drivers/net/usb/mcs7830.c

   1 /*
   2  * MOSCHIP MCS7830 based (7730/7830/7832) USB 2.0 Ethernet Devices
   3  *
   4  * based on usbnet.c, asix.c and the vendor provided mcs7830 driver
   5  *
   6  * Copyright (C) 2010 Andreas Mohr <andi@lisas.de>
   7  * Copyright (C) 2006 Arnd Bergmann <arnd@arndb.de>
   8  * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
   9  * Copyright (C) 2005 Phil Chang <pchang23@sbcglobal.net>
  10  * Copyright (c) 2002-2003 TiVo Inc.
  11  *
  12  * Definitions gathered from MOSCHIP, Data Sheet_7830DA.pdf (thanks!).
  13  *
  14  * 2010-12-19: add 7832 USB PID ("functionality same as MCS7830"),
  15  *             per active notification by manufacturer
  16  *
  17  * TODO:
  18  * - support HIF_REG_CONFIG_SLEEPMODE/HIF_REG_CONFIG_TXENABLE (via autopm?)
  19  * - implement ethtool_ops get_pauseparam/set_pauseparam
  20  *   via HIF_REG_PAUSE_THRESHOLD (>= revision C only!)
  21  * - implement get_eeprom/[set_eeprom]
  22  * - switch PHY on/off on ifup/ifdown (perhaps in usbnet.c, via MII)
  23  * - mcs7830_get_regs() handling is weird: for rev 2 we return 32 regs,
  24  *   can access only ~ 24, remaining user buffer is uninitialized garbage
  25  * - anything else?
  26  *
  27  *
  28  * This program is free software; you can redistribute it and/or modify
  29  * it under the terms of the GNU General Public License as published by
  30  * the Free Software Foundation; either version 2 of the License, or
  31  * (at your option) any later version.
  32  *
  33  * This program is distributed in the hope that it will be useful,
  34  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  35  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  36  * GNU General Public License for more details.
  37  *
  38  * You should have received a copy of the GNU General Public License
  39  * along with this program; if not, write to the Free Software
  40  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  41  */
  42
  43 #include <linux/crc32.h>
  44 #include <linux/etherdevice.h>
  45 #include <linux/ethtool.h>
  46 #include <linux/init.h>
  47 #include <linux/mii.h>
  48 #include <linux/module.h>
  49 #include <linux/netdevice.h>
  50 #include <linux/slab.h>
  51 #include <linux/usb.h>
  52 #include <linux/usb/usbnet.h>
  53
  54 /* requests */
  55 #define MCS7830_RD_BMREQ        (USB_DIR_IN  | USB_TYPE_VENDOR | \
  56                                  USB_RECIP_DEVICE)
  57 #define MCS7830_WR_BMREQ        (USB_DIR_OUT | USB_TYPE_VENDOR | \
  58                                  USB_RECIP_DEVICE)
  59 #define MCS7830_RD_BREQ         0x0E
  60 #define MCS7830_WR_BREQ         0x0D
  61
  62 #define MCS7830_CTRL_TIMEOUT    1000
  63 #define MCS7830_MAX_MCAST       64
  64
  65 #define MCS7830_VENDOR_ID       0x9710
  66 #define MCS7832_PRODUCT_ID      0x7832
  67 #define MCS7830_PRODUCT_ID      0x7830
  68 #define MCS7730_PRODUCT_ID      0x7730
  69
  70 #define SITECOM_VENDOR_ID       0x0DF6
  71 #define LN_030_PRODUCT_ID       0x0021
  72
  73 #define MCS7830_MII_ADVERTISE   (ADVERTISE_PAUSE_CAP | ADVERTISE_100FULL | \
  74                                  ADVERTISE_100HALF | ADVERTISE_10FULL | \
  75                                  ADVERTISE_10HALF | ADVERTISE_CSMA)
  76
  77 /* HIF_REG_XX corresponding index value */
  78 enum {
  79         HIF_REG_MULTICAST_HASH                  = 0x00,
  80         HIF_REG_PACKET_GAP1                     = 0x08,
  81         HIF_REG_PACKET_GAP2                     = 0x09,
  82         HIF_REG_PHY_DATA                        = 0x0a,
  83         HIF_REG_PHY_CMD1                        = 0x0c,
  84            HIF_REG_PHY_CMD1_READ                = 0x40,
  85            HIF_REG_PHY_CMD1_WRITE               = 0x20,
  86            HIF_REG_PHY_CMD1_PHYADDR             = 0x01,
  87         HIF_REG_PHY_CMD2                        = 0x0d,
  88            HIF_REG_PHY_CMD2_PEND_FLAG_BIT       = 0x80,
  89            HIF_REG_PHY_CMD2_READY_FLAG_BIT      = 0x40,
  90         HIF_REG_CONFIG                          = 0x0e,
  91         /* hmm, spec sez: "R/W", "Except bit 3" (likely TXENABLE). */
  92            HIF_REG_CONFIG_CFG                   = 0x80,
  93            HIF_REG_CONFIG_SPEED100              = 0x40,
  94            HIF_REG_CONFIG_FULLDUPLEX_ENABLE     = 0x20,
  95            HIF_REG_CONFIG_RXENABLE              = 0x10,
  96            HIF_REG_CONFIG_TXENABLE              = 0x08,
  97            HIF_REG_CONFIG_SLEEPMODE             = 0x04,
  98            HIF_REG_CONFIG_ALLMULTICAST          = 0x02,
  99            HIF_REG_CONFIG_PROMISCUOUS           = 0x01,
 100         HIF_REG_ETHERNET_ADDR                   = 0x0f,
 101         HIF_REG_FRAME_DROP_COUNTER              = 0x15, /* 0..ff; reset: 0 */
 102         HIF_REG_PAUSE_THRESHOLD                 = 0x16,
 103            HIF_REG_PAUSE_THRESHOLD_DEFAULT      = 0,
 104 };
 105
 106 /* Trailing status byte in Ethernet Rx frame */
 107 enum {
 108         MCS7830_RX_SHORT_FRAME          = 0x01, /* < 64 bytes */
 109         MCS7830_RX_LENGTH_ERROR         = 0x02, /* framelen != Ethernet length field */
 110         MCS7830_RX_ALIGNMENT_ERROR      = 0x04, /* non-even number of nibbles */
 111         MCS7830_RX_CRC_ERROR            = 0x08,
 112         MCS7830_RX_LARGE_FRAME          = 0x10, /* > 1518 bytes */
 113         MCS7830_RX_FRAME_CORRECT        = 0x20, /* frame is correct */
 114         /* [7:6] reserved */
 115 };
 116
 117 struct mcs7830_data {
 118         u8 multi_filter[8];
 119         u8 config;
 120 };
 121
 122 static const char driver_name[] = "MOSCHIP usb-ethernet driver";
 123
 124 static int mcs7830_get_reg(struct usbnet *dev, u16 index, u16 size, void *data)
 125 {
 126         struct usb_device *xdev = dev->udev;
 127         int ret;
 128         void *buffer;
 129
 130         buffer = kmalloc(size, GFP_NOIO);
 131         if (buffer == NULL)
 132                 return -ENOMEM;
 133
 134         ret = usb_control_msg(xdev, usb_rcvctrlpipe(xdev, 0), MCS7830_RD_BREQ,
 135                               MCS7830_RD_BMREQ, 0x0000, index, buffer,
 136                               size, MCS7830_CTRL_TIMEOUT);
 137         memcpy(data, buffer, size);
 138         kfree(buffer);
 139
 140         return ret;
 141 }
 142
 143 static int mcs7830_set_reg(struct usbnet *dev, u16 index, u16 size, const void *data)
 144 {
 145         struct usb_device *xdev = dev->udev;
 146         int ret;
 147         void *buffer;
 148
 149         buffer = kmemdup(data, size, GFP_NOIO);
 150         if (buffer == NULL)
 151                 return -ENOMEM;
 152
 153         ret = usb_control_msg(xdev, usb_sndctrlpipe(xdev, 0), MCS7830_WR_BREQ,
 154                               MCS7830_WR_BMREQ, 0x0000, index, buffer,
 155                               size, MCS7830_CTRL_TIMEOUT);
 156         kfree(buffer);
 157         return ret;
 158 }
 159
 160 static void mcs7830_async_cmd_callback(struct urb *urb)
 161 {
 162         struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
 163         int status = urb->status;
 164
 165         if (status < 0)
 166                 printk(KERN_DEBUG "%s() failed with %d\n",
 167                        __func__, status);
 168
 169         kfree(req);
 170         usb_free_urb(urb);
 171 }
 172
 173 static void mcs7830_set_reg_async(struct usbnet *dev, u16 index, u16 size, void *data)
 174 {
 175         struct usb_ctrlrequest *req;
 176         int ret;
 177         struct urb *urb;
 178
 179         urb = usb_alloc_urb(0, GFP_ATOMIC);
 180         if (!urb) {
 181                 dev_dbg(&dev->udev->dev,
 182                         "Error allocating URB in write_cmd_async!\n");
 183                 return;
 184         }
 185
 186         req = kmalloc(sizeof *req, GFP_ATOMIC);
 187         if (!req) {
 188                 dev_err(&dev->udev->dev,
 189                         "Failed to allocate memory for control request\n");
 190                 goto out;
 191         }
 192         req->bRequestType = MCS7830_WR_BMREQ;
 193         req->bRequest = MCS7830_WR_BREQ;
 194         req->wValue = 0;
 195         req->wIndex = cpu_to_le16(index);
 196         req->wLength = cpu_to_le16(size);
 197
 198         usb_fill_control_urb(urb, dev->udev,
 199                              usb_sndctrlpipe(dev->udev, 0),
 200                              (void *)req, data, size,
 201                              mcs7830_async_cmd_callback, req);
 202
 203         ret = usb_submit_urb(urb, GFP_ATOMIC);
 204         if (ret < 0) {
 205                 dev_err(&dev->udev->dev,
 206                         "Error submitting the control message: ret=%d\n", ret);
 207                 goto out;
 208         }
 209         return;
 210 out:
 211         kfree(req);
 212         usb_free_urb(urb);
 213 }
 214
 215 static int mcs7830_hif_get_mac_address(struct usbnet *dev, unsigned char *addr)
 216 {
 217         int ret = mcs7830_get_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN, addr);
 218         if (ret < 0)
 219                 return ret;
 220         return 0;
 221 }
 222
 223 static int mcs7830_hif_set_mac_address(struct usbnet *dev, unsigned char *addr)
 224 {
 225         int ret = mcs7830_set_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN, addr);
 226
 227         if (ret < 0)
 228                 return ret;
 229         return 0;
 230 }
 231
 232 static int mcs7830_set_mac_address(struct net_device *netdev, void *p)
 233 {
 234         int ret;
 235         struct usbnet *dev = netdev_priv(netdev);
 236         struct sockaddr *addr = p;
 237
 238         if (netif_running(netdev))
 239                 return -EBUSY;
 240
 241         if (!is_valid_ether_addr(addr->sa_data))
 242                 return -EINVAL;
 243
 244         ret = mcs7830_hif_set_mac_address(dev, addr->sa_data);
 245
 246         if (ret < 0)
 247                 return ret;
 248
 249         /* it worked --> adopt it on netdev side */
 250         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
 251
 252         return 0;
 253 }
 254
 255 static int mcs7830_read_phy(struct usbnet *dev, u8 index)
 256 {
 257         int ret;
 258         int i;
 259         __le16 val;
 260
 261         u8 cmd[2] = {
 262                 HIF_REG_PHY_CMD1_READ | HIF_REG_PHY_CMD1_PHYADDR,
 263                 HIF_REG_PHY_CMD2_PEND_FLAG_BIT | index,
 264         };
 265
 266         mutex_lock(&dev->phy_mutex);
 267         /* write the MII command */
 268         ret = mcs7830_set_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
 269         if (ret < 0)
 270                 goto out;
 271
 272         /* wait for the data to become valid, should be within < 1ms */
 273         for (i = 0; i < 10; i++) {
 274                 ret = mcs7830_get_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
 275                 if ((ret < 0) || (cmd[1] & HIF_REG_PHY_CMD2_READY_FLAG_BIT))
 276                         break;
 277                 ret = -EIO;
 278                 msleep(1);
 279         }
 280         if (ret < 0)
 281                 goto out;
 282
 283         /* read actual register contents */
 284         ret = mcs7830_get_reg(dev, HIF_REG_PHY_DATA, 2, &val);
 285         if (ret < 0)
 286                 goto out;
 287         ret = le16_to_cpu(val);
 288         dev_dbg(&dev->udev->dev, "read PHY reg %02x: %04x (%d tries)\n",
 289                 index, val, i);
 290 out:
 291         mutex_unlock(&dev->phy_mutex);
 292         return ret;
 293 }
 294
 295 static int mcs7830_write_phy(struct usbnet *dev, u8 index, u16 val)
 296 {
 297         int ret;
 298         int i;
 299         __le16 le_val;
 300
 301         u8 cmd[2] = {
 302                 HIF_REG_PHY_CMD1_WRITE | HIF_REG_PHY_CMD1_PHYADDR,
 303                 HIF_REG_PHY_CMD2_PEND_FLAG_BIT | (index & 0x1F),
 304         };
 305
 306         mutex_lock(&dev->phy_mutex);
 307
 308         /* write the new register contents */
 309         le_val = cpu_to_le16(val);
 310         ret = mcs7830_set_reg(dev, HIF_REG_PHY_DATA, 2, &le_val);
 311         if (ret < 0)
 312                 goto out;
 313
 314         /* write the MII command */
 315         ret = mcs7830_set_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
 316         if (ret < 0)
 317                 goto out;
 318
 319         /* wait for the command to be accepted by the PHY */
 320         for (i = 0; i < 10; i++) {
 321                 ret = mcs7830_get_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
 322                 if ((ret < 0) || (cmd[1] & HIF_REG_PHY_CMD2_READY_FLAG_BIT))
 323                         break;
 324                 ret = -EIO;
 325                 msleep(1);
 326         }
 327         if (ret < 0)
 328                 goto out;
 329
 330         ret = 0;
 331         dev_dbg(&dev->udev->dev, "write PHY reg %02x: %04x (%d tries)\n",
 332                 index, val, i);
 333 out:
 334         mutex_unlock(&dev->phy_mutex);
 335         return ret;
 336 }
 337
 338 /*
 339  * This algorithm comes from the original mcs7830 version 1.4 driver,
 340  * not sure if it is needed.
 341  */
 342 static int mcs7830_set_autoneg(struct usbnet *dev, int ptrUserPhyMode)
 343 {
 344         int ret;
 345         /* Enable all media types */
 346         ret = mcs7830_write_phy(dev, MII_ADVERTISE, MCS7830_MII_ADVERTISE);
 347
 348         /* First reset BMCR */
 349         if (!ret)
 350                 ret = mcs7830_write_phy(dev, MII_BMCR, 0x0000);
 351         /* Enable Auto Neg */
 352         if (!ret)
 353                 ret = mcs7830_write_phy(dev, MII_BMCR, BMCR_ANENABLE);
 354         /* Restart Auto Neg (Keep the Enable Auto Neg Bit Set) */
 355         if (!ret)
 356                 ret = mcs7830_write_phy(dev, MII_BMCR,
 357                                 BMCR_ANENABLE | BMCR_ANRESTART  );
 358         return ret;
 359 }
 360
 361
 362 /*
 363  * if we can read register 22, the chip revision is C or higher
 364  */
 365 static int mcs7830_get_rev(struct usbnet *dev)
 366 {
 367         u8 dummy[2];
 368         int ret;
 369         ret = mcs7830_get_reg(dev, HIF_REG_FRAME_DROP_COUNTER, 2, dummy);
 370         if (ret > 0)
 371                 return 2; /* Rev C or later */
 372         return 1; /* earlier revision */
 373 }
 374
 375 /*
 376  * On rev. C we need to set the pause threshold
 377  */
 378 static void mcs7830_rev_C_fixup(struct usbnet *dev)
 379 {
 380         u8 pause_threshold = HIF_REG_PAUSE_THRESHOLD_DEFAULT;
 381         int retry;
 382
 383         for (retry = 0; retry < 2; retry++) {
 384                 if (mcs7830_get_rev(dev) == 2) {
 385                         dev_info(&dev->udev->dev, "applying rev.C fixup\n");
 386                         mcs7830_set_reg(dev, HIF_REG_PAUSE_THRESHOLD,
 387                                         1, &pause_threshold);
 388                 }
 389                 msleep(1);
 390         }
 391 }
 392
 393 static int mcs7830_mdio_read(struct net_device *netdev, int phy_id,
 394                              int location)
 395 {
 396         struct usbnet *dev = netdev_priv(netdev);
 397         return mcs7830_read_phy(dev, location);
 398 }
 399
 400 static void mcs7830_mdio_write(struct net_device *netdev, int phy_id,
 401                                 int location, int val)
 402 {
 403         struct usbnet *dev = netdev_priv(netdev);
 404         mcs7830_write_phy(dev, location, val);
 405 }
 406
 407 static int mcs7830_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
 408 {
 409         struct usbnet *dev = netdev_priv(net);
 410         return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
 411 }
 412
 413 static inline struct mcs7830_data *mcs7830_get_data(struct usbnet *dev)
 414 {
 415         return (struct mcs7830_data *)&dev->data;
 416 }
 417
 418 static void mcs7830_hif_update_multicast_hash(struct usbnet *dev)
 419 {
 420         struct mcs7830_data *data = mcs7830_get_data(dev);
 421         mcs7830_set_reg_async(dev, HIF_REG_MULTICAST_HASH,
 422                                 sizeof data->multi_filter,
 423                                 data->multi_filter);
 424 }
 425
 426 static void mcs7830_hif_update_config(struct usbnet *dev)
 427 {
 428         /* implementation specific to data->config
 429            (argument needs to be heap-based anyway - USB DMA!) */
 430         struct mcs7830_data *data = mcs7830_get_data(dev);
 431         mcs7830_set_reg_async(dev, HIF_REG_CONFIG, 1, &data->config);
 432 }
 433
 434 static void mcs7830_data_set_multicast(struct net_device *net)
 435 {
 436         struct usbnet *dev = netdev_priv(net);
 437         struct mcs7830_data *data = mcs7830_get_data(dev);
 438
 439         memset(data->multi_filter, 0, sizeof data->multi_filter);
 440
 441         data->config = HIF_REG_CONFIG_TXENABLE;
 442
 443         /* this should not be needed, but it doesn't work otherwise */
 444         data->config |= HIF_REG_CONFIG_ALLMULTICAST;
 445
 446         if (net->flags & IFF_PROMISC) {
 447                 data->config |= HIF_REG_CONFIG_PROMISCUOUS;
 448         } else if (net->flags & IFF_ALLMULTI ||
 449                    netdev_mc_count(net) > MCS7830_MAX_MCAST) {
 450                 data->config |= HIF_REG_CONFIG_ALLMULTICAST;
 451         } else if (netdev_mc_empty(net)) {
 452                 /* just broadcast and directed */
 453         } else {
 454                 /* We use the 20 byte dev->data
 455                  * for our 8 byte filter buffer
 456                  * to avoid allocating memory that
 457                  * is tricky to free later */
 458                 struct netdev_hw_addr *ha;
 459                 u32 crc_bits;
 460
 461                 /* Build the multicast hash filter. */
 462                 netdev_for_each_mc_addr(ha, net) {
 463                         crc_bits = ether_crc(ETH_ALEN, ha->addr) >> 26;
 464                         data->multi_filter[crc_bits >> 3] |= 1 << (crc_bits & 7);
 465                 }
 466         }
 467 }
 468
 469 static int mcs7830_apply_base_config(struct usbnet *dev)
 470 {
 471         int ret;
 472
 473         /* re-configure known MAC (suspend case etc.) */
 474         ret = mcs7830_hif_set_mac_address(dev, dev->net->dev_addr);
 475         if (ret) {
 476                 dev_info(&dev->udev->dev, "Cannot set MAC address\n");
 477                 goto out;
 478         }
 479
 480         /* Set up PHY */
 481         ret = mcs7830_set_autoneg(dev, 0);
 482         if (ret) {
 483                 dev_info(&dev->udev->dev, "Cannot set autoneg\n");
 484                 goto out;
 485         }
 486
 487         mcs7830_hif_update_multicast_hash(dev);
 488         mcs7830_hif_update_config(dev);
 489
 490         mcs7830_rev_C_fixup(dev);
 491         ret = 0;
 492 out:
 493         return ret;
 494 }
 495
 496 /* credits go to asix_set_multicast */
 497 static void mcs7830_set_multicast(struct net_device *net)
 498 {
 499         struct usbnet *dev = netdev_priv(net);
 500
 501         mcs7830_data_set_multicast(net);
 502
 503         mcs7830_hif_update_multicast_hash(dev);
 504         mcs7830_hif_update_config(dev);
 505 }
 506
 507 static int mcs7830_get_regs_len(struct net_device *net)
 508 {
 509         struct usbnet *dev = netdev_priv(net);
 510
 511         switch (mcs7830_get_rev(dev)) {
 512         case 1:
 513                 return 21;
 514         case 2:
 515                 return 32;
 516         }
 517         return 0;
 518 }
 519
 520 static void mcs7830_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *drvinfo)
 521 {
 522         usbnet_get_drvinfo(net, drvinfo);
 523         drvinfo->regdump_len = mcs7830_get_regs_len(net);
 524 }
 525
 526 static void mcs7830_get_regs(struct net_device *net, struct ethtool_regs *regs, void *data)
 527 {
 528         struct usbnet *dev = netdev_priv(net);
 529
 530         regs->version = mcs7830_get_rev(dev);
 531         mcs7830_get_reg(dev, 0, regs->len, data);
 532 }
 533
 534 static const struct ethtool_ops mcs7830_ethtool_ops = {
 535         .get_drvinfo            = mcs7830_get_drvinfo,
 536         .get_regs_len           = mcs7830_get_regs_len,
 537         .get_regs               = mcs7830_get_regs,
 538
 539         /* common usbnet calls */
 540         .get_link               = usbnet_get_link,
 541         .get_msglevel           = usbnet_get_msglevel,
 542         .set_msglevel           = usbnet_set_msglevel,
 543         .get_settings           = usbnet_get_settings,
 544         .set_settings           = usbnet_set_settings,
 545         .nway_reset             = usbnet_nway_reset,
 546 };
 547
 548 static const struct net_device_ops mcs7830_netdev_ops = {
 549         .ndo_open               = usbnet_open,
 550         .ndo_stop               = usbnet_stop,
 551         .ndo_start_xmit         = usbnet_start_xmit,
 552         .ndo_tx_timeout         = usbnet_tx_timeout,
 553         .ndo_change_mtu         = usbnet_change_mtu,
 554         .ndo_validate_addr      = eth_validate_addr,
 555         .ndo_do_ioctl           = mcs7830_ioctl,
 556         .ndo_set_rx_mode        = mcs7830_set_multicast,
 557         .ndo_set_mac_address    = mcs7830_set_mac_address,
 558 };
 559
 560 static int mcs7830_bind(struct usbnet *dev, struct usb_interface *udev)
 561 {
 562         struct net_device *net = dev->net;
 563         int ret;
 564         int retry;
 565
 566         /* Initial startup: Gather MAC address setting from EEPROM */
 567         ret = -EINVAL;
 568         for (retry = 0; retry < 5 && ret; retry++)
 569                 ret = mcs7830_hif_get_mac_address(dev, net->dev_addr);
 570         if (ret) {
 571                 dev_warn(&dev->udev->dev, "Cannot read MAC address\n");
 572                 goto out;
 573         }
 574
 575         mcs7830_data_set_multicast(net);
 576
 577         ret = mcs7830_apply_base_config(dev);
 578         if (ret)
 579                 goto out;
 580
 581         net->ethtool_ops = &mcs7830_ethtool_ops;
 582         net->netdev_ops = &mcs7830_netdev_ops;
 583
 584         /* reserve space for the status byte on rx */
 585         dev->rx_urb_size = ETH_FRAME_LEN + 1;
 586
 587         dev->mii.mdio_read = mcs7830_mdio_read;
 588         dev->mii.mdio_write = mcs7830_mdio_write;
 589         dev->mii.dev = net;
 590         dev->mii.phy_id_mask = 0x3f;
 591         dev->mii.reg_num_mask = 0x1f;
 592         dev->mii.phy_id = *((u8 *) net->dev_addr + 1);
 593
 594         ret = usbnet_get_endpoints(dev, udev);
 595 out:
 596         return ret;
 597 }
 598
 599 /* The chip always appends a status byte that we need to strip */
 600 static int mcs7830_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
 601 {
 602         u8 status;
 603
 604         if (skb->len == 0) {
 605                 dev_err(&dev->udev->dev, "unexpected empty rx frame\n");
 606                 return 0;
 607         }
 608
 609         skb_trim(skb, skb->len - 1);
 610         status = skb->data[skb->len];
 611
 612         if (status != MCS7830_RX_FRAME_CORRECT) {
 613                 dev_dbg(&dev->udev->dev, "rx fixup status %x\n", status);
 614
 615                 /* hmm, perhaps usbnet.c already sees a globally visible
 616                    frame error and increments rx_errors on its own already? */
 617                 dev->net->stats.rx_errors++;
 618
 619                 if (status &    (MCS7830_RX_SHORT_FRAME
 620                                 |MCS7830_RX_LENGTH_ERROR
 621                                 |MCS7830_RX_LARGE_FRAME))
 622                         dev->net->stats.rx_length_errors++;
 623                 if (status & MCS7830_RX_ALIGNMENT_ERROR)
 624                         dev->net->stats.rx_frame_errors++;
 625                 if (status & MCS7830_RX_CRC_ERROR)
 626                         dev->net->stats.rx_crc_errors++;
 627         }
 628
 629         return skb->len > 0;
 630 }
 631
 632 static const struct driver_info moschip_info = {
 633         .description    = "MOSCHIP 7830/7832/7730 usb-NET adapter",
 634         .bind           = mcs7830_bind,
 635         .rx_fixup       = mcs7830_rx_fixup,
 636         .flags          = FLAG_ETHER,
 637         .in             = 1,
 638         .out            = 2,
 639 };
 640
 641 static const struct driver_info sitecom_info = {
 642         .description    = "Sitecom LN-30 usb-NET adapter",
 643         .bind           = mcs7830_bind,
 644         .rx_fixup       = mcs7830_rx_fixup,
 645         .flags          = FLAG_ETHER,
 646         .in             = 1,
 647         .out            = 2,
 648 };
 649
 650 static const struct usb_device_id products[] = {
 651         {
 652                 USB_DEVICE(MCS7830_VENDOR_ID, MCS7832_PRODUCT_ID),
 653                 .driver_info = (unsigned long) &moschip_info,
 654         },
 655         {
 656                 USB_DEVICE(MCS7830_VENDOR_ID, MCS7830_PRODUCT_ID),
 657                 .driver_info = (unsigned long) &moschip_info,
 658         },
 659         {
 660                 USB_DEVICE(MCS7830_VENDOR_ID, MCS7730_PRODUCT_ID),
 661                 .driver_info = (unsigned long) &moschip_info,
 662         },
 663         {
 664                 USB_DEVICE(SITECOM_VENDOR_ID, LN_030_PRODUCT_ID),
 665                 .driver_info = (unsigned long) &sitecom_info,
 666         },
 667         {},
 668 };
 669 MODULE_DEVICE_TABLE(usb, products);
 670
 671 static int mcs7830_reset_resume (struct usb_interface *intf)
 672 {
 673         /* YES, this function is successful enough that ethtool -d
 674            does show same output pre-/post-suspend */
 675
 676         struct usbnet           *dev = usb_get_intfdata(intf);
 677
 678         mcs7830_apply_base_config(dev);
 679
 680         usbnet_resume(intf);
 681
 682         return 0;
 683 }
 684
 685 static struct usb_driver mcs7830_driver = {
 686         .name = driver_name,
 687         .id_table = products,
 688         .probe = usbnet_probe,
 689         .disconnect = usbnet_disconnect,
 690         .suspend = usbnet_suspend,
 691         .resume = usbnet_resume,
 692         .reset_resume = mcs7830_reset_resume,
 693 };
 694
 695 static int __init mcs7830_init(void)
 696 {
 697         return usb_register(&mcs7830_driver);
 698 }
 699 module_init(mcs7830_init);
 700
 701 static void __exit mcs7830_exit(void)
 702 {
 703         usb_deregister(&mcs7830_driver);
 704 }
 705 module_exit(mcs7830_exit);
 706
 707 MODULE_DESCRIPTION("USB to network adapter MCS7830)");
 708 MODULE_LICENSE("GPL");