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