drivers/parport/procfs.c

   1 /* Sysctl interface for parport devices.
   2  *
   3  * Authors: David Campbell <campbell@torque.net>
   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/config.h>
  17 #include <linux/errno.h>
  18 #include <linux/kernel.h>
  19 #include <linux/slab.h>
  20 #include <linux/parport.h>
  21 #include <linux/ctype.h>
  22 #include <linux/sysctl.h>
  23
  24 #include <asm/uaccess.h>
  25
  26 #if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS)
  27
  28 #define PARPORT_MIN_TIMESLICE_VALUE 1ul
  29 #define PARPORT_MAX_TIMESLICE_VALUE ((unsigned long) HZ)
  30 #define PARPORT_MIN_SPINTIME_VALUE 1
  31 #define PARPORT_MAX_SPINTIME_VALUE 1000
  32
  33 static int do_active_device(ctl_table *table, int write, struct file *filp,
  34                       void *result, size_t *lenp)
  35 {
  36         struct parport *port = (struct parport *)table->extra1;
  37         char buffer[256];
  38         struct pardevice *dev;
  39         int len = 0;
  40
  41         if (write)              /* can't happen anyway */
  42                 return -EACCES;
  43
  44         if (filp->f_pos) {
  45                 *lenp = 0;
  46                 return 0;
  47         }
  48
  49         for (dev = port->devices; dev ; dev = dev->next) {
  50                 if(dev == port->cad) {
  51                         len += sprintf(buffer, "%s\n", dev->name);
  52                 }
  53         }
  54
  55         if(!len) {
  56                 len += sprintf(buffer, "%s\n", "none");
  57         }
  58
  59         if (len > *lenp)
  60                 len = *lenp;
  61         else
  62                 *lenp = len;
  63
  64         filp->f_pos += len;
  65
  66         return copy_to_user(result, buffer, len) ? -EFAULT : 0;
  67 }
  68
  69 #ifdef CONFIG_PARPORT_1284
  70 static int do_autoprobe(ctl_table *table, int write, struct file *filp,
  71                         void *result, size_t *lenp)
  72 {
  73         struct parport_device_info *info = table->extra2;
  74         const char *str;
  75         char buffer[256];
  76         int len = 0;
  77
  78         if (write) /* permissions stop this */
  79                 return -EACCES;
  80
  81         if (filp->f_pos) {
  82                 *lenp = 0;
  83                 return 0;
  84         }
  85
  86         if ((str = info->class_name) != NULL)
  87                 len += sprintf (buffer + len, "CLASS:%s;\n", str);
  88
  89         if ((str = info->model) != NULL)
  90                 len += sprintf (buffer + len, "MODEL:%s;\n", str);
  91
  92         if ((str = info->mfr) != NULL)
  93                 len += sprintf (buffer + len, "MANUFACTURER:%s;\n", str);
  94
  95         if ((str = info->description) != NULL)
  96                 len += sprintf (buffer + len, "DESCRIPTION:%s;\n", str);
  97
  98         if ((str = info->cmdset) != NULL)
  99                 len += sprintf (buffer + len, "COMMAND SET:%s;\n", str);
 100
 101         if (len > *lenp)
 102                 len = *lenp;
 103         else
 104                 *lenp = len;
 105
 106         filp->f_pos += len;
 107
 108         return copy_to_user (result, buffer, len) ? -EFAULT : 0;
 109 }
 110 #endif /* IEEE1284.3 support. */
 111
 112 static int do_hardware_base_addr (ctl_table *table, int write,
 113                                   struct file *filp, void *result,
 114                                   size_t *lenp)
 115 {
 116         struct parport *port = (struct parport *)table->extra1;
 117         char buffer[20];
 118         int len = 0;
 119
 120         if (filp->f_pos) {
 121                 *lenp = 0;
 122                 return 0;
 123         }
 124
 125         if (write) /* permissions prevent this anyway */
 126                 return -EACCES;
 127
 128         len += sprintf (buffer, "%lu\t%lu\n", port->base, port->base_hi);
 129
 130         if (len > *lenp)
 131                 len = *lenp;
 132         else
 133                 *lenp = len;
 134
 135         filp->f_pos += len;
 136
 137         return copy_to_user(result, buffer, len) ? -EFAULT : 0;
 138 }
 139
 140 static int do_hardware_irq (ctl_table *table, int write,
 141                             struct file *filp, void *result,
 142                             size_t *lenp)
 143 {
 144         struct parport *port = (struct parport *)table->extra1;
 145         char buffer[20];
 146         int len = 0;
 147
 148         if (filp->f_pos) {
 149                 *lenp = 0;
 150                 return 0;
 151         }
 152
 153         if (write) /* permissions prevent this anyway */
 154                 return -EACCES;
 155
 156         len += sprintf (buffer, "%d\n", port->irq);
 157
 158         if (len > *lenp)
 159                 len = *lenp;
 160         else
 161                 *lenp = len;
 162
 163         filp->f_pos += len;
 164
 165         return copy_to_user(result, buffer, len) ? -EFAULT : 0;
 166 }
 167
 168 static int do_hardware_dma (ctl_table *table, int write,
 169                             struct file *filp, void *result,
 170                             size_t *lenp)
 171 {
 172         struct parport *port = (struct parport *)table->extra1;
 173         char buffer[20];
 174         int len = 0;
 175
 176         if (filp->f_pos) {
 177                 *lenp = 0;
 178                 return 0;
 179         }
 180
 181         if (write) /* permissions prevent this anyway */
 182                 return -EACCES;
 183
 184         len += sprintf (buffer, "%d\n", port->dma);
 185
 186         if (len > *lenp)
 187                 len = *lenp;
 188         else
 189                 *lenp = len;
 190
 191         filp->f_pos += len;
 192
 193         return copy_to_user(result, buffer, len) ? -EFAULT : 0;
 194 }
 195
 196 static int do_hardware_modes (ctl_table *table, int write,
 197                               struct file *filp, void *result,
 198                               size_t *lenp)
 199 {
 200         struct parport *port = (struct parport *)table->extra1;
 201         char buffer[40];
 202         int len = 0;
 203
 204         if (filp->f_pos) {
 205                 *lenp = 0;
 206                 return 0;
 207         }
 208
 209         if (write) /* permissions prevent this anyway */
 210                 return -EACCES;
 211
 212         {
 213 #define printmode(x) {if(port->modes&PARPORT_MODE_##x){len+=sprintf(buffer+len,"%s%s",f?",":"",#x);f++;}}
 214                 int f = 0;
 215                 printmode(PCSPP);
 216                 printmode(TRISTATE);
 217                 printmode(COMPAT);
 218                 printmode(EPP);
 219                 printmode(ECP);
 220                 printmode(DMA);
 221 #undef printmode
 222         }
 223         buffer[len++] = '\n';
 224
 225         if (len > *lenp)
 226                 len = *lenp;
 227         else
 228                 *lenp = len;
 229
 230         filp->f_pos += len;
 231
 232         return copy_to_user(result, buffer, len) ? -EFAULT : 0;
 233 }
 234
 235 #define PARPORT_PORT_DIR(child) { 0, NULL, NULL, 0, 0555, child }
 236 #define PARPORT_PARPORT_DIR(child) { DEV_PARPORT, "parport", \
 237                                      NULL, 0, 0555, child }
 238 #define PARPORT_DEV_DIR(child) { CTL_DEV, "dev", NULL, 0, 0555, child }
 239 #define PARPORT_DEVICES_ROOT_DIR  { DEV_PARPORT_DEVICES, "devices", \
 240                                     NULL, 0, 0555, NULL }
 241
 242 static const unsigned long parport_min_timeslice_value =
 243 PARPORT_MIN_TIMESLICE_VALUE;
 244
 245 static const unsigned long parport_max_timeslice_value =
 246 PARPORT_MAX_TIMESLICE_VALUE;
 247
 248 static const  int parport_min_spintime_value =
 249 PARPORT_MIN_SPINTIME_VALUE;
 250
 251 static const int parport_max_spintime_value =
 252 PARPORT_MAX_SPINTIME_VALUE;
 253
 254
 255 struct parport_sysctl_table {
 256         struct ctl_table_header *sysctl_header;
 257         ctl_table vars[12];
 258         ctl_table device_dir[2];
 259         ctl_table port_dir[2];
 260         ctl_table parport_dir[2];
 261         ctl_table dev_dir[2];
 262 };
 263
 264 static const struct parport_sysctl_table parport_sysctl_template = {
 265         NULL,
 266         {
 267                 { DEV_PARPORT_SPINTIME, "spintime",
 268                   NULL, sizeof(int), 0644, NULL,
 269                   &proc_dointvec_minmax, NULL, NULL,
 270                   (void*) &parport_min_spintime_value,
 271                   (void*) &parport_max_spintime_value },
 272                 { DEV_PARPORT_BASE_ADDR, "base-addr",
 273                   NULL, 0, 0444, NULL,
 274                   &do_hardware_base_addr },
 275                 { DEV_PARPORT_IRQ, "irq",
 276                   NULL, 0, 0444, NULL,
 277                   &do_hardware_irq },
 278                 { DEV_PARPORT_DMA, "dma",
 279                   NULL, 0, 0444, NULL,
 280                   &do_hardware_dma },
 281                 { DEV_PARPORT_MODES, "modes",
 282                   NULL, 0, 0444, NULL,
 283                   &do_hardware_modes },
 284                 PARPORT_DEVICES_ROOT_DIR,
 285 #ifdef CONFIG_PARPORT_1284
 286                 { DEV_PARPORT_AUTOPROBE, "autoprobe",
 287                   NULL, 0, 0444, NULL,
 288                   &do_autoprobe },
 289                 { DEV_PARPORT_AUTOPROBE + 1, "autoprobe0",
 290                  NULL, 0, 0444, NULL,
 291                  &do_autoprobe },
 292                 { DEV_PARPORT_AUTOPROBE + 2, "autoprobe1",
 293                   NULL, 0, 0444, NULL,
 294                   &do_autoprobe },
 295                 { DEV_PARPORT_AUTOPROBE + 3, "autoprobe2",
 296                   NULL, 0, 0444, NULL,
 297                   &do_autoprobe },
 298                 { DEV_PARPORT_AUTOPROBE + 4, "autoprobe3",
 299                   NULL, 0, 0444, NULL,
 300                   &do_autoprobe },
 301 #endif /* IEEE 1284 support */
 302                 {0}
 303         },
 304         { {DEV_PARPORT_DEVICES_ACTIVE, "active", NULL, 0, 0444, NULL,
 305           &do_active_device }, {0}},
 306         { PARPORT_PORT_DIR(NULL), {0}},
 307         { PARPORT_PARPORT_DIR(NULL), {0}},
 308         { PARPORT_DEV_DIR(NULL), {0}}
 309 };
 310
 311 struct parport_device_sysctl_table
 312 {
 313         struct ctl_table_header *sysctl_header;
 314         ctl_table vars[2];
 315         ctl_table device_dir[2];
 316         ctl_table devices_root_dir[2];
 317         ctl_table port_dir[2];
 318         ctl_table parport_dir[2];
 319         ctl_table dev_dir[2];
 320 };
 321
 322 static const struct parport_device_sysctl_table
 323 parport_device_sysctl_template = {
 324         NULL,
 325         {
 326                 { DEV_PARPORT_DEVICE_TIMESLICE, "timeslice",
 327                   NULL, sizeof(int), 0644, NULL,
 328                   &proc_doulongvec_ms_jiffies_minmax, NULL, NULL,
 329                   (void*) &parport_min_timeslice_value,
 330                   (void*) &parport_max_timeslice_value },
 331         },
 332         { {0, NULL, NULL, 0, 0555, NULL}, {0}},
 333         { PARPORT_DEVICES_ROOT_DIR, {0}},
 334         { PARPORT_PORT_DIR(NULL), {0}},
 335         { PARPORT_PARPORT_DIR(NULL), {0}},
 336         { PARPORT_DEV_DIR(NULL), {0}}
 337 };
 338
 339 struct parport_default_sysctl_table
 340 {
 341         struct ctl_table_header *sysctl_header;
 342         ctl_table vars[3];
 343         ctl_table default_dir[2];
 344         ctl_table parport_dir[2];
 345         ctl_table dev_dir[2];
 346 };
 347
 348 extern unsigned long parport_default_timeslice;
 349 extern int parport_default_spintime;
 350
 351 static struct parport_default_sysctl_table
 352 parport_default_sysctl_table = {
 353         NULL,
 354         {
 355                 { DEV_PARPORT_DEFAULT_TIMESLICE, "timeslice",
 356                   &parport_default_timeslice,
 357                   sizeof(parport_default_timeslice), 0644, NULL,
 358                   &proc_doulongvec_ms_jiffies_minmax, NULL, NULL,
 359                   (void*) &parport_min_timeslice_value,
 360                   (void*) &parport_max_timeslice_value },
 361                 { DEV_PARPORT_DEFAULT_SPINTIME, "spintime",
 362                   &parport_default_spintime,
 363                   sizeof(parport_default_spintime), 0644, NULL,
 364                   &proc_dointvec_minmax, NULL, NULL,
 365                   (void*) &parport_min_spintime_value,
 366                   (void*) &parport_max_spintime_value },
 367                 {0}
 368         },
 369         { { DEV_PARPORT_DEFAULT, "default", NULL, 0, 0555,
 370             parport_default_sysctl_table.vars },{0}},
 371         {
 372         PARPORT_PARPORT_DIR(parport_default_sysctl_table.default_dir),
 373         {0}},
 374         { PARPORT_DEV_DIR(parport_default_sysctl_table.parport_dir), {0}}
 375 };
 376
 377
 378 int parport_proc_register(struct parport *port)
 379 {
 380         struct parport_sysctl_table *t;
 381         int i;
 382
 383         t = kmalloc(sizeof(*t), GFP_KERNEL);
 384         if (t == NULL)
 385                 return -ENOMEM;
 386         memcpy(t, &parport_sysctl_template, sizeof(*t));
 387
 388         t->device_dir[0].extra1 = port;
 389
 390         for (i = 0; i < 8; i++)
 391                 t->vars[i].extra1 = port;
 392
 393         t->vars[0].data = &port->spintime;
 394         t->vars[5].child = t->device_dir;
 395
 396         for (i = 0; i < 5; i++)
 397                 t->vars[6 + i].extra2 = &port->probe_info[i];
 398
 399         t->port_dir[0].procname = port->name;
 400         t->port_dir[0].ctl_name = port->number + 1; /* nb 0 isn't legal here */
 401
 402         t->port_dir[0].child = t->vars;
 403         t->parport_dir[0].child = t->port_dir;
 404         t->dev_dir[0].child = t->parport_dir;
 405
 406         t->sysctl_header = register_sysctl_table(t->dev_dir, 0);
 407         if (t->sysctl_header == NULL) {
 408                 kfree(t);
 409                 t = NULL;
 410         }
 411         port->sysctl_table = t;
 412         return 0;
 413 }
 414
 415 int parport_proc_unregister(struct parport *port)
 416 {
 417         if (port->sysctl_table) {
 418                 struct parport_sysctl_table *t = port->sysctl_table;
 419                 port->sysctl_table = NULL;
 420                 unregister_sysctl_table(t->sysctl_header);
 421                 kfree(t);
 422         }
 423         return 0;
 424 }
 425
 426 int parport_device_proc_register(struct pardevice *device)
 427 {
 428         struct parport_device_sysctl_table *t;
 429         struct parport * port = device->port;
 430
 431         t = kmalloc(sizeof(*t), GFP_KERNEL);
 432         if (t == NULL)
 433                 return -ENOMEM;
 434         memcpy(t, &parport_device_sysctl_template, sizeof(*t));
 435
 436         t->dev_dir[0].child = t->parport_dir;
 437         t->parport_dir[0].child = t->port_dir;
 438         t->port_dir[0].procname = port->name;
 439         t->port_dir[0].ctl_name = port->number + 1; /* nb 0 isn't legal here */
 440         t->port_dir[0].child = t->devices_root_dir;
 441         t->devices_root_dir[0].child = t->device_dir;
 442
 443 #ifdef CONFIG_PARPORT_1284
 444
 445         t->device_dir[0].ctl_name =
 446                 parport_device_num(port->number, port->muxport,
 447                                    device->daisy)
 448                 + 1;  /* nb 0 isn't legal here */
 449
 450 #else /* No IEEE 1284 support */
 451
 452         /* parport_device_num isn't available. */
 453         t->device_dir[0].ctl_name = 1;
 454
 455 #endif /* IEEE 1284 support or not */
 456
 457         t->device_dir[0].procname = device->name;
 458         t->device_dir[0].extra1 = device;
 459         t->device_dir[0].child = t->vars;
 460         t->vars[0].data = &device->timeslice;
 461
 462         t->sysctl_header = register_sysctl_table(t->dev_dir, 0);
 463         if (t->sysctl_header == NULL) {
 464                 kfree(t);
 465                 t = NULL;
 466         }
 467         device->sysctl_table = t;
 468         return 0;
 469 }
 470
 471 int parport_device_proc_unregister(struct pardevice *device)
 472 {
 473         if (device->sysctl_table) {
 474                 struct parport_device_sysctl_table *t = device->sysctl_table;
 475                 device->sysctl_table = NULL;
 476                 unregister_sysctl_table(t->sysctl_header);
 477                 kfree(t);
 478         }
 479         return 0;
 480 }
 481
 482 int parport_default_proc_register(void)
 483 {
 484         parport_default_sysctl_table.sysctl_header =
 485                 register_sysctl_table(parport_default_sysctl_table.dev_dir, 0);
 486         return 0;
 487 }
 488
 489 int parport_default_proc_unregister(void)
 490 {
 491         if (parport_default_sysctl_table.sysctl_header) {
 492                 unregister_sysctl_table(parport_default_sysctl_table.
 493                                         sysctl_header);
 494                 parport_default_sysctl_table.sysctl_header = NULL;
 495         }
 496         return 0;
 497 }
 498
 499 #else /* no sysctl or no procfs*/
 500
 501 int parport_proc_register(struct parport *pp)
 502 {
 503         return 0;
 504 }
 505
 506 int parport_proc_unregister(struct parport *pp)
 507 {
 508         return 0;
 509 }
 510
 511 int parport_device_proc_register(struct pardevice *device)
 512 {
 513         return 0;
 514 }
 515
 516 int parport_device_proc_unregister(struct pardevice *device)
 517 {
 518         return 0;
 519 }
 520
 521 int parport_default_proc_register (void)
 522 {
 523         return 0;
 524 }
 525
 526 int parport_default_proc_unregister (void)
 527 {
 528         return 0;
 529 }
 530 #endif