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usb-core: Make usb_free_streams return an error
[deliverable/linux.git] / drivers / usb / core / hcd.c
CommitLineData
1da177e4
LT		 1/*
2 * (C) Copyright Linus Torvalds 1999
3 * (C) Copyright Johannes Erdfelt 1999-2001
4 * (C) Copyright Andreas Gal 1999
5 * (C) Copyright Gregory P. Smith 1999
6 * (C) Copyright Deti Fliegl 1999
7 * (C) Copyright Randy Dunlap 2000
8 * (C) Copyright David Brownell 2000-2002
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 * for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
b53d657d 25#include <linux/bcd.h>
1da177e4
LT		 26#include <linux/module.h>
27#include <linux/version.h>
28#include <linux/kernel.h>
29#include <linux/slab.h>
30#include <linux/completion.h>
31#include <linux/utsname.h>
32#include <linux/mm.h>
33#include <asm/io.h>
1da177e4
LT		 34#include <linux/device.h>
35#include <linux/dma-mapping.h>
4186ecf8 36#include <linux/mutex.h>
1da177e4
LT		 37#include <asm/irq.h>
38#include <asm/byteorder.h>
b3476675 39#include <asm/unaligned.h>
64a21d02 40#include <linux/platform_device.h>
6b157c9b 41#include <linux/workqueue.h>
da0aa716 42#include <linux/pm_runtime.h>
1da177e4
LT		 43
44#include <linux/usb.h>
27729aad 45#include <linux/usb/hcd.h>
1da177e4
LT		 46
47#include "usb.h"
1da177e4
LT		 48
49
1da177e4
LT		 50/*-------------------------------------------------------------------------*/
51
52/*
53 * USB Host Controller Driver framework
54 *
55 * Plugs into usbcore (usb_bus) and lets HCDs share code, minimizing
56 * HCD-specific behaviors/bugs.
57 *
58 * This does error checks, tracks devices and urbs, and delegates to a
59 * "hc_driver" only for code (and data) that really needs to know about
60 * hardware differences. That includes root hub registers, i/o queues,
61 * and so on ... but as little else as possible.
62 *
63 * Shared code includes most of the "root hub" code (these are emulated,
64 * though each HC's hardware works differently) and PCI glue, plus request
65 * tracking overhead. The HCD code should only block on spinlocks or on
66 * hardware handshaking; blocking on software events (such as other kernel
67 * threads releasing resources, or completing actions) is all generic.
68 *
69 * Happens the USB 2.0 spec says this would be invisible inside the "USBD",
70 * and includes mostly a "HCDI" (HCD Interface) along with some APIs used
71 * only by the hub driver ... and that neither should be seen or used by
72 * usb client device drivers.
73 *
74 * Contributors of ideas or unattributed patches include: David Brownell,
75 * Roman Weissgaerber, Rory Bolt, Greg Kroah-Hartman, ...
76 *
77 * HISTORY:
78 * 2002-02-21 Pull in most of the usb_bus support from usb.c; some
79 * associated cleanup. "usb_hcd" still != "usb_bus".
80 * 2001-12-12 Initial patch version for Linux 2.5.1 kernel.
81 */
82
83/*-------------------------------------------------------------------------*/
84
9beeee65
AS		 85/* Keep track of which host controller drivers are loaded */
86unsigned long usb_hcds_loaded;
87EXPORT_SYMBOL_GPL(usb_hcds_loaded);
88
1da177e4
LT		 89/* host controllers we manage */
90LIST_HEAD (usb_bus_list);
91EXPORT_SYMBOL_GPL (usb_bus_list);
92
93/* used when allocating bus numbers */
94#define USB_MAXBUS 64
95struct usb_busmap {
96 unsigned long busmap [USB_MAXBUS / (8*sizeof (unsigned long))];
97};
98static struct usb_busmap busmap;
99
100/* used when updating list of hcds */
4186ecf8 101DEFINE_MUTEX(usb_bus_list_lock); /* exported only for usbfs */
1da177e4
LT		 102EXPORT_SYMBOL_GPL (usb_bus_list_lock);
103
104/* used for controlling access to virtual root hubs */
105static DEFINE_SPINLOCK(hcd_root_hub_lock);
106
809a58b8
AS		 107/* used when updating an endpoint's URB list */
108static DEFINE_SPINLOCK(hcd_urb_list_lock);
1da177e4 109
cde217a5
AS		 110/* used to protect against unlinking URBs after the device is gone */
111static DEFINE_SPINLOCK(hcd_urb_unlink_lock);
112
1da177e4
LT		 113/* wait queue for synchronous unlinks */
114DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue);
115
809a58b8
AS		 116static inline int is_root_hub(struct usb_device *udev)
117{
118 return (udev->parent == NULL);
119}
120
1da177e4
LT		 121/*-------------------------------------------------------------------------*/
122
123/*
124 * Sharable chunks of root hub code.
125 */
126
127/*-------------------------------------------------------------------------*/
b53d657d
SAS		 128#define KERNEL_REL bin2bcd(((LINUX_VERSION_CODE >> 16) & 0x0ff))
129#define KERNEL_VER bin2bcd(((LINUX_VERSION_CODE >> 8) & 0x0ff))
1da177e4 130
d2e9b4d6
SS		 131/* usb 3.0 root hub device descriptor */
132static const u8 usb3_rh_dev_descriptor[18] = {
133 0x12, /* __u8 bLength; */
134 0x01, /* __u8 bDescriptorType; Device */
135 0x00, 0x03, /* __le16 bcdUSB; v3.0 */
136
137 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
138 0x00, /* __u8 bDeviceSubClass; */
139 0x03, /* __u8 bDeviceProtocol; USB 3.0 hub */
140 0x09, /* __u8 bMaxPacketSize0; 2^9 = 512 Bytes */
141
bfb8bfad 142 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
cd780694 143 0x03, 0x00, /* __le16 idProduct; device 0x0003 */
d2e9b4d6
SS		 144 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
145
146 0x03, /* __u8 iManufacturer; */
147 0x02, /* __u8 iProduct; */
148 0x01, /* __u8 iSerialNumber; */
149 0x01 /* __u8 bNumConfigurations; */
150};
151
1a81f881
TP		 152/* usb 2.5 (wireless USB 1.0) root hub device descriptor */
153static const u8 usb25_rh_dev_descriptor[18] = {
154 0x12, /* __u8 bLength; */
155 0x01, /* __u8 bDescriptorType; Device */
156 0x50, 0x02, /* __le16 bcdUSB; v2.5 */
157
158 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
159 0x00, /* __u8 bDeviceSubClass; */
160 0x00, /* __u8 bDeviceProtocol; [ usb 2.0 no TT ] */
161 0xFF, /* __u8 bMaxPacketSize0; always 0xFF (WUSB Spec 7.4.1). */
162
163 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
164 0x02, 0x00, /* __le16 idProduct; device 0x0002 */
165 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
166
167 0x03, /* __u8 iManufacturer; */
168 0x02, /* __u8 iProduct; */
169 0x01, /* __u8 iSerialNumber; */
170 0x01 /* __u8 bNumConfigurations; */
171};
172
1da177e4
LT		 173/* usb 2.0 root hub device descriptor */
174static const u8 usb2_rh_dev_descriptor [18] = {
175 0x12, /* __u8 bLength; */
176 0x01, /* __u8 bDescriptorType; Device */
177 0x00, 0x02, /* __le16 bcdUSB; v2.0 */
178
179 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
180 0x00, /* __u8 bDeviceSubClass; */
7329e211 181 0x00, /* __u8 bDeviceProtocol; [ usb 2.0 no TT ] */
16f16d11 182 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
1da177e4 183
bfb8bfad 184 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
667d691e 185 0x02, 0x00, /* __le16 idProduct; device 0x0002 */
1da177e4
LT		 186 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
187
188 0x03, /* __u8 iManufacturer; */
189 0x02, /* __u8 iProduct; */
190 0x01, /* __u8 iSerialNumber; */
191 0x01 /* __u8 bNumConfigurations; */
192};
193
194/* no usb 2.0 root hub "device qualifier" descriptor: one speed only */
195
196/* usb 1.1 root hub device descriptor */
197static const u8 usb11_rh_dev_descriptor [18] = {
198 0x12, /* __u8 bLength; */
199 0x01, /* __u8 bDescriptorType; Device */
200 0x10, 0x01, /* __le16 bcdUSB; v1.1 */
201
202 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
203 0x00, /* __u8 bDeviceSubClass; */
204 0x00, /* __u8 bDeviceProtocol; [ low/full speeds only ] */
16f16d11 205 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
1da177e4 206
bfb8bfad 207 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
667d691e 208 0x01, 0x00, /* __le16 idProduct; device 0x0001 */
1da177e4
LT		 209 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
210
211 0x03, /* __u8 iManufacturer; */
212 0x02, /* __u8 iProduct; */
213 0x01, /* __u8 iSerialNumber; */
214 0x01 /* __u8 bNumConfigurations; */
215};
216
217
218/*-------------------------------------------------------------------------*/
219
220/* Configuration descriptors for our root hubs */
221
222static const u8 fs_rh_config_descriptor [] = {
223
224 /* one configuration */
225 0x09, /* __u8 bLength; */
226 0x02, /* __u8 bDescriptorType; Configuration */
227 0x19, 0x00, /* __le16 wTotalLength; */
228 0x01, /* __u8 bNumInterfaces; (1) */
229 0x01, /* __u8 bConfigurationValue; */
230 0x00, /* __u8 iConfiguration; */
231 0xc0, /* __u8 bmAttributes;
232 Bit 7: must be set,
233 6: Self-powered,
234 5: Remote wakeup,
235 4..0: resvd */
236 0x00, /* __u8 MaxPower; */
237
238 /* USB 1.1:
239 * USB 2.0, single TT organization (mandatory):
240 * one interface, protocol 0
241 *
242 * USB 2.0, multiple TT organization (optional):
243 * two interfaces, protocols 1 (like single TT)
244 * and 2 (multiple TT mode) ... config is
245 * sometimes settable
246 * NOT IMPLEMENTED
247 */
248
249 /* one interface */
250 0x09, /* __u8 if_bLength; */
251 0x04, /* __u8 if_bDescriptorType; Interface */
252 0x00, /* __u8 if_bInterfaceNumber; */
253 0x00, /* __u8 if_bAlternateSetting; */
254 0x01, /* __u8 if_bNumEndpoints; */
255 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
256 0x00, /* __u8 if_bInterfaceSubClass; */
257 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
258 0x00, /* __u8 if_iInterface; */
259
260 /* one endpoint (status change endpoint) */
261 0x07, /* __u8 ep_bLength; */
262 0x05, /* __u8 ep_bDescriptorType; Endpoint */
263 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
264 0x03, /* __u8 ep_bmAttributes; Interrupt */
265 0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */
266 0xff /* __u8 ep_bInterval; (255ms -- usb 2.0 spec) */
267};
268
269static const u8 hs_rh_config_descriptor [] = {
270
271 /* one configuration */
272 0x09, /* __u8 bLength; */
273 0x02, /* __u8 bDescriptorType; Configuration */
274 0x19, 0x00, /* __le16 wTotalLength; */
275 0x01, /* __u8 bNumInterfaces; (1) */
276 0x01, /* __u8 bConfigurationValue; */
277 0x00, /* __u8 iConfiguration; */
278 0xc0, /* __u8 bmAttributes;
279 Bit 7: must be set,
280 6: Self-powered,
281 5: Remote wakeup,
282 4..0: resvd */
283 0x00, /* __u8 MaxPower; */
284
285 /* USB 1.1:
286 * USB 2.0, single TT organization (mandatory):
287 * one interface, protocol 0
288 *
289 * USB 2.0, multiple TT organization (optional):
290 * two interfaces, protocols 1 (like single TT)
291 * and 2 (multiple TT mode) ... config is
292 * sometimes settable
293 * NOT IMPLEMENTED
294 */
295
296 /* one interface */
297 0x09, /* __u8 if_bLength; */
298 0x04, /* __u8 if_bDescriptorType; Interface */
299 0x00, /* __u8 if_bInterfaceNumber; */
300 0x00, /* __u8 if_bAlternateSetting; */
301 0x01, /* __u8 if_bNumEndpoints; */
302 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
303 0x00, /* __u8 if_bInterfaceSubClass; */
304 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
305 0x00, /* __u8 if_iInterface; */
306
307 /* one endpoint (status change endpoint) */
308 0x07, /* __u8 ep_bLength; */
309 0x05, /* __u8 ep_bDescriptorType; Endpoint */
310 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
311 0x03, /* __u8 ep_bmAttributes; Interrupt */
88fafff9 312 /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
313 * see hub.c:hub_configure() for details. */
314 (USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
1da177e4
LT		 315 0x0c /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
316};
317
d2e9b4d6
SS		 318static const u8 ss_rh_config_descriptor[] = {
319 /* one configuration */
320 0x09, /* __u8 bLength; */
321 0x02, /* __u8 bDescriptorType; Configuration */
22c6a35d 322 0x1f, 0x00, /* __le16 wTotalLength; */
d2e9b4d6
SS		 323 0x01, /* __u8 bNumInterfaces; (1) */
324 0x01, /* __u8 bConfigurationValue; */
325 0x00, /* __u8 iConfiguration; */
326 0xc0, /* __u8 bmAttributes;
327 Bit 7: must be set,
328 6: Self-powered,
329 5: Remote wakeup,
330 4..0: resvd */
331 0x00, /* __u8 MaxPower; */
332
333 /* one interface */
334 0x09, /* __u8 if_bLength; */
335 0x04, /* __u8 if_bDescriptorType; Interface */
336 0x00, /* __u8 if_bInterfaceNumber; */
337 0x00, /* __u8 if_bAlternateSetting; */
338 0x01, /* __u8 if_bNumEndpoints; */
339 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
340 0x00, /* __u8 if_bInterfaceSubClass; */
341 0x00, /* __u8 if_bInterfaceProtocol; */
342 0x00, /* __u8 if_iInterface; */
343
344 /* one endpoint (status change endpoint) */
345 0x07, /* __u8 ep_bLength; */
346 0x05, /* __u8 ep_bDescriptorType; Endpoint */
347 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
348 0x03, /* __u8 ep_bmAttributes; Interrupt */
349 /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
350 * see hub.c:hub_configure() for details. */
351 (USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
22c6a35d
SS		 352 0x0c, /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
353
354 /* one SuperSpeed endpoint companion descriptor */
355 0x06, /* __u8 ss_bLength */
356 0x30, /* __u8 ss_bDescriptorType; SuperSpeed EP Companion */
357 0x00, /* __u8 ss_bMaxBurst; allows 1 TX between ACKs */
358 0x00, /* __u8 ss_bmAttributes; 1 packet per service interval */
359 0x02, 0x00 /* __le16 ss_wBytesPerInterval; 15 bits for max 15 ports */
d2e9b4d6
SS		 360};
361
c4fc2342
CDH		 362/* authorized_default behaviour:
363 * -1 is authorized for all devices except wireless (old behaviour)
364 * 0 is unauthorized for all devices
365 * 1 is authorized for all devices
366 */
367static int authorized_default = -1;
368module_param(authorized_default, int, S_IRUGO|S_IWUSR);
369MODULE_PARM_DESC(authorized_default,
370 "Default USB device authorization: 0 is not authorized, 1 is "
371 "authorized, -1 is authorized except for wireless USB (default, "
372 "old behaviour");
1da177e4
LT		 373/*-------------------------------------------------------------------------*/
374
392ca68b
GS		 375/**
376 * ascii2desc() - Helper routine for producing UTF-16LE string descriptors
377 * @s: Null-terminated ASCII (actually ISO-8859-1) string
378 * @buf: Buffer for USB string descriptor (header + UTF-16LE)
379 * @len: Length (in bytes; may be odd) of descriptor buffer.
380 *
626f090c
YB		 381 * Return: The number of bytes filled in: 2 + 2*strlen(s) or @len,
382 * whichever is less.
392ca68b 383 *
626f090c 384 * Note:
392ca68b
GS		 385 * USB String descriptors can contain at most 126 characters; input
386 * strings longer than that are truncated.
1da177e4 387 */
392ca68b
GS		 388static unsigned
389ascii2desc(char const *s, u8 *buf, unsigned len)
1da177e4 390{
392ca68b
GS		 391 unsigned n, t = 2 + 2*strlen(s);
392
393 if (t > 254)
394 t = 254; /* Longest possible UTF string descriptor */
395 if (len > t)
396 len = t;
397
398 t += USB_DT_STRING << 8; /* Now t is first 16 bits to store */
399
400 n = len;
401 while (n--) {
402 *buf++ = t;
403 if (!n--)
404 break;
405 *buf++ = t >> 8;
406 t = (unsigned char)*s++;
1da177e4 407 }
392ca68b 408 return len;
1da177e4
LT		 409}
410
392ca68b
GS		 411/**
412 * rh_string() - provides string descriptors for root hub
413 * @id: the string ID number (0: langids, 1: serial #, 2: product, 3: vendor)
1da177e4 414 * @hcd: the host controller for this root hub
392ca68b
GS		 415 * @data: buffer for output packet
416 * @len: length of the provided buffer
1da177e4
LT		 417 *
418 * Produces either a manufacturer, product or serial number string for the
419 * virtual root hub device.
626f090c
YB		 420 *
421 * Return: The number of bytes filled in: the length of the descriptor or
392ca68b 422 * of the provided buffer, whichever is less.
1da177e4 423 */
392ca68b
GS		 424static unsigned
425rh_string(int id, struct usb_hcd const *hcd, u8 *data, unsigned len)
71d2718f 426{
392ca68b
GS		 427 char buf[100];
428 char const *s;
429 static char const langids[4] = {4, USB_DT_STRING, 0x09, 0x04};
1da177e4
LT		 430
431 // language ids
392ca68b
GS		 432 switch (id) {
433 case 0:
434 /* Array of LANGID codes (0x0409 is MSFT-speak for "en-us") */
435 /* See http://www.usb.org/developers/docs/USB_LANGIDs.pdf */
436 if (len > 4)
437 len = 4;
438 memcpy(data, langids, len);
1da177e4 439 return len;
392ca68b
GS		 440 case 1:
441 /* Serial number */
442 s = hcd->self.bus_name;
443 break;
444 case 2:
445 /* Product name */
446 s = hcd->product_desc;
447 break;
448 case 3:
449 /* Manufacturer */
96b644bd
SH		 450 snprintf (buf, sizeof buf, "%s %s %s", init_utsname()->sysname,
451 init_utsname()->release, hcd->driver->description);
392ca68b
GS		 452 s = buf;
453 break;
1da177e4 454 default:
392ca68b
GS		 455 /* Can't happen; caller guarantees it */
456 return 0;
1da177e4 457 }
392ca68b
GS		 458
459 return ascii2desc(s, data, len);
1da177e4
LT		 460}
461
462
463/* Root hub control transfers execute synchronously */
464static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
465{
466 struct usb_ctrlrequest *cmd;
467 u16 typeReq, wValue, wIndex, wLength;
468 u8 *ubuf = urb->transfer_buffer;
71d2718f 469 unsigned len = 0;
e9df41c5 470 int status;
7329e211
AS		 471 u8 patch_wakeup = 0;
472 u8 patch_protocol = 0;
e57e780b
SS		 473 u16 tbuf_size;
474 u8 *tbuf = NULL;
475 const u8 *bufp;
1da177e4 476
9439eb94
AS		 477 might_sleep();
478
e9df41c5
AS		 479 spin_lock_irq(&hcd_root_hub_lock);
480 status = usb_hcd_link_urb_to_ep(hcd, urb);
481 spin_unlock_irq(&hcd_root_hub_lock);
482 if (status)
483 return status;
b0d9efba 484 urb->hcpriv = hcd; /* Indicate it's queued */
e9df41c5 485
1da177e4
LT		 486 cmd = (struct usb_ctrlrequest *) urb->setup_packet;
487 typeReq = (cmd->bRequestType << 8) | cmd->bRequest;
488 wValue = le16_to_cpu (cmd->wValue);
489 wIndex = le16_to_cpu (cmd->wIndex);
490 wLength = le16_to_cpu (cmd->wLength);
491
492 if (wLength > urb->transfer_buffer_length)
493 goto error;
494
e57e780b
SS		 495 /*
496 * tbuf should be at least as big as the
497 * USB hub descriptor.
498 */
499 tbuf_size = max_t(u16, sizeof(struct usb_hub_descriptor), wLength);
500 tbuf = kzalloc(tbuf_size, GFP_KERNEL);
501 if (!tbuf)
502 return -ENOMEM;
503
504 bufp = tbuf;
505
506
1da177e4
LT		 507 urb->actual_length = 0;
508 switch (typeReq) {
509
510 /* DEVICE REQUESTS */
511
fb669cc0
DB		 512 /* The root hub's remote wakeup enable bit is implemented using
513 * driver model wakeup flags. If this system supports wakeup
514 * through USB, userspace may change the default "allow wakeup"
515 * policy through sysfs or these calls.
516 *
517 * Most root hubs support wakeup from downstream devices, for
518 * runtime power management (disabling USB clocks and reducing
519 * VBUS power usage). However, not all of them do so; silicon,
520 * board, and BIOS bugs here are not uncommon, so these can't
521 * be treated quite like external hubs.
522 *
523 * Likewise, not all root hubs will pass wakeup events upstream,
524 * to wake up the whole system. So don't assume root hub and
525 * controller capabilities are identical.
526 */
527
1da177e4 528 case DeviceRequest | USB_REQ_GET_STATUS:
fb669cc0
DB		 529 tbuf [0] = (device_may_wakeup(&hcd->self.root_hub->dev)
530 << USB_DEVICE_REMOTE_WAKEUP)
1da177e4
LT		 531 | (1 << USB_DEVICE_SELF_POWERED);
532 tbuf [1] = 0;
533 len = 2;
534 break;
535 case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
536 if (wValue == USB_DEVICE_REMOTE_WAKEUP)
fb669cc0 537 device_set_wakeup_enable(&hcd->self.root_hub->dev, 0);
1da177e4
LT		 538 else
539 goto error;
540 break;
541 case DeviceOutRequest | USB_REQ_SET_FEATURE:
fb669cc0
DB		 542 if (device_can_wakeup(&hcd->self.root_hub->dev)
543 && wValue == USB_DEVICE_REMOTE_WAKEUP)
544 device_set_wakeup_enable(&hcd->self.root_hub->dev, 1);
1da177e4
LT		 545 else
546 goto error;
547 break;
548 case DeviceRequest | USB_REQ_GET_CONFIGURATION:
549 tbuf [0] = 1;
550 len = 1;
551 /* FALLTHROUGH */
552 case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
553 break;
554 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
555 switch (wValue & 0xff00) {
556 case USB_DT_DEVICE << 8:
83de4b2b 557 switch (hcd->speed) {
7dd19e69 558 case HCD_USB3:
d2e9b4d6 559 bufp = usb3_rh_dev_descriptor;
7dd19e69 560 break;
1a81f881
TP		 561 case HCD_USB25:
562 bufp = usb25_rh_dev_descriptor;
563 break;
7dd19e69 564 case HCD_USB2:
1da177e4 565 bufp = usb2_rh_dev_descriptor;
7dd19e69
VM		 566 break;
567 case HCD_USB11:
1da177e4 568 bufp = usb11_rh_dev_descriptor;
7dd19e69
VM		 569 break;
570 default:
1da177e4 571 goto error;
7dd19e69 572 }
1da177e4 573 len = 18;
7329e211
AS		 574 if (hcd->has_tt)
575 patch_protocol = 1;
1da177e4
LT		 576 break;
577 case USB_DT_CONFIG << 8:
83de4b2b 578 switch (hcd->speed) {
7dd19e69 579 case HCD_USB3:
d2e9b4d6
SS		 580 bufp = ss_rh_config_descriptor;
581 len = sizeof ss_rh_config_descriptor;
7dd19e69 582 break;
1a81f881 583 case HCD_USB25:
7dd19e69 584 case HCD_USB2:
1da177e4
LT		 585 bufp = hs_rh_config_descriptor;
586 len = sizeof hs_rh_config_descriptor;
7dd19e69
VM		 587 break;
588 case HCD_USB11:
1da177e4
LT		 589 bufp = fs_rh_config_descriptor;
590 len = sizeof fs_rh_config_descriptor;
7dd19e69
VM		 591 break;
592 default:
593 goto error;
1da177e4 594 }
fb669cc0 595 if (device_can_wakeup(&hcd->self.root_hub->dev))
1da177e4
LT		 596 patch_wakeup = 1;
597 break;
598 case USB_DT_STRING << 8:
71d2718f
RK		 599 if ((wValue & 0xff) < 4)
600 urb->actual_length = rh_string(wValue & 0xff,
601 hcd, ubuf, wLength);
602 else /* unsupported IDs --> "protocol stall" */
1da177e4 603 goto error;
1da177e4 604 break;
48e82361
SS		 605 case USB_DT_BOS << 8:
606 goto nongeneric;
1da177e4
LT		 607 default:
608 goto error;
609 }
610 break;
611 case DeviceRequest | USB_REQ_GET_INTERFACE:
612 tbuf [0] = 0;
613 len = 1;
614 /* FALLTHROUGH */
615 case DeviceOutRequest | USB_REQ_SET_INTERFACE:
616 break;
617 case DeviceOutRequest | USB_REQ_SET_ADDRESS:
618 // wValue == urb->dev->devaddr
619 dev_dbg (hcd->self.controller, "root hub device address %d\n",
620 wValue);
621 break;
622
623 /* INTERFACE REQUESTS (no defined feature/status flags) */
624
625 /* ENDPOINT REQUESTS */
626
627 case EndpointRequest | USB_REQ_GET_STATUS:
628 // ENDPOINT_HALT flag
629 tbuf [0] = 0;
630 tbuf [1] = 0;
631 len = 2;
632 /* FALLTHROUGH */
633 case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
634 case EndpointOutRequest | USB_REQ_SET_FEATURE:
635 dev_dbg (hcd->self.controller, "no endpoint features yet\n");
636 break;
637
638 /* CLASS REQUESTS (and errors) */
639
640 default:
48e82361 641nongeneric:
1da177e4 642 /* non-generic request */
b13296c6
DB		 643 switch (typeReq) {
644 case GetHubStatus:
645 case GetPortStatus:
646 len = 4;
647 break;
648 case GetHubDescriptor:
649 len = sizeof (struct usb_hub_descriptor);
650 break;
48e82361
SS		 651 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
652 /* len is returned by hub_control */
653 break;
1da177e4 654 }
b13296c6
DB		 655 status = hcd->driver->hub_control (hcd,
656 typeReq, wValue, wIndex,
657 tbuf, wLength);
d2123fd9
LT		 658
659 if (typeReq == GetHubDescriptor)
660 usb_hub_adjust_deviceremovable(hcd->self.root_hub,
661 (struct usb_hub_descriptor *)tbuf);
1da177e4
LT		 662 break;
663error:
664 /* "protocol stall" on error */
665 status = -EPIPE;
666 }
667
48e82361 668 if (status < 0) {
1da177e4
LT		 669 len = 0;
670 if (status != -EPIPE) {
671 dev_dbg (hcd->self.controller,
672 "CTRL: TypeReq=0x%x val=0x%x "
673 "idx=0x%x len=%d ==> %d\n",
674 typeReq, wValue, wIndex,
b13296c6 675 wLength, status);
1da177e4 676 }
48e82361
SS		 677 } else if (status > 0) {
678 /* hub_control may return the length of data copied. */
679 len = status;
680 status = 0;
1da177e4
LT		 681 }
682 if (len) {
683 if (urb->transfer_buffer_length < len)
684 len = urb->transfer_buffer_length;
685 urb->actual_length = len;
686 // always USB_DIR_IN, toward host
687 memcpy (ubuf, bufp, len);
688
689 /* report whether RH hardware supports remote wakeup */
690 if (patch_wakeup &&
691 len > offsetof (struct usb_config_descriptor,
692 bmAttributes))
693 ((struct usb_config_descriptor *)ubuf)->bmAttributes
694 |= USB_CONFIG_ATT_WAKEUP;
7329e211
AS		 695
696 /* report whether RH hardware has an integrated TT */
697 if (patch_protocol &&
698 len > offsetof(struct usb_device_descriptor,
699 bDeviceProtocol))
700 ((struct usb_device_descriptor *) ubuf)->
7bf01185 701 bDeviceProtocol = USB_HUB_PR_HS_SINGLE_TT;
1da177e4
LT		 702 }
703
e57e780b
SS		 704 kfree(tbuf);
705
1da177e4 706 /* any errors get returned through the urb completion */
9439eb94 707 spin_lock_irq(&hcd_root_hub_lock);
e9df41c5 708 usb_hcd_unlink_urb_from_ep(hcd, urb);
4a00027d 709 usb_hcd_giveback_urb(hcd, urb, status);
9439eb94 710 spin_unlock_irq(&hcd_root_hub_lock);
1da177e4
LT		 711 return 0;
712}
713
714/*-------------------------------------------------------------------------*/
715
716/*
d5926ae7
AS		 717 * Root Hub interrupt transfers are polled using a timer if the
718 * driver requests it; otherwise the driver is responsible for
719 * calling usb_hcd_poll_rh_status() when an event occurs.
1da177e4 720 *
d5926ae7
AS		 721 * Completions are called in_interrupt(), but they may or may not
722 * be in_irq().
1da177e4 723 */
d5926ae7
AS		 724void usb_hcd_poll_rh_status(struct usb_hcd *hcd)
725{
726 struct urb *urb;
727 int length;
728 unsigned long flags;
ad361c98 729 char buffer[6]; /* Any root hubs with > 31 ports? */
1da177e4 730
6d88e679 731 if (unlikely(!hcd->rh_pollable))
1b42ae6d 732 return;
d5926ae7
AS		 733 if (!hcd->uses_new_polling && !hcd->status_urb)
734 return;
1da177e4 735
d5926ae7
AS		 736 length = hcd->driver->hub_status_data(hcd, buffer);
737 if (length > 0) {
1da177e4 738
d5926ae7 739 /* try to complete the status urb */
9439eb94 740 spin_lock_irqsave(&hcd_root_hub_lock, flags);
d5926ae7
AS		 741 urb = hcd->status_urb;
742 if (urb) {
541c7d43 743 clear_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
e9df41c5 744 hcd->status_urb = NULL;
e9df41c5
AS		 745 urb->actual_length = length;
746 memcpy(urb->transfer_buffer, buffer, length);
9439eb94 747
e9df41c5 748 usb_hcd_unlink_urb_from_ep(hcd, urb);
4a00027d 749 usb_hcd_giveback_urb(hcd, urb, 0);
e9df41c5 750 } else {
d5926ae7 751 length = 0;
541c7d43 752 set_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
e9df41c5 753 }
9439eb94 754 spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
1da177e4
LT		 755 }
756
d5926ae7 757 /* The USB 2.0 spec says 256 ms. This is close enough and won't
01cd0819
AV		 758 * exceed that limit if HZ is 100. The math is more clunky than
759 * maybe expected, this is to make sure that all timers for USB devices
25985edc 760 * fire at the same time to give the CPU a break in between */
541c7d43 761 if (hcd->uses_new_polling ? HCD_POLL_RH(hcd) :
d5926ae7 762 (length == 0 && hcd->status_urb != NULL))
01cd0819 763 mod_timer (&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));
1da177e4 764}
d5926ae7 765EXPORT_SYMBOL_GPL(usb_hcd_poll_rh_status);
1da177e4
LT		 766
767/* timer callback */
d5926ae7
AS		 768static void rh_timer_func (unsigned long _hcd)
769{
770 usb_hcd_poll_rh_status((struct usb_hcd *) _hcd);
771}
772
773/*-------------------------------------------------------------------------*/
1da177e4 774
d5926ae7 775static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb)
1da177e4 776{
d5926ae7 777 int retval;
1da177e4 778 unsigned long flags;
71d2718f 779 unsigned len = 1 + (urb->dev->maxchild / 8);
1da177e4 780
d5926ae7 781 spin_lock_irqsave (&hcd_root_hub_lock, flags);
e9df41c5 782 if (hcd->status_urb || urb->transfer_buffer_length < len) {
d5926ae7
AS		 783 dev_dbg (hcd->self.controller, "not queuing rh status urb\n");
784 retval = -EINVAL;
e9df41c5
AS		 785 goto done;
786 }
1da177e4 787
e9df41c5
AS		 788 retval = usb_hcd_link_urb_to_ep(hcd, urb);
789 if (retval)
790 goto done;
1da177e4 791
e9df41c5
AS		 792 hcd->status_urb = urb;
793 urb->hcpriv = hcd; /* indicate it's queued */
794 if (!hcd->uses_new_polling)
795 mod_timer(&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));
796
797 /* If a status change has already occurred, report it ASAP */
541c7d43 798 else if (HCD_POLL_PENDING(hcd))
e9df41c5
AS		 799 mod_timer(&hcd->rh_timer, jiffies);
800 retval = 0;
801 done:
d5926ae7
AS		 802 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
803 return retval;
1da177e4
LT		 804}
805
1da177e4
LT		 806static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb)
807{
5e60a161 808 if (usb_endpoint_xfer_int(&urb->ep->desc))
d5926ae7 809 return rh_queue_status (hcd, urb);
5e60a161 810 if (usb_endpoint_xfer_control(&urb->ep->desc))
1da177e4 811 return rh_call_control (hcd, urb);
d5926ae7 812 return -EINVAL;
1da177e4
LT		 813}
814
815/*-------------------------------------------------------------------------*/
816
455b25fb
AS		 817/* Unlinks of root-hub control URBs are legal, but they don't do anything
818 * since these URBs always execute synchronously.
d5926ae7 819 */
e9df41c5 820static int usb_rh_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1da177e4 821{
455b25fb 822 unsigned long flags;
e9df41c5 823 int rc;
1da177e4 824
9439eb94 825 spin_lock_irqsave(&hcd_root_hub_lock, flags);
e9df41c5
AS		 826 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
827 if (rc)
828 goto done;
829
5e60a161 830 if (usb_endpoint_num(&urb->ep->desc) == 0) { /* Control URB */
455b25fb 831 ; /* Do nothing */
d5926ae7
AS		 832
833 } else { /* Status URB */
834 if (!hcd->uses_new_polling)
455b25fb 835 del_timer (&hcd->rh_timer);
d5926ae7
AS		 836 if (urb == hcd->status_urb) {
837 hcd->status_urb = NULL;
e9df41c5 838 usb_hcd_unlink_urb_from_ep(hcd, urb);
4a00027d 839 usb_hcd_giveback_urb(hcd, urb, status);
9439eb94
AS		 840 }
841 }
e9df41c5 842 done:
9439eb94 843 spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
e9df41c5 844 return rc;
1da177e4
LT		 845}
846
5234ce1b
IPG		 847
848
849/*
850 * Show & store the current value of authorized_default
851 */
d03f254f
GKH		 852static ssize_t authorized_default_show(struct device *dev,
853 struct device_attribute *attr, char *buf)
5234ce1b
IPG		 854{
855 struct usb_device *rh_usb_dev = to_usb_device(dev);
856 struct usb_bus *usb_bus = rh_usb_dev->bus;
857 struct usb_hcd *usb_hcd;
858
859 if (usb_bus == NULL) /* FIXME: not sure if this case is possible */
860 return -ENODEV;
861 usb_hcd = bus_to_hcd(usb_bus);
862 return snprintf(buf, PAGE_SIZE, "%u\n", usb_hcd->authorized_default);
863}
864
d03f254f
GKH		 865static ssize_t authorized_default_store(struct device *dev,
866 struct device_attribute *attr,
867 const char *buf, size_t size)
5234ce1b
IPG		 868{
869 ssize_t result;
870 unsigned val;
871 struct usb_device *rh_usb_dev = to_usb_device(dev);
872 struct usb_bus *usb_bus = rh_usb_dev->bus;
873 struct usb_hcd *usb_hcd;
874
875 if (usb_bus == NULL) /* FIXME: not sure if this case is possible */
876 return -ENODEV;
877 usb_hcd = bus_to_hcd(usb_bus);
878 result = sscanf(buf, "%u\n", &val);
879 if (result == 1) {
880 usb_hcd->authorized_default = val? 1 : 0;
881 result = size;
882 }
883 else
884 result = -EINVAL;
885 return result;
886}
d03f254f 887static DEVICE_ATTR_RW(authorized_default);
5234ce1b
IPG		 888
889/* Group all the USB bus attributes */
890static struct attribute *usb_bus_attrs[] = {
891 &dev_attr_authorized_default.attr,
892 NULL,
893};
894
895static struct attribute_group usb_bus_attr_group = {
896 .name = NULL, /* we want them in the same directory */
897 .attrs = usb_bus_attrs,
898};
899
900
901
1da177e4
LT		 902/*-------------------------------------------------------------------------*/
903
1da177e4
LT		 904/**
905 * usb_bus_init - shared initialization code
906 * @bus: the bus structure being initialized
907 *
908 * This code is used to initialize a usb_bus structure, memory for which is
909 * separately managed.
910 */
911static void usb_bus_init (struct usb_bus *bus)
912{
913 memset (&bus->devmap, 0, sizeof(struct usb_devmap));
914
915 bus->devnum_next = 1;
916
917 bus->root_hub = NULL;
1da177e4
LT		 918 bus->busnum = -1;
919 bus->bandwidth_allocated = 0;
920 bus->bandwidth_int_reqs = 0;
921 bus->bandwidth_isoc_reqs = 0;
922
923 INIT_LIST_HEAD (&bus->bus_list);
1da177e4
LT		 924}
925
1da177e4
LT		 926/*-------------------------------------------------------------------------*/
927
928/**
929 * usb_register_bus - registers the USB host controller with the usb core
930 * @bus: pointer to the bus to register
931 * Context: !in_interrupt()
932 *
933 * Assigns a bus number, and links the controller into usbcore data
934 * structures so that it can be seen by scanning the bus list.
626f090c
YB		 935 *
936 * Return: 0 if successful. A negative error code otherwise.
1da177e4
LT		 937 */
938static int usb_register_bus(struct usb_bus *bus)
939{
eb579f58 940 int result = -E2BIG;
1da177e4 941 int busnum;
1da177e4 942
4186ecf8 943 mutex_lock(&usb_bus_list_lock);
1da177e4 944 busnum = find_next_zero_bit (busmap.busmap, USB_MAXBUS, 1);
eb579f58 945 if (busnum >= USB_MAXBUS) {
1da177e4 946 printk (KERN_ERR "%s: too many buses\n", usbcore_name);
eb579f58 947 goto error_find_busnum;
1da177e4 948 }
eb579f58
IPG		 949 set_bit (busnum, busmap.busmap);
950 bus->busnum = busnum;
5a3201b2 951
1da177e4
LT		 952 /* Add it to the local list of buses */
953 list_add (&bus->bus_list, &usb_bus_list);
4186ecf8 954 mutex_unlock(&usb_bus_list_lock);
1da177e4 955
3099e75a 956 usb_notify_add_bus(bus);
1da177e4 957
eb579f58
IPG		 958 dev_info (bus->controller, "new USB bus registered, assigned bus "
959 "number %d\n", bus->busnum);
1da177e4 960 return 0;
eb579f58 961
eb579f58
IPG		 962error_find_busnum:
963 mutex_unlock(&usb_bus_list_lock);
964 return result;
1da177e4
LT		 965}
966
967/**
968 * usb_deregister_bus - deregisters the USB host controller
969 * @bus: pointer to the bus to deregister
970 * Context: !in_interrupt()
971 *
972 * Recycles the bus number, and unlinks the controller from usbcore data
973 * structures so that it won't be seen by scanning the bus list.
974 */
975static void usb_deregister_bus (struct usb_bus *bus)
976{
977 dev_info (bus->controller, "USB bus %d deregistered\n", bus->busnum);
978
979 /*
980 * NOTE: make sure that all the devices are removed by the
981 * controller code, as well as having it call this when cleaning
982 * itself up
983 */
4186ecf8 984 mutex_lock(&usb_bus_list_lock);
1da177e4 985 list_del (&bus->bus_list);
4186ecf8 986 mutex_unlock(&usb_bus_list_lock);
1da177e4 987
3099e75a 988 usb_notify_remove_bus(bus);
1da177e4
LT		 989
990 clear_bit (bus->busnum, busmap.busmap);
1da177e4
LT		 991}
992
993/**
8ec8d20b 994 * register_root_hub - called by usb_add_hcd() to register a root hub
1da177e4
LT		 995 * @hcd: host controller for this root hub
996 *
8ec8d20b 997 * This function registers the root hub with the USB subsystem. It sets up
b1e8f0a6
DB		 998 * the device properly in the device tree and then calls usb_new_device()
999 * to register the usb device. It also assigns the root hub's USB address
1000 * (always 1).
626f090c
YB		 1001 *
1002 * Return: 0 if successful. A negative error code otherwise.
1da177e4 1003 */
b1e8f0a6 1004static int register_root_hub(struct usb_hcd *hcd)
1da177e4
LT		 1005{
1006 struct device *parent_dev = hcd->self.controller;
b1e8f0a6 1007 struct usb_device *usb_dev = hcd->self.root_hub;
1da177e4
LT		 1008 const int devnum = 1;
1009 int retval;
1010
1da177e4
LT		 1011 usb_dev->devnum = devnum;
1012 usb_dev->bus->devnum_next = devnum + 1;
1013 memset (&usb_dev->bus->devmap.devicemap, 0,
1014 sizeof usb_dev->bus->devmap.devicemap);
1015 set_bit (devnum, usb_dev->bus->devmap.devicemap);
1016 usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
1017
4186ecf8 1018 mutex_lock(&usb_bus_list_lock);
1da177e4 1019
551509d2 1020 usb_dev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
1da177e4
LT		 1021 retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE);
1022 if (retval != sizeof usb_dev->descriptor) {
4186ecf8 1023 mutex_unlock(&usb_bus_list_lock);
1da177e4 1024 dev_dbg (parent_dev, "can't read %s device descriptor %d\n",
7071a3ce 1025 dev_name(&usb_dev->dev), retval);
1da177e4
LT		 1026 return (retval < 0) ? retval : -EMSGSIZE;
1027 }
448b6eb1
SS		 1028 if (usb_dev->speed == USB_SPEED_SUPER) {
1029 retval = usb_get_bos_descriptor(usb_dev);
1030 if (retval < 0) {
1031 mutex_unlock(&usb_bus_list_lock);
1032 dev_dbg(parent_dev, "can't read %s bos descriptor %d\n",
1033 dev_name(&usb_dev->dev), retval);
1034 return retval;
1035 }
1036 }
1da177e4 1037
1da177e4 1038 retval = usb_new_device (usb_dev);
1da177e4 1039 if (retval) {
1da177e4 1040 dev_err (parent_dev, "can't register root hub for %s, %d\n",
7071a3ce 1041 dev_name(&usb_dev->dev), retval);
0a231403 1042 } else {
1da177e4
LT		 1043 spin_lock_irq (&hcd_root_hub_lock);
1044 hcd->rh_registered = 1;
1045 spin_unlock_irq (&hcd_root_hub_lock);
1046
1047 /* Did the HC die before the root hub was registered? */
69fff59d 1048 if (HCD_DEAD(hcd))
1da177e4
LT		 1049 usb_hc_died (hcd); /* This time clean up */
1050 }
0a231403 1051 mutex_unlock(&usb_bus_list_lock);
1da177e4
LT		 1052
1053 return retval;
1054}
1da177e4 1055
da0aa716
AS		 1056/*
1057 * usb_hcd_start_port_resume - a root-hub port is sending a resume signal
1058 * @bus: the bus which the root hub belongs to
1059 * @portnum: the port which is being resumed
1060 *
1061 * HCDs should call this function when they know that a resume signal is
1062 * being sent to a root-hub port. The root hub will be prevented from
1063 * going into autosuspend until usb_hcd_end_port_resume() is called.
1064 *
1065 * The bus's private lock must be held by the caller.
1066 */
1067void usb_hcd_start_port_resume(struct usb_bus *bus, int portnum)
1068{
1069 unsigned bit = 1 << portnum;
1070
1071 if (!(bus->resuming_ports & bit)) {
1072 bus->resuming_ports |= bit;
1073 pm_runtime_get_noresume(&bus->root_hub->dev);
1074 }
1075}
1076EXPORT_SYMBOL_GPL(usb_hcd_start_port_resume);
1077
1078/*
1079 * usb_hcd_end_port_resume - a root-hub port has stopped sending a resume signal
1080 * @bus: the bus which the root hub belongs to
1081 * @portnum: the port which is being resumed
1082 *
1083 * HCDs should call this function when they know that a resume signal has
1084 * stopped being sent to a root-hub port. The root hub will be allowed to
1085 * autosuspend again.
1086 *
1087 * The bus's private lock must be held by the caller.
1088 */
1089void usb_hcd_end_port_resume(struct usb_bus *bus, int portnum)
1090{
1091 unsigned bit = 1 << portnum;
1092
1093 if (bus->resuming_ports & bit) {
1094 bus->resuming_ports &= ~bit;
1095 pm_runtime_put_noidle(&bus->root_hub->dev);
1096 }
1097}
1098EXPORT_SYMBOL_GPL(usb_hcd_end_port_resume);
1da177e4
LT		 1099
1100/*-------------------------------------------------------------------------*/
1101
1102/**
1103 * usb_calc_bus_time - approximate periodic transaction time in nanoseconds
1104 * @speed: from dev->speed; USB_SPEED_{LOW,FULL,HIGH}
1105 * @is_input: true iff the transaction sends data to the host
1106 * @isoc: true for isochronous transactions, false for interrupt ones
1107 * @bytecount: how many bytes in the transaction.
1108 *
626f090c
YB		 1109 * Return: Approximate bus time in nanoseconds for a periodic transaction.
1110 *
1111 * Note:
1da177e4
LT		 1112 * See USB 2.0 spec section 5.11.3; only periodic transfers need to be
1113 * scheduled in software, this function is only used for such scheduling.
1114 */
1115long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount)
1116{
1117 unsigned long tmp;
1118
1119 switch (speed) {
1120 case USB_SPEED_LOW: /* INTR only */
1121 if (is_input) {
1122 tmp = (67667L * (31L + 10L * BitTime (bytecount))) / 1000L;
1123 return (64060L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
1124 } else {
1125 tmp = (66700L * (31L + 10L * BitTime (bytecount))) / 1000L;
1126 return (64107L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
1127 }
1128 case USB_SPEED_FULL: /* ISOC or INTR */
1129 if (isoc) {
1130 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
1131 return (((is_input) ? 7268L : 6265L) + BW_HOST_DELAY + tmp);
1132 } else {
1133 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
1134 return (9107L + BW_HOST_DELAY + tmp);
1135 }
1136 case USB_SPEED_HIGH: /* ISOC or INTR */
1137 // FIXME adjust for input vs output
1138 if (isoc)
498f78e6 1139 tmp = HS_NSECS_ISO (bytecount);
1da177e4 1140 else
498f78e6 1141 tmp = HS_NSECS (bytecount);
1da177e4
LT		 1142 return tmp;
1143 default:
1144 pr_debug ("%s: bogus device speed!\n", usbcore_name);
1145 return -1;
1146 }
1147}
782e70c6 1148EXPORT_SYMBOL_GPL(usb_calc_bus_time);
1da177e4 1149
1da177e4
LT		 1150
1151/*-------------------------------------------------------------------------*/
1152
1153/*
1154 * Generic HC operations.
1155 */
1156
1157/*-------------------------------------------------------------------------*/
1158
e9df41c5
AS		 1159/**
1160 * usb_hcd_link_urb_to_ep - add an URB to its endpoint queue
1161 * @hcd: host controller to which @urb was submitted
1162 * @urb: URB being submitted
1163 *
1164 * Host controller drivers should call this routine in their enqueue()
1165 * method. The HCD's private spinlock must be held and interrupts must
1166 * be disabled. The actions carried out here are required for URB
1167 * submission, as well as for endpoint shutdown and for usb_kill_urb.
1168 *
626f090c 1169 * Return: 0 for no error, otherwise a negative error code (in which case
e9df41c5
AS		 1170 * the enqueue() method must fail). If no error occurs but enqueue() fails
1171 * anyway, it must call usb_hcd_unlink_urb_from_ep() before releasing
1172 * the private spinlock and returning.
1173 */
1174int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb)
1da177e4 1175{
9a9bf406 1176 int rc = 0;
1da177e4 1177
e9df41c5 1178 spin_lock(&hcd_urb_list_lock);
1da177e4 1179
9a9bf406 1180 /* Check that the URB isn't being killed */
49367d8f 1181 if (unlikely(atomic_read(&urb->reject))) {
9a9bf406
AS		 1182 rc = -EPERM;
1183 goto done;
9f6a93f7 1184 }
1da177e4 1185
9a9bf406
AS		 1186 if (unlikely(!urb->ep->enabled)) {
1187 rc = -ENOENT;
1188 goto done;
1189 }
1da177e4 1190
6840d255
AS		 1191 if (unlikely(!urb->dev->can_submit)) {
1192 rc = -EHOSTUNREACH;
1193 goto done;
1194 }
1195
1da177e4 1196 /*
9a9bf406
AS		 1197 * Check the host controller's state and add the URB to the
1198 * endpoint's queue.
1da177e4 1199 */
9b37596a 1200 if (HCD_RH_RUNNING(hcd)) {
eb231054 1201 urb->unlinked = 0;
9a9bf406 1202 list_add_tail(&urb->urb_list, &urb->ep->urb_list);
9b37596a 1203 } else {
9a9bf406
AS		 1204 rc = -ESHUTDOWN;
1205 goto done;
1da177e4 1206 }
9a9bf406 1207 done:
e9df41c5 1208 spin_unlock(&hcd_urb_list_lock);
9a9bf406
AS		 1209 return rc;
1210}
e9df41c5 1211EXPORT_SYMBOL_GPL(usb_hcd_link_urb_to_ep);
9a9bf406 1212
e9df41c5
AS		 1213/**
1214 * usb_hcd_check_unlink_urb - check whether an URB may be unlinked
1215 * @hcd: host controller to which @urb was submitted
1216 * @urb: URB being checked for unlinkability
1217 * @status: error code to store in @urb if the unlink succeeds
1218 *
1219 * Host controller drivers should call this routine in their dequeue()
1220 * method. The HCD's private spinlock must be held and interrupts must
1221 * be disabled. The actions carried out here are required for making
1222 * sure than an unlink is valid.
1223 *
626f090c 1224 * Return: 0 for no error, otherwise a negative error code (in which case
e9df41c5
AS		 1225 * the dequeue() method must fail). The possible error codes are:
1226 *
1227 * -EIDRM: @urb was not submitted or has already completed.
1228 * The completion function may not have been called yet.
1229 *
1230 * -EBUSY: @urb has already been unlinked.
1231 */
1232int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
9a9bf406
AS		 1233 int status)
1234{
9a9bf406 1235 struct list_head *tmp;
9a9bf406
AS		 1236
1237 /* insist the urb is still queued */
1238 list_for_each(tmp, &urb->ep->urb_list) {
1239 if (tmp == &urb->urb_list)
1240 break;
1241 }
e9df41c5
AS		 1242 if (tmp != &urb->urb_list)
1243 return -EIDRM;
1da177e4 1244
9a9bf406
AS		 1245 /* Any status except -EINPROGRESS means something already started to
1246 * unlink this URB from the hardware. So there's no more work to do.
1da177e4 1247 */
eb231054 1248 if (urb->unlinked)
e9df41c5 1249 return -EBUSY;
eb231054 1250 urb->unlinked = status;
e9df41c5 1251 return 0;
9a9bf406 1252}
e9df41c5 1253EXPORT_SYMBOL_GPL(usb_hcd_check_unlink_urb);
9a9bf406 1254
e9df41c5
AS		 1255/**
1256 * usb_hcd_unlink_urb_from_ep - remove an URB from its endpoint queue
1257 * @hcd: host controller to which @urb was submitted
1258 * @urb: URB being unlinked
1259 *
1260 * Host controller drivers should call this routine before calling
1261 * usb_hcd_giveback_urb(). The HCD's private spinlock must be held and
1262 * interrupts must be disabled. The actions carried out here are required
1263 * for URB completion.
1264 */
1265void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb)
9a9bf406 1266{
9a9bf406 1267 /* clear all state linking urb to this dev (and hcd) */
e9df41c5 1268 spin_lock(&hcd_urb_list_lock);
9a9bf406 1269 list_del_init(&urb->urb_list);
e9df41c5 1270 spin_unlock(&hcd_urb_list_lock);
9a9bf406 1271}
e9df41c5 1272EXPORT_SYMBOL_GPL(usb_hcd_unlink_urb_from_ep);
9a9bf406 1273
b3476675
MD		 1274/*
1275 * Some usb host controllers can only perform dma using a small SRAM area.
1276 * The usb core itself is however optimized for host controllers that can dma
1277 * using regular system memory - like pci devices doing bus mastering.
1278 *
1279 * To support host controllers with limited dma capabilites we provide dma
1280 * bounce buffers. This feature can be enabled using the HCD_LOCAL_MEM flag.
1281 * For this to work properly the host controller code must first use the
1282 * function dma_declare_coherent_memory() to point out which memory area
1283 * that should be used for dma allocations.
1284 *
1285 * The HCD_LOCAL_MEM flag then tells the usb code to allocate all data for
1286 * dma using dma_alloc_coherent() which in turn allocates from the memory
1287 * area pointed out with dma_declare_coherent_memory().
1288 *
1289 * So, to summarize...
1290 *
1291 * - We need "local" memory, canonical example being
1292 * a small SRAM on a discrete controller being the
1293 * only memory that the controller can read ...
1294 * (a) "normal" kernel memory is no good, and
1295 * (b) there's not enough to share
1296 *
1297 * - The only *portable* hook for such stuff in the
1298 * DMA framework is dma_declare_coherent_memory()
1299 *
1300 * - So we use that, even though the primary requirement
1301 * is that the memory be "local" (hence addressible
1302 * by that device), not "coherent".
1303 *
1304 */
1305
1306static int hcd_alloc_coherent(struct usb_bus *bus,
1307 gfp_t mem_flags, dma_addr_t *dma_handle,
1308 void **vaddr_handle, size_t size,
1309 enum dma_data_direction dir)
1310{
1311 unsigned char *vaddr;
1312
4307a28e
AR		 1313 if (*vaddr_handle == NULL) {
1314 WARN_ON_ONCE(1);
1315 return -EFAULT;
1316 }
1317
b3476675
MD		 1318 vaddr = hcd_buffer_alloc(bus, size + sizeof(vaddr),
1319 mem_flags, dma_handle);
1320 if (!vaddr)
1321 return -ENOMEM;
1322
1323 /*
1324 * Store the virtual address of the buffer at the end
1325 * of the allocated dma buffer. The size of the buffer
1326 * may be uneven so use unaligned functions instead
1327 * of just rounding up. It makes sense to optimize for
1328 * memory footprint over access speed since the amount
1329 * of memory available for dma may be limited.
1330 */
1331 put_unaligned((unsigned long)*vaddr_handle,
1332 (unsigned long *)(vaddr + size));
1333
1334 if (dir == DMA_TO_DEVICE)
1335 memcpy(vaddr, *vaddr_handle, size);
1336
1337 *vaddr_handle = vaddr;
1338 return 0;
1339}
1340
1341static void hcd_free_coherent(struct usb_bus *bus, dma_addr_t *dma_handle,
1342 void **vaddr_handle, size_t size,
1343 enum dma_data_direction dir)
1344{
1345 unsigned char *vaddr = *vaddr_handle;
1346
1347 vaddr = (void *)get_unaligned((unsigned long *)(vaddr + size));
1348
1349 if (dir == DMA_FROM_DEVICE)
1350 memcpy(vaddr, *vaddr_handle, size);
1351
1352 hcd_buffer_free(bus, size + sizeof(vaddr), *vaddr_handle, *dma_handle);
1353
1354 *vaddr_handle = vaddr;
1355 *dma_handle = 0;
1356}
1357
c8cf203a 1358void usb_hcd_unmap_urb_setup_for_dma(struct usb_hcd *hcd, struct urb *urb)
ff9c895f 1359{
ff9c895f
AS		 1360 if (urb->transfer_flags & URB_SETUP_MAP_SINGLE)
1361 dma_unmap_single(hcd->self.controller,
1362 urb->setup_dma,
1363 sizeof(struct usb_ctrlrequest),
1364 DMA_TO_DEVICE);
1365 else if (urb->transfer_flags & URB_SETUP_MAP_LOCAL)
1366 hcd_free_coherent(urb->dev->bus,
1367 &urb->setup_dma,
1368 (void **) &urb->setup_packet,
1369 sizeof(struct usb_ctrlrequest),
1370 DMA_TO_DEVICE);
1371
1dae423d
MF		 1372 /* Make it safe to call this routine more than once */
1373 urb->transfer_flags &= ~(URB_SETUP_MAP_SINGLE | URB_SETUP_MAP_LOCAL);
1374}
c8cf203a 1375EXPORT_SYMBOL_GPL(usb_hcd_unmap_urb_setup_for_dma);
1dae423d 1376
2694a48d
RM		 1377static void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
1378{
1379 if (hcd->driver->unmap_urb_for_dma)
1380 hcd->driver->unmap_urb_for_dma(hcd, urb);
1381 else
1382 usb_hcd_unmap_urb_for_dma(hcd, urb);
1383}
1384
c8cf203a 1385void usb_hcd_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
1dae423d
MF		 1386{
1387 enum dma_data_direction dir;
1388
c8cf203a 1389 usb_hcd_unmap_urb_setup_for_dma(hcd, urb);
1dae423d 1390
ff9c895f
AS		 1391 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
1392 if (urb->transfer_flags & URB_DMA_MAP_SG)
1393 dma_unmap_sg(hcd->self.controller,
910f8d0c 1394 urb->sg,
ff9c895f
AS		 1395 urb->num_sgs,
1396 dir);
1397 else if (urb->transfer_flags & URB_DMA_MAP_PAGE)
1398 dma_unmap_page(hcd->self.controller,
1399 urb->transfer_dma,
1400 urb->transfer_buffer_length,
1401 dir);
1402 else if (urb->transfer_flags & URB_DMA_MAP_SINGLE)
1403 dma_unmap_single(hcd->self.controller,
1404 urb->transfer_dma,
1405 urb->transfer_buffer_length,
1406 dir);
1407 else if (urb->transfer_flags & URB_MAP_LOCAL)
1408 hcd_free_coherent(urb->dev->bus,
1409 &urb->transfer_dma,
1410 &urb->transfer_buffer,
1411 urb->transfer_buffer_length,
1412 dir);
1413
1414 /* Make it safe to call this routine more than once */
1dae423d 1415 urb->transfer_flags &= ~(URB_DMA_MAP_SG | URB_DMA_MAP_PAGE |
ff9c895f
AS		 1416 URB_DMA_MAP_SINGLE | URB_MAP_LOCAL);
1417}
c8cf203a 1418EXPORT_SYMBOL_GPL(usb_hcd_unmap_urb_for_dma);
ff9c895f 1419
b3476675
MD		 1420static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
1421 gfp_t mem_flags)
2694a48d
RM		 1422{
1423 if (hcd->driver->map_urb_for_dma)
1424 return hcd->driver->map_urb_for_dma(hcd, urb, mem_flags);
1425 else
1426 return usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
1427}
1428
1429int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
1430 gfp_t mem_flags)
9a9bf406 1431{
b3476675
MD		 1432 enum dma_data_direction dir;
1433 int ret = 0;
1434
9a9bf406
AS		 1435 /* Map the URB's buffers for DMA access.
1436 * Lower level HCD code should use *_dma exclusively,
e04748e3
SS		 1437 * unless it uses pio or talks to another transport,
1438 * or uses the provided scatter gather list for bulk.
1da177e4 1439 */
b3476675 1440
85bcb5ee 1441 if (usb_endpoint_xfer_control(&urb->ep->desc)) {
07a8cdd2
AG		 1442 if (hcd->self.uses_pio_for_control)
1443 return ret;
85e034fd 1444 if (hcd->self.uses_dma) {
b3476675 1445 urb->setup_dma = dma_map_single(
1da177e4
LT		 1446 hcd->self.controller,
1447 urb->setup_packet,
b3476675 1448 sizeof(struct usb_ctrlrequest),
1da177e4 1449 DMA_TO_DEVICE);
85e034fd
LF		 1450 if (dma_mapping_error(hcd->self.controller,
1451 urb->setup_dma))
1452 return -EAGAIN;
ff9c895f 1453 urb->transfer_flags |= URB_SETUP_MAP_SINGLE;
f537da68 1454 } else if (hcd->driver->flags & HCD_LOCAL_MEM) {
b3476675
MD		 1455 ret = hcd_alloc_coherent(
1456 urb->dev->bus, mem_flags,
1457 &urb->setup_dma,
1458 (void **)&urb->setup_packet,
1459 sizeof(struct usb_ctrlrequest),
1460 DMA_TO_DEVICE);
ff9c895f
AS		 1461 if (ret)
1462 return ret;
1463 urb->transfer_flags |= URB_SETUP_MAP_LOCAL;
f537da68 1464 }
b3476675
MD		 1465 }
1466
1467 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
ff9c895f 1468 if (urb->transfer_buffer_length != 0
b3476675 1469 && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) {
85e034fd 1470 if (hcd->self.uses_dma) {
ff9c895f 1471 if (urb->num_sgs) {
fe2072cc
HG		 1472 int n;
1473
1474 /* We don't support sg for isoc transfers ! */
1475 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1476 WARN_ON(1);
1477 return -EINVAL;
1478 }
1479
1480 n = dma_map_sg(
ff9c895f 1481 hcd->self.controller,
910f8d0c 1482 urb->sg,
ff9c895f
AS		 1483 urb->num_sgs,
1484 dir);
1485 if (n <= 0)
1486 ret = -EAGAIN;
1487 else
1488 urb->transfer_flags |= URB_DMA_MAP_SG;
bc677d5b
CL		 1489 urb->num_mapped_sgs = n;
1490 if (n != urb->num_sgs)
ff9c895f
AS		 1491 urb->transfer_flags |=
1492 URB_DMA_SG_COMBINED;
ff9c895f 1493 } else if (urb->sg) {
910f8d0c 1494 struct scatterlist *sg = urb->sg;
ff9c895f
AS		 1495 urb->transfer_dma = dma_map_page(
1496 hcd->self.controller,
1497 sg_page(sg),
1498 sg->offset,
1499 urb->transfer_buffer_length,
1500 dir);
1501 if (dma_mapping_error(hcd->self.controller,
85e034fd 1502 urb->transfer_dma))
ff9c895f
AS		 1503 ret = -EAGAIN;
1504 else
1505 urb->transfer_flags |= URB_DMA_MAP_PAGE;
1506 } else {
1507 urb->transfer_dma = dma_map_single(
1508 hcd->self.controller,
1509 urb->transfer_buffer,
1510 urb->transfer_buffer_length,
1511 dir);
1512 if (dma_mapping_error(hcd->self.controller,
1513 urb->transfer_dma))
1514 ret = -EAGAIN;
1515 else
1516 urb->transfer_flags |= URB_DMA_MAP_SINGLE;
1517 }
85e034fd 1518 } else if (hcd->driver->flags & HCD_LOCAL_MEM) {
b3476675
MD		 1519 ret = hcd_alloc_coherent(
1520 urb->dev->bus, mem_flags,
1521 &urb->transfer_dma,
1522 &urb->transfer_buffer,
1523 urb->transfer_buffer_length,
1524 dir);
ff9c895f
AS		 1525 if (ret == 0)
1526 urb->transfer_flags |= URB_MAP_LOCAL;
b3476675 1527 }
ff9c895f
AS		 1528 if (ret && (urb->transfer_flags & (URB_SETUP_MAP_SINGLE |
1529 URB_SETUP_MAP_LOCAL)))
c8cf203a 1530 usb_hcd_unmap_urb_for_dma(hcd, urb);
1da177e4 1531 }
b3476675 1532 return ret;
9a9bf406 1533}
2694a48d 1534EXPORT_SYMBOL_GPL(usb_hcd_map_urb_for_dma);
1da177e4 1535
9a9bf406
AS		 1536/*-------------------------------------------------------------------------*/
1537
1538/* may be called in any context with a valid urb->dev usecount
1539 * caller surrenders "ownership" of urb
1540 * expects usb_submit_urb() to have sanity checked and conditioned all
1541 * inputs in the urb
1542 */
1543int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
1544{
1545 int status;
1546 struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus);
1547
1548 /* increment urb's reference count as part of giving it to the HCD
1549 * (which will control it). HCD guarantees that it either returns
1550 * an error or calls giveback(), but not both.
1551 */
1552 usb_get_urb(urb);
1553 atomic_inc(&urb->use_count);
4d59d8a1 1554 atomic_inc(&urb->dev->urbnum);
9a9bf406
AS		 1555 usbmon_urb_submit(&hcd->self, urb);
1556
1557 /* NOTE requirements on root-hub callers (usbfs and the hub
1558 * driver, for now): URBs' urb->transfer_buffer must be
1559 * valid and usb_buffer_{sync,unmap}() not be needed, since
1560 * they could clobber root hub response data. Also, control
1561 * URBs must be submitted in process context with interrupts
1562 * enabled.
1563 */
b3476675 1564
ff9c895f 1565 if (is_root_hub(urb->dev)) {
e9df41c5 1566 status = rh_urb_enqueue(hcd, urb);
ff9c895f
AS		 1567 } else {
1568 status = map_urb_for_dma(hcd, urb, mem_flags);
1569 if (likely(status == 0)) {
1570 status = hcd->driver->urb_enqueue(hcd, urb, mem_flags);
1571 if (unlikely(status))
2694a48d 1572 unmap_urb_for_dma(hcd, urb);
ff9c895f
AS		 1573 }
1574 }
9a9bf406
AS		 1575
1576 if (unlikely(status)) {
1da177e4 1577 usbmon_urb_submit_error(&hcd->self, urb, status);
b0d9efba 1578 urb->hcpriv = NULL;
9a9bf406
AS		 1579 INIT_LIST_HEAD(&urb->urb_list);
1580 atomic_dec(&urb->use_count);
4d59d8a1 1581 atomic_dec(&urb->dev->urbnum);
49367d8f 1582 if (atomic_read(&urb->reject))
9a9bf406
AS		 1583 wake_up(&usb_kill_urb_queue);
1584 usb_put_urb(urb);
1da177e4
LT		 1585 }
1586 return status;
1587}
1588
1589/*-------------------------------------------------------------------------*/
1590
1da177e4
LT		 1591/* this makes the hcd giveback() the urb more quickly, by kicking it
1592 * off hardware queues (which may take a while) and returning it as
1593 * soon as practical. we've already set up the urb's return status,
1594 * but we can't know if the callback completed already.
1595 */
e9df41c5 1596static int unlink1(struct usb_hcd *hcd, struct urb *urb, int status)
1da177e4
LT		 1597{
1598 int value;
1599
809a58b8 1600 if (is_root_hub(urb->dev))
e9df41c5 1601 value = usb_rh_urb_dequeue(hcd, urb, status);
1da177e4
LT		 1602 else {
1603
1604 /* The only reason an HCD might fail this call is if
1605 * it has not yet fully queued the urb to begin with.
1606 * Such failures should be harmless. */
e9df41c5 1607 value = hcd->driver->urb_dequeue(hcd, urb, status);
1da177e4 1608 }
1da177e4
LT		 1609 return value;
1610}
1611
1612/*
1613 * called in any context
1614 *
1615 * caller guarantees urb won't be recycled till both unlink()
1616 * and the urb's completion function return
1617 */
a6d2bb9f 1618int usb_hcd_unlink_urb (struct urb *urb, int status)
1da177e4 1619{
9a9bf406 1620 struct usb_hcd *hcd;
cde217a5
AS		 1621 int retval = -EIDRM;
1622 unsigned long flags;
1da177e4 1623
cde217a5
AS		 1624 /* Prevent the device and bus from going away while
1625 * the unlink is carried out. If they are already gone
1626 * then urb->use_count must be 0, since disconnected
1627 * devices can't have any active URBs.
1628 */
1629 spin_lock_irqsave(&hcd_urb_unlink_lock, flags);
1630 if (atomic_read(&urb->use_count) > 0) {
1631 retval = 0;
1632 usb_get_dev(urb->dev);
1633 }
1634 spin_unlock_irqrestore(&hcd_urb_unlink_lock, flags);
1635 if (retval == 0) {
1636 hcd = bus_to_hcd(urb->dev->bus);
1637 retval = unlink1(hcd, urb, status);
1638 usb_put_dev(urb->dev);
1639 }
1da177e4 1640
1da177e4
LT		 1641 if (retval == 0)
1642 retval = -EINPROGRESS;
e9df41c5 1643 else if (retval != -EIDRM && retval != -EBUSY)
9a9bf406
AS		 1644 dev_dbg(&urb->dev->dev, "hcd_unlink_urb %p fail %d\n",
1645 urb, retval);
1da177e4
LT		 1646 return retval;
1647}
1648
1649/*-------------------------------------------------------------------------*/
1650
94dfd7ed
ML		 1651static void __usb_hcd_giveback_urb(struct urb *urb)
1652{
1653 struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus);
1654 int status = urb->unlinked;
1655 unsigned long flags;
1656
1657 urb->hcpriv = NULL;
1658 if (unlikely((urb->transfer_flags & URB_SHORT_NOT_OK) &&
1659 urb->actual_length < urb->transfer_buffer_length &&
1660 !status))
1661 status = -EREMOTEIO;
1662
1663 unmap_urb_for_dma(hcd, urb);
1664 usbmon_urb_complete(&hcd->self, urb, status);
1665 usb_unanchor_urb(urb);
1666
1667 /* pass ownership to the completion handler */
1668 urb->status = status;
1669
1670 /*
1671 * We disable local IRQs here avoid possible deadlock because
1672 * drivers may call spin_lock() to hold lock which might be
1673 * acquired in one hard interrupt handler.
1674 *
1675 * The local_irq_save()/local_irq_restore() around complete()
1676 * will be removed if current USB drivers have been cleaned up
1677 * and no one may trigger the above deadlock situation when
1678 * running complete() in tasklet.
1679 */
1680 local_irq_save(flags);
1681 urb->complete(urb);
1682 local_irq_restore(flags);
1683
1684 atomic_dec(&urb->use_count);
1685 if (unlikely(atomic_read(&urb->reject)))
1686 wake_up(&usb_kill_urb_queue);
1687 usb_put_urb(urb);
1688}
1689
1690static void usb_giveback_urb_bh(unsigned long param)
1691{
1692 struct giveback_urb_bh *bh = (struct giveback_urb_bh *)param;
1693 struct list_head local_list;
1694
1695 spin_lock_irq(&bh->lock);
1696 bh->running = true;
1697 restart:
1698 list_replace_init(&bh->head, &local_list);
1699 spin_unlock_irq(&bh->lock);
1700
1701 while (!list_empty(&local_list)) {
1702 struct urb *urb;
1703
1704 urb = list_entry(local_list.next, struct urb, urb_list);
1705 list_del_init(&urb->urb_list);
c7ccde6e 1706 bh->completing_ep = urb->ep;
94dfd7ed 1707 __usb_hcd_giveback_urb(urb);
c7ccde6e 1708 bh->completing_ep = NULL;
94dfd7ed
ML		 1709 }
1710
1711 /* check if there are new URBs to giveback */
1712 spin_lock_irq(&bh->lock);
1713 if (!list_empty(&bh->head))
1714 goto restart;
1715 bh->running = false;
1716 spin_unlock_irq(&bh->lock);
1717}
1718
32aca560
AS		 1719/**
1720 * usb_hcd_giveback_urb - return URB from HCD to device driver
1721 * @hcd: host controller returning the URB
1722 * @urb: urb being returned to the USB device driver.
4a00027d 1723 * @status: completion status code for the URB.
32aca560
AS		 1724 * Context: in_interrupt()
1725 *
1726 * This hands the URB from HCD to its USB device driver, using its
1727 * completion function. The HCD has freed all per-urb resources
1728 * (and is done using urb->hcpriv). It also released all HCD locks;
1729 * the device driver won't cause problems if it frees, modifies,
1730 * or resubmits this URB.
eb231054 1731 *
4a00027d 1732 * If @urb was unlinked, the value of @status will be overridden by
eb231054
AS		 1733 * @urb->unlinked. Erroneous short transfers are detected in case
1734 * the HCD hasn't checked for them.
32aca560 1735 */
4a00027d 1736void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb, int status)
32aca560 1737{
94dfd7ed
ML		 1738 struct giveback_urb_bh *bh;
1739 bool running, high_prio_bh;
32aca560 1740
94dfd7ed
ML		 1741 /* pass status to tasklet via unlinked */
1742 if (likely(!urb->unlinked))
1743 urb->unlinked = status;
1f5a3d0f 1744
94dfd7ed
ML		 1745 if (!hcd_giveback_urb_in_bh(hcd) && !is_root_hub(urb->dev)) {
1746 __usb_hcd_giveback_urb(urb);
1747 return;
1748 }
1749
1750 if (usb_pipeisoc(urb->pipe) || usb_pipeint(urb->pipe)) {
1751 bh = &hcd->high_prio_bh;
1752 high_prio_bh = true;
1753 } else {
1754 bh = &hcd->low_prio_bh;
1755 high_prio_bh = false;
1756 }
1757
1758 spin_lock(&bh->lock);
1759 list_add_tail(&urb->urb_list, &bh->head);
1760 running = bh->running;
1761 spin_unlock(&bh->lock);
1762
1763 if (running)
1764 ;
1765 else if (high_prio_bh)
1766 tasklet_hi_schedule(&bh->bh);
1767 else
1768 tasklet_schedule(&bh->bh);
32aca560 1769}
782e70c6 1770EXPORT_SYMBOL_GPL(usb_hcd_giveback_urb);
32aca560
AS		 1771
1772/*-------------------------------------------------------------------------*/
1773
95cf82f9
AS		 1774/* Cancel all URBs pending on this endpoint and wait for the endpoint's
1775 * queue to drain completely. The caller must first insure that no more
1776 * URBs can be submitted for this endpoint.
1da177e4 1777 */
95cf82f9 1778void usb_hcd_flush_endpoint(struct usb_device *udev,
a6d2bb9f 1779 struct usb_host_endpoint *ep)
1da177e4
LT		 1780{
1781 struct usb_hcd *hcd;
1782 struct urb *urb;
1783
95cf82f9
AS		 1784 if (!ep)
1785 return;
9a9bf406 1786 might_sleep();
17200583 1787 hcd = bus_to_hcd(udev->bus);
1da177e4 1788
95cf82f9 1789 /* No more submits can occur */
9a9bf406 1790 spin_lock_irq(&hcd_urb_list_lock);
ddc1fd6a 1791rescan:
1da177e4 1792 list_for_each_entry (urb, &ep->urb_list, urb_list) {
5e60a161 1793 int is_in;
1da177e4 1794
eb231054 1795 if (urb->unlinked)
1da177e4
LT		 1796 continue;
1797 usb_get_urb (urb);
5e60a161 1798 is_in = usb_urb_dir_in(urb);
809a58b8 1799 spin_unlock(&hcd_urb_list_lock);
1da177e4 1800
e9df41c5
AS		 1801 /* kick hcd */
1802 unlink1(hcd, urb, -ESHUTDOWN);
1803 dev_dbg (hcd->self.controller,
1804 "shutdown urb %p ep%d%s%s\n",
1805 urb, usb_endpoint_num(&ep->desc),
1806 is_in ? "in" : "out",
1807 ({ char *s;
1808
1809 switch (usb_endpoint_type(&ep->desc)) {
1810 case USB_ENDPOINT_XFER_CONTROL:
1811 s = ""; break;
1812 case USB_ENDPOINT_XFER_BULK:
1813 s = "-bulk"; break;
1814 case USB_ENDPOINT_XFER_INT:
1815 s = "-intr"; break;
1816 default:
1817 s = "-iso"; break;
1818 };
1819 s;
1820 }));
1da177e4
LT		 1821 usb_put_urb (urb);
1822
1823 /* list contents may have changed */
ddc1fd6a 1824 spin_lock(&hcd_urb_list_lock);
1da177e4
LT		 1825 goto rescan;
1826 }
9a9bf406 1827 spin_unlock_irq(&hcd_urb_list_lock);
1da177e4 1828
95cf82f9 1829 /* Wait until the endpoint queue is completely empty */
455b25fb 1830 while (!list_empty (&ep->urb_list)) {
809a58b8 1831 spin_lock_irq(&hcd_urb_list_lock);
455b25fb
AS		 1832
1833 /* The list may have changed while we acquired the spinlock */
1834 urb = NULL;
1835 if (!list_empty (&ep->urb_list)) {
1836 urb = list_entry (ep->urb_list.prev, struct urb,
1837 urb_list);
1838 usb_get_urb (urb);
1839 }
809a58b8 1840 spin_unlock_irq(&hcd_urb_list_lock);
455b25fb
AS		 1841
1842 if (urb) {
1843 usb_kill_urb (urb);
1844 usb_put_urb (urb);
1845 }
1846 }
1da177e4
LT		 1847}
1848
3f0479e0 1849/**
70445ae6
RD		 1850 * usb_hcd_alloc_bandwidth - check whether a new bandwidth setting exceeds
1851 * the bus bandwidth
1852 * @udev: target &usb_device
3f0479e0
SS		 1853 * @new_config: new configuration to install
1854 * @cur_alt: the current alternate interface setting
1855 * @new_alt: alternate interface setting that is being installed
1856 *
1857 * To change configurations, pass in the new configuration in new_config,
1858 * and pass NULL for cur_alt and new_alt.
1859 *
1860 * To reset a device's configuration (put the device in the ADDRESSED state),
1861 * pass in NULL for new_config, cur_alt, and new_alt.
1862 *
1863 * To change alternate interface settings, pass in NULL for new_config,
1864 * pass in the current alternate interface setting in cur_alt,
1865 * and pass in the new alternate interface setting in new_alt.
1866 *
626f090c 1867 * Return: An error if the requested bandwidth change exceeds the
3f0479e0 1868 * bus bandwidth or host controller internal resources.
79abb1ab 1869 */
3f0479e0 1870int usb_hcd_alloc_bandwidth(struct usb_device *udev,
79abb1ab 1871 struct usb_host_config *new_config,
3f0479e0
SS		 1872 struct usb_host_interface *cur_alt,
1873 struct usb_host_interface *new_alt)
79abb1ab
SS		 1874{
1875 int num_intfs, i, j;
576a362a 1876 struct usb_host_interface *alt = NULL;
79abb1ab
SS		 1877 int ret = 0;
1878 struct usb_hcd *hcd;
1879 struct usb_host_endpoint *ep;
1880
1881 hcd = bus_to_hcd(udev->bus);
1882 if (!hcd->driver->check_bandwidth)
1883 return 0;
1884
1885 /* Configuration is being removed - set configuration 0 */
3f0479e0 1886 if (!new_config && !cur_alt) {
79abb1ab
SS		 1887 for (i = 1; i < 16; ++i) {
1888 ep = udev->ep_out[i];
1889 if (ep)
1890 hcd->driver->drop_endpoint(hcd, udev, ep);
1891 ep = udev->ep_in[i];
1892 if (ep)
1893 hcd->driver->drop_endpoint(hcd, udev, ep);
1894 }
1895 hcd->driver->check_bandwidth(hcd, udev);
1896 return 0;
1897 }
1898 /* Check if the HCD says there's enough bandwidth. Enable all endpoints
1899 * each interface's alt setting 0 and ask the HCD to check the bandwidth
1900 * of the bus. There will always be bandwidth for endpoint 0, so it's
1901 * ok to exclude it.
1902 */
1903 if (new_config) {
1904 num_intfs = new_config->desc.bNumInterfaces;
1905 /* Remove endpoints (except endpoint 0, which is always on the
1906 * schedule) from the old config from the schedule
1907 */
1908 for (i = 1; i < 16; ++i) {
1909 ep = udev->ep_out[i];
1910 if (ep) {
1911 ret = hcd->driver->drop_endpoint(hcd, udev, ep);
1912 if (ret < 0)
1913 goto reset;
1914 }
1915 ep = udev->ep_in[i];
1916 if (ep) {
1917 ret = hcd->driver->drop_endpoint(hcd, udev, ep);
1918 if (ret < 0)
1919 goto reset;
1920 }
1921 }
1922 for (i = 0; i < num_intfs; ++i) {
d837e219
SS		 1923 struct usb_host_interface *first_alt;
1924 int iface_num;
1925
1926 first_alt = &new_config->intf_cache[i]->altsetting[0];
1927 iface_num = first_alt->desc.bInterfaceNumber;
91017f9c 1928 /* Set up endpoints for alternate interface setting 0 */
d837e219 1929 alt = usb_find_alt_setting(new_config, iface_num, 0);
3f0479e0
SS		 1930 if (!alt)
1931 /* No alt setting 0? Pick the first setting. */
d837e219 1932 alt = first_alt;
3f0479e0 1933
79abb1ab
SS		 1934 for (j = 0; j < alt->desc.bNumEndpoints; j++) {
1935 ret = hcd->driver->add_endpoint(hcd, udev, &alt->endpoint[j]);
1936 if (ret < 0)
1937 goto reset;
1938 }
1939 }
1940 }
3f0479e0 1941 if (cur_alt && new_alt) {
04a723ea
SS		 1942 struct usb_interface *iface = usb_ifnum_to_if(udev,
1943 cur_alt->desc.bInterfaceNumber);
1944
8a9af4fd
SS		 1945 if (!iface)
1946 return -EINVAL;
04a723ea
SS		 1947 if (iface->resetting_device) {
1948 /*
1949 * The USB core just reset the device, so the xHCI host
1950 * and the device will think alt setting 0 is installed.
1951 * However, the USB core will pass in the alternate
1952 * setting installed before the reset as cur_alt. Dig
1953 * out the alternate setting 0 structure, or the first
1954 * alternate setting if a broken device doesn't have alt
1955 * setting 0.
1956 */
1957 cur_alt = usb_altnum_to_altsetting(iface, 0);
1958 if (!cur_alt)
1959 cur_alt = &iface->altsetting[0];
1960 }
1961
3f0479e0
SS		 1962 /* Drop all the endpoints in the current alt setting */
1963 for (i = 0; i < cur_alt->desc.bNumEndpoints; i++) {
1964 ret = hcd->driver->drop_endpoint(hcd, udev,
1965 &cur_alt->endpoint[i]);
1966 if (ret < 0)
1967 goto reset;
1968 }
1969 /* Add all the endpoints in the new alt setting */
1970 for (i = 0; i < new_alt->desc.bNumEndpoints; i++) {
1971 ret = hcd->driver->add_endpoint(hcd, udev,
1972 &new_alt->endpoint[i]);
1973 if (ret < 0)
1974 goto reset;
1975 }
1976 }
79abb1ab
SS		 1977 ret = hcd->driver->check_bandwidth(hcd, udev);
1978reset:
1979 if (ret < 0)
1980 hcd->driver->reset_bandwidth(hcd, udev);
1981 return ret;
1982}
1983
95cf82f9
AS		 1984/* Disables the endpoint: synchronizes with the hcd to make sure all
1985 * endpoint state is gone from hardware. usb_hcd_flush_endpoint() must
1986 * have been called previously. Use for set_configuration, set_interface,
1987 * driver removal, physical disconnect.
1988 *
1989 * example: a qh stored in ep->hcpriv, holding state related to endpoint
1990 * type, maxpacket size, toggle, halt status, and scheduling.
1991 */
1992void usb_hcd_disable_endpoint(struct usb_device *udev,
1993 struct usb_host_endpoint *ep)
1994{
1995 struct usb_hcd *hcd;
1996
1997 might_sleep();
1998 hcd = bus_to_hcd(udev->bus);
1999 if (hcd->driver->endpoint_disable)
2000 hcd->driver->endpoint_disable(hcd, ep);
2001}
2002
3444b26a
DV		 2003/**
2004 * usb_hcd_reset_endpoint - reset host endpoint state
2005 * @udev: USB device.
2006 * @ep: the endpoint to reset.
2007 *
2008 * Resets any host endpoint state such as the toggle bit, sequence
2009 * number and current window.
2010 */
2011void usb_hcd_reset_endpoint(struct usb_device *udev,
2012 struct usb_host_endpoint *ep)
2013{
2014 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2015
2016 if (hcd->driver->endpoint_reset)
2017 hcd->driver->endpoint_reset(hcd, ep);
2018 else {
2019 int epnum = usb_endpoint_num(&ep->desc);
2020 int is_out = usb_endpoint_dir_out(&ep->desc);
2021 int is_control = usb_endpoint_xfer_control(&ep->desc);
2022
2023 usb_settoggle(udev, epnum, is_out, 0);
2024 if (is_control)
2025 usb_settoggle(udev, epnum, !is_out, 0);
2026 }
2027}
2028
eab1cafc
SS		 2029/**
2030 * usb_alloc_streams - allocate bulk endpoint stream IDs.
2031 * @interface: alternate setting that includes all endpoints.
2032 * @eps: array of endpoints that need streams.
2033 * @num_eps: number of endpoints in the array.
2034 * @num_streams: number of streams to allocate.
2035 * @mem_flags: flags hcd should use to allocate memory.
2036 *
626f090c 2037 * Sets up a group of bulk endpoints to have @num_streams stream IDs available.
eab1cafc
SS		 2038 * Drivers may queue multiple transfers to different stream IDs, which may
2039 * complete in a different order than they were queued.
626f090c
YB		 2040 *
2041 * Return: On success, the number of allocated streams. On failure, a negative
2042 * error code.
eab1cafc
SS		 2043 */
2044int usb_alloc_streams(struct usb_interface *interface,
2045 struct usb_host_endpoint **eps, unsigned int num_eps,
2046 unsigned int num_streams, gfp_t mem_flags)
2047{
2048 struct usb_hcd *hcd;
2049 struct usb_device *dev;
2050 int i;
2051
2052 dev = interface_to_usbdev(interface);
2053 hcd = bus_to_hcd(dev->bus);
2054 if (!hcd->driver->alloc_streams || !hcd->driver->free_streams)
2055 return -EINVAL;
2056 if (dev->speed != USB_SPEED_SUPER)
2057 return -EINVAL;
2058
2059 /* Streams only apply to bulk endpoints. */
2060 for (i = 0; i < num_eps; i++)
2061 if (!usb_endpoint_xfer_bulk(&eps[i]->desc))
2062 return -EINVAL;
2063
2064 return hcd->driver->alloc_streams(hcd, dev, eps, num_eps,
2065 num_streams, mem_flags);
2066}
2067EXPORT_SYMBOL_GPL(usb_alloc_streams);
2068
2069/**
2070 * usb_free_streams - free bulk endpoint stream IDs.
2071 * @interface: alternate setting that includes all endpoints.
2072 * @eps: array of endpoints to remove streams from.
2073 * @num_eps: number of endpoints in the array.
2074 * @mem_flags: flags hcd should use to allocate memory.
2075 *
2076 * Reverts a group of bulk endpoints back to not using stream IDs.
2077 * Can fail if we are given bad arguments, or HCD is broken.
6c74dada
HG		 2078 *
2079 * Return: On success, the number of allocated streams. On failure, a negative
2080 * error code.
eab1cafc 2081 */
6c74dada 2082int usb_free_streams(struct usb_interface *interface,
eab1cafc
SS		 2083 struct usb_host_endpoint **eps, unsigned int num_eps,
2084 gfp_t mem_flags)
2085{
2086 struct usb_hcd *hcd;
2087 struct usb_device *dev;
2088 int i;
2089
2090 dev = interface_to_usbdev(interface);
2091 hcd = bus_to_hcd(dev->bus);
2092 if (dev->speed != USB_SPEED_SUPER)
6c74dada 2093 return -EINVAL;
eab1cafc
SS		 2094
2095 /* Streams only apply to bulk endpoints. */
2096 for (i = 0; i < num_eps; i++)
b214f191 2097 if (!eps[i] || !usb_endpoint_xfer_bulk(&eps[i]->desc))
6c74dada 2098 return -EINVAL;
eab1cafc 2099
6c74dada 2100 return hcd->driver->free_streams(hcd, dev, eps, num_eps, mem_flags);
eab1cafc
SS		 2101}
2102EXPORT_SYMBOL_GPL(usb_free_streams);
2103
cde217a5
AS		 2104/* Protect against drivers that try to unlink URBs after the device
2105 * is gone, by waiting until all unlinks for @udev are finished.
2106 * Since we don't currently track URBs by device, simply wait until
2107 * nothing is running in the locked region of usb_hcd_unlink_urb().
2108 */
2109void usb_hcd_synchronize_unlinks(struct usb_device *udev)
2110{
2111 spin_lock_irq(&hcd_urb_unlink_lock);
2112 spin_unlock_irq(&hcd_urb_unlink_lock);
2113}
2114
1da177e4
LT		 2115/*-------------------------------------------------------------------------*/
2116
32aca560
AS		 2117/* called in any context */
2118int usb_hcd_get_frame_number (struct usb_device *udev)
2119{
2120 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2121
9b37596a 2122 if (!HCD_RH_RUNNING(hcd))
32aca560
AS		 2123 return -ESHUTDOWN;
2124 return hcd->driver->get_frame_number (hcd);
2125}
2126
2127/*-------------------------------------------------------------------------*/
2128
9293677a 2129#ifdef CONFIG_PM
1da177e4 2130
65bfd296 2131int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)
1da177e4 2132{
686314cf
AS		 2133 struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self);
2134 int status;
2135 int old_state = hcd->state;
1da177e4 2136
30b1a7a3
AS		 2137 dev_dbg(&rhdev->dev, "bus %ssuspend, wakeup %d\n",
2138 (PMSG_IS_AUTO(msg) ? "auto-" : ""),
2139 rhdev->do_remote_wakeup);
9b37596a
AS		 2140 if (HCD_DEAD(hcd)) {
2141 dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "suspend");
2142 return 0;
2143 }
2144
686314cf
AS		 2145 if (!hcd->driver->bus_suspend) {
2146 status = -ENOENT;
2147 } else {
9b37596a 2148 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
686314cf
AS		 2149 hcd->state = HC_STATE_QUIESCING;
2150 status = hcd->driver->bus_suspend(hcd);
2151 }
2152 if (status == 0) {
2153 usb_set_device_state(rhdev, USB_STATE_SUSPENDED);
9293677a 2154 hcd->state = HC_STATE_SUSPENDED;
879d38e6
AS		 2155
2156 /* Did we race with a root-hub wakeup event? */
2157 if (rhdev->do_remote_wakeup) {
2158 char buffer[6];
2159
2160 status = hcd->driver->hub_status_data(hcd, buffer);
2161 if (status != 0) {
2162 dev_dbg(&rhdev->dev, "suspend raced with wakeup event\n");
2163 hcd_bus_resume(rhdev, PMSG_AUTO_RESUME);
2164 status = -EBUSY;
2165 }
2166 }
686314cf 2167 } else {
9b37596a
AS		 2168 spin_lock_irq(&hcd_root_hub_lock);
2169 if (!HCD_DEAD(hcd)) {
2170 set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2171 hcd->state = old_state;
2172 }
2173 spin_unlock_irq(&hcd_root_hub_lock);
686314cf 2174 dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
9293677a 2175 "suspend", status);
686314cf 2176 }
9293677a 2177 return status;
1da177e4
LT		 2178}
2179
65bfd296 2180int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
1da177e4 2181{
686314cf
AS		 2182 struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self);
2183 int status;
cfa59dab 2184 int old_state = hcd->state;
1da177e4 2185
30b1a7a3
AS		 2186 dev_dbg(&rhdev->dev, "usb %sresume\n",
2187 (PMSG_IS_AUTO(msg) ? "auto-" : ""));
9b37596a
AS		 2188 if (HCD_DEAD(hcd)) {
2189 dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "resume");
2190 return 0;
2191 }
0c0382e3 2192 if (!hcd->driver->bus_resume)
9293677a 2193 return -ENOENT;
9b37596a 2194 if (HCD_RH_RUNNING(hcd))
979d5199 2195 return 0;
686314cf 2196
9293677a 2197 hcd->state = HC_STATE_RESUMING;
686314cf 2198 status = hcd->driver->bus_resume(hcd);
bf3d7d40 2199 clear_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
686314cf 2200 if (status == 0) {
bfd1e910
AS		 2201 struct usb_device *udev;
2202 int port1;
2203
9b37596a
AS		 2204 spin_lock_irq(&hcd_root_hub_lock);
2205 if (!HCD_DEAD(hcd)) {
2206 usb_set_device_state(rhdev, rhdev->actconfig
2207 ? USB_STATE_CONFIGURED
2208 : USB_STATE_ADDRESS);
2209 set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2210 hcd->state = HC_STATE_RUNNING;
2211 }
2212 spin_unlock_irq(&hcd_root_hub_lock);
bfd1e910
AS		 2213
2214 /*
2215 * Check whether any of the enabled ports on the root hub are
2216 * unsuspended. If they are then a TRSMRCY delay is needed
2217 * (this is what the USB-2 spec calls a "global resume").
2218 * Otherwise we can skip the delay.
2219 */
2220 usb_hub_for_each_child(rhdev, port1, udev) {
2221 if (udev->state != USB_STATE_NOTATTACHED &&
2222 !udev->port_is_suspended) {
2223 usleep_range(10000, 11000); /* TRSMRCY */
2224 break;
2225 }
2226 }
686314cf 2227 } else {
cfa59dab 2228 hcd->state = old_state;
686314cf 2229 dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
9293677a 2230 "resume", status);
cfa59dab
AS		 2231 if (status != -ESHUTDOWN)
2232 usb_hc_died(hcd);
9293677a
DB		 2233 }
2234 return status;
1da177e4
LT		 2235}
2236
9bbdf1e0
AS		 2237#endif /* CONFIG_PM */
2238
84ebc102 2239#ifdef CONFIG_PM_RUNTIME
9bbdf1e0 2240
6b157c9b
AS		 2241/* Workqueue routine for root-hub remote wakeup */
2242static void hcd_resume_work(struct work_struct *work)
2243{
2244 struct usb_hcd *hcd = container_of(work, struct usb_hcd, wakeup_work);
2245 struct usb_device *udev = hcd->self.root_hub;
2246
2247 usb_lock_device(udev);
0534d468 2248 usb_remote_wakeup(udev);
6b157c9b
AS		 2249 usb_unlock_device(udev);
2250}
2251
1da177e4
LT		 2252/**
2253 * usb_hcd_resume_root_hub - called by HCD to resume its root hub
2254 * @hcd: host controller for this root hub
2255 *
2256 * The USB host controller calls this function when its root hub is
2257 * suspended (with the remote wakeup feature enabled) and a remote
6b157c9b
AS		 2258 * wakeup request is received. The routine submits a workqueue request
2259 * to resume the root hub (that is, manage its downstream ports again).
1da177e4
LT		 2260 */
2261void usb_hcd_resume_root_hub (struct usb_hcd *hcd)
2262{
2263 unsigned long flags;
2264
2265 spin_lock_irqsave (&hcd_root_hub_lock, flags);
ff2f0787
AS		 2266 if (hcd->rh_registered) {
2267 set_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
9bbdf1e0 2268 queue_work(pm_wq, &hcd->wakeup_work);
ff2f0787 2269 }
1da177e4
LT		 2270 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
2271}
9293677a 2272EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub);
1da177e4 2273
84ebc102 2274#endif /* CONFIG_PM_RUNTIME */
1da177e4
LT		 2275
2276/*-------------------------------------------------------------------------*/
2277
2278#ifdef CONFIG_USB_OTG
2279
2280/**
2281 * usb_bus_start_enum - start immediate enumeration (for OTG)
2282 * @bus: the bus (must use hcd framework)
2283 * @port_num: 1-based number of port; usually bus->otg_port
2284 * Context: in_interrupt()
2285 *
2286 * Starts enumeration, with an immediate reset followed later by
2287 * khubd identifying and possibly configuring the device.
2288 * This is needed by OTG controller drivers, where it helps meet
2289 * HNP protocol timing requirements for starting a port reset.
626f090c
YB		 2290 *
2291 * Return: 0 if successful.
1da177e4
LT		 2292 */
2293int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num)
2294{
2295 struct usb_hcd *hcd;
2296 int status = -EOPNOTSUPP;
2297
2298 /* NOTE: since HNP can't start by grabbing the bus's address0_sem,
2299 * boards with root hubs hooked up to internal devices (instead of
2300 * just the OTG port) may need more attention to resetting...
2301 */
2302 hcd = container_of (bus, struct usb_hcd, self);
2303 if (port_num && hcd->driver->start_port_reset)
2304 status = hcd->driver->start_port_reset(hcd, port_num);
2305
2306 /* run khubd shortly after (first) root port reset finishes;
2307 * it may issue others, until at least 50 msecs have passed.
2308 */
2309 if (status == 0)
2310 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10));
2311 return status;
2312}
782e70c6 2313EXPORT_SYMBOL_GPL(usb_bus_start_enum);
1da177e4
LT		 2314
2315#endif
2316
2317/*-------------------------------------------------------------------------*/
2318
1da177e4
LT		 2319/**
2320 * usb_hcd_irq - hook IRQs to HCD framework (bus glue)
2321 * @irq: the IRQ being raised
2322 * @__hcd: pointer to the HCD whose IRQ is being signaled
1da177e4
LT		 2323 *
2324 * If the controller isn't HALTed, calls the driver's irq handler.
2325 * Checks whether the controller is now dead.
626f090c
YB		 2326 *
2327 * Return: %IRQ_HANDLED if the IRQ was handled. %IRQ_NONE otherwise.
1da177e4 2328 */
7d12e780 2329irqreturn_t usb_hcd_irq (int irq, void *__hcd)
1da177e4
LT		 2330{
2331 struct usb_hcd *hcd = __hcd;
e592c5d0 2332 unsigned long flags;
de85422b 2333 irqreturn_t rc;
1da177e4 2334
e592c5d0
GKH		 2335 /* IRQF_DISABLED doesn't work correctly with shared IRQs
2336 * when the first handler doesn't use it. So let's just
2337 * assume it's never used.
2338 */
2339 local_irq_save(flags);
2340
968b822c 2341 if (unlikely(HCD_DEAD(hcd) || !HCD_HW_ACCESSIBLE(hcd)))
de85422b 2342 rc = IRQ_NONE;
968b822c 2343 else if (hcd->driver->irq(hcd) == IRQ_NONE)
de85422b 2344 rc = IRQ_NONE;
968b822c 2345 else
de85422b 2346 rc = IRQ_HANDLED;
de85422b 2347
e592c5d0 2348 local_irq_restore(flags);
de85422b 2349 return rc;
1da177e4 2350}
43b86af8 2351EXPORT_SYMBOL_GPL(usb_hcd_irq);
1da177e4
LT		 2352
2353/*-------------------------------------------------------------------------*/
2354
2355/**
2356 * usb_hc_died - report abnormal shutdown of a host controller (bus glue)
2357 * @hcd: pointer to the HCD representing the controller
2358 *
2359 * This is called by bus glue to report a USB host controller that died
2360 * while operations may still have been pending. It's called automatically
c5635437
SS		 2361 * by the PCI glue, so only glue for non-PCI busses should need to call it.
2362 *
2363 * Only call this function with the primary HCD.
1da177e4
LT		 2364 */
2365void usb_hc_died (struct usb_hcd *hcd)
2366{
2367 unsigned long flags;
2368
2369 dev_err (hcd->self.controller, "HC died; cleaning up\n");
2370
2371 spin_lock_irqsave (&hcd_root_hub_lock, flags);
9b37596a
AS		 2372 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2373 set_bit(HCD_FLAG_DEAD, &hcd->flags);
1da177e4 2374 if (hcd->rh_registered) {
541c7d43 2375 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
1da177e4
LT		 2376
2377 /* make khubd clean up old urbs and devices */
2378 usb_set_device_state (hcd->self.root_hub,
2379 USB_STATE_NOTATTACHED);
2380 usb_kick_khubd (hcd->self.root_hub);
2381 }
c5635437
SS		 2382 if (usb_hcd_is_primary_hcd(hcd) && hcd->shared_hcd) {
2383 hcd = hcd->shared_hcd;
2384 if (hcd->rh_registered) {
2385 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2386
2387 /* make khubd clean up old urbs and devices */
2388 usb_set_device_state(hcd->self.root_hub,
2389 USB_STATE_NOTATTACHED);
2390 usb_kick_khubd(hcd->self.root_hub);
2391 }
2392 }
1da177e4 2393 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
c5635437 2394 /* Make sure that the other roothub is also deallocated. */
1da177e4
LT		 2395}
2396EXPORT_SYMBOL_GPL (usb_hc_died);
2397
2398/*-------------------------------------------------------------------------*/
2399
94dfd7ed
ML		 2400static void init_giveback_urb_bh(struct giveback_urb_bh *bh)
2401{
2402
2403 spin_lock_init(&bh->lock);
2404 INIT_LIST_HEAD(&bh->head);
2405 tasklet_init(&bh->bh, usb_giveback_urb_bh, (unsigned long)bh);
2406}
2407
1da177e4 2408/**
c5635437 2409 * usb_create_shared_hcd - create and initialize an HCD structure
1da177e4
LT		 2410 * @driver: HC driver that will use this hcd
2411 * @dev: device for this HC, stored in hcd->self.controller
2412 * @bus_name: value to store in hcd->self.bus_name
c5635437
SS		 2413 * @primary_hcd: a pointer to the usb_hcd structure that is sharing the
2414 * PCI device. Only allocate certain resources for the primary HCD
1da177e4
LT		 2415 * Context: !in_interrupt()
2416 *
2417 * Allocate a struct usb_hcd, with extra space at the end for the
2418 * HC driver's private data. Initialize the generic members of the
2419 * hcd structure.
2420 *
626f090c
YB		 2421 * Return: On success, a pointer to the created and initialized HCD structure.
2422 * On failure (e.g. if memory is unavailable), %NULL.
1da177e4 2423 */
c5635437
SS		 2424struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
2425 struct device *dev, const char *bus_name,
2426 struct usb_hcd *primary_hcd)
1da177e4
LT		 2427{
2428 struct usb_hcd *hcd;
2429
7b842b6e 2430 hcd = kzalloc(sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL);
1da177e4
LT		 2431 if (!hcd) {
2432 dev_dbg (dev, "hcd alloc failed\n");
2433 return NULL;
2434 }
c5635437
SS		 2435 if (primary_hcd == NULL) {
2436 hcd->bandwidth_mutex = kmalloc(sizeof(*hcd->bandwidth_mutex),
2437 GFP_KERNEL);
2438 if (!hcd->bandwidth_mutex) {
2439 kfree(hcd);
2440 dev_dbg(dev, "hcd bandwidth mutex alloc failed\n");
2441 return NULL;
2442 }
2443 mutex_init(hcd->bandwidth_mutex);
2444 dev_set_drvdata(dev, hcd);
2445 } else {
2446 hcd->bandwidth_mutex = primary_hcd->bandwidth_mutex;
2447 hcd->primary_hcd = primary_hcd;
2448 primary_hcd->primary_hcd = primary_hcd;
2449 hcd->shared_hcd = primary_hcd;
2450 primary_hcd->shared_hcd = hcd;
d673bfcb 2451 }
d673bfcb 2452
17200583 2453 kref_init(&hcd->kref);
1da177e4
LT		 2454
2455 usb_bus_init(&hcd->self);
1da177e4
LT		 2456 hcd->self.controller = dev;
2457 hcd->self.bus_name = bus_name;
dd990f16 2458 hcd->self.uses_dma = (dev->dma_mask != NULL);
1da177e4
LT		 2459
2460 init_timer(&hcd->rh_timer);
d5926ae7
AS		 2461 hcd->rh_timer.function = rh_timer_func;
2462 hcd->rh_timer.data = (unsigned long) hcd;
84ebc102 2463#ifdef CONFIG_PM_RUNTIME
6b157c9b
AS		 2464 INIT_WORK(&hcd->wakeup_work, hcd_resume_work);
2465#endif
1da177e4
LT		 2466
2467 hcd->driver = driver;
83de4b2b 2468 hcd->speed = driver->flags & HCD_MASK;
1da177e4
LT		 2469 hcd->product_desc = (driver->product_desc) ? driver->product_desc :
2470 "USB Host Controller";
1da177e4
LT		 2471 return hcd;
2472}
c5635437
SS		 2473EXPORT_SYMBOL_GPL(usb_create_shared_hcd);
2474
2475/**
2476 * usb_create_hcd - create and initialize an HCD structure
2477 * @driver: HC driver that will use this hcd
2478 * @dev: device for this HC, stored in hcd->self.controller
2479 * @bus_name: value to store in hcd->self.bus_name
2480 * Context: !in_interrupt()
2481 *
2482 * Allocate a struct usb_hcd, with extra space at the end for the
2483 * HC driver's private data. Initialize the generic members of the
2484 * hcd structure.
2485 *
626f090c
YB		 2486 * Return: On success, a pointer to the created and initialized HCD
2487 * structure. On failure (e.g. if memory is unavailable), %NULL.
c5635437
SS		 2488 */
2489struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
2490 struct device *dev, const char *bus_name)
2491{
2492 return usb_create_shared_hcd(driver, dev, bus_name, NULL);
2493}
782e70c6 2494EXPORT_SYMBOL_GPL(usb_create_hcd);
1da177e4 2495
c5635437
SS		 2496/*
2497 * Roothubs that share one PCI device must also share the bandwidth mutex.
2498 * Don't deallocate the bandwidth_mutex until the last shared usb_hcd is
2499 * deallocated.
2500 *
2501 * Make sure to only deallocate the bandwidth_mutex when the primary HCD is
2502 * freed. When hcd_release() is called for the non-primary HCD, set the
2503 * primary_hcd's shared_hcd pointer to null (since the non-primary HCD will be
2504 * freed shortly).
2505 */
17200583
AS		 2506static void hcd_release (struct kref *kref)
2507{
2508 struct usb_hcd *hcd = container_of (kref, struct usb_hcd, kref);
2509
c5635437
SS		 2510 if (usb_hcd_is_primary_hcd(hcd))
2511 kfree(hcd->bandwidth_mutex);
2512 else
2513 hcd->shared_hcd->shared_hcd = NULL;
17200583
AS		 2514 kfree(hcd);
2515}
2516
2517struct usb_hcd *usb_get_hcd (struct usb_hcd *hcd)
2518{
2519 if (hcd)
2520 kref_get (&hcd->kref);
2521 return hcd;
2522}
782e70c6 2523EXPORT_SYMBOL_GPL(usb_get_hcd);
17200583 2524
1da177e4
LT		 2525void usb_put_hcd (struct usb_hcd *hcd)
2526{
17200583
AS		 2527 if (hcd)
2528 kref_put (&hcd->kref, hcd_release);
1da177e4 2529}
782e70c6 2530EXPORT_SYMBOL_GPL(usb_put_hcd);
1da177e4 2531
c5635437
SS		 2532int usb_hcd_is_primary_hcd(struct usb_hcd *hcd)
2533{
2534 if (!hcd->primary_hcd)
2535 return 1;
2536 return hcd == hcd->primary_hcd;
2537}
2538EXPORT_SYMBOL_GPL(usb_hcd_is_primary_hcd);
2539
3f5eb141
LT		 2540int usb_hcd_find_raw_port_number(struct usb_hcd *hcd, int port1)
2541{
2542 if (!hcd->driver->find_raw_port_number)
2543 return port1;
2544
2545 return hcd->driver->find_raw_port_number(hcd, port1);
2546}
2547
23e0d106
SS		 2548static int usb_hcd_request_irqs(struct usb_hcd *hcd,
2549 unsigned int irqnum, unsigned long irqflags)
2550{
2551 int retval;
2552
2553 if (hcd->driver->irq) {
e592c5d0
GKH		 2554
2555 /* IRQF_DISABLED doesn't work as advertised when used together
2556 * with IRQF_SHARED. As usb_hcd_irq() will always disable
2557 * interrupts we can remove it here.
2558 */
2559 if (irqflags & IRQF_SHARED)
2560 irqflags &= ~IRQF_DISABLED;
2561
23e0d106
SS		 2562 snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d",
2563 hcd->driver->description, hcd->self.busnum);
2564 retval = request_irq(irqnum, &usb_hcd_irq, irqflags,
2565 hcd->irq_descr, hcd);
2566 if (retval != 0) {
2567 dev_err(hcd->self.controller,
2568 "request interrupt %d failed\n",
2569 irqnum);
2570 return retval;
2571 }
2572 hcd->irq = irqnum;
2573 dev_info(hcd->self.controller, "irq %d, %s 0x%08llx\n", irqnum,
2574 (hcd->driver->flags & HCD_MEMORY) ?
2575 "io mem" : "io base",
2576 (unsigned long long)hcd->rsrc_start);
2577 } else {
cd70469d 2578 hcd->irq = 0;
23e0d106
SS		 2579 if (hcd->rsrc_start)
2580 dev_info(hcd->self.controller, "%s 0x%08llx\n",
2581 (hcd->driver->flags & HCD_MEMORY) ?
2582 "io mem" : "io base",
2583 (unsigned long long)hcd->rsrc_start);
2584 }
2585 return 0;
2586}
2587
1da177e4
LT		 2588/**
2589 * usb_add_hcd - finish generic HCD structure initialization and register
2590 * @hcd: the usb_hcd structure to initialize
2591 * @irqnum: Interrupt line to allocate
2592 * @irqflags: Interrupt type flags
2593 *
2594 * Finish the remaining parts of generic HCD initialization: allocate the
2595 * buffers of consistent memory, register the bus, request the IRQ line,
2596 * and call the driver's reset() and start() routines.
2597 */
2598int usb_add_hcd(struct usb_hcd *hcd,
2599 unsigned int irqnum, unsigned long irqflags)
2600{
8ec8d20b
AS		 2601 int retval;
2602 struct usb_device *rhdev;
1da177e4
LT		 2603
2604 dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
2605
c4fc2342
CDH		 2606 /* Keep old behaviour if authorized_default is not in [0, 1]. */
2607 if (authorized_default < 0 || authorized_default > 1)
2608 hcd->authorized_default = hcd->wireless? 0 : 1;
2609 else
2610 hcd->authorized_default = authorized_default;
8de98402
BH		 2611 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2612
b1e8f0a6
DB		 2613 /* HC is in reset state, but accessible. Now do the one-time init,
2614 * bottom up so that hcds can customize the root hubs before khubd
2615 * starts talking to them. (Note, bus id is assigned early too.)
2616 */
1da177e4
LT		 2617 if ((retval = hcd_buffer_create(hcd)) != 0) {
2618 dev_dbg(hcd->self.controller, "pool alloc failed\n");
2619 return retval;
2620 }
2621
2622 if ((retval = usb_register_bus(&hcd->self)) < 0)
8ec8d20b 2623 goto err_register_bus;
1da177e4 2624
b1e8f0a6
DB		 2625 if ((rhdev = usb_alloc_dev(NULL, &hcd->self, 0)) == NULL) {
2626 dev_err(hcd->self.controller, "unable to allocate root hub\n");
2627 retval = -ENOMEM;
2628 goto err_allocate_root_hub;
2629 }
6d88e679 2630 hcd->self.root_hub = rhdev;
6b403b02 2631
83de4b2b 2632 switch (hcd->speed) {
6b403b02
SS		 2633 case HCD_USB11:
2634 rhdev->speed = USB_SPEED_FULL;
2635 break;
2636 case HCD_USB2:
2637 rhdev->speed = USB_SPEED_HIGH;
2638 break;
1a81f881
TP		 2639 case HCD_USB25:
2640 rhdev->speed = USB_SPEED_WIRELESS;
2641 break;
6b403b02
SS		 2642 case HCD_USB3:
2643 rhdev->speed = USB_SPEED_SUPER;
2644 break;
2645 default:
1d15ee4c 2646 retval = -EINVAL;
96e077ae 2647 goto err_set_rh_speed;
6b403b02 2648 }
b1e8f0a6 2649
db4cefaa
DB		 2650 /* wakeup flag init defaults to "everything works" for root hubs,
2651 * but drivers can override it in reset() if needed, along with
2652 * recording the overall controller's system wakeup capability.
2653 */
a6eeeb9f 2654 device_set_wakeup_capable(&rhdev->dev, 1);
db4cefaa 2655
9b37596a
AS		 2656 /* HCD_FLAG_RH_RUNNING doesn't matter until the root hub is
2657 * registered. But since the controller can die at any time,
2658 * let's initialize the flag before touching the hardware.
2659 */
2660 set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2661
b1e8f0a6
DB		 2662 /* "reset" is misnamed; its role is now one-time init. the controller
2663 * should already have been reset (and boot firmware kicked off etc).
2664 */
2665 if (hcd->driver->reset && (retval = hcd->driver->reset(hcd)) < 0) {
c10750b2 2666 dev_err(hcd->self.controller, "can't setup: %d\n", retval);
b1e8f0a6
DB		 2667 goto err_hcd_driver_setup;
2668 }
6d88e679 2669 hcd->rh_pollable = 1;
b1e8f0a6 2670
fb669cc0
DB		 2671 /* NOTE: root hub and controller capabilities may not be the same */
2672 if (device_can_wakeup(hcd->self.controller)
2673 && device_can_wakeup(&hcd->self.root_hub->dev))
b1e8f0a6 2674 dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
b1e8f0a6 2675
94dfd7ed
ML		 2676 /* initialize tasklets */
2677 init_giveback_urb_bh(&hcd->high_prio_bh);
2678 init_giveback_urb_bh(&hcd->low_prio_bh);
2679
68d07f64
SS		 2680 /* enable irqs just before we start the controller,
2681 * if the BIOS provides legacy PCI irqs.
2682 */
2683 if (usb_hcd_is_primary_hcd(hcd) && irqnum) {
c5635437
SS		 2684 retval = usb_hcd_request_irqs(hcd, irqnum, irqflags);
2685 if (retval)
2686 goto err_request_irq;
2687 }
1da177e4 2688
4814030c 2689 hcd->state = HC_STATE_RUNNING;
abc4f9b0
SS		 2690 retval = hcd->driver->start(hcd);
2691 if (retval < 0) {
1da177e4 2692 dev_err(hcd->self.controller, "startup error %d\n", retval);
8ec8d20b 2693 goto err_hcd_driver_start;
1da177e4
LT		 2694 }
2695
b1e8f0a6 2696 /* starting here, usbcore will pay attention to this root hub */
b1e8f0a6 2697 if ((retval = register_root_hub(hcd)) != 0)
8ec8d20b
AS		 2698 goto err_register_root_hub;
2699
5234ce1b
IPG		 2700 retval = sysfs_create_group(&rhdev->dev.kobj, &usb_bus_attr_group);
2701 if (retval < 0) {
2702 printk(KERN_ERR "Cannot register USB bus sysfs attributes: %d\n",
2703 retval);
2704 goto error_create_attr_group;
2705 }
541c7d43 2706 if (hcd->uses_new_polling && HCD_POLL_RH(hcd))
d5926ae7 2707 usb_hcd_poll_rh_status(hcd);
a6eeeb9f
AS		 2708
2709 /*
2710 * Host controllers don't generate their own wakeup requests;
2711 * they only forward requests from the root hub. Therefore
2712 * controllers should always be enabled for remote wakeup.
2713 */
2714 device_wakeup_enable(hcd->self.controller);
1da177e4
LT		 2715 return retval;
2716
5234ce1b 2717error_create_attr_group:
9b37596a 2718 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
96e077ae
AS		 2719 if (HC_IS_RUNNING(hcd->state))
2720 hcd->state = HC_STATE_QUIESCING;
2721 spin_lock_irq(&hcd_root_hub_lock);
2722 hcd->rh_registered = 0;
2723 spin_unlock_irq(&hcd_root_hub_lock);
2724
84ebc102 2725#ifdef CONFIG_PM_RUNTIME
96e077ae
AS		 2726 cancel_work_sync(&hcd->wakeup_work);
2727#endif
5234ce1b 2728 mutex_lock(&usb_bus_list_lock);
6d88e679 2729 usb_disconnect(&rhdev); /* Sets rhdev to NULL */
5234ce1b 2730 mutex_unlock(&usb_bus_list_lock);
b1e8f0a6 2731err_register_root_hub:
6d88e679 2732 hcd->rh_pollable = 0;
541c7d43 2733 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
6d88e679 2734 del_timer_sync(&hcd->rh_timer);
8ec8d20b 2735 hcd->driver->stop(hcd);
96e077ae 2736 hcd->state = HC_STATE_HALT;
541c7d43 2737 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
96e077ae 2738 del_timer_sync(&hcd->rh_timer);
b1e8f0a6 2739err_hcd_driver_start:
cd70469d 2740 if (usb_hcd_is_primary_hcd(hcd) && hcd->irq > 0)
1da177e4 2741 free_irq(irqnum, hcd);
b1e8f0a6
DB		 2742err_request_irq:
2743err_hcd_driver_setup:
96e077ae 2744err_set_rh_speed:
6d88e679 2745 usb_put_dev(hcd->self.root_hub);
b1e8f0a6 2746err_allocate_root_hub:
1da177e4 2747 usb_deregister_bus(&hcd->self);
b1e8f0a6 2748err_register_bus:
1da177e4
LT		 2749 hcd_buffer_destroy(hcd);
2750 return retval;
2751}
782e70c6 2752EXPORT_SYMBOL_GPL(usb_add_hcd);
1da177e4
LT		 2753
2754/**
2755 * usb_remove_hcd - shutdown processing for generic HCDs
2756 * @hcd: the usb_hcd structure to remove
2757 * Context: !in_interrupt()
2758 *
2759 * Disconnects the root hub, then reverses the effects of usb_add_hcd(),
2760 * invoking the HCD's stop() method.
2761 */
2762void usb_remove_hcd(struct usb_hcd *hcd)
2763{
6d88e679
AS		 2764 struct usb_device *rhdev = hcd->self.root_hub;
2765
1da177e4
LT		 2766 dev_info(hcd->self.controller, "remove, state %x\n", hcd->state);
2767
6d88e679
AS		 2768 usb_get_dev(rhdev);
2769 sysfs_remove_group(&rhdev->dev.kobj, &usb_bus_attr_group);
96e077ae 2770
9b37596a 2771 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
1da177e4
LT		 2772 if (HC_IS_RUNNING (hcd->state))
2773 hcd->state = HC_STATE_QUIESCING;
2774
2775 dev_dbg(hcd->self.controller, "roothub graceful disconnect\n");
2776 spin_lock_irq (&hcd_root_hub_lock);
2777 hcd->rh_registered = 0;
2778 spin_unlock_irq (&hcd_root_hub_lock);
9ad3d6cc 2779
84ebc102 2780#ifdef CONFIG_PM_RUNTIME
d5d4db70 2781 cancel_work_sync(&hcd->wakeup_work);
6b157c9b
AS		 2782#endif
2783
4186ecf8 2784 mutex_lock(&usb_bus_list_lock);
6d88e679 2785 usb_disconnect(&rhdev); /* Sets rhdev to NULL */
4186ecf8 2786 mutex_unlock(&usb_bus_list_lock);
1da177e4 2787
94dfd7ed
ML		 2788 /*
2789 * tasklet_kill() isn't needed here because:
2790 * - driver's disconnect() called from usb_disconnect() should
2791 * make sure its URBs are completed during the disconnect()
2792 * callback
2793 *
2794 * - it is too late to run complete() here since driver may have
2795 * been removed already now
2796 */
2797
6d88e679
AS		 2798 /* Prevent any more root-hub status calls from the timer.
2799 * The HCD might still restart the timer (if a port status change
2800 * interrupt occurs), but usb_hcd_poll_rh_status() won't invoke
2801 * the hub_status_data() callback.
2802 */
2803 hcd->rh_pollable = 0;
541c7d43 2804 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
6d88e679
AS		 2805 del_timer_sync(&hcd->rh_timer);
2806
1da177e4
LT		 2807 hcd->driver->stop(hcd);
2808 hcd->state = HC_STATE_HALT;
2809
6d88e679 2810 /* In case the HCD restarted the timer, stop it again. */
541c7d43 2811 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
1b42ae6d
AS		 2812 del_timer_sync(&hcd->rh_timer);
2813
c5635437 2814 if (usb_hcd_is_primary_hcd(hcd)) {
cd70469d 2815 if (hcd->irq > 0)
c5635437
SS		 2816 free_irq(hcd->irq, hcd);
2817 }
6d88e679
AS		 2818
2819 usb_put_dev(hcd->self.root_hub);
1da177e4
LT		 2820 usb_deregister_bus(&hcd->self);
2821 hcd_buffer_destroy(hcd);
2822}
782e70c6 2823EXPORT_SYMBOL_GPL(usb_remove_hcd);
1da177e4 2824
64a21d02
AG		 2825void
2826usb_hcd_platform_shutdown(struct platform_device* dev)
2827{
2828 struct usb_hcd *hcd = platform_get_drvdata(dev);
2829
2830 if (hcd->driver->shutdown)
2831 hcd->driver->shutdown(hcd);
2832}
782e70c6 2833EXPORT_SYMBOL_GPL(usb_hcd_platform_shutdown);
64a21d02 2834
1da177e4
LT		 2835/*-------------------------------------------------------------------------*/
2836
f150fa1a 2837#if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
1da177e4
LT		 2838
2839struct usb_mon_operations *mon_ops;
2840
2841/*
2842 * The registration is unlocked.
2843 * We do it this way because we do not want to lock in hot paths.
2844 *
2845 * Notice that the code is minimally error-proof. Because usbmon needs
2846 * symbols from usbcore, usbcore gets referenced and cannot be unloaded first.
2847 */
2848
2849int usb_mon_register (struct usb_mon_operations *ops)
2850{
2851
2852 if (mon_ops)
2853 return -EBUSY;
2854
2855 mon_ops = ops;
2856 mb();
2857 return 0;
2858}
2859EXPORT_SYMBOL_GPL (usb_mon_register);
2860
2861void usb_mon_deregister (void)
2862{
2863
2864 if (mon_ops == NULL) {
2865 printk(KERN_ERR "USB: monitor was not registered\n");
2866 return;
2867 }
2868 mon_ops = NULL;
2869 mb();
2870}
2871EXPORT_SYMBOL_GPL (usb_mon_deregister);
2872
f150fa1a 2873#endif /* CONFIG_USB_MON || CONFIG_USB_MON_MODULE */
Linux kernel - Deliverables
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