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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 #include <linux/kernel.h>
   7 #include <linux/stddef.h>
   8 #include <linux/slab.h>
   9 #include <net/caif/caif_layer.h>
  10 #include <net/caif/cfpkt.h>
  11 #include <net/caif/cfcnfg.h>
  12 #include <net/caif/cfctrl.h>
  13 #include <net/caif/cfmuxl.h>
  14 #include <net/caif/cffrml.h>
  15 #include <net/caif/cfserl.h>
  16 #include <net/caif/cfsrvl.h>
  17
  18 #include <linux/module.h>
  19 #include <asm/atomic.h>
  20
  21 #define MAX_PHY_LAYERS 7
  22 #define PHY_NAME_LEN 20
  23
  24 #define container_obj(layr) container_of(layr, struct cfcnfg, layer)
  25
  26 /* Information about CAIF physical interfaces held by Config Module in order
  27  * to manage physical interfaces
  28  */
  29 struct cfcnfg_phyinfo {
  30         /* Pointer to the layer below the MUX (framing layer) */
  31         struct cflayer *frm_layer;
  32         /* Pointer to the lowest actual physical layer */
  33         struct cflayer *phy_layer;
  34         /* Unique identifier of the physical interface */
  35         unsigned int id;
  36         /* Preference of the physical in interface */
  37         enum cfcnfg_phy_preference pref;
  38
  39         /* Reference count, number of channels using the device */
  40         int phy_ref_count;
  41
  42         /* Information about the physical device */
  43         struct dev_info dev_info;
  44 };
  45
  46 struct cfcnfg {
  47         struct cflayer layer;
  48         struct cflayer *ctrl;
  49         struct cflayer *mux;
  50         u8 last_phyid;
  51         struct cfcnfg_phyinfo phy_layers[MAX_PHY_LAYERS];
  52 };
  53
  54 static void cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id,
  55                              enum cfctrl_srv serv, u8 phyid,
  56                              struct cflayer *adapt_layer);
  57 static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id);
  58 static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id,
  59                              struct cflayer *adapt_layer);
  60 static void cfctrl_resp_func(void);
  61 static void cfctrl_enum_resp(void);
  62
  63 struct cfcnfg *cfcnfg_create(void)
  64 {
  65         struct cfcnfg *this;
  66         struct cfctrl_rsp *resp;
  67         /* Initiate this layer */
  68         this = kzalloc(sizeof(struct cfcnfg), GFP_ATOMIC);
  69         if (!this) {
  70                 pr_warning("CAIF: %s(): Out of memory\n", __func__);
  71                 return NULL;
  72         }
  73         this->mux = cfmuxl_create();
  74         if (!this->mux)
  75                 goto out_of_mem;
  76         this->ctrl = cfctrl_create();
  77         if (!this->ctrl)
  78                 goto out_of_mem;
  79         /* Initiate response functions */
  80         resp = cfctrl_get_respfuncs(this->ctrl);
  81         resp->enum_rsp = cfctrl_enum_resp;
  82         resp->linkerror_ind = cfctrl_resp_func;
  83         resp->linkdestroy_rsp = cfcnfg_linkdestroy_rsp;
  84         resp->sleep_rsp = cfctrl_resp_func;
  85         resp->wake_rsp = cfctrl_resp_func;
  86         resp->restart_rsp = cfctrl_resp_func;
  87         resp->radioset_rsp = cfctrl_resp_func;
  88         resp->linksetup_rsp = cfcnfg_linkup_rsp;
  89         resp->reject_rsp = cfcnfg_reject_rsp;
  90
  91         this->last_phyid = 1;
  92
  93         cfmuxl_set_uplayer(this->mux, this->ctrl, 0);
  94         layer_set_dn(this->ctrl, this->mux);
  95         layer_set_up(this->ctrl, this);
  96         return this;
  97 out_of_mem:
  98         pr_warning("CAIF: %s(): Out of memory\n", __func__);
  99         kfree(this->mux);
 100         kfree(this->ctrl);
 101         kfree(this);
 102         return NULL;
 103 }
 104 EXPORT_SYMBOL(cfcnfg_create);
 105
 106 void cfcnfg_remove(struct cfcnfg *cfg)
 107 {
 108         if (cfg) {
 109                 kfree(cfg->mux);
 110                 kfree(cfg->ctrl);
 111                 kfree(cfg);
 112         }
 113 }
 114
 115 static void cfctrl_resp_func(void)
 116 {
 117 }
 118
 119 static void cfctrl_enum_resp(void)
 120 {
 121 }
 122
 123 struct dev_info *cfcnfg_get_phyid(struct cfcnfg *cnfg,
 124                                   enum cfcnfg_phy_preference phy_pref)
 125 {
 126         u16 i;
 127
 128         /* Try to match with specified preference */
 129         for (i = 1; i < MAX_PHY_LAYERS; i++) {
 130                 if (cnfg->phy_layers[i].id == i &&
 131                      cnfg->phy_layers[i].pref == phy_pref &&
 132                      cnfg->phy_layers[i].frm_layer != NULL) {
 133                         caif_assert(cnfg->phy_layers != NULL);
 134                         caif_assert(cnfg->phy_layers[i].id == i);
 135                         return &cnfg->phy_layers[i].dev_info;
 136                 }
 137         }
 138         /* Otherwise just return something */
 139         for (i = 1; i < MAX_PHY_LAYERS; i++) {
 140                 if (cnfg->phy_layers[i].id == i) {
 141                         caif_assert(cnfg->phy_layers != NULL);
 142                         caif_assert(cnfg->phy_layers[i].id == i);
 143                         return &cnfg->phy_layers[i].dev_info;
 144                 }
 145         }
 146
 147         return NULL;
 148 }
 149
 150 static struct cfcnfg_phyinfo *cfcnfg_get_phyinfo(struct cfcnfg *cnfg,
 151                                                         u8 phyid)
 152 {
 153         int i;
 154         /* Try to match with specified preference */
 155         for (i = 0; i < MAX_PHY_LAYERS; i++)
 156                 if (cnfg->phy_layers[i].frm_layer != NULL &&
 157                     cnfg->phy_layers[i].id == phyid)
 158                         return &cnfg->phy_layers[i];
 159         return NULL;
 160 }
 161
 162 int cfcnfg_get_named(struct cfcnfg *cnfg, char *name)
 163 {
 164         int i;
 165
 166         /* Try to match with specified name */
 167         for (i = 0; i < MAX_PHY_LAYERS; i++) {
 168                 if (cnfg->phy_layers[i].frm_layer != NULL
 169                     && strcmp(cnfg->phy_layers[i].phy_layer->name,
 170                               name) == 0)
 171                         return cnfg->phy_layers[i].frm_layer->id;
 172         }
 173         return 0;
 174 }
 175
 176 int cfcnfg_disconn_adapt_layer(struct cfcnfg *cnfg, struct cflayer *adap_layer)
 177 {
 178         u8 channel_id = 0;
 179         int ret = 0;
 180         struct cflayer *servl = NULL;
 181         struct cfcnfg_phyinfo *phyinfo = NULL;
 182         u8 phyid = 0;
 183         caif_assert(adap_layer != NULL);
 184         channel_id = adap_layer->id;
 185         if (adap_layer->dn == NULL || channel_id == 0) {
 186                 pr_err("CAIF: %s():adap_layer->id is 0\n", __func__);
 187                 ret = -ENOTCONN;
 188                 goto end;
 189         }
 190         servl = cfmuxl_remove_uplayer(cnfg->mux, channel_id);
 191         if (servl == NULL)
 192                 goto end;
 193         layer_set_up(servl, NULL);
 194         ret = cfctrl_linkdown_req(cnfg->ctrl, channel_id, adap_layer);
 195         if (servl == NULL) {
 196                 pr_err("CAIF: %s(): PROTOCOL ERROR "
 197                        "- Error removing service_layer Channel_Id(%d)",
 198                         __func__, channel_id);
 199                 ret = -EINVAL;
 200                 goto end;
 201         }
 202         caif_assert(channel_id == servl->id);
 203         if (adap_layer->dn != NULL) {
 204                 phyid = cfsrvl_getphyid(adap_layer->dn);
 205
 206                 phyinfo = cfcnfg_get_phyinfo(cnfg, phyid);
 207                 if (phyinfo == NULL) {
 208                         pr_warning("CAIF: %s(): "
 209                                 "No interface to send disconnect to\n",
 210                                 __func__);
 211                         ret = -ENODEV;
 212                         goto end;
 213                 }
 214                 if (phyinfo->id != phyid ||
 215                         phyinfo->phy_layer->id != phyid ||
 216                         phyinfo->frm_layer->id != phyid) {
 217                         pr_err("CAIF: %s(): "
 218                                 "Inconsistency in phy registration\n",
 219                                 __func__);
 220                         ret = -EINVAL;
 221                         goto end;
 222                 }
 223         }
 224         if (phyinfo != NULL && --phyinfo->phy_ref_count == 0 &&
 225                 phyinfo->phy_layer != NULL &&
 226                 phyinfo->phy_layer->modemcmd != NULL) {
 227                 phyinfo->phy_layer->modemcmd(phyinfo->phy_layer,
 228                                              _CAIF_MODEMCMD_PHYIF_USELESS);
 229         }
 230 end:
 231         cfsrvl_put(servl);
 232         cfctrl_cancel_req(cnfg->ctrl, adap_layer);
 233         if (adap_layer->ctrlcmd != NULL)
 234                 adap_layer->ctrlcmd(adap_layer, CAIF_CTRLCMD_DEINIT_RSP, 0);
 235         return ret;
 236
 237 }
 238 EXPORT_SYMBOL(cfcnfg_disconn_adapt_layer);
 239
 240 void cfcnfg_release_adap_layer(struct cflayer *adap_layer)
 241 {
 242         if (adap_layer->dn)
 243                 cfsrvl_put(adap_layer->dn);
 244 }
 245 EXPORT_SYMBOL(cfcnfg_release_adap_layer);
 246
 247 static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id)
 248 {
 249 }
 250
 251 int cfcnfg_add_adaptation_layer(struct cfcnfg *cnfg,
 252                                 struct cfctrl_link_param *param,
 253                                 struct cflayer *adap_layer)
 254 {
 255         struct cflayer *frml;
 256         if (adap_layer == NULL) {
 257                 pr_err("CAIF: %s(): adap_layer is zero", __func__);
 258                 return -EINVAL;
 259         }
 260         if (adap_layer->receive == NULL) {
 261                 pr_err("CAIF: %s(): adap_layer->receive is NULL", __func__);
 262                 return -EINVAL;
 263         }
 264         if (adap_layer->ctrlcmd == NULL) {
 265                 pr_err("CAIF: %s(): adap_layer->ctrlcmd == NULL", __func__);
 266                 return -EINVAL;
 267         }
 268         frml = cnfg->phy_layers[param->phyid].frm_layer;
 269         if (frml == NULL) {
 270                 pr_err("CAIF: %s(): Specified PHY type does not exist!",
 271                         __func__);
 272                 return -ENODEV;
 273         }
 274         caif_assert(param->phyid == cnfg->phy_layers[param->phyid].id);
 275         caif_assert(cnfg->phy_layers[param->phyid].frm_layer->id ==
 276                      param->phyid);
 277         caif_assert(cnfg->phy_layers[param->phyid].phy_layer->id ==
 278                      param->phyid);
 279         /* FIXME: ENUMERATE INITIALLY WHEN ACTIVATING PHYSICAL INTERFACE */
 280         cfctrl_enum_req(cnfg->ctrl, param->phyid);
 281         return cfctrl_linkup_request(cnfg->ctrl, param, adap_layer);
 282 }
 283 EXPORT_SYMBOL(cfcnfg_add_adaptation_layer);
 284
 285 static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id,
 286                              struct cflayer *adapt_layer)
 287 {
 288         if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL)
 289                 adapt_layer->ctrlcmd(adapt_layer,
 290                                      CAIF_CTRLCMD_INIT_FAIL_RSP, 0);
 291 }
 292
 293 static void
 294 cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id, enum cfctrl_srv serv,
 295                  u8 phyid, struct cflayer *adapt_layer)
 296 {
 297         struct cfcnfg *cnfg = container_obj(layer);
 298         struct cflayer *servicel = NULL;
 299         struct cfcnfg_phyinfo *phyinfo;
 300         if (adapt_layer == NULL) {
 301                 pr_debug("CAIF: %s(): link setup response "
 302                                 "but no client exist, send linkdown back\n",
 303                                 __func__);
 304                 cfctrl_linkdown_req(cnfg->ctrl, channel_id, NULL);
 305                 return;
 306         }
 307
 308         caif_assert(cnfg != NULL);
 309         caif_assert(phyid != 0);
 310         phyinfo = &cnfg->phy_layers[phyid];
 311         caif_assert(phyinfo != NULL);
 312         caif_assert(phyinfo->id == phyid);
 313         caif_assert(phyinfo->phy_layer != NULL);
 314         caif_assert(phyinfo->phy_layer->id == phyid);
 315
 316         if (phyinfo != NULL &&
 317             phyinfo->phy_ref_count++ == 0 &&
 318             phyinfo->phy_layer != NULL &&
 319             phyinfo->phy_layer->modemcmd != NULL) {
 320                 caif_assert(phyinfo->phy_layer->id == phyid);
 321                 phyinfo->phy_layer->modemcmd(phyinfo->phy_layer,
 322                                              _CAIF_MODEMCMD_PHYIF_USEFULL);
 323
 324         }
 325         adapt_layer->id = channel_id;
 326
 327         switch (serv) {
 328         case CFCTRL_SRV_VEI:
 329                 servicel = cfvei_create(channel_id, &phyinfo->dev_info);
 330                 break;
 331         case CFCTRL_SRV_DATAGRAM:
 332                 servicel = cfdgml_create(channel_id, &phyinfo->dev_info);
 333                 break;
 334         case CFCTRL_SRV_RFM:
 335                 servicel = cfrfml_create(channel_id, &phyinfo->dev_info);
 336                 break;
 337         case CFCTRL_SRV_UTIL:
 338                 servicel = cfutill_create(channel_id, &phyinfo->dev_info);
 339                 break;
 340         case CFCTRL_SRV_VIDEO:
 341                 servicel = cfvidl_create(channel_id, &phyinfo->dev_info);
 342                 break;
 343         case CFCTRL_SRV_DBG:
 344                 servicel = cfdbgl_create(channel_id, &phyinfo->dev_info);
 345                 break;
 346         default:
 347                 pr_err("CAIF: %s(): Protocol error. "
 348                         "Link setup response - unknown channel type\n",
 349                         __func__);
 350                 return;
 351         }
 352         if (!servicel) {
 353                 pr_warning("CAIF: %s(): Out of memory\n", __func__);
 354                 return;
 355         }
 356         layer_set_dn(servicel, cnfg->mux);
 357         cfmuxl_set_uplayer(cnfg->mux, servicel, channel_id);
 358         layer_set_up(servicel, adapt_layer);
 359         layer_set_dn(adapt_layer, servicel);
 360         cfsrvl_get(servicel);
 361         servicel->ctrlcmd(servicel, CAIF_CTRLCMD_INIT_RSP, 0);
 362 }
 363
 364 void
 365 cfcnfg_add_phy_layer(struct cfcnfg *cnfg, enum cfcnfg_phy_type phy_type,
 366                      void *dev, struct cflayer *phy_layer, u16 *phyid,
 367                      enum cfcnfg_phy_preference pref,
 368                      bool fcs, bool stx)
 369 {
 370         struct cflayer *frml;
 371         struct cflayer *phy_driver = NULL;
 372         int i;
 373
 374
 375         if (cnfg->phy_layers[cnfg->last_phyid].frm_layer == NULL) {
 376                 *phyid = cnfg->last_phyid;
 377
 378                 /* range: * 1..(MAX_PHY_LAYERS-1) */
 379                 cnfg->last_phyid =
 380                     (cnfg->last_phyid % (MAX_PHY_LAYERS - 1)) + 1;
 381         } else {
 382                 *phyid = 0;
 383                 for (i = 1; i < MAX_PHY_LAYERS; i++) {
 384                         if (cnfg->phy_layers[i].frm_layer == NULL) {
 385                                 *phyid = i;
 386                                 break;
 387                         }
 388                 }
 389         }
 390         if (*phyid == 0) {
 391                 pr_err("CAIF: %s(): No Available PHY ID\n", __func__);
 392                 return;
 393         }
 394
 395         switch (phy_type) {
 396         case CFPHYTYPE_FRAG:
 397                 phy_driver =
 398                     cfserl_create(CFPHYTYPE_FRAG, *phyid, stx);
 399                 if (!phy_driver) {
 400                         pr_warning("CAIF: %s(): Out of memory\n", __func__);
 401                         return;
 402                 }
 403
 404                 break;
 405         case CFPHYTYPE_CAIF:
 406                 phy_driver = NULL;
 407                 break;
 408         default:
 409                 pr_err("CAIF: %s(): %d", __func__, phy_type);
 410                 return;
 411                 break;
 412         }
 413
 414         phy_layer->id = *phyid;
 415         cnfg->phy_layers[*phyid].pref = pref;
 416         cnfg->phy_layers[*phyid].id = *phyid;
 417         cnfg->phy_layers[*phyid].dev_info.id = *phyid;
 418         cnfg->phy_layers[*phyid].dev_info.dev = dev;
 419         cnfg->phy_layers[*phyid].phy_layer = phy_layer;
 420         cnfg->phy_layers[*phyid].phy_ref_count = 0;
 421         phy_layer->type = phy_type;
 422         frml = cffrml_create(*phyid, fcs);
 423         if (!frml) {
 424                 pr_warning("CAIF: %s(): Out of memory\n", __func__);
 425                 return;
 426         }
 427         cnfg->phy_layers[*phyid].frm_layer = frml;
 428         cfmuxl_set_dnlayer(cnfg->mux, frml, *phyid);
 429         layer_set_up(frml, cnfg->mux);
 430
 431         if (phy_driver != NULL) {
 432                 phy_driver->id = *phyid;
 433                 layer_set_dn(frml, phy_driver);
 434                 layer_set_up(phy_driver, frml);
 435                 layer_set_dn(phy_driver, phy_layer);
 436                 layer_set_up(phy_layer, phy_driver);
 437         } else {
 438                 layer_set_dn(frml, phy_layer);
 439                 layer_set_up(phy_layer, frml);
 440         }
 441 }
 442 EXPORT_SYMBOL(cfcnfg_add_phy_layer);
 443
 444 int cfcnfg_del_phy_layer(struct cfcnfg *cnfg, struct cflayer *phy_layer)
 445 {
 446         struct cflayer *frml, *frml_dn;
 447         u16 phyid;
 448         phyid = phy_layer->id;
 449         caif_assert(phyid == cnfg->phy_layers[phyid].id);
 450         caif_assert(phy_layer == cnfg->phy_layers[phyid].phy_layer);
 451         caif_assert(phy_layer->id == phyid);
 452         caif_assert(cnfg->phy_layers[phyid].frm_layer->id == phyid);
 453
 454         memset(&cnfg->phy_layers[phy_layer->id], 0,
 455                sizeof(struct cfcnfg_phyinfo));
 456         frml = cfmuxl_remove_dnlayer(cnfg->mux, phy_layer->id);
 457         frml_dn = frml->dn;
 458         cffrml_set_uplayer(frml, NULL);
 459         cffrml_set_dnlayer(frml, NULL);
 460         kfree(frml);
 461
 462         if (phy_layer != frml_dn) {
 463                 layer_set_up(frml_dn, NULL);
 464                 layer_set_dn(frml_dn, NULL);
 465                 kfree(frml_dn);
 466         }
 467         layer_set_up(phy_layer, NULL);
 468         return 0;
 469 }
 470 EXPORT_SYMBOL(cfcnfg_del_phy_layer);