SAFE public projects git trees. - safe/jmp/linux-2.6/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         /* ZD1211B */
  54         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  55         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  56         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  57         { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
  58         /* "Driverless" devices that need ejecting */
  59         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
  60         {}
  61 };
  62
  63 MODULE_LICENSE("GPL");
  64 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
  65 MODULE_AUTHOR("Ulrich Kunitz");
  66 MODULE_AUTHOR("Daniel Drake");
  67 MODULE_VERSION("1.0");
  68 MODULE_DEVICE_TABLE(usb, usb_ids);
  69
  70 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
  71 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
  72
  73 /* register address handling */
  74
  75 #ifdef DEBUG
  76 static int check_addr(struct zd_usb *usb, zd_addr_t addr)
  77 {
  78         u32 base = ZD_ADDR_BASE(addr);
  79         u32 offset = ZD_OFFSET(addr);
  80
  81         if ((u32)addr & ADDR_ZERO_MASK)
  82                 goto invalid_address;
  83         switch (base) {
  84         case USB_BASE:
  85                 break;
  86         case CR_BASE:
  87                 if (offset > CR_MAX_OFFSET) {
  88                         dev_dbg(zd_usb_dev(usb),
  89                                 "CR offset %#010x larger than"
  90                                 " CR_MAX_OFFSET %#10x\n",
  91                                 offset, CR_MAX_OFFSET);
  92                         goto invalid_address;
  93                 }
  94                 if (offset & 1) {
  95                         dev_dbg(zd_usb_dev(usb),
  96                                 "CR offset %#010x is not a multiple of 2\n",
  97                                 offset);
  98                         goto invalid_address;
  99                 }
 100                 break;
 101         case E2P_BASE:
 102                 if (offset > E2P_MAX_OFFSET) {
 103                         dev_dbg(zd_usb_dev(usb),
 104                                 "E2P offset %#010x larger than"
 105                                 " E2P_MAX_OFFSET %#010x\n",
 106                                 offset, E2P_MAX_OFFSET);
 107                         goto invalid_address;
 108                 }
 109                 break;
 110         case FW_BASE:
 111                 if (!usb->fw_base_offset) {
 112                         dev_dbg(zd_usb_dev(usb),
 113                                "ERROR: fw base offset has not been set\n");
 114                         return -EAGAIN;
 115                 }
 116                 if (offset > FW_MAX_OFFSET) {
 117                         dev_dbg(zd_usb_dev(usb),
 118                                 "FW offset %#10x is larger than"
 119                                 " FW_MAX_OFFSET %#010x\n",
 120                                 offset, FW_MAX_OFFSET);
 121                         goto invalid_address;
 122                 }
 123                 break;
 124         default:
 125                 dev_dbg(zd_usb_dev(usb),
 126                         "address has unsupported base %#010x\n", addr);
 127                 goto invalid_address;
 128         }
 129
 130         return 0;
 131 invalid_address:
 132         dev_dbg(zd_usb_dev(usb),
 133                 "ERROR: invalid address: %#010x\n", addr);
 134         return -EINVAL;
 135 }
 136 #endif /* DEBUG */
 137
 138 static u16 usb_addr(struct zd_usb *usb, zd_addr_t addr)
 139 {
 140         u32 base;
 141         u16 offset;
 142
 143         base = ZD_ADDR_BASE(addr);
 144         offset = ZD_OFFSET(addr);
 145
 146         ZD_ASSERT(check_addr(usb, addr) == 0);
 147
 148         switch (base) {
 149         case CR_BASE:
 150                 offset += CR_BASE_OFFSET;
 151                 break;
 152         case E2P_BASE:
 153                 offset += E2P_BASE_OFFSET;
 154                 break;
 155         case FW_BASE:
 156                 offset += usb->fw_base_offset;
 157                 break;
 158         }
 159
 160         return offset;
 161 }
 162
 163 /* USB device initialization */
 164
 165 static int request_fw_file(
 166         const struct firmware **fw, const char *name, struct device *device)
 167 {
 168         int r;
 169
 170         dev_dbg_f(device, "fw name %s\n", name);
 171
 172         r = request_firmware(fw, name, device);
 173         if (r)
 174                 dev_err(device,
 175                        "Could not load firmware file %s. Error number %d\n",
 176                        name, r);
 177         return r;
 178 }
 179
 180 static inline u16 get_bcdDevice(const struct usb_device *udev)
 181 {
 182         return le16_to_cpu(udev->descriptor.bcdDevice);
 183 }
 184
 185 enum upload_code_flags {
 186         REBOOT = 1,
 187 };
 188
 189 /* Ensures that MAX_TRANSFER_SIZE is even. */
 190 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 191
 192 static int upload_code(struct usb_device *udev,
 193         const u8 *data, size_t size, u16 code_offset, int flags)
 194 {
 195         u8 *p;
 196         int r;
 197
 198         /* USB request blocks need "kmalloced" buffers.
 199          */
 200         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 201         if (!p) {
 202                 dev_err(&udev->dev, "out of memory\n");
 203                 r = -ENOMEM;
 204                 goto error;
 205         }
 206
 207         size &= ~1;
 208         while (size > 0) {
 209                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 210                         size : MAX_TRANSFER_SIZE;
 211
 212                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 213
 214                 memcpy(p, data, transfer_size);
 215                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 216                         USB_REQ_FIRMWARE_DOWNLOAD,
 217                         USB_DIR_OUT | USB_TYPE_VENDOR,
 218                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 219                 if (r < 0) {
 220                         dev_err(&udev->dev,
 221                                "USB control request for firmware upload"
 222                                " failed. Error number %d\n", r);
 223                         goto error;
 224                 }
 225                 transfer_size = r & ~1;
 226
 227                 size -= transfer_size;
 228                 data += transfer_size;
 229                 code_offset += transfer_size/sizeof(u16);
 230         }
 231
 232         if (flags & REBOOT) {
 233                 u8 ret;
 234
 235                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 236                         USB_REQ_FIRMWARE_CONFIRM,
 237                         USB_DIR_IN | USB_TYPE_VENDOR,
 238                         0, 0, &ret, sizeof(ret), 5000 /* ms */);
 239                 if (r != sizeof(ret)) {
 240                         dev_err(&udev->dev,
 241                                 "control request firmeware confirmation failed."
 242                                 " Return value %d\n", r);
 243                         if (r >= 0)
 244                                 r = -ENODEV;
 245                         goto error;
 246                 }
 247                 if (ret & 0x80) {
 248                         dev_err(&udev->dev,
 249                                 "Internal error while downloading."
 250                                 " Firmware confirm return value %#04x\n",
 251                                 (unsigned int)ret);
 252                         r = -ENODEV;
 253                         goto error;
 254                 }
 255                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 256                         (unsigned int)ret);
 257         }
 258
 259         r = 0;
 260 error:
 261         kfree(p);
 262         return r;
 263 }
 264
 265 static u16 get_word(const void *data, u16 offset)
 266 {
 267         const __le16 *p = data;
 268         return le16_to_cpu(p[offset]);
 269 }
 270
 271 static char *get_fw_name(char *buffer, size_t size, u8 device_type,
 272                        const char* postfix)
 273 {
 274         scnprintf(buffer, size, "%s%s",
 275                 device_type == DEVICE_ZD1211B ?
 276                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 277                 postfix);
 278         return buffer;
 279 }
 280
 281 static int handle_version_mismatch(struct usb_device *udev, u8 device_type,
 282         const struct firmware *ub_fw)
 283 {
 284         const struct firmware *ur_fw = NULL;
 285         int offset;
 286         int r = 0;
 287         char fw_name[128];
 288
 289         r = request_fw_file(&ur_fw,
 290                 get_fw_name(fw_name, sizeof(fw_name), device_type, "ur"),
 291                 &udev->dev);
 292         if (r)
 293                 goto error;
 294
 295         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START_OFFSET,
 296                 REBOOT);
 297         if (r)
 298                 goto error;
 299
 300         offset = ((EEPROM_REGS_OFFSET + EEPROM_REGS_SIZE) * sizeof(u16));
 301         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
 302                 E2P_BASE_OFFSET + EEPROM_REGS_SIZE, REBOOT);
 303
 304         /* At this point, the vendor driver downloads the whole firmware
 305          * image, hacks around with version IDs, and uploads it again,
 306          * completely overwriting the boot code. We do not do this here as
 307          * it is not required on any tested devices, and it is suspected to
 308          * cause problems. */
 309 error:
 310         release_firmware(ur_fw);
 311         return r;
 312 }
 313
 314 static int upload_firmware(struct usb_device *udev, u8 device_type)
 315 {
 316         int r;
 317         u16 fw_bcdDevice;
 318         u16 bcdDevice;
 319         const struct firmware *ub_fw = NULL;
 320         const struct firmware *uph_fw = NULL;
 321         char fw_name[128];
 322
 323         bcdDevice = get_bcdDevice(udev);
 324
 325         r = request_fw_file(&ub_fw,
 326                 get_fw_name(fw_name, sizeof(fw_name), device_type,  "ub"),
 327                 &udev->dev);
 328         if (r)
 329                 goto error;
 330
 331         fw_bcdDevice = get_word(ub_fw->data, EEPROM_REGS_OFFSET);
 332
 333         if (fw_bcdDevice != bcdDevice) {
 334                 dev_info(&udev->dev,
 335                         "firmware version %#06x and device bootcode version "
 336                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
 337                 if (bcdDevice <= 0x4313)
 338                         dev_warn(&udev->dev, "device has old bootcode, please "
 339                                 "report success or failure\n");
 340
 341                 r = handle_version_mismatch(udev, device_type, ub_fw);
 342                 if (r)
 343                         goto error;
 344         } else {
 345                 dev_dbg_f(&udev->dev,
 346                         "firmware device id %#06x is equal to the "
 347                         "actual device id\n", fw_bcdDevice);
 348         }
 349
 350
 351         r = request_fw_file(&uph_fw,
 352                 get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"),
 353                 &udev->dev);
 354         if (r)
 355                 goto error;
 356
 357         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START_OFFSET,
 358                         REBOOT);
 359         if (r) {
 360                 dev_err(&udev->dev,
 361                         "Could not upload firmware code uph. Error number %d\n",
 362                         r);
 363         }
 364
 365         /* FALL-THROUGH */
 366 error:
 367         release_firmware(ub_fw);
 368         release_firmware(uph_fw);
 369         return r;
 370 }
 371
 372 #define urb_dev(urb) (&(urb)->dev->dev)
 373
 374 static inline void handle_regs_int(struct urb *urb)
 375 {
 376         struct zd_usb *usb = urb->context;
 377         struct zd_usb_interrupt *intr = &usb->intr;
 378         int len;
 379
 380         ZD_ASSERT(in_interrupt());
 381         spin_lock(&intr->lock);
 382
 383         if (intr->read_regs_enabled) {
 384                 intr->read_regs.length = len = urb->actual_length;
 385
 386                 if (len > sizeof(intr->read_regs.buffer))
 387                         len = sizeof(intr->read_regs.buffer);
 388                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 389                 intr->read_regs_enabled = 0;
 390                 complete(&intr->read_regs.completion);
 391                 goto out;
 392         }
 393
 394         dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
 395 out:
 396         spin_unlock(&intr->lock);
 397 }
 398
 399 static inline void handle_retry_failed_int(struct urb *urb)
 400 {
 401         dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
 402 }
 403
 404
 405 static void int_urb_complete(struct urb *urb)
 406 {
 407         int r;
 408         struct usb_int_header *hdr;
 409
 410         switch (urb->status) {
 411         case 0:
 412                 break;
 413         case -ESHUTDOWN:
 414         case -EINVAL:
 415         case -ENODEV:
 416         case -ENOENT:
 417         case -ECONNRESET:
 418         case -EPIPE:
 419                 goto kfree;
 420         default:
 421                 goto resubmit;
 422         }
 423
 424         if (urb->actual_length < sizeof(hdr)) {
 425                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 426                 goto resubmit;
 427         }
 428
 429         hdr = urb->transfer_buffer;
 430         if (hdr->type != USB_INT_TYPE) {
 431                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 432                 goto resubmit;
 433         }
 434
 435         switch (hdr->id) {
 436         case USB_INT_ID_REGS:
 437                 handle_regs_int(urb);
 438                 break;
 439         case USB_INT_ID_RETRY_FAILED:
 440                 handle_retry_failed_int(urb);
 441                 break;
 442         default:
 443                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 444                         (unsigned int)hdr->id);
 445                 goto resubmit;
 446         }
 447
 448 resubmit:
 449         r = usb_submit_urb(urb, GFP_ATOMIC);
 450         if (r) {
 451                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
 452                 goto kfree;
 453         }
 454         return;
 455 kfree:
 456         kfree(urb->transfer_buffer);
 457 }
 458
 459 static inline int int_urb_interval(struct usb_device *udev)
 460 {
 461         switch (udev->speed) {
 462         case USB_SPEED_HIGH:
 463                 return 4;
 464         case USB_SPEED_LOW:
 465                 return 10;
 466         case USB_SPEED_FULL:
 467         default:
 468                 return 1;
 469         }
 470 }
 471
 472 static inline int usb_int_enabled(struct zd_usb *usb)
 473 {
 474         unsigned long flags;
 475         struct zd_usb_interrupt *intr = &usb->intr;
 476         struct urb *urb;
 477
 478         spin_lock_irqsave(&intr->lock, flags);
 479         urb = intr->urb;
 480         spin_unlock_irqrestore(&intr->lock, flags);
 481         return urb != NULL;
 482 }
 483
 484 int zd_usb_enable_int(struct zd_usb *usb)
 485 {
 486         int r;
 487         struct usb_device *udev;
 488         struct zd_usb_interrupt *intr = &usb->intr;
 489         void *transfer_buffer = NULL;
 490         struct urb *urb;
 491
 492         dev_dbg_f(zd_usb_dev(usb), "\n");
 493
 494         urb = usb_alloc_urb(0, GFP_NOFS);
 495         if (!urb) {
 496                 r = -ENOMEM;
 497                 goto out;
 498         }
 499
 500         ZD_ASSERT(!irqs_disabled());
 501         spin_lock_irq(&intr->lock);
 502         if (intr->urb) {
 503                 spin_unlock_irq(&intr->lock);
 504                 r = 0;
 505                 goto error_free_urb;
 506         }
 507         intr->urb = urb;
 508         spin_unlock_irq(&intr->lock);
 509
 510         /* TODO: make it a DMA buffer */
 511         r = -ENOMEM;
 512         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_NOFS);
 513         if (!transfer_buffer) {
 514                 dev_dbg_f(zd_usb_dev(usb),
 515                         "couldn't allocate transfer_buffer\n");
 516                 goto error_set_urb_null;
 517         }
 518
 519         udev = zd_usb_to_usbdev(usb);
 520         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 521                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
 522                          int_urb_complete, usb,
 523                          intr->interval);
 524
 525         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 526         r = usb_submit_urb(urb, GFP_NOFS);
 527         if (r) {
 528                 dev_dbg_f(zd_usb_dev(usb),
 529                          "Couldn't submit urb. Error number %d\n", r);
 530                 goto error;
 531         }
 532
 533         return 0;
 534 error:
 535         kfree(transfer_buffer);
 536 error_set_urb_null:
 537         spin_lock_irq(&intr->lock);
 538         intr->urb = NULL;
 539         spin_unlock_irq(&intr->lock);
 540 error_free_urb:
 541         usb_free_urb(urb);
 542 out:
 543         return r;
 544 }
 545
 546 void zd_usb_disable_int(struct zd_usb *usb)
 547 {
 548         unsigned long flags;
 549         struct zd_usb_interrupt *intr = &usb->intr;
 550         struct urb *urb;
 551
 552         spin_lock_irqsave(&intr->lock, flags);
 553         urb = intr->urb;
 554         if (!urb) {
 555                 spin_unlock_irqrestore(&intr->lock, flags);
 556                 return;
 557         }
 558         intr->urb = NULL;
 559         spin_unlock_irqrestore(&intr->lock, flags);
 560
 561         usb_kill_urb(urb);
 562         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 563         usb_free_urb(urb);
 564 }
 565
 566 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 567                              unsigned int length)
 568 {
 569         int i;
 570         struct zd_mac *mac = zd_usb_to_mac(usb);
 571         const struct rx_length_info *length_info;
 572
 573         if (length < sizeof(struct rx_length_info)) {
 574                 /* It's not a complete packet anyhow. */
 575                 return;
 576         }
 577         length_info = (struct rx_length_info *)
 578                 (buffer + length - sizeof(struct rx_length_info));
 579
 580         /* It might be that three frames are merged into a single URB
 581          * transaction. We have to check for the length info tag.
 582          *
 583          * While testing we discovered that length_info might be unaligned,
 584          * because if USB transactions are merged, the last packet will not
 585          * be padded. Unaligned access might also happen if the length_info
 586          * structure is not present.
 587          */
 588         if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
 589         {
 590                 unsigned int l, k, n;
 591                 for (i = 0, l = 0;; i++) {
 592                         k = le16_to_cpu(get_unaligned(&length_info->length[i]));
 593                         n = l+k;
 594                         if (n > length)
 595                                 return;
 596                         zd_mac_rx(mac, buffer+l, k);
 597                         if (i >= 2)
 598                                 return;
 599                         l = (n+3) & ~3;
 600                 }
 601         } else {
 602                 zd_mac_rx(mac, buffer, length);
 603         }
 604 }
 605
 606 static void rx_urb_complete(struct urb *urb)
 607 {
 608         struct zd_usb *usb;
 609         struct zd_usb_rx *rx;
 610         const u8 *buffer;
 611         unsigned int length;
 612
 613         switch (urb->status) {
 614         case 0:
 615                 break;
 616         case -ESHUTDOWN:
 617         case -EINVAL:
 618         case -ENODEV:
 619         case -ENOENT:
 620         case -ECONNRESET:
 621         case -EPIPE:
 622                 return;
 623         default:
 624                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 625                 goto resubmit;
 626         }
 627
 628         buffer = urb->transfer_buffer;
 629         length = urb->actual_length;
 630         usb = urb->context;
 631         rx = &usb->rx;
 632
 633         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 634                 /* If there is an old first fragment, we don't care. */
 635                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 636                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 637                 spin_lock(&rx->lock);
 638                 memcpy(rx->fragment, buffer, length);
 639                 rx->fragment_length = length;
 640                 spin_unlock(&rx->lock);
 641                 goto resubmit;
 642         }
 643
 644         spin_lock(&rx->lock);
 645         if (rx->fragment_length > 0) {
 646                 /* We are on a second fragment, we believe */
 647                 ZD_ASSERT(length + rx->fragment_length <=
 648                           ARRAY_SIZE(rx->fragment));
 649                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 650                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 651                 handle_rx_packet(usb, rx->fragment,
 652                                  rx->fragment_length + length);
 653                 rx->fragment_length = 0;
 654                 spin_unlock(&rx->lock);
 655         } else {
 656                 spin_unlock(&rx->lock);
 657                 handle_rx_packet(usb, buffer, length);
 658         }
 659
 660 resubmit:
 661         usb_submit_urb(urb, GFP_ATOMIC);
 662 }
 663
 664 static struct urb *alloc_urb(struct zd_usb *usb)
 665 {
 666         struct usb_device *udev = zd_usb_to_usbdev(usb);
 667         struct urb *urb;
 668         void *buffer;
 669
 670         urb = usb_alloc_urb(0, GFP_NOFS);
 671         if (!urb)
 672                 return NULL;
 673         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_NOFS,
 674                                   &urb->transfer_dma);
 675         if (!buffer) {
 676                 usb_free_urb(urb);
 677                 return NULL;
 678         }
 679
 680         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 681                           buffer, USB_MAX_RX_SIZE,
 682                           rx_urb_complete, usb);
 683         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 684
 685         return urb;
 686 }
 687
 688 static void free_urb(struct urb *urb)
 689 {
 690         if (!urb)
 691                 return;
 692         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 693                         urb->transfer_buffer, urb->transfer_dma);
 694         usb_free_urb(urb);
 695 }
 696
 697 int zd_usb_enable_rx(struct zd_usb *usb)
 698 {
 699         int i, r;
 700         struct zd_usb_rx *rx = &usb->rx;
 701         struct urb **urbs;
 702
 703         dev_dbg_f(zd_usb_dev(usb), "\n");
 704
 705         r = -ENOMEM;
 706         urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_NOFS);
 707         if (!urbs)
 708                 goto error;
 709         for (i = 0; i < URBS_COUNT; i++) {
 710                 urbs[i] = alloc_urb(usb);
 711                 if (!urbs[i])
 712                         goto error;
 713         }
 714
 715         ZD_ASSERT(!irqs_disabled());
 716         spin_lock_irq(&rx->lock);
 717         if (rx->urbs) {
 718                 spin_unlock_irq(&rx->lock);
 719                 r = 0;
 720                 goto error;
 721         }
 722         rx->urbs = urbs;
 723         rx->urbs_count = URBS_COUNT;
 724         spin_unlock_irq(&rx->lock);
 725
 726         for (i = 0; i < URBS_COUNT; i++) {
 727                 r = usb_submit_urb(urbs[i], GFP_NOFS);
 728                 if (r)
 729                         goto error_submit;
 730         }
 731
 732         return 0;
 733 error_submit:
 734         for (i = 0; i < URBS_COUNT; i++) {
 735                 usb_kill_urb(urbs[i]);
 736         }
 737         spin_lock_irq(&rx->lock);
 738         rx->urbs = NULL;
 739         rx->urbs_count = 0;
 740         spin_unlock_irq(&rx->lock);
 741 error:
 742         if (urbs) {
 743                 for (i = 0; i < URBS_COUNT; i++)
 744                         free_urb(urbs[i]);
 745         }
 746         return r;
 747 }
 748
 749 void zd_usb_disable_rx(struct zd_usb *usb)
 750 {
 751         int i;
 752         unsigned long flags;
 753         struct urb **urbs;
 754         unsigned int count;
 755         struct zd_usb_rx *rx = &usb->rx;
 756
 757         spin_lock_irqsave(&rx->lock, flags);
 758         urbs = rx->urbs;
 759         count = rx->urbs_count;
 760         spin_unlock_irqrestore(&rx->lock, flags);
 761         if (!urbs)
 762                 return;
 763
 764         for (i = 0; i < count; i++) {
 765                 usb_kill_urb(urbs[i]);
 766                 free_urb(urbs[i]);
 767         }
 768         kfree(urbs);
 769
 770         spin_lock_irqsave(&rx->lock, flags);
 771         rx->urbs = NULL;
 772         rx->urbs_count = 0;
 773         spin_unlock_irqrestore(&rx->lock, flags);
 774 }
 775
 776 static void tx_urb_complete(struct urb *urb)
 777 {
 778         int r;
 779
 780         switch (urb->status) {
 781         case 0:
 782                 break;
 783         case -ESHUTDOWN:
 784         case -EINVAL:
 785         case -ENODEV:
 786         case -ENOENT:
 787         case -ECONNRESET:
 788         case -EPIPE:
 789                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 790                 break;
 791         default:
 792                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 793                 goto resubmit;
 794         }
 795 free_urb:
 796         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 797                         urb->transfer_buffer, urb->transfer_dma);
 798         usb_free_urb(urb);
 799         return;
 800 resubmit:
 801         r = usb_submit_urb(urb, GFP_ATOMIC);
 802         if (r) {
 803                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 804                 goto free_urb;
 805         }
 806 }
 807
 808 /* Puts the frame on the USB endpoint. It doesn't wait for
 809  * completion. The frame must contain the control set.
 810  */
 811 int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
 812 {
 813         int r;
 814         struct usb_device *udev = zd_usb_to_usbdev(usb);
 815         struct urb *urb;
 816         void *buffer;
 817
 818         urb = usb_alloc_urb(0, GFP_ATOMIC);
 819         if (!urb) {
 820                 r = -ENOMEM;
 821                 goto out;
 822         }
 823
 824         buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
 825                                   &urb->transfer_dma);
 826         if (!buffer) {
 827                 r = -ENOMEM;
 828                 goto error_free_urb;
 829         }
 830         memcpy(buffer, frame, length);
 831
 832         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 833                           buffer, length, tx_urb_complete, NULL);
 834         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 835
 836         r = usb_submit_urb(urb, GFP_ATOMIC);
 837         if (r)
 838                 goto error;
 839         return 0;
 840 error:
 841         usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
 842                         urb->transfer_dma);
 843 error_free_urb:
 844         usb_free_urb(urb);
 845 out:
 846         return r;
 847 }
 848
 849 static inline void init_usb_interrupt(struct zd_usb *usb)
 850 {
 851         struct zd_usb_interrupt *intr = &usb->intr;
 852
 853         spin_lock_init(&intr->lock);
 854         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 855         init_completion(&intr->read_regs.completion);
 856         intr->read_regs.cr_int_addr = cpu_to_le16(usb_addr(usb, CR_INTERRUPT));
 857 }
 858
 859 static inline void init_usb_rx(struct zd_usb *usb)
 860 {
 861         struct zd_usb_rx *rx = &usb->rx;
 862         spin_lock_init(&rx->lock);
 863         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 864                 rx->usb_packet_size = 512;
 865         } else {
 866                 rx->usb_packet_size = 64;
 867         }
 868         ZD_ASSERT(rx->fragment_length == 0);
 869 }
 870
 871 static inline void init_usb_tx(struct zd_usb *usb)
 872 {
 873         /* FIXME: at this point we will allocate a fixed number of urb's for
 874          * use in a cyclic scheme */
 875 }
 876
 877 void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
 878                  struct usb_interface *intf)
 879 {
 880         memset(usb, 0, sizeof(*usb));
 881         usb->intf = usb_get_intf(intf);
 882         usb_set_intfdata(usb->intf, netdev);
 883         init_usb_interrupt(usb);
 884         init_usb_tx(usb);
 885         init_usb_rx(usb);
 886 }
 887
 888 int zd_usb_init_hw(struct zd_usb *usb)
 889 {
 890         int r;
 891         struct zd_chip *chip = zd_usb_to_chip(usb);
 892
 893         ZD_ASSERT(mutex_is_locked(&chip->mutex));
 894         r = zd_ioread16_locked(chip, &usb->fw_base_offset,
 895                         USB_REG((u16)FW_BASE_ADDR_OFFSET));
 896         if (r)
 897                 return r;
 898         dev_dbg_f(zd_usb_dev(usb), "fw_base_offset: %#06hx\n",
 899                  usb->fw_base_offset);
 900
 901         return 0;
 902 }
 903
 904 void zd_usb_clear(struct zd_usb *usb)
 905 {
 906         usb_set_intfdata(usb->intf, NULL);
 907         usb_put_intf(usb->intf);
 908         ZD_MEMCLEAR(usb, sizeof(*usb));
 909         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
 910 }
 911
 912 static const char *speed(enum usb_device_speed speed)
 913 {
 914         switch (speed) {
 915         case USB_SPEED_LOW:
 916                 return "low";
 917         case USB_SPEED_FULL:
 918                 return "full";
 919         case USB_SPEED_HIGH:
 920                 return "high";
 921         default:
 922                 return "unknown speed";
 923         }
 924 }
 925
 926 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
 927 {
 928         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
 929                 le16_to_cpu(udev->descriptor.idVendor),
 930                 le16_to_cpu(udev->descriptor.idProduct),
 931                 get_bcdDevice(udev),
 932                 speed(udev->speed));
 933 }
 934
 935 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
 936 {
 937         struct usb_device *udev = interface_to_usbdev(usb->intf);
 938         return scnprint_id(udev, buffer, size);
 939 }
 940
 941 #ifdef DEBUG
 942 static void print_id(struct usb_device *udev)
 943 {
 944         char buffer[40];
 945
 946         scnprint_id(udev, buffer, sizeof(buffer));
 947         buffer[sizeof(buffer)-1] = 0;
 948         dev_dbg_f(&udev->dev, "%s\n", buffer);
 949 }
 950 #else
 951 #define print_id(udev) do { } while (0)
 952 #endif
 953
 954 static int eject_installer(struct usb_interface *intf)
 955 {
 956         struct usb_device *udev = interface_to_usbdev(intf);
 957         struct usb_host_interface *iface_desc = &intf->altsetting[0];
 958         struct usb_endpoint_descriptor *endpoint;
 959         unsigned char *cmd;
 960         u8 bulk_out_ep;
 961         int r;
 962
 963         /* Find bulk out endpoint */
 964         endpoint = &iface_desc->endpoint[1].desc;
 965         if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
 966             (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
 967             USB_ENDPOINT_XFER_BULK) {
 968                 bulk_out_ep = endpoint->bEndpointAddress;
 969         } else {
 970                 dev_err(&udev->dev,
 971                         "zd1211rw: Could not find bulk out endpoint\n");
 972                 return -ENODEV;
 973         }
 974
 975         cmd = kzalloc(31, GFP_KERNEL);
 976         if (cmd == NULL)
 977                 return -ENODEV;
 978
 979         /* USB bulk command block */
 980         cmd[0] = 0x55;  /* bulk command signature */
 981         cmd[1] = 0x53;  /* bulk command signature */
 982         cmd[2] = 0x42;  /* bulk command signature */
 983         cmd[3] = 0x43;  /* bulk command signature */
 984         cmd[14] = 6;    /* command length */
 985
 986         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
 987         cmd[19] = 0x2;  /* eject disc */
 988
 989         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
 990         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
 991                 cmd, 31, NULL, 2000);
 992         kfree(cmd);
 993         if (r)
 994                 return r;
 995
 996         /* At this point, the device disconnects and reconnects with the real
 997          * ID numbers. */
 998
 999         usb_set_intfdata(intf, NULL);
1000         return 0;
1001 }
1002
1003 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1004 {
1005         int r;
1006         struct usb_device *udev = interface_to_usbdev(intf);
1007         struct net_device *netdev = NULL;
1008
1009         print_id(udev);
1010
1011         if (id->driver_info & DEVICE_INSTALLER)
1012                 return eject_installer(intf);
1013
1014         switch (udev->speed) {
1015         case USB_SPEED_LOW:
1016         case USB_SPEED_FULL:
1017         case USB_SPEED_HIGH:
1018                 break;
1019         default:
1020                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1021                 r = -ENODEV;
1022                 goto error;
1023         }
1024
1025         netdev = zd_netdev_alloc(intf);
1026         if (netdev == NULL) {
1027                 r = -ENOMEM;
1028                 goto error;
1029         }
1030
1031         r = upload_firmware(udev, id->driver_info);
1032         if (r) {
1033                 dev_err(&intf->dev,
1034                        "couldn't load firmware. Error number %d\n", r);
1035                 goto error;
1036         }
1037
1038         r = usb_reset_configuration(udev);
1039         if (r) {
1040                 dev_dbg_f(&intf->dev,
1041                         "couldn't reset configuration. Error number %d\n", r);
1042                 goto error;
1043         }
1044
1045         /* At this point the interrupt endpoint is not generally enabled. We
1046          * save the USB bandwidth until the network device is opened. But
1047          * notify that the initialization of the MAC will require the
1048          * interrupts to be temporary enabled.
1049          */
1050         r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
1051         if (r) {
1052                 dev_dbg_f(&intf->dev,
1053                          "couldn't initialize mac. Error number %d\n", r);
1054                 goto error;
1055         }
1056
1057         r = register_netdev(netdev);
1058         if (r) {
1059                 dev_dbg_f(&intf->dev,
1060                          "couldn't register netdev. Error number %d\n", r);
1061                 goto error;
1062         }
1063
1064         dev_dbg_f(&intf->dev, "successful\n");
1065         dev_info(&intf->dev,"%s\n", netdev->name);
1066         return 0;
1067 error:
1068         usb_reset_device(interface_to_usbdev(intf));
1069         zd_netdev_free(netdev);
1070         return r;
1071 }
1072
1073 static void disconnect(struct usb_interface *intf)
1074 {
1075         struct net_device *netdev = zd_intf_to_netdev(intf);
1076         struct zd_mac *mac = zd_netdev_mac(netdev);
1077         struct zd_usb *usb = &mac->chip.usb;
1078
1079         /* Either something really bad happened, or we're just dealing with
1080          * a DEVICE_INSTALLER. */
1081         if (netdev == NULL)
1082                 return;
1083
1084         dev_dbg_f(zd_usb_dev(usb), "\n");
1085
1086         zd_netdev_disconnect(netdev);
1087
1088         /* Just in case something has gone wrong! */
1089         zd_usb_disable_rx(usb);
1090         zd_usb_disable_int(usb);
1091
1092         /* If the disconnect has been caused by a removal of the
1093          * driver module, the reset allows reloading of the driver. If the
1094          * reset will not be executed here, the upload of the firmware in the
1095          * probe function caused by the reloading of the driver will fail.
1096          */
1097         usb_reset_device(interface_to_usbdev(intf));
1098
1099         zd_netdev_free(netdev);
1100         dev_dbg(&intf->dev, "disconnected\n");
1101 }
1102
1103 static struct usb_driver driver = {
1104         .name           = "zd1211rw",
1105         .id_table       = usb_ids,
1106         .probe          = probe,
1107         .disconnect     = disconnect,
1108 };
1109
1110 struct workqueue_struct *zd_workqueue;
1111
1112 static int __init usb_init(void)
1113 {
1114         int r;
1115
1116         pr_debug("usb_init()\n");
1117
1118         zd_workqueue = create_singlethread_workqueue(driver.name);
1119         if (zd_workqueue == NULL) {
1120                 printk(KERN_ERR "%s: couldn't create workqueue\n", driver.name);
1121                 return -ENOMEM;
1122         }
1123
1124         r = usb_register(&driver);
1125         if (r) {
1126                 printk(KERN_ERR "usb_register() failed. Error number %d\n", r);
1127                 return r;
1128         }
1129
1130         pr_debug("zd1211rw initialized\n");
1131         return 0;
1132 }
1133
1134 static void __exit usb_exit(void)
1135 {
1136         pr_debug("usb_exit()\n");
1137         usb_deregister(&driver);
1138         destroy_workqueue(zd_workqueue);
1139 }
1140
1141 module_init(usb_init);
1142 module_exit(usb_exit);
1143
1144 static int usb_int_regs_length(unsigned int count)
1145 {
1146         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1147 }
1148
1149 static void prepare_read_regs_int(struct zd_usb *usb)
1150 {
1151         struct zd_usb_interrupt *intr = &usb->intr;
1152
1153         spin_lock_irq(&intr->lock);
1154         intr->read_regs_enabled = 1;
1155         INIT_COMPLETION(intr->read_regs.completion);
1156         spin_unlock_irq(&intr->lock);
1157 }
1158
1159 static void disable_read_regs_int(struct zd_usb *usb)
1160 {
1161         struct zd_usb_interrupt *intr = &usb->intr;
1162
1163         spin_lock_irq(&intr->lock);
1164         intr->read_regs_enabled = 0;
1165         spin_unlock_irq(&intr->lock);
1166 }
1167
1168 static int get_results(struct zd_usb *usb, u16 *values,
1169                        struct usb_req_read_regs *req, unsigned int count)
1170 {
1171         int r;
1172         int i;
1173         struct zd_usb_interrupt *intr = &usb->intr;
1174         struct read_regs_int *rr = &intr->read_regs;
1175         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1176
1177         spin_lock_irq(&intr->lock);
1178
1179         r = -EIO;
1180         /* The created block size seems to be larger than expected.
1181          * However results appear to be correct.
1182          */
1183         if (rr->length < usb_int_regs_length(count)) {
1184                 dev_dbg_f(zd_usb_dev(usb),
1185                          "error: actual length %d less than expected %d\n",
1186                          rr->length, usb_int_regs_length(count));
1187                 goto error_unlock;
1188         }
1189         if (rr->length > sizeof(rr->buffer)) {
1190                 dev_dbg_f(zd_usb_dev(usb),
1191                          "error: actual length %d exceeds buffer size %zu\n",
1192                          rr->length, sizeof(rr->buffer));
1193                 goto error_unlock;
1194         }
1195
1196         for (i = 0; i < count; i++) {
1197                 struct reg_data *rd = &regs->regs[i];
1198                 if (rd->addr != req->addr[i]) {
1199                         dev_dbg_f(zd_usb_dev(usb),
1200                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1201                                  le16_to_cpu(rd->addr),
1202                                  le16_to_cpu(req->addr[i]));
1203                         goto error_unlock;
1204                 }
1205                 values[i] = le16_to_cpu(rd->value);
1206         }
1207
1208         r = 0;
1209 error_unlock:
1210         spin_unlock_irq(&intr->lock);
1211         return r;
1212 }
1213
1214 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1215                      const zd_addr_t *addresses, unsigned int count)
1216 {
1217         int r;
1218         int i, req_len, actual_req_len;
1219         struct usb_device *udev;
1220         struct usb_req_read_regs *req = NULL;
1221         unsigned long timeout;
1222
1223         if (count < 1) {
1224                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1225                 return -EINVAL;
1226         }
1227         if (count > USB_MAX_IOREAD16_COUNT) {
1228                 dev_dbg_f(zd_usb_dev(usb),
1229                          "error: count %u exceeds possible max %u\n",
1230                          count, USB_MAX_IOREAD16_COUNT);
1231                 return -EINVAL;
1232         }
1233         if (in_atomic()) {
1234                 dev_dbg_f(zd_usb_dev(usb),
1235                          "error: io in atomic context not supported\n");
1236                 return -EWOULDBLOCK;
1237         }
1238         if (!usb_int_enabled(usb)) {
1239                  dev_dbg_f(zd_usb_dev(usb),
1240                           "error: usb interrupt not enabled\n");
1241                 return -EWOULDBLOCK;
1242         }
1243
1244         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1245         req = kmalloc(req_len, GFP_NOFS);
1246         if (!req)
1247                 return -ENOMEM;
1248         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1249         for (i = 0; i < count; i++)
1250                 req->addr[i] = cpu_to_le16(usb_addr(usb, addresses[i]));
1251
1252         udev = zd_usb_to_usbdev(usb);
1253         prepare_read_regs_int(usb);
1254         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1255                          req, req_len, &actual_req_len, 1000 /* ms */);
1256         if (r) {
1257                 dev_dbg_f(zd_usb_dev(usb),
1258                         "error in usb_bulk_msg(). Error number %d\n", r);
1259                 goto error;
1260         }
1261         if (req_len != actual_req_len) {
1262                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1263                         " req_len %d != actual_req_len %d\n",
1264                         req_len, actual_req_len);
1265                 r = -EIO;
1266                 goto error;
1267         }
1268
1269         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1270                                               msecs_to_jiffies(1000));
1271         if (!timeout) {
1272                 disable_read_regs_int(usb);
1273                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1274                 r = -ETIMEDOUT;
1275                 goto error;
1276         }
1277
1278         r = get_results(usb, values, req, count);
1279 error:
1280         kfree(req);
1281         return r;
1282 }
1283
1284 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1285                       unsigned int count)
1286 {
1287         int r;
1288         struct usb_device *udev;
1289         struct usb_req_write_regs *req = NULL;
1290         int i, req_len, actual_req_len;
1291
1292         if (count == 0)
1293                 return 0;
1294         if (count > USB_MAX_IOWRITE16_COUNT) {
1295                 dev_dbg_f(zd_usb_dev(usb),
1296                         "error: count %u exceeds possible max %u\n",
1297                         count, USB_MAX_IOWRITE16_COUNT);
1298                 return -EINVAL;
1299         }
1300         if (in_atomic()) {
1301                 dev_dbg_f(zd_usb_dev(usb),
1302                         "error: io in atomic context not supported\n");
1303                 return -EWOULDBLOCK;
1304         }
1305
1306         req_len = sizeof(struct usb_req_write_regs) +
1307                   count * sizeof(struct reg_data);
1308         req = kmalloc(req_len, GFP_NOFS);
1309         if (!req)
1310                 return -ENOMEM;
1311
1312         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1313         for (i = 0; i < count; i++) {
1314                 struct reg_data *rw  = &req->reg_writes[i];
1315                 rw->addr = cpu_to_le16(usb_addr(usb, ioreqs[i].addr));
1316                 rw->value = cpu_to_le16(ioreqs[i].value);
1317         }
1318
1319         udev = zd_usb_to_usbdev(usb);
1320         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1321                          req, req_len, &actual_req_len, 1000 /* ms */);
1322         if (r) {
1323                 dev_dbg_f(zd_usb_dev(usb),
1324                         "error in usb_bulk_msg(). Error number %d\n", r);
1325                 goto error;
1326         }
1327         if (req_len != actual_req_len) {
1328                 dev_dbg_f(zd_usb_dev(usb),
1329                         "error in usb_bulk_msg()"
1330                         " req_len %d != actual_req_len %d\n",
1331                         req_len, actual_req_len);
1332                 r = -EIO;
1333                 goto error;
1334         }
1335
1336         /* FALL-THROUGH with r == 0 */
1337 error:
1338         kfree(req);
1339         return r;
1340 }
1341
1342 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1343 {
1344         int r;
1345         struct usb_device *udev;
1346         struct usb_req_rfwrite *req = NULL;
1347         int i, req_len, actual_req_len;
1348         u16 bit_value_template;
1349
1350         if (in_atomic()) {
1351                 dev_dbg_f(zd_usb_dev(usb),
1352                         "error: io in atomic context not supported\n");
1353                 return -EWOULDBLOCK;
1354         }
1355         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1356                 dev_dbg_f(zd_usb_dev(usb),
1357                         "error: bits %d are smaller than"
1358                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1359                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1360                 return -EINVAL;
1361         }
1362         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1363                 dev_dbg_f(zd_usb_dev(usb),
1364                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1365                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1366                 return -EINVAL;
1367         }
1368 #ifdef DEBUG
1369         if (value & (~0UL << bits)) {
1370                 dev_dbg_f(zd_usb_dev(usb),
1371                         "error: value %#09x has bits >= %d set\n",
1372                         value, bits);
1373                 return -EINVAL;
1374         }
1375 #endif /* DEBUG */
1376
1377         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1378
1379         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1380         if (r) {
1381                 dev_dbg_f(zd_usb_dev(usb),
1382                         "error %d: Couldn't read CR203\n", r);
1383                 goto out;
1384         }
1385         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1386
1387         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1388         req = kmalloc(req_len, GFP_NOFS);
1389         if (!req)
1390                 return -ENOMEM;
1391
1392         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1393         /* 1: 3683a, but not used in ZYDAS driver */
1394         req->value = cpu_to_le16(2);
1395         req->bits = cpu_to_le16(bits);
1396
1397         for (i = 0; i < bits; i++) {
1398                 u16 bv = bit_value_template;
1399                 if (value & (1 << (bits-1-i)))
1400                         bv |= RF_DATA;
1401                 req->bit_values[i] = cpu_to_le16(bv);
1402         }
1403
1404         udev = zd_usb_to_usbdev(usb);
1405         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1406                          req, req_len, &actual_req_len, 1000 /* ms */);
1407         if (r) {
1408                 dev_dbg_f(zd_usb_dev(usb),
1409                         "error in usb_bulk_msg(). Error number %d\n", r);
1410                 goto out;
1411         }
1412         if (req_len != actual_req_len) {
1413                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1414                         " req_len %d != actual_req_len %d\n",
1415                         req_len, actual_req_len);
1416                 r = -EIO;
1417                 goto out;
1418         }
1419
1420         /* FALL-THROUGH with r == 0 */
1421 out:
1422         kfree(req);
1423         return r;
1424 }