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/slab.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/usb.h>
  30 #include <linux/workqueue.h>
  31 #include <net/mac80211.h>
  32 #include <asm/unaligned.h>
  33
  34 #include "zd_def.h"
  35 #include "zd_mac.h"
  36 #include "zd_usb.h"
  37
  38 static struct usb_device_id usb_ids[] = {
  39         /* ZD1211 */
  40         { USB_DEVICE(0x0105, 0x145f), .driver_info = DEVICE_ZD1211 },
  41         { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
  42         { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
  43         { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
  44         { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
  45         { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
  46         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
  47         { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
  48         { USB_DEVICE(0x0ace, 0xa211), .driver_info = DEVICE_ZD1211 },
  49         { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
  50         { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
  51         { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
  52         { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
  53         { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
  54         { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
  55         { USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 },
  56         { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
  57         { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
  58         { USB_DEVICE(0x14ea, 0xab10), .driver_info = DEVICE_ZD1211 },
  59         { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
  60         { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 },
  61         { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
  62         { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
  63         { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
  64         { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
  65         /* ZD1211B */
  66         { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
  67         { USB_DEVICE(0x0409, 0x0248), .driver_info = DEVICE_ZD1211B },
  68         { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
  69         { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
  70         { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
  71         { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
  72         { USB_DEVICE(0x054c, 0x0257), .driver_info = DEVICE_ZD1211B },
  73         { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
  74         { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
  75         { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
  76         { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
  77         { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
  78         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  79         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211B },
  80         { USB_DEVICE(0x07fa, 0x1196), .driver_info = DEVICE_ZD1211B },
  81         { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
  82         { USB_DEVICE(0x083a, 0xe501), .driver_info = DEVICE_ZD1211B },
  83         { USB_DEVICE(0x083a, 0xe503), .driver_info = DEVICE_ZD1211B },
  84         { USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B },
  85         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  86         { USB_DEVICE(0x0ace, 0xb215), .driver_info = DEVICE_ZD1211B },
  87         { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
  88         { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
  89         { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
  90         { USB_DEVICE(0x0df6, 0x0036), .driver_info = DEVICE_ZD1211B },
  91         { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
  92         { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
  93         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  94         { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
  95         { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
  96         { USB_DEVICE(0x2019, 0xed01), .driver_info = DEVICE_ZD1211B },
  97         /* "Driverless" devices that need ejecting */
  98         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
  99         { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
 100         {}
 101 };
 102
 103 MODULE_LICENSE("GPL");
 104 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
 105 MODULE_AUTHOR("Ulrich Kunitz");
 106 MODULE_AUTHOR("Daniel Drake");
 107 MODULE_VERSION("1.0");
 108 MODULE_DEVICE_TABLE(usb, usb_ids);
 109
 110 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
 111 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
 112
 113 /* USB device initialization */
 114 static void int_urb_complete(struct urb *urb);
 115
 116 static int request_fw_file(
 117         const struct firmware **fw, const char *name, struct device *device)
 118 {
 119         int r;
 120
 121         dev_dbg_f(device, "fw name %s\n", name);
 122
 123         r = request_firmware(fw, name, device);
 124         if (r)
 125                 dev_err(device,
 126                        "Could not load firmware file %s. Error number %d\n",
 127                        name, r);
 128         return r;
 129 }
 130
 131 static inline u16 get_bcdDevice(const struct usb_device *udev)
 132 {
 133         return le16_to_cpu(udev->descriptor.bcdDevice);
 134 }
 135
 136 enum upload_code_flags {
 137         REBOOT = 1,
 138 };
 139
 140 /* Ensures that MAX_TRANSFER_SIZE is even. */
 141 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 142
 143 static int upload_code(struct usb_device *udev,
 144         const u8 *data, size_t size, u16 code_offset, int flags)
 145 {
 146         u8 *p;
 147         int r;
 148
 149         /* USB request blocks need "kmalloced" buffers.
 150          */
 151         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 152         if (!p) {
 153                 dev_err(&udev->dev, "out of memory\n");
 154                 r = -ENOMEM;
 155                 goto error;
 156         }
 157
 158         size &= ~1;
 159         while (size > 0) {
 160                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 161                         size : MAX_TRANSFER_SIZE;
 162
 163                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 164
 165                 memcpy(p, data, transfer_size);
 166                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 167                         USB_REQ_FIRMWARE_DOWNLOAD,
 168                         USB_DIR_OUT | USB_TYPE_VENDOR,
 169                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 170                 if (r < 0) {
 171                         dev_err(&udev->dev,
 172                                "USB control request for firmware upload"
 173                                " failed. Error number %d\n", r);
 174                         goto error;
 175                 }
 176                 transfer_size = r & ~1;
 177
 178                 size -= transfer_size;
 179                 data += transfer_size;
 180                 code_offset += transfer_size/sizeof(u16);
 181         }
 182
 183         if (flags & REBOOT) {
 184                 u8 ret;
 185
 186                 /* Use "DMA-aware" buffer. */
 187                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 188                         USB_REQ_FIRMWARE_CONFIRM,
 189                         USB_DIR_IN | USB_TYPE_VENDOR,
 190                         0, 0, p, sizeof(ret), 5000 /* ms */);
 191                 if (r != sizeof(ret)) {
 192                         dev_err(&udev->dev,
 193                                 "control request firmeware confirmation failed."
 194                                 " Return value %d\n", r);
 195                         if (r >= 0)
 196                                 r = -ENODEV;
 197                         goto error;
 198                 }
 199                 ret = p[0];
 200                 if (ret & 0x80) {
 201                         dev_err(&udev->dev,
 202                                 "Internal error while downloading."
 203                                 " Firmware confirm return value %#04x\n",
 204                                 (unsigned int)ret);
 205                         r = -ENODEV;
 206                         goto error;
 207                 }
 208                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 209                         (unsigned int)ret);
 210         }
 211
 212         r = 0;
 213 error:
 214         kfree(p);
 215         return r;
 216 }
 217
 218 static u16 get_word(const void *data, u16 offset)
 219 {
 220         const __le16 *p = data;
 221         return le16_to_cpu(p[offset]);
 222 }
 223
 224 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
 225                        const char* postfix)
 226 {
 227         scnprintf(buffer, size, "%s%s",
 228                 usb->is_zd1211b ?
 229                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 230                 postfix);
 231         return buffer;
 232 }
 233
 234 static int handle_version_mismatch(struct zd_usb *usb,
 235         const struct firmware *ub_fw)
 236 {
 237         struct usb_device *udev = zd_usb_to_usbdev(usb);
 238         const struct firmware *ur_fw = NULL;
 239         int offset;
 240         int r = 0;
 241         char fw_name[128];
 242
 243         r = request_fw_file(&ur_fw,
 244                 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
 245                 &udev->dev);
 246         if (r)
 247                 goto error;
 248
 249         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
 250         if (r)
 251                 goto error;
 252
 253         offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
 254         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
 255                 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
 256
 257         /* At this point, the vendor driver downloads the whole firmware
 258          * image, hacks around with version IDs, and uploads it again,
 259          * completely overwriting the boot code. We do not do this here as
 260          * it is not required on any tested devices, and it is suspected to
 261          * cause problems. */
 262 error:
 263         release_firmware(ur_fw);
 264         return r;
 265 }
 266
 267 static int upload_firmware(struct zd_usb *usb)
 268 {
 269         int r;
 270         u16 fw_bcdDevice;
 271         u16 bcdDevice;
 272         struct usb_device *udev = zd_usb_to_usbdev(usb);
 273         const struct firmware *ub_fw = NULL;
 274         const struct firmware *uph_fw = NULL;
 275         char fw_name[128];
 276
 277         bcdDevice = get_bcdDevice(udev);
 278
 279         r = request_fw_file(&ub_fw,
 280                 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
 281                 &udev->dev);
 282         if (r)
 283                 goto error;
 284
 285         fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
 286
 287         if (fw_bcdDevice != bcdDevice) {
 288                 dev_info(&udev->dev,
 289                         "firmware version %#06x and device bootcode version "
 290                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
 291                 if (bcdDevice <= 0x4313)
 292                         dev_warn(&udev->dev, "device has old bootcode, please "
 293                                 "report success or failure\n");
 294
 295                 r = handle_version_mismatch(usb, ub_fw);
 296                 if (r)
 297                         goto error;
 298         } else {
 299                 dev_dbg_f(&udev->dev,
 300                         "firmware device id %#06x is equal to the "
 301                         "actual device id\n", fw_bcdDevice);
 302         }
 303
 304
 305         r = request_fw_file(&uph_fw,
 306                 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
 307                 &udev->dev);
 308         if (r)
 309                 goto error;
 310
 311         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
 312         if (r) {
 313                 dev_err(&udev->dev,
 314                         "Could not upload firmware code uph. Error number %d\n",
 315                         r);
 316         }
 317
 318         /* FALL-THROUGH */
 319 error:
 320         release_firmware(ub_fw);
 321         release_firmware(uph_fw);
 322         return r;
 323 }
 324
 325 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ur");
 326 MODULE_FIRMWARE(FW_ZD1211_PREFIX "ur");
 327 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ub");
 328 MODULE_FIRMWARE(FW_ZD1211_PREFIX "ub");
 329 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "uphr");
 330 MODULE_FIRMWARE(FW_ZD1211_PREFIX "uphr");
 331
 332 /* Read data from device address space using "firmware interface" which does
 333  * not require firmware to be loaded. */
 334 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
 335 {
 336         int r;
 337         struct usb_device *udev = zd_usb_to_usbdev(usb);
 338         u8 *buf;
 339
 340         /* Use "DMA-aware" buffer. */
 341         buf = kmalloc(len, GFP_KERNEL);
 342         if (!buf)
 343                 return -ENOMEM;
 344         r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 345                 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
 346                 buf, len, 5000);
 347         if (r < 0) {
 348                 dev_err(&udev->dev,
 349                         "read over firmware interface failed: %d\n", r);
 350                 goto exit;
 351         } else if (r != len) {
 352                 dev_err(&udev->dev,
 353                         "incomplete read over firmware interface: %d/%d\n",
 354                         r, len);
 355                 r = -EIO;
 356                 goto exit;
 357         }
 358         r = 0;
 359         memcpy(data, buf, len);
 360 exit:
 361         kfree(buf);
 362         return r;
 363 }
 364
 365 #define urb_dev(urb) (&(urb)->dev->dev)
 366
 367 static inline void handle_regs_int(struct urb *urb)
 368 {
 369         struct zd_usb *usb = urb->context;
 370         struct zd_usb_interrupt *intr = &usb->intr;
 371         int len;
 372         u16 int_num;
 373
 374         ZD_ASSERT(in_interrupt());
 375         spin_lock(&intr->lock);
 376
 377         int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));
 378         if (int_num == CR_INTERRUPT) {
 379                 struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
 380                 spin_lock(&mac->lock);
 381                 memcpy(&mac->intr_buffer, urb->transfer_buffer,
 382                                 USB_MAX_EP_INT_BUFFER);
 383                 spin_unlock(&mac->lock);
 384                 schedule_work(&mac->process_intr);
 385         } else if (intr->read_regs_enabled) {
 386                 intr->read_regs.length = len = urb->actual_length;
 387
 388                 if (len > sizeof(intr->read_regs.buffer))
 389                         len = sizeof(intr->read_regs.buffer);
 390                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 391                 intr->read_regs_enabled = 0;
 392                 complete(&intr->read_regs.completion);
 393                 goto out;
 394         }
 395
 396 out:
 397         spin_unlock(&intr->lock);
 398 }
 399
 400 static void int_urb_complete(struct urb *urb)
 401 {
 402         int r;
 403         struct usb_int_header *hdr;
 404
 405         switch (urb->status) {
 406         case 0:
 407                 break;
 408         case -ESHUTDOWN:
 409         case -EINVAL:
 410         case -ENODEV:
 411         case -ENOENT:
 412         case -ECONNRESET:
 413         case -EPIPE:
 414                 return;
 415         default:
 416                 goto resubmit;
 417         }
 418
 419         if (urb->actual_length < sizeof(hdr)) {
 420                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 421                 goto resubmit;
 422         }
 423
 424         hdr = urb->transfer_buffer;
 425         if (hdr->type != USB_INT_TYPE) {
 426                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 427                 goto resubmit;
 428         }
 429
 430         switch (hdr->id) {
 431         case USB_INT_ID_REGS:
 432                 handle_regs_int(urb);
 433                 break;
 434         case USB_INT_ID_RETRY_FAILED:
 435                 zd_mac_tx_failed(urb);
 436                 break;
 437         default:
 438                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 439                         (unsigned int)hdr->id);
 440                 goto resubmit;
 441         }
 442
 443 resubmit:
 444         r = usb_submit_urb(urb, GFP_ATOMIC);
 445         if (r) {
 446                 dev_dbg_f(urb_dev(urb), "error: resubmit urb %p err code %d\n",
 447                           urb, r);
 448                 /* TODO: add worker to reset intr->urb */
 449         }
 450         return;
 451 }
 452
 453 static inline int int_urb_interval(struct usb_device *udev)
 454 {
 455         switch (udev->speed) {
 456         case USB_SPEED_HIGH:
 457                 return 4;
 458         case USB_SPEED_LOW:
 459                 return 10;
 460         case USB_SPEED_FULL:
 461         default:
 462                 return 1;
 463         }
 464 }
 465
 466 static inline int usb_int_enabled(struct zd_usb *usb)
 467 {
 468         unsigned long flags;
 469         struct zd_usb_interrupt *intr = &usb->intr;
 470         struct urb *urb;
 471
 472         spin_lock_irqsave(&intr->lock, flags);
 473         urb = intr->urb;
 474         spin_unlock_irqrestore(&intr->lock, flags);
 475         return urb != NULL;
 476 }
 477
 478 int zd_usb_enable_int(struct zd_usb *usb)
 479 {
 480         int r;
 481         struct usb_device *udev = zd_usb_to_usbdev(usb);
 482         struct zd_usb_interrupt *intr = &usb->intr;
 483         struct urb *urb;
 484
 485         dev_dbg_f(zd_usb_dev(usb), "\n");
 486
 487         urb = usb_alloc_urb(0, GFP_KERNEL);
 488         if (!urb) {
 489                 r = -ENOMEM;
 490                 goto out;
 491         }
 492
 493         ZD_ASSERT(!irqs_disabled());
 494         spin_lock_irq(&intr->lock);
 495         if (intr->urb) {
 496                 spin_unlock_irq(&intr->lock);
 497                 r = 0;
 498                 goto error_free_urb;
 499         }
 500         intr->urb = urb;
 501         spin_unlock_irq(&intr->lock);
 502
 503         r = -ENOMEM;
 504         intr->buffer = usb_alloc_coherent(udev, USB_MAX_EP_INT_BUFFER,
 505                                           GFP_KERNEL, &intr->buffer_dma);
 506         if (!intr->buffer) {
 507                 dev_dbg_f(zd_usb_dev(usb),
 508                         "couldn't allocate transfer_buffer\n");
 509                 goto error_set_urb_null;
 510         }
 511
 512         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 513                          intr->buffer, USB_MAX_EP_INT_BUFFER,
 514                          int_urb_complete, usb,
 515                          intr->interval);
 516         urb->transfer_dma = intr->buffer_dma;
 517         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 518
 519         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 520         r = usb_submit_urb(urb, GFP_KERNEL);
 521         if (r) {
 522                 dev_dbg_f(zd_usb_dev(usb),
 523                          "Couldn't submit urb. Error number %d\n", r);
 524                 goto error;
 525         }
 526
 527         return 0;
 528 error:
 529         usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER,
 530                           intr->buffer, intr->buffer_dma);
 531 error_set_urb_null:
 532         spin_lock_irq(&intr->lock);
 533         intr->urb = NULL;
 534         spin_unlock_irq(&intr->lock);
 535 error_free_urb:
 536         usb_free_urb(urb);
 537 out:
 538         return r;
 539 }
 540
 541 void zd_usb_disable_int(struct zd_usb *usb)
 542 {
 543         unsigned long flags;
 544         struct usb_device *udev = zd_usb_to_usbdev(usb);
 545         struct zd_usb_interrupt *intr = &usb->intr;
 546         struct urb *urb;
 547         void *buffer;
 548         dma_addr_t buffer_dma;
 549
 550         spin_lock_irqsave(&intr->lock, flags);
 551         urb = intr->urb;
 552         if (!urb) {
 553                 spin_unlock_irqrestore(&intr->lock, flags);
 554                 return;
 555         }
 556         intr->urb = NULL;
 557         buffer = intr->buffer;
 558         buffer_dma = intr->buffer_dma;
 559         intr->buffer = NULL;
 560         spin_unlock_irqrestore(&intr->lock, flags);
 561
 562         usb_kill_urb(urb);
 563         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 564         usb_free_urb(urb);
 565
 566         if (buffer)
 567                 usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER,
 568                                   buffer, buffer_dma);
 569 }
 570
 571 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 572                              unsigned int length)
 573 {
 574         int i;
 575         const struct rx_length_info *length_info;
 576
 577         if (length < sizeof(struct rx_length_info)) {
 578                 /* It's not a complete packet anyhow. */
 579                 printk("%s: invalid, small RX packet : %d\n",
 580                        __func__, length);
 581                 return;
 582         }
 583         length_info = (struct rx_length_info *)
 584                 (buffer + length - sizeof(struct rx_length_info));
 585
 586         /* It might be that three frames are merged into a single URB
 587          * transaction. We have to check for the length info tag.
 588          *
 589          * While testing we discovered that length_info might be unaligned,
 590          * because if USB transactions are merged, the last packet will not
 591          * be padded. Unaligned access might also happen if the length_info
 592          * structure is not present.
 593          */
 594         if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG)
 595         {
 596                 unsigned int l, k, n;
 597                 for (i = 0, l = 0;; i++) {
 598                         k = get_unaligned_le16(&length_info->length[i]);
 599                         if (k == 0)
 600                                 return;
 601                         n = l+k;
 602                         if (n > length)
 603                                 return;
 604                         zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
 605                         if (i >= 2)
 606                                 return;
 607                         l = (n+3) & ~3;
 608                 }
 609         } else {
 610                 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
 611         }
 612 }
 613
 614 static void rx_urb_complete(struct urb *urb)
 615 {
 616         struct zd_usb *usb;
 617         struct zd_usb_rx *rx;
 618         const u8 *buffer;
 619         unsigned int length;
 620
 621         switch (urb->status) {
 622         case 0:
 623                 break;
 624         case -ESHUTDOWN:
 625         case -EINVAL:
 626         case -ENODEV:
 627         case -ENOENT:
 628         case -ECONNRESET:
 629         case -EPIPE:
 630                 return;
 631         default:
 632                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 633                 goto resubmit;
 634         }
 635
 636         buffer = urb->transfer_buffer;
 637         length = urb->actual_length;
 638         usb = urb->context;
 639         rx = &usb->rx;
 640
 641         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 642                 /* If there is an old first fragment, we don't care. */
 643                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 644                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 645                 spin_lock(&rx->lock);
 646                 memcpy(rx->fragment, buffer, length);
 647                 rx->fragment_length = length;
 648                 spin_unlock(&rx->lock);
 649                 goto resubmit;
 650         }
 651
 652         spin_lock(&rx->lock);
 653         if (rx->fragment_length > 0) {
 654                 /* We are on a second fragment, we believe */
 655                 ZD_ASSERT(length + rx->fragment_length <=
 656                           ARRAY_SIZE(rx->fragment));
 657                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 658                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 659                 handle_rx_packet(usb, rx->fragment,
 660                                  rx->fragment_length + length);
 661                 rx->fragment_length = 0;
 662                 spin_unlock(&rx->lock);
 663         } else {
 664                 spin_unlock(&rx->lock);
 665                 handle_rx_packet(usb, buffer, length);
 666         }
 667
 668 resubmit:
 669         usb_submit_urb(urb, GFP_ATOMIC);
 670 }
 671
 672 static struct urb *alloc_rx_urb(struct zd_usb *usb)
 673 {
 674         struct usb_device *udev = zd_usb_to_usbdev(usb);
 675         struct urb *urb;
 676         void *buffer;
 677
 678         urb = usb_alloc_urb(0, GFP_KERNEL);
 679         if (!urb)
 680                 return NULL;
 681         buffer = usb_alloc_coherent(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
 682                                     &urb->transfer_dma);
 683         if (!buffer) {
 684                 usb_free_urb(urb);
 685                 return NULL;
 686         }
 687
 688         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 689                           buffer, USB_MAX_RX_SIZE,
 690                           rx_urb_complete, usb);
 691         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 692
 693         return urb;
 694 }
 695
 696 static void free_rx_urb(struct urb *urb)
 697 {
 698         if (!urb)
 699                 return;
 700         usb_free_coherent(urb->dev, urb->transfer_buffer_length,
 701                           urb->transfer_buffer, urb->transfer_dma);
 702         usb_free_urb(urb);
 703 }
 704
 705 int zd_usb_enable_rx(struct zd_usb *usb)
 706 {
 707         int i, r;
 708         struct zd_usb_rx *rx = &usb->rx;
 709         struct urb **urbs;
 710
 711         dev_dbg_f(zd_usb_dev(usb), "\n");
 712
 713         r = -ENOMEM;
 714         urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
 715         if (!urbs)
 716                 goto error;
 717         for (i = 0; i < RX_URBS_COUNT; i++) {
 718                 urbs[i] = alloc_rx_urb(usb);
 719                 if (!urbs[i])
 720                         goto error;
 721         }
 722
 723         ZD_ASSERT(!irqs_disabled());
 724         spin_lock_irq(&rx->lock);
 725         if (rx->urbs) {
 726                 spin_unlock_irq(&rx->lock);
 727                 r = 0;
 728                 goto error;
 729         }
 730         rx->urbs = urbs;
 731         rx->urbs_count = RX_URBS_COUNT;
 732         spin_unlock_irq(&rx->lock);
 733
 734         for (i = 0; i < RX_URBS_COUNT; i++) {
 735                 r = usb_submit_urb(urbs[i], GFP_KERNEL);
 736                 if (r)
 737                         goto error_submit;
 738         }
 739
 740         return 0;
 741 error_submit:
 742         for (i = 0; i < RX_URBS_COUNT; i++) {
 743                 usb_kill_urb(urbs[i]);
 744         }
 745         spin_lock_irq(&rx->lock);
 746         rx->urbs = NULL;
 747         rx->urbs_count = 0;
 748         spin_unlock_irq(&rx->lock);
 749 error:
 750         if (urbs) {
 751                 for (i = 0; i < RX_URBS_COUNT; i++)
 752                         free_rx_urb(urbs[i]);
 753         }
 754         return r;
 755 }
 756
 757 void zd_usb_disable_rx(struct zd_usb *usb)
 758 {
 759         int i;
 760         unsigned long flags;
 761         struct urb **urbs;
 762         unsigned int count;
 763         struct zd_usb_rx *rx = &usb->rx;
 764
 765         spin_lock_irqsave(&rx->lock, flags);
 766         urbs = rx->urbs;
 767         count = rx->urbs_count;
 768         spin_unlock_irqrestore(&rx->lock, flags);
 769         if (!urbs)
 770                 return;
 771
 772         for (i = 0; i < count; i++) {
 773                 usb_kill_urb(urbs[i]);
 774                 free_rx_urb(urbs[i]);
 775         }
 776         kfree(urbs);
 777
 778         spin_lock_irqsave(&rx->lock, flags);
 779         rx->urbs = NULL;
 780         rx->urbs_count = 0;
 781         spin_unlock_irqrestore(&rx->lock, flags);
 782 }
 783
 784 /**
 785  * zd_usb_disable_tx - disable transmission
 786  * @usb: the zd1211rw-private USB structure
 787  *
 788  * Frees all URBs in the free list and marks the transmission as disabled.
 789  */
 790 void zd_usb_disable_tx(struct zd_usb *usb)
 791 {
 792         struct zd_usb_tx *tx = &usb->tx;
 793         unsigned long flags;
 794
 795         atomic_set(&tx->enabled, 0);
 796
 797         /* kill all submitted tx-urbs */
 798         usb_kill_anchored_urbs(&tx->submitted);
 799
 800         spin_lock_irqsave(&tx->lock, flags);
 801         WARN_ON(tx->submitted_urbs != 0);
 802         tx->submitted_urbs = 0;
 803         spin_unlock_irqrestore(&tx->lock, flags);
 804
 805         /* The stopped state is ignored, relying on ieee80211_wake_queues()
 806          * in a potentionally following zd_usb_enable_tx().
 807          */
 808 }
 809
 810 /**
 811  * zd_usb_enable_tx - enables transmission
 812  * @usb: a &struct zd_usb pointer
 813  *
 814  * This function enables transmission and prepares the &zd_usb_tx data
 815  * structure.
 816  */
 817 void zd_usb_enable_tx(struct zd_usb *usb)
 818 {
 819         unsigned long flags;
 820         struct zd_usb_tx *tx = &usb->tx;
 821
 822         spin_lock_irqsave(&tx->lock, flags);
 823         atomic_set(&tx->enabled, 1);
 824         tx->submitted_urbs = 0;
 825         ieee80211_wake_queues(zd_usb_to_hw(usb));
 826         tx->stopped = 0;
 827         spin_unlock_irqrestore(&tx->lock, flags);
 828 }
 829
 830 static void tx_dec_submitted_urbs(struct zd_usb *usb)
 831 {
 832         struct zd_usb_tx *tx = &usb->tx;
 833         unsigned long flags;
 834
 835         spin_lock_irqsave(&tx->lock, flags);
 836         --tx->submitted_urbs;
 837         if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) {
 838                 ieee80211_wake_queues(zd_usb_to_hw(usb));
 839                 tx->stopped = 0;
 840         }
 841         spin_unlock_irqrestore(&tx->lock, flags);
 842 }
 843
 844 static void tx_inc_submitted_urbs(struct zd_usb *usb)
 845 {
 846         struct zd_usb_tx *tx = &usb->tx;
 847         unsigned long flags;
 848
 849         spin_lock_irqsave(&tx->lock, flags);
 850         ++tx->submitted_urbs;
 851         if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
 852                 ieee80211_stop_queues(zd_usb_to_hw(usb));
 853                 tx->stopped = 1;
 854         }
 855         spin_unlock_irqrestore(&tx->lock, flags);
 856 }
 857
 858 /**
 859  * tx_urb_complete - completes the execution of an URB
 860  * @urb: a URB
 861  *
 862  * This function is called if the URB has been transferred to a device or an
 863  * error has happened.
 864  */
 865 static void tx_urb_complete(struct urb *urb)
 866 {
 867         int r;
 868         struct sk_buff *skb;
 869         struct ieee80211_tx_info *info;
 870         struct zd_usb *usb;
 871         struct zd_usb_tx *tx;
 872
 873         skb = (struct sk_buff *)urb->context;
 874         info = IEEE80211_SKB_CB(skb);
 875         /*
 876          * grab 'usb' pointer before handing off the skb (since
 877          * it might be freed by zd_mac_tx_to_dev or mac80211)
 878          */
 879         usb = &zd_hw_mac(info->rate_driver_data[0])->chip.usb;
 880         tx = &usb->tx;
 881
 882         switch (urb->status) {
 883         case 0:
 884                 break;
 885         case -ESHUTDOWN:
 886         case -EINVAL:
 887         case -ENODEV:
 888         case -ENOENT:
 889         case -ECONNRESET:
 890         case -EPIPE:
 891                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 892                 break;
 893         default:
 894                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 895                 goto resubmit;
 896         }
 897 free_urb:
 898         zd_mac_tx_to_dev(skb, urb->status);
 899         usb_free_urb(urb);
 900         tx_dec_submitted_urbs(usb);
 901         return;
 902 resubmit:
 903         usb_anchor_urb(urb, &tx->submitted);
 904         r = usb_submit_urb(urb, GFP_ATOMIC);
 905         if (r) {
 906                 usb_unanchor_urb(urb);
 907                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 908                 goto free_urb;
 909         }
 910 }
 911
 912 /**
 913  * zd_usb_tx: initiates transfer of a frame of the device
 914  *
 915  * @usb: the zd1211rw-private USB structure
 916  * @skb: a &struct sk_buff pointer
 917  *
 918  * This function tranmits a frame to the device. It doesn't wait for
 919  * completion. The frame must contain the control set and have all the
 920  * control set information available.
 921  *
 922  * The function returns 0 if the transfer has been successfully initiated.
 923  */
 924 int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
 925 {
 926         int r;
 927         struct usb_device *udev = zd_usb_to_usbdev(usb);
 928         struct urb *urb;
 929         struct zd_usb_tx *tx = &usb->tx;
 930
 931         if (!atomic_read(&tx->enabled)) {
 932                 r = -ENOENT;
 933                 goto out;
 934         }
 935
 936         urb = usb_alloc_urb(0, GFP_ATOMIC);
 937         if (!urb) {
 938                 r = -ENOMEM;
 939                 goto out;
 940         }
 941
 942         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 943                           skb->data, skb->len, tx_urb_complete, skb);
 944
 945         usb_anchor_urb(urb, &tx->submitted);
 946         r = usb_submit_urb(urb, GFP_ATOMIC);
 947         if (r) {
 948                 usb_unanchor_urb(urb);
 949                 goto error;
 950         }
 951         tx_inc_submitted_urbs(usb);
 952         return 0;
 953 error:
 954         usb_free_urb(urb);
 955 out:
 956         return r;
 957 }
 958
 959 static inline void init_usb_interrupt(struct zd_usb *usb)
 960 {
 961         struct zd_usb_interrupt *intr = &usb->intr;
 962
 963         spin_lock_init(&intr->lock);
 964         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 965         init_completion(&intr->read_regs.completion);
 966         intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
 967 }
 968
 969 static inline void init_usb_rx(struct zd_usb *usb)
 970 {
 971         struct zd_usb_rx *rx = &usb->rx;
 972         spin_lock_init(&rx->lock);
 973         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 974                 rx->usb_packet_size = 512;
 975         } else {
 976                 rx->usb_packet_size = 64;
 977         }
 978         ZD_ASSERT(rx->fragment_length == 0);
 979 }
 980
 981 static inline void init_usb_tx(struct zd_usb *usb)
 982 {
 983         struct zd_usb_tx *tx = &usb->tx;
 984         spin_lock_init(&tx->lock);
 985         atomic_set(&tx->enabled, 0);
 986         tx->stopped = 0;
 987         init_usb_anchor(&tx->submitted);
 988         tx->submitted_urbs = 0;
 989 }
 990
 991 void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
 992                  struct usb_interface *intf)
 993 {
 994         memset(usb, 0, sizeof(*usb));
 995         usb->intf = usb_get_intf(intf);
 996         usb_set_intfdata(usb->intf, hw);
 997         init_usb_interrupt(usb);
 998         init_usb_tx(usb);
 999         init_usb_rx(usb);
1000 }
1001
1002 void zd_usb_clear(struct zd_usb *usb)
1003 {
1004         usb_set_intfdata(usb->intf, NULL);
1005         usb_put_intf(usb->intf);
1006         ZD_MEMCLEAR(usb, sizeof(*usb));
1007         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
1008 }
1009
1010 static const char *speed(enum usb_device_speed speed)
1011 {
1012         switch (speed) {
1013         case USB_SPEED_LOW:
1014                 return "low";
1015         case USB_SPEED_FULL:
1016                 return "full";
1017         case USB_SPEED_HIGH:
1018                 return "high";
1019         default:
1020                 return "unknown speed";
1021         }
1022 }
1023
1024 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
1025 {
1026         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1027                 le16_to_cpu(udev->descriptor.idVendor),
1028                 le16_to_cpu(udev->descriptor.idProduct),
1029                 get_bcdDevice(udev),
1030                 speed(udev->speed));
1031 }
1032
1033 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1034 {
1035         struct usb_device *udev = interface_to_usbdev(usb->intf);
1036         return scnprint_id(udev, buffer, size);
1037 }
1038
1039 #ifdef DEBUG
1040 static void print_id(struct usb_device *udev)
1041 {
1042         char buffer[40];
1043
1044         scnprint_id(udev, buffer, sizeof(buffer));
1045         buffer[sizeof(buffer)-1] = 0;
1046         dev_dbg_f(&udev->dev, "%s\n", buffer);
1047 }
1048 #else
1049 #define print_id(udev) do { } while (0)
1050 #endif
1051
1052 static int eject_installer(struct usb_interface *intf)
1053 {
1054         struct usb_device *udev = interface_to_usbdev(intf);
1055         struct usb_host_interface *iface_desc = &intf->altsetting[0];
1056         struct usb_endpoint_descriptor *endpoint;
1057         unsigned char *cmd;
1058         u8 bulk_out_ep;
1059         int r;
1060
1061         /* Find bulk out endpoint */
1062         for (r = 1; r >= 0; r--) {
1063                 endpoint = &iface_desc->endpoint[r].desc;
1064                 if (usb_endpoint_dir_out(endpoint) &&
1065                     usb_endpoint_xfer_bulk(endpoint)) {
1066                         bulk_out_ep = endpoint->bEndpointAddress;
1067                         break;
1068                 }
1069         }
1070         if (r == -1) {
1071                 dev_err(&udev->dev,
1072                         "zd1211rw: Could not find bulk out endpoint\n");
1073                 return -ENODEV;
1074         }
1075
1076         cmd = kzalloc(31, GFP_KERNEL);
1077         if (cmd == NULL)
1078                 return -ENODEV;
1079
1080         /* USB bulk command block */
1081         cmd[0] = 0x55;  /* bulk command signature */
1082         cmd[1] = 0x53;  /* bulk command signature */
1083         cmd[2] = 0x42;  /* bulk command signature */
1084         cmd[3] = 0x43;  /* bulk command signature */
1085         cmd[14] = 6;    /* command length */
1086
1087         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1088         cmd[19] = 0x2;  /* eject disc */
1089
1090         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1091         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1092                 cmd, 31, NULL, 2000);
1093         kfree(cmd);
1094         if (r)
1095                 return r;
1096
1097         /* At this point, the device disconnects and reconnects with the real
1098          * ID numbers. */
1099
1100         usb_set_intfdata(intf, NULL);
1101         return 0;
1102 }
1103
1104 int zd_usb_init_hw(struct zd_usb *usb)
1105 {
1106         int r;
1107         struct zd_mac *mac = zd_usb_to_mac(usb);
1108
1109         dev_dbg_f(zd_usb_dev(usb), "\n");
1110
1111         r = upload_firmware(usb);
1112         if (r) {
1113                 dev_err(zd_usb_dev(usb),
1114                        "couldn't load firmware. Error number %d\n", r);
1115                 return r;
1116         }
1117
1118         r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1119         if (r) {
1120                 dev_dbg_f(zd_usb_dev(usb),
1121                         "couldn't reset configuration. Error number %d\n", r);
1122                 return r;
1123         }
1124
1125         r = zd_mac_init_hw(mac->hw);
1126         if (r) {
1127                 dev_dbg_f(zd_usb_dev(usb),
1128                          "couldn't initialize mac. Error number %d\n", r);
1129                 return r;
1130         }
1131
1132         usb->initialized = 1;
1133         return 0;
1134 }
1135
1136 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1137 {
1138         int r;
1139         struct usb_device *udev = interface_to_usbdev(intf);
1140         struct zd_usb *usb;
1141         struct ieee80211_hw *hw = NULL;
1142
1143         print_id(udev);
1144
1145         if (id->driver_info & DEVICE_INSTALLER)
1146                 return eject_installer(intf);
1147
1148         switch (udev->speed) {
1149         case USB_SPEED_LOW:
1150         case USB_SPEED_FULL:
1151         case USB_SPEED_HIGH:
1152                 break;
1153         default:
1154                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1155                 r = -ENODEV;
1156                 goto error;
1157         }
1158
1159         r = usb_reset_device(udev);
1160         if (r) {
1161                 dev_err(&intf->dev,
1162                         "couldn't reset usb device. Error number %d\n", r);
1163                 goto error;
1164         }
1165
1166         hw = zd_mac_alloc_hw(intf);
1167         if (hw == NULL) {
1168                 r = -ENOMEM;
1169                 goto error;
1170         }
1171
1172         usb = &zd_hw_mac(hw)->chip.usb;
1173         usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1174
1175         r = zd_mac_preinit_hw(hw);
1176         if (r) {
1177                 dev_dbg_f(&intf->dev,
1178                          "couldn't initialize mac. Error number %d\n", r);
1179                 goto error;
1180         }
1181
1182         r = ieee80211_register_hw(hw);
1183         if (r) {
1184                 dev_dbg_f(&intf->dev,
1185                          "couldn't register device. Error number %d\n", r);
1186                 goto error;
1187         }
1188
1189         dev_dbg_f(&intf->dev, "successful\n");
1190         dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
1191         return 0;
1192 error:
1193         usb_reset_device(interface_to_usbdev(intf));
1194         if (hw) {
1195                 zd_mac_clear(zd_hw_mac(hw));
1196                 ieee80211_free_hw(hw);
1197         }
1198         return r;
1199 }
1200
1201 static void disconnect(struct usb_interface *intf)
1202 {
1203         struct ieee80211_hw *hw = zd_intf_to_hw(intf);
1204         struct zd_mac *mac;
1205         struct zd_usb *usb;
1206
1207         /* Either something really bad happened, or we're just dealing with
1208          * a DEVICE_INSTALLER. */
1209         if (hw == NULL)
1210                 return;
1211
1212         mac = zd_hw_mac(hw);
1213         usb = &mac->chip.usb;
1214
1215         dev_dbg_f(zd_usb_dev(usb), "\n");
1216
1217         ieee80211_unregister_hw(hw);
1218
1219         /* Just in case something has gone wrong! */
1220         zd_usb_disable_tx(usb);
1221         zd_usb_disable_rx(usb);
1222         zd_usb_disable_int(usb);
1223
1224         /* If the disconnect has been caused by a removal of the
1225          * driver module, the reset allows reloading of the driver. If the
1226          * reset will not be executed here, the upload of the firmware in the
1227          * probe function caused by the reloading of the driver will fail.
1228          */
1229         usb_reset_device(interface_to_usbdev(intf));
1230
1231         zd_mac_clear(mac);
1232         ieee80211_free_hw(hw);
1233         dev_dbg(&intf->dev, "disconnected\n");
1234 }
1235
1236 static struct usb_driver driver = {
1237         .name           = KBUILD_MODNAME,
1238         .id_table       = usb_ids,
1239         .probe          = probe,
1240         .disconnect     = disconnect,
1241 };
1242
1243 struct workqueue_struct *zd_workqueue;
1244
1245 static int __init usb_init(void)
1246 {
1247         int r;
1248
1249         pr_debug("%s usb_init()\n", driver.name);
1250
1251         zd_workqueue = create_singlethread_workqueue(driver.name);
1252         if (zd_workqueue == NULL) {
1253                 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1254                 return -ENOMEM;
1255         }
1256
1257         r = usb_register(&driver);
1258         if (r) {
1259                 destroy_workqueue(zd_workqueue);
1260                 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1261                        driver.name, r);
1262                 return r;
1263         }
1264
1265         pr_debug("%s initialized\n", driver.name);
1266         return 0;
1267 }
1268
1269 static void __exit usb_exit(void)
1270 {
1271         pr_debug("%s usb_exit()\n", driver.name);
1272         usb_deregister(&driver);
1273         destroy_workqueue(zd_workqueue);
1274 }
1275
1276 module_init(usb_init);
1277 module_exit(usb_exit);
1278
1279 static int usb_int_regs_length(unsigned int count)
1280 {
1281         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1282 }
1283
1284 static void prepare_read_regs_int(struct zd_usb *usb)
1285 {
1286         struct zd_usb_interrupt *intr = &usb->intr;
1287
1288         spin_lock_irq(&intr->lock);
1289         intr->read_regs_enabled = 1;
1290         INIT_COMPLETION(intr->read_regs.completion);
1291         spin_unlock_irq(&intr->lock);
1292 }
1293
1294 static void disable_read_regs_int(struct zd_usb *usb)
1295 {
1296         struct zd_usb_interrupt *intr = &usb->intr;
1297
1298         spin_lock_irq(&intr->lock);
1299         intr->read_regs_enabled = 0;
1300         spin_unlock_irq(&intr->lock);
1301 }
1302
1303 static int get_results(struct zd_usb *usb, u16 *values,
1304                        struct usb_req_read_regs *req, unsigned int count)
1305 {
1306         int r;
1307         int i;
1308         struct zd_usb_interrupt *intr = &usb->intr;
1309         struct read_regs_int *rr = &intr->read_regs;
1310         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1311
1312         spin_lock_irq(&intr->lock);
1313
1314         r = -EIO;
1315         /* The created block size seems to be larger than expected.
1316          * However results appear to be correct.
1317          */
1318         if (rr->length < usb_int_regs_length(count)) {
1319                 dev_dbg_f(zd_usb_dev(usb),
1320                          "error: actual length %d less than expected %d\n",
1321                          rr->length, usb_int_regs_length(count));
1322                 goto error_unlock;
1323         }
1324         if (rr->length > sizeof(rr->buffer)) {
1325                 dev_dbg_f(zd_usb_dev(usb),
1326                          "error: actual length %d exceeds buffer size %zu\n",
1327                          rr->length, sizeof(rr->buffer));
1328                 goto error_unlock;
1329         }
1330
1331         for (i = 0; i < count; i++) {
1332                 struct reg_data *rd = &regs->regs[i];
1333                 if (rd->addr != req->addr[i]) {
1334                         dev_dbg_f(zd_usb_dev(usb),
1335                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1336                                  le16_to_cpu(rd->addr),
1337                                  le16_to_cpu(req->addr[i]));
1338                         goto error_unlock;
1339                 }
1340                 values[i] = le16_to_cpu(rd->value);
1341         }
1342
1343         r = 0;
1344 error_unlock:
1345         spin_unlock_irq(&intr->lock);
1346         return r;
1347 }
1348
1349 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1350                      const zd_addr_t *addresses, unsigned int count)
1351 {
1352         int r;
1353         int i, req_len, actual_req_len;
1354         struct usb_device *udev;
1355         struct usb_req_read_regs *req = NULL;
1356         unsigned long timeout;
1357
1358         if (count < 1) {
1359                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1360                 return -EINVAL;
1361         }
1362         if (count > USB_MAX_IOREAD16_COUNT) {
1363                 dev_dbg_f(zd_usb_dev(usb),
1364                          "error: count %u exceeds possible max %u\n",
1365                          count, USB_MAX_IOREAD16_COUNT);
1366                 return -EINVAL;
1367         }
1368         if (in_atomic()) {
1369                 dev_dbg_f(zd_usb_dev(usb),
1370                          "error: io in atomic context not supported\n");
1371                 return -EWOULDBLOCK;
1372         }
1373         if (!usb_int_enabled(usb)) {
1374                 dev_dbg_f(zd_usb_dev(usb),
1375                           "error: usb interrupt not enabled\n");
1376                 return -EWOULDBLOCK;
1377         }
1378
1379         ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1380         BUILD_BUG_ON(sizeof(struct usb_req_read_regs) + USB_MAX_IOREAD16_COUNT *
1381                      sizeof(__le16) > sizeof(usb->req_buf));
1382         BUG_ON(sizeof(struct usb_req_read_regs) + count * sizeof(__le16) >
1383                sizeof(usb->req_buf));
1384
1385         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1386         req = (void *)usb->req_buf;
1387
1388         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1389         for (i = 0; i < count; i++)
1390                 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1391
1392         udev = zd_usb_to_usbdev(usb);
1393         prepare_read_regs_int(usb);
1394         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1395                          req, req_len, &actual_req_len, 1000 /* ms */);
1396         if (r) {
1397                 dev_dbg_f(zd_usb_dev(usb),
1398                         "error in usb_bulk_msg(). Error number %d\n", r);
1399                 goto error;
1400         }
1401         if (req_len != actual_req_len) {
1402                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1403                         " req_len %d != actual_req_len %d\n",
1404                         req_len, actual_req_len);
1405                 r = -EIO;
1406                 goto error;
1407         }
1408
1409         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1410                                               msecs_to_jiffies(1000));
1411         if (!timeout) {
1412                 disable_read_regs_int(usb);
1413                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1414                 r = -ETIMEDOUT;
1415                 goto error;
1416         }
1417
1418         r = get_results(usb, values, req, count);
1419 error:
1420         return r;
1421 }
1422
1423 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1424                       unsigned int count)
1425 {
1426         int r;
1427         struct usb_device *udev;
1428         struct usb_req_write_regs *req = NULL;
1429         int i, req_len, actual_req_len;
1430
1431         if (count == 0)
1432                 return 0;
1433         if (count > USB_MAX_IOWRITE16_COUNT) {
1434                 dev_dbg_f(zd_usb_dev(usb),
1435                         "error: count %u exceeds possible max %u\n",
1436                         count, USB_MAX_IOWRITE16_COUNT);
1437                 return -EINVAL;
1438         }
1439         if (in_atomic()) {
1440                 dev_dbg_f(zd_usb_dev(usb),
1441                         "error: io in atomic context not supported\n");
1442                 return -EWOULDBLOCK;
1443         }
1444
1445         ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1446         BUILD_BUG_ON(sizeof(struct usb_req_write_regs) +
1447                      USB_MAX_IOWRITE16_COUNT * sizeof(struct reg_data) >
1448                      sizeof(usb->req_buf));
1449         BUG_ON(sizeof(struct usb_req_write_regs) +
1450                count * sizeof(struct reg_data) >
1451                sizeof(usb->req_buf));
1452
1453         req_len = sizeof(struct usb_req_write_regs) +
1454                   count * sizeof(struct reg_data);
1455         req = (void *)usb->req_buf;
1456
1457         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1458         for (i = 0; i < count; i++) {
1459                 struct reg_data *rw  = &req->reg_writes[i];
1460                 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1461                 rw->value = cpu_to_le16(ioreqs[i].value);
1462         }
1463
1464         udev = zd_usb_to_usbdev(usb);
1465         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1466                          req, req_len, &actual_req_len, 1000 /* ms */);
1467         if (r) {
1468                 dev_dbg_f(zd_usb_dev(usb),
1469                         "error in usb_bulk_msg(). Error number %d\n", r);
1470                 goto error;
1471         }
1472         if (req_len != actual_req_len) {
1473                 dev_dbg_f(zd_usb_dev(usb),
1474                         "error in usb_bulk_msg()"
1475                         " req_len %d != actual_req_len %d\n",
1476                         req_len, actual_req_len);
1477                 r = -EIO;
1478                 goto error;
1479         }
1480
1481         /* FALL-THROUGH with r == 0 */
1482 error:
1483         return r;
1484 }
1485
1486 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1487 {
1488         int r;
1489         struct usb_device *udev;
1490         struct usb_req_rfwrite *req = NULL;
1491         int i, req_len, actual_req_len;
1492         u16 bit_value_template;
1493
1494         if (in_atomic()) {
1495                 dev_dbg_f(zd_usb_dev(usb),
1496                         "error: io in atomic context not supported\n");
1497                 return -EWOULDBLOCK;
1498         }
1499         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1500                 dev_dbg_f(zd_usb_dev(usb),
1501                         "error: bits %d are smaller than"
1502                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1503                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1504                 return -EINVAL;
1505         }
1506         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1507                 dev_dbg_f(zd_usb_dev(usb),
1508                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1509                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1510                 return -EINVAL;
1511         }
1512 #ifdef DEBUG
1513         if (value & (~0UL << bits)) {
1514                 dev_dbg_f(zd_usb_dev(usb),
1515                         "error: value %#09x has bits >= %d set\n",
1516                         value, bits);
1517                 return -EINVAL;
1518         }
1519 #endif /* DEBUG */
1520
1521         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1522
1523         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1524         if (r) {
1525                 dev_dbg_f(zd_usb_dev(usb),
1526                         "error %d: Couldn't read CR203\n", r);
1527                 return r;
1528         }
1529         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1530
1531         ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1532         BUILD_BUG_ON(sizeof(struct usb_req_rfwrite) +
1533                      USB_MAX_RFWRITE_BIT_COUNT * sizeof(__le16) >
1534                      sizeof(usb->req_buf));
1535         BUG_ON(sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16) >
1536                sizeof(usb->req_buf));
1537
1538         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1539         req = (void *)usb->req_buf;
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         return r;
1572 }