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

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