: resvd */
214 0x00, /* __u8 MaxPower; */
215
216 /* USB 1.1:
217 * USB 2.0, single TT organization (mandatory):
218 * one interface, protocol 0
219 *
220 * USB 2.0, multiple TT organization (optional):
221 * two interfaces, protocols 1 (like single TT)
222 * and 2 (multiple TT mode) ... config is
223 * sometimes settable
224 * NOT IMPLEMENTED
225 */
226
227 /* one interface */
228 0x09, /* __u8 if_bLength; */
229 0x04, /* __u8 if_bDescriptorType; Interface */
230 0x00, /* __u8 if_bInterfaceNumber; */
231 0x00, /* __u8 if_bAlternateSetting; */
232 0x01, /* __u8 if_bNumEndpoints; */
233 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
234 0x00, /* __u8 if_bInterfaceSubClass; */
235 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
236 0x00, /* __u8 if_iInterface; */
237
238 /* one endpoint (status change endpoint) */
239 0x07, /* __u8 ep_bLength; */
240 0x05, /* __u8 ep_bDescriptorType; Endpoint */
241 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
242 0x03, /* __u8 ep_bmAttributes; Interrupt */
243 0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */
244 0xff /* __u8 ep_bInterval; (255ms -- usb 2.0 spec) */
245};
246
247static const u8 hs_rh_config_descriptor [] = {
248
249 /* one configuration */
250 0x09, /* __u8 bLength; */
251 0x02, /* __u8 bDescriptorType; Configuration */
252 0x19, 0x00, /* __le16 wTotalLength; */
253 0x01, /* __u8 bNumInterfaces; (1) */
254 0x01, /* __u8 bConfigurationValue; */
255 0x00, /* __u8 iConfiguration; */
256 0xc0, /* __u8 bmAttributes;
257 Bit 7: must be set,
258 6: Self-powered,
259 5: Remote wakeup,
260 4..0: resvd */
261 0x00, /* __u8 MaxPower; */
262
263 /* USB 1.1:
264 * USB 2.0, single TT organization (mandatory):
265 * one interface, protocol 0
266 *
267 * USB 2.0, multiple TT organization (optional):
268 * two interfaces, protocols 1 (like single TT)
269 * and 2 (multiple TT mode) ... config is
270 * sometimes settable
271 * NOT IMPLEMENTED
272 */
273
274 /* one interface */
275 0x09, /* __u8 if_bLength; */
276 0x04, /* __u8 if_bDescriptorType; Interface */
277 0x00, /* __u8 if_bInterfaceNumber; */
278 0x00, /* __u8 if_bAlternateSetting; */
279 0x01, /* __u8 if_bNumEndpoints; */
280 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
281 0x00, /* __u8 if_bInterfaceSubClass; */
282 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
283 0x00, /* __u8 if_iInterface; */
284
285 /* one endpoint (status change endpoint) */
286 0x07, /* __u8 ep_bLength; */
287 0x05, /* __u8 ep_bDescriptorType; Endpoint */
288 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
289 0x03, /* __u8 ep_bmAttributes; Interrupt */
290 /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
291 * see hub.c:hub_configure() for details. */
292 (USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
293 0x0c /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
294};
295
296static const u8 ss_rh_config_descriptor[] = {
297 /* one configuration */
298 0x09, /* __u8 bLength; */
299 0x02, /* __u8 bDescriptorType; Configuration */
300 0x1f, 0x00, /* __le16 wTotalLength; */
301 0x01, /* __u8 bNumInterfaces; (1) */
302 0x01, /* __u8 bConfigurationValue; */
303 0x00, /* __u8 iConfiguration; */
304 0xc0, /* __u8 bmAttributes;
305 Bit 7: must be set,
306 6: Self-powered,
307 5: Remote wakeup,
308 4..0: resvd */
309 0x00, /* __u8 MaxPower; */
310
311 /* one interface */
312 0x09, /* __u8 if_bLength; */
313 0x04, /* __u8 if_bDescriptorType; Interface */
314 0x00, /* __u8 if_bInterfaceNumber; */
315 0x00, /* __u8 if_bAlternateSetting; */
316 0x01, /* __u8 if_bNumEndpoints; */
317 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
318 0x00, /* __u8 if_bInterfaceSubClass; */
319 0x00, /* __u8 if_bInterfaceProtocol; */
320 0x00, /* __u8 if_iInterface; */
321
322 /* one endpoint (status change endpoint) */
323 0x07, /* __u8 ep_bLength; */
324 0x05, /* __u8 ep_bDescriptorType; Endpoint */
325 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
326 0x03, /* __u8 ep_bmAttributes; Interrupt */
327 /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
328 * see hub.c:hub_configure() for details. */
329 (USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
330 0x0c, /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
331
332 /* one SuperSpeed endpoint companion descriptor */
333 0x06, /* __u8 ss_bLength */
334 0x30, /* __u8 ss_bDescriptorType; SuperSpeed EP Companion */
335 0x00, /* __u8 ss_bMaxBurst; allows 1 TX between ACKs */
336 0x00, /* __u8 ss_bmAttributes; 1 packet per service interval */
337 0x02, 0x00 /* __le16 ss_wBytesPerInterval; 15 bits for max 15 ports */
338};
339
340/* authorized_default behaviour:
341 * -1 is authorized for all devices except wireless (old behaviour)
342 * 0 is unauthorized for all devices
343 * 1 is authorized for all devices
344 */
345static int authorized_default = -1;
346module_param(authorized_default, int, S_IRUGO|S_IWUSR);
347MODULE_PARM_DESC(authorized_default,
348 "Default USB device authorization: 0 is not authorized, 1 is "
349 "authorized, -1 is authorized except for wireless USB (default, "
350 "old behaviour");
351/*-------------------------------------------------------------------------*/
352
353/**
354 * ascii2desc() - Helper routine for producing UTF-16LE string descriptors
355 * @s: Null-terminated ASCII (actually ISO-8859-1) string
356 * @buf: Buffer for USB string descriptor (header + UTF-16LE)
357 * @len: Length (in bytes; may be odd) of descriptor buffer.
358 *
359 * The return value is the number of bytes filled in: 2 + 2*strlen(s) or
360 * buflen, whichever is less.
361 *
362 * USB String descriptors can contain at most 126 characters; input
363 * strings longer than that are truncated.
364 */
365static unsigned
366ascii2desc(char const *s, u8 *buf, unsigned len)
367{
368 unsigned n, t = 2 + 2*strlen(s);
369
370 if (t > 254)
371 t = 254; /* Longest possible UTF string descriptor */
372 if (len > t)
373 len = t;
374
375 t += USB_DT_STRING << 8; /* Now t is first 16 bits to store */
376
377 n = len;
378 while (n--) {
379 *buf++ = t;
380 if (!n--)
381 break;
382 *buf++ = t >> 8;
383 t = (unsigned char)*s++;
384 }
385 return len;
386}
387
388/**
389 * rh_string() - provides string descriptors for root hub
390 * @id: the string ID number (0: langids, 1: serial #, 2: product, 3: vendor)
391 * @hcd: the host controller for this root hub
392 * @data: buffer for output packet
393 * @len: length of the provided buffer
394 *
395 * Produces either a manufacturer, product or serial number string for the
396 * virtual root hub device.
397 * Returns the number of bytes filled in: the length of the descriptor or
398 * of the provided buffer, whichever is less.
399 */
400static unsigned
401rh_string(int id, struct usb_hcd const *hcd, u8 *data, unsigned len)
402{
403 char buf[100];
404 char const *s;
405 static char const langids[4] = {4, USB_DT_STRING, 0x09, 0x04};
406
407 // language ids
408 switch (id) {
409 case 0:
410 /* Array of LANGID codes (0x0409 is MSFT-speak for "en-us") */
411 /* See http://www.usb.org/developers/docs/USB_LANGIDs.pdf */
412 if (len > 4)
413 len = 4;
414 memcpy(data, langids, len);
415 return len;
416 case 1:
417 /* Serial number */
418 s = hcd->self.bus_name;
419 break;
420 case 2:
421 /* Product name */
422 s = hcd->product_desc;
423 break;
424 case 3:
425 /* Manufacturer */
426 snprintf (buf, sizeof buf, "%s %s %s", init_utsname()->sysname,
427 init_utsname()->release, hcd->driver->description);
428 s = buf;
429 break;
430 default:
431 /* Can't happen; caller guarantees it */
432 return 0;
433 }
434
435 return ascii2desc(s, data, len);
436}
437
438
439/* Root hub control transfers execute synchronously */
440static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
441{
442 struct usb_ctrlrequest *cmd;
443 u16 typeReq, wValue, wIndex, wLength;
444 u8 *ubuf = urb->transfer_buffer;
445 u8 tbuf [sizeof (struct usb_hub_descriptor)]
446 __attribute__((aligned(4)));
447 const u8 *bufp = tbuf;
448 unsigned len = 0;
449 int status;
450 u8 patch_wakeup = 0;
451 u8 patch_protocol = 0;
452
453 might_sleep();
454
455 spin_lock_irq(&hcd_root_hub_lock);
456 status = usb_hcd_link_urb_to_ep(hcd, urb);
457 spin_unlock_irq(&hcd_root_hub_lock);
458 if (status)
459 return status;
460 urb->hcpriv = hcd; /* Indicate it's queued */
461
462 cmd = (struct usb_ctrlrequest *) urb->setup_packet;
463 typeReq = (cmd->bRequestType << 8) | cmd->bRequest;
464 wValue = le16_to_cpu (cmd->wValue);
465 wIndex = le16_to_cpu (cmd->wIndex);
466 wLength = le16_to_cpu (cmd->wLength);
467
468 if (wLength > urb->transfer_buffer_length)
469 goto error;
470
471 urb->actual_length = 0;
472 switch (typeReq) {
473
474 /* DEVICE REQUESTS */
475
476 /* The root hub's remote wakeup enable bit is implemented using
477 * driver model wakeup flags. If this system supports wakeup
478 * through USB, userspace may change the default "allow wakeup"
479 * policy through sysfs or these calls.
480 *
481 * Most root hubs support wakeup from downstream devices, for
482 * runtime power management (disabling USB clocks and reducing
483 * VBUS power usage). However, not all of them do so; silicon,
484 * board, and BIOS bugs here are not uncommon, so these can't
485 * be treated quite like external hubs.
486 *
487 * Likewise, not all root hubs will pass wakeup events upstream,
488 * to wake up the whole system. So don't assume root hub and
489 * controller capabilities are identical.
490 */
491
492 case DeviceRequest | USB_REQ_GET_STATUS:
493 tbuf [0] = (device_may_wakeup(&hcd->self.root_hub->dev)
494 << USB_DEVICE_REMOTE_WAKEUP)
495 | (1 << USB_DEVICE_SELF_POWERED);
496 tbuf [1] = 0;
497 len = 2;
498 break;
499 case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
500 if (wValue == USB_DEVICE_REMOTE_WAKEUP)
501 device_set_wakeup_enable(&hcd->self.root_hub->dev, 0);
502 else
503 goto error;
504 break;
505 case DeviceOutRequest | USB_REQ_SET_FEATURE:
506 if (device_can_wakeup(&hcd->self.root_hub->dev)
507 && wValue == USB_DEVICE_REMOTE_WAKEUP)
508 device_set_wakeup_enable(&hcd->self.root_hub->dev, 1);
509 else
510 goto error;
511 break;
512 case DeviceRequest | USB_REQ_GET_CONFIGURATION:
513 tbuf [0] = 1;
514 len = 1;
515 /* FALLTHROUGH */
516 case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
517 break;
518 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
519 switch (wValue & 0xff00) {
520 case USB_DT_DEVICE << 8:
521 switch (hcd->speed) {
522 case HCD_USB3:
523 bufp = usb3_rh_dev_descriptor;
524 break;
525 case HCD_USB2:
526 bufp = usb2_rh_dev_descriptor;
527 break;
528 case HCD_USB11:
529 bufp = usb11_rh_dev_descriptor;
530 break;
531 default:
532 goto error;
533 }
534 len = 18;
535 if (hcd->has_tt)
536 patch_protocol = 1;
537 break;
538 case USB_DT_CONFIG << 8:
539 switch (hcd->speed) {
540 case HCD_USB3:
541 bufp = ss_rh_config_descriptor;
542 len = sizeof ss_rh_config_descriptor;
543 break;
544 case HCD_USB2:
545 bufp = hs_rh_config_descriptor;
546 len = sizeof hs_rh_config_descriptor;
547 break;
548 case HCD_USB11:
549 bufp = fs_rh_config_descriptor;
550 len = sizeof fs_rh_config_descriptor;
551 break;
552 default:
553 goto error;
554 }
555 if (device_can_wakeup(&hcd->self.root_hub->dev))
556 patch_wakeup = 1;
557 break;
558 case USB_DT_STRING << 8:
559 if ((wValue & 0xff) < 4)
560 urb->actual_length = rh_string(wValue & 0xff,
561 hcd, ubuf, wLength);
562 else /* unsupported IDs --> "protocol stall" */
563 goto error;
564 break;
565 default:
566 goto error;
567 }
568 break;
569 case DeviceRequest | USB_REQ_GET_INTERFACE:
570 tbuf [0] = 0;
571 len = 1;
572 /* FALLTHROUGH */
573 case DeviceOutRequest | USB_REQ_SET_INTERFACE:
574 break;
575 case DeviceOutRequest | USB_REQ_SET_ADDRESS:
576 // wValue == urb->dev->devaddr
577 dev_dbg (hcd->self.controller, "root hub device address %d\n",
578 wValue);
579 break;
580
581 /* INTERFACE REQUESTS (no defined feature/status flags) */
582
583 /* ENDPOINT REQUESTS */
584
585 case EndpointRequest | USB_REQ_GET_STATUS:
586 // ENDPOINT_HALT flag
587 tbuf [0] = 0;
588 tbuf [1] = 0;
589 len = 2;
590 /* FALLTHROUGH */
591 case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
592 case EndpointOutRequest | USB_REQ_SET_FEATURE:
593 dev_dbg (hcd->self.controller, "no endpoint features yet\n");
594 break;
595
596 /* CLASS REQUESTS (and errors) */
597
598 default:
599 /* non-generic request */
600 switch (typeReq) {
601 case GetHubStatus:
602 case GetPortStatus:
603 len = 4;
604 break;
605 case GetHubDescriptor:
606 len = sizeof (struct usb_hub_descriptor);
607 break;
608 }
609 status = hcd->driver->hub_control (hcd,
610 typeReq, wValue, wIndex,
611 tbuf, wLength);
612 break;
613error:
614 /* "protocol stall" on error */
615 status = -EPIPE;
616 }
617
618 if (status) {
619 len = 0;
620 if (status != -EPIPE) {
621 dev_dbg (hcd->self.controller,
622 "CTRL: TypeReq=0x%x val=0x%x "
623 "idx=0x%x len=%d ==> %d\n",
624 typeReq, wValue, wIndex,
625 wLength, status);
626 }
627 }
628 if (len) {
629 if (urb->transfer_buffer_length < len)
630 len = urb->transfer_buffer_length;
631 urb->actual_length = len;
632 // always USB_DIR_IN, toward host
633 memcpy (ubuf, bufp, len);
634
635 /* report whether RH hardware supports remote wakeup */
636 if (patch_wakeup &&
637 len > offsetof (struct usb_config_descriptor,
638 bmAttributes))
639 ((struct usb_config_descriptor *)ubuf)->bmAttributes
640 |= USB_CONFIG_ATT_WAKEUP;
641
642 /* report whether RH hardware has an integrated TT */
643 if (patch_protocol &&
644 len > offsetof(struct usb_device_descriptor,
645 bDeviceProtocol))
646 ((struct usb_device_descriptor *) ubuf)->
647 bDeviceProtocol = 1;
648 }
649
650 /* any errors get returned through the urb completion */
651 spin_lock_irq(&hcd_root_hub_lock);
652 usb_hcd_unlink_urb_from_ep(hcd, urb);
653
654 /* This peculiar use of spinlocks echoes what real HC drivers do.
655 * Avoiding calls to local_irq_disable/enable makes the code
656 * RT-friendly.
657 */
658 spin_unlock(&hcd_root_hub_lock);
659 usb_hcd_giveback_urb(hcd, urb, status);
660 spin_lock(&hcd_root_hub_lock);
661
662 spin_unlock_irq(&hcd_root_hub_lock);
663 return 0;
664}
665
666/*-------------------------------------------------------------------------*/
667
668/*
669 * Root Hub interrupt transfers are polled using a timer if the
670 * driver requests it; otherwise the driver is responsible for
671 * calling usb_hcd_poll_rh_status() when an event occurs.
672 *
673 * Completions are called in_interrupt(), but they may or may not
674 * be in_irq().
675 */
676void usb_hcd_poll_rh_status(struct usb_hcd *hcd)
677{
678 struct urb *urb;
679 int length;
680 unsigned long flags;
681 char buffer[6]; /* Any root hubs with > 31 ports? */
682
683 if (unlikely(!hcd->rh_pollable))
684 return;
685 if (!hcd->uses_new_polling && !hcd->status_urb)
686 return;
687
688 length = hcd->driver->hub_status_data(hcd, buffer);
689 if (length > 0) {
690
691 /* try to complete the status urb */
692 spin_lock_irqsave(&hcd_root_hub_lock, flags);
693 urb = hcd->status_urb;
694 if (urb) {
695 clear_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
696 hcd->status_urb = NULL;
697 urb->actual_length = length;
698 memcpy(urb->transfer_buffer, buffer, length);
699
700 usb_hcd_unlink_urb_from_ep(hcd, urb);
701 spin_unlock(&hcd_root_hub_lock);
702 usb_hcd_giveback_urb(hcd, urb, 0);
703 spin_lock(&hcd_root_hub_lock);
704 } else {
705 length = 0;
706 set_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
707 }
708 spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
709 }
710
711 /* The USB 2.0 spec says 256 ms. This is close enough and won't
712 * exceed that limit if HZ is 100. The math is more clunky than
713 * maybe expected, this is to make sure that all timers for USB devices
714 * fire at the same time to give the CPU a break in between */
715 if (hcd->uses_new_polling ? HCD_POLL_RH(hcd) :
716 (length == 0 && hcd->status_urb != NULL))
717 mod_timer (&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));
718}
719EXPORT_SYMBOL_GPL(usb_hcd_poll_rh_status);
720
721/* timer callback */
722static void rh_timer_func (unsigned long _hcd)
723{
724 usb_hcd_poll_rh_status((struct usb_hcd *) _hcd);
725}
726
727/*-------------------------------------------------------------------------*/
728
729static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb)
730{
731 int retval;
732 unsigned long flags;
733 unsigned len = 1 + (urb->dev->maxchild / 8);
734
735 spin_lock_irqsave (&hcd_root_hub_lock, flags);
736 if (hcd->status_urb || urb->transfer_buffer_length < len) {
737 dev_dbg (hcd->self.controller, "not queuing rh status urb\n");
738 retval = -EINVAL;
739 goto done;
740 }
741
742 retval = usb_hcd_link_urb_to_ep(hcd, urb);
743 if (retval)
744 goto done;
745
746 hcd->status_urb = urb;
747 urb->hcpriv = hcd; /* indicate it's queued */
748 if (!hcd->uses_new_polling)
749 mod_timer(&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));
750
751 /* If a status change has already occurred, report it ASAP */
752 else if (HCD_POLL_PENDING(hcd))
753 mod_timer(&hcd->rh_timer, jiffies);
754 retval = 0;
755 done:
756 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
757 return retval;
758}
759
760static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb)
761{
762 if (usb_endpoint_xfer_int(&urb->ep->desc))
763 return rh_queue_status (hcd, urb);
764 if (usb_endpoint_xfer_control(&urb->ep->desc))
765 return rh_call_control (hcd, urb);
766 return -EINVAL;
767}
768
769/*-------------------------------------------------------------------------*/
770
771/* Unlinks of root-hub control URBs are legal, but they don't do anything
772 * since these URBs always execute synchronously.
773 */
774static int usb_rh_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
775{
776 unsigned long flags;
777 int rc;
778
779 spin_lock_irqsave(&hcd_root_hub_lock, flags);
780 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
781 if (rc)
782 goto done;
783
784 if (usb_endpoint_num(&urb->ep->desc) == 0) { /* Control URB */
785 ; /* Do nothing */
786
787 } else { /* Status URB */
788 if (!hcd->uses_new_polling)
789 del_timer (&hcd->rh_timer);
790 if (urb == hcd->status_urb) {
791 hcd->status_urb = NULL;
792 usb_hcd_unlink_urb_from_ep(hcd, urb);
793
794 spin_unlock(&hcd_root_hub_lock);
795 usb_hcd_giveback_urb(hcd, urb, status);
796 spin_lock(&hcd_root_hub_lock);
797 }
798 }
799 done:
800 spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
801 return rc;
802}
803
804
805
806/*
807 * Show & store the current value of authorized_default
808 */
809static ssize_t usb_host_authorized_default_show(struct device *dev,
810 struct device_attribute *attr,
811 char *buf)
812{
813 struct usb_device *rh_usb_dev = to_usb_device(dev);
814 struct usb_bus *usb_bus = rh_usb_dev->bus;
815 struct usb_hcd *usb_hcd;
816
817 if (usb_bus == NULL) /* FIXME: not sure if this case is possible */
818 return -ENODEV;
819 usb_hcd = bus_to_hcd(usb_bus);
820 return snprintf(buf, PAGE_SIZE, "%u\n", usb_hcd->authorized_default);
821}
822
823static ssize_t usb_host_authorized_default_store(struct device *dev,
824 struct device_attribute *attr,
825 const char *buf, size_t size)
826{
827 ssize_t result;
828 unsigned val;
829 struct usb_device *rh_usb_dev = to_usb_device(dev);
830 struct usb_bus *usb_bus = rh_usb_dev->bus;
831 struct usb_hcd *usb_hcd;
832
833 if (usb_bus == NULL) /* FIXME: not sure if this case is possible */
834 return -ENODEV;
835 usb_hcd = bus_to_hcd(usb_bus);
836 result = sscanf(buf, "%u\n", &val);
837 if (result == 1) {
838 usb_hcd->authorized_default = val? 1 : 0;
839 result = size;
840 }
841 else
842 result = -EINVAL;
843 return result;
844}
845
846static DEVICE_ATTR(authorized_default, 0644,
847 usb_host_authorized_default_show,
848 usb_host_authorized_default_store);
849
850
851/* Group all the USB bus attributes */
852static struct attribute *usb_bus_attrs[] = {
853 &dev_attr_authorized_default.attr,
854 NULL,
855};
856
857static struct attribute_group usb_bus_attr_group = {
858 .name = NULL, /* we want them in the same directory */
859 .attrs = usb_bus_attrs,
860};
861
862
863
864/*-------------------------------------------------------------------------*/
865
866/**
867 * usb_bus_init - shared initialization code
868 * @bus: the bus structure being initialized
869 *
870 * This code is used to initialize a usb_bus structure, memory for which is
871 * separately managed.
872 */
873static void usb_bus_init (struct usb_bus *bus)
874{
875 memset (&bus->devmap, 0, sizeof(struct usb_devmap));
876
877 bus->devnum_next = 1;
878
879 bus->root_hub = NULL;
880 bus->busnum = -1;
881 bus->bandwidth_allocated = 0;
882 bus->bandwidth_int_reqs = 0;
883 bus->bandwidth_isoc_reqs = 0;
884
885 INIT_LIST_HEAD (&bus->bus_list);
886}
887
888/*-------------------------------------------------------------------------*/
889
890/**
891 * usb_register_bus - registers the USB host controller with the usb core
892 * @bus: pointer to the bus to register
893 * Context: !in_interrupt()
894 *
895 * Assigns a bus number, and links the controller into usbcore data
896 * structures so that it can be seen by scanning the bus list.
897 */
898static int usb_register_bus(struct usb_bus *bus)
899{
900 int result = -E2BIG;
901 int busnum;
902
903 mutex_lock(&usb_bus_list_lock);
904 busnum = find_next_zero_bit (busmap.busmap, USB_MAXBUS, 1);
905 if (busnum >= USB_MAXBUS) {
906 printk (KERN_ERR "%s: too many buses\n", usbcore_name);
907 goto error_find_busnum;
908 }
909 set_bit (busnum, busmap.busmap);
910 bus->busnum = busnum;
911
912 /* Add it to the local list of buses */
913 list_add (&bus->bus_list, &usb_bus_list);
914 mutex_unlock(&usb_bus_list_lock);
915
916 usb_notify_add_bus(bus);
917
918 dev_info (bus->controller, "new USB bus registered, assigned bus "
919 "number %d\n", bus->busnum);
920 return 0;
921
922error_find_busnum:
923 mutex_unlock(&usb_bus_list_lock);
924 return result;
925}
926
927/**
928 * usb_deregister_bus - deregisters the USB host controller
929 * @bus: pointer to the bus to deregister
930 * Context: !in_interrupt()
931 *
932 * Recycles the bus number, and unlinks the controller from usbcore data
933 * structures so that it won't be seen by scanning the bus list.
934 */
935static void usb_deregister_bus (struct usb_bus *bus)
936{
937 dev_info (bus->controller, "USB bus %d deregistered\n", bus->busnum);
938
939 /*
940 * NOTE: make sure that all the devices are removed by the
941 * controller code, as well as having it call this when cleaning
942 * itself up
943 */
944 mutex_lock(&usb_bus_list_lock);
945 list_del (&bus->bus_list);
946 mutex_unlock(&usb_bus_list_lock);
947
948 usb_notify_remove_bus(bus);
949
950 clear_bit (bus->busnum, busmap.busmap);
951}
952
953/**
954 * register_root_hub - called by usb_add_hcd() to register a root hub
955 * @hcd: host controller for this root hub
956 *
957 * This function registers the root hub with the USB subsystem. It sets up
958 * the device properly in the device tree and then calls usb_new_device()
959 * to register the usb device. It also assigns the root hub's USB address
960 * (always 1).
961 */
962static int register_root_hub(struct usb_hcd *hcd)
963{
964 struct device *parent_dev = hcd->self.controller;
965 struct usb_device *usb_dev = hcd->self.root_hub;
966 const int devnum = 1;
967 int retval;
968
969 usb_dev->devnum = devnum;
970 usb_dev->bus->devnum_next = devnum + 1;
971 memset (&usb_dev->bus->devmap.devicemap, 0,
972 sizeof usb_dev->bus->devmap.devicemap);
973 set_bit (devnum, usb_dev->bus->devmap.devicemap);
974 usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
975
976 mutex_lock(&usb_bus_list_lock);
977
978 usb_dev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
979 retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE);
980 if (retval != sizeof usb_dev->descriptor) {
981 mutex_unlock(&usb_bus_list_lock);
982 dev_dbg (parent_dev, "can't read %s device descriptor %d\n",
983 dev_name(&usb_dev->dev), retval);
984 return (retval < 0) ? retval : -EMSGSIZE;
985 }
986
987 retval = usb_new_device (usb_dev);
988 if (retval) {
989 dev_err (parent_dev, "can't register root hub for %s, %d\n",
990 dev_name(&usb_dev->dev), retval);
991 }
992 mutex_unlock(&usb_bus_list_lock);
993
994 if (retval == 0) {
995 spin_lock_irq (&hcd_root_hub_lock);
996 hcd->rh_registered = 1;
997 spin_unlock_irq (&hcd_root_hub_lock);
998
999 /* Did the HC die before the root hub was registered? */
1000 if (HCD_DEAD(hcd))
1001 usb_hc_died (hcd); /* This time clean up */
1002 }
1003
1004 return retval;
1005}
1006
1007
1008/*-------------------------------------------------------------------------*/
1009
1010/**
1011 * usb_calc_bus_time - approximate periodic transaction time in nanoseconds
1012 * @speed: from dev->speed; USB_SPEED_{LOW,FULL,HIGH}
1013 * @is_input: true iff the transaction sends data to the host
1014 * @isoc: true for isochronous transactions, false for interrupt ones
1015 * @bytecount: how many bytes in the transaction.
1016 *
1017 * Returns approximate bus time in nanoseconds for a periodic transaction.
1018 * See USB 2.0 spec section 5.11.3; only periodic transfers need to be
1019 * scheduled in software, this function is only used for such scheduling.
1020 */
1021long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount)
1022{
1023 unsigned long tmp;
1024
1025 switch (speed) {
1026 case USB_SPEED_LOW: /* INTR only */
1027 if (is_input) {
1028 tmp = (67667L * (31L + 10L * BitTime (bytecount))) / 1000L;
1029 return (64060L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
1030 } else {
1031 tmp = (66700L * (31L + 10L * BitTime (bytecount))) / 1000L;
1032 return (64107L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
1033 }
1034 case USB_SPEED_FULL: /* ISOC or INTR */
1035 if (isoc) {
1036 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
1037 return (((is_input) ? 7268L : 6265L) + BW_HOST_DELAY + tmp);
1038 } else {
1039 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
1040 return (9107L + BW_HOST_DELAY + tmp);
1041 }
1042 case USB_SPEED_HIGH: /* ISOC or INTR */
1043 // FIXME adjust for input vs output
1044 if (isoc)
1045 tmp = HS_NSECS_ISO (bytecount);
1046 else
1047 tmp = HS_NSECS (bytecount);
1048 return tmp;
1049 default:
1050 pr_debug ("%s: bogus device speed!\n", usbcore_name);
1051 return -1;
1052 }
1053}
1054EXPORT_SYMBOL_GPL(usb_calc_bus_time);
1055
1056
1057/*-------------------------------------------------------------------------*/
1058
1059/*
1060 * Generic HC operations.
1061 */
1062
1063/*-------------------------------------------------------------------------*/
1064
1065/**
1066 * usb_hcd_link_urb_to_ep - add an URB to its endpoint queue
1067 * @hcd: host controller to which @urb was submitted
1068 * @urb: URB being submitted
1069 *
1070 * Host controller drivers should call this routine in their enqueue()
1071 * method. The HCD's private spinlock must be held and interrupts must
1072 * be disabled. The actions carried out here are required for URB
1073 * submission, as well as for endpoint shutdown and for usb_kill_urb.
1074 *
1075 * Returns 0 for no error, otherwise a negative error code (in which case
1076 * the enqueue() method must fail). If no error occurs but enqueue() fails
1077 * anyway, it must call usb_hcd_unlink_urb_from_ep() before releasing
1078 * the private spinlock and returning.
1079 */
1080int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb)
1081{
1082 int rc = 0;
1083
1084 spin_lock(&hcd_urb_list_lock);
1085
1086 /* Check that the URB isn't being killed */
1087 if (unlikely(atomic_read(&urb->reject))) {
1088 rc = -EPERM;
1089 goto done;
1090 }
1091
1092 if (unlikely(!urb->ep->enabled)) {
1093 rc = -ENOENT;
1094 goto done;
1095 }
1096
1097 if (unlikely(!urb->dev->can_submit)) {
1098 rc = -EHOSTUNREACH;
1099 goto done;
1100 }
1101
1102 /*
1103 * Check the host controller's state and add the URB to the
1104 * endpoint's queue.
1105 */
1106 if (HCD_RH_RUNNING(hcd)) {
1107 urb->unlinked = 0;
1108 list_add_tail(&urb->urb_list, &urb->ep->urb_list);
1109 } else {
1110 rc = -ESHUTDOWN;
1111 goto done;
1112 }
1113 done:
1114 spin_unlock(&hcd_urb_list_lock);
1115 return rc;
1116}
1117EXPORT_SYMBOL_GPL(usb_hcd_link_urb_to_ep);
1118
1119/**
1120 * usb_hcd_check_unlink_urb - check whether an URB may be unlinked
1121 * @hcd: host controller to which @urb was submitted
1122 * @urb: URB being checked for unlinkability
1123 * @status: error code to store in @urb if the unlink succeeds
1124 *
1125 * Host controller drivers should call this routine in their dequeue()
1126 * method. The HCD's private spinlock must be held and interrupts must
1127 * be disabled. The actions carried out here are required for making
1128 * sure than an unlink is valid.
1129 *
1130 * Returns 0 for no error, otherwise a negative error code (in which case
1131 * the dequeue() method must fail). The possible error codes are:
1132 *
1133 * -EIDRM: @urb was not submitted or has already completed.
1134 * The completion function may not have been called yet.
1135 *
1136 * -EBUSY: @urb has already been unlinked.
1137 */
1138int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
1139 int status)
1140{
1141 struct list_head *tmp;
1142
1143 /* insist the urb is still queued */
1144 list_for_each(tmp, &urb->ep->urb_list) {
1145 if (tmp == &urb->urb_list)
1146 break;
1147 }
1148 if (tmp != &urb->urb_list)
1149 return -EIDRM;
1150
1151 /* Any status except -EINPROGRESS means something already started to
1152 * unlink this URB from the hardware. So there's no more work to do.
1153 */
1154 if (urb->unlinked)
1155 return -EBUSY;
1156 urb->unlinked = status;
1157
1158 /* IRQ setup can easily be broken so that USB controllers
1159 * never get completion IRQs ... maybe even the ones we need to
1160 * finish unlinking the initial failed usb_set_address()
1161 * or device descriptor fetch.
1162 */
1163 if (!HCD_SAW_IRQ(hcd) && !is_root_hub(urb->dev)) {
1164 dev_warn(hcd->self.controller, "Unlink after no-IRQ? "
1165 "Controller is probably using the wrong IRQ.\n");
1166 set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
1167 if (hcd->shared_hcd)
1168 set_bit(HCD_FLAG_SAW_IRQ, &hcd->shared_hcd->flags);
1169 }
1170
1171 return 0;
1172}
1173EXPORT_SYMBOL_GPL(usb_hcd_check_unlink_urb);
1174
1175/**
1176 * usb_hcd_unlink_urb_from_ep - remove an URB from its endpoint queue
1177 * @hcd: host controller to which @urb was submitted
1178 * @urb: URB being unlinked
1179 *
1180 * Host controller drivers should call this routine before calling
1181 * usb_hcd_giveback_urb(). The HCD's private spinlock must be held and
1182 * interrupts must be disabled. The actions carried out here are required
1183 * for URB completion.
1184 */
1185void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb)
1186{
1187 /* clear all state linking urb to this dev (and hcd) */
1188 spin_lock(&hcd_urb_list_lock);
1189 list_del_init(&urb->urb_list);
1190 spin_unlock(&hcd_urb_list_lock);
1191}
1192EXPORT_SYMBOL_GPL(usb_hcd_unlink_urb_from_ep);
1193
1194/*
1195 * Some usb host controllers can only perform dma using a small SRAM area.
1196 * The usb core itself is however optimized for host controllers that can dma
1197 * using regular system memory - like pci devices doing bus mastering.
1198 *
1199 * To support host controllers with limited dma capabilites we provide dma
1200 * bounce buffers. This feature can be enabled using the HCD_LOCAL_MEM flag.
1201 * For this to work properly the host controller code must first use the
1202 * function dma_declare_coherent_memory() to point out which memory area
1203 * that should be used for dma allocations.
1204 *
1205 * The HCD_LOCAL_MEM flag then tells the usb code to allocate all data for
1206 * dma using dma_alloc_coherent() which in turn allocates from the memory
1207 * area pointed out with dma_declare_coherent_memory().
1208 *
1209 * So, to summarize...
1210 *
1211 * - We need "local" memory, canonical example being
1212 * a small SRAM on a discrete controller being the
1213 * only memory that the controller can read ...
1214 * (a) "normal" kernel memory is no good, and
1215 * (b) there's not enough to share
1216 *
1217 * - The only *portable* hook for such stuff in the
1218 * DMA framework is dma_declare_coherent_memory()
1219 *
1220 * - So we use that, even though the primary requirement
1221 * is that the memory be "local" (hence addressible
1222 * by that device), not "coherent".
1223 *
1224 */
1225
1226static int hcd_alloc_coherent(struct usb_bus *bus,
1227 gfp_t mem_flags, dma_addr_t *dma_handle,
1228 void **vaddr_handle, size_t size,
1229 enum dma_data_direction dir)
1230{
1231 unsigned char *vaddr;
1232
1233 if (*vaddr_handle == NULL) {
1234 WARN_ON_ONCE(1);
1235 return -EFAULT;
1236 }
1237
1238 vaddr = hcd_buffer_alloc(bus, size + sizeof(vaddr),
1239 mem_flags, dma_handle);
1240 if (!vaddr)
1241 return -ENOMEM;
1242
1243 /*
1244 * Store the virtual address of the buffer at the end
1245 * of the allocated dma buffer. The size of the buffer
1246 * may be uneven so use unaligned functions instead
1247 * of just rounding up. It makes sense to optimize for
1248 * memory footprint over access speed since the amount
1249 * of memory available for dma may be limited.
1250 */
1251 put_unaligned((unsigned long)*vaddr_handle,
1252 (unsigned long *)(vaddr + size));
1253
1254 if (dir == DMA_TO_DEVICE)
1255 memcpy(vaddr, *vaddr_handle, size);
1256
1257 *vaddr_handle = vaddr;
1258 return 0;
1259}
1260
1261static void hcd_free_coherent(struct usb_bus *bus, dma_addr_t *dma_handle,
1262 void **vaddr_handle, size_t size,
1263 enum dma_data_direction dir)
1264{
1265 unsigned char *vaddr = *vaddr_handle;
1266
1267 vaddr = (void *)get_unaligned((unsigned long *)(vaddr + size));
1268
1269 if (dir == DMA_FROM_DEVICE)
1270 memcpy(vaddr, *vaddr_handle, size);
1271
1272 hcd_buffer_free(bus, size + sizeof(vaddr), *vaddr_handle, *dma_handle);
1273
1274 *vaddr_handle = vaddr;
1275 *dma_handle = 0;
1276}
1277
1278void usb_hcd_unmap_urb_setup_for_dma(struct usb_hcd *hcd, struct urb *urb)
1279{
1280 if (urb->transfer_flags & URB_SETUP_MAP_SINGLE)
1281 dma_unmap_single(hcd->self.controller,
1282 urb->setup_dma,
1283 sizeof(struct usb_ctrlrequest),
1284 DMA_TO_DEVICE);
1285 else if (urb->transfer_flags & URB_SETUP_MAP_LOCAL)
1286 hcd_free_coherent(urb->dev->bus,
1287 &urb->setup_dma,
1288 (void **) &urb->setup_packet,
1289 sizeof(struct usb_ctrlrequest),
1290 DMA_TO_DEVICE);
1291
1292 /* Make it safe to call this routine more than once */
1293 urb->transfer_flags &= ~(URB_SETUP_MAP_SINGLE | URB_SETUP_MAP_LOCAL);
1294}
1295EXPORT_SYMBOL_GPL(usb_hcd_unmap_urb_setup_for_dma);
1296
1297static void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
1298{
1299 if (hcd->driver->unmap_urb_for_dma)
1300 hcd->driver->unmap_urb_for_dma(hcd, urb);
1301 else
1302 usb_hcd_unmap_urb_for_dma(hcd, urb);
1303}
1304
1305void usb_hcd_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
1306{
1307 enum dma_data_direction dir;
1308
1309 usb_hcd_unmap_urb_setup_for_dma(hcd, urb);
1310
1311 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
1312 if (urb->transfer_flags & URB_DMA_MAP_SG)
1313 dma_unmap_sg(hcd->self.controller,
1314 urb->sg,
1315 urb->num_sgs,
1316 dir);
1317 else if (urb->transfer_flags & URB_DMA_MAP_PAGE)
1318 dma_unmap_page(hcd->self.controller,
1319 urb->transfer_dma,
1320 urb->transfer_buffer_length,
1321 dir);
1322 else if (urb->transfer_flags & URB_DMA_MAP_SINGLE)
1323 dma_unmap_single(hcd->self.controller,
1324 urb->transfer_dma,
1325 urb->transfer_buffer_length,
1326 dir);
1327 else if (urb->transfer_flags & URB_MAP_LOCAL)
1328 hcd_free_coherent(urb->dev->bus,
1329 &urb->transfer_dma,
1330 &urb->transfer_buffer,
1331 urb->transfer_buffer_length,
1332 dir);
1333
1334 /* Make it safe to call this routine more than once */
1335 urb->transfer_flags &= ~(URB_DMA_MAP_SG | URB_DMA_MAP_PAGE |
1336 URB_DMA_MAP_SINGLE | URB_MAP_LOCAL);
1337}
1338EXPORT_SYMBOL_GPL(usb_hcd_unmap_urb_for_dma);
1339
1340static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
1341 gfp_t mem_flags)
1342{
1343 if (hcd->driver->map_urb_for_dma)
1344 return hcd->driver->map_urb_for_dma(hcd, urb, mem_flags);
1345 else
1346 return usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
1347}
1348
1349int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
1350 gfp_t mem_flags)
1351{
1352 enum dma_data_direction dir;
1353 int ret = 0;
1354
1355 /* Map the URB's buffers for DMA access.
1356 * Lower level HCD code should use *_dma exclusively,
1357 * unless it uses pio or talks to another transport,
1358 * or uses the provided scatter gather list for bulk.
1359 */
1360
1361 if (usb_endpoint_xfer_control(&urb->ep->desc)) {
1362 if (hcd->self.uses_pio_for_control)
1363 return ret;
1364 if (hcd->self.uses_dma) {
1365 urb->setup_dma = dma_map_single(
1366 hcd->self.controller,
1367 urb->setup_packet,
1368 sizeof(struct usb_ctrlrequest),
1369 DMA_TO_DEVICE);
1370 if (dma_mapping_error(hcd->self.controller,
1371 urb->setup_dma))
1372 return -EAGAIN;
1373 urb->transfer_flags |= URB_SETUP_MAP_SINGLE;
1374 } else if (hcd->driver->flags & HCD_LOCAL_MEM) {
1375 ret = hcd_alloc_coherent(
1376 urb->dev->bus, mem_flags,
1377 &urb->setup_dma,
1378 (void **)&urb->setup_packet,
1379 sizeof(struct usb_ctrlrequest),
1380 DMA_TO_DEVICE);
1381 if (ret)
1382 return ret;
1383 urb->transfer_flags |= URB_SETUP_MAP_LOCAL;
1384 }
1385 }
1386
1387 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
1388 if (urb->transfer_buffer_length != 0
1389 && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) {
1390 if (hcd->self.uses_dma) {
1391 if (urb->num_sgs) {
1392 int n = dma_map_sg(
1393 hcd->self.controller,
1394 urb->sg,
1395 urb->num_sgs,
1396 dir);
1397 if (n <= 0)
1398 ret = -EAGAIN;
1399 else
1400 urb->transfer_flags |= URB_DMA_MAP_SG;
1401 if (n != urb->num_sgs) {
1402 urb->num_sgs = n;
1403 urb->transfer_flags |=
1404 URB_DMA_SG_COMBINED;
1405 }
1406 } else if (urb->sg) {
1407 struct scatterlist *sg = urb->sg;
1408 urb->transfer_dma = dma_map_page(
1409 hcd->self.controller,
1410 sg_page(sg),
1411 sg->offset,
1412 urb->transfer_buffer_length,
1413 dir);
1414 if (dma_mapping_error(hcd->self.controller,
1415 urb->transfer_dma))
1416 ret = -EAGAIN;
1417 else
1418 urb->transfer_flags |= URB_DMA_MAP_PAGE;
1419 } else {
1420 urb->transfer_dma = dma_map_single(
1421 hcd->self.controller,
1422 urb->transfer_buffer,
1423 urb->transfer_buffer_length,
1424 dir);
1425 if (dma_mapping_error(hcd->self.controller,
1426 urb->transfer_dma))
1427 ret = -EAGAIN;
1428 else
1429 urb->transfer_flags |= URB_DMA_MAP_SINGLE;
1430 }
1431 } else if (hcd->driver->flags & HCD_LOCAL_MEM) {
1432 ret = hcd_alloc_coherent(
1433 urb->dev->bus, mem_flags,
1434 &urb->transfer_dma,
1435 &urb->transfer_buffer,
1436 urb->transfer_buffer_length,
1437 dir);
1438 if (ret == 0)
1439 urb->transfer_flags |= URB_MAP_LOCAL;
1440 }
1441 if (ret && (urb->transfer_flags & (URB_SETUP_MAP_SINGLE |
1442 URB_SETUP_MAP_LOCAL)))
1443 usb_hcd_unmap_urb_for_dma(hcd, urb);
1444 }
1445 return ret;
1446}
1447EXPORT_SYMBOL_GPL(usb_hcd_map_urb_for_dma);
1448
1449/*-------------------------------------------------------------------------*/
1450
1451/* may be called in any context with a valid urb->dev usecount
1452 * caller surrenders "ownership" of urb
1453 * expects usb_submit_urb() to have sanity checked and conditioned all
1454 * inputs in the urb
1455 */
1456int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
1457{
1458 int status;
1459 struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus);
1460
1461 /* increment urb's reference count as part of giving it to the HCD
1462 * (which will control it). HCD guarantees that it either returns
1463 * an error or calls giveback(), but not both.
1464 */
1465 usb_get_urb(urb);
1466 atomic_inc(&urb->use_count);
1467 atomic_inc(&urb->dev->urbnum);
1468 usbmon_urb_submit(&hcd->self, urb);
1469
1470 /* NOTE requirements on root-hub callers (usbfs and the hub
1471 * driver, for now): URBs' urb->transfer_buffer must be
1472 * valid and usb_buffer_{sync,unmap}() not be needed, since
1473 * they could clobber root hub response data. Also, control
1474 * URBs must be submitted in process context with interrupts
1475 * enabled.
1476 */
1477
1478 if (is_root_hub(urb->dev)) {
1479 status = rh_urb_enqueue(hcd, urb);
1480 } else {
1481 status = map_urb_for_dma(hcd, urb, mem_flags);
1482 if (likely(status == 0)) {
1483 status = hcd->driver->urb_enqueue(hcd, urb, mem_flags);
1484 if (unlikely(status))
1485 unmap_urb_for_dma(hcd, urb);
1486 }
1487 }
1488
1489 if (unlikely(status)) {
1490 usbmon_urb_submit_error(&hcd->self, urb, status);
1491 urb->hcpriv = NULL;
1492 INIT_LIST_HEAD(&urb->urb_list);
1493 atomic_dec(&urb->use_count);
1494 atomic_dec(&urb->dev->urbnum);
1495 if (atomic_read(&urb->reject))
1496 wake_up(&usb_kill_urb_queue);
1497 usb_put_urb(urb);
1498 }
1499 return status;
1500}
1501
1502/*-------------------------------------------------------------------------*/
1503
1504/* this makes the hcd giveback() the urb more quickly, by kicking it
1505 * off hardware queues (which may take a while) and returning it as
1506 * soon as practical. we've already set up the urb's return status,
1507 * but we can't know if the callback completed already.
1508 */
1509static int unlink1(struct usb_hcd *hcd, struct urb *urb, int status)
1510{
1511 int value;
1512
1513 if (is_root_hub(urb->dev))
1514 value = usb_rh_urb_dequeue(hcd, urb, status);
1515 else {
1516
1517 /* The only reason an HCD might fail this call is if
1518 * it has not yet fully queued the urb to begin with.
1519 * Such failures should be harmless. */
1520 value = hcd->driver->urb_dequeue(hcd, urb, status);
1521 }
1522 return value;
1523}
1524
1525/*
1526 * called in any context
1527 *
1528 * caller guarantees urb won't be recycled till both unlink()
1529 * and the urb's completion function return
1530 */
1531int usb_hcd_unlink_urb (struct urb *urb, int status)
1532{
1533 struct usb_hcd *hcd;
1534 int retval = -EIDRM;
1535 unsigned long flags;
1536
1537 /* Prevent the device and bus from going away while
1538 * the unlink is carried out. If they are already gone
1539 * then urb->use_count must be 0, since disconnected
1540 * devices can't have any active URBs.
1541 */
1542 spin_lock_irqsave(&hcd_urb_unlink_lock, flags);
1543 if (atomic_read(&urb->use_count) > 0) {
1544 retval = 0;
1545 usb_get_dev(urb->dev);
1546 }
1547 spin_unlock_irqrestore(&hcd_urb_unlink_lock, flags);
1548 if (retval == 0) {
1549 hcd = bus_to_hcd(urb->dev->bus);
1550 retval = unlink1(hcd, urb, status);
1551 usb_put_dev(urb->dev);
1552 }
1553
1554 if (retval == 0)
1555 retval = -EINPROGRESS;
1556 else if (retval != -EIDRM && retval != -EBUSY)
1557 dev_dbg(&urb->dev->dev, "hcd_unlink_urb %p fail %d\n",
1558 urb, retval);
1559 return retval;
1560}
1561
1562/*-------------------------------------------------------------------------*/
1563
1564/**
1565 * usb_hcd_giveback_urb - return URB from HCD to device driver
1566 * @hcd: host controller returning the URB
1567 * @urb: urb being returned to the USB device driver.
1568 * @status: completion status code for the URB.
1569 * Context: in_interrupt()
1570 *
1571 * This hands the URB from HCD to its USB device driver, using its
1572 * completion function. The HCD has freed all per-urb resources
1573 * (and is done using urb->hcpriv). It also released all HCD locks;
1574 * the device driver won't cause problems if it frees, modifies,
1575 * or resubmits this URB.
1576 *
1577 * If @urb was unlinked, the value of @status will be overridden by
1578 * @urb->unlinked. Erroneous short transfers are detected in case
1579 * the HCD hasn't checked for them.
1580 */
1581void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb, int status)
1582{
1583 urb->hcpriv = NULL;
1584 if (unlikely(urb->unlinked))
1585 status = urb->unlinked;
1586 else if (unlikely((urb->transfer_flags & URB_SHORT_NOT_OK) &&
1587 urb->actual_length < urb->transfer_buffer_length &&
1588 !status))
1589 status = -EREMOTEIO;
1590
1591 unmap_urb_for_dma(hcd, urb);
1592 usbmon_urb_complete(&hcd->self, urb, status);
1593 usb_unanchor_urb(urb);
1594
1595 /* pass ownership to the completion handler */
1596 urb->status = status;
1597 urb->complete (urb);
1598 atomic_dec (&urb->use_count);
1599 if (unlikely(atomic_read(&urb->reject)))
1600 wake_up (&usb_kill_urb_queue);
1601 usb_put_urb (urb);
1602}
1603EXPORT_SYMBOL_GPL(usb_hcd_giveback_urb);
1604
1605/*-------------------------------------------------------------------------*/
1606
1607/* Cancel all URBs pending on this endpoint and wait for the endpoint's
1608 * queue to drain completely. The caller must first insure that no more
1609 * URBs can be submitted for this endpoint.
1610 */
1611void usb_hcd_flush_endpoint(struct usb_device *udev,
1612 struct usb_host_endpoint *ep)
1613{
1614 struct usb_hcd *hcd;
1615 struct urb *urb;
1616
1617 if (!ep)
1618 return;
1619 might_sleep();
1620 hcd = bus_to_hcd(udev->bus);
1621
1622 /* No more submits can occur */
1623 spin_lock_irq(&hcd_urb_list_lock);
1624rescan:
1625 list_for_each_entry (urb, &ep->urb_list, urb_list) {
1626 int is_in;
1627
1628 if (urb->unlinked)
1629 continue;
1630 usb_get_urb (urb);
1631 is_in = usb_urb_dir_in(urb);
1632 spin_unlock(&hcd_urb_list_lock);
1633
1634 /* kick hcd */
1635 unlink1(hcd, urb, -ESHUTDOWN);
1636 dev_dbg (hcd->self.controller,
1637 "shutdown urb %p ep%d%s%s\n",
1638 urb, usb_endpoint_num(&ep->desc),
1639 is_in ? "in" : "out",
1640 ({ char *s;
1641
1642 switch (usb_endpoint_type(&ep->desc)) {
1643 case USB_ENDPOINT_XFER_CONTROL:
1644 s = ""; break;
1645 case USB_ENDPOINT_XFER_BULK:
1646 s = "-bulk"; break;
1647 case USB_ENDPOINT_XFER_INT:
1648 s = "-intr"; break;
1649 default:
1650 s = "-iso"; break;
1651 };
1652 s;
1653 }));
1654 usb_put_urb (urb);
1655
1656 /* list contents may have changed */
1657 spin_lock(&hcd_urb_list_lock);
1658 goto rescan;
1659 }
1660 spin_unlock_irq(&hcd_urb_list_lock);
1661
1662 /* Wait until the endpoint queue is completely empty */
1663 while (!list_empty (&ep->urb_list)) {
1664 spin_lock_irq(&hcd_urb_list_lock);
1665
1666 /* The list may have changed while we acquired the spinlock */
1667 urb = NULL;
1668 if (!list_empty (&ep->urb_list)) {
1669 urb = list_entry (ep->urb_list.prev, struct urb,
1670 urb_list);
1671 usb_get_urb (urb);
1672 }
1673 spin_unlock_irq(&hcd_urb_list_lock);
1674
1675 if (urb) {
1676 usb_kill_urb (urb);
1677 usb_put_urb (urb);
1678 }
1679 }
1680}
1681
1682/**
1683 * usb_hcd_alloc_bandwidth - check whether a new bandwidth setting exceeds
1684 * the bus bandwidth
1685 * @udev: target &usb_device
1686 * @new_config: new configuration to install
1687 * @cur_alt: the current alternate interface setting
1688 * @new_alt: alternate interface setting that is being installed
1689 *
1690 * To change configurations, pass in the new configuration in new_config,
1691 * and pass NULL for cur_alt and new_alt.
1692 *
1693 * To reset a device's configuration (put the device in the ADDRESSED state),
1694 * pass in NULL for new_config, cur_alt, and new_alt.
1695 *
1696 * To change alternate interface settings, pass in NULL for new_config,
1697 * pass in the current alternate interface setting in cur_alt,
1698 * and pass in the new alternate interface setting in new_alt.
1699 *
1700 * Returns an error if the requested bandwidth change exceeds the
1701 * bus bandwidth or host controller internal resources.
1702 */
1703int usb_hcd_alloc_bandwidth(struct usb_device *udev,
1704 struct usb_host_config *new_config,
1705 struct usb_host_interface *cur_alt,
1706 struct usb_host_interface *new_alt)
1707{
1708 int num_intfs, i, j;
1709 struct usb_host_interface *alt = NULL;
1710 int ret = 0;
1711 struct usb_hcd *hcd;
1712 struct usb_host_endpoint *ep;
1713
1714 hcd = bus_to_hcd(udev->bus);
1715 if (!hcd->driver->check_bandwidth)
1716 return 0;
1717
1718 /* Configuration is being removed - set configuration 0 */
1719 if (!new_config && !cur_alt) {
1720 for (i = 1; i < 16; ++i) {
1721 ep = udev->ep_out[i];
1722 if (ep)
1723 hcd->driver->drop_endpoint(hcd, udev, ep);
1724 ep = udev->ep_in[i];
1725 if (ep)
1726 hcd->driver->drop_endpoint(hcd, udev, ep);
1727 }
1728 hcd->driver->check_bandwidth(hcd, udev);
1729 return 0;
1730 }
1731 /* Check if the HCD says there's enough bandwidth. Enable all endpoints
1732 * each interface's alt setting 0 and ask the HCD to check the bandwidth
1733 * of the bus. There will always be bandwidth for endpoint 0, so it's
1734 * ok to exclude it.
1735 */
1736 if (new_config) {
1737 num_intfs = new_config->desc.bNumInterfaces;
1738 /* Remove endpoints (except endpoint 0, which is always on the
1739 * schedule) from the old config from the schedule
1740 */
1741 for (i = 1; i < 16; ++i) {
1742 ep = udev->ep_out[i];
1743 if (ep) {
1744 ret = hcd->driver->drop_endpoint(hcd, udev, ep);
1745 if (ret < 0)
1746 goto reset;
1747 }
1748 ep = udev->ep_in[i];
1749 if (ep) {
1750 ret = hcd->driver->drop_endpoint(hcd, udev, ep);
1751 if (ret < 0)
1752 goto reset;
1753 }
1754 }
1755 for (i = 0; i < num_intfs; ++i) {
1756 struct usb_host_interface *first_alt;
1757 int iface_num;
1758
1759 first_alt = &new_config->intf_cache[i]->altsetting[0];
1760 iface_num = first_alt->desc.bInterfaceNumber;
1761 /* Set up endpoints for alternate interface setting 0 */
1762 alt = usb_find_alt_setting(new_config, iface_num, 0);
1763 if (!alt)
1764 /* No alt setting 0? Pick the first setting. */
1765 alt = first_alt;
1766
1767 for (j = 0; j < alt->desc.bNumEndpoints; j++) {
1768 ret = hcd->driver->add_endpoint(hcd, udev, &alt->endpoint[j]);
1769 if (ret < 0)
1770 goto reset;
1771 }
1772 }
1773 }
1774 if (cur_alt && new_alt) {
1775 struct usb_interface *iface = usb_ifnum_to_if(udev,
1776 cur_alt->desc.bInterfaceNumber);
1777
1778 if (!iface)
1779 return -EINVAL;
1780 if (iface->resetting_device) {
1781 /*
1782 * The USB core just reset the device, so the xHCI host
1783 * and the device will think alt setting 0 is installed.
1784 * However, the USB core will pass in the alternate
1785 * setting installed before the reset as cur_alt. Dig
1786 * out the alternate setting 0 structure, or the first
1787 * alternate setting if a broken device doesn't have alt
1788 * setting 0.
1789 */
1790 cur_alt = usb_altnum_to_altsetting(iface, 0);
1791 if (!cur_alt)
1792 cur_alt = &iface->altsetting[0];
1793 }
1794
1795 /* Drop all the endpoints in the current alt setting */
1796 for (i = 0; i < cur_alt->desc.bNumEndpoints; i++) {
1797 ret = hcd->driver->drop_endpoint(hcd, udev,
1798 &cur_alt->endpoint[i]);
1799 if (ret < 0)
1800 goto reset;
1801 }
1802 /* Add all the endpoints in the new alt setting */
1803 for (i = 0; i < new_alt->desc.bNumEndpoints; i++) {
1804 ret = hcd->driver->add_endpoint(hcd, udev,
1805 &new_alt->endpoint[i]);
1806 if (ret < 0)
1807 goto reset;
1808 }
1809 }
1810 ret = hcd->driver->check_bandwidth(hcd, udev);
1811reset:
1812 if (ret < 0)
1813 hcd->driver->reset_bandwidth(hcd, udev);
1814 return ret;
1815}
1816
1817/* Disables the endpoint: synchronizes with the hcd to make sure all
1818 * endpoint state is gone from hardware. usb_hcd_flush_endpoint() must
1819 * have been called previously. Use for set_configuration, set_interface,
1820 * driver removal, physical disconnect.
1821 *
1822 * example: a qh stored in ep->hcpriv, holding state related to endpoint
1823 * type, maxpacket size, toggle, halt status, and scheduling.
1824 */
1825void usb_hcd_disable_endpoint(struct usb_device *udev,
1826 struct usb_host_endpoint *ep)
1827{
1828 struct usb_hcd *hcd;
1829
1830 might_sleep();
1831 hcd = bus_to_hcd(udev->bus);
1832 if (hcd->driver->endpoint_disable)
1833 hcd->driver->endpoint_disable(hcd, ep);
1834}
1835
1836/**
1837 * usb_hcd_reset_endpoint - reset host endpoint state
1838 * @udev: USB device.
1839 * @ep: the endpoint to reset.
1840 *
1841 * Resets any host endpoint state such as the toggle bit, sequence
1842 * number and current window.
1843 */
1844void usb_hcd_reset_endpoint(struct usb_device *udev,
1845 struct usb_host_endpoint *ep)
1846{
1847 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
1848
1849 if (hcd->driver->endpoint_reset)
1850 hcd->driver->endpoint_reset(hcd, ep);
1851 else {
1852 int epnum = usb_endpoint_num(&ep->desc);
1853 int is_out = usb_endpoint_dir_out(&ep->desc);
1854 int is_control = usb_endpoint_xfer_control(&ep->desc);
1855
1856 usb_settoggle(udev, epnum, is_out, 0);
1857 if (is_control)
1858 usb_settoggle(udev, epnum, !is_out, 0);
1859 }
1860}
1861
1862/**
1863 * usb_alloc_streams - allocate bulk endpoint stream IDs.
1864 * @interface: alternate setting that includes all endpoints.
1865 * @eps: array of endpoints that need streams.
1866 * @num_eps: number of endpoints in the array.
1867 * @num_streams: number of streams to allocate.
1868 * @mem_flags: flags hcd should use to allocate memory.
1869 *
1870 * Sets up a group of bulk endpoints to have num_streams stream IDs available.
1871 * Drivers may queue multiple transfers to different stream IDs, which may
1872 * complete in a different order than they were queued.
1873 */
1874int usb_alloc_streams(struct usb_interface *interface,
1875 struct usb_host_endpoint **eps, unsigned int num_eps,
1876 unsigned int num_streams, gfp_t mem_flags)
1877{
1878 struct usb_hcd *hcd;
1879 struct usb_device *dev;
1880 int i;
1881
1882 dev = interface_to_usbdev(interface);
1883 hcd = bus_to_hcd(dev->bus);
1884 if (!hcd->driver->alloc_streams || !hcd->driver->free_streams)
1885 return -EINVAL;
1886 if (dev->speed != USB_SPEED_SUPER)
1887 return -EINVAL;
1888
1889 /* Streams only apply to bulk endpoints. */
1890 for (i = 0; i < num_eps; i++)
1891 if (!usb_endpoint_xfer_bulk(&eps[i]->desc))
1892 return -EINVAL;
1893
1894 return hcd->driver->alloc_streams(hcd, dev, eps, num_eps,
1895 num_streams, mem_flags);
1896}
1897EXPORT_SYMBOL_GPL(usb_alloc_streams);
1898
1899/**
1900 * usb_free_streams - free bulk endpoint stream IDs.
1901 * @interface: alternate setting that includes all endpoints.
1902 * @eps: array of endpoints to remove streams from.
1903 * @num_eps: number of endpoints in the array.
1904 * @mem_flags: flags hcd should use to allocate memory.
1905 *
1906 * Reverts a group of bulk endpoints back to not using stream IDs.
1907 * Can fail if we are given bad arguments, or HCD is broken.
1908 */
1909void usb_free_streams(struct usb_interface *interface,
1910 struct usb_host_endpoint **eps, unsigned int num_eps,
1911 gfp_t mem_flags)
1912{
1913 struct usb_hcd *hcd;
1914 struct usb_device *dev;
1915 int i;
1916
1917 dev = interface_to_usbdev(interface);
1918 hcd = bus_to_hcd(dev->bus);
1919 if (dev->speed != USB_SPEED_SUPER)
1920 return;
1921
1922 /* Streams only apply to bulk endpoints. */
1923 for (i = 0; i < num_eps; i++)
1924 if (!eps[i] || !usb_endpoint_xfer_bulk(&eps[i]->desc))
1925 return;
1926
1927 hcd->driver->free_streams(hcd, dev, eps, num_eps, mem_flags);
1928}
1929EXPORT_SYMBOL_GPL(usb_free_streams);
1930
1931/* Protect against drivers that try to unlink URBs after the device
1932 * is gone, by waiting until all unlinks for @udev are finished.
1933 * Since we don't currently track URBs by device, simply wait until
1934 * nothing is running in the locked region of usb_hcd_unlink_urb().
1935 */
1936void usb_hcd_synchronize_unlinks(struct usb_device *udev)
1937{
1938 spin_lock_irq(&hcd_urb_unlink_lock);
1939 spin_unlock_irq(&hcd_urb_unlink_lock);
1940}
1941
1942/*-------------------------------------------------------------------------*/
1943
1944/* called in any context */
1945int usb_hcd_get_frame_number (struct usb_device *udev)
1946{
1947 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
1948
1949 if (!HCD_RH_RUNNING(hcd))
1950 return -ESHUTDOWN;
1951 return hcd->driver->get_frame_number (hcd);
1952}
1953
1954/*-------------------------------------------------------------------------*/
1955
1956#ifdef CONFIG_PM
1957
1958int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)
1959{
1960 struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self);
1961 int status;
1962 int old_state = hcd->state;
1963
1964 dev_dbg(&rhdev->dev, "bus %s%s\n",
1965 (msg.event & PM_EVENT_AUTO ? "auto-" : ""), "suspend");
1966 if (HCD_DEAD(hcd)) {
1967 dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "suspend");
1968 return 0;
1969 }
1970
1971 if (!hcd->driver->bus_suspend) {
1972 status = -ENOENT;
1973 } else {
1974 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
1975 hcd->state = HC_STATE_QUIESCING;
1976 status = hcd->driver->bus_suspend(hcd);
1977 }
1978 if (status == 0) {
1979 usb_set_device_state(rhdev, USB_STATE_SUSPENDED);
1980 hcd->state = HC_STATE_SUSPENDED;
1981 } else {
1982 spin_lock_irq(&hcd_root_hub_lock);
1983 if (!HCD_DEAD(hcd)) {
1984 set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
1985 hcd->state = old_state;
1986 }
1987 spin_unlock_irq(&hcd_root_hub_lock);
1988 dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
1989 "suspend", status);
1990 }
1991 return status;
1992}
1993
1994int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
1995{
1996 struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self);
1997 int status;
1998 int old_state = hcd->state;
1999
2000 dev_dbg(&rhdev->dev, "usb %s%s\n",
2001 (msg.event & PM_EVENT_AUTO ? "auto-" : ""), "resume");
2002 if (HCD_DEAD(hcd)) {
2003 dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "resume");
2004 return 0;
2005 }
2006 if (!hcd->driver->bus_resume)
2007 return -ENOENT;
2008 if (HCD_RH_RUNNING(hcd))
2009 return 0;
2010
2011 hcd->state = HC_STATE_RESUMING;
2012 status = hcd->driver->bus_resume(hcd);
2013 clear_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
2014 if (status == 0) {
2015 /* TRSMRCY = 10 msec */
2016 msleep(10);
2017 spin_lock_irq(&hcd_root_hub_lock);
2018 if (!HCD_DEAD(hcd)) {
2019 usb_set_device_state(rhdev, rhdev->actconfig
2020 ? USB_STATE_CONFIGURED
2021 : USB_STATE_ADDRESS);
2022 set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2023 hcd->state = HC_STATE_RUNNING;
2024 }
2025 spin_unlock_irq(&hcd_root_hub_lock);
2026 } else {
2027 hcd->state = old_state;
2028 dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
2029 "resume", status);
2030 if (status != -ESHUTDOWN)
2031 usb_hc_died(hcd);
2032 }
2033 return status;
2034}
2035
2036#endif /* CONFIG_PM */
2037
2038#ifdef CONFIG_USB_SUSPEND
2039
2040/* Workqueue routine for root-hub remote wakeup */
2041static void hcd_resume_work(struct work_struct *work)
2042{
2043 struct usb_hcd *hcd = container_of(work, struct usb_hcd, wakeup_work);
2044 struct usb_device *udev = hcd->self.root_hub;
2045
2046 usb_lock_device(udev);
2047 usb_remote_wakeup(udev);
2048 usb_unlock_device(udev);
2049}
2050
2051/**
2052 * usb_hcd_resume_root_hub - called by HCD to resume its root hub
2053 * @hcd: host controller for this root hub
2054 *
2055 * The USB host controller calls this function when its root hub is
2056 * suspended (with the remote wakeup feature enabled) and a remote
2057 * wakeup request is received. The routine submits a workqueue request
2058 * to resume the root hub (that is, manage its downstream ports again).
2059 */
2060void usb_hcd_resume_root_hub (struct usb_hcd *hcd)
2061{
2062 unsigned long flags;
2063
2064 spin_lock_irqsave (&hcd_root_hub_lock, flags);
2065 if (hcd->rh_registered) {
2066 set_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
2067 queue_work(pm_wq, &hcd->wakeup_work);
2068 }
2069 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
2070}
2071EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub);
2072
2073#endif /* CONFIG_USB_SUSPEND */
2074
2075/*-------------------------------------------------------------------------*/
2076
2077#ifdef CONFIG_USB_OTG
2078
2079/**
2080 * usb_bus_start_enum - start immediate enumeration (for OTG)
2081 * @bus: the bus (must use hcd framework)
2082 * @port_num: 1-based number of port; usually bus->otg_port
2083 * Context: in_interrupt()
2084 *
2085 * Starts enumeration, with an immediate reset followed later by
2086 * khubd identifying and possibly configuring the device.
2087 * This is needed by OTG controller drivers, where it helps meet
2088 * HNP protocol timing requirements for starting a port reset.
2089 */
2090int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num)
2091{
2092 struct usb_hcd *hcd;
2093 int status = -EOPNOTSUPP;
2094
2095 /* NOTE: since HNP can't start by grabbing the bus's address0_sem,
2096 * boards with root hubs hooked up to internal devices (instead of
2097 * just the OTG port) may need more attention to resetting...
2098 */
2099 hcd = container_of (bus, struct usb_hcd, self);
2100 if (port_num && hcd->driver->start_port_reset)
2101 status = hcd->driver->start_port_reset(hcd, port_num);
2102
2103 /* run khubd shortly after (first) root port reset finishes;
2104 * it may issue others, until at least 50 msecs have passed.
2105 */
2106 if (status == 0)
2107 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10));
2108 return status;
2109}
2110EXPORT_SYMBOL_GPL(usb_bus_start_enum);
2111
2112#endif
2113
2114/*-------------------------------------------------------------------------*/
2115
2116/**
2117 * usb_hcd_irq - hook IRQs to HCD framework (bus glue)
2118 * @irq: the IRQ being raised
2119 * @__hcd: pointer to the HCD whose IRQ is being signaled
2120 *
2121 * If the controller isn't HALTed, calls the driver's irq handler.
2122 * Checks whether the controller is now dead.
2123 */
2124irqreturn_t usb_hcd_irq (int irq, void *__hcd)
2125{
2126 struct usb_hcd *hcd = __hcd;
2127 unsigned long flags;
2128 irqreturn_t rc;
2129
2130 /* IRQF_DISABLED doesn't work correctly with shared IRQs
2131 * when the first handler doesn't use it. So let's just
2132 * assume it's never used.
2133 */
2134 local_irq_save(flags);
2135
2136 if (unlikely(HCD_DEAD(hcd) || !HCD_HW_ACCESSIBLE(hcd))) {
2137 rc = IRQ_NONE;
2138 } else if (hcd->driver->irq(hcd) == IRQ_NONE) {
2139 rc = IRQ_NONE;
2140 } else {
2141 set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
2142 if (hcd->shared_hcd)
2143 set_bit(HCD_FLAG_SAW_IRQ, &hcd->shared_hcd->flags);
2144 rc = IRQ_HANDLED;
2145 }
2146
2147 local_irq_restore(flags);
2148 return rc;
2149}
2150EXPORT_SYMBOL_GPL(usb_hcd_irq);
2151
2152/*-------------------------------------------------------------------------*/
2153
2154/**
2155 * usb_hc_died - report abnormal shutdown of a host controller (bus glue)
2156 * @hcd: pointer to the HCD representing the controller
2157 *
2158 * This is called by bus glue to report a USB host controller that died
2159 * while operations may still have been pending. It's called automatically
2160 * by the PCI glue, so only glue for non-PCI busses should need to call it.
2161 *
2162 * Only call this function with the primary HCD.
2163 */
2164void usb_hc_died (struct usb_hcd *hcd)
2165{
2166 unsigned long flags;
2167
2168 dev_err (hcd->self.controller, "HC died; cleaning up\n");
2169
2170 spin_lock_irqsave (&hcd_root_hub_lock, flags);
2171 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2172 set_bit(HCD_FLAG_DEAD, &hcd->flags);
2173 if (hcd->rh_registered) {
2174 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2175
2176 /* make khubd clean up old urbs and devices */
2177 usb_set_device_state (hcd->self.root_hub,
2178 USB_STATE_NOTATTACHED);
2179 usb_kick_khubd (hcd->self.root_hub);
2180 }
2181 if (usb_hcd_is_primary_hcd(hcd) && hcd->shared_hcd) {
2182 hcd = hcd->shared_hcd;
2183 if (hcd->rh_registered) {
2184 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2185
2186 /* make khubd clean up old urbs and devices */
2187 usb_set_device_state(hcd->self.root_hub,
2188 USB_STATE_NOTATTACHED);
2189 usb_kick_khubd(hcd->self.root_hub);
2190 }
2191 }
2192 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
2193 /* Make sure that the other roothub is also deallocated. */
2194}
2195EXPORT_SYMBOL_GPL (usb_hc_died);
2196
2197/*-------------------------------------------------------------------------*/
2198
2199/**
2200 * usb_create_shared_hcd - create and initialize an HCD structure
2201 * @driver: HC driver that will use this hcd
2202 * @dev: device for this HC, stored in hcd->self.controller
2203 * @bus_name: value to store in hcd->self.bus_name
2204 * @primary_hcd: a pointer to the usb_hcd structure that is sharing the
2205 * PCI device. Only allocate certain resources for the primary HCD
2206 * Context: !in_interrupt()
2207 *
2208 * Allocate a struct usb_hcd, with extra space at the end for the
2209 * HC driver's private data. Initialize the generic members of the
2210 * hcd structure.
2211 *
2212 * If memory is unavailable, returns NULL.
2213 */
2214struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
2215 struct device *dev, const char *bus_name,
2216 struct usb_hcd *primary_hcd)
2217{
2218 struct usb_hcd *hcd;
2219
2220 hcd = kzalloc(sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL);
2221 if (!hcd) {
2222 dev_dbg (dev, "hcd alloc failed\n");
2223 return NULL;
2224 }
2225 if (primary_hcd == NULL) {
2226 hcd->bandwidth_mutex = kmalloc(sizeof(*hcd->bandwidth_mutex),
2227 GFP_KERNEL);
2228 if (!hcd->bandwidth_mutex) {
2229 kfree(hcd);
2230 dev_dbg(dev, "hcd bandwidth mutex alloc failed\n");
2231 return NULL;
2232 }
2233 mutex_init(hcd->bandwidth_mutex);
2234 dev_set_drvdata(dev, hcd);
2235 } else {
2236 hcd->bandwidth_mutex = primary_hcd->bandwidth_mutex;
2237 hcd->primary_hcd = primary_hcd;
2238 primary_hcd->primary_hcd = primary_hcd;
2239 hcd->shared_hcd = primary_hcd;
2240 primary_hcd->shared_hcd = hcd;
2241 }
2242
2243 kref_init(&hcd->kref);
2244
2245 usb_bus_init(&hcd->self);
2246 hcd->self.controller = dev;
2247 hcd->self.bus_name = bus_name;
2248 hcd->self.uses_dma = (dev->dma_mask != NULL);
2249
2250 init_timer(&hcd->rh_timer);
2251 hcd->rh_timer.function = rh_timer_func;
2252 hcd->rh_timer.data = (unsigned long) hcd;
2253#ifdef CONFIG_USB_SUSPEND
2254 INIT_WORK(&hcd->wakeup_work, hcd_resume_work);
2255#endif
2256
2257 hcd->driver = driver;
2258 hcd->speed = driver->flags & HCD_MASK;
2259 hcd->product_desc = (driver->product_desc) ? driver->product_desc :
2260 "USB Host Controller";
2261 return hcd;
2262}
2263EXPORT_SYMBOL_GPL(usb_create_shared_hcd);
2264
2265/**
2266 * usb_create_hcd - create and initialize an HCD structure
2267 * @driver: HC driver that will use this hcd
2268 * @dev: device for this HC, stored in hcd->self.controller
2269 * @bus_name: value to store in hcd->self.bus_name
2270 * Context: !in_interrupt()
2271 *
2272 * Allocate a struct usb_hcd, with extra space at the end for the
2273 * HC driver's private data. Initialize the generic members of the
2274 * hcd structure.
2275 *
2276 * If memory is unavailable, returns NULL.
2277 */
2278struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
2279 struct device *dev, const char *bus_name)
2280{
2281 return usb_create_shared_hcd(driver, dev, bus_name, NULL);
2282}
2283EXPORT_SYMBOL_GPL(usb_create_hcd);
2284
2285/*
2286 * Roothubs that share one PCI device must also share the bandwidth mutex.
2287 * Don't deallocate the bandwidth_mutex until the last shared usb_hcd is
2288 * deallocated.
2289 *
2290 * Make sure to only deallocate the bandwidth_mutex when the primary HCD is
2291 * freed. When hcd_release() is called for the non-primary HCD, set the
2292 * primary_hcd's shared_hcd pointer to null (since the non-primary HCD will be
2293 * freed shortly).
2294 */
2295static void hcd_release (struct kref *kref)
2296{
2297 struct usb_hcd *hcd = container_of (kref, struct usb_hcd, kref);
2298
2299 if (usb_hcd_is_primary_hcd(hcd))
2300 kfree(hcd->bandwidth_mutex);
2301 else
2302 hcd->shared_hcd->shared_hcd = NULL;
2303 kfree(hcd);
2304}
2305
2306struct usb_hcd *usb_get_hcd (struct usb_hcd *hcd)
2307{
2308 if (hcd)
2309 kref_get (&hcd->kref);
2310 return hcd;
2311}
2312EXPORT_SYMBOL_GPL(usb_get_hcd);
2313
2314void usb_put_hcd (struct usb_hcd *hcd)
2315{
2316 if (hcd)
2317 kref_put (&hcd->kref, hcd_release);
2318}
2319EXPORT_SYMBOL_GPL(usb_put_hcd);
2320
2321int usb_hcd_is_primary_hcd(struct usb_hcd *hcd)
2322{
2323 if (!hcd->primary_hcd)
2324 return 1;
2325 return hcd == hcd->primary_hcd;
2326}
2327EXPORT_SYMBOL_GPL(usb_hcd_is_primary_hcd);
2328
2329static int usb_hcd_request_irqs(struct usb_hcd *hcd,
2330 unsigned int irqnum, unsigned long irqflags)
2331{
2332 int retval;
2333
2334 if (hcd->driver->irq) {
2335
2336 /* IRQF_DISABLED doesn't work as advertised when used together
2337 * with IRQF_SHARED. As usb_hcd_irq() will always disable
2338 * interrupts we can remove it here.
2339 */
2340 if (irqflags & IRQF_SHARED)
2341 irqflags &= ~IRQF_DISABLED;
2342
2343 snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d",
2344 hcd->driver->description, hcd->self.busnum);
2345 retval = request_irq(irqnum, &usb_hcd_irq, irqflags,
2346 hcd->irq_descr, hcd);
2347 if (retval != 0) {
2348 dev_err(hcd->self.controller,
2349 "request interrupt %d failed\n",
2350 irqnum);
2351 return retval;
2352 }
2353 hcd->irq = irqnum;
2354 dev_info(hcd->self.controller, "irq %d, %s 0x%08llx\n", irqnum,
2355 (hcd->driver->flags & HCD_MEMORY) ?
2356 "io mem" : "io base",
2357 (unsigned long long)hcd->rsrc_start);
2358 } else {
2359 hcd->irq = -1;
2360 if (hcd->rsrc_start)
2361 dev_info(hcd->self.controller, "%s 0x%08llx\n",
2362 (hcd->driver->flags & HCD_MEMORY) ?
2363 "io mem" : "io base",
2364 (unsigned long long)hcd->rsrc_start);
2365 }
2366 return 0;
2367}
2368
2369/**
2370 * usb_add_hcd - finish generic HCD structure initialization and register
2371 * @hcd: the usb_hcd structure to initialize
2372 * @irqnum: Interrupt line to allocate
2373 * @irqflags: Interrupt type flags
2374 *
2375 * Finish the remaining parts of generic HCD initialization: allocate the
2376 * buffers of consistent memory, register the bus, request the IRQ line,
2377 * and call the driver's reset() and start() routines.
2378 */
2379int usb_add_hcd(struct usb_hcd *hcd,
2380 unsigned int irqnum, unsigned long irqflags)
2381{
2382 int retval;
2383 struct usb_device *rhdev;
2384
2385 dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
2386
2387 /* Keep old behaviour if authorized_default is not in [0, 1]. */
2388 if (authorized_default < 0 || authorized_default > 1)
2389 hcd->authorized_default = hcd->wireless? 0 : 1;
2390 else
2391 hcd->authorized_default = authorized_default;
2392 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2393
2394 /* HC is in reset state, but accessible. Now do the one-time init,
2395 * bottom up so that hcds can customize the root hubs before khubd
2396 * starts talking to them. (Note, bus id is assigned early too.)
2397 */
2398 if ((retval = hcd_buffer_create(hcd)) != 0) {
2399 dev_dbg(hcd->self.controller, "pool alloc failed\n");
2400 return retval;
2401 }
2402
2403 if ((retval = usb_register_bus(&hcd->self)) < 0)
2404 goto err_register_bus;
2405
2406 if ((rhdev = usb_alloc_dev(NULL, &hcd->self, 0)) == NULL) {
2407 dev_err(hcd->self.controller, "unable to allocate root hub\n");
2408 retval = -ENOMEM;
2409 goto err_allocate_root_hub;
2410 }
2411 hcd->self.root_hub = rhdev;
2412
2413 switch (hcd->speed) {
2414 case HCD_USB11:
2415 rhdev->speed = USB_SPEED_FULL;
2416 break;
2417 case HCD_USB2:
2418 rhdev->speed = USB_SPEED_HIGH;
2419 break;
2420 case HCD_USB3:
2421 rhdev->speed = USB_SPEED_SUPER;
2422 break;
2423 default:
2424 retval = -EINVAL;
2425 goto err_set_rh_speed;
2426 }
2427
2428 /* wakeup flag init defaults to "everything works" for root hubs,
2429 * but drivers can override it in reset() if needed, along with
2430 * recording the overall controller's system wakeup capability.
2431 */
2432 device_init_wakeup(&rhdev->dev, 1);
2433
2434 /* HCD_FLAG_RH_RUNNING doesn't matter until the root hub is
2435 * registered. But since the controller can die at any time,
2436 * let's initialize the flag before touching the hardware.
2437 */
2438 set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2439
2440 /* "reset" is misnamed; its role is now one-time init. the controller
2441 * should already have been reset (and boot firmware kicked off etc).
2442 */
2443 if (hcd->driver->reset && (retval = hcd->driver->reset(hcd)) < 0) {
2444 dev_err(hcd->self.controller, "can't setup\n");
2445 goto err_hcd_driver_setup;
2446 }
2447 hcd->rh_pollable = 1;
2448
2449 /* NOTE: root hub and controller capabilities may not be the same */
2450 if (device_can_wakeup(hcd->self.controller)
2451 && device_can_wakeup(&hcd->self.root_hub->dev))
2452 dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
2453
2454 /* enable irqs just before we start the controller */
2455 if (usb_hcd_is_primary_hcd(hcd)) {
2456 retval = usb_hcd_request_irqs(hcd, irqnum, irqflags);
2457 if (retval)
2458 goto err_request_irq;
2459 }
2460
2461 hcd->state = HC_STATE_RUNNING;
2462 retval = hcd->driver->start(hcd);
2463 if (retval < 0) {
2464 dev_err(hcd->self.controller, "startup error %d\n", retval);
2465 goto err_hcd_driver_start;
2466 }
2467
2468 /* starting here, usbcore will pay attention to this root hub */
2469 rhdev->bus_mA = min(500u, hcd->power_budget);
2470 if ((retval = register_root_hub(hcd)) != 0)
2471 goto err_register_root_hub;
2472
2473 retval = sysfs_create_group(&rhdev->dev.kobj, &usb_bus_attr_group);
2474 if (retval < 0) {
2475 printk(KERN_ERR "Cannot register USB bus sysfs attributes: %d\n",
2476 retval);
2477 goto error_create_attr_group;
2478 }
2479 if (hcd->uses_new_polling && HCD_POLL_RH(hcd))
2480 usb_hcd_poll_rh_status(hcd);
2481 return retval;
2482
2483error_create_attr_group:
2484 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2485 if (HC_IS_RUNNING(hcd->state))
2486 hcd->state = HC_STATE_QUIESCING;
2487 spin_lock_irq(&hcd_root_hub_lock);
2488 hcd->rh_registered = 0;
2489 spin_unlock_irq(&hcd_root_hub_lock);
2490
2491#ifdef CONFIG_USB_SUSPEND
2492 cancel_work_sync(&hcd->wakeup_work);
2493#endif
2494 mutex_lock(&usb_bus_list_lock);
2495 usb_disconnect(&rhdev); /* Sets rhdev to NULL */
2496 mutex_unlock(&usb_bus_list_lock);
2497err_register_root_hub:
2498 hcd->rh_pollable = 0;
2499 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2500 del_timer_sync(&hcd->rh_timer);
2501 hcd->driver->stop(hcd);
2502 hcd->state = HC_STATE_HALT;
2503 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2504 del_timer_sync(&hcd->rh_timer);
2505err_hcd_driver_start:
2506 if (usb_hcd_is_primary_hcd(hcd) && hcd->irq >= 0)
2507 free_irq(irqnum, hcd);
2508err_request_irq:
2509err_hcd_driver_setup:
2510err_set_rh_speed:
2511 usb_put_dev(hcd->self.root_hub);
2512err_allocate_root_hub:
2513 usb_deregister_bus(&hcd->self);
2514err_register_bus:
2515 hcd_buffer_destroy(hcd);
2516 return retval;
2517}
2518EXPORT_SYMBOL_GPL(usb_add_hcd);
2519
2520/**
2521 * usb_remove_hcd - shutdown processing for generic HCDs
2522 * @hcd: the usb_hcd structure to remove
2523 * Context: !in_interrupt()
2524 *
2525 * Disconnects the root hub, then reverses the effects of usb_add_hcd(),
2526 * invoking the HCD's stop() method.
2527 */
2528void usb_remove_hcd(struct usb_hcd *hcd)
2529{
2530 struct usb_device *rhdev = hcd->self.root_hub;
2531
2532 dev_info(hcd->self.controller, "remove, state %x\n", hcd->state);
2533
2534 usb_get_dev(rhdev);
2535 sysfs_remove_group(&rhdev->dev.kobj, &usb_bus_attr_group);
2536
2537 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2538 if (HC_IS_RUNNING (hcd->state))
2539 hcd->state = HC_STATE_QUIESCING;
2540
2541 dev_dbg(hcd->self.controller, "roothub graceful disconnect\n");
2542 spin_lock_irq (&hcd_root_hub_lock);
2543 hcd->rh_registered = 0;
2544 spin_unlock_irq (&hcd_root_hub_lock);
2545
2546#ifdef CONFIG_USB_SUSPEND
2547 cancel_work_sync(&hcd->wakeup_work);
2548#endif
2549
2550 mutex_lock(&usb_bus_list_lock);
2551 usb_disconnect(&rhdev); /* Sets rhdev to NULL */
2552 mutex_unlock(&usb_bus_list_lock);
2553
2554 /* Prevent any more root-hub status calls from the timer.
2555 * The HCD might still restart the timer (if a port status change
2556 * interrupt occurs), but usb_hcd_poll_rh_status() won't invoke
2557 * the hub_status_data() callback.
2558 */
2559 hcd->rh_pollable = 0;
2560 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2561 del_timer_sync(&hcd->rh_timer);
2562
2563 hcd->driver->stop(hcd);
2564 hcd->state = HC_STATE_HALT;
2565
2566 /* In case the HCD restarted the timer, stop it again. */
2567 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2568 del_timer_sync(&hcd->rh_timer);
2569
2570 if (usb_hcd_is_primary_hcd(hcd)) {
2571 if (hcd->irq >= 0)
2572 free_irq(hcd->irq, hcd);
2573 }
2574
2575 usb_put_dev(hcd->self.root_hub);
2576 usb_deregister_bus(&hcd->self);
2577 hcd_buffer_destroy(hcd);
2578}
2579EXPORT_SYMBOL_GPL(usb_remove_hcd);
2580
2581void
2582usb_hcd_platform_shutdown(struct platform_device* dev)
2583{
2584 struct usb_hcd *hcd = platform_get_drvdata(dev);
2585
2586 if (hcd->driver->shutdown)
2587 hcd->driver->shutdown(hcd);
2588}
2589EXPORT_SYMBOL_GPL(usb_hcd_platform_shutdown);
2590
2591/*-------------------------------------------------------------------------*/
2592
2593#if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
2594
2595struct usb_mon_operations *mon_ops;
2596
2597/*
2598 * The registration is unlocked.
2599 * We do it this way because we do not want to lock in hot paths.
2600 *
2601 * Notice that the code is minimally error-proof. Because usbmon needs
2602 * symbols from usbcore, usbcore gets referenced and cannot be unloaded first.
2603 */
2604
2605int usb_mon_register (struct usb_mon_operations *ops)
2606{
2607
2608 if (mon_ops)
2609 return -EBUSY;
2610
2611 mon_ops = ops;
2612 mb();
2613 return 0;
2614}
2615EXPORT_SYMBOL_GPL (usb_mon_register);
2616
2617void usb_mon_deregister (void)
2618{
2619
2620 if (mon_ops == NULL) {
2621 printk(KERN_ERR "USB: monitor was not registered\n");
2622 return;
2623 }
2624 mon_ops = NULL;
2625 mb();
2626}
2627EXPORT_SYMBOL_GPL (usb_mon_deregister);
2628
2629#endif /* CONFIG_USB_MON || CONFIG_USB_MON_MODULE */
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * (C) Copyright Linus Torvalds 1999
4 * (C) Copyright Johannes Erdfelt 1999-2001
5 * (C) Copyright Andreas Gal 1999
6 * (C) Copyright Gregory P. Smith 1999
7 * (C) Copyright Deti Fliegl 1999
8 * (C) Copyright Randy Dunlap 2000
9 * (C) Copyright David Brownell 2000-2002
10 */
11
12#include <linux/bcd.h>
13#include <linux/module.h>
14#include <linux/version.h>
15#include <linux/kernel.h>
16#include <linux/sched/task_stack.h>
17#include <linux/slab.h>
18#include <linux/completion.h>
19#include <linux/utsname.h>
20#include <linux/mm.h>
21#include <asm/io.h>
22#include <linux/device.h>
23#include <linux/dma-mapping.h>
24#include <linux/mutex.h>
25#include <asm/irq.h>
26#include <asm/byteorder.h>
27#include <asm/unaligned.h>
28#include <linux/platform_device.h>
29#include <linux/workqueue.h>
30#include <linux/pm_runtime.h>
31#include <linux/types.h>
32#include <linux/genalloc.h>
33#include <linux/io.h>
34#include <linux/kcov.h>
35
36#include <linux/phy/phy.h>
37#include <linux/usb.h>
38#include <linux/usb/hcd.h>
39#include <linux/usb/otg.h>
40
41#include "usb.h"
42#include "phy.h"
43
44
45/*-------------------------------------------------------------------------*/
46
47/*
48 * USB Host Controller Driver framework
49 *
50 * Plugs into usbcore (usb_bus) and lets HCDs share code, minimizing
51 * HCD-specific behaviors/bugs.
52 *
53 * This does error checks, tracks devices and urbs, and delegates to a
54 * "hc_driver" only for code (and data) that really needs to know about
55 * hardware differences. That includes root hub registers, i/o queues,
56 * and so on ... but as little else as possible.
57 *
58 * Shared code includes most of the "root hub" code (these are emulated,
59 * though each HC's hardware works differently) and PCI glue, plus request
60 * tracking overhead. The HCD code should only block on spinlocks or on
61 * hardware handshaking; blocking on software events (such as other kernel
62 * threads releasing resources, or completing actions) is all generic.
63 *
64 * Happens the USB 2.0 spec says this would be invisible inside the "USBD",
65 * and includes mostly a "HCDI" (HCD Interface) along with some APIs used
66 * only by the hub driver ... and that neither should be seen or used by
67 * usb client device drivers.
68 *
69 * Contributors of ideas or unattributed patches include: David Brownell,
70 * Roman Weissgaerber, Rory Bolt, Greg Kroah-Hartman, ...
71 *
72 * HISTORY:
73 * 2002-02-21 Pull in most of the usb_bus support from usb.c; some
74 * associated cleanup. "usb_hcd" still != "usb_bus".
75 * 2001-12-12 Initial patch version for Linux 2.5.1 kernel.
76 */
77
78/*-------------------------------------------------------------------------*/
79
80/* Keep track of which host controller drivers are loaded */
81unsigned long usb_hcds_loaded;
82EXPORT_SYMBOL_GPL(usb_hcds_loaded);
83
84/* host controllers we manage */
85DEFINE_IDR (usb_bus_idr);
86EXPORT_SYMBOL_GPL (usb_bus_idr);
87
88/* used when allocating bus numbers */
89#define USB_MAXBUS 64
90
91/* used when updating list of hcds */
92DEFINE_MUTEX(usb_bus_idr_lock); /* exported only for usbfs */
93EXPORT_SYMBOL_GPL (usb_bus_idr_lock);
94
95/* used for controlling access to virtual root hubs */
96static DEFINE_SPINLOCK(hcd_root_hub_lock);
97
98/* used when updating an endpoint's URB list */
99static DEFINE_SPINLOCK(hcd_urb_list_lock);
100
101/* used to protect against unlinking URBs after the device is gone */
102static DEFINE_SPINLOCK(hcd_urb_unlink_lock);
103
104/* wait queue for synchronous unlinks */
105DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue);
106
107/*-------------------------------------------------------------------------*/
108
109/*
110 * Sharable chunks of root hub code.
111 */
112
113/*-------------------------------------------------------------------------*/
114#define KERNEL_REL bin2bcd(LINUX_VERSION_MAJOR)
115#define KERNEL_VER bin2bcd(LINUX_VERSION_PATCHLEVEL)
116
117/* usb 3.1 root hub device descriptor */
118static const u8 usb31_rh_dev_descriptor[18] = {
119 0x12, /* __u8 bLength; */
120 USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
121 0x10, 0x03, /* __le16 bcdUSB; v3.1 */
122
123 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
124 0x00, /* __u8 bDeviceSubClass; */
125 0x03, /* __u8 bDeviceProtocol; USB 3 hub */
126 0x09, /* __u8 bMaxPacketSize0; 2^9 = 512 Bytes */
127
128 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
129 0x03, 0x00, /* __le16 idProduct; device 0x0003 */
130 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
131
132 0x03, /* __u8 iManufacturer; */
133 0x02, /* __u8 iProduct; */
134 0x01, /* __u8 iSerialNumber; */
135 0x01 /* __u8 bNumConfigurations; */
136};
137
138/* usb 3.0 root hub device descriptor */
139static const u8 usb3_rh_dev_descriptor[18] = {
140 0x12, /* __u8 bLength; */
141 USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
142 0x00, 0x03, /* __le16 bcdUSB; v3.0 */
143
144 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
145 0x00, /* __u8 bDeviceSubClass; */
146 0x03, /* __u8 bDeviceProtocol; USB 3.0 hub */
147 0x09, /* __u8 bMaxPacketSize0; 2^9 = 512 Bytes */
148
149 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
150 0x03, 0x00, /* __le16 idProduct; device 0x0003 */
151 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
152
153 0x03, /* __u8 iManufacturer; */
154 0x02, /* __u8 iProduct; */
155 0x01, /* __u8 iSerialNumber; */
156 0x01 /* __u8 bNumConfigurations; */
157};
158
159/* usb 2.5 (wireless USB 1.0) root hub device descriptor */
160static const u8 usb25_rh_dev_descriptor[18] = {
161 0x12, /* __u8 bLength; */
162 USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
163 0x50, 0x02, /* __le16 bcdUSB; v2.5 */
164
165 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
166 0x00, /* __u8 bDeviceSubClass; */
167 0x00, /* __u8 bDeviceProtocol; [ usb 2.0 no TT ] */
168 0xFF, /* __u8 bMaxPacketSize0; always 0xFF (WUSB Spec 7.4.1). */
169
170 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
171 0x02, 0x00, /* __le16 idProduct; device 0x0002 */
172 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
173
174 0x03, /* __u8 iManufacturer; */
175 0x02, /* __u8 iProduct; */
176 0x01, /* __u8 iSerialNumber; */
177 0x01 /* __u8 bNumConfigurations; */
178};
179
180/* usb 2.0 root hub device descriptor */
181static const u8 usb2_rh_dev_descriptor[18] = {
182 0x12, /* __u8 bLength; */
183 USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
184 0x00, 0x02, /* __le16 bcdUSB; v2.0 */
185
186 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
187 0x00, /* __u8 bDeviceSubClass; */
188 0x00, /* __u8 bDeviceProtocol; [ usb 2.0 no TT ] */
189 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
190
191 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
192 0x02, 0x00, /* __le16 idProduct; device 0x0002 */
193 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
194
195 0x03, /* __u8 iManufacturer; */
196 0x02, /* __u8 iProduct; */
197 0x01, /* __u8 iSerialNumber; */
198 0x01 /* __u8 bNumConfigurations; */
199};
200
201/* no usb 2.0 root hub "device qualifier" descriptor: one speed only */
202
203/* usb 1.1 root hub device descriptor */
204static const u8 usb11_rh_dev_descriptor[18] = {
205 0x12, /* __u8 bLength; */
206 USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
207 0x10, 0x01, /* __le16 bcdUSB; v1.1 */
208
209 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
210 0x00, /* __u8 bDeviceSubClass; */
211 0x00, /* __u8 bDeviceProtocol; [ low/full speeds only ] */
212 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
213
214 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
215 0x01, 0x00, /* __le16 idProduct; device 0x0001 */
216 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
217
218 0x03, /* __u8 iManufacturer; */
219 0x02, /* __u8 iProduct; */
220 0x01, /* __u8 iSerialNumber; */
221 0x01 /* __u8 bNumConfigurations; */
222};
223
224
225/*-------------------------------------------------------------------------*/
226
227/* Configuration descriptors for our root hubs */
228
229static const u8 fs_rh_config_descriptor[] = {
230
231 /* one configuration */
232 0x09, /* __u8 bLength; */
233 USB_DT_CONFIG, /* __u8 bDescriptorType; Configuration */
234 0x19, 0x00, /* __le16 wTotalLength; */
235 0x01, /* __u8 bNumInterfaces; (1) */
236 0x01, /* __u8 bConfigurationValue; */
237 0x00, /* __u8 iConfiguration; */
238 0xc0, /* __u8 bmAttributes;
239 Bit 7: must be set,
240 6: Self-powered,
241 5: Remote wakeup,
242 4..0: resvd */
243 0x00, /* __u8 MaxPower; */
244
245 /* USB 1.1:
246 * USB 2.0, single TT organization (mandatory):
247 * one interface, protocol 0
248 *
249 * USB 2.0, multiple TT organization (optional):
250 * two interfaces, protocols 1 (like single TT)
251 * and 2 (multiple TT mode) ... config is
252 * sometimes settable
253 * NOT IMPLEMENTED
254 */
255
256 /* one interface */
257 0x09, /* __u8 if_bLength; */
258 USB_DT_INTERFACE, /* __u8 if_bDescriptorType; Interface */
259 0x00, /* __u8 if_bInterfaceNumber; */
260 0x00, /* __u8 if_bAlternateSetting; */
261 0x01, /* __u8 if_bNumEndpoints; */
262 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
263 0x00, /* __u8 if_bInterfaceSubClass; */
264 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
265 0x00, /* __u8 if_iInterface; */
266
267 /* one endpoint (status change endpoint) */
268 0x07, /* __u8 ep_bLength; */
269 USB_DT_ENDPOINT, /* __u8 ep_bDescriptorType; Endpoint */
270 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
271 0x03, /* __u8 ep_bmAttributes; Interrupt */
272 0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */
273 0xff /* __u8 ep_bInterval; (255ms -- usb 2.0 spec) */
274};
275
276static const u8 hs_rh_config_descriptor[] = {
277
278 /* one configuration */
279 0x09, /* __u8 bLength; */
280 USB_DT_CONFIG, /* __u8 bDescriptorType; Configuration */
281 0x19, 0x00, /* __le16 wTotalLength; */
282 0x01, /* __u8 bNumInterfaces; (1) */
283 0x01, /* __u8 bConfigurationValue; */
284 0x00, /* __u8 iConfiguration; */
285 0xc0, /* __u8 bmAttributes;
286 Bit 7: must be set,
287 6: Self-powered,
288 5: Remote wakeup,
289 4..0: resvd */
290 0x00, /* __u8 MaxPower; */
291
292 /* USB 1.1:
293 * USB 2.0, single TT organization (mandatory):
294 * one interface, protocol 0
295 *
296 * USB 2.0, multiple TT organization (optional):
297 * two interfaces, protocols 1 (like single TT)
298 * and 2 (multiple TT mode) ... config is
299 * sometimes settable
300 * NOT IMPLEMENTED
301 */
302
303 /* one interface */
304 0x09, /* __u8 if_bLength; */
305 USB_DT_INTERFACE, /* __u8 if_bDescriptorType; Interface */
306 0x00, /* __u8 if_bInterfaceNumber; */
307 0x00, /* __u8 if_bAlternateSetting; */
308 0x01, /* __u8 if_bNumEndpoints; */
309 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
310 0x00, /* __u8 if_bInterfaceSubClass; */
311 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
312 0x00, /* __u8 if_iInterface; */
313
314 /* one endpoint (status change endpoint) */
315 0x07, /* __u8 ep_bLength; */
316 USB_DT_ENDPOINT, /* __u8 ep_bDescriptorType; Endpoint */
317 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
318 0x03, /* __u8 ep_bmAttributes; Interrupt */
319 /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
320 * see hub.c:hub_configure() for details. */
321 (USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
322 0x0c /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
323};
324
325static const u8 ss_rh_config_descriptor[] = {
326 /* one configuration */
327 0x09, /* __u8 bLength; */
328 USB_DT_CONFIG, /* __u8 bDescriptorType; Configuration */
329 0x1f, 0x00, /* __le16 wTotalLength; */
330 0x01, /* __u8 bNumInterfaces; (1) */
331 0x01, /* __u8 bConfigurationValue; */
332 0x00, /* __u8 iConfiguration; */
333 0xc0, /* __u8 bmAttributes;
334 Bit 7: must be set,
335 6: Self-powered,
336 5: Remote wakeup,
337 4..0: resvd */
338 0x00, /* __u8 MaxPower; */
339
340 /* one interface */
341 0x09, /* __u8 if_bLength; */
342 USB_DT_INTERFACE, /* __u8 if_bDescriptorType; Interface */
343 0x00, /* __u8 if_bInterfaceNumber; */
344 0x00, /* __u8 if_bAlternateSetting; */
345 0x01, /* __u8 if_bNumEndpoints; */
346 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
347 0x00, /* __u8 if_bInterfaceSubClass; */
348 0x00, /* __u8 if_bInterfaceProtocol; */
349 0x00, /* __u8 if_iInterface; */
350
351 /* one endpoint (status change endpoint) */
352 0x07, /* __u8 ep_bLength; */
353 USB_DT_ENDPOINT, /* __u8 ep_bDescriptorType; Endpoint */
354 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
355 0x03, /* __u8 ep_bmAttributes; Interrupt */
356 /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
357 * see hub.c:hub_configure() for details. */
358 (USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
359 0x0c, /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
360
361 /* one SuperSpeed endpoint companion descriptor */
362 0x06, /* __u8 ss_bLength */
363 USB_DT_SS_ENDPOINT_COMP, /* __u8 ss_bDescriptorType; SuperSpeed EP */
364 /* Companion */
365 0x00, /* __u8 ss_bMaxBurst; allows 1 TX between ACKs */
366 0x00, /* __u8 ss_bmAttributes; 1 packet per service interval */
367 0x02, 0x00 /* __le16 ss_wBytesPerInterval; 15 bits for max 15 ports */
368};
369
370/* authorized_default behaviour:
371 * -1 is authorized for all devices except wireless (old behaviour)
372 * 0 is unauthorized for all devices
373 * 1 is authorized for all devices
374 * 2 is authorized for internal devices
375 */
376#define USB_AUTHORIZE_WIRED -1
377#define USB_AUTHORIZE_NONE 0
378#define USB_AUTHORIZE_ALL 1
379#define USB_AUTHORIZE_INTERNAL 2
380
381static int authorized_default = USB_AUTHORIZE_WIRED;
382module_param(authorized_default, int, S_IRUGO|S_IWUSR);
383MODULE_PARM_DESC(authorized_default,
384 "Default USB device authorization: 0 is not authorized, 1 is "
385 "authorized, 2 is authorized for internal devices, -1 is "
386 "authorized except for wireless USB (default, old behaviour)");
387/*-------------------------------------------------------------------------*/
388
389/**
390 * ascii2desc() - Helper routine for producing UTF-16LE string descriptors
391 * @s: Null-terminated ASCII (actually ISO-8859-1) string
392 * @buf: Buffer for USB string descriptor (header + UTF-16LE)
393 * @len: Length (in bytes; may be odd) of descriptor buffer.
394 *
395 * Return: The number of bytes filled in: 2 + 2*strlen(s) or @len,
396 * whichever is less.
397 *
398 * Note:
399 * USB String descriptors can contain at most 126 characters; input
400 * strings longer than that are truncated.
401 */
402static unsigned
403ascii2desc(char const *s, u8 *buf, unsigned len)
404{
405 unsigned n, t = 2 + 2*strlen(s);
406
407 if (t > 254)
408 t = 254; /* Longest possible UTF string descriptor */
409 if (len > t)
410 len = t;
411
412 t += USB_DT_STRING << 8; /* Now t is first 16 bits to store */
413
414 n = len;
415 while (n--) {
416 *buf++ = t;
417 if (!n--)
418 break;
419 *buf++ = t >> 8;
420 t = (unsigned char)*s++;
421 }
422 return len;
423}
424
425/**
426 * rh_string() - provides string descriptors for root hub
427 * @id: the string ID number (0: langids, 1: serial #, 2: product, 3: vendor)
428 * @hcd: the host controller for this root hub
429 * @data: buffer for output packet
430 * @len: length of the provided buffer
431 *
432 * Produces either a manufacturer, product or serial number string for the
433 * virtual root hub device.
434 *
435 * Return: The number of bytes filled in: the length of the descriptor or
436 * of the provided buffer, whichever is less.
437 */
438static unsigned
439rh_string(int id, struct usb_hcd const *hcd, u8 *data, unsigned len)
440{
441 char buf[100];
442 char const *s;
443 static char const langids[4] = {4, USB_DT_STRING, 0x09, 0x04};
444
445 /* language ids */
446 switch (id) {
447 case 0:
448 /* Array of LANGID codes (0x0409 is MSFT-speak for "en-us") */
449 /* See http://www.usb.org/developers/docs/USB_LANGIDs.pdf */
450 if (len > 4)
451 len = 4;
452 memcpy(data, langids, len);
453 return len;
454 case 1:
455 /* Serial number */
456 s = hcd->self.bus_name;
457 break;
458 case 2:
459 /* Product name */
460 s = hcd->product_desc;
461 break;
462 case 3:
463 /* Manufacturer */
464 snprintf (buf, sizeof buf, "%s %s %s", init_utsname()->sysname,
465 init_utsname()->release, hcd->driver->description);
466 s = buf;
467 break;
468 default:
469 /* Can't happen; caller guarantees it */
470 return 0;
471 }
472
473 return ascii2desc(s, data, len);
474}
475
476
477/* Root hub control transfers execute synchronously */
478static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
479{
480 struct usb_ctrlrequest *cmd;
481 u16 typeReq, wValue, wIndex, wLength;
482 u8 *ubuf = urb->transfer_buffer;
483 unsigned len = 0;
484 int status;
485 u8 patch_wakeup = 0;
486 u8 patch_protocol = 0;
487 u16 tbuf_size;
488 u8 *tbuf = NULL;
489 const u8 *bufp;
490
491 might_sleep();
492
493 spin_lock_irq(&hcd_root_hub_lock);
494 status = usb_hcd_link_urb_to_ep(hcd, urb);
495 spin_unlock_irq(&hcd_root_hub_lock);
496 if (status)
497 return status;
498 urb->hcpriv = hcd; /* Indicate it's queued */
499
500 cmd = (struct usb_ctrlrequest *) urb->setup_packet;
501 typeReq = (cmd->bRequestType << 8) | cmd->bRequest;
502 wValue = le16_to_cpu (cmd->wValue);
503 wIndex = le16_to_cpu (cmd->wIndex);
504 wLength = le16_to_cpu (cmd->wLength);
505
506 if (wLength > urb->transfer_buffer_length)
507 goto error;
508
509 /*
510 * tbuf should be at least as big as the
511 * USB hub descriptor.
512 */
513 tbuf_size = max_t(u16, sizeof(struct usb_hub_descriptor), wLength);
514 tbuf = kzalloc(tbuf_size, GFP_KERNEL);
515 if (!tbuf) {
516 status = -ENOMEM;
517 goto err_alloc;
518 }
519
520 bufp = tbuf;
521
522
523 urb->actual_length = 0;
524 switch (typeReq) {
525
526 /* DEVICE REQUESTS */
527
528 /* The root hub's remote wakeup enable bit is implemented using
529 * driver model wakeup flags. If this system supports wakeup
530 * through USB, userspace may change the default "allow wakeup"
531 * policy through sysfs or these calls.
532 *
533 * Most root hubs support wakeup from downstream devices, for
534 * runtime power management (disabling USB clocks and reducing
535 * VBUS power usage). However, not all of them do so; silicon,
536 * board, and BIOS bugs here are not uncommon, so these can't
537 * be treated quite like external hubs.
538 *
539 * Likewise, not all root hubs will pass wakeup events upstream,
540 * to wake up the whole system. So don't assume root hub and
541 * controller capabilities are identical.
542 */
543
544 case DeviceRequest | USB_REQ_GET_STATUS:
545 tbuf[0] = (device_may_wakeup(&hcd->self.root_hub->dev)
546 << USB_DEVICE_REMOTE_WAKEUP)
547 | (1 << USB_DEVICE_SELF_POWERED);
548 tbuf[1] = 0;
549 len = 2;
550 break;
551 case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
552 if (wValue == USB_DEVICE_REMOTE_WAKEUP)
553 device_set_wakeup_enable(&hcd->self.root_hub->dev, 0);
554 else
555 goto error;
556 break;
557 case DeviceOutRequest | USB_REQ_SET_FEATURE:
558 if (device_can_wakeup(&hcd->self.root_hub->dev)
559 && wValue == USB_DEVICE_REMOTE_WAKEUP)
560 device_set_wakeup_enable(&hcd->self.root_hub->dev, 1);
561 else
562 goto error;
563 break;
564 case DeviceRequest | USB_REQ_GET_CONFIGURATION:
565 tbuf[0] = 1;
566 len = 1;
567 fallthrough;
568 case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
569 break;
570 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
571 switch (wValue & 0xff00) {
572 case USB_DT_DEVICE << 8:
573 switch (hcd->speed) {
574 case HCD_USB32:
575 case HCD_USB31:
576 bufp = usb31_rh_dev_descriptor;
577 break;
578 case HCD_USB3:
579 bufp = usb3_rh_dev_descriptor;
580 break;
581 case HCD_USB25:
582 bufp = usb25_rh_dev_descriptor;
583 break;
584 case HCD_USB2:
585 bufp = usb2_rh_dev_descriptor;
586 break;
587 case HCD_USB11:
588 bufp = usb11_rh_dev_descriptor;
589 break;
590 default:
591 goto error;
592 }
593 len = 18;
594 if (hcd->has_tt)
595 patch_protocol = 1;
596 break;
597 case USB_DT_CONFIG << 8:
598 switch (hcd->speed) {
599 case HCD_USB32:
600 case HCD_USB31:
601 case HCD_USB3:
602 bufp = ss_rh_config_descriptor;
603 len = sizeof ss_rh_config_descriptor;
604 break;
605 case HCD_USB25:
606 case HCD_USB2:
607 bufp = hs_rh_config_descriptor;
608 len = sizeof hs_rh_config_descriptor;
609 break;
610 case HCD_USB11:
611 bufp = fs_rh_config_descriptor;
612 len = sizeof fs_rh_config_descriptor;
613 break;
614 default:
615 goto error;
616 }
617 if (device_can_wakeup(&hcd->self.root_hub->dev))
618 patch_wakeup = 1;
619 break;
620 case USB_DT_STRING << 8:
621 if ((wValue & 0xff) < 4)
622 urb->actual_length = rh_string(wValue & 0xff,
623 hcd, ubuf, wLength);
624 else /* unsupported IDs --> "protocol stall" */
625 goto error;
626 break;
627 case USB_DT_BOS << 8:
628 goto nongeneric;
629 default:
630 goto error;
631 }
632 break;
633 case DeviceRequest | USB_REQ_GET_INTERFACE:
634 tbuf[0] = 0;
635 len = 1;
636 fallthrough;
637 case DeviceOutRequest | USB_REQ_SET_INTERFACE:
638 break;
639 case DeviceOutRequest | USB_REQ_SET_ADDRESS:
640 /* wValue == urb->dev->devaddr */
641 dev_dbg (hcd->self.controller, "root hub device address %d\n",
642 wValue);
643 break;
644
645 /* INTERFACE REQUESTS (no defined feature/status flags) */
646
647 /* ENDPOINT REQUESTS */
648
649 case EndpointRequest | USB_REQ_GET_STATUS:
650 /* ENDPOINT_HALT flag */
651 tbuf[0] = 0;
652 tbuf[1] = 0;
653 len = 2;
654 fallthrough;
655 case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
656 case EndpointOutRequest | USB_REQ_SET_FEATURE:
657 dev_dbg (hcd->self.controller, "no endpoint features yet\n");
658 break;
659
660 /* CLASS REQUESTS (and errors) */
661
662 default:
663nongeneric:
664 /* non-generic request */
665 switch (typeReq) {
666 case GetHubStatus:
667 len = 4;
668 break;
669 case GetPortStatus:
670 if (wValue == HUB_PORT_STATUS)
671 len = 4;
672 else
673 /* other port status types return 8 bytes */
674 len = 8;
675 break;
676 case GetHubDescriptor:
677 len = sizeof (struct usb_hub_descriptor);
678 break;
679 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
680 /* len is returned by hub_control */
681 break;
682 }
683 status = hcd->driver->hub_control (hcd,
684 typeReq, wValue, wIndex,
685 tbuf, wLength);
686
687 if (typeReq == GetHubDescriptor)
688 usb_hub_adjust_deviceremovable(hcd->self.root_hub,
689 (struct usb_hub_descriptor *)tbuf);
690 break;
691error:
692 /* "protocol stall" on error */
693 status = -EPIPE;
694 }
695
696 if (status < 0) {
697 len = 0;
698 if (status != -EPIPE) {
699 dev_dbg (hcd->self.controller,
700 "CTRL: TypeReq=0x%x val=0x%x "
701 "idx=0x%x len=%d ==> %d\n",
702 typeReq, wValue, wIndex,
703 wLength, status);
704 }
705 } else if (status > 0) {
706 /* hub_control may return the length of data copied. */
707 len = status;
708 status = 0;
709 }
710 if (len) {
711 if (urb->transfer_buffer_length < len)
712 len = urb->transfer_buffer_length;
713 urb->actual_length = len;
714 /* always USB_DIR_IN, toward host */
715 memcpy (ubuf, bufp, len);
716
717 /* report whether RH hardware supports remote wakeup */
718 if (patch_wakeup &&
719 len > offsetof (struct usb_config_descriptor,
720 bmAttributes))
721 ((struct usb_config_descriptor *)ubuf)->bmAttributes
722 |= USB_CONFIG_ATT_WAKEUP;
723
724 /* report whether RH hardware has an integrated TT */
725 if (patch_protocol &&
726 len > offsetof(struct usb_device_descriptor,
727 bDeviceProtocol))
728 ((struct usb_device_descriptor *) ubuf)->
729 bDeviceProtocol = USB_HUB_PR_HS_SINGLE_TT;
730 }
731
732 kfree(tbuf);
733 err_alloc:
734
735 /* any errors get returned through the urb completion */
736 spin_lock_irq(&hcd_root_hub_lock);
737 usb_hcd_unlink_urb_from_ep(hcd, urb);
738 usb_hcd_giveback_urb(hcd, urb, status);
739 spin_unlock_irq(&hcd_root_hub_lock);
740 return 0;
741}
742
743/*-------------------------------------------------------------------------*/
744
745/*
746 * Root Hub interrupt transfers are polled using a timer if the
747 * driver requests it; otherwise the driver is responsible for
748 * calling usb_hcd_poll_rh_status() when an event occurs.
749 *
750 * Completion handler may not sleep. See usb_hcd_giveback_urb() for details.
751 */
752void usb_hcd_poll_rh_status(struct usb_hcd *hcd)
753{
754 struct urb *urb;
755 int length;
756 int status;
757 unsigned long flags;
758 char buffer[6]; /* Any root hubs with > 31 ports? */
759
760 if (unlikely(!hcd->rh_pollable))
761 return;
762 if (!hcd->uses_new_polling && !hcd->status_urb)
763 return;
764
765 length = hcd->driver->hub_status_data(hcd, buffer);
766 if (length > 0) {
767
768 /* try to complete the status urb */
769 spin_lock_irqsave(&hcd_root_hub_lock, flags);
770 urb = hcd->status_urb;
771 if (urb) {
772 clear_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
773 hcd->status_urb = NULL;
774 if (urb->transfer_buffer_length >= length) {
775 status = 0;
776 } else {
777 status = -EOVERFLOW;
778 length = urb->transfer_buffer_length;
779 }
780 urb->actual_length = length;
781 memcpy(urb->transfer_buffer, buffer, length);
782
783 usb_hcd_unlink_urb_from_ep(hcd, urb);
784 usb_hcd_giveback_urb(hcd, urb, status);
785 } else {
786 length = 0;
787 set_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
788 }
789 spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
790 }
791
792 /* The USB 2.0 spec says 256 ms. This is close enough and won't
793 * exceed that limit if HZ is 100. The math is more clunky than
794 * maybe expected, this is to make sure that all timers for USB devices
795 * fire at the same time to give the CPU a break in between */
796 if (hcd->uses_new_polling ? HCD_POLL_RH(hcd) :
797 (length == 0 && hcd->status_urb != NULL))
798 mod_timer (&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));
799}
800EXPORT_SYMBOL_GPL(usb_hcd_poll_rh_status);
801
802/* timer callback */
803static void rh_timer_func (struct timer_list *t)
804{
805 struct usb_hcd *_hcd = from_timer(_hcd, t, rh_timer);
806
807 usb_hcd_poll_rh_status(_hcd);
808}
809
810/*-------------------------------------------------------------------------*/
811
812static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb)
813{
814 int retval;
815 unsigned long flags;
816 unsigned len = 1 + (urb->dev->maxchild / 8);
817
818 spin_lock_irqsave (&hcd_root_hub_lock, flags);
819 if (hcd->status_urb || urb->transfer_buffer_length < len) {
820 dev_dbg (hcd->self.controller, "not queuing rh status urb\n");
821 retval = -EINVAL;
822 goto done;
823 }
824
825 retval = usb_hcd_link_urb_to_ep(hcd, urb);
826 if (retval)
827 goto done;
828
829 hcd->status_urb = urb;
830 urb->hcpriv = hcd; /* indicate it's queued */
831 if (!hcd->uses_new_polling)
832 mod_timer(&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));
833
834 /* If a status change has already occurred, report it ASAP */
835 else if (HCD_POLL_PENDING(hcd))
836 mod_timer(&hcd->rh_timer, jiffies);
837 retval = 0;
838 done:
839 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
840 return retval;
841}
842
843static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb)
844{
845 if (usb_endpoint_xfer_int(&urb->ep->desc))
846 return rh_queue_status (hcd, urb);
847 if (usb_endpoint_xfer_control(&urb->ep->desc))
848 return rh_call_control (hcd, urb);
849 return -EINVAL;
850}
851
852/*-------------------------------------------------------------------------*/
853
854/* Unlinks of root-hub control URBs are legal, but they don't do anything
855 * since these URBs always execute synchronously.
856 */
857static int usb_rh_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
858{
859 unsigned long flags;
860 int rc;
861
862 spin_lock_irqsave(&hcd_root_hub_lock, flags);
863 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
864 if (rc)
865 goto done;
866
867 if (usb_endpoint_num(&urb->ep->desc) == 0) { /* Control URB */
868 ; /* Do nothing */
869
870 } else { /* Status URB */
871 if (!hcd->uses_new_polling)
872 del_timer (&hcd->rh_timer);
873 if (urb == hcd->status_urb) {
874 hcd->status_urb = NULL;
875 usb_hcd_unlink_urb_from_ep(hcd, urb);
876 usb_hcd_giveback_urb(hcd, urb, status);
877 }
878 }
879 done:
880 spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
881 return rc;
882}
883
884
885/*-------------------------------------------------------------------------*/
886
887/**
888 * usb_bus_init - shared initialization code
889 * @bus: the bus structure being initialized
890 *
891 * This code is used to initialize a usb_bus structure, memory for which is
892 * separately managed.
893 */
894static void usb_bus_init (struct usb_bus *bus)
895{
896 memset (&bus->devmap, 0, sizeof(struct usb_devmap));
897
898 bus->devnum_next = 1;
899
900 bus->root_hub = NULL;
901 bus->busnum = -1;
902 bus->bandwidth_allocated = 0;
903 bus->bandwidth_int_reqs = 0;
904 bus->bandwidth_isoc_reqs = 0;
905 mutex_init(&bus->devnum_next_mutex);
906}
907
908/*-------------------------------------------------------------------------*/
909
910/**
911 * usb_register_bus - registers the USB host controller with the usb core
912 * @bus: pointer to the bus to register
913 *
914 * Context: task context, might sleep.
915 *
916 * Assigns a bus number, and links the controller into usbcore data
917 * structures so that it can be seen by scanning the bus list.
918 *
919 * Return: 0 if successful. A negative error code otherwise.
920 */
921static int usb_register_bus(struct usb_bus *bus)
922{
923 int result = -E2BIG;
924 int busnum;
925
926 mutex_lock(&usb_bus_idr_lock);
927 busnum = idr_alloc(&usb_bus_idr, bus, 1, USB_MAXBUS, GFP_KERNEL);
928 if (busnum < 0) {
929 pr_err("%s: failed to get bus number\n", usbcore_name);
930 goto error_find_busnum;
931 }
932 bus->busnum = busnum;
933 mutex_unlock(&usb_bus_idr_lock);
934
935 usb_notify_add_bus(bus);
936
937 dev_info (bus->controller, "new USB bus registered, assigned bus "
938 "number %d\n", bus->busnum);
939 return 0;
940
941error_find_busnum:
942 mutex_unlock(&usb_bus_idr_lock);
943 return result;
944}
945
946/**
947 * usb_deregister_bus - deregisters the USB host controller
948 * @bus: pointer to the bus to deregister
949 *
950 * Context: task context, might sleep.
951 *
952 * Recycles the bus number, and unlinks the controller from usbcore data
953 * structures so that it won't be seen by scanning the bus list.
954 */
955static void usb_deregister_bus (struct usb_bus *bus)
956{
957 dev_info (bus->controller, "USB bus %d deregistered\n", bus->busnum);
958
959 /*
960 * NOTE: make sure that all the devices are removed by the
961 * controller code, as well as having it call this when cleaning
962 * itself up
963 */
964 mutex_lock(&usb_bus_idr_lock);
965 idr_remove(&usb_bus_idr, bus->busnum);
966 mutex_unlock(&usb_bus_idr_lock);
967
968 usb_notify_remove_bus(bus);
969}
970
971/**
972 * register_root_hub - called by usb_add_hcd() to register a root hub
973 * @hcd: host controller for this root hub
974 *
975 * This function registers the root hub with the USB subsystem. It sets up
976 * the device properly in the device tree and then calls usb_new_device()
977 * to register the usb device. It also assigns the root hub's USB address
978 * (always 1).
979 *
980 * Return: 0 if successful. A negative error code otherwise.
981 */
982static int register_root_hub(struct usb_hcd *hcd)
983{
984 struct device *parent_dev = hcd->self.controller;
985 struct usb_device *usb_dev = hcd->self.root_hub;
986 const int devnum = 1;
987 int retval;
988
989 usb_dev->devnum = devnum;
990 usb_dev->bus->devnum_next = devnum + 1;
991 set_bit (devnum, usb_dev->bus->devmap.devicemap);
992 usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
993
994 mutex_lock(&usb_bus_idr_lock);
995
996 usb_dev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
997 retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE);
998 if (retval != sizeof usb_dev->descriptor) {
999 mutex_unlock(&usb_bus_idr_lock);
1000 dev_dbg (parent_dev, "can't read %s device descriptor %d\n",
1001 dev_name(&usb_dev->dev), retval);
1002 return (retval < 0) ? retval : -EMSGSIZE;
1003 }
1004
1005 if (le16_to_cpu(usb_dev->descriptor.bcdUSB) >= 0x0201) {
1006 retval = usb_get_bos_descriptor(usb_dev);
1007 if (!retval) {
1008 usb_dev->lpm_capable = usb_device_supports_lpm(usb_dev);
1009 } else if (usb_dev->speed >= USB_SPEED_SUPER) {
1010 mutex_unlock(&usb_bus_idr_lock);
1011 dev_dbg(parent_dev, "can't read %s bos descriptor %d\n",
1012 dev_name(&usb_dev->dev), retval);
1013 return retval;
1014 }
1015 }
1016
1017 retval = usb_new_device (usb_dev);
1018 if (retval) {
1019 dev_err (parent_dev, "can't register root hub for %s, %d\n",
1020 dev_name(&usb_dev->dev), retval);
1021 } else {
1022 spin_lock_irq (&hcd_root_hub_lock);
1023 hcd->rh_registered = 1;
1024 spin_unlock_irq (&hcd_root_hub_lock);
1025
1026 /* Did the HC die before the root hub was registered? */
1027 if (HCD_DEAD(hcd))
1028 usb_hc_died (hcd); /* This time clean up */
1029 }
1030 mutex_unlock(&usb_bus_idr_lock);
1031
1032 return retval;
1033}
1034
1035/*
1036 * usb_hcd_start_port_resume - a root-hub port is sending a resume signal
1037 * @bus: the bus which the root hub belongs to
1038 * @portnum: the port which is being resumed
1039 *
1040 * HCDs should call this function when they know that a resume signal is
1041 * being sent to a root-hub port. The root hub will be prevented from
1042 * going into autosuspend until usb_hcd_end_port_resume() is called.
1043 *
1044 * The bus's private lock must be held by the caller.
1045 */
1046void usb_hcd_start_port_resume(struct usb_bus *bus, int portnum)
1047{
1048 unsigned bit = 1 << portnum;
1049
1050 if (!(bus->resuming_ports & bit)) {
1051 bus->resuming_ports |= bit;
1052 pm_runtime_get_noresume(&bus->root_hub->dev);
1053 }
1054}
1055EXPORT_SYMBOL_GPL(usb_hcd_start_port_resume);
1056
1057/*
1058 * usb_hcd_end_port_resume - a root-hub port has stopped sending a resume signal
1059 * @bus: the bus which the root hub belongs to
1060 * @portnum: the port which is being resumed
1061 *
1062 * HCDs should call this function when they know that a resume signal has
1063 * stopped being sent to a root-hub port. The root hub will be allowed to
1064 * autosuspend again.
1065 *
1066 * The bus's private lock must be held by the caller.
1067 */
1068void usb_hcd_end_port_resume(struct usb_bus *bus, int portnum)
1069{
1070 unsigned bit = 1 << portnum;
1071
1072 if (bus->resuming_ports & bit) {
1073 bus->resuming_ports &= ~bit;
1074 pm_runtime_put_noidle(&bus->root_hub->dev);
1075 }
1076}
1077EXPORT_SYMBOL_GPL(usb_hcd_end_port_resume);
1078
1079/*-------------------------------------------------------------------------*/
1080
1081/**
1082 * usb_calc_bus_time - approximate periodic transaction time in nanoseconds
1083 * @speed: from dev->speed; USB_SPEED_{LOW,FULL,HIGH}
1084 * @is_input: true iff the transaction sends data to the host
1085 * @isoc: true for isochronous transactions, false for interrupt ones
1086 * @bytecount: how many bytes in the transaction.
1087 *
1088 * Return: Approximate bus time in nanoseconds for a periodic transaction.
1089 *
1090 * Note:
1091 * See USB 2.0 spec section 5.11.3; only periodic transfers need to be
1092 * scheduled in software, this function is only used for such scheduling.
1093 */
1094long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount)
1095{
1096 unsigned long tmp;
1097
1098 switch (speed) {
1099 case USB_SPEED_LOW: /* INTR only */
1100 if (is_input) {
1101 tmp = (67667L * (31L + 10L * BitTime (bytecount))) / 1000L;
1102 return 64060L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp;
1103 } else {
1104 tmp = (66700L * (31L + 10L * BitTime (bytecount))) / 1000L;
1105 return 64107L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp;
1106 }
1107 case USB_SPEED_FULL: /* ISOC or INTR */
1108 if (isoc) {
1109 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
1110 return ((is_input) ? 7268L : 6265L) + BW_HOST_DELAY + tmp;
1111 } else {
1112 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
1113 return 9107L + BW_HOST_DELAY + tmp;
1114 }
1115 case USB_SPEED_HIGH: /* ISOC or INTR */
1116 /* FIXME adjust for input vs output */
1117 if (isoc)
1118 tmp = HS_NSECS_ISO (bytecount);
1119 else
1120 tmp = HS_NSECS (bytecount);
1121 return tmp;
1122 default:
1123 pr_debug ("%s: bogus device speed!\n", usbcore_name);
1124 return -1;
1125 }
1126}
1127EXPORT_SYMBOL_GPL(usb_calc_bus_time);
1128
1129
1130/*-------------------------------------------------------------------------*/
1131
1132/*
1133 * Generic HC operations.
1134 */
1135
1136/*-------------------------------------------------------------------------*/
1137
1138/**
1139 * usb_hcd_link_urb_to_ep - add an URB to its endpoint queue
1140 * @hcd: host controller to which @urb was submitted
1141 * @urb: URB being submitted
1142 *
1143 * Host controller drivers should call this routine in their enqueue()
1144 * method. The HCD's private spinlock must be held and interrupts must
1145 * be disabled. The actions carried out here are required for URB
1146 * submission, as well as for endpoint shutdown and for usb_kill_urb.
1147 *
1148 * Return: 0 for no error, otherwise a negative error code (in which case
1149 * the enqueue() method must fail). If no error occurs but enqueue() fails
1150 * anyway, it must call usb_hcd_unlink_urb_from_ep() before releasing
1151 * the private spinlock and returning.
1152 */
1153int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb)
1154{
1155 int rc = 0;
1156
1157 spin_lock(&hcd_urb_list_lock);
1158
1159 /* Check that the URB isn't being killed */
1160 if (unlikely(atomic_read(&urb->reject))) {
1161 rc = -EPERM;
1162 goto done;
1163 }
1164
1165 if (unlikely(!urb->ep->enabled)) {
1166 rc = -ENOENT;
1167 goto done;
1168 }
1169
1170 if (unlikely(!urb->dev->can_submit)) {
1171 rc = -EHOSTUNREACH;
1172 goto done;
1173 }
1174
1175 /*
1176 * Check the host controller's state and add the URB to the
1177 * endpoint's queue.
1178 */
1179 if (HCD_RH_RUNNING(hcd)) {
1180 urb->unlinked = 0;
1181 list_add_tail(&urb->urb_list, &urb->ep->urb_list);
1182 } else {
1183 rc = -ESHUTDOWN;
1184 goto done;
1185 }
1186 done:
1187 spin_unlock(&hcd_urb_list_lock);
1188 return rc;
1189}
1190EXPORT_SYMBOL_GPL(usb_hcd_link_urb_to_ep);
1191
1192/**
1193 * usb_hcd_check_unlink_urb - check whether an URB may be unlinked
1194 * @hcd: host controller to which @urb was submitted
1195 * @urb: URB being checked for unlinkability
1196 * @status: error code to store in @urb if the unlink succeeds
1197 *
1198 * Host controller drivers should call this routine in their dequeue()
1199 * method. The HCD's private spinlock must be held and interrupts must
1200 * be disabled. The actions carried out here are required for making
1201 * sure than an unlink is valid.
1202 *
1203 * Return: 0 for no error, otherwise a negative error code (in which case
1204 * the dequeue() method must fail). The possible error codes are:
1205 *
1206 * -EIDRM: @urb was not submitted or has already completed.
1207 * The completion function may not have been called yet.
1208 *
1209 * -EBUSY: @urb has already been unlinked.
1210 */
1211int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
1212 int status)
1213{
1214 struct list_head *tmp;
1215
1216 /* insist the urb is still queued */
1217 list_for_each(tmp, &urb->ep->urb_list) {
1218 if (tmp == &urb->urb_list)
1219 break;
1220 }
1221 if (tmp != &urb->urb_list)
1222 return -EIDRM;
1223
1224 /* Any status except -EINPROGRESS means something already started to
1225 * unlink this URB from the hardware. So there's no more work to do.
1226 */
1227 if (urb->unlinked)
1228 return -EBUSY;
1229 urb->unlinked = status;
1230 return 0;
1231}
1232EXPORT_SYMBOL_GPL(usb_hcd_check_unlink_urb);
1233
1234/**
1235 * usb_hcd_unlink_urb_from_ep - remove an URB from its endpoint queue
1236 * @hcd: host controller to which @urb was submitted
1237 * @urb: URB being unlinked
1238 *
1239 * Host controller drivers should call this routine before calling
1240 * usb_hcd_giveback_urb(). The HCD's private spinlock must be held and
1241 * interrupts must be disabled. The actions carried out here are required
1242 * for URB completion.
1243 */
1244void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb)
1245{
1246 /* clear all state linking urb to this dev (and hcd) */
1247 spin_lock(&hcd_urb_list_lock);
1248 list_del_init(&urb->urb_list);
1249 spin_unlock(&hcd_urb_list_lock);
1250}
1251EXPORT_SYMBOL_GPL(usb_hcd_unlink_urb_from_ep);
1252
1253/*
1254 * Some usb host controllers can only perform dma using a small SRAM area,
1255 * or have restrictions on addressable DRAM.
1256 * The usb core itself is however optimized for host controllers that can dma
1257 * using regular system memory - like pci devices doing bus mastering.
1258 *
1259 * To support host controllers with limited dma capabilities we provide dma
1260 * bounce buffers. This feature can be enabled by initializing
1261 * hcd->localmem_pool using usb_hcd_setup_local_mem().
1262 *
1263 * The initialized hcd->localmem_pool then tells the usb code to allocate all
1264 * data for dma using the genalloc API.
1265 *
1266 * So, to summarize...
1267 *
1268 * - We need "local" memory, canonical example being
1269 * a small SRAM on a discrete controller being the
1270 * only memory that the controller can read ...
1271 * (a) "normal" kernel memory is no good, and
1272 * (b) there's not enough to share
1273 *
1274 * - So we use that, even though the primary requirement
1275 * is that the memory be "local" (hence addressable
1276 * by that device), not "coherent".
1277 *
1278 */
1279
1280static int hcd_alloc_coherent(struct usb_bus *bus,
1281 gfp_t mem_flags, dma_addr_t *dma_handle,
1282 void **vaddr_handle, size_t size,
1283 enum dma_data_direction dir)
1284{
1285 unsigned char *vaddr;
1286
1287 if (*vaddr_handle == NULL) {
1288 WARN_ON_ONCE(1);
1289 return -EFAULT;
1290 }
1291
1292 vaddr = hcd_buffer_alloc(bus, size + sizeof(unsigned long),
1293 mem_flags, dma_handle);
1294 if (!vaddr)
1295 return -ENOMEM;
1296
1297 /*
1298 * Store the virtual address of the buffer at the end
1299 * of the allocated dma buffer. The size of the buffer
1300 * may be uneven so use unaligned functions instead
1301 * of just rounding up. It makes sense to optimize for
1302 * memory footprint over access speed since the amount
1303 * of memory available for dma may be limited.
1304 */
1305 put_unaligned((unsigned long)*vaddr_handle,
1306 (unsigned long *)(vaddr + size));
1307
1308 if (dir == DMA_TO_DEVICE)
1309 memcpy(vaddr, *vaddr_handle, size);
1310
1311 *vaddr_handle = vaddr;
1312 return 0;
1313}
1314
1315static void hcd_free_coherent(struct usb_bus *bus, dma_addr_t *dma_handle,
1316 void **vaddr_handle, size_t size,
1317 enum dma_data_direction dir)
1318{
1319 unsigned char *vaddr = *vaddr_handle;
1320
1321 vaddr = (void *)get_unaligned((unsigned long *)(vaddr + size));
1322
1323 if (dir == DMA_FROM_DEVICE)
1324 memcpy(vaddr, *vaddr_handle, size);
1325
1326 hcd_buffer_free(bus, size + sizeof(vaddr), *vaddr_handle, *dma_handle);
1327
1328 *vaddr_handle = vaddr;
1329 *dma_handle = 0;
1330}
1331
1332void usb_hcd_unmap_urb_setup_for_dma(struct usb_hcd *hcd, struct urb *urb)
1333{
1334 if (IS_ENABLED(CONFIG_HAS_DMA) &&
1335 (urb->transfer_flags & URB_SETUP_MAP_SINGLE))
1336 dma_unmap_single(hcd->self.sysdev,
1337 urb->setup_dma,
1338 sizeof(struct usb_ctrlrequest),
1339 DMA_TO_DEVICE);
1340 else if (urb->transfer_flags & URB_SETUP_MAP_LOCAL)
1341 hcd_free_coherent(urb->dev->bus,
1342 &urb->setup_dma,
1343 (void **) &urb->setup_packet,
1344 sizeof(struct usb_ctrlrequest),
1345 DMA_TO_DEVICE);
1346
1347 /* Make it safe to call this routine more than once */
1348 urb->transfer_flags &= ~(URB_SETUP_MAP_SINGLE | URB_SETUP_MAP_LOCAL);
1349}
1350EXPORT_SYMBOL_GPL(usb_hcd_unmap_urb_setup_for_dma);
1351
1352static void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
1353{
1354 if (hcd->driver->unmap_urb_for_dma)
1355 hcd->driver->unmap_urb_for_dma(hcd, urb);
1356 else
1357 usb_hcd_unmap_urb_for_dma(hcd, urb);
1358}
1359
1360void usb_hcd_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
1361{
1362 enum dma_data_direction dir;
1363
1364 usb_hcd_unmap_urb_setup_for_dma(hcd, urb);
1365
1366 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
1367 if (IS_ENABLED(CONFIG_HAS_DMA) &&
1368 (urb->transfer_flags & URB_DMA_MAP_SG))
1369 dma_unmap_sg(hcd->self.sysdev,
1370 urb->sg,
1371 urb->num_sgs,
1372 dir);
1373 else if (IS_ENABLED(CONFIG_HAS_DMA) &&
1374 (urb->transfer_flags & URB_DMA_MAP_PAGE))
1375 dma_unmap_page(hcd->self.sysdev,
1376 urb->transfer_dma,
1377 urb->transfer_buffer_length,
1378 dir);
1379 else if (IS_ENABLED(CONFIG_HAS_DMA) &&
1380 (urb->transfer_flags & URB_DMA_MAP_SINGLE))
1381 dma_unmap_single(hcd->self.sysdev,
1382 urb->transfer_dma,
1383 urb->transfer_buffer_length,
1384 dir);
1385 else if (urb->transfer_flags & URB_MAP_LOCAL)
1386 hcd_free_coherent(urb->dev->bus,
1387 &urb->transfer_dma,
1388 &urb->transfer_buffer,
1389 urb->transfer_buffer_length,
1390 dir);
1391
1392 /* Make it safe to call this routine more than once */
1393 urb->transfer_flags &= ~(URB_DMA_MAP_SG | URB_DMA_MAP_PAGE |
1394 URB_DMA_MAP_SINGLE | URB_MAP_LOCAL);
1395}
1396EXPORT_SYMBOL_GPL(usb_hcd_unmap_urb_for_dma);
1397
1398static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
1399 gfp_t mem_flags)
1400{
1401 if (hcd->driver->map_urb_for_dma)
1402 return hcd->driver->map_urb_for_dma(hcd, urb, mem_flags);
1403 else
1404 return usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
1405}
1406
1407int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
1408 gfp_t mem_flags)
1409{
1410 enum dma_data_direction dir;
1411 int ret = 0;
1412
1413 /* Map the URB's buffers for DMA access.
1414 * Lower level HCD code should use *_dma exclusively,
1415 * unless it uses pio or talks to another transport,
1416 * or uses the provided scatter gather list for bulk.
1417 */
1418
1419 if (usb_endpoint_xfer_control(&urb->ep->desc)) {
1420 if (hcd->self.uses_pio_for_control)
1421 return ret;
1422 if (hcd->localmem_pool) {
1423 ret = hcd_alloc_coherent(
1424 urb->dev->bus, mem_flags,
1425 &urb->setup_dma,
1426 (void **)&urb->setup_packet,
1427 sizeof(struct usb_ctrlrequest),
1428 DMA_TO_DEVICE);
1429 if (ret)
1430 return ret;
1431 urb->transfer_flags |= URB_SETUP_MAP_LOCAL;
1432 } else if (hcd_uses_dma(hcd)) {
1433 if (object_is_on_stack(urb->setup_packet)) {
1434 WARN_ONCE(1, "setup packet is on stack\n");
1435 return -EAGAIN;
1436 }
1437
1438 urb->setup_dma = dma_map_single(
1439 hcd->self.sysdev,
1440 urb->setup_packet,
1441 sizeof(struct usb_ctrlrequest),
1442 DMA_TO_DEVICE);
1443 if (dma_mapping_error(hcd->self.sysdev,
1444 urb->setup_dma))
1445 return -EAGAIN;
1446 urb->transfer_flags |= URB_SETUP_MAP_SINGLE;
1447 }
1448 }
1449
1450 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
1451 if (urb->transfer_buffer_length != 0
1452 && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) {
1453 if (hcd->localmem_pool) {
1454 ret = hcd_alloc_coherent(
1455 urb->dev->bus, mem_flags,
1456 &urb->transfer_dma,
1457 &urb->transfer_buffer,
1458 urb->transfer_buffer_length,
1459 dir);
1460 if (ret == 0)
1461 urb->transfer_flags |= URB_MAP_LOCAL;
1462 } else if (hcd_uses_dma(hcd)) {
1463 if (urb->num_sgs) {
1464 int n;
1465
1466 /* We don't support sg for isoc transfers ! */
1467 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1468 WARN_ON(1);
1469 return -EINVAL;
1470 }
1471
1472 n = dma_map_sg(
1473 hcd->self.sysdev,
1474 urb->sg,
1475 urb->num_sgs,
1476 dir);
1477 if (!n)
1478 ret = -EAGAIN;
1479 else
1480 urb->transfer_flags |= URB_DMA_MAP_SG;
1481 urb->num_mapped_sgs = n;
1482 if (n != urb->num_sgs)
1483 urb->transfer_flags |=
1484 URB_DMA_SG_COMBINED;
1485 } else if (urb->sg) {
1486 struct scatterlist *sg = urb->sg;
1487 urb->transfer_dma = dma_map_page(
1488 hcd->self.sysdev,
1489 sg_page(sg),
1490 sg->offset,
1491 urb->transfer_buffer_length,
1492 dir);
1493 if (dma_mapping_error(hcd->self.sysdev,
1494 urb->transfer_dma))
1495 ret = -EAGAIN;
1496 else
1497 urb->transfer_flags |= URB_DMA_MAP_PAGE;
1498 } else if (object_is_on_stack(urb->transfer_buffer)) {
1499 WARN_ONCE(1, "transfer buffer is on stack\n");
1500 ret = -EAGAIN;
1501 } else {
1502 urb->transfer_dma = dma_map_single(
1503 hcd->self.sysdev,
1504 urb->transfer_buffer,
1505 urb->transfer_buffer_length,
1506 dir);
1507 if (dma_mapping_error(hcd->self.sysdev,
1508 urb->transfer_dma))
1509 ret = -EAGAIN;
1510 else
1511 urb->transfer_flags |= URB_DMA_MAP_SINGLE;
1512 }
1513 }
1514 if (ret && (urb->transfer_flags & (URB_SETUP_MAP_SINGLE |
1515 URB_SETUP_MAP_LOCAL)))
1516 usb_hcd_unmap_urb_for_dma(hcd, urb);
1517 }
1518 return ret;
1519}
1520EXPORT_SYMBOL_GPL(usb_hcd_map_urb_for_dma);
1521
1522/*-------------------------------------------------------------------------*/
1523
1524/* may be called in any context with a valid urb->dev usecount
1525 * caller surrenders "ownership" of urb
1526 * expects usb_submit_urb() to have sanity checked and conditioned all
1527 * inputs in the urb
1528 */
1529int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
1530{
1531 int status;
1532 struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus);
1533
1534 /* increment urb's reference count as part of giving it to the HCD
1535 * (which will control it). HCD guarantees that it either returns
1536 * an error or calls giveback(), but not both.
1537 */
1538 usb_get_urb(urb);
1539 atomic_inc(&urb->use_count);
1540 atomic_inc(&urb->dev->urbnum);
1541 usbmon_urb_submit(&hcd->self, urb);
1542
1543 /* NOTE requirements on root-hub callers (usbfs and the hub
1544 * driver, for now): URBs' urb->transfer_buffer must be
1545 * valid and usb_buffer_{sync,unmap}() not be needed, since
1546 * they could clobber root hub response data. Also, control
1547 * URBs must be submitted in process context with interrupts
1548 * enabled.
1549 */
1550
1551 if (is_root_hub(urb->dev)) {
1552 status = rh_urb_enqueue(hcd, urb);
1553 } else {
1554 status = map_urb_for_dma(hcd, urb, mem_flags);
1555 if (likely(status == 0)) {
1556 status = hcd->driver->urb_enqueue(hcd, urb, mem_flags);
1557 if (unlikely(status))
1558 unmap_urb_for_dma(hcd, urb);
1559 }
1560 }
1561
1562 if (unlikely(status)) {
1563 usbmon_urb_submit_error(&hcd->self, urb, status);
1564 urb->hcpriv = NULL;
1565 INIT_LIST_HEAD(&urb->urb_list);
1566 atomic_dec(&urb->use_count);
1567 /*
1568 * Order the write of urb->use_count above before the read
1569 * of urb->reject below. Pairs with the memory barriers in
1570 * usb_kill_urb() and usb_poison_urb().
1571 */
1572 smp_mb__after_atomic();
1573
1574 atomic_dec(&urb->dev->urbnum);
1575 if (atomic_read(&urb->reject))
1576 wake_up(&usb_kill_urb_queue);
1577 usb_put_urb(urb);
1578 }
1579 return status;
1580}
1581
1582/*-------------------------------------------------------------------------*/
1583
1584/* this makes the hcd giveback() the urb more quickly, by kicking it
1585 * off hardware queues (which may take a while) and returning it as
1586 * soon as practical. we've already set up the urb's return status,
1587 * but we can't know if the callback completed already.
1588 */
1589static int unlink1(struct usb_hcd *hcd, struct urb *urb, int status)
1590{
1591 int value;
1592
1593 if (is_root_hub(urb->dev))
1594 value = usb_rh_urb_dequeue(hcd, urb, status);
1595 else {
1596
1597 /* The only reason an HCD might fail this call is if
1598 * it has not yet fully queued the urb to begin with.
1599 * Such failures should be harmless. */
1600 value = hcd->driver->urb_dequeue(hcd, urb, status);
1601 }
1602 return value;
1603}
1604
1605/*
1606 * called in any context
1607 *
1608 * caller guarantees urb won't be recycled till both unlink()
1609 * and the urb's completion function return
1610 */
1611int usb_hcd_unlink_urb (struct urb *urb, int status)
1612{
1613 struct usb_hcd *hcd;
1614 struct usb_device *udev = urb->dev;
1615 int retval = -EIDRM;
1616 unsigned long flags;
1617
1618 /* Prevent the device and bus from going away while
1619 * the unlink is carried out. If they are already gone
1620 * then urb->use_count must be 0, since disconnected
1621 * devices can't have any active URBs.
1622 */
1623 spin_lock_irqsave(&hcd_urb_unlink_lock, flags);
1624 if (atomic_read(&urb->use_count) > 0) {
1625 retval = 0;
1626 usb_get_dev(udev);
1627 }
1628 spin_unlock_irqrestore(&hcd_urb_unlink_lock, flags);
1629 if (retval == 0) {
1630 hcd = bus_to_hcd(urb->dev->bus);
1631 retval = unlink1(hcd, urb, status);
1632 if (retval == 0)
1633 retval = -EINPROGRESS;
1634 else if (retval != -EIDRM && retval != -EBUSY)
1635 dev_dbg(&udev->dev, "hcd_unlink_urb %pK fail %d\n",
1636 urb, retval);
1637 usb_put_dev(udev);
1638 }
1639 return retval;
1640}
1641
1642/*-------------------------------------------------------------------------*/
1643
1644static void __usb_hcd_giveback_urb(struct urb *urb)
1645{
1646 struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus);
1647 struct usb_anchor *anchor = urb->anchor;
1648 int status = urb->unlinked;
1649
1650 urb->hcpriv = NULL;
1651 if (unlikely((urb->transfer_flags & URB_SHORT_NOT_OK) &&
1652 urb->actual_length < urb->transfer_buffer_length &&
1653 !status))
1654 status = -EREMOTEIO;
1655
1656 unmap_urb_for_dma(hcd, urb);
1657 usbmon_urb_complete(&hcd->self, urb, status);
1658 usb_anchor_suspend_wakeups(anchor);
1659 usb_unanchor_urb(urb);
1660 if (likely(status == 0))
1661 usb_led_activity(USB_LED_EVENT_HOST);
1662
1663 /* pass ownership to the completion handler */
1664 urb->status = status;
1665 /*
1666 * This function can be called in task context inside another remote
1667 * coverage collection section, but kcov doesn't support that kind of
1668 * recursion yet. Only collect coverage in softirq context for now.
1669 */
1670 kcov_remote_start_usb_softirq((u64)urb->dev->bus->busnum);
1671 urb->complete(urb);
1672 kcov_remote_stop_softirq();
1673
1674 usb_anchor_resume_wakeups(anchor);
1675 atomic_dec(&urb->use_count);
1676 /*
1677 * Order the write of urb->use_count above before the read
1678 * of urb->reject below. Pairs with the memory barriers in
1679 * usb_kill_urb() and usb_poison_urb().
1680 */
1681 smp_mb__after_atomic();
1682
1683 if (unlikely(atomic_read(&urb->reject)))
1684 wake_up(&usb_kill_urb_queue);
1685 usb_put_urb(urb);
1686}
1687
1688static void usb_giveback_urb_bh(struct tasklet_struct *t)
1689{
1690 struct giveback_urb_bh *bh = from_tasklet(bh, t, bh);
1691 struct list_head local_list;
1692
1693 spin_lock_irq(&bh->lock);
1694 bh->running = true;
1695 list_replace_init(&bh->head, &local_list);
1696 spin_unlock_irq(&bh->lock);
1697
1698 while (!list_empty(&local_list)) {
1699 struct urb *urb;
1700
1701 urb = list_entry(local_list.next, struct urb, urb_list);
1702 list_del_init(&urb->urb_list);
1703 bh->completing_ep = urb->ep;
1704 __usb_hcd_giveback_urb(urb);
1705 bh->completing_ep = NULL;
1706 }
1707
1708 /*
1709 * giveback new URBs next time to prevent this function
1710 * from not exiting for a long time.
1711 */
1712 spin_lock_irq(&bh->lock);
1713 if (!list_empty(&bh->head)) {
1714 if (bh->high_prio)
1715 tasklet_hi_schedule(&bh->bh);
1716 else
1717 tasklet_schedule(&bh->bh);
1718 }
1719 bh->running = false;
1720 spin_unlock_irq(&bh->lock);
1721}
1722
1723/**
1724 * usb_hcd_giveback_urb - return URB from HCD to device driver
1725 * @hcd: host controller returning the URB
1726 * @urb: urb being returned to the USB device driver.
1727 * @status: completion status code for the URB.
1728 *
1729 * Context: atomic. The completion callback is invoked in caller's context.
1730 * For HCDs with HCD_BH flag set, the completion callback is invoked in tasklet
1731 * context (except for URBs submitted to the root hub which always complete in
1732 * caller's context).
1733 *
1734 * This hands the URB from HCD to its USB device driver, using its
1735 * completion function. The HCD has freed all per-urb resources
1736 * (and is done using urb->hcpriv). It also released all HCD locks;
1737 * the device driver won't cause problems if it frees, modifies,
1738 * or resubmits this URB.
1739 *
1740 * If @urb was unlinked, the value of @status will be overridden by
1741 * @urb->unlinked. Erroneous short transfers are detected in case
1742 * the HCD hasn't checked for them.
1743 */
1744void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb, int status)
1745{
1746 struct giveback_urb_bh *bh;
1747 bool running;
1748
1749 /* pass status to tasklet via unlinked */
1750 if (likely(!urb->unlinked))
1751 urb->unlinked = status;
1752
1753 if (!hcd_giveback_urb_in_bh(hcd) && !is_root_hub(urb->dev)) {
1754 __usb_hcd_giveback_urb(urb);
1755 return;
1756 }
1757
1758 if (usb_pipeisoc(urb->pipe) || usb_pipeint(urb->pipe))
1759 bh = &hcd->high_prio_bh;
1760 else
1761 bh = &hcd->low_prio_bh;
1762
1763 spin_lock(&bh->lock);
1764 list_add_tail(&urb->urb_list, &bh->head);
1765 running = bh->running;
1766 spin_unlock(&bh->lock);
1767
1768 if (running)
1769 ;
1770 else if (bh->high_prio)
1771 tasklet_hi_schedule(&bh->bh);
1772 else
1773 tasklet_schedule(&bh->bh);
1774}
1775EXPORT_SYMBOL_GPL(usb_hcd_giveback_urb);
1776
1777/*-------------------------------------------------------------------------*/
1778
1779/* Cancel all URBs pending on this endpoint and wait for the endpoint's
1780 * queue to drain completely. The caller must first insure that no more
1781 * URBs can be submitted for this endpoint.
1782 */
1783void usb_hcd_flush_endpoint(struct usb_device *udev,
1784 struct usb_host_endpoint *ep)
1785{
1786 struct usb_hcd *hcd;
1787 struct urb *urb;
1788
1789 if (!ep)
1790 return;
1791 might_sleep();
1792 hcd = bus_to_hcd(udev->bus);
1793
1794 /* No more submits can occur */
1795 spin_lock_irq(&hcd_urb_list_lock);
1796rescan:
1797 list_for_each_entry_reverse(urb, &ep->urb_list, urb_list) {
1798 int is_in;
1799
1800 if (urb->unlinked)
1801 continue;
1802 usb_get_urb (urb);
1803 is_in = usb_urb_dir_in(urb);
1804 spin_unlock(&hcd_urb_list_lock);
1805
1806 /* kick hcd */
1807 unlink1(hcd, urb, -ESHUTDOWN);
1808 dev_dbg (hcd->self.controller,
1809 "shutdown urb %pK ep%d%s-%s\n",
1810 urb, usb_endpoint_num(&ep->desc),
1811 is_in ? "in" : "out",
1812 usb_ep_type_string(usb_endpoint_type(&ep->desc)));
1813 usb_put_urb (urb);
1814
1815 /* list contents may have changed */
1816 spin_lock(&hcd_urb_list_lock);
1817 goto rescan;
1818 }
1819 spin_unlock_irq(&hcd_urb_list_lock);
1820
1821 /* Wait until the endpoint queue is completely empty */
1822 while (!list_empty (&ep->urb_list)) {
1823 spin_lock_irq(&hcd_urb_list_lock);
1824
1825 /* The list may have changed while we acquired the spinlock */
1826 urb = NULL;
1827 if (!list_empty (&ep->urb_list)) {
1828 urb = list_entry (ep->urb_list.prev, struct urb,
1829 urb_list);
1830 usb_get_urb (urb);
1831 }
1832 spin_unlock_irq(&hcd_urb_list_lock);
1833
1834 if (urb) {
1835 usb_kill_urb (urb);
1836 usb_put_urb (urb);
1837 }
1838 }
1839}
1840
1841/**
1842 * usb_hcd_alloc_bandwidth - check whether a new bandwidth setting exceeds
1843 * the bus bandwidth
1844 * @udev: target &usb_device
1845 * @new_config: new configuration to install
1846 * @cur_alt: the current alternate interface setting
1847 * @new_alt: alternate interface setting that is being installed
1848 *
1849 * To change configurations, pass in the new configuration in new_config,
1850 * and pass NULL for cur_alt and new_alt.
1851 *
1852 * To reset a device's configuration (put the device in the ADDRESSED state),
1853 * pass in NULL for new_config, cur_alt, and new_alt.
1854 *
1855 * To change alternate interface settings, pass in NULL for new_config,
1856 * pass in the current alternate interface setting in cur_alt,
1857 * and pass in the new alternate interface setting in new_alt.
1858 *
1859 * Return: An error if the requested bandwidth change exceeds the
1860 * bus bandwidth or host controller internal resources.
1861 */
1862int usb_hcd_alloc_bandwidth(struct usb_device *udev,
1863 struct usb_host_config *new_config,
1864 struct usb_host_interface *cur_alt,
1865 struct usb_host_interface *new_alt)
1866{
1867 int num_intfs, i, j;
1868 struct usb_host_interface *alt = NULL;
1869 int ret = 0;
1870 struct usb_hcd *hcd;
1871 struct usb_host_endpoint *ep;
1872
1873 hcd = bus_to_hcd(udev->bus);
1874 if (!hcd->driver->check_bandwidth)
1875 return 0;
1876
1877 /* Configuration is being removed - set configuration 0 */
1878 if (!new_config && !cur_alt) {
1879 for (i = 1; i < 16; ++i) {
1880 ep = udev->ep_out[i];
1881 if (ep)
1882 hcd->driver->drop_endpoint(hcd, udev, ep);
1883 ep = udev->ep_in[i];
1884 if (ep)
1885 hcd->driver->drop_endpoint(hcd, udev, ep);
1886 }
1887 hcd->driver->check_bandwidth(hcd, udev);
1888 return 0;
1889 }
1890 /* Check if the HCD says there's enough bandwidth. Enable all endpoints
1891 * each interface's alt setting 0 and ask the HCD to check the bandwidth
1892 * of the bus. There will always be bandwidth for endpoint 0, so it's
1893 * ok to exclude it.
1894 */
1895 if (new_config) {
1896 num_intfs = new_config->desc.bNumInterfaces;
1897 /* Remove endpoints (except endpoint 0, which is always on the
1898 * schedule) from the old config from the schedule
1899 */
1900 for (i = 1; i < 16; ++i) {
1901 ep = udev->ep_out[i];
1902 if (ep) {
1903 ret = hcd->driver->drop_endpoint(hcd, udev, ep);
1904 if (ret < 0)
1905 goto reset;
1906 }
1907 ep = udev->ep_in[i];
1908 if (ep) {
1909 ret = hcd->driver->drop_endpoint(hcd, udev, ep);
1910 if (ret < 0)
1911 goto reset;
1912 }
1913 }
1914 for (i = 0; i < num_intfs; ++i) {
1915 struct usb_host_interface *first_alt;
1916 int iface_num;
1917
1918 first_alt = &new_config->intf_cache[i]->altsetting[0];
1919 iface_num = first_alt->desc.bInterfaceNumber;
1920 /* Set up endpoints for alternate interface setting 0 */
1921 alt = usb_find_alt_setting(new_config, iface_num, 0);
1922 if (!alt)
1923 /* No alt setting 0? Pick the first setting. */
1924 alt = first_alt;
1925
1926 for (j = 0; j < alt->desc.bNumEndpoints; j++) {
1927 ret = hcd->driver->add_endpoint(hcd, udev, &alt->endpoint[j]);
1928 if (ret < 0)
1929 goto reset;
1930 }
1931 }
1932 }
1933 if (cur_alt && new_alt) {
1934 struct usb_interface *iface = usb_ifnum_to_if(udev,
1935 cur_alt->desc.bInterfaceNumber);
1936
1937 if (!iface)
1938 return -EINVAL;
1939 if (iface->resetting_device) {
1940 /*
1941 * The USB core just reset the device, so the xHCI host
1942 * and the device will think alt setting 0 is installed.
1943 * However, the USB core will pass in the alternate
1944 * setting installed before the reset as cur_alt. Dig
1945 * out the alternate setting 0 structure, or the first
1946 * alternate setting if a broken device doesn't have alt
1947 * setting 0.
1948 */
1949 cur_alt = usb_altnum_to_altsetting(iface, 0);
1950 if (!cur_alt)
1951 cur_alt = &iface->altsetting[0];
1952 }
1953
1954 /* Drop all the endpoints in the current alt setting */
1955 for (i = 0; i < cur_alt->desc.bNumEndpoints; i++) {
1956 ret = hcd->driver->drop_endpoint(hcd, udev,
1957 &cur_alt->endpoint[i]);
1958 if (ret < 0)
1959 goto reset;
1960 }
1961 /* Add all the endpoints in the new alt setting */
1962 for (i = 0; i < new_alt->desc.bNumEndpoints; i++) {
1963 ret = hcd->driver->add_endpoint(hcd, udev,
1964 &new_alt->endpoint[i]);
1965 if (ret < 0)
1966 goto reset;
1967 }
1968 }
1969 ret = hcd->driver->check_bandwidth(hcd, udev);
1970reset:
1971 if (ret < 0)
1972 hcd->driver->reset_bandwidth(hcd, udev);
1973 return ret;
1974}
1975
1976/* Disables the endpoint: synchronizes with the hcd to make sure all
1977 * endpoint state is gone from hardware. usb_hcd_flush_endpoint() must
1978 * have been called previously. Use for set_configuration, set_interface,
1979 * driver removal, physical disconnect.
1980 *
1981 * example: a qh stored in ep->hcpriv, holding state related to endpoint
1982 * type, maxpacket size, toggle, halt status, and scheduling.
1983 */
1984void usb_hcd_disable_endpoint(struct usb_device *udev,
1985 struct usb_host_endpoint *ep)
1986{
1987 struct usb_hcd *hcd;
1988
1989 might_sleep();
1990 hcd = bus_to_hcd(udev->bus);
1991 if (hcd->driver->endpoint_disable)
1992 hcd->driver->endpoint_disable(hcd, ep);
1993}
1994
1995/**
1996 * usb_hcd_reset_endpoint - reset host endpoint state
1997 * @udev: USB device.
1998 * @ep: the endpoint to reset.
1999 *
2000 * Resets any host endpoint state such as the toggle bit, sequence
2001 * number and current window.
2002 */
2003void usb_hcd_reset_endpoint(struct usb_device *udev,
2004 struct usb_host_endpoint *ep)
2005{
2006 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2007
2008 if (hcd->driver->endpoint_reset)
2009 hcd->driver->endpoint_reset(hcd, ep);
2010 else {
2011 int epnum = usb_endpoint_num(&ep->desc);
2012 int is_out = usb_endpoint_dir_out(&ep->desc);
2013 int is_control = usb_endpoint_xfer_control(&ep->desc);
2014
2015 usb_settoggle(udev, epnum, is_out, 0);
2016 if (is_control)
2017 usb_settoggle(udev, epnum, !is_out, 0);
2018 }
2019}
2020
2021/**
2022 * usb_alloc_streams - allocate bulk endpoint stream IDs.
2023 * @interface: alternate setting that includes all endpoints.
2024 * @eps: array of endpoints that need streams.
2025 * @num_eps: number of endpoints in the array.
2026 * @num_streams: number of streams to allocate.
2027 * @mem_flags: flags hcd should use to allocate memory.
2028 *
2029 * Sets up a group of bulk endpoints to have @num_streams stream IDs available.
2030 * Drivers may queue multiple transfers to different stream IDs, which may
2031 * complete in a different order than they were queued.
2032 *
2033 * Return: On success, the number of allocated streams. On failure, a negative
2034 * error code.
2035 */
2036int usb_alloc_streams(struct usb_interface *interface,
2037 struct usb_host_endpoint **eps, unsigned int num_eps,
2038 unsigned int num_streams, gfp_t mem_flags)
2039{
2040 struct usb_hcd *hcd;
2041 struct usb_device *dev;
2042 int i, ret;
2043
2044 dev = interface_to_usbdev(interface);
2045 hcd = bus_to_hcd(dev->bus);
2046 if (!hcd->driver->alloc_streams || !hcd->driver->free_streams)
2047 return -EINVAL;
2048 if (dev->speed < USB_SPEED_SUPER)
2049 return -EINVAL;
2050 if (dev->state < USB_STATE_CONFIGURED)
2051 return -ENODEV;
2052
2053 for (i = 0; i < num_eps; i++) {
2054 /* Streams only apply to bulk endpoints. */
2055 if (!usb_endpoint_xfer_bulk(&eps[i]->desc))
2056 return -EINVAL;
2057 /* Re-alloc is not allowed */
2058 if (eps[i]->streams)
2059 return -EINVAL;
2060 }
2061
2062 ret = hcd->driver->alloc_streams(hcd, dev, eps, num_eps,
2063 num_streams, mem_flags);
2064 if (ret < 0)
2065 return ret;
2066
2067 for (i = 0; i < num_eps; i++)
2068 eps[i]->streams = ret;
2069
2070 return ret;
2071}
2072EXPORT_SYMBOL_GPL(usb_alloc_streams);
2073
2074/**
2075 * usb_free_streams - free bulk endpoint stream IDs.
2076 * @interface: alternate setting that includes all endpoints.
2077 * @eps: array of endpoints to remove streams from.
2078 * @num_eps: number of endpoints in the array.
2079 * @mem_flags: flags hcd should use to allocate memory.
2080 *
2081 * Reverts a group of bulk endpoints back to not using stream IDs.
2082 * Can fail if we are given bad arguments, or HCD is broken.
2083 *
2084 * Return: 0 on success. On failure, a negative error code.
2085 */
2086int usb_free_streams(struct usb_interface *interface,
2087 struct usb_host_endpoint **eps, unsigned int num_eps,
2088 gfp_t mem_flags)
2089{
2090 struct usb_hcd *hcd;
2091 struct usb_device *dev;
2092 int i, ret;
2093
2094 dev = interface_to_usbdev(interface);
2095 hcd = bus_to_hcd(dev->bus);
2096 if (dev->speed < USB_SPEED_SUPER)
2097 return -EINVAL;
2098
2099 /* Double-free is not allowed */
2100 for (i = 0; i < num_eps; i++)
2101 if (!eps[i] || !eps[i]->streams)
2102 return -EINVAL;
2103
2104 ret = hcd->driver->free_streams(hcd, dev, eps, num_eps, mem_flags);
2105 if (ret < 0)
2106 return ret;
2107
2108 for (i = 0; i < num_eps; i++)
2109 eps[i]->streams = 0;
2110
2111 return ret;
2112}
2113EXPORT_SYMBOL_GPL(usb_free_streams);
2114
2115/* Protect against drivers that try to unlink URBs after the device
2116 * is gone, by waiting until all unlinks for @udev are finished.
2117 * Since we don't currently track URBs by device, simply wait until
2118 * nothing is running in the locked region of usb_hcd_unlink_urb().
2119 */
2120void usb_hcd_synchronize_unlinks(struct usb_device *udev)
2121{
2122 spin_lock_irq(&hcd_urb_unlink_lock);
2123 spin_unlock_irq(&hcd_urb_unlink_lock);
2124}
2125
2126/*-------------------------------------------------------------------------*/
2127
2128/* called in any context */
2129int usb_hcd_get_frame_number (struct usb_device *udev)
2130{
2131 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2132
2133 if (!HCD_RH_RUNNING(hcd))
2134 return -ESHUTDOWN;
2135 return hcd->driver->get_frame_number (hcd);
2136}
2137
2138/*-------------------------------------------------------------------------*/
2139#ifdef CONFIG_USB_HCD_TEST_MODE
2140
2141static void usb_ehset_completion(struct urb *urb)
2142{
2143 struct completion *done = urb->context;
2144
2145 complete(done);
2146}
2147/*
2148 * Allocate and initialize a control URB. This request will be used by the
2149 * EHSET SINGLE_STEP_SET_FEATURE test in which the DATA and STATUS stages
2150 * of the GetDescriptor request are sent 15 seconds after the SETUP stage.
2151 * Return NULL if failed.
2152 */
2153static struct urb *request_single_step_set_feature_urb(
2154 struct usb_device *udev,
2155 void *dr,
2156 void *buf,
2157 struct completion *done)
2158{
2159 struct urb *urb;
2160 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2161
2162 urb = usb_alloc_urb(0, GFP_KERNEL);
2163 if (!urb)
2164 return NULL;
2165
2166 urb->pipe = usb_rcvctrlpipe(udev, 0);
2167
2168 urb->ep = &udev->ep0;
2169 urb->dev = udev;
2170 urb->setup_packet = (void *)dr;
2171 urb->transfer_buffer = buf;
2172 urb->transfer_buffer_length = USB_DT_DEVICE_SIZE;
2173 urb->complete = usb_ehset_completion;
2174 urb->status = -EINPROGRESS;
2175 urb->actual_length = 0;
2176 urb->transfer_flags = URB_DIR_IN;
2177 usb_get_urb(urb);
2178 atomic_inc(&urb->use_count);
2179 atomic_inc(&urb->dev->urbnum);
2180 if (map_urb_for_dma(hcd, urb, GFP_KERNEL)) {
2181 usb_put_urb(urb);
2182 usb_free_urb(urb);
2183 return NULL;
2184 }
2185
2186 urb->context = done;
2187 return urb;
2188}
2189
2190int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
2191{
2192 int retval = -ENOMEM;
2193 struct usb_ctrlrequest *dr;
2194 struct urb *urb;
2195 struct usb_device *udev;
2196 struct usb_device_descriptor *buf;
2197 DECLARE_COMPLETION_ONSTACK(done);
2198
2199 /* Obtain udev of the rhub's child port */
2200 udev = usb_hub_find_child(hcd->self.root_hub, port);
2201 if (!udev) {
2202 dev_err(hcd->self.controller, "No device attached to the RootHub\n");
2203 return -ENODEV;
2204 }
2205 buf = kmalloc(USB_DT_DEVICE_SIZE, GFP_KERNEL);
2206 if (!buf)
2207 return -ENOMEM;
2208
2209 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
2210 if (!dr) {
2211 kfree(buf);
2212 return -ENOMEM;
2213 }
2214
2215 /* Fill Setup packet for GetDescriptor */
2216 dr->bRequestType = USB_DIR_IN;
2217 dr->bRequest = USB_REQ_GET_DESCRIPTOR;
2218 dr->wValue = cpu_to_le16(USB_DT_DEVICE << 8);
2219 dr->wIndex = 0;
2220 dr->wLength = cpu_to_le16(USB_DT_DEVICE_SIZE);
2221 urb = request_single_step_set_feature_urb(udev, dr, buf, &done);
2222 if (!urb)
2223 goto cleanup;
2224
2225 /* Submit just the SETUP stage */
2226 retval = hcd->driver->submit_single_step_set_feature(hcd, urb, 1);
2227 if (retval)
2228 goto out1;
2229 if (!wait_for_completion_timeout(&done, msecs_to_jiffies(2000))) {
2230 usb_kill_urb(urb);
2231 retval = -ETIMEDOUT;
2232 dev_err(hcd->self.controller,
2233 "%s SETUP stage timed out on ep0\n", __func__);
2234 goto out1;
2235 }
2236 msleep(15 * 1000);
2237
2238 /* Complete remaining DATA and STATUS stages using the same URB */
2239 urb->status = -EINPROGRESS;
2240 usb_get_urb(urb);
2241 atomic_inc(&urb->use_count);
2242 atomic_inc(&urb->dev->urbnum);
2243 retval = hcd->driver->submit_single_step_set_feature(hcd, urb, 0);
2244 if (!retval && !wait_for_completion_timeout(&done,
2245 msecs_to_jiffies(2000))) {
2246 usb_kill_urb(urb);
2247 retval = -ETIMEDOUT;
2248 dev_err(hcd->self.controller,
2249 "%s IN stage timed out on ep0\n", __func__);
2250 }
2251out1:
2252 usb_free_urb(urb);
2253cleanup:
2254 kfree(dr);
2255 kfree(buf);
2256 return retval;
2257}
2258EXPORT_SYMBOL_GPL(ehset_single_step_set_feature);
2259#endif /* CONFIG_USB_HCD_TEST_MODE */
2260
2261/*-------------------------------------------------------------------------*/
2262
2263#ifdef CONFIG_PM
2264
2265int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)
2266{
2267 struct usb_hcd *hcd = bus_to_hcd(rhdev->bus);
2268 int status;
2269 int old_state = hcd->state;
2270
2271 dev_dbg(&rhdev->dev, "bus %ssuspend, wakeup %d\n",
2272 (PMSG_IS_AUTO(msg) ? "auto-" : ""),
2273 rhdev->do_remote_wakeup);
2274 if (HCD_DEAD(hcd)) {
2275 dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "suspend");
2276 return 0;
2277 }
2278
2279 if (!hcd->driver->bus_suspend) {
2280 status = -ENOENT;
2281 } else {
2282 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2283 hcd->state = HC_STATE_QUIESCING;
2284 status = hcd->driver->bus_suspend(hcd);
2285 }
2286 if (status == 0) {
2287 usb_set_device_state(rhdev, USB_STATE_SUSPENDED);
2288 hcd->state = HC_STATE_SUSPENDED;
2289
2290 if (!PMSG_IS_AUTO(msg))
2291 usb_phy_roothub_suspend(hcd->self.sysdev,
2292 hcd->phy_roothub);
2293
2294 /* Did we race with a root-hub wakeup event? */
2295 if (rhdev->do_remote_wakeup) {
2296 char buffer[6];
2297
2298 status = hcd->driver->hub_status_data(hcd, buffer);
2299 if (status != 0) {
2300 dev_dbg(&rhdev->dev, "suspend raced with wakeup event\n");
2301 hcd_bus_resume(rhdev, PMSG_AUTO_RESUME);
2302 status = -EBUSY;
2303 }
2304 }
2305 } else {
2306 spin_lock_irq(&hcd_root_hub_lock);
2307 if (!HCD_DEAD(hcd)) {
2308 set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2309 hcd->state = old_state;
2310 }
2311 spin_unlock_irq(&hcd_root_hub_lock);
2312 dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
2313 "suspend", status);
2314 }
2315 return status;
2316}
2317
2318int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
2319{
2320 struct usb_hcd *hcd = bus_to_hcd(rhdev->bus);
2321 int status;
2322 int old_state = hcd->state;
2323
2324 dev_dbg(&rhdev->dev, "usb %sresume\n",
2325 (PMSG_IS_AUTO(msg) ? "auto-" : ""));
2326 if (HCD_DEAD(hcd)) {
2327 dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "resume");
2328 return 0;
2329 }
2330
2331 if (!PMSG_IS_AUTO(msg)) {
2332 status = usb_phy_roothub_resume(hcd->self.sysdev,
2333 hcd->phy_roothub);
2334 if (status)
2335 return status;
2336 }
2337
2338 if (!hcd->driver->bus_resume)
2339 return -ENOENT;
2340 if (HCD_RH_RUNNING(hcd))
2341 return 0;
2342
2343 hcd->state = HC_STATE_RESUMING;
2344 status = hcd->driver->bus_resume(hcd);
2345 clear_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
2346 if (status == 0)
2347 status = usb_phy_roothub_calibrate(hcd->phy_roothub);
2348
2349 if (status == 0) {
2350 struct usb_device *udev;
2351 int port1;
2352
2353 spin_lock_irq(&hcd_root_hub_lock);
2354 if (!HCD_DEAD(hcd)) {
2355 usb_set_device_state(rhdev, rhdev->actconfig
2356 ? USB_STATE_CONFIGURED
2357 : USB_STATE_ADDRESS);
2358 set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2359 hcd->state = HC_STATE_RUNNING;
2360 }
2361 spin_unlock_irq(&hcd_root_hub_lock);
2362
2363 /*
2364 * Check whether any of the enabled ports on the root hub are
2365 * unsuspended. If they are then a TRSMRCY delay is needed
2366 * (this is what the USB-2 spec calls a "global resume").
2367 * Otherwise we can skip the delay.
2368 */
2369 usb_hub_for_each_child(rhdev, port1, udev) {
2370 if (udev->state != USB_STATE_NOTATTACHED &&
2371 !udev->port_is_suspended) {
2372 usleep_range(10000, 11000); /* TRSMRCY */
2373 break;
2374 }
2375 }
2376 } else {
2377 hcd->state = old_state;
2378 usb_phy_roothub_suspend(hcd->self.sysdev, hcd->phy_roothub);
2379 dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
2380 "resume", status);
2381 if (status != -ESHUTDOWN)
2382 usb_hc_died(hcd);
2383 }
2384 return status;
2385}
2386
2387/* Workqueue routine for root-hub remote wakeup */
2388static void hcd_resume_work(struct work_struct *work)
2389{
2390 struct usb_hcd *hcd = container_of(work, struct usb_hcd, wakeup_work);
2391 struct usb_device *udev = hcd->self.root_hub;
2392
2393 usb_remote_wakeup(udev);
2394}
2395
2396/**
2397 * usb_hcd_resume_root_hub - called by HCD to resume its root hub
2398 * @hcd: host controller for this root hub
2399 *
2400 * The USB host controller calls this function when its root hub is
2401 * suspended (with the remote wakeup feature enabled) and a remote
2402 * wakeup request is received. The routine submits a workqueue request
2403 * to resume the root hub (that is, manage its downstream ports again).
2404 */
2405void usb_hcd_resume_root_hub (struct usb_hcd *hcd)
2406{
2407 unsigned long flags;
2408
2409 spin_lock_irqsave (&hcd_root_hub_lock, flags);
2410 if (hcd->rh_registered) {
2411 pm_wakeup_event(&hcd->self.root_hub->dev, 0);
2412 set_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
2413 queue_work(pm_wq, &hcd->wakeup_work);
2414 }
2415 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
2416}
2417EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub);
2418
2419#endif /* CONFIG_PM */
2420
2421/*-------------------------------------------------------------------------*/
2422
2423#ifdef CONFIG_USB_OTG
2424
2425/**
2426 * usb_bus_start_enum - start immediate enumeration (for OTG)
2427 * @bus: the bus (must use hcd framework)
2428 * @port_num: 1-based number of port; usually bus->otg_port
2429 * Context: atomic
2430 *
2431 * Starts enumeration, with an immediate reset followed later by
2432 * hub_wq identifying and possibly configuring the device.
2433 * This is needed by OTG controller drivers, where it helps meet
2434 * HNP protocol timing requirements for starting a port reset.
2435 *
2436 * Return: 0 if successful.
2437 */
2438int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num)
2439{
2440 struct usb_hcd *hcd;
2441 int status = -EOPNOTSUPP;
2442
2443 /* NOTE: since HNP can't start by grabbing the bus's address0_sem,
2444 * boards with root hubs hooked up to internal devices (instead of
2445 * just the OTG port) may need more attention to resetting...
2446 */
2447 hcd = bus_to_hcd(bus);
2448 if (port_num && hcd->driver->start_port_reset)
2449 status = hcd->driver->start_port_reset(hcd, port_num);
2450
2451 /* allocate hub_wq shortly after (first) root port reset finishes;
2452 * it may issue others, until at least 50 msecs have passed.
2453 */
2454 if (status == 0)
2455 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10));
2456 return status;
2457}
2458EXPORT_SYMBOL_GPL(usb_bus_start_enum);
2459
2460#endif
2461
2462/*-------------------------------------------------------------------------*/
2463
2464/**
2465 * usb_hcd_irq - hook IRQs to HCD framework (bus glue)
2466 * @irq: the IRQ being raised
2467 * @__hcd: pointer to the HCD whose IRQ is being signaled
2468 *
2469 * If the controller isn't HALTed, calls the driver's irq handler.
2470 * Checks whether the controller is now dead.
2471 *
2472 * Return: %IRQ_HANDLED if the IRQ was handled. %IRQ_NONE otherwise.
2473 */
2474irqreturn_t usb_hcd_irq (int irq, void *__hcd)
2475{
2476 struct usb_hcd *hcd = __hcd;
2477 irqreturn_t rc;
2478
2479 if (unlikely(HCD_DEAD(hcd) || !HCD_HW_ACCESSIBLE(hcd)))
2480 rc = IRQ_NONE;
2481 else if (hcd->driver->irq(hcd) == IRQ_NONE)
2482 rc = IRQ_NONE;
2483 else
2484 rc = IRQ_HANDLED;
2485
2486 return rc;
2487}
2488EXPORT_SYMBOL_GPL(usb_hcd_irq);
2489
2490/*-------------------------------------------------------------------------*/
2491
2492/* Workqueue routine for when the root-hub has died. */
2493static void hcd_died_work(struct work_struct *work)
2494{
2495 struct usb_hcd *hcd = container_of(work, struct usb_hcd, died_work);
2496 static char *env[] = {
2497 "ERROR=DEAD",
2498 NULL
2499 };
2500
2501 /* Notify user space that the host controller has died */
2502 kobject_uevent_env(&hcd->self.root_hub->dev.kobj, KOBJ_OFFLINE, env);
2503}
2504
2505/**
2506 * usb_hc_died - report abnormal shutdown of a host controller (bus glue)
2507 * @hcd: pointer to the HCD representing the controller
2508 *
2509 * This is called by bus glue to report a USB host controller that died
2510 * while operations may still have been pending. It's called automatically
2511 * by the PCI glue, so only glue for non-PCI busses should need to call it.
2512 *
2513 * Only call this function with the primary HCD.
2514 */
2515void usb_hc_died (struct usb_hcd *hcd)
2516{
2517 unsigned long flags;
2518
2519 dev_err (hcd->self.controller, "HC died; cleaning up\n");
2520
2521 spin_lock_irqsave (&hcd_root_hub_lock, flags);
2522 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2523 set_bit(HCD_FLAG_DEAD, &hcd->flags);
2524 if (hcd->rh_registered) {
2525 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2526
2527 /* make hub_wq clean up old urbs and devices */
2528 usb_set_device_state (hcd->self.root_hub,
2529 USB_STATE_NOTATTACHED);
2530 usb_kick_hub_wq(hcd->self.root_hub);
2531 }
2532 if (usb_hcd_is_primary_hcd(hcd) && hcd->shared_hcd) {
2533 hcd = hcd->shared_hcd;
2534 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2535 set_bit(HCD_FLAG_DEAD, &hcd->flags);
2536 if (hcd->rh_registered) {
2537 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2538
2539 /* make hub_wq clean up old urbs and devices */
2540 usb_set_device_state(hcd->self.root_hub,
2541 USB_STATE_NOTATTACHED);
2542 usb_kick_hub_wq(hcd->self.root_hub);
2543 }
2544 }
2545
2546 /* Handle the case where this function gets called with a shared HCD */
2547 if (usb_hcd_is_primary_hcd(hcd))
2548 schedule_work(&hcd->died_work);
2549 else
2550 schedule_work(&hcd->primary_hcd->died_work);
2551
2552 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
2553 /* Make sure that the other roothub is also deallocated. */
2554}
2555EXPORT_SYMBOL_GPL (usb_hc_died);
2556
2557/*-------------------------------------------------------------------------*/
2558
2559static void init_giveback_urb_bh(struct giveback_urb_bh *bh)
2560{
2561
2562 spin_lock_init(&bh->lock);
2563 INIT_LIST_HEAD(&bh->head);
2564 tasklet_setup(&bh->bh, usb_giveback_urb_bh);
2565}
2566
2567struct usb_hcd *__usb_create_hcd(const struct hc_driver *driver,
2568 struct device *sysdev, struct device *dev, const char *bus_name,
2569 struct usb_hcd *primary_hcd)
2570{
2571 struct usb_hcd *hcd;
2572
2573 hcd = kzalloc(sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL);
2574 if (!hcd)
2575 return NULL;
2576 if (primary_hcd == NULL) {
2577 hcd->address0_mutex = kmalloc(sizeof(*hcd->address0_mutex),
2578 GFP_KERNEL);
2579 if (!hcd->address0_mutex) {
2580 kfree(hcd);
2581 dev_dbg(dev, "hcd address0 mutex alloc failed\n");
2582 return NULL;
2583 }
2584 mutex_init(hcd->address0_mutex);
2585 hcd->bandwidth_mutex = kmalloc(sizeof(*hcd->bandwidth_mutex),
2586 GFP_KERNEL);
2587 if (!hcd->bandwidth_mutex) {
2588 kfree(hcd->address0_mutex);
2589 kfree(hcd);
2590 dev_dbg(dev, "hcd bandwidth mutex alloc failed\n");
2591 return NULL;
2592 }
2593 mutex_init(hcd->bandwidth_mutex);
2594 dev_set_drvdata(dev, hcd);
2595 } else {
2596 mutex_lock(&usb_port_peer_mutex);
2597 hcd->address0_mutex = primary_hcd->address0_mutex;
2598 hcd->bandwidth_mutex = primary_hcd->bandwidth_mutex;
2599 hcd->primary_hcd = primary_hcd;
2600 primary_hcd->primary_hcd = primary_hcd;
2601 hcd->shared_hcd = primary_hcd;
2602 primary_hcd->shared_hcd = hcd;
2603 mutex_unlock(&usb_port_peer_mutex);
2604 }
2605
2606 kref_init(&hcd->kref);
2607
2608 usb_bus_init(&hcd->self);
2609 hcd->self.controller = dev;
2610 hcd->self.sysdev = sysdev;
2611 hcd->self.bus_name = bus_name;
2612
2613 timer_setup(&hcd->rh_timer, rh_timer_func, 0);
2614#ifdef CONFIG_PM
2615 INIT_WORK(&hcd->wakeup_work, hcd_resume_work);
2616#endif
2617
2618 INIT_WORK(&hcd->died_work, hcd_died_work);
2619
2620 hcd->driver = driver;
2621 hcd->speed = driver->flags & HCD_MASK;
2622 hcd->product_desc = (driver->product_desc) ? driver->product_desc :
2623 "USB Host Controller";
2624 return hcd;
2625}
2626EXPORT_SYMBOL_GPL(__usb_create_hcd);
2627
2628/**
2629 * usb_create_shared_hcd - create and initialize an HCD structure
2630 * @driver: HC driver that will use this hcd
2631 * @dev: device for this HC, stored in hcd->self.controller
2632 * @bus_name: value to store in hcd->self.bus_name
2633 * @primary_hcd: a pointer to the usb_hcd structure that is sharing the
2634 * PCI device. Only allocate certain resources for the primary HCD
2635 *
2636 * Context: task context, might sleep.
2637 *
2638 * Allocate a struct usb_hcd, with extra space at the end for the
2639 * HC driver's private data. Initialize the generic members of the
2640 * hcd structure.
2641 *
2642 * Return: On success, a pointer to the created and initialized HCD structure.
2643 * On failure (e.g. if memory is unavailable), %NULL.
2644 */
2645struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
2646 struct device *dev, const char *bus_name,
2647 struct usb_hcd *primary_hcd)
2648{
2649 return __usb_create_hcd(driver, dev, dev, bus_name, primary_hcd);
2650}
2651EXPORT_SYMBOL_GPL(usb_create_shared_hcd);
2652
2653/**
2654 * usb_create_hcd - create and initialize an HCD structure
2655 * @driver: HC driver that will use this hcd
2656 * @dev: device for this HC, stored in hcd->self.controller
2657 * @bus_name: value to store in hcd->self.bus_name
2658 *
2659 * Context: task context, might sleep.
2660 *
2661 * Allocate a struct usb_hcd, with extra space at the end for the
2662 * HC driver's private data. Initialize the generic members of the
2663 * hcd structure.
2664 *
2665 * Return: On success, a pointer to the created and initialized HCD
2666 * structure. On failure (e.g. if memory is unavailable), %NULL.
2667 */
2668struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
2669 struct device *dev, const char *bus_name)
2670{
2671 return __usb_create_hcd(driver, dev, dev, bus_name, NULL);
2672}
2673EXPORT_SYMBOL_GPL(usb_create_hcd);
2674
2675/*
2676 * Roothubs that share one PCI device must also share the bandwidth mutex.
2677 * Don't deallocate the bandwidth_mutex until the last shared usb_hcd is
2678 * deallocated.
2679 *
2680 * Make sure to deallocate the bandwidth_mutex only when the last HCD is
2681 * freed. When hcd_release() is called for either hcd in a peer set,
2682 * invalidate the peer's ->shared_hcd and ->primary_hcd pointers.
2683 */
2684static void hcd_release(struct kref *kref)
2685{
2686 struct usb_hcd *hcd = container_of (kref, struct usb_hcd, kref);
2687
2688 mutex_lock(&usb_port_peer_mutex);
2689 if (hcd->shared_hcd) {
2690 struct usb_hcd *peer = hcd->shared_hcd;
2691
2692 peer->shared_hcd = NULL;
2693 peer->primary_hcd = NULL;
2694 } else {
2695 kfree(hcd->address0_mutex);
2696 kfree(hcd->bandwidth_mutex);
2697 }
2698 mutex_unlock(&usb_port_peer_mutex);
2699 kfree(hcd);
2700}
2701
2702struct usb_hcd *usb_get_hcd (struct usb_hcd *hcd)
2703{
2704 if (hcd)
2705 kref_get (&hcd->kref);
2706 return hcd;
2707}
2708EXPORT_SYMBOL_GPL(usb_get_hcd);
2709
2710void usb_put_hcd (struct usb_hcd *hcd)
2711{
2712 if (hcd)
2713 kref_put (&hcd->kref, hcd_release);
2714}
2715EXPORT_SYMBOL_GPL(usb_put_hcd);
2716
2717int usb_hcd_is_primary_hcd(struct usb_hcd *hcd)
2718{
2719 if (!hcd->primary_hcd)
2720 return 1;
2721 return hcd == hcd->primary_hcd;
2722}
2723EXPORT_SYMBOL_GPL(usb_hcd_is_primary_hcd);
2724
2725int usb_hcd_find_raw_port_number(struct usb_hcd *hcd, int port1)
2726{
2727 if (!hcd->driver->find_raw_port_number)
2728 return port1;
2729
2730 return hcd->driver->find_raw_port_number(hcd, port1);
2731}
2732
2733static int usb_hcd_request_irqs(struct usb_hcd *hcd,
2734 unsigned int irqnum, unsigned long irqflags)
2735{
2736 int retval;
2737
2738 if (hcd->driver->irq) {
2739
2740 snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d",
2741 hcd->driver->description, hcd->self.busnum);
2742 retval = request_irq(irqnum, &usb_hcd_irq, irqflags,
2743 hcd->irq_descr, hcd);
2744 if (retval != 0) {
2745 dev_err(hcd->self.controller,
2746 "request interrupt %d failed\n",
2747 irqnum);
2748 return retval;
2749 }
2750 hcd->irq = irqnum;
2751 dev_info(hcd->self.controller, "irq %d, %s 0x%08llx\n", irqnum,
2752 (hcd->driver->flags & HCD_MEMORY) ?
2753 "io mem" : "io port",
2754 (unsigned long long)hcd->rsrc_start);
2755 } else {
2756 hcd->irq = 0;
2757 if (hcd->rsrc_start)
2758 dev_info(hcd->self.controller, "%s 0x%08llx\n",
2759 (hcd->driver->flags & HCD_MEMORY) ?
2760 "io mem" : "io port",
2761 (unsigned long long)hcd->rsrc_start);
2762 }
2763 return 0;
2764}
2765
2766/*
2767 * Before we free this root hub, flush in-flight peering attempts
2768 * and disable peer lookups
2769 */
2770static void usb_put_invalidate_rhdev(struct usb_hcd *hcd)
2771{
2772 struct usb_device *rhdev;
2773
2774 mutex_lock(&usb_port_peer_mutex);
2775 rhdev = hcd->self.root_hub;
2776 hcd->self.root_hub = NULL;
2777 mutex_unlock(&usb_port_peer_mutex);
2778 usb_put_dev(rhdev);
2779}
2780
2781/**
2782 * usb_stop_hcd - Halt the HCD
2783 * @hcd: the usb_hcd that has to be halted
2784 *
2785 * Stop the root-hub polling timer and invoke the HCD's ->stop callback.
2786 */
2787static void usb_stop_hcd(struct usb_hcd *hcd)
2788{
2789 hcd->rh_pollable = 0;
2790 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2791 del_timer_sync(&hcd->rh_timer);
2792
2793 hcd->driver->stop(hcd);
2794 hcd->state = HC_STATE_HALT;
2795
2796 /* In case the HCD restarted the timer, stop it again. */
2797 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2798 del_timer_sync(&hcd->rh_timer);
2799}
2800
2801/**
2802 * usb_add_hcd - finish generic HCD structure initialization and register
2803 * @hcd: the usb_hcd structure to initialize
2804 * @irqnum: Interrupt line to allocate
2805 * @irqflags: Interrupt type flags
2806 *
2807 * Finish the remaining parts of generic HCD initialization: allocate the
2808 * buffers of consistent memory, register the bus, request the IRQ line,
2809 * and call the driver's reset() and start() routines.
2810 */
2811int usb_add_hcd(struct usb_hcd *hcd,
2812 unsigned int irqnum, unsigned long irqflags)
2813{
2814 int retval;
2815 struct usb_device *rhdev;
2816 struct usb_hcd *shared_hcd;
2817
2818 if (!hcd->skip_phy_initialization && usb_hcd_is_primary_hcd(hcd)) {
2819 hcd->phy_roothub = usb_phy_roothub_alloc(hcd->self.sysdev);
2820 if (IS_ERR(hcd->phy_roothub))
2821 return PTR_ERR(hcd->phy_roothub);
2822
2823 retval = usb_phy_roothub_init(hcd->phy_roothub);
2824 if (retval)
2825 return retval;
2826
2827 retval = usb_phy_roothub_set_mode(hcd->phy_roothub,
2828 PHY_MODE_USB_HOST_SS);
2829 if (retval)
2830 retval = usb_phy_roothub_set_mode(hcd->phy_roothub,
2831 PHY_MODE_USB_HOST);
2832 if (retval)
2833 goto err_usb_phy_roothub_power_on;
2834
2835 retval = usb_phy_roothub_power_on(hcd->phy_roothub);
2836 if (retval)
2837 goto err_usb_phy_roothub_power_on;
2838 }
2839
2840 dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
2841
2842 switch (authorized_default) {
2843 case USB_AUTHORIZE_NONE:
2844 hcd->dev_policy = USB_DEVICE_AUTHORIZE_NONE;
2845 break;
2846
2847 case USB_AUTHORIZE_ALL:
2848 hcd->dev_policy = USB_DEVICE_AUTHORIZE_ALL;
2849 break;
2850
2851 case USB_AUTHORIZE_INTERNAL:
2852 hcd->dev_policy = USB_DEVICE_AUTHORIZE_INTERNAL;
2853 break;
2854
2855 case USB_AUTHORIZE_WIRED:
2856 default:
2857 hcd->dev_policy = hcd->wireless ?
2858 USB_DEVICE_AUTHORIZE_NONE : USB_DEVICE_AUTHORIZE_ALL;
2859 break;
2860 }
2861
2862 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2863
2864 /* per default all interfaces are authorized */
2865 set_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
2866
2867 /* HC is in reset state, but accessible. Now do the one-time init,
2868 * bottom up so that hcds can customize the root hubs before hub_wq
2869 * starts talking to them. (Note, bus id is assigned early too.)
2870 */
2871 retval = hcd_buffer_create(hcd);
2872 if (retval != 0) {
2873 dev_dbg(hcd->self.sysdev, "pool alloc failed\n");
2874 goto err_create_buf;
2875 }
2876
2877 retval = usb_register_bus(&hcd->self);
2878 if (retval < 0)
2879 goto err_register_bus;
2880
2881 rhdev = usb_alloc_dev(NULL, &hcd->self, 0);
2882 if (rhdev == NULL) {
2883 dev_err(hcd->self.sysdev, "unable to allocate root hub\n");
2884 retval = -ENOMEM;
2885 goto err_allocate_root_hub;
2886 }
2887 mutex_lock(&usb_port_peer_mutex);
2888 hcd->self.root_hub = rhdev;
2889 mutex_unlock(&usb_port_peer_mutex);
2890
2891 rhdev->rx_lanes = 1;
2892 rhdev->tx_lanes = 1;
2893 rhdev->ssp_rate = USB_SSP_GEN_UNKNOWN;
2894
2895 switch (hcd->speed) {
2896 case HCD_USB11:
2897 rhdev->speed = USB_SPEED_FULL;
2898 break;
2899 case HCD_USB2:
2900 rhdev->speed = USB_SPEED_HIGH;
2901 break;
2902 case HCD_USB25:
2903 rhdev->speed = USB_SPEED_WIRELESS;
2904 break;
2905 case HCD_USB3:
2906 rhdev->speed = USB_SPEED_SUPER;
2907 break;
2908 case HCD_USB32:
2909 rhdev->rx_lanes = 2;
2910 rhdev->tx_lanes = 2;
2911 rhdev->ssp_rate = USB_SSP_GEN_2x2;
2912 rhdev->speed = USB_SPEED_SUPER_PLUS;
2913 break;
2914 case HCD_USB31:
2915 rhdev->ssp_rate = USB_SSP_GEN_2x1;
2916 rhdev->speed = USB_SPEED_SUPER_PLUS;
2917 break;
2918 default:
2919 retval = -EINVAL;
2920 goto err_set_rh_speed;
2921 }
2922
2923 /* wakeup flag init defaults to "everything works" for root hubs,
2924 * but drivers can override it in reset() if needed, along with
2925 * recording the overall controller's system wakeup capability.
2926 */
2927 device_set_wakeup_capable(&rhdev->dev, 1);
2928
2929 /* HCD_FLAG_RH_RUNNING doesn't matter until the root hub is
2930 * registered. But since the controller can die at any time,
2931 * let's initialize the flag before touching the hardware.
2932 */
2933 set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2934
2935 /* "reset" is misnamed; its role is now one-time init. the controller
2936 * should already have been reset (and boot firmware kicked off etc).
2937 */
2938 if (hcd->driver->reset) {
2939 retval = hcd->driver->reset(hcd);
2940 if (retval < 0) {
2941 dev_err(hcd->self.controller, "can't setup: %d\n",
2942 retval);
2943 goto err_hcd_driver_setup;
2944 }
2945 }
2946 hcd->rh_pollable = 1;
2947
2948 retval = usb_phy_roothub_calibrate(hcd->phy_roothub);
2949 if (retval)
2950 goto err_hcd_driver_setup;
2951
2952 /* NOTE: root hub and controller capabilities may not be the same */
2953 if (device_can_wakeup(hcd->self.controller)
2954 && device_can_wakeup(&hcd->self.root_hub->dev))
2955 dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
2956
2957 /* initialize tasklets */
2958 init_giveback_urb_bh(&hcd->high_prio_bh);
2959 hcd->high_prio_bh.high_prio = true;
2960 init_giveback_urb_bh(&hcd->low_prio_bh);
2961
2962 /* enable irqs just before we start the controller,
2963 * if the BIOS provides legacy PCI irqs.
2964 */
2965 if (usb_hcd_is_primary_hcd(hcd) && irqnum) {
2966 retval = usb_hcd_request_irqs(hcd, irqnum, irqflags);
2967 if (retval)
2968 goto err_request_irq;
2969 }
2970
2971 hcd->state = HC_STATE_RUNNING;
2972 retval = hcd->driver->start(hcd);
2973 if (retval < 0) {
2974 dev_err(hcd->self.controller, "startup error %d\n", retval);
2975 goto err_hcd_driver_start;
2976 }
2977
2978 /* starting here, usbcore will pay attention to the shared HCD roothub */
2979 shared_hcd = hcd->shared_hcd;
2980 if (!usb_hcd_is_primary_hcd(hcd) && shared_hcd && HCD_DEFER_RH_REGISTER(shared_hcd)) {
2981 retval = register_root_hub(shared_hcd);
2982 if (retval != 0)
2983 goto err_register_root_hub;
2984
2985 if (shared_hcd->uses_new_polling && HCD_POLL_RH(shared_hcd))
2986 usb_hcd_poll_rh_status(shared_hcd);
2987 }
2988
2989 /* starting here, usbcore will pay attention to this root hub */
2990 if (!HCD_DEFER_RH_REGISTER(hcd)) {
2991 retval = register_root_hub(hcd);
2992 if (retval != 0)
2993 goto err_register_root_hub;
2994
2995 if (hcd->uses_new_polling && HCD_POLL_RH(hcd))
2996 usb_hcd_poll_rh_status(hcd);
2997 }
2998
2999 return retval;
3000
3001err_register_root_hub:
3002 usb_stop_hcd(hcd);
3003err_hcd_driver_start:
3004 if (usb_hcd_is_primary_hcd(hcd) && hcd->irq > 0)
3005 free_irq(irqnum, hcd);
3006err_request_irq:
3007err_hcd_driver_setup:
3008err_set_rh_speed:
3009 usb_put_invalidate_rhdev(hcd);
3010err_allocate_root_hub:
3011 usb_deregister_bus(&hcd->self);
3012err_register_bus:
3013 hcd_buffer_destroy(hcd);
3014err_create_buf:
3015 usb_phy_roothub_power_off(hcd->phy_roothub);
3016err_usb_phy_roothub_power_on:
3017 usb_phy_roothub_exit(hcd->phy_roothub);
3018
3019 return retval;
3020}
3021EXPORT_SYMBOL_GPL(usb_add_hcd);
3022
3023/**
3024 * usb_remove_hcd - shutdown processing for generic HCDs
3025 * @hcd: the usb_hcd structure to remove
3026 *
3027 * Context: task context, might sleep.
3028 *
3029 * Disconnects the root hub, then reverses the effects of usb_add_hcd(),
3030 * invoking the HCD's stop() method.
3031 */
3032void usb_remove_hcd(struct usb_hcd *hcd)
3033{
3034 struct usb_device *rhdev;
3035 bool rh_registered;
3036
3037 if (!hcd) {
3038 pr_debug("%s: hcd is NULL\n", __func__);
3039 return;
3040 }
3041 rhdev = hcd->self.root_hub;
3042
3043 dev_info(hcd->self.controller, "remove, state %x\n", hcd->state);
3044
3045 usb_get_dev(rhdev);
3046 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
3047 if (HC_IS_RUNNING (hcd->state))
3048 hcd->state = HC_STATE_QUIESCING;
3049
3050 dev_dbg(hcd->self.controller, "roothub graceful disconnect\n");
3051 spin_lock_irq (&hcd_root_hub_lock);
3052 rh_registered = hcd->rh_registered;
3053 hcd->rh_registered = 0;
3054 spin_unlock_irq (&hcd_root_hub_lock);
3055
3056#ifdef CONFIG_PM
3057 cancel_work_sync(&hcd->wakeup_work);
3058#endif
3059 cancel_work_sync(&hcd->died_work);
3060
3061 mutex_lock(&usb_bus_idr_lock);
3062 if (rh_registered)
3063 usb_disconnect(&rhdev); /* Sets rhdev to NULL */
3064 mutex_unlock(&usb_bus_idr_lock);
3065
3066 /*
3067 * tasklet_kill() isn't needed here because:
3068 * - driver's disconnect() called from usb_disconnect() should
3069 * make sure its URBs are completed during the disconnect()
3070 * callback
3071 *
3072 * - it is too late to run complete() here since driver may have
3073 * been removed already now
3074 */
3075
3076 /* Prevent any more root-hub status calls from the timer.
3077 * The HCD might still restart the timer (if a port status change
3078 * interrupt occurs), but usb_hcd_poll_rh_status() won't invoke
3079 * the hub_status_data() callback.
3080 */
3081 usb_stop_hcd(hcd);
3082
3083 if (usb_hcd_is_primary_hcd(hcd)) {
3084 if (hcd->irq > 0)
3085 free_irq(hcd->irq, hcd);
3086 }
3087
3088 usb_deregister_bus(&hcd->self);
3089 hcd_buffer_destroy(hcd);
3090
3091 usb_phy_roothub_power_off(hcd->phy_roothub);
3092 usb_phy_roothub_exit(hcd->phy_roothub);
3093
3094 usb_put_invalidate_rhdev(hcd);
3095 hcd->flags = 0;
3096}
3097EXPORT_SYMBOL_GPL(usb_remove_hcd);
3098
3099void
3100usb_hcd_platform_shutdown(struct platform_device *dev)
3101{
3102 struct usb_hcd *hcd = platform_get_drvdata(dev);
3103
3104 /* No need for pm_runtime_put(), we're shutting down */
3105 pm_runtime_get_sync(&dev->dev);
3106
3107 if (hcd->driver->shutdown)
3108 hcd->driver->shutdown(hcd);
3109}
3110EXPORT_SYMBOL_GPL(usb_hcd_platform_shutdown);
3111
3112int usb_hcd_setup_local_mem(struct usb_hcd *hcd, phys_addr_t phys_addr,
3113 dma_addr_t dma, size_t size)
3114{
3115 int err;
3116 void *local_mem;
3117
3118 hcd->localmem_pool = devm_gen_pool_create(hcd->self.sysdev, 4,
3119 dev_to_node(hcd->self.sysdev),
3120 dev_name(hcd->self.sysdev));
3121 if (IS_ERR(hcd->localmem_pool))
3122 return PTR_ERR(hcd->localmem_pool);
3123
3124 /*
3125 * if a physical SRAM address was passed, map it, otherwise
3126 * allocate system memory as a buffer.
3127 */
3128 if (phys_addr)
3129 local_mem = devm_memremap(hcd->self.sysdev, phys_addr,
3130 size, MEMREMAP_WC);
3131 else
3132 local_mem = dmam_alloc_attrs(hcd->self.sysdev, size, &dma,
3133 GFP_KERNEL,
3134 DMA_ATTR_WRITE_COMBINE);
3135
3136 if (IS_ERR_OR_NULL(local_mem)) {
3137 if (!local_mem)
3138 return -ENOMEM;
3139
3140 return PTR_ERR(local_mem);
3141 }
3142
3143 /*
3144 * Here we pass a dma_addr_t but the arg type is a phys_addr_t.
3145 * It's not backed by system memory and thus there's no kernel mapping
3146 * for it.
3147 */
3148 err = gen_pool_add_virt(hcd->localmem_pool, (unsigned long)local_mem,
3149 dma, size, dev_to_node(hcd->self.sysdev));
3150 if (err < 0) {
3151 dev_err(hcd->self.sysdev, "gen_pool_add_virt failed with %d\n",
3152 err);
3153 return err;
3154 }
3155
3156 return 0;
3157}
3158EXPORT_SYMBOL_GPL(usb_hcd_setup_local_mem);
3159
3160/*-------------------------------------------------------------------------*/
3161
3162#if IS_ENABLED(CONFIG_USB_MON)
3163
3164const struct usb_mon_operations *mon_ops;
3165
3166/*
3167 * The registration is unlocked.
3168 * We do it this way because we do not want to lock in hot paths.
3169 *
3170 * Notice that the code is minimally error-proof. Because usbmon needs
3171 * symbols from usbcore, usbcore gets referenced and cannot be unloaded first.
3172 */
3173
3174int usb_mon_register(const struct usb_mon_operations *ops)
3175{
3176
3177 if (mon_ops)
3178 return -EBUSY;
3179
3180 mon_ops = ops;
3181 mb();
3182 return 0;
3183}
3184EXPORT_SYMBOL_GPL (usb_mon_register);
3185
3186void usb_mon_deregister (void)
3187{
3188
3189 if (mon_ops == NULL) {
3190 printk(KERN_ERR "USB: monitor was not registered\n");
3191 return;
3192 }
3193 mon_ops = NULL;
3194 mb();
3195}
3196EXPORT_SYMBOL_GPL (usb_mon_deregister);
3197
3198#endif /* CONFIG_USB_MON || CONFIG_USB_MON_MODULE */