text: // SPDX-License-Identifier: GPL-2.0
  /******************************************************************************
   * usb_intf.c
   *
   * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
   * Linux device driver for RTL8192SU
   *
   * Modifications for inclusion into the Linux staging tree are
   * Copyright(c) 2010 Larry Finger. All rights reserved.
   *
   * Contact information:
   * WLAN FAE <wlanfae@realtek.com>
   * Larry Finger <Larry.Finger@lwfinger.net>
   *
   ******************************************************************************/
  
  #define _HCI_INTF_C_
  
  #include <linux/usb.h>
  #include <linux/module.h>
  #include <linux/firmware.h>
  
  #include "osdep_service.h"
  #include "drv_types.h"
  #include "recv_osdep.h"
  #include "xmit_osdep.h"
  #include "rtl8712_efuse.h"
  #include "usb_ops.h"
  #include "usb_osintf.h"
  
  static struct usb_interface *pintf;
  
  static int r871xu_drv_init(struct usb_interface *pusb_intf,
  			   const struct usb_device_id *pdid);
  
  static void r871xu_dev_remove(struct usb_interface *pusb_intf);
  
  static const struct usb_device_id rtl871x_usb_id_tbl[] = {
  
  /* RTL8188SU */
  	/* Realtek */
  	{USB_DEVICE(0x0BDA, 0x8171)},
  	{USB_DEVICE(0x0bda, 0x8173)},
  	{USB_DEVICE(0x0bda, 0x8712)},
  	{USB_DEVICE(0x0bda, 0x8713)},
  	{USB_DEVICE(0x0bda, 0xC512)},
  	/* Abocom */
  	{USB_DEVICE(0x07B8, 0x8188)},
  	/* ASUS */
  	{USB_DEVICE(0x0B05, 0x1786)},
  	{USB_DEVICE(0x0B05, 0x1791)}, /* 11n mode disable */
  	/* Belkin */
  	{USB_DEVICE(0x050D, 0x945A)},
  	/* ISY IWL - Belkin clone */
  	{USB_DEVICE(0x050D, 0x11F1)},
  	/* Corega */
  	{USB_DEVICE(0x07AA, 0x0047)},
  	/* D-Link */
  	{USB_DEVICE(0x2001, 0x3306)},
  	{USB_DEVICE(0x07D1, 0x3306)}, /* 11n mode disable */
  	/* Edimax */
  	{USB_DEVICE(0x7392, 0x7611)},
  	/* EnGenius */
  	{USB_DEVICE(0x1740, 0x9603)},
  	/* Hawking */
  	{USB_DEVICE(0x0E66, 0x0016)},
  	/* Hercules */
  	{USB_DEVICE(0x06F8, 0xE034)},
  	{USB_DEVICE(0x06F8, 0xE032)},
  	/* Logitec */
  	{USB_DEVICE(0x0789, 0x0167)},
  	/* PCI */
  	{USB_DEVICE(0x2019, 0xAB28)},
  	{USB_DEVICE(0x2019, 0xED16)},
  	/* Sitecom */
  	{USB_DEVICE(0x0DF6, 0x0057)},
  	{USB_DEVICE(0x0DF6, 0x0045)},
  	{USB_DEVICE(0x0DF6, 0x0059)}, /* 11n mode disable */
  	{USB_DEVICE(0x0DF6, 0x004B)},
  	{USB_DEVICE(0x0DF6, 0x005B)},
  	{USB_DEVICE(0x0DF6, 0x005D)},
  	{USB_DEVICE(0x0DF6, 0x0063)},
  	/* Sweex */
  	{USB_DEVICE(0x177F, 0x0154)},
  	/* Thinkware */
  	{USB_DEVICE(0x0BDA, 0x5077)},
  	/* Toshiba */
  	{USB_DEVICE(0x1690, 0x0752)},
  	/* - */
  	{USB_DEVICE(0x20F4, 0x646B)},
  	{USB_DEVICE(0x083A, 0xC512)},
  	{USB_DEVICE(0x25D4, 0x4CA1)},
  	{USB_DEVICE(0x25D4, 0x4CAB)},
  
  /* RTL8191SU */
  	/* Realtek */
  	{USB_DEVICE(0x0BDA, 0x8172)},
  	{USB_DEVICE(0x0BDA, 0x8192)},
  	/* Amigo */
  	{USB_DEVICE(0x0EB0, 0x9061)},
  	/* ASUS/EKB */
  	{USB_DEVICE(0x13D3, 0x3323)},
  	{USB_DEVICE(0x13D3, 0x3311)}, /* 11n mode disable */
  	{USB_DEVICE(0x13D3, 0x3342)},
  	/* ASUS/EKBLenovo */
  	{USB_DEVICE(0x13D3, 0x3333)},
  	{USB_DEVICE(0x13D3, 0x3334)},
  	{USB_DEVICE(0x13D3, 0x3335)}, /* 11n mode disable */
  	{USB_DEVICE(0x13D3, 0x3336)}, /* 11n mode disable */
  	/* ASUS/Media BOX */
  	{USB_DEVICE(0x13D3, 0x3309)},
  	/* Belkin */
  	{USB_DEVICE(0x050D, 0x815F)},
  	/* D-Link */
  	{USB_DEVICE(0x07D1, 0x3302)},
  	{USB_DEVICE(0x07D1, 0x3300)},
  	{USB_DEVICE(0x07D1, 0x3303)},
  	/* Edimax */
  	{USB_DEVICE(0x7392, 0x7612)},
  	/* EnGenius */
  	{USB_DEVICE(0x1740, 0x9605)},
  	/* Guillemot */
  	{USB_DEVICE(0x06F8, 0xE031)},
  	/* Hawking */
  	{USB_DEVICE(0x0E66, 0x0015)},
  	/* Mediao */
  	{USB_DEVICE(0x13D3, 0x3306)},
  	/* PCI */
  	{USB_DEVICE(0x2019, 0xED18)},
  	{USB_DEVICE(0x2019, 0x4901)},
  	/* Sitecom */
  	{USB_DEVICE(0x0DF6, 0x0058)},
  	{USB_DEVICE(0x0DF6, 0x0049)},
  	{USB_DEVICE(0x0DF6, 0x004C)},
  	{USB_DEVICE(0x0DF6, 0x006C)},
  	{USB_DEVICE(0x0DF6, 0x0064)},
  	/* Skyworth */
  	{USB_DEVICE(0x14b2, 0x3300)},
  	{USB_DEVICE(0x14b2, 0x3301)},
  	{USB_DEVICE(0x14B2, 0x3302)},
  	/* - */
  	{USB_DEVICE(0x04F2, 0xAFF2)},
  	{USB_DEVICE(0x04F2, 0xAFF5)},
  	{USB_DEVICE(0x04F2, 0xAFF6)},
  	{USB_DEVICE(0x13D3, 0x3339)},
  	{USB_DEVICE(0x13D3, 0x3340)}, /* 11n mode disable */
  	{USB_DEVICE(0x13D3, 0x3341)}, /* 11n mode disable */
  	{USB_DEVICE(0x13D3, 0x3310)},
  	{USB_DEVICE(0x13D3, 0x3325)},
  
  /* RTL8192SU */
  	/* Realtek */
  	{USB_DEVICE(0x0BDA, 0x8174)},
  	/* Belkin */
  	{USB_DEVICE(0x050D, 0x845A)},
  	/* Corega */
  	{USB_DEVICE(0x07AA, 0x0051)},
  	/* Edimax */
  	{USB_DEVICE(0x7392, 0x7622)},
  	/* NEC */
  	{USB_DEVICE(0x0409, 0x02B6)},
  	{}
  };
  
  MODULE_DEVICE_TABLE(usb, rtl871x_usb_id_tbl);
  
  static struct specific_device_id specific_device_id_tbl[] = {
  	{.idVendor = 0x0b05, .idProduct = 0x1791,
  		 .flags = SPEC_DEV_ID_DISABLE_HT},
  	{.idVendor = 0x0df6, .idProduct = 0x0059,
  		 .flags = SPEC_DEV_ID_DISABLE_HT},
  	{.idVendor = 0x13d3, .idProduct = 0x3306,
  		 .flags = SPEC_DEV_ID_DISABLE_HT},
  	{.idVendor = 0x13D3, .idProduct = 0x3311,
  		 .flags = SPEC_DEV_ID_DISABLE_HT},
  	{.idVendor = 0x13d3, .idProduct = 0x3335,
  		 .flags = SPEC_DEV_ID_DISABLE_HT},
  	{.idVendor = 0x13d3, .idProduct = 0x3336,
  		 .flags = SPEC_DEV_ID_DISABLE_HT},
  	{.idVendor = 0x13d3, .idProduct = 0x3340,
  		 .flags = SPEC_DEV_ID_DISABLE_HT},
  	{.idVendor = 0x13d3, .idProduct = 0x3341,
  		 .flags = SPEC_DEV_ID_DISABLE_HT},
  	{}
  };
  
  struct drv_priv {
  	struct usb_driver r871xu_drv;
  	int drv_registered;
  };
  
  #ifdef CONFIG_PM
  static int r871x_suspend(struct usb_interface *pusb_intf, pm_message_t state)
  {
  	struct net_device *pnetdev = usb_get_intfdata(pusb_intf);
  	struct _adapter *padapter = netdev_priv(pnetdev);
  
  	netdev_info(pnetdev, "Suspending...\n");
  	padapter->suspended = true;
  	rtl871x_intf_stop(padapter);
  	if (pnetdev->netdev_ops->ndo_stop)
  		pnetdev->netdev_ops->ndo_stop(pnetdev);
  	mdelay(10);
  	netif_device_detach(pnetdev);
  	return 0;
  }
  
  static void rtl871x_intf_resume(struct _adapter *padapter)
  {
  	if (padapter->dvobjpriv.inirp_init)
  		padapter->dvobjpriv.inirp_init(padapter);
  }
  
  static int r871x_resume(struct usb_interface *pusb_intf)
  {
  	struct net_device *pnetdev = usb_get_intfdata(pusb_intf);
  	struct _adapter *padapter = netdev_priv(pnetdev);
  
  	netdev_info(pnetdev,  "Resuming...\n");
  	netif_device_attach(pnetdev);
  	if (pnetdev->netdev_ops->ndo_open)
  		pnetdev->netdev_ops->ndo_open(pnetdev);
  	padapter->suspended = false;
  	rtl871x_intf_resume(padapter);
  	return 0;
  }
  #endif
  
  static struct drv_priv drvpriv = {
  	.r871xu_drv.name = "r8712u",
  	.r871xu_drv.id_table = rtl871x_usb_id_tbl,
  	.r871xu_drv.probe = r871xu_drv_init,
  	.r871xu_drv.disconnect = r871xu_dev_remove,
  #ifdef CONFIG_PM
  	.r871xu_drv.suspend = r871x_suspend,
  	.r871xu_drv.resume = r871x_resume,
  #endif
  };
  
  static uint r8712_usb_dvobj_init(struct _adapter *padapter)
  {
  	uint	status = _SUCCESS;
  	struct	usb_host_interface		*phost_iface;
  	struct	usb_interface_descriptor	*piface_desc;
  	struct dvobj_priv *pdvobjpriv = &padapter->dvobjpriv;
  	struct usb_device *pusbd = pdvobjpriv->pusbdev;
  
  	pdvobjpriv->padapter = padapter;
  	padapter->eeprom_address_size = 6;
  	phost_iface = pintf->cur_altsetting;
  	piface_desc = &phost_iface->desc;
  	pdvobjpriv->nr_endpoint = piface_desc->bNumEndpoints;
  	if (pusbd->speed == USB_SPEED_HIGH) {
  		pdvobjpriv->ishighspeed = true;
  		dev_info(&pusbd->dev, "r8712u: USB_SPEED_HIGH with %d endpoints\n",
  			 pdvobjpriv->nr_endpoint);
  	} else {
  		pdvobjpriv->ishighspeed = false;
  		dev_info(&pusbd->dev, "r8712u: USB_SPEED_LOW with %d endpoints\n",
  			 pdvobjpriv->nr_endpoint);
  	}
  	if ((r8712_alloc_io_queue(padapter)) == _FAIL)
  		status = _FAIL;
  	return status;
  }
  
  static void r8712_usb_dvobj_deinit(struct _adapter *padapter)
  {
  }
  
  void rtl871x_intf_stop(struct _adapter *padapter)
  {
  	/*disable_hw_interrupt*/
  	if (!padapter->surprise_removed) {
  		/*device still exists, so driver can do i/o operation
  		 * TODO:
  		 */
  	}
  
  	/* cancel in irp */
  	if (padapter->dvobjpriv.inirp_deinit)
  		padapter->dvobjpriv.inirp_deinit(padapter);
  	/* cancel out irp */
  	r8712_usb_write_port_cancel(padapter);
  	/* TODO:cancel other irps */
  }
  
  void r871x_dev_unload(struct _adapter *padapter)
  {
  	if (padapter->bup) {
  		/*s1.*/
  		padapter->driver_stopped = true;
  
  		/*s3.*/
  		rtl871x_intf_stop(padapter);
  
  		/*s4.*/
  		r8712_stop_drv_threads(padapter);
  
  		/*s5.*/
  		if (!padapter->surprise_removed) {
  			padapter->hw_init_completed = false;
  			rtl8712_hal_deinit(padapter);
  		}
  
  		/*s6.*/
  		if (padapter->dvobj_deinit)
  			padapter->dvobj_deinit(padapter);
  		padapter->bup = false;
  	}
  }
  
  static void disable_ht_for_spec_devid(const struct usb_device_id *pdid,
  				      struct _adapter *padapter)
  {
  	u16 vid, pid;
  	u32 flags;
  	int i;
  	int num = ARRAY_SIZE(specific_device_id_tbl);
  
  	for (i = 0; i < num; i++) {
  		vid = specific_device_id_tbl[i].idVendor;
  		pid = specific_device_id_tbl[i].idProduct;
  		flags = specific_device_id_tbl[i].flags;
  
  		if ((pdid->idVendor == vid) && (pdid->idProduct == pid) &&
  		    (flags & SPEC_DEV_ID_DISABLE_HT)) {
  			padapter->registrypriv.ht_enable = 0;
  			padapter->registrypriv.cbw40_enable = 0;
  			padapter->registrypriv.ampdu_enable = 0;
  		}
  	}
  }
  
  static const struct device_type wlan_type = {
  	.name = "wlan",
  };
  
  /*
   * drv_init() - a device potentially for us
   *
   * notes: drv_init() is called when the bus driver has located a card for us
   * to support. We accept the new device by returning 0.
   */
  static int r871xu_drv_init(struct usb_interface *pusb_intf,
  			   const struct usb_device_id *pdid)
  {
  	uint status;
  	struct _adapter *padapter = NULL;
  	struct dvobj_priv *pdvobjpriv;
  	struct net_device *pnetdev;
  	struct usb_device *udev;
  
  	/* In this probe function, O.S. will provide the usb interface pointer
  	 * to driver. We have to increase the reference count of the usb device
  	 * structure by using the usb_get_dev function.
  	 */
  	udev = interface_to_usbdev(pusb_intf);
  	usb_get_dev(udev);
  	pintf = pusb_intf;
  	/* step 1. */
  	pnetdev = r8712_init_netdev();
  	if (!pnetdev)
  		goto put_dev;
  	padapter = netdev_priv(pnetdev);
  	disable_ht_for_spec_devid(pdid, padapter);
  	pdvobjpriv = &padapter->dvobjpriv;
  	pdvobjpriv->padapter = padapter;
  	padapter->dvobjpriv.pusbdev = udev;
  	padapter->pusb_intf = pusb_intf;
  	usb_set_intfdata(pusb_intf, pnetdev);
  	SET_NETDEV_DEV(pnetdev, &pusb_intf->dev);
  	pnetdev->dev.type = &wlan_type;
  	/* step 2. */
  	padapter->dvobj_init = r8712_usb_dvobj_init;
  	padapter->dvobj_deinit = r8712_usb_dvobj_deinit;
  	padapter->halpriv.hal_bus_init = r8712_usb_hal_bus_init;
  	padapter->dvobjpriv.inirp_init = r8712_usb_inirp_init;
  	padapter->dvobjpriv.inirp_deinit = r8712_usb_inirp_deinit;
  	/* step 3.
  	 * initialize the dvobj_priv
  	 */
  	if (!padapter->dvobj_init) {
  		goto put_dev;
  	} else {
  		status = padapter->dvobj_init(padapter);
  		if (status != _SUCCESS)
  			goto free_netdev;
  	}
  	/* step 4. */
  	status = r8712_init_drv_sw(padapter);
  	if (status)
  		goto dvobj_deinit;
  	/* step 5. read efuse/eeprom data and get mac_addr */
  	{
  		int i, offset;
  		u8 mac[6];
  		u8 tmpU1b, AutoloadFail, eeprom_CustomerID;
  		u8 *pdata = padapter->eeprompriv.efuse_eeprom_data;
  
  		tmpU1b = r8712_read8(padapter, EE_9346CR);/*CR9346*/
  
  		/* To check system boot selection.*/
  		dev_info(&udev->dev, "r8712u: Boot from %s: Autoload %s\n",
  			 (tmpU1b & _9356SEL) ? "EEPROM" : "EFUSE",
  			 (tmpU1b & _EEPROM_EN) ? "OK" : "Failed");
  
  		/* To check autoload success or not.*/
  		if (tmpU1b & _EEPROM_EN) {
  			AutoloadFail = true;
  			/* The following operations prevent Efuse leakage by
  			 * turning on 2.5V.
  			 */
  			tmpU1b = r8712_read8(padapter, EFUSE_TEST + 3);
  			r8712_write8(padapter, EFUSE_TEST + 3, tmpU1b | 0x80);
  			msleep(20);
  			r8712_write8(padapter, EFUSE_TEST + 3,
  				     (tmpU1b & (~BIT(7))));
  
  			/* Retrieve Chip version.
  			 * Recognize IC version by Reg0x4 BIT15.
  			 */
  			tmpU1b = (u8)((r8712_read32(padapter, PMC_FSM) >> 15) &
  						    0x1F);
  			if (tmpU1b == 0x3)
  				padapter->registrypriv.chip_version =
  				     RTL8712_3rdCUT;
  			else
  				padapter->registrypriv.chip_version =
  				     (tmpU1b >> 1) + 1;
  			switch (padapter->registrypriv.chip_version) {
  			case RTL8712_1stCUT:
  			case RTL8712_2ndCUT:
  			case RTL8712_3rdCUT:
  				break;
  			default:
  				padapter->registrypriv.chip_version =
  				     RTL8712_2ndCUT;
  				break;
  			}
  
  			for (i = 0, offset = 0; i < 128; i += 8, offset++)
  				r8712_efuse_pg_packet_read(padapter, offset,
  						     &pdata[i]);
  
  			if (!r8712_initmac || !mac_pton(r8712_initmac, mac)) {
  				/* Use the mac address stored in the Efuse
  				 * offset = 0x12 for usb in efuse
  				 */
  				ether_addr_copy(mac, &pdata[0x12]);
  			}
  			eeprom_CustomerID = pdata[0x52];
  			switch (eeprom_CustomerID) {
  			case EEPROM_CID_ALPHA:
  				padapter->eeprompriv.CustomerID =
  						 RT_CID_819x_ALPHA;
  				break;
  			case EEPROM_CID_CAMEO:
  				padapter->eeprompriv.CustomerID =
  						 RT_CID_819x_CAMEO;
  				break;
  			case EEPROM_CID_SITECOM:
  				padapter->eeprompriv.CustomerID =
  						 RT_CID_819x_Sitecom;
  				break;
  			case EEPROM_CID_COREGA:
  				padapter->eeprompriv.CustomerID =
  						 RT_CID_COREGA;
  				break;
  			case EEPROM_CID_Senao:
  				padapter->eeprompriv.CustomerID =
  						 RT_CID_819x_Senao;
  				break;
  			case EEPROM_CID_EDIMAX_BELKIN:
  				padapter->eeprompriv.CustomerID =
  						 RT_CID_819x_Edimax_Belkin;
  				break;
  			case EEPROM_CID_SERCOMM_BELKIN:
  				padapter->eeprompriv.CustomerID =
  						 RT_CID_819x_Sercomm_Belkin;
  				break;
  			case EEPROM_CID_WNC_COREGA:
  				padapter->eeprompriv.CustomerID =
  						 RT_CID_819x_WNC_COREGA;
  				break;
  			case EEPROM_CID_WHQL:
  				break;
  			case EEPROM_CID_NetCore:
  				padapter->eeprompriv.CustomerID =
  						 RT_CID_819x_Netcore;
  				break;
  			case EEPROM_CID_CAMEO1:
  				padapter->eeprompriv.CustomerID =
  						 RT_CID_819x_CAMEO1;
  				break;
  			case EEPROM_CID_CLEVO:
  				padapter->eeprompriv.CustomerID =
  						 RT_CID_819x_CLEVO;
  				break;
  			default:
  				padapter->eeprompriv.CustomerID =
  						 RT_CID_DEFAULT;
  				break;
  			}
  			dev_info(&udev->dev, "r8712u: CustomerID = 0x%.4x\n",
  				 padapter->eeprompriv.CustomerID);
  			/* Led mode */
  			switch (padapter->eeprompriv.CustomerID) {
  			case RT_CID_DEFAULT:
  			case RT_CID_819x_ALPHA:
  			case RT_CID_819x_CAMEO:
  				padapter->ledpriv.LedStrategy = SW_LED_MODE1;
  				padapter->ledpriv.bRegUseLed = true;
  				break;
  			case RT_CID_819x_Sitecom:
  				padapter->ledpriv.LedStrategy = SW_LED_MODE2;
  				padapter->ledpriv.bRegUseLed = true;
  				break;
  			case RT_CID_COREGA:
  			case RT_CID_819x_Senao:
  				padapter->ledpriv.LedStrategy = SW_LED_MODE3;
  				padapter->ledpriv.bRegUseLed = true;
  				break;
  			case RT_CID_819x_Edimax_Belkin:
  				padapter->ledpriv.LedStrategy = SW_LED_MODE4;
  				padapter->ledpriv.bRegUseLed = true;
  				break;
  			case RT_CID_819x_Sercomm_Belkin:
  				padapter->ledpriv.LedStrategy = SW_LED_MODE5;
  				padapter->ledpriv.bRegUseLed = true;
  				break;
  			case RT_CID_819x_WNC_COREGA:
  				padapter->ledpriv.LedStrategy = SW_LED_MODE6;
  				padapter->ledpriv.bRegUseLed = true;
  				break;
  			default:
  				padapter->ledpriv.LedStrategy = SW_LED_MODE0;
  				padapter->ledpriv.bRegUseLed = false;
  				break;
  			}
  		} else {
  			AutoloadFail = false;
  		}
  		if (((mac[0] == 0xff) && (mac[1] == 0xff) &&
  		     (mac[2] == 0xff) && (mac[3] == 0xff) &&
  		     (mac[4] == 0xff) && (mac[5] == 0xff)) ||
  		    ((mac[0] == 0x00) && (mac[1] == 0x00) &&
  		     (mac[2] == 0x00) && (mac[3] == 0x00) &&
  		     (mac[4] == 0x00) && (mac[5] == 0x00)) ||
  		     (!AutoloadFail)) {
  			mac[0] = 0x00;
  			mac[1] = 0xe0;
  			mac[2] = 0x4c;
  			mac[3] = 0x87;
  			mac[4] = 0x00;
  			mac[5] = 0x00;
  		}
  		if (r8712_initmac) {
  			/* Make sure the user did not select a multicast
  			 * address by setting bit 1 of first octet.
  			 */
  			mac[0] &= 0xFE;
  			dev_info(&udev->dev,
  				"r8712u: MAC Address from user = %pM\n", mac);
  		} else {
  			dev_info(&udev->dev,
  				"r8712u: MAC Address from efuse = %pM\n", mac);
  		}
  		ether_addr_copy(pnetdev->dev_addr, mac);
  	}
  	/* step 6. Load the firmware asynchronously */
  	if (rtl871x_load_fw(padapter))
  		goto deinit_drv_sw;
  	spin_lock_init(&padapter->lock_rx_ff0_filter);
  	mutex_init(&padapter->mutex_start);
  	return 0;
  
  deinit_drv_sw:
  	r8712_free_drv_sw(padapter);
  dvobj_deinit:
  	padapter->dvobj_deinit(padapter);
  free_netdev:
  	free_netdev(pnetdev);
  put_dev:
  	usb_put_dev(udev);
  	usb_set_intfdata(pusb_intf, NULL);
  	return -ENODEV;
  }
  
  /* rmmod module & unplug(SurpriseRemoved) will call r871xu_dev_remove()
   * => how to recognize both
   */
  static void r871xu_dev_remove(struct usb_interface *pusb_intf)
  {
  	struct net_device *pnetdev = usb_get_intfdata(pusb_intf);
  	struct usb_device *udev = interface_to_usbdev(pusb_intf);
  
  	if (pnetdev) {
  		struct _adapter *padapter = netdev_priv(pnetdev);
  
  		/* never exit with a firmware callback pending */
  		wait_for_completion(&padapter->rtl8712_fw_ready);
  		pnetdev = usb_get_intfdata(pusb_intf);
  		usb_set_intfdata(pusb_intf, NULL);
  		if (!pnetdev)
  			goto firmware_load_fail;
  		release_firmware(padapter->fw);
  		if (drvpriv.drv_registered)
  			padapter->surprise_removed = true;
  		if (pnetdev->reg_state != NETREG_UNINITIALIZED)
  			unregister_netdev(pnetdev); /* will call netdev_close() */
  		flush_scheduled_work();
  		udelay(1);
  		/* Stop driver mlme relation timer */
  		r8712_stop_drv_timers(padapter);
  		r871x_dev_unload(padapter);
  		r8712_free_drv_sw(padapter);
  		free_netdev(pnetdev);
  
  		/* decrease the reference count of the usb device structure
  		 * when disconnect
  		 */
  		usb_put_dev(udev);
  	}
  firmware_load_fail:
  	/* If we didn't unplug usb dongle and remove/insert module, driver
  	 * fails on sitesurvey for the first time when device is up.
  	 * Reset usb port for sitesurvey fail issue.
  	 */
  	if (udev->state != USB_STATE_NOTATTACHED)
  		usb_reset_device(udev);
  }
  
  static int __init r8712u_drv_entry(void)
  {
  	drvpriv.drv_registered = true;
  	return usb_register(&drvpriv.r871xu_drv);
  }
  
  static void __exit r8712u_drv_halt(void)
  {
  	drvpriv.drv_registered = false;
  	usb_deregister(&drvpriv.r871xu_drv);
  }
  
  module_init(r8712u_drv_entry);
  module_exit(r8712u_drv_halt);
  