drivers/net/usb/asix_common.c

   1 /*
   2  * ASIX AX8817X based USB 2.0 Ethernet Devices
   3  * Copyright (C) 2003-2006 David Hollis <dhollis@davehollis.com>
   4  * Copyright (C) 2005 Phil Chang <pchang23@sbcglobal.net>
   5  * Copyright (C) 2006 James Painter <jamie.painter@iname.com>
   6  * Copyright (c) 2002-2003 TiVo Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "asix.h"
  23
  24 int asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
  25                   u16 size, void *data, int in_pm)
  26 {
  27         int ret;
  28         int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
  29
  30         BUG_ON(!dev);
  31
  32         if (!in_pm)
  33                 fn = usbnet_read_cmd;
  34         else
  35                 fn = usbnet_read_cmd_nopm;
  36
  37         ret = fn(dev, cmd, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  38                  value, index, data, size);
  39
  40         if (unlikely(ret < 0))
  41                 netdev_warn(dev->net, "Failed to read reg index 0x%04x: %d\n",
  42                             index, ret);
  43
  44         return ret;
  45 }
  46
  47 int asix_write_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
  48                    u16 size, void *data, int in_pm)
  49 {
  50         int ret;
  51         int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
  52
  53         BUG_ON(!dev);
  54
  55         if (!in_pm)
  56                 fn = usbnet_write_cmd;
  57         else
  58                 fn = usbnet_write_cmd_nopm;
  59
  60         ret = fn(dev, cmd, USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  61                  value, index, data, size);
  62
  63         if (unlikely(ret < 0))
  64                 netdev_warn(dev->net, "Failed to write reg index 0x%04x: %d\n",
  65                             index, ret);
  66
  67         return ret;
  68 }
  69
  70 void asix_write_cmd_async(struct usbnet *dev, u8 cmd, u16 value, u16 index,
  71                           u16 size, void *data)
  72 {
  73         usbnet_write_cmd_async(dev, cmd,
  74                                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  75                                value, index, data, size);
  76 }
  77
  78 int asix_rx_fixup_internal(struct usbnet *dev, struct sk_buff *skb,
  79                            struct asix_rx_fixup_info *rx)
  80 {
  81         int offset = 0;
  82         u16 size;
  83
  84         /* When an Ethernet frame spans multiple URB socket buffers,
  85          * do a sanity test for the Data header synchronisation.
  86          * Attempt to detect the situation of the previous socket buffer having
  87          * been truncated or a socket buffer was missing. These situations
  88          * cause a discontinuity in the data stream and therefore need to avoid
  89          * appending bad data to the end of the current netdev socket buffer.
  90          * Also avoid unnecessarily discarding a good current netdev socket
  91          * buffer.
  92          */
  93         if (rx->remaining && (rx->remaining + sizeof(u32) <= skb->len)) {
  94                 offset = ((rx->remaining + 1) & 0xfffe);
  95                 rx->header = get_unaligned_le32(skb->data + offset);
  96                 offset = 0;
  97
  98                 size = (u16)(rx->header & 0x7ff);
  99                 if (size != ((~rx->header >> 16) & 0x7ff)) {
 100                         netdev_err(dev->net, "asix_rx_fixup() Data Header synchronisation was lost, remaining %d\n",
 101                                    rx->remaining);
 102                         if (rx->ax_skb) {
 103                                 kfree_skb(rx->ax_skb);
 104                                 rx->ax_skb = NULL;
 105                                 /* Discard the incomplete netdev Ethernet frame
 106                                  * and assume the Data header is at the start of
 107                                  * the current URB socket buffer.
 108                                  */
 109                         }
 110                         rx->remaining = 0;
 111                 }
 112         }
 113
 114         while (offset + sizeof(u16) <= skb->len) {
 115                 u16 copy_length;
 116                 unsigned char *data;
 117
 118                 if (!rx->remaining) {
 119                         if (skb->len - offset == sizeof(u16)) {
 120                                 rx->header = get_unaligned_le16(
 121                                                 skb->data + offset);
 122                                 rx->split_head = true;
 123                                 offset += sizeof(u16);
 124                                 break;
 125                         }
 126
 127                         if (rx->split_head == true) {
 128                                 rx->header |= (get_unaligned_le16(
 129                                                 skb->data + offset) << 16);
 130                                 rx->split_head = false;
 131                                 offset += sizeof(u16);
 132                         } else {
 133                                 rx->header = get_unaligned_le32(skb->data +
 134                                                                 offset);
 135                                 offset += sizeof(u32);
 136                         }
 137
 138                         /* take frame length from Data header 32-bit word */
 139                         size = (u16)(rx->header & 0x7ff);
 140                         if (size != ((~rx->header >> 16) & 0x7ff)) {
 141                                 netdev_err(dev->net, "asix_rx_fixup() Bad Header Length 0x%x, offset %d\n",
 142                                            rx->header, offset);
 143                                 return 0;
 144                         }
 145                         if (size > dev->net->mtu + ETH_HLEN + VLAN_HLEN) {
 146                                 netdev_dbg(dev->net, "asix_rx_fixup() Bad RX Length %d\n",
 147                                            size);
 148                                 return 0;
 149                         }
 150
 151                         /* Sometimes may fail to get a netdev socket buffer but
 152                          * continue to process the URB socket buffer so that
 153                          * synchronisation of the Ethernet frame Data header
 154                          * word is maintained.
 155                          */
 156                         rx->ax_skb = netdev_alloc_skb_ip_align(dev->net, size);
 157
 158                         rx->remaining = size;
 159                 }
 160
 161                 if (rx->remaining > skb->len - offset) {
 162                         copy_length = skb->len - offset;
 163                         rx->remaining -= copy_length;
 164                 } else {
 165                         copy_length = rx->remaining;
 166                         rx->remaining = 0;
 167                 }
 168
 169                 if (rx->ax_skb) {
 170                         data = skb_put(rx->ax_skb, copy_length);
 171                         memcpy(data, skb->data + offset, copy_length);
 172                         if (!rx->remaining)
 173                                 usbnet_skb_return(dev, rx->ax_skb);
 174                 }
 175
 176                 offset += (copy_length + 1) & 0xfffe;
 177         }
 178
 179         if (skb->len != offset) {
 180                 netdev_err(dev->net, "asix_rx_fixup() Bad SKB Length %d, %d\n",
 181                            skb->len, offset);
 182                 return 0;
 183         }
 184
 185         return 1;
 186 }
 187
 188 int asix_rx_fixup_common(struct usbnet *dev, struct sk_buff *skb)
 189 {
 190         struct asix_common_private *dp = dev->driver_priv;
 191         struct asix_rx_fixup_info *rx = &dp->rx_fixup_info;
 192
 193         return asix_rx_fixup_internal(dev, skb, rx);
 194 }
 195
 196 struct sk_buff *asix_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
 197                               gfp_t flags)
 198 {
 199         int padlen;
 200         int headroom = skb_headroom(skb);
 201         int tailroom = skb_tailroom(skb);
 202         u32 packet_len;
 203         u32 padbytes = 0xffff0000;
 204
 205         padlen = ((skb->len + 4) & (dev->maxpacket - 1)) ? 0 : 4;
 206
 207         /* We need to push 4 bytes in front of frame (packet_len)
 208          * and maybe add 4 bytes after the end (if padlen is 4)
 209          *
 210          * Avoid skb_copy_expand() expensive call, using following rules :
 211          * - We are allowed to push 4 bytes in headroom if skb_header_cloned()
 212          *   is false (and if we have 4 bytes of headroom)
 213          * - We are allowed to put 4 bytes at tail if skb_cloned()
 214          *   is false (and if we have 4 bytes of tailroom)
 215          *
 216          * TCP packets for example are cloned, but skb_header_release()
 217          * was called in tcp stack, allowing us to use headroom for our needs.
 218          */
 219         if (!skb_header_cloned(skb) &&
 220             !(padlen && skb_cloned(skb)) &&
 221             headroom + tailroom >= 4 + padlen) {
 222                 /* following should not happen, but better be safe */
 223                 if (headroom < 4 ||
 224                     tailroom < padlen) {
 225                         skb->data = memmove(skb->head + 4, skb->data, skb->len);
 226                         skb_set_tail_pointer(skb, skb->len);
 227                 }
 228         } else {
 229                 struct sk_buff *skb2;
 230
 231                 skb2 = skb_copy_expand(skb, 4, padlen, flags);
 232                 dev_kfree_skb_any(skb);
 233                 skb = skb2;
 234                 if (!skb)
 235                         return NULL;
 236         }
 237
 238         packet_len = ((skb->len ^ 0x0000ffff) << 16) + skb->len;
 239         skb_push(skb, 4);
 240         cpu_to_le32s(&packet_len);
 241         skb_copy_to_linear_data(skb, &packet_len, sizeof(packet_len));
 242
 243         if (padlen) {
 244                 cpu_to_le32s(&padbytes);
 245                 memcpy(skb_tail_pointer(skb), &padbytes, sizeof(padbytes));
 246                 skb_put(skb, sizeof(padbytes));
 247         }
 248
 249         usbnet_set_skb_tx_stats(skb, 1, 0);
 250         return skb;
 251 }
 252
 253 int asix_set_sw_mii(struct usbnet *dev, int in_pm)
 254 {
 255         int ret;
 256         ret = asix_write_cmd(dev, AX_CMD_SET_SW_MII, 0x0000, 0, 0, NULL, in_pm);
 257
 258         if (ret < 0)
 259                 netdev_err(dev->net, "Failed to enable software MII access\n");
 260         return ret;
 261 }
 262
 263 int asix_set_hw_mii(struct usbnet *dev, int in_pm)
 264 {
 265         int ret;
 266         ret = asix_write_cmd(dev, AX_CMD_SET_HW_MII, 0x0000, 0, 0, NULL, in_pm);
 267         if (ret < 0)
 268                 netdev_err(dev->net, "Failed to enable hardware MII access\n");
 269         return ret;
 270 }
 271
 272 int asix_read_phy_addr(struct usbnet *dev, int internal)
 273 {
 274         int offset = (internal ? 1 : 0);
 275         u8 buf[2];
 276         int ret = asix_read_cmd(dev, AX_CMD_READ_PHY_ID, 0, 0, 2, buf, 0);
 277
 278         netdev_dbg(dev->net, "asix_get_phy_addr()\n");
 279
 280         if (ret < 0) {
 281                 netdev_err(dev->net, "Error reading PHYID register: %02x\n", ret);
 282                 goto out;
 283         }
 284         netdev_dbg(dev->net, "asix_get_phy_addr() returning 0x%04x\n",
 285                    *((__le16 *)buf));
 286         ret = buf[offset];
 287
 288 out:
 289         return ret;
 290 }
 291
 292 int asix_get_phy_addr(struct usbnet *dev)
 293 {
 294         /* return the address of the internal phy */
 295         return asix_read_phy_addr(dev, 1);
 296 }
 297
 298
 299 int asix_sw_reset(struct usbnet *dev, u8 flags, int in_pm)
 300 {
 301         int ret;
 302
 303         ret = asix_write_cmd(dev, AX_CMD_SW_RESET, flags, 0, 0, NULL, in_pm);
 304         if (ret < 0)
 305                 netdev_err(dev->net, "Failed to send software reset: %02x\n", ret);
 306
 307         return ret;
 308 }
 309
 310 u16 asix_read_rx_ctl(struct usbnet *dev, int in_pm)
 311 {
 312         __le16 v;
 313         int ret = asix_read_cmd(dev, AX_CMD_READ_RX_CTL, 0, 0, 2, &v, in_pm);
 314
 315         if (ret < 0) {
 316                 netdev_err(dev->net, "Error reading RX_CTL register: %02x\n", ret);
 317                 goto out;
 318         }
 319         ret = le16_to_cpu(v);
 320 out:
 321         return ret;
 322 }
 323
 324 int asix_write_rx_ctl(struct usbnet *dev, u16 mode, int in_pm)
 325 {
 326         int ret;
 327
 328         netdev_dbg(dev->net, "asix_write_rx_ctl() - mode = 0x%04x\n", mode);
 329         ret = asix_write_cmd(dev, AX_CMD_WRITE_RX_CTL, mode, 0, 0, NULL, in_pm);
 330         if (ret < 0)
 331                 netdev_err(dev->net, "Failed to write RX_CTL mode to 0x%04x: %02x\n",
 332                            mode, ret);
 333
 334         return ret;
 335 }
 336
 337 u16 asix_read_medium_status(struct usbnet *dev, int in_pm)
 338 {
 339         __le16 v;
 340         int ret = asix_read_cmd(dev, AX_CMD_READ_MEDIUM_STATUS,
 341                                 0, 0, 2, &v, in_pm);
 342
 343         if (ret < 0) {
 344                 netdev_err(dev->net, "Error reading Medium Status register: %02x\n",
 345                            ret);
 346                 return ret;     /* TODO: callers not checking for error ret */
 347         }
 348
 349         return le16_to_cpu(v);
 350
 351 }
 352
 353 int asix_write_medium_mode(struct usbnet *dev, u16 mode, int in_pm)
 354 {
 355         int ret;
 356
 357         netdev_dbg(dev->net, "asix_write_medium_mode() - mode = 0x%04x\n", mode);
 358         ret = asix_write_cmd(dev, AX_CMD_WRITE_MEDIUM_MODE,
 359                              mode, 0, 0, NULL, in_pm);
 360         if (ret < 0)
 361                 netdev_err(dev->net, "Failed to write Medium Mode mode to 0x%04x: %02x\n",
 362                            mode, ret);
 363
 364         return ret;
 365 }
 366
 367 int asix_write_gpio(struct usbnet *dev, u16 value, int sleep, int in_pm)
 368 {
 369         int ret;
 370
 371         netdev_dbg(dev->net, "asix_write_gpio() - value = 0x%04x\n", value);
 372         ret = asix_write_cmd(dev, AX_CMD_WRITE_GPIOS, value, 0, 0, NULL, in_pm);
 373         if (ret < 0)
 374                 netdev_err(dev->net, "Failed to write GPIO value 0x%04x: %02x\n",
 375                            value, ret);
 376
 377         if (sleep)
 378                 msleep(sleep);
 379
 380         return ret;
 381 }
 382
 383 /*
 384  * AX88772 & AX88178 have a 16-bit RX_CTL value
 385  */
 386 void asix_set_multicast(struct net_device *net)
 387 {
 388         struct usbnet *dev = netdev_priv(net);
 389         struct asix_data *data = (struct asix_data *)&dev->data;
 390         u16 rx_ctl = AX_DEFAULT_RX_CTL;
 391
 392         if (net->flags & IFF_PROMISC) {
 393                 rx_ctl |= AX_RX_CTL_PRO;
 394         } else if (net->flags & IFF_ALLMULTI ||
 395                    netdev_mc_count(net) > AX_MAX_MCAST) {
 396                 rx_ctl |= AX_RX_CTL_AMALL;
 397         } else if (netdev_mc_empty(net)) {
 398                 /* just broadcast and directed */
 399         } else {
 400                 /* We use the 20 byte dev->data
 401                  * for our 8 byte filter buffer
 402                  * to avoid allocating memory that
 403                  * is tricky to free later */
 404                 struct netdev_hw_addr *ha;
 405                 u32 crc_bits;
 406
 407                 memset(data->multi_filter, 0, AX_MCAST_FILTER_SIZE);
 408
 409                 /* Build the multicast hash filter. */
 410                 netdev_for_each_mc_addr(ha, net) {
 411                         crc_bits = ether_crc(ETH_ALEN, ha->addr) >> 26;
 412                         data->multi_filter[crc_bits >> 3] |=
 413                             1 << (crc_bits & 7);
 414                 }
 415
 416                 asix_write_cmd_async(dev, AX_CMD_WRITE_MULTI_FILTER, 0, 0,
 417                                    AX_MCAST_FILTER_SIZE, data->multi_filter);
 418
 419                 rx_ctl |= AX_RX_CTL_AM;
 420         }
 421
 422         asix_write_cmd_async(dev, AX_CMD_WRITE_RX_CTL, rx_ctl, 0, 0, NULL);
 423 }
 424
 425 int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
 426 {
 427         struct usbnet *dev = netdev_priv(netdev);
 428         __le16 res;
 429         u8 smsr;
 430         int i = 0;
 431         int ret;
 432
 433         mutex_lock(&dev->phy_mutex);
 434         do {
 435                 ret = asix_set_sw_mii(dev, 0);
 436                 if (ret == -ENODEV || ret == -ETIMEDOUT)
 437                         break;
 438                 usleep_range(1000, 1100);
 439                 ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG,
 440                                     0, 0, 1, &smsr, 0);
 441         } while (!(smsr & AX_HOST_EN) && (i++ < 30) && (ret != -ENODEV));
 442         if (ret == -ENODEV || ret == -ETIMEDOUT) {
 443                 mutex_unlock(&dev->phy_mutex);
 444                 return ret;
 445         }
 446
 447         asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
 448                                 (__u16)loc, 2, &res, 0);
 449         asix_set_hw_mii(dev, 0);
 450         mutex_unlock(&dev->phy_mutex);
 451
 452         netdev_dbg(dev->net, "asix_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
 453                         phy_id, loc, le16_to_cpu(res));
 454
 455         return le16_to_cpu(res);
 456 }
 457
 458 void asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val)
 459 {
 460         struct usbnet *dev = netdev_priv(netdev);
 461         __le16 res = cpu_to_le16(val);
 462         u8 smsr;
 463         int i = 0;
 464         int ret;
 465
 466         netdev_dbg(dev->net, "asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
 467                         phy_id, loc, val);
 468
 469         mutex_lock(&dev->phy_mutex);
 470         do {
 471                 ret = asix_set_sw_mii(dev, 0);
 472                 if (ret == -ENODEV)
 473                         break;
 474                 usleep_range(1000, 1100);
 475                 ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG,
 476                                     0, 0, 1, &smsr, 0);
 477         } while (!(smsr & AX_HOST_EN) && (i++ < 30) && (ret != -ENODEV));
 478         if (ret == -ENODEV) {
 479                 mutex_unlock(&dev->phy_mutex);
 480                 return;
 481         }
 482
 483         asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id,
 484                        (__u16)loc, 2, &res, 0);
 485         asix_set_hw_mii(dev, 0);
 486         mutex_unlock(&dev->phy_mutex);
 487 }
 488
 489 int asix_mdio_read_nopm(struct net_device *netdev, int phy_id, int loc)
 490 {
 491         struct usbnet *dev = netdev_priv(netdev);
 492         __le16 res;
 493         u8 smsr;
 494         int i = 0;
 495         int ret;
 496
 497         mutex_lock(&dev->phy_mutex);
 498         do {
 499                 ret = asix_set_sw_mii(dev, 1);
 500                 if (ret == -ENODEV || ret == -ETIMEDOUT)
 501                         break;
 502                 usleep_range(1000, 1100);
 503                 ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG,
 504                                     0, 0, 1, &smsr, 1);
 505         } while (!(smsr & AX_HOST_EN) && (i++ < 30) && (ret != -ENODEV));
 506         if (ret == -ENODEV || ret == -ETIMEDOUT) {
 507                 mutex_unlock(&dev->phy_mutex);
 508                 return ret;
 509         }
 510
 511         asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
 512                       (__u16)loc, 2, &res, 1);
 513         asix_set_hw_mii(dev, 1);
 514         mutex_unlock(&dev->phy_mutex);
 515
 516         netdev_dbg(dev->net, "asix_mdio_read_nopm() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
 517                         phy_id, loc, le16_to_cpu(res));
 518
 519         return le16_to_cpu(res);
 520 }
 521
 522 void
 523 asix_mdio_write_nopm(struct net_device *netdev, int phy_id, int loc, int val)
 524 {
 525         struct usbnet *dev = netdev_priv(netdev);
 526         __le16 res = cpu_to_le16(val);
 527         u8 smsr;
 528         int i = 0;
 529         int ret;
 530
 531         netdev_dbg(dev->net, "asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
 532                         phy_id, loc, val);
 533
 534         mutex_lock(&dev->phy_mutex);
 535         do {
 536                 ret = asix_set_sw_mii(dev, 1);
 537                 if (ret == -ENODEV)
 538                         break;
 539                 usleep_range(1000, 1100);
 540                 ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG,
 541                                     0, 0, 1, &smsr, 1);
 542         } while (!(smsr & AX_HOST_EN) && (i++ < 30) && (ret != -ENODEV));
 543         if (ret == -ENODEV) {
 544                 mutex_unlock(&dev->phy_mutex);
 545                 return;
 546         }
 547
 548         asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id,
 549                        (__u16)loc, 2, &res, 1);
 550         asix_set_hw_mii(dev, 1);
 551         mutex_unlock(&dev->phy_mutex);
 552 }
 553
 554 void asix_get_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
 555 {
 556         struct usbnet *dev = netdev_priv(net);
 557         u8 opt;
 558
 559         if (asix_read_cmd(dev, AX_CMD_READ_MONITOR_MODE,
 560                           0, 0, 1, &opt, 0) < 0) {
 561                 wolinfo->supported = 0;
 562                 wolinfo->wolopts = 0;
 563                 return;
 564         }
 565         wolinfo->supported = WAKE_PHY | WAKE_MAGIC;
 566         wolinfo->wolopts = 0;
 567         if (opt & AX_MONITOR_LINK)
 568                 wolinfo->wolopts |= WAKE_PHY;
 569         if (opt & AX_MONITOR_MAGIC)
 570                 wolinfo->wolopts |= WAKE_MAGIC;
 571 }
 572
 573 int asix_set_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
 574 {
 575         struct usbnet *dev = netdev_priv(net);
 576         u8 opt = 0;
 577
 578         if (wolinfo->wolopts & WAKE_PHY)
 579                 opt |= AX_MONITOR_LINK;
 580         if (wolinfo->wolopts & WAKE_MAGIC)
 581                 opt |= AX_MONITOR_MAGIC;
 582
 583         if (asix_write_cmd(dev, AX_CMD_WRITE_MONITOR_MODE,
 584                               opt, 0, 0, NULL, 0) < 0)
 585                 return -EINVAL;
 586
 587         return 0;
 588 }
 589
 590 int asix_get_eeprom_len(struct net_device *net)
 591 {
 592         return AX_EEPROM_LEN;
 593 }
 594
 595 int asix_get_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom,
 596                     u8 *data)
 597 {
 598         struct usbnet *dev = netdev_priv(net);
 599         u16 *eeprom_buff;
 600         int first_word, last_word;
 601         int i;
 602
 603         if (eeprom->len == 0)
 604                 return -EINVAL;
 605
 606         eeprom->magic = AX_EEPROM_MAGIC;
 607
 608         first_word = eeprom->offset >> 1;
 609         last_word = (eeprom->offset + eeprom->len - 1) >> 1;
 610
 611         eeprom_buff = kmalloc(sizeof(u16) * (last_word - first_word + 1),
 612                               GFP_KERNEL);
 613         if (!eeprom_buff)
 614                 return -ENOMEM;
 615
 616         /* ax8817x returns 2 bytes from eeprom on read */
 617         for (i = first_word; i <= last_word; i++) {
 618                 if (asix_read_cmd(dev, AX_CMD_READ_EEPROM, i, 0, 2,
 619                                   &eeprom_buff[i - first_word], 0) < 0) {
 620                         kfree(eeprom_buff);
 621                         return -EIO;
 622                 }
 623         }
 624
 625         memcpy(data, (u8 *)eeprom_buff + (eeprom->offset & 1), eeprom->len);
 626         kfree(eeprom_buff);
 627         return 0;
 628 }
 629
 630 int asix_set_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom,
 631                     u8 *data)
 632 {
 633         struct usbnet *dev = netdev_priv(net);
 634         u16 *eeprom_buff;
 635         int first_word, last_word;
 636         int i;
 637         int ret;
 638
 639         netdev_dbg(net, "write EEPROM len %d, offset %d, magic 0x%x\n",
 640                    eeprom->len, eeprom->offset, eeprom->magic);
 641
 642         if (eeprom->len == 0)
 643                 return -EINVAL;
 644
 645         if (eeprom->magic != AX_EEPROM_MAGIC)
 646                 return -EINVAL;
 647
 648         first_word = eeprom->offset >> 1;
 649         last_word = (eeprom->offset + eeprom->len - 1) >> 1;
 650
 651         eeprom_buff = kmalloc(sizeof(u16) * (last_word - first_word + 1),
 652                               GFP_KERNEL);
 653         if (!eeprom_buff)
 654                 return -ENOMEM;
 655
 656         /* align data to 16 bit boundaries, read the missing data from
 657            the EEPROM */
 658         if (eeprom->offset & 1) {
 659                 ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, first_word, 0, 2,
 660                                     &eeprom_buff[0], 0);
 661                 if (ret < 0) {
 662                         netdev_err(net, "Failed to read EEPROM at offset 0x%02x.\n", first_word);
 663                         goto free;
 664                 }
 665         }
 666
 667         if ((eeprom->offset + eeprom->len) & 1) {
 668                 ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, last_word, 0, 2,
 669                                     &eeprom_buff[last_word - first_word], 0);
 670                 if (ret < 0) {
 671                         netdev_err(net, "Failed to read EEPROM at offset 0x%02x.\n", last_word);
 672                         goto free;
 673                 }
 674         }
 675
 676         memcpy((u8 *)eeprom_buff + (eeprom->offset & 1), data, eeprom->len);
 677
 678         /* write data to EEPROM */
 679         ret = asix_write_cmd(dev, AX_CMD_WRITE_ENABLE, 0x0000, 0, 0, NULL, 0);
 680         if (ret < 0) {
 681                 netdev_err(net, "Failed to enable EEPROM write\n");
 682                 goto free;
 683         }
 684         msleep(20);
 685
 686         for (i = first_word; i <= last_word; i++) {
 687                 netdev_dbg(net, "write to EEPROM at offset 0x%02x, data 0x%04x\n",
 688                            i, eeprom_buff[i - first_word]);
 689                 ret = asix_write_cmd(dev, AX_CMD_WRITE_EEPROM, i,
 690                                      eeprom_buff[i - first_word], 0, NULL, 0);
 691                 if (ret < 0) {
 692                         netdev_err(net, "Failed to write EEPROM at offset 0x%02x.\n",
 693                                    i);
 694                         goto free;
 695                 }
 696                 msleep(20);
 697         }
 698
 699         ret = asix_write_cmd(dev, AX_CMD_WRITE_DISABLE, 0x0000, 0, 0, NULL, 0);
 700         if (ret < 0) {
 701                 netdev_err(net, "Failed to disable EEPROM write\n");
 702                 goto free;
 703         }
 704
 705         ret = 0;
 706 free:
 707         kfree(eeprom_buff);
 708         return ret;
 709 }
 710
 711 void asix_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
 712 {
 713         /* Inherit standard device info */
 714         usbnet_get_drvinfo(net, info);
 715         strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
 716         strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
 717 }
 718
 719 int asix_set_mac_address(struct net_device *net, void *p)
 720 {
 721         struct usbnet *dev = netdev_priv(net);
 722         struct asix_data *data = (struct asix_data *)&dev->data;
 723         struct sockaddr *addr = p;
 724
 725         if (netif_running(net))
 726                 return -EBUSY;
 727         if (!is_valid_ether_addr(addr->sa_data))
 728                 return -EADDRNOTAVAIL;
 729
 730         memcpy(net->dev_addr, addr->sa_data, ETH_ALEN);
 731
 732         /* We use the 20 byte dev->data
 733          * for our 6 byte mac buffer
 734          * to avoid allocating memory that
 735          * is tricky to free later */
 736         memcpy(data->mac_addr, addr->sa_data, ETH_ALEN);
 737         asix_write_cmd_async(dev, AX_CMD_WRITE_NODE_ID, 0, 0, ETH_ALEN,
 738                                                         data->mac_addr);
 739
 740         return 0;
 741 }