Commit | Line | Data |
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1b2b03f8 KK |
1 | /* |
2 | * | |
3 | * general timer device for using in ISDN stacks | |
4 | * | |
5 | * Author Karsten Keil <kkeil@novell.com> | |
6 | * | |
7 | * Copyright 2008 by Karsten Keil <kkeil@novell.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | */ | |
19 | ||
20 | #include <linux/poll.h> | |
21 | #include <linux/vmalloc.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
1b2b03f8 KK |
23 | #include <linux/timer.h> |
24 | #include <linux/miscdevice.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/mISDNif.h> | |
76a64921 | 27 | #include <linux/mutex.h> |
5b834354 | 28 | #include "core.h" |
1b2b03f8 | 29 | |
76a64921 | 30 | static DEFINE_MUTEX(mISDN_mutex); |
dfa96ec1 | 31 | static u_int *debug; |
1b2b03f8 KK |
32 | |
33 | ||
34 | struct mISDNtimerdev { | |
35 | int next_id; | |
36 | struct list_head pending; | |
37 | struct list_head expired; | |
38 | wait_queue_head_t wait; | |
39 | u_int work; | |
40 | spinlock_t lock; /* protect lists */ | |
41 | }; | |
42 | ||
43 | struct mISDNtimer { | |
44 | struct list_head list; | |
45 | struct mISDNtimerdev *dev; | |
46 | struct timer_list tl; | |
47 | int id; | |
48 | }; | |
49 | ||
50 | static int | |
51 | mISDN_open(struct inode *ino, struct file *filep) | |
52 | { | |
53 | struct mISDNtimerdev *dev; | |
54 | ||
55 | if (*debug & DEBUG_TIMER) | |
56 | printk(KERN_DEBUG "%s(%p,%p)\n", __func__, ino, filep); | |
57 | dev = kmalloc(sizeof(struct mISDNtimerdev) , GFP_KERNEL); | |
58 | if (!dev) | |
59 | return -ENOMEM; | |
60 | dev->next_id = 1; | |
61 | INIT_LIST_HEAD(&dev->pending); | |
62 | INIT_LIST_HEAD(&dev->expired); | |
63 | spin_lock_init(&dev->lock); | |
64 | dev->work = 0; | |
65 | init_waitqueue_head(&dev->wait); | |
66 | filep->private_data = dev; | |
6bff338b | 67 | return nonseekable_open(ino, filep); |
1b2b03f8 KK |
68 | } |
69 | ||
70 | static int | |
71 | mISDN_close(struct inode *ino, struct file *filep) | |
72 | { | |
73 | struct mISDNtimerdev *dev = filep->private_data; | |
c08c464d | 74 | struct list_head *list = &dev->pending; |
1b2b03f8 KK |
75 | struct mISDNtimer *timer, *next; |
76 | ||
77 | if (*debug & DEBUG_TIMER) | |
78 | printk(KERN_DEBUG "%s(%p,%p)\n", __func__, ino, filep); | |
c08c464d AV |
79 | |
80 | spin_lock_irq(&dev->lock); | |
81 | while (!list_empty(list)) { | |
82 | timer = list_first_entry(list, struct mISDNtimer, list); | |
83 | spin_unlock_irq(&dev->lock); | |
84 | del_timer_sync(&timer->tl); | |
85 | spin_lock_irq(&dev->lock); | |
86 | /* it might have been moved to ->expired */ | |
87 | list_del(&timer->list); | |
1b2b03f8 KK |
88 | kfree(timer); |
89 | } | |
c08c464d AV |
90 | spin_unlock_irq(&dev->lock); |
91 | ||
1b2b03f8 KK |
92 | list_for_each_entry_safe(timer, next, &dev->expired, list) { |
93 | kfree(timer); | |
94 | } | |
95 | kfree(dev); | |
1b2b03f8 KK |
96 | return 0; |
97 | } | |
98 | ||
99 | static ssize_t | |
c46f0a2d | 100 | mISDN_read(struct file *filep, char __user *buf, size_t count, loff_t *off) |
1b2b03f8 KK |
101 | { |
102 | struct mISDNtimerdev *dev = filep->private_data; | |
ebb06be1 | 103 | struct list_head *list = &dev->expired; |
1b2b03f8 | 104 | struct mISDNtimer *timer; |
1b2b03f8 KK |
105 | int ret = 0; |
106 | ||
107 | if (*debug & DEBUG_TIMER) | |
108 | printk(KERN_DEBUG "%s(%p, %p, %d, %p)\n", __func__, | |
475be4d8 | 109 | filep, buf, (int)count, off); |
1b2b03f8 | 110 | |
ebb06be1 AV |
111 | if (count < sizeof(int)) |
112 | return -ENOSPC; | |
113 | ||
114 | spin_lock_irq(&dev->lock); | |
115 | while (list_empty(list) && (dev->work == 0)) { | |
116 | spin_unlock_irq(&dev->lock); | |
1b2b03f8 KK |
117 | if (filep->f_flags & O_NONBLOCK) |
118 | return -EAGAIN; | |
119 | wait_event_interruptible(dev->wait, (dev->work || | |
ebb06be1 | 120 | !list_empty(list))); |
1b2b03f8 KK |
121 | if (signal_pending(current)) |
122 | return -ERESTARTSYS; | |
ebb06be1 | 123 | spin_lock_irq(&dev->lock); |
1b2b03f8 | 124 | } |
1b2b03f8 KK |
125 | if (dev->work) |
126 | dev->work = 0; | |
ebb06be1 AV |
127 | if (!list_empty(list)) { |
128 | timer = list_first_entry(list, struct mISDNtimer, list); | |
1b2b03f8 | 129 | list_del(&timer->list); |
ebb06be1 | 130 | spin_unlock_irq(&dev->lock); |
c46f0a2d | 131 | if (put_user(timer->id, (int __user *)buf)) |
1b2b03f8 KK |
132 | ret = -EFAULT; |
133 | else | |
134 | ret = sizeof(int); | |
135 | kfree(timer); | |
ebb06be1 AV |
136 | } else { |
137 | spin_unlock_irq(&dev->lock); | |
1b2b03f8 KK |
138 | } |
139 | return ret; | |
140 | } | |
141 | ||
1b2b03f8 KK |
142 | static unsigned int |
143 | mISDN_poll(struct file *filep, poll_table *wait) | |
144 | { | |
145 | struct mISDNtimerdev *dev = filep->private_data; | |
146 | unsigned int mask = POLLERR; | |
147 | ||
148 | if (*debug & DEBUG_TIMER) | |
149 | printk(KERN_DEBUG "%s(%p, %p)\n", __func__, filep, wait); | |
150 | if (dev) { | |
151 | poll_wait(filep, &dev->wait, wait); | |
152 | mask = 0; | |
153 | if (dev->work || !list_empty(&dev->expired)) | |
154 | mask |= (POLLIN | POLLRDNORM); | |
155 | if (*debug & DEBUG_TIMER) | |
156 | printk(KERN_DEBUG "%s work(%d) empty(%d)\n", __func__, | |
475be4d8 | 157 | dev->work, list_empty(&dev->expired)); |
1b2b03f8 KK |
158 | } |
159 | return mask; | |
160 | } | |
161 | ||
162 | static void | |
ce425a9f | 163 | dev_expire_timer(unsigned long data) |
1b2b03f8 | 164 | { |
ce425a9f | 165 | struct mISDNtimer *timer = (void *)data; |
1b2b03f8 KK |
166 | u_long flags; |
167 | ||
168 | spin_lock_irqsave(&timer->dev->lock, flags); | |
1b108956 AV |
169 | if (timer->id >= 0) |
170 | list_move_tail(&timer->list, &timer->dev->expired); | |
1b2b03f8 KK |
171 | spin_unlock_irqrestore(&timer->dev->lock, flags); |
172 | wake_up_interruptible(&timer->dev->wait); | |
173 | } | |
174 | ||
175 | static int | |
176 | misdn_add_timer(struct mISDNtimerdev *dev, int timeout) | |
177 | { | |
475be4d8 | 178 | int id; |
1b2b03f8 KK |
179 | struct mISDNtimer *timer; |
180 | ||
181 | if (!timeout) { | |
182 | dev->work = 1; | |
183 | wake_up_interruptible(&dev->wait); | |
184 | id = 0; | |
185 | } else { | |
186 | timer = kzalloc(sizeof(struct mISDNtimer), GFP_KERNEL); | |
187 | if (!timer) | |
188 | return -ENOMEM; | |
1678ec00 AV |
189 | timer->dev = dev; |
190 | setup_timer(&timer->tl, dev_expire_timer, (long)timer); | |
191 | spin_lock_irq(&dev->lock); | |
192 | id = timer->id = dev->next_id++; | |
1b2b03f8 KK |
193 | if (dev->next_id < 0) |
194 | dev->next_id = 1; | |
195 | list_add_tail(&timer->list, &dev->pending); | |
1b2b03f8 KK |
196 | timer->tl.expires = jiffies + ((HZ * (u_long)timeout) / 1000); |
197 | add_timer(&timer->tl); | |
1678ec00 | 198 | spin_unlock_irq(&dev->lock); |
1b2b03f8 KK |
199 | } |
200 | return id; | |
201 | } | |
202 | ||
203 | static int | |
204 | misdn_del_timer(struct mISDNtimerdev *dev, int id) | |
205 | { | |
1b2b03f8 | 206 | struct mISDNtimer *timer; |
1b2b03f8 | 207 | |
1b108956 | 208 | spin_lock_irq(&dev->lock); |
1b2b03f8 KK |
209 | list_for_each_entry(timer, &dev->pending, list) { |
210 | if (timer->id == id) { | |
211 | list_del_init(&timer->list); | |
1b108956 AV |
212 | timer->id = -1; |
213 | spin_unlock_irq(&dev->lock); | |
214 | del_timer_sync(&timer->tl); | |
1b2b03f8 | 215 | kfree(timer); |
1b108956 | 216 | return id; |
1b2b03f8 KK |
217 | } |
218 | } | |
1b108956 AV |
219 | spin_unlock_irq(&dev->lock); |
220 | return 0; | |
1b2b03f8 KK |
221 | } |
222 | ||
703c631e AB |
223 | static long |
224 | mISDN_ioctl(struct file *filep, unsigned int cmd, unsigned long arg) | |
1b2b03f8 KK |
225 | { |
226 | struct mISDNtimerdev *dev = filep->private_data; | |
227 | int id, tout, ret = 0; | |
228 | ||
229 | ||
230 | if (*debug & DEBUG_TIMER) | |
231 | printk(KERN_DEBUG "%s(%p, %x, %lx)\n", __func__, | |
475be4d8 | 232 | filep, cmd, arg); |
76a64921 | 233 | mutex_lock(&mISDN_mutex); |
1b2b03f8 KK |
234 | switch (cmd) { |
235 | case IMADDTIMER: | |
236 | if (get_user(tout, (int __user *)arg)) { | |
237 | ret = -EFAULT; | |
238 | break; | |
239 | } | |
240 | id = misdn_add_timer(dev, tout); | |
241 | if (*debug & DEBUG_TIMER) | |
242 | printk(KERN_DEBUG "%s add %d id %d\n", __func__, | |
475be4d8 | 243 | tout, id); |
1b2b03f8 KK |
244 | if (id < 0) { |
245 | ret = id; | |
246 | break; | |
247 | } | |
248 | if (put_user(id, (int __user *)arg)) | |
249 | ret = -EFAULT; | |
250 | break; | |
251 | case IMDELTIMER: | |
252 | if (get_user(id, (int __user *)arg)) { | |
253 | ret = -EFAULT; | |
254 | break; | |
255 | } | |
256 | if (*debug & DEBUG_TIMER) | |
257 | printk(KERN_DEBUG "%s del id %d\n", __func__, id); | |
258 | id = misdn_del_timer(dev, id); | |
259 | if (put_user(id, (int __user *)arg)) | |
260 | ret = -EFAULT; | |
261 | break; | |
262 | default: | |
263 | ret = -EINVAL; | |
264 | } | |
76a64921 | 265 | mutex_unlock(&mISDN_mutex); |
1b2b03f8 KK |
266 | return ret; |
267 | } | |
268 | ||
eac74af9 | 269 | static const struct file_operations mISDN_fops = { |
89b107ad | 270 | .owner = THIS_MODULE, |
1b2b03f8 | 271 | .read = mISDN_read, |
1b2b03f8 | 272 | .poll = mISDN_poll, |
703c631e | 273 | .unlocked_ioctl = mISDN_ioctl, |
1b2b03f8 KK |
274 | .open = mISDN_open, |
275 | .release = mISDN_close, | |
6038f373 | 276 | .llseek = no_llseek, |
1b2b03f8 KK |
277 | }; |
278 | ||
279 | static struct miscdevice mISDNtimer = { | |
280 | .minor = MISC_DYNAMIC_MINOR, | |
281 | .name = "mISDNtimer", | |
282 | .fops = &mISDN_fops, | |
283 | }; | |
284 | ||
285 | int | |
dfa96ec1 | 286 | mISDN_inittimer(u_int *deb) |
1b2b03f8 KK |
287 | { |
288 | int err; | |
289 | ||
290 | debug = deb; | |
291 | err = misc_register(&mISDNtimer); | |
292 | if (err) | |
293 | printk(KERN_WARNING "mISDN: Could not register timer device\n"); | |
294 | return err; | |
295 | } | |
296 | ||
297 | void mISDN_timer_cleanup(void) | |
298 | { | |
299 | misc_deregister(&mISDNtimer); | |
300 | } |