kernel/drivers/usb/host/uhci-debug.c

   1 /*
   2  * UHCI-specific debugging code. Invaluable when something
   3  * goes wrong, but don't get in my face.
   4  *
   5  * Kernel visible pointers are surrounded in []s and bus
   6  * visible pointers are surrounded in ()s
   7  *
   8  * (C) Copyright 1999 Linus Torvalds
   9  * (C) Copyright 1999-2001 Johannes Erdfelt
  10  */
  11
  12 #include <linux/slab.h>
  13 #include <linux/kernel.h>
  14 #include <linux/debugfs.h>
  15 #include <asm/io.h>
  16
  17 #include "uhci-hcd.h"
  18
  19 #define EXTRA_SPACE     1024
  20
  21 static struct dentry *uhci_debugfs_root;
  22
  23 #ifdef CONFIG_DYNAMIC_DEBUG
  24
  25 /* Handle REALLY large printks so we don't overflow buffers */
  26 static void lprintk(char *buf)
  27 {
  28         char *p;
  29
  30         /* Just write one line at a time */
  31         while (buf) {
  32                 p = strchr(buf, '\n');
  33                 if (p)
  34                         *p = 0;
  35                 printk(KERN_DEBUG "%s\n", buf);
  36                 buf = p;
  37                 if (buf)
  38                         buf++;
  39         }
  40 }
  41
  42 static int uhci_show_td(struct uhci_hcd *uhci, struct uhci_td *td, char *buf,
  43                         int len, int space)
  44 {
  45         char *out = buf;
  46         char *spid;
  47         u32 status, token;
  48
  49         status = td_status(uhci, td);
  50         out += sprintf(out, "%*s[%p] link (%08x) ", space, "", td,
  51                 hc32_to_cpu(uhci, td->link));
  52         out += sprintf(out, "e%d %s%s%s%s%s%s%s%s%s%sLength=%x ",
  53                 ((status >> 27) & 3),
  54                 (status & TD_CTRL_SPD) ?      "SPD " : "",
  55                 (status & TD_CTRL_LS) ?       "LS " : "",
  56                 (status & TD_CTRL_IOC) ?      "IOC " : "",
  57                 (status & TD_CTRL_ACTIVE) ?   "Active " : "",
  58                 (status & TD_CTRL_STALLED) ?  "Stalled " : "",
  59                 (status & TD_CTRL_DBUFERR) ?  "DataBufErr " : "",
  60                 (status & TD_CTRL_BABBLE) ?   "Babble " : "",
  61                 (status & TD_CTRL_NAK) ?      "NAK " : "",
  62                 (status & TD_CTRL_CRCTIMEO) ? "CRC/Timeo " : "",
  63                 (status & TD_CTRL_BITSTUFF) ? "BitStuff " : "",
  64                 status & 0x7ff);
  65         if (out - buf > len)
  66                 goto done;
  67
  68         token = td_token(uhci, td);
  69         switch (uhci_packetid(token)) {
  70                 case USB_PID_SETUP:
  71                         spid = "SETUP";
  72                         break;
  73                 case USB_PID_OUT:
  74                         spid = "OUT";
  75                         break;
  76                 case USB_PID_IN:
  77                         spid = "IN";
  78                         break;
  79                 default:
  80                         spid = "?";
  81                         break;
  82         }
  83
  84         out += sprintf(out, "MaxLen=%x DT%d EndPt=%x Dev=%x, PID=%x(%s) ",
  85                 token >> 21,
  86                 ((token >> 19) & 1),
  87                 (token >> 15) & 15,
  88                 (token >> 8) & 127,
  89                 (token & 0xff),
  90                 spid);
  91         out += sprintf(out, "(buf=%08x)\n", hc32_to_cpu(uhci, td->buffer));
  92
  93 done:
  94         if (out - buf > len)
  95                 out += sprintf(out, " ...\n");
  96         return out - buf;
  97 }
  98
  99 static int uhci_show_urbp(struct uhci_hcd *uhci, struct urb_priv *urbp,
 100                         char *buf, int len, int space)
 101 {
 102         char *out = buf;
 103         struct uhci_td *td;
 104         int i, nactive, ninactive;
 105         char *ptype;
 106
 107
 108         out += sprintf(out, "urb_priv [%p] ", urbp);
 109         out += sprintf(out, "urb [%p] ", urbp->urb);
 110         out += sprintf(out, "qh [%p] ", urbp->qh);
 111         out += sprintf(out, "Dev=%d ", usb_pipedevice(urbp->urb->pipe));
 112         out += sprintf(out, "EP=%x(%s) ", usb_pipeendpoint(urbp->urb->pipe),
 113                         (usb_pipein(urbp->urb->pipe) ? "IN" : "OUT"));
 114         if (out - buf > len)
 115                 goto done;
 116
 117         switch (usb_pipetype(urbp->urb->pipe)) {
 118         case PIPE_ISOCHRONOUS: ptype = "ISO"; break;
 119         case PIPE_INTERRUPT: ptype = "INT"; break;
 120         case PIPE_BULK: ptype = "BLK"; break;
 121         default:
 122         case PIPE_CONTROL: ptype = "CTL"; break;
 123         }
 124
 125         out += sprintf(out, "%s%s", ptype, (urbp->fsbr ? " FSBR" : ""));
 126         out += sprintf(out, " Actlen=%d%s", urbp->urb->actual_length,
 127                         (urbp->qh->type == USB_ENDPOINT_XFER_CONTROL ?
 128                                 "-8" : ""));
 129
 130         if (urbp->urb->unlinked)
 131                 out += sprintf(out, " Unlinked=%d", urbp->urb->unlinked);
 132         out += sprintf(out, "\n");
 133
 134         if (out - buf > len)
 135                 goto done;
 136
 137         i = nactive = ninactive = 0;
 138         list_for_each_entry(td, &urbp->td_list, list) {
 139                 if (urbp->qh->type != USB_ENDPOINT_XFER_ISOC &&
 140                                 (++i <= 10 || debug > 2)) {
 141                         out += sprintf(out, "%*s%d: ", space + 2, "", i);
 142                         out += uhci_show_td(uhci, td, out,
 143                                         len - (out - buf), 0);
 144                         if (out - buf > len)
 145                                 goto tail;
 146                 } else {
 147                         if (td_status(uhci, td) & TD_CTRL_ACTIVE)
 148                                 ++nactive;
 149                         else
 150                                 ++ninactive;
 151                 }
 152         }
 153         if (nactive + ninactive > 0)
 154                 out += sprintf(out,
 155                                 "%*s[skipped %d inactive and %d active TDs]\n",
 156                                 space, "", ninactive, nactive);
 157 done:
 158         if (out - buf > len)
 159                 out += sprintf(out, " ...\n");
 160 tail:
 161         return out - buf;
 162 }
 163
 164 static int uhci_show_qh(struct uhci_hcd *uhci,
 165                 struct uhci_qh *qh, char *buf, int len, int space)
 166 {
 167         char *out = buf;
 168         int i, nurbs;
 169         __hc32 element = qh_element(qh);
 170         char *qtype;
 171
 172         switch (qh->type) {
 173         case USB_ENDPOINT_XFER_ISOC: qtype = "ISO"; break;
 174         case USB_ENDPOINT_XFER_INT: qtype = "INT"; break;
 175         case USB_ENDPOINT_XFER_BULK: qtype = "BLK"; break;
 176         case USB_ENDPOINT_XFER_CONTROL: qtype = "CTL"; break;
 177         default: qtype = "Skel" ; break;
 178         }
 179
 180         out += sprintf(out, "%*s[%p] %s QH link (%08x) element (%08x)\n",
 181                         space, "", qh, qtype,
 182                         hc32_to_cpu(uhci, qh->link),
 183                         hc32_to_cpu(uhci, element));
 184         if (qh->type == USB_ENDPOINT_XFER_ISOC)
 185                 out += sprintf(out,
 186                                 "%*s    period %d phase %d load %d us, frame %x desc [%p]\n",
 187                                 space, "", qh->period, qh->phase, qh->load,
 188                                 qh->iso_frame, qh->iso_packet_desc);
 189         else if (qh->type == USB_ENDPOINT_XFER_INT)
 190                 out += sprintf(out, "%*s    period %d phase %d load %d us\n",
 191                                 space, "", qh->period, qh->phase, qh->load);
 192         if (out - buf > len)
 193                 goto done;
 194
 195         if (element & UHCI_PTR_QH(uhci))
 196                 out += sprintf(out, "%*s  Element points to QH (bug?)\n", space, "");
 197
 198         if (element & UHCI_PTR_DEPTH(uhci))
 199                 out += sprintf(out, "%*s  Depth traverse\n", space, "");
 200
 201         if (element & cpu_to_hc32(uhci, 8))
 202                 out += sprintf(out, "%*s  Bit 3 set (bug?)\n", space, "");
 203
 204         if (!(element & ~(UHCI_PTR_QH(uhci) | UHCI_PTR_DEPTH(uhci))))
 205                 out += sprintf(out, "%*s  Element is NULL (bug?)\n", space, "");
 206
 207         if (out - buf > len)
 208                 goto done;
 209
 210         if (list_empty(&qh->queue)) {
 211                 out += sprintf(out, "%*s  queue is empty\n", space, "");
 212                 if (qh == uhci->skel_async_qh) {
 213                         out += uhci_show_td(uhci, uhci->term_td, out,
 214                                         len - (out - buf), 0);
 215                         if (out - buf > len)
 216                                 goto tail;
 217                 }
 218         } else {
 219                 struct urb_priv *urbp = list_entry(qh->queue.next,
 220                                 struct urb_priv, node);
 221                 struct uhci_td *td = list_entry(urbp->td_list.next,
 222                                 struct uhci_td, list);
 223
 224                 if (element != LINK_TO_TD(uhci, td))
 225                         out += sprintf(out, "%*s Element != First TD\n",
 226                                         space, "");
 227                 i = nurbs = 0;
 228                 list_for_each_entry(urbp, &qh->queue, node) {
 229                         if (++i <= 10) {
 230                                 out += uhci_show_urbp(uhci, urbp, out,
 231                                                 len - (out - buf), space + 2);
 232                                 if (out - buf > len)
 233                                         goto tail;
 234                         }
 235                         else
 236                                 ++nurbs;
 237                 }
 238                 if (nurbs > 0)
 239                         out += sprintf(out, "%*s Skipped %d URBs\n",
 240                                         space, "", nurbs);
 241         }
 242
 243         if (out - buf > len)
 244                 goto done;
 245
 246         if (qh->dummy_td) {
 247                 out += sprintf(out, "%*s  Dummy TD\n", space, "");
 248                 out += uhci_show_td(uhci, qh->dummy_td, out,
 249                                 len - (out - buf), 0);
 250                 if (out - buf > len)
 251                         goto tail;
 252         }
 253
 254 done:
 255         if (out - buf > len)
 256                 out += sprintf(out, " ...\n");
 257 tail:
 258         return out - buf;
 259 }
 260
 261 static int uhci_show_sc(int port, unsigned short status, char *buf)
 262 {
 263         return sprintf(buf, "  stat%d     =     %04x  %s%s%s%s%s%s%s%s%s%s\n",
 264                 port,
 265                 status,
 266                 (status & USBPORTSC_SUSP) ?     " Suspend" : "",
 267                 (status & USBPORTSC_OCC) ?      " OverCurrentChange" : "",
 268                 (status & USBPORTSC_OC) ?       " OverCurrent" : "",
 269                 (status & USBPORTSC_PR) ?       " Reset" : "",
 270                 (status & USBPORTSC_LSDA) ?     " LowSpeed" : "",
 271                 (status & USBPORTSC_RD) ?       " ResumeDetect" : "",
 272                 (status & USBPORTSC_PEC) ?      " EnableChange" : "",
 273                 (status & USBPORTSC_PE) ?       " Enabled" : "",
 274                 (status & USBPORTSC_CSC) ?      " ConnectChange" : "",
 275                 (status & USBPORTSC_CCS) ?      " Connected" : "");
 276 }
 277
 278 static int uhci_show_root_hub_state(struct uhci_hcd *uhci, char *buf)
 279 {
 280         char *rh_state;
 281
 282         switch (uhci->rh_state) {
 283             case UHCI_RH_RESET:
 284                 rh_state = "reset";             break;
 285             case UHCI_RH_SUSPENDED:
 286                 rh_state = "suspended";         break;
 287             case UHCI_RH_AUTO_STOPPED:
 288                 rh_state = "auto-stopped";      break;
 289             case UHCI_RH_RESUMING:
 290                 rh_state = "resuming";          break;
 291             case UHCI_RH_SUSPENDING:
 292                 rh_state = "suspending";        break;
 293             case UHCI_RH_RUNNING:
 294                 rh_state = "running";           break;
 295             case UHCI_RH_RUNNING_NODEVS:
 296                 rh_state = "running, no devs";  break;
 297             default:
 298                 rh_state = "?";                 break;
 299         }
 300         return sprintf(buf, "Root-hub state: %s   FSBR: %d\n",
 301                         rh_state, uhci->fsbr_is_on);
 302 }
 303
 304 static int uhci_show_status(struct uhci_hcd *uhci, char *buf, int len)
 305 {
 306         char *out = buf;
 307         unsigned short usbcmd, usbstat, usbint, usbfrnum;
 308         unsigned int flbaseadd;
 309         unsigned char sof;
 310         unsigned short portsc1, portsc2;
 311
 312
 313         usbcmd    = uhci_readw(uhci, USBCMD);
 314         usbstat   = uhci_readw(uhci, USBSTS);
 315         usbint    = uhci_readw(uhci, USBINTR);
 316         usbfrnum  = uhci_readw(uhci, USBFRNUM);
 317         flbaseadd = uhci_readl(uhci, USBFLBASEADD);
 318         sof       = uhci_readb(uhci, USBSOF);
 319         portsc1   = uhci_readw(uhci, USBPORTSC1);
 320         portsc2   = uhci_readw(uhci, USBPORTSC2);
 321
 322         out += sprintf(out, "  usbcmd    =     %04x   %s%s%s%s%s%s%s%s\n",
 323                 usbcmd,
 324                 (usbcmd & USBCMD_MAXP) ?    "Maxp64 " : "Maxp32 ",
 325                 (usbcmd & USBCMD_CF) ?      "CF " : "",
 326                 (usbcmd & USBCMD_SWDBG) ?   "SWDBG " : "",
 327                 (usbcmd & USBCMD_FGR) ?     "FGR " : "",
 328                 (usbcmd & USBCMD_EGSM) ?    "EGSM " : "",
 329                 (usbcmd & USBCMD_GRESET) ?  "GRESET " : "",
 330                 (usbcmd & USBCMD_HCRESET) ? "HCRESET " : "",
 331                 (usbcmd & USBCMD_RS) ?      "RS " : "");
 332         if (out - buf > len)
 333                 goto done;
 334
 335         out += sprintf(out, "  usbstat   =     %04x   %s%s%s%s%s%s\n",
 336                 usbstat,
 337                 (usbstat & USBSTS_HCH) ?    "HCHalted " : "",
 338                 (usbstat & USBSTS_HCPE) ?   "HostControllerProcessError " : "",
 339                 (usbstat & USBSTS_HSE) ?    "HostSystemError " : "",
 340                 (usbstat & USBSTS_RD) ?     "ResumeDetect " : "",
 341                 (usbstat & USBSTS_ERROR) ?  "USBError " : "",
 342                 (usbstat & USBSTS_USBINT) ? "USBINT " : "");
 343         if (out - buf > len)
 344                 goto done;
 345
 346         out += sprintf(out, "  usbint    =     %04x\n", usbint);
 347         out += sprintf(out, "  usbfrnum  =   (%d)%03x\n", (usbfrnum >> 10) & 1,
 348                 0xfff & (4*(unsigned int)usbfrnum));
 349         out += sprintf(out, "  flbaseadd = %08x\n", flbaseadd);
 350         out += sprintf(out, "  sof       =       %02x\n", sof);
 351         if (out - buf > len)
 352                 goto done;
 353
 354         out += uhci_show_sc(1, portsc1, out);
 355         if (out - buf > len)
 356                 goto done;
 357
 358         out += uhci_show_sc(2, portsc2, out);
 359         if (out - buf > len)
 360                 goto done;
 361
 362         out += sprintf(out,
 363                         "Most recent frame: %x (%d)   Last ISO frame: %x (%d)\n",
 364                         uhci->frame_number, uhci->frame_number & 1023,
 365                         uhci->last_iso_frame, uhci->last_iso_frame & 1023);
 366
 367 done:
 368         if (out - buf > len)
 369                 out += sprintf(out, " ...\n");
 370         return out - buf;
 371 }
 372
 373 static int uhci_sprint_schedule(struct uhci_hcd *uhci, char *buf, int len)
 374 {
 375         char *out = buf;
 376         int i, j;
 377         struct uhci_qh *qh;
 378         struct uhci_td *td;
 379         struct list_head *tmp, *head;
 380         int nframes, nerrs;
 381         __hc32 link;
 382         __hc32 fsbr_link;
 383
 384         static const char * const qh_names[] = {
 385                 "unlink", "iso", "int128", "int64", "int32", "int16",
 386                 "int8", "int4", "int2", "async", "term"
 387         };
 388
 389         out += uhci_show_root_hub_state(uhci, out);
 390         if (out - buf > len)
 391                 goto done;
 392         out += sprintf(out, "HC status\n");
 393         out += uhci_show_status(uhci, out, len - (out - buf));
 394         if (out - buf > len)
 395                 goto tail;
 396
 397         out += sprintf(out, "Periodic load table\n");
 398         for (i = 0; i < MAX_PHASE; ++i) {
 399                 out += sprintf(out, "\t%d", uhci->load[i]);
 400                 if (i % 8 == 7)
 401                         *out++ = '\n';
 402         }
 403         out += sprintf(out, "Total: %d, #INT: %d, #ISO: %d\n",
 404                         uhci->total_load,
 405                         uhci_to_hcd(uhci)->self.bandwidth_int_reqs,
 406                         uhci_to_hcd(uhci)->self.bandwidth_isoc_reqs);
 407         if (debug <= 1)
 408                 goto tail;
 409
 410         out += sprintf(out, "Frame List\n");
 411         nframes = 10;
 412         nerrs = 0;
 413         for (i = 0; i < UHCI_NUMFRAMES; ++i) {
 414                 __hc32 qh_dma;
 415
 416                 if (out - buf > len)
 417                         goto done;
 418                 j = 0;
 419                 td = uhci->frame_cpu[i];
 420                 link = uhci->frame[i];
 421                 if (!td)
 422                         goto check_link;
 423
 424                 if (nframes > 0) {
 425                         out += sprintf(out, "- Frame %d -> (%08x)\n",
 426                                         i, hc32_to_cpu(uhci, link));
 427                         j = 1;
 428                 }
 429
 430                 head = &td->fl_list;
 431                 tmp = head;
 432                 do {
 433                         td = list_entry(tmp, struct uhci_td, fl_list);
 434                         tmp = tmp->next;
 435                         if (link != LINK_TO_TD(uhci, td)) {
 436                                 if (nframes > 0) {
 437                                         out += sprintf(out,
 438                                                 "    link does not match list entry!\n");
 439                                         if (out - buf > len)
 440                                                 goto done;
 441                                 } else
 442                                         ++nerrs;
 443                         }
 444                         if (nframes > 0) {
 445                                 out += uhci_show_td(uhci, td, out,
 446                                                 len - (out - buf), 4);
 447                                 if (out - buf > len)
 448                                         goto tail;
 449                         }
 450                         link = td->link;
 451                 } while (tmp != head);
 452
 453 check_link:
 454                 qh_dma = uhci_frame_skel_link(uhci, i);
 455                 if (link != qh_dma) {
 456                         if (nframes > 0) {
 457                                 if (!j) {
 458                                         out += sprintf(out,
 459                                                 "- Frame %d -> (%08x)\n",
 460                                                 i, hc32_to_cpu(uhci, link));
 461                                         j = 1;
 462                                 }
 463                                 out += sprintf(out,
 464                                         "   link does not match QH (%08x)!\n",
 465                                         hc32_to_cpu(uhci, qh_dma));
 466                                 if (out - buf > len)
 467                                         goto done;
 468                         } else
 469                                 ++nerrs;
 470                 }
 471                 nframes -= j;
 472         }
 473         if (nerrs > 0)
 474                 out += sprintf(out, "Skipped %d bad links\n", nerrs);
 475
 476         out += sprintf(out, "Skeleton QHs\n");
 477
 478         if (out - buf > len)
 479                 goto done;
 480
 481         fsbr_link = 0;
 482         for (i = 0; i < UHCI_NUM_SKELQH; ++i) {
 483                 int cnt = 0;
 484
 485                 qh = uhci->skelqh[i];
 486                 out += sprintf(out, "- skel_%s_qh\n", qh_names[i]);
 487                 out += uhci_show_qh(uhci, qh, out, len - (out - buf), 4);
 488                 if (out - buf > len)
 489                         goto tail;
 490
 491                 /* Last QH is the Terminating QH, it's different */
 492                 if (i == SKEL_TERM) {
 493                         if (qh_element(qh) != LINK_TO_TD(uhci, uhci->term_td)) {
 494                                 out += sprintf(out,
 495                                         "    skel_term_qh element is not set to term_td!\n");
 496                                 if (out - buf > len)
 497                                         goto done;
 498                         }
 499                         link = fsbr_link;
 500                         if (!link)
 501                                 link = LINK_TO_QH(uhci, uhci->skel_term_qh);
 502                         goto check_qh_link;
 503                 }
 504
 505                 head = &qh->node;
 506                 tmp = head->next;
 507
 508                 while (tmp != head) {
 509                         qh = list_entry(tmp, struct uhci_qh, node);
 510                         tmp = tmp->next;
 511                         if (++cnt <= 10) {
 512                                 out += uhci_show_qh(uhci, qh, out,
 513                                                 len - (out - buf), 4);
 514                                 if (out - buf > len)
 515                                         goto tail;
 516                         }
 517                         if (!fsbr_link && qh->skel >= SKEL_FSBR)
 518                                 fsbr_link = LINK_TO_QH(uhci, qh);
 519                 }
 520                 if ((cnt -= 10) > 0)
 521                         out += sprintf(out, "    Skipped %d QHs\n", cnt);
 522
 523                 link = UHCI_PTR_TERM(uhci);
 524                 if (i <= SKEL_ISO)
 525                         ;
 526                 else if (i < SKEL_ASYNC)
 527                         link = LINK_TO_QH(uhci, uhci->skel_async_qh);
 528                 else if (!uhci->fsbr_is_on)
 529                         ;
 530                 else
 531                         link = LINK_TO_QH(uhci, uhci->skel_term_qh);
 532 check_qh_link:
 533                 if (qh->link != link)
 534                         out += sprintf(out,
 535                                 "    last QH not linked to next skeleton!\n");
 536
 537                 if (out - buf > len)
 538                         goto done;
 539         }
 540
 541 done:
 542         if (out - buf > len)
 543                 out += sprintf(out, " ...\n");
 544 tail:
 545         return out - buf;
 546 }
 547
 548 #ifdef CONFIG_DEBUG_FS
 549
 550 #define MAX_OUTPUT      (64 * 1024)
 551
 552 struct uhci_debug {
 553         int size;
 554         char *data;
 555 };
 556
 557 static int uhci_debug_open(struct inode *inode, struct file *file)
 558 {
 559         struct uhci_hcd *uhci = inode->i_private;
 560         struct uhci_debug *up;
 561         unsigned long flags;
 562
 563         up = kmalloc(sizeof(*up), GFP_KERNEL);
 564         if (!up)
 565                 return -ENOMEM;
 566
 567         up->data = kmalloc(MAX_OUTPUT, GFP_KERNEL);
 568         if (!up->data) {
 569                 kfree(up);
 570                 return -ENOMEM;
 571         }
 572
 573         up->size = 0;
 574         spin_lock_irqsave(&uhci->lock, flags);
 575         if (uhci->is_initialized)
 576                 up->size = uhci_sprint_schedule(uhci, up->data,
 577                                         MAX_OUTPUT - EXTRA_SPACE);
 578         spin_unlock_irqrestore(&uhci->lock, flags);
 579
 580         file->private_data = up;
 581
 582         return 0;
 583 }
 584
 585 static loff_t uhci_debug_lseek(struct file *file, loff_t off, int whence)
 586 {
 587         struct uhci_debug *up;
 588         loff_t new = -1;
 589
 590         up = file->private_data;
 591
 592         /*
 593          * XXX: atomic 64bit seek access, but that needs to be fixed in the VFS
 594          */
 595         switch (whence) {
 596         case 0:
 597                 new = off;
 598                 break;
 599         case 1:
 600                 new = file->f_pos + off;
 601                 break;
 602         }
 603
 604         if (new < 0 || new > up->size)
 605                 return -EINVAL;
 606
 607         return (file->f_pos = new);
 608 }
 609
 610 static ssize_t uhci_debug_read(struct file *file, char __user *buf,
 611                                 size_t nbytes, loff_t *ppos)
 612 {
 613         struct uhci_debug *up = file->private_data;
 614         return simple_read_from_buffer(buf, nbytes, ppos, up->data, up->size);
 615 }
 616
 617 static int uhci_debug_release(struct inode *inode, struct file *file)
 618 {
 619         struct uhci_debug *up = file->private_data;
 620
 621         kfree(up->data);
 622         kfree(up);
 623
 624         return 0;
 625 }
 626
 627 static const struct file_operations uhci_debug_operations = {
 628         .owner =        THIS_MODULE,
 629         .open =         uhci_debug_open,
 630         .llseek =       uhci_debug_lseek,
 631         .read =         uhci_debug_read,
 632         .release =      uhci_debug_release,
 633 };
 634 #define UHCI_DEBUG_OPS
 635
 636 #endif  /* CONFIG_DEBUG_FS */
 637
 638 #else   /* CONFIG_DYNAMIC_DEBUG*/
 639
 640 static inline void lprintk(char *buf)
 641 {}
 642
 643 static inline int uhci_show_qh(struct uhci_hcd *uhci,
 644                 struct uhci_qh *qh, char *buf, int len, int space)
 645 {
 646         return 0;
 647 }
 648
 649 static inline int uhci_sprint_schedule(struct uhci_hcd *uhci,
 650                 char *buf, int len)
 651 {
 652         return 0;
 653 }
 654
 655 #endif