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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, write to the Free Software
 26  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 27  *     MA 02111-1307 USA
 28  *
 29  ********************************************************************/
 30 
 31 #include <linux/workqueue.h>
 32 #include <linux/interrupt.h>
 33 
 34 #include <net/irda/irda.h>
 35 #include <net/irda/parameters.h>
 36 
 37 #include <net/irda/ircomm_core.h>
 38 #include <net/irda/ircomm_tty_attach.h>
 39 #include <net/irda/ircomm_tty.h>
 40 
 41 #include <net/irda/ircomm_param.h>
 42 
 43 static int ircomm_param_service_type(void *instance, irda_param_t *param,
 44                                      int get);
 45 static int ircomm_param_port_type(void *instance, irda_param_t *param,
 46                                   int get);
 47 static int ircomm_param_port_name(void *instance, irda_param_t *param,
 48                                   int get);
 49 static int ircomm_param_service_type(void *instance, irda_param_t *param,
 50                                      int get);
 51 static int ircomm_param_data_rate(void *instance, irda_param_t *param,
 52                                   int get);
 53 static int ircomm_param_data_format(void *instance, irda_param_t *param,
 54                                     int get);
 55 static int ircomm_param_flow_control(void *instance, irda_param_t *param,
 56                                      int get);
 57 static int ircomm_param_xon_xoff(void *instance, irda_param_t *param, int get);
 58 static int ircomm_param_enq_ack(void *instance, irda_param_t *param, int get);
 59 static int ircomm_param_line_status(void *instance, irda_param_t *param,
 60                                     int get);
 61 static int ircomm_param_dte(void *instance, irda_param_t *param, int get);
 62 static int ircomm_param_dce(void *instance, irda_param_t *param, int get);
 63 static int ircomm_param_poll(void *instance, irda_param_t *param, int get);
 64 
 65 static pi_minor_info_t pi_minor_call_table_common[] = {
 66         { ircomm_param_service_type, PV_INT_8_BITS },
 67         { ircomm_param_port_type,    PV_INT_8_BITS },
 68         { ircomm_param_port_name,    PV_STRING }
 69 };
 70 static pi_minor_info_t pi_minor_call_table_non_raw[] = {
 71         { ircomm_param_data_rate,    PV_INT_32_BITS | PV_BIG_ENDIAN },
 72         { ircomm_param_data_format,  PV_INT_8_BITS },
 73         { ircomm_param_flow_control, PV_INT_8_BITS },
 74         { ircomm_param_xon_xoff,     PV_INT_16_BITS },
 75         { ircomm_param_enq_ack,      PV_INT_16_BITS },
 76         { ircomm_param_line_status,  PV_INT_8_BITS }
 77 };
 78 static pi_minor_info_t pi_minor_call_table_9_wire[] = {
 79         { ircomm_param_dte,          PV_INT_8_BITS },
 80         { ircomm_param_dce,          PV_INT_8_BITS },
 81         { ircomm_param_poll,         PV_NO_VALUE },
 82 };
 83 
 84 static pi_major_info_t pi_major_call_table[] = {
 85         { pi_minor_call_table_common,  3 },
 86         { pi_minor_call_table_non_raw, 6 },
 87         { pi_minor_call_table_9_wire,  3 }
 88 /*      { pi_minor_call_table_centronics }  */
 89 };
 90 
 91 pi_param_info_t ircomm_param_info = { pi_major_call_table, 3, 0x0f, 4 };
 92 
 93 /*
 94  * Function ircomm_param_request (self, pi, flush)
 95  *
 96  *    Queue a parameter for the control channel
 97  *
 98  */
 99 int ircomm_param_request(struct ircomm_tty_cb *self, __u8 pi, int flush)
100 {
101         struct tty_struct *tty;
102         unsigned long flags;
103         struct sk_buff *skb;
104         int count;
105 
106         IRDA_DEBUG(2, "%s()\n", __func__ );
107 
108         IRDA_ASSERT(self != NULL, return -1;);
109         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
110 
111         tty = self->tty;
112         if (!tty)
113                 return 0;
114 
115         /* Make sure we don't send parameters for raw mode */
116         if (self->service_type == IRCOMM_3_WIRE_RAW)
117                 return 0;
118 
119         spin_lock_irqsave(&self->spinlock, flags);
120 
121         skb = self->ctrl_skb;
122         if (!skb) {
123                 skb = alloc_skb(256, GFP_ATOMIC);
124                 if (!skb) {
125                         spin_unlock_irqrestore(&self->spinlock, flags);
126                         return -ENOMEM;
127                 }
128 
129                 skb_reserve(skb, self->max_header_size);
130                 self->ctrl_skb = skb;
131         }
132         /*
133          * Inserting is a little bit tricky since we don't know how much
134          * room we will need. But this should hopefully work OK
135          */
136         count = irda_param_insert(self, pi, skb_tail_pointer(skb),
137                                   skb_tailroom(skb), &ircomm_param_info);
138         if (count < 0) {
139                 IRDA_WARNING("%s(), no room for parameter!\n", __func__);
140                 spin_unlock_irqrestore(&self->spinlock, flags);
141                 return -1;
142         }
143         skb_put(skb, count);
144 
145         spin_unlock_irqrestore(&self->spinlock, flags);
146 
147         IRDA_DEBUG(2, "%s(), skb->len=%d\n", __func__ , skb->len);
148 
149         if (flush) {
150                 /* ircomm_tty_do_softint will take care of the rest */
151                 schedule_work(&self->tqueue);
152         }
153 
154         return count;
155 }
156 
157 /*
158  * Function ircomm_param_service_type (self, buf, len)
159  *
160  *    Handle service type, this function will both be called after the LM-IAS
161  *    query and then the remote device sends its initial parameters
162  *
163  */
164 static int ircomm_param_service_type(void *instance, irda_param_t *param,
165                                      int get)
166 {
167         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
168         __u8 service_type = (__u8) param->pv.i;
169 
170         IRDA_ASSERT(self != NULL, return -1;);
171         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
172 
173         if (get) {
174                 param->pv.i = self->settings.service_type;
175                 return 0;
176         }
177 
178         /* Find all common service types */
179         service_type &= self->service_type;
180         if (!service_type) {
181                 IRDA_DEBUG(2,
182                            "%s(), No common service type to use!\n", __func__ );
183                 return -1;
184         }
185         IRDA_DEBUG(0, "%s(), services in common=%02x\n", __func__ ,
186                    service_type);
187 
188         /*
189          * Now choose a preferred service type of those available
190          */
191         if (service_type & IRCOMM_CENTRONICS)
192                 self->settings.service_type = IRCOMM_CENTRONICS;
193         else if (service_type & IRCOMM_9_WIRE)
194                 self->settings.service_type = IRCOMM_9_WIRE;
195         else if (service_type & IRCOMM_3_WIRE)
196                 self->settings.service_type = IRCOMM_3_WIRE;
197         else if (service_type & IRCOMM_3_WIRE_RAW)
198                 self->settings.service_type = IRCOMM_3_WIRE_RAW;
199 
200         IRDA_DEBUG(0, "%s(), resulting service type=0x%02x\n", __func__ ,
201                    self->settings.service_type);
202 
203         /*
204          * Now the line is ready for some communication. Check if we are a
205          * server, and send over some initial parameters.
206          * Client do it in ircomm_tty_state_setup().
207          * Note : we may get called from ircomm_tty_getvalue_confirm(),
208          * therefore before we even have open any socket. And self->client
209          * is initialised to TRUE only later. So, we check if the link is
210          * really initialised. - Jean II
211          */
212         if ((self->max_header_size != IRCOMM_TTY_HDR_UNINITIALISED) &&
213             (!self->client) &&
214             (self->settings.service_type != IRCOMM_3_WIRE_RAW))
215         {
216                 /* Init connection */
217                 ircomm_tty_send_initial_parameters(self);
218                 ircomm_tty_link_established(self);
219         }
220 
221         return 0;
222 }
223 
224 /*
225  * Function ircomm_param_port_type (self, param)
226  *
227  *    The port type parameter tells if the devices are serial or parallel.
228  *    Since we only advertise serial service, this parameter should only
229  *    be equal to IRCOMM_SERIAL.
230  */
231 static int ircomm_param_port_type(void *instance, irda_param_t *param, int get)
232 {
233         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
234 
235         IRDA_ASSERT(self != NULL, return -1;);
236         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
237 
238         if (get)
239                 param->pv.i = IRCOMM_SERIAL;
240         else {
241                 self->settings.port_type = (__u8) param->pv.i;
242 
243                 IRDA_DEBUG(0, "%s(), port type=%d\n", __func__ ,
244                            self->settings.port_type);
245         }
246         return 0;
247 }
248 
249 /*
250  * Function ircomm_param_port_name (self, param)
251  *
252  *    Exchange port name
253  *
254  */
255 static int ircomm_param_port_name(void *instance, irda_param_t *param, int get)
256 {
257         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
258 
259         IRDA_ASSERT(self != NULL, return -1;);
260         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
261 
262         if (get) {
263                 IRDA_DEBUG(0, "%s(), not imp!\n", __func__ );
264         } else {
265                 IRDA_DEBUG(0, "%s(), port-name=%s\n", __func__ , param->pv.c);
266                 strncpy(self->settings.port_name, param->pv.c, 32);
267         }
268 
269         return 0;
270 }
271 
272 /*
273  * Function ircomm_param_data_rate (self, param)
274  *
275  *    Exchange data rate to be used in this settings
276  *
277  */
278 static int ircomm_param_data_rate(void *instance, irda_param_t *param, int get)
279 {
280         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
281 
282         IRDA_ASSERT(self != NULL, return -1;);
283         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
284 
285         if (get)
286                 param->pv.i = self->settings.data_rate;
287         else
288                 self->settings.data_rate = param->pv.i;
289 
290         IRDA_DEBUG(2, "%s(), data rate = %d\n", __func__ , param->pv.i);
291 
292         return 0;
293 }
294 
295 /*
296  * Function ircomm_param_data_format (self, param)
297  *
298  *    Exchange data format to be used in this settings
299  *
300  */
301 static int ircomm_param_data_format(void *instance, irda_param_t *param,
302                                     int get)
303 {
304         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
305 
306         IRDA_ASSERT(self != NULL, return -1;);
307         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
308 
309         if (get)
310                 param->pv.i = self->settings.data_format;
311         else
312                 self->settings.data_format = (__u8) param->pv.i;
313 
314         return 0;
315 }
316 
317 /*
318  * Function ircomm_param_flow_control (self, param)
319  *
320  *    Exchange flow control settings to be used in this settings
321  *
322  */
323 static int ircomm_param_flow_control(void *instance, irda_param_t *param,
324                                      int get)
325 {
326         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
327 
328         IRDA_ASSERT(self != NULL, return -1;);
329         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
330 
331         if (get)
332                 param->pv.i = self->settings.flow_control;
333         else
334                 self->settings.flow_control = (__u8) param->pv.i;
335 
336         IRDA_DEBUG(1, "%s(), flow control = 0x%02x\n", __func__ , (__u8) param->pv.i);
337 
338         return 0;
339 }
340 
341 /*
342  * Function ircomm_param_xon_xoff (self, param)
343  *
344  *    Exchange XON/XOFF characters
345  *
346  */
347 static int ircomm_param_xon_xoff(void *instance, irda_param_t *param, int get)
348 {
349         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
350 
351         IRDA_ASSERT(self != NULL, return -1;);
352         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
353 
354         if (get) {
355                 param->pv.i = self->settings.xonxoff[0];
356                 param->pv.i |= self->settings.xonxoff[1] << 8;
357         } else {
358                 self->settings.xonxoff[0] = (__u16) param->pv.i & 0xff;
359                 self->settings.xonxoff[1] = (__u16) param->pv.i >> 8;
360         }
361 
362         IRDA_DEBUG(0, "%s(), XON/XOFF = 0x%02x,0x%02x\n", __func__ ,
363                    param->pv.i & 0xff, param->pv.i >> 8);
364 
365         return 0;
366 }
367 
368 /*
369  * Function ircomm_param_enq_ack (self, param)
370  *
371  *    Exchange ENQ/ACK characters
372  *
373  */
374 static int ircomm_param_enq_ack(void *instance, irda_param_t *param, int get)
375 {
376         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
377 
378         IRDA_ASSERT(self != NULL, return -1;);
379         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
380 
381         if (get) {
382                 param->pv.i = self->settings.enqack[0];
383                 param->pv.i |= self->settings.enqack[1] << 8;
384         } else {
385                 self->settings.enqack[0] = (__u16) param->pv.i & 0xff;
386                 self->settings.enqack[1] = (__u16) param->pv.i >> 8;
387         }
388 
389         IRDA_DEBUG(0, "%s(), ENQ/ACK = 0x%02x,0x%02x\n", __func__ ,
390                    param->pv.i & 0xff, param->pv.i >> 8);
391 
392         return 0;
393 }
394 
395 /*
396  * Function ircomm_param_line_status (self, param)
397  *
398  *
399  *
400  */
401 static int ircomm_param_line_status(void *instance, irda_param_t *param,
402                                     int get)
403 {
404         IRDA_DEBUG(2, "%s(), not impl.\n", __func__ );
405 
406         return 0;
407 }
408 
409 /*
410  * Function ircomm_param_dte (instance, param)
411  *
412  *    If we get here, there must be some sort of null-modem connection, and
413  *    we are probably working in server mode as well.
414  */
415 static int ircomm_param_dte(void *instance, irda_param_t *param, int get)
416 {
417         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
418         __u8 dte;
419 
420         IRDA_ASSERT(self != NULL, return -1;);
421         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
422 
423         if (get)
424                 param->pv.i = self->settings.dte;
425         else {
426                 dte = (__u8) param->pv.i;
427 
428                 self->settings.dce = 0;
429 
430                 if (dte & IRCOMM_DELTA_DTR)
431                         self->settings.dce |= (IRCOMM_DELTA_DSR|
432                                               IRCOMM_DELTA_RI |
433                                               IRCOMM_DELTA_CD);
434                 if (dte & IRCOMM_DTR)
435                         self->settings.dce |= (IRCOMM_DSR|
436                                               IRCOMM_RI |
437                                               IRCOMM_CD);
438 
439                 if (dte & IRCOMM_DELTA_RTS)
440                         self->settings.dce |= IRCOMM_DELTA_CTS;
441                 if (dte & IRCOMM_RTS)
442                         self->settings.dce |= IRCOMM_CTS;
443 
444                 /* Take appropriate actions */
445                 ircomm_tty_check_modem_status(self);
446 
447                 /* Null modem cable emulator */
448                 self->settings.null_modem = TRUE;
449         }
450 
451         return 0;
452 }
453 
454 /*
455  * Function ircomm_param_dce (instance, param)
456  *
457  *
458  *
459  */
460 static int ircomm_param_dce(void *instance, irda_param_t *param, int get)
461 {
462         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
463         __u8 dce;
464 
465         IRDA_DEBUG(1, "%s(), dce = 0x%02x\n", __func__ , (__u8) param->pv.i);
466 
467         dce = (__u8) param->pv.i;
468 
469         IRDA_ASSERT(self != NULL, return -1;);
470         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
471 
472         self->settings.dce = dce;
473 
474         /* Check if any of the settings have changed */
475         if (dce & 0x0f) {
476                 if (dce & IRCOMM_DELTA_CTS) {
477                         IRDA_DEBUG(2, "%s(), CTS \n", __func__ );
478                 }
479         }
480 
481         ircomm_tty_check_modem_status(self);
482 
483         return 0;
484 }
485 
486 /*
487  * Function ircomm_param_poll (instance, param)
488  *
489  *    Called when the peer device is polling for the line settings
490  *
491  */
492 static int ircomm_param_poll(void *instance, irda_param_t *param, int get)
493 {
494         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
495 
496         IRDA_ASSERT(self != NULL, return -1;);
497         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
498 
499         /* Poll parameters are always of length 0 (just a signal) */
500         if (!get) {
501                 /* Respond with DTE line settings */
502                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
503         }
504         return 0;
505 }
506 
507 
508 
509 
510 
511 

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