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