release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/uwb/lc-dev.c

   1
   2 #include <linux/kernel.h>
   3 #include <linux/slab.h>
   4 #include <linux/device.h>
   5 #include <linux/err.h>
   6 #include <linux/kdev_t.h>
   7 #include <linux/random.h>
   8 #include "uwb-internal.h"
   9
  10 /* We initialize addresses to 0xff (invalid, as it is bcast) */
  11 static inline void uwb_dev_addr_init(struct uwb_dev_addr *addr)
  12 {
  13         memset(&addr->data, 0xff, sizeof(addr->data));
  14 }
  15
  16 static inline void uwb_mac_addr_init(struct uwb_mac_addr *addr)
  17 {
  18         memset(&addr->data, 0xff, sizeof(addr->data));
  19 }
  20
  21 /* @returns !0 if a device @addr is a broadcast address */
  22 static inline int uwb_dev_addr_bcast(const struct uwb_dev_addr *addr)
  23 {
  24         static const struct uwb_dev_addr bcast = { .data = { 0xff, 0xff } };
  25         return !uwb_dev_addr_cmp(addr, &bcast);
  26 }
  27
  28 /*
  29  * Add callback @new to be called when an event occurs in @rc.
  30  */
  31 int uwb_notifs_register(struct uwb_rc *rc, struct uwb_notifs_handler *new)
  32 {
  33         if (mutex_lock_interruptible(&rc->notifs_chain.mutex))
  34                 return -ERESTARTSYS;
  35         list_add(&new->list_node, &rc->notifs_chain.list);
  36         mutex_unlock(&rc->notifs_chain.mutex);
  37         return 0;
  38 }
  39 EXPORT_SYMBOL_GPL(uwb_notifs_register);
  40
  41 /*
  42  * Remove event handler (callback)
  43  */
  44 int uwb_notifs_deregister(struct uwb_rc *rc, struct uwb_notifs_handler *entry)
  45 {
  46         if (mutex_lock_interruptible(&rc->notifs_chain.mutex))
  47                 return -ERESTARTSYS;
  48         list_del(&entry->list_node);
  49         mutex_unlock(&rc->notifs_chain.mutex);
  50         return 0;
  51 }
  52 EXPORT_SYMBOL_GPL(uwb_notifs_deregister);
  53
  54 /*
  55  * Notify all event handlers of a given event on @rc
  56  *
  57  * We are called with a valid reference to the device, or NULL if the
  58  * event is not for a particular event (e.g., a BG join event).
  59  */
  60 void uwb_notify(struct uwb_rc *rc, struct uwb_dev *uwb_dev, enum uwb_notifs event)
  61 {
  62         struct uwb_notifs_handler *handler;
  63         if (mutex_lock_interruptible(&rc->notifs_chain.mutex))
  64                 return;
  65         if (!list_empty(&rc->notifs_chain.list)) {
  66                 list_for_each_entry(handler, &rc->notifs_chain.list, list_node) {
  67                         handler->cb(handler->data, uwb_dev, event);
  68                 }
  69         }
  70         mutex_unlock(&rc->notifs_chain.mutex);
  71 }
  72
  73 /*
  74  * Release the backing device of a uwb_dev that has been dynamically allocated.
  75  */
  76 static void uwb_dev_sys_release(struct device *dev)
  77 {
  78         struct uwb_dev *uwb_dev = to_uwb_dev(dev);
  79
  80         uwb_bce_put(uwb_dev->bce);
  81         memset(uwb_dev, 0x69, sizeof(*uwb_dev));
  82         kfree(uwb_dev);
  83 }
  84
  85 /*
  86  * Initialize a UWB device instance
  87  *
  88  * Alloc, zero and call this function.
  89  */
  90 void uwb_dev_init(struct uwb_dev *uwb_dev)
  91 {
  92         mutex_init(&uwb_dev->mutex);
  93         device_initialize(&uwb_dev->dev);
  94         uwb_dev->dev.release = uwb_dev_sys_release;
  95         uwb_dev_addr_init(&uwb_dev->dev_addr);
  96         uwb_mac_addr_init(&uwb_dev->mac_addr);
  97         bitmap_fill(uwb_dev->streams, UWB_NUM_GLOBAL_STREAMS);
  98 }
  99
 100 static ssize_t uwb_dev_EUI_48_show(struct device *dev,
 101                                    struct device_attribute *attr, char *buf)
 102 {
 103         struct uwb_dev *uwb_dev = to_uwb_dev(dev);
 104         char addr[UWB_ADDR_STRSIZE];
 105
 106         uwb_mac_addr_print(addr, sizeof(addr), &uwb_dev->mac_addr);
 107         return sprintf(buf, "%s\n", addr);
 108 }
 109 static DEVICE_ATTR(EUI_48, S_IRUGO, uwb_dev_EUI_48_show, NULL);
 110
 111 static ssize_t uwb_dev_DevAddr_show(struct device *dev,
 112                                     struct device_attribute *attr, char *buf)
 113 {
 114         struct uwb_dev *uwb_dev = to_uwb_dev(dev);
 115         char addr[UWB_ADDR_STRSIZE];
 116
 117         uwb_dev_addr_print(addr, sizeof(addr), &uwb_dev->dev_addr);
 118         return sprintf(buf, "%s\n", addr);
 119 }
 120 static DEVICE_ATTR(DevAddr, S_IRUGO, uwb_dev_DevAddr_show, NULL);
 121
 122 /*
 123  * Show the BPST of this device.
 124  *
 125  * Calculated from the receive time of the device's beacon and it's
 126  * slot number.
 127  */
 128 static ssize_t uwb_dev_BPST_show(struct device *dev,
 129                                  struct device_attribute *attr, char *buf)
 130 {
 131         struct uwb_dev *uwb_dev = to_uwb_dev(dev);
 132         struct uwb_beca_e *bce;
 133         struct uwb_beacon_frame *bf;
 134         u16 bpst;
 135
 136         bce = uwb_dev->bce;
 137         mutex_lock(&bce->mutex);
 138         bf = (struct uwb_beacon_frame *)bce->be->BeaconInfo;
 139         bpst = bce->be->wBPSTOffset
 140                 - (u16)(bf->Beacon_Slot_Number * UWB_BEACON_SLOT_LENGTH_US);
 141         mutex_unlock(&bce->mutex);
 142
 143         return sprintf(buf, "%d\n", bpst);
 144 }
 145 static DEVICE_ATTR(BPST, S_IRUGO, uwb_dev_BPST_show, NULL);
 146
 147 /*
 148  * Show the IEs a device is beaconing
 149  *
 150  * We need to access the beacon cache, so we just lock it really
 151  * quick, print the IEs and unlock.
 152  *
 153  * We have a reference on the cache entry, so that should be
 154  * quite safe.
 155  */
 156 static ssize_t uwb_dev_IEs_show(struct device *dev,
 157                                 struct device_attribute *attr, char *buf)
 158 {
 159         struct uwb_dev *uwb_dev = to_uwb_dev(dev);
 160
 161         return uwb_bce_print_IEs(uwb_dev, uwb_dev->bce, buf, PAGE_SIZE);
 162 }
 163 static DEVICE_ATTR(IEs, S_IRUGO | S_IWUSR, uwb_dev_IEs_show, NULL);
 164
 165 static ssize_t uwb_dev_LQE_show(struct device *dev,
 166                                 struct device_attribute *attr, char *buf)
 167 {
 168         struct uwb_dev *uwb_dev = to_uwb_dev(dev);
 169         struct uwb_beca_e *bce = uwb_dev->bce;
 170         size_t result;
 171
 172         mutex_lock(&bce->mutex);
 173         result = stats_show(&uwb_dev->bce->lqe_stats, buf);
 174         mutex_unlock(&bce->mutex);
 175         return result;
 176 }
 177
 178 static ssize_t uwb_dev_LQE_store(struct device *dev,
 179                                  struct device_attribute *attr,
 180                                  const char *buf, size_t size)
 181 {
 182         struct uwb_dev *uwb_dev = to_uwb_dev(dev);
 183         struct uwb_beca_e *bce = uwb_dev->bce;
 184         ssize_t result;
 185
 186         mutex_lock(&bce->mutex);
 187         result = stats_store(&uwb_dev->bce->lqe_stats, buf, size);
 188         mutex_unlock(&bce->mutex);
 189         return result;
 190 }
 191 static DEVICE_ATTR(LQE, S_IRUGO | S_IWUSR, uwb_dev_LQE_show, uwb_dev_LQE_store);
 192
 193 static ssize_t uwb_dev_RSSI_show(struct device *dev,
 194                                  struct device_attribute *attr, char *buf)
 195 {
 196         struct uwb_dev *uwb_dev = to_uwb_dev(dev);
 197         struct uwb_beca_e *bce = uwb_dev->bce;
 198         size_t result;
 199
 200         mutex_lock(&bce->mutex);
 201         result = stats_show(&uwb_dev->bce->rssi_stats, buf);
 202         mutex_unlock(&bce->mutex);
 203         return result;
 204 }
 205
 206 static ssize_t uwb_dev_RSSI_store(struct device *dev,
 207                                   struct device_attribute *attr,
 208                                   const char *buf, size_t size)
 209 {
 210         struct uwb_dev *uwb_dev = to_uwb_dev(dev);
 211         struct uwb_beca_e *bce = uwb_dev->bce;
 212         ssize_t result;
 213
 214         mutex_lock(&bce->mutex);
 215         result = stats_store(&uwb_dev->bce->rssi_stats, buf, size);
 216         mutex_unlock(&bce->mutex);
 217         return result;
 218 }
 219 static DEVICE_ATTR(RSSI, S_IRUGO | S_IWUSR, uwb_dev_RSSI_show, uwb_dev_RSSI_store);
 220
 221
 222 static struct attribute *dev_attrs[] = {
 223         &dev_attr_EUI_48.attr,
 224         &dev_attr_DevAddr.attr,
 225         &dev_attr_BPST.attr,
 226         &dev_attr_IEs.attr,
 227         &dev_attr_LQE.attr,
 228         &dev_attr_RSSI.attr,
 229         NULL,
 230 };
 231
 232 static struct attribute_group dev_attr_group = {
 233         .attrs = dev_attrs,
 234 };
 235
 236 static const struct attribute_group *groups[] = {
 237         &dev_attr_group,
 238         NULL,
 239 };
 240
 241 /**
 242  * Device SYSFS registration
 243  *
 244  *
 245  */
 246 static int __uwb_dev_sys_add(struct uwb_dev *uwb_dev, struct device *parent_dev)
 247 {
 248         struct device *dev;
 249
 250         dev = &uwb_dev->dev;
 251         /* Device sysfs files are only useful for neighbor devices not
 252            local radio controllers. */
 253         if (&uwb_dev->rc->uwb_dev != uwb_dev)
 254                 dev->groups = groups;
 255         dev->parent = parent_dev;
 256         dev_set_drvdata(dev, uwb_dev);
 257
 258         return device_add(dev);
 259 }
 260
 261
 262 static void __uwb_dev_sys_rm(struct uwb_dev *uwb_dev)
 263 {
 264         dev_set_drvdata(&uwb_dev->dev, NULL);
 265         device_del(&uwb_dev->dev);
 266 }
 267
 268
 269 /**
 270  * Register and initialize a new UWB device
 271  *
 272  * Did you call uwb_dev_init() on it?
 273  *
 274  * @parent_rc: is the parent radio controller who has the link to the
 275  *             device. When registering the UWB device that is a UWB
 276  *             Radio Controller, we point back to it.
 277  *
 278  * If registering the device that is part of a radio, caller has set
 279  * rc->uwb_dev->dev. Otherwise it is to be left NULL--a new one will
 280  * be allocated.
 281  */
 282 int uwb_dev_add(struct uwb_dev *uwb_dev, struct device *parent_dev,
 283                 struct uwb_rc *parent_rc)
 284 {
 285         int result;
 286         struct device *dev;
 287
 288         BUG_ON(uwb_dev == NULL);
 289         BUG_ON(parent_dev == NULL);
 290         BUG_ON(parent_rc == NULL);
 291
 292         mutex_lock(&uwb_dev->mutex);
 293         dev = &uwb_dev->dev;
 294         uwb_dev->rc = parent_rc;
 295         result = __uwb_dev_sys_add(uwb_dev, parent_dev);
 296         if (result < 0)
 297                 printk(KERN_ERR "UWB: unable to register dev %s with sysfs: %d\n",
 298                        dev_name(dev), result);
 299         mutex_unlock(&uwb_dev->mutex);
 300         return result;
 301 }
 302
 303
 304 void uwb_dev_rm(struct uwb_dev *uwb_dev)
 305 {
 306         mutex_lock(&uwb_dev->mutex);
 307         __uwb_dev_sys_rm(uwb_dev);
 308         mutex_unlock(&uwb_dev->mutex);
 309 }
 310
 311
 312 static
 313 int __uwb_dev_try_get(struct device *dev, void *__target_uwb_dev)
 314 {
 315         struct uwb_dev *target_uwb_dev = __target_uwb_dev;
 316         struct uwb_dev *uwb_dev = to_uwb_dev(dev);
 317         if (uwb_dev == target_uwb_dev) {
 318                 uwb_dev_get(uwb_dev);
 319                 return 1;
 320         } else
 321                 return 0;
 322 }
 323
 324
 325 /**
 326  * Given a UWB device descriptor, validate and refcount it
 327  *
 328  * @returns NULL if the device does not exist or is quiescing; the ptr to
 329  *               it otherwise.
 330  */
 331 struct uwb_dev *uwb_dev_try_get(struct uwb_rc *rc, struct uwb_dev *uwb_dev)
 332 {
 333         if (uwb_dev_for_each(rc, __uwb_dev_try_get, uwb_dev))
 334                 return uwb_dev;
 335         else
 336                 return NULL;
 337 }
 338 EXPORT_SYMBOL_GPL(uwb_dev_try_get);
 339
 340
 341 /**
 342  * Remove a device from the system [grunt for other functions]
 343  */
 344 int __uwb_dev_offair(struct uwb_dev *uwb_dev, struct uwb_rc *rc)
 345 {
 346         struct device *dev = &uwb_dev->dev;
 347         char macbuf[UWB_ADDR_STRSIZE], devbuf[UWB_ADDR_STRSIZE];
 348
 349         uwb_mac_addr_print(macbuf, sizeof(macbuf), &uwb_dev->mac_addr);
 350         uwb_dev_addr_print(devbuf, sizeof(devbuf), &uwb_dev->dev_addr);
 351         dev_info(dev, "uwb device (mac %s dev %s) disconnected from %s %s\n",
 352                  macbuf, devbuf,
 353                  rc ? rc->uwb_dev.dev.parent->bus->name : "n/a",
 354                  rc ? dev_name(rc->uwb_dev.dev.parent) : "");
 355         uwb_dev_rm(uwb_dev);
 356         list_del(&uwb_dev->bce->node);
 357         uwb_bce_put(uwb_dev->bce);
 358         uwb_dev_put(uwb_dev);   /* for the creation in _onair() */
 359
 360         return 0;
 361 }
 362
 363
 364 /**
 365  * A device went off the air, clean up after it!
 366  *
 367  * This is called by the UWB Daemon (through the beacon purge function
 368  * uwb_bcn_cache_purge) when it is detected that a device has been in
 369  * radio silence for a while.
 370  *
 371  * If this device is actually a local radio controller we don't need
 372  * to go through the offair process, as it is not registered as that.
 373  *
 374  * NOTE: uwb_bcn_cache.mutex is held!
 375  */
 376 void uwbd_dev_offair(struct uwb_beca_e *bce)
 377 {
 378         struct uwb_dev *uwb_dev;
 379
 380         uwb_dev = bce->uwb_dev;
 381         if (uwb_dev) {
 382                 uwb_notify(uwb_dev->rc, uwb_dev, UWB_NOTIF_OFFAIR);
 383                 __uwb_dev_offair(uwb_dev, uwb_dev->rc);
 384         }
 385 }
 386
 387
 388 /**
 389  * A device went on the air, start it up!
 390  *
 391  * This is called by the UWB Daemon when it is detected that a device
 392  * has popped up in the radio range of the radio controller.
 393  *
 394  * It will just create the freaking device, register the beacon and
 395  * stuff and yatla, done.
 396  *
 397  *
 398  * NOTE: uwb_beca.mutex is held, bce->mutex is held
 399  */
 400 void uwbd_dev_onair(struct uwb_rc *rc, struct uwb_beca_e *bce)
 401 {
 402         int result;
 403         struct device *dev = &rc->uwb_dev.dev;
 404         struct uwb_dev *uwb_dev;
 405         char macbuf[UWB_ADDR_STRSIZE], devbuf[UWB_ADDR_STRSIZE];
 406
 407         uwb_mac_addr_print(macbuf, sizeof(macbuf), bce->mac_addr);
 408         uwb_dev_addr_print(devbuf, sizeof(devbuf), &bce->dev_addr);
 409         uwb_dev = kzalloc(sizeof(struct uwb_dev), GFP_KERNEL);
 410         if (uwb_dev == NULL) {
 411                 dev_err(dev, "new device %s: Cannot allocate memory\n",
 412                         macbuf);
 413                 return;
 414         }
 415         uwb_dev_init(uwb_dev);          /* This sets refcnt to one, we own it */
 416         uwb_dev->mac_addr = *bce->mac_addr;
 417         uwb_dev->dev_addr = bce->dev_addr;
 418         dev_set_name(&uwb_dev->dev, macbuf);
 419         result = uwb_dev_add(uwb_dev, &rc->uwb_dev.dev, rc);
 420         if (result < 0) {
 421                 dev_err(dev, "new device %s: cannot instantiate device\n",
 422                         macbuf);
 423                 goto error_dev_add;
 424         }
 425         /* plug the beacon cache */
 426         bce->uwb_dev = uwb_dev;
 427         uwb_dev->bce = bce;
 428         uwb_bce_get(bce);               /* released in uwb_dev_sys_release() */
 429         dev_info(dev, "uwb device (mac %s dev %s) connected to %s %s\n",
 430                  macbuf, devbuf, rc->uwb_dev.dev.parent->bus->name,
 431                  dev_name(rc->uwb_dev.dev.parent));
 432         uwb_notify(rc, uwb_dev, UWB_NOTIF_ONAIR);
 433         return;
 434
 435 error_dev_add:
 436         kfree(uwb_dev);
 437         return;
 438 }
 439
 440 /**
 441  * Iterate over the list of UWB devices, calling a @function on each
 442  *
 443  * See docs for bus_for_each()....
 444  *
 445  * @rc:       radio controller for the devices.
 446  * @function: function to call.
 447  * @priv:     data to pass to @function.
 448  * @returns:  0 if no invocation of function() returned a value
 449  *            different to zero. That value otherwise.
 450  */
 451 int uwb_dev_for_each(struct uwb_rc *rc, uwb_dev_for_each_f function, void *priv)
 452 {
 453         return device_for_each_child(&rc->uwb_dev.dev, priv, function);
 454 }
 455 EXPORT_SYMBOL_GPL(uwb_dev_for_each);