1/****************************************************************
   2 *
   3 *     kaweth.c - driver for KL5KUSB101 based USB->Ethernet
   4 *
   5 *     (c) 2000 Interlan Communications
   6 *     (c) 2000 Stephane Alnet
   7 *     (C) 2001 Brad Hards
   8 *     (C) 2002 Oliver Neukum
   9 *
  10 *     Original author: The Zapman <zapman@interlan.net>
  11 *     Inspired by, and much credit goes to Michael Rothwell
  12 *     <rothwell@interlan.net> for the test equipment, help, and patience
  13 *     Based off of (and with thanks to) Petko Manolov's pegaus.c driver.
  14 *     Also many thanks to Joel Silverman and Ed Surprenant at Kawasaki
  15 *     for providing the firmware and driver resources.
  16 *
  17 *     This program is free software; you can redistribute it and/or
  18 *     modify it under the terms of the GNU General Public License as
  19 *     published by the Free Software Foundation; either version 2, or
  20 *     (at your option) any later version.
  21 *
  22 *     This program is distributed in the hope that it will be useful,
  23 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  24 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25 *     GNU General Public License for more details.
  26 *
  27 *     You should have received a copy of the GNU General Public License
  28 *     along with this program; if not, see <http://www.gnu.org/licenses/>.
  29 *
  30 ****************************************************************/
  31
  32/* TODO:
  33 * Develop test procedures for USB net interfaces
  34 * Run test procedures
  35 * Fix bugs from previous two steps
  36 * Snoop other OSs for any tricks we're not doing
  37 * Reduce arbitrary timeouts
  38 * Smart multicast support
  39 * Temporary MAC change support
  40 * Tunable SOFs parameter - ioctl()?
  41 * Ethernet stats collection
  42 * Code formatting improvements
  43 */
  44
  45#include <linux/module.h>
  46#include <linux/slab.h>
  47#include <linux/string.h>
  48#include <linux/delay.h>
  49#include <linux/netdevice.h>
  50#include <linux/etherdevice.h>
  51#include <linux/usb.h>
  52#include <linux/types.h>
  53#include <linux/ethtool.h>
  54#include <linux/dma-mapping.h>
  55#include <linux/wait.h>
  56#include <linux/firmware.h>
  57#include <asm/uaccess.h>
  58#include <asm/byteorder.h>
  59
  60#undef DEBUG
  61
  62#define KAWETH_MTU			1514
  63#define KAWETH_BUF_SIZE			1664
  64#define KAWETH_TX_TIMEOUT		(5 * HZ)
  65#define KAWETH_SCRATCH_SIZE		32
  66#define KAWETH_FIRMWARE_BUF_SIZE	4096
  67#define KAWETH_CONTROL_TIMEOUT		(30000)
  68
  69#define KAWETH_STATUS_BROKEN		0x0000001
  70#define KAWETH_STATUS_CLOSING		0x0000002
  71#define KAWETH_STATUS_SUSPENDING	0x0000004
  72
  73#define KAWETH_STATUS_BLOCKED (KAWETH_STATUS_CLOSING | KAWETH_STATUS_SUSPENDING)
  74
  75#define KAWETH_PACKET_FILTER_PROMISCUOUS	0x01
  76#define KAWETH_PACKET_FILTER_ALL_MULTICAST	0x02
  77#define KAWETH_PACKET_FILTER_DIRECTED		0x04
  78#define KAWETH_PACKET_FILTER_BROADCAST		0x08
  79#define KAWETH_PACKET_FILTER_MULTICAST		0x10
  80
  81/* Table 7 */
  82#define KAWETH_COMMAND_GET_ETHERNET_DESC	0x00
  83#define KAWETH_COMMAND_MULTICAST_FILTERS        0x01
  84#define KAWETH_COMMAND_SET_PACKET_FILTER	0x02
  85#define KAWETH_COMMAND_STATISTICS               0x03
  86#define KAWETH_COMMAND_SET_TEMP_MAC     	0x06
  87#define KAWETH_COMMAND_GET_TEMP_MAC             0x07
  88#define KAWETH_COMMAND_SET_URB_SIZE		0x08
  89#define KAWETH_COMMAND_SET_SOFS_WAIT		0x09
  90#define KAWETH_COMMAND_SCAN			0xFF
  91
  92#define KAWETH_SOFS_TO_WAIT			0x05
  93
  94#define INTBUFFERSIZE				4
  95
  96#define STATE_OFFSET				0
  97#define STATE_MASK				0x40
  98#define	STATE_SHIFT				5
  99
 100#define IS_BLOCKED(s) (s & KAWETH_STATUS_BLOCKED)
 101
 102
 103MODULE_AUTHOR("Michael Zappe <zapman@interlan.net>, Stephane Alnet <stephane@u-picardie.fr>, Brad Hards <bhards@bigpond.net.au> and Oliver Neukum <oliver@neukum.org>");
 104MODULE_DESCRIPTION("KL5USB101 USB Ethernet driver");
 105MODULE_LICENSE("GPL");
 106MODULE_FIRMWARE("kaweth/new_code.bin");
 107MODULE_FIRMWARE("kaweth/new_code_fix.bin");
 108MODULE_FIRMWARE("kaweth/trigger_code.bin");
 109MODULE_FIRMWARE("kaweth/trigger_code_fix.bin");
 110
 111static const char driver_name[] = "kaweth";
 112
 113static int kaweth_probe(
 114		struct usb_interface *intf,
 115		const struct usb_device_id *id	/* from id_table */
 116	);
 117static void kaweth_disconnect(struct usb_interface *intf);
 118static int kaweth_internal_control_msg(struct usb_device *usb_dev,
 119				       unsigned int pipe,
 120				       struct usb_ctrlrequest *cmd, void *data,
 121				       int len, int timeout);
 122static int kaweth_suspend(struct usb_interface *intf, pm_message_t message);
 123static int kaweth_resume(struct usb_interface *intf);
 124
 125/****************************************************************
 126 *     usb_device_id
 127 ****************************************************************/
 128static struct usb_device_id usb_klsi_table[] = {
 129	{ USB_DEVICE(0x03e8, 0x0008) }, /* AOX Endpoints USB Ethernet */
 130	{ USB_DEVICE(0x04bb, 0x0901) }, /* I-O DATA USB-ET/T */
 131	{ USB_DEVICE(0x0506, 0x03e8) }, /* 3Com 3C19250 */
 132	{ USB_DEVICE(0x0506, 0x11f8) }, /* 3Com 3C460 */
 133	{ USB_DEVICE(0x0557, 0x2002) }, /* ATEN USB Ethernet */
 134	{ USB_DEVICE(0x0557, 0x4000) }, /* D-Link DSB-650C */
 135	{ USB_DEVICE(0x0565, 0x0002) }, /* Peracom Enet */
 136	{ USB_DEVICE(0x0565, 0x0003) }, /* Optus@Home UEP1045A */
 137	{ USB_DEVICE(0x0565, 0x0005) }, /* Peracom Enet2 */
 138	{ USB_DEVICE(0x05e9, 0x0008) }, /* KLSI KL5KUSB101B */
 139	{ USB_DEVICE(0x05e9, 0x0009) }, /* KLSI KL5KUSB101B (Board change) */
 140	{ USB_DEVICE(0x066b, 0x2202) }, /* Linksys USB10T */
 141	{ USB_DEVICE(0x06e1, 0x0008) }, /* ADS USB-10BT */
 142	{ USB_DEVICE(0x06e1, 0x0009) }, /* ADS USB-10BT */
 143	{ USB_DEVICE(0x0707, 0x0100) }, /* SMC 2202USB */
 144	{ USB_DEVICE(0x07aa, 0x0001) }, /* Correga K.K. */
 145	{ USB_DEVICE(0x07b8, 0x4000) }, /* D-Link DU-E10 */
 146	{ USB_DEVICE(0x07c9, 0xb010) }, /* Allied Telesyn AT-USB10 USB Ethernet Adapter */
 147	{ USB_DEVICE(0x0846, 0x1001) }, /* NetGear EA-101 */
 148	{ USB_DEVICE(0x0846, 0x1002) }, /* NetGear EA-101 */
 149	{ USB_DEVICE(0x085a, 0x0008) }, /* PortGear Ethernet Adapter */
 150	{ USB_DEVICE(0x085a, 0x0009) }, /* PortGear Ethernet Adapter */
 151	{ USB_DEVICE(0x087d, 0x5704) }, /* Jaton USB Ethernet Device Adapter */
 152	{ USB_DEVICE(0x0951, 0x0008) }, /* Kingston Technology USB Ethernet Adapter */
 153	{ USB_DEVICE(0x095a, 0x3003) }, /* Portsmith Express Ethernet Adapter */
 154	{ USB_DEVICE(0x10bd, 0x1427) }, /* ASANTE USB To Ethernet Adapter */
 155	{ USB_DEVICE(0x1342, 0x0204) }, /* Mobility USB-Ethernet Adapter */
 156	{ USB_DEVICE(0x13d2, 0x0400) }, /* Shark Pocket Adapter */
 157	{ USB_DEVICE(0x1485, 0x0001) },	/* Silicom U2E */
 158	{ USB_DEVICE(0x1485, 0x0002) }, /* Psion Dacom Gold Port Ethernet */
 159	{ USB_DEVICE(0x1645, 0x0005) }, /* Entrega E45 */
 160	{ USB_DEVICE(0x1645, 0x0008) }, /* Entrega USB Ethernet Adapter */
 161	{ USB_DEVICE(0x1645, 0x8005) }, /* PortGear Ethernet Adapter */
 162	{ USB_DEVICE(0x1668, 0x0323) }, /* Actiontec USB Ethernet */
 163	{ USB_DEVICE(0x2001, 0x4000) }, /* D-link DSB-650C */
 164	{} /* Null terminator */
 165};
 166
 167MODULE_DEVICE_TABLE (usb, usb_klsi_table);
 168
 169/****************************************************************
 170 *     kaweth_driver
 171 ****************************************************************/
 172static struct usb_driver kaweth_driver = {
 173	.name =		driver_name,
 174	.probe =	kaweth_probe,
 175	.disconnect =	kaweth_disconnect,
 176	.suspend =	kaweth_suspend,
 177	.resume =	kaweth_resume,
 178	.id_table =     usb_klsi_table,
 179	.supports_autosuspend =	1,
 180	.disable_hub_initiated_lpm = 1,
 181};
 182
 183typedef __u8 eth_addr_t[6];
 184
 185/****************************************************************
 186 *     usb_eth_dev
 187 ****************************************************************/
 188struct usb_eth_dev {
 189	char *name;
 190	__u16 vendor;
 191	__u16 device;
 192	void *pdata;
 193};
 194
 195/****************************************************************
 196 *     kaweth_ethernet_configuration
 197 *     Refer Table 8
 198 ****************************************************************/
 199struct kaweth_ethernet_configuration
 200{
 201	__u8 size;
 202	__u8 reserved1;
 203	__u8 reserved2;
 204	eth_addr_t hw_addr;
 205	__u32 statistics_mask;
 206	__le16 segment_size;
 207	__u16 max_multicast_filters;
 208	__u8 reserved3;
 209} __packed;
 210
 211/****************************************************************
 212 *     kaweth_device
 213 ****************************************************************/
 214struct kaweth_device
 215{
 216	spinlock_t device_lock;
 217
 218	__u32 status;
 219	int end;
 220	int suspend_lowmem_rx;
 221	int suspend_lowmem_ctrl;
 222	int linkstate;
 223	int opened;
 224	struct delayed_work lowmem_work;
 225
 226	struct usb_device *dev;
 227	struct usb_interface *intf;
 228	struct net_device *net;
 229	wait_queue_head_t term_wait;
 230
 231	struct urb *rx_urb;
 232	struct urb *tx_urb;
 233	struct urb *irq_urb;
 234
 235	dma_addr_t intbufferhandle;
 236	__u8 *intbuffer;
 237	dma_addr_t rxbufferhandle;
 238	__u8 *rx_buf;
 239
 240	
 241	struct sk_buff *tx_skb;
 242
 243	__u8 *firmware_buf;
 244	__u8 scratch[KAWETH_SCRATCH_SIZE];
 245	__u16 packet_filter_bitmap;
 246
 247	struct kaweth_ethernet_configuration configuration;
 248
 249	struct net_device_stats stats;
 250};
 251
 252/****************************************************************
 253 *     kaweth_control
 254 ****************************************************************/
 255static int kaweth_control(struct kaweth_device *kaweth,
 256			  unsigned int pipe,
 257			  __u8 request,
 258			  __u8 requesttype,
 259			  __u16 value,
 260			  __u16 index,
 261			  void *data,
 262			  __u16 size,
 263			  int timeout)
 264{
 265	struct usb_ctrlrequest *dr;
 266	int retval;
 267
 268	netdev_dbg(kaweth->net, "kaweth_control()\n");
 269
 270	if(in_interrupt()) {
 271		netdev_dbg(kaweth->net, "in_interrupt()\n");
 272		return -EBUSY;
 273	}
 274
 275	dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
 276	if (!dr)
 277		return -ENOMEM;
 278
 279	dr->bRequestType = requesttype;
 280	dr->bRequest = request;
 281	dr->wValue = cpu_to_le16(value);
 282	dr->wIndex = cpu_to_le16(index);
 283	dr->wLength = cpu_to_le16(size);
 284
 285	retval = kaweth_internal_control_msg(kaweth->dev,
 286					     pipe,
 287					     dr,
 288					     data,
 289					     size,
 290					     timeout);
 291
 292	kfree(dr);
 293	return retval;
 294}
 295
 296/****************************************************************
 297 *     kaweth_read_configuration
 298 ****************************************************************/
 299static int kaweth_read_configuration(struct kaweth_device *kaweth)
 300{
 301	int retval;
 302
 303	netdev_dbg(kaweth->net, "Reading kaweth configuration\n");
 304
 305	retval = kaweth_control(kaweth,
 306				usb_rcvctrlpipe(kaweth->dev, 0),
 307				KAWETH_COMMAND_GET_ETHERNET_DESC,
 308				USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
 309				0,
 310				0,
 311				(void *)&kaweth->configuration,
 312				sizeof(kaweth->configuration),
 313				KAWETH_CONTROL_TIMEOUT);
 314
 315	return retval;
 316}
 317
 318/****************************************************************
 319 *     kaweth_set_urb_size
 320 ****************************************************************/
 321static int kaweth_set_urb_size(struct kaweth_device *kaweth, __u16 urb_size)
 322{
 323	int retval;
 324
 325	netdev_dbg(kaweth->net, "Setting URB size to %d\n", (unsigned)urb_size);
 326
 327	retval = kaweth_control(kaweth,
 328				usb_sndctrlpipe(kaweth->dev, 0),
 329				KAWETH_COMMAND_SET_URB_SIZE,
 330				USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 331				urb_size,
 332				0,
 333				(void *)&kaweth->scratch,
 334				0,
 335				KAWETH_CONTROL_TIMEOUT);
 336
 337	return retval;
 338}
 339
 340/****************************************************************
 341 *     kaweth_set_sofs_wait
 342 ****************************************************************/
 343static int kaweth_set_sofs_wait(struct kaweth_device *kaweth, __u16 sofs_wait)
 344{
 345	int retval;
 346
 347	netdev_dbg(kaweth->net, "Set SOFS wait to %d\n", (unsigned)sofs_wait);
 348
 349	retval = kaweth_control(kaweth,
 350				usb_sndctrlpipe(kaweth->dev, 0),
 351				KAWETH_COMMAND_SET_SOFS_WAIT,
 352				USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 353				sofs_wait,
 354				0,
 355				(void *)&kaweth->scratch,
 356				0,
 357				KAWETH_CONTROL_TIMEOUT);
 358
 359	return retval;
 360}
 361
 362/****************************************************************
 363 *     kaweth_set_receive_filter
 364 ****************************************************************/
 365static int kaweth_set_receive_filter(struct kaweth_device *kaweth,
 366				     __u16 receive_filter)
 367{
 368	int retval;
 369
 370	netdev_dbg(kaweth->net, "Set receive filter to %d\n",
 371		   (unsigned)receive_filter);
 372
 373	retval = kaweth_control(kaweth,
 374				usb_sndctrlpipe(kaweth->dev, 0),
 375				KAWETH_COMMAND_SET_PACKET_FILTER,
 376				USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 377				receive_filter,
 378				0,
 379				(void *)&kaweth->scratch,
 380				0,
 381				KAWETH_CONTROL_TIMEOUT);
 382
 383	return retval;
 384}
 385
 386/****************************************************************
 387 *     kaweth_download_firmware
 388 ****************************************************************/
 389static int kaweth_download_firmware(struct kaweth_device *kaweth,
 390				    const char *fwname,
 391				    __u8 interrupt,
 392				    __u8 type)
 393{
 394	const struct firmware *fw;
 395	int data_len;
 396	int ret;
 397
 398	ret = request_firmware(&fw, fwname, &kaweth->dev->dev);
 399	if (ret) {
 400		dev_err(&kaweth->intf->dev, "Firmware request failed\n");
 401		return ret;
 402	}
 403
 404	if (fw->size > KAWETH_FIRMWARE_BUF_SIZE) {
 405		dev_err(&kaweth->intf->dev, "Firmware too big: %zu\n",
 406			fw->size);
 407		release_firmware(fw);
 408		return -ENOSPC;
 409	}
 410	data_len = fw->size;
 411	memcpy(kaweth->firmware_buf, fw->data, fw->size);
 412
 413	release_firmware(fw);
 414
 415	kaweth->firmware_buf[2] = (data_len & 0xFF) - 7;
 416	kaweth->firmware_buf[3] = data_len >> 8;
 417	kaweth->firmware_buf[4] = type;
 418	kaweth->firmware_buf[5] = interrupt;
 419
 420	netdev_dbg(kaweth->net, "High: %i, Low:%i\n", kaweth->firmware_buf[3],
 421		   kaweth->firmware_buf[2]);
 422
 423	netdev_dbg(kaweth->net,
 424		   "Downloading firmware at %p to kaweth device at %p\n",
 425		   kaweth->firmware_buf, kaweth);
 426	netdev_dbg(kaweth->net, "Firmware length: %d\n", data_len);
 427
 428	return kaweth_control(kaweth,
 429		              usb_sndctrlpipe(kaweth->dev, 0),
 430			      KAWETH_COMMAND_SCAN,
 431			      USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 432			      0,
 433			      0,
 434			      (void *)kaweth->firmware_buf,
 435			      data_len,
 436			      KAWETH_CONTROL_TIMEOUT);
 437}
 438
 439/****************************************************************
 440 *     kaweth_trigger_firmware
 441 ****************************************************************/
 442static int kaweth_trigger_firmware(struct kaweth_device *kaweth,
 443				   __u8 interrupt)
 444{
 445	kaweth->firmware_buf[0] = 0xB6;
 446	kaweth->firmware_buf[1] = 0xC3;
 447	kaweth->firmware_buf[2] = 0x01;
 448	kaweth->firmware_buf[3] = 0x00;
 449	kaweth->firmware_buf[4] = 0x06;
 450	kaweth->firmware_buf[5] = interrupt;
 451	kaweth->firmware_buf[6] = 0x00;
 452	kaweth->firmware_buf[7] = 0x00;
 453
 454	netdev_dbg(kaweth->net, "Triggering firmware\n");
 455
 456	return kaweth_control(kaweth,
 457			      usb_sndctrlpipe(kaweth->dev, 0),
 458			      KAWETH_COMMAND_SCAN,
 459			      USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 460			      0,
 461			      0,
 462			      (void *)kaweth->firmware_buf,
 463			      8,
 464			      KAWETH_CONTROL_TIMEOUT);
 465}
 466
 467/****************************************************************
 468 *     kaweth_reset
 469 ****************************************************************/
 470static int kaweth_reset(struct kaweth_device *kaweth)
 471{
 472	int result;
 473
 474	netdev_dbg(kaweth->net, "kaweth_reset(%p)\n", kaweth);
 475	result = usb_reset_configuration(kaweth->dev);
 476	mdelay(10);
 477
 478	netdev_dbg(kaweth->net, "kaweth_reset() returns %d.\n", result);
 479
 480	return result;
 481}
 482
 483static void kaweth_usb_receive(struct urb *);
 484static int kaweth_resubmit_rx_urb(struct kaweth_device *, gfp_t);
 485
 486/****************************************************************
 487	int_callback
 488*****************************************************************/
 489
 490static void kaweth_resubmit_int_urb(struct kaweth_device *kaweth, gfp_t mf)
 491{
 492	int status;
 493
 494	status = usb_submit_urb (kaweth->irq_urb, mf);
 495	if (unlikely(status == -ENOMEM)) {
 496		kaweth->suspend_lowmem_ctrl = 1;
 497		schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
 498	} else {
 499		kaweth->suspend_lowmem_ctrl = 0;
 500	}
 501
 502	if (status)
 503		dev_err(&kaweth->intf->dev,
 504			"can't resubmit intr, %s-%s, status %d\n",
 505			kaweth->dev->bus->bus_name,
 506			kaweth->dev->devpath, status);
 507}
 508
 509static void int_callback(struct urb *u)
 510{
 511	struct kaweth_device *kaweth = u->context;
 512	int act_state;
 513	int status = u->status;
 514
 515	switch (status) {
 516	case 0:			/* success */
 517		break;
 518	case -ECONNRESET:	/* unlink */
 519	case -ENOENT:
 520	case -ESHUTDOWN:
 521		return;
 522	/* -EPIPE:  should clear the halt */
 523	default:		/* error */
 524		goto resubmit;
 525	}
 526
 527	/* we check the link state to report changes */
 528	if (kaweth->linkstate != (act_state = ( kaweth->intbuffer[STATE_OFFSET] | STATE_MASK) >> STATE_SHIFT)) {
 529		if (act_state)
 530			netif_carrier_on(kaweth->net);
 531		else
 532			netif_carrier_off(kaweth->net);
 533
 534		kaweth->linkstate = act_state;
 535	}
 536resubmit:
 537	kaweth_resubmit_int_urb(kaweth, GFP_ATOMIC);
 538}
 539
 540static void kaweth_resubmit_tl(struct work_struct *work)
 541{
 542	struct kaweth_device *kaweth =
 543		container_of(work, struct kaweth_device, lowmem_work.work);
 544
 545	if (IS_BLOCKED(kaweth->status))
 546		return;
 547
 548	if (kaweth->suspend_lowmem_rx)
 549		kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
 550
 551	if (kaweth->suspend_lowmem_ctrl)
 552		kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
 553}
 554
 555
 556/****************************************************************
 557 *     kaweth_resubmit_rx_urb
 558 ****************************************************************/
 559static int kaweth_resubmit_rx_urb(struct kaweth_device *kaweth,
 560						gfp_t mem_flags)
 561{
 562	int result;
 563
 564	usb_fill_bulk_urb(kaweth->rx_urb,
 565		      kaweth->dev,
 566		      usb_rcvbulkpipe(kaweth->dev, 1),
 567		      kaweth->rx_buf,
 568		      KAWETH_BUF_SIZE,
 569		      kaweth_usb_receive,
 570		      kaweth);
 571	kaweth->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 572	kaweth->rx_urb->transfer_dma = kaweth->rxbufferhandle;
 573
 574	if((result = usb_submit_urb(kaweth->rx_urb, mem_flags))) {
 575		if (result == -ENOMEM) {
 576			kaweth->suspend_lowmem_rx = 1;
 577			schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
 578		}
 579		dev_err(&kaweth->intf->dev, "resubmitting rx_urb %d failed\n",
 580			result);
 581	} else {
 582		kaweth->suspend_lowmem_rx = 0;
 583	}
 584
 585	return result;
 586}
 587
 588static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth);
 589
 590/****************************************************************
 591 *     kaweth_usb_receive
 592 ****************************************************************/
 593static void kaweth_usb_receive(struct urb *urb)
 594{
 595	struct device *dev = &urb->dev->dev;
 596	struct kaweth_device *kaweth = urb->context;
 597	struct net_device *net = kaweth->net;
 598	int status = urb->status;
 599
 600	int count = urb->actual_length;
 601	int count2 = urb->transfer_buffer_length;
 602
 603	__u16 pkt_len = le16_to_cpup((__le16 *)kaweth->rx_buf);
 604
 605	struct sk_buff *skb;
 606
 607	if (unlikely(status == -EPIPE)) {
 608		kaweth->stats.rx_errors++;
 609		kaweth->end = 1;
 610		wake_up(&kaweth->term_wait);
 611		dev_dbg(dev, "Status was -EPIPE.\n");
 612		return;
 613	}
 614	if (unlikely(status == -ECONNRESET || status == -ESHUTDOWN)) {
 615		/* we are killed - set a flag and wake the disconnect handler */
 616		kaweth->end = 1;
 617		wake_up(&kaweth->term_wait);
 618		dev_dbg(dev, "Status was -ECONNRESET or -ESHUTDOWN.\n");
 619		return;
 620	}
 621	if (unlikely(status == -EPROTO || status == -ETIME ||
 622		     status == -EILSEQ)) {
 623		kaweth->stats.rx_errors++;
 624		dev_dbg(dev, "Status was -EPROTO, -ETIME, or -EILSEQ.\n");
 625		return;
 626	}
 627	if (unlikely(status == -EOVERFLOW)) {
 628		kaweth->stats.rx_errors++;
 629		dev_dbg(dev, "Status was -EOVERFLOW.\n");
 630	}
 631	spin_lock(&kaweth->device_lock);
 632	if (IS_BLOCKED(kaweth->status)) {
 633		spin_unlock(&kaweth->device_lock);
 634		return;
 635	}
 636	spin_unlock(&kaweth->device_lock);
 637
 638	if(status && status != -EREMOTEIO && count != 1) {
 639		dev_err(&kaweth->intf->dev,
 640			"%s RX status: %d count: %d packet_len: %d\n",
 641			net->name, status, count, (int)pkt_len);
 642		kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 643                return;
 644	}
 645
 646	if(kaweth->net && (count > 2)) {
 647		if(pkt_len > (count - 2)) {
 648			dev_err(&kaweth->intf->dev,
 649				"Packet length too long for USB frame (pkt_len: %x, count: %x)\n",
 650				pkt_len, count);
 651			dev_err(&kaweth->intf->dev, "Packet len & 2047: %x\n",
 652				pkt_len & 2047);
 653			dev_err(&kaweth->intf->dev, "Count 2: %x\n", count2);
 654		        kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 655                        return;
 656                }
 657
 658		if(!(skb = dev_alloc_skb(pkt_len+2))) {
 659		        kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 660                        return;
 661		}
 662
 663		skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
 664
 665		skb_copy_to_linear_data(skb, kaweth->rx_buf + 2, pkt_len);
 666
 667		skb_put(skb, pkt_len);
 668
 669		skb->protocol = eth_type_trans(skb, net);
 670
 671		netif_rx(skb);
 672
 673		kaweth->stats.rx_packets++;
 674		kaweth->stats.rx_bytes += pkt_len;
 675	}
 676
 677	kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 678}
 679
 680/****************************************************************
 681 *     kaweth_open
 682 ****************************************************************/
 683static int kaweth_open(struct net_device *net)
 684{
 685	struct kaweth_device *kaweth = netdev_priv(net);
 686	int res;
 687
 688	netdev_dbg(kaweth->net, "Opening network device.\n");
 689
 690	res = usb_autopm_get_interface(kaweth->intf);
 691	if (res) {
 692		dev_err(&kaweth->intf->dev, "Interface cannot be resumed.\n");
 693		return -EIO;
 694	}
 695	res = kaweth_resubmit_rx_urb(kaweth, GFP_KERNEL);
 696	if (res)
 697		goto err_out;
 698
 699	usb_fill_int_urb(
 700		kaweth->irq_urb,
 701		kaweth->dev,
 702		usb_rcvintpipe(kaweth->dev, 3),
 703		kaweth->intbuffer,
 704		INTBUFFERSIZE,
 705		int_callback,
 706		kaweth,
 707		250); /* overriding the descriptor */
 708	kaweth->irq_urb->transfer_dma = kaweth->intbufferhandle;
 709	kaweth->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 710
 711	res = usb_submit_urb(kaweth->irq_urb, GFP_KERNEL);
 712	if (res) {
 713		usb_kill_urb(kaweth->rx_urb);
 714		goto err_out;
 715	}
 716	kaweth->opened = 1;
 717
 718	netif_start_queue(net);
 719
 720	kaweth_async_set_rx_mode(kaweth);
 721	return 0;
 722
 723err_out:
 724	usb_autopm_put_interface(kaweth->intf);
 725	return -EIO;
 726}
 727
 728/****************************************************************
 729 *     kaweth_kill_urbs
 730 ****************************************************************/
 731static void kaweth_kill_urbs(struct kaweth_device *kaweth)
 732{
 733	usb_kill_urb(kaweth->irq_urb);
 734	usb_kill_urb(kaweth->rx_urb);
 735	usb_kill_urb(kaweth->tx_urb);
 736
 737	cancel_delayed_work_sync(&kaweth->lowmem_work);
 738
 739	/* a scheduled work may have resubmitted,
 740	   we hit them again */
 741	usb_kill_urb(kaweth->irq_urb);
 742	usb_kill_urb(kaweth->rx_urb);
 743}
 744
 745/****************************************************************
 746 *     kaweth_close
 747 ****************************************************************/
 748static int kaweth_close(struct net_device *net)
 749{
 750	struct kaweth_device *kaweth = netdev_priv(net);
 751
 752	netif_stop_queue(net);
 753	kaweth->opened = 0;
 754
 755	kaweth->status |= KAWETH_STATUS_CLOSING;
 756
 757	kaweth_kill_urbs(kaweth);
 758
 759	kaweth->status &= ~KAWETH_STATUS_CLOSING;
 760
 761	usb_autopm_put_interface(kaweth->intf);
 762
 763	return 0;
 764}
 765
 766static u32 kaweth_get_link(struct net_device *dev)
 767{
 768	struct kaweth_device *kaweth = netdev_priv(dev);
 769
 770	return kaweth->linkstate;
 771}
 772
 773static const struct ethtool_ops ops = {
 774	.get_link	= kaweth_get_link
 775};
 776
 777/****************************************************************
 778 *     kaweth_usb_transmit_complete
 779 ****************************************************************/
 780static void kaweth_usb_transmit_complete(struct urb *urb)
 781{
 782	struct kaweth_device *kaweth = urb->context;
 783	struct sk_buff *skb = kaweth->tx_skb;
 784	int status = urb->status;
 785
 786	if (unlikely(status != 0))
 787		if (status != -ENOENT)
 788			dev_dbg(&urb->dev->dev, "%s: TX status %d.\n",
 789				kaweth->net->name, status);
 790
 791	netif_wake_queue(kaweth->net);
 792	dev_kfree_skb_irq(skb);
 793}
 794
 795/****************************************************************
 796 *     kaweth_start_xmit
 797 ****************************************************************/
 798static netdev_tx_t kaweth_start_xmit(struct sk_buff *skb,
 799					   struct net_device *net)
 800{
 801	struct kaweth_device *kaweth = netdev_priv(net);
 802	__le16 *private_header;
 803
 804	int res;
 805
 806	spin_lock_irq(&kaweth->device_lock);
 807
 808	kaweth_async_set_rx_mode(kaweth);
 809	netif_stop_queue(net);
 810	if (IS_BLOCKED(kaweth->status)) {
 811		goto skip;
 812	}
 813
 814	/* We now decide whether we can put our special header into the sk_buff */
 815	if (skb_cloned(skb) || skb_headroom(skb) < 2) {
 816		/* no such luck - we make our own */
 817		struct sk_buff *copied_skb;
 818		copied_skb = skb_copy_expand(skb, 2, 0, GFP_ATOMIC);
 819		dev_kfree_skb_irq(skb);
 820		skb = copied_skb;
 821		if (!copied_skb) {
 822			kaweth->stats.tx_errors++;
 823			netif_start_queue(net);
 824			spin_unlock_irq(&kaweth->device_lock);
 825			return NETDEV_TX_OK;
 826		}
 827	}
 828
 829	private_header = (__le16 *)__skb_push(skb, 2);
 830	*private_header = cpu_to_le16(skb->len-2);
 831	kaweth->tx_skb = skb;
 832
 833	usb_fill_bulk_urb(kaweth->tx_urb,
 834		      kaweth->dev,
 835		      usb_sndbulkpipe(kaweth->dev, 2),
 836		      private_header,
 837		      skb->len,
 838		      kaweth_usb_transmit_complete,
 839		      kaweth);
 840	kaweth->end = 0;
 841
 842	if((res = usb_submit_urb(kaweth->tx_urb, GFP_ATOMIC)))
 843	{
 844		dev_warn(&net->dev, "kaweth failed tx_urb %d\n", res);
 845skip:
 846		kaweth->stats.tx_errors++;
 847
 848		netif_start_queue(net);
 849		dev_kfree_skb_irq(skb);
 850	}
 851	else
 852	{
 853		kaweth->stats.tx_packets++;
 854		kaweth->stats.tx_bytes += skb->len;
 855	}
 856
 857	spin_unlock_irq(&kaweth->device_lock);
 858
 859	return NETDEV_TX_OK;
 860}
 861
 862/****************************************************************
 863 *     kaweth_set_rx_mode
 864 ****************************************************************/
 865static void kaweth_set_rx_mode(struct net_device *net)
 866{
 867	struct kaweth_device *kaweth = netdev_priv(net);
 868
 869	__u16 packet_filter_bitmap = KAWETH_PACKET_FILTER_DIRECTED |
 870                                     KAWETH_PACKET_FILTER_BROADCAST |
 871		                     KAWETH_PACKET_FILTER_MULTICAST;
 872
 873	netdev_dbg(net, "Setting Rx mode to %d\n", packet_filter_bitmap);
 874
 875	netif_stop_queue(net);
 876
 877	if (net->flags & IFF_PROMISC) {
 878		packet_filter_bitmap |= KAWETH_PACKET_FILTER_PROMISCUOUS;
 879	}
 880	else if (!netdev_mc_empty(net) || (net->flags & IFF_ALLMULTI)) {
 881		packet_filter_bitmap |= KAWETH_PACKET_FILTER_ALL_MULTICAST;
 882	}
 883
 884	kaweth->packet_filter_bitmap = packet_filter_bitmap;
 885	netif_wake_queue(net);
 886}
 887
 888/****************************************************************
 889 *     kaweth_async_set_rx_mode
 890 ****************************************************************/
 891static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth)
 892{
 893	int result;
 894	__u16 packet_filter_bitmap = kaweth->packet_filter_bitmap;
 895
 896	kaweth->packet_filter_bitmap = 0;
 897	if (packet_filter_bitmap == 0)
 898		return;
 899
 900	if (in_interrupt())
 901		return;
 902
 903	result = kaweth_control(kaweth,
 904				usb_sndctrlpipe(kaweth->dev, 0),
 905				KAWETH_COMMAND_SET_PACKET_FILTER,
 906				USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 907				packet_filter_bitmap,
 908				0,
 909				(void *)&kaweth->scratch,
 910				0,
 911				KAWETH_CONTROL_TIMEOUT);
 912
 913	if(result < 0) {
 914		dev_err(&kaweth->intf->dev, "Failed to set Rx mode: %d\n",
 915			result);
 916	}
 917	else {
 918		netdev_dbg(kaweth->net, "Set Rx mode to %d\n",
 919			   packet_filter_bitmap);
 920	}
 921}
 922
 923/****************************************************************
 924 *     kaweth_netdev_stats
 925 ****************************************************************/
 926static struct net_device_stats *kaweth_netdev_stats(struct net_device *dev)
 927{
 928	struct kaweth_device *kaweth = netdev_priv(dev);
 929	return &kaweth->stats;
 930}
 931
 932/****************************************************************
 933 *     kaweth_tx_timeout
 934 ****************************************************************/
 935static void kaweth_tx_timeout(struct net_device *net)
 936{
 937	struct kaweth_device *kaweth = netdev_priv(net);
 938
 939	dev_warn(&net->dev, "%s: Tx timed out. Resetting.\n", net->name);
 940	kaweth->stats.tx_errors++;
 941	net->trans_start = jiffies;
 942
 943	usb_unlink_urb(kaweth->tx_urb);
 944}
 945
 946/****************************************************************
 947 *     kaweth_suspend
 948 ****************************************************************/
 949static int kaweth_suspend(struct usb_interface *intf, pm_message_t message)
 950{
 951	struct kaweth_device *kaweth = usb_get_intfdata(intf);
 952	unsigned long flags;
 953
 954	dev_dbg(&intf->dev, "Suspending device\n");
 955	spin_lock_irqsave(&kaweth->device_lock, flags);
 956	kaweth->status |= KAWETH_STATUS_SUSPENDING;
 957	spin_unlock_irqrestore(&kaweth->device_lock, flags);
 958
 959	kaweth_kill_urbs(kaweth);
 960	return 0;
 961}
 962
 963/****************************************************************
 964 *     kaweth_resume
 965 ****************************************************************/
 966static int kaweth_resume(struct usb_interface *intf)
 967{
 968	struct kaweth_device *kaweth = usb_get_intfdata(intf);
 969	unsigned long flags;
 970
 971	dev_dbg(&intf->dev, "Resuming device\n");
 972	spin_lock_irqsave(&kaweth->device_lock, flags);
 973	kaweth->status &= ~KAWETH_STATUS_SUSPENDING;
 974	spin_unlock_irqrestore(&kaweth->device_lock, flags);
 975
 976	if (!kaweth->opened)
 977		return 0;
 978	kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
 979	kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
 980
 981	return 0;
 982}
 983
 984/****************************************************************
 985 *     kaweth_probe
 986 ****************************************************************/
 987
 988
 989static const struct net_device_ops kaweth_netdev_ops = {
 990	.ndo_open =			kaweth_open,
 991	.ndo_stop =			kaweth_close,
 992	.ndo_start_xmit =		kaweth_start_xmit,
 993	.ndo_tx_timeout =		kaweth_tx_timeout,
 994	.ndo_set_rx_mode =		kaweth_set_rx_mode,
 995	.ndo_get_stats =		kaweth_netdev_stats,
 996	.ndo_change_mtu =		eth_change_mtu,
 997	.ndo_set_mac_address =		eth_mac_addr,
 998	.ndo_validate_addr =		eth_validate_addr,
 999};
1000
1001static int kaweth_probe(
1002		struct usb_interface *intf,
1003		const struct usb_device_id *id      /* from id_table */
1004	)
1005{
1006	struct device *dev = &intf->dev;
1007	struct usb_device *udev = interface_to_usbdev(intf);
1008	struct kaweth_device *kaweth;
1009	struct net_device *netdev;
1010	const eth_addr_t bcast_addr = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
1011	int result = 0;
1012
1013	dev_dbg(dev,
1014		"Kawasaki Device Probe (Device number:%d): 0x%4.4x:0x%4.4x:0x%4.4x\n",
1015		udev->devnum, le16_to_cpu(udev->descriptor.idVendor),
1016		le16_to_cpu(udev->descriptor.idProduct),
1017		le16_to_cpu(udev->descriptor.bcdDevice));
1018
1019	dev_dbg(dev, "Device at %p\n", udev);
1020
1021	dev_dbg(dev, "Descriptor length: %x type: %x\n",
1022		(int)udev->descriptor.bLength,
1023		(int)udev->descriptor.bDescriptorType);
1024
1025	netdev = alloc_etherdev(sizeof(*kaweth));
1026	if (!netdev)
1027		return -ENOMEM;
1028
1029	kaweth = netdev_priv(netdev);
1030	kaweth->dev = udev;
1031	kaweth->net = netdev;
1032
1033	spin_lock_init(&kaweth->device_lock);
1034	init_waitqueue_head(&kaweth->term_wait);
1035
1036	dev_dbg(dev, "Resetting.\n");
1037
1038	kaweth_reset(kaweth);
1039
1040	/*
1041	 * If high byte of bcdDevice is nonzero, firmware is already
1042	 * downloaded. Don't try to do it again, or we'll hang the device.
1043	 */
1044
1045	if (le16_to_cpu(udev->descriptor.bcdDevice) >> 8) {
1046		dev_info(dev, "Firmware present in device.\n");
1047	} else {
1048		/* Download the firmware */
1049		dev_info(dev, "Downloading firmware...\n");
1050		kaweth->firmware_buf = (__u8 *)__get_free_page(GFP_KERNEL);
1051		if ((result = kaweth_download_firmware(kaweth,
1052						      "kaweth/new_code.bin",
1053						      100,
1054						      2)) < 0) {
1055			dev_err(dev, "Error downloading firmware (%d)\n",
1056				result);
1057			goto err_fw;
1058		}
1059
1060		if ((result = kaweth_download_firmware(kaweth,
1061						      "kaweth/new_code_fix.bin",
1062						      100,
1063						      3)) < 0) {
1064			dev_err(dev, "Error downloading firmware fix (%d)\n",
1065				result);
1066			goto err_fw;
1067		}
1068
1069		if ((result = kaweth_download_firmware(kaweth,
1070						      "kaweth/trigger_code.bin",
1071						      126,
1072						      2)) < 0) {
1073			dev_err(dev, "Error downloading trigger code (%d)\n",
1074				result);
1075			goto err_fw;
1076
1077		}
1078
1079		if ((result = kaweth_download_firmware(kaweth,
1080						      "kaweth/trigger_code_fix.bin",
1081						      126,
1082						      3)) < 0) {
1083			dev_err(dev, "Error downloading trigger code fix (%d)\n", result);
1084			goto err_fw;
1085		}
1086
1087
1088		if ((result = kaweth_trigger_firmware(kaweth, 126)) < 0) {
1089			dev_err(dev, "Error triggering firmware (%d)\n", result);
1090			goto err_fw;
1091		}
1092
1093		/* Device will now disappear for a moment...  */
1094		dev_info(dev, "Firmware loaded.  I'll be back...\n");
1095err_fw:
1096		free_page((unsigned long)kaweth->firmware_buf);
1097		free_netdev(netdev);
1098		return -EIO;
1099	}
1100
1101	result = kaweth_read_configuration(kaweth);
1102
1103	if(result < 0) {
1104		dev_err(dev, "Error reading configuration (%d), no net device created\n", result);
1105		goto err_free_netdev;
1106	}
1107
1108	dev_info(dev, "Statistics collection: %x\n", kaweth->configuration.statistics_mask);
1109	dev_info(dev, "Multicast filter limit: %x\n", kaweth->configuration.max_multicast_filters & ((1 << 15) - 1));
1110	dev_info(dev, "MTU: %d\n", le16_to_cpu(kaweth->configuration.segment_size));
1111	dev_info(dev, "Read MAC address %pM\n", kaweth->configuration.hw_addr);
1112
1113	if(!memcmp(&kaweth->configuration.hw_addr,
1114                   &bcast_addr,
1115		   sizeof(bcast_addr))) {
1116		dev_err(dev, "Firmware not functioning properly, no net device created\n");
1117		goto err_free_netdev;
1118	}
1119
1120	if(kaweth_set_urb_size(kaweth, KAWETH_BUF_SIZE) < 0) {
1121		dev_dbg(dev, "Error setting URB size\n");
1122		goto err_free_netdev;
1123	}
1124
1125	if(kaweth_set_sofs_wait(kaweth, KAWETH_SOFS_TO_WAIT) < 0) {
1126		dev_err(dev, "Error setting SOFS wait\n");
1127		goto err_free_netdev;
1128	}
1129
1130	result = kaweth_set_receive_filter(kaweth,
1131                                           KAWETH_PACKET_FILTER_DIRECTED |
1132                                           KAWETH_PACKET_FILTER_BROADCAST |
1133                                           KAWETH_PACKET_FILTER_MULTICAST);
1134
1135	if(result < 0) {
1136		dev_err(dev, "Error setting receive filter\n");
1137		goto err_free_netdev;
1138	}
1139
1140	dev_dbg(dev, "Initializing net device.\n");
1141
1142	kaweth->intf = intf;
1143
1144	kaweth->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
1145	if (!kaweth->tx_urb)
1146		goto err_free_netdev;
1147	kaweth->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
1148	if (!kaweth->rx_urb)
1149		goto err_only_tx;
1150	kaweth->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
1151	if (!kaweth->irq_urb)
1152		goto err_tx_and_rx;
1153
1154	kaweth->intbuffer = usb_alloc_coherent(	kaweth->dev,
1155						INTBUFFERSIZE,
1156						GFP_KERNEL,
1157						&kaweth->intbufferhandle);
1158	if (!kaweth->intbuffer)
1159		goto err_tx_and_rx_and_irq;
1160	kaweth->rx_buf = usb_alloc_coherent(	kaweth->dev,
1161						KAWETH_BUF_SIZE,
1162						GFP_KERNEL,
1163						&kaweth->rxbufferhandle);
1164	if (!kaweth->rx_buf)
1165		goto err_all_but_rxbuf;
1166
1167	memcpy(netdev->broadcast, &bcast_addr, sizeof(bcast_addr));
1168	memcpy(netdev->dev_addr, &kaweth->configuration.hw_addr,
1169               sizeof(kaweth->configuration.hw_addr));
1170
1171	netdev->netdev_ops = &kaweth_netdev_ops;
1172	netdev->watchdog_timeo = KAWETH_TX_TIMEOUT;
1173	netdev->mtu = le16_to_cpu(kaweth->configuration.segment_size);
1174	SET_ETHTOOL_OPS(netdev, &ops);
1175
1176	/* kaweth is zeroed as part of alloc_netdev */
1177	INIT_DELAYED_WORK(&kaweth->lowmem_work, kaweth_resubmit_tl);
1178	usb_set_intfdata(intf, kaweth);
1179
1180#if 0
1181// dma_supported() is deeply broken on almost all architectures
1182	if (dma_supported (dev, 0xffffffffffffffffULL))
1183		kaweth->net->features |= NETIF_F_HIGHDMA;
1184#endif
1185
1186	SET_NETDEV_DEV(netdev, dev);
1187	if (register_netdev(netdev) != 0) {
1188		dev_err(dev, "Error registering netdev.\n");
1189		goto err_intfdata;
1190	}
1191
1192	dev_info(dev, "kaweth interface created at %s\n",
1193		 kaweth->net->name);
1194
1195	dev_dbg(dev, "Kaweth probe returning.\n");
1196
1197	return 0;
1198
1199err_intfdata:
1200	usb_set_intfdata(intf, NULL);
1201	usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1202err_all_but_rxbuf:
1203	usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1204err_tx_and_rx_and_irq:
1205	usb_free_urb(kaweth->irq_urb);
1206err_tx_and_rx:
1207	usb_free_urb(kaweth->rx_urb);
1208err_only_tx:
1209	usb_free_urb(kaweth->tx_urb);
1210err_free_netdev:
1211	free_netdev(netdev);
1212
1213	return -EIO;
1214}
1215
1216/****************************************************************
1217 *     kaweth_disconnect
1218 ****************************************************************/
1219static void kaweth_disconnect(struct usb_interface *intf)
1220{
1221	struct kaweth_device *kaweth = usb_get_intfdata(intf);
1222	struct net_device *netdev;
1223
1224	dev_info(&intf->dev, "Unregistering\n");
1225
1226	usb_set_intfdata(intf, NULL);
1227	if (!kaweth) {
1228		dev_warn(&intf->dev, "unregistering non-existent device\n");
1229		return;
1230	}
1231	netdev = kaweth->net;
1232
1233	netdev_dbg(kaweth->net, "Unregistering net device\n");
1234	unregister_netdev(netdev);
1235
1236	usb_free_urb(kaweth->rx_urb);
1237	usb_free_urb(kaweth->tx_urb);
1238	usb_free_urb(kaweth->irq_urb);
1239
1240	usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1241	usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1242
1243	free_netdev(netdev);
1244}
1245
1246
1247// FIXME this completion stuff is a modified clone of
1248// an OLD version of some stuff in usb.c ...
1249struct usb_api_data {
1250	wait_queue_head_t wqh;
1251	int done;
1252};
1253
1254/*-------------------------------------------------------------------*
1255 * completion handler for compatibility wrappers (sync control/bulk) *
1256 *-------------------------------------------------------------------*/
1257static void usb_api_blocking_completion(struct urb *urb)
1258{
1259        struct usb_api_data *awd = (struct usb_api_data *)urb->context;
1260
1261	awd->done=1;
1262	wake_up(&awd->wqh);
1263}
1264
1265/*-------------------------------------------------------------------*
1266 *                         COMPATIBILITY STUFF                       *
1267 *-------------------------------------------------------------------*/
1268
1269// Starts urb and waits for completion or timeout
1270static int usb_start_wait_urb(struct urb *urb, int timeout, int* actual_length)
1271{
1272	struct usb_api_data awd;
1273        int status;
1274
1275        init_waitqueue_head(&awd.wqh);
1276        awd.done = 0;
1277
1278        urb->context = &awd;
1279        status = usb_submit_urb(urb, GFP_NOIO);
1280        if (status) {
1281                // something went wrong
1282                usb_free_urb(urb);
1283                return status;
1284        }
1285
1286	if (!wait_event_timeout(awd.wqh, awd.done, timeout)) {
1287                // timeout
1288                dev_warn(&urb->dev->dev, "usb_control/bulk_msg: timeout\n");
1289                usb_kill_urb(urb);  // remove urb safely
1290                status = -ETIMEDOUT;
1291        }
1292	else {
1293                status = urb->status;
1294	}
1295
1296        if (actual_length) {
1297                *actual_length = urb->actual_length;
1298	}
1299
1300        usb_free_urb(urb);
1301        return status;
1302}
1303
1304/*-------------------------------------------------------------------*/
1305// returns status (negative) or length (positive)
1306static int kaweth_internal_control_msg(struct usb_device *usb_dev,
1307				       unsigned int pipe,
1308				       struct usb_ctrlrequest *cmd, void *data,
1309				       int len, int timeout)
1310{
1311        struct urb *urb;
1312        int retv;
1313        int length = 0; /* shut up GCC */
1314
1315	urb = usb_alloc_urb(0, GFP_ATOMIC);
1316        if (!urb)
1317                return -ENOMEM;
1318
1319        usb_fill_control_urb(urb, usb_dev, pipe, (unsigned char*)cmd, data,
1320			 len, usb_api_blocking_completion, NULL);
1321
1322        retv = usb_start_wait_urb(urb, timeout, &length);
1323        if (retv < 0) {
1324                return retv;
1325	}
1326        else {
1327                return length;
1328	}
1329}
1330
1331module_usb_driver(kaweth_driver);