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