drivers/parport/procfs.c

   1 /* Sysctl interface for parport devices.
   2  *
   3  * Authors: David Campbell
   4  *          Tim Waugh <tim@cyberelk.demon.co.uk>
   5  *          Philip Blundell <philb@gnu.org>
   6  *          Andrea Arcangeli
   7  *          Riccardo Facchetti <fizban@tin.it>
   8  *
   9  * based on work by Grant Guenther <grant@torque.net>
  10  *              and Philip Blundell
  11  *
  12  * Cleaned up include files - Russell King <linux@arm.uk.linux.org>
  13  */
  14
  15 #include <linux/string.h>
  16 #include <linux/init.h>
  17 #include <linux/module.h>
  18 #include <linux/errno.h>
  19 #include <linux/kernel.h>
  20 #include <linux/slab.h>
  21 #include <linux/parport.h>
  22 #include <linux/ctype.h>
  23 #include <linux/sysctl.h>
  24 #include <linux/device.h>
  25
  26 #include <linux/uaccess.h>
  27
  28 #if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS)
  29
  30 #define PARPORT_MIN_TIMESLICE_VALUE 1ul
  31 #define PARPORT_MAX_TIMESLICE_VALUE ((unsigned long) HZ)
  32 #define PARPORT_MIN_SPINTIME_VALUE 1
  33 #define PARPORT_MAX_SPINTIME_VALUE 1000
  34
  35 static int do_active_device(struct ctl_table *table, int write,
  36                       void __user *result, size_t *lenp, loff_t *ppos)
  37 {
  38         struct parport *port = (struct parport *)table->extra1;
  39         char buffer[256];
  40         struct pardevice *dev;
  41         int len = 0;
  42
  43         if (write)              /* can't happen anyway */
  44                 return -EACCES;
  45
  46         if (*ppos) {
  47                 *lenp = 0;
  48                 return 0;
  49         }
  50
  51         for (dev = port->devices; dev ; dev = dev->next) {
  52                 if(dev == port->cad) {
  53                         len += sprintf(buffer, "%s\n", dev->name);
  54                 }
  55         }
  56
  57         if(!len) {
  58                 len += sprintf(buffer, "%s\n", "none");
  59         }
  60
  61         if (len > *lenp)
  62                 len = *lenp;
  63         else
  64                 *lenp = len;
  65
  66         *ppos += len;
  67
  68         return copy_to_user(result, buffer, len) ? -EFAULT : 0;
  69 }
  70
  71 #ifdef CONFIG_PARPORT_1284
  72 static int do_autoprobe(struct ctl_table *table, int write,
  73                         void __user *result, size_t *lenp, loff_t *ppos)
  74 {
  75         struct parport_device_info *info = table->extra2;
  76         const char *str;
  77         char buffer[256];
  78         int len = 0;
  79
  80         if (write) /* permissions stop this */
  81                 return -EACCES;
  82
  83         if (*ppos) {
  84                 *lenp = 0;
  85                 return 0;
  86         }
  87
  88         if ((str = info->class_name) != NULL)
  89                 len += sprintf (buffer + len, "CLASS:%s;\n", str);
  90
  91         if ((str = info->model) != NULL)
  92                 len += sprintf (buffer + len, "MODEL:%s;\n", str);
  93
  94         if ((str = info->mfr) != NULL)
  95                 len += sprintf (buffer + len, "MANUFACTURER:%s;\n", str);
  96
  97         if ((str = info->description) != NULL)
  98                 len += sprintf (buffer + len, "DESCRIPTION:%s;\n", str);
  99
 100         if ((str = info->cmdset) != NULL)
 101                 len += sprintf (buffer + len, "COMMAND SET:%s;\n", str);
 102
 103         if (len > *lenp)
 104                 len = *lenp;
 105         else
 106                 *lenp = len;
 107
 108         *ppos += len;
 109
 110         return copy_to_user (result, buffer, len) ? -EFAULT : 0;
 111 }
 112 #endif /* IEEE1284.3 support. */
 113
 114 static int do_hardware_base_addr(struct ctl_table *table, int write,
 115                                  void __user *result,
 116                                  size_t *lenp, loff_t *ppos)
 117 {
 118         struct parport *port = (struct parport *)table->extra1;
 119         char buffer[20];
 120         int len = 0;
 121
 122         if (*ppos) {
 123                 *lenp = 0;
 124                 return 0;
 125         }
 126
 127         if (write) /* permissions prevent this anyway */
 128                 return -EACCES;
 129
 130         len += sprintf (buffer, "%lu\t%lu\n", port->base, port->base_hi);
 131
 132         if (len > *lenp)
 133                 len = *lenp;
 134         else
 135                 *lenp = len;
 136
 137         *ppos += len;
 138
 139         return copy_to_user(result, buffer, len) ? -EFAULT : 0;
 140 }
 141
 142 static int do_hardware_irq(struct ctl_table *table, int write,
 143                            void __user *result,
 144                            size_t *lenp, loff_t *ppos)
 145 {
 146         struct parport *port = (struct parport *)table->extra1;
 147         char buffer[20];
 148         int len = 0;
 149
 150         if (*ppos) {
 151                 *lenp = 0;
 152                 return 0;
 153         }
 154
 155         if (write) /* permissions prevent this anyway */
 156                 return -EACCES;
 157
 158         len += sprintf (buffer, "%d\n", port->irq);
 159
 160         if (len > *lenp)
 161                 len = *lenp;
 162         else
 163                 *lenp = len;
 164
 165         *ppos += len;
 166
 167         return copy_to_user(result, buffer, len) ? -EFAULT : 0;
 168 }
 169
 170 static int do_hardware_dma(struct ctl_table *table, int write,
 171                            void __user *result,
 172                            size_t *lenp, loff_t *ppos)
 173 {
 174         struct parport *port = (struct parport *)table->extra1;
 175         char buffer[20];
 176         int len = 0;
 177
 178         if (*ppos) {
 179                 *lenp = 0;
 180                 return 0;
 181         }
 182
 183         if (write) /* permissions prevent this anyway */
 184                 return -EACCES;
 185
 186         len += sprintf (buffer, "%d\n", port->dma);
 187
 188         if (len > *lenp)
 189                 len = *lenp;
 190         else
 191                 *lenp = len;
 192
 193         *ppos += len;
 194
 195         return copy_to_user(result, buffer, len) ? -EFAULT : 0;
 196 }
 197
 198 static int do_hardware_modes(struct ctl_table *table, int write,
 199                              void __user *result,
 200                              size_t *lenp, loff_t *ppos)
 201 {
 202         struct parport *port = (struct parport *)table->extra1;
 203         char buffer[40];
 204         int len = 0;
 205
 206         if (*ppos) {
 207                 *lenp = 0;
 208                 return 0;
 209         }
 210
 211         if (write) /* permissions prevent this anyway */
 212                 return -EACCES;
 213
 214         {
 215 #define printmode(x) {if(port->modes&PARPORT_MODE_##x){len+=sprintf(buffer+len,"%s%s",f?",":"",#x);f++;}}
 216                 int f = 0;
 217                 printmode(PCSPP);
 218                 printmode(TRISTATE);
 219                 printmode(COMPAT);
 220                 printmode(EPP);
 221                 printmode(ECP);
 222                 printmode(DMA);
 223 #undef printmode
 224         }
 225         buffer[len++] = '\n';
 226
 227         if (len > *lenp)
 228                 len = *lenp;
 229         else
 230                 *lenp = len;
 231
 232         *ppos += len;
 233
 234         return copy_to_user(result, buffer, len) ? -EFAULT : 0;
 235 }
 236
 237 #define PARPORT_PORT_DIR(CHILD) { .procname = NULL, .mode = 0555, .child = CHILD }
 238 #define PARPORT_PARPORT_DIR(CHILD) { .procname = "parport", \
 239                                      .mode = 0555, .child = CHILD }
 240 #define PARPORT_DEV_DIR(CHILD) { .procname = "dev", .mode = 0555, .child = CHILD }
 241 #define PARPORT_DEVICES_ROOT_DIR  {  .procname = "devices", \
 242                                     .mode = 0555, .child = NULL }
 243
 244 static const unsigned long parport_min_timeslice_value =
 245 PARPORT_MIN_TIMESLICE_VALUE;
 246
 247 static const unsigned long parport_max_timeslice_value =
 248 PARPORT_MAX_TIMESLICE_VALUE;
 249
 250 static const  int parport_min_spintime_value =
 251 PARPORT_MIN_SPINTIME_VALUE;
 252
 253 static const int parport_max_spintime_value =
 254 PARPORT_MAX_SPINTIME_VALUE;
 255
 256
 257 struct parport_sysctl_table {
 258         struct ctl_table_header *sysctl_header;
 259         struct ctl_table vars[12];
 260         struct ctl_table device_dir[2];
 261         struct ctl_table port_dir[2];
 262         struct ctl_table parport_dir[2];
 263         struct ctl_table dev_dir[2];
 264 };
 265
 266 static const struct parport_sysctl_table parport_sysctl_template = {
 267         .sysctl_header = NULL,
 268         {
 269                 {
 270                         .procname       = "spintime",
 271                         .data           = NULL,
 272                         .maxlen         = sizeof(int),
 273                         .mode           = 0644,
 274                         .proc_handler   = proc_dointvec_minmax,
 275                         .extra1         = (void*) &parport_min_spintime_value,
 276                         .extra2         = (void*) &parport_max_spintime_value
 277                 },
 278                 {
 279                         .procname       = "base-addr",
 280                         .data           = NULL,
 281                         .maxlen         = 0,
 282                         .mode           = 0444,
 283                         .proc_handler   = do_hardware_base_addr
 284                 },
 285                 {
 286                         .procname       = "irq",
 287                         .data           = NULL,
 288                         .maxlen         = 0,
 289                         .mode           = 0444,
 290                         .proc_handler   = do_hardware_irq
 291                 },
 292                 {
 293                         .procname       = "dma",
 294                         .data           = NULL,
 295                         .maxlen         = 0,
 296                         .mode           = 0444,
 297                         .proc_handler   = do_hardware_dma
 298                 },
 299                 {
 300                         .procname       = "modes",
 301                         .data           = NULL,
 302                         .maxlen         = 0,
 303                         .mode           = 0444,
 304                         .proc_handler   = do_hardware_modes
 305                 },
 306                 PARPORT_DEVICES_ROOT_DIR,
 307 #ifdef CONFIG_PARPORT_1284
 308                 {
 309                         .procname       = "autoprobe",
 310                         .data           = NULL,
 311                         .maxlen         = 0,
 312                         .mode           = 0444,
 313                         .proc_handler   = do_autoprobe
 314                 },
 315                 {
 316                         .procname       = "autoprobe0",
 317                         .data           = NULL,
 318                         .maxlen         = 0,
 319                         .mode           = 0444,
 320                         .proc_handler   = do_autoprobe
 321                 },
 322                 {
 323                         .procname       = "autoprobe1",
 324                         .data           = NULL,
 325                         .maxlen         = 0,
 326                         .mode           = 0444,
 327                         .proc_handler   = do_autoprobe
 328                 },
 329                 {
 330                         .procname       = "autoprobe2",
 331                         .data           = NULL,
 332                         .maxlen         = 0,
 333                         .mode           = 0444,
 334                         .proc_handler   = do_autoprobe
 335                 },
 336                 {
 337                         .procname       = "autoprobe3",
 338                         .data           = NULL,
 339                         .maxlen         = 0,
 340                         .mode           = 0444,
 341                         .proc_handler   = do_autoprobe
 342                 },
 343 #endif /* IEEE 1284 support */
 344                 {}
 345         },
 346         {
 347                 {
 348                         .procname       = "active",
 349                         .data           = NULL,
 350                         .maxlen         = 0,
 351                         .mode           = 0444,
 352                         .proc_handler   = do_active_device
 353                 },
 354                 {}
 355         },
 356         {
 357                 PARPORT_PORT_DIR(NULL),
 358                 {}
 359         },
 360         {
 361                 PARPORT_PARPORT_DIR(NULL),
 362                 {}
 363         },
 364         {
 365                 PARPORT_DEV_DIR(NULL),
 366                 {}
 367         }
 368 };
 369
 370 struct parport_device_sysctl_table
 371 {
 372         struct ctl_table_header *sysctl_header;
 373         struct ctl_table vars[2];
 374         struct ctl_table device_dir[2];
 375         struct ctl_table devices_root_dir[2];
 376         struct ctl_table port_dir[2];
 377         struct ctl_table parport_dir[2];
 378         struct ctl_table dev_dir[2];
 379 };
 380
 381 static const struct parport_device_sysctl_table
 382 parport_device_sysctl_template = {
 383         .sysctl_header = NULL,
 384         {
 385                 {
 386                         .procname       = "timeslice",
 387                         .data           = NULL,
 388                         .maxlen         = sizeof(unsigned long),
 389                         .mode           = 0644,
 390                         .proc_handler   = proc_doulongvec_ms_jiffies_minmax,
 391                         .extra1         = (void*) &parport_min_timeslice_value,
 392                         .extra2         = (void*) &parport_max_timeslice_value
 393                 },
 394         },
 395         {
 396                 {
 397                         .procname       = NULL,
 398                         .data           = NULL,
 399                         .maxlen         = 0,
 400                         .mode           = 0555,
 401                         .child          = NULL
 402                 },
 403                 {}
 404         },
 405         {
 406                 PARPORT_DEVICES_ROOT_DIR,
 407                 {}
 408         },
 409         {
 410                 PARPORT_PORT_DIR(NULL),
 411                 {}
 412         },
 413         {
 414                 PARPORT_PARPORT_DIR(NULL),
 415                 {}
 416         },
 417         {
 418                 PARPORT_DEV_DIR(NULL),
 419                 {}
 420         }
 421 };
 422
 423 struct parport_default_sysctl_table
 424 {
 425         struct ctl_table_header *sysctl_header;
 426         struct ctl_table vars[3];
 427         struct ctl_table default_dir[2];
 428         struct ctl_table parport_dir[2];
 429         struct ctl_table dev_dir[2];
 430 };
 431
 432 static struct parport_default_sysctl_table
 433 parport_default_sysctl_table = {
 434         .sysctl_header  = NULL,
 435         {
 436                 {
 437                         .procname       = "timeslice",
 438                         .data           = &parport_default_timeslice,
 439                         .maxlen         = sizeof(parport_default_timeslice),
 440                         .mode           = 0644,
 441                         .proc_handler   = proc_doulongvec_ms_jiffies_minmax,
 442                         .extra1         = (void*) &parport_min_timeslice_value,
 443                         .extra2         = (void*) &parport_max_timeslice_value
 444                 },
 445                 {
 446                         .procname       = "spintime",
 447                         .data           = &parport_default_spintime,
 448                         .maxlen         = sizeof(parport_default_spintime),
 449                         .mode           = 0644,
 450                         .proc_handler   = proc_dointvec_minmax,
 451                         .extra1         = (void*) &parport_min_spintime_value,
 452                         .extra2         = (void*) &parport_max_spintime_value
 453                 },
 454                 {}
 455         },
 456         {
 457                 {
 458                         .procname       = "default",
 459                         .mode           = 0555,
 460                         .child          = parport_default_sysctl_table.vars
 461                 },
 462                 {}
 463         },
 464         {
 465                 PARPORT_PARPORT_DIR(parport_default_sysctl_table.default_dir),
 466                 {}
 467         },
 468         {
 469                 PARPORT_DEV_DIR(parport_default_sysctl_table.parport_dir),
 470                 {}
 471         }
 472 };
 473
 474
 475 int parport_proc_register(struct parport *port)
 476 {
 477         struct parport_sysctl_table *t;
 478         int i;
 479
 480         t = kmemdup(&parport_sysctl_template, sizeof(*t), GFP_KERNEL);
 481         if (t == NULL)
 482                 return -ENOMEM;
 483
 484         t->device_dir[0].extra1 = port;
 485
 486         for (i = 0; i < 5; i++)
 487                 t->vars[i].extra1 = port;
 488
 489         t->vars[0].data = &port->spintime;
 490         t->vars[5].child = t->device_dir;
 491
 492         for (i = 0; i < 5; i++)
 493                 t->vars[6 + i].extra2 = &port->probe_info[i];
 494
 495         t->port_dir[0].procname = port->name;
 496
 497         t->port_dir[0].child = t->vars;
 498         t->parport_dir[0].child = t->port_dir;
 499         t->dev_dir[0].child = t->parport_dir;
 500
 501         t->sysctl_header = register_sysctl_table(t->dev_dir);
 502         if (t->sysctl_header == NULL) {
 503                 kfree(t);
 504                 t = NULL;
 505         }
 506         port->sysctl_table = t;
 507         return 0;
 508 }
 509
 510 int parport_proc_unregister(struct parport *port)
 511 {
 512         if (port->sysctl_table) {
 513                 struct parport_sysctl_table *t = port->sysctl_table;
 514                 port->sysctl_table = NULL;
 515                 unregister_sysctl_table(t->sysctl_header);
 516                 kfree(t);
 517         }
 518         return 0;
 519 }
 520
 521 int parport_device_proc_register(struct pardevice *device)
 522 {
 523         struct parport_device_sysctl_table *t;
 524         struct parport * port = device->port;
 525
 526         t = kmemdup(&parport_device_sysctl_template, sizeof(*t), GFP_KERNEL);
 527         if (t == NULL)
 528                 return -ENOMEM;
 529
 530         t->dev_dir[0].child = t->parport_dir;
 531         t->parport_dir[0].child = t->port_dir;
 532         t->port_dir[0].procname = port->name;
 533         t->port_dir[0].child = t->devices_root_dir;
 534         t->devices_root_dir[0].child = t->device_dir;
 535
 536         t->device_dir[0].procname = device->name;
 537         t->device_dir[0].child = t->vars;
 538         t->vars[0].data = &device->timeslice;
 539
 540         t->sysctl_header = register_sysctl_table(t->dev_dir);
 541         if (t->sysctl_header == NULL) {
 542                 kfree(t);
 543                 t = NULL;
 544         }
 545         device->sysctl_table = t;
 546         return 0;
 547 }
 548
 549 int parport_device_proc_unregister(struct pardevice *device)
 550 {
 551         if (device->sysctl_table) {
 552                 struct parport_device_sysctl_table *t = device->sysctl_table;
 553                 device->sysctl_table = NULL;
 554                 unregister_sysctl_table(t->sysctl_header);
 555                 kfree(t);
 556         }
 557         return 0;
 558 }
 559
 560 static int __init parport_default_proc_register(void)
 561 {
 562         int ret;
 563
 564         parport_default_sysctl_table.sysctl_header =
 565                 register_sysctl_table(parport_default_sysctl_table.dev_dir);
 566         if (!parport_default_sysctl_table.sysctl_header)
 567                 return -ENOMEM;
 568         ret = parport_bus_init();
 569         if (ret) {
 570                 unregister_sysctl_table(parport_default_sysctl_table.
 571                                         sysctl_header);
 572                 return ret;
 573         }
 574         return 0;
 575 }
 576
 577 static void __exit parport_default_proc_unregister(void)
 578 {
 579         if (parport_default_sysctl_table.sysctl_header) {
 580                 unregister_sysctl_table(parport_default_sysctl_table.
 581                                         sysctl_header);
 582                 parport_default_sysctl_table.sysctl_header = NULL;
 583         }
 584         parport_bus_exit();
 585 }
 586
 587 #else /* no sysctl or no procfs*/
 588
 589 int parport_proc_register(struct parport *pp)
 590 {
 591         return 0;
 592 }
 593
 594 int parport_proc_unregister(struct parport *pp)
 595 {
 596         return 0;
 597 }
 598
 599 int parport_device_proc_register(struct pardevice *device)
 600 {
 601         return 0;
 602 }
 603
 604 int parport_device_proc_unregister(struct pardevice *device)
 605 {
 606         return 0;
 607 }
 608
 609 static int __init parport_default_proc_register (void)
 610 {
 611         return parport_bus_init();
 612 }
 613
 614 static void __exit parport_default_proc_unregister (void)
 615 {
 616         parport_bus_exit();
 617 }
 618 #endif
 619
 620 subsys_initcall(parport_default_proc_register)
 621 module_exit(parport_default_proc_unregister)