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_cy82c693:      name = "cy82c693";      break;
  50         case ide_4drives:       name = "4drives";       break;
  51         case ide_pmac:          name = "mac-io";        break;
  52         case ide_au1xxx:        name = "au1xxx";        break;
  53         case ide_palm3710:      name = "palm3710";      break;
  54         case ide_acorn:         name = "acorn";         break;
  55         default:                name = "(unknown)";     break;
  56         }
  57         len = sprintf(page, "%s\n", name);
  58         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  59 }
  60
  61 static int proc_ide_read_mate
  62         (char *page, char **start, off_t off, int count, int *eof, void *data)
  63 {
  64         ide_hwif_t      *hwif = (ide_hwif_t *) data;
  65         int             len;
  66
  67         if (hwif && hwif->mate)
  68                 len = sprintf(page, "%s\n", hwif->mate->name);
  69         else
  70                 len = sprintf(page, "(none)\n");
  71         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  72 }
  73
  74 static int proc_ide_read_channel
  75         (char *page, char **start, off_t off, int count, int *eof, void *data)
  76 {
  77         ide_hwif_t      *hwif = (ide_hwif_t *) data;
  78         int             len;
  79
  80         page[0] = hwif->channel ? '1' : '0';
  81         page[1] = '\n';
  82         len = 2;
  83         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  84 }
  85
  86 static int proc_ide_read_identify
  87         (char *page, char **start, off_t off, int count, int *eof, void *data)
  88 {
  89         ide_drive_t     *drive = (ide_drive_t *)data;
  90         int             len = 0, i = 0;
  91         int             err = 0;
  92
  93         len = sprintf(page, "\n");
  94
  95         if (drive) {
  96                 __le16 *val = (__le16 *)page;
  97
  98                 err = taskfile_lib_get_identify(drive, page);
  99                 if (!err) {
 100                         char *out = (char *)page + SECTOR_SIZE;
 101
 102                         page = out;
 103                         do {
 104                                 out += sprintf(out, "%04x%c",
 105                                         le16_to_cpup(val), (++i & 7) ? ' ' : '\n');
 106                                 val += 1;
 107                         } while (i < SECTOR_SIZE / 2);
 108                         len = out - page;
 109                 }
 110         }
 111         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 112 }
 113
 114 /**
 115  *      ide_find_setting        -       find a specific setting
 116  *      @st: setting table pointer
 117  *      @name: setting name
 118  *
 119  *      Scan's the setting table for a matching entry and returns
 120  *      this or NULL if no entry is found. The caller must hold the
 121  *      setting semaphore
 122  */
 123
 124 static
 125 const struct ide_proc_devset *ide_find_setting(const struct ide_proc_devset *st,
 126                                                char *name)
 127 {
 128         while (st->name) {
 129                 if (strcmp(st->name, name) == 0)
 130                         break;
 131                 st++;
 132         }
 133         return st->name ? st : NULL;
 134 }
 135
 136 /**
 137  *      ide_read_setting        -       read an IDE setting
 138  *      @drive: drive to read from
 139  *      @setting: drive setting
 140  *
 141  *      Read a drive setting and return the value. The caller
 142  *      must hold the ide_setting_mtx when making this call.
 143  *
 144  *      BUGS: the data return and error are the same return value
 145  *      so an error -EINVAL and true return of the same value cannot
 146  *      be told apart
 147  */
 148
 149 static int ide_read_setting(ide_drive_t *drive,
 150                             const struct ide_proc_devset *setting)
 151 {
 152         const struct ide_devset *ds = setting->setting;
 153         int val = -EINVAL;
 154
 155         if (ds->get)
 156                 val = ds->get(drive);
 157
 158         return val;
 159 }
 160
 161 /**
 162  *      ide_write_setting       -       read an IDE setting
 163  *      @drive: drive to read from
 164  *      @setting: drive setting
 165  *      @val: value
 166  *
 167  *      Write a drive setting if it is possible. The caller
 168  *      must hold the ide_setting_mtx when making this call.
 169  *
 170  *      BUGS: the data return and error are the same return value
 171  *      so an error -EINVAL and true return of the same value cannot
 172  *      be told apart
 173  *
 174  *      FIXME:  This should be changed to enqueue a special request
 175  *      to the driver to change settings, and then wait on a sema for completion.
 176  *      The current scheme of polling is kludgy, though safe enough.
 177  */
 178
 179 static int ide_write_setting(ide_drive_t *drive,
 180                              const struct ide_proc_devset *setting, int val)
 181 {
 182         const struct ide_devset *ds = setting->setting;
 183
 184         if (!capable(CAP_SYS_ADMIN))
 185                 return -EACCES;
 186         if (!ds->set)
 187                 return -EPERM;
 188         if ((ds->flags & DS_SYNC)
 189             && (val < setting->min || val > setting->max))
 190                 return -EINVAL;
 191         return ide_devset_execute(drive, ds, val);
 192 }
 193
 194 ide_devset_get(xfer_rate, current_speed);
 195
 196 static int set_xfer_rate (ide_drive_t *drive, int arg)
 197 {
 198         ide_task_t task;
 199         int err;
 200
 201         if (arg < XFER_PIO_0 || arg > XFER_UDMA_6)
 202                 return -EINVAL;
 203
 204         memset(&task, 0, sizeof(task));
 205         task.tf.command = ATA_CMD_SET_FEATURES;
 206         task.tf.feature = SETFEATURES_XFER;
 207         task.tf.nsect   = (u8)arg;
 208         task.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT |
 209                         IDE_TFLAG_IN_NSECT;
 210
 211         err = ide_no_data_taskfile(drive, &task);
 212
 213         if (!err) {
 214                 ide_set_xfer_rate(drive, (u8) arg);
 215                 ide_driveid_update(drive);
 216         }
 217         return err;
 218 }
 219
 220 ide_devset_rw(current_speed, xfer_rate);
 221 ide_devset_rw_field(init_speed, init_speed);
 222 ide_devset_rw_flag(nice1, IDE_DFLAG_NICE1);
 223 ide_devset_rw_field(number, dn);
 224
 225 static const struct ide_proc_devset ide_generic_settings[] = {
 226         IDE_PROC_DEVSET(current_speed, 0, 70),
 227         IDE_PROC_DEVSET(init_speed, 0, 70),
 228         IDE_PROC_DEVSET(io_32bit,  0, 1 + (SUPPORT_VLB_SYNC << 1)),
 229         IDE_PROC_DEVSET(keepsettings, 0, 1),
 230         IDE_PROC_DEVSET(nice1, 0, 1),
 231         IDE_PROC_DEVSET(number, 0, 3),
 232         IDE_PROC_DEVSET(pio_mode, 0, 255),
 233         IDE_PROC_DEVSET(unmaskirq, 0, 1),
 234         IDE_PROC_DEVSET(using_dma, 0, 1),
 235         { 0 },
 236 };
 237
 238 static void proc_ide_settings_warn(void)
 239 {
 240         static int warned;
 241
 242         if (warned)
 243                 return;
 244
 245         printk(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "
 246                             "obsolete, and will be removed soon!\n");
 247         warned = 1;
 248 }
 249
 250 static int proc_ide_read_settings
 251         (char *page, char **start, off_t off, int count, int *eof, void *data)
 252 {
 253         const struct ide_proc_devset *setting, *g, *d;
 254         const struct ide_devset *ds;
 255         ide_drive_t     *drive = (ide_drive_t *) data;
 256         char            *out = page;
 257         int             len, rc, mul_factor, div_factor;
 258
 259         proc_ide_settings_warn();
 260
 261         mutex_lock(&ide_setting_mtx);
 262         g = ide_generic_settings;
 263         d = drive->settings;
 264         out += sprintf(out, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
 265         out += sprintf(out, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
 266         while (g->name || (d && d->name)) {
 267                 /* read settings in the alphabetical order */
 268                 if (g->name && d && d->name) {
 269                         if (strcmp(d->name, g->name) < 0)
 270                                 setting = d++;
 271                         else
 272                                 setting = g++;
 273                 } else if (d && d->name) {
 274                         setting = d++;
 275                 } else
 276                         setting = g++;
 277                 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
 278                 div_factor = setting->divf ? setting->divf(drive) : 1;
 279                 out += sprintf(out, "%-24s", setting->name);
 280                 rc = ide_read_setting(drive, setting);
 281                 if (rc >= 0)
 282                         out += sprintf(out, "%-16d", rc * mul_factor / div_factor);
 283                 else
 284                         out += sprintf(out, "%-16s", "write-only");
 285                 out += sprintf(out, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
 286                 ds = setting->setting;
 287                 if (ds->get)
 288                         out += sprintf(out, "r");
 289                 if (ds->set)
 290                         out += sprintf(out, "w");
 291                 out += sprintf(out, "\n");
 292         }
 293         len = out - page;
 294         mutex_unlock(&ide_setting_mtx);
 295         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 296 }
 297
 298 #define MAX_LEN 30
 299
 300 static int proc_ide_write_settings(struct file *file, const char __user *buffer,
 301                                    unsigned long count, void *data)
 302 {
 303         ide_drive_t     *drive = (ide_drive_t *) data;
 304         char            name[MAX_LEN + 1];
 305         int             for_real = 0, mul_factor, div_factor;
 306         unsigned long   n;
 307
 308         const struct ide_proc_devset *setting;
 309         char *buf, *s;
 310
 311         if (!capable(CAP_SYS_ADMIN))
 312                 return -EACCES;
 313
 314         proc_ide_settings_warn();
 315
 316         if (count >= PAGE_SIZE)
 317                 return -EINVAL;
 318
 319         s = buf = (char *)__get_free_page(GFP_USER);
 320         if (!buf)
 321                 return -ENOMEM;
 322
 323         if (copy_from_user(buf, buffer, count)) {
 324                 free_page((unsigned long)buf);
 325                 return -EFAULT;
 326         }
 327
 328         buf[count] = '\0';
 329
 330         /*
 331          * Skip over leading whitespace
 332          */
 333         while (count && isspace(*s)) {
 334                 --count;
 335                 ++s;
 336         }
 337         /*
 338          * Do one full pass to verify all parameters,
 339          * then do another to actually write the new settings.
 340          */
 341         do {
 342                 char *p = s;
 343                 n = count;
 344                 while (n > 0) {
 345                         unsigned val;
 346                         char *q = p;
 347
 348                         while (n > 0 && *p != ':') {
 349                                 --n;
 350                                 p++;
 351                         }
 352                         if (*p != ':')
 353                                 goto parse_error;
 354                         if (p - q > MAX_LEN)
 355                                 goto parse_error;
 356                         memcpy(name, q, p - q);
 357                         name[p - q] = 0;
 358
 359                         if (n > 0) {
 360                                 --n;
 361                                 p++;
 362                         } else
 363                                 goto parse_error;
 364
 365                         val = simple_strtoul(p, &q, 10);
 366                         n -= q - p;
 367                         p = q;
 368                         if (n > 0 && !isspace(*p))
 369                                 goto parse_error;
 370                         while (n > 0 && isspace(*p)) {
 371                                 --n;
 372                                 ++p;
 373                         }
 374
 375                         mutex_lock(&ide_setting_mtx);
 376                         /* generic settings first, then driver specific ones */
 377                         setting = ide_find_setting(ide_generic_settings, name);
 378                         if (!setting) {
 379                                 if (drive->settings)
 380                                         setting = ide_find_setting(drive->settings, name);
 381                                 if (!setting) {
 382                                         mutex_unlock(&ide_setting_mtx);
 383                                         goto parse_error;
 384                                 }
 385                         }
 386                         if (for_real) {
 387                                 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
 388                                 div_factor = setting->divf ? setting->divf(drive) : 1;
 389                                 ide_write_setting(drive, setting, val * div_factor / mul_factor);
 390                         }
 391                         mutex_unlock(&ide_setting_mtx);
 392                 }
 393         } while (!for_real++);
 394         free_page((unsigned long)buf);
 395         return count;
 396 parse_error:
 397         free_page((unsigned long)buf);
 398         printk("proc_ide_write_settings(): parse error\n");
 399         return -EINVAL;
 400 }
 401
 402 int proc_ide_read_capacity
 403         (char *page, char **start, off_t off, int count, int *eof, void *data)
 404 {
 405         int len = sprintf(page, "%llu\n", (long long)0x7fffffff);
 406         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 407 }
 408
 409 EXPORT_SYMBOL_GPL(proc_ide_read_capacity);
 410
 411 int proc_ide_read_geometry
 412         (char *page, char **start, off_t off, int count, int *eof, void *data)
 413 {
 414         ide_drive_t     *drive = (ide_drive_t *) data;
 415         char            *out = page;
 416         int             len;
 417
 418         out += sprintf(out, "physical     %d/%d/%d\n",
 419                         drive->cyl, drive->head, drive->sect);
 420         out += sprintf(out, "logical      %d/%d/%d\n",
 421                         drive->bios_cyl, drive->bios_head, drive->bios_sect);
 422
 423         len = out - page;
 424         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 425 }
 426
 427 EXPORT_SYMBOL(proc_ide_read_geometry);
 428
 429 static int proc_ide_read_dmodel
 430         (char *page, char **start, off_t off, int count, int *eof, void *data)
 431 {
 432         ide_drive_t     *drive = (ide_drive_t *) data;
 433         char            *m = (char *)&drive->id[ATA_ID_PROD];
 434         int             len;
 435
 436         len = sprintf(page, "%.40s\n", m[0] ? m : "(none)");
 437         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 438 }
 439
 440 static int proc_ide_read_driver
 441         (char *page, char **start, off_t off, int count, int *eof, void *data)
 442 {
 443         ide_drive_t     *drive = (ide_drive_t *) data;
 444         struct device   *dev = &drive->gendev;
 445         ide_driver_t    *ide_drv;
 446         int             len;
 447
 448         if (dev->driver) {
 449                 ide_drv = container_of(dev->driver, ide_driver_t, gen_driver);
 450                 len = sprintf(page, "%s version %s\n",
 451                                 dev->driver->name, ide_drv->version);
 452         } else
 453                 len = sprintf(page, "ide-default version 0.9.newide\n");
 454         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 455 }
 456
 457 static int ide_replace_subdriver(ide_drive_t *drive, const char *driver)
 458 {
 459         struct device *dev = &drive->gendev;
 460         int ret = 1;
 461         int err;
 462
 463         device_release_driver(dev);
 464         /* FIXME: device can still be in use by previous driver */
 465         strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
 466         err = device_attach(dev);
 467         if (err < 0)
 468                 printk(KERN_WARNING "IDE: %s: device_attach error: %d\n",
 469                         __func__, err);
 470         drive->driver_req[0] = 0;
 471         if (dev->driver == NULL) {
 472                 err = device_attach(dev);
 473                 if (err < 0)
 474                         printk(KERN_WARNING
 475                                 "IDE: %s: device_attach(2) error: %d\n",
 476                                 __func__, err);
 477         }
 478         if (dev->driver && !strcmp(dev->driver->name, driver))
 479                 ret = 0;
 480
 481         return ret;
 482 }
 483
 484 static int proc_ide_write_driver
 485         (struct file *file, const char __user *buffer, unsigned long count, void *data)
 486 {
 487         ide_drive_t     *drive = (ide_drive_t *) data;
 488         char name[32];
 489
 490         if (!capable(CAP_SYS_ADMIN))
 491                 return -EACCES;
 492         if (count > 31)
 493                 count = 31;
 494         if (copy_from_user(name, buffer, count))
 495                 return -EFAULT;
 496         name[count] = '\0';
 497         if (ide_replace_subdriver(drive, name))
 498                 return -EINVAL;
 499         return count;
 500 }
 501
 502 static int proc_ide_read_media
 503         (char *page, char **start, off_t off, int count, int *eof, void *data)
 504 {
 505         ide_drive_t     *drive = (ide_drive_t *) data;
 506         const char      *media;
 507         int             len;
 508
 509         switch (drive->media) {
 510         case ide_disk:          media = "disk\n";       break;
 511         case ide_cdrom:         media = "cdrom\n";      break;
 512         case ide_tape:          media = "tape\n";       break;
 513         case ide_floppy:        media = "floppy\n";     break;
 514         case ide_optical:       media = "optical\n";    break;
 515         default:                media = "UNKNOWN\n";    break;
 516         }
 517         strcpy(page, media);
 518         len = strlen(media);
 519         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 520 }
 521
 522 static ide_proc_entry_t generic_drive_entries[] = {
 523         { "driver",     S_IFREG|S_IRUGO,         proc_ide_read_driver,
 524                                                  proc_ide_write_driver },
 525         { "identify",   S_IFREG|S_IRUSR,         proc_ide_read_identify, NULL },
 526         { "media",      S_IFREG|S_IRUGO,         proc_ide_read_media,    NULL },
 527         { "model",      S_IFREG|S_IRUGO,         proc_ide_read_dmodel,   NULL },
 528         { "settings",   S_IFREG|S_IRUSR|S_IWUSR, proc_ide_read_settings,
 529                                                  proc_ide_write_settings },
 530         { NULL, 0, NULL, NULL }
 531 };
 532
 533 static void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
 534 {
 535         struct proc_dir_entry *ent;
 536
 537         if (!dir || !p)
 538                 return;
 539         while (p->name != NULL) {
 540                 ent = create_proc_entry(p->name, p->mode, dir);
 541                 if (!ent) return;
 542                 ent->data = data;
 543                 ent->read_proc = p->read_proc;
 544                 ent->write_proc = p->write_proc;
 545                 p++;
 546         }
 547 }
 548
 549 static void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
 550 {
 551         if (!dir || !p)
 552                 return;
 553         while (p->name != NULL) {
 554                 remove_proc_entry(p->name, dir);
 555                 p++;
 556         }
 557 }
 558
 559 void ide_proc_register_driver(ide_drive_t *drive, ide_driver_t *driver)
 560 {
 561         mutex_lock(&ide_setting_mtx);
 562         drive->settings = driver->proc_devsets(drive);
 563         mutex_unlock(&ide_setting_mtx);
 564
 565         ide_add_proc_entries(drive->proc, driver->proc_entries(drive), drive);
 566 }
 567
 568 EXPORT_SYMBOL(ide_proc_register_driver);
 569
 570 /**
 571  *      ide_proc_unregister_driver      -       remove driver specific data
 572  *      @drive: drive
 573  *      @driver: driver
 574  *
 575  *      Clean up the driver specific /proc files and IDE settings
 576  *      for a given drive.
 577  *
 578  *      Takes ide_setting_mtx.
 579  */
 580
 581 void ide_proc_unregister_driver(ide_drive_t *drive, ide_driver_t *driver)
 582 {
 583         ide_remove_proc_entries(drive->proc, driver->proc_entries(drive));
 584
 585         mutex_lock(&ide_setting_mtx);
 586         /*
 587          * ide_setting_mtx protects both the settings list and the use
 588          * of settings (we cannot take a setting out that is being used).
 589          */
 590         drive->settings = NULL;
 591         mutex_unlock(&ide_setting_mtx);
 592 }
 593 EXPORT_SYMBOL(ide_proc_unregister_driver);
 594
 595 void ide_proc_port_register_devices(ide_hwif_t *hwif)
 596 {
 597         int     d;
 598         struct proc_dir_entry *ent;
 599         struct proc_dir_entry *parent = hwif->proc;
 600         char name[64];
 601
 602         for (d = 0; d < MAX_DRIVES; d++) {
 603                 ide_drive_t *drive = &hwif->drives[d];
 604
 605                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0 || drive->proc)
 606                         continue;
 607
 608                 drive->proc = proc_mkdir(drive->name, parent);
 609                 if (drive->proc)
 610                         ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
 611                 sprintf(name, "ide%d/%s", (drive->name[2]-'a')/2, drive->name);
 612                 ent = proc_symlink(drive->name, proc_ide_root, name);
 613                 if (!ent) return;
 614         }
 615 }
 616
 617 void ide_proc_unregister_device(ide_drive_t *drive)
 618 {
 619         if (drive->proc) {
 620                 ide_remove_proc_entries(drive->proc, generic_drive_entries);
 621                 remove_proc_entry(drive->name, proc_ide_root);
 622                 remove_proc_entry(drive->name, drive->hwif->proc);
 623                 drive->proc = NULL;
 624         }
 625 }
 626
 627 static ide_proc_entry_t hwif_entries[] = {
 628         { "channel",    S_IFREG|S_IRUGO,        proc_ide_read_channel,  NULL },
 629         { "mate",       S_IFREG|S_IRUGO,        proc_ide_read_mate,     NULL },
 630         { "model",      S_IFREG|S_IRUGO,        proc_ide_read_imodel,   NULL },
 631         { NULL, 0, NULL, NULL }
 632 };
 633
 634 void ide_proc_register_port(ide_hwif_t *hwif)
 635 {
 636         if (!hwif->proc) {
 637                 hwif->proc = proc_mkdir(hwif->name, proc_ide_root);
 638
 639                 if (!hwif->proc)
 640                         return;
 641
 642                 ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
 643         }
 644 }
 645
 646 void ide_proc_unregister_port(ide_hwif_t *hwif)
 647 {
 648         if (hwif->proc) {
 649                 ide_remove_proc_entries(hwif->proc, hwif_entries);
 650                 remove_proc_entry(hwif->name, proc_ide_root);
 651                 hwif->proc = NULL;
 652         }
 653 }
 654
 655 static int proc_print_driver(struct device_driver *drv, void *data)
 656 {
 657         ide_driver_t *ide_drv = container_of(drv, ide_driver_t, gen_driver);
 658         struct seq_file *s = data;
 659
 660         seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);
 661
 662         return 0;
 663 }
 664
 665 static int ide_drivers_show(struct seq_file *s, void *p)
 666 {
 667         int err;
 668
 669         err = bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
 670         if (err < 0)
 671                 printk(KERN_WARNING "IDE: %s: bus_for_each_drv error: %d\n",
 672                         __func__, err);
 673         return 0;
 674 }
 675
 676 static int ide_drivers_open(struct inode *inode, struct file *file)
 677 {
 678         return single_open(file, &ide_drivers_show, NULL);
 679 }
 680
 681 static const struct file_operations ide_drivers_operations = {
 682         .owner          = THIS_MODULE,
 683         .open           = ide_drivers_open,
 684         .read           = seq_read,
 685         .llseek         = seq_lseek,
 686         .release        = single_release,
 687 };
 688
 689 void proc_ide_create(void)
 690 {
 691         proc_ide_root = proc_mkdir("ide", NULL);
 692
 693         if (!proc_ide_root)
 694                 return;
 695
 696         proc_create("drivers", 0, proc_ide_root, &ide_drivers_operations);
 697 }
 698
 699 void proc_ide_destroy(void)
 700 {
 701         remove_proc_entry("drivers", proc_ide_root);
 702         remove_proc_entry("ide", NULL);
 703 }