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gerrit-public.fairphone.software / kernel / msm-4.19 / 6a6e1b1cf41b0bf35fffbf18787e8d8f865b66d6 / . / drivers / isdn / divert / divert_procfs.c
blob: e1f0d87de0eb1f072f4c38c2954c673ec509462c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]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
12#include <linux/config.h>
13#include <linux/module.h>
14#include <linux/version.h>
15#include <linux/poll.h>
16#include <linux/smp_lock.h>
17#ifdef CONFIG_PROC_FS
18#include <linux/proc_fs.h>
19#else
20#include <linux/fs.h>
21#endif
22#include <linux/isdnif.h>
23#include "isdn_divert.h"
24
25
26/*********************************/
27/* Variables for interface queue */
28/*********************************/
29ulong if_used = 0; /* number of interface users */
30static struct divert_info *divert_info_head = NULL; /* head of queue */
31static struct divert_info *divert_info_tail = NULL; /* pointer to last entry */
32static DEFINE_SPINLOCK(divert_info_lock);/* lock for queue */
33static wait_queue_head_t rd_queue;
34
35/*********************************/
36/* put an info buffer into queue */
37/*********************************/
38void
39put_info_buffer(char *cp)
40{
41 struct divert_info *ib;
42 unsigned long flags;
43
44 if (if_used <= 0)
45 return;
46 if (!cp)
47 return;
48 if (!*cp)
49 return;
50 if (!(ib = (struct divert_info *) kmalloc(sizeof(struct divert_info) + strlen(cp), GFP_ATOMIC)))
51 return; /* no memory */
52 strcpy(ib->info_start, cp); /* set output string */
53 ib->next = NULL;
54 spin_lock_irqsave( &divert_info_lock, flags );
55 ib->usage_cnt = if_used;
56 if (!divert_info_head)
57 divert_info_head = ib; /* new head */
58 else
59 divert_info_tail->next = ib; /* follows existing messages */
60 divert_info_tail = ib; /* new tail */
61
62 /* delete old entrys */
63 while (divert_info_head->next) {
64 if ((divert_info_head->usage_cnt <= 0) &&
65 (divert_info_head->next->usage_cnt <= 0)) {
66 ib = divert_info_head;
67 divert_info_head = divert_info_head->next;
68 kfree(ib);
69 } else
70 break;
71 } /* divert_info_head->next */
72 spin_unlock_irqrestore( &divert_info_lock, flags );
73 wake_up_interruptible(&(rd_queue));
74} /* put_info_buffer */
75
76/**********************************/
77/* deflection device read routine */
78/**********************************/
79static ssize_t
80isdn_divert_read(struct file *file, char __user *buf, size_t count, loff_t * off)
81{
82 struct divert_info *inf;
83 int len;
84
85 if (!*((struct divert_info **) file->private_data)) {
86 if (file->f_flags & O_NONBLOCK)
87 return -EAGAIN;
88 interruptible_sleep_on(&(rd_queue));
89 }
90 if (!(inf = *((struct divert_info **) file->private_data)))
91 return (0);
92
93 inf->usage_cnt--; /* new usage count */
94 file->private_data = &inf->next; /* next structure */
95 if ((len = strlen(inf->info_start)) <= count) {
96 if (copy_to_user(buf, inf->info_start, len))
97 return -EFAULT;
98 *off += len;
99 return (len);
100 }
101 return (0);
102} /* isdn_divert_read */
103
104/**********************************/
105/* deflection device write routine */
106/**********************************/
107static ssize_t
108isdn_divert_write(struct file *file, const char __user *buf, size_t count, loff_t * off)
109{
110 return (-ENODEV);
111} /* isdn_divert_write */
112
113
114/***************************************/
115/* select routines for various kernels */
116/***************************************/
117static unsigned int
118isdn_divert_poll(struct file *file, poll_table * wait)
119{
120 unsigned int mask = 0;
121
122 poll_wait(file, &(rd_queue), wait);
123 /* mask = POLLOUT | POLLWRNORM; */
124 if (*((struct divert_info **) file->private_data)) {
125 mask |= POLLIN | POLLRDNORM;
126 }
127 return mask;
128} /* isdn_divert_poll */
129
130/****************/
131/* Open routine */
132/****************/
133static int
134isdn_divert_open(struct inode *ino, struct file *filep)
135{
136 unsigned long flags;
137
138 spin_lock_irqsave( &divert_info_lock, flags );
139 if_used++;
140 if (divert_info_head)
141 filep->private_data = &(divert_info_tail->next);
142 else
143 filep->private_data = &divert_info_head;
144 spin_unlock_irqrestore( &divert_info_lock, flags );
145 /* start_divert(); */
146 return nonseekable_open(ino, filep);
147} /* isdn_divert_open */
148
149/*******************/
150/* close routine */
151/*******************/
152static int
153isdn_divert_close(struct inode *ino, struct file *filep)
154{
155 struct divert_info *inf;
156 unsigned long flags;
157
158 spin_lock_irqsave( &divert_info_lock, flags );
159 if_used--;
160 inf = *((struct divert_info **) filep->private_data);
161 while (inf) {
162 inf->usage_cnt--;
163 inf = inf->next;
164 }
165 if (if_used <= 0)
166 while (divert_info_head) {
167 inf = divert_info_head;
168 divert_info_head = divert_info_head->next;
169 kfree(inf);
170 }
171 spin_unlock_irqrestore( &divert_info_lock, flags );
172 return (0);
173} /* isdn_divert_close */
174
175/*********/
176/* IOCTL */
177/*********/
178static int
179isdn_divert_ioctl(struct inode *inode, struct file *file,
180 uint cmd, ulong arg)
181{
182 divert_ioctl dioctl;
183 int i;
184 unsigned long flags;
185 divert_rule *rulep;
186 char *cp;
187
188 if (copy_from_user(&dioctl, (void __user *) arg, sizeof(dioctl)))
189 return -EFAULT;
190
191 switch (cmd) {
192 case IIOCGETVER:
193 dioctl.drv_version = DIVERT_IIOC_VERSION; /* set version */
194 break;
195
196 case IIOCGETDRV:
197 if ((dioctl.getid.drvid = divert_if.name_to_drv(dioctl.getid.drvnam)) < 0)
198 return (-EINVAL);
199 break;
200
201 case IIOCGETNAM:
202 cp = divert_if.drv_to_name(dioctl.getid.drvid);
203 if (!cp)
204 return (-EINVAL);
205 if (!*cp)
206 return (-EINVAL);
207 strcpy(dioctl.getid.drvnam, cp);
208 break;
209
210 case IIOCGETRULE:
211 if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
212 return (-EINVAL);
213 dioctl.getsetrule.rule = *rulep; /* copy data */
214 break;
215
216 case IIOCMODRULE:
217 if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
218 return (-EINVAL);
219 spin_lock_irqsave(&divert_lock, flags);
220 *rulep = dioctl.getsetrule.rule; /* copy data */
221 spin_unlock_irqrestore(&divert_lock, flags);
222 return (0); /* no copy required */
223 break;
224
225 case IIOCINSRULE:
226 return (insertrule(dioctl.getsetrule.ruleidx, &dioctl.getsetrule.rule));
227 break;
228
229 case IIOCDELRULE:
230 return (deleterule(dioctl.getsetrule.ruleidx));
231 break;
232
233 case IIOCDODFACT:
234 return (deflect_extern_action(dioctl.fwd_ctrl.subcmd,
235 dioctl.fwd_ctrl.callid,
236 dioctl.fwd_ctrl.to_nr));
237
238 case IIOCDOCFACT:
239 case IIOCDOCFDIS:
240 case IIOCDOCFINT:
241 if (!divert_if.drv_to_name(dioctl.cf_ctrl.drvid))
242 return (-EINVAL); /* invalid driver */
243 if ((i = cf_command(dioctl.cf_ctrl.drvid,
244 (cmd == IIOCDOCFACT) ? 1 : (cmd == IIOCDOCFDIS) ? 0 : 2,
245 dioctl.cf_ctrl.cfproc,
246 dioctl.cf_ctrl.msn,
247 dioctl.cf_ctrl.service,
248 dioctl.cf_ctrl.fwd_nr,
249 &dioctl.cf_ctrl.procid)))
250 return (i);
251 break;
252
253 default:
254 return (-EINVAL);
255 } /* switch cmd */
256 return copy_to_user((void __user *)arg, &dioctl, sizeof(dioctl)) ? -EFAULT : 0;
257} /* isdn_divert_ioctl */
258
259
260#ifdef CONFIG_PROC_FS
261static struct file_operations isdn_fops =
262{
263 .owner = THIS_MODULE,
264 .llseek = no_llseek,
265 .read = isdn_divert_read,
266 .write = isdn_divert_write,
267 .poll = isdn_divert_poll,
268 .ioctl = isdn_divert_ioctl,
269 .open = isdn_divert_open,
270 .release = isdn_divert_close,
271};
272
273/****************************/
274/* isdn subdir in /proc/net */
275/****************************/
276static struct proc_dir_entry *isdn_proc_entry = NULL;
277static struct proc_dir_entry *isdn_divert_entry = NULL;
278#endif /* CONFIG_PROC_FS */
279
280/***************************************************************************/
281/* divert_dev_init must be called before the proc filesystem may be used */
282/***************************************************************************/
283int
284divert_dev_init(void)
285{
286
287 init_waitqueue_head(&rd_queue);
288
289#ifdef CONFIG_PROC_FS
290 isdn_proc_entry = create_proc_entry("isdn", S_IFDIR | S_IRUGO | S_IXUGO, proc_net);
291 if (!isdn_proc_entry)
292 return (-1);
293 isdn_divert_entry = create_proc_entry("divert", S_IFREG | S_IRUGO, isdn_proc_entry);
294 if (!isdn_divert_entry) {
295 remove_proc_entry("isdn", proc_net);
296 return (-1);
297 }
298 isdn_divert_entry->proc_fops = &isdn_fops;
299 isdn_divert_entry->owner = THIS_MODULE;
300#endif /* CONFIG_PROC_FS */
301
302 return (0);
303} /* divert_dev_init */
304
305/***************************************************************************/
306/* divert_dev_deinit must be called before leaving isdn when included as */
307/* a module. */
308/***************************************************************************/
309int
310divert_dev_deinit(void)
311{
312
313#ifdef CONFIG_PROC_FS
314 remove_proc_entry("divert", isdn_proc_entry);
315 remove_proc_entry("isdn", proc_net);
316#endif /* CONFIG_PROC_FS */
317
318 return (0);
319} /* divert_dev_deinit */