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/module.h>
  21 #include <linux/firmware.h>
  22 #include <linux/device.h>
  23 #include <linux/errno.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/usb.h>
  26 #include <linux/workqueue.h>
  27 #include <net/ieee80211.h>
  28 #include <asm/unaligned.h>
  29
  30 #include "zd_def.h"
  31 #include "zd_netdev.h"
  32 #include "zd_mac.h"
  33 #include "zd_usb.h"
  34 #include "zd_util.h"
  35
  36 static struct usb_device_id usb_ids[] = {
  37         /* ZD1211 */
  38         { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
  39         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
  40         { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
  41         { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
  42         { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
  43         { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
  44         { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
  45         { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
  46         { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
  47         { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
  48         { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
  49         { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
  50         { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
  51         { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
  52         { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
  53         { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
  54         { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
  55         { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
  56         { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
  57         { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
  58         /* ZD1211B */
  59         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  60         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  61         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  62         { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
  63         { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
  64         { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
  65         { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
  66         { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
  67         { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
  68         { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
  69         { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
  70         { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
  71         { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
  72         { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
  73         { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
  74         { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
  75         { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
  76         { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
  77         { USB_DEVICE(0x0cde, 0x001a), .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 inline void handle_retry_failed_int(struct urb *urb)
 355 {
 356         struct zd_usb *usb = urb->context;
 357         struct zd_mac *mac = zd_usb_to_mac(usb);
 358         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 359
 360         ieee->stats.tx_errors++;
 361         ieee->ieee_stats.tx_retry_limit_exceeded++;
 362         dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
 363 }
 364
 365
 366 static void int_urb_complete(struct urb *urb)
 367 {
 368         int r;
 369         struct usb_int_header *hdr;
 370
 371         switch (urb->status) {
 372         case 0:
 373                 break;
 374         case -ESHUTDOWN:
 375         case -EINVAL:
 376         case -ENODEV:
 377         case -ENOENT:
 378         case -ECONNRESET:
 379         case -EPIPE:
 380                 goto kfree;
 381         default:
 382                 goto resubmit;
 383         }
 384
 385         if (urb->actual_length < sizeof(hdr)) {
 386                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 387                 goto resubmit;
 388         }
 389
 390         hdr = urb->transfer_buffer;
 391         if (hdr->type != USB_INT_TYPE) {
 392                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 393                 goto resubmit;
 394         }
 395
 396         switch (hdr->id) {
 397         case USB_INT_ID_REGS:
 398                 handle_regs_int(urb);
 399                 break;
 400         case USB_INT_ID_RETRY_FAILED:
 401                 handle_retry_failed_int(urb);
 402                 break;
 403         default:
 404                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 405                         (unsigned int)hdr->id);
 406                 goto resubmit;
 407         }
 408
 409 resubmit:
 410         r = usb_submit_urb(urb, GFP_ATOMIC);
 411         if (r) {
 412                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
 413                 goto kfree;
 414         }
 415         return;
 416 kfree:
 417         kfree(urb->transfer_buffer);
 418 }
 419
 420 static inline int int_urb_interval(struct usb_device *udev)
 421 {
 422         switch (udev->speed) {
 423         case USB_SPEED_HIGH:
 424                 return 4;
 425         case USB_SPEED_LOW:
 426                 return 10;
 427         case USB_SPEED_FULL:
 428         default:
 429                 return 1;
 430         }
 431 }
 432
 433 static inline int usb_int_enabled(struct zd_usb *usb)
 434 {
 435         unsigned long flags;
 436         struct zd_usb_interrupt *intr = &usb->intr;
 437         struct urb *urb;
 438
 439         spin_lock_irqsave(&intr->lock, flags);
 440         urb = intr->urb;
 441         spin_unlock_irqrestore(&intr->lock, flags);
 442         return urb != NULL;
 443 }
 444
 445 int zd_usb_enable_int(struct zd_usb *usb)
 446 {
 447         int r;
 448         struct usb_device *udev;
 449         struct zd_usb_interrupt *intr = &usb->intr;
 450         void *transfer_buffer = NULL;
 451         struct urb *urb;
 452
 453         dev_dbg_f(zd_usb_dev(usb), "\n");
 454
 455         urb = usb_alloc_urb(0, GFP_KERNEL);
 456         if (!urb) {
 457                 r = -ENOMEM;
 458                 goto out;
 459         }
 460
 461         ZD_ASSERT(!irqs_disabled());
 462         spin_lock_irq(&intr->lock);
 463         if (intr->urb) {
 464                 spin_unlock_irq(&intr->lock);
 465                 r = 0;
 466                 goto error_free_urb;
 467         }
 468         intr->urb = urb;
 469         spin_unlock_irq(&intr->lock);
 470
 471         /* TODO: make it a DMA buffer */
 472         r = -ENOMEM;
 473         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
 474         if (!transfer_buffer) {
 475                 dev_dbg_f(zd_usb_dev(usb),
 476                         "couldn't allocate transfer_buffer\n");
 477                 goto error_set_urb_null;
 478         }
 479
 480         udev = zd_usb_to_usbdev(usb);
 481         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 482                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
 483                          int_urb_complete, usb,
 484                          intr->interval);
 485
 486         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 487         r = usb_submit_urb(urb, GFP_KERNEL);
 488         if (r) {
 489                 dev_dbg_f(zd_usb_dev(usb),
 490                          "Couldn't submit urb. Error number %d\n", r);
 491                 goto error;
 492         }
 493
 494         return 0;
 495 error:
 496         kfree(transfer_buffer);
 497 error_set_urb_null:
 498         spin_lock_irq(&intr->lock);
 499         intr->urb = NULL;
 500         spin_unlock_irq(&intr->lock);
 501 error_free_urb:
 502         usb_free_urb(urb);
 503 out:
 504         return r;
 505 }
 506
 507 void zd_usb_disable_int(struct zd_usb *usb)
 508 {
 509         unsigned long flags;
 510         struct zd_usb_interrupt *intr = &usb->intr;
 511         struct urb *urb;
 512
 513         spin_lock_irqsave(&intr->lock, flags);
 514         urb = intr->urb;
 515         if (!urb) {
 516                 spin_unlock_irqrestore(&intr->lock, flags);
 517                 return;
 518         }
 519         intr->urb = NULL;
 520         spin_unlock_irqrestore(&intr->lock, flags);
 521
 522         usb_kill_urb(urb);
 523         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 524         usb_free_urb(urb);
 525 }
 526
 527 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 528                              unsigned int length)
 529 {
 530         int i;
 531         struct zd_mac *mac = zd_usb_to_mac(usb);
 532         const struct rx_length_info *length_info;
 533
 534         if (length < sizeof(struct rx_length_info)) {
 535                 /* It's not a complete packet anyhow. */
 536                 struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 537                 ieee->stats.rx_errors++;
 538                 ieee->stats.rx_length_errors++;
 539                 return;
 540         }
 541         length_info = (struct rx_length_info *)
 542                 (buffer + length - sizeof(struct rx_length_info));
 543
 544         /* It might be that three frames are merged into a single URB
 545          * transaction. We have to check for the length info tag.
 546          *
 547          * While testing we discovered that length_info might be unaligned,
 548          * because if USB transactions are merged, the last packet will not
 549          * be padded. Unaligned access might also happen if the length_info
 550          * structure is not present.
 551          */
 552         if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
 553         {
 554                 unsigned int l, k, n;
 555                 for (i = 0, l = 0;; i++) {
 556                         k = le16_to_cpu(get_unaligned(&length_info->length[i]));
 557                         if (k == 0)
 558                                 return;
 559                         n = l+k;
 560                         if (n > length)
 561                                 return;
 562                         zd_mac_rx_irq(mac, buffer+l, k);
 563                         if (i >= 2)
 564                                 return;
 565                         l = (n+3) & ~3;
 566                 }
 567         } else {
 568                 zd_mac_rx_irq(mac, buffer, length);
 569         }
 570 }
 571
 572 static void rx_urb_complete(struct urb *urb)
 573 {
 574         struct zd_usb *usb;
 575         struct zd_usb_rx *rx;
 576         const u8 *buffer;
 577         unsigned int length;
 578
 579         switch (urb->status) {
 580         case 0:
 581                 break;
 582         case -ESHUTDOWN:
 583         case -EINVAL:
 584         case -ENODEV:
 585         case -ENOENT:
 586         case -ECONNRESET:
 587         case -EPIPE:
 588                 return;
 589         default:
 590                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 591                 goto resubmit;
 592         }
 593
 594         buffer = urb->transfer_buffer;
 595         length = urb->actual_length;
 596         usb = urb->context;
 597         rx = &usb->rx;
 598
 599         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 600                 /* If there is an old first fragment, we don't care. */
 601                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 602                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 603                 spin_lock(&rx->lock);
 604                 memcpy(rx->fragment, buffer, length);
 605                 rx->fragment_length = length;
 606                 spin_unlock(&rx->lock);
 607                 goto resubmit;
 608         }
 609
 610         spin_lock(&rx->lock);
 611         if (rx->fragment_length > 0) {
 612                 /* We are on a second fragment, we believe */
 613                 ZD_ASSERT(length + rx->fragment_length <=
 614                           ARRAY_SIZE(rx->fragment));
 615                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 616                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 617                 handle_rx_packet(usb, rx->fragment,
 618                                  rx->fragment_length + length);
 619                 rx->fragment_length = 0;
 620                 spin_unlock(&rx->lock);
 621         } else {
 622                 spin_unlock(&rx->lock);
 623                 handle_rx_packet(usb, buffer, length);
 624         }
 625
 626 resubmit:
 627         usb_submit_urb(urb, GFP_ATOMIC);
 628 }
 629
 630 static struct urb *alloc_urb(struct zd_usb *usb)
 631 {
 632         struct usb_device *udev = zd_usb_to_usbdev(usb);
 633         struct urb *urb;
 634         void *buffer;
 635
 636         urb = usb_alloc_urb(0, GFP_KERNEL);
 637         if (!urb)
 638                 return NULL;
 639         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
 640                                   &urb->transfer_dma);
 641         if (!buffer) {
 642                 usb_free_urb(urb);
 643                 return NULL;
 644         }
 645
 646         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 647                           buffer, USB_MAX_RX_SIZE,
 648                           rx_urb_complete, usb);
 649         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 650
 651         return urb;
 652 }
 653
 654 static void free_urb(struct urb *urb)
 655 {
 656         if (!urb)
 657                 return;
 658         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 659                         urb->transfer_buffer, urb->transfer_dma);
 660         usb_free_urb(urb);
 661 }
 662
 663 int zd_usb_enable_rx(struct zd_usb *usb)
 664 {
 665         int i, r;
 666         struct zd_usb_rx *rx = &usb->rx;
 667         struct urb **urbs;
 668
 669         dev_dbg_f(zd_usb_dev(usb), "\n");
 670
 671         r = -ENOMEM;
 672         urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
 673         if (!urbs)
 674                 goto error;
 675         for (i = 0; i < URBS_COUNT; i++) {
 676                 urbs[i] = alloc_urb(usb);
 677                 if (!urbs[i])
 678                         goto error;
 679         }
 680
 681         ZD_ASSERT(!irqs_disabled());
 682         spin_lock_irq(&rx->lock);
 683         if (rx->urbs) {
 684                 spin_unlock_irq(&rx->lock);
 685                 r = 0;
 686                 goto error;
 687         }
 688         rx->urbs = urbs;
 689         rx->urbs_count = URBS_COUNT;
 690         spin_unlock_irq(&rx->lock);
 691
 692         for (i = 0; i < URBS_COUNT; i++) {
 693                 r = usb_submit_urb(urbs[i], GFP_KERNEL);
 694                 if (r)
 695                         goto error_submit;
 696         }
 697
 698         return 0;
 699 error_submit:
 700         for (i = 0; i < URBS_COUNT; i++) {
 701                 usb_kill_urb(urbs[i]);
 702         }
 703         spin_lock_irq(&rx->lock);
 704         rx->urbs = NULL;
 705         rx->urbs_count = 0;
 706         spin_unlock_irq(&rx->lock);
 707 error:
 708         if (urbs) {
 709                 for (i = 0; i < URBS_COUNT; i++)
 710                         free_urb(urbs[i]);
 711         }
 712         return r;
 713 }
 714
 715 void zd_usb_disable_rx(struct zd_usb *usb)
 716 {
 717         int i;
 718         unsigned long flags;
 719         struct urb **urbs;
 720         unsigned int count;
 721         struct zd_usb_rx *rx = &usb->rx;
 722
 723         spin_lock_irqsave(&rx->lock, flags);
 724         urbs = rx->urbs;
 725         count = rx->urbs_count;
 726         spin_unlock_irqrestore(&rx->lock, flags);
 727         if (!urbs)
 728                 return;
 729
 730         for (i = 0; i < count; i++) {
 731                 usb_kill_urb(urbs[i]);
 732                 free_urb(urbs[i]);
 733         }
 734         kfree(urbs);
 735
 736         spin_lock_irqsave(&rx->lock, flags);
 737         rx->urbs = NULL;
 738         rx->urbs_count = 0;
 739         spin_unlock_irqrestore(&rx->lock, flags);
 740 }
 741
 742 static void tx_urb_complete(struct urb *urb)
 743 {
 744         int r;
 745
 746         switch (urb->status) {
 747         case 0:
 748                 break;
 749         case -ESHUTDOWN:
 750         case -EINVAL:
 751         case -ENODEV:
 752         case -ENOENT:
 753         case -ECONNRESET:
 754         case -EPIPE:
 755                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 756                 break;
 757         default:
 758                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 759                 goto resubmit;
 760         }
 761 free_urb:
 762         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 763                         urb->transfer_buffer, urb->transfer_dma);
 764         usb_free_urb(urb);
 765         return;
 766 resubmit:
 767         r = usb_submit_urb(urb, GFP_ATOMIC);
 768         if (r) {
 769                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 770                 goto free_urb;
 771         }
 772 }
 773
 774 /* Puts the frame on the USB endpoint. It doesn't wait for
 775  * completion. The frame must contain the control set.
 776  */
 777 int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
 778 {
 779         int r;
 780         struct usb_device *udev = zd_usb_to_usbdev(usb);
 781         struct urb *urb;
 782         void *buffer;
 783
 784         urb = usb_alloc_urb(0, GFP_ATOMIC);
 785         if (!urb) {
 786                 r = -ENOMEM;
 787                 goto out;
 788         }
 789
 790         buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
 791                                   &urb->transfer_dma);
 792         if (!buffer) {
 793                 r = -ENOMEM;
 794                 goto error_free_urb;
 795         }
 796         memcpy(buffer, frame, length);
 797
 798         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 799                           buffer, length, tx_urb_complete, NULL);
 800         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 801
 802         r = usb_submit_urb(urb, GFP_ATOMIC);
 803         if (r)
 804                 goto error;
 805         return 0;
 806 error:
 807         usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
 808                         urb->transfer_dma);
 809 error_free_urb:
 810         usb_free_urb(urb);
 811 out:
 812         return r;
 813 }
 814
 815 static inline void init_usb_interrupt(struct zd_usb *usb)
 816 {
 817         struct zd_usb_interrupt *intr = &usb->intr;
 818
 819         spin_lock_init(&intr->lock);
 820         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 821         init_completion(&intr->read_regs.completion);
 822         intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
 823 }
 824
 825 static inline void init_usb_rx(struct zd_usb *usb)
 826 {
 827         struct zd_usb_rx *rx = &usb->rx;
 828         spin_lock_init(&rx->lock);
 829         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 830                 rx->usb_packet_size = 512;
 831         } else {
 832                 rx->usb_packet_size = 64;
 833         }
 834         ZD_ASSERT(rx->fragment_length == 0);
 835 }
 836
 837 static inline void init_usb_tx(struct zd_usb *usb)
 838 {
 839         /* FIXME: at this point we will allocate a fixed number of urb's for
 840          * use in a cyclic scheme */
 841 }
 842
 843 void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
 844                  struct usb_interface *intf)
 845 {
 846         memset(usb, 0, sizeof(*usb));
 847         usb->intf = usb_get_intf(intf);
 848         usb_set_intfdata(usb->intf, netdev);
 849         init_usb_interrupt(usb);
 850         init_usb_tx(usb);
 851         init_usb_rx(usb);
 852 }
 853
 854 void zd_usb_clear(struct zd_usb *usb)
 855 {
 856         usb_set_intfdata(usb->intf, NULL);
 857         usb_put_intf(usb->intf);
 858         ZD_MEMCLEAR(usb, sizeof(*usb));
 859         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
 860 }
 861
 862 static const char *speed(enum usb_device_speed speed)
 863 {
 864         switch (speed) {
 865         case USB_SPEED_LOW:
 866                 return "low";
 867         case USB_SPEED_FULL:
 868                 return "full";
 869         case USB_SPEED_HIGH:
 870                 return "high";
 871         default:
 872                 return "unknown speed";
 873         }
 874 }
 875
 876 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
 877 {
 878         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
 879                 le16_to_cpu(udev->descriptor.idVendor),
 880                 le16_to_cpu(udev->descriptor.idProduct),
 881                 get_bcdDevice(udev),
 882                 speed(udev->speed));
 883 }
 884
 885 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
 886 {
 887         struct usb_device *udev = interface_to_usbdev(usb->intf);
 888         return scnprint_id(udev, buffer, size);
 889 }
 890
 891 #ifdef DEBUG
 892 static void print_id(struct usb_device *udev)
 893 {
 894         char buffer[40];
 895
 896         scnprint_id(udev, buffer, sizeof(buffer));
 897         buffer[sizeof(buffer)-1] = 0;
 898         dev_dbg_f(&udev->dev, "%s\n", buffer);
 899 }
 900 #else
 901 #define print_id(udev) do { } while (0)
 902 #endif
 903
 904 static int eject_installer(struct usb_interface *intf)
 905 {
 906         struct usb_device *udev = interface_to_usbdev(intf);
 907         struct usb_host_interface *iface_desc = &intf->altsetting[0];
 908         struct usb_endpoint_descriptor *endpoint;
 909         unsigned char *cmd;
 910         u8 bulk_out_ep;
 911         int r;
 912
 913         /* Find bulk out endpoint */
 914         endpoint = &iface_desc->endpoint[1].desc;
 915         if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
 916             (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
 917             USB_ENDPOINT_XFER_BULK) {
 918                 bulk_out_ep = endpoint->bEndpointAddress;
 919         } else {
 920                 dev_err(&udev->dev,
 921                         "zd1211rw: Could not find bulk out endpoint\n");
 922                 return -ENODEV;
 923         }
 924
 925         cmd = kzalloc(31, GFP_KERNEL);
 926         if (cmd == NULL)
 927                 return -ENODEV;
 928
 929         /* USB bulk command block */
 930         cmd[0] = 0x55;  /* bulk command signature */
 931         cmd[1] = 0x53;  /* bulk command signature */
 932         cmd[2] = 0x42;  /* bulk command signature */
 933         cmd[3] = 0x43;  /* bulk command signature */
 934         cmd[14] = 6;    /* command length */
 935
 936         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
 937         cmd[19] = 0x2;  /* eject disc */
 938
 939         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
 940         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
 941                 cmd, 31, NULL, 2000);
 942         kfree(cmd);
 943         if (r)
 944                 return r;
 945
 946         /* At this point, the device disconnects and reconnects with the real
 947          * ID numbers. */
 948
 949         usb_set_intfdata(intf, NULL);
 950         return 0;
 951 }
 952
 953 int zd_usb_init_hw(struct zd_usb *usb)
 954 {
 955         int r;
 956         struct zd_mac *mac = zd_usb_to_mac(usb);
 957
 958         dev_dbg_f(zd_usb_dev(usb), "\n");
 959
 960         r = upload_firmware(usb);
 961         if (r) {
 962                 dev_err(zd_usb_dev(usb),
 963                        "couldn't load firmware. Error number %d\n", r);
 964                 return r;
 965         }
 966
 967         r = usb_reset_configuration(zd_usb_to_usbdev(usb));
 968         if (r) {
 969                 dev_dbg_f(zd_usb_dev(usb),
 970                         "couldn't reset configuration. Error number %d\n", r);
 971                 return r;
 972         }
 973
 974         r = zd_mac_init_hw(mac);
 975         if (r) {
 976                 dev_dbg_f(zd_usb_dev(usb),
 977                          "couldn't initialize mac. Error number %d\n", r);
 978                 return r;
 979         }
 980
 981         usb->initialized = 1;
 982         return 0;
 983 }
 984
 985 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
 986 {
 987         int r;
 988         struct zd_usb *usb;
 989         struct usb_device *udev = interface_to_usbdev(intf);
 990         struct net_device *netdev = NULL;
 991
 992         print_id(udev);
 993
 994         if (id->driver_info & DEVICE_INSTALLER)
 995                 return eject_installer(intf);
 996
 997         switch (udev->speed) {
 998         case USB_SPEED_LOW:
 999         case USB_SPEED_FULL:
1000         case USB_SPEED_HIGH:
1001                 break;
1002         default:
1003                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1004                 r = -ENODEV;
1005                 goto error;
1006         }
1007
1008         usb_reset_device(interface_to_usbdev(intf));
1009
1010         netdev = zd_netdev_alloc(intf);
1011         if (netdev == NULL) {
1012                 r = -ENOMEM;
1013                 goto error;
1014         }
1015
1016         usb = &zd_netdev_mac(netdev)->chip.usb;
1017         usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1018
1019         r = zd_mac_preinit_hw(zd_netdev_mac(netdev));
1020         if (r) {
1021                 dev_dbg_f(&intf->dev,
1022                          "couldn't initialize mac. Error number %d\n", r);
1023                 goto error;
1024         }
1025
1026         r = register_netdev(netdev);
1027         if (r) {
1028                 dev_dbg_f(&intf->dev,
1029                          "couldn't register netdev. Error number %d\n", r);
1030                 goto error;
1031         }
1032
1033         dev_dbg_f(&intf->dev, "successful\n");
1034         dev_info(&intf->dev,"%s\n", netdev->name);
1035         return 0;
1036 error:
1037         usb_reset_device(interface_to_usbdev(intf));
1038         zd_netdev_free(netdev);
1039         return r;
1040 }
1041
1042 static void disconnect(struct usb_interface *intf)
1043 {
1044         struct net_device *netdev = zd_intf_to_netdev(intf);
1045         struct zd_mac *mac = zd_netdev_mac(netdev);
1046         struct zd_usb *usb = &mac->chip.usb;
1047
1048         /* Either something really bad happened, or we're just dealing with
1049          * a DEVICE_INSTALLER. */
1050         if (netdev == NULL)
1051                 return;
1052
1053         dev_dbg_f(zd_usb_dev(usb), "\n");
1054
1055         zd_netdev_disconnect(netdev);
1056
1057         /* Just in case something has gone wrong! */
1058         zd_usb_disable_rx(usb);
1059         zd_usb_disable_int(usb);
1060
1061         /* If the disconnect has been caused by a removal of the
1062          * driver module, the reset allows reloading of the driver. If the
1063          * reset will not be executed here, the upload of the firmware in the
1064          * probe function caused by the reloading of the driver will fail.
1065          */
1066         usb_reset_device(interface_to_usbdev(intf));
1067
1068         zd_netdev_free(netdev);
1069         dev_dbg(&intf->dev, "disconnected\n");
1070 }
1071
1072 static struct usb_driver driver = {
1073         .name           = "zd1211rw",
1074         .id_table       = usb_ids,
1075         .probe          = probe,
1076         .disconnect     = disconnect,
1077 };
1078
1079 struct workqueue_struct *zd_workqueue;
1080
1081 static int __init usb_init(void)
1082 {
1083         int r;
1084
1085         pr_debug("%s usb_init()\n", driver.name);
1086
1087         zd_workqueue = create_singlethread_workqueue(driver.name);
1088         if (zd_workqueue == NULL) {
1089                 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1090                 return -ENOMEM;
1091         }
1092
1093         r = usb_register(&driver);
1094         if (r) {
1095                 destroy_workqueue(zd_workqueue);
1096                 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1097                        driver.name, r);
1098                 return r;
1099         }
1100
1101         pr_debug("%s initialized\n", driver.name);
1102         return 0;
1103 }
1104
1105 static void __exit usb_exit(void)
1106 {
1107         pr_debug("%s usb_exit()\n", driver.name);
1108         usb_deregister(&driver);
1109         destroy_workqueue(zd_workqueue);
1110 }
1111
1112 module_init(usb_init);
1113 module_exit(usb_exit);
1114
1115 static int usb_int_regs_length(unsigned int count)
1116 {
1117         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1118 }
1119
1120 static void prepare_read_regs_int(struct zd_usb *usb)
1121 {
1122         struct zd_usb_interrupt *intr = &usb->intr;
1123
1124         spin_lock_irq(&intr->lock);
1125         intr->read_regs_enabled = 1;
1126         INIT_COMPLETION(intr->read_regs.completion);
1127         spin_unlock_irq(&intr->lock);
1128 }
1129
1130 static void disable_read_regs_int(struct zd_usb *usb)
1131 {
1132         struct zd_usb_interrupt *intr = &usb->intr;
1133
1134         spin_lock_irq(&intr->lock);
1135         intr->read_regs_enabled = 0;
1136         spin_unlock_irq(&intr->lock);
1137 }
1138
1139 static int get_results(struct zd_usb *usb, u16 *values,
1140                        struct usb_req_read_regs *req, unsigned int count)
1141 {
1142         int r;
1143         int i;
1144         struct zd_usb_interrupt *intr = &usb->intr;
1145         struct read_regs_int *rr = &intr->read_regs;
1146         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1147
1148         spin_lock_irq(&intr->lock);
1149
1150         r = -EIO;
1151         /* The created block size seems to be larger than expected.
1152          * However results appear to be correct.
1153          */
1154         if (rr->length < usb_int_regs_length(count)) {
1155                 dev_dbg_f(zd_usb_dev(usb),
1156                          "error: actual length %d less than expected %d\n",
1157                          rr->length, usb_int_regs_length(count));
1158                 goto error_unlock;
1159         }
1160         if (rr->length > sizeof(rr->buffer)) {
1161                 dev_dbg_f(zd_usb_dev(usb),
1162                          "error: actual length %d exceeds buffer size %zu\n",
1163                          rr->length, sizeof(rr->buffer));
1164                 goto error_unlock;
1165         }
1166
1167         for (i = 0; i < count; i++) {
1168                 struct reg_data *rd = &regs->regs[i];
1169                 if (rd->addr != req->addr[i]) {
1170                         dev_dbg_f(zd_usb_dev(usb),
1171                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1172                                  le16_to_cpu(rd->addr),
1173                                  le16_to_cpu(req->addr[i]));
1174                         goto error_unlock;
1175                 }
1176                 values[i] = le16_to_cpu(rd->value);
1177         }
1178
1179         r = 0;
1180 error_unlock:
1181         spin_unlock_irq(&intr->lock);
1182         return r;
1183 }
1184
1185 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1186                      const zd_addr_t *addresses, unsigned int count)
1187 {
1188         int r;
1189         int i, req_len, actual_req_len;
1190         struct usb_device *udev;
1191         struct usb_req_read_regs *req = NULL;
1192         unsigned long timeout;
1193
1194         if (count < 1) {
1195                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1196                 return -EINVAL;
1197         }
1198         if (count > USB_MAX_IOREAD16_COUNT) {
1199                 dev_dbg_f(zd_usb_dev(usb),
1200                          "error: count %u exceeds possible max %u\n",
1201                          count, USB_MAX_IOREAD16_COUNT);
1202                 return -EINVAL;
1203         }
1204         if (in_atomic()) {
1205                 dev_dbg_f(zd_usb_dev(usb),
1206                          "error: io in atomic context not supported\n");
1207                 return -EWOULDBLOCK;
1208         }
1209         if (!usb_int_enabled(usb)) {
1210                  dev_dbg_f(zd_usb_dev(usb),
1211                           "error: usb interrupt not enabled\n");
1212                 return -EWOULDBLOCK;
1213         }
1214
1215         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1216         req = kmalloc(req_len, GFP_KERNEL);
1217         if (!req)
1218                 return -ENOMEM;
1219         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1220         for (i = 0; i < count; i++)
1221                 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1222
1223         udev = zd_usb_to_usbdev(usb);
1224         prepare_read_regs_int(usb);
1225         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1226                          req, req_len, &actual_req_len, 1000 /* ms */);
1227         if (r) {
1228                 dev_dbg_f(zd_usb_dev(usb),
1229                         "error in usb_bulk_msg(). Error number %d\n", r);
1230                 goto error;
1231         }
1232         if (req_len != actual_req_len) {
1233                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1234                         " req_len %d != actual_req_len %d\n",
1235                         req_len, actual_req_len);
1236                 r = -EIO;
1237                 goto error;
1238         }
1239
1240         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1241                                               msecs_to_jiffies(1000));
1242         if (!timeout) {
1243                 disable_read_regs_int(usb);
1244                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1245                 r = -ETIMEDOUT;
1246                 goto error;
1247         }
1248
1249         r = get_results(usb, values, req, count);
1250 error:
1251         kfree(req);
1252         return r;
1253 }
1254
1255 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1256                       unsigned int count)
1257 {
1258         int r;
1259         struct usb_device *udev;
1260         struct usb_req_write_regs *req = NULL;
1261         int i, req_len, actual_req_len;
1262
1263         if (count == 0)
1264                 return 0;
1265         if (count > USB_MAX_IOWRITE16_COUNT) {
1266                 dev_dbg_f(zd_usb_dev(usb),
1267                         "error: count %u exceeds possible max %u\n",
1268                         count, USB_MAX_IOWRITE16_COUNT);
1269                 return -EINVAL;
1270         }
1271         if (in_atomic()) {
1272                 dev_dbg_f(zd_usb_dev(usb),
1273                         "error: io in atomic context not supported\n");
1274                 return -EWOULDBLOCK;
1275         }
1276
1277         req_len = sizeof(struct usb_req_write_regs) +
1278                   count * sizeof(struct reg_data);
1279         req = kmalloc(req_len, GFP_KERNEL);
1280         if (!req)
1281                 return -ENOMEM;
1282
1283         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1284         for (i = 0; i < count; i++) {
1285                 struct reg_data *rw  = &req->reg_writes[i];
1286                 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1287                 rw->value = cpu_to_le16(ioreqs[i].value);
1288         }
1289
1290         udev = zd_usb_to_usbdev(usb);
1291         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1292                          req, req_len, &actual_req_len, 1000 /* ms */);
1293         if (r) {
1294                 dev_dbg_f(zd_usb_dev(usb),
1295                         "error in usb_bulk_msg(). Error number %d\n", r);
1296                 goto error;
1297         }
1298         if (req_len != actual_req_len) {
1299                 dev_dbg_f(zd_usb_dev(usb),
1300                         "error in usb_bulk_msg()"
1301                         " req_len %d != actual_req_len %d\n",
1302                         req_len, actual_req_len);
1303                 r = -EIO;
1304                 goto error;
1305         }
1306
1307         /* FALL-THROUGH with r == 0 */
1308 error:
1309         kfree(req);
1310         return r;
1311 }
1312
1313 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1314 {
1315         int r;
1316         struct usb_device *udev;
1317         struct usb_req_rfwrite *req = NULL;
1318         int i, req_len, actual_req_len;
1319         u16 bit_value_template;
1320
1321         if (in_atomic()) {
1322                 dev_dbg_f(zd_usb_dev(usb),
1323                         "error: io in atomic context not supported\n");
1324                 return -EWOULDBLOCK;
1325         }
1326         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1327                 dev_dbg_f(zd_usb_dev(usb),
1328                         "error: bits %d are smaller than"
1329                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1330                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1331                 return -EINVAL;
1332         }
1333         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1334                 dev_dbg_f(zd_usb_dev(usb),
1335                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1336                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1337                 return -EINVAL;
1338         }
1339 #ifdef DEBUG
1340         if (value & (~0UL << bits)) {
1341                 dev_dbg_f(zd_usb_dev(usb),
1342                         "error: value %#09x has bits >= %d set\n",
1343                         value, bits);
1344                 return -EINVAL;
1345         }
1346 #endif /* DEBUG */
1347
1348         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1349
1350         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1351         if (r) {
1352                 dev_dbg_f(zd_usb_dev(usb),
1353                         "error %d: Couldn't read CR203\n", r);
1354                 goto out;
1355         }
1356         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1357
1358         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1359         req = kmalloc(req_len, GFP_KERNEL);
1360         if (!req)
1361                 return -ENOMEM;
1362
1363         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1364         /* 1: 3683a, but not used in ZYDAS driver */
1365         req->value = cpu_to_le16(2);
1366         req->bits = cpu_to_le16(bits);
1367
1368         for (i = 0; i < bits; i++) {
1369                 u16 bv = bit_value_template;
1370                 if (value & (1 << (bits-1-i)))
1371                         bv |= RF_DATA;
1372                 req->bit_values[i] = cpu_to_le16(bv);
1373         }
1374
1375         udev = zd_usb_to_usbdev(usb);
1376         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1377                          req, req_len, &actual_req_len, 1000 /* ms */);
1378         if (r) {
1379                 dev_dbg_f(zd_usb_dev(usb),
1380                         "error in usb_bulk_msg(). Error number %d\n", r);
1381                 goto out;
1382         }
1383         if (req_len != actual_req_len) {
1384                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1385                         " req_len %d != actual_req_len %d\n",
1386                         req_len, actual_req_len);
1387                 r = -EIO;
1388                 goto out;
1389         }
1390
1391         /* FALL-THROUGH with r == 0 */
1392 out:
1393         kfree(req);
1394         return r;
1395 }