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         if (dev->phy.type != B43_PHYTYPE_G)
 226                 return -ENODEV;
 227         if ((count >= 4) && (memcmp(buf, "auto", 4) == 0)) {
 228                 /* Automatic control */
 229                 dev->phy.manual_txpower_control = 0;
 230                 b43_phy_xmitpower(dev);
 231         } else {
 232                 int bbatt = 0, rfatt = 0, txmix = 0, pa2db = 0, pa3db = 0;
 233                 /* Manual control */
 234                 if (sscanf(buf, "%d %d %d %d %d", &bbatt, &rfatt,
 235                            &txmix, &pa2db, &pa3db) != 5)
 236                         return -EINVAL;
 237                 b43_put_attenuation_into_ranges(dev, &bbatt, &rfatt);
 238                 dev->phy.manual_txpower_control = 1;
 239                 dev->phy.bbatt.att = bbatt;
 240                 dev->phy.rfatt.att = rfatt;
 241                 dev->phy.tx_control = 0;
 242                 if (txmix)
 243                         dev->phy.tx_control |= B43_TXCTL_TXMIX;
 244                 if (pa2db)
 245                         dev->phy.tx_control |= B43_TXCTL_PA2DB;
 246                 if (pa3db)
 247                         dev->phy.tx_control |= B43_TXCTL_PA3DB;
 248                 b43_phy_lock(dev);
 249                 b43_radio_lock(dev);
 250                 b43_set_txpower_g(dev, &dev->phy.bbatt,
 251                                   &dev->phy.rfatt, dev->phy.tx_control);
 252                 b43_radio_unlock(dev);
 253                 b43_phy_unlock(dev);
 254         }
 255
 256         return 0;
 257 }
 258
 259 /* wl->irq_lock is locked */
 260 static int restart_write_file(struct b43_wldev *dev,
 261                               const char *buf, size_t count)
 262 {
 263         int err = 0;
 264
 265         if (count > 0 && buf[0] == '1') {
 266                 b43_controller_restart(dev, "manually restarted");
 267         } else
 268                 err = -EINVAL;
 269
 270         return err;
 271 }
 272
 273 static ssize_t append_lo_table(ssize_t count, char *buf, const size_t bufsize,
 274                                struct b43_loctl table[B43_NR_BB][B43_NR_RF])
 275 {
 276         unsigned int i, j;
 277         struct b43_loctl *ctl;
 278
 279         for (i = 0; i < B43_NR_BB; i++) {
 280                 for (j = 0; j < B43_NR_RF; j++) {
 281                         ctl = &(table[i][j]);
 282                         fappend("(bbatt %2u, rfatt %2u)  ->  "
 283                                 "(I %+3d, Q %+3d, Used: %d, Calibrated: %d)\n",
 284                                 i, j, ctl->i, ctl->q,
 285                                 ctl->used,
 286                                 b43_loctl_is_calibrated(ctl));
 287                 }
 288         }
 289
 290         return count;
 291 }
 292
 293 static ssize_t loctls_read_file(struct b43_wldev *dev,
 294                                 char *buf, size_t bufsize)
 295 {
 296         ssize_t count = 0;
 297         struct b43_txpower_lo_control *lo;
 298         int i, err = 0;
 299
 300         if (dev->phy.type != B43_PHYTYPE_G) {
 301                 fappend("Device is not a G-PHY\n");
 302                 err = -ENODEV;
 303                 goto out;
 304         }
 305         lo = dev->phy.lo_control;
 306         fappend("-- Local Oscillator calibration data --\n\n");
 307         fappend("Measured: %d,  Rebuild: %d,  HW-power-control: %d\n",
 308                 lo->lo_measured,
 309                 lo->rebuild,
 310                 dev->phy.hardware_power_control);
 311         fappend("TX Bias: 0x%02X,  TX Magn: 0x%02X\n",
 312                 lo->tx_bias, lo->tx_magn);
 313         fappend("Power Vector: 0x%08X%08X\n",
 314                 (unsigned int)((lo->power_vector & 0xFFFFFFFF00000000ULL) >> 32),
 315                 (unsigned int)(lo->power_vector & 0x00000000FFFFFFFFULL));
 316         fappend("\nControl table WITH PADMIX:\n");
 317         count = append_lo_table(count, buf, bufsize, lo->with_padmix);
 318         fappend("\nControl table WITHOUT PADMIX:\n");
 319         count = append_lo_table(count, buf, bufsize, lo->no_padmix);
 320         fappend("\nUsed RF attenuation values:  Value(WithPadmix flag)\n");
 321         for (i = 0; i < lo->rfatt_list.len; i++) {
 322                 fappend("%u(%d), ",
 323                         lo->rfatt_list.list[i].att,
 324                         lo->rfatt_list.list[i].with_padmix);
 325         }
 326         fappend("\n");
 327         fappend("\nUsed Baseband attenuation values:\n");
 328         for (i = 0; i < lo->bbatt_list.len; i++) {
 329                 fappend("%u, ",
 330                         lo->bbatt_list.list[i].att);
 331         }
 332         fappend("\n");
 333
 334 out:
 335         return err ? err : count;
 336 }
 337
 338 #undef fappend
 339
 340 static int b43_debugfs_open(struct inode *inode, struct file *file)
 341 {
 342         file->private_data = inode->i_private;
 343         return 0;
 344 }
 345
 346 static ssize_t b43_debugfs_read(struct file *file, char __user *userbuf,
 347                                 size_t count, loff_t *ppos)
 348 {
 349         struct b43_wldev *dev;
 350         struct b43_debugfs_fops *dfops;
 351         struct b43_dfs_file *dfile;
 352         ssize_t uninitialized_var(ret);
 353         char *buf;
 354         const size_t bufsize = 1024 * 128;
 355         const size_t buforder = get_order(bufsize);
 356         int err = 0;
 357
 358         if (!count)
 359                 return 0;
 360         dev = file->private_data;
 361         if (!dev)
 362                 return -ENODEV;
 363
 364         mutex_lock(&dev->wl->mutex);
 365         if (b43_status(dev) < B43_STAT_INITIALIZED) {
 366                 err = -ENODEV;
 367                 goto out_unlock;
 368         }
 369
 370         dfops = container_of(file->f_op, struct b43_debugfs_fops, fops);
 371         if (!dfops->read) {
 372                 err = -ENOSYS;
 373                 goto out_unlock;
 374         }
 375         dfile = fops_to_dfs_file(dev, dfops);
 376
 377         if (!dfile->buffer) {
 378                 buf = (char *)__get_free_pages(GFP_KERNEL, buforder);
 379                 if (!buf) {
 380                         err = -ENOMEM;
 381                         goto out_unlock;
 382                 }
 383                 /* Sparse warns about the following memset, because it has a big
 384                  * size value. That warning is bogus, so I will ignore it. --mb */
 385                 memset(buf, 0, bufsize);
 386                 if (dfops->take_irqlock) {
 387                         spin_lock_irq(&dev->wl->irq_lock);
 388                         ret = dfops->read(dev, buf, bufsize);
 389                         spin_unlock_irq(&dev->wl->irq_lock);
 390                 } else
 391                         ret = dfops->read(dev, buf, bufsize);
 392                 if (ret <= 0) {
 393                         free_pages((unsigned long)buf, buforder);
 394                         err = ret;
 395                         goto out_unlock;
 396                 }
 397                 dfile->data_len = ret;
 398                 dfile->buffer = buf;
 399         }
 400
 401         ret = simple_read_from_buffer(userbuf, count, ppos,
 402                                       dfile->buffer,
 403                                       dfile->data_len);
 404         if (*ppos >= dfile->data_len) {
 405                 free_pages((unsigned long)dfile->buffer, buforder);
 406                 dfile->buffer = NULL;
 407                 dfile->data_len = 0;
 408         }
 409 out_unlock:
 410         mutex_unlock(&dev->wl->mutex);
 411
 412         return err ? err : ret;
 413 }
 414
 415 static ssize_t b43_debugfs_write(struct file *file,
 416                                  const char __user *userbuf,
 417                                  size_t count, loff_t *ppos)
 418 {
 419         struct b43_wldev *dev;
 420         struct b43_debugfs_fops *dfops;
 421         char *buf;
 422         int err = 0;
 423
 424         if (!count)
 425                 return 0;
 426         if (count > PAGE_SIZE)
 427                 return -E2BIG;
 428         dev = file->private_data;
 429         if (!dev)
 430                 return -ENODEV;
 431
 432         mutex_lock(&dev->wl->mutex);
 433         if (b43_status(dev) < B43_STAT_INITIALIZED) {
 434                 err = -ENODEV;
 435                 goto out_unlock;
 436         }
 437
 438         dfops = container_of(file->f_op, struct b43_debugfs_fops, fops);
 439         if (!dfops->write) {
 440                 err = -ENOSYS;
 441                 goto out_unlock;
 442         }
 443
 444         buf = (char *)get_zeroed_page(GFP_KERNEL);
 445         if (!buf) {
 446                 err = -ENOMEM;
 447                 goto out_unlock;
 448         }
 449         if (copy_from_user(buf, userbuf, count)) {
 450                 err = -EFAULT;
 451                 goto out_freepage;
 452         }
 453         if (dfops->take_irqlock) {
 454                 spin_lock_irq(&dev->wl->irq_lock);
 455                 err = dfops->write(dev, buf, count);
 456                 spin_unlock_irq(&dev->wl->irq_lock);
 457         } else
 458                 err = dfops->write(dev, buf, count);
 459         if (err)
 460                 goto out_freepage;
 461
 462 out_freepage:
 463         free_page((unsigned long)buf);
 464 out_unlock:
 465         mutex_unlock(&dev->wl->mutex);
 466
 467         return err ? err : count;
 468 }
 469
 470
 471 #define B43_DEBUGFS_FOPS(name, _read, _write, _take_irqlock)    \
 472         static struct b43_debugfs_fops fops_##name = {          \
 473                 .read   = _read,                                \
 474                 .write  = _write,                               \
 475                 .fops   = {                                     \
 476                         .open   = b43_debugfs_open,             \
 477                         .read   = b43_debugfs_read,             \
 478                         .write  = b43_debugfs_write,            \
 479                 },                                              \
 480                 .file_struct_offset = offsetof(struct b43_dfsentry, \
 481                                                file_##name),    \
 482                 .take_irqlock   = _take_irqlock,                \
 483         }
 484
 485 B43_DEBUGFS_FOPS(tsf, tsf_read_file, tsf_write_file, 1);
 486 B43_DEBUGFS_FOPS(ucode_regs, ucode_regs_read_file, NULL, 1);
 487 B43_DEBUGFS_FOPS(shm, shm_read_file, NULL, 1);
 488 B43_DEBUGFS_FOPS(txstat, txstat_read_file, NULL, 0);
 489 B43_DEBUGFS_FOPS(txpower_g, txpower_g_read_file, txpower_g_write_file, 0);
 490 B43_DEBUGFS_FOPS(restart, NULL, restart_write_file, 1);
 491 B43_DEBUGFS_FOPS(loctls, loctls_read_file, NULL, 0);
 492
 493
 494 int b43_debug(struct b43_wldev *dev, enum b43_dyndbg feature)
 495 {
 496         return !!(dev->dfsentry && dev->dfsentry->dyn_debug[feature]);
 497 }
 498
 499 static void b43_remove_dynamic_debug(struct b43_wldev *dev)
 500 {
 501         struct b43_dfsentry *e = dev->dfsentry;
 502         int i;
 503
 504         for (i = 0; i < __B43_NR_DYNDBG; i++)
 505                 debugfs_remove(e->dyn_debug_dentries[i]);
 506 }
 507
 508 static void b43_add_dynamic_debug(struct b43_wldev *dev)
 509 {
 510         struct b43_dfsentry *e = dev->dfsentry;
 511         struct dentry *d;
 512
 513 #define add_dyn_dbg(name, id, initstate) do {           \
 514         e->dyn_debug[id] = (initstate);                 \
 515         d = debugfs_create_bool(name, 0600, e->subdir,  \
 516                                 &(e->dyn_debug[id]));   \
 517         if (!IS_ERR(d))                                 \
 518                 e->dyn_debug_dentries[id] = d;          \
 519                                 } while (0)
 520
 521         add_dyn_dbg("debug_xmitpower", B43_DBG_XMITPOWER, 0);
 522         add_dyn_dbg("debug_dmaoverflow", B43_DBG_DMAOVERFLOW, 0);
 523         add_dyn_dbg("debug_dmaverbose", B43_DBG_DMAVERBOSE, 0);
 524         add_dyn_dbg("debug_pwork_fast", B43_DBG_PWORK_FAST, 0);
 525         add_dyn_dbg("debug_pwork_stop", B43_DBG_PWORK_STOP, 0);
 526
 527 #undef add_dyn_dbg
 528 }
 529
 530 void b43_debugfs_add_device(struct b43_wldev *dev)
 531 {
 532         struct b43_dfsentry *e;
 533         struct b43_txstatus_log *log;
 534         char devdir[16];
 535
 536         B43_WARN_ON(!dev);
 537         e = kzalloc(sizeof(*e), GFP_KERNEL);
 538         if (!e) {
 539                 b43err(dev->wl, "debugfs: add device OOM\n");
 540                 return;
 541         }
 542         e->dev = dev;
 543         log = &e->txstatlog;
 544         log->log = kcalloc(B43_NR_LOGGED_TXSTATUS,
 545                            sizeof(struct b43_txstatus), GFP_KERNEL);
 546         if (!log->log) {
 547                 b43err(dev->wl, "debugfs: add device txstatus OOM\n");
 548                 kfree(e);
 549                 return;
 550         }
 551         log->end = -1;
 552         spin_lock_init(&log->lock);
 553
 554         dev->dfsentry = e;
 555
 556         snprintf(devdir, sizeof(devdir), "%s", wiphy_name(dev->wl->hw->wiphy));
 557         e->subdir = debugfs_create_dir(devdir, rootdir);
 558         if (!e->subdir || IS_ERR(e->subdir)) {
 559                 if (e->subdir == ERR_PTR(-ENODEV)) {
 560                         b43dbg(dev->wl, "DebugFS (CONFIG_DEBUG_FS) not "
 561                                "enabled in kernel config\n");
 562                 } else {
 563                         b43err(dev->wl, "debugfs: cannot create %s directory\n",
 564                                devdir);
 565                 }
 566                 dev->dfsentry = NULL;
 567                 kfree(log->log);
 568                 kfree(e);
 569                 return;
 570         }
 571
 572 #define ADD_FILE(name, mode)    \
 573         do {                                                    \
 574                 struct dentry *d;                               \
 575                 d = debugfs_create_file(__stringify(name),      \
 576                                         mode, e->subdir, dev,   \
 577                                         &fops_##name.fops);     \
 578                 e->file_##name.dentry = NULL;                   \
 579                 if (!IS_ERR(d))                                 \
 580                         e->file_##name.dentry = d;              \
 581         } while (0)
 582
 583
 584         ADD_FILE(tsf, 0600);
 585         ADD_FILE(ucode_regs, 0400);
 586         ADD_FILE(shm, 0400);
 587         ADD_FILE(txstat, 0400);
 588         ADD_FILE(txpower_g, 0600);
 589         ADD_FILE(restart, 0200);
 590         ADD_FILE(loctls, 0400);
 591
 592 #undef ADD_FILE
 593
 594         b43_add_dynamic_debug(dev);
 595 }
 596
 597 void b43_debugfs_remove_device(struct b43_wldev *dev)
 598 {
 599         struct b43_dfsentry *e;
 600
 601         if (!dev)
 602                 return;
 603         e = dev->dfsentry;
 604         if (!e)
 605                 return;
 606         b43_remove_dynamic_debug(dev);
 607
 608         debugfs_remove(e->file_tsf.dentry);
 609         debugfs_remove(e->file_ucode_regs.dentry);
 610         debugfs_remove(e->file_shm.dentry);
 611         debugfs_remove(e->file_txstat.dentry);
 612         debugfs_remove(e->file_txpower_g.dentry);
 613         debugfs_remove(e->file_restart.dentry);
 614         debugfs_remove(e->file_loctls.dentry);
 615
 616         debugfs_remove(e->subdir);
 617         kfree(e->txstatlog.log);
 618         kfree(e);
 619 }
 620
 621 /* Called with IRQs disabled. */
 622 void b43_debugfs_log_txstat(struct b43_wldev *dev,
 623                             const struct b43_txstatus *status)
 624 {
 625         struct b43_dfsentry *e = dev->dfsentry;
 626         struct b43_txstatus_log *log;
 627         struct b43_txstatus *cur;
 628         int i;
 629
 630         if (!e)
 631                 return;
 632         log = &e->txstatlog;
 633         spin_lock(&log->lock); /* IRQs are already disabled. */
 634         i = log->end + 1;
 635         if (i == B43_NR_LOGGED_TXSTATUS)
 636                 i = 0;
 637         log->end = i;
 638         cur = &(log->log[i]);
 639         memcpy(cur, status, sizeof(*cur));
 640         spin_unlock(&log->lock);
 641 }
 642
 643 void b43_debugfs_init(void)
 644 {
 645         rootdir = debugfs_create_dir(KBUILD_MODNAME, NULL);
 646         if (IS_ERR(rootdir))
 647                 rootdir = NULL;
 648 }
 649
 650 void b43_debugfs_exit(void)
 651 {
 652         debugfs_remove(rootdir);
 653 }