text: // SPDX-License-Identifier: GPL-2.0
  /*
   * This file contains the handling of command
   * responses as well as events generated by firmware.
   */
  
  #include <linux/hardirq.h>
  #include <linux/slab.h>
  #include <linux/delay.h>
  #include <linux/sched.h>
  #include <asm/unaligned.h>
  #include <net/cfg80211.h>
  
  #include "cfg.h"
  #include "cmd.h"
  
  /**
   * lbs_mac_event_disconnected - handles disconnect event. It
   * reports disconnect to upper layer, clean tx/rx packets,
   * reset link state etc.
   *
   * @priv:	A pointer to struct lbs_private structure
   * @locally_generated: indicates disconnect was requested locally
   *		(usually by userspace)
   *
   * returns:	n/a
   */
  void lbs_mac_event_disconnected(struct lbs_private *priv,
  				bool locally_generated)
  {
  	unsigned long flags;
  
  	if (priv->connect_status != LBS_CONNECTED)
  		return;
  
  	/*
  	 * Cisco AP sends EAP failure and de-auth in less than 0.5 ms.
  	 * It causes problem in the Supplicant
  	 */
  	msleep_interruptible(1000);
  
  	if (priv->wdev->iftype == NL80211_IFTYPE_STATION)
  		lbs_send_disconnect_notification(priv, locally_generated);
  
  	/* report disconnect to upper layer */
  	netif_stop_queue(priv->dev);
  	netif_carrier_off(priv->dev);
  
  	/* Free Tx and Rx packets */
  	spin_lock_irqsave(&priv->driver_lock, flags);
  	kfree_skb(priv->currenttxskb);
  	priv->currenttxskb = NULL;
  	priv->tx_pending_len = 0;
  	spin_unlock_irqrestore(&priv->driver_lock, flags);
  
  	priv->connect_status = LBS_DISCONNECTED;
  
  	if (priv->psstate != PS_STATE_FULL_POWER) {
  		/* make firmware to exit PS mode */
  		lbs_deb_cmd("disconnected, so exit PS mode\n");
  		lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS, false);
  	}
  }
  
  int lbs_process_command_response(struct lbs_private *priv, u8 *data, u32 len)
  {
  	uint16_t respcmd, curcmd;
  	struct cmd_header *resp;
  	int ret = 0;
  	unsigned long flags;
  	uint16_t result;
  
  	mutex_lock(&priv->lock);
  	spin_lock_irqsave(&priv->driver_lock, flags);
  
  	if (!priv->cur_cmd) {
  		lbs_deb_host("CMD_RESP: cur_cmd is NULL\n");
  		ret = -1;
  		spin_unlock_irqrestore(&priv->driver_lock, flags);
  		goto done;
  	}
  
  	resp = (void *)data;
  	curcmd = le16_to_cpu(priv->cur_cmd->cmdbuf->command);
  	respcmd = le16_to_cpu(resp->command);
  	result = le16_to_cpu(resp->result);
  
  	lbs_deb_cmd("CMD_RESP: response 0x%04x, seq %d, size %d\n",
  		     respcmd, le16_to_cpu(resp->seqnum), len);
  	lbs_deb_hex(LBS_DEB_CMD, "CMD_RESP", (void *) resp, len);
  
  	if (resp->seqnum != priv->cur_cmd->cmdbuf->seqnum) {
  		netdev_info(priv->dev,
  			    "Received CMD_RESP with invalid sequence %d (expected %d)\n",
  			    le16_to_cpu(resp->seqnum),
  			    le16_to_cpu(priv->cur_cmd->cmdbuf->seqnum));
  		spin_unlock_irqrestore(&priv->driver_lock, flags);
  		ret = -1;
  		goto done;
  	}
  	if (respcmd != CMD_RET(curcmd) &&
  	    respcmd != CMD_RET_802_11_ASSOCIATE && curcmd != CMD_802_11_ASSOCIATE) {
  		netdev_info(priv->dev, "Invalid CMD_RESP %x to command %x!\n",
  			    respcmd, curcmd);
  		spin_unlock_irqrestore(&priv->driver_lock, flags);
  		ret = -1;
  		goto done;
  	}
  
  	if (resp->result == cpu_to_le16(0x0004)) {
  		/* 0x0004 means -EAGAIN. Drop the response, let it time out
  		   and be resubmitted */
  		netdev_info(priv->dev,
  			    "Firmware returns DEFER to command %x. Will let it time out...\n",
  			    le16_to_cpu(resp->command));
  		spin_unlock_irqrestore(&priv->driver_lock, flags);
  		ret = -1;
  		goto done;
  	}
  
  	/* Now we got response from FW, cancel the command timer */
  	del_timer(&priv->command_timer);
  	priv->cmd_timed_out = 0;
  
  	if (respcmd == CMD_RET(CMD_802_11_PS_MODE)) {
  		/* struct cmd_ds_802_11_ps_mode also contains
  		 * the header
  		 */
  		struct cmd_ds_802_11_ps_mode *psmode = (void *)resp;
  		u16 action = le16_to_cpu(psmode->action);
  
  		lbs_deb_host(
  		       "CMD_RESP: PS_MODE cmd reply result 0x%x, action 0x%x\n",
  		       result, action);
  
  		if (result) {
  			lbs_deb_host("CMD_RESP: PS command failed with 0x%x\n",
  				    result);
  			/*
  			 * We should not re-try enter-ps command in
  			 * ad-hoc mode. It takes place in
  			 * lbs_execute_next_command().
  			 */
  			if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR &&
  			    action == PS_MODE_ACTION_ENTER_PS)
  				priv->psmode = LBS802_11POWERMODECAM;
  		} else if (action == PS_MODE_ACTION_ENTER_PS) {
  			priv->needtowakeup = 0;
  			priv->psstate = PS_STATE_AWAKE;
  
  			lbs_deb_host("CMD_RESP: ENTER_PS command response\n");
  			if (priv->connect_status != LBS_CONNECTED) {
  				/*
  				 * When Deauth Event received before Enter_PS command
  				 * response, We need to wake up the firmware.
  				 */
  				lbs_deb_host(
  				       "disconnected, invoking lbs_ps_wakeup\n");
  
  				spin_unlock_irqrestore(&priv->driver_lock, flags);
  				mutex_unlock(&priv->lock);
  				lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS,
  						false);
  				mutex_lock(&priv->lock);
  				spin_lock_irqsave(&priv->driver_lock, flags);
  			}
  		} else if (action == PS_MODE_ACTION_EXIT_PS) {
  			priv->needtowakeup = 0;
  			priv->psstate = PS_STATE_FULL_POWER;
  			lbs_deb_host("CMD_RESP: EXIT_PS command response\n");
  		} else {
  			lbs_deb_host("CMD_RESP: PS action 0x%X\n", action);
  		}
  
  		__lbs_complete_command(priv, priv->cur_cmd, result);
  		spin_unlock_irqrestore(&priv->driver_lock, flags);
  
  		ret = 0;
  		goto done;
  	}
  
  	/* If the command is not successful, cleanup and return failure */
  	if ((result != 0 || !(respcmd & 0x8000))) {
  		lbs_deb_host("CMD_RESP: error 0x%04x in command reply 0x%04x\n",
  		       result, respcmd);
  		/*
  		 * Handling errors here
  		 */
  		switch (respcmd) {
  		case CMD_RET(CMD_GET_HW_SPEC):
  		case CMD_RET(CMD_802_11_RESET):
  			lbs_deb_host("CMD_RESP: reset failed\n");
  			break;
  
  		}
  		__lbs_complete_command(priv, priv->cur_cmd, result);
  		spin_unlock_irqrestore(&priv->driver_lock, flags);
  
  		ret = -1;
  		goto done;
  	}
  
  	spin_unlock_irqrestore(&priv->driver_lock, flags);
  
  	if (priv->cur_cmd && priv->cur_cmd->callback) {
  		ret = priv->cur_cmd->callback(priv, priv->cur_cmd->callback_arg,
  				resp);
  	}
  
  	spin_lock_irqsave(&priv->driver_lock, flags);
  
  	if (priv->cur_cmd) {
  		/* Clean up and Put current command back to cmdfreeq */
  		__lbs_complete_command(priv, priv->cur_cmd, result);
  	}
  	spin_unlock_irqrestore(&priv->driver_lock, flags);
  
  done:
  	mutex_unlock(&priv->lock);
  	return ret;
  }
  
  int lbs_process_event(struct lbs_private *priv, u32 event)
  {
  	int ret = 0;
  	struct cmd_header cmd;
  
  	switch (event) {
  	case MACREG_INT_CODE_LINK_SENSED:
  		lbs_deb_cmd("EVENT: link sensed\n");
  		break;
  
  	case MACREG_INT_CODE_DEAUTHENTICATED:
  		lbs_deb_cmd("EVENT: deauthenticated\n");
  		lbs_mac_event_disconnected(priv, false);
  		break;
  
  	case MACREG_INT_CODE_DISASSOCIATED:
  		lbs_deb_cmd("EVENT: disassociated\n");
  		lbs_mac_event_disconnected(priv, false);
  		break;
  
  	case MACREG_INT_CODE_LINK_LOST_NO_SCAN:
  		lbs_deb_cmd("EVENT: link lost\n");
  		lbs_mac_event_disconnected(priv, true);
  		break;
  
  	case MACREG_INT_CODE_PS_SLEEP:
  		lbs_deb_cmd("EVENT: ps sleep\n");
  
  		/* handle unexpected PS SLEEP event */
  		if (priv->psstate == PS_STATE_FULL_POWER) {
  			lbs_deb_cmd(
  			       "EVENT: in FULL POWER mode, ignoring PS_SLEEP\n");
  			break;
  		}
  		if (!list_empty(&priv->cmdpendingq)) {
  			lbs_deb_cmd("EVENT: commands in queue, do not sleep\n");
  			break;
  		}
  		priv->psstate = PS_STATE_PRE_SLEEP;
  
  		lbs_ps_confirm_sleep(priv);
  
  		break;
  
  	case MACREG_INT_CODE_HOST_AWAKE:
  		lbs_deb_cmd("EVENT: host awake\n");
  		if (priv->reset_deep_sleep_wakeup)
  			priv->reset_deep_sleep_wakeup(priv);
  		priv->is_deep_sleep = 0;
  		lbs_cmd_async(priv, CMD_802_11_WAKEUP_CONFIRM, &cmd,
  				sizeof(cmd));
  		priv->is_host_sleep_activated = 0;
  		wake_up_interruptible(&priv->host_sleep_q);
  		break;
  
  	case MACREG_INT_CODE_DEEP_SLEEP_AWAKE:
  		if (priv->reset_deep_sleep_wakeup)
  			priv->reset_deep_sleep_wakeup(priv);
  		lbs_deb_cmd("EVENT: ds awake\n");
  		priv->is_deep_sleep = 0;
  		priv->wakeup_dev_required = 0;
  		wake_up_interruptible(&priv->ds_awake_q);
  		break;
  
  	case MACREG_INT_CODE_PS_AWAKE:
  		lbs_deb_cmd("EVENT: ps awake\n");
  		/* handle unexpected PS AWAKE event */
  		if (priv->psstate == PS_STATE_FULL_POWER) {
  			lbs_deb_cmd(
  			       "EVENT: In FULL POWER mode - ignore PS AWAKE\n");
  			break;
  		}
  
  		priv->psstate = PS_STATE_AWAKE;
  
  		if (priv->needtowakeup) {
  			/*
  			 * wait for the command processing to finish
  			 * before resuming sending
  			 * priv->needtowakeup will be set to FALSE
  			 * in lbs_ps_wakeup()
  			 */
  			lbs_deb_cmd("waking up ...\n");
  			lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS, false);
  		}
  		break;
  
  	case MACREG_INT_CODE_MIC_ERR_UNICAST:
  		lbs_deb_cmd("EVENT: UNICAST MIC ERROR\n");
  		lbs_send_mic_failureevent(priv, event);
  		break;
  
  	case MACREG_INT_CODE_MIC_ERR_MULTICAST:
  		lbs_deb_cmd("EVENT: MULTICAST MIC ERROR\n");
  		lbs_send_mic_failureevent(priv, event);
  		break;
  
  	case MACREG_INT_CODE_MIB_CHANGED:
  		lbs_deb_cmd("EVENT: MIB CHANGED\n");
  		break;
  	case MACREG_INT_CODE_INIT_DONE:
  		lbs_deb_cmd("EVENT: INIT DONE\n");
  		break;
  	case MACREG_INT_CODE_ADHOC_BCN_LOST:
  		lbs_deb_cmd("EVENT: ADHOC beacon lost\n");
  		break;
  	case MACREG_INT_CODE_RSSI_LOW:
  		netdev_alert(priv->dev, "EVENT: rssi low\n");
  		break;
  	case MACREG_INT_CODE_SNR_LOW:
  		netdev_alert(priv->dev, "EVENT: snr low\n");
  		break;
  	case MACREG_INT_CODE_MAX_FAIL:
  		netdev_alert(priv->dev, "EVENT: max fail\n");
  		break;
  	case MACREG_INT_CODE_RSSI_HIGH:
  		netdev_alert(priv->dev, "EVENT: rssi high\n");
  		break;
  	case MACREG_INT_CODE_SNR_HIGH:
  		netdev_alert(priv->dev, "EVENT: snr high\n");
  		break;
  
  	case MACREG_INT_CODE_MESH_AUTO_STARTED:
  		/* Ignore spurious autostart events */
  		netdev_info(priv->dev, "EVENT: MESH_AUTO_STARTED (ignoring)\n");
  		break;
  
  	default:
  		netdev_alert(priv->dev, "EVENT: unknown event id %d\n", event);
  		break;
  	}
  
  	return ret;
  }
  