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