aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/usb/net/zd1201.c
blob: 3b387b005739150dc0de494f726a917b2d2981d0 (plain) (tree)
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742














































                                                                             
                                                             



























































                                                                                                                                                                                                                                                                                        
                   



                                   
                                                                 





























                                                                        

                                                              































                                                                                
                                                               





                                         
                   
                                                               












































































































































































































































































































































































































































                                                                                                                                 
                                               




























































































































































                                                                            
                                                                   




































































































































































































































































































































                                                                               
                                                                     








                                                                        
                                                                           






















































































































































































































































































































































































































































































































































































































































                                                                                          

                                                        














































































































                                                                               
                                                              





























                                                                            




















                                                          


                               














                                         
                                       




                                        

                                  













                                         
/*
 *	Driver for ZyDAS zd1201 based wireless USB devices.
 *
 *	Copyright (c) 2004, 2005 Jeroen Vreeken (pe1rxq@amsat.org)
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	version 2 as published by the Free Software Foundation.
 *
 *	Parts of this driver have been derived from a wlan-ng version
 *	modified by ZyDAS. They also made documentation available, thanks!
 *	Copyright (C) 1999 AbsoluteValue Systems, Inc.  All Rights Reserved.
 */

#include <linux/module.h>
#include <linux/usb.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/wireless.h>
#include <net/iw_handler.h>
#include <linux/string.h>
#include <linux/if_arp.h>
#include <linux/firmware.h>
#include <ieee802_11.h>
#include "zd1201.h"

static struct usb_device_id zd1201_table[] = {
	{USB_DEVICE(0x0586, 0x3400)}, /* Peabird Wireless USB Adapter */
	{USB_DEVICE(0x0ace, 0x1201)}, /* ZyDAS ZD1201 Wireless USB Adapter */
	{USB_DEVICE(0x050d, 0x6051)}, /* Belkin F5D6051 usb  adapter */
	{USB_DEVICE(0x0db0, 0x6823)}, /* MSI UB11B usb  adapter */
	{}
};

static int ap = 0;	/* Are we an AP or a normal station? */

#define ZD1201_VERSION	"0.15"

MODULE_AUTHOR("Jeroen Vreeken <pe1rxq@amsat.org>");
MODULE_DESCRIPTION("Driver for ZyDAS ZD1201 based USB Wireless adapters");
MODULE_VERSION(ZD1201_VERSION);
MODULE_LICENSE("GPL");
module_param(ap, int, 0);
MODULE_PARM_DESC(ap, "If non-zero Access Point firmware will be loaded");
MODULE_DEVICE_TABLE(usb, zd1201_table);


static int zd1201_fw_upload(struct usb_device *dev, int apfw)
{
	const struct firmware *fw_entry;
	char* data;
	unsigned long len;
	int err;
	unsigned char ret;
	char *buf;
	char *fwfile;

	if (apfw)
		fwfile = "zd1201-ap.fw";
	else
		fwfile = "zd1201.fw";

	err = request_firmware(&fw_entry, fwfile, &dev->dev);
	if (err) {
		dev_err(&dev->dev, "Failed to load %s firmware file!\n", fwfile);
		dev_err(&dev->dev, "Make sure the hotplug firmware loader is installed.\n");
		dev_err(&dev->dev, "Goto http://linux-lc100020.sourceforge.net for more info\n");
		return err;
	}

	data = fw_entry->data;
        len = fw_entry->size;

	buf = kmalloc(1024, GFP_ATOMIC);
	if (!buf)
		goto exit;
	
	while (len > 0) {
		int translen = (len > 1024) ? 1024 : len;
		memcpy(buf, data, translen);

		err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 0,
		    USB_DIR_OUT | 0x40, 0, 0, buf, translen,
		    ZD1201_FW_TIMEOUT);
		if (err < 0)
			goto exit;

		len -= translen;
		data += translen;
	}
                                        
	err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 0x2,
	    USB_DIR_OUT | 0x40, 0, 0, NULL, 0, ZD1201_FW_TIMEOUT);
	if (err < 0)
		goto exit;
                                                                                                                                                                
	err = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 0x4,
	    USB_DIR_IN | 0x40, 0,0, &ret, sizeof(ret), ZD1201_FW_TIMEOUT);
	if (err < 0)
		goto exit;
                                                                                                                                                                                                                                                                                        
	if (ret & 0x80) {
		err = -EIO;
		goto exit;
	}

	err = 0;
exit:
	kfree(buf);
	release_firmware(fw_entry);
	return err;
}

static void zd1201_usbfree(struct urb *urb, struct pt_regs *regs)
{
	struct zd1201 *zd = urb->context;

	switch(urb->status) {
		case -EILSEQ:
		case -ENODEV:
		case -ETIMEDOUT:
		case -ENOENT:
		case -EPIPE:
		case -EOVERFLOW:
		case -ESHUTDOWN:
			dev_warn(&zd->usb->dev, "%s: urb failed: %d\n", 
			    zd->dev->name, urb->status);
	}

	kfree(urb->transfer_buffer);
	usb_free_urb(urb);
	return;
}

/* cmdreq message: 
	u32 type
	u16 cmd
	u16 parm0
	u16 parm1
	u16 parm2
	u8  pad[4]

	total: 4 + 2 + 2 + 2 + 2 + 4 = 16
*/
static int zd1201_docmd(struct zd1201 *zd, int cmd, int parm0,
			int parm1, int parm2)
{
	unsigned char *command;
	int ret;
	struct urb *urb;

	command = kmalloc(16, GFP_ATOMIC);
	if (!command)
		return -ENOMEM;

	*((__le32*)command) = cpu_to_le32(ZD1201_USB_CMDREQ);
	*((__le16*)&command[4]) = cpu_to_le16(cmd);
	*((__le16*)&command[6]) = cpu_to_le16(parm0);
	*((__le16*)&command[8]) = cpu_to_le16(parm1);
	*((__le16*)&command[10])= cpu_to_le16(parm2);

	urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!urb) {
		kfree(command);
		return -ENOMEM;
	}
	usb_fill_bulk_urb(urb, zd->usb, usb_sndbulkpipe(zd->usb, zd->endp_out2),
	     command, 16, zd1201_usbfree, zd);
	ret = usb_submit_urb(urb, GFP_ATOMIC);
	if (ret) {
		kfree(command);
		usb_free_urb(urb);
	}
	
	return ret;
}

/* Callback after sending out a packet */
static void zd1201_usbtx(struct urb *urb, struct pt_regs *regs)
{
	struct zd1201 *zd = urb->context;
	netif_wake_queue(zd->dev);
	return;
}

/* Incoming data */
static void zd1201_usbrx(struct urb *urb, struct pt_regs *regs)
{
	struct zd1201 *zd = urb->context;
	int free = 0;
	unsigned char *data = urb->transfer_buffer;
	struct sk_buff *skb;
	unsigned char type;

	if (!zd) {
		free = 1;
		goto exit;
	}

	switch(urb->status) {
		case -EILSEQ:
		case -ENODEV:
		case -ETIMEDOUT:
		case -ENOENT:
		case -EPIPE:
		case -EOVERFLOW:
		case -ESHUTDOWN:
			dev_warn(&zd->usb->dev, "%s: rx urb failed: %d\n",
			    zd->dev->name, urb->status);
			free = 1;
			goto exit;
	}
	
	if (urb->status != 0 || urb->actual_length == 0)
		goto resubmit;

	type = data[0];
	if (type == ZD1201_PACKET_EVENTSTAT || type == ZD1201_PACKET_RESOURCE) {
		memcpy(zd->rxdata, data, urb->actual_length);
		zd->rxlen = urb->actual_length;
		zd->rxdatas = 1;
		wake_up(&zd->rxdataq);
	}
	/* Info frame */
	if (type == ZD1201_PACKET_INQUIRE) {
		int i = 0;
		unsigned short infotype, framelen, copylen;
		framelen = le16_to_cpu(*(__le16*)&data[4]);
		infotype = le16_to_cpu(*(__le16*)&data[6]);

		if (infotype == ZD1201_INF_LINKSTATUS) {
			short linkstatus;

			linkstatus = le16_to_cpu(*(__le16*)&data[8]);
			switch(linkstatus) {
				case 1:
					netif_carrier_on(zd->dev);
					break;
				case 2:
					netif_carrier_off(zd->dev);
					break;
				case 3:
					netif_carrier_off(zd->dev);
					break;
				case 4:
					netif_carrier_on(zd->dev);
					break;
				default:
					netif_carrier_off(zd->dev);
			}
			goto resubmit;
		}
		if (infotype == ZD1201_INF_ASSOCSTATUS) {
			short status = le16_to_cpu(*(__le16*)(data+8));
			int event;
			union iwreq_data wrqu;

			switch (status) {
				case ZD1201_ASSOCSTATUS_STAASSOC:
				case ZD1201_ASSOCSTATUS_REASSOC:
					event = IWEVREGISTERED;
					break;
				case ZD1201_ASSOCSTATUS_DISASSOC:
				case ZD1201_ASSOCSTATUS_ASSOCFAIL:
				case ZD1201_ASSOCSTATUS_AUTHFAIL:
				default:
					event = IWEVEXPIRED;
			}
			memcpy(wrqu.addr.sa_data, data+10, ETH_ALEN);
			wrqu.addr.sa_family = ARPHRD_ETHER;

			/* Send event to user space */
			wireless_send_event(zd->dev, event, &wrqu, NULL);

			goto resubmit;
		}
		if (infotype == ZD1201_INF_AUTHREQ) {
			union iwreq_data wrqu;

			memcpy(wrqu.addr.sa_data, data+8, ETH_ALEN);
			wrqu.addr.sa_family = ARPHRD_ETHER;
			/* There isn't a event that trully fits this request.
			   We assume that userspace will be smart enough to
			   see a new station being expired and sends back a
			   authstation ioctl to authorize it. */
			wireless_send_event(zd->dev, IWEVEXPIRED, &wrqu, NULL);
			goto resubmit;
		}
		/* Other infotypes are handled outside this handler */
		zd->rxlen = 0;
		while (i < urb->actual_length) {
			copylen = le16_to_cpu(*(__le16*)&data[i+2]);
			/* Sanity check, sometimes we get junk */
			if (copylen+zd->rxlen > sizeof(zd->rxdata))
				break;
			memcpy(zd->rxdata+zd->rxlen, data+i+4, copylen);
			zd->rxlen += copylen;
			i += 64;
		}
		if (i >= urb->actual_length) {
			zd->rxdatas = 1;
			wake_up(&zd->rxdataq);
		}
		goto  resubmit;
	}
	/* Actual data */
	if (data[urb->actual_length-1] == ZD1201_PACKET_RXDATA) {
		int datalen = urb->actual_length-1;
		unsigned short len, fc, seq;
		struct hlist_node *node;

		len = ntohs(*(__be16 *)&data[datalen-2]);
		if (len>datalen)
			len=datalen;
		fc = le16_to_cpu(*(__le16 *)&data[datalen-16]);
		seq = le16_to_cpu(*(__le16 *)&data[datalen-24]);

		if(zd->monitor) {
			if (datalen < 24)
				goto resubmit;
			if (!(skb = dev_alloc_skb(datalen+24)))
				goto resubmit;
			
			memcpy(skb_put(skb, 2), &data[datalen-16], 2);
			memcpy(skb_put(skb, 2), &data[datalen-2], 2);
			memcpy(skb_put(skb, 6), &data[datalen-14], 6);
			memcpy(skb_put(skb, 6), &data[datalen-22], 6);
			memcpy(skb_put(skb, 6), &data[datalen-8], 6);
			memcpy(skb_put(skb, 2), &data[datalen-24], 2);
			memcpy(skb_put(skb, len), data, len);
			skb->dev = zd->dev;
			skb->dev->last_rx = jiffies;
			skb->protocol = eth_type_trans(skb, zd->dev);
			zd->stats.rx_packets++;
			zd->stats.rx_bytes += skb->len;
			netif_rx(skb);
			goto resubmit;
		}
			
		if ((seq & IEEE802_11_SCTL_FRAG) ||
		    (fc & IEEE802_11_FCTL_MOREFRAGS)) {
			struct zd1201_frag *frag = NULL;
			char *ptr;

			if (datalen<14)
				goto resubmit;
			if ((seq & IEEE802_11_SCTL_FRAG) == 0) {
				frag = kmalloc(sizeof(struct zd1201_frag*),
				    GFP_ATOMIC);
				if (!frag)
					goto resubmit;
				skb = dev_alloc_skb(IEEE802_11_DATA_LEN +14+2);
				if (!skb) {
					kfree(frag);
					goto resubmit;
				}
				frag->skb = skb;
				frag->seq = seq & IEEE802_11_SCTL_SEQ;
				skb_reserve(skb, 2);
				memcpy(skb_put(skb, 12), &data[datalen-14], 12);
				memcpy(skb_put(skb, 2), &data[6], 2);
				memcpy(skb_put(skb, len), data+8, len);
				hlist_add_head(&frag->fnode, &zd->fraglist);
				goto resubmit;
			}
			hlist_for_each_entry(frag, node, &zd->fraglist, fnode)
				if(frag->seq == (seq&IEEE802_11_SCTL_SEQ))
					break;
			if (!frag)
				goto resubmit;
			skb = frag->skb;
			ptr = skb_put(skb, len);
			if (ptr)
				memcpy(ptr, data+8, len);
			if (fc & IEEE802_11_FCTL_MOREFRAGS)
				goto resubmit;
			hlist_del_init(&frag->fnode);
			kfree(frag);
			/* Fallthrough */
		} else {
			if (datalen<14)
				goto resubmit;
			skb = dev_alloc_skb(len + 14 + 2);
			if (!skb)
				goto resubmit;
			skb_reserve(skb, 2);
			memcpy(skb_put(skb, 12), &data[datalen-14], 12);
			memcpy(skb_put(skb, 2), &data[6], 2);
			memcpy(skb_put(skb, len), data+8, len);
		}
		skb->dev = zd->dev;
		skb->dev->last_rx = jiffies;
		skb->protocol = eth_type_trans(skb, zd->dev);
		zd->stats.rx_packets++;
		zd->stats.rx_bytes += skb->len;
		netif_rx(skb);
	}
resubmit:
	memset(data, 0, ZD1201_RXSIZE);

	urb->status = 0;
	urb->dev = zd->usb;
	if(usb_submit_urb(urb, GFP_ATOMIC))
		free = 1;

exit:
	if (free) {
		zd->rxlen = 0;
		zd->rxdatas = 1;
		wake_up(&zd->rxdataq);
		kfree(urb->transfer_buffer);
	}
	return;
}

static int zd1201_getconfig(struct zd1201 *zd, int rid, void *riddata,
	unsigned int riddatalen)
{
	int err;
	int i = 0;
	int code;
	int rid_fid;
	int length;
	unsigned char *pdata;
	
	zd->rxdatas = 0;
	err = zd1201_docmd(zd, ZD1201_CMDCODE_ACCESS, rid, 0, 0);
	if (err)
		return err;

	wait_event_interruptible(zd->rxdataq, zd->rxdatas);
	if (!zd->rxlen)
		return -EIO;

	code = le16_to_cpu(*(__le16*)(&zd->rxdata[4]));
	rid_fid = le16_to_cpu(*(__le16*)(&zd->rxdata[6]));
	length = le16_to_cpu(*(__le16*)(&zd->rxdata[8]));
	if (length > zd->rxlen)
		length = zd->rxlen-6;

	/* If access bit is not on, then error */
	if ((code & ZD1201_ACCESSBIT) != ZD1201_ACCESSBIT || rid_fid != rid )
		return -EINVAL;

	/* Not enough buffer for allocating data */
	if (riddatalen != (length - 4)) {
		dev_dbg(&zd->usb->dev, "riddatalen mismatches, expected=%u, (packet=%u) length=%u, rid=0x%04X, rid_fid=0x%04X\n",
		    riddatalen, zd->rxlen, length, rid, rid_fid);
		return -ENODATA;
	}

	zd->rxdatas = 0;
	/* Issue SetRxRid commnd */			
	err = zd1201_docmd(zd, ZD1201_CMDCODE_SETRXRID, rid, 0, length);
	if (err)
		return err;

	/* Receive RID record from resource packets */
	wait_event_interruptible(zd->rxdataq, zd->rxdatas);
	if (!zd->rxlen)
		return -EIO;

	if (zd->rxdata[zd->rxlen - 1] != ZD1201_PACKET_RESOURCE) {
		dev_dbg(&zd->usb->dev, "Packet type mismatch: 0x%x not 0x3\n",
		    zd->rxdata[zd->rxlen-1]);
		return -EINVAL;
	}

	/* Set the data pointer and received data length */
	pdata = zd->rxdata;
	length = zd->rxlen;

	do {
		int  actual_length;

		actual_length = (length > 64) ? 64 : length;

		if(pdata[0] != 0x3) {
			dev_dbg(&zd->usb->dev, "Rx Resource packet type error: %02X\n",
			    pdata[0]);
			return -EINVAL;
		}

		if (actual_length != 64) {
			/* Trim the last packet type byte */
			actual_length--;
		}

		/* Skip the 4 bytes header (RID length and RID) */
		if(i == 0) {
			pdata += 8;
			actual_length -= 8;
		}
		else {
			pdata += 4;
			actual_length -= 4;
		}
		
		memcpy(riddata, pdata, actual_length);
		riddata += actual_length;
		pdata += actual_length;
		length -= 64;
		i++;
	} while (length > 0);

	return 0;
}

/*
 *	resreq:
 *		byte	type
 *		byte	sequence
 *		u16	reserved
 *		byte	data[12]
 *	total: 16
 */
static int zd1201_setconfig(struct zd1201 *zd, int rid, void *buf, int len, int wait)
{
	int err;
	unsigned char *request;
	int reqlen;
	char seq=0;
	struct urb *urb;
	unsigned int gfp_mask = wait ? GFP_NOIO : GFP_ATOMIC;

	len += 4;			/* first 4 are for header */

	zd->rxdatas = 0;
	zd->rxlen = 0;
	for (seq=0; len > 0; seq++) {
		request = kmalloc(16, gfp_mask);
		if (!request)
			return -ENOMEM;
		urb = usb_alloc_urb(0, gfp_mask);
		if (!urb) {
			kfree(request);
			return -ENOMEM;
		}
		memset(request, 0, 16);
		reqlen = len>12 ? 12 : len;
		request[0] = ZD1201_USB_RESREQ;
		request[1] = seq;
		request[2] = 0;
		request[3] = 0;
		if (request[1] == 0) {
			/* add header */
			*(__le16*)&request[4] = cpu_to_le16((len-2+1)/2);
			*(__le16*)&request[6] = cpu_to_le16(rid);
			memcpy(request+8, buf, reqlen-4);
			buf += reqlen-4;
		} else {
			memcpy(request+4, buf, reqlen);
			buf += reqlen;
		}

		len -= reqlen;

		usb_fill_bulk_urb(urb, zd->usb, usb_sndbulkpipe(zd->usb,
		    zd->endp_out2), request, 16, zd1201_usbfree, zd);
		err = usb_submit_urb(urb, gfp_mask);
		if (err)
			goto err;
	}

	request = kmalloc(16, gfp_mask);
	if (!request)
		return -ENOMEM;
	urb = usb_alloc_urb(0, gfp_mask);
	if (!urb) {
		kfree(request);
		return -ENOMEM;
	}
	*((__le32*)request) = cpu_to_le32(ZD1201_USB_CMDREQ);
	*((__le16*)&request[4]) = 
	    cpu_to_le16(ZD1201_CMDCODE_ACCESS|ZD1201_ACCESSBIT);
	*((__le16*)&request[6]) = cpu_to_le16(rid);
	*((__le16*)&request[8]) = cpu_to_le16(0);
	*((__le16*)&request[10]) = cpu_to_le16(0);
	usb_fill_bulk_urb(urb, zd->usb, usb_sndbulkpipe(zd->usb, zd->endp_out2),
	     request, 16, zd1201_usbfree, zd);
	err = usb_submit_urb(urb, gfp_mask);
	if (err)
		goto err;
	
	if (wait) {
		wait_event_interruptible(zd->rxdataq, zd->rxdatas);
		if (!zd->rxlen || le16_to_cpu(*(__le16*)&zd->rxdata[6]) != rid) {
			dev_dbg(&zd->usb->dev, "wrong or no RID received\n");
		}
	}

	return 0;
err:
	kfree(request);
	usb_free_urb(urb);
	return err;
}

static inline int zd1201_getconfig16(struct zd1201 *zd, int rid, short *val)
{
	int err;
	__le16 zdval;

	err = zd1201_getconfig(zd, rid, &zdval, sizeof(__le16));
	if (err)
		return err;
	*val = le16_to_cpu(zdval);
	return 0;
}

static inline int zd1201_setconfig16(struct zd1201 *zd, int rid, short val)
{
	__le16 zdval = cpu_to_le16(val);
	return (zd1201_setconfig(zd, rid, &zdval, sizeof(__le16), 1));
}

static int zd1201_drvr_start(struct zd1201 *zd)
{
	int err, i;
	short max;
	__le16 zdmax;
	unsigned char *buffer;
	
	buffer = kmalloc(ZD1201_RXSIZE, GFP_KERNEL);
	if (!buffer)
		return -ENOMEM;
	memset(buffer, 0, ZD1201_RXSIZE);

	usb_fill_bulk_urb(zd->rx_urb, zd->usb, 
	    usb_rcvbulkpipe(zd->usb, zd->endp_in), buffer, ZD1201_RXSIZE,
	    zd1201_usbrx, zd);

	err = usb_submit_urb(zd->rx_urb, GFP_KERNEL);
	if (err)
		goto err_buffer;
	
	err = zd1201_docmd(zd, ZD1201_CMDCODE_INIT, 0, 0, 0);
	if (err)
		goto err_urb;

	err = zd1201_getconfig(zd, ZD1201_RID_CNFMAXTXBUFFERNUMBER, &zdmax,
	    sizeof(__le16));
	if (err)
		goto err_urb;

	max = le16_to_cpu(zdmax);
	for (i=0; i<max; i++) {
		err = zd1201_docmd(zd, ZD1201_CMDCODE_ALLOC, 1514, 0, 0);
		if (err)
			goto err_urb;
	}

	return 0;

err_urb:
	usb_kill_urb(zd->rx_urb);
	return err;
err_buffer:
	kfree(buffer);
	return err;
}

/*	Magic alert: The firmware doesn't seem to like the MAC state being
 *	toggled in promisc (aka monitor) mode.
 *	(It works a number of times, but will halt eventually)
 *	So we turn it of before disabling and on after enabling if needed.
 */
static int zd1201_enable(struct zd1201 *zd)
{
	int err;

	if (zd->mac_enabled)
		return 0;

	err = zd1201_docmd(zd, ZD1201_CMDCODE_ENABLE, 0, 0, 0);
	if (!err)
		zd->mac_enabled = 1;

	if (zd->monitor)
		err = zd1201_setconfig16(zd, ZD1201_RID_PROMISCUOUSMODE, 1);

	return err;
}

static int zd1201_disable(struct zd1201 *zd)
{
	int err;
	
	if (!zd->mac_enabled)
		return 0;
	if (zd->monitor) {
		err = zd1201_setconfig16(zd, ZD1201_RID_PROMISCUOUSMODE, 0);
		if (err)
			return err;
	}

	err = zd1201_docmd(zd, ZD1201_CMDCODE_DISABLE, 0, 0, 0);
	if (!err)
		zd->mac_enabled = 0;
	return err;
}

static int zd1201_mac_reset(struct zd1201 *zd)
{
	if (!zd->mac_enabled)
		return 0;
	zd1201_disable(zd);
	return zd1201_enable(zd);
}

static int zd1201_join(struct zd1201 *zd, char *essid, int essidlen)
{
	int err, val;
	char buf[IW_ESSID_MAX_SIZE+2];

	err = zd1201_disable(zd);
	if (err)
		return err;

	val = ZD1201_CNFAUTHENTICATION_OPENSYSTEM;
	val |= ZD1201_CNFAUTHENTICATION_SHAREDKEY;
	err = zd1201_setconfig16(zd, ZD1201_RID_CNFAUTHENTICATION, val);
	if (err)
		return err;

	*(__le16 *)buf = cpu_to_le16(essidlen);
	memcpy(buf+2, essid, essidlen);
	if (!zd->ap) {	/* Normal station */
		err = zd1201_setconfig(zd, ZD1201_RID_CNFDESIREDSSID, buf,
		    IW_ESSID_MAX_SIZE+2, 1);
		if (err)
			return err;
	} else {	/* AP */
		err = zd1201_setconfig(zd, ZD1201_RID_CNFOWNSSID, buf,
		    IW_ESSID_MAX_SIZE+2, 1);
		if (err)
			return err;
	}

	err = zd1201_setconfig(zd, ZD1201_RID_CNFOWNMACADDR, 
	    zd->dev->dev_addr, zd->dev->addr_len, 1);
	if (err)
		return err;

	err = zd1201_enable(zd);
	if (err)
		return err;

	msleep(100);
	return 0;
}

static int zd1201_net_open(struct net_device *dev)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;

	/* Start MAC with wildcard if no essid set */
	if (!zd->mac_enabled)
		zd1201_join(zd, zd->essid, zd->essidlen);
	netif_start_queue(dev);

	return 0;
}

static int zd1201_net_stop(struct net_device *dev)
{
	netif_stop_queue(dev);
	
	return 0;
}

/*
	RFC 1042 encapsulates Ethernet frames in 802.11 frames
	by prefixing them with 0xaa, 0xaa, 0x03) followed by a SNAP OID of 0
	(0x00, 0x00, 0x00). Zd requires an additional padding, copy
	of ethernet addresses, length of the standard RFC 1042 packet
	and a command byte (which is nul for tx).
	
	tx frame (from Wlan NG):
	RFC 1042:
		llc		0xAA 0xAA 0x03 (802.2 LLC)
		snap		0x00 0x00 0x00 (Ethernet encapsulated)
		type		2 bytes, Ethernet type field
		payload		(minus eth header)
	Zydas specific:
		padding		1B if (skb->len+8+1)%64==0
		Eth MAC addr	12 bytes, Ethernet MAC addresses
		length		2 bytes, RFC 1042 packet length 
				(llc+snap+type+payload)
		zd		1 null byte, zd1201 packet type
 */
static int zd1201_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	unsigned char *txbuf = zd->txdata;
	int txbuflen, pad = 0, err;
	struct urb *urb = zd->tx_urb;

	if (!zd->mac_enabled || zd->monitor) {
		zd->stats.tx_dropped++;
		kfree_skb(skb);
		return 0;
	}
	netif_stop_queue(dev);

	txbuflen = skb->len + 8 + 1;
	if (txbuflen%64 == 0) {
		pad = 1;
		txbuflen++;
	}
	txbuf[0] = 0xAA;
	txbuf[1] = 0xAA;
	txbuf[2] = 0x03;
	txbuf[3] = 0x00;	/* rfc1042 */
	txbuf[4] = 0x00;
	txbuf[5] = 0x00;

	memcpy(txbuf+6, skb->data+12, skb->len-12);
	if (pad)
		txbuf[skb->len-12+6]=0;
	memcpy(txbuf+skb->len-12+6+pad, skb->data, 12);
	*(__be16*)&txbuf[skb->len+6+pad] = htons(skb->len-12+6);
	txbuf[txbuflen-1] = 0;

	usb_fill_bulk_urb(urb, zd->usb, usb_sndbulkpipe(zd->usb, zd->endp_out),
	    txbuf, txbuflen, zd1201_usbtx, zd);

	err = usb_submit_urb(zd->tx_urb, GFP_ATOMIC);
	if (err) {
		zd->stats.tx_errors++;
		netif_start_queue(dev);
		return err;
	}
	zd->stats.tx_packets++;
	zd->stats.tx_bytes += skb->len;
	dev->trans_start = jiffies;
	kfree_skb(skb);

	return 0;
}

static void zd1201_tx_timeout(struct net_device *dev)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;

	if (!zd)
		return;
	dev_warn(&zd->usb->dev, "%s: TX timeout, shooting down urb\n",
	    dev->name);
	zd->tx_urb->transfer_flags |= URB_ASYNC_UNLINK;
	usb_unlink_urb(zd->tx_urb);
	zd->stats.tx_errors++;
	/* Restart the timeout to quiet the watchdog: */
	dev->trans_start = jiffies;
}

static int zd1201_set_mac_address(struct net_device *dev, void *p)
{
	struct sockaddr *addr = p;
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	int err;

	if (!zd)
		return -ENODEV;

	err = zd1201_setconfig(zd, ZD1201_RID_CNFOWNMACADDR, 
	    addr->sa_data, dev->addr_len, 1);
	if (err)
		return err;
	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);

	return zd1201_mac_reset(zd);
}

static struct net_device_stats *zd1201_get_stats(struct net_device *dev)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;

	return &zd->stats;
}

static struct iw_statistics *zd1201_get_wireless_stats(struct net_device *dev)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;

	return &zd->iwstats;
}

static void zd1201_set_multicast(struct net_device *dev)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	struct dev_mc_list *mc = dev->mc_list;
	unsigned char reqbuf[ETH_ALEN*ZD1201_MAXMULTI];
	int i;

	if (dev->mc_count > ZD1201_MAXMULTI)
		return;

	for (i=0; i<dev->mc_count; i++) {
		memcpy(reqbuf+i*ETH_ALEN, mc->dmi_addr, ETH_ALEN);
		mc = mc->next;
	}
	zd1201_setconfig(zd, ZD1201_RID_CNFGROUPADDRESS, reqbuf,
	    dev->mc_count*ETH_ALEN, 0);
	
}

static int zd1201_config_commit(struct net_device *dev, 
    struct iw_request_info *info, struct iw_point *data, char *essid)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;

	return zd1201_mac_reset(zd);
}

static int zd1201_get_name(struct net_device *dev,
    struct iw_request_info *info, char *name, char *extra)
{
	strcpy(name, "IEEE 802.11b");

	return 0;
}

static int zd1201_set_freq(struct net_device *dev,
    struct iw_request_info *info, struct iw_freq *freq, char *extra)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	short channel = 0;
	int err;

	if (freq->e == 0)
		channel = freq->m;
	else {
		if (freq->m >= 2482)
			channel = 14;
		if (freq->m >= 2407)
			channel = (freq->m-2407)/5;
	}

	err = zd1201_setconfig16(zd, ZD1201_RID_CNFOWNCHANNEL, channel);
	if (err)
		return err;

	zd1201_mac_reset(zd);

	return 0;
}

static int zd1201_get_freq(struct net_device *dev,
    struct iw_request_info *info, struct iw_freq *freq, char *extra)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	short channel;
	int err;

	err = zd1201_getconfig16(zd, ZD1201_RID_CNFOWNCHANNEL, &channel);
	if (err)
		return err;
	freq->e = 0;
	freq->m = channel;

	return 0;
}

static int zd1201_set_mode(struct net_device *dev,
    struct iw_request_info *info, __u32 *mode, char *extra)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	short porttype, monitor = 0;
	unsigned char buffer[IW_ESSID_MAX_SIZE+2];
	int err;

	if (zd->ap) {
		if (*mode != IW_MODE_MASTER)
			return -EINVAL;
		return 0;
	}

	err = zd1201_setconfig16(zd, ZD1201_RID_PROMISCUOUSMODE, 0);
	if (err)
		return err;
	zd->dev->type = ARPHRD_ETHER;
	switch(*mode) {
		case IW_MODE_MONITOR:
			monitor = 1;
			zd->dev->type = ARPHRD_IEEE80211;
			/* Make sure we are no longer associated with by
			   setting an 'impossible' essid.
			   (otherwise we mess up firmware)
			 */
			zd1201_join(zd, "\0-*#\0", 5);
			/* Put port in pIBSS */
		case 8: /* No pseudo-IBSS in wireless extensions (yet) */
			porttype = ZD1201_PORTTYPE_PSEUDOIBSS;
			break;
		case IW_MODE_ADHOC:
			porttype = ZD1201_PORTTYPE_IBSS;
			break;
		case IW_MODE_INFRA:
			porttype = ZD1201_PORTTYPE_BSS;
			break;
		default:
			return -EINVAL;
	}

	err = zd1201_setconfig16(zd, ZD1201_RID_CNFPORTTYPE, porttype);
	if (err)
		return err;
	if (zd->monitor && !monitor) {
			zd1201_disable(zd);
			*(__le16 *)buffer = cpu_to_le16(zd->essidlen);
			memcpy(buffer+2, zd->essid, zd->essidlen);
			err = zd1201_setconfig(zd, ZD1201_RID_CNFDESIREDSSID,
			    buffer, IW_ESSID_MAX_SIZE+2, 1);
			if (err)
				return err;
	}
	zd->monitor=monitor;
	/* If monitor mode is set we don't actually turn it on here since it
	 * is done during mac reset anyway (see zd1201_mac_enable).
	 */

	zd1201_mac_reset(zd);

	return 0;
}

static int zd1201_get_mode(struct net_device *dev,
    struct iw_request_info *info, __u32 *mode, char *extra)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	short porttype;
	int err;

	err = zd1201_getconfig16(zd, ZD1201_RID_CNFPORTTYPE, &porttype);
	if (err)
		return err;
	switch(porttype) {
		case ZD1201_PORTTYPE_IBSS:
			*mode = IW_MODE_ADHOC;
			break;
		case ZD1201_PORTTYPE_BSS:
			*mode = IW_MODE_INFRA;
			break;
		case ZD1201_PORTTYPE_WDS:
			*mode = IW_MODE_REPEAT;
			break;
		case ZD1201_PORTTYPE_PSEUDOIBSS:
			*mode = 8;/* No Pseudo-IBSS... */
			break;
		case ZD1201_PORTTYPE_AP:
			*mode = IW_MODE_MASTER;
			break;
		default:
			dev_dbg(&zd->usb->dev, "Unknown porttype: %d\n",
			    porttype);
			*mode = IW_MODE_AUTO;
	}
	if (zd->monitor)
		*mode = IW_MODE_MONITOR;

	return 0;
}

static int zd1201_get_range(struct net_device *dev,
    struct iw_request_info *info, struct iw_point *wrq, char *extra)
{
	struct iw_range *range = (struct iw_range *)extra;

	wrq->length = sizeof(struct iw_range);
	memset(range, 0, sizeof(struct iw_range));
	range->we_version_compiled = WIRELESS_EXT;
	range->we_version_source = WIRELESS_EXT;

	range->max_qual.qual = 128;
	range->max_qual.level = 128;
	range->max_qual.noise = 128;
	range->max_qual.updated = 7;

	range->encoding_size[0] = 5;
	range->encoding_size[1] = 13;
	range->num_encoding_sizes = 2;
	range->max_encoding_tokens = ZD1201_NUMKEYS;

	range->num_bitrates = 4;
	range->bitrate[0] = 1000000;
	range->bitrate[1] = 2000000;
	range->bitrate[2] = 5500000;
	range->bitrate[3] = 11000000;

	range->min_rts = 0;
	range->min_frag = ZD1201_FRAGMIN;
	range->max_rts = ZD1201_RTSMAX;
	range->min_frag = ZD1201_FRAGMAX;

	return 0;
}

/*	Little bit of magic here: we only get the quality if we poll
 *	for it, and we never get an actual request to trigger such
 *	a poll. Therefore we 'assume' that the user will soon ask for
 *	the stats after asking the bssid.
 */
static int zd1201_get_wap(struct net_device *dev,
    struct iw_request_info *info, struct sockaddr *ap_addr, char *extra)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	unsigned char buffer[6];

	if (!zd1201_getconfig(zd, ZD1201_RID_COMMSQUALITY, buffer, 6)) {
		/* Unfortunately the quality and noise reported is useless.
		   they seem to be accumulators that increase until you
		   read them, unless we poll on a fixed interval we can't
		   use them
		 */
		/*zd->iwstats.qual.qual = le16_to_cpu(((__le16 *)buffer)[0]);*/
		zd->iwstats.qual.level = le16_to_cpu(((__le16 *)buffer)[1]);
		/*zd->iwstats.qual.noise = le16_to_cpu(((__le16 *)buffer)[2]);*/
		zd->iwstats.qual.updated = 2;
	}

	return zd1201_getconfig(zd,ZD1201_RID_CURRENTBSSID,ap_addr->sa_data,6);
}

static int zd1201_set_scan(struct net_device *dev,
    struct iw_request_info *info, struct iw_point *srq, char *extra)
{
	/* We do everything in get_scan */
	return 0;
}

static int zd1201_get_scan(struct net_device *dev,
    struct iw_request_info *info, struct iw_point *srq, char *extra)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	int err, i, j, enabled_save;
	struct iw_event iwe;
	char *cev = extra;
	char *end_buf = extra + IW_SCAN_MAX_DATA;

	/* No scanning in AP mode */
	if (zd->ap)
		return -EOPNOTSUPP;

	/* Scan doesn't seem to work if disabled */
	enabled_save = zd->mac_enabled;
	zd1201_enable(zd);

	zd->rxdatas = 0;
	err = zd1201_docmd(zd, ZD1201_CMDCODE_INQUIRE, 
	     ZD1201_INQ_SCANRESULTS, 0, 0);
	if (err)
		return err;

	wait_event_interruptible(zd->rxdataq, zd->rxdatas);
	if (!zd->rxlen)
		return -EIO;

	if (le16_to_cpu(*(__le16*)&zd->rxdata[2]) != ZD1201_INQ_SCANRESULTS)
		return -EIO;

	for(i=8; i<zd->rxlen; i+=62) {
		iwe.cmd = SIOCGIWAP;
		iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
		memcpy(iwe.u.ap_addr.sa_data, zd->rxdata+i+6, 6);
		cev = iwe_stream_add_event(cev, end_buf, &iwe, IW_EV_ADDR_LEN);

		iwe.cmd = SIOCGIWESSID;
		iwe.u.data.length = zd->rxdata[i+16];
		iwe.u.data.flags = 1;
		cev = iwe_stream_add_point(cev, end_buf, &iwe, zd->rxdata+i+18);

		iwe.cmd = SIOCGIWMODE;
		if (zd->rxdata[i+14]&0x01)
			iwe.u.mode = IW_MODE_MASTER;
		else
			iwe.u.mode = IW_MODE_ADHOC;
		cev = iwe_stream_add_event(cev, end_buf, &iwe, IW_EV_UINT_LEN);
		
		iwe.cmd = SIOCGIWFREQ;
		iwe.u.freq.m = zd->rxdata[i+0];
		iwe.u.freq.e = 0;
		cev = iwe_stream_add_event(cev, end_buf, &iwe, IW_EV_FREQ_LEN);
		
		iwe.cmd = SIOCGIWRATE;
		iwe.u.bitrate.fixed = 0;
		iwe.u.bitrate.disabled = 0;
		for (j=0; j<10; j++) if (zd->rxdata[i+50+j]) {
			iwe.u.bitrate.value = (zd->rxdata[i+50+j]&0x7f)*500000;
			cev=iwe_stream_add_event(cev, end_buf, &iwe,
			    IW_EV_PARAM_LEN);
		}
		
		iwe.cmd = SIOCGIWENCODE;
		iwe.u.data.length = 0;
		if (zd->rxdata[i+14]&0x10)
			iwe.u.data.flags = IW_ENCODE_ENABLED;
		else
			iwe.u.data.flags = IW_ENCODE_DISABLED;
		cev = iwe_stream_add_point(cev, end_buf, &iwe, NULL);
		
		iwe.cmd = IWEVQUAL;
		iwe.u.qual.qual = zd->rxdata[i+4];
		iwe.u.qual.noise= zd->rxdata[i+2]/10-100;
		iwe.u.qual.level = (256+zd->rxdata[i+4]*100)/255-100;
		iwe.u.qual.updated = 7;
		cev = iwe_stream_add_event(cev, end_buf, &iwe, IW_EV_QUAL_LEN);
	}

	if (!enabled_save)
		zd1201_disable(zd);

	srq->length = cev - extra;
	srq->flags = 0;

	return 0;
}

static int zd1201_set_essid(struct net_device *dev,
    struct iw_request_info *info, struct iw_point *data, char *essid)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;

	if (data->length > IW_ESSID_MAX_SIZE)
		return -EINVAL;
	if (data->length < 1)
		data->length = 1;
	zd->essidlen = data->length-1;
	memset(zd->essid, 0, IW_ESSID_MAX_SIZE+1);
	memcpy(zd->essid, essid, data->length);
	return zd1201_join(zd, zd->essid, zd->essidlen);
}

static int zd1201_get_essid(struct net_device *dev,
    struct iw_request_info *info, struct iw_point *data, char *essid)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;

	memcpy(essid, zd->essid, zd->essidlen);
	data->flags = 1;
	data->length = zd->essidlen;

	return 0;
}

static int zd1201_get_nick(struct net_device *dev, struct iw_request_info *info,
    struct iw_point *data, char *nick)
{
	strcpy(nick, "zd1201");
	data->flags = 1;
	data->length = strlen(nick);
	return 0;
}

static int zd1201_set_rate(struct net_device *dev,
    struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	short rate;
	int err;

	switch (rrq->value) {
		case 1000000:
			rate = ZD1201_RATEB1;
			break;
		case 2000000:
			rate = ZD1201_RATEB2;
			break;
		case 5500000:
			rate = ZD1201_RATEB5;
			break;
		case 11000000:
		default:
			rate = ZD1201_RATEB11;
			break;
	}
	if (!rrq->fixed) { /* Also enable all lower bitrates */
		rate |= rate-1;
	}
	
	err = zd1201_setconfig16(zd, ZD1201_RID_TXRATECNTL, rate);
	if (err)
		return err;

	return zd1201_mac_reset(zd);
}

static int zd1201_get_rate(struct net_device *dev,
    struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	short rate;
	int err;

	err = zd1201_getconfig16(zd, ZD1201_RID_CURRENTTXRATE, &rate);
	if (err)
		return err;

	switch(rate) {
		case 1:
			rrq->value = 1000000;
			break;
		case 2:
			rrq->value = 2000000;
			break;
		case 5:
			rrq->value = 5500000;
			break;
		case 11:
			rrq->value = 11000000;
			break;
		default:
			rrq->value = 0;
	}
	rrq->fixed = 0;
	rrq->disabled = 0;

	return 0;
}

static int zd1201_set_rts(struct net_device *dev, struct iw_request_info *info,
    struct iw_param *rts, char *extra)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	int err;
	short val = rts->value;

	if (rts->disabled || !rts->fixed)
		val = ZD1201_RTSMAX;
	if (val > ZD1201_RTSMAX)
		return -EINVAL;
	if (val < 0)
		return -EINVAL;

	err = zd1201_setconfig16(zd, ZD1201_RID_CNFRTSTHRESHOLD, val);
	if (err)
		return err;
	return zd1201_mac_reset(zd);
}

static int zd1201_get_rts(struct net_device *dev, struct iw_request_info *info,
    struct iw_param *rts, char *extra)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	short rtst;
	int err;

	err = zd1201_getconfig16(zd, ZD1201_RID_CNFRTSTHRESHOLD, &rtst);
	if (err)
		return err;
	rts->value = rtst;
	rts->disabled = (rts->value == ZD1201_RTSMAX);
	rts->fixed = 1;

	return 0;
}

static int zd1201_set_frag(struct net_device *dev, struct iw_request_info *info,
    struct iw_param *frag, char *extra)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	int err;
	short val = frag->value;

	if (frag->disabled || !frag->fixed)
		val = ZD1201_FRAGMAX;
	if (val > ZD1201_FRAGMAX)
		return -EINVAL;
	if (val < ZD1201_FRAGMIN)
		return -EINVAL;
	if (val & 1)
		return -EINVAL;
	err = zd1201_setconfig16(zd, ZD1201_RID_CNFFRAGTHRESHOLD, val);
	if (err)
		return err;
	return zd1201_mac_reset(zd);
}

static int zd1201_get_frag(struct net_device *dev, struct iw_request_info *info,
    struct iw_param *frag, char *extra)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	short fragt;
	int err;

	err = zd1201_getconfig16(zd, ZD1201_RID_CNFFRAGTHRESHOLD, &fragt);
	if (err)
		return err;
	frag->value = fragt;
	frag->disabled = (frag->value == ZD1201_FRAGMAX);
	frag->fixed = 1;

	return 0;
}

static int zd1201_set_retry(struct net_device *dev,
    struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
	return 0;
}

static int zd1201_get_retry(struct net_device *dev,
    struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
	return 0;
}

static int zd1201_set_encode(struct net_device *dev,
    struct iw_request_info *info, struct iw_point *erq, char *key)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	short i;
	int err, rid;

	if (erq->length > ZD1201_MAXKEYLEN)
		return -EINVAL;

	i = (erq->flags & IW_ENCODE_INDEX)-1;
	if (i == -1) {
		err = zd1201_getconfig16(zd,ZD1201_RID_CNFDEFAULTKEYID,&i);
		if (err)
			return err;
	} else {
		err = zd1201_setconfig16(zd, ZD1201_RID_CNFDEFAULTKEYID, i);
		if (err)
			return err;
	}

	if (i < 0 || i >= ZD1201_NUMKEYS)
		return -EINVAL;

	rid = ZD1201_RID_CNFDEFAULTKEY0 + i;
	err = zd1201_setconfig(zd, rid, key, erq->length, 1);
	if (err)
		return err;
	zd->encode_keylen[i] = erq->length;
	memcpy(zd->encode_keys[i], key, erq->length);

	i=0;
	if (!(erq->flags & IW_ENCODE_DISABLED & IW_ENCODE_MODE)) {
		i |= 0x01;
		zd->encode_enabled = 1;
	} else
		zd->encode_enabled = 0;
	if (erq->flags & IW_ENCODE_RESTRICTED & IW_ENCODE_MODE) {
		i |= 0x02;
		zd->encode_restricted = 1;
	} else
		zd->encode_restricted = 0;
	err = zd1201_setconfig16(zd, ZD1201_RID_CNFWEBFLAGS, i);
	if (err)
		return err;

	if (zd->encode_enabled)
		i = ZD1201_CNFAUTHENTICATION_SHAREDKEY;
	else
		i = ZD1201_CNFAUTHENTICATION_OPENSYSTEM;
	err = zd1201_setconfig16(zd, ZD1201_RID_CNFAUTHENTICATION, i);
	if (err)
		return err;

	return zd1201_mac_reset(zd);
}

static int zd1201_get_encode(struct net_device *dev,
    struct iw_request_info *info, struct iw_point *erq, char *key)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	short i;
	int err;

	if (zd->encode_enabled)
		erq->flags = IW_ENCODE_ENABLED;
	else
		erq->flags = IW_ENCODE_DISABLED;
	if (zd->encode_restricted)
		erq->flags |= IW_ENCODE_RESTRICTED;
	else
		erq->flags |= IW_ENCODE_OPEN;

	i = (erq->flags & IW_ENCODE_INDEX) -1;
	if (i == -1) {
		err = zd1201_getconfig16(zd, ZD1201_RID_CNFDEFAULTKEYID, &i);
		if (err)
			return err;
	}
	if (i<0 || i>= ZD1201_NUMKEYS)
		return -EINVAL;

	erq->flags |= i+1;
	
	erq->length = zd->encode_keylen[i];
	memcpy(key, zd->encode_keys[i], erq->length);

	return 0;
}

static int zd1201_set_power(struct net_device *dev, 
    struct iw_request_info *info, struct iw_param *vwrq, char *extra)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	short enabled, duration, level;
	int err;

	enabled = vwrq->disabled ? 0 : 1;
	if (enabled) {
		if (vwrq->flags & IW_POWER_PERIOD) {
			duration = vwrq->value;
			err = zd1201_setconfig16(zd, 
			    ZD1201_RID_CNFMAXSLEEPDURATION, duration);
			if (err)
				return err;
			goto out;
		}
		if (vwrq->flags & IW_POWER_TIMEOUT) {
			err = zd1201_getconfig16(zd, 
			    ZD1201_RID_CNFMAXSLEEPDURATION, &duration);
			if (err)
				return err;
			level = vwrq->value * 4 / duration;
			if (level > 4)
				level = 4;
			if (level < 0)
				level = 0;
			err = zd1201_setconfig16(zd, ZD1201_RID_CNFPMEPS,
			    level);
			if (err)
				return err;
			goto out;
		}
		return -EINVAL;
	}
out:
	err = zd1201_setconfig16(zd, ZD1201_RID_CNFPMENABLED, enabled);
	if (err)
		return err;

	return 0;
}

static int zd1201_get_power(struct net_device *dev,
    struct iw_request_info *info, struct iw_param *vwrq, char *extra)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	short enabled, level, duration;
	int err;

	err = zd1201_getconfig16(zd, ZD1201_RID_CNFPMENABLED, &enabled);
	if (err)
		return err;
	err = zd1201_getconfig16(zd, ZD1201_RID_CNFPMEPS, &level);
	if (err)
		return err;
	err = zd1201_getconfig16(zd, ZD1201_RID_CNFMAXSLEEPDURATION, &duration);
	if (err)
		return err;
	vwrq->disabled = enabled ? 0 : 1;
	if (vwrq->flags & IW_POWER_TYPE) {
		if (vwrq->flags & IW_POWER_PERIOD) {
			vwrq->value = duration;
			vwrq->flags = IW_POWER_PERIOD;
		} else {
			vwrq->value = duration * level / 4;
			vwrq->flags = IW_POWER_TIMEOUT;
		}
	}
	if (vwrq->flags & IW_POWER_MODE) {
		if (enabled && level)
			vwrq->flags = IW_POWER_UNICAST_R;
		else
			vwrq->flags = IW_POWER_ALL_R;
	}

	return 0;
}


static const iw_handler zd1201_iw_handler[] =
{
	(iw_handler) zd1201_config_commit,	/* SIOCSIWCOMMIT */
	(iw_handler) zd1201_get_name,    	/* SIOCGIWNAME */
	(iw_handler) NULL,			/* SIOCSIWNWID */
	(iw_handler) NULL,			/* SIOCGIWNWID */
	(iw_handler) zd1201_set_freq,		/* SIOCSIWFREQ */
	(iw_handler) zd1201_get_freq,		/* SIOCGIWFREQ */
	(iw_handler) zd1201_set_mode,		/* SIOCSIWMODE */
	(iw_handler) zd1201_get_mode,		/* SIOCGIWMODE */
	(iw_handler) NULL,                  	/* SIOCSIWSENS */
	(iw_handler) NULL,           		/* SIOCGIWSENS */
	(iw_handler) NULL,			/* SIOCSIWRANGE */
	(iw_handler) zd1201_get_range,           /* SIOCGIWRANGE */
	(iw_handler) NULL,			/* SIOCSIWPRIV */
	(iw_handler) NULL,			/* SIOCGIWPRIV */
	(iw_handler) NULL,			/* SIOCSIWSTATS */
	(iw_handler) NULL,			/* SIOCGIWSTATS */
	(iw_handler) NULL,			/* SIOCSIWSPY */
	(iw_handler) NULL,			/* SIOCGIWSPY */
	(iw_handler) NULL,			/* -- hole -- */
	(iw_handler) NULL,			/* -- hole -- */
	(iw_handler) NULL/*zd1201_set_wap*/,		/* SIOCSIWAP */
	(iw_handler) zd1201_get_wap,		/* SIOCGIWAP */
	(iw_handler) NULL,			/* -- hole -- */
	(iw_handler) NULL,       		/* SIOCGIWAPLIST */
	(iw_handler) zd1201_set_scan,		/* SIOCSIWSCAN */
	(iw_handler) zd1201_get_scan,		/* SIOCGIWSCAN */
	(iw_handler) zd1201_set_essid,		/* SIOCSIWESSID */
	(iw_handler) zd1201_get_essid,		/* SIOCGIWESSID */
	(iw_handler) NULL,         		/* SIOCSIWNICKN */
	(iw_handler) zd1201_get_nick, 		/* SIOCGIWNICKN */
	(iw_handler) NULL,			/* -- hole -- */
	(iw_handler) NULL,			/* -- hole -- */
	(iw_handler) zd1201_set_rate,		/* SIOCSIWRATE */
	(iw_handler) zd1201_get_rate,		/* SIOCGIWRATE */
	(iw_handler) zd1201_set_rts,		/* SIOCSIWRTS */
	(iw_handler) zd1201_get_rts,		/* SIOCGIWRTS */
	(iw_handler) zd1201_set_frag,		/* SIOCSIWFRAG */
	(iw_handler) zd1201_get_frag,		/* SIOCGIWFRAG */
	(iw_handler) NULL,         		/* SIOCSIWTXPOW */
	(iw_handler) NULL,          		/* SIOCGIWTXPOW */
	(iw_handler) zd1201_set_retry,		/* SIOCSIWRETRY */
	(iw_handler) zd1201_get_retry,		/* SIOCGIWRETRY */
	(iw_handler) zd1201_set_encode,		/* SIOCSIWENCODE */
	(iw_handler) zd1201_get_encode,		/* SIOCGIWENCODE */
	(iw_handler) zd1201_set_power,		/* SIOCSIWPOWER */
	(iw_handler) zd1201_get_power,		/* SIOCGIWPOWER */
};

static int zd1201_set_hostauth(struct net_device *dev,
    struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	int err;

	if (!zd->ap)
		return -EOPNOTSUPP;

	err = zd1201_setconfig16(zd, ZD1201_RID_CNFHOSTAUTH, rrq->value);
	if (err)
		return err;
	return 0;
}

static int zd1201_get_hostauth(struct net_device *dev,
    struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	short hostauth;
	int err;

	if (!zd->ap)
		return -EOPNOTSUPP;

	err = zd1201_getconfig16(zd, ZD1201_RID_CNFHOSTAUTH, &hostauth);
	if (err)
		return err;
	rrq->value = hostauth;
	rrq->fixed = 1;

	return 0;
}

static int zd1201_auth_sta(struct net_device *dev,
    struct iw_request_info *info, struct sockaddr *sta, char *extra)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	unsigned char buffer[10];

	if (!zd->ap)
		return -EOPNOTSUPP;

	memcpy(buffer, sta->sa_data, ETH_ALEN);
	*(short*)(buffer+6) = 0;	/* 0==success, 1==failure */
	*(short*)(buffer+8) = 0;

	return zd1201_setconfig(zd, ZD1201_RID_AUTHENTICATESTA, buffer, 10, 1);
}

static int zd1201_set_maxassoc(struct net_device *dev,
    struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	int err;

	if (!zd->ap)
		return -EOPNOTSUPP;

	err = zd1201_setconfig16(zd, ZD1201_RID_CNFMAXASSOCSTATIONS, rrq->value);
	if (err)
		return err;
	return 0;
}

static int zd1201_get_maxassoc(struct net_device *dev,
    struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
	struct zd1201 *zd = (struct zd1201 *)dev->priv;
	short maxassoc;
	int err;

	if (!zd->ap)
		return -EOPNOTSUPP;

	err = zd1201_getconfig16(zd, ZD1201_RID_CNFMAXASSOCSTATIONS, &maxassoc);
	if (err)
		return err;
	rrq->value = maxassoc;
	rrq->fixed = 1;

	return 0;
}

static const iw_handler zd1201_private_handler[] = {
	(iw_handler) zd1201_set_hostauth,	/* ZD1201SIWHOSTAUTH */
	(iw_handler) zd1201_get_hostauth,	/* ZD1201GIWHOSTAUTH */
	(iw_handler) zd1201_auth_sta,		/* ZD1201SIWAUTHSTA */
	(iw_handler) NULL,			/* nothing to get */
	(iw_handler) zd1201_set_maxassoc,	/* ZD1201SIMAXASSOC */
	(iw_handler) zd1201_get_maxassoc,	/* ZD1201GIMAXASSOC */
};

static const struct iw_priv_args zd1201_private_args[] = {
	{ ZD1201SIWHOSTAUTH, IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1,
	    IW_PRIV_TYPE_NONE, "sethostauth" },
	{ ZD1201GIWHOSTAUTH, IW_PRIV_TYPE_NONE,
	    IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, "gethostauth" },
	{ ZD1201SIWAUTHSTA, IW_PRIV_TYPE_ADDR | IW_PRIV_SIZE_FIXED | 1, 
	    IW_PRIV_TYPE_NONE, "authstation" },
	{ ZD1201SIWMAXASSOC, IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1,
	    IW_PRIV_TYPE_NONE, "setmaxassoc" },
	{ ZD1201GIWMAXASSOC, IW_PRIV_TYPE_NONE,
	    IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, "getmaxassoc" },
};

static const struct iw_handler_def zd1201_iw_handlers = {
	.num_standard 		= sizeof(zd1201_iw_handler)/sizeof(iw_handler),
	.num_private 		= sizeof(zd1201_private_handler)/sizeof(iw_handler),
	.num_private_args 	= sizeof(zd1201_private_args)/sizeof(struct iw_priv_args),
	.standard 		= (iw_handler *)zd1201_iw_handler,
	.private 		= (iw_handler *)zd1201_private_handler,
	.private_args 		= (struct iw_priv_args *) zd1201_private_args,
};

static int zd1201_probe(struct usb_interface *interface,
			const struct usb_device_id *id)
{
	struct zd1201 *zd;
	struct usb_device *usb;
	int i, err;
	short porttype;
	char buf[IW_ESSID_MAX_SIZE+2];

	usb = interface_to_usbdev(interface);

	zd = kmalloc(sizeof(struct zd1201), GFP_KERNEL);
	if (!zd) {
		return -ENOMEM;
	}
	memset(zd, 0, sizeof(struct zd1201));
	zd->ap = ap;
	zd->usb = usb;
	zd->removed = 0;
	init_waitqueue_head(&zd->rxdataq);
	INIT_HLIST_HEAD(&zd->fraglist);
	
	err = zd1201_fw_upload(usb, zd->ap);
	if (err) {
		dev_err(&usb->dev, "zd1201 firmware upload failed: %d\n", err);
		goto err_zd;
	}
	
	zd->endp_in = 1;
	zd->endp_out = 1;
	zd->endp_out2 = 2;
	zd->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
	zd->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!zd->rx_urb || !zd->tx_urb)
		goto err_zd;

	for(i = 0; i<100; i++)
		udelay(1000);

	err = zd1201_drvr_start(zd);
	if (err)
		goto err_zd;

	err = zd1201_setconfig16(zd, ZD1201_RID_CNFMAXDATALEN, 2312);
	if (err)
		goto err_start;

	err = zd1201_setconfig16(zd, ZD1201_RID_TXRATECNTL,
	    ZD1201_RATEB1 | ZD1201_RATEB2 | ZD1201_RATEB5 | ZD1201_RATEB11);
	if (err)
		goto err_start;

	zd->dev = alloc_etherdev(0);
	if (!zd->dev)
		goto err_start;

	zd->dev->priv = zd;
	zd->dev->open = zd1201_net_open;
	zd->dev->stop = zd1201_net_stop;
	zd->dev->get_stats = zd1201_get_stats;
	zd->dev->get_wireless_stats = zd1201_get_wireless_stats;
	zd->dev->wireless_handlers =
	    (struct iw_handler_def *)&zd1201_iw_handlers;
	zd->dev->hard_start_xmit = zd1201_hard_start_xmit;
	zd->dev->watchdog_timeo = ZD1201_TX_TIMEOUT;
	zd->dev->tx_timeout = zd1201_tx_timeout;
	zd->dev->set_multicast_list = zd1201_set_multicast;
	zd->dev->set_mac_address = zd1201_set_mac_address;
	strcpy(zd->dev->name, "wlan%d");

	err = zd1201_getconfig(zd, ZD1201_RID_CNFOWNMACADDR, 
	    zd->dev->dev_addr, zd->dev->addr_len);
	if (err)
		goto err_net;

	/* Set wildcard essid to match zd->essid */
	*(__le16 *)buf = cpu_to_le16(0);
	err = zd1201_setconfig(zd, ZD1201_RID_CNFDESIREDSSID, buf,
	    IW_ESSID_MAX_SIZE+2, 1);
	if (err)
		goto err_net;

	if (zd->ap)
		porttype = ZD1201_PORTTYPE_AP;
	else
		porttype = ZD1201_PORTTYPE_BSS;
	err = zd1201_setconfig16(zd, ZD1201_RID_CNFPORTTYPE, porttype);
	if (err)
		goto err_net;

	err = register_netdev(zd->dev);
	if (err)
		goto err_net;
	dev_info(&usb->dev, "%s: ZD1201 USB Wireless interface\n",
	    zd->dev->name);
	
	usb_set_intfdata(interface, zd);
	return 0;

err_net:
	free_netdev(zd->dev);
err_start:
	/* Leave the device in reset state */
	zd1201_docmd(zd, ZD1201_CMDCODE_INIT, 0, 0, 0);
err_zd:
	if (zd->tx_urb)
		usb_free_urb(zd->tx_urb);
	if (zd->rx_urb)
		usb_free_urb(zd->rx_urb);
	kfree(zd);
	return err;
}

static void zd1201_disconnect(struct usb_interface *interface)
{
	struct zd1201 *zd=(struct zd1201 *)usb_get_intfdata(interface);
	struct hlist_node *node, *node2;
	struct zd1201_frag *frag;

	if (!zd)
		return;
	usb_set_intfdata(interface, NULL);
	if (zd->dev) {
		unregister_netdev(zd->dev);
		free_netdev(zd->dev);
	}

	hlist_for_each_entry_safe(frag, node, node2, &zd->fraglist, fnode) {
		hlist_del_init(&frag->fnode);
		kfree_skb(frag->skb);
		kfree(frag);
	}

	if (zd->tx_urb) {
		usb_kill_urb(zd->tx_urb);
		usb_free_urb(zd->tx_urb);
	}
	if (zd->rx_urb) {
		usb_kill_urb(zd->rx_urb);
		usb_free_urb(zd->rx_urb);
	}
	kfree(zd);
}

#ifdef CONFIG_PM

static int zd1201_suspend(struct usb_interface *interface,
			   pm_message_t message)
{
	struct zd1201 *zd = usb_get_intfdata(interface);

	netif_device_detach(zd->dev);

	zd->was_enabled = zd->mac_enabled;

	if (zd->was_enabled)
		return zd1201_disable(zd);
	else
		return 0;
}

static int zd1201_resume(struct usb_interface *interface)
{
	struct zd1201 *zd = usb_get_intfdata(interface);

	if (!zd || !zd->dev)
		return -ENODEV;

	netif_device_attach(zd->dev);

	if (zd->was_enabled)
		return zd1201_enable(zd);
	else
		return 0;
}

#else

#define zd1201_suspend NULL
#define zd1201_resume  NULL

#endif

static struct usb_driver zd1201_usb = {
	.owner = THIS_MODULE,
	.name = "zd1201",
	.probe = zd1201_probe,
	.disconnect = zd1201_disconnect,
	.id_table = zd1201_table,
	.suspend = zd1201_suspend,
	.resume = zd1201_resume,
};

static int __init zd1201_init(void)
{
	return usb_register(&zd1201_usb);
}

static void __exit zd1201_cleanup(void)
{
	usb_deregister(&zd1201_usb);
}

module_init(zd1201_init);
module_exit(zd1201_cleanup);