rtl8150.c

linux下的usb接口驱动程序

			break;
		case -ENOENT:
			return;
		default:
			info("%s: intr status %d", dev->netdev->name,
			     urb->status);
	}
}


/*
**
**	network related part of the code
**
*/


static int enable_net_traffic(rtl8150_t *dev)
{
	u8	cr, tcr, rcr, msr;

	if (rtl8150_reset(dev)) {
		warn("%s - device reset failed", __FUNCTION__);
	}
	dev->rx_creg = rcr = 0x9e;	/* bit7=1 attach Rx info at the end */
	tcr = 0xd8;
	cr = 0x0c;
	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 *)dev->priv)->stats;
}


static void rtl8150_tx_timeout(struct net_device *netdev)
{
	rtl8150_t	*dev;

	dev = netdev->priv;
	if (!dev)
		return;
	warn("%s: Tx timeout.", netdev->name);
	dev->tx_urb->transfer_flags |= USB_ASYNC_UNLINK;
	usb_unlink_urb(dev->tx_urb);
	dev->stats.tx_errors++;
}


static void rtl8150_set_multicast(struct net_device *netdev)
{
	rtl8150_t	*dev;

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


static int rtl8150_start_xmit(struct sk_buff *skb, struct net_device *netdev)
{
	rtl8150_t	*dev;
	int		count, res;

	netif_stop_queue(netdev);
	dev = netdev->priv;
	count = (skb->len < 60) ? 60 : skb->len;
	count = (count & 0x3f) ? count : count + 1;
	memcpy(dev->tx_buff, skb->data, skb->len);
	FILL_BULK_URB(dev->tx_urb, dev->udev, usb_sndbulkpipe(dev->udev,2),
		      dev->tx_buff, RTL8150_MAX_MTU, write_bulk_callback, dev);
	dev->tx_urb->transfer_buffer_length = count;

	if ((res = usb_submit_urb(dev->tx_urb))) {
		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;
	}
	dev_kfree_skb(skb);

	return 0;
}


static int rtl8150_open(struct net_device *netdev)
{
	rtl8150_t	*dev;
	int		res;
	
	dev = netdev->priv;
	if (dev == NULL) {
		return -ENODEV;
	}

	down(&dev->sem);
	FILL_BULK_URB(dev->rx_urb, dev->udev, usb_rcvbulkpipe(dev->udev,1),
			dev->rx_buff, RTL8150_MAX_MTU, read_bulk_callback, dev);
	if ((res=usb_submit_urb(dev->rx_urb)))
		warn("%s: rx_urb submit failed: %d", __FUNCTION__, res);
	FILL_INT_URB(dev->intr_urb, dev->udev, usb_rcvintpipe(dev->udev,3),
			dev->intr_buff, sizeof(dev->intr_buff), intr_callback,
			dev, dev->intr_interval);
	if ((res=usb_submit_urb(dev->intr_urb)))
		warn("%s: intr_urb submit failed: %d", __FUNCTION__, res);
	netif_start_queue(netdev);
	enable_net_traffic(dev);
	up(&dev->sem);

	return res;
}


static int rtl8150_close(struct net_device *netdev)
{
	rtl8150_t *dev;
	int res = 0;

	dev = netdev->priv;
	if (!dev)
		return -ENODEV;

	down(&dev->sem);
	if (!test_bit(RTL8150_UNPLUG, &dev->flags))
		disable_net_traffic(dev);
	unlink_all_urbs(dev);
	netif_stop_queue(netdev);
	up(&dev->sem);

	return res;
}


static int rtl8150_ethtool_ioctl(struct net_device *netdev, void *uaddr)
{
	rtl8150_t	*dev;
	int		cmd;
	char		tmp[128];

	dev = netdev->priv;
	if (get_user(cmd, (int *)uaddr))
		return -EFAULT;

	switch (cmd) {
	case ETHTOOL_GDRVINFO: {
		struct ethtool_drvinfo info = {ETHTOOL_GDRVINFO};
		
		strncpy(info.driver, DRIVER_DESC, ETHTOOL_BUSINFO_LEN);
		strncpy(info.version, DRIVER_VERSION, ETHTOOL_BUSINFO_LEN);
		sprintf(tmp, "usb%d:%d", dev->udev->bus->busnum,
		        dev->udev->devnum);
		strncpy(info.bus_info, tmp, ETHTOOL_BUSINFO_LEN);
		if (copy_to_user(uaddr, &info, sizeof(info)))
			return -EFAULT;
		return 0;
	}
	case ETHTOOL_GSET: {
		struct ethtool_cmd ecmd;
		short   lpa, bmcr;

		if (copy_from_user(&ecmd, uaddr, sizeof(ecmd)))
			return -EFAULT;
		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;
		}
		if (copy_to_user(uaddr, &ecmd, sizeof(ecmd)))
			return -EFAULT;
		return 0;
	}
	case ETHTOOL_SSET:
		return -ENOTSUPP;
	case ETHTOOL_GLINK: {
		struct ethtool_value edata = {ETHTOOL_GLINK};

		edata.data = netif_carrier_ok(netdev);
		if (copy_to_user(uaddr, &edata, sizeof(edata)))
			return -EFAULT;
		return 0;
	}
	default:
		return -EOPNOTSUPP;
	}
}


static int rtl8150_ioctl (struct net_device *netdev, struct ifreq *rq, int cmd)
{
	rtl8150_t *dev;
	u16	*data;
	int	res;

	dev = netdev->priv;
	data = (u16 *)&rq->ifr_data;
	res = 0;

	down(&dev->sem);
	switch (cmd) {
	case SIOCETHTOOL:
		res = rtl8150_ethtool_ioctl(netdev, rq->ifr_data);
		break;
	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)) {
			up(&dev->sem);
			return -EPERM;
		}
		write_mii_word(dev, dev->phy, (data[1] & 0x1f), data[2]);
		break;
	default:
		res = -EOPNOTSUPP;
	}
	up(&dev->sem);

	return res;
}


static void * rtl8150_probe(struct usb_device *udev, unsigned int ifnum,
			    const struct usb_device_id *id)
{
	rtl8150_t *dev;
	struct net_device *netdev;

	udev->config[0].bConfigurationValue = 1;
	if (usb_set_configuration(udev, udev->config[0].bConfigurationValue)) {
		err("usb_set_configuration() failed");
		return NULL;
	}
	if ((udev->descriptor.idVendor != VENDOR_ID_REALTEK) ||
	    (udev->descriptor.idProduct != PRODUCT_ID_RTL8150)) {
	    	err("Not the one we are interested about");
		return NULL;
	}
	dev = kmalloc(sizeof(rtl8150_t), GFP_KERNEL);
	if (!dev) {
		err ("Out of memory");
		goto exit;
	} else
		memset(dev, 0, sizeof(rtl8150_t));

	netdev = init_etherdev(NULL, 0);
	if (!netdev) {
		kfree(dev);
		err("Oh boy, out of memory again?!?");
		dev = NULL;
		goto exit;
	}
		
	init_MUTEX(&dev->sem);
	dev->udev = udev;
	dev->netdev = netdev;
	SET_MODULE_OWNER(netdev);
	netdev->priv = dev;
	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->get_stats = rtl8150_netdev_stats;
	netdev->mtu = RTL8150_MTU;
	dev->intr_interval = 100;	/* 100ms */

	if (rtl8150_reset(dev) || !alloc_all_urbs(dev)) {
		err("couldn't reset the device");
		free_all_urbs(dev);
		unregister_netdev(dev->netdev);
		kfree(netdev);
		kfree(dev);
		dev = NULL;
		goto exit;
	}

	set_ethernet_addr(dev);
	/* let's not be very nasty :-) */
	info("%s: rtl8150 is detected", netdev->name);
exit:
	return dev;
}


static void rtl8150_disconnect(struct usb_device *udev, void *ptr)
{
	rtl8150_t *dev;

	dev = ptr;
	set_bit(RTL8150_UNPLUG, &dev->flags);
	unregister_netdev(dev->netdev);
	unlink_all_urbs(dev);
	free_all_urbs(dev);
	kfree(dev->netdev);
	kfree(dev);
	dev->netdev = NULL;
	dev = NULL;
}



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");