drivers/net/wireless/zd1211rw/zd_usb.c

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