Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) { |
Samuel Ortiz | 485fb2c | 2006-07-21 14:50:41 -0700 | [diff] [blame] | 124 | skb = alloc_skb(256, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |