Exemplo n.º 1
0
/*
 * The main process.
 *
 * This function is the main procedure of the driver and handles various driver
 * operations. It runs in a loop and provides the core functionalities.
 *
 * The main responsibilities of this function are -
 *      - Ensure concurrency control
 *      - Handle pending interrupts and call interrupt handlers
 *      - Wake up the card if required
 *      - Handle command responses and call response handlers
 *      - Handle events and call event handlers
 *      - Execute pending commands
 *      - Transmit pending data packets
 */
int mwifiex_main_process(struct mwifiex_adapter *adapter)
{
	int ret = 0;
	unsigned long flags;
	struct sk_buff *skb;

	spin_lock_irqsave(&adapter->main_proc_lock, flags);

	/* Check if already processing */
	if (adapter->mwifiex_processing) {
		spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
		goto exit_main_proc;
	} else {
		adapter->mwifiex_processing = true;
		spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
	}
process_start:
	do {
		if ((adapter->hw_status == MWIFIEX_HW_STATUS_CLOSING) ||
		    (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY))
			break;

		/* Handle pending interrupt if any */
		if (adapter->int_status) {
			if (adapter->hs_activated)
				mwifiex_process_hs_config(adapter);
			if (adapter->if_ops.process_int_status)
				adapter->if_ops.process_int_status(adapter);
		}

		/* Need to wake up the card ? */
		if ((adapter->ps_state == PS_STATE_SLEEP) &&
		    (adapter->pm_wakeup_card_req &&
		     !adapter->pm_wakeup_fw_try) &&
		    (is_command_pending(adapter) ||
		     !mwifiex_wmm_lists_empty(adapter))) {
			adapter->pm_wakeup_fw_try = true;
			adapter->if_ops.wakeup(adapter);
			continue;
		}

		if (IS_CARD_RX_RCVD(adapter)) {
			adapter->pm_wakeup_fw_try = false;
			if (adapter->ps_state == PS_STATE_SLEEP)
				adapter->ps_state = PS_STATE_AWAKE;
		} else {
			/* We have tried to wakeup the card already */
			if (adapter->pm_wakeup_fw_try)
				break;
			if (adapter->ps_state != PS_STATE_AWAKE ||
			    adapter->tx_lock_flag)
				break;

			if ((adapter->scan_processing &&
			     !adapter->scan_delay_cnt) || adapter->data_sent ||
			    mwifiex_wmm_lists_empty(adapter)) {
				if (adapter->cmd_sent || adapter->curr_cmd ||
				    (!is_command_pending(adapter)))
					break;
			}
		}

		/* Check Rx data for USB */
		if (adapter->iface_type == MWIFIEX_USB)
			while ((skb = skb_dequeue(&adapter->usb_rx_data_q)))
				mwifiex_handle_rx_packet(adapter, skb);

		/* Check for Cmd Resp */
		if (adapter->cmd_resp_received) {
			adapter->cmd_resp_received = false;
			mwifiex_process_cmdresp(adapter);

			/* call mwifiex back when init_fw is done */
			if (adapter->hw_status == MWIFIEX_HW_STATUS_INIT_DONE) {
				adapter->hw_status = MWIFIEX_HW_STATUS_READY;
				mwifiex_init_fw_complete(adapter);
			}
		}

		/* Check for event */
		if (adapter->event_received) {
			adapter->event_received = false;
			mwifiex_process_event(adapter);
		}

		/* Check if we need to confirm Sleep Request
		   received previously */
		if (adapter->ps_state == PS_STATE_PRE_SLEEP) {
			if (!adapter->cmd_sent && !adapter->curr_cmd)
				mwifiex_check_ps_cond(adapter);
		}

		/* * The ps_state may have been changed during processing of
		 * Sleep Request event.
		 */
		if ((adapter->ps_state == PS_STATE_SLEEP) ||
		    (adapter->ps_state == PS_STATE_PRE_SLEEP) ||
		    (adapter->ps_state == PS_STATE_SLEEP_CFM) ||
		    adapter->tx_lock_flag)
			continue;

		if (!adapter->cmd_sent && !adapter->curr_cmd) {
			if (mwifiex_exec_next_cmd(adapter) == -1) {
				ret = -1;
				break;
			}
		}

		if ((!adapter->scan_processing || adapter->scan_delay_cnt) &&
		    !adapter->data_sent && !mwifiex_wmm_lists_empty(adapter)) {
			mwifiex_wmm_process_tx(adapter);
			if (adapter->hs_activated) {
				adapter->is_hs_configured = false;
				mwifiex_hs_activated_event
					(mwifiex_get_priv
					 (adapter, MWIFIEX_BSS_ROLE_ANY),
					 false);
			}
		}

		if (adapter->delay_null_pkt && !adapter->cmd_sent &&
		    !adapter->curr_cmd && !is_command_pending(adapter) &&
		    mwifiex_wmm_lists_empty(adapter)) {
			if (!mwifiex_send_null_packet
			    (mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_STA),
			     MWIFIEX_TxPD_POWER_MGMT_NULL_PACKET |
			     MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET)) {
				adapter->delay_null_pkt = false;
				adapter->ps_state = PS_STATE_SLEEP;
			}
			break;
		}
	} while (true);

	if ((adapter->int_status) || IS_CARD_RX_RCVD(adapter))
		goto process_start;

	spin_lock_irqsave(&adapter->main_proc_lock, flags);
	adapter->mwifiex_processing = false;
	spin_unlock_irqrestore(&adapter->main_proc_lock, flags);

exit_main_proc:
	if (adapter->hw_status == MWIFIEX_HW_STATUS_CLOSING)
		mwifiex_shutdown_drv(adapter);
	return ret;
}
Exemplo n.º 2
0
/*
 * The main process.
 *
 * This function is the main procedure of the driver and handles various driver
 * operations. It runs in a loop and provides the core functionalities.
 *
 * The main responsibilities of this function are -
 *      - Ensure concurrency control
 *      - Handle pending interrupts and call interrupt handlers
 *      - Wake up the card if required
 *      - Handle command responses and call response handlers
 *      - Handle events and call event handlers
 *      - Execute pending commands
 *      - Transmit pending data packets
 */
int mwifiex_main_process(struct mwifiex_adapter *adapter)
{
	int ret = 0;
	unsigned long flags;

	spin_lock_irqsave(&adapter->main_proc_lock, flags);

	/* Check if already processing */
	if (adapter->mwifiex_processing) {
		spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
		goto exit_main_proc;
	} else {
		adapter->mwifiex_processing = true;
		spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
	}
process_start:
	do {
		if ((adapter->hw_status == MWIFIEX_HW_STATUS_CLOSING) ||
		    (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY))
			break;

		/* For non-USB interfaces, If we process interrupts first, it
		 * would increase RX pending even further. Avoid this by
		 * checking if rx_pending has crossed high threshold and
		 * schedule rx work queue and then process interrupts.
		 * For USB interface, there are no interrupts. We already have
		 * HIGH_RX_PENDING check in usb.c
		 */
		if (atomic_read(&adapter->rx_pending) >= HIGH_RX_PENDING &&
		    adapter->iface_type != MWIFIEX_USB) {
			adapter->delay_main_work = true;
			if (!adapter->rx_processing)
				queue_work(adapter->rx_workqueue,
					   &adapter->rx_work);
			break;
		}

		/* Handle pending interrupt if any */
		if (adapter->int_status) {
			if (adapter->hs_activated)
				mwifiex_process_hs_config(adapter);
			if (adapter->if_ops.process_int_status)
				adapter->if_ops.process_int_status(adapter);
		}

		if (adapter->rx_work_enabled && adapter->data_received)
			queue_work(adapter->rx_workqueue, &adapter->rx_work);

		/* Need to wake up the card ? */
		if ((adapter->ps_state == PS_STATE_SLEEP) &&
		    (adapter->pm_wakeup_card_req &&
		     !adapter->pm_wakeup_fw_try) &&
		    (is_command_pending(adapter) ||
		     !mwifiex_wmm_lists_empty(adapter))) {
			adapter->pm_wakeup_fw_try = true;
			adapter->if_ops.wakeup(adapter);
			continue;
		}

		if (IS_CARD_RX_RCVD(adapter)) {
			adapter->data_received = false;
			adapter->pm_wakeup_fw_try = false;
			if (adapter->ps_state == PS_STATE_SLEEP)
				adapter->ps_state = PS_STATE_AWAKE;
		} else {
			/* We have tried to wakeup the card already */
			if (adapter->pm_wakeup_fw_try)
				break;
			if (adapter->ps_state != PS_STATE_AWAKE ||
			    adapter->tx_lock_flag)
				break;

			if ((!adapter->scan_chan_gap_enabled &&
			     adapter->scan_processing) || adapter->data_sent ||
			    mwifiex_wmm_lists_empty(adapter)) {
				if (adapter->cmd_sent || adapter->curr_cmd ||
				    (!is_command_pending(adapter)))
					break;
			}
		}

		/* Check for event */
		if (adapter->event_received) {
			adapter->event_received = false;
			mwifiex_process_event(adapter);
		}

		/* Check for Cmd Resp */
		if (adapter->cmd_resp_received) {
			adapter->cmd_resp_received = false;
			mwifiex_process_cmdresp(adapter);

			/* call mwifiex back when init_fw is done */
			if (adapter->hw_status == MWIFIEX_HW_STATUS_INIT_DONE) {
				adapter->hw_status = MWIFIEX_HW_STATUS_READY;
				mwifiex_init_fw_complete(adapter);
			}
		}

		/* Check if we need to confirm Sleep Request
		   received previously */
		if (adapter->ps_state == PS_STATE_PRE_SLEEP) {
			if (!adapter->cmd_sent && !adapter->curr_cmd)
				mwifiex_check_ps_cond(adapter);
		}

		/* * The ps_state may have been changed during processing of
		 * Sleep Request event.
		 */
		if ((adapter->ps_state == PS_STATE_SLEEP) ||
		    (adapter->ps_state == PS_STATE_PRE_SLEEP) ||
		    (adapter->ps_state == PS_STATE_SLEEP_CFM) ||
		    adapter->tx_lock_flag)
			continue;

		if (!adapter->cmd_sent && !adapter->curr_cmd) {
			if (mwifiex_exec_next_cmd(adapter) == -1) {
				ret = -1;
				break;
			}
		}

		if ((adapter->scan_chan_gap_enabled ||
		     !adapter->scan_processing) &&
		    !adapter->data_sent && !mwifiex_wmm_lists_empty(adapter)) {
			mwifiex_wmm_process_tx(adapter);
			if (adapter->hs_activated) {
				adapter->is_hs_configured = false;
				mwifiex_hs_activated_event
					(mwifiex_get_priv
					 (adapter, MWIFIEX_BSS_ROLE_ANY),
					 false);
			}
		}

		if (adapter->delay_null_pkt && !adapter->cmd_sent &&
		    !adapter->curr_cmd && !is_command_pending(adapter) &&
		    mwifiex_wmm_lists_empty(adapter)) {
			if (!mwifiex_send_null_packet
			    (mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_STA),
			     MWIFIEX_TxPD_POWER_MGMT_NULL_PACKET |
			     MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET)) {
				adapter->delay_null_pkt = false;
				adapter->ps_state = PS_STATE_SLEEP;
			}
			break;
		}
	} while (true);

	spin_lock_irqsave(&adapter->main_proc_lock, flags);
	if (!adapter->delay_main_work &&
	    (adapter->int_status || IS_CARD_RX_RCVD(adapter))) {
		spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
		goto process_start;
	}

	adapter->mwifiex_processing = false;
	spin_unlock_irqrestore(&adapter->main_proc_lock, flags);

exit_main_proc:
	if (adapter->hw_status == MWIFIEX_HW_STATUS_CLOSING)
		mwifiex_shutdown_drv(adapter);
	return ret;
}