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