err.no Git - linux-2.6/blob - 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         { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
  44         { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
  45         /* ZD1211B */
  46         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  47         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  48         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  49         {}
  50 };
  51
  52 MODULE_LICENSE("GPL");
  53 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
  54 MODULE_AUTHOR("Ulrich Kunitz");
  55 MODULE_AUTHOR("Daniel Drake");
  56 MODULE_VERSION("1.0");
  57 MODULE_DEVICE_TABLE(usb, usb_ids);
  58
  59 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
  60 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
  61
  62 /* register address handling */
  63
  64 #ifdef DEBUG
  65 static int check_addr(struct zd_usb *usb, zd_addr_t addr)
  66 {
  67         u32 base = ZD_ADDR_BASE(addr);
  68         u32 offset = ZD_OFFSET(addr);
  69
  70         if ((u32)addr & ADDR_ZERO_MASK)
  71                 goto invalid_address;
  72         switch (base) {
  73         case USB_BASE:
  74                 break;
  75         case CR_BASE:
  76                 if (offset > CR_MAX_OFFSET) {
  77                         dev_dbg(zd_usb_dev(usb),
  78                                 "CR offset %#010x larger than"
  79                                 " CR_MAX_OFFSET %#10x\n",
  80                                 offset, CR_MAX_OFFSET);
  81                         goto invalid_address;
  82                 }
  83                 if (offset & 1) {
  84                         dev_dbg(zd_usb_dev(usb),
  85                                 "CR offset %#010x is not a multiple of 2\n",
  86                                 offset);
  87                         goto invalid_address;
  88                 }
  89                 break;
  90         case E2P_BASE:
  91                 if (offset > E2P_MAX_OFFSET) {
  92                         dev_dbg(zd_usb_dev(usb),
  93                                 "E2P offset %#010x larger than"
  94                                 " E2P_MAX_OFFSET %#010x\n",
  95                                 offset, E2P_MAX_OFFSET);
  96                         goto invalid_address;
  97                 }
  98                 break;
  99         case FW_BASE:
 100                 if (!usb->fw_base_offset) {
 101                         dev_dbg(zd_usb_dev(usb),
 102                                "ERROR: fw base offset has not been set\n");
 103                         return -EAGAIN;
 104                 }
 105                 if (offset > FW_MAX_OFFSET) {
 106                         dev_dbg(zd_usb_dev(usb),
 107                                 "FW offset %#10x is larger than"
 108                                 " FW_MAX_OFFSET %#010x\n",
 109                                 offset, FW_MAX_OFFSET);
 110                         goto invalid_address;
 111                 }
 112                 break;
 113         default:
 114                 dev_dbg(zd_usb_dev(usb),
 115                         "address has unsupported base %#010x\n", addr);
 116                 goto invalid_address;
 117         }
 118
 119         return 0;
 120 invalid_address:
 121         dev_dbg(zd_usb_dev(usb),
 122                 "ERROR: invalid address: %#010x\n", addr);
 123         return -EINVAL;
 124 }
 125 #endif /* DEBUG */
 126
 127 static u16 usb_addr(struct zd_usb *usb, zd_addr_t addr)
 128 {
 129         u32 base;
 130         u16 offset;
 131
 132         base = ZD_ADDR_BASE(addr);
 133         offset = ZD_OFFSET(addr);
 134
 135         ZD_ASSERT(check_addr(usb, addr) == 0);
 136
 137         switch (base) {
 138         case CR_BASE:
 139                 offset += CR_BASE_OFFSET;
 140                 break;
 141         case E2P_BASE:
 142                 offset += E2P_BASE_OFFSET;
 143                 break;
 144         case FW_BASE:
 145                 offset += usb->fw_base_offset;
 146                 break;
 147         }
 148
 149         return offset;
 150 }
 151
 152 /* USB device initialization */
 153
 154 static int request_fw_file(
 155         const struct firmware **fw, const char *name, struct device *device)
 156 {
 157         int r;
 158
 159         dev_dbg_f(device, "fw name %s\n", name);
 160
 161         r = request_firmware(fw, name, device);
 162         if (r)
 163                 dev_err(device,
 164                        "Could not load firmware file %s. Error number %d\n",
 165                        name, r);
 166         return r;
 167 }
 168
 169 static inline u16 get_bcdDevice(const struct usb_device *udev)
 170 {
 171         return le16_to_cpu(udev->descriptor.bcdDevice);
 172 }
 173
 174 enum upload_code_flags {
 175         REBOOT = 1,
 176 };
 177
 178 /* Ensures that MAX_TRANSFER_SIZE is even. */
 179 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 180
 181 static int upload_code(struct usb_device *udev,
 182         const u8 *data, size_t size, u16 code_offset, int flags)
 183 {
 184         u8 *p;
 185         int r;
 186
 187         /* USB request blocks need "kmalloced" buffers.
 188          */
 189         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 190         if (!p) {
 191                 dev_err(&udev->dev, "out of memory\n");
 192                 r = -ENOMEM;
 193                 goto error;
 194         }
 195
 196         size &= ~1;
 197         while (size > 0) {
 198                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 199                         size : MAX_TRANSFER_SIZE;
 200
 201                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 202
 203                 memcpy(p, data, transfer_size);
 204                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 205                         USB_REQ_FIRMWARE_DOWNLOAD,
 206                         USB_DIR_OUT | USB_TYPE_VENDOR,
 207                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 208                 if (r < 0) {
 209                         dev_err(&udev->dev,
 210                                "USB control request for firmware upload"
 211                                " failed. Error number %d\n", r);
 212                         goto error;
 213                 }
 214                 transfer_size = r & ~1;
 215
 216                 size -= transfer_size;
 217                 data += transfer_size;
 218                 code_offset += transfer_size/sizeof(u16);
 219         }
 220
 221         if (flags & REBOOT) {
 222                 u8 ret;
 223
 224                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 225                         USB_REQ_FIRMWARE_CONFIRM,
 226                         USB_DIR_IN | USB_TYPE_VENDOR,
 227                         0, 0, &ret, sizeof(ret), 5000 /* ms */);
 228                 if (r != sizeof(ret)) {
 229                         dev_err(&udev->dev,
 230                                 "control request firmeware confirmation failed."
 231                                 " Return value %d\n", r);
 232                         if (r >= 0)
 233                                 r = -ENODEV;
 234                         goto error;
 235                 }
 236                 if (ret & 0x80) {
 237                         dev_err(&udev->dev,
 238                                 "Internal error while downloading."
 239                                 " Firmware confirm return value %#04x\n",
 240                                 (unsigned int)ret);
 241                         r = -ENODEV;
 242                         goto error;
 243                 }
 244                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 245                         (unsigned int)ret);
 246         }
 247
 248         r = 0;
 249 error:
 250         kfree(p);
 251         return r;
 252 }
 253
 254 static u16 get_word(const void *data, u16 offset)
 255 {
 256         const __le16 *p = data;
 257         return le16_to_cpu(p[offset]);
 258 }
 259
 260 static char *get_fw_name(char *buffer, size_t size, u8 device_type,
 261                        const char* postfix)
 262 {
 263         scnprintf(buffer, size, "%s%s",
 264                 device_type == DEVICE_ZD1211B ?
 265                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 266                 postfix);
 267         return buffer;
 268 }
 269
 270 static int upload_firmware(struct usb_device *udev, u8 device_type)
 271 {
 272         int r;
 273         u16 fw_bcdDevice;
 274         u16 bcdDevice;
 275         const struct firmware *ub_fw = NULL;
 276         const struct firmware *uph_fw = NULL;
 277         char fw_name[128];
 278
 279         bcdDevice = get_bcdDevice(udev);
 280
 281         r = request_fw_file(&ub_fw,
 282                 get_fw_name(fw_name, sizeof(fw_name), device_type,  "ub"),
 283                 &udev->dev);
 284         if (r)
 285                 goto error;
 286
 287         fw_bcdDevice = get_word(ub_fw->data, EEPROM_REGS_OFFSET);
 288
 289         /* FIXME: do we have any reason to perform the kludge that the vendor
 290          * driver does when there is a version mismatch? (their driver uploads
 291          * different firmwares and stuff)
 292          */
 293         if (fw_bcdDevice != bcdDevice) {
 294                 dev_info(&udev->dev,
 295                         "firmware device id %#06x and actual device id "
 296                         "%#06x differ, continuing anyway\n",
 297                         fw_bcdDevice, bcdDevice);
 298         } else {
 299                 dev_dbg_f(&udev->dev,
 300                         "firmware device id %#06x is equal to the "
 301                         "actual device id\n", fw_bcdDevice);
 302         }
 303
 304
 305         r = request_fw_file(&uph_fw,
 306                 get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"),
 307                 &udev->dev);
 308         if (r)
 309                 goto error;
 310
 311         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START_OFFSET,
 312                         REBOOT);
 313         if (r) {
 314                 dev_err(&udev->dev,
 315                         "Could not upload firmware code uph. Error number %d\n",
 316                         r);
 317         }
 318
 319         /* FALL-THROUGH */
 320 error:
 321         release_firmware(ub_fw);
 322         release_firmware(uph_fw);
 323         return r;
 324 }
 325
 326 static void disable_read_regs_int(struct zd_usb *usb)
 327 {
 328         struct zd_usb_interrupt *intr = &usb->intr;
 329
 330         spin_lock(&intr->lock);
 331         intr->read_regs_enabled = 0;
 332         spin_unlock(&intr->lock);
 333 }
 334
 335 #define urb_dev(urb) (&(urb)->dev->dev)
 336
 337 static inline void handle_regs_int(struct urb *urb)
 338 {
 339         struct zd_usb *usb = urb->context;
 340         struct zd_usb_interrupt *intr = &usb->intr;
 341         int len;
 342
 343         ZD_ASSERT(in_interrupt());
 344         spin_lock(&intr->lock);
 345
 346         if (intr->read_regs_enabled) {
 347                 intr->read_regs.length = len = urb->actual_length;
 348
 349                 if (len > sizeof(intr->read_regs.buffer))
 350                         len = sizeof(intr->read_regs.buffer);
 351                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 352                 intr->read_regs_enabled = 0;
 353                 complete(&intr->read_regs.completion);
 354                 goto out;
 355         }
 356
 357         dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
 358 out:
 359         spin_unlock(&intr->lock);
 360 }
 361
 362 static inline void handle_retry_failed_int(struct urb *urb)
 363 {
 364         dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
 365 }
 366
 367
 368 static void int_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
 369 {
 370         int r;
 371         struct usb_int_header *hdr;
 372
 373         switch (urb->status) {
 374         case 0:
 375                 break;
 376         case -ESHUTDOWN:
 377         case -EINVAL:
 378         case -ENODEV:
 379         case -ENOENT:
 380         case -ECONNRESET:
 381         case -EPIPE:
 382                 goto kfree;
 383         default:
 384                 goto resubmit;
 385         }
 386
 387         if (urb->actual_length < sizeof(hdr)) {
 388                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 389                 goto resubmit;
 390         }
 391
 392         hdr = urb->transfer_buffer;
 393         if (hdr->type != USB_INT_TYPE) {
 394                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 395                 goto resubmit;
 396         }
 397
 398         switch (hdr->id) {
 399         case USB_INT_ID_REGS:
 400                 handle_regs_int(urb);
 401                 break;
 402         case USB_INT_ID_RETRY_FAILED:
 403                 handle_retry_failed_int(urb);
 404                 break;
 405         default:
 406                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 407                         (unsigned int)hdr->id);
 408                 goto resubmit;
 409         }
 410
 411 resubmit:
 412         r = usb_submit_urb(urb, GFP_ATOMIC);
 413         if (r) {
 414                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
 415                 goto kfree;
 416         }
 417         return;
 418 kfree:
 419         kfree(urb->transfer_buffer);
 420 }
 421
 422 static inline int int_urb_interval(struct usb_device *udev)
 423 {
 424         switch (udev->speed) {
 425         case USB_SPEED_HIGH:
 426                 return 4;
 427         case USB_SPEED_LOW:
 428                 return 10;
 429         case USB_SPEED_FULL:
 430         default:
 431                 return 1;
 432         }
 433 }
 434
 435 static inline int usb_int_enabled(struct zd_usb *usb)
 436 {
 437         unsigned long flags;
 438         struct zd_usb_interrupt *intr = &usb->intr;
 439         struct urb *urb;
 440
 441         spin_lock_irqsave(&intr->lock, flags);
 442         urb = intr->urb;
 443         spin_unlock_irqrestore(&intr->lock, flags);
 444         return urb != NULL;
 445 }
 446
 447 int zd_usb_enable_int(struct zd_usb *usb)
 448 {
 449         int r;
 450         struct usb_device *udev;
 451         struct zd_usb_interrupt *intr = &usb->intr;
 452         void *transfer_buffer = NULL;
 453         struct urb *urb;
 454
 455         dev_dbg_f(zd_usb_dev(usb), "\n");
 456
 457         urb = usb_alloc_urb(0, GFP_NOFS);
 458         if (!urb) {
 459                 r = -ENOMEM;
 460                 goto out;
 461         }
 462
 463         ZD_ASSERT(!irqs_disabled());
 464         spin_lock_irq(&intr->lock);
 465         if (intr->urb) {
 466                 spin_unlock_irq(&intr->lock);
 467                 r = 0;
 468                 goto error_free_urb;
 469         }
 470         intr->urb = urb;
 471         spin_unlock_irq(&intr->lock);
 472
 473         /* TODO: make it a DMA buffer */
 474         r = -ENOMEM;
 475         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_NOFS);
 476         if (!transfer_buffer) {
 477                 dev_dbg_f(zd_usb_dev(usb),
 478                         "couldn't allocate transfer_buffer\n");
 479                 goto error_set_urb_null;
 480         }
 481
 482         udev = zd_usb_to_usbdev(usb);
 483         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 484                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
 485                          int_urb_complete, usb,
 486                          intr->interval);
 487
 488         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 489         r = usb_submit_urb(urb, GFP_NOFS);
 490         if (r) {
 491                 dev_dbg_f(zd_usb_dev(usb),
 492                          "Couldn't submit urb. Error number %d\n", r);
 493                 goto error;
 494         }
 495
 496         return 0;
 497 error:
 498         kfree(transfer_buffer);
 499 error_set_urb_null:
 500         spin_lock_irq(&intr->lock);
 501         intr->urb = NULL;
 502         spin_unlock_irq(&intr->lock);
 503 error_free_urb:
 504         usb_free_urb(urb);
 505 out:
 506         return r;
 507 }
 508
 509 void zd_usb_disable_int(struct zd_usb *usb)
 510 {
 511         unsigned long flags;
 512         struct zd_usb_interrupt *intr = &usb->intr;
 513         struct urb *urb;
 514
 515         spin_lock_irqsave(&intr->lock, flags);
 516         urb = intr->urb;
 517         if (!urb) {
 518                 spin_unlock_irqrestore(&intr->lock, flags);
 519                 return;
 520         }
 521         intr->urb = NULL;
 522         spin_unlock_irqrestore(&intr->lock, flags);
 523
 524         usb_kill_urb(urb);
 525         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 526         usb_free_urb(urb);
 527 }
 528
 529 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 530                              unsigned int length)
 531 {
 532         int i;
 533         struct zd_mac *mac = zd_usb_to_mac(usb);
 534         const struct rx_length_info *length_info;
 535
 536         if (length < sizeof(struct rx_length_info)) {
 537                 /* It's not a complete packet anyhow. */
 538                 return;
 539         }
 540         length_info = (struct rx_length_info *)
 541                 (buffer + length - sizeof(struct rx_length_info));
 542
 543         /* It might be that three frames are merged into a single URB
 544          * transaction. We have to check for the length info tag.
 545          *
 546          * While testing we discovered that length_info might be unaligned,
 547          * because if USB transactions are merged, the last packet will not
 548          * be padded. Unaligned access might also happen if the length_info
 549          * structure is not present.
 550          */
 551         if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
 552         {
 553                 unsigned int l, k, n;
 554                 for (i = 0, l = 0;; i++) {
 555                         k = le16_to_cpu(get_unaligned(&length_info->length[i]));
 556                         n = l+k;
 557                         if (n > length)
 558                                 return;
 559                         zd_mac_rx(mac, buffer+l, k);
 560                         if (i >= 2)
 561                                 return;
 562                         l = (n+3) & ~3;
 563                 }
 564         } else {
 565                 zd_mac_rx(mac, buffer, length);
 566         }
 567 }
 568
 569 static void rx_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
 570 {
 571         struct zd_usb *usb;
 572         struct zd_usb_rx *rx;
 573         const u8 *buffer;
 574         unsigned int length;
 575
 576         switch (urb->status) {
 577         case 0:
 578                 break;
 579         case -ESHUTDOWN:
 580         case -EINVAL:
 581         case -ENODEV:
 582         case -ENOENT:
 583         case -ECONNRESET:
 584         case -EPIPE:
 585                 return;
 586         default:
 587                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 588                 goto resubmit;
 589         }
 590
 591         buffer = urb->transfer_buffer;
 592         length = urb->actual_length;
 593         usb = urb->context;
 594         rx = &usb->rx;
 595
 596         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 597                 /* If there is an old first fragment, we don't care. */
 598                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 599                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 600                 spin_lock(&rx->lock);
 601                 memcpy(rx->fragment, buffer, length);
 602                 rx->fragment_length = length;
 603                 spin_unlock(&rx->lock);
 604                 goto resubmit;
 605         }
 606
 607         spin_lock(&rx->lock);
 608         if (rx->fragment_length > 0) {
 609                 /* We are on a second fragment, we believe */
 610                 ZD_ASSERT(length + rx->fragment_length <=
 611                           ARRAY_SIZE(rx->fragment));
 612                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 613                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 614                 handle_rx_packet(usb, rx->fragment,
 615                                  rx->fragment_length + length);
 616                 rx->fragment_length = 0;
 617                 spin_unlock(&rx->lock);
 618         } else {
 619                 spin_unlock(&rx->lock);
 620                 handle_rx_packet(usb, buffer, length);
 621         }
 622
 623 resubmit:
 624         usb_submit_urb(urb, GFP_ATOMIC);
 625 }
 626
 627 struct urb *alloc_urb(struct zd_usb *usb)
 628 {
 629         struct usb_device *udev = zd_usb_to_usbdev(usb);
 630         struct urb *urb;
 631         void *buffer;
 632
 633         urb = usb_alloc_urb(0, GFP_NOFS);
 634         if (!urb)
 635                 return NULL;
 636         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_NOFS,
 637                                   &urb->transfer_dma);
 638         if (!buffer) {
 639                 usb_free_urb(urb);
 640                 return NULL;
 641         }
 642
 643         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 644                           buffer, USB_MAX_RX_SIZE,
 645                           rx_urb_complete, usb);
 646         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 647
 648         return urb;
 649 }
 650
 651 void free_urb(struct urb *urb)
 652 {
 653         if (!urb)
 654                 return;
 655         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 656                         urb->transfer_buffer, urb->transfer_dma);
 657         usb_free_urb(urb);
 658 }
 659
 660 int zd_usb_enable_rx(struct zd_usb *usb)
 661 {
 662         int i, r;
 663         struct zd_usb_rx *rx = &usb->rx;
 664         struct urb **urbs;
 665
 666         dev_dbg_f(zd_usb_dev(usb), "\n");
 667
 668         r = -ENOMEM;
 669         urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_NOFS);
 670         if (!urbs)
 671                 goto error;
 672         for (i = 0; i < URBS_COUNT; i++) {
 673                 urbs[i] = alloc_urb(usb);
 674                 if (!urbs[i])
 675                         goto error;
 676         }
 677
 678         ZD_ASSERT(!irqs_disabled());
 679         spin_lock_irq(&rx->lock);
 680         if (rx->urbs) {
 681                 spin_unlock_irq(&rx->lock);
 682                 r = 0;
 683                 goto error;
 684         }
 685         rx->urbs = urbs;
 686         rx->urbs_count = URBS_COUNT;
 687         spin_unlock_irq(&rx->lock);
 688
 689         for (i = 0; i < URBS_COUNT; i++) {
 690                 r = usb_submit_urb(urbs[i], GFP_NOFS);
 691                 if (r)
 692                         goto error_submit;
 693         }
 694
 695         return 0;
 696 error_submit:
 697         for (i = 0; i < URBS_COUNT; i++) {
 698                 usb_kill_urb(urbs[i]);
 699         }
 700         spin_lock_irq(&rx->lock);
 701         rx->urbs = NULL;
 702         rx->urbs_count = 0;
 703         spin_unlock_irq(&rx->lock);
 704 error:
 705         if (urbs) {
 706                 for (i = 0; i < URBS_COUNT; i++)
 707                         free_urb(urbs[i]);
 708         }
 709         return r;
 710 }
 711
 712 void zd_usb_disable_rx(struct zd_usb *usb)
 713 {
 714         int i;
 715         unsigned long flags;
 716         struct urb **urbs;
 717         unsigned int count;
 718         struct zd_usb_rx *rx = &usb->rx;
 719
 720         spin_lock_irqsave(&rx->lock, flags);
 721         urbs = rx->urbs;
 722         count = rx->urbs_count;
 723         spin_unlock_irqrestore(&rx->lock, flags);
 724         if (!urbs)
 725                 return;
 726
 727         for (i = 0; i < count; i++) {
 728                 usb_kill_urb(urbs[i]);
 729                 free_urb(urbs[i]);
 730         }
 731         kfree(urbs);
 732
 733         spin_lock_irqsave(&rx->lock, flags);
 734         rx->urbs = NULL;
 735         rx->urbs_count = 0;
 736         spin_unlock_irqrestore(&rx->lock, flags);
 737 }
 738
 739 static void tx_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
 740 {
 741         int r;
 742
 743         switch (urb->status) {
 744         case 0:
 745                 break;
 746         case -ESHUTDOWN:
 747         case -EINVAL:
 748         case -ENODEV:
 749         case -ENOENT:
 750         case -ECONNRESET:
 751         case -EPIPE:
 752                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 753                 break;
 754         default:
 755                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 756                 goto resubmit;
 757         }
 758 free_urb:
 759         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 760                         urb->transfer_buffer, urb->transfer_dma);
 761         usb_free_urb(urb);
 762         return;
 763 resubmit:
 764         r = usb_submit_urb(urb, GFP_ATOMIC);
 765         if (r) {
 766                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 767                 goto free_urb;
 768         }
 769 }
 770
 771 /* Puts the frame on the USB endpoint. It doesn't wait for
 772  * completion. The frame must contain the control set.
 773  */
 774 int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
 775 {
 776         int r;
 777         struct usb_device *udev = zd_usb_to_usbdev(usb);
 778         struct urb *urb;
 779         void *buffer;
 780
 781         urb = usb_alloc_urb(0, GFP_ATOMIC);
 782         if (!urb) {
 783                 r = -ENOMEM;
 784                 goto out;
 785         }
 786
 787         buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
 788                                   &urb->transfer_dma);
 789         if (!buffer) {
 790                 r = -ENOMEM;
 791                 goto error_free_urb;
 792         }
 793         memcpy(buffer, frame, length);
 794
 795         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 796                           buffer, length, tx_urb_complete, NULL);
 797         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 798
 799         r = usb_submit_urb(urb, GFP_ATOMIC);
 800         if (r)
 801                 goto error;
 802         return 0;
 803 error:
 804         usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
 805                         urb->transfer_dma);
 806 error_free_urb:
 807         usb_free_urb(urb);
 808 out:
 809         return r;
 810 }
 811
 812 static inline void init_usb_interrupt(struct zd_usb *usb)
 813 {
 814         struct zd_usb_interrupt *intr = &usb->intr;
 815
 816         spin_lock_init(&intr->lock);
 817         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 818         init_completion(&intr->read_regs.completion);
 819         intr->read_regs.cr_int_addr = cpu_to_le16(usb_addr(usb, CR_INTERRUPT));
 820 }
 821
 822 static inline void init_usb_rx(struct zd_usb *usb)
 823 {
 824         struct zd_usb_rx *rx = &usb->rx;
 825         spin_lock_init(&rx->lock);
 826         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 827                 rx->usb_packet_size = 512;
 828         } else {
 829                 rx->usb_packet_size = 64;
 830         }
 831         ZD_ASSERT(rx->fragment_length == 0);
 832 }
 833
 834 static inline void init_usb_tx(struct zd_usb *usb)
 835 {
 836         /* FIXME: at this point we will allocate a fixed number of urb's for
 837          * use in a cyclic scheme */
 838 }
 839
 840 void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
 841                  struct usb_interface *intf)
 842 {
 843         memset(usb, 0, sizeof(*usb));
 844         usb->intf = usb_get_intf(intf);
 845         usb_set_intfdata(usb->intf, netdev);
 846         init_usb_interrupt(usb);
 847         init_usb_tx(usb);
 848         init_usb_rx(usb);
 849 }
 850
 851 int zd_usb_init_hw(struct zd_usb *usb)
 852 {
 853         int r;
 854         struct zd_chip *chip = zd_usb_to_chip(usb);
 855
 856         ZD_ASSERT(mutex_is_locked(&chip->mutex));
 857         r = zd_ioread16_locked(chip, &usb->fw_base_offset,
 858                         USB_REG((u16)FW_BASE_ADDR_OFFSET));
 859         if (r)
 860                 return r;
 861         dev_dbg_f(zd_usb_dev(usb), "fw_base_offset: %#06hx\n",
 862                  usb->fw_base_offset);
 863
 864         return 0;
 865 }
 866
 867 void zd_usb_clear(struct zd_usb *usb)
 868 {
 869         usb_set_intfdata(usb->intf, NULL);
 870         usb_put_intf(usb->intf);
 871         memset(usb, 0, sizeof(*usb));
 872         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
 873 }
 874
 875 static const char *speed(enum usb_device_speed speed)
 876 {
 877         switch (speed) {
 878         case USB_SPEED_LOW:
 879                 return "low";
 880         case USB_SPEED_FULL:
 881                 return "full";
 882         case USB_SPEED_HIGH:
 883                 return "high";
 884         default:
 885                 return "unknown speed";
 886         }
 887 }
 888
 889 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
 890 {
 891         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
 892                 le16_to_cpu(udev->descriptor.idVendor),
 893                 le16_to_cpu(udev->descriptor.idProduct),
 894                 get_bcdDevice(udev),
 895                 speed(udev->speed));
 896 }
 897
 898 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
 899 {
 900         struct usb_device *udev = interface_to_usbdev(usb->intf);
 901         return scnprint_id(udev, buffer, size);
 902 }
 903
 904 #ifdef DEBUG
 905 static void print_id(struct usb_device *udev)
 906 {
 907         char buffer[40];
 908
 909         scnprint_id(udev, buffer, sizeof(buffer));
 910         buffer[sizeof(buffer)-1] = 0;
 911         dev_dbg_f(&udev->dev, "%s\n", buffer);
 912 }
 913 #else
 914 #define print_id(udev) do { } while (0)
 915 #endif
 916
 917 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
 918 {
 919         int r;
 920         struct usb_device *udev = interface_to_usbdev(intf);
 921         struct net_device *netdev = NULL;
 922
 923         print_id(udev);
 924
 925         switch (udev->speed) {
 926         case USB_SPEED_LOW:
 927         case USB_SPEED_FULL:
 928         case USB_SPEED_HIGH:
 929                 break;
 930         default:
 931                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
 932                 r = -ENODEV;
 933                 goto error;
 934         }
 935
 936         netdev = zd_netdev_alloc(intf);
 937         if (netdev == NULL) {
 938                 r = -ENOMEM;
 939                 goto error;
 940         }
 941
 942         r = upload_firmware(udev, id->driver_info);
 943         if (r) {
 944                 dev_err(&intf->dev,
 945                        "couldn't load firmware. Error number %d\n", r);
 946                 goto error;
 947         }
 948
 949         r = usb_reset_configuration(udev);
 950         if (r) {
 951                 dev_dbg_f(&intf->dev,
 952                         "couldn't reset configuration. Error number %d\n", r);
 953                 goto error;
 954         }
 955
 956         /* At this point the interrupt endpoint is not generally enabled. We
 957          * save the USB bandwidth until the network device is opened. But
 958          * notify that the initialization of the MAC will require the
 959          * interrupts to be temporary enabled.
 960          */
 961         r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
 962         if (r) {
 963                 dev_dbg_f(&intf->dev,
 964                          "couldn't initialize mac. Error number %d\n", r);
 965                 goto error;
 966         }
 967
 968         r = register_netdev(netdev);
 969         if (r) {
 970                 dev_dbg_f(&intf->dev,
 971                          "couldn't register netdev. Error number %d\n", r);
 972                 goto error;
 973         }
 974
 975         dev_dbg_f(&intf->dev, "successful\n");
 976         dev_info(&intf->dev,"%s\n", netdev->name);
 977         return 0;
 978 error:
 979         usb_reset_device(interface_to_usbdev(intf));
 980         zd_netdev_free(netdev);
 981         return r;
 982 }
 983
 984 static void disconnect(struct usb_interface *intf)
 985 {
 986         struct net_device *netdev = zd_intf_to_netdev(intf);
 987         struct zd_mac *mac = zd_netdev_mac(netdev);
 988         struct zd_usb *usb = &mac->chip.usb;
 989
 990         dev_dbg_f(zd_usb_dev(usb), "\n");
 991
 992         zd_netdev_disconnect(netdev);
 993
 994         /* Just in case something has gone wrong! */
 995         zd_usb_disable_rx(usb);
 996         zd_usb_disable_int(usb);
 997
 998         /* If the disconnect has been caused by a removal of the
 999          * driver module, the reset allows reloading of the driver. If the
1000          * reset will not be executed here, the upload of the firmware in the
1001          * probe function caused by the reloading of the driver will fail.
1002          */
1003         usb_reset_device(interface_to_usbdev(intf));
1004
1005         /* If somebody still waits on this lock now, this is an error. */
1006         zd_netdev_free(netdev);
1007         dev_dbg(&intf->dev, "disconnected\n");
1008 }
1009
1010 static struct usb_driver driver = {
1011         .name           = "zd1211rw",
1012         .id_table       = usb_ids,
1013         .probe          = probe,
1014         .disconnect     = disconnect,
1015 };
1016
1017 static int __init usb_init(void)
1018 {
1019         int r;
1020
1021         pr_debug("usb_init()\n");
1022
1023         r = usb_register(&driver);
1024         if (r) {
1025                 printk(KERN_ERR "usb_register() failed. Error number %d\n", r);
1026                 return r;
1027         }
1028
1029         pr_debug("zd1211rw initialized\n");
1030         return 0;
1031 }
1032
1033 static void __exit usb_exit(void)
1034 {
1035         pr_debug("usb_exit()\n");
1036         usb_deregister(&driver);
1037 }
1038
1039 module_init(usb_init);
1040 module_exit(usb_exit);
1041
1042 static int usb_int_regs_length(unsigned int count)
1043 {
1044         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1045 }
1046
1047 static void prepare_read_regs_int(struct zd_usb *usb)
1048 {
1049         struct zd_usb_interrupt *intr = &usb->intr;
1050
1051         spin_lock(&intr->lock);
1052         intr->read_regs_enabled = 1;
1053         INIT_COMPLETION(intr->read_regs.completion);
1054         spin_unlock(&intr->lock);
1055 }
1056
1057 static int get_results(struct zd_usb *usb, u16 *values,
1058                        struct usb_req_read_regs *req, unsigned int count)
1059 {
1060         int r;
1061         int i;
1062         struct zd_usb_interrupt *intr = &usb->intr;
1063         struct read_regs_int *rr = &intr->read_regs;
1064         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1065
1066         spin_lock(&intr->lock);
1067
1068         r = -EIO;
1069         /* The created block size seems to be larger than expected.
1070          * However results appear to be correct.
1071          */
1072         if (rr->length < usb_int_regs_length(count)) {
1073                 dev_dbg_f(zd_usb_dev(usb),
1074                          "error: actual length %d less than expected %d\n",
1075                          rr->length, usb_int_regs_length(count));
1076                 goto error_unlock;
1077         }
1078         if (rr->length > sizeof(rr->buffer)) {
1079                 dev_dbg_f(zd_usb_dev(usb),
1080                          "error: actual length %d exceeds buffer size %zu\n",
1081                          rr->length, sizeof(rr->buffer));
1082                 goto error_unlock;
1083         }
1084
1085         for (i = 0; i < count; i++) {
1086                 struct reg_data *rd = &regs->regs[i];
1087                 if (rd->addr != req->addr[i]) {
1088                         dev_dbg_f(zd_usb_dev(usb),
1089                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1090                                  le16_to_cpu(rd->addr),
1091                                  le16_to_cpu(req->addr[i]));
1092                         goto error_unlock;
1093                 }
1094                 values[i] = le16_to_cpu(rd->value);
1095         }
1096
1097         r = 0;
1098 error_unlock:
1099         spin_unlock(&intr->lock);
1100         return r;
1101 }
1102
1103 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1104                      const zd_addr_t *addresses, unsigned int count)
1105 {
1106         int r;
1107         int i, req_len, actual_req_len;
1108         struct usb_device *udev;
1109         struct usb_req_read_regs *req = NULL;
1110         unsigned long timeout;
1111
1112         if (count < 1) {
1113                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1114                 return -EINVAL;
1115         }
1116         if (count > USB_MAX_IOREAD16_COUNT) {
1117                 dev_dbg_f(zd_usb_dev(usb),
1118                          "error: count %u exceeds possible max %u\n",
1119                          count, USB_MAX_IOREAD16_COUNT);
1120                 return -EINVAL;
1121         }
1122         if (in_atomic()) {
1123                 dev_dbg_f(zd_usb_dev(usb),
1124                          "error: io in atomic context not supported\n");
1125                 return -EWOULDBLOCK;
1126         }
1127         if (!usb_int_enabled(usb)) {
1128                  dev_dbg_f(zd_usb_dev(usb),
1129                           "error: usb interrupt not enabled\n");
1130                 return -EWOULDBLOCK;
1131         }
1132
1133         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1134         req = kmalloc(req_len, GFP_NOFS);
1135         if (!req)
1136                 return -ENOMEM;
1137         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1138         for (i = 0; i < count; i++)
1139                 req->addr[i] = cpu_to_le16(usb_addr(usb, addresses[i]));
1140
1141         udev = zd_usb_to_usbdev(usb);
1142         prepare_read_regs_int(usb);
1143         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1144                          req, req_len, &actual_req_len, 1000 /* ms */);
1145         if (r) {
1146                 dev_dbg_f(zd_usb_dev(usb),
1147                         "error in usb_bulk_msg(). Error number %d\n", r);
1148                 goto error;
1149         }
1150         if (req_len != actual_req_len) {
1151                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1152                         " req_len %d != actual_req_len %d\n",
1153                         req_len, actual_req_len);
1154                 r = -EIO;
1155                 goto error;
1156         }
1157
1158         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1159                                               msecs_to_jiffies(1000));
1160         if (!timeout) {
1161                 disable_read_regs_int(usb);
1162                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1163                 r = -ETIMEDOUT;
1164                 goto error;
1165         }
1166
1167         r = get_results(usb, values, req, count);
1168 error:
1169         kfree(req);
1170         return r;
1171 }
1172
1173 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1174                       unsigned int count)
1175 {
1176         int r;
1177         struct usb_device *udev;
1178         struct usb_req_write_regs *req = NULL;
1179         int i, req_len, actual_req_len;
1180
1181         if (count == 0)
1182                 return 0;
1183         if (count > USB_MAX_IOWRITE16_COUNT) {
1184                 dev_dbg_f(zd_usb_dev(usb),
1185                         "error: count %u exceeds possible max %u\n",
1186                         count, USB_MAX_IOWRITE16_COUNT);
1187                 return -EINVAL;
1188         }
1189         if (in_atomic()) {
1190                 dev_dbg_f(zd_usb_dev(usb),
1191                         "error: io in atomic context not supported\n");
1192                 return -EWOULDBLOCK;
1193         }
1194
1195         req_len = sizeof(struct usb_req_write_regs) +
1196                   count * sizeof(struct reg_data);
1197         req = kmalloc(req_len, GFP_NOFS);
1198         if (!req)
1199                 return -ENOMEM;
1200
1201         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1202         for (i = 0; i < count; i++) {
1203                 struct reg_data *rw  = &req->reg_writes[i];
1204                 rw->addr = cpu_to_le16(usb_addr(usb, ioreqs[i].addr));
1205                 rw->value = cpu_to_le16(ioreqs[i].value);
1206         }
1207
1208         udev = zd_usb_to_usbdev(usb);
1209         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1210                          req, req_len, &actual_req_len, 1000 /* ms */);
1211         if (r) {
1212                 dev_dbg_f(zd_usb_dev(usb),
1213                         "error in usb_bulk_msg(). Error number %d\n", r);
1214                 goto error;
1215         }
1216         if (req_len != actual_req_len) {
1217                 dev_dbg_f(zd_usb_dev(usb),
1218                         "error in usb_bulk_msg()"
1219                         " req_len %d != actual_req_len %d\n",
1220                         req_len, actual_req_len);
1221                 r = -EIO;
1222                 goto error;
1223         }
1224
1225         /* FALL-THROUGH with r == 0 */
1226 error:
1227         kfree(req);
1228         return r;
1229 }
1230
1231 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1232 {
1233         int r;
1234         struct usb_device *udev;
1235         struct usb_req_rfwrite *req = NULL;
1236         int i, req_len, actual_req_len;
1237         u16 bit_value_template;
1238
1239         if (in_atomic()) {
1240                 dev_dbg_f(zd_usb_dev(usb),
1241                         "error: io in atomic context not supported\n");
1242                 return -EWOULDBLOCK;
1243         }
1244         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1245                 dev_dbg_f(zd_usb_dev(usb),
1246                         "error: bits %d are smaller than"
1247                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1248                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1249                 return -EINVAL;
1250         }
1251         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1252                 dev_dbg_f(zd_usb_dev(usb),
1253                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1254                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1255                 return -EINVAL;
1256         }
1257 #ifdef DEBUG
1258         if (value & (~0UL << bits)) {
1259                 dev_dbg_f(zd_usb_dev(usb),
1260                         "error: value %#09x has bits >= %d set\n",
1261                         value, bits);
1262                 return -EINVAL;
1263         }
1264 #endif /* DEBUG */
1265
1266         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1267
1268         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1269         if (r) {
1270                 dev_dbg_f(zd_usb_dev(usb),
1271                         "error %d: Couldn't read CR203\n", r);
1272                 goto out;
1273         }
1274         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1275
1276         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1277         req = kmalloc(req_len, GFP_NOFS);
1278         if (!req)
1279                 return -ENOMEM;
1280
1281         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1282         /* 1: 3683a, but not used in ZYDAS driver */
1283         req->value = cpu_to_le16(2);
1284         req->bits = cpu_to_le16(bits);
1285
1286         for (i = 0; i < bits; i++) {
1287                 u16 bv = bit_value_template;
1288                 if (value & (1 << (bits-1-i)))
1289                         bv |= RF_DATA;
1290                 req->bit_values[i] = cpu_to_le16(bv);
1291         }
1292
1293         udev = zd_usb_to_usbdev(usb);
1294         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1295                          req, req_len, &actual_req_len, 1000 /* ms */);
1296         if (r) {
1297                 dev_dbg_f(zd_usb_dev(usb),
1298                         "error in usb_bulk_msg(). Error number %d\n", r);
1299                 goto out;
1300         }
1301         if (req_len != actual_req_len) {
1302                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1303                         " req_len %d != actual_req_len %d\n",
1304                         req_len, actual_req_len);
1305                 r = -EIO;
1306                 goto out;
1307         }
1308
1309         /* FALL-THROUGH with r == 0 */
1310 out:
1311         kfree(req);
1312         return r;
1313 }