drivers/parport/procfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Sysctl interface for parport devices.
   3  *
   4  * Authors: David Campbell
   5  *          Tim Waugh <tim@cyberelk.demon.co.uk>
   6  *          Philip Blundell <philb@gnu.org>
   7  *          Andrea Arcangeli
   8  *          Riccardo Facchetti <fizban@tin.it>
   9  *
  10  * based on work by Grant Guenther <grant@torque.net>
  11  *              and Philip Blundell
  12  *
  13  * Cleaned up include files - Russell King <linux@arm.uk.linux.org>
  14  */
  15
  16 #include <linux/string.h>
  17 #include <linux/init.h>
  18 #include <linux/module.h>
  19 #include <linux/errno.h>
  20 #include <linux/kernel.h>
  21 #include <linux/slab.h>
  22 #include <linux/parport.h>
  23 #include <linux/ctype.h>
  24 #include <linux/sysctl.h>
  25 #include <linux/device.h>
  26
  27 #include <linux/uaccess.h>
  28
  29 #if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS)
  30
  31 #define PARPORT_MIN_TIMESLICE_VALUE 1ul
  32 #define PARPORT_MAX_TIMESLICE_VALUE ((unsigned long) HZ)
  33 #define PARPORT_MIN_SPINTIME_VALUE 1
  34 #define PARPORT_MAX_SPINTIME_VALUE 1000
  35
  36 static int do_active_device(struct ctl_table *table, int write,
  37                       void *result, size_t *lenp, loff_t *ppos)
  38 {
  39         struct parport *port = (struct parport *)table->extra1;
  40         char buffer[256];
  41         struct pardevice *dev;
  42         int len = 0;
  43
  44         if (write)              /* can't happen anyway */
  45                 return -EACCES;
  46
  47         if (*ppos) {
  48                 *lenp = 0;
  49                 return 0;
  50         }
  51
  52         for (dev = port->devices; dev ; dev = dev->next) {
  53                 if(dev == port->cad) {
  54                         len += sprintf(buffer, "%s\n", dev->name);
  55                 }
  56         }
  57
  58         if(!len) {
  59                 len += sprintf(buffer, "%s\n", "none");
  60         }
  61
  62         if (len > *lenp)
  63                 len = *lenp;
  64         else
  65                 *lenp = len;
  66
  67         *ppos += len;
  68         memcpy(result, buffer, len);
  69         return 0;
  70 }
  71
  72 #ifdef CONFIG_PARPORT_1284
  73 static int do_autoprobe(struct ctl_table *table, int write,
  74                         void *result, size_t *lenp, loff_t *ppos)
  75 {
  76         struct parport_device_info *info = table->extra2;
  77         const char *str;
  78         char buffer[256];
  79         int len = 0;
  80
  81         if (write) /* permissions stop this */
  82                 return -EACCES;
  83
  84         if (*ppos) {
  85                 *lenp = 0;
  86                 return 0;
  87         }
  88
  89         if ((str = info->class_name) != NULL)
  90                 len += sprintf (buffer + len, "CLASS:%s;\n", str);
  91
  92         if ((str = info->model) != NULL)
  93                 len += sprintf (buffer + len, "MODEL:%s;\n", str);
  94
  95         if ((str = info->mfr) != NULL)
  96                 len += sprintf (buffer + len, "MANUFACTURER:%s;\n", str);
  97
  98         if ((str = info->description) != NULL)
  99                 len += sprintf (buffer + len, "DESCRIPTION:%s;\n", str);
 100
 101         if ((str = info->cmdset) != NULL)
 102                 len += sprintf (buffer + len, "COMMAND SET:%s;\n", str);
 103
 104         if (len > *lenp)
 105                 len = *lenp;
 106         else
 107                 *lenp = len;
 108
 109         *ppos += len;
 110
 111         memcpy(result, buffer, len);
 112         return 0;
 113 }
 114 #endif /* IEEE1284.3 support. */
 115
 116 static int do_hardware_base_addr(struct ctl_table *table, int write,
 117                                  void *result, size_t *lenp, loff_t *ppos)
 118 {
 119         struct parport *port = (struct parport *)table->extra1;
 120         char buffer[20];
 121         int len = 0;
 122
 123         if (*ppos) {
 124                 *lenp = 0;
 125                 return 0;
 126         }
 127
 128         if (write) /* permissions prevent this anyway */
 129                 return -EACCES;
 130
 131         len += sprintf (buffer, "%lu\t%lu\n", port->base, port->base_hi);
 132
 133         if (len > *lenp)
 134                 len = *lenp;
 135         else
 136                 *lenp = len;
 137
 138         *ppos += len;
 139         memcpy(result, buffer, len);
 140         return 0;
 141 }
 142
 143 static int do_hardware_irq(struct ctl_table *table, int write,
 144                            void *result, 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         memcpy(result, buffer, len);
 167         return 0;
 168 }
 169
 170 static int do_hardware_dma(struct ctl_table *table, int write,
 171                            void *result, 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         memcpy(result, buffer, len);
 194         return 0;
 195 }
 196
 197 static int do_hardware_modes(struct ctl_table *table, int write,
 198                              void *result, size_t *lenp, loff_t *ppos)
 199 {
 200         struct parport *port = (struct parport *)table->extra1;
 201         char buffer[40];
 202         int len = 0;
 203
 204         if (*ppos) {
 205                 *lenp = 0;
 206                 return 0;
 207         }
 208
 209         if (write) /* permissions prevent this anyway */
 210                 return -EACCES;
 211
 212         {
 213 #define printmode(x)                                                    \
 214 do {                                                                    \
 215         if (port->modes & PARPORT_MODE_##x)                             \
 216                 len += sprintf(buffer + len, "%s%s", f++ ? "," : "", #x); \
 217 } while (0)
 218                 int f = 0;
 219                 printmode(PCSPP);
 220                 printmode(TRISTATE);
 221                 printmode(COMPAT);
 222                 printmode(EPP);
 223                 printmode(ECP);
 224                 printmode(DMA);
 225 #undef printmode
 226         }
 227         buffer[len++] = '\n';
 228
 229         if (len > *lenp)
 230                 len = *lenp;
 231         else
 232                 *lenp = len;
 233
 234         *ppos += len;
 235         memcpy(result, buffer, len);
 236         return 0;
 237 }
 238
 239 static const unsigned long parport_min_timeslice_value =
 240 PARPORT_MIN_TIMESLICE_VALUE;
 241
 242 static const unsigned long parport_max_timeslice_value =
 243 PARPORT_MAX_TIMESLICE_VALUE;
 244
 245 static const  int parport_min_spintime_value =
 246 PARPORT_MIN_SPINTIME_VALUE;
 247
 248 static const int parport_max_spintime_value =
 249 PARPORT_MAX_SPINTIME_VALUE;
 250
 251
 252 struct parport_sysctl_table {
 253         struct ctl_table_header *port_header;
 254         struct ctl_table_header *devices_header;
 255 #ifdef CONFIG_PARPORT_1284
 256         struct ctl_table vars[10];
 257 #else
 258         struct ctl_table vars[5];
 259 #endif /* IEEE 1284 support */
 260         struct ctl_table device_dir[1];
 261 };
 262
 263 static const struct parport_sysctl_table parport_sysctl_template = {
 264         .port_header = NULL,
 265         .devices_header = NULL,
 266         {
 267                 {
 268                         .procname       = "spintime",
 269                         .data           = NULL,
 270                         .maxlen         = sizeof(int),
 271                         .mode           = 0644,
 272                         .proc_handler   = proc_dointvec_minmax,
 273                         .extra1         = (void*) &parport_min_spintime_value,
 274                         .extra2         = (void*) &parport_max_spintime_value
 275                 },
 276                 {
 277                         .procname       = "base-addr",
 278                         .data           = NULL,
 279                         .maxlen         = 0,
 280                         .mode           = 0444,
 281                         .proc_handler   = do_hardware_base_addr
 282                 },
 283                 {
 284                         .procname       = "irq",
 285                         .data           = NULL,
 286                         .maxlen         = 0,
 287                         .mode           = 0444,
 288                         .proc_handler   = do_hardware_irq
 289                 },
 290                 {
 291                         .procname       = "dma",
 292                         .data           = NULL,
 293                         .maxlen         = 0,
 294                         .mode           = 0444,
 295                         .proc_handler   = do_hardware_dma
 296                 },
 297                 {
 298                         .procname       = "modes",
 299                         .data           = NULL,
 300                         .maxlen         = 0,
 301                         .mode           = 0444,
 302                         .proc_handler   = do_hardware_modes
 303                 },
 304 #ifdef CONFIG_PARPORT_1284
 305                 {
 306                         .procname       = "autoprobe",
 307                         .data           = NULL,
 308                         .maxlen         = 0,
 309                         .mode           = 0444,
 310                         .proc_handler   = do_autoprobe
 311                 },
 312                 {
 313                         .procname       = "autoprobe0",
 314                         .data           = NULL,
 315                         .maxlen         = 0,
 316                         .mode           = 0444,
 317                         .proc_handler   = do_autoprobe
 318                 },
 319                 {
 320                         .procname       = "autoprobe1",
 321                         .data           = NULL,
 322                         .maxlen         = 0,
 323                         .mode           = 0444,
 324                         .proc_handler   = do_autoprobe
 325                 },
 326                 {
 327                         .procname       = "autoprobe2",
 328                         .data           = NULL,
 329                         .maxlen         = 0,
 330                         .mode           = 0444,
 331                         .proc_handler   = do_autoprobe
 332                 },
 333                 {
 334                         .procname       = "autoprobe3",
 335                         .data           = NULL,
 336                         .maxlen         = 0,
 337                         .mode           = 0444,
 338                         .proc_handler   = do_autoprobe
 339                 },
 340 #endif /* IEEE 1284 support */
 341         },
 342         {
 343                 {
 344                         .procname       = "active",
 345                         .data           = NULL,
 346                         .maxlen         = 0,
 347                         .mode           = 0444,
 348                         .proc_handler   = do_active_device
 349                 },
 350         },
 351 };
 352
 353 struct parport_device_sysctl_table
 354 {
 355         struct ctl_table_header *sysctl_header;
 356         struct ctl_table vars[1];
 357         struct ctl_table device_dir[1];
 358 };
 359
 360 static const struct parport_device_sysctl_table
 361 parport_device_sysctl_template = {
 362         .sysctl_header = NULL,
 363         {
 364                 {
 365                         .procname       = "timeslice",
 366                         .data           = NULL,
 367                         .maxlen         = sizeof(unsigned long),
 368                         .mode           = 0644,
 369                         .proc_handler   = proc_doulongvec_ms_jiffies_minmax,
 370                         .extra1         = (void*) &parport_min_timeslice_value,
 371                         .extra2         = (void*) &parport_max_timeslice_value
 372                 },
 373         },
 374         {
 375                 {
 376                         .procname       = NULL,
 377                         .data           = NULL,
 378                         .maxlen         = 0,
 379                         .mode           = 0555,
 380                 },
 381         }
 382 };
 383
 384 struct parport_default_sysctl_table
 385 {
 386         struct ctl_table_header *sysctl_header;
 387         struct ctl_table vars[2];
 388 };
 389
 390 static struct parport_default_sysctl_table
 391 parport_default_sysctl_table = {
 392         .sysctl_header  = NULL,
 393         {
 394                 {
 395                         .procname       = "timeslice",
 396                         .data           = &parport_default_timeslice,
 397                         .maxlen         = sizeof(parport_default_timeslice),
 398                         .mode           = 0644,
 399                         .proc_handler   = proc_doulongvec_ms_jiffies_minmax,
 400                         .extra1         = (void*) &parport_min_timeslice_value,
 401                         .extra2         = (void*) &parport_max_timeslice_value
 402                 },
 403                 {
 404                         .procname       = "spintime",
 405                         .data           = &parport_default_spintime,
 406                         .maxlen         = sizeof(parport_default_spintime),
 407                         .mode           = 0644,
 408                         .proc_handler   = proc_dointvec_minmax,
 409                         .extra1         = (void*) &parport_min_spintime_value,
 410                         .extra2         = (void*) &parport_max_spintime_value
 411                 },
 412         }
 413 };
 414
 415 int parport_proc_register(struct parport *port)
 416 {
 417         struct parport_sysctl_table *t;
 418         char *tmp_dir_path;
 419         int i, err = 0;
 420
 421         t = kmemdup(&parport_sysctl_template, sizeof(*t), GFP_KERNEL);
 422         if (t == NULL)
 423                 return -ENOMEM;
 424
 425         t->device_dir[0].extra1 = port;
 426
 427         t->vars[0].data = &port->spintime;
 428         for (i = 0; i < 5; i++) {
 429                 t->vars[i].extra1 = port;
 430 #ifdef CONFIG_PARPORT_1284
 431                 t->vars[5 + i].extra2 = &port->probe_info[i];
 432 #endif /* IEEE 1284 support */
 433         }
 434
 435         tmp_dir_path = kasprintf(GFP_KERNEL, "dev/parport/%s/devices", port->name);
 436         if (!tmp_dir_path) {
 437                 err = -ENOMEM;
 438                 goto exit_free_t;
 439         }
 440
 441         t->devices_header = register_sysctl(tmp_dir_path, t->device_dir);
 442         if (t->devices_header == NULL) {
 443                 err = -ENOENT;
 444                 goto  exit_free_tmp_dir_path;
 445         }
 446
 447         kfree(tmp_dir_path);
 448
 449         tmp_dir_path = kasprintf(GFP_KERNEL, "dev/parport/%s", port->name);
 450         if (!tmp_dir_path) {
 451                 err = -ENOMEM;
 452                 goto unregister_devices_h;
 453         }
 454
 455         t->port_header = register_sysctl(tmp_dir_path, t->vars);
 456         if (t->port_header == NULL) {
 457                 err = -ENOENT;
 458                 goto unregister_devices_h;
 459         }
 460
 461         port->sysctl_table = t;
 462
 463         kfree(tmp_dir_path);
 464         return 0;
 465
 466 unregister_devices_h:
 467         unregister_sysctl_table(t->devices_header);
 468
 469 exit_free_tmp_dir_path:
 470         kfree(tmp_dir_path);
 471
 472 exit_free_t:
 473         kfree(t);
 474         return err;
 475 }
 476
 477 int parport_proc_unregister(struct parport *port)
 478 {
 479         if (port->sysctl_table) {
 480                 struct parport_sysctl_table *t = port->sysctl_table;
 481                 port->sysctl_table = NULL;
 482                 unregister_sysctl_table(t->devices_header);
 483                 unregister_sysctl_table(t->port_header);
 484                 kfree(t);
 485         }
 486         return 0;
 487 }
 488
 489 int parport_device_proc_register(struct pardevice *device)
 490 {
 491         struct parport_device_sysctl_table *t;
 492         struct parport * port = device->port;
 493         char *tmp_dir_path;
 494         int err = 0;
 495
 496         t = kmemdup(&parport_device_sysctl_template, sizeof(*t), GFP_KERNEL);
 497         if (t == NULL)
 498                 return -ENOMEM;
 499
 500         /* Allocate a buffer for two paths: dev/parport/PORT/devices/DEVICE. */
 501         tmp_dir_path = kasprintf(GFP_KERNEL, "dev/parport/%s/devices/%s", port->name, device->name);
 502         if (!tmp_dir_path) {
 503                 err = -ENOMEM;
 504                 goto exit_free_t;
 505         }
 506
 507         t->vars[0].data = &device->timeslice;
 508
 509         t->sysctl_header = register_sysctl(tmp_dir_path, t->vars);
 510         if (t->sysctl_header == NULL) {
 511                 kfree(t);
 512                 t = NULL;
 513         }
 514         device->sysctl_table = t;
 515
 516         kfree(tmp_dir_path);
 517         return 0;
 518
 519 exit_free_t:
 520         kfree(t);
 521
 522         return err;
 523 }
 524
 525 int parport_device_proc_unregister(struct pardevice *device)
 526 {
 527         if (device->sysctl_table) {
 528                 struct parport_device_sysctl_table *t = device->sysctl_table;
 529                 device->sysctl_table = NULL;
 530                 unregister_sysctl_table(t->sysctl_header);
 531                 kfree(t);
 532         }
 533         return 0;
 534 }
 535
 536 static int __init parport_default_proc_register(void)
 537 {
 538         int ret;
 539
 540         parport_default_sysctl_table.sysctl_header =
 541                 register_sysctl("dev/parport/default", parport_default_sysctl_table.vars);
 542         if (!parport_default_sysctl_table.sysctl_header)
 543                 return -ENOMEM;
 544         ret = parport_bus_init();
 545         if (ret) {
 546                 unregister_sysctl_table(parport_default_sysctl_table.
 547                                         sysctl_header);
 548                 return ret;
 549         }
 550         return 0;
 551 }
 552
 553 static void __exit parport_default_proc_unregister(void)
 554 {
 555         if (parport_default_sysctl_table.sysctl_header) {
 556                 unregister_sysctl_table(parport_default_sysctl_table.
 557                                         sysctl_header);
 558                 parport_default_sysctl_table.sysctl_header = NULL;
 559         }
 560         parport_bus_exit();
 561 }
 562
 563 #else /* no sysctl or no procfs*/
 564
 565 int parport_proc_register(struct parport *pp)
 566 {
 567         return 0;
 568 }
 569
 570 int parport_proc_unregister(struct parport *pp)
 571 {
 572         return 0;
 573 }
 574
 575 int parport_device_proc_register(struct pardevice *device)
 576 {
 577         return 0;
 578 }
 579
 580 int parport_device_proc_unregister(struct pardevice *device)
 581 {
 582         return 0;
 583 }
 584
 585 static int __init parport_default_proc_register (void)
 586 {
 587         return parport_bus_init();
 588 }
 589
 590 static void __exit parport_default_proc_unregister (void)
 591 {
 592         parport_bus_exit();
 593 }
 594 #endif
 595
 596 subsys_initcall(parport_default_proc_register)
 597 module_exit(parport_default_proc_unregister)