Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Copyright 1999 Digi International (www.digi.com) |
| 4 | * James Puzzo <jamesp at digi dot com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2, or (at your option) |
| 9 | * any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the |
| 13 | * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
| 14 | * PURPOSE. See the GNU General Public License for more details. |
| 15 | * |
| 16 | */ |
| 17 | |
| 18 | /* |
| 19 | * |
| 20 | * Filename: |
| 21 | * |
| 22 | * dgrp_specproc.c |
| 23 | * |
| 24 | * Description: |
| 25 | * |
| 26 | * Handle the "config" proc entry for the linux realport device driver |
| 27 | * and provide slots for the "net" and "mon" devices |
| 28 | * |
| 29 | * Author: |
| 30 | * |
| 31 | * James A. Puzzo |
| 32 | * |
| 33 | */ |
| 34 | |
| 35 | #include <linux/module.h> |
| 36 | #include <linux/tty.h> |
| 37 | #include <linux/sched.h> |
| 38 | #include <linux/cred.h> |
| 39 | #include <linux/proc_fs.h> |
| 40 | #include <linux/ctype.h> |
| 41 | #include <linux/seq_file.h> |
Stephen Rothwell | 4dac211 | 2012-09-25 00:29:20 +1000 | [diff] [blame] | 42 | #include <linux/vmalloc.h> |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 43 | |
| 44 | #include "dgrp_common.h" |
| 45 | |
| 46 | static struct dgrp_proc_entry dgrp_table[]; |
| 47 | static struct proc_dir_entry *dgrp_proc_dir_entry; |
| 48 | |
| 49 | static int dgrp_add_id(long id); |
| 50 | static int dgrp_remove_nd(struct nd_struct *nd); |
| 51 | static void unregister_dgrp_device(struct proc_dir_entry *de); |
| 52 | static void register_dgrp_device(struct nd_struct *node, |
| 53 | struct proc_dir_entry *root, |
| 54 | void (*register_hook)(struct proc_dir_entry *de)); |
| 55 | |
| 56 | /* File operation declarations */ |
| 57 | static int dgrp_gen_proc_open(struct inode *, struct file *); |
| 58 | static int dgrp_gen_proc_close(struct inode *, struct file *); |
| 59 | static int parse_write_config(char *); |
| 60 | |
| 61 | |
| 62 | static const struct file_operations dgrp_proc_file_ops = { |
| 63 | .owner = THIS_MODULE, |
| 64 | .open = dgrp_gen_proc_open, |
| 65 | .release = dgrp_gen_proc_close, |
| 66 | }; |
| 67 | |
| 68 | static struct inode_operations proc_inode_ops = { |
| 69 | .permission = dgrp_inode_permission |
| 70 | }; |
| 71 | |
| 72 | |
| 73 | static void register_proc_table(struct dgrp_proc_entry *, |
| 74 | struct proc_dir_entry *); |
| 75 | static void unregister_proc_table(struct dgrp_proc_entry *, |
| 76 | struct proc_dir_entry *); |
| 77 | |
| 78 | static struct dgrp_proc_entry dgrp_net_table[]; |
| 79 | static struct dgrp_proc_entry dgrp_mon_table[]; |
| 80 | static struct dgrp_proc_entry dgrp_ports_table[]; |
| 81 | static struct dgrp_proc_entry dgrp_dpa_table[]; |
| 82 | |
| 83 | static ssize_t config_proc_write(struct file *file, const char __user *buffer, |
| 84 | size_t count, loff_t *pos); |
| 85 | |
| 86 | static int nodeinfo_proc_open(struct inode *inode, struct file *file); |
| 87 | static int info_proc_open(struct inode *inode, struct file *file); |
| 88 | static int config_proc_open(struct inode *inode, struct file *file); |
| 89 | |
| 90 | static struct file_operations config_proc_file_ops = { |
| 91 | .owner = THIS_MODULE, |
| 92 | .open = config_proc_open, |
| 93 | .read = seq_read, |
| 94 | .llseek = seq_lseek, |
| 95 | .release = seq_release, |
| 96 | .write = config_proc_write |
| 97 | }; |
| 98 | |
| 99 | static struct file_operations info_proc_file_ops = { |
| 100 | .owner = THIS_MODULE, |
| 101 | .open = info_proc_open, |
| 102 | .read = seq_read, |
| 103 | .llseek = seq_lseek, |
| 104 | .release = seq_release, |
| 105 | }; |
| 106 | |
| 107 | static struct file_operations nodeinfo_proc_file_ops = { |
| 108 | .owner = THIS_MODULE, |
| 109 | .open = nodeinfo_proc_open, |
| 110 | .read = seq_read, |
| 111 | .llseek = seq_lseek, |
| 112 | .release = seq_release, |
| 113 | }; |
| 114 | |
| 115 | static struct dgrp_proc_entry dgrp_table[] = { |
| 116 | { |
| 117 | .id = DGRP_CONFIG, |
| 118 | .name = "config", |
| 119 | .mode = 0644, |
| 120 | .proc_file_ops = &config_proc_file_ops, |
| 121 | }, |
| 122 | { |
| 123 | .id = DGRP_INFO, |
| 124 | .name = "info", |
| 125 | .mode = 0644, |
| 126 | .proc_file_ops = &info_proc_file_ops, |
| 127 | }, |
| 128 | { |
| 129 | .id = DGRP_NODEINFO, |
| 130 | .name = "nodeinfo", |
| 131 | .mode = 0644, |
| 132 | .proc_file_ops = &nodeinfo_proc_file_ops, |
| 133 | }, |
| 134 | { |
| 135 | .id = DGRP_NETDIR, |
| 136 | .name = "net", |
| 137 | .mode = 0500, |
| 138 | .child = dgrp_net_table |
| 139 | }, |
| 140 | { |
| 141 | .id = DGRP_MONDIR, |
| 142 | .name = "mon", |
| 143 | .mode = 0500, |
| 144 | .child = dgrp_mon_table |
| 145 | }, |
| 146 | { |
| 147 | .id = DGRP_PORTSDIR, |
| 148 | .name = "ports", |
| 149 | .mode = 0500, |
| 150 | .child = dgrp_ports_table |
| 151 | }, |
| 152 | { |
| 153 | .id = DGRP_DPADIR, |
| 154 | .name = "dpa", |
| 155 | .mode = 0500, |
| 156 | .child = dgrp_dpa_table |
| 157 | } |
| 158 | }; |
| 159 | |
| 160 | static struct proc_dir_entry *net_entry_pointer; |
| 161 | static struct proc_dir_entry *mon_entry_pointer; |
| 162 | static struct proc_dir_entry *dpa_entry_pointer; |
| 163 | static struct proc_dir_entry *ports_entry_pointer; |
| 164 | |
| 165 | static struct dgrp_proc_entry dgrp_net_table[] = { |
| 166 | {0} |
| 167 | }; |
| 168 | |
| 169 | static struct dgrp_proc_entry dgrp_mon_table[] = { |
| 170 | {0} |
| 171 | }; |
| 172 | |
| 173 | static struct dgrp_proc_entry dgrp_ports_table[] = { |
| 174 | {0} |
| 175 | }; |
| 176 | |
| 177 | static struct dgrp_proc_entry dgrp_dpa_table[] = { |
| 178 | {0} |
| 179 | }; |
| 180 | |
| 181 | void dgrp_unregister_proc(void) |
| 182 | { |
| 183 | unregister_proc_table(dgrp_table, dgrp_proc_dir_entry); |
| 184 | net_entry_pointer = NULL; |
| 185 | mon_entry_pointer = NULL; |
| 186 | dpa_entry_pointer = NULL; |
| 187 | ports_entry_pointer = NULL; |
| 188 | |
| 189 | if (dgrp_proc_dir_entry) { |
| 190 | remove_proc_entry(dgrp_proc_dir_entry->name, |
| 191 | dgrp_proc_dir_entry->parent); |
| 192 | dgrp_proc_dir_entry = NULL; |
| 193 | } |
| 194 | |
| 195 | } |
| 196 | |
| 197 | void dgrp_register_proc(void) |
| 198 | { |
| 199 | /* |
| 200 | * Register /proc/dgrp |
| 201 | */ |
| 202 | dgrp_proc_dir_entry = proc_create("dgrp", S_IFDIR, NULL, |
| 203 | &dgrp_proc_file_ops); |
| 204 | register_proc_table(dgrp_table, dgrp_proc_dir_entry); |
| 205 | } |
| 206 | |
| 207 | /* |
| 208 | * /proc/sys support |
| 209 | */ |
| 210 | static int dgrp_proc_match(int len, const char *name, struct proc_dir_entry *de) |
| 211 | { |
| 212 | if (!de || !de->low_ino) |
| 213 | return 0; |
| 214 | if (de->namelen != len) |
| 215 | return 0; |
| 216 | return !memcmp(name, de->name, len); |
| 217 | } |
| 218 | |
| 219 | |
| 220 | /* |
| 221 | * Scan the entries in table and add them all to /proc at the position |
| 222 | * referred to by "root" |
| 223 | */ |
| 224 | static void register_proc_table(struct dgrp_proc_entry *table, |
| 225 | struct proc_dir_entry *root) |
| 226 | { |
| 227 | struct proc_dir_entry *de; |
| 228 | int len; |
| 229 | mode_t mode; |
| 230 | |
| 231 | for (; table->id; table++) { |
| 232 | /* Can't do anything without a proc name. */ |
| 233 | if (!table->name) |
| 234 | continue; |
| 235 | |
| 236 | /* Maybe we can't do anything with it... */ |
| 237 | if (!table->proc_file_ops && |
| 238 | !table->child) { |
| 239 | pr_warn("dgrp: Can't register %s\n", |
| 240 | table->name); |
| 241 | continue; |
| 242 | } |
| 243 | |
| 244 | len = strlen(table->name); |
| 245 | mode = table->mode; |
| 246 | |
| 247 | de = NULL; |
| 248 | if (!table->child) |
| 249 | mode |= S_IFREG; |
| 250 | else { |
| 251 | mode |= S_IFDIR; |
| 252 | for (de = root->subdir; de; de = de->next) { |
| 253 | if (dgrp_proc_match(len, table->name, de)) |
| 254 | break; |
| 255 | } |
| 256 | /* If the subdir exists already, de is non-NULL */ |
| 257 | } |
| 258 | |
| 259 | if (!de) { |
| 260 | de = create_proc_entry(table->name, mode, root); |
| 261 | if (!de) |
| 262 | continue; |
| 263 | de->data = (void *) table; |
| 264 | if (!table->child) { |
| 265 | de->proc_iops = &proc_inode_ops; |
| 266 | if (table->proc_file_ops) |
| 267 | de->proc_fops = table->proc_file_ops; |
| 268 | else |
| 269 | de->proc_fops = &dgrp_proc_file_ops; |
| 270 | } |
| 271 | } |
| 272 | table->de = de; |
| 273 | if (de->mode & S_IFDIR) |
| 274 | register_proc_table(table->child, de); |
| 275 | |
| 276 | if (table->id == DGRP_NETDIR) |
| 277 | net_entry_pointer = de; |
| 278 | |
| 279 | if (table->id == DGRP_MONDIR) |
| 280 | mon_entry_pointer = de; |
| 281 | |
| 282 | if (table->id == DGRP_DPADIR) |
| 283 | dpa_entry_pointer = de; |
| 284 | |
| 285 | if (table->id == DGRP_PORTSDIR) |
| 286 | ports_entry_pointer = de; |
| 287 | } |
| 288 | } |
| 289 | |
| 290 | /* |
| 291 | * Unregister a /proc sysctl table and any subdirectories. |
| 292 | */ |
| 293 | static void unregister_proc_table(struct dgrp_proc_entry *table, |
| 294 | struct proc_dir_entry *root) |
| 295 | { |
| 296 | struct proc_dir_entry *de; |
| 297 | struct nd_struct *tmp; |
| 298 | |
| 299 | list_for_each_entry(tmp, &nd_struct_list, list) { |
| 300 | if ((table == dgrp_net_table) && (tmp->nd_net_de)) { |
| 301 | unregister_dgrp_device(tmp->nd_net_de); |
| 302 | dgrp_remove_node_class_sysfs_files(tmp); |
| 303 | } |
| 304 | |
| 305 | if ((table == dgrp_mon_table) && (tmp->nd_mon_de)) |
| 306 | unregister_dgrp_device(tmp->nd_mon_de); |
| 307 | |
| 308 | if ((table == dgrp_dpa_table) && (tmp->nd_dpa_de)) |
| 309 | unregister_dgrp_device(tmp->nd_dpa_de); |
| 310 | |
| 311 | if ((table == dgrp_ports_table) && (tmp->nd_ports_de)) |
| 312 | unregister_dgrp_device(tmp->nd_ports_de); |
| 313 | } |
| 314 | |
| 315 | for (; table->id; table++) { |
| 316 | de = table->de; |
| 317 | |
| 318 | if (!de) |
| 319 | continue; |
| 320 | if (de->mode & S_IFDIR) { |
| 321 | if (!table->child) { |
| 322 | pr_alert("dgrp: malformed sysctl tree on free\n"); |
| 323 | continue; |
| 324 | } |
| 325 | unregister_proc_table(table->child, de); |
| 326 | |
| 327 | /* Don't unregister directories which still have entries */ |
| 328 | if (de->subdir) |
| 329 | continue; |
| 330 | } |
| 331 | |
| 332 | /* Don't unregister proc entries that are still being used.. */ |
| 333 | if ((atomic_read(&de->count)) != 1) { |
| 334 | pr_alert("proc entry %s in use, not removing\n", |
| 335 | de->name); |
| 336 | continue; |
| 337 | } |
| 338 | |
| 339 | remove_proc_entry(de->name, de->parent); |
| 340 | table->de = NULL; |
| 341 | } |
| 342 | } |
| 343 | |
| 344 | static int dgrp_gen_proc_open(struct inode *inode, struct file *file) |
| 345 | { |
| 346 | struct proc_dir_entry *de; |
| 347 | struct dgrp_proc_entry *entry; |
| 348 | int ret = 0; |
| 349 | |
| 350 | de = (struct proc_dir_entry *) PDE(file->f_dentry->d_inode); |
| 351 | if (!de || !de->data) { |
| 352 | ret = -ENXIO; |
| 353 | goto done; |
| 354 | } |
| 355 | |
| 356 | entry = (struct dgrp_proc_entry *) de->data; |
| 357 | if (!entry) { |
| 358 | ret = -ENXIO; |
| 359 | goto done; |
| 360 | } |
| 361 | |
| 362 | down(&entry->excl_sem); |
| 363 | |
| 364 | if (entry->excl_cnt) |
| 365 | ret = -EBUSY; |
| 366 | else |
| 367 | entry->excl_cnt++; |
| 368 | |
| 369 | up(&entry->excl_sem); |
| 370 | |
| 371 | done: |
| 372 | return ret; |
| 373 | } |
| 374 | |
| 375 | static int dgrp_gen_proc_close(struct inode *inode, struct file *file) |
| 376 | { |
| 377 | struct proc_dir_entry *de; |
| 378 | struct dgrp_proc_entry *entry; |
| 379 | |
| 380 | de = (struct proc_dir_entry *) PDE(file->f_dentry->d_inode); |
| 381 | if (!de || !de->data) |
| 382 | goto done; |
| 383 | |
| 384 | entry = (struct dgrp_proc_entry *) de->data; |
| 385 | if (!entry) |
| 386 | goto done; |
| 387 | |
| 388 | down(&entry->excl_sem); |
| 389 | |
| 390 | if (entry->excl_cnt) |
| 391 | entry->excl_cnt = 0; |
| 392 | |
| 393 | up(&entry->excl_sem); |
| 394 | |
| 395 | done: |
| 396 | return 0; |
| 397 | } |
| 398 | |
| 399 | static void *config_proc_start(struct seq_file *m, loff_t *pos) |
| 400 | { |
| 401 | return seq_list_start_head(&nd_struct_list, *pos); |
| 402 | } |
| 403 | |
| 404 | static void *config_proc_next(struct seq_file *p, void *v, loff_t *pos) |
| 405 | { |
| 406 | return seq_list_next(v, &nd_struct_list, pos); |
| 407 | } |
| 408 | |
| 409 | static void config_proc_stop(struct seq_file *m, void *v) |
| 410 | { |
| 411 | } |
| 412 | |
| 413 | static int config_proc_show(struct seq_file *m, void *v) |
| 414 | { |
| 415 | struct nd_struct *nd; |
| 416 | char tmp_id[4]; |
| 417 | |
| 418 | if (v == &nd_struct_list) { |
| 419 | seq_puts(m, "#-----------------------------------------------------------------------------\n"); |
| 420 | seq_puts(m, "# Avail\n"); |
| 421 | seq_puts(m, "# ID Major State Ports\n"); |
| 422 | return 0; |
| 423 | } |
| 424 | |
| 425 | nd = list_entry(v, struct nd_struct, list); |
| 426 | |
| 427 | ID_TO_CHAR(nd->nd_ID, tmp_id); |
| 428 | |
| 429 | seq_printf(m, " %-2.2s %-5ld %-10.10s %-5d\n", |
| 430 | tmp_id, |
| 431 | nd->nd_major, |
| 432 | ND_STATE_STR(nd->nd_state), |
| 433 | nd->nd_chan_count); |
| 434 | |
| 435 | return 0; |
| 436 | } |
| 437 | |
| 438 | static const struct seq_operations proc_config_ops = { |
| 439 | .start = config_proc_start, |
| 440 | .next = config_proc_next, |
| 441 | .stop = config_proc_stop, |
| 442 | .show = config_proc_show |
| 443 | }; |
| 444 | |
| 445 | static int config_proc_open(struct inode *inode, struct file *file) |
| 446 | { |
| 447 | return seq_open(file, &proc_config_ops); |
| 448 | } |
| 449 | |
| 450 | |
| 451 | /* |
| 452 | * When writing configuration information, each "record" (i.e. each |
| 453 | * write) is treated as an independent request. See the "parse" |
| 454 | * description for more details. |
| 455 | */ |
| 456 | static ssize_t config_proc_write(struct file *file, const char __user *buffer, |
| 457 | size_t count, loff_t *pos) |
| 458 | { |
| 459 | ssize_t retval; |
| 460 | char *inbuf, *sp; |
| 461 | char *line, *ldelim; |
| 462 | |
| 463 | if (count > 32768) |
| 464 | return -EINVAL; |
| 465 | |
| 466 | inbuf = sp = vzalloc(count + 1); |
| 467 | if (!inbuf) |
| 468 | return -ENOMEM; |
| 469 | |
| 470 | if (copy_from_user(inbuf, buffer, count)) { |
| 471 | retval = -EFAULT; |
| 472 | goto done; |
| 473 | } |
| 474 | |
| 475 | inbuf[count] = 0; |
| 476 | |
| 477 | ldelim = "\n"; |
| 478 | |
| 479 | line = strpbrk(sp, ldelim); |
| 480 | while (line) { |
| 481 | *line = 0; |
| 482 | retval = parse_write_config(sp); |
| 483 | if (retval) |
| 484 | goto done; |
| 485 | |
| 486 | sp = line + 1; |
| 487 | line = strpbrk(sp, ldelim); |
| 488 | } |
| 489 | |
| 490 | retval = count; |
| 491 | done: |
| 492 | vfree(inbuf); |
| 493 | return retval; |
| 494 | } |
| 495 | |
| 496 | /* |
| 497 | * ------------------------------------------------------------------------ |
| 498 | * |
| 499 | * The following are the functions to parse input |
| 500 | * |
| 501 | * ------------------------------------------------------------------------ |
| 502 | */ |
| 503 | static inline char *skip_past_ws(const char *str) |
| 504 | { |
| 505 | while ((*str) && !isspace(*str)) |
| 506 | ++str; |
| 507 | |
| 508 | return skip_spaces(str); |
| 509 | } |
| 510 | |
| 511 | static int parse_id(char **c, char *cID) |
| 512 | { |
| 513 | int tmp = **c; |
| 514 | |
| 515 | if (isalnum(tmp) || (tmp == '_')) |
| 516 | cID[0] = tmp; |
| 517 | else |
| 518 | return -EINVAL; |
| 519 | |
| 520 | (*c)++; tmp = **c; |
| 521 | |
| 522 | if (isalnum(tmp) || (tmp == '_')) { |
| 523 | cID[1] = tmp; |
| 524 | (*c)++; |
| 525 | } else |
| 526 | cID[1] = 0; |
| 527 | |
| 528 | return 0; |
| 529 | } |
| 530 | |
| 531 | static int parse_add_config(char *buf) |
| 532 | { |
| 533 | char *c = buf; |
| 534 | int retval; |
| 535 | char cID[2]; |
| 536 | long ID; |
| 537 | |
| 538 | c = skip_past_ws(c); |
| 539 | |
| 540 | retval = parse_id(&c, cID); |
| 541 | if (retval < 0) |
| 542 | return retval; |
| 543 | |
| 544 | ID = CHAR_TO_ID(cID); |
| 545 | |
| 546 | c = skip_past_ws(c); |
| 547 | |
| 548 | return dgrp_add_id(ID); |
| 549 | } |
| 550 | |
| 551 | static int parse_del_config(char *buf) |
| 552 | { |
| 553 | char *c = buf; |
| 554 | int retval; |
| 555 | struct nd_struct *nd; |
| 556 | char cID[2]; |
| 557 | long ID; |
| 558 | long major; |
| 559 | |
| 560 | c = skip_past_ws(c); |
| 561 | |
| 562 | retval = parse_id(&c, cID); |
| 563 | if (retval < 0) |
| 564 | return retval; |
| 565 | |
| 566 | ID = CHAR_TO_ID(cID); |
| 567 | |
| 568 | c = skip_past_ws(c); |
| 569 | |
| 570 | retval = kstrtol(c, 10, &major); |
| 571 | if (retval) |
| 572 | return retval; |
| 573 | |
| 574 | nd = nd_struct_get(major); |
| 575 | if (!nd) |
| 576 | return -EINVAL; |
| 577 | |
| 578 | if ((nd->nd_major != major) || (nd->nd_ID != ID)) |
| 579 | return -EINVAL; |
| 580 | |
| 581 | return dgrp_remove_nd(nd); |
| 582 | } |
| 583 | |
| 584 | static int parse_chg_config(char *buf) |
| 585 | { |
| 586 | return -EINVAL; |
| 587 | } |
| 588 | |
| 589 | /* |
| 590 | * The passed character buffer represents a single configuration request. |
| 591 | * If the first character is a "+", it is parsed as a request to add a |
| 592 | * PortServer |
| 593 | * If the first character is a "-", it is parsed as a request to delete a |
| 594 | * PortServer |
| 595 | * If the first character is a "*", it is parsed as a request to change a |
| 596 | * PortServer |
| 597 | * Any other character (including whitespace) causes the record to be |
| 598 | * ignored. |
| 599 | */ |
| 600 | static int parse_write_config(char *buf) |
| 601 | { |
| 602 | int retval; |
| 603 | |
| 604 | switch (buf[0]) { |
| 605 | case '+': |
| 606 | retval = parse_add_config(buf); |
| 607 | break; |
| 608 | case '-': |
| 609 | retval = parse_del_config(buf); |
| 610 | break; |
| 611 | case '*': |
| 612 | retval = parse_chg_config(buf); |
| 613 | break; |
| 614 | default: |
| 615 | retval = -EINVAL; |
| 616 | } |
| 617 | |
| 618 | return retval; |
| 619 | } |
| 620 | |
| 621 | static int info_proc_show(struct seq_file *m, void *v) |
| 622 | { |
| 623 | seq_printf(m, "version: %s\n", DIGI_VERSION); |
| 624 | seq_puts(m, "register_with_sysfs: 1\n"); |
| 625 | seq_printf(m, "rawreadok: 0x%08x\t(%d)\n", |
| 626 | dgrp_rawreadok, dgrp_rawreadok); |
| 627 | seq_printf(m, "pollrate: 0x%08x\t(%d)\n", |
| 628 | dgrp_poll_tick, dgrp_poll_tick); |
| 629 | |
| 630 | return 0; |
| 631 | } |
| 632 | |
| 633 | static int info_proc_open(struct inode *inode, struct file *file) |
| 634 | { |
| 635 | return single_open(file, info_proc_show, NULL); |
| 636 | } |
| 637 | |
| 638 | |
| 639 | static void *nodeinfo_start(struct seq_file *m, loff_t *pos) |
| 640 | { |
| 641 | return seq_list_start_head(&nd_struct_list, *pos); |
| 642 | } |
| 643 | |
| 644 | static void *nodeinfo_next(struct seq_file *p, void *v, loff_t *pos) |
| 645 | { |
| 646 | return seq_list_next(v, &nd_struct_list, pos); |
| 647 | } |
| 648 | |
| 649 | static void nodeinfo_stop(struct seq_file *m, void *v) |
| 650 | { |
| 651 | } |
| 652 | |
| 653 | static int nodeinfo_show(struct seq_file *m, void *v) |
| 654 | { |
| 655 | struct nd_struct *nd; |
| 656 | char hwver[8]; |
| 657 | char swver[8]; |
| 658 | char tmp_id[4]; |
| 659 | |
| 660 | if (v == &nd_struct_list) { |
| 661 | seq_puts(m, "#-----------------------------------------------------------------------------\n"); |
| 662 | seq_puts(m, "# HW HW SW\n"); |
| 663 | seq_puts(m, "# ID State Version ID Version Description\n"); |
| 664 | return 0; |
| 665 | } |
| 666 | |
| 667 | nd = list_entry(v, struct nd_struct, list); |
| 668 | |
| 669 | ID_TO_CHAR(nd->nd_ID, tmp_id); |
| 670 | |
| 671 | if (nd->nd_state == NS_READY) { |
| 672 | sprintf(hwver, "%d.%d", (nd->nd_hw_ver >> 8) & 0xff, |
| 673 | nd->nd_hw_ver & 0xff); |
| 674 | sprintf(swver, "%d.%d", (nd->nd_sw_ver >> 8) & 0xff, |
| 675 | nd->nd_sw_ver & 0xff); |
| 676 | seq_printf(m, " %-2.2s %-10.10s %-7.7s %-3d %-7.7s %-35.35s\n", |
| 677 | tmp_id, |
| 678 | ND_STATE_STR(nd->nd_state), |
| 679 | hwver, |
| 680 | nd->nd_hw_id, |
| 681 | swver, |
| 682 | nd->nd_ps_desc); |
| 683 | |
| 684 | } else { |
| 685 | seq_printf(m, " %-2.2s %-10.10s\n", |
| 686 | tmp_id, |
| 687 | ND_STATE_STR(nd->nd_state)); |
| 688 | } |
| 689 | |
| 690 | return 0; |
| 691 | } |
| 692 | |
| 693 | |
| 694 | static const struct seq_operations nodeinfo_ops = { |
| 695 | .start = nodeinfo_start, |
| 696 | .next = nodeinfo_next, |
| 697 | .stop = nodeinfo_stop, |
| 698 | .show = nodeinfo_show |
| 699 | }; |
| 700 | |
| 701 | static int nodeinfo_proc_open(struct inode *inode, struct file *file) |
| 702 | { |
| 703 | return seq_open(file, &nodeinfo_ops); |
| 704 | } |
| 705 | |
| 706 | /** |
| 707 | * dgrp_add_id() -- creates new nd struct and adds it to list |
| 708 | * @id: id of device to add |
| 709 | */ |
| 710 | static int dgrp_add_id(long id) |
| 711 | { |
| 712 | struct nd_struct *nd; |
| 713 | int ret; |
| 714 | int i; |
| 715 | |
| 716 | nd = kzalloc(sizeof(struct nd_struct), GFP_KERNEL); |
| 717 | if (!nd) |
| 718 | return -ENOMEM; |
| 719 | |
| 720 | nd->nd_major = 0; |
| 721 | nd->nd_ID = id; |
| 722 | |
| 723 | spin_lock_init(&nd->nd_lock); |
| 724 | |
| 725 | init_waitqueue_head(&nd->nd_tx_waitq); |
| 726 | init_waitqueue_head(&nd->nd_mon_wqueue); |
| 727 | init_waitqueue_head(&nd->nd_dpa_wqueue); |
| 728 | for (i = 0; i < SEQ_MAX; i++) |
| 729 | init_waitqueue_head(&nd->nd_seq_wque[i]); |
| 730 | |
| 731 | /* setup the structures to get the major number */ |
| 732 | ret = dgrp_tty_init(nd); |
| 733 | if (ret) |
| 734 | goto error_out; |
| 735 | |
| 736 | nd->nd_major = nd->nd_serial_ttdriver->major; |
| 737 | |
| 738 | ret = nd_struct_add(nd); |
| 739 | if (ret) |
| 740 | goto error_out; |
| 741 | |
| 742 | register_dgrp_device(nd, net_entry_pointer, dgrp_register_net_hook); |
| 743 | register_dgrp_device(nd, mon_entry_pointer, dgrp_register_mon_hook); |
| 744 | register_dgrp_device(nd, dpa_entry_pointer, dgrp_register_dpa_hook); |
| 745 | register_dgrp_device(nd, ports_entry_pointer, |
| 746 | dgrp_register_ports_hook); |
| 747 | |
| 748 | return 0; |
| 749 | |
| 750 | error_out: |
| 751 | kfree(nd); |
| 752 | return ret; |
| 753 | |
| 754 | } |
| 755 | |
| 756 | static int dgrp_remove_nd(struct nd_struct *nd) |
| 757 | { |
| 758 | int ret; |
| 759 | |
| 760 | /* Check to see if the selected structure is in use */ |
| 761 | if (nd->nd_tty_ref_cnt) |
| 762 | return -EBUSY; |
| 763 | |
| 764 | if (nd->nd_net_de) { |
| 765 | unregister_dgrp_device(nd->nd_net_de); |
| 766 | dgrp_remove_node_class_sysfs_files(nd); |
| 767 | } |
| 768 | |
| 769 | if (nd->nd_mon_de) |
| 770 | unregister_dgrp_device(nd->nd_mon_de); |
| 771 | |
| 772 | if (nd->nd_ports_de) |
| 773 | unregister_dgrp_device(nd->nd_ports_de); |
| 774 | |
| 775 | if (nd->nd_dpa_de) |
| 776 | unregister_dgrp_device(nd->nd_dpa_de); |
| 777 | |
| 778 | dgrp_tty_uninit(nd); |
| 779 | |
| 780 | ret = nd_struct_del(nd); |
| 781 | if (ret) |
| 782 | return ret; |
| 783 | |
| 784 | kfree(nd); |
| 785 | return 0; |
| 786 | } |
| 787 | |
| 788 | static void register_dgrp_device(struct nd_struct *node, |
| 789 | struct proc_dir_entry *root, |
| 790 | void (*register_hook)(struct proc_dir_entry *de)) |
| 791 | { |
| 792 | char buf[3]; |
| 793 | struct proc_dir_entry *de; |
| 794 | |
| 795 | ID_TO_CHAR(node->nd_ID, buf); |
| 796 | |
| 797 | de = create_proc_entry(buf, 0600 | S_IFREG, root); |
| 798 | if (!de) |
| 799 | return; |
| 800 | |
| 801 | de->data = (void *) node; |
| 802 | |
| 803 | if (register_hook) |
| 804 | register_hook(de); |
| 805 | |
| 806 | } |
| 807 | |
| 808 | static void unregister_dgrp_device(struct proc_dir_entry *de) |
| 809 | { |
| 810 | if (!de) |
| 811 | return; |
| 812 | |
| 813 | /* Don't unregister proc entries that are still being used.. */ |
| 814 | if ((atomic_read(&de->count)) != 1) { |
| 815 | pr_alert("%s - proc entry %s in use. Not removing.\n", |
| 816 | __func__, de->name); |
| 817 | return; |
| 818 | } |
| 819 | |
| 820 | remove_proc_entry(de->name, de->parent); |
| 821 | de = NULL; |
| 822 | } |