drivers/net/wireless/b43/debugfs.c

   1 /*
   2
   3   Broadcom B43 wireless driver
   4
   5   debugfs driver debugging code
   6
   7   Copyright (c) 2005-2007 Michael Buesch <mb@bu3sch.de>
   8
   9   This program is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU General Public License as published by
  11   the Free Software Foundation; either version 2 of the License, or
  12   (at your option) any later version.
  13
  14   This program is distributed in the hope that it will be useful,
  15   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17   GNU General Public License for more details.
  18
  19   You should have received a copy of the GNU General Public License
  20   along with this program; see the file COPYING.  If not, write to
  21   the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  22   Boston, MA 02110-1301, USA.
  23
  24 */
  25
  26 #include <linux/fs.h>
  27 #include <linux/debugfs.h>
  28 #include <linux/slab.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/pci.h>
  31 #include <linux/mutex.h>
  32
  33 #include "b43.h"
  34 #include "main.h"
  35 #include "debugfs.h"
  36 #include "dma.h"
  37 #include "xmit.h"
  38
  39
  40 /* The root directory. */
  41 static struct dentry *rootdir;
  42
  43 struct b43_debugfs_fops {
  44         ssize_t (*read)(struct b43_wldev *dev, char *buf, size_t bufsize);
  45         int (*write)(struct b43_wldev *dev, const char *buf, size_t count);
  46         struct file_operations fops;
  47         /* Offset of struct b43_dfs_file in struct b43_dfsentry */
  48         size_t file_struct_offset;
  49         /* Take wl->irq_lock before calling read/write? */
  50         bool take_irqlock;
  51 };
  52
  53 static inline
  54 struct b43_dfs_file * fops_to_dfs_file(struct b43_wldev *dev,
  55                                        const struct b43_debugfs_fops *dfops)
  56 {
  57         void *p;
  58
  59         p = dev->dfsentry;
  60         p += dfops->file_struct_offset;
  61
  62         return p;
  63 }
  64
  65
  66 #define fappend(fmt, x...)      \
  67         do {                                                    \
  68                 if (bufsize - count)                            \
  69                         count += snprintf(buf + count,          \
  70                                           bufsize - count,      \
  71                                           fmt , ##x);           \
  72                 else                                            \
  73                         printk(KERN_ERR "b43: fappend overflow\n"); \
  74         } while (0)
  75
  76
  77 /* wl->irq_lock is locked */
  78 static ssize_t tsf_read_file(struct b43_wldev *dev,
  79                              char *buf, size_t bufsize)
  80 {
  81         ssize_t count = 0;
  82         u64 tsf;
  83
  84         b43_tsf_read(dev, &tsf);
  85         fappend("0x%08x%08x\n",
  86                 (unsigned int)((tsf & 0xFFFFFFFF00000000ULL) >> 32),
  87                 (unsigned int)(tsf & 0xFFFFFFFFULL));
  88
  89         return count;
  90 }
  91
  92 /* wl->irq_lock is locked */
  93 static int tsf_write_file(struct b43_wldev *dev,
  94                           const char *buf, size_t count)
  95 {
  96         u64 tsf;
  97
  98         if (sscanf(buf, "%llu", (unsigned long long *)(&tsf)) != 1)
  99                 return -EINVAL;
 100         b43_tsf_write(dev, tsf);
 101
 102         return 0;
 103 }
 104
 105 /* wl->irq_lock is locked */
 106 static ssize_t ucode_regs_read_file(struct b43_wldev *dev,
 107                                     char *buf, size_t bufsize)
 108 {
 109         ssize_t count = 0;
 110         int i;
 111
 112         for (i = 0; i < 64; i++) {
 113                 fappend("r%d = 0x%04x\n", i,
 114                         b43_shm_read16(dev, B43_SHM_SCRATCH, i));
 115         }
 116
 117         return count;
 118 }
 119
 120 /* wl->irq_lock is locked */
 121 static ssize_t shm_read_file(struct b43_wldev *dev,
 122                              char *buf, size_t bufsize)
 123 {
 124         ssize_t count = 0;
 125         int i;
 126         u16 tmp;
 127         __le16 *le16buf = (__le16 *)buf;
 128
 129         for (i = 0; i < 0x1000; i++) {
 130                 if (bufsize < sizeof(tmp))
 131                         break;
 132                 tmp = b43_shm_read16(dev, B43_SHM_SHARED, 2 * i);
 133                 le16buf[i] = cpu_to_le16(tmp);
 134                 count += sizeof(tmp);
 135                 bufsize -= sizeof(tmp);
 136         }
 137
 138         return count;
 139 }
 140
 141 static ssize_t txstat_read_file(struct b43_wldev *dev,
 142                                 char *buf, size_t bufsize)
 143 {
 144         struct b43_txstatus_log *log = &dev->dfsentry->txstatlog;
 145         ssize_t count = 0;
 146         unsigned long flags;
 147         int i, idx;
 148         struct b43_txstatus *stat;
 149
 150         spin_lock_irqsave(&log->lock, flags);
 151         if (log->end < 0) {
 152                 fappend("Nothing transmitted, yet\n");
 153                 goto out_unlock;
 154         }
 155         fappend("b43 TX status reports:\n\n"
 156                 "index | cookie | seq | phy_stat | frame_count | "
 157                 "rts_count | supp_reason | pm_indicated | "
 158                 "intermediate | for_ampdu | acked\n" "---\n");
 159         i = log->end + 1;
 160         idx = 0;
 161         while (1) {
 162                 if (i == B43_NR_LOGGED_TXSTATUS)
 163                         i = 0;
 164                 stat = &(log->log[i]);
 165                 if (stat->cookie) {
 166                         fappend("%03d | "
 167                                 "0x%04X | 0x%04X | 0x%02X | "
 168                                 "0x%X | 0x%X | "
 169                                 "%u | %u | "
 170                                 "%u | %u | %u\n",
 171                                 idx,
 172                                 stat->cookie, stat->seq, stat->phy_stat,
 173                                 stat->frame_count, stat->rts_count,
 174                                 stat->supp_reason, stat->pm_indicated,
 175                                 stat->intermediate, stat->for_ampdu,
 176                                 stat->acked);
 177                         idx++;
 178                 }
 179                 if (i == log->end)
 180                         break;
 181                 i++;
 182         }
 183 out_unlock:
 184         spin_unlock_irqrestore(&log->lock, flags);
 185
 186         return count;
 187 }
 188
 189 static ssize_t txpower_g_read_file(struct b43_wldev *dev,
 190                                    char *buf, size_t bufsize)
 191 {
 192         ssize_t count = 0;
 193
 194         if (dev->phy.type != B43_PHYTYPE_G) {
 195                 fappend("Device is not a G-PHY\n");
 196                 goto out;
 197         }
 198         fappend("Control:               %s\n", dev->phy.manual_txpower_control ?
 199                 "MANUAL" : "AUTOMATIC");
 200         fappend("Baseband attenuation:  %u\n", dev->phy.bbatt.att);
 201         fappend("Radio attenuation:     %u\n", dev->phy.rfatt.att);
 202         fappend("TX Mixer Gain:         %s\n",
 203                 (dev->phy.tx_control & B43_TXCTL_TXMIX) ? "ON" : "OFF");
 204         fappend("PA Gain 2dB:           %s\n",
 205                 (dev->phy.tx_control & B43_TXCTL_PA2DB) ? "ON" : "OFF");
 206         fappend("PA Gain 3dB:           %s\n",
 207                 (dev->phy.tx_control & B43_TXCTL_PA3DB) ? "ON" : "OFF");
 208         fappend("\n\n");
 209         fappend("You can write to this file:\n");
 210         fappend("Writing \"auto\" enables automatic txpower control.\n");
 211         fappend
 212             ("Writing the attenuation values as \"bbatt rfatt txmix pa2db pa3db\" "
 213              "enables manual txpower control.\n");
 214         fappend("Example: 5 4 0 0 1\n");
 215         fappend("Enables manual control with Baseband attenuation 5, "
 216                 "Radio attenuation 4, No TX Mixer Gain, "
 217                 "No PA Gain 2dB, With PA Gain 3dB.\n");
 218 out:
 219         return count;
 220 }
 221
 222 static int txpower_g_write_file(struct b43_wldev *dev,
 223                                 const char *buf, size_t count)
 224 {
 225         unsigned long phy_flags;
 226
 227         if (dev->phy.type != B43_PHYTYPE_G)
 228                 return -ENODEV;
 229         if ((count >= 4) && (memcmp(buf, "auto", 4) == 0)) {
 230                 /* Automatic control */
 231                 dev->phy.manual_txpower_control = 0;
 232                 b43_phy_xmitpower(dev);
 233         } else {
 234                 int bbatt = 0, rfatt = 0, txmix = 0, pa2db = 0, pa3db = 0;
 235                 /* Manual control */
 236                 if (sscanf(buf, "%d %d %d %d %d", &bbatt, &rfatt,
 237                            &txmix, &pa2db, &pa3db) != 5)
 238                         return -EINVAL;
 239                 b43_put_attenuation_into_ranges(dev, &bbatt, &rfatt);
 240                 dev->phy.manual_txpower_control = 1;
 241                 dev->phy.bbatt.att = bbatt;
 242                 dev->phy.rfatt.att = rfatt;
 243                 dev->phy.tx_control = 0;
 244                 if (txmix)
 245                         dev->phy.tx_control |= B43_TXCTL_TXMIX;
 246                 if (pa2db)
 247                         dev->phy.tx_control |= B43_TXCTL_PA2DB;
 248                 if (pa3db)
 249                         dev->phy.tx_control |= B43_TXCTL_PA3DB;
 250                 b43_phy_lock(dev, phy_flags);
 251                 b43_radio_lock(dev);
 252                 b43_set_txpower_g(dev, &dev->phy.bbatt,
 253                                   &dev->phy.rfatt, dev->phy.tx_control);
 254                 b43_radio_unlock(dev);
 255                 b43_phy_unlock(dev, phy_flags);
 256         }
 257
 258         return 0;
 259 }
 260
 261 /* wl->irq_lock is locked */
 262 static int restart_write_file(struct b43_wldev *dev,
 263                               const char *buf, size_t count)
 264 {
 265         int err = 0;
 266
 267         if (count > 0 && buf[0] == '1') {
 268                 b43_controller_restart(dev, "manually restarted");
 269         } else
 270                 err = -EINVAL;
 271
 272         return err;
 273 }
 274
 275 static ssize_t append_lo_table(ssize_t count, char *buf, const size_t bufsize,
 276                                struct b43_loctl table[B43_NR_BB][B43_NR_RF])
 277 {
 278         unsigned int i, j;
 279         struct b43_loctl *ctl;
 280
 281         for (i = 0; i < B43_NR_BB; i++) {
 282                 for (j = 0; j < B43_NR_RF; j++) {
 283                         ctl = &(table[i][j]);
 284                         fappend("(bbatt %2u, rfatt %2u)  ->  "
 285                                 "(I %+3d, Q %+3d, Used: %d, Calibrated: %d)\n",
 286                                 i, j, ctl->i, ctl->q,
 287                                 ctl->used,
 288                                 b43_loctl_is_calibrated(ctl));
 289                 }
 290         }
 291
 292         return count;
 293 }
 294
 295 static ssize_t loctls_read_file(struct b43_wldev *dev,
 296                                 char *buf, size_t bufsize)
 297 {
 298         ssize_t count = 0;
 299         struct b43_txpower_lo_control *lo;
 300         int i, err = 0;
 301
 302         if (dev->phy.type != B43_PHYTYPE_G) {
 303                 fappend("Device is not a G-PHY\n");
 304                 err = -ENODEV;
 305                 goto out;
 306         }
 307         lo = dev->phy.lo_control;
 308         fappend("-- Local Oscillator calibration data --\n\n");
 309         fappend("Measured: %d,  Rebuild: %d,  HW-power-control: %d\n",
 310                 lo->lo_measured,
 311                 lo->rebuild,
 312                 dev->phy.hardware_power_control);
 313         fappend("TX Bias: 0x%02X,  TX Magn: 0x%02X\n",
 314                 lo->tx_bias, lo->tx_magn);
 315         fappend("Power Vector: 0x%08X%08X\n",
 316                 (unsigned int)((lo->power_vector & 0xFFFFFFFF00000000ULL) >> 32),
 317                 (unsigned int)(lo->power_vector & 0x00000000FFFFFFFFULL));
 318         fappend("\nControl table WITH PADMIX:\n");
 319         count = append_lo_table(count, buf, bufsize, lo->with_padmix);
 320         fappend("\nControl table WITHOUT PADMIX:\n");
 321         count = append_lo_table(count, buf, bufsize, lo->no_padmix);
 322         fappend("\nUsed RF attenuation values:  Value(WithPadmix flag)\n");
 323         for (i = 0; i < lo->rfatt_list.len; i++) {
 324                 fappend("%u(%d), ",
 325                         lo->rfatt_list.list[i].att,
 326                         lo->rfatt_list.list[i].with_padmix);
 327         }
 328         fappend("\n");
 329         fappend("\nUsed Baseband attenuation values:\n");
 330         for (i = 0; i < lo->bbatt_list.len; i++) {
 331                 fappend("%u, ",
 332                         lo->bbatt_list.list[i].att);
 333         }
 334         fappend("\n");
 335
 336 out:
 337         return err ? err : count;
 338 }
 339
 340 #undef fappend
 341
 342 static int b43_debugfs_open(struct inode *inode, struct file *file)
 343 {
 344         file->private_data = inode->i_private;
 345         return 0;
 346 }
 347
 348 static ssize_t b43_debugfs_read(struct file *file, char __user *userbuf,
 349                                 size_t count, loff_t *ppos)
 350 {
 351         struct b43_wldev *dev;
 352         struct b43_debugfs_fops *dfops;
 353         struct b43_dfs_file *dfile;
 354         ssize_t uninitialized_var(ret);
 355         char *buf;
 356         const size_t bufsize = 1024 * 128;
 357         const size_t buforder = get_order(bufsize);
 358         int err = 0;
 359
 360         if (!count)
 361                 return 0;
 362         dev = file->private_data;
 363         if (!dev)
 364                 return -ENODEV;
 365
 366         mutex_lock(&dev->wl->mutex);
 367         if (b43_status(dev) < B43_STAT_INITIALIZED) {
 368                 err = -ENODEV;
 369                 goto out_unlock;
 370         }
 371
 372         dfops = container_of(file->f_op, struct b43_debugfs_fops, fops);
 373         if (!dfops->read) {
 374                 err = -ENOSYS;
 375                 goto out_unlock;
 376         }
 377         dfile = fops_to_dfs_file(dev, dfops);
 378
 379         if (!dfile->buffer) {
 380                 buf = (char *)__get_free_pages(GFP_KERNEL, buforder);
 381                 if (!buf) {
 382                         err = -ENOMEM;
 383                         goto out_unlock;
 384                 }
 385                 /* Sparse warns about the following memset, because it has a big
 386                  * size value. That warning is bogus, so I will ignore it. --mb */
 387                 memset(buf, 0, bufsize);
 388                 if (dfops->take_irqlock) {
 389                         spin_lock_irq(&dev->wl->irq_lock);
 390                         ret = dfops->read(dev, buf, bufsize);
 391                         spin_unlock_irq(&dev->wl->irq_lock);
 392                 } else
 393                         ret = dfops->read(dev, buf, bufsize);
 394                 if (ret <= 0) {
 395                         free_pages((unsigned long)buf, buforder);
 396                         err = ret;
 397                         goto out_unlock;
 398                 }
 399                 dfile->data_len = ret;
 400                 dfile->buffer = buf;
 401         }
 402
 403         ret = simple_read_from_buffer(userbuf, count, ppos,
 404                                       dfile->buffer,
 405                                       dfile->data_len);
 406         if (*ppos >= dfile->data_len) {
 407                 free_pages((unsigned long)dfile->buffer, buforder);
 408                 dfile->buffer = NULL;
 409                 dfile->data_len = 0;
 410         }
 411 out_unlock:
 412         mutex_unlock(&dev->wl->mutex);
 413
 414         return err ? err : ret;
 415 }
 416
 417 static ssize_t b43_debugfs_write(struct file *file,
 418                                  const char __user *userbuf,
 419                                  size_t count, loff_t *ppos)
 420 {
 421         struct b43_wldev *dev;
 422         struct b43_debugfs_fops *dfops;
 423         char *buf;
 424         int err = 0;
 425
 426         if (!count)
 427                 return 0;
 428         if (count > PAGE_SIZE)
 429                 return -E2BIG;
 430         dev = file->private_data;
 431         if (!dev)
 432                 return -ENODEV;
 433
 434         mutex_lock(&dev->wl->mutex);
 435         if (b43_status(dev) < B43_STAT_INITIALIZED) {
 436                 err = -ENODEV;
 437                 goto out_unlock;
 438         }
 439
 440         dfops = container_of(file->f_op, struct b43_debugfs_fops, fops);
 441         if (!dfops->write) {
 442                 err = -ENOSYS;
 443                 goto out_unlock;
 444         }
 445
 446         buf = (char *)get_zeroed_page(GFP_KERNEL);
 447         if (!buf) {
 448                 err = -ENOMEM;
 449                 goto out_unlock;
 450         }
 451         if (copy_from_user(buf, userbuf, count)) {
 452                 err = -EFAULT;
 453                 goto out_freepage;
 454         }
 455         if (dfops->take_irqlock) {
 456                 spin_lock_irq(&dev->wl->irq_lock);
 457                 err = dfops->write(dev, buf, count);
 458                 spin_unlock_irq(&dev->wl->irq_lock);
 459         } else
 460                 err = dfops->write(dev, buf, count);
 461         if (err)
 462                 goto out_freepage;
 463
 464 out_freepage:
 465         free_page((unsigned long)buf);
 466 out_unlock:
 467         mutex_unlock(&dev->wl->mutex);
 468
 469         return err ? err : count;
 470 }
 471
 472
 473 #define B43_DEBUGFS_FOPS(name, _read, _write, _take_irqlock)    \
 474         static struct b43_debugfs_fops fops_##name = {          \
 475                 .read   = _read,                                \
 476                 .write  = _write,                               \
 477                 .fops   = {                                     \
 478                         .open   = b43_debugfs_open,             \
 479                         .read   = b43_debugfs_read,             \
 480                         .write  = b43_debugfs_write,            \
 481                 },                                              \
 482                 .file_struct_offset = offsetof(struct b43_dfsentry, \
 483                                                file_##name),    \
 484                 .take_irqlock   = _take_irqlock,                \
 485         }
 486
 487 B43_DEBUGFS_FOPS(tsf, tsf_read_file, tsf_write_file, 1);
 488 B43_DEBUGFS_FOPS(ucode_regs, ucode_regs_read_file, NULL, 1);
 489 B43_DEBUGFS_FOPS(shm, shm_read_file, NULL, 1);
 490 B43_DEBUGFS_FOPS(txstat, txstat_read_file, NULL, 0);
 491 B43_DEBUGFS_FOPS(txpower_g, txpower_g_read_file, txpower_g_write_file, 0);
 492 B43_DEBUGFS_FOPS(restart, NULL, restart_write_file, 1);
 493 B43_DEBUGFS_FOPS(loctls, loctls_read_file, NULL, 0);
 494
 495
 496 int b43_debug(struct b43_wldev *dev, enum b43_dyndbg feature)
 497 {
 498         return !!(dev->dfsentry && dev->dfsentry->dyn_debug[feature]);
 499 }
 500
 501 static void b43_remove_dynamic_debug(struct b43_wldev *dev)
 502 {
 503         struct b43_dfsentry *e = dev->dfsentry;
 504         int i;
 505
 506         for (i = 0; i < __B43_NR_DYNDBG; i++)
 507                 debugfs_remove(e->dyn_debug_dentries[i]);
 508 }
 509
 510 static void b43_add_dynamic_debug(struct b43_wldev *dev)
 511 {
 512         struct b43_dfsentry *e = dev->dfsentry;
 513         struct dentry *d;
 514
 515 #define add_dyn_dbg(name, id, initstate) do {           \
 516         e->dyn_debug[id] = (initstate);                 \
 517         d = debugfs_create_bool(name, 0600, e->subdir,  \
 518                                 &(e->dyn_debug[id]));   \
 519         if (!IS_ERR(d))                                 \
 520                 e->dyn_debug_dentries[id] = d;          \
 521                                 } while (0)
 522
 523         add_dyn_dbg("debug_xmitpower", B43_DBG_XMITPOWER, 0);
 524         add_dyn_dbg("debug_dmaoverflow", B43_DBG_DMAOVERFLOW, 0);
 525         add_dyn_dbg("debug_dmaverbose", B43_DBG_DMAVERBOSE, 0);
 526         add_dyn_dbg("debug_pwork_fast", B43_DBG_PWORK_FAST, 0);
 527         add_dyn_dbg("debug_pwork_stop", B43_DBG_PWORK_STOP, 0);
 528
 529 #undef add_dyn_dbg
 530 }
 531
 532 void b43_debugfs_add_device(struct b43_wldev *dev)
 533 {
 534         struct b43_dfsentry *e;
 535         struct b43_txstatus_log *log;
 536         char devdir[16];
 537
 538         B43_WARN_ON(!dev);
 539         e = kzalloc(sizeof(*e), GFP_KERNEL);
 540         if (!e) {
 541                 b43err(dev->wl, "debugfs: add device OOM\n");
 542                 return;
 543         }
 544         e->dev = dev;
 545         log = &e->txstatlog;
 546         log->log = kcalloc(B43_NR_LOGGED_TXSTATUS,
 547                            sizeof(struct b43_txstatus), GFP_KERNEL);
 548         if (!log->log) {
 549                 b43err(dev->wl, "debugfs: add device txstatus OOM\n");
 550                 kfree(e);
 551                 return;
 552         }
 553         log->end = -1;
 554         spin_lock_init(&log->lock);
 555
 556         dev->dfsentry = e;
 557
 558         snprintf(devdir, sizeof(devdir), "%s", wiphy_name(dev->wl->hw->wiphy));
 559         e->subdir = debugfs_create_dir(devdir, rootdir);
 560         if (!e->subdir || IS_ERR(e->subdir)) {
 561                 if (e->subdir == ERR_PTR(-ENODEV)) {
 562                         b43dbg(dev->wl, "DebugFS (CONFIG_DEBUG_FS) not "
 563                                "enabled in kernel config\n");
 564                 } else {
 565                         b43err(dev->wl, "debugfs: cannot create %s directory\n",
 566                                devdir);
 567                 }
 568                 dev->dfsentry = NULL;
 569                 kfree(log->log);
 570                 kfree(e);
 571                 return;
 572         }
 573
 574 #define ADD_FILE(name, mode)    \
 575         do {                                                    \
 576                 struct dentry *d;                               \
 577                 d = debugfs_create_file(__stringify(name),      \
 578                                         mode, e->subdir, dev,   \
 579                                         &fops_##name.fops);     \
 580                 e->file_##name.dentry = NULL;                   \
 581                 if (!IS_ERR(d))                                 \
 582                         e->file_##name.dentry = d;              \
 583         } while (0)
 584
 585
 586         ADD_FILE(tsf, 0600);
 587         ADD_FILE(ucode_regs, 0400);
 588         ADD_FILE(shm, 0400);
 589         ADD_FILE(txstat, 0400);
 590         ADD_FILE(txpower_g, 0600);
 591         ADD_FILE(restart, 0200);
 592         ADD_FILE(loctls, 0400);
 593
 594 #undef ADD_FILE
 595
 596         b43_add_dynamic_debug(dev);
 597 }
 598
 599 void b43_debugfs_remove_device(struct b43_wldev *dev)
 600 {
 601         struct b43_dfsentry *e;
 602
 603         if (!dev)
 604                 return;
 605         e = dev->dfsentry;
 606         if (!e)
 607                 return;
 608         b43_remove_dynamic_debug(dev);
 609
 610         debugfs_remove(e->file_tsf.dentry);
 611         debugfs_remove(e->file_ucode_regs.dentry);
 612         debugfs_remove(e->file_shm.dentry);
 613         debugfs_remove(e->file_txstat.dentry);
 614         debugfs_remove(e->file_txpower_g.dentry);
 615         debugfs_remove(e->file_restart.dentry);
 616         debugfs_remove(e->file_loctls.dentry);
 617
 618         debugfs_remove(e->subdir);
 619         kfree(e->txstatlog.log);
 620         kfree(e);
 621 }
 622
 623 void b43_debugfs_log_txstat(struct b43_wldev *dev,
 624                             const struct b43_txstatus *status)
 625 {
 626         struct b43_dfsentry *e = dev->dfsentry;
 627         struct b43_txstatus_log *log;
 628         struct b43_txstatus *cur;
 629         int i;
 630
 631         if (!e)
 632                 return;
 633         log = &e->txstatlog;
 634         B43_WARN_ON(!irqs_disabled());
 635         spin_lock(&log->lock);
 636         i = log->end + 1;
 637         if (i == B43_NR_LOGGED_TXSTATUS)
 638                 i = 0;
 639         log->end = i;
 640         cur = &(log->log[i]);
 641         memcpy(cur, status, sizeof(*cur));
 642         spin_unlock(&log->lock);
 643 }
 644
 645 void b43_debugfs_init(void)
 646 {
 647         rootdir = debugfs_create_dir(KBUILD_MODNAME, NULL);
 648         if (IS_ERR(rootdir))
 649                 rootdir = NULL;
 650 }
 651
 652 void b43_debugfs_exit(void)
 653 {
 654         debugfs_remove(rootdir);
 655 }