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
   6 #include <linux/slab.h>
   7 #include <linux/delay.h>
   8 #include <linux/sched.h>
   9 #include <asm/unaligned.h>
  10 #include <net/cfg80211.h>
  11
  12 #include "cfg.h"
  13 #include "cmd.h"
  14
  15 /**
  16  * lbs_mac_event_disconnected - handles disconnect event. It
  17  * reports disconnect to upper layer, clean tx/rx packets,
  18  * reset link state etc.
  19  *
  20  * @priv:       A pointer to struct lbs_private structure
  21  *
  22  * returns:     n/a
  23  */
  24 void lbs_mac_event_disconnected(struct lbs_private *priv)
  25 {
  26         if (priv->connect_status != LBS_CONNECTED)
  27                 return;
  28
  29         lbs_deb_enter(LBS_DEB_ASSOC);
  30
  31         /*
  32          * Cisco AP sends EAP failure and de-auth in less than 0.5 ms.
  33          * It causes problem in the Supplicant
  34          */
  35         msleep_interruptible(1000);
  36
  37         if (priv->wdev->iftype == NL80211_IFTYPE_STATION)
  38                 lbs_send_disconnect_notification(priv);
  39
  40         /* report disconnect to upper layer */
  41         netif_stop_queue(priv->dev);
  42         netif_carrier_off(priv->dev);
  43
  44         /* Free Tx and Rx packets */
  45         kfree_skb(priv->currenttxskb);
  46         priv->currenttxskb = NULL;
  47         priv->tx_pending_len = 0;
  48
  49         priv->connect_status = LBS_DISCONNECTED;
  50
  51         if (priv->psstate != PS_STATE_FULL_POWER) {
  52                 /* make firmware to exit PS mode */
  53                 lbs_deb_cmd("disconnected, so exit PS mode\n");
  54                 lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS, false);
  55         }
  56         lbs_deb_leave(LBS_DEB_ASSOC);
  57 }
  58
  59 int lbs_process_command_response(struct lbs_private *priv, u8 *data, u32 len)
  60 {
  61         uint16_t respcmd, curcmd;
  62         struct cmd_header *resp;
  63         int ret = 0;
  64         unsigned long flags;
  65         uint16_t result;
  66
  67         lbs_deb_enter(LBS_DEB_HOST);
  68
  69         mutex_lock(&priv->lock);
  70         spin_lock_irqsave(&priv->driver_lock, flags);
  71
  72         if (!priv->cur_cmd) {
  73                 lbs_deb_host("CMD_RESP: cur_cmd is NULL\n");
  74                 ret = -1;
  75                 spin_unlock_irqrestore(&priv->driver_lock, flags);
  76                 goto done;
  77         }
  78
  79         resp = (void *)data;
  80         curcmd = le16_to_cpu(priv->cur_cmd->cmdbuf->command);
  81         respcmd = le16_to_cpu(resp->command);
  82         result = le16_to_cpu(resp->result);
  83
  84         lbs_deb_cmd("CMD_RESP: response 0x%04x, seq %d, size %d\n",
  85                      respcmd, le16_to_cpu(resp->seqnum), len);
  86         lbs_deb_hex(LBS_DEB_CMD, "CMD_RESP", (void *) resp, len);
  87
  88         if (resp->seqnum != priv->cur_cmd->cmdbuf->seqnum) {
  89                 netdev_info(priv->dev,
  90                             "Received CMD_RESP with invalid sequence %d (expected %d)\n",
  91                             le16_to_cpu(resp->seqnum),
  92                             le16_to_cpu(priv->cur_cmd->cmdbuf->seqnum));
  93                 spin_unlock_irqrestore(&priv->driver_lock, flags);
  94                 ret = -1;
  95                 goto done;
  96         }
  97         if (respcmd != CMD_RET(curcmd) &&
  98             respcmd != CMD_RET_802_11_ASSOCIATE && curcmd != CMD_802_11_ASSOCIATE) {
  99                 netdev_info(priv->dev, "Invalid CMD_RESP %x to command %x!\n",
 100                             respcmd, curcmd);
 101                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 102                 ret = -1;
 103                 goto done;
 104         }
 105
 106         if (resp->result == cpu_to_le16(0x0004)) {
 107                 /* 0x0004 means -EAGAIN. Drop the response, let it time out
 108                    and be resubmitted */
 109                 netdev_info(priv->dev,
 110                             "Firmware returns DEFER to command %x. Will let it time out...\n",
 111                             le16_to_cpu(resp->command));
 112                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 113                 ret = -1;
 114                 goto done;
 115         }
 116
 117         /* Now we got response from FW, cancel the command timer */
 118         del_timer(&priv->command_timer);
 119         priv->cmd_timed_out = 0;
 120
 121         if (respcmd == CMD_RET(CMD_802_11_PS_MODE)) {
 122                 struct cmd_ds_802_11_ps_mode *psmode = (void *) &resp[1];
 123                 u16 action = le16_to_cpu(psmode->action);
 124
 125                 lbs_deb_host(
 126                        "CMD_RESP: PS_MODE cmd reply result 0x%x, action 0x%x\n",
 127                        result, action);
 128
 129                 if (result) {
 130                         lbs_deb_host("CMD_RESP: PS command failed with 0x%x\n",
 131                                     result);
 132                         /*
 133                          * We should not re-try enter-ps command in
 134                          * ad-hoc mode. It takes place in
 135                          * lbs_execute_next_command().
 136                          */
 137                         if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR &&
 138                             action == PS_MODE_ACTION_ENTER_PS)
 139                                 priv->psmode = LBS802_11POWERMODECAM;
 140                 } else if (action == PS_MODE_ACTION_ENTER_PS) {
 141                         priv->needtowakeup = 0;
 142                         priv->psstate = PS_STATE_AWAKE;
 143
 144                         lbs_deb_host("CMD_RESP: ENTER_PS command response\n");
 145                         if (priv->connect_status != LBS_CONNECTED) {
 146                                 /*
 147                                  * When Deauth Event received before Enter_PS command
 148                                  * response, We need to wake up the firmware.
 149                                  */
 150                                 lbs_deb_host(
 151                                        "disconnected, invoking lbs_ps_wakeup\n");
 152
 153                                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 154                                 mutex_unlock(&priv->lock);
 155                                 lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS,
 156                                                 false);
 157                                 mutex_lock(&priv->lock);
 158                                 spin_lock_irqsave(&priv->driver_lock, flags);
 159                         }
 160                 } else if (action == PS_MODE_ACTION_EXIT_PS) {
 161                         priv->needtowakeup = 0;
 162                         priv->psstate = PS_STATE_FULL_POWER;
 163                         lbs_deb_host("CMD_RESP: EXIT_PS command response\n");
 164                 } else {
 165                         lbs_deb_host("CMD_RESP: PS action 0x%X\n", action);
 166                 }
 167
 168                 lbs_complete_command(priv, priv->cur_cmd, result);
 169                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 170
 171                 ret = 0;
 172                 goto done;
 173         }
 174
 175         /* If the command is not successful, cleanup and return failure */
 176         if ((result != 0 || !(respcmd & 0x8000))) {
 177                 lbs_deb_host("CMD_RESP: error 0x%04x in command reply 0x%04x\n",
 178                        result, respcmd);
 179                 /*
 180                  * Handling errors here
 181                  */
 182                 switch (respcmd) {
 183                 case CMD_RET(CMD_GET_HW_SPEC):
 184                 case CMD_RET(CMD_802_11_RESET):
 185                         lbs_deb_host("CMD_RESP: reset failed\n");
 186                         break;
 187
 188                 }
 189                 lbs_complete_command(priv, priv->cur_cmd, result);
 190                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 191
 192                 ret = -1;
 193                 goto done;
 194         }
 195
 196         spin_unlock_irqrestore(&priv->driver_lock, flags);
 197
 198         if (priv->cur_cmd && priv->cur_cmd->callback) {
 199                 ret = priv->cur_cmd->callback(priv, priv->cur_cmd->callback_arg,
 200                                 resp);
 201         }
 202
 203         spin_lock_irqsave(&priv->driver_lock, flags);
 204
 205         if (priv->cur_cmd) {
 206                 /* Clean up and Put current command back to cmdfreeq */
 207                 lbs_complete_command(priv, priv->cur_cmd, result);
 208         }
 209         spin_unlock_irqrestore(&priv->driver_lock, flags);
 210
 211 done:
 212         mutex_unlock(&priv->lock);
 213         lbs_deb_leave_args(LBS_DEB_HOST, "ret %d", ret);
 214         return ret;
 215 }
 216
 217 int lbs_process_event(struct lbs_private *priv, u32 event)
 218 {
 219         int ret = 0;
 220         struct cmd_header cmd;
 221
 222         lbs_deb_enter(LBS_DEB_CMD);
 223
 224         switch (event) {
 225         case MACREG_INT_CODE_LINK_SENSED:
 226                 lbs_deb_cmd("EVENT: link sensed\n");
 227                 break;
 228
 229         case MACREG_INT_CODE_DEAUTHENTICATED:
 230                 lbs_deb_cmd("EVENT: deauthenticated\n");
 231                 lbs_mac_event_disconnected(priv);
 232                 break;
 233
 234         case MACREG_INT_CODE_DISASSOCIATED:
 235                 lbs_deb_cmd("EVENT: disassociated\n");
 236                 lbs_mac_event_disconnected(priv);
 237                 break;
 238
 239         case MACREG_INT_CODE_LINK_LOST_NO_SCAN:
 240                 lbs_deb_cmd("EVENT: link lost\n");
 241                 lbs_mac_event_disconnected(priv);
 242                 break;
 243
 244         case MACREG_INT_CODE_PS_SLEEP:
 245                 lbs_deb_cmd("EVENT: ps sleep\n");
 246
 247                 /* handle unexpected PS SLEEP event */
 248                 if (priv->psstate == PS_STATE_FULL_POWER) {
 249                         lbs_deb_cmd(
 250                                "EVENT: in FULL POWER mode, ignoreing PS_SLEEP\n");
 251                         break;
 252                 }
 253                 priv->psstate = PS_STATE_PRE_SLEEP;
 254
 255                 lbs_ps_confirm_sleep(priv);
 256
 257                 break;
 258
 259         case MACREG_INT_CODE_HOST_AWAKE:
 260                 lbs_deb_cmd("EVENT: host awake\n");
 261                 if (priv->reset_deep_sleep_wakeup)
 262                         priv->reset_deep_sleep_wakeup(priv);
 263                 priv->is_deep_sleep = 0;
 264                 lbs_cmd_async(priv, CMD_802_11_WAKEUP_CONFIRM, &cmd,
 265                                 sizeof(cmd));
 266                 priv->is_host_sleep_activated = 0;
 267                 wake_up_interruptible(&priv->host_sleep_q);
 268                 break;
 269
 270         case MACREG_INT_CODE_DEEP_SLEEP_AWAKE:
 271                 if (priv->reset_deep_sleep_wakeup)
 272                         priv->reset_deep_sleep_wakeup(priv);
 273                 lbs_deb_cmd("EVENT: ds awake\n");
 274                 priv->is_deep_sleep = 0;
 275                 priv->wakeup_dev_required = 0;
 276                 wake_up_interruptible(&priv->ds_awake_q);
 277                 break;
 278
 279         case MACREG_INT_CODE_PS_AWAKE:
 280                 lbs_deb_cmd("EVENT: ps awake\n");
 281                 /* handle unexpected PS AWAKE event */
 282                 if (priv->psstate == PS_STATE_FULL_POWER) {
 283                         lbs_deb_cmd(
 284                                "EVENT: In FULL POWER mode - ignore PS AWAKE\n");
 285                         break;
 286                 }
 287
 288                 priv->psstate = PS_STATE_AWAKE;
 289
 290                 if (priv->needtowakeup) {
 291                         /*
 292                          * wait for the command processing to finish
 293                          * before resuming sending
 294                          * priv->needtowakeup will be set to FALSE
 295                          * in lbs_ps_wakeup()
 296                          */
 297                         lbs_deb_cmd("waking up ...\n");
 298                         lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS, false);
 299                 }
 300                 break;
 301
 302         case MACREG_INT_CODE_MIC_ERR_UNICAST:
 303                 lbs_deb_cmd("EVENT: UNICAST MIC ERROR\n");
 304                 lbs_send_mic_failureevent(priv, event);
 305                 break;
 306
 307         case MACREG_INT_CODE_MIC_ERR_MULTICAST:
 308                 lbs_deb_cmd("EVENT: MULTICAST MIC ERROR\n");
 309                 lbs_send_mic_failureevent(priv, event);
 310                 break;
 311
 312         case MACREG_INT_CODE_MIB_CHANGED:
 313                 lbs_deb_cmd("EVENT: MIB CHANGED\n");
 314                 break;
 315         case MACREG_INT_CODE_INIT_DONE:
 316                 lbs_deb_cmd("EVENT: INIT DONE\n");
 317                 break;
 318         case MACREG_INT_CODE_ADHOC_BCN_LOST:
 319                 lbs_deb_cmd("EVENT: ADHOC beacon lost\n");
 320                 break;
 321         case MACREG_INT_CODE_RSSI_LOW:
 322                 netdev_alert(priv->dev, "EVENT: rssi low\n");
 323                 break;
 324         case MACREG_INT_CODE_SNR_LOW:
 325                 netdev_alert(priv->dev, "EVENT: snr low\n");
 326                 break;
 327         case MACREG_INT_CODE_MAX_FAIL:
 328                 netdev_alert(priv->dev, "EVENT: max fail\n");
 329                 break;
 330         case MACREG_INT_CODE_RSSI_HIGH:
 331                 netdev_alert(priv->dev, "EVENT: rssi high\n");
 332                 break;
 333         case MACREG_INT_CODE_SNR_HIGH:
 334                 netdev_alert(priv->dev, "EVENT: snr high\n");
 335                 break;
 336
 337         case MACREG_INT_CODE_MESH_AUTO_STARTED:
 338                 /* Ignore spurious autostart events */
 339                 netdev_info(priv->dev, "EVENT: MESH_AUTO_STARTED (ignoring)\n");
 340                 break;
 341
 342         default:
 343                 netdev_alert(priv->dev, "EVENT: unknown event id %d\n", event);
 344                 break;
 345         }
 346
 347         lbs_deb_leave_args(LBS_DEB_CMD, "ret %d", ret);
 348         return ret;
 349 }