drivers/net/wireless/libertas_tf/cmd.c

   1 /*
   2  *  Copyright (C) 2008, cozybit Inc.
   3  *  Copyright (C) 2003-2006, Marvell International Ltd.
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or (at
   8  *  your option) any later version.
   9  */
  10 #include "libertas_tf.h"
  11
  12 static const struct channel_range channel_ranges[] = {
  13         { LBTF_REGDOMAIN_US,            1, 12 },
  14         { LBTF_REGDOMAIN_CA,            1, 12 },
  15         { LBTF_REGDOMAIN_EU,            1, 14 },
  16         { LBTF_REGDOMAIN_JP,            1, 14 },
  17         { LBTF_REGDOMAIN_SP,            1, 14 },
  18         { LBTF_REGDOMAIN_FR,            1, 14 },
  19 };
  20
  21 static u16 lbtf_region_code_to_index[MRVDRV_MAX_REGION_CODE] =
  22 {
  23         LBTF_REGDOMAIN_US, LBTF_REGDOMAIN_CA, LBTF_REGDOMAIN_EU,
  24         LBTF_REGDOMAIN_SP, LBTF_REGDOMAIN_FR, LBTF_REGDOMAIN_JP,
  25 };
  26
  27 static struct cmd_ctrl_node *lbtf_get_cmd_ctrl_node(struct lbtf_private *priv);
  28
  29
  30 /**
  31  *  lbtf_cmd_copyback - Simple callback that copies response back into command
  32  *
  33  *  @priv       A pointer to struct lbtf_private structure
  34  *  @extra      A pointer to the original command structure for which
  35  *              'resp' is a response
  36  *  @resp       A pointer to the command response
  37  *
  38  *  Returns: 0 on success, error on failure
  39  */
  40 int lbtf_cmd_copyback(struct lbtf_private *priv, unsigned long extra,
  41                      struct cmd_header *resp)
  42 {
  43         struct cmd_header *buf = (void *)extra;
  44         uint16_t copy_len;
  45
  46         copy_len = min(le16_to_cpu(buf->size), le16_to_cpu(resp->size));
  47         memcpy(buf, resp, copy_len);
  48         return 0;
  49 }
  50 EXPORT_SYMBOL_GPL(lbtf_cmd_copyback);
  51
  52 #define CHAN_TO_IDX(chan) ((chan) - 1)
  53
  54 static void lbtf_geo_init(struct lbtf_private *priv)
  55 {
  56         const struct channel_range *range = channel_ranges;
  57         u8 ch;
  58         int i;
  59
  60         for (i = 0; i < ARRAY_SIZE(channel_ranges); i++)
  61                 if (channel_ranges[i].regdomain == priv->regioncode) {
  62                         range = &channel_ranges[i];
  63                         break;
  64                 }
  65
  66         for (ch = priv->range.start; ch < priv->range.end; ch++)
  67                 priv->channels[CHAN_TO_IDX(ch)].flags = 0;
  68 }
  69
  70 /**
  71  *  lbtf_update_hw_spec: Updates the hardware details.
  72  *
  73  *  @priv       A pointer to struct lbtf_private structure
  74  *
  75  *  Returns: 0 on success, error on failure
  76  */
  77 int lbtf_update_hw_spec(struct lbtf_private *priv)
  78 {
  79         struct cmd_ds_get_hw_spec cmd;
  80         int ret = -1;
  81         u32 i;
  82         DECLARE_MAC_BUF(mac);
  83
  84         memset(&cmd, 0, sizeof(cmd));
  85         cmd.hdr.size = cpu_to_le16(sizeof(cmd));
  86         memcpy(cmd.permanentaddr, priv->current_addr, ETH_ALEN);
  87         ret = lbtf_cmd_with_response(priv, CMD_GET_HW_SPEC, &cmd);
  88         if (ret)
  89                 goto out;
  90
  91         priv->fwcapinfo = le32_to_cpu(cmd.fwcapinfo);
  92
  93         /* The firmware release is in an interesting format: the patch
  94          * level is in the most significant nibble ... so fix that: */
  95         priv->fwrelease = le32_to_cpu(cmd.fwrelease);
  96         priv->fwrelease = (priv->fwrelease << 8) |
  97                 (priv->fwrelease >> 24 & 0xff);
  98
  99         printk(KERN_INFO "libertastf: %s, fw %u.%u.%up%u, cap 0x%08x\n",
 100                 print_mac(mac, cmd.permanentaddr),
 101                 priv->fwrelease >> 24 & 0xff,
 102                 priv->fwrelease >> 16 & 0xff,
 103                 priv->fwrelease >>  8 & 0xff,
 104                 priv->fwrelease       & 0xff,
 105                 priv->fwcapinfo);
 106
 107         /* Clamp region code to 8-bit since FW spec indicates that it should
 108          * only ever be 8-bit, even though the field size is 16-bit.  Some
 109          * firmware returns non-zero high 8 bits here.
 110          */
 111         priv->regioncode = le16_to_cpu(cmd.regioncode) & 0xFF;
 112
 113         for (i = 0; i < MRVDRV_MAX_REGION_CODE; i++) {
 114                 /* use the region code to search for the index */
 115                 if (priv->regioncode == lbtf_region_code_to_index[i])
 116                         break;
 117         }
 118
 119         /* if it's unidentified region code, use the default (USA) */
 120         if (i >= MRVDRV_MAX_REGION_CODE)
 121                 priv->regioncode = 0x10;
 122
 123         if (priv->current_addr[0] == 0xff)
 124                 memmove(priv->current_addr, cmd.permanentaddr, ETH_ALEN);
 125
 126         SET_IEEE80211_PERM_ADDR(priv->hw, priv->current_addr);
 127
 128         lbtf_geo_init(priv);
 129 out:
 130         return ret;
 131 }
 132
 133 /**
 134  *  lbtf_set_channel: Set the radio channel
 135  *
 136  *  @priv       A pointer to struct lbtf_private structure
 137  *  @channel    The desired channel, or 0 to clear a locked channel
 138  *
 139  *  Returns: 0 on success, error on failure
 140  */
 141 int lbtf_set_channel(struct lbtf_private *priv, u8 channel)
 142 {
 143         struct cmd_ds_802_11_rf_channel cmd;
 144
 145         cmd.hdr.size = cpu_to_le16(sizeof(cmd));
 146         cmd.action = cpu_to_le16(CMD_OPT_802_11_RF_CHANNEL_SET);
 147         cmd.channel = cpu_to_le16(channel);
 148
 149         return lbtf_cmd_with_response(priv, CMD_802_11_RF_CHANNEL, &cmd);
 150 }
 151
 152 int lbtf_beacon_set(struct lbtf_private *priv, struct sk_buff *beacon)
 153 {
 154         struct cmd_ds_802_11_beacon_set cmd;
 155         int size;
 156
 157         if (beacon->len > MRVL_MAX_BCN_SIZE)
 158                 return -1;
 159         size =  sizeof(cmd) - sizeof(cmd.beacon) + beacon->len;
 160         cmd.hdr.size = cpu_to_le16(size);
 161         cmd.len = cpu_to_le16(beacon->len);
 162         memcpy(cmd.beacon, (u8 *) beacon->data, beacon->len);
 163
 164         lbtf_cmd_async(priv, CMD_802_11_BEACON_SET, &cmd.hdr, size);
 165         return 0;
 166 }
 167
 168 int lbtf_beacon_ctrl(struct lbtf_private *priv, bool beacon_enable,
 169                      int beacon_int) {
 170         struct cmd_ds_802_11_beacon_control cmd;
 171
 172         cmd.hdr.size = cpu_to_le16(sizeof(cmd));
 173         cmd.action = cpu_to_le16(CMD_ACT_SET);
 174         cmd.beacon_enable = cpu_to_le16(beacon_enable);
 175         cmd.beacon_period = cpu_to_le16(beacon_int);
 176
 177         lbtf_cmd_async(priv, CMD_802_11_BEACON_CTRL, &cmd.hdr, sizeof(cmd));
 178         return 0;
 179 }
 180
 181 static void lbtf_queue_cmd(struct lbtf_private *priv,
 182                           struct cmd_ctrl_node *cmdnode)
 183 {
 184         unsigned long flags;
 185
 186         if (!cmdnode)
 187                 return;
 188
 189         if (!cmdnode->cmdbuf->size)
 190                 return;
 191
 192         cmdnode->result = 0;
 193         spin_lock_irqsave(&priv->driver_lock, flags);
 194         list_add_tail(&cmdnode->list, &priv->cmdpendingq);
 195         spin_unlock_irqrestore(&priv->driver_lock, flags);
 196 }
 197
 198 static void lbtf_submit_command(struct lbtf_private *priv,
 199                                struct cmd_ctrl_node *cmdnode)
 200 {
 201         unsigned long flags;
 202         struct cmd_header *cmd;
 203         uint16_t cmdsize;
 204         uint16_t command;
 205         int timeo = 5 * HZ;
 206         int ret;
 207
 208         cmd = cmdnode->cmdbuf;
 209
 210         spin_lock_irqsave(&priv->driver_lock, flags);
 211         priv->cur_cmd = cmdnode;
 212         cmdsize = le16_to_cpu(cmd->size);
 213         command = le16_to_cpu(cmd->command);
 214         ret = priv->hw_host_to_card(priv, MVMS_CMD, (u8 *) cmd, cmdsize);
 215         spin_unlock_irqrestore(&priv->driver_lock, flags);
 216
 217         if (ret)
 218                 /* Let the timer kick in and retry, and potentially reset
 219                    the whole thing if the condition persists */
 220                 timeo = HZ;
 221
 222         /* Setup the timer after transmit command */
 223         mod_timer(&priv->command_timer, jiffies + timeo);
 224 }
 225
 226 /**
 227  *  This function inserts command node to cmdfreeq
 228  *  after cleans it. Requires priv->driver_lock held.
 229  */
 230 static void __lbtf_cleanup_and_insert_cmd(struct lbtf_private *priv,
 231                                          struct cmd_ctrl_node *cmdnode)
 232 {
 233         if (!cmdnode)
 234                 return;
 235
 236         cmdnode->callback = NULL;
 237         cmdnode->callback_arg = 0;
 238
 239         memset(cmdnode->cmdbuf, 0, LBS_CMD_BUFFER_SIZE);
 240
 241         list_add_tail(&cmdnode->list, &priv->cmdfreeq);
 242 }
 243
 244 static void lbtf_cleanup_and_insert_cmd(struct lbtf_private *priv,
 245         struct cmd_ctrl_node *ptempcmd)
 246 {
 247         unsigned long flags;
 248
 249         spin_lock_irqsave(&priv->driver_lock, flags);
 250         __lbtf_cleanup_and_insert_cmd(priv, ptempcmd);
 251         spin_unlock_irqrestore(&priv->driver_lock, flags);
 252 }
 253
 254 void lbtf_complete_command(struct lbtf_private *priv, struct cmd_ctrl_node *cmd,
 255                           int result)
 256 {
 257         cmd->result = result;
 258         cmd->cmdwaitqwoken = 1;
 259         wake_up_interruptible(&cmd->cmdwait_q);
 260
 261         if (!cmd->callback)
 262                 __lbtf_cleanup_and_insert_cmd(priv, cmd);
 263         priv->cur_cmd = NULL;
 264 }
 265
 266 int lbtf_cmd_set_mac_multicast_addr(struct lbtf_private *priv)
 267 {
 268         struct cmd_ds_mac_multicast_addr cmd;
 269
 270         cmd.hdr.size = cpu_to_le16(sizeof(cmd));
 271         cmd.action = cpu_to_le16(CMD_ACT_SET);
 272
 273         cmd.nr_of_adrs = cpu_to_le16((u16) priv->nr_of_multicastmacaddr);
 274         memcpy(cmd.maclist, priv->multicastlist,
 275                priv->nr_of_multicastmacaddr * ETH_ALEN);
 276
 277         lbtf_cmd_async(priv, CMD_MAC_MULTICAST_ADR, &cmd.hdr, sizeof(cmd));
 278         return 0;
 279 }
 280
 281 void lbtf_set_mode(struct lbtf_private *priv, enum lbtf_mode mode)
 282 {
 283         struct cmd_ds_set_mode cmd;
 284
 285         cmd.hdr.size = cpu_to_le16(sizeof(cmd));
 286         cmd.mode = cpu_to_le16(mode);
 287         lbtf_cmd_async(priv, CMD_802_11_SET_MODE, &cmd.hdr, sizeof(cmd));
 288 }
 289
 290 void lbtf_set_bssid(struct lbtf_private *priv, bool activate, u8 *bssid)
 291 {
 292         struct cmd_ds_set_bssid cmd;
 293
 294         cmd.hdr.size = cpu_to_le16(sizeof(cmd));
 295         cmd.activate = activate ? 1 : 0;
 296         if (activate)
 297                 memcpy(cmd.bssid, bssid, ETH_ALEN);
 298
 299         lbtf_cmd_async(priv, CMD_802_11_SET_BSSID, &cmd.hdr, sizeof(cmd));
 300 }
 301
 302 int lbtf_set_mac_address(struct lbtf_private *priv, uint8_t *mac_addr)
 303 {
 304         struct cmd_ds_802_11_mac_address cmd;
 305
 306         cmd.hdr.size = cpu_to_le16(sizeof(cmd));
 307         cmd.action = cpu_to_le16(CMD_ACT_SET);
 308
 309         memcpy(cmd.macadd, mac_addr, ETH_ALEN);
 310
 311         lbtf_cmd_async(priv, CMD_802_11_MAC_ADDRESS, &cmd.hdr, sizeof(cmd));
 312         return 0;
 313 }
 314
 315 int lbtf_set_radio_control(struct lbtf_private *priv)
 316 {
 317         int ret = 0;
 318         struct cmd_ds_802_11_radio_control cmd;
 319
 320         cmd.hdr.size = cpu_to_le16(sizeof(cmd));
 321         cmd.action = cpu_to_le16(CMD_ACT_SET);
 322
 323         switch (priv->preamble) {
 324         case CMD_TYPE_SHORT_PREAMBLE:
 325                 cmd.control = cpu_to_le16(SET_SHORT_PREAMBLE);
 326                 break;
 327
 328         case CMD_TYPE_LONG_PREAMBLE:
 329                 cmd.control = cpu_to_le16(SET_LONG_PREAMBLE);
 330                 break;
 331
 332         case CMD_TYPE_AUTO_PREAMBLE:
 333         default:
 334                 cmd.control = cpu_to_le16(SET_AUTO_PREAMBLE);
 335                 break;
 336         }
 337
 338         if (priv->radioon)
 339                 cmd.control |= cpu_to_le16(TURN_ON_RF);
 340         else
 341                 cmd.control &= cpu_to_le16(~TURN_ON_RF);
 342
 343         ret = lbtf_cmd_with_response(priv, CMD_802_11_RADIO_CONTROL, &cmd);
 344         return ret;
 345 }
 346
 347 void lbtf_set_mac_control(struct lbtf_private *priv)
 348 {
 349         struct cmd_ds_mac_control cmd;
 350         cmd.hdr.size = cpu_to_le16(sizeof(cmd));
 351         cmd.action = cpu_to_le16(priv->mac_control);
 352         cmd.reserved = 0;
 353
 354         lbtf_cmd_async(priv, CMD_MAC_CONTROL,
 355                 &cmd.hdr, sizeof(cmd));
 356 }
 357
 358 /**
 359  *  lbtf_allocate_cmd_buffer - Allocates cmd buffer, links it to free cmd queue
 360  *
 361  *  @priv       A pointer to struct lbtf_private structure
 362  *
 363  *  Returns: 0 on success.
 364  */
 365 int lbtf_allocate_cmd_buffer(struct lbtf_private *priv)
 366 {
 367         u32 bufsize;
 368         u32 i;
 369         struct cmd_ctrl_node *cmdarray;
 370
 371         /* Allocate and initialize the command array */
 372         bufsize = sizeof(struct cmd_ctrl_node) * LBS_NUM_CMD_BUFFERS;
 373         cmdarray = kzalloc(bufsize, GFP_KERNEL);
 374         if (!cmdarray)
 375                 return -1;
 376         priv->cmd_array = cmdarray;
 377
 378         /* Allocate and initialize each command buffer in the command array */
 379         for (i = 0; i < LBS_NUM_CMD_BUFFERS; i++) {
 380                 cmdarray[i].cmdbuf = kzalloc(LBS_CMD_BUFFER_SIZE, GFP_KERNEL);
 381                 if (!cmdarray[i].cmdbuf)
 382                         return -1;
 383         }
 384
 385         for (i = 0; i < LBS_NUM_CMD_BUFFERS; i++) {
 386                 init_waitqueue_head(&cmdarray[i].cmdwait_q);
 387                 lbtf_cleanup_and_insert_cmd(priv, &cmdarray[i]);
 388         }
 389         return 0;
 390 }
 391
 392 /**
 393  *  lbtf_free_cmd_buffer - Frees the cmd buffer.
 394  *
 395  *  @priv       A pointer to struct lbtf_private structure
 396  *
 397  *  Returns: 0
 398  */
 399 int lbtf_free_cmd_buffer(struct lbtf_private *priv)
 400 {
 401         struct cmd_ctrl_node *cmdarray;
 402         unsigned int i;
 403
 404         /* need to check if cmd array is allocated or not */
 405         if (priv->cmd_array == NULL)
 406                 return 0;
 407
 408         cmdarray = priv->cmd_array;
 409
 410         /* Release shared memory buffers */
 411         for (i = 0; i < LBS_NUM_CMD_BUFFERS; i++) {
 412                 kfree(cmdarray[i].cmdbuf);
 413                 cmdarray[i].cmdbuf = NULL;
 414         }
 415
 416         /* Release cmd_ctrl_node */
 417         kfree(priv->cmd_array);
 418         priv->cmd_array = NULL;
 419
 420         return 0;
 421 }
 422
 423 /**
 424  *  lbtf_get_cmd_ctrl_node - Gets free cmd node from free cmd queue.
 425  *
 426  *  @priv               A pointer to struct lbtf_private structure
 427  *
 428  *  Returns: pointer to a struct cmd_ctrl_node or NULL if none available.
 429  */
 430 static struct cmd_ctrl_node *lbtf_get_cmd_ctrl_node(struct lbtf_private *priv)
 431 {
 432         struct cmd_ctrl_node *tempnode;
 433         unsigned long flags;
 434
 435         if (!priv)
 436                 return NULL;
 437
 438         spin_lock_irqsave(&priv->driver_lock, flags);
 439
 440         if (!list_empty(&priv->cmdfreeq)) {
 441                 tempnode = list_first_entry(&priv->cmdfreeq,
 442                                             struct cmd_ctrl_node, list);
 443                 list_del(&tempnode->list);
 444         } else
 445                 tempnode = NULL;
 446
 447         spin_unlock_irqrestore(&priv->driver_lock, flags);
 448
 449         return tempnode;
 450 }
 451
 452 /**
 453  *  lbtf_execute_next_command: execute next command in cmd pending queue.
 454  *
 455  *  @priv     A pointer to struct lbtf_private structure
 456  *
 457  *  Returns: 0 on success.
 458  */
 459 int lbtf_execute_next_command(struct lbtf_private *priv)
 460 {
 461         struct cmd_ctrl_node *cmdnode = NULL;
 462         struct cmd_header *cmd;
 463         unsigned long flags;
 464
 465         /* Debug group is LBS_DEB_THREAD and not LBS_DEB_HOST, because the
 466          * only caller to us is lbtf_thread() and we get even when a
 467          * data packet is received */
 468
 469         spin_lock_irqsave(&priv->driver_lock, flags);
 470
 471         if (priv->cur_cmd) {
 472                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 473                 return -1;
 474         }
 475
 476         if (!list_empty(&priv->cmdpendingq)) {
 477                 cmdnode = list_first_entry(&priv->cmdpendingq,
 478                                            struct cmd_ctrl_node, list);
 479         }
 480
 481         if (cmdnode) {
 482                 cmd = cmdnode->cmdbuf;
 483
 484                 list_del(&cmdnode->list);
 485                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 486                 lbtf_submit_command(priv, cmdnode);
 487         } else
 488                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 489         return 0;
 490 }
 491
 492 static struct cmd_ctrl_node *__lbtf_cmd_async(struct lbtf_private *priv,
 493         uint16_t command, struct cmd_header *in_cmd, int in_cmd_size,
 494         int (*callback)(struct lbtf_private *, unsigned long,
 495                         struct cmd_header *),
 496         unsigned long callback_arg)
 497 {
 498         struct cmd_ctrl_node *cmdnode;
 499
 500         if (priv->surpriseremoved)
 501                 return ERR_PTR(-ENOENT);
 502
 503         cmdnode = lbtf_get_cmd_ctrl_node(priv);
 504         if (cmdnode == NULL) {
 505                 /* Wake up main thread to execute next command */
 506                 queue_work(lbtf_wq, &priv->cmd_work);
 507                 return ERR_PTR(-ENOBUFS);
 508         }
 509
 510         cmdnode->callback = callback;
 511         cmdnode->callback_arg = callback_arg;
 512
 513         /* Copy the incoming command to the buffer */
 514         memcpy(cmdnode->cmdbuf, in_cmd, in_cmd_size);
 515
 516         /* Set sequence number, clean result, move to buffer */
 517         priv->seqnum++;
 518         cmdnode->cmdbuf->command = cpu_to_le16(command);
 519         cmdnode->cmdbuf->size    = cpu_to_le16(in_cmd_size);
 520         cmdnode->cmdbuf->seqnum  = cpu_to_le16(priv->seqnum);
 521         cmdnode->cmdbuf->result  = 0;
 522         cmdnode->cmdwaitqwoken = 0;
 523         lbtf_queue_cmd(priv, cmdnode);
 524         queue_work(lbtf_wq, &priv->cmd_work);
 525
 526         return cmdnode;
 527 }
 528
 529 void lbtf_cmd_async(struct lbtf_private *priv, uint16_t command,
 530         struct cmd_header *in_cmd, int in_cmd_size)
 531 {
 532         __lbtf_cmd_async(priv, command, in_cmd, in_cmd_size, NULL, 0);
 533 }
 534
 535 int __lbtf_cmd(struct lbtf_private *priv, uint16_t command,
 536               struct cmd_header *in_cmd, int in_cmd_size,
 537               int (*callback)(struct lbtf_private *,
 538                               unsigned long, struct cmd_header *),
 539               unsigned long callback_arg)
 540 {
 541         struct cmd_ctrl_node *cmdnode;
 542         unsigned long flags;
 543         int ret = 0;
 544
 545         cmdnode = __lbtf_cmd_async(priv, command, in_cmd, in_cmd_size,
 546                                   callback, callback_arg);
 547         if (IS_ERR(cmdnode))
 548                 return PTR_ERR(cmdnode);
 549
 550         might_sleep();
 551         ret = wait_event_interruptible(cmdnode->cmdwait_q,
 552                                        cmdnode->cmdwaitqwoken);
 553        if (ret) {
 554                 printk(KERN_DEBUG
 555                        "libertastf: command 0x%04x interrupted by signal",
 556                        command);
 557                 return ret;
 558         }
 559
 560         spin_lock_irqsave(&priv->driver_lock, flags);
 561         ret = cmdnode->result;
 562         if (ret)
 563                 printk(KERN_DEBUG "libertastf: command 0x%04x failed: %d\n",
 564                             command, ret);
 565
 566         __lbtf_cleanup_and_insert_cmd(priv, cmdnode);
 567         spin_unlock_irqrestore(&priv->driver_lock, flags);
 568
 569         return ret;
 570 }
 571 EXPORT_SYMBOL_GPL(__lbtf_cmd);
 572
 573 /* Call holding driver_lock */
 574 void lbtf_cmd_response_rx(struct lbtf_private *priv)
 575 {
 576         priv->cmd_response_rxed = 1;
 577         queue_work(lbtf_wq, &priv->cmd_work);
 578 }
 579 EXPORT_SYMBOL_GPL(lbtf_cmd_response_rx);
 580
 581 int lbtf_process_rx_command(struct lbtf_private *priv)
 582 {
 583         uint16_t respcmd, curcmd;
 584         struct cmd_header *resp;
 585         int ret = 0;
 586         unsigned long flags;
 587         uint16_t result;
 588
 589         mutex_lock(&priv->lock);
 590         spin_lock_irqsave(&priv->driver_lock, flags);
 591
 592         if (!priv->cur_cmd) {
 593                 ret = -1;
 594                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 595                 goto done;
 596         }
 597
 598         resp = (void *)priv->cmd_resp_buff;
 599         curcmd = le16_to_cpu(priv->cur_cmd->cmdbuf->command);
 600         respcmd = le16_to_cpu(resp->command);
 601         result = le16_to_cpu(resp->result);
 602
 603         if (net_ratelimit())
 604                 printk(KERN_DEBUG "libertastf: cmd response 0x%04x, seq %d, size %d\n",
 605                         respcmd, le16_to_cpu(resp->seqnum),
 606                         le16_to_cpu(resp->size));
 607
 608         if (resp->seqnum != priv->cur_cmd->cmdbuf->seqnum) {
 609                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 610                 ret = -1;
 611                 goto done;
 612         }
 613         if (respcmd != CMD_RET(curcmd)) {
 614                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 615                 ret = -1;
 616                 goto done;
 617         }
 618
 619         if (resp->result == cpu_to_le16(0x0004)) {
 620                 /* 0x0004 means -EAGAIN. Drop the response, let it time out
 621                    and be resubmitted */
 622                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 623                 ret = -1;
 624                 goto done;
 625         }
 626
 627         /* Now we got response from FW, cancel the command timer */
 628         del_timer(&priv->command_timer);
 629         priv->cmd_timed_out = 0;
 630         if (priv->nr_retries)
 631                 priv->nr_retries = 0;
 632
 633         /* If the command is not successful, cleanup and return failure */
 634         if ((result != 0 || !(respcmd & 0x8000))) {
 635                 /*
 636                  * Handling errors here
 637                  */
 638                 switch (respcmd) {
 639                 case CMD_RET(CMD_GET_HW_SPEC):
 640                 case CMD_RET(CMD_802_11_RESET):
 641                         printk(KERN_DEBUG "libertastf: reset failed\n");
 642                         break;
 643
 644                 }
 645                 lbtf_complete_command(priv, priv->cur_cmd, result);
 646                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 647
 648                 ret = -1;
 649                 goto done;
 650         }
 651
 652         spin_unlock_irqrestore(&priv->driver_lock, flags);
 653
 654         if (priv->cur_cmd && priv->cur_cmd->callback) {
 655                 ret = priv->cur_cmd->callback(priv, priv->cur_cmd->callback_arg,
 656                                 resp);
 657         }
 658         spin_lock_irqsave(&priv->driver_lock, flags);
 659
 660         if (priv->cur_cmd) {
 661                 /* Clean up and Put current command back to cmdfreeq */
 662                 lbtf_complete_command(priv, priv->cur_cmd, result);
 663         }
 664         spin_unlock_irqrestore(&priv->driver_lock, flags);
 665
 666 done:
 667         mutex_unlock(&priv->lock);
 668         return ret;
 669 }