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_BEACON_STOP):
 117                 break;
 118
 119         case CMD_RET(CMD_BT_ACCESS):
 120                 spin_lock_irqsave(&priv->driver_lock, flags);
 121                 if (priv->cur_cmd->callback_arg)
 122                         memcpy((void *)priv->cur_cmd->callback_arg,
 123                                &resp->params.bt.addr1, 2 * ETH_ALEN);
 124                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 125                 break;
 126         case CMD_RET(CMD_FWT_ACCESS):
 127                 spin_lock_irqsave(&priv->driver_lock, flags);
 128                 if (priv->cur_cmd->callback_arg)
 129                         memcpy((void *)priv->cur_cmd->callback_arg, &resp->params.fwt,
 130                                sizeof(resp->params.fwt));
 131                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 132                 break;
 133         case CMD_RET(CMD_802_11_BEACON_CTRL):
 134                 ret = lbs_ret_802_11_bcn_ctrl(priv, resp);
 135                 break;
 136
 137         default:
 138                 lbs_pr_err("CMD_RESP: unknown cmd response 0x%04x\n",
 139                            le16_to_cpu(resp->command));
 140                 break;
 141         }
 142         lbs_deb_leave(LBS_DEB_HOST);
 143         return ret;
 144 }
 145
 146 int lbs_process_command_response(struct lbs_private *priv, u8 *data, u32 len)
 147 {
 148         uint16_t respcmd, curcmd;
 149         struct cmd_header *resp;
 150         int ret = 0;
 151         unsigned long flags;
 152         uint16_t result;
 153
 154         lbs_deb_enter(LBS_DEB_HOST);
 155
 156         mutex_lock(&priv->lock);
 157         spin_lock_irqsave(&priv->driver_lock, flags);
 158
 159         if (!priv->cur_cmd) {
 160                 lbs_deb_host("CMD_RESP: cur_cmd is NULL\n");
 161                 ret = -1;
 162                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 163                 goto done;
 164         }
 165
 166         resp = (void *)data;
 167         curcmd = le16_to_cpu(priv->cur_cmd->cmdbuf->command);
 168         respcmd = le16_to_cpu(resp->command);
 169         result = le16_to_cpu(resp->result);
 170
 171         lbs_deb_cmd("CMD_RESP: response 0x%04x, seq %d, size %d\n",
 172                      respcmd, le16_to_cpu(resp->seqnum), len);
 173         lbs_deb_hex(LBS_DEB_CMD, "CMD_RESP", (void *) resp, len);
 174
 175         if (resp->seqnum != priv->cur_cmd->cmdbuf->seqnum) {
 176                 lbs_pr_info("Received CMD_RESP with invalid sequence %d (expected %d)\n",
 177                             le16_to_cpu(resp->seqnum), le16_to_cpu(priv->cur_cmd->cmdbuf->seqnum));
 178                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 179                 ret = -1;
 180                 goto done;
 181         }
 182         if (respcmd != CMD_RET(curcmd) &&
 183             respcmd != CMD_RET_802_11_ASSOCIATE && curcmd != CMD_802_11_ASSOCIATE) {
 184                 lbs_pr_info("Invalid CMD_RESP %x to command %x!\n", respcmd, curcmd);
 185                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 186                 ret = -1;
 187                 goto done;
 188         }
 189
 190         if (resp->result == cpu_to_le16(0x0004)) {
 191                 /* 0x0004 means -EAGAIN. Drop the response, let it time out
 192                    and be resubmitted */
 193                 lbs_pr_info("Firmware returns DEFER to command %x. Will let it time out...\n",
 194                             le16_to_cpu(resp->command));
 195                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 196                 ret = -1;
 197                 goto done;
 198         }
 199
 200         /* Now we got response from FW, cancel the command timer */
 201         del_timer(&priv->command_timer);
 202         priv->cmd_timed_out = 0;
 203
 204         /* Store the response code to cur_cmd_retcode. */
 205         priv->cur_cmd_retcode = result;
 206
 207         if (respcmd == CMD_RET(CMD_802_11_PS_MODE)) {
 208                 struct cmd_ds_802_11_ps_mode *psmode = (void *) &resp[1];
 209                 u16 action = le16_to_cpu(psmode->action);
 210
 211                 lbs_deb_host(
 212                        "CMD_RESP: PS_MODE cmd reply result 0x%x, action 0x%x\n",
 213                        result, action);
 214
 215                 if (result) {
 216                         lbs_deb_host("CMD_RESP: PS command failed with 0x%x\n",
 217                                     result);
 218                         /*
 219                          * We should not re-try enter-ps command in
 220                          * ad-hoc mode. It takes place in
 221                          * lbs_execute_next_command().
 222                          */
 223                         if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR &&
 224                             action == CMD_SUBCMD_ENTER_PS)
 225                                 priv->psmode = LBS802_11POWERMODECAM;
 226                 } else if (action == CMD_SUBCMD_ENTER_PS) {
 227                         priv->needtowakeup = 0;
 228                         priv->psstate = PS_STATE_AWAKE;
 229
 230                         lbs_deb_host("CMD_RESP: ENTER_PS command response\n");
 231                         if (priv->connect_status != LBS_CONNECTED) {
 232                                 /*
 233                                  * When Deauth Event received before Enter_PS command
 234                                  * response, We need to wake up the firmware.
 235                                  */
 236                                 lbs_deb_host(
 237                                        "disconnected, invoking lbs_ps_wakeup\n");
 238
 239                                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 240                                 mutex_unlock(&priv->lock);
 241                                 lbs_ps_wakeup(priv, 0);
 242                                 mutex_lock(&priv->lock);
 243                                 spin_lock_irqsave(&priv->driver_lock, flags);
 244                         }
 245                 } else if (action == CMD_SUBCMD_EXIT_PS) {
 246                         priv->needtowakeup = 0;
 247                         priv->psstate = PS_STATE_FULL_POWER;
 248                         lbs_deb_host("CMD_RESP: EXIT_PS command response\n");
 249                 } else {
 250                         lbs_deb_host("CMD_RESP: PS action 0x%X\n", action);
 251                 }
 252
 253                 lbs_complete_command(priv, priv->cur_cmd, result);
 254                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 255
 256                 ret = 0;
 257                 goto done;
 258         }
 259
 260         /* If the command is not successful, cleanup and return failure */
 261         if ((result != 0 || !(respcmd & 0x8000))) {
 262                 lbs_deb_host("CMD_RESP: error 0x%04x in command reply 0x%04x\n",
 263                        result, respcmd);
 264                 /*
 265                  * Handling errors here
 266                  */
 267                 switch (respcmd) {
 268                 case CMD_RET(CMD_GET_HW_SPEC):
 269                 case CMD_RET(CMD_802_11_RESET):
 270                         lbs_deb_host("CMD_RESP: reset failed\n");
 271                         break;
 272
 273                 }
 274                 lbs_complete_command(priv, priv->cur_cmd, result);
 275                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 276
 277                 ret = -1;
 278                 goto done;
 279         }
 280
 281         spin_unlock_irqrestore(&priv->driver_lock, flags);
 282
 283         if (priv->cur_cmd && priv->cur_cmd->callback) {
 284                 ret = priv->cur_cmd->callback(priv, priv->cur_cmd->callback_arg,
 285                                 resp);
 286         } else
 287                 ret = handle_cmd_response(priv, resp);
 288
 289         spin_lock_irqsave(&priv->driver_lock, flags);
 290
 291         if (priv->cur_cmd) {
 292                 /* Clean up and Put current command back to cmdfreeq */
 293                 lbs_complete_command(priv, priv->cur_cmd, result);
 294         }
 295         spin_unlock_irqrestore(&priv->driver_lock, flags);
 296
 297 done:
 298         mutex_unlock(&priv->lock);
 299         lbs_deb_leave_args(LBS_DEB_HOST, "ret %d", ret);
 300         return ret;
 301 }
 302
 303 int lbs_process_event(struct lbs_private *priv, u32 event)
 304 {
 305         int ret = 0;
 306         struct cmd_header cmd;
 307
 308         lbs_deb_enter(LBS_DEB_CMD);
 309
 310         switch (event) {
 311         case MACREG_INT_CODE_LINK_SENSED:
 312                 lbs_deb_cmd("EVENT: link sensed\n");
 313                 break;
 314
 315         case MACREG_INT_CODE_DEAUTHENTICATED:
 316                 lbs_deb_cmd("EVENT: deauthenticated\n");
 317                 lbs_mac_event_disconnected(priv);
 318                 break;
 319
 320         case MACREG_INT_CODE_DISASSOCIATED:
 321                 lbs_deb_cmd("EVENT: disassociated\n");
 322                 lbs_mac_event_disconnected(priv);
 323                 break;
 324
 325         case MACREG_INT_CODE_LINK_LOST_NO_SCAN:
 326                 lbs_deb_cmd("EVENT: link lost\n");
 327                 lbs_mac_event_disconnected(priv);
 328                 break;
 329
 330         case MACREG_INT_CODE_PS_SLEEP:
 331                 lbs_deb_cmd("EVENT: ps sleep\n");
 332
 333                 /* handle unexpected PS SLEEP event */
 334                 if (priv->psstate == PS_STATE_FULL_POWER) {
 335                         lbs_deb_cmd(
 336                                "EVENT: in FULL POWER mode, ignoreing PS_SLEEP\n");
 337                         break;
 338                 }
 339                 priv->psstate = PS_STATE_PRE_SLEEP;
 340
 341                 lbs_ps_confirm_sleep(priv);
 342
 343                 break;
 344
 345         case MACREG_INT_CODE_HOST_AWAKE:
 346                 lbs_deb_cmd("EVENT: host awake\n");
 347                 if (priv->reset_deep_sleep_wakeup)
 348                         priv->reset_deep_sleep_wakeup(priv);
 349                 priv->is_deep_sleep = 0;
 350                 lbs_cmd_async(priv, CMD_802_11_WAKEUP_CONFIRM, &cmd,
 351                                 sizeof(cmd));
 352                 priv->is_host_sleep_activated = 0;
 353                 wake_up_interruptible(&priv->host_sleep_q);
 354                 break;
 355
 356         case MACREG_INT_CODE_DEEP_SLEEP_AWAKE:
 357                 if (priv->reset_deep_sleep_wakeup)
 358                         priv->reset_deep_sleep_wakeup(priv);
 359                 lbs_deb_cmd("EVENT: ds awake\n");
 360                 priv->is_deep_sleep = 0;
 361                 priv->wakeup_dev_required = 0;
 362                 wake_up_interruptible(&priv->ds_awake_q);
 363                 break;
 364
 365         case MACREG_INT_CODE_PS_AWAKE:
 366                 lbs_deb_cmd("EVENT: ps awake\n");
 367                 /* handle unexpected PS AWAKE event */
 368                 if (priv->psstate == PS_STATE_FULL_POWER) {
 369                         lbs_deb_cmd(
 370                                "EVENT: In FULL POWER mode - ignore PS AWAKE\n");
 371                         break;
 372                 }
 373
 374                 priv->psstate = PS_STATE_AWAKE;
 375
 376                 if (priv->needtowakeup) {
 377                         /*
 378                          * wait for the command processing to finish
 379                          * before resuming sending
 380                          * priv->needtowakeup will be set to FALSE
 381                          * in lbs_ps_wakeup()
 382                          */
 383                         lbs_deb_cmd("waking up ...\n");
 384                         lbs_ps_wakeup(priv, 0);
 385                 }
 386                 break;
 387
 388         case MACREG_INT_CODE_MIC_ERR_UNICAST:
 389                 lbs_deb_cmd("EVENT: UNICAST MIC ERROR\n");
 390                 lbs_send_mic_failureevent(priv, event);
 391                 break;
 392
 393         case MACREG_INT_CODE_MIC_ERR_MULTICAST:
 394                 lbs_deb_cmd("EVENT: MULTICAST MIC ERROR\n");
 395                 lbs_send_mic_failureevent(priv, event);
 396                 break;
 397
 398         case MACREG_INT_CODE_MIB_CHANGED:
 399                 lbs_deb_cmd("EVENT: MIB CHANGED\n");
 400                 break;
 401         case MACREG_INT_CODE_INIT_DONE:
 402                 lbs_deb_cmd("EVENT: INIT DONE\n");
 403                 break;
 404         case MACREG_INT_CODE_ADHOC_BCN_LOST:
 405                 lbs_deb_cmd("EVENT: ADHOC beacon lost\n");
 406                 break;
 407         case MACREG_INT_CODE_RSSI_LOW:
 408                 lbs_pr_alert("EVENT: rssi low\n");
 409                 break;
 410         case MACREG_INT_CODE_SNR_LOW:
 411                 lbs_pr_alert("EVENT: snr low\n");
 412                 break;
 413         case MACREG_INT_CODE_MAX_FAIL:
 414                 lbs_pr_alert("EVENT: max fail\n");
 415                 break;
 416         case MACREG_INT_CODE_RSSI_HIGH:
 417                 lbs_pr_alert("EVENT: rssi high\n");
 418                 break;
 419         case MACREG_INT_CODE_SNR_HIGH:
 420                 lbs_pr_alert("EVENT: snr high\n");
 421                 break;
 422
 423         case MACREG_INT_CODE_MESH_AUTO_STARTED:
 424                 /* Ignore spurious autostart events */
 425                 lbs_pr_info("EVENT: MESH_AUTO_STARTED (ignoring)\n");
 426                 break;
 427
 428         default:
 429                 lbs_pr_alert("EVENT: unknown event id %d\n", event);
 430                 break;
 431         }
 432
 433         lbs_deb_leave_args(LBS_DEB_CMD, "ret %d", ret);
 434         return ret;
 435 }