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6#include <linux/slab.h>
7#include <linux/types.h>
8#include <linux/stddef.h>
9#include <linux/module.h>
10#include <linux/spinlock.h>
11#include <linux/mISDNif.h>
12#include "core.h"
13
14static u_int debug;
15
16MODULE_AUTHOR("Karsten Keil");
17MODULE_LICENSE("GPL");
18module_param(debug, uint, S_IRUGO | S_IWUSR);
19
20static u64 device_ids;
21#define MAX_DEVICE_ID 63
22
23static LIST_HEAD(Bprotocols);
24static DEFINE_RWLOCK(bp_lock);
25
26static void mISDN_dev_release(struct device *dev)
27{
28
29}
30
31static ssize_t id_show(struct device *dev,
32 struct device_attribute *attr, char *buf)
33{
34 struct mISDNdevice *mdev = dev_to_mISDN(dev);
35
36 if (!mdev)
37 return -ENODEV;
38 return sprintf(buf, "%d\n", mdev->id);
39}
40static DEVICE_ATTR_RO(id);
41
42static ssize_t nrbchan_show(struct device *dev,
43 struct device_attribute *attr, char *buf)
44{
45 struct mISDNdevice *mdev = dev_to_mISDN(dev);
46
47 if (!mdev)
48 return -ENODEV;
49 return sprintf(buf, "%d\n", mdev->nrbchan);
50}
51static DEVICE_ATTR_RO(nrbchan);
52
53static ssize_t d_protocols_show(struct device *dev,
54 struct device_attribute *attr, char *buf)
55{
56 struct mISDNdevice *mdev = dev_to_mISDN(dev);
57
58 if (!mdev)
59 return -ENODEV;
60 return sprintf(buf, "%d\n", mdev->Dprotocols);
61}
62static DEVICE_ATTR_RO(d_protocols);
63
64static ssize_t b_protocols_show(struct device *dev,
65 struct device_attribute *attr, char *buf)
66{
67 struct mISDNdevice *mdev = dev_to_mISDN(dev);
68
69 if (!mdev)
70 return -ENODEV;
71 return sprintf(buf, "%d\n", mdev->Bprotocols | get_all_Bprotocols());
72}
73static DEVICE_ATTR_RO(b_protocols);
74
75static ssize_t protocol_show(struct device *dev,
76 struct device_attribute *attr, char *buf)
77{
78 struct mISDNdevice *mdev = dev_to_mISDN(dev);
79
80 if (!mdev)
81 return -ENODEV;
82 return sprintf(buf, "%d\n", mdev->D.protocol);
83}
84static DEVICE_ATTR_RO(protocol);
85
86static ssize_t name_show(struct device *dev,
87 struct device_attribute *attr, char *buf)
88{
89 strcpy(buf, dev_name(dev));
90 return strlen(buf);
91}
92static DEVICE_ATTR_RO(name);
93
94#if 0
95static ssize_t name_set(struct device *dev, struct device_attribute *attr,
96 const char *buf, size_t count)
97{
98 int err = 0;
99 char *out = kmalloc(count + 1, GFP_KERNEL);
100
101 if (!out)
102 return -ENOMEM;
103
104 memcpy(out, buf, count);
105 if (count && out[count - 1] == '\n')
106 out[--count] = 0;
107 if (count)
108 err = device_rename(dev, out);
109 kfree(out);
110
111 return (err < 0) ? err : count;
112}
113static DEVICE_ATTR_RW(name);
114#endif
115
116static ssize_t channelmap_show(struct device *dev,
117 struct device_attribute *attr, char *buf)
118{
119 struct mISDNdevice *mdev = dev_to_mISDN(dev);
120 char *bp = buf;
121 int i;
122
123 for (i = 0; i <= mdev->nrbchan; i++)
124 *bp++ = test_channelmap(i, mdev->channelmap) ? '1' : '0';
125
126 return bp - buf;
127}
128static DEVICE_ATTR_RO(channelmap);
129
130static struct attribute *mISDN_attrs[] = {
131 &dev_attr_id.attr,
132 &dev_attr_d_protocols.attr,
133 &dev_attr_b_protocols.attr,
134 &dev_attr_protocol.attr,
135 &dev_attr_channelmap.attr,
136 &dev_attr_nrbchan.attr,
137 &dev_attr_name.attr,
138 NULL,
139};
140ATTRIBUTE_GROUPS(mISDN);
141
142static int mISDN_uevent(struct device *dev, struct kobj_uevent_env *env)
143{
144 struct mISDNdevice *mdev = dev_to_mISDN(dev);
145
146 if (!mdev)
147 return 0;
148
149 if (add_uevent_var(env, "nchans=%d", mdev->nrbchan))
150 return -ENOMEM;
151
152 return 0;
153}
154
155static void mISDN_class_release(struct class *cls)
156{
157
158}
159
160static struct class mISDN_class = {
161 .name = "mISDN",
162 .owner = THIS_MODULE,
163 .dev_uevent = mISDN_uevent,
164 .dev_groups = mISDN_groups,
165 .dev_release = mISDN_dev_release,
166 .class_release = mISDN_class_release,
167};
168
169static int
170_get_mdevice(struct device *dev, const void *id)
171{
172 struct mISDNdevice *mdev = dev_to_mISDN(dev);
173
174 if (!mdev)
175 return 0;
176 if (mdev->id != *(const u_int *)id)
177 return 0;
178 return 1;
179}
180
181struct mISDNdevice
182*get_mdevice(u_int id)
183{
184 return dev_to_mISDN(class_find_device(&mISDN_class, NULL, &id,
185 _get_mdevice));
186}
187
188static int
189_get_mdevice_count(struct device *dev, void *cnt)
190{
191 *(int *)cnt += 1;
192 return 0;
193}
194
195int
196get_mdevice_count(void)
197{
198 int cnt = 0;
199
200 class_for_each_device(&mISDN_class, NULL, &cnt, _get_mdevice_count);
201 return cnt;
202}
203
204static int
205get_free_devid(void)
206{
207 u_int i;
208
209 for (i = 0; i <= MAX_DEVICE_ID; i++)
210 if (!test_and_set_bit(i, (u_long *)&device_ids))
211 break;
212 if (i > MAX_DEVICE_ID)
213 return -EBUSY;
214 return i;
215}
216
217int
218mISDN_register_device(struct mISDNdevice *dev,
219 struct device *parent, char *name)
220{
221 int err;
222
223 err = get_free_devid();
224 if (err < 0)
225 goto error1;
226 dev->id = err;
227
228 device_initialize(&dev->dev);
229 if (name && name[0])
230 dev_set_name(&dev->dev, "%s", name);
231 else
232 dev_set_name(&dev->dev, "mISDN%d", dev->id);
233 if (debug & DEBUG_CORE)
234 printk(KERN_DEBUG "mISDN_register %s %d\n",
235 dev_name(&dev->dev), dev->id);
236 err = create_stack(dev);
237 if (err)
238 goto error1;
239
240 dev->dev.class = &mISDN_class;
241 dev->dev.platform_data = dev;
242 dev->dev.parent = parent;
243 dev_set_drvdata(&dev->dev, dev);
244
245 err = device_add(&dev->dev);
246 if (err)
247 goto error3;
248 return 0;
249
250error3:
251 delete_stack(dev);
252 return err;
253error1:
254 return err;
255
256}
257EXPORT_SYMBOL(mISDN_register_device);
258
259void
260mISDN_unregister_device(struct mISDNdevice *dev) {
261 if (debug & DEBUG_CORE)
262 printk(KERN_DEBUG "mISDN_unregister %s %d\n",
263 dev_name(&dev->dev), dev->id);
264
265 device_del(&dev->dev);
266 dev_set_drvdata(&dev->dev, NULL);
267
268 test_and_clear_bit(dev->id, (u_long *)&device_ids);
269 delete_stack(dev);
270 put_device(&dev->dev);
271}
272EXPORT_SYMBOL(mISDN_unregister_device);
273
274u_int
275get_all_Bprotocols(void)
276{
277 struct Bprotocol *bp;
278 u_int m = 0;
279
280 read_lock(&bp_lock);
281 list_for_each_entry(bp, &Bprotocols, list)
282 m |= bp->Bprotocols;
283 read_unlock(&bp_lock);
284 return m;
285}
286
287struct Bprotocol *
288get_Bprotocol4mask(u_int m)
289{
290 struct Bprotocol *bp;
291
292 read_lock(&bp_lock);
293 list_for_each_entry(bp, &Bprotocols, list)
294 if (bp->Bprotocols & m) {
295 read_unlock(&bp_lock);
296 return bp;
297 }
298 read_unlock(&bp_lock);
299 return NULL;
300}
301
302struct Bprotocol *
303get_Bprotocol4id(u_int id)
304{
305 u_int m;
306
307 if (id < ISDN_P_B_START || id > 63) {
308 printk(KERN_WARNING "%s id not in range %d\n",
309 __func__, id);
310 return NULL;
311 }
312 m = 1 << (id & ISDN_P_B_MASK);
313 return get_Bprotocol4mask(m);
314}
315
316int
317mISDN_register_Bprotocol(struct Bprotocol *bp)
318{
319 u_long flags;
320 struct Bprotocol *old;
321
322 if (debug & DEBUG_CORE)
323 printk(KERN_DEBUG "%s: %s/%x\n", __func__,
324 bp->name, bp->Bprotocols);
325 old = get_Bprotocol4mask(bp->Bprotocols);
326 if (old) {
327 printk(KERN_WARNING
328 "register duplicate protocol old %s/%x new %s/%x\n",
329 old->name, old->Bprotocols, bp->name, bp->Bprotocols);
330 return -EBUSY;
331 }
332 write_lock_irqsave(&bp_lock, flags);
333 list_add_tail(&bp->list, &Bprotocols);
334 write_unlock_irqrestore(&bp_lock, flags);
335 return 0;
336}
337EXPORT_SYMBOL(mISDN_register_Bprotocol);
338
339void
340mISDN_unregister_Bprotocol(struct Bprotocol *bp)
341{
342 u_long flags;
343
344 if (debug & DEBUG_CORE)
345 printk(KERN_DEBUG "%s: %s/%x\n", __func__, bp->name,
346 bp->Bprotocols);
347 write_lock_irqsave(&bp_lock, flags);
348 list_del(&bp->list);
349 write_unlock_irqrestore(&bp_lock, flags);
350}
351EXPORT_SYMBOL(mISDN_unregister_Bprotocol);
352
353static const char *msg_no_channel = "<no channel>";
354static const char *msg_no_stack = "<no stack>";
355static const char *msg_no_stackdev = "<no stack device>";
356
357const char *mISDNDevName4ch(struct mISDNchannel *ch)
358{
359 if (!ch)
360 return msg_no_channel;
361 if (!ch->st)
362 return msg_no_stack;
363 if (!ch->st->dev)
364 return msg_no_stackdev;
365 return dev_name(&ch->st->dev->dev);
366};
367EXPORT_SYMBOL(mISDNDevName4ch);
368
369static int
370mISDNInit(void)
371{
372 int err;
373
374 printk(KERN_INFO "Modular ISDN core version %d.%d.%d\n",
375 MISDN_MAJOR_VERSION, MISDN_MINOR_VERSION, MISDN_RELEASE);
376 mISDN_init_clock(&debug);
377 mISDN_initstack(&debug);
378 err = class_register(&mISDN_class);
379 if (err)
380 goto error1;
381 err = mISDN_inittimer(&debug);
382 if (err)
383 goto error2;
384 err = l1_init(&debug);
385 if (err)
386 goto error3;
387 err = Isdnl2_Init(&debug);
388 if (err)
389 goto error4;
390 err = misdn_sock_init(&debug);
391 if (err)
392 goto error5;
393 return 0;
394
395error5:
396 Isdnl2_cleanup();
397error4:
398 l1_cleanup();
399error3:
400 mISDN_timer_cleanup();
401error2:
402 class_unregister(&mISDN_class);
403error1:
404 return err;
405}
406
407static void mISDN_cleanup(void)
408{
409 misdn_sock_cleanup();
410 Isdnl2_cleanup();
411 l1_cleanup();
412 mISDN_timer_cleanup();
413 class_unregister(&mISDN_class);
414
415 printk(KERN_DEBUG "mISDNcore unloaded\n");
416}
417
418module_init(mISDNInit);
419module_exit(mISDN_cleanup);
420
