| /* $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 <linux/cred.h> |
| #include <linux/module.h> |
| #include <linux/poll.h> |
| #include <linux/proc_fs.h> |
| #include <linux/pci.h> |
| #include <linux/slab.h> |
| #include <linux/mutex.h> |
| #include <net/net_namespace.h> |
| |
| #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); |
| } |