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_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         int err;
 199
 200         if (arg < XFER_PIO_0 || arg > XFER_UDMA_6)
 201                 return -EINVAL;
 202
 203         memset(&cmd, 0, sizeof(cmd));
 204         cmd.tf.command = ATA_CMD_SET_FEATURES;
 205         cmd.tf.feature = SETFEATURES_XFER;
 206         cmd.tf.nsect   = (u8)arg;
 207         cmd.tf_flags   = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT |
 208                          IDE_TFLAG_IN_NSECT;
 209
 210         err = ide_no_data_taskfile(drive, &cmd);
 211
 212         if (!err) {
 213                 ide_set_xfer_rate(drive, (u8) arg);
 214                 ide_driveid_update(drive);
 215         }
 216         return err;
 217 }
 218
 219 ide_devset_rw(current_speed, xfer_rate);
 220 ide_devset_rw_field(init_speed, init_speed);
 221 ide_devset_rw_flag(nice1, IDE_DFLAG_NICE1);
 222 ide_devset_rw_field(number, dn);
 223
 224 static const struct ide_proc_devset ide_generic_settings[] = {
 225         IDE_PROC_DEVSET(current_speed, 0, 70),
 226         IDE_PROC_DEVSET(init_speed, 0, 70),
 227         IDE_PROC_DEVSET(io_32bit,  0, 1 + (SUPPORT_VLB_SYNC << 1)),
 228         IDE_PROC_DEVSET(keepsettings, 0, 1),
 229         IDE_PROC_DEVSET(nice1, 0, 1),
 230         IDE_PROC_DEVSET(number, 0, 3),
 231         IDE_PROC_DEVSET(pio_mode, 0, 255),
 232         IDE_PROC_DEVSET(unmaskirq, 0, 1),
 233         IDE_PROC_DEVSET(using_dma, 0, 1),
 234         { NULL },
 235 };
 236
 237 static void proc_ide_settings_warn(void)
 238 {
 239         static int warned;
 240
 241         if (warned)
 242                 return;
 243
 244         printk(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "
 245                             "obsolete, and will be removed soon!\n");
 246         warned = 1;
 247 }
 248
 249 static int proc_ide_read_settings
 250         (char *page, char **start, off_t off, int count, int *eof, void *data)
 251 {
 252         const struct ide_proc_devset *setting, *g, *d;
 253         const struct ide_devset *ds;
 254         ide_drive_t     *drive = (ide_drive_t *) data;
 255         char            *out = page;
 256         int             len, rc, mul_factor, div_factor;
 257
 258         proc_ide_settings_warn();
 259
 260         mutex_lock(&ide_setting_mtx);
 261         g = ide_generic_settings;
 262         d = drive->settings;
 263         out += sprintf(out, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
 264         out += sprintf(out, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
 265         while (g->name || (d && d->name)) {
 266                 /* read settings in the alphabetical order */
 267                 if (g->name && d && d->name) {
 268                         if (strcmp(d->name, g->name) < 0)
 269                                 setting = d++;
 270                         else
 271                                 setting = g++;
 272                 } else if (d && d->name) {
 273                         setting = d++;
 274                 } else
 275                         setting = g++;
 276                 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
 277                 div_factor = setting->divf ? setting->divf(drive) : 1;
 278                 out += sprintf(out, "%-24s", setting->name);
 279                 rc = ide_read_setting(drive, setting);
 280                 if (rc >= 0)
 281                         out += sprintf(out, "%-16d", rc * mul_factor / div_factor);
 282                 else
 283                         out += sprintf(out, "%-16s", "write-only");
 284                 out += sprintf(out, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
 285                 ds = setting->setting;
 286                 if (ds->get)
 287                         out += sprintf(out, "r");
 288                 if (ds->set)
 289                         out += sprintf(out, "w");
 290                 out += sprintf(out, "\n");
 291         }
 292         len = out - page;
 293         mutex_unlock(&ide_setting_mtx);
 294         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 295 }
 296
 297 #define MAX_LEN 30
 298
 299 static int proc_ide_write_settings(struct file *file, const char __user *buffer,
 300                                    unsigned long count, void *data)
 301 {
 302         ide_drive_t     *drive = (ide_drive_t *) data;
 303         char            name[MAX_LEN + 1];
 304         int             for_real = 0, mul_factor, div_factor;
 305         unsigned long   n;
 306
 307         const struct ide_proc_devset *setting;
 308         char *buf, *s;
 309
 310         if (!capable(CAP_SYS_ADMIN))
 311                 return -EACCES;
 312
 313         proc_ide_settings_warn();
 314
 315         if (count >= PAGE_SIZE)
 316                 return -EINVAL;
 317
 318         s = buf = (char *)__get_free_page(GFP_USER);
 319         if (!buf)
 320                 return -ENOMEM;
 321
 322         if (copy_from_user(buf, buffer, count)) {
 323                 free_page((unsigned long)buf);
 324                 return -EFAULT;
 325         }
 326
 327         buf[count] = '\0';
 328
 329         /*
 330          * Skip over leading whitespace
 331          */
 332         while (count && isspace(*s)) {
 333                 --count;
 334                 ++s;
 335         }
 336         /*
 337          * Do one full pass to verify all parameters,
 338          * then do another to actually write the new settings.
 339          */
 340         do {
 341                 char *p = s;
 342                 n = count;
 343                 while (n > 0) {
 344                         unsigned val;
 345                         char *q = p;
 346
 347                         while (n > 0 && *p != ':') {
 348                                 --n;
 349                                 p++;
 350                         }
 351                         if (*p != ':')
 352                                 goto parse_error;
 353                         if (p - q > MAX_LEN)
 354                                 goto parse_error;
 355                         memcpy(name, q, p - q);
 356                         name[p - q] = 0;
 357
 358                         if (n > 0) {
 359                                 --n;
 360                                 p++;
 361                         } else
 362                                 goto parse_error;
 363
 364                         val = simple_strtoul(p, &q, 10);
 365                         n -= q - p;
 366                         p = q;
 367                         if (n > 0 && !isspace(*p))
 368                                 goto parse_error;
 369                         while (n > 0 && isspace(*p)) {
 370                                 --n;
 371                                 ++p;
 372                         }
 373
 374                         mutex_lock(&ide_setting_mtx);
 375                         /* generic settings first, then driver specific ones */
 376                         setting = ide_find_setting(ide_generic_settings, name);
 377                         if (!setting) {
 378                                 if (drive->settings)
 379                                         setting = ide_find_setting(drive->settings, name);
 380                                 if (!setting) {
 381                                         mutex_unlock(&ide_setting_mtx);
 382                                         goto parse_error;
 383                                 }
 384                         }
 385                         if (for_real) {
 386                                 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
 387                                 div_factor = setting->divf ? setting->divf(drive) : 1;
 388                                 ide_write_setting(drive, setting, val * div_factor / mul_factor);
 389                         }
 390                         mutex_unlock(&ide_setting_mtx);
 391                 }
 392         } while (!for_real++);
 393         free_page((unsigned long)buf);
 394         return count;
 395 parse_error:
 396         free_page((unsigned long)buf);
 397         printk("proc_ide_write_settings(): parse error\n");
 398         return -EINVAL;
 399 }
 400
 401 int proc_ide_read_capacity
 402         (char *page, char **start, off_t off, int count, int *eof, void *data)
 403 {
 404         int len = sprintf(page, "%llu\n", (long long)0x7fffffff);
 405         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 406 }
 407
 408 EXPORT_SYMBOL_GPL(proc_ide_read_capacity);
 409
 410 int proc_ide_read_geometry
 411         (char *page, char **start, off_t off, int count, int *eof, void *data)
 412 {
 413         ide_drive_t     *drive = (ide_drive_t *) data;
 414         char            *out = page;
 415         int             len;
 416
 417         out += sprintf(out, "physical     %d/%d/%d\n",
 418                         drive->cyl, drive->head, drive->sect);
 419         out += sprintf(out, "logical      %d/%d/%d\n",
 420                         drive->bios_cyl, drive->bios_head, drive->bios_sect);
 421
 422         len = out - page;
 423         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 424 }
 425
 426 EXPORT_SYMBOL(proc_ide_read_geometry);
 427
 428 static int proc_ide_read_dmodel
 429         (char *page, char **start, off_t off, int count, int *eof, void *data)
 430 {
 431         ide_drive_t     *drive = (ide_drive_t *) data;
 432         char            *m = (char *)&drive->id[ATA_ID_PROD];
 433         int             len;
 434
 435         len = sprintf(page, "%.40s\n", m[0] ? m : "(none)");
 436         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 437 }
 438
 439 static int proc_ide_read_driver
 440         (char *page, char **start, off_t off, int count, int *eof, void *data)
 441 {
 442         ide_drive_t             *drive = (ide_drive_t *)data;
 443         struct device           *dev = &drive->gendev;
 444         struct ide_driver       *ide_drv;
 445         int                     len;
 446
 447         if (dev->driver) {
 448                 ide_drv = to_ide_driver(dev->driver);
 449                 len = sprintf(page, "%s version %s\n",
 450                                 dev->driver->name, ide_drv->version);
 451         } else
 452                 len = sprintf(page, "ide-default version 0.9.newide\n");
 453         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 454 }
 455
 456 static int ide_replace_subdriver(ide_drive_t *drive, const char *driver)
 457 {
 458         struct device *dev = &drive->gendev;
 459         int ret = 1;
 460         int err;
 461
 462         device_release_driver(dev);
 463         /* FIXME: device can still be in use by previous driver */
 464         strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
 465         err = device_attach(dev);
 466         if (err < 0)
 467                 printk(KERN_WARNING "IDE: %s: device_attach error: %d\n",
 468                         __func__, err);
 469         drive->driver_req[0] = 0;
 470         if (dev->driver == NULL) {
 471                 err = device_attach(dev);
 472                 if (err < 0)
 473                         printk(KERN_WARNING
 474                                 "IDE: %s: device_attach(2) error: %d\n",
 475                                 __func__, err);
 476         }
 477         if (dev->driver && !strcmp(dev->driver->name, driver))
 478                 ret = 0;
 479
 480         return ret;
 481 }
 482
 483 static int proc_ide_write_driver
 484         (struct file *file, const char __user *buffer, unsigned long count, void *data)
 485 {
 486         ide_drive_t     *drive = (ide_drive_t *) data;
 487         char name[32];
 488
 489         if (!capable(CAP_SYS_ADMIN))
 490                 return -EACCES;
 491         if (count > 31)
 492                 count = 31;
 493         if (copy_from_user(name, buffer, count))
 494                 return -EFAULT;
 495         name[count] = '\0';
 496         if (ide_replace_subdriver(drive, name))
 497                 return -EINVAL;
 498         return count;
 499 }
 500
 501 static int proc_ide_read_media
 502         (char *page, char **start, off_t off, int count, int *eof, void *data)
 503 {
 504         ide_drive_t     *drive = (ide_drive_t *) data;
 505         const char      *media;
 506         int             len;
 507
 508         switch (drive->media) {
 509         case ide_disk:          media = "disk\n";       break;
 510         case ide_cdrom:         media = "cdrom\n";      break;
 511         case ide_tape:          media = "tape\n";       break;
 512         case ide_floppy:        media = "floppy\n";     break;
 513         case ide_optical:       media = "optical\n";    break;
 514         default:                media = "UNKNOWN\n";    break;
 515         }
 516         strcpy(page, media);
 517         len = strlen(media);
 518         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 519 }
 520
 521 static ide_proc_entry_t generic_drive_entries[] = {
 522         { "driver",     S_IFREG|S_IRUGO,         proc_ide_read_driver,
 523                                                  proc_ide_write_driver },
 524         { "identify",   S_IFREG|S_IRUSR,         proc_ide_read_identify, NULL },
 525         { "media",      S_IFREG|S_IRUGO,         proc_ide_read_media,    NULL },
 526         { "model",      S_IFREG|S_IRUGO,         proc_ide_read_dmodel,   NULL },
 527         { "settings",   S_IFREG|S_IRUSR|S_IWUSR, proc_ide_read_settings,
 528                                                  proc_ide_write_settings },
 529         { NULL, 0, NULL, NULL }
 530 };
 531
 532 static void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
 533 {
 534         struct proc_dir_entry *ent;
 535
 536         if (!dir || !p)
 537                 return;
 538         while (p->name != NULL) {
 539                 ent = create_proc_entry(p->name, p->mode, dir);
 540                 if (!ent) return;
 541                 ent->data = data;
 542                 ent->read_proc = p->read_proc;
 543                 ent->write_proc = p->write_proc;
 544                 p++;
 545         }
 546 }
 547
 548 static void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
 549 {
 550         if (!dir || !p)
 551                 return;
 552         while (p->name != NULL) {
 553                 remove_proc_entry(p->name, dir);
 554                 p++;
 555         }
 556 }
 557
 558 void ide_proc_register_driver(ide_drive_t *drive, struct ide_driver *driver)
 559 {
 560         mutex_lock(&ide_setting_mtx);
 561         drive->settings = driver->proc_devsets(drive);
 562         mutex_unlock(&ide_setting_mtx);
 563
 564         ide_add_proc_entries(drive->proc, driver->proc_entries(drive), drive);
 565 }
 566
 567 EXPORT_SYMBOL(ide_proc_register_driver);
 568
 569 /**
 570  *      ide_proc_unregister_driver      -       remove driver specific data
 571  *      @drive: drive
 572  *      @driver: driver
 573  *
 574  *      Clean up the driver specific /proc files and IDE settings
 575  *      for a given drive.
 576  *
 577  *      Takes ide_setting_mtx.
 578  */
 579
 580 void ide_proc_unregister_driver(ide_drive_t *drive, struct ide_driver *driver)
 581 {
 582         ide_remove_proc_entries(drive->proc, driver->proc_entries(drive));
 583
 584         mutex_lock(&ide_setting_mtx);
 585         /*
 586          * ide_setting_mtx protects both the settings list and the use
 587          * of settings (we cannot take a setting out that is being used).
 588          */
 589         drive->settings = NULL;
 590         mutex_unlock(&ide_setting_mtx);
 591 }
 592 EXPORT_SYMBOL(ide_proc_unregister_driver);
 593
 594 void ide_proc_port_register_devices(ide_hwif_t *hwif)
 595 {
 596         struct proc_dir_entry *ent;
 597         struct proc_dir_entry *parent = hwif->proc;
 598         ide_drive_t *drive;
 599         char name[64];
 600         int i;
 601
 602         ide_port_for_each_dev(i, drive, hwif) {
 603                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 604                         continue;
 605
 606                 drive->proc = proc_mkdir(drive->name, parent);
 607                 if (drive->proc)
 608                         ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
 609                 sprintf(name, "ide%d/%s", (drive->name[2]-'a')/2, drive->name);
 610                 ent = proc_symlink(drive->name, proc_ide_root, name);
 611                 if (!ent) return;
 612         }
 613 }
 614
 615 void ide_proc_unregister_device(ide_drive_t *drive)
 616 {
 617         if (drive->proc) {
 618                 ide_remove_proc_entries(drive->proc, generic_drive_entries);
 619                 remove_proc_entry(drive->name, proc_ide_root);
 620                 remove_proc_entry(drive->name, drive->hwif->proc);
 621                 drive->proc = NULL;
 622         }
 623 }
 624
 625 static ide_proc_entry_t hwif_entries[] = {
 626         { "channel",    S_IFREG|S_IRUGO,        proc_ide_read_channel,  NULL },
 627         { "mate",       S_IFREG|S_IRUGO,        proc_ide_read_mate,     NULL },
 628         { "model",      S_IFREG|S_IRUGO,        proc_ide_read_imodel,   NULL },
 629         { NULL, 0, NULL, NULL }
 630 };
 631
 632 void ide_proc_register_port(ide_hwif_t *hwif)
 633 {
 634         if (!hwif->proc) {
 635                 hwif->proc = proc_mkdir(hwif->name, proc_ide_root);
 636
 637                 if (!hwif->proc)
 638                         return;
 639
 640                 ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
 641         }
 642 }
 643
 644 void ide_proc_unregister_port(ide_hwif_t *hwif)
 645 {
 646         if (hwif->proc) {
 647                 ide_remove_proc_entries(hwif->proc, hwif_entries);
 648                 remove_proc_entry(hwif->name, proc_ide_root);
 649                 hwif->proc = NULL;
 650         }
 651 }
 652
 653 static int proc_print_driver(struct device_driver *drv, void *data)
 654 {
 655         struct ide_driver *ide_drv = to_ide_driver(drv);
 656         struct seq_file *s = data;
 657
 658         seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);
 659
 660         return 0;
 661 }
 662
 663 static int ide_drivers_show(struct seq_file *s, void *p)
 664 {
 665         int err;
 666
 667         err = bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
 668         if (err < 0)
 669                 printk(KERN_WARNING "IDE: %s: bus_for_each_drv error: %d\n",
 670                         __func__, err);
 671         return 0;
 672 }
 673
 674 static int ide_drivers_open(struct inode *inode, struct file *file)
 675 {
 676         return single_open(file, &ide_drivers_show, NULL);
 677 }
 678
 679 static const struct file_operations ide_drivers_operations = {
 680         .owner          = THIS_MODULE,
 681         .open           = ide_drivers_open,
 682         .read           = seq_read,
 683         .llseek         = seq_lseek,
 684         .release        = single_release,
 685 };
 686
 687 void proc_ide_create(void)
 688 {
 689         proc_ide_root = proc_mkdir("ide", NULL);
 690
 691         if (!proc_ide_root)
 692                 return;
 693
 694         proc_create("drivers", 0, proc_ide_root, &ide_drivers_operations);
 695 }
 696
 697 void proc_ide_destroy(void)
 698 {
 699         remove_proc_entry("drivers", proc_ide_root);
 700         remove_proc_entry("ide", NULL);
 701 }