text: // SPDX-License-Identifier: GPL-2.0-or-later
   /***************************************************************************
   *
   * Copyright (C) 2007-2008 SMSC
   *
   *****************************************************************************/
  
  #include <linux/module.h>
  #include <linux/kmod.h>
  #include <linux/netdevice.h>
  #include <linux/etherdevice.h>
  #include <linux/ethtool.h>
  #include <linux/mii.h>
  #include <linux/usb.h>
  #include <linux/bitrev.h>
  #include <linux/crc16.h>
  #include <linux/crc32.h>
  #include <linux/usb/usbnet.h>
  #include <linux/slab.h>
  #include <linux/of_net.h>
  #include "smsc95xx.h"
  
  #define SMSC_CHIPNAME			"smsc95xx"
  #define SMSC_DRIVER_VERSION		"1.0.6"
  #define HS_USB_PKT_SIZE			(512)
  #define FS_USB_PKT_SIZE			(64)
  #define DEFAULT_HS_BURST_CAP_SIZE	(16 * 1024 + 5 * HS_USB_PKT_SIZE)
  #define DEFAULT_FS_BURST_CAP_SIZE	(6 * 1024 + 33 * FS_USB_PKT_SIZE)
  #define DEFAULT_BULK_IN_DELAY		(0x00002000)
  #define MAX_SINGLE_PACKET_SIZE		(2048)
  #define LAN95XX_EEPROM_MAGIC		(0x9500)
  #define EEPROM_MAC_OFFSET		(0x01)
  #define DEFAULT_TX_CSUM_ENABLE		(true)
  #define DEFAULT_RX_CSUM_ENABLE		(true)
  #define SMSC95XX_INTERNAL_PHY_ID	(1)
  #define SMSC95XX_TX_OVERHEAD		(8)
  #define SMSC95XX_TX_OVERHEAD_CSUM	(12)
  #define SUPPORTED_WAKE			(WAKE_PHY | WAKE_UCAST | WAKE_BCAST | \
  					 WAKE_MCAST | WAKE_ARP | WAKE_MAGIC)
  
  #define FEATURE_8_WAKEUP_FILTERS	(0x01)
  #define FEATURE_PHY_NLP_CROSSOVER	(0x02)
  #define FEATURE_REMOTE_WAKEUP		(0x04)
  
  #define SUSPEND_SUSPEND0		(0x01)
  #define SUSPEND_SUSPEND1		(0x02)
  #define SUSPEND_SUSPEND2		(0x04)
  #define SUSPEND_SUSPEND3		(0x08)
  #define SUSPEND_ALLMODES		(SUSPEND_SUSPEND0 | SUSPEND_SUSPEND1 | \
  					 SUSPEND_SUSPEND2 | SUSPEND_SUSPEND3)
  
  #define CARRIER_CHECK_DELAY (2 * HZ)
  
  struct smsc95xx_priv {
  	u32 chip_id;
  	u32 mac_cr;
  	u32 hash_hi;
  	u32 hash_lo;
  	u32 wolopts;
  	spinlock_t mac_cr_lock;
  	u8 features;
  	u8 suspend_flags;
  	u8 mdix_ctrl;
  	bool link_ok;
  	struct delayed_work carrier_check;
  	struct usbnet *dev;
  };
  
  static bool turbo_mode = true;
  module_param(turbo_mode, bool, 0644);
  MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
  
  static int __must_check __smsc95xx_read_reg(struct usbnet *dev, u32 index,
  					    u32 *data, int in_pm)
  {
  	u32 buf;
  	int ret;
  	int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
  
  	BUG_ON(!dev);
  
  	if (!in_pm)
  		fn = usbnet_read_cmd;
  	else
  		fn = usbnet_read_cmd_nopm;
  
  	ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
  		 | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  		 0, index, &buf, 4);
  	if (unlikely(ret < 0)) {
  		netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
  			    index, ret);
  		return ret;
  	}
  
  	le32_to_cpus(&buf);
  	*data = buf;
  
  	return ret;
  }
  
  static int __must_check __smsc95xx_write_reg(struct usbnet *dev, u32 index,
  					     u32 data, int in_pm)
  {
  	u32 buf;
  	int ret;
  	int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
  
  	BUG_ON(!dev);
  
  	if (!in_pm)
  		fn = usbnet_write_cmd;
  	else
  		fn = usbnet_write_cmd_nopm;
  
  	buf = data;
  	cpu_to_le32s(&buf);
  
  	ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
  		 | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  		 0, index, &buf, 4);
  	if (unlikely(ret < 0))
  		netdev_warn(dev->net, "Failed to write reg index 0x%08x: %d\n",
  			    index, ret);
  
  	return ret;
  }
  
  static int __must_check smsc95xx_read_reg_nopm(struct usbnet *dev, u32 index,
  					       u32 *data)
  {
  	return __smsc95xx_read_reg(dev, index, data, 1);
  }
  
  static int __must_check smsc95xx_write_reg_nopm(struct usbnet *dev, u32 index,
  						u32 data)
  {
  	return __smsc95xx_write_reg(dev, index, data, 1);
  }
  
  static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
  					  u32 *data)
  {
  	return __smsc95xx_read_reg(dev, index, data, 0);
  }
  
  static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
  					   u32 data)
  {
  	return __smsc95xx_write_reg(dev, index, data, 0);
  }
  
  /* Loop until the read is completed with timeout
   * called with phy_mutex held */
  static int __must_check __smsc95xx_phy_wait_not_busy(struct usbnet *dev,
  						     int in_pm)
  {
  	unsigned long start_time = jiffies;
  	u32 val;
  	int ret;
  
  	do {
  		ret = __smsc95xx_read_reg(dev, MII_ADDR, &val, in_pm);
  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading MII_ACCESS\n");
  			return ret;
  		}
  
  		if (!(val & MII_BUSY_))
  			return 0;
  	} while (!time_after(jiffies, start_time + HZ));
  
  	return -EIO;
  }
  
  static int __smsc95xx_mdio_read(struct net_device *netdev, int phy_id, int idx,
  				int in_pm)
  {
  	struct usbnet *dev = netdev_priv(netdev);
  	u32 val, addr;
  	int ret;
  
  	mutex_lock(&dev->phy_mutex);
  
  	/* confirm MII not busy */
  	ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
  	if (ret < 0) {
  		netdev_warn(dev->net, "MII is busy in smsc95xx_mdio_read\n");
  		goto done;
  	}
  
  	/* set the address, index & direction (read from PHY) */
  	phy_id &= dev->mii.phy_id_mask;
  	idx &= dev->mii.reg_num_mask;
  	addr = (phy_id << 11) | (idx << 6) | MII_READ_ | MII_BUSY_;
  	ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing MII_ADDR\n");
  		goto done;
  	}
  
  	ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
  	if (ret < 0) {
  		netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
  		goto done;
  	}
  
  	ret = __smsc95xx_read_reg(dev, MII_DATA, &val, in_pm);
  	if (ret < 0) {
  		netdev_warn(dev->net, "Error reading MII_DATA\n");
  		goto done;
  	}
  
  	ret = (u16)(val & 0xFFFF);
  
  done:
  	mutex_unlock(&dev->phy_mutex);
  	return ret;
  }
  
  static void __smsc95xx_mdio_write(struct net_device *netdev, int phy_id,
  				  int idx, int regval, int in_pm)
  {
  	struct usbnet *dev = netdev_priv(netdev);
  	u32 val, addr;
  	int ret;
  
  	mutex_lock(&dev->phy_mutex);
  
  	/* confirm MII not busy */
  	ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
  	if (ret < 0) {
  		netdev_warn(dev->net, "MII is busy in smsc95xx_mdio_write\n");
  		goto done;
  	}
  
  	val = regval;
  	ret = __smsc95xx_write_reg(dev, MII_DATA, val, in_pm);
  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing MII_DATA\n");
  		goto done;
  	}
  
  	/* set the address, index & direction (write to PHY) */
  	phy_id &= dev->mii.phy_id_mask;
  	idx &= dev->mii.reg_num_mask;
  	addr = (phy_id << 11) | (idx << 6) | MII_WRITE_ | MII_BUSY_;
  	ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing MII_ADDR\n");
  		goto done;
  	}
  
  	ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
  	if (ret < 0) {
  		netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
  		goto done;
  	}
  
  done:
  	mutex_unlock(&dev->phy_mutex);
  }
  
  static int smsc95xx_mdio_read_nopm(struct net_device *netdev, int phy_id,
  				   int idx)
  {
  	return __smsc95xx_mdio_read(netdev, phy_id, idx, 1);
  }
  
  static void smsc95xx_mdio_write_nopm(struct net_device *netdev, int phy_id,
  				     int idx, int regval)
  {
  	__smsc95xx_mdio_write(netdev, phy_id, idx, regval, 1);
  }
  
  static int smsc95xx_mdio_read(struct net_device *netdev, int phy_id, int idx)
  {
  	return __smsc95xx_mdio_read(netdev, phy_id, idx, 0);
  }
  
  static void smsc95xx_mdio_write(struct net_device *netdev, int phy_id, int idx,
  				int regval)
  {
  	__smsc95xx_mdio_write(netdev, phy_id, idx, regval, 0);
  }
  
  static int __must_check smsc95xx_wait_eeprom(struct usbnet *dev)
  {
  	unsigned long start_time = jiffies;
  	u32 val;
  	int ret;
  
  	do {
  		ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading E2P_CMD\n");
  			return ret;
  		}
  
  		if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
  			break;
  		udelay(40);
  	} while (!time_after(jiffies, start_time + HZ));
  
  	if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
  		netdev_warn(dev->net, "EEPROM read operation timeout\n");
  		return -EIO;
  	}
  
  	return 0;
  }
  
  static int __must_check smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
  {
  	unsigned long start_time = jiffies;
  	u32 val;
  	int ret;
  
  	do {
  		ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading E2P_CMD\n");
  			return ret;
  		}
  
  		if (!(val & E2P_CMD_BUSY_))
  			return 0;
  
  		udelay(40);
  	} while (!time_after(jiffies, start_time + HZ));
  
  	netdev_warn(dev->net, "EEPROM is busy\n");
  	return -EIO;
  }
  
  static int smsc95xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
  				u8 *data)
  {
  	u32 val;
  	int i, ret;
  
  	BUG_ON(!dev);
  	BUG_ON(!data);
  
  	ret = smsc95xx_eeprom_confirm_not_busy(dev);
  	if (ret)
  		return ret;
  
  	for (i = 0; i < length; i++) {
  		val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
  		ret = smsc95xx_write_reg(dev, E2P_CMD, val);
  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing E2P_CMD\n");
  			return ret;
  		}
  
  		ret = smsc95xx_wait_eeprom(dev);
  		if (ret < 0)
  			return ret;
  
  		ret = smsc95xx_read_reg(dev, E2P_DATA, &val);
  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading E2P_DATA\n");
  			return ret;
  		}
  
  		data[i] = val & 0xFF;
  		offset++;
  	}
  
  	return 0;
  }
  
  static int smsc95xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
  				 u8 *data)
  {
  	u32 val;
  	int i, ret;
  
  	BUG_ON(!dev);
  	BUG_ON(!data);
  
  	ret = smsc95xx_eeprom_confirm_not_busy(dev);
  	if (ret)
  		return ret;
  
  	/* Issue write/erase enable command */
  	val = E2P_CMD_BUSY_ | E2P_CMD_EWEN_;
  	ret = smsc95xx_write_reg(dev, E2P_CMD, val);
  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing E2P_DATA\n");
  		return ret;
  	}
  
  	ret = smsc95xx_wait_eeprom(dev);
  	if (ret < 0)
  		return ret;
  
  	for (i = 0; i < length; i++) {
  
  		/* Fill data register */
  		val = data[i];
  		ret = smsc95xx_write_reg(dev, E2P_DATA, val);
  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing E2P_DATA\n");
  			return ret;
  		}
  
  		/* Send "write" command */
  		val = E2P_CMD_BUSY_ | E2P_CMD_WRITE_ | (offset & E2P_CMD_ADDR_);
  		ret = smsc95xx_write_reg(dev, E2P_CMD, val);
  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing E2P_CMD\n");
  			return ret;
  		}
  
  		ret = smsc95xx_wait_eeprom(dev);
  		if (ret < 0)
  			return ret;
  
  		offset++;
  	}
  
  	return 0;
  }
  
  static int __must_check smsc95xx_write_reg_async(struct usbnet *dev, u16 index,
  						 u32 data)
  {
  	const u16 size = 4;
  	u32 buf;
  	int ret;
  
  	buf = data;
  	cpu_to_le32s(&buf);
  
  	ret = usbnet_write_cmd_async(dev, USB_VENDOR_REQUEST_WRITE_REGISTER,
  				     USB_DIR_OUT | USB_TYPE_VENDOR |
  				     USB_RECIP_DEVICE,
  				     0, index, &buf, size);
  	if (ret < 0)
  		netdev_warn(dev->net, "Error write async cmd, sts=%d\n",
  			    ret);
  	return ret;
  }
  
  /* returns hash bit number for given MAC address
   * example:
   * 01 00 5E 00 00 01 -> returns bit number 31 */
  static unsigned int smsc95xx_hash(char addr[ETH_ALEN])
  {
  	return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
  }
  
  static void smsc95xx_set_multicast(struct net_device *netdev)
  {
  	struct usbnet *dev = netdev_priv(netdev);
  	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
  	unsigned long flags;
  	int ret;
  
  	pdata->hash_hi = 0;
  	pdata->hash_lo = 0;
  
  	spin_lock_irqsave(&pdata->mac_cr_lock, flags);
  
  	if (dev->net->flags & IFF_PROMISC) {
  		netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
  		pdata->mac_cr |= MAC_CR_PRMS_;
  		pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
  	} else if (dev->net->flags & IFF_ALLMULTI) {
  		netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
  		pdata->mac_cr |= MAC_CR_MCPAS_;
  		pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
  	} else if (!netdev_mc_empty(dev->net)) {
  		struct netdev_hw_addr *ha;
  
  		pdata->mac_cr |= MAC_CR_HPFILT_;
  		pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
  
  		netdev_for_each_mc_addr(ha, netdev) {
  			u32 bitnum = smsc95xx_hash(ha->addr);
  			u32 mask = 0x01 << (bitnum & 0x1F);
  			if (bitnum & 0x20)
  				pdata->hash_hi |= mask;
  			else
  				pdata->hash_lo |= mask;
  		}
  
  		netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
  				   pdata->hash_hi, pdata->hash_lo);
  	} else {
  		netif_dbg(dev, drv, dev->net, "receive own packets only\n");
  		pdata->mac_cr &=
  			~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
  	}
  
  	spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
  
  	/* Initiate async writes, as we can't wait for completion here */
  	ret = smsc95xx_write_reg_async(dev, HASHH, pdata->hash_hi);
  	if (ret < 0)
  		netdev_warn(dev->net, "failed to initiate async write to HASHH\n");
  
  	ret = smsc95xx_write_reg_async(dev, HASHL, pdata->hash_lo);
  	if (ret < 0)
  		netdev_warn(dev->net, "failed to initiate async write to HASHL\n");
  
  	ret = smsc95xx_write_reg_async(dev, MAC_CR, pdata->mac_cr);
  	if (ret < 0)
  		netdev_warn(dev->net, "failed to initiate async write to MAC_CR\n");
  }
  
  static int smsc95xx_phy_update_flowcontrol(struct usbnet *dev, u8 duplex,
  					   u16 lcladv, u16 rmtadv)
  {
  	u32 flow = 0, afc_cfg;
  
  	int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
  	if (ret < 0)
  		return ret;
  
  	if (duplex == DUPLEX_FULL) {
  		u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
  
  		if (cap & FLOW_CTRL_RX)
  			flow = 0xFFFF0002;
  
  		if (cap & FLOW_CTRL_TX) {
  			afc_cfg |= 0xF;
  			flow |= 0xFFFF0000;
  		} else {
  			afc_cfg &= ~0xF;
  		}
  
  		netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
  				   cap & FLOW_CTRL_RX ? "enabled" : "disabled",
  				   cap & FLOW_CTRL_TX ? "enabled" : "disabled");
  	} else {
  		netif_dbg(dev, link, dev->net, "half duplex\n");
  		afc_cfg |= 0xF;
  	}
  
  	ret = smsc95xx_write_reg(dev, FLOW, flow);
  	if (ret < 0)
  		return ret;
  
  	return smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
  }
  
  static int smsc95xx_link_reset(struct usbnet *dev)
  {
  	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
  	struct mii_if_info *mii = &dev->mii;
  	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
  	unsigned long flags;
  	u16 lcladv, rmtadv;
  	int ret;
  
  	/* clear interrupt status */
  	ret = smsc95xx_mdio_read(dev->net, mii->phy_id, PHY_INT_SRC);
  	if (ret < 0)
  		return ret;
  
  	ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
  	if (ret < 0)
  		return ret;
  
  	mii_check_media(mii, 1, 1);
  	mii_ethtool_gset(&dev->mii, &ecmd);
  	lcladv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_ADVERTISE);
  	rmtadv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_LPA);
  
  	netif_dbg(dev, link, dev->net,
  		  "speed: %u duplex: %d lcladv: %04x rmtadv: %04x\n",
  		  ethtool_cmd_speed(&ecmd), ecmd.duplex, lcladv, rmtadv);
  
  	spin_lock_irqsave(&pdata->mac_cr_lock, flags);
  	if (ecmd.duplex != DUPLEX_FULL) {
  		pdata->mac_cr &= ~MAC_CR_FDPX_;
  		pdata->mac_cr |= MAC_CR_RCVOWN_;
  	} else {
  		pdata->mac_cr &= ~MAC_CR_RCVOWN_;
  		pdata->mac_cr |= MAC_CR_FDPX_;
  	}
  	spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
  
  	ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
  	if (ret < 0)
  		return ret;
  
  	ret = smsc95xx_phy_update_flowcontrol(dev, ecmd.duplex, lcladv, rmtadv);
  	if (ret < 0)
  		netdev_warn(dev->net, "Error updating PHY flow control\n");
  
  	return ret;
  }
  
  static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
  {
  	u32 intdata;
  
  	if (urb->actual_length != 4) {
  		netdev_warn(dev->net, "unexpected urb length %d\n",
  			    urb->actual_length);
  		return;
  	}
  
  	intdata = get_unaligned_le32(urb->transfer_buffer);
  	netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
  
  	if (intdata & INT_ENP_PHY_INT_)
  		usbnet_defer_kevent(dev, EVENT_LINK_RESET);
  	else
  		netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
  			    intdata);
  }
  
  static void set_carrier(struct usbnet *dev, bool link)
  {
  	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
  
  	if (pdata->link_ok == link)
  		return;
  
  	pdata->link_ok = link;
  
  	if (link)
  		usbnet_link_change(dev, 1, 0);
  	else
  		usbnet_link_change(dev, 0, 0);
  }
  
  static void check_carrier(struct work_struct *work)
  {
  	struct smsc95xx_priv *pdata = container_of(work, struct smsc95xx_priv,
  						carrier_check.work);
  	struct usbnet *dev = pdata->dev;
  	int ret;
  
  	if (pdata->suspend_flags != 0)
  		return;
  
  	ret = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, MII_BMSR);
  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read MII_BMSR\n");
  		return;
  	}
  	if (ret & BMSR_LSTATUS)
  		set_carrier(dev, 1);
  	else
  		set_carrier(dev, 0);
  
  	schedule_delayed_work(&pdata->carrier_check, CARRIER_CHECK_DELAY);
  }
  
  /* Enable or disable Tx & Rx checksum offload engines */
  static int smsc95xx_set_features(struct net_device *netdev,
  	netdev_features_t features)
  {
  	struct usbnet *dev = netdev_priv(netdev);
  	u32 read_buf;
  	int ret;
  
  	ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
  	if (ret < 0)
  		return ret;
  
  	if (features & NETIF_F_IP_CSUM)
  		read_buf |= Tx_COE_EN_;
  	else
  		read_buf &= ~Tx_COE_EN_;
  
  	if (features & NETIF_F_RXCSUM)
  		read_buf |= Rx_COE_EN_;
  	else
  		read_buf &= ~Rx_COE_EN_;
  
  	ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
  	if (ret < 0)
  		return ret;
  
  	netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
  	return 0;
  }
  
  static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
  {
  	return MAX_EEPROM_SIZE;
  }
  
  static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
  				       struct ethtool_eeprom *ee, u8 *data)
  {
  	struct usbnet *dev = netdev_priv(netdev);
  
  	ee->magic = LAN95XX_EEPROM_MAGIC;
  
  	return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
  }
  
  static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
  				       struct ethtool_eeprom *ee, u8 *data)
  {
  	struct usbnet *dev = netdev_priv(netdev);
  
  	if (ee->magic != LAN95XX_EEPROM_MAGIC) {
  		netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
  			    ee->magic);
  		return -EINVAL;
  	}
  
  	return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
  }
  
  static int smsc95xx_ethtool_getregslen(struct net_device *netdev)
  {
  	/* all smsc95xx registers */
  	return COE_CR - ID_REV + sizeof(u32);
  }
  
  static void
  smsc95xx_ethtool_getregs(struct net_device *netdev, struct ethtool_regs *regs,
  			 void *buf)
  {
  	struct usbnet *dev = netdev_priv(netdev);
  	unsigned int i, j;
  	int retval;
  	u32 *data = buf;
  
  	retval = smsc95xx_read_reg(dev, ID_REV, &regs->version);
  	if (retval < 0) {
  		netdev_warn(netdev, "REGS: cannot read ID_REV\n");
  		return;
  	}
  
  	for (i = ID_REV, j = 0; i <= COE_CR; i += (sizeof(u32)), j++) {
  		retval = smsc95xx_read_reg(dev, i, &data[j]);
  		if (retval < 0) {
  			netdev_warn(netdev, "REGS: cannot read reg[%x]\n", i);
  			return;
  		}
  	}
  }
  
  static void smsc95xx_ethtool_get_wol(struct net_device *net,
  				     struct ethtool_wolinfo *wolinfo)
  {
  	struct usbnet *dev = netdev_priv(net);
  	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
  
  	wolinfo->supported = SUPPORTED_WAKE;
  	wolinfo->wolopts = pdata->wolopts;
  }
  
  static int smsc95xx_ethtool_set_wol(struct net_device *net,
  				    struct ethtool_wolinfo *wolinfo)
  {
  	struct usbnet *dev = netdev_priv(net);
  	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
  	int ret;
  
  	if (wolinfo->wolopts & ~SUPPORTED_WAKE)
  		return -EINVAL;
  
  	pdata->wolopts = wolinfo->wolopts & SUPPORTED_WAKE;
  
  	ret = device_set_wakeup_enable(&dev->udev->dev, pdata->wolopts);
  	if (ret < 0)
  		netdev_warn(dev->net, "device_set_wakeup_enable error %d\n", ret);
  
  	return ret;
  }
  
  static int get_mdix_status(struct net_device *net)
  {
  	struct usbnet *dev = netdev_priv(net);
  	u32 val;
  	int buf;
  
  	buf = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, SPECIAL_CTRL_STS);
  	if (buf & SPECIAL_CTRL_STS_OVRRD_AMDIX_) {
  		if (buf & SPECIAL_CTRL_STS_AMDIX_ENABLE_)
  			return ETH_TP_MDI_AUTO;
  		else if (buf & SPECIAL_CTRL_STS_AMDIX_STATE_)
  			return ETH_TP_MDI_X;
  	} else {
  		buf = smsc95xx_read_reg(dev, STRAP_STATUS, &val);
  		if (val & STRAP_STATUS_AMDIX_EN_)
  			return ETH_TP_MDI_AUTO;
  	}
  
  	return ETH_TP_MDI;
  }
  
  static void set_mdix_status(struct net_device *net, __u8 mdix_ctrl)
  {
  	struct usbnet *dev = netdev_priv(net);
  	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
  	int buf;
  
  	if ((pdata->chip_id == ID_REV_CHIP_ID_9500A_) ||
  	    (pdata->chip_id == ID_REV_CHIP_ID_9530_) ||
  	    (pdata->chip_id == ID_REV_CHIP_ID_89530_) ||
  	    (pdata->chip_id == ID_REV_CHIP_ID_9730_)) {
  		/* Extend Manual AutoMDIX timer for 9500A/9500Ai */
  		buf = smsc95xx_mdio_read(dev->net, dev->mii.phy_id,
  					 PHY_EDPD_CONFIG);
  		buf |= PHY_EDPD_CONFIG_EXT_CROSSOVER_;
  		smsc95xx_mdio_write(dev->net, dev->mii.phy_id,
  				    PHY_EDPD_CONFIG, buf);
  	}
  
  	if (mdix_ctrl == ETH_TP_MDI) {
  		buf = smsc95xx_mdio_read(dev->net, dev->mii.phy_id,
  					 SPECIAL_CTRL_STS);
  		buf |= SPECIAL_CTRL_STS_OVRRD_AMDIX_;
  		buf &= ~(SPECIAL_CTRL_STS_AMDIX_ENABLE_ |
  			 SPECIAL_CTRL_STS_AMDIX_STATE_);
  		smsc95xx_mdio_write(dev->net, dev->mii.phy_id,
  				    SPECIAL_CTRL_STS, buf);
  	} else if (mdix_ctrl == ETH_TP_MDI_X) {
  		buf = smsc95xx_mdio_read(dev->net, dev->mii.phy_id,
  					 SPECIAL_CTRL_STS);
  		buf |= SPECIAL_CTRL_STS_OVRRD_AMDIX_;
  		buf &= ~(SPECIAL_CTRL_STS_AMDIX_ENABLE_ |
  			 SPECIAL_CTRL_STS_AMDIX_STATE_);
  		buf |= SPECIAL_CTRL_STS_AMDIX_STATE_;
  		smsc95xx_mdio_write(dev->net, dev->mii.phy_id,
  				    SPECIAL_CTRL_STS, buf);
  	} else if (mdix_ctrl == ETH_TP_MDI_AUTO) {
  		buf = smsc95xx_mdio_read(dev->net, dev->mii.phy_id,
  					 SPECIAL_CTRL_STS);
  		buf &= ~SPECIAL_CTRL_STS_OVRRD_AMDIX_;
  		buf &= ~(SPECIAL_CTRL_STS_AMDIX_ENABLE_ |
  			 SPECIAL_CTRL_STS_AMDIX_STATE_);
  		buf |= SPECIAL_CTRL_STS_AMDIX_ENABLE_;
  		smsc95xx_mdio_write(dev->net, dev->mii.phy_id,
  				    SPECIAL_CTRL_STS, buf);
  	}
  	pdata->mdix_ctrl = mdix_ctrl;
  }
  
  static int smsc95xx_get_link_ksettings(struct net_device *net,
  				       struct ethtool_link_ksettings *cmd)
  {
  	struct usbnet *dev = netdev_priv(net);
  	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
  	int retval;
  
  	retval = usbnet_get_link_ksettings(net, cmd);
  
  	cmd->base.eth_tp_mdix = pdata->mdix_ctrl;
  	cmd->base.eth_tp_mdix_ctrl = pdata->mdix_ctrl;
  
  	return retval;
  }
  
  static int smsc95xx_set_link_ksettings(struct net_device *net,
  				       const struct ethtool_link_ksettings *cmd)
  {
  	struct usbnet *dev = netdev_priv(net);
  	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
  	int retval;
  
  	if (pdata->mdix_ctrl != cmd->base.eth_tp_mdix_ctrl)
  		set_mdix_status(net, cmd->base.eth_tp_mdix_ctrl);
  
  	retval = usbnet_set_link_ksettings(net, cmd);
  
  	return retval;
  }
  
  static const struct ethtool_ops smsc95xx_ethtool_ops = {
  	.get_link	= usbnet_get_link,
  	.nway_reset	= usbnet_nway_reset,
  	.get_drvinfo	= usbnet_get_drvinfo,
  	.get_msglevel	= usbnet_get_msglevel,
  	.set_msglevel	= usbnet_set_msglevel,
  	.get_eeprom_len	= smsc95xx_ethtool_get_eeprom_len,
  	.get_eeprom	= smsc95xx_ethtool_get_eeprom,
  	.set_eeprom	= smsc95xx_ethtool_set_eeprom,
  	.get_regs_len	= smsc95xx_ethtool_getregslen,
  	.get_regs	= smsc95xx_ethtool_getregs,
  	.get_wol	= smsc95xx_ethtool_get_wol,
  	.set_wol	= smsc95xx_ethtool_set_wol,
  	.get_link_ksettings	= smsc95xx_get_link_ksettings,
  	.set_link_ksettings	= smsc95xx_set_link_ksettings,
  	.get_ts_info	= ethtool_op_get_ts_info,
  };
  
  static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
  {
  	struct usbnet *dev = netdev_priv(netdev);
  
  	if (!netif_running(netdev))
  		return -EINVAL;
  
  	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
  }
  
  static void smsc95xx_init_mac_address(struct usbnet *dev)
  {
  	const u8 *mac_addr;
  
  	/* maybe the boot loader passed the MAC address in devicetree */
  	mac_addr = of_get_mac_address(dev->udev->dev.of_node);
  	if (!IS_ERR(mac_addr)) {
  		ether_addr_copy(dev->net->dev_addr, mac_addr);
  		return;
  	}
  
  	/* try reading mac address from EEPROM */
  	if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
  			dev->net->dev_addr) == 0) {
  		if (is_valid_ether_addr(dev->net->dev_addr)) {
  			/* eeprom values are valid so use them */
  			netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
  			return;
  		}
  	}
  
  	/* no useful static MAC address found. generate a random one */
  	eth_hw_addr_random(dev->net);
  	netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
  }
  
  static int smsc95xx_set_mac_address(struct usbnet *dev)
  {
  	u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
  		dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
  	u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
  	int ret;
  
  	ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
  	if (ret < 0)
  		return ret;
  
  	return smsc95xx_write_reg(dev, ADDRH, addr_hi);
  }
  
  /* starts the TX path */
  static int smsc95xx_start_tx_path(struct usbnet *dev)
  {
  	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
  	unsigned long flags;
  	int ret;
  
  	/* Enable Tx at MAC */
  	spin_lock_irqsave(&pdata->mac_cr_lock, flags);
  	pdata->mac_cr |= MAC_CR_TXEN_;
  	spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
  
  	ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
  	if (ret < 0)
  		return ret;
  
  	/* Enable Tx at SCSRs */
  	return smsc95xx_write_reg(dev, TX_CFG, TX_CFG_ON_);
  }
  
  /* Starts the Receive path */
  static int smsc95xx_start_rx_path(struct usbnet *dev, int in_pm)
  {
  	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
  	unsigned long flags;
  
  	spin_lock_irqsave(&pdata->mac_cr_lock, flags);
  	pdata->mac_cr |= MAC_CR_RXEN_;
  	spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
  
  	return __smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr, in_pm);
  }
  
  static int smsc95xx_phy_initialize(struct usbnet *dev)
  {
  	int bmcr, ret, timeout = 0;
  
  	/* Initialize MII structure */
  	dev->mii.dev = dev->net;
  	dev->mii.mdio_read = smsc95xx_mdio_read;
  	dev->mii.mdio_write = smsc95xx_mdio_write;
  	dev->mii.phy_id_mask = 0x1f;
  	dev->mii.reg_num_mask = 0x1f;
  	dev->mii.phy_id = SMSC95XX_INTERNAL_PHY_ID;
  
  	/* reset phy and wait for reset to complete */
  	smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR, BMCR_RESET);
  
  	do {
  		msleep(10);
  		bmcr = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, MII_BMCR);
  		timeout++;
  	} while ((bmcr & BMCR_RESET) && (timeout < 100));
  
  	if (timeout >= 100) {
  		netdev_warn(dev->net, "timeout on PHY Reset");
  		return -EIO;
  	}
  
  	smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE,
  		ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP |
  		ADVERTISE_PAUSE_ASYM);
  
  	/* read to clear */
  	ret = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, PHY_INT_SRC);
  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read PHY_INT_SRC during init\n");
  		return ret;
  	}
  
  	smsc95xx_mdio_write(dev->net, dev->mii.phy_id, PHY_INT_MASK,
  		PHY_INT_MASK_DEFAULT_);
  	mii_nway_restart(&dev->mii);
  
  	netif_dbg(dev, ifup, dev->net, "phy initialised successfully\n");
  	return 0;
  }
  
  static int smsc95xx_reset(struct usbnet *dev)
  {
  	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
  	u32 read_buf, write_buf, burst_cap;
  	int ret = 0, timeout;
  
  	netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
  
  	ret = smsc95xx_write_reg(dev, HW_CFG, HW_CFG_LRST_);
  	if (ret < 0)
  		return ret;
  
  	timeout = 0;
  	do {
  		msleep(10);
  		ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
  		if (ret < 0)
  			return ret;
  		timeout++;
  	} while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
  
  	if (timeout >= 100) {
  		netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
  		return ret;
  	}
  
  	ret = smsc95xx_write_reg(dev, PM_CTRL, PM_CTL_PHY_RST_);
  	if (ret < 0)
  		return ret;
  
  	timeout = 0;
  	do {
  		msleep(10);
  		ret = smsc95xx_read_reg(dev, PM_CTRL, &read_buf);
  		if (ret < 0)
  			return ret;
  		timeout++;
  	} while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100));
  
  	if (timeout >= 100) {
  		netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
  		return ret;
  	}
  
  	ret = smsc95xx_set_mac_address(dev);
  	if (ret < 0)
  		return ret;
  
  	netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
  		  dev->net->dev_addr);
  
  	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
  	if (ret < 0)
  		return ret;
  
  	netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
  		  read_buf);
  
  	read_buf |= HW_CFG_BIR_;
  
  	ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
  	if (ret < 0)
  		return ret;
  
  	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
  	if (ret < 0)
  		return ret;
  
  	netif_dbg(dev, ifup, dev->net,
  		  "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
  		  read_buf);
  
  	if (!turbo_mode) {
  		burst_cap = 0;
  		dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
  	} else if (dev->udev->speed == USB_SPEED_HIGH) {
  		burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
  		dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
  	} else {
  		burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
  		dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
  	}
  
  	netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld\n",
  		  (ulong)dev->rx_urb_size);
  
  	ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
  	if (ret < 0)
  		return ret;
  
  	ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
  	if (ret < 0)
  		return ret;
  
  	netif_dbg(dev, ifup, dev->net,
  		  "Read Value from BURST_CAP after writing: 0x%08x\n",
  		  read_buf);
  
  	ret = smsc95xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
  	if (ret < 0)
  		return ret;
  
  	ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
  	if (ret < 0)
  		return ret;
  
  	netif_dbg(dev, ifup, dev->net,
  		  "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
  		  read_buf);
  
  	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
  	if (ret < 0)
  		return ret;
  
  	netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG: 0x%08x\n",
  		  read_buf);
  
  	if (turbo_mode)
  		read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
  
  	read_buf &= ~HW_CFG_RXDOFF_;
  
  	/* set Rx data offset=2, Make IP header aligns on word boundary. */
  	read_buf |= NET_IP_ALIGN << 9;
  
  	ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
  	if (ret < 0)
  		return ret;
  
  	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
  	if (ret < 0)
  		return ret;
  
  	netif_dbg(dev, ifup, dev->net,
  		  "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
  
  	ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
  	if (ret < 0)
  		return ret;
  
  	ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
  	if (ret < 0)
  		return ret;
  	netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
  
  	/* Configure GPIO pins as LED outputs */
  	write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
  		LED_GPIO_CFG_FDX_LED;
  	ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
  	if (ret < 0)
  		return ret;
  
  	/* Init Tx */
  	ret = smsc95xx_write_reg(dev, FLOW, 0);
  	if (ret < 0)
  		return ret;
  
  	ret = smsc95xx_write_reg(dev, AFC_CFG, AFC_CFG_DEFAULT);
  	if (ret < 0)
  		return ret;
  
  	/* Don't need mac_cr_lock during initialisation */
  	ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
  	if (ret < 0)
  		return ret;
  
  	/* Init Rx */
  	/* Set Vlan */
  	ret = smsc95xx_write_reg(dev, VLAN1, (u32)ETH_P_8021Q);
  	if (ret < 0)
  		return ret;
  
  	/* Enable or disable checksum offload engines */
  	ret = smsc95xx_set_features(dev->net, dev->net->features);
  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to set checksum offload features\n");
  		return ret;
  	}
  
  	smsc95xx_set_multicast(dev->net);
  
  	ret = smsc95xx_phy_initialize(dev);
  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to init PHY\n");
  		return ret;
  	}
  
  	ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
  	if (ret < 0)
  		return ret;
  
  	/* enable PHY interrupts */
  	read_buf |= INT_EP_CTL_PHY_INT_;
  
  	ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
  	if (ret < 0)
  		return ret;
  
  	ret = smsc95xx_start_tx_path(dev);
  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to start TX path\n");
  		return ret;
  	}
  
  	ret = smsc95xx_start_rx_path(dev, 0);
  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to start RX path\n");
  		return ret;
  	}
  
  	netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
  	return 0;
  }
  
  static const struct net_device_ops smsc95xx_netdev_ops = {
  	.ndo_open		= usbnet_open,
  	.ndo_stop		= usbnet_stop,
  	.ndo_start_xmit		= usbnet_start_xmit,
  	.ndo_tx_timeout		= usbnet_tx_timeout,
  	.ndo_change_mtu		= usbnet_change_mtu,
  	.ndo_get_stats64	= usbnet_get_stats64,
  	.ndo_set_mac_address 	= eth_mac_addr,
  	.ndo_validate_addr	= eth_validate_addr,
  	.ndo_do_ioctl 		= smsc95xx_ioctl,
  	.ndo_set_rx_mode	= smsc95xx_set_multicast,
  	.ndo_set_features	= smsc95xx_set_features,
  };
  
  static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
  {
  	struct smsc95xx_priv *pdata = NULL;
  	u32 val;
  	int ret;
  
  	printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
  
  	ret = usbnet_get_endpoints(dev, intf);
  	if (ret < 0) {
  		netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
  		return ret;
  	}
  
  	dev->data[0] = (unsigned long)kzalloc(sizeof(struct smsc95xx_priv),
  					      GFP_KERNEL);
  
  	pdata = (struct smsc95xx_priv *)(dev->data[0]);
  	if (!pdata)
  		return -ENOMEM;
  
  	spin_lock_init(&pdata->mac_cr_lock);
  
  	/* LAN95xx devices do not alter the computed checksum of 0 to 0xffff.
  	 * RFC 2460, ipv6 UDP calculated checksum yields a result of zero must
  	 * be changed to 0xffff. RFC 768, ipv4 UDP computed checksum is zero,
  	 * it is transmitted as all ones. The zero transmitted checksum means
  	 * transmitter generated no checksum. Hence, enable csum offload only
  	 * for ipv4 packets.
  	 */
  	if (DEFAULT_TX_CSUM_ENABLE)
  		dev->net->features |= NETIF_F_IP_CSUM;
  	if (DEFAULT_RX_CSUM_ENABLE)
  		dev->net->features |= NETIF_F_RXCSUM;
  
  	dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
  	set_bit(EVENT_NO_IP_ALIGN, &dev->flags);
  
  	smsc95xx_init_mac_address(dev);
  
  	/* Init all registers */
  	ret = smsc95xx_reset(dev);
  
  	/* detect device revision as different features may be available */
  	ret = smsc95xx_read_reg(dev, ID_REV, &val);
  	if (ret < 0)
  		return ret;
  	val >>= 16;
  	pdata->chip_id = val;
  	pdata->mdix_ctrl = get_mdix_status(dev->net);
  
  	if ((val == ID_REV_CHIP_ID_9500A_) || (val == ID_REV_CHIP_ID_9530_) ||
  	    (val == ID_REV_CHIP_ID_89530_) || (val == ID_REV_CHIP_ID_9730_))
  		pdata->features = (FEATURE_8_WAKEUP_FILTERS |
  			FEATURE_PHY_NLP_CROSSOVER |
  			FEATURE_REMOTE_WAKEUP);
  	else if (val == ID_REV_CHIP_ID_9512_)
  		pdata->features = FEATURE_8_WAKEUP_FILTERS;
  
  	dev->net->netdev_ops = &smsc95xx_netdev_ops;
  	dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
  	dev->net->flags |= IFF_MULTICAST;
  	dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
  	dev->net->min_mtu = ETH_MIN_MTU;
  	dev->net->max_mtu = ETH_DATA_LEN;
  	dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
  
  	pdata->dev = dev;
  	INIT_DELAYED_WORK(&pdata->carrier_check, check_carrier);
  	schedule_delayed_work(&pdata->carrier_check, CARRIER_CHECK_DELAY);
  
  	return 0;
  }
  
  static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
  {
  	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
  
  	if (pdata) {
  		cancel_delayed_work(&pdata->carrier_check);
  		netif_dbg(dev, ifdown, dev->net, "free pdata\n");
  		kfree(pdata);
  		pdata = NULL;
  		dev->data[0] = 0;
  	}
  }
  
  static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
  {
  	u32 crc = bitrev16(crc16(0xFFFF, buffer, len));
  	return crc << ((filter % 2) * 16);
  }
  
  static int smsc95xx_enable_phy_wakeup_interrupts(struct usbnet *dev, u16 mask)
  {
  	struct mii_if_info *mii = &dev->mii;
  	int ret;
  
  	netdev_dbg(dev->net, "enabling PHY wakeup interrupts\n");
  
  	/* read to clear */
  	ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, PHY_INT_SRC);
  	if (ret < 0)
  		return ret;
  
  	/* enable interrupt source */
  	ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, PHY_INT_MASK);
  	if (ret < 0)
  		return ret;
  
  	ret |= mask;
  
  	smsc95xx_mdio_write_nopm(dev->net, mii->phy_id, PHY_INT_MASK, ret);
  
  	return 0;
  }
  
  static int smsc95xx_link_ok_nopm(struct usbnet *dev)
  {
  	struct mii_if_info *mii = &dev->mii;
  	int ret;
  
  	/* first, a dummy read, needed to latch some MII phys */
  	ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, MII_BMSR);
  	if (ret < 0)
  		return ret;
  
  	ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, MII_BMSR);
  	if (ret < 0)
  		return ret;
  
  	return !!(ret & BMSR_LSTATUS);
  }
  
  static int smsc95xx_enter_suspend0(struct usbnet *dev)
  {
  	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
  	u32 val;
  	int ret;
  
  	ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
  	if (ret < 0)
  		return ret;
  
  	val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
  	val |= PM_CTL_SUS_MODE_0;
  
  	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
  	if (ret < 0)
  		return ret;
  
  	/* clear wol status */
  	val &= ~PM_CTL_WUPS_;
  	val |= PM_CTL_WUPS_WOL_;
  
  	/* enable energy detection */
  	if (pdata->wolopts & WAKE_PHY)
  		val |= PM_CTL_WUPS_ED_;
  
  	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
  	if (ret < 0)
  		return ret;
  
  	/* read back PM_CTRL */
  	ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
  	if (ret < 0)
  		return ret;
  
  	pdata->suspend_flags |= SUSPEND_SUSPEND0;
  
  	return 0;
  }
  
  static int smsc95xx_enter_suspend1(struct usbnet *dev)
  {
  	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
  	struct mii_if_info *mii = &dev->mii;
  	u32 val;
  	int ret;
  
  	/* reconfigure link pulse detection timing for
  	 * compatibility with non-standard link partners
  	 */
  	if (pdata->features & FEATURE_PHY_NLP_CROSSOVER)
  		smsc95xx_mdio_write_nopm(dev->net, mii->phy_id,	PHY_EDPD_CONFIG,
  			PHY_EDPD_CONFIG_DEFAULT);
  
  	/* enable energy detect power-down mode */
  	ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, PHY_MODE_CTRL_STS);
  	if (ret < 0)
  		return ret;
  
  	ret |= MODE_CTRL_STS_EDPWRDOWN_;
  
  	smsc95xx_mdio_write_nopm(dev->net, mii->phy_id, PHY_MODE_CTRL_STS, ret);
  
  	/* enter SUSPEND1 mode */
  	ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
  	if (ret < 0)
  		return ret;
  
  	val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
  	val |= PM_CTL_SUS_MODE_1;
  
  	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
  	if (ret < 0)
  		return ret;
  
  	/* clear wol status, enable energy detection */
  	val &= ~PM_CTL_WUPS_;
  	val |= (PM_CTL_WUPS_ED_ | PM_CTL_ED_EN_);
  
  	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
  	if (ret < 0)
  		return ret;
  
  	pdata->suspend_flags |= SUSPEND_SUSPEND1;
  
  	return 0;
  }
  
  static int smsc95xx_enter_suspend2(struct usbnet *dev)
  {
  	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
  	u32 val;
  	int ret;
  
  	ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
  	if (ret < 0)
  		return ret;
  
  	val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
  	val |= PM_CTL_SUS_MODE_2;
  
  	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
  	if (ret < 0)
  		return ret;
  
  	pdata->suspend_flags |= SUSPEND_SUSPEND2;
  
  	return 0;
  }
  
  static int smsc95xx_enter_suspend3(struct usbnet *dev)
  {
  	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
  	u32 val;
  	int ret;
  
  	ret = smsc95xx_read_reg_nopm(dev, RX_FIFO_INF, &val);
  	if (ret < 0)
  		return ret;
  
  	if (val & RX_FIFO_INF_USED_) {
  		netdev_info(dev->net, "rx fifo not empty in autosuspend\n");
  		return -EBUSY;
  	}
  
  	ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
  	if (ret < 0)
  		return ret;
  
  	val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
  	val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS;
  
  	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
  	if (ret < 0)
  		return ret;
  
  	/* clear wol status */
  	val &= ~PM_CTL_WUPS_;
  	val |= PM_CTL_WUPS_WOL_;
  
  	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
  	if (ret < 0)
  		return ret;
  
  	pdata->suspend_flags |= SUSPEND_SUSPEND3;
  
  	return 0;
  }
  
  static int smsc95xx_autosuspend(struct usbnet *dev, u32 link_up)
  {
  	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
  	int ret;
  
  	if (!netif_running(dev->net)) {
  		/* interface is ifconfig down so fully power down hw */
  		netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n");
  		return smsc95xx_enter_suspend2(dev);
  	}
  
  	if (!link_up) {
  		/* link is down so enter EDPD mode, but only if device can
  		 * reliably resume from it.  This check should be redundant
  		 * as current FEATURE_REMOTE_WAKEUP parts also support
  		 * FEATURE_PHY_NLP_CROSSOVER but it's included for clarity */
  		if (!(pdata->features & FEATURE_PHY_NLP_CROSSOVER)) {
  			netdev_warn(dev->net, "EDPD not supported\n");
  			return -EBUSY;
  		}
  
  		netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");
  
  		/* enable PHY wakeup events for if cable is attached */
  		ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
  			PHY_INT_MASK_ANEG_COMP_);
  		if (ret < 0) {
  			netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
  			return ret;
  		}
  
  		netdev_info(dev->net, "entering SUSPEND1 mode\n");
  		return smsc95xx_enter_suspend1(dev);
  	}
  
  	/* enable PHY wakeup events so we remote wakeup if cable is pulled */
  	ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
  		PHY_INT_MASK_LINK_DOWN_);
  	if (ret < 0) {
  		netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
  		return ret;
  	}
  
  	netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
  	return smsc95xx_enter_suspend3(dev);
  }
  
  static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
  {
  	struct usbnet *dev = usb_get_intfdata(intf);
  	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
  	u32 val, link_up;
  	int ret;
  
  	ret = usbnet_suspend(intf, message);
  	if (ret < 0) {
  		netdev_warn(dev->net, "usbnet_suspend error\n");
  		return ret;
  	}
  
  	cancel_delayed_work_sync(&pdata->carrier_check);
  
  	if (pdata->suspend_flags) {
  		netdev_warn(dev->net, "error during last resume\n");
  		pdata->suspend_flags = 0;
  	}
  
  	/* determine if link is up using only _nopm functions */
  	link_up = smsc95xx_link_ok_nopm(dev);
  
  	if (message.event == PM_EVENT_AUTO_SUSPEND &&
  	    (pdata->features & FEATURE_REMOTE_WAKEUP)) {
  		ret = smsc95xx_autosuspend(dev, link_up);
  		goto done;
  	}
  
  	/* if we get this far we're not autosuspending */
  	/* if no wol options set, or if link is down and we're not waking on
  	 * PHY activity, enter lowest power SUSPEND2 mode
  	 */
  	if (!(pdata->wolopts & SUPPORTED_WAKE) ||
  		!(link_up || (pdata->wolopts & WAKE_PHY))) {
  		netdev_info(dev->net, "entering SUSPEND2 mode\n");
  
  		/* disable energy detect (link up) & wake up events */
  		ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
  		if (ret < 0)
  			goto done;
  
  		val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
  
  		ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
  		if (ret < 0)
  			goto done;
  
  		ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
  		if (ret < 0)
  			goto done;
  
  		val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
  
  		ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
  		if (ret < 0)
  			goto done;
  
  		ret = smsc95xx_enter_suspend2(dev);
  		goto done;
  	}
  
  	if (pdata->wolopts & WAKE_PHY) {
  		ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
  			(PHY_INT_MASK_ANEG_COMP_ | PHY_INT_MASK_LINK_DOWN_));
  		if (ret < 0) {
  			netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
  			goto done;
  		}
  
  		/* if link is down then configure EDPD and enter SUSPEND1,
  		 * otherwise enter SUSPEND0 below
  		 */
  		if (!link_up) {
  			netdev_info(dev->net, "entering SUSPEND1 mode\n");
  			ret = smsc95xx_enter_suspend1(dev);
  			goto done;
  		}
  	}
  
  	if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
  		u32 *filter_mask = kcalloc(32, sizeof(u32), GFP_KERNEL);
  		u32 command[2];
  		u32 offset[2];
  		u32 crc[4];
  		int wuff_filter_count =
  			(pdata->features & FEATURE_8_WAKEUP_FILTERS) ?
  			LAN9500A_WUFF_NUM : LAN9500_WUFF_NUM;
  		int i, filter = 0;
  
  		if (!filter_mask) {
  			netdev_warn(dev->net, "Unable to allocate filter_mask\n");
  			ret = -ENOMEM;
  			goto done;
  		}
  
  		memset(command, 0, sizeof(command));
  		memset(offset, 0, sizeof(offset));
  		memset(crc, 0, sizeof(crc));
  
  		if (pdata->wolopts & WAKE_BCAST) {
  			const u8 bcast[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
  			netdev_info(dev->net, "enabling broadcast detection\n");
  			filter_mask[filter * 4] = 0x003F;
  			filter_mask[filter * 4 + 1] = 0x00;
  			filter_mask[filter * 4 + 2] = 0x00;
  			filter_mask[filter * 4 + 3] = 0x00;
  			command[filter/4] |= 0x05UL << ((filter % 4) * 8);
  			offset[filter/4] |= 0x00 << ((filter % 4) * 8);
  			crc[filter/2] |= smsc_crc(bcast, 6, filter);
  			filter++;
  		}
  
  		if (pdata->wolopts & WAKE_MCAST) {
  			const u8 mcast[] = {0x01, 0x00, 0x5E};
  			netdev_info(dev->net, "enabling multicast detection\n");
  			filter_mask[filter * 4] = 0x0007;
  			filter_mask[filter * 4 + 1] = 0x00;
  			filter_mask[filter * 4 + 2] = 0x00;
  			filter_mask[filter * 4 + 3] = 0x00;
  			command[filter/4] |= 0x09UL << ((filter % 4) * 8);
  			offset[filter/4] |= 0x00  << ((filter % 4) * 8);
  			crc[filter/2] |= smsc_crc(mcast, 3, filter);
  			filter++;
  		}
  
  		if (pdata->wolopts & WAKE_ARP) {
  			const u8 arp[] = {0x08, 0x06};
  			netdev_info(dev->net, "enabling ARP detection\n");
  			filter_mask[filter * 4] = 0x0003;
  			filter_mask[filter * 4 + 1] = 0x00;
  			filter_mask[filter * 4 + 2] = 0x00;
  			filter_mask[filter * 4 + 3] = 0x00;
  			command[filter/4] |= 0x05UL << ((filter % 4) * 8);
  			offset[filter/4] |= 0x0C << ((filter % 4) * 8);
  			crc[filter/2] |= smsc_crc(arp, 2, filter);
  			filter++;
  		}
  
  		if (pdata->wolopts & WAKE_UCAST) {
  			netdev_info(dev->net, "enabling unicast detection\n");
  			filter_mask[filter * 4] = 0x003F;
  			filter_mask[filter * 4 + 1] = 0x00;
  			filter_mask[filter * 4 + 2] = 0x00;
  			filter_mask[filter * 4 + 3] = 0x00;
  			command[filter/4] |= 0x01UL << ((filter % 4) * 8);
  			offset[filter/4] |= 0x00 << ((filter % 4) * 8);
  			crc[filter/2] |= smsc_crc(dev->net->dev_addr, ETH_ALEN, filter);
  			filter++;
  		}
  
  		for (i = 0; i < (wuff_filter_count * 4); i++) {
  			ret = smsc95xx_write_reg_nopm(dev, WUFF, filter_mask[i]);
  			if (ret < 0) {
  				kfree(filter_mask);
  				goto done;
  			}
  		}
  		kfree(filter_mask);
  
  		for (i = 0; i < (wuff_filter_count / 4); i++) {
  			ret = smsc95xx_write_reg_nopm(dev, WUFF, command[i]);
  			if (ret < 0)
  				goto done;
  		}
  
  		for (i = 0; i < (wuff_filter_count / 4); i++) {
  			ret = smsc95xx_write_reg_nopm(dev, WUFF, offset[i]);
  			if (ret < 0)
  				goto done;
  		}
  
  		for (i = 0; i < (wuff_filter_count / 2); i++) {
  			ret = smsc95xx_write_reg_nopm(dev, WUFF, crc[i]);
  			if (ret < 0)
  				goto done;
  		}
  
  		/* clear any pending pattern match packet status */
  		ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
  		if (ret < 0)
  			goto done;
  
  		val |= WUCSR_WUFR_;
  
  		ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
  		if (ret < 0)
  			goto done;
  	}
  
  	if (pdata->wolopts & WAKE_MAGIC) {
  		/* clear any pending magic packet status */
  		ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
  		if (ret < 0)
  			goto done;
  
  		val |= WUCSR_MPR_;
  
  		ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
  		if (ret < 0)
  			goto done;
  	}
  
  	/* enable/disable wakeup sources */
  	ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
  	if (ret < 0)
  		goto done;
  
  	if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
  		netdev_info(dev->net, "enabling pattern match wakeup\n");
  		val |= WUCSR_WAKE_EN_;
  	} else {
  		netdev_info(dev->net, "disabling pattern match wakeup\n");
  		val &= ~WUCSR_WAKE_EN_;
  	}
  
  	if (pdata->wolopts & WAKE_MAGIC) {
  		netdev_info(dev->net, "enabling magic packet wakeup\n");
  		val |= WUCSR_MPEN_;
  	} else {
  		netdev_info(dev->net, "disabling magic packet wakeup\n");
  		val &= ~WUCSR_MPEN_;
  	}
  
  	ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
  	if (ret < 0)
  		goto done;
  
  	/* enable wol wakeup source */
  	ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
  	if (ret < 0)
  		goto done;
  
  	val |= PM_CTL_WOL_EN_;
  
  	/* phy energy detect wakeup source */
  	if (pdata->wolopts & WAKE_PHY)
  		val |= PM_CTL_ED_EN_;
  
  	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
  	if (ret < 0)
  		goto done;
  
  	/* enable receiver to enable frame reception */
  	smsc95xx_start_rx_path(dev, 1);
  
  	/* some wol options are enabled, so enter SUSPEND0 */
  	netdev_info(dev->net, "entering SUSPEND0 mode\n");
  	ret = smsc95xx_enter_suspend0(dev);
  
  done:
  	/*
  	 * TODO: resume() might need to handle the suspend failure
  	 * in system sleep
  	 */
  	if (ret && PMSG_IS_AUTO(message))
  		usbnet_resume(intf);
  
  	if (ret)
  		schedule_delayed_work(&pdata->carrier_check,
  				      CARRIER_CHECK_DELAY);
  
  	return ret;
  }
  
  static int smsc95xx_resume(struct usb_interface *intf)
  {
  	struct usbnet *dev = usb_get_intfdata(intf);
  	struct smsc95xx_priv *pdata;
  	u8 suspend_flags;
  	int ret;
  	u32 val;
  
  	BUG_ON(!dev);
  	pdata = (struct smsc95xx_priv *)(dev->data[0]);
  	suspend_flags = pdata->suspend_flags;
  
  	netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
  
  	/* do this first to ensure it's cleared even in error case */
  	pdata->suspend_flags = 0;
  	schedule_delayed_work(&pdata->carrier_check, CARRIER_CHECK_DELAY);
  
  	if (suspend_flags & SUSPEND_ALLMODES) {
  		/* clear wake-up sources */
  		ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
  		if (ret < 0)
  			return ret;
  
  		val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
  
  		ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
  		if (ret < 0)
  			return ret;
  
  		/* clear wake-up status */
  		ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
  		if (ret < 0)
  			return ret;
  
  		val &= ~PM_CTL_WOL_EN_;
  		val |= PM_CTL_WUPS_;
  
  		ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
  		if (ret < 0)
  			return ret;
  	}
  
  	ret = usbnet_resume(intf);
  	if (ret < 0)
  		netdev_warn(dev->net, "usbnet_resume error\n");
  
  	return ret;
  }
  
  static int smsc95xx_reset_resume(struct usb_interface *intf)
  {
  	struct usbnet *dev = usb_get_intfdata(intf);
  	int ret;
  
  	ret = smsc95xx_reset(dev);
  	if (ret < 0)
  		return ret;
  
  	return smsc95xx_resume(intf);
  }
  
  static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
  {
  	skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
  	skb->ip_summed = CHECKSUM_COMPLETE;
  	skb_trim(skb, skb->len - 2);
  }
  
  static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
  {
  	/* This check is no longer done by usbnet */
  	if (skb->len < dev->net->hard_header_len)
  		return 0;
  
  	while (skb->len > 0) {
  		u32 header, align_count;
  		struct sk_buff *ax_skb;
  		unsigned char *packet;
  		u16 size;
  
  		header = get_unaligned_le32(skb->data);
  		skb_pull(skb, 4 + NET_IP_ALIGN);
  		packet = skb->data;
  
  		/* get the packet length */
  		size = (u16)((header & RX_STS_FL_) >> 16);
  		align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
  
  		if (unlikely(header & RX_STS_ES_)) {
  			netif_dbg(dev, rx_err, dev->net,
  				  "Error header=0x%08x\n", header);
  			dev->net->stats.rx_errors++;
  			dev->net->stats.rx_dropped++;
  
  			if (header & RX_STS_CRC_) {
  				dev->net->stats.rx_crc_errors++;
  			} else {
  				if (header & (RX_STS_TL_ | RX_STS_RF_))
  					dev->net->stats.rx_frame_errors++;
  
  				if ((header & RX_STS_LE_) &&
  					(!(header & RX_STS_FT_)))
  					dev->net->stats.rx_length_errors++;
  			}
  		} else {
  			/* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
  			if (unlikely(size > (ETH_FRAME_LEN + 12))) {
  				netif_dbg(dev, rx_err, dev->net,
  					  "size err header=0x%08x\n", header);
  				return 0;
  			}
  
  			/* last frame in this batch */
  			if (skb->len == size) {
  				if (dev->net->features & NETIF_F_RXCSUM)
  					smsc95xx_rx_csum_offload(skb);
  				skb_trim(skb, skb->len - 4); /* remove fcs */
  				skb->truesize = size + sizeof(struct sk_buff);
  
  				return 1;
  			}
  
  			ax_skb = skb_clone(skb, GFP_ATOMIC);
  			if (unlikely(!ax_skb)) {
  				netdev_warn(dev->net, "Error allocating skb\n");
  				return 0;
  			}
  
  			ax_skb->len = size;
  			ax_skb->data = packet;
  			skb_set_tail_pointer(ax_skb, size);
  
  			if (dev->net->features & NETIF_F_RXCSUM)
  				smsc95xx_rx_csum_offload(ax_skb);
  			skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
  			ax_skb->truesize = size + sizeof(struct sk_buff);
  
  			usbnet_skb_return(dev, ax_skb);
  		}
  
  		skb_pull(skb, size);
  
  		/* padding bytes before the next frame starts */
  		if (skb->len)
  			skb_pull(skb, align_count);
  	}
  
  	return 1;
  }
  
  static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
  {
  	u16 low_16 = (u16)skb_checksum_start_offset(skb);
  	u16 high_16 = low_16 + skb->csum_offset;
  	return (high_16 << 16) | low_16;
  }
  
  /* The TX CSUM won't work if the checksum lies in the last 4 bytes of the
   * transmission. This is fairly unlikely, only seems to trigger with some
   * short TCP ACK packets sent.
   *
   * Note, this calculation should probably check for the alignment of the
   * data as well, but a straight check for csum being in the last four bytes
   * of the packet should be ok for now.
   */
  static bool smsc95xx_can_tx_checksum(struct sk_buff *skb)
  {
         unsigned int len = skb->len - skb_checksum_start_offset(skb);
  
         if (skb->len <= 45)
  	       return false;
         return skb->csum_offset < (len - (4 + 1));
  }
  
  static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
  					 struct sk_buff *skb, gfp_t flags)
  {
  	bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
  	int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
  	u32 tx_cmd_a, tx_cmd_b;
  	void *ptr;
  
  	/* We do not advertise SG, so skbs should be already linearized */
  	BUG_ON(skb_shinfo(skb)->nr_frags);
  
  	/* Make writable and expand header space by overhead if required */
  	if (skb_cow_head(skb, overhead)) {
  		/* Must deallocate here as returning NULL to indicate error
  		 * means the skb won't be deallocated in the caller.
  		 */
  		dev_kfree_skb_any(skb);
  		return NULL;
  	}
  
  	tx_cmd_b = (u32)skb->len;
  	tx_cmd_a = tx_cmd_b | TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
  
  	if (csum) {
  		if (!smsc95xx_can_tx_checksum(skb)) {
  			/* workaround - hardware tx checksum does not work
  			 * properly with extremely small packets */
  			long csstart = skb_checksum_start_offset(skb);
  			__wsum calc = csum_partial(skb->data + csstart,
  				skb->len - csstart, 0);
  			*((__sum16 *)(skb->data + csstart
  				+ skb->csum_offset)) = csum_fold(calc);
  
  			csum = false;
  		} else {
  			u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
  			ptr = skb_push(skb, 4);
  			put_unaligned_le32(csum_preamble, ptr);
  
  			tx_cmd_a += 4;
  			tx_cmd_b += 4;
  			tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
  		}
  	}
  
  	ptr = skb_push(skb, 8);
  	put_unaligned_le32(tx_cmd_a, ptr);
  	put_unaligned_le32(tx_cmd_b, ptr+4);
  
  	return skb;
  }
  
  static int smsc95xx_manage_power(struct usbnet *dev, int on)
  {
  	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
  
  	dev->intf->needs_remote_wakeup = on;
  
  	if (pdata->features & FEATURE_REMOTE_WAKEUP)
  		return 0;
  
  	/* this chip revision isn't capable of remote wakeup */
  	netdev_info(dev->net, "hardware isn't capable of remote wakeup\n");
  
  	if (on)
  		usb_autopm_get_interface_no_resume(dev->intf);
  	else
  		usb_autopm_put_interface(dev->intf);
  
  	return 0;
  }
  
  static const struct driver_info smsc95xx_info = {
  	.description	= "smsc95xx USB 2.0 Ethernet",
  	.bind		= smsc95xx_bind,
  	.unbind		= smsc95xx_unbind,
  	.link_reset	= smsc95xx_link_reset,
  	.reset		= smsc95xx_reset,
  	.rx_fixup	= smsc95xx_rx_fixup,
  	.tx_fixup	= smsc95xx_tx_fixup,
  	.status		= smsc95xx_status,
  	.manage_power	= smsc95xx_manage_power,
  	.flags		= FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
  };
  
  static const struct usb_device_id products[] = {
  	{
  		/* SMSC9500 USB Ethernet Device */
  		USB_DEVICE(0x0424, 0x9500),
  		.driver_info = (unsigned long) &smsc95xx_info,
  	},
  	{
  		/* SMSC9505 USB Ethernet Device */
  		USB_DEVICE(0x0424, 0x9505),
  		.driver_info = (unsigned long) &smsc95xx_info,
  	},
  	{
  		/* SMSC9500A USB Ethernet Device */
  		USB_DEVICE(0x0424, 0x9E00),
  		.driver_info = (unsigned long) &smsc95xx_info,
  	},
  	{
  		/* SMSC9505A USB Ethernet Device */
  		USB_DEVICE(0x0424, 0x9E01),
  		.driver_info = (unsigned long) &smsc95xx_info,
  	},
  	{
  		/* SMSC9512/9514 USB Hub & Ethernet Device */
  		USB_DEVICE(0x0424, 0xec00),
  		.driver_info = (unsigned long) &smsc95xx_info,
  	},
  	{
  		/* SMSC9500 USB Ethernet Device (SAL10) */
  		USB_DEVICE(0x0424, 0x9900),
  		.driver_info = (unsigned long) &smsc95xx_info,
  	},
  	{
  		/* SMSC9505 USB Ethernet Device (SAL10) */
  		USB_DEVICE(0x0424, 0x9901),
  		.driver_info = (unsigned long) &smsc95xx_info,
  	},
  	{
  		/* SMSC9500A USB Ethernet Device (SAL10) */
  		USB_DEVICE(0x0424, 0x9902),
  		.driver_info = (unsigned long) &smsc95xx_info,
  	},
  	{
  		/* SMSC9505A USB Ethernet Device (SAL10) */
  		USB_DEVICE(0x0424, 0x9903),
  		.driver_info = (unsigned long) &smsc95xx_info,
  	},
  	{
  		/* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
  		USB_DEVICE(0x0424, 0x9904),
  		.driver_info = (unsigned long) &smsc95xx_info,
  	},
  	{
  		/* SMSC9500A USB Ethernet Device (HAL) */
  		USB_DEVICE(0x0424, 0x9905),
  		.driver_info = (unsigned long) &smsc95xx_info,
  	},
  	{
  		/* SMSC9505A USB Ethernet Device (HAL) */
  		USB_DEVICE(0x0424, 0x9906),
  		.driver_info = (unsigned long) &smsc95xx_info,
  	},
  	{
  		/* SMSC9500 USB Ethernet Device (Alternate ID) */
  		USB_DEVICE(0x0424, 0x9907),
  		.driver_info = (unsigned long) &smsc95xx_info,
  	},
  	{
  		/* SMSC9500A USB Ethernet Device (Alternate ID) */
  		USB_DEVICE(0x0424, 0x9908),
  		.driver_info = (unsigned long) &smsc95xx_info,
  	},
  	{
  		/* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
  		USB_DEVICE(0x0424, 0x9909),
  		.driver_info = (unsigned long) &smsc95xx_info,
  	},
  	{
  		/* SMSC LAN9530 USB Ethernet Device */
  		USB_DEVICE(0x0424, 0x9530),
  		.driver_info = (unsigned long) &smsc95xx_info,
  	},
  	{
  		/* SMSC LAN9730 USB Ethernet Device */
  		USB_DEVICE(0x0424, 0x9730),
  		.driver_info = (unsigned long) &smsc95xx_info,
  	},
  	{
  		/* SMSC LAN89530 USB Ethernet Device */
  		USB_DEVICE(0x0424, 0x9E08),
  		.driver_info = (unsigned long) &smsc95xx_info,
  	},
  	{ },		/* END */
  };
  MODULE_DEVICE_TABLE(usb, products);
  
  static struct usb_driver smsc95xx_driver = {
  	.name		= "smsc95xx",
  	.id_table	= products,
  	.probe		= usbnet_probe,
  	.suspend	= smsc95xx_suspend,
  	.resume		= smsc95xx_resume,
  	.reset_resume	= smsc95xx_reset_resume,
  	.disconnect	= usbnet_disconnect,
  	.disable_hub_initiated_lpm = 1,
  	.supports_autosuspend = 1,
  };
  
  module_usb_driver(smsc95xx_driver);
  
  MODULE_AUTHOR("Nancy Lin");
  MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
  MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
  MODULE_LICENSE("GPL");
  