--- /dev/null
+/* $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 conf_writedata *cnf;
+ char *cp, *tmp;
+
+ /* now search the addressed card */
+ mutex_lock(&hysdn_conf_mutex);
+ card = PDE_DATA(ino);
+ 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;
+
+ mutex_lock(&hysdn_conf_mutex);
+ card = PDE_DATA(ino);
+ 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_data(conf_name,
+ S_IFREG | S_IRUGO | S_IWUSR,
+ hysdn_proc_entry,
+ &conf_fops,
+ card)) != 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);
+}
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