drivers/net/wireless/zd1211rw/zd_usb.c

   1 /* zd_usb.c
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   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  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  16  */
  17
  18 #include <asm/unaligned.h>
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/module.h>
  22 #include <linux/firmware.h>
  23 #include <linux/device.h>
  24 #include <linux/errno.h>
  25 #include <linux/skbuff.h>
  26 #include <linux/usb.h>
  27 #include <net/ieee80211.h>
  28
  29 #include "zd_def.h"
  30 #include "zd_netdev.h"
  31 #include "zd_mac.h"
  32 #include "zd_usb.h"
  33 #include "zd_util.h"
  34
  35 static struct usb_device_id usb_ids[] = {
  36         /* ZD1211 */
  37         { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
  38         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
  39         { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
  40         { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
  41         { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
  42         { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
  43         { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
  44         { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
  45         { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
  46         { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
  47         /* ZD1211B */
  48         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  49         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  50         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  51         {}
  52 };
  53
  54 MODULE_LICENSE("GPL");
  55 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
  56 MODULE_AUTHOR("Ulrich Kunitz");
  57 MODULE_AUTHOR("Daniel Drake");
  58 MODULE_VERSION("1.0");
  59 MODULE_DEVICE_TABLE(usb, usb_ids);
  60
  61 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
  62 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
  63
  64 /* register address handling */
  65
  66 #ifdef DEBUG
  67 static int check_addr(struct zd_usb *usb, zd_addr_t addr)
  68 {
  69         u32 base = ZD_ADDR_BASE(addr);
  70         u32 offset = ZD_OFFSET(addr);
  71
  72         if ((u32)addr & ADDR_ZERO_MASK)
  73                 goto invalid_address;
  74         switch (base) {
  75         case USB_BASE:
  76                 break;
  77         case CR_BASE:
  78                 if (offset > CR_MAX_OFFSET) {
  79                         dev_dbg(zd_usb_dev(usb),
  80                                 "CR offset %#010x larger than"
  81                                 " CR_MAX_OFFSET %#10x\n",
  82                                 offset, CR_MAX_OFFSET);
  83                         goto invalid_address;
  84                 }
  85                 if (offset & 1) {
  86                         dev_dbg(zd_usb_dev(usb),
  87                                 "CR offset %#010x is not a multiple of 2\n",
  88                                 offset);
  89                         goto invalid_address;
  90                 }
  91                 break;
  92         case E2P_BASE:
  93                 if (offset > E2P_MAX_OFFSET) {
  94                         dev_dbg(zd_usb_dev(usb),
  95                                 "E2P offset %#010x larger than"
  96                                 " E2P_MAX_OFFSET %#010x\n",
  97                                 offset, E2P_MAX_OFFSET);
  98                         goto invalid_address;
  99                 }
 100                 break;
 101         case FW_BASE:
 102                 if (!usb->fw_base_offset) {
 103                         dev_dbg(zd_usb_dev(usb),
 104                                "ERROR: fw base offset has not been set\n");
 105                         return -EAGAIN;
 106                 }
 107                 if (offset > FW_MAX_OFFSET) {
 108                         dev_dbg(zd_usb_dev(usb),
 109                                 "FW offset %#10x is larger than"
 110                                 " FW_MAX_OFFSET %#010x\n",
 111                                 offset, FW_MAX_OFFSET);
 112                         goto invalid_address;
 113                 }
 114                 break;
 115         default:
 116                 dev_dbg(zd_usb_dev(usb),
 117                         "address has unsupported base %#010x\n", addr);
 118                 goto invalid_address;
 119         }
 120
 121         return 0;
 122 invalid_address:
 123         dev_dbg(zd_usb_dev(usb),
 124                 "ERROR: invalid address: %#010x\n", addr);
 125         return -EINVAL;
 126 }
 127 #endif /* DEBUG */
 128
 129 static u16 usb_addr(struct zd_usb *usb, zd_addr_t addr)
 130 {
 131         u32 base;
 132         u16 offset;
 133
 134         base = ZD_ADDR_BASE(addr);
 135         offset = ZD_OFFSET(addr);
 136
 137         ZD_ASSERT(check_addr(usb, addr) == 0);
 138
 139         switch (base) {
 140         case CR_BASE:
 141                 offset += CR_BASE_OFFSET;
 142                 break;
 143         case E2P_BASE:
 144                 offset += E2P_BASE_OFFSET;
 145                 break;
 146         case FW_BASE:
 147                 offset += usb->fw_base_offset;
 148                 break;
 149         }
 150
 151         return offset;
 152 }
 153
 154 /* USB device initialization */
 155
 156 static int request_fw_file(
 157         const struct firmware **fw, const char *name, struct device *device)
 158 {
 159         int r;
 160
 161         dev_dbg_f(device, "fw name %s\n", name);
 162
 163         r = request_firmware(fw, name, device);
 164         if (r)
 165                 dev_err(device,
 166                        "Could not load firmware file %s. Error number %d\n",
 167                        name, r);
 168         return r;
 169 }
 170
 171 static inline u16 get_bcdDevice(const struct usb_device *udev)
 172 {
 173         return le16_to_cpu(udev->descriptor.bcdDevice);
 174 }
 175
 176 enum upload_code_flags {
 177         REBOOT = 1,
 178 };
 179
 180 /* Ensures that MAX_TRANSFER_SIZE is even. */
 181 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 182
 183 static int upload_code(struct usb_device *udev,
 184         const u8 *data, size_t size, u16 code_offset, int flags)
 185 {
 186         u8 *p;
 187         int r;
 188
 189         /* USB request blocks need "kmalloced" buffers.
 190          */
 191         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 192         if (!p) {
 193                 dev_err(&udev->dev, "out of memory\n");
 194                 r = -ENOMEM;
 195                 goto error;
 196         }
 197
 198         size &= ~1;
 199         while (size > 0) {
 200                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 201                         size : MAX_TRANSFER_SIZE;
 202
 203                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 204
 205                 memcpy(p, data, transfer_size);
 206                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 207                         USB_REQ_FIRMWARE_DOWNLOAD,
 208                         USB_DIR_OUT | USB_TYPE_VENDOR,
 209                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 210                 if (r < 0) {
 211                         dev_err(&udev->dev,
 212                                "USB control request for firmware upload"
 213                                " failed. Error number %d\n", r);
 214                         goto error;
 215                 }
 216                 transfer_size = r & ~1;
 217
 218                 size -= transfer_size;
 219                 data += transfer_size;
 220                 code_offset += transfer_size/sizeof(u16);
 221         }
 222
 223         if (flags & REBOOT) {
 224                 u8 ret;
 225
 226                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 227                         USB_REQ_FIRMWARE_CONFIRM,
 228                         USB_DIR_IN | USB_TYPE_VENDOR,
 229                         0, 0, &ret, sizeof(ret), 5000 /* ms */);
 230                 if (r != sizeof(ret)) {
 231                         dev_err(&udev->dev,
 232                                 "control request firmeware confirmation failed."
 233                                 " Return value %d\n", r);
 234                         if (r >= 0)
 235                                 r = -ENODEV;
 236                         goto error;
 237                 }
 238                 if (ret & 0x80) {
 239                         dev_err(&udev->dev,
 240                                 "Internal error while downloading."
 241                                 " Firmware confirm return value %#04x\n",
 242                                 (unsigned int)ret);
 243                         r = -ENODEV;
 244                         goto error;
 245                 }
 246                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 247                         (unsigned int)ret);
 248         }
 249
 250         r = 0;
 251 error:
 252         kfree(p);
 253         return r;
 254 }
 255
 256 static u16 get_word(const void *data, u16 offset)
 257 {
 258         const __le16 *p = data;
 259         return le16_to_cpu(p[offset]);
 260 }
 261
 262 static char *get_fw_name(char *buffer, size_t size, u8 device_type,
 263                        const char* postfix)
 264 {
 265         scnprintf(buffer, size, "%s%s",
 266                 device_type == DEVICE_ZD1211B ?
 267                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 268                 postfix);
 269         return buffer;
 270 }
 271
 272 static int handle_version_mismatch(struct usb_device *udev, u8 device_type,
 273         const struct firmware *ub_fw)
 274 {
 275         const struct firmware *ur_fw = NULL;
 276         int offset;
 277         int r = 0;
 278         char fw_name[128];
 279
 280         r = request_fw_file(&ur_fw,
 281                 get_fw_name(fw_name, sizeof(fw_name), device_type, "ur"),
 282                 &udev->dev);
 283         if (r)
 284                 goto error;
 285
 286         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START_OFFSET,
 287                 REBOOT);
 288         if (r)
 289                 goto error;
 290
 291         offset = ((EEPROM_REGS_OFFSET + EEPROM_REGS_SIZE) * sizeof(u16));
 292         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
 293                 E2P_BASE_OFFSET + EEPROM_REGS_SIZE, REBOOT);
 294
 295         /* At this point, the vendor driver downloads the whole firmware
 296          * image, hacks around with version IDs, and uploads it again,
 297          * completely overwriting the boot code. We do not do this here as
 298          * it is not required on any tested devices, and it is suspected to
 299          * cause problems. */
 300 error:
 301         release_firmware(ur_fw);
 302         return r;
 303 }
 304
 305 static int upload_firmware(struct usb_device *udev, u8 device_type)
 306 {
 307         int r;
 308         u16 fw_bcdDevice;
 309         u16 bcdDevice;
 310         const struct firmware *ub_fw = NULL;
 311         const struct firmware *uph_fw = NULL;
 312         char fw_name[128];
 313
 314         bcdDevice = get_bcdDevice(udev);
 315
 316         r = request_fw_file(&ub_fw,
 317                 get_fw_name(fw_name, sizeof(fw_name), device_type,  "ub"),
 318                 &udev->dev);
 319         if (r)
 320                 goto error;
 321
 322         fw_bcdDevice = get_word(ub_fw->data, EEPROM_REGS_OFFSET);
 323
 324         if (fw_bcdDevice != bcdDevice) {
 325                 dev_info(&udev->dev,
 326                         "firmware version %#06x and device bootcode version "
 327                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
 328                 if (bcdDevice <= 0x4313)
 329                         dev_warn(&udev->dev, "device has old bootcode, please "
 330                                 "report success or failure\n");
 331
 332                 r = handle_version_mismatch(udev, device_type, ub_fw);
 333                 if (r)
 334                         goto error;
 335         } else {
 336                 dev_dbg_f(&udev->dev,
 337                         "firmware device id %#06x is equal to the "
 338                         "actual device id\n", fw_bcdDevice);
 339         }
 340
 341
 342         r = request_fw_file(&uph_fw,
 343                 get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"),
 344                 &udev->dev);
 345         if (r)
 346                 goto error;
 347
 348         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START_OFFSET,
 349                         REBOOT);
 350         if (r) {
 351                 dev_err(&udev->dev,
 352                         "Could not upload firmware code uph. Error number %d\n",
 353                         r);
 354         }
 355
 356         /* FALL-THROUGH */
 357 error:
 358         release_firmware(ub_fw);
 359         release_firmware(uph_fw);
 360         return r;
 361 }
 362
 363 static void disable_read_regs_int(struct zd_usb *usb)
 364 {
 365         struct zd_usb_interrupt *intr = &usb->intr;
 366
 367         spin_lock(&intr->lock);
 368         intr->read_regs_enabled = 0;
 369         spin_unlock(&intr->lock);
 370 }
 371
 372 #define urb_dev(urb) (&(urb)->dev->dev)
 373
 374 static inline void handle_regs_int(struct urb *urb)
 375 {
 376         struct zd_usb *usb = urb->context;
 377         struct zd_usb_interrupt *intr = &usb->intr;
 378         int len;
 379
 380         ZD_ASSERT(in_interrupt());
 381         spin_lock(&intr->lock);
 382
 383         if (intr->read_regs_enabled) {
 384                 intr->read_regs.length = len = urb->actual_length;
 385
 386                 if (len > sizeof(intr->read_regs.buffer))
 387                         len = sizeof(intr->read_regs.buffer);
 388                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 389                 intr->read_regs_enabled = 0;
 390                 complete(&intr->read_regs.completion);
 391                 goto out;
 392         }
 393
 394         dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
 395 out:
 396         spin_unlock(&intr->lock);
 397 }
 398
 399 static inline void handle_retry_failed_int(struct urb *urb)
 400 {
 401         dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
 402 }
 403
 404
 405 static void int_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
 406 {
 407         int r;
 408         struct usb_int_header *hdr;
 409
 410         switch (urb->status) {
 411         case 0:
 412                 break;
 413         case -ESHUTDOWN:
 414         case -EINVAL:
 415         case -ENODEV:
 416         case -ENOENT:
 417         case -ECONNRESET:
 418         case -EPIPE:
 419                 goto kfree;
 420         default:
 421                 goto resubmit;
 422         }
 423
 424         if (urb->actual_length < sizeof(hdr)) {
 425                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 426                 goto resubmit;
 427         }
 428
 429         hdr = urb->transfer_buffer;
 430         if (hdr->type != USB_INT_TYPE) {
 431                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 432                 goto resubmit;
 433         }
 434
 435         switch (hdr->id) {
 436         case USB_INT_ID_REGS:
 437                 handle_regs_int(urb);
 438                 break;
 439         case USB_INT_ID_RETRY_FAILED:
 440                 handle_retry_failed_int(urb);
 441                 break;
 442         default:
 443                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 444                         (unsigned int)hdr->id);
 445                 goto resubmit;
 446         }
 447
 448 resubmit:
 449         r = usb_submit_urb(urb, GFP_ATOMIC);
 450         if (r) {
 451                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
 452                 goto kfree;
 453         }
 454         return;
 455 kfree:
 456         kfree(urb->transfer_buffer);
 457 }
 458
 459 static inline int int_urb_interval(struct usb_device *udev)
 460 {
 461         switch (udev->speed) {
 462         case USB_SPEED_HIGH:
 463                 return 4;
 464         case USB_SPEED_LOW:
 465                 return 10;
 466         case USB_SPEED_FULL:
 467         default:
 468                 return 1;
 469         }
 470 }
 471
 472 static inline int usb_int_enabled(struct zd_usb *usb)
 473 {
 474         unsigned long flags;
 475         struct zd_usb_interrupt *intr = &usb->intr;
 476         struct urb *urb;
 477
 478         spin_lock_irqsave(&intr->lock, flags);
 479         urb = intr->urb;
 480         spin_unlock_irqrestore(&intr->lock, flags);
 481         return urb != NULL;
 482 }
 483
 484 int zd_usb_enable_int(struct zd_usb *usb)
 485 {
 486         int r;
 487         struct usb_device *udev;
 488         struct zd_usb_interrupt *intr = &usb->intr;
 489         void *transfer_buffer = NULL;
 490         struct urb *urb;
 491
 492         dev_dbg_f(zd_usb_dev(usb), "\n");
 493
 494         urb = usb_alloc_urb(0, GFP_NOFS);
 495         if (!urb) {
 496                 r = -ENOMEM;
 497                 goto out;
 498         }
 499
 500         ZD_ASSERT(!irqs_disabled());
 501         spin_lock_irq(&intr->lock);
 502         if (intr->urb) {
 503                 spin_unlock_irq(&intr->lock);
 504                 r = 0;
 505                 goto error_free_urb;
 506         }
 507         intr->urb = urb;
 508         spin_unlock_irq(&intr->lock);
 509
 510         /* TODO: make it a DMA buffer */
 511         r = -ENOMEM;
 512         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_NOFS);
 513         if (!transfer_buffer) {
 514                 dev_dbg_f(zd_usb_dev(usb),
 515                         "couldn't allocate transfer_buffer\n");
 516                 goto error_set_urb_null;
 517         }
 518
 519         udev = zd_usb_to_usbdev(usb);
 520         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 521                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
 522                          int_urb_complete, usb,
 523                          intr->interval);
 524
 525         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 526         r = usb_submit_urb(urb, GFP_NOFS);
 527         if (r) {
 528                 dev_dbg_f(zd_usb_dev(usb),
 529                          "Couldn't submit urb. Error number %d\n", r);
 530                 goto error;
 531         }
 532
 533         return 0;
 534 error:
 535         kfree(transfer_buffer);
 536 error_set_urb_null:
 537         spin_lock_irq(&intr->lock);
 538         intr->urb = NULL;
 539         spin_unlock_irq(&intr->lock);
 540 error_free_urb:
 541         usb_free_urb(urb);
 542 out:
 543         return r;
 544 }
 545
 546 void zd_usb_disable_int(struct zd_usb *usb)
 547 {
 548         unsigned long flags;
 549         struct zd_usb_interrupt *intr = &usb->intr;
 550         struct urb *urb;
 551
 552         spin_lock_irqsave(&intr->lock, flags);
 553         urb = intr->urb;
 554         if (!urb) {
 555                 spin_unlock_irqrestore(&intr->lock, flags);
 556                 return;
 557         }
 558         intr->urb = NULL;
 559         spin_unlock_irqrestore(&intr->lock, flags);
 560
 561         usb_kill_urb(urb);
 562         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 563         usb_free_urb(urb);
 564 }
 565
 566 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 567                              unsigned int length)
 568 {
 569         int i;
 570         struct zd_mac *mac = zd_usb_to_mac(usb);
 571         const struct rx_length_info *length_info;
 572
 573         if (length < sizeof(struct rx_length_info)) {
 574                 /* It's not a complete packet anyhow. */
 575                 return;
 576         }
 577         length_info = (struct rx_length_info *)
 578                 (buffer + length - sizeof(struct rx_length_info));
 579
 580         /* It might be that three frames are merged into a single URB
 581          * transaction. We have to check for the length info tag.
 582          *
 583          * While testing we discovered that length_info might be unaligned,
 584          * because if USB transactions are merged, the last packet will not
 585          * be padded. Unaligned access might also happen if the length_info
 586          * structure is not present.
 587          */
 588         if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
 589         {
 590                 unsigned int l, k, n;
 591                 for (i = 0, l = 0;; i++) {
 592                         k = le16_to_cpu(get_unaligned(&length_info->length[i]));
 593                         n = l+k;
 594                         if (n > length)
 595                                 return;
 596                         zd_mac_rx(mac, buffer+l, k);
 597                         if (i >= 2)
 598                                 return;
 599                         l = (n+3) & ~3;
 600                 }
 601         } else {
 602                 zd_mac_rx(mac, buffer, length);
 603         }
 604 }
 605
 606 static void rx_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
 607 {
 608         struct zd_usb *usb;
 609         struct zd_usb_rx *rx;
 610         const u8 *buffer;
 611         unsigned int length;
 612
 613         switch (urb->status) {
 614         case 0:
 615                 break;
 616         case -ESHUTDOWN:
 617         case -EINVAL:
 618         case -ENODEV:
 619         case -ENOENT:
 620         case -ECONNRESET:
 621         case -EPIPE:
 622                 return;
 623         default:
 624                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 625                 goto resubmit;
 626         }
 627
 628         buffer = urb->transfer_buffer;
 629         length = urb->actual_length;
 630         usb = urb->context;
 631         rx = &usb->rx;
 632
 633         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 634                 /* If there is an old first fragment, we don't care. */
 635                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 636                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 637                 spin_lock(&rx->lock);
 638                 memcpy(rx->fragment, buffer, length);
 639                 rx->fragment_length = length;
 640                 spin_unlock(&rx->lock);
 641                 goto resubmit;
 642         }
 643
 644         spin_lock(&rx->lock);
 645         if (rx->fragment_length > 0) {
 646                 /* We are on a second fragment, we believe */
 647                 ZD_ASSERT(length + rx->fragment_length <=
 648                           ARRAY_SIZE(rx->fragment));
 649                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 650                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 651                 handle_rx_packet(usb, rx->fragment,
 652                                  rx->fragment_length + length);
 653                 rx->fragment_length = 0;
 654                 spin_unlock(&rx->lock);
 655         } else {
 656                 spin_unlock(&rx->lock);
 657                 handle_rx_packet(usb, buffer, length);
 658         }
 659
 660 resubmit:
 661         usb_submit_urb(urb, GFP_ATOMIC);
 662 }
 663
 664 struct urb *alloc_urb(struct zd_usb *usb)
 665 {
 666         struct usb_device *udev = zd_usb_to_usbdev(usb);
 667         struct urb *urb;
 668         void *buffer;
 669
 670         urb = usb_alloc_urb(0, GFP_NOFS);
 671         if (!urb)
 672                 return NULL;
 673         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_NOFS,
 674                                   &urb->transfer_dma);
 675         if (!buffer) {
 676                 usb_free_urb(urb);
 677                 return NULL;
 678         }
 679
 680         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 681                           buffer, USB_MAX_RX_SIZE,
 682                           rx_urb_complete, usb);
 683         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 684
 685         return urb;
 686 }
 687
 688 void free_urb(struct urb *urb)
 689 {
 690         if (!urb)
 691                 return;
 692         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 693                         urb->transfer_buffer, urb->transfer_dma);
 694         usb_free_urb(urb);
 695 }
 696
 697 int zd_usb_enable_rx(struct zd_usb *usb)
 698 {
 699         int i, r;
 700         struct zd_usb_rx *rx = &usb->rx;
 701         struct urb **urbs;
 702
 703         dev_dbg_f(zd_usb_dev(usb), "\n");
 704
 705         r = -ENOMEM;
 706         urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_NOFS);
 707         if (!urbs)
 708                 goto error;
 709         for (i = 0; i < URBS_COUNT; i++) {
 710                 urbs[i] = alloc_urb(usb);
 711                 if (!urbs[i])
 712                         goto error;
 713         }
 714
 715         ZD_ASSERT(!irqs_disabled());
 716         spin_lock_irq(&rx->lock);
 717         if (rx->urbs) {
 718                 spin_unlock_irq(&rx->lock);
 719                 r = 0;
 720                 goto error;
 721         }
 722         rx->urbs = urbs;
 723         rx->urbs_count = URBS_COUNT;
 724         spin_unlock_irq(&rx->lock);
 725
 726         for (i = 0; i < URBS_COUNT; i++) {
 727                 r = usb_submit_urb(urbs[i], GFP_NOFS);
 728                 if (r)
 729                         goto error_submit;
 730         }
 731
 732         return 0;
 733 error_submit:
 734         for (i = 0; i < URBS_COUNT; i++) {
 735                 usb_kill_urb(urbs[i]);
 736         }
 737         spin_lock_irq(&rx->lock);
 738         rx->urbs = NULL;
 739         rx->urbs_count = 0;
 740         spin_unlock_irq(&rx->lock);
 741 error:
 742         if (urbs) {
 743                 for (i = 0; i < URBS_COUNT; i++)
 744                         free_urb(urbs[i]);
 745         }
 746         return r;
 747 }
 748
 749 void zd_usb_disable_rx(struct zd_usb *usb)
 750 {
 751         int i;
 752         unsigned long flags;
 753         struct urb **urbs;
 754         unsigned int count;
 755         struct zd_usb_rx *rx = &usb->rx;
 756
 757         spin_lock_irqsave(&rx->lock, flags);
 758         urbs = rx->urbs;
 759         count = rx->urbs_count;
 760         spin_unlock_irqrestore(&rx->lock, flags);
 761         if (!urbs)
 762                 return;
 763
 764         for (i = 0; i < count; i++) {
 765                 usb_kill_urb(urbs[i]);
 766                 free_urb(urbs[i]);
 767         }
 768         kfree(urbs);
 769
 770         spin_lock_irqsave(&rx->lock, flags);
 771         rx->urbs = NULL;
 772         rx->urbs_count = 0;
 773         spin_unlock_irqrestore(&rx->lock, flags);
 774 }
 775
 776 static void tx_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
 777 {
 778         int r;
 779
 780         switch (urb->status) {
 781         case 0:
 782                 break;
 783         case -ESHUTDOWN:
 784         case -EINVAL:
 785         case -ENODEV:
 786         case -ENOENT:
 787         case -ECONNRESET:
 788         case -EPIPE:
 789                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 790                 break;
 791         default:
 792                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 793                 goto resubmit;
 794         }
 795 free_urb:
 796         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 797                         urb->transfer_buffer, urb->transfer_dma);
 798         usb_free_urb(urb);
 799         return;
 800 resubmit:
 801         r = usb_submit_urb(urb, GFP_ATOMIC);
 802         if (r) {
 803                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 804                 goto free_urb;
 805         }
 806 }
 807
 808 /* Puts the frame on the USB endpoint. It doesn't wait for
 809  * completion. The frame must contain the control set.
 810  */
 811 int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
 812 {
 813         int r;
 814         struct usb_device *udev = zd_usb_to_usbdev(usb);
 815         struct urb *urb;
 816         void *buffer;
 817
 818         urb = usb_alloc_urb(0, GFP_ATOMIC);
 819         if (!urb) {
 820                 r = -ENOMEM;
 821                 goto out;
 822         }
 823
 824         buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
 825                                   &urb->transfer_dma);
 826         if (!buffer) {
 827                 r = -ENOMEM;
 828                 goto error_free_urb;
 829         }
 830         memcpy(buffer, frame, length);
 831
 832         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 833                           buffer, length, tx_urb_complete, NULL);
 834         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 835
 836         r = usb_submit_urb(urb, GFP_ATOMIC);
 837         if (r)
 838                 goto error;
 839         return 0;
 840 error:
 841         usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
 842                         urb->transfer_dma);
 843 error_free_urb:
 844         usb_free_urb(urb);
 845 out:
 846         return r;
 847 }
 848
 849 static inline void init_usb_interrupt(struct zd_usb *usb)
 850 {
 851         struct zd_usb_interrupt *intr = &usb->intr;
 852
 853         spin_lock_init(&intr->lock);
 854         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 855         init_completion(&intr->read_regs.completion);
 856         intr->read_regs.cr_int_addr = cpu_to_le16(usb_addr(usb, CR_INTERRUPT));
 857 }
 858
 859 static inline void init_usb_rx(struct zd_usb *usb)
 860 {
 861         struct zd_usb_rx *rx = &usb->rx;
 862         spin_lock_init(&rx->lock);
 863         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 864                 rx->usb_packet_size = 512;
 865         } else {
 866                 rx->usb_packet_size = 64;
 867         }
 868         ZD_ASSERT(rx->fragment_length == 0);
 869 }
 870
 871 static inline void init_usb_tx(struct zd_usb *usb)
 872 {
 873         /* FIXME: at this point we will allocate a fixed number of urb's for
 874          * use in a cyclic scheme */
 875 }
 876
 877 void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
 878                  struct usb_interface *intf)
 879 {
 880         memset(usb, 0, sizeof(*usb));
 881         usb->intf = usb_get_intf(intf);
 882         usb_set_intfdata(usb->intf, netdev);
 883         init_usb_interrupt(usb);
 884         init_usb_tx(usb);
 885         init_usb_rx(usb);
 886 }
 887
 888 int zd_usb_init_hw(struct zd_usb *usb)
 889 {
 890         int r;
 891         struct zd_chip *chip = zd_usb_to_chip(usb);
 892
 893         ZD_ASSERT(mutex_is_locked(&chip->mutex));
 894         r = zd_ioread16_locked(chip, &usb->fw_base_offset,
 895                         USB_REG((u16)FW_BASE_ADDR_OFFSET));
 896         if (r)
 897                 return r;
 898         dev_dbg_f(zd_usb_dev(usb), "fw_base_offset: %#06hx\n",
 899                  usb->fw_base_offset);
 900
 901         return 0;
 902 }
 903
 904 void zd_usb_clear(struct zd_usb *usb)
 905 {
 906         usb_set_intfdata(usb->intf, NULL);
 907         usb_put_intf(usb->intf);
 908         memset(usb, 0, sizeof(*usb));
 909         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
 910 }
 911
 912 static const char *speed(enum usb_device_speed speed)
 913 {
 914         switch (speed) {
 915         case USB_SPEED_LOW:
 916                 return "low";
 917         case USB_SPEED_FULL:
 918                 return "full";
 919         case USB_SPEED_HIGH:
 920                 return "high";
 921         default:
 922                 return "unknown speed";
 923         }
 924 }
 925
 926 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
 927 {
 928         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
 929                 le16_to_cpu(udev->descriptor.idVendor),
 930                 le16_to_cpu(udev->descriptor.idProduct),
 931                 get_bcdDevice(udev),
 932                 speed(udev->speed));
 933 }
 934
 935 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
 936 {
 937         struct usb_device *udev = interface_to_usbdev(usb->intf);
 938         return scnprint_id(udev, buffer, size);
 939 }
 940
 941 #ifdef DEBUG
 942 static void print_id(struct usb_device *udev)
 943 {
 944         char buffer[40];
 945
 946         scnprint_id(udev, buffer, sizeof(buffer));
 947         buffer[sizeof(buffer)-1] = 0;
 948         dev_dbg_f(&udev->dev, "%s\n", buffer);
 949 }
 950 #else
 951 #define print_id(udev) do { } while (0)
 952 #endif
 953
 954 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
 955 {
 956         int r;
 957         struct usb_device *udev = interface_to_usbdev(intf);
 958         struct net_device *netdev = NULL;
 959
 960         print_id(udev);
 961
 962         switch (udev->speed) {
 963         case USB_SPEED_LOW:
 964         case USB_SPEED_FULL:
 965         case USB_SPEED_HIGH:
 966                 break;
 967         default:
 968                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
 969                 r = -ENODEV;
 970                 goto error;
 971         }
 972
 973         netdev = zd_netdev_alloc(intf);
 974         if (netdev == NULL) {
 975                 r = -ENOMEM;
 976                 goto error;
 977         }
 978
 979         r = upload_firmware(udev, id->driver_info);
 980         if (r) {
 981                 dev_err(&intf->dev,
 982                        "couldn't load firmware. Error number %d\n", r);
 983                 goto error;
 984         }
 985
 986         r = usb_reset_configuration(udev);
 987         if (r) {
 988                 dev_dbg_f(&intf->dev,
 989                         "couldn't reset configuration. Error number %d\n", r);
 990                 goto error;
 991         }
 992
 993         /* At this point the interrupt endpoint is not generally enabled. We
 994          * save the USB bandwidth until the network device is opened. But
 995          * notify that the initialization of the MAC will require the
 996          * interrupts to be temporary enabled.
 997          */
 998         r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
 999         if (r) {
1000                 dev_dbg_f(&intf->dev,
1001                          "couldn't initialize mac. Error number %d\n", r);
1002                 goto error;
1003         }
1004
1005         r = register_netdev(netdev);
1006         if (r) {
1007                 dev_dbg_f(&intf->dev,
1008                          "couldn't register netdev. Error number %d\n", r);
1009                 goto error;
1010         }
1011
1012         dev_dbg_f(&intf->dev, "successful\n");
1013         dev_info(&intf->dev,"%s\n", netdev->name);
1014         return 0;
1015 error:
1016         usb_reset_device(interface_to_usbdev(intf));
1017         zd_netdev_free(netdev);
1018         return r;
1019 }
1020
1021 static void disconnect(struct usb_interface *intf)
1022 {
1023         struct net_device *netdev = zd_intf_to_netdev(intf);
1024         struct zd_mac *mac = zd_netdev_mac(netdev);
1025         struct zd_usb *usb = &mac->chip.usb;
1026
1027         dev_dbg_f(zd_usb_dev(usb), "\n");
1028
1029         zd_netdev_disconnect(netdev);
1030
1031         /* Just in case something has gone wrong! */
1032         zd_usb_disable_rx(usb);
1033         zd_usb_disable_int(usb);
1034
1035         /* If the disconnect has been caused by a removal of the
1036          * driver module, the reset allows reloading of the driver. If the
1037          * reset will not be executed here, the upload of the firmware in the
1038          * probe function caused by the reloading of the driver will fail.
1039          */
1040         usb_reset_device(interface_to_usbdev(intf));
1041
1042         /* If somebody still waits on this lock now, this is an error. */
1043         zd_netdev_free(netdev);
1044         dev_dbg(&intf->dev, "disconnected\n");
1045 }
1046
1047 static struct usb_driver driver = {
1048         .name           = "zd1211rw",
1049         .id_table       = usb_ids,
1050         .probe          = probe,
1051         .disconnect     = disconnect,
1052 };
1053
1054 static int __init usb_init(void)
1055 {
1056         int r;
1057
1058         pr_debug("usb_init()\n");
1059
1060         r = usb_register(&driver);
1061         if (r) {
1062                 printk(KERN_ERR "usb_register() failed. Error number %d\n", r);
1063                 return r;
1064         }
1065
1066         pr_debug("zd1211rw initialized\n");
1067         return 0;
1068 }
1069
1070 static void __exit usb_exit(void)
1071 {
1072         pr_debug("usb_exit()\n");
1073         usb_deregister(&driver);
1074 }
1075
1076 module_init(usb_init);
1077 module_exit(usb_exit);
1078
1079 static int usb_int_regs_length(unsigned int count)
1080 {
1081         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1082 }
1083
1084 static void prepare_read_regs_int(struct zd_usb *usb)
1085 {
1086         struct zd_usb_interrupt *intr = &usb->intr;
1087
1088         spin_lock(&intr->lock);
1089         intr->read_regs_enabled = 1;
1090         INIT_COMPLETION(intr->read_regs.completion);
1091         spin_unlock(&intr->lock);
1092 }
1093
1094 static int get_results(struct zd_usb *usb, u16 *values,
1095                        struct usb_req_read_regs *req, unsigned int count)
1096 {
1097         int r;
1098         int i;
1099         struct zd_usb_interrupt *intr = &usb->intr;
1100         struct read_regs_int *rr = &intr->read_regs;
1101         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1102
1103         spin_lock(&intr->lock);
1104
1105         r = -EIO;
1106         /* The created block size seems to be larger than expected.
1107          * However results appear to be correct.
1108          */
1109         if (rr->length < usb_int_regs_length(count)) {
1110                 dev_dbg_f(zd_usb_dev(usb),
1111                          "error: actual length %d less than expected %d\n",
1112                          rr->length, usb_int_regs_length(count));
1113                 goto error_unlock;
1114         }
1115         if (rr->length > sizeof(rr->buffer)) {
1116                 dev_dbg_f(zd_usb_dev(usb),
1117                          "error: actual length %d exceeds buffer size %zu\n",
1118                          rr->length, sizeof(rr->buffer));
1119                 goto error_unlock;
1120         }
1121
1122         for (i = 0; i < count; i++) {
1123                 struct reg_data *rd = &regs->regs[i];
1124                 if (rd->addr != req->addr[i]) {
1125                         dev_dbg_f(zd_usb_dev(usb),
1126                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1127                                  le16_to_cpu(rd->addr),
1128                                  le16_to_cpu(req->addr[i]));
1129                         goto error_unlock;
1130                 }
1131                 values[i] = le16_to_cpu(rd->value);
1132         }
1133
1134         r = 0;
1135 error_unlock:
1136         spin_unlock(&intr->lock);
1137         return r;
1138 }
1139
1140 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1141                      const zd_addr_t *addresses, unsigned int count)
1142 {
1143         int r;
1144         int i, req_len, actual_req_len;
1145         struct usb_device *udev;
1146         struct usb_req_read_regs *req = NULL;
1147         unsigned long timeout;
1148
1149         if (count < 1) {
1150                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1151                 return -EINVAL;
1152         }
1153         if (count > USB_MAX_IOREAD16_COUNT) {
1154                 dev_dbg_f(zd_usb_dev(usb),
1155                          "error: count %u exceeds possible max %u\n",
1156                          count, USB_MAX_IOREAD16_COUNT);
1157                 return -EINVAL;
1158         }
1159         if (in_atomic()) {
1160                 dev_dbg_f(zd_usb_dev(usb),
1161                          "error: io in atomic context not supported\n");
1162                 return -EWOULDBLOCK;
1163         }
1164         if (!usb_int_enabled(usb)) {
1165                  dev_dbg_f(zd_usb_dev(usb),
1166                           "error: usb interrupt not enabled\n");
1167                 return -EWOULDBLOCK;
1168         }
1169
1170         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1171         req = kmalloc(req_len, GFP_NOFS);
1172         if (!req)
1173                 return -ENOMEM;
1174         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1175         for (i = 0; i < count; i++)
1176                 req->addr[i] = cpu_to_le16(usb_addr(usb, addresses[i]));
1177
1178         udev = zd_usb_to_usbdev(usb);
1179         prepare_read_regs_int(usb);
1180         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1181                          req, req_len, &actual_req_len, 1000 /* ms */);
1182         if (r) {
1183                 dev_dbg_f(zd_usb_dev(usb),
1184                         "error in usb_bulk_msg(). Error number %d\n", r);
1185                 goto error;
1186         }
1187         if (req_len != actual_req_len) {
1188                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1189                         " req_len %d != actual_req_len %d\n",
1190                         req_len, actual_req_len);
1191                 r = -EIO;
1192                 goto error;
1193         }
1194
1195         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1196                                               msecs_to_jiffies(1000));
1197         if (!timeout) {
1198                 disable_read_regs_int(usb);
1199                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1200                 r = -ETIMEDOUT;
1201                 goto error;
1202         }
1203
1204         r = get_results(usb, values, req, count);
1205 error:
1206         kfree(req);
1207         return r;
1208 }
1209
1210 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1211                       unsigned int count)
1212 {
1213         int r;
1214         struct usb_device *udev;
1215         struct usb_req_write_regs *req = NULL;
1216         int i, req_len, actual_req_len;
1217
1218         if (count == 0)
1219                 return 0;
1220         if (count > USB_MAX_IOWRITE16_COUNT) {
1221                 dev_dbg_f(zd_usb_dev(usb),
1222                         "error: count %u exceeds possible max %u\n",
1223                         count, USB_MAX_IOWRITE16_COUNT);
1224                 return -EINVAL;
1225         }
1226         if (in_atomic()) {
1227                 dev_dbg_f(zd_usb_dev(usb),
1228                         "error: io in atomic context not supported\n");
1229                 return -EWOULDBLOCK;
1230         }
1231
1232         req_len = sizeof(struct usb_req_write_regs) +
1233                   count * sizeof(struct reg_data);
1234         req = kmalloc(req_len, GFP_NOFS);
1235         if (!req)
1236                 return -ENOMEM;
1237
1238         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1239         for (i = 0; i < count; i++) {
1240                 struct reg_data *rw  = &req->reg_writes[i];
1241                 rw->addr = cpu_to_le16(usb_addr(usb, ioreqs[i].addr));
1242                 rw->value = cpu_to_le16(ioreqs[i].value);
1243         }
1244
1245         udev = zd_usb_to_usbdev(usb);
1246         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1247                          req, req_len, &actual_req_len, 1000 /* ms */);
1248         if (r) {
1249                 dev_dbg_f(zd_usb_dev(usb),
1250                         "error in usb_bulk_msg(). Error number %d\n", r);
1251                 goto error;
1252         }
1253         if (req_len != actual_req_len) {
1254                 dev_dbg_f(zd_usb_dev(usb),
1255                         "error in usb_bulk_msg()"
1256                         " req_len %d != actual_req_len %d\n",
1257                         req_len, actual_req_len);
1258                 r = -EIO;
1259                 goto error;
1260         }
1261
1262         /* FALL-THROUGH with r == 0 */
1263 error:
1264         kfree(req);
1265         return r;
1266 }
1267
1268 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1269 {
1270         int r;
1271         struct usb_device *udev;
1272         struct usb_req_rfwrite *req = NULL;
1273         int i, req_len, actual_req_len;
1274         u16 bit_value_template;
1275
1276         if (in_atomic()) {
1277                 dev_dbg_f(zd_usb_dev(usb),
1278                         "error: io in atomic context not supported\n");
1279                 return -EWOULDBLOCK;
1280         }
1281         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1282                 dev_dbg_f(zd_usb_dev(usb),
1283                         "error: bits %d are smaller than"
1284                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1285                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1286                 return -EINVAL;
1287         }
1288         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1289                 dev_dbg_f(zd_usb_dev(usb),
1290                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1291                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1292                 return -EINVAL;
1293         }
1294 #ifdef DEBUG
1295         if (value & (~0UL << bits)) {
1296                 dev_dbg_f(zd_usb_dev(usb),
1297                         "error: value %#09x has bits >= %d set\n",
1298                         value, bits);
1299                 return -EINVAL;
1300         }
1301 #endif /* DEBUG */
1302
1303         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1304
1305         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1306         if (r) {
1307                 dev_dbg_f(zd_usb_dev(usb),
1308                         "error %d: Couldn't read CR203\n", r);
1309                 goto out;
1310         }
1311         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1312
1313         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1314         req = kmalloc(req_len, GFP_NOFS);
1315         if (!req)
1316                 return -ENOMEM;
1317
1318         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1319         /* 1: 3683a, but not used in ZYDAS driver */
1320         req->value = cpu_to_le16(2);
1321         req->bits = cpu_to_le16(bits);
1322
1323         for (i = 0; i < bits; i++) {
1324                 u16 bv = bit_value_template;
1325                 if (value & (1 << (bits-1-i)))
1326                         bv |= RF_DATA;
1327                 req->bit_values[i] = cpu_to_le16(bv);
1328         }
1329
1330         udev = zd_usb_to_usbdev(usb);
1331         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1332                          req, req_len, &actual_req_len, 1000 /* ms */);
1333         if (r) {
1334                 dev_dbg_f(zd_usb_dev(usb),
1335                         "error in usb_bulk_msg(). Error number %d\n", r);
1336                 goto out;
1337         }
1338         if (req_len != actual_req_len) {
1339                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1340                         " req_len %d != actual_req_len %d\n",
1341                         req_len, actual_req_len);
1342                 r = -EIO;
1343                 goto out;
1344         }
1345
1346         /* FALL-THROUGH with r == 0 */
1347 out:
1348         kfree(req);
1349         return r;
1350 }