diff options
Diffstat (limited to 'drivers/isdn/hysdn/hysdn_proclog.c')
| -rw-r--r-- | drivers/isdn/hysdn/hysdn_proclog.c | 357 |
1 files changed, 357 insertions, 0 deletions
diff --git a/drivers/isdn/hysdn/hysdn_proclog.c b/drivers/isdn/hysdn/hysdn_proclog.c new file mode 100644 index 000000000..6e898b90e --- /dev/null +++ b/drivers/isdn/hysdn/hysdn_proclog.c @@ -0,0 +1,357 @@ +/* $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 */ + 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; + 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 */ + + /* delete old entrys */ + 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 */ + + spin_unlock_irqrestore(&card->hysdn_lock, flags); + + 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; + hysdn_card *card = file->private_data; + + rc = kstrtoul_from_user(buf, count, 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; + hysdn_card *card = PDE_DATA(file_inode(file)); + + if (!(inf = *((struct log_data **) file->private_data))) { + struct procdata *pd = card->proclog; + if (file->f_flags & O_NONBLOCK) + return (-EAGAIN); + + wait_event_interruptible(pd->rd_queue, (inf = + *((struct log_data **) file->private_data))); + } + if (!inf) + 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 = PDE_DATA(ino); + + mutex_lock(&hysdn_log_mutex); + if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) { + /* write only access -> write log level only */ + filep->private_data = card; /* remember our own card */ + } else if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) { + struct procdata *pd = card->proclog; + unsigned long flags; + + /* 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 */ + + 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 = PDE_DATA(file_inode(filep)); + 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 __poll_t +hysdn_log_poll(struct file *file, poll_table *wait) +{ + __poll_t mask = 0; + hysdn_card *card = PDE_DATA(file_inode(file)); + struct procdata *pd = card->proclog; + + if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) + return (mask); /* no polling for write supported */ + + poll_wait(file, &(pd->rd_queue), wait); + + if (*((struct log_data **) file->private_data)) + mask |= EPOLLIN | EPOLLRDNORM; + + 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_data(pd->log_name, + S_IFREG | S_IRUGO | S_IWUSR, hysdn_proc_entry, + &log_fops, card); + + 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 */ |