drivers/net/wireless/zydas/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, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/init.h>
  23 #include <linux/firmware.h>
  24 #include <linux/device.h>
  25 #include <linux/errno.h>
  26 #include <linux/slab.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/usb.h>
  29 #include <linux/workqueue.h>
  30 #include <linux/module.h>
  31 #include <net/mac80211.h>
  32 #include <asm/unaligned.h>
  33
  34 #include "zd_def.h"
  35 #include "zd_mac.h"
  36 #include "zd_usb.h"
  37
  38 static const struct usb_device_id usb_ids[] = {
  39         /* ZD1211 */
  40         { USB_DEVICE(0x0105, 0x145f), .driver_info = DEVICE_ZD1211 },
  41         { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
  42         { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
  43         { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
  44         { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
  45         { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
  46         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
  47         { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
  48         { USB_DEVICE(0x0ace, 0xa211), .driver_info = DEVICE_ZD1211 },
  49         { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
  50         { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
  51         { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
  52         { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
  53         { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
  54         { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
  55         { USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 },
  56         { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
  57         { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
  58         { USB_DEVICE(0x14ea, 0xab10), .driver_info = DEVICE_ZD1211 },
  59         { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
  60         { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 },
  61         { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
  62         { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
  63         { USB_DEVICE(0x157e, 0x3207), .driver_info = DEVICE_ZD1211 },
  64         { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
  65         { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
  66         /* ZD1211B */
  67         { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
  68         { USB_DEVICE(0x0409, 0x0248), .driver_info = DEVICE_ZD1211B },
  69         { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
  70         { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
  71         { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
  72         { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
  73         { USB_DEVICE(0x054c, 0x0257), .driver_info = DEVICE_ZD1211B },
  74         { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
  75         { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
  76         { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
  77         { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
  78         { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
  79         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  80         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211B },
  81         { USB_DEVICE(0x07fa, 0x1196), .driver_info = DEVICE_ZD1211B },
  82         { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
  83         { USB_DEVICE(0x083a, 0xe501), .driver_info = DEVICE_ZD1211B },
  84         { USB_DEVICE(0x083a, 0xe503), .driver_info = DEVICE_ZD1211B },
  85         { USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B },
  86         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  87         { USB_DEVICE(0x0ace, 0xb215), .driver_info = DEVICE_ZD1211B },
  88         { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
  89         { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
  90         { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
  91         { USB_DEVICE(0x0df6, 0x0036), .driver_info = DEVICE_ZD1211B },
  92         { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
  93         { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
  94         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  95         { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
  96         { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
  97         { USB_DEVICE(0x2019, 0xed01), .driver_info = DEVICE_ZD1211B },
  98         /* "Driverless" devices that need ejecting */
  99         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
 100         { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
 101         {}
 102 };
 103
 104 MODULE_LICENSE("GPL");
 105 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
 106 MODULE_AUTHOR("Ulrich Kunitz");
 107 MODULE_AUTHOR("Daniel Drake");
 108 MODULE_VERSION("1.0");
 109 MODULE_DEVICE_TABLE(usb, usb_ids);
 110
 111 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
 112 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
 113
 114 static bool check_read_regs(struct zd_usb *usb, struct usb_req_read_regs *req,
 115                             unsigned int count);
 116
 117 /* USB device initialization */
 118 static void int_urb_complete(struct urb *urb);
 119
 120 static int request_fw_file(
 121         const struct firmware **fw, const char *name, struct device *device)
 122 {
 123         int r;
 124
 125         dev_dbg_f(device, "fw name %s\n", name);
 126
 127         r = request_firmware(fw, name, device);
 128         if (r)
 129                 dev_err(device,
 130                        "Could not load firmware file %s. Error number %d\n",
 131                        name, r);
 132         return r;
 133 }
 134
 135 static inline u16 get_bcdDevice(const struct usb_device *udev)
 136 {
 137         return le16_to_cpu(udev->descriptor.bcdDevice);
 138 }
 139
 140 enum upload_code_flags {
 141         REBOOT = 1,
 142 };
 143
 144 /* Ensures that MAX_TRANSFER_SIZE is even. */
 145 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 146
 147 static int upload_code(struct usb_device *udev,
 148         const u8 *data, size_t size, u16 code_offset, int flags)
 149 {
 150         u8 *p;
 151         int r;
 152
 153         /* USB request blocks need "kmalloced" buffers.
 154          */
 155         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 156         if (!p) {
 157                 r = -ENOMEM;
 158                 goto error;
 159         }
 160
 161         size &= ~1;
 162         while (size > 0) {
 163                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 164                         size : MAX_TRANSFER_SIZE;
 165
 166                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 167
 168                 memcpy(p, data, transfer_size);
 169                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 170                         USB_REQ_FIRMWARE_DOWNLOAD,
 171                         USB_DIR_OUT | USB_TYPE_VENDOR,
 172                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 173                 if (r < 0) {
 174                         dev_err(&udev->dev,
 175                                "USB control request for firmware upload"
 176                                " failed. Error number %d\n", r);
 177                         goto error;
 178                 }
 179                 transfer_size = r & ~1;
 180
 181                 size -= transfer_size;
 182                 data += transfer_size;
 183                 code_offset += transfer_size/sizeof(u16);
 184         }
 185
 186         if (flags & REBOOT) {
 187                 u8 ret;
 188
 189                 /* Use "DMA-aware" buffer. */
 190                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 191                         USB_REQ_FIRMWARE_CONFIRM,
 192                         USB_DIR_IN | USB_TYPE_VENDOR,
 193                         0, 0, p, sizeof(ret), 5000 /* ms */);
 194                 if (r != sizeof(ret)) {
 195                         dev_err(&udev->dev,
 196                                 "control request firmware confirmation failed."
 197                                 " Return value %d\n", r);
 198                         if (r >= 0)
 199                                 r = -ENODEV;
 200                         goto error;
 201                 }
 202                 ret = p[0];
 203                 if (ret & 0x80) {
 204                         dev_err(&udev->dev,
 205                                 "Internal error while downloading."
 206                                 " Firmware confirm return value %#04x\n",
 207                                 (unsigned int)ret);
 208                         r = -ENODEV;
 209                         goto error;
 210                 }
 211                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 212                         (unsigned int)ret);
 213         }
 214
 215         r = 0;
 216 error:
 217         kfree(p);
 218         return r;
 219 }
 220
 221 static u16 get_word(const void *data, u16 offset)
 222 {
 223         const __le16 *p = data;
 224         return le16_to_cpu(p[offset]);
 225 }
 226
 227 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
 228                        const char* postfix)
 229 {
 230         scnprintf(buffer, size, "%s%s",
 231                 usb->is_zd1211b ?
 232                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 233                 postfix);
 234         return buffer;
 235 }
 236
 237 static int handle_version_mismatch(struct zd_usb *usb,
 238         const struct firmware *ub_fw)
 239 {
 240         struct usb_device *udev = zd_usb_to_usbdev(usb);
 241         const struct firmware *ur_fw = NULL;
 242         int offset;
 243         int r = 0;
 244         char fw_name[128];
 245
 246         r = request_fw_file(&ur_fw,
 247                 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
 248                 &udev->dev);
 249         if (r)
 250                 goto error;
 251
 252         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
 253         if (r)
 254                 goto error;
 255
 256         offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
 257         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
 258                 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
 259
 260         /* At this point, the vendor driver downloads the whole firmware
 261          * image, hacks around with version IDs, and uploads it again,
 262          * completely overwriting the boot code. We do not do this here as
 263          * it is not required on any tested devices, and it is suspected to
 264          * cause problems. */
 265 error:
 266         release_firmware(ur_fw);
 267         return r;
 268 }
 269
 270 static int upload_firmware(struct zd_usb *usb)
 271 {
 272         int r;
 273         u16 fw_bcdDevice;
 274         u16 bcdDevice;
 275         struct usb_device *udev = zd_usb_to_usbdev(usb);
 276         const struct firmware *ub_fw = NULL;
 277         const struct firmware *uph_fw = NULL;
 278         char fw_name[128];
 279
 280         bcdDevice = get_bcdDevice(udev);
 281
 282         r = request_fw_file(&ub_fw,
 283                 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
 284                 &udev->dev);
 285         if (r)
 286                 goto error;
 287
 288         fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
 289
 290         if (fw_bcdDevice != bcdDevice) {
 291                 dev_info(&udev->dev,
 292                         "firmware version %#06x and device bootcode version "
 293                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
 294                 if (bcdDevice <= 0x4313)
 295                         dev_warn(&udev->dev, "device has old bootcode, please "
 296                                 "report success or failure\n");
 297
 298                 r = handle_version_mismatch(usb, ub_fw);
 299                 if (r)
 300                         goto error;
 301         } else {
 302                 dev_dbg_f(&udev->dev,
 303                         "firmware device id %#06x is equal to the "
 304                         "actual device id\n", fw_bcdDevice);
 305         }
 306
 307
 308         r = request_fw_file(&uph_fw,
 309                 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
 310                 &udev->dev);
 311         if (r)
 312                 goto error;
 313
 314         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
 315         if (r) {
 316                 dev_err(&udev->dev,
 317                         "Could not upload firmware code uph. Error number %d\n",
 318                         r);
 319         }
 320
 321         /* FALL-THROUGH */
 322 error:
 323         release_firmware(ub_fw);
 324         release_firmware(uph_fw);
 325         return r;
 326 }
 327
 328 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ur");
 329 MODULE_FIRMWARE(FW_ZD1211_PREFIX "ur");
 330 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ub");
 331 MODULE_FIRMWARE(FW_ZD1211_PREFIX "ub");
 332 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "uphr");
 333 MODULE_FIRMWARE(FW_ZD1211_PREFIX "uphr");
 334
 335 /* Read data from device address space using "firmware interface" which does
 336  * not require firmware to be loaded. */
 337 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
 338 {
 339         int r;
 340         struct usb_device *udev = zd_usb_to_usbdev(usb);
 341         u8 *buf;
 342
 343         /* Use "DMA-aware" buffer. */
 344         buf = kmalloc(len, GFP_KERNEL);
 345         if (!buf)
 346                 return -ENOMEM;
 347         r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 348                 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
 349                 buf, len, 5000);
 350         if (r < 0) {
 351                 dev_err(&udev->dev,
 352                         "read over firmware interface failed: %d\n", r);
 353                 goto exit;
 354         } else if (r != len) {
 355                 dev_err(&udev->dev,
 356                         "incomplete read over firmware interface: %d/%d\n",
 357                         r, len);
 358                 r = -EIO;
 359                 goto exit;
 360         }
 361         r = 0;
 362         memcpy(data, buf, len);
 363 exit:
 364         kfree(buf);
 365         return r;
 366 }
 367
 368 #define urb_dev(urb) (&(urb)->dev->dev)
 369
 370 static inline void handle_regs_int_override(struct urb *urb)
 371 {
 372         struct zd_usb *usb = urb->context;
 373         struct zd_usb_interrupt *intr = &usb->intr;
 374         unsigned long flags;
 375
 376         spin_lock_irqsave(&intr->lock, flags);
 377         if (atomic_read(&intr->read_regs_enabled)) {
 378                 atomic_set(&intr->read_regs_enabled, 0);
 379                 intr->read_regs_int_overridden = 1;
 380                 complete(&intr->read_regs.completion);
 381         }
 382         spin_unlock_irqrestore(&intr->lock, flags);
 383 }
 384
 385 static inline void handle_regs_int(struct urb *urb)
 386 {
 387         struct zd_usb *usb = urb->context;
 388         struct zd_usb_interrupt *intr = &usb->intr;
 389         unsigned long flags;
 390         int len;
 391         u16 int_num;
 392
 393         ZD_ASSERT(in_interrupt());
 394         spin_lock_irqsave(&intr->lock, flags);
 395
 396         int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));
 397         if (int_num == CR_INTERRUPT) {
 398                 struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
 399                 spin_lock(&mac->lock);
 400                 memcpy(&mac->intr_buffer, urb->transfer_buffer,
 401                                 USB_MAX_EP_INT_BUFFER);
 402                 spin_unlock(&mac->lock);
 403                 schedule_work(&mac->process_intr);
 404         } else if (atomic_read(&intr->read_regs_enabled)) {
 405                 len = urb->actual_length;
 406                 intr->read_regs.length = urb->actual_length;
 407                 if (len > sizeof(intr->read_regs.buffer))
 408                         len = sizeof(intr->read_regs.buffer);
 409
 410                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 411
 412                 /* Sometimes USB_INT_ID_REGS is not overridden, but comes after
 413                  * USB_INT_ID_RETRY_FAILED. Read-reg retry then gets this
 414                  * delayed USB_INT_ID_REGS, but leaves USB_INT_ID_REGS of
 415                  * retry unhandled. Next read-reg command then might catch
 416                  * this wrong USB_INT_ID_REGS. Fix by ignoring wrong reads.
 417                  */
 418                 if (!check_read_regs(usb, intr->read_regs.req,
 419                                                 intr->read_regs.req_count))
 420                         goto out;
 421
 422                 atomic_set(&intr->read_regs_enabled, 0);
 423                 intr->read_regs_int_overridden = 0;
 424                 complete(&intr->read_regs.completion);
 425
 426                 goto out;
 427         }
 428
 429 out:
 430         spin_unlock_irqrestore(&intr->lock, flags);
 431
 432         /* CR_INTERRUPT might override read_reg too. */
 433         if (int_num == CR_INTERRUPT && atomic_read(&intr->read_regs_enabled))
 434                 handle_regs_int_override(urb);
 435 }
 436
 437 static void int_urb_complete(struct urb *urb)
 438 {
 439         int r;
 440         struct usb_int_header *hdr;
 441         struct zd_usb *usb;
 442         struct zd_usb_interrupt *intr;
 443
 444         switch (urb->status) {
 445         case 0:
 446                 break;
 447         case -ESHUTDOWN:
 448         case -EINVAL:
 449         case -ENODEV:
 450         case -ENOENT:
 451         case -ECONNRESET:
 452         case -EPIPE:
 453                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 454                 return;
 455         default:
 456                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 457                 goto resubmit;
 458         }
 459
 460         if (urb->actual_length < sizeof(hdr)) {
 461                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 462                 goto resubmit;
 463         }
 464
 465         hdr = urb->transfer_buffer;
 466         if (hdr->type != USB_INT_TYPE) {
 467                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 468                 goto resubmit;
 469         }
 470
 471         /* USB_INT_ID_RETRY_FAILED triggered by tx-urb submit can override
 472          * pending USB_INT_ID_REGS causing read command timeout.
 473          */
 474         usb = urb->context;
 475         intr = &usb->intr;
 476         if (hdr->id != USB_INT_ID_REGS && atomic_read(&intr->read_regs_enabled))
 477                 handle_regs_int_override(urb);
 478
 479         switch (hdr->id) {
 480         case USB_INT_ID_REGS:
 481                 handle_regs_int(urb);
 482                 break;
 483         case USB_INT_ID_RETRY_FAILED:
 484                 zd_mac_tx_failed(urb);
 485                 break;
 486         default:
 487                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 488                         (unsigned int)hdr->id);
 489                 goto resubmit;
 490         }
 491
 492 resubmit:
 493         r = usb_submit_urb(urb, GFP_ATOMIC);
 494         if (r) {
 495                 dev_dbg_f(urb_dev(urb), "error: resubmit urb %p err code %d\n",
 496                           urb, r);
 497                 /* TODO: add worker to reset intr->urb */
 498         }
 499         return;
 500 }
 501
 502 static inline int int_urb_interval(struct usb_device *udev)
 503 {
 504         switch (udev->speed) {
 505         case USB_SPEED_HIGH:
 506                 return 4;
 507         case USB_SPEED_LOW:
 508                 return 10;
 509         case USB_SPEED_FULL:
 510         default:
 511                 return 1;
 512         }
 513 }
 514
 515 static inline int usb_int_enabled(struct zd_usb *usb)
 516 {
 517         unsigned long flags;
 518         struct zd_usb_interrupt *intr = &usb->intr;
 519         struct urb *urb;
 520
 521         spin_lock_irqsave(&intr->lock, flags);
 522         urb = intr->urb;
 523         spin_unlock_irqrestore(&intr->lock, flags);
 524         return urb != NULL;
 525 }
 526
 527 int zd_usb_enable_int(struct zd_usb *usb)
 528 {
 529         int r;
 530         struct usb_device *udev = zd_usb_to_usbdev(usb);
 531         struct zd_usb_interrupt *intr = &usb->intr;
 532         struct urb *urb;
 533
 534         dev_dbg_f(zd_usb_dev(usb), "\n");
 535
 536         urb = usb_alloc_urb(0, GFP_KERNEL);
 537         if (!urb) {
 538                 r = -ENOMEM;
 539                 goto out;
 540         }
 541
 542         ZD_ASSERT(!irqs_disabled());
 543         spin_lock_irq(&intr->lock);
 544         if (intr->urb) {
 545                 spin_unlock_irq(&intr->lock);
 546                 r = 0;
 547                 goto error_free_urb;
 548         }
 549         intr->urb = urb;
 550         spin_unlock_irq(&intr->lock);
 551
 552         r = -ENOMEM;
 553         intr->buffer = usb_alloc_coherent(udev, USB_MAX_EP_INT_BUFFER,
 554                                           GFP_KERNEL, &intr->buffer_dma);
 555         if (!intr->buffer) {
 556                 dev_dbg_f(zd_usb_dev(usb),
 557                         "couldn't allocate transfer_buffer\n");
 558                 goto error_set_urb_null;
 559         }
 560
 561         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 562                          intr->buffer, USB_MAX_EP_INT_BUFFER,
 563                          int_urb_complete, usb,
 564                          intr->interval);
 565         urb->transfer_dma = intr->buffer_dma;
 566         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 567
 568         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 569         r = usb_submit_urb(urb, GFP_KERNEL);
 570         if (r) {
 571                 dev_dbg_f(zd_usb_dev(usb),
 572                          "Couldn't submit urb. Error number %d\n", r);
 573                 goto error;
 574         }
 575
 576         return 0;
 577 error:
 578         usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER,
 579                           intr->buffer, intr->buffer_dma);
 580 error_set_urb_null:
 581         spin_lock_irq(&intr->lock);
 582         intr->urb = NULL;
 583         spin_unlock_irq(&intr->lock);
 584 error_free_urb:
 585         usb_free_urb(urb);
 586 out:
 587         return r;
 588 }
 589
 590 void zd_usb_disable_int(struct zd_usb *usb)
 591 {
 592         unsigned long flags;
 593         struct usb_device *udev = zd_usb_to_usbdev(usb);
 594         struct zd_usb_interrupt *intr = &usb->intr;
 595         struct urb *urb;
 596         void *buffer;
 597         dma_addr_t buffer_dma;
 598
 599         spin_lock_irqsave(&intr->lock, flags);
 600         urb = intr->urb;
 601         if (!urb) {
 602                 spin_unlock_irqrestore(&intr->lock, flags);
 603                 return;
 604         }
 605         intr->urb = NULL;
 606         buffer = intr->buffer;
 607         buffer_dma = intr->buffer_dma;
 608         intr->buffer = NULL;
 609         spin_unlock_irqrestore(&intr->lock, flags);
 610
 611         usb_kill_urb(urb);
 612         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 613         usb_free_urb(urb);
 614
 615         if (buffer)
 616                 usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER,
 617                                   buffer, buffer_dma);
 618 }
 619
 620 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 621                              unsigned int length)
 622 {
 623         int i;
 624         const struct rx_length_info *length_info;
 625
 626         if (length < sizeof(struct rx_length_info)) {
 627                 /* It's not a complete packet anyhow. */
 628                 dev_dbg_f(zd_usb_dev(usb), "invalid, small RX packet : %d\n",
 629                                            length);
 630                 return;
 631         }
 632         length_info = (struct rx_length_info *)
 633                 (buffer + length - sizeof(struct rx_length_info));
 634
 635         /* It might be that three frames are merged into a single URB
 636          * transaction. We have to check for the length info tag.
 637          *
 638          * While testing we discovered that length_info might be unaligned,
 639          * because if USB transactions are merged, the last packet will not
 640          * be padded. Unaligned access might also happen if the length_info
 641          * structure is not present.
 642          */
 643         if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG)
 644         {
 645                 unsigned int l, k, n;
 646                 for (i = 0, l = 0;; i++) {
 647                         k = get_unaligned_le16(&length_info->length[i]);
 648                         if (k == 0)
 649                                 return;
 650                         n = l+k;
 651                         if (n > length)
 652                                 return;
 653                         zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
 654                         if (i >= 2)
 655                                 return;
 656                         l = (n+3) & ~3;
 657                 }
 658         } else {
 659                 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
 660         }
 661 }
 662
 663 static void rx_urb_complete(struct urb *urb)
 664 {
 665         int r;
 666         struct zd_usb *usb;
 667         struct zd_usb_rx *rx;
 668         const u8 *buffer;
 669         unsigned int length;
 670         unsigned long flags;
 671
 672         switch (urb->status) {
 673         case 0:
 674                 break;
 675         case -ESHUTDOWN:
 676         case -EINVAL:
 677         case -ENODEV:
 678         case -ENOENT:
 679         case -ECONNRESET:
 680         case -EPIPE:
 681                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 682                 return;
 683         default:
 684                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 685                 goto resubmit;
 686         }
 687
 688         buffer = urb->transfer_buffer;
 689         length = urb->actual_length;
 690         usb = urb->context;
 691         rx = &usb->rx;
 692
 693         tasklet_schedule(&rx->reset_timer_tasklet);
 694
 695         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 696                 /* If there is an old first fragment, we don't care. */
 697                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 698                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 699                 spin_lock_irqsave(&rx->lock, flags);
 700                 memcpy(rx->fragment, buffer, length);
 701                 rx->fragment_length = length;
 702                 spin_unlock_irqrestore(&rx->lock, flags);
 703                 goto resubmit;
 704         }
 705
 706         spin_lock_irqsave(&rx->lock, flags);
 707         if (rx->fragment_length > 0) {
 708                 /* We are on a second fragment, we believe */
 709                 ZD_ASSERT(length + rx->fragment_length <=
 710                           ARRAY_SIZE(rx->fragment));
 711                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 712                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 713                 handle_rx_packet(usb, rx->fragment,
 714                                  rx->fragment_length + length);
 715                 rx->fragment_length = 0;
 716                 spin_unlock_irqrestore(&rx->lock, flags);
 717         } else {
 718                 spin_unlock_irqrestore(&rx->lock, flags);
 719                 handle_rx_packet(usb, buffer, length);
 720         }
 721
 722 resubmit:
 723         r = usb_submit_urb(urb, GFP_ATOMIC);
 724         if (r)
 725                 dev_dbg_f(urb_dev(urb), "urb %p resubmit error %d\n", urb, r);
 726 }
 727
 728 static struct urb *alloc_rx_urb(struct zd_usb *usb)
 729 {
 730         struct usb_device *udev = zd_usb_to_usbdev(usb);
 731         struct urb *urb;
 732         void *buffer;
 733
 734         urb = usb_alloc_urb(0, GFP_KERNEL);
 735         if (!urb)
 736                 return NULL;
 737         buffer = usb_alloc_coherent(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
 738                                     &urb->transfer_dma);
 739         if (!buffer) {
 740                 usb_free_urb(urb);
 741                 return NULL;
 742         }
 743
 744         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 745                           buffer, USB_MAX_RX_SIZE,
 746                           rx_urb_complete, usb);
 747         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 748
 749         return urb;
 750 }
 751
 752 static void free_rx_urb(struct urb *urb)
 753 {
 754         if (!urb)
 755                 return;
 756         usb_free_coherent(urb->dev, urb->transfer_buffer_length,
 757                           urb->transfer_buffer, urb->transfer_dma);
 758         usb_free_urb(urb);
 759 }
 760
 761 static int __zd_usb_enable_rx(struct zd_usb *usb)
 762 {
 763         int i, r;
 764         struct zd_usb_rx *rx = &usb->rx;
 765         struct urb **urbs;
 766
 767         dev_dbg_f(zd_usb_dev(usb), "\n");
 768
 769         r = -ENOMEM;
 770         urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
 771         if (!urbs)
 772                 goto error;
 773         for (i = 0; i < RX_URBS_COUNT; i++) {
 774                 urbs[i] = alloc_rx_urb(usb);
 775                 if (!urbs[i])
 776                         goto error;
 777         }
 778
 779         ZD_ASSERT(!irqs_disabled());
 780         spin_lock_irq(&rx->lock);
 781         if (rx->urbs) {
 782                 spin_unlock_irq(&rx->lock);
 783                 r = 0;
 784                 goto error;
 785         }
 786         rx->urbs = urbs;
 787         rx->urbs_count = RX_URBS_COUNT;
 788         spin_unlock_irq(&rx->lock);
 789
 790         for (i = 0; i < RX_URBS_COUNT; i++) {
 791                 r = usb_submit_urb(urbs[i], GFP_KERNEL);
 792                 if (r)
 793                         goto error_submit;
 794         }
 795
 796         return 0;
 797 error_submit:
 798         for (i = 0; i < RX_URBS_COUNT; i++) {
 799                 usb_kill_urb(urbs[i]);
 800         }
 801         spin_lock_irq(&rx->lock);
 802         rx->urbs = NULL;
 803         rx->urbs_count = 0;
 804         spin_unlock_irq(&rx->lock);
 805 error:
 806         if (urbs) {
 807                 for (i = 0; i < RX_URBS_COUNT; i++)
 808                         free_rx_urb(urbs[i]);
 809         }
 810         return r;
 811 }
 812
 813 int zd_usb_enable_rx(struct zd_usb *usb)
 814 {
 815         int r;
 816         struct zd_usb_rx *rx = &usb->rx;
 817
 818         mutex_lock(&rx->setup_mutex);
 819         r = __zd_usb_enable_rx(usb);
 820         mutex_unlock(&rx->setup_mutex);
 821
 822         zd_usb_reset_rx_idle_timer(usb);
 823
 824         return r;
 825 }
 826
 827 static void __zd_usb_disable_rx(struct zd_usb *usb)
 828 {
 829         int i;
 830         unsigned long flags;
 831         struct urb **urbs;
 832         unsigned int count;
 833         struct zd_usb_rx *rx = &usb->rx;
 834
 835         spin_lock_irqsave(&rx->lock, flags);
 836         urbs = rx->urbs;
 837         count = rx->urbs_count;
 838         spin_unlock_irqrestore(&rx->lock, flags);
 839         if (!urbs)
 840                 return;
 841
 842         for (i = 0; i < count; i++) {
 843                 usb_kill_urb(urbs[i]);
 844                 free_rx_urb(urbs[i]);
 845         }
 846         kfree(urbs);
 847
 848         spin_lock_irqsave(&rx->lock, flags);
 849         rx->urbs = NULL;
 850         rx->urbs_count = 0;
 851         spin_unlock_irqrestore(&rx->lock, flags);
 852 }
 853
 854 void zd_usb_disable_rx(struct zd_usb *usb)
 855 {
 856         struct zd_usb_rx *rx = &usb->rx;
 857
 858         mutex_lock(&rx->setup_mutex);
 859         __zd_usb_disable_rx(usb);
 860         mutex_unlock(&rx->setup_mutex);
 861
 862         tasklet_kill(&rx->reset_timer_tasklet);
 863         cancel_delayed_work_sync(&rx->idle_work);
 864 }
 865
 866 static void zd_usb_reset_rx(struct zd_usb *usb)
 867 {
 868         bool do_reset;
 869         struct zd_usb_rx *rx = &usb->rx;
 870         unsigned long flags;
 871
 872         mutex_lock(&rx->setup_mutex);
 873
 874         spin_lock_irqsave(&rx->lock, flags);
 875         do_reset = rx->urbs != NULL;
 876         spin_unlock_irqrestore(&rx->lock, flags);
 877
 878         if (do_reset) {
 879                 __zd_usb_disable_rx(usb);
 880                 __zd_usb_enable_rx(usb);
 881         }
 882
 883         mutex_unlock(&rx->setup_mutex);
 884
 885         if (do_reset)
 886                 zd_usb_reset_rx_idle_timer(usb);
 887 }
 888
 889 /**
 890  * zd_usb_disable_tx - disable transmission
 891  * @usb: the zd1211rw-private USB structure
 892  *
 893  * Frees all URBs in the free list and marks the transmission as disabled.
 894  */
 895 void zd_usb_disable_tx(struct zd_usb *usb)
 896 {
 897         struct zd_usb_tx *tx = &usb->tx;
 898         unsigned long flags;
 899
 900         atomic_set(&tx->enabled, 0);
 901
 902         /* kill all submitted tx-urbs */
 903         usb_kill_anchored_urbs(&tx->submitted);
 904
 905         spin_lock_irqsave(&tx->lock, flags);
 906         WARN_ON(!skb_queue_empty(&tx->submitted_skbs));
 907         WARN_ON(tx->submitted_urbs != 0);
 908         tx->submitted_urbs = 0;
 909         spin_unlock_irqrestore(&tx->lock, flags);
 910
 911         /* The stopped state is ignored, relying on ieee80211_wake_queues()
 912          * in a potentionally following zd_usb_enable_tx().
 913          */
 914 }
 915
 916 /**
 917  * zd_usb_enable_tx - enables transmission
 918  * @usb: a &struct zd_usb pointer
 919  *
 920  * This function enables transmission and prepares the &zd_usb_tx data
 921  * structure.
 922  */
 923 void zd_usb_enable_tx(struct zd_usb *usb)
 924 {
 925         unsigned long flags;
 926         struct zd_usb_tx *tx = &usb->tx;
 927
 928         spin_lock_irqsave(&tx->lock, flags);
 929         atomic_set(&tx->enabled, 1);
 930         tx->submitted_urbs = 0;
 931         ieee80211_wake_queues(zd_usb_to_hw(usb));
 932         tx->stopped = 0;
 933         spin_unlock_irqrestore(&tx->lock, flags);
 934 }
 935
 936 static void tx_dec_submitted_urbs(struct zd_usb *usb)
 937 {
 938         struct zd_usb_tx *tx = &usb->tx;
 939         unsigned long flags;
 940
 941         spin_lock_irqsave(&tx->lock, flags);
 942         --tx->submitted_urbs;
 943         if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) {
 944                 ieee80211_wake_queues(zd_usb_to_hw(usb));
 945                 tx->stopped = 0;
 946         }
 947         spin_unlock_irqrestore(&tx->lock, flags);
 948 }
 949
 950 static void tx_inc_submitted_urbs(struct zd_usb *usb)
 951 {
 952         struct zd_usb_tx *tx = &usb->tx;
 953         unsigned long flags;
 954
 955         spin_lock_irqsave(&tx->lock, flags);
 956         ++tx->submitted_urbs;
 957         if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
 958                 ieee80211_stop_queues(zd_usb_to_hw(usb));
 959                 tx->stopped = 1;
 960         }
 961         spin_unlock_irqrestore(&tx->lock, flags);
 962 }
 963
 964 /**
 965  * tx_urb_complete - completes the execution of an URB
 966  * @urb: a URB
 967  *
 968  * This function is called if the URB has been transferred to a device or an
 969  * error has happened.
 970  */
 971 static void tx_urb_complete(struct urb *urb)
 972 {
 973         int r;
 974         struct sk_buff *skb;
 975         struct ieee80211_tx_info *info;
 976         struct zd_usb *usb;
 977         struct zd_usb_tx *tx;
 978
 979         skb = (struct sk_buff *)urb->context;
 980         info = IEEE80211_SKB_CB(skb);
 981         /*
 982          * grab 'usb' pointer before handing off the skb (since
 983          * it might be freed by zd_mac_tx_to_dev or mac80211)
 984          */
 985         usb = &zd_hw_mac(info->rate_driver_data[0])->chip.usb;
 986         tx = &usb->tx;
 987
 988         switch (urb->status) {
 989         case 0:
 990                 break;
 991         case -ESHUTDOWN:
 992         case -EINVAL:
 993         case -ENODEV:
 994         case -ENOENT:
 995         case -ECONNRESET:
 996         case -EPIPE:
 997                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 998                 break;
 999         default:
1000                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
1001                 goto resubmit;
1002         }
1003 free_urb:
1004         skb_unlink(skb, &usb->tx.submitted_skbs);
1005         zd_mac_tx_to_dev(skb, urb->status);
1006         usb_free_urb(urb);
1007         tx_dec_submitted_urbs(usb);
1008         return;
1009 resubmit:
1010         usb_anchor_urb(urb, &tx->submitted);
1011         r = usb_submit_urb(urb, GFP_ATOMIC);
1012         if (r) {
1013                 usb_unanchor_urb(urb);
1014                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
1015                 goto free_urb;
1016         }
1017 }
1018
1019 /**
1020  * zd_usb_tx: initiates transfer of a frame of the device
1021  *
1022  * @usb: the zd1211rw-private USB structure
1023  * @skb: a &struct sk_buff pointer
1024  *
1025  * This function tranmits a frame to the device. It doesn't wait for
1026  * completion. The frame must contain the control set and have all the
1027  * control set information available.
1028  *
1029  * The function returns 0 if the transfer has been successfully initiated.
1030  */
1031 int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
1032 {
1033         int r;
1034         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1035         struct usb_device *udev = zd_usb_to_usbdev(usb);
1036         struct urb *urb;
1037         struct zd_usb_tx *tx = &usb->tx;
1038
1039         if (!atomic_read(&tx->enabled)) {
1040                 r = -ENOENT;
1041                 goto out;
1042         }
1043
1044         urb = usb_alloc_urb(0, GFP_ATOMIC);
1045         if (!urb) {
1046                 r = -ENOMEM;
1047                 goto out;
1048         }
1049
1050         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
1051                           skb->data, skb->len, tx_urb_complete, skb);
1052
1053         info->rate_driver_data[1] = (void *)jiffies;
1054         skb_queue_tail(&tx->submitted_skbs, skb);
1055         usb_anchor_urb(urb, &tx->submitted);
1056
1057         r = usb_submit_urb(urb, GFP_ATOMIC);
1058         if (r) {
1059                 dev_dbg_f(zd_usb_dev(usb), "error submit urb %p %d\n", urb, r);
1060                 usb_unanchor_urb(urb);
1061                 skb_unlink(skb, &tx->submitted_skbs);
1062                 goto error;
1063         }
1064         tx_inc_submitted_urbs(usb);
1065         return 0;
1066 error:
1067         usb_free_urb(urb);
1068 out:
1069         return r;
1070 }
1071
1072 static bool zd_tx_timeout(struct zd_usb *usb)
1073 {
1074         struct zd_usb_tx *tx = &usb->tx;
1075         struct sk_buff_head *q = &tx->submitted_skbs;
1076         struct sk_buff *skb, *skbnext;
1077         struct ieee80211_tx_info *info;
1078         unsigned long flags, trans_start;
1079         bool have_timedout = false;
1080
1081         spin_lock_irqsave(&q->lock, flags);
1082         skb_queue_walk_safe(q, skb, skbnext) {
1083                 info = IEEE80211_SKB_CB(skb);
1084                 trans_start = (unsigned long)info->rate_driver_data[1];
1085
1086                 if (time_is_before_jiffies(trans_start + ZD_TX_TIMEOUT)) {
1087                         have_timedout = true;
1088                         break;
1089                 }
1090         }
1091         spin_unlock_irqrestore(&q->lock, flags);
1092
1093         return have_timedout;
1094 }
1095
1096 static void zd_tx_watchdog_handler(struct work_struct *work)
1097 {
1098         struct zd_usb *usb =
1099                 container_of(work, struct zd_usb, tx.watchdog_work.work);
1100         struct zd_usb_tx *tx = &usb->tx;
1101
1102         if (!atomic_read(&tx->enabled) || !tx->watchdog_enabled)
1103                 goto out;
1104         if (!zd_tx_timeout(usb))
1105                 goto out;
1106
1107         /* TX halted, try reset */
1108         dev_warn(zd_usb_dev(usb), "TX-stall detected, resetting device...");
1109
1110         usb_queue_reset_device(usb->intf);
1111
1112         /* reset will stop this worker, don't rearm */
1113         return;
1114 out:
1115         queue_delayed_work(zd_workqueue, &tx->watchdog_work,
1116                            ZD_TX_WATCHDOG_INTERVAL);
1117 }
1118
1119 void zd_tx_watchdog_enable(struct zd_usb *usb)
1120 {
1121         struct zd_usb_tx *tx = &usb->tx;
1122
1123         if (!tx->watchdog_enabled) {
1124                 dev_dbg_f(zd_usb_dev(usb), "\n");
1125                 queue_delayed_work(zd_workqueue, &tx->watchdog_work,
1126                                    ZD_TX_WATCHDOG_INTERVAL);
1127                 tx->watchdog_enabled = 1;
1128         }
1129 }
1130
1131 void zd_tx_watchdog_disable(struct zd_usb *usb)
1132 {
1133         struct zd_usb_tx *tx = &usb->tx;
1134
1135         if (tx->watchdog_enabled) {
1136                 dev_dbg_f(zd_usb_dev(usb), "\n");
1137                 tx->watchdog_enabled = 0;
1138                 cancel_delayed_work_sync(&tx->watchdog_work);
1139         }
1140 }
1141
1142 static void zd_rx_idle_timer_handler(struct work_struct *work)
1143 {
1144         struct zd_usb *usb =
1145                 container_of(work, struct zd_usb, rx.idle_work.work);
1146         struct zd_mac *mac = zd_usb_to_mac(usb);
1147
1148         if (!test_bit(ZD_DEVICE_RUNNING, &mac->flags))
1149                 return;
1150
1151         dev_dbg_f(zd_usb_dev(usb), "\n");
1152
1153         /* 30 seconds since last rx, reset rx */
1154         zd_usb_reset_rx(usb);
1155 }
1156
1157 static void zd_usb_reset_rx_idle_timer_tasklet(unsigned long param)
1158 {
1159         struct zd_usb *usb = (struct zd_usb *)param;
1160
1161         zd_usb_reset_rx_idle_timer(usb);
1162 }
1163
1164 void zd_usb_reset_rx_idle_timer(struct zd_usb *usb)
1165 {
1166         struct zd_usb_rx *rx = &usb->rx;
1167
1168         mod_delayed_work(zd_workqueue, &rx->idle_work, ZD_RX_IDLE_INTERVAL);
1169 }
1170
1171 static inline void init_usb_interrupt(struct zd_usb *usb)
1172 {
1173         struct zd_usb_interrupt *intr = &usb->intr;
1174
1175         spin_lock_init(&intr->lock);
1176         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
1177         init_completion(&intr->read_regs.completion);
1178         atomic_set(&intr->read_regs_enabled, 0);
1179         intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
1180 }
1181
1182 static inline void init_usb_rx(struct zd_usb *usb)
1183 {
1184         struct zd_usb_rx *rx = &usb->rx;
1185
1186         spin_lock_init(&rx->lock);
1187         mutex_init(&rx->setup_mutex);
1188         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
1189                 rx->usb_packet_size = 512;
1190         } else {
1191                 rx->usb_packet_size = 64;
1192         }
1193         ZD_ASSERT(rx->fragment_length == 0);
1194         INIT_DELAYED_WORK(&rx->idle_work, zd_rx_idle_timer_handler);
1195         rx->reset_timer_tasklet.func = zd_usb_reset_rx_idle_timer_tasklet;
1196         rx->reset_timer_tasklet.data = (unsigned long)usb;
1197 }
1198
1199 static inline void init_usb_tx(struct zd_usb *usb)
1200 {
1201         struct zd_usb_tx *tx = &usb->tx;
1202
1203         spin_lock_init(&tx->lock);
1204         atomic_set(&tx->enabled, 0);
1205         tx->stopped = 0;
1206         skb_queue_head_init(&tx->submitted_skbs);
1207         init_usb_anchor(&tx->submitted);
1208         tx->submitted_urbs = 0;
1209         tx->watchdog_enabled = 0;
1210         INIT_DELAYED_WORK(&tx->watchdog_work, zd_tx_watchdog_handler);
1211 }
1212
1213 void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
1214                  struct usb_interface *intf)
1215 {
1216         memset(usb, 0, sizeof(*usb));
1217         usb->intf = usb_get_intf(intf);
1218         usb_set_intfdata(usb->intf, hw);
1219         init_usb_anchor(&usb->submitted_cmds);
1220         init_usb_interrupt(usb);
1221         init_usb_tx(usb);
1222         init_usb_rx(usb);
1223 }
1224
1225 void zd_usb_clear(struct zd_usb *usb)
1226 {
1227         usb_set_intfdata(usb->intf, NULL);
1228         usb_put_intf(usb->intf);
1229         ZD_MEMCLEAR(usb, sizeof(*usb));
1230         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
1231 }
1232
1233 static const char *speed(enum usb_device_speed speed)
1234 {
1235         switch (speed) {
1236         case USB_SPEED_LOW:
1237                 return "low";
1238         case USB_SPEED_FULL:
1239                 return "full";
1240         case USB_SPEED_HIGH:
1241                 return "high";
1242         default:
1243                 return "unknown speed";
1244         }
1245 }
1246
1247 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
1248 {
1249         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1250                 le16_to_cpu(udev->descriptor.idVendor),
1251                 le16_to_cpu(udev->descriptor.idProduct),
1252                 get_bcdDevice(udev),
1253                 speed(udev->speed));
1254 }
1255
1256 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1257 {
1258         struct usb_device *udev = interface_to_usbdev(usb->intf);
1259         return scnprint_id(udev, buffer, size);
1260 }
1261
1262 #ifdef DEBUG
1263 static void print_id(struct usb_device *udev)
1264 {
1265         char buffer[40];
1266
1267         scnprint_id(udev, buffer, sizeof(buffer));
1268         buffer[sizeof(buffer)-1] = 0;
1269         dev_dbg_f(&udev->dev, "%s\n", buffer);
1270 }
1271 #else
1272 #define print_id(udev) do { } while (0)
1273 #endif
1274
1275 static int eject_installer(struct usb_interface *intf)
1276 {
1277         struct usb_device *udev = interface_to_usbdev(intf);
1278         struct usb_host_interface *iface_desc = &intf->altsetting[0];
1279         struct usb_endpoint_descriptor *endpoint;
1280         unsigned char *cmd;
1281         u8 bulk_out_ep;
1282         int r;
1283
1284         if (iface_desc->desc.bNumEndpoints < 2)
1285                 return -ENODEV;
1286
1287         /* Find bulk out endpoint */
1288         for (r = 1; r >= 0; r--) {
1289                 endpoint = &iface_desc->endpoint[r].desc;
1290                 if (usb_endpoint_dir_out(endpoint) &&
1291                     usb_endpoint_xfer_bulk(endpoint)) {
1292                         bulk_out_ep = endpoint->bEndpointAddress;
1293                         break;
1294                 }
1295         }
1296         if (r == -1) {
1297                 dev_err(&udev->dev,
1298                         "zd1211rw: Could not find bulk out endpoint\n");
1299                 return -ENODEV;
1300         }
1301
1302         cmd = kzalloc(31, GFP_KERNEL);
1303         if (cmd == NULL)
1304                 return -ENODEV;
1305
1306         /* USB bulk command block */
1307         cmd[0] = 0x55;  /* bulk command signature */
1308         cmd[1] = 0x53;  /* bulk command signature */
1309         cmd[2] = 0x42;  /* bulk command signature */
1310         cmd[3] = 0x43;  /* bulk command signature */
1311         cmd[14] = 6;    /* command length */
1312
1313         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1314         cmd[19] = 0x2;  /* eject disc */
1315
1316         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1317         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1318                 cmd, 31, NULL, 2000);
1319         kfree(cmd);
1320         if (r)
1321                 return r;
1322
1323         /* At this point, the device disconnects and reconnects with the real
1324          * ID numbers. */
1325
1326         usb_set_intfdata(intf, NULL);
1327         return 0;
1328 }
1329
1330 int zd_usb_init_hw(struct zd_usb *usb)
1331 {
1332         int r;
1333         struct zd_mac *mac = zd_usb_to_mac(usb);
1334
1335         dev_dbg_f(zd_usb_dev(usb), "\n");
1336
1337         r = upload_firmware(usb);
1338         if (r) {
1339                 dev_err(zd_usb_dev(usb),
1340                        "couldn't load firmware. Error number %d\n", r);
1341                 return r;
1342         }
1343
1344         r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1345         if (r) {
1346                 dev_dbg_f(zd_usb_dev(usb),
1347                         "couldn't reset configuration. Error number %d\n", r);
1348                 return r;
1349         }
1350
1351         r = zd_mac_init_hw(mac->hw);
1352         if (r) {
1353                 dev_dbg_f(zd_usb_dev(usb),
1354                          "couldn't initialize mac. Error number %d\n", r);
1355                 return r;
1356         }
1357
1358         usb->initialized = 1;
1359         return 0;
1360 }
1361
1362 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1363 {
1364         int r;
1365         struct usb_device *udev = interface_to_usbdev(intf);
1366         struct zd_usb *usb;
1367         struct ieee80211_hw *hw = NULL;
1368
1369         print_id(udev);
1370
1371         if (id->driver_info & DEVICE_INSTALLER)
1372                 return eject_installer(intf);
1373
1374         switch (udev->speed) {
1375         case USB_SPEED_LOW:
1376         case USB_SPEED_FULL:
1377         case USB_SPEED_HIGH:
1378                 break;
1379         default:
1380                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1381                 r = -ENODEV;
1382                 goto error;
1383         }
1384
1385         r = usb_reset_device(udev);
1386         if (r) {
1387                 dev_err(&intf->dev,
1388                         "couldn't reset usb device. Error number %d\n", r);
1389                 goto error;
1390         }
1391
1392         hw = zd_mac_alloc_hw(intf);
1393         if (hw == NULL) {
1394                 r = -ENOMEM;
1395                 goto error;
1396         }
1397
1398         usb = &zd_hw_mac(hw)->chip.usb;
1399         usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1400
1401         r = zd_mac_preinit_hw(hw);
1402         if (r) {
1403                 dev_dbg_f(&intf->dev,
1404                          "couldn't initialize mac. Error number %d\n", r);
1405                 goto error;
1406         }
1407
1408         r = ieee80211_register_hw(hw);
1409         if (r) {
1410                 dev_dbg_f(&intf->dev,
1411                          "couldn't register device. Error number %d\n", r);
1412                 goto error;
1413         }
1414
1415         dev_dbg_f(&intf->dev, "successful\n");
1416         dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
1417         return 0;
1418 error:
1419         usb_reset_device(interface_to_usbdev(intf));
1420         if (hw) {
1421                 zd_mac_clear(zd_hw_mac(hw));
1422                 ieee80211_free_hw(hw);
1423         }
1424         return r;
1425 }
1426
1427 static void disconnect(struct usb_interface *intf)
1428 {
1429         struct ieee80211_hw *hw = zd_intf_to_hw(intf);
1430         struct zd_mac *mac;
1431         struct zd_usb *usb;
1432
1433         /* Either something really bad happened, or we're just dealing with
1434          * a DEVICE_INSTALLER. */
1435         if (hw == NULL)
1436                 return;
1437
1438         mac = zd_hw_mac(hw);
1439         usb = &mac->chip.usb;
1440
1441         dev_dbg_f(zd_usb_dev(usb), "\n");
1442
1443         ieee80211_unregister_hw(hw);
1444
1445         /* Just in case something has gone wrong! */
1446         zd_usb_disable_tx(usb);
1447         zd_usb_disable_rx(usb);
1448         zd_usb_disable_int(usb);
1449
1450         /* If the disconnect has been caused by a removal of the
1451          * driver module, the reset allows reloading of the driver. If the
1452          * reset will not be executed here, the upload of the firmware in the
1453          * probe function caused by the reloading of the driver will fail.
1454          */
1455         usb_reset_device(interface_to_usbdev(intf));
1456
1457         zd_mac_clear(mac);
1458         ieee80211_free_hw(hw);
1459         dev_dbg(&intf->dev, "disconnected\n");
1460 }
1461
1462 static void zd_usb_resume(struct zd_usb *usb)
1463 {
1464         struct zd_mac *mac = zd_usb_to_mac(usb);
1465         int r;
1466
1467         dev_dbg_f(zd_usb_dev(usb), "\n");
1468
1469         r = zd_op_start(zd_usb_to_hw(usb));
1470         if (r < 0) {
1471                 dev_warn(zd_usb_dev(usb), "Device resume failed "
1472                          "with error code %d. Retrying...\n", r);
1473                 if (usb->was_running)
1474                         set_bit(ZD_DEVICE_RUNNING, &mac->flags);
1475                 usb_queue_reset_device(usb->intf);
1476                 return;
1477         }
1478
1479         if (mac->type != NL80211_IFTYPE_UNSPECIFIED) {
1480                 r = zd_restore_settings(mac);
1481                 if (r < 0) {
1482                         dev_dbg(zd_usb_dev(usb),
1483                                 "failed to restore settings, %d\n", r);
1484                         return;
1485                 }
1486         }
1487 }
1488
1489 static void zd_usb_stop(struct zd_usb *usb)
1490 {
1491         dev_dbg_f(zd_usb_dev(usb), "\n");
1492
1493         zd_op_stop(zd_usb_to_hw(usb));
1494
1495         zd_usb_disable_tx(usb);
1496         zd_usb_disable_rx(usb);
1497         zd_usb_disable_int(usb);
1498
1499         usb->initialized = 0;
1500 }
1501
1502 static int pre_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         usb->was_running = test_bit(ZD_DEVICE_RUNNING, &mac->flags);
1515
1516         zd_usb_stop(usb);
1517
1518         mutex_lock(&mac->chip.mutex);
1519         return 0;
1520 }
1521
1522 static int post_reset(struct usb_interface *intf)
1523 {
1524         struct ieee80211_hw *hw = usb_get_intfdata(intf);
1525         struct zd_mac *mac;
1526         struct zd_usb *usb;
1527
1528         if (!hw || intf->condition != USB_INTERFACE_BOUND)
1529                 return 0;
1530
1531         mac = zd_hw_mac(hw);
1532         usb = &mac->chip.usb;
1533
1534         mutex_unlock(&mac->chip.mutex);
1535
1536         if (usb->was_running)
1537                 zd_usb_resume(usb);
1538         return 0;
1539 }
1540
1541 static struct usb_driver driver = {
1542         .name           = KBUILD_MODNAME,
1543         .id_table       = usb_ids,
1544         .probe          = probe,
1545         .disconnect     = disconnect,
1546         .pre_reset      = pre_reset,
1547         .post_reset     = post_reset,
1548         .disable_hub_initiated_lpm = 1,
1549 };
1550
1551 struct workqueue_struct *zd_workqueue;
1552
1553 static int __init usb_init(void)
1554 {
1555         int r;
1556
1557         pr_debug("%s usb_init()\n", driver.name);
1558
1559         zd_workqueue = create_singlethread_workqueue(driver.name);
1560         if (zd_workqueue == NULL) {
1561                 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1562                 return -ENOMEM;
1563         }
1564
1565         r = usb_register(&driver);
1566         if (r) {
1567                 destroy_workqueue(zd_workqueue);
1568                 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1569                        driver.name, r);
1570                 return r;
1571         }
1572
1573         pr_debug("%s initialized\n", driver.name);
1574         return 0;
1575 }
1576
1577 static void __exit usb_exit(void)
1578 {
1579         pr_debug("%s usb_exit()\n", driver.name);
1580         usb_deregister(&driver);
1581         destroy_workqueue(zd_workqueue);
1582 }
1583
1584 module_init(usb_init);
1585 module_exit(usb_exit);
1586
1587 static int zd_ep_regs_out_msg(struct usb_device *udev, void *data, int len,
1588                               int *actual_length, int timeout)
1589 {
1590         /* In USB 2.0 mode EP_REGS_OUT endpoint is interrupt type. However in
1591          * USB 1.1 mode endpoint is bulk. Select correct type URB by endpoint
1592          * descriptor.
1593          */
1594         struct usb_host_endpoint *ep;
1595         unsigned int pipe;
1596
1597         pipe = usb_sndintpipe(udev, EP_REGS_OUT);
1598         ep = usb_pipe_endpoint(udev, pipe);
1599         if (!ep)
1600                 return -EINVAL;
1601
1602         if (usb_endpoint_xfer_int(&ep->desc)) {
1603                 return usb_interrupt_msg(udev, pipe, data, len,
1604                                          actual_length, timeout);
1605         } else {
1606                 pipe = usb_sndbulkpipe(udev, EP_REGS_OUT);
1607                 return usb_bulk_msg(udev, pipe, data, len, actual_length,
1608                                     timeout);
1609         }
1610 }
1611
1612 static int usb_int_regs_length(unsigned int count)
1613 {
1614         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1615 }
1616
1617 static void prepare_read_regs_int(struct zd_usb *usb,
1618                                   struct usb_req_read_regs *req,
1619                                   unsigned int count)
1620 {
1621         struct zd_usb_interrupt *intr = &usb->intr;
1622
1623         spin_lock_irq(&intr->lock);
1624         atomic_set(&intr->read_regs_enabled, 1);
1625         intr->read_regs.req = req;
1626         intr->read_regs.req_count = count;
1627         reinit_completion(&intr->read_regs.completion);
1628         spin_unlock_irq(&intr->lock);
1629 }
1630
1631 static void disable_read_regs_int(struct zd_usb *usb)
1632 {
1633         struct zd_usb_interrupt *intr = &usb->intr;
1634
1635         spin_lock_irq(&intr->lock);
1636         atomic_set(&intr->read_regs_enabled, 0);
1637         spin_unlock_irq(&intr->lock);
1638 }
1639
1640 static bool check_read_regs(struct zd_usb *usb, struct usb_req_read_regs *req,
1641                             unsigned int count)
1642 {
1643         int i;
1644         struct zd_usb_interrupt *intr = &usb->intr;
1645         struct read_regs_int *rr = &intr->read_regs;
1646         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1647
1648         /* The created block size seems to be larger than expected.
1649          * However results appear to be correct.
1650          */
1651         if (rr->length < usb_int_regs_length(count)) {
1652                 dev_dbg_f(zd_usb_dev(usb),
1653                          "error: actual length %d less than expected %d\n",
1654                          rr->length, usb_int_regs_length(count));
1655                 return false;
1656         }
1657
1658         if (rr->length > sizeof(rr->buffer)) {
1659                 dev_dbg_f(zd_usb_dev(usb),
1660                          "error: actual length %d exceeds buffer size %zu\n",
1661                          rr->length, sizeof(rr->buffer));
1662                 return false;
1663         }
1664
1665         for (i = 0; i < count; i++) {
1666                 struct reg_data *rd = &regs->regs[i];
1667                 if (rd->addr != req->addr[i]) {
1668                         dev_dbg_f(zd_usb_dev(usb),
1669                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1670                                  le16_to_cpu(rd->addr),
1671                                  le16_to_cpu(req->addr[i]));
1672                         return false;
1673                 }
1674         }
1675
1676         return true;
1677 }
1678
1679 static int get_results(struct zd_usb *usb, u16 *values,
1680                        struct usb_req_read_regs *req, unsigned int count,
1681                        bool *retry)
1682 {
1683         int r;
1684         int i;
1685         struct zd_usb_interrupt *intr = &usb->intr;
1686         struct read_regs_int *rr = &intr->read_regs;
1687         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1688
1689         spin_lock_irq(&intr->lock);
1690
1691         r = -EIO;
1692
1693         /* Read failed because firmware bug? */
1694         *retry = !!intr->read_regs_int_overridden;
1695         if (*retry)
1696                 goto error_unlock;
1697
1698         if (!check_read_regs(usb, req, count)) {
1699                 dev_dbg_f(zd_usb_dev(usb), "error: invalid read regs\n");
1700                 goto error_unlock;
1701         }
1702
1703         for (i = 0; i < count; i++) {
1704                 struct reg_data *rd = &regs->regs[i];
1705                 values[i] = le16_to_cpu(rd->value);
1706         }
1707
1708         r = 0;
1709 error_unlock:
1710         spin_unlock_irq(&intr->lock);
1711         return r;
1712 }
1713
1714 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1715                      const zd_addr_t *addresses, unsigned int count)
1716 {
1717         int r, i, req_len, actual_req_len, try_count = 0;
1718         struct usb_device *udev;
1719         struct usb_req_read_regs *req = NULL;
1720         unsigned long timeout;
1721         bool retry = false;
1722
1723         if (count < 1) {
1724                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1725                 return -EINVAL;
1726         }
1727         if (count > USB_MAX_IOREAD16_COUNT) {
1728                 dev_dbg_f(zd_usb_dev(usb),
1729                          "error: count %u exceeds possible max %u\n",
1730                          count, USB_MAX_IOREAD16_COUNT);
1731                 return -EINVAL;
1732         }
1733         if (in_atomic()) {
1734                 dev_dbg_f(zd_usb_dev(usb),
1735                          "error: io in atomic context not supported\n");
1736                 return -EWOULDBLOCK;
1737         }
1738         if (!usb_int_enabled(usb)) {
1739                 dev_dbg_f(zd_usb_dev(usb),
1740                           "error: usb interrupt not enabled\n");
1741                 return -EWOULDBLOCK;
1742         }
1743
1744         ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1745         BUILD_BUG_ON(sizeof(struct usb_req_read_regs) + USB_MAX_IOREAD16_COUNT *
1746                      sizeof(__le16) > sizeof(usb->req_buf));
1747         BUG_ON(sizeof(struct usb_req_read_regs) + count * sizeof(__le16) >
1748                sizeof(usb->req_buf));
1749
1750         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1751         req = (void *)usb->req_buf;
1752
1753         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1754         for (i = 0; i < count; i++)
1755                 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1756
1757 retry_read:
1758         try_count++;
1759         udev = zd_usb_to_usbdev(usb);
1760         prepare_read_regs_int(usb, req, count);
1761         r = zd_ep_regs_out_msg(udev, req, req_len, &actual_req_len, 50 /*ms*/);
1762         if (r) {
1763                 dev_dbg_f(zd_usb_dev(usb),
1764                         "error in zd_ep_regs_out_msg(). Error number %d\n", r);
1765                 goto error;
1766         }
1767         if (req_len != actual_req_len) {
1768                 dev_dbg_f(zd_usb_dev(usb), "error in zd_ep_regs_out_msg()\n"
1769                         " req_len %d != actual_req_len %d\n",
1770                         req_len, actual_req_len);
1771                 r = -EIO;
1772                 goto error;
1773         }
1774
1775         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1776                                               msecs_to_jiffies(50));
1777         if (!timeout) {
1778                 disable_read_regs_int(usb);
1779                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1780                 r = -ETIMEDOUT;
1781                 goto error;
1782         }
1783
1784         r = get_results(usb, values, req, count, &retry);
1785         if (retry && try_count < 20) {
1786                 dev_dbg_f(zd_usb_dev(usb), "read retry, tries so far: %d\n",
1787                                 try_count);
1788                 goto retry_read;
1789         }
1790 error:
1791         return r;
1792 }
1793
1794 static void iowrite16v_urb_complete(struct urb *urb)
1795 {
1796         struct zd_usb *usb = urb->context;
1797
1798         if (urb->status && !usb->cmd_error)
1799                 usb->cmd_error = urb->status;
1800
1801         if (!usb->cmd_error &&
1802                         urb->actual_length != urb->transfer_buffer_length)
1803                 usb->cmd_error = -EIO;
1804 }
1805
1806 static int zd_submit_waiting_urb(struct zd_usb *usb, bool last)
1807 {
1808         int r = 0;
1809         struct urb *urb = usb->urb_async_waiting;
1810
1811         if (!urb)
1812                 return 0;
1813
1814         usb->urb_async_waiting = NULL;
1815
1816         if (!last)
1817                 urb->transfer_flags |= URB_NO_INTERRUPT;
1818
1819         usb_anchor_urb(urb, &usb->submitted_cmds);
1820         r = usb_submit_urb(urb, GFP_KERNEL);
1821         if (r) {
1822                 usb_unanchor_urb(urb);
1823                 dev_dbg_f(zd_usb_dev(usb),
1824                         "error in usb_submit_urb(). Error number %d\n", r);
1825                 goto error;
1826         }
1827
1828         /* fall-through with r == 0 */
1829 error:
1830         usb_free_urb(urb);
1831         return r;
1832 }
1833
1834 void zd_usb_iowrite16v_async_start(struct zd_usb *usb)
1835 {
1836         ZD_ASSERT(usb_anchor_empty(&usb->submitted_cmds));
1837         ZD_ASSERT(usb->urb_async_waiting == NULL);
1838         ZD_ASSERT(!usb->in_async);
1839
1840         ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1841
1842         usb->in_async = 1;
1843         usb->cmd_error = 0;
1844         usb->urb_async_waiting = NULL;
1845 }
1846
1847 int zd_usb_iowrite16v_async_end(struct zd_usb *usb, unsigned int timeout)
1848 {
1849         int r;
1850
1851         ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1852         ZD_ASSERT(usb->in_async);
1853
1854         /* Submit last iowrite16v URB */
1855         r = zd_submit_waiting_urb(usb, true);
1856         if (r) {
1857                 dev_dbg_f(zd_usb_dev(usb),
1858                         "error in zd_submit_waiting_usb(). "
1859                         "Error number %d\n", r);
1860
1861                 usb_kill_anchored_urbs(&usb->submitted_cmds);
1862                 goto error;
1863         }
1864
1865         if (timeout)
1866                 timeout = usb_wait_anchor_empty_timeout(&usb->submitted_cmds,
1867                                                         timeout);
1868         if (!timeout) {
1869                 usb_kill_anchored_urbs(&usb->submitted_cmds);
1870                 if (usb->cmd_error == -ENOENT) {
1871                         dev_dbg_f(zd_usb_dev(usb), "timed out");
1872                         r = -ETIMEDOUT;
1873                         goto error;
1874                 }
1875         }
1876
1877         r = usb->cmd_error;
1878 error:
1879         usb->in_async = 0;
1880         return r;
1881 }
1882
1883 int zd_usb_iowrite16v_async(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1884                             unsigned int count)
1885 {
1886         int r;
1887         struct usb_device *udev;
1888         struct usb_req_write_regs *req = NULL;
1889         int i, req_len;
1890         struct urb *urb;
1891         struct usb_host_endpoint *ep;
1892
1893         ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1894         ZD_ASSERT(usb->in_async);
1895
1896         if (count == 0)
1897                 return 0;
1898         if (count > USB_MAX_IOWRITE16_COUNT) {
1899                 dev_dbg_f(zd_usb_dev(usb),
1900                         "error: count %u exceeds possible max %u\n",
1901                         count, USB_MAX_IOWRITE16_COUNT);
1902                 return -EINVAL;
1903         }
1904         if (in_atomic()) {
1905                 dev_dbg_f(zd_usb_dev(usb),
1906                         "error: io in atomic context not supported\n");
1907                 return -EWOULDBLOCK;
1908         }
1909
1910         udev = zd_usb_to_usbdev(usb);
1911
1912         ep = usb_pipe_endpoint(udev, usb_sndintpipe(udev, EP_REGS_OUT));
1913         if (!ep)
1914                 return -ENOENT;
1915
1916         urb = usb_alloc_urb(0, GFP_KERNEL);
1917         if (!urb)
1918                 return -ENOMEM;
1919
1920         req_len = struct_size(req, reg_writes, count);
1921         req = kmalloc(req_len, GFP_KERNEL);
1922         if (!req) {
1923                 r = -ENOMEM;
1924                 goto error;
1925         }
1926
1927         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1928         for (i = 0; i < count; i++) {
1929                 struct reg_data *rw  = &req->reg_writes[i];
1930                 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1931                 rw->value = cpu_to_le16(ioreqs[i].value);
1932         }
1933
1934         /* In USB 2.0 mode endpoint is interrupt type. However in USB 1.1 mode
1935          * endpoint is bulk. Select correct type URB by endpoint descriptor.
1936          */
1937         if (usb_endpoint_xfer_int(&ep->desc))
1938                 usb_fill_int_urb(urb, udev, usb_sndintpipe(udev, EP_REGS_OUT),
1939                                  req, req_len, iowrite16v_urb_complete, usb,
1940                                  ep->desc.bInterval);
1941         else
1942                 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1943                                   req, req_len, iowrite16v_urb_complete, usb);
1944
1945         urb->transfer_flags |= URB_FREE_BUFFER;
1946
1947         /* Submit previous URB */
1948         r = zd_submit_waiting_urb(usb, false);
1949         if (r) {
1950                 dev_dbg_f(zd_usb_dev(usb),
1951                         "error in zd_submit_waiting_usb(). "
1952                         "Error number %d\n", r);
1953                 goto error;
1954         }
1955
1956         /* Delay submit so that URB_NO_INTERRUPT flag can be set for all URBs
1957          * of currect batch except for very last.
1958          */
1959         usb->urb_async_waiting = urb;
1960         return 0;
1961 error:
1962         usb_free_urb(urb);
1963         return r;
1964 }
1965
1966 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1967                         unsigned int count)
1968 {
1969         int r;
1970
1971         zd_usb_iowrite16v_async_start(usb);
1972         r = zd_usb_iowrite16v_async(usb, ioreqs, count);
1973         if (r) {
1974                 zd_usb_iowrite16v_async_end(usb, 0);
1975                 return r;
1976         }
1977         return zd_usb_iowrite16v_async_end(usb, 50 /* ms */);
1978 }
1979
1980 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1981 {
1982         int r;
1983         struct usb_device *udev;
1984         struct usb_req_rfwrite *req = NULL;
1985         int i, req_len, actual_req_len;
1986         u16 bit_value_template;
1987
1988         if (in_atomic()) {
1989                 dev_dbg_f(zd_usb_dev(usb),
1990                         "error: io in atomic context not supported\n");
1991                 return -EWOULDBLOCK;
1992         }
1993         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1994                 dev_dbg_f(zd_usb_dev(usb),
1995                         "error: bits %d are smaller than"
1996                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1997                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1998                 return -EINVAL;
1999         }
2000         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
2001                 dev_dbg_f(zd_usb_dev(usb),
2002                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
2003                         bits, USB_MAX_RFWRITE_BIT_COUNT);
2004                 return -EINVAL;
2005         }
2006 #ifdef DEBUG
2007         if (value & (~0UL << bits)) {
2008                 dev_dbg_f(zd_usb_dev(usb),
2009                         "error: value %#09x has bits >= %d set\n",
2010                         value, bits);
2011                 return -EINVAL;
2012         }
2013 #endif /* DEBUG */
2014
2015         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
2016
2017         r = zd_usb_ioread16(usb, &bit_value_template, ZD_CR203);
2018         if (r) {
2019                 dev_dbg_f(zd_usb_dev(usb),
2020                         "error %d: Couldn't read ZD_CR203\n", r);
2021                 return r;
2022         }
2023         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
2024
2025         ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
2026         BUILD_BUG_ON(sizeof(struct usb_req_rfwrite) +
2027                      USB_MAX_RFWRITE_BIT_COUNT * sizeof(__le16) >
2028                      sizeof(usb->req_buf));
2029         BUG_ON(sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16) >
2030                sizeof(usb->req_buf));
2031
2032         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
2033         req = (void *)usb->req_buf;
2034
2035         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
2036         /* 1: 3683a, but not used in ZYDAS driver */
2037         req->value = cpu_to_le16(2);
2038         req->bits = cpu_to_le16(bits);
2039
2040         for (i = 0; i < bits; i++) {
2041                 u16 bv = bit_value_template;
2042                 if (value & (1 << (bits-1-i)))
2043                         bv |= RF_DATA;
2044                 req->bit_values[i] = cpu_to_le16(bv);
2045         }
2046
2047         udev = zd_usb_to_usbdev(usb);
2048         r = zd_ep_regs_out_msg(udev, req, req_len, &actual_req_len, 50 /*ms*/);
2049         if (r) {
2050                 dev_dbg_f(zd_usb_dev(usb),
2051                         "error in zd_ep_regs_out_msg(). Error number %d\n", r);
2052                 goto out;
2053         }
2054         if (req_len != actual_req_len) {
2055                 dev_dbg_f(zd_usb_dev(usb), "error in zd_ep_regs_out_msg()"
2056                         " req_len %d != actual_req_len %d\n",
2057                         req_len, actual_req_len);
2058                 r = -EIO;
2059                 goto out;
2060         }
2061
2062         /* FALL-THROUGH with r == 0 */
2063 out:
2064         return r;
2065 }