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