drivers/net/wireless/libertas/cmdresp.c

   1 /**
   2   * This file contains the handling of command
   3   * responses as well as events generated by firmware.
   4   */
   5 #include <linux/delay.h>
   6 #include <linux/sched.h>
   7 #include <linux/if_arp.h>
   8 #include <linux/netdevice.h>
   9 #include <asm/unaligned.h>
  10 #include <net/iw_handler.h>
  11
  12 #include "host.h"
  13 #include "decl.h"
  14 #include "cmd.h"
  15 #include "defs.h"
  16 #include "dev.h"
  17 #include "assoc.h"
  18 #include "wext.h"
  19
  20 /**
  21  *  @brief This function handles disconnect event. it
  22  *  reports disconnect to upper layer, clean tx/rx packets,
  23  *  reset link state etc.
  24  *
  25  *  @param priv    A pointer to struct lbs_private structure
  26  *  @return        n/a
  27  */
  28 void lbs_mac_event_disconnected(struct lbs_private *priv)
  29 {
  30         if (priv->connect_status != LBS_CONNECTED)
  31                 return;
  32
  33         lbs_deb_enter(LBS_DEB_ASSOC);
  34
  35         /*
  36          * Cisco AP sends EAP failure and de-auth in less than 0.5 ms.
  37          * It causes problem in the Supplicant
  38          */
  39         msleep_interruptible(1000);
  40         lbs_send_disconnect_notification(priv);
  41
  42         /* report disconnect to upper layer */
  43         netif_stop_queue(priv->dev);
  44         netif_carrier_off(priv->dev);
  45
  46         /* Free Tx and Rx packets */
  47         kfree_skb(priv->currenttxskb);
  48         priv->currenttxskb = NULL;
  49         priv->tx_pending_len = 0;
  50
  51         /* reset SNR/NF/RSSI values */
  52         memset(priv->SNR, 0x00, sizeof(priv->SNR));
  53         memset(priv->NF, 0x00, sizeof(priv->NF));
  54         memset(priv->RSSI, 0x00, sizeof(priv->RSSI));
  55         memset(priv->rawSNR, 0x00, sizeof(priv->rawSNR));
  56         memset(priv->rawNF, 0x00, sizeof(priv->rawNF));
  57         priv->nextSNRNF = 0;
  58         priv->numSNRNF = 0;
  59         priv->connect_status = LBS_DISCONNECTED;
  60
  61         /* Clear out associated SSID and BSSID since connection is
  62          * no longer valid.
  63          */
  64         memset(&priv->curbssparams.bssid, 0, ETH_ALEN);
  65         memset(&priv->curbssparams.ssid, 0, IEEE80211_MAX_SSID_LEN);
  66         priv->curbssparams.ssid_len = 0;
  67
  68         if (priv->psstate != PS_STATE_FULL_POWER) {
  69                 /* make firmware to exit PS mode */
  70                 lbs_deb_cmd("disconnected, so exit PS mode\n");
  71                 lbs_ps_wakeup(priv, 0);
  72         }
  73         lbs_deb_leave(LBS_DEB_ASSOC);
  74 }
  75
  76 static int lbs_ret_reg_access(struct lbs_private *priv,
  77                                u16 type, struct cmd_ds_command *resp)
  78 {
  79         int ret = 0;
  80
  81         lbs_deb_enter(LBS_DEB_CMD);
  82
  83         switch (type) {
  84         case CMD_RET(CMD_MAC_REG_ACCESS):
  85                 {
  86                         struct cmd_ds_mac_reg_access *reg = &resp->params.macreg;
  87
  88                         priv->offsetvalue.offset = (u32)le16_to_cpu(reg->offset);
  89                         priv->offsetvalue.value = le32_to_cpu(reg->value);
  90                         break;
  91                 }
  92
  93         case CMD_RET(CMD_BBP_REG_ACCESS):
  94                 {
  95                         struct cmd_ds_bbp_reg_access *reg = &resp->params.bbpreg;
  96
  97                         priv->offsetvalue.offset = (u32)le16_to_cpu(reg->offset);
  98                         priv->offsetvalue.value = reg->value;
  99                         break;
 100                 }
 101
 102         case CMD_RET(CMD_RF_REG_ACCESS):
 103                 {
 104                         struct cmd_ds_rf_reg_access *reg = &resp->params.rfreg;
 105
 106                         priv->offsetvalue.offset = (u32)le16_to_cpu(reg->offset);
 107                         priv->offsetvalue.value = reg->value;
 108                         break;
 109                 }
 110
 111         default:
 112                 ret = -1;
 113         }
 114
 115         lbs_deb_leave_args(LBS_DEB_CMD, "ret %d", ret);
 116         return ret;
 117 }
 118
 119 static inline int handle_cmd_response(struct lbs_private *priv,
 120                                       struct cmd_header *cmd_response)
 121 {
 122         struct cmd_ds_command *resp = (struct cmd_ds_command *) cmd_response;
 123         int ret = 0;
 124         unsigned long flags;
 125         uint16_t respcmd = le16_to_cpu(resp->command);
 126
 127         lbs_deb_enter(LBS_DEB_HOST);
 128
 129         switch (respcmd) {
 130         case CMD_RET(CMD_MAC_REG_ACCESS):
 131         case CMD_RET(CMD_BBP_REG_ACCESS):
 132         case CMD_RET(CMD_RF_REG_ACCESS):
 133                 ret = lbs_ret_reg_access(priv, respcmd, resp);
 134                 break;
 135
 136         case CMD_RET(CMD_802_11_SET_AFC):
 137         case CMD_RET(CMD_802_11_GET_AFC):
 138                 spin_lock_irqsave(&priv->driver_lock, flags);
 139                 memmove((void *)priv->cur_cmd->callback_arg, &resp->params.afc,
 140                         sizeof(struct cmd_ds_802_11_afc));
 141                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 142
 143                 break;
 144
 145         case CMD_RET(CMD_802_11_BEACON_STOP):
 146                 break;
 147
 148         case CMD_RET(CMD_802_11_RSSI):
 149                 ret = lbs_ret_802_11_rssi(priv, resp);
 150                 break;
 151
 152         case CMD_RET(CMD_802_11_TPC_CFG):
 153                 spin_lock_irqsave(&priv->driver_lock, flags);
 154                 memmove((void *)priv->cur_cmd->callback_arg, &resp->params.tpccfg,
 155                         sizeof(struct cmd_ds_802_11_tpc_cfg));
 156                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 157                 break;
 158
 159         case CMD_RET(CMD_BT_ACCESS):
 160                 spin_lock_irqsave(&priv->driver_lock, flags);
 161                 if (priv->cur_cmd->callback_arg)
 162                         memcpy((void *)priv->cur_cmd->callback_arg,
 163                                &resp->params.bt.addr1, 2 * ETH_ALEN);
 164                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 165                 break;
 166         case CMD_RET(CMD_FWT_ACCESS):
 167                 spin_lock_irqsave(&priv->driver_lock, flags);
 168                 if (priv->cur_cmd->callback_arg)
 169                         memcpy((void *)priv->cur_cmd->callback_arg, &resp->params.fwt,
 170                                sizeof(resp->params.fwt));
 171                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 172                 break;
 173         case CMD_RET(CMD_802_11_BEACON_CTRL):
 174                 ret = lbs_ret_802_11_bcn_ctrl(priv, resp);
 175                 break;
 176
 177         default:
 178                 lbs_pr_err("CMD_RESP: unknown cmd response 0x%04x\n",
 179                            le16_to_cpu(resp->command));
 180                 break;
 181         }
 182         lbs_deb_leave(LBS_DEB_HOST);
 183         return ret;
 184 }
 185
 186 int lbs_process_command_response(struct lbs_private *priv, u8 *data, u32 len)
 187 {
 188         uint16_t respcmd, curcmd;
 189         struct cmd_header *resp;
 190         int ret = 0;
 191         unsigned long flags;
 192         uint16_t result;
 193
 194         lbs_deb_enter(LBS_DEB_HOST);
 195
 196         mutex_lock(&priv->lock);
 197         spin_lock_irqsave(&priv->driver_lock, flags);
 198
 199         if (!priv->cur_cmd) {
 200                 lbs_deb_host("CMD_RESP: cur_cmd is NULL\n");
 201                 ret = -1;
 202                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 203                 goto done;
 204         }
 205
 206         resp = (void *)data;
 207         curcmd = le16_to_cpu(priv->cur_cmd->cmdbuf->command);
 208         respcmd = le16_to_cpu(resp->command);
 209         result = le16_to_cpu(resp->result);
 210
 211         lbs_deb_cmd("CMD_RESP: response 0x%04x, seq %d, size %d\n",
 212                      respcmd, le16_to_cpu(resp->seqnum), len);
 213         lbs_deb_hex(LBS_DEB_CMD, "CMD_RESP", (void *) resp, len);
 214
 215         if (resp->seqnum != priv->cur_cmd->cmdbuf->seqnum) {
 216                 lbs_pr_info("Received CMD_RESP with invalid sequence %d (expected %d)\n",
 217                             le16_to_cpu(resp->seqnum), le16_to_cpu(priv->cur_cmd->cmdbuf->seqnum));
 218                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 219                 ret = -1;
 220                 goto done;
 221         }
 222         if (respcmd != CMD_RET(curcmd) &&
 223             respcmd != CMD_RET_802_11_ASSOCIATE && curcmd != CMD_802_11_ASSOCIATE) {
 224                 lbs_pr_info("Invalid CMD_RESP %x to command %x!\n", respcmd, curcmd);
 225                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 226                 ret = -1;
 227                 goto done;
 228         }
 229
 230         if (resp->result == cpu_to_le16(0x0004)) {
 231                 /* 0x0004 means -EAGAIN. Drop the response, let it time out
 232                    and be resubmitted */
 233                 lbs_pr_info("Firmware returns DEFER to command %x. Will let it time out...\n",
 234                             le16_to_cpu(resp->command));
 235                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 236                 ret = -1;
 237                 goto done;
 238         }
 239
 240         /* Now we got response from FW, cancel the command timer */
 241         del_timer(&priv->command_timer);
 242         priv->cmd_timed_out = 0;
 243
 244         /* Store the response code to cur_cmd_retcode. */
 245         priv->cur_cmd_retcode = result;
 246
 247         if (respcmd == CMD_RET(CMD_802_11_PS_MODE)) {
 248                 struct cmd_ds_802_11_ps_mode *psmode = (void *) &resp[1];
 249                 u16 action = le16_to_cpu(psmode->action);
 250
 251                 lbs_deb_host(
 252                        "CMD_RESP: PS_MODE cmd reply result 0x%x, action 0x%x\n",
 253                        result, action);
 254
 255                 if (result) {
 256                         lbs_deb_host("CMD_RESP: PS command failed with 0x%x\n",
 257                                     result);
 258                         /*
 259                          * We should not re-try enter-ps command in
 260                          * ad-hoc mode. It takes place in
 261                          * lbs_execute_next_command().
 262                          */
 263                         if (priv->mode == IW_MODE_ADHOC &&
 264                             action == CMD_SUBCMD_ENTER_PS)
 265                                 priv->psmode = LBS802_11POWERMODECAM;
 266                 } else if (action == CMD_SUBCMD_ENTER_PS) {
 267                         priv->needtowakeup = 0;
 268                         priv->psstate = PS_STATE_AWAKE;
 269
 270                         lbs_deb_host("CMD_RESP: ENTER_PS command response\n");
 271                         if (priv->connect_status != LBS_CONNECTED) {
 272                                 /*
 273                                  * When Deauth Event received before Enter_PS command
 274                                  * response, We need to wake up the firmware.
 275                                  */
 276                                 lbs_deb_host(
 277                                        "disconnected, invoking lbs_ps_wakeup\n");
 278
 279                                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 280                                 mutex_unlock(&priv->lock);
 281                                 lbs_ps_wakeup(priv, 0);
 282                                 mutex_lock(&priv->lock);
 283                                 spin_lock_irqsave(&priv->driver_lock, flags);
 284                         }
 285                 } else if (action == CMD_SUBCMD_EXIT_PS) {
 286                         priv->needtowakeup = 0;
 287                         priv->psstate = PS_STATE_FULL_POWER;
 288                         lbs_deb_host("CMD_RESP: EXIT_PS command response\n");
 289                 } else {
 290                         lbs_deb_host("CMD_RESP: PS action 0x%X\n", action);
 291                 }
 292
 293                 lbs_complete_command(priv, priv->cur_cmd, result);
 294                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 295
 296                 ret = 0;
 297                 goto done;
 298         }
 299
 300         /* If the command is not successful, cleanup and return failure */
 301         if ((result != 0 || !(respcmd & 0x8000))) {
 302                 lbs_deb_host("CMD_RESP: error 0x%04x in command reply 0x%04x\n",
 303                        result, respcmd);
 304                 /*
 305                  * Handling errors here
 306                  */
 307                 switch (respcmd) {
 308                 case CMD_RET(CMD_GET_HW_SPEC):
 309                 case CMD_RET(CMD_802_11_RESET):
 310                         lbs_deb_host("CMD_RESP: reset failed\n");
 311                         break;
 312
 313                 }
 314                 lbs_complete_command(priv, priv->cur_cmd, result);
 315                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 316
 317                 ret = -1;
 318                 goto done;
 319         }
 320
 321         spin_unlock_irqrestore(&priv->driver_lock, flags);
 322
 323         if (priv->cur_cmd && priv->cur_cmd->callback) {
 324                 ret = priv->cur_cmd->callback(priv, priv->cur_cmd->callback_arg,
 325                                 resp);
 326         } else
 327                 ret = handle_cmd_response(priv, resp);
 328
 329         spin_lock_irqsave(&priv->driver_lock, flags);
 330
 331         if (priv->cur_cmd) {
 332                 /* Clean up and Put current command back to cmdfreeq */
 333                 lbs_complete_command(priv, priv->cur_cmd, result);
 334         }
 335         spin_unlock_irqrestore(&priv->driver_lock, flags);
 336
 337 done:
 338         mutex_unlock(&priv->lock);
 339         lbs_deb_leave_args(LBS_DEB_HOST, "ret %d", ret);
 340         return ret;
 341 }
 342
 343 static int lbs_send_confirmwake(struct lbs_private *priv)
 344 {
 345         struct cmd_header cmd;
 346         int ret = 0;
 347
 348         lbs_deb_enter(LBS_DEB_HOST);
 349
 350         cmd.command = cpu_to_le16(CMD_802_11_WAKEUP_CONFIRM);
 351         cmd.size = cpu_to_le16(sizeof(cmd));
 352         cmd.seqnum = cpu_to_le16(++priv->seqnum);
 353         cmd.result = 0;
 354
 355         lbs_deb_hex(LBS_DEB_HOST, "wake confirm", (u8 *) &cmd,
 356                 sizeof(cmd));
 357
 358         ret = priv->hw_host_to_card(priv, MVMS_CMD, (u8 *) &cmd, sizeof(cmd));
 359         if (ret)
 360                 lbs_pr_alert("SEND_WAKEC_CMD: Host to Card failed for Confirm Wake\n");
 361
 362         lbs_deb_leave_args(LBS_DEB_HOST, "ret %d", ret);
 363         return ret;
 364 }
 365
 366 int lbs_process_event(struct lbs_private *priv, u32 event)
 367 {
 368         int ret = 0;
 369
 370         lbs_deb_enter(LBS_DEB_CMD);
 371
 372         switch (event) {
 373         case MACREG_INT_CODE_LINK_SENSED:
 374                 lbs_deb_cmd("EVENT: link sensed\n");
 375                 break;
 376
 377         case MACREG_INT_CODE_DEAUTHENTICATED:
 378                 lbs_deb_cmd("EVENT: deauthenticated\n");
 379                 lbs_mac_event_disconnected(priv);
 380                 break;
 381
 382         case MACREG_INT_CODE_DISASSOCIATED:
 383                 lbs_deb_cmd("EVENT: disassociated\n");
 384                 lbs_mac_event_disconnected(priv);
 385                 break;
 386
 387         case MACREG_INT_CODE_LINK_LOST_NO_SCAN:
 388                 lbs_deb_cmd("EVENT: link lost\n");
 389                 lbs_mac_event_disconnected(priv);
 390                 break;
 391
 392         case MACREG_INT_CODE_PS_SLEEP:
 393                 lbs_deb_cmd("EVENT: ps sleep\n");
 394
 395                 /* handle unexpected PS SLEEP event */
 396                 if (priv->psstate == PS_STATE_FULL_POWER) {
 397                         lbs_deb_cmd(
 398                                "EVENT: in FULL POWER mode, ignoreing PS_SLEEP\n");
 399                         break;
 400                 }
 401                 priv->psstate = PS_STATE_PRE_SLEEP;
 402
 403                 lbs_ps_confirm_sleep(priv);
 404
 405                 break;
 406
 407         case MACREG_INT_CODE_HOST_AWAKE:
 408                 lbs_deb_cmd("EVENT: host awake\n");
 409                 if (priv->reset_deep_sleep_wakeup)
 410                         priv->reset_deep_sleep_wakeup(priv);
 411                 priv->is_deep_sleep = 0;
 412                 lbs_send_confirmwake(priv);
 413                 break;
 414
 415         case MACREG_INT_CODE_DEEP_SLEEP_AWAKE:
 416                 if (priv->reset_deep_sleep_wakeup)
 417                         priv->reset_deep_sleep_wakeup(priv);
 418                 lbs_deb_cmd("EVENT: ds awake\n");
 419                 priv->is_deep_sleep = 0;
 420                 priv->wakeup_dev_required = 0;
 421                 wake_up_interruptible(&priv->ds_awake_q);
 422                 break;
 423
 424         case MACREG_INT_CODE_PS_AWAKE:
 425                 lbs_deb_cmd("EVENT: ps awake\n");
 426                 /* handle unexpected PS AWAKE event */
 427                 if (priv->psstate == PS_STATE_FULL_POWER) {
 428                         lbs_deb_cmd(
 429                                "EVENT: In FULL POWER mode - ignore PS AWAKE\n");
 430                         break;
 431                 }
 432
 433                 priv->psstate = PS_STATE_AWAKE;
 434
 435                 if (priv->needtowakeup) {
 436                         /*
 437                          * wait for the command processing to finish
 438                          * before resuming sending
 439                          * priv->needtowakeup will be set to FALSE
 440                          * in lbs_ps_wakeup()
 441                          */
 442                         lbs_deb_cmd("waking up ...\n");
 443                         lbs_ps_wakeup(priv, 0);
 444                 }
 445                 break;
 446
 447         case MACREG_INT_CODE_MIC_ERR_UNICAST:
 448                 lbs_deb_cmd("EVENT: UNICAST MIC ERROR\n");
 449                 lbs_send_mic_failureevent(priv, event);
 450                 break;
 451
 452         case MACREG_INT_CODE_MIC_ERR_MULTICAST:
 453                 lbs_deb_cmd("EVENT: MULTICAST MIC ERROR\n");
 454                 lbs_send_mic_failureevent(priv, event);
 455                 break;
 456
 457         case MACREG_INT_CODE_MIB_CHANGED:
 458                 lbs_deb_cmd("EVENT: MIB CHANGED\n");
 459                 break;
 460         case MACREG_INT_CODE_INIT_DONE:
 461                 lbs_deb_cmd("EVENT: INIT DONE\n");
 462                 break;
 463         case MACREG_INT_CODE_ADHOC_BCN_LOST:
 464                 lbs_deb_cmd("EVENT: ADHOC beacon lost\n");
 465                 break;
 466         case MACREG_INT_CODE_RSSI_LOW:
 467                 lbs_pr_alert("EVENT: rssi low\n");
 468                 break;
 469         case MACREG_INT_CODE_SNR_LOW:
 470                 lbs_pr_alert("EVENT: snr low\n");
 471                 break;
 472         case MACREG_INT_CODE_MAX_FAIL:
 473                 lbs_pr_alert("EVENT: max fail\n");
 474                 break;
 475         case MACREG_INT_CODE_RSSI_HIGH:
 476                 lbs_pr_alert("EVENT: rssi high\n");
 477                 break;
 478         case MACREG_INT_CODE_SNR_HIGH:
 479                 lbs_pr_alert("EVENT: snr high\n");
 480                 break;
 481
 482         case MACREG_INT_CODE_MESH_AUTO_STARTED:
 483                 /* Ignore spurious autostart events */
 484                 lbs_pr_info("EVENT: MESH_AUTO_STARTED (ignoring)\n");
 485                 break;
 486
 487         default:
 488                 lbs_pr_alert("EVENT: unknown event id %d\n", event);
 489                 break;
 490         }
 491
 492         lbs_deb_leave_args(LBS_DEB_CMD, "ret %d", ret);
 493         return ret;
 494 }