aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/usb/mcs7830.c
blob: 03c2d8d653df1afa52ee90744f0b33ec4d7baec5 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
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
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
/*
 * MOSCHIP MCS7830 based (7730/7830/7832) USB 2.0 Ethernet Devices
 *
 * based on usbnet.c, asix.c and the vendor provided mcs7830 driver
 *
 * Copyright (C) 2010 Andreas Mohr <andi@lisas.de>
 * Copyright (C) 2006 Arnd Bergmann <arnd@arndb.de>
 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
 * Copyright (C) 2005 Phil Chang <pchang23@sbcglobal.net>
 * Copyright (c) 2002-2003 TiVo Inc.
 *
 * Definitions gathered from MOSCHIP, Data Sheet_7830DA.pdf (thanks!).
 *
 * 2010-12-19: add 7832 USB PID ("functionality same as MCS7830"),
 *             per active notification by manufacturer
 *
 * TODO:
 * - support HIF_REG_CONFIG_SLEEPMODE/HIF_REG_CONFIG_TXENABLE (via autopm?)
 * - implement ethtool_ops get_pauseparam/set_pauseparam
 *   via HIF_REG_PAUSE_THRESHOLD (>= revision C only!)
 * - implement get_eeprom/[set_eeprom]
 * - switch PHY on/off on ifup/ifdown (perhaps in usbnet.c, via MII)
 * - mcs7830_get_regs() handling is weird: for rev 2 we return 32 regs,
 *   can access only ~ 24, remaining user buffer is uninitialized garbage
 * - anything else?
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/crc32.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/init.h>
#include <linux/mii.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/usbnet.h>

/* requests */
#define MCS7830_RD_BMREQ	(USB_DIR_IN  | USB_TYPE_VENDOR | \
				 USB_RECIP_DEVICE)
#define MCS7830_WR_BMREQ	(USB_DIR_OUT | USB_TYPE_VENDOR | \
				 USB_RECIP_DEVICE)
#define MCS7830_RD_BREQ		0x0E
#define MCS7830_WR_BREQ		0x0D

#define MCS7830_CTRL_TIMEOUT	1000
#define MCS7830_MAX_MCAST	64

#define MCS7830_VENDOR_ID	0x9710
#define MCS7832_PRODUCT_ID	0x7832
#define MCS7830_PRODUCT_ID	0x7830
#define MCS7730_PRODUCT_ID	0x7730

#define SITECOM_VENDOR_ID	0x0DF6
#define LN_030_PRODUCT_ID	0x0021

#define MCS7830_MII_ADVERTISE	(ADVERTISE_PAUSE_CAP | ADVERTISE_100FULL | \
				 ADVERTISE_100HALF | ADVERTISE_10FULL | \
				 ADVERTISE_10HALF | ADVERTISE_CSMA)

/* HIF_REG_XX corresponding index value */
enum {
	HIF_REG_MULTICAST_HASH			= 0x00,
	HIF_REG_PACKET_GAP1			= 0x08,
	HIF_REG_PACKET_GAP2			= 0x09,
	HIF_REG_PHY_DATA			= 0x0a,
	HIF_REG_PHY_CMD1			= 0x0c,
	   HIF_REG_PHY_CMD1_READ		= 0x40,
	   HIF_REG_PHY_CMD1_WRITE		= 0x20,
	   HIF_REG_PHY_CMD1_PHYADDR		= 0x01,
	HIF_REG_PHY_CMD2			= 0x0d,
	   HIF_REG_PHY_CMD2_PEND_FLAG_BIT	= 0x80,
	   HIF_REG_PHY_CMD2_READY_FLAG_BIT	= 0x40,
	HIF_REG_CONFIG				= 0x0e,
	/* hmm, spec sez: "R/W", "Except bit 3" (likely TXENABLE). */
	   HIF_REG_CONFIG_CFG			= 0x80,
	   HIF_REG_CONFIG_SPEED100		= 0x40,
	   HIF_REG_CONFIG_FULLDUPLEX_ENABLE	= 0x20,
	   HIF_REG_CONFIG_RXENABLE		= 0x10,
	   HIF_REG_CONFIG_TXENABLE		= 0x08,
	   HIF_REG_CONFIG_SLEEPMODE		= 0x04,
	   HIF_REG_CONFIG_ALLMULTICAST		= 0x02,
	   HIF_REG_CONFIG_PROMISCUOUS		= 0x01,
	HIF_REG_ETHERNET_ADDR			= 0x0f,
	HIF_REG_FRAME_DROP_COUNTER		= 0x15, /* 0..ff; reset: 0 */
	HIF_REG_PAUSE_THRESHOLD			= 0x16,
	   HIF_REG_PAUSE_THRESHOLD_DEFAULT	= 0,
};

/* Trailing status byte in Ethernet Rx frame */
enum {
	MCS7830_RX_SHORT_FRAME		= 0x01, /* < 64 bytes */
	MCS7830_RX_LENGTH_ERROR		= 0x02, /* framelen != Ethernet length field */
	MCS7830_RX_ALIGNMENT_ERROR	= 0x04, /* non-even number of nibbles */
	MCS7830_RX_CRC_ERROR		= 0x08,
	MCS7830_RX_LARGE_FRAME		= 0x10, /* > 1518 bytes */
	MCS7830_RX_FRAME_CORRECT	= 0x20, /* frame is correct */
	/* [7:6] reserved */
};

struct mcs7830_data {
	u8 multi_filter[8];
	u8 config;
};

static const char driver_name[] = "MOSCHIP usb-ethernet driver";

static int mcs7830_get_reg(struct usbnet *dev, u16 index, u16 size, void *data)
{
	struct usb_device *xdev = dev->udev;
	int ret;
	void *buffer;

	buffer = kmalloc(size, GFP_NOIO);
	if (buffer == NULL)
		return -ENOMEM;

	ret = usb_control_msg(xdev, usb_rcvctrlpipe(xdev, 0), MCS7830_RD_BREQ,
			      MCS7830_RD_BMREQ, 0x0000, index, buffer,
			      size, MCS7830_CTRL_TIMEOUT);
	memcpy(data, buffer, size);
	kfree(buffer);

	return ret;
}

static int mcs7830_set_reg(struct usbnet *dev, u16 index, u16 size, const void *data)
{
	struct usb_device *xdev = dev->udev;
	int ret;
	void *buffer;

	buffer = kmemdup(data, size, GFP_NOIO);
	if (buffer == NULL)
		return -ENOMEM;

	ret = usb_control_msg(xdev, usb_sndctrlpipe(xdev, 0), MCS7830_WR_BREQ,
			      MCS7830_WR_BMREQ, 0x0000, index, buffer,
			      size, MCS7830_CTRL_TIMEOUT);
	kfree(buffer);
	return ret;
}

static void mcs7830_async_cmd_callback(struct urb *urb)
{
	struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
	int status = urb->status;

	if (status < 0)
		printk(KERN_DEBUG "%s() failed with %d\n",
		       __func__, status);

	kfree(req);
	usb_free_urb(urb);
}

static void mcs7830_set_reg_async(struct usbnet *dev, u16 index, u16 size, void *data)
{
	struct usb_ctrlrequest *req;
	int ret;
	struct urb *urb;

	urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!urb) {
		dev_dbg(&dev->udev->dev,
			"Error allocating URB in write_cmd_async!\n");
		return;
	}

	req = kmalloc(sizeof *req, GFP_ATOMIC);
	if (!req) {
		dev_err(&dev->udev->dev,
			"Failed to allocate memory for control request\n");
		goto out;
	}
	req->bRequestType = MCS7830_WR_BMREQ;
	req->bRequest = MCS7830_WR_BREQ;
	req->wValue = 0;
	req->wIndex = cpu_to_le16(index);
	req->wLength = cpu_to_le16(size);

	usb_fill_control_urb(urb, dev->udev,
			     usb_sndctrlpipe(dev->udev, 0),
			     (void *)req, data, size,
			     mcs7830_async_cmd_callback, req);

	ret = usb_submit_urb(urb, GFP_ATOMIC);
	if (ret < 0) {
		dev_err(&dev->udev->dev,
			"Error submitting the control message: ret=%d\n", ret);
		goto out;
	}
	return;
out:
	kfree(req);
	usb_free_urb(urb);
}

static int mcs7830_hif_get_mac_address(struct usbnet *dev, unsigned char *addr)
{
	int ret = mcs7830_get_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN, addr);
	if (ret < 0)
		return ret;
	return 0;
}

static int mcs7830_hif_set_mac_address(struct usbnet *dev, unsigned char *addr)
{
	int ret = mcs7830_set_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN, addr);

	if (ret < 0)
		return ret;
	return 0;
}

static int mcs7830_set_mac_address(struct net_device *netdev, void *p)
{
	int ret;
	struct usbnet *dev = netdev_priv(netdev);
	struct sockaddr *addr = p;

	if (netif_running(netdev))
		return -EBUSY;

	if (!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;

	ret = mcs7830_hif_set_mac_address(dev, addr->sa_data);

	if (ret < 0)
		return ret;

	/* it worked --> adopt it on netdev side */
	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);

	return 0;
}

static int mcs7830_read_phy(struct usbnet *dev, u8 index)
{
	int ret;
	int i;
	__le16 val;

	u8 cmd[2] = {
		HIF_REG_PHY_CMD1_READ | HIF_REG_PHY_CMD1_PHYADDR,
		HIF_REG_PHY_CMD2_PEND_FLAG_BIT | index,
	};

	mutex_lock(&dev->phy_mutex);
	/* write the MII command */
	ret = mcs7830_set_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
	if (ret < 0)
		goto out;

	/* wait for the data to become valid, should be within < 1ms */
	for (i = 0; i < 10; i++) {
		ret = mcs7830_get_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
		if ((ret < 0) || (cmd[1] & HIF_REG_PHY_CMD2_READY_FLAG_BIT))
			break;
		ret = -EIO;
		msleep(1);
	}
	if (ret < 0)
		goto out;

	/* read actual register contents */
	ret = mcs7830_get_reg(dev, HIF_REG_PHY_DATA, 2, &val);
	if (ret < 0)
		goto out;
	ret = le16_to_cpu(val);
	dev_dbg(&dev->udev->dev, "read PHY reg %02x: %04x (%d tries)\n",
		index, val, i);
out:
	mutex_unlock(&dev->phy_mutex);
	return ret;
}

static int mcs7830_write_phy(struct usbnet *dev, u8 index, u16 val)
{
	int ret;
	int i;
	__le16 le_val;

	u8 cmd[2] = {
		HIF_REG_PHY_CMD1_WRITE | HIF_REG_PHY_CMD1_PHYADDR,
		HIF_REG_PHY_CMD2_PEND_FLAG_BIT | (index & 0x1F),
	};

	mutex_lock(&dev->phy_mutex);

	/* write the new register contents */
	le_val = cpu_to_le16(val);
	ret = mcs7830_set_reg(dev, HIF_REG_PHY_DATA, 2, &le_val);
	if (ret < 0)
		goto out;

	/* write the MII command */
	ret = mcs7830_set_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
	if (ret < 0)
		goto out;

	/* wait for the command to be accepted by the PHY */
	for (i = 0; i < 10; i++) {
		ret = mcs7830_get_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
		if ((ret < 0) || (cmd[1] & HIF_REG_PHY_CMD2_READY_FLAG_BIT))
			break;
		ret = -EIO;
		msleep(1);
	}
	if (ret < 0)
		goto out;

	ret = 0;
	dev_dbg(&dev->udev->dev, "write PHY reg %02x: %04x (%d tries)\n",
		index, val, i);
out:
	mutex_unlock(&dev->phy_mutex);
	return ret;
}

/*
 * This algorithm comes from the original mcs7830 version 1.4 driver,
 * not sure if it is needed.
 */
static int mcs7830_set_autoneg(struct usbnet *dev, int ptrUserPhyMode)
{
	int ret;
	/* Enable all media types */
	ret = mcs7830_write_phy(dev, MII_ADVERTISE, MCS7830_MII_ADVERTISE);

	/* First reset BMCR */
	if (!ret)
		ret = mcs7830_write_phy(dev, MII_BMCR, 0x0000);
	/* Enable Auto Neg */
	if (!ret)
		ret = mcs7830_write_phy(dev, MII_BMCR, BMCR_ANENABLE);
	/* Restart Auto Neg (Keep the Enable Auto Neg Bit Set) */
	if (!ret)
		ret = mcs7830_write_phy(dev, MII_BMCR,
				BMCR_ANENABLE | BMCR_ANRESTART	);
	return ret;
}


/*
 * if we can read register 22, the chip revision is C or higher
 */
static int mcs7830_get_rev(struct usbnet *dev)
{
	u8 dummy[2];
	int ret;
	ret = mcs7830_get_reg(dev, HIF_REG_FRAME_DROP_COUNTER, 2, dummy);
	if (ret > 0)
		return 2; /* Rev C or later */
	return 1; /* earlier revision */
}

/*
 * On rev. C we need to set the pause threshold
 */
static void mcs7830_rev_C_fixup(struct usbnet *dev)
{
	u8 pause_threshold = HIF_REG_PAUSE_THRESHOLD_DEFAULT;
	int retry;

	for (retry = 0; retry < 2; retry++) {
		if (mcs7830_get_rev(dev) == 2) {
			dev_info(&dev->udev->dev, "applying rev.C fixup\n");
			mcs7830_set_reg(dev, HIF_REG_PAUSE_THRESHOLD,
					1, &pause_threshold);
		}
		msleep(1);
	}
}

static int mcs7830_mdio_read(struct net_device *netdev, int phy_id,
			     int location)
{
	struct usbnet *dev = netdev_priv(netdev);
	return mcs7830_read_phy(dev, location);
}

static void mcs7830_mdio_write(struct net_device *netdev, int phy_id,
				int location, int val)
{
	struct usbnet *dev = netdev_priv(netdev);
	mcs7830_write_phy(dev, location, val);
}

static int mcs7830_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
{
	struct usbnet *dev = netdev_priv(net);
	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
}

static inline struct mcs7830_data *mcs7830_get_data(struct usbnet *dev)
{
	return (struct mcs7830_data *)&dev->data;
}

static void mcs7830_hif_update_multicast_hash(struct usbnet *dev)
{
	struct mcs7830_data *data = mcs7830_get_data(dev);
	mcs7830_set_reg_async(dev, HIF_REG_MULTICAST_HASH,
				sizeof data->multi_filter,
				data->multi_filter);
}

static void mcs7830_hif_update_config(struct usbnet *dev)
{
	/* implementation specific to data->config
           (argument needs to be heap-based anyway - USB DMA!) */
	struct mcs7830_data *data = mcs7830_get_data(dev);
	mcs7830_set_reg_async(dev, HIF_REG_CONFIG, 1, &data->config);
}

static void mcs7830_data_set_multicast(struct net_device *net)
{
	struct usbnet *dev = netdev_priv(net);
	struct mcs7830_data *data = mcs7830_get_data(dev);

	memset(data->multi_filter, 0, sizeof data->multi_filter);

	data->config = HIF_REG_CONFIG_TXENABLE;

	/* this should not be needed, but it doesn't work otherwise */
	data->config |= HIF_REG_CONFIG_ALLMULTICAST;

	if (net->flags & IFF_PROMISC) {
		data->config |= HIF_REG_CONFIG_PROMISCUOUS;
	} else if (net->flags & IFF_ALLMULTI ||
		   netdev_mc_count(net) > MCS7830_MAX_MCAST) {
		data->config |= HIF_REG_CONFIG_ALLMULTICAST;
	} else if (netdev_mc_empty(net)) {
		/* just broadcast and directed */
	} else {
		/* We use the 20 byte dev->data
		 * for our 8 byte filter buffer
		 * to avoid allocating memory that
		 * is tricky to free later */
		struct netdev_hw_addr *ha;
		u32 crc_bits;

		/* Build the multicast hash filter. */
		netdev_for_each_mc_addr(ha, net) {
			crc_bits = ether_crc(ETH_ALEN, ha->addr) >> 26;
			data->multi_filter[crc_bits >> 3] |= 1 << (crc_bits & 7);
		}
	}
}

static int mcs7830_apply_base_config(struct usbnet *dev)
{
	int ret;

	/* re-configure known MAC (suspend case etc.) */
	ret = mcs7830_hif_set_mac_address(dev, dev->net->dev_addr);
	if (ret) {
		dev_info(&dev->udev->dev, "Cannot set MAC address\n");
		goto out;
	}

	/* Set up PHY */
	ret = mcs7830_set_autoneg(dev, 0);
	if (ret) {
		dev_info(&dev->udev->dev, "Cannot set autoneg\n");
		goto out;
	}

	mcs7830_hif_update_multicast_hash(dev);
	mcs7830_hif_update_config(dev);

	mcs7830_rev_C_fixup(dev);
	ret = 0;
out:
	return ret;
}

/* credits go to asix_set_multicast */
static void mcs7830_set_multicast(struct net_device *net)
{
	struct usbnet *dev = netdev_priv(net);

	mcs7830_data_set_multicast(net);

	mcs7830_hif_update_multicast_hash(dev);
	mcs7830_hif_update_config(dev);
}

static int mcs7830_get_regs_len(struct net_device *net)
{
	struct usbnet *dev = netdev_priv(net);

	switch (mcs7830_get_rev(dev)) {
	case 1:
		return 21;
	case 2:
		return 32;
	}
	return 0;
}

static void mcs7830_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *drvinfo)
{
	usbnet_get_drvinfo(net, drvinfo);
	drvinfo->regdump_len = mcs7830_get_regs_len(net);
}

static void mcs7830_get_regs(struct net_device *net, struct ethtool_regs *regs, void *data)
{
	struct usbnet *dev = netdev_priv(net);

	regs->version = mcs7830_get_rev(dev);
	mcs7830_get_reg(dev, 0, regs->len, data);
}

static const struct ethtool_ops mcs7830_ethtool_ops = {
	.get_drvinfo		= mcs7830_get_drvinfo,
	.get_regs_len		= mcs7830_get_regs_len,
	.get_regs		= mcs7830_get_regs,

	/* common usbnet calls */
	.get_link		= usbnet_get_link,
	.get_msglevel		= usbnet_get_msglevel,
	.set_msglevel		= usbnet_set_msglevel,
	.get_settings		= usbnet_get_settings,
	.set_settings		= usbnet_set_settings,
	.nway_reset		= usbnet_nway_reset,
};

static const struct net_device_ops mcs7830_netdev_ops = {
	.ndo_open		= usbnet_open,
	.ndo_stop		= usbnet_stop,
	.ndo_start_xmit		= usbnet_start_xmit,
	.ndo_tx_timeout		= usbnet_tx_timeout,
	.ndo_change_mtu		= usbnet_change_mtu,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_do_ioctl 		= mcs7830_ioctl,
	.ndo_set_rx_mode	= mcs7830_set_multicast,
	.ndo_set_mac_address	= mcs7830_set_mac_address,
};

static int mcs7830_bind(struct usbnet *dev, struct usb_interface *udev)
{
	struct net_device *net = dev->net;
	int ret;
	int retry;

	/* Initial startup: Gather MAC address setting from EEPROM */
	ret = -EINVAL;
	for (retry = 0; retry < 5 && ret; retry++)
		ret = mcs7830_hif_get_mac_address(dev, net->dev_addr);
	if (ret) {
		dev_warn(&dev->udev->dev, "Cannot read MAC address\n");
		goto out;
	}

	mcs7830_data_set_multicast(net);

	ret = mcs7830_apply_base_config(dev);
	if (ret)
		goto out;

	net->ethtool_ops = &mcs7830_ethtool_ops;
	net->netdev_ops = &mcs7830_netdev_ops;

	/* reserve space for the status byte on rx */
	dev->rx_urb_size = ETH_FRAME_LEN + 1;

	dev->mii.mdio_read = mcs7830_mdio_read;
	dev->mii.mdio_write = mcs7830_mdio_write;
	dev->mii.dev = net;
	dev->mii.phy_id_mask = 0x3f;
	dev->mii.reg_num_mask = 0x1f;
	dev->mii.phy_id = *((u8 *) net->dev_addr + 1);

	ret = usbnet_get_endpoints(dev, udev);
out:
	return ret;
}

/* The chip always appends a status byte that we need to strip */
static int mcs7830_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
{
	u8 status;

	if (skb->len == 0) {
		dev_err(&dev->udev->dev, "unexpected empty rx frame\n");
		return 0;
	}

	skb_trim(skb, skb->len - 1);
	status = skb->data[skb->len];

	if (status != MCS7830_RX_FRAME_CORRECT) {
		dev_dbg(&dev->udev->dev, "rx fixup status %x\n", status);

		/* hmm, perhaps usbnet.c already sees a globally visible
		   frame error and increments rx_errors on its own already? */
		dev->net->stats.rx_errors++;

		if (status &	(MCS7830_RX_SHORT_FRAME
				|MCS7830_RX_LENGTH_ERROR
				|MCS7830_RX_LARGE_FRAME))
			dev->net->stats.rx_length_errors++;
		if (status & MCS7830_RX_ALIGNMENT_ERROR)
			dev->net->stats.rx_frame_errors++;
		if (status & MCS7830_RX_CRC_ERROR)
			dev->net->stats.rx_crc_errors++;
	}

	return skb->len > 0;
}

static void mcs7830_status(struct usbnet *dev, struct urb *urb)
{
	u8 *buf = urb->transfer_buffer;
	bool link;

	if (urb->actual_length < 16)
		return;

	link = !(buf[1] & 0x20);
	if (netif_carrier_ok(dev->net) != link) {
		if (link) {
			netif_carrier_on(dev->net);
			usbnet_defer_kevent(dev, EVENT_LINK_RESET);
		} else
			netif_carrier_off(dev->net);
		netdev_dbg(dev->net, "Link Status is: %d\n", link);
	}
}

static const struct driver_info moschip_info = {
	.description	= "MOSCHIP 7830/7832/7730 usb-NET adapter",
	.bind		= mcs7830_bind,
	.rx_fixup	= mcs7830_rx_fixup,
	.flags		= FLAG_ETHER | FLAG_LINK_INTR,
	.status		= mcs7830_status,
	.in		= 1,
	.out		= 2,
};

static const struct driver_info sitecom_info = {
	.description    = "Sitecom LN-30 usb-NET adapter",
	.bind		= mcs7830_bind,
	.rx_fixup	= mcs7830_rx_fixup,
	.flags		= FLAG_ETHER | FLAG_LINK_INTR,
	.status		= mcs7830_status,
	.in		= 1,
	.out		= 2,
};

static const struct usb_device_id products[] = {
	{
		USB_DEVICE(MCS7830_VENDOR_ID, MCS7832_PRODUCT_ID),
		.driver_info = (unsigned long) &moschip_info,
	},
	{
		USB_DEVICE(MCS7830_VENDOR_ID, MCS7830_PRODUCT_ID),
		.driver_info = (unsigned long) &moschip_info,
	},
	{
		USB_DEVICE(MCS7830_VENDOR_ID, MCS7730_PRODUCT_ID),
		.driver_info = (unsigned long) &moschip_info,
	},
	{
		USB_DEVICE(SITECOM_VENDOR_ID, LN_030_PRODUCT_ID),
		.driver_info = (unsigned long) &sitecom_info,
	},
	{},
};
MODULE_DEVICE_TABLE(usb, products);

static int mcs7830_reset_resume (struct usb_interface *intf)
{
 	/* YES, this function is successful enough that ethtool -d
           does show same output pre-/post-suspend */

	struct usbnet		*dev = usb_get_intfdata(intf);

	mcs7830_apply_base_config(dev);

	usbnet_resume(intf);

	return 0;
}

static struct usb_driver mcs7830_driver = {
	.name = driver_name,
	.id_table = products,
	.probe = usbnet_probe,
	.disconnect = usbnet_disconnect,
	.suspend = usbnet_suspend,
	.resume = usbnet_resume,
	.reset_resume = mcs7830_reset_resume,
	.disable_hub_initiated_lpm = 1,
};

module_usb_driver(mcs7830_driver);

MODULE_DESCRIPTION("USB to network adapter MCS7830)");
MODULE_LICENSE("GPL");