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/hardirq.h>
   7 #include <linux/slab.h>
   8 #include <linux/delay.h>
   9 #include <linux/sched.h>
  10 #include <asm/unaligned.h>
  11 #include <net/cfg80211.h>
  12
  13 #include "cfg.h"
  14 #include "cmd.h"
  15
  16 /**
  17  * lbs_mac_event_disconnected - handles disconnect event. It
  18  * reports disconnect to upper layer, clean tx/rx packets,
  19  * reset link state etc.
  20  *
  21  * @priv:       A pointer to struct lbs_private structure
  22  * @locally_generated: indicates disconnect was requested locally
  23  *              (usually by userspace)
  24  *
  25  * returns:     n/a
  26  */
  27 void lbs_mac_event_disconnected(struct lbs_private *priv,
  28                                 bool locally_generated)
  29 {
  30         if (priv->connect_status != LBS_CONNECTED)
  31                 return;
  32
  33         lbs_deb_enter(LBS_DEB_ASSOC);
  34
  35         /*
  36          * Cisco AP sends EAP failure and de-auth in less than 0.5 ms.
  37          * It causes problem in the Supplicant
  38          */
  39         msleep_interruptible(1000);
  40
  41         if (priv->wdev->iftype == NL80211_IFTYPE_STATION)
  42                 lbs_send_disconnect_notification(priv, locally_generated);
  43
  44         /* report disconnect to upper layer */
  45         netif_stop_queue(priv->dev);
  46         netif_carrier_off(priv->dev);
  47
  48         /* Free Tx and Rx packets */
  49         kfree_skb(priv->currenttxskb);
  50         priv->currenttxskb = NULL;
  51         priv->tx_pending_len = 0;
  52
  53         priv->connect_status = LBS_DISCONNECTED;
  54
  55         if (priv->psstate != PS_STATE_FULL_POWER) {
  56                 /* make firmware to exit PS mode */
  57                 lbs_deb_cmd("disconnected, so exit PS mode\n");
  58                 lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS, false);
  59         }
  60         lbs_deb_leave(LBS_DEB_ASSOC);
  61 }
  62
  63 int lbs_process_command_response(struct lbs_private *priv, u8 *data, u32 len)
  64 {
  65         uint16_t respcmd, curcmd;
  66         struct cmd_header *resp;
  67         int ret = 0;
  68         unsigned long flags;
  69         uint16_t result;
  70
  71         lbs_deb_enter(LBS_DEB_HOST);
  72
  73         mutex_lock(&priv->lock);
  74         spin_lock_irqsave(&priv->driver_lock, flags);
  75
  76         if (!priv->cur_cmd) {
  77                 lbs_deb_host("CMD_RESP: cur_cmd is NULL\n");
  78                 ret = -1;
  79                 spin_unlock_irqrestore(&priv->driver_lock, flags);
  80                 goto done;
  81         }
  82
  83         resp = (void *)data;
  84         curcmd = le16_to_cpu(priv->cur_cmd->cmdbuf->command);
  85         respcmd = le16_to_cpu(resp->command);
  86         result = le16_to_cpu(resp->result);
  87
  88         lbs_deb_cmd("CMD_RESP: response 0x%04x, seq %d, size %d\n",
  89                      respcmd, le16_to_cpu(resp->seqnum), len);
  90         lbs_deb_hex(LBS_DEB_CMD, "CMD_RESP", (void *) resp, len);
  91
  92         if (resp->seqnum != priv->cur_cmd->cmdbuf->seqnum) {
  93                 netdev_info(priv->dev,
  94                             "Received CMD_RESP with invalid sequence %d (expected %d)\n",
  95                             le16_to_cpu(resp->seqnum),
  96                             le16_to_cpu(priv->cur_cmd->cmdbuf->seqnum));
  97                 spin_unlock_irqrestore(&priv->driver_lock, flags);
  98                 ret = -1;
  99                 goto done;
 100         }
 101         if (respcmd != CMD_RET(curcmd) &&
 102             respcmd != CMD_RET_802_11_ASSOCIATE && curcmd != CMD_802_11_ASSOCIATE) {
 103                 netdev_info(priv->dev, "Invalid CMD_RESP %x to command %x!\n",
 104                             respcmd, curcmd);
 105                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 106                 ret = -1;
 107                 goto done;
 108         }
 109
 110         if (resp->result == cpu_to_le16(0x0004)) {
 111                 /* 0x0004 means -EAGAIN. Drop the response, let it time out
 112                    and be resubmitted */
 113                 netdev_info(priv->dev,
 114                             "Firmware returns DEFER to command %x. Will let it time out...\n",
 115                             le16_to_cpu(resp->command));
 116                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 117                 ret = -1;
 118                 goto done;
 119         }
 120
 121         /* Now we got response from FW, cancel the command timer */
 122         del_timer(&priv->command_timer);
 123         priv->cmd_timed_out = 0;
 124
 125         if (respcmd == CMD_RET(CMD_802_11_PS_MODE)) {
 126                 struct cmd_ds_802_11_ps_mode *psmode = (void *) &resp[1];
 127                 u16 action = le16_to_cpu(psmode->action);
 128
 129                 lbs_deb_host(
 130                        "CMD_RESP: PS_MODE cmd reply result 0x%x, action 0x%x\n",
 131                        result, action);
 132
 133                 if (result) {
 134                         lbs_deb_host("CMD_RESP: PS command failed with 0x%x\n",
 135                                     result);
 136                         /*
 137                          * We should not re-try enter-ps command in
 138                          * ad-hoc mode. It takes place in
 139                          * lbs_execute_next_command().
 140                          */
 141                         if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR &&
 142                             action == PS_MODE_ACTION_ENTER_PS)
 143                                 priv->psmode = LBS802_11POWERMODECAM;
 144                 } else if (action == PS_MODE_ACTION_ENTER_PS) {
 145                         priv->needtowakeup = 0;
 146                         priv->psstate = PS_STATE_AWAKE;
 147
 148                         lbs_deb_host("CMD_RESP: ENTER_PS command response\n");
 149                         if (priv->connect_status != LBS_CONNECTED) {
 150                                 /*
 151                                  * When Deauth Event received before Enter_PS command
 152                                  * response, We need to wake up the firmware.
 153                                  */
 154                                 lbs_deb_host(
 155                                        "disconnected, invoking lbs_ps_wakeup\n");
 156
 157                                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 158                                 mutex_unlock(&priv->lock);
 159                                 lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS,
 160                                                 false);
 161                                 mutex_lock(&priv->lock);
 162                                 spin_lock_irqsave(&priv->driver_lock, flags);
 163                         }
 164                 } else if (action == PS_MODE_ACTION_EXIT_PS) {
 165                         priv->needtowakeup = 0;
 166                         priv->psstate = PS_STATE_FULL_POWER;
 167                         lbs_deb_host("CMD_RESP: EXIT_PS command response\n");
 168                 } else {
 169                         lbs_deb_host("CMD_RESP: PS action 0x%X\n", action);
 170                 }
 171
 172                 __lbs_complete_command(priv, priv->cur_cmd, result);
 173                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 174
 175                 ret = 0;
 176                 goto done;
 177         }
 178
 179         /* If the command is not successful, cleanup and return failure */
 180         if ((result != 0 || !(respcmd & 0x8000))) {
 181                 lbs_deb_host("CMD_RESP: error 0x%04x in command reply 0x%04x\n",
 182                        result, respcmd);
 183                 /*
 184                  * Handling errors here
 185                  */
 186                 switch (respcmd) {
 187                 case CMD_RET(CMD_GET_HW_SPEC):
 188                 case CMD_RET(CMD_802_11_RESET):
 189                         lbs_deb_host("CMD_RESP: reset failed\n");
 190                         break;
 191
 192                 }
 193                 __lbs_complete_command(priv, priv->cur_cmd, result);
 194                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 195
 196                 ret = -1;
 197                 goto done;
 198         }
 199
 200         spin_unlock_irqrestore(&priv->driver_lock, flags);
 201
 202         if (priv->cur_cmd && priv->cur_cmd->callback) {
 203                 ret = priv->cur_cmd->callback(priv, priv->cur_cmd->callback_arg,
 204                                 resp);
 205         }
 206
 207         spin_lock_irqsave(&priv->driver_lock, flags);
 208
 209         if (priv->cur_cmd) {
 210                 /* Clean up and Put current command back to cmdfreeq */
 211                 __lbs_complete_command(priv, priv->cur_cmd, result);
 212         }
 213         spin_unlock_irqrestore(&priv->driver_lock, flags);
 214
 215 done:
 216         mutex_unlock(&priv->lock);
 217         lbs_deb_leave_args(LBS_DEB_HOST, "ret %d", ret);
 218         return ret;
 219 }
 220
 221 int lbs_process_event(struct lbs_private *priv, u32 event)
 222 {
 223         int ret = 0;
 224         struct cmd_header cmd;
 225
 226         lbs_deb_enter(LBS_DEB_CMD);
 227
 228         switch (event) {
 229         case MACREG_INT_CODE_LINK_SENSED:
 230                 lbs_deb_cmd("EVENT: link sensed\n");
 231                 break;
 232
 233         case MACREG_INT_CODE_DEAUTHENTICATED:
 234                 lbs_deb_cmd("EVENT: deauthenticated\n");
 235                 lbs_mac_event_disconnected(priv, false);
 236                 break;
 237
 238         case MACREG_INT_CODE_DISASSOCIATED:
 239                 lbs_deb_cmd("EVENT: disassociated\n");
 240                 lbs_mac_event_disconnected(priv, false);
 241                 break;
 242
 243         case MACREG_INT_CODE_LINK_LOST_NO_SCAN:
 244                 lbs_deb_cmd("EVENT: link lost\n");
 245                 lbs_mac_event_disconnected(priv, true);
 246                 break;
 247
 248         case MACREG_INT_CODE_PS_SLEEP:
 249                 lbs_deb_cmd("EVENT: ps sleep\n");
 250
 251                 /* handle unexpected PS SLEEP event */
 252                 if (priv->psstate == PS_STATE_FULL_POWER) {
 253                         lbs_deb_cmd(
 254                                "EVENT: in FULL POWER mode, ignoring PS_SLEEP\n");
 255                         break;
 256                 }
 257                 priv->psstate = PS_STATE_PRE_SLEEP;
 258
 259                 lbs_ps_confirm_sleep(priv);
 260
 261                 break;
 262
 263         case MACREG_INT_CODE_HOST_AWAKE:
 264                 lbs_deb_cmd("EVENT: host awake\n");
 265                 if (priv->reset_deep_sleep_wakeup)
 266                         priv->reset_deep_sleep_wakeup(priv);
 267                 priv->is_deep_sleep = 0;
 268                 lbs_cmd_async(priv, CMD_802_11_WAKEUP_CONFIRM, &cmd,
 269                                 sizeof(cmd));
 270                 priv->is_host_sleep_activated = 0;
 271                 wake_up_interruptible(&priv->host_sleep_q);
 272                 break;
 273
 274         case MACREG_INT_CODE_DEEP_SLEEP_AWAKE:
 275                 if (priv->reset_deep_sleep_wakeup)
 276                         priv->reset_deep_sleep_wakeup(priv);
 277                 lbs_deb_cmd("EVENT: ds awake\n");
 278                 priv->is_deep_sleep = 0;
 279                 priv->wakeup_dev_required = 0;
 280                 wake_up_interruptible(&priv->ds_awake_q);
 281                 break;
 282
 283         case MACREG_INT_CODE_PS_AWAKE:
 284                 lbs_deb_cmd("EVENT: ps awake\n");
 285                 /* handle unexpected PS AWAKE event */
 286                 if (priv->psstate == PS_STATE_FULL_POWER) {
 287                         lbs_deb_cmd(
 288                                "EVENT: In FULL POWER mode - ignore PS AWAKE\n");
 289                         break;
 290                 }
 291
 292                 priv->psstate = PS_STATE_AWAKE;
 293
 294                 if (priv->needtowakeup) {
 295                         /*
 296                          * wait for the command processing to finish
 297                          * before resuming sending
 298                          * priv->needtowakeup will be set to FALSE
 299                          * in lbs_ps_wakeup()
 300                          */
 301                         lbs_deb_cmd("waking up ...\n");
 302                         lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS, false);
 303                 }
 304                 break;
 305
 306         case MACREG_INT_CODE_MIC_ERR_UNICAST:
 307                 lbs_deb_cmd("EVENT: UNICAST MIC ERROR\n");
 308                 lbs_send_mic_failureevent(priv, event);
 309                 break;
 310
 311         case MACREG_INT_CODE_MIC_ERR_MULTICAST:
 312                 lbs_deb_cmd("EVENT: MULTICAST MIC ERROR\n");
 313                 lbs_send_mic_failureevent(priv, event);
 314                 break;
 315
 316         case MACREG_INT_CODE_MIB_CHANGED:
 317                 lbs_deb_cmd("EVENT: MIB CHANGED\n");
 318                 break;
 319         case MACREG_INT_CODE_INIT_DONE:
 320                 lbs_deb_cmd("EVENT: INIT DONE\n");
 321                 break;
 322         case MACREG_INT_CODE_ADHOC_BCN_LOST:
 323                 lbs_deb_cmd("EVENT: ADHOC beacon lost\n");
 324                 break;
 325         case MACREG_INT_CODE_RSSI_LOW:
 326                 netdev_alert(priv->dev, "EVENT: rssi low\n");
 327                 break;
 328         case MACREG_INT_CODE_SNR_LOW:
 329                 netdev_alert(priv->dev, "EVENT: snr low\n");
 330                 break;
 331         case MACREG_INT_CODE_MAX_FAIL:
 332                 netdev_alert(priv->dev, "EVENT: max fail\n");
 333                 break;
 334         case MACREG_INT_CODE_RSSI_HIGH:
 335                 netdev_alert(priv->dev, "EVENT: rssi high\n");
 336                 break;
 337         case MACREG_INT_CODE_SNR_HIGH:
 338                 netdev_alert(priv->dev, "EVENT: snr high\n");
 339                 break;
 340
 341         case MACREG_INT_CODE_MESH_AUTO_STARTED:
 342                 /* Ignore spurious autostart events */
 343                 netdev_info(priv->dev, "EVENT: MESH_AUTO_STARTED (ignoring)\n");
 344                 break;
 345
 346         default:
 347                 netdev_alert(priv->dev, "EVENT: unknown event id %d\n", event);
 348                 break;
 349         }
 350
 351         lbs_deb_leave_args(LBS_DEB_CMD, "ret %d", ret);
 352         return ret;
 353 }