drivers/net/wireless/zydas/zd1211rw/zd_usb.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* ZD1211 USB-WLAN driver for Linux
   3  *
   4  * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
   5  * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
   6  * Copyright (C) 2006-2007 Michael Wu <flamingice@sourmilk.net>
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/firmware.h>
  12 #include <linux/device.h>
  13 #include <linux/errno.h>
  14 #include <linux/slab.h>
  15 #include <linux/skbuff.h>
  16 #include <linux/usb.h>
  17 #include <linux/workqueue.h>
  18 #include <linux/module.h>
  19 #include <net/mac80211.h>
  20 #include <asm/unaligned.h>
  21
  22 #include "zd_def.h"
  23 #include "zd_mac.h"
  24 #include "zd_usb.h"
  25
  26 static const struct usb_device_id usb_ids[] = {
  27         /* ZD1211 */
  28         { USB_DEVICE(0x0105, 0x145f), .driver_info = DEVICE_ZD1211 },
  29         { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
  30         { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
  31         { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
  32         { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
  33         { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
  34         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
  35         { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
  36         { USB_DEVICE(0x0ace, 0xa211), .driver_info = DEVICE_ZD1211 },
  37         { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
  38         { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
  39         { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
  40         { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
  41         { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
  42         { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
  43         { USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 },
  44         { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
  45         { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
  46         { USB_DEVICE(0x14ea, 0xab10), .driver_info = DEVICE_ZD1211 },
  47         { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
  48         { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 },
  49         { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
  50         { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
  51         { USB_DEVICE(0x157e, 0x3207), .driver_info = DEVICE_ZD1211 },
  52         { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
  53         { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
  54         /* ZD1211B */
  55         { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
  56         { USB_DEVICE(0x0409, 0x0248), .driver_info = DEVICE_ZD1211B },
  57         { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
  58         { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
  59         { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
  60         { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
  61         { USB_DEVICE(0x054c, 0x0257), .driver_info = DEVICE_ZD1211B },
  62         { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
  63         { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
  64         { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
  65         { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
  66         { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
  67         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  68         { USB_DEVICE(0x07fa, 0x1196), .driver_info = DEVICE_ZD1211B },
  69         { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
  70         { USB_DEVICE(0x083a, 0xe501), .driver_info = DEVICE_ZD1211B },
  71         { USB_DEVICE(0x083a, 0xe503), .driver_info = DEVICE_ZD1211B },
  72         { USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B },
  73         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  74         { USB_DEVICE(0x0ace, 0xb215), .driver_info = DEVICE_ZD1211B },
  75         { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
  76         { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
  77         { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
  78         { USB_DEVICE(0x0df6, 0x0036), .driver_info = DEVICE_ZD1211B },
  79         { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
  80         { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
  81         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  82         { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
  83         { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
  84         { USB_DEVICE(0x2019, 0xed01), .driver_info = DEVICE_ZD1211B },
  85         /* "Driverless" devices that need ejecting */
  86         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
  87         { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
  88         {}
  89 };
  90
  91 MODULE_LICENSE("GPL");
  92 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
  93 MODULE_AUTHOR("Ulrich Kunitz");
  94 MODULE_AUTHOR("Daniel Drake");
  95 MODULE_VERSION("1.0");
  96 MODULE_DEVICE_TABLE(usb, usb_ids);
  97
  98 #define FW_ZD1211_PREFIX        "/*(DEBLOBBED)*/"
  99 #define FW_ZD1211B_PREFIX       "/*(DEBLOBBED)*/"
 100
 101 static bool check_read_regs(struct zd_usb *usb, struct usb_req_read_regs *req,
 102                             unsigned int count);
 103
 104 /* USB device initialization */
 105 static void int_urb_complete(struct urb *urb);
 106
 107 static int request_fw_file(
 108         const struct firmware **fw, const char *name, struct device *device)
 109 {
 110         int r;
 111
 112         dev_dbg_f(device, "fw name %s\n", name);
 113
 114         r = reject_firmware(fw, name, device);
 115         if (r)
 116                 dev_err(device,
 117                        "Could not load firmware file %s. Error number %d\n",
 118                        name, r);
 119         return r;
 120 }
 121
 122 static inline u16 get_bcdDevice(const struct usb_device *udev)
 123 {
 124         return le16_to_cpu(udev->descriptor.bcdDevice);
 125 }
 126
 127 enum upload_code_flags {
 128         REBOOT = 1,
 129 };
 130
 131 /* Ensures that MAX_TRANSFER_SIZE is even. */
 132 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 133
 134 static int upload_code(struct usb_device *udev,
 135         const u8 *data, size_t size, u16 code_offset, int flags)
 136 {
 137         u8 *p;
 138         int r;
 139
 140         /* USB request blocks need "kmalloced" buffers.
 141          */
 142         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 143         if (!p) {
 144                 r = -ENOMEM;
 145                 goto error;
 146         }
 147
 148         size &= ~1;
 149         while (size > 0) {
 150                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 151                         size : MAX_TRANSFER_SIZE;
 152
 153                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 154
 155                 memcpy(p, data, transfer_size);
 156                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 157                         USB_REQ_FIRMWARE_DOWNLOAD,
 158                         USB_DIR_OUT | USB_TYPE_VENDOR,
 159                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 160                 if (r < 0) {
 161                         dev_err(&udev->dev,
 162                                "USB control request for firmware upload"
 163                                " failed. Error number %d\n", r);
 164                         goto error;
 165                 }
 166                 transfer_size = r & ~1;
 167
 168                 size -= transfer_size;
 169                 data += transfer_size;
 170                 code_offset += transfer_size/sizeof(u16);
 171         }
 172
 173         if (flags & REBOOT) {
 174                 u8 ret;
 175
 176                 /* Use "DMA-aware" buffer. */
 177                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 178                         USB_REQ_FIRMWARE_CONFIRM,
 179                         USB_DIR_IN | USB_TYPE_VENDOR,
 180                         0, 0, p, sizeof(ret), 5000 /* ms */);
 181                 if (r != sizeof(ret)) {
 182                         dev_err(&udev->dev,
 183                                 "control request firmware confirmation failed."
 184                                 " Return value %d\n", r);
 185                         if (r >= 0)
 186                                 r = -ENODEV;
 187                         goto error;
 188                 }
 189                 ret = p[0];
 190                 if (ret & 0x80) {
 191                         dev_err(&udev->dev,
 192                                 "Internal error while downloading."
 193                                 " Firmware confirm return value %#04x\n",
 194                                 (unsigned int)ret);
 195                         r = -ENODEV;
 196                         goto error;
 197                 }
 198                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 199                         (unsigned int)ret);
 200         }
 201
 202         r = 0;
 203 error:
 204         kfree(p);
 205         return r;
 206 }
 207
 208 static u16 get_word(const void *data, u16 offset)
 209 {
 210         const __le16 *p = data;
 211         return le16_to_cpu(p[offset]);
 212 }
 213
 214 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
 215                        const char* postfix)
 216 {
 217         scnprintf(buffer, size, "%s%s",
 218                 usb->is_zd1211b ?
 219                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 220                 postfix);
 221         return buffer;
 222 }
 223
 224 static int handle_version_mismatch(struct zd_usb *usb,
 225         const struct firmware *ub_fw)
 226 {
 227         struct usb_device *udev = zd_usb_to_usbdev(usb);
 228         const struct firmware *ur_fw = NULL;
 229         int offset;
 230         int r = 0;
 231         char fw_name[128];
 232
 233         r = request_fw_file(&ur_fw,
 234                 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
 235                 &udev->dev);
 236         if (r)
 237                 goto error;
 238
 239         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
 240         if (r)
 241                 goto error;
 242
 243         offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
 244         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
 245                 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
 246
 247         /* At this point, the vendor driver downloads the whole firmware
 248          * image, hacks around with version IDs, and uploads it again,
 249          * completely overwriting the boot code. We do not do this here as
 250          * it is not required on any tested devices, and it is suspected to
 251          * cause problems. */
 252 error:
 253         release_firmware(ur_fw);
 254         return r;
 255 }
 256
 257 static int upload_firmware(struct zd_usb *usb)
 258 {
 259         int r;
 260         u16 fw_bcdDevice;
 261         u16 bcdDevice;
 262         struct usb_device *udev = zd_usb_to_usbdev(usb);
 263         const struct firmware *ub_fw = NULL;
 264         const struct firmware *uph_fw = NULL;
 265         char fw_name[128];
 266
 267         bcdDevice = get_bcdDevice(udev);
 268
 269         r = request_fw_file(&ub_fw,
 270                 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
 271                 &udev->dev);
 272         if (r)
 273                 goto error;
 274
 275         fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
 276
 277         if (fw_bcdDevice != bcdDevice) {
 278                 dev_info(&udev->dev,
 279                         "firmware version %#06x and device bootcode version "
 280                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
 281                 if (bcdDevice <= 0x4313)
 282                         dev_warn(&udev->dev, "device has old bootcode, please "
 283                                 "report success or failure\n");
 284
 285                 r = handle_version_mismatch(usb, ub_fw);
 286                 if (r)
 287                         goto error;
 288         } else {
 289                 dev_dbg_f(&udev->dev,
 290                         "firmware device id %#06x is equal to the "
 291                         "actual device id\n", fw_bcdDevice);
 292         }
 293
 294
 295         r = request_fw_file(&uph_fw,
 296                 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
 297                 &udev->dev);
 298         if (r)
 299                 goto error;
 300
 301         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
 302         if (r) {
 303                 dev_err(&udev->dev,
 304                         "Could not upload firmware code uph. Error number %d\n",
 305                         r);
 306         }
 307
 308         /* FALL-THROUGH */
 309 error:
 310         release_firmware(ub_fw);
 311         release_firmware(uph_fw);
 312         return r;
 313 }
 314
 315 /*(DEBLOBBED)*/
 316
 317 /* Read data from device address space using "firmware interface" which does
 318  * not require firmware to be loaded. */
 319 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
 320 {
 321         int r;
 322         struct usb_device *udev = zd_usb_to_usbdev(usb);
 323         u8 *buf;
 324
 325         /* Use "DMA-aware" buffer. */
 326         buf = kmalloc(len, GFP_KERNEL);
 327         if (!buf)
 328                 return -ENOMEM;
 329         r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 330                 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
 331                 buf, len, 5000);
 332         if (r < 0) {
 333                 dev_err(&udev->dev,
 334                         "read over firmware interface failed: %d\n", r);
 335                 goto exit;
 336         } else if (r != len) {
 337                 dev_err(&udev->dev,
 338                         "incomplete read over firmware interface: %d/%d\n",
 339                         r, len);
 340                 r = -EIO;
 341                 goto exit;
 342         }
 343         r = 0;
 344         memcpy(data, buf, len);
 345 exit:
 346         kfree(buf);
 347         return r;
 348 }
 349
 350 #define urb_dev(urb) (&(urb)->dev->dev)
 351
 352 static inline void handle_regs_int_override(struct urb *urb)
 353 {
 354         struct zd_usb *usb = urb->context;
 355         struct zd_usb_interrupt *intr = &usb->intr;
 356         unsigned long flags;
 357
 358         spin_lock_irqsave(&intr->lock, flags);
 359         if (atomic_read(&intr->read_regs_enabled)) {
 360                 atomic_set(&intr->read_regs_enabled, 0);
 361                 intr->read_regs_int_overridden = 1;
 362                 complete(&intr->read_regs.completion);
 363         }
 364         spin_unlock_irqrestore(&intr->lock, flags);
 365 }
 366
 367 static inline void handle_regs_int(struct urb *urb)
 368 {
 369         struct zd_usb *usb = urb->context;
 370         struct zd_usb_interrupt *intr = &usb->intr;
 371         unsigned long flags;
 372         int len;
 373         u16 int_num;
 374
 375         spin_lock_irqsave(&intr->lock, flags);
 376
 377         int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));
 378         if (int_num == CR_INTERRUPT) {
 379                 struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
 380                 spin_lock(&mac->lock);
 381                 memcpy(&mac->intr_buffer, urb->transfer_buffer,
 382                                 USB_MAX_EP_INT_BUFFER);
 383                 spin_unlock(&mac->lock);
 384                 schedule_work(&mac->process_intr);
 385         } else if (atomic_read(&intr->read_regs_enabled)) {
 386                 len = urb->actual_length;
 387                 intr->read_regs.length = urb->actual_length;
 388                 if (len > sizeof(intr->read_regs.buffer))
 389                         len = sizeof(intr->read_regs.buffer);
 390
 391                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 392
 393                 /* Sometimes USB_INT_ID_REGS is not overridden, but comes after
 394                  * USB_INT_ID_RETRY_FAILED. Read-reg retry then gets this
 395                  * delayed USB_INT_ID_REGS, but leaves USB_INT_ID_REGS of
 396                  * retry unhandled. Next read-reg command then might catch
 397                  * this wrong USB_INT_ID_REGS. Fix by ignoring wrong reads.
 398                  */
 399                 if (!check_read_regs(usb, intr->read_regs.req,
 400                                                 intr->read_regs.req_count))
 401                         goto out;
 402
 403                 atomic_set(&intr->read_regs_enabled, 0);
 404                 intr->read_regs_int_overridden = 0;
 405                 complete(&intr->read_regs.completion);
 406
 407                 goto out;
 408         }
 409
 410 out:
 411         spin_unlock_irqrestore(&intr->lock, flags);
 412
 413         /* CR_INTERRUPT might override read_reg too. */
 414         if (int_num == CR_INTERRUPT && atomic_read(&intr->read_regs_enabled))
 415                 handle_regs_int_override(urb);
 416 }
 417
 418 static void int_urb_complete(struct urb *urb)
 419 {
 420         int r;
 421         struct usb_int_header *hdr;
 422         struct zd_usb *usb;
 423         struct zd_usb_interrupt *intr;
 424
 425         switch (urb->status) {
 426         case 0:
 427                 break;
 428         case -ESHUTDOWN:
 429         case -EINVAL:
 430         case -ENODEV:
 431         case -ENOENT:
 432         case -ECONNRESET:
 433         case -EPIPE:
 434                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 435                 return;
 436         default:
 437                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 438                 goto resubmit;
 439         }
 440
 441         if (urb->actual_length < sizeof(hdr)) {
 442                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 443                 goto resubmit;
 444         }
 445
 446         hdr = urb->transfer_buffer;
 447         if (hdr->type != USB_INT_TYPE) {
 448                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 449                 goto resubmit;
 450         }
 451
 452         /* USB_INT_ID_RETRY_FAILED triggered by tx-urb submit can override
 453          * pending USB_INT_ID_REGS causing read command timeout.
 454          */
 455         usb = urb->context;
 456         intr = &usb->intr;
 457         if (hdr->id != USB_INT_ID_REGS && atomic_read(&intr->read_regs_enabled))
 458                 handle_regs_int_override(urb);
 459
 460         switch (hdr->id) {
 461         case USB_INT_ID_REGS:
 462                 handle_regs_int(urb);
 463                 break;
 464         case USB_INT_ID_RETRY_FAILED:
 465                 zd_mac_tx_failed(urb);
 466                 break;
 467         default:
 468                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 469                         (unsigned int)hdr->id);
 470                 goto resubmit;
 471         }
 472
 473 resubmit:
 474         r = usb_submit_urb(urb, GFP_ATOMIC);
 475         if (r) {
 476                 dev_dbg_f(urb_dev(urb), "error: resubmit urb %p err code %d\n",
 477                           urb, r);
 478                 /* TODO: add worker to reset intr->urb */
 479         }
 480         return;
 481 }
 482
 483 static inline int int_urb_interval(struct usb_device *udev)
 484 {
 485         switch (udev->speed) {
 486         case USB_SPEED_HIGH:
 487                 return 4;
 488         case USB_SPEED_LOW:
 489                 return 10;
 490         case USB_SPEED_FULL:
 491         default:
 492                 return 1;
 493         }
 494 }
 495
 496 static inline int usb_int_enabled(struct zd_usb *usb)
 497 {
 498         unsigned long flags;
 499         struct zd_usb_interrupt *intr = &usb->intr;
 500         struct urb *urb;
 501
 502         spin_lock_irqsave(&intr->lock, flags);
 503         urb = intr->urb;
 504         spin_unlock_irqrestore(&intr->lock, flags);
 505         return urb != NULL;
 506 }
 507
 508 int zd_usb_enable_int(struct zd_usb *usb)
 509 {
 510         int r;
 511         struct usb_device *udev = zd_usb_to_usbdev(usb);
 512         struct zd_usb_interrupt *intr = &usb->intr;
 513         struct urb *urb;
 514
 515         dev_dbg_f(zd_usb_dev(usb), "\n");
 516
 517         urb = usb_alloc_urb(0, GFP_KERNEL);
 518         if (!urb) {
 519                 r = -ENOMEM;
 520                 goto out;
 521         }
 522
 523         ZD_ASSERT(!irqs_disabled());
 524         spin_lock_irq(&intr->lock);
 525         if (intr->urb) {
 526                 spin_unlock_irq(&intr->lock);
 527                 r = 0;
 528                 goto error_free_urb;
 529         }
 530         intr->urb = urb;
 531         spin_unlock_irq(&intr->lock);
 532
 533         r = -ENOMEM;
 534         intr->buffer = usb_alloc_coherent(udev, USB_MAX_EP_INT_BUFFER,
 535                                           GFP_KERNEL, &intr->buffer_dma);
 536         if (!intr->buffer) {
 537                 dev_dbg_f(zd_usb_dev(usb),
 538                         "couldn't allocate transfer_buffer\n");
 539                 goto error_set_urb_null;
 540         }
 541
 542         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 543                          intr->buffer, USB_MAX_EP_INT_BUFFER,
 544                          int_urb_complete, usb,
 545                          intr->interval);
 546         urb->transfer_dma = intr->buffer_dma;
 547         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 548
 549         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 550         r = usb_submit_urb(urb, GFP_KERNEL);
 551         if (r) {
 552                 dev_dbg_f(zd_usb_dev(usb),
 553                          "Couldn't submit urb. Error number %d\n", r);
 554                 goto error;
 555         }
 556
 557         return 0;
 558 error:
 559         usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER,
 560                           intr->buffer, intr->buffer_dma);
 561 error_set_urb_null:
 562         spin_lock_irq(&intr->lock);
 563         intr->urb = NULL;
 564         spin_unlock_irq(&intr->lock);
 565 error_free_urb:
 566         usb_free_urb(urb);
 567 out:
 568         return r;
 569 }
 570
 571 void zd_usb_disable_int(struct zd_usb *usb)
 572 {
 573         unsigned long flags;
 574         struct usb_device *udev = zd_usb_to_usbdev(usb);
 575         struct zd_usb_interrupt *intr = &usb->intr;
 576         struct urb *urb;
 577         void *buffer;
 578         dma_addr_t buffer_dma;
 579
 580         spin_lock_irqsave(&intr->lock, flags);
 581         urb = intr->urb;
 582         if (!urb) {
 583                 spin_unlock_irqrestore(&intr->lock, flags);
 584                 return;
 585         }
 586         intr->urb = NULL;
 587         buffer = intr->buffer;
 588         buffer_dma = intr->buffer_dma;
 589         intr->buffer = NULL;
 590         spin_unlock_irqrestore(&intr->lock, flags);
 591
 592         usb_kill_urb(urb);
 593         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 594         usb_free_urb(urb);
 595
 596         usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER, buffer, buffer_dma);
 597 }
 598
 599 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 600                              unsigned int length)
 601 {
 602         int i;
 603         const struct rx_length_info *length_info;
 604
 605         if (length < sizeof(struct rx_length_info)) {
 606                 /* It's not a complete packet anyhow. */
 607                 dev_dbg_f(zd_usb_dev(usb), "invalid, small RX packet : %d\n",
 608                                            length);
 609                 return;
 610         }
 611         length_info = (struct rx_length_info *)
 612                 (buffer + length - sizeof(struct rx_length_info));
 613
 614         /* It might be that three frames are merged into a single URB
 615          * transaction. We have to check for the length info tag.
 616          *
 617          * While testing we discovered that length_info might be unaligned,
 618          * because if USB transactions are merged, the last packet will not
 619          * be padded. Unaligned access might also happen if the length_info
 620          * structure is not present.
 621          */
 622         if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG)
 623         {
 624                 unsigned int l, k, n;
 625                 for (i = 0, l = 0;; i++) {
 626                         k = get_unaligned_le16(&length_info->length[i]);
 627                         if (k == 0)
 628                                 return;
 629                         n = l+k;
 630                         if (n > length)
 631                                 return;
 632                         zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
 633                         if (i >= 2)
 634                                 return;
 635                         l = (n+3) & ~3;
 636                 }
 637         } else {
 638                 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
 639         }
 640 }
 641
 642 static void rx_urb_complete(struct urb *urb)
 643 {
 644         int r;
 645         struct zd_usb *usb;
 646         struct zd_usb_rx *rx;
 647         const u8 *buffer;
 648         unsigned int length;
 649         unsigned long flags;
 650
 651         switch (urb->status) {
 652         case 0:
 653                 break;
 654         case -ESHUTDOWN:
 655         case -EINVAL:
 656         case -ENODEV:
 657         case -ENOENT:
 658         case -ECONNRESET:
 659         case -EPIPE:
 660                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 661                 return;
 662         default:
 663                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 664                 goto resubmit;
 665         }
 666
 667         buffer = urb->transfer_buffer;
 668         length = urb->actual_length;
 669         usb = urb->context;
 670         rx = &usb->rx;
 671
 672         tasklet_schedule(&rx->reset_timer_tasklet);
 673
 674         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 675                 /* If there is an old first fragment, we don't care. */
 676                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 677                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 678                 spin_lock_irqsave(&rx->lock, flags);
 679                 memcpy(rx->fragment, buffer, length);
 680                 rx->fragment_length = length;
 681                 spin_unlock_irqrestore(&rx->lock, flags);
 682                 goto resubmit;
 683         }
 684
 685         spin_lock_irqsave(&rx->lock, flags);
 686         if (rx->fragment_length > 0) {
 687                 /* We are on a second fragment, we believe */
 688                 ZD_ASSERT(length + rx->fragment_length <=
 689                           ARRAY_SIZE(rx->fragment));
 690                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 691                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 692                 handle_rx_packet(usb, rx->fragment,
 693                                  rx->fragment_length + length);
 694                 rx->fragment_length = 0;
 695                 spin_unlock_irqrestore(&rx->lock, flags);
 696         } else {
 697                 spin_unlock_irqrestore(&rx->lock, flags);
 698                 handle_rx_packet(usb, buffer, length);
 699         }
 700
 701 resubmit:
 702         r = usb_submit_urb(urb, GFP_ATOMIC);
 703         if (r)
 704                 dev_dbg_f(urb_dev(urb), "urb %p resubmit error %d\n", urb, r);
 705 }
 706
 707 static struct urb *alloc_rx_urb(struct zd_usb *usb)
 708 {
 709         struct usb_device *udev = zd_usb_to_usbdev(usb);
 710         struct urb *urb;
 711         void *buffer;
 712
 713         urb = usb_alloc_urb(0, GFP_KERNEL);
 714         if (!urb)
 715                 return NULL;
 716         buffer = usb_alloc_coherent(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
 717                                     &urb->transfer_dma);
 718         if (!buffer) {
 719                 usb_free_urb(urb);
 720                 return NULL;
 721         }
 722
 723         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 724                           buffer, USB_MAX_RX_SIZE,
 725                           rx_urb_complete, usb);
 726         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 727
 728         return urb;
 729 }
 730
 731 static void free_rx_urb(struct urb *urb)
 732 {
 733         if (!urb)
 734                 return;
 735         usb_free_coherent(urb->dev, urb->transfer_buffer_length,
 736                           urb->transfer_buffer, urb->transfer_dma);
 737         usb_free_urb(urb);
 738 }
 739
 740 static int __zd_usb_enable_rx(struct zd_usb *usb)
 741 {
 742         int i, r;
 743         struct zd_usb_rx *rx = &usb->rx;
 744         struct urb **urbs;
 745
 746         dev_dbg_f(zd_usb_dev(usb), "\n");
 747
 748         r = -ENOMEM;
 749         urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
 750         if (!urbs)
 751                 goto error;
 752         for (i = 0; i < RX_URBS_COUNT; i++) {
 753                 urbs[i] = alloc_rx_urb(usb);
 754                 if (!urbs[i])
 755                         goto error;
 756         }
 757
 758         ZD_ASSERT(!irqs_disabled());
 759         spin_lock_irq(&rx->lock);
 760         if (rx->urbs) {
 761                 spin_unlock_irq(&rx->lock);
 762                 r = 0;
 763                 goto error;
 764         }
 765         rx->urbs = urbs;
 766         rx->urbs_count = RX_URBS_COUNT;
 767         spin_unlock_irq(&rx->lock);
 768
 769         for (i = 0; i < RX_URBS_COUNT; i++) {
 770                 r = usb_submit_urb(urbs[i], GFP_KERNEL);
 771                 if (r)
 772                         goto error_submit;
 773         }
 774
 775         return 0;
 776 error_submit:
 777         for (i = 0; i < RX_URBS_COUNT; i++) {
 778                 usb_kill_urb(urbs[i]);
 779         }
 780         spin_lock_irq(&rx->lock);
 781         rx->urbs = NULL;
 782         rx->urbs_count = 0;
 783         spin_unlock_irq(&rx->lock);
 784 error:
 785         if (urbs) {
 786                 for (i = 0; i < RX_URBS_COUNT; i++)
 787                         free_rx_urb(urbs[i]);
 788         }
 789         return r;
 790 }
 791
 792 int zd_usb_enable_rx(struct zd_usb *usb)
 793 {
 794         int r;
 795         struct zd_usb_rx *rx = &usb->rx;
 796
 797         mutex_lock(&rx->setup_mutex);
 798         r = __zd_usb_enable_rx(usb);
 799         mutex_unlock(&rx->setup_mutex);
 800
 801         zd_usb_reset_rx_idle_timer(usb);
 802
 803         return r;
 804 }
 805
 806 static void __zd_usb_disable_rx(struct zd_usb *usb)
 807 {
 808         int i;
 809         unsigned long flags;
 810         struct urb **urbs;
 811         unsigned int count;
 812         struct zd_usb_rx *rx = &usb->rx;
 813
 814         spin_lock_irqsave(&rx->lock, flags);
 815         urbs = rx->urbs;
 816         count = rx->urbs_count;
 817         spin_unlock_irqrestore(&rx->lock, flags);
 818         if (!urbs)
 819                 return;
 820
 821         for (i = 0; i < count; i++) {
 822                 usb_kill_urb(urbs[i]);
 823                 free_rx_urb(urbs[i]);
 824         }
 825         kfree(urbs);
 826
 827         spin_lock_irqsave(&rx->lock, flags);
 828         rx->urbs = NULL;
 829         rx->urbs_count = 0;
 830         spin_unlock_irqrestore(&rx->lock, flags);
 831 }
 832
 833 void zd_usb_disable_rx(struct zd_usb *usb)
 834 {
 835         struct zd_usb_rx *rx = &usb->rx;
 836
 837         mutex_lock(&rx->setup_mutex);
 838         __zd_usb_disable_rx(usb);
 839         mutex_unlock(&rx->setup_mutex);
 840
 841         tasklet_kill(&rx->reset_timer_tasklet);
 842         cancel_delayed_work_sync(&rx->idle_work);
 843 }
 844
 845 static void zd_usb_reset_rx(struct zd_usb *usb)
 846 {
 847         bool do_reset;
 848         struct zd_usb_rx *rx = &usb->rx;
 849         unsigned long flags;
 850
 851         mutex_lock(&rx->setup_mutex);
 852
 853         spin_lock_irqsave(&rx->lock, flags);
 854         do_reset = rx->urbs != NULL;
 855         spin_unlock_irqrestore(&rx->lock, flags);
 856
 857         if (do_reset) {
 858                 __zd_usb_disable_rx(usb);
 859                 __zd_usb_enable_rx(usb);
 860         }
 861
 862         mutex_unlock(&rx->setup_mutex);
 863
 864         if (do_reset)
 865                 zd_usb_reset_rx_idle_timer(usb);
 866 }
 867
 868 /**
 869  * zd_usb_disable_tx - disable transmission
 870  * @usb: the zd1211rw-private USB structure
 871  *
 872  * Frees all URBs in the free list and marks the transmission as disabled.
 873  */
 874 void zd_usb_disable_tx(struct zd_usb *usb)
 875 {
 876         struct zd_usb_tx *tx = &usb->tx;
 877         unsigned long flags;
 878
 879         atomic_set(&tx->enabled, 0);
 880
 881         /* kill all submitted tx-urbs */
 882         usb_kill_anchored_urbs(&tx->submitted);
 883
 884         spin_lock_irqsave(&tx->lock, flags);
 885         WARN_ON(!skb_queue_empty(&tx->submitted_skbs));
 886         WARN_ON(tx->submitted_urbs != 0);
 887         tx->submitted_urbs = 0;
 888         spin_unlock_irqrestore(&tx->lock, flags);
 889
 890         /* The stopped state is ignored, relying on ieee80211_wake_queues()
 891          * in a potentionally following zd_usb_enable_tx().
 892          */
 893 }
 894
 895 /**
 896  * zd_usb_enable_tx - enables transmission
 897  * @usb: a &struct zd_usb pointer
 898  *
 899  * This function enables transmission and prepares the &zd_usb_tx data
 900  * structure.
 901  */
 902 void zd_usb_enable_tx(struct zd_usb *usb)
 903 {
 904         unsigned long flags;
 905         struct zd_usb_tx *tx = &usb->tx;
 906
 907         spin_lock_irqsave(&tx->lock, flags);
 908         atomic_set(&tx->enabled, 1);
 909         tx->submitted_urbs = 0;
 910         ieee80211_wake_queues(zd_usb_to_hw(usb));
 911         tx->stopped = 0;
 912         spin_unlock_irqrestore(&tx->lock, flags);
 913 }
 914
 915 static void tx_dec_submitted_urbs(struct zd_usb *usb)
 916 {
 917         struct zd_usb_tx *tx = &usb->tx;
 918         unsigned long flags;
 919
 920         spin_lock_irqsave(&tx->lock, flags);
 921         --tx->submitted_urbs;
 922         if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) {
 923                 ieee80211_wake_queues(zd_usb_to_hw(usb));
 924                 tx->stopped = 0;
 925         }
 926         spin_unlock_irqrestore(&tx->lock, flags);
 927 }
 928
 929 static void tx_inc_submitted_urbs(struct zd_usb *usb)
 930 {
 931         struct zd_usb_tx *tx = &usb->tx;
 932         unsigned long flags;
 933
 934         spin_lock_irqsave(&tx->lock, flags);
 935         ++tx->submitted_urbs;
 936         if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
 937                 ieee80211_stop_queues(zd_usb_to_hw(usb));
 938                 tx->stopped = 1;
 939         }
 940         spin_unlock_irqrestore(&tx->lock, flags);
 941 }
 942
 943 /**
 944  * tx_urb_complete - completes the execution of an URB
 945  * @urb: a URB
 946  *
 947  * This function is called if the URB has been transferred to a device or an
 948  * error has happened.
 949  */
 950 static void tx_urb_complete(struct urb *urb)
 951 {
 952         int r;
 953         struct sk_buff *skb;
 954         struct ieee80211_tx_info *info;
 955         struct zd_usb *usb;
 956         struct zd_usb_tx *tx;
 957
 958         skb = (struct sk_buff *)urb->context;
 959         info = IEEE80211_SKB_CB(skb);
 960         /*
 961          * grab 'usb' pointer before handing off the skb (since
 962          * it might be freed by zd_mac_tx_to_dev or mac80211)
 963          */
 964         usb = &zd_hw_mac(info->rate_driver_data[0])->chip.usb;
 965         tx = &usb->tx;
 966
 967         switch (urb->status) {
 968         case 0:
 969                 break;
 970         case -ESHUTDOWN:
 971         case -EINVAL:
 972         case -ENODEV:
 973         case -ENOENT:
 974         case -ECONNRESET:
 975         case -EPIPE:
 976                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 977                 break;
 978         default:
 979                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 980                 goto resubmit;
 981         }
 982 free_urb:
 983         skb_unlink(skb, &usb->tx.submitted_skbs);
 984         zd_mac_tx_to_dev(skb, urb->status);
 985         usb_free_urb(urb);
 986         tx_dec_submitted_urbs(usb);
 987         return;
 988 resubmit:
 989         usb_anchor_urb(urb, &tx->submitted);
 990         r = usb_submit_urb(urb, GFP_ATOMIC);
 991         if (r) {
 992                 usb_unanchor_urb(urb);
 993                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 994                 goto free_urb;
 995         }
 996 }
 997
 998 /**
 999  * zd_usb_tx: initiates transfer of a frame of the device
1000  *
1001  * @usb: the zd1211rw-private USB structure
1002  * @skb: a &struct sk_buff pointer
1003  *
1004  * This function transmits a frame to the device. It doesn't wait for
1005  * completion. The frame must contain the control set and have all the
1006  * control set information available.
1007  *
1008  * The function returns 0 if the transfer has been successfully initiated.
1009  */
1010 int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
1011 {
1012         int r;
1013         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1014         struct usb_device *udev = zd_usb_to_usbdev(usb);
1015         struct urb *urb;
1016         struct zd_usb_tx *tx = &usb->tx;
1017
1018         if (!atomic_read(&tx->enabled)) {
1019                 r = -ENOENT;
1020                 goto out;
1021         }
1022
1023         urb = usb_alloc_urb(0, GFP_ATOMIC);
1024         if (!urb) {
1025                 r = -ENOMEM;
1026                 goto out;
1027         }
1028
1029         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
1030                           skb->data, skb->len, tx_urb_complete, skb);
1031
1032         info->rate_driver_data[1] = (void *)jiffies;
1033         skb_queue_tail(&tx->submitted_skbs, skb);
1034         usb_anchor_urb(urb, &tx->submitted);
1035
1036         r = usb_submit_urb(urb, GFP_ATOMIC);
1037         if (r) {
1038                 dev_dbg_f(zd_usb_dev(usb), "error submit urb %p %d\n", urb, r);
1039                 usb_unanchor_urb(urb);
1040                 skb_unlink(skb, &tx->submitted_skbs);
1041                 goto error;
1042         }
1043         tx_inc_submitted_urbs(usb);
1044         return 0;
1045 error:
1046         usb_free_urb(urb);
1047 out:
1048         return r;
1049 }
1050
1051 static bool zd_tx_timeout(struct zd_usb *usb)
1052 {
1053         struct zd_usb_tx *tx = &usb->tx;
1054         struct sk_buff_head *q = &tx->submitted_skbs;
1055         struct sk_buff *skb, *skbnext;
1056         struct ieee80211_tx_info *info;
1057         unsigned long flags, trans_start;
1058         bool have_timedout = false;
1059
1060         spin_lock_irqsave(&q->lock, flags);
1061         skb_queue_walk_safe(q, skb, skbnext) {
1062                 info = IEEE80211_SKB_CB(skb);
1063                 trans_start = (unsigned long)info->rate_driver_data[1];
1064
1065                 if (time_is_before_jiffies(trans_start + ZD_TX_TIMEOUT)) {
1066                         have_timedout = true;
1067                         break;
1068                 }
1069         }
1070         spin_unlock_irqrestore(&q->lock, flags);
1071
1072         return have_timedout;
1073 }
1074
1075 static void zd_tx_watchdog_handler(struct work_struct *work)
1076 {
1077         struct zd_usb *usb =
1078                 container_of(work, struct zd_usb, tx.watchdog_work.work);
1079         struct zd_usb_tx *tx = &usb->tx;
1080
1081         if (!atomic_read(&tx->enabled) || !tx->watchdog_enabled)
1082                 goto out;
1083         if (!zd_tx_timeout(usb))
1084                 goto out;
1085
1086         /* TX halted, try reset */
1087         dev_warn(zd_usb_dev(usb), "TX-stall detected, resetting device...");
1088
1089         usb_queue_reset_device(usb->intf);
1090
1091         /* reset will stop this worker, don't rearm */
1092         return;
1093 out:
1094         queue_delayed_work(zd_workqueue, &tx->watchdog_work,
1095                            ZD_TX_WATCHDOG_INTERVAL);
1096 }
1097
1098 void zd_tx_watchdog_enable(struct zd_usb *usb)
1099 {
1100         struct zd_usb_tx *tx = &usb->tx;
1101
1102         if (!tx->watchdog_enabled) {
1103                 dev_dbg_f(zd_usb_dev(usb), "\n");
1104                 queue_delayed_work(zd_workqueue, &tx->watchdog_work,
1105                                    ZD_TX_WATCHDOG_INTERVAL);
1106                 tx->watchdog_enabled = 1;
1107         }
1108 }
1109
1110 void zd_tx_watchdog_disable(struct zd_usb *usb)
1111 {
1112         struct zd_usb_tx *tx = &usb->tx;
1113
1114         if (tx->watchdog_enabled) {
1115                 dev_dbg_f(zd_usb_dev(usb), "\n");
1116                 tx->watchdog_enabled = 0;
1117                 cancel_delayed_work_sync(&tx->watchdog_work);
1118         }
1119 }
1120
1121 static void zd_rx_idle_timer_handler(struct work_struct *work)
1122 {
1123         struct zd_usb *usb =
1124                 container_of(work, struct zd_usb, rx.idle_work.work);
1125         struct zd_mac *mac = zd_usb_to_mac(usb);
1126
1127         if (!test_bit(ZD_DEVICE_RUNNING, &mac->flags))
1128                 return;
1129
1130         dev_dbg_f(zd_usb_dev(usb), "\n");
1131
1132         /* 30 seconds since last rx, reset rx */
1133         zd_usb_reset_rx(usb);
1134 }
1135
1136 static void zd_usb_reset_rx_idle_timer_tasklet(struct tasklet_struct *t)
1137 {
1138         struct zd_usb *usb = from_tasklet(usb, t, rx.reset_timer_tasklet);
1139
1140         zd_usb_reset_rx_idle_timer(usb);
1141 }
1142
1143 void zd_usb_reset_rx_idle_timer(struct zd_usb *usb)
1144 {
1145         struct zd_usb_rx *rx = &usb->rx;
1146
1147         mod_delayed_work(zd_workqueue, &rx->idle_work, ZD_RX_IDLE_INTERVAL);
1148 }
1149
1150 static inline void init_usb_interrupt(struct zd_usb *usb)
1151 {
1152         struct zd_usb_interrupt *intr = &usb->intr;
1153
1154         spin_lock_init(&intr->lock);
1155         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
1156         init_completion(&intr->read_regs.completion);
1157         atomic_set(&intr->read_regs_enabled, 0);
1158         intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
1159 }
1160
1161 static inline void init_usb_rx(struct zd_usb *usb)
1162 {
1163         struct zd_usb_rx *rx = &usb->rx;
1164
1165         spin_lock_init(&rx->lock);
1166         mutex_init(&rx->setup_mutex);
1167         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
1168                 rx->usb_packet_size = 512;
1169         } else {
1170                 rx->usb_packet_size = 64;
1171         }
1172         ZD_ASSERT(rx->fragment_length == 0);
1173         INIT_DELAYED_WORK(&rx->idle_work, zd_rx_idle_timer_handler);
1174         rx->reset_timer_tasklet.func = (void (*))
1175                                         zd_usb_reset_rx_idle_timer_tasklet;
1176         rx->reset_timer_tasklet.data = (unsigned long)&rx->reset_timer_tasklet;
1177 }
1178
1179 static inline void init_usb_tx(struct zd_usb *usb)
1180 {
1181         struct zd_usb_tx *tx = &usb->tx;
1182
1183         spin_lock_init(&tx->lock);
1184         atomic_set(&tx->enabled, 0);
1185         tx->stopped = 0;
1186         skb_queue_head_init(&tx->submitted_skbs);
1187         init_usb_anchor(&tx->submitted);
1188         tx->submitted_urbs = 0;
1189         tx->watchdog_enabled = 0;
1190         INIT_DELAYED_WORK(&tx->watchdog_work, zd_tx_watchdog_handler);
1191 }
1192
1193 void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
1194                  struct usb_interface *intf)
1195 {
1196         memset(usb, 0, sizeof(*usb));
1197         usb->intf = usb_get_intf(intf);
1198         usb_set_intfdata(usb->intf, hw);
1199         init_usb_anchor(&usb->submitted_cmds);
1200         init_usb_interrupt(usb);
1201         init_usb_tx(usb);
1202         init_usb_rx(usb);
1203 }
1204
1205 void zd_usb_clear(struct zd_usb *usb)
1206 {
1207         usb_set_intfdata(usb->intf, NULL);
1208         usb_put_intf(usb->intf);
1209         ZD_MEMCLEAR(usb, sizeof(*usb));
1210         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
1211 }
1212
1213 static const char *speed(enum usb_device_speed speed)
1214 {
1215         switch (speed) {
1216         case USB_SPEED_LOW:
1217                 return "low";
1218         case USB_SPEED_FULL:
1219                 return "full";
1220         case USB_SPEED_HIGH:
1221                 return "high";
1222         default:
1223                 return "unknown speed";
1224         }
1225 }
1226
1227 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
1228 {
1229         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1230                 le16_to_cpu(udev->descriptor.idVendor),
1231                 le16_to_cpu(udev->descriptor.idProduct),
1232                 get_bcdDevice(udev),
1233                 speed(udev->speed));
1234 }
1235
1236 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1237 {
1238         struct usb_device *udev = interface_to_usbdev(usb->intf);
1239         return scnprint_id(udev, buffer, size);
1240 }
1241
1242 #ifdef DEBUG
1243 static void print_id(struct usb_device *udev)
1244 {
1245         char buffer[40];
1246
1247         scnprint_id(udev, buffer, sizeof(buffer));
1248         buffer[sizeof(buffer)-1] = 0;
1249         dev_dbg_f(&udev->dev, "%s\n", buffer);
1250 }
1251 #else
1252 #define print_id(udev) do { } while (0)
1253 #endif
1254
1255 static int eject_installer(struct usb_interface *intf)
1256 {
1257         struct usb_device *udev = interface_to_usbdev(intf);
1258         struct usb_host_interface *iface_desc = intf->cur_altsetting;
1259         struct usb_endpoint_descriptor *endpoint;
1260         unsigned char *cmd;
1261         u8 bulk_out_ep;
1262         int r;
1263
1264         if (iface_desc->desc.bNumEndpoints < 2)
1265                 return -ENODEV;
1266
1267         /* Find bulk out endpoint */
1268         for (r = 1; r >= 0; r--) {
1269                 endpoint = &iface_desc->endpoint[r].desc;
1270                 if (usb_endpoint_dir_out(endpoint) &&
1271                     usb_endpoint_xfer_bulk(endpoint)) {
1272                         bulk_out_ep = endpoint->bEndpointAddress;
1273                         break;
1274                 }
1275         }
1276         if (r == -1) {
1277                 dev_err(&udev->dev,
1278                         "zd1211rw: Could not find bulk out endpoint\n");
1279                 return -ENODEV;
1280         }
1281
1282         cmd = kzalloc(31, GFP_KERNEL);
1283         if (cmd == NULL)
1284                 return -ENODEV;
1285
1286         /* USB bulk command block */
1287         cmd[0] = 0x55;  /* bulk command signature */
1288         cmd[1] = 0x53;  /* bulk command signature */
1289         cmd[2] = 0x42;  /* bulk command signature */
1290         cmd[3] = 0x43;  /* bulk command signature */
1291         cmd[14] = 6;    /* command length */
1292
1293         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1294         cmd[19] = 0x2;  /* eject disc */
1295
1296         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1297         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1298                 cmd, 31, NULL, 2000);
1299         kfree(cmd);
1300         if (r)
1301                 return r;
1302
1303         /* At this point, the device disconnects and reconnects with the real
1304          * ID numbers. */
1305
1306         usb_set_intfdata(intf, NULL);
1307         return 0;
1308 }
1309
1310 int zd_usb_init_hw(struct zd_usb *usb)
1311 {
1312         int r;
1313         struct zd_mac *mac = zd_usb_to_mac(usb);
1314
1315         dev_dbg_f(zd_usb_dev(usb), "\n");
1316
1317         r = upload_firmware(usb);
1318         if (r) {
1319                 dev_err(zd_usb_dev(usb),
1320                        "couldn't load firmware. Error number %d\n", r);
1321                 return r;
1322         }
1323
1324         r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1325         if (r) {
1326                 dev_dbg_f(zd_usb_dev(usb),
1327                         "couldn't reset configuration. Error number %d\n", r);
1328                 return r;
1329         }
1330
1331         r = zd_mac_init_hw(mac->hw);
1332         if (r) {
1333                 dev_dbg_f(zd_usb_dev(usb),
1334                          "couldn't initialize mac. Error number %d\n", r);
1335                 return r;
1336         }
1337
1338         usb->initialized = 1;
1339         return 0;
1340 }
1341
1342 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1343 {
1344         int r;
1345         struct usb_device *udev = interface_to_usbdev(intf);
1346         struct zd_usb *usb;
1347         struct ieee80211_hw *hw = NULL;
1348
1349         print_id(udev);
1350
1351         if (id->driver_info & DEVICE_INSTALLER)
1352                 return eject_installer(intf);
1353
1354         switch (udev->speed) {
1355         case USB_SPEED_LOW:
1356         case USB_SPEED_FULL:
1357         case USB_SPEED_HIGH:
1358                 break;
1359         default:
1360                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1361                 r = -ENODEV;
1362                 goto error;
1363         }
1364
1365         r = usb_reset_device(udev);
1366         if (r) {
1367                 dev_err(&intf->dev,
1368                         "couldn't reset usb device. Error number %d\n", r);
1369                 goto error;
1370         }
1371
1372         hw = zd_mac_alloc_hw(intf);
1373         if (hw == NULL) {
1374                 r = -ENOMEM;
1375                 goto error;
1376         }
1377
1378         usb = &zd_hw_mac(hw)->chip.usb;
1379         usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1380
1381         r = zd_mac_preinit_hw(hw);
1382         if (r) {
1383                 dev_dbg_f(&intf->dev,
1384                          "couldn't initialize mac. Error number %d\n", r);
1385                 goto error;
1386         }
1387
1388         r = ieee80211_register_hw(hw);
1389         if (r) {
1390                 dev_dbg_f(&intf->dev,
1391                          "couldn't register device. Error number %d\n", r);
1392                 goto error;
1393         }
1394
1395         dev_dbg_f(&intf->dev, "successful\n");
1396         dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
1397         return 0;
1398 error:
1399         usb_reset_device(interface_to_usbdev(intf));
1400         if (hw) {
1401                 zd_mac_clear(zd_hw_mac(hw));
1402                 ieee80211_free_hw(hw);
1403         }
1404         return r;
1405 }
1406
1407 static void disconnect(struct usb_interface *intf)
1408 {
1409         struct ieee80211_hw *hw = zd_intf_to_hw(intf);
1410         struct zd_mac *mac;
1411         struct zd_usb *usb;
1412
1413         /* Either something really bad happened, or we're just dealing with
1414          * a DEVICE_INSTALLER. */
1415         if (hw == NULL)
1416                 return;
1417
1418         mac = zd_hw_mac(hw);
1419         usb = &mac->chip.usb;
1420
1421         dev_dbg_f(zd_usb_dev(usb), "\n");
1422
1423         ieee80211_unregister_hw(hw);
1424
1425         /* Just in case something has gone wrong! */
1426         zd_usb_disable_tx(usb);
1427         zd_usb_disable_rx(usb);
1428         zd_usb_disable_int(usb);
1429
1430         /* If the disconnect has been caused by a removal of the
1431          * driver module, the reset allows reloading of the driver. If the
1432          * reset will not be executed here, the upload of the firmware in the
1433          * probe function caused by the reloading of the driver will fail.
1434          */
1435         usb_reset_device(interface_to_usbdev(intf));
1436
1437         zd_mac_clear(mac);
1438         ieee80211_free_hw(hw);
1439         dev_dbg(&intf->dev, "disconnected\n");
1440 }
1441
1442 static void zd_usb_resume(struct zd_usb *usb)
1443 {
1444         struct zd_mac *mac = zd_usb_to_mac(usb);
1445         int r;
1446
1447         dev_dbg_f(zd_usb_dev(usb), "\n");
1448
1449         r = zd_op_start(zd_usb_to_hw(usb));
1450         if (r < 0) {
1451                 dev_warn(zd_usb_dev(usb), "Device resume failed "
1452                          "with error code %d. Retrying...\n", r);
1453                 if (usb->was_running)
1454                         set_bit(ZD_DEVICE_RUNNING, &mac->flags);
1455                 usb_queue_reset_device(usb->intf);
1456                 return;
1457         }
1458
1459         if (mac->type != NL80211_IFTYPE_UNSPECIFIED) {
1460                 r = zd_restore_settings(mac);
1461                 if (r < 0) {
1462                         dev_dbg(zd_usb_dev(usb),
1463                                 "failed to restore settings, %d\n", r);
1464                         return;
1465                 }
1466         }
1467 }
1468
1469 static void zd_usb_stop(struct zd_usb *usb)
1470 {
1471         dev_dbg_f(zd_usb_dev(usb), "\n");
1472
1473         zd_op_stop(zd_usb_to_hw(usb));
1474
1475         zd_usb_disable_tx(usb);
1476         zd_usb_disable_rx(usb);
1477         zd_usb_disable_int(usb);
1478
1479         usb->initialized = 0;
1480 }
1481
1482 static int pre_reset(struct usb_interface *intf)
1483 {
1484         struct ieee80211_hw *hw = usb_get_intfdata(intf);
1485         struct zd_mac *mac;
1486         struct zd_usb *usb;
1487
1488         if (!hw || intf->condition != USB_INTERFACE_BOUND)
1489                 return 0;
1490
1491         mac = zd_hw_mac(hw);
1492         usb = &mac->chip.usb;
1493
1494         usb->was_running = test_bit(ZD_DEVICE_RUNNING, &mac->flags);
1495
1496         zd_usb_stop(usb);
1497
1498         mutex_lock(&mac->chip.mutex);
1499         return 0;
1500 }
1501
1502 static int post_reset(struct usb_interface *intf)
1503 {
1504         struct ieee80211_hw *hw = usb_get_intfdata(intf);
1505         struct zd_mac *mac;
1506         struct zd_usb *usb;
1507
1508         if (!hw || intf->condition != USB_INTERFACE_BOUND)
1509                 return 0;
1510
1511         mac = zd_hw_mac(hw);
1512         usb = &mac->chip.usb;
1513
1514         mutex_unlock(&mac->chip.mutex);
1515
1516         if (usb->was_running)
1517                 zd_usb_resume(usb);
1518         return 0;
1519 }
1520
1521 static struct usb_driver driver = {
1522         .name           = KBUILD_MODNAME,
1523         .id_table       = usb_ids,
1524         .probe          = probe,
1525         .disconnect     = disconnect,
1526         .pre_reset      = pre_reset,
1527         .post_reset     = post_reset,
1528         .disable_hub_initiated_lpm = 1,
1529 };
1530
1531 struct workqueue_struct *zd_workqueue;
1532
1533 static int __init usb_init(void)
1534 {
1535         int r;
1536
1537         pr_debug("%s usb_init()\n", driver.name);
1538
1539         zd_workqueue = create_singlethread_workqueue(driver.name);
1540         if (zd_workqueue == NULL) {
1541                 pr_err("%s couldn't create workqueue\n", driver.name);
1542                 return -ENOMEM;
1543         }
1544
1545         r = usb_register(&driver);
1546         if (r) {
1547                 destroy_workqueue(zd_workqueue);
1548                 pr_err("%s usb_register() failed. Error number %d\n",
1549                        driver.name, r);
1550                 return r;
1551         }
1552
1553         pr_debug("%s initialized\n", driver.name);
1554         return 0;
1555 }
1556
1557 static void __exit usb_exit(void)
1558 {
1559         pr_debug("%s usb_exit()\n", driver.name);
1560         usb_deregister(&driver);
1561         destroy_workqueue(zd_workqueue);
1562 }
1563
1564 module_init(usb_init);
1565 module_exit(usb_exit);
1566
1567 static int zd_ep_regs_out_msg(struct usb_device *udev, void *data, int len,
1568                               int *actual_length, int timeout)
1569 {
1570         /* In USB 2.0 mode EP_REGS_OUT endpoint is interrupt type. However in
1571          * USB 1.1 mode endpoint is bulk. Select correct type URB by endpoint
1572          * descriptor.
1573          */
1574         struct usb_host_endpoint *ep;
1575         unsigned int pipe;
1576
1577         pipe = usb_sndintpipe(udev, EP_REGS_OUT);
1578         ep = usb_pipe_endpoint(udev, pipe);
1579         if (!ep)
1580                 return -EINVAL;
1581
1582         if (usb_endpoint_xfer_int(&ep->desc)) {
1583                 return usb_interrupt_msg(udev, pipe, data, len,
1584                                          actual_length, timeout);
1585         } else {
1586                 pipe = usb_sndbulkpipe(udev, EP_REGS_OUT);
1587                 return usb_bulk_msg(udev, pipe, data, len, actual_length,
1588                                     timeout);
1589         }
1590 }
1591
1592 static void prepare_read_regs_int(struct zd_usb *usb,
1593                                   struct usb_req_read_regs *req,
1594                                   unsigned int count)
1595 {
1596         struct zd_usb_interrupt *intr = &usb->intr;
1597
1598         spin_lock_irq(&intr->lock);
1599         atomic_set(&intr->read_regs_enabled, 1);
1600         intr->read_regs.req = req;
1601         intr->read_regs.req_count = count;
1602         reinit_completion(&intr->read_regs.completion);
1603         spin_unlock_irq(&intr->lock);
1604 }
1605
1606 static void disable_read_regs_int(struct zd_usb *usb)
1607 {
1608         struct zd_usb_interrupt *intr = &usb->intr;
1609
1610         spin_lock_irq(&intr->lock);
1611         atomic_set(&intr->read_regs_enabled, 0);
1612         spin_unlock_irq(&intr->lock);
1613 }
1614
1615 static bool check_read_regs(struct zd_usb *usb, struct usb_req_read_regs *req,
1616                             unsigned int count)
1617 {
1618         int i;
1619         struct zd_usb_interrupt *intr = &usb->intr;
1620         struct read_regs_int *rr = &intr->read_regs;
1621         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1622
1623         /* The created block size seems to be larger than expected.
1624          * However results appear to be correct.
1625          */
1626         if (rr->length < struct_size(regs, regs, count)) {
1627                 dev_dbg_f(zd_usb_dev(usb),
1628                          "error: actual length %d less than expected %zu\n",
1629                          rr->length, struct_size(regs, regs, count));
1630                 return false;
1631         }
1632
1633         if (rr->length > sizeof(rr->buffer)) {
1634                 dev_dbg_f(zd_usb_dev(usb),
1635                          "error: actual length %d exceeds buffer size %zu\n",
1636                          rr->length, sizeof(rr->buffer));
1637                 return false;
1638         }
1639
1640         for (i = 0; i < count; i++) {
1641                 struct reg_data *rd = &regs->regs[i];
1642                 if (rd->addr != req->addr[i]) {
1643                         dev_dbg_f(zd_usb_dev(usb),
1644                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1645                                  le16_to_cpu(rd->addr),
1646                                  le16_to_cpu(req->addr[i]));
1647                         return false;
1648                 }
1649         }
1650
1651         return true;
1652 }
1653
1654 static int get_results(struct zd_usb *usb, u16 *values,
1655                        struct usb_req_read_regs *req, unsigned int count,
1656                        bool *retry)
1657 {
1658         int r;
1659         int i;
1660         struct zd_usb_interrupt *intr = &usb->intr;
1661         struct read_regs_int *rr = &intr->read_regs;
1662         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1663
1664         spin_lock_irq(&intr->lock);
1665
1666         r = -EIO;
1667
1668         /* Read failed because firmware bug? */
1669         *retry = !!intr->read_regs_int_overridden;
1670         if (*retry)
1671                 goto error_unlock;
1672
1673         if (!check_read_regs(usb, req, count)) {
1674                 dev_dbg_f(zd_usb_dev(usb), "error: invalid read regs\n");
1675                 goto error_unlock;
1676         }
1677
1678         for (i = 0; i < count; i++) {
1679                 struct reg_data *rd = &regs->regs[i];
1680                 values[i] = le16_to_cpu(rd->value);
1681         }
1682
1683         r = 0;
1684 error_unlock:
1685         spin_unlock_irq(&intr->lock);
1686         return r;
1687 }
1688
1689 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1690                      const zd_addr_t *addresses, unsigned int count)
1691 {
1692         int r, i, req_len, actual_req_len, try_count = 0;
1693         struct usb_device *udev;
1694         struct usb_req_read_regs *req = NULL;
1695         unsigned long timeout;
1696         bool retry = false;
1697
1698         if (count < 1) {
1699                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1700                 return -EINVAL;
1701         }
1702         if (count > USB_MAX_IOREAD16_COUNT) {
1703                 dev_dbg_f(zd_usb_dev(usb),
1704                          "error: count %u exceeds possible max %u\n",
1705                          count, USB_MAX_IOREAD16_COUNT);
1706                 return -EINVAL;
1707         }
1708         if (!usb_int_enabled(usb)) {
1709                 dev_dbg_f(zd_usb_dev(usb),
1710                           "error: usb interrupt not enabled\n");
1711                 return -EWOULDBLOCK;
1712         }
1713
1714         ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1715         BUILD_BUG_ON(sizeof(struct usb_req_read_regs) + USB_MAX_IOREAD16_COUNT *
1716                      sizeof(__le16) > sizeof(usb->req_buf));
1717         BUG_ON(sizeof(struct usb_req_read_regs) + count * sizeof(__le16) >
1718                sizeof(usb->req_buf));
1719
1720         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1721         req = (void *)usb->req_buf;
1722
1723         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1724         for (i = 0; i < count; i++)
1725                 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1726
1727 retry_read:
1728         try_count++;
1729         udev = zd_usb_to_usbdev(usb);
1730         prepare_read_regs_int(usb, req, count);
1731         r = zd_ep_regs_out_msg(udev, req, req_len, &actual_req_len, 50 /*ms*/);
1732         if (r) {
1733                 dev_dbg_f(zd_usb_dev(usb),
1734                         "error in zd_ep_regs_out_msg(). Error number %d\n", r);
1735                 goto error;
1736         }
1737         if (req_len != actual_req_len) {
1738                 dev_dbg_f(zd_usb_dev(usb), "error in zd_ep_regs_out_msg()\n"
1739                         " req_len %d != actual_req_len %d\n",
1740                         req_len, actual_req_len);
1741                 r = -EIO;
1742                 goto error;
1743         }
1744
1745         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1746                                               msecs_to_jiffies(50));
1747         if (!timeout) {
1748                 disable_read_regs_int(usb);
1749                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1750                 r = -ETIMEDOUT;
1751                 goto error;
1752         }
1753
1754         r = get_results(usb, values, req, count, &retry);
1755         if (retry && try_count < 20) {
1756                 dev_dbg_f(zd_usb_dev(usb), "read retry, tries so far: %d\n",
1757                                 try_count);
1758                 goto retry_read;
1759         }
1760 error:
1761         return r;
1762 }
1763
1764 static void iowrite16v_urb_complete(struct urb *urb)
1765 {
1766         struct zd_usb *usb = urb->context;
1767
1768         if (urb->status && !usb->cmd_error)
1769                 usb->cmd_error = urb->status;
1770
1771         if (!usb->cmd_error &&
1772                         urb->actual_length != urb->transfer_buffer_length)
1773                 usb->cmd_error = -EIO;
1774 }
1775
1776 static int zd_submit_waiting_urb(struct zd_usb *usb, bool last)
1777 {
1778         int r = 0;
1779         struct urb *urb = usb->urb_async_waiting;
1780
1781         if (!urb)
1782                 return 0;
1783
1784         usb->urb_async_waiting = NULL;
1785
1786         if (!last)
1787                 urb->transfer_flags |= URB_NO_INTERRUPT;
1788
1789         usb_anchor_urb(urb, &usb->submitted_cmds);
1790         r = usb_submit_urb(urb, GFP_KERNEL);
1791         if (r) {
1792                 usb_unanchor_urb(urb);
1793                 dev_dbg_f(zd_usb_dev(usb),
1794                         "error in usb_submit_urb(). Error number %d\n", r);
1795                 goto error;
1796         }
1797
1798         /* fall-through with r == 0 */
1799 error:
1800         usb_free_urb(urb);
1801         return r;
1802 }
1803
1804 void zd_usb_iowrite16v_async_start(struct zd_usb *usb)
1805 {
1806         ZD_ASSERT(usb_anchor_empty(&usb->submitted_cmds));
1807         ZD_ASSERT(usb->urb_async_waiting == NULL);
1808         ZD_ASSERT(!usb->in_async);
1809
1810         ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1811
1812         usb->in_async = 1;
1813         usb->cmd_error = 0;
1814         usb->urb_async_waiting = NULL;
1815 }
1816
1817 int zd_usb_iowrite16v_async_end(struct zd_usb *usb, unsigned int timeout)
1818 {
1819         int r;
1820
1821         ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1822         ZD_ASSERT(usb->in_async);
1823
1824         /* Submit last iowrite16v URB */
1825         r = zd_submit_waiting_urb(usb, true);
1826         if (r) {
1827                 dev_dbg_f(zd_usb_dev(usb),
1828                         "error in zd_submit_waiting_usb(). "
1829                         "Error number %d\n", r);
1830
1831                 usb_kill_anchored_urbs(&usb->submitted_cmds);
1832                 goto error;
1833         }
1834
1835         if (timeout)
1836                 timeout = usb_wait_anchor_empty_timeout(&usb->submitted_cmds,
1837                                                         timeout);
1838         if (!timeout) {
1839                 usb_kill_anchored_urbs(&usb->submitted_cmds);
1840                 if (usb->cmd_error == -ENOENT) {
1841                         dev_dbg_f(zd_usb_dev(usb), "timed out");
1842                         r = -ETIMEDOUT;
1843                         goto error;
1844                 }
1845         }
1846
1847         r = usb->cmd_error;
1848 error:
1849         usb->in_async = 0;
1850         return r;
1851 }
1852
1853 int zd_usb_iowrite16v_async(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1854                             unsigned int count)
1855 {
1856         int r;
1857         struct usb_device *udev;
1858         struct usb_req_write_regs *req = NULL;
1859         int i, req_len;
1860         struct urb *urb;
1861         struct usb_host_endpoint *ep;
1862
1863         ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1864         ZD_ASSERT(usb->in_async);
1865
1866         if (count == 0)
1867                 return 0;
1868         if (count > USB_MAX_IOWRITE16_COUNT) {
1869                 dev_dbg_f(zd_usb_dev(usb),
1870                         "error: count %u exceeds possible max %u\n",
1871                         count, USB_MAX_IOWRITE16_COUNT);
1872                 return -EINVAL;
1873         }
1874
1875         udev = zd_usb_to_usbdev(usb);
1876
1877         ep = usb_pipe_endpoint(udev, usb_sndintpipe(udev, EP_REGS_OUT));
1878         if (!ep)
1879                 return -ENOENT;
1880
1881         urb = usb_alloc_urb(0, GFP_KERNEL);
1882         if (!urb)
1883                 return -ENOMEM;
1884
1885         req_len = struct_size(req, reg_writes, count);
1886         req = kmalloc(req_len, GFP_KERNEL);
1887         if (!req) {
1888                 r = -ENOMEM;
1889                 goto error;
1890         }
1891
1892         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1893         for (i = 0; i < count; i++) {
1894                 struct reg_data *rw  = &req->reg_writes[i];
1895                 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1896                 rw->value = cpu_to_le16(ioreqs[i].value);
1897         }
1898
1899         /* In USB 2.0 mode endpoint is interrupt type. However in USB 1.1 mode
1900          * endpoint is bulk. Select correct type URB by endpoint descriptor.
1901          */
1902         if (usb_endpoint_xfer_int(&ep->desc))
1903                 usb_fill_int_urb(urb, udev, usb_sndintpipe(udev, EP_REGS_OUT),
1904                                  req, req_len, iowrite16v_urb_complete, usb,
1905                                  ep->desc.bInterval);
1906         else
1907                 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1908                                   req, req_len, iowrite16v_urb_complete, usb);
1909
1910         urb->transfer_flags |= URB_FREE_BUFFER;
1911
1912         /* Submit previous URB */
1913         r = zd_submit_waiting_urb(usb, false);
1914         if (r) {
1915                 dev_dbg_f(zd_usb_dev(usb),
1916                         "error in zd_submit_waiting_usb(). "
1917                         "Error number %d\n", r);
1918                 goto error;
1919         }
1920
1921         /* Delay submit so that URB_NO_INTERRUPT flag can be set for all URBs
1922          * of currect batch except for very last.
1923          */
1924         usb->urb_async_waiting = urb;
1925         return 0;
1926 error:
1927         usb_free_urb(urb);
1928         return r;
1929 }
1930
1931 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1932                         unsigned int count)
1933 {
1934         int r;
1935
1936         zd_usb_iowrite16v_async_start(usb);
1937         r = zd_usb_iowrite16v_async(usb, ioreqs, count);
1938         if (r) {
1939                 zd_usb_iowrite16v_async_end(usb, 0);
1940                 return r;
1941         }
1942         return zd_usb_iowrite16v_async_end(usb, 50 /* ms */);
1943 }
1944
1945 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1946 {
1947         int r;
1948         struct usb_device *udev;
1949         struct usb_req_rfwrite *req = NULL;
1950         int i, req_len, actual_req_len;
1951         u16 bit_value_template;
1952
1953         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1954                 dev_dbg_f(zd_usb_dev(usb),
1955                         "error: bits %d are smaller than"
1956                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1957                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1958                 return -EINVAL;
1959         }
1960         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1961                 dev_dbg_f(zd_usb_dev(usb),
1962                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1963                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1964                 return -EINVAL;
1965         }
1966 #ifdef DEBUG
1967         if (value & (~0UL << bits)) {
1968                 dev_dbg_f(zd_usb_dev(usb),
1969                         "error: value %#09x has bits >= %d set\n",
1970                         value, bits);
1971                 return -EINVAL;
1972         }
1973 #endif /* DEBUG */
1974
1975         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1976
1977         r = zd_usb_ioread16(usb, &bit_value_template, ZD_CR203);
1978         if (r) {
1979                 dev_dbg_f(zd_usb_dev(usb),
1980                         "error %d: Couldn't read ZD_CR203\n", r);
1981                 return r;
1982         }
1983         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1984
1985         ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1986         BUILD_BUG_ON(sizeof(struct usb_req_rfwrite) +
1987                      USB_MAX_RFWRITE_BIT_COUNT * sizeof(__le16) >
1988                      sizeof(usb->req_buf));
1989         BUG_ON(sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16) >
1990                sizeof(usb->req_buf));
1991
1992         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1993         req = (void *)usb->req_buf;
1994
1995         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1996         /* 1: 3683a, but not used in ZYDAS driver */
1997         req->value = cpu_to_le16(2);
1998         req->bits = cpu_to_le16(bits);
1999
2000         for (i = 0; i < bits; i++) {
2001                 u16 bv = bit_value_template;
2002                 if (value & (1 << (bits-1-i)))
2003                         bv |= RF_DATA;
2004                 req->bit_values[i] = cpu_to_le16(bv);
2005         }
2006
2007         udev = zd_usb_to_usbdev(usb);
2008         r = zd_ep_regs_out_msg(udev, req, req_len, &actual_req_len, 50 /*ms*/);
2009         if (r) {
2010                 dev_dbg_f(zd_usb_dev(usb),
2011                         "error in zd_ep_regs_out_msg(). Error number %d\n", r);
2012                 goto out;
2013         }
2014         if (req_len != actual_req_len) {
2015                 dev_dbg_f(zd_usb_dev(usb), "error in zd_ep_regs_out_msg()"
2016                         " req_len %d != actual_req_len %d\n",
2017                         req_len, actual_req_len);
2018                 r = -EIO;
2019                 goto out;
2020         }
2021
2022         /* FALL-THROUGH with r == 0 */
2023 out:
2024         return r;
2025 }