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   1 /* $Id: hysdn_procconf.c,v 1.8.6.4 2001/09/23 22:24:54 kai Exp $
   2  *
   3  * Linux driver for HYSDN cards, /proc/net filesystem dir and conf functions.
   4  *
   5  * written by Werner Cornelius (werner@titro.de) for Hypercope GmbH
   6  *
   7  * Copyright 1999  by Werner Cornelius (werner@titro.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
  14 #include <linux/cred.h>
  15 #include <linux/module.h>
  16 #include <linux/poll.h>
  17 #include <linux/proc_fs.h>
  18 #include <linux/pci.h>
  19 #include <linux/smp_lock.h>
  20 #include <net/net_namespace.h>
  21
  22 #include "hysdn_defs.h"
  23
  24 static char *hysdn_procconf_revision = "$Revision: 1.8.6.4 $";
  25
  26 #define INFO_OUT_LEN 80         /* length of info line including lf */
  27
  28 /********************************************************/
  29 /* defines and data structure for conf write operations */
  30 /********************************************************/
  31 #define CONF_STATE_DETECT 0     /* waiting for detect */
  32 #define CONF_STATE_CONF   1     /* writing config data */
  33 #define CONF_STATE_POF    2     /* writing pof data */
  34 #define CONF_LINE_LEN   255     /* 255 chars max */
  35
  36 struct conf_writedata {
  37         hysdn_card *card;       /* card the device is connected to */
  38         int buf_size;           /* actual number of bytes in the buffer */
  39         int needed_size;        /* needed size when reading pof */
  40         int state;              /* actual interface states from above constants */
  41         unsigned char conf_line[CONF_LINE_LEN]; /* buffered conf line */
  42         unsigned short channel;         /* active channel number */
  43         unsigned char *pof_buffer;      /* buffer when writing pof */
  44 };
  45
  46 /***********************************************************************/
  47 /* process_line parses one config line and transfers it to the card if */
  48 /* necessary.                                                          */
  49 /* if the return value is negative an error occurred.                   */
  50 /***********************************************************************/
  51 static int
  52 process_line(struct conf_writedata *cnf)
  53 {
  54         unsigned char *cp = cnf->conf_line;
  55         int i;
  56
  57         if (cnf->card->debug_flags & LOG_CNF_LINE)
  58                 hysdn_addlog(cnf->card, "conf line: %s", cp);
  59
  60         if (*cp == '-') {       /* option */
  61                 cp++;           /* point to option char */
  62
  63                 if (*cp++ != 'c')
  64                         return (0);     /* option unknown or used */
  65                 i = 0;          /* start value for channel */
  66                 while ((*cp <= '9') && (*cp >= '0'))
  67                         i = i * 10 + *cp++ - '0';       /* get decimal number */
  68                 if (i > 65535) {
  69                         if (cnf->card->debug_flags & LOG_CNF_MISC)
  70                                 hysdn_addlog(cnf->card, "conf channel invalid  %d", i);
  71                         return (-ERR_INV_CHAN);         /* invalid channel */
  72                 }
  73                 cnf->channel = i & 0xFFFF;      /* set new channel number */
  74                 return (0);     /* success */
  75         }                       /* option */
  76         if (*cp == '*') {       /* line to send */
  77                 if (cnf->card->debug_flags & LOG_CNF_DATA)
  78                         hysdn_addlog(cnf->card, "conf chan=%d %s", cnf->channel, cp);
  79                 return (hysdn_tx_cfgline(cnf->card, cnf->conf_line + 1,
  80                                          cnf->channel));        /* send the line without * */
  81         }                       /* line to send */
  82         return (0);
  83 }                               /* process_line */
  84
  85 /***********************************/
  86 /* conf file operations and tables */
  87 /***********************************/
  88
  89 /****************************************************/
  90 /* write conf file -> boot or send cfg line to card */
  91 /****************************************************/
  92 static ssize_t
  93 hysdn_conf_write(struct file *file, const char __user *buf, size_t count, loff_t * off)
  94 {
  95         struct conf_writedata *cnf;
  96         int i;
  97         unsigned char ch, *cp;
  98
  99         if (!count)
 100                 return (0);     /* nothing to handle */
 101
 102         if (!(cnf = file->private_data))
 103                 return (-EFAULT);       /* should never happen */
 104
 105         if (cnf->state == CONF_STATE_DETECT) {  /* auto detect cnf or pof data */
 106                 if (copy_from_user(&ch, buf, 1))        /* get first char for detect */
 107                         return (-EFAULT);
 108
 109                 if (ch == 0x1A) {
 110                         /* we detected a pof file */
 111                         if ((cnf->needed_size = pof_write_open(cnf->card, &cnf->pof_buffer)) <= 0)
 112                                 return (cnf->needed_size);      /* an error occurred -> exit */
 113                         cnf->buf_size = 0;      /* buffer is empty */
 114                         cnf->state = CONF_STATE_POF;    /* new state */
 115                 } else {
 116                         /* conf data has been detected */
 117                         cnf->buf_size = 0;      /* buffer is empty */
 118                         cnf->state = CONF_STATE_CONF;   /* requested conf data write */
 119                         if (cnf->card->state != CARD_STATE_RUN)
 120                                 return (-ERR_NOT_BOOTED);
 121                         cnf->conf_line[CONF_LINE_LEN - 1] = 0;  /* limit string length */
 122                         cnf->channel = 4098;    /* default channel for output */
 123                 }
 124         }                       /* state was auto detect */
 125         if (cnf->state == CONF_STATE_POF) {     /* pof write active */
 126                 i = cnf->needed_size - cnf->buf_size;   /* bytes still missing for write */
 127                 if (i <= 0)
 128                         return (-EINVAL);       /* size error handling pof */
 129
 130                 if (i < count)
 131                         count = i;      /* limit requested number of bytes */
 132                 if (copy_from_user(cnf->pof_buffer + cnf->buf_size, buf, count))
 133                         return (-EFAULT);       /* error while copying */
 134                 cnf->buf_size += count;
 135
 136                 if (cnf->needed_size == cnf->buf_size) {
 137                         cnf->needed_size = pof_write_buffer(cnf->card, cnf->buf_size);  /* write data */
 138                         if (cnf->needed_size <= 0) {
 139                                 cnf->card->state = CARD_STATE_BOOTERR;  /* show boot error */
 140                                 return (cnf->needed_size);      /* an error occurred */
 141                         }
 142                         cnf->buf_size = 0;      /* buffer is empty again */
 143                 }
 144         }
 145         /* pof write active */
 146         else {                  /* conf write active */
 147
 148                 if (cnf->card->state != CARD_STATE_RUN) {
 149                         if (cnf->card->debug_flags & LOG_CNF_MISC)
 150                                 hysdn_addlog(cnf->card, "cnf write denied -> not booted");
 151                         return (-ERR_NOT_BOOTED);
 152                 }
 153                 i = (CONF_LINE_LEN - 1) - cnf->buf_size;        /* bytes available in buffer */
 154                 if (i > 0) {
 155                         /* copy remaining bytes into buffer */
 156
 157                         if (count > i)
 158                                 count = i;      /* limit transfer */
 159                         if (copy_from_user(cnf->conf_line + cnf->buf_size, buf, count))
 160                                 return (-EFAULT);       /* error while copying */
 161
 162                         i = count;      /* number of chars in buffer */
 163                         cp = cnf->conf_line + cnf->buf_size;
 164                         while (i) {
 165                                 /* search for end of line */
 166                                 if ((*cp < ' ') && (*cp != 9))
 167                                         break;  /* end of line found */
 168                                 cp++;
 169                                 i--;
 170                         }       /* search for end of line */
 171
 172                         if (i) {
 173                                 /* delimiter found */
 174                                 *cp++ = 0;      /* string termination */
 175                                 count -= (i - 1);       /* subtract remaining bytes from count */
 176                                 while ((i) && (*cp < ' ') && (*cp != 9)) {
 177                                         i--;    /* discard next char */
 178                                         count++;        /* mark as read */
 179                                         cp++;   /* next char */
 180                                 }
 181                                 cnf->buf_size = 0;      /* buffer is empty after transfer */
 182                                 if ((i = process_line(cnf)) < 0)        /* handle the line */
 183                                         count = i;      /* return the error */
 184                         }
 185                         /* delimiter found */
 186                         else {
 187                                 cnf->buf_size += count;         /* add chars to string */
 188                                 if (cnf->buf_size >= CONF_LINE_LEN - 1) {
 189                                         if (cnf->card->debug_flags & LOG_CNF_MISC)
 190                                                 hysdn_addlog(cnf->card, "cnf line too long %d chars pos %d", cnf->buf_size, count);
 191                                         return (-ERR_CONF_LONG);
 192                                 }
 193                         }       /* not delimited */
 194
 195                 }
 196                 /* copy remaining bytes into buffer */
 197                 else {
 198                         if (cnf->card->debug_flags & LOG_CNF_MISC)
 199                                 hysdn_addlog(cnf->card, "cnf line too long");
 200                         return (-ERR_CONF_LONG);
 201                 }
 202         }                       /* conf write active */
 203
 204         return (count);
 205 }                               /* hysdn_conf_write */
 206
 207 /*******************************************/
 208 /* read conf file -> output card info data */
 209 /*******************************************/
 210 static ssize_t
 211 hysdn_conf_read(struct file *file, char __user *buf, size_t count, loff_t *off)
 212 {
 213         char *cp;
 214
 215         if (!(file->f_mode & FMODE_READ))
 216                 return -EPERM;  /* no permission to read */
 217
 218         if (!(cp = file->private_data))
 219                 return -EFAULT; /* should never happen */
 220
 221         return simple_read_from_buffer(buf, count, off, cp, strlen(cp));
 222 }                               /* hysdn_conf_read */
 223
 224 /******************/
 225 /* open conf file */
 226 /******************/
 227 static int
 228 hysdn_conf_open(struct inode *ino, struct file *filep)
 229 {
 230         hysdn_card *card;
 231         struct proc_dir_entry *pd;
 232         struct conf_writedata *cnf;
 233         char *cp, *tmp;
 234
 235         /* now search the addressed card */
 236         lock_kernel();
 237         card = card_root;
 238         while (card) {
 239                 pd = card->procconf;
 240                 if (pd == PDE(ino))
 241                         break;
 242                 card = card->next;      /* search next entry */
 243         }
 244         if (!card) {
 245                 unlock_kernel();
 246                 return (-ENODEV);       /* device is unknown/invalid */
 247         }
 248         if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL))
 249                 hysdn_addlog(card, "config open for uid=%d gid=%d mode=0x%x",
 250                              filep->f_cred->fsuid, filep->f_cred->fsgid,
 251                              filep->f_mode);
 252
 253         if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) {
 254                 /* write only access -> write boot file or conf line */
 255
 256                 if (!(cnf = kmalloc(sizeof(struct conf_writedata), GFP_KERNEL))) {
 257                         unlock_kernel();
 258                         return (-EFAULT);
 259                 }
 260                 cnf->card = card;
 261                 cnf->buf_size = 0;      /* nothing buffered */
 262                 cnf->state = CONF_STATE_DETECT;         /* start auto detect */
 263                 filep->private_data = cnf;
 264
 265         } else if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
 266                 /* read access -> output card info data */
 267
 268                 if (!(tmp = kmalloc(INFO_OUT_LEN * 2 + 2, GFP_KERNEL))) {
 269                         unlock_kernel();
 270                         return (-EFAULT);       /* out of memory */
 271                 }
 272                 filep->private_data = tmp;      /* start of string */
 273
 274                 /* first output a headline */
 275                 sprintf(tmp, "id bus slot type irq iobase dp-mem     b-chans fax-chans state device");
 276                 cp = tmp;       /* start of string */
 277                 while (*cp)
 278                         cp++;
 279                 while (((cp - tmp) % (INFO_OUT_LEN + 1)) != INFO_OUT_LEN)
 280                         *cp++ = ' ';
 281                 *cp++ = '\n';
 282
 283                 /* and now the data */
 284                 sprintf(cp, "%d  %3d %4d %4d %3d 0x%04x 0x%08lx %7d %9d %3d   %s",
 285                         card->myid,
 286                         card->bus,
 287                         PCI_SLOT(card->devfn),
 288                         card->brdtype,
 289                         card->irq,
 290                         card->iobase,
 291                         card->membase,
 292                         card->bchans,
 293                         card->faxchans,
 294                         card->state,
 295                         hysdn_net_getname(card));
 296                 while (*cp)
 297                         cp++;
 298                 while (((cp - tmp) % (INFO_OUT_LEN + 1)) != INFO_OUT_LEN)
 299                         *cp++ = ' ';
 300                 *cp++ = '\n';
 301                 *cp = 0;        /* end of string */
 302         } else {                /* simultaneous read/write access forbidden ! */
 303                 unlock_kernel();
 304                 return (-EPERM);        /* no permission this time */
 305         }
 306         unlock_kernel();
 307         return nonseekable_open(ino, filep);
 308 }                               /* hysdn_conf_open */
 309
 310 /***************************/
 311 /* close a config file.    */
 312 /***************************/
 313 static int
 314 hysdn_conf_close(struct inode *ino, struct file *filep)
 315 {
 316         hysdn_card *card;
 317         struct conf_writedata *cnf;
 318         int retval = 0;
 319         struct proc_dir_entry *pd;
 320
 321         lock_kernel();
 322         /* search the addressed card */
 323         card = card_root;
 324         while (card) {
 325                 pd = card->procconf;
 326                 if (pd == PDE(ino))
 327                         break;
 328                 card = card->next;      /* search next entry */
 329         }
 330         if (!card) {
 331                 unlock_kernel();
 332                 return (-ENODEV);       /* device is unknown/invalid */
 333         }
 334         if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL))
 335                 hysdn_addlog(card, "config close for uid=%d gid=%d mode=0x%x",
 336                              filep->f_cred->fsuid, filep->f_cred->fsgid,
 337                              filep->f_mode);
 338
 339         if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) {
 340                 /* write only access -> write boot file or conf line */
 341                 if (filep->private_data) {
 342                         cnf = filep->private_data;
 343
 344                         if (cnf->state == CONF_STATE_POF)
 345                                 retval = pof_write_close(cnf->card);    /* close the pof write */
 346                         kfree(filep->private_data);     /* free allocated memory for buffer */
 347
 348                 }               /* handle write private data */
 349         } else if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
 350                 /* read access -> output card info data */
 351
 352                 kfree(filep->private_data);     /* release memory */
 353         }
 354         unlock_kernel();
 355         return (retval);
 356 }                               /* hysdn_conf_close */
 357
 358 /******************************************************/
 359 /* table for conf filesystem functions defined above. */
 360 /******************************************************/
 361 static const struct file_operations conf_fops =
 362 {
 363         .owner          = THIS_MODULE,
 364         .llseek         = no_llseek,
 365         .read           = hysdn_conf_read,
 366         .write          = hysdn_conf_write,
 367         .open           = hysdn_conf_open,
 368         .release        = hysdn_conf_close,
 369 };
 370
 371 /*****************************/
 372 /* hysdn subdir in /proc/net */
 373 /*****************************/
 374 struct proc_dir_entry *hysdn_proc_entry = NULL;
 375
 376 /*******************************************************************************/
 377 /* hysdn_procconf_init is called when the module is loaded and after the cards */
 378 /* have been detected. The needed proc dir and card config files are created.  */
 379 /* The log init is called at last.                                             */
 380 /*******************************************************************************/
 381 int
 382 hysdn_procconf_init(void)
 383 {
 384         hysdn_card *card;
 385         unsigned char conf_name[20];
 386
 387         hysdn_proc_entry = proc_mkdir(PROC_SUBDIR_NAME, init_net.proc_net);
 388         if (!hysdn_proc_entry) {
 389                 printk(KERN_ERR "HYSDN: unable to create hysdn subdir\n");
 390                 return (-1);
 391         }
 392         card = card_root;       /* point to first card */
 393         while (card) {
 394
 395                 sprintf(conf_name, "%s%d", PROC_CONF_BASENAME, card->myid);
 396                 if ((card->procconf = (void *) proc_create(conf_name,
 397                                                 S_IFREG | S_IRUGO | S_IWUSR,
 398                                                 hysdn_proc_entry,
 399                                                 &conf_fops)) != NULL) {
 400                         hysdn_proclog_init(card);       /* init the log file entry */
 401                 }
 402                 card = card->next;      /* next entry */
 403         }
 404
 405         printk(KERN_NOTICE "HYSDN: procfs Rev. %s initialised\n", hysdn_getrev(hysdn_procconf_revision));
 406         return (0);
 407 }                               /* hysdn_procconf_init */
 408
 409 /*************************************************************************************/
 410 /* hysdn_procconf_release is called when the module is unloaded and before the cards */
 411 /* resources are released. The module counter is assumed to be 0 !                   */
 412 /*************************************************************************************/
 413 void
 414 hysdn_procconf_release(void)
 415 {
 416         hysdn_card *card;
 417         unsigned char conf_name[20];
 418
 419         card = card_root;       /* start with first card */
 420         while (card) {
 421
 422                 sprintf(conf_name, "%s%d", PROC_CONF_BASENAME, card->myid);
 423                 if (card->procconf)
 424                         remove_proc_entry(conf_name, hysdn_proc_entry);
 425
 426                 hysdn_proclog_release(card);    /* init the log file entry */
 427
 428                 card = card->next;      /* point to next card */
 429         }
 430
 431         remove_proc_entry(PROC_SUBDIR_NAME, init_net.proc_net);
 432 }