Merge commit 'v2.6.27-rc8' into x86/setup
[linux-2.6] / net / irda / ircomm / ircomm_lmp.c
1 /*********************************************************************
2  *
3  * Filename:      ircomm_lmp.c
4  * Version:       1.0
5  * Description:   Interface between IrCOMM and IrLMP
6  * Status:        Stable
7  * Author:        Dag Brattli <dagb@cs.uit.no>
8  * Created at:    Sun Jun  6 20:48:27 1999
9  * Modified at:   Sun Dec 12 13:44:17 1999
10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
11  * Sources:       Previous IrLPT work by Thomas Davis
12  *
13  *     Copyright (c) 1999 Dag Brattli, All Rights Reserved.
14  *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
15  *
16  *     This program is free software; you can redistribute it and/or
17  *     modify it under the terms of the GNU General Public License as
18  *     published by the Free Software Foundation; either version 2 of
19  *     the License, or (at your option) any later version.
20  *
21  *     This program is distributed in the hope that it will be useful,
22  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
23  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24  *     GNU General Public License for more details.
25  *
26  *     You should have received a copy of the GNU General Public License
27  *     along with this program; if not, write to the Free Software
28  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29  *     MA 02111-1307 USA
30  *
31  ********************************************************************/
32
33 #include <linux/init.h>
34
35 #include <net/irda/irda.h>
36 #include <net/irda/irlmp.h>
37 #include <net/irda/iriap.h>
38 #include <net/irda/irda_device.h>       /* struct irda_skb_cb */
39
40 #include <net/irda/ircomm_event.h>
41 #include <net/irda/ircomm_lmp.h>
42
43
44 /*
45  * Function ircomm_lmp_connect_request (self, userdata)
46  *
47  *
48  *
49  */
50 static int ircomm_lmp_connect_request(struct ircomm_cb *self,
51                                       struct sk_buff *userdata,
52                                       struct ircomm_info *info)
53 {
54         int ret = 0;
55
56         IRDA_DEBUG(0, "%s()\n", __func__ );
57
58         /* Don't forget to refcount it - should be NULL anyway */
59         if(userdata)
60                 skb_get(userdata);
61
62         ret = irlmp_connect_request(self->lsap, info->dlsap_sel,
63                                     info->saddr, info->daddr, NULL, userdata);
64         return ret;
65 }
66
67 /*
68  * Function ircomm_lmp_connect_response (self, skb)
69  *
70  *
71  *
72  */
73 static int ircomm_lmp_connect_response(struct ircomm_cb *self,
74                                        struct sk_buff *userdata)
75 {
76         struct sk_buff *tx_skb;
77         int ret;
78
79         IRDA_DEBUG(0, "%s()\n", __func__ );
80
81         /* Any userdata supplied? */
82         if (userdata == NULL) {
83                 tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
84                 if (!tx_skb)
85                         return -ENOMEM;
86
87                 /* Reserve space for MUX and LAP header */
88                 skb_reserve(tx_skb, LMP_MAX_HEADER);
89         } else {
90                 /*
91                  *  Check that the client has reserved enough space for
92                  *  headers
93                  */
94                 IRDA_ASSERT(skb_headroom(userdata) >= LMP_MAX_HEADER,
95                             return -1;);
96
97                 /* Don't forget to refcount it - should be NULL anyway */
98                 skb_get(userdata);
99                 tx_skb = userdata;
100         }
101
102         ret = irlmp_connect_response(self->lsap, tx_skb);
103
104         return 0;
105 }
106
107 static int ircomm_lmp_disconnect_request(struct ircomm_cb *self,
108                                          struct sk_buff *userdata,
109                                          struct ircomm_info *info)
110 {
111         struct sk_buff *tx_skb;
112         int ret;
113
114         IRDA_DEBUG(0, "%s()\n", __func__ );
115
116         if (!userdata) {
117                 tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
118                 if (!tx_skb)
119                         return -ENOMEM;
120
121                 /*  Reserve space for MUX and LAP header */
122                 skb_reserve(tx_skb, LMP_MAX_HEADER);
123                 userdata = tx_skb;
124         } else {
125                 /* Don't forget to refcount it - should be NULL anyway */
126                 skb_get(userdata);
127         }
128
129         ret = irlmp_disconnect_request(self->lsap, userdata);
130
131         return ret;
132 }
133
134 /*
135  * Function ircomm_lmp_flow_control (skb)
136  *
137  *    This function is called when a data frame we have sent to IrLAP has
138  *    been deallocated. We do this to make sure we don't flood IrLAP with
139  *    frames, since we are not using the IrTTP flow control mechanism
140  */
141 static void ircomm_lmp_flow_control(struct sk_buff *skb)
142 {
143         struct irda_skb_cb *cb;
144         struct ircomm_cb *self;
145         int line;
146
147         IRDA_ASSERT(skb != NULL, return;);
148
149         cb = (struct irda_skb_cb *) skb->cb;
150
151         IRDA_DEBUG(2, "%s()\n", __func__ );
152
153         line = cb->line;
154
155         self = (struct ircomm_cb *) hashbin_lock_find(ircomm, line, NULL);
156         if (!self) {
157                 IRDA_DEBUG(2, "%s(), didn't find myself\n", __func__ );
158                 return;
159         }
160
161         IRDA_ASSERT(self != NULL, return;);
162         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
163
164         self->pkt_count--;
165
166         if ((self->pkt_count < 2) && (self->flow_status == FLOW_STOP)) {
167                 IRDA_DEBUG(2, "%s(), asking TTY to start again!\n", __func__ );
168                 self->flow_status = FLOW_START;
169                 if (self->notify.flow_indication)
170                         self->notify.flow_indication(self->notify.instance,
171                                                      self, FLOW_START);
172         }
173 }
174
175 /*
176  * Function ircomm_lmp_data_request (self, userdata)
177  *
178  *    Send data frame to peer device
179  *
180  */
181 static int ircomm_lmp_data_request(struct ircomm_cb *self,
182                                    struct sk_buff *skb,
183                                    int not_used)
184 {
185         struct irda_skb_cb *cb;
186         int ret;
187
188         IRDA_ASSERT(skb != NULL, return -1;);
189
190         cb = (struct irda_skb_cb *) skb->cb;
191
192         cb->line = self->line;
193
194         IRDA_DEBUG(4, "%s(), sending frame\n", __func__ );
195
196         /* Don't forget to refcount it - see ircomm_tty_do_softint() */
197         skb_get(skb);
198
199         skb->destructor = ircomm_lmp_flow_control;
200
201         if ((self->pkt_count++ > 7) && (self->flow_status == FLOW_START)) {
202                 IRDA_DEBUG(2, "%s(), asking TTY to slow down!\n", __func__ );
203                 self->flow_status = FLOW_STOP;
204                 if (self->notify.flow_indication)
205                         self->notify.flow_indication(self->notify.instance,
206                                                      self, FLOW_STOP);
207         }
208         ret = irlmp_data_request(self->lsap, skb);
209         if (ret) {
210                 IRDA_ERROR("%s(), failed\n", __func__);
211                 /* irlmp_data_request already free the packet */
212         }
213
214         return ret;
215 }
216
217 /*
218  * Function ircomm_lmp_data_indication (instance, sap, skb)
219  *
220  *    Incoming data which we must deliver to the state machine, to check
221  *    we are still connected.
222  */
223 static int ircomm_lmp_data_indication(void *instance, void *sap,
224                                       struct sk_buff *skb)
225 {
226         struct ircomm_cb *self = (struct ircomm_cb *) instance;
227
228         IRDA_DEBUG(4, "%s()\n", __func__ );
229
230         IRDA_ASSERT(self != NULL, return -1;);
231         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
232         IRDA_ASSERT(skb != NULL, return -1;);
233
234         ircomm_do_event(self, IRCOMM_LMP_DATA_INDICATION, skb, NULL);
235
236         /* Drop reference count - see ircomm_tty_data_indication(). */
237         dev_kfree_skb(skb);
238
239         return 0;
240 }
241
242 /*
243  * Function ircomm_lmp_connect_confirm (instance, sap, qos, max_sdu_size,
244  *                                       max_header_size, skb)
245  *
246  *    Connection has been confirmed by peer device
247  *
248  */
249 static void ircomm_lmp_connect_confirm(void *instance, void *sap,
250                                        struct qos_info *qos,
251                                        __u32 max_seg_size,
252                                        __u8 max_header_size,
253                                        struct sk_buff *skb)
254 {
255         struct ircomm_cb *self = (struct ircomm_cb *) instance;
256         struct ircomm_info info;
257
258         IRDA_DEBUG(0, "%s()\n", __func__ );
259
260         IRDA_ASSERT(self != NULL, return;);
261         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
262         IRDA_ASSERT(skb != NULL, return;);
263         IRDA_ASSERT(qos != NULL, return;);
264
265         info.max_data_size = max_seg_size;
266         info.max_header_size = max_header_size;
267         info.qos = qos;
268
269         ircomm_do_event(self, IRCOMM_LMP_CONNECT_CONFIRM, skb, &info);
270
271         /* Drop reference count - see ircomm_tty_connect_confirm(). */
272         dev_kfree_skb(skb);
273 }
274
275 /*
276  * Function ircomm_lmp_connect_indication (instance, sap, qos, max_sdu_size,
277  *                                         max_header_size, skb)
278  *
279  *    Peer device wants to make a connection with us
280  *
281  */
282 static void ircomm_lmp_connect_indication(void *instance, void *sap,
283                                           struct qos_info *qos,
284                                           __u32 max_seg_size,
285                                           __u8 max_header_size,
286                                           struct sk_buff *skb)
287 {
288         struct ircomm_cb *self = (struct ircomm_cb *)instance;
289         struct ircomm_info info;
290
291         IRDA_DEBUG(0, "%s()\n", __func__ );
292
293         IRDA_ASSERT(self != NULL, return;);
294         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
295         IRDA_ASSERT(skb != NULL, return;);
296         IRDA_ASSERT(qos != NULL, return;);
297
298         info.max_data_size = max_seg_size;
299         info.max_header_size = max_header_size;
300         info.qos = qos;
301
302         ircomm_do_event(self, IRCOMM_LMP_CONNECT_INDICATION, skb, &info);
303
304         /* Drop reference count - see ircomm_tty_connect_indication(). */
305         dev_kfree_skb(skb);
306 }
307
308 /*
309  * Function ircomm_lmp_disconnect_indication (instance, sap, reason, skb)
310  *
311  *    Peer device has closed the connection, or the link went down for some
312  *    other reason
313  */
314 static void ircomm_lmp_disconnect_indication(void *instance, void *sap,
315                                              LM_REASON reason,
316                                              struct sk_buff *skb)
317 {
318         struct ircomm_cb *self = (struct ircomm_cb *) instance;
319         struct ircomm_info info;
320
321         IRDA_DEBUG(0, "%s()\n", __func__ );
322
323         IRDA_ASSERT(self != NULL, return;);
324         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
325
326         info.reason = reason;
327
328         ircomm_do_event(self, IRCOMM_LMP_DISCONNECT_INDICATION, skb, &info);
329
330         /* Drop reference count - see ircomm_tty_disconnect_indication(). */
331         if(skb)
332                 dev_kfree_skb(skb);
333 }
334 /*
335  * Function ircomm_open_lsap (self)
336  *
337  *    Open LSAP. This function will only be used when using "raw" services
338  *
339  */
340 int ircomm_open_lsap(struct ircomm_cb *self)
341 {
342         notify_t notify;
343
344         IRDA_DEBUG(0, "%s()\n", __func__ );
345
346         /* Register callbacks */
347         irda_notify_init(&notify);
348         notify.data_indication       = ircomm_lmp_data_indication;
349         notify.connect_confirm       = ircomm_lmp_connect_confirm;
350         notify.connect_indication    = ircomm_lmp_connect_indication;
351         notify.disconnect_indication = ircomm_lmp_disconnect_indication;
352         notify.instance = self;
353         strlcpy(notify.name, "IrCOMM", sizeof(notify.name));
354
355         self->lsap = irlmp_open_lsap(LSAP_ANY, &notify, 0);
356         if (!self->lsap) {
357                 IRDA_DEBUG(0,"%sfailed to allocate tsap\n", __func__ );
358                 return -1;
359         }
360         self->slsap_sel = self->lsap->slsap_sel;
361
362         /*
363          *  Initialize the call-table for issuing commands
364          */
365         self->issue.data_request       = ircomm_lmp_data_request;
366         self->issue.connect_request    = ircomm_lmp_connect_request;
367         self->issue.connect_response   = ircomm_lmp_connect_response;
368         self->issue.disconnect_request = ircomm_lmp_disconnect_request;
369
370         return 0;
371 }