1 /* 2 * Copyright (C) ST-Ericsson AB 2010 3 * Author: Sjur Brendeland/sjur.brandeland@stericsson.com 4 * License terms: GNU General Public License (GPL) version 2 5 */ 6 7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__ 8 9 #include <linux/stddef.h> 10 #include <linux/spinlock.h> 11 #include <linux/slab.h> 12 #include <net/caif/caif_layer.h> 13 #include <net/caif/cfpkt.h> 14 #include <net/caif/cfctrl.h> 15 16 #define container_obj(layr) container_of(layr, struct cfctrl, serv.layer) 17 #define UTILITY_NAME_LENGTH 16 18 #define CFPKT_CTRL_PKT_LEN 20 19 20 #ifdef CAIF_NO_LOOP 21 static int handle_loop(struct cfctrl *ctrl, 22 int cmd, struct cfpkt *pkt){ 23 return -1; 24 } 25 #else 26 static int handle_loop(struct cfctrl *ctrl, 27 int cmd, struct cfpkt *pkt); 28 #endif 29 static int cfctrl_recv(struct cflayer *layr, struct cfpkt *pkt); 30 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl, 31 int phyid); 32 33 34 struct cflayer *cfctrl_create(void) 35 { 36 struct dev_info dev_info; 37 struct cfctrl *this = 38 kmalloc(sizeof(struct cfctrl), GFP_ATOMIC); 39 if (!this) { 40 pr_warn("Out of memory\n"); 41 return NULL; 42 } 43 caif_assert(offsetof(struct cfctrl, serv.layer) == 0); 44 memset(&dev_info, 0, sizeof(dev_info)); 45 dev_info.id = 0xff; 46 memset(this, 0, sizeof(*this)); 47 cfsrvl_init(&this->serv, 0, &dev_info, false); 48 atomic_set(&this->req_seq_no, 1); 49 atomic_set(&this->rsp_seq_no, 1); 50 this->serv.layer.receive = cfctrl_recv; 51 sprintf(this->serv.layer.name, "ctrl"); 52 this->serv.layer.ctrlcmd = cfctrl_ctrlcmd; 53 #ifndef CAIF_NO_LOOP 54 spin_lock_init(&this->loop_linkid_lock); 55 this->loop_linkid = 1; 56 #endif 57 spin_lock_init(&this->info_list_lock); 58 INIT_LIST_HEAD(&this->list); 59 return &this->serv.layer; 60 } 61 62 void cfctrl_remove(struct cflayer *layer) 63 { 64 struct cfctrl_request_info *p, *tmp; 65 struct cfctrl *ctrl = container_obj(layer); 66 67 spin_lock_bh(&ctrl->info_list_lock); 68 list_for_each_entry_safe(p, tmp, &ctrl->list, list) { 69 list_del(&p->list); 70 kfree(p); 71 } 72 spin_unlock_bh(&ctrl->info_list_lock); 73 kfree(layer); 74 } 75 76 static bool param_eq(const struct cfctrl_link_param *p1, 77 const struct cfctrl_link_param *p2) 78 { 79 bool eq = 80 p1->linktype == p2->linktype && 81 p1->priority == p2->priority && 82 p1->phyid == p2->phyid && 83 p1->endpoint == p2->endpoint && p1->chtype == p2->chtype; 84 85 if (!eq) 86 return false; 87 88 switch (p1->linktype) { 89 case CFCTRL_SRV_VEI: 90 return true; 91 case CFCTRL_SRV_DATAGRAM: 92 return p1->u.datagram.connid == p2->u.datagram.connid; 93 case CFCTRL_SRV_RFM: 94 return 95 p1->u.rfm.connid == p2->u.rfm.connid && 96 strcmp(p1->u.rfm.volume, p2->u.rfm.volume) == 0; 97 case CFCTRL_SRV_UTIL: 98 return 99 p1->u.utility.fifosize_kb == p2->u.utility.fifosize_kb 100 && p1->u.utility.fifosize_bufs == 101 p2->u.utility.fifosize_bufs 102 && strcmp(p1->u.utility.name, p2->u.utility.name) == 0 103 && p1->u.utility.paramlen == p2->u.utility.paramlen 104 && memcmp(p1->u.utility.params, p2->u.utility.params, 105 p1->u.utility.paramlen) == 0; 106 107 case CFCTRL_SRV_VIDEO: 108 return p1->u.video.connid == p2->u.video.connid; 109 case CFCTRL_SRV_DBG: 110 return true; 111 case CFCTRL_SRV_DECM: 112 return false; 113 default: 114 return false; 115 } 116 return false; 117 } 118 119 static bool cfctrl_req_eq(const struct cfctrl_request_info *r1, 120 const struct cfctrl_request_info *r2) 121 { 122 if (r1->cmd != r2->cmd) 123 return false; 124 if (r1->cmd == CFCTRL_CMD_LINK_SETUP) 125 return param_eq(&r1->param, &r2->param); 126 else 127 return r1->channel_id == r2->channel_id; 128 } 129 130 /* Insert request at the end */ 131 static void cfctrl_insert_req(struct cfctrl *ctrl, 132 struct cfctrl_request_info *req) 133 { 134 spin_lock_bh(&ctrl->info_list_lock); 135 atomic_inc(&ctrl->req_seq_no); 136 req->sequence_no = atomic_read(&ctrl->req_seq_no); 137 list_add_tail(&req->list, &ctrl->list); 138 spin_unlock_bh(&ctrl->info_list_lock); 139 } 140 141 /* Compare and remove request */ 142 static struct cfctrl_request_info *cfctrl_remove_req(struct cfctrl *ctrl, 143 struct cfctrl_request_info *req) 144 { 145 struct cfctrl_request_info *p, *tmp, *first; 146 147 first = list_first_entry(&ctrl->list, struct cfctrl_request_info, list); 148 149 list_for_each_entry_safe(p, tmp, &ctrl->list, list) { 150 if (cfctrl_req_eq(req, p)) { 151 if (p != first) 152 pr_warn("Requests are not received in order\n"); 153 154 atomic_set(&ctrl->rsp_seq_no, 155 p->sequence_no); 156 list_del(&p->list); 157 goto out; 158 } 159 } 160 p = NULL; 161 out: 162 return p; 163 } 164 165 struct cfctrl_rsp *cfctrl_get_respfuncs(struct cflayer *layer) 166 { 167 struct cfctrl *this = container_obj(layer); 168 return &this->res; 169 } 170 171 static void init_info(struct caif_payload_info *info, struct cfctrl *cfctrl) 172 { 173 info->hdr_len = 0; 174 info->channel_id = cfctrl->serv.layer.id; 175 info->dev_info = &cfctrl->serv.dev_info; 176 } 177 178 void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid) 179 { 180 struct cfctrl *cfctrl = container_obj(layer); 181 int ret; 182 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN); 183 if (!pkt) { 184 pr_warn("Out of memory\n"); 185 return; 186 } 187 caif_assert(offsetof(struct cfctrl, serv.layer) == 0); 188 init_info(cfpkt_info(pkt), cfctrl); 189 cfpkt_info(pkt)->dev_info->id = physlinkid; 190 cfctrl->serv.dev_info.id = physlinkid; 191 cfpkt_addbdy(pkt, CFCTRL_CMD_ENUM); 192 cfpkt_addbdy(pkt, physlinkid); 193 ret = 194 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt); 195 } 196 197 int cfctrl_linkup_request(struct cflayer *layer, 198 struct cfctrl_link_param *param, 199 struct cflayer *user_layer) 200 { 201 struct cfctrl *cfctrl = container_obj(layer); 202 u32 tmp32; 203 u16 tmp16; 204 u8 tmp8; 205 struct cfctrl_request_info *req; 206 int ret; 207 char utility_name[16]; 208 struct cfpkt *pkt; 209 210 if (cfctrl_cancel_req(layer, user_layer) > 0) { 211 /* Slight Paranoia, check if already connecting */ 212 pr_err("Duplicate connect request for same client\n"); 213 WARN_ON(1); 214 return -EALREADY; 215 } 216 217 pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN); 218 if (!pkt) { 219 pr_warn("Out of memory\n"); 220 return -ENOMEM; 221 } 222 cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP); 223 cfpkt_addbdy(pkt, (param->chtype << 4) | param->linktype); 224 cfpkt_addbdy(pkt, (param->priority << 3) | param->phyid); 225 cfpkt_addbdy(pkt, param->endpoint & 0x03); 226 227 switch (param->linktype) { 228 case CFCTRL_SRV_VEI: 229 break; 230 case CFCTRL_SRV_VIDEO: 231 cfpkt_addbdy(pkt, (u8) param->u.video.connid); 232 break; 233 case CFCTRL_SRV_DBG: 234 break; 235 case CFCTRL_SRV_DATAGRAM: 236 tmp32 = cpu_to_le32(param->u.datagram.connid); 237 cfpkt_add_body(pkt, &tmp32, 4); 238 break; 239 case CFCTRL_SRV_RFM: 240 /* Construct a frame, convert DatagramConnectionID to network 241 * format long and copy it out... 242 */ 243 tmp32 = cpu_to_le32(param->u.rfm.connid); 244 cfpkt_add_body(pkt, &tmp32, 4); 245 /* Add volume name, including zero termination... */ 246 cfpkt_add_body(pkt, param->u.rfm.volume, 247 strlen(param->u.rfm.volume) + 1); 248 break; 249 case CFCTRL_SRV_UTIL: 250 tmp16 = cpu_to_le16(param->u.utility.fifosize_kb); 251 cfpkt_add_body(pkt, &tmp16, 2); 252 tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs); 253 cfpkt_add_body(pkt, &tmp16, 2); 254 memset(utility_name, 0, sizeof(utility_name)); 255 strncpy(utility_name, param->u.utility.name, 256 UTILITY_NAME_LENGTH - 1); 257 cfpkt_add_body(pkt, utility_name, UTILITY_NAME_LENGTH); 258 tmp8 = param->u.utility.paramlen; 259 cfpkt_add_body(pkt, &tmp8, 1); 260 cfpkt_add_body(pkt, param->u.utility.params, 261 param->u.utility.paramlen); 262 break; 263 default: 264 pr_warn("Request setup of bad link type = %d\n", 265 param->linktype); 266 return -EINVAL; 267 } 268 req = kzalloc(sizeof(*req), GFP_KERNEL); 269 if (!req) { 270 pr_warn("Out of memory\n"); 271 return -ENOMEM; 272 } 273 req->client_layer = user_layer; 274 req->cmd = CFCTRL_CMD_LINK_SETUP; 275 req->param = *param; 276 cfctrl_insert_req(cfctrl, req); 277 init_info(cfpkt_info(pkt), cfctrl); 278 /* 279 * NOTE:Always send linkup and linkdown request on the same 280 * device as the payload. Otherwise old queued up payload 281 * might arrive with the newly allocated channel ID. 282 */ 283 cfpkt_info(pkt)->dev_info->id = param->phyid; 284 ret = 285 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt); 286 if (ret < 0) { 287 int count; 288 289 count = cfctrl_cancel_req(&cfctrl->serv.layer, 290 user_layer); 291 if (count != 1) 292 pr_err("Could not remove request (%d)", count); 293 return -ENODEV; 294 } 295 return 0; 296 } 297 298 int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid, 299 struct cflayer *client) 300 { 301 int ret; 302 struct cfctrl *cfctrl = container_obj(layer); 303 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN); 304 if (!pkt) { 305 pr_warn("Out of memory\n"); 306 return -ENOMEM; 307 } 308 cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY); 309 cfpkt_addbdy(pkt, channelid); 310 init_info(cfpkt_info(pkt), cfctrl); 311 ret = 312 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt); 313 #ifndef CAIF_NO_LOOP 314 cfctrl->loop_linkused[channelid] = 0; 315 #endif 316 return ret; 317 } 318 319 int cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer) 320 { 321 struct cfctrl_request_info *p, *tmp; 322 struct cfctrl *ctrl = container_obj(layr); 323 int found = 0; 324 spin_lock_bh(&ctrl->info_list_lock); 325 326 list_for_each_entry_safe(p, tmp, &ctrl->list, list) { 327 if (p->client_layer == adap_layer) { 328 list_del(&p->list); 329 kfree(p); 330 found++; 331 } 332 } 333 334 spin_unlock_bh(&ctrl->info_list_lock); 335 return found; 336 } 337 338 static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt) 339 { 340 u8 cmdrsp; 341 u8 cmd; 342 int ret = -1; 343 u16 tmp16; 344 u8 len; 345 u8 param[255]; 346 u8 linkid; 347 struct cfctrl *cfctrl = container_obj(layer); 348 struct cfctrl_request_info rsp, *req; 349 350 351 cfpkt_extr_head(pkt, &cmdrsp, 1); 352 cmd = cmdrsp & CFCTRL_CMD_MASK; 353 if (cmd != CFCTRL_CMD_LINK_ERR 354 && CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)) { 355 if (handle_loop(cfctrl, cmd, pkt) != 0) 356 cmdrsp |= CFCTRL_ERR_BIT; 357 } 358 359 switch (cmd) { 360 case CFCTRL_CMD_LINK_SETUP: 361 { 362 enum cfctrl_srv serv; 363 enum cfctrl_srv servtype; 364 u8 endpoint; 365 u8 physlinkid; 366 u8 prio; 367 u8 tmp; 368 u32 tmp32; 369 u8 *cp; 370 int i; 371 struct cfctrl_link_param linkparam; 372 memset(&linkparam, 0, sizeof(linkparam)); 373 374 cfpkt_extr_head(pkt, &tmp, 1); 375 376 serv = tmp & CFCTRL_SRV_MASK; 377 linkparam.linktype = serv; 378 379 servtype = tmp >> 4; 380 linkparam.chtype = servtype; 381 382 cfpkt_extr_head(pkt, &tmp, 1); 383 physlinkid = tmp & 0x07; 384 prio = tmp >> 3; 385 386 linkparam.priority = prio; 387 linkparam.phyid = physlinkid; 388 cfpkt_extr_head(pkt, &endpoint, 1); 389 linkparam.endpoint = endpoint & 0x03; 390 391 switch (serv) { 392 case CFCTRL_SRV_VEI: 393 case CFCTRL_SRV_DBG: 394 if (CFCTRL_ERR_BIT & cmdrsp) 395 break; 396 /* Link ID */ 397 cfpkt_extr_head(pkt, &linkid, 1); 398 break; 399 case CFCTRL_SRV_VIDEO: 400 cfpkt_extr_head(pkt, &tmp, 1); 401 linkparam.u.video.connid = tmp; 402 if (CFCTRL_ERR_BIT & cmdrsp) 403 break; 404 /* Link ID */ 405 cfpkt_extr_head(pkt, &linkid, 1); 406 break; 407 408 case CFCTRL_SRV_DATAGRAM: 409 cfpkt_extr_head(pkt, &tmp32, 4); 410 linkparam.u.datagram.connid = 411 le32_to_cpu(tmp32); 412 if (CFCTRL_ERR_BIT & cmdrsp) 413 break; 414 /* Link ID */ 415 cfpkt_extr_head(pkt, &linkid, 1); 416 break; 417 case CFCTRL_SRV_RFM: 418 /* Construct a frame, convert 419 * DatagramConnectionID 420 * to network format long and copy it out... 421 */ 422 cfpkt_extr_head(pkt, &tmp32, 4); 423 linkparam.u.rfm.connid = 424 le32_to_cpu(tmp32); 425 cp = (u8 *) linkparam.u.rfm.volume; 426 for (cfpkt_extr_head(pkt, &tmp, 1); 427 cfpkt_more(pkt) && tmp != '\0'; 428 cfpkt_extr_head(pkt, &tmp, 1)) 429 *cp++ = tmp; 430 *cp = '\0'; 431 432 if (CFCTRL_ERR_BIT & cmdrsp) 433 break; 434 /* Link ID */ 435 cfpkt_extr_head(pkt, &linkid, 1); 436 437 break; 438 case CFCTRL_SRV_UTIL: 439 /* Construct a frame, convert 440 * DatagramConnectionID 441 * to network format long and copy it out... 442 */ 443 /* Fifosize KB */ 444 cfpkt_extr_head(pkt, &tmp16, 2); 445 linkparam.u.utility.fifosize_kb = 446 le16_to_cpu(tmp16); 447 /* Fifosize bufs */ 448 cfpkt_extr_head(pkt, &tmp16, 2); 449 linkparam.u.utility.fifosize_bufs = 450 le16_to_cpu(tmp16); 451 /* name */ 452 cp = (u8 *) linkparam.u.utility.name; 453 caif_assert(sizeof(linkparam.u.utility.name) 454 >= UTILITY_NAME_LENGTH); 455 for (i = 0; 456 i < UTILITY_NAME_LENGTH 457 && cfpkt_more(pkt); i++) { 458 cfpkt_extr_head(pkt, &tmp, 1); 459 *cp++ = tmp; 460 } 461 /* Length */ 462 cfpkt_extr_head(pkt, &len, 1); 463 linkparam.u.utility.paramlen = len; 464 /* Param Data */ 465 cp = linkparam.u.utility.params; 466 while (cfpkt_more(pkt) && len--) { 467 cfpkt_extr_head(pkt, &tmp, 1); 468 *cp++ = tmp; 469 } 470 if (CFCTRL_ERR_BIT & cmdrsp) 471 break; 472 /* Link ID */ 473 cfpkt_extr_head(pkt, &linkid, 1); 474 /* Length */ 475 cfpkt_extr_head(pkt, &len, 1); 476 /* Param Data */ 477 cfpkt_extr_head(pkt, ¶m, len); 478 break; 479 default: 480 pr_warn("Request setup - invalid link type (%d)\n", 481 serv); 482 goto error; 483 } 484 485 rsp.cmd = cmd; 486 rsp.param = linkparam; 487 spin_lock_bh(&cfctrl->info_list_lock); 488 req = cfctrl_remove_req(cfctrl, &rsp); 489 490 if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) || 491 cfpkt_erroneous(pkt)) { 492 pr_err("Invalid O/E bit or parse error on CAIF control channel\n"); 493 cfctrl->res.reject_rsp(cfctrl->serv.layer.up, 494 0, 495 req ? req->client_layer 496 : NULL); 497 } else { 498 cfctrl->res.linksetup_rsp(cfctrl->serv. 499 layer.up, linkid, 500 serv, physlinkid, 501 req ? req-> 502 client_layer : NULL); 503 } 504 505 if (req != NULL) 506 kfree(req); 507 508 spin_unlock_bh(&cfctrl->info_list_lock); 509 } 510 break; 511 case CFCTRL_CMD_LINK_DESTROY: 512 cfpkt_extr_head(pkt, &linkid, 1); 513 cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid); 514 break; 515 case CFCTRL_CMD_LINK_ERR: 516 pr_err("Frame Error Indication received\n"); 517 cfctrl->res.linkerror_ind(); 518 break; 519 case CFCTRL_CMD_ENUM: 520 cfctrl->res.enum_rsp(); 521 break; 522 case CFCTRL_CMD_SLEEP: 523 cfctrl->res.sleep_rsp(); 524 break; 525 case CFCTRL_CMD_WAKE: 526 cfctrl->res.wake_rsp(); 527 break; 528 case CFCTRL_CMD_LINK_RECONF: 529 cfctrl->res.restart_rsp(); 530 break; 531 case CFCTRL_CMD_RADIO_SET: 532 cfctrl->res.radioset_rsp(); 533 break; 534 default: 535 pr_err("Unrecognized Control Frame\n"); 536 goto error; 537 break; 538 } 539 ret = 0; 540 error: 541 cfpkt_destroy(pkt); 542 return ret; 543 } 544 545 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl, 546 int phyid) 547 { 548 struct cfctrl *this = container_obj(layr); 549 switch (ctrl) { 550 case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND: 551 case CAIF_CTRLCMD_FLOW_OFF_IND: 552 spin_lock_bh(&this->info_list_lock); 553 if (!list_empty(&this->list)) { 554 pr_debug("Received flow off in control layer\n"); 555 } 556 spin_unlock_bh(&this->info_list_lock); 557 break; 558 case _CAIF_CTRLCMD_PHYIF_DOWN_IND: { 559 struct cfctrl_request_info *p, *tmp; 560 561 /* Find all connect request and report failure */ 562 spin_lock_bh(&this->info_list_lock); 563 list_for_each_entry_safe(p, tmp, &this->list, list) { 564 if (p->param.phyid == phyid) { 565 list_del(&p->list); 566 p->client_layer->ctrlcmd(p->client_layer, 567 CAIF_CTRLCMD_INIT_FAIL_RSP, 568 phyid); 569 kfree(p); 570 } 571 } 572 spin_unlock_bh(&this->info_list_lock); 573 break; 574 } 575 default: 576 break; 577 } 578 } 579 580 #ifndef CAIF_NO_LOOP 581 static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt) 582 { 583 static int last_linkid; 584 static int dec; 585 u8 linkid, linktype, tmp; 586 switch (cmd) { 587 case CFCTRL_CMD_LINK_SETUP: 588 spin_lock_bh(&ctrl->loop_linkid_lock); 589 if (!dec) { 590 for (linkid = last_linkid + 1; linkid < 255; linkid++) 591 if (!ctrl->loop_linkused[linkid]) 592 goto found; 593 } 594 dec = 1; 595 for (linkid = last_linkid - 1; linkid > 0; linkid--) 596 if (!ctrl->loop_linkused[linkid]) 597 goto found; 598 spin_unlock_bh(&ctrl->loop_linkid_lock); 599 600 found: 601 if (linkid < 10) 602 dec = 0; 603 604 if (!ctrl->loop_linkused[linkid]) 605 ctrl->loop_linkused[linkid] = 1; 606 607 last_linkid = linkid; 608 609 cfpkt_add_trail(pkt, &linkid, 1); 610 spin_unlock_bh(&ctrl->loop_linkid_lock); 611 cfpkt_peek_head(pkt, &linktype, 1); 612 if (linktype == CFCTRL_SRV_UTIL) { 613 tmp = 0x01; 614 cfpkt_add_trail(pkt, &tmp, 1); 615 cfpkt_add_trail(pkt, &tmp, 1); 616 } 617 break; 618 619 case CFCTRL_CMD_LINK_DESTROY: 620 spin_lock_bh(&ctrl->loop_linkid_lock); 621 cfpkt_peek_head(pkt, &linkid, 1); 622 ctrl->loop_linkused[linkid] = 0; 623 spin_unlock_bh(&ctrl->loop_linkid_lock); 624 break; 625 default: 626 break; 627 } 628 return 0; 629 } 630 #endif 631