[PATCH] remove many unneeded #includes of sched.h
[linux-2.6.git] / net / irda / ircomm / ircomm_core.c
1 /*********************************************************************
2  *
3  * Filename:      ircomm_core.c
4  * Version:       1.0
5  * Description:   IrCOMM service interface
6  * Status:        Experimental.
7  * Author:        Dag Brattli <dagb@cs.uit.no>
8  * Created at:    Sun Jun  6 20:37:34 1999
9  * Modified at:   Tue Dec 21 13:26:41 1999
10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
11  *
12  *     Copyright (c) 1999 Dag Brattli, All Rights Reserved.
13  *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
14  *
15  *     This program is free software; you can redistribute it and/or
16  *     modify it under the terms of the GNU General Public License as
17  *     published by the Free Software Foundation; either version 2 of
18  *     the License, or (at your option) any later version.
19  *
20  *     This program is distributed in the hope that it will be useful,
21  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
22  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23  *     GNU General Public License for more details.
24  *
25  *     You should have received a copy of the GNU General Public License
26  *     along with this program; if not, write to the Free Software
27  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28  *     MA 02111-1307 USA
29  *
30  ********************************************************************/
31
32 #include <linux/module.h>
33 #include <linux/proc_fs.h>
34 #include <linux/seq_file.h>
35 #include <linux/init.h>
36
37 #include <net/irda/irda.h>
38 #include <net/irda/irmod.h>
39 #include <net/irda/irlmp.h>
40 #include <net/irda/iriap.h>
41 #include <net/irda/irttp.h>
42 #include <net/irda/irias_object.h>
43
44 #include <net/irda/ircomm_event.h>
45 #include <net/irda/ircomm_lmp.h>
46 #include <net/irda/ircomm_ttp.h>
47 #include <net/irda/ircomm_param.h>
48 #include <net/irda/ircomm_core.h>
49
50 static int __ircomm_close(struct ircomm_cb *self);
51 static void ircomm_control_indication(struct ircomm_cb *self,
52                                       struct sk_buff *skb, int clen);
53
54 #ifdef CONFIG_PROC_FS
55 extern struct proc_dir_entry *proc_irda;
56 static int ircomm_seq_open(struct inode *, struct file *);
57
58 static const struct file_operations ircomm_proc_fops = {
59         .owner          = THIS_MODULE,
60         .open           = ircomm_seq_open,
61         .read           = seq_read,
62         .llseek         = seq_lseek,
63         .release        = seq_release,
64 };
65 #endif /* CONFIG_PROC_FS */
66
67 hashbin_t *ircomm = NULL;
68
69 static int __init ircomm_init(void)
70 {
71         ircomm = hashbin_new(HB_LOCK);
72         if (ircomm == NULL) {
73                 IRDA_ERROR("%s(), can't allocate hashbin!\n", __FUNCTION__);
74                 return -ENOMEM;
75         }
76
77 #ifdef CONFIG_PROC_FS
78         { struct proc_dir_entry *ent;
79         ent = create_proc_entry("ircomm", 0, proc_irda);
80         if (ent)
81                 ent->proc_fops = &ircomm_proc_fops;
82         }
83 #endif /* CONFIG_PROC_FS */
84
85         IRDA_MESSAGE("IrCOMM protocol (Dag Brattli)\n");
86
87         return 0;
88 }
89
90 static void __exit ircomm_cleanup(void)
91 {
92         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
93
94         hashbin_delete(ircomm, (FREE_FUNC) __ircomm_close);
95
96 #ifdef CONFIG_PROC_FS
97         remove_proc_entry("ircomm", proc_irda);
98 #endif /* CONFIG_PROC_FS */
99 }
100
101 /*
102  * Function ircomm_open (client_notify)
103  *
104  *    Start a new IrCOMM instance
105  *
106  */
107 struct ircomm_cb *ircomm_open(notify_t *notify, __u8 service_type, int line)
108 {
109         struct ircomm_cb *self = NULL;
110         int ret;
111
112         IRDA_DEBUG(2, "%s(), service_type=0x%02x\n", __FUNCTION__ ,
113                    service_type);
114
115         IRDA_ASSERT(ircomm != NULL, return NULL;);
116
117         self = kzalloc(sizeof(struct ircomm_cb), GFP_ATOMIC);
118         if (self == NULL)
119                 return NULL;
120
121         self->notify = *notify;
122         self->magic = IRCOMM_MAGIC;
123
124         /* Check if we should use IrLMP or IrTTP */
125         if (service_type & IRCOMM_3_WIRE_RAW) {
126                 self->flow_status = FLOW_START;
127                 ret = ircomm_open_lsap(self);
128         } else
129                 ret = ircomm_open_tsap(self);
130
131         if (ret < 0) {
132                 kfree(self);
133                 return NULL;
134         }
135
136         self->service_type = service_type;
137         self->line = line;
138
139         hashbin_insert(ircomm, (irda_queue_t *) self, line, NULL);
140
141         ircomm_next_state(self, IRCOMM_IDLE);
142
143         return self;
144 }
145
146 EXPORT_SYMBOL(ircomm_open);
147
148 /*
149  * Function ircomm_close_instance (self)
150  *
151  *    Remove IrCOMM instance
152  *
153  */
154 static int __ircomm_close(struct ircomm_cb *self)
155 {
156         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
157
158         /* Disconnect link if any */
159         ircomm_do_event(self, IRCOMM_DISCONNECT_REQUEST, NULL, NULL);
160
161         /* Remove TSAP */
162         if (self->tsap) {
163                 irttp_close_tsap(self->tsap);
164                 self->tsap = NULL;
165         }
166
167         /* Remove LSAP */
168         if (self->lsap) {
169                 irlmp_close_lsap(self->lsap);
170                 self->lsap = NULL;
171         }
172         self->magic = 0;
173
174         kfree(self);
175
176         return 0;
177 }
178
179 /*
180  * Function ircomm_close (self)
181  *
182  *    Closes and removes the specified IrCOMM instance
183  *
184  */
185 int ircomm_close(struct ircomm_cb *self)
186 {
187         struct ircomm_cb *entry;
188
189         IRDA_ASSERT(self != NULL, return -EIO;);
190         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -EIO;);
191
192         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
193
194         entry = hashbin_remove(ircomm, self->line, NULL);
195
196         IRDA_ASSERT(entry == self, return -1;);
197
198         return __ircomm_close(self);
199 }
200
201 EXPORT_SYMBOL(ircomm_close);
202
203 /*
204  * Function ircomm_connect_request (self, service_type)
205  *
206  *    Impl. of this function is differ from one of the reference. This
207  *    function does discovery as well as sending connect request
208  *
209  */
210 int ircomm_connect_request(struct ircomm_cb *self, __u8 dlsap_sel,
211                            __u32 saddr, __u32 daddr, struct sk_buff *skb,
212                            __u8 service_type)
213 {
214         struct ircomm_info info;
215         int ret;
216
217         IRDA_DEBUG(2 , "%s()\n", __FUNCTION__ );
218
219         IRDA_ASSERT(self != NULL, return -1;);
220         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
221
222         self->service_type= service_type;
223
224         info.dlsap_sel = dlsap_sel;
225         info.saddr = saddr;
226         info.daddr = daddr;
227
228         ret = ircomm_do_event(self, IRCOMM_CONNECT_REQUEST, skb, &info);
229
230         return ret;
231 }
232
233 EXPORT_SYMBOL(ircomm_connect_request);
234
235 /*
236  * Function ircomm_connect_indication (self, qos, skb)
237  *
238  *    Notify user layer about the incoming connection
239  *
240  */
241 void ircomm_connect_indication(struct ircomm_cb *self, struct sk_buff *skb,
242                                struct ircomm_info *info)
243 {
244         int clen = 0;
245
246         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
247
248         /* Check if the packet contains data on the control channel */
249         if (skb->len > 0)
250                 clen = skb->data[0];
251
252         /*
253          * If there are any data hiding in the control channel, we must
254          * deliver it first. The side effect is that the control channel
255          * will be removed from the skb
256          */
257         if (self->notify.connect_indication)
258                 self->notify.connect_indication(self->notify.instance, self,
259                                                 info->qos, info->max_data_size,
260                                                 info->max_header_size, skb);
261         else {
262                 IRDA_DEBUG(0, "%s(), missing handler\n", __FUNCTION__ );
263         }
264 }
265
266 /*
267  * Function ircomm_connect_response (self, userdata, max_sdu_size)
268  *
269  *    User accepts connection
270  *
271  */
272 int ircomm_connect_response(struct ircomm_cb *self, struct sk_buff *userdata)
273 {
274         int ret;
275
276         IRDA_ASSERT(self != NULL, return -1;);
277         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
278
279         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
280
281         ret = ircomm_do_event(self, IRCOMM_CONNECT_RESPONSE, userdata, NULL);
282
283         return ret;
284 }
285
286 EXPORT_SYMBOL(ircomm_connect_response);
287
288 /*
289  * Function connect_confirm (self, skb)
290  *
291  *    Notify user layer that the link is now connected
292  *
293  */
294 void ircomm_connect_confirm(struct ircomm_cb *self, struct sk_buff *skb,
295                             struct ircomm_info *info)
296 {
297         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
298
299         if (self->notify.connect_confirm )
300                 self->notify.connect_confirm(self->notify.instance,
301                                              self, info->qos,
302                                              info->max_data_size,
303                                              info->max_header_size, skb);
304         else {
305                 IRDA_DEBUG(0, "%s(), missing handler\n", __FUNCTION__ );
306         }
307 }
308
309 /*
310  * Function ircomm_data_request (self, userdata)
311  *
312  *    Send IrCOMM data to peer device
313  *
314  */
315 int ircomm_data_request(struct ircomm_cb *self, struct sk_buff *skb)
316 {
317         int ret;
318
319         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
320
321         IRDA_ASSERT(self != NULL, return -EFAULT;);
322         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -EFAULT;);
323         IRDA_ASSERT(skb != NULL, return -EFAULT;);
324
325         ret = ircomm_do_event(self, IRCOMM_DATA_REQUEST, skb, NULL);
326
327         return ret;
328 }
329
330 EXPORT_SYMBOL(ircomm_data_request);
331
332 /*
333  * Function ircomm_data_indication (self, skb)
334  *
335  *    Data arrived, so deliver it to user
336  *
337  */
338 void ircomm_data_indication(struct ircomm_cb *self, struct sk_buff *skb)
339 {
340         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
341
342         IRDA_ASSERT(skb->len > 0, return;);
343
344         if (self->notify.data_indication)
345                 self->notify.data_indication(self->notify.instance, self, skb);
346         else {
347                 IRDA_DEBUG(0, "%s(), missing handler\n", __FUNCTION__ );
348         }
349 }
350
351 /*
352  * Function ircomm_process_data (self, skb)
353  *
354  *    Data arrived which may contain control channel data
355  *
356  */
357 void ircomm_process_data(struct ircomm_cb *self, struct sk_buff *skb)
358 {
359         int clen;
360
361         IRDA_ASSERT(skb->len > 0, return;);
362
363         clen = skb->data[0];
364
365         /*
366          * If there are any data hiding in the control channel, we must
367          * deliver it first. The side effect is that the control channel
368          * will be removed from the skb
369          */
370         if (clen > 0)
371                 ircomm_control_indication(self, skb, clen);
372
373         /* Remove control channel from data channel */
374         skb_pull(skb, clen+1);
375
376         if (skb->len)
377                 ircomm_data_indication(self, skb);
378         else {
379                 IRDA_DEBUG(4, "%s(), data was control info only!\n",
380                            __FUNCTION__ );
381         }
382 }
383
384 /*
385  * Function ircomm_control_request (self, params)
386  *
387  *    Send control data to peer device
388  *
389  */
390 int ircomm_control_request(struct ircomm_cb *self, struct sk_buff *skb)
391 {
392         int ret;
393
394         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
395
396         IRDA_ASSERT(self != NULL, return -EFAULT;);
397         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -EFAULT;);
398         IRDA_ASSERT(skb != NULL, return -EFAULT;);
399
400         ret = ircomm_do_event(self, IRCOMM_CONTROL_REQUEST, skb, NULL);
401
402         return ret;
403 }
404
405 EXPORT_SYMBOL(ircomm_control_request);
406
407 /*
408  * Function ircomm_control_indication (self, skb)
409  *
410  *    Data has arrived on the control channel
411  *
412  */
413 static void ircomm_control_indication(struct ircomm_cb *self,
414                                       struct sk_buff *skb, int clen)
415 {
416         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
417
418         /* Use udata for delivering data on the control channel */
419         if (self->notify.udata_indication) {
420                 struct sk_buff *ctrl_skb;
421
422                 /* We don't own the skb, so clone it */
423                 ctrl_skb = skb_clone(skb, GFP_ATOMIC);
424                 if (!ctrl_skb)
425                         return;
426
427                 /* Remove data channel from control channel */
428                 skb_trim(ctrl_skb, clen+1);
429
430                 self->notify.udata_indication(self->notify.instance, self,
431                                               ctrl_skb);
432
433                 /* Drop reference count -
434                  * see ircomm_tty_control_indication(). */
435                 dev_kfree_skb(ctrl_skb);
436         } else {
437                 IRDA_DEBUG(0, "%s(), missing handler\n", __FUNCTION__ );
438         }
439 }
440
441 /*
442  * Function ircomm_disconnect_request (self, userdata, priority)
443  *
444  *    User layer wants to disconnect the IrCOMM connection
445  *
446  */
447 int ircomm_disconnect_request(struct ircomm_cb *self, struct sk_buff *userdata)
448 {
449         struct ircomm_info info;
450         int ret;
451
452         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
453
454         IRDA_ASSERT(self != NULL, return -1;);
455         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
456
457         ret = ircomm_do_event(self, IRCOMM_DISCONNECT_REQUEST, userdata,
458                               &info);
459         return ret;
460 }
461
462 EXPORT_SYMBOL(ircomm_disconnect_request);
463
464 /*
465  * Function disconnect_indication (self, skb)
466  *
467  *    Tell user that the link has been disconnected
468  *
469  */
470 void ircomm_disconnect_indication(struct ircomm_cb *self, struct sk_buff *skb,
471                                   struct ircomm_info *info)
472 {
473         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
474
475         IRDA_ASSERT(info != NULL, return;);
476
477         if (self->notify.disconnect_indication) {
478                 self->notify.disconnect_indication(self->notify.instance, self,
479                                                    info->reason, skb);
480         } else {
481                 IRDA_DEBUG(0, "%s(), missing handler\n", __FUNCTION__ );
482         }
483 }
484
485 /*
486  * Function ircomm_flow_request (self, flow)
487  *
488  *
489  *
490  */
491 void ircomm_flow_request(struct ircomm_cb *self, LOCAL_FLOW flow)
492 {
493         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
494
495         IRDA_ASSERT(self != NULL, return;);
496         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
497
498         if (self->service_type == IRCOMM_3_WIRE_RAW)
499                 return;
500
501         irttp_flow_request(self->tsap, flow);
502 }
503
504 EXPORT_SYMBOL(ircomm_flow_request);
505
506 #ifdef CONFIG_PROC_FS
507 static void *ircomm_seq_start(struct seq_file *seq, loff_t *pos)
508 {
509         struct ircomm_cb *self;
510         loff_t off = 0;
511
512         spin_lock_irq(&ircomm->hb_spinlock);
513
514         for (self = (struct ircomm_cb *) hashbin_get_first(ircomm);
515              self != NULL;
516              self = (struct ircomm_cb *) hashbin_get_next(ircomm)) {
517                 if (off++ == *pos)
518                         break;
519
520         }
521         return self;
522 }
523
524 static void *ircomm_seq_next(struct seq_file *seq, void *v, loff_t *pos)
525 {
526         ++*pos;
527
528         return (void *) hashbin_get_next(ircomm);
529 }
530
531 static void ircomm_seq_stop(struct seq_file *seq, void *v)
532 {
533         spin_unlock_irq(&ircomm->hb_spinlock);
534 }
535
536 static int ircomm_seq_show(struct seq_file *seq, void *v)
537 {
538         const struct ircomm_cb *self = v;
539
540         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -EINVAL; );
541
542         if(self->line < 0x10)
543                 seq_printf(seq, "ircomm%d", self->line);
544         else
545                 seq_printf(seq, "irlpt%d", self->line - 0x10);
546
547         seq_printf(seq,
548                    " state: %s, slsap_sel: %#02x, dlsap_sel: %#02x, mode:",
549                    ircomm_state[ self->state],
550                    self->slsap_sel, self->dlsap_sel);
551
552         if(self->service_type & IRCOMM_3_WIRE_RAW)
553                 seq_printf(seq, " 3-wire-raw");
554         if(self->service_type & IRCOMM_3_WIRE)
555                 seq_printf(seq, " 3-wire");
556         if(self->service_type & IRCOMM_9_WIRE)
557                 seq_printf(seq, " 9-wire");
558         if(self->service_type & IRCOMM_CENTRONICS)
559                 seq_printf(seq, " Centronics");
560         seq_putc(seq, '\n');
561
562         return 0;
563 }
564
565 static struct seq_operations ircomm_seq_ops = {
566         .start  = ircomm_seq_start,
567         .next   = ircomm_seq_next,
568         .stop   = ircomm_seq_stop,
569         .show   = ircomm_seq_show,
570 };
571
572 static int ircomm_seq_open(struct inode *inode, struct file *file)
573 {
574         return seq_open(file, &ircomm_seq_ops);
575 }
576 #endif /* CONFIG_PROC_FS */
577
578 MODULE_AUTHOR("Dag Brattli <dag@brattli.net>");
579 MODULE_DESCRIPTION("IrCOMM protocol");
580 MODULE_LICENSE("GPL");
581
582 module_init(ircomm_init);
583 module_exit(ircomm_cleanup);