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