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