drivers/net/wimax/i2400m/usb.c

   1 /*
   2  * Intel Wireless WiMAX Connection 2400m
   3  * Linux driver model glue for USB device, reset & fw upload
   4  *
   5  *
   6  * Copyright (C) 2007-2008 Intel Corporation <linux-wimax@intel.com>
   7  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
   8  * Yanir Lubetkin <yanirx.lubetkin@intel.com>
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License version
  12  * 2 as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  22  * 02110-1301, USA.
  23  *
  24  *
  25  * See i2400m-usb.h for a general description of this driver.
  26  *
  27  * This file implements driver model glue, and hook ups for the
  28  * generic driver to implement the bus-specific functions (device
  29  * communication setup/tear down, firmware upload and resetting).
  30  *
  31  * ROADMAP
  32  *
  33  * i2400mu_probe()
  34  *   alloc_netdev()...
  35  *     i2400mu_netdev_setup()
  36  *       i2400mu_init()
  37  *       i2400m_netdev_setup()
  38  *   i2400m_setup()...
  39  *
  40  * i2400mu_disconnect
  41  *   i2400m_release()
  42  *   free_netdev()
  43  *
  44  * i2400mu_suspend()
  45  *   i2400m_cmd_enter_powersave()
  46  *   i2400mu_notification_release()
  47  *
  48  * i2400mu_resume()
  49  *   i2400mu_notification_setup()
  50  *
  51  * i2400mu_bus_dev_start()        Called by i2400m_dev_start() [who is
  52  *   i2400mu_tx_setup()           called by i2400m_setup()]
  53  *   i2400mu_rx_setup()
  54  *   i2400mu_notification_setup()
  55  *
  56  * i2400mu_bus_dev_stop()         Called by i2400m_dev_stop() [who is
  57  *   i2400mu_notification_release()  called by i2400m_release()]
  58  *   i2400mu_rx_release()
  59  *   i2400mu_tx_release()
  60  *
  61  * i2400mu_bus_reset()            Called by i2400m->bus_reset
  62  *   __i2400mu_reset()
  63  *     __i2400mu_send_barker()
  64  *   usb_reset_device()
  65  */
  66 #include "i2400m-usb.h"
  67 #include <linux/wimax/i2400m.h>
  68 #include <linux/debugfs.h>
  69
  70
  71 #define D_SUBMODULE usb
  72 #include "usb-debug-levels.h"
  73
  74
  75 /* Our firmware file name */
  76 static const char *i2400mu_bus_fw_names[] = {
  77 #define I2400MU_FW_FILE_NAME_v1_4 "i2400m-fw-usb-1.4.sbcf"
  78         I2400MU_FW_FILE_NAME_v1_4,
  79 #define I2400MU_FW_FILE_NAME_v1_3 "i2400m-fw-usb-1.3.sbcf"
  80         I2400MU_FW_FILE_NAME_v1_3,
  81         NULL,
  82 };
  83
  84
  85 static
  86 int i2400mu_bus_dev_start(struct i2400m *i2400m)
  87 {
  88         int result;
  89         struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m);
  90         struct device *dev = &i2400mu->usb_iface->dev;
  91
  92         d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
  93         result = i2400mu_tx_setup(i2400mu);
  94         if (result < 0)
  95                 goto error_usb_tx_setup;
  96         result = i2400mu_rx_setup(i2400mu);
  97         if (result < 0)
  98                 goto error_usb_rx_setup;
  99         result = i2400mu_notification_setup(i2400mu);
 100         if (result < 0)
 101                 goto error_notif_setup;
 102         d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result);
 103         return result;
 104
 105 error_notif_setup:
 106         i2400mu_rx_release(i2400mu);
 107 error_usb_rx_setup:
 108         i2400mu_tx_release(i2400mu);
 109 error_usb_tx_setup:
 110         d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
 111         return result;
 112 }
 113
 114
 115 static
 116 void i2400mu_bus_dev_stop(struct i2400m *i2400m)
 117 {
 118         struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m);
 119         struct device *dev = &i2400mu->usb_iface->dev;
 120
 121         d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
 122         i2400mu_notification_release(i2400mu);
 123         i2400mu_rx_release(i2400mu);
 124         i2400mu_tx_release(i2400mu);
 125         d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
 126 }
 127
 128
 129 /*
 130  * Sends a barker buffer to the device
 131  *
 132  * This helper will allocate a kmalloced buffer and use it to transmit
 133  * (then free it). Reason for this is that other arches cannot use
 134  * stack/vmalloc/text areas for DMA transfers.
 135  *
 136  * Error recovery here is simpler: anything is considered a hard error
 137  * and will move the reset code to use a last-resort bus-based reset.
 138  */
 139 static
 140 int __i2400mu_send_barker(struct i2400mu *i2400mu,
 141                           const __le32 *barker,
 142                           size_t barker_size,
 143                           unsigned endpoint)
 144 {
 145         struct usb_endpoint_descriptor *epd = NULL;
 146         int pipe, actual_len, ret;
 147         struct device *dev = &i2400mu->usb_iface->dev;
 148         void *buffer;
 149         int do_autopm = 1;
 150
 151         ret = usb_autopm_get_interface(i2400mu->usb_iface);
 152         if (ret < 0) {
 153                 dev_err(dev, "RESET: can't get autopm: %d\n", ret);
 154                 do_autopm = 0;
 155         }
 156         ret = -ENOMEM;
 157         buffer = kmalloc(barker_size, GFP_KERNEL);
 158         if (buffer == NULL)
 159                 goto error_kzalloc;
 160         epd = usb_get_epd(i2400mu->usb_iface, endpoint);
 161         pipe = usb_sndbulkpipe(i2400mu->usb_dev, epd->bEndpointAddress);
 162         memcpy(buffer, barker, barker_size);
 163         ret = usb_bulk_msg(i2400mu->usb_dev, pipe, buffer, barker_size,
 164                            &actual_len, HZ);
 165         if (ret < 0) {
 166                 if (ret != -EINVAL)
 167                         dev_err(dev, "E: barker error: %d\n", ret);
 168         } else if (actual_len != barker_size) {
 169                 dev_err(dev, "E: only %d bytes transmitted\n", actual_len);
 170                 ret = -EIO;
 171         }
 172         kfree(buffer);
 173 error_kzalloc:
 174         if (do_autopm)
 175                 usb_autopm_put_interface(i2400mu->usb_iface);
 176         return ret;
 177 }
 178
 179
 180 /*
 181  * Reset a device at different levels (warm, cold or bus)
 182  *
 183  * @i2400m: device descriptor
 184  * @reset_type: soft, warm or bus reset (I2400M_RT_WARM/SOFT/BUS)
 185  *
 186  * Warm and cold resets get a USB reset if they fail.
 187  *
 188  * Warm reset:
 189  *
 190  * The device will be fully reset internally, but won't be
 191  * disconnected from the USB bus (so no reenumeration will
 192  * happen). Firmware upload will be neccessary.
 193  *
 194  * The device will send a reboot barker in the notification endpoint
 195  * that will trigger the driver to reinitialize the state
 196  * automatically from notif.c:i2400m_notification_grok() into
 197  * i2400m_dev_bootstrap_delayed().
 198  *
 199  * Cold and bus (USB) reset:
 200  *
 201  * The device will be fully reset internally, disconnected from the
 202  * USB bus an a reenumeration will happen. Firmware upload will be
 203  * neccessary. Thus, we don't do any locking or struct
 204  * reinitialization, as we are going to be fully disconnected and
 205  * reenumerated.
 206  *
 207  * Note we need to return -ENODEV if a warm reset was requested and we
 208  * had to resort to a bus reset. See i2400m_op_reset(), wimax_reset()
 209  * and wimax_dev->op_reset.
 210  *
 211  * WARNING: no driver state saved/fixed
 212  */
 213 static
 214 int i2400mu_bus_reset(struct i2400m *i2400m, enum i2400m_reset_type rt)
 215 {
 216         int result;
 217         struct i2400mu *i2400mu =
 218                 container_of(i2400m, struct i2400mu, i2400m);
 219         struct device *dev = i2400m_dev(i2400m);
 220         static const __le32 i2400m_WARM_BOOT_BARKER[4] = {
 221                 cpu_to_le32(I2400M_WARM_RESET_BARKER),
 222                 cpu_to_le32(I2400M_WARM_RESET_BARKER),
 223                 cpu_to_le32(I2400M_WARM_RESET_BARKER),
 224                 cpu_to_le32(I2400M_WARM_RESET_BARKER),
 225         };
 226         static const __le32 i2400m_COLD_BOOT_BARKER[4] = {
 227                 cpu_to_le32(I2400M_COLD_RESET_BARKER),
 228                 cpu_to_le32(I2400M_COLD_RESET_BARKER),
 229                 cpu_to_le32(I2400M_COLD_RESET_BARKER),
 230                 cpu_to_le32(I2400M_COLD_RESET_BARKER),
 231         };
 232
 233         d_fnstart(3, dev, "(i2400m %p rt %u)\n", i2400m, rt);
 234         if (rt == I2400M_RT_WARM)
 235                 result = __i2400mu_send_barker(
 236                         i2400mu, i2400m_WARM_BOOT_BARKER,
 237                         sizeof(i2400m_WARM_BOOT_BARKER),
 238                         i2400mu->endpoint_cfg.bulk_out);
 239         else if (rt == I2400M_RT_COLD)
 240                 result = __i2400mu_send_barker(
 241                         i2400mu, i2400m_COLD_BOOT_BARKER,
 242                         sizeof(i2400m_COLD_BOOT_BARKER),
 243                         i2400mu->endpoint_cfg.reset_cold);
 244         else if (rt == I2400M_RT_BUS) {
 245 do_bus_reset:
 246                 result = usb_reset_device(i2400mu->usb_dev);
 247                 switch (result) {
 248                 case 0:
 249                 case -EINVAL:   /* device is gone */
 250                 case -ENODEV:
 251                 case -ENOENT:
 252                 case -ESHUTDOWN:
 253                         result = rt == I2400M_RT_WARM ? -ENODEV : 0;
 254                         break;  /* We assume the device is disconnected */
 255                 default:
 256                         dev_err(dev, "USB reset failed (%d), giving up!\n",
 257                                 result);
 258                 }
 259         } else {
 260                 result = -EINVAL;       /* shut gcc up in certain arches */
 261                 BUG();
 262         }
 263         if (result < 0
 264             && result != -EINVAL        /* device is gone */
 265             && rt != I2400M_RT_BUS) {
 266                 dev_err(dev, "%s reset failed (%d); trying USB reset\n",
 267                         rt == I2400M_RT_WARM ? "warm" : "cold", result);
 268                 rt = I2400M_RT_BUS;
 269                 goto do_bus_reset;
 270         }
 271         d_fnend(3, dev, "(i2400m %p rt %u) = %d\n", i2400m, rt, result);
 272         return result;
 273 }
 274
 275
 276 static
 277 void i2400mu_netdev_setup(struct net_device *net_dev)
 278 {
 279         struct i2400m *i2400m = net_dev_to_i2400m(net_dev);
 280         struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m);
 281         i2400mu_init(i2400mu);
 282         i2400m_netdev_setup(net_dev);
 283 }
 284
 285
 286 /*
 287  * Debug levels control; see debug.h
 288  */
 289 struct d_level D_LEVEL[] = {
 290         D_SUBMODULE_DEFINE(usb),
 291         D_SUBMODULE_DEFINE(fw),
 292         D_SUBMODULE_DEFINE(notif),
 293         D_SUBMODULE_DEFINE(rx),
 294         D_SUBMODULE_DEFINE(tx),
 295 };
 296 size_t D_LEVEL_SIZE = ARRAY_SIZE(D_LEVEL);
 297
 298
 299 #define __debugfs_register(prefix, name, parent)                        \
 300 do {                                                                    \
 301         result = d_level_register_debugfs(prefix, name, parent);        \
 302         if (result < 0)                                                 \
 303                 goto error;                                             \
 304 } while (0)
 305
 306
 307 static
 308 int i2400mu_debugfs_add(struct i2400mu *i2400mu)
 309 {
 310         int result;
 311         struct device *dev = &i2400mu->usb_iface->dev;
 312         struct dentry *dentry = i2400mu->i2400m.wimax_dev.debugfs_dentry;
 313         struct dentry *fd;
 314
 315         dentry = debugfs_create_dir("i2400m-usb", dentry);
 316         result = PTR_ERR(dentry);
 317         if (IS_ERR(dentry)) {
 318                 if (result == -ENODEV)
 319                         result = 0;     /* No debugfs support */
 320                 goto error;
 321         }
 322         i2400mu->debugfs_dentry = dentry;
 323         __debugfs_register("dl_", usb, dentry);
 324         __debugfs_register("dl_", fw, dentry);
 325         __debugfs_register("dl_", notif, dentry);
 326         __debugfs_register("dl_", rx, dentry);
 327         __debugfs_register("dl_", tx, dentry);
 328
 329         /* Don't touch these if you don't know what you are doing */
 330         fd = debugfs_create_u8("rx_size_auto_shrink", 0600, dentry,
 331                                &i2400mu->rx_size_auto_shrink);
 332         result = PTR_ERR(fd);
 333         if (IS_ERR(fd) && result != -ENODEV) {
 334                 dev_err(dev, "Can't create debugfs entry "
 335                         "rx_size_auto_shrink: %d\n", result);
 336                 goto error;
 337         }
 338
 339         fd = debugfs_create_size_t("rx_size", 0600, dentry,
 340                                    &i2400mu->rx_size);
 341         result = PTR_ERR(fd);
 342         if (IS_ERR(fd) && result != -ENODEV) {
 343                 dev_err(dev, "Can't create debugfs entry "
 344                         "rx_size: %d\n", result);
 345                 goto error;
 346         }
 347
 348         return 0;
 349
 350 error:
 351         debugfs_remove_recursive(i2400mu->debugfs_dentry);
 352         return result;
 353 }
 354
 355
 356 static struct device_type i2400mu_type = {
 357         .name   = "wimax",
 358 };
 359
 360 /*
 361  * Probe a i2400m interface and register it
 362  *
 363  * @iface:   USB interface to link to
 364  * @id:      USB class/subclass/protocol id
 365  * @returns: 0 if ok, < 0 errno code on error.
 366  *
 367  * Alloc a net device, initialize the bus-specific details and then
 368  * calls the bus-generic initialization routine. That will register
 369  * the wimax and netdev devices, upload the firmware [using
 370  * _bus_bm_*()], call _bus_dev_start() to finalize the setup of the
 371  * communication with the device and then will start to talk to it to
 372  * finnish setting it up.
 373  */
 374 static
 375 int i2400mu_probe(struct usb_interface *iface,
 376                   const struct usb_device_id *id)
 377 {
 378         int result;
 379         struct net_device *net_dev;
 380         struct device *dev = &iface->dev;
 381         struct i2400m *i2400m;
 382         struct i2400mu *i2400mu;
 383         struct usb_device *usb_dev = interface_to_usbdev(iface);
 384
 385         if (usb_dev->speed != USB_SPEED_HIGH)
 386                 dev_err(dev, "device not connected as high speed\n");
 387
 388         /* Allocate instance [calls i2400m_netdev_setup() on it]. */
 389         result = -ENOMEM;
 390         net_dev = alloc_netdev(sizeof(*i2400mu), "wmx%d",
 391                                i2400mu_netdev_setup);
 392         if (net_dev == NULL) {
 393                 dev_err(dev, "no memory for network device instance\n");
 394                 goto error_alloc_netdev;
 395         }
 396         SET_NETDEV_DEV(net_dev, dev);
 397         SET_NETDEV_DEVTYPE(net_dev, &i2400mu_type);
 398         i2400m = net_dev_to_i2400m(net_dev);
 399         i2400mu = container_of(i2400m, struct i2400mu, i2400m);
 400         i2400m->wimax_dev.net_dev = net_dev;
 401         i2400mu->usb_dev = usb_get_dev(usb_dev);
 402         i2400mu->usb_iface = iface;
 403         usb_set_intfdata(iface, i2400mu);
 404
 405         i2400m->bus_tx_block_size = I2400MU_BLK_SIZE;
 406         i2400m->bus_pl_size_max = I2400MU_PL_SIZE_MAX;
 407         i2400m->bus_dev_start = i2400mu_bus_dev_start;
 408         i2400m->bus_dev_stop = i2400mu_bus_dev_stop;
 409         i2400m->bus_tx_kick = i2400mu_bus_tx_kick;
 410         i2400m->bus_reset = i2400mu_bus_reset;
 411         i2400m->bus_bm_retries = I2400M_USB_BOOT_RETRIES;
 412         i2400m->bus_bm_cmd_send = i2400mu_bus_bm_cmd_send;
 413         i2400m->bus_bm_wait_for_ack = i2400mu_bus_bm_wait_for_ack;
 414         i2400m->bus_fw_names = i2400mu_bus_fw_names;
 415         i2400m->bus_bm_mac_addr_impaired = 0;
 416
 417         {
 418                 i2400mu->endpoint_cfg.bulk_out = 0;
 419                 i2400mu->endpoint_cfg.notification = 1;
 420                 i2400mu->endpoint_cfg.reset_cold = 2;
 421                 i2400mu->endpoint_cfg.bulk_in = 3;
 422         }
 423 #ifdef CONFIG_PM
 424         iface->needs_remote_wakeup = 1;         /* autosuspend (15s delay) */
 425         device_init_wakeup(dev, 1);
 426         usb_dev->autosuspend_delay = 15 * HZ;
 427         usb_dev->autosuspend_disabled = 0;
 428 #endif
 429
 430         result = i2400m_bm_buf_alloc(i2400m);
 431         if (result < 0) {
 432                 dev_err(dev, "cannot allocate USB bootmode buffer\n");
 433                 goto error_bm_buf_alloc;
 434         }
 435
 436         result = i2400m_setup(i2400m, I2400M_BRI_MAC_REINIT);
 437         if (result < 0) {
 438                 dev_err(dev, "cannot setup device: %d\n", result);
 439                 goto error_setup;
 440         }
 441         result = i2400mu_debugfs_add(i2400mu);
 442         if (result < 0) {
 443                 dev_err(dev, "Can't register i2400mu's debugfs: %d\n", result);
 444                 goto error_debugfs_add;
 445         }
 446         return 0;
 447
 448 error_debugfs_add:
 449         i2400m_release(i2400m);
 450 error_setup:
 451         i2400m_bm_buf_free(i2400m);
 452 error_bm_buf_alloc:
 453         usb_set_intfdata(iface, NULL);
 454         usb_put_dev(i2400mu->usb_dev);
 455         free_netdev(net_dev);
 456 error_alloc_netdev:
 457         return result;
 458 }
 459
 460
 461 /*
 462  * Disconect a i2400m from the system.
 463  *
 464  * i2400m_stop() has been called before, so al the rx and tx contexts
 465  * have been taken down already. Make sure the queue is stopped,
 466  * unregister netdev and i2400m, free and kill.
 467  */
 468 static
 469 void i2400mu_disconnect(struct usb_interface *iface)
 470 {
 471         struct i2400mu *i2400mu = usb_get_intfdata(iface);
 472         struct i2400m *i2400m = &i2400mu->i2400m;
 473         struct net_device *net_dev = i2400m->wimax_dev.net_dev;
 474         struct device *dev = &iface->dev;
 475
 476         d_fnstart(3, dev, "(iface %p i2400m %p)\n", iface, i2400m);
 477
 478         debugfs_remove_recursive(i2400mu->debugfs_dentry);
 479         i2400m_release(i2400m);
 480         usb_set_intfdata(iface, NULL);
 481         usb_put_dev(i2400mu->usb_dev);
 482         free_netdev(net_dev);
 483         d_fnend(3, dev, "(iface %p i2400m %p) = void\n", iface, i2400m);
 484 }
 485
 486
 487 /*
 488  * Get the device ready for USB port or system standby and hibernation
 489  *
 490  * USB port and system standby are handled the same.
 491  *
 492  * When the system hibernates, the USB device is powered down and then
 493  * up, so we don't really have to do much here, as it will be seen as
 494  * a reconnect. Still for simplicity we consider this case the same as
 495  * suspend, so that the device has a chance to do notify the base
 496  * station (if connected).
 497  *
 498  * So at the end, the three cases require common handling.
 499  *
 500  * If at the time of this call the device's firmware is not loaded,
 501  * nothing has to be done.
 502  *
 503  * If the firmware is loaded, we need to:
 504  *
 505  *  - tell the device to go into host interface power save mode, wait
 506  *    for it to ack
 507  *
 508  *    This is quite more interesting than it is; we need to execute a
 509  *    command, but this time, we don't want the code in usb-{tx,rx}.c
 510  *    to call the usb_autopm_get/put_interface() barriers as it'd
 511  *    deadlock, so we need to decrement i2400mu->do_autopm, that acts
 512  *    as a poor man's semaphore. Ugly, but it works.
 513  *
 514  *    As well, the device might refuse going to sleep for whichever
 515  *    reason. In this case we just fail. For system suspend/hibernate,
 516  *    we *can't* fail. We look at usb_dev->auto_pm to see if the
 517  *    suspend call comes from the USB stack or from the system and act
 518  *    in consequence.
 519  *
 520  *  - stop the notification endpoint polling
 521  */
 522 static
 523 int i2400mu_suspend(struct usb_interface *iface, pm_message_t pm_msg)
 524 {
 525         int result = 0;
 526         struct device *dev = &iface->dev;
 527         struct i2400mu *i2400mu = usb_get_intfdata(iface);
 528 #ifdef CONFIG_PM
 529         struct usb_device *usb_dev = i2400mu->usb_dev;
 530 #endif
 531         unsigned is_autosuspend = 0;
 532         struct i2400m *i2400m = &i2400mu->i2400m;
 533
 534 #ifdef CONFIG_PM
 535         if (usb_dev->auto_pm > 0)
 536                 is_autosuspend = 1;
 537 #endif
 538
 539         d_fnstart(3, dev, "(iface %p pm_msg %u)\n", iface, pm_msg.event);
 540         if (i2400m->updown == 0)
 541                 goto no_firmware;
 542         if (i2400m->state == I2400M_SS_DATA_PATH_CONNECTED && is_autosuspend) {
 543                 /* ugh -- the device is connected and this suspend
 544                  * request is an autosuspend one (not a system standby
 545                  * / hibernate).
 546                  *
 547                  * The only way the device can go to standby is if the
 548                  * link with the base station is in IDLE mode; that
 549                  * were the case, we'd be in status
 550                  * I2400M_SS_CONNECTED_IDLE. But we are not.
 551                  *
 552                  * If we *tell* him to go power save now, it'll reset
 553                  * as a precautionary measure, so if this is an
 554                  * autosuspend thing, say no and it'll come back
 555                  * later, when the link is IDLE
 556                  */
 557                 result = -EBADF;
 558                 d_printf(1, dev, "fw up, link up, not-idle, autosuspend: "
 559                          "not entering powersave\n");
 560                 goto error_not_now;
 561         }
 562         d_printf(1, dev, "fw up: entering powersave\n");
 563         atomic_dec(&i2400mu->do_autopm);
 564         result = i2400m_cmd_enter_powersave(i2400m);
 565         atomic_inc(&i2400mu->do_autopm);
 566         if (result < 0 && !is_autosuspend) {
 567                 /* System suspend, can't fail */
 568                 dev_err(dev, "failed to suspend, will reset on resume\n");
 569                 result = 0;
 570         }
 571         if (result < 0)
 572                 goto error_enter_powersave;
 573         i2400mu_notification_release(i2400mu);
 574         d_printf(1, dev, "powersave requested\n");
 575 error_enter_powersave:
 576 error_not_now:
 577 no_firmware:
 578         d_fnend(3, dev, "(iface %p pm_msg %u) = %d\n",
 579                 iface, pm_msg.event, result);
 580         return result;
 581 }
 582
 583
 584 static
 585 int i2400mu_resume(struct usb_interface *iface)
 586 {
 587         int ret = 0;
 588         struct device *dev = &iface->dev;
 589         struct i2400mu *i2400mu = usb_get_intfdata(iface);
 590         struct i2400m *i2400m = &i2400mu->i2400m;
 591
 592         d_fnstart(3, dev, "(iface %p)\n", iface);
 593         if (i2400m->updown == 0) {
 594                 d_printf(1, dev, "fw was down, no resume neeed\n");
 595                 goto out;
 596         }
 597         d_printf(1, dev, "fw was up, resuming\n");
 598         i2400mu_notification_setup(i2400mu);
 599         /* USB has flow control, so we don't need to give it time to
 600          * come back; otherwise, we'd use something like a get-state
 601          * command... */
 602 out:
 603         d_fnend(3, dev, "(iface %p) = %d\n", iface, ret);
 604         return ret;
 605 }
 606
 607
 608 static
 609 struct usb_device_id i2400mu_id_table[] = {
 610         { USB_DEVICE(0x8086, 0x0181) },
 611         { USB_DEVICE(0x8086, 0x1403) },
 612         { USB_DEVICE(0x8086, 0x1405) },
 613         { USB_DEVICE(0x8086, 0x0180) },
 614         { USB_DEVICE(0x8086, 0x0182) },
 615         { USB_DEVICE(0x8086, 0x1406) },
 616         { USB_DEVICE(0x8086, 0x1403) },
 617         { },
 618 };
 619 MODULE_DEVICE_TABLE(usb, i2400mu_id_table);
 620
 621
 622 static
 623 struct usb_driver i2400mu_driver = {
 624         .name = KBUILD_MODNAME,
 625         .suspend = i2400mu_suspend,
 626         .resume = i2400mu_resume,
 627         .probe = i2400mu_probe,
 628         .disconnect = i2400mu_disconnect,
 629         .id_table = i2400mu_id_table,
 630         .supports_autosuspend = 1,
 631 };
 632
 633 static
 634 int __init i2400mu_driver_init(void)
 635 {
 636         return usb_register(&i2400mu_driver);
 637 }
 638 module_init(i2400mu_driver_init);
 639
 640
 641 static
 642 void __exit i2400mu_driver_exit(void)
 643 {
 644         flush_scheduled_work(); /* for the stuff we schedule from sysfs.c */
 645         usb_deregister(&i2400mu_driver);
 646 }
 647 module_exit(i2400mu_driver_exit);
 648
 649 MODULE_AUTHOR("Intel Corporation <linux-wimax@intel.com>");
 650 MODULE_DESCRIPTION("Intel 2400M WiMAX networking for USB");
 651 MODULE_LICENSE("GPL");
 652 MODULE_FIRMWARE(I2400MU_FW_FILE_NAME_v1_4);
 653 MODULE_FIRMWARE(I2400MU_FW_FILE_NAME_v1_3);