[GitHub/MotorolaMobilityLLC/kernel-slsi.git] / drivers / isdn / divert / divert_procfs.c

/* $Id: divert_procfs.c,v 1.11.6.2 2001/09/23 22:24:36 kai Exp $
 *
 * Filesystem handling for the diversion supplementary services.
 *
 * Copyright 1998       by Werner Cornelius (werner@isdn4linux.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>
#ifdef CONFIG_PROC_FS
#include <linux/proc_fs.h>
#else
#include <linux/fs.h>
#endif
#include <linux/isdnif.h>
#include "isdn_divert.h"


/*********************************/
/* Variables for interface queue */
/*********************************/
ulong if_used = 0;		/* number of interface users */
static struct divert_info *divert_info_head = NULL;	/* head of queue */
static struct divert_info *divert_info_tail = NULL;	/* pointer to last entry */
static DEFINE_SPINLOCK(divert_info_lock);/* lock for queue */
static wait_queue_head_t rd_queue;

/*********************************/
/* put an info buffer into queue */
/*********************************/
void
put_info_buffer(char *cp)
{
	struct divert_info *ib;
	unsigned long flags;

	if (if_used <= 0)
		return;
	if (!cp)
		return;
	if (!*cp)
		return;
	if (!(ib = kmalloc(sizeof(struct divert_info) + strlen(cp), GFP_ATOMIC)))
		 return;	/* no memory */
	strcpy(ib->info_start, cp);	/* set output string */
	ib->next = NULL;
	spin_lock_irqsave( &divert_info_lock, flags );
	ib->usage_cnt = if_used;
	if (!divert_info_head)
		divert_info_head = ib;	/* new head */
	else
		divert_info_tail->next = ib;	/* follows existing messages */
	divert_info_tail = ib;	/* new tail */

	/* delete old entrys */
	while (divert_info_head->next) {
		if ((divert_info_head->usage_cnt <= 0) &&
		    (divert_info_head->next->usage_cnt <= 0)) {
			ib = divert_info_head;
			divert_info_head = divert_info_head->next;
			kfree(ib);
		} else
			break;
	}			/* divert_info_head->next */
	spin_unlock_irqrestore( &divert_info_lock, flags );
	wake_up_interruptible(&(rd_queue));
}				/* put_info_buffer */

/**********************************/
/* deflection device read routine */
/**********************************/
static ssize_t
isdn_divert_read(struct file *file, char __user *buf, size_t count, loff_t * off)
{
	struct divert_info *inf;
	int len;

	if (!*((struct divert_info **) file->private_data)) {
		if (file->f_flags & O_NONBLOCK)
			return -EAGAIN;
		interruptible_sleep_on(&(rd_queue));
	}
	if (!(inf = *((struct divert_info **) file->private_data)))
		return (0);

	inf->usage_cnt--;	/* new usage count */
	file->private_data = &inf->next;	/* next structure */
	if ((len = strlen(inf->info_start)) <= count) {
		if (copy_to_user(buf, inf->info_start, len))
			return -EFAULT;
		*off += len;
		return (len);
	}
	return (0);
}				/* isdn_divert_read */

/**********************************/
/* deflection device write routine */
/**********************************/
static ssize_t
isdn_divert_write(struct file *file, const char __user *buf, size_t count, loff_t * off)
{
	return (-ENODEV);
}				/* isdn_divert_write */


/***************************************/
/* select routines for various kernels */
/***************************************/
static unsigned int
isdn_divert_poll(struct file *file, poll_table * wait)
{
	unsigned int mask = 0;

	poll_wait(file, &(rd_queue), wait);
	/* mask = POLLOUT | POLLWRNORM; */
	if (*((struct divert_info **) file->private_data)) {
		mask |= POLLIN | POLLRDNORM;
	}
	return mask;
}				/* isdn_divert_poll */

/****************/
/* Open routine */
/****************/
static int
isdn_divert_open(struct inode *ino, struct file *filep)
{
	unsigned long flags;

	spin_lock_irqsave( &divert_info_lock, flags );
 	if_used++;
	if (divert_info_head)
		filep->private_data = &(divert_info_tail->next);
	else
		filep->private_data = &divert_info_head;
	spin_unlock_irqrestore( &divert_info_lock, flags );
	/*  start_divert(); */
	return nonseekable_open(ino, filep);
}				/* isdn_divert_open */

/*******************/
/* close routine   */
/*******************/
static int
isdn_divert_close(struct inode *ino, struct file *filep)
{
	struct divert_info *inf;
	unsigned long flags;

	spin_lock_irqsave( &divert_info_lock, flags );
	if_used--;
	inf = *((struct divert_info **) filep->private_data);
	while (inf) {
		inf->usage_cnt--;
		inf = inf->next;
	}
	if (if_used <= 0)
		while (divert_info_head) {
			inf = divert_info_head;
			divert_info_head = divert_info_head->next;
			kfree(inf);
		}
	spin_unlock_irqrestore( &divert_info_lock, flags );
	return (0);
}				/* isdn_divert_close */

/*********/
/* IOCTL */
/*********/
static int
isdn_divert_ioctl(struct inode *inode, struct file *file,
		  uint cmd, ulong arg)
{
	divert_ioctl dioctl;
	int i;
	unsigned long flags;
	divert_rule *rulep;
	char *cp;

	if (copy_from_user(&dioctl, (void __user *) arg, sizeof(dioctl)))
		return -EFAULT;

	switch (cmd) {
		case IIOCGETVER:
			dioctl.drv_version = DIVERT_IIOC_VERSION;	/* set version */
			break;

		case IIOCGETDRV:
			if ((dioctl.getid.drvid = divert_if.name_to_drv(dioctl.getid.drvnam)) < 0)
				return (-EINVAL);
			break;

		case IIOCGETNAM:
			cp = divert_if.drv_to_name(dioctl.getid.drvid);
			if (!cp)
				return (-EINVAL);
			if (!*cp)
				return (-EINVAL);
			strcpy(dioctl.getid.drvnam, cp);
			break;

		case IIOCGETRULE:
			if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
				return (-EINVAL);
			dioctl.getsetrule.rule = *rulep;	/* copy data */
			break;

		case IIOCMODRULE:
			if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
				return (-EINVAL);
            spin_lock_irqsave(&divert_lock, flags);
			*rulep = dioctl.getsetrule.rule;	/* copy data */
			spin_unlock_irqrestore(&divert_lock, flags);
			return (0);	/* no copy required */
			break;

		case IIOCINSRULE:
			return (insertrule(dioctl.getsetrule.ruleidx, &dioctl.getsetrule.rule));
			break;

		case IIOCDELRULE:
			return (deleterule(dioctl.getsetrule.ruleidx));
			break;

		case IIOCDODFACT:
			return (deflect_extern_action(dioctl.fwd_ctrl.subcmd,
						  dioctl.fwd_ctrl.callid,
						 dioctl.fwd_ctrl.to_nr));

		case IIOCDOCFACT:
		case IIOCDOCFDIS:
		case IIOCDOCFINT:
			if (!divert_if.drv_to_name(dioctl.cf_ctrl.drvid))
				return (-EINVAL);	/* invalid driver */
			if ((i = cf_command(dioctl.cf_ctrl.drvid,
					    (cmd == IIOCDOCFACT) ? 1 : (cmd == IIOCDOCFDIS) ? 0 : 2,
					    dioctl.cf_ctrl.cfproc,
					    dioctl.cf_ctrl.msn,
					    dioctl.cf_ctrl.service,
					    dioctl.cf_ctrl.fwd_nr,
					    &dioctl.cf_ctrl.procid)))
				return (i);
			break;

		default:
			return (-EINVAL);
	}			/* switch cmd */
	return copy_to_user((void __user *)arg, &dioctl, sizeof(dioctl)) ? -EFAULT : 0;
}				/* isdn_divert_ioctl */


#ifdef CONFIG_PROC_FS
static const struct file_operations isdn_fops =
{
	.owner          = THIS_MODULE,
	.llseek         = no_llseek,
	.read           = isdn_divert_read,
	.write          = isdn_divert_write,
	.poll           = isdn_divert_poll,
	.ioctl          = isdn_divert_ioctl,
	.open           = isdn_divert_open,
	.release        = isdn_divert_close,                                      
};

/****************************/
/* isdn subdir in /proc/net */
/****************************/
static struct proc_dir_entry *isdn_proc_entry = NULL;
static struct proc_dir_entry *isdn_divert_entry = NULL;
#endif	/* CONFIG_PROC_FS */

/***************************************************************************/
/* divert_dev_init must be called before the proc filesystem may be used   */
/***************************************************************************/
int
divert_dev_init(void)
{

	init_waitqueue_head(&rd_queue);

#ifdef CONFIG_PROC_FS
	isdn_proc_entry = proc_mkdir("net/isdn", NULL);
	if (!isdn_proc_entry)
		return (-1);
	isdn_divert_entry = create_proc_entry("divert", S_IFREG | S_IRUGO, isdn_proc_entry);
	if (!isdn_divert_entry) {
		remove_proc_entry("net/isdn", NULL);
		return (-1);
	}
	isdn_divert_entry->proc_fops = &isdn_fops; 
	isdn_divert_entry->owner = THIS_MODULE; 
#endif	/* CONFIG_PROC_FS */

	return (0);
}				/* divert_dev_init */

/***************************************************************************/
/* divert_dev_deinit must be called before leaving isdn when included as   */
/* a module.                                                               */
/***************************************************************************/
int
divert_dev_deinit(void)
{

#ifdef CONFIG_PROC_FS
	remove_proc_entry("divert", isdn_proc_entry);
	remove_proc_entry("net/isdn", NULL);
#endif	/* CONFIG_PROC_FS */

	return (0);
}				/* divert_dev_deinit */
Commit	Line	Data
1da177e4 LT	1	/* $Id: divert_procfs.c,v 1.11.6.2 2001/09/23 22:24:36 kai Exp $
	2	*
	3	* Filesystem handling for the diversion supplementary services.
	4	*
	5	* Copyright 1998 by Werner Cornelius (werner@isdn4linux.de)
	6	*
	7	* This software may be used and distributed according to the terms
	8	* of the GNU General Public License, incorporated herein by reference.
	9	*
	10	*/
	11
1da177e4	12	#include <linux/module.h>
1da177e4	13	#include <linux/poll.h>
1da177e4 LT	14	#ifdef CONFIG_PROC_FS
	15	#include <linux/proc_fs.h>
	16	#else
	17	#include <linux/fs.h>
	18	#endif
	19	#include <linux/isdnif.h>
	20	#include "isdn_divert.h"
	21
	22
	23	/*********************************/
	24	/* Variables for interface queue */
	25	/*********************************/
	26	ulong if_used = 0; /* number of interface users */
	27	static struct divert_info divert_info_head = NULL; / head of queue */
	28	static struct divert_info divert_info_tail = NULL; / pointer to last entry */
	29	static DEFINE_SPINLOCK(divert_info_lock);/* lock for queue */
	30	static wait_queue_head_t rd_queue;
	31
	32	/*********************************/
	33	/* put an info buffer into queue */
	34	/*********************************/
	35	void
	36	put_info_buffer(char *cp)
	37	{
	38	struct divert_info *ib;
	39	unsigned long flags;
	40
	41	if (if_used <= 0)
	42	return;
	43	if (!cp)
	44	return;
	45	if (!*cp)
	46	return;
5cbded58	47	if (!(ib = kmalloc(sizeof(struct divert_info) + strlen(cp), GFP_ATOMIC)))
1da177e4 LT	48	return; /* no memory */
	49	strcpy(ib->info_start, cp); /* set output string */
	50	ib->next = NULL;
	51	spin_lock_irqsave( &divert_info_lock, flags );
	52	ib->usage_cnt = if_used;
	53	if (!divert_info_head)
	54	divert_info_head = ib; /* new head */
	55	else
	56	divert_info_tail->next = ib; /* follows existing messages */
	57	divert_info_tail = ib; /* new tail */
	58
	59	/* delete old entrys */
	60	while (divert_info_head->next) {
	61	if ((divert_info_head->usage_cnt <= 0) &&
	62	(divert_info_head->next->usage_cnt <= 0)) {
	63	ib = divert_info_head;
	64	divert_info_head = divert_info_head->next;
	65	kfree(ib);
	66	} else
	67	break;
	68	} /* divert_info_head->next */
	69	spin_unlock_irqrestore( &divert_info_lock, flags );
	70	wake_up_interruptible(&(rd_queue));
	71	} /* put_info_buffer */
	72
	73	/**********************************/
	74	/* deflection device read routine */
	75	/**********************************/
	76	static ssize_t
	77	isdn_divert_read(struct file file, char __user buf, size_t count, loff_t * off)
	78	{
	79	struct divert_info *inf;
	80	int len;
	81
	82	if (!((struct divert_info *) file->private_data)) {
	83	if (file->f_flags & O_NONBLOCK)
	84	return -EAGAIN;
	85	interruptible_sleep_on(&(rd_queue));
	86	}
	87	if (!(inf = ((struct divert_info *) file->private_data)))
	88	return (0);
	89
	90	inf->usage_cnt--; /* new usage count */
	91	file->private_data = &inf->next; /* next structure */
	92	if ((len = strlen(inf->info_start)) <= count) {
	93	if (copy_to_user(buf, inf->info_start, len))
	94	return -EFAULT;
	95	*off += len;
	96	return (len);
	97	}
	98	return (0);
	99	} /* isdn_divert_read */
	100
	101	/**********************************/
	102	/* deflection device write routine */
	103	/**********************************/
	104	static ssize_t
	105	isdn_divert_write(struct file file, const char __user buf, size_t count, loff_t * off)
	106	{
	107	return (-ENODEV);
	108	} /* isdn_divert_write */
	109
	110
	111	/***************************************/
112	/* select routines for various kernels */
113	/***************************************/
114	static unsigned int
115	isdn_divert_poll(struct file file, poll_table wait)
116	{
117	unsigned int mask = 0;
118
119	poll_wait(file, &(rd_queue), wait);
120	/* mask = POLLOUT \| POLLWRNORM; */
121	if (((struct divert_info *) file->private_data)) {
122	mask \|= POLLIN \| POLLRDNORM;
123	}
124	return mask;
125	} /* isdn_divert_poll */
126
127	/****************/
128	/* Open routine */
129	/****************/
130	static int
131	isdn_divert_open(struct inode ino, struct file filep)
132	{
133	unsigned long flags;
134
135	spin_lock_irqsave( &divert_info_lock, flags );
136	if_used++;
137	if (divert_info_head)
138	filep->private_data = &(divert_info_tail->next);
139	else
140	filep->private_data = &divert_info_head;
141	spin_unlock_irqrestore( &divert_info_lock, flags );
142	/* start_divert(); */
143	return nonseekable_open(ino, filep);
144	} /* isdn_divert_open */
145
146	/*******************/
147	/* close routine */
148	/*******************/
149	static int
150	isdn_divert_close(struct inode ino, struct file filep)
151	{
152	struct divert_info *inf;
153	unsigned long flags;
154
155	spin_lock_irqsave( &divert_info_lock, flags );
156	if_used--;
157	inf = ((struct divert_info *) filep->private_data);
158	while (inf) {
159	inf->usage_cnt--;
160	inf = inf->next;
161	}
162	if (if_used <= 0)
163	while (divert_info_head) {
164	inf = divert_info_head;
165	divert_info_head = divert_info_head->next;
166	kfree(inf);
167	}
168	spin_unlock_irqrestore( &divert_info_lock, flags );
169	return (0);
170	} /* isdn_divert_close */
171
172	/*********/
173	/* IOCTL */
174	/*********/
175	static int
176	isdn_divert_ioctl(struct inode inode, struct file file,
177	uint cmd, ulong arg)
178	{
179	divert_ioctl dioctl;
180	int i;
181	unsigned long flags;
182	divert_rule *rulep;
183	char *cp;
184
185	if (copy_from_user(&dioctl, (void __user *) arg, sizeof(dioctl)))
186	return -EFAULT;
187
188	switch (cmd) {
189	case IIOCGETVER:
190	dioctl.drv_version = DIVERT_IIOC_VERSION; /* set version */
191	break;
192
193	case IIOCGETDRV:
194	if ((dioctl.getid.drvid = divert_if.name_to_drv(dioctl.getid.drvnam)) < 0)
195	return (-EINVAL);
196	break;
197
198	case IIOCGETNAM:
199	cp = divert_if.drv_to_name(dioctl.getid.drvid);
200	if (!cp)
201	return (-EINVAL);
202	if (!*cp)
203	return (-EINVAL);
204	strcpy(dioctl.getid.drvnam, cp);
205	break;
206
207	case IIOCGETRULE:
208	if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
209	return (-EINVAL);
210	dioctl.getsetrule.rule = rulep; / copy data */
211	break;
212
213	case IIOCMODRULE:
214	if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
215	return (-EINVAL);
216	spin_lock_irqsave(&divert_lock, flags);
217	rulep = dioctl.getsetrule.rule; / copy data */
218	spin_unlock_irqrestore(&divert_lock, flags);
219	return (0); /* no copy required */
220	break;
221
222	case IIOCINSRULE:
223	return (insertrule(dioctl.getsetrule.ruleidx, &dioctl.getsetrule.rule));
224	break;
225
226	case IIOCDELRULE:
227	return (deleterule(dioctl.getsetrule.ruleidx));
228	break;
229
230	case IIOCDODFACT:
231	return (deflect_extern_action(dioctl.fwd_ctrl.subcmd,
232	dioctl.fwd_ctrl.callid,
233	dioctl.fwd_ctrl.to_nr));
234
235	case IIOCDOCFACT:
236	case IIOCDOCFDIS:
237	case IIOCDOCFINT:
238	if (!divert_if.drv_to_name(dioctl.cf_ctrl.drvid))
239	return (-EINVAL); /* invalid driver */
240	if ((i = cf_command(dioctl.cf_ctrl.drvid,
241	(cmd == IIOCDOCFACT) ? 1 : (cmd == IIOCDOCFDIS) ? 0 : 2,
242	dioctl.cf_ctrl.cfproc,
243	dioctl.cf_ctrl.msn,
244	dioctl.cf_ctrl.service,
245	dioctl.cf_ctrl.fwd_nr,
246	&dioctl.cf_ctrl.procid)))
247	return (i);
248	break;
249
250	default:
251	return (-EINVAL);
252	} /* switch cmd */
253	return copy_to_user((void __user *)arg, &dioctl, sizeof(dioctl)) ? -EFAULT : 0;
254	} /* isdn_divert_ioctl */
255
256
257	#ifdef CONFIG_PROC_FS
2b8693c0	258	static const struct file_operations isdn_fops =
1da177e4 LT	259	{
	260	.owner = THIS_MODULE,
	261	.llseek = no_llseek,
	262	.read = isdn_divert_read,
	263	.write = isdn_divert_write,
	264	.poll = isdn_divert_poll,
	265	.ioctl = isdn_divert_ioctl,
	266	.open = isdn_divert_open,
	267	.release = isdn_divert_close,
	268	};
	269
	270	/****************************/
	271	/* isdn subdir in /proc/net */
	272	/****************************/
	273	static struct proc_dir_entry *isdn_proc_entry = NULL;
	274	static struct proc_dir_entry *isdn_divert_entry = NULL;
	275	#endif /* CONFIG_PROC_FS */
	276
	277	/***************************************************************************/
	278	/* divert_dev_init must be called before the proc filesystem may be used */
	279	/***************************************************************************/
	280	int
	281	divert_dev_init(void)
	282	{
	283
	284	init_waitqueue_head(&rd_queue);
	285
	286	#ifdef CONFIG_PROC_FS
66600221	287	isdn_proc_entry = proc_mkdir("net/isdn", NULL);
1da177e4 LT	288	if (!isdn_proc_entry)
	289	return (-1);
	290	isdn_divert_entry = create_proc_entry("divert", S_IFREG \| S_IRUGO, isdn_proc_entry);
	291	if (!isdn_divert_entry) {
66600221	292	remove_proc_entry("net/isdn", NULL);
1da177e4 LT	293	return (-1);
	294	}
	295	isdn_divert_entry->proc_fops = &isdn_fops;
	296	isdn_divert_entry->owner = THIS_MODULE;
	297	#endif /* CONFIG_PROC_FS */
	298
	299	return (0);
	300	} /* divert_dev_init */
	301
	302	/***************************************************************************/
	303	/* divert_dev_deinit must be called before leaving isdn when included as */
	304	/* a module. */
	305	/***************************************************************************/
	306	int
	307	divert_dev_deinit(void)
	308	{
	309
	310	#ifdef CONFIG_PROC_FS
	311	remove_proc_entry("divert", isdn_proc_entry);
66600221	312	remove_proc_entry("net/isdn", NULL);
1da177e4 LT	313	#endif /* CONFIG_PROC_FS */
	314
	315	return (0);
	316	} /* divert_dev_deinit */