/* $Id: hysdn_procconf.c,v 1.8.6.4 2001/09/23 22:24:54 kai Exp $ * * Linux driver for HYSDN cards, /proc/net filesystem dir and conf functions. * * written by Werner Cornelius (werner@titro.de) for Hypercope GmbH * * Copyright 1999 by Werner Cornelius (werner@titro.de) * * This software may be used and distributed according to the terms * of the GNU General Public License, incorporated herein by reference. * */ #include #include #include #include #include #include #include #include #include "hysdn_defs.h" static DEFINE_MUTEX(hysdn_conf_mutex); #define INFO_OUT_LEN 80 /* length of info line including lf */ /********************************************************/ /* defines and data structure for conf write operations */ /********************************************************/ #define CONF_STATE_DETECT 0 /* waiting for detect */ #define CONF_STATE_CONF 1 /* writing config data */ #define CONF_STATE_POF 2 /* writing pof data */ #define CONF_LINE_LEN 255 /* 255 chars max */ struct conf_writedata { hysdn_card *card; /* card the device is connected to */ int buf_size; /* actual number of bytes in the buffer */ int needed_size; /* needed size when reading pof */ int state; /* actual interface states from above constants */ unsigned char conf_line[CONF_LINE_LEN]; /* buffered conf line */ unsigned short channel; /* active channel number */ unsigned char *pof_buffer; /* buffer when writing pof */ }; /***********************************************************************/ /* process_line parses one config line and transfers it to the card if */ /* necessary. */ /* if the return value is negative an error occurred. */ /***********************************************************************/ static int process_line(struct conf_writedata *cnf) { unsigned char *cp = cnf->conf_line; int i; if (cnf->card->debug_flags & LOG_CNF_LINE) hysdn_addlog(cnf->card, "conf line: %s", cp); if (*cp == '-') { /* option */ cp++; /* point to option char */ if (*cp++ != 'c') return (0); /* option unknown or used */ i = 0; /* start value for channel */ while ((*cp <= '9') && (*cp >= '0')) i = i * 10 + *cp++ - '0'; /* get decimal number */ if (i > 65535) { if (cnf->card->debug_flags & LOG_CNF_MISC) hysdn_addlog(cnf->card, "conf channel invalid %d", i); return (-ERR_INV_CHAN); /* invalid channel */ } cnf->channel = i & 0xFFFF; /* set new channel number */ return (0); /* success */ } /* option */ if (*cp == '*') { /* line to send */ if (cnf->card->debug_flags & LOG_CNF_DATA) hysdn_addlog(cnf->card, "conf chan=%d %s", cnf->channel, cp); return (hysdn_tx_cfgline(cnf->card, cnf->conf_line + 1, cnf->channel)); /* send the line without * */ } /* line to send */ return (0); } /* process_line */ /***********************************/ /* conf file operations and tables */ /***********************************/ /****************************************************/ /* write conf file -> boot or send cfg line to card */ /****************************************************/ static ssize_t hysdn_conf_write(struct file *file, const char __user *buf, size_t count, loff_t * off) { struct conf_writedata *cnf; int i; unsigned char ch, *cp; if (!count) return (0); /* nothing to handle */ if (!(cnf = file->private_data)) return (-EFAULT); /* should never happen */ if (cnf->state == CONF_STATE_DETECT) { /* auto detect cnf or pof data */ if (copy_from_user(&ch, buf, 1)) /* get first char for detect */ return (-EFAULT); if (ch == 0x1A) { /* we detected a pof file */ if ((cnf->needed_size = pof_write_open(cnf->card, &cnf->pof_buffer)) <= 0) return (cnf->needed_size); /* an error occurred -> exit */ cnf->buf_size = 0; /* buffer is empty */ cnf->state = CONF_STATE_POF; /* new state */ } else { /* conf data has been detected */ cnf->buf_size = 0; /* buffer is empty */ cnf->state = CONF_STATE_CONF; /* requested conf data write */ if (cnf->card->state != CARD_STATE_RUN) return (-ERR_NOT_BOOTED); cnf->conf_line[CONF_LINE_LEN - 1] = 0; /* limit string length */ cnf->channel = 4098; /* default channel for output */ } } /* state was auto detect */ if (cnf->state == CONF_STATE_POF) { /* pof write active */ i = cnf->needed_size - cnf->buf_size; /* bytes still missing for write */ if (i <= 0) return (-EINVAL); /* size error handling pof */ if (i < count) count = i; /* limit requested number of bytes */ if (copy_from_user(cnf->pof_buffer + cnf->buf_size, buf, count)) return (-EFAULT); /* error while copying */ cnf->buf_size += count; if (cnf->needed_size == cnf->buf_size) { cnf->needed_size = pof_write_buffer(cnf->card, cnf->buf_size); /* write data */ if (cnf->needed_size <= 0) { cnf->card->state = CARD_STATE_BOOTERR; /* show boot error */ return (cnf->needed_size); /* an error occurred */ } cnf->buf_size = 0; /* buffer is empty again */ } } /* pof write active */ else { /* conf write active */ if (cnf->card->state != CARD_STATE_RUN) { if (cnf->card->debug_flags & LOG_CNF_MISC) hysdn_addlog(cnf->card, "cnf write denied -> not booted"); return (-ERR_NOT_BOOTED); } i = (CONF_LINE_LEN - 1) - cnf->buf_size; /* bytes available in buffer */ if (i > 0) { /* copy remaining bytes into buffer */ if (count > i) count = i; /* limit transfer */ if (copy_from_user(cnf->conf_line + cnf->buf_size, buf, count)) return (-EFAULT); /* error while copying */ i = count; /* number of chars in buffer */ cp = cnf->conf_line + cnf->buf_size; while (i) { /* search for end of line */ if ((*cp < ' ') && (*cp != 9)) break; /* end of line found */ cp++; i--; } /* search for end of line */ if (i) { /* delimiter found */ *cp++ = 0; /* string termination */ count -= (i - 1); /* subtract remaining bytes from count */ while ((i) && (*cp < ' ') && (*cp != 9)) { i--; /* discard next char */ count++; /* mark as read */ cp++; /* next char */ } cnf->buf_size = 0; /* buffer is empty after transfer */ if ((i = process_line(cnf)) < 0) /* handle the line */ count = i; /* return the error */ } /* delimiter found */ else { cnf->buf_size += count; /* add chars to string */ if (cnf->buf_size >= CONF_LINE_LEN - 1) { if (cnf->card->debug_flags & LOG_CNF_MISC) hysdn_addlog(cnf->card, "cnf line too long %d chars pos %d", cnf->buf_size, count); return (-ERR_CONF_LONG); } } /* not delimited */ } /* copy remaining bytes into buffer */ else { if (cnf->card->debug_flags & LOG_CNF_MISC) hysdn_addlog(cnf->card, "cnf line too long"); return (-ERR_CONF_LONG); } } /* conf write active */ return (count); } /* hysdn_conf_write */ /*******************************************/ /* read conf file -> output card info data */ /*******************************************/ static ssize_t hysdn_conf_read(struct file *file, char __user *buf, size_t count, loff_t *off) { char *cp; if (!(file->f_mode & FMODE_READ)) return -EPERM; /* no permission to read */ if (!(cp = file->private_data)) return -EFAULT; /* should never happen */ return simple_read_from_buffer(buf, count, off, cp, strlen(cp)); } /* hysdn_conf_read */ /******************/ /* open conf file */ /******************/ static int hysdn_conf_open(struct inode *ino, struct file *filep) { hysdn_card *card; struct proc_dir_entry *pd; struct conf_writedata *cnf; char *cp, *tmp; /* now search the addressed card */ mutex_lock(&hysdn_conf_mutex); card = card_root; while (card) { pd = card->procconf; if (pd == PDE(ino)) break; card = card->next; /* search next entry */ } if (!card) { mutex_unlock(&hysdn_conf_mutex); return (-ENODEV); /* device is unknown/invalid */ } if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL)) hysdn_addlog(card, "config open for uid=%d gid=%d mode=0x%x", filep->f_cred->fsuid, filep->f_cred->fsgid, filep->f_mode); if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) { /* write only access -> write boot file or conf line */ if (!(cnf = kmalloc(sizeof(struct conf_writedata), GFP_KERNEL))) { mutex_unlock(&hysdn_conf_mutex); return (-EFAULT); } cnf->card = card; cnf->buf_size = 0; /* nothing buffered */ cnf->state = CONF_STATE_DETECT; /* start auto detect */ filep->private_data = cnf; } else if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) { /* read access -> output card info data */ if (!(tmp = kmalloc(INFO_OUT_LEN * 2 + 2, GFP_KERNEL))) { mutex_unlock(&hysdn_conf_mutex); return (-EFAULT); /* out of memory */ } filep->private_data = tmp; /* start of string */ /* first output a headline */ sprintf(tmp, "id bus slot type irq iobase dp-mem b-chans fax-chans state device"); cp = tmp; /* start of string */ while (*cp) cp++; while (((cp - tmp) % (INFO_OUT_LEN + 1)) != INFO_OUT_LEN) *cp++ = ' '; *cp++ = '\n'; /* and now the data */ sprintf(cp, "%d %3d %4d %4d %3d 0x%04x 0x%08lx %7d %9d %3d %s", card->myid, card->bus, PCI_SLOT(card->devfn), card->brdtype, card->irq, card->iobase, card->membase, card->bchans, card->faxchans, card->state, hysdn_net_getname(card)); while (*cp) cp++; while (((cp - tmp) % (INFO_OUT_LEN + 1)) != INFO_OUT_LEN) *cp++ = ' '; *cp++ = '\n'; *cp = 0; /* end of string */ } else { /* simultaneous read/write access forbidden ! */ mutex_unlock(&hysdn_conf_mutex); return (-EPERM); /* no permission this time */ } mutex_unlock(&hysdn_conf_mutex); return nonseekable_open(ino, filep); } /* hysdn_conf_open */ /***************************/ /* close a config file. */ /***************************/ static int hysdn_conf_close(struct inode *ino, struct file *filep) { hysdn_card *card; struct conf_writedata *cnf; int retval = 0; struct proc_dir_entry *pd; mutex_lock(&hysdn_conf_mutex); /* search the addressed card */ card = card_root; while (card) { pd = card->procconf; if (pd == PDE(ino)) break; card = card->next; /* search next entry */ } if (!card) { mutex_unlock(&hysdn_conf_mutex); return (-ENODEV); /* device is unknown/invalid */ } if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL)) hysdn_addlog(card, "config close for uid=%d gid=%d mode=0x%x", filep->f_cred->fsuid, filep->f_cred->fsgid, filep->f_mode); if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) { /* write only access -> write boot file or conf line */ if (filep->private_data) { cnf = filep->private_data; if (cnf->state == CONF_STATE_POF) retval = pof_write_close(cnf->card); /* close the pof write */ kfree(filep->private_data); /* free allocated memory for buffer */ } /* handle write private data */ } else if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) { /* read access -> output card info data */ kfree(filep->private_data); /* release memory */ } mutex_unlock(&hysdn_conf_mutex); return (retval); } /* hysdn_conf_close */ /******************************************************/ /* table for conf filesystem functions defined above. */ /******************************************************/ static const struct file_operations conf_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .read = hysdn_conf_read, .write = hysdn_conf_write, .open = hysdn_conf_open, .release = hysdn_conf_close, }; /*****************************/ /* hysdn subdir in /proc/net */ /*****************************/ struct proc_dir_entry *hysdn_proc_entry = NULL; /*******************************************************************************/ /* hysdn_procconf_init is called when the module is loaded and after the cards */ /* have been detected. The needed proc dir and card config files are created. */ /* The log init is called at last. */ /*******************************************************************************/ int hysdn_procconf_init(void) { hysdn_card *card; unsigned char conf_name[20]; hysdn_proc_entry = proc_mkdir(PROC_SUBDIR_NAME, init_net.proc_net); if (!hysdn_proc_entry) { printk(KERN_ERR "HYSDN: unable to create hysdn subdir\n"); return (-1); } card = card_root; /* point to first card */ while (card) { sprintf(conf_name, "%s%d", PROC_CONF_BASENAME, card->myid); if ((card->procconf = (void *) proc_create(conf_name, S_IFREG | S_IRUGO | S_IWUSR, hysdn_proc_entry, &conf_fops)) != NULL) { hysdn_proclog_init(card); /* init the log file entry */ } card = card->next; /* next entry */ } printk(KERN_NOTICE "HYSDN: procfs initialised\n"); return (0); } /* hysdn_procconf_init */ /*************************************************************************************/ /* hysdn_procconf_release is called when the module is unloaded and before the cards */ /* resources are released. The module counter is assumed to be 0 ! */ /*************************************************************************************/ void hysdn_procconf_release(void) { hysdn_card *card; unsigned char conf_name[20]; card = card_root; /* start with first card */ while (card) { sprintf(conf_name, "%s%d", PROC_CONF_BASENAME, card->myid); if (card->procconf) remove_proc_entry(conf_name, hysdn_proc_entry); hysdn_proclog_release(card); /* init the log file entry */ card = card->next; /* point to next card */ } remove_proc_entry(PROC_SUBDIR_NAME, init_net.proc_net); }