git.oblomov.eu Git - linux-2.6/blob - 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 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 ssize_t tsf_read_file(struct b43_wldev *dev, 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 int tsf_write_file(struct b43_wldev *dev, const char *buf, size_t count)
  94 {
  95         u64 tsf;
  96
  97         if (sscanf(buf, "%llu", (unsigned long long *)(&tsf)) != 1)
  98                 return -EINVAL;
  99         b43_tsf_write(dev, tsf);
 100
 101         return 0;
 102 }
 103
 104 /* wl->irq_lock is locked */
 105 ssize_t ucode_regs_read_file(struct b43_wldev *dev, char *buf, size_t bufsize)
 106 {
 107         ssize_t count = 0;
 108         int i;
 109
 110         for (i = 0; i < 64; i++) {
 111                 fappend("r%d = 0x%04x\n", i,
 112                         b43_shm_read16(dev, B43_SHM_SCRATCH, i));
 113         }
 114
 115         return count;
 116 }
 117
 118 /* wl->irq_lock is locked */
 119 ssize_t shm_read_file(struct b43_wldev *dev, char *buf, size_t bufsize)
 120 {
 121         ssize_t count = 0;
 122         int i;
 123         u16 tmp;
 124         __le16 *le16buf = (__le16 *)buf;
 125
 126         for (i = 0; i < 0x1000; i++) {
 127                 if (bufsize <= 0)
 128                         break;
 129                 tmp = b43_shm_read16(dev, B43_SHM_SHARED, 2 * i);
 130                 le16buf[i] = cpu_to_le16(tmp);
 131                 count += sizeof(tmp);
 132                 bufsize -= sizeof(tmp);
 133         }
 134
 135         return count;
 136 }
 137
 138 ssize_t txstat_read_file(struct b43_wldev *dev, char *buf, size_t bufsize)
 139 {
 140         struct b43_txstatus_log *log = &dev->dfsentry->txstatlog;
 141         ssize_t count = 0;
 142         unsigned long flags;
 143         int i, idx;
 144         struct b43_txstatus *stat;
 145
 146         spin_lock_irqsave(&log->lock, flags);
 147         if (log->end < 0) {
 148                 fappend("Nothing transmitted, yet\n");
 149                 goto out_unlock;
 150         }
 151         fappend("b43 TX status reports:\n\n"
 152                 "index | cookie | seq | phy_stat | frame_count | "
 153                 "rts_count | supp_reason | pm_indicated | "
 154                 "intermediate | for_ampdu | acked\n" "---\n");
 155         i = log->end + 1;
 156         idx = 0;
 157         while (1) {
 158                 if (i == B43_NR_LOGGED_TXSTATUS)
 159                         i = 0;
 160                 stat = &(log->log[i]);
 161                 if (stat->cookie) {
 162                         fappend("%03d | "
 163                                 "0x%04X | 0x%04X | 0x%02X | "
 164                                 "0x%X | 0x%X | "
 165                                 "%u | %u | "
 166                                 "%u | %u | %u\n",
 167                                 idx,
 168                                 stat->cookie, stat->seq, stat->phy_stat,
 169                                 stat->frame_count, stat->rts_count,
 170                                 stat->supp_reason, stat->pm_indicated,
 171                                 stat->intermediate, stat->for_ampdu,
 172                                 stat->acked);
 173                         idx++;
 174                 }
 175                 if (i == log->end)
 176                         break;
 177                 i++;
 178         }
 179 out_unlock:
 180         spin_unlock_irqrestore(&log->lock, flags);
 181
 182         return count;
 183 }
 184
 185 ssize_t txpower_g_read_file(struct b43_wldev *dev, char *buf, size_t bufsize)
 186 {
 187         ssize_t count = 0;
 188
 189         if (dev->phy.type != B43_PHYTYPE_G) {
 190                 fappend("Device is not a G-PHY\n");
 191                 goto out;
 192         }
 193         fappend("Control:               %s\n", dev->phy.manual_txpower_control ?
 194                 "MANUAL" : "AUTOMATIC");
 195         fappend("Baseband attenuation:  %u\n", dev->phy.bbatt.att);
 196         fappend("Radio attenuation:     %u\n", dev->phy.rfatt.att);
 197         fappend("TX Mixer Gain:         %s\n",
 198                 (dev->phy.tx_control & B43_TXCTL_TXMIX) ? "ON" : "OFF");
 199         fappend("PA Gain 2dB:           %s\n",
 200                 (dev->phy.tx_control & B43_TXCTL_PA2DB) ? "ON" : "OFF");
 201         fappend("PA Gain 3dB:           %s\n",
 202                 (dev->phy.tx_control & B43_TXCTL_PA3DB) ? "ON" : "OFF");
 203         fappend("\n\n");
 204         fappend("You can write to this file:\n");
 205         fappend("Writing \"auto\" enables automatic txpower control.\n");
 206         fappend
 207             ("Writing the attenuation values as \"bbatt rfatt txmix pa2db pa3db\" "
 208              "enables manual txpower control.\n");
 209         fappend("Example: 5 4 0 0 1\n");
 210         fappend("Enables manual control with Baseband attenuation 5, "
 211                 "Radio attenuation 4, No TX Mixer Gain, "
 212                 "No PA Gain 2dB, With PA Gain 3dB.\n");
 213 out:
 214         return count;
 215 }
 216
 217 int txpower_g_write_file(struct b43_wldev *dev, const char *buf, size_t count)
 218 {
 219         unsigned long flags;
 220         unsigned long phy_flags;
 221         int err = 0;
 222
 223         spin_lock_irqsave(&dev->wl->irq_lock, flags);
 224         if (dev->phy.type != B43_PHYTYPE_G) {
 225                 err = -ENODEV;
 226                 goto out_unlock;
 227         }
 228         if ((count >= 4) && (memcmp(buf, "auto", 4) == 0)) {
 229                 /* Automatic control */
 230                 dev->phy.manual_txpower_control = 0;
 231                 b43_phy_xmitpower(dev);
 232         } else {
 233                 int bbatt = 0, rfatt = 0, txmix = 0, pa2db = 0, pa3db = 0;
 234                 /* Manual control */
 235                 if (sscanf(buf, "%d %d %d %d %d", &bbatt, &rfatt,
 236                            &txmix, &pa2db, &pa3db) != 5) {
 237                         err = -EINVAL;
 238                         goto out_unlock;
 239                 }
 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 out_unlock:
 259         spin_unlock_irqrestore(&dev->wl->irq_lock, flags);
 260
 261         return err;
 262 }
 263
 264 /* wl->irq_lock is locked */
 265 int restart_write_file(struct b43_wldev *dev, const char *buf, size_t count)
 266 {
 267         int err = 0;
 268
 269         if (count > 0 && buf[0] == '1') {
 270                 b43_controller_restart(dev, "manually restarted");
 271         } else
 272                 err = -EINVAL;
 273
 274         return err;
 275 }
 276
 277 static ssize_t append_lo_table(ssize_t count, char *buf, const size_t bufsize,
 278                                struct b43_loctl table[B43_NR_BB][B43_NR_RF])
 279 {
 280         unsigned int i, j;
 281         struct b43_loctl *ctl;
 282
 283         for (i = 0; i < B43_NR_BB; i++) {
 284                 for (j = 0; j < B43_NR_RF; j++) {
 285                         ctl = &(table[i][j]);
 286                         fappend("(bbatt %2u, rfatt %2u)  ->  "
 287                                 "(I %+3d, Q %+3d, Used: %d, Calibrated: %d)\n",
 288                                 i, j, ctl->i, ctl->q,
 289                                 ctl->used,
 290                                 b43_loctl_is_calibrated(ctl));
 291                 }
 292         }
 293
 294         return count;
 295 }
 296
 297 ssize_t loctls_read_file(struct b43_wldev *dev, 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                 memset(buf, 0, bufsize);
 387                 if (dfops->take_irqlock) {
 388                         spin_lock_irq(&dev->wl->irq_lock);
 389                         ret = dfops->read(dev, buf, bufsize);
 390                         spin_unlock_irq(&dev->wl->irq_lock);
 391                 } else
 392                         ret = dfops->read(dev, buf, bufsize);
 393                 if (ret <= 0) {
 394                         free_pages((unsigned long)buf, buforder);
 395                         err = ret;
 396                         goto out_unlock;
 397                 }
 398                 dfile->data_len = ret;
 399                 dfile->buffer = buf;
 400         }
 401
 402         ret = simple_read_from_buffer(userbuf, count, ppos,
 403                                       dfile->buffer,
 404                                       dfile->data_len);
 405         if (*ppos >= dfile->data_len) {
 406                 free_pages((unsigned long)dfile->buffer, buforder);
 407                 dfile->buffer = NULL;
 408                 dfile->data_len = 0;
 409         }
 410 out_unlock:
 411         mutex_unlock(&dev->wl->mutex);
 412
 413         return err ? err : ret;
 414 }
 415
 416 static ssize_t b43_debugfs_write(struct file *file,
 417                                  const char __user *userbuf,
 418                                  size_t count, loff_t *ppos)
 419 {
 420         struct b43_wldev *dev;
 421         struct b43_debugfs_fops *dfops;
 422         char *buf;
 423         int err = 0;
 424
 425         if (!count)
 426                 return 0;
 427         if (count > PAGE_SIZE)
 428                 return -E2BIG;
 429         dev = file->private_data;
 430         if (!dev)
 431                 return -ENODEV;
 432
 433         mutex_lock(&dev->wl->mutex);
 434         if (b43_status(dev) < B43_STAT_INITIALIZED) {
 435                 err = -ENODEV;
 436                 goto out_unlock;
 437         }
 438
 439         dfops = container_of(file->f_op, struct b43_debugfs_fops, fops);
 440         if (!dfops->write) {
 441                 err = -ENOSYS;
 442                 goto out_unlock;
 443         }
 444
 445         buf = (char *)get_zeroed_page(GFP_KERNEL);
 446         if (!buf) {
 447                 err = -ENOMEM;
 448                 goto out_unlock;
 449         }
 450         if (copy_from_user(buf, userbuf, count)) {
 451                 err = -EFAULT;
 452                 goto out_freepage;
 453         }
 454         if (dfops->take_irqlock) {
 455                 spin_lock_irq(&dev->wl->irq_lock);
 456                 err = dfops->write(dev, buf, count);
 457                 spin_unlock_irq(&dev->wl->irq_lock);
 458         } else
 459                 err = dfops->write(dev, buf, count);
 460         if (err)
 461                 goto out_freepage;
 462
 463 out_freepage:
 464         free_page((unsigned long)buf);
 465 out_unlock:
 466         mutex_unlock(&dev->wl->mutex);
 467
 468         return err ? err : count;
 469 }
 470
 471
 472 #define B43_DEBUGFS_FOPS(name, _read, _write, _take_irqlock)    \
 473         static struct b43_debugfs_fops fops_##name = {          \
 474                 .read   = _read,                                \
 475                 .write  = _write,                               \
 476                 .fops   = {                                     \
 477                         .open   = b43_debugfs_open,             \
 478                         .read   = b43_debugfs_read,             \
 479                         .write  = b43_debugfs_write,            \
 480                 },                                              \
 481                 .file_struct_offset = offsetof(struct b43_dfsentry, \
 482                                                file_##name),    \
 483                 .take_irqlock   = _take_irqlock,                \
 484         }
 485
 486 B43_DEBUGFS_FOPS(tsf, tsf_read_file, tsf_write_file, 1);
 487 B43_DEBUGFS_FOPS(ucode_regs, ucode_regs_read_file, NULL, 1);
 488 B43_DEBUGFS_FOPS(shm, shm_read_file, NULL, 1);
 489 B43_DEBUGFS_FOPS(txstat, txstat_read_file, NULL, 0);
 490 B43_DEBUGFS_FOPS(txpower_g, txpower_g_read_file, txpower_g_write_file, 0);
 491 B43_DEBUGFS_FOPS(restart, NULL, restart_write_file, 1);
 492 B43_DEBUGFS_FOPS(loctls, loctls_read_file, NULL, 0);
 493
 494
 495 int b43_debug(struct b43_wldev *dev, enum b43_dyndbg feature)
 496 {
 497         return !!(dev->dfsentry && dev->dfsentry->dyn_debug[feature]);
 498 }
 499
 500 static void b43_remove_dynamic_debug(struct b43_wldev *dev)
 501 {
 502         struct b43_dfsentry *e = dev->dfsentry;
 503         int i;
 504
 505         for (i = 0; i < __B43_NR_DYNDBG; i++)
 506                 debugfs_remove(e->dyn_debug_dentries[i]);
 507 }
 508
 509 static void b43_add_dynamic_debug(struct b43_wldev *dev)
 510 {
 511         struct b43_dfsentry *e = dev->dfsentry;
 512         struct dentry *d;
 513
 514 #define add_dyn_dbg(name, id, initstate) do {           \
 515         e->dyn_debug[id] = (initstate);                 \
 516         d = debugfs_create_bool(name, 0600, e->subdir,  \
 517                                 &(e->dyn_debug[id]));   \
 518         if (!IS_ERR(d))                                 \
 519                 e->dyn_debug_dentries[id] = d;          \
 520                                 } while (0)
 521
 522         add_dyn_dbg("debug_xmitpower", B43_DBG_XMITPOWER, 0);
 523         add_dyn_dbg("debug_dmaoverflow", B43_DBG_DMAOVERFLOW, 0);
 524         add_dyn_dbg("debug_dmaverbose", B43_DBG_DMAVERBOSE, 0);
 525         add_dyn_dbg("debug_pwork_fast", B43_DBG_PWORK_FAST, 0);
 526         add_dyn_dbg("debug_pwork_stop", B43_DBG_PWORK_STOP, 0);
 527
 528 #undef add_dyn_dbg
 529 }
 530
 531 void b43_debugfs_add_device(struct b43_wldev *dev)
 532 {
 533         struct b43_dfsentry *e;
 534         struct b43_txstatus_log *log;
 535         char devdir[16];
 536
 537         B43_WARN_ON(!dev);
 538         e = kzalloc(sizeof(*e), GFP_KERNEL);
 539         if (!e) {
 540                 b43err(dev->wl, "debugfs: add device OOM\n");
 541                 return;
 542         }
 543         e->dev = dev;
 544         log = &e->txstatlog;
 545         log->log = kcalloc(B43_NR_LOGGED_TXSTATUS,
 546                            sizeof(struct b43_txstatus), GFP_KERNEL);
 547         if (!log->log) {
 548                 b43err(dev->wl, "debugfs: add device txstatus OOM\n");
 549                 kfree(e);
 550                 return;
 551         }
 552         log->end = -1;
 553         spin_lock_init(&log->lock);
 554
 555         dev->dfsentry = e;
 556
 557         snprintf(devdir, sizeof(devdir), "%s", wiphy_name(dev->wl->hw->wiphy));
 558         e->subdir = debugfs_create_dir(devdir, rootdir);
 559         if (!e->subdir || IS_ERR(e->subdir)) {
 560                 if (e->subdir == ERR_PTR(-ENODEV)) {
 561                         b43dbg(dev->wl, "DebugFS (CONFIG_DEBUG_FS) not "
 562                                "enabled in kernel config\n");
 563                 } else {
 564                         b43err(dev->wl, "debugfs: cannot create %s directory\n",
 565                                devdir);
 566                 }
 567                 dev->dfsentry = NULL;
 568                 kfree(log->log);
 569                 kfree(e);
 570                 return;
 571         }
 572
 573 #define ADD_FILE(name, mode)    \
 574         do {                                                    \
 575                 struct dentry *d;                               \
 576                 d = debugfs_create_file(__stringify(name),      \
 577                                         mode, e->subdir, dev,   \
 578                                         &fops_##name.fops);     \
 579                 e->file_##name.dentry = NULL;                   \
 580                 if (!IS_ERR(d))                                 \
 581                         e->file_##name.dentry = d;              \
 582         } while (0)
 583
 584
 585         ADD_FILE(tsf, 0600);
 586         ADD_FILE(ucode_regs, 0400);
 587         ADD_FILE(shm, 0400);
 588         ADD_FILE(txstat, 0400);
 589         ADD_FILE(txpower_g, 0600);
 590         ADD_FILE(restart, 0200);
 591         ADD_FILE(loctls, 0400);
 592
 593 #undef ADD_FILE
 594
 595         b43_add_dynamic_debug(dev);
 596 }
 597
 598 void b43_debugfs_remove_device(struct b43_wldev *dev)
 599 {
 600         struct b43_dfsentry *e;
 601
 602         if (!dev)
 603                 return;
 604         e = dev->dfsentry;
 605         if (!e)
 606                 return;
 607         b43_remove_dynamic_debug(dev);
 608
 609         debugfs_remove(e->file_tsf.dentry);
 610         debugfs_remove(e->file_ucode_regs.dentry);
 611         debugfs_remove(e->file_shm.dentry);
 612         debugfs_remove(e->file_txstat.dentry);
 613         debugfs_remove(e->file_txpower_g.dentry);
 614         debugfs_remove(e->file_restart.dentry);
 615         debugfs_remove(e->file_loctls.dentry);
 616
 617         debugfs_remove(e->subdir);
 618         kfree(e->txstatlog.log);
 619         kfree(e);
 620 }
 621
 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         B43_WARN_ON(!irqs_disabled());
 634         spin_lock(&log->lock);
 635         i = log->end + 1;
 636         if (i == B43_NR_LOGGED_TXSTATUS)
 637                 i = 0;
 638         log->end = i;
 639         cur = &(log->log[i]);
 640         memcpy(cur, status, sizeof(*cur));
 641         spin_unlock(&log->lock);
 642 }
 643
 644 void b43_debugfs_init(void)
 645 {
 646         rootdir = debugfs_create_dir(KBUILD_MODNAME, NULL);
 647         if (IS_ERR(rootdir))
 648                 rootdir = NULL;
 649 }
 650
 651 void b43_debugfs_exit(void)
 652 {
 653         debugfs_remove(rootdir);
 654 }