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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
23static u_int debug;
24
25MODULE_AUTHOR("Karsten Keil");
26MODULE_LICENSE("GPL");
27module_param(debug, uint, S_IRUGO | S_IWUSR);
28
29static u64 device_ids;
30#define MAX_DEVICE_ID 63
31
32static LIST_HEAD(Bprotocols);
33static DEFINE_RWLOCK(bp_lock);
34
35static void mISDN_dev_release(struct device *dev)
36{
37
38}
39
40static 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
50static 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
60static 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
70static 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
80static 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
90static 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
98static 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
118static 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
131static 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
140 {}
141};
142
143#ifdef CONFIG_HOTPLUG
144static int mISDN_uevent(struct device *dev, struct kobj_uevent_env *env)
145{
146 struct mISDNdevice *mdev = dev_to_mISDN(dev);
147
148 if (!mdev)
149 return 0;
150
151 if (add_uevent_var(env, "nchans=%d", mdev->nrbchan))
152 return -ENOMEM;
153
154 return 0;
155}
156#endif
157
158static void mISDN_class_release(struct class *cls)
159{
160
161}
162
163static struct class mISDN_class = {
164 .name = "mISDN",
165 .owner = THIS_MODULE,
166#ifdef CONFIG_HOTPLUG
167 .dev_uevent = mISDN_uevent,
168#endif
169 .dev_attrs = mISDN_dev_attrs,
170 .dev_release = mISDN_dev_release,
171 .class_release = mISDN_class_release,
172};
173
174static int
175_get_mdevice(struct device *dev, void *id)
176{
177 struct mISDNdevice *mdev = dev_to_mISDN(dev);
178
179 if (!mdev)
180 return 0;
181 if (mdev->id != *(u_int *)id)
182 return 0;
183 return 1;
184}
185
186struct mISDNdevice
187*get_mdevice(u_int id)
188{
189 return dev_to_mISDN(class_find_device(&mISDN_class, NULL, &id,
190 _get_mdevice));
191}
192
193static int
194_get_mdevice_count(struct device *dev, void *cnt)
195{
196 *(int *)cnt += 1;
197 return 0;
198}
199
200int
201get_mdevice_count(void)
202{
203 int cnt = 0;
204
205 class_for_each_device(&mISDN_class, NULL, &cnt, _get_mdevice_count);
206 return cnt;
207}
208
209static int
210get_free_devid(void)
211{
212 u_int i;
213
214 for (i = 0; i <= MAX_DEVICE_ID; i++)
215 if (!test_and_set_bit(i, (u_long *)&device_ids))
216 break;
217 if (i > MAX_DEVICE_ID)
218 return -EBUSY;
219 return i;
220}
221
222int
223mISDN_register_device(struct mISDNdevice *dev,
224 struct device *parent, char *name)
225{
226 int err;
227
228 err = get_free_devid();
229 if (err < 0)
230 goto error1;
231 dev->id = err;
232
233 device_initialize(&dev->dev);
234 if (name && name[0])
235 dev_set_name(&dev->dev, "%s", name);
236 else
237 dev_set_name(&dev->dev, "mISDN%d", dev->id);
238 if (debug & DEBUG_CORE)
239 printk(KERN_DEBUG "mISDN_register %s %d\n",
240 dev_name(&dev->dev), dev->id);
241 err = create_stack(dev);
242 if (err)
243 goto error1;
244
245 dev->dev.class = &mISDN_class;
246 dev->dev.platform_data = dev;
247 dev->dev.parent = parent;
248 dev_set_drvdata(&dev->dev, dev);
249
250 err = device_add(&dev->dev);
251 if (err)
252 goto error3;
253 return 0;
254
255error3:
256 delete_stack(dev);
257 return err;
258error1:
259 return err;
260
261}
262EXPORT_SYMBOL(mISDN_register_device);
263
264void
265mISDN_unregister_device(struct mISDNdevice *dev) {
266 if (debug & DEBUG_CORE)
267 printk(KERN_DEBUG "mISDN_unregister %s %d\n",
268 dev_name(&dev->dev), dev->id);
269
270 device_del(&dev->dev);
271 dev_set_drvdata(&dev->dev, NULL);
272
273 test_and_clear_bit(dev->id, (u_long *)&device_ids);
274 delete_stack(dev);
275 put_device(&dev->dev);
276}
277EXPORT_SYMBOL(mISDN_unregister_device);
278
279u_int
280get_all_Bprotocols(void)
281{
282 struct Bprotocol *bp;
283 u_int m = 0;
284
285 read_lock(&bp_lock);
286 list_for_each_entry(bp, &Bprotocols, list)
287 m |= bp->Bprotocols;
288 read_unlock(&bp_lock);
289 return m;
290}
291
292struct Bprotocol *
293get_Bprotocol4mask(u_int m)
294{
295 struct Bprotocol *bp;
296
297 read_lock(&bp_lock);
298 list_for_each_entry(bp, &Bprotocols, list)
299 if (bp->Bprotocols & m) {
300 read_unlock(&bp_lock);
301 return bp;
302 }
303 read_unlock(&bp_lock);
304 return NULL;
305}
306
307struct Bprotocol *
308get_Bprotocol4id(u_int id)
309{
310 u_int m;
311
312 if (id < ISDN_P_B_START || id > 63) {
313 printk(KERN_WARNING "%s id not in range %d\n",
314 __func__, id);
315 return NULL;
316 }
317 m = 1 << (id & ISDN_P_B_MASK);
318 return get_Bprotocol4mask(m);
319}
320
321int
322mISDN_register_Bprotocol(struct Bprotocol *bp)
323{
324 u_long flags;
325 struct Bprotocol *old;
326
327 if (debug & DEBUG_CORE)
328 printk(KERN_DEBUG "%s: %s/%x\n", __func__,
329 bp->name, bp->Bprotocols);
330 old = get_Bprotocol4mask(bp->Bprotocols);
331 if (old) {
332 printk(KERN_WARNING
333 "register duplicate protocol old %s/%x new %s/%x\n",
334 old->name, old->Bprotocols, bp->name, bp->Bprotocols);
335 return -EBUSY;
336 }
337 write_lock_irqsave(&bp_lock, flags);
338 list_add_tail(&bp->list, &Bprotocols);
339 write_unlock_irqrestore(&bp_lock, flags);
340 return 0;
341}
342EXPORT_SYMBOL(mISDN_register_Bprotocol);
343
344void
345mISDN_unregister_Bprotocol(struct Bprotocol *bp)
346{
347 u_long flags;
348
349 if (debug & DEBUG_CORE)
350 printk(KERN_DEBUG "%s: %s/%x\n", __func__, bp->name,
351 bp->Bprotocols);
352 write_lock_irqsave(&bp_lock, flags);
353 list_del(&bp->list);
354 write_unlock_irqrestore(&bp_lock, flags);
355}
356EXPORT_SYMBOL(mISDN_unregister_Bprotocol);
357
358static const char *msg_no_channel = "<no channel>";
359static const char *msg_no_stack = "<no stack>";
360static const char *msg_no_stackdev = "<no stack device>";
361
362const char *mISDNDevName4ch(struct mISDNchannel *ch)
363{
364 if (!ch)
365 return msg_no_channel;
366 if (!ch->st)
367 return msg_no_stack;
368 if (!ch->st->dev)
369 return msg_no_stackdev;
370 return dev_name(&ch->st->dev->dev);
371};
372EXPORT_SYMBOL(mISDNDevName4ch);
373
374static int
375mISDNInit(void)
376{
377 int err;
378
379 printk(KERN_INFO "Modular ISDN core version %d.%d.%d\n",
380 MISDN_MAJOR_VERSION, MISDN_MINOR_VERSION, MISDN_RELEASE);
381 mISDN_init_clock(&debug);
382 mISDN_initstack(&debug);
383 err = class_register(&mISDN_class);
384 if (err)
385 goto error1;
386 err = mISDN_inittimer(&debug);
387 if (err)
388 goto error2;
389 err = l1_init(&debug);
390 if (err)
391 goto error3;
392 err = Isdnl2_Init(&debug);
393 if (err)
394 goto error4;
395 err = misdn_sock_init(&debug);
396 if (err)
397 goto error5;
398 return 0;
399
400error5:
401 Isdnl2_cleanup();
402error4:
403 l1_cleanup();
404error3:
405 mISDN_timer_cleanup();
406error2:
407 class_unregister(&mISDN_class);
408error1:
409 return err;
410}
411
412static void mISDN_cleanup(void)
413{
414 misdn_sock_cleanup();
415 Isdnl2_cleanup();
416 l1_cleanup();
417 mISDN_timer_cleanup();
418 class_unregister(&mISDN_class);
419
420 printk(KERN_DEBUG "mISDNcore unloaded\n");
421}
422
423module_init(mISDNInit);
424module_exit(mISDN_cleanup);
425
