drivers/net/wireless/realtek/rtlwifi/usb.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright(c) 2009-2012  Realtek Corporation.*/
   3
   4 #include "wifi.h"
   5 #include "core.h"
   6 #include "usb.h"
   7 #include "base.h"
   8 #include "ps.h"
   9 #include "rtl8192c/fw_common.h"
  10 #include <linux/export.h>
  11 #include <linux/module.h>
  12
  13 MODULE_AUTHOR("lizhaoming       <chaoming_li@realsil.com.cn>");
  14 MODULE_AUTHOR("Realtek WlanFAE  <wlanfae@realtek.com>");
  15 MODULE_AUTHOR("Larry Finger     <Larry.FInger@lwfinger.net>");
  16 MODULE_LICENSE("GPL");
  17 MODULE_DESCRIPTION("USB basic driver for rtlwifi");
  18
  19 #define REALTEK_USB_VENQT_READ                  0xC0
  20 #define REALTEK_USB_VENQT_WRITE                 0x40
  21 #define REALTEK_USB_VENQT_CMD_REQ               0x05
  22 #define REALTEK_USB_VENQT_CMD_IDX               0x00
  23
  24 #define MAX_USBCTRL_VENDORREQ_TIMES             10
  25
  26 static void usbctrl_async_callback(struct urb *urb)
  27 {
  28         if (urb) {
  29                 /* free dr */
  30                 kfree(urb->setup_packet);
  31                 /* free databuf */
  32                 kfree(urb->transfer_buffer);
  33         }
  34 }
  35
  36 static int _usbctrl_vendorreq_async_write(struct usb_device *udev, u8 request,
  37                                           u16 value, u16 index, void *pdata,
  38                                           u16 len)
  39 {
  40         int rc;
  41         unsigned int pipe;
  42         u8 reqtype;
  43         struct usb_ctrlrequest *dr;
  44         struct urb *urb;
  45         const u16 databuf_maxlen = REALTEK_USB_VENQT_MAX_BUF_SIZE;
  46         u8 *databuf;
  47
  48         if (WARN_ON_ONCE(len > databuf_maxlen))
  49                 len = databuf_maxlen;
  50
  51         pipe = usb_sndctrlpipe(udev, 0); /* write_out */
  52         reqtype =  REALTEK_USB_VENQT_WRITE;
  53
  54         dr = kzalloc(sizeof(*dr), GFP_ATOMIC);
  55         if (!dr)
  56                 return -ENOMEM;
  57
  58         databuf = kzalloc(databuf_maxlen, GFP_ATOMIC);
  59         if (!databuf) {
  60                 kfree(dr);
  61                 return -ENOMEM;
  62         }
  63
  64         urb = usb_alloc_urb(0, GFP_ATOMIC);
  65         if (!urb) {
  66                 kfree(databuf);
  67                 kfree(dr);
  68                 return -ENOMEM;
  69         }
  70
  71         dr->bRequestType = reqtype;
  72         dr->bRequest = request;
  73         dr->wValue = cpu_to_le16(value);
  74         dr->wIndex = cpu_to_le16(index);
  75         dr->wLength = cpu_to_le16(len);
  76         /* data are already in little-endian order */
  77         memcpy(databuf, pdata, len);
  78         usb_fill_control_urb(urb, udev, pipe,
  79                              (unsigned char *)dr, databuf, len,
  80                              usbctrl_async_callback, NULL);
  81         rc = usb_submit_urb(urb, GFP_ATOMIC);
  82         if (rc < 0) {
  83                 kfree(databuf);
  84                 kfree(dr);
  85         }
  86         usb_free_urb(urb);
  87         return rc;
  88 }
  89
  90 static int _usbctrl_vendorreq_sync_read(struct usb_device *udev, u8 request,
  91                                         u16 value, u16 index, void *pdata,
  92                                         u16 len)
  93 {
  94         unsigned int pipe;
  95         int status;
  96         u8 reqtype;
  97         int vendorreq_times = 0;
  98         static int count;
  99
 100         pipe = usb_rcvctrlpipe(udev, 0); /* read_in */
 101         reqtype =  REALTEK_USB_VENQT_READ;
 102
 103         do {
 104                 status = usb_control_msg(udev, pipe, request, reqtype, value,
 105                                          index, pdata, len, 1000);
 106                 if (status < 0) {
 107                         /* firmware download is checksumed, don't retry */
 108                         if ((value >= FW_8192C_START_ADDRESS &&
 109                             value <= FW_8192C_END_ADDRESS))
 110                                 break;
 111                 } else {
 112                         break;
 113                 }
 114         } while (++vendorreq_times < MAX_USBCTRL_VENDORREQ_TIMES);
 115
 116         if (status < 0 && count++ < 4)
 117                 pr_err("reg 0x%x, usbctrl_vendorreq TimeOut! status:0x%x value=0x%x\n",
 118                        value, status, *(u32 *)pdata);
 119         return status;
 120 }
 121
 122 static u32 _usb_read_sync(struct rtl_priv *rtlpriv, u32 addr, u16 len)
 123 {
 124         struct device *dev = rtlpriv->io.dev;
 125         struct usb_device *udev = to_usb_device(dev);
 126         u8 request;
 127         u16 wvalue;
 128         u16 index;
 129         __le32 *data;
 130         unsigned long flags;
 131
 132         spin_lock_irqsave(&rtlpriv->locks.usb_lock, flags);
 133         if (++rtlpriv->usb_data_index >= RTL_USB_MAX_RX_COUNT)
 134                 rtlpriv->usb_data_index = 0;
 135         data = &rtlpriv->usb_data[rtlpriv->usb_data_index];
 136         spin_unlock_irqrestore(&rtlpriv->locks.usb_lock, flags);
 137         request = REALTEK_USB_VENQT_CMD_REQ;
 138         index = REALTEK_USB_VENQT_CMD_IDX; /* n/a */
 139
 140         wvalue = (u16)addr;
 141         _usbctrl_vendorreq_sync_read(udev, request, wvalue, index, data, len);
 142         return le32_to_cpu(*data);
 143 }
 144
 145 static u8 _usb_read8_sync(struct rtl_priv *rtlpriv, u32 addr)
 146 {
 147         return (u8)_usb_read_sync(rtlpriv, addr, 1);
 148 }
 149
 150 static u16 _usb_read16_sync(struct rtl_priv *rtlpriv, u32 addr)
 151 {
 152         return (u16)_usb_read_sync(rtlpriv, addr, 2);
 153 }
 154
 155 static u32 _usb_read32_sync(struct rtl_priv *rtlpriv, u32 addr)
 156 {
 157         return _usb_read_sync(rtlpriv, addr, 4);
 158 }
 159
 160 static void _usb_write_async(struct usb_device *udev, u32 addr, u32 val,
 161                              u16 len)
 162 {
 163         u8 request;
 164         u16 wvalue;
 165         u16 index;
 166         __le32 data;
 167
 168         request = REALTEK_USB_VENQT_CMD_REQ;
 169         index = REALTEK_USB_VENQT_CMD_IDX; /* n/a */
 170         wvalue = (u16)(addr&0x0000ffff);
 171         data = cpu_to_le32(val);
 172         _usbctrl_vendorreq_async_write(udev, request, wvalue, index, &data,
 173                                        len);
 174 }
 175
 176 static void _usb_write8_async(struct rtl_priv *rtlpriv, u32 addr, u8 val)
 177 {
 178         struct device *dev = rtlpriv->io.dev;
 179
 180         _usb_write_async(to_usb_device(dev), addr, val, 1);
 181 }
 182
 183 static void _usb_write16_async(struct rtl_priv *rtlpriv, u32 addr, u16 val)
 184 {
 185         struct device *dev = rtlpriv->io.dev;
 186
 187         _usb_write_async(to_usb_device(dev), addr, val, 2);
 188 }
 189
 190 static void _usb_write32_async(struct rtl_priv *rtlpriv, u32 addr, u32 val)
 191 {
 192         struct device *dev = rtlpriv->io.dev;
 193
 194         _usb_write_async(to_usb_device(dev), addr, val, 4);
 195 }
 196
 197 static void _usb_writen_sync(struct rtl_priv *rtlpriv, u32 addr, void *data,
 198                              u16 len)
 199 {
 200         struct device *dev = rtlpriv->io.dev;
 201         struct usb_device *udev = to_usb_device(dev);
 202         u8 request = REALTEK_USB_VENQT_CMD_REQ;
 203         u8 reqtype =  REALTEK_USB_VENQT_WRITE;
 204         u16 wvalue;
 205         u16 index = REALTEK_USB_VENQT_CMD_IDX;
 206         int pipe = usb_sndctrlpipe(udev, 0); /* write_out */
 207         u8 *buffer;
 208
 209         wvalue = (u16)(addr & 0x0000ffff);
 210         buffer = kmemdup(data, len, GFP_ATOMIC);
 211         if (!buffer)
 212                 return;
 213         usb_control_msg(udev, pipe, request, reqtype, wvalue,
 214                         index, buffer, len, 50);
 215
 216         kfree(buffer);
 217 }
 218
 219 static void _rtl_usb_io_handler_init(struct device *dev,
 220                                      struct ieee80211_hw *hw)
 221 {
 222         struct rtl_priv *rtlpriv = rtl_priv(hw);
 223
 224         rtlpriv->io.dev = dev;
 225         mutex_init(&rtlpriv->io.bb_mutex);
 226         rtlpriv->io.write8_async        = _usb_write8_async;
 227         rtlpriv->io.write16_async       = _usb_write16_async;
 228         rtlpriv->io.write32_async       = _usb_write32_async;
 229         rtlpriv->io.read8_sync          = _usb_read8_sync;
 230         rtlpriv->io.read16_sync         = _usb_read16_sync;
 231         rtlpriv->io.read32_sync         = _usb_read32_sync;
 232         rtlpriv->io.writen_sync         = _usb_writen_sync;
 233 }
 234
 235 static void _rtl_usb_io_handler_release(struct ieee80211_hw *hw)
 236 {
 237         struct rtl_priv __maybe_unused *rtlpriv = rtl_priv(hw);
 238
 239         mutex_destroy(&rtlpriv->io.bb_mutex);
 240 }
 241
 242 /*      Default aggregation handler. Do nothing and just return the oldest skb.  */
 243 static struct sk_buff *_none_usb_tx_aggregate_hdl(struct ieee80211_hw *hw,
 244                                                   struct sk_buff_head *list)
 245 {
 246         return skb_dequeue(list);
 247 }
 248
 249 #define IS_HIGH_SPEED_USB(udev) \
 250                 ((USB_SPEED_HIGH == (udev)->speed) ? true : false)
 251
 252 static int _rtl_usb_init_tx(struct ieee80211_hw *hw)
 253 {
 254         u32 i;
 255         struct rtl_priv *rtlpriv = rtl_priv(hw);
 256         struct rtl_usb *rtlusb = rtl_usbdev(rtl_usbpriv(hw));
 257
 258         rtlusb->max_bulk_out_size = IS_HIGH_SPEED_USB(rtlusb->udev)
 259                                                     ? USB_HIGH_SPEED_BULK_SIZE
 260                                                     : USB_FULL_SPEED_BULK_SIZE;
 261
 262         RT_TRACE(rtlpriv, COMP_INIT, DBG_DMESG, "USB Max Bulk-out Size=%d\n",
 263                  rtlusb->max_bulk_out_size);
 264
 265         for (i = 0; i < __RTL_TXQ_NUM; i++) {
 266                 u32 ep_num = rtlusb->ep_map.ep_mapping[i];
 267
 268                 if (!ep_num) {
 269                         RT_TRACE(rtlpriv, COMP_INIT, DBG_DMESG,
 270                                  "Invalid endpoint map setting!\n");
 271                         return -EINVAL;
 272                 }
 273         }
 274
 275         rtlusb->usb_tx_post_hdl =
 276                  rtlpriv->cfg->usb_interface_cfg->usb_tx_post_hdl;
 277         rtlusb->usb_tx_cleanup  =
 278                  rtlpriv->cfg->usb_interface_cfg->usb_tx_cleanup;
 279         rtlusb->usb_tx_aggregate_hdl =
 280                  (rtlpriv->cfg->usb_interface_cfg->usb_tx_aggregate_hdl)
 281                  ? rtlpriv->cfg->usb_interface_cfg->usb_tx_aggregate_hdl
 282                  : &_none_usb_tx_aggregate_hdl;
 283
 284         init_usb_anchor(&rtlusb->tx_submitted);
 285         for (i = 0; i < RTL_USB_MAX_EP_NUM; i++) {
 286                 skb_queue_head_init(&rtlusb->tx_skb_queue[i]);
 287                 init_usb_anchor(&rtlusb->tx_pending[i]);
 288         }
 289         return 0;
 290 }
 291
 292 static void _rtl_rx_work(unsigned long param);
 293
 294 static int _rtl_usb_init_rx(struct ieee80211_hw *hw)
 295 {
 296         struct rtl_priv *rtlpriv = rtl_priv(hw);
 297         struct rtl_usb_priv *usb_priv = rtl_usbpriv(hw);
 298         struct rtl_usb *rtlusb = rtl_usbdev(usb_priv);
 299
 300         rtlusb->rx_max_size = rtlpriv->cfg->usb_interface_cfg->rx_max_size;
 301         rtlusb->rx_urb_num = rtlpriv->cfg->usb_interface_cfg->rx_urb_num;
 302         rtlusb->in_ep = rtlpriv->cfg->usb_interface_cfg->in_ep_num;
 303         rtlusb->usb_rx_hdl = rtlpriv->cfg->usb_interface_cfg->usb_rx_hdl;
 304         rtlusb->usb_rx_segregate_hdl =
 305                 rtlpriv->cfg->usb_interface_cfg->usb_rx_segregate_hdl;
 306
 307         pr_info("rx_max_size %d, rx_urb_num %d, in_ep %d\n",
 308                 rtlusb->rx_max_size, rtlusb->rx_urb_num, rtlusb->in_ep);
 309         init_usb_anchor(&rtlusb->rx_submitted);
 310         init_usb_anchor(&rtlusb->rx_cleanup_urbs);
 311
 312         skb_queue_head_init(&rtlusb->rx_queue);
 313         rtlusb->rx_work_tasklet.func = _rtl_rx_work;
 314         rtlusb->rx_work_tasklet.data = (unsigned long)rtlusb;
 315
 316         return 0;
 317 }
 318
 319 static int _rtl_usb_init(struct ieee80211_hw *hw)
 320 {
 321         struct rtl_priv *rtlpriv = rtl_priv(hw);
 322         struct rtl_usb_priv *usb_priv = rtl_usbpriv(hw);
 323         struct rtl_usb *rtlusb = rtl_usbdev(usb_priv);
 324         int err;
 325         u8 epidx;
 326         struct usb_interface    *usb_intf = rtlusb->intf;
 327         u8 epnums = usb_intf->cur_altsetting->desc.bNumEndpoints;
 328
 329         rtlusb->out_ep_nums = rtlusb->in_ep_nums = 0;
 330         for (epidx = 0; epidx < epnums; epidx++) {
 331                 struct usb_endpoint_descriptor *pep_desc;
 332
 333                 pep_desc = &usb_intf->cur_altsetting->endpoint[epidx].desc;
 334
 335                 if (usb_endpoint_dir_in(pep_desc))
 336                         rtlusb->in_ep_nums++;
 337                 else if (usb_endpoint_dir_out(pep_desc))
 338                         rtlusb->out_ep_nums++;
 339
 340                 RT_TRACE(rtlpriv, COMP_INIT, DBG_DMESG,
 341                          "USB EP(0x%02x), MaxPacketSize=%d, Interval=%d\n",
 342                          pep_desc->bEndpointAddress, pep_desc->wMaxPacketSize,
 343                          pep_desc->bInterval);
 344         }
 345         if (rtlusb->in_ep_nums <  rtlpriv->cfg->usb_interface_cfg->in_ep_num) {
 346                 pr_err("Too few input end points found\n");
 347                 return -EINVAL;
 348         }
 349         if (rtlusb->out_ep_nums == 0) {
 350                 pr_err("No output end points found\n");
 351                 return -EINVAL;
 352         }
 353         /* usb endpoint mapping */
 354         err = rtlpriv->cfg->usb_interface_cfg->usb_endpoint_mapping(hw);
 355         rtlusb->usb_mq_to_hwq =  rtlpriv->cfg->usb_interface_cfg->usb_mq_to_hwq;
 356         _rtl_usb_init_tx(hw);
 357         _rtl_usb_init_rx(hw);
 358         return err;
 359 }
 360
 361 static void rtl_usb_init_sw(struct ieee80211_hw *hw)
 362 {
 363         struct rtl_mac *mac = rtl_mac(rtl_priv(hw));
 364         struct rtl_hal *rtlhal = rtl_hal(rtl_priv(hw));
 365         struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
 366         struct rtl_usb *rtlusb = rtl_usbdev(rtl_usbpriv(hw));
 367
 368         rtlhal->hw = hw;
 369         ppsc->inactiveps = false;
 370         ppsc->leisure_ps = false;
 371         ppsc->fwctrl_lps = false;
 372         ppsc->reg_fwctrl_lps = 3;
 373         ppsc->reg_max_lps_awakeintvl = 5;
 374         ppsc->fwctrl_psmode = FW_PS_DTIM_MODE;
 375
 376          /* IBSS */
 377         mac->beacon_interval = 100;
 378
 379          /* AMPDU */
 380         mac->min_space_cfg = 0;
 381         mac->max_mss_density = 0;
 382
 383         /* set sane AMPDU defaults */
 384         mac->current_ampdu_density = 7;
 385         mac->current_ampdu_factor = 3;
 386
 387         /* QOS */
 388         rtlusb->acm_method = EACMWAY2_SW;
 389
 390         /* IRQ */
 391         /* HIMR - turn all on */
 392         rtlusb->irq_mask[0] = 0xFFFFFFFF;
 393         /* HIMR_EX - turn all on */
 394         rtlusb->irq_mask[1] = 0xFFFFFFFF;
 395         rtlusb->disablehwsm =  true;
 396 }
 397
 398 static void _rtl_rx_completed(struct urb *urb);
 399
 400 static int _rtl_prep_rx_urb(struct ieee80211_hw *hw, struct rtl_usb *rtlusb,
 401                               struct urb *urb, gfp_t gfp_mask)
 402 {
 403         void *buf;
 404
 405         buf = usb_alloc_coherent(rtlusb->udev, rtlusb->rx_max_size, gfp_mask,
 406                                  &urb->transfer_dma);
 407         if (!buf) {
 408                 pr_err("Failed to usb_alloc_coherent!!\n");
 409                 return -ENOMEM;
 410         }
 411
 412         usb_fill_bulk_urb(urb, rtlusb->udev,
 413                           usb_rcvbulkpipe(rtlusb->udev, rtlusb->in_ep),
 414                           buf, rtlusb->rx_max_size, _rtl_rx_completed, rtlusb);
 415         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 416
 417         return 0;
 418 }
 419
 420 static void _rtl_usb_rx_process_agg(struct ieee80211_hw *hw,
 421                                     struct sk_buff *skb)
 422 {
 423         struct rtl_priv *rtlpriv = rtl_priv(hw);
 424         u8 *rxdesc = skb->data;
 425         struct ieee80211_hdr *hdr;
 426         bool unicast = false;
 427         __le16 fc;
 428         struct ieee80211_rx_status rx_status = {0};
 429         struct rtl_stats stats = {
 430                 .signal = 0,
 431                 .rate = 0,
 432         };
 433
 434         skb_pull(skb, RTL_RX_DESC_SIZE);
 435         rtlpriv->cfg->ops->query_rx_desc(hw, &stats, &rx_status, rxdesc, skb);
 436         skb_pull(skb, (stats.rx_drvinfo_size + stats.rx_bufshift));
 437         hdr = (struct ieee80211_hdr *)(skb->data);
 438         fc = hdr->frame_control;
 439         if (!stats.crc) {
 440                 memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
 441
 442                 if (is_broadcast_ether_addr(hdr->addr1)) {
 443                         /*TODO*/;
 444                 } else if (is_multicast_ether_addr(hdr->addr1)) {
 445                         /*TODO*/
 446                 } else {
 447                         unicast = true;
 448                         rtlpriv->stats.rxbytesunicast +=  skb->len;
 449                 }
 450
 451                 if (ieee80211_is_data(fc)) {
 452                         rtlpriv->cfg->ops->led_control(hw, LED_CTL_RX);
 453
 454                         if (unicast)
 455                                 rtlpriv->link_info.num_rx_inperiod++;
 456                 }
 457                 /* static bcn for roaming */
 458                 rtl_beacon_statistic(hw, skb);
 459         }
 460 }
 461
 462 static void _rtl_usb_rx_process_noagg(struct ieee80211_hw *hw,
 463                                       struct sk_buff *skb)
 464 {
 465         struct rtl_priv *rtlpriv = rtl_priv(hw);
 466         u8 *rxdesc = skb->data;
 467         struct ieee80211_hdr *hdr;
 468         bool unicast = false;
 469         __le16 fc;
 470         struct ieee80211_rx_status rx_status = {0};
 471         struct rtl_stats stats = {
 472                 .signal = 0,
 473                 .rate = 0,
 474         };
 475
 476         skb_pull(skb, RTL_RX_DESC_SIZE);
 477         rtlpriv->cfg->ops->query_rx_desc(hw, &stats, &rx_status, rxdesc, skb);
 478         skb_pull(skb, (stats.rx_drvinfo_size + stats.rx_bufshift));
 479         hdr = (struct ieee80211_hdr *)(skb->data);
 480         fc = hdr->frame_control;
 481         if (!stats.crc) {
 482                 memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
 483
 484                 if (is_broadcast_ether_addr(hdr->addr1)) {
 485                         /*TODO*/;
 486                 } else if (is_multicast_ether_addr(hdr->addr1)) {
 487                         /*TODO*/
 488                 } else {
 489                         unicast = true;
 490                         rtlpriv->stats.rxbytesunicast +=  skb->len;
 491                 }
 492
 493                 if (ieee80211_is_data(fc)) {
 494                         rtlpriv->cfg->ops->led_control(hw, LED_CTL_RX);
 495
 496                         if (unicast)
 497                                 rtlpriv->link_info.num_rx_inperiod++;
 498                 }
 499
 500                 /* static bcn for roaming */
 501                 rtl_beacon_statistic(hw, skb);
 502
 503                 if (likely(rtl_action_proc(hw, skb, false)))
 504                         ieee80211_rx(hw, skb);
 505                 else
 506                         dev_kfree_skb_any(skb);
 507         } else {
 508                 dev_kfree_skb_any(skb);
 509         }
 510 }
 511
 512 static void _rtl_rx_pre_process(struct ieee80211_hw *hw, struct sk_buff *skb)
 513 {
 514         struct sk_buff *_skb;
 515         struct sk_buff_head rx_queue;
 516         struct rtl_usb *rtlusb = rtl_usbdev(rtl_usbpriv(hw));
 517
 518         skb_queue_head_init(&rx_queue);
 519         if (rtlusb->usb_rx_segregate_hdl)
 520                 rtlusb->usb_rx_segregate_hdl(hw, skb, &rx_queue);
 521         WARN_ON(skb_queue_empty(&rx_queue));
 522         while (!skb_queue_empty(&rx_queue)) {
 523                 _skb = skb_dequeue(&rx_queue);
 524                 _rtl_usb_rx_process_agg(hw, _skb);
 525                 ieee80211_rx(hw, _skb);
 526         }
 527 }
 528
 529 #define __RX_SKB_MAX_QUEUED     64
 530
 531 static void _rtl_rx_work(unsigned long param)
 532 {
 533         struct rtl_usb *rtlusb = (struct rtl_usb *)param;
 534         struct ieee80211_hw *hw = usb_get_intfdata(rtlusb->intf);
 535         struct sk_buff *skb;
 536
 537         while ((skb = skb_dequeue(&rtlusb->rx_queue))) {
 538                 if (unlikely(IS_USB_STOP(rtlusb))) {
 539                         dev_kfree_skb_any(skb);
 540                         continue;
 541                 }
 542
 543                 if (likely(!rtlusb->usb_rx_segregate_hdl)) {
 544                         _rtl_usb_rx_process_noagg(hw, skb);
 545                 } else {
 546                         /* TO DO */
 547                         _rtl_rx_pre_process(hw, skb);
 548                         pr_err("rx agg not supported\n");
 549                 }
 550         }
 551 }
 552
 553 static unsigned int _rtl_rx_get_padding(struct ieee80211_hdr *hdr,
 554                                         unsigned int len)
 555 {
 556 #if NET_IP_ALIGN != 0
 557         unsigned int padding = 0;
 558 #endif
 559
 560         /* make function no-op when possible */
 561         if (NET_IP_ALIGN == 0 || len < sizeof(*hdr))
 562                 return 0;
 563
 564 #if NET_IP_ALIGN != 0
 565         /* alignment calculation as in lbtf_rx() / carl9170_rx_copy_data() */
 566         /* TODO: deduplicate common code, define helper function instead? */
 567
 568         if (ieee80211_is_data_qos(hdr->frame_control)) {
 569                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 570
 571                 padding ^= NET_IP_ALIGN;
 572
 573                 /* Input might be invalid, avoid accessing memory outside
 574                  * the buffer.
 575                  */
 576                 if ((unsigned long)qc - (unsigned long)hdr < len &&
 577                     *qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 578                         padding ^= NET_IP_ALIGN;
 579         }
 580
 581         if (ieee80211_has_a4(hdr->frame_control))
 582                 padding ^= NET_IP_ALIGN;
 583
 584         return padding;
 585 #endif
 586 }
 587
 588 #define __RADIO_TAP_SIZE_RSV    32
 589
 590 static void _rtl_rx_completed(struct urb *_urb)
 591 {
 592         struct rtl_usb *rtlusb = (struct rtl_usb *)_urb->context;
 593         int err = 0;
 594
 595         if (unlikely(IS_USB_STOP(rtlusb)))
 596                 goto free;
 597
 598         if (likely(0 == _urb->status)) {
 599                 unsigned int padding;
 600                 struct sk_buff *skb;
 601                 unsigned int qlen;
 602                 unsigned int size = _urb->actual_length;
 603                 struct ieee80211_hdr *hdr;
 604
 605                 if (size < RTL_RX_DESC_SIZE + sizeof(struct ieee80211_hdr)) {
 606                         pr_err("Too short packet from bulk IN! (len: %d)\n",
 607                                size);
 608                         goto resubmit;
 609                 }
 610
 611                 qlen = skb_queue_len(&rtlusb->rx_queue);
 612                 if (qlen >= __RX_SKB_MAX_QUEUED) {
 613                         pr_err("Pending RX skbuff queue full! (qlen: %d)\n",
 614                                qlen);
 615                         goto resubmit;
 616                 }
 617
 618                 hdr = (void *)(_urb->transfer_buffer + RTL_RX_DESC_SIZE);
 619                 padding = _rtl_rx_get_padding(hdr, size - RTL_RX_DESC_SIZE);
 620
 621                 skb = dev_alloc_skb(size + __RADIO_TAP_SIZE_RSV + padding);
 622                 if (!skb) {
 623                         pr_err("Can't allocate skb for bulk IN!\n");
 624                         goto resubmit;
 625                 }
 626
 627                 _rtl_install_trx_info(rtlusb, skb, rtlusb->in_ep);
 628
 629                 /* Make sure the payload data is 4 byte aligned. */
 630                 skb_reserve(skb, padding);
 631
 632                 /* reserve some space for mac80211's radiotap */
 633                 skb_reserve(skb, __RADIO_TAP_SIZE_RSV);
 634
 635                 skb_put_data(skb, _urb->transfer_buffer, size);
 636
 637                 skb_queue_tail(&rtlusb->rx_queue, skb);
 638                 tasklet_schedule(&rtlusb->rx_work_tasklet);
 639
 640                 goto resubmit;
 641         }
 642
 643         switch (_urb->status) {
 644         /* disconnect */
 645         case -ENOENT:
 646         case -ECONNRESET:
 647         case -ENODEV:
 648         case -ESHUTDOWN:
 649                 goto free;
 650         default:
 651                 break;
 652         }
 653
 654 resubmit:
 655         usb_anchor_urb(_urb, &rtlusb->rx_submitted);
 656         err = usb_submit_urb(_urb, GFP_ATOMIC);
 657         if (unlikely(err)) {
 658                 usb_unanchor_urb(_urb);
 659                 goto free;
 660         }
 661         return;
 662
 663 free:
 664         /* On some architectures, usb_free_coherent must not be called from
 665          * hardirq context. Queue urb to cleanup list.
 666          */
 667         usb_anchor_urb(_urb, &rtlusb->rx_cleanup_urbs);
 668 }
 669
 670 #undef __RADIO_TAP_SIZE_RSV
 671
 672 static void _rtl_usb_cleanup_rx(struct ieee80211_hw *hw)
 673 {
 674         struct rtl_priv *rtlpriv = rtl_priv(hw);
 675         struct rtl_usb *rtlusb = rtl_usbdev(rtl_usbpriv(hw));
 676         struct urb *urb;
 677
 678         usb_kill_anchored_urbs(&rtlusb->rx_submitted);
 679
 680         tasklet_kill(&rtlusb->rx_work_tasklet);
 681         cancel_work_sync(&rtlpriv->works.lps_change_work);
 682
 683         if (rtlpriv->works.rtl_wq) {
 684                 destroy_workqueue(rtlpriv->works.rtl_wq);
 685                 rtlpriv->works.rtl_wq = NULL;
 686         }
 687
 688         skb_queue_purge(&rtlusb->rx_queue);
 689
 690         while ((urb = usb_get_from_anchor(&rtlusb->rx_cleanup_urbs))) {
 691                 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
 692                                 urb->transfer_buffer, urb->transfer_dma);
 693                 usb_free_urb(urb);
 694         }
 695 }
 696
 697 static int _rtl_usb_receive(struct ieee80211_hw *hw)
 698 {
 699         struct urb *urb;
 700         int err;
 701         int i;
 702         struct rtl_usb *rtlusb = rtl_usbdev(rtl_usbpriv(hw));
 703
 704         WARN_ON(0 == rtlusb->rx_urb_num);
 705         /* 1600 == 1514 + max WLAN header + rtk info */
 706         WARN_ON(rtlusb->rx_max_size < 1600);
 707
 708         for (i = 0; i < rtlusb->rx_urb_num; i++) {
 709                 err = -ENOMEM;
 710                 urb = usb_alloc_urb(0, GFP_KERNEL);
 711                 if (!urb)
 712                         goto err_out;
 713
 714                 err = _rtl_prep_rx_urb(hw, rtlusb, urb, GFP_KERNEL);
 715                 if (err < 0) {
 716                         pr_err("Failed to prep_rx_urb!!\n");
 717                         usb_free_urb(urb);
 718                         goto err_out;
 719                 }
 720
 721                 usb_anchor_urb(urb, &rtlusb->rx_submitted);
 722                 err = usb_submit_urb(urb, GFP_KERNEL);
 723                 if (err) {
 724                         usb_unanchor_urb(urb);
 725                         usb_free_urb(urb);
 726                         goto err_out;
 727                 }
 728                 usb_free_urb(urb);
 729         }
 730         return 0;
 731
 732 err_out:
 733         usb_kill_anchored_urbs(&rtlusb->rx_submitted);
 734         _rtl_usb_cleanup_rx(hw);
 735         return err;
 736 }
 737
 738 static int rtl_usb_start(struct ieee80211_hw *hw)
 739 {
 740         int err;
 741         struct rtl_priv *rtlpriv = rtl_priv(hw);
 742         struct rtl_hal *rtlhal = rtl_hal(rtl_priv(hw));
 743         struct rtl_usb *rtlusb = rtl_usbdev(rtl_usbpriv(hw));
 744
 745         err = rtlpriv->cfg->ops->hw_init(hw);
 746         if (!err) {
 747                 rtl_init_rx_config(hw);
 748
 749                 /* Enable software */
 750                 SET_USB_START(rtlusb);
 751                 /* should after adapter start and interrupt enable. */
 752                 set_hal_start(rtlhal);
 753
 754                 /* Start bulk IN */
 755                 err = _rtl_usb_receive(hw);
 756         }
 757
 758         return err;
 759 }
 760
 761 /*=======================  tx =========================================*/
 762 static void rtl_usb_cleanup(struct ieee80211_hw *hw)
 763 {
 764         u32 i;
 765         struct sk_buff *_skb;
 766         struct rtl_usb *rtlusb = rtl_usbdev(rtl_usbpriv(hw));
 767         struct ieee80211_tx_info *txinfo;
 768
 769         /* clean up rx stuff. */
 770         _rtl_usb_cleanup_rx(hw);
 771
 772         /* clean up tx stuff */
 773         for (i = 0; i < RTL_USB_MAX_EP_NUM; i++) {
 774                 while ((_skb = skb_dequeue(&rtlusb->tx_skb_queue[i]))) {
 775                         rtlusb->usb_tx_cleanup(hw, _skb);
 776                         txinfo = IEEE80211_SKB_CB(_skb);
 777                         ieee80211_tx_info_clear_status(txinfo);
 778                         txinfo->flags |= IEEE80211_TX_STAT_ACK;
 779                         ieee80211_tx_status_irqsafe(hw, _skb);
 780                 }
 781                 usb_kill_anchored_urbs(&rtlusb->tx_pending[i]);
 782         }
 783         usb_kill_anchored_urbs(&rtlusb->tx_submitted);
 784 }
 785
 786 /* We may add some struct into struct rtl_usb later. Do deinit here.  */
 787 static void rtl_usb_deinit(struct ieee80211_hw *hw)
 788 {
 789         rtl_usb_cleanup(hw);
 790 }
 791
 792 static void rtl_usb_stop(struct ieee80211_hw *hw)
 793 {
 794         struct rtl_priv *rtlpriv = rtl_priv(hw);
 795         struct rtl_hal *rtlhal = rtl_hal(rtl_priv(hw));
 796         struct rtl_usb *rtlusb = rtl_usbdev(rtl_usbpriv(hw));
 797         struct urb *urb;
 798
 799         /* should after adapter start and interrupt enable. */
 800         set_hal_stop(rtlhal);
 801         cancel_work_sync(&rtlpriv->works.fill_h2c_cmd);
 802         /* Enable software */
 803         SET_USB_STOP(rtlusb);
 804
 805         /* free pre-allocated URBs from rtl_usb_start() */
 806         usb_kill_anchored_urbs(&rtlusb->rx_submitted);
 807
 808         tasklet_kill(&rtlusb->rx_work_tasklet);
 809         cancel_work_sync(&rtlpriv->works.lps_change_work);
 810
 811         flush_workqueue(rtlpriv->works.rtl_wq);
 812
 813         skb_queue_purge(&rtlusb->rx_queue);
 814
 815         while ((urb = usb_get_from_anchor(&rtlusb->rx_cleanup_urbs))) {
 816                 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
 817                                 urb->transfer_buffer, urb->transfer_dma);
 818                 usb_free_urb(urb);
 819         }
 820
 821         rtlpriv->cfg->ops->hw_disable(hw);
 822 }
 823
 824 static void _rtl_submit_tx_urb(struct ieee80211_hw *hw, struct urb *_urb)
 825 {
 826         int err;
 827         struct rtl_usb *rtlusb = rtl_usbdev(rtl_usbpriv(hw));
 828
 829         usb_anchor_urb(_urb, &rtlusb->tx_submitted);
 830         err = usb_submit_urb(_urb, GFP_ATOMIC);
 831         if (err < 0) {
 832                 struct sk_buff *skb;
 833
 834                 pr_err("Failed to submit urb\n");
 835                 usb_unanchor_urb(_urb);
 836                 skb = (struct sk_buff *)_urb->context;
 837                 kfree_skb(skb);
 838         }
 839         usb_free_urb(_urb);
 840 }
 841
 842 static int _usb_tx_post(struct ieee80211_hw *hw, struct urb *urb,
 843                         struct sk_buff *skb)
 844 {
 845         struct rtl_usb *rtlusb = rtl_usbdev(rtl_usbpriv(hw));
 846         struct ieee80211_tx_info *txinfo;
 847
 848         rtlusb->usb_tx_post_hdl(hw, urb, skb);
 849         skb_pull(skb, RTL_TX_HEADER_SIZE);
 850         txinfo = IEEE80211_SKB_CB(skb);
 851         ieee80211_tx_info_clear_status(txinfo);
 852         txinfo->flags |= IEEE80211_TX_STAT_ACK;
 853
 854         if (urb->status) {
 855                 pr_err("Urb has error status 0x%X\n", urb->status);
 856                 goto out;
 857         }
 858         /*  TODO:       statistics */
 859 out:
 860         ieee80211_tx_status_irqsafe(hw, skb);
 861         return urb->status;
 862 }
 863
 864 static void _rtl_tx_complete(struct urb *urb)
 865 {
 866         struct sk_buff *skb = (struct sk_buff *)urb->context;
 867         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 868         struct rtl_usb *rtlusb = (struct rtl_usb *)info->rate_driver_data[0];
 869         struct ieee80211_hw *hw = usb_get_intfdata(rtlusb->intf);
 870         int err;
 871
 872         if (unlikely(IS_USB_STOP(rtlusb)))
 873                 return;
 874         err = _usb_tx_post(hw, urb, skb);
 875         if (err) {
 876                 /* Ignore error and keep issuiing other urbs */
 877                 return;
 878         }
 879 }
 880
 881 static struct urb *_rtl_usb_tx_urb_setup(struct ieee80211_hw *hw,
 882                                 struct sk_buff *skb, u32 ep_num)
 883 {
 884         struct rtl_usb *rtlusb = rtl_usbdev(rtl_usbpriv(hw));
 885         struct urb *_urb;
 886
 887         WARN_ON(NULL == skb);
 888         _urb = usb_alloc_urb(0, GFP_ATOMIC);
 889         if (!_urb)
 890                 return NULL;
 891         _rtl_install_trx_info(rtlusb, skb, ep_num);
 892         usb_fill_bulk_urb(_urb, rtlusb->udev, usb_sndbulkpipe(rtlusb->udev,
 893                           ep_num), skb->data, skb->len, _rtl_tx_complete, skb);
 894         _urb->transfer_flags |= URB_ZERO_PACKET;
 895         return _urb;
 896 }
 897
 898 static void _rtl_usb_transmit(struct ieee80211_hw *hw, struct sk_buff *skb,
 899                        enum rtl_txq qnum)
 900 {
 901         struct rtl_usb *rtlusb = rtl_usbdev(rtl_usbpriv(hw));
 902         u32 ep_num;
 903         struct urb *_urb = NULL;
 904
 905         WARN_ON(NULL == rtlusb->usb_tx_aggregate_hdl);
 906         if (unlikely(IS_USB_STOP(rtlusb))) {
 907                 pr_err("USB device is stopping...\n");
 908                 kfree_skb(skb);
 909                 return;
 910         }
 911         ep_num = rtlusb->ep_map.ep_mapping[qnum];
 912         _urb = _rtl_usb_tx_urb_setup(hw, skb, ep_num);
 913         if (unlikely(!_urb)) {
 914                 pr_err("Can't allocate urb. Drop skb!\n");
 915                 kfree_skb(skb);
 916                 return;
 917         }
 918         _rtl_submit_tx_urb(hw, _urb);
 919 }
 920
 921 static void _rtl_usb_tx_preprocess(struct ieee80211_hw *hw,
 922                                    struct ieee80211_sta *sta,
 923                                    struct sk_buff *skb,
 924                                    u16 hw_queue)
 925 {
 926         struct rtl_priv *rtlpriv = rtl_priv(hw);
 927         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 928         struct rtl_tx_desc *pdesc = NULL;
 929         struct rtl_tcb_desc tcb_desc;
 930         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
 931         __le16 fc = hdr->frame_control;
 932         u8 *pda_addr = hdr->addr1;
 933
 934         memset(&tcb_desc, 0, sizeof(struct rtl_tcb_desc));
 935         if (ieee80211_is_auth(fc)) {
 936                 RT_TRACE(rtlpriv, COMP_SEND, DBG_DMESG, "MAC80211_LINKING\n");
 937         }
 938
 939         if (rtlpriv->psc.sw_ps_enabled) {
 940                 if (ieee80211_is_data(fc) && !ieee80211_is_nullfunc(fc) &&
 941                     !ieee80211_has_pm(fc))
 942                         hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 943         }
 944
 945         rtl_action_proc(hw, skb, true);
 946         if (is_multicast_ether_addr(pda_addr))
 947                 rtlpriv->stats.txbytesmulticast += skb->len;
 948         else if (is_broadcast_ether_addr(pda_addr))
 949                 rtlpriv->stats.txbytesbroadcast += skb->len;
 950         else
 951                 rtlpriv->stats.txbytesunicast += skb->len;
 952         rtlpriv->cfg->ops->fill_tx_desc(hw, hdr, (u8 *)pdesc, NULL, info, sta, skb,
 953                                         hw_queue, &tcb_desc);
 954         if (ieee80211_is_data(fc))
 955                 rtlpriv->cfg->ops->led_control(hw, LED_CTL_TX);
 956 }
 957
 958 static int rtl_usb_tx(struct ieee80211_hw *hw,
 959                       struct ieee80211_sta *sta,
 960                       struct sk_buff *skb,
 961                       struct rtl_tcb_desc *dummy)
 962 {
 963         struct rtl_usb *rtlusb = rtl_usbdev(rtl_usbpriv(hw));
 964         struct rtl_hal *rtlhal = rtl_hal(rtl_priv(hw));
 965         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
 966         __le16 fc = hdr->frame_control;
 967         u16 hw_queue;
 968
 969         if (unlikely(is_hal_stop(rtlhal)))
 970                 goto err_free;
 971         hw_queue = rtlusb->usb_mq_to_hwq(fc, skb_get_queue_mapping(skb));
 972         _rtl_usb_tx_preprocess(hw, sta, skb, hw_queue);
 973         _rtl_usb_transmit(hw, skb, hw_queue);
 974         return NETDEV_TX_OK;
 975
 976 err_free:
 977         dev_kfree_skb_any(skb);
 978         return NETDEV_TX_OK;
 979 }
 980
 981 static bool rtl_usb_tx_chk_waitq_insert(struct ieee80211_hw *hw,
 982                                         struct ieee80211_sta *sta,
 983                                         struct sk_buff *skb)
 984 {
 985         return false;
 986 }
 987
 988 static void rtl_fill_h2c_cmd_work_callback(struct work_struct *work)
 989 {
 990         struct rtl_works *rtlworks =
 991             container_of(work, struct rtl_works, fill_h2c_cmd);
 992         struct ieee80211_hw *hw = rtlworks->hw;
 993         struct rtl_priv *rtlpriv = rtl_priv(hw);
 994
 995         rtlpriv->cfg->ops->fill_h2c_cmd(hw, H2C_RA_MASK, 5, rtlpriv->rate_mask);
 996 }
 997
 998 static const struct rtl_intf_ops rtl_usb_ops = {
 999         .adapter_start = rtl_usb_start,
1000         .adapter_stop = rtl_usb_stop,
1001         .adapter_tx = rtl_usb_tx,
1002         .waitq_insert = rtl_usb_tx_chk_waitq_insert,
1003 };
1004
1005 int rtl_usb_probe(struct usb_interface *intf,
1006                   const struct usb_device_id *id,
1007                   struct rtl_hal_cfg *rtl_hal_cfg)
1008 {
1009         int err;
1010         struct ieee80211_hw *hw = NULL;
1011         struct rtl_priv *rtlpriv = NULL;
1012         struct usb_device       *udev;
1013         struct rtl_usb_priv *usb_priv;
1014
1015         hw = ieee80211_alloc_hw(sizeof(struct rtl_priv) +
1016                                 sizeof(struct rtl_usb_priv), &rtl_ops);
1017         if (!hw) {
1018                 WARN_ONCE(true, "rtl_usb: ieee80211 alloc failed\n");
1019                 return -ENOMEM;
1020         }
1021         rtlpriv = hw->priv;
1022         rtlpriv->hw = hw;
1023         rtlpriv->usb_data = kcalloc(RTL_USB_MAX_RX_COUNT, sizeof(u32),
1024                                     GFP_KERNEL);
1025         if (!rtlpriv->usb_data) {
1026                 ieee80211_free_hw(hw);
1027                 return -ENOMEM;
1028         }
1029
1030         /* this spin lock must be initialized early */
1031         spin_lock_init(&rtlpriv->locks.usb_lock);
1032         INIT_WORK(&rtlpriv->works.fill_h2c_cmd,
1033                   rtl_fill_h2c_cmd_work_callback);
1034         INIT_WORK(&rtlpriv->works.lps_change_work,
1035                   rtl_lps_change_work_callback);
1036
1037         rtlpriv->usb_data_index = 0;
1038         init_completion(&rtlpriv->firmware_loading_complete);
1039         SET_IEEE80211_DEV(hw, &intf->dev);
1040         udev = interface_to_usbdev(intf);
1041         usb_get_dev(udev);
1042         usb_priv = rtl_usbpriv(hw);
1043         memset(usb_priv, 0, sizeof(*usb_priv));
1044         usb_priv->dev.intf = intf;
1045         usb_priv->dev.udev = udev;
1046         usb_set_intfdata(intf, hw);
1047         /* init cfg & intf_ops */
1048         rtlpriv->rtlhal.interface = INTF_USB;
1049         rtlpriv->cfg = rtl_hal_cfg;
1050         rtlpriv->intf_ops = &rtl_usb_ops;
1051         /* Init IO handler */
1052         _rtl_usb_io_handler_init(&udev->dev, hw);
1053         rtlpriv->cfg->ops->read_chip_version(hw);
1054         /*like read eeprom and so on */
1055         rtlpriv->cfg->ops->read_eeprom_info(hw);
1056         err = _rtl_usb_init(hw);
1057         if (err)
1058                 goto error_out2;
1059         rtl_usb_init_sw(hw);
1060         /* Init mac80211 sw */
1061         err = rtl_init_core(hw);
1062         if (err) {
1063                 pr_err("Can't allocate sw for mac80211\n");
1064                 goto error_out2;
1065         }
1066         if (rtlpriv->cfg->ops->init_sw_vars(hw)) {
1067                 pr_err("Can't init_sw_vars\n");
1068                 goto error_out;
1069         }
1070         rtlpriv->cfg->ops->init_sw_leds(hw);
1071
1072         err = ieee80211_register_hw(hw);
1073         if (err) {
1074                 pr_err("Can't register mac80211 hw.\n");
1075                 err = -ENODEV;
1076                 goto error_out;
1077         }
1078         rtlpriv->mac80211.mac80211_registered = 1;
1079
1080         set_bit(RTL_STATUS_INTERFACE_START, &rtlpriv->status);
1081         return 0;
1082
1083 error_out:
1084         rtl_deinit_core(hw);
1085 error_out2:
1086         _rtl_usb_io_handler_release(hw);
1087         usb_put_dev(udev);
1088         complete(&rtlpriv->firmware_loading_complete);
1089         kfree(rtlpriv->usb_data);
1090         return -ENODEV;
1091 }
1092 EXPORT_SYMBOL(rtl_usb_probe);
1093
1094 void rtl_usb_disconnect(struct usb_interface *intf)
1095 {
1096         struct ieee80211_hw *hw = usb_get_intfdata(intf);
1097         struct rtl_priv *rtlpriv = rtl_priv(hw);
1098         struct rtl_mac *rtlmac = rtl_mac(rtl_priv(hw));
1099         struct rtl_usb *rtlusb = rtl_usbdev(rtl_usbpriv(hw));
1100
1101         if (unlikely(!rtlpriv))
1102                 return;
1103         /* just in case driver is removed before firmware callback */
1104         wait_for_completion(&rtlpriv->firmware_loading_complete);
1105         clear_bit(RTL_STATUS_INTERFACE_START, &rtlpriv->status);
1106         /*ieee80211_unregister_hw will call ops_stop */
1107         if (rtlmac->mac80211_registered == 1) {
1108                 ieee80211_unregister_hw(hw);
1109                 rtlmac->mac80211_registered = 0;
1110         } else {
1111                 rtl_deinit_deferred_work(hw, false);
1112                 rtlpriv->intf_ops->adapter_stop(hw);
1113         }
1114         /*deinit rfkill */
1115         /* rtl_deinit_rfkill(hw); */
1116         rtl_usb_deinit(hw);
1117         rtl_deinit_core(hw);
1118         kfree(rtlpriv->usb_data);
1119         rtlpriv->cfg->ops->deinit_sw_leds(hw);
1120         rtlpriv->cfg->ops->deinit_sw_vars(hw);
1121         _rtl_usb_io_handler_release(hw);
1122         usb_put_dev(rtlusb->udev);
1123         usb_set_intfdata(intf, NULL);
1124         ieee80211_free_hw(hw);
1125 }
1126 EXPORT_SYMBOL(rtl_usb_disconnect);
1127
1128 int rtl_usb_suspend(struct usb_interface *pusb_intf, pm_message_t message)
1129 {
1130         return 0;
1131 }
1132 EXPORT_SYMBOL(rtl_usb_suspend);
1133
1134 int rtl_usb_resume(struct usb_interface *pusb_intf)
1135 {
1136         return 0;
1137 }
1138 EXPORT_SYMBOL(rtl_usb_resume);