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   1 /*
   2  *  linux/drivers/ide/ide-proc.c        Version 1.05    Mar 05, 2003
   3  *
   4  *  Copyright (C) 1997-1998     Mark Lord
   5  *  Copyright (C) 2003          Red Hat <alan@redhat.com>
   6  */
   7
   8 /*
   9  * This is the /proc/ide/ filesystem implementation.
  10  *
  11  * 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/config.h>
  26 #include <linux/module.h>
  27
  28 #include <asm/uaccess.h>
  29 #include <linux/errno.h>
  30 #include <linux/sched.h>
  31 #include <linux/proc_fs.h>
  32 #include <linux/stat.h>
  33 #include <linux/mm.h>
  34 #include <linux/pci.h>
  35 #include <linux/ctype.h>
  36 #include <linux/hdreg.h>
  37 #include <linux/ide.h>
  38 #include <linux/seq_file.h>
  39
  40 #include <asm/io.h>
  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         /*
  50          * Neither ide_unknown nor ide_forced should be set at this point.
  51          */
  52         switch (hwif->chipset) {
  53                 case ide_generic:       name = "generic";       break;
  54                 case ide_pci:           name = "pci";           break;
  55                 case ide_cmd640:        name = "cmd640";        break;
  56                 case ide_dtc2278:       name = "dtc2278";       break;
  57                 case ide_ali14xx:       name = "ali14xx";       break;
  58                 case ide_qd65xx:        name = "qd65xx";        break;
  59                 case ide_umc8672:       name = "umc8672";       break;
  60                 case ide_ht6560b:       name = "ht6560b";       break;
  61                 case ide_rz1000:        name = "rz1000";        break;
  62                 case ide_trm290:        name = "trm290";        break;
  63                 case ide_cmd646:        name = "cmd646";        break;
  64                 case ide_cy82c693:      name = "cy82c693";      break;
  65                 case ide_4drives:       name = "4drives";       break;
  66                 case ide_pmac:          name = "mac-io";        break;
  67                 case ide_au1xxx:        name = "au1xxx";        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 static void proc_ide_settings_warn(void)
 127 {
 128         static int warned = 0;
 129
 130         if (warned)
 131                 return;
 132
 133         printk(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "
 134                             "obsolete, and will be removed soon!\n");
 135         warned = 1;
 136 }
 137
 138 static int proc_ide_read_settings
 139         (char *page, char **start, off_t off, int count, int *eof, void *data)
 140 {
 141         ide_drive_t     *drive = (ide_drive_t *) data;
 142         ide_settings_t  *setting = (ide_settings_t *) drive->settings;
 143         char            *out = page;
 144         int             len, rc, mul_factor, div_factor;
 145
 146         proc_ide_settings_warn();
 147
 148         down(&ide_setting_sem);
 149         out += sprintf(out, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
 150         out += sprintf(out, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
 151         while(setting) {
 152                 mul_factor = setting->mul_factor;
 153                 div_factor = setting->div_factor;
 154                 out += sprintf(out, "%-24s", setting->name);
 155                 if ((rc = ide_read_setting(drive, setting)) >= 0)
 156                         out += sprintf(out, "%-16d", rc * mul_factor / div_factor);
 157                 else
 158                         out += sprintf(out, "%-16s", "write-only");
 159                 out += sprintf(out, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
 160                 if (setting->rw & SETTING_READ)
 161                         out += sprintf(out, "r");
 162                 if (setting->rw & SETTING_WRITE)
 163                         out += sprintf(out, "w");
 164                 out += sprintf(out, "\n");
 165                 setting = setting->next;
 166         }
 167         len = out - page;
 168         up(&ide_setting_sem);
 169         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 170 }
 171
 172 #define MAX_LEN 30
 173
 174 static int proc_ide_write_settings(struct file *file, const char __user *buffer,
 175                                    unsigned long count, void *data)
 176 {
 177         ide_drive_t     *drive = (ide_drive_t *) data;
 178         char            name[MAX_LEN + 1];
 179         int             for_real = 0;
 180         unsigned long   n;
 181         ide_settings_t  *setting;
 182         char *buf, *s;
 183
 184         if (!capable(CAP_SYS_ADMIN))
 185                 return -EACCES;
 186
 187         proc_ide_settings_warn();
 188
 189         if (count >= PAGE_SIZE)
 190                 return -EINVAL;
 191
 192         s = buf = (char *)__get_free_page(GFP_USER);
 193         if (!buf)
 194                 return -ENOMEM;
 195
 196         if (copy_from_user(buf, buffer, count)) {
 197                 free_page((unsigned long)buf);
 198                 return -EFAULT;
 199         }
 200
 201         buf[count] = '\0';
 202
 203         /*
 204          * Skip over leading whitespace
 205          */
 206         while (count && isspace(*s)) {
 207                 --count;
 208                 ++s;
 209         }
 210         /*
 211          * Do one full pass to verify all parameters,
 212          * then do another to actually write the new settings.
 213          */
 214         do {
 215                 char *p = s;
 216                 n = count;
 217                 while (n > 0) {
 218                         unsigned val;
 219                         char *q = p;
 220
 221                         while (n > 0 && *p != ':') {
 222                                 --n;
 223                                 p++;
 224                         }
 225                         if (*p != ':')
 226                                 goto parse_error;
 227                         if (p - q > MAX_LEN)
 228                                 goto parse_error;
 229                         memcpy(name, q, p - q);
 230                         name[p - q] = 0;
 231
 232                         if (n > 0) {
 233                                 --n;
 234                                 p++;
 235                         } else
 236                                 goto parse_error;
 237
 238                         val = simple_strtoul(p, &q, 10);
 239                         n -= q - p;
 240                         p = q;
 241                         if (n > 0 && !isspace(*p))
 242                                 goto parse_error;
 243                         while (n > 0 && isspace(*p)) {
 244                                 --n;
 245                                 ++p;
 246                         }
 247
 248                         down(&ide_setting_sem);
 249                         setting = ide_find_setting_by_name(drive, name);
 250                         if (!setting)
 251                         {
 252                                 up(&ide_setting_sem);
 253                                 goto parse_error;
 254                         }
 255                         if (for_real)
 256                                 ide_write_setting(drive, setting, val * setting->div_factor / setting->mul_factor);
 257                         up(&ide_setting_sem);
 258                 }
 259         } while (!for_real++);
 260         free_page((unsigned long)buf);
 261         return count;
 262 parse_error:
 263         free_page((unsigned long)buf);
 264         printk("proc_ide_write_settings(): parse error\n");
 265         return -EINVAL;
 266 }
 267
 268 int proc_ide_read_capacity
 269         (char *page, char **start, off_t off, int count, int *eof, void *data)
 270 {
 271         int len = sprintf(page,"%llu\n", (long long)0x7fffffff);
 272         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 273 }
 274
 275 EXPORT_SYMBOL_GPL(proc_ide_read_capacity);
 276
 277 int proc_ide_read_geometry
 278         (char *page, char **start, off_t off, int count, int *eof, void *data)
 279 {
 280         ide_drive_t     *drive = (ide_drive_t *) data;
 281         char            *out = page;
 282         int             len;
 283
 284         out += sprintf(out,"physical     %d/%d/%d\n",
 285                         drive->cyl, drive->head, drive->sect);
 286         out += sprintf(out,"logical      %d/%d/%d\n",
 287                         drive->bios_cyl, drive->bios_head, drive->bios_sect);
 288
 289         len = out - page;
 290         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 291 }
 292
 293 EXPORT_SYMBOL(proc_ide_read_geometry);
 294
 295 static int proc_ide_read_dmodel
 296         (char *page, char **start, off_t off, int count, int *eof, void *data)
 297 {
 298         ide_drive_t     *drive = (ide_drive_t *) data;
 299         struct hd_driveid *id = drive->id;
 300         int             len;
 301
 302         len = sprintf(page, "%.40s\n",
 303                 (id && id->model[0]) ? (char *)id->model : "(none)");
 304         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 305 }
 306
 307 static int proc_ide_read_driver
 308         (char *page, char **start, off_t off, int count, int *eof, void *data)
 309 {
 310         ide_drive_t     *drive = (ide_drive_t *) data;
 311         struct device   *dev = &drive->gendev;
 312         ide_driver_t    *ide_drv;
 313         int             len;
 314
 315         down_read(&dev->bus->subsys.rwsem);
 316         if (dev->driver) {
 317                 ide_drv = container_of(dev->driver, ide_driver_t, gen_driver);
 318                 len = sprintf(page, "%s version %s\n",
 319                                 dev->driver->name, ide_drv->version);
 320         } else
 321                 len = sprintf(page, "ide-default version 0.9.newide\n");
 322         up_read(&dev->bus->subsys.rwsem);
 323         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 324 }
 325
 326 static int ide_replace_subdriver(ide_drive_t *drive, const char *driver)
 327 {
 328         struct device *dev = &drive->gendev;
 329         int ret = 1;
 330
 331         down_write(&dev->bus->subsys.rwsem);
 332         device_release_driver(dev);
 333         /* FIXME: device can still be in use by previous driver */
 334         strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
 335         device_attach(dev);
 336         drive->driver_req[0] = 0;
 337         if (dev->driver == NULL)
 338                 device_attach(dev);
 339         if (dev->driver && !strcmp(dev->driver->name, driver))
 340                 ret = 0;
 341         up_write(&dev->bus->subsys.rwsem);
 342
 343         return ret;
 344 }
 345
 346 static int proc_ide_write_driver
 347         (struct file *file, const char __user *buffer, unsigned long count, void *data)
 348 {
 349         ide_drive_t     *drive = (ide_drive_t *) data;
 350         char name[32];
 351
 352         if (!capable(CAP_SYS_ADMIN))
 353                 return -EACCES;
 354         if (count > 31)
 355                 count = 31;
 356         if (copy_from_user(name, buffer, count))
 357                 return -EFAULT;
 358         name[count] = '\0';
 359         if (ide_replace_subdriver(drive, name))
 360                 return -EINVAL;
 361         return count;
 362 }
 363
 364 static int proc_ide_read_media
 365         (char *page, char **start, off_t off, int count, int *eof, void *data)
 366 {
 367         ide_drive_t     *drive = (ide_drive_t *) data;
 368         const char      *media;
 369         int             len;
 370
 371         switch (drive->media) {
 372                 case ide_disk:  media = "disk\n";
 373                                 break;
 374                 case ide_cdrom: media = "cdrom\n";
 375                                 break;
 376                 case ide_tape:  media = "tape\n";
 377                                 break;
 378                 case ide_floppy:media = "floppy\n";
 379                                 break;
 380                 default:        media = "UNKNOWN\n";
 381                                 break;
 382         }
 383         strcpy(page,media);
 384         len = strlen(media);
 385         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 386 }
 387
 388 static ide_proc_entry_t generic_drive_entries[] = {
 389         { "driver",     S_IFREG|S_IRUGO,        proc_ide_read_driver,   proc_ide_write_driver },
 390         { "identify",   S_IFREG|S_IRUSR,        proc_ide_read_identify, NULL },
 391         { "media",      S_IFREG|S_IRUGO,        proc_ide_read_media,    NULL },
 392         { "model",      S_IFREG|S_IRUGO,        proc_ide_read_dmodel,   NULL },
 393         { "settings",   S_IFREG|S_IRUSR|S_IWUSR,proc_ide_read_settings, proc_ide_write_settings },
 394         { NULL, 0, NULL, NULL }
 395 };
 396
 397 void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
 398 {
 399         struct proc_dir_entry *ent;
 400
 401         if (!dir || !p)
 402                 return;
 403         while (p->name != NULL) {
 404                 ent = create_proc_entry(p->name, p->mode, dir);
 405                 if (!ent) return;
 406                 ent->nlink = 1;
 407                 ent->data = data;
 408                 ent->read_proc = p->read_proc;
 409                 ent->write_proc = p->write_proc;
 410                 p++;
 411         }
 412 }
 413
 414 void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
 415 {
 416         if (!dir || !p)
 417                 return;
 418         while (p->name != NULL) {
 419                 remove_proc_entry(p->name, dir);
 420                 p++;
 421         }
 422 }
 423
 424 static void create_proc_ide_drives(ide_hwif_t *hwif)
 425 {
 426         int     d;
 427         struct proc_dir_entry *ent;
 428         struct proc_dir_entry *parent = hwif->proc;
 429         char name[64];
 430
 431         for (d = 0; d < MAX_DRIVES; d++) {
 432                 ide_drive_t *drive = &hwif->drives[d];
 433
 434                 if (!drive->present)
 435                         continue;
 436                 if (drive->proc)
 437                         continue;
 438
 439                 drive->proc = proc_mkdir(drive->name, parent);
 440                 if (drive->proc)
 441                         ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
 442                 sprintf(name,"ide%d/%s", (drive->name[2]-'a')/2, drive->name);
 443                 ent = proc_symlink(drive->name, proc_ide_root, name);
 444                 if (!ent) return;
 445         }
 446 }
 447
 448 static void destroy_proc_ide_device(ide_hwif_t *hwif, ide_drive_t *drive)
 449 {
 450         if (drive->proc) {
 451                 ide_remove_proc_entries(drive->proc, generic_drive_entries);
 452                 remove_proc_entry(drive->name, proc_ide_root);
 453                 remove_proc_entry(drive->name, hwif->proc);
 454                 drive->proc = NULL;
 455         }
 456 }
 457
 458 static void destroy_proc_ide_drives(ide_hwif_t *hwif)
 459 {
 460         int     d;
 461
 462         for (d = 0; d < MAX_DRIVES; d++) {
 463                 ide_drive_t *drive = &hwif->drives[d];
 464                 if (drive->proc)
 465                         destroy_proc_ide_device(hwif, drive);
 466         }
 467 }
 468
 469 static ide_proc_entry_t hwif_entries[] = {
 470         { "channel",    S_IFREG|S_IRUGO,        proc_ide_read_channel,  NULL },
 471         { "mate",       S_IFREG|S_IRUGO,        proc_ide_read_mate,     NULL },
 472         { "model",      S_IFREG|S_IRUGO,        proc_ide_read_imodel,   NULL },
 473         { NULL, 0, NULL, NULL }
 474 };
 475
 476 void create_proc_ide_interfaces(void)
 477 {
 478         int     h;
 479
 480         for (h = 0; h < MAX_HWIFS; h++) {
 481                 ide_hwif_t *hwif = &ide_hwifs[h];
 482
 483                 if (!hwif->present)
 484                         continue;
 485                 if (!hwif->proc) {
 486                         hwif->proc = proc_mkdir(hwif->name, proc_ide_root);
 487                         if (!hwif->proc)
 488                                 return;
 489                         ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
 490                 }
 491                 create_proc_ide_drives(hwif);
 492         }
 493 }
 494
 495 EXPORT_SYMBOL(create_proc_ide_interfaces);
 496
 497 #ifdef CONFIG_BLK_DEV_IDEPCI
 498 void ide_pci_create_host_proc(const char *name, get_info_t *get_info)
 499 {
 500         create_proc_info_entry(name, 0, proc_ide_root, get_info);
 501 }
 502
 503 EXPORT_SYMBOL_GPL(ide_pci_create_host_proc);
 504 #endif
 505
 506 void destroy_proc_ide_interface(ide_hwif_t *hwif)
 507 {
 508         if (hwif->proc) {
 509                 destroy_proc_ide_drives(hwif);
 510                 ide_remove_proc_entries(hwif->proc, hwif_entries);
 511                 remove_proc_entry(hwif->name, proc_ide_root);
 512                 hwif->proc = NULL;
 513         }
 514 }
 515
 516 static int proc_print_driver(struct device_driver *drv, void *data)
 517 {
 518         ide_driver_t *ide_drv = container_of(drv, ide_driver_t, gen_driver);
 519         struct seq_file *s = data;
 520
 521         seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);
 522
 523         return 0;
 524 }
 525
 526 static int ide_drivers_show(struct seq_file *s, void *p)
 527 {
 528         bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
 529         return 0;
 530 }
 531
 532 static int ide_drivers_open(struct inode *inode, struct file *file)
 533 {
 534         return single_open(file, &ide_drivers_show, NULL);
 535 }
 536
 537 static struct file_operations ide_drivers_operations = {
 538         .open           = ide_drivers_open,
 539         .read           = seq_read,
 540         .llseek         = seq_lseek,
 541         .release        = single_release,
 542 };
 543
 544 void proc_ide_create(void)
 545 {
 546         struct proc_dir_entry *entry;
 547
 548         if (!proc_ide_root)
 549                 return;
 550
 551         create_proc_ide_interfaces();
 552
 553         entry = create_proc_entry("drivers", 0, proc_ide_root);
 554         if (entry)
 555                 entry->proc_fops = &ide_drivers_operations;
 556 }
 557
 558 void proc_ide_destroy(void)
 559 {
 560         remove_proc_entry("drivers", proc_ide_root);
 561         remove_proc_entry("ide", NULL);
 562 }