Pileus Git - ~andy/linux/blob - 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         /* ZD1211B */
  55         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  56         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  57         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  58         { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
  59         /* "Driverless" devices that need ejecting */
  60         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
  61         {}
  62 };
  63
  64 MODULE_LICENSE("GPL");
  65 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
  66 MODULE_AUTHOR("Ulrich Kunitz");
  67 MODULE_AUTHOR("Daniel Drake");
  68 MODULE_VERSION("1.0");
  69 MODULE_DEVICE_TABLE(usb, usb_ids);
  70
  71 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
  72 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
  73
  74 /* register address handling */
  75
  76 #ifdef DEBUG
  77 static int check_addr(struct zd_usb *usb, zd_addr_t addr)
  78 {
  79         u32 base = ZD_ADDR_BASE(addr);
  80         u32 offset = ZD_OFFSET(addr);
  81
  82         if ((u32)addr & ADDR_ZERO_MASK)
  83                 goto invalid_address;
  84         switch (base) {
  85         case USB_BASE:
  86                 break;
  87         case CR_BASE:
  88                 if (offset > CR_MAX_OFFSET) {
  89                         dev_dbg(zd_usb_dev(usb),
  90                                 "CR offset %#010x larger than"
  91                                 " CR_MAX_OFFSET %#10x\n",
  92                                 offset, CR_MAX_OFFSET);
  93                         goto invalid_address;
  94                 }
  95                 if (offset & 1) {
  96                         dev_dbg(zd_usb_dev(usb),
  97                                 "CR offset %#010x is not a multiple of 2\n",
  98                                 offset);
  99                         goto invalid_address;
 100                 }
 101                 break;
 102         case E2P_BASE:
 103                 if (offset > E2P_MAX_OFFSET) {
 104                         dev_dbg(zd_usb_dev(usb),
 105                                 "E2P offset %#010x larger than"
 106                                 " E2P_MAX_OFFSET %#010x\n",
 107                                 offset, E2P_MAX_OFFSET);
 108                         goto invalid_address;
 109                 }
 110                 break;
 111         case FW_BASE:
 112                 if (!usb->fw_base_offset) {
 113                         dev_dbg(zd_usb_dev(usb),
 114                                "ERROR: fw base offset has not been set\n");
 115                         return -EAGAIN;
 116                 }
 117                 if (offset > FW_MAX_OFFSET) {
 118                         dev_dbg(zd_usb_dev(usb),
 119                                 "FW offset %#10x is larger than"
 120                                 " FW_MAX_OFFSET %#010x\n",
 121                                 offset, FW_MAX_OFFSET);
 122                         goto invalid_address;
 123                 }
 124                 break;
 125         default:
 126                 dev_dbg(zd_usb_dev(usb),
 127                         "address has unsupported base %#010x\n", addr);
 128                 goto invalid_address;
 129         }
 130
 131         return 0;
 132 invalid_address:
 133         dev_dbg(zd_usb_dev(usb),
 134                 "ERROR: invalid address: %#010x\n", addr);
 135         return -EINVAL;
 136 }
 137 #endif /* DEBUG */
 138
 139 static u16 usb_addr(struct zd_usb *usb, zd_addr_t addr)
 140 {
 141         u32 base;
 142         u16 offset;
 143
 144         base = ZD_ADDR_BASE(addr);
 145         offset = ZD_OFFSET(addr);
 146
 147         ZD_ASSERT(check_addr(usb, addr) == 0);
 148
 149         switch (base) {
 150         case CR_BASE:
 151                 offset += CR_BASE_OFFSET;
 152                 break;
 153         case E2P_BASE:
 154                 offset += E2P_BASE_OFFSET;
 155                 break;
 156         case FW_BASE:
 157                 offset += usb->fw_base_offset;
 158                 break;
 159         }
 160
 161         return offset;
 162 }
 163
 164 /* USB device initialization */
 165
 166 static int request_fw_file(
 167         const struct firmware **fw, const char *name, struct device *device)
 168 {
 169         int r;
 170
 171         dev_dbg_f(device, "fw name %s\n", name);
 172
 173         r = request_firmware(fw, name, device);
 174         if (r)
 175                 dev_err(device,
 176                        "Could not load firmware file %s. Error number %d\n",
 177                        name, r);
 178         return r;
 179 }
 180
 181 static inline u16 get_bcdDevice(const struct usb_device *udev)
 182 {
 183         return le16_to_cpu(udev->descriptor.bcdDevice);
 184 }
 185
 186 enum upload_code_flags {
 187         REBOOT = 1,
 188 };
 189
 190 /* Ensures that MAX_TRANSFER_SIZE is even. */
 191 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 192
 193 static int upload_code(struct usb_device *udev,
 194         const u8 *data, size_t size, u16 code_offset, int flags)
 195 {
 196         u8 *p;
 197         int r;
 198
 199         /* USB request blocks need "kmalloced" buffers.
 200          */
 201         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 202         if (!p) {
 203                 dev_err(&udev->dev, "out of memory\n");
 204                 r = -ENOMEM;
 205                 goto error;
 206         }
 207
 208         size &= ~1;
 209         while (size > 0) {
 210                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 211                         size : MAX_TRANSFER_SIZE;
 212
 213                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 214
 215                 memcpy(p, data, transfer_size);
 216                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 217                         USB_REQ_FIRMWARE_DOWNLOAD,
 218                         USB_DIR_OUT | USB_TYPE_VENDOR,
 219                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 220                 if (r < 0) {
 221                         dev_err(&udev->dev,
 222                                "USB control request for firmware upload"
 223                                " failed. Error number %d\n", r);
 224                         goto error;
 225                 }
 226                 transfer_size = r & ~1;
 227
 228                 size -= transfer_size;
 229                 data += transfer_size;
 230                 code_offset += transfer_size/sizeof(u16);
 231         }
 232
 233         if (flags & REBOOT) {
 234                 u8 ret;
 235
 236                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 237                         USB_REQ_FIRMWARE_CONFIRM,
 238                         USB_DIR_IN | USB_TYPE_VENDOR,
 239                         0, 0, &ret, sizeof(ret), 5000 /* ms */);
 240                 if (r != sizeof(ret)) {
 241                         dev_err(&udev->dev,
 242                                 "control request firmeware confirmation failed."
 243                                 " Return value %d\n", r);
 244                         if (r >= 0)
 245                                 r = -ENODEV;
 246                         goto error;
 247                 }
 248                 if (ret & 0x80) {
 249                         dev_err(&udev->dev,
 250                                 "Internal error while downloading."
 251                                 " Firmware confirm return value %#04x\n",
 252                                 (unsigned int)ret);
 253                         r = -ENODEV;
 254                         goto error;
 255                 }
 256                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 257                         (unsigned int)ret);
 258         }
 259
 260         r = 0;
 261 error:
 262         kfree(p);
 263         return r;
 264 }
 265
 266 static u16 get_word(const void *data, u16 offset)
 267 {
 268         const __le16 *p = data;
 269         return le16_to_cpu(p[offset]);
 270 }
 271
 272 static char *get_fw_name(char *buffer, size_t size, u8 device_type,
 273                        const char* postfix)
 274 {
 275         scnprintf(buffer, size, "%s%s",
 276                 device_type == DEVICE_ZD1211B ?
 277                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 278                 postfix);
 279         return buffer;
 280 }
 281
 282 static int handle_version_mismatch(struct usb_device *udev, u8 device_type,
 283         const struct firmware *ub_fw)
 284 {
 285         const struct firmware *ur_fw = NULL;
 286         int offset;
 287         int r = 0;
 288         char fw_name[128];
 289
 290         r = request_fw_file(&ur_fw,
 291                 get_fw_name(fw_name, sizeof(fw_name), device_type, "ur"),
 292                 &udev->dev);
 293         if (r)
 294                 goto error;
 295
 296         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START_OFFSET,
 297                 REBOOT);
 298         if (r)
 299                 goto error;
 300
 301         offset = ((EEPROM_REGS_OFFSET + EEPROM_REGS_SIZE) * sizeof(u16));
 302         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
 303                 E2P_BASE_OFFSET + EEPROM_REGS_SIZE, REBOOT);
 304
 305         /* At this point, the vendor driver downloads the whole firmware
 306          * image, hacks around with version IDs, and uploads it again,
 307          * completely overwriting the boot code. We do not do this here as
 308          * it is not required on any tested devices, and it is suspected to
 309          * cause problems. */
 310 error:
 311         release_firmware(ur_fw);
 312         return r;
 313 }
 314
 315 static int upload_firmware(struct usb_device *udev, u8 device_type)
 316 {
 317         int r;
 318         u16 fw_bcdDevice;
 319         u16 bcdDevice;
 320         const struct firmware *ub_fw = NULL;
 321         const struct firmware *uph_fw = NULL;
 322         char fw_name[128];
 323
 324         bcdDevice = get_bcdDevice(udev);
 325
 326         r = request_fw_file(&ub_fw,
 327                 get_fw_name(fw_name, sizeof(fw_name), device_type,  "ub"),
 328                 &udev->dev);
 329         if (r)
 330                 goto error;
 331
 332         fw_bcdDevice = get_word(ub_fw->data, EEPROM_REGS_OFFSET);
 333
 334         if (fw_bcdDevice != bcdDevice) {
 335                 dev_info(&udev->dev,
 336                         "firmware version %#06x and device bootcode version "
 337                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
 338                 if (bcdDevice <= 0x4313)
 339                         dev_warn(&udev->dev, "device has old bootcode, please "
 340                                 "report success or failure\n");
 341
 342                 r = handle_version_mismatch(udev, device_type, ub_fw);
 343                 if (r)
 344                         goto error;
 345         } else {
 346                 dev_dbg_f(&udev->dev,
 347                         "firmware device id %#06x is equal to the "
 348                         "actual device id\n", fw_bcdDevice);
 349         }
 350
 351
 352         r = request_fw_file(&uph_fw,
 353                 get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"),
 354                 &udev->dev);
 355         if (r)
 356                 goto error;
 357
 358         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START_OFFSET,
 359                         REBOOT);
 360         if (r) {
 361                 dev_err(&udev->dev,
 362                         "Could not upload firmware code uph. Error number %d\n",
 363                         r);
 364         }
 365
 366         /* FALL-THROUGH */
 367 error:
 368         release_firmware(ub_fw);
 369         release_firmware(uph_fw);
 370         return r;
 371 }
 372
 373 #define urb_dev(urb) (&(urb)->dev->dev)
 374
 375 static inline void handle_regs_int(struct urb *urb)
 376 {
 377         struct zd_usb *usb = urb->context;
 378         struct zd_usb_interrupt *intr = &usb->intr;
 379         int len;
 380
 381         ZD_ASSERT(in_interrupt());
 382         spin_lock(&intr->lock);
 383
 384         if (intr->read_regs_enabled) {
 385                 intr->read_regs.length = len = urb->actual_length;
 386
 387                 if (len > sizeof(intr->read_regs.buffer))
 388                         len = sizeof(intr->read_regs.buffer);
 389                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 390                 intr->read_regs_enabled = 0;
 391                 complete(&intr->read_regs.completion);
 392                 goto out;
 393         }
 394
 395         dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
 396 out:
 397         spin_unlock(&intr->lock);
 398 }
 399
 400 static inline void handle_retry_failed_int(struct urb *urb)
 401 {
 402         dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
 403 }
 404
 405
 406 static void int_urb_complete(struct urb *urb)
 407 {
 408         int r;
 409         struct usb_int_header *hdr;
 410
 411         switch (urb->status) {
 412         case 0:
 413                 break;
 414         case -ESHUTDOWN:
 415         case -EINVAL:
 416         case -ENODEV:
 417         case -ENOENT:
 418         case -ECONNRESET:
 419         case -EPIPE:
 420                 goto kfree;
 421         default:
 422                 goto resubmit;
 423         }
 424
 425         if (urb->actual_length < sizeof(hdr)) {
 426                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 427                 goto resubmit;
 428         }
 429
 430         hdr = urb->transfer_buffer;
 431         if (hdr->type != USB_INT_TYPE) {
 432                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 433                 goto resubmit;
 434         }
 435
 436         switch (hdr->id) {
 437         case USB_INT_ID_REGS:
 438                 handle_regs_int(urb);
 439                 break;
 440         case USB_INT_ID_RETRY_FAILED:
 441                 handle_retry_failed_int(urb);
 442                 break;
 443         default:
 444                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 445                         (unsigned int)hdr->id);
 446                 goto resubmit;
 447         }
 448
 449 resubmit:
 450         r = usb_submit_urb(urb, GFP_ATOMIC);
 451         if (r) {
 452                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
 453                 goto kfree;
 454         }
 455         return;
 456 kfree:
 457         kfree(urb->transfer_buffer);
 458 }
 459
 460 static inline int int_urb_interval(struct usb_device *udev)
 461 {
 462         switch (udev->speed) {
 463         case USB_SPEED_HIGH:
 464                 return 4;
 465         case USB_SPEED_LOW:
 466                 return 10;
 467         case USB_SPEED_FULL:
 468         default:
 469                 return 1;
 470         }
 471 }
 472
 473 static inline int usb_int_enabled(struct zd_usb *usb)
 474 {
 475         unsigned long flags;
 476         struct zd_usb_interrupt *intr = &usb->intr;
 477         struct urb *urb;
 478
 479         spin_lock_irqsave(&intr->lock, flags);
 480         urb = intr->urb;
 481         spin_unlock_irqrestore(&intr->lock, flags);
 482         return urb != NULL;
 483 }
 484
 485 int zd_usb_enable_int(struct zd_usb *usb)
 486 {
 487         int r;
 488         struct usb_device *udev;
 489         struct zd_usb_interrupt *intr = &usb->intr;
 490         void *transfer_buffer = NULL;
 491         struct urb *urb;
 492
 493         dev_dbg_f(zd_usb_dev(usb), "\n");
 494
 495         urb = usb_alloc_urb(0, GFP_NOFS);
 496         if (!urb) {
 497                 r = -ENOMEM;
 498                 goto out;
 499         }
 500
 501         ZD_ASSERT(!irqs_disabled());
 502         spin_lock_irq(&intr->lock);
 503         if (intr->urb) {
 504                 spin_unlock_irq(&intr->lock);
 505                 r = 0;
 506                 goto error_free_urb;
 507         }
 508         intr->urb = urb;
 509         spin_unlock_irq(&intr->lock);
 510
 511         /* TODO: make it a DMA buffer */
 512         r = -ENOMEM;
 513         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_NOFS);
 514         if (!transfer_buffer) {
 515                 dev_dbg_f(zd_usb_dev(usb),
 516                         "couldn't allocate transfer_buffer\n");
 517                 goto error_set_urb_null;
 518         }
 519
 520         udev = zd_usb_to_usbdev(usb);
 521         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 522                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
 523                          int_urb_complete, usb,
 524                          intr->interval);
 525
 526         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 527         r = usb_submit_urb(urb, GFP_NOFS);
 528         if (r) {
 529                 dev_dbg_f(zd_usb_dev(usb),
 530                          "Couldn't submit urb. Error number %d\n", r);
 531                 goto error;
 532         }
 533
 534         return 0;
 535 error:
 536         kfree(transfer_buffer);
 537 error_set_urb_null:
 538         spin_lock_irq(&intr->lock);
 539         intr->urb = NULL;
 540         spin_unlock_irq(&intr->lock);
 541 error_free_urb:
 542         usb_free_urb(urb);
 543 out:
 544         return r;
 545 }
 546
 547 void zd_usb_disable_int(struct zd_usb *usb)
 548 {
 549         unsigned long flags;
 550         struct zd_usb_interrupt *intr = &usb->intr;
 551         struct urb *urb;
 552
 553         spin_lock_irqsave(&intr->lock, flags);
 554         urb = intr->urb;
 555         if (!urb) {
 556                 spin_unlock_irqrestore(&intr->lock, flags);
 557                 return;
 558         }
 559         intr->urb = NULL;
 560         spin_unlock_irqrestore(&intr->lock, flags);
 561
 562         usb_kill_urb(urb);
 563         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 564         usb_free_urb(urb);
 565 }
 566
 567 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 568                              unsigned int length)
 569 {
 570         int i;
 571         struct zd_mac *mac = zd_usb_to_mac(usb);
 572         const struct rx_length_info *length_info;
 573
 574         if (length < sizeof(struct rx_length_info)) {
 575                 /* It's not a complete packet anyhow. */
 576                 return;
 577         }
 578         length_info = (struct rx_length_info *)
 579                 (buffer + length - sizeof(struct rx_length_info));
 580
 581         /* It might be that three frames are merged into a single URB
 582          * transaction. We have to check for the length info tag.
 583          *
 584          * While testing we discovered that length_info might be unaligned,
 585          * because if USB transactions are merged, the last packet will not
 586          * be padded. Unaligned access might also happen if the length_info
 587          * structure is not present.
 588          */
 589         if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
 590         {
 591                 unsigned int l, k, n;
 592                 for (i = 0, l = 0;; i++) {
 593                         k = le16_to_cpu(get_unaligned(&length_info->length[i]));
 594                         n = l+k;
 595                         if (n > length)
 596                                 return;
 597                         zd_mac_rx(mac, buffer+l, k);
 598                         if (i >= 2)
 599                                 return;
 600                         l = (n+3) & ~3;
 601                 }
 602         } else {
 603                 zd_mac_rx(mac, buffer, length);
 604         }
 605 }
 606
 607 static void rx_urb_complete(struct urb *urb)
 608 {
 609         struct zd_usb *usb;
 610         struct zd_usb_rx *rx;
 611         const u8 *buffer;
 612         unsigned int length;
 613
 614         switch (urb->status) {
 615         case 0:
 616                 break;
 617         case -ESHUTDOWN:
 618         case -EINVAL:
 619         case -ENODEV:
 620         case -ENOENT:
 621         case -ECONNRESET:
 622         case -EPIPE:
 623                 return;
 624         default:
 625                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 626                 goto resubmit;
 627         }
 628
 629         buffer = urb->transfer_buffer;
 630         length = urb->actual_length;
 631         usb = urb->context;
 632         rx = &usb->rx;
 633
 634         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 635                 /* If there is an old first fragment, we don't care. */
 636                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 637                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 638                 spin_lock(&rx->lock);
 639                 memcpy(rx->fragment, buffer, length);
 640                 rx->fragment_length = length;
 641                 spin_unlock(&rx->lock);
 642                 goto resubmit;
 643         }
 644
 645         spin_lock(&rx->lock);
 646         if (rx->fragment_length > 0) {
 647                 /* We are on a second fragment, we believe */
 648                 ZD_ASSERT(length + rx->fragment_length <=
 649                           ARRAY_SIZE(rx->fragment));
 650                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 651                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 652                 handle_rx_packet(usb, rx->fragment,
 653                                  rx->fragment_length + length);
 654                 rx->fragment_length = 0;
 655                 spin_unlock(&rx->lock);
 656         } else {
 657                 spin_unlock(&rx->lock);
 658                 handle_rx_packet(usb, buffer, length);
 659         }
 660
 661 resubmit:
 662         usb_submit_urb(urb, GFP_ATOMIC);
 663 }
 664
 665 static struct urb *alloc_urb(struct zd_usb *usb)
 666 {
 667         struct usb_device *udev = zd_usb_to_usbdev(usb);
 668         struct urb *urb;
 669         void *buffer;
 670
 671         urb = usb_alloc_urb(0, GFP_NOFS);
 672         if (!urb)
 673                 return NULL;
 674         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_NOFS,
 675                                   &urb->transfer_dma);
 676         if (!buffer) {
 677                 usb_free_urb(urb);
 678                 return NULL;
 679         }
 680
 681         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 682                           buffer, USB_MAX_RX_SIZE,
 683                           rx_urb_complete, usb);
 684         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 685
 686         return urb;
 687 }
 688
 689 static void free_urb(struct urb *urb)
 690 {
 691         if (!urb)
 692                 return;
 693         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 694                         urb->transfer_buffer, urb->transfer_dma);
 695         usb_free_urb(urb);
 696 }
 697
 698 int zd_usb_enable_rx(struct zd_usb *usb)
 699 {
 700         int i, r;
 701         struct zd_usb_rx *rx = &usb->rx;
 702         struct urb **urbs;
 703
 704         dev_dbg_f(zd_usb_dev(usb), "\n");
 705
 706         r = -ENOMEM;
 707         urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_NOFS);
 708         if (!urbs)
 709                 goto error;
 710         for (i = 0; i < URBS_COUNT; i++) {
 711                 urbs[i] = alloc_urb(usb);
 712                 if (!urbs[i])
 713                         goto error;
 714         }
 715
 716         ZD_ASSERT(!irqs_disabled());
 717         spin_lock_irq(&rx->lock);
 718         if (rx->urbs) {
 719                 spin_unlock_irq(&rx->lock);
 720                 r = 0;
 721                 goto error;
 722         }
 723         rx->urbs = urbs;
 724         rx->urbs_count = URBS_COUNT;
 725         spin_unlock_irq(&rx->lock);
 726
 727         for (i = 0; i < URBS_COUNT; i++) {
 728                 r = usb_submit_urb(urbs[i], GFP_NOFS);
 729                 if (r)
 730                         goto error_submit;
 731         }
 732
 733         return 0;
 734 error_submit:
 735         for (i = 0; i < URBS_COUNT; i++) {
 736                 usb_kill_urb(urbs[i]);
 737         }
 738         spin_lock_irq(&rx->lock);
 739         rx->urbs = NULL;
 740         rx->urbs_count = 0;
 741         spin_unlock_irq(&rx->lock);
 742 error:
 743         if (urbs) {
 744                 for (i = 0; i < URBS_COUNT; i++)
 745                         free_urb(urbs[i]);
 746         }
 747         return r;
 748 }
 749
 750 void zd_usb_disable_rx(struct zd_usb *usb)
 751 {
 752         int i;
 753         unsigned long flags;
 754         struct urb **urbs;
 755         unsigned int count;
 756         struct zd_usb_rx *rx = &usb->rx;
 757
 758         spin_lock_irqsave(&rx->lock, flags);
 759         urbs = rx->urbs;
 760         count = rx->urbs_count;
 761         spin_unlock_irqrestore(&rx->lock, flags);
 762         if (!urbs)
 763                 return;
 764
 765         for (i = 0; i < count; i++) {
 766                 usb_kill_urb(urbs[i]);
 767                 free_urb(urbs[i]);
 768         }
 769         kfree(urbs);
 770
 771         spin_lock_irqsave(&rx->lock, flags);
 772         rx->urbs = NULL;
 773         rx->urbs_count = 0;
 774         spin_unlock_irqrestore(&rx->lock, flags);
 775 }
 776
 777 static void tx_urb_complete(struct urb *urb)
 778 {
 779         int r;
 780
 781         switch (urb->status) {
 782         case 0:
 783                 break;
 784         case -ESHUTDOWN:
 785         case -EINVAL:
 786         case -ENODEV:
 787         case -ENOENT:
 788         case -ECONNRESET:
 789         case -EPIPE:
 790                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 791                 break;
 792         default:
 793                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 794                 goto resubmit;
 795         }
 796 free_urb:
 797         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 798                         urb->transfer_buffer, urb->transfer_dma);
 799         usb_free_urb(urb);
 800         return;
 801 resubmit:
 802         r = usb_submit_urb(urb, GFP_ATOMIC);
 803         if (r) {
 804                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 805                 goto free_urb;
 806         }
 807 }
 808
 809 /* Puts the frame on the USB endpoint. It doesn't wait for
 810  * completion. The frame must contain the control set.
 811  */
 812 int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
 813 {
 814         int r;
 815         struct usb_device *udev = zd_usb_to_usbdev(usb);
 816         struct urb *urb;
 817         void *buffer;
 818
 819         urb = usb_alloc_urb(0, GFP_ATOMIC);
 820         if (!urb) {
 821                 r = -ENOMEM;
 822                 goto out;
 823         }
 824
 825         buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
 826                                   &urb->transfer_dma);
 827         if (!buffer) {
 828                 r = -ENOMEM;
 829                 goto error_free_urb;
 830         }
 831         memcpy(buffer, frame, length);
 832
 833         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 834                           buffer, length, tx_urb_complete, NULL);
 835         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 836
 837         r = usb_submit_urb(urb, GFP_ATOMIC);
 838         if (r)
 839                 goto error;
 840         return 0;
 841 error:
 842         usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
 843                         urb->transfer_dma);
 844 error_free_urb:
 845         usb_free_urb(urb);
 846 out:
 847         return r;
 848 }
 849
 850 static inline void init_usb_interrupt(struct zd_usb *usb)
 851 {
 852         struct zd_usb_interrupt *intr = &usb->intr;
 853
 854         spin_lock_init(&intr->lock);
 855         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 856         init_completion(&intr->read_regs.completion);
 857         intr->read_regs.cr_int_addr = cpu_to_le16(usb_addr(usb, CR_INTERRUPT));
 858 }
 859
 860 static inline void init_usb_rx(struct zd_usb *usb)
 861 {
 862         struct zd_usb_rx *rx = &usb->rx;
 863         spin_lock_init(&rx->lock);
 864         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 865                 rx->usb_packet_size = 512;
 866         } else {
 867                 rx->usb_packet_size = 64;
 868         }
 869         ZD_ASSERT(rx->fragment_length == 0);
 870 }
 871
 872 static inline void init_usb_tx(struct zd_usb *usb)
 873 {
 874         /* FIXME: at this point we will allocate a fixed number of urb's for
 875          * use in a cyclic scheme */
 876 }
 877
 878 void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
 879                  struct usb_interface *intf)
 880 {
 881         memset(usb, 0, sizeof(*usb));
 882         usb->intf = usb_get_intf(intf);
 883         usb_set_intfdata(usb->intf, netdev);
 884         init_usb_interrupt(usb);
 885         init_usb_tx(usb);
 886         init_usb_rx(usb);
 887 }
 888
 889 int zd_usb_init_hw(struct zd_usb *usb)
 890 {
 891         int r;
 892         struct zd_chip *chip = zd_usb_to_chip(usb);
 893
 894         ZD_ASSERT(mutex_is_locked(&chip->mutex));
 895         r = zd_ioread16_locked(chip, &usb->fw_base_offset,
 896                         USB_REG((u16)FW_BASE_ADDR_OFFSET));
 897         if (r)
 898                 return r;
 899         dev_dbg_f(zd_usb_dev(usb), "fw_base_offset: %#06hx\n",
 900                  usb->fw_base_offset);
 901
 902         return 0;
 903 }
 904
 905 void zd_usb_clear(struct zd_usb *usb)
 906 {
 907         usb_set_intfdata(usb->intf, NULL);
 908         usb_put_intf(usb->intf);
 909         ZD_MEMCLEAR(usb, sizeof(*usb));
 910         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
 911 }
 912
 913 static const char *speed(enum usb_device_speed speed)
 914 {
 915         switch (speed) {
 916         case USB_SPEED_LOW:
 917                 return "low";
 918         case USB_SPEED_FULL:
 919                 return "full";
 920         case USB_SPEED_HIGH:
 921                 return "high";
 922         default:
 923                 return "unknown speed";
 924         }
 925 }
 926
 927 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
 928 {
 929         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
 930                 le16_to_cpu(udev->descriptor.idVendor),
 931                 le16_to_cpu(udev->descriptor.idProduct),
 932                 get_bcdDevice(udev),
 933                 speed(udev->speed));
 934 }
 935
 936 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
 937 {
 938         struct usb_device *udev = interface_to_usbdev(usb->intf);
 939         return scnprint_id(udev, buffer, size);
 940 }
 941
 942 #ifdef DEBUG
 943 static void print_id(struct usb_device *udev)
 944 {
 945         char buffer[40];
 946
 947         scnprint_id(udev, buffer, sizeof(buffer));
 948         buffer[sizeof(buffer)-1] = 0;
 949         dev_dbg_f(&udev->dev, "%s\n", buffer);
 950 }
 951 #else
 952 #define print_id(udev) do { } while (0)
 953 #endif
 954
 955 static int eject_installer(struct usb_interface *intf)
 956 {
 957         struct usb_device *udev = interface_to_usbdev(intf);
 958         struct usb_host_interface *iface_desc = &intf->altsetting[0];
 959         struct usb_endpoint_descriptor *endpoint;
 960         unsigned char *cmd;
 961         u8 bulk_out_ep;
 962         int r;
 963
 964         /* Find bulk out endpoint */
 965         endpoint = &iface_desc->endpoint[1].desc;
 966         if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
 967             (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
 968             USB_ENDPOINT_XFER_BULK) {
 969                 bulk_out_ep = endpoint->bEndpointAddress;
 970         } else {
 971                 dev_err(&udev->dev,
 972                         "zd1211rw: Could not find bulk out endpoint\n");
 973                 return -ENODEV;
 974         }
 975
 976         cmd = kzalloc(31, GFP_KERNEL);
 977         if (cmd == NULL)
 978                 return -ENODEV;
 979
 980         /* USB bulk command block */
 981         cmd[0] = 0x55;  /* bulk command signature */
 982         cmd[1] = 0x53;  /* bulk command signature */
 983         cmd[2] = 0x42;  /* bulk command signature */
 984         cmd[3] = 0x43;  /* bulk command signature */
 985         cmd[14] = 6;    /* command length */
 986
 987         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
 988         cmd[19] = 0x2;  /* eject disc */
 989
 990         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
 991         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
 992                 cmd, 31, NULL, 2000);
 993         kfree(cmd);
 994         if (r)
 995                 return r;
 996
 997         /* At this point, the device disconnects and reconnects with the real
 998          * ID numbers. */
 999
1000         usb_set_intfdata(intf, NULL);
1001         return 0;
1002 }
1003
1004 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1005 {
1006         int r;
1007         struct usb_device *udev = interface_to_usbdev(intf);
1008         struct net_device *netdev = NULL;
1009
1010         print_id(udev);
1011
1012         if (id->driver_info & DEVICE_INSTALLER)
1013                 return eject_installer(intf);
1014
1015         switch (udev->speed) {
1016         case USB_SPEED_LOW:
1017         case USB_SPEED_FULL:
1018         case USB_SPEED_HIGH:
1019                 break;
1020         default:
1021                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1022                 r = -ENODEV;
1023                 goto error;
1024         }
1025
1026         netdev = zd_netdev_alloc(intf);
1027         if (netdev == NULL) {
1028                 r = -ENOMEM;
1029                 goto error;
1030         }
1031
1032         r = upload_firmware(udev, id->driver_info);
1033         if (r) {
1034                 dev_err(&intf->dev,
1035                        "couldn't load firmware. Error number %d\n", r);
1036                 goto error;
1037         }
1038
1039         r = usb_reset_configuration(udev);
1040         if (r) {
1041                 dev_dbg_f(&intf->dev,
1042                         "couldn't reset configuration. Error number %d\n", r);
1043                 goto error;
1044         }
1045
1046         /* At this point the interrupt endpoint is not generally enabled. We
1047          * save the USB bandwidth until the network device is opened. But
1048          * notify that the initialization of the MAC will require the
1049          * interrupts to be temporary enabled.
1050          */
1051         r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
1052         if (r) {
1053                 dev_dbg_f(&intf->dev,
1054                          "couldn't initialize mac. Error number %d\n", r);
1055                 goto error;
1056         }
1057
1058         r = register_netdev(netdev);
1059         if (r) {
1060                 dev_dbg_f(&intf->dev,
1061                          "couldn't register netdev. Error number %d\n", r);
1062                 goto error;
1063         }
1064
1065         dev_dbg_f(&intf->dev, "successful\n");
1066         dev_info(&intf->dev,"%s\n", netdev->name);
1067         return 0;
1068 error:
1069         usb_reset_device(interface_to_usbdev(intf));
1070         zd_netdev_free(netdev);
1071         return r;
1072 }
1073
1074 static void disconnect(struct usb_interface *intf)
1075 {
1076         struct net_device *netdev = zd_intf_to_netdev(intf);
1077         struct zd_mac *mac = zd_netdev_mac(netdev);
1078         struct zd_usb *usb = &mac->chip.usb;
1079
1080         /* Either something really bad happened, or we're just dealing with
1081          * a DEVICE_INSTALLER. */
1082         if (netdev == NULL)
1083                 return;
1084
1085         dev_dbg_f(zd_usb_dev(usb), "\n");
1086
1087         zd_netdev_disconnect(netdev);
1088
1089         /* Just in case something has gone wrong! */
1090         zd_usb_disable_rx(usb);
1091         zd_usb_disable_int(usb);
1092
1093         /* If the disconnect has been caused by a removal of the
1094          * driver module, the reset allows reloading of the driver. If the
1095          * reset will not be executed here, the upload of the firmware in the
1096          * probe function caused by the reloading of the driver will fail.
1097          */
1098         usb_reset_device(interface_to_usbdev(intf));
1099
1100         zd_netdev_free(netdev);
1101         dev_dbg(&intf->dev, "disconnected\n");
1102 }
1103
1104 static struct usb_driver driver = {
1105         .name           = "zd1211rw",
1106         .id_table       = usb_ids,
1107         .probe          = probe,
1108         .disconnect     = disconnect,
1109 };
1110
1111 struct workqueue_struct *zd_workqueue;
1112
1113 static int __init usb_init(void)
1114 {
1115         int r;
1116
1117         pr_debug("usb_init()\n");
1118
1119         zd_workqueue = create_singlethread_workqueue(driver.name);
1120         if (zd_workqueue == NULL) {
1121                 printk(KERN_ERR "%s: couldn't create workqueue\n", driver.name);
1122                 return -ENOMEM;
1123         }
1124
1125         r = usb_register(&driver);
1126         if (r) {
1127                 printk(KERN_ERR "usb_register() failed. Error number %d\n", r);
1128                 return r;
1129         }
1130
1131         pr_debug("zd1211rw initialized\n");
1132         return 0;
1133 }
1134
1135 static void __exit usb_exit(void)
1136 {
1137         pr_debug("usb_exit()\n");
1138         usb_deregister(&driver);
1139         destroy_workqueue(zd_workqueue);
1140 }
1141
1142 module_init(usb_init);
1143 module_exit(usb_exit);
1144
1145 static int usb_int_regs_length(unsigned int count)
1146 {
1147         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1148 }
1149
1150 static void prepare_read_regs_int(struct zd_usb *usb)
1151 {
1152         struct zd_usb_interrupt *intr = &usb->intr;
1153
1154         spin_lock_irq(&intr->lock);
1155         intr->read_regs_enabled = 1;
1156         INIT_COMPLETION(intr->read_regs.completion);
1157         spin_unlock_irq(&intr->lock);
1158 }
1159
1160 static void disable_read_regs_int(struct zd_usb *usb)
1161 {
1162         struct zd_usb_interrupt *intr = &usb->intr;
1163
1164         spin_lock_irq(&intr->lock);
1165         intr->read_regs_enabled = 0;
1166         spin_unlock_irq(&intr->lock);
1167 }
1168
1169 static int get_results(struct zd_usb *usb, u16 *values,
1170                        struct usb_req_read_regs *req, unsigned int count)
1171 {
1172         int r;
1173         int i;
1174         struct zd_usb_interrupt *intr = &usb->intr;
1175         struct read_regs_int *rr = &intr->read_regs;
1176         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1177
1178         spin_lock_irq(&intr->lock);
1179
1180         r = -EIO;
1181         /* The created block size seems to be larger than expected.
1182          * However results appear to be correct.
1183          */
1184         if (rr->length < usb_int_regs_length(count)) {
1185                 dev_dbg_f(zd_usb_dev(usb),
1186                          "error: actual length %d less than expected %d\n",
1187                          rr->length, usb_int_regs_length(count));
1188                 goto error_unlock;
1189         }
1190         if (rr->length > sizeof(rr->buffer)) {
1191                 dev_dbg_f(zd_usb_dev(usb),
1192                          "error: actual length %d exceeds buffer size %zu\n",
1193                          rr->length, sizeof(rr->buffer));
1194                 goto error_unlock;
1195         }
1196
1197         for (i = 0; i < count; i++) {
1198                 struct reg_data *rd = &regs->regs[i];
1199                 if (rd->addr != req->addr[i]) {
1200                         dev_dbg_f(zd_usb_dev(usb),
1201                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1202                                  le16_to_cpu(rd->addr),
1203                                  le16_to_cpu(req->addr[i]));
1204                         goto error_unlock;
1205                 }
1206                 values[i] = le16_to_cpu(rd->value);
1207         }
1208
1209         r = 0;
1210 error_unlock:
1211         spin_unlock_irq(&intr->lock);
1212         return r;
1213 }
1214
1215 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1216                      const zd_addr_t *addresses, unsigned int count)
1217 {
1218         int r;
1219         int i, req_len, actual_req_len;
1220         struct usb_device *udev;
1221         struct usb_req_read_regs *req = NULL;
1222         unsigned long timeout;
1223
1224         if (count < 1) {
1225                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1226                 return -EINVAL;
1227         }
1228         if (count > USB_MAX_IOREAD16_COUNT) {
1229                 dev_dbg_f(zd_usb_dev(usb),
1230                          "error: count %u exceeds possible max %u\n",
1231                          count, USB_MAX_IOREAD16_COUNT);
1232                 return -EINVAL;
1233         }
1234         if (in_atomic()) {
1235                 dev_dbg_f(zd_usb_dev(usb),
1236                          "error: io in atomic context not supported\n");
1237                 return -EWOULDBLOCK;
1238         }
1239         if (!usb_int_enabled(usb)) {
1240                  dev_dbg_f(zd_usb_dev(usb),
1241                           "error: usb interrupt not enabled\n");
1242                 return -EWOULDBLOCK;
1243         }
1244
1245         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1246         req = kmalloc(req_len, GFP_NOFS);
1247         if (!req)
1248                 return -ENOMEM;
1249         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1250         for (i = 0; i < count; i++)
1251                 req->addr[i] = cpu_to_le16(usb_addr(usb, addresses[i]));
1252
1253         udev = zd_usb_to_usbdev(usb);
1254         prepare_read_regs_int(usb);
1255         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1256                          req, req_len, &actual_req_len, 1000 /* ms */);
1257         if (r) {
1258                 dev_dbg_f(zd_usb_dev(usb),
1259                         "error in usb_bulk_msg(). Error number %d\n", r);
1260                 goto error;
1261         }
1262         if (req_len != actual_req_len) {
1263                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1264                         " req_len %d != actual_req_len %d\n",
1265                         req_len, actual_req_len);
1266                 r = -EIO;
1267                 goto error;
1268         }
1269
1270         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1271                                               msecs_to_jiffies(1000));
1272         if (!timeout) {
1273                 disable_read_regs_int(usb);
1274                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1275                 r = -ETIMEDOUT;
1276                 goto error;
1277         }
1278
1279         r = get_results(usb, values, req, count);
1280 error:
1281         kfree(req);
1282         return r;
1283 }
1284
1285 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1286                       unsigned int count)
1287 {
1288         int r;
1289         struct usb_device *udev;
1290         struct usb_req_write_regs *req = NULL;
1291         int i, req_len, actual_req_len;
1292
1293         if (count == 0)
1294                 return 0;
1295         if (count > USB_MAX_IOWRITE16_COUNT) {
1296                 dev_dbg_f(zd_usb_dev(usb),
1297                         "error: count %u exceeds possible max %u\n",
1298                         count, USB_MAX_IOWRITE16_COUNT);
1299                 return -EINVAL;
1300         }
1301         if (in_atomic()) {
1302                 dev_dbg_f(zd_usb_dev(usb),
1303                         "error: io in atomic context not supported\n");
1304                 return -EWOULDBLOCK;
1305         }
1306
1307         req_len = sizeof(struct usb_req_write_regs) +
1308                   count * sizeof(struct reg_data);
1309         req = kmalloc(req_len, GFP_NOFS);
1310         if (!req)
1311                 return -ENOMEM;
1312
1313         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1314         for (i = 0; i < count; i++) {
1315                 struct reg_data *rw  = &req->reg_writes[i];
1316                 rw->addr = cpu_to_le16(usb_addr(usb, ioreqs[i].addr));
1317                 rw->value = cpu_to_le16(ioreqs[i].value);
1318         }
1319
1320         udev = zd_usb_to_usbdev(usb);
1321         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1322                          req, req_len, &actual_req_len, 1000 /* ms */);
1323         if (r) {
1324                 dev_dbg_f(zd_usb_dev(usb),
1325                         "error in usb_bulk_msg(). Error number %d\n", r);
1326                 goto error;
1327         }
1328         if (req_len != actual_req_len) {
1329                 dev_dbg_f(zd_usb_dev(usb),
1330                         "error in usb_bulk_msg()"
1331                         " req_len %d != actual_req_len %d\n",
1332                         req_len, actual_req_len);
1333                 r = -EIO;
1334                 goto error;
1335         }
1336
1337         /* FALL-THROUGH with r == 0 */
1338 error:
1339         kfree(req);
1340         return r;
1341 }
1342
1343 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1344 {
1345         int r;
1346         struct usb_device *udev;
1347         struct usb_req_rfwrite *req = NULL;
1348         int i, req_len, actual_req_len;
1349         u16 bit_value_template;
1350
1351         if (in_atomic()) {
1352                 dev_dbg_f(zd_usb_dev(usb),
1353                         "error: io in atomic context not supported\n");
1354                 return -EWOULDBLOCK;
1355         }
1356         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1357                 dev_dbg_f(zd_usb_dev(usb),
1358                         "error: bits %d are smaller than"
1359                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1360                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1361                 return -EINVAL;
1362         }
1363         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1364                 dev_dbg_f(zd_usb_dev(usb),
1365                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1366                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1367                 return -EINVAL;
1368         }
1369 #ifdef DEBUG
1370         if (value & (~0UL << bits)) {
1371                 dev_dbg_f(zd_usb_dev(usb),
1372                         "error: value %#09x has bits >= %d set\n",
1373                         value, bits);
1374                 return -EINVAL;
1375         }
1376 #endif /* DEBUG */
1377
1378         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1379
1380         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1381         if (r) {
1382                 dev_dbg_f(zd_usb_dev(usb),
1383                         "error %d: Couldn't read CR203\n", r);
1384                 goto out;
1385         }
1386         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1387
1388         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1389         req = kmalloc(req_len, GFP_NOFS);
1390         if (!req)
1391                 return -ENOMEM;
1392
1393         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1394         /* 1: 3683a, but not used in ZYDAS driver */
1395         req->value = cpu_to_le16(2);
1396         req->bits = cpu_to_le16(bits);
1397
1398         for (i = 0; i < bits; i++) {
1399                 u16 bv = bit_value_template;
1400                 if (value & (1 << (bits-1-i)))
1401                         bv |= RF_DATA;
1402                 req->bit_values[i] = cpu_to_le16(bv);
1403         }
1404
1405         udev = zd_usb_to_usbdev(usb);
1406         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1407                          req, req_len, &actual_req_len, 1000 /* ms */);
1408         if (r) {
1409                 dev_dbg_f(zd_usb_dev(usb),
1410                         "error in usb_bulk_msg(). Error number %d\n", r);
1411                 goto out;
1412         }
1413         if (req_len != actual_req_len) {
1414                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1415                         " req_len %d != actual_req_len %d\n",
1416                         req_len, actual_req_len);
1417                 r = -EIO;
1418                 goto out;
1419         }
1420
1421         /* FALL-THROUGH with r == 0 */
1422 out:
1423         kfree(req);
1424         return r;
1425 }