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TOMOYO Linux Cross Reference
Linux/net/irda/ircomm/ircomm_param.c

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  1 /*********************************************************************
  2  *
  3  * Filename:      ircomm_param.c
  4  * Version:       1.0
  5  * Description:   Parameter handling for the IrCOMM protocol
  6  * Status:        Experimental.
  7  * Author:        Dag Brattli <dagb@cs.uit.no>
  8  * Created at:    Mon Jun  7 10:25:11 1999
  9  * Modified at:   Sun Jan 30 14:32:03 2000
 10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
 11  *
 12  *     Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
 13  *
 14  *     This program is free software; you can redistribute it and/or
 15  *     modify it under the terms of the GNU General Public License as
 16  *     published by the Free Software Foundation; either version 2 of
 17  *     the License, or (at your option) any later version.
 18  *
 19  *     This program is distributed in the hope that it will be useful,
 20  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 21  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 22  *     GNU General Public License for more details.
 23  *
 24  *     You should have received a copy of the GNU General Public License
 25  *     along with this program; if not, see <http://www.gnu.org/licenses/>.
 26  *
 27  ********************************************************************/
 28 
 29 #include <linux/gfp.h>
 30 #include <linux/workqueue.h>
 31 #include <linux/interrupt.h>
 32 
 33 #include <net/irda/irda.h>
 34 #include <net/irda/parameters.h>
 35 
 36 #include <net/irda/ircomm_core.h>
 37 #include <net/irda/ircomm_tty_attach.h>
 38 #include <net/irda/ircomm_tty.h>
 39 
 40 #include <net/irda/ircomm_param.h>
 41 
 42 static int ircomm_param_service_type(void *instance, irda_param_t *param,
 43                                      int get);
 44 static int ircomm_param_port_type(void *instance, irda_param_t *param,
 45                                   int get);
 46 static int ircomm_param_port_name(void *instance, irda_param_t *param,
 47                                   int get);
 48 static int ircomm_param_service_type(void *instance, irda_param_t *param,
 49                                      int get);
 50 static int ircomm_param_data_rate(void *instance, irda_param_t *param,
 51                                   int get);
 52 static int ircomm_param_data_format(void *instance, irda_param_t *param,
 53                                     int get);
 54 static int ircomm_param_flow_control(void *instance, irda_param_t *param,
 55                                      int get);
 56 static int ircomm_param_xon_xoff(void *instance, irda_param_t *param, int get);
 57 static int ircomm_param_enq_ack(void *instance, irda_param_t *param, int get);
 58 static int ircomm_param_line_status(void *instance, irda_param_t *param,
 59                                     int get);
 60 static int ircomm_param_dte(void *instance, irda_param_t *param, int get);
 61 static int ircomm_param_dce(void *instance, irda_param_t *param, int get);
 62 static int ircomm_param_poll(void *instance, irda_param_t *param, int get);
 63 
 64 static pi_minor_info_t pi_minor_call_table_common[] = {
 65         { ircomm_param_service_type, PV_INT_8_BITS },
 66         { ircomm_param_port_type,    PV_INT_8_BITS },
 67         { ircomm_param_port_name,    PV_STRING }
 68 };
 69 static pi_minor_info_t pi_minor_call_table_non_raw[] = {
 70         { ircomm_param_data_rate,    PV_INT_32_BITS | PV_BIG_ENDIAN },
 71         { ircomm_param_data_format,  PV_INT_8_BITS },
 72         { ircomm_param_flow_control, PV_INT_8_BITS },
 73         { ircomm_param_xon_xoff,     PV_INT_16_BITS },
 74         { ircomm_param_enq_ack,      PV_INT_16_BITS },
 75         { ircomm_param_line_status,  PV_INT_8_BITS }
 76 };
 77 static pi_minor_info_t pi_minor_call_table_9_wire[] = {
 78         { ircomm_param_dte,          PV_INT_8_BITS },
 79         { ircomm_param_dce,          PV_INT_8_BITS },
 80         { ircomm_param_poll,         PV_NO_VALUE },
 81 };
 82 
 83 static pi_major_info_t pi_major_call_table[] = {
 84         { pi_minor_call_table_common,  3 },
 85         { pi_minor_call_table_non_raw, 6 },
 86         { pi_minor_call_table_9_wire,  3 }
 87 /*      { pi_minor_call_table_centronics }  */
 88 };
 89 
 90 pi_param_info_t ircomm_param_info = { pi_major_call_table, 3, 0x0f, 4 };
 91 
 92 /*
 93  * Function ircomm_param_request (self, pi, flush)
 94  *
 95  *    Queue a parameter for the control channel
 96  *
 97  */
 98 int ircomm_param_request(struct ircomm_tty_cb *self, __u8 pi, int flush)
 99 {
100         unsigned long flags;
101         struct sk_buff *skb;
102         int count;
103 
104         IRDA_DEBUG(2, "%s()\n", __func__ );
105 
106         IRDA_ASSERT(self != NULL, return -1;);
107         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
108 
109         /* Make sure we don't send parameters for raw mode */
110         if (self->service_type == IRCOMM_3_WIRE_RAW)
111                 return 0;
112 
113         spin_lock_irqsave(&self->spinlock, flags);
114 
115         skb = self->ctrl_skb;
116         if (!skb) {
117                 skb = alloc_skb(256, GFP_ATOMIC);
118                 if (!skb) {
119                         spin_unlock_irqrestore(&self->spinlock, flags);
120                         return -ENOMEM;
121                 }
122 
123                 skb_reserve(skb, self->max_header_size);
124                 self->ctrl_skb = skb;
125         }
126         /*
127          * Inserting is a little bit tricky since we don't know how much
128          * room we will need. But this should hopefully work OK
129          */
130         count = irda_param_insert(self, pi, skb_tail_pointer(skb),
131                                   skb_tailroom(skb), &ircomm_param_info);
132         if (count < 0) {
133                 IRDA_WARNING("%s(), no room for parameter!\n", __func__);
134                 spin_unlock_irqrestore(&self->spinlock, flags);
135                 return -1;
136         }
137         skb_put(skb, count);
138 
139         spin_unlock_irqrestore(&self->spinlock, flags);
140 
141         IRDA_DEBUG(2, "%s(), skb->len=%d\n", __func__ , skb->len);
142 
143         if (flush) {
144                 /* ircomm_tty_do_softint will take care of the rest */
145                 schedule_work(&self->tqueue);
146         }
147 
148         return count;
149 }
150 
151 /*
152  * Function ircomm_param_service_type (self, buf, len)
153  *
154  *    Handle service type, this function will both be called after the LM-IAS
155  *    query and then the remote device sends its initial parameters
156  *
157  */
158 static int ircomm_param_service_type(void *instance, irda_param_t *param,
159                                      int get)
160 {
161         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
162         __u8 service_type = (__u8) param->pv.i;
163 
164         IRDA_ASSERT(self != NULL, return -1;);
165         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
166 
167         if (get) {
168                 param->pv.i = self->settings.service_type;
169                 return 0;
170         }
171 
172         /* Find all common service types */
173         service_type &= self->service_type;
174         if (!service_type) {
175                 IRDA_DEBUG(2,
176                            "%s(), No common service type to use!\n", __func__ );
177                 return -1;
178         }
179         IRDA_DEBUG(0, "%s(), services in common=%02x\n", __func__ ,
180                    service_type);
181 
182         /*
183          * Now choose a preferred service type of those available
184          */
185         if (service_type & IRCOMM_CENTRONICS)
186                 self->settings.service_type = IRCOMM_CENTRONICS;
187         else if (service_type & IRCOMM_9_WIRE)
188                 self->settings.service_type = IRCOMM_9_WIRE;
189         else if (service_type & IRCOMM_3_WIRE)
190                 self->settings.service_type = IRCOMM_3_WIRE;
191         else if (service_type & IRCOMM_3_WIRE_RAW)
192                 self->settings.service_type = IRCOMM_3_WIRE_RAW;
193 
194         IRDA_DEBUG(0, "%s(), resulting service type=0x%02x\n", __func__ ,
195                    self->settings.service_type);
196 
197         /*
198          * Now the line is ready for some communication. Check if we are a
199          * server, and send over some initial parameters.
200          * Client do it in ircomm_tty_state_setup().
201          * Note : we may get called from ircomm_tty_getvalue_confirm(),
202          * therefore before we even have open any socket. And self->client
203          * is initialised to TRUE only later. So, we check if the link is
204          * really initialised. - Jean II
205          */
206         if ((self->max_header_size != IRCOMM_TTY_HDR_UNINITIALISED) &&
207             (!self->client) &&
208             (self->settings.service_type != IRCOMM_3_WIRE_RAW))
209         {
210                 /* Init connection */
211                 ircomm_tty_send_initial_parameters(self);
212                 ircomm_tty_link_established(self);
213         }
214 
215         return 0;
216 }
217 
218 /*
219  * Function ircomm_param_port_type (self, param)
220  *
221  *    The port type parameter tells if the devices are serial or parallel.
222  *    Since we only advertise serial service, this parameter should only
223  *    be equal to IRCOMM_SERIAL.
224  */
225 static int ircomm_param_port_type(void *instance, irda_param_t *param, int get)
226 {
227         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
228 
229         IRDA_ASSERT(self != NULL, return -1;);
230         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
231 
232         if (get)
233                 param->pv.i = IRCOMM_SERIAL;
234         else {
235                 self->settings.port_type = (__u8) param->pv.i;
236 
237                 IRDA_DEBUG(0, "%s(), port type=%d\n", __func__ ,
238                            self->settings.port_type);
239         }
240         return 0;
241 }
242 
243 /*
244  * Function ircomm_param_port_name (self, param)
245  *
246  *    Exchange port name
247  *
248  */
249 static int ircomm_param_port_name(void *instance, irda_param_t *param, int get)
250 {
251         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
252 
253         IRDA_ASSERT(self != NULL, return -1;);
254         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
255 
256         if (get) {
257                 IRDA_DEBUG(0, "%s(), not imp!\n", __func__ );
258         } else {
259                 IRDA_DEBUG(0, "%s(), port-name=%s\n", __func__ , param->pv.c);
260                 strncpy(self->settings.port_name, param->pv.c, 32);
261         }
262 
263         return 0;
264 }
265 
266 /*
267  * Function ircomm_param_data_rate (self, param)
268  *
269  *    Exchange data rate to be used in this settings
270  *
271  */
272 static int ircomm_param_data_rate(void *instance, irda_param_t *param, int get)
273 {
274         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
275 
276         IRDA_ASSERT(self != NULL, return -1;);
277         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
278 
279         if (get)
280                 param->pv.i = self->settings.data_rate;
281         else
282                 self->settings.data_rate = param->pv.i;
283 
284         IRDA_DEBUG(2, "%s(), data rate = %d\n", __func__ , param->pv.i);
285 
286         return 0;
287 }
288 
289 /*
290  * Function ircomm_param_data_format (self, param)
291  *
292  *    Exchange data format to be used in this settings
293  *
294  */
295 static int ircomm_param_data_format(void *instance, irda_param_t *param,
296                                     int get)
297 {
298         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
299 
300         IRDA_ASSERT(self != NULL, return -1;);
301         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
302 
303         if (get)
304                 param->pv.i = self->settings.data_format;
305         else
306                 self->settings.data_format = (__u8) param->pv.i;
307 
308         return 0;
309 }
310 
311 /*
312  * Function ircomm_param_flow_control (self, param)
313  *
314  *    Exchange flow control settings to be used in this settings
315  *
316  */
317 static int ircomm_param_flow_control(void *instance, irda_param_t *param,
318                                      int get)
319 {
320         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
321 
322         IRDA_ASSERT(self != NULL, return -1;);
323         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
324 
325         if (get)
326                 param->pv.i = self->settings.flow_control;
327         else
328                 self->settings.flow_control = (__u8) param->pv.i;
329 
330         IRDA_DEBUG(1, "%s(), flow control = 0x%02x\n", __func__ , (__u8) param->pv.i);
331 
332         return 0;
333 }
334 
335 /*
336  * Function ircomm_param_xon_xoff (self, param)
337  *
338  *    Exchange XON/XOFF characters
339  *
340  */
341 static int ircomm_param_xon_xoff(void *instance, irda_param_t *param, int get)
342 {
343         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
344 
345         IRDA_ASSERT(self != NULL, return -1;);
346         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
347 
348         if (get) {
349                 param->pv.i = self->settings.xonxoff[0];
350                 param->pv.i |= self->settings.xonxoff[1] << 8;
351         } else {
352                 self->settings.xonxoff[0] = (__u16) param->pv.i & 0xff;
353                 self->settings.xonxoff[1] = (__u16) param->pv.i >> 8;
354         }
355 
356         IRDA_DEBUG(0, "%s(), XON/XOFF = 0x%02x,0x%02x\n", __func__ ,
357                    param->pv.i & 0xff, param->pv.i >> 8);
358 
359         return 0;
360 }
361 
362 /*
363  * Function ircomm_param_enq_ack (self, param)
364  *
365  *    Exchange ENQ/ACK characters
366  *
367  */
368 static int ircomm_param_enq_ack(void *instance, irda_param_t *param, int get)
369 {
370         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
371 
372         IRDA_ASSERT(self != NULL, return -1;);
373         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
374 
375         if (get) {
376                 param->pv.i = self->settings.enqack[0];
377                 param->pv.i |= self->settings.enqack[1] << 8;
378         } else {
379                 self->settings.enqack[0] = (__u16) param->pv.i & 0xff;
380                 self->settings.enqack[1] = (__u16) param->pv.i >> 8;
381         }
382 
383         IRDA_DEBUG(0, "%s(), ENQ/ACK = 0x%02x,0x%02x\n", __func__ ,
384                    param->pv.i & 0xff, param->pv.i >> 8);
385 
386         return 0;
387 }
388 
389 /*
390  * Function ircomm_param_line_status (self, param)
391  *
392  *
393  *
394  */
395 static int ircomm_param_line_status(void *instance, irda_param_t *param,
396                                     int get)
397 {
398         IRDA_DEBUG(2, "%s(), not impl.\n", __func__ );
399 
400         return 0;
401 }
402 
403 /*
404  * Function ircomm_param_dte (instance, param)
405  *
406  *    If we get here, there must be some sort of null-modem connection, and
407  *    we are probably working in server mode as well.
408  */
409 static int ircomm_param_dte(void *instance, irda_param_t *param, int get)
410 {
411         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
412         __u8 dte;
413 
414         IRDA_ASSERT(self != NULL, return -1;);
415         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
416 
417         if (get)
418                 param->pv.i = self->settings.dte;
419         else {
420                 dte = (__u8) param->pv.i;
421 
422                 self->settings.dce = 0;
423 
424                 if (dte & IRCOMM_DELTA_DTR)
425                         self->settings.dce |= (IRCOMM_DELTA_DSR|
426                                               IRCOMM_DELTA_RI |
427                                               IRCOMM_DELTA_CD);
428                 if (dte & IRCOMM_DTR)
429                         self->settings.dce |= (IRCOMM_DSR|
430                                               IRCOMM_RI |
431                                               IRCOMM_CD);
432 
433                 if (dte & IRCOMM_DELTA_RTS)
434                         self->settings.dce |= IRCOMM_DELTA_CTS;
435                 if (dte & IRCOMM_RTS)
436                         self->settings.dce |= IRCOMM_CTS;
437 
438                 /* Take appropriate actions */
439                 ircomm_tty_check_modem_status(self);
440 
441                 /* Null modem cable emulator */
442                 self->settings.null_modem = TRUE;
443         }
444 
445         return 0;
446 }
447 
448 /*
449  * Function ircomm_param_dce (instance, param)
450  *
451  *
452  *
453  */
454 static int ircomm_param_dce(void *instance, irda_param_t *param, int get)
455 {
456         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
457         __u8 dce;
458 
459         IRDA_DEBUG(1, "%s(), dce = 0x%02x\n", __func__ , (__u8) param->pv.i);
460 
461         dce = (__u8) param->pv.i;
462 
463         IRDA_ASSERT(self != NULL, return -1;);
464         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
465 
466         self->settings.dce = dce;
467 
468         /* Check if any of the settings have changed */
469         if (dce & 0x0f) {
470                 if (dce & IRCOMM_DELTA_CTS) {
471                         IRDA_DEBUG(2, "%s(), CTS\n", __func__ );
472                 }
473         }
474 
475         ircomm_tty_check_modem_status(self);
476 
477         return 0;
478 }
479 
480 /*
481  * Function ircomm_param_poll (instance, param)
482  *
483  *    Called when the peer device is polling for the line settings
484  *
485  */
486 static int ircomm_param_poll(void *instance, irda_param_t *param, int get)
487 {
488         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
489 
490         IRDA_ASSERT(self != NULL, return -1;);
491         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
492 
493         /* Poll parameters are always of length 0 (just a signal) */
494         if (!get) {
495                 /* Respond with DTE line settings */
496                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
497         }
498         return 0;
499 }
500 
501 
502 
503 
504 
505 

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