drivers/staging/rtl8712/usb_intf.c

   1 /******************************************************************************
   2  * usb_intf.c
   3  *
   4  * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
   5  * Linux device driver for RTL8192SU
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  * Modifications for inclusion into the Linux staging tree are
  21  * Copyright(c) 2010 Larry Finger. All rights reserved.
  22  *
  23  * Contact information:
  24  * WLAN FAE <wlanfae@realtek.com>
  25  * Larry Finger <Larry.Finger@lwfinger.net>
  26  *
  27  ******************************************************************************/
  28
  29 #define _HCI_INTF_C_
  30
  31 #include "osdep_service.h"
  32 #include "drv_types.h"
  33 #include "recv_osdep.h"
  34 #include "xmit_osdep.h"
  35 #include "rtl8712_efuse.h"
  36 #include "usb_vendor_req.h"
  37 #include "usb_ops.h"
  38 #include "usb_osintf.h"
  39
  40 #define DRVER  "v7_0.20100831"
  41
  42 static struct usb_interface *pintf;
  43
  44 static int r871xu_drv_init(struct usb_interface *pusb_intf,
  45                            const struct usb_device_id *pdid);
  46
  47 static void r871xu_dev_remove(struct usb_interface *pusb_intf);
  48
  49 static struct usb_device_id rtl871x_usb_id_tbl[] = {
  50         /*92SU
  51          * Realtek */
  52         {USB_DEVICE(0x0bda, 0x8171)},
  53         {USB_DEVICE(0x0bda, 0x8172)},
  54         {USB_DEVICE(0x0bda, 0x8173)},
  55         {USB_DEVICE(0x0bda, 0x8174)},
  56         {USB_DEVICE(0x0bda, 0x8712)},
  57         {USB_DEVICE(0x0bda, 0x8713)},
  58         {USB_DEVICE(0x0bda, 0xC512)},
  59         /* Abocom  */
  60         {USB_DEVICE(0x07B8, 0x8188)},
  61         /* Corega */
  62         {USB_DEVICE(0x07aa, 0x0047)},
  63         /* Dlink */
  64         {USB_DEVICE(0x07d1, 0x3303)},
  65         {USB_DEVICE(0x07d1, 0x3302)},
  66         {USB_DEVICE(0x07d1, 0x3300)},
  67         /* Dlink for Skyworth */
  68         {USB_DEVICE(0x14b2, 0x3300)},
  69         {USB_DEVICE(0x14b2, 0x3301)},
  70         {USB_DEVICE(0x14b2, 0x3302)},
  71         /* EnGenius */
  72         {USB_DEVICE(0x1740, 0x9603)},
  73         {USB_DEVICE(0x1740, 0x9605)},
  74         /* Belkin */
  75         {USB_DEVICE(0x050d, 0x815F)},
  76         {USB_DEVICE(0x050d, 0x945A)},
  77         {USB_DEVICE(0x050d, 0x845A)},
  78         /* Guillemot */
  79         {USB_DEVICE(0x06f8, 0xe031)},
  80         /* Edimax */
  81         {USB_DEVICE(0x7392, 0x7611)},
  82         {USB_DEVICE(0x7392, 0x7612)},
  83         {USB_DEVICE(0x7392, 0x7622)},
  84         /* Sitecom */
  85         {USB_DEVICE(0x0DF6, 0x0045)},
  86         /* Hawking */
  87         {USB_DEVICE(0x0E66, 0x0015)},
  88         {USB_DEVICE(0x0E66, 0x0016)},
  89         {USB_DEVICE(0x0b05, 0x1786)},
  90         {USB_DEVICE(0x0b05, 0x1791)},    /* 11n mode disable */
  91
  92         {USB_DEVICE(0x13D3, 0x3306)},
  93         {USB_DEVICE(0x13D3, 0x3309)},
  94         {USB_DEVICE(0x13D3, 0x3310)},
  95         {USB_DEVICE(0x13D3, 0x3311)},    /* 11n mode disable */
  96         {USB_DEVICE(0x13D3, 0x3325)},
  97         {USB_DEVICE(0x083A, 0xC512)},
  98         {}
  99 };
 100
 101 MODULE_DEVICE_TABLE(usb, rtl871x_usb_id_tbl);
 102
 103 static struct specific_device_id specific_device_id_tbl[] = {
 104         {.idVendor = 0x0b05, .idProduct = 0x1791,
 105                  .flags = SPEC_DEV_ID_DISABLE_HT},
 106         {.idVendor = 0x13D3, .idProduct = 0x3311,
 107                  .flags = SPEC_DEV_ID_DISABLE_HT},
 108         {}
 109 };
 110
 111 struct drv_priv {
 112         struct usb_driver r871xu_drv;
 113         int drv_registered;
 114 };
 115
 116 #ifdef CONFIG_PM
 117 static int r871x_suspend(struct usb_interface *pusb_intf, pm_message_t state)
 118 {
 119         struct net_device *pnetdev = usb_get_intfdata(pusb_intf);
 120
 121         printk(KERN_INFO "r8712: suspending...\n");
 122         if (!pnetdev || !netif_running(pnetdev)) {
 123                 printk(KERN_INFO "r8712: unable to suspend\n");
 124                 return 0;
 125         }
 126         if (pnetdev->netdev_ops->ndo_stop)
 127                 pnetdev->netdev_ops->ndo_stop(pnetdev);
 128         mdelay(10);
 129         netif_device_detach(pnetdev);
 130         return 0;
 131 }
 132
 133 static int r871x_resume(struct usb_interface *pusb_intf)
 134 {
 135         struct net_device *pnetdev = usb_get_intfdata(pusb_intf);
 136
 137         printk(KERN_INFO "r8712: resuming...\n");
 138         if (!pnetdev || !netif_running(pnetdev)) {
 139                 printk(KERN_INFO "r8712: unable to resume\n");
 140                 return 0;
 141         }
 142         netif_device_attach(pnetdev);
 143         if (pnetdev->netdev_ops->ndo_open)
 144                 pnetdev->netdev_ops->ndo_open(pnetdev);
 145         return 0;
 146 }
 147
 148 static int r871x_reset_resume(struct usb_interface *pusb_intf)
 149 {
 150         /* dummy routine */
 151         return 0;
 152 }
 153
 154 #endif
 155
 156 static struct drv_priv drvpriv = {
 157         .r871xu_drv.name = "r8712u",
 158         .r871xu_drv.id_table = rtl871x_usb_id_tbl,
 159         .r871xu_drv.probe = r871xu_drv_init,
 160         .r871xu_drv.disconnect = r871xu_dev_remove,
 161 #ifdef CONFIG_PM
 162         .r871xu_drv.suspend = r871x_suspend,
 163         .r871xu_drv.resume = r871x_resume,
 164         .r871xu_drv.reset_resume = r871x_reset_resume,
 165 #endif
 166 };
 167
 168 static uint r8712_usb_dvobj_init(struct _adapter *padapter)
 169 {
 170         uint    status = _SUCCESS;
 171         struct  usb_device_descriptor           *pdev_desc;
 172         struct  usb_host_config                 *phost_conf;
 173         struct  usb_config_descriptor           *pconf_desc;
 174         struct  usb_host_interface              *phost_iface;
 175         struct  usb_interface_descriptor        *piface_desc;
 176         struct dvobj_priv *pdvobjpriv = &padapter->dvobjpriv;
 177         struct usb_device *pusbd = pdvobjpriv->pusbdev;
 178
 179         pdvobjpriv->padapter = padapter;
 180         padapter->EepromAddressSize = 6;
 181         pdev_desc = &pusbd->descriptor;
 182         phost_conf = pusbd->actconfig;
 183         pconf_desc = &phost_conf->desc;
 184         phost_iface = &pintf->altsetting[0];
 185         piface_desc = &phost_iface->desc;
 186         pdvobjpriv->nr_endpoint = piface_desc->bNumEndpoints;
 187         if (pusbd->speed == USB_SPEED_HIGH) {
 188                 pdvobjpriv->ishighspeed = true;
 189                 printk(KERN_INFO "r8712u: USB_SPEED_HIGH with %d endpoints\n",
 190                        pdvobjpriv->nr_endpoint);
 191         } else {
 192                 pdvobjpriv->ishighspeed = false;
 193                 printk(KERN_INFO "r8712u: USB_SPEED_LOW with %d endpoints\n",
 194                        pdvobjpriv->nr_endpoint);
 195         }
 196         if ((r8712_alloc_io_queue(padapter)) == _FAIL)
 197                 status = _FAIL;
 198         sema_init(&(padapter->dvobjpriv.usb_suspend_sema), 0);
 199         return status;
 200 }
 201
 202 static void r8712_usb_dvobj_deinit(struct _adapter *padapter)
 203 {
 204 }
 205
 206 void rtl871x_intf_stop(struct _adapter *padapter)
 207 {
 208         /*disable_hw_interrupt*/
 209         if (padapter->bSurpriseRemoved == false) {
 210                 /*device still exists, so driver can do i/o operation
 211                  * TODO: */
 212         }
 213
 214         /* cancel in irp */
 215         if (padapter->dvobjpriv.inirp_deinit != NULL)
 216                 padapter->dvobjpriv.inirp_deinit(padapter);
 217         /* cancel out irp */
 218         r8712_usb_write_port_cancel(padapter);
 219         /* TODO:cancel other irps */
 220 }
 221
 222 void r871x_dev_unload(struct _adapter *padapter)
 223 {
 224         if (padapter->bup == true) {
 225                 /*s1.*/
 226                 padapter->bDriverStopped = true;
 227
 228                 /*s3.*/
 229                 rtl871x_intf_stop(padapter);
 230
 231                 /*s4.*/
 232                 r8712_stop_drv_threads(padapter);
 233
 234                 /*s5.*/
 235                 if (padapter->bSurpriseRemoved == false) {
 236                         padapter->hw_init_completed = false;
 237                         rtl8712_hal_deinit(padapter);
 238                 }
 239
 240                 /*s6.*/
 241                 if (padapter->dvobj_deinit)
 242                         padapter->dvobj_deinit(padapter);
 243                 padapter->bup = false;
 244         }
 245 }
 246
 247 static void disable_ht_for_spec_devid(const struct usb_device_id *pdid,
 248                                       struct _adapter *padapter)
 249 {
 250         u16 vid, pid;
 251         u32 flags;
 252         int i;
 253         int num = sizeof(specific_device_id_tbl) /
 254                   sizeof(struct specific_device_id);
 255
 256         for (i = 0; i < num; i++) {
 257                 vid = specific_device_id_tbl[i].idVendor;
 258                 pid = specific_device_id_tbl[i].idProduct;
 259                 flags = specific_device_id_tbl[i].flags;
 260
 261                 if ((pdid->idVendor == vid) && (pdid->idProduct == pid) &&
 262                     (flags&SPEC_DEV_ID_DISABLE_HT)) {
 263                         padapter->registrypriv.ht_enable = 0;
 264                         padapter->registrypriv.cbw40_enable = 0;
 265                         padapter->registrypriv.ampdu_enable = 0;
 266                 }
 267         }
 268 }
 269
 270 static u8 key_2char2num(u8 hch, u8 lch)
 271 {
 272         return (hex_to_bin(hch) << 4) | hex_to_bin(lch);
 273 }
 274
 275 /*
 276  * drv_init() - a device potentially for us
 277  *
 278  * notes: drv_init() is called when the bus driver has located a card for us
 279  * to support. We accept the new device by returning 0.
 280 */
 281 static int r871xu_drv_init(struct usb_interface *pusb_intf,
 282                            const struct usb_device_id *pdid)
 283 {
 284         uint status;
 285         struct _adapter *padapter = NULL;
 286         struct dvobj_priv *pdvobjpriv;
 287         struct net_device *pnetdev;
 288
 289         printk(KERN_INFO "r8712u: DriverVersion: %s\n", DRVER);
 290         /* In this probe function, O.S. will provide the usb interface pointer
 291          * to driver. We have to increase the reference count of the usb device
 292          * structure by using the usb_get_dev function.
 293          */
 294         usb_get_dev(interface_to_usbdev(pusb_intf));
 295         pintf = pusb_intf;
 296         /* step 1. */
 297         pnetdev = r8712_init_netdev();
 298         if (!pnetdev)
 299                 goto error;
 300         padapter = (struct _adapter *)_netdev_priv(pnetdev);
 301         disable_ht_for_spec_devid(pdid, padapter);
 302         pdvobjpriv = &padapter->dvobjpriv;
 303         pdvobjpriv->padapter = padapter;
 304         padapter->dvobjpriv.pusbdev = interface_to_usbdev(pusb_intf);
 305         usb_set_intfdata(pusb_intf, pnetdev);
 306         SET_NETDEV_DEV(pnetdev, &pusb_intf->dev);
 307         /* step 2. */
 308         padapter->dvobj_init = &r8712_usb_dvobj_init;
 309         padapter->dvobj_deinit = &r8712_usb_dvobj_deinit;
 310         padapter->halpriv.hal_bus_init = &r8712_usb_hal_bus_init;
 311         padapter->dvobjpriv.inirp_init = &r8712_usb_inirp_init;
 312         padapter->dvobjpriv.inirp_deinit = &r8712_usb_inirp_deinit;
 313         /* step 3.
 314          * initialize the dvobj_priv
 315          */
 316         if (padapter->dvobj_init == NULL)
 317                         goto error;
 318         else {
 319                 status = padapter->dvobj_init(padapter);
 320                 if (status != _SUCCESS)
 321                         goto error;
 322         }
 323         /* step 4. */
 324         status = r8712_init_drv_sw(padapter);
 325         if (status == _FAIL)
 326                 goto error;
 327         /* step 5. read efuse/eeprom data and get mac_addr */
 328         {
 329                 int i, offset;
 330                 u8 mac[6];
 331                 u8 tmpU1b, AutoloadFail, eeprom_CustomerID;
 332                 u8 *pdata = padapter->eeprompriv.efuse_eeprom_data;
 333
 334                 tmpU1b = r8712_read8(padapter, EE_9346CR);/*CR9346*/
 335
 336                 /* To check system boot selection.*/
 337                 printk(KERN_INFO "r8712u: Boot from %s: Autoload %s\n",
 338                        (tmpU1b & _9356SEL) ? "EEPROM" : "EFUSE",
 339                        (tmpU1b & _EEPROM_EN) ? "OK" : "Failed");
 340
 341                 /* To check autoload success or not.*/
 342                 if (tmpU1b & _EEPROM_EN) {
 343                         AutoloadFail = true;
 344                         /* The following operations prevent Efuse leakage by
 345                          * turning on 2.5V.
 346                          */
 347                         tmpU1b = r8712_read8(padapter, EFUSE_TEST+3);
 348                         r8712_write8(padapter, EFUSE_TEST + 3, tmpU1b | 0x80);
 349                         msleep(20);
 350                         r8712_write8(padapter, EFUSE_TEST + 3,
 351                                      (tmpU1b & (~BIT(7))));
 352
 353                         /* Retrieve Chip version.
 354                          * Recognize IC version by Reg0x4 BIT15.
 355                          */
 356                         tmpU1b = (u8)((r8712_read32(padapter, PMC_FSM) >> 15) &
 357                                                     0x1F);
 358                         if (tmpU1b == 0x3)
 359                                 padapter->registrypriv.chip_version =
 360                                      RTL8712_3rdCUT;
 361                         else
 362                                 padapter->registrypriv.chip_version =
 363                                      (tmpU1b >> 1) + 1;
 364                         switch (padapter->registrypriv.chip_version) {
 365                         case RTL8712_1stCUT:
 366                         case RTL8712_2ndCUT:
 367                         case RTL8712_3rdCUT:
 368                                 break;
 369                         default:
 370                                 padapter->registrypriv.chip_version =
 371                                      RTL8712_2ndCUT;
 372                                 break;
 373                         }
 374
 375                         for (i = 0, offset = 0; i < 128; i += 8, offset++)
 376                                 r8712_efuse_pg_packet_read(padapter, offset,
 377                                                      &pdata[i]);
 378
 379                         if (r8712_initmac) {
 380                                 /* Users specify the mac address */
 381                                 int jj, kk;
 382
 383                                 for (jj = 0, kk = 0; jj < ETH_ALEN;
 384                                      jj++, kk += 3)
 385                                         mac[jj] =
 386                                            key_2char2num(r8712_initmac[kk],
 387                                            r8712_initmac[kk + 1]);
 388                         } else {
 389                                 /* Use the mac address stored in the Efuse
 390                                  * offset = 0x12 for usb in efuse
 391                                  */
 392                                 memcpy(mac, &pdata[0x12], ETH_ALEN);
 393                         }
 394                         eeprom_CustomerID = pdata[0x52];
 395                         switch (eeprom_CustomerID) {
 396                         case EEPROM_CID_ALPHA:
 397                                 padapter->eeprompriv.CustomerID =
 398                                                  RT_CID_819x_ALPHA;
 399                                 break;
 400                         case EEPROM_CID_CAMEO:
 401                                 padapter->eeprompriv.CustomerID =
 402                                                  RT_CID_819x_CAMEO;
 403                                 break;
 404                         case EEPROM_CID_SITECOM:
 405                                 padapter->eeprompriv.CustomerID =
 406                                                  RT_CID_819x_Sitecom;
 407                                 break;
 408                         case EEPROM_CID_COREGA:
 409                                 padapter->eeprompriv.CustomerID =
 410                                                  RT_CID_COREGA;
 411                                 break;
 412                         case EEPROM_CID_Senao:
 413                                 padapter->eeprompriv.CustomerID =
 414                                                  RT_CID_819x_Senao;
 415                                 break;
 416                         case EEPROM_CID_EDIMAX_BELKIN:
 417                                 padapter->eeprompriv.CustomerID =
 418                                                  RT_CID_819x_Edimax_Belkin;
 419                                 break;
 420                         case EEPROM_CID_SERCOMM_BELKIN:
 421                                 padapter->eeprompriv.CustomerID =
 422                                                  RT_CID_819x_Sercomm_Belkin;
 423                                 break;
 424                         case EEPROM_CID_WNC_COREGA:
 425                                 padapter->eeprompriv.CustomerID =
 426                                                  RT_CID_819x_WNC_COREGA;
 427                                 break;
 428                         case EEPROM_CID_WHQL:
 429                                 break;
 430                         case EEPROM_CID_NetCore:
 431                                 padapter->eeprompriv.CustomerID =
 432                                                  RT_CID_819x_Netcore;
 433                                 break;
 434                         case EEPROM_CID_CAMEO1:
 435                                 padapter->eeprompriv.CustomerID =
 436                                                  RT_CID_819x_CAMEO1;
 437                                 break;
 438                         case EEPROM_CID_CLEVO:
 439                                 padapter->eeprompriv.CustomerID =
 440                                                  RT_CID_819x_CLEVO;
 441                                 break;
 442                         default:
 443                                 padapter->eeprompriv.CustomerID =
 444                                                  RT_CID_DEFAULT;
 445                                 break;
 446                         }
 447                         printk(KERN_INFO "r8712u: CustomerID = 0x%.4x\n",
 448                              padapter->eeprompriv.CustomerID);
 449                         /* Led mode */
 450                         switch (padapter->eeprompriv.CustomerID) {
 451                         case RT_CID_DEFAULT:
 452                         case RT_CID_819x_ALPHA:
 453                         case RT_CID_819x_CAMEO:
 454                                 padapter->ledpriv.LedStrategy = SW_LED_MODE1;
 455                                 padapter->ledpriv.bRegUseLed = true;
 456                                 break;
 457                         case RT_CID_819x_Sitecom:
 458                                 padapter->ledpriv.LedStrategy = SW_LED_MODE2;
 459                                 padapter->ledpriv.bRegUseLed = true;
 460                                 break;
 461                         case RT_CID_COREGA:
 462                         case RT_CID_819x_Senao:
 463                                 padapter->ledpriv.LedStrategy = SW_LED_MODE3;
 464                                 padapter->ledpriv.bRegUseLed = true;
 465                                 break;
 466                         case RT_CID_819x_Edimax_Belkin:
 467                                 padapter->ledpriv.LedStrategy = SW_LED_MODE4;
 468                                 padapter->ledpriv.bRegUseLed = true;
 469                                 break;
 470                         case RT_CID_819x_Sercomm_Belkin:
 471                                 padapter->ledpriv.LedStrategy = SW_LED_MODE5;
 472                                 padapter->ledpriv.bRegUseLed = true;
 473                                 break;
 474                         case RT_CID_819x_WNC_COREGA:
 475                                 padapter->ledpriv.LedStrategy = SW_LED_MODE6;
 476                                 padapter->ledpriv.bRegUseLed = true;
 477                                 break;
 478                         default:
 479                                 padapter->ledpriv.LedStrategy = SW_LED_MODE0;
 480                                 padapter->ledpriv.bRegUseLed = false;
 481                                 break;
 482                         }
 483                 } else
 484                         AutoloadFail = false;
 485                 if (((mac[0] == 0xff) && (mac[1] == 0xff) &&
 486                      (mac[2] == 0xff) && (mac[3] == 0xff) &&
 487                      (mac[4] == 0xff) && (mac[5] == 0xff)) ||
 488                     ((mac[0] == 0x00) && (mac[1] == 0x00) &&
 489                      (mac[2] == 0x00) && (mac[3] == 0x00) &&
 490                      (mac[4] == 0x00) && (mac[5] == 0x00)) ||
 491                      (AutoloadFail == false)) {
 492                         mac[0] = 0x00;
 493                         mac[1] = 0xe0;
 494                         mac[2] = 0x4c;
 495                         mac[3] = 0x87;
 496                         mac[4] = 0x00;
 497                         mac[5] = 0x00;
 498                 }
 499                 if (r8712_initmac) {
 500                         /* Make sure the user did not select a multicast
 501                          * address by setting bit 1 of first octet.
 502                          */
 503                         mac[0] &= 0xFE;
 504                         printk(KERN_INFO "r8712u: MAC Address from user = "
 505                                "%pM\n", mac);
 506                 } else
 507                         printk(KERN_INFO "r8712u: MAC Address from efuse = "
 508                                "%pM\n", mac);
 509                 memcpy(pnetdev->dev_addr, mac, ETH_ALEN);
 510         }
 511         /* step 6. Tell the network stack we exist */
 512         if (register_netdev(pnetdev) != 0)
 513                 goto error;
 514         return 0;
 515 error:
 516         usb_put_dev(interface_to_usbdev(pusb_intf));
 517         usb_set_intfdata(pusb_intf, NULL);
 518         if (padapter->dvobj_deinit != NULL)
 519                 padapter->dvobj_deinit(padapter);
 520         if (pnetdev)
 521                 os_free_netdev(pnetdev);
 522         return -ENODEV;
 523 }
 524
 525 /* rmmod module & unplug(SurpriseRemoved) will call r871xu_dev_remove()
 526  * => how to recognize both */
 527 static void r871xu_dev_remove(struct usb_interface *pusb_intf)
 528 {
 529         struct net_device *pnetdev = usb_get_intfdata(pusb_intf);
 530         struct _adapter *padapter = (struct _adapter *)netdev_priv(pnetdev);
 531         struct usb_device *udev = interface_to_usbdev(pusb_intf);
 532
 533         if (padapter) {
 534                 if (drvpriv.drv_registered == true)
 535                         padapter->bSurpriseRemoved = true;
 536                 if (pnetdev != NULL) {
 537                         /* will call netdev_close() */
 538                         unregister_netdev(pnetdev);
 539                 }
 540                 flush_scheduled_work();
 541                 udelay(1);
 542                 r871x_dev_unload(padapter);
 543                 r8712_free_drv_sw(padapter);
 544         }
 545         usb_set_intfdata(pusb_intf, NULL);
 546         /* decrease the reference count of the usb device structure
 547          * when disconnect */
 548         usb_put_dev(udev);
 549         /* If we didn't unplug usb dongle and remove/insert modlue, driver
 550          * fails on sitesurvey for the first time when device is up.
 551          * Reset usb port for sitesurvey fail issue. */
 552         if (udev->state != USB_STATE_NOTATTACHED)
 553                 usb_reset_device(udev);
 554         return;
 555 }
 556
 557 static int __init r8712u_drv_entry(void)
 558 {
 559         drvpriv.drv_registered = true;
 560         return usb_register(&drvpriv.r871xu_drv);
 561 }
 562
 563 static void __exit r8712u_drv_halt(void)
 564 {
 565         drvpriv.drv_registered = false;
 566         usb_deregister(&drvpriv.r871xu_drv);
 567         printk(KERN_INFO "r8712u: Driver unloaded\n");
 568 }
 569
 570 module_init(r8712u_drv_entry);
 571 module_exit(r8712u_drv_halt);