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 <asm/unaligned.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 <net/ieee80211.h>
  27
  28 #include "zd_def.h"
  29 #include "zd_netdev.h"
  30 #include "zd_mac.h"
  31 #include "zd_usb.h"
  32 #include "zd_util.h"
  33
  34 static struct usb_device_id usb_ids[] = {
  35         /* ZD1211 */
  36         { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
  37         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
  38         { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
  39         { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
  40         { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
  41         { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
  42         /* ZD1211B */
  43         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  44         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  45         {}
  46 };
  47
  48 MODULE_LICENSE("GPL");
  49 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
  50 MODULE_AUTHOR("Ulrich Kunitz");
  51 MODULE_AUTHOR("Daniel Drake");
  52 MODULE_VERSION("1.0");
  53 MODULE_DEVICE_TABLE(usb, usb_ids);
  54
  55 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
  56 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
  57
  58 /* register address handling */
  59
  60 #ifdef DEBUG
  61 static int check_addr(struct zd_usb *usb, zd_addr_t addr)
  62 {
  63         u32 base = ZD_ADDR_BASE(addr);
  64         u32 offset = ZD_OFFSET(addr);
  65
  66         if ((u32)addr & ADDR_ZERO_MASK)
  67                 goto invalid_address;
  68         switch (base) {
  69         case USB_BASE:
  70                 break;
  71         case CR_BASE:
  72                 if (offset > CR_MAX_OFFSET) {
  73                         dev_dbg(zd_usb_dev(usb),
  74                                 "CR offset %#010x larger than"
  75                                 " CR_MAX_OFFSET %#10x\n",
  76                                 offset, CR_MAX_OFFSET);
  77                         goto invalid_address;
  78                 }
  79                 if (offset & 1) {
  80                         dev_dbg(zd_usb_dev(usb),
  81                                 "CR offset %#010x is not a multiple of 2\n",
  82                                 offset);
  83                         goto invalid_address;
  84                 }
  85                 break;
  86         case E2P_BASE:
  87                 if (offset > E2P_MAX_OFFSET) {
  88                         dev_dbg(zd_usb_dev(usb),
  89                                 "E2P offset %#010x larger than"
  90                                 " E2P_MAX_OFFSET %#010x\n",
  91                                 offset, E2P_MAX_OFFSET);
  92                         goto invalid_address;
  93                 }
  94                 break;
  95         case FW_BASE:
  96                 if (!usb->fw_base_offset) {
  97                         dev_dbg(zd_usb_dev(usb),
  98                                "ERROR: fw base offset has not been set\n");
  99                         return -EAGAIN;
 100                 }
 101                 if (offset > FW_MAX_OFFSET) {
 102                         dev_dbg(zd_usb_dev(usb),
 103                                 "FW offset %#10x is larger than"
 104                                 " FW_MAX_OFFSET %#010x\n",
 105                                 offset, FW_MAX_OFFSET);
 106                         goto invalid_address;
 107                 }
 108                 break;
 109         default:
 110                 dev_dbg(zd_usb_dev(usb),
 111                         "address has unsupported base %#010x\n", addr);
 112                 goto invalid_address;
 113         }
 114
 115         return 0;
 116 invalid_address:
 117         dev_dbg(zd_usb_dev(usb),
 118                 "ERROR: invalid address: %#010x\n", addr);
 119         return -EINVAL;
 120 }
 121 #endif /* DEBUG */
 122
 123 static u16 usb_addr(struct zd_usb *usb, zd_addr_t addr)
 124 {
 125         u32 base;
 126         u16 offset;
 127
 128         base = ZD_ADDR_BASE(addr);
 129         offset = ZD_OFFSET(addr);
 130
 131         ZD_ASSERT(check_addr(usb, addr) == 0);
 132
 133         switch (base) {
 134         case CR_BASE:
 135                 offset += CR_BASE_OFFSET;
 136                 break;
 137         case E2P_BASE:
 138                 offset += E2P_BASE_OFFSET;
 139                 break;
 140         case FW_BASE:
 141                 offset += usb->fw_base_offset;
 142                 break;
 143         }
 144
 145         return offset;
 146 }
 147
 148 /* USB device initialization */
 149
 150 static int request_fw_file(
 151         const struct firmware **fw, const char *name, struct device *device)
 152 {
 153         int r;
 154
 155         dev_dbg_f(device, "fw name %s\n", name);
 156
 157         r = request_firmware(fw, name, device);
 158         if (r)
 159                 dev_err(device,
 160                        "Could not load firmware file %s. Error number %d\n",
 161                        name, r);
 162         return r;
 163 }
 164
 165 static inline u16 get_bcdDevice(const struct usb_device *udev)
 166 {
 167         return le16_to_cpu(udev->descriptor.bcdDevice);
 168 }
 169
 170 enum upload_code_flags {
 171         REBOOT = 1,
 172 };
 173
 174 /* Ensures that MAX_TRANSFER_SIZE is even. */
 175 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 176
 177 static int upload_code(struct usb_device *udev,
 178         const u8 *data, size_t size, u16 code_offset, int flags)
 179 {
 180         u8 *p;
 181         int r;
 182
 183         /* USB request blocks need "kmalloced" buffers.
 184          */
 185         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 186         if (!p) {
 187                 dev_err(&udev->dev, "out of memory\n");
 188                 r = -ENOMEM;
 189                 goto error;
 190         }
 191
 192         size &= ~1;
 193         while (size > 0) {
 194                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 195                         size : MAX_TRANSFER_SIZE;
 196
 197                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 198
 199                 memcpy(p, data, transfer_size);
 200                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 201                         USB_REQ_FIRMWARE_DOWNLOAD,
 202                         USB_DIR_OUT | USB_TYPE_VENDOR,
 203                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 204                 if (r < 0) {
 205                         dev_err(&udev->dev,
 206                                "USB control request for firmware upload"
 207                                " failed. Error number %d\n", r);
 208                         goto error;
 209                 }
 210                 transfer_size = r & ~1;
 211
 212                 size -= transfer_size;
 213                 data += transfer_size;
 214                 code_offset += transfer_size/sizeof(u16);
 215         }
 216
 217         if (flags & REBOOT) {
 218                 u8 ret;
 219
 220                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 221                         USB_REQ_FIRMWARE_CONFIRM,
 222                         USB_DIR_IN | USB_TYPE_VENDOR,
 223                         0, 0, &ret, sizeof(ret), 5000 /* ms */);
 224                 if (r != sizeof(ret)) {
 225                         dev_err(&udev->dev,
 226                                 "control request firmeware confirmation failed."
 227                                 " Return value %d\n", r);
 228                         if (r >= 0)
 229                                 r = -ENODEV;
 230                         goto error;
 231                 }
 232                 if (ret & 0x80) {
 233                         dev_err(&udev->dev,
 234                                 "Internal error while downloading."
 235                                 " Firmware confirm return value %#04x\n",
 236                                 (unsigned int)ret);
 237                         r = -ENODEV;
 238                         goto error;
 239                 }
 240                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 241                         (unsigned int)ret);
 242         }
 243
 244         r = 0;
 245 error:
 246         kfree(p);
 247         return r;
 248 }
 249
 250 static u16 get_word(const void *data, u16 offset)
 251 {
 252         const __le16 *p = data;
 253         return le16_to_cpu(p[offset]);
 254 }
 255
 256 static char *get_fw_name(char *buffer, size_t size, u8 device_type,
 257                        const char* postfix)
 258 {
 259         scnprintf(buffer, size, "%s%s",
 260                 device_type == DEVICE_ZD1211B ?
 261                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 262                 postfix);
 263         return buffer;
 264 }
 265
 266 static int upload_firmware(struct usb_device *udev, u8 device_type)
 267 {
 268         int r;
 269         u16 fw_bcdDevice;
 270         u16 bcdDevice;
 271         const struct firmware *ub_fw = NULL;
 272         const struct firmware *uph_fw = NULL;
 273         char fw_name[128];
 274
 275         bcdDevice = get_bcdDevice(udev);
 276
 277         r = request_fw_file(&ub_fw,
 278                 get_fw_name(fw_name, sizeof(fw_name), device_type,  "ub"),
 279                 &udev->dev);
 280         if (r)
 281                 goto error;
 282
 283         fw_bcdDevice = get_word(ub_fw->data, EEPROM_REGS_OFFSET);
 284
 285         /* FIXME: do we have any reason to perform the kludge that the vendor
 286          * driver does when there is a version mismatch? (their driver uploads
 287          * different firmwares and stuff)
 288          */
 289         if (fw_bcdDevice != bcdDevice) {
 290                 dev_info(&udev->dev,
 291                         "firmware device id %#06x and actual device id "
 292                         "%#06x differ, continuing anyway\n",
 293                         fw_bcdDevice, bcdDevice);
 294         } else {
 295                 dev_dbg_f(&udev->dev,
 296                         "firmware device id %#06x is equal to the "
 297                         "actual device id\n", fw_bcdDevice);
 298         }
 299
 300
 301         r = request_fw_file(&uph_fw,
 302                 get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"),
 303                 &udev->dev);
 304         if (r)
 305                 goto error;
 306
 307         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START_OFFSET,
 308                         REBOOT);
 309         if (r) {
 310                 dev_err(&udev->dev,
 311                         "Could not upload firmware code uph. Error number %d\n",
 312                         r);
 313         }
 314
 315         /* FALL-THROUGH */
 316 error:
 317         release_firmware(ub_fw);
 318         release_firmware(uph_fw);
 319         return r;
 320 }
 321
 322 static void disable_read_regs_int(struct zd_usb *usb)
 323 {
 324         struct zd_usb_interrupt *intr = &usb->intr;
 325
 326         ZD_ASSERT(in_interrupt());
 327         spin_lock(&intr->lock);
 328         intr->read_regs_enabled = 0;
 329         spin_unlock(&intr->lock);
 330 }
 331
 332 #define urb_dev(urb) (&(urb)->dev->dev)
 333
 334 static inline void handle_regs_int(struct urb *urb)
 335 {
 336         struct zd_usb *usb = urb->context;
 337         struct zd_usb_interrupt *intr = &usb->intr;
 338         int len;
 339
 340         ZD_ASSERT(in_interrupt());
 341         spin_lock(&intr->lock);
 342
 343         if (intr->read_regs_enabled) {
 344                 intr->read_regs.length = len = urb->actual_length;
 345
 346                 if (len > sizeof(intr->read_regs.buffer))
 347                         len = sizeof(intr->read_regs.buffer);
 348                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 349                 intr->read_regs_enabled = 0;
 350                 complete(&intr->read_regs.completion);
 351                 goto out;
 352         }
 353
 354         dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
 355 out:
 356         spin_unlock(&intr->lock);
 357 }
 358
 359 static inline void handle_retry_failed_int(struct urb *urb)
 360 {
 361         dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
 362 }
 363
 364
 365 static void int_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
 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_NOFS);
 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_NOFS);
 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_NOFS);
 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                 return;
 536         }
 537         length_info = (struct rx_length_info *)
 538                 (buffer + length - sizeof(struct rx_length_info));
 539
 540         /* It might be that three frames are merged into a single URB
 541          * transaction. We have to check for the length info tag.
 542          *
 543          * While testing we discovered that length_info might be unaligned,
 544          * because if USB transactions are merged, the last packet will not
 545          * be padded. Unaligned access might also happen if the length_info
 546          * structure is not present.
 547          */
 548         if (get_unaligned(&length_info->tag) == RX_LENGTH_INFO_TAG) {
 549                 unsigned int l, k, n;
 550                 for (i = 0, l = 0;; i++) {
 551                         k = le16_to_cpu(get_unaligned(
 552                                 &length_info->length[i]));
 553                         n = l+k;
 554                         if (n > length)
 555                                 return;
 556                         zd_mac_rx(mac, buffer+l, k);
 557                         if (i >= 2)
 558                                 return;
 559                         l = (n+3) & ~3;
 560                 }
 561         } else {
 562                 zd_mac_rx(mac, buffer, length);
 563         }
 564 }
 565
 566 static void rx_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
 567 {
 568         struct zd_usb *usb;
 569         struct zd_usb_rx *rx;
 570         const u8 *buffer;
 571         unsigned int length;
 572
 573         switch (urb->status) {
 574         case 0:
 575                 break;
 576         case -ESHUTDOWN:
 577         case -EINVAL:
 578         case -ENODEV:
 579         case -ENOENT:
 580         case -ECONNRESET:
 581         case -EPIPE:
 582                 return;
 583         default:
 584                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 585                 goto resubmit;
 586         }
 587
 588         buffer = urb->transfer_buffer;
 589         length = urb->actual_length;
 590         usb = urb->context;
 591         rx = &usb->rx;
 592
 593         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 594                 /* If there is an old first fragment, we don't care. */
 595                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 596                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 597                 spin_lock(&rx->lock);
 598                 memcpy(rx->fragment, buffer, length);
 599                 rx->fragment_length = length;
 600                 spin_unlock(&rx->lock);
 601                 goto resubmit;
 602         }
 603
 604         spin_lock(&rx->lock);
 605         if (rx->fragment_length > 0) {
 606                 /* We are on a second fragment, we believe */
 607                 ZD_ASSERT(length + rx->fragment_length <=
 608                           ARRAY_SIZE(rx->fragment));
 609                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 610                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 611                 handle_rx_packet(usb, rx->fragment,
 612                                  rx->fragment_length + length);
 613                 rx->fragment_length = 0;
 614                 spin_unlock(&rx->lock);
 615         } else {
 616                 spin_unlock(&rx->lock);
 617                 handle_rx_packet(usb, buffer, length);
 618         }
 619
 620 resubmit:
 621         usb_submit_urb(urb, GFP_ATOMIC);
 622 }
 623
 624 struct urb *alloc_urb(struct zd_usb *usb)
 625 {
 626         struct usb_device *udev = zd_usb_to_usbdev(usb);
 627         struct urb *urb;
 628         void *buffer;
 629
 630         urb = usb_alloc_urb(0, GFP_NOFS);
 631         if (!urb)
 632                 return NULL;
 633         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_NOFS,
 634                                   &urb->transfer_dma);
 635         if (!buffer) {
 636                 usb_free_urb(urb);
 637                 return NULL;
 638         }
 639
 640         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 641                           buffer, USB_MAX_RX_SIZE,
 642                           rx_urb_complete, usb);
 643         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 644
 645         return urb;
 646 }
 647
 648 void free_urb(struct urb *urb)
 649 {
 650         if (!urb)
 651                 return;
 652         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 653                         urb->transfer_buffer, urb->transfer_dma);
 654         usb_free_urb(urb);
 655 }
 656
 657 int zd_usb_enable_rx(struct zd_usb *usb)
 658 {
 659         int i, r;
 660         struct zd_usb_rx *rx = &usb->rx;
 661         struct urb **urbs;
 662
 663         dev_dbg_f(zd_usb_dev(usb), "\n");
 664
 665         r = -ENOMEM;
 666         urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_NOFS);
 667         if (!urbs)
 668                 goto error;
 669         for (i = 0; i < URBS_COUNT; i++) {
 670                 urbs[i] = alloc_urb(usb);
 671                 if (!urbs[i])
 672                         goto error;
 673         }
 674
 675         ZD_ASSERT(!irqs_disabled());
 676         spin_lock_irq(&rx->lock);
 677         if (rx->urbs) {
 678                 spin_unlock_irq(&rx->lock);
 679                 r = 0;
 680                 goto error;
 681         }
 682         rx->urbs = urbs;
 683         rx->urbs_count = URBS_COUNT;
 684         spin_unlock_irq(&rx->lock);
 685
 686         for (i = 0; i < URBS_COUNT; i++) {
 687                 r = usb_submit_urb(urbs[i], GFP_NOFS);
 688                 if (r)
 689                         goto error_submit;
 690         }
 691
 692         return 0;
 693 error_submit:
 694         for (i = 0; i < URBS_COUNT; i++) {
 695                 usb_kill_urb(urbs[i]);
 696         }
 697         spin_lock_irq(&rx->lock);
 698         rx->urbs = NULL;
 699         rx->urbs_count = 0;
 700         spin_unlock_irq(&rx->lock);
 701 error:
 702         if (urbs) {
 703                 for (i = 0; i < URBS_COUNT; i++)
 704                         free_urb(urbs[i]);
 705         }
 706         return r;
 707 }
 708
 709 void zd_usb_disable_rx(struct zd_usb *usb)
 710 {
 711         int i;
 712         unsigned long flags;
 713         struct urb **urbs;
 714         unsigned int count;
 715         struct zd_usb_rx *rx = &usb->rx;
 716
 717         spin_lock_irqsave(&rx->lock, flags);
 718         urbs = rx->urbs;
 719         count = rx->urbs_count;
 720         spin_unlock_irqrestore(&rx->lock, flags);
 721         if (!urbs)
 722                 return;
 723
 724         for (i = 0; i < count; i++) {
 725                 usb_kill_urb(urbs[i]);
 726                 free_urb(urbs[i]);
 727         }
 728         kfree(urbs);
 729
 730         spin_lock_irqsave(&rx->lock, flags);
 731         rx->urbs = NULL;
 732         rx->urbs_count = 0;
 733         spin_unlock_irqrestore(&rx->lock, flags);
 734 }
 735
 736 static void tx_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
 737 {
 738         int r;
 739
 740         switch (urb->status) {
 741         case 0:
 742                 break;
 743         case -ESHUTDOWN:
 744         case -EINVAL:
 745         case -ENODEV:
 746         case -ENOENT:
 747         case -ECONNRESET:
 748         case -EPIPE:
 749                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 750                 break;
 751         default:
 752                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 753                 goto resubmit;
 754         }
 755 free_urb:
 756         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 757                         urb->transfer_buffer, urb->transfer_dma);
 758         usb_free_urb(urb);
 759         return;
 760 resubmit:
 761         r = usb_submit_urb(urb, GFP_ATOMIC);
 762         if (r) {
 763                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 764                 goto free_urb;
 765         }
 766 }
 767
 768 /* Puts the frame on the USB endpoint. It doesn't wait for
 769  * completion. The frame must contain the control set.
 770  */
 771 int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
 772 {
 773         int r;
 774         struct usb_device *udev = zd_usb_to_usbdev(usb);
 775         struct urb *urb;
 776         void *buffer;
 777
 778         urb = usb_alloc_urb(0, GFP_ATOMIC);
 779         if (!urb) {
 780                 r = -ENOMEM;
 781                 goto out;
 782         }
 783
 784         buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
 785                                   &urb->transfer_dma);
 786         if (!buffer) {
 787                 r = -ENOMEM;
 788                 goto error_free_urb;
 789         }
 790         memcpy(buffer, frame, length);
 791
 792         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 793                           buffer, length, tx_urb_complete, NULL);
 794         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 795
 796         r = usb_submit_urb(urb, GFP_ATOMIC);
 797         if (r)
 798                 goto error;
 799         return 0;
 800 error:
 801         usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
 802                         urb->transfer_dma);
 803 error_free_urb:
 804         usb_free_urb(urb);
 805 out:
 806         return r;
 807 }
 808
 809 static inline void init_usb_interrupt(struct zd_usb *usb)
 810 {
 811         struct zd_usb_interrupt *intr = &usb->intr;
 812
 813         spin_lock_init(&intr->lock);
 814         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 815         init_completion(&intr->read_regs.completion);
 816         intr->read_regs.cr_int_addr = cpu_to_le16(usb_addr(usb, CR_INTERRUPT));
 817 }
 818
 819 static inline void init_usb_rx(struct zd_usb *usb)
 820 {
 821         struct zd_usb_rx *rx = &usb->rx;
 822         spin_lock_init(&rx->lock);
 823         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 824                 rx->usb_packet_size = 512;
 825         } else {
 826                 rx->usb_packet_size = 64;
 827         }
 828         ZD_ASSERT(rx->fragment_length == 0);
 829 }
 830
 831 static inline void init_usb_tx(struct zd_usb *usb)
 832 {
 833         /* FIXME: at this point we will allocate a fixed number of urb's for
 834          * use in a cyclic scheme */
 835 }
 836
 837 void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
 838                  struct usb_interface *intf)
 839 {
 840         memset(usb, 0, sizeof(*usb));
 841         usb->intf = usb_get_intf(intf);
 842         usb_set_intfdata(usb->intf, netdev);
 843         init_usb_interrupt(usb);
 844         init_usb_tx(usb);
 845         init_usb_rx(usb);
 846 }
 847
 848 int zd_usb_init_hw(struct zd_usb *usb)
 849 {
 850         int r;
 851         struct zd_chip *chip = zd_usb_to_chip(usb);
 852
 853         ZD_ASSERT(mutex_is_locked(&chip->mutex));
 854         r = zd_ioread16_locked(chip, &usb->fw_base_offset,
 855                         USB_REG((u16)FW_BASE_ADDR_OFFSET));
 856         if (r)
 857                 return r;
 858         dev_dbg_f(zd_usb_dev(usb), "fw_base_offset: %#06hx\n",
 859                  usb->fw_base_offset);
 860
 861         return 0;
 862 }
 863
 864 void zd_usb_clear(struct zd_usb *usb)
 865 {
 866         usb_set_intfdata(usb->intf, NULL);
 867         usb_put_intf(usb->intf);
 868         memset(usb, 0, sizeof(*usb));
 869         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
 870 }
 871
 872 static const char *speed(enum usb_device_speed speed)
 873 {
 874         switch (speed) {
 875         case USB_SPEED_LOW:
 876                 return "low";
 877         case USB_SPEED_FULL:
 878                 return "full";
 879         case USB_SPEED_HIGH:
 880                 return "high";
 881         default:
 882                 return "unknown speed";
 883         }
 884 }
 885
 886 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
 887 {
 888         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
 889                 le16_to_cpu(udev->descriptor.idVendor),
 890                 le16_to_cpu(udev->descriptor.idProduct),
 891                 get_bcdDevice(udev),
 892                 speed(udev->speed));
 893 }
 894
 895 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
 896 {
 897         struct usb_device *udev = interface_to_usbdev(usb->intf);
 898         return scnprint_id(udev, buffer, size);
 899 }
 900
 901 #ifdef DEBUG
 902 static void print_id(struct usb_device *udev)
 903 {
 904         char buffer[40];
 905
 906         scnprint_id(udev, buffer, sizeof(buffer));
 907         buffer[sizeof(buffer)-1] = 0;
 908         dev_dbg_f(&udev->dev, "%s\n", buffer);
 909 }
 910 #else
 911 #define print_id(udev) do { } while (0)
 912 #endif
 913
 914 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
 915 {
 916         int r;
 917         struct usb_device *udev = interface_to_usbdev(intf);
 918         struct net_device *netdev = NULL;
 919
 920         print_id(udev);
 921
 922         switch (udev->speed) {
 923         case USB_SPEED_LOW:
 924         case USB_SPEED_FULL:
 925         case USB_SPEED_HIGH:
 926                 break;
 927         default:
 928                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
 929                 r = -ENODEV;
 930                 goto error;
 931         }
 932
 933         netdev = zd_netdev_alloc(intf);
 934         if (netdev == NULL) {
 935                 r = -ENOMEM;
 936                 goto error;
 937         }
 938
 939         r = upload_firmware(udev, id->driver_info);
 940         if (r) {
 941                 dev_err(&intf->dev,
 942                        "couldn't load firmware. Error number %d\n", r);
 943                 goto error;
 944         }
 945
 946         r = usb_reset_configuration(udev);
 947         if (r) {
 948                 dev_dbg_f(&intf->dev,
 949                         "couldn't reset configuration. Error number %d\n", r);
 950                 goto error;
 951         }
 952
 953         /* At this point the interrupt endpoint is not generally enabled. We
 954          * save the USB bandwidth until the network device is opened. But
 955          * notify that the initialization of the MAC will require the
 956          * interrupts to be temporary enabled.
 957          */
 958         r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
 959         if (r) {
 960                 dev_dbg_f(&intf->dev,
 961                          "couldn't initialize mac. Error number %d\n", r);
 962                 goto error;
 963         }
 964
 965         r = register_netdev(netdev);
 966         if (r) {
 967                 dev_dbg_f(&intf->dev,
 968                          "couldn't register netdev. Error number %d\n", r);
 969                 goto error;
 970         }
 971
 972         dev_dbg_f(&intf->dev, "successful\n");
 973         dev_info(&intf->dev,"%s\n", netdev->name);
 974         return 0;
 975 error:
 976         usb_reset_device(interface_to_usbdev(intf));
 977         zd_netdev_free(netdev);
 978         return r;
 979 }
 980
 981 static void disconnect(struct usb_interface *intf)
 982 {
 983         struct net_device *netdev = zd_intf_to_netdev(intf);
 984         struct zd_mac *mac = zd_netdev_mac(netdev);
 985         struct zd_usb *usb = &mac->chip.usb;
 986
 987         dev_dbg_f(zd_usb_dev(usb), "\n");
 988
 989         zd_netdev_disconnect(netdev);
 990
 991         /* Just in case something has gone wrong! */
 992         zd_usb_disable_rx(usb);
 993         zd_usb_disable_int(usb);
 994
 995         /* If the disconnect has been caused by a removal of the
 996          * driver module, the reset allows reloading of the driver. If the
 997          * reset will not be executed here, the upload of the firmware in the
 998          * probe function caused by the reloading of the driver will fail.
 999          */
1000         usb_reset_device(interface_to_usbdev(intf));
1001
1002         /* If somebody still waits on this lock now, this is an error. */
1003         zd_netdev_free(netdev);
1004         dev_dbg(&intf->dev, "disconnected\n");
1005 }
1006
1007 static struct usb_driver driver = {
1008         .name           = "zd1211rw",
1009         .id_table       = usb_ids,
1010         .probe          = probe,
1011         .disconnect     = disconnect,
1012 };
1013
1014 static int __init usb_init(void)
1015 {
1016         int r;
1017
1018         pr_debug("usb_init()\n");
1019
1020         r = usb_register(&driver);
1021         if (r) {
1022                 printk(KERN_ERR "usb_register() failed. Error number %d\n", r);
1023                 return r;
1024         }
1025
1026         pr_debug("zd1211rw initialized\n");
1027         return 0;
1028 }
1029
1030 static void __exit usb_exit(void)
1031 {
1032         pr_debug("usb_exit()\n");
1033         usb_deregister(&driver);
1034 }
1035
1036 module_init(usb_init);
1037 module_exit(usb_exit);
1038
1039 static int usb_int_regs_length(unsigned int count)
1040 {
1041         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1042 }
1043
1044 static void prepare_read_regs_int(struct zd_usb *usb)
1045 {
1046         struct zd_usb_interrupt *intr = &usb->intr;
1047
1048         spin_lock(&intr->lock);
1049         intr->read_regs_enabled = 1;
1050         INIT_COMPLETION(intr->read_regs.completion);
1051         spin_unlock(&intr->lock);
1052 }
1053
1054 static int get_results(struct zd_usb *usb, u16 *values,
1055                        struct usb_req_read_regs *req, unsigned int count)
1056 {
1057         int r;
1058         int i;
1059         struct zd_usb_interrupt *intr = &usb->intr;
1060         struct read_regs_int *rr = &intr->read_regs;
1061         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1062
1063         spin_lock(&intr->lock);
1064
1065         r = -EIO;
1066         /* The created block size seems to be larger than expected.
1067          * However results appear to be correct.
1068          */
1069         if (rr->length < usb_int_regs_length(count)) {
1070                 dev_dbg_f(zd_usb_dev(usb),
1071                          "error: actual length %d less than expected %d\n",
1072                          rr->length, usb_int_regs_length(count));
1073                 goto error_unlock;
1074         }
1075         if (rr->length > sizeof(rr->buffer)) {
1076                 dev_dbg_f(zd_usb_dev(usb),
1077                          "error: actual length %d exceeds buffer size %zu\n",
1078                          rr->length, sizeof(rr->buffer));
1079                 goto error_unlock;
1080         }
1081
1082         for (i = 0; i < count; i++) {
1083                 struct reg_data *rd = &regs->regs[i];
1084                 if (rd->addr != req->addr[i]) {
1085                         dev_dbg_f(zd_usb_dev(usb),
1086                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1087                                  le16_to_cpu(rd->addr),
1088                                  le16_to_cpu(req->addr[i]));
1089                         goto error_unlock;
1090                 }
1091                 values[i] = le16_to_cpu(rd->value);
1092         }
1093
1094         r = 0;
1095 error_unlock:
1096         spin_unlock(&intr->lock);
1097         return r;
1098 }
1099
1100 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1101                      const zd_addr_t *addresses, unsigned int count)
1102 {
1103         int r;
1104         int i, req_len, actual_req_len;
1105         struct usb_device *udev;
1106         struct usb_req_read_regs *req = NULL;
1107         unsigned long timeout;
1108
1109         if (count < 1) {
1110                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1111                 return -EINVAL;
1112         }
1113         if (count > USB_MAX_IOREAD16_COUNT) {
1114                 dev_dbg_f(zd_usb_dev(usb),
1115                          "error: count %u exceeds possible max %u\n",
1116                          count, USB_MAX_IOREAD16_COUNT);
1117                 return -EINVAL;
1118         }
1119         if (in_atomic()) {
1120                 dev_dbg_f(zd_usb_dev(usb),
1121                          "error: io in atomic context not supported\n");
1122                 return -EWOULDBLOCK;
1123         }
1124         if (!usb_int_enabled(usb)) {
1125                  dev_dbg_f(zd_usb_dev(usb),
1126                           "error: usb interrupt not enabled\n");
1127                 return -EWOULDBLOCK;
1128         }
1129
1130         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1131         req = kmalloc(req_len, GFP_NOFS);
1132         if (!req)
1133                 return -ENOMEM;
1134         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1135         for (i = 0; i < count; i++)
1136                 req->addr[i] = cpu_to_le16(usb_addr(usb, addresses[i]));
1137
1138         udev = zd_usb_to_usbdev(usb);
1139         prepare_read_regs_int(usb);
1140         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1141                          req, req_len, &actual_req_len, 1000 /* ms */);
1142         if (r) {
1143                 dev_dbg_f(zd_usb_dev(usb),
1144                         "error in usb_bulk_msg(). Error number %d\n", r);
1145                 goto error;
1146         }
1147         if (req_len != actual_req_len) {
1148                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1149                         " req_len %d != actual_req_len %d\n",
1150                         req_len, actual_req_len);
1151                 r = -EIO;
1152                 goto error;
1153         }
1154
1155         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1156                                               msecs_to_jiffies(1000));
1157         if (!timeout) {
1158                 disable_read_regs_int(usb);
1159                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1160                 r = -ETIMEDOUT;
1161                 goto error;
1162         }
1163
1164         r = get_results(usb, values, req, count);
1165 error:
1166         kfree(req);
1167         return r;
1168 }
1169
1170 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1171                       unsigned int count)
1172 {
1173         int r;
1174         struct usb_device *udev;
1175         struct usb_req_write_regs *req = NULL;
1176         int i, req_len, actual_req_len;
1177
1178         if (count == 0)
1179                 return 0;
1180         if (count > USB_MAX_IOWRITE16_COUNT) {
1181                 dev_dbg_f(zd_usb_dev(usb),
1182                         "error: count %u exceeds possible max %u\n",
1183                         count, USB_MAX_IOWRITE16_COUNT);
1184                 return -EINVAL;
1185         }
1186         if (in_atomic()) {
1187                 dev_dbg_f(zd_usb_dev(usb),
1188                         "error: io in atomic context not supported\n");
1189                 return -EWOULDBLOCK;
1190         }
1191
1192         req_len = sizeof(struct usb_req_write_regs) +
1193                   count * sizeof(struct reg_data);
1194         req = kmalloc(req_len, GFP_NOFS);
1195         if (!req)
1196                 return -ENOMEM;
1197
1198         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1199         for (i = 0; i < count; i++) {
1200                 struct reg_data *rw  = &req->reg_writes[i];
1201                 rw->addr = cpu_to_le16(usb_addr(usb, ioreqs[i].addr));
1202                 rw->value = cpu_to_le16(ioreqs[i].value);
1203         }
1204
1205         udev = zd_usb_to_usbdev(usb);
1206         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1207                          req, req_len, &actual_req_len, 1000 /* ms */);
1208         if (r) {
1209                 dev_dbg_f(zd_usb_dev(usb),
1210                         "error in usb_bulk_msg(). Error number %d\n", r);
1211                 goto error;
1212         }
1213         if (req_len != actual_req_len) {
1214                 dev_dbg_f(zd_usb_dev(usb),
1215                         "error in usb_bulk_msg()"
1216                         " req_len %d != actual_req_len %d\n",
1217                         req_len, actual_req_len);
1218                 r = -EIO;
1219                 goto error;
1220         }
1221
1222         /* FALL-THROUGH with r == 0 */
1223 error:
1224         kfree(req);
1225         return r;
1226 }
1227
1228 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1229 {
1230         int r;
1231         struct usb_device *udev;
1232         struct usb_req_rfwrite *req = NULL;
1233         int i, req_len, actual_req_len;
1234         u16 bit_value_template;
1235
1236         if (in_atomic()) {
1237                 dev_dbg_f(zd_usb_dev(usb),
1238                         "error: io in atomic context not supported\n");
1239                 return -EWOULDBLOCK;
1240         }
1241         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1242                 dev_dbg_f(zd_usb_dev(usb),
1243                         "error: bits %d are smaller than"
1244                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1245                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1246                 return -EINVAL;
1247         }
1248         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1249                 dev_dbg_f(zd_usb_dev(usb),
1250                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1251                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1252                 return -EINVAL;
1253         }
1254 #ifdef DEBUG
1255         if (value & (~0UL << bits)) {
1256                 dev_dbg_f(zd_usb_dev(usb),
1257                         "error: value %#09x has bits >= %d set\n",
1258                         value, bits);
1259                 return -EINVAL;
1260         }
1261 #endif /* DEBUG */
1262
1263         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1264
1265         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1266         if (r) {
1267                 dev_dbg_f(zd_usb_dev(usb),
1268                         "error %d: Couldn't read CR203\n", r);
1269                 goto out;
1270         }
1271         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1272
1273         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1274         req = kmalloc(req_len, GFP_NOFS);
1275         if (!req)
1276                 return -ENOMEM;
1277
1278         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1279         /* 1: 3683a, but not used in ZYDAS driver */
1280         req->value = cpu_to_le16(2);
1281         req->bits = cpu_to_le16(bits);
1282
1283         for (i = 0; i < bits; i++) {
1284                 u16 bv = bit_value_template;
1285                 if (value & (1 << (bits-1-i)))
1286                         bv |= RF_DATA;
1287                 req->bit_values[i] = cpu_to_le16(bv);
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 out;
1297         }
1298         if (req_len != actual_req_len) {
1299                 dev_dbg_f(zd_usb_dev(usb), "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 out;
1304         }
1305
1306         /* FALL-THROUGH with r == 0 */
1307 out:
1308         kfree(req);
1309         return r;
1310 }