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_rz1000:        name = "rz1000";        break;
  50         case ide_trm290:        name = "trm290";        break;
  51         case ide_cmd646:        name = "cmd646";        break;
  52         case ide_cy82c693:      name = "cy82c693";      break;
  53         case ide_4drives:       name = "4drives";       break;
  54         case ide_pmac:          name = "mac-io";        break;
  55         case ide_au1xxx:        name = "au1xxx";        break;
  56         case ide_palm3710:      name = "palm3710";      break;
  57         case ide_acorn:         name = "acorn";         break;
  58         default:                name = "(unknown)";     break;
  59         }
  60         len = sprintf(page, "%s\n", name);
  61         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  62 }
  63
  64 static int proc_ide_read_mate
  65         (char *page, char **start, off_t off, int count, int *eof, void *data)
  66 {
  67         ide_hwif_t      *hwif = (ide_hwif_t *) data;
  68         int             len;
  69
  70         if (hwif && hwif->mate)
  71                 len = sprintf(page, "%s\n", hwif->mate->name);
  72         else
  73                 len = sprintf(page, "(none)\n");
  74         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  75 }
  76
  77 static int proc_ide_read_channel
  78         (char *page, char **start, off_t off, int count, int *eof, void *data)
  79 {
  80         ide_hwif_t      *hwif = (ide_hwif_t *) data;
  81         int             len;
  82
  83         page[0] = hwif->channel ? '1' : '0';
  84         page[1] = '\n';
  85         len = 2;
  86         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  87 }
  88
  89 static int proc_ide_read_identify
  90         (char *page, char **start, off_t off, int count, int *eof, void *data)
  91 {
  92         ide_drive_t     *drive = (ide_drive_t *)data;
  93         int             len = 0, i = 0;
  94         int             err = 0;
  95
  96         len = sprintf(page, "\n");
  97
  98         if (drive) {
  99                 __le16 *val = (__le16 *)page;
 100
 101                 err = taskfile_lib_get_identify(drive, page);
 102                 if (!err) {
 103                         char *out = (char *)page + SECTOR_SIZE;
 104
 105                         page = out;
 106                         do {
 107                                 out += sprintf(out, "%04x%c",
 108                                         le16_to_cpup(val), (++i & 7) ? ' ' : '\n');
 109                                 val += 1;
 110                         } while (i < SECTOR_SIZE / 2);
 111                         len = out - page;
 112                 }
 113         }
 114         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 115 }
 116
 117 /**
 118  *      ide_find_setting        -       find a specific setting
 119  *      @st: setting table pointer
 120  *      @name: setting name
 121  *
 122  *      Scan's the setting table for a matching entry and returns
 123  *      this or NULL if no entry is found. The caller must hold the
 124  *      setting semaphore
 125  */
 126
 127 static
 128 const struct ide_proc_devset *ide_find_setting(const struct ide_proc_devset *st,
 129                                                char *name)
 130 {
 131         while (st->name) {
 132                 if (strcmp(st->name, name) == 0)
 133                         break;
 134                 st++;
 135         }
 136         return st->name ? st : NULL;
 137 }
 138
 139 /**
 140  *      ide_read_setting        -       read an IDE setting
 141  *      @drive: drive to read from
 142  *      @setting: drive setting
 143  *
 144  *      Read a drive setting and return the value. The caller
 145  *      must hold the ide_setting_mtx when making this call.
 146  *
 147  *      BUGS: the data return and error are the same return value
 148  *      so an error -EINVAL and true return of the same value cannot
 149  *      be told apart
 150  */
 151
 152 static int ide_read_setting(ide_drive_t *drive,
 153                             const struct ide_proc_devset *setting)
 154 {
 155         const struct ide_devset *ds = setting->setting;
 156         int val = -EINVAL;
 157
 158         if (ds->get)
 159                 val = ds->get(drive);
 160
 161         return val;
 162 }
 163
 164 /**
 165  *      ide_write_setting       -       read an IDE setting
 166  *      @drive: drive to read from
 167  *      @setting: drive setting
 168  *      @val: value
 169  *
 170  *      Write a drive setting if it is possible. The caller
 171  *      must hold the ide_setting_mtx when making this call.
 172  *
 173  *      BUGS: the data return and error are the same return value
 174  *      so an error -EINVAL and true return of the same value cannot
 175  *      be told apart
 176  *
 177  *      FIXME:  This should be changed to enqueue a special request
 178  *      to the driver to change settings, and then wait on a sema for completion.
 179  *      The current scheme of polling is kludgy, though safe enough.
 180  */
 181
 182 static int ide_write_setting(ide_drive_t *drive,
 183                              const struct ide_proc_devset *setting, int val)
 184 {
 185         const struct ide_devset *ds = setting->setting;
 186
 187         if (!capable(CAP_SYS_ADMIN))
 188                 return -EACCES;
 189         if (!ds->set)
 190                 return -EPERM;
 191         if ((ds->flags & DS_SYNC)
 192             && (val < setting->min || val > setting->max))
 193                 return -EINVAL;
 194         return ide_devset_execute(drive, ds, val);
 195 }
 196
 197 ide_devset_get(xfer_rate, current_speed);
 198
 199 static int set_xfer_rate (ide_drive_t *drive, int arg)
 200 {
 201         ide_task_t task;
 202         int err;
 203
 204         if (arg < XFER_PIO_0 || arg > XFER_UDMA_6)
 205                 return -EINVAL;
 206
 207         memset(&task, 0, sizeof(task));
 208         task.tf.command = ATA_CMD_SET_FEATURES;
 209         task.tf.feature = SETFEATURES_XFER;
 210         task.tf.nsect   = (u8)arg;
 211         task.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT |
 212                         IDE_TFLAG_IN_NSECT;
 213
 214         err = ide_no_data_taskfile(drive, &task);
 215
 216         if (!err) {
 217                 ide_set_xfer_rate(drive, (u8) arg);
 218                 ide_driveid_update(drive);
 219         }
 220         return err;
 221 }
 222
 223 ide_devset_rw(current_speed, xfer_rate);
 224 ide_devset_rw_field(init_speed, init_speed);
 225 ide_devset_rw_flag(nice1, IDE_DFLAG_NICE1);
 226 ide_devset_rw_field(number, dn);
 227
 228 static const struct ide_proc_devset ide_generic_settings[] = {
 229         IDE_PROC_DEVSET(current_speed, 0, 70),
 230         IDE_PROC_DEVSET(init_speed, 0, 70),
 231         IDE_PROC_DEVSET(io_32bit,  0, 1 + (SUPPORT_VLB_SYNC << 1)),
 232         IDE_PROC_DEVSET(keepsettings, 0, 1),
 233         IDE_PROC_DEVSET(nice1, 0, 1),
 234         IDE_PROC_DEVSET(number, 0, 3),
 235         IDE_PROC_DEVSET(pio_mode, 0, 255),
 236         IDE_PROC_DEVSET(unmaskirq, 0, 1),
 237         IDE_PROC_DEVSET(using_dma, 0, 1),
 238         { 0 },
 239 };
 240
 241 static void proc_ide_settings_warn(void)
 242 {
 243         static int warned;
 244
 245         if (warned)
 246                 return;
 247
 248         printk(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "
 249                             "obsolete, and will be removed soon!\n");
 250         warned = 1;
 251 }
 252
 253 static int proc_ide_read_settings
 254         (char *page, char **start, off_t off, int count, int *eof, void *data)
 255 {
 256         const struct ide_proc_devset *setting, *g, *d;
 257         const struct ide_devset *ds;
 258         ide_drive_t     *drive = (ide_drive_t *) data;
 259         char            *out = page;
 260         int             len, rc, mul_factor, div_factor;
 261
 262         proc_ide_settings_warn();
 263
 264         mutex_lock(&ide_setting_mtx);
 265         g = ide_generic_settings;
 266         d = drive->settings;
 267         out += sprintf(out, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
 268         out += sprintf(out, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
 269         while (g->name || (d && d->name)) {
 270                 /* read settings in the alphabetical order */
 271                 if (g->name && d && d->name) {
 272                         if (strcmp(d->name, g->name) < 0)
 273                                 setting = d++;
 274                         else
 275                                 setting = g++;
 276                 } else if (d && d->name) {
 277                         setting = d++;
 278                 } else
 279                         setting = g++;
 280                 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
 281                 div_factor = setting->divf ? setting->divf(drive) : 1;
 282                 out += sprintf(out, "%-24s", setting->name);
 283                 rc = ide_read_setting(drive, setting);
 284                 if (rc >= 0)
 285                         out += sprintf(out, "%-16d", rc * mul_factor / div_factor);
 286                 else
 287                         out += sprintf(out, "%-16s", "write-only");
 288                 out += sprintf(out, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
 289                 ds = setting->setting;
 290                 if (ds->get)
 291                         out += sprintf(out, "r");
 292                 if (ds->set)
 293                         out += sprintf(out, "w");
 294                 out += sprintf(out, "\n");
 295         }
 296         len = out - page;
 297         mutex_unlock(&ide_setting_mtx);
 298         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 299 }
 300
 301 #define MAX_LEN 30
 302
 303 static int proc_ide_write_settings(struct file *file, const char __user *buffer,
 304                                    unsigned long count, void *data)
 305 {
 306         ide_drive_t     *drive = (ide_drive_t *) data;
 307         char            name[MAX_LEN + 1];
 308         int             for_real = 0, mul_factor, div_factor;
 309         unsigned long   n;
 310
 311         const struct ide_proc_devset *setting;
 312         char *buf, *s;
 313
 314         if (!capable(CAP_SYS_ADMIN))
 315                 return -EACCES;
 316
 317         proc_ide_settings_warn();
 318
 319         if (count >= PAGE_SIZE)
 320                 return -EINVAL;
 321
 322         s = buf = (char *)__get_free_page(GFP_USER);
 323         if (!buf)
 324                 return -ENOMEM;
 325
 326         if (copy_from_user(buf, buffer, count)) {
 327                 free_page((unsigned long)buf);
 328                 return -EFAULT;
 329         }
 330
 331         buf[count] = '\0';
 332
 333         /*
 334          * Skip over leading whitespace
 335          */
 336         while (count && isspace(*s)) {
 337                 --count;
 338                 ++s;
 339         }
 340         /*
 341          * Do one full pass to verify all parameters,
 342          * then do another to actually write the new settings.
 343          */
 344         do {
 345                 char *p = s;
 346                 n = count;
 347                 while (n > 0) {
 348                         unsigned val;
 349                         char *q = p;
 350
 351                         while (n > 0 && *p != ':') {
 352                                 --n;
 353                                 p++;
 354                         }
 355                         if (*p != ':')
 356                                 goto parse_error;
 357                         if (p - q > MAX_LEN)
 358                                 goto parse_error;
 359                         memcpy(name, q, p - q);
 360                         name[p - q] = 0;
 361
 362                         if (n > 0) {
 363                                 --n;
 364                                 p++;
 365                         } else
 366                                 goto parse_error;
 367
 368                         val = simple_strtoul(p, &q, 10);
 369                         n -= q - p;
 370                         p = q;
 371                         if (n > 0 && !isspace(*p))
 372                                 goto parse_error;
 373                         while (n > 0 && isspace(*p)) {
 374                                 --n;
 375                                 ++p;
 376                         }
 377
 378                         mutex_lock(&ide_setting_mtx);
 379                         /* generic settings first, then driver specific ones */
 380                         setting = ide_find_setting(ide_generic_settings, name);
 381                         if (!setting) {
 382                                 if (drive->settings)
 383                                         setting = ide_find_setting(drive->settings, name);
 384                                 if (!setting) {
 385                                         mutex_unlock(&ide_setting_mtx);
 386                                         goto parse_error;
 387                                 }
 388                         }
 389                         if (for_real) {
 390                                 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
 391                                 div_factor = setting->divf ? setting->divf(drive) : 1;
 392                                 ide_write_setting(drive, setting, val * div_factor / mul_factor);
 393                         }
 394                         mutex_unlock(&ide_setting_mtx);
 395                 }
 396         } while (!for_real++);
 397         free_page((unsigned long)buf);
 398         return count;
 399 parse_error:
 400         free_page((unsigned long)buf);
 401         printk("proc_ide_write_settings(): parse error\n");
 402         return -EINVAL;
 403 }
 404
 405 int proc_ide_read_capacity
 406         (char *page, char **start, off_t off, int count, int *eof, void *data)
 407 {
 408         int len = sprintf(page, "%llu\n", (long long)0x7fffffff);
 409         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 410 }
 411
 412 EXPORT_SYMBOL_GPL(proc_ide_read_capacity);
 413
 414 int proc_ide_read_geometry
 415         (char *page, char **start, off_t off, int count, int *eof, void *data)
 416 {
 417         ide_drive_t     *drive = (ide_drive_t *) data;
 418         char            *out = page;
 419         int             len;
 420
 421         out += sprintf(out, "physical     %d/%d/%d\n",
 422                         drive->cyl, drive->head, drive->sect);
 423         out += sprintf(out, "logical      %d/%d/%d\n",
 424                         drive->bios_cyl, drive->bios_head, drive->bios_sect);
 425
 426         len = out - page;
 427         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 428 }
 429
 430 EXPORT_SYMBOL(proc_ide_read_geometry);
 431
 432 static int proc_ide_read_dmodel
 433         (char *page, char **start, off_t off, int count, int *eof, void *data)
 434 {
 435         ide_drive_t     *drive = (ide_drive_t *) data;
 436         char            *m = (char *)&drive->id[ATA_ID_PROD];
 437         int             len;
 438
 439         len = sprintf(page, "%.40s\n", m[0] ? m : "(none)");
 440         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 441 }
 442
 443 static int proc_ide_read_driver
 444         (char *page, char **start, off_t off, int count, int *eof, void *data)
 445 {
 446         ide_drive_t     *drive = (ide_drive_t *) data;
 447         struct device   *dev = &drive->gendev;
 448         ide_driver_t    *ide_drv;
 449         int             len;
 450
 451         if (dev->driver) {
 452                 ide_drv = container_of(dev->driver, ide_driver_t, gen_driver);
 453                 len = sprintf(page, "%s version %s\n",
 454                                 dev->driver->name, ide_drv->version);
 455         } else
 456                 len = sprintf(page, "ide-default version 0.9.newide\n");
 457         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 458 }
 459
 460 static int ide_replace_subdriver(ide_drive_t *drive, const char *driver)
 461 {
 462         struct device *dev = &drive->gendev;
 463         int ret = 1;
 464         int err;
 465
 466         device_release_driver(dev);
 467         /* FIXME: device can still be in use by previous driver */
 468         strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
 469         err = device_attach(dev);
 470         if (err < 0)
 471                 printk(KERN_WARNING "IDE: %s: device_attach error: %d\n",
 472                         __func__, err);
 473         drive->driver_req[0] = 0;
 474         if (dev->driver == NULL) {
 475                 err = device_attach(dev);
 476                 if (err < 0)
 477                         printk(KERN_WARNING
 478                                 "IDE: %s: device_attach(2) error: %d\n",
 479                                 __func__, err);
 480         }
 481         if (dev->driver && !strcmp(dev->driver->name, driver))
 482                 ret = 0;
 483
 484         return ret;
 485 }
 486
 487 static int proc_ide_write_driver
 488         (struct file *file, const char __user *buffer, unsigned long count, void *data)
 489 {
 490         ide_drive_t     *drive = (ide_drive_t *) data;
 491         char name[32];
 492
 493         if (!capable(CAP_SYS_ADMIN))
 494                 return -EACCES;
 495         if (count > 31)
 496                 count = 31;
 497         if (copy_from_user(name, buffer, count))
 498                 return -EFAULT;
 499         name[count] = '\0';
 500         if (ide_replace_subdriver(drive, name))
 501                 return -EINVAL;
 502         return count;
 503 }
 504
 505 static int proc_ide_read_media
 506         (char *page, char **start, off_t off, int count, int *eof, void *data)
 507 {
 508         ide_drive_t     *drive = (ide_drive_t *) data;
 509         const char      *media;
 510         int             len;
 511
 512         switch (drive->media) {
 513         case ide_disk:          media = "disk\n";       break;
 514         case ide_cdrom:         media = "cdrom\n";      break;
 515         case ide_tape:          media = "tape\n";       break;
 516         case ide_floppy:        media = "floppy\n";     break;
 517         case ide_optical:       media = "optical\n";    break;
 518         default:                media = "UNKNOWN\n";    break;
 519         }
 520         strcpy(page, media);
 521         len = strlen(media);
 522         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 523 }
 524
 525 static ide_proc_entry_t generic_drive_entries[] = {
 526         { "driver",     S_IFREG|S_IRUGO,         proc_ide_read_driver,
 527                                                  proc_ide_write_driver },
 528         { "identify",   S_IFREG|S_IRUSR,         proc_ide_read_identify, NULL },
 529         { "media",      S_IFREG|S_IRUGO,         proc_ide_read_media,    NULL },
 530         { "model",      S_IFREG|S_IRUGO,         proc_ide_read_dmodel,   NULL },
 531         { "settings",   S_IFREG|S_IRUSR|S_IWUSR, proc_ide_read_settings,
 532                                                  proc_ide_write_settings },
 533         { NULL, 0, NULL, NULL }
 534 };
 535
 536 static void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
 537 {
 538         struct proc_dir_entry *ent;
 539
 540         if (!dir || !p)
 541                 return;
 542         while (p->name != NULL) {
 543                 ent = create_proc_entry(p->name, p->mode, dir);
 544                 if (!ent) return;
 545                 ent->data = data;
 546                 ent->read_proc = p->read_proc;
 547                 ent->write_proc = p->write_proc;
 548                 p++;
 549         }
 550 }
 551
 552 static void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
 553 {
 554         if (!dir || !p)
 555                 return;
 556         while (p->name != NULL) {
 557                 remove_proc_entry(p->name, dir);
 558                 p++;
 559         }
 560 }
 561
 562 void ide_proc_register_driver(ide_drive_t *drive, ide_driver_t *driver)
 563 {
 564         mutex_lock(&ide_setting_mtx);
 565         drive->settings = driver->proc_devsets(drive);
 566         mutex_unlock(&ide_setting_mtx);
 567
 568         ide_add_proc_entries(drive->proc, driver->proc_entries(drive), drive);
 569 }
 570
 571 EXPORT_SYMBOL(ide_proc_register_driver);
 572
 573 /**
 574  *      ide_proc_unregister_driver      -       remove driver specific data
 575  *      @drive: drive
 576  *      @driver: driver
 577  *
 578  *      Clean up the driver specific /proc files and IDE settings
 579  *      for a given drive.
 580  *
 581  *      Takes ide_setting_mtx.
 582  */
 583
 584 void ide_proc_unregister_driver(ide_drive_t *drive, ide_driver_t *driver)
 585 {
 586         ide_remove_proc_entries(drive->proc, driver->proc_entries(drive));
 587
 588         mutex_lock(&ide_setting_mtx);
 589         /*
 590          * ide_setting_mtx protects both the settings list and the use
 591          * of settings (we cannot take a setting out that is being used).
 592          */
 593         drive->settings = NULL;
 594         mutex_unlock(&ide_setting_mtx);
 595 }
 596 EXPORT_SYMBOL(ide_proc_unregister_driver);
 597
 598 void ide_proc_port_register_devices(ide_hwif_t *hwif)
 599 {
 600         int     d;
 601         struct proc_dir_entry *ent;
 602         struct proc_dir_entry *parent = hwif->proc;
 603         char name[64];
 604
 605         for (d = 0; d < MAX_DRIVES; d++) {
 606                 ide_drive_t *drive = &hwif->drives[d];
 607
 608                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0 || drive->proc)
 609                         continue;
 610
 611                 drive->proc = proc_mkdir(drive->name, parent);
 612                 if (drive->proc)
 613                         ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
 614                 sprintf(name, "ide%d/%s", (drive->name[2]-'a')/2, drive->name);
 615                 ent = proc_symlink(drive->name, proc_ide_root, name);
 616                 if (!ent) return;
 617         }
 618 }
 619
 620 void ide_proc_unregister_device(ide_drive_t *drive)
 621 {
 622         if (drive->proc) {
 623                 ide_remove_proc_entries(drive->proc, generic_drive_entries);
 624                 remove_proc_entry(drive->name, proc_ide_root);
 625                 remove_proc_entry(drive->name, drive->hwif->proc);
 626                 drive->proc = NULL;
 627         }
 628 }
 629
 630 static ide_proc_entry_t hwif_entries[] = {
 631         { "channel",    S_IFREG|S_IRUGO,        proc_ide_read_channel,  NULL },
 632         { "mate",       S_IFREG|S_IRUGO,        proc_ide_read_mate,     NULL },
 633         { "model",      S_IFREG|S_IRUGO,        proc_ide_read_imodel,   NULL },
 634         { NULL, 0, NULL, NULL }
 635 };
 636
 637 void ide_proc_register_port(ide_hwif_t *hwif)
 638 {
 639         if (!hwif->proc) {
 640                 hwif->proc = proc_mkdir(hwif->name, proc_ide_root);
 641
 642                 if (!hwif->proc)
 643                         return;
 644
 645                 ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
 646         }
 647 }
 648
 649 void ide_proc_unregister_port(ide_hwif_t *hwif)
 650 {
 651         if (hwif->proc) {
 652                 ide_remove_proc_entries(hwif->proc, hwif_entries);
 653                 remove_proc_entry(hwif->name, proc_ide_root);
 654                 hwif->proc = NULL;
 655         }
 656 }
 657
 658 static int proc_print_driver(struct device_driver *drv, void *data)
 659 {
 660         ide_driver_t *ide_drv = container_of(drv, ide_driver_t, gen_driver);
 661         struct seq_file *s = data;
 662
 663         seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);
 664
 665         return 0;
 666 }
 667
 668 static int ide_drivers_show(struct seq_file *s, void *p)
 669 {
 670         int err;
 671
 672         err = bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
 673         if (err < 0)
 674                 printk(KERN_WARNING "IDE: %s: bus_for_each_drv error: %d\n",
 675                         __func__, err);
 676         return 0;
 677 }
 678
 679 static int ide_drivers_open(struct inode *inode, struct file *file)
 680 {
 681         return single_open(file, &ide_drivers_show, NULL);
 682 }
 683
 684 static const struct file_operations ide_drivers_operations = {
 685         .owner          = THIS_MODULE,
 686         .open           = ide_drivers_open,
 687         .read           = seq_read,
 688         .llseek         = seq_lseek,
 689         .release        = single_release,
 690 };
 691
 692 void proc_ide_create(void)
 693 {
 694         proc_ide_root = proc_mkdir("ide", NULL);
 695
 696         if (!proc_ide_root)
 697                 return;
 698
 699         proc_create("drivers", 0, proc_ide_root, &ide_drivers_operations);
 700 }
 701
 702 void proc_ide_destroy(void)
 703 {
 704         remove_proc_entry("drivers", proc_ide_root);
 705         remove_proc_entry("ide", NULL);
 706 }