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 <linux/workqueue.h>
  28 #include <net/ieee80211.h>
  29
  30 #include "zd_def.h"
  31 #include "zd_netdev.h"
  32 #include "zd_mac.h"
  33 #include "zd_usb.h"
  34 #include "zd_util.h"
  35
  36 static struct usb_device_id usb_ids[] = {
  37         /* ZD1211 */
  38         { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
  39         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
  40         { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
  41         { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
  42         { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
  43         { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
  44         { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
  45         { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
  46         { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
  47         { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
  48         { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
  49         { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
  50         { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
  51         { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
  52         { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
  53         { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
  54         { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
  55         /* ZD1211B */
  56         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  57         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  58         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  59         { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
  60         { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
  61         { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
  62         { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
  63         { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
  64         { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
  65         /* "Driverless" devices that need ejecting */
  66         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
  67         {}
  68 };
  69
  70 MODULE_LICENSE("GPL");
  71 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
  72 MODULE_AUTHOR("Ulrich Kunitz");
  73 MODULE_AUTHOR("Daniel Drake");
  74 MODULE_VERSION("1.0");
  75 MODULE_DEVICE_TABLE(usb, usb_ids);
  76
  77 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
  78 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
  79
  80 /* USB device initialization */
  81
  82 static int request_fw_file(
  83         const struct firmware **fw, const char *name, struct device *device)
  84 {
  85         int r;
  86
  87         dev_dbg_f(device, "fw name %s\n", name);
  88
  89         r = request_firmware(fw, name, device);
  90         if (r)
  91                 dev_err(device,
  92                        "Could not load firmware file %s. Error number %d\n",
  93                        name, r);
  94         return r;
  95 }
  96
  97 static inline u16 get_bcdDevice(const struct usb_device *udev)
  98 {
  99         return le16_to_cpu(udev->descriptor.bcdDevice);
 100 }
 101
 102 enum upload_code_flags {
 103         REBOOT = 1,
 104 };
 105
 106 /* Ensures that MAX_TRANSFER_SIZE is even. */
 107 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 108
 109 static int upload_code(struct usb_device *udev,
 110         const u8 *data, size_t size, u16 code_offset, int flags)
 111 {
 112         u8 *p;
 113         int r;
 114
 115         /* USB request blocks need "kmalloced" buffers.
 116          */
 117         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 118         if (!p) {
 119                 dev_err(&udev->dev, "out of memory\n");
 120                 r = -ENOMEM;
 121                 goto error;
 122         }
 123
 124         size &= ~1;
 125         while (size > 0) {
 126                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 127                         size : MAX_TRANSFER_SIZE;
 128
 129                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 130
 131                 memcpy(p, data, transfer_size);
 132                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 133                         USB_REQ_FIRMWARE_DOWNLOAD,
 134                         USB_DIR_OUT | USB_TYPE_VENDOR,
 135                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 136                 if (r < 0) {
 137                         dev_err(&udev->dev,
 138                                "USB control request for firmware upload"
 139                                " failed. Error number %d\n", r);
 140                         goto error;
 141                 }
 142                 transfer_size = r & ~1;
 143
 144                 size -= transfer_size;
 145                 data += transfer_size;
 146                 code_offset += transfer_size/sizeof(u16);
 147         }
 148
 149         if (flags & REBOOT) {
 150                 u8 ret;
 151
 152                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 153                         USB_REQ_FIRMWARE_CONFIRM,
 154                         USB_DIR_IN | USB_TYPE_VENDOR,
 155                         0, 0, &ret, sizeof(ret), 5000 /* ms */);
 156                 if (r != sizeof(ret)) {
 157                         dev_err(&udev->dev,
 158                                 "control request firmeware confirmation failed."
 159                                 " Return value %d\n", r);
 160                         if (r >= 0)
 161                                 r = -ENODEV;
 162                         goto error;
 163                 }
 164                 if (ret & 0x80) {
 165                         dev_err(&udev->dev,
 166                                 "Internal error while downloading."
 167                                 " Firmware confirm return value %#04x\n",
 168                                 (unsigned int)ret);
 169                         r = -ENODEV;
 170                         goto error;
 171                 }
 172                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 173                         (unsigned int)ret);
 174         }
 175
 176         r = 0;
 177 error:
 178         kfree(p);
 179         return r;
 180 }
 181
 182 static u16 get_word(const void *data, u16 offset)
 183 {
 184         const __le16 *p = data;
 185         return le16_to_cpu(p[offset]);
 186 }
 187
 188 static char *get_fw_name(char *buffer, size_t size, u8 device_type,
 189                        const char* postfix)
 190 {
 191         scnprintf(buffer, size, "%s%s",
 192                 device_type == DEVICE_ZD1211B ?
 193                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 194                 postfix);
 195         return buffer;
 196 }
 197
 198 static int handle_version_mismatch(struct usb_device *udev, u8 device_type,
 199         const struct firmware *ub_fw)
 200 {
 201         const struct firmware *ur_fw = NULL;
 202         int offset;
 203         int r = 0;
 204         char fw_name[128];
 205
 206         r = request_fw_file(&ur_fw,
 207                 get_fw_name(fw_name, sizeof(fw_name), device_type, "ur"),
 208                 &udev->dev);
 209         if (r)
 210                 goto error;
 211
 212         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
 213         if (r)
 214                 goto error;
 215
 216         offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
 217         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
 218                 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
 219
 220         /* At this point, the vendor driver downloads the whole firmware
 221          * image, hacks around with version IDs, and uploads it again,
 222          * completely overwriting the boot code. We do not do this here as
 223          * it is not required on any tested devices, and it is suspected to
 224          * cause problems. */
 225 error:
 226         release_firmware(ur_fw);
 227         return r;
 228 }
 229
 230 static int upload_firmware(struct usb_device *udev, u8 device_type)
 231 {
 232         int r;
 233         u16 fw_bcdDevice;
 234         u16 bcdDevice;
 235         const struct firmware *ub_fw = NULL;
 236         const struct firmware *uph_fw = NULL;
 237         char fw_name[128];
 238
 239         bcdDevice = get_bcdDevice(udev);
 240
 241         r = request_fw_file(&ub_fw,
 242                 get_fw_name(fw_name, sizeof(fw_name), device_type,  "ub"),
 243                 &udev->dev);
 244         if (r)
 245                 goto error;
 246
 247         fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
 248
 249         if (fw_bcdDevice != bcdDevice) {
 250                 dev_info(&udev->dev,
 251                         "firmware version %#06x and device bootcode version "
 252                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
 253                 if (bcdDevice <= 0x4313)
 254                         dev_warn(&udev->dev, "device has old bootcode, please "
 255                                 "report success or failure\n");
 256
 257                 r = handle_version_mismatch(udev, device_type, ub_fw);
 258                 if (r)
 259                         goto error;
 260         } else {
 261                 dev_dbg_f(&udev->dev,
 262                         "firmware device id %#06x is equal to the "
 263                         "actual device id\n", fw_bcdDevice);
 264         }
 265
 266
 267         r = request_fw_file(&uph_fw,
 268                 get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"),
 269                 &udev->dev);
 270         if (r)
 271                 goto error;
 272
 273         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
 274         if (r) {
 275                 dev_err(&udev->dev,
 276                         "Could not upload firmware code uph. Error number %d\n",
 277                         r);
 278         }
 279
 280         /* FALL-THROUGH */
 281 error:
 282         release_firmware(ub_fw);
 283         release_firmware(uph_fw);
 284         return r;
 285 }
 286
 287 #define urb_dev(urb) (&(urb)->dev->dev)
 288
 289 static inline void handle_regs_int(struct urb *urb)
 290 {
 291         struct zd_usb *usb = urb->context;
 292         struct zd_usb_interrupt *intr = &usb->intr;
 293         int len;
 294
 295         ZD_ASSERT(in_interrupt());
 296         spin_lock(&intr->lock);
 297
 298         if (intr->read_regs_enabled) {
 299                 intr->read_regs.length = len = urb->actual_length;
 300
 301                 if (len > sizeof(intr->read_regs.buffer))
 302                         len = sizeof(intr->read_regs.buffer);
 303                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 304                 intr->read_regs_enabled = 0;
 305                 complete(&intr->read_regs.completion);
 306                 goto out;
 307         }
 308
 309         dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
 310 out:
 311         spin_unlock(&intr->lock);
 312 }
 313
 314 static inline void handle_retry_failed_int(struct urb *urb)
 315 {
 316         dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
 317 }
 318
 319
 320 static void int_urb_complete(struct urb *urb)
 321 {
 322         int r;
 323         struct usb_int_header *hdr;
 324
 325         switch (urb->status) {
 326         case 0:
 327                 break;
 328         case -ESHUTDOWN:
 329         case -EINVAL:
 330         case -ENODEV:
 331         case -ENOENT:
 332         case -ECONNRESET:
 333         case -EPIPE:
 334                 goto kfree;
 335         default:
 336                 goto resubmit;
 337         }
 338
 339         if (urb->actual_length < sizeof(hdr)) {
 340                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 341                 goto resubmit;
 342         }
 343
 344         hdr = urb->transfer_buffer;
 345         if (hdr->type != USB_INT_TYPE) {
 346                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 347                 goto resubmit;
 348         }
 349
 350         switch (hdr->id) {
 351         case USB_INT_ID_REGS:
 352                 handle_regs_int(urb);
 353                 break;
 354         case USB_INT_ID_RETRY_FAILED:
 355                 handle_retry_failed_int(urb);
 356                 break;
 357         default:
 358                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 359                         (unsigned int)hdr->id);
 360                 goto resubmit;
 361         }
 362
 363 resubmit:
 364         r = usb_submit_urb(urb, GFP_ATOMIC);
 365         if (r) {
 366                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
 367                 goto kfree;
 368         }
 369         return;
 370 kfree:
 371         kfree(urb->transfer_buffer);
 372 }
 373
 374 static inline int int_urb_interval(struct usb_device *udev)
 375 {
 376         switch (udev->speed) {
 377         case USB_SPEED_HIGH:
 378                 return 4;
 379         case USB_SPEED_LOW:
 380                 return 10;
 381         case USB_SPEED_FULL:
 382         default:
 383                 return 1;
 384         }
 385 }
 386
 387 static inline int usb_int_enabled(struct zd_usb *usb)
 388 {
 389         unsigned long flags;
 390         struct zd_usb_interrupt *intr = &usb->intr;
 391         struct urb *urb;
 392
 393         spin_lock_irqsave(&intr->lock, flags);
 394         urb = intr->urb;
 395         spin_unlock_irqrestore(&intr->lock, flags);
 396         return urb != NULL;
 397 }
 398
 399 int zd_usb_enable_int(struct zd_usb *usb)
 400 {
 401         int r;
 402         struct usb_device *udev;
 403         struct zd_usb_interrupt *intr = &usb->intr;
 404         void *transfer_buffer = NULL;
 405         struct urb *urb;
 406
 407         dev_dbg_f(zd_usb_dev(usb), "\n");
 408
 409         urb = usb_alloc_urb(0, GFP_NOFS);
 410         if (!urb) {
 411                 r = -ENOMEM;
 412                 goto out;
 413         }
 414
 415         ZD_ASSERT(!irqs_disabled());
 416         spin_lock_irq(&intr->lock);
 417         if (intr->urb) {
 418                 spin_unlock_irq(&intr->lock);
 419                 r = 0;
 420                 goto error_free_urb;
 421         }
 422         intr->urb = urb;
 423         spin_unlock_irq(&intr->lock);
 424
 425         /* TODO: make it a DMA buffer */
 426         r = -ENOMEM;
 427         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_NOFS);
 428         if (!transfer_buffer) {
 429                 dev_dbg_f(zd_usb_dev(usb),
 430                         "couldn't allocate transfer_buffer\n");
 431                 goto error_set_urb_null;
 432         }
 433
 434         udev = zd_usb_to_usbdev(usb);
 435         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 436                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
 437                          int_urb_complete, usb,
 438                          intr->interval);
 439
 440         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 441         r = usb_submit_urb(urb, GFP_NOFS);
 442         if (r) {
 443                 dev_dbg_f(zd_usb_dev(usb),
 444                          "Couldn't submit urb. Error number %d\n", r);
 445                 goto error;
 446         }
 447
 448         return 0;
 449 error:
 450         kfree(transfer_buffer);
 451 error_set_urb_null:
 452         spin_lock_irq(&intr->lock);
 453         intr->urb = NULL;
 454         spin_unlock_irq(&intr->lock);
 455 error_free_urb:
 456         usb_free_urb(urb);
 457 out:
 458         return r;
 459 }
 460
 461 void zd_usb_disable_int(struct zd_usb *usb)
 462 {
 463         unsigned long flags;
 464         struct zd_usb_interrupt *intr = &usb->intr;
 465         struct urb *urb;
 466
 467         spin_lock_irqsave(&intr->lock, flags);
 468         urb = intr->urb;
 469         if (!urb) {
 470                 spin_unlock_irqrestore(&intr->lock, flags);
 471                 return;
 472         }
 473         intr->urb = NULL;
 474         spin_unlock_irqrestore(&intr->lock, flags);
 475
 476         usb_kill_urb(urb);
 477         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 478         usb_free_urb(urb);
 479 }
 480
 481 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 482                              unsigned int length)
 483 {
 484         int i;
 485         struct zd_mac *mac = zd_usb_to_mac(usb);
 486         const struct rx_length_info *length_info;
 487
 488         if (length < sizeof(struct rx_length_info)) {
 489                 /* It's not a complete packet anyhow. */
 490                 return;
 491         }
 492         length_info = (struct rx_length_info *)
 493                 (buffer + length - sizeof(struct rx_length_info));
 494
 495         /* It might be that three frames are merged into a single URB
 496          * transaction. We have to check for the length info tag.
 497          *
 498          * While testing we discovered that length_info might be unaligned,
 499          * because if USB transactions are merged, the last packet will not
 500          * be padded. Unaligned access might also happen if the length_info
 501          * structure is not present.
 502          */
 503         if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
 504         {
 505                 unsigned int l, k, n;
 506                 for (i = 0, l = 0;; i++) {
 507                         k = le16_to_cpu(get_unaligned(&length_info->length[i]));
 508                         if (k == 0)
 509                                 return;
 510                         n = l+k;
 511                         if (n > length)
 512                                 return;
 513                         zd_mac_rx_irq(mac, buffer+l, k);
 514                         if (i >= 2)
 515                                 return;
 516                         l = (n+3) & ~3;
 517                 }
 518         } else {
 519                 zd_mac_rx_irq(mac, buffer, length);
 520         }
 521 }
 522
 523 static void rx_urb_complete(struct urb *urb)
 524 {
 525         struct zd_usb *usb;
 526         struct zd_usb_rx *rx;
 527         const u8 *buffer;
 528         unsigned int length;
 529
 530         switch (urb->status) {
 531         case 0:
 532                 break;
 533         case -ESHUTDOWN:
 534         case -EINVAL:
 535         case -ENODEV:
 536         case -ENOENT:
 537         case -ECONNRESET:
 538         case -EPIPE:
 539                 return;
 540         default:
 541                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 542                 goto resubmit;
 543         }
 544
 545         buffer = urb->transfer_buffer;
 546         length = urb->actual_length;
 547         usb = urb->context;
 548         rx = &usb->rx;
 549
 550         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 551                 /* If there is an old first fragment, we don't care. */
 552                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 553                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 554                 spin_lock(&rx->lock);
 555                 memcpy(rx->fragment, buffer, length);
 556                 rx->fragment_length = length;
 557                 spin_unlock(&rx->lock);
 558                 goto resubmit;
 559         }
 560
 561         spin_lock(&rx->lock);
 562         if (rx->fragment_length > 0) {
 563                 /* We are on a second fragment, we believe */
 564                 ZD_ASSERT(length + rx->fragment_length <=
 565                           ARRAY_SIZE(rx->fragment));
 566                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 567                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 568                 handle_rx_packet(usb, rx->fragment,
 569                                  rx->fragment_length + length);
 570                 rx->fragment_length = 0;
 571                 spin_unlock(&rx->lock);
 572         } else {
 573                 spin_unlock(&rx->lock);
 574                 handle_rx_packet(usb, buffer, length);
 575         }
 576
 577 resubmit:
 578         usb_submit_urb(urb, GFP_ATOMIC);
 579 }
 580
 581 static struct urb *alloc_urb(struct zd_usb *usb)
 582 {
 583         struct usb_device *udev = zd_usb_to_usbdev(usb);
 584         struct urb *urb;
 585         void *buffer;
 586
 587         urb = usb_alloc_urb(0, GFP_NOFS);
 588         if (!urb)
 589                 return NULL;
 590         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_NOFS,
 591                                   &urb->transfer_dma);
 592         if (!buffer) {
 593                 usb_free_urb(urb);
 594                 return NULL;
 595         }
 596
 597         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 598                           buffer, USB_MAX_RX_SIZE,
 599                           rx_urb_complete, usb);
 600         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 601
 602         return urb;
 603 }
 604
 605 static void free_urb(struct urb *urb)
 606 {
 607         if (!urb)
 608                 return;
 609         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 610                         urb->transfer_buffer, urb->transfer_dma);
 611         usb_free_urb(urb);
 612 }
 613
 614 int zd_usb_enable_rx(struct zd_usb *usb)
 615 {
 616         int i, r;
 617         struct zd_usb_rx *rx = &usb->rx;
 618         struct urb **urbs;
 619
 620         dev_dbg_f(zd_usb_dev(usb), "\n");
 621
 622         r = -ENOMEM;
 623         urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_NOFS);
 624         if (!urbs)
 625                 goto error;
 626         for (i = 0; i < URBS_COUNT; i++) {
 627                 urbs[i] = alloc_urb(usb);
 628                 if (!urbs[i])
 629                         goto error;
 630         }
 631
 632         ZD_ASSERT(!irqs_disabled());
 633         spin_lock_irq(&rx->lock);
 634         if (rx->urbs) {
 635                 spin_unlock_irq(&rx->lock);
 636                 r = 0;
 637                 goto error;
 638         }
 639         rx->urbs = urbs;
 640         rx->urbs_count = URBS_COUNT;
 641         spin_unlock_irq(&rx->lock);
 642
 643         for (i = 0; i < URBS_COUNT; i++) {
 644                 r = usb_submit_urb(urbs[i], GFP_NOFS);
 645                 if (r)
 646                         goto error_submit;
 647         }
 648
 649         return 0;
 650 error_submit:
 651         for (i = 0; i < URBS_COUNT; i++) {
 652                 usb_kill_urb(urbs[i]);
 653         }
 654         spin_lock_irq(&rx->lock);
 655         rx->urbs = NULL;
 656         rx->urbs_count = 0;
 657         spin_unlock_irq(&rx->lock);
 658 error:
 659         if (urbs) {
 660                 for (i = 0; i < URBS_COUNT; i++)
 661                         free_urb(urbs[i]);
 662         }
 663         return r;
 664 }
 665
 666 void zd_usb_disable_rx(struct zd_usb *usb)
 667 {
 668         int i;
 669         unsigned long flags;
 670         struct urb **urbs;
 671         unsigned int count;
 672         struct zd_usb_rx *rx = &usb->rx;
 673
 674         spin_lock_irqsave(&rx->lock, flags);
 675         urbs = rx->urbs;
 676         count = rx->urbs_count;
 677         spin_unlock_irqrestore(&rx->lock, flags);
 678         if (!urbs)
 679                 return;
 680
 681         for (i = 0; i < count; i++) {
 682                 usb_kill_urb(urbs[i]);
 683                 free_urb(urbs[i]);
 684         }
 685         kfree(urbs);
 686
 687         spin_lock_irqsave(&rx->lock, flags);
 688         rx->urbs = NULL;
 689         rx->urbs_count = 0;
 690         spin_unlock_irqrestore(&rx->lock, flags);
 691 }
 692
 693 static void tx_urb_complete(struct urb *urb)
 694 {
 695         int r;
 696
 697         switch (urb->status) {
 698         case 0:
 699                 break;
 700         case -ESHUTDOWN:
 701         case -EINVAL:
 702         case -ENODEV:
 703         case -ENOENT:
 704         case -ECONNRESET:
 705         case -EPIPE:
 706                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 707                 break;
 708         default:
 709                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 710                 goto resubmit;
 711         }
 712 free_urb:
 713         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 714                         urb->transfer_buffer, urb->transfer_dma);
 715         usb_free_urb(urb);
 716         return;
 717 resubmit:
 718         r = usb_submit_urb(urb, GFP_ATOMIC);
 719         if (r) {
 720                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 721                 goto free_urb;
 722         }
 723 }
 724
 725 /* Puts the frame on the USB endpoint. It doesn't wait for
 726  * completion. The frame must contain the control set.
 727  */
 728 int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
 729 {
 730         int r;
 731         struct usb_device *udev = zd_usb_to_usbdev(usb);
 732         struct urb *urb;
 733         void *buffer;
 734
 735         urb = usb_alloc_urb(0, GFP_ATOMIC);
 736         if (!urb) {
 737                 r = -ENOMEM;
 738                 goto out;
 739         }
 740
 741         buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
 742                                   &urb->transfer_dma);
 743         if (!buffer) {
 744                 r = -ENOMEM;
 745                 goto error_free_urb;
 746         }
 747         memcpy(buffer, frame, length);
 748
 749         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 750                           buffer, length, tx_urb_complete, NULL);
 751         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 752
 753         r = usb_submit_urb(urb, GFP_ATOMIC);
 754         if (r)
 755                 goto error;
 756         return 0;
 757 error:
 758         usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
 759                         urb->transfer_dma);
 760 error_free_urb:
 761         usb_free_urb(urb);
 762 out:
 763         return r;
 764 }
 765
 766 static inline void init_usb_interrupt(struct zd_usb *usb)
 767 {
 768         struct zd_usb_interrupt *intr = &usb->intr;
 769
 770         spin_lock_init(&intr->lock);
 771         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 772         init_completion(&intr->read_regs.completion);
 773         intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
 774 }
 775
 776 static inline void init_usb_rx(struct zd_usb *usb)
 777 {
 778         struct zd_usb_rx *rx = &usb->rx;
 779         spin_lock_init(&rx->lock);
 780         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 781                 rx->usb_packet_size = 512;
 782         } else {
 783                 rx->usb_packet_size = 64;
 784         }
 785         ZD_ASSERT(rx->fragment_length == 0);
 786 }
 787
 788 static inline void init_usb_tx(struct zd_usb *usb)
 789 {
 790         /* FIXME: at this point we will allocate a fixed number of urb's for
 791          * use in a cyclic scheme */
 792 }
 793
 794 void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
 795                  struct usb_interface *intf)
 796 {
 797         memset(usb, 0, sizeof(*usb));
 798         usb->intf = usb_get_intf(intf);
 799         usb_set_intfdata(usb->intf, netdev);
 800         init_usb_interrupt(usb);
 801         init_usb_tx(usb);
 802         init_usb_rx(usb);
 803 }
 804
 805 void zd_usb_clear(struct zd_usb *usb)
 806 {
 807         usb_set_intfdata(usb->intf, NULL);
 808         usb_put_intf(usb->intf);
 809         ZD_MEMCLEAR(usb, sizeof(*usb));
 810         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
 811 }
 812
 813 static const char *speed(enum usb_device_speed speed)
 814 {
 815         switch (speed) {
 816         case USB_SPEED_LOW:
 817                 return "low";
 818         case USB_SPEED_FULL:
 819                 return "full";
 820         case USB_SPEED_HIGH:
 821                 return "high";
 822         default:
 823                 return "unknown speed";
 824         }
 825 }
 826
 827 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
 828 {
 829         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
 830                 le16_to_cpu(udev->descriptor.idVendor),
 831                 le16_to_cpu(udev->descriptor.idProduct),
 832                 get_bcdDevice(udev),
 833                 speed(udev->speed));
 834 }
 835
 836 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
 837 {
 838         struct usb_device *udev = interface_to_usbdev(usb->intf);
 839         return scnprint_id(udev, buffer, size);
 840 }
 841
 842 #ifdef DEBUG
 843 static void print_id(struct usb_device *udev)
 844 {
 845         char buffer[40];
 846
 847         scnprint_id(udev, buffer, sizeof(buffer));
 848         buffer[sizeof(buffer)-1] = 0;
 849         dev_dbg_f(&udev->dev, "%s\n", buffer);
 850 }
 851 #else
 852 #define print_id(udev) do { } while (0)
 853 #endif
 854
 855 static int eject_installer(struct usb_interface *intf)
 856 {
 857         struct usb_device *udev = interface_to_usbdev(intf);
 858         struct usb_host_interface *iface_desc = &intf->altsetting[0];
 859         struct usb_endpoint_descriptor *endpoint;
 860         unsigned char *cmd;
 861         u8 bulk_out_ep;
 862         int r;
 863
 864         /* Find bulk out endpoint */
 865         endpoint = &iface_desc->endpoint[1].desc;
 866         if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
 867             (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
 868             USB_ENDPOINT_XFER_BULK) {
 869                 bulk_out_ep = endpoint->bEndpointAddress;
 870         } else {
 871                 dev_err(&udev->dev,
 872                         "zd1211rw: Could not find bulk out endpoint\n");
 873                 return -ENODEV;
 874         }
 875
 876         cmd = kzalloc(31, GFP_KERNEL);
 877         if (cmd == NULL)
 878                 return -ENODEV;
 879
 880         /* USB bulk command block */
 881         cmd[0] = 0x55;  /* bulk command signature */
 882         cmd[1] = 0x53;  /* bulk command signature */
 883         cmd[2] = 0x42;  /* bulk command signature */
 884         cmd[3] = 0x43;  /* bulk command signature */
 885         cmd[14] = 6;    /* command length */
 886
 887         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
 888         cmd[19] = 0x2;  /* eject disc */
 889
 890         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
 891         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
 892                 cmd, 31, NULL, 2000);
 893         kfree(cmd);
 894         if (r)
 895                 return r;
 896
 897         /* At this point, the device disconnects and reconnects with the real
 898          * ID numbers. */
 899
 900         usb_set_intfdata(intf, NULL);
 901         return 0;
 902 }
 903
 904 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
 905 {
 906         int r;
 907         struct usb_device *udev = interface_to_usbdev(intf);
 908         struct net_device *netdev = NULL;
 909
 910         print_id(udev);
 911
 912         if (id->driver_info & DEVICE_INSTALLER)
 913                 return eject_installer(intf);
 914
 915         switch (udev->speed) {
 916         case USB_SPEED_LOW:
 917         case USB_SPEED_FULL:
 918         case USB_SPEED_HIGH:
 919                 break;
 920         default:
 921                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
 922                 r = -ENODEV;
 923                 goto error;
 924         }
 925
 926         netdev = zd_netdev_alloc(intf);
 927         if (netdev == NULL) {
 928                 r = -ENOMEM;
 929                 goto error;
 930         }
 931
 932         r = upload_firmware(udev, id->driver_info);
 933         if (r) {
 934                 dev_err(&intf->dev,
 935                        "couldn't load firmware. Error number %d\n", r);
 936                 goto error;
 937         }
 938
 939         r = usb_reset_configuration(udev);
 940         if (r) {
 941                 dev_dbg_f(&intf->dev,
 942                         "couldn't reset configuration. Error number %d\n", r);
 943                 goto error;
 944         }
 945
 946         /* At this point the interrupt endpoint is not generally enabled. We
 947          * save the USB bandwidth until the network device is opened. But
 948          * notify that the initialization of the MAC will require the
 949          * interrupts to be temporary enabled.
 950          */
 951         r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
 952         if (r) {
 953                 dev_dbg_f(&intf->dev,
 954                          "couldn't initialize mac. Error number %d\n", r);
 955                 goto error;
 956         }
 957
 958         r = register_netdev(netdev);
 959         if (r) {
 960                 dev_dbg_f(&intf->dev,
 961                          "couldn't register netdev. Error number %d\n", r);
 962                 goto error;
 963         }
 964
 965         dev_dbg_f(&intf->dev, "successful\n");
 966         dev_info(&intf->dev,"%s\n", netdev->name);
 967         return 0;
 968 error:
 969         usb_reset_device(interface_to_usbdev(intf));
 970         zd_netdev_free(netdev);
 971         return r;
 972 }
 973
 974 static void disconnect(struct usb_interface *intf)
 975 {
 976         struct net_device *netdev = zd_intf_to_netdev(intf);
 977         struct zd_mac *mac = zd_netdev_mac(netdev);
 978         struct zd_usb *usb = &mac->chip.usb;
 979
 980         /* Either something really bad happened, or we're just dealing with
 981          * a DEVICE_INSTALLER. */
 982         if (netdev == NULL)
 983                 return;
 984
 985         dev_dbg_f(zd_usb_dev(usb), "\n");
 986
 987         zd_netdev_disconnect(netdev);
 988
 989         /* Just in case something has gone wrong! */
 990         zd_usb_disable_rx(usb);
 991         zd_usb_disable_int(usb);
 992
 993         /* If the disconnect has been caused by a removal of the
 994          * driver module, the reset allows reloading of the driver. If the
 995          * reset will not be executed here, the upload of the firmware in the
 996          * probe function caused by the reloading of the driver will fail.
 997          */
 998         usb_reset_device(interface_to_usbdev(intf));
 999
1000         zd_netdev_free(netdev);
1001         dev_dbg(&intf->dev, "disconnected\n");
1002 }
1003
1004 static struct usb_driver driver = {
1005         .name           = "zd1211rw",
1006         .id_table       = usb_ids,
1007         .probe          = probe,
1008         .disconnect     = disconnect,
1009 };
1010
1011 struct workqueue_struct *zd_workqueue;
1012
1013 static int __init usb_init(void)
1014 {
1015         int r;
1016
1017         pr_debug("%s usb_init()\n", driver.name);
1018
1019         zd_workqueue = create_singlethread_workqueue(driver.name);
1020         if (zd_workqueue == NULL) {
1021                 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1022                 return -ENOMEM;
1023         }
1024
1025         r = usb_register(&driver);
1026         if (r) {
1027                 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1028                        driver.name, r);
1029                 return r;
1030         }
1031
1032         pr_debug("%s initialized\n", driver.name);
1033         return 0;
1034 }
1035
1036 static void __exit usb_exit(void)
1037 {
1038         pr_debug("%s usb_exit()\n", driver.name);
1039         usb_deregister(&driver);
1040         destroy_workqueue(zd_workqueue);
1041 }
1042
1043 module_init(usb_init);
1044 module_exit(usb_exit);
1045
1046 static int usb_int_regs_length(unsigned int count)
1047 {
1048         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1049 }
1050
1051 static void prepare_read_regs_int(struct zd_usb *usb)
1052 {
1053         struct zd_usb_interrupt *intr = &usb->intr;
1054
1055         spin_lock_irq(&intr->lock);
1056         intr->read_regs_enabled = 1;
1057         INIT_COMPLETION(intr->read_regs.completion);
1058         spin_unlock_irq(&intr->lock);
1059 }
1060
1061 static void disable_read_regs_int(struct zd_usb *usb)
1062 {
1063         struct zd_usb_interrupt *intr = &usb->intr;
1064
1065         spin_lock_irq(&intr->lock);
1066         intr->read_regs_enabled = 0;
1067         spin_unlock_irq(&intr->lock);
1068 }
1069
1070 static int get_results(struct zd_usb *usb, u16 *values,
1071                        struct usb_req_read_regs *req, unsigned int count)
1072 {
1073         int r;
1074         int i;
1075         struct zd_usb_interrupt *intr = &usb->intr;
1076         struct read_regs_int *rr = &intr->read_regs;
1077         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1078
1079         spin_lock_irq(&intr->lock);
1080
1081         r = -EIO;
1082         /* The created block size seems to be larger than expected.
1083          * However results appear to be correct.
1084          */
1085         if (rr->length < usb_int_regs_length(count)) {
1086                 dev_dbg_f(zd_usb_dev(usb),
1087                          "error: actual length %d less than expected %d\n",
1088                          rr->length, usb_int_regs_length(count));
1089                 goto error_unlock;
1090         }
1091         if (rr->length > sizeof(rr->buffer)) {
1092                 dev_dbg_f(zd_usb_dev(usb),
1093                          "error: actual length %d exceeds buffer size %zu\n",
1094                          rr->length, sizeof(rr->buffer));
1095                 goto error_unlock;
1096         }
1097
1098         for (i = 0; i < count; i++) {
1099                 struct reg_data *rd = &regs->regs[i];
1100                 if (rd->addr != req->addr[i]) {
1101                         dev_dbg_f(zd_usb_dev(usb),
1102                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1103                                  le16_to_cpu(rd->addr),
1104                                  le16_to_cpu(req->addr[i]));
1105                         goto error_unlock;
1106                 }
1107                 values[i] = le16_to_cpu(rd->value);
1108         }
1109
1110         r = 0;
1111 error_unlock:
1112         spin_unlock_irq(&intr->lock);
1113         return r;
1114 }
1115
1116 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1117                      const zd_addr_t *addresses, unsigned int count)
1118 {
1119         int r;
1120         int i, req_len, actual_req_len;
1121         struct usb_device *udev;
1122         struct usb_req_read_regs *req = NULL;
1123         unsigned long timeout;
1124
1125         if (count < 1) {
1126                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1127                 return -EINVAL;
1128         }
1129         if (count > USB_MAX_IOREAD16_COUNT) {
1130                 dev_dbg_f(zd_usb_dev(usb),
1131                          "error: count %u exceeds possible max %u\n",
1132                          count, USB_MAX_IOREAD16_COUNT);
1133                 return -EINVAL;
1134         }
1135         if (in_atomic()) {
1136                 dev_dbg_f(zd_usb_dev(usb),
1137                          "error: io in atomic context not supported\n");
1138                 return -EWOULDBLOCK;
1139         }
1140         if (!usb_int_enabled(usb)) {
1141                  dev_dbg_f(zd_usb_dev(usb),
1142                           "error: usb interrupt not enabled\n");
1143                 return -EWOULDBLOCK;
1144         }
1145
1146         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1147         req = kmalloc(req_len, GFP_NOFS);
1148         if (!req)
1149                 return -ENOMEM;
1150         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1151         for (i = 0; i < count; i++)
1152                 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1153
1154         udev = zd_usb_to_usbdev(usb);
1155         prepare_read_regs_int(usb);
1156         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1157                          req, req_len, &actual_req_len, 1000 /* ms */);
1158         if (r) {
1159                 dev_dbg_f(zd_usb_dev(usb),
1160                         "error in usb_bulk_msg(). Error number %d\n", r);
1161                 goto error;
1162         }
1163         if (req_len != actual_req_len) {
1164                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1165                         " req_len %d != actual_req_len %d\n",
1166                         req_len, actual_req_len);
1167                 r = -EIO;
1168                 goto error;
1169         }
1170
1171         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1172                                               msecs_to_jiffies(1000));
1173         if (!timeout) {
1174                 disable_read_regs_int(usb);
1175                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1176                 r = -ETIMEDOUT;
1177                 goto error;
1178         }
1179
1180         r = get_results(usb, values, req, count);
1181 error:
1182         kfree(req);
1183         return r;
1184 }
1185
1186 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1187                       unsigned int count)
1188 {
1189         int r;
1190         struct usb_device *udev;
1191         struct usb_req_write_regs *req = NULL;
1192         int i, req_len, actual_req_len;
1193
1194         if (count == 0)
1195                 return 0;
1196         if (count > USB_MAX_IOWRITE16_COUNT) {
1197                 dev_dbg_f(zd_usb_dev(usb),
1198                         "error: count %u exceeds possible max %u\n",
1199                         count, USB_MAX_IOWRITE16_COUNT);
1200                 return -EINVAL;
1201         }
1202         if (in_atomic()) {
1203                 dev_dbg_f(zd_usb_dev(usb),
1204                         "error: io in atomic context not supported\n");
1205                 return -EWOULDBLOCK;
1206         }
1207
1208         req_len = sizeof(struct usb_req_write_regs) +
1209                   count * sizeof(struct reg_data);
1210         req = kmalloc(req_len, GFP_NOFS);
1211         if (!req)
1212                 return -ENOMEM;
1213
1214         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1215         for (i = 0; i < count; i++) {
1216                 struct reg_data *rw  = &req->reg_writes[i];
1217                 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1218                 rw->value = cpu_to_le16(ioreqs[i].value);
1219         }
1220
1221         udev = zd_usb_to_usbdev(usb);
1222         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1223                          req, req_len, &actual_req_len, 1000 /* ms */);
1224         if (r) {
1225                 dev_dbg_f(zd_usb_dev(usb),
1226                         "error in usb_bulk_msg(). Error number %d\n", r);
1227                 goto error;
1228         }
1229         if (req_len != actual_req_len) {
1230                 dev_dbg_f(zd_usb_dev(usb),
1231                         "error in usb_bulk_msg()"
1232                         " req_len %d != actual_req_len %d\n",
1233                         req_len, actual_req_len);
1234                 r = -EIO;
1235                 goto error;
1236         }
1237
1238         /* FALL-THROUGH with r == 0 */
1239 error:
1240         kfree(req);
1241         return r;
1242 }
1243
1244 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1245 {
1246         int r;
1247         struct usb_device *udev;
1248         struct usb_req_rfwrite *req = NULL;
1249         int i, req_len, actual_req_len;
1250         u16 bit_value_template;
1251
1252         if (in_atomic()) {
1253                 dev_dbg_f(zd_usb_dev(usb),
1254                         "error: io in atomic context not supported\n");
1255                 return -EWOULDBLOCK;
1256         }
1257         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1258                 dev_dbg_f(zd_usb_dev(usb),
1259                         "error: bits %d are smaller than"
1260                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1261                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1262                 return -EINVAL;
1263         }
1264         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1265                 dev_dbg_f(zd_usb_dev(usb),
1266                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1267                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1268                 return -EINVAL;
1269         }
1270 #ifdef DEBUG
1271         if (value & (~0UL << bits)) {
1272                 dev_dbg_f(zd_usb_dev(usb),
1273                         "error: value %#09x has bits >= %d set\n",
1274                         value, bits);
1275                 return -EINVAL;
1276         }
1277 #endif /* DEBUG */
1278
1279         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1280
1281         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1282         if (r) {
1283                 dev_dbg_f(zd_usb_dev(usb),
1284                         "error %d: Couldn't read CR203\n", r);
1285                 goto out;
1286         }
1287         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1288
1289         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1290         req = kmalloc(req_len, GFP_NOFS);
1291         if (!req)
1292                 return -ENOMEM;
1293
1294         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1295         /* 1: 3683a, but not used in ZYDAS driver */
1296         req->value = cpu_to_le16(2);
1297         req->bits = cpu_to_le16(bits);
1298
1299         for (i = 0; i < bits; i++) {
1300                 u16 bv = bit_value_template;
1301                 if (value & (1 << (bits-1-i)))
1302                         bv |= RF_DATA;
1303                 req->bit_values[i] = cpu_to_le16(bv);
1304         }
1305
1306         udev = zd_usb_to_usbdev(usb);
1307         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1308                          req, req_len, &actual_req_len, 1000 /* ms */);
1309         if (r) {
1310                 dev_dbg_f(zd_usb_dev(usb),
1311                         "error in usb_bulk_msg(). Error number %d\n", r);
1312                 goto out;
1313         }
1314         if (req_len != actual_req_len) {
1315                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1316                         " req_len %d != actual_req_len %d\n",
1317                         req_len, actual_req_len);
1318                 r = -EIO;
1319                 goto out;
1320         }
1321
1322         /* FALL-THROUGH with r == 0 */
1323 out:
1324         kfree(req);
1325         return r;
1326 }