aboutsummaryrefslogtreecommitdiff
path: root/net/irda/ircomm/ircomm_param.c
blob: fbac13e95b28826223f7470a823c50cd8b3f7668 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
/*********************************************************************
 *
 * Filename:      ircomm_param.c
 * Version:       1.0
 * Description:   Parameter handling for the IrCOMM protocol
 * Status:        Experimental.
 * Author:        Dag Brattli <dagb@cs.uit.no>
 * Created at:    Mon Jun  7 10:25:11 1999
 * Modified at:   Sun Jan 30 14:32:03 2000
 * Modified by:   Dag Brattli <dagb@cs.uit.no>
 *
 *     Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
 *
 *     This program is free software; you can redistribute it and/or
 *     modify it under the terms of the GNU General Public License as
 *     published by the Free Software Foundation; either version 2 of
 *     the License, or (at your option) any later version.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program; if not, write to the Free Software
 *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *     MA 02111-1307 USA
 *
 ********************************************************************/

#include <linux/sched.h>
#include <linux/workqueue.h>
#include <linux/interrupt.h>

#include <net/irda/irda.h>
#include <net/irda/parameters.h>

#include <net/irda/ircomm_core.h>
#include <net/irda/ircomm_tty_attach.h>
#include <net/irda/ircomm_tty.h>

#include <net/irda/ircomm_param.h>

static int ircomm_param_service_type(void *instance, irda_param_t *param,
				     int get);
static int ircomm_param_port_type(void *instance, irda_param_t *param,
				  int get);
static int ircomm_param_port_name(void *instance, irda_param_t *param,
				  int get);
static int ircomm_param_service_type(void *instance, irda_param_t *param,
				     int get);
static int ircomm_param_data_rate(void *instance, irda_param_t *param,
				  int get);
static int ircomm_param_data_format(void *instance, irda_param_t *param,
				    int get);
static int ircomm_param_flow_control(void *instance, irda_param_t *param,
				     int get);
static int ircomm_param_xon_xoff(void *instance, irda_param_t *param, int get);
static int ircomm_param_enq_ack(void *instance, irda_param_t *param, int get);
static int ircomm_param_line_status(void *instance, irda_param_t *param,
				    int get);
static int ircomm_param_dte(void *instance, irda_param_t *param, int get);
static int ircomm_param_dce(void *instance, irda_param_t *param, int get);
static int ircomm_param_poll(void *instance, irda_param_t *param, int get);

static pi_minor_info_t pi_minor_call_table_common[] = {
	{ ircomm_param_service_type, PV_INT_8_BITS },
	{ ircomm_param_port_type,    PV_INT_8_BITS },
	{ ircomm_param_port_name,    PV_STRING }
};
static pi_minor_info_t pi_minor_call_table_non_raw[] = {
	{ ircomm_param_data_rate,    PV_INT_32_BITS | PV_BIG_ENDIAN },
	{ ircomm_param_data_format,  PV_INT_8_BITS },
	{ ircomm_param_flow_control, PV_INT_8_BITS },
	{ ircomm_param_xon_xoff,     PV_INT_16_BITS },
	{ ircomm_param_enq_ack,      PV_INT_16_BITS },
	{ ircomm_param_line_status,  PV_INT_8_BITS }
};
static pi_minor_info_t pi_minor_call_table_9_wire[] = {
	{ ircomm_param_dte,          PV_INT_8_BITS },
	{ ircomm_param_dce,          PV_INT_8_BITS },
	{ ircomm_param_poll,         PV_NO_VALUE },
};

static pi_major_info_t pi_major_call_table[] = {
	{ pi_minor_call_table_common,  3 },
	{ pi_minor_call_table_non_raw, 6 },
	{ pi_minor_call_table_9_wire,  3 }
/* 	{ pi_minor_call_table_centronics }  */
};

pi_param_info_t ircomm_param_info = { pi_major_call_table, 3, 0x0f, 4 };

/*
 * Function ircomm_param_request (self, pi, flush)
 *
 *    Queue a parameter for the control channel
 *
 */
int ircomm_param_request(struct ircomm_tty_cb *self, __u8 pi, int flush)
{
	struct tty_struct *tty;
	unsigned long flags;
	struct sk_buff *skb;
	int count;

	IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

	IRDA_ASSERT(self != NULL, return -1;);
	IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);

	tty = self->tty;
	if (!tty)
		return 0;

	/* Make sure we don't send parameters for raw mode */
	if (self->service_type == IRCOMM_3_WIRE_RAW)
		return 0;

	spin_lock_irqsave(&self->spinlock, flags);

	skb = self->ctrl_skb;
	if (!skb) {
		skb = alloc_skb(256, GFP_ATOMIC);
		if (!skb) {
			spin_unlock_irqrestore(&self->spinlock, flags);
			return -ENOMEM;
		}

		skb_reserve(skb, self->max_header_size);
		self->ctrl_skb = skb;
	}
	/*
	 * Inserting is a little bit tricky since we don't know how much
	 * room we will need. But this should hopefully work OK
	 */
	count = irda_param_insert(self, pi, skb->tail, skb_tailroom(skb),
				  &ircomm_param_info);
	if (count < 0) {
		IRDA_WARNING("%s(), no room for parameter!\n", __FUNCTION__);
		spin_unlock_irqrestore(&self->spinlock, flags);
		return -1;
	}
	skb_put(skb, count);

	spin_unlock_irqrestore(&self->spinlock, flags);

	IRDA_DEBUG(2, "%s(), skb->len=%d\n", __FUNCTION__ , skb->len);

	if (flush) {
		/* ircomm_tty_do_softint will take care of the rest */
		schedule_work(&self->tqueue);
	}

	return count;
}

/*
 * Function ircomm_param_service_type (self, buf, len)
 *
 *    Handle service type, this function will both be called after the LM-IAS
 *    query and then the remote device sends its initial parameters
 *
 */
static int ircomm_param_service_type(void *instance, irda_param_t *param,
				     int get)
{
	struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
	__u8 service_type = (__u8) param->pv.i;

	IRDA_ASSERT(self != NULL, return -1;);
	IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);

	if (get) {
		param->pv.i = self->settings.service_type;
		return 0;
	}

	/* Find all common service types */
	service_type &= self->service_type;
	if (!service_type) {
		IRDA_DEBUG(2,
			   "%s(), No common service type to use!\n", __FUNCTION__ );
		return -1;
	}
	IRDA_DEBUG(0, "%s(), services in common=%02x\n", __FUNCTION__ ,
		   service_type);

	/*
	 * Now choose a preferred service type of those available
	 */
	if (service_type & IRCOMM_CENTRONICS)
		self->settings.service_type = IRCOMM_CENTRONICS;
	else if (service_type & IRCOMM_9_WIRE)
		self->settings.service_type = IRCOMM_9_WIRE;
	else if (service_type & IRCOMM_3_WIRE)
		self->settings.service_type = IRCOMM_3_WIRE;
	else if (service_type & IRCOMM_3_WIRE_RAW)
		self->settings.service_type = IRCOMM_3_WIRE_RAW;

	IRDA_DEBUG(0, "%s(), resulting service type=0x%02x\n", __FUNCTION__ ,
		   self->settings.service_type);

	/*
	 * Now the line is ready for some communication. Check if we are a
	 * server, and send over some initial parameters.
	 * Client do it in ircomm_tty_state_setup().
	 * Note : we may get called from ircomm_tty_getvalue_confirm(),
	 * therefore before we even have open any socket. And self->client
	 * is initialised to TRUE only later. So, we check if the link is
	 * really initialised. - Jean II
	 */
	if ((self->max_header_size != IRCOMM_TTY_HDR_UNINITIALISED) &&
	    (!self->client) &&
	    (self->settings.service_type != IRCOMM_3_WIRE_RAW))
	{
		/* Init connection */
		ircomm_tty_send_initial_parameters(self);
		ircomm_tty_link_established(self);
	}

	return 0;
}

/*
 * Function ircomm_param_port_type (self, param)
 *
 *    The port type parameter tells if the devices are serial or parallel.
 *    Since we only advertise serial service, this parameter should only
 *    be equal to IRCOMM_SERIAL.
 */
static int ircomm_param_port_type(void *instance, irda_param_t *param, int get)
{
	struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;

	IRDA_ASSERT(self != NULL, return -1;);
	IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);

	if (get)
		param->pv.i = IRCOMM_SERIAL;
	else {
		self->settings.port_type = (__u8) param->pv.i;

		IRDA_DEBUG(0, "%s(), port type=%d\n", __FUNCTION__ ,
			   self->settings.port_type);
	}
	return 0;
}

/*
 * Function ircomm_param_port_name (self, param)
 *
 *    Exchange port name
 *
 */
static int ircomm_param_port_name(void *instance, irda_param_t *param, int get)
{
	struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;

	IRDA_ASSERT(self != NULL, return -1;);
	IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);

	if (get) {
		IRDA_DEBUG(0, "%s(), not imp!\n", __FUNCTION__ );
	} else {
		IRDA_DEBUG(0, "%s(), port-name=%s\n", __FUNCTION__ , param->pv.c);
		strncpy(self->settings.port_name, param->pv.c, 32);
	}

	return 0;
}

/*
 * Function ircomm_param_data_rate (self, param)
 *
 *    Exchange data rate to be used in this settings
 *
 */
static int ircomm_param_data_rate(void *instance, irda_param_t *param, int get)
{
	struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;

	IRDA_ASSERT(self != NULL, return -1;);
	IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);

	if (get)
		param->pv.i = self->settings.data_rate;
	else
		self->settings.data_rate = param->pv.i;

	IRDA_DEBUG(2, "%s(), data rate = %d\n", __FUNCTION__ , param->pv.i);

	return 0;
}

/*
 * Function ircomm_param_data_format (self, param)
 *
 *    Exchange data format to be used in this settings
 *
 */
static int ircomm_param_data_format(void *instance, irda_param_t *param,
				    int get)
{
	struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;

	IRDA_ASSERT(self != NULL, return -1;);
	IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);

	if (get)
		param->pv.i = self->settings.data_format;
	else
		self->settings.data_format = (__u8) param->pv.i;

	return 0;
}

/*
 * Function ircomm_param_flow_control (self, param)
 *
 *    Exchange flow control settings to be used in this settings
 *
 */
static int ircomm_param_flow_control(void *instance, irda_param_t *param,
				     int get)
{
	struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;

	IRDA_ASSERT(self != NULL, return -1;);
	IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);

	if (get)
		param->pv.i = self->settings.flow_control;
	else
		self->settings.flow_control = (__u8) param->pv.i;

	IRDA_DEBUG(1, "%s(), flow control = 0x%02x\n", __FUNCTION__ , (__u8) param->pv.i);

	return 0;
}

/*
 * Function ircomm_param_xon_xoff (self, param)
 *
 *    Exchange XON/XOFF characters
 *
 */
static int ircomm_param_xon_xoff(void *instance, irda_param_t *param, int get)
{
	struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;

	IRDA_ASSERT(self != NULL, return -1;);
	IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);

	if (get) {
		param->pv.i = self->settings.xonxoff[0];
		param->pv.i |= self->settings.xonxoff[1] << 8;
	} else {
		self->settings.xonxoff[0] = (__u16) param->pv.i & 0xff;
		self->settings.xonxoff[1] = (__u16) param->pv.i >> 8;
	}

	IRDA_DEBUG(0, "%s(), XON/XOFF = 0x%02x,0x%02x\n", __FUNCTION__ ,
		   param->pv.i & 0xff, param->pv.i >> 8);

	return 0;
}

/*
 * Function ircomm_param_enq_ack (self, param)
 *
 *    Exchange ENQ/ACK characters
 *
 */
static int ircomm_param_enq_ack(void *instance, irda_param_t *param, int get)
{
	struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;

	IRDA_ASSERT(self != NULL, return -1;);
	IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);

	if (get) {
		param->pv.i = self->settings.enqack[0];
		param->pv.i |= self->settings.enqack[1] << 8;
	} else {
		self->settings.enqack[0] = (__u16) param->pv.i & 0xff;
		self->settings.enqack[1] = (__u16) param->pv.i >> 8;
	}

	IRDA_DEBUG(0, "%s(), ENQ/ACK = 0x%02x,0x%02x\n", __FUNCTION__ ,
		   param->pv.i & 0xff, param->pv.i >> 8);

	return 0;
}

/*
 * Function ircomm_param_line_status (self, param)
 *
 *
 *
 */
static int ircomm_param_line_status(void *instance, irda_param_t *param,
				    int get)
{
	IRDA_DEBUG(2, "%s(), not impl.\n", __FUNCTION__ );

	return 0;
}

/*
 * Function ircomm_param_dte (instance, param)
 *
 *    If we get here, there must be some sort of null-modem connection, and
 *    we are probably working in server mode as well.
 */
static int ircomm_param_dte(void *instance, irda_param_t *param, int get)
{
	struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
	__u8 dte;

	IRDA_ASSERT(self != NULL, return -1;);
	IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);

	if (get)
		param->pv.i = self->settings.dte;
	else {
		dte = (__u8) param->pv.i;

		self->settings.dce = 0;

		if (dte & IRCOMM_DELTA_DTR)
			self->settings.dce |= (IRCOMM_DELTA_DSR|
					      IRCOMM_DELTA_RI |
					      IRCOMM_DELTA_CD);
		if (dte & IRCOMM_DTR)
			self->settings.dce |= (IRCOMM_DSR|
					      IRCOMM_RI |
					      IRCOMM_CD);

		if (dte & IRCOMM_DELTA_RTS)
			self->settings.dce |= IRCOMM_DELTA_CTS;
		if (dte & IRCOMM_RTS)
			self->settings.dce |= IRCOMM_CTS;

		/* Take appropriate actions */
		ircomm_tty_check_modem_status(self);

		/* Null modem cable emulator */
		self->settings.null_modem = TRUE;
	}

	return 0;
}

/*
 * Function ircomm_param_dce (instance, param)
 *
 *
 *
 */
static int ircomm_param_dce(void *instance, irda_param_t *param, int get)
{
	struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
	__u8 dce;

	IRDA_DEBUG(1, "%s(), dce = 0x%02x\n", __FUNCTION__ , (__u8) param->pv.i);

	dce = (__u8) param->pv.i;

	IRDA_ASSERT(self != NULL, return -1;);
	IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);

	self->settings.dce = dce;

	/* Check if any of the settings have changed */
	if (dce & 0x0f) {
		if (dce & IRCOMM_DELTA_CTS) {
			IRDA_DEBUG(2, "%s(), CTS \n", __FUNCTION__ );
		}
	}

	ircomm_tty_check_modem_status(self);

	return 0;
}

/*
 * Function ircomm_param_poll (instance, param)
 *
 *    Called when the peer device is polling for the line settings
 *
 */
static int ircomm_param_poll(void *instance, irda_param_t *param, int get)
{
	struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;

	IRDA_ASSERT(self != NULL, return -1;);
	IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);

	/* Poll parameters are always of lenght 0 (just a signal) */
	if (!get) {
		/* Respond with DTE line settings */
		ircomm_param_request(self, IRCOMM_DTE, TRUE);
	}
	return 0;
}