drivers/ide/ide-proc.c

   1 /*
   2  *  linux/drivers/ide/ide-proc.c        Version 1.05    Mar 05, 2003
   3  *
   4  *  Copyright (C) 1997-1998     Mark Lord
   5  *  Copyright (C) 2003          Red Hat <alan@redhat.com>
   6  */
   7
   8 /*
   9  * This is the /proc/ide/ filesystem implementation.
  10  *
  11  * The major reason this exists is to provide sufficient access
  12  * to driver and config data, such that user-mode programs can
  13  * be developed to handle chipset tuning for most PCI interfaces.
  14  * This should provide better utilities, and less kernel bloat.
  15  *
  16  * The entire pci config space for a PCI interface chipset can be
  17  * retrieved by just reading it.  e.g.    "cat /proc/ide3/config"
  18  *
  19  * To modify registers *safely*, do something like:
  20  *   echo "P40:88" >/proc/ide/ide3/config
  21  * That expression writes 0x88 to pci config register 0x40
  22  * on the chip which controls ide3.  Multiple tuples can be issued,
  23  * and the writes will be completed as an atomic set:
  24  *   echo "P40:88 P41:35 P42:00 P43:00" >/proc/ide/ide3/config
  25  *
  26  * All numbers must be specified using pairs of ascii hex digits.
  27  * It is important to note that these writes will be performed
  28  * after waiting for the IDE controller (both interfaces)
  29  * to be completely idle, to ensure no corruption of I/O in progress.
  30  *
  31  * Non-PCI registers can also be written, using "R" in place of "P"
  32  * in the above examples.  The size of the port transfer is determined
  33  * by the number of pairs of hex digits given for the data.  If a two
  34  * digit value is given, the write will be a byte operation; if four
  35  * digits are used, the write will be performed as a 16-bit operation;
  36  * and if eight digits are specified, a 32-bit "dword" write will be
  37  * performed.  Odd numbers of digits are not permitted.
  38  *
  39  * If there is an error *anywhere* in the string of registers/data
  40  * then *none* of the writes will be performed.
  41  *
  42  * Drive/Driver settings can be retrieved by reading the drive's
  43  * "settings" files.  e.g.    "cat /proc/ide0/hda/settings"
  44  * To write a new value "val" into a specific setting "name", use:
  45  *   echo "name:val" >/proc/ide/ide0/hda/settings
  46  *
  47  * Also useful, "cat /proc/ide0/hda/[identify, smart_values,
  48  * smart_thresholds, capabilities]" will issue an IDENTIFY /
  49  * PACKET_IDENTIFY / SMART_READ_VALUES / SMART_READ_THRESHOLDS /
  50  * SENSE CAPABILITIES command to /dev/hda, and then dump out the
  51  * returned data as 256 16-bit words.  The "hdparm" utility will
  52  * be updated someday soon to use this mechanism.
  53  *
  54  * Feel free to develop and distribute fancy GUI configuration
  55  * utilities for your favorite PCI chipsets.  I'll be working on
  56  * one for the Promise 20246 someday soon.  -ml
  57  *
  58  */
  59
  60 #include <linux/config.h>
  61 #include <linux/module.h>
  62
  63 #include <asm/uaccess.h>
  64 #include <linux/errno.h>
  65 #include <linux/sched.h>
  66 #include <linux/proc_fs.h>
  67 #include <linux/stat.h>
  68 #include <linux/mm.h>
  69 #include <linux/pci.h>
  70 #include <linux/ctype.h>
  71 #include <linux/hdreg.h>
  72 #include <linux/ide.h>
  73 #include <linux/seq_file.h>
  74
  75 #include <asm/io.h>
  76
  77 static int proc_ide_write_config(struct file *file, const char __user *buffer,
  78                                  unsigned long count, void *data)
  79 {
  80         ide_hwif_t      *hwif = (ide_hwif_t *)data;
  81         ide_hwgroup_t *mygroup = (ide_hwgroup_t *)(hwif->hwgroup);
  82         ide_hwgroup_t *mategroup = NULL;
  83         unsigned long timeout;
  84         unsigned long flags;
  85         const char *start = NULL, *msg = NULL;
  86         struct entry { u32 val; u16 reg; u8 size; u8 pci; } *prog, *q, *r;
  87         int want_pci = 0;
  88         char *buf, *s;
  89         int err;
  90
  91         if (hwif->mate && hwif->mate->hwgroup)
  92                 mategroup = (ide_hwgroup_t *)(hwif->mate->hwgroup);
  93
  94         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
  95                 return -EACCES;
  96
  97         if (count >= PAGE_SIZE)
  98                 return -EINVAL;
  99
 100         s = buf = (char *)__get_free_page(GFP_USER);
 101         if (!buf)
 102                 return -ENOMEM;
 103
 104         err = -ENOMEM;
 105         q = prog = (struct entry *)__get_free_page(GFP_USER);
 106         if (!prog)
 107                 goto out;
 108
 109         err = -EFAULT;
 110         if (copy_from_user(buf, buffer, count))
 111                 goto out1;
 112
 113         buf[count] = '\0';
 114
 115         while (isspace(*s))
 116                 s++;
 117
 118         while (*s) {
 119                 char *p;
 120                 int digits;
 121
 122                 start = s;
 123
 124                 if ((char *)(q + 1) > (char *)prog + PAGE_SIZE) {
 125                         msg = "too many entries";
 126                         goto parse_error;
 127                 }
 128
 129                 switch (*s++) {
 130                         case 'R':       q->pci = 0;
 131                                         break;
 132                         case 'P':       q->pci = 1;
 133                                         want_pci = 1;
 134                                         break;
 135                         default:        msg = "expected 'R' or 'P'";
 136                                         goto parse_error;
 137                 }
 138
 139                 q->reg = simple_strtoul(s, &p, 16);
 140                 digits = p - s;
 141                 if (!digits || digits > 4 || (q->pci && q->reg > 0xff)) {
 142                         msg = "bad/missing register number";
 143                         goto parse_error;
 144                 }
 145                 if (*p++ != ':') {
 146                         msg = "missing ':'";
 147                         goto parse_error;
 148                 }
 149                 q->val = simple_strtoul(p, &s, 16);
 150                 digits = s - p;
 151                 if (digits != 2 && digits != 4 && digits != 8) {
 152                         msg = "bad data, 2/4/8 digits required";
 153                         goto parse_error;
 154                 }
 155                 q->size = digits / 2;
 156
 157                 if (q->pci) {
 158 #ifdef CONFIG_BLK_DEV_IDEPCI
 159                         if (q->reg & (q->size - 1)) {
 160                                 msg = "misaligned access";
 161                                 goto parse_error;
 162                         }
 163 #else
 164                         msg = "not a PCI device";
 165                         goto parse_error;
 166 #endif  /* CONFIG_BLK_DEV_IDEPCI */
 167                 }
 168
 169                 q++;
 170
 171                 if (*s && !isspace(*s++)) {
 172                         msg = "expected whitespace after data";
 173                         goto parse_error;
 174                 }
 175                 while (isspace(*s))
 176                         s++;
 177         }
 178
 179         /*
 180          * What follows below is fucking insane, even for IDE people.
 181          * For now I've dealt with the obvious problems on the parsing
 182          * side, but IMNSHO we should simply remove the write access
 183          * to /proc/ide/.../config, killing that FPOS completely.
 184          */
 185
 186         err = -EBUSY;
 187         timeout = jiffies + (3 * HZ);
 188         spin_lock_irqsave(&ide_lock, flags);
 189         while (mygroup->busy ||
 190                (mategroup && mategroup->busy)) {
 191                 spin_unlock_irqrestore(&ide_lock, flags);
 192                 if (time_after(jiffies, timeout)) {
 193                         printk("/proc/ide/%s/config: channel(s) busy, cannot write\n", hwif->name);
 194                         goto out1;
 195                 }
 196                 spin_lock_irqsave(&ide_lock, flags);
 197         }
 198
 199 #ifdef CONFIG_BLK_DEV_IDEPCI
 200         if (want_pci && (!hwif->pci_dev || hwif->pci_dev->vendor)) {
 201                 spin_unlock_irqrestore(&ide_lock, flags);
 202                 printk("proc_ide: PCI registers not accessible for %s\n",
 203                         hwif->name);
 204                 err = -EINVAL;
 205                 goto out1;
 206         }
 207 #endif  /* CONFIG_BLK_DEV_IDEPCI */
 208
 209         for (r = prog; r < q; r++) {
 210                 unsigned int reg = r->reg, val = r->val;
 211                 if (r->pci) {
 212 #ifdef CONFIG_BLK_DEV_IDEPCI
 213                         int rc = 0;
 214                         struct pci_dev *dev = hwif->pci_dev;
 215                         switch (q->size) {
 216                                 case 1: msg = "byte";
 217                                         rc = pci_write_config_byte(dev, reg, val);
 218                                         break;
 219                                 case 2: msg = "word";
 220                                         rc = pci_write_config_word(dev, reg, val);
 221                                         break;
 222                                 case 4: msg = "dword";
 223                                         rc = pci_write_config_dword(dev, reg, val);
 224                                         break;
 225                         }
 226                         if (rc) {
 227                                 spin_unlock_irqrestore(&ide_lock, flags);
 228                                 printk("proc_ide_write_config: error writing %s at bus %02x dev %02x reg 0x%x value 0x%x\n",
 229                                         msg, dev->bus->number, dev->devfn, reg, val);
 230                                 printk("proc_ide_write_config: error %d\n", rc);
 231                                 err = -EIO;
 232                                 goto out1;
 233                         }
 234 #endif  /* CONFIG_BLK_DEV_IDEPCI */
 235                 } else {        /* not pci */
 236                         switch (r->size) {
 237                                 case 1: hwif->OUTB(val, reg);
 238                                         break;
 239                                 case 2: hwif->OUTW(val, reg);
 240                                         break;
 241                                 case 4: hwif->OUTL(val, reg);
 242                                         break;
 243                         }
 244                 }
 245         }
 246         spin_unlock_irqrestore(&ide_lock, flags);
 247         err = count;
 248 out1:
 249         free_page((unsigned long)prog);
 250 out:
 251         free_page((unsigned long)buf);
 252         return err;
 253
 254 parse_error:
 255         printk("parse error\n");
 256         printk("proc_ide: error: %s: '%s'\n", msg, start);
 257         err = -EINVAL;
 258         goto out1;
 259 }
 260
 261 static int proc_ide_read_config
 262         (char *page, char **start, off_t off, int count, int *eof, void *data)
 263 {
 264         char            *out = page;
 265         int             len;
 266
 267 #ifdef CONFIG_BLK_DEV_IDEPCI
 268         ide_hwif_t      *hwif = (ide_hwif_t *)data;
 269         struct pci_dev  *dev = hwif->pci_dev;
 270         if ((hwif->pci_dev && hwif->pci_dev->vendor) && dev && dev->bus) {
 271                 int reg = 0;
 272
 273                 out += sprintf(out, "pci bus %02x device %02x vendor %04x "
 274                                 "device %04x channel %d\n",
 275                         dev->bus->number, dev->devfn,
 276                         hwif->pci_dev->vendor, hwif->pci_dev->device,
 277                         hwif->channel);
 278                 do {
 279                         u8 val;
 280                         int rc = pci_read_config_byte(dev, reg, &val);
 281                         if (rc) {
 282                                 printk("proc_ide_read_config: error %d reading"
 283                                         " bus %02x dev %02x reg 0x%02x\n",
 284                                         rc, dev->bus->number, dev->devfn, reg);
 285                                 out += sprintf(out, "??%c",
 286                                         (++reg & 0xf) ? ' ' : '\n');
 287                         } else
 288                                 out += sprintf(out, "%02x%c",
 289                                         val, (++reg & 0xf) ? ' ' : '\n');
 290                 } while (reg < 0x100);
 291         } else
 292 #endif  /* CONFIG_BLK_DEV_IDEPCI */
 293                 out += sprintf(out, "(none)\n");
 294         len = out - page;
 295         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 296 }
 297
 298 static int proc_ide_read_imodel
 299         (char *page, char **start, off_t off, int count, int *eof, void *data)
 300 {
 301         ide_hwif_t      *hwif = (ide_hwif_t *) data;
 302         int             len;
 303         const char      *name;
 304
 305         /*
 306          * Neither ide_unknown nor ide_forced should be set at this point.
 307          */
 308         switch (hwif->chipset) {
 309                 case ide_generic:       name = "generic";       break;
 310                 case ide_pci:           name = "pci";           break;
 311                 case ide_cmd640:        name = "cmd640";        break;
 312                 case ide_dtc2278:       name = "dtc2278";       break;
 313                 case ide_ali14xx:       name = "ali14xx";       break;
 314                 case ide_qd65xx:        name = "qd65xx";        break;
 315                 case ide_umc8672:       name = "umc8672";       break;
 316                 case ide_ht6560b:       name = "ht6560b";       break;
 317                 case ide_pdc4030:       name = "pdc4030";       break;
 318                 case ide_rz1000:        name = "rz1000";        break;
 319                 case ide_trm290:        name = "trm290";        break;
 320                 case ide_cmd646:        name = "cmd646";        break;
 321                 case ide_cy82c693:      name = "cy82c693";      break;
 322                 case ide_4drives:       name = "4drives";       break;
 323                 case ide_pmac:          name = "mac-io";        break;
 324                 default:                name = "(unknown)";     break;
 325         }
 326         len = sprintf(page, "%s\n", name);
 327         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 328 }
 329
 330 static int proc_ide_read_mate
 331         (char *page, char **start, off_t off, int count, int *eof, void *data)
 332 {
 333         ide_hwif_t      *hwif = (ide_hwif_t *) data;
 334         int             len;
 335
 336         if (hwif && hwif->mate && hwif->mate->present)
 337                 len = sprintf(page, "%s\n", hwif->mate->name);
 338         else
 339                 len = sprintf(page, "(none)\n");
 340         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 341 }
 342
 343 static int proc_ide_read_channel
 344         (char *page, char **start, off_t off, int count, int *eof, void *data)
 345 {
 346         ide_hwif_t      *hwif = (ide_hwif_t *) data;
 347         int             len;
 348
 349         page[0] = hwif->channel ? '1' : '0';
 350         page[1] = '\n';
 351         len = 2;
 352         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 353 }
 354
 355 static int proc_ide_read_identify
 356         (char *page, char **start, off_t off, int count, int *eof, void *data)
 357 {
 358         ide_drive_t     *drive = (ide_drive_t *)data;
 359         int             len = 0, i = 0;
 360         int             err = 0;
 361
 362         len = sprintf(page, "\n");
 363
 364         if (drive)
 365         {
 366                 unsigned short *val = (unsigned short *) page;
 367
 368                 /*
 369                  *      The current code can't handle a driverless
 370                  *      identify query taskfile. Now the right fix is
 371                  *      to add a 'default' driver but that is a bit
 372                  *      more work.
 373                  *
 374                  *      FIXME: this has to be fixed for hotswap devices
 375                  */
 376
 377                 if(DRIVER(drive))
 378                         err = taskfile_lib_get_identify(drive, page);
 379                 else    /* This relies on the ID changes */
 380                         val = (unsigned short *)drive->id;
 381
 382                 if(!err)
 383                 {
 384                         char *out = ((char *)page) + (SECTOR_WORDS * 4);
 385                         page = out;
 386                         do {
 387                                 out += sprintf(out, "%04x%c",
 388                                         le16_to_cpu(*val), (++i & 7) ? ' ' : '\n');
 389                                 val += 1;
 390                         } while (i < (SECTOR_WORDS * 2));
 391                         len = out - page;
 392                 }
 393         }
 394         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 395 }
 396
 397 static int proc_ide_read_settings
 398         (char *page, char **start, off_t off, int count, int *eof, void *data)
 399 {
 400         ide_drive_t     *drive = (ide_drive_t *) data;
 401         ide_settings_t  *setting = (ide_settings_t *) drive->settings;
 402         char            *out = page;
 403         int             len, rc, mul_factor, div_factor;
 404
 405         down(&ide_setting_sem);
 406         out += sprintf(out, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
 407         out += sprintf(out, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
 408         while(setting) {
 409                 mul_factor = setting->mul_factor;
 410                 div_factor = setting->div_factor;
 411                 out += sprintf(out, "%-24s", setting->name);
 412                 if ((rc = ide_read_setting(drive, setting)) >= 0)
 413                         out += sprintf(out, "%-16d", rc * mul_factor / div_factor);
 414                 else
 415                         out += sprintf(out, "%-16s", "write-only");
 416                 out += sprintf(out, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
 417                 if (setting->rw & SETTING_READ)
 418                         out += sprintf(out, "r");
 419                 if (setting->rw & SETTING_WRITE)
 420                         out += sprintf(out, "w");
 421                 out += sprintf(out, "\n");
 422                 setting = setting->next;
 423         }
 424         len = out - page;
 425         up(&ide_setting_sem);
 426         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 427 }
 428
 429 #define MAX_LEN 30
 430
 431 static int proc_ide_write_settings(struct file *file, const char __user *buffer,
 432                                    unsigned long count, void *data)
 433 {
 434         ide_drive_t     *drive = (ide_drive_t *) data;
 435         char            name[MAX_LEN + 1];
 436         int             for_real = 0;
 437         unsigned long   n;
 438         ide_settings_t  *setting;
 439         char *buf, *s;
 440
 441         if (!capable(CAP_SYS_ADMIN))
 442                 return -EACCES;
 443
 444         if (count >= PAGE_SIZE)
 445                 return -EINVAL;
 446
 447         s = buf = (char *)__get_free_page(GFP_USER);
 448         if (!buf)
 449                 return -ENOMEM;
 450
 451         if (copy_from_user(buf, buffer, count)) {
 452                 free_page((unsigned long)buf);
 453                 return -EFAULT;
 454         }
 455
 456         buf[count] = '\0';
 457
 458         /*
 459          * Skip over leading whitespace
 460          */
 461         while (count && isspace(*s)) {
 462                 --count;
 463                 ++s;
 464         }
 465         /*
 466          * Do one full pass to verify all parameters,
 467          * then do another to actually write the new settings.
 468          */
 469         do {
 470                 char *p = s;
 471                 n = count;
 472                 while (n > 0) {
 473                         unsigned val;
 474                         char *q = p;
 475
 476                         while (n > 0 && *p != ':') {
 477                                 --n;
 478                                 p++;
 479                         }
 480                         if (*p != ':')
 481                                 goto parse_error;
 482                         if (p - q > MAX_LEN)
 483                                 goto parse_error;
 484                         memcpy(name, q, p - q);
 485                         name[p - q] = 0;
 486
 487                         if (n > 0) {
 488                                 --n;
 489                                 p++;
 490                         } else
 491                                 goto parse_error;
 492
 493                         val = simple_strtoul(p, &q, 10);
 494                         n -= q - p;
 495                         p = q;
 496                         if (n > 0 && !isspace(*p))
 497                                 goto parse_error;
 498                         while (n > 0 && isspace(*p)) {
 499                                 --n;
 500                                 ++p;
 501                         }
 502
 503                         down(&ide_setting_sem);
 504                         setting = ide_find_setting_by_name(drive, name);
 505                         if (!setting)
 506                         {
 507                                 up(&ide_setting_sem);
 508                                 goto parse_error;
 509                         }
 510                         if (for_real)
 511                                 ide_write_setting(drive, setting, val * setting->div_factor / setting->mul_factor);
 512                         up(&ide_setting_sem);
 513                 }
 514         } while (!for_real++);
 515         free_page((unsigned long)buf);
 516         return count;
 517 parse_error:
 518         free_page((unsigned long)buf);
 519         printk("proc_ide_write_settings(): parse error\n");
 520         return -EINVAL;
 521 }
 522
 523 int proc_ide_read_capacity
 524         (char *page, char **start, off_t off, int count, int *eof, void *data)
 525 {
 526         ide_drive_t     *drive = (ide_drive_t *) data;
 527         int             len;
 528
 529         len = sprintf(page,"%llu\n",
 530                       (long long) (DRIVER(drive)->capacity(drive)));
 531         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 532 }
 533
 534 int proc_ide_read_geometry
 535         (char *page, char **start, off_t off, int count, int *eof, void *data)
 536 {
 537         ide_drive_t     *drive = (ide_drive_t *) data;
 538         char            *out = page;
 539         int             len;
 540
 541         out += sprintf(out,"physical     %d/%d/%d\n",
 542                         drive->cyl, drive->head, drive->sect);
 543         out += sprintf(out,"logical      %d/%d/%d\n",
 544                         drive->bios_cyl, drive->bios_head, drive->bios_sect);
 545
 546         len = out - page;
 547         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 548 }
 549
 550 EXPORT_SYMBOL(proc_ide_read_geometry);
 551
 552 static int proc_ide_read_dmodel
 553         (char *page, char **start, off_t off, int count, int *eof, void *data)
 554 {
 555         ide_drive_t     *drive = (ide_drive_t *) data;
 556         struct hd_driveid *id = drive->id;
 557         int             len;
 558
 559         len = sprintf(page, "%.40s\n",
 560                 (id && id->model[0]) ? (char *)id->model : "(none)");
 561         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 562 }
 563
 564 static int proc_ide_read_driver
 565         (char *page, char **start, off_t off, int count, int *eof, void *data)
 566 {
 567         ide_drive_t     *drive = (ide_drive_t *) data;
 568         ide_driver_t    *driver = drive->driver;
 569         int             len;
 570
 571         len = sprintf(page, "%s version %s\n",
 572                         driver->name, driver->version);
 573         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 574 }
 575
 576 static int proc_ide_write_driver
 577         (struct file *file, const char __user *buffer, unsigned long count, void *data)
 578 {
 579         ide_drive_t     *drive = (ide_drive_t *) data;
 580         char name[32];
 581
 582         if (!capable(CAP_SYS_ADMIN))
 583                 return -EACCES;
 584         if (count > 31)
 585                 count = 31;
 586         if (copy_from_user(name, buffer, count))
 587                 return -EFAULT;
 588         name[count] = '\0';
 589         if (ide_replace_subdriver(drive, name))
 590                 return -EINVAL;
 591         return count;
 592 }
 593
 594 static int proc_ide_read_media
 595         (char *page, char **start, off_t off, int count, int *eof, void *data)
 596 {
 597         ide_drive_t     *drive = (ide_drive_t *) data;
 598         const char      *media;
 599         int             len;
 600
 601         switch (drive->media) {
 602                 case ide_disk:  media = "disk\n";
 603                                 break;
 604                 case ide_cdrom: media = "cdrom\n";
 605                                 break;
 606                 case ide_tape:  media = "tape\n";
 607                                 break;
 608                 case ide_floppy:media = "floppy\n";
 609                                 break;
 610                 default:        media = "UNKNOWN\n";
 611                                 break;
 612         }
 613         strcpy(page,media);
 614         len = strlen(media);
 615         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 616 }
 617
 618 static ide_proc_entry_t generic_drive_entries[] = {
 619         { "driver",     S_IFREG|S_IRUGO,        proc_ide_read_driver,   proc_ide_write_driver },
 620         { "identify",   S_IFREG|S_IRUSR,        proc_ide_read_identify, NULL },
 621         { "media",      S_IFREG|S_IRUGO,        proc_ide_read_media,    NULL },
 622         { "model",      S_IFREG|S_IRUGO,        proc_ide_read_dmodel,   NULL },
 623         { "settings",   S_IFREG|S_IRUSR|S_IWUSR,proc_ide_read_settings, proc_ide_write_settings },
 624         { NULL, 0, NULL, NULL }
 625 };
 626
 627 void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
 628 {
 629         struct proc_dir_entry *ent;
 630
 631         if (!dir || !p)
 632                 return;
 633         while (p->name != NULL) {
 634                 ent = create_proc_entry(p->name, p->mode, dir);
 635                 if (!ent) return;
 636                 ent->nlink = 1;
 637                 ent->data = data;
 638                 ent->read_proc = p->read_proc;
 639                 ent->write_proc = p->write_proc;
 640                 p++;
 641         }
 642 }
 643
 644 void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
 645 {
 646         if (!dir || !p)
 647                 return;
 648         while (p->name != NULL) {
 649                 remove_proc_entry(p->name, dir);
 650                 p++;
 651         }
 652 }
 653
 654 static void create_proc_ide_drives(ide_hwif_t *hwif)
 655 {
 656         int     d;
 657         struct proc_dir_entry *ent;
 658         struct proc_dir_entry *parent = hwif->proc;
 659         char name[64];
 660
 661         for (d = 0; d < MAX_DRIVES; d++) {
 662                 ide_drive_t *drive = &hwif->drives[d];
 663
 664                 if (!drive->present)
 665                         continue;
 666                 if (drive->proc)
 667                         continue;
 668
 669                 drive->proc = proc_mkdir(drive->name, parent);
 670                 if (drive->proc)
 671                         ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
 672                 sprintf(name,"ide%d/%s", (drive->name[2]-'a')/2, drive->name);
 673                 ent = proc_symlink(drive->name, proc_ide_root, name);
 674                 if (!ent) return;
 675         }
 676 }
 677
 678 static void destroy_proc_ide_device(ide_hwif_t *hwif, ide_drive_t *drive)
 679 {
 680         ide_driver_t *driver = drive->driver;
 681
 682         if (drive->proc) {
 683                 ide_remove_proc_entries(drive->proc, driver->proc);
 684                 ide_remove_proc_entries(drive->proc, generic_drive_entries);
 685                 remove_proc_entry(drive->name, proc_ide_root);
 686                 remove_proc_entry(drive->name, hwif->proc);
 687                 drive->proc = NULL;
 688         }
 689 }
 690
 691 void destroy_proc_ide_drives(ide_hwif_t *hwif)
 692 {
 693         int     d;
 694
 695         for (d = 0; d < MAX_DRIVES; d++) {
 696                 ide_drive_t *drive = &hwif->drives[d];
 697                 if (drive->proc)
 698                         destroy_proc_ide_device(hwif, drive);
 699         }
 700 }
 701
 702 static ide_proc_entry_t hwif_entries[] = {
 703         { "channel",    S_IFREG|S_IRUGO,        proc_ide_read_channel,  NULL },
 704         { "config",     S_IFREG|S_IRUGO|S_IWUSR,proc_ide_read_config,   proc_ide_write_config },
 705         { "mate",       S_IFREG|S_IRUGO,        proc_ide_read_mate,     NULL },
 706         { "model",      S_IFREG|S_IRUGO,        proc_ide_read_imodel,   NULL },
 707         { NULL, 0, NULL, NULL }
 708 };
 709
 710 void create_proc_ide_interfaces(void)
 711 {
 712         int     h;
 713
 714         for (h = 0; h < MAX_HWIFS; h++) {
 715                 ide_hwif_t *hwif = &ide_hwifs[h];
 716
 717                 if (!hwif->present)
 718                         continue;
 719                 if (!hwif->proc) {
 720                         hwif->proc = proc_mkdir(hwif->name, proc_ide_root);
 721                         if (!hwif->proc)
 722                                 return;
 723                         ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
 724                 }
 725                 create_proc_ide_drives(hwif);
 726         }
 727 }
 728
 729 EXPORT_SYMBOL(create_proc_ide_interfaces);
 730
 731 #ifdef CONFIG_BLK_DEV_IDEPCI
 732 void ide_pci_create_host_proc(const char *name, get_info_t *get_info)
 733 {
 734         create_proc_info_entry(name, 0, proc_ide_root, get_info);
 735 }
 736
 737 EXPORT_SYMBOL_GPL(ide_pci_create_host_proc);
 738 #endif
 739
 740 void destroy_proc_ide_interfaces(void)
 741 {
 742         int     h;
 743
 744         for (h = 0; h < MAX_HWIFS; h++) {
 745                 ide_hwif_t *hwif = &ide_hwifs[h];
 746                 int exist = (hwif->proc != NULL);
 747 #if 0
 748                 if (!hwif->present)
 749                         continue;
 750 #endif
 751                 if (exist) {
 752                         destroy_proc_ide_drives(hwif);
 753                         ide_remove_proc_entries(hwif->proc, hwif_entries);
 754                         remove_proc_entry(hwif->name, proc_ide_root);
 755                         hwif->proc = NULL;
 756                 } else
 757                         continue;
 758         }
 759 }
 760
 761 EXPORT_SYMBOL(destroy_proc_ide_interfaces);
 762
 763 extern struct seq_operations ide_drivers_op;
 764 static int ide_drivers_open(struct inode *inode, struct file *file)
 765 {
 766         return seq_open(file, &ide_drivers_op);
 767 }
 768 static struct file_operations ide_drivers_operations = {
 769         .open           = ide_drivers_open,
 770         .read           = seq_read,
 771         .llseek         = seq_lseek,
 772         .release        = seq_release,
 773 };
 774
 775 void proc_ide_create(void)
 776 {
 777         struct proc_dir_entry *entry;
 778
 779         if (!proc_ide_root)
 780                 return;
 781
 782         create_proc_ide_interfaces();
 783
 784         entry = create_proc_entry("drivers", 0, proc_ide_root);
 785         if (entry)
 786                 entry->proc_fops = &ide_drivers_operations;
 787 }
 788
 789 void proc_ide_destroy(void)
 790 {
 791         remove_proc_entry("ide/drivers", proc_ide_root);
 792         destroy_proc_ide_interfaces();
 793         remove_proc_entry("ide", NULL);
 794 }