SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/ide/ide-proc.c

   1 /*
   2  *  Copyright (C) 1997-1998     Mark Lord
   3  *  Copyright (C) 2003          Red Hat
   4  *
   5  *  Some code was moved here from ide.c, see it for original copyrights.
   6  */
   7
   8 /*
   9  * This is the /proc/ide/ filesystem implementation.
  10  *
  11  * Drive/Driver settings can be retrieved by reading the drive's
  12  * "settings" files.  e.g.    "cat /proc/ide0/hda/settings"
  13  * To write a new value "val" into a specific setting "name", use:
  14  *   echo "name:val" >/proc/ide/ide0/hda/settings
  15  */
  16
  17 #include <linux/module.h>
  18
  19 #include <asm/uaccess.h>
  20 #include <linux/errno.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/stat.h>
  23 #include <linux/mm.h>
  24 #include <linux/pci.h>
  25 #include <linux/ctype.h>
  26 #include <linux/ide.h>
  27 #include <linux/seq_file.h>
  28
  29 #include <asm/io.h>
  30
  31 static struct proc_dir_entry *proc_ide_root;
  32
  33 static int proc_ide_read_imodel
  34         (char *page, char **start, off_t off, int count, int *eof, void *data)
  35 {
  36         ide_hwif_t      *hwif = (ide_hwif_t *) data;
  37         int             len;
  38         const char      *name;
  39
  40         switch (hwif->chipset) {
  41         case ide_generic:       name = "generic";       break;
  42         case ide_pci:           name = "pci";           break;
  43         case ide_cmd640:        name = "cmd640";        break;
  44         case ide_dtc2278:       name = "dtc2278";       break;
  45         case ide_ali14xx:       name = "ali14xx";       break;
  46         case ide_qd65xx:        name = "qd65xx";        break;
  47         case ide_umc8672:       name = "umc8672";       break;
  48         case ide_ht6560b:       name = "ht6560b";       break;
  49         case ide_trm290:        name = "trm290";        break;
  50         case ide_cy82c693:      name = "cy82c693";      break;
  51         case ide_4drives:       name = "4drives";       break;
  52         case ide_pmac:          name = "mac-io";        break;
  53         case ide_au1xxx:        name = "au1xxx";        break;
  54         case ide_palm3710:      name = "palm3710";      break;
  55         case ide_acorn:         name = "acorn";         break;
  56         default:                name = "(unknown)";     break;
  57         }
  58         len = sprintf(page, "%s\n", name);
  59         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  60 }
  61
  62 static int proc_ide_read_mate
  63         (char *page, char **start, off_t off, int count, int *eof, void *data)
  64 {
  65         ide_hwif_t      *hwif = (ide_hwif_t *) data;
  66         int             len;
  67
  68         if (hwif && hwif->mate)
  69                 len = sprintf(page, "%s\n", hwif->mate->name);
  70         else
  71                 len = sprintf(page, "(none)\n");
  72         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  73 }
  74
  75 static int proc_ide_read_channel
  76         (char *page, char **start, off_t off, int count, int *eof, void *data)
  77 {
  78         ide_hwif_t      *hwif = (ide_hwif_t *) data;
  79         int             len;
  80
  81         page[0] = hwif->channel ? '1' : '0';
  82         page[1] = '\n';
  83         len = 2;
  84         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  85 }
  86
  87 static int proc_ide_read_identify
  88         (char *page, char **start, off_t off, int count, int *eof, void *data)
  89 {
  90         ide_drive_t     *drive = (ide_drive_t *)data;
  91         int             len = 0, i = 0;
  92         int             err = 0;
  93
  94         len = sprintf(page, "\n");
  95
  96         if (drive) {
  97                 __le16 *val = (__le16 *)page;
  98
  99                 err = taskfile_lib_get_identify(drive, page);
 100                 if (!err) {
 101                         char *out = (char *)page + SECTOR_SIZE;
 102
 103                         page = out;
 104                         do {
 105                                 out += sprintf(out, "%04x%c",
 106                                         le16_to_cpup(val), (++i & 7) ? ' ' : '\n');
 107                                 val += 1;
 108                         } while (i < SECTOR_SIZE / 2);
 109                         len = out - page;
 110                 }
 111         }
 112         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 113 }
 114
 115 /**
 116  *      ide_find_setting        -       find a specific setting
 117  *      @st: setting table pointer
 118  *      @name: setting name
 119  *
 120  *      Scan's the setting table for a matching entry and returns
 121  *      this or NULL if no entry is found. The caller must hold the
 122  *      setting semaphore
 123  */
 124
 125 static
 126 const struct ide_proc_devset *ide_find_setting(const struct ide_proc_devset *st,
 127                                                char *name)
 128 {
 129         while (st->name) {
 130                 if (strcmp(st->name, name) == 0)
 131                         break;
 132                 st++;
 133         }
 134         return st->name ? st : NULL;
 135 }
 136
 137 /**
 138  *      ide_read_setting        -       read an IDE setting
 139  *      @drive: drive to read from
 140  *      @setting: drive setting
 141  *
 142  *      Read a drive setting and return the value. The caller
 143  *      must hold the ide_setting_mtx when making this call.
 144  *
 145  *      BUGS: the data return and error are the same return value
 146  *      so an error -EINVAL and true return of the same value cannot
 147  *      be told apart
 148  */
 149
 150 static int ide_read_setting(ide_drive_t *drive,
 151                             const struct ide_proc_devset *setting)
 152 {
 153         const struct ide_devset *ds = setting->setting;
 154         int val = -EINVAL;
 155
 156         if (ds->get)
 157                 val = ds->get(drive);
 158
 159         return val;
 160 }
 161
 162 /**
 163  *      ide_write_setting       -       read an IDE setting
 164  *      @drive: drive to read from
 165  *      @setting: drive setting
 166  *      @val: value
 167  *
 168  *      Write a drive setting if it is possible. The caller
 169  *      must hold the ide_setting_mtx when making this call.
 170  *
 171  *      BUGS: the data return and error are the same return value
 172  *      so an error -EINVAL and true return of the same value cannot
 173  *      be told apart
 174  *
 175  *      FIXME:  This should be changed to enqueue a special request
 176  *      to the driver to change settings, and then wait on a sema for completion.
 177  *      The current scheme of polling is kludgy, though safe enough.
 178  */
 179
 180 static int ide_write_setting(ide_drive_t *drive,
 181                              const struct ide_proc_devset *setting, int val)
 182 {
 183         const struct ide_devset *ds = setting->setting;
 184
 185         if (!capable(CAP_SYS_ADMIN))
 186                 return -EACCES;
 187         if (!ds->set)
 188                 return -EPERM;
 189         if ((ds->flags & DS_SYNC)
 190             && (val < setting->min || val > setting->max))
 191                 return -EINVAL;
 192         return ide_devset_execute(drive, ds, val);
 193 }
 194
 195 ide_devset_get(xfer_rate, current_speed);
 196
 197 static int set_xfer_rate (ide_drive_t *drive, int arg)
 198 {
 199         ide_task_t task;
 200         int err;
 201
 202         if (arg < XFER_PIO_0 || arg > XFER_UDMA_6)
 203                 return -EINVAL;
 204
 205         memset(&task, 0, sizeof(task));
 206         task.tf.command = ATA_CMD_SET_FEATURES;
 207         task.tf.feature = SETFEATURES_XFER;
 208         task.tf.nsect   = (u8)arg;
 209         task.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT |
 210                         IDE_TFLAG_IN_NSECT;
 211
 212         err = ide_no_data_taskfile(drive, &task);
 213
 214         if (!err) {
 215                 ide_set_xfer_rate(drive, (u8) arg);
 216                 ide_driveid_update(drive);
 217         }
 218         return err;
 219 }
 220
 221 ide_devset_rw(current_speed, xfer_rate);
 222 ide_devset_rw_field(init_speed, init_speed);
 223 ide_devset_rw_flag(nice1, IDE_DFLAG_NICE1);
 224 ide_devset_rw_field(number, dn);
 225
 226 static const struct ide_proc_devset ide_generic_settings[] = {
 227         IDE_PROC_DEVSET(current_speed, 0, 70),
 228         IDE_PROC_DEVSET(init_speed, 0, 70),
 229         IDE_PROC_DEVSET(io_32bit,  0, 1 + (SUPPORT_VLB_SYNC << 1)),
 230         IDE_PROC_DEVSET(keepsettings, 0, 1),
 231         IDE_PROC_DEVSET(nice1, 0, 1),
 232         IDE_PROC_DEVSET(number, 0, 3),
 233         IDE_PROC_DEVSET(pio_mode, 0, 255),
 234         IDE_PROC_DEVSET(unmaskirq, 0, 1),
 235         IDE_PROC_DEVSET(using_dma, 0, 1),
 236         { 0 },
 237 };
 238
 239 static void proc_ide_settings_warn(void)
 240 {
 241         static int warned;
 242
 243         if (warned)
 244                 return;
 245
 246         printk(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "
 247                             "obsolete, and will be removed soon!\n");
 248         warned = 1;
 249 }
 250
 251 static int proc_ide_read_settings
 252         (char *page, char **start, off_t off, int count, int *eof, void *data)
 253 {
 254         const struct ide_proc_devset *setting, *g, *d;
 255         const struct ide_devset *ds;
 256         ide_drive_t     *drive = (ide_drive_t *) data;
 257         char            *out = page;
 258         int             len, rc, mul_factor, div_factor;
 259
 260         proc_ide_settings_warn();
 261
 262         mutex_lock(&ide_setting_mtx);
 263         g = ide_generic_settings;
 264         d = drive->settings;
 265         out += sprintf(out, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
 266         out += sprintf(out, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
 267         while (g->name || (d && d->name)) {
 268                 /* read settings in the alphabetical order */
 269                 if (g->name && d && d->name) {
 270                         if (strcmp(d->name, g->name) < 0)
 271                                 setting = d++;
 272                         else
 273                                 setting = g++;
 274                 } else if (d && d->name) {
 275                         setting = d++;
 276                 } else
 277                         setting = g++;
 278                 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
 279                 div_factor = setting->divf ? setting->divf(drive) : 1;
 280                 out += sprintf(out, "%-24s", setting->name);
 281                 rc = ide_read_setting(drive, setting);
 282                 if (rc >= 0)
 283                         out += sprintf(out, "%-16d", rc * mul_factor / div_factor);
 284                 else
 285                         out += sprintf(out, "%-16s", "write-only");
 286                 out += sprintf(out, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
 287                 ds = setting->setting;
 288                 if (ds->get)
 289                         out += sprintf(out, "r");
 290                 if (ds->set)
 291                         out += sprintf(out, "w");
 292                 out += sprintf(out, "\n");
 293         }
 294         len = out - page;
 295         mutex_unlock(&ide_setting_mtx);
 296         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 297 }
 298
 299 #define MAX_LEN 30
 300
 301 static int proc_ide_write_settings(struct file *file, const char __user *buffer,
 302                                    unsigned long count, void *data)
 303 {
 304         ide_drive_t     *drive = (ide_drive_t *) data;
 305         char            name[MAX_LEN + 1];
 306         int             for_real = 0, mul_factor, div_factor;
 307         unsigned long   n;
 308
 309         const struct ide_proc_devset *setting;
 310         char *buf, *s;
 311
 312         if (!capable(CAP_SYS_ADMIN))
 313                 return -EACCES;
 314
 315         proc_ide_settings_warn();
 316
 317         if (count >= PAGE_SIZE)
 318                 return -EINVAL;
 319
 320         s = buf = (char *)__get_free_page(GFP_USER);
 321         if (!buf)
 322                 return -ENOMEM;
 323
 324         if (copy_from_user(buf, buffer, count)) {
 325                 free_page((unsigned long)buf);
 326                 return -EFAULT;
 327         }
 328
 329         buf[count] = '\0';
 330
 331         /*
 332          * Skip over leading whitespace
 333          */
 334         while (count && isspace(*s)) {
 335                 --count;
 336                 ++s;
 337         }
 338         /*
 339          * Do one full pass to verify all parameters,
 340          * then do another to actually write the new settings.
 341          */
 342         do {
 343                 char *p = s;
 344                 n = count;
 345                 while (n > 0) {
 346                         unsigned val;
 347                         char *q = p;
 348
 349                         while (n > 0 && *p != ':') {
 350                                 --n;
 351                                 p++;
 352                         }
 353                         if (*p != ':')
 354                                 goto parse_error;
 355                         if (p - q > MAX_LEN)
 356                                 goto parse_error;
 357                         memcpy(name, q, p - q);
 358                         name[p - q] = 0;
 359
 360                         if (n > 0) {
 361                                 --n;
 362                                 p++;
 363                         } else
 364                                 goto parse_error;
 365
 366                         val = simple_strtoul(p, &q, 10);
 367                         n -= q - p;
 368                         p = q;
 369                         if (n > 0 && !isspace(*p))
 370                                 goto parse_error;
 371                         while (n > 0 && isspace(*p)) {
 372                                 --n;
 373                                 ++p;
 374                         }
 375
 376                         mutex_lock(&ide_setting_mtx);
 377                         /* generic settings first, then driver specific ones */
 378                         setting = ide_find_setting(ide_generic_settings, name);
 379                         if (!setting) {
 380                                 if (drive->settings)
 381                                         setting = ide_find_setting(drive->settings, name);
 382                                 if (!setting) {
 383                                         mutex_unlock(&ide_setting_mtx);
 384                                         goto parse_error;
 385                                 }
 386                         }
 387                         if (for_real) {
 388                                 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
 389                                 div_factor = setting->divf ? setting->divf(drive) : 1;
 390                                 ide_write_setting(drive, setting, val * div_factor / mul_factor);
 391                         }
 392                         mutex_unlock(&ide_setting_mtx);
 393                 }
 394         } while (!for_real++);
 395         free_page((unsigned long)buf);
 396         return count;
 397 parse_error:
 398         free_page((unsigned long)buf);
 399         printk("proc_ide_write_settings(): parse error\n");
 400         return -EINVAL;
 401 }
 402
 403 int proc_ide_read_capacity
 404         (char *page, char **start, off_t off, int count, int *eof, void *data)
 405 {
 406         int len = sprintf(page, "%llu\n", (long long)0x7fffffff);
 407         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 408 }
 409
 410 EXPORT_SYMBOL_GPL(proc_ide_read_capacity);
 411
 412 int proc_ide_read_geometry
 413         (char *page, char **start, off_t off, int count, int *eof, void *data)
 414 {
 415         ide_drive_t     *drive = (ide_drive_t *) data;
 416         char            *out = page;
 417         int             len;
 418
 419         out += sprintf(out, "physical     %d/%d/%d\n",
 420                         drive->cyl, drive->head, drive->sect);
 421         out += sprintf(out, "logical      %d/%d/%d\n",
 422                         drive->bios_cyl, drive->bios_head, drive->bios_sect);
 423
 424         len = out - page;
 425         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 426 }
 427
 428 EXPORT_SYMBOL(proc_ide_read_geometry);
 429
 430 static int proc_ide_read_dmodel
 431         (char *page, char **start, off_t off, int count, int *eof, void *data)
 432 {
 433         ide_drive_t     *drive = (ide_drive_t *) data;
 434         char            *m = (char *)&drive->id[ATA_ID_PROD];
 435         int             len;
 436
 437         len = sprintf(page, "%.40s\n", m[0] ? m : "(none)");
 438         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 439 }
 440
 441 static int proc_ide_read_driver
 442         (char *page, char **start, off_t off, int count, int *eof, void *data)
 443 {
 444         ide_drive_t     *drive = (ide_drive_t *) data;
 445         struct device   *dev = &drive->gendev;
 446         ide_driver_t    *ide_drv;
 447         int             len;
 448
 449         if (dev->driver) {
 450                 ide_drv = container_of(dev->driver, ide_driver_t, gen_driver);
 451                 len = sprintf(page, "%s version %s\n",
 452                                 dev->driver->name, ide_drv->version);
 453         } else
 454                 len = sprintf(page, "ide-default version 0.9.newide\n");
 455         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 456 }
 457
 458 static int ide_replace_subdriver(ide_drive_t *drive, const char *driver)
 459 {
 460         struct device *dev = &drive->gendev;
 461         int ret = 1;
 462         int err;
 463
 464         device_release_driver(dev);
 465         /* FIXME: device can still be in use by previous driver */
 466         strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
 467         err = device_attach(dev);
 468         if (err < 0)
 469                 printk(KERN_WARNING "IDE: %s: device_attach error: %d\n",
 470                         __func__, err);
 471         drive->driver_req[0] = 0;
 472         if (dev->driver == NULL) {
 473                 err = device_attach(dev);
 474                 if (err < 0)
 475                         printk(KERN_WARNING
 476                                 "IDE: %s: device_attach(2) error: %d\n",
 477                                 __func__, err);
 478         }
 479         if (dev->driver && !strcmp(dev->driver->name, driver))
 480                 ret = 0;
 481
 482         return ret;
 483 }
 484
 485 static int proc_ide_write_driver
 486         (struct file *file, const char __user *buffer, unsigned long count, void *data)
 487 {
 488         ide_drive_t     *drive = (ide_drive_t *) data;
 489         char name[32];
 490
 491         if (!capable(CAP_SYS_ADMIN))
 492                 return -EACCES;
 493         if (count > 31)
 494                 count = 31;
 495         if (copy_from_user(name, buffer, count))
 496                 return -EFAULT;
 497         name[count] = '\0';
 498         if (ide_replace_subdriver(drive, name))
 499                 return -EINVAL;
 500         return count;
 501 }
 502
 503 static int proc_ide_read_media
 504         (char *page, char **start, off_t off, int count, int *eof, void *data)
 505 {
 506         ide_drive_t     *drive = (ide_drive_t *) data;
 507         const char      *media;
 508         int             len;
 509
 510         switch (drive->media) {
 511         case ide_disk:          media = "disk\n";       break;
 512         case ide_cdrom:         media = "cdrom\n";      break;
 513         case ide_tape:          media = "tape\n";       break;
 514         case ide_floppy:        media = "floppy\n";     break;
 515         case ide_optical:       media = "optical\n";    break;
 516         default:                media = "UNKNOWN\n";    break;
 517         }
 518         strcpy(page, media);
 519         len = strlen(media);
 520         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 521 }
 522
 523 static ide_proc_entry_t generic_drive_entries[] = {
 524         { "driver",     S_IFREG|S_IRUGO,         proc_ide_read_driver,
 525                                                  proc_ide_write_driver },
 526         { "identify",   S_IFREG|S_IRUSR,         proc_ide_read_identify, NULL },
 527         { "media",      S_IFREG|S_IRUGO,         proc_ide_read_media,    NULL },
 528         { "model",      S_IFREG|S_IRUGO,         proc_ide_read_dmodel,   NULL },
 529         { "settings",   S_IFREG|S_IRUSR|S_IWUSR, proc_ide_read_settings,
 530                                                  proc_ide_write_settings },
 531         { NULL, 0, NULL, NULL }
 532 };
 533
 534 static void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
 535 {
 536         struct proc_dir_entry *ent;
 537
 538         if (!dir || !p)
 539                 return;
 540         while (p->name != NULL) {
 541                 ent = create_proc_entry(p->name, p->mode, dir);
 542                 if (!ent) return;
 543                 ent->data = data;
 544                 ent->read_proc = p->read_proc;
 545                 ent->write_proc = p->write_proc;
 546                 p++;
 547         }
 548 }
 549
 550 static void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
 551 {
 552         if (!dir || !p)
 553                 return;
 554         while (p->name != NULL) {
 555                 remove_proc_entry(p->name, dir);
 556                 p++;
 557         }
 558 }
 559
 560 void ide_proc_register_driver(ide_drive_t *drive, ide_driver_t *driver)
 561 {
 562         mutex_lock(&ide_setting_mtx);
 563         drive->settings = driver->proc_devsets(drive);
 564         mutex_unlock(&ide_setting_mtx);
 565
 566         ide_add_proc_entries(drive->proc, driver->proc_entries(drive), drive);
 567 }
 568
 569 EXPORT_SYMBOL(ide_proc_register_driver);
 570
 571 /**
 572  *      ide_proc_unregister_driver      -       remove driver specific data
 573  *      @drive: drive
 574  *      @driver: driver
 575  *
 576  *      Clean up the driver specific /proc files and IDE settings
 577  *      for a given drive.
 578  *
 579  *      Takes ide_setting_mtx.
 580  */
 581
 582 void ide_proc_unregister_driver(ide_drive_t *drive, ide_driver_t *driver)
 583 {
 584         ide_remove_proc_entries(drive->proc, driver->proc_entries(drive));
 585
 586         mutex_lock(&ide_setting_mtx);
 587         /*
 588          * ide_setting_mtx protects both the settings list and the use
 589          * of settings (we cannot take a setting out that is being used).
 590          */
 591         drive->settings = NULL;
 592         mutex_unlock(&ide_setting_mtx);
 593 }
 594 EXPORT_SYMBOL(ide_proc_unregister_driver);
 595
 596 void ide_proc_port_register_devices(ide_hwif_t *hwif)
 597 {
 598         int     d;
 599         struct proc_dir_entry *ent;
 600         struct proc_dir_entry *parent = hwif->proc;
 601         char name[64];
 602
 603         for (d = 0; d < MAX_DRIVES; d++) {
 604                 ide_drive_t *drive = &hwif->drives[d];
 605
 606                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0 || drive->proc)
 607                         continue;
 608
 609                 drive->proc = proc_mkdir(drive->name, parent);
 610                 if (drive->proc)
 611                         ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
 612                 sprintf(name, "ide%d/%s", (drive->name[2]-'a')/2, drive->name);
 613                 ent = proc_symlink(drive->name, proc_ide_root, name);
 614                 if (!ent) return;
 615         }
 616 }
 617
 618 void ide_proc_unregister_device(ide_drive_t *drive)
 619 {
 620         if (drive->proc) {
 621                 ide_remove_proc_entries(drive->proc, generic_drive_entries);
 622                 remove_proc_entry(drive->name, proc_ide_root);
 623                 remove_proc_entry(drive->name, drive->hwif->proc);
 624                 drive->proc = NULL;
 625         }
 626 }
 627
 628 static ide_proc_entry_t hwif_entries[] = {
 629         { "channel",    S_IFREG|S_IRUGO,        proc_ide_read_channel,  NULL },
 630         { "mate",       S_IFREG|S_IRUGO,        proc_ide_read_mate,     NULL },
 631         { "model",      S_IFREG|S_IRUGO,        proc_ide_read_imodel,   NULL },
 632         { NULL, 0, NULL, NULL }
 633 };
 634
 635 void ide_proc_register_port(ide_hwif_t *hwif)
 636 {
 637         if (!hwif->proc) {
 638                 hwif->proc = proc_mkdir(hwif->name, proc_ide_root);
 639
 640                 if (!hwif->proc)
 641                         return;
 642
 643                 ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
 644         }
 645 }
 646
 647 void ide_proc_unregister_port(ide_hwif_t *hwif)
 648 {
 649         if (hwif->proc) {
 650                 ide_remove_proc_entries(hwif->proc, hwif_entries);
 651                 remove_proc_entry(hwif->name, proc_ide_root);
 652                 hwif->proc = NULL;
 653         }
 654 }
 655
 656 static int proc_print_driver(struct device_driver *drv, void *data)
 657 {
 658         ide_driver_t *ide_drv = container_of(drv, ide_driver_t, gen_driver);
 659         struct seq_file *s = data;
 660
 661         seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);
 662
 663         return 0;
 664 }
 665
 666 static int ide_drivers_show(struct seq_file *s, void *p)
 667 {
 668         int err;
 669
 670         err = bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
 671         if (err < 0)
 672                 printk(KERN_WARNING "IDE: %s: bus_for_each_drv error: %d\n",
 673                         __func__, err);
 674         return 0;
 675 }
 676
 677 static int ide_drivers_open(struct inode *inode, struct file *file)
 678 {
 679         return single_open(file, &ide_drivers_show, NULL);
 680 }
 681
 682 static const struct file_operations ide_drivers_operations = {
 683         .owner          = THIS_MODULE,
 684         .open           = ide_drivers_open,
 685         .read           = seq_read,
 686         .llseek         = seq_lseek,
 687         .release        = single_release,
 688 };
 689
 690 void proc_ide_create(void)
 691 {
 692         proc_ide_root = proc_mkdir("ide", NULL);
 693
 694         if (!proc_ide_root)
 695                 return;
 696
 697         proc_create("drivers", 0, proc_ide_root, &ide_drivers_operations);
 698 }
 699
 700 void proc_ide_destroy(void)
 701 {
 702         remove_proc_entry("drivers", proc_ide_root);
 703         remove_proc_entry("ide", NULL);
 704 }