drivers/net/wireless/zd1211rw/zd_usb.c

   1 /* zd_usb.c
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  16  */
  17
  18 #include <asm/unaligned.h>
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/module.h>
  22 #include <linux/firmware.h>
  23 #include <linux/device.h>
  24 #include <linux/errno.h>
  25 #include <linux/skbuff.h>
  26 #include <linux/usb.h>
  27 #include <net/ieee80211.h>
  28
  29 #include "zd_def.h"
  30 #include "zd_netdev.h"
  31 #include "zd_mac.h"
  32 #include "zd_usb.h"
  33 #include "zd_util.h"
  34
  35 static struct usb_device_id usb_ids[] = {
  36         /* ZD1211 */
  37         { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
  38         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
  39         { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
  40         { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
  41         { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
  42         { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
  43         { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
  44         { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
  45         { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
  46         { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
  47         { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
  48         /* ZD1211B */
  49         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  50         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  51         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  52         { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
  53         /* "Driverless" devices that need ejecting */
  54         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
  55         {}
  56 };
  57
  58 MODULE_LICENSE("GPL");
  59 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
  60 MODULE_AUTHOR("Ulrich Kunitz");
  61 MODULE_AUTHOR("Daniel Drake");
  62 MODULE_VERSION("1.0");
  63 MODULE_DEVICE_TABLE(usb, usb_ids);
  64
  65 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
  66 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
  67
  68 /* register address handling */
  69
  70 #ifdef DEBUG
  71 static int check_addr(struct zd_usb *usb, zd_addr_t addr)
  72 {
  73         u32 base = ZD_ADDR_BASE(addr);
  74         u32 offset = ZD_OFFSET(addr);
  75
  76         if ((u32)addr & ADDR_ZERO_MASK)
  77                 goto invalid_address;
  78         switch (base) {
  79         case USB_BASE:
  80                 break;
  81         case CR_BASE:
  82                 if (offset > CR_MAX_OFFSET) {
  83                         dev_dbg(zd_usb_dev(usb),
  84                                 "CR offset %#010x larger than"
  85                                 " CR_MAX_OFFSET %#10x\n",
  86                                 offset, CR_MAX_OFFSET);
  87                         goto invalid_address;
  88                 }
  89                 if (offset & 1) {
  90                         dev_dbg(zd_usb_dev(usb),
  91                                 "CR offset %#010x is not a multiple of 2\n",
  92                                 offset);
  93                         goto invalid_address;
  94                 }
  95                 break;
  96         case E2P_BASE:
  97                 if (offset > E2P_MAX_OFFSET) {
  98                         dev_dbg(zd_usb_dev(usb),
  99                                 "E2P offset %#010x larger than"
 100                                 " E2P_MAX_OFFSET %#010x\n",
 101                                 offset, E2P_MAX_OFFSET);
 102                         goto invalid_address;
 103                 }
 104                 break;
 105         case FW_BASE:
 106                 if (!usb->fw_base_offset) {
 107                         dev_dbg(zd_usb_dev(usb),
 108                                "ERROR: fw base offset has not been set\n");
 109                         return -EAGAIN;
 110                 }
 111                 if (offset > FW_MAX_OFFSET) {
 112                         dev_dbg(zd_usb_dev(usb),
 113                                 "FW offset %#10x is larger than"
 114                                 " FW_MAX_OFFSET %#010x\n",
 115                                 offset, FW_MAX_OFFSET);
 116                         goto invalid_address;
 117                 }
 118                 break;
 119         default:
 120                 dev_dbg(zd_usb_dev(usb),
 121                         "address has unsupported base %#010x\n", addr);
 122                 goto invalid_address;
 123         }
 124
 125         return 0;
 126 invalid_address:
 127         dev_dbg(zd_usb_dev(usb),
 128                 "ERROR: invalid address: %#010x\n", addr);
 129         return -EINVAL;
 130 }
 131 #endif /* DEBUG */
 132
 133 static u16 usb_addr(struct zd_usb *usb, zd_addr_t addr)
 134 {
 135         u32 base;
 136         u16 offset;
 137
 138         base = ZD_ADDR_BASE(addr);
 139         offset = ZD_OFFSET(addr);
 140
 141         ZD_ASSERT(check_addr(usb, addr) == 0);
 142
 143         switch (base) {
 144         case CR_BASE:
 145                 offset += CR_BASE_OFFSET;
 146                 break;
 147         case E2P_BASE:
 148                 offset += E2P_BASE_OFFSET;
 149                 break;
 150         case FW_BASE:
 151                 offset += usb->fw_base_offset;
 152                 break;
 153         }
 154
 155         return offset;
 156 }
 157
 158 /* USB device initialization */
 159
 160 static int request_fw_file(
 161         const struct firmware **fw, const char *name, struct device *device)
 162 {
 163         int r;
 164
 165         dev_dbg_f(device, "fw name %s\n", name);
 166
 167         r = request_firmware(fw, name, device);
 168         if (r)
 169                 dev_err(device,
 170                        "Could not load firmware file %s. Error number %d\n",
 171                        name, r);
 172         return r;
 173 }
 174
 175 static inline u16 get_bcdDevice(const struct usb_device *udev)
 176 {
 177         return le16_to_cpu(udev->descriptor.bcdDevice);
 178 }
 179
 180 enum upload_code_flags {
 181         REBOOT = 1,
 182 };
 183
 184 /* Ensures that MAX_TRANSFER_SIZE is even. */
 185 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 186
 187 static int upload_code(struct usb_device *udev,
 188         const u8 *data, size_t size, u16 code_offset, int flags)
 189 {
 190         u8 *p;
 191         int r;
 192
 193         /* USB request blocks need "kmalloced" buffers.
 194          */
 195         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 196         if (!p) {
 197                 dev_err(&udev->dev, "out of memory\n");
 198                 r = -ENOMEM;
 199                 goto error;
 200         }
 201
 202         size &= ~1;
 203         while (size > 0) {
 204                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 205                         size : MAX_TRANSFER_SIZE;
 206
 207                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 208
 209                 memcpy(p, data, transfer_size);
 210                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 211                         USB_REQ_FIRMWARE_DOWNLOAD,
 212                         USB_DIR_OUT | USB_TYPE_VENDOR,
 213                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 214                 if (r < 0) {
 215                         dev_err(&udev->dev,
 216                                "USB control request for firmware upload"
 217                                " failed. Error number %d\n", r);
 218                         goto error;
 219                 }
 220                 transfer_size = r & ~1;
 221
 222                 size -= transfer_size;
 223                 data += transfer_size;
 224                 code_offset += transfer_size/sizeof(u16);
 225         }
 226
 227         if (flags & REBOOT) {
 228                 u8 ret;
 229
 230                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 231                         USB_REQ_FIRMWARE_CONFIRM,
 232                         USB_DIR_IN | USB_TYPE_VENDOR,
 233                         0, 0, &ret, sizeof(ret), 5000 /* ms */);
 234                 if (r != sizeof(ret)) {
 235                         dev_err(&udev->dev,
 236                                 "control request firmeware confirmation failed."
 237                                 " Return value %d\n", r);
 238                         if (r >= 0)
 239                                 r = -ENODEV;
 240                         goto error;
 241                 }
 242                 if (ret & 0x80) {
 243                         dev_err(&udev->dev,
 244                                 "Internal error while downloading."
 245                                 " Firmware confirm return value %#04x\n",
 246                                 (unsigned int)ret);
 247                         r = -ENODEV;
 248                         goto error;
 249                 }
 250                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 251                         (unsigned int)ret);
 252         }
 253
 254         r = 0;
 255 error:
 256         kfree(p);
 257         return r;
 258 }
 259
 260 static u16 get_word(const void *data, u16 offset)
 261 {
 262         const __le16 *p = data;
 263         return le16_to_cpu(p[offset]);
 264 }
 265
 266 static char *get_fw_name(char *buffer, size_t size, u8 device_type,
 267                        const char* postfix)
 268 {
 269         scnprintf(buffer, size, "%s%s",
 270                 device_type == DEVICE_ZD1211B ?
 271                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 272                 postfix);
 273         return buffer;
 274 }
 275
 276 static int handle_version_mismatch(struct usb_device *udev, u8 device_type,
 277         const struct firmware *ub_fw)
 278 {
 279         const struct firmware *ur_fw = NULL;
 280         int offset;
 281         int r = 0;
 282         char fw_name[128];
 283
 284         r = request_fw_file(&ur_fw,
 285                 get_fw_name(fw_name, sizeof(fw_name), device_type, "ur"),
 286                 &udev->dev);
 287         if (r)
 288                 goto error;
 289
 290         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START_OFFSET,
 291                 REBOOT);
 292         if (r)
 293                 goto error;
 294
 295         offset = ((EEPROM_REGS_OFFSET + EEPROM_REGS_SIZE) * sizeof(u16));
 296         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
 297                 E2P_BASE_OFFSET + EEPROM_REGS_SIZE, REBOOT);
 298
 299         /* At this point, the vendor driver downloads the whole firmware
 300          * image, hacks around with version IDs, and uploads it again,
 301          * completely overwriting the boot code. We do not do this here as
 302          * it is not required on any tested devices, and it is suspected to
 303          * cause problems. */
 304 error:
 305         release_firmware(ur_fw);
 306         return r;
 307 }
 308
 309 static int upload_firmware(struct usb_device *udev, u8 device_type)
 310 {
 311         int r;
 312         u16 fw_bcdDevice;
 313         u16 bcdDevice;
 314         const struct firmware *ub_fw = NULL;
 315         const struct firmware *uph_fw = NULL;
 316         char fw_name[128];
 317
 318         bcdDevice = get_bcdDevice(udev);
 319
 320         r = request_fw_file(&ub_fw,
 321                 get_fw_name(fw_name, sizeof(fw_name), device_type,  "ub"),
 322                 &udev->dev);
 323         if (r)
 324                 goto error;
 325
 326         fw_bcdDevice = get_word(ub_fw->data, EEPROM_REGS_OFFSET);
 327
 328         if (fw_bcdDevice != bcdDevice) {
 329                 dev_info(&udev->dev,
 330                         "firmware version %#06x and device bootcode version "
 331                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
 332                 if (bcdDevice <= 0x4313)
 333                         dev_warn(&udev->dev, "device has old bootcode, please "
 334                                 "report success or failure\n");
 335
 336                 r = handle_version_mismatch(udev, device_type, ub_fw);
 337                 if (r)
 338                         goto error;
 339         } else {
 340                 dev_dbg_f(&udev->dev,
 341                         "firmware device id %#06x is equal to the "
 342                         "actual device id\n", fw_bcdDevice);
 343         }
 344
 345
 346         r = request_fw_file(&uph_fw,
 347                 get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"),
 348                 &udev->dev);
 349         if (r)
 350                 goto error;
 351
 352         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START_OFFSET,
 353                         REBOOT);
 354         if (r) {
 355                 dev_err(&udev->dev,
 356                         "Could not upload firmware code uph. Error number %d\n",
 357                         r);
 358         }
 359
 360         /* FALL-THROUGH */
 361 error:
 362         release_firmware(ub_fw);
 363         release_firmware(uph_fw);
 364         return r;
 365 }
 366
 367 static void disable_read_regs_int(struct zd_usb *usb)
 368 {
 369         struct zd_usb_interrupt *intr = &usb->intr;
 370
 371         spin_lock(&intr->lock);
 372         intr->read_regs_enabled = 0;
 373         spin_unlock(&intr->lock);
 374 }
 375
 376 #define urb_dev(urb) (&(urb)->dev->dev)
 377
 378 static inline void handle_regs_int(struct urb *urb)
 379 {
 380         struct zd_usb *usb = urb->context;
 381         struct zd_usb_interrupt *intr = &usb->intr;
 382         int len;
 383
 384         ZD_ASSERT(in_interrupt());
 385         spin_lock(&intr->lock);
 386
 387         if (intr->read_regs_enabled) {
 388                 intr->read_regs.length = len = urb->actual_length;
 389
 390                 if (len > sizeof(intr->read_regs.buffer))
 391                         len = sizeof(intr->read_regs.buffer);
 392                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 393                 intr->read_regs_enabled = 0;
 394                 complete(&intr->read_regs.completion);
 395                 goto out;
 396         }
 397
 398         dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
 399 out:
 400         spin_unlock(&intr->lock);
 401 }
 402
 403 static inline void handle_retry_failed_int(struct urb *urb)
 404 {
 405         dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
 406 }
 407
 408
 409 static void int_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
 410 {
 411         int r;
 412         struct usb_int_header *hdr;
 413
 414         switch (urb->status) {
 415         case 0:
 416                 break;
 417         case -ESHUTDOWN:
 418         case -EINVAL:
 419         case -ENODEV:
 420         case -ENOENT:
 421         case -ECONNRESET:
 422         case -EPIPE:
 423                 goto kfree;
 424         default:
 425                 goto resubmit;
 426         }
 427
 428         if (urb->actual_length < sizeof(hdr)) {
 429                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 430                 goto resubmit;
 431         }
 432
 433         hdr = urb->transfer_buffer;
 434         if (hdr->type != USB_INT_TYPE) {
 435                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 436                 goto resubmit;
 437         }
 438
 439         switch (hdr->id) {
 440         case USB_INT_ID_REGS:
 441                 handle_regs_int(urb);
 442                 break;
 443         case USB_INT_ID_RETRY_FAILED:
 444                 handle_retry_failed_int(urb);
 445                 break;
 446         default:
 447                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 448                         (unsigned int)hdr->id);
 449                 goto resubmit;
 450         }
 451
 452 resubmit:
 453         r = usb_submit_urb(urb, GFP_ATOMIC);
 454         if (r) {
 455                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
 456                 goto kfree;
 457         }
 458         return;
 459 kfree:
 460         kfree(urb->transfer_buffer);
 461 }
 462
 463 static inline int int_urb_interval(struct usb_device *udev)
 464 {
 465         switch (udev->speed) {
 466         case USB_SPEED_HIGH:
 467                 return 4;
 468         case USB_SPEED_LOW:
 469                 return 10;
 470         case USB_SPEED_FULL:
 471         default:
 472                 return 1;
 473         }
 474 }
 475
 476 static inline int usb_int_enabled(struct zd_usb *usb)
 477 {
 478         unsigned long flags;
 479         struct zd_usb_interrupt *intr = &usb->intr;
 480         struct urb *urb;
 481
 482         spin_lock_irqsave(&intr->lock, flags);
 483         urb = intr->urb;
 484         spin_unlock_irqrestore(&intr->lock, flags);
 485         return urb != NULL;
 486 }
 487
 488 int zd_usb_enable_int(struct zd_usb *usb)
 489 {
 490         int r;
 491         struct usb_device *udev;
 492         struct zd_usb_interrupt *intr = &usb->intr;
 493         void *transfer_buffer = NULL;
 494         struct urb *urb;
 495
 496         dev_dbg_f(zd_usb_dev(usb), "\n");
 497
 498         urb = usb_alloc_urb(0, GFP_NOFS);
 499         if (!urb) {
 500                 r = -ENOMEM;
 501                 goto out;
 502         }
 503
 504         ZD_ASSERT(!irqs_disabled());
 505         spin_lock_irq(&intr->lock);
 506         if (intr->urb) {
 507                 spin_unlock_irq(&intr->lock);
 508                 r = 0;
 509                 goto error_free_urb;
 510         }
 511         intr->urb = urb;
 512         spin_unlock_irq(&intr->lock);
 513
 514         /* TODO: make it a DMA buffer */
 515         r = -ENOMEM;
 516         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_NOFS);
 517         if (!transfer_buffer) {
 518                 dev_dbg_f(zd_usb_dev(usb),
 519                         "couldn't allocate transfer_buffer\n");
 520                 goto error_set_urb_null;
 521         }
 522
 523         udev = zd_usb_to_usbdev(usb);
 524         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 525                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
 526                          int_urb_complete, usb,
 527                          intr->interval);
 528
 529         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 530         r = usb_submit_urb(urb, GFP_NOFS);
 531         if (r) {
 532                 dev_dbg_f(zd_usb_dev(usb),
 533                          "Couldn't submit urb. Error number %d\n", r);
 534                 goto error;
 535         }
 536
 537         return 0;
 538 error:
 539         kfree(transfer_buffer);
 540 error_set_urb_null:
 541         spin_lock_irq(&intr->lock);
 542         intr->urb = NULL;
 543         spin_unlock_irq(&intr->lock);
 544 error_free_urb:
 545         usb_free_urb(urb);
 546 out:
 547         return r;
 548 }
 549
 550 void zd_usb_disable_int(struct zd_usb *usb)
 551 {
 552         unsigned long flags;
 553         struct zd_usb_interrupt *intr = &usb->intr;
 554         struct urb *urb;
 555
 556         spin_lock_irqsave(&intr->lock, flags);
 557         urb = intr->urb;
 558         if (!urb) {
 559                 spin_unlock_irqrestore(&intr->lock, flags);
 560                 return;
 561         }
 562         intr->urb = NULL;
 563         spin_unlock_irqrestore(&intr->lock, flags);
 564
 565         usb_kill_urb(urb);
 566         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 567         usb_free_urb(urb);
 568 }
 569
 570 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 571                              unsigned int length)
 572 {
 573         int i;
 574         struct zd_mac *mac = zd_usb_to_mac(usb);
 575         const struct rx_length_info *length_info;
 576
 577         if (length < sizeof(struct rx_length_info)) {
 578                 /* It's not a complete packet anyhow. */
 579                 return;
 580         }
 581         length_info = (struct rx_length_info *)
 582                 (buffer + length - sizeof(struct rx_length_info));
 583
 584         /* It might be that three frames are merged into a single URB
 585          * transaction. We have to check for the length info tag.
 586          *
 587          * While testing we discovered that length_info might be unaligned,
 588          * because if USB transactions are merged, the last packet will not
 589          * be padded. Unaligned access might also happen if the length_info
 590          * structure is not present.
 591          */
 592         if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
 593         {
 594                 unsigned int l, k, n;
 595                 for (i = 0, l = 0;; i++) {
 596                         k = le16_to_cpu(get_unaligned(&length_info->length[i]));
 597                         n = l+k;
 598                         if (n > length)
 599                                 return;
 600                         zd_mac_rx(mac, buffer+l, k);
 601                         if (i >= 2)
 602                                 return;
 603                         l = (n+3) & ~3;
 604                 }
 605         } else {
 606                 zd_mac_rx(mac, buffer, length);
 607         }
 608 }
 609
 610 static void rx_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
 611 {
 612         struct zd_usb *usb;
 613         struct zd_usb_rx *rx;
 614         const u8 *buffer;
 615         unsigned int length;
 616
 617         switch (urb->status) {
 618         case 0:
 619                 break;
 620         case -ESHUTDOWN:
 621         case -EINVAL:
 622         case -ENODEV:
 623         case -ENOENT:
 624         case -ECONNRESET:
 625         case -EPIPE:
 626                 return;
 627         default:
 628                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 629                 goto resubmit;
 630         }
 631
 632         buffer = urb->transfer_buffer;
 633         length = urb->actual_length;
 634         usb = urb->context;
 635         rx = &usb->rx;
 636
 637         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 638                 /* If there is an old first fragment, we don't care. */
 639                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 640                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 641                 spin_lock(&rx->lock);
 642                 memcpy(rx->fragment, buffer, length);
 643                 rx->fragment_length = length;
 644                 spin_unlock(&rx->lock);
 645                 goto resubmit;
 646         }
 647
 648         spin_lock(&rx->lock);
 649         if (rx->fragment_length > 0) {
 650                 /* We are on a second fragment, we believe */
 651                 ZD_ASSERT(length + rx->fragment_length <=
 652                           ARRAY_SIZE(rx->fragment));
 653                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 654                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 655                 handle_rx_packet(usb, rx->fragment,
 656                                  rx->fragment_length + length);
 657                 rx->fragment_length = 0;
 658                 spin_unlock(&rx->lock);
 659         } else {
 660                 spin_unlock(&rx->lock);
 661                 handle_rx_packet(usb, buffer, length);
 662         }
 663
 664 resubmit:
 665         usb_submit_urb(urb, GFP_ATOMIC);
 666 }
 667
 668 static struct urb *alloc_urb(struct zd_usb *usb)
 669 {
 670         struct usb_device *udev = zd_usb_to_usbdev(usb);
 671         struct urb *urb;
 672         void *buffer;
 673
 674         urb = usb_alloc_urb(0, GFP_NOFS);
 675         if (!urb)
 676                 return NULL;
 677         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_NOFS,
 678                                   &urb->transfer_dma);
 679         if (!buffer) {
 680                 usb_free_urb(urb);
 681                 return NULL;
 682         }
 683
 684         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 685                           buffer, USB_MAX_RX_SIZE,
 686                           rx_urb_complete, usb);
 687         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 688
 689         return urb;
 690 }
 691
 692 static void free_urb(struct urb *urb)
 693 {
 694         if (!urb)
 695                 return;
 696         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 697                         urb->transfer_buffer, urb->transfer_dma);
 698         usb_free_urb(urb);
 699 }
 700
 701 int zd_usb_enable_rx(struct zd_usb *usb)
 702 {
 703         int i, r;
 704         struct zd_usb_rx *rx = &usb->rx;
 705         struct urb **urbs;
 706
 707         dev_dbg_f(zd_usb_dev(usb), "\n");
 708
 709         r = -ENOMEM;
 710         urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_NOFS);
 711         if (!urbs)
 712                 goto error;
 713         for (i = 0; i < URBS_COUNT; i++) {
 714                 urbs[i] = alloc_urb(usb);
 715                 if (!urbs[i])
 716                         goto error;
 717         }
 718
 719         ZD_ASSERT(!irqs_disabled());
 720         spin_lock_irq(&rx->lock);
 721         if (rx->urbs) {
 722                 spin_unlock_irq(&rx->lock);
 723                 r = 0;
 724                 goto error;
 725         }
 726         rx->urbs = urbs;
 727         rx->urbs_count = URBS_COUNT;
 728         spin_unlock_irq(&rx->lock);
 729
 730         for (i = 0; i < URBS_COUNT; i++) {
 731                 r = usb_submit_urb(urbs[i], GFP_NOFS);
 732                 if (r)
 733                         goto error_submit;
 734         }
 735
 736         return 0;
 737 error_submit:
 738         for (i = 0; i < URBS_COUNT; i++) {
 739                 usb_kill_urb(urbs[i]);
 740         }
 741         spin_lock_irq(&rx->lock);
 742         rx->urbs = NULL;
 743         rx->urbs_count = 0;
 744         spin_unlock_irq(&rx->lock);
 745 error:
 746         if (urbs) {
 747                 for (i = 0; i < URBS_COUNT; i++)
 748                         free_urb(urbs[i]);
 749         }
 750         return r;
 751 }
 752
 753 void zd_usb_disable_rx(struct zd_usb *usb)
 754 {
 755         int i;
 756         unsigned long flags;
 757         struct urb **urbs;
 758         unsigned int count;
 759         struct zd_usb_rx *rx = &usb->rx;
 760
 761         spin_lock_irqsave(&rx->lock, flags);
 762         urbs = rx->urbs;
 763         count = rx->urbs_count;
 764         spin_unlock_irqrestore(&rx->lock, flags);
 765         if (!urbs)
 766                 return;
 767
 768         for (i = 0; i < count; i++) {
 769                 usb_kill_urb(urbs[i]);
 770                 free_urb(urbs[i]);
 771         }
 772         kfree(urbs);
 773
 774         spin_lock_irqsave(&rx->lock, flags);
 775         rx->urbs = NULL;
 776         rx->urbs_count = 0;
 777         spin_unlock_irqrestore(&rx->lock, flags);
 778 }
 779
 780 static void tx_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
 781 {
 782         int r;
 783
 784         switch (urb->status) {
 785         case 0:
 786                 break;
 787         case -ESHUTDOWN:
 788         case -EINVAL:
 789         case -ENODEV:
 790         case -ENOENT:
 791         case -ECONNRESET:
 792         case -EPIPE:
 793                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 794                 break;
 795         default:
 796                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 797                 goto resubmit;
 798         }
 799 free_urb:
 800         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 801                         urb->transfer_buffer, urb->transfer_dma);
 802         usb_free_urb(urb);
 803         return;
 804 resubmit:
 805         r = usb_submit_urb(urb, GFP_ATOMIC);
 806         if (r) {
 807                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 808                 goto free_urb;
 809         }
 810 }
 811
 812 /* Puts the frame on the USB endpoint. It doesn't wait for
 813  * completion. The frame must contain the control set.
 814  */
 815 int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
 816 {
 817         int r;
 818         struct usb_device *udev = zd_usb_to_usbdev(usb);
 819         struct urb *urb;
 820         void *buffer;
 821
 822         urb = usb_alloc_urb(0, GFP_ATOMIC);
 823         if (!urb) {
 824                 r = -ENOMEM;
 825                 goto out;
 826         }
 827
 828         buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
 829                                   &urb->transfer_dma);
 830         if (!buffer) {
 831                 r = -ENOMEM;
 832                 goto error_free_urb;
 833         }
 834         memcpy(buffer, frame, length);
 835
 836         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 837                           buffer, length, tx_urb_complete, NULL);
 838         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 839
 840         r = usb_submit_urb(urb, GFP_ATOMIC);
 841         if (r)
 842                 goto error;
 843         return 0;
 844 error:
 845         usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
 846                         urb->transfer_dma);
 847 error_free_urb:
 848         usb_free_urb(urb);
 849 out:
 850         return r;
 851 }
 852
 853 static inline void init_usb_interrupt(struct zd_usb *usb)
 854 {
 855         struct zd_usb_interrupt *intr = &usb->intr;
 856
 857         spin_lock_init(&intr->lock);
 858         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 859         init_completion(&intr->read_regs.completion);
 860         intr->read_regs.cr_int_addr = cpu_to_le16(usb_addr(usb, CR_INTERRUPT));
 861 }
 862
 863 static inline void init_usb_rx(struct zd_usb *usb)
 864 {
 865         struct zd_usb_rx *rx = &usb->rx;
 866         spin_lock_init(&rx->lock);
 867         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 868                 rx->usb_packet_size = 512;
 869         } else {
 870                 rx->usb_packet_size = 64;
 871         }
 872         ZD_ASSERT(rx->fragment_length == 0);
 873 }
 874
 875 static inline void init_usb_tx(struct zd_usb *usb)
 876 {
 877         /* FIXME: at this point we will allocate a fixed number of urb's for
 878          * use in a cyclic scheme */
 879 }
 880
 881 void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
 882                  struct usb_interface *intf)
 883 {
 884         memset(usb, 0, sizeof(*usb));
 885         usb->intf = usb_get_intf(intf);
 886         usb_set_intfdata(usb->intf, netdev);
 887         init_usb_interrupt(usb);
 888         init_usb_tx(usb);
 889         init_usb_rx(usb);
 890 }
 891
 892 int zd_usb_init_hw(struct zd_usb *usb)
 893 {
 894         int r;
 895         struct zd_chip *chip = zd_usb_to_chip(usb);
 896
 897         ZD_ASSERT(mutex_is_locked(&chip->mutex));
 898         r = zd_ioread16_locked(chip, &usb->fw_base_offset,
 899                         USB_REG((u16)FW_BASE_ADDR_OFFSET));
 900         if (r)
 901                 return r;
 902         dev_dbg_f(zd_usb_dev(usb), "fw_base_offset: %#06hx\n",
 903                  usb->fw_base_offset);
 904
 905         return 0;
 906 }
 907
 908 void zd_usb_clear(struct zd_usb *usb)
 909 {
 910         usb_set_intfdata(usb->intf, NULL);
 911         usb_put_intf(usb->intf);
 912         ZD_MEMCLEAR(usb, sizeof(*usb));
 913         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
 914 }
 915
 916 static const char *speed(enum usb_device_speed speed)
 917 {
 918         switch (speed) {
 919         case USB_SPEED_LOW:
 920                 return "low";
 921         case USB_SPEED_FULL:
 922                 return "full";
 923         case USB_SPEED_HIGH:
 924                 return "high";
 925         default:
 926                 return "unknown speed";
 927         }
 928 }
 929
 930 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
 931 {
 932         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
 933                 le16_to_cpu(udev->descriptor.idVendor),
 934                 le16_to_cpu(udev->descriptor.idProduct),
 935                 get_bcdDevice(udev),
 936                 speed(udev->speed));
 937 }
 938
 939 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
 940 {
 941         struct usb_device *udev = interface_to_usbdev(usb->intf);
 942         return scnprint_id(udev, buffer, size);
 943 }
 944
 945 #ifdef DEBUG
 946 static void print_id(struct usb_device *udev)
 947 {
 948         char buffer[40];
 949
 950         scnprint_id(udev, buffer, sizeof(buffer));
 951         buffer[sizeof(buffer)-1] = 0;
 952         dev_dbg_f(&udev->dev, "%s\n", buffer);
 953 }
 954 #else
 955 #define print_id(udev) do { } while (0)
 956 #endif
 957
 958 static int eject_installer(struct usb_interface *intf)
 959 {
 960         struct usb_device *udev = interface_to_usbdev(intf);
 961         struct usb_host_interface *iface_desc = &intf->altsetting[0];
 962         struct usb_endpoint_descriptor *endpoint;
 963         unsigned char *cmd;
 964         u8 bulk_out_ep;
 965         int r;
 966
 967         /* Find bulk out endpoint */
 968         endpoint = &iface_desc->endpoint[1].desc;
 969         if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
 970             (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
 971             USB_ENDPOINT_XFER_BULK) {
 972                 bulk_out_ep = endpoint->bEndpointAddress;
 973         } else {
 974                 dev_err(&udev->dev,
 975                         "zd1211rw: Could not find bulk out endpoint\n");
 976                 return -ENODEV;
 977         }
 978
 979         cmd = kzalloc(31, GFP_KERNEL);
 980         if (cmd == NULL)
 981                 return -ENODEV;
 982
 983         /* USB bulk command block */
 984         cmd[0] = 0x55;  /* bulk command signature */
 985         cmd[1] = 0x53;  /* bulk command signature */
 986         cmd[2] = 0x42;  /* bulk command signature */
 987         cmd[3] = 0x43;  /* bulk command signature */
 988         cmd[14] = 6;    /* command length */
 989
 990         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
 991         cmd[19] = 0x2;  /* eject disc */
 992
 993         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
 994         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
 995                 cmd, 31, NULL, 2000);
 996         kfree(cmd);
 997         if (r)
 998                 return r;
 999
1000         /* At this point, the device disconnects and reconnects with the real
1001          * ID numbers. */
1002
1003         usb_set_intfdata(intf, NULL);
1004         return 0;
1005 }
1006
1007 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1008 {
1009         int r;
1010         struct usb_device *udev = interface_to_usbdev(intf);
1011         struct net_device *netdev = NULL;
1012
1013         print_id(udev);
1014
1015         if (id->driver_info & DEVICE_INSTALLER)
1016                 return eject_installer(intf);
1017
1018         switch (udev->speed) {
1019         case USB_SPEED_LOW:
1020         case USB_SPEED_FULL:
1021         case USB_SPEED_HIGH:
1022                 break;
1023         default:
1024                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1025                 r = -ENODEV;
1026                 goto error;
1027         }
1028
1029         netdev = zd_netdev_alloc(intf);
1030         if (netdev == NULL) {
1031                 r = -ENOMEM;
1032                 goto error;
1033         }
1034
1035         r = upload_firmware(udev, id->driver_info);
1036         if (r) {
1037                 dev_err(&intf->dev,
1038                        "couldn't load firmware. Error number %d\n", r);
1039                 goto error;
1040         }
1041
1042         r = usb_reset_configuration(udev);
1043         if (r) {
1044                 dev_dbg_f(&intf->dev,
1045                         "couldn't reset configuration. Error number %d\n", r);
1046                 goto error;
1047         }
1048
1049         /* At this point the interrupt endpoint is not generally enabled. We
1050          * save the USB bandwidth until the network device is opened. But
1051          * notify that the initialization of the MAC will require the
1052          * interrupts to be temporary enabled.
1053          */
1054         r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
1055         if (r) {
1056                 dev_dbg_f(&intf->dev,
1057                          "couldn't initialize mac. Error number %d\n", r);
1058                 goto error;
1059         }
1060
1061         r = register_netdev(netdev);
1062         if (r) {
1063                 dev_dbg_f(&intf->dev,
1064                          "couldn't register netdev. Error number %d\n", r);
1065                 goto error;
1066         }
1067
1068         dev_dbg_f(&intf->dev, "successful\n");
1069         dev_info(&intf->dev,"%s\n", netdev->name);
1070         return 0;
1071 error:
1072         usb_reset_device(interface_to_usbdev(intf));
1073         zd_netdev_free(netdev);
1074         return r;
1075 }
1076
1077 static void disconnect(struct usb_interface *intf)
1078 {
1079         struct net_device *netdev = zd_intf_to_netdev(intf);
1080         struct zd_mac *mac = zd_netdev_mac(netdev);
1081         struct zd_usb *usb = &mac->chip.usb;
1082
1083         /* Either something really bad happened, or we're just dealing with
1084          * a DEVICE_INSTALLER. */
1085         if (netdev == NULL)
1086                 return;
1087
1088         dev_dbg_f(zd_usb_dev(usb), "\n");
1089
1090         zd_netdev_disconnect(netdev);
1091
1092         /* Just in case something has gone wrong! */
1093         zd_usb_disable_rx(usb);
1094         zd_usb_disable_int(usb);
1095
1096         /* If the disconnect has been caused by a removal of the
1097          * driver module, the reset allows reloading of the driver. If the
1098          * reset will not be executed here, the upload of the firmware in the
1099          * probe function caused by the reloading of the driver will fail.
1100          */
1101         usb_reset_device(interface_to_usbdev(intf));
1102
1103         zd_netdev_free(netdev);
1104         dev_dbg(&intf->dev, "disconnected\n");
1105 }
1106
1107 static struct usb_driver driver = {
1108         .name           = "zd1211rw",
1109         .id_table       = usb_ids,
1110         .probe          = probe,
1111         .disconnect     = disconnect,
1112 };
1113
1114 static int __init usb_init(void)
1115 {
1116         int r;
1117
1118         pr_debug("usb_init()\n");
1119
1120         r = usb_register(&driver);
1121         if (r) {
1122                 printk(KERN_ERR "usb_register() failed. Error number %d\n", r);
1123                 return r;
1124         }
1125
1126         pr_debug("zd1211rw initialized\n");
1127         return 0;
1128 }
1129
1130 static void __exit usb_exit(void)
1131 {
1132         pr_debug("usb_exit()\n");
1133         usb_deregister(&driver);
1134 }
1135
1136 module_init(usb_init);
1137 module_exit(usb_exit);
1138
1139 static int usb_int_regs_length(unsigned int count)
1140 {
1141         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1142 }
1143
1144 static void prepare_read_regs_int(struct zd_usb *usb)
1145 {
1146         struct zd_usb_interrupt *intr = &usb->intr;
1147
1148         spin_lock(&intr->lock);
1149         intr->read_regs_enabled = 1;
1150         INIT_COMPLETION(intr->read_regs.completion);
1151         spin_unlock(&intr->lock);
1152 }
1153
1154 static int get_results(struct zd_usb *usb, u16 *values,
1155                        struct usb_req_read_regs *req, unsigned int count)
1156 {
1157         int r;
1158         int i;
1159         struct zd_usb_interrupt *intr = &usb->intr;
1160         struct read_regs_int *rr = &intr->read_regs;
1161         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1162
1163         spin_lock(&intr->lock);
1164
1165         r = -EIO;
1166         /* The created block size seems to be larger than expected.
1167          * However results appear to be correct.
1168          */
1169         if (rr->length < usb_int_regs_length(count)) {
1170                 dev_dbg_f(zd_usb_dev(usb),
1171                          "error: actual length %d less than expected %d\n",
1172                          rr->length, usb_int_regs_length(count));
1173                 goto error_unlock;
1174         }
1175         if (rr->length > sizeof(rr->buffer)) {
1176                 dev_dbg_f(zd_usb_dev(usb),
1177                          "error: actual length %d exceeds buffer size %zu\n",
1178                          rr->length, sizeof(rr->buffer));
1179                 goto error_unlock;
1180         }
1181
1182         for (i = 0; i < count; i++) {
1183                 struct reg_data *rd = &regs->regs[i];
1184                 if (rd->addr != req->addr[i]) {
1185                         dev_dbg_f(zd_usb_dev(usb),
1186                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1187                                  le16_to_cpu(rd->addr),
1188                                  le16_to_cpu(req->addr[i]));
1189                         goto error_unlock;
1190                 }
1191                 values[i] = le16_to_cpu(rd->value);
1192         }
1193
1194         r = 0;
1195 error_unlock:
1196         spin_unlock(&intr->lock);
1197         return r;
1198 }
1199
1200 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1201                      const zd_addr_t *addresses, unsigned int count)
1202 {
1203         int r;
1204         int i, req_len, actual_req_len;
1205         struct usb_device *udev;
1206         struct usb_req_read_regs *req = NULL;
1207         unsigned long timeout;
1208
1209         if (count < 1) {
1210                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1211                 return -EINVAL;
1212         }
1213         if (count > USB_MAX_IOREAD16_COUNT) {
1214                 dev_dbg_f(zd_usb_dev(usb),
1215                          "error: count %u exceeds possible max %u\n",
1216                          count, USB_MAX_IOREAD16_COUNT);
1217                 return -EINVAL;
1218         }
1219         if (in_atomic()) {
1220                 dev_dbg_f(zd_usb_dev(usb),
1221                          "error: io in atomic context not supported\n");
1222                 return -EWOULDBLOCK;
1223         }
1224         if (!usb_int_enabled(usb)) {
1225                  dev_dbg_f(zd_usb_dev(usb),
1226                           "error: usb interrupt not enabled\n");
1227                 return -EWOULDBLOCK;
1228         }
1229
1230         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1231         req = kmalloc(req_len, GFP_NOFS);
1232         if (!req)
1233                 return -ENOMEM;
1234         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1235         for (i = 0; i < count; i++)
1236                 req->addr[i] = cpu_to_le16(usb_addr(usb, addresses[i]));
1237
1238         udev = zd_usb_to_usbdev(usb);
1239         prepare_read_regs_int(usb);
1240         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1241                          req, req_len, &actual_req_len, 1000 /* ms */);
1242         if (r) {
1243                 dev_dbg_f(zd_usb_dev(usb),
1244                         "error in usb_bulk_msg(). Error number %d\n", r);
1245                 goto error;
1246         }
1247         if (req_len != actual_req_len) {
1248                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1249                         " req_len %d != actual_req_len %d\n",
1250                         req_len, actual_req_len);
1251                 r = -EIO;
1252                 goto error;
1253         }
1254
1255         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1256                                               msecs_to_jiffies(1000));
1257         if (!timeout) {
1258                 disable_read_regs_int(usb);
1259                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1260                 r = -ETIMEDOUT;
1261                 goto error;
1262         }
1263
1264         r = get_results(usb, values, req, count);
1265 error:
1266         kfree(req);
1267         return r;
1268 }
1269
1270 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1271                       unsigned int count)
1272 {
1273         int r;
1274         struct usb_device *udev;
1275         struct usb_req_write_regs *req = NULL;
1276         int i, req_len, actual_req_len;
1277
1278         if (count == 0)
1279                 return 0;
1280         if (count > USB_MAX_IOWRITE16_COUNT) {
1281                 dev_dbg_f(zd_usb_dev(usb),
1282                         "error: count %u exceeds possible max %u\n",
1283                         count, USB_MAX_IOWRITE16_COUNT);
1284                 return -EINVAL;
1285         }
1286         if (in_atomic()) {
1287                 dev_dbg_f(zd_usb_dev(usb),
1288                         "error: io in atomic context not supported\n");
1289                 return -EWOULDBLOCK;
1290         }
1291
1292         req_len = sizeof(struct usb_req_write_regs) +
1293                   count * sizeof(struct reg_data);
1294         req = kmalloc(req_len, GFP_NOFS);
1295         if (!req)
1296                 return -ENOMEM;
1297
1298         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1299         for (i = 0; i < count; i++) {
1300                 struct reg_data *rw  = &req->reg_writes[i];
1301                 rw->addr = cpu_to_le16(usb_addr(usb, ioreqs[i].addr));
1302                 rw->value = cpu_to_le16(ioreqs[i].value);
1303         }
1304
1305         udev = zd_usb_to_usbdev(usb);
1306         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1307                          req, req_len, &actual_req_len, 1000 /* ms */);
1308         if (r) {
1309                 dev_dbg_f(zd_usb_dev(usb),
1310                         "error in usb_bulk_msg(). Error number %d\n", r);
1311                 goto error;
1312         }
1313         if (req_len != actual_req_len) {
1314                 dev_dbg_f(zd_usb_dev(usb),
1315                         "error in usb_bulk_msg()"
1316                         " req_len %d != actual_req_len %d\n",
1317                         req_len, actual_req_len);
1318                 r = -EIO;
1319                 goto error;
1320         }
1321
1322         /* FALL-THROUGH with r == 0 */
1323 error:
1324         kfree(req);
1325         return r;
1326 }
1327
1328 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1329 {
1330         int r;
1331         struct usb_device *udev;
1332         struct usb_req_rfwrite *req = NULL;
1333         int i, req_len, actual_req_len;
1334         u16 bit_value_template;
1335
1336         if (in_atomic()) {
1337                 dev_dbg_f(zd_usb_dev(usb),
1338                         "error: io in atomic context not supported\n");
1339                 return -EWOULDBLOCK;
1340         }
1341         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1342                 dev_dbg_f(zd_usb_dev(usb),
1343                         "error: bits %d are smaller than"
1344                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1345                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1346                 return -EINVAL;
1347         }
1348         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1349                 dev_dbg_f(zd_usb_dev(usb),
1350                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1351                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1352                 return -EINVAL;
1353         }
1354 #ifdef DEBUG
1355         if (value & (~0UL << bits)) {
1356                 dev_dbg_f(zd_usb_dev(usb),
1357                         "error: value %#09x has bits >= %d set\n",
1358                         value, bits);
1359                 return -EINVAL;
1360         }
1361 #endif /* DEBUG */
1362
1363         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1364
1365         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1366         if (r) {
1367                 dev_dbg_f(zd_usb_dev(usb),
1368                         "error %d: Couldn't read CR203\n", r);
1369                 goto out;
1370         }
1371         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1372
1373         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1374         req = kmalloc(req_len, GFP_NOFS);
1375         if (!req)
1376                 return -ENOMEM;
1377
1378         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1379         /* 1: 3683a, but not used in ZYDAS driver */
1380         req->value = cpu_to_le16(2);
1381         req->bits = cpu_to_le16(bits);
1382
1383         for (i = 0; i < bits; i++) {
1384                 u16 bv = bit_value_template;
1385                 if (value & (1 << (bits-1-i)))
1386                         bv |= RF_DATA;
1387                 req->bit_values[i] = cpu_to_le16(bv);
1388         }
1389
1390         udev = zd_usb_to_usbdev(usb);
1391         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1392                          req, req_len, &actual_req_len, 1000 /* ms */);
1393         if (r) {
1394                 dev_dbg_f(zd_usb_dev(usb),
1395                         "error in usb_bulk_msg(). Error number %d\n", r);
1396                 goto out;
1397         }
1398         if (req_len != actual_req_len) {
1399                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1400                         " req_len %d != actual_req_len %d\n",
1401                         req_len, actual_req_len);
1402                 r = -EIO;
1403                 goto out;
1404         }
1405
1406         /* FALL-THROUGH with r == 0 */
1407 out:
1408         kfree(req);
1409         return r;
1410 }