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