drivers/uwb/wlp/sysfs.c

   1 /*
   2  * WiMedia Logical Link Control Protocol (WLP)
   3  * sysfs functions
   4  *
   5  * Copyright (C) 2007 Intel Corporation
   6  * Reinette Chatre <reinette.chatre@intel.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License version
  10  * 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA.
  21  *
  22  *
  23  * FIXME: Docs
  24  *
  25  */
  26 #include <linux/wlp.h>
  27
  28 #include "wlp-internal.h"
  29
  30 static
  31 size_t wlp_wss_wssid_e_print(char *buf, size_t bufsize,
  32                              struct wlp_wssid_e *wssid_e)
  33 {
  34         size_t used = 0;
  35         used += scnprintf(buf, bufsize, " WSS: ");
  36         used += wlp_wss_uuid_print(buf + used, bufsize - used,
  37                                    &wssid_e->wssid);
  38
  39         if (wssid_e->info != NULL) {
  40                 used += scnprintf(buf + used, bufsize - used, " ");
  41                 used += uwb_mac_addr_print(buf + used, bufsize - used,
  42                                            &wssid_e->info->bcast);
  43                 used += scnprintf(buf + used, bufsize - used, " %u %u %s\n",
  44                                   wssid_e->info->accept_enroll,
  45                                   wssid_e->info->sec_status,
  46                                   wssid_e->info->name);
  47         }
  48         return used;
  49 }
  50
  51 /**
  52  * Print out information learned from neighbor discovery
  53  *
  54  * Some fields being printed may not be included in the device discovery
  55  * information (it is not mandatory). We are thus careful how the
  56  * information is printed to ensure it is clear to the user what field is
  57  * being referenced.
  58  * The information being printed is for one time use - temporary storage is
  59  * cleaned after it is printed.
  60  *
  61  * Ideally sysfs output should be on one line. The information printed here
  62  * contain a few strings so it will be hard to parse if they are all
  63  * printed on the same line - without agreeing on a standard field
  64  * separator.
  65  */
  66 static
  67 ssize_t wlp_wss_neighborhood_print_remove(struct wlp *wlp, char *buf,
  68                                    size_t bufsize)
  69 {
  70         size_t used = 0;
  71         struct wlp_neighbor_e *neighb;
  72         struct wlp_wssid_e *wssid_e;
  73
  74         mutex_lock(&wlp->nbmutex);
  75         used = scnprintf(buf, bufsize, "#Neighbor information\n"
  76                          "#uuid dev_addr\n"
  77                          "# Device Name:\n# Model Name:\n# Manufacturer:\n"
  78                          "# Model Nr:\n# Serial:\n"
  79                          "# Pri Dev type: CategoryID OUI OUISubdiv "
  80                          "SubcategoryID\n"
  81                          "# WSS: WSSID WSS_name accept_enroll sec_status "
  82                          "bcast\n"
  83                          "# WSS: WSSID WSS_name accept_enroll sec_status "
  84                          "bcast\n\n");
  85         list_for_each_entry(neighb, &wlp->neighbors, node) {
  86                 if (bufsize - used <= 0)
  87                         goto out;
  88                 used += wlp_wss_uuid_print(buf + used, bufsize - used,
  89                                            &neighb->uuid);
  90                 buf[used++] = ' ';
  91                 used += uwb_dev_addr_print(buf + used, bufsize - used,
  92                                            &neighb->uwb_dev->dev_addr);
  93                 if (neighb->info != NULL)
  94                         used += scnprintf(buf + used, bufsize - used,
  95                                           "\n Device Name: %s\n"
  96                                           " Model Name: %s\n"
  97                                           " Manufacturer:%s \n"
  98                                           " Model Nr: %s\n"
  99                                           " Serial: %s\n"
 100                                           " Pri Dev type: "
 101                                           "%u %02x:%02x:%02x %u %u\n",
 102                                           neighb->info->name,
 103                                           neighb->info->model_name,
 104                                           neighb->info->manufacturer,
 105                                           neighb->info->model_nr,
 106                                           neighb->info->serial,
 107                                           neighb->info->prim_dev_type.category,
 108                                           neighb->info->prim_dev_type.OUI[0],
 109                                           neighb->info->prim_dev_type.OUI[1],
 110                                           neighb->info->prim_dev_type.OUI[2],
 111                                           neighb->info->prim_dev_type.OUIsubdiv,
 112                                           neighb->info->prim_dev_type.subID);
 113                 list_for_each_entry(wssid_e, &neighb->wssid, node) {
 114                         used += wlp_wss_wssid_e_print(buf + used,
 115                                                       bufsize - used,
 116                                                       wssid_e);
 117                 }
 118                 buf[used++] = '\n';
 119                 wlp_remove_neighbor_tmp_info(neighb);
 120         }
 121
 122
 123 out:
 124         mutex_unlock(&wlp->nbmutex);
 125         return used;
 126 }
 127
 128
 129 /**
 130  * Show properties of all WSS in neighborhood.
 131  *
 132  * Will trigger a complete discovery of WSS activated by this device and
 133  * its neighbors.
 134  */
 135 ssize_t wlp_neighborhood_show(struct wlp *wlp, char *buf)
 136 {
 137         wlp_discover(wlp);
 138         return wlp_wss_neighborhood_print_remove(wlp, buf, PAGE_SIZE);
 139 }
 140 EXPORT_SYMBOL_GPL(wlp_neighborhood_show);
 141
 142 static
 143 ssize_t __wlp_wss_properties_show(struct wlp_wss *wss, char *buf,
 144                                   size_t bufsize)
 145 {
 146         ssize_t result;
 147
 148         result = wlp_wss_uuid_print(buf, bufsize, &wss->wssid);
 149         result += scnprintf(buf + result, bufsize - result, " ");
 150         result += uwb_mac_addr_print(buf + result, bufsize - result,
 151                                      &wss->bcast);
 152         result += scnprintf(buf + result, bufsize - result,
 153                             " 0x%02x %u ", wss->hash, wss->secure_status);
 154         result += wlp_wss_key_print(buf + result, bufsize - result,
 155                                     wss->master_key);
 156         result += scnprintf(buf + result, bufsize - result, " 0x%02x ",
 157                             wss->tag);
 158         result += uwb_mac_addr_print(buf + result, bufsize - result,
 159                                      &wss->virtual_addr);
 160         result += scnprintf(buf + result, bufsize - result, " %s", wss->name);
 161         result += scnprintf(buf + result, bufsize - result,
 162                             "\n\n#WSSID\n#WSS broadcast address\n"
 163                             "#WSS hash\n#WSS secure status\n"
 164                             "#WSS master key\n#WSS local tag\n"
 165                             "#WSS local virtual EUI-48\n#WSS name\n");
 166         return result;
 167 }
 168
 169 /**
 170  * Show which WSS is activated.
 171  */
 172 ssize_t wlp_wss_activate_show(struct wlp_wss *wss, char *buf)
 173 {
 174         int result = 0;
 175
 176         if (mutex_lock_interruptible(&wss->mutex))
 177                 goto out;
 178         if (wss->state >= WLP_WSS_STATE_ACTIVE)
 179                 result = __wlp_wss_properties_show(wss, buf, PAGE_SIZE);
 180         else
 181                 result = scnprintf(buf, PAGE_SIZE, "No local WSS active.\n");
 182         result += scnprintf(buf + result, PAGE_SIZE - result,
 183                         "\n\n"
 184                         "# echo WSSID SECURE_STATUS ACCEPT_ENROLLMENT "
 185                         "NAME #create new WSS\n"
 186                         "# echo WSSID [DEV ADDR] #enroll in and activate "
 187                         "existing WSS, can request registrar\n"
 188                         "#\n"
 189                         "# WSSID is a 16 byte hex array. Eg. 12 A3 3B ... \n"
 190                         "# SECURE_STATUS 0 - unsecure, 1 - secure (default)\n"
 191                         "# ACCEPT_ENROLLMENT 0 - no, 1 - yes (default)\n"
 192                         "# NAME is the text string identifying the WSS\n"
 193                         "# DEV ADDR is the device address of neighbor "
 194                         "that should be registrar. Eg. 32:AB\n");
 195
 196         mutex_unlock(&wss->mutex);
 197 out:
 198         return result;
 199
 200 }
 201 EXPORT_SYMBOL_GPL(wlp_wss_activate_show);
 202
 203 /**
 204  * Create/activate a new WSS or enroll/activate in neighboring WSS
 205  *
 206  * The user can provide the WSSID of a WSS in which it wants to enroll.
 207  * Only the WSSID is necessary if the WSS have been discovered before. If
 208  * the WSS has not been discovered before, or the user wants to use a
 209  * particular neighbor as its registrar, then the user can also provide a
 210  * device address or the neighbor that will be used as registrar.
 211  *
 212  * A new WSS is created when the user provides a WSSID, secure status, and
 213  * WSS name.
 214  */
 215 ssize_t wlp_wss_activate_store(struct wlp_wss *wss,
 216                                const char *buf, size_t size)
 217 {
 218         ssize_t result = -EINVAL;
 219         struct wlp_uuid wssid;
 220         struct uwb_dev_addr dev;
 221         struct uwb_dev_addr bcast = {.data = {0xff, 0xff} };
 222         char name[65];
 223         unsigned sec_status, accept;
 224         memset(name, 0, sizeof(name));
 225         result = sscanf(buf, "%02hhx %02hhx %02hhx %02hhx "
 226                         "%02hhx %02hhx %02hhx %02hhx "
 227                         "%02hhx %02hhx %02hhx %02hhx "
 228                         "%02hhx %02hhx %02hhx %02hhx "
 229                         "%02hhx:%02hhx",
 230                         &wssid.data[0] , &wssid.data[1],
 231                         &wssid.data[2] , &wssid.data[3],
 232                         &wssid.data[4] , &wssid.data[5],
 233                         &wssid.data[6] , &wssid.data[7],
 234                         &wssid.data[8] , &wssid.data[9],
 235                         &wssid.data[10], &wssid.data[11],
 236                         &wssid.data[12], &wssid.data[13],
 237                         &wssid.data[14], &wssid.data[15],
 238                         &dev.data[1], &dev.data[0]);
 239         if (result == 16 || result == 17) {
 240                 result = sscanf(buf, "%02hhx %02hhx %02hhx %02hhx "
 241                                 "%02hhx %02hhx %02hhx %02hhx "
 242                                 "%02hhx %02hhx %02hhx %02hhx "
 243                                 "%02hhx %02hhx %02hhx %02hhx "
 244                                 "%u %u %64c",
 245                                 &wssid.data[0] , &wssid.data[1],
 246                                 &wssid.data[2] , &wssid.data[3],
 247                                 &wssid.data[4] , &wssid.data[5],
 248                                 &wssid.data[6] , &wssid.data[7],
 249                                 &wssid.data[8] , &wssid.data[9],
 250                                 &wssid.data[10], &wssid.data[11],
 251                                 &wssid.data[12], &wssid.data[13],
 252                                 &wssid.data[14], &wssid.data[15],
 253                                 &sec_status, &accept, name);
 254                 if (result == 16)
 255                         result = wlp_wss_enroll_activate(wss, &wssid, &bcast);
 256                 else if (result == 19) {
 257                         sec_status = sec_status == 0 ? 0 : 1;
 258                         accept = accept == 0 ? 0 : 1;
 259                         /* We read name using %c, so the newline needs to be
 260                          * removed */
 261                         if (strlen(name) != sizeof(name) - 1)
 262                                 name[strlen(name) - 1] = '\0';
 263                         result = wlp_wss_create_activate(wss, &wssid, name,
 264                                                          sec_status, accept);
 265                 } else
 266                         result = -EINVAL;
 267         } else if (result == 18)
 268                 result = wlp_wss_enroll_activate(wss, &wssid, &dev);
 269         else
 270                 result = -EINVAL;
 271         return result < 0 ? result : size;
 272 }
 273 EXPORT_SYMBOL_GPL(wlp_wss_activate_store);
 274
 275 /**
 276  * Show the UUID of this host
 277  */
 278 ssize_t wlp_uuid_show(struct wlp *wlp, char *buf)
 279 {
 280         ssize_t result = 0;
 281
 282         mutex_lock(&wlp->mutex);
 283         result = wlp_wss_uuid_print(buf, PAGE_SIZE, &wlp->uuid);
 284         buf[result++] = '\n';
 285         mutex_unlock(&wlp->mutex);
 286         return result;
 287 }
 288 EXPORT_SYMBOL_GPL(wlp_uuid_show);
 289
 290 /**
 291  * Store a new UUID for this host
 292  *
 293  * According to the spec this should be encoded as an octet string in the
 294  * order the octets are shown in string representation in RFC 4122 (WLP
 295  * 0.99 [Table 6])
 296  *
 297  * We do not check value provided by user.
 298  */
 299 ssize_t wlp_uuid_store(struct wlp *wlp, const char *buf, size_t size)
 300 {
 301         ssize_t result;
 302         struct wlp_uuid uuid;
 303
 304         mutex_lock(&wlp->mutex);
 305         result = sscanf(buf, "%02hhx %02hhx %02hhx %02hhx "
 306                         "%02hhx %02hhx %02hhx %02hhx "
 307                         "%02hhx %02hhx %02hhx %02hhx "
 308                         "%02hhx %02hhx %02hhx %02hhx ",
 309                         &uuid.data[0] , &uuid.data[1],
 310                         &uuid.data[2] , &uuid.data[3],
 311                         &uuid.data[4] , &uuid.data[5],
 312                         &uuid.data[6] , &uuid.data[7],
 313                         &uuid.data[8] , &uuid.data[9],
 314                         &uuid.data[10], &uuid.data[11],
 315                         &uuid.data[12], &uuid.data[13],
 316                         &uuid.data[14], &uuid.data[15]);
 317         if (result != 16) {
 318                 result = -EINVAL;
 319                 goto error;
 320         }
 321         wlp->uuid = uuid;
 322 error:
 323         mutex_unlock(&wlp->mutex);
 324         return result < 0 ? result : size;
 325 }
 326 EXPORT_SYMBOL_GPL(wlp_uuid_store);
 327
 328 /**
 329  * Show contents of members of device information structure
 330  */
 331 #define wlp_dev_info_show(type)                                         \
 332 ssize_t wlp_dev_##type##_show(struct wlp *wlp, char *buf)               \
 333 {                                                                       \
 334         ssize_t result = 0;                                             \
 335         mutex_lock(&wlp->mutex);                                        \
 336         if (wlp->dev_info == NULL) {                                    \
 337                 result = __wlp_setup_device_info(wlp);                  \
 338                 if (result < 0)                                         \
 339                         goto out;                                       \
 340         }                                                               \
 341         result = scnprintf(buf, PAGE_SIZE, "%s\n", wlp->dev_info->type);\
 342 out:                                                                    \
 343         mutex_unlock(&wlp->mutex);                                      \
 344         return result;                                                  \
 345 }                                                                       \
 346 EXPORT_SYMBOL_GPL(wlp_dev_##type##_show);
 347
 348 wlp_dev_info_show(name)
 349 wlp_dev_info_show(model_name)
 350 wlp_dev_info_show(model_nr)
 351 wlp_dev_info_show(manufacturer)
 352 wlp_dev_info_show(serial)
 353
 354 /**
 355  * Store contents of members of device information structure
 356  */
 357 #define wlp_dev_info_store(type, len)                                   \
 358 ssize_t wlp_dev_##type##_store(struct wlp *wlp, const char *buf, size_t size)\
 359 {                                                                       \
 360         ssize_t result;                                                 \
 361         char format[10];                                                \
 362         mutex_lock(&wlp->mutex);                                        \
 363         if (wlp->dev_info == NULL) {                                    \
 364                 result = __wlp_alloc_device_info(wlp);                  \
 365                 if (result < 0)                                         \
 366                         goto out;                                       \
 367         }                                                               \
 368         memset(wlp->dev_info->type, 0, sizeof(wlp->dev_info->type));    \
 369         sprintf(format, "%%%uc", len);                                  \
 370         result = sscanf(buf, format, wlp->dev_info->type);              \
 371 out:                                                                    \
 372         mutex_unlock(&wlp->mutex);                                      \
 373         return result < 0 ? result : size;                              \
 374 }                                                                       \
 375 EXPORT_SYMBOL_GPL(wlp_dev_##type##_store);
 376
 377 wlp_dev_info_store(name, 32)
 378 wlp_dev_info_store(manufacturer, 64)
 379 wlp_dev_info_store(model_name, 32)
 380 wlp_dev_info_store(model_nr, 32)
 381 wlp_dev_info_store(serial, 32)
 382
 383 static
 384 const char *__wlp_dev_category[] = {
 385         [WLP_DEV_CAT_COMPUTER] = "Computer",
 386         [WLP_DEV_CAT_INPUT] = "Input device",
 387         [WLP_DEV_CAT_PRINT_SCAN_FAX_COPIER] = "Printer, scanner, FAX, or "
 388                                               "Copier",
 389         [WLP_DEV_CAT_CAMERA] = "Camera",
 390         [WLP_DEV_CAT_STORAGE] = "Storage Network",
 391         [WLP_DEV_CAT_INFRASTRUCTURE] = "Infrastructure",
 392         [WLP_DEV_CAT_DISPLAY] = "Display",
 393         [WLP_DEV_CAT_MULTIM] = "Multimedia device",
 394         [WLP_DEV_CAT_GAMING] = "Gaming device",
 395         [WLP_DEV_CAT_TELEPHONE] = "Telephone",
 396         [WLP_DEV_CAT_OTHER] = "Other",
 397 };
 398
 399 static
 400 const char *wlp_dev_category_str(unsigned cat)
 401 {
 402         if ((cat >= WLP_DEV_CAT_COMPUTER && cat <= WLP_DEV_CAT_TELEPHONE)
 403             || cat == WLP_DEV_CAT_OTHER)
 404                 return __wlp_dev_category[cat];
 405         return "unknown category";
 406 }
 407
 408 ssize_t wlp_dev_prim_category_show(struct wlp *wlp, char *buf)
 409 {
 410         ssize_t result = 0;
 411         mutex_lock(&wlp->mutex);
 412         if (wlp->dev_info == NULL) {
 413                 result = __wlp_setup_device_info(wlp);
 414                 if (result < 0)
 415                         goto out;
 416         }
 417         result = scnprintf(buf, PAGE_SIZE, "%s\n",
 418                   wlp_dev_category_str(wlp->dev_info->prim_dev_type.category));
 419 out:
 420         mutex_unlock(&wlp->mutex);
 421         return result;
 422 }
 423 EXPORT_SYMBOL_GPL(wlp_dev_prim_category_show);
 424
 425 ssize_t wlp_dev_prim_category_store(struct wlp *wlp, const char *buf,
 426                                     size_t size)
 427 {
 428         ssize_t result;
 429         u16 cat;
 430         mutex_lock(&wlp->mutex);
 431         if (wlp->dev_info == NULL) {
 432                 result = __wlp_alloc_device_info(wlp);
 433                 if (result < 0)
 434                         goto out;
 435         }
 436         result = sscanf(buf, "%hu", &cat);
 437         if ((cat >= WLP_DEV_CAT_COMPUTER && cat <= WLP_DEV_CAT_TELEPHONE)
 438             || cat == WLP_DEV_CAT_OTHER)
 439                 wlp->dev_info->prim_dev_type.category = cat;
 440         else
 441                 result = -EINVAL;
 442 out:
 443         mutex_unlock(&wlp->mutex);
 444         return result < 0 ? result : size;
 445 }
 446 EXPORT_SYMBOL_GPL(wlp_dev_prim_category_store);
 447
 448 ssize_t wlp_dev_prim_OUI_show(struct wlp *wlp, char *buf)
 449 {
 450         ssize_t result = 0;
 451         mutex_lock(&wlp->mutex);
 452         if (wlp->dev_info == NULL) {
 453                 result = __wlp_setup_device_info(wlp);
 454                 if (result < 0)
 455                         goto out;
 456         }
 457         result = scnprintf(buf, PAGE_SIZE, "%02x:%02x:%02x\n",
 458                            wlp->dev_info->prim_dev_type.OUI[0],
 459                            wlp->dev_info->prim_dev_type.OUI[1],
 460                            wlp->dev_info->prim_dev_type.OUI[2]);
 461 out:
 462         mutex_unlock(&wlp->mutex);
 463         return result;
 464 }
 465 EXPORT_SYMBOL_GPL(wlp_dev_prim_OUI_show);
 466
 467 ssize_t wlp_dev_prim_OUI_store(struct wlp *wlp, const char *buf, size_t size)
 468 {
 469         ssize_t result;
 470         u8 OUI[3];
 471         mutex_lock(&wlp->mutex);
 472         if (wlp->dev_info == NULL) {
 473                 result = __wlp_alloc_device_info(wlp);
 474                 if (result < 0)
 475                         goto out;
 476         }
 477         result = sscanf(buf, "%hhx:%hhx:%hhx",
 478                         &OUI[0], &OUI[1], &OUI[2]);
 479         if (result != 3) {
 480                 result = -EINVAL;
 481                 goto out;
 482         } else
 483                 memcpy(wlp->dev_info->prim_dev_type.OUI, OUI, sizeof(OUI));
 484 out:
 485         mutex_unlock(&wlp->mutex);
 486         return result < 0 ? result : size;
 487 }
 488 EXPORT_SYMBOL_GPL(wlp_dev_prim_OUI_store);
 489
 490
 491 ssize_t wlp_dev_prim_OUI_sub_show(struct wlp *wlp, char *buf)
 492 {
 493         ssize_t result = 0;
 494         mutex_lock(&wlp->mutex);
 495         if (wlp->dev_info == NULL) {
 496                 result = __wlp_setup_device_info(wlp);
 497                 if (result < 0)
 498                         goto out;
 499         }
 500         result = scnprintf(buf, PAGE_SIZE, "%u\n",
 501                            wlp->dev_info->prim_dev_type.OUIsubdiv);
 502 out:
 503         mutex_unlock(&wlp->mutex);
 504         return result;
 505 }
 506 EXPORT_SYMBOL_GPL(wlp_dev_prim_OUI_sub_show);
 507
 508 ssize_t wlp_dev_prim_OUI_sub_store(struct wlp *wlp, const char *buf,
 509                                    size_t size)
 510 {
 511         ssize_t result;
 512         unsigned sub;
 513         u8 max_sub = ~0;
 514         mutex_lock(&wlp->mutex);
 515         if (wlp->dev_info == NULL) {
 516                 result = __wlp_alloc_device_info(wlp);
 517                 if (result < 0)
 518                         goto out;
 519         }
 520         result = sscanf(buf, "%u", &sub);
 521         if (sub <= max_sub)
 522                 wlp->dev_info->prim_dev_type.OUIsubdiv = sub;
 523         else
 524                 result = -EINVAL;
 525 out:
 526         mutex_unlock(&wlp->mutex);
 527         return result < 0 ? result : size;
 528 }
 529 EXPORT_SYMBOL_GPL(wlp_dev_prim_OUI_sub_store);
 530
 531 ssize_t wlp_dev_prim_subcat_show(struct wlp *wlp, char *buf)
 532 {
 533         ssize_t result = 0;
 534         mutex_lock(&wlp->mutex);
 535         if (wlp->dev_info == NULL) {
 536                 result = __wlp_setup_device_info(wlp);
 537                 if (result < 0)
 538                         goto out;
 539         }
 540         result = scnprintf(buf, PAGE_SIZE, "%u\n",
 541                            wlp->dev_info->prim_dev_type.subID);
 542 out:
 543         mutex_unlock(&wlp->mutex);
 544         return result;
 545 }
 546 EXPORT_SYMBOL_GPL(wlp_dev_prim_subcat_show);
 547
 548 ssize_t wlp_dev_prim_subcat_store(struct wlp *wlp, const char *buf,
 549                                   size_t size)
 550 {
 551         ssize_t result;
 552         unsigned sub;
 553         __le16 max_sub = ~0;
 554         mutex_lock(&wlp->mutex);
 555         if (wlp->dev_info == NULL) {
 556                 result = __wlp_alloc_device_info(wlp);
 557                 if (result < 0)
 558                         goto out;
 559         }
 560         result = sscanf(buf, "%u", &sub);
 561         if (sub <= max_sub)
 562                 wlp->dev_info->prim_dev_type.subID = sub;
 563         else
 564                 result = -EINVAL;
 565 out:
 566         mutex_unlock(&wlp->mutex);
 567         return result < 0 ? result : size;
 568 }
 569 EXPORT_SYMBOL_GPL(wlp_dev_prim_subcat_store);
 570
 571 /**
 572  * Subsystem implementation for interaction with individual WSS via sysfs
 573  *
 574  * Followed instructions for subsystem in Documentation/filesystems/sysfs.txt
 575  */
 576
 577 #define kobj_to_wlp_wss(obj) container_of(obj, struct wlp_wss, kobj)
 578 #define attr_to_wlp_wss_attr(_attr) \
 579         container_of(_attr, struct wlp_wss_attribute, attr)
 580
 581 /**
 582  * Sysfs subsystem: forward read calls
 583  *
 584  * Sysfs operation for forwarding read call to the show method of the
 585  * attribute owner
 586  */
 587 static
 588 ssize_t wlp_wss_attr_show(struct kobject *kobj, struct attribute *attr,
 589                           char *buf)
 590 {
 591         struct wlp_wss_attribute *wss_attr = attr_to_wlp_wss_attr(attr);
 592         struct wlp_wss *wss = kobj_to_wlp_wss(kobj);
 593         ssize_t ret = -EIO;
 594
 595         if (wss_attr->show)
 596                 ret = wss_attr->show(wss, buf);
 597         return ret;
 598 }
 599 /**
 600  * Sysfs subsystem: forward write calls
 601  *
 602  * Sysfs operation for forwarding write call to the store method of the
 603  * attribute owner
 604  */
 605 static
 606 ssize_t wlp_wss_attr_store(struct kobject *kobj, struct attribute *attr,
 607                            const char *buf, size_t count)
 608 {
 609         struct wlp_wss_attribute *wss_attr = attr_to_wlp_wss_attr(attr);
 610         struct wlp_wss *wss = kobj_to_wlp_wss(kobj);
 611         ssize_t ret = -EIO;
 612
 613         if (wss_attr->store)
 614                 ret = wss_attr->store(wss, buf, count);
 615         return ret;
 616 }
 617
 618 static
 619 struct sysfs_ops wss_sysfs_ops = {
 620         .show   = wlp_wss_attr_show,
 621         .store  = wlp_wss_attr_store,
 622 };
 623
 624 struct kobj_type wss_ktype = {
 625         .release        = wlp_wss_release,
 626         .sysfs_ops      = &wss_sysfs_ops,
 627 };
 628
 629
 630 /**
 631  * Sysfs files for individual WSS
 632  */
 633
 634 /**
 635  * Print static properties of this WSS
 636  *
 637  * The name of a WSS may not be null teminated. It's max size is 64 bytes
 638  * so we copy it to a larger array just to make sure we print sane data.
 639  */
 640 static ssize_t wlp_wss_properties_show(struct wlp_wss *wss, char *buf)
 641 {
 642         int result = 0;
 643
 644         if (mutex_lock_interruptible(&wss->mutex))
 645                 goto out;
 646         result = __wlp_wss_properties_show(wss, buf, PAGE_SIZE);
 647         mutex_unlock(&wss->mutex);
 648 out:
 649         return result;
 650 }
 651 WSS_ATTR(properties, S_IRUGO, wlp_wss_properties_show, NULL);
 652
 653 /**
 654  * Print all connected members of this WSS
 655  * The EDA cache contains all members of WSS neighborhood.
 656  */
 657 static ssize_t wlp_wss_members_show(struct wlp_wss *wss, char *buf)
 658 {
 659         struct wlp *wlp = container_of(wss, struct wlp, wss);
 660         return wlp_eda_show(wlp, buf);
 661 }
 662 WSS_ATTR(members, S_IRUGO, wlp_wss_members_show, NULL);
 663
 664 static
 665 const char *__wlp_strstate[] = {
 666         "none",
 667         "partially enrolled",
 668         "enrolled",
 669         "active",
 670         "connected",
 671 };
 672
 673 static const char *wlp_wss_strstate(unsigned state)
 674 {
 675         if (state >= ARRAY_SIZE(__wlp_strstate))
 676                 return "unknown state";
 677         return __wlp_strstate[state];
 678 }
 679
 680 /*
 681  * Print current state of this WSS
 682  */
 683 static ssize_t wlp_wss_state_show(struct wlp_wss *wss, char *buf)
 684 {
 685         int result = 0;
 686
 687         if (mutex_lock_interruptible(&wss->mutex))
 688                 goto out;
 689         result = scnprintf(buf, PAGE_SIZE, "%s\n",
 690                            wlp_wss_strstate(wss->state));
 691         mutex_unlock(&wss->mutex);
 692 out:
 693         return result;
 694 }
 695 WSS_ATTR(state, S_IRUGO, wlp_wss_state_show, NULL);
 696
 697
 698 static
 699 struct attribute *wss_attrs[] = {
 700         &wss_attr_properties.attr,
 701         &wss_attr_members.attr,
 702         &wss_attr_state.attr,
 703         NULL,
 704 };
 705
 706 struct attribute_group wss_attr_group = {
 707         .name = NULL,   /* we want them in the same directory */
 708         .attrs = wss_attrs,
 709 };