1 /*********************************************************************
3 * Filename: ircomm_param.c
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>
12 * Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
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.
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.
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,
29 ********************************************************************/
31 #include <linux/sched.h>
32 #include <linux/workqueue.h>
33 #include <linux/interrupt.h>
35 #include <net/irda/irda.h>
36 #include <net/irda/parameters.h>
38 #include <net/irda/ircomm_core.h>
39 #include <net/irda/ircomm_tty_attach.h>
40 #include <net/irda/ircomm_tty.h>
42 #include <net/irda/ircomm_param.h>
44 static int ircomm_param_service_type(void *instance, irda_param_t *param,
46 static int ircomm_param_port_type(void *instance, irda_param_t *param,
48 static int ircomm_param_port_name(void *instance, irda_param_t *param,
50 static int ircomm_param_service_type(void *instance, irda_param_t *param,
52 static int ircomm_param_data_rate(void *instance, irda_param_t *param,
54 static int ircomm_param_data_format(void *instance, irda_param_t *param,
56 static int ircomm_param_flow_control(void *instance, irda_param_t *param,
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,
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);
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 }
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 }
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 },
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 } */
92 pi_param_info_t ircomm_param_info = { pi_major_call_table, 3, 0x0f, 4 };
95 * Function ircomm_param_flush (self)
97 * Flush (send) out all queued parameters
100 int ircomm_param_flush(struct ircomm_tty_cb *self)
102 /* we should lock here, but I guess this function is unused...
104 if (self->ctrl_skb) {
105 ircomm_control_request(self->ircomm, self->ctrl_skb);
106 self->ctrl_skb = NULL;
112 * Function ircomm_param_request (self, pi, flush)
114 * Queue a parameter for the control channel
117 int ircomm_param_request(struct ircomm_tty_cb *self, __u8 pi, int flush)
119 struct tty_struct *tty;
124 IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
126 ASSERT(self != NULL, return -1;);
127 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
133 /* Make sure we don't send parameters for raw mode */
134 if (self->service_type == IRCOMM_3_WIRE_RAW)
137 spin_lock_irqsave(&self->spinlock, flags);
139 skb = self->ctrl_skb;
141 skb = dev_alloc_skb(256);
143 spin_unlock_irqrestore(&self->spinlock, flags);
147 skb_reserve(skb, self->max_header_size);
148 self->ctrl_skb = skb;
151 * Inserting is a little bit tricky since we don't know how much
152 * room we will need. But this should hopefully work OK
154 count = irda_param_insert(self, pi, skb->tail, skb_tailroom(skb),
157 WARNING("%s(), no room for parameter!\n", __FUNCTION__);
158 spin_unlock_irqrestore(&self->spinlock, flags);
163 spin_unlock_irqrestore(&self->spinlock, flags);
165 IRDA_DEBUG(2, "%s(), skb->len=%d\n", __FUNCTION__ , skb->len);
168 /* ircomm_tty_do_softint will take care of the rest */
169 schedule_work(&self->tqueue);
176 * Function ircomm_param_service_type (self, buf, len)
178 * Handle service type, this function will both be called after the LM-IAS
179 * query and then the remote device sends its initial parameters
182 static int ircomm_param_service_type(void *instance, irda_param_t *param,
185 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
186 __u8 service_type = (__u8) param->pv.i;
188 ASSERT(self != NULL, return -1;);
189 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
192 param->pv.i = self->settings.service_type;
196 /* Find all common service types */
197 service_type &= self->service_type;
200 "%s(), No common service type to use!\n", __FUNCTION__ );
203 IRDA_DEBUG(0, "%s(), services in common=%02x\n", __FUNCTION__ ,
207 * Now choose a preferred service type of those available
209 if (service_type & IRCOMM_CENTRONICS)
210 self->settings.service_type = IRCOMM_CENTRONICS;
211 else if (service_type & IRCOMM_9_WIRE)
212 self->settings.service_type = IRCOMM_9_WIRE;
213 else if (service_type & IRCOMM_3_WIRE)
214 self->settings.service_type = IRCOMM_3_WIRE;
215 else if (service_type & IRCOMM_3_WIRE_RAW)
216 self->settings.service_type = IRCOMM_3_WIRE_RAW;
218 IRDA_DEBUG(0, "%s(), resulting service type=0x%02x\n", __FUNCTION__ ,
219 self->settings.service_type);
222 * Now the line is ready for some communication. Check if we are a
223 * server, and send over some initial parameters.
224 * Client do it in ircomm_tty_state_setup().
225 * Note : we may get called from ircomm_tty_getvalue_confirm(),
226 * therefore before we even have open any socket. And self->client
227 * is initialised to TRUE only later. So, we check if the link is
228 * really initialised. - Jean II
230 if ((self->max_header_size != IRCOMM_TTY_HDR_UNINITIALISED) &&
232 (self->settings.service_type != IRCOMM_3_WIRE_RAW))
234 /* Init connection */
235 ircomm_tty_send_initial_parameters(self);
236 ircomm_tty_link_established(self);
243 * Function ircomm_param_port_type (self, param)
245 * The port type parameter tells if the devices are serial or parallel.
246 * Since we only advertise serial service, this parameter should only
247 * be equal to IRCOMM_SERIAL.
249 static int ircomm_param_port_type(void *instance, irda_param_t *param, int get)
251 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
253 ASSERT(self != NULL, return -1;);
254 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
257 param->pv.i = IRCOMM_SERIAL;
259 self->settings.port_type = (__u8) param->pv.i;
261 IRDA_DEBUG(0, "%s(), port type=%d\n", __FUNCTION__ ,
262 self->settings.port_type);
268 * Function ircomm_param_port_name (self, param)
273 static int ircomm_param_port_name(void *instance, irda_param_t *param, int get)
275 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
277 ASSERT(self != NULL, return -1;);
278 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
281 IRDA_DEBUG(0, "%s(), not imp!\n", __FUNCTION__ );
283 IRDA_DEBUG(0, "%s(), port-name=%s\n", __FUNCTION__ , param->pv.c);
284 strncpy(self->settings.port_name, param->pv.c, 32);
291 * Function ircomm_param_data_rate (self, param)
293 * Exchange data rate to be used in this settings
296 static int ircomm_param_data_rate(void *instance, irda_param_t *param, int get)
298 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
300 ASSERT(self != NULL, return -1;);
301 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
304 param->pv.i = self->settings.data_rate;
306 self->settings.data_rate = param->pv.i;
308 IRDA_DEBUG(2, "%s(), data rate = %d\n", __FUNCTION__ , param->pv.i);
314 * Function ircomm_param_data_format (self, param)
316 * Exchange data format to be used in this settings
319 static int ircomm_param_data_format(void *instance, irda_param_t *param,
322 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
324 ASSERT(self != NULL, return -1;);
325 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
328 param->pv.i = self->settings.data_format;
330 self->settings.data_format = (__u8) param->pv.i;
336 * Function ircomm_param_flow_control (self, param)
338 * Exchange flow control settings to be used in this settings
341 static int ircomm_param_flow_control(void *instance, irda_param_t *param,
344 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
346 ASSERT(self != NULL, return -1;);
347 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
350 param->pv.i = self->settings.flow_control;
352 self->settings.flow_control = (__u8) param->pv.i;
354 IRDA_DEBUG(1, "%s(), flow control = 0x%02x\n", __FUNCTION__ , (__u8) param->pv.i);
360 * Function ircomm_param_xon_xoff (self, param)
362 * Exchange XON/XOFF characters
365 static int ircomm_param_xon_xoff(void *instance, irda_param_t *param, int get)
367 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
369 ASSERT(self != NULL, return -1;);
370 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
373 param->pv.i = self->settings.xonxoff[0];
374 param->pv.i |= self->settings.xonxoff[1] << 8;
376 self->settings.xonxoff[0] = (__u16) param->pv.i & 0xff;
377 self->settings.xonxoff[1] = (__u16) param->pv.i >> 8;
380 IRDA_DEBUG(0, "%s(), XON/XOFF = 0x%02x,0x%02x\n", __FUNCTION__ ,
381 param->pv.i & 0xff, param->pv.i >> 8);
387 * Function ircomm_param_enq_ack (self, param)
389 * Exchange ENQ/ACK characters
392 static int ircomm_param_enq_ack(void *instance, irda_param_t *param, int get)
394 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
396 ASSERT(self != NULL, return -1;);
397 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
400 param->pv.i = self->settings.enqack[0];
401 param->pv.i |= self->settings.enqack[1] << 8;
403 self->settings.enqack[0] = (__u16) param->pv.i & 0xff;
404 self->settings.enqack[1] = (__u16) param->pv.i >> 8;
407 IRDA_DEBUG(0, "%s(), ENQ/ACK = 0x%02x,0x%02x\n", __FUNCTION__ ,
408 param->pv.i & 0xff, param->pv.i >> 8);
414 * Function ircomm_param_line_status (self, param)
419 static int ircomm_param_line_status(void *instance, irda_param_t *param,
422 IRDA_DEBUG(2, "%s(), not impl.\n", __FUNCTION__ );
428 * Function ircomm_param_dte (instance, param)
430 * If we get here, there must be some sort of null-modem connection, and
431 * we are probably working in server mode as well.
433 static int ircomm_param_dte(void *instance, irda_param_t *param, int get)
435 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
438 ASSERT(self != NULL, return -1;);
439 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
442 param->pv.i = self->settings.dte;
444 dte = (__u8) param->pv.i;
446 self->settings.dce = 0;
448 if (dte & IRCOMM_DELTA_DTR)
449 self->settings.dce |= (IRCOMM_DELTA_DSR|
452 if (dte & IRCOMM_DTR)
453 self->settings.dce |= (IRCOMM_DSR|
457 if (dte & IRCOMM_DELTA_RTS)
458 self->settings.dce |= IRCOMM_DELTA_CTS;
459 if (dte & IRCOMM_RTS)
460 self->settings.dce |= IRCOMM_CTS;
462 /* Take appropriate actions */
463 ircomm_tty_check_modem_status(self);
465 /* Null modem cable emulator */
466 self->settings.null_modem = TRUE;
473 * Function ircomm_param_dce (instance, param)
478 static int ircomm_param_dce(void *instance, irda_param_t *param, int get)
480 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
483 IRDA_DEBUG(1, "%s(), dce = 0x%02x\n", __FUNCTION__ , (__u8) param->pv.i);
485 dce = (__u8) param->pv.i;
487 ASSERT(self != NULL, return -1;);
488 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
490 self->settings.dce = dce;
492 /* Check if any of the settings have changed */
494 if (dce & IRCOMM_DELTA_CTS) {
495 IRDA_DEBUG(2, "%s(), CTS \n", __FUNCTION__ );
499 ircomm_tty_check_modem_status(self);
505 * Function ircomm_param_poll (instance, param)
507 * Called when the peer device is polling for the line settings
510 static int ircomm_param_poll(void *instance, irda_param_t *param, int get)
512 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
514 ASSERT(self != NULL, return -1;);
515 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
517 /* Poll parameters are always of lenght 0 (just a signal) */
519 /* Respond with DTE line settings */
520 ircomm_param_request(self, IRCOMM_DTE, TRUE);