drivers/usb/core/hcd.c

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