drivers/net/wireless/zd1211rw/zd_usb.c

   1 /* ZD1211 USB-WLAN driver for Linux
   2  *
   3  * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
   4  * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
   5  * Copyright (C) 2006-2007 Michael Wu <flamingice@sourmilk.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/init.h>
  24 #include <linux/firmware.h>
  25 #include <linux/device.h>
  26 #include <linux/errno.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/usb.h>
  29 #include <linux/workqueue.h>
  30 #include <net/mac80211.h>
  31 #include <asm/unaligned.h>
  32
  33 #include "zd_def.h"
  34 #include "zd_mac.h"
  35 #include "zd_usb.h"
  36
  37 static struct usb_device_id usb_ids[] = {
  38         /* ZD1211 */
  39         { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
  40         { USB_DEVICE(0x0ace, 0xa211), .driver_info = DEVICE_ZD1211 },
  41         { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
  42         { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
  43         { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
  44         { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
  45         { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
  46         { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
  47         { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
  48         { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
  49         { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
  50         { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
  51         { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
  52         { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
  53         { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
  54         { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
  55         { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
  56         { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
  57         { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
  58         { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
  59         { USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 },
  60         { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 },
  61         { USB_DEVICE(0x0105, 0x145f), .driver_info = DEVICE_ZD1211 },
  62         /* ZD1211B */
  63         { USB_DEVICE(0x054c, 0x0257), .driver_info = DEVICE_ZD1211B },
  64         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  65         { USB_DEVICE(0x0ace, 0xb215), .driver_info = DEVICE_ZD1211B },
  66         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  67         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  68         { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
  69         { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
  70         { USB_DEVICE(0x083a, 0xe503), .driver_info = DEVICE_ZD1211B },
  71         { USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B },
  72         { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
  73         { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
  74         { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
  75         { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
  76         { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
  77         { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
  78         { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
  79         { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
  80         { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
  81         { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
  82         { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
  83         { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
  84         { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
  85         { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
  86         { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
  87         { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
  88         { USB_DEVICE(0x07fa, 0x1196), .driver_info = DEVICE_ZD1211B },
  89         { USB_DEVICE(0x0df6, 0x0036), .driver_info = DEVICE_ZD1211B },
  90         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211B },
  91         /* "Driverless" devices that need ejecting */
  92         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
  93         { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
  94         {}
  95 };
  96
  97 MODULE_LICENSE("GPL");
  98 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
  99 MODULE_AUTHOR("Ulrich Kunitz");
 100 MODULE_AUTHOR("Daniel Drake");
 101 MODULE_VERSION("1.0");
 102 MODULE_DEVICE_TABLE(usb, usb_ids);
 103
 104 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
 105 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
 106
 107 /* USB device initialization */
 108 static void int_urb_complete(struct urb *urb);
 109
 110 static int request_fw_file(
 111         const struct firmware **fw, const char *name, struct device *device)
 112 {
 113         int r;
 114
 115         dev_dbg_f(device, "fw name %s\n", name);
 116
 117         r = request_firmware(fw, name, device);
 118         if (r)
 119                 dev_err(device,
 120                        "Could not load firmware file %s. Error number %d\n",
 121                        name, r);
 122         return r;
 123 }
 124
 125 static inline u16 get_bcdDevice(const struct usb_device *udev)
 126 {
 127         return le16_to_cpu(udev->descriptor.bcdDevice);
 128 }
 129
 130 enum upload_code_flags {
 131         REBOOT = 1,
 132 };
 133
 134 /* Ensures that MAX_TRANSFER_SIZE is even. */
 135 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 136
 137 static int upload_code(struct usb_device *udev,
 138         const u8 *data, size_t size, u16 code_offset, int flags)
 139 {
 140         u8 *p;
 141         int r;
 142
 143         /* USB request blocks need "kmalloced" buffers.
 144          */
 145         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 146         if (!p) {
 147                 dev_err(&udev->dev, "out of memory\n");
 148                 r = -ENOMEM;
 149                 goto error;
 150         }
 151
 152         size &= ~1;
 153         while (size > 0) {
 154                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 155                         size : MAX_TRANSFER_SIZE;
 156
 157                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 158
 159                 memcpy(p, data, transfer_size);
 160                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 161                         USB_REQ_FIRMWARE_DOWNLOAD,
 162                         USB_DIR_OUT | USB_TYPE_VENDOR,
 163                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 164                 if (r < 0) {
 165                         dev_err(&udev->dev,
 166                                "USB control request for firmware upload"
 167                                " failed. Error number %d\n", r);
 168                         goto error;
 169                 }
 170                 transfer_size = r & ~1;
 171
 172                 size -= transfer_size;
 173                 data += transfer_size;
 174                 code_offset += transfer_size/sizeof(u16);
 175         }
 176
 177         if (flags & REBOOT) {
 178                 u8 ret;
 179
 180                 /* Use "DMA-aware" buffer. */
 181                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 182                         USB_REQ_FIRMWARE_CONFIRM,
 183                         USB_DIR_IN | USB_TYPE_VENDOR,
 184                         0, 0, p, sizeof(ret), 5000 /* ms */);
 185                 if (r != sizeof(ret)) {
 186                         dev_err(&udev->dev,
 187                                 "control request firmeware confirmation failed."
 188                                 " Return value %d\n", r);
 189                         if (r >= 0)
 190                                 r = -ENODEV;
 191                         goto error;
 192                 }
 193                 ret = p[0];
 194                 if (ret & 0x80) {
 195                         dev_err(&udev->dev,
 196                                 "Internal error while downloading."
 197                                 " Firmware confirm return value %#04x\n",
 198                                 (unsigned int)ret);
 199                         r = -ENODEV;
 200                         goto error;
 201                 }
 202                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 203                         (unsigned int)ret);
 204         }
 205
 206         r = 0;
 207 error:
 208         kfree(p);
 209         return r;
 210 }
 211
 212 static u16 get_word(const void *data, u16 offset)
 213 {
 214         const __le16 *p = data;
 215         return le16_to_cpu(p[offset]);
 216 }
 217
 218 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
 219                        const char* postfix)
 220 {
 221         scnprintf(buffer, size, "%s%s",
 222                 usb->is_zd1211b ?
 223                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 224                 postfix);
 225         return buffer;
 226 }
 227
 228 static int handle_version_mismatch(struct zd_usb *usb,
 229         const struct firmware *ub_fw)
 230 {
 231         struct usb_device *udev = zd_usb_to_usbdev(usb);
 232         const struct firmware *ur_fw = NULL;
 233         int offset;
 234         int r = 0;
 235         char fw_name[128];
 236
 237         r = request_fw_file(&ur_fw,
 238                 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
 239                 &udev->dev);
 240         if (r)
 241                 goto error;
 242
 243         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
 244         if (r)
 245                 goto error;
 246
 247         offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
 248         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
 249                 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
 250
 251         /* At this point, the vendor driver downloads the whole firmware
 252          * image, hacks around with version IDs, and uploads it again,
 253          * completely overwriting the boot code. We do not do this here as
 254          * it is not required on any tested devices, and it is suspected to
 255          * cause problems. */
 256 error:
 257         release_firmware(ur_fw);
 258         return r;
 259 }
 260
 261 static int upload_firmware(struct zd_usb *usb)
 262 {
 263         int r;
 264         u16 fw_bcdDevice;
 265         u16 bcdDevice;
 266         struct usb_device *udev = zd_usb_to_usbdev(usb);
 267         const struct firmware *ub_fw = NULL;
 268         const struct firmware *uph_fw = NULL;
 269         char fw_name[128];
 270
 271         bcdDevice = get_bcdDevice(udev);
 272
 273         r = request_fw_file(&ub_fw,
 274                 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
 275                 &udev->dev);
 276         if (r)
 277                 goto error;
 278
 279         fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
 280
 281         if (fw_bcdDevice != bcdDevice) {
 282                 dev_info(&udev->dev,
 283                         "firmware version %#06x and device bootcode version "
 284                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
 285                 if (bcdDevice <= 0x4313)
 286                         dev_warn(&udev->dev, "device has old bootcode, please "
 287                                 "report success or failure\n");
 288
 289                 r = handle_version_mismatch(usb, ub_fw);
 290                 if (r)
 291                         goto error;
 292         } else {
 293                 dev_dbg_f(&udev->dev,
 294                         "firmware device id %#06x is equal to the "
 295                         "actual device id\n", fw_bcdDevice);
 296         }
 297
 298
 299         r = request_fw_file(&uph_fw,
 300                 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
 301                 &udev->dev);
 302         if (r)
 303                 goto error;
 304
 305         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
 306         if (r) {
 307                 dev_err(&udev->dev,
 308                         "Could not upload firmware code uph. Error number %d\n",
 309                         r);
 310         }
 311
 312         /* FALL-THROUGH */
 313 error:
 314         release_firmware(ub_fw);
 315         release_firmware(uph_fw);
 316         return r;
 317 }
 318
 319 /* Read data from device address space using "firmware interface" which does
 320  * not require firmware to be loaded. */
 321 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
 322 {
 323         int r;
 324         struct usb_device *udev = zd_usb_to_usbdev(usb);
 325         u8 *buf;
 326
 327         /* Use "DMA-aware" buffer. */
 328         buf = kmalloc(len, GFP_KERNEL);
 329         if (!buf)
 330                 return -ENOMEM;
 331         r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 332                 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
 333                 buf, len, 5000);
 334         if (r < 0) {
 335                 dev_err(&udev->dev,
 336                         "read over firmware interface failed: %d\n", r);
 337                 goto exit;
 338         } else if (r != len) {
 339                 dev_err(&udev->dev,
 340                         "incomplete read over firmware interface: %d/%d\n",
 341                         r, len);
 342                 r = -EIO;
 343                 goto exit;
 344         }
 345         r = 0;
 346         memcpy(data, buf, len);
 347 exit:
 348         kfree(buf);
 349         return r;
 350 }
 351
 352 #define urb_dev(urb) (&(urb)->dev->dev)
 353
 354 static inline void handle_regs_int(struct urb *urb)
 355 {
 356         struct zd_usb *usb = urb->context;
 357         struct zd_usb_interrupt *intr = &usb->intr;
 358         int len;
 359         u16 int_num;
 360
 361         ZD_ASSERT(in_interrupt());
 362         spin_lock(&intr->lock);
 363
 364         int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));
 365         if (int_num == CR_INTERRUPT) {
 366                 struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
 367                 memcpy(&mac->intr_buffer, urb->transfer_buffer,
 368                                 USB_MAX_EP_INT_BUFFER);
 369                 schedule_work(&mac->process_intr);
 370         } else if (intr->read_regs_enabled) {
 371                 intr->read_regs.length = len = urb->actual_length;
 372
 373                 if (len > sizeof(intr->read_regs.buffer))
 374                         len = sizeof(intr->read_regs.buffer);
 375                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 376                 intr->read_regs_enabled = 0;
 377                 complete(&intr->read_regs.completion);
 378                 goto out;
 379         }
 380
 381 out:
 382         spin_unlock(&intr->lock);
 383 }
 384
 385 static void int_urb_complete(struct urb *urb)
 386 {
 387         int r;
 388         struct usb_int_header *hdr;
 389
 390         switch (urb->status) {
 391         case 0:
 392                 break;
 393         case -ESHUTDOWN:
 394         case -EINVAL:
 395         case -ENODEV:
 396         case -ENOENT:
 397         case -ECONNRESET:
 398         case -EPIPE:
 399                 goto kfree;
 400         default:
 401                 goto resubmit;
 402         }
 403
 404         if (urb->actual_length < sizeof(hdr)) {
 405                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 406                 goto resubmit;
 407         }
 408
 409         hdr = urb->transfer_buffer;
 410         if (hdr->type != USB_INT_TYPE) {
 411                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 412                 goto resubmit;
 413         }
 414
 415         switch (hdr->id) {
 416         case USB_INT_ID_REGS:
 417                 handle_regs_int(urb);
 418                 break;
 419         case USB_INT_ID_RETRY_FAILED:
 420                 zd_mac_tx_failed(zd_usb_to_hw(urb->context));
 421                 break;
 422         default:
 423                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 424                         (unsigned int)hdr->id);
 425                 goto resubmit;
 426         }
 427
 428 resubmit:
 429         r = usb_submit_urb(urb, GFP_ATOMIC);
 430         if (r) {
 431                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
 432                 goto kfree;
 433         }
 434         return;
 435 kfree:
 436         kfree(urb->transfer_buffer);
 437 }
 438
 439 static inline int int_urb_interval(struct usb_device *udev)
 440 {
 441         switch (udev->speed) {
 442         case USB_SPEED_HIGH:
 443                 return 4;
 444         case USB_SPEED_LOW:
 445                 return 10;
 446         case USB_SPEED_FULL:
 447         default:
 448                 return 1;
 449         }
 450 }
 451
 452 static inline int usb_int_enabled(struct zd_usb *usb)
 453 {
 454         unsigned long flags;
 455         struct zd_usb_interrupt *intr = &usb->intr;
 456         struct urb *urb;
 457
 458         spin_lock_irqsave(&intr->lock, flags);
 459         urb = intr->urb;
 460         spin_unlock_irqrestore(&intr->lock, flags);
 461         return urb != NULL;
 462 }
 463
 464 int zd_usb_enable_int(struct zd_usb *usb)
 465 {
 466         int r;
 467         struct usb_device *udev;
 468         struct zd_usb_interrupt *intr = &usb->intr;
 469         void *transfer_buffer = NULL;
 470         struct urb *urb;
 471
 472         dev_dbg_f(zd_usb_dev(usb), "\n");
 473
 474         urb = usb_alloc_urb(0, GFP_KERNEL);
 475         if (!urb) {
 476                 r = -ENOMEM;
 477                 goto out;
 478         }
 479
 480         ZD_ASSERT(!irqs_disabled());
 481         spin_lock_irq(&intr->lock);
 482         if (intr->urb) {
 483                 spin_unlock_irq(&intr->lock);
 484                 r = 0;
 485                 goto error_free_urb;
 486         }
 487         intr->urb = urb;
 488         spin_unlock_irq(&intr->lock);
 489
 490         /* TODO: make it a DMA buffer */
 491         r = -ENOMEM;
 492         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
 493         if (!transfer_buffer) {
 494                 dev_dbg_f(zd_usb_dev(usb),
 495                         "couldn't allocate transfer_buffer\n");
 496                 goto error_set_urb_null;
 497         }
 498
 499         udev = zd_usb_to_usbdev(usb);
 500         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 501                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
 502                          int_urb_complete, usb,
 503                          intr->interval);
 504
 505         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 506         r = usb_submit_urb(urb, GFP_KERNEL);
 507         if (r) {
 508                 dev_dbg_f(zd_usb_dev(usb),
 509                          "Couldn't submit urb. Error number %d\n", r);
 510                 goto error;
 511         }
 512
 513         return 0;
 514 error:
 515         kfree(transfer_buffer);
 516 error_set_urb_null:
 517         spin_lock_irq(&intr->lock);
 518         intr->urb = NULL;
 519         spin_unlock_irq(&intr->lock);
 520 error_free_urb:
 521         usb_free_urb(urb);
 522 out:
 523         return r;
 524 }
 525
 526 void zd_usb_disable_int(struct zd_usb *usb)
 527 {
 528         unsigned long flags;
 529         struct zd_usb_interrupt *intr = &usb->intr;
 530         struct urb *urb;
 531
 532         spin_lock_irqsave(&intr->lock, flags);
 533         urb = intr->urb;
 534         if (!urb) {
 535                 spin_unlock_irqrestore(&intr->lock, flags);
 536                 return;
 537         }
 538         intr->urb = NULL;
 539         spin_unlock_irqrestore(&intr->lock, flags);
 540
 541         usb_kill_urb(urb);
 542         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 543         usb_free_urb(urb);
 544 }
 545
 546 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 547                              unsigned int length)
 548 {
 549         int i;
 550         const struct rx_length_info *length_info;
 551
 552         if (length < sizeof(struct rx_length_info)) {
 553                 /* It's not a complete packet anyhow. */
 554                 return;
 555         }
 556         length_info = (struct rx_length_info *)
 557                 (buffer + length - sizeof(struct rx_length_info));
 558
 559         /* It might be that three frames are merged into a single URB
 560          * transaction. We have to check for the length info tag.
 561          *
 562          * While testing we discovered that length_info might be unaligned,
 563          * because if USB transactions are merged, the last packet will not
 564          * be padded. Unaligned access might also happen if the length_info
 565          * structure is not present.
 566          */
 567         if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG)
 568         {
 569                 unsigned int l, k, n;
 570                 for (i = 0, l = 0;; i++) {
 571                         k = get_unaligned_le16(&length_info->length[i]);
 572                         if (k == 0)
 573                                 return;
 574                         n = l+k;
 575                         if (n > length)
 576                                 return;
 577                         zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
 578                         if (i >= 2)
 579                                 return;
 580                         l = (n+3) & ~3;
 581                 }
 582         } else {
 583                 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
 584         }
 585 }
 586
 587 static void rx_urb_complete(struct urb *urb)
 588 {
 589         struct zd_usb *usb;
 590         struct zd_usb_rx *rx;
 591         const u8 *buffer;
 592         unsigned int length;
 593
 594         switch (urb->status) {
 595         case 0:
 596                 break;
 597         case -ESHUTDOWN:
 598         case -EINVAL:
 599         case -ENODEV:
 600         case -ENOENT:
 601         case -ECONNRESET:
 602         case -EPIPE:
 603                 return;
 604         default:
 605                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 606                 goto resubmit;
 607         }
 608
 609         buffer = urb->transfer_buffer;
 610         length = urb->actual_length;
 611         usb = urb->context;
 612         rx = &usb->rx;
 613
 614         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 615                 /* If there is an old first fragment, we don't care. */
 616                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 617                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 618                 spin_lock(&rx->lock);
 619                 memcpy(rx->fragment, buffer, length);
 620                 rx->fragment_length = length;
 621                 spin_unlock(&rx->lock);
 622                 goto resubmit;
 623         }
 624
 625         spin_lock(&rx->lock);
 626         if (rx->fragment_length > 0) {
 627                 /* We are on a second fragment, we believe */
 628                 ZD_ASSERT(length + rx->fragment_length <=
 629                           ARRAY_SIZE(rx->fragment));
 630                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 631                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 632                 handle_rx_packet(usb, rx->fragment,
 633                                  rx->fragment_length + length);
 634                 rx->fragment_length = 0;
 635                 spin_unlock(&rx->lock);
 636         } else {
 637                 spin_unlock(&rx->lock);
 638                 handle_rx_packet(usb, buffer, length);
 639         }
 640
 641 resubmit:
 642         usb_submit_urb(urb, GFP_ATOMIC);
 643 }
 644
 645 static struct urb *alloc_rx_urb(struct zd_usb *usb)
 646 {
 647         struct usb_device *udev = zd_usb_to_usbdev(usb);
 648         struct urb *urb;
 649         void *buffer;
 650
 651         urb = usb_alloc_urb(0, GFP_KERNEL);
 652         if (!urb)
 653                 return NULL;
 654         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
 655                                   &urb->transfer_dma);
 656         if (!buffer) {
 657                 usb_free_urb(urb);
 658                 return NULL;
 659         }
 660
 661         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 662                           buffer, USB_MAX_RX_SIZE,
 663                           rx_urb_complete, usb);
 664         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 665
 666         return urb;
 667 }
 668
 669 static void free_rx_urb(struct urb *urb)
 670 {
 671         if (!urb)
 672                 return;
 673         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 674                         urb->transfer_buffer, urb->transfer_dma);
 675         usb_free_urb(urb);
 676 }
 677
 678 int zd_usb_enable_rx(struct zd_usb *usb)
 679 {
 680         int i, r;
 681         struct zd_usb_rx *rx = &usb->rx;
 682         struct urb **urbs;
 683
 684         dev_dbg_f(zd_usb_dev(usb), "\n");
 685
 686         r = -ENOMEM;
 687         urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
 688         if (!urbs)
 689                 goto error;
 690         for (i = 0; i < RX_URBS_COUNT; i++) {
 691                 urbs[i] = alloc_rx_urb(usb);
 692                 if (!urbs[i])
 693                         goto error;
 694         }
 695
 696         ZD_ASSERT(!irqs_disabled());
 697         spin_lock_irq(&rx->lock);
 698         if (rx->urbs) {
 699                 spin_unlock_irq(&rx->lock);
 700                 r = 0;
 701                 goto error;
 702         }
 703         rx->urbs = urbs;
 704         rx->urbs_count = RX_URBS_COUNT;
 705         spin_unlock_irq(&rx->lock);
 706
 707         for (i = 0; i < RX_URBS_COUNT; i++) {
 708                 r = usb_submit_urb(urbs[i], GFP_KERNEL);
 709                 if (r)
 710                         goto error_submit;
 711         }
 712
 713         return 0;
 714 error_submit:
 715         for (i = 0; i < RX_URBS_COUNT; i++) {
 716                 usb_kill_urb(urbs[i]);
 717         }
 718         spin_lock_irq(&rx->lock);
 719         rx->urbs = NULL;
 720         rx->urbs_count = 0;
 721         spin_unlock_irq(&rx->lock);
 722 error:
 723         if (urbs) {
 724                 for (i = 0; i < RX_URBS_COUNT; i++)
 725                         free_rx_urb(urbs[i]);
 726         }
 727         return r;
 728 }
 729
 730 void zd_usb_disable_rx(struct zd_usb *usb)
 731 {
 732         int i;
 733         unsigned long flags;
 734         struct urb **urbs;
 735         unsigned int count;
 736         struct zd_usb_rx *rx = &usb->rx;
 737
 738         spin_lock_irqsave(&rx->lock, flags);
 739         urbs = rx->urbs;
 740         count = rx->urbs_count;
 741         spin_unlock_irqrestore(&rx->lock, flags);
 742         if (!urbs)
 743                 return;
 744
 745         for (i = 0; i < count; i++) {
 746                 usb_kill_urb(urbs[i]);
 747                 free_rx_urb(urbs[i]);
 748         }
 749         kfree(urbs);
 750
 751         spin_lock_irqsave(&rx->lock, flags);
 752         rx->urbs = NULL;
 753         rx->urbs_count = 0;
 754         spin_unlock_irqrestore(&rx->lock, flags);
 755 }
 756
 757 /**
 758  * zd_usb_disable_tx - disable transmission
 759  * @usb: the zd1211rw-private USB structure
 760  *
 761  * Frees all URBs in the free list and marks the transmission as disabled.
 762  */
 763 void zd_usb_disable_tx(struct zd_usb *usb)
 764 {
 765         struct zd_usb_tx *tx = &usb->tx;
 766         unsigned long flags;
 767         struct list_head *pos, *n;
 768
 769         spin_lock_irqsave(&tx->lock, flags);
 770         list_for_each_safe(pos, n, &tx->free_urb_list) {
 771                 list_del(pos);
 772                 usb_free_urb(list_entry(pos, struct urb, urb_list));
 773         }
 774         tx->enabled = 0;
 775         tx->submitted_urbs = 0;
 776         /* The stopped state is ignored, relying on ieee80211_wake_queues()
 777          * in a potentionally following zd_usb_enable_tx().
 778          */
 779         spin_unlock_irqrestore(&tx->lock, flags);
 780 }
 781
 782 /**
 783  * zd_usb_enable_tx - enables transmission
 784  * @usb: a &struct zd_usb pointer
 785  *
 786  * This function enables transmission and prepares the &zd_usb_tx data
 787  * structure.
 788  */
 789 void zd_usb_enable_tx(struct zd_usb *usb)
 790 {
 791         unsigned long flags;
 792         struct zd_usb_tx *tx = &usb->tx;
 793
 794         spin_lock_irqsave(&tx->lock, flags);
 795         tx->enabled = 1;
 796         tx->submitted_urbs = 0;
 797         ieee80211_wake_queues(zd_usb_to_hw(usb));
 798         tx->stopped = 0;
 799         spin_unlock_irqrestore(&tx->lock, flags);
 800 }
 801
 802 /**
 803  * alloc_tx_urb - provides an tx URB
 804  * @usb: a &struct zd_usb pointer
 805  *
 806  * Allocates a new URB. If possible takes the urb from the free list in
 807  * usb->tx.
 808  */
 809 static struct urb *alloc_tx_urb(struct zd_usb *usb)
 810 {
 811         struct zd_usb_tx *tx = &usb->tx;
 812         unsigned long flags;
 813         struct list_head *entry;
 814         struct urb *urb;
 815
 816         spin_lock_irqsave(&tx->lock, flags);
 817         if (list_empty(&tx->free_urb_list)) {
 818                 urb = usb_alloc_urb(0, GFP_ATOMIC);
 819                 goto out;
 820         }
 821         entry = tx->free_urb_list.next;
 822         list_del(entry);
 823         urb = list_entry(entry, struct urb, urb_list);
 824 out:
 825         spin_unlock_irqrestore(&tx->lock, flags);
 826         return urb;
 827 }
 828
 829 /**
 830  * free_tx_urb - frees a used tx URB
 831  * @usb: a &struct zd_usb pointer
 832  * @urb: URB to be freed
 833  *
 834  * Frees the the transmission URB, which means to put it on the free URB
 835  * list.
 836  */
 837 static void free_tx_urb(struct zd_usb *usb, struct urb *urb)
 838 {
 839         struct zd_usb_tx *tx = &usb->tx;
 840         unsigned long flags;
 841
 842         spin_lock_irqsave(&tx->lock, flags);
 843         if (!tx->enabled) {
 844                 usb_free_urb(urb);
 845                 goto out;
 846         }
 847         list_add(&urb->urb_list, &tx->free_urb_list);
 848 out:
 849         spin_unlock_irqrestore(&tx->lock, flags);
 850 }
 851
 852 static void tx_dec_submitted_urbs(struct zd_usb *usb)
 853 {
 854         struct zd_usb_tx *tx = &usb->tx;
 855         unsigned long flags;
 856
 857         spin_lock_irqsave(&tx->lock, flags);
 858         --tx->submitted_urbs;
 859         if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) {
 860                 ieee80211_wake_queues(zd_usb_to_hw(usb));
 861                 tx->stopped = 0;
 862         }
 863         spin_unlock_irqrestore(&tx->lock, flags);
 864 }
 865
 866 static void tx_inc_submitted_urbs(struct zd_usb *usb)
 867 {
 868         struct zd_usb_tx *tx = &usb->tx;
 869         unsigned long flags;
 870
 871         spin_lock_irqsave(&tx->lock, flags);
 872         ++tx->submitted_urbs;
 873         if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
 874                 ieee80211_stop_queues(zd_usb_to_hw(usb));
 875                 tx->stopped = 1;
 876         }
 877         spin_unlock_irqrestore(&tx->lock, flags);
 878 }
 879
 880 /**
 881  * tx_urb_complete - completes the execution of an URB
 882  * @urb: a URB
 883  *
 884  * This function is called if the URB has been transferred to a device or an
 885  * error has happened.
 886  */
 887 static void tx_urb_complete(struct urb *urb)
 888 {
 889         int r;
 890         struct sk_buff *skb;
 891         struct ieee80211_tx_info *info;
 892         struct zd_usb *usb;
 893
 894         switch (urb->status) {
 895         case 0:
 896                 break;
 897         case -ESHUTDOWN:
 898         case -EINVAL:
 899         case -ENODEV:
 900         case -ENOENT:
 901         case -ECONNRESET:
 902         case -EPIPE:
 903                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 904                 break;
 905         default:
 906                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 907                 goto resubmit;
 908         }
 909 free_urb:
 910         skb = (struct sk_buff *)urb->context;
 911         /*
 912          * grab 'usb' pointer before handing off the skb (since
 913          * it might be freed by zd_mac_tx_to_dev or mac80211)
 914          */
 915         info = IEEE80211_SKB_CB(skb);
 916         usb = &zd_hw_mac(info->rate_driver_data[0])->chip.usb;
 917         zd_mac_tx_to_dev(skb, urb->status);
 918         free_tx_urb(usb, urb);
 919         tx_dec_submitted_urbs(usb);
 920         return;
 921 resubmit:
 922         r = usb_submit_urb(urb, GFP_ATOMIC);
 923         if (r) {
 924                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 925                 goto free_urb;
 926         }
 927 }
 928
 929 /**
 930  * zd_usb_tx: initiates transfer of a frame of the device
 931  *
 932  * @usb: the zd1211rw-private USB structure
 933  * @skb: a &struct sk_buff pointer
 934  *
 935  * This function tranmits a frame to the device. It doesn't wait for
 936  * completion. The frame must contain the control set and have all the
 937  * control set information available.
 938  *
 939  * The function returns 0 if the transfer has been successfully initiated.
 940  */
 941 int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
 942 {
 943         int r;
 944         struct usb_device *udev = zd_usb_to_usbdev(usb);
 945         struct urb *urb;
 946
 947         urb = alloc_tx_urb(usb);
 948         if (!urb) {
 949                 r = -ENOMEM;
 950                 goto out;
 951         }
 952
 953         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 954                           skb->data, skb->len, tx_urb_complete, skb);
 955
 956         r = usb_submit_urb(urb, GFP_ATOMIC);
 957         if (r)
 958                 goto error;
 959         tx_inc_submitted_urbs(usb);
 960         return 0;
 961 error:
 962         free_tx_urb(usb, urb);
 963 out:
 964         return r;
 965 }
 966
 967 static inline void init_usb_interrupt(struct zd_usb *usb)
 968 {
 969         struct zd_usb_interrupt *intr = &usb->intr;
 970
 971         spin_lock_init(&intr->lock);
 972         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 973         init_completion(&intr->read_regs.completion);
 974         intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
 975 }
 976
 977 static inline void init_usb_rx(struct zd_usb *usb)
 978 {
 979         struct zd_usb_rx *rx = &usb->rx;
 980         spin_lock_init(&rx->lock);
 981         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 982                 rx->usb_packet_size = 512;
 983         } else {
 984                 rx->usb_packet_size = 64;
 985         }
 986         ZD_ASSERT(rx->fragment_length == 0);
 987 }
 988
 989 static inline void init_usb_tx(struct zd_usb *usb)
 990 {
 991         struct zd_usb_tx *tx = &usb->tx;
 992         spin_lock_init(&tx->lock);
 993         tx->enabled = 0;
 994         tx->stopped = 0;
 995         INIT_LIST_HEAD(&tx->free_urb_list);
 996         tx->submitted_urbs = 0;
 997 }
 998
 999 void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
1000                  struct usb_interface *intf)
1001 {
1002         memset(usb, 0, sizeof(*usb));
1003         usb->intf = usb_get_intf(intf);
1004         usb_set_intfdata(usb->intf, hw);
1005         init_usb_interrupt(usb);
1006         init_usb_tx(usb);
1007         init_usb_rx(usb);
1008 }
1009
1010 void zd_usb_clear(struct zd_usb *usb)
1011 {
1012         usb_set_intfdata(usb->intf, NULL);
1013         usb_put_intf(usb->intf);
1014         ZD_MEMCLEAR(usb, sizeof(*usb));
1015         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
1016 }
1017
1018 static const char *speed(enum usb_device_speed speed)
1019 {
1020         switch (speed) {
1021         case USB_SPEED_LOW:
1022                 return "low";
1023         case USB_SPEED_FULL:
1024                 return "full";
1025         case USB_SPEED_HIGH:
1026                 return "high";
1027         default:
1028                 return "unknown speed";
1029         }
1030 }
1031
1032 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
1033 {
1034         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1035                 le16_to_cpu(udev->descriptor.idVendor),
1036                 le16_to_cpu(udev->descriptor.idProduct),
1037                 get_bcdDevice(udev),
1038                 speed(udev->speed));
1039 }
1040
1041 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1042 {
1043         struct usb_device *udev = interface_to_usbdev(usb->intf);
1044         return scnprint_id(udev, buffer, size);
1045 }
1046
1047 #ifdef DEBUG
1048 static void print_id(struct usb_device *udev)
1049 {
1050         char buffer[40];
1051
1052         scnprint_id(udev, buffer, sizeof(buffer));
1053         buffer[sizeof(buffer)-1] = 0;
1054         dev_dbg_f(&udev->dev, "%s\n", buffer);
1055 }
1056 #else
1057 #define print_id(udev) do { } while (0)
1058 #endif
1059
1060 static int eject_installer(struct usb_interface *intf)
1061 {
1062         struct usb_device *udev = interface_to_usbdev(intf);
1063         struct usb_host_interface *iface_desc = &intf->altsetting[0];
1064         struct usb_endpoint_descriptor *endpoint;
1065         unsigned char *cmd;
1066         u8 bulk_out_ep;
1067         int r;
1068
1069         /* Find bulk out endpoint */
1070         endpoint = &iface_desc->endpoint[1].desc;
1071         if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
1072             usb_endpoint_xfer_bulk(endpoint)) {
1073                 bulk_out_ep = endpoint->bEndpointAddress;
1074         } else {
1075                 dev_err(&udev->dev,
1076                         "zd1211rw: Could not find bulk out endpoint\n");
1077                 return -ENODEV;
1078         }
1079
1080         cmd = kzalloc(31, GFP_KERNEL);
1081         if (cmd == NULL)
1082                 return -ENODEV;
1083
1084         /* USB bulk command block */
1085         cmd[0] = 0x55;  /* bulk command signature */
1086         cmd[1] = 0x53;  /* bulk command signature */
1087         cmd[2] = 0x42;  /* bulk command signature */
1088         cmd[3] = 0x43;  /* bulk command signature */
1089         cmd[14] = 6;    /* command length */
1090
1091         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1092         cmd[19] = 0x2;  /* eject disc */
1093
1094         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1095         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1096                 cmd, 31, NULL, 2000);
1097         kfree(cmd);
1098         if (r)
1099                 return r;
1100
1101         /* At this point, the device disconnects and reconnects with the real
1102          * ID numbers. */
1103
1104         usb_set_intfdata(intf, NULL);
1105         return 0;
1106 }
1107
1108 int zd_usb_init_hw(struct zd_usb *usb)
1109 {
1110         int r;
1111         struct zd_mac *mac = zd_usb_to_mac(usb);
1112
1113         dev_dbg_f(zd_usb_dev(usb), "\n");
1114
1115         r = upload_firmware(usb);
1116         if (r) {
1117                 dev_err(zd_usb_dev(usb),
1118                        "couldn't load firmware. Error number %d\n", r);
1119                 return r;
1120         }
1121
1122         r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1123         if (r) {
1124                 dev_dbg_f(zd_usb_dev(usb),
1125                         "couldn't reset configuration. Error number %d\n", r);
1126                 return r;
1127         }
1128
1129         r = zd_mac_init_hw(mac->hw);
1130         if (r) {
1131                 dev_dbg_f(zd_usb_dev(usb),
1132                          "couldn't initialize mac. Error number %d\n", r);
1133                 return r;
1134         }
1135
1136         usb->initialized = 1;
1137         return 0;
1138 }
1139
1140 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1141 {
1142         int r;
1143         struct usb_device *udev = interface_to_usbdev(intf);
1144         struct zd_usb *usb;
1145         struct ieee80211_hw *hw = NULL;
1146
1147         print_id(udev);
1148
1149         if (id->driver_info & DEVICE_INSTALLER)
1150                 return eject_installer(intf);
1151
1152         switch (udev->speed) {
1153         case USB_SPEED_LOW:
1154         case USB_SPEED_FULL:
1155         case USB_SPEED_HIGH:
1156                 break;
1157         default:
1158                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1159                 r = -ENODEV;
1160                 goto error;
1161         }
1162
1163         r = usb_reset_device(udev);
1164         if (r) {
1165                 dev_err(&intf->dev,
1166                         "couldn't reset usb device. Error number %d\n", r);
1167                 goto error;
1168         }
1169
1170         hw = zd_mac_alloc_hw(intf);
1171         if (hw == NULL) {
1172                 r = -ENOMEM;
1173                 goto error;
1174         }
1175
1176         usb = &zd_hw_mac(hw)->chip.usb;
1177         usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1178
1179         r = zd_mac_preinit_hw(hw);
1180         if (r) {
1181                 dev_dbg_f(&intf->dev,
1182                          "couldn't initialize mac. Error number %d\n", r);
1183                 goto error;
1184         }
1185
1186         r = ieee80211_register_hw(hw);
1187         if (r) {
1188                 dev_dbg_f(&intf->dev,
1189                          "couldn't register device. Error number %d\n", r);
1190                 goto error;
1191         }
1192
1193         dev_dbg_f(&intf->dev, "successful\n");
1194         dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
1195         return 0;
1196 error:
1197         usb_reset_device(interface_to_usbdev(intf));
1198         if (hw) {
1199                 zd_mac_clear(zd_hw_mac(hw));
1200                 ieee80211_free_hw(hw);
1201         }
1202         return r;
1203 }
1204
1205 static void disconnect(struct usb_interface *intf)
1206 {
1207         struct ieee80211_hw *hw = zd_intf_to_hw(intf);
1208         struct zd_mac *mac;
1209         struct zd_usb *usb;
1210
1211         /* Either something really bad happened, or we're just dealing with
1212          * a DEVICE_INSTALLER. */
1213         if (hw == NULL)
1214                 return;
1215
1216         mac = zd_hw_mac(hw);
1217         usb = &mac->chip.usb;
1218
1219         dev_dbg_f(zd_usb_dev(usb), "\n");
1220
1221         ieee80211_unregister_hw(hw);
1222
1223         /* Just in case something has gone wrong! */
1224         zd_usb_disable_rx(usb);
1225         zd_usb_disable_int(usb);
1226
1227         /* If the disconnect has been caused by a removal of the
1228          * driver module, the reset allows reloading of the driver. If the
1229          * reset will not be executed here, the upload of the firmware in the
1230          * probe function caused by the reloading of the driver will fail.
1231          */
1232         usb_reset_device(interface_to_usbdev(intf));
1233
1234         zd_mac_clear(mac);
1235         ieee80211_free_hw(hw);
1236         dev_dbg(&intf->dev, "disconnected\n");
1237 }
1238
1239 static struct usb_driver driver = {
1240         .name           = KBUILD_MODNAME,
1241         .id_table       = usb_ids,
1242         .probe          = probe,
1243         .disconnect     = disconnect,
1244 };
1245
1246 struct workqueue_struct *zd_workqueue;
1247
1248 static int __init usb_init(void)
1249 {
1250         int r;
1251
1252         pr_debug("%s usb_init()\n", driver.name);
1253
1254         zd_workqueue = create_singlethread_workqueue(driver.name);
1255         if (zd_workqueue == NULL) {
1256                 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1257                 return -ENOMEM;
1258         }
1259
1260         r = usb_register(&driver);
1261         if (r) {
1262                 destroy_workqueue(zd_workqueue);
1263                 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1264                        driver.name, r);
1265                 return r;
1266         }
1267
1268         pr_debug("%s initialized\n", driver.name);
1269         return 0;
1270 }
1271
1272 static void __exit usb_exit(void)
1273 {
1274         pr_debug("%s usb_exit()\n", driver.name);
1275         usb_deregister(&driver);
1276         destroy_workqueue(zd_workqueue);
1277 }
1278
1279 module_init(usb_init);
1280 module_exit(usb_exit);
1281
1282 static int usb_int_regs_length(unsigned int count)
1283 {
1284         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1285 }
1286
1287 static void prepare_read_regs_int(struct zd_usb *usb)
1288 {
1289         struct zd_usb_interrupt *intr = &usb->intr;
1290
1291         spin_lock_irq(&intr->lock);
1292         intr->read_regs_enabled = 1;
1293         INIT_COMPLETION(intr->read_regs.completion);
1294         spin_unlock_irq(&intr->lock);
1295 }
1296
1297 static void disable_read_regs_int(struct zd_usb *usb)
1298 {
1299         struct zd_usb_interrupt *intr = &usb->intr;
1300
1301         spin_lock_irq(&intr->lock);
1302         intr->read_regs_enabled = 0;
1303         spin_unlock_irq(&intr->lock);
1304 }
1305
1306 static int get_results(struct zd_usb *usb, u16 *values,
1307                        struct usb_req_read_regs *req, unsigned int count)
1308 {
1309         int r;
1310         int i;
1311         struct zd_usb_interrupt *intr = &usb->intr;
1312         struct read_regs_int *rr = &intr->read_regs;
1313         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1314
1315         spin_lock_irq(&intr->lock);
1316
1317         r = -EIO;
1318         /* The created block size seems to be larger than expected.
1319          * However results appear to be correct.
1320          */
1321         if (rr->length < usb_int_regs_length(count)) {
1322                 dev_dbg_f(zd_usb_dev(usb),
1323                          "error: actual length %d less than expected %d\n",
1324                          rr->length, usb_int_regs_length(count));
1325                 goto error_unlock;
1326         }
1327         if (rr->length > sizeof(rr->buffer)) {
1328                 dev_dbg_f(zd_usb_dev(usb),
1329                          "error: actual length %d exceeds buffer size %zu\n",
1330                          rr->length, sizeof(rr->buffer));
1331                 goto error_unlock;
1332         }
1333
1334         for (i = 0; i < count; i++) {
1335                 struct reg_data *rd = &regs->regs[i];
1336                 if (rd->addr != req->addr[i]) {
1337                         dev_dbg_f(zd_usb_dev(usb),
1338                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1339                                  le16_to_cpu(rd->addr),
1340                                  le16_to_cpu(req->addr[i]));
1341                         goto error_unlock;
1342                 }
1343                 values[i] = le16_to_cpu(rd->value);
1344         }
1345
1346         r = 0;
1347 error_unlock:
1348         spin_unlock_irq(&intr->lock);
1349         return r;
1350 }
1351
1352 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1353                      const zd_addr_t *addresses, unsigned int count)
1354 {
1355         int r;
1356         int i, req_len, actual_req_len;
1357         struct usb_device *udev;
1358         struct usb_req_read_regs *req = NULL;
1359         unsigned long timeout;
1360
1361         if (count < 1) {
1362                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1363                 return -EINVAL;
1364         }
1365         if (count > USB_MAX_IOREAD16_COUNT) {
1366                 dev_dbg_f(zd_usb_dev(usb),
1367                          "error: count %u exceeds possible max %u\n",
1368                          count, USB_MAX_IOREAD16_COUNT);
1369                 return -EINVAL;
1370         }
1371         if (in_atomic()) {
1372                 dev_dbg_f(zd_usb_dev(usb),
1373                          "error: io in atomic context not supported\n");
1374                 return -EWOULDBLOCK;
1375         }
1376         if (!usb_int_enabled(usb)) {
1377                  dev_dbg_f(zd_usb_dev(usb),
1378                           "error: usb interrupt not enabled\n");
1379                 return -EWOULDBLOCK;
1380         }
1381
1382         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1383         req = kmalloc(req_len, GFP_KERNEL);
1384         if (!req)
1385                 return -ENOMEM;
1386         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1387         for (i = 0; i < count; i++)
1388                 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1389
1390         udev = zd_usb_to_usbdev(usb);
1391         prepare_read_regs_int(usb);
1392         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1393                          req, req_len, &actual_req_len, 1000 /* ms */);
1394         if (r) {
1395                 dev_dbg_f(zd_usb_dev(usb),
1396                         "error in usb_bulk_msg(). Error number %d\n", r);
1397                 goto error;
1398         }
1399         if (req_len != actual_req_len) {
1400                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1401                         " req_len %d != actual_req_len %d\n",
1402                         req_len, actual_req_len);
1403                 r = -EIO;
1404                 goto error;
1405         }
1406
1407         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1408                                               msecs_to_jiffies(1000));
1409         if (!timeout) {
1410                 disable_read_regs_int(usb);
1411                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1412                 r = -ETIMEDOUT;
1413                 goto error;
1414         }
1415
1416         r = get_results(usb, values, req, count);
1417 error:
1418         kfree(req);
1419         return r;
1420 }
1421
1422 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1423                       unsigned int count)
1424 {
1425         int r;
1426         struct usb_device *udev;
1427         struct usb_req_write_regs *req = NULL;
1428         int i, req_len, actual_req_len;
1429
1430         if (count == 0)
1431                 return 0;
1432         if (count > USB_MAX_IOWRITE16_COUNT) {
1433                 dev_dbg_f(zd_usb_dev(usb),
1434                         "error: count %u exceeds possible max %u\n",
1435                         count, USB_MAX_IOWRITE16_COUNT);
1436                 return -EINVAL;
1437         }
1438         if (in_atomic()) {
1439                 dev_dbg_f(zd_usb_dev(usb),
1440                         "error: io in atomic context not supported\n");
1441                 return -EWOULDBLOCK;
1442         }
1443
1444         req_len = sizeof(struct usb_req_write_regs) +
1445                   count * sizeof(struct reg_data);
1446         req = kmalloc(req_len, GFP_KERNEL);
1447         if (!req)
1448                 return -ENOMEM;
1449
1450         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1451         for (i = 0; i < count; i++) {
1452                 struct reg_data *rw  = &req->reg_writes[i];
1453                 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1454                 rw->value = cpu_to_le16(ioreqs[i].value);
1455         }
1456
1457         udev = zd_usb_to_usbdev(usb);
1458         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1459                          req, req_len, &actual_req_len, 1000 /* ms */);
1460         if (r) {
1461                 dev_dbg_f(zd_usb_dev(usb),
1462                         "error in usb_bulk_msg(). Error number %d\n", r);
1463                 goto error;
1464         }
1465         if (req_len != actual_req_len) {
1466                 dev_dbg_f(zd_usb_dev(usb),
1467                         "error in usb_bulk_msg()"
1468                         " req_len %d != actual_req_len %d\n",
1469                         req_len, actual_req_len);
1470                 r = -EIO;
1471                 goto error;
1472         }
1473
1474         /* FALL-THROUGH with r == 0 */
1475 error:
1476         kfree(req);
1477         return r;
1478 }
1479
1480 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1481 {
1482         int r;
1483         struct usb_device *udev;
1484         struct usb_req_rfwrite *req = NULL;
1485         int i, req_len, actual_req_len;
1486         u16 bit_value_template;
1487
1488         if (in_atomic()) {
1489                 dev_dbg_f(zd_usb_dev(usb),
1490                         "error: io in atomic context not supported\n");
1491                 return -EWOULDBLOCK;
1492         }
1493         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1494                 dev_dbg_f(zd_usb_dev(usb),
1495                         "error: bits %d are smaller than"
1496                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1497                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1498                 return -EINVAL;
1499         }
1500         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1501                 dev_dbg_f(zd_usb_dev(usb),
1502                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1503                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1504                 return -EINVAL;
1505         }
1506 #ifdef DEBUG
1507         if (value & (~0UL << bits)) {
1508                 dev_dbg_f(zd_usb_dev(usb),
1509                         "error: value %#09x has bits >= %d set\n",
1510                         value, bits);
1511                 return -EINVAL;
1512         }
1513 #endif /* DEBUG */
1514
1515         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1516
1517         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1518         if (r) {
1519                 dev_dbg_f(zd_usb_dev(usb),
1520                         "error %d: Couldn't read CR203\n", r);
1521                 goto out;
1522         }
1523         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1524
1525         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1526         req = kmalloc(req_len, GFP_KERNEL);
1527         if (!req)
1528                 return -ENOMEM;
1529
1530         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1531         /* 1: 3683a, but not used in ZYDAS driver */
1532         req->value = cpu_to_le16(2);
1533         req->bits = cpu_to_le16(bits);
1534
1535         for (i = 0; i < bits; i++) {
1536                 u16 bv = bit_value_template;
1537                 if (value & (1 << (bits-1-i)))
1538                         bv |= RF_DATA;
1539                 req->bit_values[i] = cpu_to_le16(bv);
1540         }
1541
1542         udev = zd_usb_to_usbdev(usb);
1543         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1544                          req, req_len, &actual_req_len, 1000 /* ms */);
1545         if (r) {
1546                 dev_dbg_f(zd_usb_dev(usb),
1547                         "error in usb_bulk_msg(). Error number %d\n", r);
1548                 goto out;
1549         }
1550         if (req_len != actual_req_len) {
1551                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1552                         " req_len %d != actual_req_len %d\n",
1553                         req_len, actual_req_len);
1554                 r = -EIO;
1555                 goto out;
1556         }
1557
1558         /* FALL-THROUGH with r == 0 */
1559 out:
1560         kfree(req);
1561         return r;
1562 }