net/irda/ircomm/ircomm_param.c

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