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