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   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 unsigned long calc_expire_secs(unsigned long now,
 274                                       unsigned long time,
 275                                       unsigned long expire)
 276 {
 277         expire = time + expire;
 278
 279         if (time_after(now, expire))
 280                 return 0; /* expired */
 281         if (expire < now) {
 282                 /* jiffies wrapped */
 283                 expire -= MAX_JIFFY_OFFSET;
 284                 now -= MAX_JIFFY_OFFSET;
 285         }
 286         B43_WARN_ON(expire < now);
 287
 288         return (expire - now) / HZ;
 289 }
 290
 291 static ssize_t loctls_read_file(struct b43_wldev *dev,
 292                                 char *buf, size_t bufsize)
 293 {
 294         ssize_t count = 0;
 295         struct b43_txpower_lo_control *lo;
 296         int i, err = 0;
 297         struct b43_lo_calib *cal;
 298         unsigned long now = jiffies;
 299         struct b43_phy *phy = &dev->phy;
 300
 301         if (phy->type != B43_PHYTYPE_G) {
 302                 fappend("Device is not a G-PHY\n");
 303                 err = -ENODEV;
 304                 goto out;
 305         }
 306         lo = phy->lo_control;
 307         fappend("-- Local Oscillator calibration data --\n\n");
 308         fappend("HW-power-control enabled: %d\n",
 309                 dev->phy.hardware_power_control);
 310         fappend("TX Bias: 0x%02X,  TX Magn: 0x%02X  (expire in %lu sec)\n",
 311                 lo->tx_bias, lo->tx_magn,
 312                 calc_expire_secs(now, lo->txctl_measured_time,
 313                                  B43_LO_TXCTL_EXPIRE));
 314         fappend("Power Vector: 0x%08X%08X  (expires in %lu sec)\n",
 315                 (unsigned int)((lo->power_vector & 0xFFFFFFFF00000000ULL) >> 32),
 316                 (unsigned int)(lo->power_vector & 0x00000000FFFFFFFFULL),
 317                 calc_expire_secs(now, lo->pwr_vec_read_time,
 318                                  B43_LO_PWRVEC_EXPIRE));
 319
 320         fappend("\nCalibrated settings:\n");
 321         list_for_each_entry(cal, &lo->calib_list, list) {
 322                 bool active;
 323
 324                 active = (b43_compare_bbatt(&cal->bbatt, &phy->bbatt) &&
 325                           b43_compare_rfatt(&cal->rfatt, &phy->rfatt));
 326                 fappend("BB(%d), RF(%d,%d)  ->  I=%d, Q=%d  "
 327                         "(expires in %lu sec)%s\n",
 328                         cal->bbatt.att,
 329                         cal->rfatt.att, cal->rfatt.with_padmix,
 330                         cal->ctl.i, cal->ctl.q,
 331                         calc_expire_secs(now, cal->calib_time,
 332                                          B43_LO_CALIB_EXPIRE),
 333                         active ? "  ACTIVE" : "");
 334         }
 335
 336         fappend("\nUsed RF attenuation values:  Value(WithPadmix flag)\n");
 337         for (i = 0; i < lo->rfatt_list.len; i++) {
 338                 fappend("%u(%d), ",
 339                         lo->rfatt_list.list[i].att,
 340                         lo->rfatt_list.list[i].with_padmix);
 341         }
 342         fappend("\n");
 343         fappend("\nUsed Baseband attenuation values:\n");
 344         for (i = 0; i < lo->bbatt_list.len; i++) {
 345                 fappend("%u, ",
 346                         lo->bbatt_list.list[i].att);
 347         }
 348         fappend("\n");
 349
 350 out:
 351         return err ? err : count;
 352 }
 353
 354 #undef fappend
 355
 356 static int b43_debugfs_open(struct inode *inode, struct file *file)
 357 {
 358         file->private_data = inode->i_private;
 359         return 0;
 360 }
 361
 362 static ssize_t b43_debugfs_read(struct file *file, char __user *userbuf,
 363                                 size_t count, loff_t *ppos)
 364 {
 365         struct b43_wldev *dev;
 366         struct b43_debugfs_fops *dfops;
 367         struct b43_dfs_file *dfile;
 368         ssize_t uninitialized_var(ret);
 369         char *buf;
 370         const size_t bufsize = 1024 * 16; /* 16 kiB buffer */
 371         const size_t buforder = get_order(bufsize);
 372         int err = 0;
 373
 374         if (!count)
 375                 return 0;
 376         dev = file->private_data;
 377         if (!dev)
 378                 return -ENODEV;
 379
 380         mutex_lock(&dev->wl->mutex);
 381         if (b43_status(dev) < B43_STAT_INITIALIZED) {
 382                 err = -ENODEV;
 383                 goto out_unlock;
 384         }
 385
 386         dfops = container_of(file->f_op, struct b43_debugfs_fops, fops);
 387         if (!dfops->read) {
 388                 err = -ENOSYS;
 389                 goto out_unlock;
 390         }
 391         dfile = fops_to_dfs_file(dev, dfops);
 392
 393         if (!dfile->buffer) {
 394                 buf = (char *)__get_free_pages(GFP_KERNEL, buforder);
 395                 if (!buf) {
 396                         err = -ENOMEM;
 397                         goto out_unlock;
 398                 }
 399                 memset(buf, 0, bufsize);
 400                 if (dfops->take_irqlock) {
 401                         spin_lock_irq(&dev->wl->irq_lock);
 402                         ret = dfops->read(dev, buf, bufsize);
 403                         spin_unlock_irq(&dev->wl->irq_lock);
 404                 } else
 405                         ret = dfops->read(dev, buf, bufsize);
 406                 if (ret <= 0) {
 407                         free_pages((unsigned long)buf, buforder);
 408                         err = ret;
 409                         goto out_unlock;
 410                 }
 411                 dfile->data_len = ret;
 412                 dfile->buffer = buf;
 413         }
 414
 415         ret = simple_read_from_buffer(userbuf, count, ppos,
 416                                       dfile->buffer,
 417                                       dfile->data_len);
 418         if (*ppos >= dfile->data_len) {
 419                 free_pages((unsigned long)dfile->buffer, buforder);
 420                 dfile->buffer = NULL;
 421                 dfile->data_len = 0;
 422         }
 423 out_unlock:
 424         mutex_unlock(&dev->wl->mutex);
 425
 426         return err ? err : ret;
 427 }
 428
 429 static ssize_t b43_debugfs_write(struct file *file,
 430                                  const char __user *userbuf,
 431                                  size_t count, loff_t *ppos)
 432 {
 433         struct b43_wldev *dev;
 434         struct b43_debugfs_fops *dfops;
 435         char *buf;
 436         int err = 0;
 437
 438         if (!count)
 439                 return 0;
 440         if (count > PAGE_SIZE)
 441                 return -E2BIG;
 442         dev = file->private_data;
 443         if (!dev)
 444                 return -ENODEV;
 445
 446         mutex_lock(&dev->wl->mutex);
 447         if (b43_status(dev) < B43_STAT_INITIALIZED) {
 448                 err = -ENODEV;
 449                 goto out_unlock;
 450         }
 451
 452         dfops = container_of(file->f_op, struct b43_debugfs_fops, fops);
 453         if (!dfops->write) {
 454                 err = -ENOSYS;
 455                 goto out_unlock;
 456         }
 457
 458         buf = (char *)get_zeroed_page(GFP_KERNEL);
 459         if (!buf) {
 460                 err = -ENOMEM;
 461                 goto out_unlock;
 462         }
 463         if (copy_from_user(buf, userbuf, count)) {
 464                 err = -EFAULT;
 465                 goto out_freepage;
 466         }
 467         if (dfops->take_irqlock) {
 468                 spin_lock_irq(&dev->wl->irq_lock);
 469                 err = dfops->write(dev, buf, count);
 470                 spin_unlock_irq(&dev->wl->irq_lock);
 471         } else
 472                 err = dfops->write(dev, buf, count);
 473         if (err)
 474                 goto out_freepage;
 475
 476 out_freepage:
 477         free_page((unsigned long)buf);
 478 out_unlock:
 479         mutex_unlock(&dev->wl->mutex);
 480
 481         return err ? err : count;
 482 }
 483
 484
 485 #define B43_DEBUGFS_FOPS(name, _read, _write, _take_irqlock)    \
 486         static struct b43_debugfs_fops fops_##name = {          \
 487                 .read   = _read,                                \
 488                 .write  = _write,                               \
 489                 .fops   = {                                     \
 490                         .open   = b43_debugfs_open,             \
 491                         .read   = b43_debugfs_read,             \
 492                         .write  = b43_debugfs_write,            \
 493                 },                                              \
 494                 .file_struct_offset = offsetof(struct b43_dfsentry, \
 495                                                file_##name),    \
 496                 .take_irqlock   = _take_irqlock,                \
 497         }
 498
 499 B43_DEBUGFS_FOPS(tsf, tsf_read_file, tsf_write_file, 1);
 500 B43_DEBUGFS_FOPS(ucode_regs, ucode_regs_read_file, NULL, 1);
 501 B43_DEBUGFS_FOPS(shm, shm_read_file, NULL, 1);
 502 B43_DEBUGFS_FOPS(txstat, txstat_read_file, NULL, 0);
 503 B43_DEBUGFS_FOPS(txpower_g, txpower_g_read_file, txpower_g_write_file, 0);
 504 B43_DEBUGFS_FOPS(restart, NULL, restart_write_file, 1);
 505 B43_DEBUGFS_FOPS(loctls, loctls_read_file, NULL, 0);
 506
 507
 508 int b43_debug(struct b43_wldev *dev, enum b43_dyndbg feature)
 509 {
 510         return !!(dev->dfsentry && dev->dfsentry->dyn_debug[feature]);
 511 }
 512
 513 static void b43_remove_dynamic_debug(struct b43_wldev *dev)
 514 {
 515         struct b43_dfsentry *e = dev->dfsentry;
 516         int i;
 517
 518         for (i = 0; i < __B43_NR_DYNDBG; i++)
 519                 debugfs_remove(e->dyn_debug_dentries[i]);
 520 }
 521
 522 static void b43_add_dynamic_debug(struct b43_wldev *dev)
 523 {
 524         struct b43_dfsentry *e = dev->dfsentry;
 525         struct dentry *d;
 526
 527 #define add_dyn_dbg(name, id, initstate) do {           \
 528         e->dyn_debug[id] = (initstate);                 \
 529         d = debugfs_create_bool(name, 0600, e->subdir,  \
 530                                 &(e->dyn_debug[id]));   \
 531         if (!IS_ERR(d))                                 \
 532                 e->dyn_debug_dentries[id] = d;          \
 533                                 } while (0)
 534
 535         add_dyn_dbg("debug_xmitpower", B43_DBG_XMITPOWER, 0);
 536         add_dyn_dbg("debug_dmaoverflow", B43_DBG_DMAOVERFLOW, 0);
 537         add_dyn_dbg("debug_dmaverbose", B43_DBG_DMAVERBOSE, 0);
 538         add_dyn_dbg("debug_pwork_fast", B43_DBG_PWORK_FAST, 0);
 539         add_dyn_dbg("debug_pwork_stop", B43_DBG_PWORK_STOP, 0);
 540         add_dyn_dbg("debug_lo", B43_DBG_LO, 0);
 541
 542 #undef add_dyn_dbg
 543 }
 544
 545 void b43_debugfs_add_device(struct b43_wldev *dev)
 546 {
 547         struct b43_dfsentry *e;
 548         struct b43_txstatus_log *log;
 549         char devdir[16];
 550
 551         B43_WARN_ON(!dev);
 552         e = kzalloc(sizeof(*e), GFP_KERNEL);
 553         if (!e) {
 554                 b43err(dev->wl, "debugfs: add device OOM\n");
 555                 return;
 556         }
 557         e->dev = dev;
 558         log = &e->txstatlog;
 559         log->log = kcalloc(B43_NR_LOGGED_TXSTATUS,
 560                            sizeof(struct b43_txstatus), GFP_KERNEL);
 561         if (!log->log) {
 562                 b43err(dev->wl, "debugfs: add device txstatus OOM\n");
 563                 kfree(e);
 564                 return;
 565         }
 566         log->end = -1;
 567         spin_lock_init(&log->lock);
 568
 569         dev->dfsentry = e;
 570
 571         snprintf(devdir, sizeof(devdir), "%s", wiphy_name(dev->wl->hw->wiphy));
 572         e->subdir = debugfs_create_dir(devdir, rootdir);
 573         if (!e->subdir || IS_ERR(e->subdir)) {
 574                 if (e->subdir == ERR_PTR(-ENODEV)) {
 575                         b43dbg(dev->wl, "DebugFS (CONFIG_DEBUG_FS) not "
 576                                "enabled in kernel config\n");
 577                 } else {
 578                         b43err(dev->wl, "debugfs: cannot create %s directory\n",
 579                                devdir);
 580                 }
 581                 dev->dfsentry = NULL;
 582                 kfree(log->log);
 583                 kfree(e);
 584                 return;
 585         }
 586
 587 #define ADD_FILE(name, mode)    \
 588         do {                                                    \
 589                 struct dentry *d;                               \
 590                 d = debugfs_create_file(__stringify(name),      \
 591                                         mode, e->subdir, dev,   \
 592                                         &fops_##name.fops);     \
 593                 e->file_##name.dentry = NULL;                   \
 594                 if (!IS_ERR(d))                                 \
 595                         e->file_##name.dentry = d;              \
 596         } while (0)
 597
 598
 599         ADD_FILE(tsf, 0600);
 600         ADD_FILE(ucode_regs, 0400);
 601         ADD_FILE(shm, 0400);
 602         ADD_FILE(txstat, 0400);
 603         ADD_FILE(txpower_g, 0600);
 604         ADD_FILE(restart, 0200);
 605         ADD_FILE(loctls, 0400);
 606
 607 #undef ADD_FILE
 608
 609         b43_add_dynamic_debug(dev);
 610 }
 611
 612 void b43_debugfs_remove_device(struct b43_wldev *dev)
 613 {
 614         struct b43_dfsentry *e;
 615
 616         if (!dev)
 617                 return;
 618         e = dev->dfsentry;
 619         if (!e)
 620                 return;
 621         b43_remove_dynamic_debug(dev);
 622
 623         debugfs_remove(e->file_tsf.dentry);
 624         debugfs_remove(e->file_ucode_regs.dentry);
 625         debugfs_remove(e->file_shm.dentry);
 626         debugfs_remove(e->file_txstat.dentry);
 627         debugfs_remove(e->file_txpower_g.dentry);
 628         debugfs_remove(e->file_restart.dentry);
 629         debugfs_remove(e->file_loctls.dentry);
 630
 631         debugfs_remove(e->subdir);
 632         kfree(e->txstatlog.log);
 633         kfree(e);
 634 }
 635
 636 /* Called with IRQs disabled. */
 637 void b43_debugfs_log_txstat(struct b43_wldev *dev,
 638                             const struct b43_txstatus *status)
 639 {
 640         struct b43_dfsentry *e = dev->dfsentry;
 641         struct b43_txstatus_log *log;
 642         struct b43_txstatus *cur;
 643         int i;
 644
 645         if (!e)
 646                 return;
 647         log = &e->txstatlog;
 648         spin_lock(&log->lock); /* IRQs are already disabled. */
 649         i = log->end + 1;
 650         if (i == B43_NR_LOGGED_TXSTATUS)
 651                 i = 0;
 652         log->end = i;
 653         cur = &(log->log[i]);
 654         memcpy(cur, status, sizeof(*cur));
 655         spin_unlock(&log->lock);
 656 }
 657
 658 void b43_debugfs_init(void)
 659 {
 660         rootdir = debugfs_create_dir(KBUILD_MODNAME, NULL);
 661         if (IS_ERR(rootdir))
 662                 rootdir = NULL;
 663 }
 664
 665 void b43_debugfs_exit(void)
 666 {
 667         debugfs_remove(rootdir);
 668 }