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 "pio.h"
  38 #include "xmit.h"
  39
  40
  41 /* The root directory. */
  42 static struct dentry *rootdir;
  43
  44 struct b43_debugfs_fops {
  45         ssize_t (*read)(struct b43_wldev *dev, char *buf, size_t bufsize);
  46         int (*write)(struct b43_wldev *dev, const char *buf, size_t count);
  47         struct file_operations fops;
  48         /* Offset of struct b43_dfs_file in struct b43_dfsentry */
  49         size_t file_struct_offset;
  50         /* Take wl->irq_lock before calling read/write? */
  51         bool take_irqlock;
  52 };
  53
  54 static inline
  55 struct b43_dfs_file * fops_to_dfs_file(struct b43_wldev *dev,
  56                                        const struct b43_debugfs_fops *dfops)
  57 {
  58         void *p;
  59
  60         p = dev->dfsentry;
  61         p += dfops->file_struct_offset;
  62
  63         return p;
  64 }
  65
  66
  67 #define fappend(fmt, x...)      \
  68         do {                                                    \
  69                 if (bufsize - count)                            \
  70                         count += snprintf(buf + count,          \
  71                                           bufsize - count,      \
  72                                           fmt , ##x);           \
  73                 else                                            \
  74                         printk(KERN_ERR "b43: fappend overflow\n"); \
  75         } while (0)
  76
  77
  78 /* wl->irq_lock is locked */
  79 static ssize_t tsf_read_file(struct b43_wldev *dev,
  80                              char *buf, size_t bufsize)
  81 {
  82         ssize_t count = 0;
  83         u64 tsf;
  84
  85         b43_tsf_read(dev, &tsf);
  86         fappend("0x%08x%08x\n",
  87                 (unsigned int)((tsf & 0xFFFFFFFF00000000ULL) >> 32),
  88                 (unsigned int)(tsf & 0xFFFFFFFFULL));
  89
  90         return count;
  91 }
  92
  93 /* wl->irq_lock is locked */
  94 static int tsf_write_file(struct b43_wldev *dev,
  95                           const char *buf, size_t count)
  96 {
  97         u64 tsf;
  98
  99         if (sscanf(buf, "%llu", (unsigned long long *)(&tsf)) != 1)
 100                 return -EINVAL;
 101         b43_tsf_write(dev, tsf);
 102
 103         return 0;
 104 }
 105
 106 /* wl->irq_lock is locked */
 107 static ssize_t ucode_regs_read_file(struct b43_wldev *dev,
 108                                     char *buf, size_t bufsize)
 109 {
 110         ssize_t count = 0;
 111         int i;
 112
 113         for (i = 0; i < 64; i++) {
 114                 fappend("r%d = 0x%04x\n", i,
 115                         b43_shm_read16(dev, B43_SHM_SCRATCH, i));
 116         }
 117
 118         return count;
 119 }
 120
 121 /* wl->irq_lock is locked */
 122 static ssize_t shm_read_file(struct b43_wldev *dev,
 123                              char *buf, size_t bufsize)
 124 {
 125         ssize_t count = 0;
 126         int i;
 127         u16 tmp;
 128         __le16 *le16buf = (__le16 *)buf;
 129
 130         for (i = 0; i < 0x1000; i++) {
 131                 if (bufsize < sizeof(tmp))
 132                         break;
 133                 tmp = b43_shm_read16(dev, B43_SHM_SHARED, 2 * i);
 134                 le16buf[i] = cpu_to_le16(tmp);
 135                 count += sizeof(tmp);
 136                 bufsize -= sizeof(tmp);
 137         }
 138
 139         return count;
 140 }
 141
 142 static ssize_t txstat_read_file(struct b43_wldev *dev,
 143                                 char *buf, size_t bufsize)
 144 {
 145         struct b43_txstatus_log *log = &dev->dfsentry->txstatlog;
 146         ssize_t count = 0;
 147         unsigned long flags;
 148         int i, idx;
 149         struct b43_txstatus *stat;
 150
 151         spin_lock_irqsave(&log->lock, flags);
 152         if (log->end < 0) {
 153                 fappend("Nothing transmitted, yet\n");
 154                 goto out_unlock;
 155         }
 156         fappend("b43 TX status reports:\n\n"
 157                 "index | cookie | seq | phy_stat | frame_count | "
 158                 "rts_count | supp_reason | pm_indicated | "
 159                 "intermediate | for_ampdu | acked\n" "---\n");
 160         i = log->end + 1;
 161         idx = 0;
 162         while (1) {
 163                 if (i == B43_NR_LOGGED_TXSTATUS)
 164                         i = 0;
 165                 stat = &(log->log[i]);
 166                 if (stat->cookie) {
 167                         fappend("%03d | "
 168                                 "0x%04X | 0x%04X | 0x%02X | "
 169                                 "0x%X | 0x%X | "
 170                                 "%u | %u | "
 171                                 "%u | %u | %u\n",
 172                                 idx,
 173                                 stat->cookie, stat->seq, stat->phy_stat,
 174                                 stat->frame_count, stat->rts_count,
 175                                 stat->supp_reason, stat->pm_indicated,
 176                                 stat->intermediate, stat->for_ampdu,
 177                                 stat->acked);
 178                         idx++;
 179                 }
 180                 if (i == log->end)
 181                         break;
 182                 i++;
 183         }
 184 out_unlock:
 185         spin_unlock_irqrestore(&log->lock, flags);
 186
 187         return count;
 188 }
 189
 190 static ssize_t txpower_g_read_file(struct b43_wldev *dev,
 191                                    char *buf, size_t bufsize)
 192 {
 193         ssize_t count = 0;
 194
 195         if (dev->phy.type != B43_PHYTYPE_G) {
 196                 fappend("Device is not a G-PHY\n");
 197                 goto out;
 198         }
 199         fappend("Control:               %s\n", dev->phy.manual_txpower_control ?
 200                 "MANUAL" : "AUTOMATIC");
 201         fappend("Baseband attenuation:  %u\n", dev->phy.bbatt.att);
 202         fappend("Radio attenuation:     %u\n", dev->phy.rfatt.att);
 203         fappend("TX Mixer Gain:         %s\n",
 204                 (dev->phy.tx_control & B43_TXCTL_TXMIX) ? "ON" : "OFF");
 205         fappend("PA Gain 2dB:           %s\n",
 206                 (dev->phy.tx_control & B43_TXCTL_PA2DB) ? "ON" : "OFF");
 207         fappend("PA Gain 3dB:           %s\n",
 208                 (dev->phy.tx_control & B43_TXCTL_PA3DB) ? "ON" : "OFF");
 209         fappend("\n\n");
 210         fappend("You can write to this file:\n");
 211         fappend("Writing \"auto\" enables automatic txpower control.\n");
 212         fappend
 213             ("Writing the attenuation values as \"bbatt rfatt txmix pa2db pa3db\" "
 214              "enables manual txpower control.\n");
 215         fappend("Example: 5 4 0 0 1\n");
 216         fappend("Enables manual control with Baseband attenuation 5, "
 217                 "Radio attenuation 4, No TX Mixer Gain, "
 218                 "No PA Gain 2dB, With PA Gain 3dB.\n");
 219 out:
 220         return count;
 221 }
 222
 223 static int txpower_g_write_file(struct b43_wldev *dev,
 224                                 const char *buf, size_t count)
 225 {
 226         unsigned long phy_flags;
 227
 228         if (dev->phy.type != B43_PHYTYPE_G)
 229                 return -ENODEV;
 230         if ((count >= 4) && (memcmp(buf, "auto", 4) == 0)) {
 231                 /* Automatic control */
 232                 dev->phy.manual_txpower_control = 0;
 233                 b43_phy_xmitpower(dev);
 234         } else {
 235                 int bbatt = 0, rfatt = 0, txmix = 0, pa2db = 0, pa3db = 0;
 236                 /* Manual control */
 237                 if (sscanf(buf, "%d %d %d %d %d", &bbatt, &rfatt,
 238                            &txmix, &pa2db, &pa3db) != 5)
 239                         return -EINVAL;
 240                 b43_put_attenuation_into_ranges(dev, &bbatt, &rfatt);
 241                 dev->phy.manual_txpower_control = 1;
 242                 dev->phy.bbatt.att = bbatt;
 243                 dev->phy.rfatt.att = rfatt;
 244                 dev->phy.tx_control = 0;
 245                 if (txmix)
 246                         dev->phy.tx_control |= B43_TXCTL_TXMIX;
 247                 if (pa2db)
 248                         dev->phy.tx_control |= B43_TXCTL_PA2DB;
 249                 if (pa3db)
 250                         dev->phy.tx_control |= B43_TXCTL_PA3DB;
 251                 b43_phy_lock(dev, phy_flags);
 252                 b43_radio_lock(dev);
 253                 b43_set_txpower_g(dev, &dev->phy.bbatt,
 254                                   &dev->phy.rfatt, dev->phy.tx_control);
 255                 b43_radio_unlock(dev);
 256                 b43_phy_unlock(dev, phy_flags);
 257         }
 258
 259         return 0;
 260 }
 261
 262 /* wl->irq_lock is locked */
 263 static int restart_write_file(struct b43_wldev *dev,
 264                               const char *buf, size_t count)
 265 {
 266         int err = 0;
 267
 268         if (count > 0 && buf[0] == '1') {
 269                 b43_controller_restart(dev, "manually restarted");
 270         } else
 271                 err = -EINVAL;
 272
 273         return err;
 274 }
 275
 276 static ssize_t append_lo_table(ssize_t count, char *buf, const size_t bufsize,
 277                                struct b43_loctl table[B43_NR_BB][B43_NR_RF])
 278 {
 279         unsigned int i, j;
 280         struct b43_loctl *ctl;
 281
 282         for (i = 0; i < B43_NR_BB; i++) {
 283                 for (j = 0; j < B43_NR_RF; j++) {
 284                         ctl = &(table[i][j]);
 285                         fappend("(bbatt %2u, rfatt %2u)  ->  "
 286                                 "(I %+3d, Q %+3d, Used: %d, Calibrated: %d)\n",
 287                                 i, j, ctl->i, ctl->q,
 288                                 ctl->used,
 289                                 b43_loctl_is_calibrated(ctl));
 290                 }
 291         }
 292
 293         return count;
 294 }
 295
 296 static ssize_t loctls_read_file(struct b43_wldev *dev,
 297                                 char *buf, size_t bufsize)
 298 {
 299         ssize_t count = 0;
 300         struct b43_txpower_lo_control *lo;
 301         int i, err = 0;
 302
 303         if (dev->phy.type != B43_PHYTYPE_G) {
 304                 fappend("Device is not a G-PHY\n");
 305                 err = -ENODEV;
 306                 goto out;
 307         }
 308         lo = dev->phy.lo_control;
 309         fappend("-- Local Oscillator calibration data --\n\n");
 310         fappend("Measured: %d,  Rebuild: %d,  HW-power-control: %d\n",
 311                 lo->lo_measured,
 312                 lo->rebuild,
 313                 dev->phy.hardware_power_control);
 314         fappend("TX Bias: 0x%02X,  TX Magn: 0x%02X\n",
 315                 lo->tx_bias, lo->tx_magn);
 316         fappend("Power Vector: 0x%08X%08X\n",
 317                 (unsigned int)((lo->power_vector & 0xFFFFFFFF00000000ULL) >> 32),
 318                 (unsigned int)(lo->power_vector & 0x00000000FFFFFFFFULL));
 319         fappend("\nControl table WITH PADMIX:\n");
 320         count = append_lo_table(count, buf, bufsize, lo->with_padmix);
 321         fappend("\nControl table WITHOUT PADMIX:\n");
 322         count = append_lo_table(count, buf, bufsize, lo->no_padmix);
 323         fappend("\nUsed RF attenuation values:  Value(WithPadmix flag)\n");
 324         for (i = 0; i < lo->rfatt_list.len; i++) {
 325                 fappend("%u(%d), ",
 326                         lo->rfatt_list.list[i].att,
 327                         lo->rfatt_list.list[i].with_padmix);
 328         }
 329         fappend("\n");
 330         fappend("\nUsed Baseband attenuation values:\n");
 331         for (i = 0; i < lo->bbatt_list.len; i++) {
 332                 fappend("%u, ",
 333                         lo->bbatt_list.list[i].att);
 334         }
 335         fappend("\n");
 336
 337 out:
 338         return err ? err : count;
 339 }
 340
 341 #undef fappend
 342
 343 static int b43_debugfs_open(struct inode *inode, struct file *file)
 344 {
 345         file->private_data = inode->i_private;
 346         return 0;
 347 }
 348
 349 static ssize_t b43_debugfs_read(struct file *file, char __user *userbuf,
 350                                 size_t count, loff_t *ppos)
 351 {
 352         struct b43_wldev *dev;
 353         struct b43_debugfs_fops *dfops;
 354         struct b43_dfs_file *dfile;
 355         ssize_t ret;
 356         char *buf;
 357         const size_t bufsize = 1024 * 128;
 358         const size_t buforder = get_order(bufsize);
 359         int err = 0;
 360
 361         if (!count)
 362                 return 0;
 363         dev = file->private_data;
 364         if (!dev)
 365                 return -ENODEV;
 366
 367         mutex_lock(&dev->wl->mutex);
 368         if (b43_status(dev) < B43_STAT_INITIALIZED) {
 369                 err = -ENODEV;
 370                 goto out_unlock;
 371         }
 372
 373         dfops = container_of(file->f_op, struct b43_debugfs_fops, fops);
 374         if (!dfops->read) {
 375                 err = -ENOSYS;
 376                 goto out_unlock;
 377         }
 378         dfile = fops_to_dfs_file(dev, dfops);
 379
 380         if (!dfile->buffer) {
 381                 buf = (char *)__get_free_pages(GFP_KERNEL, buforder);
 382                 if (!buf) {
 383                         err = -ENOMEM;
 384                         goto out_unlock;
 385                 }
 386                 /* Sparse warns about the following memset, because it has a big
 387                  * size value. That warning is bogus, so I will ignore it. --mb */
 388                 memset(buf, 0, bufsize);
 389                 if (dfops->take_irqlock) {
 390                         spin_lock_irq(&dev->wl->irq_lock);
 391                         ret = dfops->read(dev, buf, bufsize);
 392                         spin_unlock_irq(&dev->wl->irq_lock);
 393                 } else
 394                         ret = dfops->read(dev, buf, bufsize);
 395                 if (ret <= 0) {
 396                         free_pages((unsigned long)buf, buforder);
 397                         err = ret;
 398                         goto out_unlock;
 399                 }
 400                 dfile->data_len = ret;
 401                 dfile->buffer = buf;
 402         }
 403
 404         ret = simple_read_from_buffer(userbuf, count, ppos,
 405                                       dfile->buffer,
 406                                       dfile->data_len);
 407         if (*ppos >= dfile->data_len) {
 408                 free_pages((unsigned long)dfile->buffer, buforder);
 409                 dfile->buffer = NULL;
 410                 dfile->data_len = 0;
 411         }
 412 out_unlock:
 413         mutex_unlock(&dev->wl->mutex);
 414
 415         return err ? err : ret;
 416 }
 417
 418 static ssize_t b43_debugfs_write(struct file *file,
 419                                  const char __user *userbuf,
 420                                  size_t count, loff_t *ppos)
 421 {
 422         struct b43_wldev *dev;
 423         struct b43_debugfs_fops *dfops;
 424         char *buf;
 425         int err = 0;
 426
 427         if (!count)
 428                 return 0;
 429         if (count > PAGE_SIZE)
 430                 return -E2BIG;
 431         dev = file->private_data;
 432         if (!dev)
 433                 return -ENODEV;
 434
 435         mutex_lock(&dev->wl->mutex);
 436         if (b43_status(dev) < B43_STAT_INITIALIZED) {
 437                 err = -ENODEV;
 438                 goto out_unlock;
 439         }
 440
 441         dfops = container_of(file->f_op, struct b43_debugfs_fops, fops);
 442         if (!dfops->write) {
 443                 err = -ENOSYS;
 444                 goto out_unlock;
 445         }
 446
 447         buf = (char *)get_zeroed_page(GFP_KERNEL);
 448         if (!buf) {
 449                 err = -ENOMEM;
 450                 goto out_unlock;
 451         }
 452         if (copy_from_user(buf, userbuf, count)) {
 453                 err = -EFAULT;
 454                 goto out_freepage;
 455         }
 456         if (dfops->take_irqlock) {
 457                 spin_lock_irq(&dev->wl->irq_lock);
 458                 err = dfops->write(dev, buf, count);
 459                 spin_unlock_irq(&dev->wl->irq_lock);
 460         } else
 461                 err = dfops->write(dev, buf, count);
 462         if (err)
 463                 goto out_freepage;
 464
 465 out_freepage:
 466         free_page((unsigned long)buf);
 467 out_unlock:
 468         mutex_unlock(&dev->wl->mutex);
 469
 470         return err ? err : count;
 471 }
 472
 473
 474 #define B43_DEBUGFS_FOPS(name, _read, _write, _take_irqlock)    \
 475         static struct b43_debugfs_fops fops_##name = {          \
 476                 .read   = _read,                                \
 477                 .write  = _write,                               \
 478                 .fops   = {                                     \
 479                         .open   = b43_debugfs_open,             \
 480                         .read   = b43_debugfs_read,             \
 481                         .write  = b43_debugfs_write,            \
 482                 },                                              \
 483                 .file_struct_offset = offsetof(struct b43_dfsentry, \
 484                                                file_##name),    \
 485                 .take_irqlock   = _take_irqlock,                \
 486         }
 487
 488 B43_DEBUGFS_FOPS(tsf, tsf_read_file, tsf_write_file, 1);
 489 B43_DEBUGFS_FOPS(ucode_regs, ucode_regs_read_file, NULL, 1);
 490 B43_DEBUGFS_FOPS(shm, shm_read_file, NULL, 1);
 491 B43_DEBUGFS_FOPS(txstat, txstat_read_file, NULL, 0);
 492 B43_DEBUGFS_FOPS(txpower_g, txpower_g_read_file, txpower_g_write_file, 0);
 493 B43_DEBUGFS_FOPS(restart, NULL, restart_write_file, 1);
 494 B43_DEBUGFS_FOPS(loctls, loctls_read_file, NULL, 0);
 495
 496
 497 int b43_debug(struct b43_wldev *dev, enum b43_dyndbg feature)
 498 {
 499         return !!(dev->dfsentry && dev->dfsentry->dyn_debug[feature]);
 500 }
 501
 502 static void b43_remove_dynamic_debug(struct b43_wldev *dev)
 503 {
 504         struct b43_dfsentry *e = dev->dfsentry;
 505         int i;
 506
 507         for (i = 0; i < __B43_NR_DYNDBG; i++)
 508                 debugfs_remove(e->dyn_debug_dentries[i]);
 509 }
 510
 511 static void b43_add_dynamic_debug(struct b43_wldev *dev)
 512 {
 513         struct b43_dfsentry *e = dev->dfsentry;
 514         struct dentry *d;
 515
 516 #define add_dyn_dbg(name, id, initstate) do {           \
 517         e->dyn_debug[id] = (initstate);                 \
 518         d = debugfs_create_bool(name, 0600, e->subdir,  \
 519                                 &(e->dyn_debug[id]));   \
 520         if (!IS_ERR(d))                                 \
 521                 e->dyn_debug_dentries[id] = d;          \
 522                                 } while (0)
 523
 524         add_dyn_dbg("debug_xmitpower", B43_DBG_XMITPOWER, 0);
 525         add_dyn_dbg("debug_dmaoverflow", B43_DBG_DMAOVERFLOW, 0);
 526         add_dyn_dbg("debug_dmaverbose", B43_DBG_DMAVERBOSE, 0);
 527         add_dyn_dbg("debug_pwork_fast", B43_DBG_PWORK_FAST, 0);
 528         add_dyn_dbg("debug_pwork_stop", B43_DBG_PWORK_STOP, 0);
 529
 530 #undef add_dyn_dbg
 531 }
 532
 533 void b43_debugfs_add_device(struct b43_wldev *dev)
 534 {
 535         struct b43_dfsentry *e;
 536         struct b43_txstatus_log *log;
 537         char devdir[16];
 538
 539         B43_WARN_ON(!dev);
 540         e = kzalloc(sizeof(*e), GFP_KERNEL);
 541         if (!e) {
 542                 b43err(dev->wl, "debugfs: add device OOM\n");
 543                 return;
 544         }
 545         e->dev = dev;
 546         log = &e->txstatlog;
 547         log->log = kcalloc(B43_NR_LOGGED_TXSTATUS,
 548                            sizeof(struct b43_txstatus), GFP_KERNEL);
 549         if (!log->log) {
 550                 b43err(dev->wl, "debugfs: add device txstatus OOM\n");
 551                 kfree(e);
 552                 return;
 553         }
 554         log->end = -1;
 555         spin_lock_init(&log->lock);
 556
 557         dev->dfsentry = e;
 558
 559         snprintf(devdir, sizeof(devdir), "%s", wiphy_name(dev->wl->hw->wiphy));
 560         e->subdir = debugfs_create_dir(devdir, rootdir);
 561         if (!e->subdir || IS_ERR(e->subdir)) {
 562                 if (e->subdir == ERR_PTR(-ENODEV)) {
 563                         b43dbg(dev->wl, "DebugFS (CONFIG_DEBUG_FS) not "
 564                                "enabled in kernel config\n");
 565                 } else {
 566                         b43err(dev->wl, "debugfs: cannot create %s directory\n",
 567                                devdir);
 568                 }
 569                 dev->dfsentry = NULL;
 570                 kfree(log->log);
 571                 kfree(e);
 572                 return;
 573         }
 574
 575 #define ADD_FILE(name, mode)    \
 576         do {                                                    \
 577                 struct dentry *d;                               \
 578                 d = debugfs_create_file(__stringify(name),      \
 579                                         mode, e->subdir, dev,   \
 580                                         &fops_##name.fops);     \
 581                 e->file_##name.dentry = NULL;                   \
 582                 if (!IS_ERR(d))                                 \
 583                         e->file_##name.dentry = d;              \
 584         } while (0)
 585
 586
 587         ADD_FILE(tsf, 0600);
 588         ADD_FILE(ucode_regs, 0400);
 589         ADD_FILE(shm, 0400);
 590         ADD_FILE(txstat, 0400);
 591         ADD_FILE(txpower_g, 0600);
 592         ADD_FILE(restart, 0200);
 593         ADD_FILE(loctls, 0400);
 594
 595 #undef ADD_FILE
 596
 597         b43_add_dynamic_debug(dev);
 598 }
 599
 600 void b43_debugfs_remove_device(struct b43_wldev *dev)
 601 {
 602         struct b43_dfsentry *e;
 603
 604         if (!dev)
 605                 return;
 606         e = dev->dfsentry;
 607         if (!e)
 608                 return;
 609         b43_remove_dynamic_debug(dev);
 610
 611         debugfs_remove(e->file_tsf.dentry);
 612         debugfs_remove(e->file_ucode_regs.dentry);
 613         debugfs_remove(e->file_shm.dentry);
 614         debugfs_remove(e->file_txstat.dentry);
 615         debugfs_remove(e->file_txpower_g.dentry);
 616         debugfs_remove(e->file_restart.dentry);
 617         debugfs_remove(e->file_loctls.dentry);
 618
 619         debugfs_remove(e->subdir);
 620         kfree(e->txstatlog.log);
 621         kfree(e);
 622 }
 623
 624 void b43_debugfs_log_txstat(struct b43_wldev *dev,
 625                             const struct b43_txstatus *status)
 626 {
 627         struct b43_dfsentry *e = dev->dfsentry;
 628         struct b43_txstatus_log *log;
 629         struct b43_txstatus *cur;
 630         int i;
 631
 632         if (!e)
 633                 return;
 634         log = &e->txstatlog;
 635         B43_WARN_ON(!irqs_disabled());
 636         spin_lock(&log->lock);
 637         i = log->end + 1;
 638         if (i == B43_NR_LOGGED_TXSTATUS)
 639                 i = 0;
 640         log->end = i;
 641         cur = &(log->log[i]);
 642         memcpy(cur, status, sizeof(*cur));
 643         spin_unlock(&log->lock);
 644 }
 645
 646 void b43_debugfs_init(void)
 647 {
 648         rootdir = debugfs_create_dir(KBUILD_MODNAME, NULL);
 649         if (IS_ERR(rootdir))
 650                 rootdir = NULL;
 651 }
 652
 653 void b43_debugfs_exit(void)
 654 {
 655         debugfs_remove(rootdir);
 656 }