412 lines
12 KiB
C
412 lines
12 KiB
C
/* $Id: hysdn_proclog.c,v 1.9.6.3 2001/09/23 22:24:54 kai Exp $
|
|
*
|
|
* Linux driver for HYSDN cards, /proc/net filesystem log functions.
|
|
*
|
|
* Author 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/module.h>
|
|
#include <linux/poll.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#include "hysdn_defs.h"
|
|
|
|
/* the proc subdir for the interface is defined in the procconf module */
|
|
extern struct proc_dir_entry *hysdn_proc_entry;
|
|
|
|
static DEFINE_MUTEX(hysdn_log_mutex);
|
|
static void put_log_buffer(hysdn_card * card, char *cp);
|
|
|
|
/*************************************************/
|
|
/* structure keeping ascii log for device output */
|
|
/*************************************************/
|
|
struct log_data {
|
|
struct log_data *next;
|
|
unsigned long usage_cnt;/* number of files still to work */
|
|
void *proc_ctrl; /* pointer to own control procdata structure */
|
|
char log_start[2]; /* log string start (final len aligned by size) */
|
|
};
|
|
|
|
/**********************************************/
|
|
/* structure holding proc entrys for one card */
|
|
/**********************************************/
|
|
struct procdata {
|
|
struct proc_dir_entry *log; /* log entry */
|
|
char log_name[15]; /* log filename */
|
|
struct log_data *log_head, *log_tail; /* head and tail for queue */
|
|
int if_used; /* open count for interface */
|
|
int volatile del_lock; /* lock for delete operations */
|
|
unsigned char logtmp[LOG_MAX_LINELEN];
|
|
wait_queue_head_t rd_queue;
|
|
};
|
|
|
|
|
|
/**********************************************/
|
|
/* log function for cards error log interface */
|
|
/**********************************************/
|
|
void
|
|
hysdn_card_errlog(hysdn_card * card, tErrLogEntry * logp, int maxsize)
|
|
{
|
|
char buf[ERRLOG_TEXT_SIZE + 40];
|
|
|
|
sprintf(buf, "LOG 0x%08lX 0x%08lX : %s\n", logp->ulErrType, logp->ulErrSubtype, logp->ucText);
|
|
put_log_buffer(card, buf); /* output the string */
|
|
} /* hysdn_card_errlog */
|
|
|
|
/***************************************************/
|
|
/* Log function using format specifiers for output */
|
|
/***************************************************/
|
|
void
|
|
hysdn_addlog(hysdn_card * card, char *fmt,...)
|
|
{
|
|
struct procdata *pd = card->proclog;
|
|
char *cp;
|
|
va_list args;
|
|
|
|
if (!pd)
|
|
return; /* log structure non existent */
|
|
|
|
cp = pd->logtmp;
|
|
cp += sprintf(cp, "HYSDN: card %d ", card->myid);
|
|
|
|
va_start(args, fmt);
|
|
cp += vsprintf(cp, fmt, args);
|
|
va_end(args);
|
|
*cp++ = '\n';
|
|
*cp = 0;
|
|
|
|
if (card->debug_flags & DEB_OUT_SYSLOG)
|
|
printk(KERN_INFO "%s", pd->logtmp);
|
|
else
|
|
put_log_buffer(card, pd->logtmp);
|
|
|
|
} /* hysdn_addlog */
|
|
|
|
/********************************************/
|
|
/* put an log buffer into the log queue. */
|
|
/* This buffer will be kept until all files */
|
|
/* opened for read got the contents. */
|
|
/* Flushes buffers not longer in use. */
|
|
/********************************************/
|
|
static void
|
|
put_log_buffer(hysdn_card * card, char *cp)
|
|
{
|
|
struct log_data *ib;
|
|
struct procdata *pd = card->proclog;
|
|
int i;
|
|
unsigned long flags;
|
|
|
|
if (!pd)
|
|
return;
|
|
if (!cp)
|
|
return;
|
|
if (!*cp)
|
|
return;
|
|
if (pd->if_used <= 0)
|
|
return; /* no open file for read */
|
|
|
|
if (!(ib = kmalloc(sizeof(struct log_data) + strlen(cp), GFP_ATOMIC)))
|
|
return; /* no memory */
|
|
strcpy(ib->log_start, cp); /* set output string */
|
|
ib->next = NULL;
|
|
ib->proc_ctrl = pd; /* point to own control structure */
|
|
spin_lock_irqsave(&card->hysdn_lock, flags);
|
|
ib->usage_cnt = pd->if_used;
|
|
if (!pd->log_head)
|
|
pd->log_head = ib; /* new head */
|
|
else
|
|
pd->log_tail->next = ib; /* follows existing messages */
|
|
pd->log_tail = ib; /* new tail */
|
|
i = pd->del_lock++; /* get lock state */
|
|
spin_unlock_irqrestore(&card->hysdn_lock, flags);
|
|
|
|
/* delete old entrys */
|
|
if (!i)
|
|
while (pd->log_head->next) {
|
|
if ((pd->log_head->usage_cnt <= 0) &&
|
|
(pd->log_head->next->usage_cnt <= 0)) {
|
|
ib = pd->log_head;
|
|
pd->log_head = pd->log_head->next;
|
|
kfree(ib);
|
|
} else
|
|
break;
|
|
} /* pd->log_head->next */
|
|
pd->del_lock--; /* release lock level */
|
|
wake_up_interruptible(&(pd->rd_queue)); /* announce new entry */
|
|
} /* put_log_buffer */
|
|
|
|
|
|
/******************************/
|
|
/* file operations and tables */
|
|
/******************************/
|
|
|
|
/****************************************/
|
|
/* write log file -> set log level bits */
|
|
/****************************************/
|
|
static ssize_t
|
|
hysdn_log_write(struct file *file, const char __user *buf, size_t count, loff_t * off)
|
|
{
|
|
int rc;
|
|
unsigned char valbuf[128];
|
|
hysdn_card *card = file->private_data;
|
|
|
|
if (count > (sizeof(valbuf) - 1))
|
|
count = sizeof(valbuf) - 1; /* limit length */
|
|
if (copy_from_user(valbuf, buf, count))
|
|
return (-EFAULT); /* copy failed */
|
|
|
|
valbuf[count] = 0; /* terminating 0 */
|
|
|
|
rc = kstrtoul(valbuf, 0, &card->debug_flags);
|
|
if (rc < 0)
|
|
return rc;
|
|
hysdn_addlog(card, "debug set to 0x%lx", card->debug_flags);
|
|
return (count);
|
|
} /* hysdn_log_write */
|
|
|
|
/******************/
|
|
/* read log file */
|
|
/******************/
|
|
static ssize_t
|
|
hysdn_log_read(struct file *file, char __user *buf, size_t count, loff_t * off)
|
|
{
|
|
struct log_data *inf;
|
|
int len;
|
|
struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
|
|
struct procdata *pd = NULL;
|
|
hysdn_card *card;
|
|
|
|
if (!*((struct log_data **) file->private_data)) {
|
|
if (file->f_flags & O_NONBLOCK)
|
|
return (-EAGAIN);
|
|
|
|
/* sorry, but we need to search the card */
|
|
card = card_root;
|
|
while (card) {
|
|
pd = card->proclog;
|
|
if (pd->log == pde)
|
|
break;
|
|
card = card->next; /* search next entry */
|
|
}
|
|
if (card)
|
|
interruptible_sleep_on(&(pd->rd_queue));
|
|
else
|
|
return (-EAGAIN);
|
|
|
|
}
|
|
if (!(inf = *((struct log_data **) file->private_data)))
|
|
return (0);
|
|
|
|
inf->usage_cnt--; /* new usage count */
|
|
file->private_data = &inf->next; /* next structure */
|
|
if ((len = strlen(inf->log_start)) <= count) {
|
|
if (copy_to_user(buf, inf->log_start, len))
|
|
return -EFAULT;
|
|
*off += len;
|
|
return (len);
|
|
}
|
|
return (0);
|
|
} /* hysdn_log_read */
|
|
|
|
/******************/
|
|
/* open log file */
|
|
/******************/
|
|
static int
|
|
hysdn_log_open(struct inode *ino, struct file *filep)
|
|
{
|
|
hysdn_card *card;
|
|
struct procdata *pd = NULL;
|
|
unsigned long flags;
|
|
|
|
mutex_lock(&hysdn_log_mutex);
|
|
card = card_root;
|
|
while (card) {
|
|
pd = card->proclog;
|
|
if (pd->log == PDE(ino))
|
|
break;
|
|
card = card->next; /* search next entry */
|
|
}
|
|
if (!card) {
|
|
mutex_unlock(&hysdn_log_mutex);
|
|
return (-ENODEV); /* device is unknown/invalid */
|
|
}
|
|
filep->private_data = card; /* remember our own card */
|
|
|
|
if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) {
|
|
/* write only access -> write log level only */
|
|
} else if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
|
|
|
|
/* read access -> log/debug read */
|
|
spin_lock_irqsave(&card->hysdn_lock, flags);
|
|
pd->if_used++;
|
|
if (pd->log_head)
|
|
filep->private_data = &pd->log_tail->next;
|
|
else
|
|
filep->private_data = &pd->log_head;
|
|
spin_unlock_irqrestore(&card->hysdn_lock, flags);
|
|
} else { /* simultaneous read/write access forbidden ! */
|
|
mutex_unlock(&hysdn_log_mutex);
|
|
return (-EPERM); /* no permission this time */
|
|
}
|
|
mutex_unlock(&hysdn_log_mutex);
|
|
return nonseekable_open(ino, filep);
|
|
} /* hysdn_log_open */
|
|
|
|
/*******************************************************************************/
|
|
/* close a cardlog file. If the file has been opened for exclusive write it is */
|
|
/* assumed as pof data input and the pof loader is noticed about. */
|
|
/* Otherwise file is handled as log output. In this case the interface usage */
|
|
/* count is decremented and all buffers are noticed of closing. If this file */
|
|
/* was the last one to be closed, all buffers are freed. */
|
|
/*******************************************************************************/
|
|
static int
|
|
hysdn_log_close(struct inode *ino, struct file *filep)
|
|
{
|
|
struct log_data *inf;
|
|
struct procdata *pd;
|
|
hysdn_card *card;
|
|
int retval = 0;
|
|
|
|
mutex_lock(&hysdn_log_mutex);
|
|
if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) {
|
|
/* write only access -> write debug level written */
|
|
retval = 0; /* success */
|
|
} else {
|
|
/* read access -> log/debug read, mark one further file as closed */
|
|
|
|
pd = NULL;
|
|
inf = *((struct log_data **) filep->private_data); /* get first log entry */
|
|
if (inf)
|
|
pd = (struct procdata *) inf->proc_ctrl; /* still entries there */
|
|
else {
|
|
/* no info available -> search card */
|
|
card = card_root;
|
|
while (card) {
|
|
pd = card->proclog;
|
|
if (pd->log == PDE(ino))
|
|
break;
|
|
card = card->next; /* search next entry */
|
|
}
|
|
if (card)
|
|
pd = card->proclog; /* pointer to procfs log */
|
|
}
|
|
if (pd)
|
|
pd->if_used--; /* decrement interface usage count by one */
|
|
|
|
while (inf) {
|
|
inf->usage_cnt--; /* decrement usage count for buffers */
|
|
inf = inf->next;
|
|
}
|
|
|
|
if (pd)
|
|
if (pd->if_used <= 0) /* delete buffers if last file closed */
|
|
while (pd->log_head) {
|
|
inf = pd->log_head;
|
|
pd->log_head = pd->log_head->next;
|
|
kfree(inf);
|
|
}
|
|
} /* read access */
|
|
mutex_unlock(&hysdn_log_mutex);
|
|
|
|
return (retval);
|
|
} /* hysdn_log_close */
|
|
|
|
/*************************************************/
|
|
/* select/poll routine to be able using select() */
|
|
/*************************************************/
|
|
static unsigned int
|
|
hysdn_log_poll(struct file *file, poll_table * wait)
|
|
{
|
|
unsigned int mask = 0;
|
|
struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
|
|
hysdn_card *card;
|
|
struct procdata *pd = NULL;
|
|
|
|
if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE)
|
|
return (mask); /* no polling for write supported */
|
|
|
|
/* we need to search the card */
|
|
card = card_root;
|
|
while (card) {
|
|
pd = card->proclog;
|
|
if (pd->log == pde)
|
|
break;
|
|
card = card->next; /* search next entry */
|
|
}
|
|
if (!card)
|
|
return (mask); /* card not found */
|
|
|
|
poll_wait(file, &(pd->rd_queue), wait);
|
|
|
|
if (*((struct log_data **) file->private_data))
|
|
mask |= POLLIN | POLLRDNORM;
|
|
|
|
return mask;
|
|
} /* hysdn_log_poll */
|
|
|
|
/**************************************************/
|
|
/* table for log filesystem functions defined above. */
|
|
/**************************************************/
|
|
static const struct file_operations log_fops =
|
|
{
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.read = hysdn_log_read,
|
|
.write = hysdn_log_write,
|
|
.poll = hysdn_log_poll,
|
|
.open = hysdn_log_open,
|
|
.release = hysdn_log_close,
|
|
};
|
|
|
|
|
|
/***********************************************************************************/
|
|
/* hysdn_proclog_init is called when the module is loaded after creating the cards */
|
|
/* conf files. */
|
|
/***********************************************************************************/
|
|
int
|
|
hysdn_proclog_init(hysdn_card * card)
|
|
{
|
|
struct procdata *pd;
|
|
|
|
/* create a cardlog proc entry */
|
|
|
|
if ((pd = kzalloc(sizeof(struct procdata), GFP_KERNEL)) != NULL) {
|
|
sprintf(pd->log_name, "%s%d", PROC_LOG_BASENAME, card->myid);
|
|
pd->log = proc_create(pd->log_name,
|
|
S_IFREG | S_IRUGO | S_IWUSR, hysdn_proc_entry,
|
|
&log_fops);
|
|
|
|
init_waitqueue_head(&(pd->rd_queue));
|
|
|
|
card->proclog = (void *) pd; /* remember procfs structure */
|
|
}
|
|
return (0);
|
|
} /* hysdn_proclog_init */
|
|
|
|
/************************************************************************************/
|
|
/* hysdn_proclog_release is called when the module is unloaded and before the cards */
|
|
/* conf file is released */
|
|
/* The module counter is assumed to be 0 ! */
|
|
/************************************************************************************/
|
|
void
|
|
hysdn_proclog_release(hysdn_card * card)
|
|
{
|
|
struct procdata *pd;
|
|
|
|
if ((pd = (struct procdata *) card->proclog) != NULL) {
|
|
if (pd->log)
|
|
remove_proc_entry(pd->log_name, hysdn_proc_entry);
|
|
kfree(pd); /* release memory */
|
|
card->proclog = NULL;
|
|
}
|
|
} /* hysdn_proclog_release */
|