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 <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_acorn:         name = "acorn";         break;
  67         default:                name = "(unknown)";     break;
  68         }
  69         len = sprintf(page, "%s\n", name);
  70         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  71 }
  72
  73 static int proc_ide_read_mate
  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         if (hwif && hwif->mate)
  80                 len = sprintf(page, "%s\n", hwif->mate->name);
  81         else
  82                 len = sprintf(page, "(none)\n");
  83         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  84 }
  85
  86 static int proc_ide_read_channel
  87         (char *page, char **start, off_t off, int count, int *eof, void *data)
  88 {
  89         ide_hwif_t      *hwif = (ide_hwif_t *) data;
  90         int             len;
  91
  92         page[0] = hwif->channel ? '1' : '0';
  93         page[1] = '\n';
  94         len = 2;
  95         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
  96 }
  97
  98 static int proc_ide_read_identify
  99         (char *page, char **start, off_t off, int count, int *eof, void *data)
 100 {
 101         ide_drive_t     *drive = (ide_drive_t *)data;
 102         int             len = 0, i = 0;
 103         int             err = 0;
 104
 105         len = sprintf(page, "\n");
 106
 107         if (drive) {
 108                 unsigned short *val = (unsigned short *) page;
 109
 110                 err = taskfile_lib_get_identify(drive, page);
 111                 if (!err) {
 112                         char *out = ((char *)page) + (SECTOR_WORDS * 4);
 113                         page = out;
 114                         do {
 115                                 out += sprintf(out, "%04x%c",
 116                                         le16_to_cpu(*val), (++i & 7) ? ' ' : '\n');
 117                                 val += 1;
 118                         } while (i < (SECTOR_WORDS * 2));
 119                         len = out - page;
 120                 }
 121         }
 122         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 123 }
 124
 125 /**
 126  *      __ide_add_setting       -       add an ide setting option
 127  *      @drive: drive to use
 128  *      @name: setting name
 129  *      @rw: true if the function is read write
 130  *      @data_type: type of data
 131  *      @min: range minimum
 132  *      @max: range maximum
 133  *      @mul_factor: multiplication scale
 134  *      @div_factor: divison scale
 135  *      @data: private data field
 136  *      @set: setting
 137  *      @auto_remove: setting auto removal flag
 138  *
 139  *      Removes the setting named from the device if it is present.
 140  *      The function takes the settings_lock to protect against
 141  *      parallel changes. This function must not be called from IRQ
 142  *      context. Returns 0 on success or -1 on failure.
 143  *
 144  *      BUGS: This code is seriously over-engineered. There is also
 145  *      magic about how the driver specific features are setup. If
 146  *      a driver is attached we assume the driver settings are auto
 147  *      remove.
 148  */
 149
 150 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)
 151 {
 152         ide_settings_t **p = (ide_settings_t **) &drive->settings, *setting = NULL;
 153
 154         mutex_lock(&ide_setting_mtx);
 155         while ((*p) && strcmp((*p)->name, name) < 0)
 156                 p = &((*p)->next);
 157         if ((setting = kzalloc(sizeof(*setting), GFP_KERNEL)) == NULL)
 158                 goto abort;
 159         if ((setting->name = kmalloc(strlen(name) + 1, GFP_KERNEL)) == NULL)
 160                 goto abort;
 161         strcpy(setting->name, name);
 162         setting->rw = rw;
 163         setting->data_type = data_type;
 164         setting->min = min;
 165         setting->max = max;
 166         setting->mul_factor = mul_factor;
 167         setting->div_factor = div_factor;
 168         setting->data = data;
 169         setting->set = set;
 170
 171         setting->next = *p;
 172         if (auto_remove)
 173                 setting->auto_remove = 1;
 174         *p = setting;
 175         mutex_unlock(&ide_setting_mtx);
 176         return 0;
 177 abort:
 178         mutex_unlock(&ide_setting_mtx);
 179         kfree(setting);
 180         return -1;
 181 }
 182
 183 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)
 184 {
 185         return __ide_add_setting(drive, name, rw, data_type, min, max, mul_factor, div_factor, data, set, 1);
 186 }
 187
 188 EXPORT_SYMBOL(ide_add_setting);
 189
 190 /**
 191  *      __ide_remove_setting    -       remove an ide setting option
 192  *      @drive: drive to use
 193  *      @name: setting name
 194  *
 195  *      Removes the setting named from the device if it is present.
 196  *      The caller must hold the setting semaphore.
 197  */
 198
 199 static void __ide_remove_setting(ide_drive_t *drive, char *name)
 200 {
 201         ide_settings_t **p, *setting;
 202
 203         p = (ide_settings_t **) &drive->settings;
 204
 205         while ((*p) && strcmp((*p)->name, name))
 206                 p = &((*p)->next);
 207         setting = (*p);
 208         if (setting == NULL)
 209                 return;
 210
 211         (*p) = setting->next;
 212
 213         kfree(setting->name);
 214         kfree(setting);
 215 }
 216
 217 /**
 218  *      auto_remove_settings    -       remove driver specific settings
 219  *      @drive: drive
 220  *
 221  *      Automatically remove all the driver specific settings for this
 222  *      drive. This function may not be called from IRQ context. The
 223  *      caller must hold ide_setting_mtx.
 224  */
 225
 226 static void auto_remove_settings(ide_drive_t *drive)
 227 {
 228         ide_settings_t *setting;
 229 repeat:
 230         setting = drive->settings;
 231         while (setting) {
 232                 if (setting->auto_remove) {
 233                         __ide_remove_setting(drive, setting->name);
 234                         goto repeat;
 235                 }
 236                 setting = setting->next;
 237         }
 238 }
 239
 240 /**
 241  *      ide_find_setting_by_name        -       find a drive specific setting
 242  *      @drive: drive to scan
 243  *      @name: setting name
 244  *
 245  *      Scan's the device setting table for a matching entry and returns
 246  *      this or NULL if no entry is found. The caller must hold the
 247  *      setting semaphore
 248  */
 249
 250 static ide_settings_t *ide_find_setting_by_name(ide_drive_t *drive, char *name)
 251 {
 252         ide_settings_t *setting = drive->settings;
 253
 254         while (setting) {
 255                 if (strcmp(setting->name, name) == 0)
 256                         break;
 257                 setting = setting->next;
 258         }
 259         return setting;
 260 }
 261
 262 /**
 263  *      ide_read_setting        -       read an IDE setting
 264  *      @drive: drive to read from
 265  *      @setting: drive setting
 266  *
 267  *      Read a drive setting and return the value. The caller
 268  *      must hold the ide_setting_mtx when making this call.
 269  *
 270  *      BUGS: the data return and error are the same return value
 271  *      so an error -EINVAL and true return of the same value cannot
 272  *      be told apart
 273  */
 274
 275 static int ide_read_setting(ide_drive_t *drive, ide_settings_t *setting)
 276 {
 277         int             val = -EINVAL;
 278         unsigned long   flags;
 279
 280         if ((setting->rw & SETTING_READ)) {
 281                 spin_lock_irqsave(&ide_lock, flags);
 282                 switch (setting->data_type) {
 283                 case TYPE_BYTE:
 284                         val = *((u8 *) setting->data);
 285                         break;
 286                 case TYPE_SHORT:
 287                         val = *((u16 *) setting->data);
 288                         break;
 289                 case TYPE_INT:
 290                         val = *((u32 *) setting->data);
 291                         break;
 292                 }
 293                 spin_unlock_irqrestore(&ide_lock, flags);
 294         }
 295         return val;
 296 }
 297
 298 /**
 299  *      ide_write_setting       -       read an IDE setting
 300  *      @drive: drive to read from
 301  *      @setting: drive setting
 302  *      @val: value
 303  *
 304  *      Write a drive setting if it is possible. The caller
 305  *      must hold the ide_setting_mtx when making this call.
 306  *
 307  *      BUGS: the data return and error are the same return value
 308  *      so an error -EINVAL and true return of the same value cannot
 309  *      be told apart
 310  *
 311  *      FIXME:  This should be changed to enqueue a special request
 312  *      to the driver to change settings, and then wait on a sema for completion.
 313  *      The current scheme of polling is kludgy, though safe enough.
 314  */
 315
 316 static int ide_write_setting(ide_drive_t *drive, ide_settings_t *setting, int val)
 317 {
 318         if (!capable(CAP_SYS_ADMIN))
 319                 return -EACCES;
 320         if (setting->set)
 321                 return setting->set(drive, val);
 322         if (!(setting->rw & SETTING_WRITE))
 323                 return -EPERM;
 324         if (val < setting->min || val > setting->max)
 325                 return -EINVAL;
 326         if (ide_spin_wait_hwgroup(drive))
 327                 return -EBUSY;
 328         switch (setting->data_type) {
 329         case TYPE_BYTE:
 330                 *((u8 *) setting->data) = val;
 331                 break;
 332         case TYPE_SHORT:
 333                 *((u16 *) setting->data) = val;
 334                 break;
 335         case TYPE_INT:
 336                 *((u32 *) setting->data) = val;
 337                 break;
 338         }
 339         spin_unlock_irq(&ide_lock);
 340         return 0;
 341 }
 342
 343 static int set_xfer_rate (ide_drive_t *drive, int arg)
 344 {
 345         ide_task_t task;
 346         int err;
 347
 348         if (arg < 0 || arg > 70)
 349                 return -EINVAL;
 350
 351         memset(&task, 0, sizeof(task));
 352         task.tf.command = WIN_SETFEATURES;
 353         task.tf.feature = SETFEATURES_XFER;
 354         task.tf.nsect   = (u8)arg;
 355         task.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT |
 356                         IDE_TFLAG_IN_NSECT;
 357
 358         err = ide_no_data_taskfile(drive, &task);
 359
 360         if (!err && arg) {
 361                 ide_set_xfer_rate(drive, (u8) arg);
 362                 ide_driveid_update(drive);
 363         }
 364         return err;
 365 }
 366
 367 /**
 368  *      ide_add_generic_settings        -       generic ide settings
 369  *      @drive: drive being configured
 370  *
 371  *      Add the generic parts of the system settings to the /proc files.
 372  *      The caller must not be holding the ide_setting_mtx.
 373  */
 374
 375 void ide_add_generic_settings (ide_drive_t *drive)
 376 {
 377 /*
 378  *                        drive         setting name            read/write access                               data type       min     max                             mul_factor      div_factor      data pointer                    set function
 379  */
 380         __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);
 381         __ide_add_setting(drive,        "keepsettings",         SETTING_RW,                                     TYPE_BYTE,      0,      1,                              1,              1,              &drive->keep_settings,          NULL,           0);
 382         __ide_add_setting(drive,        "nice1",                SETTING_RW,                                     TYPE_BYTE,      0,      1,                              1,              1,              &drive->nice1,                  NULL,           0);
 383         __ide_add_setting(drive,        "pio_mode",             SETTING_WRITE,                                  TYPE_BYTE,      0,      255,                            1,              1,              NULL,                           set_pio_mode,   0);
 384         __ide_add_setting(drive,        "unmaskirq",            drive->no_unmask ? SETTING_READ : SETTING_RW,   TYPE_BYTE,      0,      1,                              1,              1,              &drive->unmask,                 NULL,           0);
 385         __ide_add_setting(drive,        "using_dma",            SETTING_RW,                                     TYPE_BYTE,      0,      1,                              1,              1,              &drive->using_dma,              set_using_dma,  0);
 386         __ide_add_setting(drive,        "init_speed",           SETTING_RW,                                     TYPE_BYTE,      0,      70,                             1,              1,              &drive->init_speed,             NULL,           0);
 387         __ide_add_setting(drive,        "current_speed",        SETTING_RW,                                     TYPE_BYTE,      0,      70,                             1,              1,              &drive->current_speed,          set_xfer_rate,  0);
 388         __ide_add_setting(drive,        "number",               SETTING_RW,                                     TYPE_BYTE,      0,      3,                              1,              1,              &drive->dn,                     NULL,           0);
 389 }
 390
 391 static void proc_ide_settings_warn(void)
 392 {
 393         static int warned;
 394
 395         if (warned)
 396                 return;
 397
 398         printk(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "
 399                             "obsolete, and will be removed soon!\n");
 400         warned = 1;
 401 }
 402
 403 static int proc_ide_read_settings
 404         (char *page, char **start, off_t off, int count, int *eof, void *data)
 405 {
 406         ide_drive_t     *drive = (ide_drive_t *) data;
 407         ide_settings_t  *setting = (ide_settings_t *) drive->settings;
 408         char            *out = page;
 409         int             len, rc, mul_factor, div_factor;
 410
 411         proc_ide_settings_warn();
 412
 413         mutex_lock(&ide_setting_mtx);
 414         out += sprintf(out, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
 415         out += sprintf(out, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
 416         while (setting) {
 417                 mul_factor = setting->mul_factor;
 418                 div_factor = setting->div_factor;
 419                 out += sprintf(out, "%-24s", setting->name);
 420                 rc = ide_read_setting(drive, setting);
 421                 if (rc >= 0)
 422                         out += sprintf(out, "%-16d", rc * mul_factor / div_factor);
 423                 else
 424                         out += sprintf(out, "%-16s", "write-only");
 425                 out += sprintf(out, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
 426                 if (setting->rw & SETTING_READ)
 427                         out += sprintf(out, "r");
 428                 if (setting->rw & SETTING_WRITE)
 429                         out += sprintf(out, "w");
 430                 out += sprintf(out, "\n");
 431                 setting = setting->next;
 432         }
 433         len = out - page;
 434         mutex_unlock(&ide_setting_mtx);
 435         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 436 }
 437
 438 #define MAX_LEN 30
 439
 440 static int proc_ide_write_settings(struct file *file, const char __user *buffer,
 441                                    unsigned long count, void *data)
 442 {
 443         ide_drive_t     *drive = (ide_drive_t *) data;
 444         char            name[MAX_LEN + 1];
 445         int             for_real = 0;
 446         unsigned long   n;
 447         ide_settings_t  *setting;
 448         char *buf, *s;
 449
 450         if (!capable(CAP_SYS_ADMIN))
 451                 return -EACCES;
 452
 453         proc_ide_settings_warn();
 454
 455         if (count >= PAGE_SIZE)
 456                 return -EINVAL;
 457
 458         s = buf = (char *)__get_free_page(GFP_USER);
 459         if (!buf)
 460                 return -ENOMEM;
 461
 462         if (copy_from_user(buf, buffer, count)) {
 463                 free_page((unsigned long)buf);
 464                 return -EFAULT;
 465         }
 466
 467         buf[count] = '\0';
 468
 469         /*
 470          * Skip over leading whitespace
 471          */
 472         while (count && isspace(*s)) {
 473                 --count;
 474                 ++s;
 475         }
 476         /*
 477          * Do one full pass to verify all parameters,
 478          * then do another to actually write the new settings.
 479          */
 480         do {
 481                 char *p = s;
 482                 n = count;
 483                 while (n > 0) {
 484                         unsigned val;
 485                         char *q = p;
 486
 487                         while (n > 0 && *p != ':') {
 488                                 --n;
 489                                 p++;
 490                         }
 491                         if (*p != ':')
 492                                 goto parse_error;
 493                         if (p - q > MAX_LEN)
 494                                 goto parse_error;
 495                         memcpy(name, q, p - q);
 496                         name[p - q] = 0;
 497
 498                         if (n > 0) {
 499                                 --n;
 500                                 p++;
 501                         } else
 502                                 goto parse_error;
 503
 504                         val = simple_strtoul(p, &q, 10);
 505                         n -= q - p;
 506                         p = q;
 507                         if (n > 0 && !isspace(*p))
 508                                 goto parse_error;
 509                         while (n > 0 && isspace(*p)) {
 510                                 --n;
 511                                 ++p;
 512                         }
 513
 514                         mutex_lock(&ide_setting_mtx);
 515                         setting = ide_find_setting_by_name(drive, name);
 516                         if (!setting) {
 517                                 mutex_unlock(&ide_setting_mtx);
 518                                 goto parse_error;
 519                         }
 520                         if (for_real)
 521                                 ide_write_setting(drive, setting, val * setting->div_factor / setting->mul_factor);
 522                         mutex_unlock(&ide_setting_mtx);
 523                 }
 524         } while (!for_real++);
 525         free_page((unsigned long)buf);
 526         return count;
 527 parse_error:
 528         free_page((unsigned long)buf);
 529         printk("proc_ide_write_settings(): parse error\n");
 530         return -EINVAL;
 531 }
 532
 533 int proc_ide_read_capacity
 534         (char *page, char **start, off_t off, int count, int *eof, void *data)
 535 {
 536         int len = sprintf(page, "%llu\n", (long long)0x7fffffff);
 537         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 538 }
 539
 540 EXPORT_SYMBOL_GPL(proc_ide_read_capacity);
 541
 542 int proc_ide_read_geometry
 543         (char *page, char **start, off_t off, int count, int *eof, void *data)
 544 {
 545         ide_drive_t     *drive = (ide_drive_t *) data;
 546         char            *out = page;
 547         int             len;
 548
 549         out += sprintf(out, "physical     %d/%d/%d\n",
 550                         drive->cyl, drive->head, drive->sect);
 551         out += sprintf(out, "logical      %d/%d/%d\n",
 552                         drive->bios_cyl, drive->bios_head, drive->bios_sect);
 553
 554         len = out - page;
 555         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 556 }
 557
 558 EXPORT_SYMBOL(proc_ide_read_geometry);
 559
 560 static int proc_ide_read_dmodel
 561         (char *page, char **start, off_t off, int count, int *eof, void *data)
 562 {
 563         ide_drive_t     *drive = (ide_drive_t *) data;
 564         struct hd_driveid *id = drive->id;
 565         int             len;
 566
 567         len = sprintf(page, "%.40s\n",
 568                 (id && id->model[0]) ? (char *)id->model : "(none)");
 569         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 570 }
 571
 572 static int proc_ide_read_driver
 573         (char *page, char **start, off_t off, int count, int *eof, void *data)
 574 {
 575         ide_drive_t     *drive = (ide_drive_t *) data;
 576         struct device   *dev = &drive->gendev;
 577         ide_driver_t    *ide_drv;
 578         int             len;
 579
 580         if (dev->driver) {
 581                 ide_drv = container_of(dev->driver, ide_driver_t, gen_driver);
 582                 len = sprintf(page, "%s version %s\n",
 583                                 dev->driver->name, ide_drv->version);
 584         } else
 585                 len = sprintf(page, "ide-default version 0.9.newide\n");
 586         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 587 }
 588
 589 static int ide_replace_subdriver(ide_drive_t *drive, const char *driver)
 590 {
 591         struct device *dev = &drive->gendev;
 592         int ret = 1;
 593         int err;
 594
 595         device_release_driver(dev);
 596         /* FIXME: device can still be in use by previous driver */
 597         strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
 598         err = device_attach(dev);
 599         if (err < 0)
 600                 printk(KERN_WARNING "IDE: %s: device_attach error: %d\n",
 601                         __func__, err);
 602         drive->driver_req[0] = 0;
 603         if (dev->driver == NULL) {
 604                 err = device_attach(dev);
 605                 if (err < 0)
 606                         printk(KERN_WARNING
 607                                 "IDE: %s: device_attach(2) error: %d\n",
 608                                 __func__, err);
 609         }
 610         if (dev->driver && !strcmp(dev->driver->name, driver))
 611                 ret = 0;
 612
 613         return ret;
 614 }
 615
 616 static int proc_ide_write_driver
 617         (struct file *file, const char __user *buffer, unsigned long count, void *data)
 618 {
 619         ide_drive_t     *drive = (ide_drive_t *) data;
 620         char name[32];
 621
 622         if (!capable(CAP_SYS_ADMIN))
 623                 return -EACCES;
 624         if (count > 31)
 625                 count = 31;
 626         if (copy_from_user(name, buffer, count))
 627                 return -EFAULT;
 628         name[count] = '\0';
 629         if (ide_replace_subdriver(drive, name))
 630                 return -EINVAL;
 631         return count;
 632 }
 633
 634 static int proc_ide_read_media
 635         (char *page, char **start, off_t off, int count, int *eof, void *data)
 636 {
 637         ide_drive_t     *drive = (ide_drive_t *) data;
 638         const char      *media;
 639         int             len;
 640
 641         switch (drive->media) {
 642         case ide_disk:          media = "disk\n";       break;
 643         case ide_cdrom:         media = "cdrom\n";      break;
 644         case ide_tape:          media = "tape\n";       break;
 645         case ide_floppy:        media = "floppy\n";     break;
 646         case ide_optical:       media = "optical\n";    break;
 647         default:                media = "UNKNOWN\n";    break;
 648         }
 649         strcpy(page, media);
 650         len = strlen(media);
 651         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 652 }
 653
 654 static ide_proc_entry_t generic_drive_entries[] = {
 655         { "driver",     S_IFREG|S_IRUGO,         proc_ide_read_driver,
 656                                                  proc_ide_write_driver },
 657         { "identify",   S_IFREG|S_IRUSR,         proc_ide_read_identify, NULL },
 658         { "media",      S_IFREG|S_IRUGO,         proc_ide_read_media,    NULL },
 659         { "model",      S_IFREG|S_IRUGO,         proc_ide_read_dmodel,   NULL },
 660         { "settings",   S_IFREG|S_IRUSR|S_IWUSR, proc_ide_read_settings,
 661                                                  proc_ide_write_settings },
 662         { NULL, 0, NULL, NULL }
 663 };
 664
 665 static void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
 666 {
 667         struct proc_dir_entry *ent;
 668
 669         if (!dir || !p)
 670                 return;
 671         while (p->name != NULL) {
 672                 ent = create_proc_entry(p->name, p->mode, dir);
 673                 if (!ent) return;
 674                 ent->data = data;
 675                 ent->read_proc = p->read_proc;
 676                 ent->write_proc = p->write_proc;
 677                 p++;
 678         }
 679 }
 680
 681 static void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
 682 {
 683         if (!dir || !p)
 684                 return;
 685         while (p->name != NULL) {
 686                 remove_proc_entry(p->name, dir);
 687                 p++;
 688         }
 689 }
 690
 691 void ide_proc_register_driver(ide_drive_t *drive, ide_driver_t *driver)
 692 {
 693         ide_add_proc_entries(drive->proc, driver->proc, drive);
 694 }
 695
 696 EXPORT_SYMBOL(ide_proc_register_driver);
 697
 698 /**
 699  *      ide_proc_unregister_driver      -       remove driver specific data
 700  *      @drive: drive
 701  *      @driver: driver
 702  *
 703  *      Clean up the driver specific /proc files and IDE settings
 704  *      for a given drive.
 705  *
 706  *      Takes ide_setting_mtx and ide_lock.
 707  *      Caller must hold none of the locks.
 708  */
 709
 710 void ide_proc_unregister_driver(ide_drive_t *drive, ide_driver_t *driver)
 711 {
 712         unsigned long flags;
 713
 714         ide_remove_proc_entries(drive->proc, driver->proc);
 715
 716         mutex_lock(&ide_setting_mtx);
 717         spin_lock_irqsave(&ide_lock, flags);
 718         /*
 719          * ide_setting_mtx protects the settings list
 720          * ide_lock protects the use of settings
 721          *
 722          * so we need to hold both, ide_settings_sem because we want to
 723          * modify the settings list, and ide_lock because we cannot take
 724          * a setting out that is being used.
 725          *
 726          * OTOH both ide_{read,write}_setting are only ever used under
 727          * ide_setting_mtx.
 728          */
 729         auto_remove_settings(drive);
 730         spin_unlock_irqrestore(&ide_lock, flags);
 731         mutex_unlock(&ide_setting_mtx);
 732 }
 733 EXPORT_SYMBOL(ide_proc_unregister_driver);
 734
 735 void ide_proc_port_register_devices(ide_hwif_t *hwif)
 736 {
 737         int     d;
 738         struct proc_dir_entry *ent;
 739         struct proc_dir_entry *parent = hwif->proc;
 740         char name[64];
 741
 742         for (d = 0; d < MAX_DRIVES; d++) {
 743                 ide_drive_t *drive = &hwif->drives[d];
 744
 745                 if (!drive->present)
 746                         continue;
 747                 if (drive->proc)
 748                         continue;
 749
 750                 drive->proc = proc_mkdir(drive->name, parent);
 751                 if (drive->proc)
 752                         ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
 753                 sprintf(name, "ide%d/%s", (drive->name[2]-'a')/2, drive->name);
 754                 ent = proc_symlink(drive->name, proc_ide_root, name);
 755                 if (!ent) return;
 756         }
 757 }
 758
 759 void ide_proc_unregister_device(ide_drive_t *drive)
 760 {
 761         if (drive->proc) {
 762                 ide_remove_proc_entries(drive->proc, generic_drive_entries);
 763                 remove_proc_entry(drive->name, proc_ide_root);
 764                 remove_proc_entry(drive->name, drive->hwif->proc);
 765                 drive->proc = NULL;
 766         }
 767 }
 768
 769 static ide_proc_entry_t hwif_entries[] = {
 770         { "channel",    S_IFREG|S_IRUGO,        proc_ide_read_channel,  NULL },
 771         { "mate",       S_IFREG|S_IRUGO,        proc_ide_read_mate,     NULL },
 772         { "model",      S_IFREG|S_IRUGO,        proc_ide_read_imodel,   NULL },
 773         { NULL, 0, NULL, NULL }
 774 };
 775
 776 void ide_proc_register_port(ide_hwif_t *hwif)
 777 {
 778         if (!hwif->proc) {
 779                 hwif->proc = proc_mkdir(hwif->name, proc_ide_root);
 780
 781                 if (!hwif->proc)
 782                         return;
 783
 784                 ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
 785         }
 786 }
 787
 788 void ide_proc_unregister_port(ide_hwif_t *hwif)
 789 {
 790         if (hwif->proc) {
 791                 ide_remove_proc_entries(hwif->proc, hwif_entries);
 792                 remove_proc_entry(hwif->name, proc_ide_root);
 793                 hwif->proc = NULL;
 794         }
 795 }
 796
 797 static int proc_print_driver(struct device_driver *drv, void *data)
 798 {
 799         ide_driver_t *ide_drv = container_of(drv, ide_driver_t, gen_driver);
 800         struct seq_file *s = data;
 801
 802         seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);
 803
 804         return 0;
 805 }
 806
 807 static int ide_drivers_show(struct seq_file *s, void *p)
 808 {
 809         int err;
 810
 811         err = bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
 812         if (err < 0)
 813                 printk(KERN_WARNING "IDE: %s: bus_for_each_drv error: %d\n",
 814                         __func__, err);
 815         return 0;
 816 }
 817
 818 static int ide_drivers_open(struct inode *inode, struct file *file)
 819 {
 820         return single_open(file, &ide_drivers_show, NULL);
 821 }
 822
 823 static const struct file_operations ide_drivers_operations = {
 824         .owner          = THIS_MODULE,
 825         .open           = ide_drivers_open,
 826         .read           = seq_read,
 827         .llseek         = seq_lseek,
 828         .release        = single_release,
 829 };
 830
 831 void proc_ide_create(void)
 832 {
 833         proc_ide_root = proc_mkdir("ide", NULL);
 834
 835         if (!proc_ide_root)
 836                 return;
 837
 838         proc_create("drivers", 0, proc_ide_root, &ide_drivers_operations);
 839 }
 840
 841 void proc_ide_destroy(void)
 842 {
 843         remove_proc_entry("drivers", proc_ide_root);
 844         remove_proc_entry("ide", NULL);
 845 }