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         /* "Driverless" devices that need ejecting */
  78         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
  79         { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
  80         {}
  81 };
  82
  83 MODULE_LICENSE("GPL");
  84 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
  85 MODULE_AUTHOR("Ulrich Kunitz");
  86 MODULE_AUTHOR("Daniel Drake");
  87 MODULE_VERSION("1.0");
  88 MODULE_DEVICE_TABLE(usb, usb_ids);
  89
  90 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
  91 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
  92
  93 /* USB device initialization */
  94
  95 static int request_fw_file(
  96         const struct firmware **fw, const char *name, struct device *device)
  97 {
  98         int r;
  99
 100         dev_dbg_f(device, "fw name %s\n", name);
 101
 102         r = request_firmware(fw, name, device);
 103         if (r)
 104                 dev_err(device,
 105                        "Could not load firmware file %s. Error number %d\n",
 106                        name, r);
 107         return r;
 108 }
 109
 110 static inline u16 get_bcdDevice(const struct usb_device *udev)
 111 {
 112         return le16_to_cpu(udev->descriptor.bcdDevice);
 113 }
 114
 115 enum upload_code_flags {
 116         REBOOT = 1,
 117 };
 118
 119 /* Ensures that MAX_TRANSFER_SIZE is even. */
 120 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 121
 122 static int upload_code(struct usb_device *udev,
 123         const u8 *data, size_t size, u16 code_offset, int flags)
 124 {
 125         u8 *p;
 126         int r;
 127
 128         /* USB request blocks need "kmalloced" buffers.
 129          */
 130         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 131         if (!p) {
 132                 dev_err(&udev->dev, "out of memory\n");
 133                 r = -ENOMEM;
 134                 goto error;
 135         }
 136
 137         size &= ~1;
 138         while (size > 0) {
 139                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 140                         size : MAX_TRANSFER_SIZE;
 141
 142                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 143
 144                 memcpy(p, data, transfer_size);
 145                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 146                         USB_REQ_FIRMWARE_DOWNLOAD,
 147                         USB_DIR_OUT | USB_TYPE_VENDOR,
 148                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 149                 if (r < 0) {
 150                         dev_err(&udev->dev,
 151                                "USB control request for firmware upload"
 152                                " failed. Error number %d\n", r);
 153                         goto error;
 154                 }
 155                 transfer_size = r & ~1;
 156
 157                 size -= transfer_size;
 158                 data += transfer_size;
 159                 code_offset += transfer_size/sizeof(u16);
 160         }
 161
 162         if (flags & REBOOT) {
 163                 u8 ret;
 164
 165                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 166                         USB_REQ_FIRMWARE_CONFIRM,
 167                         USB_DIR_IN | USB_TYPE_VENDOR,
 168                         0, 0, &ret, sizeof(ret), 5000 /* ms */);
 169                 if (r != sizeof(ret)) {
 170                         dev_err(&udev->dev,
 171                                 "control request firmeware confirmation failed."
 172                                 " Return value %d\n", r);
 173                         if (r >= 0)
 174                                 r = -ENODEV;
 175                         goto error;
 176                 }
 177                 if (ret & 0x80) {
 178                         dev_err(&udev->dev,
 179                                 "Internal error while downloading."
 180                                 " Firmware confirm return value %#04x\n",
 181                                 (unsigned int)ret);
 182                         r = -ENODEV;
 183                         goto error;
 184                 }
 185                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 186                         (unsigned int)ret);
 187         }
 188
 189         r = 0;
 190 error:
 191         kfree(p);
 192         return r;
 193 }
 194
 195 static u16 get_word(const void *data, u16 offset)
 196 {
 197         const __le16 *p = data;
 198         return le16_to_cpu(p[offset]);
 199 }
 200
 201 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
 202                        const char* postfix)
 203 {
 204         scnprintf(buffer, size, "%s%s",
 205                 usb->is_zd1211b ?
 206                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 207                 postfix);
 208         return buffer;
 209 }
 210
 211 static int handle_version_mismatch(struct zd_usb *usb,
 212         const struct firmware *ub_fw)
 213 {
 214         struct usb_device *udev = zd_usb_to_usbdev(usb);
 215         const struct firmware *ur_fw = NULL;
 216         int offset;
 217         int r = 0;
 218         char fw_name[128];
 219
 220         r = request_fw_file(&ur_fw,
 221                 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
 222                 &udev->dev);
 223         if (r)
 224                 goto error;
 225
 226         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
 227         if (r)
 228                 goto error;
 229
 230         offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
 231         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
 232                 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
 233
 234         /* At this point, the vendor driver downloads the whole firmware
 235          * image, hacks around with version IDs, and uploads it again,
 236          * completely overwriting the boot code. We do not do this here as
 237          * it is not required on any tested devices, and it is suspected to
 238          * cause problems. */
 239 error:
 240         release_firmware(ur_fw);
 241         return r;
 242 }
 243
 244 static int upload_firmware(struct zd_usb *usb)
 245 {
 246         int r;
 247         u16 fw_bcdDevice;
 248         u16 bcdDevice;
 249         struct usb_device *udev = zd_usb_to_usbdev(usb);
 250         const struct firmware *ub_fw = NULL;
 251         const struct firmware *uph_fw = NULL;
 252         char fw_name[128];
 253
 254         bcdDevice = get_bcdDevice(udev);
 255
 256         r = request_fw_file(&ub_fw,
 257                 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
 258                 &udev->dev);
 259         if (r)
 260                 goto error;
 261
 262         fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
 263
 264         if (fw_bcdDevice != bcdDevice) {
 265                 dev_info(&udev->dev,
 266                         "firmware version %#06x and device bootcode version "
 267                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
 268                 if (bcdDevice <= 0x4313)
 269                         dev_warn(&udev->dev, "device has old bootcode, please "
 270                                 "report success or failure\n");
 271
 272                 r = handle_version_mismatch(usb, ub_fw);
 273                 if (r)
 274                         goto error;
 275         } else {
 276                 dev_dbg_f(&udev->dev,
 277                         "firmware device id %#06x is equal to the "
 278                         "actual device id\n", fw_bcdDevice);
 279         }
 280
 281
 282         r = request_fw_file(&uph_fw,
 283                 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
 284                 &udev->dev);
 285         if (r)
 286                 goto error;
 287
 288         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
 289         if (r) {
 290                 dev_err(&udev->dev,
 291                         "Could not upload firmware code uph. Error number %d\n",
 292                         r);
 293         }
 294
 295         /* FALL-THROUGH */
 296 error:
 297         release_firmware(ub_fw);
 298         release_firmware(uph_fw);
 299         return r;
 300 }
 301
 302 /* Read data from device address space using "firmware interface" which does
 303  * not require firmware to be loaded. */
 304 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
 305 {
 306         int r;
 307         struct usb_device *udev = zd_usb_to_usbdev(usb);
 308
 309         r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 310                 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
 311                 data, len, 5000);
 312         if (r < 0) {
 313                 dev_err(&udev->dev,
 314                         "read over firmware interface failed: %d\n", r);
 315                 return r;
 316         } else if (r != len) {
 317                 dev_err(&udev->dev,
 318                         "incomplete read over firmware interface: %d/%d\n",
 319                         r, len);
 320                 return -EIO;
 321         }
 322
 323         return 0;
 324 }
 325
 326 #define urb_dev(urb) (&(urb)->dev->dev)
 327
 328 static inline void handle_regs_int(struct urb *urb)
 329 {
 330         struct zd_usb *usb = urb->context;
 331         struct zd_usb_interrupt *intr = &usb->intr;
 332         int len;
 333
 334         ZD_ASSERT(in_interrupt());
 335         spin_lock(&intr->lock);
 336
 337         if (intr->read_regs_enabled) {
 338                 intr->read_regs.length = len = urb->actual_length;
 339
 340                 if (len > sizeof(intr->read_regs.buffer))
 341                         len = sizeof(intr->read_regs.buffer);
 342                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 343                 intr->read_regs_enabled = 0;
 344                 complete(&intr->read_regs.completion);
 345                 goto out;
 346         }
 347
 348         dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
 349 out:
 350         spin_unlock(&intr->lock);
 351 }
 352
 353 static inline void handle_retry_failed_int(struct urb *urb)
 354 {
 355         struct zd_usb *usb = urb->context;
 356         struct zd_mac *mac = zd_usb_to_mac(usb);
 357         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 358
 359         ieee->stats.tx_errors++;
 360         ieee->ieee_stats.tx_retry_limit_exceeded++;
 361         dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
 362 }
 363
 364
 365 static void int_urb_complete(struct urb *urb)
 366 {
 367         int r;
 368         struct usb_int_header *hdr;
 369
 370         switch (urb->status) {
 371         case 0:
 372                 break;
 373         case -ESHUTDOWN:
 374         case -EINVAL:
 375         case -ENODEV:
 376         case -ENOENT:
 377         case -ECONNRESET:
 378         case -EPIPE:
 379                 goto kfree;
 380         default:
 381                 goto resubmit;
 382         }
 383
 384         if (urb->actual_length < sizeof(hdr)) {
 385                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 386                 goto resubmit;
 387         }
 388
 389         hdr = urb->transfer_buffer;
 390         if (hdr->type != USB_INT_TYPE) {
 391                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 392                 goto resubmit;
 393         }
 394
 395         switch (hdr->id) {
 396         case USB_INT_ID_REGS:
 397                 handle_regs_int(urb);
 398                 break;
 399         case USB_INT_ID_RETRY_FAILED:
 400                 handle_retry_failed_int(urb);
 401                 break;
 402         default:
 403                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 404                         (unsigned int)hdr->id);
 405                 goto resubmit;
 406         }
 407
 408 resubmit:
 409         r = usb_submit_urb(urb, GFP_ATOMIC);
 410         if (r) {
 411                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
 412                 goto kfree;
 413         }
 414         return;
 415 kfree:
 416         kfree(urb->transfer_buffer);
 417 }
 418
 419 static inline int int_urb_interval(struct usb_device *udev)
 420 {
 421         switch (udev->speed) {
 422         case USB_SPEED_HIGH:
 423                 return 4;
 424         case USB_SPEED_LOW:
 425                 return 10;
 426         case USB_SPEED_FULL:
 427         default:
 428                 return 1;
 429         }
 430 }
 431
 432 static inline int usb_int_enabled(struct zd_usb *usb)
 433 {
 434         unsigned long flags;
 435         struct zd_usb_interrupt *intr = &usb->intr;
 436         struct urb *urb;
 437
 438         spin_lock_irqsave(&intr->lock, flags);
 439         urb = intr->urb;
 440         spin_unlock_irqrestore(&intr->lock, flags);
 441         return urb != NULL;
 442 }
 443
 444 int zd_usb_enable_int(struct zd_usb *usb)
 445 {
 446         int r;
 447         struct usb_device *udev;
 448         struct zd_usb_interrupt *intr = &usb->intr;
 449         void *transfer_buffer = NULL;
 450         struct urb *urb;
 451
 452         dev_dbg_f(zd_usb_dev(usb), "\n");
 453
 454         urb = usb_alloc_urb(0, GFP_KERNEL);
 455         if (!urb) {
 456                 r = -ENOMEM;
 457                 goto out;
 458         }
 459
 460         ZD_ASSERT(!irqs_disabled());
 461         spin_lock_irq(&intr->lock);
 462         if (intr->urb) {
 463                 spin_unlock_irq(&intr->lock);
 464                 r = 0;
 465                 goto error_free_urb;
 466         }
 467         intr->urb = urb;
 468         spin_unlock_irq(&intr->lock);
 469
 470         /* TODO: make it a DMA buffer */
 471         r = -ENOMEM;
 472         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
 473         if (!transfer_buffer) {
 474                 dev_dbg_f(zd_usb_dev(usb),
 475                         "couldn't allocate transfer_buffer\n");
 476                 goto error_set_urb_null;
 477         }
 478
 479         udev = zd_usb_to_usbdev(usb);
 480         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 481                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
 482                          int_urb_complete, usb,
 483                          intr->interval);
 484
 485         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 486         r = usb_submit_urb(urb, GFP_KERNEL);
 487         if (r) {
 488                 dev_dbg_f(zd_usb_dev(usb),
 489                          "Couldn't submit urb. Error number %d\n", r);
 490                 goto error;
 491         }
 492
 493         return 0;
 494 error:
 495         kfree(transfer_buffer);
 496 error_set_urb_null:
 497         spin_lock_irq(&intr->lock);
 498         intr->urb = NULL;
 499         spin_unlock_irq(&intr->lock);
 500 error_free_urb:
 501         usb_free_urb(urb);
 502 out:
 503         return r;
 504 }
 505
 506 void zd_usb_disable_int(struct zd_usb *usb)
 507 {
 508         unsigned long flags;
 509         struct zd_usb_interrupt *intr = &usb->intr;
 510         struct urb *urb;
 511
 512         spin_lock_irqsave(&intr->lock, flags);
 513         urb = intr->urb;
 514         if (!urb) {
 515                 spin_unlock_irqrestore(&intr->lock, flags);
 516                 return;
 517         }
 518         intr->urb = NULL;
 519         spin_unlock_irqrestore(&intr->lock, flags);
 520
 521         usb_kill_urb(urb);
 522         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 523         usb_free_urb(urb);
 524 }
 525
 526 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 527                              unsigned int length)
 528 {
 529         int i;
 530         struct zd_mac *mac = zd_usb_to_mac(usb);
 531         const struct rx_length_info *length_info;
 532
 533         if (length < sizeof(struct rx_length_info)) {
 534                 /* It's not a complete packet anyhow. */
 535                 struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 536                 ieee->stats.rx_errors++;
 537                 ieee->stats.rx_length_errors++;
 538                 return;
 539         }
 540         length_info = (struct rx_length_info *)
 541                 (buffer + length - sizeof(struct rx_length_info));
 542
 543         /* It might be that three frames are merged into a single URB
 544          * transaction. We have to check for the length info tag.
 545          *
 546          * While testing we discovered that length_info might be unaligned,
 547          * because if USB transactions are merged, the last packet will not
 548          * be padded. Unaligned access might also happen if the length_info
 549          * structure is not present.
 550          */
 551         if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
 552         {
 553                 unsigned int l, k, n;
 554                 for (i = 0, l = 0;; i++) {
 555                         k = le16_to_cpu(get_unaligned(&length_info->length[i]));
 556                         if (k == 0)
 557                                 return;
 558                         n = l+k;
 559                         if (n > length)
 560                                 return;
 561                         zd_mac_rx_irq(mac, buffer+l, k);
 562                         if (i >= 2)
 563                                 return;
 564                         l = (n+3) & ~3;
 565                 }
 566         } else {
 567                 zd_mac_rx_irq(mac, buffer, length);
 568         }
 569 }
 570
 571 static void rx_urb_complete(struct urb *urb)
 572 {
 573         struct zd_usb *usb;
 574         struct zd_usb_rx *rx;
 575         const u8 *buffer;
 576         unsigned int length;
 577
 578         switch (urb->status) {
 579         case 0:
 580                 break;
 581         case -ESHUTDOWN:
 582         case -EINVAL:
 583         case -ENODEV:
 584         case -ENOENT:
 585         case -ECONNRESET:
 586         case -EPIPE:
 587                 return;
 588         default:
 589                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 590                 goto resubmit;
 591         }
 592
 593         buffer = urb->transfer_buffer;
 594         length = urb->actual_length;
 595         usb = urb->context;
 596         rx = &usb->rx;
 597
 598         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 599                 /* If there is an old first fragment, we don't care. */
 600                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 601                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 602                 spin_lock(&rx->lock);
 603                 memcpy(rx->fragment, buffer, length);
 604                 rx->fragment_length = length;
 605                 spin_unlock(&rx->lock);
 606                 goto resubmit;
 607         }
 608
 609         spin_lock(&rx->lock);
 610         if (rx->fragment_length > 0) {
 611                 /* We are on a second fragment, we believe */
 612                 ZD_ASSERT(length + rx->fragment_length <=
 613                           ARRAY_SIZE(rx->fragment));
 614                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 615                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 616                 handle_rx_packet(usb, rx->fragment,
 617                                  rx->fragment_length + length);
 618                 rx->fragment_length = 0;
 619                 spin_unlock(&rx->lock);
 620         } else {
 621                 spin_unlock(&rx->lock);
 622                 handle_rx_packet(usb, buffer, length);
 623         }
 624
 625 resubmit:
 626         usb_submit_urb(urb, GFP_ATOMIC);
 627 }
 628
 629 static struct urb *alloc_urb(struct zd_usb *usb)
 630 {
 631         struct usb_device *udev = zd_usb_to_usbdev(usb);
 632         struct urb *urb;
 633         void *buffer;
 634
 635         urb = usb_alloc_urb(0, GFP_KERNEL);
 636         if (!urb)
 637                 return NULL;
 638         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
 639                                   &urb->transfer_dma);
 640         if (!buffer) {
 641                 usb_free_urb(urb);
 642                 return NULL;
 643         }
 644
 645         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 646                           buffer, USB_MAX_RX_SIZE,
 647                           rx_urb_complete, usb);
 648         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 649
 650         return urb;
 651 }
 652
 653 static void free_urb(struct urb *urb)
 654 {
 655         if (!urb)
 656                 return;
 657         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 658                         urb->transfer_buffer, urb->transfer_dma);
 659         usb_free_urb(urb);
 660 }
 661
 662 int zd_usb_enable_rx(struct zd_usb *usb)
 663 {
 664         int i, r;
 665         struct zd_usb_rx *rx = &usb->rx;
 666         struct urb **urbs;
 667
 668         dev_dbg_f(zd_usb_dev(usb), "\n");
 669
 670         r = -ENOMEM;
 671         urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
 672         if (!urbs)
 673                 goto error;
 674         for (i = 0; i < URBS_COUNT; i++) {
 675                 urbs[i] = alloc_urb(usb);
 676                 if (!urbs[i])
 677                         goto error;
 678         }
 679
 680         ZD_ASSERT(!irqs_disabled());
 681         spin_lock_irq(&rx->lock);
 682         if (rx->urbs) {
 683                 spin_unlock_irq(&rx->lock);
 684                 r = 0;
 685                 goto error;
 686         }
 687         rx->urbs = urbs;
 688         rx->urbs_count = URBS_COUNT;
 689         spin_unlock_irq(&rx->lock);
 690
 691         for (i = 0; i < URBS_COUNT; i++) {
 692                 r = usb_submit_urb(urbs[i], GFP_KERNEL);
 693                 if (r)
 694                         goto error_submit;
 695         }
 696
 697         return 0;
 698 error_submit:
 699         for (i = 0; i < URBS_COUNT; i++) {
 700                 usb_kill_urb(urbs[i]);
 701         }
 702         spin_lock_irq(&rx->lock);
 703         rx->urbs = NULL;
 704         rx->urbs_count = 0;
 705         spin_unlock_irq(&rx->lock);
 706 error:
 707         if (urbs) {
 708                 for (i = 0; i < URBS_COUNT; i++)
 709                         free_urb(urbs[i]);
 710         }
 711         return r;
 712 }
 713
 714 void zd_usb_disable_rx(struct zd_usb *usb)
 715 {
 716         int i;
 717         unsigned long flags;
 718         struct urb **urbs;
 719         unsigned int count;
 720         struct zd_usb_rx *rx = &usb->rx;
 721
 722         spin_lock_irqsave(&rx->lock, flags);
 723         urbs = rx->urbs;
 724         count = rx->urbs_count;
 725         spin_unlock_irqrestore(&rx->lock, flags);
 726         if (!urbs)
 727                 return;
 728
 729         for (i = 0; i < count; i++) {
 730                 usb_kill_urb(urbs[i]);
 731                 free_urb(urbs[i]);
 732         }
 733         kfree(urbs);
 734
 735         spin_lock_irqsave(&rx->lock, flags);
 736         rx->urbs = NULL;
 737         rx->urbs_count = 0;
 738         spin_unlock_irqrestore(&rx->lock, flags);
 739 }
 740
 741 static void tx_urb_complete(struct urb *urb)
 742 {
 743         int r;
 744
 745         switch (urb->status) {
 746         case 0:
 747                 break;
 748         case -ESHUTDOWN:
 749         case -EINVAL:
 750         case -ENODEV:
 751         case -ENOENT:
 752         case -ECONNRESET:
 753         case -EPIPE:
 754                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 755                 break;
 756         default:
 757                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 758                 goto resubmit;
 759         }
 760 free_urb:
 761         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 762                         urb->transfer_buffer, urb->transfer_dma);
 763         usb_free_urb(urb);
 764         return;
 765 resubmit:
 766         r = usb_submit_urb(urb, GFP_ATOMIC);
 767         if (r) {
 768                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 769                 goto free_urb;
 770         }
 771 }
 772
 773 /* Puts the frame on the USB endpoint. It doesn't wait for
 774  * completion. The frame must contain the control set.
 775  */
 776 int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
 777 {
 778         int r;
 779         struct usb_device *udev = zd_usb_to_usbdev(usb);
 780         struct urb *urb;
 781         void *buffer;
 782
 783         urb = usb_alloc_urb(0, GFP_ATOMIC);
 784         if (!urb) {
 785                 r = -ENOMEM;
 786                 goto out;
 787         }
 788
 789         buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
 790                                   &urb->transfer_dma);
 791         if (!buffer) {
 792                 r = -ENOMEM;
 793                 goto error_free_urb;
 794         }
 795         memcpy(buffer, frame, length);
 796
 797         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 798                           buffer, length, tx_urb_complete, NULL);
 799         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 800
 801         r = usb_submit_urb(urb, GFP_ATOMIC);
 802         if (r)
 803                 goto error;
 804         return 0;
 805 error:
 806         usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
 807                         urb->transfer_dma);
 808 error_free_urb:
 809         usb_free_urb(urb);
 810 out:
 811         return r;
 812 }
 813
 814 static inline void init_usb_interrupt(struct zd_usb *usb)
 815 {
 816         struct zd_usb_interrupt *intr = &usb->intr;
 817
 818         spin_lock_init(&intr->lock);
 819         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 820         init_completion(&intr->read_regs.completion);
 821         intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
 822 }
 823
 824 static inline void init_usb_rx(struct zd_usb *usb)
 825 {
 826         struct zd_usb_rx *rx = &usb->rx;
 827         spin_lock_init(&rx->lock);
 828         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 829                 rx->usb_packet_size = 512;
 830         } else {
 831                 rx->usb_packet_size = 64;
 832         }
 833         ZD_ASSERT(rx->fragment_length == 0);
 834 }
 835
 836 static inline void init_usb_tx(struct zd_usb *usb)
 837 {
 838         /* FIXME: at this point we will allocate a fixed number of urb's for
 839          * use in a cyclic scheme */
 840 }
 841
 842 void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
 843                  struct usb_interface *intf)
 844 {
 845         memset(usb, 0, sizeof(*usb));
 846         usb->intf = usb_get_intf(intf);
 847         usb_set_intfdata(usb->intf, netdev);
 848         init_usb_interrupt(usb);
 849         init_usb_tx(usb);
 850         init_usb_rx(usb);
 851 }
 852
 853 void zd_usb_clear(struct zd_usb *usb)
 854 {
 855         usb_set_intfdata(usb->intf, NULL);
 856         usb_put_intf(usb->intf);
 857         ZD_MEMCLEAR(usb, sizeof(*usb));
 858         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
 859 }
 860
 861 static const char *speed(enum usb_device_speed speed)
 862 {
 863         switch (speed) {
 864         case USB_SPEED_LOW:
 865                 return "low";
 866         case USB_SPEED_FULL:
 867                 return "full";
 868         case USB_SPEED_HIGH:
 869                 return "high";
 870         default:
 871                 return "unknown speed";
 872         }
 873 }
 874
 875 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
 876 {
 877         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
 878                 le16_to_cpu(udev->descriptor.idVendor),
 879                 le16_to_cpu(udev->descriptor.idProduct),
 880                 get_bcdDevice(udev),
 881                 speed(udev->speed));
 882 }
 883
 884 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
 885 {
 886         struct usb_device *udev = interface_to_usbdev(usb->intf);
 887         return scnprint_id(udev, buffer, size);
 888 }
 889
 890 #ifdef DEBUG
 891 static void print_id(struct usb_device *udev)
 892 {
 893         char buffer[40];
 894
 895         scnprint_id(udev, buffer, sizeof(buffer));
 896         buffer[sizeof(buffer)-1] = 0;
 897         dev_dbg_f(&udev->dev, "%s\n", buffer);
 898 }
 899 #else
 900 #define print_id(udev) do { } while (0)
 901 #endif
 902
 903 static int eject_installer(struct usb_interface *intf)
 904 {
 905         struct usb_device *udev = interface_to_usbdev(intf);
 906         struct usb_host_interface *iface_desc = &intf->altsetting[0];
 907         struct usb_endpoint_descriptor *endpoint;
 908         unsigned char *cmd;
 909         u8 bulk_out_ep;
 910         int r;
 911
 912         /* Find bulk out endpoint */
 913         endpoint = &iface_desc->endpoint[1].desc;
 914         if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
 915             (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
 916             USB_ENDPOINT_XFER_BULK) {
 917                 bulk_out_ep = endpoint->bEndpointAddress;
 918         } else {
 919                 dev_err(&udev->dev,
 920                         "zd1211rw: Could not find bulk out endpoint\n");
 921                 return -ENODEV;
 922         }
 923
 924         cmd = kzalloc(31, GFP_KERNEL);
 925         if (cmd == NULL)
 926                 return -ENODEV;
 927
 928         /* USB bulk command block */
 929         cmd[0] = 0x55;  /* bulk command signature */
 930         cmd[1] = 0x53;  /* bulk command signature */
 931         cmd[2] = 0x42;  /* bulk command signature */
 932         cmd[3] = 0x43;  /* bulk command signature */
 933         cmd[14] = 6;    /* command length */
 934
 935         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
 936         cmd[19] = 0x2;  /* eject disc */
 937
 938         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
 939         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
 940                 cmd, 31, NULL, 2000);
 941         kfree(cmd);
 942         if (r)
 943                 return r;
 944
 945         /* At this point, the device disconnects and reconnects with the real
 946          * ID numbers. */
 947
 948         usb_set_intfdata(intf, NULL);
 949         return 0;
 950 }
 951
 952 int zd_usb_init_hw(struct zd_usb *usb)
 953 {
 954         int r;
 955         struct zd_mac *mac = zd_usb_to_mac(usb);
 956
 957         dev_dbg_f(zd_usb_dev(usb), "\n");
 958
 959         r = upload_firmware(usb);
 960         if (r) {
 961                 dev_err(zd_usb_dev(usb),
 962                        "couldn't load firmware. Error number %d\n", r);
 963                 return r;
 964         }
 965
 966         r = usb_reset_configuration(zd_usb_to_usbdev(usb));
 967         if (r) {
 968                 dev_dbg_f(zd_usb_dev(usb),
 969                         "couldn't reset configuration. Error number %d\n", r);
 970                 return r;
 971         }
 972
 973         r = zd_mac_init_hw(mac);
 974         if (r) {
 975                 dev_dbg_f(zd_usb_dev(usb),
 976                          "couldn't initialize mac. Error number %d\n", r);
 977                 return r;
 978         }
 979
 980         usb->initialized = 1;
 981         return 0;
 982 }
 983
 984 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
 985 {
 986         int r;
 987         struct zd_usb *usb;
 988         struct usb_device *udev = interface_to_usbdev(intf);
 989         struct net_device *netdev = NULL;
 990
 991         print_id(udev);
 992
 993         if (id->driver_info & DEVICE_INSTALLER)
 994                 return eject_installer(intf);
 995
 996         switch (udev->speed) {
 997         case USB_SPEED_LOW:
 998         case USB_SPEED_FULL:
 999         case USB_SPEED_HIGH:
1000                 break;
1001         default:
1002                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1003                 r = -ENODEV;
1004                 goto error;
1005         }
1006
1007         usb_reset_device(interface_to_usbdev(intf));
1008
1009         netdev = zd_netdev_alloc(intf);
1010         if (netdev == NULL) {
1011                 r = -ENOMEM;
1012                 goto error;
1013         }
1014
1015         usb = &zd_netdev_mac(netdev)->chip.usb;
1016         usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1017
1018         r = zd_mac_preinit_hw(zd_netdev_mac(netdev));
1019         if (r) {
1020                 dev_dbg_f(&intf->dev,
1021                          "couldn't initialize mac. Error number %d\n", r);
1022                 goto error;
1023         }
1024
1025         r = register_netdev(netdev);
1026         if (r) {
1027                 dev_dbg_f(&intf->dev,
1028                          "couldn't register netdev. Error number %d\n", r);
1029                 goto error;
1030         }
1031
1032         dev_dbg_f(&intf->dev, "successful\n");
1033         dev_info(&intf->dev,"%s\n", netdev->name);
1034         return 0;
1035 error:
1036         usb_reset_device(interface_to_usbdev(intf));
1037         zd_netdev_free(netdev);
1038         return r;
1039 }
1040
1041 static void disconnect(struct usb_interface *intf)
1042 {
1043         struct net_device *netdev = zd_intf_to_netdev(intf);
1044         struct zd_mac *mac = zd_netdev_mac(netdev);
1045         struct zd_usb *usb = &mac->chip.usb;
1046
1047         /* Either something really bad happened, or we're just dealing with
1048          * a DEVICE_INSTALLER. */
1049         if (netdev == NULL)
1050                 return;
1051
1052         dev_dbg_f(zd_usb_dev(usb), "\n");
1053
1054         zd_netdev_disconnect(netdev);
1055
1056         /* Just in case something has gone wrong! */
1057         zd_usb_disable_rx(usb);
1058         zd_usb_disable_int(usb);
1059
1060         /* If the disconnect has been caused by a removal of the
1061          * driver module, the reset allows reloading of the driver. If the
1062          * reset will not be executed here, the upload of the firmware in the
1063          * probe function caused by the reloading of the driver will fail.
1064          */
1065         usb_reset_device(interface_to_usbdev(intf));
1066
1067         zd_netdev_free(netdev);
1068         dev_dbg(&intf->dev, "disconnected\n");
1069 }
1070
1071 static struct usb_driver driver = {
1072         .name           = "zd1211rw",
1073         .id_table       = usb_ids,
1074         .probe          = probe,
1075         .disconnect     = disconnect,
1076 };
1077
1078 struct workqueue_struct *zd_workqueue;
1079
1080 static int __init usb_init(void)
1081 {
1082         int r;
1083
1084         pr_debug("%s usb_init()\n", driver.name);
1085
1086         zd_workqueue = create_singlethread_workqueue(driver.name);
1087         if (zd_workqueue == NULL) {
1088                 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1089                 return -ENOMEM;
1090         }
1091
1092         r = usb_register(&driver);
1093         if (r) {
1094                 destroy_workqueue(zd_workqueue);
1095                 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1096                        driver.name, r);
1097                 return r;
1098         }
1099
1100         pr_debug("%s initialized\n", driver.name);
1101         return 0;
1102 }
1103
1104 static void __exit usb_exit(void)
1105 {
1106         pr_debug("%s usb_exit()\n", driver.name);
1107         usb_deregister(&driver);
1108         destroy_workqueue(zd_workqueue);
1109 }
1110
1111 module_init(usb_init);
1112 module_exit(usb_exit);
1113
1114 static int usb_int_regs_length(unsigned int count)
1115 {
1116         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1117 }
1118
1119 static void prepare_read_regs_int(struct zd_usb *usb)
1120 {
1121         struct zd_usb_interrupt *intr = &usb->intr;
1122
1123         spin_lock_irq(&intr->lock);
1124         intr->read_regs_enabled = 1;
1125         INIT_COMPLETION(intr->read_regs.completion);
1126         spin_unlock_irq(&intr->lock);
1127 }
1128
1129 static void disable_read_regs_int(struct zd_usb *usb)
1130 {
1131         struct zd_usb_interrupt *intr = &usb->intr;
1132
1133         spin_lock_irq(&intr->lock);
1134         intr->read_regs_enabled = 0;
1135         spin_unlock_irq(&intr->lock);
1136 }
1137
1138 static int get_results(struct zd_usb *usb, u16 *values,
1139                        struct usb_req_read_regs *req, unsigned int count)
1140 {
1141         int r;
1142         int i;
1143         struct zd_usb_interrupt *intr = &usb->intr;
1144         struct read_regs_int *rr = &intr->read_regs;
1145         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1146
1147         spin_lock_irq(&intr->lock);
1148
1149         r = -EIO;
1150         /* The created block size seems to be larger than expected.
1151          * However results appear to be correct.
1152          */
1153         if (rr->length < usb_int_regs_length(count)) {
1154                 dev_dbg_f(zd_usb_dev(usb),
1155                          "error: actual length %d less than expected %d\n",
1156                          rr->length, usb_int_regs_length(count));
1157                 goto error_unlock;
1158         }
1159         if (rr->length > sizeof(rr->buffer)) {
1160                 dev_dbg_f(zd_usb_dev(usb),
1161                          "error: actual length %d exceeds buffer size %zu\n",
1162                          rr->length, sizeof(rr->buffer));
1163                 goto error_unlock;
1164         }
1165
1166         for (i = 0; i < count; i++) {
1167                 struct reg_data *rd = &regs->regs[i];
1168                 if (rd->addr != req->addr[i]) {
1169                         dev_dbg_f(zd_usb_dev(usb),
1170                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1171                                  le16_to_cpu(rd->addr),
1172                                  le16_to_cpu(req->addr[i]));
1173                         goto error_unlock;
1174                 }
1175                 values[i] = le16_to_cpu(rd->value);
1176         }
1177
1178         r = 0;
1179 error_unlock:
1180         spin_unlock_irq(&intr->lock);
1181         return r;
1182 }
1183
1184 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1185                      const zd_addr_t *addresses, unsigned int count)
1186 {
1187         int r;
1188         int i, req_len, actual_req_len;
1189         struct usb_device *udev;
1190         struct usb_req_read_regs *req = NULL;
1191         unsigned long timeout;
1192
1193         if (count < 1) {
1194                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1195                 return -EINVAL;
1196         }
1197         if (count > USB_MAX_IOREAD16_COUNT) {
1198                 dev_dbg_f(zd_usb_dev(usb),
1199                          "error: count %u exceeds possible max %u\n",
1200                          count, USB_MAX_IOREAD16_COUNT);
1201                 return -EINVAL;
1202         }
1203         if (in_atomic()) {
1204                 dev_dbg_f(zd_usb_dev(usb),
1205                          "error: io in atomic context not supported\n");
1206                 return -EWOULDBLOCK;
1207         }
1208         if (!usb_int_enabled(usb)) {
1209                  dev_dbg_f(zd_usb_dev(usb),
1210                           "error: usb interrupt not enabled\n");
1211                 return -EWOULDBLOCK;
1212         }
1213
1214         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1215         req = kmalloc(req_len, GFP_KERNEL);
1216         if (!req)
1217                 return -ENOMEM;
1218         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1219         for (i = 0; i < count; i++)
1220                 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1221
1222         udev = zd_usb_to_usbdev(usb);
1223         prepare_read_regs_int(usb);
1224         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1225                          req, req_len, &actual_req_len, 1000 /* ms */);
1226         if (r) {
1227                 dev_dbg_f(zd_usb_dev(usb),
1228                         "error in usb_bulk_msg(). Error number %d\n", r);
1229                 goto error;
1230         }
1231         if (req_len != actual_req_len) {
1232                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1233                         " req_len %d != actual_req_len %d\n",
1234                         req_len, actual_req_len);
1235                 r = -EIO;
1236                 goto error;
1237         }
1238
1239         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1240                                               msecs_to_jiffies(1000));
1241         if (!timeout) {
1242                 disable_read_regs_int(usb);
1243                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1244                 r = -ETIMEDOUT;
1245                 goto error;
1246         }
1247
1248         r = get_results(usb, values, req, count);
1249 error:
1250         kfree(req);
1251         return r;
1252 }
1253
1254 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1255                       unsigned int count)
1256 {
1257         int r;
1258         struct usb_device *udev;
1259         struct usb_req_write_regs *req = NULL;
1260         int i, req_len, actual_req_len;
1261
1262         if (count == 0)
1263                 return 0;
1264         if (count > USB_MAX_IOWRITE16_COUNT) {
1265                 dev_dbg_f(zd_usb_dev(usb),
1266                         "error: count %u exceeds possible max %u\n",
1267                         count, USB_MAX_IOWRITE16_COUNT);
1268                 return -EINVAL;
1269         }
1270         if (in_atomic()) {
1271                 dev_dbg_f(zd_usb_dev(usb),
1272                         "error: io in atomic context not supported\n");
1273                 return -EWOULDBLOCK;
1274         }
1275
1276         req_len = sizeof(struct usb_req_write_regs) +
1277                   count * sizeof(struct reg_data);
1278         req = kmalloc(req_len, GFP_KERNEL);
1279         if (!req)
1280                 return -ENOMEM;
1281
1282         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1283         for (i = 0; i < count; i++) {
1284                 struct reg_data *rw  = &req->reg_writes[i];
1285                 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1286                 rw->value = cpu_to_le16(ioreqs[i].value);
1287         }
1288
1289         udev = zd_usb_to_usbdev(usb);
1290         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1291                          req, req_len, &actual_req_len, 1000 /* ms */);
1292         if (r) {
1293                 dev_dbg_f(zd_usb_dev(usb),
1294                         "error in usb_bulk_msg(). Error number %d\n", r);
1295                 goto error;
1296         }
1297         if (req_len != actual_req_len) {
1298                 dev_dbg_f(zd_usb_dev(usb),
1299                         "error in usb_bulk_msg()"
1300                         " req_len %d != actual_req_len %d\n",
1301                         req_len, actual_req_len);
1302                 r = -EIO;
1303                 goto error;
1304         }
1305
1306         /* FALL-THROUGH with r == 0 */
1307 error:
1308         kfree(req);
1309         return r;
1310 }
1311
1312 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1313 {
1314         int r;
1315         struct usb_device *udev;
1316         struct usb_req_rfwrite *req = NULL;
1317         int i, req_len, actual_req_len;
1318         u16 bit_value_template;
1319
1320         if (in_atomic()) {
1321                 dev_dbg_f(zd_usb_dev(usb),
1322                         "error: io in atomic context not supported\n");
1323                 return -EWOULDBLOCK;
1324         }
1325         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1326                 dev_dbg_f(zd_usb_dev(usb),
1327                         "error: bits %d are smaller than"
1328                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1329                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1330                 return -EINVAL;
1331         }
1332         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1333                 dev_dbg_f(zd_usb_dev(usb),
1334                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1335                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1336                 return -EINVAL;
1337         }
1338 #ifdef DEBUG
1339         if (value & (~0UL << bits)) {
1340                 dev_dbg_f(zd_usb_dev(usb),
1341                         "error: value %#09x has bits >= %d set\n",
1342                         value, bits);
1343                 return -EINVAL;
1344         }
1345 #endif /* DEBUG */
1346
1347         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1348
1349         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1350         if (r) {
1351                 dev_dbg_f(zd_usb_dev(usb),
1352                         "error %d: Couldn't read CR203\n", r);
1353                 goto out;
1354         }
1355         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1356
1357         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1358         req = kmalloc(req_len, GFP_KERNEL);
1359         if (!req)
1360                 return -ENOMEM;
1361
1362         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1363         /* 1: 3683a, but not used in ZYDAS driver */
1364         req->value = cpu_to_le16(2);
1365         req->bits = cpu_to_le16(bits);
1366
1367         for (i = 0; i < bits; i++) {
1368                 u16 bv = bit_value_template;
1369                 if (value & (1 << (bits-1-i)))
1370                         bv |= RF_DATA;
1371                 req->bit_values[i] = cpu_to_le16(bv);
1372         }
1373
1374         udev = zd_usb_to_usbdev(usb);
1375         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1376                          req, req_len, &actual_req_len, 1000 /* ms */);
1377         if (r) {
1378                 dev_dbg_f(zd_usb_dev(usb),
1379                         "error in usb_bulk_msg(). Error number %d\n", r);
1380                 goto out;
1381         }
1382         if (req_len != actual_req_len) {
1383                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1384                         " req_len %d != actual_req_len %d\n",
1385                         req_len, actual_req_len);
1386                 r = -EIO;
1387                 goto out;
1388         }
1389
1390         /* FALL-THROUGH with r == 0 */
1391 out:
1392         kfree(req);
1393         return r;
1394 }