include/linux/usb/hcd.h

   1 /*
   2  * Copyright (c) 2001-2002 by David Brownell
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or (at your
   7  * option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 #ifndef __USB_CORE_HCD_H
  20 #define __USB_CORE_HCD_H
  21
  22 #ifdef __KERNEL__
  23
  24 #include <linux/rwsem.h>
  25
  26 #define MAX_TOPO_LEVEL          6
  27
  28 /* This file contains declarations of usbcore internals that are mostly
  29  * used or exposed by Host Controller Drivers.
  30  */
  31
  32 /*
  33  * USB Packet IDs (PIDs)
  34  */
  35 #define USB_PID_EXT                     0xf0    /* USB 2.0 LPM ECN */
  36 #define USB_PID_OUT                     0xe1
  37 #define USB_PID_ACK                     0xd2
  38 #define USB_PID_DATA0                   0xc3
  39 #define USB_PID_PING                    0xb4    /* USB 2.0 */
  40 #define USB_PID_SOF                     0xa5
  41 #define USB_PID_NYET                    0x96    /* USB 2.0 */
  42 #define USB_PID_DATA2                   0x87    /* USB 2.0 */
  43 #define USB_PID_SPLIT                   0x78    /* USB 2.0 */
  44 #define USB_PID_IN                      0x69
  45 #define USB_PID_NAK                     0x5a
  46 #define USB_PID_DATA1                   0x4b
  47 #define USB_PID_PREAMBLE                0x3c    /* Token mode */
  48 #define USB_PID_ERR                     0x3c    /* USB 2.0: handshake mode */
  49 #define USB_PID_SETUP                   0x2d
  50 #define USB_PID_STALL                   0x1e
  51 #define USB_PID_MDATA                   0x0f    /* USB 2.0 */
  52
  53 /*-------------------------------------------------------------------------*/
  54
  55 /*
  56  * USB Host Controller Driver (usb_hcd) framework
  57  *
  58  * Since "struct usb_bus" is so thin, you can't share much code in it.
  59  * This framework is a layer over that, and should be more sharable.
  60  *
  61  * @authorized_default: Specifies if new devices are authorized to
  62  *                      connect by default or they require explicit
  63  *                      user space authorization; this bit is settable
  64  *                      through /sys/class/usb_host/X/authorized_default.
  65  *                      For the rest is RO, so we don't lock to r/w it.
  66  */
  67
  68 /*-------------------------------------------------------------------------*/
  69
  70 struct usb_hcd {
  71
  72         /*
  73          * housekeeping
  74          */
  75         struct usb_bus          self;           /* hcd is-a bus */
  76         struct kref             kref;           /* reference counter */
  77
  78         const char              *product_desc;  /* product/vendor string */
  79         int                     speed;          /* Speed for this roothub.
  80                                                  * May be different from
  81                                                  * hcd->driver->flags & HCD_MASK
  82                                                  */
  83         char                    irq_descr[24];  /* driver + bus # */
  84
  85         struct timer_list       rh_timer;       /* drives root-hub polling */
  86         struct urb              *status_urb;    /* the current status urb */
  87 #ifdef CONFIG_USB_SUSPEND
  88         struct work_struct      wakeup_work;    /* for remote wakeup */
  89 #endif
  90
  91         /*
  92          * hardware info/state
  93          */
  94         const struct hc_driver  *driver;        /* hw-specific hooks */
  95
  96         /* Flags that need to be manipulated atomically because they can
  97          * change while the host controller is running.  Always use
  98          * set_bit() or clear_bit() to change their values.
  99          */
 100         unsigned long           flags;
 101 #define HCD_FLAG_HW_ACCESSIBLE          0       /* at full power */
 102 #define HCD_FLAG_SAW_IRQ                1
 103 #define HCD_FLAG_POLL_RH                2       /* poll for rh status? */
 104 #define HCD_FLAG_POLL_PENDING           3       /* status has changed? */
 105 #define HCD_FLAG_WAKEUP_PENDING         4       /* root hub is resuming? */
 106 #define HCD_FLAG_RH_RUNNING             5       /* root hub is running? */
 107 #define HCD_FLAG_DEAD                   6       /* controller has died? */
 108
 109         /* The flags can be tested using these macros; they are likely to
 110          * be slightly faster than test_bit().
 111          */
 112 #define HCD_HW_ACCESSIBLE(hcd)  ((hcd)->flags & (1U << HCD_FLAG_HW_ACCESSIBLE))
 113 #define HCD_SAW_IRQ(hcd)        ((hcd)->flags & (1U << HCD_FLAG_SAW_IRQ))
 114 #define HCD_POLL_RH(hcd)        ((hcd)->flags & (1U << HCD_FLAG_POLL_RH))
 115 #define HCD_POLL_PENDING(hcd)   ((hcd)->flags & (1U << HCD_FLAG_POLL_PENDING))
 116 #define HCD_WAKEUP_PENDING(hcd) ((hcd)->flags & (1U << HCD_FLAG_WAKEUP_PENDING))
 117 #define HCD_RH_RUNNING(hcd)     ((hcd)->flags & (1U << HCD_FLAG_RH_RUNNING))
 118 #define HCD_DEAD(hcd)           ((hcd)->flags & (1U << HCD_FLAG_DEAD))
 119
 120         /* Flags that get set only during HCD registration or removal. */
 121         unsigned                rh_registered:1;/* is root hub registered? */
 122         unsigned                rh_pollable:1;  /* may we poll the root hub? */
 123         unsigned                msix_enabled:1; /* driver has MSI-X enabled? */
 124
 125         /* The next flag is a stopgap, to be removed when all the HCDs
 126          * support the new root-hub polling mechanism. */
 127         unsigned                uses_new_polling:1;
 128         unsigned                wireless:1;     /* Wireless USB HCD */
 129         unsigned                authorized_default:1;
 130         unsigned                has_tt:1;       /* Integrated TT in root hub */
 131
 132         int                     irq;            /* irq allocated */
 133         void __iomem            *regs;          /* device memory/io */
 134         u64                     rsrc_start;     /* memory/io resource start */
 135         u64                     rsrc_len;       /* memory/io resource length */
 136         unsigned                power_budget;   /* in mA, 0 = no limit */
 137
 138         /* bandwidth_mutex should be taken before adding or removing
 139          * any new bus bandwidth constraints:
 140          *   1. Before adding a configuration for a new device.
 141          *   2. Before removing the configuration to put the device into
 142          *      the addressed state.
 143          *   3. Before selecting a different configuration.
 144          *   4. Before selecting an alternate interface setting.
 145          *
 146          * bandwidth_mutex should be dropped after a successful control message
 147          * to the device, or resetting the bandwidth after a failed attempt.
 148          */
 149         struct mutex            *bandwidth_mutex;
 150         struct usb_hcd          *shared_hcd;
 151         struct usb_hcd          *primary_hcd;
 152
 153
 154 #define HCD_BUFFER_POOLS        4
 155         struct dma_pool         *pool[HCD_BUFFER_POOLS];
 156
 157         int                     state;
 158 #       define  __ACTIVE                0x01
 159 #       define  __SUSPEND               0x04
 160 #       define  __TRANSIENT             0x80
 161
 162 #       define  HC_STATE_HALT           0
 163 #       define  HC_STATE_RUNNING        (__ACTIVE)
 164 #       define  HC_STATE_QUIESCING      (__SUSPEND|__TRANSIENT|__ACTIVE)
 165 #       define  HC_STATE_RESUMING       (__SUSPEND|__TRANSIENT)
 166 #       define  HC_STATE_SUSPENDED      (__SUSPEND)
 167
 168 #define HC_IS_RUNNING(state) ((state) & __ACTIVE)
 169 #define HC_IS_SUSPENDED(state) ((state) & __SUSPEND)
 170
 171         /* more shared queuing code would be good; it should support
 172          * smarter scheduling, handle transaction translators, etc;
 173          * input size of periodic table to an interrupt scheduler.
 174          * (ohci 32, uhci 1024, ehci 256/512/1024).
 175          */
 176
 177         /* The HC driver's private data is stored at the end of
 178          * this structure.
 179          */
 180         unsigned long hcd_priv[0]
 181                         __attribute__ ((aligned(sizeof(unsigned long))));
 182 };
 183
 184 /* 2.4 does this a bit differently ... */
 185 static inline struct usb_bus *hcd_to_bus(struct usb_hcd *hcd)
 186 {
 187         return &hcd->self;
 188 }
 189
 190 static inline struct usb_hcd *bus_to_hcd(struct usb_bus *bus)
 191 {
 192         return container_of(bus, struct usb_hcd, self);
 193 }
 194
 195 struct hcd_timeout {    /* timeouts we allocate */
 196         struct list_head        timeout_list;
 197         struct timer_list       timer;
 198 };
 199
 200 /*-------------------------------------------------------------------------*/
 201
 202
 203 struct hc_driver {
 204         const char      *description;   /* "ehci-hcd" etc */
 205         const char      *product_desc;  /* product/vendor string */
 206         size_t          hcd_priv_size;  /* size of private data */
 207
 208         /* irq handler */
 209         irqreturn_t     (*irq) (struct usb_hcd *hcd);
 210
 211         int     flags;
 212 #define HCD_MEMORY      0x0001          /* HC regs use memory (else I/O) */
 213 #define HCD_LOCAL_MEM   0x0002          /* HC needs local memory */
 214 #define HCD_SHARED      0x0004          /* Two (or more) usb_hcds share HW */
 215 #define HCD_USB11       0x0010          /* USB 1.1 */
 216 #define HCD_USB2        0x0020          /* USB 2.0 */
 217 #define HCD_USB3        0x0040          /* USB 3.0 */
 218 #define HCD_MASK        0x0070
 219
 220         /* called to init HCD and root hub */
 221         int     (*reset) (struct usb_hcd *hcd);
 222         int     (*start) (struct usb_hcd *hcd);
 223
 224         /* NOTE:  these suspend/resume calls relate to the HC as
 225          * a whole, not just the root hub; they're for PCI bus glue.
 226          */
 227         /* called after suspending the hub, before entering D3 etc */
 228         int     (*pci_suspend)(struct usb_hcd *hcd, bool do_wakeup);
 229
 230         /* called after entering D0 (etc), before resuming the hub */
 231         int     (*pci_resume)(struct usb_hcd *hcd, bool hibernated);
 232
 233         /* cleanly make HCD stop writing memory and doing I/O */
 234         void    (*stop) (struct usb_hcd *hcd);
 235
 236         /* shutdown HCD */
 237         void    (*shutdown) (struct usb_hcd *hcd);
 238
 239         /* return current frame number */
 240         int     (*get_frame_number) (struct usb_hcd *hcd);
 241
 242         /* manage i/o requests, device state */
 243         int     (*urb_enqueue)(struct usb_hcd *hcd,
 244                                 struct urb *urb, gfp_t mem_flags);
 245         int     (*urb_dequeue)(struct usb_hcd *hcd,
 246                                 struct urb *urb, int status);
 247
 248         /*
 249          * (optional) these hooks allow an HCD to override the default DMA
 250          * mapping and unmapping routines.  In general, they shouldn't be
 251          * necessary unless the host controller has special DMA requirements,
 252          * such as alignment contraints.  If these are not specified, the
 253          * general usb_hcd_(un)?map_urb_for_dma functions will be used instead
 254          * (and it may be a good idea to call these functions in your HCD
 255          * implementation)
 256          */
 257         int     (*map_urb_for_dma)(struct usb_hcd *hcd, struct urb *urb,
 258                                    gfp_t mem_flags);
 259         void    (*unmap_urb_for_dma)(struct usb_hcd *hcd, struct urb *urb);
 260
 261         /* hw synch, freeing endpoint resources that urb_dequeue can't */
 262         void    (*endpoint_disable)(struct usb_hcd *hcd,
 263                         struct usb_host_endpoint *ep);
 264
 265         /* (optional) reset any endpoint state such as sequence number
 266            and current window */
 267         void    (*endpoint_reset)(struct usb_hcd *hcd,
 268                         struct usb_host_endpoint *ep);
 269
 270         /* root hub support */
 271         int     (*hub_status_data) (struct usb_hcd *hcd, char *buf);
 272         int     (*hub_control) (struct usb_hcd *hcd,
 273                                 u16 typeReq, u16 wValue, u16 wIndex,
 274                                 char *buf, u16 wLength);
 275         int     (*bus_suspend)(struct usb_hcd *);
 276         int     (*bus_resume)(struct usb_hcd *);
 277         int     (*start_port_reset)(struct usb_hcd *, unsigned port_num);
 278
 279                 /* force handover of high-speed port to full-speed companion */
 280         void    (*relinquish_port)(struct usb_hcd *, int);
 281                 /* has a port been handed over to a companion? */
 282         int     (*port_handed_over)(struct usb_hcd *, int);
 283
 284                 /* CLEAR_TT_BUFFER completion callback */
 285         void    (*clear_tt_buffer_complete)(struct usb_hcd *,
 286                                 struct usb_host_endpoint *);
 287
 288         /* xHCI specific functions */
 289                 /* Called by usb_alloc_dev to alloc HC device structures */
 290         int     (*alloc_dev)(struct usb_hcd *, struct usb_device *);
 291                 /* Called by usb_disconnect to free HC device structures */
 292         void    (*free_dev)(struct usb_hcd *, struct usb_device *);
 293         /* Change a group of bulk endpoints to support multiple stream IDs */
 294         int     (*alloc_streams)(struct usb_hcd *hcd, struct usb_device *udev,
 295                 struct usb_host_endpoint **eps, unsigned int num_eps,
 296                 unsigned int num_streams, gfp_t mem_flags);
 297         /* Reverts a group of bulk endpoints back to not using stream IDs.
 298          * Can fail if we run out of memory.
 299          */
 300         int     (*free_streams)(struct usb_hcd *hcd, struct usb_device *udev,
 301                 struct usb_host_endpoint **eps, unsigned int num_eps,
 302                 gfp_t mem_flags);
 303
 304         /* Bandwidth computation functions */
 305         /* Note that add_endpoint() can only be called once per endpoint before
 306          * check_bandwidth() or reset_bandwidth() must be called.
 307          * drop_endpoint() can only be called once per endpoint also.
 308          * A call to xhci_drop_endpoint() followed by a call to
 309          * xhci_add_endpoint() will add the endpoint to the schedule with
 310          * possibly new parameters denoted by a different endpoint descriptor
 311          * in usb_host_endpoint.  A call to xhci_add_endpoint() followed by a
 312          * call to xhci_drop_endpoint() is not allowed.
 313          */
 314                 /* Allocate endpoint resources and add them to a new schedule */
 315         int     (*add_endpoint)(struct usb_hcd *, struct usb_device *,
 316                                 struct usb_host_endpoint *);
 317                 /* Drop an endpoint from a new schedule */
 318         int     (*drop_endpoint)(struct usb_hcd *, struct usb_device *,
 319                                  struct usb_host_endpoint *);
 320                 /* Check that a new hardware configuration, set using
 321                  * endpoint_enable and endpoint_disable, does not exceed bus
 322                  * bandwidth.  This must be called before any set configuration
 323                  * or set interface requests are sent to the device.
 324                  */
 325         int     (*check_bandwidth)(struct usb_hcd *, struct usb_device *);
 326                 /* Reset the device schedule to the last known good schedule,
 327                  * which was set from a previous successful call to
 328                  * check_bandwidth().  This reverts any add_endpoint() and
 329                  * drop_endpoint() calls since that last successful call.
 330                  * Used for when a check_bandwidth() call fails due to resource
 331                  * or bandwidth constraints.
 332                  */
 333         void    (*reset_bandwidth)(struct usb_hcd *, struct usb_device *);
 334                 /* Returns the hardware-chosen device address */
 335         int     (*address_device)(struct usb_hcd *, struct usb_device *udev);
 336                 /* Notifies the HCD after a hub descriptor is fetched.
 337                  * Will block.
 338                  */
 339         int     (*update_hub_device)(struct usb_hcd *, struct usb_device *hdev,
 340                         struct usb_tt *tt, gfp_t mem_flags);
 341         int     (*reset_device)(struct usb_hcd *, struct usb_device *);
 342                 /* Notifies the HCD after a device is connected and its
 343                  * address is set
 344                  */
 345         int     (*update_device)(struct usb_hcd *, struct usb_device *);
 346 };
 347
 348 extern int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb);
 349 extern int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
 350                 int status);
 351 extern void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb);
 352
 353 extern int usb_hcd_submit_urb(struct urb *urb, gfp_t mem_flags);
 354 extern int usb_hcd_unlink_urb(struct urb *urb, int status);
 355 extern void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb,
 356                 int status);
 357 extern int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
 358                 gfp_t mem_flags);
 359 extern void usb_hcd_unmap_urb_setup_for_dma(struct usb_hcd *, struct urb *);
 360 extern void usb_hcd_unmap_urb_for_dma(struct usb_hcd *, struct urb *);
 361 extern void usb_hcd_flush_endpoint(struct usb_device *udev,
 362                 struct usb_host_endpoint *ep);
 363 extern void usb_hcd_disable_endpoint(struct usb_device *udev,
 364                 struct usb_host_endpoint *ep);
 365 extern void usb_hcd_reset_endpoint(struct usb_device *udev,
 366                 struct usb_host_endpoint *ep);
 367 extern void usb_hcd_synchronize_unlinks(struct usb_device *udev);
 368 extern int usb_hcd_alloc_bandwidth(struct usb_device *udev,
 369                 struct usb_host_config *new_config,
 370                 struct usb_host_interface *old_alt,
 371                 struct usb_host_interface *new_alt);
 372 extern int usb_hcd_get_frame_number(struct usb_device *udev);
 373
 374 extern struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
 375                 struct device *dev, const char *bus_name);
 376 extern struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
 377                 struct device *dev, const char *bus_name,
 378                 struct usb_hcd *shared_hcd);
 379 extern struct usb_hcd *usb_get_hcd(struct usb_hcd *hcd);
 380 extern void usb_put_hcd(struct usb_hcd *hcd);
 381 extern int usb_hcd_is_primary_hcd(struct usb_hcd *hcd);
 382 extern int usb_add_hcd(struct usb_hcd *hcd,
 383                 unsigned int irqnum, unsigned long irqflags);
 384 extern void usb_remove_hcd(struct usb_hcd *hcd);
 385
 386 struct platform_device;
 387 extern void usb_hcd_platform_shutdown(struct platform_device *dev);
 388
 389 #ifdef CONFIG_PCI
 390 struct pci_dev;
 391 struct pci_device_id;
 392 extern int usb_hcd_pci_probe(struct pci_dev *dev,
 393                                 const struct pci_device_id *id);
 394 extern void usb_hcd_pci_remove(struct pci_dev *dev);
 395 extern void usb_hcd_pci_shutdown(struct pci_dev *dev);
 396
 397 #ifdef CONFIG_PM_SLEEP
 398 extern const struct dev_pm_ops usb_hcd_pci_pm_ops;
 399 #endif
 400 #endif /* CONFIG_PCI */
 401
 402 /* pci-ish (pdev null is ok) buffer alloc/mapping support */
 403 int hcd_buffer_create(struct usb_hcd *hcd);
 404 void hcd_buffer_destroy(struct usb_hcd *hcd);
 405
 406 void *hcd_buffer_alloc(struct usb_bus *bus, size_t size,
 407         gfp_t mem_flags, dma_addr_t *dma);
 408 void hcd_buffer_free(struct usb_bus *bus, size_t size,
 409         void *addr, dma_addr_t dma);
 410
 411 /* generic bus glue, needed for host controllers that don't use PCI */
 412 extern irqreturn_t usb_hcd_irq(int irq, void *__hcd);
 413
 414 extern void usb_hc_died(struct usb_hcd *hcd);
 415 extern void usb_hcd_poll_rh_status(struct usb_hcd *hcd);
 416
 417 /* The D0/D1 toggle bits ... USE WITH CAUTION (they're almost hcd-internal) */
 418 #define usb_gettoggle(dev, ep, out) (((dev)->toggle[out] >> (ep)) & 1)
 419 #define usb_dotoggle(dev, ep, out)  ((dev)->toggle[out] ^= (1 << (ep)))
 420 #define usb_settoggle(dev, ep, out, bit) \
 421                 ((dev)->toggle[out] = ((dev)->toggle[out] & ~(1 << (ep))) | \
 422                  ((bit) << (ep)))
 423
 424 /* -------------------------------------------------------------------------- */
 425
 426 /* Enumeration is only for the hub driver, or HCD virtual root hubs */
 427 extern struct usb_device *usb_alloc_dev(struct usb_device *parent,
 428                                         struct usb_bus *, unsigned port);
 429 extern int usb_new_device(struct usb_device *dev);
 430 extern void usb_disconnect(struct usb_device **);
 431
 432 extern int usb_get_configuration(struct usb_device *dev);
 433 extern void usb_destroy_configuration(struct usb_device *dev);
 434
 435 /*-------------------------------------------------------------------------*/
 436
 437 /*
 438  * HCD Root Hub support
 439  */
 440
 441 #include <linux/usb/ch11.h>
 442
 443 /*
 444  * As of USB 2.0, full/low speed devices are segregated into trees.
 445  * One type grows from USB 1.1 host controllers (OHCI, UHCI etc).
 446  * The other type grows from high speed hubs when they connect to
 447  * full/low speed devices using "Transaction Translators" (TTs).
 448  *
 449  * TTs should only be known to the hub driver, and high speed bus
 450  * drivers (only EHCI for now).  They affect periodic scheduling and
 451  * sometimes control/bulk error recovery.
 452  */
 453
 454 struct usb_device;
 455
 456 struct usb_tt {
 457         struct usb_device       *hub;   /* upstream highspeed hub */
 458         int                     multi;  /* true means one TT per port */
 459         unsigned                think_time;     /* think time in ns */
 460
 461         /* for control/bulk error recovery (CLEAR_TT_BUFFER) */
 462         spinlock_t              lock;
 463         struct list_head        clear_list;     /* of usb_tt_clear */
 464         struct work_struct      clear_work;
 465 };
 466
 467 struct usb_tt_clear {
 468         struct list_head        clear_list;
 469         unsigned                tt;
 470         u16                     devinfo;
 471         struct usb_hcd          *hcd;
 472         struct usb_host_endpoint        *ep;
 473 };
 474
 475 extern int usb_hub_clear_tt_buffer(struct urb *urb);
 476 extern void usb_ep0_reinit(struct usb_device *);
 477
 478 /* (shifted) direction/type/recipient from the USB 2.0 spec, table 9.2 */
 479 #define DeviceRequest \
 480         ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
 481 #define DeviceOutRequest \
 482         ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
 483
 484 #define InterfaceRequest \
 485         ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
 486
 487 #define EndpointRequest \
 488         ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
 489 #define EndpointOutRequest \
 490         ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
 491
 492 /* class requests from the USB 2.0 hub spec, table 11-15 */
 493 /* GetBusState and SetHubDescriptor are optional, omitted */
 494 #define ClearHubFeature         (0x2000 | USB_REQ_CLEAR_FEATURE)
 495 #define ClearPortFeature        (0x2300 | USB_REQ_CLEAR_FEATURE)
 496 #define GetHubDescriptor        (0xa000 | USB_REQ_GET_DESCRIPTOR)
 497 #define GetHubStatus            (0xa000 | USB_REQ_GET_STATUS)
 498 #define GetPortStatus           (0xa300 | USB_REQ_GET_STATUS)
 499 #define SetHubFeature           (0x2000 | USB_REQ_SET_FEATURE)
 500 #define SetPortFeature          (0x2300 | USB_REQ_SET_FEATURE)
 501
 502
 503 /*-------------------------------------------------------------------------*/
 504
 505 /* class requests from USB 3.0 hub spec, table 10-5 */
 506 #define SetHubDepth             (0x3000 | HUB_SET_DEPTH)
 507 #define GetPortErrorCount       (0x8000 | HUB_GET_PORT_ERR_COUNT)
 508
 509 /*
 510  * Generic bandwidth allocation constants/support
 511  */
 512 #define FRAME_TIME_USECS        1000L
 513 #define BitTime(bytecount) (7 * 8 * bytecount / 6) /* with integer truncation */
 514                 /* Trying not to use worst-case bit-stuffing
 515                  * of (7/6 * 8 * bytecount) = 9.33 * bytecount */
 516                 /* bytecount = data payload byte count */
 517
 518 #define NS_TO_US(ns)    ((ns + 500L) / 1000L)
 519                         /* convert & round nanoseconds to microseconds */
 520
 521
 522 /*
 523  * Full/low speed bandwidth allocation constants/support.
 524  */
 525 #define BW_HOST_DELAY   1000L           /* nanoseconds */
 526 #define BW_HUB_LS_SETUP 333L            /* nanoseconds */
 527                         /* 4 full-speed bit times (est.) */
 528
 529 #define FRAME_TIME_BITS                 12000L  /* frame = 1 millisecond */
 530 #define FRAME_TIME_MAX_BITS_ALLOC       (90L * FRAME_TIME_BITS / 100L)
 531 #define FRAME_TIME_MAX_USECS_ALLOC      (90L * FRAME_TIME_USECS / 100L)
 532
 533 /*
 534  * Ceiling [nano/micro]seconds (typical) for that many bytes at high speed
 535  * ISO is a bit less, no ACK ... from USB 2.0 spec, 5.11.3 (and needed
 536  * to preallocate bandwidth)
 537  */
 538 #define USB2_HOST_DELAY 5       /* nsec, guess */
 539 #define HS_NSECS(bytes) (((55 * 8 * 2083) \
 540         + (2083UL * (3 + BitTime(bytes))))/1000 \
 541         + USB2_HOST_DELAY)
 542 #define HS_NSECS_ISO(bytes) (((38 * 8 * 2083) \
 543         + (2083UL * (3 + BitTime(bytes))))/1000 \
 544         + USB2_HOST_DELAY)
 545 #define HS_USECS(bytes)         NS_TO_US(HS_NSECS(bytes))
 546 #define HS_USECS_ISO(bytes)     NS_TO_US(HS_NSECS_ISO(bytes))
 547
 548 extern long usb_calc_bus_time(int speed, int is_input,
 549                         int isoc, int bytecount);
 550
 551 /*-------------------------------------------------------------------------*/
 552
 553 extern void usb_set_device_state(struct usb_device *udev,
 554                 enum usb_device_state new_state);
 555
 556 /*-------------------------------------------------------------------------*/
 557
 558 /* exported only within usbcore */
 559
 560 extern struct list_head usb_bus_list;
 561 extern struct mutex usb_bus_list_lock;
 562 extern wait_queue_head_t usb_kill_urb_queue;
 563
 564 extern int usb_find_interface_driver(struct usb_device *dev,
 565         struct usb_interface *interface);
 566
 567 #define usb_endpoint_out(ep_dir)        (!((ep_dir) & USB_DIR_IN))
 568
 569 #ifdef CONFIG_PM
 570 extern void usb_root_hub_lost_power(struct usb_device *rhdev);
 571 extern int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg);
 572 extern int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg);
 573 #endif /* CONFIG_PM */
 574
 575 #ifdef CONFIG_USB_SUSPEND
 576 extern void usb_hcd_resume_root_hub(struct usb_hcd *hcd);
 577 #else
 578 static inline void usb_hcd_resume_root_hub(struct usb_hcd *hcd)
 579 {
 580         return;
 581 }
 582 #endif /* CONFIG_USB_SUSPEND */
 583
 584
 585 /*
 586  * USB device fs stuff
 587  */
 588
 589 #ifdef CONFIG_USB_DEVICEFS
 590
 591 /*
 592  * these are expected to be called from the USB core/hub thread
 593  * with the kernel lock held
 594  */
 595 extern void usbfs_update_special(void);
 596 extern int usbfs_init(void);
 597 extern void usbfs_cleanup(void);
 598
 599 #else /* CONFIG_USB_DEVICEFS */
 600
 601 static inline void usbfs_update_special(void) {}
 602 static inline int usbfs_init(void) { return 0; }
 603 static inline void usbfs_cleanup(void) { }
 604
 605 #endif /* CONFIG_USB_DEVICEFS */
 606
 607 /*-------------------------------------------------------------------------*/
 608
 609 #if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
 610
 611 struct usb_mon_operations {
 612         void (*urb_submit)(struct usb_bus *bus, struct urb *urb);
 613         void (*urb_submit_error)(struct usb_bus *bus, struct urb *urb, int err);
 614         void (*urb_complete)(struct usb_bus *bus, struct urb *urb, int status);
 615         /* void (*urb_unlink)(struct usb_bus *bus, struct urb *urb); */
 616 };
 617
 618 extern struct usb_mon_operations *mon_ops;
 619
 620 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb)
 621 {
 622         if (bus->monitored)
 623                 (*mon_ops->urb_submit)(bus, urb);
 624 }
 625
 626 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
 627     int error)
 628 {
 629         if (bus->monitored)
 630                 (*mon_ops->urb_submit_error)(bus, urb, error);
 631 }
 632
 633 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
 634                 int status)
 635 {
 636         if (bus->monitored)
 637                 (*mon_ops->urb_complete)(bus, urb, status);
 638 }
 639
 640 int usb_mon_register(struct usb_mon_operations *ops);
 641 void usb_mon_deregister(void);
 642
 643 #else
 644
 645 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb) {}
 646 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
 647     int error) {}
 648 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
 649                 int status) {}
 650
 651 #endif /* CONFIG_USB_MON || CONFIG_USB_MON_MODULE */
 652
 653 /*-------------------------------------------------------------------------*/
 654
 655 /* random stuff */
 656
 657 #define RUN_CONTEXT (in_irq() ? "in_irq" \
 658                 : (in_interrupt() ? "in_interrupt" : "can sleep"))
 659
 660
 661 /* This rwsem is for use only by the hub driver and ehci-hcd.
 662  * Nobody else should touch it.
 663  */
 664 extern struct rw_semaphore ehci_cf_port_reset_rwsem;
 665
 666 /* Keep track of which host controller drivers are loaded */
 667 #define USB_UHCI_LOADED         0
 668 #define USB_OHCI_LOADED         1
 669 #define USB_EHCI_LOADED         2
 670 extern unsigned long usb_hcds_loaded;
 671
 672 #endif /* __KERNEL__ */
 673
 674 #endif /* __USB_CORE_HCD_H */