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/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
  26 #include <asm/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(ctl_table *table, int write, struct file *filp,
  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(ctl_table *table, int write, struct file *filp,
  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 (ctl_table *table, int write,
 115                                   struct file *filp, 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 (ctl_table *table, int write,
 143                             struct file *filp, 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 (ctl_table *table, int write,
 171                             struct file *filp, 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 (ctl_table *table, int write,
 199                               struct file *filp, 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) { 0, NULL, NULL, 0, 0555, child }
 238 #define PARPORT_PARPORT_DIR(child) { DEV_PARPORT, "parport", \
 239                                      NULL, 0, 0555, child }
 240 #define PARPORT_DEV_DIR(child) { CTL_DEV, "dev", NULL, 0, 0555, child }
 241 #define PARPORT_DEVICES_ROOT_DIR  { DEV_PARPORT_DEVICES, "devices", \
 242                                     NULL, 0, 0555, 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         ctl_table vars[12];
 260         ctl_table device_dir[2];
 261         ctl_table port_dir[2];
 262         ctl_table parport_dir[2];
 263         ctl_table dev_dir[2];
 264 };
 265
 266 static const struct parport_sysctl_table parport_sysctl_template = {
 267         NULL,
 268         {
 269                 { DEV_PARPORT_SPINTIME, "spintime",
 270                   NULL, sizeof(int), 0644, NULL,
 271                   &proc_dointvec_minmax, NULL, NULL,
 272                   (void*) &parport_min_spintime_value,
 273                   (void*) &parport_max_spintime_value },
 274                 { DEV_PARPORT_BASE_ADDR, "base-addr",
 275                   NULL, 0, 0444, NULL,
 276                   &do_hardware_base_addr },
 277                 { DEV_PARPORT_IRQ, "irq",
 278                   NULL, 0, 0444, NULL,
 279                   &do_hardware_irq },
 280                 { DEV_PARPORT_DMA, "dma",
 281                   NULL, 0, 0444, NULL,
 282                   &do_hardware_dma },
 283                 { DEV_PARPORT_MODES, "modes",
 284                   NULL, 0, 0444, NULL,
 285                   &do_hardware_modes },
 286                 PARPORT_DEVICES_ROOT_DIR,
 287 #ifdef CONFIG_PARPORT_1284
 288                 { DEV_PARPORT_AUTOPROBE, "autoprobe",
 289                   NULL, 0, 0444, NULL,
 290                   &do_autoprobe },
 291                 { DEV_PARPORT_AUTOPROBE + 1, "autoprobe0",
 292                  NULL, 0, 0444, NULL,
 293                  &do_autoprobe },
 294                 { DEV_PARPORT_AUTOPROBE + 2, "autoprobe1",
 295                   NULL, 0, 0444, NULL,
 296                   &do_autoprobe },
 297                 { DEV_PARPORT_AUTOPROBE + 3, "autoprobe2",
 298                   NULL, 0, 0444, NULL,
 299                   &do_autoprobe },
 300                 { DEV_PARPORT_AUTOPROBE + 4, "autoprobe3",
 301                   NULL, 0, 0444, NULL,
 302                   &do_autoprobe },
 303 #endif /* IEEE 1284 support */
 304                 {0}
 305         },
 306         { {DEV_PARPORT_DEVICES_ACTIVE, "active", NULL, 0, 0444, NULL,
 307           &do_active_device }, {0}},
 308         { PARPORT_PORT_DIR(NULL), {0}},
 309         { PARPORT_PARPORT_DIR(NULL), {0}},
 310         { PARPORT_DEV_DIR(NULL), {0}}
 311 };
 312
 313 struct parport_device_sysctl_table
 314 {
 315         struct ctl_table_header *sysctl_header;
 316         ctl_table vars[2];
 317         ctl_table device_dir[2];
 318         ctl_table devices_root_dir[2];
 319         ctl_table port_dir[2];
 320         ctl_table parport_dir[2];
 321         ctl_table dev_dir[2];
 322 };
 323
 324 static const struct parport_device_sysctl_table
 325 parport_device_sysctl_template = {
 326         NULL,
 327         {
 328                 { DEV_PARPORT_DEVICE_TIMESLICE, "timeslice",
 329                   NULL, sizeof(int), 0644, NULL,
 330                   &proc_doulongvec_ms_jiffies_minmax, NULL, NULL,
 331                   (void*) &parport_min_timeslice_value,
 332                   (void*) &parport_max_timeslice_value },
 333         },
 334         { {0, NULL, NULL, 0, 0555, NULL}, {0}},
 335         { PARPORT_DEVICES_ROOT_DIR, {0}},
 336         { PARPORT_PORT_DIR(NULL), {0}},
 337         { PARPORT_PARPORT_DIR(NULL), {0}},
 338         { PARPORT_DEV_DIR(NULL), {0}}
 339 };
 340
 341 struct parport_default_sysctl_table
 342 {
 343         struct ctl_table_header *sysctl_header;
 344         ctl_table vars[3];
 345         ctl_table default_dir[2];
 346         ctl_table parport_dir[2];
 347         ctl_table dev_dir[2];
 348 };
 349
 350 extern unsigned long parport_default_timeslice;
 351 extern int parport_default_spintime;
 352
 353 static struct parport_default_sysctl_table
 354 parport_default_sysctl_table = {
 355         NULL,
 356         {
 357                 { DEV_PARPORT_DEFAULT_TIMESLICE, "timeslice",
 358                   &parport_default_timeslice,
 359                   sizeof(parport_default_timeslice), 0644, NULL,
 360                   &proc_doulongvec_ms_jiffies_minmax, NULL, NULL,
 361                   (void*) &parport_min_timeslice_value,
 362                   (void*) &parport_max_timeslice_value },
 363                 { DEV_PARPORT_DEFAULT_SPINTIME, "spintime",
 364                   &parport_default_spintime,
 365                   sizeof(parport_default_spintime), 0644, NULL,
 366                   &proc_dointvec_minmax, NULL, NULL,
 367                   (void*) &parport_min_spintime_value,
 368                   (void*) &parport_max_spintime_value },
 369                 {0}
 370         },
 371         { { DEV_PARPORT_DEFAULT, "default", NULL, 0, 0555,
 372             parport_default_sysctl_table.vars },{0}},
 373         {
 374         PARPORT_PARPORT_DIR(parport_default_sysctl_table.default_dir),
 375         {0}},
 376         { PARPORT_DEV_DIR(parport_default_sysctl_table.parport_dir), {0}}
 377 };
 378
 379
 380 int parport_proc_register(struct parport *port)
 381 {
 382         struct parport_sysctl_table *t;
 383         int i;
 384
 385         t = kmalloc(sizeof(*t), GFP_KERNEL);
 386         if (t == NULL)
 387                 return -ENOMEM;
 388         memcpy(t, &parport_sysctl_template, sizeof(*t));
 389
 390         t->device_dir[0].extra1 = port;
 391
 392         for (i = 0; i < 8; i++)
 393                 t->vars[i].extra1 = port;
 394
 395         t->vars[0].data = &port->spintime;
 396         t->vars[5].child = t->device_dir;
 397
 398         for (i = 0; i < 5; i++)
 399                 t->vars[6 + i].extra2 = &port->probe_info[i];
 400
 401         t->port_dir[0].procname = port->name;
 402         t->port_dir[0].ctl_name = port->number + 1; /* nb 0 isn't legal here */
 403
 404         t->port_dir[0].child = t->vars;
 405         t->parport_dir[0].child = t->port_dir;
 406         t->dev_dir[0].child = t->parport_dir;
 407
 408         t->sysctl_header = register_sysctl_table(t->dev_dir, 0);
 409         if (t->sysctl_header == NULL) {
 410                 kfree(t);
 411                 t = NULL;
 412         }
 413         port->sysctl_table = t;
 414         return 0;
 415 }
 416
 417 int parport_proc_unregister(struct parport *port)
 418 {
 419         if (port->sysctl_table) {
 420                 struct parport_sysctl_table *t = port->sysctl_table;
 421                 port->sysctl_table = NULL;
 422                 unregister_sysctl_table(t->sysctl_header);
 423                 kfree(t);
 424         }
 425         return 0;
 426 }
 427
 428 int parport_device_proc_register(struct pardevice *device)
 429 {
 430         struct parport_device_sysctl_table *t;
 431         struct parport * port = device->port;
 432
 433         t = kmalloc(sizeof(*t), GFP_KERNEL);
 434         if (t == NULL)
 435                 return -ENOMEM;
 436         memcpy(t, &parport_device_sysctl_template, sizeof(*t));
 437
 438         t->dev_dir[0].child = t->parport_dir;
 439         t->parport_dir[0].child = t->port_dir;
 440         t->port_dir[0].procname = port->name;
 441         t->port_dir[0].ctl_name = port->number + 1; /* nb 0 isn't legal here */
 442         t->port_dir[0].child = t->devices_root_dir;
 443         t->devices_root_dir[0].child = t->device_dir;
 444
 445 #ifdef CONFIG_PARPORT_1284
 446
 447         t->device_dir[0].ctl_name =
 448                 parport_device_num(port->number, port->muxport,
 449                                    device->daisy)
 450                 + 1;  /* nb 0 isn't legal here */
 451
 452 #else /* No IEEE 1284 support */
 453
 454         /* parport_device_num isn't available. */
 455         t->device_dir[0].ctl_name = 1;
 456
 457 #endif /* IEEE 1284 support or not */
 458
 459         t->device_dir[0].procname = device->name;
 460         t->device_dir[0].extra1 = device;
 461         t->device_dir[0].child = t->vars;
 462         t->vars[0].data = &device->timeslice;
 463
 464         t->sysctl_header = register_sysctl_table(t->dev_dir, 0);
 465         if (t->sysctl_header == NULL) {
 466                 kfree(t);
 467                 t = NULL;
 468         }
 469         device->sysctl_table = t;
 470         return 0;
 471 }
 472
 473 int parport_device_proc_unregister(struct pardevice *device)
 474 {
 475         if (device->sysctl_table) {
 476                 struct parport_device_sysctl_table *t = device->sysctl_table;
 477                 device->sysctl_table = NULL;
 478                 unregister_sysctl_table(t->sysctl_header);
 479                 kfree(t);
 480         }
 481         return 0;
 482 }
 483
 484 static int __init parport_default_proc_register(void)
 485 {
 486         parport_default_sysctl_table.sysctl_header =
 487                 register_sysctl_table(parport_default_sysctl_table.dev_dir, 0);
 488         return 0;
 489 }
 490
 491 static void __exit parport_default_proc_unregister(void)
 492 {
 493         if (parport_default_sysctl_table.sysctl_header) {
 494                 unregister_sysctl_table(parport_default_sysctl_table.
 495                                         sysctl_header);
 496                 parport_default_sysctl_table.sysctl_header = NULL;
 497         }
 498 }
 499
 500 #else /* no sysctl or no procfs*/
 501
 502 int parport_proc_register(struct parport *pp)
 503 {
 504         return 0;
 505 }
 506
 507 int parport_proc_unregister(struct parport *pp)
 508 {
 509         return 0;
 510 }
 511
 512 int parport_device_proc_register(struct pardevice *device)
 513 {
 514         return 0;
 515 }
 516
 517 int parport_device_proc_unregister(struct pardevice *device)
 518 {
 519         return 0;
 520 }
 521
 522 static int __init parport_default_proc_register (void)
 523 {
 524         return 0;
 525 }
 526
 527 static void __exit parport_default_proc_unregister (void)
 528 {
 529 }
 530 #endif
 531
 532 module_init(parport_default_proc_register)
 533 module_exit(parport_default_proc_unregister)