/**
 * Copyright (c) 2014 Redpine Signals Inc.
 *
 * Developer:
 *	Prameela Rani Ganrepudi <prameela.garnepudi@redpinesignals.com>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include "rsi_main.h"
#include "rsi_coex.h"
#include "rsi_hal.h"
#include "rsi_mgmt.h"

static u8 rsi_coex_determine_coex_q(struct rsi_coex_ctrl_block *coex_cb)
{
	u8 q_num = INVALID_QUEUE;

	if (skb_queue_len(&coex_cb->coex_tx_qs[VIP_Q]) > 0)
		q_num = VIP_Q;
	if (skb_queue_len(&coex_cb->coex_tx_qs[COEX_Q]) > 0)
		q_num = COEX_Q;
	if (skb_queue_len(&coex_cb->coex_tx_qs[BT_Q]) > 0)
		q_num = BT_Q;
	if (skb_queue_len(&coex_cb->coex_tx_qs[ZIGB_Q]) > 0)
		q_num = ZIGB_Q;
	if (skb_queue_len(&coex_cb->coex_tx_qs[WLAN_Q]) > 0)
		q_num = WLAN_Q;

	return q_num;
}

static void rsi_coex_sched_tx_pkts(struct rsi_coex_ctrl_block *coex_cb)
{
	u8 coex_q;
	struct sk_buff *skb;

	while (1) {
		coex_q = rsi_coex_determine_coex_q(coex_cb);
		ven_rsi_dbg(INFO_ZONE, "queue = %d\n", coex_q);

		if (coex_q == INVALID_QUEUE) {
			ven_rsi_dbg(DATA_TX_ZONE, "No more pkt\n");
			break;
		}

		down(&coex_cb->tx_bus_lock);

		if (coex_q == BT_Q) {
			skb = skb_dequeue(&coex_cb->coex_tx_qs[BT_Q]);
			rsi_send_bt_pkt(coex_cb->priv, skb);
		}

		up(&coex_cb->tx_bus_lock);
	}
}

/**
 * rsi_coex_scheduler_thread() - This function is a kernel thread to schedule
 *			       the coex packets to device
 * @common: Pointer to the driver private structure.
 *
 * Return: None.
 */
static void rsi_coex_scheduler_thread(struct rsi_common *common)
{
	struct rsi_coex_ctrl_block *coex_cb =
		(struct rsi_coex_ctrl_block *)common->coex_cb;

	u32 timeout = EVENT_WAIT_FOREVER;

	do {
		rsi_wait_event(&coex_cb->coex_tx_thread.event, timeout);
		rsi_reset_event(&coex_cb->coex_tx_thread.event);

		rsi_coex_sched_tx_pkts(coex_cb);
	} while (atomic_read(&coex_cb->coex_tx_thread.thread_done) == 0);

	complete_and_exit(&coex_cb->coex_tx_thread.completion, 0);
}

int rsi_coex_recv_pkt(struct rsi_common *common, u8 *msg)
{
	u16 msg_type = msg[2];

	if (msg_type == COMMON_CARD_READY_IND) {
		ven_rsi_dbg(INFO_ZONE, "COMMON CARD READY RECEIVED\n");
		rsi_handle_card_ready(common);
	} else if (msg_type == SLEEP_NOTIFY_IND) {
		ven_rsi_dbg(INFO_ZONE, "\n\n sleep notify RECEIVED\n");
		rsi_mgmt_pkt_recv(common, msg);
	}

	return 0;
}

int rsi_coex_send_pkt(struct rsi_common *common,
		      struct sk_buff *skb,
		      u8 hal_queue)
{
	struct rsi_coex_ctrl_block *coex_cb =
		(struct rsi_coex_ctrl_block *)common->coex_cb;
	int status = 0;

	/* Add pkt to queue if not WLAN packet */
	if (hal_queue != RSI_WLAN_Q) {
		skb_queue_tail(&coex_cb->coex_tx_qs[hal_queue], skb);
		rsi_set_event(&coex_cb->coex_tx_thread.event);
		return status;
	}

	/* Send packet to hal */
	if (skb->priority == MGMT_SOFT_Q)
		status = rsi_send_mgmt_pkt(common, skb);
	else
		status = rsi_send_data_pkt(common, skb);

	return 0;
}

int rsi_coex_init(struct rsi_common *common)
{
	struct rsi_coex_ctrl_block *coex_cb = NULL;
	int cnt;

	coex_cb = kzalloc(sizeof(*coex_cb), GFP_KERNEL);
	if (!coex_cb)
		return -ENOMEM;

	common->coex_cb = (void *)coex_cb;
	coex_cb->priv = common;
	sema_init(&coex_cb->tx_bus_lock, 1);

	/* Initialize co-ex queues */
	for (cnt = 0; cnt < NUM_COEX_TX_QUEUES; cnt++)
		skb_queue_head_init(&coex_cb->coex_tx_qs[cnt]);
	rsi_init_event(&coex_cb->coex_tx_thread.event);

	/* Initialize co-ex thread */
	if (rsi_create_kthread(common,
			       &coex_cb->coex_tx_thread,
			       rsi_coex_scheduler_thread,
			       "Coex-Tx-Thread")) {
		ven_rsi_dbg(ERR_ZONE, "%s: Unable to init tx thrd\n", __func__);
		goto err;
	}
	return 0;

err:
	return -EINVAL;
}

void rsi_coex_deinit(struct rsi_common *common)
{
	int cnt;

	struct rsi_coex_ctrl_block *coex_cb =
		(struct rsi_coex_ctrl_block *)common->coex_cb;

	/* Stop the coex tx thread */
	rsi_kill_thread(&coex_cb->coex_tx_thread);

	/* Empty the coex queue */
	for (cnt = 0; cnt < NUM_COEX_TX_QUEUES; cnt++)
		skb_queue_purge(&coex_cb->coex_tx_qs[cnt]);

	/* Free the coex control block */
	kfree(coex_cb);
}