hysdn_procconf.c
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上传日期:2013-04-10
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文件大小:14k
源码类别:
Linux/Unix编程
开发平台:
Unix_Linux
- /* $Id: hysdn_procconf.c,v 1.1.4.1 2001/11/20 14:19:37 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.
- *
- */
- #define __NO_VERSION__
- #include <linux/module.h>
- #include <linux/version.h>
- #include <linux/poll.h>
- #include <linux/proc_fs.h>
- #include <linux/pci.h>
- #include <linux/smp_lock.h>
- #include "hysdn_defs.h"
- static char *hysdn_procconf_revision = "$Revision: 1.1.4.1 $";
- #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 */
- uchar conf_line[CONF_LINE_LEN]; /* buffered conf line */
- word channel; /* active channel number */
- uchar *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)
- {
- uchar *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 *buf, size_t count, loff_t * off)
- {
- struct conf_writedata *cnf;
- int i;
- uchar ch, *cp;
- if (&file->f_pos != off) /* fs error check */
- return (-ESPIPE);
- 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 *buf, size_t count, loff_t * off)
- {
- char *cp;
- int i;
- if (off != &file->f_pos) /* fs error check */
- return -ESPIPE;
- if (file->f_mode & FMODE_READ) {
- if (!(cp = file->private_data))
- return (-EFAULT); /* should never happen */
- i = strlen(cp); /* get total string length */
- if (*off < i) {
- /* still bytes to transfer */
- cp += *off; /* point to desired data offset */
- i -= *off; /* remaining length */
- if (i > count)
- i = count; /* limit length to transfer */
- if (copy_to_user(buf, cp, i))
- return (-EFAULT); /* copy error */
- *off += i; /* adjust offset */
- } else
- return (0);
- } else
- return (-EPERM); /* no permission to read */
- return (i);
- } /* 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 */
- lock_kernel();
- card = card_root;
- while (card) {
- pd = card->procconf;
- if (pd->low_ino == (ino->i_ino & 0xFFFF))
- break;
- card = card->next; /* search next entry */
- }
- if (!card) {
- unlock_kernel();
- 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_uid, filep->f_gid, 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))) {
- unlock_kernel();
- 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 = (char *) kmalloc(INFO_OUT_LEN * 2 + 2, GFP_KERNEL))) {
- unlock_kernel();
- 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 ! */
- unlock_kernel();
- return (-EPERM); /* no permission this time */
- }
- unlock_kernel();
- return (0);
- } /* 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;
- lock_kernel();
- /* search the addressed card */
- card = card_root;
- while (card) {
- pd = card->procconf;
- if (pd->low_ino == (ino->i_ino & 0xFFFF))
- break;
- card = card->next; /* search next entry */
- }
- if (!card) {
- unlock_kernel();
- 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_uid, filep->f_gid, 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 */
- if (filep->private_data)
- kfree(filep->private_data); /* release memory */
- }
- unlock_kernel();
- return (retval);
- } /* hysdn_conf_close */
- /******************************************************/
- /* table for conf filesystem functions defined above. */
- /******************************************************/
- static struct file_operations conf_fops =
- {
- 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;
- uchar conf_name[20];
- hysdn_proc_entry = create_proc_entry(PROC_SUBDIR_NAME, S_IFDIR | S_IRUGO | S_IXUGO, proc_net);
- if (!hysdn_proc_entry) {
- printk(KERN_ERR "HYSDN: unable to create hysdn subdirn");
- 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 *) create_proc_entry(conf_name,
- S_IFREG | S_IRUGO | S_IWUSR,
- hysdn_proc_entry)) != NULL) {
- ((struct proc_dir_entry *) card->procconf)->proc_fops = &conf_fops;
- ((struct proc_dir_entry *) card->procconf)->owner = THIS_MODULE;
- hysdn_proclog_init(card); /* init the log file entry */
- }
- card = card->next; /* next entry */
- }
- printk(KERN_NOTICE "HYSDN: procfs Rev. %s initialisedn", hysdn_getrev(hysdn_procconf_revision));
- 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;
- uchar 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, proc_net);
- }