text: /*
   *  Copyright (c) 2002 Petko Manolov (petkan@users.sourceforge.net)
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * version 2 as published by the Free Software Foundation.
   */
  
  #include <linux/signal.h>
  #include <linux/slab.h>
  #include <linux/module.h>
  #include <linux/netdevice.h>
  #include <linux/etherdevice.h>
  #include <linux/mii.h>
  #include <linux/ethtool.h>
  #include <linux/usb.h>
  #include <asm/uaccess.h>
  
  /* Version Information */
  #define DRIVER_VERSION "v0.6.2 (2004/08/27)"
  #define DRIVER_AUTHOR "Petko Manolov <petkan@users.sourceforge.net>"
  #define DRIVER_DESC "rtl8150 based usb-ethernet driver"
  
  #define	IDR			0x0120
  #define	MAR			0x0126
  #define	CR			0x012e
  #define	TCR			0x012f
  #define	RCR			0x0130
  #define	TSR			0x0132
  #define	RSR			0x0133
  #define	CON0			0x0135
  #define	CON1			0x0136
  #define	MSR			0x0137
  #define	PHYADD			0x0138
  #define	PHYDAT			0x0139
  #define	PHYCNT			0x013b
  #define	GPPC			0x013d
  #define	BMCR			0x0140
  #define	BMSR			0x0142
  #define	ANAR			0x0144
  #define	ANLP			0x0146
  #define	AER			0x0148
  #define CSCR			0x014C  /* This one has the link status */
  #define CSCR_LINK_STATUS	(1 << 3)
  
  #define	IDR_EEPROM		0x1202
  
  #define	PHY_READ		0
  #define	PHY_WRITE		0x20
  #define	PHY_GO			0x40
  
  #define	MII_TIMEOUT		10
  #define	INTBUFSIZE		8
  
  #define	RTL8150_REQT_READ	0xc0
  #define	RTL8150_REQT_WRITE	0x40
  #define	RTL8150_REQ_GET_REGS	0x05
  #define	RTL8150_REQ_SET_REGS	0x05
  
  
  /* Transmit status register errors */
  #define TSR_ECOL		(1<<5)
  #define TSR_LCOL		(1<<4)
  #define TSR_LOSS_CRS		(1<<3)
  #define TSR_JBR			(1<<2)
  #define TSR_ERRORS		(TSR_ECOL | TSR_LCOL | TSR_LOSS_CRS | TSR_JBR)
  /* Receive status register errors */
  #define RSR_CRC			(1<<2)
  #define RSR_FAE			(1<<1)
  #define RSR_ERRORS		(RSR_CRC | RSR_FAE)
  
  /* Media status register definitions */
  #define MSR_DUPLEX		(1<<4)
  #define MSR_SPEED		(1<<3)
  #define MSR_LINK		(1<<2)
  
  /* Interrupt pipe data */
  #define INT_TSR			0x00
  #define INT_RSR			0x01
  #define INT_MSR			0x02
  #define INT_WAKSR		0x03
  #define INT_TXOK_CNT		0x04
  #define INT_RXLOST_CNT		0x05
  #define INT_CRERR_CNT		0x06
  #define INT_COL_CNT		0x07
  
  
  #define	RTL8150_MTU		1540
  #define	RTL8150_TX_TIMEOUT	(HZ)
  #define	RX_SKB_POOL_SIZE	4
  
  /* rtl8150 flags */
  #define	RTL8150_HW_CRC		0
  #define	RX_REG_SET		1
  #define	RTL8150_UNPLUG		2
  #define	RX_URB_FAIL		3
  
  /* Define these values to match your device */
  #define	VENDOR_ID_REALTEK		0x0bda
  #define	VENDOR_ID_MELCO			0x0411
  #define	VENDOR_ID_MICRONET		0x3980
  #define	VENDOR_ID_LONGSHINE		0x07b8
  #define	VENDOR_ID_OQO			0x1557
  #define	VENDOR_ID_ZYXEL			0x0586
  
  #define PRODUCT_ID_RTL8150		0x8150
  #define	PRODUCT_ID_LUAKTX		0x0012
  #define	PRODUCT_ID_LCS8138TX		0x401a
  #define PRODUCT_ID_SP128AR		0x0003
  #define	PRODUCT_ID_PRESTIGE		0x401a
  
  #undef	EEPROM_WRITE
  
  /* table of devices that work with this driver */
  static struct usb_device_id rtl8150_table[] = {
  	{USB_DEVICE(VENDOR_ID_REALTEK, PRODUCT_ID_RTL8150)},
  	{USB_DEVICE(VENDOR_ID_MELCO, PRODUCT_ID_LUAKTX)},
  	{USB_DEVICE(VENDOR_ID_MICRONET, PRODUCT_ID_SP128AR)},
  	{USB_DEVICE(VENDOR_ID_LONGSHINE, PRODUCT_ID_LCS8138TX)},
  	{USB_DEVICE(VENDOR_ID_OQO, PRODUCT_ID_RTL8150)},
  	{USB_DEVICE(VENDOR_ID_ZYXEL, PRODUCT_ID_PRESTIGE)},
  	{}
  };
  
  MODULE_DEVICE_TABLE(usb, rtl8150_table);
  
  struct rtl8150 {
  	unsigned long flags;
  	struct usb_device *udev;
  	struct tasklet_struct tl;
  	struct net_device *netdev;
  	struct urb *rx_urb, *tx_urb, *intr_urb;
  	struct sk_buff *tx_skb, *rx_skb;
  	struct sk_buff *rx_skb_pool[RX_SKB_POOL_SIZE];
  	spinlock_t rx_pool_lock;
  	struct usb_ctrlrequest dr;
  	int intr_interval;
  	u8 *intr_buff;
  	u8 phy;
  };
  
  typedef struct rtl8150 rtl8150_t;
  
  struct async_req {
  	struct usb_ctrlrequest dr;
  	u16 rx_creg;
  };
  
  static const char driver_name [] = "rtl8150";
  
  /*
  **
  **	device related part of the code
  **
  */
  static int get_registers(rtl8150_t * dev, u16 indx, u16 size, void *data)
  {
  	void *buf;
  	int ret;
  
  	buf = kmalloc(size, GFP_NOIO);
  	if (!buf)
  		return -ENOMEM;
  
  	ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
  			      RTL8150_REQ_GET_REGS, RTL8150_REQT_READ,
  			      indx, 0, buf, size, 500);
  	if (ret > 0 && ret <= size)
  		memcpy(data, buf, ret);
  	kfree(buf);
  	return ret;
  }
  
  static int set_registers(rtl8150_t * dev, u16 indx, u16 size, const void *data)
  {
  	void *buf;
  	int ret;
  
  	buf = kmemdup(data, size, GFP_NOIO);
  	if (!buf)
  		return -ENOMEM;
  
  	ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
  			      RTL8150_REQ_SET_REGS, RTL8150_REQT_WRITE,
  			      indx, 0, buf, size, 500);
  	kfree(buf);
  	return ret;
  }
  
  static void async_set_reg_cb(struct urb *urb)
  {
  	struct async_req *req = (struct async_req *)urb->context;
  	int status = urb->status;
  
  	if (status < 0)
  		dev_dbg(&urb->dev->dev, "%s failed with %d", __func__, status);
  	kfree(req);
  	usb_free_urb(urb);
  }
  
  static int async_set_registers(rtl8150_t *dev, u16 indx, u16 size, u16 reg)
  {
  	int res = -ENOMEM;
  	struct urb *async_urb;
  	struct async_req *req;
  
  	req = kmalloc(sizeof(struct async_req), GFP_ATOMIC);
  	if (req == NULL)
  		return res;
  	async_urb = usb_alloc_urb(0, GFP_ATOMIC);
  	if (async_urb == NULL) {
  		kfree(req);
  		return res;
  	}
  	req->rx_creg = cpu_to_le16(reg);
  	req->dr.bRequestType = RTL8150_REQT_WRITE;
  	req->dr.bRequest = RTL8150_REQ_SET_REGS;
  	req->dr.wIndex = 0;
  	req->dr.wValue = cpu_to_le16(indx);
  	req->dr.wLength = cpu_to_le16(size);
  	usb_fill_control_urb(async_urb, dev->udev,
  	                     usb_sndctrlpipe(dev->udev, 0), (void *)&req->dr,
  			     &req->rx_creg, size, async_set_reg_cb, req);
  	res = usb_submit_urb(async_urb, GFP_ATOMIC);
  	if (res) {
  		if (res == -ENODEV)
  			netif_device_detach(dev->netdev);
  		dev_err(&dev->udev->dev, "%s failed with %d\n", __func__, res);
  	}
  	return res;
  }
  
  static int read_mii_word(rtl8150_t * dev, u8 phy, __u8 indx, u16 * reg)
  {
  	int i;
  	u8 data[3], tmp;
  
  	data[0] = phy;
  	data[1] = data[2] = 0;
  	tmp = indx | PHY_READ | PHY_GO;
  	i = 0;
  
  	set_registers(dev, PHYADD, sizeof(data), data);
  	set_registers(dev, PHYCNT, 1, &tmp);
  	do {
  		get_registers(dev, PHYCNT, 1, data);
  	} while ((data[0] & PHY_GO) && (i++ < MII_TIMEOUT));
  
  	if (i <= MII_TIMEOUT) {
  		get_registers(dev, PHYDAT, 2, data);
  		*reg = data[0] | (data[1] << 8);
  		return 0;
  	} else
  		return 1;
  }
  
  static int write_mii_word(rtl8150_t * dev, u8 phy, __u8 indx, u16 reg)
  {
  	int i;
  	u8 data[3], tmp;
  
  	data[0] = phy;
  	data[1] = reg & 0xff;
  	data[2] = (reg >> 8) & 0xff;
  	tmp = indx | PHY_WRITE | PHY_GO;
  	i = 0;
  
  	set_registers(dev, PHYADD, sizeof(data), data);
  	set_registers(dev, PHYCNT, 1, &tmp);
  	do {
  		get_registers(dev, PHYCNT, 1, data);
  	} while ((data[0] & PHY_GO) && (i++ < MII_TIMEOUT));
  
  	if (i <= MII_TIMEOUT)
  		return 0;
  	else
  		return 1;
  }
  
  static inline void set_ethernet_addr(rtl8150_t * dev)
  {
  	u8 node_id[6];
  
  	get_registers(dev, IDR, sizeof(node_id), node_id);
  	memcpy(dev->netdev->dev_addr, node_id, sizeof(node_id));
  }
  
  static int rtl8150_set_mac_address(struct net_device *netdev, void *p)
  {
  	struct sockaddr *addr = p;
  	rtl8150_t *dev = netdev_priv(netdev);
  
  	if (netif_running(netdev))
  		return -EBUSY;
  
  	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
  	netdev_dbg(netdev, "Setting MAC address to %pM\n", netdev->dev_addr);
  	/* Set the IDR registers. */
  	set_registers(dev, IDR, netdev->addr_len, netdev->dev_addr);
  #ifdef EEPROM_WRITE
  	{
  	int i;
  	u8 cr;
  	/* Get the CR contents. */
  	get_registers(dev, CR, 1, &cr);
  	/* Set the WEPROM bit (eeprom write enable). */
  	cr |= 0x20;
  	set_registers(dev, CR, 1, &cr);
  	/* Write the MAC address into eeprom. Eeprom writes must be word-sized,
  	   so we need to split them up. */
  	for (i = 0; i * 2 < netdev->addr_len; i++) {
  		set_registers(dev, IDR_EEPROM + (i * 2), 2,
  		netdev->dev_addr + (i * 2));
  	}
  	/* Clear the WEPROM bit (preventing accidental eeprom writes). */
  	cr &= 0xdf;
  	set_registers(dev, CR, 1, &cr);
  	}
  #endif
  	return 0;
  }
  
  static int rtl8150_reset(rtl8150_t * dev)
  {
  	u8 data = 0x10;
  	int i = HZ;
  
  	set_registers(dev, CR, 1, &data);
  	do {
  		get_registers(dev, CR, 1, &data);
  	} while ((data & 0x10) && --i);
  
  	return (i > 0) ? 1 : 0;
  }
  
  static int alloc_all_urbs(rtl8150_t * dev)
  {
  	dev->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
  	if (!dev->rx_urb)
  		return 0;
  	dev->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
  	if (!dev->tx_urb) {
  		usb_free_urb(dev->rx_urb);
  		return 0;
  	}
  	dev->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
  	if (!dev->intr_urb) {
  		usb_free_urb(dev->rx_urb);
  		usb_free_urb(dev->tx_urb);
  		return 0;
  	}
  
  	return 1;
  }
  
  static void free_all_urbs(rtl8150_t * dev)
  {
  	usb_free_urb(dev->rx_urb);
  	usb_free_urb(dev->tx_urb);
  	usb_free_urb(dev->intr_urb);
  }
  
  static void unlink_all_urbs(rtl8150_t * dev)
  {
  	usb_kill_urb(dev->rx_urb);
  	usb_kill_urb(dev->tx_urb);
  	usb_kill_urb(dev->intr_urb);
  }
  
  static inline struct sk_buff *pull_skb(rtl8150_t *dev)
  {
  	struct sk_buff *skb;
  	int i;
  
  	for (i = 0; i < RX_SKB_POOL_SIZE; i++) {
  		if (dev->rx_skb_pool[i]) {
  			skb = dev->rx_skb_pool[i];
  			dev->rx_skb_pool[i] = NULL;
  			return skb;
  		}
  	}
  	return NULL;
  }
  
  static void read_bulk_callback(struct urb *urb)
  {
  	rtl8150_t *dev;
  	unsigned pkt_len, res;
  	struct sk_buff *skb;
  	struct net_device *netdev;
  	u16 rx_stat;
  	int status = urb->status;
  	int result;
  
  	dev = urb->context;
  	if (!dev)
  		return;
  	if (test_bit(RTL8150_UNPLUG, &dev->flags))
  		return;
  	netdev = dev->netdev;
  	if (!netif_device_present(netdev))
  		return;
  
  	switch (status) {
  	case 0:
  		break;
  	case -ENOENT:
  		return;	/* the urb is in unlink state */
  	case -ETIME:
  		if (printk_ratelimit())
  			dev_warn(&urb->dev->dev, "may be reset is needed?..\n");
  		goto goon;
  	default:
  		if (printk_ratelimit())
  			dev_warn(&urb->dev->dev, "Rx status %d\n", status);
  		goto goon;
  	}
  
  	if (!dev->rx_skb)
  		goto resched;
  	/* protect against short packets (tell me why we got some?!?) */
  	if (urb->actual_length < 4)
  		goto goon;
  
  	res = urb->actual_length;
  	rx_stat = le16_to_cpu(*(__le16 *)(urb->transfer_buffer + res - 4));
  	pkt_len = res - 4;
  
  	skb_put(dev->rx_skb, pkt_len);
  	dev->rx_skb->protocol = eth_type_trans(dev->rx_skb, netdev);
  	netif_rx(dev->rx_skb);
  	netdev->stats.rx_packets++;
  	netdev->stats.rx_bytes += pkt_len;
  
  	spin_lock(&dev->rx_pool_lock);
  	skb = pull_skb(dev);
  	spin_unlock(&dev->rx_pool_lock);
  	if (!skb)
  		goto resched;
  
  	dev->rx_skb = skb;
  goon:
  	usb_fill_bulk_urb(dev->rx_urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
  		      dev->rx_skb->data, RTL8150_MTU, read_bulk_callback, dev);
  	result = usb_submit_urb(dev->rx_urb, GFP_ATOMIC);
  	if (result == -ENODEV)
  		netif_device_detach(dev->netdev);
  	else if (result) {
  		set_bit(RX_URB_FAIL, &dev->flags);
  		goto resched;
  	} else {
  		clear_bit(RX_URB_FAIL, &dev->flags);
  	}
  
  	return;
  resched:
  	tasklet_schedule(&dev->tl);
  }
  
  static void write_bulk_callback(struct urb *urb)
  {
  	rtl8150_t *dev;
  	int status = urb->status;
  
  	dev = urb->context;
  	if (!dev)
  		return;
  	dev_kfree_skb_irq(dev->tx_skb);
  	if (!netif_device_present(dev->netdev))
  		return;
  	if (status)
  		dev_info(&urb->dev->dev, "%s: Tx status %d\n",
  			 dev->netdev->name, status);
  	dev->netdev->trans_start = jiffies;
  	netif_wake_queue(dev->netdev);
  }
  
  static void intr_callback(struct urb *urb)
  {
  	rtl8150_t *dev;
  	__u8 *d;
  	int status = urb->status;
  	int res;
  
  	dev = urb->context;
  	if (!dev)
  		return;
  	switch (status) {
  	case 0:			/* success */
  		break;
  	case -ECONNRESET:	/* unlink */
  	case -ENOENT:
  	case -ESHUTDOWN:
  		return;
  	/* -EPIPE:  should clear the halt */
  	default:
  		dev_info(&urb->dev->dev, "%s: intr status %d\n",
  			 dev->netdev->name, status);
  		goto resubmit;
  	}
  
  	d = urb->transfer_buffer;
  	if (d[0] & TSR_ERRORS) {
  		dev->netdev->stats.tx_errors++;
  		if (d[INT_TSR] & (TSR_ECOL | TSR_JBR))
  			dev->netdev->stats.tx_aborted_errors++;
  		if (d[INT_TSR] & TSR_LCOL)
  			dev->netdev->stats.tx_window_errors++;
  		if (d[INT_TSR] & TSR_LOSS_CRS)
  			dev->netdev->stats.tx_carrier_errors++;
  	}
  	/* Report link status changes to the network stack */
  	if ((d[INT_MSR] & MSR_LINK) == 0) {
  		if (netif_carrier_ok(dev->netdev)) {
  			netif_carrier_off(dev->netdev);
  			netdev_dbg(dev->netdev, "%s: LINK LOST\n", __func__);
  		}
  	} else {
  		if (!netif_carrier_ok(dev->netdev)) {
  			netif_carrier_on(dev->netdev);
  			netdev_dbg(dev->netdev, "%s: LINK CAME BACK\n", __func__);
  		}
  	}
  
  resubmit:
  	res = usb_submit_urb (urb, GFP_ATOMIC);
  	if (res == -ENODEV)
  		netif_device_detach(dev->netdev);
  	else if (res)
  		dev_err(&dev->udev->dev,
  			"can't resubmit intr, %s-%s/input0, status %d\n",
  			dev->udev->bus->bus_name, dev->udev->devpath, res);
  }
  
  static int rtl8150_suspend(struct usb_interface *intf, pm_message_t message)
  {
  	rtl8150_t *dev = usb_get_intfdata(intf);
  
  	netif_device_detach(dev->netdev);
  
  	if (netif_running(dev->netdev)) {
  		usb_kill_urb(dev->rx_urb);
  		usb_kill_urb(dev->intr_urb);
  	}
  	return 0;
  }
  
  static int rtl8150_resume(struct usb_interface *intf)
  {
  	rtl8150_t *dev = usb_get_intfdata(intf);
  
  	netif_device_attach(dev->netdev);
  	if (netif_running(dev->netdev)) {
  		dev->rx_urb->status = 0;
  		dev->rx_urb->actual_length = 0;
  		read_bulk_callback(dev->rx_urb);
  
  		dev->intr_urb->status = 0;
  		dev->intr_urb->actual_length = 0;
  		intr_callback(dev->intr_urb);
  	}
  	return 0;
  }
  
  /*
  **
  **	network related part of the code
  **
  */
  
  static void fill_skb_pool(rtl8150_t *dev)
  {
  	struct sk_buff *skb;
  	int i;
  
  	for (i = 0; i < RX_SKB_POOL_SIZE; i++) {
  		if (dev->rx_skb_pool[i])
  			continue;
  		skb = dev_alloc_skb(RTL8150_MTU + 2);
  		if (!skb) {
  			return;
  		}
  		skb_reserve(skb, 2);
  		dev->rx_skb_pool[i] = skb;
  	}
  }
  
  static void free_skb_pool(rtl8150_t *dev)
  {
  	int i;
  
  	for (i = 0; i < RX_SKB_POOL_SIZE; i++)
  		if (dev->rx_skb_pool[i])
  			dev_kfree_skb(dev->rx_skb_pool[i]);
  }
  
  static void rx_fixup(unsigned long data)
  {
  	struct rtl8150 *dev = (struct rtl8150 *)data;
  	struct sk_buff *skb;
  	int status;
  
  	spin_lock_irq(&dev->rx_pool_lock);
  	fill_skb_pool(dev);
  	spin_unlock_irq(&dev->rx_pool_lock);
  	if (test_bit(RX_URB_FAIL, &dev->flags))
  		if (dev->rx_skb)
  			goto try_again;
  	spin_lock_irq(&dev->rx_pool_lock);
  	skb = pull_skb(dev);
  	spin_unlock_irq(&dev->rx_pool_lock);
  	if (skb == NULL)
  		goto tlsched;
  	dev->rx_skb = skb;
  	usb_fill_bulk_urb(dev->rx_urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
  		      dev->rx_skb->data, RTL8150_MTU, read_bulk_callback, dev);
  try_again:
  	status = usb_submit_urb(dev->rx_urb, GFP_ATOMIC);
  	if (status == -ENODEV) {
  		netif_device_detach(dev->netdev);
  	} else if (status) {
  		set_bit(RX_URB_FAIL, &dev->flags);
  		goto tlsched;
  	} else {
  		clear_bit(RX_URB_FAIL, &dev->flags);
  	}
  
  	return;
  tlsched:
  	tasklet_schedule(&dev->tl);
  }
  
  static int enable_net_traffic(rtl8150_t * dev)
  {
  	u8 cr, tcr, rcr, msr;
  
  	if (!rtl8150_reset(dev)) {
  		dev_warn(&dev->udev->dev, "device reset failed\n");
  	}
  	/* RCR bit7=1 attach Rx info at the end;  =0 HW CRC (which is broken) */
  	rcr = 0x9e;
  	tcr = 0xd8;
  	cr = 0x0c;
  	if (!(rcr & 0x80))
  		set_bit(RTL8150_HW_CRC, &dev->flags);
  	set_registers(dev, RCR, 1, &rcr);
  	set_registers(dev, TCR, 1, &tcr);
  	set_registers(dev, CR, 1, &cr);
  	get_registers(dev, MSR, 1, &msr);
  
  	return 0;
  }
  
  static void disable_net_traffic(rtl8150_t * dev)
  {
  	u8 cr;
  
  	get_registers(dev, CR, 1, &cr);
  	cr &= 0xf3;
  	set_registers(dev, CR, 1, &cr);
  }
  
  static void rtl8150_tx_timeout(struct net_device *netdev)
  {
  	rtl8150_t *dev = netdev_priv(netdev);
  	dev_warn(&netdev->dev, "Tx timeout.\n");
  	usb_unlink_urb(dev->tx_urb);
  	netdev->stats.tx_errors++;
  }
  
  static void rtl8150_set_multicast(struct net_device *netdev)
  {
  	rtl8150_t *dev = netdev_priv(netdev);
  	u16 rx_creg = 0x9e;
  
  	netif_stop_queue(netdev);
  	if (netdev->flags & IFF_PROMISC) {
  		rx_creg |= 0x0001;
  		dev_info(&netdev->dev, "%s: promiscuous mode\n", netdev->name);
  	} else if (!netdev_mc_empty(netdev) ||
  		   (netdev->flags & IFF_ALLMULTI)) {
  		rx_creg &= 0xfffe;
  		rx_creg |= 0x0002;
  		dev_dbg(&netdev->dev, "%s: allmulti set\n", netdev->name);
  	} else {
  		/* ~RX_MULTICAST, ~RX_PROMISCUOUS */
  		rx_creg &= 0x00fc;
  	}
  	async_set_registers(dev, RCR, sizeof(rx_creg), rx_creg);
  	netif_wake_queue(netdev);
  }
  
  static netdev_tx_t rtl8150_start_xmit(struct sk_buff *skb,
  					    struct net_device *netdev)
  {
  	rtl8150_t *dev = netdev_priv(netdev);
  	int count, res;
  
  	netif_stop_queue(netdev);
  	count = (skb->len < 60) ? 60 : skb->len;
  	count = (count & 0x3f) ? count : count + 1;
  	dev->tx_skb = skb;
  	usb_fill_bulk_urb(dev->tx_urb, dev->udev, usb_sndbulkpipe(dev->udev, 2),
  		      skb->data, count, write_bulk_callback, dev);
  	if ((res = usb_submit_urb(dev->tx_urb, GFP_ATOMIC))) {
  		/* Can we get/handle EPIPE here? */
  		if (res == -ENODEV)
  			netif_device_detach(dev->netdev);
  		else {
  			dev_warn(&netdev->dev, "failed tx_urb %d\n", res);
  			netdev->stats.tx_errors++;
  			netif_start_queue(netdev);
  		}
  	} else {
  		netdev->stats.tx_packets++;
  		netdev->stats.tx_bytes += skb->len;
  		netdev->trans_start = jiffies;
  	}
  
  	return NETDEV_TX_OK;
  }
  
  
  static void set_carrier(struct net_device *netdev)
  {
  	rtl8150_t *dev = netdev_priv(netdev);
  	short tmp;
  
  	get_registers(dev, CSCR, 2, &tmp);
  	if (tmp & CSCR_LINK_STATUS)
  		netif_carrier_on(netdev);
  	else
  		netif_carrier_off(netdev);
  }
  
  static int rtl8150_open(struct net_device *netdev)
  {
  	rtl8150_t *dev = netdev_priv(netdev);
  	int res;
  
  	if (dev->rx_skb == NULL)
  		dev->rx_skb = pull_skb(dev);
  	if (!dev->rx_skb)
  		return -ENOMEM;
  
  	set_registers(dev, IDR, 6, netdev->dev_addr);
  
  	usb_fill_bulk_urb(dev->rx_urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
  		      dev->rx_skb->data, RTL8150_MTU, read_bulk_callback, dev);
  	if ((res = usb_submit_urb(dev->rx_urb, GFP_KERNEL))) {
  		if (res == -ENODEV)
  			netif_device_detach(dev->netdev);
  		dev_warn(&netdev->dev, "rx_urb submit failed: %d\n", res);
  		return res;
  	}
  	usb_fill_int_urb(dev->intr_urb, dev->udev, usb_rcvintpipe(dev->udev, 3),
  		     dev->intr_buff, INTBUFSIZE, intr_callback,
  		     dev, dev->intr_interval);
  	if ((res = usb_submit_urb(dev->intr_urb, GFP_KERNEL))) {
  		if (res == -ENODEV)
  			netif_device_detach(dev->netdev);
  		dev_warn(&netdev->dev, "intr_urb submit failed: %d\n", res);
  		usb_kill_urb(dev->rx_urb);
  		return res;
  	}
  	enable_net_traffic(dev);
  	set_carrier(netdev);
  	netif_start_queue(netdev);
  
  	return res;
  }
  
  static int rtl8150_close(struct net_device *netdev)
  {
  	rtl8150_t *dev = netdev_priv(netdev);
  	int res = 0;
  
  	netif_stop_queue(netdev);
  	if (!test_bit(RTL8150_UNPLUG, &dev->flags))
  		disable_net_traffic(dev);
  	unlink_all_urbs(dev);
  
  	return res;
  }
  
  static void rtl8150_get_drvinfo(struct net_device *netdev, struct ethtool_drvinfo *info)
  {
  	rtl8150_t *dev = netdev_priv(netdev);
  
  	strlcpy(info->driver, driver_name, sizeof(info->driver));
  	strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
  	usb_make_path(dev->udev, info->bus_info, sizeof(info->bus_info));
  }
  
  static int rtl8150_get_settings(struct net_device *netdev, struct ethtool_cmd *ecmd)
  {
  	rtl8150_t *dev = netdev_priv(netdev);
  	short lpa, bmcr;
  
  	ecmd->supported = (SUPPORTED_10baseT_Half |
  			  SUPPORTED_10baseT_Full |
  			  SUPPORTED_100baseT_Half |
  			  SUPPORTED_100baseT_Full |
  			  SUPPORTED_Autoneg |
  			  SUPPORTED_TP | SUPPORTED_MII);
  	ecmd->port = PORT_TP;
  	ecmd->transceiver = XCVR_INTERNAL;
  	ecmd->phy_address = dev->phy;
  	get_registers(dev, BMCR, 2, &bmcr);
  	get_registers(dev, ANLP, 2, &lpa);
  	if (bmcr & BMCR_ANENABLE) {
  		u32 speed = ((lpa & (LPA_100HALF | LPA_100FULL)) ?
  			     SPEED_100 : SPEED_10);
  		ethtool_cmd_speed_set(ecmd, speed);
  		ecmd->autoneg = AUTONEG_ENABLE;
  		if (speed == SPEED_100)
  			ecmd->duplex = (lpa & LPA_100FULL) ?
  			    DUPLEX_FULL : DUPLEX_HALF;
  		else
  			ecmd->duplex = (lpa & LPA_10FULL) ?
  			    DUPLEX_FULL : DUPLEX_HALF;
  	} else {
  		ecmd->autoneg = AUTONEG_DISABLE;
  		ethtool_cmd_speed_set(ecmd, ((bmcr & BMCR_SPEED100) ?
  					     SPEED_100 : SPEED_10));
  		ecmd->duplex = (bmcr & BMCR_FULLDPLX) ?
  		    DUPLEX_FULL : DUPLEX_HALF;
  	}
  	return 0;
  }
  
  static const struct ethtool_ops ops = {
  	.get_drvinfo = rtl8150_get_drvinfo,
  	.get_settings = rtl8150_get_settings,
  	.get_link = ethtool_op_get_link
  };
  
  static int rtl8150_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
  {
  	rtl8150_t *dev = netdev_priv(netdev);
  	u16 *data = (u16 *) & rq->ifr_ifru;
  	int res = 0;
  
  	switch (cmd) {
  	case SIOCDEVPRIVATE:
  		data[0] = dev->phy;
  	case SIOCDEVPRIVATE + 1:
  		read_mii_word(dev, dev->phy, (data[1] & 0x1f), &data[3]);
  		break;
  	case SIOCDEVPRIVATE + 2:
  		if (!capable(CAP_NET_ADMIN))
  			return -EPERM;
  		write_mii_word(dev, dev->phy, (data[1] & 0x1f), data[2]);
  		break;
  	default:
  		res = -EOPNOTSUPP;
  	}
  
  	return res;
  }
  
  static const struct net_device_ops rtl8150_netdev_ops = {
  	.ndo_open		= rtl8150_open,
  	.ndo_stop		= rtl8150_close,
  	.ndo_do_ioctl		= rtl8150_ioctl,
  	.ndo_start_xmit		= rtl8150_start_xmit,
  	.ndo_tx_timeout		= rtl8150_tx_timeout,
  	.ndo_set_rx_mode	= rtl8150_set_multicast,
  	.ndo_set_mac_address	= rtl8150_set_mac_address,
  
  	.ndo_change_mtu		= eth_change_mtu,
  	.ndo_validate_addr	= eth_validate_addr,
  };
  
  static int rtl8150_probe(struct usb_interface *intf,
  			 const struct usb_device_id *id)
  {
  	struct usb_device *udev = interface_to_usbdev(intf);
  	rtl8150_t *dev;
  	struct net_device *netdev;
  
  	netdev = alloc_etherdev(sizeof(rtl8150_t));
  	if (!netdev)
  		return -ENOMEM;
  
  	dev = netdev_priv(netdev);
  
  	dev->intr_buff = kmalloc(INTBUFSIZE, GFP_KERNEL);
  	if (!dev->intr_buff) {
  		free_netdev(netdev);
  		return -ENOMEM;
  	}
  
  	tasklet_init(&dev->tl, rx_fixup, (unsigned long)dev);
  	spin_lock_init(&dev->rx_pool_lock);
  
  	dev->udev = udev;
  	dev->netdev = netdev;
  	netdev->netdev_ops = &rtl8150_netdev_ops;
  	netdev->watchdog_timeo = RTL8150_TX_TIMEOUT;
  	netdev->ethtool_ops = &ops;
  	dev->intr_interval = 100;	/* 100ms */
  
  	if (!alloc_all_urbs(dev)) {
  		dev_err(&intf->dev, "out of memory\n");
  		goto out;
  	}
  	if (!rtl8150_reset(dev)) {
  		dev_err(&intf->dev, "couldn't reset the device\n");
  		goto out1;
  	}
  	fill_skb_pool(dev);
  	set_ethernet_addr(dev);
  
  	usb_set_intfdata(intf, dev);
  	SET_NETDEV_DEV(netdev, &intf->dev);
  	if (register_netdev(netdev) != 0) {
  		dev_err(&intf->dev, "couldn't register the device\n");
  		goto out2;
  	}
  
  	dev_info(&intf->dev, "%s: rtl8150 is detected\n", netdev->name);
  
  	return 0;
  
  out2:
  	usb_set_intfdata(intf, NULL);
  	free_skb_pool(dev);
  out1:
  	free_all_urbs(dev);
  out:
  	kfree(dev->intr_buff);
  	free_netdev(netdev);
  	return -EIO;
  }
  
  static void rtl8150_disconnect(struct usb_interface *intf)
  {
  	rtl8150_t *dev = usb_get_intfdata(intf);
  
  	usb_set_intfdata(intf, NULL);
  	if (dev) {
  		set_bit(RTL8150_UNPLUG, &dev->flags);
  		tasklet_kill(&dev->tl);
  		unregister_netdev(dev->netdev);
  		unlink_all_urbs(dev);
  		free_all_urbs(dev);
  		free_skb_pool(dev);
  		if (dev->rx_skb)
  			dev_kfree_skb(dev->rx_skb);
  		kfree(dev->intr_buff);
  		free_netdev(dev->netdev);
  	}
  }
  
  static struct usb_driver rtl8150_driver = {
  	.name		= driver_name,
  	.probe		= rtl8150_probe,
  	.disconnect	= rtl8150_disconnect,
  	.id_table	= rtl8150_table,
  	.suspend	= rtl8150_suspend,
  	.resume		= rtl8150_resume,
  	.disable_hub_initiated_lpm = 1,
  };
  
  module_usb_driver(rtl8150_driver);
  
  MODULE_AUTHOR(DRIVER_AUTHOR);
  MODULE_DESCRIPTION(DRIVER_DESC);
  MODULE_LICENSE("GPL");
  