drivers/usb/wusbcore/wusbhc.h

   1 /*
   2  * Wireless USB Host Controller
   3  * Common infrastructure for WHCI and HWA WUSB-HC drivers
   4  *
   5  *
   6  * Copyright (C) 2005-2006 Intel Corporation
   7  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License version
  11  * 2 as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21  * 02110-1301, USA.
  22  *
  23  *
  24  * This driver implements parts common to all Wireless USB Host
  25  * Controllers (struct wusbhc, embedding a struct usb_hcd) and is used
  26  * by:
  27  *
  28  *   - hwahc: HWA, USB-dongle that implements a Wireless USB host
  29  *     controller, (Wireless USB 1.0 Host-Wire-Adapter specification).
  30  *
  31  *   - whci: WHCI, a PCI card with a wireless host controller
  32  *     (Wireless Host Controller Interface 1.0 specification).
  33  *
  34  * Check out the Design-overview.txt file in the source documentation
  35  * for other details on the implementation.
  36  *
  37  * Main blocks:
  38  *
  39  *  rh         Root Hub emulation (part of the HCD glue)
  40  *
  41  *  devconnect Handle all the issues related to device connection,
  42  *             authentication, disconnection, timeout, reseting,
  43  *             keepalives, etc.
  44  *
  45  *  mmc        MMC IE broadcasting handling
  46  *
  47  * A host controller driver just initializes its stuff and as part of
  48  * that, creates a 'struct wusbhc' instance that handles all the
  49  * common WUSB mechanisms. Links in the function ops that are specific
  50  * to it and then registers the host controller. Ready to run.
  51  */
  52
  53 #ifndef __WUSBHC_H__
  54 #define __WUSBHC_H__
  55
  56 #include <linux/usb.h>
  57 #include <linux/list.h>
  58 #include <linux/mutex.h>
  59 #include <linux/kref.h>
  60 #include <linux/workqueue.h>
  61 #include <linux/usb/hcd.h>
  62 #include <linux/uwb.h>
  63 #include <linux/usb/wusb.h>
  64
  65 /*
  66  * Time from a WUSB channel stop request to the last transmitted MMC.
  67  *
  68  * This needs to be > 4.096 ms in case no MMCs can be transmitted in
  69  * zone 0.
  70  */
  71 #define WUSB_CHANNEL_STOP_DELAY_MS 8
  72 #define WUSB_RETRY_COUNT_MAX 15
  73 #define WUSB_RETRY_COUNT_INFINITE 0
  74
  75 /**
  76  * Wireless USB device
  77  *
  78  * Describe a WUSB device connected to the cluster. This struct
  79  * belongs to the 'struct wusb_port' it is attached to and it is
  80  * responsible for putting and clearing the pointer to it.
  81  *
  82  * Note this "complements" the 'struct usb_device' that the usb_hcd
  83  * keeps for each connected USB device. However, it extends some
  84  * information that is not available (there is no hcpriv ptr in it!)
  85  * *and* most importantly, it's life cycle is different. It is created
  86  * as soon as we get a DN_Connect (connect request notification) from
  87  * the device through the WUSB host controller; the USB stack doesn't
  88  * create the device until we authenticate it. FIXME: this will
  89  * change.
  90  *
  91  * @bos:    This is allocated when the BOS descriptors are read from
  92  *          the device and freed upon the wusb_dev struct dying.
  93  * @wusb_cap_descr: points into @bos, and has been verified to be size
  94  *                  safe.
  95  */
  96 struct wusb_dev {
  97         struct kref refcnt;
  98         struct wusbhc *wusbhc;
  99         struct list_head cack_node;     /* Connect-Ack list */
 100         struct list_head rekey_node;    /* GTK rekey list */
 101         u8 port_idx;
 102         u8 addr;
 103         u8 beacon_type:4;
 104         struct usb_encryption_descriptor ccm1_etd;
 105         struct wusb_ckhdid cdid;
 106         unsigned long entry_ts;
 107         struct usb_bos_descriptor *bos;
 108         struct usb_wireless_cap_descriptor *wusb_cap_descr;
 109         struct uwb_mas_bm availability;
 110         struct work_struct devconnect_acked_work;
 111         struct usb_device *usb_dev;
 112 };
 113
 114 #define WUSB_DEV_ADDR_UNAUTH 0x80
 115
 116 static inline void wusb_dev_init(struct wusb_dev *wusb_dev)
 117 {
 118         kref_init(&wusb_dev->refcnt);
 119         /* no need to init the cack_node */
 120 }
 121
 122 extern void wusb_dev_destroy(struct kref *_wusb_dev);
 123
 124 static inline struct wusb_dev *wusb_dev_get(struct wusb_dev *wusb_dev)
 125 {
 126         kref_get(&wusb_dev->refcnt);
 127         return wusb_dev;
 128 }
 129
 130 static inline void wusb_dev_put(struct wusb_dev *wusb_dev)
 131 {
 132         kref_put(&wusb_dev->refcnt, wusb_dev_destroy);
 133 }
 134
 135 /**
 136  * Wireless USB Host Controller root hub "fake" ports
 137  * (state and device information)
 138  *
 139  * Wireless USB is wireless, so there are no ports; but we
 140  * fake'em. Each RC can connect a max of devices at the same time
 141  * (given in the Wireless Adapter descriptor, bNumPorts or WHCI's
 142  * caps), referred to in wusbhc->ports_max.
 143  *
 144  * See rh.c for more information.
 145  *
 146  * The @status and @change use the same bits as in USB2.0[11.24.2.7],
 147  * so we don't have to do much when getting the port's status.
 148  *
 149  * WUSB1.0[7.1], USB2.0[11.24.2.7.1,fig 11-10],
 150  * include/linux/usb_ch9.h (#define USB_PORT_STAT_*)
 151  */
 152 struct wusb_port {
 153         u16 status;
 154         u16 change;
 155         struct wusb_dev *wusb_dev;      /* connected device's info */
 156         u32 ptk_tkid;
 157 };
 158
 159 /**
 160  * WUSB Host Controller specifics
 161  *
 162  * All fields that are common to all Wireless USB controller types
 163  * (HWA and WHCI) are grouped here. Host Controller
 164  * functions/operations that only deal with general Wireless USB HC
 165  * issues use this data type to refer to the host.
 166  *
 167  * @usb_hcd        Instantiation of a USB host controller
 168  *                 (initialized by upper layer [HWA=HC or WHCI].
 169  *
 170  * @dev            Device that implements this; initialized by the
 171  *                 upper layer (HWA-HC, WHCI...); this device should
 172  *                 have a refcount.
 173  *
 174  * @trust_timeout  After this time without hearing for device
 175  *                 activity, we consider the device gone and we have to
 176  *                 re-authenticate.
 177  *
 178  *                 Can be accessed w/o locking--however, read to a
 179  *                 local variable then use.
 180  *
 181  * @chid           WUSB Cluster Host ID: this is supposed to be a
 182  *                 unique value that doesn't change across reboots (so
 183  *                 that your devices do not require re-association).
 184  *
 185  *                 Read/Write protected by @mutex
 186  *
 187  * @dev_info       This array has ports_max elements. It is used to
 188  *                 give the HC information about the WUSB devices (see
 189  *                 'struct wusb_dev_info').
 190  *
 191  *                 For HWA we need to allocate it in heap; for WHCI it
 192  *                 needs to be permanently mapped, so we keep it for
 193  *                 both and make it easy. Call wusbhc->dev_info_set()
 194  *                 to update an entry.
 195  *
 196  * @ports_max      Number of simultaneous device connections (fake
 197  *                 ports) this HC will take. Read-only.
 198  *
 199  * @port           Array of port status for each fake root port. Guaranteed to
 200  *                 always be the same length during device existence
 201  *                 [this allows for some unlocked but referenced reading].
 202  *
 203  * @mmcies_max     Max number of Information Elements this HC can send
 204  *                 in its MMC. Read-only.
 205  *
 206  * @start          Start the WUSB channel.
 207  *
 208  * @stop           Stop the WUSB channel after the specified number of
 209  *                 milliseconds.  Channel Stop IEs should be transmitted
 210  *                 as required by [WUSB] 4.16.2.1.
 211  *
 212  * @mmcie_add      HC specific operation (WHCI or HWA) for adding an
 213  *                 MMCIE.
 214  *
 215  * @mmcie_rm       HC specific operation (WHCI or HWA) for removing an
 216  *                 MMCIE.
 217  *
 218  * @set_ptk:       Set the PTK and enable encryption for a device. Or, if
 219  *                 the supplied key is NULL, disable encryption for that
 220  *                 device.
 221  *
 222  * @set_gtk:       Set the GTK to be used for all future broadcast packets
 223  *                 (i.e., MMCs).  With some hardware, setting the GTK may start
 224  *                 MMC transmission.
 225  *
 226  * NOTE:
 227  *
 228  *  - If wusb_dev->usb_dev is not NULL, then usb_dev is valid
 229  *    (wusb_dev has a refcount on it). Likewise, if usb_dev->wusb_dev
 230  *    is not NULL, usb_dev->wusb_dev is valid (usb_dev keeps a
 231  *    refcount on it).
 232  *
 233  *    Most of the times when you need to use it, it will be non-NULL,
 234  *    so there is no real need to check for it (wusb_dev will
 235  *    disappear before usb_dev).
 236  *
 237  *  - The following fields need to be filled out before calling
 238  *    wusbhc_create(): ports_max, mmcies_max, mmcie_{add,rm}.
 239  *
 240  *  - there is no wusbhc_init() method, we do everything in
 241  *    wusbhc_create().
 242  *
 243  *  - Creation is done in two phases, wusbhc_create() and
 244  *    wusbhc_create_b(); b are the parts that need to be called after
 245  *    calling usb_hcd_add(&wusbhc->usb_hcd).
 246  */
 247 struct wusbhc {
 248         struct usb_hcd usb_hcd;         /* HAS TO BE 1st */
 249         struct device *dev;
 250         struct uwb_rc *uwb_rc;
 251         struct uwb_pal pal;
 252
 253         unsigned trust_timeout;                 /* in jiffies */
 254         struct wusb_ckhdid chid;
 255         uint8_t phy_rate;
 256         uint8_t dnts_num_slots;
 257         uint8_t dnts_interval;
 258         uint8_t retry_count;
 259         struct wuie_host_info *wuie_host_info;
 260
 261         struct mutex mutex;                     /* locks everything else */
 262         u16 cluster_id;                         /* Wireless USB Cluster ID */
 263         struct wusb_port *port;                 /* Fake port status handling */
 264         struct wusb_dev_info *dev_info;         /* for Set Device Info mgmt */
 265         u8 ports_max;
 266         unsigned active:1;                      /* currently xmit'ing MMCs */
 267         struct wuie_keep_alive keep_alive_ie;   /* protected by mutex */
 268         struct delayed_work keep_alive_timer;
 269         struct list_head cack_list;             /* Connect acknowledging */
 270         size_t cack_count;                      /* protected by 'mutex' */
 271         struct wuie_connect_ack cack_ie;
 272         struct uwb_rsv *rsv;            /* cluster bandwidth reservation */
 273
 274         struct mutex mmcie_mutex;               /* MMC WUIE handling */
 275         struct wuie_hdr **mmcie;                /* WUIE array */
 276         u8 mmcies_max;
 277         /* FIXME: make wusbhc_ops? */
 278         int (*start)(struct wusbhc *wusbhc);
 279         void (*stop)(struct wusbhc *wusbhc, int delay);
 280         int (*mmcie_add)(struct wusbhc *wusbhc, u8 interval, u8 repeat_cnt,
 281                          u8 handle, struct wuie_hdr *wuie);
 282         int (*mmcie_rm)(struct wusbhc *wusbhc, u8 handle);
 283         int (*dev_info_set)(struct wusbhc *, struct wusb_dev *wusb_dev);
 284         int (*bwa_set)(struct wusbhc *wusbhc, s8 stream_index,
 285                        const struct uwb_mas_bm *);
 286         int (*set_ptk)(struct wusbhc *wusbhc, u8 port_idx,
 287                        u32 tkid, const void *key, size_t key_size);
 288         int (*set_gtk)(struct wusbhc *wusbhc,
 289                        u32 tkid, const void *key, size_t key_size);
 290         int (*set_num_dnts)(struct wusbhc *wusbhc, u8 interval, u8 slots);
 291
 292         struct {
 293                 struct usb_key_descriptor descr;
 294                 u8 data[16];                            /* GTK key data */
 295         } __attribute__((packed)) gtk;
 296         u8 gtk_index;
 297         u32 gtk_tkid;
 298
 299         /* workqueue for WUSB security related tasks. */
 300         struct workqueue_struct *wq_security;
 301         struct work_struct gtk_rekey_work;
 302
 303         struct usb_encryption_descriptor *ccm1_etd;
 304 };
 305
 306 #define usb_hcd_to_wusbhc(u) container_of((u), struct wusbhc, usb_hcd)
 307
 308
 309 extern int wusbhc_create(struct wusbhc *);
 310 extern int wusbhc_b_create(struct wusbhc *);
 311 extern void wusbhc_b_destroy(struct wusbhc *);
 312 extern void wusbhc_destroy(struct wusbhc *);
 313 extern int wusb_dev_sysfs_add(struct wusbhc *, struct usb_device *,
 314                               struct wusb_dev *);
 315 extern void wusb_dev_sysfs_rm(struct wusb_dev *);
 316 extern int wusbhc_sec_create(struct wusbhc *);
 317 extern int wusbhc_sec_start(struct wusbhc *);
 318 extern void wusbhc_sec_stop(struct wusbhc *);
 319 extern void wusbhc_sec_destroy(struct wusbhc *);
 320 extern void wusbhc_giveback_urb(struct wusbhc *wusbhc, struct urb *urb,
 321                                 int status);
 322 void wusbhc_reset_all(struct wusbhc *wusbhc);
 323
 324 int wusbhc_pal_register(struct wusbhc *wusbhc);
 325 void wusbhc_pal_unregister(struct wusbhc *wusbhc);
 326
 327 /*
 328  * Return @usb_dev's @usb_hcd (properly referenced) or NULL if gone
 329  *
 330  * @usb_dev: USB device, UNLOCKED and referenced (or otherwise, safe ptr)
 331  *
 332  * This is a safe assumption as @usb_dev->bus is referenced all the
 333  * time during the @usb_dev life cycle.
 334  */
 335 static inline
 336 struct usb_hcd *usb_hcd_get_by_usb_dev(struct usb_device *usb_dev)
 337 {
 338         struct usb_hcd *usb_hcd;
 339         usb_hcd = bus_to_hcd(usb_dev->bus);
 340         return usb_get_hcd(usb_hcd);
 341 }
 342
 343 /*
 344  * Increment the reference count on a wusbhc.
 345  *
 346  * @wusbhc's life cycle is identical to that of the underlying usb_hcd.
 347  */
 348 static inline struct wusbhc *wusbhc_get(struct wusbhc *wusbhc)
 349 {
 350         return usb_get_hcd(&wusbhc->usb_hcd) ? wusbhc : NULL;
 351 }
 352
 353 /*
 354  * Return the wusbhc associated to a @usb_dev
 355  *
 356  * @usb_dev: USB device, UNLOCKED and referenced (or otherwise, safe ptr)
 357  *
 358  * @returns: wusbhc for @usb_dev; NULL if the @usb_dev is being torn down.
 359  *           WARNING: referenced at the usb_hcd level, unlocked
 360  *
 361  * FIXME: move offline
 362  */
 363 static inline struct wusbhc *wusbhc_get_by_usb_dev(struct usb_device *usb_dev)
 364 {
 365         struct wusbhc *wusbhc = NULL;
 366         struct usb_hcd *usb_hcd;
 367         if (usb_dev->devnum > 1 && !usb_dev->wusb) {
 368                 /* but root hubs */
 369                 dev_err(&usb_dev->dev, "devnum %d wusb %d\n", usb_dev->devnum,
 370                         usb_dev->wusb);
 371                 BUG_ON(usb_dev->devnum > 1 && !usb_dev->wusb);
 372         }
 373         usb_hcd = usb_hcd_get_by_usb_dev(usb_dev);
 374         if (usb_hcd == NULL)
 375                 return NULL;
 376         BUG_ON(usb_hcd->wireless == 0);
 377         return wusbhc = usb_hcd_to_wusbhc(usb_hcd);
 378 }
 379
 380
 381 static inline void wusbhc_put(struct wusbhc *wusbhc)
 382 {
 383         usb_put_hcd(&wusbhc->usb_hcd);
 384 }
 385
 386 int wusbhc_start(struct wusbhc *wusbhc);
 387 void wusbhc_stop(struct wusbhc *wusbhc);
 388 extern int wusbhc_chid_set(struct wusbhc *, const struct wusb_ckhdid *);
 389
 390 /* Device connect handling */
 391 extern int wusbhc_devconnect_create(struct wusbhc *);
 392 extern void wusbhc_devconnect_destroy(struct wusbhc *);
 393 extern int wusbhc_devconnect_start(struct wusbhc *wusbhc);
 394 extern void wusbhc_devconnect_stop(struct wusbhc *wusbhc);
 395 extern void wusbhc_handle_dn(struct wusbhc *, u8 srcaddr,
 396                              struct wusb_dn_hdr *dn_hdr, size_t size);
 397 extern void __wusbhc_dev_disable(struct wusbhc *wusbhc, u8 port);
 398 extern int wusb_usb_ncb(struct notifier_block *nb, unsigned long val,
 399                         void *priv);
 400 extern int wusb_set_dev_addr(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev,
 401                              u8 addr);
 402
 403 /* Wireless USB fake Root Hub methods */
 404 extern int wusbhc_rh_create(struct wusbhc *);
 405 extern void wusbhc_rh_destroy(struct wusbhc *);
 406
 407 extern int wusbhc_rh_status_data(struct usb_hcd *, char *);
 408 extern int wusbhc_rh_control(struct usb_hcd *, u16, u16, u16, char *, u16);
 409 extern int wusbhc_rh_start_port_reset(struct usb_hcd *, unsigned);
 410
 411 /* MMC handling */
 412 extern int wusbhc_mmcie_create(struct wusbhc *);
 413 extern void wusbhc_mmcie_destroy(struct wusbhc *);
 414 extern int wusbhc_mmcie_set(struct wusbhc *, u8 interval, u8 repeat_cnt,
 415                             struct wuie_hdr *);
 416 extern void wusbhc_mmcie_rm(struct wusbhc *, struct wuie_hdr *);
 417
 418 /* Bandwidth reservation */
 419 int wusbhc_rsv_establish(struct wusbhc *wusbhc);
 420 void wusbhc_rsv_terminate(struct wusbhc *wusbhc);
 421
 422 /*
 423  * I've always said
 424  * I wanted a wedding in a church...
 425  *
 426  * but lately I've been thinking about
 427  * the Botanical Gardens.
 428  *
 429  * We could do it by the tulips.
 430  * It'll be beautiful
 431  *
 432  * --Security!
 433  */
 434 extern int wusb_dev_sec_add(struct wusbhc *, struct usb_device *,
 435                                 struct wusb_dev *);
 436 extern void wusb_dev_sec_rm(struct wusb_dev *) ;
 437 extern int wusb_dev_4way_handshake(struct wusbhc *, struct wusb_dev *,
 438                                    struct wusb_ckhdid *ck);
 439 void wusbhc_gtk_rekey(struct wusbhc *wusbhc);
 440 int wusb_dev_update_address(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev);
 441
 442
 443 /* WUSB Cluster ID handling */
 444 extern u8 wusb_cluster_id_get(void);
 445 extern void wusb_cluster_id_put(u8);
 446
 447 /*
 448  * wusb_port_by_idx - return the port associated to a zero-based port index
 449  *
 450  * NOTE: valid without locking as long as wusbhc is referenced (as the
 451  *       number of ports doesn't change). The data pointed to has to
 452  *       be verified though :)
 453  */
 454 static inline struct wusb_port *wusb_port_by_idx(struct wusbhc *wusbhc,
 455                                                  u8 port_idx)
 456 {
 457         return &wusbhc->port[port_idx];
 458 }
 459
 460 /*
 461  * wusb_port_no_to_idx - Convert port number (per usb_dev->portnum) to
 462  * a port_idx.
 463  *
 464  * USB stack USB ports are 1 based!!
 465  *
 466  * NOTE: only valid for WUSB devices!!!
 467  */
 468 static inline u8 wusb_port_no_to_idx(u8 port_no)
 469 {
 470         return port_no - 1;
 471 }
 472
 473 extern struct wusb_dev *__wusb_dev_get_by_usb_dev(struct wusbhc *,
 474                                                   struct usb_device *);
 475
 476 /*
 477  * Return a referenced wusb_dev given a @usb_dev
 478  *
 479  * Returns NULL if the usb_dev is being torn down.
 480  *
 481  * FIXME: move offline
 482  */
 483 static inline
 484 struct wusb_dev *wusb_dev_get_by_usb_dev(struct usb_device *usb_dev)
 485 {
 486         struct wusbhc *wusbhc;
 487         struct wusb_dev *wusb_dev;
 488         wusbhc = wusbhc_get_by_usb_dev(usb_dev);
 489         if (wusbhc == NULL)
 490                 return NULL;
 491         mutex_lock(&wusbhc->mutex);
 492         wusb_dev = __wusb_dev_get_by_usb_dev(wusbhc, usb_dev);
 493         mutex_unlock(&wusbhc->mutex);
 494         wusbhc_put(wusbhc);
 495         return wusb_dev;
 496 }
 497
 498 /* Misc */
 499
 500 extern struct workqueue_struct *wusbd;
 501 #endif /* #ifndef __WUSBHC_H__ */