err.no Git - linux-2.6/blob - drivers/ide/ide-proc.c

   1 /*
   2  *  Copyright (C) 1997-1998     Mark Lord
   3  *  Copyright (C) 2003          Red Hat <alan@redhat.com>
   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  * Also useful, "cat /proc/ide0/hda/[identify, smart_values,
  17  * smart_thresholds, capabilities]" will issue an IDENTIFY /
  18  * PACKET_IDENTIFY / SMART_READ_VALUES / SMART_READ_THRESHOLDS /
  19  * SENSE CAPABILITIES command to /dev/hda, and then dump out the
  20  * returned data as 256 16-bit words.  The "hdparm" utility will
  21  * be updated someday soon to use this mechanism.
  22  *
  23  */
  24
  25 #include <linux/module.h>
  26
  27 #include <asm/uaccess.h>
  28 #include <linux/errno.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/stat.h>
  31 #include <linux/mm.h>
  32 #include <linux/pci.h>
  33 #include <linux/ctype.h>
  34 #include <linux/hdreg.h>
  35 #include <linux/ide.h>
  36 #include <linux/seq_file.h>
  37
  38 #include <asm/io.h>
  39
  40 static struct proc_dir_entry *proc_ide_root;
  41
  42 static int proc_ide_read_imodel
  43         (char *page, char **start, off_t off, int count, int *eof, void *data)
  44 {
  45         ide_hwif_t      *hwif = (ide_hwif_t *) data;
  46         int             len;
  47         const char      *name;
  48
  49         switch (hwif->chipset) {
  50         case ide_generic:       name = "generic";       break;
  51         case ide_pci:           name = "pci";           break;
  52         case ide_cmd640:        name = "cmd640";        break;
  53         case ide_dtc2278:       name = "dtc2278";       break;
  54         case ide_ali14xx:       name = "ali14xx";       break;
  55         case ide_qd65xx:        name = "qd65xx";        break;
  56         case ide_umc8672:       name = "umc8672";       break;
  57         case ide_ht6560b:       name = "ht6560b";       break;
  58         case ide_rz1000:        name = "rz1000";        break;
  59         case ide_trm290:        name = "trm290";        break;
  60         case ide_cmd646:        name = "cmd646";        break;
  61         case ide_cy82c693:      name = "cy82c693";      break;
  62         case ide_4drives:       name = "4drives";       break;
  63         case ide_pmac:          name = "mac-io";        break;
  64         case ide_au1xxx:        name = "au1xxx";        break;
  65         case ide_palm3710:      name = "palm3710";      break;
  66         case ide_etrax100:      name = "etrax100";      break;
  67         case ide_acorn:         name = "acorn";         break;
  68         default:                name = "(unknown)";     break;
  69         }
  70         len = sprintf(page, "%s\n", name);
  71         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  72 }
  73
  74 static int proc_ide_read_mate
  75         (char *page, char **start, off_t off, int count, int *eof, void *data)
  76 {
  77         ide_hwif_t      *hwif = (ide_hwif_t *) data;
  78         int             len;
  79
  80         if (hwif && hwif->mate && hwif->mate->present)
  81                 len = sprintf(page, "%s\n", hwif->mate->name);
  82         else
  83                 len = sprintf(page, "(none)\n");
  84         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  85 }
  86
  87 static int proc_ide_read_channel
  88         (char *page, char **start, off_t off, int count, int *eof, void *data)
  89 {
  90         ide_hwif_t      *hwif = (ide_hwif_t *) data;
  91         int             len;
  92
  93         page[0] = hwif->channel ? '1' : '0';
  94         page[1] = '\n';
  95         len = 2;
  96         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  97 }
  98
  99 static int proc_ide_read_identify
 100         (char *page, char **start, off_t off, int count, int *eof, void *data)
 101 {
 102         ide_drive_t     *drive = (ide_drive_t *)data;
 103         int             len = 0, i = 0;
 104         int             err = 0;
 105
 106         len = sprintf(page, "\n");
 107
 108         if (drive) {
 109                 unsigned short *val = (unsigned short *) page;
 110
 111                 err = taskfile_lib_get_identify(drive, page);
 112                 if (!err) {
 113                         char *out = ((char *)page) + (SECTOR_WORDS * 4);
 114                         page = out;
 115                         do {
 116                                 out += sprintf(out, "%04x%c",
 117                                         le16_to_cpu(*val), (++i & 7) ? ' ' : '\n');
 118                                 val += 1;
 119                         } while (i < (SECTOR_WORDS * 2));
 120                         len = out - page;
 121                 }
 122         }
 123         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 124 }
 125
 126 /**
 127  *      __ide_add_setting       -       add an ide setting option
 128  *      @drive: drive to use
 129  *      @name: setting name
 130  *      @rw: true if the function is read write
 131  *      @data_type: type of data
 132  *      @min: range minimum
 133  *      @max: range maximum
 134  *      @mul_factor: multiplication scale
 135  *      @div_factor: divison scale
 136  *      @data: private data field
 137  *      @set: setting
 138  *      @auto_remove: setting auto removal flag
 139  *
 140  *      Removes the setting named from the device if it is present.
 141  *      The function takes the settings_lock to protect against
 142  *      parallel changes. This function must not be called from IRQ
 143  *      context. Returns 0 on success or -1 on failure.
 144  *
 145  *      BUGS: This code is seriously over-engineered. There is also
 146  *      magic about how the driver specific features are setup. If
 147  *      a driver is attached we assume the driver settings are auto
 148  *      remove.
 149  */
 150
 151 static int __ide_add_setting(ide_drive_t *drive, const char *name, int rw, int data_type, int min, int max, int mul_factor, int div_factor, void *data, ide_procset_t *set, int auto_remove)
 152 {
 153         ide_settings_t **p = (ide_settings_t **) &drive->settings, *setting = NULL;
 154
 155         mutex_lock(&ide_setting_mtx);
 156         while ((*p) && strcmp((*p)->name, name) < 0)
 157                 p = &((*p)->next);
 158         if ((setting = kzalloc(sizeof(*setting), GFP_KERNEL)) == NULL)
 159                 goto abort;
 160         if ((setting->name = kmalloc(strlen(name) + 1, GFP_KERNEL)) == NULL)
 161                 goto abort;
 162         strcpy(setting->name, name);
 163         setting->rw = rw;
 164         setting->data_type = data_type;
 165         setting->min = min;
 166         setting->max = max;
 167         setting->mul_factor = mul_factor;
 168         setting->div_factor = div_factor;
 169         setting->data = data;
 170         setting->set = set;
 171
 172         setting->next = *p;
 173         if (auto_remove)
 174                 setting->auto_remove = 1;
 175         *p = setting;
 176         mutex_unlock(&ide_setting_mtx);
 177         return 0;
 178 abort:
 179         mutex_unlock(&ide_setting_mtx);
 180         kfree(setting);
 181         return -1;
 182 }
 183
 184 int ide_add_setting(ide_drive_t *drive, const char *name, int rw, int data_type, int min, int max, int mul_factor, int div_factor, void *data, ide_procset_t *set)
 185 {
 186         return __ide_add_setting(drive, name, rw, data_type, min, max, mul_factor, div_factor, data, set, 1);
 187 }
 188
 189 EXPORT_SYMBOL(ide_add_setting);
 190
 191 /**
 192  *      __ide_remove_setting    -       remove an ide setting option
 193  *      @drive: drive to use
 194  *      @name: setting name
 195  *
 196  *      Removes the setting named from the device if it is present.
 197  *      The caller must hold the setting semaphore.
 198  */
 199
 200 static void __ide_remove_setting(ide_drive_t *drive, char *name)
 201 {
 202         ide_settings_t **p, *setting;
 203
 204         p = (ide_settings_t **) &drive->settings;
 205
 206         while ((*p) && strcmp((*p)->name, name))
 207                 p = &((*p)->next);
 208         setting = (*p);
 209         if (setting == NULL)
 210                 return;
 211
 212         (*p) = setting->next;
 213
 214         kfree(setting->name);
 215         kfree(setting);
 216 }
 217
 218 /**
 219  *      auto_remove_settings    -       remove driver specific settings
 220  *      @drive: drive
 221  *
 222  *      Automatically remove all the driver specific settings for this
 223  *      drive. This function may not be called from IRQ context. The
 224  *      caller must hold ide_setting_mtx.
 225  */
 226
 227 static void auto_remove_settings(ide_drive_t *drive)
 228 {
 229         ide_settings_t *setting;
 230 repeat:
 231         setting = drive->settings;
 232         while (setting) {
 233                 if (setting->auto_remove) {
 234                         __ide_remove_setting(drive, setting->name);
 235                         goto repeat;
 236                 }
 237                 setting = setting->next;
 238         }
 239 }
 240
 241 /**
 242  *      ide_find_setting_by_name        -       find a drive specific setting
 243  *      @drive: drive to scan
 244  *      @name: setting name
 245  *
 246  *      Scan's the device setting table for a matching entry and returns
 247  *      this or NULL if no entry is found. The caller must hold the
 248  *      setting semaphore
 249  */
 250
 251 static ide_settings_t *ide_find_setting_by_name(ide_drive_t *drive, char *name)
 252 {
 253         ide_settings_t *setting = drive->settings;
 254
 255         while (setting) {
 256                 if (strcmp(setting->name, name) == 0)
 257                         break;
 258                 setting = setting->next;
 259         }
 260         return setting;
 261 }
 262
 263 /**
 264  *      ide_read_setting        -       read an IDE setting
 265  *      @drive: drive to read from
 266  *      @setting: drive setting
 267  *
 268  *      Read a drive setting and return the value. The caller
 269  *      must hold the ide_setting_mtx when making this call.
 270  *
 271  *      BUGS: the data return and error are the same return value
 272  *      so an error -EINVAL and true return of the same value cannot
 273  *      be told apart
 274  */
 275
 276 static int ide_read_setting(ide_drive_t *drive, ide_settings_t *setting)
 277 {
 278         int             val = -EINVAL;
 279         unsigned long   flags;
 280
 281         if ((setting->rw & SETTING_READ)) {
 282                 spin_lock_irqsave(&ide_lock, flags);
 283                 switch (setting->data_type) {
 284                 case TYPE_BYTE:
 285                         val = *((u8 *) setting->data);
 286                         break;
 287                 case TYPE_SHORT:
 288                         val = *((u16 *) setting->data);
 289                         break;
 290                 case TYPE_INT:
 291                         val = *((u32 *) setting->data);
 292                         break;
 293                 }
 294                 spin_unlock_irqrestore(&ide_lock, flags);
 295         }
 296         return val;
 297 }
 298
 299 /**
 300  *      ide_write_setting       -       read an IDE setting
 301  *      @drive: drive to read from
 302  *      @setting: drive setting
 303  *      @val: value
 304  *
 305  *      Write a drive setting if it is possible. The caller
 306  *      must hold the ide_setting_mtx when making this call.
 307  *
 308  *      BUGS: the data return and error are the same return value
 309  *      so an error -EINVAL and true return of the same value cannot
 310  *      be told apart
 311  *
 312  *      FIXME:  This should be changed to enqueue a special request
 313  *      to the driver to change settings, and then wait on a sema for completion.
 314  *      The current scheme of polling is kludgy, though safe enough.
 315  */
 316
 317 static int ide_write_setting(ide_drive_t *drive, ide_settings_t *setting, int val)
 318 {
 319         if (!capable(CAP_SYS_ADMIN))
 320                 return -EACCES;
 321         if (setting->set)
 322                 return setting->set(drive, val);
 323         if (!(setting->rw & SETTING_WRITE))
 324                 return -EPERM;
 325         if (val < setting->min || val > setting->max)
 326                 return -EINVAL;
 327         if (ide_spin_wait_hwgroup(drive))
 328                 return -EBUSY;
 329         switch (setting->data_type) {
 330         case TYPE_BYTE:
 331                 *((u8 *) setting->data) = val;
 332                 break;
 333         case TYPE_SHORT:
 334                 *((u16 *) setting->data) = val;
 335                 break;
 336         case TYPE_INT:
 337                 *((u32 *) setting->data) = val;
 338                 break;
 339         }
 340         spin_unlock_irq(&ide_lock);
 341         return 0;
 342 }
 343
 344 static int set_xfer_rate (ide_drive_t *drive, int arg)
 345 {
 346         ide_task_t task;
 347         int err;
 348
 349         if (arg < 0 || arg > 70)
 350                 return -EINVAL;
 351
 352         memset(&task, 0, sizeof(task));
 353         task.tf.command = WIN_SETFEATURES;
 354         task.tf.feature = SETFEATURES_XFER;
 355         task.tf.nsect   = (u8)arg;
 356         task.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT |
 357                         IDE_TFLAG_IN_NSECT;
 358
 359         err = ide_no_data_taskfile(drive, &task);
 360
 361         if (!err && arg) {
 362                 ide_set_xfer_rate(drive, (u8) arg);
 363                 ide_driveid_update(drive);
 364         }
 365         return err;
 366 }
 367
 368 /**
 369  *      ide_add_generic_settings        -       generic ide settings
 370  *      @drive: drive being configured
 371  *
 372  *      Add the generic parts of the system settings to the /proc files.
 373  *      The caller must not be holding the ide_setting_mtx.
 374  */
 375
 376 void ide_add_generic_settings (ide_drive_t *drive)
 377 {
 378 /*
 379  *                        drive         setting name            read/write access                               data type       min     max                             mul_factor      div_factor      data pointer                    set function
 380  */
 381         __ide_add_setting(drive,        "io_32bit",             drive->no_io_32bit ? SETTING_READ : SETTING_RW, TYPE_BYTE,      0,      1 + (SUPPORT_VLB_SYNC << 1),    1,              1,              &drive->io_32bit,               set_io_32bit,   0);
 382         __ide_add_setting(drive,        "keepsettings",         SETTING_RW,                                     TYPE_BYTE,      0,      1,                              1,              1,              &drive->keep_settings,          NULL,           0);
 383         __ide_add_setting(drive,        "nice1",                SETTING_RW,                                     TYPE_BYTE,      0,      1,                              1,              1,              &drive->nice1,                  NULL,           0);
 384         __ide_add_setting(drive,        "pio_mode",             SETTING_WRITE,                                  TYPE_BYTE,      0,      255,                            1,              1,              NULL,                           set_pio_mode,   0);
 385         __ide_add_setting(drive,        "unmaskirq",            drive->no_unmask ? SETTING_READ : SETTING_RW,   TYPE_BYTE,      0,      1,                              1,              1,              &drive->unmask,                 NULL,           0);
 386         __ide_add_setting(drive,        "using_dma",            SETTING_RW,                                     TYPE_BYTE,      0,      1,                              1,              1,              &drive->using_dma,              set_using_dma,  0);
 387         __ide_add_setting(drive,        "init_speed",           SETTING_RW,                                     TYPE_BYTE,      0,      70,                             1,              1,              &drive->init_speed,             NULL,           0);
 388         __ide_add_setting(drive,        "current_speed",        SETTING_RW,                                     TYPE_BYTE,      0,      70,                             1,              1,              &drive->current_speed,          set_xfer_rate,  0);
 389         __ide_add_setting(drive,        "number",               SETTING_RW,                                     TYPE_BYTE,      0,      3,                              1,              1,              &drive->dn,                     NULL,           0);
 390 }
 391
 392 static void proc_ide_settings_warn(void)
 393 {
 394         static int warned;
 395
 396         if (warned)
 397                 return;
 398
 399         printk(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "
 400                             "obsolete, and will be removed soon!\n");
 401         warned = 1;
 402 }
 403
 404 static int proc_ide_read_settings
 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         ide_settings_t  *setting = (ide_settings_t *) drive->settings;
 409         char            *out = page;
 410         int             len, rc, mul_factor, div_factor;
 411
 412         proc_ide_settings_warn();
 413
 414         mutex_lock(&ide_setting_mtx);
 415         out += sprintf(out, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
 416         out += sprintf(out, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
 417         while (setting) {
 418                 mul_factor = setting->mul_factor;
 419                 div_factor = setting->div_factor;
 420                 out += sprintf(out, "%-24s", setting->name);
 421                 rc = ide_read_setting(drive, setting);
 422                 if (rc >= 0)
 423                         out += sprintf(out, "%-16d", rc * mul_factor / div_factor);
 424                 else
 425                         out += sprintf(out, "%-16s", "write-only");
 426                 out += sprintf(out, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
 427                 if (setting->rw & SETTING_READ)
 428                         out += sprintf(out, "r");
 429                 if (setting->rw & SETTING_WRITE)
 430                         out += sprintf(out, "w");
 431                 out += sprintf(out, "\n");
 432                 setting = setting->next;
 433         }
 434         len = out - page;
 435         mutex_unlock(&ide_setting_mtx);
 436         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 437 }
 438
 439 #define MAX_LEN 30
 440
 441 static int proc_ide_write_settings(struct file *file, const char __user *buffer,
 442                                    unsigned long count, void *data)
 443 {
 444         ide_drive_t     *drive = (ide_drive_t *) data;
 445         char            name[MAX_LEN + 1];
 446         int             for_real = 0;
 447         unsigned long   n;
 448         ide_settings_t  *setting;
 449         char *buf, *s;
 450
 451         if (!capable(CAP_SYS_ADMIN))
 452                 return -EACCES;
 453
 454         proc_ide_settings_warn();
 455
 456         if (count >= PAGE_SIZE)
 457                 return -EINVAL;
 458
 459         s = buf = (char *)__get_free_page(GFP_USER);
 460         if (!buf)
 461                 return -ENOMEM;
 462
 463         if (copy_from_user(buf, buffer, count)) {
 464                 free_page((unsigned long)buf);
 465                 return -EFAULT;
 466         }
 467
 468         buf[count] = '\0';
 469
 470         /*
 471          * Skip over leading whitespace
 472          */
 473         while (count && isspace(*s)) {
 474                 --count;
 475                 ++s;
 476         }
 477         /*
 478          * Do one full pass to verify all parameters,
 479          * then do another to actually write the new settings.
 480          */
 481         do {
 482                 char *p = s;
 483                 n = count;
 484                 while (n > 0) {
 485                         unsigned val;
 486                         char *q = p;
 487
 488                         while (n > 0 && *p != ':') {
 489                                 --n;
 490                                 p++;
 491                         }
 492                         if (*p != ':')
 493                                 goto parse_error;
 494                         if (p - q > MAX_LEN)
 495                                 goto parse_error;
 496                         memcpy(name, q, p - q);
 497                         name[p - q] = 0;
 498
 499                         if (n > 0) {
 500                                 --n;
 501                                 p++;
 502                         } else
 503                                 goto parse_error;
 504
 505                         val = simple_strtoul(p, &q, 10);
 506                         n -= q - p;
 507                         p = q;
 508                         if (n > 0 && !isspace(*p))
 509                                 goto parse_error;
 510                         while (n > 0 && isspace(*p)) {
 511                                 --n;
 512                                 ++p;
 513                         }
 514
 515                         mutex_lock(&ide_setting_mtx);
 516                         setting = ide_find_setting_by_name(drive, name);
 517                         if (!setting) {
 518                                 mutex_unlock(&ide_setting_mtx);
 519                                 goto parse_error;
 520                         }
 521                         if (for_real)
 522                                 ide_write_setting(drive, setting, val * setting->div_factor / setting->mul_factor);
 523                         mutex_unlock(&ide_setting_mtx);
 524                 }
 525         } while (!for_real++);
 526         free_page((unsigned long)buf);
 527         return count;
 528 parse_error:
 529         free_page((unsigned long)buf);
 530         printk("proc_ide_write_settings(): parse error\n");
 531         return -EINVAL;
 532 }
 533
 534 int proc_ide_read_capacity
 535         (char *page, char **start, off_t off, int count, int *eof, void *data)
 536 {
 537         int len = sprintf(page, "%llu\n", (long long)0x7fffffff);
 538         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 539 }
 540
 541 EXPORT_SYMBOL_GPL(proc_ide_read_capacity);
 542
 543 int proc_ide_read_geometry
 544         (char *page, char **start, off_t off, int count, int *eof, void *data)
 545 {
 546         ide_drive_t     *drive = (ide_drive_t *) data;
 547         char            *out = page;
 548         int             len;
 549
 550         out += sprintf(out, "physical     %d/%d/%d\n",
 551                         drive->cyl, drive->head, drive->sect);
 552         out += sprintf(out, "logical      %d/%d/%d\n",
 553                         drive->bios_cyl, drive->bios_head, drive->bios_sect);
 554
 555         len = out - page;
 556         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 557 }
 558
 559 EXPORT_SYMBOL(proc_ide_read_geometry);
 560
 561 static int proc_ide_read_dmodel
 562         (char *page, char **start, off_t off, int count, int *eof, void *data)
 563 {
 564         ide_drive_t     *drive = (ide_drive_t *) data;
 565         struct hd_driveid *id = drive->id;
 566         int             len;
 567
 568         len = sprintf(page, "%.40s\n",
 569                 (id && id->model[0]) ? (char *)id->model : "(none)");
 570         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 571 }
 572
 573 static int proc_ide_read_driver
 574         (char *page, char **start, off_t off, int count, int *eof, void *data)
 575 {
 576         ide_drive_t     *drive = (ide_drive_t *) data;
 577         struct device   *dev = &drive->gendev;
 578         ide_driver_t    *ide_drv;
 579         int             len;
 580
 581         if (dev->driver) {
 582                 ide_drv = container_of(dev->driver, ide_driver_t, gen_driver);
 583                 len = sprintf(page, "%s version %s\n",
 584                                 dev->driver->name, ide_drv->version);
 585         } else
 586                 len = sprintf(page, "ide-default version 0.9.newide\n");
 587         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 588 }
 589
 590 static int ide_replace_subdriver(ide_drive_t *drive, const char *driver)
 591 {
 592         struct device *dev = &drive->gendev;
 593         int ret = 1;
 594         int err;
 595
 596         device_release_driver(dev);
 597         /* FIXME: device can still be in use by previous driver */
 598         strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
 599         err = device_attach(dev);
 600         if (err < 0)
 601                 printk(KERN_WARNING "IDE: %s: device_attach error: %d\n",
 602                         __func__, err);
 603         drive->driver_req[0] = 0;
 604         if (dev->driver == NULL) {
 605                 err = device_attach(dev);
 606                 if (err < 0)
 607                         printk(KERN_WARNING
 608                                 "IDE: %s: device_attach(2) error: %d\n",
 609                                 __func__, err);
 610         }
 611         if (dev->driver && !strcmp(dev->driver->name, driver))
 612                 ret = 0;
 613
 614         return ret;
 615 }
 616
 617 static int proc_ide_write_driver
 618         (struct file *file, const char __user *buffer, unsigned long count, void *data)
 619 {
 620         ide_drive_t     *drive = (ide_drive_t *) data;
 621         char name[32];
 622
 623         if (!capable(CAP_SYS_ADMIN))
 624                 return -EACCES;
 625         if (count > 31)
 626                 count = 31;
 627         if (copy_from_user(name, buffer, count))
 628                 return -EFAULT;
 629         name[count] = '\0';
 630         if (ide_replace_subdriver(drive, name))
 631                 return -EINVAL;
 632         return count;
 633 }
 634
 635 static int proc_ide_read_media
 636         (char *page, char **start, off_t off, int count, int *eof, void *data)
 637 {
 638         ide_drive_t     *drive = (ide_drive_t *) data;
 639         const char      *media;
 640         int             len;
 641
 642         switch (drive->media) {
 643         case ide_disk:          media = "disk\n";       break;
 644         case ide_cdrom:         media = "cdrom\n";      break;
 645         case ide_tape:          media = "tape\n";       break;
 646         case ide_floppy:        media = "floppy\n";     break;
 647         case ide_optical:       media = "optical\n";    break;
 648         default:                media = "UNKNOWN\n";    break;
 649         }
 650         strcpy(page, media);
 651         len = strlen(media);
 652         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 653 }
 654
 655 static ide_proc_entry_t generic_drive_entries[] = {
 656         { "driver",     S_IFREG|S_IRUGO,         proc_ide_read_driver,
 657                                                  proc_ide_write_driver },
 658         { "identify",   S_IFREG|S_IRUSR,         proc_ide_read_identify, NULL },
 659         { "media",      S_IFREG|S_IRUGO,         proc_ide_read_media,    NULL },
 660         { "model",      S_IFREG|S_IRUGO,         proc_ide_read_dmodel,   NULL },
 661         { "settings",   S_IFREG|S_IRUSR|S_IWUSR, proc_ide_read_settings,
 662                                                  proc_ide_write_settings },
 663         { NULL, 0, NULL, NULL }
 664 };
 665
 666 static void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
 667 {
 668         struct proc_dir_entry *ent;
 669
 670         if (!dir || !p)
 671                 return;
 672         while (p->name != NULL) {
 673                 ent = create_proc_entry(p->name, p->mode, dir);
 674                 if (!ent) return;
 675                 ent->data = data;
 676                 ent->read_proc = p->read_proc;
 677                 ent->write_proc = p->write_proc;
 678                 p++;
 679         }
 680 }
 681
 682 static void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
 683 {
 684         if (!dir || !p)
 685                 return;
 686         while (p->name != NULL) {
 687                 remove_proc_entry(p->name, dir);
 688                 p++;
 689         }
 690 }
 691
 692 void ide_proc_register_driver(ide_drive_t *drive, ide_driver_t *driver)
 693 {
 694         ide_add_proc_entries(drive->proc, driver->proc, drive);
 695 }
 696
 697 EXPORT_SYMBOL(ide_proc_register_driver);
 698
 699 /**
 700  *      ide_proc_unregister_driver      -       remove driver specific data
 701  *      @drive: drive
 702  *      @driver: driver
 703  *
 704  *      Clean up the driver specific /proc files and IDE settings
 705  *      for a given drive.
 706  *
 707  *      Takes ide_setting_mtx and ide_lock.
 708  *      Caller must hold none of the locks.
 709  */
 710
 711 void ide_proc_unregister_driver(ide_drive_t *drive, ide_driver_t *driver)
 712 {
 713         unsigned long flags;
 714
 715         ide_remove_proc_entries(drive->proc, driver->proc);
 716
 717         mutex_lock(&ide_setting_mtx);
 718         spin_lock_irqsave(&ide_lock, flags);
 719         /*
 720          * ide_setting_mtx protects the settings list
 721          * ide_lock protects the use of settings
 722          *
 723          * so we need to hold both, ide_settings_sem because we want to
 724          * modify the settings list, and ide_lock because we cannot take
 725          * a setting out that is being used.
 726          *
 727          * OTOH both ide_{read,write}_setting are only ever used under
 728          * ide_setting_mtx.
 729          */
 730         auto_remove_settings(drive);
 731         spin_unlock_irqrestore(&ide_lock, flags);
 732         mutex_unlock(&ide_setting_mtx);
 733 }
 734 EXPORT_SYMBOL(ide_proc_unregister_driver);
 735
 736 void ide_proc_port_register_devices(ide_hwif_t *hwif)
 737 {
 738         int     d;
 739         struct proc_dir_entry *ent;
 740         struct proc_dir_entry *parent = hwif->proc;
 741         char name[64];
 742
 743         for (d = 0; d < MAX_DRIVES; d++) {
 744                 ide_drive_t *drive = &hwif->drives[d];
 745
 746                 if (!drive->present)
 747                         continue;
 748                 if (drive->proc)
 749                         continue;
 750
 751                 drive->proc = proc_mkdir(drive->name, parent);
 752                 if (drive->proc)
 753                         ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
 754                 sprintf(name, "ide%d/%s", (drive->name[2]-'a')/2, drive->name);
 755                 ent = proc_symlink(drive->name, proc_ide_root, name);
 756                 if (!ent) return;
 757         }
 758 }
 759
 760 void ide_proc_unregister_device(ide_drive_t *drive)
 761 {
 762         if (drive->proc) {
 763                 ide_remove_proc_entries(drive->proc, generic_drive_entries);
 764                 remove_proc_entry(drive->name, proc_ide_root);
 765                 remove_proc_entry(drive->name, drive->hwif->proc);
 766                 drive->proc = NULL;
 767         }
 768 }
 769
 770 static ide_proc_entry_t hwif_entries[] = {
 771         { "channel",    S_IFREG|S_IRUGO,        proc_ide_read_channel,  NULL },
 772         { "mate",       S_IFREG|S_IRUGO,        proc_ide_read_mate,     NULL },
 773         { "model",      S_IFREG|S_IRUGO,        proc_ide_read_imodel,   NULL },
 774         { NULL, 0, NULL, NULL }
 775 };
 776
 777 void ide_proc_register_port(ide_hwif_t *hwif)
 778 {
 779         if (!hwif->proc) {
 780                 hwif->proc = proc_mkdir(hwif->name, proc_ide_root);
 781
 782                 if (!hwif->proc)
 783                         return;
 784
 785                 ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
 786         }
 787 }
 788
 789 void ide_proc_unregister_port(ide_hwif_t *hwif)
 790 {
 791         if (hwif->proc) {
 792                 ide_remove_proc_entries(hwif->proc, hwif_entries);
 793                 remove_proc_entry(hwif->name, proc_ide_root);
 794                 hwif->proc = NULL;
 795         }
 796 }
 797
 798 static int proc_print_driver(struct device_driver *drv, void *data)
 799 {
 800         ide_driver_t *ide_drv = container_of(drv, ide_driver_t, gen_driver);
 801         struct seq_file *s = data;
 802
 803         seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);
 804
 805         return 0;
 806 }
 807
 808 static int ide_drivers_show(struct seq_file *s, void *p)
 809 {
 810         int err;
 811
 812         err = bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
 813         if (err < 0)
 814                 printk(KERN_WARNING "IDE: %s: bus_for_each_drv error: %d\n",
 815                         __func__, err);
 816         return 0;
 817 }
 818
 819 static int ide_drivers_open(struct inode *inode, struct file *file)
 820 {
 821         return single_open(file, &ide_drivers_show, NULL);
 822 }
 823
 824 static const struct file_operations ide_drivers_operations = {
 825         .owner          = THIS_MODULE,
 826         .open           = ide_drivers_open,
 827         .read           = seq_read,
 828         .llseek         = seq_lseek,
 829         .release        = single_release,
 830 };
 831
 832 void proc_ide_create(void)
 833 {
 834         proc_ide_root = proc_mkdir("ide", NULL);
 835
 836         if (!proc_ide_root)
 837                 return;
 838
 839         proc_create("drivers", 0, proc_ide_root, &ide_drivers_operations);
 840 }
 841
 842 void proc_ide_destroy(void)
 843 {
 844         remove_proc_entry("drivers", proc_ide_root);
 845         remove_proc_entry("ide", NULL);
 846 }