drivers/net/wireless/zd1211rw/zd_usb.c

   1 /* zd_usb.c
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  16  */
  17
  18 #include <asm/unaligned.h>
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/module.h>
  22 #include <linux/firmware.h>
  23 #include <linux/device.h>
  24 #include <linux/errno.h>
  25 #include <linux/skbuff.h>
  26 #include <linux/usb.h>
  27 #include <linux/workqueue.h>
  28 #include <net/ieee80211.h>
  29
  30 #include "zd_def.h"
  31 #include "zd_netdev.h"
  32 #include "zd_mac.h"
  33 #include "zd_usb.h"
  34 #include "zd_util.h"
  35
  36 static struct usb_device_id usb_ids[] = {
  37         /* ZD1211 */
  38         { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
  39         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
  40         { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
  41         { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
  42         { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
  43         { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
  44         { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
  45         { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
  46         { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
  47         { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
  48         { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
  49         { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
  50         { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
  51         { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
  52         { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
  53         { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
  54         { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
  55         /* ZD1211B */
  56         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  57         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  58         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  59         { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
  60         { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
  61         { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
  62         { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
  63         /* "Driverless" devices that need ejecting */
  64         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
  65         {}
  66 };
  67
  68 MODULE_LICENSE("GPL");
  69 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
  70 MODULE_AUTHOR("Ulrich Kunitz");
  71 MODULE_AUTHOR("Daniel Drake");
  72 MODULE_VERSION("1.0");
  73 MODULE_DEVICE_TABLE(usb, usb_ids);
  74
  75 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
  76 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
  77
  78 /* register address handling */
  79
  80 #ifdef DEBUG
  81 static int check_addr(struct zd_usb *usb, zd_addr_t addr)
  82 {
  83         u32 base = ZD_ADDR_BASE(addr);
  84         u32 offset = ZD_OFFSET(addr);
  85
  86         if ((u32)addr & ADDR_ZERO_MASK)
  87                 goto invalid_address;
  88         switch (base) {
  89         case USB_BASE:
  90                 break;
  91         case CR_BASE:
  92                 if (offset > CR_MAX_OFFSET) {
  93                         dev_dbg(zd_usb_dev(usb),
  94                                 "CR offset %#010x larger than"
  95                                 " CR_MAX_OFFSET %#10x\n",
  96                                 offset, CR_MAX_OFFSET);
  97                         goto invalid_address;
  98                 }
  99                 if (offset & 1) {
 100                         dev_dbg(zd_usb_dev(usb),
 101                                 "CR offset %#010x is not a multiple of 2\n",
 102                                 offset);
 103                         goto invalid_address;
 104                 }
 105                 break;
 106         case E2P_BASE:
 107                 if (offset > E2P_MAX_OFFSET) {
 108                         dev_dbg(zd_usb_dev(usb),
 109                                 "E2P offset %#010x larger than"
 110                                 " E2P_MAX_OFFSET %#010x\n",
 111                                 offset, E2P_MAX_OFFSET);
 112                         goto invalid_address;
 113                 }
 114                 break;
 115         case FW_BASE:
 116                 if (!usb->fw_base_offset) {
 117                         dev_dbg(zd_usb_dev(usb),
 118                                "ERROR: fw base offset has not been set\n");
 119                         return -EAGAIN;
 120                 }
 121                 if (offset > FW_MAX_OFFSET) {
 122                         dev_dbg(zd_usb_dev(usb),
 123                                 "FW offset %#10x is larger than"
 124                                 " FW_MAX_OFFSET %#010x\n",
 125                                 offset, FW_MAX_OFFSET);
 126                         goto invalid_address;
 127                 }
 128                 break;
 129         default:
 130                 dev_dbg(zd_usb_dev(usb),
 131                         "address has unsupported base %#010x\n", addr);
 132                 goto invalid_address;
 133         }
 134
 135         return 0;
 136 invalid_address:
 137         dev_dbg(zd_usb_dev(usb),
 138                 "ERROR: invalid address: %#010x\n", addr);
 139         return -EINVAL;
 140 }
 141 #endif /* DEBUG */
 142
 143 static u16 usb_addr(struct zd_usb *usb, zd_addr_t addr)
 144 {
 145         u32 base;
 146         u16 offset;
 147
 148         base = ZD_ADDR_BASE(addr);
 149         offset = ZD_OFFSET(addr);
 150
 151         ZD_ASSERT(check_addr(usb, addr) == 0);
 152
 153         switch (base) {
 154         case CR_BASE:
 155                 offset += CR_BASE_OFFSET;
 156                 break;
 157         case E2P_BASE:
 158                 offset += E2P_BASE_OFFSET;
 159                 break;
 160         case FW_BASE:
 161                 offset += usb->fw_base_offset;
 162                 break;
 163         }
 164
 165         return offset;
 166 }
 167
 168 /* USB device initialization */
 169
 170 static int request_fw_file(
 171         const struct firmware **fw, const char *name, struct device *device)
 172 {
 173         int r;
 174
 175         dev_dbg_f(device, "fw name %s\n", name);
 176
 177         r = request_firmware(fw, name, device);
 178         if (r)
 179                 dev_err(device,
 180                        "Could not load firmware file %s. Error number %d\n",
 181                        name, r);
 182         return r;
 183 }
 184
 185 static inline u16 get_bcdDevice(const struct usb_device *udev)
 186 {
 187         return le16_to_cpu(udev->descriptor.bcdDevice);
 188 }
 189
 190 enum upload_code_flags {
 191         REBOOT = 1,
 192 };
 193
 194 /* Ensures that MAX_TRANSFER_SIZE is even. */
 195 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 196
 197 static int upload_code(struct usb_device *udev,
 198         const u8 *data, size_t size, u16 code_offset, int flags)
 199 {
 200         u8 *p;
 201         int r;
 202
 203         /* USB request blocks need "kmalloced" buffers.
 204          */
 205         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 206         if (!p) {
 207                 dev_err(&udev->dev, "out of memory\n");
 208                 r = -ENOMEM;
 209                 goto error;
 210         }
 211
 212         size &= ~1;
 213         while (size > 0) {
 214                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 215                         size : MAX_TRANSFER_SIZE;
 216
 217                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 218
 219                 memcpy(p, data, transfer_size);
 220                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 221                         USB_REQ_FIRMWARE_DOWNLOAD,
 222                         USB_DIR_OUT | USB_TYPE_VENDOR,
 223                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 224                 if (r < 0) {
 225                         dev_err(&udev->dev,
 226                                "USB control request for firmware upload"
 227                                " failed. Error number %d\n", r);
 228                         goto error;
 229                 }
 230                 transfer_size = r & ~1;
 231
 232                 size -= transfer_size;
 233                 data += transfer_size;
 234                 code_offset += transfer_size/sizeof(u16);
 235         }
 236
 237         if (flags & REBOOT) {
 238                 u8 ret;
 239
 240                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 241                         USB_REQ_FIRMWARE_CONFIRM,
 242                         USB_DIR_IN | USB_TYPE_VENDOR,
 243                         0, 0, &ret, sizeof(ret), 5000 /* ms */);
 244                 if (r != sizeof(ret)) {
 245                         dev_err(&udev->dev,
 246                                 "control request firmeware confirmation failed."
 247                                 " Return value %d\n", r);
 248                         if (r >= 0)
 249                                 r = -ENODEV;
 250                         goto error;
 251                 }
 252                 if (ret & 0x80) {
 253                         dev_err(&udev->dev,
 254                                 "Internal error while downloading."
 255                                 " Firmware confirm return value %#04x\n",
 256                                 (unsigned int)ret);
 257                         r = -ENODEV;
 258                         goto error;
 259                 }
 260                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 261                         (unsigned int)ret);
 262         }
 263
 264         r = 0;
 265 error:
 266         kfree(p);
 267         return r;
 268 }
 269
 270 static u16 get_word(const void *data, u16 offset)
 271 {
 272         const __le16 *p = data;
 273         return le16_to_cpu(p[offset]);
 274 }
 275
 276 static char *get_fw_name(char *buffer, size_t size, u8 device_type,
 277                        const char* postfix)
 278 {
 279         scnprintf(buffer, size, "%s%s",
 280                 device_type == DEVICE_ZD1211B ?
 281                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 282                 postfix);
 283         return buffer;
 284 }
 285
 286 static int handle_version_mismatch(struct usb_device *udev, u8 device_type,
 287         const struct firmware *ub_fw)
 288 {
 289         const struct firmware *ur_fw = NULL;
 290         int offset;
 291         int r = 0;
 292         char fw_name[128];
 293
 294         r = request_fw_file(&ur_fw,
 295                 get_fw_name(fw_name, sizeof(fw_name), device_type, "ur"),
 296                 &udev->dev);
 297         if (r)
 298                 goto error;
 299
 300         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START_OFFSET,
 301                 REBOOT);
 302         if (r)
 303                 goto error;
 304
 305         offset = ((EEPROM_REGS_OFFSET + EEPROM_REGS_SIZE) * sizeof(u16));
 306         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
 307                 E2P_BASE_OFFSET + EEPROM_REGS_SIZE, REBOOT);
 308
 309         /* At this point, the vendor driver downloads the whole firmware
 310          * image, hacks around with version IDs, and uploads it again,
 311          * completely overwriting the boot code. We do not do this here as
 312          * it is not required on any tested devices, and it is suspected to
 313          * cause problems. */
 314 error:
 315         release_firmware(ur_fw);
 316         return r;
 317 }
 318
 319 static int upload_firmware(struct usb_device *udev, u8 device_type)
 320 {
 321         int r;
 322         u16 fw_bcdDevice;
 323         u16 bcdDevice;
 324         const struct firmware *ub_fw = NULL;
 325         const struct firmware *uph_fw = NULL;
 326         char fw_name[128];
 327
 328         bcdDevice = get_bcdDevice(udev);
 329
 330         r = request_fw_file(&ub_fw,
 331                 get_fw_name(fw_name, sizeof(fw_name), device_type,  "ub"),
 332                 &udev->dev);
 333         if (r)
 334                 goto error;
 335
 336         fw_bcdDevice = get_word(ub_fw->data, EEPROM_REGS_OFFSET);
 337
 338         if (fw_bcdDevice != bcdDevice) {
 339                 dev_info(&udev->dev,
 340                         "firmware version %#06x and device bootcode version "
 341                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
 342                 if (bcdDevice <= 0x4313)
 343                         dev_warn(&udev->dev, "device has old bootcode, please "
 344                                 "report success or failure\n");
 345
 346                 r = handle_version_mismatch(udev, device_type, ub_fw);
 347                 if (r)
 348                         goto error;
 349         } else {
 350                 dev_dbg_f(&udev->dev,
 351                         "firmware device id %#06x is equal to the "
 352                         "actual device id\n", fw_bcdDevice);
 353         }
 354
 355
 356         r = request_fw_file(&uph_fw,
 357                 get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"),
 358                 &udev->dev);
 359         if (r)
 360                 goto error;
 361
 362         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START_OFFSET,
 363                         REBOOT);
 364         if (r) {
 365                 dev_err(&udev->dev,
 366                         "Could not upload firmware code uph. Error number %d\n",
 367                         r);
 368         }
 369
 370         /* FALL-THROUGH */
 371 error:
 372         release_firmware(ub_fw);
 373         release_firmware(uph_fw);
 374         return r;
 375 }
 376
 377 #define urb_dev(urb) (&(urb)->dev->dev)
 378
 379 static inline void handle_regs_int(struct urb *urb)
 380 {
 381         struct zd_usb *usb = urb->context;
 382         struct zd_usb_interrupt *intr = &usb->intr;
 383         int len;
 384
 385         ZD_ASSERT(in_interrupt());
 386         spin_lock(&intr->lock);
 387
 388         if (intr->read_regs_enabled) {
 389                 intr->read_regs.length = len = urb->actual_length;
 390
 391                 if (len > sizeof(intr->read_regs.buffer))
 392                         len = sizeof(intr->read_regs.buffer);
 393                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 394                 intr->read_regs_enabled = 0;
 395                 complete(&intr->read_regs.completion);
 396                 goto out;
 397         }
 398
 399         dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
 400 out:
 401         spin_unlock(&intr->lock);
 402 }
 403
 404 static inline void handle_retry_failed_int(struct urb *urb)
 405 {
 406         dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
 407 }
 408
 409
 410 static void int_urb_complete(struct urb *urb)
 411 {
 412         int r;
 413         struct usb_int_header *hdr;
 414
 415         switch (urb->status) {
 416         case 0:
 417                 break;
 418         case -ESHUTDOWN:
 419         case -EINVAL:
 420         case -ENODEV:
 421         case -ENOENT:
 422         case -ECONNRESET:
 423         case -EPIPE:
 424                 goto kfree;
 425         default:
 426                 goto resubmit;
 427         }
 428
 429         if (urb->actual_length < sizeof(hdr)) {
 430                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 431                 goto resubmit;
 432         }
 433
 434         hdr = urb->transfer_buffer;
 435         if (hdr->type != USB_INT_TYPE) {
 436                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 437                 goto resubmit;
 438         }
 439
 440         switch (hdr->id) {
 441         case USB_INT_ID_REGS:
 442                 handle_regs_int(urb);
 443                 break;
 444         case USB_INT_ID_RETRY_FAILED:
 445                 handle_retry_failed_int(urb);
 446                 break;
 447         default:
 448                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 449                         (unsigned int)hdr->id);
 450                 goto resubmit;
 451         }
 452
 453 resubmit:
 454         r = usb_submit_urb(urb, GFP_ATOMIC);
 455         if (r) {
 456                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
 457                 goto kfree;
 458         }
 459         return;
 460 kfree:
 461         kfree(urb->transfer_buffer);
 462 }
 463
 464 static inline int int_urb_interval(struct usb_device *udev)
 465 {
 466         switch (udev->speed) {
 467         case USB_SPEED_HIGH:
 468                 return 4;
 469         case USB_SPEED_LOW:
 470                 return 10;
 471         case USB_SPEED_FULL:
 472         default:
 473                 return 1;
 474         }
 475 }
 476
 477 static inline int usb_int_enabled(struct zd_usb *usb)
 478 {
 479         unsigned long flags;
 480         struct zd_usb_interrupt *intr = &usb->intr;
 481         struct urb *urb;
 482
 483         spin_lock_irqsave(&intr->lock, flags);
 484         urb = intr->urb;
 485         spin_unlock_irqrestore(&intr->lock, flags);
 486         return urb != NULL;
 487 }
 488
 489 int zd_usb_enable_int(struct zd_usb *usb)
 490 {
 491         int r;
 492         struct usb_device *udev;
 493         struct zd_usb_interrupt *intr = &usb->intr;
 494         void *transfer_buffer = NULL;
 495         struct urb *urb;
 496
 497         dev_dbg_f(zd_usb_dev(usb), "\n");
 498
 499         urb = usb_alloc_urb(0, GFP_NOFS);
 500         if (!urb) {
 501                 r = -ENOMEM;
 502                 goto out;
 503         }
 504
 505         ZD_ASSERT(!irqs_disabled());
 506         spin_lock_irq(&intr->lock);
 507         if (intr->urb) {
 508                 spin_unlock_irq(&intr->lock);
 509                 r = 0;
 510                 goto error_free_urb;
 511         }
 512         intr->urb = urb;
 513         spin_unlock_irq(&intr->lock);
 514
 515         /* TODO: make it a DMA buffer */
 516         r = -ENOMEM;
 517         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_NOFS);
 518         if (!transfer_buffer) {
 519                 dev_dbg_f(zd_usb_dev(usb),
 520                         "couldn't allocate transfer_buffer\n");
 521                 goto error_set_urb_null;
 522         }
 523
 524         udev = zd_usb_to_usbdev(usb);
 525         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 526                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
 527                          int_urb_complete, usb,
 528                          intr->interval);
 529
 530         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 531         r = usb_submit_urb(urb, GFP_NOFS);
 532         if (r) {
 533                 dev_dbg_f(zd_usb_dev(usb),
 534                          "Couldn't submit urb. Error number %d\n", r);
 535                 goto error;
 536         }
 537
 538         return 0;
 539 error:
 540         kfree(transfer_buffer);
 541 error_set_urb_null:
 542         spin_lock_irq(&intr->lock);
 543         intr->urb = NULL;
 544         spin_unlock_irq(&intr->lock);
 545 error_free_urb:
 546         usb_free_urb(urb);
 547 out:
 548         return r;
 549 }
 550
 551 void zd_usb_disable_int(struct zd_usb *usb)
 552 {
 553         unsigned long flags;
 554         struct zd_usb_interrupt *intr = &usb->intr;
 555         struct urb *urb;
 556
 557         spin_lock_irqsave(&intr->lock, flags);
 558         urb = intr->urb;
 559         if (!urb) {
 560                 spin_unlock_irqrestore(&intr->lock, flags);
 561                 return;
 562         }
 563         intr->urb = NULL;
 564         spin_unlock_irqrestore(&intr->lock, flags);
 565
 566         usb_kill_urb(urb);
 567         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 568         usb_free_urb(urb);
 569 }
 570
 571 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 572                              unsigned int length)
 573 {
 574         int i;
 575         struct zd_mac *mac = zd_usb_to_mac(usb);
 576         const struct rx_length_info *length_info;
 577
 578         if (length < sizeof(struct rx_length_info)) {
 579                 /* It's not a complete packet anyhow. */
 580                 return;
 581         }
 582         length_info = (struct rx_length_info *)
 583                 (buffer + length - sizeof(struct rx_length_info));
 584
 585         /* It might be that three frames are merged into a single URB
 586          * transaction. We have to check for the length info tag.
 587          *
 588          * While testing we discovered that length_info might be unaligned,
 589          * because if USB transactions are merged, the last packet will not
 590          * be padded. Unaligned access might also happen if the length_info
 591          * structure is not present.
 592          */
 593         if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
 594         {
 595                 unsigned int l, k, n;
 596                 for (i = 0, l = 0;; i++) {
 597                         k = le16_to_cpu(get_unaligned(&length_info->length[i]));
 598                         if (k == 0)
 599                                 return;
 600                         n = l+k;
 601                         if (n > length)
 602                                 return;
 603                         zd_mac_rx_irq(mac, buffer+l, k);
 604                         if (i >= 2)
 605                                 return;
 606                         l = (n+3) & ~3;
 607                 }
 608         } else {
 609                 zd_mac_rx_irq(mac, buffer, length);
 610         }
 611 }
 612
 613 static void rx_urb_complete(struct urb *urb)
 614 {
 615         struct zd_usb *usb;
 616         struct zd_usb_rx *rx;
 617         const u8 *buffer;
 618         unsigned int length;
 619
 620         switch (urb->status) {
 621         case 0:
 622                 break;
 623         case -ESHUTDOWN:
 624         case -EINVAL:
 625         case -ENODEV:
 626         case -ENOENT:
 627         case -ECONNRESET:
 628         case -EPIPE:
 629                 return;
 630         default:
 631                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 632                 goto resubmit;
 633         }
 634
 635         buffer = urb->transfer_buffer;
 636         length = urb->actual_length;
 637         usb = urb->context;
 638         rx = &usb->rx;
 639
 640         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 641                 /* If there is an old first fragment, we don't care. */
 642                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 643                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 644                 spin_lock(&rx->lock);
 645                 memcpy(rx->fragment, buffer, length);
 646                 rx->fragment_length = length;
 647                 spin_unlock(&rx->lock);
 648                 goto resubmit;
 649         }
 650
 651         spin_lock(&rx->lock);
 652         if (rx->fragment_length > 0) {
 653                 /* We are on a second fragment, we believe */
 654                 ZD_ASSERT(length + rx->fragment_length <=
 655                           ARRAY_SIZE(rx->fragment));
 656                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 657                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 658                 handle_rx_packet(usb, rx->fragment,
 659                                  rx->fragment_length + length);
 660                 rx->fragment_length = 0;
 661                 spin_unlock(&rx->lock);
 662         } else {
 663                 spin_unlock(&rx->lock);
 664                 handle_rx_packet(usb, buffer, length);
 665         }
 666
 667 resubmit:
 668         usb_submit_urb(urb, GFP_ATOMIC);
 669 }
 670
 671 static struct urb *alloc_urb(struct zd_usb *usb)
 672 {
 673         struct usb_device *udev = zd_usb_to_usbdev(usb);
 674         struct urb *urb;
 675         void *buffer;
 676
 677         urb = usb_alloc_urb(0, GFP_NOFS);
 678         if (!urb)
 679                 return NULL;
 680         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_NOFS,
 681                                   &urb->transfer_dma);
 682         if (!buffer) {
 683                 usb_free_urb(urb);
 684                 return NULL;
 685         }
 686
 687         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 688                           buffer, USB_MAX_RX_SIZE,
 689                           rx_urb_complete, usb);
 690         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 691
 692         return urb;
 693 }
 694
 695 static void free_urb(struct urb *urb)
 696 {
 697         if (!urb)
 698                 return;
 699         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 700                         urb->transfer_buffer, urb->transfer_dma);
 701         usb_free_urb(urb);
 702 }
 703
 704 int zd_usb_enable_rx(struct zd_usb *usb)
 705 {
 706         int i, r;
 707         struct zd_usb_rx *rx = &usb->rx;
 708         struct urb **urbs;
 709
 710         dev_dbg_f(zd_usb_dev(usb), "\n");
 711
 712         r = -ENOMEM;
 713         urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_NOFS);
 714         if (!urbs)
 715                 goto error;
 716         for (i = 0; i < URBS_COUNT; i++) {
 717                 urbs[i] = alloc_urb(usb);
 718                 if (!urbs[i])
 719                         goto error;
 720         }
 721
 722         ZD_ASSERT(!irqs_disabled());
 723         spin_lock_irq(&rx->lock);
 724         if (rx->urbs) {
 725                 spin_unlock_irq(&rx->lock);
 726                 r = 0;
 727                 goto error;
 728         }
 729         rx->urbs = urbs;
 730         rx->urbs_count = URBS_COUNT;
 731         spin_unlock_irq(&rx->lock);
 732
 733         for (i = 0; i < URBS_COUNT; i++) {
 734                 r = usb_submit_urb(urbs[i], GFP_NOFS);
 735                 if (r)
 736                         goto error_submit;
 737         }
 738
 739         return 0;
 740 error_submit:
 741         for (i = 0; i < URBS_COUNT; i++) {
 742                 usb_kill_urb(urbs[i]);
 743         }
 744         spin_lock_irq(&rx->lock);
 745         rx->urbs = NULL;
 746         rx->urbs_count = 0;
 747         spin_unlock_irq(&rx->lock);
 748 error:
 749         if (urbs) {
 750                 for (i = 0; i < URBS_COUNT; i++)
 751                         free_urb(urbs[i]);
 752         }
 753         return r;
 754 }
 755
 756 void zd_usb_disable_rx(struct zd_usb *usb)
 757 {
 758         int i;
 759         unsigned long flags;
 760         struct urb **urbs;
 761         unsigned int count;
 762         struct zd_usb_rx *rx = &usb->rx;
 763
 764         spin_lock_irqsave(&rx->lock, flags);
 765         urbs = rx->urbs;
 766         count = rx->urbs_count;
 767         spin_unlock_irqrestore(&rx->lock, flags);
 768         if (!urbs)
 769                 return;
 770
 771         for (i = 0; i < count; i++) {
 772                 usb_kill_urb(urbs[i]);
 773                 free_urb(urbs[i]);
 774         }
 775         kfree(urbs);
 776
 777         spin_lock_irqsave(&rx->lock, flags);
 778         rx->urbs = NULL;
 779         rx->urbs_count = 0;
 780         spin_unlock_irqrestore(&rx->lock, flags);
 781 }
 782
 783 static void tx_urb_complete(struct urb *urb)
 784 {
 785         int r;
 786
 787         switch (urb->status) {
 788         case 0:
 789                 break;
 790         case -ESHUTDOWN:
 791         case -EINVAL:
 792         case -ENODEV:
 793         case -ENOENT:
 794         case -ECONNRESET:
 795         case -EPIPE:
 796                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 797                 break;
 798         default:
 799                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 800                 goto resubmit;
 801         }
 802 free_urb:
 803         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 804                         urb->transfer_buffer, urb->transfer_dma);
 805         usb_free_urb(urb);
 806         return;
 807 resubmit:
 808         r = usb_submit_urb(urb, GFP_ATOMIC);
 809         if (r) {
 810                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 811                 goto free_urb;
 812         }
 813 }
 814
 815 /* Puts the frame on the USB endpoint. It doesn't wait for
 816  * completion. The frame must contain the control set.
 817  */
 818 int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
 819 {
 820         int r;
 821         struct usb_device *udev = zd_usb_to_usbdev(usb);
 822         struct urb *urb;
 823         void *buffer;
 824
 825         urb = usb_alloc_urb(0, GFP_ATOMIC);
 826         if (!urb) {
 827                 r = -ENOMEM;
 828                 goto out;
 829         }
 830
 831         buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
 832                                   &urb->transfer_dma);
 833         if (!buffer) {
 834                 r = -ENOMEM;
 835                 goto error_free_urb;
 836         }
 837         memcpy(buffer, frame, length);
 838
 839         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 840                           buffer, length, tx_urb_complete, NULL);
 841         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 842
 843         r = usb_submit_urb(urb, GFP_ATOMIC);
 844         if (r)
 845                 goto error;
 846         return 0;
 847 error:
 848         usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
 849                         urb->transfer_dma);
 850 error_free_urb:
 851         usb_free_urb(urb);
 852 out:
 853         return r;
 854 }
 855
 856 static inline void init_usb_interrupt(struct zd_usb *usb)
 857 {
 858         struct zd_usb_interrupt *intr = &usb->intr;
 859
 860         spin_lock_init(&intr->lock);
 861         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 862         init_completion(&intr->read_regs.completion);
 863         intr->read_regs.cr_int_addr = cpu_to_le16(usb_addr(usb, CR_INTERRUPT));
 864 }
 865
 866 static inline void init_usb_rx(struct zd_usb *usb)
 867 {
 868         struct zd_usb_rx *rx = &usb->rx;
 869         spin_lock_init(&rx->lock);
 870         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 871                 rx->usb_packet_size = 512;
 872         } else {
 873                 rx->usb_packet_size = 64;
 874         }
 875         ZD_ASSERT(rx->fragment_length == 0);
 876 }
 877
 878 static inline void init_usb_tx(struct zd_usb *usb)
 879 {
 880         /* FIXME: at this point we will allocate a fixed number of urb's for
 881          * use in a cyclic scheme */
 882 }
 883
 884 void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
 885                  struct usb_interface *intf)
 886 {
 887         memset(usb, 0, sizeof(*usb));
 888         usb->intf = usb_get_intf(intf);
 889         usb_set_intfdata(usb->intf, netdev);
 890         init_usb_interrupt(usb);
 891         init_usb_tx(usb);
 892         init_usb_rx(usb);
 893 }
 894
 895 int zd_usb_init_hw(struct zd_usb *usb)
 896 {
 897         int r;
 898         struct zd_chip *chip = zd_usb_to_chip(usb);
 899
 900         ZD_ASSERT(mutex_is_locked(&chip->mutex));
 901         r = zd_ioread16_locked(chip, &usb->fw_base_offset,
 902                         USB_REG((u16)FW_BASE_ADDR_OFFSET));
 903         if (r)
 904                 return r;
 905         dev_dbg_f(zd_usb_dev(usb), "fw_base_offset: %#06hx\n",
 906                  usb->fw_base_offset);
 907
 908         return 0;
 909 }
 910
 911 void zd_usb_clear(struct zd_usb *usb)
 912 {
 913         usb_set_intfdata(usb->intf, NULL);
 914         usb_put_intf(usb->intf);
 915         ZD_MEMCLEAR(usb, sizeof(*usb));
 916         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
 917 }
 918
 919 static const char *speed(enum usb_device_speed speed)
 920 {
 921         switch (speed) {
 922         case USB_SPEED_LOW:
 923                 return "low";
 924         case USB_SPEED_FULL:
 925                 return "full";
 926         case USB_SPEED_HIGH:
 927                 return "high";
 928         default:
 929                 return "unknown speed";
 930         }
 931 }
 932
 933 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
 934 {
 935         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
 936                 le16_to_cpu(udev->descriptor.idVendor),
 937                 le16_to_cpu(udev->descriptor.idProduct),
 938                 get_bcdDevice(udev),
 939                 speed(udev->speed));
 940 }
 941
 942 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
 943 {
 944         struct usb_device *udev = interface_to_usbdev(usb->intf);
 945         return scnprint_id(udev, buffer, size);
 946 }
 947
 948 #ifdef DEBUG
 949 static void print_id(struct usb_device *udev)
 950 {
 951         char buffer[40];
 952
 953         scnprint_id(udev, buffer, sizeof(buffer));
 954         buffer[sizeof(buffer)-1] = 0;
 955         dev_dbg_f(&udev->dev, "%s\n", buffer);
 956 }
 957 #else
 958 #define print_id(udev) do { } while (0)
 959 #endif
 960
 961 static int eject_installer(struct usb_interface *intf)
 962 {
 963         struct usb_device *udev = interface_to_usbdev(intf);
 964         struct usb_host_interface *iface_desc = &intf->altsetting[0];
 965         struct usb_endpoint_descriptor *endpoint;
 966         unsigned char *cmd;
 967         u8 bulk_out_ep;
 968         int r;
 969
 970         /* Find bulk out endpoint */
 971         endpoint = &iface_desc->endpoint[1].desc;
 972         if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
 973             (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
 974             USB_ENDPOINT_XFER_BULK) {
 975                 bulk_out_ep = endpoint->bEndpointAddress;
 976         } else {
 977                 dev_err(&udev->dev,
 978                         "zd1211rw: Could not find bulk out endpoint\n");
 979                 return -ENODEV;
 980         }
 981
 982         cmd = kzalloc(31, GFP_KERNEL);
 983         if (cmd == NULL)
 984                 return -ENODEV;
 985
 986         /* USB bulk command block */
 987         cmd[0] = 0x55;  /* bulk command signature */
 988         cmd[1] = 0x53;  /* bulk command signature */
 989         cmd[2] = 0x42;  /* bulk command signature */
 990         cmd[3] = 0x43;  /* bulk command signature */
 991         cmd[14] = 6;    /* command length */
 992
 993         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
 994         cmd[19] = 0x2;  /* eject disc */
 995
 996         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
 997         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
 998                 cmd, 31, NULL, 2000);
 999         kfree(cmd);
1000         if (r)
1001                 return r;
1002
1003         /* At this point, the device disconnects and reconnects with the real
1004          * ID numbers. */
1005
1006         usb_set_intfdata(intf, NULL);
1007         return 0;
1008 }
1009
1010 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1011 {
1012         int r;
1013         struct usb_device *udev = interface_to_usbdev(intf);
1014         struct net_device *netdev = NULL;
1015
1016         print_id(udev);
1017
1018         if (id->driver_info & DEVICE_INSTALLER)
1019                 return eject_installer(intf);
1020
1021         switch (udev->speed) {
1022         case USB_SPEED_LOW:
1023         case USB_SPEED_FULL:
1024         case USB_SPEED_HIGH:
1025                 break;
1026         default:
1027                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1028                 r = -ENODEV;
1029                 goto error;
1030         }
1031
1032         netdev = zd_netdev_alloc(intf);
1033         if (netdev == NULL) {
1034                 r = -ENOMEM;
1035                 goto error;
1036         }
1037
1038         r = upload_firmware(udev, id->driver_info);
1039         if (r) {
1040                 dev_err(&intf->dev,
1041                        "couldn't load firmware. Error number %d\n", r);
1042                 goto error;
1043         }
1044
1045         r = usb_reset_configuration(udev);
1046         if (r) {
1047                 dev_dbg_f(&intf->dev,
1048                         "couldn't reset configuration. Error number %d\n", r);
1049                 goto error;
1050         }
1051
1052         /* At this point the interrupt endpoint is not generally enabled. We
1053          * save the USB bandwidth until the network device is opened. But
1054          * notify that the initialization of the MAC will require the
1055          * interrupts to be temporary enabled.
1056          */
1057         r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
1058         if (r) {
1059                 dev_dbg_f(&intf->dev,
1060                          "couldn't initialize mac. Error number %d\n", r);
1061                 goto error;
1062         }
1063
1064         r = register_netdev(netdev);
1065         if (r) {
1066                 dev_dbg_f(&intf->dev,
1067                          "couldn't register netdev. Error number %d\n", r);
1068                 goto error;
1069         }
1070
1071         dev_dbg_f(&intf->dev, "successful\n");
1072         dev_info(&intf->dev,"%s\n", netdev->name);
1073         return 0;
1074 error:
1075         usb_reset_device(interface_to_usbdev(intf));
1076         zd_netdev_free(netdev);
1077         return r;
1078 }
1079
1080 static void disconnect(struct usb_interface *intf)
1081 {
1082         struct net_device *netdev = zd_intf_to_netdev(intf);
1083         struct zd_mac *mac = zd_netdev_mac(netdev);
1084         struct zd_usb *usb = &mac->chip.usb;
1085
1086         /* Either something really bad happened, or we're just dealing with
1087          * a DEVICE_INSTALLER. */
1088         if (netdev == NULL)
1089                 return;
1090
1091         dev_dbg_f(zd_usb_dev(usb), "\n");
1092
1093         zd_netdev_disconnect(netdev);
1094
1095         /* Just in case something has gone wrong! */
1096         zd_usb_disable_rx(usb);
1097         zd_usb_disable_int(usb);
1098
1099         /* If the disconnect has been caused by a removal of the
1100          * driver module, the reset allows reloading of the driver. If the
1101          * reset will not be executed here, the upload of the firmware in the
1102          * probe function caused by the reloading of the driver will fail.
1103          */
1104         usb_reset_device(interface_to_usbdev(intf));
1105
1106         zd_netdev_free(netdev);
1107         dev_dbg(&intf->dev, "disconnected\n");
1108 }
1109
1110 static struct usb_driver driver = {
1111         .name           = "zd1211rw",
1112         .id_table       = usb_ids,
1113         .probe          = probe,
1114         .disconnect     = disconnect,
1115 };
1116
1117 struct workqueue_struct *zd_workqueue;
1118
1119 static int __init usb_init(void)
1120 {
1121         int r;
1122
1123         pr_debug("%s usb_init()\n", driver.name);
1124
1125         zd_workqueue = create_singlethread_workqueue(driver.name);
1126         if (zd_workqueue == NULL) {
1127                 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1128                 return -ENOMEM;
1129         }
1130
1131         r = usb_register(&driver);
1132         if (r) {
1133                 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1134                        driver.name, r);
1135                 return r;
1136         }
1137
1138         pr_debug("%s initialized\n", driver.name);
1139         return 0;
1140 }
1141
1142 static void __exit usb_exit(void)
1143 {
1144         pr_debug("%s usb_exit()\n", driver.name);
1145         usb_deregister(&driver);
1146         destroy_workqueue(zd_workqueue);
1147 }
1148
1149 module_init(usb_init);
1150 module_exit(usb_exit);
1151
1152 static int usb_int_regs_length(unsigned int count)
1153 {
1154         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1155 }
1156
1157 static void prepare_read_regs_int(struct zd_usb *usb)
1158 {
1159         struct zd_usb_interrupt *intr = &usb->intr;
1160
1161         spin_lock_irq(&intr->lock);
1162         intr->read_regs_enabled = 1;
1163         INIT_COMPLETION(intr->read_regs.completion);
1164         spin_unlock_irq(&intr->lock);
1165 }
1166
1167 static void disable_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 = 0;
1173         spin_unlock_irq(&intr->lock);
1174 }
1175
1176 static int get_results(struct zd_usb *usb, u16 *values,
1177                        struct usb_req_read_regs *req, unsigned int count)
1178 {
1179         int r;
1180         int i;
1181         struct zd_usb_interrupt *intr = &usb->intr;
1182         struct read_regs_int *rr = &intr->read_regs;
1183         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1184
1185         spin_lock_irq(&intr->lock);
1186
1187         r = -EIO;
1188         /* The created block size seems to be larger than expected.
1189          * However results appear to be correct.
1190          */
1191         if (rr->length < usb_int_regs_length(count)) {
1192                 dev_dbg_f(zd_usb_dev(usb),
1193                          "error: actual length %d less than expected %d\n",
1194                          rr->length, usb_int_regs_length(count));
1195                 goto error_unlock;
1196         }
1197         if (rr->length > sizeof(rr->buffer)) {
1198                 dev_dbg_f(zd_usb_dev(usb),
1199                          "error: actual length %d exceeds buffer size %zu\n",
1200                          rr->length, sizeof(rr->buffer));
1201                 goto error_unlock;
1202         }
1203
1204         for (i = 0; i < count; i++) {
1205                 struct reg_data *rd = &regs->regs[i];
1206                 if (rd->addr != req->addr[i]) {
1207                         dev_dbg_f(zd_usb_dev(usb),
1208                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1209                                  le16_to_cpu(rd->addr),
1210                                  le16_to_cpu(req->addr[i]));
1211                         goto error_unlock;
1212                 }
1213                 values[i] = le16_to_cpu(rd->value);
1214         }
1215
1216         r = 0;
1217 error_unlock:
1218         spin_unlock_irq(&intr->lock);
1219         return r;
1220 }
1221
1222 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1223                      const zd_addr_t *addresses, unsigned int count)
1224 {
1225         int r;
1226         int i, req_len, actual_req_len;
1227         struct usb_device *udev;
1228         struct usb_req_read_regs *req = NULL;
1229         unsigned long timeout;
1230
1231         if (count < 1) {
1232                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1233                 return -EINVAL;
1234         }
1235         if (count > USB_MAX_IOREAD16_COUNT) {
1236                 dev_dbg_f(zd_usb_dev(usb),
1237                          "error: count %u exceeds possible max %u\n",
1238                          count, USB_MAX_IOREAD16_COUNT);
1239                 return -EINVAL;
1240         }
1241         if (in_atomic()) {
1242                 dev_dbg_f(zd_usb_dev(usb),
1243                          "error: io in atomic context not supported\n");
1244                 return -EWOULDBLOCK;
1245         }
1246         if (!usb_int_enabled(usb)) {
1247                  dev_dbg_f(zd_usb_dev(usb),
1248                           "error: usb interrupt not enabled\n");
1249                 return -EWOULDBLOCK;
1250         }
1251
1252         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1253         req = kmalloc(req_len, GFP_NOFS);
1254         if (!req)
1255                 return -ENOMEM;
1256         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1257         for (i = 0; i < count; i++)
1258                 req->addr[i] = cpu_to_le16(usb_addr(usb, addresses[i]));
1259
1260         udev = zd_usb_to_usbdev(usb);
1261         prepare_read_regs_int(usb);
1262         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1263                          req, req_len, &actual_req_len, 1000 /* ms */);
1264         if (r) {
1265                 dev_dbg_f(zd_usb_dev(usb),
1266                         "error in usb_bulk_msg(). Error number %d\n", r);
1267                 goto error;
1268         }
1269         if (req_len != actual_req_len) {
1270                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1271                         " req_len %d != actual_req_len %d\n",
1272                         req_len, actual_req_len);
1273                 r = -EIO;
1274                 goto error;
1275         }
1276
1277         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1278                                               msecs_to_jiffies(1000));
1279         if (!timeout) {
1280                 disable_read_regs_int(usb);
1281                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1282                 r = -ETIMEDOUT;
1283                 goto error;
1284         }
1285
1286         r = get_results(usb, values, req, count);
1287 error:
1288         kfree(req);
1289         return r;
1290 }
1291
1292 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1293                       unsigned int count)
1294 {
1295         int r;
1296         struct usb_device *udev;
1297         struct usb_req_write_regs *req = NULL;
1298         int i, req_len, actual_req_len;
1299
1300         if (count == 0)
1301                 return 0;
1302         if (count > USB_MAX_IOWRITE16_COUNT) {
1303                 dev_dbg_f(zd_usb_dev(usb),
1304                         "error: count %u exceeds possible max %u\n",
1305                         count, USB_MAX_IOWRITE16_COUNT);
1306                 return -EINVAL;
1307         }
1308         if (in_atomic()) {
1309                 dev_dbg_f(zd_usb_dev(usb),
1310                         "error: io in atomic context not supported\n");
1311                 return -EWOULDBLOCK;
1312         }
1313
1314         req_len = sizeof(struct usb_req_write_regs) +
1315                   count * sizeof(struct reg_data);
1316         req = kmalloc(req_len, GFP_NOFS);
1317         if (!req)
1318                 return -ENOMEM;
1319
1320         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1321         for (i = 0; i < count; i++) {
1322                 struct reg_data *rw  = &req->reg_writes[i];
1323                 rw->addr = cpu_to_le16(usb_addr(usb, ioreqs[i].addr));
1324                 rw->value = cpu_to_le16(ioreqs[i].value);
1325         }
1326
1327         udev = zd_usb_to_usbdev(usb);
1328         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1329                          req, req_len, &actual_req_len, 1000 /* ms */);
1330         if (r) {
1331                 dev_dbg_f(zd_usb_dev(usb),
1332                         "error in usb_bulk_msg(). Error number %d\n", r);
1333                 goto error;
1334         }
1335         if (req_len != actual_req_len) {
1336                 dev_dbg_f(zd_usb_dev(usb),
1337                         "error in usb_bulk_msg()"
1338                         " req_len %d != actual_req_len %d\n",
1339                         req_len, actual_req_len);
1340                 r = -EIO;
1341                 goto error;
1342         }
1343
1344         /* FALL-THROUGH with r == 0 */
1345 error:
1346         kfree(req);
1347         return r;
1348 }
1349
1350 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1351 {
1352         int r;
1353         struct usb_device *udev;
1354         struct usb_req_rfwrite *req = NULL;
1355         int i, req_len, actual_req_len;
1356         u16 bit_value_template;
1357
1358         if (in_atomic()) {
1359                 dev_dbg_f(zd_usb_dev(usb),
1360                         "error: io in atomic context not supported\n");
1361                 return -EWOULDBLOCK;
1362         }
1363         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1364                 dev_dbg_f(zd_usb_dev(usb),
1365                         "error: bits %d are smaller than"
1366                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1367                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1368                 return -EINVAL;
1369         }
1370         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1371                 dev_dbg_f(zd_usb_dev(usb),
1372                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1373                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1374                 return -EINVAL;
1375         }
1376 #ifdef DEBUG
1377         if (value & (~0UL << bits)) {
1378                 dev_dbg_f(zd_usb_dev(usb),
1379                         "error: value %#09x has bits >= %d set\n",
1380                         value, bits);
1381                 return -EINVAL;
1382         }
1383 #endif /* DEBUG */
1384
1385         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1386
1387         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1388         if (r) {
1389                 dev_dbg_f(zd_usb_dev(usb),
1390                         "error %d: Couldn't read CR203\n", r);
1391                 goto out;
1392         }
1393         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1394
1395         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1396         req = kmalloc(req_len, GFP_NOFS);
1397         if (!req)
1398                 return -ENOMEM;
1399
1400         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1401         /* 1: 3683a, but not used in ZYDAS driver */
1402         req->value = cpu_to_le16(2);
1403         req->bits = cpu_to_le16(bits);
1404
1405         for (i = 0; i < bits; i++) {
1406                 u16 bv = bit_value_template;
1407                 if (value & (1 << (bits-1-i)))
1408                         bv |= RF_DATA;
1409                 req->bit_values[i] = cpu_to_le16(bv);
1410         }
1411
1412         udev = zd_usb_to_usbdev(usb);
1413         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1414                          req, req_len, &actual_req_len, 1000 /* ms */);
1415         if (r) {
1416                 dev_dbg_f(zd_usb_dev(usb),
1417                         "error in usb_bulk_msg(). Error number %d\n", r);
1418                 goto out;
1419         }
1420         if (req_len != actual_req_len) {
1421                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1422                         " req_len %d != actual_req_len %d\n",
1423                         req_len, actual_req_len);
1424                 r = -EIO;
1425                 goto out;
1426         }
1427
1428         /* FALL-THROUGH with r == 0 */
1429 out:
1430         kfree(req);
1431         return r;
1432 }