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_4drives:       name = "4drives";       break;
  50         case ide_pmac:          name = "mac-io";        break;
  51         case ide_au1xxx:        name = "au1xxx";        break;
  52         case ide_palm3710:      name = "palm3710";      break;
  53         case ide_acorn:         name = "acorn";         break;
  54         default:                name = "(unknown)";     break;
  55         }
  56         len = sprintf(page, "%s\n", name);
  57         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  58 }
  59
  60 static int proc_ide_read_mate
  61         (char *page, char **start, off_t off, int count, int *eof, void *data)
  62 {
  63         ide_hwif_t      *hwif = (ide_hwif_t *) data;
  64         int             len;
  65
  66         if (hwif && hwif->mate)
  67                 len = sprintf(page, "%s\n", hwif->mate->name);
  68         else
  69                 len = sprintf(page, "(none)\n");
  70         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  71 }
  72
  73 static int proc_ide_read_channel
  74         (char *page, char **start, off_t off, int count, int *eof, void *data)
  75 {
  76         ide_hwif_t      *hwif = (ide_hwif_t *) data;
  77         int             len;
  78
  79         page[0] = hwif->channel ? '1' : '0';
  80         page[1] = '\n';
  81         len = 2;
  82         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  83 }
  84
  85 static int proc_ide_read_identify
  86         (char *page, char **start, off_t off, int count, int *eof, void *data)
  87 {
  88         ide_drive_t     *drive = (ide_drive_t *)data;
  89         int             len = 0, i = 0;
  90         int             err = 0;
  91
  92         len = sprintf(page, "\n");
  93
  94         if (drive) {
  95                 __le16 *val = (__le16 *)page;
  96
  97                 err = taskfile_lib_get_identify(drive, page);
  98                 if (!err) {
  99                         char *out = (char *)page + SECTOR_SIZE;
 100
 101                         page = out;
 102                         do {
 103                                 out += sprintf(out, "%04x%c",
 104                                         le16_to_cpup(val), (++i & 7) ? ' ' : '\n');
 105                                 val += 1;
 106                         } while (i < SECTOR_SIZE / 2);
 107                         len = out - page;
 108                 }
 109         }
 110         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 111 }
 112
 113 /**
 114  *      ide_find_setting        -       find a specific setting
 115  *      @st: setting table pointer
 116  *      @name: setting name
 117  *
 118  *      Scan's the setting table for a matching entry and returns
 119  *      this or NULL if no entry is found. The caller must hold the
 120  *      setting semaphore
 121  */
 122
 123 static
 124 const struct ide_proc_devset *ide_find_setting(const struct ide_proc_devset *st,
 125                                                char *name)
 126 {
 127         while (st->name) {
 128                 if (strcmp(st->name, name) == 0)
 129                         break;
 130                 st++;
 131         }
 132         return st->name ? st : NULL;
 133 }
 134
 135 /**
 136  *      ide_read_setting        -       read an IDE setting
 137  *      @drive: drive to read from
 138  *      @setting: drive setting
 139  *
 140  *      Read a drive setting and return the value. The caller
 141  *      must hold the ide_setting_mtx when making this call.
 142  *
 143  *      BUGS: the data return and error are the same return value
 144  *      so an error -EINVAL and true return of the same value cannot
 145  *      be told apart
 146  */
 147
 148 static int ide_read_setting(ide_drive_t *drive,
 149                             const struct ide_proc_devset *setting)
 150 {
 151         const struct ide_devset *ds = setting->setting;
 152         int val = -EINVAL;
 153
 154         if (ds->get)
 155                 val = ds->get(drive);
 156
 157         return val;
 158 }
 159
 160 /**
 161  *      ide_write_setting       -       read an IDE setting
 162  *      @drive: drive to read from
 163  *      @setting: drive setting
 164  *      @val: value
 165  *
 166  *      Write a drive setting if it is possible. The caller
 167  *      must hold the ide_setting_mtx when making this call.
 168  *
 169  *      BUGS: the data return and error are the same return value
 170  *      so an error -EINVAL and true return of the same value cannot
 171  *      be told apart
 172  *
 173  *      FIXME:  This should be changed to enqueue a special request
 174  *      to the driver to change settings, and then wait on a sema for completion.
 175  *      The current scheme of polling is kludgy, though safe enough.
 176  */
 177
 178 static int ide_write_setting(ide_drive_t *drive,
 179                              const struct ide_proc_devset *setting, int val)
 180 {
 181         const struct ide_devset *ds = setting->setting;
 182
 183         if (!capable(CAP_SYS_ADMIN))
 184                 return -EACCES;
 185         if (!ds->set)
 186                 return -EPERM;
 187         if ((ds->flags & DS_SYNC)
 188             && (val < setting->min || val > setting->max))
 189                 return -EINVAL;
 190         return ide_devset_execute(drive, ds, val);
 191 }
 192
 193 ide_devset_get(xfer_rate, current_speed);
 194
 195 static int set_xfer_rate (ide_drive_t *drive, int arg)
 196 {
 197         struct ide_cmd cmd;
 198
 199         if (arg < XFER_PIO_0 || arg > XFER_UDMA_6)
 200                 return -EINVAL;
 201
 202         memset(&cmd, 0, sizeof(cmd));
 203         cmd.tf.command = ATA_CMD_SET_FEATURES;
 204         cmd.tf.feature = SETFEATURES_XFER;
 205         cmd.tf.nsect   = (u8)arg;
 206         cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
 207         cmd.valid.in.tf  = IDE_VALID_NSECT;
 208         cmd.tf_flags   = IDE_TFLAG_SET_XFER;
 209
 210         return ide_no_data_taskfile(drive, &cmd);
 211 }
 212
 213 ide_devset_rw(current_speed, xfer_rate);
 214 ide_devset_rw_field(init_speed, init_speed);
 215 ide_devset_rw_flag(nice1, IDE_DFLAG_NICE1);
 216 ide_devset_rw_field(number, dn);
 217
 218 static const struct ide_proc_devset ide_generic_settings[] = {
 219         IDE_PROC_DEVSET(current_speed, 0, 70),
 220         IDE_PROC_DEVSET(init_speed, 0, 70),
 221         IDE_PROC_DEVSET(io_32bit,  0, 1 + (SUPPORT_VLB_SYNC << 1)),
 222         IDE_PROC_DEVSET(keepsettings, 0, 1),
 223         IDE_PROC_DEVSET(nice1, 0, 1),
 224         IDE_PROC_DEVSET(number, 0, 3),
 225         IDE_PROC_DEVSET(pio_mode, 0, 255),
 226         IDE_PROC_DEVSET(unmaskirq, 0, 1),
 227         IDE_PROC_DEVSET(using_dma, 0, 1),
 228         { NULL },
 229 };
 230
 231 static void proc_ide_settings_warn(void)
 232 {
 233         static int warned;
 234
 235         if (warned)
 236                 return;
 237
 238         printk(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "
 239                             "obsolete, and will be removed soon!\n");
 240         warned = 1;
 241 }
 242
 243 static int proc_ide_read_settings
 244         (char *page, char **start, off_t off, int count, int *eof, void *data)
 245 {
 246         const struct ide_proc_devset *setting, *g, *d;
 247         const struct ide_devset *ds;
 248         ide_drive_t     *drive = (ide_drive_t *) data;
 249         char            *out = page;
 250         int             len, rc, mul_factor, div_factor;
 251
 252         proc_ide_settings_warn();
 253
 254         mutex_lock(&ide_setting_mtx);
 255         g = ide_generic_settings;
 256         d = drive->settings;
 257         out += sprintf(out, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
 258         out += sprintf(out, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
 259         while (g->name || (d && d->name)) {
 260                 /* read settings in the alphabetical order */
 261                 if (g->name && d && d->name) {
 262                         if (strcmp(d->name, g->name) < 0)
 263                                 setting = d++;
 264                         else
 265                                 setting = g++;
 266                 } else if (d && d->name) {
 267                         setting = d++;
 268                 } else
 269                         setting = g++;
 270                 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
 271                 div_factor = setting->divf ? setting->divf(drive) : 1;
 272                 out += sprintf(out, "%-24s", setting->name);
 273                 rc = ide_read_setting(drive, setting);
 274                 if (rc >= 0)
 275                         out += sprintf(out, "%-16d", rc * mul_factor / div_factor);
 276                 else
 277                         out += sprintf(out, "%-16s", "write-only");
 278                 out += sprintf(out, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
 279                 ds = setting->setting;
 280                 if (ds->get)
 281                         out += sprintf(out, "r");
 282                 if (ds->set)
 283                         out += sprintf(out, "w");
 284                 out += sprintf(out, "\n");
 285         }
 286         len = out - page;
 287         mutex_unlock(&ide_setting_mtx);
 288         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 289 }
 290
 291 #define MAX_LEN 30
 292
 293 static int proc_ide_write_settings(struct file *file, const char __user *buffer,
 294                                    unsigned long count, void *data)
 295 {
 296         ide_drive_t     *drive = (ide_drive_t *) data;
 297         char            name[MAX_LEN + 1];
 298         int             for_real = 0, mul_factor, div_factor;
 299         unsigned long   n;
 300
 301         const struct ide_proc_devset *setting;
 302         char *buf, *s;
 303
 304         if (!capable(CAP_SYS_ADMIN))
 305                 return -EACCES;
 306
 307         proc_ide_settings_warn();
 308
 309         if (count >= PAGE_SIZE)
 310                 return -EINVAL;
 311
 312         s = buf = (char *)__get_free_page(GFP_USER);
 313         if (!buf)
 314                 return -ENOMEM;
 315
 316         if (copy_from_user(buf, buffer, count)) {
 317                 free_page((unsigned long)buf);
 318                 return -EFAULT;
 319         }
 320
 321         buf[count] = '\0';
 322
 323         /*
 324          * Skip over leading whitespace
 325          */
 326         while (count && isspace(*s)) {
 327                 --count;
 328                 ++s;
 329         }
 330         /*
 331          * Do one full pass to verify all parameters,
 332          * then do another to actually write the new settings.
 333          */
 334         do {
 335                 char *p = s;
 336                 n = count;
 337                 while (n > 0) {
 338                         unsigned val;
 339                         char *q = p;
 340
 341                         while (n > 0 && *p != ':') {
 342                                 --n;
 343                                 p++;
 344                         }
 345                         if (*p != ':')
 346                                 goto parse_error;
 347                         if (p - q > MAX_LEN)
 348                                 goto parse_error;
 349                         memcpy(name, q, p - q);
 350                         name[p - q] = 0;
 351
 352                         if (n > 0) {
 353                                 --n;
 354                                 p++;
 355                         } else
 356                                 goto parse_error;
 357
 358                         val = simple_strtoul(p, &q, 10);
 359                         n -= q - p;
 360                         p = q;
 361                         if (n > 0 && !isspace(*p))
 362                                 goto parse_error;
 363                         while (n > 0 && isspace(*p)) {
 364                                 --n;
 365                                 ++p;
 366                         }
 367
 368                         mutex_lock(&ide_setting_mtx);
 369                         /* generic settings first, then driver specific ones */
 370                         setting = ide_find_setting(ide_generic_settings, name);
 371                         if (!setting) {
 372                                 if (drive->settings)
 373                                         setting = ide_find_setting(drive->settings, name);
 374                                 if (!setting) {
 375                                         mutex_unlock(&ide_setting_mtx);
 376                                         goto parse_error;
 377                                 }
 378                         }
 379                         if (for_real) {
 380                                 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
 381                                 div_factor = setting->divf ? setting->divf(drive) : 1;
 382                                 ide_write_setting(drive, setting, val * div_factor / mul_factor);
 383                         }
 384                         mutex_unlock(&ide_setting_mtx);
 385                 }
 386         } while (!for_real++);
 387         free_page((unsigned long)buf);
 388         return count;
 389 parse_error:
 390         free_page((unsigned long)buf);
 391         printk("proc_ide_write_settings(): parse error\n");
 392         return -EINVAL;
 393 }
 394
 395 int proc_ide_read_capacity
 396         (char *page, char **start, off_t off, int count, int *eof, void *data)
 397 {
 398         int len = sprintf(page, "%llu\n", (long long)0x7fffffff);
 399         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 400 }
 401
 402 EXPORT_SYMBOL_GPL(proc_ide_read_capacity);
 403
 404 int proc_ide_read_geometry
 405         (char *page, char **start, off_t off, int count, int *eof, void *data)
 406 {
 407         ide_drive_t     *drive = (ide_drive_t *) data;
 408         char            *out = page;
 409         int             len;
 410
 411         out += sprintf(out, "physical     %d/%d/%d\n",
 412                         drive->cyl, drive->head, drive->sect);
 413         out += sprintf(out, "logical      %d/%d/%d\n",
 414                         drive->bios_cyl, drive->bios_head, drive->bios_sect);
 415
 416         len = out - page;
 417         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 418 }
 419
 420 EXPORT_SYMBOL(proc_ide_read_geometry);
 421
 422 static int proc_ide_read_dmodel
 423         (char *page, char **start, off_t off, int count, int *eof, void *data)
 424 {
 425         ide_drive_t     *drive = (ide_drive_t *) data;
 426         char            *m = (char *)&drive->id[ATA_ID_PROD];
 427         int             len;
 428
 429         len = sprintf(page, "%.40s\n", m[0] ? m : "(none)");
 430         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 431 }
 432
 433 static int proc_ide_read_driver
 434         (char *page, char **start, off_t off, int count, int *eof, void *data)
 435 {
 436         ide_drive_t             *drive = (ide_drive_t *)data;
 437         struct device           *dev = &drive->gendev;
 438         struct ide_driver       *ide_drv;
 439         int                     len;
 440
 441         if (dev->driver) {
 442                 ide_drv = to_ide_driver(dev->driver);
 443                 len = sprintf(page, "%s version %s\n",
 444                                 dev->driver->name, ide_drv->version);
 445         } else
 446                 len = sprintf(page, "ide-default version 0.9.newide\n");
 447         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 448 }
 449
 450 static int ide_replace_subdriver(ide_drive_t *drive, const char *driver)
 451 {
 452         struct device *dev = &drive->gendev;
 453         int ret = 1;
 454         int err;
 455
 456         device_release_driver(dev);
 457         /* FIXME: device can still be in use by previous driver */
 458         strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
 459         err = device_attach(dev);
 460         if (err < 0)
 461                 printk(KERN_WARNING "IDE: %s: device_attach error: %d\n",
 462                         __func__, err);
 463         drive->driver_req[0] = 0;
 464         if (dev->driver == NULL) {
 465                 err = device_attach(dev);
 466                 if (err < 0)
 467                         printk(KERN_WARNING
 468                                 "IDE: %s: device_attach(2) error: %d\n",
 469                                 __func__, err);
 470         }
 471         if (dev->driver && !strcmp(dev->driver->name, driver))
 472                 ret = 0;
 473
 474         return ret;
 475 }
 476
 477 static int proc_ide_write_driver
 478         (struct file *file, const char __user *buffer, unsigned long count, void *data)
 479 {
 480         ide_drive_t     *drive = (ide_drive_t *) data;
 481         char name[32];
 482
 483         if (!capable(CAP_SYS_ADMIN))
 484                 return -EACCES;
 485         if (count > 31)
 486                 count = 31;
 487         if (copy_from_user(name, buffer, count))
 488                 return -EFAULT;
 489         name[count] = '\0';
 490         if (ide_replace_subdriver(drive, name))
 491                 return -EINVAL;
 492         return count;
 493 }
 494
 495 static int proc_ide_read_media
 496         (char *page, char **start, off_t off, int count, int *eof, void *data)
 497 {
 498         ide_drive_t     *drive = (ide_drive_t *) data;
 499         const char      *media;
 500         int             len;
 501
 502         switch (drive->media) {
 503         case ide_disk:          media = "disk\n";       break;
 504         case ide_cdrom:         media = "cdrom\n";      break;
 505         case ide_tape:          media = "tape\n";       break;
 506         case ide_floppy:        media = "floppy\n";     break;
 507         case ide_optical:       media = "optical\n";    break;
 508         default:                media = "UNKNOWN\n";    break;
 509         }
 510         strcpy(page, media);
 511         len = strlen(media);
 512         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 513 }
 514
 515 static ide_proc_entry_t generic_drive_entries[] = {
 516         { "driver",     S_IFREG|S_IRUGO,         proc_ide_read_driver,
 517                                                  proc_ide_write_driver },
 518         { "identify",   S_IFREG|S_IRUSR,         proc_ide_read_identify, NULL },
 519         { "media",      S_IFREG|S_IRUGO,         proc_ide_read_media,    NULL },
 520         { "model",      S_IFREG|S_IRUGO,         proc_ide_read_dmodel,   NULL },
 521         { "settings",   S_IFREG|S_IRUSR|S_IWUSR, proc_ide_read_settings,
 522                                                  proc_ide_write_settings },
 523         { NULL, 0, NULL, NULL }
 524 };
 525
 526 static void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
 527 {
 528         struct proc_dir_entry *ent;
 529
 530         if (!dir || !p)
 531                 return;
 532         while (p->name != NULL) {
 533                 ent = create_proc_entry(p->name, p->mode, dir);
 534                 if (!ent) return;
 535                 ent->data = data;
 536                 ent->read_proc = p->read_proc;
 537                 ent->write_proc = p->write_proc;
 538                 p++;
 539         }
 540 }
 541
 542 static void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
 543 {
 544         if (!dir || !p)
 545                 return;
 546         while (p->name != NULL) {
 547                 remove_proc_entry(p->name, dir);
 548                 p++;
 549         }
 550 }
 551
 552 void ide_proc_register_driver(ide_drive_t *drive, struct ide_driver *driver)
 553 {
 554         mutex_lock(&ide_setting_mtx);
 555         drive->settings = driver->proc_devsets(drive);
 556         mutex_unlock(&ide_setting_mtx);
 557
 558         ide_add_proc_entries(drive->proc, driver->proc_entries(drive), drive);
 559 }
 560
 561 EXPORT_SYMBOL(ide_proc_register_driver);
 562
 563 /**
 564  *      ide_proc_unregister_driver      -       remove driver specific data
 565  *      @drive: drive
 566  *      @driver: driver
 567  *
 568  *      Clean up the driver specific /proc files and IDE settings
 569  *      for a given drive.
 570  *
 571  *      Takes ide_setting_mtx.
 572  */
 573
 574 void ide_proc_unregister_driver(ide_drive_t *drive, struct ide_driver *driver)
 575 {
 576         ide_remove_proc_entries(drive->proc, driver->proc_entries(drive));
 577
 578         mutex_lock(&ide_setting_mtx);
 579         /*
 580          * ide_setting_mtx protects both the settings list and the use
 581          * of settings (we cannot take a setting out that is being used).
 582          */
 583         drive->settings = NULL;
 584         mutex_unlock(&ide_setting_mtx);
 585 }
 586 EXPORT_SYMBOL(ide_proc_unregister_driver);
 587
 588 void ide_proc_port_register_devices(ide_hwif_t *hwif)
 589 {
 590         struct proc_dir_entry *ent;
 591         struct proc_dir_entry *parent = hwif->proc;
 592         ide_drive_t *drive;
 593         char name[64];
 594         int i;
 595
 596         ide_port_for_each_dev(i, drive, hwif) {
 597                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 598                         continue;
 599
 600                 drive->proc = proc_mkdir(drive->name, parent);
 601                 if (drive->proc)
 602                         ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
 603                 sprintf(name, "ide%d/%s", (drive->name[2]-'a')/2, drive->name);
 604                 ent = proc_symlink(drive->name, proc_ide_root, name);
 605                 if (!ent) return;
 606         }
 607 }
 608
 609 void ide_proc_unregister_device(ide_drive_t *drive)
 610 {
 611         if (drive->proc) {
 612                 ide_remove_proc_entries(drive->proc, generic_drive_entries);
 613                 remove_proc_entry(drive->name, proc_ide_root);
 614                 remove_proc_entry(drive->name, drive->hwif->proc);
 615                 drive->proc = NULL;
 616         }
 617 }
 618
 619 static ide_proc_entry_t hwif_entries[] = {
 620         { "channel",    S_IFREG|S_IRUGO,        proc_ide_read_channel,  NULL },
 621         { "mate",       S_IFREG|S_IRUGO,        proc_ide_read_mate,     NULL },
 622         { "model",      S_IFREG|S_IRUGO,        proc_ide_read_imodel,   NULL },
 623         { NULL, 0, NULL, NULL }
 624 };
 625
 626 void ide_proc_register_port(ide_hwif_t *hwif)
 627 {
 628         if (!hwif->proc) {
 629                 hwif->proc = proc_mkdir(hwif->name, proc_ide_root);
 630
 631                 if (!hwif->proc)
 632                         return;
 633
 634                 ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
 635         }
 636 }
 637
 638 void ide_proc_unregister_port(ide_hwif_t *hwif)
 639 {
 640         if (hwif->proc) {
 641                 ide_remove_proc_entries(hwif->proc, hwif_entries);
 642                 remove_proc_entry(hwif->name, proc_ide_root);
 643                 hwif->proc = NULL;
 644         }
 645 }
 646
 647 static int proc_print_driver(struct device_driver *drv, void *data)
 648 {
 649         struct ide_driver *ide_drv = to_ide_driver(drv);
 650         struct seq_file *s = data;
 651
 652         seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);
 653
 654         return 0;
 655 }
 656
 657 static int ide_drivers_show(struct seq_file *s, void *p)
 658 {
 659         int err;
 660
 661         err = bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
 662         if (err < 0)
 663                 printk(KERN_WARNING "IDE: %s: bus_for_each_drv error: %d\n",
 664                         __func__, err);
 665         return 0;
 666 }
 667
 668 static int ide_drivers_open(struct inode *inode, struct file *file)
 669 {
 670         return single_open(file, &ide_drivers_show, NULL);
 671 }
 672
 673 static const struct file_operations ide_drivers_operations = {
 674         .owner          = THIS_MODULE,
 675         .open           = ide_drivers_open,
 676         .read           = seq_read,
 677         .llseek         = seq_lseek,
 678         .release        = single_release,
 679 };
 680
 681 void proc_ide_create(void)
 682 {
 683         proc_ide_root = proc_mkdir("ide", NULL);
 684
 685         if (!proc_ide_root)
 686                 return;
 687
 688         proc_create("drivers", 0, proc_ide_root, &ide_drivers_operations);
 689 }
 690
 691 void proc_ide_destroy(void)
 692 {
 693         remove_proc_entry("drivers", proc_ide_root);
 694         remove_proc_entry("ide", NULL);
 695 }