drivers/net/usb/mcs7830.c

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