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