// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
 * All rights reserved.
 *
 * File: usbpipe.c
 *
 * Purpose: Handle USB control endpoint
 *
 * Author: Warren Hsu
 *
 * Date: Mar. 29, 2005
 *
 * Functions:
 *	vnt_control_out - Write variable length bytes to MEM/BB/MAC/EEPROM
 *	vnt_control_in - Read variable length bytes from MEM/BB/MAC/EEPROM
 *	vnt_control_out_u8 - Write one byte to MEM/BB/MAC/EEPROM
 *	vnt_control_in_u8 - Read one byte from MEM/BB/MAC/EEPROM
 *
 * Revision History:
 *      04-05-2004 Jerry Chen: Initial release
 *      11-24-2004 Warren Hsu: Add ControlvWriteByte,ControlvReadByte,
 *                             ControlvMaskByte
 *
 */

#include "rxtx.h"
#include "desc.h"
#include "device.h"
#include "usbpipe.h"
#include "mac.h"
#include "rf.h"

#define USB_CTL_WAIT	500 /* ms */

int vnt_control_out(struct vnt_private *priv, u8 request, u16 value,
		    u16 index, u16 length, const u8 *buffer)
{
	int ret = 0;
	u8 *usb_buffer;

	if (test_bit(DEVICE_FLAGS_DISCONNECTED, &priv->flags)) {
		ret = -EINVAL;
		goto end;
	}

	mutex_lock(&priv->usb_lock);

	usb_buffer = kmemdup(buffer, length, GFP_KERNEL);
	if (!usb_buffer) {
		ret = -ENOMEM;
		goto end_unlock;
	}

	ret = usb_control_msg(priv->usb,
			      usb_sndctrlpipe(priv->usb, 0),
			      request, 0x40, value,
			      index, usb_buffer, length, USB_CTL_WAIT);

	kfree(usb_buffer);

	if (ret == (int)length)
		ret = 0;
	else
		ret = -EIO;

end_unlock:
	mutex_unlock(&priv->usb_lock);
end:
	return ret;
}

int vnt_control_out_u8(struct vnt_private *priv, u8 reg, u8 reg_off, u8 data)
{
	return vnt_control_out(priv, MESSAGE_TYPE_WRITE,
			       reg_off, reg, sizeof(u8), &data);
}

int vnt_control_out_blocks(struct vnt_private *priv,
			   u16 block, u8 reg, u16 length, const u8 *data)
{
	int ret = 0, i;

	for (i = 0; i < length; i += block) {
		u16 len = min_t(int, length - i, block);

		ret = vnt_control_out(priv, MESSAGE_TYPE_WRITE,
				      i, reg, len, data + i);
		if (ret)
			goto end;
	}
end:
	return ret;
}

int vnt_control_in(struct vnt_private *priv, u8 request, u16 value,
		   u16 index, u16 length, u8 *buffer)
{
	int ret = 0;
	u8 *usb_buffer;

	if (test_bit(DEVICE_FLAGS_DISCONNECTED, &priv->flags)) {
		ret = -EINVAL;
		goto end;
	}

	mutex_lock(&priv->usb_lock);

	usb_buffer = kmalloc(length, GFP_KERNEL);
	if (!usb_buffer) {
		ret = -ENOMEM;
		goto end_unlock;
	}

	ret = usb_control_msg(priv->usb,
			      usb_rcvctrlpipe(priv->usb, 0),
			      request, 0xc0, value,
			      index, usb_buffer, length, USB_CTL_WAIT);

	if (ret == length)
		memcpy(buffer, usb_buffer, length);

	kfree(usb_buffer);

	if (ret == (int)length)
		ret = 0;
	else
		ret = -EIO;

end_unlock:
	mutex_unlock(&priv->usb_lock);
end:
	return ret;
}

int vnt_control_in_u8(struct vnt_private *priv, u8 reg, u8 reg_off, u8 *data)
{
	return vnt_control_in(priv, MESSAGE_TYPE_READ,
			      reg_off, reg, sizeof(u8), data);
}

static int vnt_int_report_rate(struct vnt_private *priv, u8 pkt_no, u8 tsr)
{
	struct vnt_usb_send_context *context;
	struct ieee80211_tx_info *info;
	u8 tx_retry = (tsr & 0xf0) >> 4;
	s8 idx;

	if (pkt_no >= priv->num_tx_context)
		return -EINVAL;

	context = priv->tx_context[pkt_no];

	if (!context->skb)
		return -EINVAL;

	info = IEEE80211_SKB_CB(context->skb);
	idx = info->control.rates[0].idx;

	ieee80211_tx_info_clear_status(info);

	info->status.rates[0].count = tx_retry;

	if (!(tsr & TSR_TMO)) {
		info->status.rates[0].idx = idx;

		if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
			info->flags |= IEEE80211_TX_STAT_ACK;
	}

	ieee80211_tx_status_irqsafe(priv->hw, context->skb);

	context->in_use = false;

	return 0;
}

static void vnt_int_process_data(struct vnt_private *priv)
{
	struct vnt_interrupt_data *int_data;
	struct ieee80211_low_level_stats *low_stats = &priv->low_stats;

	dev_dbg(&priv->usb->dev, "---->s_nsInterruptProcessData\n");

	int_data = (struct vnt_interrupt_data *)priv->int_buf.data_buf;

	if (int_data->tsr0 & TSR_VALID)
		vnt_int_report_rate(priv, int_data->pkt0, int_data->tsr0);

	if (int_data->tsr1 & TSR_VALID)
		vnt_int_report_rate(priv, int_data->pkt1, int_data->tsr1);

	if (int_data->tsr2 & TSR_VALID)
		vnt_int_report_rate(priv, int_data->pkt2, int_data->tsr2);

	if (int_data->tsr3 & TSR_VALID)
		vnt_int_report_rate(priv, int_data->pkt3, int_data->tsr3);

	if (!int_data->isr0)
		return;

	if (int_data->isr0 & ISR_BNTX && priv->op_mode == NL80211_IFTYPE_AP)
		vnt_schedule_command(priv, WLAN_CMD_BECON_SEND);

	priv->current_tsf = le64_to_cpu(int_data->tsf);

	low_stats->dot11RTSSuccessCount += int_data->rts_success;
	low_stats->dot11RTSFailureCount += int_data->rts_fail;
	low_stats->dot11ACKFailureCount += int_data->ack_fail;
	low_stats->dot11FCSErrorCount += int_data->fcs_err;
}

static void vnt_start_interrupt_urb_complete(struct urb *urb)
{
	struct vnt_private *priv = urb->context;
	int status = urb->status;

	switch (status) {
	case 0:
	case -ETIMEDOUT:
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		return;
	default:
		break;
	}

	if (status)
		dev_dbg(&priv->usb->dev, "%s status = %d\n", __func__, status);
	else
		vnt_int_process_data(priv);

	status = usb_submit_urb(priv->interrupt_urb, GFP_ATOMIC);
	if (status)
		dev_dbg(&priv->usb->dev, "Submit int URB failed %d\n", status);
}

int vnt_start_interrupt_urb(struct vnt_private *priv)
{
	int ret = 0;

	dev_dbg(&priv->usb->dev, "---->Interrupt Polling Thread\n");

	usb_fill_int_urb(priv->interrupt_urb,
			 priv->usb,
			 usb_rcvintpipe(priv->usb, 1),
			 priv->int_buf.data_buf,
			 MAX_INTERRUPT_SIZE,
			 vnt_start_interrupt_urb_complete,
			 priv,
			 priv->int_interval);

	ret = usb_submit_urb(priv->interrupt_urb, GFP_ATOMIC);
	if (ret)
		dev_dbg(&priv->usb->dev, "Submit int URB failed %d\n", ret);

	return ret;
}

static int vnt_rx_data(struct vnt_private *priv, struct vnt_rcb *ptr_rcb,
		       unsigned long bytes_received)
{
	struct ieee80211_hw *hw = priv->hw;
	struct ieee80211_supported_band *sband;
	struct sk_buff *skb;
	struct ieee80211_rx_status *rx_status;
	struct vnt_rx_header *head;
	struct vnt_rx_tail *tail;
	u32 frame_size;
	int ii;
	u16 rx_bitrate, pay_load_with_padding;
	u8 rate_idx = 0;
	long rx_dbm;

	skb = ptr_rcb->skb;
	rx_status = IEEE80211_SKB_RXCB(skb);

	/* [31:16]RcvByteCount ( not include 4-byte Status ) */
	head = (struct vnt_rx_header *)skb->data;
	frame_size = head->wbk_status >> 16;
	frame_size += 4;

	if (bytes_received != frame_size) {
		dev_dbg(&priv->usb->dev, "------- WRONG Length 1\n");
		return false;
	}

	if ((bytes_received > 2372) || (bytes_received <= 40)) {
		/* Frame Size error drop this packet.*/
		dev_dbg(&priv->usb->dev, "------ WRONG Length 2\n");
		return false;
	}

	/* real Frame Size = USBframe_size -4WbkStatus - 4RxStatus */
	/* -8TSF - 4RSR - 4SQ3 - ?Padding */

	/* if SQ3 the range is 24~27, if no SQ3 the range is 20~23 */

	/*Fix hardware bug => PLCP_Length error */
	if (((bytes_received - head->pay_load_len) > 27) ||
	    ((bytes_received - head->pay_load_len) < 24) ||
	    (bytes_received < head->pay_load_len)) {
		dev_dbg(&priv->usb->dev, "Wrong PLCP Length %x\n",
			head->pay_load_len);
		return false;
	}

	sband = hw->wiphy->bands[hw->conf.chandef.chan->band];
	rx_bitrate = head->rx_rate * 5; /* rx_rate * 5 */

	for (ii = 0; ii < sband->n_bitrates; ii++) {
		if (sband->bitrates[ii].bitrate == rx_bitrate) {
			rate_idx = ii;
				break;
		}
	}

	if (ii == sband->n_bitrates) {
		dev_dbg(&priv->usb->dev, "Wrong Rx Bit Rate %d\n", rx_bitrate);
		return false;
	}

	pay_load_with_padding = ((head->pay_load_len / 4) +
		((head->pay_load_len % 4) ? 1 : 0)) * 4;

	tail = (struct vnt_rx_tail *)(skb->data +
				      sizeof(*head) + pay_load_with_padding);
	priv->tsf_time = le64_to_cpu(tail->tsf_time);

	if (tail->rsr & (RSR_IVLDTYP | RSR_IVLDLEN))
		return false;

	vnt_rf_rssi_to_dbm(priv, tail->rssi, &rx_dbm);

	priv->bb_pre_ed_rssi = (u8)-rx_dbm + 1;
	priv->current_rssi = priv->bb_pre_ed_rssi;

	skb_pull(skb, sizeof(*head));
	skb_trim(skb, head->pay_load_len);

	rx_status->mactime = priv->tsf_time;
	rx_status->band = hw->conf.chandef.chan->band;
	rx_status->signal = rx_dbm;
	rx_status->flag = 0;
	rx_status->freq = hw->conf.chandef.chan->center_freq;

	if (!(tail->rsr & RSR_CRCOK))
		rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;

	rx_status->rate_idx = rate_idx;

	if (tail->new_rsr & NEWRSR_DECRYPTOK)
		rx_status->flag |= RX_FLAG_DECRYPTED;

	ieee80211_rx_irqsafe(priv->hw, skb);

	return true;
}

static void vnt_submit_rx_urb_complete(struct urb *urb)
{
	struct vnt_rcb *rcb = urb->context;
	struct vnt_private *priv = rcb->priv;

	switch (urb->status) {
	case 0:
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		return;
	case -ETIMEDOUT:
	default:
		dev_dbg(&priv->usb->dev, "BULK In failed %d\n", urb->status);
		break;
	}

	if (urb->actual_length) {
		if (vnt_rx_data(priv, rcb, urb->actual_length)) {
			rcb->skb = dev_alloc_skb(priv->rx_buf_sz);
			if (!rcb->skb)
				return;
		} else {
			skb_push(rcb->skb, skb_headroom(rcb->skb));
			skb_trim(rcb->skb, 0);
		}

		urb->transfer_buffer = skb_put(rcb->skb,
					       skb_tailroom(rcb->skb));
	}

	if (usb_submit_urb(urb, GFP_ATOMIC))
		dev_dbg(&priv->usb->dev, "Failed to re submit rx skb\n");
}

int vnt_submit_rx_urb(struct vnt_private *priv, struct vnt_rcb *rcb)
{
	int ret = 0;
	struct urb *urb = rcb->urb;

	if (!rcb->skb) {
		dev_dbg(&priv->usb->dev, "rcb->skb is null\n");
		ret = -EINVAL;
		goto end;
	}

	usb_fill_bulk_urb(urb,
			  priv->usb,
			  usb_rcvbulkpipe(priv->usb, 2),
			  skb_put(rcb->skb, skb_tailroom(rcb->skb)),
			  MAX_TOTAL_SIZE_WITH_ALL_HEADERS,
			  vnt_submit_rx_urb_complete,
			  rcb);

	ret = usb_submit_urb(urb, GFP_ATOMIC);
	if (ret)
		dev_dbg(&priv->usb->dev, "Submit Rx URB failed %d\n", ret);
end:
	return ret;
}

static void vnt_tx_context_complete(struct urb *urb)
{
	struct vnt_usb_send_context *context = urb->context;
	struct vnt_private *priv = context->priv;

	switch (urb->status) {
	case 0:
		dev_dbg(&priv->usb->dev,
			"Write %d bytes\n", urb->actual_length);
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		context->in_use = false;
		return;
	case -ETIMEDOUT:
	default:
		dev_dbg(&priv->usb->dev, "BULK Out failed %d\n", urb->status);
		break;
	}

	if (context->type == CONTEXT_DATA_PACKET)
		ieee80211_wake_queues(priv->hw);

	if (urb->status || context->type == CONTEXT_BEACON_PACKET) {
		if (context->skb)
			ieee80211_free_txskb(priv->hw, context->skb);

		context->in_use = false;
	}
}

int vnt_tx_context(struct vnt_private *priv,
		   struct vnt_usb_send_context *context,
		   struct sk_buff *skb)
{
	struct vnt_tx_usb_header *usb;
	struct urb *urb;
	int status;
	u16 count = skb->len;

	usb = skb_push(skb, sizeof(*usb));
	usb->tx_byte_count = cpu_to_le16(count);
	usb->pkt_no = context->pkt_no;
	usb->type = context->type;

	if (test_bit(DEVICE_FLAGS_DISCONNECTED, &priv->flags)) {
		context->in_use = false;
		return -ENODEV;
	}

	if (skb->len > MAX_TOTAL_SIZE_WITH_ALL_HEADERS) {
		context->in_use = false;
		return -E2BIG;
	}

	urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!urb) {
		context->in_use = false;
		return -ENOMEM;
	}

	usb_fill_bulk_urb(urb,
			  priv->usb,
			  usb_sndbulkpipe(priv->usb, 3),
			  skb->data,
			  skb->len,
			  vnt_tx_context_complete,
			  context);

	usb_anchor_urb(urb, &priv->tx_submitted);

	status = usb_submit_urb(urb, GFP_ATOMIC);
	if (status) {
		dev_dbg(&priv->usb->dev, "Submit Tx URB failed %d\n", status);
		usb_unanchor_urb(urb);
		context->in_use = false;
	}

	usb_free_urb(urb);

	return status;
}