root/drivers/net/usb/mcs7830.c

DEFINITIONS

1. mcs7830_get_reg
2. mcs7830_set_reg
3. mcs7830_set_reg_async
4. mcs7830_hif_get_mac_address
5. mcs7830_hif_set_mac_address
6. mcs7830_set_mac_address
7. mcs7830_read_phy
8. mcs7830_write_phy
9. mcs7830_set_autoneg
10. mcs7830_get_rev
11. mcs7830_rev_C_fixup
12. mcs7830_mdio_read
13. mcs7830_mdio_write
14. mcs7830_ioctl
15. mcs7830_get_data
16. mcs7830_hif_update_multicast_hash
17. mcs7830_hif_update_config
18. mcs7830_data_set_multicast
19. mcs7830_apply_base_config
20. mcs7830_set_multicast
21. mcs7830_get_regs_len
22. mcs7830_get_drvinfo
23. mcs7830_get_regs
24. mcs7830_bind
25. mcs7830_rx_fixup
26. mcs7830_status
27. mcs7830_reset_resume

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * MOSCHIP MCS7830 based (7730/7830/7832) USB 2.0 Ethernet Devices
   4  *
   5  * based on usbnet.c, asix.c and the vendor provided mcs7830 driver
   6  *
   7  * Copyright (C) 2010 Andreas Mohr <andi@lisas.de>
   8  * Copyright (C) 2006 Arnd Bergmann <arnd@arndb.de>
   9  * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
  10  * Copyright (C) 2005 Phil Chang <pchang23@sbcglobal.net>
  11  * Copyright (c) 2002-2003 TiVo Inc.
  12  *
  13  * Definitions gathered from MOSCHIP, Data Sheet_7830DA.pdf (thanks!).
  14  *
  15  * 2010-12-19: add 7832 USB PID ("functionality same as MCS7830"),
  16  *             per active notification by manufacturer
  17  *
  18  * TODO:
  19  * - support HIF_REG_CONFIG_SLEEPMODE/HIF_REG_CONFIG_TXENABLE (via autopm?)
  20  * - implement ethtool_ops get_pauseparam/set_pauseparam
  21  *   via HIF_REG_PAUSE_THRESHOLD (>= revision C only!)
  22  * - implement get_eeprom/[set_eeprom]
  23  * - switch PHY on/off on ifup/ifdown (perhaps in usbnet.c, via MII)
  24  * - mcs7830_get_regs() handling is weird: for rev 2 we return 32 regs,
  25  *   can access only ~ 24, remaining user buffer is uninitialized garbage
  26  * - anything else?
  27  */
  28 
  29 #include <linux/crc32.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/ethtool.h>
  32 #include <linux/mii.h>
  33 #include <linux/module.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/slab.h>
  36 #include <linux/usb.h>
  37 #include <linux/usb/usbnet.h>
  38 
  39 /* requests */
  40 #define MCS7830_RD_BMREQ        (USB_DIR_IN  | USB_TYPE_VENDOR | \
  41                                  USB_RECIP_DEVICE)
  42 #define MCS7830_WR_BMREQ        (USB_DIR_OUT | USB_TYPE_VENDOR | \
  43                                  USB_RECIP_DEVICE)
  44 #define MCS7830_RD_BREQ         0x0E
  45 #define MCS7830_WR_BREQ         0x0D
  46 
  47 #define MCS7830_CTRL_TIMEOUT    1000
  48 #define MCS7830_MAX_MCAST       64
  49 
  50 #define MCS7830_VENDOR_ID       0x9710
  51 #define MCS7832_PRODUCT_ID      0x7832
  52 #define MCS7830_PRODUCT_ID      0x7830
  53 #define MCS7730_PRODUCT_ID      0x7730
  54 
  55 #define SITECOM_VENDOR_ID       0x0DF6
  56 #define LN_030_PRODUCT_ID       0x0021
  57 
  58 #define MCS7830_MII_ADVERTISE   (ADVERTISE_PAUSE_CAP | ADVERTISE_100FULL | \
  59                                  ADVERTISE_100HALF | ADVERTISE_10FULL | \
  60                                  ADVERTISE_10HALF | ADVERTISE_CSMA)
  61 
  62 /* HIF_REG_XX corresponding index value */
  63 enum {
  64         HIF_REG_MULTICAST_HASH                  = 0x00,
  65         HIF_REG_PACKET_GAP1                     = 0x08,
  66         HIF_REG_PACKET_GAP2                     = 0x09,
  67         HIF_REG_PHY_DATA                        = 0x0a,
  68         HIF_REG_PHY_CMD1                        = 0x0c,
  69            HIF_REG_PHY_CMD1_READ                = 0x40,
  70            HIF_REG_PHY_CMD1_WRITE               = 0x20,
  71            HIF_REG_PHY_CMD1_PHYADDR             = 0x01,
  72         HIF_REG_PHY_CMD2                        = 0x0d,
  73            HIF_REG_PHY_CMD2_PEND_FLAG_BIT       = 0x80,
  74            HIF_REG_PHY_CMD2_READY_FLAG_BIT      = 0x40,
  75         HIF_REG_CONFIG                          = 0x0e,
  76         /* hmm, spec sez: "R/W", "Except bit 3" (likely TXENABLE). */
  77            HIF_REG_CONFIG_CFG                   = 0x80,
  78            HIF_REG_CONFIG_SPEED100              = 0x40,
  79            HIF_REG_CONFIG_FULLDUPLEX_ENABLE     = 0x20,
  80            HIF_REG_CONFIG_RXENABLE              = 0x10,
  81            HIF_REG_CONFIG_TXENABLE              = 0x08,
  82            HIF_REG_CONFIG_SLEEPMODE             = 0x04,
  83            HIF_REG_CONFIG_ALLMULTICAST          = 0x02,
  84            HIF_REG_CONFIG_PROMISCUOUS           = 0x01,
  85         HIF_REG_ETHERNET_ADDR                   = 0x0f,
  86         HIF_REG_FRAME_DROP_COUNTER              = 0x15, /* 0..ff; reset: 0 */
  87         HIF_REG_PAUSE_THRESHOLD                 = 0x16,
  88            HIF_REG_PAUSE_THRESHOLD_DEFAULT      = 0,
  89 };
  90 
  91 /* Trailing status byte in Ethernet Rx frame */
  92 enum {
  93         MCS7830_RX_SHORT_FRAME          = 0x01, /* < 64 bytes */
  94         MCS7830_RX_LENGTH_ERROR         = 0x02, /* framelen != Ethernet length field */
  95         MCS7830_RX_ALIGNMENT_ERROR      = 0x04, /* non-even number of nibbles */
  96         MCS7830_RX_CRC_ERROR            = 0x08,
  97         MCS7830_RX_LARGE_FRAME          = 0x10, /* > 1518 bytes */
  98         MCS7830_RX_FRAME_CORRECT        = 0x20, /* frame is correct */
  99         /* [7:6] reserved */
 100 };
 101 
 102 struct mcs7830_data {
 103         u8 multi_filter[8];
 104         u8 config;
 105 };
 106 
 107 static const char driver_name[] = "MOSCHIP usb-ethernet driver";
 108 
 109 static int mcs7830_get_reg(struct usbnet *dev, u16 index, u16 size, void *data)
 110 {
 111         return usbnet_read_cmd(dev, MCS7830_RD_BREQ, MCS7830_RD_BMREQ,
 112                                 0x0000, index, data, size);
 113 }
 114 
 115 static int mcs7830_set_reg(struct usbnet *dev, u16 index, u16 size, const void *data)
 116 {
 117         return usbnet_write_cmd(dev, MCS7830_WR_BREQ, MCS7830_WR_BMREQ,
 118                                 0x0000, index, data, size);
 119 }
 120 
 121 static void mcs7830_set_reg_async(struct usbnet *dev, u16 index, u16 size, void *data)
 122 {
 123         usbnet_write_cmd_async(dev, MCS7830_WR_BREQ, MCS7830_WR_BMREQ,
 124                                 0x0000, index, data, size);
 125 }
 126 
 127 static int mcs7830_hif_get_mac_address(struct usbnet *dev, unsigned char *addr)
 128 {
 129         int ret = mcs7830_get_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN, addr);
 130         if (ret < 0)
 131                 return ret;
 132         return 0;
 133 }
 134 
 135 static int mcs7830_hif_set_mac_address(struct usbnet *dev, unsigned char *addr)
 136 {
 137         int ret = mcs7830_set_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN, addr);
 138 
 139         if (ret < 0)
 140                 return ret;
 141         return 0;
 142 }
 143 
 144 static int mcs7830_set_mac_address(struct net_device *netdev, void *p)
 145 {
 146         int ret;
 147         struct usbnet *dev = netdev_priv(netdev);
 148         struct sockaddr *addr = p;
 149 
 150         if (netif_running(netdev))
 151                 return -EBUSY;
 152 
 153         if (!is_valid_ether_addr(addr->sa_data))
 154                 return -EADDRNOTAVAIL;
 155 
 156         ret = mcs7830_hif_set_mac_address(dev, addr->sa_data);
 157 
 158         if (ret < 0)
 159                 return ret;
 160 
 161         /* it worked --> adopt it on netdev side */
 162         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
 163 
 164         return 0;
 165 }
 166 
 167 static int mcs7830_read_phy(struct usbnet *dev, u8 index)
 168 {
 169         int ret;
 170         int i;
 171         __le16 val;
 172 
 173         u8 cmd[2] = {
 174                 HIF_REG_PHY_CMD1_READ | HIF_REG_PHY_CMD1_PHYADDR,
 175                 HIF_REG_PHY_CMD2_PEND_FLAG_BIT | index,
 176         };
 177 
 178         mutex_lock(&dev->phy_mutex);
 179         /* write the MII command */
 180         ret = mcs7830_set_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
 181         if (ret < 0)
 182                 goto out;
 183 
 184         /* wait for the data to become valid, should be within < 1ms */
 185         for (i = 0; i < 10; i++) {
 186                 ret = mcs7830_get_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
 187                 if ((ret < 0) || (cmd[1] & HIF_REG_PHY_CMD2_READY_FLAG_BIT))
 188                         break;
 189                 ret = -EIO;
 190                 msleep(1);
 191         }
 192         if (ret < 0)
 193                 goto out;
 194 
 195         /* read actual register contents */
 196         ret = mcs7830_get_reg(dev, HIF_REG_PHY_DATA, 2, &val);
 197         if (ret < 0)
 198                 goto out;
 199         ret = le16_to_cpu(val);
 200         dev_dbg(&dev->udev->dev, "read PHY reg %02x: %04x (%d tries)\n",
 201                 index, val, i);
 202 out:
 203         mutex_unlock(&dev->phy_mutex);
 204         return ret;
 205 }
 206 
 207 static int mcs7830_write_phy(struct usbnet *dev, u8 index, u16 val)
 208 {
 209         int ret;
 210         int i;
 211         __le16 le_val;
 212 
 213         u8 cmd[2] = {
 214                 HIF_REG_PHY_CMD1_WRITE | HIF_REG_PHY_CMD1_PHYADDR,
 215                 HIF_REG_PHY_CMD2_PEND_FLAG_BIT | (index & 0x1F),
 216         };
 217 
 218         mutex_lock(&dev->phy_mutex);
 219 
 220         /* write the new register contents */
 221         le_val = cpu_to_le16(val);
 222         ret = mcs7830_set_reg(dev, HIF_REG_PHY_DATA, 2, &le_val);
 223         if (ret < 0)
 224                 goto out;
 225 
 226         /* write the MII command */
 227         ret = mcs7830_set_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
 228         if (ret < 0)
 229                 goto out;
 230 
 231         /* wait for the command to be accepted by the PHY */
 232         for (i = 0; i < 10; i++) {
 233                 ret = mcs7830_get_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
 234                 if ((ret < 0) || (cmd[1] & HIF_REG_PHY_CMD2_READY_FLAG_BIT))
 235                         break;
 236                 ret = -EIO;
 237                 msleep(1);
 238         }
 239         if (ret < 0)
 240                 goto out;
 241 
 242         ret = 0;
 243         dev_dbg(&dev->udev->dev, "write PHY reg %02x: %04x (%d tries)\n",
 244                 index, val, i);
 245 out:
 246         mutex_unlock(&dev->phy_mutex);
 247         return ret;
 248 }
 249 
 250 /*
 251  * This algorithm comes from the original mcs7830 version 1.4 driver,
 252  * not sure if it is needed.
 253  */
 254 static int mcs7830_set_autoneg(struct usbnet *dev, int ptrUserPhyMode)
 255 {
 256         int ret;
 257         /* Enable all media types */
 258         ret = mcs7830_write_phy(dev, MII_ADVERTISE, MCS7830_MII_ADVERTISE);
 259 
 260         /* First reset BMCR */
 261         if (!ret)
 262                 ret = mcs7830_write_phy(dev, MII_BMCR, 0x0000);
 263         /* Enable Auto Neg */
 264         if (!ret)
 265                 ret = mcs7830_write_phy(dev, MII_BMCR, BMCR_ANENABLE);
 266         /* Restart Auto Neg (Keep the Enable Auto Neg Bit Set) */
 267         if (!ret)
 268                 ret = mcs7830_write_phy(dev, MII_BMCR,
 269                                 BMCR_ANENABLE | BMCR_ANRESTART  );
 270         return ret;
 271 }
 272 
 273 
 274 /*
 275  * if we can read register 22, the chip revision is C or higher
 276  */
 277 static int mcs7830_get_rev(struct usbnet *dev)
 278 {
 279         u8 dummy[2];
 280         int ret;
 281         ret = mcs7830_get_reg(dev, HIF_REG_FRAME_DROP_COUNTER, 2, dummy);
 282         if (ret > 0)
 283                 return 2; /* Rev C or later */
 284         return 1; /* earlier revision */
 285 }
 286 
 287 /*
 288  * On rev. C we need to set the pause threshold
 289  */
 290 static void mcs7830_rev_C_fixup(struct usbnet *dev)
 291 {
 292         u8 pause_threshold = HIF_REG_PAUSE_THRESHOLD_DEFAULT;
 293         int retry;
 294 
 295         for (retry = 0; retry < 2; retry++) {
 296                 if (mcs7830_get_rev(dev) == 2) {
 297                         dev_info(&dev->udev->dev, "applying rev.C fixup\n");
 298                         mcs7830_set_reg(dev, HIF_REG_PAUSE_THRESHOLD,
 299                                         1, &pause_threshold);
 300                 }
 301                 msleep(1);
 302         }
 303 }
 304 
 305 static int mcs7830_mdio_read(struct net_device *netdev, int phy_id,
 306                              int location)
 307 {
 308         struct usbnet *dev = netdev_priv(netdev);
 309         return mcs7830_read_phy(dev, location);
 310 }
 311 
 312 static void mcs7830_mdio_write(struct net_device *netdev, int phy_id,
 313                                 int location, int val)
 314 {
 315         struct usbnet *dev = netdev_priv(netdev);
 316         mcs7830_write_phy(dev, location, val);
 317 }
 318 
 319 static int mcs7830_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
 320 {
 321         struct usbnet *dev = netdev_priv(net);
 322         return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
 323 }
 324 
 325 static inline struct mcs7830_data *mcs7830_get_data(struct usbnet *dev)
 326 {
 327         return (struct mcs7830_data *)&dev->data;
 328 }
 329 
 330 static void mcs7830_hif_update_multicast_hash(struct usbnet *dev)
 331 {
 332         struct mcs7830_data *data = mcs7830_get_data(dev);
 333         mcs7830_set_reg_async(dev, HIF_REG_MULTICAST_HASH,
 334                                 sizeof data->multi_filter,
 335                                 data->multi_filter);
 336 }
 337 
 338 static void mcs7830_hif_update_config(struct usbnet *dev)
 339 {
 340         /* implementation specific to data->config
 341            (argument needs to be heap-based anyway - USB DMA!) */
 342         struct mcs7830_data *data = mcs7830_get_data(dev);
 343         mcs7830_set_reg_async(dev, HIF_REG_CONFIG, 1, &data->config);
 344 }
 345 
 346 static void mcs7830_data_set_multicast(struct net_device *net)
 347 {
 348         struct usbnet *dev = netdev_priv(net);
 349         struct mcs7830_data *data = mcs7830_get_data(dev);
 350 
 351         memset(data->multi_filter, 0, sizeof data->multi_filter);
 352 
 353         data->config = HIF_REG_CONFIG_TXENABLE;
 354 
 355         /* this should not be needed, but it doesn't work otherwise */
 356         data->config |= HIF_REG_CONFIG_ALLMULTICAST;
 357 
 358         if (net->flags & IFF_PROMISC) {
 359                 data->config |= HIF_REG_CONFIG_PROMISCUOUS;
 360         } else if (net->flags & IFF_ALLMULTI ||
 361                    netdev_mc_count(net) > MCS7830_MAX_MCAST) {
 362                 data->config |= HIF_REG_CONFIG_ALLMULTICAST;
 363         } else if (netdev_mc_empty(net)) {
 364                 /* just broadcast and directed */
 365         } else {
 366                 /* We use the 20 byte dev->data
 367                  * for our 8 byte filter buffer
 368                  * to avoid allocating memory that
 369                  * is tricky to free later */
 370                 struct netdev_hw_addr *ha;
 371                 u32 crc_bits;
 372 
 373                 /* Build the multicast hash filter. */
 374                 netdev_for_each_mc_addr(ha, net) {
 375                         crc_bits = ether_crc(ETH_ALEN, ha->addr) >> 26;
 376                         data->multi_filter[crc_bits >> 3] |= 1 << (crc_bits & 7);
 377                 }
 378         }
 379 }
 380 
 381 static int mcs7830_apply_base_config(struct usbnet *dev)
 382 {
 383         int ret;
 384 
 385         /* re-configure known MAC (suspend case etc.) */
 386         ret = mcs7830_hif_set_mac_address(dev, dev->net->dev_addr);
 387         if (ret) {
 388                 dev_info(&dev->udev->dev, "Cannot set MAC address\n");
 389                 goto out;
 390         }
 391 
 392         /* Set up PHY */
 393         ret = mcs7830_set_autoneg(dev, 0);
 394         if (ret) {
 395                 dev_info(&dev->udev->dev, "Cannot set autoneg\n");
 396                 goto out;
 397         }
 398 
 399         mcs7830_hif_update_multicast_hash(dev);
 400         mcs7830_hif_update_config(dev);
 401 
 402         mcs7830_rev_C_fixup(dev);
 403         ret = 0;
 404 out:
 405         return ret;
 406 }
 407 
 408 /* credits go to asix_set_multicast */
 409 static void mcs7830_set_multicast(struct net_device *net)
 410 {
 411         struct usbnet *dev = netdev_priv(net);
 412 
 413         mcs7830_data_set_multicast(net);
 414 
 415         mcs7830_hif_update_multicast_hash(dev);
 416         mcs7830_hif_update_config(dev);
 417 }
 418 
 419 static int mcs7830_get_regs_len(struct net_device *net)
 420 {
 421         struct usbnet *dev = netdev_priv(net);
 422 
 423         switch (mcs7830_get_rev(dev)) {
 424         case 1:
 425                 return 21;
 426         case 2:
 427                 return 32;
 428         }
 429         return 0;
 430 }
 431 
 432 static void mcs7830_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *drvinfo)
 433 {
 434         usbnet_get_drvinfo(net, drvinfo);
 435 }
 436 
 437 static void mcs7830_get_regs(struct net_device *net, struct ethtool_regs *regs, void *data)
 438 {
 439         struct usbnet *dev = netdev_priv(net);
 440 
 441         regs->version = mcs7830_get_rev(dev);
 442         mcs7830_get_reg(dev, 0, regs->len, data);
 443 }
 444 
 445 static const struct ethtool_ops mcs7830_ethtool_ops = {
 446         .get_drvinfo            = mcs7830_get_drvinfo,
 447         .get_regs_len           = mcs7830_get_regs_len,
 448         .get_regs               = mcs7830_get_regs,
 449 
 450         /* common usbnet calls */
 451         .get_link               = usbnet_get_link,
 452         .get_msglevel           = usbnet_get_msglevel,
 453         .set_msglevel           = usbnet_set_msglevel,
 454         .nway_reset             = usbnet_nway_reset,
 455         .get_link_ksettings     = usbnet_get_link_ksettings,
 456         .set_link_ksettings     = usbnet_set_link_ksettings,
 457 };
 458 
 459 static const struct net_device_ops mcs7830_netdev_ops = {
 460         .ndo_open               = usbnet_open,
 461         .ndo_stop               = usbnet_stop,
 462         .ndo_start_xmit         = usbnet_start_xmit,
 463         .ndo_tx_timeout         = usbnet_tx_timeout,
 464         .ndo_change_mtu         = usbnet_change_mtu,
 465         .ndo_get_stats64        = usbnet_get_stats64,
 466         .ndo_validate_addr      = eth_validate_addr,
 467         .ndo_do_ioctl           = mcs7830_ioctl,
 468         .ndo_set_rx_mode        = mcs7830_set_multicast,
 469         .ndo_set_mac_address    = mcs7830_set_mac_address,
 470 };
 471 
 472 static int mcs7830_bind(struct usbnet *dev, struct usb_interface *udev)
 473 {
 474         struct net_device *net = dev->net;
 475         int ret;
 476         int retry;
 477 
 478         /* Initial startup: Gather MAC address setting from EEPROM */
 479         ret = -EINVAL;
 480         for (retry = 0; retry < 5 && ret; retry++)
 481                 ret = mcs7830_hif_get_mac_address(dev, net->dev_addr);
 482         if (ret) {
 483                 dev_warn(&dev->udev->dev, "Cannot read MAC address\n");
 484                 goto out;
 485         }
 486 
 487         mcs7830_data_set_multicast(net);
 488 
 489         ret = mcs7830_apply_base_config(dev);
 490         if (ret)
 491                 goto out;
 492 
 493         net->ethtool_ops = &mcs7830_ethtool_ops;
 494         net->netdev_ops = &mcs7830_netdev_ops;
 495 
 496         /* reserve space for the status byte on rx */
 497         dev->rx_urb_size = ETH_FRAME_LEN + 1;
 498 
 499         dev->mii.mdio_read = mcs7830_mdio_read;
 500         dev->mii.mdio_write = mcs7830_mdio_write;
 501         dev->mii.dev = net;
 502         dev->mii.phy_id_mask = 0x3f;
 503         dev->mii.reg_num_mask = 0x1f;
 504         dev->mii.phy_id = *((u8 *) net->dev_addr + 1);
 505 
 506         ret = usbnet_get_endpoints(dev, udev);
 507 out:
 508         return ret;
 509 }
 510 
 511 /* The chip always appends a status byte that we need to strip */
 512 static int mcs7830_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
 513 {
 514         u8 status;
 515 
 516         /* This check is no longer done by usbnet */
 517         if (skb->len < dev->net->hard_header_len) {
 518                 dev_err(&dev->udev->dev, "unexpected tiny rx frame\n");
 519                 return 0;
 520         }
 521 
 522         skb_trim(skb, skb->len - 1);
 523         status = skb->data[skb->len];
 524 
 525         if (status != MCS7830_RX_FRAME_CORRECT) {
 526                 dev_dbg(&dev->udev->dev, "rx fixup status %x\n", status);
 527 
 528                 /* hmm, perhaps usbnet.c already sees a globally visible
 529                    frame error and increments rx_errors on its own already? */
 530                 dev->net->stats.rx_errors++;
 531 
 532                 if (status &    (MCS7830_RX_SHORT_FRAME
 533                                 |MCS7830_RX_LENGTH_ERROR
 534                                 |MCS7830_RX_LARGE_FRAME))
 535                         dev->net->stats.rx_length_errors++;
 536                 if (status & MCS7830_RX_ALIGNMENT_ERROR)
 537                         dev->net->stats.rx_frame_errors++;
 538                 if (status & MCS7830_RX_CRC_ERROR)
 539                         dev->net->stats.rx_crc_errors++;
 540         }
 541 
 542         return skb->len > 0;
 543 }
 544 
 545 static void mcs7830_status(struct usbnet *dev, struct urb *urb)
 546 {
 547         u8 *buf = urb->transfer_buffer;
 548         bool link, link_changed;
 549 
 550         if (urb->actual_length < 16)
 551                 return;
 552 
 553         link = !(buf[1] == 0x20);
 554         link_changed = netif_carrier_ok(dev->net) != link;
 555         if (link_changed) {
 556                 usbnet_link_change(dev, link, 0);
 557                 netdev_dbg(dev->net, "Link Status is: %d\n", link);
 558         }
 559 }
 560 
 561 static const struct driver_info moschip_info = {
 562         .description    = "MOSCHIP 7830/7832/7730 usb-NET adapter",
 563         .bind           = mcs7830_bind,
 564         .rx_fixup       = mcs7830_rx_fixup,
 565         .flags          = FLAG_ETHER | FLAG_LINK_INTR,
 566         .status         = mcs7830_status,
 567         .in             = 1,
 568         .out            = 2,
 569 };
 570 
 571 static const struct driver_info sitecom_info = {
 572         .description    = "Sitecom LN-30 usb-NET adapter",
 573         .bind           = mcs7830_bind,
 574         .rx_fixup       = mcs7830_rx_fixup,
 575         .flags          = FLAG_ETHER | FLAG_LINK_INTR,
 576         .status         = mcs7830_status,
 577         .in             = 1,
 578         .out            = 2,
 579 };
 580 
 581 static const struct usb_device_id products[] = {
 582         {
 583                 USB_DEVICE(MCS7830_VENDOR_ID, MCS7832_PRODUCT_ID),
 584                 .driver_info = (unsigned long) &moschip_info,
 585         },
 586         {
 587                 USB_DEVICE(MCS7830_VENDOR_ID, MCS7830_PRODUCT_ID),
 588                 .driver_info = (unsigned long) &moschip_info,
 589         },
 590         {
 591                 USB_DEVICE(MCS7830_VENDOR_ID, MCS7730_PRODUCT_ID),
 592                 .driver_info = (unsigned long) &moschip_info,
 593         },
 594         {
 595                 USB_DEVICE(SITECOM_VENDOR_ID, LN_030_PRODUCT_ID),
 596                 .driver_info = (unsigned long) &sitecom_info,
 597         },
 598         {},
 599 };
 600 MODULE_DEVICE_TABLE(usb, products);
 601 
 602 static int mcs7830_reset_resume (struct usb_interface *intf)
 603 {
 604         /* YES, this function is successful enough that ethtool -d
 605            does show same output pre-/post-suspend */
 606 
 607         struct usbnet           *dev = usb_get_intfdata(intf);
 608 
 609         mcs7830_apply_base_config(dev);
 610 
 611         usbnet_resume(intf);
 612 
 613         return 0;
 614 }
 615 
 616 static struct usb_driver mcs7830_driver = {
 617         .name = driver_name,
 618         .id_table = products,
 619         .probe = usbnet_probe,
 620         .disconnect = usbnet_disconnect,
 621         .suspend = usbnet_suspend,
 622         .resume = usbnet_resume,
 623         .reset_resume = mcs7830_reset_resume,
 624         .disable_hub_initiated_lpm = 1,
 625 };
 626 
 627 module_usb_driver(mcs7830_driver);
 628 
 629 MODULE_DESCRIPTION("USB to network adapter MCS7830)");
 630 MODULE_LICENSE("GPL");