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

   1 /* ZD1211 USB-WLAN driver for Linux
   2  *
   3  * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
   4  * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
   5  * Copyright (C) 2006-2007 Michael Wu <flamingice@sourmilk.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/init.h>
  24 #include <linux/firmware.h>
  25 #include <linux/device.h>
  26 #include <linux/errno.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/usb.h>
  29 #include <linux/workqueue.h>
  30 #include <net/mac80211.h>
  31 #include <asm/unaligned.h>
  32
  33 #include "zd_def.h"
  34 #include "zd_mac.h"
  35 #include "zd_usb.h"
  36
  37 static struct usb_device_id usb_ids[] = {
  38         /* ZD1211 */
  39         { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
  40         { USB_DEVICE(0x0ace, 0xa211), .driver_info = DEVICE_ZD1211 },
  41         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
  42         { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
  43         { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
  44         { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
  45         { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
  46         { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
  47         { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
  48         { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
  49         { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
  50         { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
  51         { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
  52         { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
  53         { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
  54         { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
  55         { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
  56         { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
  57         { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
  58         { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
  59         { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
  60         { USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 },
  61         { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 },
  62         { USB_DEVICE(0x0105, 0x145f), .driver_info = DEVICE_ZD1211 },
  63         /* ZD1211B */
  64         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  65         { USB_DEVICE(0x0ace, 0xb215), .driver_info = DEVICE_ZD1211B },
  66         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  67         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  68         { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
  69         { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
  70         { USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B },
  71         { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
  72         { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
  73         { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
  74         { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
  75         { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
  76         { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
  77         { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
  78         { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
  79         { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
  80         { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
  81         { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
  82         { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
  83         { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
  84         { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
  85         { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
  86         { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
  87         { USB_DEVICE(0x07fa, 0x1196), .driver_info = DEVICE_ZD1211B },
  88         { USB_DEVICE(0x0df6, 0x0036), .driver_info = DEVICE_ZD1211B },
  89         /* "Driverless" devices that need ejecting */
  90         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
  91         { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
  92         {}
  93 };
  94
  95 MODULE_LICENSE("GPL");
  96 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
  97 MODULE_AUTHOR("Ulrich Kunitz");
  98 MODULE_AUTHOR("Daniel Drake");
  99 MODULE_VERSION("1.0");
 100 MODULE_DEVICE_TABLE(usb, usb_ids);
 101
 102 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
 103 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
 104
 105 /* USB device initialization */
 106 static void int_urb_complete(struct urb *urb);
 107
 108 static int request_fw_file(
 109         const struct firmware **fw, const char *name, struct device *device)
 110 {
 111         int r;
 112
 113         dev_dbg_f(device, "fw name %s\n", name);
 114
 115         r = request_firmware(fw, name, device);
 116         if (r)
 117                 dev_err(device,
 118                        "Could not load firmware file %s. Error number %d\n",
 119                        name, r);
 120         return r;
 121 }
 122
 123 static inline u16 get_bcdDevice(const struct usb_device *udev)
 124 {
 125         return le16_to_cpu(udev->descriptor.bcdDevice);
 126 }
 127
 128 enum upload_code_flags {
 129         REBOOT = 1,
 130 };
 131
 132 /* Ensures that MAX_TRANSFER_SIZE is even. */
 133 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 134
 135 static int upload_code(struct usb_device *udev,
 136         const u8 *data, size_t size, u16 code_offset, int flags)
 137 {
 138         u8 *p;
 139         int r;
 140
 141         /* USB request blocks need "kmalloced" buffers.
 142          */
 143         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 144         if (!p) {
 145                 dev_err(&udev->dev, "out of memory\n");
 146                 r = -ENOMEM;
 147                 goto error;
 148         }
 149
 150         size &= ~1;
 151         while (size > 0) {
 152                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 153                         size : MAX_TRANSFER_SIZE;
 154
 155                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 156
 157                 memcpy(p, data, transfer_size);
 158                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 159                         USB_REQ_FIRMWARE_DOWNLOAD,
 160                         USB_DIR_OUT | USB_TYPE_VENDOR,
 161                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 162                 if (r < 0) {
 163                         dev_err(&udev->dev,
 164                                "USB control request for firmware upload"
 165                                " failed. Error number %d\n", r);
 166                         goto error;
 167                 }
 168                 transfer_size = r & ~1;
 169
 170                 size -= transfer_size;
 171                 data += transfer_size;
 172                 code_offset += transfer_size/sizeof(u16);
 173         }
 174
 175         if (flags & REBOOT) {
 176                 u8 ret;
 177
 178                 /* Use "DMA-aware" buffer. */
 179                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 180                         USB_REQ_FIRMWARE_CONFIRM,
 181                         USB_DIR_IN | USB_TYPE_VENDOR,
 182                         0, 0, p, sizeof(ret), 5000 /* ms */);
 183                 if (r != sizeof(ret)) {
 184                         dev_err(&udev->dev,
 185                                 "control request firmeware confirmation failed."
 186                                 " Return value %d\n", r);
 187                         if (r >= 0)
 188                                 r = -ENODEV;
 189                         goto error;
 190                 }
 191                 ret = p[0];
 192                 if (ret & 0x80) {
 193                         dev_err(&udev->dev,
 194                                 "Internal error while downloading."
 195                                 " Firmware confirm return value %#04x\n",
 196                                 (unsigned int)ret);
 197                         r = -ENODEV;
 198                         goto error;
 199                 }
 200                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 201                         (unsigned int)ret);
 202         }
 203
 204         r = 0;
 205 error:
 206         kfree(p);
 207         return r;
 208 }
 209
 210 static u16 get_word(const void *data, u16 offset)
 211 {
 212         const __le16 *p = data;
 213         return le16_to_cpu(p[offset]);
 214 }
 215
 216 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
 217                        const char* postfix)
 218 {
 219         scnprintf(buffer, size, "%s%s",
 220                 usb->is_zd1211b ?
 221                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 222                 postfix);
 223         return buffer;
 224 }
 225
 226 static int handle_version_mismatch(struct zd_usb *usb,
 227         const struct firmware *ub_fw)
 228 {
 229         struct usb_device *udev = zd_usb_to_usbdev(usb);
 230         const struct firmware *ur_fw = NULL;
 231         int offset;
 232         int r = 0;
 233         char fw_name[128];
 234
 235         r = request_fw_file(&ur_fw,
 236                 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
 237                 &udev->dev);
 238         if (r)
 239                 goto error;
 240
 241         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
 242         if (r)
 243                 goto error;
 244
 245         offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
 246         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
 247                 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
 248
 249         /* At this point, the vendor driver downloads the whole firmware
 250          * image, hacks around with version IDs, and uploads it again,
 251          * completely overwriting the boot code. We do not do this here as
 252          * it is not required on any tested devices, and it is suspected to
 253          * cause problems. */
 254 error:
 255         release_firmware(ur_fw);
 256         return r;
 257 }
 258
 259 static int upload_firmware(struct zd_usb *usb)
 260 {
 261         int r;
 262         u16 fw_bcdDevice;
 263         u16 bcdDevice;
 264         struct usb_device *udev = zd_usb_to_usbdev(usb);
 265         const struct firmware *ub_fw = NULL;
 266         const struct firmware *uph_fw = NULL;
 267         char fw_name[128];
 268
 269         bcdDevice = get_bcdDevice(udev);
 270
 271         r = request_fw_file(&ub_fw,
 272                 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
 273                 &udev->dev);
 274         if (r)
 275                 goto error;
 276
 277         fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
 278
 279         if (fw_bcdDevice != bcdDevice) {
 280                 dev_info(&udev->dev,
 281                         "firmware version %#06x and device bootcode version "
 282                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
 283                 if (bcdDevice <= 0x4313)
 284                         dev_warn(&udev->dev, "device has old bootcode, please "
 285                                 "report success or failure\n");
 286
 287                 r = handle_version_mismatch(usb, ub_fw);
 288                 if (r)
 289                         goto error;
 290         } else {
 291                 dev_dbg_f(&udev->dev,
 292                         "firmware device id %#06x is equal to the "
 293                         "actual device id\n", fw_bcdDevice);
 294         }
 295
 296
 297         r = request_fw_file(&uph_fw,
 298                 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
 299                 &udev->dev);
 300         if (r)
 301                 goto error;
 302
 303         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
 304         if (r) {
 305                 dev_err(&udev->dev,
 306                         "Could not upload firmware code uph. Error number %d\n",
 307                         r);
 308         }
 309
 310         /* FALL-THROUGH */
 311 error:
 312         release_firmware(ub_fw);
 313         release_firmware(uph_fw);
 314         return r;
 315 }
 316
 317 /* Read data from device address space using "firmware interface" which does
 318  * not require firmware to be loaded. */
 319 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
 320 {
 321         int r;
 322         struct usb_device *udev = zd_usb_to_usbdev(usb);
 323         u8 *buf;
 324
 325         /* Use "DMA-aware" buffer. */
 326         buf = kmalloc(len, GFP_KERNEL);
 327         if (!buf)
 328                 return -ENOMEM;
 329         r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 330                 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
 331                 buf, len, 5000);
 332         if (r < 0) {
 333                 dev_err(&udev->dev,
 334                         "read over firmware interface failed: %d\n", r);
 335                 goto exit;
 336         } else if (r != len) {
 337                 dev_err(&udev->dev,
 338                         "incomplete read over firmware interface: %d/%d\n",
 339                         r, len);
 340                 r = -EIO;
 341                 goto exit;
 342         }
 343         r = 0;
 344         memcpy(data, buf, len);
 345 exit:
 346         kfree(buf);
 347         return r;
 348 }
 349
 350 #define urb_dev(urb) (&(urb)->dev->dev)
 351
 352 static inline void handle_regs_int(struct urb *urb)
 353 {
 354         struct zd_usb *usb = urb->context;
 355         struct zd_usb_interrupt *intr = &usb->intr;
 356         int len;
 357         u16 int_num;
 358
 359         ZD_ASSERT(in_interrupt());
 360         spin_lock(&intr->lock);
 361
 362         int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));
 363         if (int_num == CR_INTERRUPT) {
 364                 struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
 365                 memcpy(&mac->intr_buffer, urb->transfer_buffer,
 366                                 USB_MAX_EP_INT_BUFFER);
 367                 schedule_work(&mac->process_intr);
 368         } else if (intr->read_regs_enabled) {
 369                 intr->read_regs.length = len = urb->actual_length;
 370
 371                 if (len > sizeof(intr->read_regs.buffer))
 372                         len = sizeof(intr->read_regs.buffer);
 373                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 374                 intr->read_regs_enabled = 0;
 375                 complete(&intr->read_regs.completion);
 376                 goto out;
 377         }
 378
 379 out:
 380         spin_unlock(&intr->lock);
 381 }
 382
 383 static void int_urb_complete(struct urb *urb)
 384 {
 385         int r;
 386         struct usb_int_header *hdr;
 387
 388         switch (urb->status) {
 389         case 0:
 390                 break;
 391         case -ESHUTDOWN:
 392         case -EINVAL:
 393         case -ENODEV:
 394         case -ENOENT:
 395         case -ECONNRESET:
 396         case -EPIPE:
 397                 goto kfree;
 398         default:
 399                 goto resubmit;
 400         }
 401
 402         if (urb->actual_length < sizeof(hdr)) {
 403                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 404                 goto resubmit;
 405         }
 406
 407         hdr = urb->transfer_buffer;
 408         if (hdr->type != USB_INT_TYPE) {
 409                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 410                 goto resubmit;
 411         }
 412
 413         switch (hdr->id) {
 414         case USB_INT_ID_REGS:
 415                 handle_regs_int(urb);
 416                 break;
 417         case USB_INT_ID_RETRY_FAILED:
 418                 zd_mac_tx_failed(zd_usb_to_hw(urb->context));
 419                 break;
 420         default:
 421                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 422                         (unsigned int)hdr->id);
 423                 goto resubmit;
 424         }
 425
 426 resubmit:
 427         r = usb_submit_urb(urb, GFP_ATOMIC);
 428         if (r) {
 429                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
 430                 goto kfree;
 431         }
 432         return;
 433 kfree:
 434         kfree(urb->transfer_buffer);
 435 }
 436
 437 static inline int int_urb_interval(struct usb_device *udev)
 438 {
 439         switch (udev->speed) {
 440         case USB_SPEED_HIGH:
 441                 return 4;
 442         case USB_SPEED_LOW:
 443                 return 10;
 444         case USB_SPEED_FULL:
 445         default:
 446                 return 1;
 447         }
 448 }
 449
 450 static inline int usb_int_enabled(struct zd_usb *usb)
 451 {
 452         unsigned long flags;
 453         struct zd_usb_interrupt *intr = &usb->intr;
 454         struct urb *urb;
 455
 456         spin_lock_irqsave(&intr->lock, flags);
 457         urb = intr->urb;
 458         spin_unlock_irqrestore(&intr->lock, flags);
 459         return urb != NULL;
 460 }
 461
 462 int zd_usb_enable_int(struct zd_usb *usb)
 463 {
 464         int r;
 465         struct usb_device *udev;
 466         struct zd_usb_interrupt *intr = &usb->intr;
 467         void *transfer_buffer = NULL;
 468         struct urb *urb;
 469
 470         dev_dbg_f(zd_usb_dev(usb), "\n");
 471
 472         urb = usb_alloc_urb(0, GFP_KERNEL);
 473         if (!urb) {
 474                 r = -ENOMEM;
 475                 goto out;
 476         }
 477
 478         ZD_ASSERT(!irqs_disabled());
 479         spin_lock_irq(&intr->lock);
 480         if (intr->urb) {
 481                 spin_unlock_irq(&intr->lock);
 482                 r = 0;
 483                 goto error_free_urb;
 484         }
 485         intr->urb = urb;
 486         spin_unlock_irq(&intr->lock);
 487
 488         /* TODO: make it a DMA buffer */
 489         r = -ENOMEM;
 490         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
 491         if (!transfer_buffer) {
 492                 dev_dbg_f(zd_usb_dev(usb),
 493                         "couldn't allocate transfer_buffer\n");
 494                 goto error_set_urb_null;
 495         }
 496
 497         udev = zd_usb_to_usbdev(usb);
 498         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 499                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
 500                          int_urb_complete, usb,
 501                          intr->interval);
 502
 503         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 504         r = usb_submit_urb(urb, GFP_KERNEL);
 505         if (r) {
 506                 dev_dbg_f(zd_usb_dev(usb),
 507                          "Couldn't submit urb. Error number %d\n", r);
 508                 goto error;
 509         }
 510
 511         return 0;
 512 error:
 513         kfree(transfer_buffer);
 514 error_set_urb_null:
 515         spin_lock_irq(&intr->lock);
 516         intr->urb = NULL;
 517         spin_unlock_irq(&intr->lock);
 518 error_free_urb:
 519         usb_free_urb(urb);
 520 out:
 521         return r;
 522 }
 523
 524 void zd_usb_disable_int(struct zd_usb *usb)
 525 {
 526         unsigned long flags;
 527         struct zd_usb_interrupt *intr = &usb->intr;
 528         struct urb *urb;
 529
 530         spin_lock_irqsave(&intr->lock, flags);
 531         urb = intr->urb;
 532         if (!urb) {
 533                 spin_unlock_irqrestore(&intr->lock, flags);
 534                 return;
 535         }
 536         intr->urb = NULL;
 537         spin_unlock_irqrestore(&intr->lock, flags);
 538
 539         usb_kill_urb(urb);
 540         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 541         usb_free_urb(urb);
 542 }
 543
 544 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 545                              unsigned int length)
 546 {
 547         int i;
 548         const struct rx_length_info *length_info;
 549
 550         if (length < sizeof(struct rx_length_info)) {
 551                 /* It's not a complete packet anyhow. */
 552                 return;
 553         }
 554         length_info = (struct rx_length_info *)
 555                 (buffer + length - sizeof(struct rx_length_info));
 556
 557         /* It might be that three frames are merged into a single URB
 558          * transaction. We have to check for the length info tag.
 559          *
 560          * While testing we discovered that length_info might be unaligned,
 561          * because if USB transactions are merged, the last packet will not
 562          * be padded. Unaligned access might also happen if the length_info
 563          * structure is not present.
 564          */
 565         if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG)
 566         {
 567                 unsigned int l, k, n;
 568                 for (i = 0, l = 0;; i++) {
 569                         k = get_unaligned_le16(&length_info->length[i]);
 570                         if (k == 0)
 571                                 return;
 572                         n = l+k;
 573                         if (n > length)
 574                                 return;
 575                         zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
 576                         if (i >= 2)
 577                                 return;
 578                         l = (n+3) & ~3;
 579                 }
 580         } else {
 581                 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
 582         }
 583 }
 584
 585 static void rx_urb_complete(struct urb *urb)
 586 {
 587         struct zd_usb *usb;
 588         struct zd_usb_rx *rx;
 589         const u8 *buffer;
 590         unsigned int length;
 591
 592         switch (urb->status) {
 593         case 0:
 594                 break;
 595         case -ESHUTDOWN:
 596         case -EINVAL:
 597         case -ENODEV:
 598         case -ENOENT:
 599         case -ECONNRESET:
 600         case -EPIPE:
 601                 return;
 602         default:
 603                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 604                 goto resubmit;
 605         }
 606
 607         buffer = urb->transfer_buffer;
 608         length = urb->actual_length;
 609         usb = urb->context;
 610         rx = &usb->rx;
 611
 612         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 613                 /* If there is an old first fragment, we don't care. */
 614                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 615                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 616                 spin_lock(&rx->lock);
 617                 memcpy(rx->fragment, buffer, length);
 618                 rx->fragment_length = length;
 619                 spin_unlock(&rx->lock);
 620                 goto resubmit;
 621         }
 622
 623         spin_lock(&rx->lock);
 624         if (rx->fragment_length > 0) {
 625                 /* We are on a second fragment, we believe */
 626                 ZD_ASSERT(length + rx->fragment_length <=
 627                           ARRAY_SIZE(rx->fragment));
 628                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 629                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 630                 handle_rx_packet(usb, rx->fragment,
 631                                  rx->fragment_length + length);
 632                 rx->fragment_length = 0;
 633                 spin_unlock(&rx->lock);
 634         } else {
 635                 spin_unlock(&rx->lock);
 636                 handle_rx_packet(usb, buffer, length);
 637         }
 638
 639 resubmit:
 640         usb_submit_urb(urb, GFP_ATOMIC);
 641 }
 642
 643 static struct urb *alloc_rx_urb(struct zd_usb *usb)
 644 {
 645         struct usb_device *udev = zd_usb_to_usbdev(usb);
 646         struct urb *urb;
 647         void *buffer;
 648
 649         urb = usb_alloc_urb(0, GFP_KERNEL);
 650         if (!urb)
 651                 return NULL;
 652         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
 653                                   &urb->transfer_dma);
 654         if (!buffer) {
 655                 usb_free_urb(urb);
 656                 return NULL;
 657         }
 658
 659         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 660                           buffer, USB_MAX_RX_SIZE,
 661                           rx_urb_complete, usb);
 662         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 663
 664         return urb;
 665 }
 666
 667 static void free_rx_urb(struct urb *urb)
 668 {
 669         if (!urb)
 670                 return;
 671         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 672                         urb->transfer_buffer, urb->transfer_dma);
 673         usb_free_urb(urb);
 674 }
 675
 676 int zd_usb_enable_rx(struct zd_usb *usb)
 677 {
 678         int i, r;
 679         struct zd_usb_rx *rx = &usb->rx;
 680         struct urb **urbs;
 681
 682         dev_dbg_f(zd_usb_dev(usb), "\n");
 683
 684         r = -ENOMEM;
 685         urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
 686         if (!urbs)
 687                 goto error;
 688         for (i = 0; i < RX_URBS_COUNT; i++) {
 689                 urbs[i] = alloc_rx_urb(usb);
 690                 if (!urbs[i])
 691                         goto error;
 692         }
 693
 694         ZD_ASSERT(!irqs_disabled());
 695         spin_lock_irq(&rx->lock);
 696         if (rx->urbs) {
 697                 spin_unlock_irq(&rx->lock);
 698                 r = 0;
 699                 goto error;
 700         }
 701         rx->urbs = urbs;
 702         rx->urbs_count = RX_URBS_COUNT;
 703         spin_unlock_irq(&rx->lock);
 704
 705         for (i = 0; i < RX_URBS_COUNT; i++) {
 706                 r = usb_submit_urb(urbs[i], GFP_KERNEL);
 707                 if (r)
 708                         goto error_submit;
 709         }
 710
 711         return 0;
 712 error_submit:
 713         for (i = 0; i < RX_URBS_COUNT; i++) {
 714                 usb_kill_urb(urbs[i]);
 715         }
 716         spin_lock_irq(&rx->lock);
 717         rx->urbs = NULL;
 718         rx->urbs_count = 0;
 719         spin_unlock_irq(&rx->lock);
 720 error:
 721         if (urbs) {
 722                 for (i = 0; i < RX_URBS_COUNT; i++)
 723                         free_rx_urb(urbs[i]);
 724         }
 725         return r;
 726 }
 727
 728 void zd_usb_disable_rx(struct zd_usb *usb)
 729 {
 730         int i;
 731         unsigned long flags;
 732         struct urb **urbs;
 733         unsigned int count;
 734         struct zd_usb_rx *rx = &usb->rx;
 735
 736         spin_lock_irqsave(&rx->lock, flags);
 737         urbs = rx->urbs;
 738         count = rx->urbs_count;
 739         spin_unlock_irqrestore(&rx->lock, flags);
 740         if (!urbs)
 741                 return;
 742
 743         for (i = 0; i < count; i++) {
 744                 usb_kill_urb(urbs[i]);
 745                 free_rx_urb(urbs[i]);
 746         }
 747         kfree(urbs);
 748
 749         spin_lock_irqsave(&rx->lock, flags);
 750         rx->urbs = NULL;
 751         rx->urbs_count = 0;
 752         spin_unlock_irqrestore(&rx->lock, flags);
 753 }
 754
 755 /**
 756  * zd_usb_disable_tx - disable transmission
 757  * @usb: the zd1211rw-private USB structure
 758  *
 759  * Frees all URBs in the free list and marks the transmission as disabled.
 760  */
 761 void zd_usb_disable_tx(struct zd_usb *usb)
 762 {
 763         struct zd_usb_tx *tx = &usb->tx;
 764         unsigned long flags;
 765         struct list_head *pos, *n;
 766
 767         spin_lock_irqsave(&tx->lock, flags);
 768         list_for_each_safe(pos, n, &tx->free_urb_list) {
 769                 list_del(pos);
 770                 usb_free_urb(list_entry(pos, struct urb, urb_list));
 771         }
 772         tx->enabled = 0;
 773         tx->submitted_urbs = 0;
 774         /* The stopped state is ignored, relying on ieee80211_wake_queues()
 775          * in a potentionally following zd_usb_enable_tx().
 776          */
 777         spin_unlock_irqrestore(&tx->lock, flags);
 778 }
 779
 780 /**
 781  * zd_usb_enable_tx - enables transmission
 782  * @usb: a &struct zd_usb pointer
 783  *
 784  * This function enables transmission and prepares the &zd_usb_tx data
 785  * structure.
 786  */
 787 void zd_usb_enable_tx(struct zd_usb *usb)
 788 {
 789         unsigned long flags;
 790         struct zd_usb_tx *tx = &usb->tx;
 791
 792         spin_lock_irqsave(&tx->lock, flags);
 793         tx->enabled = 1;
 794         tx->submitted_urbs = 0;
 795         ieee80211_wake_queues(zd_usb_to_hw(usb));
 796         tx->stopped = 0;
 797         spin_unlock_irqrestore(&tx->lock, flags);
 798 }
 799
 800 /**
 801  * alloc_tx_urb - provides an tx URB
 802  * @usb: a &struct zd_usb pointer
 803  *
 804  * Allocates a new URB. If possible takes the urb from the free list in
 805  * usb->tx.
 806  */
 807 static struct urb *alloc_tx_urb(struct zd_usb *usb)
 808 {
 809         struct zd_usb_tx *tx = &usb->tx;
 810         unsigned long flags;
 811         struct list_head *entry;
 812         struct urb *urb;
 813
 814         spin_lock_irqsave(&tx->lock, flags);
 815         if (list_empty(&tx->free_urb_list)) {
 816                 urb = usb_alloc_urb(0, GFP_ATOMIC);
 817                 goto out;
 818         }
 819         entry = tx->free_urb_list.next;
 820         list_del(entry);
 821         urb = list_entry(entry, struct urb, urb_list);
 822 out:
 823         spin_unlock_irqrestore(&tx->lock, flags);
 824         return urb;
 825 }
 826
 827 /**
 828  * free_tx_urb - frees a used tx URB
 829  * @usb: a &struct zd_usb pointer
 830  * @urb: URB to be freed
 831  *
 832  * Frees the the transmission URB, which means to put it on the free URB
 833  * list.
 834  */
 835 static void free_tx_urb(struct zd_usb *usb, struct urb *urb)
 836 {
 837         struct zd_usb_tx *tx = &usb->tx;
 838         unsigned long flags;
 839
 840         spin_lock_irqsave(&tx->lock, flags);
 841         if (!tx->enabled) {
 842                 usb_free_urb(urb);
 843                 goto out;
 844         }
 845         list_add(&urb->urb_list, &tx->free_urb_list);
 846 out:
 847         spin_unlock_irqrestore(&tx->lock, flags);
 848 }
 849
 850 static void tx_dec_submitted_urbs(struct zd_usb *usb)
 851 {
 852         struct zd_usb_tx *tx = &usb->tx;
 853         unsigned long flags;
 854
 855         spin_lock_irqsave(&tx->lock, flags);
 856         --tx->submitted_urbs;
 857         if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) {
 858                 ieee80211_wake_queues(zd_usb_to_hw(usb));
 859                 tx->stopped = 0;
 860         }
 861         spin_unlock_irqrestore(&tx->lock, flags);
 862 }
 863
 864 static void tx_inc_submitted_urbs(struct zd_usb *usb)
 865 {
 866         struct zd_usb_tx *tx = &usb->tx;
 867         unsigned long flags;
 868
 869         spin_lock_irqsave(&tx->lock, flags);
 870         ++tx->submitted_urbs;
 871         if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
 872                 ieee80211_stop_queues(zd_usb_to_hw(usb));
 873                 tx->stopped = 1;
 874         }
 875         spin_unlock_irqrestore(&tx->lock, flags);
 876 }
 877
 878 /**
 879  * tx_urb_complete - completes the execution of an URB
 880  * @urb: a URB
 881  *
 882  * This function is called if the URB has been transferred to a device or an
 883  * error has happened.
 884  */
 885 static void tx_urb_complete(struct urb *urb)
 886 {
 887         int r;
 888         struct sk_buff *skb;
 889         struct ieee80211_tx_info *info;
 890         struct zd_usb *usb;
 891
 892         switch (urb->status) {
 893         case 0:
 894                 break;
 895         case -ESHUTDOWN:
 896         case -EINVAL:
 897         case -ENODEV:
 898         case -ENOENT:
 899         case -ECONNRESET:
 900         case -EPIPE:
 901                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 902                 break;
 903         default:
 904                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 905                 goto resubmit;
 906         }
 907 free_urb:
 908         skb = (struct sk_buff *)urb->context;
 909         /*
 910          * grab 'usb' pointer before handing off the skb (since
 911          * it might be freed by zd_mac_tx_to_dev or mac80211)
 912          */
 913         info = IEEE80211_SKB_CB(skb);
 914         usb = &zd_hw_mac(info->rate_driver_data[0])->chip.usb;
 915         zd_mac_tx_to_dev(skb, urb->status);
 916         free_tx_urb(usb, urb);
 917         tx_dec_submitted_urbs(usb);
 918         return;
 919 resubmit:
 920         r = usb_submit_urb(urb, GFP_ATOMIC);
 921         if (r) {
 922                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 923                 goto free_urb;
 924         }
 925 }
 926
 927 /**
 928  * zd_usb_tx: initiates transfer of a frame of the device
 929  *
 930  * @usb: the zd1211rw-private USB structure
 931  * @skb: a &struct sk_buff pointer
 932  *
 933  * This function tranmits a frame to the device. It doesn't wait for
 934  * completion. The frame must contain the control set and have all the
 935  * control set information available.
 936  *
 937  * The function returns 0 if the transfer has been successfully initiated.
 938  */
 939 int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
 940 {
 941         int r;
 942         struct usb_device *udev = zd_usb_to_usbdev(usb);
 943         struct urb *urb;
 944
 945         urb = alloc_tx_urb(usb);
 946         if (!urb) {
 947                 r = -ENOMEM;
 948                 goto out;
 949         }
 950
 951         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 952                           skb->data, skb->len, tx_urb_complete, skb);
 953
 954         r = usb_submit_urb(urb, GFP_ATOMIC);
 955         if (r)
 956                 goto error;
 957         tx_inc_submitted_urbs(usb);
 958         return 0;
 959 error:
 960         free_tx_urb(usb, urb);
 961 out:
 962         return r;
 963 }
 964
 965 static inline void init_usb_interrupt(struct zd_usb *usb)
 966 {
 967         struct zd_usb_interrupt *intr = &usb->intr;
 968
 969         spin_lock_init(&intr->lock);
 970         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 971         init_completion(&intr->read_regs.completion);
 972         intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
 973 }
 974
 975 static inline void init_usb_rx(struct zd_usb *usb)
 976 {
 977         struct zd_usb_rx *rx = &usb->rx;
 978         spin_lock_init(&rx->lock);
 979         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 980                 rx->usb_packet_size = 512;
 981         } else {
 982                 rx->usb_packet_size = 64;
 983         }
 984         ZD_ASSERT(rx->fragment_length == 0);
 985 }
 986
 987 static inline void init_usb_tx(struct zd_usb *usb)
 988 {
 989         struct zd_usb_tx *tx = &usb->tx;
 990         spin_lock_init(&tx->lock);
 991         tx->enabled = 0;
 992         tx->stopped = 0;
 993         INIT_LIST_HEAD(&tx->free_urb_list);
 994         tx->submitted_urbs = 0;
 995 }
 996
 997 void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
 998                  struct usb_interface *intf)
 999 {
1000         memset(usb, 0, sizeof(*usb));
1001         usb->intf = usb_get_intf(intf);
1002         usb_set_intfdata(usb->intf, hw);
1003         init_usb_interrupt(usb);
1004         init_usb_tx(usb);
1005         init_usb_rx(usb);
1006 }
1007
1008 void zd_usb_clear(struct zd_usb *usb)
1009 {
1010         usb_set_intfdata(usb->intf, NULL);
1011         usb_put_intf(usb->intf);
1012         ZD_MEMCLEAR(usb, sizeof(*usb));
1013         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
1014 }
1015
1016 static const char *speed(enum usb_device_speed speed)
1017 {
1018         switch (speed) {
1019         case USB_SPEED_LOW:
1020                 return "low";
1021         case USB_SPEED_FULL:
1022                 return "full";
1023         case USB_SPEED_HIGH:
1024                 return "high";
1025         default:
1026                 return "unknown speed";
1027         }
1028 }
1029
1030 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
1031 {
1032         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1033                 le16_to_cpu(udev->descriptor.idVendor),
1034                 le16_to_cpu(udev->descriptor.idProduct),
1035                 get_bcdDevice(udev),
1036                 speed(udev->speed));
1037 }
1038
1039 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1040 {
1041         struct usb_device *udev = interface_to_usbdev(usb->intf);
1042         return scnprint_id(udev, buffer, size);
1043 }
1044
1045 #ifdef DEBUG
1046 static void print_id(struct usb_device *udev)
1047 {
1048         char buffer[40];
1049
1050         scnprint_id(udev, buffer, sizeof(buffer));
1051         buffer[sizeof(buffer)-1] = 0;
1052         dev_dbg_f(&udev->dev, "%s\n", buffer);
1053 }
1054 #else
1055 #define print_id(udev) do { } while (0)
1056 #endif
1057
1058 static int eject_installer(struct usb_interface *intf)
1059 {
1060         struct usb_device *udev = interface_to_usbdev(intf);
1061         struct usb_host_interface *iface_desc = &intf->altsetting[0];
1062         struct usb_endpoint_descriptor *endpoint;
1063         unsigned char *cmd;
1064         u8 bulk_out_ep;
1065         int r;
1066
1067         /* Find bulk out endpoint */
1068         endpoint = &iface_desc->endpoint[1].desc;
1069         if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
1070             usb_endpoint_xfer_bulk(endpoint)) {
1071                 bulk_out_ep = endpoint->bEndpointAddress;
1072         } else {
1073                 dev_err(&udev->dev,
1074                         "zd1211rw: Could not find bulk out endpoint\n");
1075                 return -ENODEV;
1076         }
1077
1078         cmd = kzalloc(31, GFP_KERNEL);
1079         if (cmd == NULL)
1080                 return -ENODEV;
1081
1082         /* USB bulk command block */
1083         cmd[0] = 0x55;  /* bulk command signature */
1084         cmd[1] = 0x53;  /* bulk command signature */
1085         cmd[2] = 0x42;  /* bulk command signature */
1086         cmd[3] = 0x43;  /* bulk command signature */
1087         cmd[14] = 6;    /* command length */
1088
1089         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1090         cmd[19] = 0x2;  /* eject disc */
1091
1092         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1093         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1094                 cmd, 31, NULL, 2000);
1095         kfree(cmd);
1096         if (r)
1097                 return r;
1098
1099         /* At this point, the device disconnects and reconnects with the real
1100          * ID numbers. */
1101
1102         usb_set_intfdata(intf, NULL);
1103         return 0;
1104 }
1105
1106 int zd_usb_init_hw(struct zd_usb *usb)
1107 {
1108         int r;
1109         struct zd_mac *mac = zd_usb_to_mac(usb);
1110
1111         dev_dbg_f(zd_usb_dev(usb), "\n");
1112
1113         r = upload_firmware(usb);
1114         if (r) {
1115                 dev_err(zd_usb_dev(usb),
1116                        "couldn't load firmware. Error number %d\n", r);
1117                 return r;
1118         }
1119
1120         r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1121         if (r) {
1122                 dev_dbg_f(zd_usb_dev(usb),
1123                         "couldn't reset configuration. Error number %d\n", r);
1124                 return r;
1125         }
1126
1127         r = zd_mac_init_hw(mac->hw);
1128         if (r) {
1129                 dev_dbg_f(zd_usb_dev(usb),
1130                          "couldn't initialize mac. Error number %d\n", r);
1131                 return r;
1132         }
1133
1134         usb->initialized = 1;
1135         return 0;
1136 }
1137
1138 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1139 {
1140         int r;
1141         struct usb_device *udev = interface_to_usbdev(intf);
1142         struct zd_usb *usb;
1143         struct ieee80211_hw *hw = NULL;
1144
1145         print_id(udev);
1146
1147         if (id->driver_info & DEVICE_INSTALLER)
1148                 return eject_installer(intf);
1149
1150         switch (udev->speed) {
1151         case USB_SPEED_LOW:
1152         case USB_SPEED_FULL:
1153         case USB_SPEED_HIGH:
1154                 break;
1155         default:
1156                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1157                 r = -ENODEV;
1158                 goto error;
1159         }
1160
1161         r = usb_reset_device(udev);
1162         if (r) {
1163                 dev_err(&intf->dev,
1164                         "couldn't reset usb device. Error number %d\n", r);
1165                 goto error;
1166         }
1167
1168         hw = zd_mac_alloc_hw(intf);
1169         if (hw == NULL) {
1170                 r = -ENOMEM;
1171                 goto error;
1172         }
1173
1174         usb = &zd_hw_mac(hw)->chip.usb;
1175         usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1176
1177         r = zd_mac_preinit_hw(hw);
1178         if (r) {
1179                 dev_dbg_f(&intf->dev,
1180                          "couldn't initialize mac. Error number %d\n", r);
1181                 goto error;
1182         }
1183
1184         r = ieee80211_register_hw(hw);
1185         if (r) {
1186                 dev_dbg_f(&intf->dev,
1187                          "couldn't register device. Error number %d\n", r);
1188                 goto error;
1189         }
1190
1191         dev_dbg_f(&intf->dev, "successful\n");
1192         dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
1193         return 0;
1194 error:
1195         usb_reset_device(interface_to_usbdev(intf));
1196         if (hw) {
1197                 zd_mac_clear(zd_hw_mac(hw));
1198                 ieee80211_free_hw(hw);
1199         }
1200         return r;
1201 }
1202
1203 static void disconnect(struct usb_interface *intf)
1204 {
1205         struct ieee80211_hw *hw = zd_intf_to_hw(intf);
1206         struct zd_mac *mac;
1207         struct zd_usb *usb;
1208
1209         /* Either something really bad happened, or we're just dealing with
1210          * a DEVICE_INSTALLER. */
1211         if (hw == NULL)
1212                 return;
1213
1214         mac = zd_hw_mac(hw);
1215         usb = &mac->chip.usb;
1216
1217         dev_dbg_f(zd_usb_dev(usb), "\n");
1218
1219         ieee80211_unregister_hw(hw);
1220
1221         /* Just in case something has gone wrong! */
1222         zd_usb_disable_rx(usb);
1223         zd_usb_disable_int(usb);
1224
1225         /* If the disconnect has been caused by a removal of the
1226          * driver module, the reset allows reloading of the driver. If the
1227          * reset will not be executed here, the upload of the firmware in the
1228          * probe function caused by the reloading of the driver will fail.
1229          */
1230         usb_reset_device(interface_to_usbdev(intf));
1231
1232         zd_mac_clear(mac);
1233         ieee80211_free_hw(hw);
1234         dev_dbg(&intf->dev, "disconnected\n");
1235 }
1236
1237 static struct usb_driver driver = {
1238         .name           = KBUILD_MODNAME,
1239         .id_table       = usb_ids,
1240         .probe          = probe,
1241         .disconnect     = disconnect,
1242 };
1243
1244 struct workqueue_struct *zd_workqueue;
1245
1246 static int __init usb_init(void)
1247 {
1248         int r;
1249
1250         pr_debug("%s usb_init()\n", driver.name);
1251
1252         zd_workqueue = create_singlethread_workqueue(driver.name);
1253         if (zd_workqueue == NULL) {
1254                 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1255                 return -ENOMEM;
1256         }
1257
1258         r = usb_register(&driver);
1259         if (r) {
1260                 destroy_workqueue(zd_workqueue);
1261                 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1262                        driver.name, r);
1263                 return r;
1264         }
1265
1266         pr_debug("%s initialized\n", driver.name);
1267         return 0;
1268 }
1269
1270 static void __exit usb_exit(void)
1271 {
1272         pr_debug("%s usb_exit()\n", driver.name);
1273         usb_deregister(&driver);
1274         destroy_workqueue(zd_workqueue);
1275 }
1276
1277 module_init(usb_init);
1278 module_exit(usb_exit);
1279
1280 static int usb_int_regs_length(unsigned int count)
1281 {
1282         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1283 }
1284
1285 static void prepare_read_regs_int(struct zd_usb *usb)
1286 {
1287         struct zd_usb_interrupt *intr = &usb->intr;
1288
1289         spin_lock_irq(&intr->lock);
1290         intr->read_regs_enabled = 1;
1291         INIT_COMPLETION(intr->read_regs.completion);
1292         spin_unlock_irq(&intr->lock);
1293 }
1294
1295 static void disable_read_regs_int(struct zd_usb *usb)
1296 {
1297         struct zd_usb_interrupt *intr = &usb->intr;
1298
1299         spin_lock_irq(&intr->lock);
1300         intr->read_regs_enabled = 0;
1301         spin_unlock_irq(&intr->lock);
1302 }
1303
1304 static int get_results(struct zd_usb *usb, u16 *values,
1305                        struct usb_req_read_regs *req, unsigned int count)
1306 {
1307         int r;
1308         int i;
1309         struct zd_usb_interrupt *intr = &usb->intr;
1310         struct read_regs_int *rr = &intr->read_regs;
1311         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1312
1313         spin_lock_irq(&intr->lock);
1314
1315         r = -EIO;
1316         /* The created block size seems to be larger than expected.
1317          * However results appear to be correct.
1318          */
1319         if (rr->length < usb_int_regs_length(count)) {
1320                 dev_dbg_f(zd_usb_dev(usb),
1321                          "error: actual length %d less than expected %d\n",
1322                          rr->length, usb_int_regs_length(count));
1323                 goto error_unlock;
1324         }
1325         if (rr->length > sizeof(rr->buffer)) {
1326                 dev_dbg_f(zd_usb_dev(usb),
1327                          "error: actual length %d exceeds buffer size %zu\n",
1328                          rr->length, sizeof(rr->buffer));
1329                 goto error_unlock;
1330         }
1331
1332         for (i = 0; i < count; i++) {
1333                 struct reg_data *rd = &regs->regs[i];
1334                 if (rd->addr != req->addr[i]) {
1335                         dev_dbg_f(zd_usb_dev(usb),
1336                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1337                                  le16_to_cpu(rd->addr),
1338                                  le16_to_cpu(req->addr[i]));
1339                         goto error_unlock;
1340                 }
1341                 values[i] = le16_to_cpu(rd->value);
1342         }
1343
1344         r = 0;
1345 error_unlock:
1346         spin_unlock_irq(&intr->lock);
1347         return r;
1348 }
1349
1350 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1351                      const zd_addr_t *addresses, unsigned int count)
1352 {
1353         int r;
1354         int i, req_len, actual_req_len;
1355         struct usb_device *udev;
1356         struct usb_req_read_regs *req = NULL;
1357         unsigned long timeout;
1358
1359         if (count < 1) {
1360                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1361                 return -EINVAL;
1362         }
1363         if (count > USB_MAX_IOREAD16_COUNT) {
1364                 dev_dbg_f(zd_usb_dev(usb),
1365                          "error: count %u exceeds possible max %u\n",
1366                          count, USB_MAX_IOREAD16_COUNT);
1367                 return -EINVAL;
1368         }
1369         if (in_atomic()) {
1370                 dev_dbg_f(zd_usb_dev(usb),
1371                          "error: io in atomic context not supported\n");
1372                 return -EWOULDBLOCK;
1373         }
1374         if (!usb_int_enabled(usb)) {
1375                  dev_dbg_f(zd_usb_dev(usb),
1376                           "error: usb interrupt not enabled\n");
1377                 return -EWOULDBLOCK;
1378         }
1379
1380         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1381         req = kmalloc(req_len, GFP_KERNEL);
1382         if (!req)
1383                 return -ENOMEM;
1384         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1385         for (i = 0; i < count; i++)
1386                 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1387
1388         udev = zd_usb_to_usbdev(usb);
1389         prepare_read_regs_int(usb);
1390         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1391                          req, req_len, &actual_req_len, 1000 /* ms */);
1392         if (r) {
1393                 dev_dbg_f(zd_usb_dev(usb),
1394                         "error in usb_bulk_msg(). Error number %d\n", r);
1395                 goto error;
1396         }
1397         if (req_len != actual_req_len) {
1398                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1399                         " req_len %d != actual_req_len %d\n",
1400                         req_len, actual_req_len);
1401                 r = -EIO;
1402                 goto error;
1403         }
1404
1405         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1406                                               msecs_to_jiffies(1000));
1407         if (!timeout) {
1408                 disable_read_regs_int(usb);
1409                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1410                 r = -ETIMEDOUT;
1411                 goto error;
1412         }
1413
1414         r = get_results(usb, values, req, count);
1415 error:
1416         kfree(req);
1417         return r;
1418 }
1419
1420 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1421                       unsigned int count)
1422 {
1423         int r;
1424         struct usb_device *udev;
1425         struct usb_req_write_regs *req = NULL;
1426         int i, req_len, actual_req_len;
1427
1428         if (count == 0)
1429                 return 0;
1430         if (count > USB_MAX_IOWRITE16_COUNT) {
1431                 dev_dbg_f(zd_usb_dev(usb),
1432                         "error: count %u exceeds possible max %u\n",
1433                         count, USB_MAX_IOWRITE16_COUNT);
1434                 return -EINVAL;
1435         }
1436         if (in_atomic()) {
1437                 dev_dbg_f(zd_usb_dev(usb),
1438                         "error: io in atomic context not supported\n");
1439                 return -EWOULDBLOCK;
1440         }
1441
1442         req_len = sizeof(struct usb_req_write_regs) +
1443                   count * sizeof(struct reg_data);
1444         req = kmalloc(req_len, GFP_KERNEL);
1445         if (!req)
1446                 return -ENOMEM;
1447
1448         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1449         for (i = 0; i < count; i++) {
1450                 struct reg_data *rw  = &req->reg_writes[i];
1451                 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1452                 rw->value = cpu_to_le16(ioreqs[i].value);
1453         }
1454
1455         udev = zd_usb_to_usbdev(usb);
1456         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1457                          req, req_len, &actual_req_len, 1000 /* ms */);
1458         if (r) {
1459                 dev_dbg_f(zd_usb_dev(usb),
1460                         "error in usb_bulk_msg(). Error number %d\n", r);
1461                 goto error;
1462         }
1463         if (req_len != actual_req_len) {
1464                 dev_dbg_f(zd_usb_dev(usb),
1465                         "error in usb_bulk_msg()"
1466                         " req_len %d != actual_req_len %d\n",
1467                         req_len, actual_req_len);
1468                 r = -EIO;
1469                 goto error;
1470         }
1471
1472         /* FALL-THROUGH with r == 0 */
1473 error:
1474         kfree(req);
1475         return r;
1476 }
1477
1478 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1479 {
1480         int r;
1481         struct usb_device *udev;
1482         struct usb_req_rfwrite *req = NULL;
1483         int i, req_len, actual_req_len;
1484         u16 bit_value_template;
1485
1486         if (in_atomic()) {
1487                 dev_dbg_f(zd_usb_dev(usb),
1488                         "error: io in atomic context not supported\n");
1489                 return -EWOULDBLOCK;
1490         }
1491         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1492                 dev_dbg_f(zd_usb_dev(usb),
1493                         "error: bits %d are smaller than"
1494                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1495                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1496                 return -EINVAL;
1497         }
1498         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1499                 dev_dbg_f(zd_usb_dev(usb),
1500                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1501                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1502                 return -EINVAL;
1503         }
1504 #ifdef DEBUG
1505         if (value & (~0UL << bits)) {
1506                 dev_dbg_f(zd_usb_dev(usb),
1507                         "error: value %#09x has bits >= %d set\n",
1508                         value, bits);
1509                 return -EINVAL;
1510         }
1511 #endif /* DEBUG */
1512
1513         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1514
1515         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1516         if (r) {
1517                 dev_dbg_f(zd_usb_dev(usb),
1518                         "error %d: Couldn't read CR203\n", r);
1519                 goto out;
1520         }
1521         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1522
1523         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1524         req = kmalloc(req_len, GFP_KERNEL);
1525         if (!req)
1526                 return -ENOMEM;
1527
1528         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1529         /* 1: 3683a, but not used in ZYDAS driver */
1530         req->value = cpu_to_le16(2);
1531         req->bits = cpu_to_le16(bits);
1532
1533         for (i = 0; i < bits; i++) {
1534                 u16 bv = bit_value_template;
1535                 if (value & (1 << (bits-1-i)))
1536                         bv |= RF_DATA;
1537                 req->bit_values[i] = cpu_to_le16(bv);
1538         }
1539
1540         udev = zd_usb_to_usbdev(usb);
1541         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1542                          req, req_len, &actual_req_len, 1000 /* ms */);
1543         if (r) {
1544                 dev_dbg_f(zd_usb_dev(usb),
1545                         "error in usb_bulk_msg(). Error number %d\n", r);
1546                 goto out;
1547         }
1548         if (req_len != actual_req_len) {
1549                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1550                         " req_len %d != actual_req_len %d\n",
1551                         req_len, actual_req_len);
1552                 r = -EIO;
1553                 goto out;
1554         }
1555
1556         /* FALL-THROUGH with r == 0 */
1557 out:
1558         kfree(req);
1559         return r;
1560 }