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 <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/module.h>
  21 #include <linux/firmware.h>
  22 #include <linux/device.h>
  23 #include <linux/errno.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/usb.h>
  26 #include <linux/workqueue.h>
  27 #include <net/ieee80211.h>
  28 #include <asm/unaligned.h>
  29
  30 #include "zd_def.h"
  31 #include "zd_netdev.h"
  32 #include "zd_mac.h"
  33 #include "zd_usb.h"
  34 #include "zd_util.h"
  35
  36 static struct usb_device_id usb_ids[] = {
  37         /* ZD1211 */
  38         { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
  39         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
  40         { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
  41         { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
  42         { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
  43         { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
  44         { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
  45         { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
  46         { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
  47         { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
  48         { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
  49         { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
  50         { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
  51         { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
  52         { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
  53         { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
  54         { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
  55         { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
  56         { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
  57         { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
  58         /* ZD1211B */
  59         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
  60         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
  61         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
  62         { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
  63         { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
  64         { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
  65         { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
  66         { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
  67         { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
  68         { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
  69         { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
  70         { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
  71         { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
  72         { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
  73         { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
  74         { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
  75         /* "Driverless" devices that need ejecting */
  76         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
  77         { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
  78         {}
  79 };
  80
  81 MODULE_LICENSE("GPL");
  82 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
  83 MODULE_AUTHOR("Ulrich Kunitz");
  84 MODULE_AUTHOR("Daniel Drake");
  85 MODULE_VERSION("1.0");
  86 MODULE_DEVICE_TABLE(usb, usb_ids);
  87
  88 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
  89 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
  90
  91 /* USB device initialization */
  92
  93 static int request_fw_file(
  94         const struct firmware **fw, const char *name, struct device *device)
  95 {
  96         int r;
  97
  98         dev_dbg_f(device, "fw name %s\n", name);
  99
 100         r = request_firmware(fw, name, device);
 101         if (r)
 102                 dev_err(device,
 103                        "Could not load firmware file %s. Error number %d\n",
 104                        name, r);
 105         return r;
 106 }
 107
 108 static inline u16 get_bcdDevice(const struct usb_device *udev)
 109 {
 110         return le16_to_cpu(udev->descriptor.bcdDevice);
 111 }
 112
 113 enum upload_code_flags {
 114         REBOOT = 1,
 115 };
 116
 117 /* Ensures that MAX_TRANSFER_SIZE is even. */
 118 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 119
 120 static int upload_code(struct usb_device *udev,
 121         const u8 *data, size_t size, u16 code_offset, int flags)
 122 {
 123         u8 *p;
 124         int r;
 125
 126         /* USB request blocks need "kmalloced" buffers.
 127          */
 128         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 129         if (!p) {
 130                 dev_err(&udev->dev, "out of memory\n");
 131                 r = -ENOMEM;
 132                 goto error;
 133         }
 134
 135         size &= ~1;
 136         while (size > 0) {
 137                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 138                         size : MAX_TRANSFER_SIZE;
 139
 140                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 141
 142                 memcpy(p, data, transfer_size);
 143                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 144                         USB_REQ_FIRMWARE_DOWNLOAD,
 145                         USB_DIR_OUT | USB_TYPE_VENDOR,
 146                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 147                 if (r < 0) {
 148                         dev_err(&udev->dev,
 149                                "USB control request for firmware upload"
 150                                " failed. Error number %d\n", r);
 151                         goto error;
 152                 }
 153                 transfer_size = r & ~1;
 154
 155                 size -= transfer_size;
 156                 data += transfer_size;
 157                 code_offset += transfer_size/sizeof(u16);
 158         }
 159
 160         if (flags & REBOOT) {
 161                 u8 ret;
 162
 163                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 164                         USB_REQ_FIRMWARE_CONFIRM,
 165                         USB_DIR_IN | USB_TYPE_VENDOR,
 166                         0, 0, &ret, sizeof(ret), 5000 /* ms */);
 167                 if (r != sizeof(ret)) {
 168                         dev_err(&udev->dev,
 169                                 "control request firmeware confirmation failed."
 170                                 " Return value %d\n", r);
 171                         if (r >= 0)
 172                                 r = -ENODEV;
 173                         goto error;
 174                 }
 175                 if (ret & 0x80) {
 176                         dev_err(&udev->dev,
 177                                 "Internal error while downloading."
 178                                 " Firmware confirm return value %#04x\n",
 179                                 (unsigned int)ret);
 180                         r = -ENODEV;
 181                         goto error;
 182                 }
 183                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 184                         (unsigned int)ret);
 185         }
 186
 187         r = 0;
 188 error:
 189         kfree(p);
 190         return r;
 191 }
 192
 193 static u16 get_word(const void *data, u16 offset)
 194 {
 195         const __le16 *p = data;
 196         return le16_to_cpu(p[offset]);
 197 }
 198
 199 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
 200                        const char* postfix)
 201 {
 202         scnprintf(buffer, size, "%s%s",
 203                 usb->is_zd1211b ?
 204                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 205                 postfix);
 206         return buffer;
 207 }
 208
 209 static int handle_version_mismatch(struct zd_usb *usb,
 210         const struct firmware *ub_fw)
 211 {
 212         struct usb_device *udev = zd_usb_to_usbdev(usb);
 213         const struct firmware *ur_fw = NULL;
 214         int offset;
 215         int r = 0;
 216         char fw_name[128];
 217
 218         r = request_fw_file(&ur_fw,
 219                 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
 220                 &udev->dev);
 221         if (r)
 222                 goto error;
 223
 224         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
 225         if (r)
 226                 goto error;
 227
 228         offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
 229         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
 230                 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
 231
 232         /* At this point, the vendor driver downloads the whole firmware
 233          * image, hacks around with version IDs, and uploads it again,
 234          * completely overwriting the boot code. We do not do this here as
 235          * it is not required on any tested devices, and it is suspected to
 236          * cause problems. */
 237 error:
 238         release_firmware(ur_fw);
 239         return r;
 240 }
 241
 242 static int upload_firmware(struct zd_usb *usb)
 243 {
 244         int r;
 245         u16 fw_bcdDevice;
 246         u16 bcdDevice;
 247         struct usb_device *udev = zd_usb_to_usbdev(usb);
 248         const struct firmware *ub_fw = NULL;
 249         const struct firmware *uph_fw = NULL;
 250         char fw_name[128];
 251
 252         bcdDevice = get_bcdDevice(udev);
 253
 254         r = request_fw_file(&ub_fw,
 255                 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
 256                 &udev->dev);
 257         if (r)
 258                 goto error;
 259
 260         fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
 261
 262         if (fw_bcdDevice != bcdDevice) {
 263                 dev_info(&udev->dev,
 264                         "firmware version %#06x and device bootcode version "
 265                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
 266                 if (bcdDevice <= 0x4313)
 267                         dev_warn(&udev->dev, "device has old bootcode, please "
 268                                 "report success or failure\n");
 269
 270                 r = handle_version_mismatch(usb, ub_fw);
 271                 if (r)
 272                         goto error;
 273         } else {
 274                 dev_dbg_f(&udev->dev,
 275                         "firmware device id %#06x is equal to the "
 276                         "actual device id\n", fw_bcdDevice);
 277         }
 278
 279
 280         r = request_fw_file(&uph_fw,
 281                 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
 282                 &udev->dev);
 283         if (r)
 284                 goto error;
 285
 286         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
 287         if (r) {
 288                 dev_err(&udev->dev,
 289                         "Could not upload firmware code uph. Error number %d\n",
 290                         r);
 291         }
 292
 293         /* FALL-THROUGH */
 294 error:
 295         release_firmware(ub_fw);
 296         release_firmware(uph_fw);
 297         return r;
 298 }
 299
 300 /* Read data from device address space using "firmware interface" which does
 301  * not require firmware to be loaded. */
 302 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
 303 {
 304         int r;
 305         struct usb_device *udev = zd_usb_to_usbdev(usb);
 306
 307         r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 308                 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
 309                 data, len, 5000);
 310         if (r < 0) {
 311                 dev_err(&udev->dev,
 312                         "read over firmware interface failed: %d\n", r);
 313                 return r;
 314         } else if (r != len) {
 315                 dev_err(&udev->dev,
 316                         "incomplete read over firmware interface: %d/%d\n",
 317                         r, len);
 318                 return -EIO;
 319         }
 320
 321         return 0;
 322 }
 323
 324 #define urb_dev(urb) (&(urb)->dev->dev)
 325
 326 static inline void handle_regs_int(struct urb *urb)
 327 {
 328         struct zd_usb *usb = urb->context;
 329         struct zd_usb_interrupt *intr = &usb->intr;
 330         int len;
 331
 332         ZD_ASSERT(in_interrupt());
 333         spin_lock(&intr->lock);
 334
 335         if (intr->read_regs_enabled) {
 336                 intr->read_regs.length = len = urb->actual_length;
 337
 338                 if (len > sizeof(intr->read_regs.buffer))
 339                         len = sizeof(intr->read_regs.buffer);
 340                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 341                 intr->read_regs_enabled = 0;
 342                 complete(&intr->read_regs.completion);
 343                 goto out;
 344         }
 345
 346         dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
 347 out:
 348         spin_unlock(&intr->lock);
 349 }
 350
 351 static inline void handle_retry_failed_int(struct urb *urb)
 352 {
 353         struct zd_usb *usb = urb->context;
 354         struct zd_mac *mac = zd_usb_to_mac(usb);
 355         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 356
 357         ieee->stats.tx_errors++;
 358         ieee->ieee_stats.tx_retry_limit_exceeded++;
 359         dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
 360 }
 361
 362
 363 static void int_urb_complete(struct urb *urb)
 364 {
 365         int r;
 366         struct usb_int_header *hdr;
 367
 368         switch (urb->status) {
 369         case 0:
 370                 break;
 371         case -ESHUTDOWN:
 372         case -EINVAL:
 373         case -ENODEV:
 374         case -ENOENT:
 375         case -ECONNRESET:
 376         case -EPIPE:
 377                 goto kfree;
 378         default:
 379                 goto resubmit;
 380         }
 381
 382         if (urb->actual_length < sizeof(hdr)) {
 383                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 384                 goto resubmit;
 385         }
 386
 387         hdr = urb->transfer_buffer;
 388         if (hdr->type != USB_INT_TYPE) {
 389                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 390                 goto resubmit;
 391         }
 392
 393         switch (hdr->id) {
 394         case USB_INT_ID_REGS:
 395                 handle_regs_int(urb);
 396                 break;
 397         case USB_INT_ID_RETRY_FAILED:
 398                 handle_retry_failed_int(urb);
 399                 break;
 400         default:
 401                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 402                         (unsigned int)hdr->id);
 403                 goto resubmit;
 404         }
 405
 406 resubmit:
 407         r = usb_submit_urb(urb, GFP_ATOMIC);
 408         if (r) {
 409                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
 410                 goto kfree;
 411         }
 412         return;
 413 kfree:
 414         kfree(urb->transfer_buffer);
 415 }
 416
 417 static inline int int_urb_interval(struct usb_device *udev)
 418 {
 419         switch (udev->speed) {
 420         case USB_SPEED_HIGH:
 421                 return 4;
 422         case USB_SPEED_LOW:
 423                 return 10;
 424         case USB_SPEED_FULL:
 425         default:
 426                 return 1;
 427         }
 428 }
 429
 430 static inline int usb_int_enabled(struct zd_usb *usb)
 431 {
 432         unsigned long flags;
 433         struct zd_usb_interrupt *intr = &usb->intr;
 434         struct urb *urb;
 435
 436         spin_lock_irqsave(&intr->lock, flags);
 437         urb = intr->urb;
 438         spin_unlock_irqrestore(&intr->lock, flags);
 439         return urb != NULL;
 440 }
 441
 442 int zd_usb_enable_int(struct zd_usb *usb)
 443 {
 444         int r;
 445         struct usb_device *udev;
 446         struct zd_usb_interrupt *intr = &usb->intr;
 447         void *transfer_buffer = NULL;
 448         struct urb *urb;
 449
 450         dev_dbg_f(zd_usb_dev(usb), "\n");
 451
 452         urb = usb_alloc_urb(0, GFP_KERNEL);
 453         if (!urb) {
 454                 r = -ENOMEM;
 455                 goto out;
 456         }
 457
 458         ZD_ASSERT(!irqs_disabled());
 459         spin_lock_irq(&intr->lock);
 460         if (intr->urb) {
 461                 spin_unlock_irq(&intr->lock);
 462                 r = 0;
 463                 goto error_free_urb;
 464         }
 465         intr->urb = urb;
 466         spin_unlock_irq(&intr->lock);
 467
 468         /* TODO: make it a DMA buffer */
 469         r = -ENOMEM;
 470         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
 471         if (!transfer_buffer) {
 472                 dev_dbg_f(zd_usb_dev(usb),
 473                         "couldn't allocate transfer_buffer\n");
 474                 goto error_set_urb_null;
 475         }
 476
 477         udev = zd_usb_to_usbdev(usb);
 478         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 479                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
 480                          int_urb_complete, usb,
 481                          intr->interval);
 482
 483         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 484         r = usb_submit_urb(urb, GFP_KERNEL);
 485         if (r) {
 486                 dev_dbg_f(zd_usb_dev(usb),
 487                          "Couldn't submit urb. Error number %d\n", r);
 488                 goto error;
 489         }
 490
 491         return 0;
 492 error:
 493         kfree(transfer_buffer);
 494 error_set_urb_null:
 495         spin_lock_irq(&intr->lock);
 496         intr->urb = NULL;
 497         spin_unlock_irq(&intr->lock);
 498 error_free_urb:
 499         usb_free_urb(urb);
 500 out:
 501         return r;
 502 }
 503
 504 void zd_usb_disable_int(struct zd_usb *usb)
 505 {
 506         unsigned long flags;
 507         struct zd_usb_interrupt *intr = &usb->intr;
 508         struct urb *urb;
 509
 510         spin_lock_irqsave(&intr->lock, flags);
 511         urb = intr->urb;
 512         if (!urb) {
 513                 spin_unlock_irqrestore(&intr->lock, flags);
 514                 return;
 515         }
 516         intr->urb = NULL;
 517         spin_unlock_irqrestore(&intr->lock, flags);
 518
 519         usb_kill_urb(urb);
 520         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 521         usb_free_urb(urb);
 522 }
 523
 524 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 525                              unsigned int length)
 526 {
 527         int i;
 528         struct zd_mac *mac = zd_usb_to_mac(usb);
 529         const struct rx_length_info *length_info;
 530
 531         if (length < sizeof(struct rx_length_info)) {
 532                 /* It's not a complete packet anyhow. */
 533                 struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 534                 ieee->stats.rx_errors++;
 535                 ieee->stats.rx_length_errors++;
 536                 return;
 537         }
 538         length_info = (struct rx_length_info *)
 539                 (buffer + length - sizeof(struct rx_length_info));
 540
 541         /* It might be that three frames are merged into a single URB
 542          * transaction. We have to check for the length info tag.
 543          *
 544          * While testing we discovered that length_info might be unaligned,
 545          * because if USB transactions are merged, the last packet will not
 546          * be padded. Unaligned access might also happen if the length_info
 547          * structure is not present.
 548          */
 549         if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
 550         {
 551                 unsigned int l, k, n;
 552                 for (i = 0, l = 0;; i++) {
 553                         k = le16_to_cpu(get_unaligned(&length_info->length[i]));
 554                         if (k == 0)
 555                                 return;
 556                         n = l+k;
 557                         if (n > length)
 558                                 return;
 559                         zd_mac_rx_irq(mac, buffer+l, k);
 560                         if (i >= 2)
 561                                 return;
 562                         l = (n+3) & ~3;
 563                 }
 564         } else {
 565                 zd_mac_rx_irq(mac, buffer, length);
 566         }
 567 }
 568
 569 static void rx_urb_complete(struct urb *urb)
 570 {
 571         struct zd_usb *usb;
 572         struct zd_usb_rx *rx;
 573         const u8 *buffer;
 574         unsigned int length;
 575
 576         switch (urb->status) {
 577         case 0:
 578                 break;
 579         case -ESHUTDOWN:
 580         case -EINVAL:
 581         case -ENODEV:
 582         case -ENOENT:
 583         case -ECONNRESET:
 584         case -EPIPE:
 585                 return;
 586         default:
 587                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 588                 goto resubmit;
 589         }
 590
 591         buffer = urb->transfer_buffer;
 592         length = urb->actual_length;
 593         usb = urb->context;
 594         rx = &usb->rx;
 595
 596         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 597                 /* If there is an old first fragment, we don't care. */
 598                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 599                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 600                 spin_lock(&rx->lock);
 601                 memcpy(rx->fragment, buffer, length);
 602                 rx->fragment_length = length;
 603                 spin_unlock(&rx->lock);
 604                 goto resubmit;
 605         }
 606
 607         spin_lock(&rx->lock);
 608         if (rx->fragment_length > 0) {
 609                 /* We are on a second fragment, we believe */
 610                 ZD_ASSERT(length + rx->fragment_length <=
 611                           ARRAY_SIZE(rx->fragment));
 612                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 613                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 614                 handle_rx_packet(usb, rx->fragment,
 615                                  rx->fragment_length + length);
 616                 rx->fragment_length = 0;
 617                 spin_unlock(&rx->lock);
 618         } else {
 619                 spin_unlock(&rx->lock);
 620                 handle_rx_packet(usb, buffer, length);
 621         }
 622
 623 resubmit:
 624         usb_submit_urb(urb, GFP_ATOMIC);
 625 }
 626
 627 static struct urb *alloc_urb(struct zd_usb *usb)
 628 {
 629         struct usb_device *udev = zd_usb_to_usbdev(usb);
 630         struct urb *urb;
 631         void *buffer;
 632
 633         urb = usb_alloc_urb(0, GFP_KERNEL);
 634         if (!urb)
 635                 return NULL;
 636         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
 637                                   &urb->transfer_dma);
 638         if (!buffer) {
 639                 usb_free_urb(urb);
 640                 return NULL;
 641         }
 642
 643         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 644                           buffer, USB_MAX_RX_SIZE,
 645                           rx_urb_complete, usb);
 646         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 647
 648         return urb;
 649 }
 650
 651 static void free_urb(struct urb *urb)
 652 {
 653         if (!urb)
 654                 return;
 655         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 656                         urb->transfer_buffer, urb->transfer_dma);
 657         usb_free_urb(urb);
 658 }
 659
 660 int zd_usb_enable_rx(struct zd_usb *usb)
 661 {
 662         int i, r;
 663         struct zd_usb_rx *rx = &usb->rx;
 664         struct urb **urbs;
 665
 666         dev_dbg_f(zd_usb_dev(usb), "\n");
 667
 668         r = -ENOMEM;
 669         urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
 670         if (!urbs)
 671                 goto error;
 672         for (i = 0; i < URBS_COUNT; i++) {
 673                 urbs[i] = alloc_urb(usb);
 674                 if (!urbs[i])
 675                         goto error;
 676         }
 677
 678         ZD_ASSERT(!irqs_disabled());
 679         spin_lock_irq(&rx->lock);
 680         if (rx->urbs) {
 681                 spin_unlock_irq(&rx->lock);
 682                 r = 0;
 683                 goto error;
 684         }
 685         rx->urbs = urbs;
 686         rx->urbs_count = URBS_COUNT;
 687         spin_unlock_irq(&rx->lock);
 688
 689         for (i = 0; i < URBS_COUNT; i++) {
 690                 r = usb_submit_urb(urbs[i], GFP_KERNEL);
 691                 if (r)
 692                         goto error_submit;
 693         }
 694
 695         return 0;
 696 error_submit:
 697         for (i = 0; i < URBS_COUNT; i++) {
 698                 usb_kill_urb(urbs[i]);
 699         }
 700         spin_lock_irq(&rx->lock);
 701         rx->urbs = NULL;
 702         rx->urbs_count = 0;
 703         spin_unlock_irq(&rx->lock);
 704 error:
 705         if (urbs) {
 706                 for (i = 0; i < URBS_COUNT; i++)
 707                         free_urb(urbs[i]);
 708         }
 709         return r;
 710 }
 711
 712 void zd_usb_disable_rx(struct zd_usb *usb)
 713 {
 714         int i;
 715         unsigned long flags;
 716         struct urb **urbs;
 717         unsigned int count;
 718         struct zd_usb_rx *rx = &usb->rx;
 719
 720         spin_lock_irqsave(&rx->lock, flags);
 721         urbs = rx->urbs;
 722         count = rx->urbs_count;
 723         spin_unlock_irqrestore(&rx->lock, flags);
 724         if (!urbs)
 725                 return;
 726
 727         for (i = 0; i < count; i++) {
 728                 usb_kill_urb(urbs[i]);
 729                 free_urb(urbs[i]);
 730         }
 731         kfree(urbs);
 732
 733         spin_lock_irqsave(&rx->lock, flags);
 734         rx->urbs = NULL;
 735         rx->urbs_count = 0;
 736         spin_unlock_irqrestore(&rx->lock, flags);
 737 }
 738
 739 static void tx_urb_complete(struct urb *urb)
 740 {
 741         int r;
 742
 743         switch (urb->status) {
 744         case 0:
 745                 break;
 746         case -ESHUTDOWN:
 747         case -EINVAL:
 748         case -ENODEV:
 749         case -ENOENT:
 750         case -ECONNRESET:
 751         case -EPIPE:
 752                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 753                 break;
 754         default:
 755                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 756                 goto resubmit;
 757         }
 758 free_urb:
 759         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 760                         urb->transfer_buffer, urb->transfer_dma);
 761         usb_free_urb(urb);
 762         return;
 763 resubmit:
 764         r = usb_submit_urb(urb, GFP_ATOMIC);
 765         if (r) {
 766                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 767                 goto free_urb;
 768         }
 769 }
 770
 771 /* Puts the frame on the USB endpoint. It doesn't wait for
 772  * completion. The frame must contain the control set.
 773  */
 774 int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
 775 {
 776         int r;
 777         struct usb_device *udev = zd_usb_to_usbdev(usb);
 778         struct urb *urb;
 779         void *buffer;
 780
 781         urb = usb_alloc_urb(0, GFP_ATOMIC);
 782         if (!urb) {
 783                 r = -ENOMEM;
 784                 goto out;
 785         }
 786
 787         buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
 788                                   &urb->transfer_dma);
 789         if (!buffer) {
 790                 r = -ENOMEM;
 791                 goto error_free_urb;
 792         }
 793         memcpy(buffer, frame, length);
 794
 795         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 796                           buffer, length, tx_urb_complete, NULL);
 797         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 798
 799         r = usb_submit_urb(urb, GFP_ATOMIC);
 800         if (r)
 801                 goto error;
 802         return 0;
 803 error:
 804         usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
 805                         urb->transfer_dma);
 806 error_free_urb:
 807         usb_free_urb(urb);
 808 out:
 809         return r;
 810 }
 811
 812 static inline void init_usb_interrupt(struct zd_usb *usb)
 813 {
 814         struct zd_usb_interrupt *intr = &usb->intr;
 815
 816         spin_lock_init(&intr->lock);
 817         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 818         init_completion(&intr->read_regs.completion);
 819         intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
 820 }
 821
 822 static inline void init_usb_rx(struct zd_usb *usb)
 823 {
 824         struct zd_usb_rx *rx = &usb->rx;
 825         spin_lock_init(&rx->lock);
 826         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 827                 rx->usb_packet_size = 512;
 828         } else {
 829                 rx->usb_packet_size = 64;
 830         }
 831         ZD_ASSERT(rx->fragment_length == 0);
 832 }
 833
 834 static inline void init_usb_tx(struct zd_usb *usb)
 835 {
 836         /* FIXME: at this point we will allocate a fixed number of urb's for
 837          * use in a cyclic scheme */
 838 }
 839
 840 void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
 841                  struct usb_interface *intf)
 842 {
 843         memset(usb, 0, sizeof(*usb));
 844         usb->intf = usb_get_intf(intf);
 845         usb_set_intfdata(usb->intf, netdev);
 846         init_usb_interrupt(usb);
 847         init_usb_tx(usb);
 848         init_usb_rx(usb);
 849 }
 850
 851 void zd_usb_clear(struct zd_usb *usb)
 852 {
 853         usb_set_intfdata(usb->intf, NULL);
 854         usb_put_intf(usb->intf);
 855         ZD_MEMCLEAR(usb, sizeof(*usb));
 856         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
 857 }
 858
 859 static const char *speed(enum usb_device_speed speed)
 860 {
 861         switch (speed) {
 862         case USB_SPEED_LOW:
 863                 return "low";
 864         case USB_SPEED_FULL:
 865                 return "full";
 866         case USB_SPEED_HIGH:
 867                 return "high";
 868         default:
 869                 return "unknown speed";
 870         }
 871 }
 872
 873 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
 874 {
 875         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
 876                 le16_to_cpu(udev->descriptor.idVendor),
 877                 le16_to_cpu(udev->descriptor.idProduct),
 878                 get_bcdDevice(udev),
 879                 speed(udev->speed));
 880 }
 881
 882 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
 883 {
 884         struct usb_device *udev = interface_to_usbdev(usb->intf);
 885         return scnprint_id(udev, buffer, size);
 886 }
 887
 888 #ifdef DEBUG
 889 static void print_id(struct usb_device *udev)
 890 {
 891         char buffer[40];
 892
 893         scnprint_id(udev, buffer, sizeof(buffer));
 894         buffer[sizeof(buffer)-1] = 0;
 895         dev_dbg_f(&udev->dev, "%s\n", buffer);
 896 }
 897 #else
 898 #define print_id(udev) do { } while (0)
 899 #endif
 900
 901 static int eject_installer(struct usb_interface *intf)
 902 {
 903         struct usb_device *udev = interface_to_usbdev(intf);
 904         struct usb_host_interface *iface_desc = &intf->altsetting[0];
 905         struct usb_endpoint_descriptor *endpoint;
 906         unsigned char *cmd;
 907         u8 bulk_out_ep;
 908         int r;
 909
 910         /* Find bulk out endpoint */
 911         endpoint = &iface_desc->endpoint[1].desc;
 912         if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
 913             (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
 914             USB_ENDPOINT_XFER_BULK) {
 915                 bulk_out_ep = endpoint->bEndpointAddress;
 916         } else {
 917                 dev_err(&udev->dev,
 918                         "zd1211rw: Could not find bulk out endpoint\n");
 919                 return -ENODEV;
 920         }
 921
 922         cmd = kzalloc(31, GFP_KERNEL);
 923         if (cmd == NULL)
 924                 return -ENODEV;
 925
 926         /* USB bulk command block */
 927         cmd[0] = 0x55;  /* bulk command signature */
 928         cmd[1] = 0x53;  /* bulk command signature */
 929         cmd[2] = 0x42;  /* bulk command signature */
 930         cmd[3] = 0x43;  /* bulk command signature */
 931         cmd[14] = 6;    /* command length */
 932
 933         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
 934         cmd[19] = 0x2;  /* eject disc */
 935
 936         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
 937         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
 938                 cmd, 31, NULL, 2000);
 939         kfree(cmd);
 940         if (r)
 941                 return r;
 942
 943         /* At this point, the device disconnects and reconnects with the real
 944          * ID numbers. */
 945
 946         usb_set_intfdata(intf, NULL);
 947         return 0;
 948 }
 949
 950 int zd_usb_init_hw(struct zd_usb *usb)
 951 {
 952         int r;
 953         struct zd_mac *mac = zd_usb_to_mac(usb);
 954
 955         dev_dbg_f(zd_usb_dev(usb), "\n");
 956
 957         r = upload_firmware(usb);
 958         if (r) {
 959                 dev_err(zd_usb_dev(usb),
 960                        "couldn't load firmware. Error number %d\n", r);
 961                 return r;
 962         }
 963
 964         r = usb_reset_configuration(zd_usb_to_usbdev(usb));
 965         if (r) {
 966                 dev_dbg_f(zd_usb_dev(usb),
 967                         "couldn't reset configuration. Error number %d\n", r);
 968                 return r;
 969         }
 970
 971         r = zd_mac_init_hw(mac);
 972         if (r) {
 973                 dev_dbg_f(zd_usb_dev(usb),
 974                          "couldn't initialize mac. Error number %d\n", r);
 975                 return r;
 976         }
 977
 978         usb->initialized = 1;
 979         return 0;
 980 }
 981
 982 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
 983 {
 984         int r;
 985         struct zd_usb *usb;
 986         struct usb_device *udev = interface_to_usbdev(intf);
 987         struct net_device *netdev = NULL;
 988
 989         print_id(udev);
 990
 991         if (id->driver_info & DEVICE_INSTALLER)
 992                 return eject_installer(intf);
 993
 994         switch (udev->speed) {
 995         case USB_SPEED_LOW:
 996         case USB_SPEED_FULL:
 997         case USB_SPEED_HIGH:
 998                 break;
 999         default:
1000                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1001                 r = -ENODEV;
1002                 goto error;
1003         }
1004
1005         usb_reset_device(interface_to_usbdev(intf));
1006
1007         netdev = zd_netdev_alloc(intf);
1008         if (netdev == NULL) {
1009                 r = -ENOMEM;
1010                 goto error;
1011         }
1012
1013         usb = &zd_netdev_mac(netdev)->chip.usb;
1014         usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1015
1016         r = zd_mac_preinit_hw(zd_netdev_mac(netdev));
1017         if (r) {
1018                 dev_dbg_f(&intf->dev,
1019                          "couldn't initialize mac. Error number %d\n", r);
1020                 goto error;
1021         }
1022
1023         r = register_netdev(netdev);
1024         if (r) {
1025                 dev_dbg_f(&intf->dev,
1026                          "couldn't register netdev. Error number %d\n", r);
1027                 goto error;
1028         }
1029
1030         dev_dbg_f(&intf->dev, "successful\n");
1031         dev_info(&intf->dev,"%s\n", netdev->name);
1032         return 0;
1033 error:
1034         usb_reset_device(interface_to_usbdev(intf));
1035         zd_netdev_free(netdev);
1036         return r;
1037 }
1038
1039 static void disconnect(struct usb_interface *intf)
1040 {
1041         struct net_device *netdev = zd_intf_to_netdev(intf);
1042         struct zd_mac *mac = zd_netdev_mac(netdev);
1043         struct zd_usb *usb = &mac->chip.usb;
1044
1045         /* Either something really bad happened, or we're just dealing with
1046          * a DEVICE_INSTALLER. */
1047         if (netdev == NULL)
1048                 return;
1049
1050         dev_dbg_f(zd_usb_dev(usb), "\n");
1051
1052         zd_netdev_disconnect(netdev);
1053
1054         /* Just in case something has gone wrong! */
1055         zd_usb_disable_rx(usb);
1056         zd_usb_disable_int(usb);
1057
1058         /* If the disconnect has been caused by a removal of the
1059          * driver module, the reset allows reloading of the driver. If the
1060          * reset will not be executed here, the upload of the firmware in the
1061          * probe function caused by the reloading of the driver will fail.
1062          */
1063         usb_reset_device(interface_to_usbdev(intf));
1064
1065         zd_netdev_free(netdev);
1066         dev_dbg(&intf->dev, "disconnected\n");
1067 }
1068
1069 static struct usb_driver driver = {
1070         .name           = "zd1211rw",
1071         .id_table       = usb_ids,
1072         .probe          = probe,
1073         .disconnect     = disconnect,
1074 };
1075
1076 struct workqueue_struct *zd_workqueue;
1077
1078 static int __init usb_init(void)
1079 {
1080         int r;
1081
1082         pr_debug("%s usb_init()\n", driver.name);
1083
1084         zd_workqueue = create_singlethread_workqueue(driver.name);
1085         if (zd_workqueue == NULL) {
1086                 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1087                 return -ENOMEM;
1088         }
1089
1090         r = usb_register(&driver);
1091         if (r) {
1092                 destroy_workqueue(zd_workqueue);
1093                 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1094                        driver.name, r);
1095                 return r;
1096         }
1097
1098         pr_debug("%s initialized\n", driver.name);
1099         return 0;
1100 }
1101
1102 static void __exit usb_exit(void)
1103 {
1104         pr_debug("%s usb_exit()\n", driver.name);
1105         usb_deregister(&driver);
1106         destroy_workqueue(zd_workqueue);
1107 }
1108
1109 module_init(usb_init);
1110 module_exit(usb_exit);
1111
1112 static int usb_int_regs_length(unsigned int count)
1113 {
1114         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1115 }
1116
1117 static void prepare_read_regs_int(struct zd_usb *usb)
1118 {
1119         struct zd_usb_interrupt *intr = &usb->intr;
1120
1121         spin_lock_irq(&intr->lock);
1122         intr->read_regs_enabled = 1;
1123         INIT_COMPLETION(intr->read_regs.completion);
1124         spin_unlock_irq(&intr->lock);
1125 }
1126
1127 static void disable_read_regs_int(struct zd_usb *usb)
1128 {
1129         struct zd_usb_interrupt *intr = &usb->intr;
1130
1131         spin_lock_irq(&intr->lock);
1132         intr->read_regs_enabled = 0;
1133         spin_unlock_irq(&intr->lock);
1134 }
1135
1136 static int get_results(struct zd_usb *usb, u16 *values,
1137                        struct usb_req_read_regs *req, unsigned int count)
1138 {
1139         int r;
1140         int i;
1141         struct zd_usb_interrupt *intr = &usb->intr;
1142         struct read_regs_int *rr = &intr->read_regs;
1143         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1144
1145         spin_lock_irq(&intr->lock);
1146
1147         r = -EIO;
1148         /* The created block size seems to be larger than expected.
1149          * However results appear to be correct.
1150          */
1151         if (rr->length < usb_int_regs_length(count)) {
1152                 dev_dbg_f(zd_usb_dev(usb),
1153                          "error: actual length %d less than expected %d\n",
1154                          rr->length, usb_int_regs_length(count));
1155                 goto error_unlock;
1156         }
1157         if (rr->length > sizeof(rr->buffer)) {
1158                 dev_dbg_f(zd_usb_dev(usb),
1159                          "error: actual length %d exceeds buffer size %zu\n",
1160                          rr->length, sizeof(rr->buffer));
1161                 goto error_unlock;
1162         }
1163
1164         for (i = 0; i < count; i++) {
1165                 struct reg_data *rd = &regs->regs[i];
1166                 if (rd->addr != req->addr[i]) {
1167                         dev_dbg_f(zd_usb_dev(usb),
1168                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1169                                  le16_to_cpu(rd->addr),
1170                                  le16_to_cpu(req->addr[i]));
1171                         goto error_unlock;
1172                 }
1173                 values[i] = le16_to_cpu(rd->value);
1174         }
1175
1176         r = 0;
1177 error_unlock:
1178         spin_unlock_irq(&intr->lock);
1179         return r;
1180 }
1181
1182 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1183                      const zd_addr_t *addresses, unsigned int count)
1184 {
1185         int r;
1186         int i, req_len, actual_req_len;
1187         struct usb_device *udev;
1188         struct usb_req_read_regs *req = NULL;
1189         unsigned long timeout;
1190
1191         if (count < 1) {
1192                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1193                 return -EINVAL;
1194         }
1195         if (count > USB_MAX_IOREAD16_COUNT) {
1196                 dev_dbg_f(zd_usb_dev(usb),
1197                          "error: count %u exceeds possible max %u\n",
1198                          count, USB_MAX_IOREAD16_COUNT);
1199                 return -EINVAL;
1200         }
1201         if (in_atomic()) {
1202                 dev_dbg_f(zd_usb_dev(usb),
1203                          "error: io in atomic context not supported\n");
1204                 return -EWOULDBLOCK;
1205         }
1206         if (!usb_int_enabled(usb)) {
1207                  dev_dbg_f(zd_usb_dev(usb),
1208                           "error: usb interrupt not enabled\n");
1209                 return -EWOULDBLOCK;
1210         }
1211
1212         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1213         req = kmalloc(req_len, GFP_KERNEL);
1214         if (!req)
1215                 return -ENOMEM;
1216         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1217         for (i = 0; i < count; i++)
1218                 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1219
1220         udev = zd_usb_to_usbdev(usb);
1221         prepare_read_regs_int(usb);
1222         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1223                          req, req_len, &actual_req_len, 1000 /* ms */);
1224         if (r) {
1225                 dev_dbg_f(zd_usb_dev(usb),
1226                         "error in usb_bulk_msg(). Error number %d\n", r);
1227                 goto error;
1228         }
1229         if (req_len != actual_req_len) {
1230                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1231                         " req_len %d != actual_req_len %d\n",
1232                         req_len, actual_req_len);
1233                 r = -EIO;
1234                 goto error;
1235         }
1236
1237         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1238                                               msecs_to_jiffies(1000));
1239         if (!timeout) {
1240                 disable_read_regs_int(usb);
1241                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1242                 r = -ETIMEDOUT;
1243                 goto error;
1244         }
1245
1246         r = get_results(usb, values, req, count);
1247 error:
1248         kfree(req);
1249         return r;
1250 }
1251
1252 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1253                       unsigned int count)
1254 {
1255         int r;
1256         struct usb_device *udev;
1257         struct usb_req_write_regs *req = NULL;
1258         int i, req_len, actual_req_len;
1259
1260         if (count == 0)
1261                 return 0;
1262         if (count > USB_MAX_IOWRITE16_COUNT) {
1263                 dev_dbg_f(zd_usb_dev(usb),
1264                         "error: count %u exceeds possible max %u\n",
1265                         count, USB_MAX_IOWRITE16_COUNT);
1266                 return -EINVAL;
1267         }
1268         if (in_atomic()) {
1269                 dev_dbg_f(zd_usb_dev(usb),
1270                         "error: io in atomic context not supported\n");
1271                 return -EWOULDBLOCK;
1272         }
1273
1274         req_len = sizeof(struct usb_req_write_regs) +
1275                   count * sizeof(struct reg_data);
1276         req = kmalloc(req_len, GFP_KERNEL);
1277         if (!req)
1278                 return -ENOMEM;
1279
1280         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1281         for (i = 0; i < count; i++) {
1282                 struct reg_data *rw  = &req->reg_writes[i];
1283                 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1284                 rw->value = cpu_to_le16(ioreqs[i].value);
1285         }
1286
1287         udev = zd_usb_to_usbdev(usb);
1288         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1289                          req, req_len, &actual_req_len, 1000 /* ms */);
1290         if (r) {
1291                 dev_dbg_f(zd_usb_dev(usb),
1292                         "error in usb_bulk_msg(). Error number %d\n", r);
1293                 goto error;
1294         }
1295         if (req_len != actual_req_len) {
1296                 dev_dbg_f(zd_usb_dev(usb),
1297                         "error in usb_bulk_msg()"
1298                         " req_len %d != actual_req_len %d\n",
1299                         req_len, actual_req_len);
1300                 r = -EIO;
1301                 goto error;
1302         }
1303
1304         /* FALL-THROUGH with r == 0 */
1305 error:
1306         kfree(req);
1307         return r;
1308 }
1309
1310 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1311 {
1312         int r;
1313         struct usb_device *udev;
1314         struct usb_req_rfwrite *req = NULL;
1315         int i, req_len, actual_req_len;
1316         u16 bit_value_template;
1317
1318         if (in_atomic()) {
1319                 dev_dbg_f(zd_usb_dev(usb),
1320                         "error: io in atomic context not supported\n");
1321                 return -EWOULDBLOCK;
1322         }
1323         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1324                 dev_dbg_f(zd_usb_dev(usb),
1325                         "error: bits %d are smaller than"
1326                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1327                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1328                 return -EINVAL;
1329         }
1330         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1331                 dev_dbg_f(zd_usb_dev(usb),
1332                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1333                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1334                 return -EINVAL;
1335         }
1336 #ifdef DEBUG
1337         if (value & (~0UL << bits)) {
1338                 dev_dbg_f(zd_usb_dev(usb),
1339                         "error: value %#09x has bits >= %d set\n",
1340                         value, bits);
1341                 return -EINVAL;
1342         }
1343 #endif /* DEBUG */
1344
1345         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1346
1347         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1348         if (r) {
1349                 dev_dbg_f(zd_usb_dev(usb),
1350                         "error %d: Couldn't read CR203\n", r);
1351                 goto out;
1352         }
1353         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1354
1355         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1356         req = kmalloc(req_len, GFP_KERNEL);
1357         if (!req)
1358                 return -ENOMEM;
1359
1360         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1361         /* 1: 3683a, but not used in ZYDAS driver */
1362         req->value = cpu_to_le16(2);
1363         req->bits = cpu_to_le16(bits);
1364
1365         for (i = 0; i < bits; i++) {
1366                 u16 bv = bit_value_template;
1367                 if (value & (1 << (bits-1-i)))
1368                         bv |= RF_DATA;
1369                 req->bit_values[i] = cpu_to_le16(bv);
1370         }
1371
1372         udev = zd_usb_to_usbdev(usb);
1373         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1374                          req, req_len, &actual_req_len, 1000 /* ms */);
1375         if (r) {
1376                 dev_dbg_f(zd_usb_dev(usb),
1377                         "error in usb_bulk_msg(). Error number %d\n", r);
1378                 goto out;
1379         }
1380         if (req_len != actual_req_len) {
1381                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1382                         " req_len %d != actual_req_len %d\n",
1383                         req_len, actual_req_len);
1384                 r = -EIO;
1385                 goto out;
1386         }
1387
1388         /* FALL-THROUGH with r == 0 */
1389 out:
1390         kfree(req);
1391         return r;
1392 }