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