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         { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
  76         /* "Driverless" devices that need ejecting */
  77         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
  78         { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
  79         {}
  80 };
  81
  82 MODULE_LICENSE("GPL");
  83 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
  84 MODULE_AUTHOR("Ulrich Kunitz");
  85 MODULE_AUTHOR("Daniel Drake");
  86 MODULE_VERSION("1.0");
  87 MODULE_DEVICE_TABLE(usb, usb_ids);
  88
  89 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
  90 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
  91
  92 /* USB device initialization */
  93
  94 static int request_fw_file(
  95         const struct firmware **fw, const char *name, struct device *device)
  96 {
  97         int r;
  98
  99         dev_dbg_f(device, "fw name %s\n", name);
 100
 101         r = request_firmware(fw, name, device);
 102         if (r)
 103                 dev_err(device,
 104                        "Could not load firmware file %s. Error number %d\n",
 105                        name, r);
 106         return r;
 107 }
 108
 109 static inline u16 get_bcdDevice(const struct usb_device *udev)
 110 {
 111         return le16_to_cpu(udev->descriptor.bcdDevice);
 112 }
 113
 114 enum upload_code_flags {
 115         REBOOT = 1,
 116 };
 117
 118 /* Ensures that MAX_TRANSFER_SIZE is even. */
 119 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
 120
 121 static int upload_code(struct usb_device *udev,
 122         const u8 *data, size_t size, u16 code_offset, int flags)
 123 {
 124         u8 *p;
 125         int r;
 126
 127         /* USB request blocks need "kmalloced" buffers.
 128          */
 129         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
 130         if (!p) {
 131                 dev_err(&udev->dev, "out of memory\n");
 132                 r = -ENOMEM;
 133                 goto error;
 134         }
 135
 136         size &= ~1;
 137         while (size > 0) {
 138                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
 139                         size : MAX_TRANSFER_SIZE;
 140
 141                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
 142
 143                 memcpy(p, data, transfer_size);
 144                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 145                         USB_REQ_FIRMWARE_DOWNLOAD,
 146                         USB_DIR_OUT | USB_TYPE_VENDOR,
 147                         code_offset, 0, p, transfer_size, 1000 /* ms */);
 148                 if (r < 0) {
 149                         dev_err(&udev->dev,
 150                                "USB control request for firmware upload"
 151                                " failed. Error number %d\n", r);
 152                         goto error;
 153                 }
 154                 transfer_size = r & ~1;
 155
 156                 size -= transfer_size;
 157                 data += transfer_size;
 158                 code_offset += transfer_size/sizeof(u16);
 159         }
 160
 161         if (flags & REBOOT) {
 162                 u8 ret;
 163
 164                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 165                         USB_REQ_FIRMWARE_CONFIRM,
 166                         USB_DIR_IN | USB_TYPE_VENDOR,
 167                         0, 0, &ret, sizeof(ret), 5000 /* ms */);
 168                 if (r != sizeof(ret)) {
 169                         dev_err(&udev->dev,
 170                                 "control request firmeware confirmation failed."
 171                                 " Return value %d\n", r);
 172                         if (r >= 0)
 173                                 r = -ENODEV;
 174                         goto error;
 175                 }
 176                 if (ret & 0x80) {
 177                         dev_err(&udev->dev,
 178                                 "Internal error while downloading."
 179                                 " Firmware confirm return value %#04x\n",
 180                                 (unsigned int)ret);
 181                         r = -ENODEV;
 182                         goto error;
 183                 }
 184                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
 185                         (unsigned int)ret);
 186         }
 187
 188         r = 0;
 189 error:
 190         kfree(p);
 191         return r;
 192 }
 193
 194 static u16 get_word(const void *data, u16 offset)
 195 {
 196         const __le16 *p = data;
 197         return le16_to_cpu(p[offset]);
 198 }
 199
 200 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
 201                        const char* postfix)
 202 {
 203         scnprintf(buffer, size, "%s%s",
 204                 usb->is_zd1211b ?
 205                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
 206                 postfix);
 207         return buffer;
 208 }
 209
 210 static int handle_version_mismatch(struct zd_usb *usb,
 211         const struct firmware *ub_fw)
 212 {
 213         struct usb_device *udev = zd_usb_to_usbdev(usb);
 214         const struct firmware *ur_fw = NULL;
 215         int offset;
 216         int r = 0;
 217         char fw_name[128];
 218
 219         r = request_fw_file(&ur_fw,
 220                 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
 221                 &udev->dev);
 222         if (r)
 223                 goto error;
 224
 225         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
 226         if (r)
 227                 goto error;
 228
 229         offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
 230         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
 231                 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
 232
 233         /* At this point, the vendor driver downloads the whole firmware
 234          * image, hacks around with version IDs, and uploads it again,
 235          * completely overwriting the boot code. We do not do this here as
 236          * it is not required on any tested devices, and it is suspected to
 237          * cause problems. */
 238 error:
 239         release_firmware(ur_fw);
 240         return r;
 241 }
 242
 243 static int upload_firmware(struct zd_usb *usb)
 244 {
 245         int r;
 246         u16 fw_bcdDevice;
 247         u16 bcdDevice;
 248         struct usb_device *udev = zd_usb_to_usbdev(usb);
 249         const struct firmware *ub_fw = NULL;
 250         const struct firmware *uph_fw = NULL;
 251         char fw_name[128];
 252
 253         bcdDevice = get_bcdDevice(udev);
 254
 255         r = request_fw_file(&ub_fw,
 256                 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
 257                 &udev->dev);
 258         if (r)
 259                 goto error;
 260
 261         fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
 262
 263         if (fw_bcdDevice != bcdDevice) {
 264                 dev_info(&udev->dev,
 265                         "firmware version %#06x and device bootcode version "
 266                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
 267                 if (bcdDevice <= 0x4313)
 268                         dev_warn(&udev->dev, "device has old bootcode, please "
 269                                 "report success or failure\n");
 270
 271                 r = handle_version_mismatch(usb, ub_fw);
 272                 if (r)
 273                         goto error;
 274         } else {
 275                 dev_dbg_f(&udev->dev,
 276                         "firmware device id %#06x is equal to the "
 277                         "actual device id\n", fw_bcdDevice);
 278         }
 279
 280
 281         r = request_fw_file(&uph_fw,
 282                 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
 283                 &udev->dev);
 284         if (r)
 285                 goto error;
 286
 287         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
 288         if (r) {
 289                 dev_err(&udev->dev,
 290                         "Could not upload firmware code uph. Error number %d\n",
 291                         r);
 292         }
 293
 294         /* FALL-THROUGH */
 295 error:
 296         release_firmware(ub_fw);
 297         release_firmware(uph_fw);
 298         return r;
 299 }
 300
 301 /* Read data from device address space using "firmware interface" which does
 302  * not require firmware to be loaded. */
 303 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
 304 {
 305         int r;
 306         struct usb_device *udev = zd_usb_to_usbdev(usb);
 307
 308         r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 309                 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
 310                 data, len, 5000);
 311         if (r < 0) {
 312                 dev_err(&udev->dev,
 313                         "read over firmware interface failed: %d\n", r);
 314                 return r;
 315         } else if (r != len) {
 316                 dev_err(&udev->dev,
 317                         "incomplete read over firmware interface: %d/%d\n",
 318                         r, len);
 319                 return -EIO;
 320         }
 321
 322         return 0;
 323 }
 324
 325 #define urb_dev(urb) (&(urb)->dev->dev)
 326
 327 static inline void handle_regs_int(struct urb *urb)
 328 {
 329         struct zd_usb *usb = urb->context;
 330         struct zd_usb_interrupt *intr = &usb->intr;
 331         int len;
 332
 333         ZD_ASSERT(in_interrupt());
 334         spin_lock(&intr->lock);
 335
 336         if (intr->read_regs_enabled) {
 337                 intr->read_regs.length = len = urb->actual_length;
 338
 339                 if (len > sizeof(intr->read_regs.buffer))
 340                         len = sizeof(intr->read_regs.buffer);
 341                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
 342                 intr->read_regs_enabled = 0;
 343                 complete(&intr->read_regs.completion);
 344                 goto out;
 345         }
 346
 347         dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
 348 out:
 349         spin_unlock(&intr->lock);
 350 }
 351
 352 static inline void handle_retry_failed_int(struct urb *urb)
 353 {
 354         struct zd_usb *usb = urb->context;
 355         struct zd_mac *mac = zd_usb_to_mac(usb);
 356         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 357
 358         ieee->stats.tx_errors++;
 359         ieee->ieee_stats.tx_retry_limit_exceeded++;
 360         dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
 361 }
 362
 363
 364 static void int_urb_complete(struct urb *urb)
 365 {
 366         int r;
 367         struct usb_int_header *hdr;
 368
 369         switch (urb->status) {
 370         case 0:
 371                 break;
 372         case -ESHUTDOWN:
 373         case -EINVAL:
 374         case -ENODEV:
 375         case -ENOENT:
 376         case -ECONNRESET:
 377         case -EPIPE:
 378                 goto kfree;
 379         default:
 380                 goto resubmit;
 381         }
 382
 383         if (urb->actual_length < sizeof(hdr)) {
 384                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
 385                 goto resubmit;
 386         }
 387
 388         hdr = urb->transfer_buffer;
 389         if (hdr->type != USB_INT_TYPE) {
 390                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
 391                 goto resubmit;
 392         }
 393
 394         switch (hdr->id) {
 395         case USB_INT_ID_REGS:
 396                 handle_regs_int(urb);
 397                 break;
 398         case USB_INT_ID_RETRY_FAILED:
 399                 handle_retry_failed_int(urb);
 400                 break;
 401         default:
 402                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
 403                         (unsigned int)hdr->id);
 404                 goto resubmit;
 405         }
 406
 407 resubmit:
 408         r = usb_submit_urb(urb, GFP_ATOMIC);
 409         if (r) {
 410                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
 411                 goto kfree;
 412         }
 413         return;
 414 kfree:
 415         kfree(urb->transfer_buffer);
 416 }
 417
 418 static inline int int_urb_interval(struct usb_device *udev)
 419 {
 420         switch (udev->speed) {
 421         case USB_SPEED_HIGH:
 422                 return 4;
 423         case USB_SPEED_LOW:
 424                 return 10;
 425         case USB_SPEED_FULL:
 426         default:
 427                 return 1;
 428         }
 429 }
 430
 431 static inline int usb_int_enabled(struct zd_usb *usb)
 432 {
 433         unsigned long flags;
 434         struct zd_usb_interrupt *intr = &usb->intr;
 435         struct urb *urb;
 436
 437         spin_lock_irqsave(&intr->lock, flags);
 438         urb = intr->urb;
 439         spin_unlock_irqrestore(&intr->lock, flags);
 440         return urb != NULL;
 441 }
 442
 443 int zd_usb_enable_int(struct zd_usb *usb)
 444 {
 445         int r;
 446         struct usb_device *udev;
 447         struct zd_usb_interrupt *intr = &usb->intr;
 448         void *transfer_buffer = NULL;
 449         struct urb *urb;
 450
 451         dev_dbg_f(zd_usb_dev(usb), "\n");
 452
 453         urb = usb_alloc_urb(0, GFP_KERNEL);
 454         if (!urb) {
 455                 r = -ENOMEM;
 456                 goto out;
 457         }
 458
 459         ZD_ASSERT(!irqs_disabled());
 460         spin_lock_irq(&intr->lock);
 461         if (intr->urb) {
 462                 spin_unlock_irq(&intr->lock);
 463                 r = 0;
 464                 goto error_free_urb;
 465         }
 466         intr->urb = urb;
 467         spin_unlock_irq(&intr->lock);
 468
 469         /* TODO: make it a DMA buffer */
 470         r = -ENOMEM;
 471         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
 472         if (!transfer_buffer) {
 473                 dev_dbg_f(zd_usb_dev(usb),
 474                         "couldn't allocate transfer_buffer\n");
 475                 goto error_set_urb_null;
 476         }
 477
 478         udev = zd_usb_to_usbdev(usb);
 479         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
 480                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
 481                          int_urb_complete, usb,
 482                          intr->interval);
 483
 484         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
 485         r = usb_submit_urb(urb, GFP_KERNEL);
 486         if (r) {
 487                 dev_dbg_f(zd_usb_dev(usb),
 488                          "Couldn't submit urb. Error number %d\n", r);
 489                 goto error;
 490         }
 491
 492         return 0;
 493 error:
 494         kfree(transfer_buffer);
 495 error_set_urb_null:
 496         spin_lock_irq(&intr->lock);
 497         intr->urb = NULL;
 498         spin_unlock_irq(&intr->lock);
 499 error_free_urb:
 500         usb_free_urb(urb);
 501 out:
 502         return r;
 503 }
 504
 505 void zd_usb_disable_int(struct zd_usb *usb)
 506 {
 507         unsigned long flags;
 508         struct zd_usb_interrupt *intr = &usb->intr;
 509         struct urb *urb;
 510
 511         spin_lock_irqsave(&intr->lock, flags);
 512         urb = intr->urb;
 513         if (!urb) {
 514                 spin_unlock_irqrestore(&intr->lock, flags);
 515                 return;
 516         }
 517         intr->urb = NULL;
 518         spin_unlock_irqrestore(&intr->lock, flags);
 519
 520         usb_kill_urb(urb);
 521         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
 522         usb_free_urb(urb);
 523 }
 524
 525 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 526                              unsigned int length)
 527 {
 528         int i;
 529         struct zd_mac *mac = zd_usb_to_mac(usb);
 530         const struct rx_length_info *length_info;
 531
 532         if (length < sizeof(struct rx_length_info)) {
 533                 /* It's not a complete packet anyhow. */
 534                 struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 535                 ieee->stats.rx_errors++;
 536                 ieee->stats.rx_length_errors++;
 537                 return;
 538         }
 539         length_info = (struct rx_length_info *)
 540                 (buffer + length - sizeof(struct rx_length_info));
 541
 542         /* It might be that three frames are merged into a single URB
 543          * transaction. We have to check for the length info tag.
 544          *
 545          * While testing we discovered that length_info might be unaligned,
 546          * because if USB transactions are merged, the last packet will not
 547          * be padded. Unaligned access might also happen if the length_info
 548          * structure is not present.
 549          */
 550         if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
 551         {
 552                 unsigned int l, k, n;
 553                 for (i = 0, l = 0;; i++) {
 554                         k = le16_to_cpu(get_unaligned(&length_info->length[i]));
 555                         if (k == 0)
 556                                 return;
 557                         n = l+k;
 558                         if (n > length)
 559                                 return;
 560                         zd_mac_rx_irq(mac, buffer+l, k);
 561                         if (i >= 2)
 562                                 return;
 563                         l = (n+3) & ~3;
 564                 }
 565         } else {
 566                 zd_mac_rx_irq(mac, buffer, length);
 567         }
 568 }
 569
 570 static void rx_urb_complete(struct urb *urb)
 571 {
 572         struct zd_usb *usb;
 573         struct zd_usb_rx *rx;
 574         const u8 *buffer;
 575         unsigned int length;
 576
 577         switch (urb->status) {
 578         case 0:
 579                 break;
 580         case -ESHUTDOWN:
 581         case -EINVAL:
 582         case -ENODEV:
 583         case -ENOENT:
 584         case -ECONNRESET:
 585         case -EPIPE:
 586                 return;
 587         default:
 588                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 589                 goto resubmit;
 590         }
 591
 592         buffer = urb->transfer_buffer;
 593         length = urb->actual_length;
 594         usb = urb->context;
 595         rx = &usb->rx;
 596
 597         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 598                 /* If there is an old first fragment, we don't care. */
 599                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
 600                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
 601                 spin_lock(&rx->lock);
 602                 memcpy(rx->fragment, buffer, length);
 603                 rx->fragment_length = length;
 604                 spin_unlock(&rx->lock);
 605                 goto resubmit;
 606         }
 607
 608         spin_lock(&rx->lock);
 609         if (rx->fragment_length > 0) {
 610                 /* We are on a second fragment, we believe */
 611                 ZD_ASSERT(length + rx->fragment_length <=
 612                           ARRAY_SIZE(rx->fragment));
 613                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
 614                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
 615                 handle_rx_packet(usb, rx->fragment,
 616                                  rx->fragment_length + length);
 617                 rx->fragment_length = 0;
 618                 spin_unlock(&rx->lock);
 619         } else {
 620                 spin_unlock(&rx->lock);
 621                 handle_rx_packet(usb, buffer, length);
 622         }
 623
 624 resubmit:
 625         usb_submit_urb(urb, GFP_ATOMIC);
 626 }
 627
 628 static struct urb *alloc_urb(struct zd_usb *usb)
 629 {
 630         struct usb_device *udev = zd_usb_to_usbdev(usb);
 631         struct urb *urb;
 632         void *buffer;
 633
 634         urb = usb_alloc_urb(0, GFP_KERNEL);
 635         if (!urb)
 636                 return NULL;
 637         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
 638                                   &urb->transfer_dma);
 639         if (!buffer) {
 640                 usb_free_urb(urb);
 641                 return NULL;
 642         }
 643
 644         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
 645                           buffer, USB_MAX_RX_SIZE,
 646                           rx_urb_complete, usb);
 647         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 648
 649         return urb;
 650 }
 651
 652 static void free_urb(struct urb *urb)
 653 {
 654         if (!urb)
 655                 return;
 656         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 657                         urb->transfer_buffer, urb->transfer_dma);
 658         usb_free_urb(urb);
 659 }
 660
 661 int zd_usb_enable_rx(struct zd_usb *usb)
 662 {
 663         int i, r;
 664         struct zd_usb_rx *rx = &usb->rx;
 665         struct urb **urbs;
 666
 667         dev_dbg_f(zd_usb_dev(usb), "\n");
 668
 669         r = -ENOMEM;
 670         urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
 671         if (!urbs)
 672                 goto error;
 673         for (i = 0; i < URBS_COUNT; i++) {
 674                 urbs[i] = alloc_urb(usb);
 675                 if (!urbs[i])
 676                         goto error;
 677         }
 678
 679         ZD_ASSERT(!irqs_disabled());
 680         spin_lock_irq(&rx->lock);
 681         if (rx->urbs) {
 682                 spin_unlock_irq(&rx->lock);
 683                 r = 0;
 684                 goto error;
 685         }
 686         rx->urbs = urbs;
 687         rx->urbs_count = URBS_COUNT;
 688         spin_unlock_irq(&rx->lock);
 689
 690         for (i = 0; i < URBS_COUNT; i++) {
 691                 r = usb_submit_urb(urbs[i], GFP_KERNEL);
 692                 if (r)
 693                         goto error_submit;
 694         }
 695
 696         return 0;
 697 error_submit:
 698         for (i = 0; i < URBS_COUNT; i++) {
 699                 usb_kill_urb(urbs[i]);
 700         }
 701         spin_lock_irq(&rx->lock);
 702         rx->urbs = NULL;
 703         rx->urbs_count = 0;
 704         spin_unlock_irq(&rx->lock);
 705 error:
 706         if (urbs) {
 707                 for (i = 0; i < URBS_COUNT; i++)
 708                         free_urb(urbs[i]);
 709         }
 710         return r;
 711 }
 712
 713 void zd_usb_disable_rx(struct zd_usb *usb)
 714 {
 715         int i;
 716         unsigned long flags;
 717         struct urb **urbs;
 718         unsigned int count;
 719         struct zd_usb_rx *rx = &usb->rx;
 720
 721         spin_lock_irqsave(&rx->lock, flags);
 722         urbs = rx->urbs;
 723         count = rx->urbs_count;
 724         spin_unlock_irqrestore(&rx->lock, flags);
 725         if (!urbs)
 726                 return;
 727
 728         for (i = 0; i < count; i++) {
 729                 usb_kill_urb(urbs[i]);
 730                 free_urb(urbs[i]);
 731         }
 732         kfree(urbs);
 733
 734         spin_lock_irqsave(&rx->lock, flags);
 735         rx->urbs = NULL;
 736         rx->urbs_count = 0;
 737         spin_unlock_irqrestore(&rx->lock, flags);
 738 }
 739
 740 static void tx_urb_complete(struct urb *urb)
 741 {
 742         int r;
 743
 744         switch (urb->status) {
 745         case 0:
 746                 break;
 747         case -ESHUTDOWN:
 748         case -EINVAL:
 749         case -ENODEV:
 750         case -ENOENT:
 751         case -ECONNRESET:
 752         case -EPIPE:
 753                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 754                 break;
 755         default:
 756                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
 757                 goto resubmit;
 758         }
 759 free_urb:
 760         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
 761                         urb->transfer_buffer, urb->transfer_dma);
 762         usb_free_urb(urb);
 763         return;
 764 resubmit:
 765         r = usb_submit_urb(urb, GFP_ATOMIC);
 766         if (r) {
 767                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
 768                 goto free_urb;
 769         }
 770 }
 771
 772 /* Puts the frame on the USB endpoint. It doesn't wait for
 773  * completion. The frame must contain the control set.
 774  */
 775 int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
 776 {
 777         int r;
 778         struct usb_device *udev = zd_usb_to_usbdev(usb);
 779         struct urb *urb;
 780         void *buffer;
 781
 782         urb = usb_alloc_urb(0, GFP_ATOMIC);
 783         if (!urb) {
 784                 r = -ENOMEM;
 785                 goto out;
 786         }
 787
 788         buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
 789                                   &urb->transfer_dma);
 790         if (!buffer) {
 791                 r = -ENOMEM;
 792                 goto error_free_urb;
 793         }
 794         memcpy(buffer, frame, length);
 795
 796         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
 797                           buffer, length, tx_urb_complete, NULL);
 798         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 799
 800         r = usb_submit_urb(urb, GFP_ATOMIC);
 801         if (r)
 802                 goto error;
 803         return 0;
 804 error:
 805         usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
 806                         urb->transfer_dma);
 807 error_free_urb:
 808         usb_free_urb(urb);
 809 out:
 810         return r;
 811 }
 812
 813 static inline void init_usb_interrupt(struct zd_usb *usb)
 814 {
 815         struct zd_usb_interrupt *intr = &usb->intr;
 816
 817         spin_lock_init(&intr->lock);
 818         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 819         init_completion(&intr->read_regs.completion);
 820         intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
 821 }
 822
 823 static inline void init_usb_rx(struct zd_usb *usb)
 824 {
 825         struct zd_usb_rx *rx = &usb->rx;
 826         spin_lock_init(&rx->lock);
 827         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
 828                 rx->usb_packet_size = 512;
 829         } else {
 830                 rx->usb_packet_size = 64;
 831         }
 832         ZD_ASSERT(rx->fragment_length == 0);
 833 }
 834
 835 static inline void init_usb_tx(struct zd_usb *usb)
 836 {
 837         /* FIXME: at this point we will allocate a fixed number of urb's for
 838          * use in a cyclic scheme */
 839 }
 840
 841 void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
 842                  struct usb_interface *intf)
 843 {
 844         memset(usb, 0, sizeof(*usb));
 845         usb->intf = usb_get_intf(intf);
 846         usb_set_intfdata(usb->intf, netdev);
 847         init_usb_interrupt(usb);
 848         init_usb_tx(usb);
 849         init_usb_rx(usb);
 850 }
 851
 852 void zd_usb_clear(struct zd_usb *usb)
 853 {
 854         usb_set_intfdata(usb->intf, NULL);
 855         usb_put_intf(usb->intf);
 856         ZD_MEMCLEAR(usb, sizeof(*usb));
 857         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
 858 }
 859
 860 static const char *speed(enum usb_device_speed speed)
 861 {
 862         switch (speed) {
 863         case USB_SPEED_LOW:
 864                 return "low";
 865         case USB_SPEED_FULL:
 866                 return "full";
 867         case USB_SPEED_HIGH:
 868                 return "high";
 869         default:
 870                 return "unknown speed";
 871         }
 872 }
 873
 874 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
 875 {
 876         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
 877                 le16_to_cpu(udev->descriptor.idVendor),
 878                 le16_to_cpu(udev->descriptor.idProduct),
 879                 get_bcdDevice(udev),
 880                 speed(udev->speed));
 881 }
 882
 883 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
 884 {
 885         struct usb_device *udev = interface_to_usbdev(usb->intf);
 886         return scnprint_id(udev, buffer, size);
 887 }
 888
 889 #ifdef DEBUG
 890 static void print_id(struct usb_device *udev)
 891 {
 892         char buffer[40];
 893
 894         scnprint_id(udev, buffer, sizeof(buffer));
 895         buffer[sizeof(buffer)-1] = 0;
 896         dev_dbg_f(&udev->dev, "%s\n", buffer);
 897 }
 898 #else
 899 #define print_id(udev) do { } while (0)
 900 #endif
 901
 902 static int eject_installer(struct usb_interface *intf)
 903 {
 904         struct usb_device *udev = interface_to_usbdev(intf);
 905         struct usb_host_interface *iface_desc = &intf->altsetting[0];
 906         struct usb_endpoint_descriptor *endpoint;
 907         unsigned char *cmd;
 908         u8 bulk_out_ep;
 909         int r;
 910
 911         /* Find bulk out endpoint */
 912         endpoint = &iface_desc->endpoint[1].desc;
 913         if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
 914             (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
 915             USB_ENDPOINT_XFER_BULK) {
 916                 bulk_out_ep = endpoint->bEndpointAddress;
 917         } else {
 918                 dev_err(&udev->dev,
 919                         "zd1211rw: Could not find bulk out endpoint\n");
 920                 return -ENODEV;
 921         }
 922
 923         cmd = kzalloc(31, GFP_KERNEL);
 924         if (cmd == NULL)
 925                 return -ENODEV;
 926
 927         /* USB bulk command block */
 928         cmd[0] = 0x55;  /* bulk command signature */
 929         cmd[1] = 0x53;  /* bulk command signature */
 930         cmd[2] = 0x42;  /* bulk command signature */
 931         cmd[3] = 0x43;  /* bulk command signature */
 932         cmd[14] = 6;    /* command length */
 933
 934         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
 935         cmd[19] = 0x2;  /* eject disc */
 936
 937         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
 938         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
 939                 cmd, 31, NULL, 2000);
 940         kfree(cmd);
 941         if (r)
 942                 return r;
 943
 944         /* At this point, the device disconnects and reconnects with the real
 945          * ID numbers. */
 946
 947         usb_set_intfdata(intf, NULL);
 948         return 0;
 949 }
 950
 951 int zd_usb_init_hw(struct zd_usb *usb)
 952 {
 953         int r;
 954         struct zd_mac *mac = zd_usb_to_mac(usb);
 955
 956         dev_dbg_f(zd_usb_dev(usb), "\n");
 957
 958         r = upload_firmware(usb);
 959         if (r) {
 960                 dev_err(zd_usb_dev(usb),
 961                        "couldn't load firmware. Error number %d\n", r);
 962                 return r;
 963         }
 964
 965         r = usb_reset_configuration(zd_usb_to_usbdev(usb));
 966         if (r) {
 967                 dev_dbg_f(zd_usb_dev(usb),
 968                         "couldn't reset configuration. Error number %d\n", r);
 969                 return r;
 970         }
 971
 972         r = zd_mac_init_hw(mac);
 973         if (r) {
 974                 dev_dbg_f(zd_usb_dev(usb),
 975                          "couldn't initialize mac. Error number %d\n", r);
 976                 return r;
 977         }
 978
 979         usb->initialized = 1;
 980         return 0;
 981 }
 982
 983 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
 984 {
 985         int r;
 986         struct zd_usb *usb;
 987         struct usb_device *udev = interface_to_usbdev(intf);
 988         struct net_device *netdev = NULL;
 989
 990         print_id(udev);
 991
 992         if (id->driver_info & DEVICE_INSTALLER)
 993                 return eject_installer(intf);
 994
 995         switch (udev->speed) {
 996         case USB_SPEED_LOW:
 997         case USB_SPEED_FULL:
 998         case USB_SPEED_HIGH:
 999                 break;
1000         default:
1001                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1002                 r = -ENODEV;
1003                 goto error;
1004         }
1005
1006         usb_reset_device(interface_to_usbdev(intf));
1007
1008         netdev = zd_netdev_alloc(intf);
1009         if (netdev == NULL) {
1010                 r = -ENOMEM;
1011                 goto error;
1012         }
1013
1014         usb = &zd_netdev_mac(netdev)->chip.usb;
1015         usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1016
1017         r = zd_mac_preinit_hw(zd_netdev_mac(netdev));
1018         if (r) {
1019                 dev_dbg_f(&intf->dev,
1020                          "couldn't initialize mac. Error number %d\n", r);
1021                 goto error;
1022         }
1023
1024         r = register_netdev(netdev);
1025         if (r) {
1026                 dev_dbg_f(&intf->dev,
1027                          "couldn't register netdev. Error number %d\n", r);
1028                 goto error;
1029         }
1030
1031         dev_dbg_f(&intf->dev, "successful\n");
1032         dev_info(&intf->dev,"%s\n", netdev->name);
1033         return 0;
1034 error:
1035         usb_reset_device(interface_to_usbdev(intf));
1036         zd_netdev_free(netdev);
1037         return r;
1038 }
1039
1040 static void disconnect(struct usb_interface *intf)
1041 {
1042         struct net_device *netdev = zd_intf_to_netdev(intf);
1043         struct zd_mac *mac = zd_netdev_mac(netdev);
1044         struct zd_usb *usb = &mac->chip.usb;
1045
1046         /* Either something really bad happened, or we're just dealing with
1047          * a DEVICE_INSTALLER. */
1048         if (netdev == NULL)
1049                 return;
1050
1051         dev_dbg_f(zd_usb_dev(usb), "\n");
1052
1053         zd_netdev_disconnect(netdev);
1054
1055         /* Just in case something has gone wrong! */
1056         zd_usb_disable_rx(usb);
1057         zd_usb_disable_int(usb);
1058
1059         /* If the disconnect has been caused by a removal of the
1060          * driver module, the reset allows reloading of the driver. If the
1061          * reset will not be executed here, the upload of the firmware in the
1062          * probe function caused by the reloading of the driver will fail.
1063          */
1064         usb_reset_device(interface_to_usbdev(intf));
1065
1066         zd_netdev_free(netdev);
1067         dev_dbg(&intf->dev, "disconnected\n");
1068 }
1069
1070 static struct usb_driver driver = {
1071         .name           = "zd1211rw",
1072         .id_table       = usb_ids,
1073         .probe          = probe,
1074         .disconnect     = disconnect,
1075 };
1076
1077 struct workqueue_struct *zd_workqueue;
1078
1079 static int __init usb_init(void)
1080 {
1081         int r;
1082
1083         pr_debug("%s usb_init()\n", driver.name);
1084
1085         zd_workqueue = create_singlethread_workqueue(driver.name);
1086         if (zd_workqueue == NULL) {
1087                 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1088                 return -ENOMEM;
1089         }
1090
1091         r = usb_register(&driver);
1092         if (r) {
1093                 destroy_workqueue(zd_workqueue);
1094                 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1095                        driver.name, r);
1096                 return r;
1097         }
1098
1099         pr_debug("%s initialized\n", driver.name);
1100         return 0;
1101 }
1102
1103 static void __exit usb_exit(void)
1104 {
1105         pr_debug("%s usb_exit()\n", driver.name);
1106         usb_deregister(&driver);
1107         destroy_workqueue(zd_workqueue);
1108 }
1109
1110 module_init(usb_init);
1111 module_exit(usb_exit);
1112
1113 static int usb_int_regs_length(unsigned int count)
1114 {
1115         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1116 }
1117
1118 static void prepare_read_regs_int(struct zd_usb *usb)
1119 {
1120         struct zd_usb_interrupt *intr = &usb->intr;
1121
1122         spin_lock_irq(&intr->lock);
1123         intr->read_regs_enabled = 1;
1124         INIT_COMPLETION(intr->read_regs.completion);
1125         spin_unlock_irq(&intr->lock);
1126 }
1127
1128 static void disable_read_regs_int(struct zd_usb *usb)
1129 {
1130         struct zd_usb_interrupt *intr = &usb->intr;
1131
1132         spin_lock_irq(&intr->lock);
1133         intr->read_regs_enabled = 0;
1134         spin_unlock_irq(&intr->lock);
1135 }
1136
1137 static int get_results(struct zd_usb *usb, u16 *values,
1138                        struct usb_req_read_regs *req, unsigned int count)
1139 {
1140         int r;
1141         int i;
1142         struct zd_usb_interrupt *intr = &usb->intr;
1143         struct read_regs_int *rr = &intr->read_regs;
1144         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1145
1146         spin_lock_irq(&intr->lock);
1147
1148         r = -EIO;
1149         /* The created block size seems to be larger than expected.
1150          * However results appear to be correct.
1151          */
1152         if (rr->length < usb_int_regs_length(count)) {
1153                 dev_dbg_f(zd_usb_dev(usb),
1154                          "error: actual length %d less than expected %d\n",
1155                          rr->length, usb_int_regs_length(count));
1156                 goto error_unlock;
1157         }
1158         if (rr->length > sizeof(rr->buffer)) {
1159                 dev_dbg_f(zd_usb_dev(usb),
1160                          "error: actual length %d exceeds buffer size %zu\n",
1161                          rr->length, sizeof(rr->buffer));
1162                 goto error_unlock;
1163         }
1164
1165         for (i = 0; i < count; i++) {
1166                 struct reg_data *rd = &regs->regs[i];
1167                 if (rd->addr != req->addr[i]) {
1168                         dev_dbg_f(zd_usb_dev(usb),
1169                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1170                                  le16_to_cpu(rd->addr),
1171                                  le16_to_cpu(req->addr[i]));
1172                         goto error_unlock;
1173                 }
1174                 values[i] = le16_to_cpu(rd->value);
1175         }
1176
1177         r = 0;
1178 error_unlock:
1179         spin_unlock_irq(&intr->lock);
1180         return r;
1181 }
1182
1183 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1184                      const zd_addr_t *addresses, unsigned int count)
1185 {
1186         int r;
1187         int i, req_len, actual_req_len;
1188         struct usb_device *udev;
1189         struct usb_req_read_regs *req = NULL;
1190         unsigned long timeout;
1191
1192         if (count < 1) {
1193                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1194                 return -EINVAL;
1195         }
1196         if (count > USB_MAX_IOREAD16_COUNT) {
1197                 dev_dbg_f(zd_usb_dev(usb),
1198                          "error: count %u exceeds possible max %u\n",
1199                          count, USB_MAX_IOREAD16_COUNT);
1200                 return -EINVAL;
1201         }
1202         if (in_atomic()) {
1203                 dev_dbg_f(zd_usb_dev(usb),
1204                          "error: io in atomic context not supported\n");
1205                 return -EWOULDBLOCK;
1206         }
1207         if (!usb_int_enabled(usb)) {
1208                  dev_dbg_f(zd_usb_dev(usb),
1209                           "error: usb interrupt not enabled\n");
1210                 return -EWOULDBLOCK;
1211         }
1212
1213         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1214         req = kmalloc(req_len, GFP_KERNEL);
1215         if (!req)
1216                 return -ENOMEM;
1217         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1218         for (i = 0; i < count; i++)
1219                 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1220
1221         udev = zd_usb_to_usbdev(usb);
1222         prepare_read_regs_int(usb);
1223         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1224                          req, req_len, &actual_req_len, 1000 /* ms */);
1225         if (r) {
1226                 dev_dbg_f(zd_usb_dev(usb),
1227                         "error in usb_bulk_msg(). Error number %d\n", r);
1228                 goto error;
1229         }
1230         if (req_len != actual_req_len) {
1231                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1232                         " req_len %d != actual_req_len %d\n",
1233                         req_len, actual_req_len);
1234                 r = -EIO;
1235                 goto error;
1236         }
1237
1238         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1239                                               msecs_to_jiffies(1000));
1240         if (!timeout) {
1241                 disable_read_regs_int(usb);
1242                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1243                 r = -ETIMEDOUT;
1244                 goto error;
1245         }
1246
1247         r = get_results(usb, values, req, count);
1248 error:
1249         kfree(req);
1250         return r;
1251 }
1252
1253 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1254                       unsigned int count)
1255 {
1256         int r;
1257         struct usb_device *udev;
1258         struct usb_req_write_regs *req = NULL;
1259         int i, req_len, actual_req_len;
1260
1261         if (count == 0)
1262                 return 0;
1263         if (count > USB_MAX_IOWRITE16_COUNT) {
1264                 dev_dbg_f(zd_usb_dev(usb),
1265                         "error: count %u exceeds possible max %u\n",
1266                         count, USB_MAX_IOWRITE16_COUNT);
1267                 return -EINVAL;
1268         }
1269         if (in_atomic()) {
1270                 dev_dbg_f(zd_usb_dev(usb),
1271                         "error: io in atomic context not supported\n");
1272                 return -EWOULDBLOCK;
1273         }
1274
1275         req_len = sizeof(struct usb_req_write_regs) +
1276                   count * sizeof(struct reg_data);
1277         req = kmalloc(req_len, GFP_KERNEL);
1278         if (!req)
1279                 return -ENOMEM;
1280
1281         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1282         for (i = 0; i < count; i++) {
1283                 struct reg_data *rw  = &req->reg_writes[i];
1284                 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1285                 rw->value = cpu_to_le16(ioreqs[i].value);
1286         }
1287
1288         udev = zd_usb_to_usbdev(usb);
1289         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1290                          req, req_len, &actual_req_len, 1000 /* ms */);
1291         if (r) {
1292                 dev_dbg_f(zd_usb_dev(usb),
1293                         "error in usb_bulk_msg(). Error number %d\n", r);
1294                 goto error;
1295         }
1296         if (req_len != actual_req_len) {
1297                 dev_dbg_f(zd_usb_dev(usb),
1298                         "error in usb_bulk_msg()"
1299                         " req_len %d != actual_req_len %d\n",
1300                         req_len, actual_req_len);
1301                 r = -EIO;
1302                 goto error;
1303         }
1304
1305         /* FALL-THROUGH with r == 0 */
1306 error:
1307         kfree(req);
1308         return r;
1309 }
1310
1311 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1312 {
1313         int r;
1314         struct usb_device *udev;
1315         struct usb_req_rfwrite *req = NULL;
1316         int i, req_len, actual_req_len;
1317         u16 bit_value_template;
1318
1319         if (in_atomic()) {
1320                 dev_dbg_f(zd_usb_dev(usb),
1321                         "error: io in atomic context not supported\n");
1322                 return -EWOULDBLOCK;
1323         }
1324         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1325                 dev_dbg_f(zd_usb_dev(usb),
1326                         "error: bits %d are smaller than"
1327                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1328                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1329                 return -EINVAL;
1330         }
1331         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1332                 dev_dbg_f(zd_usb_dev(usb),
1333                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1334                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1335                 return -EINVAL;
1336         }
1337 #ifdef DEBUG
1338         if (value & (~0UL << bits)) {
1339                 dev_dbg_f(zd_usb_dev(usb),
1340                         "error: value %#09x has bits >= %d set\n",
1341                         value, bits);
1342                 return -EINVAL;
1343         }
1344 #endif /* DEBUG */
1345
1346         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1347
1348         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1349         if (r) {
1350                 dev_dbg_f(zd_usb_dev(usb),
1351                         "error %d: Couldn't read CR203\n", r);
1352                 goto out;
1353         }
1354         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1355
1356         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1357         req = kmalloc(req_len, GFP_KERNEL);
1358         if (!req)
1359                 return -ENOMEM;
1360
1361         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1362         /* 1: 3683a, but not used in ZYDAS driver */
1363         req->value = cpu_to_le16(2);
1364         req->bits = cpu_to_le16(bits);
1365
1366         for (i = 0; i < bits; i++) {
1367                 u16 bv = bit_value_template;
1368                 if (value & (1 << (bits-1-i)))
1369                         bv |= RF_DATA;
1370                 req->bit_values[i] = cpu_to_le16(bv);
1371         }
1372
1373         udev = zd_usb_to_usbdev(usb);
1374         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1375                          req, req_len, &actual_req_len, 1000 /* ms */);
1376         if (r) {
1377                 dev_dbg_f(zd_usb_dev(usb),
1378                         "error in usb_bulk_msg(). Error number %d\n", r);
1379                 goto out;
1380         }
1381         if (req_len != actual_req_len) {
1382                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1383                         " req_len %d != actual_req_len %d\n",
1384                         req_len, actual_req_len);
1385                 r = -EIO;
1386                 goto out;
1387         }
1388
1389         /* FALL-THROUGH with r == 0 */
1390 out:
1391         kfree(req);
1392         return r;
1393 }