drivers/usb/core/hcd.c

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