rtl8150.c

linux-2.6.15.6

	}

	return;
resched:
	tasklet_schedule(&dev->tl);
}

static void rx_fixup(unsigned long data)
{
	rtl8150_t *dev;
	struct sk_buff *skb;

	dev = (rtl8150_t *)data;

	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:
	if (usb_submit_urb(dev->rx_urb, GFP_ATOMIC)) {
		set_bit(RX_URB_FAIL, &dev->flags);
		goto tlsched;
	 } else {
		clear_bit(RX_URB_FAIL, &dev->flags);
	}

	return;
tlsched:
	tasklet_schedule(&dev->tl);
}

static void write_bulk_callback(struct urb *urb, struct pt_regs *regs)
{
	rtl8150_t *dev;

	dev = urb->context;
	if (!dev)
		return;
	dev_kfree_skb_irq(dev->tx_skb);
	if (!netif_device_present(dev->netdev))
		return;
	if (urb->status)
		info("%s: Tx status %d", dev->netdev->name, urb->status);
	dev->netdev->trans_start = jiffies;
	netif_wake_queue(dev->netdev);
}

static void intr_callback(struct urb *urb, struct pt_regs *regs)
{
	rtl8150_t *dev;
	__u8 *d;
	int status;

	dev = urb->context;
	if (!dev)
		return;
	switch (urb->status) {
	case 0:			/* success */
		break;
	case -ECONNRESET:	/* unlink */
	case -ENOENT:
	case -ESHUTDOWN:
		return;
	/* -EPIPE:  should clear the halt */
	default:
		info("%s: intr status %d", dev->netdev->name, urb->status);
		goto resubmit;
	}

	d = urb->transfer_buffer;
	if (d[0] & TSR_ERRORS) {
		dev->stats.tx_errors++;
		if (d[INT_TSR] & (TSR_ECOL | TSR_JBR))
			dev->stats.tx_aborted_errors++;
		if (d[INT_TSR] & TSR_LCOL)
			dev->stats.tx_window_errors++;
		if (d[INT_TSR] & TSR_LOSS_CRS)
			dev->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);
			dbg("%s: LINK LOST\n", __func__);
		}
	} else {
		if (!netif_carrier_ok(dev->netdev)) {
			netif_carrier_on(dev->netdev);
			dbg("%s: LINK CAME BACK\n", __func__);
		}
	}

resubmit:
	status = usb_submit_urb (urb, SLAB_ATOMIC);
	if (status)
		err ("can't resubmit intr, %s-%s/input0, status %d",
				dev->udev->bus->bus_name,
				dev->udev->devpath, status);
}


/*
**
**	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->dev = dev->netdev;
		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 int enable_net_traffic(rtl8150_t * dev)
{
	u8 cr, tcr, rcr, msr;

	if (!rtl8150_reset(dev)) {
		warn("%s - device reset failed", __FUNCTION__);
	}
	/* RCR bit7=1 attach Rx info at the end;  =0 HW CRC (which is broken) */
	rcr = 0x9e;
	dev->rx_creg = cpu_to_le16(rcr);
	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 struct net_device_stats *rtl8150_netdev_stats(struct net_device *dev)
{
	return &((rtl8150_t *)netdev_priv(dev))->stats;
}

static void rtl8150_tx_timeout(struct net_device *netdev)
{
	rtl8150_t *dev = netdev_priv(netdev);
	warn("%s: Tx timeout.", netdev->name);
	usb_unlink_urb(dev->tx_urb);
	dev->stats.tx_errors++;
}

static void rtl8150_set_multicast(struct net_device *netdev)
{
	rtl8150_t *dev = netdev_priv(netdev);
	netif_stop_queue(netdev);
	if (netdev->flags & IFF_PROMISC) {
		dev->rx_creg |= cpu_to_le16(0x0001);
		info("%s: promiscuous mode", netdev->name);
	} else if (netdev->mc_count ||
		   (netdev->flags & IFF_ALLMULTI)) {
		dev->rx_creg &= cpu_to_le16(0xfffe);
		dev->rx_creg |= cpu_to_le16(0x0002);
		info("%s: allmulti set", netdev->name);
	} else {
		/* ~RX_MULTICAST, ~RX_PROMISCUOUS */
		dev->rx_creg &= cpu_to_le16(0x00fc);
	}
	async_set_registers(dev, RCR, 2);
	netif_wake_queue(netdev);
}

static int 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))) {
		warn("failed tx_urb %d\n", res);
		dev->stats.tx_errors++;
		netif_start_queue(netdev);
	} else {
		dev->stats.tx_packets++;
		dev->stats.tx_bytes += skb->len;
		netdev->trans_start = jiffies;
	}

	return 0;
}


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)))
		warn("%s: rx_urb submit failed: %d", __FUNCTION__, 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)))
		warn("%s: intr_urb submit failed: %d", __FUNCTION__, res);
	netif_start_queue(netdev);
	enable_net_traffic(dev);
	set_carrier(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);

	strncpy(info->driver, driver_name, ETHTOOL_BUSINFO_LEN);
	strncpy(info->version, DRIVER_VERSION, ETHTOOL_BUSINFO_LEN);
	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) {
		ecmd->autoneg = AUTONEG_ENABLE;
		ecmd->speed = (lpa & (LPA_100HALF | LPA_100FULL)) ?
			     SPEED_100 : SPEED_10;
		if (ecmd->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;
		ecmd->speed = (bmcr & BMCR_SPEED100) ?
		    SPEED_100 : SPEED_10;
		ecmd->duplex = (bmcr & BMCR_FULLDPLX) ?
		    DUPLEX_FULL : DUPLEX_HALF;
	}
	return 0;
}

static 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 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) {
		err("Out of memory");
		return -ENOMEM;
	}

	dev = netdev_priv(netdev);
	memset(dev, 0, sizeof(rtl8150_t));

	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;
	SET_MODULE_OWNER(netdev);
	netdev->open = rtl8150_open;
	netdev->stop = rtl8150_close;
	netdev->do_ioctl = rtl8150_ioctl;
	netdev->watchdog_timeo = RTL8150_TX_TIMEOUT;
	netdev->tx_timeout = rtl8150_tx_timeout;
	netdev->hard_start_xmit = rtl8150_start_xmit;
	netdev->set_multicast_list = rtl8150_set_multicast;
	netdev->set_mac_address = rtl8150_set_mac_address;
	netdev->get_stats = rtl8150_netdev_stats;
	netdev->mtu = RTL8150_MTU;
	SET_ETHTOOL_OPS(netdev, &ops);
	dev->intr_interval = 100;	/* 100ms */

	if (!alloc_all_urbs(dev)) {
		err("out of memory");
		goto out;
	}
	if (!rtl8150_reset(dev)) {
		err("couldn't reset the device");
		goto out1;
	}
	fill_skb_pool(dev);
	set_ethernet_addr(dev);
	info("%s: rtl8150 is detected", netdev->name);
	
	usb_set_intfdata(intf, dev);
	SET_NETDEV_DEV(netdev, &intf->dev);
	if (register_netdev(netdev) != 0) {
		err("couldn't register the device");
		goto out2;
	}
	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_disable(&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 int __init usb_rtl8150_init(void)
{
	info(DRIVER_DESC " " DRIVER_VERSION);
	return usb_register(&rtl8150_driver);
}

static void __exit usb_rtl8150_exit(void)
{
	usb_deregister(&rtl8150_driver);
}

module_init(usb_rtl8150_init);
module_exit(usb_rtl8150_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");