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, 0xab13), .driver_info = DEVICE_ZD1211 },
  59         { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 },
  60         { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
  61         { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
  62         { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
  63         { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
  64         /* ZD1211B */
  65         { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
  66         { USB_DEVICE(0x0409, 0x0248), .driver_info = DEVICE_ZD1211B },
  67         { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
  68         { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
  69         { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
  70         { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
  71         { USB_DEVICE(0x054c, 0x0257), .driver_info = DEVICE_ZD1211B },
  72         { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
  73         { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
  74         { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
  75         { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
  76         { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
  77         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  78         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211B },
  79         { USB_DEVICE(0x07fa, 0x1196), .driver_info = DEVICE_ZD1211B },
  80         { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
  81         { USB_DEVICE(0x083a, 0xe501), .driver_info = DEVICE_ZD1211B },
  82         { USB_DEVICE(0x083a, 0xe503), .driver_info = DEVICE_ZD1211B },
  83         { USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B },
  84         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  85         { USB_DEVICE(0x0ace, 0xb215), .driver_info = DEVICE_ZD1211B },
  86         { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
  87         { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
  88         { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
  89         { USB_DEVICE(0x0df6, 0x0036), .driver_info = DEVICE_ZD1211B },
  90         { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
  91         { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
  92         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  93         { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
  94         { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
  95         /* "Driverless" devices that need ejecting */
  96         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
  97         { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
  98         {}
  99 };
 100
 101 MODULE_LICENSE("GPL");
 102 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
 103 MODULE_AUTHOR("Ulrich Kunitz");
 104 MODULE_AUTHOR("Daniel Drake");
 105 MODULE_VERSION("1.0");
 106 MODULE_DEVICE_TABLE(usb, usb_ids);
 107
 108 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
 109 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
 110
 111 /* USB device initialization */
 112 static void int_urb_complete(struct urb *urb);
 113
 114 static int request_fw_file(
 115         const struct firmware **fw, const char *name, struct device *device)
 116 {
 117         int r;
 118
 119         dev_dbg_f(device, "fw name %s\n", name);
 120
 121         r = request_firmware(fw, name, device);
 122         if (r)
 123                 dev_err(device,
 124                        "Could not load firmware file %s. Error number %d\n",
 125                        name, r);
 126         return r;
 127 }
 128
 129 static inline u16 get_bcdDevice(const struct usb_device *udev)
 130 {
 131         return le16_to_cpu(udev->descriptor.bcdDevice);
 132 }
 133
 134 enum upload_code_flags {
 135         REBOOT = 1,
 136 };
 137
 138 /* Ensures that MAX_TRANSFER_SIZE is even. */
 139 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 140
 141 static int upload_code(struct usb_device *udev,
 142         const u8 *data, size_t size, u16 code_offset, int flags)
 143 {
 144         u8 *p;
 145         int r;
 146
 147         /* USB request blocks need "kmalloced" buffers.
 148          */
 149         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 150         if (!p) {
 151                 dev_err(&udev->dev, "out of memory\n");
 152                 r = -ENOMEM;
 153                 goto error;
 154         }
 155
 156         size &= ~1;
 157         while (size > 0) {
 158                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 159                         size : MAX_TRANSFER_SIZE;
 160
 161                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 162
 163                 memcpy(p, data, transfer_size);
 164                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 165                         USB_REQ_FIRMWARE_DOWNLOAD,
 166                         USB_DIR_OUT | USB_TYPE_VENDOR,
 167                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 168                 if (r < 0) {
 169                         dev_err(&udev->dev,
 170                                "USB control request for firmware upload"
 171                                " failed. Error number %d\n", r);
 172                         goto error;
 173                 }
 174                 transfer_size = r & ~1;
 175
 176                 size -= transfer_size;
 177                 data += transfer_size;
 178                 code_offset += transfer_size/sizeof(u16);
 179         }
 180
 181         if (flags & REBOOT) {
 182                 u8 ret;
 183
 184                 /* Use "DMA-aware" buffer. */
 185                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 186                         USB_REQ_FIRMWARE_CONFIRM,
 187                         USB_DIR_IN | USB_TYPE_VENDOR,
 188                         0, 0, p, sizeof(ret), 5000 /* ms */);
 189                 if (r != sizeof(ret)) {
 190                         dev_err(&udev->dev,
 191                                 "control request firmeware confirmation failed."
 192                                 " Return value %d\n", r);
 193                         if (r >= 0)
 194                                 r = -ENODEV;
 195                         goto error;
 196                 }
 197                 ret = p[0];
 198                 if (ret & 0x80) {
 199                         dev_err(&udev->dev,
 200                                 "Internal error while downloading."
 201                                 " Firmware confirm return value %#04x\n",
 202                                 (unsigned int)ret);
 203                         r = -ENODEV;
 204                         goto error;
 205                 }
 206                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 207                         (unsigned int)ret);
 208         }
 209
 210         r = 0;
 211 error:
 212         kfree(p);
 213         return r;
 214 }
 215
 216 static u16 get_word(const void *data, u16 offset)
 217 {
 218         const __le16 *p = data;
 219         return le16_to_cpu(p[offset]);
 220 }
 221
 222 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
 223                        const char* postfix)
 224 {
 225         scnprintf(buffer, size, "%s%s",
 226                 usb->is_zd1211b ?
 227                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 228                 postfix);
 229         return buffer;
 230 }
 231
 232 static int handle_version_mismatch(struct zd_usb *usb,
 233         const struct firmware *ub_fw)
 234 {
 235         struct usb_device *udev = zd_usb_to_usbdev(usb);
 236         const struct firmware *ur_fw = NULL;
 237         int offset;
 238         int r = 0;
 239         char fw_name[128];
 240
 241         r = request_fw_file(&ur_fw,
 242                 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
 243                 &udev->dev);
 244         if (r)
 245                 goto error;
 246
 247         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
 248         if (r)
 249                 goto error;
 250
 251         offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
 252         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
 253                 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
 254
 255         /* At this point, the vendor driver downloads the whole firmware
 256          * image, hacks around with version IDs, and uploads it again,
 257          * completely overwriting the boot code. We do not do this here as
 258          * it is not required on any tested devices, and it is suspected to
 259          * cause problems. */
 260 error:
 261         release_firmware(ur_fw);
 262         return r;
 263 }
 264
 265 static int upload_firmware(struct zd_usb *usb)
 266 {
 267         int r;
 268         u16 fw_bcdDevice;
 269         u16 bcdDevice;
 270         struct usb_device *udev = zd_usb_to_usbdev(usb);
 271         const struct firmware *ub_fw = NULL;
 272         const struct firmware *uph_fw = NULL;
 273         char fw_name[128];
 274
 275         bcdDevice = get_bcdDevice(udev);
 276
 277         r = request_fw_file(&ub_fw,
 278                 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
 279                 &udev->dev);
 280         if (r)
 281                 goto error;
 282
 283         fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
 284
 285         if (fw_bcdDevice != bcdDevice) {
 286                 dev_info(&udev->dev,
 287                         "firmware version %#06x and device bootcode version "
 288                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
 289                 if (bcdDevice <= 0x4313)
 290                         dev_warn(&udev->dev, "device has old bootcode, please "
 291                                 "report success or failure\n");
 292
 293                 r = handle_version_mismatch(usb, ub_fw);
 294                 if (r)
 295                         goto error;
 296         } else {
 297                 dev_dbg_f(&udev->dev,
 298                         "firmware device id %#06x is equal to the "
 299                         "actual device id\n", fw_bcdDevice);
 300         }
 301
 302
 303         r = request_fw_file(&uph_fw,
 304                 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
 305                 &udev->dev);
 306         if (r)
 307                 goto error;
 308
 309         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
 310         if (r) {
 311                 dev_err(&udev->dev,
 312                         "Could not upload firmware code uph. Error number %d\n",
 313                         r);
 314         }
 315
 316         /* FALL-THROUGH */
 317 error:
 318         release_firmware(ub_fw);
 319         release_firmware(uph_fw);
 320         return r;
 321 }
 322
 323 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ur");
 324 MODULE_FIRMWARE(FW_ZD1211_PREFIX "ur");
 325 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ub");
 326 MODULE_FIRMWARE(FW_ZD1211_PREFIX "ub");
 327 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "uphr");
 328 MODULE_FIRMWARE(FW_ZD1211_PREFIX "uphr");
 329
 330 /* Read data from device address space using "firmware interface" which does
 331  * not require firmware to be loaded. */
 332 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
 333 {
 334         int r;
 335         struct usb_device *udev = zd_usb_to_usbdev(usb);
 336         u8 *buf;
 337
 338         /* Use "DMA-aware" buffer. */
 339         buf = kmalloc(len, GFP_KERNEL);
 340         if (!buf)
 341                 return -ENOMEM;
 342         r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 343                 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
 344                 buf, len, 5000);
 345         if (r < 0) {
 346                 dev_err(&udev->dev,
 347                         "read over firmware interface failed: %d\n", r);
 348                 goto exit;
 349         } else if (r != len) {
 350                 dev_err(&udev->dev,
 351                         "incomplete read over firmware interface: %d/%d\n",
 352                         r, len);
 353                 r = -EIO;
 354                 goto exit;
 355         }
 356         r = 0;
 357         memcpy(data, buf, len);
 358 exit:
 359         kfree(buf);
 360         return r;
 361 }
 362
 363 #define urb_dev(urb) (&(urb)->dev->dev)
 364
 365 static inline void handle_regs_int(struct urb *urb)
 366 {
 367         struct zd_usb *usb = urb->context;
 368         struct zd_usb_interrupt *intr = &usb->intr;
 369         int len;
 370         u16 int_num;
 371
 372         ZD_ASSERT(in_interrupt());
 373         spin_lock(&intr->lock);
 374
 375         int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));
 376         if (int_num == CR_INTERRUPT) {
 377                 struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
 378                 memcpy(&mac->intr_buffer, urb->transfer_buffer,
 379                                 USB_MAX_EP_INT_BUFFER);
 380                 schedule_work(&mac->process_intr);
 381         } else if (intr->read_regs_enabled) {
 382                 intr->read_regs.length = len = urb->actual_length;
 383
 384                 if (len > sizeof(intr->read_regs.buffer))
 385                         len = sizeof(intr->read_regs.buffer);
 386                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 387                 intr->read_regs_enabled = 0;
 388                 complete(&intr->read_regs.completion);
 389                 goto out;
 390         }
 391
 392 out:
 393         spin_unlock(&intr->lock);
 394 }
 395
 396 static void int_urb_complete(struct urb *urb)
 397 {
 398         int r;
 399         struct usb_int_header *hdr;
 400
 401         switch (urb->status) {
 402         case 0:
 403                 break;
 404         case -ESHUTDOWN:
 405         case -EINVAL:
 406         case -ENODEV:
 407         case -ENOENT:
 408         case -ECONNRESET:
 409         case -EPIPE:
 410                 goto kfree;
 411         default:
 412                 goto resubmit;
 413         }
 414
 415         if (urb->actual_length < sizeof(hdr)) {
 416                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 417                 goto resubmit;
 418         }
 419
 420         hdr = urb->transfer_buffer;
 421         if (hdr->type != USB_INT_TYPE) {
 422                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 423                 goto resubmit;
 424         }
 425
 426         switch (hdr->id) {
 427         case USB_INT_ID_REGS:
 428                 handle_regs_int(urb);
 429                 break;
 430         case USB_INT_ID_RETRY_FAILED:
 431                 zd_mac_tx_failed(urb);
 432                 break;
 433         default:
 434                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 435                         (unsigned int)hdr->id);
 436                 goto resubmit;
 437         }
 438
 439 resubmit:
 440         r = usb_submit_urb(urb, GFP_ATOMIC);
 441         if (r) {
 442                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
 443                 goto kfree;
 444         }
 445         return;
 446 kfree:
 447         kfree(urb->transfer_buffer);
 448 }
 449
 450 static inline int int_urb_interval(struct usb_device *udev)
 451 {
 452         switch (udev->speed) {
 453         case USB_SPEED_HIGH:
 454                 return 4;
 455         case USB_SPEED_LOW:
 456                 return 10;
 457         case USB_SPEED_FULL:
 458         default:
 459                 return 1;
 460         }
 461 }
 462
 463 static inline int usb_int_enabled(struct zd_usb *usb)
 464 {
 465         unsigned long flags;
 466         struct zd_usb_interrupt *intr = &usb->intr;
 467         struct urb *urb;
 468
 469         spin_lock_irqsave(&intr->lock, flags);
 470         urb = intr->urb;
 471         spin_unlock_irqrestore(&intr->lock, flags);
 472         return urb != NULL;
 473 }
 474
 475 int zd_usb_enable_int(struct zd_usb *usb)
 476 {
 477         int r;
 478         struct usb_device *udev;
 479         struct zd_usb_interrupt *intr = &usb->intr;
 480         void *transfer_buffer = NULL;
 481         struct urb *urb;
 482
 483         dev_dbg_f(zd_usb_dev(usb), "\n");
 484
 485         urb = usb_alloc_urb(0, GFP_KERNEL);
 486         if (!urb) {
 487                 r = -ENOMEM;
 488                 goto out;
 489         }
 490
 491         ZD_ASSERT(!irqs_disabled());
 492         spin_lock_irq(&intr->lock);
 493         if (intr->urb) {
 494                 spin_unlock_irq(&intr->lock);
 495                 r = 0;
 496                 goto error_free_urb;
 497         }
 498         intr->urb = urb;
 499         spin_unlock_irq(&intr->lock);
 500
 501         /* TODO: make it a DMA buffer */
 502         r = -ENOMEM;
 503         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
 504         if (!transfer_buffer) {
 505                 dev_dbg_f(zd_usb_dev(usb),
 506                         "couldn't allocate transfer_buffer\n");
 507                 goto error_set_urb_null;
 508         }
 509
 510         udev = zd_usb_to_usbdev(usb);
 511         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 512                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
 513                          int_urb_complete, usb,
 514                          intr->interval);
 515
 516         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 517         r = usb_submit_urb(urb, GFP_KERNEL);
 518         if (r) {
 519                 dev_dbg_f(zd_usb_dev(usb),
 520                          "Couldn't submit urb. Error number %d\n", r);
 521                 goto error;
 522         }
 523
 524         return 0;
 525 error:
 526         kfree(transfer_buffer);
 527 error_set_urb_null:
 528         spin_lock_irq(&intr->lock);
 529         intr->urb = NULL;
 530         spin_unlock_irq(&intr->lock);
 531 error_free_urb:
 532         usb_free_urb(urb);
 533 out:
 534         return r;
 535 }
 536
 537 void zd_usb_disable_int(struct zd_usb *usb)
 538 {
 539         unsigned long flags;
 540         struct zd_usb_interrupt *intr = &usb->intr;
 541         struct urb *urb;
 542
 543         spin_lock_irqsave(&intr->lock, flags);
 544         urb = intr->urb;
 545         if (!urb) {
 546                 spin_unlock_irqrestore(&intr->lock, flags);
 547                 return;
 548         }
 549         intr->urb = NULL;
 550         spin_unlock_irqrestore(&intr->lock, flags);
 551
 552         usb_kill_urb(urb);
 553         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 554         usb_free_urb(urb);
 555 }
 556
 557 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 558                              unsigned int length)
 559 {
 560         int i;
 561         const struct rx_length_info *length_info;
 562
 563         if (length < sizeof(struct rx_length_info)) {
 564                 /* It's not a complete packet anyhow. */
 565                 printk("%s: invalid, small RX packet : %d\n",
 566                        __func__, length);
 567                 return;
 568         }
 569         length_info = (struct rx_length_info *)
 570                 (buffer + length - sizeof(struct rx_length_info));
 571
 572         /* It might be that three frames are merged into a single URB
 573          * transaction. We have to check for the length info tag.
 574          *
 575          * While testing we discovered that length_info might be unaligned,
 576          * because if USB transactions are merged, the last packet will not
 577          * be padded. Unaligned access might also happen if the length_info
 578          * structure is not present.
 579          */
 580         if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG)
 581         {
 582                 unsigned int l, k, n;
 583                 for (i = 0, l = 0;; i++) {
 584                         k = get_unaligned_le16(&length_info->length[i]);
 585                         if (k == 0)
 586                                 return;
 587                         n = l+k;
 588                         if (n > length)
 589                                 return;
 590                         zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
 591                         if (i >= 2)
 592                                 return;
 593                         l = (n+3) & ~3;
 594                 }
 595         } else {
 596                 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
 597         }
 598 }
 599
 600 static void rx_urb_complete(struct urb *urb)
 601 {
 602         struct zd_usb *usb;
 603         struct zd_usb_rx *rx;
 604         const u8 *buffer;
 605         unsigned int length;
 606
 607         switch (urb->status) {
 608         case 0:
 609                 break;
 610         case -ESHUTDOWN:
 611         case -EINVAL:
 612         case -ENODEV:
 613         case -ENOENT:
 614         case -ECONNRESET:
 615         case -EPIPE:
 616                 return;
 617         default:
 618                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 619                 goto resubmit;
 620         }
 621
 622         buffer = urb->transfer_buffer;
 623         length = urb->actual_length;
 624         usb = urb->context;
 625         rx = &usb->rx;
 626
 627         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 628                 /* If there is an old first fragment, we don't care. */
 629                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 630                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 631                 spin_lock(&rx->lock);
 632                 memcpy(rx->fragment, buffer, length);
 633                 rx->fragment_length = length;
 634                 spin_unlock(&rx->lock);
 635                 goto resubmit;
 636         }
 637
 638         spin_lock(&rx->lock);
 639         if (rx->fragment_length > 0) {
 640                 /* We are on a second fragment, we believe */
 641                 ZD_ASSERT(length + rx->fragment_length <=
 642                           ARRAY_SIZE(rx->fragment));
 643                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 644                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 645                 handle_rx_packet(usb, rx->fragment,
 646                                  rx->fragment_length + length);
 647                 rx->fragment_length = 0;
 648                 spin_unlock(&rx->lock);
 649         } else {
 650                 spin_unlock(&rx->lock);
 651                 handle_rx_packet(usb, buffer, length);
 652         }
 653
 654 resubmit:
 655         usb_submit_urb(urb, GFP_ATOMIC);
 656 }
 657
 658 static struct urb *alloc_rx_urb(struct zd_usb *usb)
 659 {
 660         struct usb_device *udev = zd_usb_to_usbdev(usb);
 661         struct urb *urb;
 662         void *buffer;
 663
 664         urb = usb_alloc_urb(0, GFP_KERNEL);
 665         if (!urb)
 666                 return NULL;
 667         buffer = usb_alloc_coherent(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
 668                                     &urb->transfer_dma);
 669         if (!buffer) {
 670                 usb_free_urb(urb);
 671                 return NULL;
 672         }
 673
 674         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 675                           buffer, USB_MAX_RX_SIZE,
 676                           rx_urb_complete, usb);
 677         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 678
 679         return urb;
 680 }
 681
 682 static void free_rx_urb(struct urb *urb)
 683 {
 684         if (!urb)
 685                 return;
 686         usb_free_coherent(urb->dev, urb->transfer_buffer_length,
 687                           urb->transfer_buffer, urb->transfer_dma);
 688         usb_free_urb(urb);
 689 }
 690
 691 int zd_usb_enable_rx(struct zd_usb *usb)
 692 {
 693         int i, r;
 694         struct zd_usb_rx *rx = &usb->rx;
 695         struct urb **urbs;
 696
 697         dev_dbg_f(zd_usb_dev(usb), "\n");
 698
 699         r = -ENOMEM;
 700         urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
 701         if (!urbs)
 702                 goto error;
 703         for (i = 0; i < RX_URBS_COUNT; i++) {
 704                 urbs[i] = alloc_rx_urb(usb);
 705                 if (!urbs[i])
 706                         goto error;
 707         }
 708
 709         ZD_ASSERT(!irqs_disabled());
 710         spin_lock_irq(&rx->lock);
 711         if (rx->urbs) {
 712                 spin_unlock_irq(&rx->lock);
 713                 r = 0;
 714                 goto error;
 715         }
 716         rx->urbs = urbs;
 717         rx->urbs_count = RX_URBS_COUNT;
 718         spin_unlock_irq(&rx->lock);
 719
 720         for (i = 0; i < RX_URBS_COUNT; i++) {
 721                 r = usb_submit_urb(urbs[i], GFP_KERNEL);
 722                 if (r)
 723                         goto error_submit;
 724         }
 725
 726         return 0;
 727 error_submit:
 728         for (i = 0; i < RX_URBS_COUNT; i++) {
 729                 usb_kill_urb(urbs[i]);
 730         }
 731         spin_lock_irq(&rx->lock);
 732         rx->urbs = NULL;
 733         rx->urbs_count = 0;
 734         spin_unlock_irq(&rx->lock);
 735 error:
 736         if (urbs) {
 737                 for (i = 0; i < RX_URBS_COUNT; i++)
 738                         free_rx_urb(urbs[i]);
 739         }
 740         return r;
 741 }
 742
 743 void zd_usb_disable_rx(struct zd_usb *usb)
 744 {
 745         int i;
 746         unsigned long flags;
 747         struct urb **urbs;
 748         unsigned int count;
 749         struct zd_usb_rx *rx = &usb->rx;
 750
 751         spin_lock_irqsave(&rx->lock, flags);
 752         urbs = rx->urbs;
 753         count = rx->urbs_count;
 754         spin_unlock_irqrestore(&rx->lock, flags);
 755         if (!urbs)
 756                 return;
 757
 758         for (i = 0; i < count; i++) {
 759                 usb_kill_urb(urbs[i]);
 760                 free_rx_urb(urbs[i]);
 761         }
 762         kfree(urbs);
 763
 764         spin_lock_irqsave(&rx->lock, flags);
 765         rx->urbs = NULL;
 766         rx->urbs_count = 0;
 767         spin_unlock_irqrestore(&rx->lock, flags);
 768 }
 769
 770 /**
 771  * zd_usb_disable_tx - disable transmission
 772  * @usb: the zd1211rw-private USB structure
 773  *
 774  * Frees all URBs in the free list and marks the transmission as disabled.
 775  */
 776 void zd_usb_disable_tx(struct zd_usb *usb)
 777 {
 778         struct zd_usb_tx *tx = &usb->tx;
 779         unsigned long flags;
 780         struct list_head *pos, *n;
 781
 782         spin_lock_irqsave(&tx->lock, flags);
 783         list_for_each_safe(pos, n, &tx->free_urb_list) {
 784                 list_del(pos);
 785                 usb_free_urb(list_entry(pos, struct urb, urb_list));
 786         }
 787         tx->enabled = 0;
 788         tx->submitted_urbs = 0;
 789         /* The stopped state is ignored, relying on ieee80211_wake_queues()
 790          * in a potentionally following zd_usb_enable_tx().
 791          */
 792         spin_unlock_irqrestore(&tx->lock, flags);
 793 }
 794
 795 /**
 796  * zd_usb_enable_tx - enables transmission
 797  * @usb: a &struct zd_usb pointer
 798  *
 799  * This function enables transmission and prepares the &zd_usb_tx data
 800  * structure.
 801  */
 802 void zd_usb_enable_tx(struct zd_usb *usb)
 803 {
 804         unsigned long flags;
 805         struct zd_usb_tx *tx = &usb->tx;
 806
 807         spin_lock_irqsave(&tx->lock, flags);
 808         tx->enabled = 1;
 809         tx->submitted_urbs = 0;
 810         ieee80211_wake_queues(zd_usb_to_hw(usb));
 811         tx->stopped = 0;
 812         spin_unlock_irqrestore(&tx->lock, flags);
 813 }
 814
 815 /**
 816  * alloc_tx_urb - provides an tx URB
 817  * @usb: a &struct zd_usb pointer
 818  *
 819  * Allocates a new URB. If possible takes the urb from the free list in
 820  * usb->tx.
 821  */
 822 static struct urb *alloc_tx_urb(struct zd_usb *usb)
 823 {
 824         struct zd_usb_tx *tx = &usb->tx;
 825         unsigned long flags;
 826         struct list_head *entry;
 827         struct urb *urb;
 828
 829         spin_lock_irqsave(&tx->lock, flags);
 830         if (list_empty(&tx->free_urb_list)) {
 831                 urb = usb_alloc_urb(0, GFP_ATOMIC);
 832                 goto out;
 833         }
 834         entry = tx->free_urb_list.next;
 835         list_del(entry);
 836         urb = list_entry(entry, struct urb, urb_list);
 837 out:
 838         spin_unlock_irqrestore(&tx->lock, flags);
 839         return urb;
 840 }
 841
 842 /**
 843  * free_tx_urb - frees a used tx URB
 844  * @usb: a &struct zd_usb pointer
 845  * @urb: URB to be freed
 846  *
 847  * Frees the the transmission URB, which means to put it on the free URB
 848  * list.
 849  */
 850 static void free_tx_urb(struct zd_usb *usb, struct urb *urb)
 851 {
 852         struct zd_usb_tx *tx = &usb->tx;
 853         unsigned long flags;
 854
 855         spin_lock_irqsave(&tx->lock, flags);
 856         if (!tx->enabled) {
 857                 usb_free_urb(urb);
 858                 goto out;
 859         }
 860         list_add(&urb->urb_list, &tx->free_urb_list);
 861 out:
 862         spin_unlock_irqrestore(&tx->lock, flags);
 863 }
 864
 865 static void tx_dec_submitted_urbs(struct zd_usb *usb)
 866 {
 867         struct zd_usb_tx *tx = &usb->tx;
 868         unsigned long flags;
 869
 870         spin_lock_irqsave(&tx->lock, flags);
 871         --tx->submitted_urbs;
 872         if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) {
 873                 ieee80211_wake_queues(zd_usb_to_hw(usb));
 874                 tx->stopped = 0;
 875         }
 876         spin_unlock_irqrestore(&tx->lock, flags);
 877 }
 878
 879 static void tx_inc_submitted_urbs(struct zd_usb *usb)
 880 {
 881         struct zd_usb_tx *tx = &usb->tx;
 882         unsigned long flags;
 883
 884         spin_lock_irqsave(&tx->lock, flags);
 885         ++tx->submitted_urbs;
 886         if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
 887                 ieee80211_stop_queues(zd_usb_to_hw(usb));
 888                 tx->stopped = 1;
 889         }
 890         spin_unlock_irqrestore(&tx->lock, flags);
 891 }
 892
 893 /**
 894  * tx_urb_complete - completes the execution of an URB
 895  * @urb: a URB
 896  *
 897  * This function is called if the URB has been transferred to a device or an
 898  * error has happened.
 899  */
 900 static void tx_urb_complete(struct urb *urb)
 901 {
 902         int r;
 903         struct sk_buff *skb;
 904         struct ieee80211_tx_info *info;
 905         struct zd_usb *usb;
 906
 907         switch (urb->status) {
 908         case 0:
 909                 break;
 910         case -ESHUTDOWN:
 911         case -EINVAL:
 912         case -ENODEV:
 913         case -ENOENT:
 914         case -ECONNRESET:
 915         case -EPIPE:
 916                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 917                 break;
 918         default:
 919                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 920                 goto resubmit;
 921         }
 922 free_urb:
 923         skb = (struct sk_buff *)urb->context;
 924         /*
 925          * grab 'usb' pointer before handing off the skb (since
 926          * it might be freed by zd_mac_tx_to_dev or mac80211)
 927          */
 928         info = IEEE80211_SKB_CB(skb);
 929         usb = &zd_hw_mac(info->rate_driver_data[0])->chip.usb;
 930         zd_mac_tx_to_dev(skb, urb->status);
 931         free_tx_urb(usb, urb);
 932         tx_dec_submitted_urbs(usb);
 933         return;
 934 resubmit:
 935         r = usb_submit_urb(urb, GFP_ATOMIC);
 936         if (r) {
 937                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 938                 goto free_urb;
 939         }
 940 }
 941
 942 /**
 943  * zd_usb_tx: initiates transfer of a frame of the device
 944  *
 945  * @usb: the zd1211rw-private USB structure
 946  * @skb: a &struct sk_buff pointer
 947  *
 948  * This function tranmits a frame to the device. It doesn't wait for
 949  * completion. The frame must contain the control set and have all the
 950  * control set information available.
 951  *
 952  * The function returns 0 if the transfer has been successfully initiated.
 953  */
 954 int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
 955 {
 956         int r;
 957         struct usb_device *udev = zd_usb_to_usbdev(usb);
 958         struct urb *urb;
 959
 960         urb = alloc_tx_urb(usb);
 961         if (!urb) {
 962                 r = -ENOMEM;
 963                 goto out;
 964         }
 965
 966         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 967                           skb->data, skb->len, tx_urb_complete, skb);
 968
 969         r = usb_submit_urb(urb, GFP_ATOMIC);
 970         if (r)
 971                 goto error;
 972         tx_inc_submitted_urbs(usb);
 973         return 0;
 974 error:
 975         free_tx_urb(usb, urb);
 976 out:
 977         return r;
 978 }
 979
 980 static inline void init_usb_interrupt(struct zd_usb *usb)
 981 {
 982         struct zd_usb_interrupt *intr = &usb->intr;
 983
 984         spin_lock_init(&intr->lock);
 985         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 986         init_completion(&intr->read_regs.completion);
 987         intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
 988 }
 989
 990 static inline void init_usb_rx(struct zd_usb *usb)
 991 {
 992         struct zd_usb_rx *rx = &usb->rx;
 993         spin_lock_init(&rx->lock);
 994         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 995                 rx->usb_packet_size = 512;
 996         } else {
 997                 rx->usb_packet_size = 64;
 998         }
 999         ZD_ASSERT(rx->fragment_length == 0);
1000 }
1001
1002 static inline void init_usb_tx(struct zd_usb *usb)
1003 {
1004         struct zd_usb_tx *tx = &usb->tx;
1005         spin_lock_init(&tx->lock);
1006         tx->enabled = 0;
1007         tx->stopped = 0;
1008         INIT_LIST_HEAD(&tx->free_urb_list);
1009         tx->submitted_urbs = 0;
1010 }
1011
1012 void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
1013                  struct usb_interface *intf)
1014 {
1015         memset(usb, 0, sizeof(*usb));
1016         usb->intf = usb_get_intf(intf);
1017         usb_set_intfdata(usb->intf, hw);
1018         init_usb_interrupt(usb);
1019         init_usb_tx(usb);
1020         init_usb_rx(usb);
1021 }
1022
1023 void zd_usb_clear(struct zd_usb *usb)
1024 {
1025         usb_set_intfdata(usb->intf, NULL);
1026         usb_put_intf(usb->intf);
1027         ZD_MEMCLEAR(usb, sizeof(*usb));
1028         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
1029 }
1030
1031 static const char *speed(enum usb_device_speed speed)
1032 {
1033         switch (speed) {
1034         case USB_SPEED_LOW:
1035                 return "low";
1036         case USB_SPEED_FULL:
1037                 return "full";
1038         case USB_SPEED_HIGH:
1039                 return "high";
1040         default:
1041                 return "unknown speed";
1042         }
1043 }
1044
1045 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
1046 {
1047         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1048                 le16_to_cpu(udev->descriptor.idVendor),
1049                 le16_to_cpu(udev->descriptor.idProduct),
1050                 get_bcdDevice(udev),
1051                 speed(udev->speed));
1052 }
1053
1054 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1055 {
1056         struct usb_device *udev = interface_to_usbdev(usb->intf);
1057         return scnprint_id(udev, buffer, size);
1058 }
1059
1060 #ifdef DEBUG
1061 static void print_id(struct usb_device *udev)
1062 {
1063         char buffer[40];
1064
1065         scnprint_id(udev, buffer, sizeof(buffer));
1066         buffer[sizeof(buffer)-1] = 0;
1067         dev_dbg_f(&udev->dev, "%s\n", buffer);
1068 }
1069 #else
1070 #define print_id(udev) do { } while (0)
1071 #endif
1072
1073 static int eject_installer(struct usb_interface *intf)
1074 {
1075         struct usb_device *udev = interface_to_usbdev(intf);
1076         struct usb_host_interface *iface_desc = &intf->altsetting[0];
1077         struct usb_endpoint_descriptor *endpoint;
1078         unsigned char *cmd;
1079         u8 bulk_out_ep;
1080         int r;
1081
1082         /* Find bulk out endpoint */
1083         for (r = 1; r >= 0; r--) {
1084                 endpoint = &iface_desc->endpoint[r].desc;
1085                 if (usb_endpoint_dir_out(endpoint) &&
1086                     usb_endpoint_xfer_bulk(endpoint)) {
1087                         bulk_out_ep = endpoint->bEndpointAddress;
1088                         break;
1089                 }
1090         }
1091         if (r == -1) {
1092                 dev_err(&udev->dev,
1093                         "zd1211rw: Could not find bulk out endpoint\n");
1094                 return -ENODEV;
1095         }
1096
1097         cmd = kzalloc(31, GFP_KERNEL);
1098         if (cmd == NULL)
1099                 return -ENODEV;
1100
1101         /* USB bulk command block */
1102         cmd[0] = 0x55;  /* bulk command signature */
1103         cmd[1] = 0x53;  /* bulk command signature */
1104         cmd[2] = 0x42;  /* bulk command signature */
1105         cmd[3] = 0x43;  /* bulk command signature */
1106         cmd[14] = 6;    /* command length */
1107
1108         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1109         cmd[19] = 0x2;  /* eject disc */
1110
1111         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1112         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1113                 cmd, 31, NULL, 2000);
1114         kfree(cmd);
1115         if (r)
1116                 return r;
1117
1118         /* At this point, the device disconnects and reconnects with the real
1119          * ID numbers. */
1120
1121         usb_set_intfdata(intf, NULL);
1122         return 0;
1123 }
1124
1125 int zd_usb_init_hw(struct zd_usb *usb)
1126 {
1127         int r;
1128         struct zd_mac *mac = zd_usb_to_mac(usb);
1129
1130         dev_dbg_f(zd_usb_dev(usb), "\n");
1131
1132         r = upload_firmware(usb);
1133         if (r) {
1134                 dev_err(zd_usb_dev(usb),
1135                        "couldn't load firmware. Error number %d\n", r);
1136                 return r;
1137         }
1138
1139         r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1140         if (r) {
1141                 dev_dbg_f(zd_usb_dev(usb),
1142                         "couldn't reset configuration. Error number %d\n", r);
1143                 return r;
1144         }
1145
1146         r = zd_mac_init_hw(mac->hw);
1147         if (r) {
1148                 dev_dbg_f(zd_usb_dev(usb),
1149                          "couldn't initialize mac. Error number %d\n", r);
1150                 return r;
1151         }
1152
1153         usb->initialized = 1;
1154         return 0;
1155 }
1156
1157 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1158 {
1159         int r;
1160         struct usb_device *udev = interface_to_usbdev(intf);
1161         struct zd_usb *usb;
1162         struct ieee80211_hw *hw = NULL;
1163
1164         print_id(udev);
1165
1166         if (id->driver_info & DEVICE_INSTALLER)
1167                 return eject_installer(intf);
1168
1169         switch (udev->speed) {
1170         case USB_SPEED_LOW:
1171         case USB_SPEED_FULL:
1172         case USB_SPEED_HIGH:
1173                 break;
1174         default:
1175                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1176                 r = -ENODEV;
1177                 goto error;
1178         }
1179
1180         r = usb_reset_device(udev);
1181         if (r) {
1182                 dev_err(&intf->dev,
1183                         "couldn't reset usb device. Error number %d\n", r);
1184                 goto error;
1185         }
1186
1187         hw = zd_mac_alloc_hw(intf);
1188         if (hw == NULL) {
1189                 r = -ENOMEM;
1190                 goto error;
1191         }
1192
1193         usb = &zd_hw_mac(hw)->chip.usb;
1194         usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1195
1196         r = zd_mac_preinit_hw(hw);
1197         if (r) {
1198                 dev_dbg_f(&intf->dev,
1199                          "couldn't initialize mac. Error number %d\n", r);
1200                 goto error;
1201         }
1202
1203         r = ieee80211_register_hw(hw);
1204         if (r) {
1205                 dev_dbg_f(&intf->dev,
1206                          "couldn't register device. Error number %d\n", r);
1207                 goto error;
1208         }
1209
1210         dev_dbg_f(&intf->dev, "successful\n");
1211         dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
1212         return 0;
1213 error:
1214         usb_reset_device(interface_to_usbdev(intf));
1215         if (hw) {
1216                 zd_mac_clear(zd_hw_mac(hw));
1217                 ieee80211_free_hw(hw);
1218         }
1219         return r;
1220 }
1221
1222 static void disconnect(struct usb_interface *intf)
1223 {
1224         struct ieee80211_hw *hw = zd_intf_to_hw(intf);
1225         struct zd_mac *mac;
1226         struct zd_usb *usb;
1227
1228         /* Either something really bad happened, or we're just dealing with
1229          * a DEVICE_INSTALLER. */
1230         if (hw == NULL)
1231                 return;
1232
1233         mac = zd_hw_mac(hw);
1234         usb = &mac->chip.usb;
1235
1236         dev_dbg_f(zd_usb_dev(usb), "\n");
1237
1238         ieee80211_unregister_hw(hw);
1239
1240         /* Just in case something has gone wrong! */
1241         zd_usb_disable_rx(usb);
1242         zd_usb_disable_int(usb);
1243
1244         /* If the disconnect has been caused by a removal of the
1245          * driver module, the reset allows reloading of the driver. If the
1246          * reset will not be executed here, the upload of the firmware in the
1247          * probe function caused by the reloading of the driver will fail.
1248          */
1249         usb_reset_device(interface_to_usbdev(intf));
1250
1251         zd_mac_clear(mac);
1252         ieee80211_free_hw(hw);
1253         dev_dbg(&intf->dev, "disconnected\n");
1254 }
1255
1256 static struct usb_driver driver = {
1257         .name           = KBUILD_MODNAME,
1258         .id_table       = usb_ids,
1259         .probe          = probe,
1260         .disconnect     = disconnect,
1261 };
1262
1263 struct workqueue_struct *zd_workqueue;
1264
1265 static int __init usb_init(void)
1266 {
1267         int r;
1268
1269         pr_debug("%s usb_init()\n", driver.name);
1270
1271         zd_workqueue = create_singlethread_workqueue(driver.name);
1272         if (zd_workqueue == NULL) {
1273                 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1274                 return -ENOMEM;
1275         }
1276
1277         r = usb_register(&driver);
1278         if (r) {
1279                 destroy_workqueue(zd_workqueue);
1280                 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1281                        driver.name, r);
1282                 return r;
1283         }
1284
1285         pr_debug("%s initialized\n", driver.name);
1286         return 0;
1287 }
1288
1289 static void __exit usb_exit(void)
1290 {
1291         pr_debug("%s usb_exit()\n", driver.name);
1292         usb_deregister(&driver);
1293         destroy_workqueue(zd_workqueue);
1294 }
1295
1296 module_init(usb_init);
1297 module_exit(usb_exit);
1298
1299 static int usb_int_regs_length(unsigned int count)
1300 {
1301         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1302 }
1303
1304 static void prepare_read_regs_int(struct zd_usb *usb)
1305 {
1306         struct zd_usb_interrupt *intr = &usb->intr;
1307
1308         spin_lock_irq(&intr->lock);
1309         intr->read_regs_enabled = 1;
1310         INIT_COMPLETION(intr->read_regs.completion);
1311         spin_unlock_irq(&intr->lock);
1312 }
1313
1314 static void disable_read_regs_int(struct zd_usb *usb)
1315 {
1316         struct zd_usb_interrupt *intr = &usb->intr;
1317
1318         spin_lock_irq(&intr->lock);
1319         intr->read_regs_enabled = 0;
1320         spin_unlock_irq(&intr->lock);
1321 }
1322
1323 static int get_results(struct zd_usb *usb, u16 *values,
1324                        struct usb_req_read_regs *req, unsigned int count)
1325 {
1326         int r;
1327         int i;
1328         struct zd_usb_interrupt *intr = &usb->intr;
1329         struct read_regs_int *rr = &intr->read_regs;
1330         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1331
1332         spin_lock_irq(&intr->lock);
1333
1334         r = -EIO;
1335         /* The created block size seems to be larger than expected.
1336          * However results appear to be correct.
1337          */
1338         if (rr->length < usb_int_regs_length(count)) {
1339                 dev_dbg_f(zd_usb_dev(usb),
1340                          "error: actual length %d less than expected %d\n",
1341                          rr->length, usb_int_regs_length(count));
1342                 goto error_unlock;
1343         }
1344         if (rr->length > sizeof(rr->buffer)) {
1345                 dev_dbg_f(zd_usb_dev(usb),
1346                          "error: actual length %d exceeds buffer size %zu\n",
1347                          rr->length, sizeof(rr->buffer));
1348                 goto error_unlock;
1349         }
1350
1351         for (i = 0; i < count; i++) {
1352                 struct reg_data *rd = &regs->regs[i];
1353                 if (rd->addr != req->addr[i]) {
1354                         dev_dbg_f(zd_usb_dev(usb),
1355                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1356                                  le16_to_cpu(rd->addr),
1357                                  le16_to_cpu(req->addr[i]));
1358                         goto error_unlock;
1359                 }
1360                 values[i] = le16_to_cpu(rd->value);
1361         }
1362
1363         r = 0;
1364 error_unlock:
1365         spin_unlock_irq(&intr->lock);
1366         return r;
1367 }
1368
1369 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1370                      const zd_addr_t *addresses, unsigned int count)
1371 {
1372         int r;
1373         int i, req_len, actual_req_len;
1374         struct usb_device *udev;
1375         struct usb_req_read_regs *req = NULL;
1376         unsigned long timeout;
1377
1378         if (count < 1) {
1379                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1380                 return -EINVAL;
1381         }
1382         if (count > USB_MAX_IOREAD16_COUNT) {
1383                 dev_dbg_f(zd_usb_dev(usb),
1384                          "error: count %u exceeds possible max %u\n",
1385                          count, USB_MAX_IOREAD16_COUNT);
1386                 return -EINVAL;
1387         }
1388         if (in_atomic()) {
1389                 dev_dbg_f(zd_usb_dev(usb),
1390                          "error: io in atomic context not supported\n");
1391                 return -EWOULDBLOCK;
1392         }
1393         if (!usb_int_enabled(usb)) {
1394                  dev_dbg_f(zd_usb_dev(usb),
1395                           "error: usb interrupt not enabled\n");
1396                 return -EWOULDBLOCK;
1397         }
1398
1399         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1400         req = kmalloc(req_len, GFP_KERNEL);
1401         if (!req)
1402                 return -ENOMEM;
1403         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1404         for (i = 0; i < count; i++)
1405                 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1406
1407         udev = zd_usb_to_usbdev(usb);
1408         prepare_read_regs_int(usb);
1409         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1410                          req, req_len, &actual_req_len, 1000 /* ms */);
1411         if (r) {
1412                 dev_dbg_f(zd_usb_dev(usb),
1413                         "error in usb_bulk_msg(). Error number %d\n", r);
1414                 goto error;
1415         }
1416         if (req_len != actual_req_len) {
1417                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1418                         " req_len %d != actual_req_len %d\n",
1419                         req_len, actual_req_len);
1420                 r = -EIO;
1421                 goto error;
1422         }
1423
1424         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1425                                               msecs_to_jiffies(1000));
1426         if (!timeout) {
1427                 disable_read_regs_int(usb);
1428                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1429                 r = -ETIMEDOUT;
1430                 goto error;
1431         }
1432
1433         r = get_results(usb, values, req, count);
1434 error:
1435         kfree(req);
1436         return r;
1437 }
1438
1439 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1440                       unsigned int count)
1441 {
1442         int r;
1443         struct usb_device *udev;
1444         struct usb_req_write_regs *req = NULL;
1445         int i, req_len, actual_req_len;
1446
1447         if (count == 0)
1448                 return 0;
1449         if (count > USB_MAX_IOWRITE16_COUNT) {
1450                 dev_dbg_f(zd_usb_dev(usb),
1451                         "error: count %u exceeds possible max %u\n",
1452                         count, USB_MAX_IOWRITE16_COUNT);
1453                 return -EINVAL;
1454         }
1455         if (in_atomic()) {
1456                 dev_dbg_f(zd_usb_dev(usb),
1457                         "error: io in atomic context not supported\n");
1458                 return -EWOULDBLOCK;
1459         }
1460
1461         req_len = sizeof(struct usb_req_write_regs) +
1462                   count * sizeof(struct reg_data);
1463         req = kmalloc(req_len, GFP_KERNEL);
1464         if (!req)
1465                 return -ENOMEM;
1466
1467         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1468         for (i = 0; i < count; i++) {
1469                 struct reg_data *rw  = &req->reg_writes[i];
1470                 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1471                 rw->value = cpu_to_le16(ioreqs[i].value);
1472         }
1473
1474         udev = zd_usb_to_usbdev(usb);
1475         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1476                          req, req_len, &actual_req_len, 1000 /* ms */);
1477         if (r) {
1478                 dev_dbg_f(zd_usb_dev(usb),
1479                         "error in usb_bulk_msg(). Error number %d\n", r);
1480                 goto error;
1481         }
1482         if (req_len != actual_req_len) {
1483                 dev_dbg_f(zd_usb_dev(usb),
1484                         "error in usb_bulk_msg()"
1485                         " req_len %d != actual_req_len %d\n",
1486                         req_len, actual_req_len);
1487                 r = -EIO;
1488                 goto error;
1489         }
1490
1491         /* FALL-THROUGH with r == 0 */
1492 error:
1493         kfree(req);
1494         return r;
1495 }
1496
1497 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1498 {
1499         int r;
1500         struct usb_device *udev;
1501         struct usb_req_rfwrite *req = NULL;
1502         int i, req_len, actual_req_len;
1503         u16 bit_value_template;
1504
1505         if (in_atomic()) {
1506                 dev_dbg_f(zd_usb_dev(usb),
1507                         "error: io in atomic context not supported\n");
1508                 return -EWOULDBLOCK;
1509         }
1510         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1511                 dev_dbg_f(zd_usb_dev(usb),
1512                         "error: bits %d are smaller than"
1513                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1514                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1515                 return -EINVAL;
1516         }
1517         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1518                 dev_dbg_f(zd_usb_dev(usb),
1519                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1520                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1521                 return -EINVAL;
1522         }
1523 #ifdef DEBUG
1524         if (value & (~0UL << bits)) {
1525                 dev_dbg_f(zd_usb_dev(usb),
1526                         "error: value %#09x has bits >= %d set\n",
1527                         value, bits);
1528                 return -EINVAL;
1529         }
1530 #endif /* DEBUG */
1531
1532         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1533
1534         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1535         if (r) {
1536                 dev_dbg_f(zd_usb_dev(usb),
1537                         "error %d: Couldn't read CR203\n", r);
1538                 goto out;
1539         }
1540         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1541
1542         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1543         req = kmalloc(req_len, GFP_KERNEL);
1544         if (!req)
1545                 return -ENOMEM;
1546
1547         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1548         /* 1: 3683a, but not used in ZYDAS driver */
1549         req->value = cpu_to_le16(2);
1550         req->bits = cpu_to_le16(bits);
1551
1552         for (i = 0; i < bits; i++) {
1553                 u16 bv = bit_value_template;
1554                 if (value & (1 << (bits-1-i)))
1555                         bv |= RF_DATA;
1556                 req->bit_values[i] = cpu_to_le16(bv);
1557         }
1558
1559         udev = zd_usb_to_usbdev(usb);
1560         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1561                          req, req_len, &actual_req_len, 1000 /* ms */);
1562         if (r) {
1563                 dev_dbg_f(zd_usb_dev(usb),
1564                         "error in usb_bulk_msg(). Error number %d\n", r);
1565                 goto out;
1566         }
1567         if (req_len != actual_req_len) {
1568                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1569                         " req_len %d != actual_req_len %d\n",
1570                         req_len, actual_req_len);
1571                 r = -EIO;
1572                 goto out;
1573         }
1574
1575         /* FALL-THROUGH with r == 0 */
1576 out:
1577         kfree(req);
1578         return r;
1579 }