text: /*
   * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
   * All rights reserved.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   *
   * 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 "int.h"
  #include "rxtx.h"
  #include "dpc.h"
  #include "desc.h"
  #include "device.h"
  #include "usbpipe.h"
  
  #define USB_CTL_WAIT	500 /* ms */
  
  int vnt_control_out(struct vnt_private *priv, u8 request, u16 value,
  		u16 index, u16 length, u8 *buffer)
  {
  	int status = 0;
  
  	if (test_bit(DEVICE_FLAGS_DISCONNECTED, &priv->flags))
  		return STATUS_FAILURE;
  
  	mutex_lock(&priv->usb_lock);
  
  	status = usb_control_msg(priv->usb,
  		usb_sndctrlpipe(priv->usb, 0), request, 0x40, value,
  			index, buffer, length, USB_CTL_WAIT);
  
  	mutex_unlock(&priv->usb_lock);
  
  	if (status < (int)length)
  		return STATUS_FAILURE;
  
  	return STATUS_SUCCESS;
  }
  
  void vnt_control_out_u8(struct vnt_private *priv, u8 reg, u8 reg_off, u8 data)
  {
  	vnt_control_out(priv, MESSAGE_TYPE_WRITE,
  					reg_off, reg, sizeof(u8), &data);
  }
  
  int vnt_control_in(struct vnt_private *priv, u8 request, u16 value,
  		u16 index, u16 length, u8 *buffer)
  {
  	int status;
  
  	if (test_bit(DEVICE_FLAGS_DISCONNECTED, &priv->flags))
  		return STATUS_FAILURE;
  
  	mutex_lock(&priv->usb_lock);
  
  	status = usb_control_msg(priv->usb,
  		usb_rcvctrlpipe(priv->usb, 0), request, 0xc0, value,
  			index, buffer, length, USB_CTL_WAIT);
  
  	mutex_unlock(&priv->usb_lock);
  
  	if (status < (int)length)
  		return STATUS_FAILURE;
  
  	return STATUS_SUCCESS;
  }
  
  void vnt_control_in_u8(struct vnt_private *priv, u8 reg, u8 reg_off, u8 *data)
  {
  	vnt_control_in(priv, MESSAGE_TYPE_READ,
  			reg_off, reg, sizeof(u8), data);
  }
  
  static void vnt_start_interrupt_urb_complete(struct urb *urb)
  {
  	struct vnt_private *priv = urb->context;
  	int status;
  
  	switch (urb->status) {
  	case 0:
  	case -ETIMEDOUT:
  		break;
  	case -ECONNRESET:
  	case -ENOENT:
  	case -ESHUTDOWN:
  		priv->int_buf.in_use = false;
  		return;
  	default:
  		break;
  	}
  
  	status = urb->status;
  
  	if (status != STATUS_SUCCESS) {
  		priv->int_buf.in_use = false;
  
  		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);
  	else
  		priv->int_buf.in_use = true;
  }
  
  int vnt_start_interrupt_urb(struct vnt_private *priv)
  {
  	int status = STATUS_FAILURE;
  
  	if (priv->int_buf.in_use)
  		return STATUS_FAILURE;
  
  	priv->int_buf.in_use = true;
  
  	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);
  
  	status = usb_submit_urb(priv->interrupt_urb, GFP_ATOMIC);
  	if (status) {
  		dev_dbg(&priv->usb->dev, "Submit int URB failed %d\n", status);
  		priv->int_buf.in_use = false;
  	}
  
  	return status;
  }
  
  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) {
  				dev_dbg(&priv->usb->dev,
  					"Failed to re-alloc rx skb\n");
  
  				rcb->in_use = false;
  				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");
  
  		rcb->in_use = false;
  	}
  }
  
  int vnt_submit_rx_urb(struct vnt_private *priv, struct vnt_rcb *rcb)
  {
  	int status = 0;
  	struct urb *urb;
  
  	urb = rcb->urb;
  	if (rcb->skb == NULL) {
  		dev_dbg(&priv->usb->dev, "rcb->skb is null\n");
  		return status;
  	}
  
  	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);
  
  	status = usb_submit_urb(urb, GFP_ATOMIC);
  	if (status != 0) {
  		dev_dbg(&priv->usb->dev, "Submit Rx URB failed %d\n", status);
  		return STATUS_FAILURE;
  	}
  
  	rcb->in_use = true;
  
  	return status;
  }
  
  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", context->buf_len);
  		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)
  {
  	int status;
  	struct urb *urb;
  
  	if (test_bit(DEVICE_FLAGS_DISCONNECTED, &priv->flags)) {
  		context->in_use = false;
  		return STATUS_RESOURCES;
  	}
  
  	urb = context->urb;
  
  	usb_fill_bulk_urb(urb,
  			  priv->usb,
  			  usb_sndbulkpipe(priv->usb, 3),
  			  context->data,
  			  context->buf_len,
  			  vnt_tx_context_complete,
  			  context);
  
  	status = usb_submit_urb(urb, GFP_ATOMIC);
  	if (status != 0) {
  		dev_dbg(&priv->usb->dev, "Submit Tx URB failed %d\n", status);
  
  		context->in_use = false;
  		return STATUS_FAILURE;
  	}
  
  	return STATUS_PENDING;
  }
  