linux/net/caif/cfctrl.c
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   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#include <linux/stddef.h>
   8#include <linux/spinlock.h>
   9#include <linux/slab.h>
  10#include <net/caif/caif_layer.h>
  11#include <net/caif/cfpkt.h>
  12#include <net/caif/cfctrl.h>
  13
  14#define container_obj(layr) container_of(layr, struct cfctrl, serv.layer)
  15#define UTILITY_NAME_LENGTH 16
  16#define CFPKT_CTRL_PKT_LEN 20
  17
  18
  19#ifdef CAIF_NO_LOOP
  20static int handle_loop(struct cfctrl *ctrl,
  21                              int cmd, struct cfpkt *pkt){
  22        return CAIF_FAILURE;
  23}
  24#else
  25static int handle_loop(struct cfctrl *ctrl,
  26                int cmd, struct cfpkt *pkt);
  27#endif
  28static int cfctrl_recv(struct cflayer *layr, struct cfpkt *pkt);
  29static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
  30                           int phyid);
  31
  32
  33struct cflayer *cfctrl_create(void)
  34{
  35        struct dev_info dev_info;
  36        struct cfctrl *this =
  37                kmalloc(sizeof(struct cfctrl), GFP_ATOMIC);
  38        if (!this) {
  39                pr_warning("CAIF: %s(): Out of memory\n", __func__);
  40                return NULL;
  41        }
  42        caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
  43        memset(&dev_info, 0, sizeof(dev_info));
  44        dev_info.id = 0xff;
  45        memset(this, 0, sizeof(*this));
  46        cfsrvl_init(&this->serv, 0, &dev_info);
  47        atomic_set(&this->req_seq_no, 1);
  48        atomic_set(&this->rsp_seq_no, 1);
  49        this->serv.layer.receive = cfctrl_recv;
  50        sprintf(this->serv.layer.name, "ctrl");
  51        this->serv.layer.ctrlcmd = cfctrl_ctrlcmd;
  52        spin_lock_init(&this->loop_linkid_lock);
  53        spin_lock_init(&this->info_list_lock);
  54        INIT_LIST_HEAD(&this->list);
  55        this->loop_linkid = 1;
  56        return &this->serv.layer;
  57}
  58
  59static bool param_eq(struct cfctrl_link_param *p1, struct cfctrl_link_param *p2)
  60{
  61        bool eq =
  62            p1->linktype == p2->linktype &&
  63            p1->priority == p2->priority &&
  64            p1->phyid == p2->phyid &&
  65            p1->endpoint == p2->endpoint && p1->chtype == p2->chtype;
  66
  67        if (!eq)
  68                return false;
  69
  70        switch (p1->linktype) {
  71        case CFCTRL_SRV_VEI:
  72                return true;
  73        case CFCTRL_SRV_DATAGRAM:
  74                return p1->u.datagram.connid == p2->u.datagram.connid;
  75        case CFCTRL_SRV_RFM:
  76                return
  77                    p1->u.rfm.connid == p2->u.rfm.connid &&
  78                    strcmp(p1->u.rfm.volume, p2->u.rfm.volume) == 0;
  79        case CFCTRL_SRV_UTIL:
  80                return
  81                    p1->u.utility.fifosize_kb == p2->u.utility.fifosize_kb
  82                    && p1->u.utility.fifosize_bufs ==
  83                    p2->u.utility.fifosize_bufs
  84                    && strcmp(p1->u.utility.name, p2->u.utility.name) == 0
  85                    && p1->u.utility.paramlen == p2->u.utility.paramlen
  86                    && memcmp(p1->u.utility.params, p2->u.utility.params,
  87                              p1->u.utility.paramlen) == 0;
  88
  89        case CFCTRL_SRV_VIDEO:
  90                return p1->u.video.connid == p2->u.video.connid;
  91        case CFCTRL_SRV_DBG:
  92                return true;
  93        case CFCTRL_SRV_DECM:
  94                return false;
  95        default:
  96                return false;
  97        }
  98        return false;
  99}
 100
 101bool cfctrl_req_eq(struct cfctrl_request_info *r1,
 102                   struct cfctrl_request_info *r2)
 103{
 104        if (r1->cmd != r2->cmd)
 105                return false;
 106        if (r1->cmd == CFCTRL_CMD_LINK_SETUP)
 107                return param_eq(&r1->param, &r2->param);
 108        else
 109                return r1->channel_id == r2->channel_id;
 110}
 111
 112/* Insert request at the end */
 113void cfctrl_insert_req(struct cfctrl *ctrl,
 114                              struct cfctrl_request_info *req)
 115{
 116        spin_lock(&ctrl->info_list_lock);
 117        atomic_inc(&ctrl->req_seq_no);
 118        req->sequence_no = atomic_read(&ctrl->req_seq_no);
 119        list_add_tail(&req->list, &ctrl->list);
 120        spin_unlock(&ctrl->info_list_lock);
 121}
 122
 123/* Compare and remove request */
 124struct cfctrl_request_info *cfctrl_remove_req(struct cfctrl *ctrl,
 125                                              struct cfctrl_request_info *req)
 126{
 127        struct cfctrl_request_info *p, *tmp, *first;
 128
 129        spin_lock(&ctrl->info_list_lock);
 130        first = list_first_entry(&ctrl->list, struct cfctrl_request_info, list);
 131
 132        list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
 133                if (cfctrl_req_eq(req, p)) {
 134                        if (p != first)
 135                                pr_warning("CAIF: %s(): Requests are not "
 136                                        "received in order\n",
 137                                        __func__);
 138
 139                        atomic_set(&ctrl->rsp_seq_no,
 140                                         p->sequence_no);
 141                        list_del(&p->list);
 142                        goto out;
 143                }
 144        }
 145        p = NULL;
 146out:
 147        spin_unlock(&ctrl->info_list_lock);
 148        return p;
 149}
 150
 151struct cfctrl_rsp *cfctrl_get_respfuncs(struct cflayer *layer)
 152{
 153        struct cfctrl *this = container_obj(layer);
 154        return &this->res;
 155}
 156
 157void cfctrl_set_dnlayer(struct cflayer *this, struct cflayer *dn)
 158{
 159        this->dn = dn;
 160}
 161
 162void cfctrl_set_uplayer(struct cflayer *this, struct cflayer *up)
 163{
 164        this->up = up;
 165}
 166
 167static void init_info(struct caif_payload_info *info, struct cfctrl *cfctrl)
 168{
 169        info->hdr_len = 0;
 170        info->channel_id = cfctrl->serv.layer.id;
 171        info->dev_info = &cfctrl->serv.dev_info;
 172}
 173
 174void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid)
 175{
 176        struct cfctrl *cfctrl = container_obj(layer);
 177        int ret;
 178        struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
 179        if (!pkt) {
 180                pr_warning("CAIF: %s(): Out of memory\n", __func__);
 181                return;
 182        }
 183        caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
 184        init_info(cfpkt_info(pkt), cfctrl);
 185        cfpkt_info(pkt)->dev_info->id = physlinkid;
 186        cfctrl->serv.dev_info.id = physlinkid;
 187        cfpkt_addbdy(pkt, CFCTRL_CMD_ENUM);
 188        cfpkt_addbdy(pkt, physlinkid);
 189        ret =
 190            cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
 191        if (ret < 0) {
 192                pr_err("CAIF: %s(): Could not transmit enum message\n",
 193                        __func__);
 194                cfpkt_destroy(pkt);
 195        }
 196}
 197
 198int cfctrl_linkup_request(struct cflayer *layer,
 199                           struct cfctrl_link_param *param,
 200                           struct cflayer *user_layer)
 201{
 202        struct cfctrl *cfctrl = container_obj(layer);
 203        u32 tmp32;
 204        u16 tmp16;
 205        u8 tmp8;
 206        struct cfctrl_request_info *req;
 207        int ret;
 208        char utility_name[16];
 209        struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
 210        if (!pkt) {
 211                pr_warning("CAIF: %s(): Out of memory\n", __func__);
 212                return -ENOMEM;
 213        }
 214        cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP);
 215        cfpkt_addbdy(pkt, (param->chtype << 4) + param->linktype);
 216        cfpkt_addbdy(pkt, (param->priority << 3) + param->phyid);
 217        cfpkt_addbdy(pkt, param->endpoint & 0x03);
 218
 219        switch (param->linktype) {
 220        case CFCTRL_SRV_VEI:
 221                break;
 222        case CFCTRL_SRV_VIDEO:
 223                cfpkt_addbdy(pkt, (u8) param->u.video.connid);
 224                break;
 225        case CFCTRL_SRV_DBG:
 226                break;
 227        case CFCTRL_SRV_DATAGRAM:
 228                tmp32 = cpu_to_le32(param->u.datagram.connid);
 229                cfpkt_add_body(pkt, &tmp32, 4);
 230                break;
 231        case CFCTRL_SRV_RFM:
 232                /* Construct a frame, convert DatagramConnectionID to network
 233                 * format long and copy it out...
 234                 */
 235                tmp32 = cpu_to_le32(param->u.rfm.connid);
 236                cfpkt_add_body(pkt, &tmp32, 4);
 237                /* Add volume name, including zero termination... */
 238                cfpkt_add_body(pkt, param->u.rfm.volume,
 239                               strlen(param->u.rfm.volume) + 1);
 240                break;
 241        case CFCTRL_SRV_UTIL:
 242                tmp16 = cpu_to_le16(param->u.utility.fifosize_kb);
 243                cfpkt_add_body(pkt, &tmp16, 2);
 244                tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs);
 245                cfpkt_add_body(pkt, &tmp16, 2);
 246                memset(utility_name, 0, sizeof(utility_name));
 247                strncpy(utility_name, param->u.utility.name,
 248                        UTILITY_NAME_LENGTH - 1);
 249                cfpkt_add_body(pkt, utility_name, UTILITY_NAME_LENGTH);
 250                tmp8 = param->u.utility.paramlen;
 251                cfpkt_add_body(pkt, &tmp8, 1);
 252                cfpkt_add_body(pkt, param->u.utility.params,
 253                               param->u.utility.paramlen);
 254                break;
 255        default:
 256                pr_warning("CAIF: %s():Request setup of bad link type = %d\n",
 257                           __func__, param->linktype);
 258                return -EINVAL;
 259        }
 260        req = kzalloc(sizeof(*req), GFP_KERNEL);
 261        if (!req) {
 262                pr_warning("CAIF: %s(): Out of memory\n", __func__);
 263                return -ENOMEM;
 264        }
 265        req->client_layer = user_layer;
 266        req->cmd = CFCTRL_CMD_LINK_SETUP;
 267        req->param = *param;
 268        cfctrl_insert_req(cfctrl, req);
 269        init_info(cfpkt_info(pkt), cfctrl);
 270        /*
 271         * NOTE:Always send linkup and linkdown request on the same
 272         *      device as the payload. Otherwise old queued up payload
 273         *      might arrive with the newly allocated channel ID.
 274         */
 275        cfpkt_info(pkt)->dev_info->id = param->phyid;
 276        ret =
 277            cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
 278        if (ret < 0) {
 279                pr_err("CAIF: %s(): Could not transmit linksetup request\n",
 280                        __func__);
 281                cfpkt_destroy(pkt);
 282                return -ENODEV;
 283        }
 284        return 0;
 285}
 286
 287int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
 288                                struct cflayer *client)
 289{
 290        int ret;
 291        struct cfctrl *cfctrl = container_obj(layer);
 292        struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
 293        if (!pkt) {
 294                pr_warning("CAIF: %s(): Out of memory\n", __func__);
 295                return -ENOMEM;
 296        }
 297        cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
 298        cfpkt_addbdy(pkt, channelid);
 299        init_info(cfpkt_info(pkt), cfctrl);
 300        ret =
 301            cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
 302        if (ret < 0) {
 303                pr_err("CAIF: %s(): Could not transmit link-down request\n",
 304                        __func__);
 305                cfpkt_destroy(pkt);
 306        }
 307        return ret;
 308}
 309
 310void cfctrl_sleep_req(struct cflayer *layer)
 311{
 312        int ret;
 313        struct cfctrl *cfctrl = container_obj(layer);
 314        struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
 315        if (!pkt) {
 316                pr_warning("CAIF: %s(): Out of memory\n", __func__);
 317                return;
 318        }
 319        cfpkt_addbdy(pkt, CFCTRL_CMD_SLEEP);
 320        init_info(cfpkt_info(pkt), cfctrl);
 321        ret =
 322            cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
 323        if (ret < 0)
 324                cfpkt_destroy(pkt);
 325}
 326
 327void cfctrl_wake_req(struct cflayer *layer)
 328{
 329        int ret;
 330        struct cfctrl *cfctrl = container_obj(layer);
 331        struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
 332        if (!pkt) {
 333                pr_warning("CAIF: %s(): Out of memory\n", __func__);
 334                return;
 335        }
 336        cfpkt_addbdy(pkt, CFCTRL_CMD_WAKE);
 337        init_info(cfpkt_info(pkt), cfctrl);
 338        ret =
 339            cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
 340        if (ret < 0)
 341                cfpkt_destroy(pkt);
 342}
 343
 344void cfctrl_getstartreason_req(struct cflayer *layer)
 345{
 346        int ret;
 347        struct cfctrl *cfctrl = container_obj(layer);
 348        struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
 349        if (!pkt) {
 350                pr_warning("CAIF: %s(): Out of memory\n", __func__);
 351                return;
 352        }
 353        cfpkt_addbdy(pkt, CFCTRL_CMD_START_REASON);
 354        init_info(cfpkt_info(pkt), cfctrl);
 355        ret =
 356            cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
 357        if (ret < 0)
 358                cfpkt_destroy(pkt);
 359}
 360
 361
 362void cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer)
 363{
 364        struct cfctrl_request_info *p, *tmp;
 365        struct cfctrl *ctrl = container_obj(layr);
 366        spin_lock(&ctrl->info_list_lock);
 367        pr_warning("CAIF: %s(): enter\n", __func__);
 368
 369        list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
 370                if (p->client_layer == adap_layer) {
 371                        pr_warning("CAIF: %s(): cancel req :%d\n", __func__,
 372                                        p->sequence_no);
 373                        list_del(&p->list);
 374                        kfree(p);
 375                }
 376        }
 377
 378        spin_unlock(&ctrl->info_list_lock);
 379}
 380
 381static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
 382{
 383        u8 cmdrsp;
 384        u8 cmd;
 385        int ret = -1;
 386        u16 tmp16;
 387        u8 len;
 388        u8 param[255];
 389        u8 linkid;
 390        struct cfctrl *cfctrl = container_obj(layer);
 391        struct cfctrl_request_info rsp, *req;
 392
 393
 394        cfpkt_extr_head(pkt, &cmdrsp, 1);
 395        cmd = cmdrsp & CFCTRL_CMD_MASK;
 396        if (cmd != CFCTRL_CMD_LINK_ERR
 397            && CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)) {
 398                if (handle_loop(cfctrl, cmd, pkt) == CAIF_FAILURE)
 399                        cmdrsp |= CFCTRL_ERR_BIT;
 400        }
 401
 402        switch (cmd) {
 403        case CFCTRL_CMD_LINK_SETUP:
 404                {
 405                        enum cfctrl_srv serv;
 406                        enum cfctrl_srv servtype;
 407                        u8 endpoint;
 408                        u8 physlinkid;
 409                        u8 prio;
 410                        u8 tmp;
 411                        u32 tmp32;
 412                        u8 *cp;
 413                        int i;
 414                        struct cfctrl_link_param linkparam;
 415                        memset(&linkparam, 0, sizeof(linkparam));
 416
 417                        cfpkt_extr_head(pkt, &tmp, 1);
 418
 419                        serv = tmp & CFCTRL_SRV_MASK;
 420                        linkparam.linktype = serv;
 421
 422                        servtype = tmp >> 4;
 423                        linkparam.chtype = servtype;
 424
 425                        cfpkt_extr_head(pkt, &tmp, 1);
 426                        physlinkid = tmp & 0x07;
 427                        prio = tmp >> 3;
 428
 429                        linkparam.priority = prio;
 430                        linkparam.phyid = physlinkid;
 431                        cfpkt_extr_head(pkt, &endpoint, 1);
 432                        linkparam.endpoint = endpoint & 0x03;
 433
 434                        switch (serv) {
 435                        case CFCTRL_SRV_VEI:
 436                        case CFCTRL_SRV_DBG:
 437                                if (CFCTRL_ERR_BIT & cmdrsp)
 438                                        break;
 439                                /* Link ID */
 440                                cfpkt_extr_head(pkt, &linkid, 1);
 441                                break;
 442                        case CFCTRL_SRV_VIDEO:
 443                                cfpkt_extr_head(pkt, &tmp, 1);
 444                                linkparam.u.video.connid = tmp;
 445                                if (CFCTRL_ERR_BIT & cmdrsp)
 446                                        break;
 447                                /* Link ID */
 448                                cfpkt_extr_head(pkt, &linkid, 1);
 449                                break;
 450
 451                        case CFCTRL_SRV_DATAGRAM:
 452                                cfpkt_extr_head(pkt, &tmp32, 4);
 453                                linkparam.u.datagram.connid =
 454                                    le32_to_cpu(tmp32);
 455                                if (CFCTRL_ERR_BIT & cmdrsp)
 456                                        break;
 457                                /* Link ID */
 458                                cfpkt_extr_head(pkt, &linkid, 1);
 459                                break;
 460                        case CFCTRL_SRV_RFM:
 461                                /* Construct a frame, convert
 462                                 * DatagramConnectionID
 463                                 * to network format long and copy it out...
 464                                 */
 465                                cfpkt_extr_head(pkt, &tmp32, 4);
 466                                linkparam.u.rfm.connid =
 467                                  le32_to_cpu(tmp32);
 468                                cp = (u8 *) linkparam.u.rfm.volume;
 469                                for (cfpkt_extr_head(pkt, &tmp, 1);
 470                                     cfpkt_more(pkt) && tmp != '\0';
 471                                     cfpkt_extr_head(pkt, &tmp, 1))
 472                                        *cp++ = tmp;
 473                                *cp = '\0';
 474
 475                                if (CFCTRL_ERR_BIT & cmdrsp)
 476                                        break;
 477                                /* Link ID */
 478                                cfpkt_extr_head(pkt, &linkid, 1);
 479
 480                                break;
 481                        case CFCTRL_SRV_UTIL:
 482                                /* Construct a frame, convert
 483                                 * DatagramConnectionID
 484                                 * to network format long and copy it out...
 485                                 */
 486                                /* Fifosize KB */
 487                                cfpkt_extr_head(pkt, &tmp16, 2);
 488                                linkparam.u.utility.fifosize_kb =
 489                                    le16_to_cpu(tmp16);
 490                                /* Fifosize bufs */
 491                                cfpkt_extr_head(pkt, &tmp16, 2);
 492                                linkparam.u.utility.fifosize_bufs =
 493                                    le16_to_cpu(tmp16);
 494                                /* name */
 495                                cp = (u8 *) linkparam.u.utility.name;
 496                                caif_assert(sizeof(linkparam.u.utility.name)
 497                                             >= UTILITY_NAME_LENGTH);
 498                                for (i = 0;
 499                                     i < UTILITY_NAME_LENGTH
 500                                     && cfpkt_more(pkt); i++) {
 501                                        cfpkt_extr_head(pkt, &tmp, 1);
 502                                        *cp++ = tmp;
 503                                }
 504                                /* Length */
 505                                cfpkt_extr_head(pkt, &len, 1);
 506                                linkparam.u.utility.paramlen = len;
 507                                /* Param Data */
 508                                cp = linkparam.u.utility.params;
 509                                while (cfpkt_more(pkt) && len--) {
 510                                        cfpkt_extr_head(pkt, &tmp, 1);
 511                                        *cp++ = tmp;
 512                                }
 513                                if (CFCTRL_ERR_BIT & cmdrsp)
 514                                        break;
 515                                /* Link ID */
 516                                cfpkt_extr_head(pkt, &linkid, 1);
 517                                /* Length */
 518                                cfpkt_extr_head(pkt, &len, 1);
 519                                /* Param Data */
 520                                cfpkt_extr_head(pkt, &param, len);
 521                                break;
 522                        default:
 523                                pr_warning("CAIF: %s(): Request setup "
 524                                           "- invalid link type (%d)",
 525                                           __func__, serv);
 526                                goto error;
 527                        }
 528
 529                        rsp.cmd = cmd;
 530                        rsp.param = linkparam;
 531                        req = cfctrl_remove_req(cfctrl, &rsp);
 532
 533                        if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) ||
 534                                cfpkt_erroneous(pkt)) {
 535                                pr_err("CAIF: %s(): Invalid O/E bit or parse "
 536                                       "error on CAIF control channel",
 537                                        __func__);
 538                                cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
 539                                                       0,
 540                                                       req ? req->client_layer
 541                                                       : NULL);
 542                        } else {
 543                                cfctrl->res.linksetup_rsp(cfctrl->serv.
 544                                                          layer.up, linkid,
 545                                                          serv, physlinkid,
 546                                                          req ? req->
 547                                                          client_layer : NULL);
 548                        }
 549
 550                        if (req != NULL)
 551                                kfree(req);
 552                }
 553                break;
 554        case CFCTRL_CMD_LINK_DESTROY:
 555                cfpkt_extr_head(pkt, &linkid, 1);
 556                cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
 557                break;
 558        case CFCTRL_CMD_LINK_ERR:
 559                pr_err("CAIF: %s(): Frame Error Indication received\n",
 560                        __func__);
 561                cfctrl->res.linkerror_ind();
 562                break;
 563        case CFCTRL_CMD_ENUM:
 564                cfctrl->res.enum_rsp();
 565                break;
 566        case CFCTRL_CMD_SLEEP:
 567                cfctrl->res.sleep_rsp();
 568                break;
 569        case CFCTRL_CMD_WAKE:
 570                cfctrl->res.wake_rsp();
 571                break;
 572        case CFCTRL_CMD_LINK_RECONF:
 573                cfctrl->res.restart_rsp();
 574                break;
 575        case CFCTRL_CMD_RADIO_SET:
 576                cfctrl->res.radioset_rsp();
 577                break;
 578        default:
 579                pr_err("CAIF: %s(): Unrecognized Control Frame\n", __func__);
 580                goto error;
 581                break;
 582        }
 583        ret = 0;
 584error:
 585        cfpkt_destroy(pkt);
 586        return ret;
 587}
 588
 589static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
 590                        int phyid)
 591{
 592        struct cfctrl *this = container_obj(layr);
 593        switch (ctrl) {
 594        case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
 595        case CAIF_CTRLCMD_FLOW_OFF_IND:
 596                spin_lock(&this->info_list_lock);
 597                if (!list_empty(&this->list)) {
 598                        pr_debug("CAIF: %s(): Received flow off in "
 599                                   "control layer", __func__);
 600                }
 601                spin_unlock(&this->info_list_lock);
 602                break;
 603        default:
 604                break;
 605        }
 606}
 607
 608#ifndef CAIF_NO_LOOP
 609static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
 610{
 611        static int last_linkid;
 612        u8 linkid, linktype, tmp;
 613        switch (cmd) {
 614        case CFCTRL_CMD_LINK_SETUP:
 615                spin_lock(&ctrl->loop_linkid_lock);
 616                for (linkid = last_linkid + 1; linkid < 255; linkid++)
 617                        if (!ctrl->loop_linkused[linkid])
 618                                goto found;
 619                for (linkid = last_linkid - 1; linkid > 0; linkid--)
 620                        if (!ctrl->loop_linkused[linkid])
 621                                goto found;
 622                spin_unlock(&ctrl->loop_linkid_lock);
 623                pr_err("CAIF: %s(): Out of link-ids\n", __func__);
 624                return -EINVAL;
 625found:
 626                if (!ctrl->loop_linkused[linkid])
 627                        ctrl->loop_linkused[linkid] = 1;
 628
 629                last_linkid = linkid;
 630
 631                cfpkt_add_trail(pkt, &linkid, 1);
 632                spin_unlock(&ctrl->loop_linkid_lock);
 633                cfpkt_peek_head(pkt, &linktype, 1);
 634                if (linktype ==  CFCTRL_SRV_UTIL) {
 635                        tmp = 0x01;
 636                        cfpkt_add_trail(pkt, &tmp, 1);
 637                        cfpkt_add_trail(pkt, &tmp, 1);
 638                }
 639                break;
 640
 641        case CFCTRL_CMD_LINK_DESTROY:
 642                spin_lock(&ctrl->loop_linkid_lock);
 643                cfpkt_peek_head(pkt, &linkid, 1);
 644                ctrl->loop_linkused[linkid] = 0;
 645                spin_unlock(&ctrl->loop_linkid_lock);
 646                break;
 647        default:
 648                break;
 649        }
 650        return CAIF_SUCCESS;
 651}
 652#endif
 653