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) { 0, NULL, NULL, 0, 0555, child }
 237 #define PARPORT_PARPORT_DIR(child) { DEV_PARPORT, "parport", \
 238                                      NULL, 0, 0555, child }
 239 #define PARPORT_DEV_DIR(child) { CTL_DEV, "dev", NULL, 0, 0555, child }
 240 #define PARPORT_DEVICES_ROOT_DIR  { DEV_PARPORT_DEVICES, "devices", \
 241                                     NULL, 0, 0555, 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         NULL,
 267         {
 268                 { DEV_PARPORT_SPINTIME, "spintime",
 269                   NULL, sizeof(int), 0644, NULL,
 270                   &proc_dointvec_minmax, NULL, NULL,
 271                   (void*) &parport_min_spintime_value,
 272                   (void*) &parport_max_spintime_value },
 273                 { DEV_PARPORT_BASE_ADDR, "base-addr",
 274                   NULL, 0, 0444, NULL,
 275                   &do_hardware_base_addr },
 276                 { DEV_PARPORT_IRQ, "irq",
 277                   NULL, 0, 0444, NULL,
 278                   &do_hardware_irq },
 279                 { DEV_PARPORT_DMA, "dma",
 280                   NULL, 0, 0444, NULL,
 281                   &do_hardware_dma },
 282                 { DEV_PARPORT_MODES, "modes",
 283                   NULL, 0, 0444, NULL,
 284                   &do_hardware_modes },
 285                 PARPORT_DEVICES_ROOT_DIR,
 286 #ifdef CONFIG_PARPORT_1284
 287                 { DEV_PARPORT_AUTOPROBE, "autoprobe",
 288                   NULL, 0, 0444, NULL,
 289                   &do_autoprobe },
 290                 { DEV_PARPORT_AUTOPROBE + 1, "autoprobe0",
 291                  NULL, 0, 0444, NULL,
 292                  &do_autoprobe },
 293                 { DEV_PARPORT_AUTOPROBE + 2, "autoprobe1",
 294                   NULL, 0, 0444, NULL,
 295                   &do_autoprobe },
 296                 { DEV_PARPORT_AUTOPROBE + 3, "autoprobe2",
 297                   NULL, 0, 0444, NULL,
 298                   &do_autoprobe },
 299                 { DEV_PARPORT_AUTOPROBE + 4, "autoprobe3",
 300                   NULL, 0, 0444, NULL,
 301                   &do_autoprobe },
 302 #endif /* IEEE 1284 support */
 303                 {0}
 304         },
 305         { {DEV_PARPORT_DEVICES_ACTIVE, "active", NULL, 0, 0444, NULL,
 306           &do_active_device }, {0}},
 307         { PARPORT_PORT_DIR(NULL), {0}},
 308         { PARPORT_PARPORT_DIR(NULL), {0}},
 309         { PARPORT_DEV_DIR(NULL), {0}}
 310 };
 311
 312 struct parport_device_sysctl_table
 313 {
 314         struct ctl_table_header *sysctl_header;
 315         ctl_table vars[2];
 316         ctl_table device_dir[2];
 317         ctl_table devices_root_dir[2];
 318         ctl_table port_dir[2];
 319         ctl_table parport_dir[2];
 320         ctl_table dev_dir[2];
 321 };
 322
 323 static const struct parport_device_sysctl_table
 324 parport_device_sysctl_template = {
 325         NULL,
 326         {
 327                 { DEV_PARPORT_DEVICE_TIMESLICE, "timeslice",
 328                   NULL, sizeof(int), 0644, NULL,
 329                   &proc_doulongvec_ms_jiffies_minmax, NULL, NULL,
 330                   (void*) &parport_min_timeslice_value,
 331                   (void*) &parport_max_timeslice_value },
 332         },
 333         { {0, NULL, NULL, 0, 0555, NULL}, {0}},
 334         { PARPORT_DEVICES_ROOT_DIR, {0}},
 335         { PARPORT_PORT_DIR(NULL), {0}},
 336         { PARPORT_PARPORT_DIR(NULL), {0}},
 337         { PARPORT_DEV_DIR(NULL), {0}}
 338 };
 339
 340 struct parport_default_sysctl_table
 341 {
 342         struct ctl_table_header *sysctl_header;
 343         ctl_table vars[3];
 344         ctl_table default_dir[2];
 345         ctl_table parport_dir[2];
 346         ctl_table dev_dir[2];
 347 };
 348
 349 extern unsigned long parport_default_timeslice;
 350 extern int parport_default_spintime;
 351
 352 static struct parport_default_sysctl_table
 353 parport_default_sysctl_table = {
 354         NULL,
 355         {
 356                 { DEV_PARPORT_DEFAULT_TIMESLICE, "timeslice",
 357                   &parport_default_timeslice,
 358                   sizeof(parport_default_timeslice), 0644, NULL,
 359                   &proc_doulongvec_ms_jiffies_minmax, NULL, NULL,
 360                   (void*) &parport_min_timeslice_value,
 361                   (void*) &parport_max_timeslice_value },
 362                 { DEV_PARPORT_DEFAULT_SPINTIME, "spintime",
 363                   &parport_default_spintime,
 364                   sizeof(parport_default_spintime), 0644, NULL,
 365                   &proc_dointvec_minmax, NULL, NULL,
 366                   (void*) &parport_min_spintime_value,
 367                   (void*) &parport_max_spintime_value },
 368                 {0}
 369         },
 370         { { DEV_PARPORT_DEFAULT, "default", NULL, 0, 0555,
 371             parport_default_sysctl_table.vars },{0}},
 372         {
 373         PARPORT_PARPORT_DIR(parport_default_sysctl_table.default_dir),
 374         {0}},
 375         { PARPORT_DEV_DIR(parport_default_sysctl_table.parport_dir), {0}}
 376 };
 377
 378
 379 int parport_proc_register(struct parport *port)
 380 {
 381         struct parport_sysctl_table *t;
 382         int i;
 383
 384         t = kmalloc(sizeof(*t), GFP_KERNEL);
 385         if (t == NULL)
 386                 return -ENOMEM;
 387         memcpy(t, &parport_sysctl_template, sizeof(*t));
 388
 389         t->device_dir[0].extra1 = port;
 390
 391         for (i = 0; i < 8; i++)
 392                 t->vars[i].extra1 = port;
 393
 394         t->vars[0].data = &port->spintime;
 395         t->vars[5].child = t->device_dir;
 396
 397         for (i = 0; i < 5; i++)
 398                 t->vars[6 + i].extra2 = &port->probe_info[i];
 399
 400         t->port_dir[0].procname = port->name;
 401         t->port_dir[0].ctl_name = port->number + 1; /* nb 0 isn't legal here */
 402
 403         t->port_dir[0].child = t->vars;
 404         t->parport_dir[0].child = t->port_dir;
 405         t->dev_dir[0].child = t->parport_dir;
 406
 407         t->sysctl_header = register_sysctl_table(t->dev_dir, 0);
 408         if (t->sysctl_header == NULL) {
 409                 kfree(t);
 410                 t = NULL;
 411         }
 412         port->sysctl_table = t;
 413         return 0;
 414 }
 415
 416 int parport_proc_unregister(struct parport *port)
 417 {
 418         if (port->sysctl_table) {
 419                 struct parport_sysctl_table *t = port->sysctl_table;
 420                 port->sysctl_table = NULL;
 421                 unregister_sysctl_table(t->sysctl_header);
 422                 kfree(t);
 423         }
 424         return 0;
 425 }
 426
 427 int parport_device_proc_register(struct pardevice *device)
 428 {
 429         struct parport_device_sysctl_table *t;
 430         struct parport * port = device->port;
 431
 432         t = kmalloc(sizeof(*t), GFP_KERNEL);
 433         if (t == NULL)
 434                 return -ENOMEM;
 435         memcpy(t, &parport_device_sysctl_template, sizeof(*t));
 436
 437         t->dev_dir[0].child = t->parport_dir;
 438         t->parport_dir[0].child = t->port_dir;
 439         t->port_dir[0].procname = port->name;
 440         t->port_dir[0].ctl_name = port->number + 1; /* nb 0 isn't legal here */
 441         t->port_dir[0].child = t->devices_root_dir;
 442         t->devices_root_dir[0].child = t->device_dir;
 443
 444 #ifdef CONFIG_PARPORT_1284
 445
 446         t->device_dir[0].ctl_name =
 447                 parport_device_num(port->number, port->muxport,
 448                                    device->daisy)
 449                 + 1;  /* nb 0 isn't legal here */
 450
 451 #else /* No IEEE 1284 support */
 452
 453         /* parport_device_num isn't available. */
 454         t->device_dir[0].ctl_name = 1;
 455
 456 #endif /* IEEE 1284 support or not */
 457
 458         t->device_dir[0].procname = device->name;
 459         t->device_dir[0].extra1 = device;
 460         t->device_dir[0].child = t->vars;
 461         t->vars[0].data = &device->timeslice;
 462
 463         t->sysctl_header = register_sysctl_table(t->dev_dir, 0);
 464         if (t->sysctl_header == NULL) {
 465                 kfree(t);
 466                 t = NULL;
 467         }
 468         device->sysctl_table = t;
 469         return 0;
 470 }
 471
 472 int parport_device_proc_unregister(struct pardevice *device)
 473 {
 474         if (device->sysctl_table) {
 475                 struct parport_device_sysctl_table *t = device->sysctl_table;
 476                 device->sysctl_table = NULL;
 477                 unregister_sysctl_table(t->sysctl_header);
 478                 kfree(t);
 479         }
 480         return 0;
 481 }
 482
 483 static int __init parport_default_proc_register(void)
 484 {
 485         parport_default_sysctl_table.sysctl_header =
 486                 register_sysctl_table(parport_default_sysctl_table.dev_dir, 0);
 487         return 0;
 488 }
 489
 490 static void __exit parport_default_proc_unregister(void)
 491 {
 492         if (parport_default_sysctl_table.sysctl_header) {
 493                 unregister_sysctl_table(parport_default_sysctl_table.
 494                                         sysctl_header);
 495                 parport_default_sysctl_table.sysctl_header = NULL;
 496         }
 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 static int __init parport_default_proc_register (void)
 522 {
 523         return 0;
 524 }
 525
 526 static void __exit parport_default_proc_unregister (void)
 527 {
 528 }
 529 #endif
 530
 531 module_init(parport_default_proc_register)
 532 module_exit(parport_default_proc_unregister)