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(0x0105, 0x145f), .driver_info = DEVICE_ZD1211 },
  40         { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
  41         { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
  42         { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
  43         { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
  44         { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
  45         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
  46         { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
  47         { USB_DEVICE(0x0ace, 0xa211), .driver_info = DEVICE_ZD1211 },
  48         { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
  49         { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
  50         { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
  51         { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
  52         { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
  53         { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
  54         { USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 },
  55         { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
  56         { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
  57         { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
  58         { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 },
  59         { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
  60         { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
  61         { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
  62         { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
  63         /* ZD1211B */
  64         { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
  65         { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
  66         { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
  67         { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
  68         { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
  69         { USB_DEVICE(0x054c, 0x0257), .driver_info = DEVICE_ZD1211B },
  70         { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
  71         { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
  72         { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
  73         { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
  74         { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
  75         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  76         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211B },
  77         { USB_DEVICE(0x07fa, 0x1196), .driver_info = DEVICE_ZD1211B },
  78         { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
  79         { USB_DEVICE(0x083a, 0xe501), .driver_info = DEVICE_ZD1211B },
  80         { USB_DEVICE(0x083a, 0xe503), .driver_info = DEVICE_ZD1211B },
  81         { USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B },
  82         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  83         { USB_DEVICE(0x0ace, 0xb215), .driver_info = DEVICE_ZD1211B },
  84         { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
  85         { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
  86         { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
  87         { USB_DEVICE(0x0df6, 0x0036), .driver_info = DEVICE_ZD1211B },
  88         { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
  89         { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
  90         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  91         { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
  92         { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
  93         /* "Driverless" devices that need ejecting */
  94         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
  95         { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
  96         {}
  97 };
  98
  99 MODULE_LICENSE("GPL");
 100 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
 101 MODULE_AUTHOR("Ulrich Kunitz");
 102 MODULE_AUTHOR("Daniel Drake");
 103 MODULE_VERSION("1.0");
 104 MODULE_DEVICE_TABLE(usb, usb_ids);
 105
 106 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
 107 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
 108
 109 /* USB device initialization */
 110 static void int_urb_complete(struct urb *urb);
 111
 112 static int request_fw_file(
 113         const struct firmware **fw, const char *name, struct device *device)
 114 {
 115         int r;
 116
 117         dev_dbg_f(device, "fw name %s\n", name);
 118
 119         r = request_firmware(fw, name, device);
 120         if (r)
 121                 dev_err(device,
 122                        "Could not load firmware file %s. Error number %d\n",
 123                        name, r);
 124         return r;
 125 }
 126
 127 static inline u16 get_bcdDevice(const struct usb_device *udev)
 128 {
 129         return le16_to_cpu(udev->descriptor.bcdDevice);
 130 }
 131
 132 enum upload_code_flags {
 133         REBOOT = 1,
 134 };
 135
 136 /* Ensures that MAX_TRANSFER_SIZE is even. */
 137 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 138
 139 static int upload_code(struct usb_device *udev,
 140         const u8 *data, size_t size, u16 code_offset, int flags)
 141 {
 142         u8 *p;
 143         int r;
 144
 145         /* USB request blocks need "kmalloced" buffers.
 146          */
 147         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 148         if (!p) {
 149                 dev_err(&udev->dev, "out of memory\n");
 150                 r = -ENOMEM;
 151                 goto error;
 152         }
 153
 154         size &= ~1;
 155         while (size > 0) {
 156                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 157                         size : MAX_TRANSFER_SIZE;
 158
 159                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 160
 161                 memcpy(p, data, transfer_size);
 162                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 163                         USB_REQ_FIRMWARE_DOWNLOAD,
 164                         USB_DIR_OUT | USB_TYPE_VENDOR,
 165                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 166                 if (r < 0) {
 167                         dev_err(&udev->dev,
 168                                "USB control request for firmware upload"
 169                                " failed. Error number %d\n", r);
 170                         goto error;
 171                 }
 172                 transfer_size = r & ~1;
 173
 174                 size -= transfer_size;
 175                 data += transfer_size;
 176                 code_offset += transfer_size/sizeof(u16);
 177         }
 178
 179         if (flags & REBOOT) {
 180                 u8 ret;
 181
 182                 /* Use "DMA-aware" buffer. */
 183                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 184                         USB_REQ_FIRMWARE_CONFIRM,
 185                         USB_DIR_IN | USB_TYPE_VENDOR,
 186                         0, 0, p, sizeof(ret), 5000 /* ms */);
 187                 if (r != sizeof(ret)) {
 188                         dev_err(&udev->dev,
 189                                 "control request firmeware confirmation failed."
 190                                 " Return value %d\n", r);
 191                         if (r >= 0)
 192                                 r = -ENODEV;
 193                         goto error;
 194                 }
 195                 ret = p[0];
 196                 if (ret & 0x80) {
 197                         dev_err(&udev->dev,
 198                                 "Internal error while downloading."
 199                                 " Firmware confirm return value %#04x\n",
 200                                 (unsigned int)ret);
 201                         r = -ENODEV;
 202                         goto error;
 203                 }
 204                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 205                         (unsigned int)ret);
 206         }
 207
 208         r = 0;
 209 error:
 210         kfree(p);
 211         return r;
 212 }
 213
 214 static u16 get_word(const void *data, u16 offset)
 215 {
 216         const __le16 *p = data;
 217         return le16_to_cpu(p[offset]);
 218 }
 219
 220 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
 221                        const char* postfix)
 222 {
 223         scnprintf(buffer, size, "%s%s",
 224                 usb->is_zd1211b ?
 225                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 226                 postfix);
 227         return buffer;
 228 }
 229
 230 static int handle_version_mismatch(struct zd_usb *usb,
 231         const struct firmware *ub_fw)
 232 {
 233         struct usb_device *udev = zd_usb_to_usbdev(usb);
 234         const struct firmware *ur_fw = NULL;
 235         int offset;
 236         int r = 0;
 237         char fw_name[128];
 238
 239         r = request_fw_file(&ur_fw,
 240                 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
 241                 &udev->dev);
 242         if (r)
 243                 goto error;
 244
 245         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
 246         if (r)
 247                 goto error;
 248
 249         offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
 250         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
 251                 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
 252
 253         /* At this point, the vendor driver downloads the whole firmware
 254          * image, hacks around with version IDs, and uploads it again,
 255          * completely overwriting the boot code. We do not do this here as
 256          * it is not required on any tested devices, and it is suspected to
 257          * cause problems. */
 258 error:
 259         release_firmware(ur_fw);
 260         return r;
 261 }
 262
 263 static int upload_firmware(struct zd_usb *usb)
 264 {
 265         int r;
 266         u16 fw_bcdDevice;
 267         u16 bcdDevice;
 268         struct usb_device *udev = zd_usb_to_usbdev(usb);
 269         const struct firmware *ub_fw = NULL;
 270         const struct firmware *uph_fw = NULL;
 271         char fw_name[128];
 272
 273         bcdDevice = get_bcdDevice(udev);
 274
 275         r = request_fw_file(&ub_fw,
 276                 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
 277                 &udev->dev);
 278         if (r)
 279                 goto error;
 280
 281         fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
 282
 283         if (fw_bcdDevice != bcdDevice) {
 284                 dev_info(&udev->dev,
 285                         "firmware version %#06x and device bootcode version "
 286                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
 287                 if (bcdDevice <= 0x4313)
 288                         dev_warn(&udev->dev, "device has old bootcode, please "
 289                                 "report success or failure\n");
 290
 291                 r = handle_version_mismatch(usb, ub_fw);
 292                 if (r)
 293                         goto error;
 294         } else {
 295                 dev_dbg_f(&udev->dev,
 296                         "firmware device id %#06x is equal to the "
 297                         "actual device id\n", fw_bcdDevice);
 298         }
 299
 300
 301         r = request_fw_file(&uph_fw,
 302                 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
 303                 &udev->dev);
 304         if (r)
 305                 goto error;
 306
 307         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
 308         if (r) {
 309                 dev_err(&udev->dev,
 310                         "Could not upload firmware code uph. Error number %d\n",
 311                         r);
 312         }
 313
 314         /* FALL-THROUGH */
 315 error:
 316         release_firmware(ub_fw);
 317         release_firmware(uph_fw);
 318         return r;
 319 }
 320
 321 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ur");
 322 MODULE_FIRMWARE(FW_ZD1211_PREFIX "ur");
 323 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ub");
 324 MODULE_FIRMWARE(FW_ZD1211_PREFIX "ub");
 325 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "uphr");
 326 MODULE_FIRMWARE(FW_ZD1211_PREFIX "uphr");
 327
 328 /* Read data from device address space using "firmware interface" which does
 329  * not require firmware to be loaded. */
 330 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
 331 {
 332         int r;
 333         struct usb_device *udev = zd_usb_to_usbdev(usb);
 334         u8 *buf;
 335
 336         /* Use "DMA-aware" buffer. */
 337         buf = kmalloc(len, GFP_KERNEL);
 338         if (!buf)
 339                 return -ENOMEM;
 340         r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 341                 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
 342                 buf, len, 5000);
 343         if (r < 0) {
 344                 dev_err(&udev->dev,
 345                         "read over firmware interface failed: %d\n", r);
 346                 goto exit;
 347         } else if (r != len) {
 348                 dev_err(&udev->dev,
 349                         "incomplete read over firmware interface: %d/%d\n",
 350                         r, len);
 351                 r = -EIO;
 352                 goto exit;
 353         }
 354         r = 0;
 355         memcpy(data, buf, len);
 356 exit:
 357         kfree(buf);
 358         return r;
 359 }
 360
 361 #define urb_dev(urb) (&(urb)->dev->dev)
 362
 363 static inline void handle_regs_int(struct urb *urb)
 364 {
 365         struct zd_usb *usb = urb->context;
 366         struct zd_usb_interrupt *intr = &usb->intr;
 367         int len;
 368         u16 int_num;
 369
 370         ZD_ASSERT(in_interrupt());
 371         spin_lock(&intr->lock);
 372
 373         int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));
 374         if (int_num == CR_INTERRUPT) {
 375                 struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
 376                 memcpy(&mac->intr_buffer, urb->transfer_buffer,
 377                                 USB_MAX_EP_INT_BUFFER);
 378                 schedule_work(&mac->process_intr);
 379         } else if (intr->read_regs_enabled) {
 380                 intr->read_regs.length = len = urb->actual_length;
 381
 382                 if (len > sizeof(intr->read_regs.buffer))
 383                         len = sizeof(intr->read_regs.buffer);
 384                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 385                 intr->read_regs_enabled = 0;
 386                 complete(&intr->read_regs.completion);
 387                 goto out;
 388         }
 389
 390 out:
 391         spin_unlock(&intr->lock);
 392 }
 393
 394 static void int_urb_complete(struct urb *urb)
 395 {
 396         int r;
 397         struct usb_int_header *hdr;
 398
 399         switch (urb->status) {
 400         case 0:
 401                 break;
 402         case -ESHUTDOWN:
 403         case -EINVAL:
 404         case -ENODEV:
 405         case -ENOENT:
 406         case -ECONNRESET:
 407         case -EPIPE:
 408                 goto kfree;
 409         default:
 410                 goto resubmit;
 411         }
 412
 413         if (urb->actual_length < sizeof(hdr)) {
 414                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 415                 goto resubmit;
 416         }
 417
 418         hdr = urb->transfer_buffer;
 419         if (hdr->type != USB_INT_TYPE) {
 420                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 421                 goto resubmit;
 422         }
 423
 424         switch (hdr->id) {
 425         case USB_INT_ID_REGS:
 426                 handle_regs_int(urb);
 427                 break;
 428         case USB_INT_ID_RETRY_FAILED:
 429                 zd_mac_tx_failed(urb);
 430                 break;
 431         default:
 432                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 433                         (unsigned int)hdr->id);
 434                 goto resubmit;
 435         }
 436
 437 resubmit:
 438         r = usb_submit_urb(urb, GFP_ATOMIC);
 439         if (r) {
 440                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
 441                 goto kfree;
 442         }
 443         return;
 444 kfree:
 445         kfree(urb->transfer_buffer);
 446 }
 447
 448 static inline int int_urb_interval(struct usb_device *udev)
 449 {
 450         switch (udev->speed) {
 451         case USB_SPEED_HIGH:
 452                 return 4;
 453         case USB_SPEED_LOW:
 454                 return 10;
 455         case USB_SPEED_FULL:
 456         default:
 457                 return 1;
 458         }
 459 }
 460
 461 static inline int usb_int_enabled(struct zd_usb *usb)
 462 {
 463         unsigned long flags;
 464         struct zd_usb_interrupt *intr = &usb->intr;
 465         struct urb *urb;
 466
 467         spin_lock_irqsave(&intr->lock, flags);
 468         urb = intr->urb;
 469         spin_unlock_irqrestore(&intr->lock, flags);
 470         return urb != NULL;
 471 }
 472
 473 int zd_usb_enable_int(struct zd_usb *usb)
 474 {
 475         int r;
 476         struct usb_device *udev;
 477         struct zd_usb_interrupt *intr = &usb->intr;
 478         void *transfer_buffer = NULL;
 479         struct urb *urb;
 480
 481         dev_dbg_f(zd_usb_dev(usb), "\n");
 482
 483         urb = usb_alloc_urb(0, GFP_KERNEL);
 484         if (!urb) {
 485                 r = -ENOMEM;
 486                 goto out;
 487         }
 488
 489         ZD_ASSERT(!irqs_disabled());
 490         spin_lock_irq(&intr->lock);
 491         if (intr->urb) {
 492                 spin_unlock_irq(&intr->lock);
 493                 r = 0;
 494                 goto error_free_urb;
 495         }
 496         intr->urb = urb;
 497         spin_unlock_irq(&intr->lock);
 498
 499         /* TODO: make it a DMA buffer */
 500         r = -ENOMEM;
 501         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
 502         if (!transfer_buffer) {
 503                 dev_dbg_f(zd_usb_dev(usb),
 504                         "couldn't allocate transfer_buffer\n");
 505                 goto error_set_urb_null;
 506         }
 507
 508         udev = zd_usb_to_usbdev(usb);
 509         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 510                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
 511                          int_urb_complete, usb,
 512                          intr->interval);
 513
 514         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 515         r = usb_submit_urb(urb, GFP_KERNEL);
 516         if (r) {
 517                 dev_dbg_f(zd_usb_dev(usb),
 518                          "Couldn't submit urb. Error number %d\n", r);
 519                 goto error;
 520         }
 521
 522         return 0;
 523 error:
 524         kfree(transfer_buffer);
 525 error_set_urb_null:
 526         spin_lock_irq(&intr->lock);
 527         intr->urb = NULL;
 528         spin_unlock_irq(&intr->lock);
 529 error_free_urb:
 530         usb_free_urb(urb);
 531 out:
 532         return r;
 533 }
 534
 535 void zd_usb_disable_int(struct zd_usb *usb)
 536 {
 537         unsigned long flags;
 538         struct zd_usb_interrupt *intr = &usb->intr;
 539         struct urb *urb;
 540
 541         spin_lock_irqsave(&intr->lock, flags);
 542         urb = intr->urb;
 543         if (!urb) {
 544                 spin_unlock_irqrestore(&intr->lock, flags);
 545                 return;
 546         }
 547         intr->urb = NULL;
 548         spin_unlock_irqrestore(&intr->lock, flags);
 549
 550         usb_kill_urb(urb);
 551         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 552         usb_free_urb(urb);
 553 }
 554
 555 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 556                              unsigned int length)
 557 {
 558         int i;
 559         const struct rx_length_info *length_info;
 560
 561         if (length < sizeof(struct rx_length_info)) {
 562                 /* It's not a complete packet anyhow. */
 563                 printk("%s: invalid, small RX packet : %d\n",
 564                        __func__, length);
 565                 return;
 566         }
 567         length_info = (struct rx_length_info *)
 568                 (buffer + length - sizeof(struct rx_length_info));
 569
 570         /* It might be that three frames are merged into a single URB
 571          * transaction. We have to check for the length info tag.
 572          *
 573          * While testing we discovered that length_info might be unaligned,
 574          * because if USB transactions are merged, the last packet will not
 575          * be padded. Unaligned access might also happen if the length_info
 576          * structure is not present.
 577          */
 578         if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG)
 579         {
 580                 unsigned int l, k, n;
 581                 for (i = 0, l = 0;; i++) {
 582                         k = get_unaligned_le16(&length_info->length[i]);
 583                         if (k == 0)
 584                                 return;
 585                         n = l+k;
 586                         if (n > length)
 587                                 return;
 588                         zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
 589                         if (i >= 2)
 590                                 return;
 591                         l = (n+3) & ~3;
 592                 }
 593         } else {
 594                 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
 595         }
 596 }
 597
 598 static void rx_urb_complete(struct urb *urb)
 599 {
 600         struct zd_usb *usb;
 601         struct zd_usb_rx *rx;
 602         const u8 *buffer;
 603         unsigned int length;
 604
 605         switch (urb->status) {
 606         case 0:
 607                 break;
 608         case -ESHUTDOWN:
 609         case -EINVAL:
 610         case -ENODEV:
 611         case -ENOENT:
 612         case -ECONNRESET:
 613         case -EPIPE:
 614                 return;
 615         default:
 616                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 617                 goto resubmit;
 618         }
 619
 620         buffer = urb->transfer_buffer;
 621         length = urb->actual_length;
 622         usb = urb->context;
 623         rx = &usb->rx;
 624
 625         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 626                 /* If there is an old first fragment, we don't care. */
 627                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 628                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 629                 spin_lock(&rx->lock);
 630                 memcpy(rx->fragment, buffer, length);
 631                 rx->fragment_length = length;
 632                 spin_unlock(&rx->lock);
 633                 goto resubmit;
 634         }
 635
 636         spin_lock(&rx->lock);
 637         if (rx->fragment_length > 0) {
 638                 /* We are on a second fragment, we believe */
 639                 ZD_ASSERT(length + rx->fragment_length <=
 640                           ARRAY_SIZE(rx->fragment));
 641                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 642                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 643                 handle_rx_packet(usb, rx->fragment,
 644                                  rx->fragment_length + length);
 645                 rx->fragment_length = 0;
 646                 spin_unlock(&rx->lock);
 647         } else {
 648                 spin_unlock(&rx->lock);
 649                 handle_rx_packet(usb, buffer, length);
 650         }
 651
 652 resubmit:
 653         usb_submit_urb(urb, GFP_ATOMIC);
 654 }
 655
 656 static struct urb *alloc_rx_urb(struct zd_usb *usb)
 657 {
 658         struct usb_device *udev = zd_usb_to_usbdev(usb);
 659         struct urb *urb;
 660         void *buffer;
 661
 662         urb = usb_alloc_urb(0, GFP_KERNEL);
 663         if (!urb)
 664                 return NULL;
 665         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
 666                                   &urb->transfer_dma);
 667         if (!buffer) {
 668                 usb_free_urb(urb);
 669                 return NULL;
 670         }
 671
 672         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 673                           buffer, USB_MAX_RX_SIZE,
 674                           rx_urb_complete, usb);
 675         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 676
 677         return urb;
 678 }
 679
 680 static void free_rx_urb(struct urb *urb)
 681 {
 682         if (!urb)
 683                 return;
 684         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 685                         urb->transfer_buffer, urb->transfer_dma);
 686         usb_free_urb(urb);
 687 }
 688
 689 int zd_usb_enable_rx(struct zd_usb *usb)
 690 {
 691         int i, r;
 692         struct zd_usb_rx *rx = &usb->rx;
 693         struct urb **urbs;
 694
 695         dev_dbg_f(zd_usb_dev(usb), "\n");
 696
 697         r = -ENOMEM;
 698         urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
 699         if (!urbs)
 700                 goto error;
 701         for (i = 0; i < RX_URBS_COUNT; i++) {
 702                 urbs[i] = alloc_rx_urb(usb);
 703                 if (!urbs[i])
 704                         goto error;
 705         }
 706
 707         ZD_ASSERT(!irqs_disabled());
 708         spin_lock_irq(&rx->lock);
 709         if (rx->urbs) {
 710                 spin_unlock_irq(&rx->lock);
 711                 r = 0;
 712                 goto error;
 713         }
 714         rx->urbs = urbs;
 715         rx->urbs_count = RX_URBS_COUNT;
 716         spin_unlock_irq(&rx->lock);
 717
 718         for (i = 0; i < RX_URBS_COUNT; i++) {
 719                 r = usb_submit_urb(urbs[i], GFP_KERNEL);
 720                 if (r)
 721                         goto error_submit;
 722         }
 723
 724         return 0;
 725 error_submit:
 726         for (i = 0; i < RX_URBS_COUNT; i++) {
 727                 usb_kill_urb(urbs[i]);
 728         }
 729         spin_lock_irq(&rx->lock);
 730         rx->urbs = NULL;
 731         rx->urbs_count = 0;
 732         spin_unlock_irq(&rx->lock);
 733 error:
 734         if (urbs) {
 735                 for (i = 0; i < RX_URBS_COUNT; i++)
 736                         free_rx_urb(urbs[i]);
 737         }
 738         return r;
 739 }
 740
 741 void zd_usb_disable_rx(struct zd_usb *usb)
 742 {
 743         int i;
 744         unsigned long flags;
 745         struct urb **urbs;
 746         unsigned int count;
 747         struct zd_usb_rx *rx = &usb->rx;
 748
 749         spin_lock_irqsave(&rx->lock, flags);
 750         urbs = rx->urbs;
 751         count = rx->urbs_count;
 752         spin_unlock_irqrestore(&rx->lock, flags);
 753         if (!urbs)
 754                 return;
 755
 756         for (i = 0; i < count; i++) {
 757                 usb_kill_urb(urbs[i]);
 758                 free_rx_urb(urbs[i]);
 759         }
 760         kfree(urbs);
 761
 762         spin_lock_irqsave(&rx->lock, flags);
 763         rx->urbs = NULL;
 764         rx->urbs_count = 0;
 765         spin_unlock_irqrestore(&rx->lock, flags);
 766 }
 767
 768 /**
 769  * zd_usb_disable_tx - disable transmission
 770  * @usb: the zd1211rw-private USB structure
 771  *
 772  * Frees all URBs in the free list and marks the transmission as disabled.
 773  */
 774 void zd_usb_disable_tx(struct zd_usb *usb)
 775 {
 776         struct zd_usb_tx *tx = &usb->tx;
 777         unsigned long flags;
 778         struct list_head *pos, *n;
 779
 780         spin_lock_irqsave(&tx->lock, flags);
 781         list_for_each_safe(pos, n, &tx->free_urb_list) {
 782                 list_del(pos);
 783                 usb_free_urb(list_entry(pos, struct urb, urb_list));
 784         }
 785         tx->enabled = 0;
 786         tx->submitted_urbs = 0;
 787         /* The stopped state is ignored, relying on ieee80211_wake_queues()
 788          * in a potentionally following zd_usb_enable_tx().
 789          */
 790         spin_unlock_irqrestore(&tx->lock, flags);
 791 }
 792
 793 /**
 794  * zd_usb_enable_tx - enables transmission
 795  * @usb: a &struct zd_usb pointer
 796  *
 797  * This function enables transmission and prepares the &zd_usb_tx data
 798  * structure.
 799  */
 800 void zd_usb_enable_tx(struct zd_usb *usb)
 801 {
 802         unsigned long flags;
 803         struct zd_usb_tx *tx = &usb->tx;
 804
 805         spin_lock_irqsave(&tx->lock, flags);
 806         tx->enabled = 1;
 807         tx->submitted_urbs = 0;
 808         ieee80211_wake_queues(zd_usb_to_hw(usb));
 809         tx->stopped = 0;
 810         spin_unlock_irqrestore(&tx->lock, flags);
 811 }
 812
 813 /**
 814  * alloc_tx_urb - provides an tx URB
 815  * @usb: a &struct zd_usb pointer
 816  *
 817  * Allocates a new URB. If possible takes the urb from the free list in
 818  * usb->tx.
 819  */
 820 static struct urb *alloc_tx_urb(struct zd_usb *usb)
 821 {
 822         struct zd_usb_tx *tx = &usb->tx;
 823         unsigned long flags;
 824         struct list_head *entry;
 825         struct urb *urb;
 826
 827         spin_lock_irqsave(&tx->lock, flags);
 828         if (list_empty(&tx->free_urb_list)) {
 829                 urb = usb_alloc_urb(0, GFP_ATOMIC);
 830                 goto out;
 831         }
 832         entry = tx->free_urb_list.next;
 833         list_del(entry);
 834         urb = list_entry(entry, struct urb, urb_list);
 835 out:
 836         spin_unlock_irqrestore(&tx->lock, flags);
 837         return urb;
 838 }
 839
 840 /**
 841  * free_tx_urb - frees a used tx URB
 842  * @usb: a &struct zd_usb pointer
 843  * @urb: URB to be freed
 844  *
 845  * Frees the the transmission URB, which means to put it on the free URB
 846  * list.
 847  */
 848 static void free_tx_urb(struct zd_usb *usb, struct urb *urb)
 849 {
 850         struct zd_usb_tx *tx = &usb->tx;
 851         unsigned long flags;
 852
 853         spin_lock_irqsave(&tx->lock, flags);
 854         if (!tx->enabled) {
 855                 usb_free_urb(urb);
 856                 goto out;
 857         }
 858         list_add(&urb->urb_list, &tx->free_urb_list);
 859 out:
 860         spin_unlock_irqrestore(&tx->lock, flags);
 861 }
 862
 863 static void tx_dec_submitted_urbs(struct zd_usb *usb)
 864 {
 865         struct zd_usb_tx *tx = &usb->tx;
 866         unsigned long flags;
 867
 868         spin_lock_irqsave(&tx->lock, flags);
 869         --tx->submitted_urbs;
 870         if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) {
 871                 ieee80211_wake_queues(zd_usb_to_hw(usb));
 872                 tx->stopped = 0;
 873         }
 874         spin_unlock_irqrestore(&tx->lock, flags);
 875 }
 876
 877 static void tx_inc_submitted_urbs(struct zd_usb *usb)
 878 {
 879         struct zd_usb_tx *tx = &usb->tx;
 880         unsigned long flags;
 881
 882         spin_lock_irqsave(&tx->lock, flags);
 883         ++tx->submitted_urbs;
 884         if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
 885                 ieee80211_stop_queues(zd_usb_to_hw(usb));
 886                 tx->stopped = 1;
 887         }
 888         spin_unlock_irqrestore(&tx->lock, flags);
 889 }
 890
 891 /**
 892  * tx_urb_complete - completes the execution of an URB
 893  * @urb: a URB
 894  *
 895  * This function is called if the URB has been transferred to a device or an
 896  * error has happened.
 897  */
 898 static void tx_urb_complete(struct urb *urb)
 899 {
 900         int r;
 901         struct sk_buff *skb;
 902         struct ieee80211_tx_info *info;
 903         struct zd_usb *usb;
 904
 905         switch (urb->status) {
 906         case 0:
 907                 break;
 908         case -ESHUTDOWN:
 909         case -EINVAL:
 910         case -ENODEV:
 911         case -ENOENT:
 912         case -ECONNRESET:
 913         case -EPIPE:
 914                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 915                 break;
 916         default:
 917                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 918                 goto resubmit;
 919         }
 920 free_urb:
 921         skb = (struct sk_buff *)urb->context;
 922         /*
 923          * grab 'usb' pointer before handing off the skb (since
 924          * it might be freed by zd_mac_tx_to_dev or mac80211)
 925          */
 926         info = IEEE80211_SKB_CB(skb);
 927         usb = &zd_hw_mac(info->rate_driver_data[0])->chip.usb;
 928         zd_mac_tx_to_dev(skb, urb->status);
 929         free_tx_urb(usb, urb);
 930         tx_dec_submitted_urbs(usb);
 931         return;
 932 resubmit:
 933         r = usb_submit_urb(urb, GFP_ATOMIC);
 934         if (r) {
 935                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 936                 goto free_urb;
 937         }
 938 }
 939
 940 /**
 941  * zd_usb_tx: initiates transfer of a frame of the device
 942  *
 943  * @usb: the zd1211rw-private USB structure
 944  * @skb: a &struct sk_buff pointer
 945  *
 946  * This function tranmits a frame to the device. It doesn't wait for
 947  * completion. The frame must contain the control set and have all the
 948  * control set information available.
 949  *
 950  * The function returns 0 if the transfer has been successfully initiated.
 951  */
 952 int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
 953 {
 954         int r;
 955         struct usb_device *udev = zd_usb_to_usbdev(usb);
 956         struct urb *urb;
 957
 958         urb = alloc_tx_urb(usb);
 959         if (!urb) {
 960                 r = -ENOMEM;
 961                 goto out;
 962         }
 963
 964         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 965                           skb->data, skb->len, tx_urb_complete, skb);
 966
 967         r = usb_submit_urb(urb, GFP_ATOMIC);
 968         if (r)
 969                 goto error;
 970         tx_inc_submitted_urbs(usb);
 971         return 0;
 972 error:
 973         free_tx_urb(usb, urb);
 974 out:
 975         return r;
 976 }
 977
 978 static inline void init_usb_interrupt(struct zd_usb *usb)
 979 {
 980         struct zd_usb_interrupt *intr = &usb->intr;
 981
 982         spin_lock_init(&intr->lock);
 983         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 984         init_completion(&intr->read_regs.completion);
 985         intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
 986 }
 987
 988 static inline void init_usb_rx(struct zd_usb *usb)
 989 {
 990         struct zd_usb_rx *rx = &usb->rx;
 991         spin_lock_init(&rx->lock);
 992         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 993                 rx->usb_packet_size = 512;
 994         } else {
 995                 rx->usb_packet_size = 64;
 996         }
 997         ZD_ASSERT(rx->fragment_length == 0);
 998 }
 999
1000 static inline void init_usb_tx(struct zd_usb *usb)
1001 {
1002         struct zd_usb_tx *tx = &usb->tx;
1003         spin_lock_init(&tx->lock);
1004         tx->enabled = 0;
1005         tx->stopped = 0;
1006         INIT_LIST_HEAD(&tx->free_urb_list);
1007         tx->submitted_urbs = 0;
1008 }
1009
1010 void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
1011                  struct usb_interface *intf)
1012 {
1013         memset(usb, 0, sizeof(*usb));
1014         usb->intf = usb_get_intf(intf);
1015         usb_set_intfdata(usb->intf, hw);
1016         init_usb_interrupt(usb);
1017         init_usb_tx(usb);
1018         init_usb_rx(usb);
1019 }
1020
1021 void zd_usb_clear(struct zd_usb *usb)
1022 {
1023         usb_set_intfdata(usb->intf, NULL);
1024         usb_put_intf(usb->intf);
1025         ZD_MEMCLEAR(usb, sizeof(*usb));
1026         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
1027 }
1028
1029 static const char *speed(enum usb_device_speed speed)
1030 {
1031         switch (speed) {
1032         case USB_SPEED_LOW:
1033                 return "low";
1034         case USB_SPEED_FULL:
1035                 return "full";
1036         case USB_SPEED_HIGH:
1037                 return "high";
1038         default:
1039                 return "unknown speed";
1040         }
1041 }
1042
1043 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
1044 {
1045         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1046                 le16_to_cpu(udev->descriptor.idVendor),
1047                 le16_to_cpu(udev->descriptor.idProduct),
1048                 get_bcdDevice(udev),
1049                 speed(udev->speed));
1050 }
1051
1052 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1053 {
1054         struct usb_device *udev = interface_to_usbdev(usb->intf);
1055         return scnprint_id(udev, buffer, size);
1056 }
1057
1058 #ifdef DEBUG
1059 static void print_id(struct usb_device *udev)
1060 {
1061         char buffer[40];
1062
1063         scnprint_id(udev, buffer, sizeof(buffer));
1064         buffer[sizeof(buffer)-1] = 0;
1065         dev_dbg_f(&udev->dev, "%s\n", buffer);
1066 }
1067 #else
1068 #define print_id(udev) do { } while (0)
1069 #endif
1070
1071 static int eject_installer(struct usb_interface *intf)
1072 {
1073         struct usb_device *udev = interface_to_usbdev(intf);
1074         struct usb_host_interface *iface_desc = &intf->altsetting[0];
1075         struct usb_endpoint_descriptor *endpoint;
1076         unsigned char *cmd;
1077         u8 bulk_out_ep;
1078         int r;
1079
1080         /* Find bulk out endpoint */
1081         endpoint = &iface_desc->endpoint[1].desc;
1082         if (usb_endpoint_dir_out(endpoint) &&
1083             usb_endpoint_xfer_bulk(endpoint)) {
1084                 bulk_out_ep = endpoint->bEndpointAddress;
1085         } else {
1086                 dev_err(&udev->dev,
1087                         "zd1211rw: Could not find bulk out endpoint\n");
1088                 return -ENODEV;
1089         }
1090
1091         cmd = kzalloc(31, GFP_KERNEL);
1092         if (cmd == NULL)
1093                 return -ENODEV;
1094
1095         /* USB bulk command block */
1096         cmd[0] = 0x55;  /* bulk command signature */
1097         cmd[1] = 0x53;  /* bulk command signature */
1098         cmd[2] = 0x42;  /* bulk command signature */
1099         cmd[3] = 0x43;  /* bulk command signature */
1100         cmd[14] = 6;    /* command length */
1101
1102         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1103         cmd[19] = 0x2;  /* eject disc */
1104
1105         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1106         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1107                 cmd, 31, NULL, 2000);
1108         kfree(cmd);
1109         if (r)
1110                 return r;
1111
1112         /* At this point, the device disconnects and reconnects with the real
1113          * ID numbers. */
1114
1115         usb_set_intfdata(intf, NULL);
1116         return 0;
1117 }
1118
1119 int zd_usb_init_hw(struct zd_usb *usb)
1120 {
1121         int r;
1122         struct zd_mac *mac = zd_usb_to_mac(usb);
1123
1124         dev_dbg_f(zd_usb_dev(usb), "\n");
1125
1126         r = upload_firmware(usb);
1127         if (r) {
1128                 dev_err(zd_usb_dev(usb),
1129                        "couldn't load firmware. Error number %d\n", r);
1130                 return r;
1131         }
1132
1133         r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1134         if (r) {
1135                 dev_dbg_f(zd_usb_dev(usb),
1136                         "couldn't reset configuration. Error number %d\n", r);
1137                 return r;
1138         }
1139
1140         r = zd_mac_init_hw(mac->hw);
1141         if (r) {
1142                 dev_dbg_f(zd_usb_dev(usb),
1143                          "couldn't initialize mac. Error number %d\n", r);
1144                 return r;
1145         }
1146
1147         usb->initialized = 1;
1148         return 0;
1149 }
1150
1151 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1152 {
1153         int r;
1154         struct usb_device *udev = interface_to_usbdev(intf);
1155         struct zd_usb *usb;
1156         struct ieee80211_hw *hw = NULL;
1157
1158         print_id(udev);
1159
1160         if (id->driver_info & DEVICE_INSTALLER)
1161                 return eject_installer(intf);
1162
1163         switch (udev->speed) {
1164         case USB_SPEED_LOW:
1165         case USB_SPEED_FULL:
1166         case USB_SPEED_HIGH:
1167                 break;
1168         default:
1169                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1170                 r = -ENODEV;
1171                 goto error;
1172         }
1173
1174         r = usb_reset_device(udev);
1175         if (r) {
1176                 dev_err(&intf->dev,
1177                         "couldn't reset usb device. Error number %d\n", r);
1178                 goto error;
1179         }
1180
1181         hw = zd_mac_alloc_hw(intf);
1182         if (hw == NULL) {
1183                 r = -ENOMEM;
1184                 goto error;
1185         }
1186
1187         usb = &zd_hw_mac(hw)->chip.usb;
1188         usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1189
1190         r = zd_mac_preinit_hw(hw);
1191         if (r) {
1192                 dev_dbg_f(&intf->dev,
1193                          "couldn't initialize mac. Error number %d\n", r);
1194                 goto error;
1195         }
1196
1197         r = ieee80211_register_hw(hw);
1198         if (r) {
1199                 dev_dbg_f(&intf->dev,
1200                          "couldn't register device. Error number %d\n", r);
1201                 goto error;
1202         }
1203
1204         dev_dbg_f(&intf->dev, "successful\n");
1205         dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
1206         return 0;
1207 error:
1208         usb_reset_device(interface_to_usbdev(intf));
1209         if (hw) {
1210                 zd_mac_clear(zd_hw_mac(hw));
1211                 ieee80211_free_hw(hw);
1212         }
1213         return r;
1214 }
1215
1216 static void disconnect(struct usb_interface *intf)
1217 {
1218         struct ieee80211_hw *hw = zd_intf_to_hw(intf);
1219         struct zd_mac *mac;
1220         struct zd_usb *usb;
1221
1222         /* Either something really bad happened, or we're just dealing with
1223          * a DEVICE_INSTALLER. */
1224         if (hw == NULL)
1225                 return;
1226
1227         mac = zd_hw_mac(hw);
1228         usb = &mac->chip.usb;
1229
1230         dev_dbg_f(zd_usb_dev(usb), "\n");
1231
1232         ieee80211_unregister_hw(hw);
1233
1234         /* Just in case something has gone wrong! */
1235         zd_usb_disable_rx(usb);
1236         zd_usb_disable_int(usb);
1237
1238         /* If the disconnect has been caused by a removal of the
1239          * driver module, the reset allows reloading of the driver. If the
1240          * reset will not be executed here, the upload of the firmware in the
1241          * probe function caused by the reloading of the driver will fail.
1242          */
1243         usb_reset_device(interface_to_usbdev(intf));
1244
1245         zd_mac_clear(mac);
1246         ieee80211_free_hw(hw);
1247         dev_dbg(&intf->dev, "disconnected\n");
1248 }
1249
1250 static struct usb_driver driver = {
1251         .name           = KBUILD_MODNAME,
1252         .id_table       = usb_ids,
1253         .probe          = probe,
1254         .disconnect     = disconnect,
1255 };
1256
1257 struct workqueue_struct *zd_workqueue;
1258
1259 static int __init usb_init(void)
1260 {
1261         int r;
1262
1263         pr_debug("%s usb_init()\n", driver.name);
1264
1265         zd_workqueue = create_singlethread_workqueue(driver.name);
1266         if (zd_workqueue == NULL) {
1267                 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1268                 return -ENOMEM;
1269         }
1270
1271         r = usb_register(&driver);
1272         if (r) {
1273                 destroy_workqueue(zd_workqueue);
1274                 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1275                        driver.name, r);
1276                 return r;
1277         }
1278
1279         pr_debug("%s initialized\n", driver.name);
1280         return 0;
1281 }
1282
1283 static void __exit usb_exit(void)
1284 {
1285         pr_debug("%s usb_exit()\n", driver.name);
1286         usb_deregister(&driver);
1287         destroy_workqueue(zd_workqueue);
1288 }
1289
1290 module_init(usb_init);
1291 module_exit(usb_exit);
1292
1293 static int usb_int_regs_length(unsigned int count)
1294 {
1295         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1296 }
1297
1298 static void prepare_read_regs_int(struct zd_usb *usb)
1299 {
1300         struct zd_usb_interrupt *intr = &usb->intr;
1301
1302         spin_lock_irq(&intr->lock);
1303         intr->read_regs_enabled = 1;
1304         INIT_COMPLETION(intr->read_regs.completion);
1305         spin_unlock_irq(&intr->lock);
1306 }
1307
1308 static void disable_read_regs_int(struct zd_usb *usb)
1309 {
1310         struct zd_usb_interrupt *intr = &usb->intr;
1311
1312         spin_lock_irq(&intr->lock);
1313         intr->read_regs_enabled = 0;
1314         spin_unlock_irq(&intr->lock);
1315 }
1316
1317 static int get_results(struct zd_usb *usb, u16 *values,
1318                        struct usb_req_read_regs *req, unsigned int count)
1319 {
1320         int r;
1321         int i;
1322         struct zd_usb_interrupt *intr = &usb->intr;
1323         struct read_regs_int *rr = &intr->read_regs;
1324         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1325
1326         spin_lock_irq(&intr->lock);
1327
1328         r = -EIO;
1329         /* The created block size seems to be larger than expected.
1330          * However results appear to be correct.
1331          */
1332         if (rr->length < usb_int_regs_length(count)) {
1333                 dev_dbg_f(zd_usb_dev(usb),
1334                          "error: actual length %d less than expected %d\n",
1335                          rr->length, usb_int_regs_length(count));
1336                 goto error_unlock;
1337         }
1338         if (rr->length > sizeof(rr->buffer)) {
1339                 dev_dbg_f(zd_usb_dev(usb),
1340                          "error: actual length %d exceeds buffer size %zu\n",
1341                          rr->length, sizeof(rr->buffer));
1342                 goto error_unlock;
1343         }
1344
1345         for (i = 0; i < count; i++) {
1346                 struct reg_data *rd = &regs->regs[i];
1347                 if (rd->addr != req->addr[i]) {
1348                         dev_dbg_f(zd_usb_dev(usb),
1349                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1350                                  le16_to_cpu(rd->addr),
1351                                  le16_to_cpu(req->addr[i]));
1352                         goto error_unlock;
1353                 }
1354                 values[i] = le16_to_cpu(rd->value);
1355         }
1356
1357         r = 0;
1358 error_unlock:
1359         spin_unlock_irq(&intr->lock);
1360         return r;
1361 }
1362
1363 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1364                      const zd_addr_t *addresses, unsigned int count)
1365 {
1366         int r;
1367         int i, req_len, actual_req_len;
1368         struct usb_device *udev;
1369         struct usb_req_read_regs *req = NULL;
1370         unsigned long timeout;
1371
1372         if (count < 1) {
1373                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1374                 return -EINVAL;
1375         }
1376         if (count > USB_MAX_IOREAD16_COUNT) {
1377                 dev_dbg_f(zd_usb_dev(usb),
1378                          "error: count %u exceeds possible max %u\n",
1379                          count, USB_MAX_IOREAD16_COUNT);
1380                 return -EINVAL;
1381         }
1382         if (in_atomic()) {
1383                 dev_dbg_f(zd_usb_dev(usb),
1384                          "error: io in atomic context not supported\n");
1385                 return -EWOULDBLOCK;
1386         }
1387         if (!usb_int_enabled(usb)) {
1388                  dev_dbg_f(zd_usb_dev(usb),
1389                           "error: usb interrupt not enabled\n");
1390                 return -EWOULDBLOCK;
1391         }
1392
1393         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1394         req = kmalloc(req_len, GFP_KERNEL);
1395         if (!req)
1396                 return -ENOMEM;
1397         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1398         for (i = 0; i < count; i++)
1399                 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1400
1401         udev = zd_usb_to_usbdev(usb);
1402         prepare_read_regs_int(usb);
1403         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1404                          req, req_len, &actual_req_len, 1000 /* ms */);
1405         if (r) {
1406                 dev_dbg_f(zd_usb_dev(usb),
1407                         "error in usb_bulk_msg(). Error number %d\n", r);
1408                 goto error;
1409         }
1410         if (req_len != actual_req_len) {
1411                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1412                         " req_len %d != actual_req_len %d\n",
1413                         req_len, actual_req_len);
1414                 r = -EIO;
1415                 goto error;
1416         }
1417
1418         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1419                                               msecs_to_jiffies(1000));
1420         if (!timeout) {
1421                 disable_read_regs_int(usb);
1422                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1423                 r = -ETIMEDOUT;
1424                 goto error;
1425         }
1426
1427         r = get_results(usb, values, req, count);
1428 error:
1429         kfree(req);
1430         return r;
1431 }
1432
1433 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1434                       unsigned int count)
1435 {
1436         int r;
1437         struct usb_device *udev;
1438         struct usb_req_write_regs *req = NULL;
1439         int i, req_len, actual_req_len;
1440
1441         if (count == 0)
1442                 return 0;
1443         if (count > USB_MAX_IOWRITE16_COUNT) {
1444                 dev_dbg_f(zd_usb_dev(usb),
1445                         "error: count %u exceeds possible max %u\n",
1446                         count, USB_MAX_IOWRITE16_COUNT);
1447                 return -EINVAL;
1448         }
1449         if (in_atomic()) {
1450                 dev_dbg_f(zd_usb_dev(usb),
1451                         "error: io in atomic context not supported\n");
1452                 return -EWOULDBLOCK;
1453         }
1454
1455         req_len = sizeof(struct usb_req_write_regs) +
1456                   count * sizeof(struct reg_data);
1457         req = kmalloc(req_len, GFP_KERNEL);
1458         if (!req)
1459                 return -ENOMEM;
1460
1461         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1462         for (i = 0; i < count; i++) {
1463                 struct reg_data *rw  = &req->reg_writes[i];
1464                 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1465                 rw->value = cpu_to_le16(ioreqs[i].value);
1466         }
1467
1468         udev = zd_usb_to_usbdev(usb);
1469         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1470                          req, req_len, &actual_req_len, 1000 /* ms */);
1471         if (r) {
1472                 dev_dbg_f(zd_usb_dev(usb),
1473                         "error in usb_bulk_msg(). Error number %d\n", r);
1474                 goto error;
1475         }
1476         if (req_len != actual_req_len) {
1477                 dev_dbg_f(zd_usb_dev(usb),
1478                         "error in usb_bulk_msg()"
1479                         " req_len %d != actual_req_len %d\n",
1480                         req_len, actual_req_len);
1481                 r = -EIO;
1482                 goto error;
1483         }
1484
1485         /* FALL-THROUGH with r == 0 */
1486 error:
1487         kfree(req);
1488         return r;
1489 }
1490
1491 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1492 {
1493         int r;
1494         struct usb_device *udev;
1495         struct usb_req_rfwrite *req = NULL;
1496         int i, req_len, actual_req_len;
1497         u16 bit_value_template;
1498
1499         if (in_atomic()) {
1500                 dev_dbg_f(zd_usb_dev(usb),
1501                         "error: io in atomic context not supported\n");
1502                 return -EWOULDBLOCK;
1503         }
1504         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1505                 dev_dbg_f(zd_usb_dev(usb),
1506                         "error: bits %d are smaller than"
1507                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1508                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1509                 return -EINVAL;
1510         }
1511         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1512                 dev_dbg_f(zd_usb_dev(usb),
1513                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1514                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1515                 return -EINVAL;
1516         }
1517 #ifdef DEBUG
1518         if (value & (~0UL << bits)) {
1519                 dev_dbg_f(zd_usb_dev(usb),
1520                         "error: value %#09x has bits >= %d set\n",
1521                         value, bits);
1522                 return -EINVAL;
1523         }
1524 #endif /* DEBUG */
1525
1526         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1527
1528         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1529         if (r) {
1530                 dev_dbg_f(zd_usb_dev(usb),
1531                         "error %d: Couldn't read CR203\n", r);
1532                 goto out;
1533         }
1534         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1535
1536         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1537         req = kmalloc(req_len, GFP_KERNEL);
1538         if (!req)
1539                 return -ENOMEM;
1540
1541         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1542         /* 1: 3683a, but not used in ZYDAS driver */
1543         req->value = cpu_to_le16(2);
1544         req->bits = cpu_to_le16(bits);
1545
1546         for (i = 0; i < bits; i++) {
1547                 u16 bv = bit_value_template;
1548                 if (value & (1 << (bits-1-i)))
1549                         bv |= RF_DATA;
1550                 req->bit_values[i] = cpu_to_le16(bv);
1551         }
1552
1553         udev = zd_usb_to_usbdev(usb);
1554         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1555                          req, req_len, &actual_req_len, 1000 /* ms */);
1556         if (r) {
1557                 dev_dbg_f(zd_usb_dev(usb),
1558                         "error in usb_bulk_msg(). Error number %d\n", r);
1559                 goto out;
1560         }
1561         if (req_len != actual_req_len) {
1562                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1563                         " req_len %d != actual_req_len %d\n",
1564                         req_len, actual_req_len);
1565                 r = -EIO;
1566                 goto out;
1567         }
1568
1569         /* FALL-THROUGH with r == 0 */
1570 out:
1571         kfree(req);
1572         return r;
1573 }