git.oblomov.eu Git - linux-2.6/blob - drivers/net/wireless/zd1211rw/zd_usb.c

   1 /* ZD1211 USB-WLAN driver for Linux
   2  *
   3  * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
   4  * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
   5  * Copyright (C) 2006-2007 Michael Wu <flamingice@sourmilk.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/init.h>
  24 #include <linux/firmware.h>
  25 #include <linux/device.h>
  26 #include <linux/errno.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/usb.h>
  29 #include <linux/workqueue.h>
  30 #include <net/mac80211.h>
  31 #include <asm/unaligned.h>
  32
  33 #include "zd_def.h"
  34 #include "zd_mac.h"
  35 #include "zd_usb.h"
  36
  37 static struct usb_device_id usb_ids[] = {
  38         /* ZD1211 */
  39         { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
  40         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
  41         { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
  42         { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
  43         { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
  44         { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
  45         { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
  46         { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
  47         { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
  48         { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
  49         { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
  50         { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
  51         { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
  52         { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
  53         { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
  54         { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
  55         { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
  56         { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
  57         { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
  58         { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
  59         { USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 },
  60         { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 },
  61         { USB_DEVICE(0x0105, 0x145f), .driver_info = DEVICE_ZD1211 },
  62         /* ZD1211B */
  63         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  64         { USB_DEVICE(0x0ace, 0xb215), .driver_info = DEVICE_ZD1211B },
  65         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  66         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  67         { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
  68         { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
  69         { USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B },
  70         { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
  71         { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
  72         { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
  73         { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
  74         { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
  75         { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
  76         { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
  77         { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
  78         { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
  79         { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
  80         { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
  81         { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
  82         { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
  83         { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
  84         { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
  85         { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
  86         { USB_DEVICE(0x07fa, 0x1196), .driver_info = DEVICE_ZD1211B },
  87         /* "Driverless" devices that need ejecting */
  88         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
  89         { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
  90         {}
  91 };
  92
  93 MODULE_LICENSE("GPL");
  94 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
  95 MODULE_AUTHOR("Ulrich Kunitz");
  96 MODULE_AUTHOR("Daniel Drake");
  97 MODULE_VERSION("1.0");
  98 MODULE_DEVICE_TABLE(usb, usb_ids);
  99
 100 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
 101 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
 102
 103 /* USB device initialization */
 104 static void int_urb_complete(struct urb *urb);
 105
 106 static int request_fw_file(
 107         const struct firmware **fw, const char *name, struct device *device)
 108 {
 109         int r;
 110
 111         dev_dbg_f(device, "fw name %s\n", name);
 112
 113         r = request_firmware(fw, name, device);
 114         if (r)
 115                 dev_err(device,
 116                        "Could not load firmware file %s. Error number %d\n",
 117                        name, r);
 118         return r;
 119 }
 120
 121 static inline u16 get_bcdDevice(const struct usb_device *udev)
 122 {
 123         return le16_to_cpu(udev->descriptor.bcdDevice);
 124 }
 125
 126 enum upload_code_flags {
 127         REBOOT = 1,
 128 };
 129
 130 /* Ensures that MAX_TRANSFER_SIZE is even. */
 131 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 132
 133 static int upload_code(struct usb_device *udev,
 134         const u8 *data, size_t size, u16 code_offset, int flags)
 135 {
 136         u8 *p;
 137         int r;
 138
 139         /* USB request blocks need "kmalloced" buffers.
 140          */
 141         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 142         if (!p) {
 143                 dev_err(&udev->dev, "out of memory\n");
 144                 r = -ENOMEM;
 145                 goto error;
 146         }
 147
 148         size &= ~1;
 149         while (size > 0) {
 150                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 151                         size : MAX_TRANSFER_SIZE;
 152
 153                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 154
 155                 memcpy(p, data, transfer_size);
 156                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 157                         USB_REQ_FIRMWARE_DOWNLOAD,
 158                         USB_DIR_OUT | USB_TYPE_VENDOR,
 159                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 160                 if (r < 0) {
 161                         dev_err(&udev->dev,
 162                                "USB control request for firmware upload"
 163                                " failed. Error number %d\n", r);
 164                         goto error;
 165                 }
 166                 transfer_size = r & ~1;
 167
 168                 size -= transfer_size;
 169                 data += transfer_size;
 170                 code_offset += transfer_size/sizeof(u16);
 171         }
 172
 173         if (flags & REBOOT) {
 174                 u8 ret;
 175
 176                 /* Use "DMA-aware" buffer. */
 177                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 178                         USB_REQ_FIRMWARE_CONFIRM,
 179                         USB_DIR_IN | USB_TYPE_VENDOR,
 180                         0, 0, p, sizeof(ret), 5000 /* ms */);
 181                 if (r != sizeof(ret)) {
 182                         dev_err(&udev->dev,
 183                                 "control request firmeware confirmation failed."
 184                                 " Return value %d\n", r);
 185                         if (r >= 0)
 186                                 r = -ENODEV;
 187                         goto error;
 188                 }
 189                 ret = p[0];
 190                 if (ret & 0x80) {
 191                         dev_err(&udev->dev,
 192                                 "Internal error while downloading."
 193                                 " Firmware confirm return value %#04x\n",
 194                                 (unsigned int)ret);
 195                         r = -ENODEV;
 196                         goto error;
 197                 }
 198                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 199                         (unsigned int)ret);
 200         }
 201
 202         r = 0;
 203 error:
 204         kfree(p);
 205         return r;
 206 }
 207
 208 static u16 get_word(const void *data, u16 offset)
 209 {
 210         const __le16 *p = data;
 211         return le16_to_cpu(p[offset]);
 212 }
 213
 214 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
 215                        const char* postfix)
 216 {
 217         scnprintf(buffer, size, "%s%s",
 218                 usb->is_zd1211b ?
 219                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 220                 postfix);
 221         return buffer;
 222 }
 223
 224 static int handle_version_mismatch(struct zd_usb *usb,
 225         const struct firmware *ub_fw)
 226 {
 227         struct usb_device *udev = zd_usb_to_usbdev(usb);
 228         const struct firmware *ur_fw = NULL;
 229         int offset;
 230         int r = 0;
 231         char fw_name[128];
 232
 233         r = request_fw_file(&ur_fw,
 234                 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
 235                 &udev->dev);
 236         if (r)
 237                 goto error;
 238
 239         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
 240         if (r)
 241                 goto error;
 242
 243         offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
 244         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
 245                 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
 246
 247         /* At this point, the vendor driver downloads the whole firmware
 248          * image, hacks around with version IDs, and uploads it again,
 249          * completely overwriting the boot code. We do not do this here as
 250          * it is not required on any tested devices, and it is suspected to
 251          * cause problems. */
 252 error:
 253         release_firmware(ur_fw);
 254         return r;
 255 }
 256
 257 static int upload_firmware(struct zd_usb *usb)
 258 {
 259         int r;
 260         u16 fw_bcdDevice;
 261         u16 bcdDevice;
 262         struct usb_device *udev = zd_usb_to_usbdev(usb);
 263         const struct firmware *ub_fw = NULL;
 264         const struct firmware *uph_fw = NULL;
 265         char fw_name[128];
 266
 267         bcdDevice = get_bcdDevice(udev);
 268
 269         r = request_fw_file(&ub_fw,
 270                 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
 271                 &udev->dev);
 272         if (r)
 273                 goto error;
 274
 275         fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
 276
 277         if (fw_bcdDevice != bcdDevice) {
 278                 dev_info(&udev->dev,
 279                         "firmware version %#06x and device bootcode version "
 280                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
 281                 if (bcdDevice <= 0x4313)
 282                         dev_warn(&udev->dev, "device has old bootcode, please "
 283                                 "report success or failure\n");
 284
 285                 r = handle_version_mismatch(usb, ub_fw);
 286                 if (r)
 287                         goto error;
 288         } else {
 289                 dev_dbg_f(&udev->dev,
 290                         "firmware device id %#06x is equal to the "
 291                         "actual device id\n", fw_bcdDevice);
 292         }
 293
 294
 295         r = request_fw_file(&uph_fw,
 296                 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
 297                 &udev->dev);
 298         if (r)
 299                 goto error;
 300
 301         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
 302         if (r) {
 303                 dev_err(&udev->dev,
 304                         "Could not upload firmware code uph. Error number %d\n",
 305                         r);
 306         }
 307
 308         /* FALL-THROUGH */
 309 error:
 310         release_firmware(ub_fw);
 311         release_firmware(uph_fw);
 312         return r;
 313 }
 314
 315 /* Read data from device address space using "firmware interface" which does
 316  * not require firmware to be loaded. */
 317 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
 318 {
 319         int r;
 320         struct usb_device *udev = zd_usb_to_usbdev(usb);
 321         u8 *buf;
 322
 323         /* Use "DMA-aware" buffer. */
 324         buf = kmalloc(len, GFP_KERNEL);
 325         if (!buf)
 326                 return -ENOMEM;
 327         r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 328                 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
 329                 buf, len, 5000);
 330         if (r < 0) {
 331                 dev_err(&udev->dev,
 332                         "read over firmware interface failed: %d\n", r);
 333                 goto exit;
 334         } else if (r != len) {
 335                 dev_err(&udev->dev,
 336                         "incomplete read over firmware interface: %d/%d\n",
 337                         r, len);
 338                 r = -EIO;
 339                 goto exit;
 340         }
 341         r = 0;
 342         memcpy(data, buf, len);
 343 exit:
 344         kfree(buf);
 345         return r;
 346 }
 347
 348 #define urb_dev(urb) (&(urb)->dev->dev)
 349
 350 static inline void handle_regs_int(struct urb *urb)
 351 {
 352         struct zd_usb *usb = urb->context;
 353         struct zd_usb_interrupt *intr = &usb->intr;
 354         int len;
 355         u16 int_num;
 356
 357         ZD_ASSERT(in_interrupt());
 358         spin_lock(&intr->lock);
 359
 360         int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));
 361         if (int_num == CR_INTERRUPT) {
 362                 struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
 363                 memcpy(&mac->intr_buffer, urb->transfer_buffer,
 364                                 USB_MAX_EP_INT_BUFFER);
 365                 schedule_work(&mac->process_intr);
 366         } else if (intr->read_regs_enabled) {
 367                 intr->read_regs.length = len = urb->actual_length;
 368
 369                 if (len > sizeof(intr->read_regs.buffer))
 370                         len = sizeof(intr->read_regs.buffer);
 371                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 372                 intr->read_regs_enabled = 0;
 373                 complete(&intr->read_regs.completion);
 374                 goto out;
 375         }
 376
 377 out:
 378         spin_unlock(&intr->lock);
 379 }
 380
 381 static void int_urb_complete(struct urb *urb)
 382 {
 383         int r;
 384         struct usb_int_header *hdr;
 385
 386         switch (urb->status) {
 387         case 0:
 388                 break;
 389         case -ESHUTDOWN:
 390         case -EINVAL:
 391         case -ENODEV:
 392         case -ENOENT:
 393         case -ECONNRESET:
 394         case -EPIPE:
 395                 goto kfree;
 396         default:
 397                 goto resubmit;
 398         }
 399
 400         if (urb->actual_length < sizeof(hdr)) {
 401                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 402                 goto resubmit;
 403         }
 404
 405         hdr = urb->transfer_buffer;
 406         if (hdr->type != USB_INT_TYPE) {
 407                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 408                 goto resubmit;
 409         }
 410
 411         switch (hdr->id) {
 412         case USB_INT_ID_REGS:
 413                 handle_regs_int(urb);
 414                 break;
 415         case USB_INT_ID_RETRY_FAILED:
 416                 zd_mac_tx_failed(zd_usb_to_hw(urb->context));
 417                 break;
 418         default:
 419                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 420                         (unsigned int)hdr->id);
 421                 goto resubmit;
 422         }
 423
 424 resubmit:
 425         r = usb_submit_urb(urb, GFP_ATOMIC);
 426         if (r) {
 427                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
 428                 goto kfree;
 429         }
 430         return;
 431 kfree:
 432         kfree(urb->transfer_buffer);
 433 }
 434
 435 static inline int int_urb_interval(struct usb_device *udev)
 436 {
 437         switch (udev->speed) {
 438         case USB_SPEED_HIGH:
 439                 return 4;
 440         case USB_SPEED_LOW:
 441                 return 10;
 442         case USB_SPEED_FULL:
 443         default:
 444                 return 1;
 445         }
 446 }
 447
 448 static inline int usb_int_enabled(struct zd_usb *usb)
 449 {
 450         unsigned long flags;
 451         struct zd_usb_interrupt *intr = &usb->intr;
 452         struct urb *urb;
 453
 454         spin_lock_irqsave(&intr->lock, flags);
 455         urb = intr->urb;
 456         spin_unlock_irqrestore(&intr->lock, flags);
 457         return urb != NULL;
 458 }
 459
 460 int zd_usb_enable_int(struct zd_usb *usb)
 461 {
 462         int r;
 463         struct usb_device *udev;
 464         struct zd_usb_interrupt *intr = &usb->intr;
 465         void *transfer_buffer = NULL;
 466         struct urb *urb;
 467
 468         dev_dbg_f(zd_usb_dev(usb), "\n");
 469
 470         urb = usb_alloc_urb(0, GFP_KERNEL);
 471         if (!urb) {
 472                 r = -ENOMEM;
 473                 goto out;
 474         }
 475
 476         ZD_ASSERT(!irqs_disabled());
 477         spin_lock_irq(&intr->lock);
 478         if (intr->urb) {
 479                 spin_unlock_irq(&intr->lock);
 480                 r = 0;
 481                 goto error_free_urb;
 482         }
 483         intr->urb = urb;
 484         spin_unlock_irq(&intr->lock);
 485
 486         /* TODO: make it a DMA buffer */
 487         r = -ENOMEM;
 488         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
 489         if (!transfer_buffer) {
 490                 dev_dbg_f(zd_usb_dev(usb),
 491                         "couldn't allocate transfer_buffer\n");
 492                 goto error_set_urb_null;
 493         }
 494
 495         udev = zd_usb_to_usbdev(usb);
 496         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 497                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
 498                          int_urb_complete, usb,
 499                          intr->interval);
 500
 501         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 502         r = usb_submit_urb(urb, GFP_KERNEL);
 503         if (r) {
 504                 dev_dbg_f(zd_usb_dev(usb),
 505                          "Couldn't submit urb. Error number %d\n", r);
 506                 goto error;
 507         }
 508
 509         return 0;
 510 error:
 511         kfree(transfer_buffer);
 512 error_set_urb_null:
 513         spin_lock_irq(&intr->lock);
 514         intr->urb = NULL;
 515         spin_unlock_irq(&intr->lock);
 516 error_free_urb:
 517         usb_free_urb(urb);
 518 out:
 519         return r;
 520 }
 521
 522 void zd_usb_disable_int(struct zd_usb *usb)
 523 {
 524         unsigned long flags;
 525         struct zd_usb_interrupt *intr = &usb->intr;
 526         struct urb *urb;
 527
 528         spin_lock_irqsave(&intr->lock, flags);
 529         urb = intr->urb;
 530         if (!urb) {
 531                 spin_unlock_irqrestore(&intr->lock, flags);
 532                 return;
 533         }
 534         intr->urb = NULL;
 535         spin_unlock_irqrestore(&intr->lock, flags);
 536
 537         usb_kill_urb(urb);
 538         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 539         usb_free_urb(urb);
 540 }
 541
 542 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 543                              unsigned int length)
 544 {
 545         int i;
 546         const struct rx_length_info *length_info;
 547
 548         if (length < sizeof(struct rx_length_info)) {
 549                 /* It's not a complete packet anyhow. */
 550                 return;
 551         }
 552         length_info = (struct rx_length_info *)
 553                 (buffer + length - sizeof(struct rx_length_info));
 554
 555         /* It might be that three frames are merged into a single URB
 556          * transaction. We have to check for the length info tag.
 557          *
 558          * While testing we discovered that length_info might be unaligned,
 559          * because if USB transactions are merged, the last packet will not
 560          * be padded. Unaligned access might also happen if the length_info
 561          * structure is not present.
 562          */
 563         if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG)
 564         {
 565                 unsigned int l, k, n;
 566                 for (i = 0, l = 0;; i++) {
 567                         k = get_unaligned_le16(&length_info->length[i]);
 568                         if (k == 0)
 569                                 return;
 570                         n = l+k;
 571                         if (n > length)
 572                                 return;
 573                         zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
 574                         if (i >= 2)
 575                                 return;
 576                         l = (n+3) & ~3;
 577                 }
 578         } else {
 579                 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
 580         }
 581 }
 582
 583 static void rx_urb_complete(struct urb *urb)
 584 {
 585         struct zd_usb *usb;
 586         struct zd_usb_rx *rx;
 587         const u8 *buffer;
 588         unsigned int length;
 589
 590         switch (urb->status) {
 591         case 0:
 592                 break;
 593         case -ESHUTDOWN:
 594         case -EINVAL:
 595         case -ENODEV:
 596         case -ENOENT:
 597         case -ECONNRESET:
 598         case -EPIPE:
 599                 return;
 600         default:
 601                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 602                 goto resubmit;
 603         }
 604
 605         buffer = urb->transfer_buffer;
 606         length = urb->actual_length;
 607         usb = urb->context;
 608         rx = &usb->rx;
 609
 610         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 611                 /* If there is an old first fragment, we don't care. */
 612                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 613                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 614                 spin_lock(&rx->lock);
 615                 memcpy(rx->fragment, buffer, length);
 616                 rx->fragment_length = length;
 617                 spin_unlock(&rx->lock);
 618                 goto resubmit;
 619         }
 620
 621         spin_lock(&rx->lock);
 622         if (rx->fragment_length > 0) {
 623                 /* We are on a second fragment, we believe */
 624                 ZD_ASSERT(length + rx->fragment_length <=
 625                           ARRAY_SIZE(rx->fragment));
 626                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 627                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 628                 handle_rx_packet(usb, rx->fragment,
 629                                  rx->fragment_length + length);
 630                 rx->fragment_length = 0;
 631                 spin_unlock(&rx->lock);
 632         } else {
 633                 spin_unlock(&rx->lock);
 634                 handle_rx_packet(usb, buffer, length);
 635         }
 636
 637 resubmit:
 638         usb_submit_urb(urb, GFP_ATOMIC);
 639 }
 640
 641 static struct urb *alloc_rx_urb(struct zd_usb *usb)
 642 {
 643         struct usb_device *udev = zd_usb_to_usbdev(usb);
 644         struct urb *urb;
 645         void *buffer;
 646
 647         urb = usb_alloc_urb(0, GFP_KERNEL);
 648         if (!urb)
 649                 return NULL;
 650         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
 651                                   &urb->transfer_dma);
 652         if (!buffer) {
 653                 usb_free_urb(urb);
 654                 return NULL;
 655         }
 656
 657         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 658                           buffer, USB_MAX_RX_SIZE,
 659                           rx_urb_complete, usb);
 660         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 661
 662         return urb;
 663 }
 664
 665 static void free_rx_urb(struct urb *urb)
 666 {
 667         if (!urb)
 668                 return;
 669         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 670                         urb->transfer_buffer, urb->transfer_dma);
 671         usb_free_urb(urb);
 672 }
 673
 674 int zd_usb_enable_rx(struct zd_usb *usb)
 675 {
 676         int i, r;
 677         struct zd_usb_rx *rx = &usb->rx;
 678         struct urb **urbs;
 679
 680         dev_dbg_f(zd_usb_dev(usb), "\n");
 681
 682         r = -ENOMEM;
 683         urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
 684         if (!urbs)
 685                 goto error;
 686         for (i = 0; i < RX_URBS_COUNT; i++) {
 687                 urbs[i] = alloc_rx_urb(usb);
 688                 if (!urbs[i])
 689                         goto error;
 690         }
 691
 692         ZD_ASSERT(!irqs_disabled());
 693         spin_lock_irq(&rx->lock);
 694         if (rx->urbs) {
 695                 spin_unlock_irq(&rx->lock);
 696                 r = 0;
 697                 goto error;
 698         }
 699         rx->urbs = urbs;
 700         rx->urbs_count = RX_URBS_COUNT;
 701         spin_unlock_irq(&rx->lock);
 702
 703         for (i = 0; i < RX_URBS_COUNT; i++) {
 704                 r = usb_submit_urb(urbs[i], GFP_KERNEL);
 705                 if (r)
 706                         goto error_submit;
 707         }
 708
 709         return 0;
 710 error_submit:
 711         for (i = 0; i < RX_URBS_COUNT; i++) {
 712                 usb_kill_urb(urbs[i]);
 713         }
 714         spin_lock_irq(&rx->lock);
 715         rx->urbs = NULL;
 716         rx->urbs_count = 0;
 717         spin_unlock_irq(&rx->lock);
 718 error:
 719         if (urbs) {
 720                 for (i = 0; i < RX_URBS_COUNT; i++)
 721                         free_rx_urb(urbs[i]);
 722         }
 723         return r;
 724 }
 725
 726 void zd_usb_disable_rx(struct zd_usb *usb)
 727 {
 728         int i;
 729         unsigned long flags;
 730         struct urb **urbs;
 731         unsigned int count;
 732         struct zd_usb_rx *rx = &usb->rx;
 733
 734         spin_lock_irqsave(&rx->lock, flags);
 735         urbs = rx->urbs;
 736         count = rx->urbs_count;
 737         spin_unlock_irqrestore(&rx->lock, flags);
 738         if (!urbs)
 739                 return;
 740
 741         for (i = 0; i < count; i++) {
 742                 usb_kill_urb(urbs[i]);
 743                 free_rx_urb(urbs[i]);
 744         }
 745         kfree(urbs);
 746
 747         spin_lock_irqsave(&rx->lock, flags);
 748         rx->urbs = NULL;
 749         rx->urbs_count = 0;
 750         spin_unlock_irqrestore(&rx->lock, flags);
 751 }
 752
 753 /**
 754  * zd_usb_disable_tx - disable transmission
 755  * @usb: the zd1211rw-private USB structure
 756  *
 757  * Frees all URBs in the free list and marks the transmission as disabled.
 758  */
 759 void zd_usb_disable_tx(struct zd_usb *usb)
 760 {
 761         struct zd_usb_tx *tx = &usb->tx;
 762         unsigned long flags;
 763         struct list_head *pos, *n;
 764
 765         spin_lock_irqsave(&tx->lock, flags);
 766         list_for_each_safe(pos, n, &tx->free_urb_list) {
 767                 list_del(pos);
 768                 usb_free_urb(list_entry(pos, struct urb, urb_list));
 769         }
 770         tx->enabled = 0;
 771         tx->submitted_urbs = 0;
 772         /* The stopped state is ignored, relying on ieee80211_wake_queues()
 773          * in a potentionally following zd_usb_enable_tx().
 774          */
 775         spin_unlock_irqrestore(&tx->lock, flags);
 776 }
 777
 778 /**
 779  * zd_usb_enable_tx - enables transmission
 780  * @usb: a &struct zd_usb pointer
 781  *
 782  * This function enables transmission and prepares the &zd_usb_tx data
 783  * structure.
 784  */
 785 void zd_usb_enable_tx(struct zd_usb *usb)
 786 {
 787         unsigned long flags;
 788         struct zd_usb_tx *tx = &usb->tx;
 789
 790         spin_lock_irqsave(&tx->lock, flags);
 791         tx->enabled = 1;
 792         tx->submitted_urbs = 0;
 793         ieee80211_wake_queues(zd_usb_to_hw(usb));
 794         tx->stopped = 0;
 795         spin_unlock_irqrestore(&tx->lock, flags);
 796 }
 797
 798 /**
 799  * alloc_tx_urb - provides an tx URB
 800  * @usb: a &struct zd_usb pointer
 801  *
 802  * Allocates a new URB. If possible takes the urb from the free list in
 803  * usb->tx.
 804  */
 805 static struct urb *alloc_tx_urb(struct zd_usb *usb)
 806 {
 807         struct zd_usb_tx *tx = &usb->tx;
 808         unsigned long flags;
 809         struct list_head *entry;
 810         struct urb *urb;
 811
 812         spin_lock_irqsave(&tx->lock, flags);
 813         if (list_empty(&tx->free_urb_list)) {
 814                 urb = usb_alloc_urb(0, GFP_ATOMIC);
 815                 goto out;
 816         }
 817         entry = tx->free_urb_list.next;
 818         list_del(entry);
 819         urb = list_entry(entry, struct urb, urb_list);
 820 out:
 821         spin_unlock_irqrestore(&tx->lock, flags);
 822         return urb;
 823 }
 824
 825 /**
 826  * free_tx_urb - frees a used tx URB
 827  * @usb: a &struct zd_usb pointer
 828  * @urb: URB to be freed
 829  *
 830  * Frees the the transmission URB, which means to put it on the free URB
 831  * list.
 832  */
 833 static void free_tx_urb(struct zd_usb *usb, struct urb *urb)
 834 {
 835         struct zd_usb_tx *tx = &usb->tx;
 836         unsigned long flags;
 837
 838         spin_lock_irqsave(&tx->lock, flags);
 839         if (!tx->enabled) {
 840                 usb_free_urb(urb);
 841                 goto out;
 842         }
 843         list_add(&urb->urb_list, &tx->free_urb_list);
 844 out:
 845         spin_unlock_irqrestore(&tx->lock, flags);
 846 }
 847
 848 static void tx_dec_submitted_urbs(struct zd_usb *usb)
 849 {
 850         struct zd_usb_tx *tx = &usb->tx;
 851         unsigned long flags;
 852
 853         spin_lock_irqsave(&tx->lock, flags);
 854         --tx->submitted_urbs;
 855         if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) {
 856                 ieee80211_wake_queues(zd_usb_to_hw(usb));
 857                 tx->stopped = 0;
 858         }
 859         spin_unlock_irqrestore(&tx->lock, flags);
 860 }
 861
 862 static void tx_inc_submitted_urbs(struct zd_usb *usb)
 863 {
 864         struct zd_usb_tx *tx = &usb->tx;
 865         unsigned long flags;
 866
 867         spin_lock_irqsave(&tx->lock, flags);
 868         ++tx->submitted_urbs;
 869         if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
 870                 ieee80211_stop_queues(zd_usb_to_hw(usb));
 871                 tx->stopped = 1;
 872         }
 873         spin_unlock_irqrestore(&tx->lock, flags);
 874 }
 875
 876 /**
 877  * tx_urb_complete - completes the execution of an URB
 878  * @urb: a URB
 879  *
 880  * This function is called if the URB has been transferred to a device or an
 881  * error has happened.
 882  */
 883 static void tx_urb_complete(struct urb *urb)
 884 {
 885         int r;
 886         struct sk_buff *skb;
 887         struct ieee80211_tx_info *info;
 888         struct zd_usb *usb;
 889
 890         switch (urb->status) {
 891         case 0:
 892                 break;
 893         case -ESHUTDOWN:
 894         case -EINVAL:
 895         case -ENODEV:
 896         case -ENOENT:
 897         case -ECONNRESET:
 898         case -EPIPE:
 899                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 900                 break;
 901         default:
 902                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 903                 goto resubmit;
 904         }
 905 free_urb:
 906         skb = (struct sk_buff *)urb->context;
 907         /*
 908          * grab 'usb' pointer before handing off the skb (since
 909          * it might be freed by zd_mac_tx_to_dev or mac80211)
 910          */
 911         info = IEEE80211_SKB_CB(skb);
 912         usb = &zd_hw_mac(info->rate_driver_data[0])->chip.usb;
 913         zd_mac_tx_to_dev(skb, urb->status);
 914         free_tx_urb(usb, urb);
 915         tx_dec_submitted_urbs(usb);
 916         return;
 917 resubmit:
 918         r = usb_submit_urb(urb, GFP_ATOMIC);
 919         if (r) {
 920                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 921                 goto free_urb;
 922         }
 923 }
 924
 925 /**
 926  * zd_usb_tx: initiates transfer of a frame of the device
 927  *
 928  * @usb: the zd1211rw-private USB structure
 929  * @skb: a &struct sk_buff pointer
 930  *
 931  * This function tranmits a frame to the device. It doesn't wait for
 932  * completion. The frame must contain the control set and have all the
 933  * control set information available.
 934  *
 935  * The function returns 0 if the transfer has been successfully initiated.
 936  */
 937 int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
 938 {
 939         int r;
 940         struct usb_device *udev = zd_usb_to_usbdev(usb);
 941         struct urb *urb;
 942
 943         urb = alloc_tx_urb(usb);
 944         if (!urb) {
 945                 r = -ENOMEM;
 946                 goto out;
 947         }
 948
 949         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 950                           skb->data, skb->len, tx_urb_complete, skb);
 951
 952         r = usb_submit_urb(urb, GFP_ATOMIC);
 953         if (r)
 954                 goto error;
 955         tx_inc_submitted_urbs(usb);
 956         return 0;
 957 error:
 958         free_tx_urb(usb, urb);
 959 out:
 960         return r;
 961 }
 962
 963 static inline void init_usb_interrupt(struct zd_usb *usb)
 964 {
 965         struct zd_usb_interrupt *intr = &usb->intr;
 966
 967         spin_lock_init(&intr->lock);
 968         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 969         init_completion(&intr->read_regs.completion);
 970         intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
 971 }
 972
 973 static inline void init_usb_rx(struct zd_usb *usb)
 974 {
 975         struct zd_usb_rx *rx = &usb->rx;
 976         spin_lock_init(&rx->lock);
 977         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 978                 rx->usb_packet_size = 512;
 979         } else {
 980                 rx->usb_packet_size = 64;
 981         }
 982         ZD_ASSERT(rx->fragment_length == 0);
 983 }
 984
 985 static inline void init_usb_tx(struct zd_usb *usb)
 986 {
 987         struct zd_usb_tx *tx = &usb->tx;
 988         spin_lock_init(&tx->lock);
 989         tx->enabled = 0;
 990         tx->stopped = 0;
 991         INIT_LIST_HEAD(&tx->free_urb_list);
 992         tx->submitted_urbs = 0;
 993 }
 994
 995 void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
 996                  struct usb_interface *intf)
 997 {
 998         memset(usb, 0, sizeof(*usb));
 999         usb->intf = usb_get_intf(intf);
1000         usb_set_intfdata(usb->intf, hw);
1001         init_usb_interrupt(usb);
1002         init_usb_tx(usb);
1003         init_usb_rx(usb);
1004 }
1005
1006 void zd_usb_clear(struct zd_usb *usb)
1007 {
1008         usb_set_intfdata(usb->intf, NULL);
1009         usb_put_intf(usb->intf);
1010         ZD_MEMCLEAR(usb, sizeof(*usb));
1011         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
1012 }
1013
1014 static const char *speed(enum usb_device_speed speed)
1015 {
1016         switch (speed) {
1017         case USB_SPEED_LOW:
1018                 return "low";
1019         case USB_SPEED_FULL:
1020                 return "full";
1021         case USB_SPEED_HIGH:
1022                 return "high";
1023         default:
1024                 return "unknown speed";
1025         }
1026 }
1027
1028 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
1029 {
1030         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1031                 le16_to_cpu(udev->descriptor.idVendor),
1032                 le16_to_cpu(udev->descriptor.idProduct),
1033                 get_bcdDevice(udev),
1034                 speed(udev->speed));
1035 }
1036
1037 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1038 {
1039         struct usb_device *udev = interface_to_usbdev(usb->intf);
1040         return scnprint_id(udev, buffer, size);
1041 }
1042
1043 #ifdef DEBUG
1044 static void print_id(struct usb_device *udev)
1045 {
1046         char buffer[40];
1047
1048         scnprint_id(udev, buffer, sizeof(buffer));
1049         buffer[sizeof(buffer)-1] = 0;
1050         dev_dbg_f(&udev->dev, "%s\n", buffer);
1051 }
1052 #else
1053 #define print_id(udev) do { } while (0)
1054 #endif
1055
1056 static int eject_installer(struct usb_interface *intf)
1057 {
1058         struct usb_device *udev = interface_to_usbdev(intf);
1059         struct usb_host_interface *iface_desc = &intf->altsetting[0];
1060         struct usb_endpoint_descriptor *endpoint;
1061         unsigned char *cmd;
1062         u8 bulk_out_ep;
1063         int r;
1064
1065         /* Find bulk out endpoint */
1066         endpoint = &iface_desc->endpoint[1].desc;
1067         if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
1068             usb_endpoint_xfer_bulk(endpoint)) {
1069                 bulk_out_ep = endpoint->bEndpointAddress;
1070         } else {
1071                 dev_err(&udev->dev,
1072                         "zd1211rw: Could not find bulk out endpoint\n");
1073                 return -ENODEV;
1074         }
1075
1076         cmd = kzalloc(31, GFP_KERNEL);
1077         if (cmd == NULL)
1078                 return -ENODEV;
1079
1080         /* USB bulk command block */
1081         cmd[0] = 0x55;  /* bulk command signature */
1082         cmd[1] = 0x53;  /* bulk command signature */
1083         cmd[2] = 0x42;  /* bulk command signature */
1084         cmd[3] = 0x43;  /* bulk command signature */
1085         cmd[14] = 6;    /* command length */
1086
1087         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1088         cmd[19] = 0x2;  /* eject disc */
1089
1090         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1091         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1092                 cmd, 31, NULL, 2000);
1093         kfree(cmd);
1094         if (r)
1095                 return r;
1096
1097         /* At this point, the device disconnects and reconnects with the real
1098          * ID numbers. */
1099
1100         usb_set_intfdata(intf, NULL);
1101         return 0;
1102 }
1103
1104 int zd_usb_init_hw(struct zd_usb *usb)
1105 {
1106         int r;
1107         struct zd_mac *mac = zd_usb_to_mac(usb);
1108
1109         dev_dbg_f(zd_usb_dev(usb), "\n");
1110
1111         r = upload_firmware(usb);
1112         if (r) {
1113                 dev_err(zd_usb_dev(usb),
1114                        "couldn't load firmware. Error number %d\n", r);
1115                 return r;
1116         }
1117
1118         r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1119         if (r) {
1120                 dev_dbg_f(zd_usb_dev(usb),
1121                         "couldn't reset configuration. Error number %d\n", r);
1122                 return r;
1123         }
1124
1125         r = zd_mac_init_hw(mac->hw);
1126         if (r) {
1127                 dev_dbg_f(zd_usb_dev(usb),
1128                          "couldn't initialize mac. Error number %d\n", r);
1129                 return r;
1130         }
1131
1132         usb->initialized = 1;
1133         return 0;
1134 }
1135
1136 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1137 {
1138         int r;
1139         struct usb_device *udev = interface_to_usbdev(intf);
1140         struct zd_usb *usb;
1141         struct ieee80211_hw *hw = NULL;
1142
1143         print_id(udev);
1144
1145         if (id->driver_info & DEVICE_INSTALLER)
1146                 return eject_installer(intf);
1147
1148         switch (udev->speed) {
1149         case USB_SPEED_LOW:
1150         case USB_SPEED_FULL:
1151         case USB_SPEED_HIGH:
1152                 break;
1153         default:
1154                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1155                 r = -ENODEV;
1156                 goto error;
1157         }
1158
1159         r = usb_reset_device(udev);
1160         if (r) {
1161                 dev_err(&intf->dev,
1162                         "couldn't reset usb device. Error number %d\n", r);
1163                 goto error;
1164         }
1165
1166         hw = zd_mac_alloc_hw(intf);
1167         if (hw == NULL) {
1168                 r = -ENOMEM;
1169                 goto error;
1170         }
1171
1172         usb = &zd_hw_mac(hw)->chip.usb;
1173         usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1174
1175         r = zd_mac_preinit_hw(hw);
1176         if (r) {
1177                 dev_dbg_f(&intf->dev,
1178                          "couldn't initialize mac. Error number %d\n", r);
1179                 goto error;
1180         }
1181
1182         r = ieee80211_register_hw(hw);
1183         if (r) {
1184                 dev_dbg_f(&intf->dev,
1185                          "couldn't register device. Error number %d\n", r);
1186                 goto error;
1187         }
1188
1189         dev_dbg_f(&intf->dev, "successful\n");
1190         dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
1191         return 0;
1192 error:
1193         usb_reset_device(interface_to_usbdev(intf));
1194         if (hw) {
1195                 zd_mac_clear(zd_hw_mac(hw));
1196                 ieee80211_free_hw(hw);
1197         }
1198         return r;
1199 }
1200
1201 static void disconnect(struct usb_interface *intf)
1202 {
1203         struct ieee80211_hw *hw = zd_intf_to_hw(intf);
1204         struct zd_mac *mac;
1205         struct zd_usb *usb;
1206
1207         /* Either something really bad happened, or we're just dealing with
1208          * a DEVICE_INSTALLER. */
1209         if (hw == NULL)
1210                 return;
1211
1212         mac = zd_hw_mac(hw);
1213         usb = &mac->chip.usb;
1214
1215         dev_dbg_f(zd_usb_dev(usb), "\n");
1216
1217         ieee80211_unregister_hw(hw);
1218
1219         /* Just in case something has gone wrong! */
1220         zd_usb_disable_rx(usb);
1221         zd_usb_disable_int(usb);
1222
1223         /* If the disconnect has been caused by a removal of the
1224          * driver module, the reset allows reloading of the driver. If the
1225          * reset will not be executed here, the upload of the firmware in the
1226          * probe function caused by the reloading of the driver will fail.
1227          */
1228         usb_reset_device(interface_to_usbdev(intf));
1229
1230         zd_mac_clear(mac);
1231         ieee80211_free_hw(hw);
1232         dev_dbg(&intf->dev, "disconnected\n");
1233 }
1234
1235 static struct usb_driver driver = {
1236         .name           = KBUILD_MODNAME,
1237         .id_table       = usb_ids,
1238         .probe          = probe,
1239         .disconnect     = disconnect,
1240 };
1241
1242 struct workqueue_struct *zd_workqueue;
1243
1244 static int __init usb_init(void)
1245 {
1246         int r;
1247
1248         pr_debug("%s usb_init()\n", driver.name);
1249
1250         zd_workqueue = create_singlethread_workqueue(driver.name);
1251         if (zd_workqueue == NULL) {
1252                 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1253                 return -ENOMEM;
1254         }
1255
1256         r = usb_register(&driver);
1257         if (r) {
1258                 destroy_workqueue(zd_workqueue);
1259                 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1260                        driver.name, r);
1261                 return r;
1262         }
1263
1264         pr_debug("%s initialized\n", driver.name);
1265         return 0;
1266 }
1267
1268 static void __exit usb_exit(void)
1269 {
1270         pr_debug("%s usb_exit()\n", driver.name);
1271         usb_deregister(&driver);
1272         destroy_workqueue(zd_workqueue);
1273 }
1274
1275 module_init(usb_init);
1276 module_exit(usb_exit);
1277
1278 static int usb_int_regs_length(unsigned int count)
1279 {
1280         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1281 }
1282
1283 static void prepare_read_regs_int(struct zd_usb *usb)
1284 {
1285         struct zd_usb_interrupt *intr = &usb->intr;
1286
1287         spin_lock_irq(&intr->lock);
1288         intr->read_regs_enabled = 1;
1289         INIT_COMPLETION(intr->read_regs.completion);
1290         spin_unlock_irq(&intr->lock);
1291 }
1292
1293 static void disable_read_regs_int(struct zd_usb *usb)
1294 {
1295         struct zd_usb_interrupt *intr = &usb->intr;
1296
1297         spin_lock_irq(&intr->lock);
1298         intr->read_regs_enabled = 0;
1299         spin_unlock_irq(&intr->lock);
1300 }
1301
1302 static int get_results(struct zd_usb *usb, u16 *values,
1303                        struct usb_req_read_regs *req, unsigned int count)
1304 {
1305         int r;
1306         int i;
1307         struct zd_usb_interrupt *intr = &usb->intr;
1308         struct read_regs_int *rr = &intr->read_regs;
1309         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1310
1311         spin_lock_irq(&intr->lock);
1312
1313         r = -EIO;
1314         /* The created block size seems to be larger than expected.
1315          * However results appear to be correct.
1316          */
1317         if (rr->length < usb_int_regs_length(count)) {
1318                 dev_dbg_f(zd_usb_dev(usb),
1319                          "error: actual length %d less than expected %d\n",
1320                          rr->length, usb_int_regs_length(count));
1321                 goto error_unlock;
1322         }
1323         if (rr->length > sizeof(rr->buffer)) {
1324                 dev_dbg_f(zd_usb_dev(usb),
1325                          "error: actual length %d exceeds buffer size %zu\n",
1326                          rr->length, sizeof(rr->buffer));
1327                 goto error_unlock;
1328         }
1329
1330         for (i = 0; i < count; i++) {
1331                 struct reg_data *rd = &regs->regs[i];
1332                 if (rd->addr != req->addr[i]) {
1333                         dev_dbg_f(zd_usb_dev(usb),
1334                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1335                                  le16_to_cpu(rd->addr),
1336                                  le16_to_cpu(req->addr[i]));
1337                         goto error_unlock;
1338                 }
1339                 values[i] = le16_to_cpu(rd->value);
1340         }
1341
1342         r = 0;
1343 error_unlock:
1344         spin_unlock_irq(&intr->lock);
1345         return r;
1346 }
1347
1348 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1349                      const zd_addr_t *addresses, unsigned int count)
1350 {
1351         int r;
1352         int i, req_len, actual_req_len;
1353         struct usb_device *udev;
1354         struct usb_req_read_regs *req = NULL;
1355         unsigned long timeout;
1356
1357         if (count < 1) {
1358                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1359                 return -EINVAL;
1360         }
1361         if (count > USB_MAX_IOREAD16_COUNT) {
1362                 dev_dbg_f(zd_usb_dev(usb),
1363                          "error: count %u exceeds possible max %u\n",
1364                          count, USB_MAX_IOREAD16_COUNT);
1365                 return -EINVAL;
1366         }
1367         if (in_atomic()) {
1368                 dev_dbg_f(zd_usb_dev(usb),
1369                          "error: io in atomic context not supported\n");
1370                 return -EWOULDBLOCK;
1371         }
1372         if (!usb_int_enabled(usb)) {
1373                  dev_dbg_f(zd_usb_dev(usb),
1374                           "error: usb interrupt not enabled\n");
1375                 return -EWOULDBLOCK;
1376         }
1377
1378         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1379         req = kmalloc(req_len, GFP_KERNEL);
1380         if (!req)
1381                 return -ENOMEM;
1382         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1383         for (i = 0; i < count; i++)
1384                 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1385
1386         udev = zd_usb_to_usbdev(usb);
1387         prepare_read_regs_int(usb);
1388         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1389                          req, req_len, &actual_req_len, 1000 /* ms */);
1390         if (r) {
1391                 dev_dbg_f(zd_usb_dev(usb),
1392                         "error in usb_bulk_msg(). Error number %d\n", r);
1393                 goto error;
1394         }
1395         if (req_len != actual_req_len) {
1396                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1397                         " req_len %d != actual_req_len %d\n",
1398                         req_len, actual_req_len);
1399                 r = -EIO;
1400                 goto error;
1401         }
1402
1403         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1404                                               msecs_to_jiffies(1000));
1405         if (!timeout) {
1406                 disable_read_regs_int(usb);
1407                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1408                 r = -ETIMEDOUT;
1409                 goto error;
1410         }
1411
1412         r = get_results(usb, values, req, count);
1413 error:
1414         kfree(req);
1415         return r;
1416 }
1417
1418 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1419                       unsigned int count)
1420 {
1421         int r;
1422         struct usb_device *udev;
1423         struct usb_req_write_regs *req = NULL;
1424         int i, req_len, actual_req_len;
1425
1426         if (count == 0)
1427                 return 0;
1428         if (count > USB_MAX_IOWRITE16_COUNT) {
1429                 dev_dbg_f(zd_usb_dev(usb),
1430                         "error: count %u exceeds possible max %u\n",
1431                         count, USB_MAX_IOWRITE16_COUNT);
1432                 return -EINVAL;
1433         }
1434         if (in_atomic()) {
1435                 dev_dbg_f(zd_usb_dev(usb),
1436                         "error: io in atomic context not supported\n");
1437                 return -EWOULDBLOCK;
1438         }
1439
1440         req_len = sizeof(struct usb_req_write_regs) +
1441                   count * sizeof(struct reg_data);
1442         req = kmalloc(req_len, GFP_KERNEL);
1443         if (!req)
1444                 return -ENOMEM;
1445
1446         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1447         for (i = 0; i < count; i++) {
1448                 struct reg_data *rw  = &req->reg_writes[i];
1449                 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1450                 rw->value = cpu_to_le16(ioreqs[i].value);
1451         }
1452
1453         udev = zd_usb_to_usbdev(usb);
1454         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1455                          req, req_len, &actual_req_len, 1000 /* ms */);
1456         if (r) {
1457                 dev_dbg_f(zd_usb_dev(usb),
1458                         "error in usb_bulk_msg(). Error number %d\n", r);
1459                 goto error;
1460         }
1461         if (req_len != actual_req_len) {
1462                 dev_dbg_f(zd_usb_dev(usb),
1463                         "error in usb_bulk_msg()"
1464                         " req_len %d != actual_req_len %d\n",
1465                         req_len, actual_req_len);
1466                 r = -EIO;
1467                 goto error;
1468         }
1469
1470         /* FALL-THROUGH with r == 0 */
1471 error:
1472         kfree(req);
1473         return r;
1474 }
1475
1476 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1477 {
1478         int r;
1479         struct usb_device *udev;
1480         struct usb_req_rfwrite *req = NULL;
1481         int i, req_len, actual_req_len;
1482         u16 bit_value_template;
1483
1484         if (in_atomic()) {
1485                 dev_dbg_f(zd_usb_dev(usb),
1486                         "error: io in atomic context not supported\n");
1487                 return -EWOULDBLOCK;
1488         }
1489         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1490                 dev_dbg_f(zd_usb_dev(usb),
1491                         "error: bits %d are smaller than"
1492                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1493                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1494                 return -EINVAL;
1495         }
1496         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1497                 dev_dbg_f(zd_usb_dev(usb),
1498                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1499                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1500                 return -EINVAL;
1501         }
1502 #ifdef DEBUG
1503         if (value & (~0UL << bits)) {
1504                 dev_dbg_f(zd_usb_dev(usb),
1505                         "error: value %#09x has bits >= %d set\n",
1506                         value, bits);
1507                 return -EINVAL;
1508         }
1509 #endif /* DEBUG */
1510
1511         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1512
1513         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1514         if (r) {
1515                 dev_dbg_f(zd_usb_dev(usb),
1516                         "error %d: Couldn't read CR203\n", r);
1517                 goto out;
1518         }
1519         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1520
1521         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1522         req = kmalloc(req_len, GFP_KERNEL);
1523         if (!req)
1524                 return -ENOMEM;
1525
1526         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1527         /* 1: 3683a, but not used in ZYDAS driver */
1528         req->value = cpu_to_le16(2);
1529         req->bits = cpu_to_le16(bits);
1530
1531         for (i = 0; i < bits; i++) {
1532                 u16 bv = bit_value_template;
1533                 if (value & (1 << (bits-1-i)))
1534                         bv |= RF_DATA;
1535                 req->bit_values[i] = cpu_to_le16(bv);
1536         }
1537
1538         udev = zd_usb_to_usbdev(usb);
1539         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1540                          req, req_len, &actual_req_len, 1000 /* ms */);
1541         if (r) {
1542                 dev_dbg_f(zd_usb_dev(usb),
1543                         "error in usb_bulk_msg(). Error number %d\n", r);
1544                 goto out;
1545         }
1546         if (req_len != actual_req_len) {
1547                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1548                         " req_len %d != actual_req_len %d\n",
1549                         req_len, actual_req_len);
1550                 r = -EIO;
1551                 goto out;
1552         }
1553
1554         /* FALL-THROUGH with r == 0 */
1555 out:
1556         kfree(req);
1557         return r;
1558 }