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