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         { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
  43         /* ZD1211B */
  44         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  45         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  46         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  47         {}
  48 };
  49
  50 MODULE_LICENSE("GPL");
  51 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
  52 MODULE_AUTHOR("Ulrich Kunitz");
  53 MODULE_AUTHOR("Daniel Drake");
  54 MODULE_VERSION("1.0");
  55 MODULE_DEVICE_TABLE(usb, usb_ids);
  56
  57 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
  58 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
  59
  60 /* register address handling */
  61
  62 #ifdef DEBUG
  63 static int check_addr(struct zd_usb *usb, zd_addr_t addr)
  64 {
  65         u32 base = ZD_ADDR_BASE(addr);
  66         u32 offset = ZD_OFFSET(addr);
  67
  68         if ((u32)addr & ADDR_ZERO_MASK)
  69                 goto invalid_address;
  70         switch (base) {
  71         case USB_BASE:
  72                 break;
  73         case CR_BASE:
  74                 if (offset > CR_MAX_OFFSET) {
  75                         dev_dbg(zd_usb_dev(usb),
  76                                 "CR offset %#010x larger than"
  77                                 " CR_MAX_OFFSET %#10x\n",
  78                                 offset, CR_MAX_OFFSET);
  79                         goto invalid_address;
  80                 }
  81                 if (offset & 1) {
  82                         dev_dbg(zd_usb_dev(usb),
  83                                 "CR offset %#010x is not a multiple of 2\n",
  84                                 offset);
  85                         goto invalid_address;
  86                 }
  87                 break;
  88         case E2P_BASE:
  89                 if (offset > E2P_MAX_OFFSET) {
  90                         dev_dbg(zd_usb_dev(usb),
  91                                 "E2P offset %#010x larger than"
  92                                 " E2P_MAX_OFFSET %#010x\n",
  93                                 offset, E2P_MAX_OFFSET);
  94                         goto invalid_address;
  95                 }
  96                 break;
  97         case FW_BASE:
  98                 if (!usb->fw_base_offset) {
  99                         dev_dbg(zd_usb_dev(usb),
 100                                "ERROR: fw base offset has not been set\n");
 101                         return -EAGAIN;
 102                 }
 103                 if (offset > FW_MAX_OFFSET) {
 104                         dev_dbg(zd_usb_dev(usb),
 105                                 "FW offset %#10x is larger than"
 106                                 " FW_MAX_OFFSET %#010x\n",
 107                                 offset, FW_MAX_OFFSET);
 108                         goto invalid_address;
 109                 }
 110                 break;
 111         default:
 112                 dev_dbg(zd_usb_dev(usb),
 113                         "address has unsupported base %#010x\n", addr);
 114                 goto invalid_address;
 115         }
 116
 117         return 0;
 118 invalid_address:
 119         dev_dbg(zd_usb_dev(usb),
 120                 "ERROR: invalid address: %#010x\n", addr);
 121         return -EINVAL;
 122 }
 123 #endif /* DEBUG */
 124
 125 static u16 usb_addr(struct zd_usb *usb, zd_addr_t addr)
 126 {
 127         u32 base;
 128         u16 offset;
 129
 130         base = ZD_ADDR_BASE(addr);
 131         offset = ZD_OFFSET(addr);
 132
 133         ZD_ASSERT(check_addr(usb, addr) == 0);
 134
 135         switch (base) {
 136         case CR_BASE:
 137                 offset += CR_BASE_OFFSET;
 138                 break;
 139         case E2P_BASE:
 140                 offset += E2P_BASE_OFFSET;
 141                 break;
 142         case FW_BASE:
 143                 offset += usb->fw_base_offset;
 144                 break;
 145         }
 146
 147         return offset;
 148 }
 149
 150 /* USB device initialization */
 151
 152 static int request_fw_file(
 153         const struct firmware **fw, const char *name, struct device *device)
 154 {
 155         int r;
 156
 157         dev_dbg_f(device, "fw name %s\n", name);
 158
 159         r = request_firmware(fw, name, device);
 160         if (r)
 161                 dev_err(device,
 162                        "Could not load firmware file %s. Error number %d\n",
 163                        name, r);
 164         return r;
 165 }
 166
 167 static inline u16 get_bcdDevice(const struct usb_device *udev)
 168 {
 169         return le16_to_cpu(udev->descriptor.bcdDevice);
 170 }
 171
 172 enum upload_code_flags {
 173         REBOOT = 1,
 174 };
 175
 176 /* Ensures that MAX_TRANSFER_SIZE is even. */
 177 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 178
 179 static int upload_code(struct usb_device *udev,
 180         const u8 *data, size_t size, u16 code_offset, int flags)
 181 {
 182         u8 *p;
 183         int r;
 184
 185         /* USB request blocks need "kmalloced" buffers.
 186          */
 187         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 188         if (!p) {
 189                 dev_err(&udev->dev, "out of memory\n");
 190                 r = -ENOMEM;
 191                 goto error;
 192         }
 193
 194         size &= ~1;
 195         while (size > 0) {
 196                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 197                         size : MAX_TRANSFER_SIZE;
 198
 199                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 200
 201                 memcpy(p, data, transfer_size);
 202                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 203                         USB_REQ_FIRMWARE_DOWNLOAD,
 204                         USB_DIR_OUT | USB_TYPE_VENDOR,
 205                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 206                 if (r < 0) {
 207                         dev_err(&udev->dev,
 208                                "USB control request for firmware upload"
 209                                " failed. Error number %d\n", r);
 210                         goto error;
 211                 }
 212                 transfer_size = r & ~1;
 213
 214                 size -= transfer_size;
 215                 data += transfer_size;
 216                 code_offset += transfer_size/sizeof(u16);
 217         }
 218
 219         if (flags & REBOOT) {
 220                 u8 ret;
 221
 222                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 223                         USB_REQ_FIRMWARE_CONFIRM,
 224                         USB_DIR_IN | USB_TYPE_VENDOR,
 225                         0, 0, &ret, sizeof(ret), 5000 /* ms */);
 226                 if (r != sizeof(ret)) {
 227                         dev_err(&udev->dev,
 228                                 "control request firmeware confirmation failed."
 229                                 " Return value %d\n", r);
 230                         if (r >= 0)
 231                                 r = -ENODEV;
 232                         goto error;
 233                 }
 234                 if (ret & 0x80) {
 235                         dev_err(&udev->dev,
 236                                 "Internal error while downloading."
 237                                 " Firmware confirm return value %#04x\n",
 238                                 (unsigned int)ret);
 239                         r = -ENODEV;
 240                         goto error;
 241                 }
 242                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 243                         (unsigned int)ret);
 244         }
 245
 246         r = 0;
 247 error:
 248         kfree(p);
 249         return r;
 250 }
 251
 252 static u16 get_word(const void *data, u16 offset)
 253 {
 254         const __le16 *p = data;
 255         return le16_to_cpu(p[offset]);
 256 }
 257
 258 static char *get_fw_name(char *buffer, size_t size, u8 device_type,
 259                        const char* postfix)
 260 {
 261         scnprintf(buffer, size, "%s%s",
 262                 device_type == DEVICE_ZD1211B ?
 263                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 264                 postfix);
 265         return buffer;
 266 }
 267
 268 static int upload_firmware(struct usb_device *udev, u8 device_type)
 269 {
 270         int r;
 271         u16 fw_bcdDevice;
 272         u16 bcdDevice;
 273         const struct firmware *ub_fw = NULL;
 274         const struct firmware *uph_fw = NULL;
 275         char fw_name[128];
 276
 277         bcdDevice = get_bcdDevice(udev);
 278
 279         r = request_fw_file(&ub_fw,
 280                 get_fw_name(fw_name, sizeof(fw_name), device_type,  "ub"),
 281                 &udev->dev);
 282         if (r)
 283                 goto error;
 284
 285         fw_bcdDevice = get_word(ub_fw->data, EEPROM_REGS_OFFSET);
 286
 287         /* FIXME: do we have any reason to perform the kludge that the vendor
 288          * driver does when there is a version mismatch? (their driver uploads
 289          * different firmwares and stuff)
 290          */
 291         if (fw_bcdDevice != bcdDevice) {
 292                 dev_info(&udev->dev,
 293                         "firmware device id %#06x and actual device id "
 294                         "%#06x differ, continuing anyway\n",
 295                         fw_bcdDevice, bcdDevice);
 296         } else {
 297                 dev_dbg_f(&udev->dev,
 298                         "firmware device id %#06x is equal to the "
 299                         "actual device id\n", fw_bcdDevice);
 300         }
 301
 302
 303         r = request_fw_file(&uph_fw,
 304                 get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"),
 305                 &udev->dev);
 306         if (r)
 307                 goto error;
 308
 309         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START_OFFSET,
 310                         REBOOT);
 311         if (r) {
 312                 dev_err(&udev->dev,
 313                         "Could not upload firmware code uph. Error number %d\n",
 314                         r);
 315         }
 316
 317         /* FALL-THROUGH */
 318 error:
 319         release_firmware(ub_fw);
 320         release_firmware(uph_fw);
 321         return r;
 322 }
 323
 324 static void disable_read_regs_int(struct zd_usb *usb)
 325 {
 326         struct zd_usb_interrupt *intr = &usb->intr;
 327
 328         spin_lock(&intr->lock);
 329         intr->read_regs_enabled = 0;
 330         spin_unlock(&intr->lock);
 331 }
 332
 333 #define urb_dev(urb) (&(urb)->dev->dev)
 334
 335 static inline void handle_regs_int(struct urb *urb)
 336 {
 337         struct zd_usb *usb = urb->context;
 338         struct zd_usb_interrupt *intr = &usb->intr;
 339         int len;
 340
 341         ZD_ASSERT(in_interrupt());
 342         spin_lock(&intr->lock);
 343
 344         if (intr->read_regs_enabled) {
 345                 intr->read_regs.length = len = urb->actual_length;
 346
 347                 if (len > sizeof(intr->read_regs.buffer))
 348                         len = sizeof(intr->read_regs.buffer);
 349                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 350                 intr->read_regs_enabled = 0;
 351                 complete(&intr->read_regs.completion);
 352                 goto out;
 353         }
 354
 355         dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
 356 out:
 357         spin_unlock(&intr->lock);
 358 }
 359
 360 static inline void handle_retry_failed_int(struct urb *urb)
 361 {
 362         dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
 363 }
 364
 365
 366 static void int_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
 367 {
 368         int r;
 369         struct usb_int_header *hdr;
 370
 371         switch (urb->status) {
 372         case 0:
 373                 break;
 374         case -ESHUTDOWN:
 375         case -EINVAL:
 376         case -ENODEV:
 377         case -ENOENT:
 378         case -ECONNRESET:
 379         case -EPIPE:
 380                 goto kfree;
 381         default:
 382                 goto resubmit;
 383         }
 384
 385         if (urb->actual_length < sizeof(hdr)) {
 386                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 387                 goto resubmit;
 388         }
 389
 390         hdr = urb->transfer_buffer;
 391         if (hdr->type != USB_INT_TYPE) {
 392                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 393                 goto resubmit;
 394         }
 395
 396         switch (hdr->id) {
 397         case USB_INT_ID_REGS:
 398                 handle_regs_int(urb);
 399                 break;
 400         case USB_INT_ID_RETRY_FAILED:
 401                 handle_retry_failed_int(urb);
 402                 break;
 403         default:
 404                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 405                         (unsigned int)hdr->id);
 406                 goto resubmit;
 407         }
 408
 409 resubmit:
 410         r = usb_submit_urb(urb, GFP_ATOMIC);
 411         if (r) {
 412                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
 413                 goto kfree;
 414         }
 415         return;
 416 kfree:
 417         kfree(urb->transfer_buffer);
 418 }
 419
 420 static inline int int_urb_interval(struct usb_device *udev)
 421 {
 422         switch (udev->speed) {
 423         case USB_SPEED_HIGH:
 424                 return 4;
 425         case USB_SPEED_LOW:
 426                 return 10;
 427         case USB_SPEED_FULL:
 428         default:
 429                 return 1;
 430         }
 431 }
 432
 433 static inline int usb_int_enabled(struct zd_usb *usb)
 434 {
 435         unsigned long flags;
 436         struct zd_usb_interrupt *intr = &usb->intr;
 437         struct urb *urb;
 438
 439         spin_lock_irqsave(&intr->lock, flags);
 440         urb = intr->urb;
 441         spin_unlock_irqrestore(&intr->lock, flags);
 442         return urb != NULL;
 443 }
 444
 445 int zd_usb_enable_int(struct zd_usb *usb)
 446 {
 447         int r;
 448         struct usb_device *udev;
 449         struct zd_usb_interrupt *intr = &usb->intr;
 450         void *transfer_buffer = NULL;
 451         struct urb *urb;
 452
 453         dev_dbg_f(zd_usb_dev(usb), "\n");
 454
 455         urb = usb_alloc_urb(0, GFP_NOFS);
 456         if (!urb) {
 457                 r = -ENOMEM;
 458                 goto out;
 459         }
 460
 461         ZD_ASSERT(!irqs_disabled());
 462         spin_lock_irq(&intr->lock);
 463         if (intr->urb) {
 464                 spin_unlock_irq(&intr->lock);
 465                 r = 0;
 466                 goto error_free_urb;
 467         }
 468         intr->urb = urb;
 469         spin_unlock_irq(&intr->lock);
 470
 471         /* TODO: make it a DMA buffer */
 472         r = -ENOMEM;
 473         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_NOFS);
 474         if (!transfer_buffer) {
 475                 dev_dbg_f(zd_usb_dev(usb),
 476                         "couldn't allocate transfer_buffer\n");
 477                 goto error_set_urb_null;
 478         }
 479
 480         udev = zd_usb_to_usbdev(usb);
 481         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 482                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
 483                          int_urb_complete, usb,
 484                          intr->interval);
 485
 486         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 487         r = usb_submit_urb(urb, GFP_NOFS);
 488         if (r) {
 489                 dev_dbg_f(zd_usb_dev(usb),
 490                          "Couldn't submit urb. Error number %d\n", r);
 491                 goto error;
 492         }
 493
 494         return 0;
 495 error:
 496         kfree(transfer_buffer);
 497 error_set_urb_null:
 498         spin_lock_irq(&intr->lock);
 499         intr->urb = NULL;
 500         spin_unlock_irq(&intr->lock);
 501 error_free_urb:
 502         usb_free_urb(urb);
 503 out:
 504         return r;
 505 }
 506
 507 void zd_usb_disable_int(struct zd_usb *usb)
 508 {
 509         unsigned long flags;
 510         struct zd_usb_interrupt *intr = &usb->intr;
 511         struct urb *urb;
 512
 513         spin_lock_irqsave(&intr->lock, flags);
 514         urb = intr->urb;
 515         if (!urb) {
 516                 spin_unlock_irqrestore(&intr->lock, flags);
 517                 return;
 518         }
 519         intr->urb = NULL;
 520         spin_unlock_irqrestore(&intr->lock, flags);
 521
 522         usb_kill_urb(urb);
 523         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 524         usb_free_urb(urb);
 525 }
 526
 527 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 528                              unsigned int length)
 529 {
 530         int i;
 531         struct zd_mac *mac = zd_usb_to_mac(usb);
 532         const struct rx_length_info *length_info;
 533
 534         if (length < sizeof(struct rx_length_info)) {
 535                 /* It's not a complete packet anyhow. */
 536                 return;
 537         }
 538         length_info = (struct rx_length_info *)
 539                 (buffer + length - sizeof(struct rx_length_info));
 540
 541         /* It might be that three frames are merged into a single URB
 542          * transaction. We have to check for the length info tag.
 543          *
 544          * While testing we discovered that length_info might be unaligned,
 545          * because if USB transactions are merged, the last packet will not
 546          * be padded. Unaligned access might also happen if the length_info
 547          * structure is not present.
 548          */
 549         if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
 550         {
 551                 unsigned int l, k, n;
 552                 for (i = 0, l = 0;; i++) {
 553                         k = le16_to_cpu(get_unaligned(&length_info->length[i]));
 554                         n = l+k;
 555                         if (n > length)
 556                                 return;
 557                         zd_mac_rx(mac, buffer+l, k);
 558                         if (i >= 2)
 559                                 return;
 560                         l = (n+3) & ~3;
 561                 }
 562         } else {
 563                 zd_mac_rx(mac, buffer, length);
 564         }
 565 }
 566
 567 static void rx_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
 568 {
 569         struct zd_usb *usb;
 570         struct zd_usb_rx *rx;
 571         const u8 *buffer;
 572         unsigned int length;
 573
 574         switch (urb->status) {
 575         case 0:
 576                 break;
 577         case -ESHUTDOWN:
 578         case -EINVAL:
 579         case -ENODEV:
 580         case -ENOENT:
 581         case -ECONNRESET:
 582         case -EPIPE:
 583                 return;
 584         default:
 585                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 586                 goto resubmit;
 587         }
 588
 589         buffer = urb->transfer_buffer;
 590         length = urb->actual_length;
 591         usb = urb->context;
 592         rx = &usb->rx;
 593
 594         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 595                 /* If there is an old first fragment, we don't care. */
 596                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 597                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 598                 spin_lock(&rx->lock);
 599                 memcpy(rx->fragment, buffer, length);
 600                 rx->fragment_length = length;
 601                 spin_unlock(&rx->lock);
 602                 goto resubmit;
 603         }
 604
 605         spin_lock(&rx->lock);
 606         if (rx->fragment_length > 0) {
 607                 /* We are on a second fragment, we believe */
 608                 ZD_ASSERT(length + rx->fragment_length <=
 609                           ARRAY_SIZE(rx->fragment));
 610                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 611                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 612                 handle_rx_packet(usb, rx->fragment,
 613                                  rx->fragment_length + length);
 614                 rx->fragment_length = 0;
 615                 spin_unlock(&rx->lock);
 616         } else {
 617                 spin_unlock(&rx->lock);
 618                 handle_rx_packet(usb, buffer, length);
 619         }
 620
 621 resubmit:
 622         usb_submit_urb(urb, GFP_ATOMIC);
 623 }
 624
 625 struct urb *alloc_urb(struct zd_usb *usb)
 626 {
 627         struct usb_device *udev = zd_usb_to_usbdev(usb);
 628         struct urb *urb;
 629         void *buffer;
 630
 631         urb = usb_alloc_urb(0, GFP_NOFS);
 632         if (!urb)
 633                 return NULL;
 634         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_NOFS,
 635                                   &urb->transfer_dma);
 636         if (!buffer) {
 637                 usb_free_urb(urb);
 638                 return NULL;
 639         }
 640
 641         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 642                           buffer, USB_MAX_RX_SIZE,
 643                           rx_urb_complete, usb);
 644         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 645
 646         return urb;
 647 }
 648
 649 void free_urb(struct urb *urb)
 650 {
 651         if (!urb)
 652                 return;
 653         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 654                         urb->transfer_buffer, urb->transfer_dma);
 655         usb_free_urb(urb);
 656 }
 657
 658 int zd_usb_enable_rx(struct zd_usb *usb)
 659 {
 660         int i, r;
 661         struct zd_usb_rx *rx = &usb->rx;
 662         struct urb **urbs;
 663
 664         dev_dbg_f(zd_usb_dev(usb), "\n");
 665
 666         r = -ENOMEM;
 667         urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_NOFS);
 668         if (!urbs)
 669                 goto error;
 670         for (i = 0; i < URBS_COUNT; i++) {
 671                 urbs[i] = alloc_urb(usb);
 672                 if (!urbs[i])
 673                         goto error;
 674         }
 675
 676         ZD_ASSERT(!irqs_disabled());
 677         spin_lock_irq(&rx->lock);
 678         if (rx->urbs) {
 679                 spin_unlock_irq(&rx->lock);
 680                 r = 0;
 681                 goto error;
 682         }
 683         rx->urbs = urbs;
 684         rx->urbs_count = URBS_COUNT;
 685         spin_unlock_irq(&rx->lock);
 686
 687         for (i = 0; i < URBS_COUNT; i++) {
 688                 r = usb_submit_urb(urbs[i], GFP_NOFS);
 689                 if (r)
 690                         goto error_submit;
 691         }
 692
 693         return 0;
 694 error_submit:
 695         for (i = 0; i < URBS_COUNT; i++) {
 696                 usb_kill_urb(urbs[i]);
 697         }
 698         spin_lock_irq(&rx->lock);
 699         rx->urbs = NULL;
 700         rx->urbs_count = 0;
 701         spin_unlock_irq(&rx->lock);
 702 error:
 703         if (urbs) {
 704                 for (i = 0; i < URBS_COUNT; i++)
 705                         free_urb(urbs[i]);
 706         }
 707         return r;
 708 }
 709
 710 void zd_usb_disable_rx(struct zd_usb *usb)
 711 {
 712         int i;
 713         unsigned long flags;
 714         struct urb **urbs;
 715         unsigned int count;
 716         struct zd_usb_rx *rx = &usb->rx;
 717
 718         spin_lock_irqsave(&rx->lock, flags);
 719         urbs = rx->urbs;
 720         count = rx->urbs_count;
 721         spin_unlock_irqrestore(&rx->lock, flags);
 722         if (!urbs)
 723                 return;
 724
 725         for (i = 0; i < count; i++) {
 726                 usb_kill_urb(urbs[i]);
 727                 free_urb(urbs[i]);
 728         }
 729         kfree(urbs);
 730
 731         spin_lock_irqsave(&rx->lock, flags);
 732         rx->urbs = NULL;
 733         rx->urbs_count = 0;
 734         spin_unlock_irqrestore(&rx->lock, flags);
 735 }
 736
 737 static void tx_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
 738 {
 739         int r;
 740
 741         switch (urb->status) {
 742         case 0:
 743                 break;
 744         case -ESHUTDOWN:
 745         case -EINVAL:
 746         case -ENODEV:
 747         case -ENOENT:
 748         case -ECONNRESET:
 749         case -EPIPE:
 750                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 751                 break;
 752         default:
 753                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 754                 goto resubmit;
 755         }
 756 free_urb:
 757         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 758                         urb->transfer_buffer, urb->transfer_dma);
 759         usb_free_urb(urb);
 760         return;
 761 resubmit:
 762         r = usb_submit_urb(urb, GFP_ATOMIC);
 763         if (r) {
 764                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 765                 goto free_urb;
 766         }
 767 }
 768
 769 /* Puts the frame on the USB endpoint. It doesn't wait for
 770  * completion. The frame must contain the control set.
 771  */
 772 int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
 773 {
 774         int r;
 775         struct usb_device *udev = zd_usb_to_usbdev(usb);
 776         struct urb *urb;
 777         void *buffer;
 778
 779         urb = usb_alloc_urb(0, GFP_ATOMIC);
 780         if (!urb) {
 781                 r = -ENOMEM;
 782                 goto out;
 783         }
 784
 785         buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
 786                                   &urb->transfer_dma);
 787         if (!buffer) {
 788                 r = -ENOMEM;
 789                 goto error_free_urb;
 790         }
 791         memcpy(buffer, frame, length);
 792
 793         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 794                           buffer, length, tx_urb_complete, NULL);
 795         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 796
 797         r = usb_submit_urb(urb, GFP_ATOMIC);
 798         if (r)
 799                 goto error;
 800         return 0;
 801 error:
 802         usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
 803                         urb->transfer_dma);
 804 error_free_urb:
 805         usb_free_urb(urb);
 806 out:
 807         return r;
 808 }
 809
 810 static inline void init_usb_interrupt(struct zd_usb *usb)
 811 {
 812         struct zd_usb_interrupt *intr = &usb->intr;
 813
 814         spin_lock_init(&intr->lock);
 815         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 816         init_completion(&intr->read_regs.completion);
 817         intr->read_regs.cr_int_addr = cpu_to_le16(usb_addr(usb, CR_INTERRUPT));
 818 }
 819
 820 static inline void init_usb_rx(struct zd_usb *usb)
 821 {
 822         struct zd_usb_rx *rx = &usb->rx;
 823         spin_lock_init(&rx->lock);
 824         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 825                 rx->usb_packet_size = 512;
 826         } else {
 827                 rx->usb_packet_size = 64;
 828         }
 829         ZD_ASSERT(rx->fragment_length == 0);
 830 }
 831
 832 static inline void init_usb_tx(struct zd_usb *usb)
 833 {
 834         /* FIXME: at this point we will allocate a fixed number of urb's for
 835          * use in a cyclic scheme */
 836 }
 837
 838 void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
 839                  struct usb_interface *intf)
 840 {
 841         memset(usb, 0, sizeof(*usb));
 842         usb->intf = usb_get_intf(intf);
 843         usb_set_intfdata(usb->intf, netdev);
 844         init_usb_interrupt(usb);
 845         init_usb_tx(usb);
 846         init_usb_rx(usb);
 847 }
 848
 849 int zd_usb_init_hw(struct zd_usb *usb)
 850 {
 851         int r;
 852         struct zd_chip *chip = zd_usb_to_chip(usb);
 853
 854         ZD_ASSERT(mutex_is_locked(&chip->mutex));
 855         r = zd_ioread16_locked(chip, &usb->fw_base_offset,
 856                         USB_REG((u16)FW_BASE_ADDR_OFFSET));
 857         if (r)
 858                 return r;
 859         dev_dbg_f(zd_usb_dev(usb), "fw_base_offset: %#06hx\n",
 860                  usb->fw_base_offset);
 861
 862         return 0;
 863 }
 864
 865 void zd_usb_clear(struct zd_usb *usb)
 866 {
 867         usb_set_intfdata(usb->intf, NULL);
 868         usb_put_intf(usb->intf);
 869         memset(usb, 0, sizeof(*usb));
 870         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
 871 }
 872
 873 static const char *speed(enum usb_device_speed speed)
 874 {
 875         switch (speed) {
 876         case USB_SPEED_LOW:
 877                 return "low";
 878         case USB_SPEED_FULL:
 879                 return "full";
 880         case USB_SPEED_HIGH:
 881                 return "high";
 882         default:
 883                 return "unknown speed";
 884         }
 885 }
 886
 887 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
 888 {
 889         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
 890                 le16_to_cpu(udev->descriptor.idVendor),
 891                 le16_to_cpu(udev->descriptor.idProduct),
 892                 get_bcdDevice(udev),
 893                 speed(udev->speed));
 894 }
 895
 896 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
 897 {
 898         struct usb_device *udev = interface_to_usbdev(usb->intf);
 899         return scnprint_id(udev, buffer, size);
 900 }
 901
 902 #ifdef DEBUG
 903 static void print_id(struct usb_device *udev)
 904 {
 905         char buffer[40];
 906
 907         scnprint_id(udev, buffer, sizeof(buffer));
 908         buffer[sizeof(buffer)-1] = 0;
 909         dev_dbg_f(&udev->dev, "%s\n", buffer);
 910 }
 911 #else
 912 #define print_id(udev) do { } while (0)
 913 #endif
 914
 915 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
 916 {
 917         int r;
 918         struct usb_device *udev = interface_to_usbdev(intf);
 919         struct net_device *netdev = NULL;
 920
 921         print_id(udev);
 922
 923         switch (udev->speed) {
 924         case USB_SPEED_LOW:
 925         case USB_SPEED_FULL:
 926         case USB_SPEED_HIGH:
 927                 break;
 928         default:
 929                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
 930                 r = -ENODEV;
 931                 goto error;
 932         }
 933
 934         netdev = zd_netdev_alloc(intf);
 935         if (netdev == NULL) {
 936                 r = -ENOMEM;
 937                 goto error;
 938         }
 939
 940         r = upload_firmware(udev, id->driver_info);
 941         if (r) {
 942                 dev_err(&intf->dev,
 943                        "couldn't load firmware. Error number %d\n", r);
 944                 goto error;
 945         }
 946
 947         r = usb_reset_configuration(udev);
 948         if (r) {
 949                 dev_dbg_f(&intf->dev,
 950                         "couldn't reset configuration. Error number %d\n", r);
 951                 goto error;
 952         }
 953
 954         /* At this point the interrupt endpoint is not generally enabled. We
 955          * save the USB bandwidth until the network device is opened. But
 956          * notify that the initialization of the MAC will require the
 957          * interrupts to be temporary enabled.
 958          */
 959         r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
 960         if (r) {
 961                 dev_dbg_f(&intf->dev,
 962                          "couldn't initialize mac. Error number %d\n", r);
 963                 goto error;
 964         }
 965
 966         r = register_netdev(netdev);
 967         if (r) {
 968                 dev_dbg_f(&intf->dev,
 969                          "couldn't register netdev. Error number %d\n", r);
 970                 goto error;
 971         }
 972
 973         dev_dbg_f(&intf->dev, "successful\n");
 974         dev_info(&intf->dev,"%s\n", netdev->name);
 975         return 0;
 976 error:
 977         usb_reset_device(interface_to_usbdev(intf));
 978         zd_netdev_free(netdev);
 979         return r;
 980 }
 981
 982 static void disconnect(struct usb_interface *intf)
 983 {
 984         struct net_device *netdev = zd_intf_to_netdev(intf);
 985         struct zd_mac *mac = zd_netdev_mac(netdev);
 986         struct zd_usb *usb = &mac->chip.usb;
 987
 988         dev_dbg_f(zd_usb_dev(usb), "\n");
 989
 990         zd_netdev_disconnect(netdev);
 991
 992         /* Just in case something has gone wrong! */
 993         zd_usb_disable_rx(usb);
 994         zd_usb_disable_int(usb);
 995
 996         /* If the disconnect has been caused by a removal of the
 997          * driver module, the reset allows reloading of the driver. If the
 998          * reset will not be executed here, the upload of the firmware in the
 999          * probe function caused by the reloading of the driver will fail.
1000          */
1001         usb_reset_device(interface_to_usbdev(intf));
1002
1003         /* If somebody still waits on this lock now, this is an error. */
1004         zd_netdev_free(netdev);
1005         dev_dbg(&intf->dev, "disconnected\n");
1006 }
1007
1008 static struct usb_driver driver = {
1009         .name           = "zd1211rw",
1010         .id_table       = usb_ids,
1011         .probe          = probe,
1012         .disconnect     = disconnect,
1013 };
1014
1015 static int __init usb_init(void)
1016 {
1017         int r;
1018
1019         pr_debug("usb_init()\n");
1020
1021         r = usb_register(&driver);
1022         if (r) {
1023                 printk(KERN_ERR "usb_register() failed. Error number %d\n", r);
1024                 return r;
1025         }
1026
1027         pr_debug("zd1211rw initialized\n");
1028         return 0;
1029 }
1030
1031 static void __exit usb_exit(void)
1032 {
1033         pr_debug("usb_exit()\n");
1034         usb_deregister(&driver);
1035 }
1036
1037 module_init(usb_init);
1038 module_exit(usb_exit);
1039
1040 static int usb_int_regs_length(unsigned int count)
1041 {
1042         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1043 }
1044
1045 static void prepare_read_regs_int(struct zd_usb *usb)
1046 {
1047         struct zd_usb_interrupt *intr = &usb->intr;
1048
1049         spin_lock(&intr->lock);
1050         intr->read_regs_enabled = 1;
1051         INIT_COMPLETION(intr->read_regs.completion);
1052         spin_unlock(&intr->lock);
1053 }
1054
1055 static int get_results(struct zd_usb *usb, u16 *values,
1056                        struct usb_req_read_regs *req, unsigned int count)
1057 {
1058         int r;
1059         int i;
1060         struct zd_usb_interrupt *intr = &usb->intr;
1061         struct read_regs_int *rr = &intr->read_regs;
1062         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1063
1064         spin_lock(&intr->lock);
1065
1066         r = -EIO;
1067         /* The created block size seems to be larger than expected.
1068          * However results appear to be correct.
1069          */
1070         if (rr->length < usb_int_regs_length(count)) {
1071                 dev_dbg_f(zd_usb_dev(usb),
1072                          "error: actual length %d less than expected %d\n",
1073                          rr->length, usb_int_regs_length(count));
1074                 goto error_unlock;
1075         }
1076         if (rr->length > sizeof(rr->buffer)) {
1077                 dev_dbg_f(zd_usb_dev(usb),
1078                          "error: actual length %d exceeds buffer size %zu\n",
1079                          rr->length, sizeof(rr->buffer));
1080                 goto error_unlock;
1081         }
1082
1083         for (i = 0; i < count; i++) {
1084                 struct reg_data *rd = &regs->regs[i];
1085                 if (rd->addr != req->addr[i]) {
1086                         dev_dbg_f(zd_usb_dev(usb),
1087                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1088                                  le16_to_cpu(rd->addr),
1089                                  le16_to_cpu(req->addr[i]));
1090                         goto error_unlock;
1091                 }
1092                 values[i] = le16_to_cpu(rd->value);
1093         }
1094
1095         r = 0;
1096 error_unlock:
1097         spin_unlock(&intr->lock);
1098         return r;
1099 }
1100
1101 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1102                      const zd_addr_t *addresses, unsigned int count)
1103 {
1104         int r;
1105         int i, req_len, actual_req_len;
1106         struct usb_device *udev;
1107         struct usb_req_read_regs *req = NULL;
1108         unsigned long timeout;
1109
1110         if (count < 1) {
1111                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1112                 return -EINVAL;
1113         }
1114         if (count > USB_MAX_IOREAD16_COUNT) {
1115                 dev_dbg_f(zd_usb_dev(usb),
1116                          "error: count %u exceeds possible max %u\n",
1117                          count, USB_MAX_IOREAD16_COUNT);
1118                 return -EINVAL;
1119         }
1120         if (in_atomic()) {
1121                 dev_dbg_f(zd_usb_dev(usb),
1122                          "error: io in atomic context not supported\n");
1123                 return -EWOULDBLOCK;
1124         }
1125         if (!usb_int_enabled(usb)) {
1126                  dev_dbg_f(zd_usb_dev(usb),
1127                           "error: usb interrupt not enabled\n");
1128                 return -EWOULDBLOCK;
1129         }
1130
1131         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1132         req = kmalloc(req_len, GFP_NOFS);
1133         if (!req)
1134                 return -ENOMEM;
1135         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1136         for (i = 0; i < count; i++)
1137                 req->addr[i] = cpu_to_le16(usb_addr(usb, addresses[i]));
1138
1139         udev = zd_usb_to_usbdev(usb);
1140         prepare_read_regs_int(usb);
1141         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1142                          req, req_len, &actual_req_len, 1000 /* ms */);
1143         if (r) {
1144                 dev_dbg_f(zd_usb_dev(usb),
1145                         "error in usb_bulk_msg(). Error number %d\n", r);
1146                 goto error;
1147         }
1148         if (req_len != actual_req_len) {
1149                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1150                         " req_len %d != actual_req_len %d\n",
1151                         req_len, actual_req_len);
1152                 r = -EIO;
1153                 goto error;
1154         }
1155
1156         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1157                                               msecs_to_jiffies(1000));
1158         if (!timeout) {
1159                 disable_read_regs_int(usb);
1160                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1161                 r = -ETIMEDOUT;
1162                 goto error;
1163         }
1164
1165         r = get_results(usb, values, req, count);
1166 error:
1167         kfree(req);
1168         return r;
1169 }
1170
1171 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1172                       unsigned int count)
1173 {
1174         int r;
1175         struct usb_device *udev;
1176         struct usb_req_write_regs *req = NULL;
1177         int i, req_len, actual_req_len;
1178
1179         if (count == 0)
1180                 return 0;
1181         if (count > USB_MAX_IOWRITE16_COUNT) {
1182                 dev_dbg_f(zd_usb_dev(usb),
1183                         "error: count %u exceeds possible max %u\n",
1184                         count, USB_MAX_IOWRITE16_COUNT);
1185                 return -EINVAL;
1186         }
1187         if (in_atomic()) {
1188                 dev_dbg_f(zd_usb_dev(usb),
1189                         "error: io in atomic context not supported\n");
1190                 return -EWOULDBLOCK;
1191         }
1192
1193         req_len = sizeof(struct usb_req_write_regs) +
1194                   count * sizeof(struct reg_data);
1195         req = kmalloc(req_len, GFP_NOFS);
1196         if (!req)
1197                 return -ENOMEM;
1198
1199         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1200         for (i = 0; i < count; i++) {
1201                 struct reg_data *rw  = &req->reg_writes[i];
1202                 rw->addr = cpu_to_le16(usb_addr(usb, ioreqs[i].addr));
1203                 rw->value = cpu_to_le16(ioreqs[i].value);
1204         }
1205
1206         udev = zd_usb_to_usbdev(usb);
1207         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1208                          req, req_len, &actual_req_len, 1000 /* ms */);
1209         if (r) {
1210                 dev_dbg_f(zd_usb_dev(usb),
1211                         "error in usb_bulk_msg(). Error number %d\n", r);
1212                 goto error;
1213         }
1214         if (req_len != actual_req_len) {
1215                 dev_dbg_f(zd_usb_dev(usb),
1216                         "error in usb_bulk_msg()"
1217                         " req_len %d != actual_req_len %d\n",
1218                         req_len, actual_req_len);
1219                 r = -EIO;
1220                 goto error;
1221         }
1222
1223         /* FALL-THROUGH with r == 0 */
1224 error:
1225         kfree(req);
1226         return r;
1227 }
1228
1229 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1230 {
1231         int r;
1232         struct usb_device *udev;
1233         struct usb_req_rfwrite *req = NULL;
1234         int i, req_len, actual_req_len;
1235         u16 bit_value_template;
1236
1237         if (in_atomic()) {
1238                 dev_dbg_f(zd_usb_dev(usb),
1239                         "error: io in atomic context not supported\n");
1240                 return -EWOULDBLOCK;
1241         }
1242         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1243                 dev_dbg_f(zd_usb_dev(usb),
1244                         "error: bits %d are smaller than"
1245                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1246                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1247                 return -EINVAL;
1248         }
1249         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1250                 dev_dbg_f(zd_usb_dev(usb),
1251                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1252                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1253                 return -EINVAL;
1254         }
1255 #ifdef DEBUG
1256         if (value & (~0UL << bits)) {
1257                 dev_dbg_f(zd_usb_dev(usb),
1258                         "error: value %#09x has bits >= %d set\n",
1259                         value, bits);
1260                 return -EINVAL;
1261         }
1262 #endif /* DEBUG */
1263
1264         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1265
1266         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1267         if (r) {
1268                 dev_dbg_f(zd_usb_dev(usb),
1269                         "error %d: Couldn't read CR203\n", r);
1270                 goto out;
1271         }
1272         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1273
1274         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1275         req = kmalloc(req_len, GFP_NOFS);
1276         if (!req)
1277                 return -ENOMEM;
1278
1279         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1280         /* 1: 3683a, but not used in ZYDAS driver */
1281         req->value = cpu_to_le16(2);
1282         req->bits = cpu_to_le16(bits);
1283
1284         for (i = 0; i < bits; i++) {
1285                 u16 bv = bit_value_template;
1286                 if (value & (1 << (bits-1-i)))
1287                         bv |= RF_DATA;
1288                 req->bit_values[i] = cpu_to_le16(bv);
1289         }
1290
1291         udev = zd_usb_to_usbdev(usb);
1292         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1293                          req, req_len, &actual_req_len, 1000 /* ms */);
1294         if (r) {
1295                 dev_dbg_f(zd_usb_dev(usb),
1296                         "error in usb_bulk_msg(). Error number %d\n", r);
1297                 goto out;
1298         }
1299         if (req_len != actual_req_len) {
1300                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1301                         " req_len %d != actual_req_len %d\n",
1302                         req_len, actual_req_len);
1303                 r = -EIO;
1304                 goto out;
1305         }
1306
1307         /* FALL-THROUGH with r == 0 */
1308 out:
1309         kfree(req);
1310         return r;
1311 }