1 /*
2 * Copyright 2008 by Karsten Keil <kkeil@novell.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 */
14
15 #include <linux/slab.h>
16 #include <linux/types.h>
17 #include <linux/stddef.h>
18 #include <linux/module.h>
19 #include <linux/spinlock.h>
20 #include <linux/mISDNif.h>
21 #include "core.h"
22
23 static u_int debug;
24
25 MODULE_AUTHOR("Karsten Keil");
26 MODULE_LICENSE("GPL");
27 module_param(debug, uint, S_IRUGO | S_IWUSR);
28
29 static u64 device_ids;
30 #define MAX_DEVICE_ID 63
31
32 static LIST_HEAD(Bprotocols);
33 static DEFINE_RWLOCK(bp_lock);
34
mISDN_dev_release(struct device * dev)35 static void mISDN_dev_release(struct device *dev)
36 {
37 /* nothing to do: the device is part of its parent's data structure */
38 }
39
_show_id(struct device * dev,struct device_attribute * attr,char * buf)40 static ssize_t _show_id(struct device *dev,
41 struct device_attribute *attr, char *buf)
42 {
43 struct mISDNdevice *mdev = dev_to_mISDN(dev);
44
45 if (!mdev)
46 return -ENODEV;
47 return sprintf(buf, "%d\n", mdev->id);
48 }
49
_show_nrbchan(struct device * dev,struct device_attribute * attr,char * buf)50 static ssize_t _show_nrbchan(struct device *dev,
51 struct device_attribute *attr, char *buf)
52 {
53 struct mISDNdevice *mdev = dev_to_mISDN(dev);
54
55 if (!mdev)
56 return -ENODEV;
57 return sprintf(buf, "%d\n", mdev->nrbchan);
58 }
59
_show_d_protocols(struct device * dev,struct device_attribute * attr,char * buf)60 static ssize_t _show_d_protocols(struct device *dev,
61 struct device_attribute *attr, char *buf)
62 {
63 struct mISDNdevice *mdev = dev_to_mISDN(dev);
64
65 if (!mdev)
66 return -ENODEV;
67 return sprintf(buf, "%d\n", mdev->Dprotocols);
68 }
69
_show_b_protocols(struct device * dev,struct device_attribute * attr,char * buf)70 static ssize_t _show_b_protocols(struct device *dev,
71 struct device_attribute *attr, char *buf)
72 {
73 struct mISDNdevice *mdev = dev_to_mISDN(dev);
74
75 if (!mdev)
76 return -ENODEV;
77 return sprintf(buf, "%d\n", mdev->Bprotocols | get_all_Bprotocols());
78 }
79
_show_protocol(struct device * dev,struct device_attribute * attr,char * buf)80 static ssize_t _show_protocol(struct device *dev,
81 struct device_attribute *attr, char *buf)
82 {
83 struct mISDNdevice *mdev = dev_to_mISDN(dev);
84
85 if (!mdev)
86 return -ENODEV;
87 return sprintf(buf, "%d\n", mdev->D.protocol);
88 }
89
_show_name(struct device * dev,struct device_attribute * attr,char * buf)90 static ssize_t _show_name(struct device *dev,
91 struct device_attribute *attr, char *buf)
92 {
93 strcpy(buf, dev_name(dev));
94 return strlen(buf);
95 }
96
97 #if 0 /* hangs */
98 static ssize_t _set_name(struct device *dev, struct device_attribute *attr,
99 const char *buf, size_t count)
100 {
101 int err = 0;
102 char *out = kmalloc(count + 1, GFP_KERNEL);
103
104 if (!out)
105 return -ENOMEM;
106
107 memcpy(out, buf, count);
108 if (count && out[count - 1] == '\n')
109 out[--count] = 0;
110 if (count)
111 err = device_rename(dev, out);
112 kfree(out);
113
114 return (err < 0) ? err : count;
115 }
116 #endif
117
_show_channelmap(struct device * dev,struct device_attribute * attr,char * buf)118 static ssize_t _show_channelmap(struct device *dev,
119 struct device_attribute *attr, char *buf)
120 {
121 struct mISDNdevice *mdev = dev_to_mISDN(dev);
122 char *bp = buf;
123 int i;
124
125 for (i = 0; i <= mdev->nrbchan; i++)
126 *bp++ = test_channelmap(i, mdev->channelmap) ? '1' : '0';
127
128 return bp - buf;
129 }
130
131 static struct device_attribute mISDN_dev_attrs[] = {
132 __ATTR(id, S_IRUGO, _show_id, NULL),
133 __ATTR(d_protocols, S_IRUGO, _show_d_protocols, NULL),
134 __ATTR(b_protocols, S_IRUGO, _show_b_protocols, NULL),
135 __ATTR(protocol, S_IRUGO, _show_protocol, NULL),
136 __ATTR(channelmap, S_IRUGO, _show_channelmap, NULL),
137 __ATTR(nrbchan, S_IRUGO, _show_nrbchan, NULL),
138 __ATTR(name, S_IRUGO, _show_name, NULL),
139 /* __ATTR(name, S_IRUGO | S_IWUSR, _show_name, _set_name), */
140 {}
141 };
142
mISDN_uevent(struct device * dev,struct kobj_uevent_env * env)143 static int mISDN_uevent(struct device *dev, struct kobj_uevent_env *env)
144 {
145 struct mISDNdevice *mdev = dev_to_mISDN(dev);
146
147 if (!mdev)
148 return 0;
149
150 if (add_uevent_var(env, "nchans=%d", mdev->nrbchan))
151 return -ENOMEM;
152
153 return 0;
154 }
155
mISDN_class_release(struct class * cls)156 static void mISDN_class_release(struct class *cls)
157 {
158 /* do nothing, it's static */
159 }
160
161 static struct class mISDN_class = {
162 .name = "mISDN",
163 .owner = THIS_MODULE,
164 .dev_uevent = mISDN_uevent,
165 .dev_attrs = mISDN_dev_attrs,
166 .dev_release = mISDN_dev_release,
167 .class_release = mISDN_class_release,
168 };
169
170 static int
_get_mdevice(struct device * dev,const void * id)171 _get_mdevice(struct device *dev, const void *id)
172 {
173 struct mISDNdevice *mdev = dev_to_mISDN(dev);
174
175 if (!mdev)
176 return 0;
177 if (mdev->id != *(const u_int *)id)
178 return 0;
179 return 1;
180 }
181
182 struct mISDNdevice
get_mdevice(u_int id)183 *get_mdevice(u_int id)
184 {
185 return dev_to_mISDN(class_find_device(&mISDN_class, NULL, &id,
186 _get_mdevice));
187 }
188
189 static int
_get_mdevice_count(struct device * dev,void * cnt)190 _get_mdevice_count(struct device *dev, void *cnt)
191 {
192 *(int *)cnt += 1;
193 return 0;
194 }
195
196 int
get_mdevice_count(void)197 get_mdevice_count(void)
198 {
199 int cnt = 0;
200
201 class_for_each_device(&mISDN_class, NULL, &cnt, _get_mdevice_count);
202 return cnt;
203 }
204
205 static int
get_free_devid(void)206 get_free_devid(void)
207 {
208 u_int i;
209
210 for (i = 0; i <= MAX_DEVICE_ID; i++)
211 if (!test_and_set_bit(i, (u_long *)&device_ids))
212 break;
213 if (i > MAX_DEVICE_ID)
214 return -EBUSY;
215 return i;
216 }
217
218 int
mISDN_register_device(struct mISDNdevice * dev,struct device * parent,char * name)219 mISDN_register_device(struct mISDNdevice *dev,
220 struct device *parent, char *name)
221 {
222 int err;
223
224 err = get_free_devid();
225 if (err < 0)
226 goto error1;
227 dev->id = err;
228
229 device_initialize(&dev->dev);
230 if (name && name[0])
231 dev_set_name(&dev->dev, "%s", name);
232 else
233 dev_set_name(&dev->dev, "mISDN%d", dev->id);
234 if (debug & DEBUG_CORE)
235 printk(KERN_DEBUG "mISDN_register %s %d\n",
236 dev_name(&dev->dev), dev->id);
237 err = create_stack(dev);
238 if (err)
239 goto error1;
240
241 dev->dev.class = &mISDN_class;
242 dev->dev.platform_data = dev;
243 dev->dev.parent = parent;
244 dev_set_drvdata(&dev->dev, dev);
245
246 err = device_add(&dev->dev);
247 if (err)
248 goto error3;
249 return 0;
250
251 error3:
252 delete_stack(dev);
253 return err;
254 error1:
255 return err;
256
257 }
258 EXPORT_SYMBOL(mISDN_register_device);
259
260 void
mISDN_unregister_device(struct mISDNdevice * dev)261 mISDN_unregister_device(struct mISDNdevice *dev) {
262 if (debug & DEBUG_CORE)
263 printk(KERN_DEBUG "mISDN_unregister %s %d\n",
264 dev_name(&dev->dev), dev->id);
265 /* sysfs_remove_link(&dev->dev.kobj, "device"); */
266 device_del(&dev->dev);
267 dev_set_drvdata(&dev->dev, NULL);
268
269 test_and_clear_bit(dev->id, (u_long *)&device_ids);
270 delete_stack(dev);
271 put_device(&dev->dev);
272 }
273 EXPORT_SYMBOL(mISDN_unregister_device);
274
275 u_int
get_all_Bprotocols(void)276 get_all_Bprotocols(void)
277 {
278 struct Bprotocol *bp;
279 u_int m = 0;
280
281 read_lock(&bp_lock);
282 list_for_each_entry(bp, &Bprotocols, list)
283 m |= bp->Bprotocols;
284 read_unlock(&bp_lock);
285 return m;
286 }
287
288 struct Bprotocol *
get_Bprotocol4mask(u_int m)289 get_Bprotocol4mask(u_int m)
290 {
291 struct Bprotocol *bp;
292
293 read_lock(&bp_lock);
294 list_for_each_entry(bp, &Bprotocols, list)
295 if (bp->Bprotocols & m) {
296 read_unlock(&bp_lock);
297 return bp;
298 }
299 read_unlock(&bp_lock);
300 return NULL;
301 }
302
303 struct Bprotocol *
get_Bprotocol4id(u_int id)304 get_Bprotocol4id(u_int id)
305 {
306 u_int m;
307
308 if (id < ISDN_P_B_START || id > 63) {
309 printk(KERN_WARNING "%s id not in range %d\n",
310 __func__, id);
311 return NULL;
312 }
313 m = 1 << (id & ISDN_P_B_MASK);
314 return get_Bprotocol4mask(m);
315 }
316
317 int
mISDN_register_Bprotocol(struct Bprotocol * bp)318 mISDN_register_Bprotocol(struct Bprotocol *bp)
319 {
320 u_long flags;
321 struct Bprotocol *old;
322
323 if (debug & DEBUG_CORE)
324 printk(KERN_DEBUG "%s: %s/%x\n", __func__,
325 bp->name, bp->Bprotocols);
326 old = get_Bprotocol4mask(bp->Bprotocols);
327 if (old) {
328 printk(KERN_WARNING
329 "register duplicate protocol old %s/%x new %s/%x\n",
330 old->name, old->Bprotocols, bp->name, bp->Bprotocols);
331 return -EBUSY;
332 }
333 write_lock_irqsave(&bp_lock, flags);
334 list_add_tail(&bp->list, &Bprotocols);
335 write_unlock_irqrestore(&bp_lock, flags);
336 return 0;
337 }
338 EXPORT_SYMBOL(mISDN_register_Bprotocol);
339
340 void
mISDN_unregister_Bprotocol(struct Bprotocol * bp)341 mISDN_unregister_Bprotocol(struct Bprotocol *bp)
342 {
343 u_long flags;
344
345 if (debug & DEBUG_CORE)
346 printk(KERN_DEBUG "%s: %s/%x\n", __func__, bp->name,
347 bp->Bprotocols);
348 write_lock_irqsave(&bp_lock, flags);
349 list_del(&bp->list);
350 write_unlock_irqrestore(&bp_lock, flags);
351 }
352 EXPORT_SYMBOL(mISDN_unregister_Bprotocol);
353
354 static const char *msg_no_channel = "<no channel>";
355 static const char *msg_no_stack = "<no stack>";
356 static const char *msg_no_stackdev = "<no stack device>";
357
mISDNDevName4ch(struct mISDNchannel * ch)358 const char *mISDNDevName4ch(struct mISDNchannel *ch)
359 {
360 if (!ch)
361 return msg_no_channel;
362 if (!ch->st)
363 return msg_no_stack;
364 if (!ch->st->dev)
365 return msg_no_stackdev;
366 return dev_name(&ch->st->dev->dev);
367 };
368 EXPORT_SYMBOL(mISDNDevName4ch);
369
370 static int
mISDNInit(void)371 mISDNInit(void)
372 {
373 int err;
374
375 printk(KERN_INFO "Modular ISDN core version %d.%d.%d\n",
376 MISDN_MAJOR_VERSION, MISDN_MINOR_VERSION, MISDN_RELEASE);
377 mISDN_init_clock(&debug);
378 mISDN_initstack(&debug);
379 err = class_register(&mISDN_class);
380 if (err)
381 goto error1;
382 err = mISDN_inittimer(&debug);
383 if (err)
384 goto error2;
385 err = l1_init(&debug);
386 if (err)
387 goto error3;
388 err = Isdnl2_Init(&debug);
389 if (err)
390 goto error4;
391 err = misdn_sock_init(&debug);
392 if (err)
393 goto error5;
394 return 0;
395
396 error5:
397 Isdnl2_cleanup();
398 error4:
399 l1_cleanup();
400 error3:
401 mISDN_timer_cleanup();
402 error2:
403 class_unregister(&mISDN_class);
404 error1:
405 return err;
406 }
407
mISDN_cleanup(void)408 static void mISDN_cleanup(void)
409 {
410 misdn_sock_cleanup();
411 Isdnl2_cleanup();
412 l1_cleanup();
413 mISDN_timer_cleanup();
414 class_unregister(&mISDN_class);
415
416 printk(KERN_DEBUG "mISDNcore unloaded\n");
417 }
418
419 module_init(mISDNInit);
420 module_exit(mISDN_cleanup);
421