kernel/drivers/isdn/hysdn/hysdn_procconf.c

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