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 int lbs_process_command_response(struct lbs_private *priv, u8 *data, u32 len)
  58 {
  59         uint16_t respcmd, curcmd;
  60         struct cmd_header *resp;
  61         int ret = 0;
  62         unsigned long flags;
  63         uint16_t result;
  64
  65         lbs_deb_enter(LBS_DEB_HOST);
  66
  67         mutex_lock(&priv->lock);
  68         spin_lock_irqsave(&priv->driver_lock, flags);
  69
  70         if (!priv->cur_cmd) {
  71                 lbs_deb_host("CMD_RESP: cur_cmd is NULL\n");
  72                 ret = -1;
  73                 spin_unlock_irqrestore(&priv->driver_lock, flags);
  74                 goto done;
  75         }
  76
  77         resp = (void *)data;
  78         curcmd = le16_to_cpu(priv->cur_cmd->cmdbuf->command);
  79         respcmd = le16_to_cpu(resp->command);
  80         result = le16_to_cpu(resp->result);
  81
  82         lbs_deb_cmd("CMD_RESP: response 0x%04x, seq %d, size %d\n",
  83                      respcmd, le16_to_cpu(resp->seqnum), len);
  84         lbs_deb_hex(LBS_DEB_CMD, "CMD_RESP", (void *) resp, len);
  85
  86         if (resp->seqnum != priv->cur_cmd->cmdbuf->seqnum) {
  87                 lbs_pr_info("Received CMD_RESP with invalid sequence %d (expected %d)\n",
  88                             le16_to_cpu(resp->seqnum), le16_to_cpu(priv->cur_cmd->cmdbuf->seqnum));
  89                 spin_unlock_irqrestore(&priv->driver_lock, flags);
  90                 ret = -1;
  91                 goto done;
  92         }
  93         if (respcmd != CMD_RET(curcmd) &&
  94             respcmd != CMD_RET_802_11_ASSOCIATE && curcmd != CMD_802_11_ASSOCIATE) {
  95                 lbs_pr_info("Invalid CMD_RESP %x to command %x!\n", respcmd, curcmd);
  96                 spin_unlock_irqrestore(&priv->driver_lock, flags);
  97                 ret = -1;
  98                 goto done;
  99         }
 100
 101         if (resp->result == cpu_to_le16(0x0004)) {
 102                 /* 0x0004 means -EAGAIN. Drop the response, let it time out
 103                    and be resubmitted */
 104                 lbs_pr_info("Firmware returns DEFER to command %x. Will let it time out...\n",
 105                             le16_to_cpu(resp->command));
 106                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 107                 ret = -1;
 108                 goto done;
 109         }
 110
 111         /* Now we got response from FW, cancel the command timer */
 112         del_timer(&priv->command_timer);
 113         priv->cmd_timed_out = 0;
 114
 115         /* Store the response code to cur_cmd_retcode. */
 116         priv->cur_cmd_retcode = result;
 117
 118         if (respcmd == CMD_RET(CMD_802_11_PS_MODE)) {
 119                 struct cmd_ds_802_11_ps_mode *psmode = (void *) &resp[1];
 120                 u16 action = le16_to_cpu(psmode->action);
 121
 122                 lbs_deb_host(
 123                        "CMD_RESP: PS_MODE cmd reply result 0x%x, action 0x%x\n",
 124                        result, action);
 125
 126                 if (result) {
 127                         lbs_deb_host("CMD_RESP: PS command failed with 0x%x\n",
 128                                     result);
 129                         /*
 130                          * We should not re-try enter-ps command in
 131                          * ad-hoc mode. It takes place in
 132                          * lbs_execute_next_command().
 133                          */
 134                         if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR &&
 135                             action == CMD_SUBCMD_ENTER_PS)
 136                                 priv->psmode = LBS802_11POWERMODECAM;
 137                 } else if (action == CMD_SUBCMD_ENTER_PS) {
 138                         priv->needtowakeup = 0;
 139                         priv->psstate = PS_STATE_AWAKE;
 140
 141                         lbs_deb_host("CMD_RESP: ENTER_PS command response\n");
 142                         if (priv->connect_status != LBS_CONNECTED) {
 143                                 /*
 144                                  * When Deauth Event received before Enter_PS command
 145                                  * response, We need to wake up the firmware.
 146                                  */
 147                                 lbs_deb_host(
 148                                        "disconnected, invoking lbs_ps_wakeup\n");
 149
 150                                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 151                                 mutex_unlock(&priv->lock);
 152                                 lbs_ps_wakeup(priv, 0);
 153                                 mutex_lock(&priv->lock);
 154                                 spin_lock_irqsave(&priv->driver_lock, flags);
 155                         }
 156                 } else if (action == CMD_SUBCMD_EXIT_PS) {
 157                         priv->needtowakeup = 0;
 158                         priv->psstate = PS_STATE_FULL_POWER;
 159                         lbs_deb_host("CMD_RESP: EXIT_PS command response\n");
 160                 } else {
 161                         lbs_deb_host("CMD_RESP: PS action 0x%X\n", action);
 162                 }
 163
 164                 lbs_complete_command(priv, priv->cur_cmd, result);
 165                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 166
 167                 ret = 0;
 168                 goto done;
 169         }
 170
 171         /* If the command is not successful, cleanup and return failure */
 172         if ((result != 0 || !(respcmd & 0x8000))) {
 173                 lbs_deb_host("CMD_RESP: error 0x%04x in command reply 0x%04x\n",
 174                        result, respcmd);
 175                 /*
 176                  * Handling errors here
 177                  */
 178                 switch (respcmd) {
 179                 case CMD_RET(CMD_GET_HW_SPEC):
 180                 case CMD_RET(CMD_802_11_RESET):
 181                         lbs_deb_host("CMD_RESP: reset failed\n");
 182                         break;
 183
 184                 }
 185                 lbs_complete_command(priv, priv->cur_cmd, result);
 186                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 187
 188                 ret = -1;
 189                 goto done;
 190         }
 191
 192         spin_unlock_irqrestore(&priv->driver_lock, flags);
 193
 194         if (priv->cur_cmd && priv->cur_cmd->callback) {
 195                 ret = priv->cur_cmd->callback(priv, priv->cur_cmd->callback_arg,
 196                                 resp);
 197         }
 198
 199         spin_lock_irqsave(&priv->driver_lock, flags);
 200
 201         if (priv->cur_cmd) {
 202                 /* Clean up and Put current command back to cmdfreeq */
 203                 lbs_complete_command(priv, priv->cur_cmd, result);
 204         }
 205         spin_unlock_irqrestore(&priv->driver_lock, flags);
 206
 207 done:
 208         mutex_unlock(&priv->lock);
 209         lbs_deb_leave_args(LBS_DEB_HOST, "ret %d", ret);
 210         return ret;
 211 }
 212
 213 int lbs_process_event(struct lbs_private *priv, u32 event)
 214 {
 215         int ret = 0;
 216         struct cmd_header cmd;
 217
 218         lbs_deb_enter(LBS_DEB_CMD);
 219
 220         switch (event) {
 221         case MACREG_INT_CODE_LINK_SENSED:
 222                 lbs_deb_cmd("EVENT: link sensed\n");
 223                 break;
 224
 225         case MACREG_INT_CODE_DEAUTHENTICATED:
 226                 lbs_deb_cmd("EVENT: deauthenticated\n");
 227                 lbs_mac_event_disconnected(priv);
 228                 break;
 229
 230         case MACREG_INT_CODE_DISASSOCIATED:
 231                 lbs_deb_cmd("EVENT: disassociated\n");
 232                 lbs_mac_event_disconnected(priv);
 233                 break;
 234
 235         case MACREG_INT_CODE_LINK_LOST_NO_SCAN:
 236                 lbs_deb_cmd("EVENT: link lost\n");
 237                 lbs_mac_event_disconnected(priv);
 238                 break;
 239
 240         case MACREG_INT_CODE_PS_SLEEP:
 241                 lbs_deb_cmd("EVENT: ps sleep\n");
 242
 243                 /* handle unexpected PS SLEEP event */
 244                 if (priv->psstate == PS_STATE_FULL_POWER) {
 245                         lbs_deb_cmd(
 246                                "EVENT: in FULL POWER mode, ignoreing PS_SLEEP\n");
 247                         break;
 248                 }
 249                 priv->psstate = PS_STATE_PRE_SLEEP;
 250
 251                 lbs_ps_confirm_sleep(priv);
 252
 253                 break;
 254
 255         case MACREG_INT_CODE_HOST_AWAKE:
 256                 lbs_deb_cmd("EVENT: host awake\n");
 257                 if (priv->reset_deep_sleep_wakeup)
 258                         priv->reset_deep_sleep_wakeup(priv);
 259                 priv->is_deep_sleep = 0;
 260                 lbs_cmd_async(priv, CMD_802_11_WAKEUP_CONFIRM, &cmd,
 261                                 sizeof(cmd));
 262                 priv->is_host_sleep_activated = 0;
 263                 wake_up_interruptible(&priv->host_sleep_q);
 264                 break;
 265
 266         case MACREG_INT_CODE_DEEP_SLEEP_AWAKE:
 267                 if (priv->reset_deep_sleep_wakeup)
 268                         priv->reset_deep_sleep_wakeup(priv);
 269                 lbs_deb_cmd("EVENT: ds awake\n");
 270                 priv->is_deep_sleep = 0;
 271                 priv->wakeup_dev_required = 0;
 272                 wake_up_interruptible(&priv->ds_awake_q);
 273                 break;
 274
 275         case MACREG_INT_CODE_PS_AWAKE:
 276                 lbs_deb_cmd("EVENT: ps awake\n");
 277                 /* handle unexpected PS AWAKE event */
 278                 if (priv->psstate == PS_STATE_FULL_POWER) {
 279                         lbs_deb_cmd(
 280                                "EVENT: In FULL POWER mode - ignore PS AWAKE\n");
 281                         break;
 282                 }
 283
 284                 priv->psstate = PS_STATE_AWAKE;
 285
 286                 if (priv->needtowakeup) {
 287                         /*
 288                          * wait for the command processing to finish
 289                          * before resuming sending
 290                          * priv->needtowakeup will be set to FALSE
 291                          * in lbs_ps_wakeup()
 292                          */
 293                         lbs_deb_cmd("waking up ...\n");
 294                         lbs_ps_wakeup(priv, 0);
 295                 }
 296                 break;
 297
 298         case MACREG_INT_CODE_MIC_ERR_UNICAST:
 299                 lbs_deb_cmd("EVENT: UNICAST MIC ERROR\n");
 300                 lbs_send_mic_failureevent(priv, event);
 301                 break;
 302
 303         case MACREG_INT_CODE_MIC_ERR_MULTICAST:
 304                 lbs_deb_cmd("EVENT: MULTICAST MIC ERROR\n");
 305                 lbs_send_mic_failureevent(priv, event);
 306                 break;
 307
 308         case MACREG_INT_CODE_MIB_CHANGED:
 309                 lbs_deb_cmd("EVENT: MIB CHANGED\n");
 310                 break;
 311         case MACREG_INT_CODE_INIT_DONE:
 312                 lbs_deb_cmd("EVENT: INIT DONE\n");
 313                 break;
 314         case MACREG_INT_CODE_ADHOC_BCN_LOST:
 315                 lbs_deb_cmd("EVENT: ADHOC beacon lost\n");
 316                 break;
 317         case MACREG_INT_CODE_RSSI_LOW:
 318                 lbs_pr_alert("EVENT: rssi low\n");
 319                 break;
 320         case MACREG_INT_CODE_SNR_LOW:
 321                 lbs_pr_alert("EVENT: snr low\n");
 322                 break;
 323         case MACREG_INT_CODE_MAX_FAIL:
 324                 lbs_pr_alert("EVENT: max fail\n");
 325                 break;
 326         case MACREG_INT_CODE_RSSI_HIGH:
 327                 lbs_pr_alert("EVENT: rssi high\n");
 328                 break;
 329         case MACREG_INT_CODE_SNR_HIGH:
 330                 lbs_pr_alert("EVENT: snr high\n");
 331                 break;
 332
 333         case MACREG_INT_CODE_MESH_AUTO_STARTED:
 334                 /* Ignore spurious autostart events */
 335                 lbs_pr_info("EVENT: MESH_AUTO_STARTED (ignoring)\n");
 336                 break;
 337
 338         default:
 339                 lbs_pr_alert("EVENT: unknown event id %d\n", event);
 340                 break;
 341         }
 342
 343         lbs_deb_leave_args(LBS_DEB_CMD, "ret %d", ret);
 344         return ret;
 345 }