[linux-2.6-block.git] / drivers / net / usb / mcs7830.c

/*
 * MOSCHIP MCS7830 based (7730/7830/7832) USB 2.0 Ethernet Devices
 *
 * based on usbnet.c, asix.c and the vendor provided mcs7830 driver
 *
 * Copyright (C) 2010 Andreas Mohr <andi@lisas.de>
 * Copyright (C) 2006 Arnd Bergmann <arnd@arndb.de>
 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
 * Copyright (C) 2005 Phil Chang <pchang23@sbcglobal.net>
 * Copyright (c) 2002-2003 TiVo Inc.
 *
 * Definitions gathered from MOSCHIP, Data Sheet_7830DA.pdf (thanks!).
 *
 * 2010-12-19: add 7832 USB PID ("functionality same as MCS7830"),
 *             per active notification by manufacturer
 *
 * TODO:
 * - support HIF_REG_CONFIG_SLEEPMODE/HIF_REG_CONFIG_TXENABLE (via autopm?)
 * - implement ethtool_ops get_pauseparam/set_pauseparam
 *   via HIF_REG_PAUSE_THRESHOLD (>= revision C only!)
 * - implement get_eeprom/[set_eeprom]
 * - switch PHY on/off on ifup/ifdown (perhaps in usbnet.c, via MII)
 * - mcs7830_get_regs() handling is weird: for rev 2 we return 32 regs,
 *   can access only ~ 24, remaining user buffer is uninitialized garbage
 * - anything else?
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/crc32.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/init.h>
#include <linux/mii.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/usbnet.h>

/* requests */
#define MCS7830_RD_BMREQ	(USB_DIR_IN  | USB_TYPE_VENDOR | \
				 USB_RECIP_DEVICE)
#define MCS7830_WR_BMREQ	(USB_DIR_OUT | USB_TYPE_VENDOR | \
				 USB_RECIP_DEVICE)
#define MCS7830_RD_BREQ		0x0E
#define MCS7830_WR_BREQ		0x0D

#define MCS7830_CTRL_TIMEOUT	1000
#define MCS7830_MAX_MCAST	64

#define MCS7830_VENDOR_ID	0x9710
#define MCS7832_PRODUCT_ID	0x7832
#define MCS7830_PRODUCT_ID	0x7830
#define MCS7730_PRODUCT_ID	0x7730

#define SITECOM_VENDOR_ID	0x0DF6
#define LN_030_PRODUCT_ID	0x0021

#define MCS7830_MII_ADVERTISE	(ADVERTISE_PAUSE_CAP | ADVERTISE_100FULL | \
				 ADVERTISE_100HALF | ADVERTISE_10FULL | \
				 ADVERTISE_10HALF | ADVERTISE_CSMA)

/* HIF_REG_XX corresponding index value */
enum {
	HIF_REG_MULTICAST_HASH			= 0x00,
	HIF_REG_PACKET_GAP1			= 0x08,
	HIF_REG_PACKET_GAP2			= 0x09,
	HIF_REG_PHY_DATA			= 0x0a,
	HIF_REG_PHY_CMD1			= 0x0c,
	   HIF_REG_PHY_CMD1_READ		= 0x40,
	   HIF_REG_PHY_CMD1_WRITE		= 0x20,
	   HIF_REG_PHY_CMD1_PHYADDR		= 0x01,
	HIF_REG_PHY_CMD2			= 0x0d,
	   HIF_REG_PHY_CMD2_PEND_FLAG_BIT	= 0x80,
	   HIF_REG_PHY_CMD2_READY_FLAG_BIT	= 0x40,
	HIF_REG_CONFIG				= 0x0e,
	/* hmm, spec sez: "R/W", "Except bit 3" (likely TXENABLE). */
	   HIF_REG_CONFIG_CFG			= 0x80,
	   HIF_REG_CONFIG_SPEED100		= 0x40,
	   HIF_REG_CONFIG_FULLDUPLEX_ENABLE	= 0x20,
	   HIF_REG_CONFIG_RXENABLE		= 0x10,
	   HIF_REG_CONFIG_TXENABLE		= 0x08,
	   HIF_REG_CONFIG_SLEEPMODE		= 0x04,
	   HIF_REG_CONFIG_ALLMULTICAST		= 0x02,
	   HIF_REG_CONFIG_PROMISCUOUS		= 0x01,
	HIF_REG_ETHERNET_ADDR			= 0x0f,
	HIF_REG_FRAME_DROP_COUNTER		= 0x15, /* 0..ff; reset: 0 */
	HIF_REG_PAUSE_THRESHOLD			= 0x16,
	   HIF_REG_PAUSE_THRESHOLD_DEFAULT	= 0,
};

/* Trailing status byte in Ethernet Rx frame */
enum {
	MCS7830_RX_SHORT_FRAME		= 0x01, /* < 64 bytes */
	MCS7830_RX_LENGTH_ERROR		= 0x02, /* framelen != Ethernet length field */
	MCS7830_RX_ALIGNMENT_ERROR	= 0x04, /* non-even number of nibbles */
	MCS7830_RX_CRC_ERROR		= 0x08,
	MCS7830_RX_LARGE_FRAME		= 0x10, /* > 1518 bytes */
	MCS7830_RX_FRAME_CORRECT	= 0x20, /* frame is correct */
	/* [7:6] reserved */
};

struct mcs7830_data {
	u8 multi_filter[8];
	u8 config;
};

static const char driver_name[] = "MOSCHIP usb-ethernet driver";

static int mcs7830_get_reg(struct usbnet *dev, u16 index, u16 size, void *data)
{
	return usbnet_read_cmd(dev, MCS7830_RD_BREQ, MCS7830_RD_BMREQ,
				0x0000, index, data, size);
}

static int mcs7830_set_reg(struct usbnet *dev, u16 index, u16 size, const void *data)
{
	return usbnet_write_cmd(dev, MCS7830_WR_BREQ, MCS7830_WR_BMREQ,
				0x0000, index, data, size);
}

static void mcs7830_set_reg_async(struct usbnet *dev, u16 index, u16 size, void *data)
{
	usbnet_write_cmd_async(dev, MCS7830_WR_BREQ, MCS7830_WR_BMREQ,
				0x0000, index, data, size);
}

static int mcs7830_hif_get_mac_address(struct usbnet *dev, unsigned char *addr)
{
	int ret = mcs7830_get_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN, addr);
	if (ret < 0)
		return ret;
	return 0;
}

static int mcs7830_hif_set_mac_address(struct usbnet *dev, unsigned char *addr)
{
	int ret = mcs7830_set_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN, addr);

	if (ret < 0)
		return ret;
	return 0;
}

static int mcs7830_set_mac_address(struct net_device *netdev, void *p)
{
	int ret;
	struct usbnet *dev = netdev_priv(netdev);
	struct sockaddr *addr = p;

	if (netif_running(netdev))
		return -EBUSY;

	if (!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;

	ret = mcs7830_hif_set_mac_address(dev, addr->sa_data);

	if (ret < 0)
		return ret;

	/* it worked --> adopt it on netdev side */
	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);

	return 0;
}

static int mcs7830_read_phy(struct usbnet *dev, u8 index)
{
	int ret;
	int i;
	__le16 val;

	u8 cmd[2] = {
		HIF_REG_PHY_CMD1_READ | HIF_REG_PHY_CMD1_PHYADDR,
		HIF_REG_PHY_CMD2_PEND_FLAG_BIT | index,
	};

	mutex_lock(&dev->phy_mutex);
	/* write the MII command */
	ret = mcs7830_set_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
	if (ret < 0)
		goto out;

	/* wait for the data to become valid, should be within < 1ms */
	for (i = 0; i < 10; i++) {
		ret = mcs7830_get_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
		if ((ret < 0) || (cmd[1] & HIF_REG_PHY_CMD2_READY_FLAG_BIT))
			break;
		ret = -EIO;
		msleep(1);
	}
	if (ret < 0)
		goto out;

	/* read actual register contents */
	ret = mcs7830_get_reg(dev, HIF_REG_PHY_DATA, 2, &val);
	if (ret < 0)
		goto out;
	ret = le16_to_cpu(val);
	dev_dbg(&dev->udev->dev, "read PHY reg %02x: %04x (%d tries)\n",
		index, val, i);
out:
	mutex_unlock(&dev->phy_mutex);
	return ret;
}

static int mcs7830_write_phy(struct usbnet *dev, u8 index, u16 val)
{
	int ret;
	int i;
	__le16 le_val;

	u8 cmd[2] = {
		HIF_REG_PHY_CMD1_WRITE | HIF_REG_PHY_CMD1_PHYADDR,
		HIF_REG_PHY_CMD2_PEND_FLAG_BIT | (index & 0x1F),
	};

	mutex_lock(&dev->phy_mutex);

	/* write the new register contents */
	le_val = cpu_to_le16(val);
	ret = mcs7830_set_reg(dev, HIF_REG_PHY_DATA, 2, &le_val);
	if (ret < 0)
		goto out;

	/* write the MII command */
	ret = mcs7830_set_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
	if (ret < 0)
		goto out;

	/* wait for the command to be accepted by the PHY */
	for (i = 0; i < 10; i++) {
		ret = mcs7830_get_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
		if ((ret < 0) || (cmd[1] & HIF_REG_PHY_CMD2_READY_FLAG_BIT))
			break;
		ret = -EIO;
		msleep(1);
	}
	if (ret < 0)
		goto out;

	ret = 0;
	dev_dbg(&dev->udev->dev, "write PHY reg %02x: %04x (%d tries)\n",
		index, val, i);
out:
	mutex_unlock(&dev->phy_mutex);
	return ret;
}

/*
 * This algorithm comes from the original mcs7830 version 1.4 driver,
 * not sure if it is needed.
 */
static int mcs7830_set_autoneg(struct usbnet *dev, int ptrUserPhyMode)
{
	int ret;
	/* Enable all media types */
	ret = mcs7830_write_phy(dev, MII_ADVERTISE, MCS7830_MII_ADVERTISE);

	/* First reset BMCR */
	if (!ret)
		ret = mcs7830_write_phy(dev, MII_BMCR, 0x0000);
	/* Enable Auto Neg */
	if (!ret)
		ret = mcs7830_write_phy(dev, MII_BMCR, BMCR_ANENABLE);
	/* Restart Auto Neg (Keep the Enable Auto Neg Bit Set) */
	if (!ret)
		ret = mcs7830_write_phy(dev, MII_BMCR,
				BMCR_ANENABLE | BMCR_ANRESTART	);
	return ret;
}


/*
 * if we can read register 22, the chip revision is C or higher
 */
static int mcs7830_get_rev(struct usbnet *dev)
{
	u8 dummy[2];
	int ret;
	ret = mcs7830_get_reg(dev, HIF_REG_FRAME_DROP_COUNTER, 2, dummy);
	if (ret > 0)
		return 2; /* Rev C or later */
	return 1; /* earlier revision */
}

/*
 * On rev. C we need to set the pause threshold
 */
static void mcs7830_rev_C_fixup(struct usbnet *dev)
{
	u8 pause_threshold = HIF_REG_PAUSE_THRESHOLD_DEFAULT;
	int retry;

	for (retry = 0; retry < 2; retry++) {
		if (mcs7830_get_rev(dev) == 2) {
			dev_info(&dev->udev->dev, "applying rev.C fixup\n");
			mcs7830_set_reg(dev, HIF_REG_PAUSE_THRESHOLD,
					1, &pause_threshold);
		}
		msleep(1);
	}
}

static int mcs7830_mdio_read(struct net_device *netdev, int phy_id,
			     int location)
{
	struct usbnet *dev = netdev_priv(netdev);
	return mcs7830_read_phy(dev, location);
}

static void mcs7830_mdio_write(struct net_device *netdev, int phy_id,
				int location, int val)
{
	struct usbnet *dev = netdev_priv(netdev);
	mcs7830_write_phy(dev, location, val);
}

static int mcs7830_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
{
	struct usbnet *dev = netdev_priv(net);
	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
}

static inline struct mcs7830_data *mcs7830_get_data(struct usbnet *dev)
{
	return (struct mcs7830_data *)&dev->data;
}

static void mcs7830_hif_update_multicast_hash(struct usbnet *dev)
{
	struct mcs7830_data *data = mcs7830_get_data(dev);
	mcs7830_set_reg_async(dev, HIF_REG_MULTICAST_HASH,
				sizeof data->multi_filter,
				data->multi_filter);
}

static void mcs7830_hif_update_config(struct usbnet *dev)
{
	/* implementation specific to data->config
           (argument needs to be heap-based anyway - USB DMA!) */
	struct mcs7830_data *data = mcs7830_get_data(dev);
	mcs7830_set_reg_async(dev, HIF_REG_CONFIG, 1, &data->config);
}

static void mcs7830_data_set_multicast(struct net_device *net)
{
	struct usbnet *dev = netdev_priv(net);
	struct mcs7830_data *data = mcs7830_get_data(dev);

	memset(data->multi_filter, 0, sizeof data->multi_filter);

	data->config = HIF_REG_CONFIG_TXENABLE;

	/* this should not be needed, but it doesn't work otherwise */
	data->config |= HIF_REG_CONFIG_ALLMULTICAST;

	if (net->flags & IFF_PROMISC) {
		data->config |= HIF_REG_CONFIG_PROMISCUOUS;
	} else if (net->flags & IFF_ALLMULTI ||
		   netdev_mc_count(net) > MCS7830_MAX_MCAST) {
		data->config |= HIF_REG_CONFIG_ALLMULTICAST;
	} else if (netdev_mc_empty(net)) {
		/* just broadcast and directed */
	} else {
		/* We use the 20 byte dev->data
		 * for our 8 byte filter buffer
		 * to avoid allocating memory that
		 * is tricky to free later */
		struct netdev_hw_addr *ha;
		u32 crc_bits;

		/* Build the multicast hash filter. */
		netdev_for_each_mc_addr(ha, net) {
			crc_bits = ether_crc(ETH_ALEN, ha->addr) >> 26;
			data->multi_filter[crc_bits >> 3] |= 1 << (crc_bits & 7);
		}
	}
}

static int mcs7830_apply_base_config(struct usbnet *dev)
{
	int ret;

	/* re-configure known MAC (suspend case etc.) */
	ret = mcs7830_hif_set_mac_address(dev, dev->net->dev_addr);
	if (ret) {
		dev_info(&dev->udev->dev, "Cannot set MAC address\n");
		goto out;
	}

	/* Set up PHY */
	ret = mcs7830_set_autoneg(dev, 0);
	if (ret) {
		dev_info(&dev->udev->dev, "Cannot set autoneg\n");
		goto out;
	}

	mcs7830_hif_update_multicast_hash(dev);
	mcs7830_hif_update_config(dev);

	mcs7830_rev_C_fixup(dev);
	ret = 0;
out:
	return ret;
}

/* credits go to asix_set_multicast */
static void mcs7830_set_multicast(struct net_device *net)
{
	struct usbnet *dev = netdev_priv(net);

	mcs7830_data_set_multicast(net);

	mcs7830_hif_update_multicast_hash(dev);
	mcs7830_hif_update_config(dev);
}

static int mcs7830_get_regs_len(struct net_device *net)
{
	struct usbnet *dev = netdev_priv(net);

	switch (mcs7830_get_rev(dev)) {
	case 1:
		return 21;
	case 2:
		return 32;
	}
	return 0;
}

static void mcs7830_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *drvinfo)
{
	usbnet_get_drvinfo(net, drvinfo);
	drvinfo->regdump_len = mcs7830_get_regs_len(net);
}

static void mcs7830_get_regs(struct net_device *net, struct ethtool_regs *regs, void *data)
{
	struct usbnet *dev = netdev_priv(net);

	regs->version = mcs7830_get_rev(dev);
	mcs7830_get_reg(dev, 0, regs->len, data);
}

static const struct ethtool_ops mcs7830_ethtool_ops = {
	.get_drvinfo		= mcs7830_get_drvinfo,
	.get_regs_len		= mcs7830_get_regs_len,
	.get_regs		= mcs7830_get_regs,

	/* common usbnet calls */
	.get_link		= usbnet_get_link,
	.get_msglevel		= usbnet_get_msglevel,
	.set_msglevel		= usbnet_set_msglevel,
	.get_settings		= usbnet_get_settings,
	.set_settings		= usbnet_set_settings,
	.nway_reset		= usbnet_nway_reset,
};

static const struct net_device_ops mcs7830_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_validate_addr	= eth_validate_addr,
	.ndo_do_ioctl 		= mcs7830_ioctl,
	.ndo_set_rx_mode	= mcs7830_set_multicast,
	.ndo_set_mac_address	= mcs7830_set_mac_address,
};

static int mcs7830_bind(struct usbnet *dev, struct usb_interface *udev)
{
	struct net_device *net = dev->net;
	int ret;
	int retry;

	/* Initial startup: Gather MAC address setting from EEPROM */
	ret = -EINVAL;
	for (retry = 0; retry < 5 && ret; retry++)
		ret = mcs7830_hif_get_mac_address(dev, net->dev_addr);
	if (ret) {
		dev_warn(&dev->udev->dev, "Cannot read MAC address\n");
		goto out;
	}

	mcs7830_data_set_multicast(net);

	ret = mcs7830_apply_base_config(dev);
	if (ret)
		goto out;

	net->ethtool_ops = &mcs7830_ethtool_ops;
	net->netdev_ops = &mcs7830_netdev_ops;

	/* reserve space for the status byte on rx */
	dev->rx_urb_size = ETH_FRAME_LEN + 1;

	dev->mii.mdio_read = mcs7830_mdio_read;
	dev->mii.mdio_write = mcs7830_mdio_write;
	dev->mii.dev = net;
	dev->mii.phy_id_mask = 0x3f;
	dev->mii.reg_num_mask = 0x1f;
	dev->mii.phy_id = *((u8 *) net->dev_addr + 1);

	ret = usbnet_get_endpoints(dev, udev);
out:
	return ret;
}

/* The chip always appends a status byte that we need to strip */
static int mcs7830_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
{
	u8 status;

	if (skb->len == 0) {
		dev_err(&dev->udev->dev, "unexpected empty rx frame\n");
		return 0;
	}

	skb_trim(skb, skb->len - 1);
	status = skb->data[skb->len];

	if (status != MCS7830_RX_FRAME_CORRECT) {
		dev_dbg(&dev->udev->dev, "rx fixup status %x\n", status);

		/* hmm, perhaps usbnet.c already sees a globally visible
		   frame error and increments rx_errors on its own already? */
		dev->net->stats.rx_errors++;

		if (status &	(MCS7830_RX_SHORT_FRAME
				|MCS7830_RX_LENGTH_ERROR
				|MCS7830_RX_LARGE_FRAME))
			dev->net->stats.rx_length_errors++;
		if (status & MCS7830_RX_ALIGNMENT_ERROR)
			dev->net->stats.rx_frame_errors++;
		if (status & MCS7830_RX_CRC_ERROR)
			dev->net->stats.rx_crc_errors++;
	}

	return skb->len > 0;
}

static void mcs7830_status(struct usbnet *dev, struct urb *urb)
{
	u8 *buf = urb->transfer_buffer;
	bool link, link_changed;

	if (urb->actual_length < 16)
		return;

	link = !(buf[1] == 0x20);
	link_changed = netif_carrier_ok(dev->net) != link;
	if (link_changed) {
		usbnet_link_change(dev, link, 0);
		netdev_dbg(dev->net, "Link Status is: %d\n", link);
	}
}

static const struct driver_info moschip_info = {
	.description	= "MOSCHIP 7830/7832/7730 usb-NET adapter",
	.bind		= mcs7830_bind,
	.rx_fixup	= mcs7830_rx_fixup,
	.flags		= FLAG_ETHER | FLAG_LINK_INTR,
	.status		= mcs7830_status,
	.in		= 1,
	.out		= 2,
};

static const struct driver_info sitecom_info = {
	.description    = "Sitecom LN-30 usb-NET adapter",
	.bind		= mcs7830_bind,
	.rx_fixup	= mcs7830_rx_fixup,
	.flags		= FLAG_ETHER | FLAG_LINK_INTR,
	.status		= mcs7830_status,
	.in		= 1,
	.out		= 2,
};

static const struct usb_device_id products[] = {
	{
		USB_DEVICE(MCS7830_VENDOR_ID, MCS7832_PRODUCT_ID),
		.driver_info = (unsigned long) &moschip_info,
	},
	{
		USB_DEVICE(MCS7830_VENDOR_ID, MCS7830_PRODUCT_ID),
		.driver_info = (unsigned long) &moschip_info,
	},
	{
		USB_DEVICE(MCS7830_VENDOR_ID, MCS7730_PRODUCT_ID),
		.driver_info = (unsigned long) &moschip_info,
	},
	{
		USB_DEVICE(SITECOM_VENDOR_ID, LN_030_PRODUCT_ID),
		.driver_info = (unsigned long) &sitecom_info,
	},
	{},
};
MODULE_DEVICE_TABLE(usb, products);

static int mcs7830_reset_resume (struct usb_interface *intf)
{
 	/* YES, this function is successful enough that ethtool -d
           does show same output pre-/post-suspend */

	struct usbnet		*dev = usb_get_intfdata(intf);

	mcs7830_apply_base_config(dev);

	usbnet_resume(intf);

	return 0;
}

static struct usb_driver mcs7830_driver = {
	.name = driver_name,
	.id_table = products,
	.probe = usbnet_probe,
	.disconnect = usbnet_disconnect,
	.suspend = usbnet_suspend,
	.resume = usbnet_resume,
	.reset_resume = mcs7830_reset_resume,
	.disable_hub_initiated_lpm = 1,
};

module_usb_driver(mcs7830_driver);

MODULE_DESCRIPTION("USB to network adapter MCS7830)");
MODULE_LICENSE("GPL");
Commit	Line	Data
2a36d708	1	/*
bbccc16c	2	* MOSCHIP MCS7830 based (7730/7830/7832) USB 2.0 Ethernet Devices
2a36d708 AB	3	*
	4	* based on usbnet.c, asix.c and the vendor provided mcs7830 driver
	5	*
76802851	6	* Copyright (C) 2010 Andreas Mohr <andi@lisas.de>
2a36d708 AB	7	* Copyright (C) 2006 Arnd Bergmann <arnd@arndb.de>
	8	* Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
	9	* Copyright (C) 2005 Phil Chang <pchang23@sbcglobal.net>
	10	* Copyright (c) 2002-2003 TiVo Inc.
	11	*
76802851 AM	12	* Definitions gathered from MOSCHIP, Data Sheet_7830DA.pdf (thanks!).
76802851 AM	13	*
bbccc16c AM	14	* 2010-12-19: add 7832 USB PID ("functionality same as MCS7830"),
	15	* per active notification by manufacturer
	16	*
76802851	17	* TODO:
76802851 AM	18	* - support HIF_REG_CONFIG_SLEEPMODE/HIF_REG_CONFIG_TXENABLE (via autopm?)
	19	* - implement ethtool_ops get_pauseparam/set_pauseparam
	20	* via HIF_REG_PAUSE_THRESHOLD (>= revision C only!)
	21	* - implement get_eeprom/[set_eeprom]
	22	* - switch PHY on/off on ifup/ifdown (perhaps in usbnet.c, via MII)
	23	* - mcs7830_get_regs() handling is weird: for rev 2 we return 32 regs,
	24	* can access only ~ 24, remaining user buffer is uninitialized garbage
	25	* - anything else?
	26	*
	27	*
2a36d708 AB	28	* This program is free software; you can redistribute it and/or modify
	29	* it under the terms of the GNU General Public License as published by
	30	* the Free Software Foundation; either version 2 of the License, or
	31	* (at your option) any later version.
	32	*
	33	* This program is distributed in the hope that it will be useful,
	34	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	35	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	36	* GNU General Public License for more details.
	37	*
	38	* You should have received a copy of the GNU General Public License
	39	* along with this program; if not, write to the Free Software
	40	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	41	*/
	42
	43	#include <linux/crc32.h>
	44	#include <linux/etherdevice.h>
	45	#include <linux/ethtool.h>
	46	#include <linux/init.h>
	47	#include <linux/mii.h>
	48	#include <linux/module.h>
	49	#include <linux/netdevice.h>
5a0e3ad6	50	#include <linux/slab.h>
2a36d708	51	#include <linux/usb.h>
3692e94f	52	#include <linux/usb/usbnet.h>
2a36d708 AB	53
	54	/* requests */
	55	#define MCS7830_RD_BMREQ (USB_DIR_IN \| USB_TYPE_VENDOR \| \
	56	USB_RECIP_DEVICE)
	57	#define MCS7830_WR_BMREQ (USB_DIR_OUT \| USB_TYPE_VENDOR \| \
	58	USB_RECIP_DEVICE)
	59	#define MCS7830_RD_BREQ 0x0E
	60	#define MCS7830_WR_BREQ 0x0D
	61
	62	#define MCS7830_CTRL_TIMEOUT 1000
	63	#define MCS7830_MAX_MCAST 64
	64
	65	#define MCS7830_VENDOR_ID 0x9710
bbccc16c	66	#define MCS7832_PRODUCT_ID 0x7832
2a36d708	67	#define MCS7830_PRODUCT_ID 0x7830
8382cc1c AB	68	#define MCS7730_PRODUCT_ID 0x7730
	69
	70	#define SITECOM_VENDOR_ID 0x0DF6
	71	#define LN_030_PRODUCT_ID 0x0021
2a36d708 AB	72
	73	#define MCS7830_MII_ADVERTISE (ADVERTISE_PAUSE_CAP \| ADVERTISE_100FULL \| \
	74	ADVERTISE_100HALF \| ADVERTISE_10FULL \| \
	75	ADVERTISE_10HALF \| ADVERTISE_CSMA)
	76
00e49913	77	/* HIF_REG_XX corresponding index value */
2a36d708 AB	78	enum {
	79	HIF_REG_MULTICAST_HASH = 0x00,
	80	HIF_REG_PACKET_GAP1 = 0x08,
	81	HIF_REG_PACKET_GAP2 = 0x09,
	82	HIF_REG_PHY_DATA = 0x0a,
	83	HIF_REG_PHY_CMD1 = 0x0c,
	84	HIF_REG_PHY_CMD1_READ = 0x40,
	85	HIF_REG_PHY_CMD1_WRITE = 0x20,
	86	HIF_REG_PHY_CMD1_PHYADDR = 0x01,
	87	HIF_REG_PHY_CMD2 = 0x0d,
	88	HIF_REG_PHY_CMD2_PEND_FLAG_BIT = 0x80,
	89	HIF_REG_PHY_CMD2_READY_FLAG_BIT = 0x40,
	90	HIF_REG_CONFIG = 0x0e,
c774651a	91	/* hmm, spec sez: "R/W", "Except bit 3" (likely TXENABLE). */
2a36d708 AB	92	HIF_REG_CONFIG_CFG = 0x80,
	93	HIF_REG_CONFIG_SPEED100 = 0x40,
	94	HIF_REG_CONFIG_FULLDUPLEX_ENABLE = 0x20,
	95	HIF_REG_CONFIG_RXENABLE = 0x10,
	96	HIF_REG_CONFIG_TXENABLE = 0x08,
	97	HIF_REG_CONFIG_SLEEPMODE = 0x04,
	98	HIF_REG_CONFIG_ALLMULTICAST = 0x02,
00e49913	99	HIF_REG_CONFIG_PROMISCUOUS = 0x01,
2a36d708	100	HIF_REG_ETHERNET_ADDR = 0x0f,
c774651a	101	HIF_REG_FRAME_DROP_COUNTER = 0x15, /* 0..ff; reset: 0 */
2a36d708 AB	102	HIF_REG_PAUSE_THRESHOLD = 0x16,
	103	HIF_REG_PAUSE_THRESHOLD_DEFAULT = 0,
	104	};
	105
76802851 AM	106	/* Trailing status byte in Ethernet Rx frame */
	107	enum {
	108	MCS7830_RX_SHORT_FRAME = 0x01, /* < 64 bytes */
	109	MCS7830_RX_LENGTH_ERROR = 0x02, /* framelen != Ethernet length field */
	110	MCS7830_RX_ALIGNMENT_ERROR = 0x04, /* non-even number of nibbles */
	111	MCS7830_RX_CRC_ERROR = 0x08,
	112	MCS7830_RX_LARGE_FRAME = 0x10, /* > 1518 bytes */
	113	MCS7830_RX_FRAME_CORRECT = 0x20, /* frame is correct */
	114	/* [7:6] reserved */
	115	};
	116
2a36d708 AB	117	struct mcs7830_data {
	118	u8 multi_filter[8];
	119	u8 config;
	120	};
	121
	122	static const char driver_name[] = "MOSCHIP usb-ethernet driver";
	123
	124	static int mcs7830_get_reg(struct usbnet dev, u16 index, u16 size, void data)
	125	{
9c06a2b5 ML	126	return usbnet_read_cmd(dev, MCS7830_RD_BREQ, MCS7830_RD_BMREQ,
9c06a2b5 ML	127	0x0000, index, data, size);
2a36d708 AB	128	}
2a36d708 AB	129
ace2a4d0	130	static int mcs7830_set_reg(struct usbnet dev, u16 index, u16 size, const void data)
2a36d708	131	{
9c06a2b5 ML	132	return usbnet_write_cmd(dev, MCS7830_WR_BREQ, MCS7830_WR_BMREQ,
9c06a2b5 ML	133	0x0000, index, data, size);
2a36d708 AB	134	}
	135
	136	static void mcs7830_set_reg_async(struct usbnet dev, u16 index, u16 size, void data)
	137	{
9c06a2b5 ML	138	usbnet_write_cmd_async(dev, MCS7830_WR_BREQ, MCS7830_WR_BMREQ,
9c06a2b5 ML	139	0x0000, index, data, size);
2a36d708 AB	140	}
2a36d708 AB	141
ace2a4d0 AM	142	static int mcs7830_hif_get_mac_address(struct usbnet dev, unsigned char addr)
	143	{
	144	int ret = mcs7830_get_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN, addr);
	145	if (ret < 0)
	146	return ret;
	147	return 0;
	148	}
	149
	150	static int mcs7830_hif_set_mac_address(struct usbnet dev, unsigned char addr)
	151	{
	152	int ret = mcs7830_set_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN, addr);
	153
	154	if (ret < 0)
	155	return ret;
	156	return 0;
	157	}
	158
	159	static int mcs7830_set_mac_address(struct net_device netdev, void p)
2a36d708 AB	160	{
2a36d708 AB	161	int ret;
ace2a4d0 AM	162	struct usbnet *dev = netdev_priv(netdev);
	163	struct sockaddr *addr = p;
	164
	165	if (netif_running(netdev))
	166	return -EBUSY;
	167
	168	if (!is_valid_ether_addr(addr->sa_data))
15b8f4cf	169	return -EADDRNOTAVAIL;
ace2a4d0 AM	170
	171	ret = mcs7830_hif_set_mac_address(dev, addr->sa_data);
	172
2a36d708 AB	173	if (ret < 0)
2a36d708 AB	174	return ret;
ace2a4d0 AM	175
	176	/* it worked --> adopt it on netdev side */
	177	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
	178
2a36d708 AB	179	return 0;
	180	}
	181
	182	static int mcs7830_read_phy(struct usbnet *dev, u8 index)
	183	{
	184	int ret;
	185	int i;
	186	__le16 val;
	187
	188	u8 cmd[2] = {
	189	HIF_REG_PHY_CMD1_READ \| HIF_REG_PHY_CMD1_PHYADDR,
	190	HIF_REG_PHY_CMD2_PEND_FLAG_BIT \| index,
	191	};
	192
a9fc6338	193	mutex_lock(&dev->phy_mutex);
2a36d708 AB	194	/* write the MII command */
	195	ret = mcs7830_set_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
	196	if (ret < 0)
	197	goto out;
	198
	199	/* wait for the data to become valid, should be within < 1ms */
	200	for (i = 0; i < 10; i++) {
	201	ret = mcs7830_get_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
	202	if ((ret < 0) \|\| (cmd[1] & HIF_REG_PHY_CMD2_READY_FLAG_BIT))
	203	break;
	204	ret = -EIO;
	205	msleep(1);
	206	}
	207	if (ret < 0)
	208	goto out;
	209
	210	/* read actual register contents */
	211	ret = mcs7830_get_reg(dev, HIF_REG_PHY_DATA, 2, &val);
	212	if (ret < 0)
	213	goto out;
	214	ret = le16_to_cpu(val);
	215	dev_dbg(&dev->udev->dev, "read PHY reg %02x: %04x (%d tries)\n",
	216	index, val, i);
	217	out:
a9fc6338	218	mutex_unlock(&dev->phy_mutex);
2a36d708 AB	219	return ret;
	220	}
	221
	222	static int mcs7830_write_phy(struct usbnet *dev, u8 index, u16 val)
	223	{
	224	int ret;
	225	int i;
	226	__le16 le_val;
	227
	228	u8 cmd[2] = {
	229	HIF_REG_PHY_CMD1_WRITE \| HIF_REG_PHY_CMD1_PHYADDR,
	230	HIF_REG_PHY_CMD2_PEND_FLAG_BIT \| (index & 0x1F),
	231	};
	232
a9fc6338 AB	233	mutex_lock(&dev->phy_mutex);
a9fc6338 AB	234
2a36d708 AB	235	/* write the new register contents */
	236	le_val = cpu_to_le16(val);
	237	ret = mcs7830_set_reg(dev, HIF_REG_PHY_DATA, 2, &le_val);
	238	if (ret < 0)
	239	goto out;
	240
	241	/* write the MII command */
	242	ret = mcs7830_set_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
	243	if (ret < 0)
	244	goto out;
	245
	246	/* wait for the command to be accepted by the PHY */
	247	for (i = 0; i < 10; i++) {
	248	ret = mcs7830_get_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
	249	if ((ret < 0) \|\| (cmd[1] & HIF_REG_PHY_CMD2_READY_FLAG_BIT))
	250	break;
	251	ret = -EIO;
	252	msleep(1);
	253	}
	254	if (ret < 0)
	255	goto out;
	256
	257	ret = 0;
	258	dev_dbg(&dev->udev->dev, "write PHY reg %02x: %04x (%d tries)\n",
	259	index, val, i);
	260	out:
a9fc6338	261	mutex_unlock(&dev->phy_mutex);
2a36d708 AB	262	return ret;
	263	}
	264
	265	/*
	266	* This algorithm comes from the original mcs7830 version 1.4 driver,
	267	* not sure if it is needed.
	268	*/
	269	static int mcs7830_set_autoneg(struct usbnet *dev, int ptrUserPhyMode)
	270	{
	271	int ret;
	272	/* Enable all media types */
	273	ret = mcs7830_write_phy(dev, MII_ADVERTISE, MCS7830_MII_ADVERTISE);
	274
	275	/* First reset BMCR */
	276	if (!ret)
	277	ret = mcs7830_write_phy(dev, MII_BMCR, 0x0000);
	278	/* Enable Auto Neg */
	279	if (!ret)
	280	ret = mcs7830_write_phy(dev, MII_BMCR, BMCR_ANENABLE);
	281	/* Restart Auto Neg (Keep the Enable Auto Neg Bit Set) */
	282	if (!ret)
	283	ret = mcs7830_write_phy(dev, MII_BMCR,
	284	BMCR_ANENABLE \| BMCR_ANRESTART );
0e214ad8	285	return ret;
2a36d708 AB	286	}
	287
	288
	289	/*
	290	* if we can read register 22, the chip revision is C or higher
	291	*/
	292	static int mcs7830_get_rev(struct usbnet *dev)
	293	{
	294	u8 dummy[2];
	295	int ret;
c774651a	296	ret = mcs7830_get_reg(dev, HIF_REG_FRAME_DROP_COUNTER, 2, dummy);
2a36d708 AB	297	if (ret > 0)
	298	return 2; /* Rev C or later */
	299	return 1; /* earlier revision */
	300	}
	301
	302	/*
	303	* On rev. C we need to set the pause threshold
	304	*/
	305	static void mcs7830_rev_C_fixup(struct usbnet *dev)
	306	{
	307	u8 pause_threshold = HIF_REG_PAUSE_THRESHOLD_DEFAULT;
	308	int retry;
	309
	310	for (retry = 0; retry < 2; retry++) {
	311	if (mcs7830_get_rev(dev) == 2) {
	312	dev_info(&dev->udev->dev, "applying rev.C fixup\n");
	313	mcs7830_set_reg(dev, HIF_REG_PAUSE_THRESHOLD,
	314	1, &pause_threshold);
	315	}
	316	msleep(1);
	317	}
	318	}
	319
2a36d708 AB	320	static int mcs7830_mdio_read(struct net_device *netdev, int phy_id,
	321	int location)
	322	{
8f15ea42	323	struct usbnet *dev = netdev_priv(netdev);
2a36d708 AB	324	return mcs7830_read_phy(dev, location);
	325	}
	326
	327	static void mcs7830_mdio_write(struct net_device *netdev, int phy_id,
	328	int location, int val)
	329	{
8f15ea42	330	struct usbnet *dev = netdev_priv(netdev);
2a36d708 AB	331	mcs7830_write_phy(dev, location, val);
	332	}
	333
	334	static int mcs7830_ioctl(struct net_device net, struct ifreq rq, int cmd)
	335	{
	336	struct usbnet *dev = netdev_priv(net);
	337	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
	338	}
	339
ace2a4d0 AM	340	static inline struct mcs7830_data mcs7830_get_data(struct usbnet dev)
	341	{
	342	return (struct mcs7830_data *)&dev->data;
	343	}
	344
	345	static void mcs7830_hif_update_multicast_hash(struct usbnet *dev)
	346	{
	347	struct mcs7830_data *data = mcs7830_get_data(dev);
	348	mcs7830_set_reg_async(dev, HIF_REG_MULTICAST_HASH,
	349	sizeof data->multi_filter,
	350	data->multi_filter);
	351	}
	352
	353	static void mcs7830_hif_update_config(struct usbnet *dev)
	354	{
	355	/* implementation specific to data->config
	356	(argument needs to be heap-based anyway - USB DMA!) */
	357	struct mcs7830_data *data = mcs7830_get_data(dev);
	358	mcs7830_set_reg_async(dev, HIF_REG_CONFIG, 1, &data->config);
	359	}
	360
	361	static void mcs7830_data_set_multicast(struct net_device *net)
2a36d708 AB	362	{
2a36d708 AB	363	struct usbnet *dev = netdev_priv(net);
ace2a4d0 AM	364	struct mcs7830_data *data = mcs7830_get_data(dev);
	365
	366	memset(data->multi_filter, 0, sizeof data->multi_filter);
2a36d708 AB	367
	368	data->config = HIF_REG_CONFIG_TXENABLE;
	369
	370	/* this should not be needed, but it doesn't work otherwise */
	371	data->config \|= HIF_REG_CONFIG_ALLMULTICAST;
	372
	373	if (net->flags & IFF_PROMISC) {
00e49913	374	data->config \|= HIF_REG_CONFIG_PROMISCUOUS;
8e95a202	375	} else if (net->flags & IFF_ALLMULTI \|\|
4cd24eaf	376	netdev_mc_count(net) > MCS7830_MAX_MCAST) {
2a36d708	377	data->config \|= HIF_REG_CONFIG_ALLMULTICAST;
4cd24eaf	378	} else if (netdev_mc_empty(net)) {
2a36d708 AB	379	/* just broadcast and directed */
	380	} else {
	381	/* We use the 20 byte dev->data
	382	* for our 8 byte filter buffer
	383	* to avoid allocating memory that
	384	* is tricky to free later */
22bedad3	385	struct netdev_hw_addr *ha;
2a36d708	386	u32 crc_bits;
2a36d708	387
2a36d708	388	/* Build the multicast hash filter. */
22bedad3 JP	389	netdev_for_each_mc_addr(ha, net) {
22bedad3 JP	390	crc_bits = ether_crc(ETH_ALEN, ha->addr) >> 26;
2a36d708	391	data->multi_filter[crc_bits >> 3] \|= 1 << (crc_bits & 7);
2a36d708	392	}
ace2a4d0 AM	393	}
ace2a4d0 AM	394	}
2a36d708	395
ace2a4d0 AM	396	static int mcs7830_apply_base_config(struct usbnet *dev)
	397	{
	398	int ret;
	399
	400	/* re-configure known MAC (suspend case etc.) */
	401	ret = mcs7830_hif_set_mac_address(dev, dev->net->dev_addr);
	402	if (ret) {
	403	dev_info(&dev->udev->dev, "Cannot set MAC address\n");
	404	goto out;
2a36d708 AB	405	}
2a36d708 AB	406
ace2a4d0 AM	407	/* Set up PHY */
	408	ret = mcs7830_set_autoneg(dev, 0);
	409	if (ret) {
	410	dev_info(&dev->udev->dev, "Cannot set autoneg\n");
	411	goto out;
	412	}
	413
	414	mcs7830_hif_update_multicast_hash(dev);
	415	mcs7830_hif_update_config(dev);
	416
	417	mcs7830_rev_C_fixup(dev);
	418	ret = 0;
	419	out:
	420	return ret;
	421	}
	422
	423	/* credits go to asix_set_multicast */
	424	static void mcs7830_set_multicast(struct net_device *net)
	425	{
	426	struct usbnet *dev = netdev_priv(net);
	427
	428	mcs7830_data_set_multicast(net);
	429
	430	mcs7830_hif_update_multicast_hash(dev);
	431	mcs7830_hif_update_config(dev);
2a36d708 AB	432	}
	433
	434	static int mcs7830_get_regs_len(struct net_device *net)
	435	{
	436	struct usbnet *dev = netdev_priv(net);
	437
	438	switch (mcs7830_get_rev(dev)) {
	439	case 1:
	440	return 21;
	441	case 2:
	442	return 32;
	443	}
	444	return 0;
	445	}
	446
	447	static void mcs7830_get_drvinfo(struct net_device net, struct ethtool_drvinfo drvinfo)
	448	{
	449	usbnet_get_drvinfo(net, drvinfo);
	450	drvinfo->regdump_len = mcs7830_get_regs_len(net);
	451	}
	452
	453	static void mcs7830_get_regs(struct net_device net, struct ethtool_regs regs, void *data)
	454	{
	455	struct usbnet *dev = netdev_priv(net);
	456
	457	regs->version = mcs7830_get_rev(dev);
	458	mcs7830_get_reg(dev, 0, regs->len, data);
	459	}
	460
0fc0b732	461	static const struct ethtool_ops mcs7830_ethtool_ops = {
2a36d708 AB	462	.get_drvinfo = mcs7830_get_drvinfo,
	463	.get_regs_len = mcs7830_get_regs_len,
	464	.get_regs = mcs7830_get_regs,
	465
	466	/* common usbnet calls */
c41286fd	467	.get_link = usbnet_get_link,
2a36d708 AB	468	.get_msglevel = usbnet_get_msglevel,
2a36d708 AB	469	.set_msglevel = usbnet_set_msglevel,
c41286fd AB	470	.get_settings = usbnet_get_settings,
	471	.set_settings = usbnet_set_settings,
	472	.nway_reset = usbnet_nway_reset,
2a36d708 AB	473	};
2a36d708 AB	474
e12c4f83 SH	475	static const struct net_device_ops mcs7830_netdev_ops = {
	476	.ndo_open = usbnet_open,
	477	.ndo_stop = usbnet_stop,
	478	.ndo_start_xmit = usbnet_start_xmit,
	479	.ndo_tx_timeout = usbnet_tx_timeout,
	480	.ndo_change_mtu = usbnet_change_mtu,
	481	.ndo_validate_addr = eth_validate_addr,
	482	.ndo_do_ioctl = mcs7830_ioctl,
afc4b13d	483	.ndo_set_rx_mode = mcs7830_set_multicast,
00e49913	484	.ndo_set_mac_address = mcs7830_set_mac_address,
e12c4f83 SH	485	};
e12c4f83 SH	486
2a36d708 AB	487	static int mcs7830_bind(struct usbnet dev, struct usb_interface udev)
	488	{
	489	struct net_device *net = dev->net;
	490	int ret;
ace2a4d0	491	int retry;
2a36d708	492
ace2a4d0 AM	493	/* Initial startup: Gather MAC address setting from EEPROM */
	494	ret = -EINVAL;
	495	for (retry = 0; retry < 5 && ret; retry++)
	496	ret = mcs7830_hif_get_mac_address(dev, net->dev_addr);
	497	if (ret) {
	498	dev_warn(&dev->udev->dev, "Cannot read MAC address\n");
	499	goto out;
	500	}
	501
	502	mcs7830_data_set_multicast(net);
	503
	504	ret = mcs7830_apply_base_config(dev);
2a36d708 AB	505	if (ret)
	506	goto out;
	507
2a36d708	508	net->ethtool_ops = &mcs7830_ethtool_ops;
e12c4f83	509	net->netdev_ops = &mcs7830_netdev_ops;
2a36d708 AB	510
	511	/* reserve space for the status byte on rx */
	512	dev->rx_urb_size = ETH_FRAME_LEN + 1;
	513
	514	dev->mii.mdio_read = mcs7830_mdio_read;
	515	dev->mii.mdio_write = mcs7830_mdio_write;
	516	dev->mii.dev = net;
	517	dev->mii.phy_id_mask = 0x3f;
	518	dev->mii.reg_num_mask = 0x1f;
	519	dev->mii.phy_id = ((u8 ) net->dev_addr + 1);
	520
	521	ret = usbnet_get_endpoints(dev, udev);
	522	out:
	523	return ret;
	524	}
	525
00e49913	526	/* The chip always appends a status byte that we need to strip */
2a36d708 AB	527	static int mcs7830_rx_fixup(struct usbnet dev, struct sk_buff skb)
	528	{
	529	u8 status;
	530
	531	if (skb->len == 0) {
	532	dev_err(&dev->udev->dev, "unexpected empty rx frame\n");
	533	return 0;
	534	}
	535
	536	skb_trim(skb, skb->len - 1);
	537	status = skb->data[skb->len];
	538
76802851	539	if (status != MCS7830_RX_FRAME_CORRECT) {
2a36d708 AB	540	dev_dbg(&dev->udev->dev, "rx fixup status %x\n", status);
2a36d708 AB	541
76802851 AM	542	/* hmm, perhaps usbnet.c already sees a globally visible
	543	frame error and increments rx_errors on its own already? */
	544	dev->net->stats.rx_errors++;
	545
	546	if (status & (MCS7830_RX_SHORT_FRAME
	547	\|MCS7830_RX_LENGTH_ERROR
	548	\|MCS7830_RX_LARGE_FRAME))
	549	dev->net->stats.rx_length_errors++;
	550	if (status & MCS7830_RX_ALIGNMENT_ERROR)
	551	dev->net->stats.rx_frame_errors++;
	552	if (status & MCS7830_RX_CRC_ERROR)
	553	dev->net->stats.rx_crc_errors++;
	554	}
	555
2a36d708 AB	556	return skb->len > 0;
	557	}
	558
b1ff4f96 OZ	559	static void mcs7830_status(struct usbnet dev, struct urb urb)
	560	{
	561	u8 *buf = urb->transfer_buffer;
dabdaf0c	562	bool link, link_changed;
b1ff4f96 OZ	563
	564	if (urb->actual_length < 16)
	565	return;
	566
8d88bbff	567	link = !(buf[1] == 0x20);
dabdaf0c OZ	568	link_changed = netif_carrier_ok(dev->net) != link;
dabdaf0c OZ	569	if (link_changed) {
8d88bbff OP	570	usbnet_link_change(dev, link, 0);
	571	netdev_dbg(dev->net, "Link Status is: %d\n", link);
	572	}
b1ff4f96 OZ	573	}
b1ff4f96 OZ	574
2a36d708	575	static const struct driver_info moschip_info = {
bbccc16c	576	.description = "MOSCHIP 7830/7832/7730 usb-NET adapter",
8382cc1c AB	577	.bind = mcs7830_bind,
8382cc1c AB	578	.rx_fixup = mcs7830_rx_fixup,
b1ff4f96 OZ	579	.flags = FLAG_ETHER \| FLAG_LINK_INTR,
b1ff4f96 OZ	580	.status = mcs7830_status,
8382cc1c AB	581	.in = 1,
	582	.out = 2,
	583	};
	584
	585	static const struct driver_info sitecom_info = {
	586	.description = "Sitecom LN-30 usb-NET adapter",
2a36d708 AB	587	.bind = mcs7830_bind,
2a36d708 AB	588	.rx_fixup = mcs7830_rx_fixup,
b1ff4f96 OZ	589	.flags = FLAG_ETHER \| FLAG_LINK_INTR,
b1ff4f96 OZ	590	.status = mcs7830_status,
2a36d708 AB	591	.in = 1,
	592	.out = 2,
	593	};
	594
	595	static const struct usb_device_id products[] = {
bbccc16c AM	596	{
	597	USB_DEVICE(MCS7830_VENDOR_ID, MCS7832_PRODUCT_ID),
	598	.driver_info = (unsigned long) &moschip_info,
	599	},
2a36d708 AB	600	{
	601	USB_DEVICE(MCS7830_VENDOR_ID, MCS7830_PRODUCT_ID),
	602	.driver_info = (unsigned long) &moschip_info,
	603	},
8382cc1c AB	604	{
	605	USB_DEVICE(MCS7830_VENDOR_ID, MCS7730_PRODUCT_ID),
	606	.driver_info = (unsigned long) &moschip_info,
	607	},
	608	{
	609	USB_DEVICE(SITECOM_VENDOR_ID, LN_030_PRODUCT_ID),
	610	.driver_info = (unsigned long) &sitecom_info,
	611	},
2a36d708 AB	612	{},
	613	};
	614	MODULE_DEVICE_TABLE(usb, products);
	615
ace2a4d0 AM	616	static int mcs7830_reset_resume (struct usb_interface *intf)
	617	{
	618	/* YES, this function is successful enough that ethtool -d
	619	does show same output pre-/post-suspend */
	620
	621	struct usbnet *dev = usb_get_intfdata(intf);
	622
	623	mcs7830_apply_base_config(dev);
	624
	625	usbnet_resume(intf);
	626
	627	return 0;
	628	}
	629
2a36d708 AB	630	static struct usb_driver mcs7830_driver = {
	631	.name = driver_name,
	632	.id_table = products,
	633	.probe = usbnet_probe,
	634	.disconnect = usbnet_disconnect,
	635	.suspend = usbnet_suspend,
	636	.resume = usbnet_resume,
ace2a4d0	637	.reset_resume = mcs7830_reset_resume,
e1f12eb6	638	.disable_hub_initiated_lpm = 1,
2a36d708 AB	639	};
2a36d708 AB	640
d632eb1b	641	module_usb_driver(mcs7830_driver);
2a36d708 AB	642
	643	MODULE_DESCRIPTION("USB to network adapter MCS7830)");
	644	MODULE_LICENSE("GPL");