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/slab.h>
   6 #include <linux/delay.h>
   7 #include <linux/sched.h>
   8 #include <asm/unaligned.h>
   9 #include <net/cfg80211.h>
  10
  11 #include "cfg.h"
  12 #include "cmd.h"
  13
  14 /**
  15  *  @brief This function handles disconnect event. it
  16  *  reports disconnect to upper layer, clean tx/rx packets,
  17  *  reset link state etc.
  18  *
  19  *  @param priv    A pointer to struct lbs_private structure
  20  *  @return        n/a
  21  */
  22 void lbs_mac_event_disconnected(struct lbs_private *priv)
  23 {
  24         if (priv->connect_status != LBS_CONNECTED)
  25                 return;
  26
  27         lbs_deb_enter(LBS_DEB_ASSOC);
  28
  29         /*
  30          * Cisco AP sends EAP failure and de-auth in less than 0.5 ms.
  31          * It causes problem in the Supplicant
  32          */
  33         msleep_interruptible(1000);
  34
  35         if (priv->wdev->iftype == NL80211_IFTYPE_STATION)
  36                 lbs_send_disconnect_notification(priv);
  37
  38         /* report disconnect to upper layer */
  39         netif_stop_queue(priv->dev);
  40         netif_carrier_off(priv->dev);
  41
  42         /* Free Tx and Rx packets */
  43         kfree_skb(priv->currenttxskb);
  44         priv->currenttxskb = NULL;
  45         priv->tx_pending_len = 0;
  46
  47         priv->connect_status = LBS_DISCONNECTED;
  48
  49         if (priv->psstate != PS_STATE_FULL_POWER) {
  50                 /* make firmware to exit PS mode */
  51                 lbs_deb_cmd("disconnected, so exit PS mode\n");
  52                 lbs_ps_wakeup(priv, 0);
  53         }
  54         lbs_deb_leave(LBS_DEB_ASSOC);
  55 }
  56
  57 static int lbs_ret_reg_access(struct lbs_private *priv,
  58                                u16 type, struct cmd_ds_command *resp)
  59 {
  60         int ret = 0;
  61
  62         lbs_deb_enter(LBS_DEB_CMD);
  63
  64         switch (type) {
  65         case CMD_RET(CMD_MAC_REG_ACCESS):
  66                 {
  67                         struct cmd_ds_mac_reg_access *reg = &resp->params.macreg;
  68
  69                         priv->offsetvalue.offset = (u32)le16_to_cpu(reg->offset);
  70                         priv->offsetvalue.value = le32_to_cpu(reg->value);
  71                         break;
  72                 }
  73
  74         case CMD_RET(CMD_BBP_REG_ACCESS):
  75                 {
  76                         struct cmd_ds_bbp_reg_access *reg = &resp->params.bbpreg;
  77
  78                         priv->offsetvalue.offset = (u32)le16_to_cpu(reg->offset);
  79                         priv->offsetvalue.value = reg->value;
  80                         break;
  81                 }
  82
  83         case CMD_RET(CMD_RF_REG_ACCESS):
  84                 {
  85                         struct cmd_ds_rf_reg_access *reg = &resp->params.rfreg;
  86
  87                         priv->offsetvalue.offset = (u32)le16_to_cpu(reg->offset);
  88                         priv->offsetvalue.value = reg->value;
  89                         break;
  90                 }
  91
  92         default:
  93                 ret = -1;
  94         }
  95
  96         lbs_deb_leave_args(LBS_DEB_CMD, "ret %d", ret);
  97         return ret;
  98 }
  99 static inline int handle_cmd_response(struct lbs_private *priv,
 100                                       struct cmd_header *cmd_response)
 101 {
 102         struct cmd_ds_command *resp = (struct cmd_ds_command *) cmd_response;
 103         int ret = 0;
 104         unsigned long flags;
 105         uint16_t respcmd = le16_to_cpu(resp->command);
 106
 107         lbs_deb_enter(LBS_DEB_HOST);
 108
 109         switch (respcmd) {
 110         case CMD_RET(CMD_MAC_REG_ACCESS):
 111         case CMD_RET(CMD_BBP_REG_ACCESS):
 112         case CMD_RET(CMD_RF_REG_ACCESS):
 113                 ret = lbs_ret_reg_access(priv, respcmd, resp);
 114                 break;
 115
 116         case CMD_RET(CMD_802_11_SET_AFC):
 117         case CMD_RET(CMD_802_11_GET_AFC):
 118                 spin_lock_irqsave(&priv->driver_lock, flags);
 119                 memmove((void *)priv->cur_cmd->callback_arg, &resp->params.afc,
 120                         sizeof(struct cmd_ds_802_11_afc));
 121                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 122
 123                 break;
 124
 125         case CMD_RET(CMD_802_11_BEACON_STOP):
 126                 break;
 127
 128         case CMD_RET(CMD_802_11_TPC_CFG):
 129                 spin_lock_irqsave(&priv->driver_lock, flags);
 130                 memmove((void *)priv->cur_cmd->callback_arg, &resp->params.tpccfg,
 131                         sizeof(struct cmd_ds_802_11_tpc_cfg));
 132                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 133                 break;
 134
 135         case CMD_RET(CMD_BT_ACCESS):
 136                 spin_lock_irqsave(&priv->driver_lock, flags);
 137                 if (priv->cur_cmd->callback_arg)
 138                         memcpy((void *)priv->cur_cmd->callback_arg,
 139                                &resp->params.bt.addr1, 2 * ETH_ALEN);
 140                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 141                 break;
 142         case CMD_RET(CMD_FWT_ACCESS):
 143                 spin_lock_irqsave(&priv->driver_lock, flags);
 144                 if (priv->cur_cmd->callback_arg)
 145                         memcpy((void *)priv->cur_cmd->callback_arg, &resp->params.fwt,
 146                                sizeof(resp->params.fwt));
 147                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 148                 break;
 149         case CMD_RET(CMD_802_11_BEACON_CTRL):
 150                 ret = lbs_ret_802_11_bcn_ctrl(priv, resp);
 151                 break;
 152
 153         default:
 154                 lbs_pr_err("CMD_RESP: unknown cmd response 0x%04x\n",
 155                            le16_to_cpu(resp->command));
 156                 break;
 157         }
 158         lbs_deb_leave(LBS_DEB_HOST);
 159         return ret;
 160 }
 161
 162 int lbs_process_command_response(struct lbs_private *priv, u8 *data, u32 len)
 163 {
 164         uint16_t respcmd, curcmd;
 165         struct cmd_header *resp;
 166         int ret = 0;
 167         unsigned long flags;
 168         uint16_t result;
 169
 170         lbs_deb_enter(LBS_DEB_HOST);
 171
 172         mutex_lock(&priv->lock);
 173         spin_lock_irqsave(&priv->driver_lock, flags);
 174
 175         if (!priv->cur_cmd) {
 176                 lbs_deb_host("CMD_RESP: cur_cmd is NULL\n");
 177                 ret = -1;
 178                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 179                 goto done;
 180         }
 181
 182         resp = (void *)data;
 183         curcmd = le16_to_cpu(priv->cur_cmd->cmdbuf->command);
 184         respcmd = le16_to_cpu(resp->command);
 185         result = le16_to_cpu(resp->result);
 186
 187         lbs_deb_cmd("CMD_RESP: response 0x%04x, seq %d, size %d\n",
 188                      respcmd, le16_to_cpu(resp->seqnum), len);
 189         lbs_deb_hex(LBS_DEB_CMD, "CMD_RESP", (void *) resp, len);
 190
 191         if (resp->seqnum != priv->cur_cmd->cmdbuf->seqnum) {
 192                 lbs_pr_info("Received CMD_RESP with invalid sequence %d (expected %d)\n",
 193                             le16_to_cpu(resp->seqnum), le16_to_cpu(priv->cur_cmd->cmdbuf->seqnum));
 194                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 195                 ret = -1;
 196                 goto done;
 197         }
 198         if (respcmd != CMD_RET(curcmd) &&
 199             respcmd != CMD_RET_802_11_ASSOCIATE && curcmd != CMD_802_11_ASSOCIATE) {
 200                 lbs_pr_info("Invalid CMD_RESP %x to command %x!\n", respcmd, curcmd);
 201                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 202                 ret = -1;
 203                 goto done;
 204         }
 205
 206         if (resp->result == cpu_to_le16(0x0004)) {
 207                 /* 0x0004 means -EAGAIN. Drop the response, let it time out
 208                    and be resubmitted */
 209                 lbs_pr_info("Firmware returns DEFER to command %x. Will let it time out...\n",
 210                             le16_to_cpu(resp->command));
 211                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 212                 ret = -1;
 213                 goto done;
 214         }
 215
 216         /* Now we got response from FW, cancel the command timer */
 217         del_timer(&priv->command_timer);
 218         priv->cmd_timed_out = 0;
 219
 220         /* Store the response code to cur_cmd_retcode. */
 221         priv->cur_cmd_retcode = result;
 222
 223         if (respcmd == CMD_RET(CMD_802_11_PS_MODE)) {
 224                 struct cmd_ds_802_11_ps_mode *psmode = (void *) &resp[1];
 225                 u16 action = le16_to_cpu(psmode->action);
 226
 227                 lbs_deb_host(
 228                        "CMD_RESP: PS_MODE cmd reply result 0x%x, action 0x%x\n",
 229                        result, action);
 230
 231                 if (result) {
 232                         lbs_deb_host("CMD_RESP: PS command failed with 0x%x\n",
 233                                     result);
 234                         /*
 235                          * We should not re-try enter-ps command in
 236                          * ad-hoc mode. It takes place in
 237                          * lbs_execute_next_command().
 238                          */
 239                         if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR &&
 240                             action == CMD_SUBCMD_ENTER_PS)
 241                                 priv->psmode = LBS802_11POWERMODECAM;
 242                 } else if (action == CMD_SUBCMD_ENTER_PS) {
 243                         priv->needtowakeup = 0;
 244                         priv->psstate = PS_STATE_AWAKE;
 245
 246                         lbs_deb_host("CMD_RESP: ENTER_PS command response\n");
 247                         if (priv->connect_status != LBS_CONNECTED) {
 248                                 /*
 249                                  * When Deauth Event received before Enter_PS command
 250                                  * response, We need to wake up the firmware.
 251                                  */
 252                                 lbs_deb_host(
 253                                        "disconnected, invoking lbs_ps_wakeup\n");
 254
 255                                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 256                                 mutex_unlock(&priv->lock);
 257                                 lbs_ps_wakeup(priv, 0);
 258                                 mutex_lock(&priv->lock);
 259                                 spin_lock_irqsave(&priv->driver_lock, flags);
 260                         }
 261                 } else if (action == CMD_SUBCMD_EXIT_PS) {
 262                         priv->needtowakeup = 0;
 263                         priv->psstate = PS_STATE_FULL_POWER;
 264                         lbs_deb_host("CMD_RESP: EXIT_PS command response\n");
 265                 } else {
 266                         lbs_deb_host("CMD_RESP: PS action 0x%X\n", action);
 267                 }
 268
 269                 lbs_complete_command(priv, priv->cur_cmd, result);
 270                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 271
 272                 ret = 0;
 273                 goto done;
 274         }
 275
 276         /* If the command is not successful, cleanup and return failure */
 277         if ((result != 0 || !(respcmd & 0x8000))) {
 278                 lbs_deb_host("CMD_RESP: error 0x%04x in command reply 0x%04x\n",
 279                        result, respcmd);
 280                 /*
 281                  * Handling errors here
 282                  */
 283                 switch (respcmd) {
 284                 case CMD_RET(CMD_GET_HW_SPEC):
 285                 case CMD_RET(CMD_802_11_RESET):
 286                         lbs_deb_host("CMD_RESP: reset failed\n");
 287                         break;
 288
 289                 }
 290                 lbs_complete_command(priv, priv->cur_cmd, result);
 291                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 292
 293                 ret = -1;
 294                 goto done;
 295         }
 296
 297         spin_unlock_irqrestore(&priv->driver_lock, flags);
 298
 299         if (priv->cur_cmd && priv->cur_cmd->callback) {
 300                 ret = priv->cur_cmd->callback(priv, priv->cur_cmd->callback_arg,
 301                                 resp);
 302         } else
 303                 ret = handle_cmd_response(priv, resp);
 304
 305         spin_lock_irqsave(&priv->driver_lock, flags);
 306
 307         if (priv->cur_cmd) {
 308                 /* Clean up and Put current command back to cmdfreeq */
 309                 lbs_complete_command(priv, priv->cur_cmd, result);
 310         }
 311         spin_unlock_irqrestore(&priv->driver_lock, flags);
 312
 313 done:
 314         mutex_unlock(&priv->lock);
 315         lbs_deb_leave_args(LBS_DEB_HOST, "ret %d", ret);
 316         return ret;
 317 }
 318
 319 int lbs_process_event(struct lbs_private *priv, u32 event)
 320 {
 321         int ret = 0;
 322         struct cmd_header cmd;
 323
 324         lbs_deb_enter(LBS_DEB_CMD);
 325
 326         switch (event) {
 327         case MACREG_INT_CODE_LINK_SENSED:
 328                 lbs_deb_cmd("EVENT: link sensed\n");
 329                 break;
 330
 331         case MACREG_INT_CODE_DEAUTHENTICATED:
 332                 lbs_deb_cmd("EVENT: deauthenticated\n");
 333                 lbs_mac_event_disconnected(priv);
 334                 break;
 335
 336         case MACREG_INT_CODE_DISASSOCIATED:
 337                 lbs_deb_cmd("EVENT: disassociated\n");
 338                 lbs_mac_event_disconnected(priv);
 339                 break;
 340
 341         case MACREG_INT_CODE_LINK_LOST_NO_SCAN:
 342                 lbs_deb_cmd("EVENT: link lost\n");
 343                 lbs_mac_event_disconnected(priv);
 344                 break;
 345
 346         case MACREG_INT_CODE_PS_SLEEP:
 347                 lbs_deb_cmd("EVENT: ps sleep\n");
 348
 349                 /* handle unexpected PS SLEEP event */
 350                 if (priv->psstate == PS_STATE_FULL_POWER) {
 351                         lbs_deb_cmd(
 352                                "EVENT: in FULL POWER mode, ignoreing PS_SLEEP\n");
 353                         break;
 354                 }
 355                 priv->psstate = PS_STATE_PRE_SLEEP;
 356
 357                 lbs_ps_confirm_sleep(priv);
 358
 359                 break;
 360
 361         case MACREG_INT_CODE_HOST_AWAKE:
 362                 lbs_deb_cmd("EVENT: host awake\n");
 363                 if (priv->reset_deep_sleep_wakeup)
 364                         priv->reset_deep_sleep_wakeup(priv);
 365                 priv->is_deep_sleep = 0;
 366                 lbs_cmd_async(priv, CMD_802_11_WAKEUP_CONFIRM, &cmd,
 367                                 sizeof(cmd));
 368                 priv->is_host_sleep_activated = 0;
 369                 wake_up_interruptible(&priv->host_sleep_q);
 370                 break;
 371
 372         case MACREG_INT_CODE_DEEP_SLEEP_AWAKE:
 373                 if (priv->reset_deep_sleep_wakeup)
 374                         priv->reset_deep_sleep_wakeup(priv);
 375                 lbs_deb_cmd("EVENT: ds awake\n");
 376                 priv->is_deep_sleep = 0;
 377                 priv->wakeup_dev_required = 0;
 378                 wake_up_interruptible(&priv->ds_awake_q);
 379                 break;
 380
 381         case MACREG_INT_CODE_PS_AWAKE:
 382                 lbs_deb_cmd("EVENT: ps awake\n");
 383                 /* handle unexpected PS AWAKE event */
 384                 if (priv->psstate == PS_STATE_FULL_POWER) {
 385                         lbs_deb_cmd(
 386                                "EVENT: In FULL POWER mode - ignore PS AWAKE\n");
 387                         break;
 388                 }
 389
 390                 priv->psstate = PS_STATE_AWAKE;
 391
 392                 if (priv->needtowakeup) {
 393                         /*
 394                          * wait for the command processing to finish
 395                          * before resuming sending
 396                          * priv->needtowakeup will be set to FALSE
 397                          * in lbs_ps_wakeup()
 398                          */
 399                         lbs_deb_cmd("waking up ...\n");
 400                         lbs_ps_wakeup(priv, 0);
 401                 }
 402                 break;
 403
 404         case MACREG_INT_CODE_MIC_ERR_UNICAST:
 405                 lbs_deb_cmd("EVENT: UNICAST MIC ERROR\n");
 406                 lbs_send_mic_failureevent(priv, event);
 407                 break;
 408
 409         case MACREG_INT_CODE_MIC_ERR_MULTICAST:
 410                 lbs_deb_cmd("EVENT: MULTICAST MIC ERROR\n");
 411                 lbs_send_mic_failureevent(priv, event);
 412                 break;
 413
 414         case MACREG_INT_CODE_MIB_CHANGED:
 415                 lbs_deb_cmd("EVENT: MIB CHANGED\n");
 416                 break;
 417         case MACREG_INT_CODE_INIT_DONE:
 418                 lbs_deb_cmd("EVENT: INIT DONE\n");
 419                 break;
 420         case MACREG_INT_CODE_ADHOC_BCN_LOST:
 421                 lbs_deb_cmd("EVENT: ADHOC beacon lost\n");
 422                 break;
 423         case MACREG_INT_CODE_RSSI_LOW:
 424                 lbs_pr_alert("EVENT: rssi low\n");
 425                 break;
 426         case MACREG_INT_CODE_SNR_LOW:
 427                 lbs_pr_alert("EVENT: snr low\n");
 428                 break;
 429         case MACREG_INT_CODE_MAX_FAIL:
 430                 lbs_pr_alert("EVENT: max fail\n");
 431                 break;
 432         case MACREG_INT_CODE_RSSI_HIGH:
 433                 lbs_pr_alert("EVENT: rssi high\n");
 434                 break;
 435         case MACREG_INT_CODE_SNR_HIGH:
 436                 lbs_pr_alert("EVENT: snr high\n");
 437                 break;
 438
 439         case MACREG_INT_CODE_MESH_AUTO_STARTED:
 440                 /* Ignore spurious autostart events */
 441                 lbs_pr_info("EVENT: MESH_AUTO_STARTED (ignoring)\n");
 442                 break;
 443
 444         default:
 445                 lbs_pr_alert("EVENT: unknown event id %d\n", event);
 446                 break;
 447         }
 448
 449         lbs_deb_leave_args(LBS_DEB_CMD, "ret %d", ret);
 450         return ret;
 451 }