drivers/staging/gdm72xx/gdm_usb.c

   1 /*
   2  * Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved.
   3  *
   4  * This software is licensed under the terms of the GNU General Public
   5  * License version 2, as published by the Free Software Foundation, and
   6  * may be copied, distributed, and modified under those terms.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/version.h>
  16 #include <linux/kernel.h>
  17 #include <linux/usb.h>
  18 #include <asm/byteorder.h>
  19
  20 #include "gdm_usb.h"
  21 #include "gdm_wimax.h"
  22 #include "usb_boot.h"
  23 #include "hci.h"
  24
  25 #include "usb_ids.h"
  26
  27 MODULE_DEVICE_TABLE(usb, id_table);
  28
  29 #define TX_BUF_SIZE     2048
  30 #if defined(CONFIG_WIMAX_GDM72XX_WIMAX2)
  31 #define RX_BUF_SIZE     (128*1024)      /* For packet aggregation */
  32 #else
  33 #define RX_BUF_SIZE     2048
  34 #endif
  35
  36 #define GDM7205_PADDING         256
  37
  38 #define H2B(x)          __cpu_to_be16(x)
  39 #define B2H(x)          __be16_to_cpu(x)
  40 #define DB2H(x)         __be32_to_cpu(x)
  41
  42 #define DOWNLOAD_CONF_VALUE             0x21
  43
  44 #ifdef CONFIG_WIMAX_GDM72XX_K_MODE
  45
  46 static DECLARE_WAIT_QUEUE_HEAD(k_wait);
  47 static LIST_HEAD(k_list);
  48 static DEFINE_SPINLOCK(k_lock);
  49 static int k_mode_stop;
  50
  51 #define K_WAIT_TIME     (2 * HZ / 100)
  52
  53 #endif /* CONFIG_WIMAX_GDM72XX_K_MODE */
  54
  55 static int init_usb(struct usbwm_dev *udev);
  56 static void release_usb(struct usbwm_dev *udev);
  57
  58 /*#define DEBUG */
  59 #ifdef DEBUG
  60 static void hexdump(char *title, u8 *data, int len)
  61 {
  62         int i;
  63
  64         printk(KERN_DEBUG "%s: length = %d\n", title, len);
  65         for (i = 0; i < len; i++) {
  66                 printk(KERN_DEBUG "%02x ", data[i]);
  67                 if ((i & 0xf) == 0xf)
  68                         printk(KERN_DEBUG "\n");
  69         }
  70         printk(KERN_DEBUG "\n");
  71 }
  72 #endif
  73
  74 static struct usb_tx *alloc_tx_struct(struct tx_cxt *tx)
  75 {
  76         struct usb_tx *t = NULL;
  77
  78         t = kmalloc(sizeof(*t), GFP_ATOMIC);
  79         if (t == NULL)
  80                 goto out;
  81
  82         memset(t, 0, sizeof(*t));
  83
  84         t->urb = usb_alloc_urb(0, GFP_ATOMIC);
  85         t->buf = kmalloc(TX_BUF_SIZE, GFP_ATOMIC);
  86         if (t->urb == NULL || t->buf == NULL)
  87                 goto out;
  88
  89         t->tx_cxt = tx;
  90
  91         return t;
  92 out:
  93         if (t) {
  94                 usb_free_urb(t->urb);
  95                 kfree(t->buf);
  96                 kfree(t);
  97         }
  98         return NULL;
  99 }
 100
 101 static void free_tx_struct(struct usb_tx *t)
 102 {
 103         if (t) {
 104                 usb_free_urb(t->urb);
 105                 kfree(t->buf);
 106                 kfree(t);
 107         }
 108 }
 109
 110 static struct usb_rx *alloc_rx_struct(struct rx_cxt *rx)
 111 {
 112         struct usb_rx *r = NULL;
 113
 114         r = kmalloc(sizeof(*r), GFP_ATOMIC);
 115         if (r == NULL)
 116                 goto out;
 117
 118         memset(r, 0, sizeof(*r));
 119
 120         r->urb = usb_alloc_urb(0, GFP_ATOMIC);
 121         r->buf = kmalloc(RX_BUF_SIZE, GFP_ATOMIC);
 122         if (r->urb == NULL || r->buf == NULL)
 123                 goto out;
 124
 125         r->rx_cxt = rx;
 126         return r;
 127 out:
 128         if (r) {
 129                 usb_free_urb(r->urb);
 130                 kfree(r->buf);
 131                 kfree(r);
 132         }
 133         return NULL;
 134 }
 135
 136 static void free_rx_struct(struct usb_rx *r)
 137 {
 138         if (r) {
 139                 usb_free_urb(r->urb);
 140                 kfree(r->buf);
 141                 kfree(r);
 142         }
 143 }
 144
 145 /* Before this function is called, spin lock should be locked. */
 146 static struct usb_tx *get_tx_struct(struct tx_cxt *tx, int *no_spc)
 147 {
 148         struct usb_tx *t;
 149
 150         if (list_empty(&tx->free_list)) {
 151                 *no_spc = 1;
 152                 return NULL;
 153         }
 154
 155         t = list_entry(tx->free_list.next, struct usb_tx, list);
 156         list_del(&t->list);
 157
 158         *no_spc = list_empty(&tx->free_list) ? 1 : 0;
 159
 160         return t;
 161 }
 162
 163 /* Before this function is called, spin lock should be locked. */
 164 static void put_tx_struct(struct tx_cxt *tx, struct usb_tx *t)
 165 {
 166         list_add_tail(&t->list, &tx->free_list);
 167 }
 168
 169 /* Before this function is called, spin lock should be locked. */
 170 static struct usb_rx *get_rx_struct(struct rx_cxt *rx)
 171 {
 172         struct usb_rx *r;
 173
 174         if (list_empty(&rx->free_list)) {
 175                 r = alloc_rx_struct(rx);
 176                 if (r == NULL)
 177                         return NULL;
 178
 179                 list_add(&r->list, &rx->free_list);
 180         }
 181
 182         r = list_entry(rx->free_list.next, struct usb_rx, list);
 183         list_del(&r->list);
 184         list_add_tail(&r->list, &rx->used_list);
 185
 186         return r;
 187 }
 188
 189 /* Before this function is called, spin lock should be locked. */
 190 static void put_rx_struct(struct rx_cxt *rx, struct usb_rx *r)
 191 {
 192         list_del(&r->list);
 193         list_add(&r->list, &rx->free_list);
 194 }
 195
 196 static int init_usb(struct usbwm_dev *udev)
 197 {
 198         int ret = 0, i;
 199         struct tx_cxt   *tx = &udev->tx;
 200         struct rx_cxt   *rx = &udev->rx;
 201         struct usb_tx   *t;
 202         struct usb_rx   *r;
 203
 204         INIT_LIST_HEAD(&tx->free_list);
 205         INIT_LIST_HEAD(&tx->sdu_list);
 206         INIT_LIST_HEAD(&tx->hci_list);
 207 #if defined(CONFIG_WIMAX_GDM72XX_USB_PM) || defined(CONFIG_WIMAX_GDM72XX_K_MODE)
 208         INIT_LIST_HEAD(&tx->pending_list);
 209 #endif
 210
 211         INIT_LIST_HEAD(&rx->free_list);
 212         INIT_LIST_HEAD(&rx->used_list);
 213
 214         spin_lock_init(&tx->lock);
 215         spin_lock_init(&rx->lock);
 216
 217         for (i = 0; i < MAX_NR_SDU_BUF; i++) {
 218                 t = alloc_tx_struct(tx);
 219                 if (t == NULL) {
 220                         ret = -ENOMEM;
 221                         goto fail;
 222                 }
 223                 list_add(&t->list, &tx->free_list);
 224         }
 225
 226         r = alloc_rx_struct(rx);
 227         if (r == NULL) {
 228                 ret = -ENOMEM;
 229                 goto fail;
 230         }
 231
 232         list_add(&r->list, &rx->free_list);
 233         return ret;
 234
 235 fail:
 236         release_usb(udev);
 237         return ret;
 238 }
 239
 240 static void release_usb(struct usbwm_dev *udev)
 241 {
 242         struct tx_cxt   *tx = &udev->tx;
 243         struct rx_cxt   *rx = &udev->rx;
 244         struct usb_tx   *t, *t_next;
 245         struct usb_rx   *r, *r_next;
 246
 247         list_for_each_entry_safe(t, t_next, &tx->sdu_list, list) {
 248                 list_del(&t->list);
 249                 free_tx_struct(t);
 250         }
 251
 252         list_for_each_entry_safe(t, t_next, &tx->hci_list, list) {
 253                 list_del(&t->list);
 254                 free_tx_struct(t);
 255         }
 256
 257         list_for_each_entry_safe(t, t_next, &tx->free_list, list) {
 258                 list_del(&t->list);
 259                 free_tx_struct(t);
 260         }
 261
 262         list_for_each_entry_safe(r, r_next, &rx->free_list, list) {
 263                 list_del(&r->list);
 264                 free_rx_struct(r);
 265         }
 266
 267         list_for_each_entry_safe(r, r_next, &rx->used_list, list) {
 268                 list_del(&r->list);
 269                 free_rx_struct(r);
 270         }
 271 }
 272
 273 static void gdm_usb_send_complete(struct urb *urb)
 274 {
 275         struct usb_tx *t = urb->context;
 276         struct tx_cxt *tx = t->tx_cxt;
 277         u8 *pkt = t->buf;
 278         u16 cmd_evt;
 279         unsigned long flags;
 280
 281         /* Completion by usb_unlink_urb */
 282         if (urb->status == -ECONNRESET)
 283                 return;
 284
 285         spin_lock_irqsave(&tx->lock, flags);
 286
 287         if (t->callback)
 288                 t->callback(t->cb_data);
 289
 290         /* Delete from sdu list or hci list. */
 291         list_del(&t->list);
 292
 293         cmd_evt = (pkt[0] << 8) | pkt[1];
 294         if (cmd_evt == WIMAX_TX_SDU)
 295                 put_tx_struct(tx, t);
 296         else
 297                 free_tx_struct(t);
 298
 299         spin_unlock_irqrestore(&tx->lock, flags);
 300 }
 301
 302 static int gdm_usb_send(void *priv_dev, void *data, int len,
 303                         void (*cb)(void *data), void *cb_data)
 304 {
 305         struct usbwm_dev *udev = priv_dev;
 306         struct usb_device *usbdev = udev->usbdev;
 307         struct tx_cxt *tx = &udev->tx;
 308         struct usb_tx *t;
 309         int padding = udev->padding;
 310         int no_spc = 0, ret;
 311         u8 *pkt = data;
 312         u16 cmd_evt;
 313         unsigned long flags;
 314
 315         if (!udev->usbdev) {
 316                 printk(KERN_ERR "%s: No such device\n", __func__);
 317                 return -ENODEV;
 318         }
 319
 320         BUG_ON(len > TX_BUF_SIZE - padding - 1);
 321
 322         spin_lock_irqsave(&tx->lock, flags);
 323
 324         cmd_evt = (pkt[0] << 8) | pkt[1];
 325         if (cmd_evt == WIMAX_TX_SDU) {
 326                 t = get_tx_struct(tx, &no_spc);
 327                 if (t == NULL) {
 328                         /* This case must not happen. */
 329                         spin_unlock_irqrestore(&tx->lock, flags);
 330                         return -ENOSPC;
 331                 }
 332                 list_add_tail(&t->list, &tx->sdu_list);
 333         } else {
 334                 t = alloc_tx_struct(tx);
 335                 if (t == NULL) {
 336                         spin_unlock_irqrestore(&tx->lock, flags);
 337                         return -ENOMEM;
 338                 }
 339                 list_add_tail(&t->list, &tx->hci_list);
 340         }
 341
 342         memcpy(t->buf + padding, data, len);
 343         t->callback = cb;
 344         t->cb_data = cb_data;
 345
 346         /*
 347          * In some cases, USB Module of WiMax is blocked when data size is
 348          * the multiple of 512. So, increment length by one in that case.
 349          */
 350         if ((len % 512) == 0)
 351                 len++;
 352
 353         usb_fill_bulk_urb(t->urb,
 354                         usbdev,
 355                         usb_sndbulkpipe(usbdev, 1),
 356                         t->buf,
 357                         len + padding,
 358                         gdm_usb_send_complete,
 359                         t);
 360
 361 #ifdef DEBUG
 362         hexdump("usb_send", t->buf, len + padding);
 363 #endif
 364 #ifdef CONFIG_WIMAX_GDM72XX_USB_PM
 365         if (usbdev->state & USB_STATE_SUSPENDED) {
 366                 list_add_tail(&t->p_list, &tx->pending_list);
 367                 schedule_work(&udev->pm_ws);
 368                 goto out;
 369         }
 370 #endif /* CONFIG_WIMAX_GDM72XX_USB_PM */
 371
 372 #ifdef CONFIG_WIMAX_GDM72XX_K_MODE
 373         if (udev->bw_switch) {
 374                 list_add_tail(&t->p_list, &tx->pending_list);
 375                 goto out;
 376         } else if (cmd_evt == WIMAX_SCAN) {
 377                 struct rx_cxt *rx;
 378                 struct usb_rx *r;
 379
 380                 rx = &udev->rx;
 381
 382                 list_for_each_entry(r, &rx->used_list, list)
 383                         usb_unlink_urb(r->urb);
 384                 udev->bw_switch = 1;
 385
 386                 spin_lock(&k_lock);
 387                 list_add_tail(&udev->list, &k_list);
 388                 spin_unlock(&k_lock);
 389
 390                 wake_up(&k_wait);
 391         }
 392 #endif /* CONFIG_WIMAX_GDM72XX_K_MODE */
 393
 394         ret = usb_submit_urb(t->urb, GFP_ATOMIC);
 395         if (ret)
 396                 goto send_fail;
 397
 398 #ifdef CONFIG_WIMAX_GDM72XX_USB_PM
 399         usb_mark_last_busy(usbdev);
 400 #endif /* CONFIG_WIMAX_GDM72XX_USB_PM */
 401
 402 #if defined(CONFIG_WIMAX_GDM72XX_USB_PM) || defined(CONFIG_WIMAX_GDM72XX_K_MODE)
 403 out:
 404 #endif
 405         spin_unlock_irqrestore(&tx->lock, flags);
 406
 407         if (no_spc)
 408                 return -ENOSPC;
 409
 410         return 0;
 411
 412 send_fail:
 413         t->callback = NULL;
 414         gdm_usb_send_complete(t->urb);
 415         spin_unlock_irqrestore(&tx->lock, flags);
 416         return ret;
 417 }
 418
 419 static void gdm_usb_rcv_complete(struct urb *urb)
 420 {
 421         struct usb_rx *r = urb->context;
 422         struct rx_cxt *rx = r->rx_cxt;
 423         struct usbwm_dev *udev = container_of(r->rx_cxt, struct usbwm_dev, rx);
 424         struct tx_cxt *tx = &udev->tx;
 425         struct usb_tx *t;
 426         u16 cmd_evt;
 427         unsigned long flags;
 428
 429 #ifdef CONFIG_WIMAX_GDM72XX_USB_PM
 430         struct usb_device *dev = urb->dev;
 431 #endif
 432
 433         /* Completion by usb_unlink_urb */
 434         if (urb->status == -ECONNRESET)
 435                 return;
 436
 437         spin_lock_irqsave(&tx->lock, flags);
 438
 439         if (!urb->status) {
 440                 cmd_evt = (r->buf[0] << 8) | (r->buf[1]);
 441 #ifdef DEBUG
 442                 hexdump("usb_receive", r->buf, urb->actual_length);
 443 #endif
 444                 if (cmd_evt == WIMAX_SDU_TX_FLOW) {
 445                         if (r->buf[4] == 0) {
 446 #ifdef DEBUG
 447                                 printk(KERN_DEBUG "WIMAX ==> STOP SDU TX\n");
 448 #endif
 449                                 list_for_each_entry(t, &tx->sdu_list, list)
 450                                         usb_unlink_urb(t->urb);
 451                         } else if (r->buf[4] == 1) {
 452 #ifdef DEBUG
 453                                 printk(KERN_DEBUG "WIMAX ==> START SDU TX\n");
 454 #endif
 455                                 list_for_each_entry(t, &tx->sdu_list, list) {
 456                                         usb_submit_urb(t->urb, GFP_ATOMIC);
 457                                 }
 458                                 /*
 459                                  * If free buffer for sdu tx doesn't
 460                                  * exist, then tx queue should not be
 461                                  * woken. For this reason, don't pass
 462                                  * the command, START_SDU_TX.
 463                                  */
 464                                 if (list_empty(&tx->free_list))
 465                                         urb->actual_length = 0;
 466                         }
 467                 }
 468         }
 469
 470         if (!urb->status && r->callback)
 471                 r->callback(r->cb_data, r->buf, urb->actual_length);
 472
 473         spin_lock(&rx->lock);
 474         put_rx_struct(rx, r);
 475         spin_unlock(&rx->lock);
 476
 477         spin_unlock_irqrestore(&tx->lock, flags);
 478
 479 #ifdef CONFIG_WIMAX_GDM72XX_USB_PM
 480         usb_mark_last_busy(dev);
 481 #endif
 482 }
 483
 484 static int gdm_usb_receive(void *priv_dev,
 485                         void (*cb)(void *cb_data, void *data, int len),
 486                         void *cb_data)
 487 {
 488         struct usbwm_dev *udev = priv_dev;
 489         struct usb_device *usbdev = udev->usbdev;
 490         struct rx_cxt *rx = &udev->rx;
 491         struct usb_rx *r;
 492         unsigned long flags;
 493
 494         if (!udev->usbdev) {
 495                 printk(KERN_ERR "%s: No such device\n", __func__);
 496                 return -ENODEV;
 497         }
 498
 499         spin_lock_irqsave(&rx->lock, flags);
 500         r = get_rx_struct(rx);
 501         spin_unlock_irqrestore(&rx->lock, flags);
 502
 503         if (r == NULL)
 504                 return -ENOMEM;
 505
 506         r->callback = cb;
 507         r->cb_data = cb_data;
 508
 509         usb_fill_bulk_urb(r->urb,
 510                         usbdev,
 511                         usb_rcvbulkpipe(usbdev, 0x82),
 512                         r->buf,
 513                         RX_BUF_SIZE,
 514                         gdm_usb_rcv_complete,
 515                         r);
 516
 517         return usb_submit_urb(r->urb, GFP_ATOMIC);
 518 }
 519
 520 #ifdef CONFIG_WIMAX_GDM72XX_USB_PM
 521 static void do_pm_control(struct work_struct *work)
 522 {
 523         struct usbwm_dev *udev = container_of(work, struct usbwm_dev, pm_ws);
 524         struct tx_cxt *tx = &udev->tx;
 525         int ret;
 526         unsigned long flags;
 527
 528         ret = usb_autopm_get_interface(udev->intf);
 529         if (!ret)
 530                 usb_autopm_put_interface(udev->intf);
 531
 532         spin_lock_irqsave(&tx->lock, flags);
 533         if (!(udev->usbdev->state & USB_STATE_SUSPENDED)
 534                 && (!list_empty(&tx->hci_list) || !list_empty(&tx->sdu_list))) {
 535                 struct usb_tx *t, *temp;
 536
 537                 list_for_each_entry_safe(t, temp, &tx->pending_list, p_list) {
 538                         list_del(&t->p_list);
 539                         ret =  usb_submit_urb(t->urb, GFP_ATOMIC);
 540
 541                         if (ret) {
 542                                 t->callback = NULL;
 543                                 gdm_usb_send_complete(t->urb);
 544                         }
 545                 }
 546         }
 547         spin_unlock_irqrestore(&tx->lock, flags);
 548 }
 549 #endif /* CONFIG_WIMAX_GDM72XX_USB_PM */
 550
 551 static int gdm_usb_probe(struct usb_interface *intf,
 552                                 const struct usb_device_id *id)
 553 {
 554         int ret = 0;
 555         u8 bConfigurationValue;
 556         struct phy_dev *phy_dev = NULL;
 557         struct usbwm_dev *udev = NULL;
 558         u16 idVendor, idProduct, bcdDevice;
 559
 560         struct usb_device *usbdev = interface_to_usbdev(intf);
 561
 562         usb_get_dev(usbdev);
 563         bConfigurationValue = usbdev->actconfig->desc.bConfigurationValue;
 564
 565         /*USB description is set up with Little-Endian*/
 566         idVendor = L2H(usbdev->descriptor.idVendor);
 567         idProduct = L2H(usbdev->descriptor.idProduct);
 568         bcdDevice = L2H(usbdev->descriptor.bcdDevice);
 569
 570         printk(KERN_INFO "Found GDM USB VID = 0x%04x PID = 0x%04x...\n",
 571                 idVendor, idProduct);
 572         printk(KERN_INFO "GCT WiMax driver version %s\n", DRIVER_VERSION);
 573
 574
 575         if (idProduct == EMERGENCY_PID) {
 576                 ret = usb_emergency(usbdev);
 577                 goto out;
 578         }
 579
 580         /* Support for EEPROM bootloader */
 581         if (bConfigurationValue == DOWNLOAD_CONF_VALUE ||
 582                 idProduct & B_DOWNLOAD) {
 583                 ret = usb_boot(usbdev, bcdDevice);
 584                 goto out;
 585         }
 586
 587         phy_dev = kmalloc(sizeof(*phy_dev), GFP_KERNEL);
 588         if (phy_dev == NULL) {
 589                 ret = -ENOMEM;
 590                 goto out;
 591         }
 592         udev = kmalloc(sizeof(*udev), GFP_KERNEL);
 593         if (udev == NULL) {
 594                 ret = -ENOMEM;
 595                 goto out;
 596         }
 597
 598         memset(phy_dev, 0, sizeof(*phy_dev));
 599         memset(udev, 0, sizeof(*udev));
 600
 601         if (idProduct == 0x7205 || idProduct == 0x7206)
 602                 udev->padding = GDM7205_PADDING;
 603         else
 604                 udev->padding = 0;
 605
 606         phy_dev->priv_dev = (void *)udev;
 607         phy_dev->send_func = gdm_usb_send;
 608         phy_dev->rcv_func = gdm_usb_receive;
 609
 610         ret = init_usb(udev);
 611         if (ret < 0)
 612                 goto out;
 613
 614         udev->usbdev = usbdev;
 615
 616 #ifdef CONFIG_WIMAX_GDM72XX_USB_PM
 617         udev->intf = intf;
 618
 619         intf->needs_remote_wakeup = 1;
 620         device_init_wakeup(&intf->dev, 1);
 621
 622         pm_runtime_set_autosuspend_delay(&usbdev->dev, 10 * 1000); /* msec */
 623
 624         INIT_WORK(&udev->pm_ws, do_pm_control);
 625 #endif /* CONFIG_WIMAX_GDM72XX_USB_PM */
 626
 627         ret = register_wimax_device(phy_dev);
 628
 629 out:
 630         if (ret) {
 631                 kfree(phy_dev);
 632                 kfree(udev);
 633         }
 634         usb_set_intfdata(intf, phy_dev);
 635         return ret;
 636 }
 637
 638 static void gdm_usb_disconnect(struct usb_interface *intf)
 639 {
 640         u8 bConfigurationValue;
 641         struct phy_dev *phy_dev;
 642         struct usbwm_dev *udev;
 643         u16 idProduct;
 644         struct usb_device *usbdev = interface_to_usbdev(intf);
 645
 646         bConfigurationValue = usbdev->actconfig->desc.bConfigurationValue;
 647         phy_dev = usb_get_intfdata(intf);
 648
 649         /*USB description is set up with Little-Endian*/
 650         idProduct = L2H(usbdev->descriptor.idProduct);
 651
 652         if (idProduct != EMERGENCY_PID &&
 653                         bConfigurationValue != DOWNLOAD_CONF_VALUE &&
 654                         (idProduct & B_DOWNLOAD) == 0) {
 655                 udev = phy_dev->priv_dev;
 656                 udev->usbdev = NULL;
 657
 658                 unregister_wimax_device(phy_dev);
 659                 release_usb(udev);
 660                 kfree(udev);
 661                 kfree(phy_dev);
 662         }
 663
 664         usb_put_dev(usbdev);
 665 }
 666
 667 #ifdef CONFIG_WIMAX_GDM72XX_USB_PM
 668 static int gdm_suspend(struct usb_interface *intf, pm_message_t pm_msg)
 669 {
 670         struct phy_dev *phy_dev;
 671         struct usbwm_dev *udev;
 672         struct rx_cxt *rx;
 673         struct usb_rx *r;
 674
 675         phy_dev = usb_get_intfdata(intf);
 676         udev = phy_dev->priv_dev;
 677         rx = &udev->rx;
 678
 679         list_for_each_entry(r, &rx->used_list, list)
 680                 usb_unlink_urb(r->urb);
 681
 682         return 0;
 683 }
 684
 685 static int gdm_resume(struct usb_interface *intf)
 686 {
 687         struct phy_dev *phy_dev;
 688         struct usbwm_dev *udev;
 689         struct rx_cxt *rx;
 690         struct usb_rx *r;
 691
 692         phy_dev = usb_get_intfdata(intf);
 693         udev = phy_dev->priv_dev;
 694         rx = &udev->rx;
 695
 696         list_for_each_entry(r, &rx->used_list, list)
 697                 usb_submit_urb(r->urb, GFP_ATOMIC);
 698
 699         return 0;
 700 }
 701
 702 #endif /* CONFIG_WIMAX_GDM72XX_USB_PM */
 703
 704 #ifdef CONFIG_WIMAX_GDM72XX_K_MODE
 705 static int k_mode_thread(void *arg)
 706 {
 707         struct usbwm_dev *udev;
 708         struct tx_cxt *tx;
 709         struct rx_cxt *rx;
 710         struct usb_tx *t, *temp;
 711         struct usb_rx *r;
 712         unsigned long flags, flags2, expire;
 713         int ret;
 714
 715         daemonize("k_mode_wimax");
 716
 717         while (!k_mode_stop) {
 718
 719                 spin_lock_irqsave(&k_lock, flags2);
 720                 while (!list_empty(&k_list)) {
 721
 722                         udev = list_entry(k_list.next, struct usbwm_dev, list);
 723                         tx = &udev->tx;
 724                         rx = &udev->rx;
 725
 726                         list_del(&udev->list);
 727                         spin_unlock_irqrestore(&k_lock, flags2);
 728
 729                         expire = jiffies + K_WAIT_TIME;
 730                         while (jiffies < expire)
 731                                 schedule_timeout(K_WAIT_TIME);
 732
 733                         list_for_each_entry(r, &rx->used_list, list)
 734                                 usb_submit_urb(r->urb, GFP_ATOMIC);
 735
 736                         spin_lock_irqsave(&tx->lock, flags);
 737
 738                         list_for_each_entry_safe(t, temp, &tx->pending_list,
 739                                                 p_list) {
 740                                 list_del(&t->p_list);
 741                                 ret = usb_submit_urb(t->urb, GFP_ATOMIC);
 742
 743                                 if (ret) {
 744                                         t->callback = NULL;
 745                                         gdm_usb_send_complete(t->urb);
 746                                 }
 747                         }
 748
 749                         udev->bw_switch = 0;
 750                         spin_unlock_irqrestore(&tx->lock, flags);
 751
 752                         spin_lock_irqsave(&k_lock, flags2);
 753                 }
 754                 spin_unlock_irqrestore(&k_lock, flags2);
 755
 756                 interruptible_sleep_on(&k_wait);
 757         }
 758         return 0;
 759 }
 760 #endif /* CONFIG_WIMAX_GDM72XX_K_MODE */
 761
 762 static struct usb_driver gdm_usb_driver = {
 763         .name = "gdm_wimax",
 764         .probe = gdm_usb_probe,
 765         .disconnect = gdm_usb_disconnect,
 766         .id_table = id_table,
 767 #ifdef CONFIG_WIMAX_GDM72XX_USB_PM
 768         .supports_autosuspend = 1,
 769         .suspend = gdm_suspend,
 770         .resume = gdm_resume,
 771         .reset_resume = gdm_resume,
 772 #endif
 773 };
 774
 775 static int __init usb_gdm_wimax_init(void)
 776 {
 777 #ifdef CONFIG_WIMAX_GDM72XX_K_MODE
 778         kernel_thread(k_mode_thread, NULL, CLONE_KERNEL);
 779 #endif /* CONFIG_WIMAX_GDM72XX_K_MODE */
 780         return usb_register(&gdm_usb_driver);
 781 }
 782
 783 static void __exit usb_gdm_wimax_exit(void)
 784 {
 785 #ifdef CONFIG_WIMAX_GDM72XX_K_MODE
 786         k_mode_stop = 1;
 787         wake_up(&k_wait);
 788 #endif
 789         usb_deregister(&gdm_usb_driver);
 790 }
 791
 792 module_init(usb_gdm_wimax_init);
 793 module_exit(usb_gdm_wimax_exit);
 794
 795 MODULE_VERSION(DRIVER_VERSION);
 796 MODULE_DESCRIPTION("GCT WiMax Device Driver");
 797 MODULE_AUTHOR("Ethan Park");
 798 MODULE_LICENSE("GPL");