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         { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
  54         { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
  55         /* ZD1211B */
  56         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  57         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  58         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  59         { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
  60         { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
  61         /* "Driverless" devices that need ejecting */
  62         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
  63         {}
  64 };
  65
  66 MODULE_LICENSE("GPL");
  67 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
  68 MODULE_AUTHOR("Ulrich Kunitz");
  69 MODULE_AUTHOR("Daniel Drake");
  70 MODULE_VERSION("1.0");
  71 MODULE_DEVICE_TABLE(usb, usb_ids);
  72
  73 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
  74 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
  75
  76 /* register address handling */
  77
  78 #ifdef DEBUG
  79 static int check_addr(struct zd_usb *usb, zd_addr_t addr)
  80 {
  81         u32 base = ZD_ADDR_BASE(addr);
  82         u32 offset = ZD_OFFSET(addr);
  83
  84         if ((u32)addr & ADDR_ZERO_MASK)
  85                 goto invalid_address;
  86         switch (base) {
  87         case USB_BASE:
  88                 break;
  89         case CR_BASE:
  90                 if (offset > CR_MAX_OFFSET) {
  91                         dev_dbg(zd_usb_dev(usb),
  92                                 "CR offset %#010x larger than"
  93                                 " CR_MAX_OFFSET %#10x\n",
  94                                 offset, CR_MAX_OFFSET);
  95                         goto invalid_address;
  96                 }
  97                 if (offset & 1) {
  98                         dev_dbg(zd_usb_dev(usb),
  99                                 "CR offset %#010x is not a multiple of 2\n",
 100                                 offset);
 101                         goto invalid_address;
 102                 }
 103                 break;
 104         case E2P_BASE:
 105                 if (offset > E2P_MAX_OFFSET) {
 106                         dev_dbg(zd_usb_dev(usb),
 107                                 "E2P offset %#010x larger than"
 108                                 " E2P_MAX_OFFSET %#010x\n",
 109                                 offset, E2P_MAX_OFFSET);
 110                         goto invalid_address;
 111                 }
 112                 break;
 113         case FW_BASE:
 114                 if (!usb->fw_base_offset) {
 115                         dev_dbg(zd_usb_dev(usb),
 116                                "ERROR: fw base offset has not been set\n");
 117                         return -EAGAIN;
 118                 }
 119                 if (offset > FW_MAX_OFFSET) {
 120                         dev_dbg(zd_usb_dev(usb),
 121                                 "FW offset %#10x is larger than"
 122                                 " FW_MAX_OFFSET %#010x\n",
 123                                 offset, FW_MAX_OFFSET);
 124                         goto invalid_address;
 125                 }
 126                 break;
 127         default:
 128                 dev_dbg(zd_usb_dev(usb),
 129                         "address has unsupported base %#010x\n", addr);
 130                 goto invalid_address;
 131         }
 132
 133         return 0;
 134 invalid_address:
 135         dev_dbg(zd_usb_dev(usb),
 136                 "ERROR: invalid address: %#010x\n", addr);
 137         return -EINVAL;
 138 }
 139 #endif /* DEBUG */
 140
 141 static u16 usb_addr(struct zd_usb *usb, zd_addr_t addr)
 142 {
 143         u32 base;
 144         u16 offset;
 145
 146         base = ZD_ADDR_BASE(addr);
 147         offset = ZD_OFFSET(addr);
 148
 149         ZD_ASSERT(check_addr(usb, addr) == 0);
 150
 151         switch (base) {
 152         case CR_BASE:
 153                 offset += CR_BASE_OFFSET;
 154                 break;
 155         case E2P_BASE:
 156                 offset += E2P_BASE_OFFSET;
 157                 break;
 158         case FW_BASE:
 159                 offset += usb->fw_base_offset;
 160                 break;
 161         }
 162
 163         return offset;
 164 }
 165
 166 /* USB device initialization */
 167
 168 static int request_fw_file(
 169         const struct firmware **fw, const char *name, struct device *device)
 170 {
 171         int r;
 172
 173         dev_dbg_f(device, "fw name %s\n", name);
 174
 175         r = request_firmware(fw, name, device);
 176         if (r)
 177                 dev_err(device,
 178                        "Could not load firmware file %s. Error number %d\n",
 179                        name, r);
 180         return r;
 181 }
 182
 183 static inline u16 get_bcdDevice(const struct usb_device *udev)
 184 {
 185         return le16_to_cpu(udev->descriptor.bcdDevice);
 186 }
 187
 188 enum upload_code_flags {
 189         REBOOT = 1,
 190 };
 191
 192 /* Ensures that MAX_TRANSFER_SIZE is even. */
 193 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 194
 195 static int upload_code(struct usb_device *udev,
 196         const u8 *data, size_t size, u16 code_offset, int flags)
 197 {
 198         u8 *p;
 199         int r;
 200
 201         /* USB request blocks need "kmalloced" buffers.
 202          */
 203         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 204         if (!p) {
 205                 dev_err(&udev->dev, "out of memory\n");
 206                 r = -ENOMEM;
 207                 goto error;
 208         }
 209
 210         size &= ~1;
 211         while (size > 0) {
 212                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 213                         size : MAX_TRANSFER_SIZE;
 214
 215                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 216
 217                 memcpy(p, data, transfer_size);
 218                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 219                         USB_REQ_FIRMWARE_DOWNLOAD,
 220                         USB_DIR_OUT | USB_TYPE_VENDOR,
 221                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 222                 if (r < 0) {
 223                         dev_err(&udev->dev,
 224                                "USB control request for firmware upload"
 225                                " failed. Error number %d\n", r);
 226                         goto error;
 227                 }
 228                 transfer_size = r & ~1;
 229
 230                 size -= transfer_size;
 231                 data += transfer_size;
 232                 code_offset += transfer_size/sizeof(u16);
 233         }
 234
 235         if (flags & REBOOT) {
 236                 u8 ret;
 237
 238                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 239                         USB_REQ_FIRMWARE_CONFIRM,
 240                         USB_DIR_IN | USB_TYPE_VENDOR,
 241                         0, 0, &ret, sizeof(ret), 5000 /* ms */);
 242                 if (r != sizeof(ret)) {
 243                         dev_err(&udev->dev,
 244                                 "control request firmeware confirmation failed."
 245                                 " Return value %d\n", r);
 246                         if (r >= 0)
 247                                 r = -ENODEV;
 248                         goto error;
 249                 }
 250                 if (ret & 0x80) {
 251                         dev_err(&udev->dev,
 252                                 "Internal error while downloading."
 253                                 " Firmware confirm return value %#04x\n",
 254                                 (unsigned int)ret);
 255                         r = -ENODEV;
 256                         goto error;
 257                 }
 258                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 259                         (unsigned int)ret);
 260         }
 261
 262         r = 0;
 263 error:
 264         kfree(p);
 265         return r;
 266 }
 267
 268 static u16 get_word(const void *data, u16 offset)
 269 {
 270         const __le16 *p = data;
 271         return le16_to_cpu(p[offset]);
 272 }
 273
 274 static char *get_fw_name(char *buffer, size_t size, u8 device_type,
 275                        const char* postfix)
 276 {
 277         scnprintf(buffer, size, "%s%s",
 278                 device_type == DEVICE_ZD1211B ?
 279                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 280                 postfix);
 281         return buffer;
 282 }
 283
 284 static int handle_version_mismatch(struct usb_device *udev, u8 device_type,
 285         const struct firmware *ub_fw)
 286 {
 287         const struct firmware *ur_fw = NULL;
 288         int offset;
 289         int r = 0;
 290         char fw_name[128];
 291
 292         r = request_fw_file(&ur_fw,
 293                 get_fw_name(fw_name, sizeof(fw_name), device_type, "ur"),
 294                 &udev->dev);
 295         if (r)
 296                 goto error;
 297
 298         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START_OFFSET,
 299                 REBOOT);
 300         if (r)
 301                 goto error;
 302
 303         offset = ((EEPROM_REGS_OFFSET + EEPROM_REGS_SIZE) * sizeof(u16));
 304         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
 305                 E2P_BASE_OFFSET + EEPROM_REGS_SIZE, REBOOT);
 306
 307         /* At this point, the vendor driver downloads the whole firmware
 308          * image, hacks around with version IDs, and uploads it again,
 309          * completely overwriting the boot code. We do not do this here as
 310          * it is not required on any tested devices, and it is suspected to
 311          * cause problems. */
 312 error:
 313         release_firmware(ur_fw);
 314         return r;
 315 }
 316
 317 static int upload_firmware(struct usb_device *udev, u8 device_type)
 318 {
 319         int r;
 320         u16 fw_bcdDevice;
 321         u16 bcdDevice;
 322         const struct firmware *ub_fw = NULL;
 323         const struct firmware *uph_fw = NULL;
 324         char fw_name[128];
 325
 326         bcdDevice = get_bcdDevice(udev);
 327
 328         r = request_fw_file(&ub_fw,
 329                 get_fw_name(fw_name, sizeof(fw_name), device_type,  "ub"),
 330                 &udev->dev);
 331         if (r)
 332                 goto error;
 333
 334         fw_bcdDevice = get_word(ub_fw->data, EEPROM_REGS_OFFSET);
 335
 336         if (fw_bcdDevice != bcdDevice) {
 337                 dev_info(&udev->dev,
 338                         "firmware version %#06x and device bootcode version "
 339                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
 340                 if (bcdDevice <= 0x4313)
 341                         dev_warn(&udev->dev, "device has old bootcode, please "
 342                                 "report success or failure\n");
 343
 344                 r = handle_version_mismatch(udev, device_type, ub_fw);
 345                 if (r)
 346                         goto error;
 347         } else {
 348                 dev_dbg_f(&udev->dev,
 349                         "firmware device id %#06x is equal to the "
 350                         "actual device id\n", fw_bcdDevice);
 351         }
 352
 353
 354         r = request_fw_file(&uph_fw,
 355                 get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"),
 356                 &udev->dev);
 357         if (r)
 358                 goto error;
 359
 360         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START_OFFSET,
 361                         REBOOT);
 362         if (r) {
 363                 dev_err(&udev->dev,
 364                         "Could not upload firmware code uph. Error number %d\n",
 365                         r);
 366         }
 367
 368         /* FALL-THROUGH */
 369 error:
 370         release_firmware(ub_fw);
 371         release_firmware(uph_fw);
 372         return r;
 373 }
 374
 375 #define urb_dev(urb) (&(urb)->dev->dev)
 376
 377 static inline void handle_regs_int(struct urb *urb)
 378 {
 379         struct zd_usb *usb = urb->context;
 380         struct zd_usb_interrupt *intr = &usb->intr;
 381         int len;
 382
 383         ZD_ASSERT(in_interrupt());
 384         spin_lock(&intr->lock);
 385
 386         if (intr->read_regs_enabled) {
 387                 intr->read_regs.length = len = urb->actual_length;
 388
 389                 if (len > sizeof(intr->read_regs.buffer))
 390                         len = sizeof(intr->read_regs.buffer);
 391                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 392                 intr->read_regs_enabled = 0;
 393                 complete(&intr->read_regs.completion);
 394                 goto out;
 395         }
 396
 397         dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
 398 out:
 399         spin_unlock(&intr->lock);
 400 }
 401
 402 static inline void handle_retry_failed_int(struct urb *urb)
 403 {
 404         struct zd_usb *usb = urb->context;
 405         struct zd_mac *mac = zd_usb_to_mac(usb);
 406         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 407
 408         ieee->stats.tx_errors++;
 409         ieee->ieee_stats.tx_retry_limit_exceeded++;
 410         dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
 411 }
 412
 413
 414 static void int_urb_complete(struct urb *urb)
 415 {
 416         int r;
 417         struct usb_int_header *hdr;
 418
 419         switch (urb->status) {
 420         case 0:
 421                 break;
 422         case -ESHUTDOWN:
 423         case -EINVAL:
 424         case -ENODEV:
 425         case -ENOENT:
 426         case -ECONNRESET:
 427         case -EPIPE:
 428                 goto kfree;
 429         default:
 430                 goto resubmit;
 431         }
 432
 433         if (urb->actual_length < sizeof(hdr)) {
 434                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 435                 goto resubmit;
 436         }
 437
 438         hdr = urb->transfer_buffer;
 439         if (hdr->type != USB_INT_TYPE) {
 440                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 441                 goto resubmit;
 442         }
 443
 444         switch (hdr->id) {
 445         case USB_INT_ID_REGS:
 446                 handle_regs_int(urb);
 447                 break;
 448         case USB_INT_ID_RETRY_FAILED:
 449                 handle_retry_failed_int(urb);
 450                 break;
 451         default:
 452                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 453                         (unsigned int)hdr->id);
 454                 goto resubmit;
 455         }
 456
 457 resubmit:
 458         r = usb_submit_urb(urb, GFP_ATOMIC);
 459         if (r) {
 460                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
 461                 goto kfree;
 462         }
 463         return;
 464 kfree:
 465         kfree(urb->transfer_buffer);
 466 }
 467
 468 static inline int int_urb_interval(struct usb_device *udev)
 469 {
 470         switch (udev->speed) {
 471         case USB_SPEED_HIGH:
 472                 return 4;
 473         case USB_SPEED_LOW:
 474                 return 10;
 475         case USB_SPEED_FULL:
 476         default:
 477                 return 1;
 478         }
 479 }
 480
 481 static inline int usb_int_enabled(struct zd_usb *usb)
 482 {
 483         unsigned long flags;
 484         struct zd_usb_interrupt *intr = &usb->intr;
 485         struct urb *urb;
 486
 487         spin_lock_irqsave(&intr->lock, flags);
 488         urb = intr->urb;
 489         spin_unlock_irqrestore(&intr->lock, flags);
 490         return urb != NULL;
 491 }
 492
 493 int zd_usb_enable_int(struct zd_usb *usb)
 494 {
 495         int r;
 496         struct usb_device *udev;
 497         struct zd_usb_interrupt *intr = &usb->intr;
 498         void *transfer_buffer = NULL;
 499         struct urb *urb;
 500
 501         dev_dbg_f(zd_usb_dev(usb), "\n");
 502
 503         urb = usb_alloc_urb(0, GFP_NOFS);
 504         if (!urb) {
 505                 r = -ENOMEM;
 506                 goto out;
 507         }
 508
 509         ZD_ASSERT(!irqs_disabled());
 510         spin_lock_irq(&intr->lock);
 511         if (intr->urb) {
 512                 spin_unlock_irq(&intr->lock);
 513                 r = 0;
 514                 goto error_free_urb;
 515         }
 516         intr->urb = urb;
 517         spin_unlock_irq(&intr->lock);
 518
 519         /* TODO: make it a DMA buffer */
 520         r = -ENOMEM;
 521         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_NOFS);
 522         if (!transfer_buffer) {
 523                 dev_dbg_f(zd_usb_dev(usb),
 524                         "couldn't allocate transfer_buffer\n");
 525                 goto error_set_urb_null;
 526         }
 527
 528         udev = zd_usb_to_usbdev(usb);
 529         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 530                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
 531                          int_urb_complete, usb,
 532                          intr->interval);
 533
 534         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 535         r = usb_submit_urb(urb, GFP_NOFS);
 536         if (r) {
 537                 dev_dbg_f(zd_usb_dev(usb),
 538                          "Couldn't submit urb. Error number %d\n", r);
 539                 goto error;
 540         }
 541
 542         return 0;
 543 error:
 544         kfree(transfer_buffer);
 545 error_set_urb_null:
 546         spin_lock_irq(&intr->lock);
 547         intr->urb = NULL;
 548         spin_unlock_irq(&intr->lock);
 549 error_free_urb:
 550         usb_free_urb(urb);
 551 out:
 552         return r;
 553 }
 554
 555 void zd_usb_disable_int(struct zd_usb *usb)
 556 {
 557         unsigned long flags;
 558         struct zd_usb_interrupt *intr = &usb->intr;
 559         struct urb *urb;
 560
 561         spin_lock_irqsave(&intr->lock, flags);
 562         urb = intr->urb;
 563         if (!urb) {
 564                 spin_unlock_irqrestore(&intr->lock, flags);
 565                 return;
 566         }
 567         intr->urb = NULL;
 568         spin_unlock_irqrestore(&intr->lock, flags);
 569
 570         usb_kill_urb(urb);
 571         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 572         usb_free_urb(urb);
 573 }
 574
 575 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 576                              unsigned int length)
 577 {
 578         int i;
 579         struct zd_mac *mac = zd_usb_to_mac(usb);
 580         const struct rx_length_info *length_info;
 581
 582         if (length < sizeof(struct rx_length_info)) {
 583                 /* It's not a complete packet anyhow. */
 584                 struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 585                 ieee->stats.rx_errors++;
 586                 ieee->stats.rx_length_errors++;
 587                 return;
 588         }
 589         length_info = (struct rx_length_info *)
 590                 (buffer + length - sizeof(struct rx_length_info));
 591
 592         /* It might be that three frames are merged into a single URB
 593          * transaction. We have to check for the length info tag.
 594          *
 595          * While testing we discovered that length_info might be unaligned,
 596          * because if USB transactions are merged, the last packet will not
 597          * be padded. Unaligned access might also happen if the length_info
 598          * structure is not present.
 599          */
 600         if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
 601         {
 602                 unsigned int l, k, n;
 603                 for (i = 0, l = 0;; i++) {
 604                         k = le16_to_cpu(get_unaligned(&length_info->length[i]));
 605                         if (k == 0)
 606                                 return;
 607                         n = l+k;
 608                         if (n > length)
 609                                 return;
 610                         zd_mac_rx_irq(mac, buffer+l, k);
 611                         if (i >= 2)
 612                                 return;
 613                         l = (n+3) & ~3;
 614                 }
 615         } else {
 616                 zd_mac_rx_irq(mac, buffer, length);
 617         }
 618 }
 619
 620 static void rx_urb_complete(struct urb *urb)
 621 {
 622         struct zd_usb *usb;
 623         struct zd_usb_rx *rx;
 624         const u8 *buffer;
 625         unsigned int length;
 626
 627         switch (urb->status) {
 628         case 0:
 629                 break;
 630         case -ESHUTDOWN:
 631         case -EINVAL:
 632         case -ENODEV:
 633         case -ENOENT:
 634         case -ECONNRESET:
 635         case -EPIPE:
 636                 return;
 637         default:
 638                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 639                 goto resubmit;
 640         }
 641
 642         buffer = urb->transfer_buffer;
 643         length = urb->actual_length;
 644         usb = urb->context;
 645         rx = &usb->rx;
 646
 647         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 648                 /* If there is an old first fragment, we don't care. */
 649                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 650                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 651                 spin_lock(&rx->lock);
 652                 memcpy(rx->fragment, buffer, length);
 653                 rx->fragment_length = length;
 654                 spin_unlock(&rx->lock);
 655                 goto resubmit;
 656         }
 657
 658         spin_lock(&rx->lock);
 659         if (rx->fragment_length > 0) {
 660                 /* We are on a second fragment, we believe */
 661                 ZD_ASSERT(length + rx->fragment_length <=
 662                           ARRAY_SIZE(rx->fragment));
 663                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 664                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 665                 handle_rx_packet(usb, rx->fragment,
 666                                  rx->fragment_length + length);
 667                 rx->fragment_length = 0;
 668                 spin_unlock(&rx->lock);
 669         } else {
 670                 spin_unlock(&rx->lock);
 671                 handle_rx_packet(usb, buffer, length);
 672         }
 673
 674 resubmit:
 675         usb_submit_urb(urb, GFP_ATOMIC);
 676 }
 677
 678 static struct urb *alloc_urb(struct zd_usb *usb)
 679 {
 680         struct usb_device *udev = zd_usb_to_usbdev(usb);
 681         struct urb *urb;
 682         void *buffer;
 683
 684         urb = usb_alloc_urb(0, GFP_NOFS);
 685         if (!urb)
 686                 return NULL;
 687         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_NOFS,
 688                                   &urb->transfer_dma);
 689         if (!buffer) {
 690                 usb_free_urb(urb);
 691                 return NULL;
 692         }
 693
 694         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 695                           buffer, USB_MAX_RX_SIZE,
 696                           rx_urb_complete, usb);
 697         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 698
 699         return urb;
 700 }
 701
 702 static void free_urb(struct urb *urb)
 703 {
 704         if (!urb)
 705                 return;
 706         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 707                         urb->transfer_buffer, urb->transfer_dma);
 708         usb_free_urb(urb);
 709 }
 710
 711 int zd_usb_enable_rx(struct zd_usb *usb)
 712 {
 713         int i, r;
 714         struct zd_usb_rx *rx = &usb->rx;
 715         struct urb **urbs;
 716
 717         dev_dbg_f(zd_usb_dev(usb), "\n");
 718
 719         r = -ENOMEM;
 720         urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_NOFS);
 721         if (!urbs)
 722                 goto error;
 723         for (i = 0; i < URBS_COUNT; i++) {
 724                 urbs[i] = alloc_urb(usb);
 725                 if (!urbs[i])
 726                         goto error;
 727         }
 728
 729         ZD_ASSERT(!irqs_disabled());
 730         spin_lock_irq(&rx->lock);
 731         if (rx->urbs) {
 732                 spin_unlock_irq(&rx->lock);
 733                 r = 0;
 734                 goto error;
 735         }
 736         rx->urbs = urbs;
 737         rx->urbs_count = URBS_COUNT;
 738         spin_unlock_irq(&rx->lock);
 739
 740         for (i = 0; i < URBS_COUNT; i++) {
 741                 r = usb_submit_urb(urbs[i], GFP_NOFS);
 742                 if (r)
 743                         goto error_submit;
 744         }
 745
 746         return 0;
 747 error_submit:
 748         for (i = 0; i < URBS_COUNT; i++) {
 749                 usb_kill_urb(urbs[i]);
 750         }
 751         spin_lock_irq(&rx->lock);
 752         rx->urbs = NULL;
 753         rx->urbs_count = 0;
 754         spin_unlock_irq(&rx->lock);
 755 error:
 756         if (urbs) {
 757                 for (i = 0; i < URBS_COUNT; i++)
 758                         free_urb(urbs[i]);
 759         }
 760         return r;
 761 }
 762
 763 void zd_usb_disable_rx(struct zd_usb *usb)
 764 {
 765         int i;
 766         unsigned long flags;
 767         struct urb **urbs;
 768         unsigned int count;
 769         struct zd_usb_rx *rx = &usb->rx;
 770
 771         spin_lock_irqsave(&rx->lock, flags);
 772         urbs = rx->urbs;
 773         count = rx->urbs_count;
 774         spin_unlock_irqrestore(&rx->lock, flags);
 775         if (!urbs)
 776                 return;
 777
 778         for (i = 0; i < count; i++) {
 779                 usb_kill_urb(urbs[i]);
 780                 free_urb(urbs[i]);
 781         }
 782         kfree(urbs);
 783
 784         spin_lock_irqsave(&rx->lock, flags);
 785         rx->urbs = NULL;
 786         rx->urbs_count = 0;
 787         spin_unlock_irqrestore(&rx->lock, flags);
 788 }
 789
 790 static void tx_urb_complete(struct urb *urb)
 791 {
 792         int r;
 793
 794         switch (urb->status) {
 795         case 0:
 796                 break;
 797         case -ESHUTDOWN:
 798         case -EINVAL:
 799         case -ENODEV:
 800         case -ENOENT:
 801         case -ECONNRESET:
 802         case -EPIPE:
 803                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 804                 break;
 805         default:
 806                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 807                 goto resubmit;
 808         }
 809 free_urb:
 810         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 811                         urb->transfer_buffer, urb->transfer_dma);
 812         usb_free_urb(urb);
 813         return;
 814 resubmit:
 815         r = usb_submit_urb(urb, GFP_ATOMIC);
 816         if (r) {
 817                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 818                 goto free_urb;
 819         }
 820 }
 821
 822 /* Puts the frame on the USB endpoint. It doesn't wait for
 823  * completion. The frame must contain the control set.
 824  */
 825 int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
 826 {
 827         int r;
 828         struct usb_device *udev = zd_usb_to_usbdev(usb);
 829         struct urb *urb;
 830         void *buffer;
 831
 832         urb = usb_alloc_urb(0, GFP_ATOMIC);
 833         if (!urb) {
 834                 r = -ENOMEM;
 835                 goto out;
 836         }
 837
 838         buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
 839                                   &urb->transfer_dma);
 840         if (!buffer) {
 841                 r = -ENOMEM;
 842                 goto error_free_urb;
 843         }
 844         memcpy(buffer, frame, length);
 845
 846         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 847                           buffer, length, tx_urb_complete, NULL);
 848         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 849
 850         r = usb_submit_urb(urb, GFP_ATOMIC);
 851         if (r)
 852                 goto error;
 853         return 0;
 854 error:
 855         usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
 856                         urb->transfer_dma);
 857 error_free_urb:
 858         usb_free_urb(urb);
 859 out:
 860         return r;
 861 }
 862
 863 static inline void init_usb_interrupt(struct zd_usb *usb)
 864 {
 865         struct zd_usb_interrupt *intr = &usb->intr;
 866
 867         spin_lock_init(&intr->lock);
 868         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 869         init_completion(&intr->read_regs.completion);
 870         intr->read_regs.cr_int_addr = cpu_to_le16(usb_addr(usb, CR_INTERRUPT));
 871 }
 872
 873 static inline void init_usb_rx(struct zd_usb *usb)
 874 {
 875         struct zd_usb_rx *rx = &usb->rx;
 876         spin_lock_init(&rx->lock);
 877         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 878                 rx->usb_packet_size = 512;
 879         } else {
 880                 rx->usb_packet_size = 64;
 881         }
 882         ZD_ASSERT(rx->fragment_length == 0);
 883 }
 884
 885 static inline void init_usb_tx(struct zd_usb *usb)
 886 {
 887         /* FIXME: at this point we will allocate a fixed number of urb's for
 888          * use in a cyclic scheme */
 889 }
 890
 891 void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
 892                  struct usb_interface *intf)
 893 {
 894         memset(usb, 0, sizeof(*usb));
 895         usb->intf = usb_get_intf(intf);
 896         usb_set_intfdata(usb->intf, netdev);
 897         init_usb_interrupt(usb);
 898         init_usb_tx(usb);
 899         init_usb_rx(usb);
 900 }
 901
 902 int zd_usb_init_hw(struct zd_usb *usb)
 903 {
 904         int r;
 905         struct zd_chip *chip = zd_usb_to_chip(usb);
 906
 907         ZD_ASSERT(mutex_is_locked(&chip->mutex));
 908         r = zd_ioread16_locked(chip, &usb->fw_base_offset,
 909                         USB_REG((u16)FW_BASE_ADDR_OFFSET));
 910         if (r)
 911                 return r;
 912         dev_dbg_f(zd_usb_dev(usb), "fw_base_offset: %#06hx\n",
 913                  usb->fw_base_offset);
 914
 915         return 0;
 916 }
 917
 918 void zd_usb_clear(struct zd_usb *usb)
 919 {
 920         usb_set_intfdata(usb->intf, NULL);
 921         usb_put_intf(usb->intf);
 922         ZD_MEMCLEAR(usb, sizeof(*usb));
 923         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
 924 }
 925
 926 static const char *speed(enum usb_device_speed speed)
 927 {
 928         switch (speed) {
 929         case USB_SPEED_LOW:
 930                 return "low";
 931         case USB_SPEED_FULL:
 932                 return "full";
 933         case USB_SPEED_HIGH:
 934                 return "high";
 935         default:
 936                 return "unknown speed";
 937         }
 938 }
 939
 940 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
 941 {
 942         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
 943                 le16_to_cpu(udev->descriptor.idVendor),
 944                 le16_to_cpu(udev->descriptor.idProduct),
 945                 get_bcdDevice(udev),
 946                 speed(udev->speed));
 947 }
 948
 949 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
 950 {
 951         struct usb_device *udev = interface_to_usbdev(usb->intf);
 952         return scnprint_id(udev, buffer, size);
 953 }
 954
 955 #ifdef DEBUG
 956 static void print_id(struct usb_device *udev)
 957 {
 958         char buffer[40];
 959
 960         scnprint_id(udev, buffer, sizeof(buffer));
 961         buffer[sizeof(buffer)-1] = 0;
 962         dev_dbg_f(&udev->dev, "%s\n", buffer);
 963 }
 964 #else
 965 #define print_id(udev) do { } while (0)
 966 #endif
 967
 968 static int eject_installer(struct usb_interface *intf)
 969 {
 970         struct usb_device *udev = interface_to_usbdev(intf);
 971         struct usb_host_interface *iface_desc = &intf->altsetting[0];
 972         struct usb_endpoint_descriptor *endpoint;
 973         unsigned char *cmd;
 974         u8 bulk_out_ep;
 975         int r;
 976
 977         /* Find bulk out endpoint */
 978         endpoint = &iface_desc->endpoint[1].desc;
 979         if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
 980             (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
 981             USB_ENDPOINT_XFER_BULK) {
 982                 bulk_out_ep = endpoint->bEndpointAddress;
 983         } else {
 984                 dev_err(&udev->dev,
 985                         "zd1211rw: Could not find bulk out endpoint\n");
 986                 return -ENODEV;
 987         }
 988
 989         cmd = kzalloc(31, GFP_KERNEL);
 990         if (cmd == NULL)
 991                 return -ENODEV;
 992
 993         /* USB bulk command block */
 994         cmd[0] = 0x55;  /* bulk command signature */
 995         cmd[1] = 0x53;  /* bulk command signature */
 996         cmd[2] = 0x42;  /* bulk command signature */
 997         cmd[3] = 0x43;  /* bulk command signature */
 998         cmd[14] = 6;    /* command length */
 999
1000         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1001         cmd[19] = 0x2;  /* eject disc */
1002
1003         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1004         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1005                 cmd, 31, NULL, 2000);
1006         kfree(cmd);
1007         if (r)
1008                 return r;
1009
1010         /* At this point, the device disconnects and reconnects with the real
1011          * ID numbers. */
1012
1013         usb_set_intfdata(intf, NULL);
1014         return 0;
1015 }
1016
1017 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1018 {
1019         int r;
1020         struct usb_device *udev = interface_to_usbdev(intf);
1021         struct net_device *netdev = NULL;
1022
1023         print_id(udev);
1024
1025         if (id->driver_info & DEVICE_INSTALLER)
1026                 return eject_installer(intf);
1027
1028         switch (udev->speed) {
1029         case USB_SPEED_LOW:
1030         case USB_SPEED_FULL:
1031         case USB_SPEED_HIGH:
1032                 break;
1033         default:
1034                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1035                 r = -ENODEV;
1036                 goto error;
1037         }
1038
1039         usb_reset_device(interface_to_usbdev(intf));
1040
1041         netdev = zd_netdev_alloc(intf);
1042         if (netdev == NULL) {
1043                 r = -ENOMEM;
1044                 goto error;
1045         }
1046
1047         r = upload_firmware(udev, id->driver_info);
1048         if (r) {
1049                 dev_err(&intf->dev,
1050                        "couldn't load firmware. Error number %d\n", r);
1051                 goto error;
1052         }
1053
1054         r = usb_reset_configuration(udev);
1055         if (r) {
1056                 dev_dbg_f(&intf->dev,
1057                         "couldn't reset configuration. Error number %d\n", r);
1058                 goto error;
1059         }
1060
1061         /* At this point the interrupt endpoint is not generally enabled. We
1062          * save the USB bandwidth until the network device is opened. But
1063          * notify that the initialization of the MAC will require the
1064          * interrupts to be temporary enabled.
1065          */
1066         r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
1067         if (r) {
1068                 dev_dbg_f(&intf->dev,
1069                          "couldn't initialize mac. Error number %d\n", r);
1070                 goto error;
1071         }
1072
1073         r = register_netdev(netdev);
1074         if (r) {
1075                 dev_dbg_f(&intf->dev,
1076                          "couldn't register netdev. Error number %d\n", r);
1077                 goto error;
1078         }
1079
1080         dev_dbg_f(&intf->dev, "successful\n");
1081         dev_info(&intf->dev,"%s\n", netdev->name);
1082         return 0;
1083 error:
1084         usb_reset_device(interface_to_usbdev(intf));
1085         zd_netdev_free(netdev);
1086         return r;
1087 }
1088
1089 static void disconnect(struct usb_interface *intf)
1090 {
1091         struct net_device *netdev = zd_intf_to_netdev(intf);
1092         struct zd_mac *mac = zd_netdev_mac(netdev);
1093         struct zd_usb *usb = &mac->chip.usb;
1094
1095         /* Either something really bad happened, or we're just dealing with
1096          * a DEVICE_INSTALLER. */
1097         if (netdev == NULL)
1098                 return;
1099
1100         dev_dbg_f(zd_usb_dev(usb), "\n");
1101
1102         zd_netdev_disconnect(netdev);
1103
1104         /* Just in case something has gone wrong! */
1105         zd_usb_disable_rx(usb);
1106         zd_usb_disable_int(usb);
1107
1108         /* If the disconnect has been caused by a removal of the
1109          * driver module, the reset allows reloading of the driver. If the
1110          * reset will not be executed here, the upload of the firmware in the
1111          * probe function caused by the reloading of the driver will fail.
1112          */
1113         usb_reset_device(interface_to_usbdev(intf));
1114
1115         zd_netdev_free(netdev);
1116         dev_dbg(&intf->dev, "disconnected\n");
1117 }
1118
1119 static struct usb_driver driver = {
1120         .name           = "zd1211rw",
1121         .id_table       = usb_ids,
1122         .probe          = probe,
1123         .disconnect     = disconnect,
1124 };
1125
1126 struct workqueue_struct *zd_workqueue;
1127
1128 static int __init usb_init(void)
1129 {
1130         int r;
1131
1132         pr_debug("%s usb_init()\n", driver.name);
1133
1134         zd_workqueue = create_singlethread_workqueue(driver.name);
1135         if (zd_workqueue == NULL) {
1136                 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1137                 return -ENOMEM;
1138         }
1139
1140         r = usb_register(&driver);
1141         if (r) {
1142                 destroy_workqueue(zd_workqueue);
1143                 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1144                        driver.name, r);
1145                 return r;
1146         }
1147
1148         pr_debug("%s initialized\n", driver.name);
1149         return 0;
1150 }
1151
1152 static void __exit usb_exit(void)
1153 {
1154         pr_debug("%s usb_exit()\n", driver.name);
1155         usb_deregister(&driver);
1156         destroy_workqueue(zd_workqueue);
1157 }
1158
1159 module_init(usb_init);
1160 module_exit(usb_exit);
1161
1162 static int usb_int_regs_length(unsigned int count)
1163 {
1164         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1165 }
1166
1167 static void prepare_read_regs_int(struct zd_usb *usb)
1168 {
1169         struct zd_usb_interrupt *intr = &usb->intr;
1170
1171         spin_lock_irq(&intr->lock);
1172         intr->read_regs_enabled = 1;
1173         INIT_COMPLETION(intr->read_regs.completion);
1174         spin_unlock_irq(&intr->lock);
1175 }
1176
1177 static void disable_read_regs_int(struct zd_usb *usb)
1178 {
1179         struct zd_usb_interrupt *intr = &usb->intr;
1180
1181         spin_lock_irq(&intr->lock);
1182         intr->read_regs_enabled = 0;
1183         spin_unlock_irq(&intr->lock);
1184 }
1185
1186 static int get_results(struct zd_usb *usb, u16 *values,
1187                        struct usb_req_read_regs *req, unsigned int count)
1188 {
1189         int r;
1190         int i;
1191         struct zd_usb_interrupt *intr = &usb->intr;
1192         struct read_regs_int *rr = &intr->read_regs;
1193         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1194
1195         spin_lock_irq(&intr->lock);
1196
1197         r = -EIO;
1198         /* The created block size seems to be larger than expected.
1199          * However results appear to be correct.
1200          */
1201         if (rr->length < usb_int_regs_length(count)) {
1202                 dev_dbg_f(zd_usb_dev(usb),
1203                          "error: actual length %d less than expected %d\n",
1204                          rr->length, usb_int_regs_length(count));
1205                 goto error_unlock;
1206         }
1207         if (rr->length > sizeof(rr->buffer)) {
1208                 dev_dbg_f(zd_usb_dev(usb),
1209                          "error: actual length %d exceeds buffer size %zu\n",
1210                          rr->length, sizeof(rr->buffer));
1211                 goto error_unlock;
1212         }
1213
1214         for (i = 0; i < count; i++) {
1215                 struct reg_data *rd = &regs->regs[i];
1216                 if (rd->addr != req->addr[i]) {
1217                         dev_dbg_f(zd_usb_dev(usb),
1218                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1219                                  le16_to_cpu(rd->addr),
1220                                  le16_to_cpu(req->addr[i]));
1221                         goto error_unlock;
1222                 }
1223                 values[i] = le16_to_cpu(rd->value);
1224         }
1225
1226         r = 0;
1227 error_unlock:
1228         spin_unlock_irq(&intr->lock);
1229         return r;
1230 }
1231
1232 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1233                      const zd_addr_t *addresses, unsigned int count)
1234 {
1235         int r;
1236         int i, req_len, actual_req_len;
1237         struct usb_device *udev;
1238         struct usb_req_read_regs *req = NULL;
1239         unsigned long timeout;
1240
1241         if (count < 1) {
1242                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1243                 return -EINVAL;
1244         }
1245         if (count > USB_MAX_IOREAD16_COUNT) {
1246                 dev_dbg_f(zd_usb_dev(usb),
1247                          "error: count %u exceeds possible max %u\n",
1248                          count, USB_MAX_IOREAD16_COUNT);
1249                 return -EINVAL;
1250         }
1251         if (in_atomic()) {
1252                 dev_dbg_f(zd_usb_dev(usb),
1253                          "error: io in atomic context not supported\n");
1254                 return -EWOULDBLOCK;
1255         }
1256         if (!usb_int_enabled(usb)) {
1257                  dev_dbg_f(zd_usb_dev(usb),
1258                           "error: usb interrupt not enabled\n");
1259                 return -EWOULDBLOCK;
1260         }
1261
1262         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1263         req = kmalloc(req_len, GFP_NOFS);
1264         if (!req)
1265                 return -ENOMEM;
1266         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1267         for (i = 0; i < count; i++)
1268                 req->addr[i] = cpu_to_le16(usb_addr(usb, addresses[i]));
1269
1270         udev = zd_usb_to_usbdev(usb);
1271         prepare_read_regs_int(usb);
1272         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1273                          req, req_len, &actual_req_len, 1000 /* ms */);
1274         if (r) {
1275                 dev_dbg_f(zd_usb_dev(usb),
1276                         "error in usb_bulk_msg(). Error number %d\n", r);
1277                 goto error;
1278         }
1279         if (req_len != actual_req_len) {
1280                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1281                         " req_len %d != actual_req_len %d\n",
1282                         req_len, actual_req_len);
1283                 r = -EIO;
1284                 goto error;
1285         }
1286
1287         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1288                                               msecs_to_jiffies(1000));
1289         if (!timeout) {
1290                 disable_read_regs_int(usb);
1291                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1292                 r = -ETIMEDOUT;
1293                 goto error;
1294         }
1295
1296         r = get_results(usb, values, req, count);
1297 error:
1298         kfree(req);
1299         return r;
1300 }
1301
1302 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1303                       unsigned int count)
1304 {
1305         int r;
1306         struct usb_device *udev;
1307         struct usb_req_write_regs *req = NULL;
1308         int i, req_len, actual_req_len;
1309
1310         if (count == 0)
1311                 return 0;
1312         if (count > USB_MAX_IOWRITE16_COUNT) {
1313                 dev_dbg_f(zd_usb_dev(usb),
1314                         "error: count %u exceeds possible max %u\n",
1315                         count, USB_MAX_IOWRITE16_COUNT);
1316                 return -EINVAL;
1317         }
1318         if (in_atomic()) {
1319                 dev_dbg_f(zd_usb_dev(usb),
1320                         "error: io in atomic context not supported\n");
1321                 return -EWOULDBLOCK;
1322         }
1323
1324         req_len = sizeof(struct usb_req_write_regs) +
1325                   count * sizeof(struct reg_data);
1326         req = kmalloc(req_len, GFP_NOFS);
1327         if (!req)
1328                 return -ENOMEM;
1329
1330         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1331         for (i = 0; i < count; i++) {
1332                 struct reg_data *rw  = &req->reg_writes[i];
1333                 rw->addr = cpu_to_le16(usb_addr(usb, ioreqs[i].addr));
1334                 rw->value = cpu_to_le16(ioreqs[i].value);
1335         }
1336
1337         udev = zd_usb_to_usbdev(usb);
1338         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1339                          req, req_len, &actual_req_len, 1000 /* ms */);
1340         if (r) {
1341                 dev_dbg_f(zd_usb_dev(usb),
1342                         "error in usb_bulk_msg(). Error number %d\n", r);
1343                 goto error;
1344         }
1345         if (req_len != actual_req_len) {
1346                 dev_dbg_f(zd_usb_dev(usb),
1347                         "error in usb_bulk_msg()"
1348                         " req_len %d != actual_req_len %d\n",
1349                         req_len, actual_req_len);
1350                 r = -EIO;
1351                 goto error;
1352         }
1353
1354         /* FALL-THROUGH with r == 0 */
1355 error:
1356         kfree(req);
1357         return r;
1358 }
1359
1360 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1361 {
1362         int r;
1363         struct usb_device *udev;
1364         struct usb_req_rfwrite *req = NULL;
1365         int i, req_len, actual_req_len;
1366         u16 bit_value_template;
1367
1368         if (in_atomic()) {
1369                 dev_dbg_f(zd_usb_dev(usb),
1370                         "error: io in atomic context not supported\n");
1371                 return -EWOULDBLOCK;
1372         }
1373         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1374                 dev_dbg_f(zd_usb_dev(usb),
1375                         "error: bits %d are smaller than"
1376                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1377                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1378                 return -EINVAL;
1379         }
1380         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1381                 dev_dbg_f(zd_usb_dev(usb),
1382                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1383                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1384                 return -EINVAL;
1385         }
1386 #ifdef DEBUG
1387         if (value & (~0UL << bits)) {
1388                 dev_dbg_f(zd_usb_dev(usb),
1389                         "error: value %#09x has bits >= %d set\n",
1390                         value, bits);
1391                 return -EINVAL;
1392         }
1393 #endif /* DEBUG */
1394
1395         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1396
1397         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1398         if (r) {
1399                 dev_dbg_f(zd_usb_dev(usb),
1400                         "error %d: Couldn't read CR203\n", r);
1401                 goto out;
1402         }
1403         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1404
1405         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1406         req = kmalloc(req_len, GFP_NOFS);
1407         if (!req)
1408                 return -ENOMEM;
1409
1410         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1411         /* 1: 3683a, but not used in ZYDAS driver */
1412         req->value = cpu_to_le16(2);
1413         req->bits = cpu_to_le16(bits);
1414
1415         for (i = 0; i < bits; i++) {
1416                 u16 bv = bit_value_template;
1417                 if (value & (1 << (bits-1-i)))
1418                         bv |= RF_DATA;
1419                 req->bit_values[i] = cpu_to_le16(bv);
1420         }
1421
1422         udev = zd_usb_to_usbdev(usb);
1423         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1424                          req, req_len, &actual_req_len, 1000 /* ms */);
1425         if (r) {
1426                 dev_dbg_f(zd_usb_dev(usb),
1427                         "error in usb_bulk_msg(). Error number %d\n", r);
1428                 goto out;
1429         }
1430         if (req_len != actual_req_len) {
1431                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1432                         " req_len %d != actual_req_len %d\n",
1433                         req_len, actual_req_len);
1434                 r = -EIO;
1435                 goto out;
1436         }
1437
1438         /* FALL-THROUGH with r == 0 */
1439 out:
1440         kfree(req);
1441         return r;
1442 }