git.oblomov.eu Git - 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_rz1000:        name = "rz1000";        break;
  50         case ide_trm290:        name = "trm290";        break;
  51         case ide_cy82c693:      name = "cy82c693";      break;
  52         case ide_4drives:       name = "4drives";       break;
  53         case ide_pmac:          name = "mac-io";        break;
  54         case ide_au1xxx:        name = "au1xxx";        break;
  55         case ide_palm3710:      name = "palm3710";      break;
  56         case ide_acorn:         name = "acorn";         break;
  57         default:                name = "(unknown)";     break;
  58         }
  59         len = sprintf(page, "%s\n", name);
  60         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  61 }
  62
  63 static int proc_ide_read_mate
  64         (char *page, char **start, off_t off, int count, int *eof, void *data)
  65 {
  66         ide_hwif_t      *hwif = (ide_hwif_t *) data;
  67         int             len;
  68
  69         if (hwif && hwif->mate)
  70                 len = sprintf(page, "%s\n", hwif->mate->name);
  71         else
  72                 len = sprintf(page, "(none)\n");
  73         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  74 }
  75
  76 static int proc_ide_read_channel
  77         (char *page, char **start, off_t off, int count, int *eof, void *data)
  78 {
  79         ide_hwif_t      *hwif = (ide_hwif_t *) data;
  80         int             len;
  81
  82         page[0] = hwif->channel ? '1' : '0';
  83         page[1] = '\n';
  84         len = 2;
  85         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  86 }
  87
  88 static int proc_ide_read_identify
  89         (char *page, char **start, off_t off, int count, int *eof, void *data)
  90 {
  91         ide_drive_t     *drive = (ide_drive_t *)data;
  92         int             len = 0, i = 0;
  93         int             err = 0;
  94
  95         len = sprintf(page, "\n");
  96
  97         if (drive) {
  98                 __le16 *val = (__le16 *)page;
  99
 100                 err = taskfile_lib_get_identify(drive, page);
 101                 if (!err) {
 102                         char *out = (char *)page + SECTOR_SIZE;
 103
 104                         page = out;
 105                         do {
 106                                 out += sprintf(out, "%04x%c",
 107                                         le16_to_cpup(val), (++i & 7) ? ' ' : '\n');
 108                                 val += 1;
 109                         } while (i < SECTOR_SIZE / 2);
 110                         len = out - page;
 111                 }
 112         }
 113         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 114 }
 115
 116 /**
 117  *      ide_find_setting        -       find a specific setting
 118  *      @st: setting table pointer
 119  *      @name: setting name
 120  *
 121  *      Scan's the setting table for a matching entry and returns
 122  *      this or NULL if no entry is found. The caller must hold the
 123  *      setting semaphore
 124  */
 125
 126 static
 127 const struct ide_proc_devset *ide_find_setting(const struct ide_proc_devset *st,
 128                                                char *name)
 129 {
 130         while (st->name) {
 131                 if (strcmp(st->name, name) == 0)
 132                         break;
 133                 st++;
 134         }
 135         return st->name ? st : NULL;
 136 }
 137
 138 /**
 139  *      ide_read_setting        -       read an IDE setting
 140  *      @drive: drive to read from
 141  *      @setting: drive setting
 142  *
 143  *      Read a drive setting and return the value. The caller
 144  *      must hold the ide_setting_mtx when making this call.
 145  *
 146  *      BUGS: the data return and error are the same return value
 147  *      so an error -EINVAL and true return of the same value cannot
 148  *      be told apart
 149  */
 150
 151 static int ide_read_setting(ide_drive_t *drive,
 152                             const struct ide_proc_devset *setting)
 153 {
 154         const struct ide_devset *ds = setting->setting;
 155         int val = -EINVAL;
 156
 157         if (ds->get)
 158                 val = ds->get(drive);
 159
 160         return val;
 161 }
 162
 163 /**
 164  *      ide_write_setting       -       read an IDE setting
 165  *      @drive: drive to read from
 166  *      @setting: drive setting
 167  *      @val: value
 168  *
 169  *      Write a drive setting if it is possible. The caller
 170  *      must hold the ide_setting_mtx when making this call.
 171  *
 172  *      BUGS: the data return and error are the same return value
 173  *      so an error -EINVAL and true return of the same value cannot
 174  *      be told apart
 175  *
 176  *      FIXME:  This should be changed to enqueue a special request
 177  *      to the driver to change settings, and then wait on a sema for completion.
 178  *      The current scheme of polling is kludgy, though safe enough.
 179  */
 180
 181 static int ide_write_setting(ide_drive_t *drive,
 182                              const struct ide_proc_devset *setting, int val)
 183 {
 184         const struct ide_devset *ds = setting->setting;
 185
 186         if (!capable(CAP_SYS_ADMIN))
 187                 return -EACCES;
 188         if (!ds->set)
 189                 return -EPERM;
 190         if ((ds->flags & DS_SYNC)
 191             && (val < setting->min || val > setting->max))
 192                 return -EINVAL;
 193         return ide_devset_execute(drive, ds, val);
 194 }
 195
 196 ide_devset_get(xfer_rate, current_speed);
 197
 198 static int set_xfer_rate (ide_drive_t *drive, int arg)
 199 {
 200         ide_task_t task;
 201         int err;
 202
 203         if (arg < XFER_PIO_0 || arg > XFER_UDMA_6)
 204                 return -EINVAL;
 205
 206         memset(&task, 0, sizeof(task));
 207         task.tf.command = ATA_CMD_SET_FEATURES;
 208         task.tf.feature = SETFEATURES_XFER;
 209         task.tf.nsect   = (u8)arg;
 210         task.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT |
 211                         IDE_TFLAG_IN_NSECT;
 212
 213         err = ide_no_data_taskfile(drive, &task);
 214
 215         if (!err) {
 216                 ide_set_xfer_rate(drive, (u8) arg);
 217                 ide_driveid_update(drive);
 218         }
 219         return err;
 220 }
 221
 222 ide_devset_rw(current_speed, xfer_rate);
 223 ide_devset_rw_field(init_speed, init_speed);
 224 ide_devset_rw_flag(nice1, IDE_DFLAG_NICE1);
 225 ide_devset_rw_field(number, dn);
 226
 227 static const struct ide_proc_devset ide_generic_settings[] = {
 228         IDE_PROC_DEVSET(current_speed, 0, 70),
 229         IDE_PROC_DEVSET(init_speed, 0, 70),
 230         IDE_PROC_DEVSET(io_32bit,  0, 1 + (SUPPORT_VLB_SYNC << 1)),
 231         IDE_PROC_DEVSET(keepsettings, 0, 1),
 232         IDE_PROC_DEVSET(nice1, 0, 1),
 233         IDE_PROC_DEVSET(number, 0, 3),
 234         IDE_PROC_DEVSET(pio_mode, 0, 255),
 235         IDE_PROC_DEVSET(unmaskirq, 0, 1),
 236         IDE_PROC_DEVSET(using_dma, 0, 1),
 237         { 0 },
 238 };
 239
 240 static void proc_ide_settings_warn(void)
 241 {
 242         static int warned;
 243
 244         if (warned)
 245                 return;
 246
 247         printk(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "
 248                             "obsolete, and will be removed soon!\n");
 249         warned = 1;
 250 }
 251
 252 static int proc_ide_read_settings
 253         (char *page, char **start, off_t off, int count, int *eof, void *data)
 254 {
 255         const struct ide_proc_devset *setting, *g, *d;
 256         const struct ide_devset *ds;
 257         ide_drive_t     *drive = (ide_drive_t *) data;
 258         char            *out = page;
 259         int             len, rc, mul_factor, div_factor;
 260
 261         proc_ide_settings_warn();
 262
 263         mutex_lock(&ide_setting_mtx);
 264         g = ide_generic_settings;
 265         d = drive->settings;
 266         out += sprintf(out, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
 267         out += sprintf(out, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
 268         while (g->name || (d && d->name)) {
 269                 /* read settings in the alphabetical order */
 270                 if (g->name && d && d->name) {
 271                         if (strcmp(d->name, g->name) < 0)
 272                                 setting = d++;
 273                         else
 274                                 setting = g++;
 275                 } else if (d && d->name) {
 276                         setting = d++;
 277                 } else
 278                         setting = g++;
 279                 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
 280                 div_factor = setting->divf ? setting->divf(drive) : 1;
 281                 out += sprintf(out, "%-24s", setting->name);
 282                 rc = ide_read_setting(drive, setting);
 283                 if (rc >= 0)
 284                         out += sprintf(out, "%-16d", rc * mul_factor / div_factor);
 285                 else
 286                         out += sprintf(out, "%-16s", "write-only");
 287                 out += sprintf(out, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
 288                 ds = setting->setting;
 289                 if (ds->get)
 290                         out += sprintf(out, "r");
 291                 if (ds->set)
 292                         out += sprintf(out, "w");
 293                 out += sprintf(out, "\n");
 294         }
 295         len = out - page;
 296         mutex_unlock(&ide_setting_mtx);
 297         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 298 }
 299
 300 #define MAX_LEN 30
 301
 302 static int proc_ide_write_settings(struct file *file, const char __user *buffer,
 303                                    unsigned long count, void *data)
 304 {
 305         ide_drive_t     *drive = (ide_drive_t *) data;
 306         char            name[MAX_LEN + 1];
 307         int             for_real = 0, mul_factor, div_factor;
 308         unsigned long   n;
 309
 310         const struct ide_proc_devset *setting;
 311         char *buf, *s;
 312
 313         if (!capable(CAP_SYS_ADMIN))
 314                 return -EACCES;
 315
 316         proc_ide_settings_warn();
 317
 318         if (count >= PAGE_SIZE)
 319                 return -EINVAL;
 320
 321         s = buf = (char *)__get_free_page(GFP_USER);
 322         if (!buf)
 323                 return -ENOMEM;
 324
 325         if (copy_from_user(buf, buffer, count)) {
 326                 free_page((unsigned long)buf);
 327                 return -EFAULT;
 328         }
 329
 330         buf[count] = '\0';
 331
 332         /*
 333          * Skip over leading whitespace
 334          */
 335         while (count && isspace(*s)) {
 336                 --count;
 337                 ++s;
 338         }
 339         /*
 340          * Do one full pass to verify all parameters,
 341          * then do another to actually write the new settings.
 342          */
 343         do {
 344                 char *p = s;
 345                 n = count;
 346                 while (n > 0) {
 347                         unsigned val;
 348                         char *q = p;
 349
 350                         while (n > 0 && *p != ':') {
 351                                 --n;
 352                                 p++;
 353                         }
 354                         if (*p != ':')
 355                                 goto parse_error;
 356                         if (p - q > MAX_LEN)
 357                                 goto parse_error;
 358                         memcpy(name, q, p - q);
 359                         name[p - q] = 0;
 360
 361                         if (n > 0) {
 362                                 --n;
 363                                 p++;
 364                         } else
 365                                 goto parse_error;
 366
 367                         val = simple_strtoul(p, &q, 10);
 368                         n -= q - p;
 369                         p = q;
 370                         if (n > 0 && !isspace(*p))
 371                                 goto parse_error;
 372                         while (n > 0 && isspace(*p)) {
 373                                 --n;
 374                                 ++p;
 375                         }
 376
 377                         mutex_lock(&ide_setting_mtx);
 378                         /* generic settings first, then driver specific ones */
 379                         setting = ide_find_setting(ide_generic_settings, name);
 380                         if (!setting) {
 381                                 if (drive->settings)
 382                                         setting = ide_find_setting(drive->settings, name);
 383                                 if (!setting) {
 384                                         mutex_unlock(&ide_setting_mtx);
 385                                         goto parse_error;
 386                                 }
 387                         }
 388                         if (for_real) {
 389                                 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
 390                                 div_factor = setting->divf ? setting->divf(drive) : 1;
 391                                 ide_write_setting(drive, setting, val * div_factor / mul_factor);
 392                         }
 393                         mutex_unlock(&ide_setting_mtx);
 394                 }
 395         } while (!for_real++);
 396         free_page((unsigned long)buf);
 397         return count;
 398 parse_error:
 399         free_page((unsigned long)buf);
 400         printk("proc_ide_write_settings(): parse error\n");
 401         return -EINVAL;
 402 }
 403
 404 int proc_ide_read_capacity
 405         (char *page, char **start, off_t off, int count, int *eof, void *data)
 406 {
 407         int len = sprintf(page, "%llu\n", (long long)0x7fffffff);
 408         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 409 }
 410
 411 EXPORT_SYMBOL_GPL(proc_ide_read_capacity);
 412
 413 int proc_ide_read_geometry
 414         (char *page, char **start, off_t off, int count, int *eof, void *data)
 415 {
 416         ide_drive_t     *drive = (ide_drive_t *) data;
 417         char            *out = page;
 418         int             len;
 419
 420         out += sprintf(out, "physical     %d/%d/%d\n",
 421                         drive->cyl, drive->head, drive->sect);
 422         out += sprintf(out, "logical      %d/%d/%d\n",
 423                         drive->bios_cyl, drive->bios_head, drive->bios_sect);
 424
 425         len = out - page;
 426         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 427 }
 428
 429 EXPORT_SYMBOL(proc_ide_read_geometry);
 430
 431 static int proc_ide_read_dmodel
 432         (char *page, char **start, off_t off, int count, int *eof, void *data)
 433 {
 434         ide_drive_t     *drive = (ide_drive_t *) data;
 435         char            *m = (char *)&drive->id[ATA_ID_PROD];
 436         int             len;
 437
 438         len = sprintf(page, "%.40s\n", m[0] ? m : "(none)");
 439         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 440 }
 441
 442 static int proc_ide_read_driver
 443         (char *page, char **start, off_t off, int count, int *eof, void *data)
 444 {
 445         ide_drive_t     *drive = (ide_drive_t *) data;
 446         struct device   *dev = &drive->gendev;
 447         ide_driver_t    *ide_drv;
 448         int             len;
 449
 450         if (dev->driver) {
 451                 ide_drv = container_of(dev->driver, ide_driver_t, gen_driver);
 452                 len = sprintf(page, "%s version %s\n",
 453                                 dev->driver->name, ide_drv->version);
 454         } else
 455                 len = sprintf(page, "ide-default version 0.9.newide\n");
 456         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 457 }
 458
 459 static int ide_replace_subdriver(ide_drive_t *drive, const char *driver)
 460 {
 461         struct device *dev = &drive->gendev;
 462         int ret = 1;
 463         int err;
 464
 465         device_release_driver(dev);
 466         /* FIXME: device can still be in use by previous driver */
 467         strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
 468         err = device_attach(dev);
 469         if (err < 0)
 470                 printk(KERN_WARNING "IDE: %s: device_attach error: %d\n",
 471                         __func__, err);
 472         drive->driver_req[0] = 0;
 473         if (dev->driver == NULL) {
 474                 err = device_attach(dev);
 475                 if (err < 0)
 476                         printk(KERN_WARNING
 477                                 "IDE: %s: device_attach(2) error: %d\n",
 478                                 __func__, err);
 479         }
 480         if (dev->driver && !strcmp(dev->driver->name, driver))
 481                 ret = 0;
 482
 483         return ret;
 484 }
 485
 486 static int proc_ide_write_driver
 487         (struct file *file, const char __user *buffer, unsigned long count, void *data)
 488 {
 489         ide_drive_t     *drive = (ide_drive_t *) data;
 490         char name[32];
 491
 492         if (!capable(CAP_SYS_ADMIN))
 493                 return -EACCES;
 494         if (count > 31)
 495                 count = 31;
 496         if (copy_from_user(name, buffer, count))
 497                 return -EFAULT;
 498         name[count] = '\0';
 499         if (ide_replace_subdriver(drive, name))
 500                 return -EINVAL;
 501         return count;
 502 }
 503
 504 static int proc_ide_read_media
 505         (char *page, char **start, off_t off, int count, int *eof, void *data)
 506 {
 507         ide_drive_t     *drive = (ide_drive_t *) data;
 508         const char      *media;
 509         int             len;
 510
 511         switch (drive->media) {
 512         case ide_disk:          media = "disk\n";       break;
 513         case ide_cdrom:         media = "cdrom\n";      break;
 514         case ide_tape:          media = "tape\n";       break;
 515         case ide_floppy:        media = "floppy\n";     break;
 516         case ide_optical:       media = "optical\n";    break;
 517         default:                media = "UNKNOWN\n";    break;
 518         }
 519         strcpy(page, media);
 520         len = strlen(media);
 521         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 522 }
 523
 524 static ide_proc_entry_t generic_drive_entries[] = {
 525         { "driver",     S_IFREG|S_IRUGO,         proc_ide_read_driver,
 526                                                  proc_ide_write_driver },
 527         { "identify",   S_IFREG|S_IRUSR,         proc_ide_read_identify, NULL },
 528         { "media",      S_IFREG|S_IRUGO,         proc_ide_read_media,    NULL },
 529         { "model",      S_IFREG|S_IRUGO,         proc_ide_read_dmodel,   NULL },
 530         { "settings",   S_IFREG|S_IRUSR|S_IWUSR, proc_ide_read_settings,
 531                                                  proc_ide_write_settings },
 532         { NULL, 0, NULL, NULL }
 533 };
 534
 535 static void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
 536 {
 537         struct proc_dir_entry *ent;
 538
 539         if (!dir || !p)
 540                 return;
 541         while (p->name != NULL) {
 542                 ent = create_proc_entry(p->name, p->mode, dir);
 543                 if (!ent) return;
 544                 ent->data = data;
 545                 ent->read_proc = p->read_proc;
 546                 ent->write_proc = p->write_proc;
 547                 p++;
 548         }
 549 }
 550
 551 static void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
 552 {
 553         if (!dir || !p)
 554                 return;
 555         while (p->name != NULL) {
 556                 remove_proc_entry(p->name, dir);
 557                 p++;
 558         }
 559 }
 560
 561 void ide_proc_register_driver(ide_drive_t *drive, ide_driver_t *driver)
 562 {
 563         mutex_lock(&ide_setting_mtx);
 564         drive->settings = driver->proc_devsets(drive);
 565         mutex_unlock(&ide_setting_mtx);
 566
 567         ide_add_proc_entries(drive->proc, driver->proc_entries(drive), drive);
 568 }
 569
 570 EXPORT_SYMBOL(ide_proc_register_driver);
 571
 572 /**
 573  *      ide_proc_unregister_driver      -       remove driver specific data
 574  *      @drive: drive
 575  *      @driver: driver
 576  *
 577  *      Clean up the driver specific /proc files and IDE settings
 578  *      for a given drive.
 579  *
 580  *      Takes ide_setting_mtx.
 581  */
 582
 583 void ide_proc_unregister_driver(ide_drive_t *drive, ide_driver_t *driver)
 584 {
 585         ide_remove_proc_entries(drive->proc, driver->proc_entries(drive));
 586
 587         mutex_lock(&ide_setting_mtx);
 588         /*
 589          * ide_setting_mtx protects both the settings list and the use
 590          * of settings (we cannot take a setting out that is being used).
 591          */
 592         drive->settings = NULL;
 593         mutex_unlock(&ide_setting_mtx);
 594 }
 595 EXPORT_SYMBOL(ide_proc_unregister_driver);
 596
 597 void ide_proc_port_register_devices(ide_hwif_t *hwif)
 598 {
 599         int     d;
 600         struct proc_dir_entry *ent;
 601         struct proc_dir_entry *parent = hwif->proc;
 602         char name[64];
 603
 604         for (d = 0; d < MAX_DRIVES; d++) {
 605                 ide_drive_t *drive = &hwif->drives[d];
 606
 607                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0 || drive->proc)
 608                         continue;
 609
 610                 drive->proc = proc_mkdir(drive->name, parent);
 611                 if (drive->proc)
 612                         ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
 613                 sprintf(name, "ide%d/%s", (drive->name[2]-'a')/2, drive->name);
 614                 ent = proc_symlink(drive->name, proc_ide_root, name);
 615                 if (!ent) return;
 616         }
 617 }
 618
 619 void ide_proc_unregister_device(ide_drive_t *drive)
 620 {
 621         if (drive->proc) {
 622                 ide_remove_proc_entries(drive->proc, generic_drive_entries);
 623                 remove_proc_entry(drive->name, proc_ide_root);
 624                 remove_proc_entry(drive->name, drive->hwif->proc);
 625                 drive->proc = NULL;
 626         }
 627 }
 628
 629 static ide_proc_entry_t hwif_entries[] = {
 630         { "channel",    S_IFREG|S_IRUGO,        proc_ide_read_channel,  NULL },
 631         { "mate",       S_IFREG|S_IRUGO,        proc_ide_read_mate,     NULL },
 632         { "model",      S_IFREG|S_IRUGO,        proc_ide_read_imodel,   NULL },
 633         { NULL, 0, NULL, NULL }
 634 };
 635
 636 void ide_proc_register_port(ide_hwif_t *hwif)
 637 {
 638         if (!hwif->proc) {
 639                 hwif->proc = proc_mkdir(hwif->name, proc_ide_root);
 640
 641                 if (!hwif->proc)
 642                         return;
 643
 644                 ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
 645         }
 646 }
 647
 648 void ide_proc_unregister_port(ide_hwif_t *hwif)
 649 {
 650         if (hwif->proc) {
 651                 ide_remove_proc_entries(hwif->proc, hwif_entries);
 652                 remove_proc_entry(hwif->name, proc_ide_root);
 653                 hwif->proc = NULL;
 654         }
 655 }
 656
 657 static int proc_print_driver(struct device_driver *drv, void *data)
 658 {
 659         ide_driver_t *ide_drv = container_of(drv, ide_driver_t, gen_driver);
 660         struct seq_file *s = data;
 661
 662         seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);
 663
 664         return 0;
 665 }
 666
 667 static int ide_drivers_show(struct seq_file *s, void *p)
 668 {
 669         int err;
 670
 671         err = bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
 672         if (err < 0)
 673                 printk(KERN_WARNING "IDE: %s: bus_for_each_drv error: %d\n",
 674                         __func__, err);
 675         return 0;
 676 }
 677
 678 static int ide_drivers_open(struct inode *inode, struct file *file)
 679 {
 680         return single_open(file, &ide_drivers_show, NULL);
 681 }
 682
 683 static const struct file_operations ide_drivers_operations = {
 684         .owner          = THIS_MODULE,
 685         .open           = ide_drivers_open,
 686         .read           = seq_read,
 687         .llseek         = seq_lseek,
 688         .release        = single_release,
 689 };
 690
 691 void proc_ide_create(void)
 692 {
 693         proc_ide_root = proc_mkdir("ide", NULL);
 694
 695         if (!proc_ide_root)
 696                 return;
 697
 698         proc_create("drivers", 0, proc_ide_root, &ide_drivers_operations);
 699 }
 700
 701 void proc_ide_destroy(void)
 702 {
 703         remove_proc_entry("drivers", proc_ide_root);
 704         remove_proc_entry("ide", NULL);
 705 }