drivers/isdn/hardware/eicon/divasi.c

   1 /* $Id: divasi.c,v 1.25.6.2 2005/01/31 12:22:20 armin Exp $
   2  *
   3  * Driver for Eicon DIVA Server ISDN cards.
   4  * User Mode IDI Interface
   5  *
   6  * Copyright 2000-2003 by Armin Schindler (mac@melware.de)
   7  * Copyright 2000-2003 Cytronics & Melware (info@melware.de)
   8  *
   9  * This software may be used and distributed according to the terms
  10  * of the GNU General Public License, incorporated herein by reference.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/kernel.h>
  16 #include <linux/sched.h>
  17 #include <linux/poll.h>
  18 #include <linux/proc_fs.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/uaccess.h>
  22
  23 #include "platform.h"
  24 #include "di_defs.h"
  25 #include "divasync.h"
  26 #include "um_xdi.h"
  27 #include "um_idi.h"
  28
  29 static char *main_revision = "$Revision: 1.25.6.2 $";
  30
  31 static int major;
  32
  33 MODULE_DESCRIPTION("User IDI Interface for Eicon ISDN cards");
  34 MODULE_AUTHOR("Cytronics & Melware, Eicon Networks");
  35 MODULE_SUPPORTED_DEVICE("DIVA card driver");
  36 MODULE_LICENSE("GPL");
  37
  38 typedef struct _diva_um_idi_os_context {
  39         wait_queue_head_t read_wait;
  40         wait_queue_head_t close_wait;
  41         struct timer_list diva_timer_id;
  42         int aborted;
  43         int adapter_nr;
  44 } diva_um_idi_os_context_t;
  45
  46 static char *DRIVERNAME = "Eicon DIVA - User IDI (http://www.melware.net)";
  47 static char *DRIVERLNAME = "diva_idi";
  48 static char *DEVNAME = "DivasIDI";
  49 char *DRIVERRELEASE_IDI = "2.0";
  50
  51 extern int idifunc_init(void);
  52 extern void idifunc_finit(void);
  53
  54 /*
  55  *  helper functions
  56  */
  57 static char *getrev(const char *revision)
  58 {
  59         char *rev;
  60         char *p;
  61         if ((p = strchr(revision, ':'))) {
  62                 rev = p + 2;
  63                 p = strchr(rev, '$');
  64                 *--p = 0;
  65         } else
  66                 rev = "1.0";
  67         return rev;
  68 }
  69
  70 /*
  71  *  LOCALS
  72  */
  73 static ssize_t um_idi_read(struct file *file, char __user *buf, size_t count,
  74                            loff_t *offset);
  75 static ssize_t um_idi_write(struct file *file, const char __user *buf,
  76                             size_t count, loff_t *offset);
  77 static unsigned int um_idi_poll(struct file *file, poll_table *wait);
  78 static int um_idi_open(struct inode *inode, struct file *file);
  79 static int um_idi_release(struct inode *inode, struct file *file);
  80 static int remove_entity(void *entity);
  81 static void diva_um_timer_function(unsigned long data);
  82
  83 /*
  84  * proc entry
  85  */
  86 extern struct proc_dir_entry *proc_net_eicon;
  87 static struct proc_dir_entry *um_idi_proc_entry = NULL;
  88
  89 static int um_idi_proc_show(struct seq_file *m, void *v)
  90 {
  91         char tmprev[32];
  92
  93         seq_printf(m, "%s\n", DRIVERNAME);
  94         seq_printf(m, "name     : %s\n", DRIVERLNAME);
  95         seq_printf(m, "release  : %s\n", DRIVERRELEASE_IDI);
  96         strcpy(tmprev, main_revision);
  97         seq_printf(m, "revision : %s\n", getrev(tmprev));
  98         seq_printf(m, "build    : %s\n", DIVA_BUILD);
  99         seq_printf(m, "major    : %d\n", major);
 100
 101         return 0;
 102 }
 103
 104 static int um_idi_proc_open(struct inode *inode, struct file *file)
 105 {
 106         return single_open(file, um_idi_proc_show, NULL);
 107 }
 108
 109 static const struct file_operations um_idi_proc_fops = {
 110         .owner          = THIS_MODULE,
 111         .open           = um_idi_proc_open,
 112         .read           = seq_read,
 113         .llseek         = seq_lseek,
 114         .release        = single_release,
 115 };
 116
 117 static int __init create_um_idi_proc(void)
 118 {
 119         um_idi_proc_entry = proc_create(DRIVERLNAME, S_IRUGO, proc_net_eicon,
 120                                         &um_idi_proc_fops);
 121         if (!um_idi_proc_entry)
 122                 return (0);
 123         return (1);
 124 }
 125
 126 static void remove_um_idi_proc(void)
 127 {
 128         if (um_idi_proc_entry) {
 129                 remove_proc_entry(DRIVERLNAME, proc_net_eicon);
 130                 um_idi_proc_entry = NULL;
 131         }
 132 }
 133
 134 static const struct file_operations divas_idi_fops = {
 135         .owner   = THIS_MODULE,
 136         .llseek  = no_llseek,
 137         .read    = um_idi_read,
 138         .write   = um_idi_write,
 139         .poll    = um_idi_poll,
 140         .open    = um_idi_open,
 141         .release = um_idi_release
 142 };
 143
 144 static void divas_idi_unregister_chrdev(void)
 145 {
 146         unregister_chrdev(major, DEVNAME);
 147 }
 148
 149 static int __init divas_idi_register_chrdev(void)
 150 {
 151         if ((major = register_chrdev(0, DEVNAME, &divas_idi_fops)) < 0)
 152         {
 153                 printk(KERN_ERR "%s: failed to create /dev entry.\n",
 154                        DRIVERLNAME);
 155                 return (0);
 156         }
 157
 158         return (1);
 159 }
 160
 161 /*
 162 ** Driver Load
 163 */
 164 static int __init divasi_init(void)
 165 {
 166         char tmprev[50];
 167         int ret = 0;
 168
 169         printk(KERN_INFO "%s\n", DRIVERNAME);
 170         printk(KERN_INFO "%s: Rel:%s  Rev:", DRIVERLNAME, DRIVERRELEASE_IDI);
 171         strcpy(tmprev, main_revision);
 172         printk("%s  Build: %s\n", getrev(tmprev), DIVA_BUILD);
 173
 174         if (!divas_idi_register_chrdev()) {
 175                 ret = -EIO;
 176                 goto out;
 177         }
 178
 179         if (!create_um_idi_proc()) {
 180                 divas_idi_unregister_chrdev();
 181                 printk(KERN_ERR "%s: failed to create proc entry.\n",
 182                        DRIVERLNAME);
 183                 ret = -EIO;
 184                 goto out;
 185         }
 186
 187         if (!(idifunc_init())) {
 188                 remove_um_idi_proc();
 189                 divas_idi_unregister_chrdev();
 190                 printk(KERN_ERR "%s: failed to connect to DIDD.\n",
 191                        DRIVERLNAME);
 192                 ret = -EIO;
 193                 goto out;
 194         }
 195         printk(KERN_INFO "%s: started with major %d\n", DRIVERLNAME, major);
 196
 197 out:
 198         return (ret);
 199 }
 200
 201
 202 /*
 203 ** Driver Unload
 204 */
 205 static void __exit divasi_exit(void)
 206 {
 207         idifunc_finit();
 208         remove_um_idi_proc();
 209         divas_idi_unregister_chrdev();
 210
 211         printk(KERN_INFO "%s: module unloaded.\n", DRIVERLNAME);
 212 }
 213
 214 module_init(divasi_init);
 215 module_exit(divasi_exit);
 216
 217
 218 /*
 219  *  FILE OPERATIONS
 220  */
 221
 222 static int
 223 divas_um_idi_copy_to_user(void *os_handle, void *dst, const void *src,
 224                           int length)
 225 {
 226         memcpy(dst, src, length);
 227         return (length);
 228 }
 229
 230 static ssize_t
 231 um_idi_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
 232 {
 233         diva_um_idi_os_context_t *p_os;
 234         int ret = -EINVAL;
 235         void *data;
 236
 237         if (!file->private_data) {
 238                 return (-ENODEV);
 239         }
 240
 241         if (!
 242             (p_os =
 243              (diva_um_idi_os_context_t *) diva_um_id_get_os_context(file->
 244                                                                     private_data)))
 245         {
 246                 return (-ENODEV);
 247         }
 248         if (p_os->aborted) {
 249                 return (-ENODEV);
 250         }
 251
 252         if (!(data = diva_os_malloc(0, count))) {
 253                 return (-ENOMEM);
 254         }
 255
 256         ret = diva_um_idi_read(file->private_data,
 257                                file, data, count,
 258                                divas_um_idi_copy_to_user);
 259         switch (ret) {
 260         case 0:         /* no message available */
 261                 ret = (-EAGAIN);
 262                 break;
 263         case (-1):              /* adapter was removed */
 264                 ret = (-ENODEV);
 265                 break;
 266         case (-2):              /* message_length > length of user buffer */
 267                 ret = (-EFAULT);
 268                 break;
 269         }
 270
 271         if (ret > 0) {
 272                 if (copy_to_user(buf, data, ret)) {
 273                         ret = (-EFAULT);
 274                 }
 275         }
 276
 277         diva_os_free(0, data);
 278         DBG_TRC(("read: ret %d", ret));
 279         return (ret);
 280 }
 281
 282
 283 static int
 284 divas_um_idi_copy_from_user(void *os_handle, void *dst, const void *src,
 285                             int length)
 286 {
 287         memcpy(dst, src, length);
 288         return (length);
 289 }
 290
 291 static int um_idi_open_adapter(struct file *file, int adapter_nr)
 292 {
 293         diva_um_idi_os_context_t *p_os;
 294         void *e =
 295                 divas_um_idi_create_entity((dword) adapter_nr, (void *) file);
 296
 297         if (!(file->private_data = e)) {
 298                 return (0);
 299         }
 300         p_os = (diva_um_idi_os_context_t *) diva_um_id_get_os_context(e);
 301         init_waitqueue_head(&p_os->read_wait);
 302         init_waitqueue_head(&p_os->close_wait);
 303         init_timer(&p_os->diva_timer_id);
 304         p_os->diva_timer_id.function = (void *) diva_um_timer_function;
 305         p_os->diva_timer_id.data = (unsigned long) p_os;
 306         p_os->aborted = 0;
 307         p_os->adapter_nr = adapter_nr;
 308         return (1);
 309 }
 310
 311 static ssize_t
 312 um_idi_write(struct file *file, const char __user *buf, size_t count,
 313              loff_t *offset)
 314 {
 315         diva_um_idi_os_context_t *p_os;
 316         int ret = -EINVAL;
 317         void *data;
 318         int adapter_nr = 0;
 319
 320         if (!file->private_data) {
 321                 /* the first write() selects the adapter_nr */
 322                 if (count == sizeof(int)) {
 323                         if (copy_from_user
 324                             ((void *) &adapter_nr, buf,
 325                              count)) return (-EFAULT);
 326                         if (!(um_idi_open_adapter(file, adapter_nr)))
 327                                 return (-ENODEV);
 328                         return (count);
 329                 } else
 330                         return (-ENODEV);
 331         }
 332
 333         if (!(p_os =
 334               (diva_um_idi_os_context_t *) diva_um_id_get_os_context(file->
 335                                                                      private_data)))
 336         {
 337                 return (-ENODEV);
 338         }
 339         if (p_os->aborted) {
 340                 return (-ENODEV);
 341         }
 342
 343         if (!(data = diva_os_malloc(0, count))) {
 344                 return (-ENOMEM);
 345         }
 346
 347         if (copy_from_user(data, buf, count)) {
 348                 ret = -EFAULT;
 349         } else {
 350                 ret = diva_um_idi_write(file->private_data,
 351                                         file, data, count,
 352                                         divas_um_idi_copy_from_user);
 353                 switch (ret) {
 354                 case 0: /* no space available */
 355                         ret = (-EAGAIN);
 356                         break;
 357                 case (-1):      /* adapter was removed */
 358                         ret = (-ENODEV);
 359                         break;
 360                 case (-2):      /* length of user buffer > max message_length */
 361                         ret = (-EFAULT);
 362                         break;
 363                 }
 364         }
 365         diva_os_free(0, data);
 366         DBG_TRC(("write: ret %d", ret));
 367         return (ret);
 368 }
 369
 370 static unsigned int um_idi_poll(struct file *file, poll_table *wait)
 371 {
 372         diva_um_idi_os_context_t *p_os;
 373
 374         if (!file->private_data) {
 375                 return (POLLERR);
 376         }
 377
 378         if ((!(p_os =
 379                (diva_um_idi_os_context_t *)
 380                diva_um_id_get_os_context(file->private_data)))
 381             || p_os->aborted) {
 382                 return (POLLERR);
 383         }
 384
 385         poll_wait(file, &p_os->read_wait, wait);
 386
 387         if (p_os->aborted) {
 388                 return (POLLERR);
 389         }
 390
 391         switch (diva_user_mode_idi_ind_ready(file->private_data, file)) {
 392         case (-1):
 393                 return (POLLERR);
 394
 395         case 0:
 396                 return (0);
 397         }
 398
 399         return (POLLIN | POLLRDNORM);
 400 }
 401
 402 static int um_idi_open(struct inode *inode, struct file *file)
 403 {
 404         return (0);
 405 }
 406
 407
 408 static int um_idi_release(struct inode *inode, struct file *file)
 409 {
 410         diva_um_idi_os_context_t *p_os;
 411         unsigned int adapter_nr;
 412         int ret = 0;
 413
 414         if (!(file->private_data)) {
 415                 ret = -ENODEV;
 416                 goto out;
 417         }
 418
 419         if (!(p_os =
 420               (diva_um_idi_os_context_t *) diva_um_id_get_os_context(file->private_data))) {
 421                 ret = -ENODEV;
 422                 goto out;
 423         }
 424
 425         adapter_nr = p_os->adapter_nr;
 426
 427         if ((ret = remove_entity(file->private_data))) {
 428                 goto out;
 429         }
 430
 431         if (divas_um_idi_delete_entity
 432             ((int) adapter_nr, file->private_data)) {
 433                 ret = -ENODEV;
 434                 goto out;
 435         }
 436
 437 out:
 438         return (ret);
 439 }
 440
 441 int diva_os_get_context_size(void)
 442 {
 443         return (sizeof(diva_um_idi_os_context_t));
 444 }
 445
 446 void diva_os_wakeup_read(void *os_context)
 447 {
 448         diva_um_idi_os_context_t *p_os =
 449                 (diva_um_idi_os_context_t *) os_context;
 450         wake_up_interruptible(&p_os->read_wait);
 451 }
 452
 453 void diva_os_wakeup_close(void *os_context)
 454 {
 455         diva_um_idi_os_context_t *p_os =
 456                 (diva_um_idi_os_context_t *) os_context;
 457         wake_up_interruptible(&p_os->close_wait);
 458 }
 459
 460 static
 461 void diva_um_timer_function(unsigned long data)
 462 {
 463         diva_um_idi_os_context_t *p_os = (diva_um_idi_os_context_t *) data;
 464
 465         p_os->aborted = 1;
 466         wake_up_interruptible(&p_os->read_wait);
 467         wake_up_interruptible(&p_os->close_wait);
 468         DBG_ERR(("entity removal watchdog"))
 469                 }
 470
 471 /*
 472 **  If application exits without entity removal this function will remove
 473 **  entity and block until removal is complete
 474 */
 475 static int remove_entity(void *entity)
 476 {
 477         struct task_struct *curtask = current;
 478         diva_um_idi_os_context_t *p_os;
 479
 480         diva_um_idi_stop_wdog(entity);
 481
 482         if (!entity) {
 483                 DBG_FTL(("Zero entity on remove"))
 484                         return (0);
 485         }
 486
 487         if (!(p_os =
 488               (diva_um_idi_os_context_t *)
 489               diva_um_id_get_os_context(entity))) {
 490                 DBG_FTL(("Zero entity os context on remove"))
 491                         return (0);
 492         }
 493
 494         if (!divas_um_idi_entity_assigned(entity) || p_os->aborted) {
 495                 /*
 496                   Entity is not assigned, also can be removed
 497                 */
 498                 return (0);
 499         }
 500
 501         DBG_TRC(("E(%08x) check remove", entity))
 502
 503                 /*
 504                   If adapter not answers on remove request inside of
 505                   10 Sec, then adapter is dead
 506                 */
 507                 diva_um_idi_start_wdog(entity);
 508
 509         {
 510                 DECLARE_WAITQUEUE(wait, curtask);
 511
 512                 add_wait_queue(&p_os->close_wait, &wait);
 513                 for (;;) {
 514                         set_current_state(TASK_INTERRUPTIBLE);
 515                         if (!divas_um_idi_entity_start_remove(entity)
 516                             || p_os->aborted) {
 517                                 break;
 518                         }
 519                         schedule();
 520                 }
 521                 set_current_state(TASK_RUNNING);
 522                 remove_wait_queue(&p_os->close_wait, &wait);
 523         }
 524
 525         DBG_TRC(("E(%08x) start remove", entity))
 526         {
 527                 DECLARE_WAITQUEUE(wait, curtask);
 528
 529                 add_wait_queue(&p_os->close_wait, &wait);
 530                 for (;;) {
 531                         set_current_state(TASK_INTERRUPTIBLE);
 532                         if (!divas_um_idi_entity_assigned(entity)
 533                             || p_os->aborted) {
 534                                 break;
 535                         }
 536                         schedule();
 537                 }
 538                 set_current_state(TASK_RUNNING);
 539                 remove_wait_queue(&p_os->close_wait, &wait);
 540         }
 541
 542         DBG_TRC(("E(%08x) remove complete, aborted:%d", entity,
 543                  p_os->aborted))
 544
 545                 diva_um_idi_stop_wdog(entity);
 546
 547         p_os->aborted = 0;
 548
 549         return (0);
 550 }
 551
 552 /*
 553  * timer watchdog
 554  */
 555 void diva_um_idi_start_wdog(void *entity)
 556 {
 557         diva_um_idi_os_context_t *p_os;
 558
 559         if (entity &&
 560             ((p_os =
 561               (diva_um_idi_os_context_t *)
 562               diva_um_id_get_os_context(entity)))) {
 563                 mod_timer(&p_os->diva_timer_id, jiffies + 10 * HZ);
 564         }
 565 }
 566
 567 void diva_um_idi_stop_wdog(void *entity)
 568 {
 569         diva_um_idi_os_context_t *p_os;
 570
 571         if (entity &&
 572             ((p_os =
 573               (diva_um_idi_os_context_t *)
 574               diva_um_id_get_os_context(entity)))) {
 575                 del_timer(&p_os->diva_timer_id);
 576         }
 577 }