1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * ASIX AX8817X based USB 2.0 Ethernet Devices
4 * Copyright (C) 2003-2006 David Hollis <dhollis@davehollis.com>
5 * Copyright (C) 2005 Phil Chang <pchang23@sbcglobal.net>
6 * Copyright (C) 2006 James Painter <jamie.painter@iname.com>
7 * Copyright (c) 2002-2003 TiVo Inc.
8 */
9
10#include "asix.h"
11
12#define AX_HOST_EN_RETRIES 30
13
14int __must_check asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
15 u16 size, void *data, int in_pm)
16{
17 int ret;
18 int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
19
20 BUG_ON(!dev);
21
22 if (!in_pm)
23 fn = usbnet_read_cmd;
24 else
25 fn = usbnet_read_cmd_nopm;
26
27 ret = fn(dev, cmd, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
28 value, index, data, size);
29
30 if (unlikely(ret < size)) {
31 ret = ret < 0 ? ret : -ENODATA;
32
33 netdev_warn(dev: dev->net, format: "Failed to read reg index 0x%04x: %d\n",
34 index, ret);
35 }
36
37 return ret;
38}
39
40int asix_write_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
41 u16 size, void *data, int in_pm)
42{
43 int ret;
44 int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
45
46 BUG_ON(!dev);
47
48 if (!in_pm)
49 fn = usbnet_write_cmd;
50 else
51 fn = usbnet_write_cmd_nopm;
52
53 ret = fn(dev, cmd, USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
54 value, index, data, size);
55
56 if (unlikely(ret < 0))
57 netdev_warn(dev: dev->net, format: "Failed to write reg index 0x%04x: %d\n",
58 index, ret);
59
60 return ret;
61}
62
63void asix_write_cmd_async(struct usbnet *dev, u8 cmd, u16 value, u16 index,
64 u16 size, void *data)
65{
66 usbnet_write_cmd_async(dev, cmd,
67 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
68 value, index, data, size);
69}
70
71static int asix_set_sw_mii(struct usbnet *dev, int in_pm)
72{
73 int ret;
74
75 ret = asix_write_cmd(dev, AX_CMD_SET_SW_MII, value: 0x0000, index: 0, size: 0, NULL, in_pm);
76
77 if (ret < 0)
78 netdev_err(dev: dev->net, format: "Failed to enable software MII access\n");
79 return ret;
80}
81
82static int asix_set_hw_mii(struct usbnet *dev, int in_pm)
83{
84 int ret;
85
86 ret = asix_write_cmd(dev, AX_CMD_SET_HW_MII, value: 0x0000, index: 0, size: 0, NULL, in_pm);
87 if (ret < 0)
88 netdev_err(dev: dev->net, format: "Failed to enable hardware MII access\n");
89 return ret;
90}
91
92static int asix_check_host_enable(struct usbnet *dev, int in_pm)
93{
94 int i, ret;
95 u8 smsr;
96
97 for (i = 0; i < AX_HOST_EN_RETRIES; ++i) {
98 ret = asix_set_sw_mii(dev, in_pm);
99 if (ret == -ENODEV || ret == -ETIMEDOUT)
100 break;
101 usleep_range(min: 1000, max: 1100);
102 ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG,
103 value: 0, index: 0, size: 1, data: &smsr, in_pm);
104 if (ret == -ENODEV)
105 break;
106 else if (ret < 0)
107 continue;
108 else if (smsr & AX_HOST_EN)
109 break;
110 }
111
112 return i >= AX_HOST_EN_RETRIES ? -ETIMEDOUT : ret;
113}
114
115static void reset_asix_rx_fixup_info(struct asix_rx_fixup_info *rx)
116{
117 /* Reset the variables that have a lifetime outside of
118 * asix_rx_fixup_internal() so that future processing starts from a
119 * known set of initial conditions.
120 */
121
122 if (rx->ax_skb) {
123 /* Discard any incomplete Ethernet frame in the netdev buffer */
124 kfree_skb(skb: rx->ax_skb);
125 rx->ax_skb = NULL;
126 }
127
128 /* Assume the Data header 32-bit word is at the start of the current
129 * or next URB socket buffer so reset all the state variables.
130 */
131 rx->remaining = 0;
132 rx->split_head = false;
133 rx->header = 0;
134}
135
136int asix_rx_fixup_internal(struct usbnet *dev, struct sk_buff *skb,
137 struct asix_rx_fixup_info *rx)
138{
139 int offset = 0;
140 u16 size;
141
142 /* When an Ethernet frame spans multiple URB socket buffers,
143 * do a sanity test for the Data header synchronisation.
144 * Attempt to detect the situation of the previous socket buffer having
145 * been truncated or a socket buffer was missing. These situations
146 * cause a discontinuity in the data stream and therefore need to avoid
147 * appending bad data to the end of the current netdev socket buffer.
148 * Also avoid unnecessarily discarding a good current netdev socket
149 * buffer.
150 */
151 if (rx->remaining && (rx->remaining + sizeof(u32) <= skb->len)) {
152 offset = ((rx->remaining + 1) & 0xfffe);
153 rx->header = get_unaligned_le32(p: skb->data + offset);
154 offset = 0;
155
156 size = (u16)(rx->header & 0x7ff);
157 if (size != ((~rx->header >> 16) & 0x7ff)) {
158 netdev_err(dev: dev->net, format: "asix_rx_fixup() Data Header synchronisation was lost, remaining %d\n",
159 rx->remaining);
160 reset_asix_rx_fixup_info(rx);
161 }
162 }
163
164 while (offset + sizeof(u16) <= skb->len) {
165 u16 copy_length;
166
167 if (!rx->remaining) {
168 if (skb->len - offset == sizeof(u16)) {
169 rx->header = get_unaligned_le16(
170 p: skb->data + offset);
171 rx->split_head = true;
172 offset += sizeof(u16);
173 break;
174 }
175
176 if (rx->split_head == true) {
177 rx->header |= (get_unaligned_le16(
178 p: skb->data + offset) << 16);
179 rx->split_head = false;
180 offset += sizeof(u16);
181 } else {
182 rx->header = get_unaligned_le32(p: skb->data +
183 offset);
184 offset += sizeof(u32);
185 }
186
187 /* take frame length from Data header 32-bit word */
188 size = (u16)(rx->header & 0x7ff);
189 if (size != ((~rx->header >> 16) & 0x7ff)) {
190 netdev_err(dev: dev->net, format: "asix_rx_fixup() Bad Header Length 0x%x, offset %d\n",
191 rx->header, offset);
192 reset_asix_rx_fixup_info(rx);
193 return 0;
194 }
195 if (size > dev->net->mtu + ETH_HLEN + VLAN_HLEN) {
196 netdev_dbg(dev->net, "asix_rx_fixup() Bad RX Length %d\n",
197 size);
198 reset_asix_rx_fixup_info(rx);
199 return 0;
200 }
201
202 /* Sometimes may fail to get a netdev socket buffer but
203 * continue to process the URB socket buffer so that
204 * synchronisation of the Ethernet frame Data header
205 * word is maintained.
206 */
207 rx->ax_skb = netdev_alloc_skb_ip_align(dev: dev->net, length: size);
208
209 rx->remaining = size;
210 }
211
212 if (rx->remaining > skb->len - offset) {
213 copy_length = skb->len - offset;
214 rx->remaining -= copy_length;
215 } else {
216 copy_length = rx->remaining;
217 rx->remaining = 0;
218 }
219
220 if (rx->ax_skb) {
221 skb_put_data(skb: rx->ax_skb, data: skb->data + offset,
222 len: copy_length);
223 if (!rx->remaining) {
224 usbnet_skb_return(dev, rx->ax_skb);
225 rx->ax_skb = NULL;
226 }
227 }
228
229 offset += (copy_length + 1) & 0xfffe;
230 }
231
232 if (skb->len != offset) {
233 netdev_err(dev: dev->net, format: "asix_rx_fixup() Bad SKB Length %d, %d\n",
234 skb->len, offset);
235 reset_asix_rx_fixup_info(rx);
236 return 0;
237 }
238
239 return 1;
240}
241
242int asix_rx_fixup_common(struct usbnet *dev, struct sk_buff *skb)
243{
244 struct asix_common_private *dp = dev->driver_priv;
245 struct asix_rx_fixup_info *rx = &dp->rx_fixup_info;
246
247 return asix_rx_fixup_internal(dev, skb, rx);
248}
249
250void asix_rx_fixup_common_free(struct asix_common_private *dp)
251{
252 struct asix_rx_fixup_info *rx;
253
254 if (!dp)
255 return;
256
257 rx = &dp->rx_fixup_info;
258
259 if (rx->ax_skb) {
260 kfree_skb(skb: rx->ax_skb);
261 rx->ax_skb = NULL;
262 }
263}
264
265struct sk_buff *asix_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
266 gfp_t flags)
267{
268 int padlen;
269 int headroom = skb_headroom(skb);
270 int tailroom = skb_tailroom(skb);
271 u32 packet_len;
272 u32 padbytes = 0xffff0000;
273 void *ptr;
274
275 padlen = ((skb->len + 4) & (dev->maxpacket - 1)) ? 0 : 4;
276
277 /* We need to push 4 bytes in front of frame (packet_len)
278 * and maybe add 4 bytes after the end (if padlen is 4)
279 *
280 * Avoid skb_copy_expand() expensive call, using following rules :
281 * - We are allowed to push 4 bytes in headroom if skb_header_cloned()
282 * is false (and if we have 4 bytes of headroom)
283 * - We are allowed to put 4 bytes at tail if skb_cloned()
284 * is false (and if we have 4 bytes of tailroom)
285 *
286 * TCP packets for example are cloned, but __skb_header_release()
287 * was called in tcp stack, allowing us to use headroom for our needs.
288 */
289 if (!skb_header_cloned(skb) &&
290 !(padlen && skb_cloned(skb)) &&
291 headroom + tailroom >= 4 + padlen) {
292 /* following should not happen, but better be safe */
293 if (headroom < 4 ||
294 tailroom < padlen) {
295 skb->data = memmove(skb->head + 4, skb->data, skb->len);
296 skb_set_tail_pointer(skb, offset: skb->len);
297 }
298 } else {
299 struct sk_buff *skb2;
300
301 skb2 = skb_copy_expand(skb, newheadroom: 4, newtailroom: padlen, priority: flags);
302 dev_kfree_skb_any(skb);
303 skb = skb2;
304 if (!skb)
305 return NULL;
306 }
307
308 packet_len = ((skb->len ^ 0x0000ffff) << 16) + skb->len;
309 ptr = skb_push(skb, len: 4);
310 put_unaligned_le32(val: packet_len, p: ptr);
311
312 if (padlen) {
313 put_unaligned_le32(val: padbytes, p: skb_tail_pointer(skb));
314 skb_put(skb, len: sizeof(padbytes));
315 }
316
317 usbnet_set_skb_tx_stats(skb, packets: 1, bytes_delta: 0);
318 return skb;
319}
320
321int asix_read_phy_addr(struct usbnet *dev, bool internal)
322{
323 int ret, offset;
324 u8 buf[2];
325
326 ret = asix_read_cmd(dev, AX_CMD_READ_PHY_ID, value: 0, index: 0, size: 2, data: buf, in_pm: 0);
327 if (ret < 0)
328 goto error;
329
330 if (ret < 2) {
331 ret = -EIO;
332 goto error;
333 }
334
335 offset = (internal ? 1 : 0);
336 ret = buf[offset];
337
338 if (ret >= PHY_MAX_ADDR) {
339 netdev_err(dev: dev->net, format: "invalid PHY address: %d\n", ret);
340 return -ENODEV;
341 }
342
343 netdev_dbg(dev->net, "%s PHY address 0x%x\n",
344 internal ? "internal" : "external", ret);
345
346 return ret;
347
348error:
349 netdev_err(dev: dev->net, format: "Error reading PHY_ID register: %02x\n", ret);
350
351 return ret;
352}
353
354int asix_sw_reset(struct usbnet *dev, u8 flags, int in_pm)
355{
356 int ret;
357
358 ret = asix_write_cmd(dev, AX_CMD_SW_RESET, value: flags, index: 0, size: 0, NULL, in_pm);
359 if (ret < 0)
360 netdev_err(dev: dev->net, format: "Failed to send software reset: %02x\n", ret);
361
362 return ret;
363}
364
365u16 asix_read_rx_ctl(struct usbnet *dev, int in_pm)
366{
367 __le16 v;
368 int ret = asix_read_cmd(dev, AX_CMD_READ_RX_CTL, value: 0, index: 0, size: 2, data: &v, in_pm);
369
370 if (ret < 0) {
371 netdev_err(dev: dev->net, format: "Error reading RX_CTL register: %02x\n", ret);
372 goto out;
373 }
374 ret = le16_to_cpu(v);
375out:
376 return ret;
377}
378
379int asix_write_rx_ctl(struct usbnet *dev, u16 mode, int in_pm)
380{
381 int ret;
382
383 netdev_dbg(dev->net, "asix_write_rx_ctl() - mode = 0x%04x\n", mode);
384 ret = asix_write_cmd(dev, AX_CMD_WRITE_RX_CTL, value: mode, index: 0, size: 0, NULL, in_pm);
385 if (ret < 0)
386 netdev_err(dev: dev->net, format: "Failed to write RX_CTL mode to 0x%04x: %02x\n",
387 mode, ret);
388
389 return ret;
390}
391
392u16 asix_read_medium_status(struct usbnet *dev, int in_pm)
393{
394 __le16 v;
395 int ret = asix_read_cmd(dev, AX_CMD_READ_MEDIUM_STATUS,
396 value: 0, index: 0, size: 2, data: &v, in_pm);
397
398 if (ret < 0) {
399 netdev_err(dev: dev->net, format: "Error reading Medium Status register: %02x\n",
400 ret);
401 return ret; /* TODO: callers not checking for error ret */
402 }
403
404 return le16_to_cpu(v);
405
406}
407
408int asix_write_medium_mode(struct usbnet *dev, u16 mode, int in_pm)
409{
410 int ret;
411
412 netdev_dbg(dev->net, "asix_write_medium_mode() - mode = 0x%04x\n", mode);
413 ret = asix_write_cmd(dev, AX_CMD_WRITE_MEDIUM_MODE,
414 value: mode, index: 0, size: 0, NULL, in_pm);
415 if (ret < 0)
416 netdev_err(dev: dev->net, format: "Failed to write Medium Mode mode to 0x%04x: %02x\n",
417 mode, ret);
418
419 return ret;
420}
421
422int asix_write_gpio(struct usbnet *dev, u16 value, int sleep, int in_pm)
423{
424 int ret;
425
426 netdev_dbg(dev->net, "asix_write_gpio() - value = 0x%04x\n", value);
427 ret = asix_write_cmd(dev, AX_CMD_WRITE_GPIOS, value, index: 0, size: 0, NULL, in_pm);
428 if (ret < 0)
429 netdev_err(dev: dev->net, format: "Failed to write GPIO value 0x%04x: %02x\n",
430 value, ret);
431
432 if (sleep)
433 msleep(msecs: sleep);
434
435 return ret;
436}
437
438/*
439 * AX88772 & AX88178 have a 16-bit RX_CTL value
440 */
441void asix_set_multicast(struct net_device *net)
442{
443 struct usbnet *dev = netdev_priv(dev: net);
444 struct asix_data *data = (struct asix_data *)&dev->data;
445 u16 rx_ctl = AX_DEFAULT_RX_CTL;
446
447 if (net->flags & IFF_PROMISC) {
448 rx_ctl |= AX_RX_CTL_PRO;
449 } else if (net->flags & IFF_ALLMULTI ||
450 netdev_mc_count(net) > AX_MAX_MCAST) {
451 rx_ctl |= AX_RX_CTL_AMALL;
452 } else if (netdev_mc_empty(net)) {
453 /* just broadcast and directed */
454 } else {
455 /* We use the 20 byte dev->data
456 * for our 8 byte filter buffer
457 * to avoid allocating memory that
458 * is tricky to free later */
459 struct netdev_hw_addr *ha;
460 u32 crc_bits;
461
462 memset(data->multi_filter, 0, AX_MCAST_FILTER_SIZE);
463
464 /* Build the multicast hash filter. */
465 netdev_for_each_mc_addr(ha, net) {
466 crc_bits = ether_crc(ETH_ALEN, ha->addr) >> 26;
467 data->multi_filter[crc_bits >> 3] |=
468 1 << (crc_bits & 7);
469 }
470
471 asix_write_cmd_async(dev, AX_CMD_WRITE_MULTI_FILTER, value: 0, index: 0,
472 AX_MCAST_FILTER_SIZE, data: data->multi_filter);
473
474 rx_ctl |= AX_RX_CTL_AM;
475 }
476
477 asix_write_cmd_async(dev, AX_CMD_WRITE_RX_CTL, value: rx_ctl, index: 0, size: 0, NULL);
478}
479
480static int __asix_mdio_read(struct net_device *netdev, int phy_id, int loc,
481 bool in_pm)
482{
483 struct usbnet *dev = netdev_priv(dev: netdev);
484 __le16 res;
485 int ret;
486
487 mutex_lock(&dev->phy_mutex);
488
489 ret = asix_check_host_enable(dev, in_pm);
490 if (ret == -ENODEV || ret == -ETIMEDOUT) {
491 mutex_unlock(lock: &dev->phy_mutex);
492 return ret;
493 }
494
495 ret = asix_read_cmd(dev, AX_CMD_READ_MII_REG, value: phy_id, index: (__u16)loc, size: 2,
496 data: &res, in_pm);
497 if (ret < 0)
498 goto out;
499
500 ret = asix_set_hw_mii(dev, in_pm);
501out:
502 mutex_unlock(lock: &dev->phy_mutex);
503
504 netdev_dbg(dev->net, "asix_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
505 phy_id, loc, le16_to_cpu(res));
506
507 return ret < 0 ? ret : le16_to_cpu(res);
508}
509
510int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
511{
512 return __asix_mdio_read(netdev, phy_id, loc, in_pm: false);
513}
514
515static int __asix_mdio_write(struct net_device *netdev, int phy_id, int loc,
516 int val, bool in_pm)
517{
518 struct usbnet *dev = netdev_priv(dev: netdev);
519 __le16 res = cpu_to_le16(val);
520 int ret;
521
522 netdev_dbg(dev->net, "asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
523 phy_id, loc, val);
524
525 mutex_lock(&dev->phy_mutex);
526
527 ret = asix_check_host_enable(dev, in_pm);
528 if (ret == -ENODEV)
529 goto out;
530
531 ret = asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, value: phy_id, index: (__u16)loc, size: 2,
532 data: &res, in_pm);
533 if (ret < 0)
534 goto out;
535
536 ret = asix_set_hw_mii(dev, in_pm);
537out:
538 mutex_unlock(lock: &dev->phy_mutex);
539
540 return ret < 0 ? ret : 0;
541}
542
543void asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val)
544{
545 __asix_mdio_write(netdev, phy_id, loc, val, in_pm: false);
546}
547
548/* MDIO read and write wrappers for phylib */
549int asix_mdio_bus_read(struct mii_bus *bus, int phy_id, int regnum)
550{
551 struct usbnet *priv = bus->priv;
552
553 return __asix_mdio_read(netdev: priv->net, phy_id, loc: regnum, in_pm: false);
554}
555
556int asix_mdio_bus_write(struct mii_bus *bus, int phy_id, int regnum, u16 val)
557{
558 struct usbnet *priv = bus->priv;
559
560 return __asix_mdio_write(netdev: priv->net, phy_id, loc: regnum, val, in_pm: false);
561}
562
563int asix_mdio_read_nopm(struct net_device *netdev, int phy_id, int loc)
564{
565 return __asix_mdio_read(netdev, phy_id, loc, in_pm: true);
566}
567
568void
569asix_mdio_write_nopm(struct net_device *netdev, int phy_id, int loc, int val)
570{
571 __asix_mdio_write(netdev, phy_id, loc, val, in_pm: true);
572}
573
574void asix_get_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
575{
576 struct usbnet *dev = netdev_priv(dev: net);
577 u8 opt;
578
579 if (asix_read_cmd(dev, AX_CMD_READ_MONITOR_MODE,
580 value: 0, index: 0, size: 1, data: &opt, in_pm: 0) < 0) {
581 wolinfo->supported = 0;
582 wolinfo->wolopts = 0;
583 return;
584 }
585 wolinfo->supported = WAKE_PHY | WAKE_MAGIC;
586 wolinfo->wolopts = 0;
587 if (opt & AX_MONITOR_LINK)
588 wolinfo->wolopts |= WAKE_PHY;
589 if (opt & AX_MONITOR_MAGIC)
590 wolinfo->wolopts |= WAKE_MAGIC;
591}
592
593int asix_set_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
594{
595 struct usbnet *dev = netdev_priv(dev: net);
596 u8 opt = 0;
597
598 if (wolinfo->wolopts & ~(WAKE_PHY | WAKE_MAGIC))
599 return -EINVAL;
600
601 if (wolinfo->wolopts & WAKE_PHY)
602 opt |= AX_MONITOR_LINK;
603 if (wolinfo->wolopts & WAKE_MAGIC)
604 opt |= AX_MONITOR_MAGIC;
605
606 if (asix_write_cmd(dev, AX_CMD_WRITE_MONITOR_MODE,
607 value: opt, index: 0, size: 0, NULL, in_pm: 0) < 0)
608 return -EINVAL;
609
610 return 0;
611}
612
613int asix_get_eeprom_len(struct net_device *net)
614{
615 return AX_EEPROM_LEN;
616}
617
618int asix_get_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom,
619 u8 *data)
620{
621 struct usbnet *dev = netdev_priv(dev: net);
622 u16 *eeprom_buff;
623 int first_word, last_word;
624 int i;
625
626 if (eeprom->len == 0)
627 return -EINVAL;
628
629 eeprom->magic = AX_EEPROM_MAGIC;
630
631 first_word = eeprom->offset >> 1;
632 last_word = (eeprom->offset + eeprom->len - 1) >> 1;
633
634 eeprom_buff = kmalloc_array(last_word - first_word + 1, sizeof(u16),
635 GFP_KERNEL);
636 if (!eeprom_buff)
637 return -ENOMEM;
638
639 /* ax8817x returns 2 bytes from eeprom on read */
640 for (i = first_word; i <= last_word; i++) {
641 if (asix_read_cmd(dev, AX_CMD_READ_EEPROM, value: i, index: 0, size: 2,
642 data: &eeprom_buff[i - first_word], in_pm: 0) < 0) {
643 kfree(objp: eeprom_buff);
644 return -EIO;
645 }
646 }
647
648 memcpy(data, (u8 *)eeprom_buff + (eeprom->offset & 1), eeprom->len);
649 kfree(objp: eeprom_buff);
650 return 0;
651}
652
653int asix_set_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom,
654 u8 *data)
655{
656 struct usbnet *dev = netdev_priv(dev: net);
657 u16 *eeprom_buff;
658 int first_word, last_word;
659 int i;
660 int ret;
661
662 netdev_dbg(net, "write EEPROM len %d, offset %d, magic 0x%x\n",
663 eeprom->len, eeprom->offset, eeprom->magic);
664
665 if (eeprom->len == 0)
666 return -EINVAL;
667
668 if (eeprom->magic != AX_EEPROM_MAGIC)
669 return -EINVAL;
670
671 first_word = eeprom->offset >> 1;
672 last_word = (eeprom->offset + eeprom->len - 1) >> 1;
673
674 eeprom_buff = kmalloc_array(last_word - first_word + 1, sizeof(u16),
675 GFP_KERNEL);
676 if (!eeprom_buff)
677 return -ENOMEM;
678
679 /* align data to 16 bit boundaries, read the missing data from
680 the EEPROM */
681 if (eeprom->offset & 1) {
682 ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, value: first_word, index: 0, size: 2,
683 data: &eeprom_buff[0], in_pm: 0);
684 if (ret < 0) {
685 netdev_err(dev: net, format: "Failed to read EEPROM at offset 0x%02x.\n", first_word);
686 goto free;
687 }
688 }
689
690 if ((eeprom->offset + eeprom->len) & 1) {
691 ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, value: last_word, index: 0, size: 2,
692 data: &eeprom_buff[last_word - first_word], in_pm: 0);
693 if (ret < 0) {
694 netdev_err(dev: net, format: "Failed to read EEPROM at offset 0x%02x.\n", last_word);
695 goto free;
696 }
697 }
698
699 memcpy((u8 *)eeprom_buff + (eeprom->offset & 1), data, eeprom->len);
700
701 /* write data to EEPROM */
702 ret = asix_write_cmd(dev, AX_CMD_WRITE_ENABLE, value: 0x0000, index: 0, size: 0, NULL, in_pm: 0);
703 if (ret < 0) {
704 netdev_err(dev: net, format: "Failed to enable EEPROM write\n");
705 goto free;
706 }
707 msleep(msecs: 20);
708
709 for (i = first_word; i <= last_word; i++) {
710 netdev_dbg(net, "write to EEPROM at offset 0x%02x, data 0x%04x\n",
711 i, eeprom_buff[i - first_word]);
712 ret = asix_write_cmd(dev, AX_CMD_WRITE_EEPROM, value: i,
713 index: eeprom_buff[i - first_word], size: 0, NULL, in_pm: 0);
714 if (ret < 0) {
715 netdev_err(dev: net, format: "Failed to write EEPROM at offset 0x%02x.\n",
716 i);
717 goto free;
718 }
719 msleep(msecs: 20);
720 }
721
722 ret = asix_write_cmd(dev, AX_CMD_WRITE_DISABLE, value: 0x0000, index: 0, size: 0, NULL, in_pm: 0);
723 if (ret < 0) {
724 netdev_err(dev: net, format: "Failed to disable EEPROM write\n");
725 goto free;
726 }
727
728 ret = 0;
729free:
730 kfree(objp: eeprom_buff);
731 return ret;
732}
733
734void asix_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
735{
736 /* Inherit standard device info */
737 usbnet_get_drvinfo(net, info);
738 strscpy(info->driver, DRIVER_NAME, sizeof(info->driver));
739 strscpy(info->version, DRIVER_VERSION, sizeof(info->version));
740}
741
742int asix_set_mac_address(struct net_device *net, void *p)
743{
744 struct usbnet *dev = netdev_priv(dev: net);
745 struct asix_data *data = (struct asix_data *)&dev->data;
746 struct sockaddr *addr = p;
747
748 if (netif_running(dev: net))
749 return -EBUSY;
750 if (!is_valid_ether_addr(addr: addr->sa_data))
751 return -EADDRNOTAVAIL;
752
753 eth_hw_addr_set(dev: net, addr: addr->sa_data);
754
755 /* We use the 20 byte dev->data
756 * for our 6 byte mac buffer
757 * to avoid allocating memory that
758 * is tricky to free later */
759 memcpy(data->mac_addr, addr->sa_data, ETH_ALEN);
760 asix_write_cmd_async(dev, AX_CMD_WRITE_NODE_ID, value: 0, index: 0, ETH_ALEN,
761 data: data->mac_addr);
762
763 return 0;
764}
765

source code of linux/drivers/net/usb/asix_common.c