[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / isdn / hysdn / hysdn_proclog.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/pci.h>
#include <linux/smp_lock.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 void put_log_buffer(hysdn_card * card, char *cp);

/*************************************************/
/* structure keeping ascii log for device output */
/*************************************************/
struct log_data {
	struct log_data *next;
	ulong 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 */
	uchar 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 = (struct log_data *) 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 */
	save_flags(flags);
	cli();
	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 */
	restore_flags(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)
{
	ulong u = 0;
	int found = 0;
	uchar *cp, valbuf[128];
	long base = 10;
	hysdn_card *card = (hysdn_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 */
	cp = valbuf;
	if ((count > 2) && (valbuf[0] == '0') && (valbuf[1] == 'x')) {
		cp += 2;	/* pointer after hex modifier */
		base = 16;
	}
	/* scan the input for debug flags */
	while (*cp) {
		if ((*cp >= '0') && (*cp <= '9')) {
			found = 1;
			u *= base;	/* adjust to next digit */
			u += *cp++ - '0';
			continue;
		}
		if (base != 16)
			break;	/* end of number */

		if ((*cp >= 'a') && (*cp <= 'f')) {
			found = 1;
			u *= base;	/* adjust to next digit */
			u += *cp++ - 'a' + 10;
			continue;
		}
		break;		/* terminated */
	}

	if (found) {
		card->debug_flags = u;	/* remember debug flags */
		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_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;
	ulong flags;

	lock_kernel();
	card = card_root;
	while (card) {
		pd = card->proclog;
		if (pd->log == PDE(ino))
			break;
		card = card->next;	/* search next entry */
	}
	if (!card) {
		unlock_kernel();
		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 */
		save_flags(flags);
		cli();
		pd->if_used++;
		if (pd->log_head)
			filep->private_data = &pd->log_tail->next;
		else
			filep->private_data = &pd->log_head;
		restore_flags(flags);
	} else {		/* simultaneous read/write access forbidden ! */
		unlock_kernel();
		return (-EPERM);	/* no permission this time */
	}
	unlock_kernel();
	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;
	unsigned long flags;


	lock_kernel();
	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;
		save_flags(flags);
		cli();
		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;
		}
		restore_flags(flags);

		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 */
	unlock_kernel();

	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_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 struct file_operations log_fops =
{
	.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 = (struct procdata *) kmalloc(sizeof(struct procdata), GFP_KERNEL)) != NULL) {
		memset(pd, 0, sizeof(struct procdata));
		sprintf(pd->log_name, "%s%d", PROC_LOG_BASENAME, card->myid);
		if ((pd->log = create_proc_entry(pd->log_name, S_IFREG | S_IRUGO | S_IWUSR, hysdn_proc_entry)) != NULL) {
		        pd->log->proc_fops = &log_fops; 
		        pd->log->owner = THIS_MODULE;
		}

		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 */
Commit	Line	Data
1da177e4 LT	1	/* $Id: hysdn_proclog.c,v 1.9.6.3 2001/09/23 22:24:54 kai Exp $
	2	*
	3	* Linux driver for HYSDN cards, /proc/net filesystem log functions.
	4	*
	5	* Author Werner Cornelius (werner@titro.de) for Hypercope GmbH
	6	* Copyright 1999 by Werner Cornelius (werner@titro.de)
	7	*
	8	* This software may be used and distributed according to the terms
	9	* of the GNU General Public License, incorporated herein by reference.
	10	*
	11	*/
	12
	13	#include <linux/module.h>
1da177e4 LT	14	#include <linux/poll.h>
	15	#include <linux/proc_fs.h>
	16	#include <linux/pci.h>
	17	#include <linux/smp_lock.h>
	18
	19	#include "hysdn_defs.h"
	20
	21	/* the proc subdir for the interface is defined in the procconf module */
	22	extern struct proc_dir_entry *hysdn_proc_entry;
	23
aade0e82 AB	24	static void put_log_buffer(hysdn_card * card, char *cp);
aade0e82 AB	25
1da177e4 LT	26	/*************************************************/
	27	/* structure keeping ascii log for device output */
	28	/*************************************************/
	29	struct log_data {
	30	struct log_data *next;
	31	ulong usage_cnt; /* number of files still to work */
	32	void proc_ctrl; / pointer to own control procdata structure */
	33	char log_start[2]; /* log string start (final len aligned by size) */
	34	};
	35
	36	/**********************************************/
	37	/* structure holding proc entrys for one card */
	38	/**********************************************/
	39	struct procdata {
	40	struct proc_dir_entry log; / log entry */
	41	char log_name[15]; /* log filename */
	42	struct log_data log_head, log_tail; /* head and tail for queue */
	43	int if_used; /* open count for interface */
	44	int volatile del_lock; /* lock for delete operations */
	45	uchar logtmp[LOG_MAX_LINELEN];
	46	wait_queue_head_t rd_queue;
	47	};
	48
	49
	50	/**********************************************/
	51	/* log function for cards error log interface */
	52	/**********************************************/
	53	void
	54	hysdn_card_errlog(hysdn_card * card, tErrLogEntry * logp, int maxsize)
	55	{
	56	char buf[ERRLOG_TEXT_SIZE + 40];
	57
	58	sprintf(buf, "LOG 0x%08lX 0x%08lX : %s\n", logp->ulErrType, logp->ulErrSubtype, logp->ucText);
	59	put_log_buffer(card, buf); /* output the string */
	60	} /* hysdn_card_errlog */
	61
	62	/***************************************************/
	63	/* Log function using format specifiers for output */
	64	/***************************************************/
	65	void
	66	hysdn_addlog(hysdn_card * card, char *fmt,...)
	67	{
	68	struct procdata *pd = card->proclog;
	69	char *cp;
	70	va_list args;
	71
	72	if (!pd)
	73	return; /* log structure non existent */
	74
	75	cp = pd->logtmp;
	76	cp += sprintf(cp, "HYSDN: card %d ", card->myid);
	77
	78	va_start(args, fmt);
	79	cp += vsprintf(cp, fmt, args);
	80	va_end(args);
	81	*cp++ = '\n';
	82	*cp = 0;
	83
	84	if (card->debug_flags & DEB_OUT_SYSLOG)
	85	printk(KERN_INFO "%s", pd->logtmp);
	86	else
	87	put_log_buffer(card, pd->logtmp);
	88
	89	} /* hysdn_addlog */
90
91	/********************************************/
92	/* put an log buffer into the log queue. */
93	/* This buffer will be kept until all files */
94	/* opened for read got the contents. */
95	/* Flushes buffers not longer in use. */
96	/********************************************/
aade0e82	97	static void
1da177e4 LT	98	put_log_buffer(hysdn_card * card, char *cp)
	99	{
	100	struct log_data *ib;
	101	struct procdata *pd = card->proclog;
	102	int i;
	103	unsigned long flags;
	104
	105	if (!pd)
	106	return;
	107	if (!cp)
	108	return;
	109	if (!*cp)
	110	return;
	111	if (pd->if_used <= 0)
	112	return; /* no open file for read */
	113
	114	if (!(ib = (struct log_data *) kmalloc(sizeof(struct log_data) + strlen(cp), GFP_ATOMIC)))
	115	return; /* no memory */
	116	strcpy(ib->log_start, cp); /* set output string */
	117	ib->next = NULL;
	118	ib->proc_ctrl = pd; /* point to own control structure */
	119	save_flags(flags);
	120	cli();
	121	ib->usage_cnt = pd->if_used;
	122	if (!pd->log_head)
	123	pd->log_head = ib; /* new head */
	124	else
	125	pd->log_tail->next = ib; /* follows existing messages */
	126	pd->log_tail = ib; /* new tail */
	127	i = pd->del_lock++; /* get lock state */
	128	restore_flags(flags);
	129
	130	/* delete old entrys */
	131	if (!i)
	132	while (pd->log_head->next) {
	133	if ((pd->log_head->usage_cnt <= 0) &&
	134	(pd->log_head->next->usage_cnt <= 0)) {
	135	ib = pd->log_head;
	136	pd->log_head = pd->log_head->next;
	137	kfree(ib);
	138	} else
	139	break;
	140	} /* pd->log_head->next */
	141	pd->del_lock--; /* release lock level */
	142	wake_up_interruptible(&(pd->rd_queue)); /* announce new entry */
	143	} /* put_log_buffer */
	144
	145
	146	/******************************/
	147	/* file operations and tables */
	148	/******************************/
	149
	150	/****************************************/
	151	/* write log file -> set log level bits */
	152	/****************************************/
	153	static ssize_t
	154	hysdn_log_write(struct file file, const char __user buf, size_t count, loff_t * off)
	155	{
	156	ulong u = 0;
	157	int found = 0;
	158	uchar *cp, valbuf[128];
	159	long base = 10;
	160	hysdn_card card = (hysdn_card ) file->private_data;
	161
162	if (count > (sizeof(valbuf) - 1))
163	count = sizeof(valbuf) - 1; /* limit length */
164	if (copy_from_user(valbuf, buf, count))
165	return (-EFAULT); /* copy failed */
166
167	valbuf[count] = 0; /* terminating 0 */
168	cp = valbuf;
169	if ((count > 2) && (valbuf[0] == '0') && (valbuf[1] == 'x')) {
170	cp += 2; /* pointer after hex modifier */
171	base = 16;
172	}
173	/* scan the input for debug flags */
174	while (*cp) {
175	if ((cp >= '0') && (cp <= '9')) {
176	found = 1;
177	u = base; / adjust to next digit */
178	u += *cp++ - '0';
179	continue;
180	}
181	if (base != 16)
182	break; /* end of number */
183
184	if ((cp >= 'a') && (cp <= 'f')) {
185	found = 1;
186	u = base; / adjust to next digit */
187	u += *cp++ - 'a' + 10;
188	continue;
189	}
190	break; /* terminated */
191	}
192
193	if (found) {
194	card->debug_flags = u; /* remember debug flags */
195	hysdn_addlog(card, "debug set to 0x%lx", card->debug_flags);
196	}
197	return (count);
198	} /* hysdn_log_write */
199
200	/******************/
201	/* read log file */
202	/******************/
203	static ssize_t
204	hysdn_log_read(struct file file, char __user buf, size_t count, loff_t * off)
205	{
206	struct log_data *inf;
207	int len;
208	struct proc_dir_entry *pde = PDE(file->f_dentry->d_inode);
209	struct procdata *pd = NULL;
210	hysdn_card *card;
211
212	if (!((struct log_data *) file->private_data)) {
213	if (file->f_flags & O_NONBLOCK)
214	return (-EAGAIN);
215
216	/* sorry, but we need to search the card */
217	card = card_root;
218	while (card) {
219	pd = card->proclog;
220	if (pd->log == pde)
221	break;
222	card = card->next; /* search next entry */
223	}
224	if (card)
225	interruptible_sleep_on(&(pd->rd_queue));
226	else
227	return (-EAGAIN);
228
229	}
230	if (!(inf = ((struct log_data *) file->private_data)))
231	return (0);
232
233	inf->usage_cnt--; /* new usage count */
234	file->private_data = &inf->next; /* next structure */
235	if ((len = strlen(inf->log_start)) <= count) {
236	if (copy_to_user(buf, inf->log_start, len))
237	return -EFAULT;
238	*off += len;
239	return (len);
240	}
241	return (0);
242	} /* hysdn_log_read */
243
244	/******************/
245	/* open log file */
246	/******************/
247	static int
248	hysdn_log_open(struct inode ino, struct file filep)
249	{
250	hysdn_card *card;
251	struct procdata *pd = NULL;
252	ulong flags;
253
254	lock_kernel();
255	card = card_root;
256	while (card) {
257	pd = card->proclog;
258	if (pd->log == PDE(ino))
259	break;
260	card = card->next; /* search next entry */
261	}
262	if (!card) {
263	unlock_kernel();
264	return (-ENODEV); /* device is unknown/invalid */
265	}
266	filep->private_data = card; /* remember our own card */
267
268	if ((filep->f_mode & (FMODE_READ \| FMODE_WRITE)) == FMODE_WRITE) {
269	/* write only access -> write log level only */
270	} else if ((filep->f_mode & (FMODE_READ \| FMODE_WRITE)) == FMODE_READ) {
271
272	/* read access -> log/debug read */
273	save_flags(flags);
274	cli();
275	pd->if_used++;
276	if (pd->log_head)
277	filep->private_data = &pd->log_tail->next;
278	else
279	filep->private_data = &pd->log_head;
280	restore_flags(flags);
281	} else { /* simultaneous read/write access forbidden ! */
282	unlock_kernel();
283	return (-EPERM); /* no permission this time */
284	}
285	unlock_kernel();
286	return nonseekable_open(ino, filep);
287	} /* hysdn_log_open */
288
289	/*******************************************************************************/
290	/* close a cardlog file. If the file has been opened for exclusive write it is */
291	/* assumed as pof data input and the pof loader is noticed about. */
292	/* Otherwise file is handled as log output. In this case the interface usage */
293	/* count is decremented and all buffers are noticed of closing. If this file */
294	/* was the last one to be closed, all buffers are freed. */
295	/*******************************************************************************/
296	static int
297	hysdn_log_close(struct inode ino, struct file filep)
298	{
299	struct log_data *inf;
300	struct procdata *pd;
301	hysdn_card *card;
302	int retval = 0;
303	unsigned long flags;
304
305
306	lock_kernel();
307	if ((filep->f_mode & (FMODE_READ \| FMODE_WRITE)) == FMODE_WRITE) {
308	/* write only access -> write debug level written */
309	retval = 0; /* success */
310	} else {
311	/* read access -> log/debug read, mark one further file as closed */
312
313	pd = NULL;
314	save_flags(flags);
315	cli();
316	inf = ((struct log_data ) filep->private_data); / get first log entry */
317	if (inf)
318	pd = (struct procdata ) inf->proc_ctrl; / still entries there */
319	else {
320	/* no info available -> search card */
321	card = card_root;
322	while (card) {
323	pd = card->proclog;
324	if (pd->log == PDE(ino))
325	break;
326	card = card->next; /* search next entry */
327	}
328	if (card)
329	pd = card->proclog; /* pointer to procfs log */
330	}
331	if (pd)
332	pd->if_used--; /* decrement interface usage count by one */
333
334	while (inf) {
335	inf->usage_cnt--; /* decrement usage count for buffers */
336	inf = inf->next;
337	}
338	restore_flags(flags);
339
340	if (pd)
341	if (pd->if_used <= 0) /* delete buffers if last file closed */
342	while (pd->log_head) {
343	inf = pd->log_head;
344	pd->log_head = pd->log_head->next;
345	kfree(inf);
346	}
347	} /* read access */
348	unlock_kernel();
349
350	return (retval);
351	} /* hysdn_log_close */
352
353	/*************************************************/
354	/* select/poll routine to be able using select() */
355	/*************************************************/
356	static unsigned int
357	hysdn_log_poll(struct file file, poll_table wait)
358	{
359	unsigned int mask = 0;
360	struct proc_dir_entry *pde = PDE(file->f_dentry->d_inode);
361	hysdn_card *card;
362	struct procdata *pd = NULL;
363
364	if ((file->f_mode & (FMODE_READ \| FMODE_WRITE)) == FMODE_WRITE)
365	return (mask); /* no polling for write supported */
366
367	/* we need to search the card */
368	card = card_root;
369	while (card) {
370	pd = card->proclog;
371	if (pd->log == pde)
372	break;
373	card = card->next; /* search next entry */
374	}
375	if (!card)
376	return (mask); /* card not found */
377
378	poll_wait(file, &(pd->rd_queue), wait);
379
380	if (((struct log_data *) file->private_data))
381	mask \|= POLLIN \| POLLRDNORM;
382
383	return mask;
384	} /* hysdn_log_poll */
385
386	/**************************************************/
387	/* table for log filesystem functions defined above. */
388	/**************************************************/
389	static struct file_operations log_fops =
390	{
391	.llseek = no_llseek,
392	.read = hysdn_log_read,
393	.write = hysdn_log_write,
394	.poll = hysdn_log_poll,
395	.open = hysdn_log_open,
396	.release = hysdn_log_close,
397	};
398
399
400	/***********************************************************************************/
401	/* hysdn_proclog_init is called when the module is loaded after creating the cards */
402	/* conf files. */
403	/***********************************************************************************/
404	int
405	hysdn_proclog_init(hysdn_card * card)
406	{
407	struct procdata *pd;
408
409	/* create a cardlog proc entry */
410
411	if ((pd = (struct procdata *) kmalloc(sizeof(struct procdata), GFP_KERNEL)) != NULL) {
412	memset(pd, 0, sizeof(struct procdata));
413	sprintf(pd->log_name, "%s%d", PROC_LOG_BASENAME, card->myid);
414	if ((pd->log = create_proc_entry(pd->log_name, S_IFREG \| S_IRUGO \| S_IWUSR, hysdn_proc_entry)) != NULL) {
415	pd->log->proc_fops = &log_fops;
416	pd->log->owner = THIS_MODULE;
417	}
418
419	init_waitqueue_head(&(pd->rd_queue));
420
421	card->proclog = (void ) pd; / remember procfs structure */
422	}
423	return (0);
424	} /* hysdn_proclog_init */
425
426	/************************************************************************************/
427	/* hysdn_proclog_release is called when the module is unloaded and before the cards */
428	/* conf file is released */
429	/* The module counter is assumed to be 0 ! */
430	/************************************************************************************/
431	void
432	hysdn_proclog_release(hysdn_card * card)
433	{
434	struct procdata *pd;
435
436	if ((pd = (struct procdata *) card->proclog) != NULL) {
437	if (pd->log)
438	remove_proc_entry(pd->log_name, hysdn_proc_entry);
439	kfree(pd); /* release memory */
440	card->proclog = NULL;
441	}
442	} /* hysdn_proclog_release */