drivers/ide/ide-proc.c

   1 /*
   2  *  Copyright (C) 1997-1998     Mark Lord
   3  *  Copyright (C) 2003          Red Hat
   4  *
   5  *  Some code was moved here from ide.c, see it for original copyrights.
   6  */
   7
   8 /*
   9  * This is the /proc/ide/ filesystem implementation.
  10  *
  11  * Drive/Driver settings can be retrieved by reading the drive's
  12  * "settings" files.  e.g.    "cat /proc/ide0/hda/settings"
  13  * To write a new value "val" into a specific setting "name", use:
  14  *   echo "name:val" >/proc/ide/ide0/hda/settings
  15  */
  16
  17 #include <linux/module.h>
  18
  19 #include <asm/uaccess.h>
  20 #include <linux/errno.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/stat.h>
  23 #include <linux/mm.h>
  24 #include <linux/pci.h>
  25 #include <linux/ctype.h>
  26 #include <linux/ide.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/slab.h>
  29
  30 #include <asm/io.h>
  31
  32 static struct proc_dir_entry *proc_ide_root;
  33
  34 static int ide_imodel_proc_show(struct seq_file *m, void *v)
  35 {
  36         ide_hwif_t      *hwif = (ide_hwif_t *) m->private;
  37         const char      *name;
  38
  39         switch (hwif->chipset) {
  40         case ide_generic:       name = "generic";       break;
  41         case ide_pci:           name = "pci";           break;
  42         case ide_cmd640:        name = "cmd640";        break;
  43         case ide_dtc2278:       name = "dtc2278";       break;
  44         case ide_ali14xx:       name = "ali14xx";       break;
  45         case ide_qd65xx:        name = "qd65xx";        break;
  46         case ide_umc8672:       name = "umc8672";       break;
  47         case ide_ht6560b:       name = "ht6560b";       break;
  48         case ide_4drives:       name = "4drives";       break;
  49         case ide_pmac:          name = "mac-io";        break;
  50         case ide_au1xxx:        name = "au1xxx";        break;
  51         case ide_palm3710:      name = "palm3710";      break;
  52         case ide_acorn:         name = "acorn";         break;
  53         default:                name = "(unknown)";     break;
  54         }
  55         seq_printf(m, "%s\n", name);
  56         return 0;
  57 }
  58
  59 static int ide_imodel_proc_open(struct inode *inode, struct file *file)
  60 {
  61         return single_open(file, ide_imodel_proc_show, PDE(inode)->data);
  62 }
  63
  64 static const struct file_operations ide_imodel_proc_fops = {
  65         .owner          = THIS_MODULE,
  66         .open           = ide_imodel_proc_open,
  67         .read           = seq_read,
  68         .llseek         = seq_lseek,
  69         .release        = single_release,
  70 };
  71
  72 static int ide_mate_proc_show(struct seq_file *m, void *v)
  73 {
  74         ide_hwif_t      *hwif = (ide_hwif_t *) m->private;
  75
  76         if (hwif && hwif->mate)
  77                 seq_printf(m, "%s\n", hwif->mate->name);
  78         else
  79                 seq_printf(m, "(none)\n");
  80         return 0;
  81 }
  82
  83 static int ide_mate_proc_open(struct inode *inode, struct file *file)
  84 {
  85         return single_open(file, ide_mate_proc_show, PDE(inode)->data);
  86 }
  87
  88 static const struct file_operations ide_mate_proc_fops = {
  89         .owner          = THIS_MODULE,
  90         .open           = ide_mate_proc_open,
  91         .read           = seq_read,
  92         .llseek         = seq_lseek,
  93         .release        = single_release,
  94 };
  95
  96 static int ide_channel_proc_show(struct seq_file *m, void *v)
  97 {
  98         ide_hwif_t      *hwif = (ide_hwif_t *) m->private;
  99
 100         seq_printf(m, "%c\n", hwif->channel ? '1' : '0');
 101         return 0;
 102 }
 103
 104 static int ide_channel_proc_open(struct inode *inode, struct file *file)
 105 {
 106         return single_open(file, ide_channel_proc_show, PDE(inode)->data);
 107 }
 108
 109 static const struct file_operations ide_channel_proc_fops = {
 110         .owner          = THIS_MODULE,
 111         .open           = ide_channel_proc_open,
 112         .read           = seq_read,
 113         .llseek         = seq_lseek,
 114         .release        = single_release,
 115 };
 116
 117 static int ide_identify_proc_show(struct seq_file *m, void *v)
 118 {
 119         ide_drive_t *drive = (ide_drive_t *)m->private;
 120         u8 *buf;
 121
 122         if (!drive) {
 123                 seq_putc(m, '\n');
 124                 return 0;
 125         }
 126
 127         buf = kmalloc(SECTOR_SIZE, GFP_KERNEL);
 128         if (!buf)
 129                 return -ENOMEM;
 130         if (taskfile_lib_get_identify(drive, buf) == 0) {
 131                 __le16 *val = (__le16 *)buf;
 132                 int i;
 133
 134                 for (i = 0; i < SECTOR_SIZE / 2; i++) {
 135                         seq_printf(m, "%04x%c", le16_to_cpu(val[i]),
 136                                         (i % 8) == 7 ? '\n' : ' ');
 137                 }
 138         } else
 139                 seq_putc(m, buf[0]);
 140         kfree(buf);
 141         return 0;
 142 }
 143
 144 static int ide_identify_proc_open(struct inode *inode, struct file *file)
 145 {
 146         return single_open(file, ide_identify_proc_show, PDE(inode)->data);
 147 }
 148
 149 static const struct file_operations ide_identify_proc_fops = {
 150         .owner          = THIS_MODULE,
 151         .open           = ide_identify_proc_open,
 152         .read           = seq_read,
 153         .llseek         = seq_lseek,
 154         .release        = single_release,
 155 };
 156
 157 /**
 158  *      ide_find_setting        -       find a specific setting
 159  *      @st: setting table pointer
 160  *      @name: setting name
 161  *
 162  *      Scan's the setting table for a matching entry and returns
 163  *      this or NULL if no entry is found. The caller must hold the
 164  *      setting semaphore
 165  */
 166
 167 static
 168 const struct ide_proc_devset *ide_find_setting(const struct ide_proc_devset *st,
 169                                                char *name)
 170 {
 171         while (st->name) {
 172                 if (strcmp(st->name, name) == 0)
 173                         break;
 174                 st++;
 175         }
 176         return st->name ? st : NULL;
 177 }
 178
 179 /**
 180  *      ide_read_setting        -       read an IDE setting
 181  *      @drive: drive to read from
 182  *      @setting: drive setting
 183  *
 184  *      Read a drive setting and return the value. The caller
 185  *      must hold the ide_setting_mtx when making this call.
 186  *
 187  *      BUGS: the data return and error are the same return value
 188  *      so an error -EINVAL and true return of the same value cannot
 189  *      be told apart
 190  */
 191
 192 static int ide_read_setting(ide_drive_t *drive,
 193                             const struct ide_proc_devset *setting)
 194 {
 195         const struct ide_devset *ds = setting->setting;
 196         int val = -EINVAL;
 197
 198         if (ds->get)
 199                 val = ds->get(drive);
 200
 201         return val;
 202 }
 203
 204 /**
 205  *      ide_write_setting       -       read an IDE setting
 206  *      @drive: drive to read from
 207  *      @setting: drive setting
 208  *      @val: value
 209  *
 210  *      Write a drive setting if it is possible. The caller
 211  *      must hold the ide_setting_mtx when making this call.
 212  *
 213  *      BUGS: the data return and error are the same return value
 214  *      so an error -EINVAL and true return of the same value cannot
 215  *      be told apart
 216  *
 217  *      FIXME:  This should be changed to enqueue a special request
 218  *      to the driver to change settings, and then wait on a sema for completion.
 219  *      The current scheme of polling is kludgy, though safe enough.
 220  */
 221
 222 static int ide_write_setting(ide_drive_t *drive,
 223                              const struct ide_proc_devset *setting, int val)
 224 {
 225         const struct ide_devset *ds = setting->setting;
 226
 227         if (!capable(CAP_SYS_ADMIN))
 228                 return -EACCES;
 229         if (!ds->set)
 230                 return -EPERM;
 231         if ((ds->flags & DS_SYNC)
 232             && (val < setting->min || val > setting->max))
 233                 return -EINVAL;
 234         return ide_devset_execute(drive, ds, val);
 235 }
 236
 237 ide_devset_get(xfer_rate, current_speed);
 238
 239 static int set_xfer_rate (ide_drive_t *drive, int arg)
 240 {
 241         struct ide_cmd cmd;
 242
 243         if (arg < XFER_PIO_0 || arg > XFER_UDMA_6)
 244                 return -EINVAL;
 245
 246         memset(&cmd, 0, sizeof(cmd));
 247         cmd.tf.command = ATA_CMD_SET_FEATURES;
 248         cmd.tf.feature = SETFEATURES_XFER;
 249         cmd.tf.nsect   = (u8)arg;
 250         cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
 251         cmd.valid.in.tf  = IDE_VALID_NSECT;
 252         cmd.tf_flags   = IDE_TFLAG_SET_XFER;
 253
 254         return ide_no_data_taskfile(drive, &cmd);
 255 }
 256
 257 ide_devset_rw(current_speed, xfer_rate);
 258 ide_devset_rw_field(init_speed, init_speed);
 259 ide_devset_rw_flag(nice1, IDE_DFLAG_NICE1);
 260 ide_devset_rw_field(number, dn);
 261
 262 static const struct ide_proc_devset ide_generic_settings[] = {
 263         IDE_PROC_DEVSET(current_speed, 0, 70),
 264         IDE_PROC_DEVSET(init_speed, 0, 70),
 265         IDE_PROC_DEVSET(io_32bit,  0, 1 + (SUPPORT_VLB_SYNC << 1)),
 266         IDE_PROC_DEVSET(keepsettings, 0, 1),
 267         IDE_PROC_DEVSET(nice1, 0, 1),
 268         IDE_PROC_DEVSET(number, 0, 3),
 269         IDE_PROC_DEVSET(pio_mode, 0, 255),
 270         IDE_PROC_DEVSET(unmaskirq, 0, 1),
 271         IDE_PROC_DEVSET(using_dma, 0, 1),
 272         { NULL },
 273 };
 274
 275 static void proc_ide_settings_warn(void)
 276 {
 277         printk_once(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "
 278                             "obsolete, and will be removed soon!\n");
 279 }
 280
 281 static int ide_settings_proc_show(struct seq_file *m, void *v)
 282 {
 283         const struct ide_proc_devset *setting, *g, *d;
 284         const struct ide_devset *ds;
 285         ide_drive_t     *drive = (ide_drive_t *) m->private;
 286         int             rc, mul_factor, div_factor;
 287
 288         proc_ide_settings_warn();
 289
 290         mutex_lock(&ide_setting_mtx);
 291         g = ide_generic_settings;
 292         d = drive->settings;
 293         seq_printf(m, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
 294         seq_printf(m, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
 295         while (g->name || (d && d->name)) {
 296                 /* read settings in the alphabetical order */
 297                 if (g->name && d && d->name) {
 298                         if (strcmp(d->name, g->name) < 0)
 299                                 setting = d++;
 300                         else
 301                                 setting = g++;
 302                 } else if (d && d->name) {
 303                         setting = d++;
 304                 } else
 305                         setting = g++;
 306                 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
 307                 div_factor = setting->divf ? setting->divf(drive) : 1;
 308                 seq_printf(m, "%-24s", setting->name);
 309                 rc = ide_read_setting(drive, setting);
 310                 if (rc >= 0)
 311                         seq_printf(m, "%-16d", rc * mul_factor / div_factor);
 312                 else
 313                         seq_printf(m, "%-16s", "write-only");
 314                 seq_printf(m, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
 315                 ds = setting->setting;
 316                 if (ds->get)
 317                         seq_printf(m, "r");
 318                 if (ds->set)
 319                         seq_printf(m, "w");
 320                 seq_printf(m, "\n");
 321         }
 322         mutex_unlock(&ide_setting_mtx);
 323         return 0;
 324 }
 325
 326 static int ide_settings_proc_open(struct inode *inode, struct file *file)
 327 {
 328         return single_open(file, ide_settings_proc_show, PDE(inode)->data);
 329 }
 330
 331 #define MAX_LEN 30
 332
 333 static ssize_t ide_settings_proc_write(struct file *file, const char __user *buffer,
 334                                        size_t count, loff_t *pos)
 335 {
 336         ide_drive_t     *drive = (ide_drive_t *) PDE(file->f_path.dentry->d_inode)->data;
 337         char            name[MAX_LEN + 1];
 338         int             for_real = 0, mul_factor, div_factor;
 339         unsigned long   n;
 340
 341         const struct ide_proc_devset *setting;
 342         char *buf, *s;
 343
 344         if (!capable(CAP_SYS_ADMIN))
 345                 return -EACCES;
 346
 347         proc_ide_settings_warn();
 348
 349         if (count >= PAGE_SIZE)
 350                 return -EINVAL;
 351
 352         s = buf = (char *)__get_free_page(GFP_USER);
 353         if (!buf)
 354                 return -ENOMEM;
 355
 356         if (copy_from_user(buf, buffer, count)) {
 357                 free_page((unsigned long)buf);
 358                 return -EFAULT;
 359         }
 360
 361         buf[count] = '\0';
 362
 363         /*
 364          * Skip over leading whitespace
 365          */
 366         while (count && isspace(*s)) {
 367                 --count;
 368                 ++s;
 369         }
 370         /*
 371          * Do one full pass to verify all parameters,
 372          * then do another to actually write the new settings.
 373          */
 374         do {
 375                 char *p = s;
 376                 n = count;
 377                 while (n > 0) {
 378                         unsigned val;
 379                         char *q = p;
 380
 381                         while (n > 0 && *p != ':') {
 382                                 --n;
 383                                 p++;
 384                         }
 385                         if (*p != ':')
 386                                 goto parse_error;
 387                         if (p - q > MAX_LEN)
 388                                 goto parse_error;
 389                         memcpy(name, q, p - q);
 390                         name[p - q] = 0;
 391
 392                         if (n > 0) {
 393                                 --n;
 394                                 p++;
 395                         } else
 396                                 goto parse_error;
 397
 398                         val = simple_strtoul(p, &q, 10);
 399                         n -= q - p;
 400                         p = q;
 401                         if (n > 0 && !isspace(*p))
 402                                 goto parse_error;
 403                         while (n > 0 && isspace(*p)) {
 404                                 --n;
 405                                 ++p;
 406                         }
 407
 408                         mutex_lock(&ide_setting_mtx);
 409                         /* generic settings first, then driver specific ones */
 410                         setting = ide_find_setting(ide_generic_settings, name);
 411                         if (!setting) {
 412                                 if (drive->settings)
 413                                         setting = ide_find_setting(drive->settings, name);
 414                                 if (!setting) {
 415                                         mutex_unlock(&ide_setting_mtx);
 416                                         goto parse_error;
 417                                 }
 418                         }
 419                         if (for_real) {
 420                                 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
 421                                 div_factor = setting->divf ? setting->divf(drive) : 1;
 422                                 ide_write_setting(drive, setting, val * div_factor / mul_factor);
 423                         }
 424                         mutex_unlock(&ide_setting_mtx);
 425                 }
 426         } while (!for_real++);
 427         free_page((unsigned long)buf);
 428         return count;
 429 parse_error:
 430         free_page((unsigned long)buf);
 431         printk("%s(): parse error\n", __func__);
 432         return -EINVAL;
 433 }
 434
 435 static const struct file_operations ide_settings_proc_fops = {
 436         .owner          = THIS_MODULE,
 437         .open           = ide_settings_proc_open,
 438         .read           = seq_read,
 439         .llseek         = seq_lseek,
 440         .release        = single_release,
 441         .write          = ide_settings_proc_write,
 442 };
 443
 444 static int ide_capacity_proc_show(struct seq_file *m, void *v)
 445 {
 446         seq_printf(m, "%llu\n", (long long)0x7fffffff);
 447         return 0;
 448 }
 449
 450 static int ide_capacity_proc_open(struct inode *inode, struct file *file)
 451 {
 452         return single_open(file, ide_capacity_proc_show, NULL);
 453 }
 454
 455 const struct file_operations ide_capacity_proc_fops = {
 456         .owner          = THIS_MODULE,
 457         .open           = ide_capacity_proc_open,
 458         .read           = seq_read,
 459         .llseek         = seq_lseek,
 460         .release        = single_release,
 461 };
 462 EXPORT_SYMBOL_GPL(ide_capacity_proc_fops);
 463
 464 static int ide_geometry_proc_show(struct seq_file *m, void *v)
 465 {
 466         ide_drive_t     *drive = (ide_drive_t *) m->private;
 467
 468         seq_printf(m, "physical     %d/%d/%d\n",
 469                         drive->cyl, drive->head, drive->sect);
 470         seq_printf(m, "logical      %d/%d/%d\n",
 471                         drive->bios_cyl, drive->bios_head, drive->bios_sect);
 472         return 0;
 473 }
 474
 475 static int ide_geometry_proc_open(struct inode *inode, struct file *file)
 476 {
 477         return single_open(file, ide_geometry_proc_show, PDE(inode)->data);
 478 }
 479
 480 const struct file_operations ide_geometry_proc_fops = {
 481         .owner          = THIS_MODULE,
 482         .open           = ide_geometry_proc_open,
 483         .read           = seq_read,
 484         .llseek         = seq_lseek,
 485         .release        = single_release,
 486 };
 487 EXPORT_SYMBOL(ide_geometry_proc_fops);
 488
 489 static int ide_dmodel_proc_show(struct seq_file *seq, void *v)
 490 {
 491         ide_drive_t     *drive = (ide_drive_t *) seq->private;
 492         char            *m = (char *)&drive->id[ATA_ID_PROD];
 493
 494         seq_printf(seq, "%.40s\n", m[0] ? m : "(none)");
 495         return 0;
 496 }
 497
 498 static int ide_dmodel_proc_open(struct inode *inode, struct file *file)
 499 {
 500         return single_open(file, ide_dmodel_proc_show, PDE(inode)->data);
 501 }
 502
 503 static const struct file_operations ide_dmodel_proc_fops = {
 504         .owner          = THIS_MODULE,
 505         .open           = ide_dmodel_proc_open,
 506         .read           = seq_read,
 507         .llseek         = seq_lseek,
 508         .release        = single_release,
 509 };
 510
 511 static int ide_driver_proc_show(struct seq_file *m, void *v)
 512 {
 513         ide_drive_t             *drive = (ide_drive_t *)m->private;
 514         struct device           *dev = &drive->gendev;
 515         struct ide_driver       *ide_drv;
 516
 517         if (dev->driver) {
 518                 ide_drv = to_ide_driver(dev->driver);
 519                 seq_printf(m, "%s version %s\n",
 520                                 dev->driver->name, ide_drv->version);
 521         } else
 522                 seq_printf(m, "ide-default version 0.9.newide\n");
 523         return 0;
 524 }
 525
 526 static int ide_driver_proc_open(struct inode *inode, struct file *file)
 527 {
 528         return single_open(file, ide_driver_proc_show, PDE(inode)->data);
 529 }
 530
 531 static int ide_replace_subdriver(ide_drive_t *drive, const char *driver)
 532 {
 533         struct device *dev = &drive->gendev;
 534         int ret = 1;
 535         int err;
 536
 537         device_release_driver(dev);
 538         /* FIXME: device can still be in use by previous driver */
 539         strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
 540         err = device_attach(dev);
 541         if (err < 0)
 542                 printk(KERN_WARNING "IDE: %s: device_attach error: %d\n",
 543                         __func__, err);
 544         drive->driver_req[0] = 0;
 545         if (dev->driver == NULL) {
 546                 err = device_attach(dev);
 547                 if (err < 0)
 548                         printk(KERN_WARNING
 549                                 "IDE: %s: device_attach(2) error: %d\n",
 550                                 __func__, err);
 551         }
 552         if (dev->driver && !strcmp(dev->driver->name, driver))
 553                 ret = 0;
 554
 555         return ret;
 556 }
 557
 558 static ssize_t ide_driver_proc_write(struct file *file, const char __user *buffer,
 559                                      size_t count, loff_t *pos)
 560 {
 561         ide_drive_t     *drive = (ide_drive_t *) PDE(file->f_path.dentry->d_inode)->data;
 562         char name[32];
 563
 564         if (!capable(CAP_SYS_ADMIN))
 565                 return -EACCES;
 566         if (count > 31)
 567                 count = 31;
 568         if (copy_from_user(name, buffer, count))
 569                 return -EFAULT;
 570         name[count] = '\0';
 571         if (ide_replace_subdriver(drive, name))
 572                 return -EINVAL;
 573         return count;
 574 }
 575
 576 static const struct file_operations ide_driver_proc_fops = {
 577         .owner          = THIS_MODULE,
 578         .open           = ide_driver_proc_open,
 579         .read           = seq_read,
 580         .llseek         = seq_lseek,
 581         .release        = single_release,
 582         .write          = ide_driver_proc_write,
 583 };
 584
 585 static int ide_media_proc_show(struct seq_file *m, void *v)
 586 {
 587         ide_drive_t     *drive = (ide_drive_t *) m->private;
 588         const char      *media;
 589
 590         switch (drive->media) {
 591         case ide_disk:          media = "disk\n";       break;
 592         case ide_cdrom:         media = "cdrom\n";      break;
 593         case ide_tape:          media = "tape\n";       break;
 594         case ide_floppy:        media = "floppy\n";     break;
 595         case ide_optical:       media = "optical\n";    break;
 596         default:                media = "UNKNOWN\n";    break;
 597         }
 598         seq_puts(m, media);
 599         return 0;
 600 }
 601
 602 static int ide_media_proc_open(struct inode *inode, struct file *file)
 603 {
 604         return single_open(file, ide_media_proc_show, PDE(inode)->data);
 605 }
 606
 607 static const struct file_operations ide_media_proc_fops = {
 608         .owner          = THIS_MODULE,
 609         .open           = ide_media_proc_open,
 610         .read           = seq_read,
 611         .llseek         = seq_lseek,
 612         .release        = single_release,
 613 };
 614
 615 static ide_proc_entry_t generic_drive_entries[] = {
 616         { "driver",     S_IFREG|S_IRUGO,         &ide_driver_proc_fops  },
 617         { "identify",   S_IFREG|S_IRUSR,         &ide_identify_proc_fops},
 618         { "media",      S_IFREG|S_IRUGO,         &ide_media_proc_fops   },
 619         { "model",      S_IFREG|S_IRUGO,         &ide_dmodel_proc_fops  },
 620         { "settings",   S_IFREG|S_IRUSR|S_IWUSR, &ide_settings_proc_fops},
 621         {}
 622 };
 623
 624 static void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
 625 {
 626         struct proc_dir_entry *ent;
 627
 628         if (!dir || !p)
 629                 return;
 630         while (p->name != NULL) {
 631                 ent = proc_create_data(p->name, p->mode, dir, p->proc_fops, data);
 632                 if (!ent) return;
 633                 p++;
 634         }
 635 }
 636
 637 static void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
 638 {
 639         if (!dir || !p)
 640                 return;
 641         while (p->name != NULL) {
 642                 remove_proc_entry(p->name, dir);
 643                 p++;
 644         }
 645 }
 646
 647 void ide_proc_register_driver(ide_drive_t *drive, struct ide_driver *driver)
 648 {
 649         mutex_lock(&ide_setting_mtx);
 650         drive->settings = driver->proc_devsets(drive);
 651         mutex_unlock(&ide_setting_mtx);
 652
 653         ide_add_proc_entries(drive->proc, driver->proc_entries(drive), drive);
 654 }
 655
 656 EXPORT_SYMBOL(ide_proc_register_driver);
 657
 658 /**
 659  *      ide_proc_unregister_driver      -       remove driver specific data
 660  *      @drive: drive
 661  *      @driver: driver
 662  *
 663  *      Clean up the driver specific /proc files and IDE settings
 664  *      for a given drive.
 665  *
 666  *      Takes ide_setting_mtx.
 667  */
 668
 669 void ide_proc_unregister_driver(ide_drive_t *drive, struct ide_driver *driver)
 670 {
 671         ide_remove_proc_entries(drive->proc, driver->proc_entries(drive));
 672
 673         mutex_lock(&ide_setting_mtx);
 674         /*
 675          * ide_setting_mtx protects both the settings list and the use
 676          * of settings (we cannot take a setting out that is being used).
 677          */
 678         drive->settings = NULL;
 679         mutex_unlock(&ide_setting_mtx);
 680 }
 681 EXPORT_SYMBOL(ide_proc_unregister_driver);
 682
 683 void ide_proc_port_register_devices(ide_hwif_t *hwif)
 684 {
 685         struct proc_dir_entry *ent;
 686         struct proc_dir_entry *parent = hwif->proc;
 687         ide_drive_t *drive;
 688         char name[64];
 689         int i;
 690
 691         ide_port_for_each_dev(i, drive, hwif) {
 692                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 693                         continue;
 694
 695                 drive->proc = proc_mkdir(drive->name, parent);
 696                 if (drive->proc)
 697                         ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
 698                 sprintf(name, "ide%d/%s", (drive->name[2]-'a')/2, drive->name);
 699                 ent = proc_symlink(drive->name, proc_ide_root, name);
 700                 if (!ent) return;
 701         }
 702 }
 703
 704 void ide_proc_unregister_device(ide_drive_t *drive)
 705 {
 706         if (drive->proc) {
 707                 ide_remove_proc_entries(drive->proc, generic_drive_entries);
 708                 remove_proc_entry(drive->name, proc_ide_root);
 709                 remove_proc_entry(drive->name, drive->hwif->proc);
 710                 drive->proc = NULL;
 711         }
 712 }
 713
 714 static ide_proc_entry_t hwif_entries[] = {
 715         { "channel",    S_IFREG|S_IRUGO,        &ide_channel_proc_fops  },
 716         { "mate",       S_IFREG|S_IRUGO,        &ide_mate_proc_fops     },
 717         { "model",      S_IFREG|S_IRUGO,        &ide_imodel_proc_fops   },
 718         {}
 719 };
 720
 721 void ide_proc_register_port(ide_hwif_t *hwif)
 722 {
 723         if (!hwif->proc) {
 724                 hwif->proc = proc_mkdir(hwif->name, proc_ide_root);
 725
 726                 if (!hwif->proc)
 727                         return;
 728
 729                 ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
 730         }
 731 }
 732
 733 void ide_proc_unregister_port(ide_hwif_t *hwif)
 734 {
 735         if (hwif->proc) {
 736                 ide_remove_proc_entries(hwif->proc, hwif_entries);
 737                 remove_proc_entry(hwif->name, proc_ide_root);
 738                 hwif->proc = NULL;
 739         }
 740 }
 741
 742 static int proc_print_driver(struct device_driver *drv, void *data)
 743 {
 744         struct ide_driver *ide_drv = to_ide_driver(drv);
 745         struct seq_file *s = data;
 746
 747         seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);
 748
 749         return 0;
 750 }
 751
 752 static int ide_drivers_show(struct seq_file *s, void *p)
 753 {
 754         int err;
 755
 756         err = bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
 757         if (err < 0)
 758                 printk(KERN_WARNING "IDE: %s: bus_for_each_drv error: %d\n",
 759                         __func__, err);
 760         return 0;
 761 }
 762
 763 static int ide_drivers_open(struct inode *inode, struct file *file)
 764 {
 765         return single_open(file, &ide_drivers_show, NULL);
 766 }
 767
 768 static const struct file_operations ide_drivers_operations = {
 769         .owner          = THIS_MODULE,
 770         .open           = ide_drivers_open,
 771         .read           = seq_read,
 772         .llseek         = seq_lseek,
 773         .release        = single_release,
 774 };
 775
 776 void proc_ide_create(void)
 777 {
 778         proc_ide_root = proc_mkdir("ide", NULL);
 779
 780         if (!proc_ide_root)
 781                 return;
 782
 783         proc_create("drivers", 0, proc_ide_root, &ide_drivers_operations);
 784 }
 785
 786 void proc_ide_destroy(void)
 787 {
 788         remove_proc_entry("drivers", proc_ide_root);
 789         remove_proc_entry("ide", NULL);
 790 }