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Merge tag 'sound-4.6-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
[linux-2.6-block.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
14557359 9 *
1da177e4
LT		 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>
059239ad 43#include <linux/types.h>
1da177e4 44
00433254 45#include <linux/phy/phy.h>
1da177e4 46#include <linux/usb.h>
27729aad 47#include <linux/usb/hcd.h>
103e127d 48#include <linux/usb/phy.h>
1da177e4
LT		 49
50#include "usb.h"
1da177e4
LT		 51
52
1da177e4
LT		 53/*-------------------------------------------------------------------------*/
54
55/*
56 * USB Host Controller Driver framework
57 *
58 * Plugs into usbcore (usb_bus) and lets HCDs share code, minimizing
59 * HCD-specific behaviors/bugs.
60 *
61 * This does error checks, tracks devices and urbs, and delegates to a
62 * "hc_driver" only for code (and data) that really needs to know about
63 * hardware differences. That includes root hub registers, i/o queues,
64 * and so on ... but as little else as possible.
65 *
66 * Shared code includes most of the "root hub" code (these are emulated,
67 * though each HC's hardware works differently) and PCI glue, plus request
68 * tracking overhead. The HCD code should only block on spinlocks or on
69 * hardware handshaking; blocking on software events (such as other kernel
70 * threads releasing resources, or completing actions) is all generic.
71 *
72 * Happens the USB 2.0 spec says this would be invisible inside the "USBD",
73 * and includes mostly a "HCDI" (HCD Interface) along with some APIs used
74 * only by the hub driver ... and that neither should be seen or used by
75 * usb client device drivers.
76 *
77 * Contributors of ideas or unattributed patches include: David Brownell,
78 * Roman Weissgaerber, Rory Bolt, Greg Kroah-Hartman, ...
79 *
80 * HISTORY:
81 * 2002-02-21 Pull in most of the usb_bus support from usb.c; some
82 * associated cleanup. "usb_hcd" still != "usb_bus".
83 * 2001-12-12 Initial patch version for Linux 2.5.1 kernel.
84 */
85
86/*-------------------------------------------------------------------------*/
87
9beeee65
AS		 88/* Keep track of which host controller drivers are loaded */
89unsigned long usb_hcds_loaded;
90EXPORT_SYMBOL_GPL(usb_hcds_loaded);
91
1da177e4 92/* host controllers we manage */
5363de75
HK		 93DEFINE_IDR (usb_bus_idr);
94EXPORT_SYMBOL_GPL (usb_bus_idr);
1da177e4
LT		 95
96/* used when allocating bus numbers */
97#define USB_MAXBUS 64
1da177e4
LT		 98
99/* used when updating list of hcds */
a4b5d606
HK		 100DEFINE_MUTEX(usb_bus_idr_lock); /* exported only for usbfs */
101EXPORT_SYMBOL_GPL (usb_bus_idr_lock);
1da177e4
LT		 102
103/* used for controlling access to virtual root hubs */
104static DEFINE_SPINLOCK(hcd_root_hub_lock);
105
809a58b8
AS		 106/* used when updating an endpoint's URB list */
107static DEFINE_SPINLOCK(hcd_urb_list_lock);
1da177e4 108
cde217a5
AS		 109/* used to protect against unlinking URBs after the device is gone */
110static DEFINE_SPINLOCK(hcd_urb_unlink_lock);
111
1da177e4
LT		 112/* wait queue for synchronous unlinks */
113DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue);
114
809a58b8
AS		 115static inline int is_root_hub(struct usb_device *udev)
116{
117 return (udev->parent == NULL);
118}
119
1da177e4
LT		 120/*-------------------------------------------------------------------------*/
121
122/*
123 * Sharable chunks of root hub code.
124 */
125
126/*-------------------------------------------------------------------------*/
b53d657d
SAS		 127#define KERNEL_REL bin2bcd(((LINUX_VERSION_CODE >> 16) & 0x0ff))
128#define KERNEL_VER bin2bcd(((LINUX_VERSION_CODE >> 8) & 0x0ff))
1da177e4 129
9508e3b7
MN		 130/* usb 3.1 root hub device descriptor */
131static const u8 usb31_rh_dev_descriptor[18] = {
132 0x12, /* __u8 bLength; */
133 USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
134 0x10, 0x03, /* __le16 bcdUSB; v3.1 */
135
136 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
137 0x00, /* __u8 bDeviceSubClass; */
138 0x03, /* __u8 bDeviceProtocol; USB 3 hub */
139 0x09, /* __u8 bMaxPacketSize0; 2^9 = 512 Bytes */
140
141 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
142 0x03, 0x00, /* __le16 idProduct; device 0x0003 */
143 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
144
145 0x03, /* __u8 iManufacturer; */
146 0x02, /* __u8 iProduct; */
147 0x01, /* __u8 iSerialNumber; */
148 0x01 /* __u8 bNumConfigurations; */
149};
150
d2e9b4d6
SS		 151/* usb 3.0 root hub device descriptor */
152static const u8 usb3_rh_dev_descriptor[18] = {
153 0x12, /* __u8 bLength; */
d491fe75 154 USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
d2e9b4d6
SS		 155 0x00, 0x03, /* __le16 bcdUSB; v3.0 */
156
157 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
158 0x00, /* __u8 bDeviceSubClass; */
159 0x03, /* __u8 bDeviceProtocol; USB 3.0 hub */
160 0x09, /* __u8 bMaxPacketSize0; 2^9 = 512 Bytes */
161
bfb8bfad 162 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
cd780694 163 0x03, 0x00, /* __le16 idProduct; device 0x0003 */
d2e9b4d6
SS		 164 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
165
166 0x03, /* __u8 iManufacturer; */
167 0x02, /* __u8 iProduct; */
168 0x01, /* __u8 iSerialNumber; */
169 0x01 /* __u8 bNumConfigurations; */
170};
171
1a81f881
TP		 172/* usb 2.5 (wireless USB 1.0) root hub device descriptor */
173static const u8 usb25_rh_dev_descriptor[18] = {
174 0x12, /* __u8 bLength; */
d491fe75 175 USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
1a81f881
TP		 176 0x50, 0x02, /* __le16 bcdUSB; v2.5 */
177
178 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
179 0x00, /* __u8 bDeviceSubClass; */
180 0x00, /* __u8 bDeviceProtocol; [ usb 2.0 no TT ] */
181 0xFF, /* __u8 bMaxPacketSize0; always 0xFF (WUSB Spec 7.4.1). */
182
183 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
184 0x02, 0x00, /* __le16 idProduct; device 0x0002 */
185 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
186
187 0x03, /* __u8 iManufacturer; */
188 0x02, /* __u8 iProduct; */
189 0x01, /* __u8 iSerialNumber; */
190 0x01 /* __u8 bNumConfigurations; */
191};
192
1da177e4 193/* usb 2.0 root hub device descriptor */
14557359 194static const u8 usb2_rh_dev_descriptor[18] = {
1da177e4 195 0x12, /* __u8 bLength; */
d491fe75 196 USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
1da177e4
LT		 197 0x00, 0x02, /* __le16 bcdUSB; v2.0 */
198
199 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
200 0x00, /* __u8 bDeviceSubClass; */
7329e211 201 0x00, /* __u8 bDeviceProtocol; [ usb 2.0 no TT ] */
16f16d11 202 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
1da177e4 203
bfb8bfad 204 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
667d691e 205 0x02, 0x00, /* __le16 idProduct; device 0x0002 */
1da177e4
LT		 206 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
207
208 0x03, /* __u8 iManufacturer; */
209 0x02, /* __u8 iProduct; */
210 0x01, /* __u8 iSerialNumber; */
211 0x01 /* __u8 bNumConfigurations; */
212};
213
214/* no usb 2.0 root hub "device qualifier" descriptor: one speed only */
215
216/* usb 1.1 root hub device descriptor */
14557359 217static const u8 usb11_rh_dev_descriptor[18] = {
1da177e4 218 0x12, /* __u8 bLength; */
d491fe75 219 USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
1da177e4
LT		 220 0x10, 0x01, /* __le16 bcdUSB; v1.1 */
221
222 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
223 0x00, /* __u8 bDeviceSubClass; */
224 0x00, /* __u8 bDeviceProtocol; [ low/full speeds only ] */
16f16d11 225 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
1da177e4 226
bfb8bfad 227 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
667d691e 228 0x01, 0x00, /* __le16 idProduct; device 0x0001 */
1da177e4
LT		 229 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
230
231 0x03, /* __u8 iManufacturer; */
232 0x02, /* __u8 iProduct; */
233 0x01, /* __u8 iSerialNumber; */
234 0x01 /* __u8 bNumConfigurations; */
235};
236
237
238/*-------------------------------------------------------------------------*/
239
240/* Configuration descriptors for our root hubs */
241
14557359 242static const u8 fs_rh_config_descriptor[] = {
1da177e4
LT		 243
244 /* one configuration */
245 0x09, /* __u8 bLength; */
d491fe75 246 USB_DT_CONFIG, /* __u8 bDescriptorType; Configuration */
1da177e4
LT		 247 0x19, 0x00, /* __le16 wTotalLength; */
248 0x01, /* __u8 bNumInterfaces; (1) */
249 0x01, /* __u8 bConfigurationValue; */
250 0x00, /* __u8 iConfiguration; */
14557359 251 0xc0, /* __u8 bmAttributes;
1da177e4
LT		 252 Bit 7: must be set,
253 6: Self-powered,
254 5: Remote wakeup,
255 4..0: resvd */
256 0x00, /* __u8 MaxPower; */
14557359 257
1da177e4
LT		 258 /* USB 1.1:
259 * USB 2.0, single TT organization (mandatory):
260 * one interface, protocol 0
261 *
262 * USB 2.0, multiple TT organization (optional):
263 * two interfaces, protocols 1 (like single TT)
264 * and 2 (multiple TT mode) ... config is
265 * sometimes settable
266 * NOT IMPLEMENTED
267 */
268
269 /* one interface */
270 0x09, /* __u8 if_bLength; */
d491fe75 271 USB_DT_INTERFACE, /* __u8 if_bDescriptorType; Interface */
1da177e4
LT		 272 0x00, /* __u8 if_bInterfaceNumber; */
273 0x00, /* __u8 if_bAlternateSetting; */
274 0x01, /* __u8 if_bNumEndpoints; */
275 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
276 0x00, /* __u8 if_bInterfaceSubClass; */
277 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
278 0x00, /* __u8 if_iInterface; */
14557359 279
1da177e4
LT		 280 /* one endpoint (status change endpoint) */
281 0x07, /* __u8 ep_bLength; */
d491fe75 282 USB_DT_ENDPOINT, /* __u8 ep_bDescriptorType; Endpoint */
1da177e4 283 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
14557359
MB		 284 0x03, /* __u8 ep_bmAttributes; Interrupt */
285 0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */
1da177e4
LT		 286 0xff /* __u8 ep_bInterval; (255ms -- usb 2.0 spec) */
287};
288
14557359 289static const u8 hs_rh_config_descriptor[] = {
1da177e4
LT		 290
291 /* one configuration */
292 0x09, /* __u8 bLength; */
d491fe75 293 USB_DT_CONFIG, /* __u8 bDescriptorType; Configuration */
1da177e4
LT		 294 0x19, 0x00, /* __le16 wTotalLength; */
295 0x01, /* __u8 bNumInterfaces; (1) */
296 0x01, /* __u8 bConfigurationValue; */
297 0x00, /* __u8 iConfiguration; */
14557359 298 0xc0, /* __u8 bmAttributes;
1da177e4
LT		 299 Bit 7: must be set,
300 6: Self-powered,
301 5: Remote wakeup,
302 4..0: resvd */
303 0x00, /* __u8 MaxPower; */
14557359 304
1da177e4
LT		 305 /* USB 1.1:
306 * USB 2.0, single TT organization (mandatory):
307 * one interface, protocol 0
308 *
309 * USB 2.0, multiple TT organization (optional):
310 * two interfaces, protocols 1 (like single TT)
311 * and 2 (multiple TT mode) ... config is
312 * sometimes settable
313 * NOT IMPLEMENTED
314 */
315
316 /* one interface */
317 0x09, /* __u8 if_bLength; */
d491fe75 318 USB_DT_INTERFACE, /* __u8 if_bDescriptorType; Interface */
1da177e4
LT		 319 0x00, /* __u8 if_bInterfaceNumber; */
320 0x00, /* __u8 if_bAlternateSetting; */
321 0x01, /* __u8 if_bNumEndpoints; */
322 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
323 0x00, /* __u8 if_bInterfaceSubClass; */
324 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
325 0x00, /* __u8 if_iInterface; */
14557359 326
1da177e4
LT		 327 /* one endpoint (status change endpoint) */
328 0x07, /* __u8 ep_bLength; */
d491fe75 329 USB_DT_ENDPOINT, /* __u8 ep_bDescriptorType; Endpoint */
1da177e4 330 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
14557359 331 0x03, /* __u8 ep_bmAttributes; Interrupt */
88fafff9 332 /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
333 * see hub.c:hub_configure() for details. */
334 (USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
1da177e4
LT		 335 0x0c /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
336};
337
d2e9b4d6
SS		 338static const u8 ss_rh_config_descriptor[] = {
339 /* one configuration */
340 0x09, /* __u8 bLength; */
d491fe75 341 USB_DT_CONFIG, /* __u8 bDescriptorType; Configuration */
22c6a35d 342 0x1f, 0x00, /* __le16 wTotalLength; */
d2e9b4d6
SS		 343 0x01, /* __u8 bNumInterfaces; (1) */
344 0x01, /* __u8 bConfigurationValue; */
345 0x00, /* __u8 iConfiguration; */
346 0xc0, /* __u8 bmAttributes;
347 Bit 7: must be set,
348 6: Self-powered,
349 5: Remote wakeup,
350 4..0: resvd */
351 0x00, /* __u8 MaxPower; */
352
353 /* one interface */
354 0x09, /* __u8 if_bLength; */
d491fe75 355 USB_DT_INTERFACE, /* __u8 if_bDescriptorType; Interface */
d2e9b4d6
SS		 356 0x00, /* __u8 if_bInterfaceNumber; */
357 0x00, /* __u8 if_bAlternateSetting; */
358 0x01, /* __u8 if_bNumEndpoints; */
359 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
360 0x00, /* __u8 if_bInterfaceSubClass; */
361 0x00, /* __u8 if_bInterfaceProtocol; */
362 0x00, /* __u8 if_iInterface; */
363
364 /* one endpoint (status change endpoint) */
365 0x07, /* __u8 ep_bLength; */
d491fe75 366 USB_DT_ENDPOINT, /* __u8 ep_bDescriptorType; Endpoint */
d2e9b4d6
SS		 367 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
368 0x03, /* __u8 ep_bmAttributes; Interrupt */
369 /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
370 * see hub.c:hub_configure() for details. */
371 (USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
22c6a35d
SS		 372 0x0c, /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
373
374 /* one SuperSpeed endpoint companion descriptor */
375 0x06, /* __u8 ss_bLength */
d491fe75
SS		 376 USB_DT_SS_ENDPOINT_COMP, /* __u8 ss_bDescriptorType; SuperSpeed EP */
377 /* Companion */
22c6a35d
SS		 378 0x00, /* __u8 ss_bMaxBurst; allows 1 TX between ACKs */
379 0x00, /* __u8 ss_bmAttributes; 1 packet per service interval */
380 0x02, 0x00 /* __le16 ss_wBytesPerInterval; 15 bits for max 15 ports */
d2e9b4d6
SS		 381};
382
c4fc2342
CDH		 383/* authorized_default behaviour:
384 * -1 is authorized for all devices except wireless (old behaviour)
385 * 0 is unauthorized for all devices
386 * 1 is authorized for all devices
387 */
388static int authorized_default = -1;
389module_param(authorized_default, int, S_IRUGO|S_IWUSR);
390MODULE_PARM_DESC(authorized_default,
391 "Default USB device authorization: 0 is not authorized, 1 is "
392 "authorized, -1 is authorized except for wireless USB (default, "
393 "old behaviour");
1da177e4
LT		 394/*-------------------------------------------------------------------------*/
395
392ca68b
GS		 396/**
397 * ascii2desc() - Helper routine for producing UTF-16LE string descriptors
398 * @s: Null-terminated ASCII (actually ISO-8859-1) string
399 * @buf: Buffer for USB string descriptor (header + UTF-16LE)
400 * @len: Length (in bytes; may be odd) of descriptor buffer.
401 *
626f090c
YB		 402 * Return: The number of bytes filled in: 2 + 2*strlen(s) or @len,
403 * whichever is less.
392ca68b 404 *
626f090c 405 * Note:
392ca68b
GS		 406 * USB String descriptors can contain at most 126 characters; input
407 * strings longer than that are truncated.
1da177e4 408 */
392ca68b
GS		 409static unsigned
410ascii2desc(char const *s, u8 *buf, unsigned len)
1da177e4 411{
392ca68b
GS		 412 unsigned n, t = 2 + 2*strlen(s);
413
414 if (t > 254)
415 t = 254; /* Longest possible UTF string descriptor */
416 if (len > t)
417 len = t;
418
419 t += USB_DT_STRING << 8; /* Now t is first 16 bits to store */
420
421 n = len;
422 while (n--) {
423 *buf++ = t;
424 if (!n--)
425 break;
426 *buf++ = t >> 8;
427 t = (unsigned char)*s++;
1da177e4 428 }
392ca68b 429 return len;
1da177e4
LT		 430}
431
392ca68b
GS		 432/**
433 * rh_string() - provides string descriptors for root hub
434 * @id: the string ID number (0: langids, 1: serial #, 2: product, 3: vendor)
1da177e4 435 * @hcd: the host controller for this root hub
392ca68b
GS		 436 * @data: buffer for output packet
437 * @len: length of the provided buffer
1da177e4
LT		 438 *
439 * Produces either a manufacturer, product or serial number string for the
440 * virtual root hub device.
626f090c
YB		 441 *
442 * Return: The number of bytes filled in: the length of the descriptor or
392ca68b 443 * of the provided buffer, whichever is less.
1da177e4 444 */
392ca68b
GS		 445static unsigned
446rh_string(int id, struct usb_hcd const *hcd, u8 *data, unsigned len)
71d2718f 447{
392ca68b
GS		 448 char buf[100];
449 char const *s;
450 static char const langids[4] = {4, USB_DT_STRING, 0x09, 0x04};
1da177e4 451
048cb21c 452 /* language ids */
392ca68b
GS		 453 switch (id) {
454 case 0:
455 /* Array of LANGID codes (0x0409 is MSFT-speak for "en-us") */
456 /* See http://www.usb.org/developers/docs/USB_LANGIDs.pdf */
457 if (len > 4)
458 len = 4;
459 memcpy(data, langids, len);
1da177e4 460 return len;
392ca68b
GS		 461 case 1:
462 /* Serial number */
463 s = hcd->self.bus_name;
464 break;
465 case 2:
466 /* Product name */
467 s = hcd->product_desc;
468 break;
469 case 3:
470 /* Manufacturer */
96b644bd
SH		 471 snprintf (buf, sizeof buf, "%s %s %s", init_utsname()->sysname,
472 init_utsname()->release, hcd->driver->description);
392ca68b
GS		 473 s = buf;
474 break;
1da177e4 475 default:
392ca68b
GS		 476 /* Can't happen; caller guarantees it */
477 return 0;
1da177e4 478 }
392ca68b
GS		 479
480 return ascii2desc(s, data, len);
1da177e4
LT		 481}
482
483
484/* Root hub control transfers execute synchronously */
485static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
486{
487 struct usb_ctrlrequest *cmd;
14557359 488 u16 typeReq, wValue, wIndex, wLength;
1da177e4 489 u8 *ubuf = urb->transfer_buffer;
71d2718f 490 unsigned len = 0;
e9df41c5 491 int status;
7329e211
AS		 492 u8 patch_wakeup = 0;
493 u8 patch_protocol = 0;
e57e780b
SS		 494 u16 tbuf_size;
495 u8 *tbuf = NULL;
496 const u8 *bufp;
1da177e4 497
9439eb94
AS		 498 might_sleep();
499
e9df41c5
AS		 500 spin_lock_irq(&hcd_root_hub_lock);
501 status = usb_hcd_link_urb_to_ep(hcd, urb);
502 spin_unlock_irq(&hcd_root_hub_lock);
503 if (status)
504 return status;
b0d9efba 505 urb->hcpriv = hcd; /* Indicate it's queued */
e9df41c5 506
1da177e4
LT		 507 cmd = (struct usb_ctrlrequest *) urb->setup_packet;
508 typeReq = (cmd->bRequestType << 8) | cmd->bRequest;
509 wValue = le16_to_cpu (cmd->wValue);
510 wIndex = le16_to_cpu (cmd->wIndex);
511 wLength = le16_to_cpu (cmd->wLength);
512
513 if (wLength > urb->transfer_buffer_length)
514 goto error;
515
e57e780b
SS		 516 /*
517 * tbuf should be at least as big as the
518 * USB hub descriptor.
519 */
520 tbuf_size = max_t(u16, sizeof(struct usb_hub_descriptor), wLength);
521 tbuf = kzalloc(tbuf_size, GFP_KERNEL);
522 if (!tbuf)
523 return -ENOMEM;
524
525 bufp = tbuf;
526
527
1da177e4
LT		 528 urb->actual_length = 0;
529 switch (typeReq) {
530
531 /* DEVICE REQUESTS */
532
fb669cc0
DB		 533 /* The root hub's remote wakeup enable bit is implemented using
534 * driver model wakeup flags. If this system supports wakeup
535 * through USB, userspace may change the default "allow wakeup"
536 * policy through sysfs or these calls.
537 *
538 * Most root hubs support wakeup from downstream devices, for
539 * runtime power management (disabling USB clocks and reducing
540 * VBUS power usage). However, not all of them do so; silicon,
541 * board, and BIOS bugs here are not uncommon, so these can't
542 * be treated quite like external hubs.
543 *
544 * Likewise, not all root hubs will pass wakeup events upstream,
545 * to wake up the whole system. So don't assume root hub and
546 * controller capabilities are identical.
547 */
548
1da177e4 549 case DeviceRequest | USB_REQ_GET_STATUS:
14557359 550 tbuf[0] = (device_may_wakeup(&hcd->self.root_hub->dev)
fb669cc0 551 << USB_DEVICE_REMOTE_WAKEUP)
1da177e4 552 | (1 << USB_DEVICE_SELF_POWERED);
14557359 553 tbuf[1] = 0;
1da177e4
LT		 554 len = 2;
555 break;
556 case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
557 if (wValue == USB_DEVICE_REMOTE_WAKEUP)
fb669cc0 558 device_set_wakeup_enable(&hcd->self.root_hub->dev, 0);
1da177e4
LT		 559 else
560 goto error;
561 break;
562 case DeviceOutRequest | USB_REQ_SET_FEATURE:
fb669cc0
DB		 563 if (device_can_wakeup(&hcd->self.root_hub->dev)
564 && wValue == USB_DEVICE_REMOTE_WAKEUP)
565 device_set_wakeup_enable(&hcd->self.root_hub->dev, 1);
1da177e4
LT		 566 else
567 goto error;
568 break;
569 case DeviceRequest | USB_REQ_GET_CONFIGURATION:
14557359 570 tbuf[0] = 1;
1da177e4
LT		 571 len = 1;
572 /* FALLTHROUGH */
573 case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
574 break;
575 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
576 switch (wValue & 0xff00) {
577 case USB_DT_DEVICE << 8:
83de4b2b 578 switch (hcd->speed) {
71175225 579 case HCD_USB31:
9508e3b7
MN		 580 bufp = usb31_rh_dev_descriptor;
581 break;
7dd19e69 582 case HCD_USB3:
d2e9b4d6 583 bufp = usb3_rh_dev_descriptor;
7dd19e69 584 break;
1a81f881
TP		 585 case HCD_USB25:
586 bufp = usb25_rh_dev_descriptor;
587 break;
7dd19e69 588 case HCD_USB2:
1da177e4 589 bufp = usb2_rh_dev_descriptor;
7dd19e69
VM		 590 break;
591 case HCD_USB11:
1da177e4 592 bufp = usb11_rh_dev_descriptor;
7dd19e69
VM		 593 break;
594 default:
1da177e4 595 goto error;
7dd19e69 596 }
1da177e4 597 len = 18;
7329e211
AS		 598 if (hcd->has_tt)
599 patch_protocol = 1;
1da177e4
LT		 600 break;
601 case USB_DT_CONFIG << 8:
83de4b2b 602 switch (hcd->speed) {
71175225 603 case HCD_USB31:
7dd19e69 604 case HCD_USB3:
d2e9b4d6
SS		 605 bufp = ss_rh_config_descriptor;
606 len = sizeof ss_rh_config_descriptor;
7dd19e69 607 break;
1a81f881 608 case HCD_USB25:
7dd19e69 609 case HCD_USB2:
1da177e4
LT		 610 bufp = hs_rh_config_descriptor;
611 len = sizeof hs_rh_config_descriptor;
7dd19e69
VM		 612 break;
613 case HCD_USB11:
1da177e4
LT		 614 bufp = fs_rh_config_descriptor;
615 len = sizeof fs_rh_config_descriptor;
7dd19e69
VM		 616 break;
617 default:
618 goto error;
1da177e4 619 }
fb669cc0 620 if (device_can_wakeup(&hcd->self.root_hub->dev))
1da177e4
LT		 621 patch_wakeup = 1;
622 break;
623 case USB_DT_STRING << 8:
71d2718f
RK		 624 if ((wValue & 0xff) < 4)
625 urb->actual_length = rh_string(wValue & 0xff,
626 hcd, ubuf, wLength);
627 else /* unsupported IDs --> "protocol stall" */
1da177e4 628 goto error;
1da177e4 629 break;
48e82361
SS		 630 case USB_DT_BOS << 8:
631 goto nongeneric;
1da177e4
LT		 632 default:
633 goto error;
634 }
635 break;
636 case DeviceRequest | USB_REQ_GET_INTERFACE:
14557359 637 tbuf[0] = 0;
1da177e4
LT		 638 len = 1;
639 /* FALLTHROUGH */
640 case DeviceOutRequest | USB_REQ_SET_INTERFACE:
641 break;
642 case DeviceOutRequest | USB_REQ_SET_ADDRESS:
048cb21c 643 /* wValue == urb->dev->devaddr */
1da177e4
LT		 644 dev_dbg (hcd->self.controller, "root hub device address %d\n",
645 wValue);
646 break;
647
648 /* INTERFACE REQUESTS (no defined feature/status flags) */
649
650 /* ENDPOINT REQUESTS */
651
652 case EndpointRequest | USB_REQ_GET_STATUS:
048cb21c 653 /* ENDPOINT_HALT flag */
14557359
MB		 654 tbuf[0] = 0;
655 tbuf[1] = 0;
1da177e4
LT		 656 len = 2;
657 /* FALLTHROUGH */
658 case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
659 case EndpointOutRequest | USB_REQ_SET_FEATURE:
660 dev_dbg (hcd->self.controller, "no endpoint features yet\n");
661 break;
662
663 /* CLASS REQUESTS (and errors) */
664
665 default:
48e82361 666nongeneric:
1da177e4 667 /* non-generic request */
b13296c6
DB		 668 switch (typeReq) {
669 case GetHubStatus:
b13296c6
DB		 670 len = 4;
671 break;
0cdd49a1
MN		 672 case GetPortStatus:
673 if (wValue == HUB_PORT_STATUS)
674 len = 4;
675 else
676 /* other port status types return 8 bytes */
677 len = 8;
678 break;
b13296c6
DB		 679 case GetHubDescriptor:
680 len = sizeof (struct usb_hub_descriptor);
681 break;
48e82361
SS		 682 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
683 /* len is returned by hub_control */
684 break;
1da177e4 685 }
b13296c6
DB		 686 status = hcd->driver->hub_control (hcd,
687 typeReq, wValue, wIndex,
688 tbuf, wLength);
d2123fd9
LT		 689
690 if (typeReq == GetHubDescriptor)
691 usb_hub_adjust_deviceremovable(hcd->self.root_hub,
692 (struct usb_hub_descriptor *)tbuf);
1da177e4
LT		 693 break;
694error:
695 /* "protocol stall" on error */
696 status = -EPIPE;
697 }
698
48e82361 699 if (status < 0) {
1da177e4
LT		 700 len = 0;
701 if (status != -EPIPE) {
702 dev_dbg (hcd->self.controller,
703 "CTRL: TypeReq=0x%x val=0x%x "
704 "idx=0x%x len=%d ==> %d\n",
705 typeReq, wValue, wIndex,
b13296c6 706 wLength, status);
1da177e4 707 }
48e82361
SS		 708 } else if (status > 0) {
709 /* hub_control may return the length of data copied. */
710 len = status;
711 status = 0;
1da177e4
LT		 712 }
713 if (len) {
714 if (urb->transfer_buffer_length < len)
715 len = urb->transfer_buffer_length;
716 urb->actual_length = len;
048cb21c 717 /* always USB_DIR_IN, toward host */
1da177e4
LT		 718 memcpy (ubuf, bufp, len);
719
720 /* report whether RH hardware supports remote wakeup */
721 if (patch_wakeup &&
722 len > offsetof (struct usb_config_descriptor,
723 bmAttributes))
724 ((struct usb_config_descriptor *)ubuf)->bmAttributes
725 |= USB_CONFIG_ATT_WAKEUP;
7329e211
AS		 726
727 /* report whether RH hardware has an integrated TT */
728 if (patch_protocol &&
729 len > offsetof(struct usb_device_descriptor,
730 bDeviceProtocol))
731 ((struct usb_device_descriptor *) ubuf)->
7bf01185 732 bDeviceProtocol = USB_HUB_PR_HS_SINGLE_TT;
1da177e4
LT		 733 }
734
e57e780b
SS		 735 kfree(tbuf);
736
1da177e4 737 /* any errors get returned through the urb completion */
9439eb94 738 spin_lock_irq(&hcd_root_hub_lock);
e9df41c5 739 usb_hcd_unlink_urb_from_ep(hcd, urb);
4a00027d 740 usb_hcd_giveback_urb(hcd, urb, status);
9439eb94 741 spin_unlock_irq(&hcd_root_hub_lock);
1da177e4
LT		 742 return 0;
743}
744
745/*-------------------------------------------------------------------------*/
746
747/*
d5926ae7
AS		 748 * Root Hub interrupt transfers are polled using a timer if the
749 * driver requests it; otherwise the driver is responsible for
750 * calling usb_hcd_poll_rh_status() when an event occurs.
1da177e4 751 *
d5926ae7
AS		 752 * Completions are called in_interrupt(), but they may or may not
753 * be in_irq().
1da177e4 754 */
d5926ae7
AS		 755void usb_hcd_poll_rh_status(struct usb_hcd *hcd)
756{
757 struct urb *urb;
758 int length;
759 unsigned long flags;
ad361c98 760 char buffer[6]; /* Any root hubs with > 31 ports? */
1da177e4 761
6d88e679 762 if (unlikely(!hcd->rh_pollable))
1b42ae6d 763 return;
d5926ae7
AS		 764 if (!hcd->uses_new_polling && !hcd->status_urb)
765 return;
1da177e4 766
d5926ae7
AS		 767 length = hcd->driver->hub_status_data(hcd, buffer);
768 if (length > 0) {
1da177e4 769
d5926ae7 770 /* try to complete the status urb */
9439eb94 771 spin_lock_irqsave(&hcd_root_hub_lock, flags);
d5926ae7
AS		 772 urb = hcd->status_urb;
773 if (urb) {
541c7d43 774 clear_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
e9df41c5 775 hcd->status_urb = NULL;
e9df41c5
AS		 776 urb->actual_length = length;
777 memcpy(urb->transfer_buffer, buffer, length);
9439eb94 778
e9df41c5 779 usb_hcd_unlink_urb_from_ep(hcd, urb);
4a00027d 780 usb_hcd_giveback_urb(hcd, urb, 0);
e9df41c5 781 } else {
d5926ae7 782 length = 0;
541c7d43 783 set_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
e9df41c5 784 }
9439eb94 785 spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
1da177e4
LT		 786 }
787
d5926ae7 788 /* The USB 2.0 spec says 256 ms. This is close enough and won't
01cd0819
AV		 789 * exceed that limit if HZ is 100. The math is more clunky than
790 * maybe expected, this is to make sure that all timers for USB devices
25985edc 791 * fire at the same time to give the CPU a break in between */
541c7d43 792 if (hcd->uses_new_polling ? HCD_POLL_RH(hcd) :
d5926ae7 793 (length == 0 && hcd->status_urb != NULL))
01cd0819 794 mod_timer (&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));
1da177e4 795}
d5926ae7 796EXPORT_SYMBOL_GPL(usb_hcd_poll_rh_status);
1da177e4
LT		 797
798/* timer callback */
d5926ae7
AS		 799static void rh_timer_func (unsigned long _hcd)
800{
801 usb_hcd_poll_rh_status((struct usb_hcd *) _hcd);
802}
803
804/*-------------------------------------------------------------------------*/
1da177e4 805
d5926ae7 806static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb)
1da177e4 807{
d5926ae7 808 int retval;
1da177e4 809 unsigned long flags;
71d2718f 810 unsigned len = 1 + (urb->dev->maxchild / 8);
1da177e4 811
d5926ae7 812 spin_lock_irqsave (&hcd_root_hub_lock, flags);
e9df41c5 813 if (hcd->status_urb || urb->transfer_buffer_length < len) {
d5926ae7
AS		 814 dev_dbg (hcd->self.controller, "not queuing rh status urb\n");
815 retval = -EINVAL;
e9df41c5
AS		 816 goto done;
817 }
1da177e4 818
e9df41c5
AS		 819 retval = usb_hcd_link_urb_to_ep(hcd, urb);
820 if (retval)
821 goto done;
1da177e4 822
e9df41c5
AS		 823 hcd->status_urb = urb;
824 urb->hcpriv = hcd; /* indicate it's queued */
825 if (!hcd->uses_new_polling)
826 mod_timer(&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));
827
828 /* If a status change has already occurred, report it ASAP */
541c7d43 829 else if (HCD_POLL_PENDING(hcd))
e9df41c5
AS		 830 mod_timer(&hcd->rh_timer, jiffies);
831 retval = 0;
832 done:
d5926ae7
AS		 833 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
834 return retval;
1da177e4
LT		 835}
836
1da177e4
LT		 837static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb)
838{
5e60a161 839 if (usb_endpoint_xfer_int(&urb->ep->desc))
d5926ae7 840 return rh_queue_status (hcd, urb);
5e60a161 841 if (usb_endpoint_xfer_control(&urb->ep->desc))
1da177e4 842 return rh_call_control (hcd, urb);
d5926ae7 843 return -EINVAL;
1da177e4
LT		 844}
845
846/*-------------------------------------------------------------------------*/
847
455b25fb
AS		 848/* Unlinks of root-hub control URBs are legal, but they don't do anything
849 * since these URBs always execute synchronously.
d5926ae7 850 */
e9df41c5 851static int usb_rh_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1da177e4 852{
455b25fb 853 unsigned long flags;
e9df41c5 854 int rc;
1da177e4 855
9439eb94 856 spin_lock_irqsave(&hcd_root_hub_lock, flags);
e9df41c5
AS		 857 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
858 if (rc)
859 goto done;
860
5e60a161 861 if (usb_endpoint_num(&urb->ep->desc) == 0) { /* Control URB */
455b25fb 862 ; /* Do nothing */
d5926ae7
AS		 863
864 } else { /* Status URB */
865 if (!hcd->uses_new_polling)
455b25fb 866 del_timer (&hcd->rh_timer);
d5926ae7
AS		 867 if (urb == hcd->status_urb) {
868 hcd->status_urb = NULL;
e9df41c5 869 usb_hcd_unlink_urb_from_ep(hcd, urb);
4a00027d 870 usb_hcd_giveback_urb(hcd, urb, status);
9439eb94
AS		 871 }
872 }
e9df41c5 873 done:
9439eb94 874 spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
e9df41c5 875 return rc;
1da177e4
LT		 876}
877
5234ce1b
IPG		 878
879
880/*
881 * Show & store the current value of authorized_default
882 */
d03f254f
GKH		 883static ssize_t authorized_default_show(struct device *dev,
884 struct device_attribute *attr, char *buf)
5234ce1b
IPG		 885{
886 struct usb_device *rh_usb_dev = to_usb_device(dev);
887 struct usb_bus *usb_bus = rh_usb_dev->bus;
ff8e2c56 888 struct usb_hcd *hcd;
5234ce1b 889
ff8e2c56
SK		 890 hcd = bus_to_hcd(usb_bus);
891 return snprintf(buf, PAGE_SIZE, "%u\n", !!HCD_DEV_AUTHORIZED(hcd));
5234ce1b
IPG		 892}
893
d03f254f
GKH		 894static ssize_t authorized_default_store(struct device *dev,
895 struct device_attribute *attr,
896 const char *buf, size_t size)
5234ce1b
IPG		 897{
898 ssize_t result;
899 unsigned val;
900 struct usb_device *rh_usb_dev = to_usb_device(dev);
901 struct usb_bus *usb_bus = rh_usb_dev->bus;
ff8e2c56 902 struct usb_hcd *hcd;
5234ce1b 903
ff8e2c56 904 hcd = bus_to_hcd(usb_bus);
5234ce1b
IPG		 905 result = sscanf(buf, "%u\n", &val);
906 if (result == 1) {
ff8e2c56
SK		 907 if (val)
908 set_bit(HCD_FLAG_DEV_AUTHORIZED, &hcd->flags);
909 else
910 clear_bit(HCD_FLAG_DEV_AUTHORIZED, &hcd->flags);
911
5234ce1b 912 result = size;
d1ddb0a6 913 } else {
5234ce1b 914 result = -EINVAL;
d1ddb0a6 915 }
5234ce1b
IPG		 916 return result;
917}
d03f254f 918static DEVICE_ATTR_RW(authorized_default);
5234ce1b 919
6b2bd3c8
SK		 920/*
921 * interface_authorized_default_show - show default authorization status
922 * for USB interfaces
923 *
924 * note: interface_authorized_default is the default value
925 * for initializing the authorized attribute of interfaces
926 */
927static ssize_t interface_authorized_default_show(struct device *dev,
928 struct device_attribute *attr, char *buf)
929{
930 struct usb_device *usb_dev = to_usb_device(dev);
931 struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus);
932
933 return sprintf(buf, "%u\n", !!HCD_INTF_AUTHORIZED(hcd));
934}
935
936/*
937 * interface_authorized_default_store - store default authorization status
938 * for USB interfaces
939 *
940 * note: interface_authorized_default is the default value
941 * for initializing the authorized attribute of interfaces
942 */
943static ssize_t interface_authorized_default_store(struct device *dev,
944 struct device_attribute *attr, const char *buf, size_t count)
945{
946 struct usb_device *usb_dev = to_usb_device(dev);
947 struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus);
948 int rc = count;
949 bool val;
950
951 if (strtobool(buf, &val) != 0)
952 return -EINVAL;
953
954 if (val)
955 set_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
956 else
957 clear_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
958
959 return rc;
960}
961static DEVICE_ATTR_RW(interface_authorized_default);
962
5234ce1b
IPG		 963/* Group all the USB bus attributes */
964static struct attribute *usb_bus_attrs[] = {
965 &dev_attr_authorized_default.attr,
6b2bd3c8 966 &dev_attr_interface_authorized_default.attr,
5234ce1b
IPG		 967 NULL,
968};
969
970static struct attribute_group usb_bus_attr_group = {
971 .name = NULL, /* we want them in the same directory */
972 .attrs = usb_bus_attrs,
973};
974
975
976
1da177e4
LT		 977/*-------------------------------------------------------------------------*/
978
1da177e4
LT		 979/**
980 * usb_bus_init - shared initialization code
981 * @bus: the bus structure being initialized
982 *
983 * This code is used to initialize a usb_bus structure, memory for which is
984 * separately managed.
985 */
986static void usb_bus_init (struct usb_bus *bus)
987{
988 memset (&bus->devmap, 0, sizeof(struct usb_devmap));
989
990 bus->devnum_next = 1;
991
992 bus->root_hub = NULL;
1da177e4
LT		 993 bus->busnum = -1;
994 bus->bandwidth_allocated = 0;
995 bus->bandwidth_int_reqs = 0;
996 bus->bandwidth_isoc_reqs = 0;
6fecd4f2 997 mutex_init(&bus->usb_address0_mutex);
1da177e4
LT		 998}
999
1da177e4
LT		 1000/*-------------------------------------------------------------------------*/
1001
1002/**
1003 * usb_register_bus - registers the USB host controller with the usb core
1004 * @bus: pointer to the bus to register
1005 * Context: !in_interrupt()
1006 *
1007 * Assigns a bus number, and links the controller into usbcore data
1008 * structures so that it can be seen by scanning the bus list.
626f090c
YB		 1009 *
1010 * Return: 0 if successful. A negative error code otherwise.
1da177e4
LT		 1011 */
1012static int usb_register_bus(struct usb_bus *bus)
1013{
eb579f58 1014 int result = -E2BIG;
1da177e4 1015 int busnum;
1da177e4 1016
a4b5d606 1017 mutex_lock(&usb_bus_idr_lock);
5363de75
HK		 1018 busnum = idr_alloc(&usb_bus_idr, bus, 1, USB_MAXBUS, GFP_KERNEL);
1019 if (busnum < 0) {
1020 pr_err("%s: failed to get bus number\n", usbcore_name);
eb579f58 1021 goto error_find_busnum;
1da177e4 1022 }
eb579f58 1023 bus->busnum = busnum;
a4b5d606 1024 mutex_unlock(&usb_bus_idr_lock);
1da177e4 1025
3099e75a 1026 usb_notify_add_bus(bus);
1da177e4 1027
eb579f58
IPG		 1028 dev_info (bus->controller, "new USB bus registered, assigned bus "
1029 "number %d\n", bus->busnum);
1da177e4 1030 return 0;
eb579f58 1031
eb579f58 1032error_find_busnum:
a4b5d606 1033 mutex_unlock(&usb_bus_idr_lock);
eb579f58 1034 return result;
1da177e4
LT		 1035}
1036
1037/**
1038 * usb_deregister_bus - deregisters the USB host controller
1039 * @bus: pointer to the bus to deregister
1040 * Context: !in_interrupt()
1041 *
1042 * Recycles the bus number, and unlinks the controller from usbcore data
1043 * structures so that it won't be seen by scanning the bus list.
1044 */
1045static void usb_deregister_bus (struct usb_bus *bus)
1046{
1047 dev_info (bus->controller, "USB bus %d deregistered\n", bus->busnum);
1048
1049 /*
1050 * NOTE: make sure that all the devices are removed by the
1051 * controller code, as well as having it call this when cleaning
1052 * itself up
1053 */
a4b5d606 1054 mutex_lock(&usb_bus_idr_lock);
5363de75 1055 idr_remove(&usb_bus_idr, bus->busnum);
a4b5d606 1056 mutex_unlock(&usb_bus_idr_lock);
1da177e4 1057
3099e75a 1058 usb_notify_remove_bus(bus);
1da177e4
LT		 1059}
1060
1061/**
8ec8d20b 1062 * register_root_hub - called by usb_add_hcd() to register a root hub
1da177e4
LT		 1063 * @hcd: host controller for this root hub
1064 *
8ec8d20b 1065 * This function registers the root hub with the USB subsystem. It sets up
b1e8f0a6
DB		 1066 * the device properly in the device tree and then calls usb_new_device()
1067 * to register the usb device. It also assigns the root hub's USB address
1068 * (always 1).
626f090c
YB		 1069 *
1070 * Return: 0 if successful. A negative error code otherwise.
1da177e4 1071 */
b1e8f0a6 1072static int register_root_hub(struct usb_hcd *hcd)
1da177e4
LT		 1073{
1074 struct device *parent_dev = hcd->self.controller;
b1e8f0a6 1075 struct usb_device *usb_dev = hcd->self.root_hub;
1da177e4
LT		 1076 const int devnum = 1;
1077 int retval;
1078
1da177e4
LT		 1079 usb_dev->devnum = devnum;
1080 usb_dev->bus->devnum_next = devnum + 1;
1081 memset (&usb_dev->bus->devmap.devicemap, 0,
1082 sizeof usb_dev->bus->devmap.devicemap);
1083 set_bit (devnum, usb_dev->bus->devmap.devicemap);
1084 usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
1085
a4b5d606 1086 mutex_lock(&usb_bus_idr_lock);
1da177e4 1087
551509d2 1088 usb_dev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
1da177e4
LT		 1089 retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE);
1090 if (retval != sizeof usb_dev->descriptor) {
a4b5d606 1091 mutex_unlock(&usb_bus_idr_lock);
1da177e4 1092 dev_dbg (parent_dev, "can't read %s device descriptor %d\n",
7071a3ce 1093 dev_name(&usb_dev->dev), retval);
1da177e4
LT		 1094 return (retval < 0) ? retval : -EMSGSIZE;
1095 }
2d2a3167
LB		 1096
1097 if (le16_to_cpu(usb_dev->descriptor.bcdUSB) >= 0x0201) {
448b6eb1 1098 retval = usb_get_bos_descriptor(usb_dev);
2d2a3167
LB		 1099 if (!retval) {
1100 usb_dev->lpm_capable = usb_device_supports_lpm(usb_dev);
8a1b2725 1101 } else if (usb_dev->speed >= USB_SPEED_SUPER) {
a4b5d606 1102 mutex_unlock(&usb_bus_idr_lock);
448b6eb1
SS		 1103 dev_dbg(parent_dev, "can't read %s bos descriptor %d\n",
1104 dev_name(&usb_dev->dev), retval);
1105 return retval;
1106 }
1107 }
1da177e4 1108
1da177e4 1109 retval = usb_new_device (usb_dev);
1da177e4 1110 if (retval) {
1da177e4 1111 dev_err (parent_dev, "can't register root hub for %s, %d\n",
7071a3ce 1112 dev_name(&usb_dev->dev), retval);
0a231403 1113 } else {
1da177e4
LT		 1114 spin_lock_irq (&hcd_root_hub_lock);
1115 hcd->rh_registered = 1;
1116 spin_unlock_irq (&hcd_root_hub_lock);
1117
1118 /* Did the HC die before the root hub was registered? */
69fff59d 1119 if (HCD_DEAD(hcd))
1da177e4
LT		 1120 usb_hc_died (hcd); /* This time clean up */
1121 }
a4b5d606 1122 mutex_unlock(&usb_bus_idr_lock);
1da177e4
LT		 1123
1124 return retval;
1125}
1da177e4 1126
da0aa716
AS		 1127/*
1128 * usb_hcd_start_port_resume - a root-hub port is sending a resume signal
1129 * @bus: the bus which the root hub belongs to
1130 * @portnum: the port which is being resumed
1131 *
1132 * HCDs should call this function when they know that a resume signal is
1133 * being sent to a root-hub port. The root hub will be prevented from
1134 * going into autosuspend until usb_hcd_end_port_resume() is called.
1135 *
1136 * The bus's private lock must be held by the caller.
1137 */
1138void usb_hcd_start_port_resume(struct usb_bus *bus, int portnum)
1139{
1140 unsigned bit = 1 << portnum;
1141
1142 if (!(bus->resuming_ports & bit)) {
1143 bus->resuming_ports |= bit;
1144 pm_runtime_get_noresume(&bus->root_hub->dev);
1145 }
1146}
1147EXPORT_SYMBOL_GPL(usb_hcd_start_port_resume);
1148
1149/*
1150 * usb_hcd_end_port_resume - a root-hub port has stopped sending a resume signal
1151 * @bus: the bus which the root hub belongs to
1152 * @portnum: the port which is being resumed
1153 *
1154 * HCDs should call this function when they know that a resume signal has
1155 * stopped being sent to a root-hub port. The root hub will be allowed to
1156 * autosuspend again.
1157 *
1158 * The bus's private lock must be held by the caller.
1159 */
1160void usb_hcd_end_port_resume(struct usb_bus *bus, int portnum)
1161{
1162 unsigned bit = 1 << portnum;
1163
1164 if (bus->resuming_ports & bit) {
1165 bus->resuming_ports &= ~bit;
1166 pm_runtime_put_noidle(&bus->root_hub->dev);
1167 }
1168}
1169EXPORT_SYMBOL_GPL(usb_hcd_end_port_resume);
1da177e4
LT		 1170
1171/*-------------------------------------------------------------------------*/
1172
1173/**
1174 * usb_calc_bus_time - approximate periodic transaction time in nanoseconds
1175 * @speed: from dev->speed; USB_SPEED_{LOW,FULL,HIGH}
1176 * @is_input: true iff the transaction sends data to the host
1177 * @isoc: true for isochronous transactions, false for interrupt ones
1178 * @bytecount: how many bytes in the transaction.
1179 *
626f090c
YB		 1180 * Return: Approximate bus time in nanoseconds for a periodic transaction.
1181 *
1182 * Note:
1da177e4
LT		 1183 * See USB 2.0 spec section 5.11.3; only periodic transfers need to be
1184 * scheduled in software, this function is only used for such scheduling.
1185 */
1186long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount)
1187{
1188 unsigned long tmp;
1189
1190 switch (speed) {
1191 case USB_SPEED_LOW: /* INTR only */
1192 if (is_input) {
1193 tmp = (67667L * (31L + 10L * BitTime (bytecount))) / 1000L;
07010496 1194 return 64060L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp;
1da177e4
LT		 1195 } else {
1196 tmp = (66700L * (31L + 10L * BitTime (bytecount))) / 1000L;
07010496 1197 return 64107L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp;
1da177e4
LT		 1198 }
1199 case USB_SPEED_FULL: /* ISOC or INTR */
1200 if (isoc) {
1201 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
07010496 1202 return ((is_input) ? 7268L : 6265L) + BW_HOST_DELAY + tmp;
1da177e4
LT		 1203 } else {
1204 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
07010496 1205 return 9107L + BW_HOST_DELAY + tmp;
1da177e4
LT		 1206 }
1207 case USB_SPEED_HIGH: /* ISOC or INTR */
048cb21c 1208 /* FIXME adjust for input vs output */
1da177e4 1209 if (isoc)
498f78e6 1210 tmp = HS_NSECS_ISO (bytecount);
1da177e4 1211 else
498f78e6 1212 tmp = HS_NSECS (bytecount);
1da177e4
LT		 1213 return tmp;
1214 default:
1215 pr_debug ("%s: bogus device speed!\n", usbcore_name);
1216 return -1;
1217 }
1218}
782e70c6 1219EXPORT_SYMBOL_GPL(usb_calc_bus_time);
1da177e4 1220
1da177e4
LT		 1221
1222/*-------------------------------------------------------------------------*/
1223
1224/*
1225 * Generic HC operations.
1226 */
1227
1228/*-------------------------------------------------------------------------*/
1229
e9df41c5
AS		 1230/**
1231 * usb_hcd_link_urb_to_ep - add an URB to its endpoint queue
1232 * @hcd: host controller to which @urb was submitted
1233 * @urb: URB being submitted
1234 *
1235 * Host controller drivers should call this routine in their enqueue()
1236 * method. The HCD's private spinlock must be held and interrupts must
1237 * be disabled. The actions carried out here are required for URB
1238 * submission, as well as for endpoint shutdown and for usb_kill_urb.
1239 *
626f090c 1240 * Return: 0 for no error, otherwise a negative error code (in which case
e9df41c5
AS		 1241 * the enqueue() method must fail). If no error occurs but enqueue() fails
1242 * anyway, it must call usb_hcd_unlink_urb_from_ep() before releasing
1243 * the private spinlock and returning.
1244 */
1245int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb)
1da177e4 1246{
9a9bf406 1247 int rc = 0;
1da177e4 1248
e9df41c5 1249 spin_lock(&hcd_urb_list_lock);
1da177e4 1250
9a9bf406 1251 /* Check that the URB isn't being killed */
49367d8f 1252 if (unlikely(atomic_read(&urb->reject))) {
9a9bf406
AS		 1253 rc = -EPERM;
1254 goto done;
9f6a93f7 1255 }
1da177e4 1256
9a9bf406
AS		 1257 if (unlikely(!urb->ep->enabled)) {
1258 rc = -ENOENT;
1259 goto done;
1260 }
1da177e4 1261
6840d255
AS		 1262 if (unlikely(!urb->dev->can_submit)) {
1263 rc = -EHOSTUNREACH;
1264 goto done;
1265 }
1266
1da177e4 1267 /*
9a9bf406
AS		 1268 * Check the host controller's state and add the URB to the
1269 * endpoint's queue.
1da177e4 1270 */
9b37596a 1271 if (HCD_RH_RUNNING(hcd)) {
eb231054 1272 urb->unlinked = 0;
9a9bf406 1273 list_add_tail(&urb->urb_list, &urb->ep->urb_list);
9b37596a 1274 } else {
9a9bf406
AS		 1275 rc = -ESHUTDOWN;
1276 goto done;
1da177e4 1277 }
9a9bf406 1278 done:
e9df41c5 1279 spin_unlock(&hcd_urb_list_lock);
9a9bf406
AS		 1280 return rc;
1281}
e9df41c5 1282EXPORT_SYMBOL_GPL(usb_hcd_link_urb_to_ep);
9a9bf406 1283
e9df41c5
AS		 1284/**
1285 * usb_hcd_check_unlink_urb - check whether an URB may be unlinked
1286 * @hcd: host controller to which @urb was submitted
1287 * @urb: URB being checked for unlinkability
1288 * @status: error code to store in @urb if the unlink succeeds
1289 *
1290 * Host controller drivers should call this routine in their dequeue()
1291 * method. The HCD's private spinlock must be held and interrupts must
1292 * be disabled. The actions carried out here are required for making
1293 * sure than an unlink is valid.
1294 *
626f090c 1295 * Return: 0 for no error, otherwise a negative error code (in which case
e9df41c5
AS		 1296 * the dequeue() method must fail). The possible error codes are:
1297 *
1298 * -EIDRM: @urb was not submitted or has already completed.
1299 * The completion function may not have been called yet.
1300 *
1301 * -EBUSY: @urb has already been unlinked.
1302 */
1303int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
9a9bf406
AS		 1304 int status)
1305{
9a9bf406 1306 struct list_head *tmp;
9a9bf406
AS		 1307
1308 /* insist the urb is still queued */
1309 list_for_each(tmp, &urb->ep->urb_list) {
1310 if (tmp == &urb->urb_list)
1311 break;
1312 }
e9df41c5
AS		 1313 if (tmp != &urb->urb_list)
1314 return -EIDRM;
1da177e4 1315
9a9bf406
AS		 1316 /* Any status except -EINPROGRESS means something already started to
1317 * unlink this URB from the hardware. So there's no more work to do.
1da177e4 1318 */
eb231054 1319 if (urb->unlinked)
e9df41c5 1320 return -EBUSY;
eb231054 1321 urb->unlinked = status;
e9df41c5 1322 return 0;
9a9bf406 1323}
e9df41c5 1324EXPORT_SYMBOL_GPL(usb_hcd_check_unlink_urb);
9a9bf406 1325
e9df41c5
AS		 1326/**
1327 * usb_hcd_unlink_urb_from_ep - remove an URB from its endpoint queue
1328 * @hcd: host controller to which @urb was submitted
1329 * @urb: URB being unlinked
1330 *
1331 * Host controller drivers should call this routine before calling
1332 * usb_hcd_giveback_urb(). The HCD's private spinlock must be held and
1333 * interrupts must be disabled. The actions carried out here are required
1334 * for URB completion.
1335 */
1336void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb)
9a9bf406 1337{
9a9bf406 1338 /* clear all state linking urb to this dev (and hcd) */
e9df41c5 1339 spin_lock(&hcd_urb_list_lock);
9a9bf406 1340 list_del_init(&urb->urb_list);
e9df41c5 1341 spin_unlock(&hcd_urb_list_lock);
9a9bf406 1342}
e9df41c5 1343EXPORT_SYMBOL_GPL(usb_hcd_unlink_urb_from_ep);
9a9bf406 1344
b3476675
MD		 1345/*
1346 * Some usb host controllers can only perform dma using a small SRAM area.
1347 * The usb core itself is however optimized for host controllers that can dma
1348 * using regular system memory - like pci devices doing bus mastering.
1349 *
a6cd244b 1350 * To support host controllers with limited dma capabilities we provide dma
b3476675
MD		 1351 * bounce buffers. This feature can be enabled using the HCD_LOCAL_MEM flag.
1352 * For this to work properly the host controller code must first use the
1353 * function dma_declare_coherent_memory() to point out which memory area
1354 * that should be used for dma allocations.
1355 *
1356 * The HCD_LOCAL_MEM flag then tells the usb code to allocate all data for
1357 * dma using dma_alloc_coherent() which in turn allocates from the memory
1358 * area pointed out with dma_declare_coherent_memory().
1359 *
1360 * So, to summarize...
1361 *
1362 * - We need "local" memory, canonical example being
1363 * a small SRAM on a discrete controller being the
1364 * only memory that the controller can read ...
1365 * (a) "normal" kernel memory is no good, and
1366 * (b) there's not enough to share
1367 *
1368 * - The only *portable* hook for such stuff in the
1369 * DMA framework is dma_declare_coherent_memory()
1370 *
1371 * - So we use that, even though the primary requirement
025d4430 1372 * is that the memory be "local" (hence addressable
b3476675
MD		 1373 * by that device), not "coherent".
1374 *
1375 */
1376
1377static int hcd_alloc_coherent(struct usb_bus *bus,
1378 gfp_t mem_flags, dma_addr_t *dma_handle,
1379 void **vaddr_handle, size_t size,
1380 enum dma_data_direction dir)
1381{
1382 unsigned char *vaddr;
1383
4307a28e
AR		 1384 if (*vaddr_handle == NULL) {
1385 WARN_ON_ONCE(1);
1386 return -EFAULT;
1387 }
1388
b3476675
MD		 1389 vaddr = hcd_buffer_alloc(bus, size + sizeof(vaddr),
1390 mem_flags, dma_handle);
1391 if (!vaddr)
1392 return -ENOMEM;
1393
1394 /*
1395 * Store the virtual address of the buffer at the end
1396 * of the allocated dma buffer. The size of the buffer
1397 * may be uneven so use unaligned functions instead
1398 * of just rounding up. It makes sense to optimize for
1399 * memory footprint over access speed since the amount
1400 * of memory available for dma may be limited.
1401 */
1402 put_unaligned((unsigned long)*vaddr_handle,
1403 (unsigned long *)(vaddr + size));
1404
1405 if (dir == DMA_TO_DEVICE)
1406 memcpy(vaddr, *vaddr_handle, size);
1407
1408 *vaddr_handle = vaddr;
1409 return 0;
1410}
1411
1412static void hcd_free_coherent(struct usb_bus *bus, dma_addr_t *dma_handle,
1413 void **vaddr_handle, size_t size,
1414 enum dma_data_direction dir)
1415{
1416 unsigned char *vaddr = *vaddr_handle;
1417
1418 vaddr = (void *)get_unaligned((unsigned long *)(vaddr + size));
1419
1420 if (dir == DMA_FROM_DEVICE)
1421 memcpy(vaddr, *vaddr_handle, size);
1422
1423 hcd_buffer_free(bus, size + sizeof(vaddr), *vaddr_handle, *dma_handle);
1424
1425 *vaddr_handle = vaddr;
1426 *dma_handle = 0;
1427}
1428
c8cf203a 1429void usb_hcd_unmap_urb_setup_for_dma(struct usb_hcd *hcd, struct urb *urb)
ff9c895f 1430{
58f2266f
GU		 1431 if (IS_ENABLED(CONFIG_HAS_DMA) &&
1432 (urb->transfer_flags & URB_SETUP_MAP_SINGLE))
ff9c895f
AS		 1433 dma_unmap_single(hcd->self.controller,
1434 urb->setup_dma,
1435 sizeof(struct usb_ctrlrequest),
1436 DMA_TO_DEVICE);
1437 else if (urb->transfer_flags & URB_SETUP_MAP_LOCAL)
1438 hcd_free_coherent(urb->dev->bus,
1439 &urb->setup_dma,
1440 (void **) &urb->setup_packet,
1441 sizeof(struct usb_ctrlrequest),
1442 DMA_TO_DEVICE);
1443
1dae423d
MF		 1444 /* Make it safe to call this routine more than once */
1445 urb->transfer_flags &= ~(URB_SETUP_MAP_SINGLE | URB_SETUP_MAP_LOCAL);
1446}
c8cf203a 1447EXPORT_SYMBOL_GPL(usb_hcd_unmap_urb_setup_for_dma);
1dae423d 1448
2694a48d
RM		 1449static void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
1450{
1451 if (hcd->driver->unmap_urb_for_dma)
1452 hcd->driver->unmap_urb_for_dma(hcd, urb);
1453 else
1454 usb_hcd_unmap_urb_for_dma(hcd, urb);
1455}
1456
c8cf203a 1457void usb_hcd_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
1dae423d
MF		 1458{
1459 enum dma_data_direction dir;
1460
c8cf203a 1461 usb_hcd_unmap_urb_setup_for_dma(hcd, urb);
1dae423d 1462
ff9c895f 1463 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
58f2266f
GU		 1464 if (IS_ENABLED(CONFIG_HAS_DMA) &&
1465 (urb->transfer_flags & URB_DMA_MAP_SG))
ff9c895f 1466 dma_unmap_sg(hcd->self.controller,
910f8d0c 1467 urb->sg,
ff9c895f
AS		 1468 urb->num_sgs,
1469 dir);
58f2266f
GU		 1470 else if (IS_ENABLED(CONFIG_HAS_DMA) &&
1471 (urb->transfer_flags & URB_DMA_MAP_PAGE))
ff9c895f
AS		 1472 dma_unmap_page(hcd->self.controller,
1473 urb->transfer_dma,
1474 urb->transfer_buffer_length,
1475 dir);
58f2266f
GU		 1476 else if (IS_ENABLED(CONFIG_HAS_DMA) &&
1477 (urb->transfer_flags & URB_DMA_MAP_SINGLE))
ff9c895f
AS		 1478 dma_unmap_single(hcd->self.controller,
1479 urb->transfer_dma,
1480 urb->transfer_buffer_length,
1481 dir);
1482 else if (urb->transfer_flags & URB_MAP_LOCAL)
1483 hcd_free_coherent(urb->dev->bus,
1484 &urb->transfer_dma,
1485 &urb->transfer_buffer,
1486 urb->transfer_buffer_length,
1487 dir);
1488
1489 /* Make it safe to call this routine more than once */
1dae423d 1490 urb->transfer_flags &= ~(URB_DMA_MAP_SG | URB_DMA_MAP_PAGE |
ff9c895f
AS		 1491 URB_DMA_MAP_SINGLE | URB_MAP_LOCAL);
1492}
c8cf203a 1493EXPORT_SYMBOL_GPL(usb_hcd_unmap_urb_for_dma);
ff9c895f 1494
b3476675
MD		 1495static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
1496 gfp_t mem_flags)
2694a48d
RM		 1497{
1498 if (hcd->driver->map_urb_for_dma)
1499 return hcd->driver->map_urb_for_dma(hcd, urb, mem_flags);
1500 else
1501 return usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
1502}
1503
1504int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
1505 gfp_t mem_flags)
9a9bf406 1506{
b3476675
MD		 1507 enum dma_data_direction dir;
1508 int ret = 0;
1509
9a9bf406
AS		 1510 /* Map the URB's buffers for DMA access.
1511 * Lower level HCD code should use *_dma exclusively,
e04748e3
SS		 1512 * unless it uses pio or talks to another transport,
1513 * or uses the provided scatter gather list for bulk.
1da177e4 1514 */
b3476675 1515
85bcb5ee 1516 if (usb_endpoint_xfer_control(&urb->ep->desc)) {
07a8cdd2
AG		 1517 if (hcd->self.uses_pio_for_control)
1518 return ret;
58f2266f 1519 if (IS_ENABLED(CONFIG_HAS_DMA) && hcd->self.uses_dma) {
b3476675 1520 urb->setup_dma = dma_map_single(
1da177e4
LT		 1521 hcd->self.controller,
1522 urb->setup_packet,
b3476675 1523 sizeof(struct usb_ctrlrequest),
1da177e4 1524 DMA_TO_DEVICE);
85e034fd
LF		 1525 if (dma_mapping_error(hcd->self.controller,
1526 urb->setup_dma))
1527 return -EAGAIN;
ff9c895f 1528 urb->transfer_flags |= URB_SETUP_MAP_SINGLE;
f537da68 1529 } else if (hcd->driver->flags & HCD_LOCAL_MEM) {
b3476675
MD		 1530 ret = hcd_alloc_coherent(
1531 urb->dev->bus, mem_flags,
1532 &urb->setup_dma,
1533 (void **)&urb->setup_packet,
1534 sizeof(struct usb_ctrlrequest),
1535 DMA_TO_DEVICE);
ff9c895f
AS		 1536 if (ret)
1537 return ret;
1538 urb->transfer_flags |= URB_SETUP_MAP_LOCAL;
f537da68 1539 }
b3476675
MD		 1540 }
1541
1542 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
ff9c895f 1543 if (urb->transfer_buffer_length != 0
b3476675 1544 && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) {
58f2266f 1545 if (IS_ENABLED(CONFIG_HAS_DMA) && hcd->self.uses_dma) {
ff9c895f 1546 if (urb->num_sgs) {
fe2072cc
HG		 1547 int n;
1548
1549 /* We don't support sg for isoc transfers ! */
1550 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1551 WARN_ON(1);
1552 return -EINVAL;
1553 }
1554
1555 n = dma_map_sg(
ff9c895f 1556 hcd->self.controller,
910f8d0c 1557 urb->sg,
ff9c895f
AS		 1558 urb->num_sgs,
1559 dir);
1560 if (n <= 0)
1561 ret = -EAGAIN;
1562 else
1563 urb->transfer_flags |= URB_DMA_MAP_SG;
bc677d5b
CL		 1564 urb->num_mapped_sgs = n;
1565 if (n != urb->num_sgs)
ff9c895f
AS		 1566 urb->transfer_flags |=
1567 URB_DMA_SG_COMBINED;
ff9c895f 1568 } else if (urb->sg) {
910f8d0c 1569 struct scatterlist *sg = urb->sg;
ff9c895f
AS		 1570 urb->transfer_dma = dma_map_page(
1571 hcd->self.controller,
1572 sg_page(sg),
1573 sg->offset,
1574 urb->transfer_buffer_length,
1575 dir);
1576 if (dma_mapping_error(hcd->self.controller,
85e034fd 1577 urb->transfer_dma))
ff9c895f
AS		 1578 ret = -EAGAIN;
1579 else
1580 urb->transfer_flags |= URB_DMA_MAP_PAGE;
29d2fef8
DW		 1581 } else if (is_vmalloc_addr(urb->transfer_buffer)) {
1582 WARN_ONCE(1, "transfer buffer not dma capable\n");
1583 ret = -EAGAIN;
ff9c895f
AS		 1584 } else {
1585 urb->transfer_dma = dma_map_single(
1586 hcd->self.controller,
1587 urb->transfer_buffer,
1588 urb->transfer_buffer_length,
1589 dir);
1590 if (dma_mapping_error(hcd->self.controller,
1591 urb->transfer_dma))
1592 ret = -EAGAIN;
1593 else
1594 urb->transfer_flags |= URB_DMA_MAP_SINGLE;
1595 }
85e034fd 1596 } else if (hcd->driver->flags & HCD_LOCAL_MEM) {
b3476675
MD		 1597 ret = hcd_alloc_coherent(
1598 urb->dev->bus, mem_flags,
1599 &urb->transfer_dma,
1600 &urb->transfer_buffer,
1601 urb->transfer_buffer_length,
1602 dir);
ff9c895f
AS		 1603 if (ret == 0)
1604 urb->transfer_flags |= URB_MAP_LOCAL;
b3476675 1605 }
ff9c895f
AS		 1606 if (ret && (urb->transfer_flags & (URB_SETUP_MAP_SINGLE |
1607 URB_SETUP_MAP_LOCAL)))
c8cf203a 1608 usb_hcd_unmap_urb_for_dma(hcd, urb);
1da177e4 1609 }
b3476675 1610 return ret;
9a9bf406 1611}
2694a48d 1612EXPORT_SYMBOL_GPL(usb_hcd_map_urb_for_dma);
1da177e4 1613
9a9bf406
AS		 1614/*-------------------------------------------------------------------------*/
1615
1616/* may be called in any context with a valid urb->dev usecount
1617 * caller surrenders "ownership" of urb
1618 * expects usb_submit_urb() to have sanity checked and conditioned all
1619 * inputs in the urb
1620 */
1621int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
1622{
1623 int status;
1624 struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus);
1625
1626 /* increment urb's reference count as part of giving it to the HCD
1627 * (which will control it). HCD guarantees that it either returns
1628 * an error or calls giveback(), but not both.
1629 */
1630 usb_get_urb(urb);
1631 atomic_inc(&urb->use_count);
4d59d8a1 1632 atomic_inc(&urb->dev->urbnum);
9a9bf406
AS		 1633 usbmon_urb_submit(&hcd->self, urb);
1634
1635 /* NOTE requirements on root-hub callers (usbfs and the hub
1636 * driver, for now): URBs' urb->transfer_buffer must be
1637 * valid and usb_buffer_{sync,unmap}() not be needed, since
1638 * they could clobber root hub response data. Also, control
1639 * URBs must be submitted in process context with interrupts
1640 * enabled.
1641 */
b3476675 1642
ff9c895f 1643 if (is_root_hub(urb->dev)) {
e9df41c5 1644 status = rh_urb_enqueue(hcd, urb);
ff9c895f
AS		 1645 } else {
1646 status = map_urb_for_dma(hcd, urb, mem_flags);
1647 if (likely(status == 0)) {
1648 status = hcd->driver->urb_enqueue(hcd, urb, mem_flags);
1649 if (unlikely(status))
2694a48d 1650 unmap_urb_for_dma(hcd, urb);
ff9c895f
AS		 1651 }
1652 }
9a9bf406
AS		 1653
1654 if (unlikely(status)) {
1da177e4 1655 usbmon_urb_submit_error(&hcd->self, urb, status);
b0d9efba 1656 urb->hcpriv = NULL;
9a9bf406
AS		 1657 INIT_LIST_HEAD(&urb->urb_list);
1658 atomic_dec(&urb->use_count);
4d59d8a1 1659 atomic_dec(&urb->dev->urbnum);
49367d8f 1660 if (atomic_read(&urb->reject))
9a9bf406
AS		 1661 wake_up(&usb_kill_urb_queue);
1662 usb_put_urb(urb);
1da177e4
LT		 1663 }
1664 return status;
1665}
1666
1667/*-------------------------------------------------------------------------*/
1668
1da177e4
LT		 1669/* this makes the hcd giveback() the urb more quickly, by kicking it
1670 * off hardware queues (which may take a while) and returning it as
1671 * soon as practical. we've already set up the urb's return status,
1672 * but we can't know if the callback completed already.
1673 */
e9df41c5 1674static int unlink1(struct usb_hcd *hcd, struct urb *urb, int status)
1da177e4
LT		 1675{
1676 int value;
1677
809a58b8 1678 if (is_root_hub(urb->dev))
e9df41c5 1679 value = usb_rh_urb_dequeue(hcd, urb, status);
1da177e4
LT		 1680 else {
1681
1682 /* The only reason an HCD might fail this call is if
1683 * it has not yet fully queued the urb to begin with.
1684 * Such failures should be harmless. */
e9df41c5 1685 value = hcd->driver->urb_dequeue(hcd, urb, status);
1da177e4 1686 }
1da177e4
LT		 1687 return value;
1688}
1689
1690/*
1691 * called in any context
1692 *
1693 * caller guarantees urb won't be recycled till both unlink()
1694 * and the urb's completion function return
1695 */
a6d2bb9f 1696int usb_hcd_unlink_urb (struct urb *urb, int status)
1da177e4 1697{
9a9bf406 1698 struct usb_hcd *hcd;
c9919790 1699 struct usb_device *udev = urb->dev;
cde217a5
AS		 1700 int retval = -EIDRM;
1701 unsigned long flags;
1da177e4 1702
cde217a5
AS		 1703 /* Prevent the device and bus from going away while
1704 * the unlink is carried out. If they are already gone
1705 * then urb->use_count must be 0, since disconnected
1706 * devices can't have any active URBs.
1707 */
1708 spin_lock_irqsave(&hcd_urb_unlink_lock, flags);
1709 if (atomic_read(&urb->use_count) > 0) {
1710 retval = 0;
c9919790 1711 usb_get_dev(udev);
cde217a5
AS		 1712 }
1713 spin_unlock_irqrestore(&hcd_urb_unlink_lock, flags);
1714 if (retval == 0) {
1715 hcd = bus_to_hcd(urb->dev->bus);
1716 retval = unlink1(hcd, urb, status);
c9919790
AS		 1717 if (retval == 0)
1718 retval = -EINPROGRESS;
1719 else if (retval != -EIDRM && retval != -EBUSY)
1720 dev_dbg(&udev->dev, "hcd_unlink_urb %p fail %d\n",
1721 urb, retval);
1722 usb_put_dev(udev);
cde217a5 1723 }
1da177e4
LT		 1724 return retval;
1725}
1726
1727/*-------------------------------------------------------------------------*/
1728
94dfd7ed
ML		 1729static void __usb_hcd_giveback_urb(struct urb *urb)
1730{
1731 struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus);
6ec4147e 1732 struct usb_anchor *anchor = urb->anchor;
94dfd7ed
ML		 1733 int status = urb->unlinked;
1734 unsigned long flags;
1735
1736 urb->hcpriv = NULL;
1737 if (unlikely((urb->transfer_flags & URB_SHORT_NOT_OK) &&
1738 urb->actual_length < urb->transfer_buffer_length &&
1739 !status))
1740 status = -EREMOTEIO;
1741
1742 unmap_urb_for_dma(hcd, urb);
1743 usbmon_urb_complete(&hcd->self, urb, status);
6ec4147e 1744 usb_anchor_suspend_wakeups(anchor);
94dfd7ed 1745 usb_unanchor_urb(urb);
0cfbd328
MS		 1746 if (likely(status == 0))
1747 usb_led_activity(USB_LED_EVENT_HOST);
94dfd7ed
ML		 1748
1749 /* pass ownership to the completion handler */
1750 urb->status = status;
1751
1752 /*
1753 * We disable local IRQs here avoid possible deadlock because
1754 * drivers may call spin_lock() to hold lock which might be
1755 * acquired in one hard interrupt handler.
1756 *
1757 * The local_irq_save()/local_irq_restore() around complete()
1758 * will be removed if current USB drivers have been cleaned up
1759 * and no one may trigger the above deadlock situation when
1760 * running complete() in tasklet.
1761 */
1762 local_irq_save(flags);
1763 urb->complete(urb);
1764 local_irq_restore(flags);
1765
6ec4147e 1766 usb_anchor_resume_wakeups(anchor);
94dfd7ed
ML		 1767 atomic_dec(&urb->use_count);
1768 if (unlikely(atomic_read(&urb->reject)))
1769 wake_up(&usb_kill_urb_queue);
1770 usb_put_urb(urb);
1771}
1772
1773static void usb_giveback_urb_bh(unsigned long param)
1774{
1775 struct giveback_urb_bh *bh = (struct giveback_urb_bh *)param;
1776 struct list_head local_list;
1777
1778 spin_lock_irq(&bh->lock);
1779 bh->running = true;
1780 restart:
1781 list_replace_init(&bh->head, &local_list);
1782 spin_unlock_irq(&bh->lock);
1783
1784 while (!list_empty(&local_list)) {
1785 struct urb *urb;
1786
1787 urb = list_entry(local_list.next, struct urb, urb_list);
1788 list_del_init(&urb->urb_list);
c7ccde6e 1789 bh->completing_ep = urb->ep;
94dfd7ed 1790 __usb_hcd_giveback_urb(urb);
c7ccde6e 1791 bh->completing_ep = NULL;
94dfd7ed
ML		 1792 }
1793
1794 /* check if there are new URBs to giveback */
1795 spin_lock_irq(&bh->lock);
1796 if (!list_empty(&bh->head))
1797 goto restart;
1798 bh->running = false;
1799 spin_unlock_irq(&bh->lock);
1800}
1801
32aca560
AS		 1802/**
1803 * usb_hcd_giveback_urb - return URB from HCD to device driver
1804 * @hcd: host controller returning the URB
1805 * @urb: urb being returned to the USB device driver.
4a00027d 1806 * @status: completion status code for the URB.
32aca560
AS		 1807 * Context: in_interrupt()
1808 *
1809 * This hands the URB from HCD to its USB device driver, using its
1810 * completion function. The HCD has freed all per-urb resources
1811 * (and is done using urb->hcpriv). It also released all HCD locks;
1812 * the device driver won't cause problems if it frees, modifies,
1813 * or resubmits this URB.
eb231054 1814 *
4a00027d 1815 * If @urb was unlinked, the value of @status will be overridden by
eb231054
AS		 1816 * @urb->unlinked. Erroneous short transfers are detected in case
1817 * the HCD hasn't checked for them.
32aca560 1818 */
4a00027d 1819void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb, int status)
32aca560 1820{
94dfd7ed
ML		 1821 struct giveback_urb_bh *bh;
1822 bool running, high_prio_bh;
32aca560 1823
94dfd7ed
ML		 1824 /* pass status to tasklet via unlinked */
1825 if (likely(!urb->unlinked))
1826 urb->unlinked = status;
1f5a3d0f 1827
94dfd7ed
ML		 1828 if (!hcd_giveback_urb_in_bh(hcd) && !is_root_hub(urb->dev)) {
1829 __usb_hcd_giveback_urb(urb);
1830 return;
1831 }
1832
1833 if (usb_pipeisoc(urb->pipe) || usb_pipeint(urb->pipe)) {
1834 bh = &hcd->high_prio_bh;
1835 high_prio_bh = true;
1836 } else {
1837 bh = &hcd->low_prio_bh;
1838 high_prio_bh = false;
1839 }
1840
1841 spin_lock(&bh->lock);
1842 list_add_tail(&urb->urb_list, &bh->head);
1843 running = bh->running;
1844 spin_unlock(&bh->lock);
1845
1846 if (running)
1847 ;
1848 else if (high_prio_bh)
1849 tasklet_hi_schedule(&bh->bh);
1850 else
1851 tasklet_schedule(&bh->bh);
32aca560 1852}
782e70c6 1853EXPORT_SYMBOL_GPL(usb_hcd_giveback_urb);
32aca560
AS		 1854
1855/*-------------------------------------------------------------------------*/
1856
95cf82f9
AS		 1857/* Cancel all URBs pending on this endpoint and wait for the endpoint's
1858 * queue to drain completely. The caller must first insure that no more
1859 * URBs can be submitted for this endpoint.
1da177e4 1860 */
95cf82f9 1861void usb_hcd_flush_endpoint(struct usb_device *udev,
a6d2bb9f 1862 struct usb_host_endpoint *ep)
1da177e4
LT		 1863{
1864 struct usb_hcd *hcd;
1865 struct urb *urb;
1866
95cf82f9
AS		 1867 if (!ep)
1868 return;
9a9bf406 1869 might_sleep();
17200583 1870 hcd = bus_to_hcd(udev->bus);
1da177e4 1871
95cf82f9 1872 /* No more submits can occur */
9a9bf406 1873 spin_lock_irq(&hcd_urb_list_lock);
ddc1fd6a 1874rescan:
1da177e4 1875 list_for_each_entry (urb, &ep->urb_list, urb_list) {
5e60a161 1876 int is_in;
1da177e4 1877
eb231054 1878 if (urb->unlinked)
1da177e4
LT		 1879 continue;
1880 usb_get_urb (urb);
5e60a161 1881 is_in = usb_urb_dir_in(urb);
809a58b8 1882 spin_unlock(&hcd_urb_list_lock);
1da177e4 1883
e9df41c5
AS		 1884 /* kick hcd */
1885 unlink1(hcd, urb, -ESHUTDOWN);
1886 dev_dbg (hcd->self.controller,
1887 "shutdown urb %p ep%d%s%s\n",
1888 urb, usb_endpoint_num(&ep->desc),
1889 is_in ? "in" : "out",
1890 ({ char *s;
1891
1892 switch (usb_endpoint_type(&ep->desc)) {
1893 case USB_ENDPOINT_XFER_CONTROL:
1894 s = ""; break;
1895 case USB_ENDPOINT_XFER_BULK:
1896 s = "-bulk"; break;
1897 case USB_ENDPOINT_XFER_INT:
1898 s = "-intr"; break;
1899 default:
14557359 1900 s = "-iso"; break;
e9df41c5
AS		 1901 };
1902 s;
1903 }));
1da177e4
LT		 1904 usb_put_urb (urb);
1905
1906 /* list contents may have changed */
ddc1fd6a 1907 spin_lock(&hcd_urb_list_lock);
1da177e4
LT		 1908 goto rescan;
1909 }
9a9bf406 1910 spin_unlock_irq(&hcd_urb_list_lock);
1da177e4 1911
95cf82f9 1912 /* Wait until the endpoint queue is completely empty */
455b25fb 1913 while (!list_empty (&ep->urb_list)) {
809a58b8 1914 spin_lock_irq(&hcd_urb_list_lock);
455b25fb
AS		 1915
1916 /* The list may have changed while we acquired the spinlock */
1917 urb = NULL;
1918 if (!list_empty (&ep->urb_list)) {
1919 urb = list_entry (ep->urb_list.prev, struct urb,
1920 urb_list);
1921 usb_get_urb (urb);
1922 }
809a58b8 1923 spin_unlock_irq(&hcd_urb_list_lock);
455b25fb
AS		 1924
1925 if (urb) {
1926 usb_kill_urb (urb);
1927 usb_put_urb (urb);
1928 }
1929 }
1da177e4
LT		 1930}
1931
3f0479e0 1932/**
70445ae6
RD		 1933 * usb_hcd_alloc_bandwidth - check whether a new bandwidth setting exceeds
1934 * the bus bandwidth
1935 * @udev: target &usb_device
3f0479e0
SS		 1936 * @new_config: new configuration to install
1937 * @cur_alt: the current alternate interface setting
1938 * @new_alt: alternate interface setting that is being installed
1939 *
1940 * To change configurations, pass in the new configuration in new_config,
1941 * and pass NULL for cur_alt and new_alt.
1942 *
1943 * To reset a device's configuration (put the device in the ADDRESSED state),
1944 * pass in NULL for new_config, cur_alt, and new_alt.
1945 *
1946 * To change alternate interface settings, pass in NULL for new_config,
1947 * pass in the current alternate interface setting in cur_alt,
1948 * and pass in the new alternate interface setting in new_alt.
1949 *
626f090c 1950 * Return: An error if the requested bandwidth change exceeds the
3f0479e0 1951 * bus bandwidth or host controller internal resources.
79abb1ab 1952 */
3f0479e0 1953int usb_hcd_alloc_bandwidth(struct usb_device *udev,
79abb1ab 1954 struct usb_host_config *new_config,
3f0479e0
SS		 1955 struct usb_host_interface *cur_alt,
1956 struct usb_host_interface *new_alt)
79abb1ab
SS		 1957{
1958 int num_intfs, i, j;
576a362a 1959 struct usb_host_interface *alt = NULL;
79abb1ab
SS		 1960 int ret = 0;
1961 struct usb_hcd *hcd;
1962 struct usb_host_endpoint *ep;
1963
1964 hcd = bus_to_hcd(udev->bus);
1965 if (!hcd->driver->check_bandwidth)
1966 return 0;
1967
1968 /* Configuration is being removed - set configuration 0 */
3f0479e0 1969 if (!new_config && !cur_alt) {
79abb1ab
SS		 1970 for (i = 1; i < 16; ++i) {
1971 ep = udev->ep_out[i];
1972 if (ep)
1973 hcd->driver->drop_endpoint(hcd, udev, ep);
1974 ep = udev->ep_in[i];
1975 if (ep)
1976 hcd->driver->drop_endpoint(hcd, udev, ep);
1977 }
1978 hcd->driver->check_bandwidth(hcd, udev);
1979 return 0;
1980 }
1981 /* Check if the HCD says there's enough bandwidth. Enable all endpoints
1982 * each interface's alt setting 0 and ask the HCD to check the bandwidth
1983 * of the bus. There will always be bandwidth for endpoint 0, so it's
1984 * ok to exclude it.
1985 */
1986 if (new_config) {
1987 num_intfs = new_config->desc.bNumInterfaces;
1988 /* Remove endpoints (except endpoint 0, which is always on the
1989 * schedule) from the old config from the schedule
1990 */
1991 for (i = 1; i < 16; ++i) {
1992 ep = udev->ep_out[i];
1993 if (ep) {
1994 ret = hcd->driver->drop_endpoint(hcd, udev, ep);
1995 if (ret < 0)
1996 goto reset;
1997 }
1998 ep = udev->ep_in[i];
1999 if (ep) {
2000 ret = hcd->driver->drop_endpoint(hcd, udev, ep);
2001 if (ret < 0)
2002 goto reset;
2003 }
2004 }
2005 for (i = 0; i < num_intfs; ++i) {
d837e219
SS		 2006 struct usb_host_interface *first_alt;
2007 int iface_num;
2008
2009 first_alt = &new_config->intf_cache[i]->altsetting[0];
2010 iface_num = first_alt->desc.bInterfaceNumber;
91017f9c 2011 /* Set up endpoints for alternate interface setting 0 */
d837e219 2012 alt = usb_find_alt_setting(new_config, iface_num, 0);
3f0479e0
SS		 2013 if (!alt)
2014 /* No alt setting 0? Pick the first setting. */
d837e219 2015 alt = first_alt;
3f0479e0 2016
79abb1ab
SS		 2017 for (j = 0; j < alt->desc.bNumEndpoints; j++) {
2018 ret = hcd->driver->add_endpoint(hcd, udev, &alt->endpoint[j]);
2019 if (ret < 0)
2020 goto reset;
2021 }
2022 }
2023 }
3f0479e0 2024 if (cur_alt && new_alt) {
04a723ea
SS		 2025 struct usb_interface *iface = usb_ifnum_to_if(udev,
2026 cur_alt->desc.bInterfaceNumber);
2027
8a9af4fd
SS		 2028 if (!iface)
2029 return -EINVAL;
04a723ea
SS		 2030 if (iface->resetting_device) {
2031 /*
2032 * The USB core just reset the device, so the xHCI host
2033 * and the device will think alt setting 0 is installed.
2034 * However, the USB core will pass in the alternate
2035 * setting installed before the reset as cur_alt. Dig
2036 * out the alternate setting 0 structure, or the first
2037 * alternate setting if a broken device doesn't have alt
2038 * setting 0.
2039 */
2040 cur_alt = usb_altnum_to_altsetting(iface, 0);
2041 if (!cur_alt)
2042 cur_alt = &iface->altsetting[0];
2043 }
2044
3f0479e0
SS		 2045 /* Drop all the endpoints in the current alt setting */
2046 for (i = 0; i < cur_alt->desc.bNumEndpoints; i++) {
2047 ret = hcd->driver->drop_endpoint(hcd, udev,
2048 &cur_alt->endpoint[i]);
2049 if (ret < 0)
2050 goto reset;
2051 }
2052 /* Add all the endpoints in the new alt setting */
2053 for (i = 0; i < new_alt->desc.bNumEndpoints; i++) {
2054 ret = hcd->driver->add_endpoint(hcd, udev,
2055 &new_alt->endpoint[i]);
2056 if (ret < 0)
2057 goto reset;
2058 }
2059 }
79abb1ab
SS		 2060 ret = hcd->driver->check_bandwidth(hcd, udev);
2061reset:
2062 if (ret < 0)
2063 hcd->driver->reset_bandwidth(hcd, udev);
2064 return ret;
2065}
2066
95cf82f9
AS		 2067/* Disables the endpoint: synchronizes with the hcd to make sure all
2068 * endpoint state is gone from hardware. usb_hcd_flush_endpoint() must
2069 * have been called previously. Use for set_configuration, set_interface,
2070 * driver removal, physical disconnect.
2071 *
2072 * example: a qh stored in ep->hcpriv, holding state related to endpoint
2073 * type, maxpacket size, toggle, halt status, and scheduling.
2074 */
2075void usb_hcd_disable_endpoint(struct usb_device *udev,
2076 struct usb_host_endpoint *ep)
2077{
2078 struct usb_hcd *hcd;
2079
2080 might_sleep();
2081 hcd = bus_to_hcd(udev->bus);
2082 if (hcd->driver->endpoint_disable)
2083 hcd->driver->endpoint_disable(hcd, ep);
2084}
2085
3444b26a
DV		 2086/**
2087 * usb_hcd_reset_endpoint - reset host endpoint state
2088 * @udev: USB device.
2089 * @ep: the endpoint to reset.
2090 *
2091 * Resets any host endpoint state such as the toggle bit, sequence
2092 * number and current window.
2093 */
2094void usb_hcd_reset_endpoint(struct usb_device *udev,
2095 struct usb_host_endpoint *ep)
2096{
2097 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2098
2099 if (hcd->driver->endpoint_reset)
2100 hcd->driver->endpoint_reset(hcd, ep);
2101 else {
2102 int epnum = usb_endpoint_num(&ep->desc);
2103 int is_out = usb_endpoint_dir_out(&ep->desc);
2104 int is_control = usb_endpoint_xfer_control(&ep->desc);
2105
2106 usb_settoggle(udev, epnum, is_out, 0);
2107 if (is_control)
2108 usb_settoggle(udev, epnum, !is_out, 0);
2109 }
2110}
2111
eab1cafc
SS		 2112/**
2113 * usb_alloc_streams - allocate bulk endpoint stream IDs.
2114 * @interface: alternate setting that includes all endpoints.
2115 * @eps: array of endpoints that need streams.
2116 * @num_eps: number of endpoints in the array.
2117 * @num_streams: number of streams to allocate.
2118 * @mem_flags: flags hcd should use to allocate memory.
2119 *
626f090c 2120 * Sets up a group of bulk endpoints to have @num_streams stream IDs available.
eab1cafc
SS		 2121 * Drivers may queue multiple transfers to different stream IDs, which may
2122 * complete in a different order than they were queued.
626f090c
YB		 2123 *
2124 * Return: On success, the number of allocated streams. On failure, a negative
2125 * error code.
eab1cafc
SS		 2126 */
2127int usb_alloc_streams(struct usb_interface *interface,
2128 struct usb_host_endpoint **eps, unsigned int num_eps,
2129 unsigned int num_streams, gfp_t mem_flags)
2130{
2131 struct usb_hcd *hcd;
2132 struct usb_device *dev;
8d4f70b2 2133 int i, ret;
eab1cafc
SS		 2134
2135 dev = interface_to_usbdev(interface);
2136 hcd = bus_to_hcd(dev->bus);
2137 if (!hcd->driver->alloc_streams || !hcd->driver->free_streams)
2138 return -EINVAL;
8a1b2725 2139 if (dev->speed < USB_SPEED_SUPER)
eab1cafc 2140 return -EINVAL;
90a646c7
HG		 2141 if (dev->state < USB_STATE_CONFIGURED)
2142 return -ENODEV;
eab1cafc 2143
8d4f70b2
HG		 2144 for (i = 0; i < num_eps; i++) {
2145 /* Streams only apply to bulk endpoints. */
eab1cafc
SS		 2146 if (!usb_endpoint_xfer_bulk(&eps[i]->desc))
2147 return -EINVAL;
8d4f70b2
HG		 2148 /* Re-alloc is not allowed */
2149 if (eps[i]->streams)
2150 return -EINVAL;
2151 }
eab1cafc 2152
8d4f70b2 2153 ret = hcd->driver->alloc_streams(hcd, dev, eps, num_eps,
eab1cafc 2154 num_streams, mem_flags);
8d4f70b2
HG		 2155 if (ret < 0)
2156 return ret;
2157
2158 for (i = 0; i < num_eps; i++)
2159 eps[i]->streams = ret;
2160
2161 return ret;
eab1cafc
SS		 2162}
2163EXPORT_SYMBOL_GPL(usb_alloc_streams);
2164
2165/**
2166 * usb_free_streams - free bulk endpoint stream IDs.
2167 * @interface: alternate setting that includes all endpoints.
2168 * @eps: array of endpoints to remove streams from.
2169 * @num_eps: number of endpoints in the array.
2170 * @mem_flags: flags hcd should use to allocate memory.
2171 *
2172 * Reverts a group of bulk endpoints back to not using stream IDs.
2173 * Can fail if we are given bad arguments, or HCD is broken.
6c74dada 2174 *
12d4bbce 2175 * Return: 0 on success. On failure, a negative error code.
eab1cafc 2176 */
6c74dada 2177int usb_free_streams(struct usb_interface *interface,
eab1cafc
SS		 2178 struct usb_host_endpoint **eps, unsigned int num_eps,
2179 gfp_t mem_flags)
2180{
2181 struct usb_hcd *hcd;
2182 struct usb_device *dev;
8d4f70b2 2183 int i, ret;
eab1cafc
SS		 2184
2185 dev = interface_to_usbdev(interface);
2186 hcd = bus_to_hcd(dev->bus);
8a1b2725 2187 if (dev->speed < USB_SPEED_SUPER)
6c74dada 2188 return -EINVAL;
eab1cafc 2189
8d4f70b2 2190 /* Double-free is not allowed */
eab1cafc 2191 for (i = 0; i < num_eps; i++)
8d4f70b2 2192 if (!eps[i] || !eps[i]->streams)
6c74dada 2193 return -EINVAL;
eab1cafc 2194
8d4f70b2
HG		 2195 ret = hcd->driver->free_streams(hcd, dev, eps, num_eps, mem_flags);
2196 if (ret < 0)
2197 return ret;
2198
2199 for (i = 0; i < num_eps; i++)
2200 eps[i]->streams = 0;
2201
2202 return ret;
eab1cafc
SS		 2203}
2204EXPORT_SYMBOL_GPL(usb_free_streams);
2205
cde217a5
AS		 2206/* Protect against drivers that try to unlink URBs after the device
2207 * is gone, by waiting until all unlinks for @udev are finished.
2208 * Since we don't currently track URBs by device, simply wait until
2209 * nothing is running in the locked region of usb_hcd_unlink_urb().
2210 */
2211void usb_hcd_synchronize_unlinks(struct usb_device *udev)
2212{
2213 spin_lock_irq(&hcd_urb_unlink_lock);
2214 spin_unlock_irq(&hcd_urb_unlink_lock);
2215}
2216
1da177e4
LT		 2217/*-------------------------------------------------------------------------*/
2218
32aca560
AS		 2219/* called in any context */
2220int usb_hcd_get_frame_number (struct usb_device *udev)
2221{
2222 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2223
9b37596a 2224 if (!HCD_RH_RUNNING(hcd))
32aca560
AS		 2225 return -ESHUTDOWN;
2226 return hcd->driver->get_frame_number (hcd);
2227}
2228
2229/*-------------------------------------------------------------------------*/
2230
9293677a 2231#ifdef CONFIG_PM
1da177e4 2232
65bfd296 2233int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)
1da177e4 2234{
6ae706ae 2235 struct usb_hcd *hcd = bus_to_hcd(rhdev->bus);
686314cf
AS		 2236 int status;
2237 int old_state = hcd->state;
1da177e4 2238
30b1a7a3
AS		 2239 dev_dbg(&rhdev->dev, "bus %ssuspend, wakeup %d\n",
2240 (PMSG_IS_AUTO(msg) ? "auto-" : ""),
2241 rhdev->do_remote_wakeup);
9b37596a
AS		 2242 if (HCD_DEAD(hcd)) {
2243 dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "suspend");
2244 return 0;
2245 }
2246
686314cf
AS		 2247 if (!hcd->driver->bus_suspend) {
2248 status = -ENOENT;
2249 } else {
9b37596a 2250 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
686314cf
AS		 2251 hcd->state = HC_STATE_QUIESCING;
2252 status = hcd->driver->bus_suspend(hcd);
2253 }
2254 if (status == 0) {
2255 usb_set_device_state(rhdev, USB_STATE_SUSPENDED);
9293677a 2256 hcd->state = HC_STATE_SUSPENDED;
879d38e6
AS		 2257
2258 /* Did we race with a root-hub wakeup event? */
2259 if (rhdev->do_remote_wakeup) {
2260 char buffer[6];
2261
2262 status = hcd->driver->hub_status_data(hcd, buffer);
2263 if (status != 0) {
2264 dev_dbg(&rhdev->dev, "suspend raced with wakeup event\n");
2265 hcd_bus_resume(rhdev, PMSG_AUTO_RESUME);
2266 status = -EBUSY;
2267 }
2268 }
686314cf 2269 } else {
9b37596a
AS		 2270 spin_lock_irq(&hcd_root_hub_lock);
2271 if (!HCD_DEAD(hcd)) {
2272 set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2273 hcd->state = old_state;
2274 }
2275 spin_unlock_irq(&hcd_root_hub_lock);
686314cf 2276 dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
9293677a 2277 "suspend", status);
686314cf 2278 }
9293677a 2279 return status;
1da177e4
LT		 2280}
2281
65bfd296 2282int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
1da177e4 2283{
6ae706ae 2284 struct usb_hcd *hcd = bus_to_hcd(rhdev->bus);
686314cf 2285 int status;
cfa59dab 2286 int old_state = hcd->state;
1da177e4 2287
30b1a7a3
AS		 2288 dev_dbg(&rhdev->dev, "usb %sresume\n",
2289 (PMSG_IS_AUTO(msg) ? "auto-" : ""));
9b37596a
AS		 2290 if (HCD_DEAD(hcd)) {
2291 dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "resume");
2292 return 0;
2293 }
0c0382e3 2294 if (!hcd->driver->bus_resume)
9293677a 2295 return -ENOENT;
9b37596a 2296 if (HCD_RH_RUNNING(hcd))
979d5199 2297 return 0;
686314cf 2298
9293677a 2299 hcd->state = HC_STATE_RESUMING;
686314cf 2300 status = hcd->driver->bus_resume(hcd);
bf3d7d40 2301 clear_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
686314cf 2302 if (status == 0) {
bfd1e910
AS		 2303 struct usb_device *udev;
2304 int port1;
2305
9b37596a
AS		 2306 spin_lock_irq(&hcd_root_hub_lock);
2307 if (!HCD_DEAD(hcd)) {
2308 usb_set_device_state(rhdev, rhdev->actconfig
2309 ? USB_STATE_CONFIGURED
2310 : USB_STATE_ADDRESS);
2311 set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2312 hcd->state = HC_STATE_RUNNING;
2313 }
2314 spin_unlock_irq(&hcd_root_hub_lock);
bfd1e910
AS		 2315
2316 /*
2317 * Check whether any of the enabled ports on the root hub are
2318 * unsuspended. If they are then a TRSMRCY delay is needed
2319 * (this is what the USB-2 spec calls a "global resume").
2320 * Otherwise we can skip the delay.
2321 */
2322 usb_hub_for_each_child(rhdev, port1, udev) {
2323 if (udev->state != USB_STATE_NOTATTACHED &&
2324 !udev->port_is_suspended) {
2325 usleep_range(10000, 11000); /* TRSMRCY */
2326 break;
2327 }
2328 }
686314cf 2329 } else {
cfa59dab 2330 hcd->state = old_state;
686314cf 2331 dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
9293677a 2332 "resume", status);
cfa59dab
AS		 2333 if (status != -ESHUTDOWN)
2334 usb_hc_died(hcd);
9293677a
DB		 2335 }
2336 return status;
1da177e4
LT		 2337}
2338
6b157c9b
AS		 2339/* Workqueue routine for root-hub remote wakeup */
2340static void hcd_resume_work(struct work_struct *work)
2341{
2342 struct usb_hcd *hcd = container_of(work, struct usb_hcd, wakeup_work);
2343 struct usb_device *udev = hcd->self.root_hub;
2344
0534d468 2345 usb_remote_wakeup(udev);
6b157c9b
AS		 2346}
2347
1da177e4 2348/**
14557359 2349 * usb_hcd_resume_root_hub - called by HCD to resume its root hub
1da177e4
LT		 2350 * @hcd: host controller for this root hub
2351 *
2352 * The USB host controller calls this function when its root hub is
2353 * suspended (with the remote wakeup feature enabled) and a remote
6b157c9b
AS		 2354 * wakeup request is received. The routine submits a workqueue request
2355 * to resume the root hub (that is, manage its downstream ports again).
1da177e4
LT		 2356 */
2357void usb_hcd_resume_root_hub (struct usb_hcd *hcd)
2358{
2359 unsigned long flags;
2360
2361 spin_lock_irqsave (&hcd_root_hub_lock, flags);
ff2f0787
AS		 2362 if (hcd->rh_registered) {
2363 set_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
9bbdf1e0 2364 queue_work(pm_wq, &hcd->wakeup_work);
ff2f0787 2365 }
1da177e4
LT		 2366 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
2367}
9293677a 2368EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub);
1da177e4 2369
ceb6c9c8 2370#endif /* CONFIG_PM */
1da177e4
LT		 2371
2372/*-------------------------------------------------------------------------*/
2373
2374#ifdef CONFIG_USB_OTG
2375
2376/**
2377 * usb_bus_start_enum - start immediate enumeration (for OTG)
2378 * @bus: the bus (must use hcd framework)
2379 * @port_num: 1-based number of port; usually bus->otg_port
2380 * Context: in_interrupt()
2381 *
2382 * Starts enumeration, with an immediate reset followed later by
37ebb549 2383 * hub_wq identifying and possibly configuring the device.
1da177e4
LT		 2384 * This is needed by OTG controller drivers, where it helps meet
2385 * HNP protocol timing requirements for starting a port reset.
626f090c
YB		 2386 *
2387 * Return: 0 if successful.
1da177e4
LT		 2388 */
2389int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num)
2390{
2391 struct usb_hcd *hcd;
2392 int status = -EOPNOTSUPP;
2393
2394 /* NOTE: since HNP can't start by grabbing the bus's address0_sem,
2395 * boards with root hubs hooked up to internal devices (instead of
2396 * just the OTG port) may need more attention to resetting...
2397 */
6ae706ae 2398 hcd = bus_to_hcd(bus);
1da177e4
LT		 2399 if (port_num && hcd->driver->start_port_reset)
2400 status = hcd->driver->start_port_reset(hcd, port_num);
2401
37ebb549 2402 /* allocate hub_wq shortly after (first) root port reset finishes;
1da177e4
LT		 2403 * it may issue others, until at least 50 msecs have passed.
2404 */
2405 if (status == 0)
2406 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10));
2407 return status;
2408}
782e70c6 2409EXPORT_SYMBOL_GPL(usb_bus_start_enum);
1da177e4
LT		 2410
2411#endif
2412
2413/*-------------------------------------------------------------------------*/
2414
1da177e4
LT		 2415/**
2416 * usb_hcd_irq - hook IRQs to HCD framework (bus glue)
2417 * @irq: the IRQ being raised
2418 * @__hcd: pointer to the HCD whose IRQ is being signaled
1da177e4
LT		 2419 *
2420 * If the controller isn't HALTed, calls the driver's irq handler.
2421 * Checks whether the controller is now dead.
626f090c
YB		 2422 *
2423 * Return: %IRQ_HANDLED if the IRQ was handled. %IRQ_NONE otherwise.
1da177e4 2424 */
7d12e780 2425irqreturn_t usb_hcd_irq (int irq, void *__hcd)
1da177e4
LT		 2426{
2427 struct usb_hcd *hcd = __hcd;
de85422b 2428 irqreturn_t rc;
1da177e4 2429
968b822c 2430 if (unlikely(HCD_DEAD(hcd) || !HCD_HW_ACCESSIBLE(hcd)))
de85422b 2431 rc = IRQ_NONE;
968b822c 2432 else if (hcd->driver->irq(hcd) == IRQ_NONE)
de85422b 2433 rc = IRQ_NONE;
968b822c 2434 else
de85422b 2435 rc = IRQ_HANDLED;
de85422b 2436
de85422b 2437 return rc;
1da177e4 2438}
43b86af8 2439EXPORT_SYMBOL_GPL(usb_hcd_irq);
1da177e4
LT		 2440
2441/*-------------------------------------------------------------------------*/
2442
2443/**
2444 * usb_hc_died - report abnormal shutdown of a host controller (bus glue)
2445 * @hcd: pointer to the HCD representing the controller
2446 *
2447 * This is called by bus glue to report a USB host controller that died
2448 * while operations may still have been pending. It's called automatically
c5635437
SS		 2449 * by the PCI glue, so only glue for non-PCI busses should need to call it.
2450 *
2451 * Only call this function with the primary HCD.
1da177e4
LT		 2452 */
2453void usb_hc_died (struct usb_hcd *hcd)
2454{
2455 unsigned long flags;
2456
2457 dev_err (hcd->self.controller, "HC died; cleaning up\n");
2458
2459 spin_lock_irqsave (&hcd_root_hub_lock, flags);
9b37596a
AS		 2460 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2461 set_bit(HCD_FLAG_DEAD, &hcd->flags);
1da177e4 2462 if (hcd->rh_registered) {
541c7d43 2463 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
1da177e4 2464
37ebb549 2465 /* make hub_wq clean up old urbs and devices */
1da177e4
LT		 2466 usb_set_device_state (hcd->self.root_hub,
2467 USB_STATE_NOTATTACHED);
59d48b3f 2468 usb_kick_hub_wq(hcd->self.root_hub);
1da177e4 2469 }
c5635437
SS		 2470 if (usb_hcd_is_primary_hcd(hcd) && hcd->shared_hcd) {
2471 hcd = hcd->shared_hcd;
2472 if (hcd->rh_registered) {
2473 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2474
37ebb549 2475 /* make hub_wq clean up old urbs and devices */
c5635437
SS		 2476 usb_set_device_state(hcd->self.root_hub,
2477 USB_STATE_NOTATTACHED);
59d48b3f 2478 usb_kick_hub_wq(hcd->self.root_hub);
c5635437
SS		 2479 }
2480 }
1da177e4 2481 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
c5635437 2482 /* Make sure that the other roothub is also deallocated. */
1da177e4
LT		 2483}
2484EXPORT_SYMBOL_GPL (usb_hc_died);
2485
2486/*-------------------------------------------------------------------------*/
2487
94dfd7ed
ML		 2488static void init_giveback_urb_bh(struct giveback_urb_bh *bh)
2489{
2490
2491 spin_lock_init(&bh->lock);
2492 INIT_LIST_HEAD(&bh->head);
2493 tasklet_init(&bh->bh, usb_giveback_urb_bh, (unsigned long)bh);
2494}
2495
1da177e4 2496/**
c5635437 2497 * usb_create_shared_hcd - create and initialize an HCD structure
1da177e4
LT		 2498 * @driver: HC driver that will use this hcd
2499 * @dev: device for this HC, stored in hcd->self.controller
2500 * @bus_name: value to store in hcd->self.bus_name
c5635437
SS		 2501 * @primary_hcd: a pointer to the usb_hcd structure that is sharing the
2502 * PCI device. Only allocate certain resources for the primary HCD
1da177e4
LT		 2503 * Context: !in_interrupt()
2504 *
2505 * Allocate a struct usb_hcd, with extra space at the end for the
2506 * HC driver's private data. Initialize the generic members of the
2507 * hcd structure.
2508 *
626f090c
YB		 2509 * Return: On success, a pointer to the created and initialized HCD structure.
2510 * On failure (e.g. if memory is unavailable), %NULL.
1da177e4 2511 */
c5635437
SS		 2512struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
2513 struct device *dev, const char *bus_name,
2514 struct usb_hcd *primary_hcd)
1da177e4
LT		 2515{
2516 struct usb_hcd *hcd;
2517
7b842b6e 2518 hcd = kzalloc(sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL);
1da177e4
LT		 2519 if (!hcd) {
2520 dev_dbg (dev, "hcd alloc failed\n");
2521 return NULL;
2522 }
c5635437
SS		 2523 if (primary_hcd == NULL) {
2524 hcd->bandwidth_mutex = kmalloc(sizeof(*hcd->bandwidth_mutex),
2525 GFP_KERNEL);
2526 if (!hcd->bandwidth_mutex) {
2527 kfree(hcd);
2528 dev_dbg(dev, "hcd bandwidth mutex alloc failed\n");
2529 return NULL;
2530 }
2531 mutex_init(hcd->bandwidth_mutex);
2532 dev_set_drvdata(dev, hcd);
2533 } else {
d8521afe 2534 mutex_lock(&usb_port_peer_mutex);
c5635437
SS		 2535 hcd->bandwidth_mutex = primary_hcd->bandwidth_mutex;
2536 hcd->primary_hcd = primary_hcd;
2537 primary_hcd->primary_hcd = primary_hcd;
2538 hcd->shared_hcd = primary_hcd;
2539 primary_hcd->shared_hcd = hcd;
d8521afe 2540 mutex_unlock(&usb_port_peer_mutex);
d673bfcb 2541 }
d673bfcb 2542
17200583 2543 kref_init(&hcd->kref);
1da177e4
LT		 2544
2545 usb_bus_init(&hcd->self);
1da177e4
LT		 2546 hcd->self.controller = dev;
2547 hcd->self.bus_name = bus_name;
dd990f16 2548 hcd->self.uses_dma = (dev->dma_mask != NULL);
1da177e4
LT		 2549
2550 init_timer(&hcd->rh_timer);
d5926ae7
AS		 2551 hcd->rh_timer.function = rh_timer_func;
2552 hcd->rh_timer.data = (unsigned long) hcd;
ceb6c9c8 2553#ifdef CONFIG_PM
6b157c9b
AS		 2554 INIT_WORK(&hcd->wakeup_work, hcd_resume_work);
2555#endif
1da177e4
LT		 2556
2557 hcd->driver = driver;
83de4b2b 2558 hcd->speed = driver->flags & HCD_MASK;
1da177e4
LT		 2559 hcd->product_desc = (driver->product_desc) ? driver->product_desc :
2560 "USB Host Controller";
1da177e4
LT		 2561 return hcd;
2562}
c5635437
SS		 2563EXPORT_SYMBOL_GPL(usb_create_shared_hcd);
2564
2565/**
2566 * usb_create_hcd - create and initialize an HCD structure
2567 * @driver: HC driver that will use this hcd
2568 * @dev: device for this HC, stored in hcd->self.controller
2569 * @bus_name: value to store in hcd->self.bus_name
2570 * Context: !in_interrupt()
2571 *
2572 * Allocate a struct usb_hcd, with extra space at the end for the
2573 * HC driver's private data. Initialize the generic members of the
2574 * hcd structure.
2575 *
626f090c
YB		 2576 * Return: On success, a pointer to the created and initialized HCD
2577 * structure. On failure (e.g. if memory is unavailable), %NULL.
c5635437
SS		 2578 */
2579struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
2580 struct device *dev, const char *bus_name)
2581{
2582 return usb_create_shared_hcd(driver, dev, bus_name, NULL);
2583}
782e70c6 2584EXPORT_SYMBOL_GPL(usb_create_hcd);
1da177e4 2585
c5635437
SS		 2586/*
2587 * Roothubs that share one PCI device must also share the bandwidth mutex.
2588 * Don't deallocate the bandwidth_mutex until the last shared usb_hcd is
2589 * deallocated.
2590 *
2591 * Make sure to only deallocate the bandwidth_mutex when the primary HCD is
d8521afe
DW		 2592 * freed. When hcd_release() is called for either hcd in a peer set
2593 * invalidate the peer's ->shared_hcd and ->primary_hcd pointers to
2594 * block new peering attempts
c5635437 2595 */
d8521afe 2596static void hcd_release(struct kref *kref)
17200583
AS		 2597{
2598 struct usb_hcd *hcd = container_of (kref, struct usb_hcd, kref);
2599
d8521afe 2600 mutex_lock(&usb_port_peer_mutex);
c5635437
SS		 2601 if (usb_hcd_is_primary_hcd(hcd))
2602 kfree(hcd->bandwidth_mutex);
d8521afe
DW		 2603 if (hcd->shared_hcd) {
2604 struct usb_hcd *peer = hcd->shared_hcd;
2605
2606 peer->shared_hcd = NULL;
2607 if (peer->primary_hcd == hcd)
2608 peer->primary_hcd = NULL;
2609 }
2610 mutex_unlock(&usb_port_peer_mutex);
17200583
AS		 2611 kfree(hcd);
2612}
2613
2614struct usb_hcd *usb_get_hcd (struct usb_hcd *hcd)
2615{
2616 if (hcd)
2617 kref_get (&hcd->kref);
2618 return hcd;
2619}
782e70c6 2620EXPORT_SYMBOL_GPL(usb_get_hcd);
17200583 2621
1da177e4
LT		 2622void usb_put_hcd (struct usb_hcd *hcd)
2623{
17200583
AS		 2624 if (hcd)
2625 kref_put (&hcd->kref, hcd_release);
1da177e4 2626}
782e70c6 2627EXPORT_SYMBOL_GPL(usb_put_hcd);
1da177e4 2628
c5635437
SS		 2629int usb_hcd_is_primary_hcd(struct usb_hcd *hcd)
2630{
2631 if (!hcd->primary_hcd)
2632 return 1;
2633 return hcd == hcd->primary_hcd;
2634}
2635EXPORT_SYMBOL_GPL(usb_hcd_is_primary_hcd);
2636
3f5eb141
LT		 2637int usb_hcd_find_raw_port_number(struct usb_hcd *hcd, int port1)
2638{
2639 if (!hcd->driver->find_raw_port_number)
2640 return port1;
2641
2642 return hcd->driver->find_raw_port_number(hcd, port1);
2643}
2644
23e0d106
SS		 2645static int usb_hcd_request_irqs(struct usb_hcd *hcd,
2646 unsigned int irqnum, unsigned long irqflags)
2647{
2648 int retval;
2649
2650 if (hcd->driver->irq) {
e592c5d0 2651
23e0d106
SS		 2652 snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d",
2653 hcd->driver->description, hcd->self.busnum);
2654 retval = request_irq(irqnum, &usb_hcd_irq, irqflags,
2655 hcd->irq_descr, hcd);
2656 if (retval != 0) {
2657 dev_err(hcd->self.controller,
2658 "request interrupt %d failed\n",
2659 irqnum);
2660 return retval;
2661 }
2662 hcd->irq = irqnum;
2663 dev_info(hcd->self.controller, "irq %d, %s 0x%08llx\n", irqnum,
2664 (hcd->driver->flags & HCD_MEMORY) ?
2665 "io mem" : "io base",
2666 (unsigned long long)hcd->rsrc_start);
2667 } else {
cd70469d 2668 hcd->irq = 0;
23e0d106
SS		 2669 if (hcd->rsrc_start)
2670 dev_info(hcd->self.controller, "%s 0x%08llx\n",
2671 (hcd->driver->flags & HCD_MEMORY) ?
2672 "io mem" : "io base",
2673 (unsigned long long)hcd->rsrc_start);
2674 }
2675 return 0;
2676}
2677
d8521afe
DW		 2678/*
2679 * Before we free this root hub, flush in-flight peering attempts
2680 * and disable peer lookups
2681 */
2682static void usb_put_invalidate_rhdev(struct usb_hcd *hcd)
2683{
2684 struct usb_device *rhdev;
2685
2686 mutex_lock(&usb_port_peer_mutex);
2687 rhdev = hcd->self.root_hub;
2688 hcd->self.root_hub = NULL;
2689 mutex_unlock(&usb_port_peer_mutex);
2690 usb_put_dev(rhdev);
2691}
2692
1da177e4
LT		 2693/**
2694 * usb_add_hcd - finish generic HCD structure initialization and register
2695 * @hcd: the usb_hcd structure to initialize
2696 * @irqnum: Interrupt line to allocate
2697 * @irqflags: Interrupt type flags
2698 *
2699 * Finish the remaining parts of generic HCD initialization: allocate the
2700 * buffers of consistent memory, register the bus, request the IRQ line,
2701 * and call the driver's reset() and start() routines.
2702 */
2703int usb_add_hcd(struct usb_hcd *hcd,
2704 unsigned int irqnum, unsigned long irqflags)
2705{
8ec8d20b
AS		 2706 int retval;
2707 struct usb_device *rhdev;
1da177e4 2708
3d46e73d 2709 if (IS_ENABLED(CONFIG_USB_PHY) && !hcd->usb_phy) {
1ae5799e
VB		 2710 struct usb_phy *phy = usb_get_phy_dev(hcd->self.controller, 0);
2711
2712 if (IS_ERR(phy)) {
2713 retval = PTR_ERR(phy);
2714 if (retval == -EPROBE_DEFER)
2715 return retval;
2716 } else {
2717 retval = usb_phy_init(phy);
2718 if (retval) {
2719 usb_put_phy(phy);
2720 return retval;
2721 }
3d46e73d 2722 hcd->usb_phy = phy;
1ae5799e
VB		 2723 hcd->remove_phy = 1;
2724 }
2725 }
2726
ef44cb42 2727 if (IS_ENABLED(CONFIG_GENERIC_PHY) && !hcd->phy) {
00433254
SS		 2728 struct phy *phy = phy_get(hcd->self.controller, "usb");
2729
2730 if (IS_ERR(phy)) {
2731 retval = PTR_ERR(phy);
2732 if (retval == -EPROBE_DEFER)
2733 goto err_phy;
2734 } else {
2735 retval = phy_init(phy);
2736 if (retval) {
2737 phy_put(phy);
2738 goto err_phy;
2739 }
2740 retval = phy_power_on(phy);
2741 if (retval) {
2742 phy_exit(phy);
2743 phy_put(phy);
2744 goto err_phy;
2745 }
2746 hcd->phy = phy;
ef44cb42 2747 hcd->remove_phy = 1;
00433254
SS		 2748 }
2749 }
2750
1da177e4
LT		 2751 dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
2752
c4fc2342 2753 /* Keep old behaviour if authorized_default is not in [0, 1]. */
ff8e2c56
SK		 2754 if (authorized_default < 0 || authorized_default > 1) {
2755 if (hcd->wireless)
2756 clear_bit(HCD_FLAG_DEV_AUTHORIZED, &hcd->flags);
2757 else
2758 set_bit(HCD_FLAG_DEV_AUTHORIZED, &hcd->flags);
2759 } else {
2760 if (authorized_default)
2761 set_bit(HCD_FLAG_DEV_AUTHORIZED, &hcd->flags);
2762 else
2763 clear_bit(HCD_FLAG_DEV_AUTHORIZED, &hcd->flags);
2764 }
8de98402
BH		 2765 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2766
6b2bd3c8
SK		 2767 /* per default all interfaces are authorized */
2768 set_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
2769
b1e8f0a6 2770 /* HC is in reset state, but accessible. Now do the one-time init,
37ebb549 2771 * bottom up so that hcds can customize the root hubs before hub_wq
b1e8f0a6
DB		 2772 * starts talking to them. (Note, bus id is assigned early too.)
2773 */
0faaad46
KB		 2774 retval = hcd_buffer_create(hcd);
2775 if (retval != 0) {
1da177e4 2776 dev_dbg(hcd->self.controller, "pool alloc failed\n");
00433254 2777 goto err_create_buf;
1da177e4
LT		 2778 }
2779
0faaad46
KB		 2780 retval = usb_register_bus(&hcd->self);
2781 if (retval < 0)
8ec8d20b 2782 goto err_register_bus;
1da177e4 2783
c688d621
GKH		 2784 rhdev = usb_alloc_dev(NULL, &hcd->self, 0);
2785 if (rhdev == NULL) {
b1e8f0a6
DB		 2786 dev_err(hcd->self.controller, "unable to allocate root hub\n");
2787 retval = -ENOMEM;
2788 goto err_allocate_root_hub;
2789 }
d8521afe 2790 mutex_lock(&usb_port_peer_mutex);
6d88e679 2791 hcd->self.root_hub = rhdev;
d8521afe 2792 mutex_unlock(&usb_port_peer_mutex);
6b403b02 2793
83de4b2b 2794 switch (hcd->speed) {
6b403b02
SS		 2795 case HCD_USB11:
2796 rhdev->speed = USB_SPEED_FULL;
2797 break;
2798 case HCD_USB2:
2799 rhdev->speed = USB_SPEED_HIGH;
2800 break;
1a81f881
TP		 2801 case HCD_USB25:
2802 rhdev->speed = USB_SPEED_WIRELESS;
2803 break;
6b403b02
SS		 2804 case HCD_USB3:
2805 rhdev->speed = USB_SPEED_SUPER;
2806 break;
5f9c3a66
MN		 2807 case HCD_USB31:
2808 rhdev->speed = USB_SPEED_SUPER_PLUS;
2809 break;
6b403b02 2810 default:
1d15ee4c 2811 retval = -EINVAL;
96e077ae 2812 goto err_set_rh_speed;
6b403b02 2813 }
b1e8f0a6 2814
db4cefaa
DB		 2815 /* wakeup flag init defaults to "everything works" for root hubs,
2816 * but drivers can override it in reset() if needed, along with
2817 * recording the overall controller's system wakeup capability.
2818 */
a6eeeb9f 2819 device_set_wakeup_capable(&rhdev->dev, 1);
db4cefaa 2820
9b37596a
AS		 2821 /* HCD_FLAG_RH_RUNNING doesn't matter until the root hub is
2822 * registered. But since the controller can die at any time,
2823 * let's initialize the flag before touching the hardware.
2824 */
2825 set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2826
b1e8f0a6
DB		 2827 /* "reset" is misnamed; its role is now one-time init. the controller
2828 * should already have been reset (and boot firmware kicked off etc).
2829 */
0faaad46
KB		 2830 if (hcd->driver->reset) {
2831 retval = hcd->driver->reset(hcd);
2832 if (retval < 0) {
2833 dev_err(hcd->self.controller, "can't setup: %d\n",
2834 retval);
2835 goto err_hcd_driver_setup;
2836 }
b1e8f0a6 2837 }
6d88e679 2838 hcd->rh_pollable = 1;
b1e8f0a6 2839
fb669cc0
DB		 2840 /* NOTE: root hub and controller capabilities may not be the same */
2841 if (device_can_wakeup(hcd->self.controller)
2842 && device_can_wakeup(&hcd->self.root_hub->dev))
b1e8f0a6 2843 dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
b1e8f0a6 2844
94dfd7ed
ML		 2845 /* initialize tasklets */
2846 init_giveback_urb_bh(&hcd->high_prio_bh);
2847 init_giveback_urb_bh(&hcd->low_prio_bh);
2848
68d07f64
SS		 2849 /* enable irqs just before we start the controller,
2850 * if the BIOS provides legacy PCI irqs.
2851 */
2852 if (usb_hcd_is_primary_hcd(hcd) && irqnum) {
c5635437
SS		 2853 retval = usb_hcd_request_irqs(hcd, irqnum, irqflags);
2854 if (retval)
2855 goto err_request_irq;
2856 }
1da177e4 2857
4814030c 2858 hcd->state = HC_STATE_RUNNING;
abc4f9b0
SS		 2859 retval = hcd->driver->start(hcd);
2860 if (retval < 0) {
1da177e4 2861 dev_err(hcd->self.controller, "startup error %d\n", retval);
8ec8d20b 2862 goto err_hcd_driver_start;
1da177e4
LT		 2863 }
2864
b1e8f0a6 2865 /* starting here, usbcore will pay attention to this root hub */
0faaad46
KB		 2866 retval = register_root_hub(hcd);
2867 if (retval != 0)
8ec8d20b
AS		 2868 goto err_register_root_hub;
2869
5234ce1b
IPG		 2870 retval = sysfs_create_group(&rhdev->dev.kobj, &usb_bus_attr_group);
2871 if (retval < 0) {
2872 printk(KERN_ERR "Cannot register USB bus sysfs attributes: %d\n",
2873 retval);
2874 goto error_create_attr_group;
2875 }
541c7d43 2876 if (hcd->uses_new_polling && HCD_POLL_RH(hcd))
d5926ae7 2877 usb_hcd_poll_rh_status(hcd);
a6eeeb9f 2878
1da177e4
LT		 2879 return retval;
2880
5234ce1b 2881error_create_attr_group:
9b37596a 2882 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
96e077ae
AS		 2883 if (HC_IS_RUNNING(hcd->state))
2884 hcd->state = HC_STATE_QUIESCING;
2885 spin_lock_irq(&hcd_root_hub_lock);
2886 hcd->rh_registered = 0;
2887 spin_unlock_irq(&hcd_root_hub_lock);
2888
ceb6c9c8 2889#ifdef CONFIG_PM
96e077ae
AS		 2890 cancel_work_sync(&hcd->wakeup_work);
2891#endif
a4b5d606 2892 mutex_lock(&usb_bus_idr_lock);
6d88e679 2893 usb_disconnect(&rhdev); /* Sets rhdev to NULL */
a4b5d606 2894 mutex_unlock(&usb_bus_idr_lock);
b1e8f0a6 2895err_register_root_hub:
6d88e679 2896 hcd->rh_pollable = 0;
541c7d43 2897 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
6d88e679 2898 del_timer_sync(&hcd->rh_timer);
8ec8d20b 2899 hcd->driver->stop(hcd);
96e077ae 2900 hcd->state = HC_STATE_HALT;
541c7d43 2901 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
96e077ae 2902 del_timer_sync(&hcd->rh_timer);
b1e8f0a6 2903err_hcd_driver_start:
cd70469d 2904 if (usb_hcd_is_primary_hcd(hcd) && hcd->irq > 0)
1da177e4 2905 free_irq(irqnum, hcd);
b1e8f0a6
DB		 2906err_request_irq:
2907err_hcd_driver_setup:
96e077ae 2908err_set_rh_speed:
d8521afe 2909 usb_put_invalidate_rhdev(hcd);
b1e8f0a6 2910err_allocate_root_hub:
1da177e4 2911 usb_deregister_bus(&hcd->self);
b1e8f0a6 2912err_register_bus:
1da177e4 2913 hcd_buffer_destroy(hcd);
00433254 2914err_create_buf:
ef44cb42 2915 if (IS_ENABLED(CONFIG_GENERIC_PHY) && hcd->remove_phy && hcd->phy) {
00433254
SS		 2916 phy_power_off(hcd->phy);
2917 phy_exit(hcd->phy);
2918 phy_put(hcd->phy);
2919 hcd->phy = NULL;
2920 }
2921err_phy:
3d46e73d
AT		 2922 if (hcd->remove_phy && hcd->usb_phy) {
2923 usb_phy_shutdown(hcd->usb_phy);
2924 usb_put_phy(hcd->usb_phy);
2925 hcd->usb_phy = NULL;
103e127d 2926 }
1da177e4 2927 return retval;
14557359 2928}
782e70c6 2929EXPORT_SYMBOL_GPL(usb_add_hcd);
1da177e4
LT		 2930
2931/**
2932 * usb_remove_hcd - shutdown processing for generic HCDs
2933 * @hcd: the usb_hcd structure to remove
2934 * Context: !in_interrupt()
2935 *
2936 * Disconnects the root hub, then reverses the effects of usb_add_hcd(),
2937 * invoking the HCD's stop() method.
2938 */
2939void usb_remove_hcd(struct usb_hcd *hcd)
2940{
6d88e679
AS		 2941 struct usb_device *rhdev = hcd->self.root_hub;
2942
1da177e4
LT		 2943 dev_info(hcd->self.controller, "remove, state %x\n", hcd->state);
2944
6d88e679
AS		 2945 usb_get_dev(rhdev);
2946 sysfs_remove_group(&rhdev->dev.kobj, &usb_bus_attr_group);
96e077ae 2947
9b37596a 2948 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
1da177e4
LT		 2949 if (HC_IS_RUNNING (hcd->state))
2950 hcd->state = HC_STATE_QUIESCING;
2951
2952 dev_dbg(hcd->self.controller, "roothub graceful disconnect\n");
2953 spin_lock_irq (&hcd_root_hub_lock);
2954 hcd->rh_registered = 0;
2955 spin_unlock_irq (&hcd_root_hub_lock);
9ad3d6cc 2956
ceb6c9c8 2957#ifdef CONFIG_PM
d5d4db70 2958 cancel_work_sync(&hcd->wakeup_work);
6b157c9b
AS		 2959#endif
2960
a4b5d606 2961 mutex_lock(&usb_bus_idr_lock);
6d88e679 2962 usb_disconnect(&rhdev); /* Sets rhdev to NULL */
a4b5d606 2963 mutex_unlock(&usb_bus_idr_lock);
1da177e4 2964
94dfd7ed
ML		 2965 /*
2966 * tasklet_kill() isn't needed here because:
2967 * - driver's disconnect() called from usb_disconnect() should
2968 * make sure its URBs are completed during the disconnect()
2969 * callback
2970 *
2971 * - it is too late to run complete() here since driver may have
2972 * been removed already now
2973 */
2974
6d88e679
AS		 2975 /* Prevent any more root-hub status calls from the timer.
2976 * The HCD might still restart the timer (if a port status change
2977 * interrupt occurs), but usb_hcd_poll_rh_status() won't invoke
2978 * the hub_status_data() callback.
2979 */
2980 hcd->rh_pollable = 0;
541c7d43 2981 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
6d88e679
AS		 2982 del_timer_sync(&hcd->rh_timer);
2983
1da177e4
LT		 2984 hcd->driver->stop(hcd);
2985 hcd->state = HC_STATE_HALT;
2986
6d88e679 2987 /* In case the HCD restarted the timer, stop it again. */
541c7d43 2988 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
1b42ae6d
AS		 2989 del_timer_sync(&hcd->rh_timer);
2990
c5635437 2991 if (usb_hcd_is_primary_hcd(hcd)) {
cd70469d 2992 if (hcd->irq > 0)
c5635437
SS		 2993 free_irq(hcd->irq, hcd);
2994 }
6d88e679 2995
1da177e4
LT		 2996 usb_deregister_bus(&hcd->self);
2997 hcd_buffer_destroy(hcd);
00433254 2998
ef44cb42 2999 if (IS_ENABLED(CONFIG_GENERIC_PHY) && hcd->remove_phy && hcd->phy) {
00433254
SS		 3000 phy_power_off(hcd->phy);
3001 phy_exit(hcd->phy);
3002 phy_put(hcd->phy);
3003 hcd->phy = NULL;
3004 }
3d46e73d
AT		 3005 if (hcd->remove_phy && hcd->usb_phy) {
3006 usb_phy_shutdown(hcd->usb_phy);
3007 usb_put_phy(hcd->usb_phy);
3008 hcd->usb_phy = NULL;
103e127d 3009 }
d8521afe
DW		 3010
3011 usb_put_invalidate_rhdev(hcd);
1da177e4 3012}
782e70c6 3013EXPORT_SYMBOL_GPL(usb_remove_hcd);
1da177e4 3014
64a21d02 3015void
842c1960 3016usb_hcd_platform_shutdown(struct platform_device *dev)
64a21d02
AG		 3017{
3018 struct usb_hcd *hcd = platform_get_drvdata(dev);
3019
3020 if (hcd->driver->shutdown)
3021 hcd->driver->shutdown(hcd);
3022}
782e70c6 3023EXPORT_SYMBOL_GPL(usb_hcd_platform_shutdown);
64a21d02 3024
1da177e4
LT		 3025/*-------------------------------------------------------------------------*/
3026
f150fa1a 3027#if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
1da177e4 3028
6fb8ac81 3029const struct usb_mon_operations *mon_ops;
1da177e4
LT		 3030
3031/*
3032 * The registration is unlocked.
3033 * We do it this way because we do not want to lock in hot paths.
3034 *
3035 * Notice that the code is minimally error-proof. Because usbmon needs
3036 * symbols from usbcore, usbcore gets referenced and cannot be unloaded first.
3037 */
14557359 3038
6fb8ac81 3039int usb_mon_register(const struct usb_mon_operations *ops)
1da177e4
LT		 3040{
3041
3042 if (mon_ops)
3043 return -EBUSY;
3044
3045 mon_ops = ops;
3046 mb();
3047 return 0;
3048}
3049EXPORT_SYMBOL_GPL (usb_mon_register);
3050
3051void usb_mon_deregister (void)
3052{
3053
3054 if (mon_ops == NULL) {
3055 printk(KERN_ERR "USB: monitor was not registered\n");
3056 return;
3057 }
3058 mon_ops = NULL;
3059 mb();
3060}
3061EXPORT_SYMBOL_GPL (usb_mon_deregister);
3062
f150fa1a 3063#endif /* CONFIG_USB_MON || CONFIG_USB_MON_MODULE */
Linux 6.x block layer and io_uring tree(s)