git.oblomov.eu Git - linux-2.6/blob - 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(0x07b8, 0x6001), .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         /* ZD1211B */
  62         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  63         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  64         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  65         { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
  66         { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
  67         { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
  68         { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
  69         { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
  70         { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
  71         { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
  72         { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
  73         { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
  74         { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
  75         { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
  76         { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
  77         { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
  78         { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
  79         { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
  80         { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
  81         { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
  82         { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
  83         /* "Driverless" devices that need ejecting */
  84         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
  85         { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
  86         {}
  87 };
  88
  89 MODULE_LICENSE("GPL");
  90 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
  91 MODULE_AUTHOR("Ulrich Kunitz");
  92 MODULE_AUTHOR("Daniel Drake");
  93 MODULE_VERSION("1.0");
  94 MODULE_DEVICE_TABLE(usb, usb_ids);
  95
  96 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
  97 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
  98
  99 /* USB device initialization */
 100 static void int_urb_complete(struct urb *urb);
 101
 102 static int request_fw_file(
 103         const struct firmware **fw, const char *name, struct device *device)
 104 {
 105         int r;
 106
 107         dev_dbg_f(device, "fw name %s\n", name);
 108
 109         r = request_firmware(fw, name, device);
 110         if (r)
 111                 dev_err(device,
 112                        "Could not load firmware file %s. Error number %d\n",
 113                        name, r);
 114         return r;
 115 }
 116
 117 static inline u16 get_bcdDevice(const struct usb_device *udev)
 118 {
 119         return le16_to_cpu(udev->descriptor.bcdDevice);
 120 }
 121
 122 enum upload_code_flags {
 123         REBOOT = 1,
 124 };
 125
 126 /* Ensures that MAX_TRANSFER_SIZE is even. */
 127 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 128
 129 static int upload_code(struct usb_device *udev,
 130         const u8 *data, size_t size, u16 code_offset, int flags)
 131 {
 132         u8 *p;
 133         int r;
 134
 135         /* USB request blocks need "kmalloced" buffers.
 136          */
 137         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 138         if (!p) {
 139                 dev_err(&udev->dev, "out of memory\n");
 140                 r = -ENOMEM;
 141                 goto error;
 142         }
 143
 144         size &= ~1;
 145         while (size > 0) {
 146                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 147                         size : MAX_TRANSFER_SIZE;
 148
 149                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 150
 151                 memcpy(p, data, transfer_size);
 152                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 153                         USB_REQ_FIRMWARE_DOWNLOAD,
 154                         USB_DIR_OUT | USB_TYPE_VENDOR,
 155                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 156                 if (r < 0) {
 157                         dev_err(&udev->dev,
 158                                "USB control request for firmware upload"
 159                                " failed. Error number %d\n", r);
 160                         goto error;
 161                 }
 162                 transfer_size = r & ~1;
 163
 164                 size -= transfer_size;
 165                 data += transfer_size;
 166                 code_offset += transfer_size/sizeof(u16);
 167         }
 168
 169         if (flags & REBOOT) {
 170                 u8 ret;
 171
 172                 /* Use "DMA-aware" buffer. */
 173                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 174                         USB_REQ_FIRMWARE_CONFIRM,
 175                         USB_DIR_IN | USB_TYPE_VENDOR,
 176                         0, 0, p, sizeof(ret), 5000 /* ms */);
 177                 if (r != sizeof(ret)) {
 178                         dev_err(&udev->dev,
 179                                 "control request firmeware confirmation failed."
 180                                 " Return value %d\n", r);
 181                         if (r >= 0)
 182                                 r = -ENODEV;
 183                         goto error;
 184                 }
 185                 ret = p[0];
 186                 if (ret & 0x80) {
 187                         dev_err(&udev->dev,
 188                                 "Internal error while downloading."
 189                                 " Firmware confirm return value %#04x\n",
 190                                 (unsigned int)ret);
 191                         r = -ENODEV;
 192                         goto error;
 193                 }
 194                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 195                         (unsigned int)ret);
 196         }
 197
 198         r = 0;
 199 error:
 200         kfree(p);
 201         return r;
 202 }
 203
 204 static u16 get_word(const void *data, u16 offset)
 205 {
 206         const __le16 *p = data;
 207         return le16_to_cpu(p[offset]);
 208 }
 209
 210 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
 211                        const char* postfix)
 212 {
 213         scnprintf(buffer, size, "%s%s",
 214                 usb->is_zd1211b ?
 215                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 216                 postfix);
 217         return buffer;
 218 }
 219
 220 static int handle_version_mismatch(struct zd_usb *usb,
 221         const struct firmware *ub_fw)
 222 {
 223         struct usb_device *udev = zd_usb_to_usbdev(usb);
 224         const struct firmware *ur_fw = NULL;
 225         int offset;
 226         int r = 0;
 227         char fw_name[128];
 228
 229         r = request_fw_file(&ur_fw,
 230                 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
 231                 &udev->dev);
 232         if (r)
 233                 goto error;
 234
 235         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
 236         if (r)
 237                 goto error;
 238
 239         offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
 240         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
 241                 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
 242
 243         /* At this point, the vendor driver downloads the whole firmware
 244          * image, hacks around with version IDs, and uploads it again,
 245          * completely overwriting the boot code. We do not do this here as
 246          * it is not required on any tested devices, and it is suspected to
 247          * cause problems. */
 248 error:
 249         release_firmware(ur_fw);
 250         return r;
 251 }
 252
 253 static int upload_firmware(struct zd_usb *usb)
 254 {
 255         int r;
 256         u16 fw_bcdDevice;
 257         u16 bcdDevice;
 258         struct usb_device *udev = zd_usb_to_usbdev(usb);
 259         const struct firmware *ub_fw = NULL;
 260         const struct firmware *uph_fw = NULL;
 261         char fw_name[128];
 262
 263         bcdDevice = get_bcdDevice(udev);
 264
 265         r = request_fw_file(&ub_fw,
 266                 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
 267                 &udev->dev);
 268         if (r)
 269                 goto error;
 270
 271         fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
 272
 273         if (fw_bcdDevice != bcdDevice) {
 274                 dev_info(&udev->dev,
 275                         "firmware version %#06x and device bootcode version "
 276                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
 277                 if (bcdDevice <= 0x4313)
 278                         dev_warn(&udev->dev, "device has old bootcode, please "
 279                                 "report success or failure\n");
 280
 281                 r = handle_version_mismatch(usb, ub_fw);
 282                 if (r)
 283                         goto error;
 284         } else {
 285                 dev_dbg_f(&udev->dev,
 286                         "firmware device id %#06x is equal to the "
 287                         "actual device id\n", fw_bcdDevice);
 288         }
 289
 290
 291         r = request_fw_file(&uph_fw,
 292                 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
 293                 &udev->dev);
 294         if (r)
 295                 goto error;
 296
 297         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
 298         if (r) {
 299                 dev_err(&udev->dev,
 300                         "Could not upload firmware code uph. Error number %d\n",
 301                         r);
 302         }
 303
 304         /* FALL-THROUGH */
 305 error:
 306         release_firmware(ub_fw);
 307         release_firmware(uph_fw);
 308         return r;
 309 }
 310
 311 /* Read data from device address space using "firmware interface" which does
 312  * not require firmware to be loaded. */
 313 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
 314 {
 315         int r;
 316         struct usb_device *udev = zd_usb_to_usbdev(usb);
 317         u8 *buf;
 318
 319         /* Use "DMA-aware" buffer. */
 320         buf = kmalloc(len, GFP_KERNEL);
 321         if (!buf)
 322                 return -ENOMEM;
 323         r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 324                 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
 325                 buf, len, 5000);
 326         if (r < 0) {
 327                 dev_err(&udev->dev,
 328                         "read over firmware interface failed: %d\n", r);
 329                 goto exit;
 330         } else if (r != len) {
 331                 dev_err(&udev->dev,
 332                         "incomplete read over firmware interface: %d/%d\n",
 333                         r, len);
 334                 r = -EIO;
 335                 goto exit;
 336         }
 337         r = 0;
 338         memcpy(data, buf, len);
 339 exit:
 340         kfree(buf);
 341         return r;
 342 }
 343
 344 #define urb_dev(urb) (&(urb)->dev->dev)
 345
 346 static inline void handle_regs_int(struct urb *urb)
 347 {
 348         struct zd_usb *usb = urb->context;
 349         struct zd_usb_interrupt *intr = &usb->intr;
 350         int len;
 351         u16 int_num;
 352
 353         ZD_ASSERT(in_interrupt());
 354         spin_lock(&intr->lock);
 355
 356         int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));
 357         if (int_num == CR_INTERRUPT) {
 358                 struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
 359                 memcpy(&mac->intr_buffer, urb->transfer_buffer,
 360                                 USB_MAX_EP_INT_BUFFER);
 361                 schedule_work(&mac->process_intr);
 362         } else if (intr->read_regs_enabled) {
 363                 intr->read_regs.length = len = urb->actual_length;
 364
 365                 if (len > sizeof(intr->read_regs.buffer))
 366                         len = sizeof(intr->read_regs.buffer);
 367                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 368                 intr->read_regs_enabled = 0;
 369                 complete(&intr->read_regs.completion);
 370                 goto out;
 371         }
 372
 373 out:
 374         spin_unlock(&intr->lock);
 375 }
 376
 377 static void int_urb_complete(struct urb *urb)
 378 {
 379         int r;
 380         struct usb_int_header *hdr;
 381
 382         switch (urb->status) {
 383         case 0:
 384                 break;
 385         case -ESHUTDOWN:
 386         case -EINVAL:
 387         case -ENODEV:
 388         case -ENOENT:
 389         case -ECONNRESET:
 390         case -EPIPE:
 391                 goto kfree;
 392         default:
 393                 goto resubmit;
 394         }
 395
 396         if (urb->actual_length < sizeof(hdr)) {
 397                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 398                 goto resubmit;
 399         }
 400
 401         hdr = urb->transfer_buffer;
 402         if (hdr->type != USB_INT_TYPE) {
 403                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 404                 goto resubmit;
 405         }
 406
 407         switch (hdr->id) {
 408         case USB_INT_ID_REGS:
 409                 handle_regs_int(urb);
 410                 break;
 411         case USB_INT_ID_RETRY_FAILED:
 412                 zd_mac_tx_failed(zd_usb_to_hw(urb->context));
 413                 break;
 414         default:
 415                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 416                         (unsigned int)hdr->id);
 417                 goto resubmit;
 418         }
 419
 420 resubmit:
 421         r = usb_submit_urb(urb, GFP_ATOMIC);
 422         if (r) {
 423                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
 424                 goto kfree;
 425         }
 426         return;
 427 kfree:
 428         kfree(urb->transfer_buffer);
 429 }
 430
 431 static inline int int_urb_interval(struct usb_device *udev)
 432 {
 433         switch (udev->speed) {
 434         case USB_SPEED_HIGH:
 435                 return 4;
 436         case USB_SPEED_LOW:
 437                 return 10;
 438         case USB_SPEED_FULL:
 439         default:
 440                 return 1;
 441         }
 442 }
 443
 444 static inline int usb_int_enabled(struct zd_usb *usb)
 445 {
 446         unsigned long flags;
 447         struct zd_usb_interrupt *intr = &usb->intr;
 448         struct urb *urb;
 449
 450         spin_lock_irqsave(&intr->lock, flags);
 451         urb = intr->urb;
 452         spin_unlock_irqrestore(&intr->lock, flags);
 453         return urb != NULL;
 454 }
 455
 456 int zd_usb_enable_int(struct zd_usb *usb)
 457 {
 458         int r;
 459         struct usb_device *udev;
 460         struct zd_usb_interrupt *intr = &usb->intr;
 461         void *transfer_buffer = NULL;
 462         struct urb *urb;
 463
 464         dev_dbg_f(zd_usb_dev(usb), "\n");
 465
 466         urb = usb_alloc_urb(0, GFP_KERNEL);
 467         if (!urb) {
 468                 r = -ENOMEM;
 469                 goto out;
 470         }
 471
 472         ZD_ASSERT(!irqs_disabled());
 473         spin_lock_irq(&intr->lock);
 474         if (intr->urb) {
 475                 spin_unlock_irq(&intr->lock);
 476                 r = 0;
 477                 goto error_free_urb;
 478         }
 479         intr->urb = urb;
 480         spin_unlock_irq(&intr->lock);
 481
 482         /* TODO: make it a DMA buffer */
 483         r = -ENOMEM;
 484         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
 485         if (!transfer_buffer) {
 486                 dev_dbg_f(zd_usb_dev(usb),
 487                         "couldn't allocate transfer_buffer\n");
 488                 goto error_set_urb_null;
 489         }
 490
 491         udev = zd_usb_to_usbdev(usb);
 492         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 493                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
 494                          int_urb_complete, usb,
 495                          intr->interval);
 496
 497         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 498         r = usb_submit_urb(urb, GFP_KERNEL);
 499         if (r) {
 500                 dev_dbg_f(zd_usb_dev(usb),
 501                          "Couldn't submit urb. Error number %d\n", r);
 502                 goto error;
 503         }
 504
 505         return 0;
 506 error:
 507         kfree(transfer_buffer);
 508 error_set_urb_null:
 509         spin_lock_irq(&intr->lock);
 510         intr->urb = NULL;
 511         spin_unlock_irq(&intr->lock);
 512 error_free_urb:
 513         usb_free_urb(urb);
 514 out:
 515         return r;
 516 }
 517
 518 void zd_usb_disable_int(struct zd_usb *usb)
 519 {
 520         unsigned long flags;
 521         struct zd_usb_interrupt *intr = &usb->intr;
 522         struct urb *urb;
 523
 524         spin_lock_irqsave(&intr->lock, flags);
 525         urb = intr->urb;
 526         if (!urb) {
 527                 spin_unlock_irqrestore(&intr->lock, flags);
 528                 return;
 529         }
 530         intr->urb = NULL;
 531         spin_unlock_irqrestore(&intr->lock, flags);
 532
 533         usb_kill_urb(urb);
 534         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 535         usb_free_urb(urb);
 536 }
 537
 538 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 539                              unsigned int length)
 540 {
 541         int i;
 542         const struct rx_length_info *length_info;
 543
 544         if (length < sizeof(struct rx_length_info)) {
 545                 /* It's not a complete packet anyhow. */
 546                 return;
 547         }
 548         length_info = (struct rx_length_info *)
 549                 (buffer + length - sizeof(struct rx_length_info));
 550
 551         /* It might be that three frames are merged into a single URB
 552          * transaction. We have to check for the length info tag.
 553          *
 554          * While testing we discovered that length_info might be unaligned,
 555          * because if USB transactions are merged, the last packet will not
 556          * be padded. Unaligned access might also happen if the length_info
 557          * structure is not present.
 558          */
 559         if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG)
 560         {
 561                 unsigned int l, k, n;
 562                 for (i = 0, l = 0;; i++) {
 563                         k = get_unaligned_le16(&length_info->length[i]);
 564                         if (k == 0)
 565                                 return;
 566                         n = l+k;
 567                         if (n > length)
 568                                 return;
 569                         zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
 570                         if (i >= 2)
 571                                 return;
 572                         l = (n+3) & ~3;
 573                 }
 574         } else {
 575                 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
 576         }
 577 }
 578
 579 static void rx_urb_complete(struct urb *urb)
 580 {
 581         struct zd_usb *usb;
 582         struct zd_usb_rx *rx;
 583         const u8 *buffer;
 584         unsigned int length;
 585
 586         switch (urb->status) {
 587         case 0:
 588                 break;
 589         case -ESHUTDOWN:
 590         case -EINVAL:
 591         case -ENODEV:
 592         case -ENOENT:
 593         case -ECONNRESET:
 594         case -EPIPE:
 595                 return;
 596         default:
 597                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 598                 goto resubmit;
 599         }
 600
 601         buffer = urb->transfer_buffer;
 602         length = urb->actual_length;
 603         usb = urb->context;
 604         rx = &usb->rx;
 605
 606         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 607                 /* If there is an old first fragment, we don't care. */
 608                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 609                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 610                 spin_lock(&rx->lock);
 611                 memcpy(rx->fragment, buffer, length);
 612                 rx->fragment_length = length;
 613                 spin_unlock(&rx->lock);
 614                 goto resubmit;
 615         }
 616
 617         spin_lock(&rx->lock);
 618         if (rx->fragment_length > 0) {
 619                 /* We are on a second fragment, we believe */
 620                 ZD_ASSERT(length + rx->fragment_length <=
 621                           ARRAY_SIZE(rx->fragment));
 622                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 623                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 624                 handle_rx_packet(usb, rx->fragment,
 625                                  rx->fragment_length + length);
 626                 rx->fragment_length = 0;
 627                 spin_unlock(&rx->lock);
 628         } else {
 629                 spin_unlock(&rx->lock);
 630                 handle_rx_packet(usb, buffer, length);
 631         }
 632
 633 resubmit:
 634         usb_submit_urb(urb, GFP_ATOMIC);
 635 }
 636
 637 static struct urb *alloc_rx_urb(struct zd_usb *usb)
 638 {
 639         struct usb_device *udev = zd_usb_to_usbdev(usb);
 640         struct urb *urb;
 641         void *buffer;
 642
 643         urb = usb_alloc_urb(0, GFP_KERNEL);
 644         if (!urb)
 645                 return NULL;
 646         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
 647                                   &urb->transfer_dma);
 648         if (!buffer) {
 649                 usb_free_urb(urb);
 650                 return NULL;
 651         }
 652
 653         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 654                           buffer, USB_MAX_RX_SIZE,
 655                           rx_urb_complete, usb);
 656         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 657
 658         return urb;
 659 }
 660
 661 static void free_rx_urb(struct urb *urb)
 662 {
 663         if (!urb)
 664                 return;
 665         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 666                         urb->transfer_buffer, urb->transfer_dma);
 667         usb_free_urb(urb);
 668 }
 669
 670 int zd_usb_enable_rx(struct zd_usb *usb)
 671 {
 672         int i, r;
 673         struct zd_usb_rx *rx = &usb->rx;
 674         struct urb **urbs;
 675
 676         dev_dbg_f(zd_usb_dev(usb), "\n");
 677
 678         r = -ENOMEM;
 679         urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
 680         if (!urbs)
 681                 goto error;
 682         for (i = 0; i < RX_URBS_COUNT; i++) {
 683                 urbs[i] = alloc_rx_urb(usb);
 684                 if (!urbs[i])
 685                         goto error;
 686         }
 687
 688         ZD_ASSERT(!irqs_disabled());
 689         spin_lock_irq(&rx->lock);
 690         if (rx->urbs) {
 691                 spin_unlock_irq(&rx->lock);
 692                 r = 0;
 693                 goto error;
 694         }
 695         rx->urbs = urbs;
 696         rx->urbs_count = RX_URBS_COUNT;
 697         spin_unlock_irq(&rx->lock);
 698
 699         for (i = 0; i < RX_URBS_COUNT; i++) {
 700                 r = usb_submit_urb(urbs[i], GFP_KERNEL);
 701                 if (r)
 702                         goto error_submit;
 703         }
 704
 705         return 0;
 706 error_submit:
 707         for (i = 0; i < RX_URBS_COUNT; i++) {
 708                 usb_kill_urb(urbs[i]);
 709         }
 710         spin_lock_irq(&rx->lock);
 711         rx->urbs = NULL;
 712         rx->urbs_count = 0;
 713         spin_unlock_irq(&rx->lock);
 714 error:
 715         if (urbs) {
 716                 for (i = 0; i < RX_URBS_COUNT; i++)
 717                         free_rx_urb(urbs[i]);
 718         }
 719         return r;
 720 }
 721
 722 void zd_usb_disable_rx(struct zd_usb *usb)
 723 {
 724         int i;
 725         unsigned long flags;
 726         struct urb **urbs;
 727         unsigned int count;
 728         struct zd_usb_rx *rx = &usb->rx;
 729
 730         spin_lock_irqsave(&rx->lock, flags);
 731         urbs = rx->urbs;
 732         count = rx->urbs_count;
 733         spin_unlock_irqrestore(&rx->lock, flags);
 734         if (!urbs)
 735                 return;
 736
 737         for (i = 0; i < count; i++) {
 738                 usb_kill_urb(urbs[i]);
 739                 free_rx_urb(urbs[i]);
 740         }
 741         kfree(urbs);
 742
 743         spin_lock_irqsave(&rx->lock, flags);
 744         rx->urbs = NULL;
 745         rx->urbs_count = 0;
 746         spin_unlock_irqrestore(&rx->lock, flags);
 747 }
 748
 749 /**
 750  * zd_usb_disable_tx - disable transmission
 751  * @usb: the zd1211rw-private USB structure
 752  *
 753  * Frees all URBs in the free list and marks the transmission as disabled.
 754  */
 755 void zd_usb_disable_tx(struct zd_usb *usb)
 756 {
 757         struct zd_usb_tx *tx = &usb->tx;
 758         unsigned long flags;
 759         struct list_head *pos, *n;
 760
 761         spin_lock_irqsave(&tx->lock, flags);
 762         list_for_each_safe(pos, n, &tx->free_urb_list) {
 763                 list_del(pos);
 764                 usb_free_urb(list_entry(pos, struct urb, urb_list));
 765         }
 766         tx->enabled = 0;
 767         tx->submitted_urbs = 0;
 768         /* The stopped state is ignored, relying on ieee80211_wake_queues()
 769          * in a potentionally following zd_usb_enable_tx().
 770          */
 771         spin_unlock_irqrestore(&tx->lock, flags);
 772 }
 773
 774 /**
 775  * zd_usb_enable_tx - enables transmission
 776  * @usb: a &struct zd_usb pointer
 777  *
 778  * This function enables transmission and prepares the &zd_usb_tx data
 779  * structure.
 780  */
 781 void zd_usb_enable_tx(struct zd_usb *usb)
 782 {
 783         unsigned long flags;
 784         struct zd_usb_tx *tx = &usb->tx;
 785
 786         spin_lock_irqsave(&tx->lock, flags);
 787         tx->enabled = 1;
 788         tx->submitted_urbs = 0;
 789         ieee80211_wake_queues(zd_usb_to_hw(usb));
 790         tx->stopped = 0;
 791         spin_unlock_irqrestore(&tx->lock, flags);
 792 }
 793
 794 /**
 795  * alloc_tx_urb - provides an tx URB
 796  * @usb: a &struct zd_usb pointer
 797  *
 798  * Allocates a new URB. If possible takes the urb from the free list in
 799  * usb->tx.
 800  */
 801 static struct urb *alloc_tx_urb(struct zd_usb *usb)
 802 {
 803         struct zd_usb_tx *tx = &usb->tx;
 804         unsigned long flags;
 805         struct list_head *entry;
 806         struct urb *urb;
 807
 808         spin_lock_irqsave(&tx->lock, flags);
 809         if (list_empty(&tx->free_urb_list)) {
 810                 urb = usb_alloc_urb(0, GFP_ATOMIC);
 811                 goto out;
 812         }
 813         entry = tx->free_urb_list.next;
 814         list_del(entry);
 815         urb = list_entry(entry, struct urb, urb_list);
 816 out:
 817         spin_unlock_irqrestore(&tx->lock, flags);
 818         return urb;
 819 }
 820
 821 /**
 822  * free_tx_urb - frees a used tx URB
 823  * @usb: a &struct zd_usb pointer
 824  * @urb: URB to be freed
 825  *
 826  * Frees the the transmission URB, which means to put it on the free URB
 827  * list.
 828  */
 829 static void free_tx_urb(struct zd_usb *usb, struct urb *urb)
 830 {
 831         struct zd_usb_tx *tx = &usb->tx;
 832         unsigned long flags;
 833
 834         spin_lock_irqsave(&tx->lock, flags);
 835         if (!tx->enabled) {
 836                 usb_free_urb(urb);
 837                 goto out;
 838         }
 839         list_add(&urb->urb_list, &tx->free_urb_list);
 840 out:
 841         spin_unlock_irqrestore(&tx->lock, flags);
 842 }
 843
 844 static void tx_dec_submitted_urbs(struct zd_usb *usb)
 845 {
 846         struct zd_usb_tx *tx = &usb->tx;
 847         unsigned long flags;
 848
 849         spin_lock_irqsave(&tx->lock, flags);
 850         --tx->submitted_urbs;
 851         if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) {
 852                 ieee80211_wake_queues(zd_usb_to_hw(usb));
 853                 tx->stopped = 0;
 854         }
 855         spin_unlock_irqrestore(&tx->lock, flags);
 856 }
 857
 858 static void tx_inc_submitted_urbs(struct zd_usb *usb)
 859 {
 860         struct zd_usb_tx *tx = &usb->tx;
 861         unsigned long flags;
 862
 863         spin_lock_irqsave(&tx->lock, flags);
 864         ++tx->submitted_urbs;
 865         if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
 866                 ieee80211_stop_queues(zd_usb_to_hw(usb));
 867                 tx->stopped = 1;
 868         }
 869         spin_unlock_irqrestore(&tx->lock, flags);
 870 }
 871
 872 /**
 873  * tx_urb_complete - completes the execution of an URB
 874  * @urb: a URB
 875  *
 876  * This function is called if the URB has been transferred to a device or an
 877  * error has happened.
 878  */
 879 static void tx_urb_complete(struct urb *urb)
 880 {
 881         int r;
 882         struct sk_buff *skb;
 883         struct ieee80211_tx_info *info;
 884         struct zd_usb *usb;
 885
 886         switch (urb->status) {
 887         case 0:
 888                 break;
 889         case -ESHUTDOWN:
 890         case -EINVAL:
 891         case -ENODEV:
 892         case -ENOENT:
 893         case -ECONNRESET:
 894         case -EPIPE:
 895                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 896                 break;
 897         default:
 898                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 899                 goto resubmit;
 900         }
 901 free_urb:
 902         skb = (struct sk_buff *)urb->context;
 903         /*
 904          * grab 'usb' pointer before handing off the skb (since
 905          * it might be freed by zd_mac_tx_to_dev or mac80211)
 906          */
 907         info = IEEE80211_SKB_CB(skb);
 908         usb = &zd_hw_mac(info->driver_data[0])->chip.usb;
 909         zd_mac_tx_to_dev(skb, urb->status);
 910         free_tx_urb(usb, urb);
 911         tx_dec_submitted_urbs(usb);
 912         return;
 913 resubmit:
 914         r = usb_submit_urb(urb, GFP_ATOMIC);
 915         if (r) {
 916                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 917                 goto free_urb;
 918         }
 919 }
 920
 921 /**
 922  * zd_usb_tx: initiates transfer of a frame of the device
 923  *
 924  * @usb: the zd1211rw-private USB structure
 925  * @skb: a &struct sk_buff pointer
 926  *
 927  * This function tranmits a frame to the device. It doesn't wait for
 928  * completion. The frame must contain the control set and have all the
 929  * control set information available.
 930  *
 931  * The function returns 0 if the transfer has been successfully initiated.
 932  */
 933 int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
 934 {
 935         int r;
 936         struct usb_device *udev = zd_usb_to_usbdev(usb);
 937         struct urb *urb;
 938
 939         urb = alloc_tx_urb(usb);
 940         if (!urb) {
 941                 r = -ENOMEM;
 942                 goto out;
 943         }
 944
 945         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 946                           skb->data, skb->len, tx_urb_complete, skb);
 947
 948         r = usb_submit_urb(urb, GFP_ATOMIC);
 949         if (r)
 950                 goto error;
 951         tx_inc_submitted_urbs(usb);
 952         return 0;
 953 error:
 954         free_tx_urb(usb, urb);
 955 out:
 956         return r;
 957 }
 958
 959 static inline void init_usb_interrupt(struct zd_usb *usb)
 960 {
 961         struct zd_usb_interrupt *intr = &usb->intr;
 962
 963         spin_lock_init(&intr->lock);
 964         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 965         init_completion(&intr->read_regs.completion);
 966         intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
 967 }
 968
 969 static inline void init_usb_rx(struct zd_usb *usb)
 970 {
 971         struct zd_usb_rx *rx = &usb->rx;
 972         spin_lock_init(&rx->lock);
 973         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 974                 rx->usb_packet_size = 512;
 975         } else {
 976                 rx->usb_packet_size = 64;
 977         }
 978         ZD_ASSERT(rx->fragment_length == 0);
 979 }
 980
 981 static inline void init_usb_tx(struct zd_usb *usb)
 982 {
 983         struct zd_usb_tx *tx = &usb->tx;
 984         spin_lock_init(&tx->lock);
 985         tx->enabled = 0;
 986         tx->stopped = 0;
 987         INIT_LIST_HEAD(&tx->free_urb_list);
 988         tx->submitted_urbs = 0;
 989 }
 990
 991 void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
 992                  struct usb_interface *intf)
 993 {
 994         memset(usb, 0, sizeof(*usb));
 995         usb->intf = usb_get_intf(intf);
 996         usb_set_intfdata(usb->intf, hw);
 997         init_usb_interrupt(usb);
 998         init_usb_tx(usb);
 999         init_usb_rx(usb);
1000 }
1001
1002 void zd_usb_clear(struct zd_usb *usb)
1003 {
1004         usb_set_intfdata(usb->intf, NULL);
1005         usb_put_intf(usb->intf);
1006         ZD_MEMCLEAR(usb, sizeof(*usb));
1007         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
1008 }
1009
1010 static const char *speed(enum usb_device_speed speed)
1011 {
1012         switch (speed) {
1013         case USB_SPEED_LOW:
1014                 return "low";
1015         case USB_SPEED_FULL:
1016                 return "full";
1017         case USB_SPEED_HIGH:
1018                 return "high";
1019         default:
1020                 return "unknown speed";
1021         }
1022 }
1023
1024 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
1025 {
1026         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1027                 le16_to_cpu(udev->descriptor.idVendor),
1028                 le16_to_cpu(udev->descriptor.idProduct),
1029                 get_bcdDevice(udev),
1030                 speed(udev->speed));
1031 }
1032
1033 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1034 {
1035         struct usb_device *udev = interface_to_usbdev(usb->intf);
1036         return scnprint_id(udev, buffer, size);
1037 }
1038
1039 #ifdef DEBUG
1040 static void print_id(struct usb_device *udev)
1041 {
1042         char buffer[40];
1043
1044         scnprint_id(udev, buffer, sizeof(buffer));
1045         buffer[sizeof(buffer)-1] = 0;
1046         dev_dbg_f(&udev->dev, "%s\n", buffer);
1047 }
1048 #else
1049 #define print_id(udev) do { } while (0)
1050 #endif
1051
1052 static int eject_installer(struct usb_interface *intf)
1053 {
1054         struct usb_device *udev = interface_to_usbdev(intf);
1055         struct usb_host_interface *iface_desc = &intf->altsetting[0];
1056         struct usb_endpoint_descriptor *endpoint;
1057         unsigned char *cmd;
1058         u8 bulk_out_ep;
1059         int r;
1060
1061         /* Find bulk out endpoint */
1062         endpoint = &iface_desc->endpoint[1].desc;
1063         if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
1064             (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
1065             USB_ENDPOINT_XFER_BULK) {
1066                 bulk_out_ep = endpoint->bEndpointAddress;
1067         } else {
1068                 dev_err(&udev->dev,
1069                         "zd1211rw: Could not find bulk out endpoint\n");
1070                 return -ENODEV;
1071         }
1072
1073         cmd = kzalloc(31, GFP_KERNEL);
1074         if (cmd == NULL)
1075                 return -ENODEV;
1076
1077         /* USB bulk command block */
1078         cmd[0] = 0x55;  /* bulk command signature */
1079         cmd[1] = 0x53;  /* bulk command signature */
1080         cmd[2] = 0x42;  /* bulk command signature */
1081         cmd[3] = 0x43;  /* bulk command signature */
1082         cmd[14] = 6;    /* command length */
1083
1084         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1085         cmd[19] = 0x2;  /* eject disc */
1086
1087         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1088         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1089                 cmd, 31, NULL, 2000);
1090         kfree(cmd);
1091         if (r)
1092                 return r;
1093
1094         /* At this point, the device disconnects and reconnects with the real
1095          * ID numbers. */
1096
1097         usb_set_intfdata(intf, NULL);
1098         return 0;
1099 }
1100
1101 int zd_usb_init_hw(struct zd_usb *usb)
1102 {
1103         int r;
1104         struct zd_mac *mac = zd_usb_to_mac(usb);
1105
1106         dev_dbg_f(zd_usb_dev(usb), "\n");
1107
1108         r = upload_firmware(usb);
1109         if (r) {
1110                 dev_err(zd_usb_dev(usb),
1111                        "couldn't load firmware. Error number %d\n", r);
1112                 return r;
1113         }
1114
1115         r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1116         if (r) {
1117                 dev_dbg_f(zd_usb_dev(usb),
1118                         "couldn't reset configuration. Error number %d\n", r);
1119                 return r;
1120         }
1121
1122         r = zd_mac_init_hw(mac->hw);
1123         if (r) {
1124                 dev_dbg_f(zd_usb_dev(usb),
1125                          "couldn't initialize mac. Error number %d\n", r);
1126                 return r;
1127         }
1128
1129         usb->initialized = 1;
1130         return 0;
1131 }
1132
1133 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1134 {
1135         int r;
1136         struct usb_device *udev = interface_to_usbdev(intf);
1137         struct zd_usb *usb;
1138         struct ieee80211_hw *hw = NULL;
1139
1140         print_id(udev);
1141
1142         if (id->driver_info & DEVICE_INSTALLER)
1143                 return eject_installer(intf);
1144
1145         switch (udev->speed) {
1146         case USB_SPEED_LOW:
1147         case USB_SPEED_FULL:
1148         case USB_SPEED_HIGH:
1149                 break;
1150         default:
1151                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1152                 r = -ENODEV;
1153                 goto error;
1154         }
1155
1156         r = usb_reset_device(udev);
1157         if (r) {
1158                 dev_err(&intf->dev,
1159                         "couldn't reset usb device. Error number %d\n", r);
1160                 goto error;
1161         }
1162
1163         hw = zd_mac_alloc_hw(intf);
1164         if (hw == NULL) {
1165                 r = -ENOMEM;
1166                 goto error;
1167         }
1168
1169         usb = &zd_hw_mac(hw)->chip.usb;
1170         usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1171
1172         r = zd_mac_preinit_hw(hw);
1173         if (r) {
1174                 dev_dbg_f(&intf->dev,
1175                          "couldn't initialize mac. Error number %d\n", r);
1176                 goto error;
1177         }
1178
1179         r = ieee80211_register_hw(hw);
1180         if (r) {
1181                 dev_dbg_f(&intf->dev,
1182                          "couldn't register device. Error number %d\n", r);
1183                 goto error;
1184         }
1185
1186         dev_dbg_f(&intf->dev, "successful\n");
1187         dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
1188         return 0;
1189 error:
1190         usb_reset_device(interface_to_usbdev(intf));
1191         if (hw) {
1192                 zd_mac_clear(zd_hw_mac(hw));
1193                 ieee80211_free_hw(hw);
1194         }
1195         return r;
1196 }
1197
1198 static void disconnect(struct usb_interface *intf)
1199 {
1200         struct ieee80211_hw *hw = zd_intf_to_hw(intf);
1201         struct zd_mac *mac;
1202         struct zd_usb *usb;
1203
1204         /* Either something really bad happened, or we're just dealing with
1205          * a DEVICE_INSTALLER. */
1206         if (hw == NULL)
1207                 return;
1208
1209         mac = zd_hw_mac(hw);
1210         usb = &mac->chip.usb;
1211
1212         dev_dbg_f(zd_usb_dev(usb), "\n");
1213
1214         ieee80211_unregister_hw(hw);
1215
1216         /* Just in case something has gone wrong! */
1217         zd_usb_disable_rx(usb);
1218         zd_usb_disable_int(usb);
1219
1220         /* If the disconnect has been caused by a removal of the
1221          * driver module, the reset allows reloading of the driver. If the
1222          * reset will not be executed here, the upload of the firmware in the
1223          * probe function caused by the reloading of the driver will fail.
1224          */
1225         usb_reset_device(interface_to_usbdev(intf));
1226
1227         zd_mac_clear(mac);
1228         ieee80211_free_hw(hw);
1229         dev_dbg(&intf->dev, "disconnected\n");
1230 }
1231
1232 static struct usb_driver driver = {
1233         .name           = KBUILD_MODNAME,
1234         .id_table       = usb_ids,
1235         .probe          = probe,
1236         .disconnect     = disconnect,
1237 };
1238
1239 struct workqueue_struct *zd_workqueue;
1240
1241 static int __init usb_init(void)
1242 {
1243         int r;
1244
1245         pr_debug("%s usb_init()\n", driver.name);
1246
1247         zd_workqueue = create_singlethread_workqueue(driver.name);
1248         if (zd_workqueue == NULL) {
1249                 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1250                 return -ENOMEM;
1251         }
1252
1253         r = usb_register(&driver);
1254         if (r) {
1255                 destroy_workqueue(zd_workqueue);
1256                 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1257                        driver.name, r);
1258                 return r;
1259         }
1260
1261         pr_debug("%s initialized\n", driver.name);
1262         return 0;
1263 }
1264
1265 static void __exit usb_exit(void)
1266 {
1267         pr_debug("%s usb_exit()\n", driver.name);
1268         usb_deregister(&driver);
1269         destroy_workqueue(zd_workqueue);
1270 }
1271
1272 module_init(usb_init);
1273 module_exit(usb_exit);
1274
1275 static int usb_int_regs_length(unsigned int count)
1276 {
1277         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1278 }
1279
1280 static void prepare_read_regs_int(struct zd_usb *usb)
1281 {
1282         struct zd_usb_interrupt *intr = &usb->intr;
1283
1284         spin_lock_irq(&intr->lock);
1285         intr->read_regs_enabled = 1;
1286         INIT_COMPLETION(intr->read_regs.completion);
1287         spin_unlock_irq(&intr->lock);
1288 }
1289
1290 static void disable_read_regs_int(struct zd_usb *usb)
1291 {
1292         struct zd_usb_interrupt *intr = &usb->intr;
1293
1294         spin_lock_irq(&intr->lock);
1295         intr->read_regs_enabled = 0;
1296         spin_unlock_irq(&intr->lock);
1297 }
1298
1299 static int get_results(struct zd_usb *usb, u16 *values,
1300                        struct usb_req_read_regs *req, unsigned int count)
1301 {
1302         int r;
1303         int i;
1304         struct zd_usb_interrupt *intr = &usb->intr;
1305         struct read_regs_int *rr = &intr->read_regs;
1306         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1307
1308         spin_lock_irq(&intr->lock);
1309
1310         r = -EIO;
1311         /* The created block size seems to be larger than expected.
1312          * However results appear to be correct.
1313          */
1314         if (rr->length < usb_int_regs_length(count)) {
1315                 dev_dbg_f(zd_usb_dev(usb),
1316                          "error: actual length %d less than expected %d\n",
1317                          rr->length, usb_int_regs_length(count));
1318                 goto error_unlock;
1319         }
1320         if (rr->length > sizeof(rr->buffer)) {
1321                 dev_dbg_f(zd_usb_dev(usb),
1322                          "error: actual length %d exceeds buffer size %zu\n",
1323                          rr->length, sizeof(rr->buffer));
1324                 goto error_unlock;
1325         }
1326
1327         for (i = 0; i < count; i++) {
1328                 struct reg_data *rd = &regs->regs[i];
1329                 if (rd->addr != req->addr[i]) {
1330                         dev_dbg_f(zd_usb_dev(usb),
1331                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1332                                  le16_to_cpu(rd->addr),
1333                                  le16_to_cpu(req->addr[i]));
1334                         goto error_unlock;
1335                 }
1336                 values[i] = le16_to_cpu(rd->value);
1337         }
1338
1339         r = 0;
1340 error_unlock:
1341         spin_unlock_irq(&intr->lock);
1342         return r;
1343 }
1344
1345 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1346                      const zd_addr_t *addresses, unsigned int count)
1347 {
1348         int r;
1349         int i, req_len, actual_req_len;
1350         struct usb_device *udev;
1351         struct usb_req_read_regs *req = NULL;
1352         unsigned long timeout;
1353
1354         if (count < 1) {
1355                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1356                 return -EINVAL;
1357         }
1358         if (count > USB_MAX_IOREAD16_COUNT) {
1359                 dev_dbg_f(zd_usb_dev(usb),
1360                          "error: count %u exceeds possible max %u\n",
1361                          count, USB_MAX_IOREAD16_COUNT);
1362                 return -EINVAL;
1363         }
1364         if (in_atomic()) {
1365                 dev_dbg_f(zd_usb_dev(usb),
1366                          "error: io in atomic context not supported\n");
1367                 return -EWOULDBLOCK;
1368         }
1369         if (!usb_int_enabled(usb)) {
1370                  dev_dbg_f(zd_usb_dev(usb),
1371                           "error: usb interrupt not enabled\n");
1372                 return -EWOULDBLOCK;
1373         }
1374
1375         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1376         req = kmalloc(req_len, GFP_KERNEL);
1377         if (!req)
1378                 return -ENOMEM;
1379         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1380         for (i = 0; i < count; i++)
1381                 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1382
1383         udev = zd_usb_to_usbdev(usb);
1384         prepare_read_regs_int(usb);
1385         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1386                          req, req_len, &actual_req_len, 1000 /* ms */);
1387         if (r) {
1388                 dev_dbg_f(zd_usb_dev(usb),
1389                         "error in usb_bulk_msg(). Error number %d\n", r);
1390                 goto error;
1391         }
1392         if (req_len != actual_req_len) {
1393                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1394                         " req_len %d != actual_req_len %d\n",
1395                         req_len, actual_req_len);
1396                 r = -EIO;
1397                 goto error;
1398         }
1399
1400         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1401                                               msecs_to_jiffies(1000));
1402         if (!timeout) {
1403                 disable_read_regs_int(usb);
1404                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1405                 r = -ETIMEDOUT;
1406                 goto error;
1407         }
1408
1409         r = get_results(usb, values, req, count);
1410 error:
1411         kfree(req);
1412         return r;
1413 }
1414
1415 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1416                       unsigned int count)
1417 {
1418         int r;
1419         struct usb_device *udev;
1420         struct usb_req_write_regs *req = NULL;
1421         int i, req_len, actual_req_len;
1422
1423         if (count == 0)
1424                 return 0;
1425         if (count > USB_MAX_IOWRITE16_COUNT) {
1426                 dev_dbg_f(zd_usb_dev(usb),
1427                         "error: count %u exceeds possible max %u\n",
1428                         count, USB_MAX_IOWRITE16_COUNT);
1429                 return -EINVAL;
1430         }
1431         if (in_atomic()) {
1432                 dev_dbg_f(zd_usb_dev(usb),
1433                         "error: io in atomic context not supported\n");
1434                 return -EWOULDBLOCK;
1435         }
1436
1437         req_len = sizeof(struct usb_req_write_regs) +
1438                   count * sizeof(struct reg_data);
1439         req = kmalloc(req_len, GFP_KERNEL);
1440         if (!req)
1441                 return -ENOMEM;
1442
1443         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1444         for (i = 0; i < count; i++) {
1445                 struct reg_data *rw  = &req->reg_writes[i];
1446                 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1447                 rw->value = cpu_to_le16(ioreqs[i].value);
1448         }
1449
1450         udev = zd_usb_to_usbdev(usb);
1451         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1452                          req, req_len, &actual_req_len, 1000 /* ms */);
1453         if (r) {
1454                 dev_dbg_f(zd_usb_dev(usb),
1455                         "error in usb_bulk_msg(). Error number %d\n", r);
1456                 goto error;
1457         }
1458         if (req_len != actual_req_len) {
1459                 dev_dbg_f(zd_usb_dev(usb),
1460                         "error in usb_bulk_msg()"
1461                         " req_len %d != actual_req_len %d\n",
1462                         req_len, actual_req_len);
1463                 r = -EIO;
1464                 goto error;
1465         }
1466
1467         /* FALL-THROUGH with r == 0 */
1468 error:
1469         kfree(req);
1470         return r;
1471 }
1472
1473 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1474 {
1475         int r;
1476         struct usb_device *udev;
1477         struct usb_req_rfwrite *req = NULL;
1478         int i, req_len, actual_req_len;
1479         u16 bit_value_template;
1480
1481         if (in_atomic()) {
1482                 dev_dbg_f(zd_usb_dev(usb),
1483                         "error: io in atomic context not supported\n");
1484                 return -EWOULDBLOCK;
1485         }
1486         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1487                 dev_dbg_f(zd_usb_dev(usb),
1488                         "error: bits %d are smaller than"
1489                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1490                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1491                 return -EINVAL;
1492         }
1493         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1494                 dev_dbg_f(zd_usb_dev(usb),
1495                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1496                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1497                 return -EINVAL;
1498         }
1499 #ifdef DEBUG
1500         if (value & (~0UL << bits)) {
1501                 dev_dbg_f(zd_usb_dev(usb),
1502                         "error: value %#09x has bits >= %d set\n",
1503                         value, bits);
1504                 return -EINVAL;
1505         }
1506 #endif /* DEBUG */
1507
1508         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1509
1510         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1511         if (r) {
1512                 dev_dbg_f(zd_usb_dev(usb),
1513                         "error %d: Couldn't read CR203\n", r);
1514                 goto out;
1515         }
1516         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1517
1518         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1519         req = kmalloc(req_len, GFP_KERNEL);
1520         if (!req)
1521                 return -ENOMEM;
1522
1523         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1524         /* 1: 3683a, but not used in ZYDAS driver */
1525         req->value = cpu_to_le16(2);
1526         req->bits = cpu_to_le16(bits);
1527
1528         for (i = 0; i < bits; i++) {
1529                 u16 bv = bit_value_template;
1530                 if (value & (1 << (bits-1-i)))
1531                         bv |= RF_DATA;
1532                 req->bit_values[i] = cpu_to_le16(bv);
1533         }
1534
1535         udev = zd_usb_to_usbdev(usb);
1536         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1537                          req, req_len, &actual_req_len, 1000 /* ms */);
1538         if (r) {
1539                 dev_dbg_f(zd_usb_dev(usb),
1540                         "error in usb_bulk_msg(). Error number %d\n", r);
1541                 goto out;
1542         }
1543         if (req_len != actual_req_len) {
1544                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1545                         " req_len %d != actual_req_len %d\n",
1546                         req_len, actual_req_len);
1547                 r = -EIO;
1548                 goto out;
1549         }
1550
1551         /* FALL-THROUGH with r == 0 */
1552 out:
1553         kfree(req);
1554         return r;
1555 }