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