drivers/net/wireless/zd1211rw/zd_usb.c

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