drivers/staging/gdm724x/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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  15
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/usb.h>
  19 #include <linux/sched.h>
  20 #include <linux/kthread.h>
  21 #include <linux/usb/cdc.h>
  22 #include <linux/wait.h>
  23 #include <linux/if_ether.h>
  24 #include <linux/pm_runtime.h>
  25
  26 #include "gdm_usb.h"
  27 #include "gdm_lte.h"
  28 #include "hci.h"
  29 #include "hci_packet.h"
  30 #include "gdm_endian.h"
  31
  32 #define USB_DEVICE_CDC_DATA(vid, pid) \
  33         .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
  34                 USB_DEVICE_ID_MATCH_INT_CLASS | \
  35                 USB_DEVICE_ID_MATCH_INT_SUBCLASS,\
  36         .idVendor = vid,\
  37         .idProduct = pid,\
  38         .bInterfaceClass = USB_CLASS_COMM,\
  39         .bInterfaceSubClass = USB_CDC_SUBCLASS_ETHERNET
  40
  41 #define USB_DEVICE_MASS_DATA(vid, pid) \
  42         .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
  43                 USB_DEVICE_ID_MATCH_INT_INFO,\
  44         .idVendor = vid,\
  45         .idProduct = pid,\
  46         .bInterfaceSubClass = USB_SC_SCSI, \
  47         .bInterfaceClass = USB_CLASS_MASS_STORAGE,\
  48         .bInterfaceProtocol = USB_PR_BULK
  49
  50 static const struct usb_device_id id_table[] = {
  51         { USB_DEVICE_CDC_DATA(VID_GCT, PID_GDM7240) }, /* GCT GDM7240 */
  52         { USB_DEVICE_CDC_DATA(VID_GCT, PID_GDM7243) }, /* GCT GDM7243 */
  53         { }
  54 };
  55
  56 MODULE_DEVICE_TABLE(usb, id_table);
  57
  58 static void do_tx(struct work_struct *work);
  59 static void do_rx(struct work_struct *work);
  60
  61 static int gdm_usb_recv(void *priv_dev,
  62                         int (*cb)(void *cb_data,
  63                                   void *data, int len, int context),
  64                         void *cb_data,
  65                         int context);
  66
  67 static int request_mac_address(struct lte_udev *udev)
  68 {
  69         u8 buf[16] = {0,};
  70         struct hci_packet *hci = (struct hci_packet *)buf;
  71         struct usb_device *usbdev = udev->usbdev;
  72         int actual;
  73         int ret = -1;
  74
  75         hci->cmd_evt = gdm_cpu_to_dev16(&udev->gdm_ed, LTE_GET_INFORMATION);
  76         hci->len = gdm_cpu_to_dev16(&udev->gdm_ed, 1);
  77         hci->data[0] = MAC_ADDRESS;
  78
  79         ret = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 2), buf, 5,
  80                            &actual, 1000);
  81
  82         udev->request_mac_addr = 1;
  83
  84         return ret;
  85 }
  86
  87 static struct usb_tx *alloc_tx_struct(int len)
  88 {
  89         struct usb_tx *t = NULL;
  90         int ret = 0;
  91
  92         t = kzalloc(sizeof(*t), GFP_ATOMIC);
  93         if (!t) {
  94                 ret = -ENOMEM;
  95                 goto out;
  96         }
  97
  98         t->urb = usb_alloc_urb(0, GFP_ATOMIC);
  99         if (!(len % 512))
 100                 len++;
 101
 102         t->buf = kmalloc(len, GFP_ATOMIC);
 103         if (!t->urb || !t->buf) {
 104                 ret = -ENOMEM;
 105                 goto out;
 106         }
 107
 108 out:
 109         if (ret < 0) {
 110                 if (t) {
 111                         usb_free_urb(t->urb);
 112                         kfree(t->buf);
 113                         kfree(t);
 114                 }
 115                 return NULL;
 116         }
 117
 118         return t;
 119 }
 120
 121 static struct usb_tx_sdu *alloc_tx_sdu_struct(void)
 122 {
 123         struct usb_tx_sdu *t_sdu;
 124
 125         t_sdu = kzalloc(sizeof(*t_sdu), GFP_KERNEL);
 126         if (!t_sdu)
 127                 return NULL;
 128
 129         t_sdu->buf = kmalloc(SDU_BUF_SIZE, GFP_KERNEL);
 130         if (!t_sdu->buf) {
 131                 kfree(t_sdu);
 132                 return NULL;
 133         }
 134
 135         return t_sdu;
 136 }
 137
 138 static void free_tx_struct(struct usb_tx *t)
 139 {
 140         if (t) {
 141                 usb_free_urb(t->urb);
 142                 kfree(t->buf);
 143                 kfree(t);
 144         }
 145 }
 146
 147 static void free_tx_sdu_struct(struct usb_tx_sdu *t_sdu)
 148 {
 149         if (t_sdu) {
 150                 kfree(t_sdu->buf);
 151                 kfree(t_sdu);
 152         }
 153 }
 154
 155 static struct usb_tx_sdu *get_tx_sdu_struct(struct tx_cxt *tx, int *no_spc)
 156 {
 157         struct usb_tx_sdu *t_sdu;
 158
 159         if (list_empty(&tx->free_list))
 160                 return NULL;
 161
 162         t_sdu = list_entry(tx->free_list.next, struct usb_tx_sdu, list);
 163         list_del(&t_sdu->list);
 164
 165         tx->avail_count--;
 166
 167         *no_spc = list_empty(&tx->free_list) ? 1 : 0;
 168
 169         return t_sdu;
 170 }
 171
 172 static void put_tx_struct(struct tx_cxt *tx, struct usb_tx_sdu *t_sdu)
 173 {
 174         list_add_tail(&t_sdu->list, &tx->free_list);
 175         tx->avail_count++;
 176 }
 177
 178 static struct usb_rx *alloc_rx_struct(void)
 179 {
 180         struct usb_rx *r = NULL;
 181         int ret = 0;
 182
 183         r = kmalloc(sizeof(*r), GFP_KERNEL);
 184         if (!r) {
 185                 ret = -ENOMEM;
 186                 goto out;
 187         }
 188
 189         r->urb = usb_alloc_urb(0, GFP_KERNEL);
 190         r->buf = kmalloc(RX_BUF_SIZE, GFP_KERNEL);
 191         if (!r->urb || !r->buf) {
 192                 ret = -ENOMEM;
 193                 goto out;
 194         }
 195 out:
 196
 197         if (ret < 0) {
 198                 if (r) {
 199                         usb_free_urb(r->urb);
 200                         kfree(r->buf);
 201                         kfree(r);
 202                 }
 203                 return NULL;
 204         }
 205
 206         return r;
 207 }
 208
 209 static void free_rx_struct(struct usb_rx *r)
 210 {
 211         if (r) {
 212                 usb_free_urb(r->urb);
 213                 kfree(r->buf);
 214                 kfree(r);
 215         }
 216 }
 217
 218 static struct usb_rx *get_rx_struct(struct rx_cxt *rx, int *no_spc)
 219 {
 220         struct usb_rx *r;
 221         unsigned long flags;
 222
 223         spin_lock_irqsave(&rx->rx_lock, flags);
 224
 225         if (list_empty(&rx->free_list)) {
 226                 spin_unlock_irqrestore(&rx->rx_lock, flags);
 227                 return NULL;
 228         }
 229
 230         r = list_entry(rx->free_list.next, struct usb_rx, free_list);
 231         list_del(&r->free_list);
 232
 233         rx->avail_count--;
 234
 235         *no_spc = list_empty(&rx->free_list) ? 1 : 0;
 236
 237         spin_unlock_irqrestore(&rx->rx_lock, flags);
 238
 239         return r;
 240 }
 241
 242 static void put_rx_struct(struct rx_cxt *rx, struct usb_rx *r)
 243 {
 244         unsigned long flags;
 245
 246         spin_lock_irqsave(&rx->rx_lock, flags);
 247
 248         list_add_tail(&r->free_list, &rx->free_list);
 249         rx->avail_count++;
 250
 251         spin_unlock_irqrestore(&rx->rx_lock, flags);
 252 }
 253
 254 static void release_usb(struct lte_udev *udev)
 255 {
 256         struct rx_cxt   *rx = &udev->rx;
 257         struct tx_cxt   *tx = &udev->tx;
 258         struct usb_tx   *t, *t_next;
 259         struct usb_rx   *r, *r_next;
 260         struct usb_tx_sdu       *t_sdu, *t_sdu_next;
 261         unsigned long flags;
 262
 263         spin_lock_irqsave(&tx->lock, flags);
 264         list_for_each_entry_safe(t_sdu, t_sdu_next, &tx->sdu_list, list) {
 265                 list_del(&t_sdu->list);
 266                 free_tx_sdu_struct(t_sdu);
 267         }
 268
 269         list_for_each_entry_safe(t, t_next, &tx->hci_list, list) {
 270                 list_del(&t->list);
 271                 free_tx_struct(t);
 272         }
 273
 274         list_for_each_entry_safe(t_sdu, t_sdu_next, &tx->free_list, list) {
 275                 list_del(&t_sdu->list);
 276                 free_tx_sdu_struct(t_sdu);
 277         }
 278         spin_unlock_irqrestore(&tx->lock, flags);
 279
 280         spin_lock_irqsave(&rx->submit_lock, flags);
 281         list_for_each_entry_safe(r, r_next, &rx->rx_submit_list,
 282                                  rx_submit_list) {
 283                 spin_unlock_irqrestore(&rx->submit_lock, flags);
 284                 usb_kill_urb(r->urb);
 285                 spin_lock_irqsave(&rx->submit_lock, flags);
 286         }
 287         spin_unlock_irqrestore(&rx->submit_lock, flags);
 288
 289         spin_lock_irqsave(&rx->rx_lock, flags);
 290         list_for_each_entry_safe(r, r_next, &rx->free_list, free_list) {
 291                 list_del(&r->free_list);
 292                 free_rx_struct(r);
 293         }
 294         spin_unlock_irqrestore(&rx->rx_lock, flags);
 295
 296         spin_lock_irqsave(&rx->to_host_lock, flags);
 297         list_for_each_entry_safe(r, r_next, &rx->to_host_list, to_host_list) {
 298                 if (r->index == (void *)udev) {
 299                         list_del(&r->to_host_list);
 300                         free_rx_struct(r);
 301                 }
 302         }
 303         spin_unlock_irqrestore(&rx->to_host_lock, flags);
 304 }
 305
 306 static int init_usb(struct lte_udev *udev)
 307 {
 308         int ret = 0;
 309         int i;
 310         struct tx_cxt *tx = &udev->tx;
 311         struct rx_cxt *rx = &udev->rx;
 312         struct usb_tx_sdu *t_sdu = NULL;
 313         struct usb_rx *r = NULL;
 314
 315         udev->send_complete = 1;
 316         udev->tx_stop = 0;
 317         udev->request_mac_addr = 0;
 318         udev->usb_state = PM_NORMAL;
 319
 320         INIT_LIST_HEAD(&tx->sdu_list);
 321         INIT_LIST_HEAD(&tx->hci_list);
 322         INIT_LIST_HEAD(&tx->free_list);
 323         INIT_LIST_HEAD(&rx->rx_submit_list);
 324         INIT_LIST_HEAD(&rx->free_list);
 325         INIT_LIST_HEAD(&rx->to_host_list);
 326         spin_lock_init(&tx->lock);
 327         spin_lock_init(&rx->rx_lock);
 328         spin_lock_init(&rx->submit_lock);
 329         spin_lock_init(&rx->to_host_lock);
 330
 331         tx->avail_count = 0;
 332         rx->avail_count = 0;
 333
 334         udev->rx_cb = NULL;
 335
 336         for (i = 0; i < MAX_NUM_SDU_BUF; i++) {
 337                 t_sdu = alloc_tx_sdu_struct();
 338                 if (!t_sdu) {
 339                         ret = -ENOMEM;
 340                         goto fail;
 341                 }
 342
 343                 list_add(&t_sdu->list, &tx->free_list);
 344                 tx->avail_count++;
 345         }
 346
 347         for (i = 0; i < MAX_RX_SUBMIT_COUNT * 2; i++) {
 348                 r = alloc_rx_struct();
 349                 if (!r) {
 350                         ret = -ENOMEM;
 351                         goto fail;
 352                 }
 353
 354                 list_add(&r->free_list, &rx->free_list);
 355                 rx->avail_count++;
 356         }
 357         INIT_DELAYED_WORK(&udev->work_tx, do_tx);
 358         INIT_DELAYED_WORK(&udev->work_rx, do_rx);
 359         return 0;
 360 fail:
 361         release_usb(udev);
 362         return ret;
 363 }
 364
 365 static int set_mac_address(u8 *data, void *arg)
 366 {
 367         struct phy_dev *phy_dev = arg;
 368         struct lte_udev *udev = phy_dev->priv_dev;
 369         struct tlv *tlv = (struct tlv *)data;
 370         u8 mac_address[ETH_ALEN] = {0, };
 371
 372         if (tlv->type == MAC_ADDRESS && udev->request_mac_addr) {
 373                 memcpy(mac_address, tlv->data, tlv->len);
 374
 375                 if (register_lte_device(phy_dev,
 376                                         &udev->intf->dev, mac_address) < 0)
 377                         pr_err("register lte device failed\n");
 378
 379                 udev->request_mac_addr = 0;
 380
 381                 return 1;
 382         }
 383
 384         return 0;
 385 }
 386
 387 static void do_rx(struct work_struct *work)
 388 {
 389         struct lte_udev *udev =
 390                 container_of(work, struct lte_udev, work_rx.work);
 391         struct rx_cxt *rx = &udev->rx;
 392         struct usb_rx *r;
 393         struct hci_packet *hci;
 394         struct phy_dev *phy_dev;
 395         u16 cmd_evt;
 396         int ret;
 397         unsigned long flags;
 398
 399         while (1) {
 400                 spin_lock_irqsave(&rx->to_host_lock, flags);
 401                 if (list_empty(&rx->to_host_list)) {
 402                         spin_unlock_irqrestore(&rx->to_host_lock, flags);
 403                         break;
 404                 }
 405                 r = list_entry(rx->to_host_list.next,
 406                                struct usb_rx, to_host_list);
 407                 list_del(&r->to_host_list);
 408                 spin_unlock_irqrestore(&rx->to_host_lock, flags);
 409
 410                 phy_dev = r->cb_data;
 411                 udev = phy_dev->priv_dev;
 412                 hci = (struct hci_packet *)r->buf;
 413                 cmd_evt = gdm_dev16_to_cpu(&udev->gdm_ed, hci->cmd_evt);
 414
 415                 switch (cmd_evt) {
 416                 case LTE_GET_INFORMATION_RESULT:
 417                         if (set_mac_address(hci->data, r->cb_data) == 0) {
 418                                 ret = r->callback(r->cb_data,
 419                                                   r->buf,
 420                                                   r->urb->actual_length,
 421                                                   KERNEL_THREAD);
 422                         }
 423                         break;
 424
 425                 default:
 426                         if (r->callback) {
 427                                 ret = r->callback(r->cb_data,
 428                                                   r->buf,
 429                                                   r->urb->actual_length,
 430                                                   KERNEL_THREAD);
 431
 432                                 if (ret == -EAGAIN)
 433                                         pr_err("failed to send received data\n");
 434                         }
 435                         break;
 436                 }
 437
 438                 put_rx_struct(rx, r);
 439
 440                 gdm_usb_recv(udev,
 441                              r->callback,
 442                              r->cb_data,
 443                              USB_COMPLETE);
 444         }
 445 }
 446
 447 static void remove_rx_submit_list(struct usb_rx *r, struct rx_cxt *rx)
 448 {
 449         unsigned long flags;
 450         struct usb_rx   *r_remove, *r_remove_next;
 451
 452         spin_lock_irqsave(&rx->submit_lock, flags);
 453         list_for_each_entry_safe(r_remove, r_remove_next,
 454                                  &rx->rx_submit_list, rx_submit_list) {
 455                 if (r == r_remove) {
 456                         list_del(&r->rx_submit_list);
 457                         break;
 458                 }
 459         }
 460         spin_unlock_irqrestore(&rx->submit_lock, flags);
 461 }
 462
 463 static void gdm_usb_rcv_complete(struct urb *urb)
 464 {
 465         struct usb_rx *r = urb->context;
 466         struct rx_cxt *rx = r->rx;
 467         unsigned long flags;
 468         struct lte_udev *udev = container_of(r->rx, struct lte_udev, rx);
 469         struct usb_device *usbdev = udev->usbdev;
 470
 471         remove_rx_submit_list(r, rx);
 472
 473         if (!urb->status && r->callback) {
 474                 spin_lock_irqsave(&rx->to_host_lock, flags);
 475                 list_add_tail(&r->to_host_list, &rx->to_host_list);
 476                 schedule_work(&udev->work_rx.work);
 477                 spin_unlock_irqrestore(&rx->to_host_lock, flags);
 478         } else {
 479                 if (urb->status && udev->usb_state == PM_NORMAL)
 480                         dev_err(&urb->dev->dev, "%s: urb status error %d\n",
 481                                 __func__, urb->status);
 482
 483                 put_rx_struct(rx, r);
 484         }
 485
 486         usb_mark_last_busy(usbdev);
 487 }
 488
 489 static int gdm_usb_recv(void *priv_dev,
 490                         int (*cb)(void *cb_data,
 491                                   void *data, int len, int context),
 492                         void *cb_data,
 493                         int context)
 494 {
 495         struct lte_udev *udev = priv_dev;
 496         struct usb_device *usbdev = udev->usbdev;
 497         struct rx_cxt *rx = &udev->rx;
 498         struct usb_rx *r;
 499         int no_spc;
 500         int ret;
 501         unsigned long flags;
 502
 503         if (!udev->usbdev) {
 504                 pr_err("invalid device\n");
 505                 return -ENODEV;
 506         }
 507
 508         r = get_rx_struct(rx, &no_spc);
 509         if (!r) {
 510                 pr_err("Out of Memory\n");
 511                 return -ENOMEM;
 512         }
 513
 514         udev->rx_cb = cb;
 515         r->callback = cb;
 516         r->cb_data = cb_data;
 517         r->index = (void *)udev;
 518         r->rx = rx;
 519
 520         usb_fill_bulk_urb(r->urb,
 521                           usbdev,
 522                           usb_rcvbulkpipe(usbdev, 0x83),
 523                           r->buf,
 524                           RX_BUF_SIZE,
 525                           gdm_usb_rcv_complete,
 526                           r);
 527
 528         spin_lock_irqsave(&rx->submit_lock, flags);
 529         list_add_tail(&r->rx_submit_list, &rx->rx_submit_list);
 530         spin_unlock_irqrestore(&rx->submit_lock, flags);
 531
 532         if (context == KERNEL_THREAD)
 533                 ret = usb_submit_urb(r->urb, GFP_KERNEL);
 534         else
 535                 ret = usb_submit_urb(r->urb, GFP_ATOMIC);
 536
 537         if (ret) {
 538                 spin_lock_irqsave(&rx->submit_lock, flags);
 539                 list_del(&r->rx_submit_list);
 540                 spin_unlock_irqrestore(&rx->submit_lock, flags);
 541
 542                 pr_err("usb_submit_urb failed (%p)\n", r);
 543                 put_rx_struct(rx, r);
 544         }
 545
 546         return ret;
 547 }
 548
 549 static void gdm_usb_send_complete(struct urb *urb)
 550 {
 551         struct usb_tx *t = urb->context;
 552         struct tx_cxt *tx = t->tx;
 553         struct lte_udev *udev = container_of(tx, struct lte_udev, tx);
 554         unsigned long flags;
 555
 556         if (urb->status == -ECONNRESET) {
 557                 dev_info(&urb->dev->dev, "CONNRESET\n");
 558                 return;
 559         }
 560
 561         if (t->callback)
 562                 t->callback(t->cb_data);
 563
 564         free_tx_struct(t);
 565
 566         spin_lock_irqsave(&tx->lock, flags);
 567         udev->send_complete = 1;
 568         schedule_work(&udev->work_tx.work);
 569         spin_unlock_irqrestore(&tx->lock, flags);
 570 }
 571
 572 static int send_tx_packet(struct usb_device *usbdev, struct usb_tx *t, u32 len)
 573 {
 574         int ret = 0;
 575
 576         if (!(len % 512))
 577                 len++;
 578
 579         usb_fill_bulk_urb(t->urb,
 580                           usbdev,
 581                           usb_sndbulkpipe(usbdev, 2),
 582                           t->buf,
 583                           len,
 584                           gdm_usb_send_complete,
 585                           t);
 586
 587         ret = usb_submit_urb(t->urb, GFP_ATOMIC);
 588
 589         if (ret)
 590                 dev_err(&usbdev->dev, "usb_submit_urb failed: %d\n",
 591                         ret);
 592
 593         usb_mark_last_busy(usbdev);
 594
 595         return ret;
 596 }
 597
 598 static u32 packet_aggregation(struct lte_udev *udev, u8 *send_buf)
 599 {
 600         struct tx_cxt *tx = &udev->tx;
 601         struct usb_tx_sdu *t_sdu = NULL;
 602         struct multi_sdu *multi_sdu = (struct multi_sdu *)send_buf;
 603         u16 send_len = 0;
 604         u16 num_packet = 0;
 605         unsigned long flags;
 606
 607         multi_sdu->cmd_evt = gdm_cpu_to_dev16(&udev->gdm_ed, LTE_TX_MULTI_SDU);
 608
 609         while (num_packet < MAX_PACKET_IN_MULTI_SDU) {
 610                 spin_lock_irqsave(&tx->lock, flags);
 611                 if (list_empty(&tx->sdu_list)) {
 612                         spin_unlock_irqrestore(&tx->lock, flags);
 613                         break;
 614                 }
 615
 616                 t_sdu = list_entry(tx->sdu_list.next, struct usb_tx_sdu, list);
 617                 if (send_len + t_sdu->len > MAX_SDU_SIZE) {
 618                         spin_unlock_irqrestore(&tx->lock, flags);
 619                         break;
 620                 }
 621
 622                 list_del(&t_sdu->list);
 623                 spin_unlock_irqrestore(&tx->lock, flags);
 624
 625                 memcpy(multi_sdu->data + send_len, t_sdu->buf, t_sdu->len);
 626
 627                 send_len += (t_sdu->len + 3) & 0xfffc;
 628                 num_packet++;
 629
 630                 if (tx->avail_count > 10)
 631                         t_sdu->callback(t_sdu->cb_data);
 632
 633                 spin_lock_irqsave(&tx->lock, flags);
 634                 put_tx_struct(tx, t_sdu);
 635                 spin_unlock_irqrestore(&tx->lock, flags);
 636         }
 637
 638         multi_sdu->len = gdm_cpu_to_dev16(&udev->gdm_ed, send_len);
 639         multi_sdu->num_packet = gdm_cpu_to_dev16(&udev->gdm_ed, num_packet);
 640
 641         return send_len + offsetof(struct multi_sdu, data);
 642 }
 643
 644 static void do_tx(struct work_struct *work)
 645 {
 646         struct lte_udev *udev =
 647                 container_of(work, struct lte_udev, work_tx.work);
 648         struct usb_device *usbdev = udev->usbdev;
 649         struct tx_cxt *tx = &udev->tx;
 650         struct usb_tx *t = NULL;
 651         int is_send = 0;
 652         u32 len = 0;
 653         unsigned long flags;
 654
 655         if (!usb_autopm_get_interface(udev->intf))
 656                 usb_autopm_put_interface(udev->intf);
 657
 658         if (udev->usb_state == PM_SUSPEND)
 659                 return;
 660
 661         spin_lock_irqsave(&tx->lock, flags);
 662         if (!udev->send_complete) {
 663                 spin_unlock_irqrestore(&tx->lock, flags);
 664                 return;
 665         }
 666         udev->send_complete = 0;
 667
 668         if (!list_empty(&tx->hci_list)) {
 669                 t = list_entry(tx->hci_list.next, struct usb_tx, list);
 670                 list_del(&t->list);
 671                 len = t->len;
 672                 t->is_sdu = 0;
 673                 is_send = 1;
 674         } else if (!list_empty(&tx->sdu_list)) {
 675                 if (udev->tx_stop) {
 676                         udev->send_complete = 1;
 677                         spin_unlock_irqrestore(&tx->lock, flags);
 678                         return;
 679                 }
 680
 681                 t = alloc_tx_struct(TX_BUF_SIZE);
 682                 if (!t) {
 683                         spin_unlock_irqrestore(&tx->lock, flags);
 684                         return;
 685                 }
 686                 t->callback = NULL;
 687                 t->tx = tx;
 688                 t->is_sdu = 1;
 689                 is_send = 1;
 690         }
 691
 692         if (!is_send) {
 693                 udev->send_complete = 1;
 694                 spin_unlock_irqrestore(&tx->lock, flags);
 695                 return;
 696         }
 697         spin_unlock_irqrestore(&tx->lock, flags);
 698
 699         if (t->is_sdu)
 700                 len = packet_aggregation(udev, t->buf);
 701
 702         if (send_tx_packet(usbdev, t, len)) {
 703                 pr_err("send_tx_packet failed\n");
 704                 t->callback = NULL;
 705                 gdm_usb_send_complete(t->urb);
 706         }
 707 }
 708
 709 #define SDU_PARAM_LEN 12
 710 static int gdm_usb_sdu_send(void *priv_dev, void *data, int len,
 711                             unsigned int dft_eps_ID, unsigned int eps_ID,
 712                             void (*cb)(void *data), void *cb_data,
 713                             int dev_idx, int nic_type)
 714 {
 715         struct lte_udev *udev = priv_dev;
 716         struct tx_cxt *tx = &udev->tx;
 717         struct usb_tx_sdu *t_sdu;
 718         struct sdu *sdu = NULL;
 719         unsigned long flags;
 720         int no_spc = 0;
 721         u16 send_len;
 722
 723         if (!udev->usbdev) {
 724                 pr_err("sdu send - invalid device\n");
 725                 return TX_NO_DEV;
 726         }
 727
 728         spin_lock_irqsave(&tx->lock, flags);
 729         t_sdu = get_tx_sdu_struct(tx, &no_spc);
 730         spin_unlock_irqrestore(&tx->lock, flags);
 731
 732         if (!t_sdu) {
 733                 pr_err("sdu send - free list empty\n");
 734                 return TX_NO_SPC;
 735         }
 736
 737         sdu = (struct sdu *)t_sdu->buf;
 738         sdu->cmd_evt = gdm_cpu_to_dev16(&udev->gdm_ed, LTE_TX_SDU);
 739         if (nic_type == NIC_TYPE_ARP) {
 740                 send_len = len + SDU_PARAM_LEN;
 741             memcpy(sdu->data, data, len);
 742         } else {
 743             send_len = len - ETH_HLEN;
 744             send_len += SDU_PARAM_LEN;
 745             memcpy(sdu->data, data + ETH_HLEN, len - ETH_HLEN);
 746         }
 747
 748         sdu->len = gdm_cpu_to_dev16(&udev->gdm_ed, send_len);
 749         sdu->dft_eps_ID = gdm_cpu_to_dev32(&udev->gdm_ed, dft_eps_ID);
 750         sdu->bearer_ID = gdm_cpu_to_dev32(&udev->gdm_ed, eps_ID);
 751         sdu->nic_type = gdm_cpu_to_dev32(&udev->gdm_ed, nic_type);
 752
 753         t_sdu->len = send_len + HCI_HEADER_SIZE;
 754         t_sdu->callback = cb;
 755         t_sdu->cb_data = cb_data;
 756
 757         spin_lock_irqsave(&tx->lock, flags);
 758         list_add_tail(&t_sdu->list, &tx->sdu_list);
 759         schedule_work(&udev->work_tx.work);
 760         spin_unlock_irqrestore(&tx->lock, flags);
 761
 762         if (no_spc)
 763                 return TX_NO_BUFFER;
 764
 765         return 0;
 766 }
 767
 768 static int gdm_usb_hci_send(void *priv_dev, void *data, int len,
 769                             void (*cb)(void *data), void *cb_data)
 770 {
 771         struct lte_udev *udev = priv_dev;
 772         struct tx_cxt *tx = &udev->tx;
 773         struct usb_tx *t;
 774         unsigned long flags;
 775
 776         if (!udev->usbdev) {
 777                 pr_err("hci send - invalid device\n");
 778                 return -ENODEV;
 779         }
 780
 781         t = alloc_tx_struct(len);
 782         if (!t) {
 783                 pr_err("hci_send - out of memory\n");
 784                 return -ENOMEM;
 785         }
 786
 787         memcpy(t->buf, data, len);
 788         t->callback = cb;
 789         t->cb_data = cb_data;
 790         t->len = len;
 791         t->tx = tx;
 792         t->is_sdu = 0;
 793
 794         spin_lock_irqsave(&tx->lock, flags);
 795         list_add_tail(&t->list, &tx->hci_list);
 796         schedule_work(&udev->work_tx.work);
 797         spin_unlock_irqrestore(&tx->lock, flags);
 798
 799         return 0;
 800 }
 801
 802 static struct gdm_endian *gdm_usb_get_endian(void *priv_dev)
 803 {
 804         struct lte_udev *udev = priv_dev;
 805
 806         return &udev->gdm_ed;
 807 }
 808
 809 static int gdm_usb_probe(struct usb_interface *intf,
 810                          const struct usb_device_id *id)
 811 {
 812         int ret = 0;
 813         struct phy_dev *phy_dev = NULL;
 814         struct lte_udev *udev = NULL;
 815         u16 idVendor, idProduct;
 816         int bInterfaceNumber;
 817         struct usb_device *usbdev = interface_to_usbdev(intf);
 818
 819         bInterfaceNumber = intf->cur_altsetting->desc.bInterfaceNumber;
 820         idVendor = __le16_to_cpu(usbdev->descriptor.idVendor);
 821         idProduct = __le16_to_cpu(usbdev->descriptor.idProduct);
 822
 823         pr_info("net vid = 0x%04x pid = 0x%04x\n", idVendor, idProduct);
 824
 825         if (bInterfaceNumber > NETWORK_INTERFACE) {
 826                 pr_info("not a network device\n");
 827                 return -ENODEV;
 828         }
 829
 830         phy_dev = kzalloc(sizeof(*phy_dev), GFP_KERNEL);
 831         if (!phy_dev)
 832                 return -ENOMEM;
 833
 834         udev = kzalloc(sizeof(*udev), GFP_KERNEL);
 835         if (!udev) {
 836                 ret = -ENOMEM;
 837                 goto err_udev;
 838         }
 839
 840         phy_dev->priv_dev = (void *)udev;
 841         phy_dev->send_hci_func = gdm_usb_hci_send;
 842         phy_dev->send_sdu_func = gdm_usb_sdu_send;
 843         phy_dev->rcv_func = gdm_usb_recv;
 844         phy_dev->get_endian = gdm_usb_get_endian;
 845
 846         udev->usbdev = usbdev;
 847         ret = init_usb(udev);
 848         if (ret < 0) {
 849                 dev_err(intf->usb_dev, "init_usb func failed\n");
 850                 goto err_init_usb;
 851         }
 852         udev->intf = intf;
 853
 854         intf->needs_remote_wakeup = 1;
 855         usb_enable_autosuspend(usbdev);
 856         pm_runtime_set_autosuspend_delay(&usbdev->dev, AUTO_SUSPEND_TIMER);
 857
 858         /* List up hosts with big endians, otherwise,
 859          * defaults to little endian
 860          */
 861         if (idProduct == PID_GDM7243)
 862                 gdm_set_endian(&udev->gdm_ed, ENDIANNESS_BIG);
 863         else
 864                 gdm_set_endian(&udev->gdm_ed, ENDIANNESS_LITTLE);
 865
 866         ret = request_mac_address(udev);
 867         if (ret < 0) {
 868                 dev_err(intf->usb_dev, "request Mac address failed\n");
 869                 goto err_mac_address;
 870         }
 871
 872         start_rx_proc(phy_dev);
 873         usb_get_dev(usbdev);
 874         usb_set_intfdata(intf, phy_dev);
 875
 876         return 0;
 877
 878 err_mac_address:
 879         release_usb(udev);
 880 err_init_usb:
 881         kfree(udev);
 882 err_udev:
 883         kfree(phy_dev);
 884
 885         return ret;
 886 }
 887
 888 static void gdm_usb_disconnect(struct usb_interface *intf)
 889 {
 890         struct phy_dev *phy_dev;
 891         struct lte_udev *udev;
 892         u16 idVendor, idProduct;
 893         struct usb_device *usbdev;
 894
 895         usbdev = interface_to_usbdev(intf);
 896
 897         idVendor = __le16_to_cpu(usbdev->descriptor.idVendor);
 898         idProduct = __le16_to_cpu(usbdev->descriptor.idProduct);
 899
 900         phy_dev = usb_get_intfdata(intf);
 901
 902         udev = phy_dev->priv_dev;
 903         unregister_lte_device(phy_dev);
 904
 905         release_usb(udev);
 906
 907         kfree(udev);
 908         udev = NULL;
 909
 910         kfree(phy_dev);
 911         phy_dev = NULL;
 912
 913         usb_put_dev(usbdev);
 914 }
 915
 916 static int gdm_usb_suspend(struct usb_interface *intf, pm_message_t pm_msg)
 917 {
 918         struct phy_dev *phy_dev;
 919         struct lte_udev *udev;
 920         struct rx_cxt *rx;
 921         struct usb_rx *r;
 922         struct usb_rx *r_next;
 923         unsigned long flags;
 924
 925         phy_dev = usb_get_intfdata(intf);
 926         udev = phy_dev->priv_dev;
 927         rx = &udev->rx;
 928         if (udev->usb_state != PM_NORMAL) {
 929                 dev_err(intf->usb_dev, "usb suspend - invalid state\n");
 930                 return -1;
 931         }
 932
 933         udev->usb_state = PM_SUSPEND;
 934
 935         spin_lock_irqsave(&rx->submit_lock, flags);
 936         list_for_each_entry_safe(r, r_next, &rx->rx_submit_list,
 937                                  rx_submit_list) {
 938                 spin_unlock_irqrestore(&rx->submit_lock, flags);
 939                 usb_kill_urb(r->urb);
 940                 spin_lock_irqsave(&rx->submit_lock, flags);
 941         }
 942         spin_unlock_irqrestore(&rx->submit_lock, flags);
 943
 944         cancel_work_sync(&udev->work_tx.work);
 945         cancel_work_sync(&udev->work_rx.work);
 946
 947         return 0;
 948 }
 949
 950 static int gdm_usb_resume(struct usb_interface *intf)
 951 {
 952         struct phy_dev *phy_dev;
 953         struct lte_udev *udev;
 954         struct tx_cxt *tx;
 955         struct rx_cxt *rx;
 956         unsigned long flags;
 957         int issue_count;
 958         int i;
 959
 960         phy_dev = usb_get_intfdata(intf);
 961         udev = phy_dev->priv_dev;
 962         rx = &udev->rx;
 963
 964         if (udev->usb_state != PM_SUSPEND) {
 965                 dev_err(intf->usb_dev, "usb resume - invalid state\n");
 966                 return -1;
 967         }
 968         udev->usb_state = PM_NORMAL;
 969
 970         spin_lock_irqsave(&rx->rx_lock, flags);
 971         issue_count = rx->avail_count - MAX_RX_SUBMIT_COUNT;
 972         spin_unlock_irqrestore(&rx->rx_lock, flags);
 973
 974         if (issue_count >= 0) {
 975                 for (i = 0; i < issue_count; i++)
 976                         gdm_usb_recv(phy_dev->priv_dev,
 977                                      udev->rx_cb,
 978                                      phy_dev,
 979                                      USB_COMPLETE);
 980         }
 981
 982         tx = &udev->tx;
 983         spin_lock_irqsave(&tx->lock, flags);
 984         schedule_work(&udev->work_tx.work);
 985         spin_unlock_irqrestore(&tx->lock, flags);
 986
 987         return 0;
 988 }
 989
 990 static struct usb_driver gdm_usb_lte_driver = {
 991         .name = "gdm_lte",
 992         .probe = gdm_usb_probe,
 993         .disconnect = gdm_usb_disconnect,
 994         .id_table = id_table,
 995         .supports_autosuspend = 1,
 996         .suspend = gdm_usb_suspend,
 997         .resume = gdm_usb_resume,
 998         .reset_resume = gdm_usb_resume,
 999 };
1000
1001 static int __init gdm_usb_lte_init(void)
1002 {
1003         if (gdm_lte_event_init() < 0) {
1004                 pr_err("error creating event\n");
1005                 return -1;
1006         }
1007
1008         return usb_register(&gdm_usb_lte_driver);
1009 }
1010
1011 static void __exit gdm_usb_lte_exit(void)
1012 {
1013         gdm_lte_event_exit();
1014
1015         usb_deregister(&gdm_usb_lte_driver);
1016 }
1017
1018 module_init(gdm_usb_lte_init);
1019 module_exit(gdm_usb_lte_exit);
1020
1021 MODULE_VERSION(DRIVER_VERSION);
1022 MODULE_DESCRIPTION("GCT LTE USB Device Driver");
1023 MODULE_LICENSE("GPL");