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_BT_ACCESS):
 129                 spin_lock_irqsave(&priv->driver_lock, flags);
 130                 if (priv->cur_cmd->callback_arg)
 131                         memcpy((void *)priv->cur_cmd->callback_arg,
 132                                &resp->params.bt.addr1, 2 * ETH_ALEN);
 133                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 134                 break;
 135         case CMD_RET(CMD_FWT_ACCESS):
 136                 spin_lock_irqsave(&priv->driver_lock, flags);
 137                 if (priv->cur_cmd->callback_arg)
 138                         memcpy((void *)priv->cur_cmd->callback_arg, &resp->params.fwt,
 139                                sizeof(resp->params.fwt));
 140                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 141                 break;
 142         case CMD_RET(CMD_802_11_BEACON_CTRL):
 143                 ret = lbs_ret_802_11_bcn_ctrl(priv, resp);
 144                 break;
 145
 146         default:
 147                 lbs_pr_err("CMD_RESP: unknown cmd response 0x%04x\n",
 148                            le16_to_cpu(resp->command));
 149                 break;
 150         }
 151         lbs_deb_leave(LBS_DEB_HOST);
 152         return ret;
 153 }
 154
 155 int lbs_process_command_response(struct lbs_private *priv, u8 *data, u32 len)
 156 {
 157         uint16_t respcmd, curcmd;
 158         struct cmd_header *resp;
 159         int ret = 0;
 160         unsigned long flags;
 161         uint16_t result;
 162
 163         lbs_deb_enter(LBS_DEB_HOST);
 164
 165         mutex_lock(&priv->lock);
 166         spin_lock_irqsave(&priv->driver_lock, flags);
 167
 168         if (!priv->cur_cmd) {
 169                 lbs_deb_host("CMD_RESP: cur_cmd is NULL\n");
 170                 ret = -1;
 171                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 172                 goto done;
 173         }
 174
 175         resp = (void *)data;
 176         curcmd = le16_to_cpu(priv->cur_cmd->cmdbuf->command);
 177         respcmd = le16_to_cpu(resp->command);
 178         result = le16_to_cpu(resp->result);
 179
 180         lbs_deb_cmd("CMD_RESP: response 0x%04x, seq %d, size %d\n",
 181                      respcmd, le16_to_cpu(resp->seqnum), len);
 182         lbs_deb_hex(LBS_DEB_CMD, "CMD_RESP", (void *) resp, len);
 183
 184         if (resp->seqnum != priv->cur_cmd->cmdbuf->seqnum) {
 185                 lbs_pr_info("Received CMD_RESP with invalid sequence %d (expected %d)\n",
 186                             le16_to_cpu(resp->seqnum), le16_to_cpu(priv->cur_cmd->cmdbuf->seqnum));
 187                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 188                 ret = -1;
 189                 goto done;
 190         }
 191         if (respcmd != CMD_RET(curcmd) &&
 192             respcmd != CMD_RET_802_11_ASSOCIATE && curcmd != CMD_802_11_ASSOCIATE) {
 193                 lbs_pr_info("Invalid CMD_RESP %x to command %x!\n", respcmd, curcmd);
 194                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 195                 ret = -1;
 196                 goto done;
 197         }
 198
 199         if (resp->result == cpu_to_le16(0x0004)) {
 200                 /* 0x0004 means -EAGAIN. Drop the response, let it time out
 201                    and be resubmitted */
 202                 lbs_pr_info("Firmware returns DEFER to command %x. Will let it time out...\n",
 203                             le16_to_cpu(resp->command));
 204                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 205                 ret = -1;
 206                 goto done;
 207         }
 208
 209         /* Now we got response from FW, cancel the command timer */
 210         del_timer(&priv->command_timer);
 211         priv->cmd_timed_out = 0;
 212
 213         /* Store the response code to cur_cmd_retcode. */
 214         priv->cur_cmd_retcode = result;
 215
 216         if (respcmd == CMD_RET(CMD_802_11_PS_MODE)) {
 217                 struct cmd_ds_802_11_ps_mode *psmode = (void *) &resp[1];
 218                 u16 action = le16_to_cpu(psmode->action);
 219
 220                 lbs_deb_host(
 221                        "CMD_RESP: PS_MODE cmd reply result 0x%x, action 0x%x\n",
 222                        result, action);
 223
 224                 if (result) {
 225                         lbs_deb_host("CMD_RESP: PS command failed with 0x%x\n",
 226                                     result);
 227                         /*
 228                          * We should not re-try enter-ps command in
 229                          * ad-hoc mode. It takes place in
 230                          * lbs_execute_next_command().
 231                          */
 232                         if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR &&
 233                             action == CMD_SUBCMD_ENTER_PS)
 234                                 priv->psmode = LBS802_11POWERMODECAM;
 235                 } else if (action == CMD_SUBCMD_ENTER_PS) {
 236                         priv->needtowakeup = 0;
 237                         priv->psstate = PS_STATE_AWAKE;
 238
 239                         lbs_deb_host("CMD_RESP: ENTER_PS command response\n");
 240                         if (priv->connect_status != LBS_CONNECTED) {
 241                                 /*
 242                                  * When Deauth Event received before Enter_PS command
 243                                  * response, We need to wake up the firmware.
 244                                  */
 245                                 lbs_deb_host(
 246                                        "disconnected, invoking lbs_ps_wakeup\n");
 247
 248                                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 249                                 mutex_unlock(&priv->lock);
 250                                 lbs_ps_wakeup(priv, 0);
 251                                 mutex_lock(&priv->lock);
 252                                 spin_lock_irqsave(&priv->driver_lock, flags);
 253                         }
 254                 } else if (action == CMD_SUBCMD_EXIT_PS) {
 255                         priv->needtowakeup = 0;
 256                         priv->psstate = PS_STATE_FULL_POWER;
 257                         lbs_deb_host("CMD_RESP: EXIT_PS command response\n");
 258                 } else {
 259                         lbs_deb_host("CMD_RESP: PS action 0x%X\n", action);
 260                 }
 261
 262                 lbs_complete_command(priv, priv->cur_cmd, result);
 263                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 264
 265                 ret = 0;
 266                 goto done;
 267         }
 268
 269         /* If the command is not successful, cleanup and return failure */
 270         if ((result != 0 || !(respcmd & 0x8000))) {
 271                 lbs_deb_host("CMD_RESP: error 0x%04x in command reply 0x%04x\n",
 272                        result, respcmd);
 273                 /*
 274                  * Handling errors here
 275                  */
 276                 switch (respcmd) {
 277                 case CMD_RET(CMD_GET_HW_SPEC):
 278                 case CMD_RET(CMD_802_11_RESET):
 279                         lbs_deb_host("CMD_RESP: reset failed\n");
 280                         break;
 281
 282                 }
 283                 lbs_complete_command(priv, priv->cur_cmd, result);
 284                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 285
 286                 ret = -1;
 287                 goto done;
 288         }
 289
 290         spin_unlock_irqrestore(&priv->driver_lock, flags);
 291
 292         if (priv->cur_cmd && priv->cur_cmd->callback) {
 293                 ret = priv->cur_cmd->callback(priv, priv->cur_cmd->callback_arg,
 294                                 resp);
 295         } else
 296                 ret = handle_cmd_response(priv, resp);
 297
 298         spin_lock_irqsave(&priv->driver_lock, flags);
 299
 300         if (priv->cur_cmd) {
 301                 /* Clean up and Put current command back to cmdfreeq */
 302                 lbs_complete_command(priv, priv->cur_cmd, result);
 303         }
 304         spin_unlock_irqrestore(&priv->driver_lock, flags);
 305
 306 done:
 307         mutex_unlock(&priv->lock);
 308         lbs_deb_leave_args(LBS_DEB_HOST, "ret %d", ret);
 309         return ret;
 310 }
 311
 312 int lbs_process_event(struct lbs_private *priv, u32 event)
 313 {
 314         int ret = 0;
 315         struct cmd_header cmd;
 316
 317         lbs_deb_enter(LBS_DEB_CMD);
 318
 319         switch (event) {
 320         case MACREG_INT_CODE_LINK_SENSED:
 321                 lbs_deb_cmd("EVENT: link sensed\n");
 322                 break;
 323
 324         case MACREG_INT_CODE_DEAUTHENTICATED:
 325                 lbs_deb_cmd("EVENT: deauthenticated\n");
 326                 lbs_mac_event_disconnected(priv);
 327                 break;
 328
 329         case MACREG_INT_CODE_DISASSOCIATED:
 330                 lbs_deb_cmd("EVENT: disassociated\n");
 331                 lbs_mac_event_disconnected(priv);
 332                 break;
 333
 334         case MACREG_INT_CODE_LINK_LOST_NO_SCAN:
 335                 lbs_deb_cmd("EVENT: link lost\n");
 336                 lbs_mac_event_disconnected(priv);
 337                 break;
 338
 339         case MACREG_INT_CODE_PS_SLEEP:
 340                 lbs_deb_cmd("EVENT: ps sleep\n");
 341
 342                 /* handle unexpected PS SLEEP event */
 343                 if (priv->psstate == PS_STATE_FULL_POWER) {
 344                         lbs_deb_cmd(
 345                                "EVENT: in FULL POWER mode, ignoreing PS_SLEEP\n");
 346                         break;
 347                 }
 348                 priv->psstate = PS_STATE_PRE_SLEEP;
 349
 350                 lbs_ps_confirm_sleep(priv);
 351
 352                 break;
 353
 354         case MACREG_INT_CODE_HOST_AWAKE:
 355                 lbs_deb_cmd("EVENT: host awake\n");
 356                 if (priv->reset_deep_sleep_wakeup)
 357                         priv->reset_deep_sleep_wakeup(priv);
 358                 priv->is_deep_sleep = 0;
 359                 lbs_cmd_async(priv, CMD_802_11_WAKEUP_CONFIRM, &cmd,
 360                                 sizeof(cmd));
 361                 priv->is_host_sleep_activated = 0;
 362                 wake_up_interruptible(&priv->host_sleep_q);
 363                 break;
 364
 365         case MACREG_INT_CODE_DEEP_SLEEP_AWAKE:
 366                 if (priv->reset_deep_sleep_wakeup)
 367                         priv->reset_deep_sleep_wakeup(priv);
 368                 lbs_deb_cmd("EVENT: ds awake\n");
 369                 priv->is_deep_sleep = 0;
 370                 priv->wakeup_dev_required = 0;
 371                 wake_up_interruptible(&priv->ds_awake_q);
 372                 break;
 373
 374         case MACREG_INT_CODE_PS_AWAKE:
 375                 lbs_deb_cmd("EVENT: ps awake\n");
 376                 /* handle unexpected PS AWAKE event */
 377                 if (priv->psstate == PS_STATE_FULL_POWER) {
 378                         lbs_deb_cmd(
 379                                "EVENT: In FULL POWER mode - ignore PS AWAKE\n");
 380                         break;
 381                 }
 382
 383                 priv->psstate = PS_STATE_AWAKE;
 384
 385                 if (priv->needtowakeup) {
 386                         /*
 387                          * wait for the command processing to finish
 388                          * before resuming sending
 389                          * priv->needtowakeup will be set to FALSE
 390                          * in lbs_ps_wakeup()
 391                          */
 392                         lbs_deb_cmd("waking up ...\n");
 393                         lbs_ps_wakeup(priv, 0);
 394                 }
 395                 break;
 396
 397         case MACREG_INT_CODE_MIC_ERR_UNICAST:
 398                 lbs_deb_cmd("EVENT: UNICAST MIC ERROR\n");
 399                 lbs_send_mic_failureevent(priv, event);
 400                 break;
 401
 402         case MACREG_INT_CODE_MIC_ERR_MULTICAST:
 403                 lbs_deb_cmd("EVENT: MULTICAST MIC ERROR\n");
 404                 lbs_send_mic_failureevent(priv, event);
 405                 break;
 406
 407         case MACREG_INT_CODE_MIB_CHANGED:
 408                 lbs_deb_cmd("EVENT: MIB CHANGED\n");
 409                 break;
 410         case MACREG_INT_CODE_INIT_DONE:
 411                 lbs_deb_cmd("EVENT: INIT DONE\n");
 412                 break;
 413         case MACREG_INT_CODE_ADHOC_BCN_LOST:
 414                 lbs_deb_cmd("EVENT: ADHOC beacon lost\n");
 415                 break;
 416         case MACREG_INT_CODE_RSSI_LOW:
 417                 lbs_pr_alert("EVENT: rssi low\n");
 418                 break;
 419         case MACREG_INT_CODE_SNR_LOW:
 420                 lbs_pr_alert("EVENT: snr low\n");
 421                 break;
 422         case MACREG_INT_CODE_MAX_FAIL:
 423                 lbs_pr_alert("EVENT: max fail\n");
 424                 break;
 425         case MACREG_INT_CODE_RSSI_HIGH:
 426                 lbs_pr_alert("EVENT: rssi high\n");
 427                 break;
 428         case MACREG_INT_CODE_SNR_HIGH:
 429                 lbs_pr_alert("EVENT: snr high\n");
 430                 break;
 431
 432         case MACREG_INT_CODE_MESH_AUTO_STARTED:
 433                 /* Ignore spurious autostart events */
 434                 lbs_pr_info("EVENT: MESH_AUTO_STARTED (ignoring)\n");
 435                 break;
 436
 437         default:
 438                 lbs_pr_alert("EVENT: unknown event id %d\n", event);
 439                 break;
 440         }
 441
 442         lbs_deb_leave_args(LBS_DEB_CMD, "ret %d", ret);
 443         return ret;
 444 }