[deliverable/linux.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, see <http://www.gnu.org/licenses/>.
 */

#include <linux/crc32.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.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);
}

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;

	/* This check is no longer done by usbnet */
	if (skb->len < dev->net->hard_header_len) {
		dev_err(&dev->udev->dev, "unexpected tiny 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
9cb00073	39	* along with this program; if not, see <http://www.gnu.org/licenses/>.
2a36d708 AB	40	*/
	41
	42	#include <linux/crc32.h>
	43	#include <linux/etherdevice.h>
	44	#include <linux/ethtool.h>
2a36d708 AB	45	#include <linux/mii.h>
	46	#include <linux/module.h>
	47	#include <linux/netdevice.h>
5a0e3ad6	48	#include <linux/slab.h>
2a36d708	49	#include <linux/usb.h>
3692e94f	50	#include <linux/usb/usbnet.h>
2a36d708 AB	51
	52	/* requests */
	53	#define MCS7830_RD_BMREQ (USB_DIR_IN \| USB_TYPE_VENDOR \| \
	54	USB_RECIP_DEVICE)
	55	#define MCS7830_WR_BMREQ (USB_DIR_OUT \| USB_TYPE_VENDOR \| \
	56	USB_RECIP_DEVICE)
	57	#define MCS7830_RD_BREQ 0x0E
	58	#define MCS7830_WR_BREQ 0x0D
	59
	60	#define MCS7830_CTRL_TIMEOUT 1000
	61	#define MCS7830_MAX_MCAST 64
	62
	63	#define MCS7830_VENDOR_ID 0x9710
bbccc16c	64	#define MCS7832_PRODUCT_ID 0x7832
2a36d708	65	#define MCS7830_PRODUCT_ID 0x7830
8382cc1c AB	66	#define MCS7730_PRODUCT_ID 0x7730
	67
	68	#define SITECOM_VENDOR_ID 0x0DF6
	69	#define LN_030_PRODUCT_ID 0x0021
2a36d708 AB	70
	71	#define MCS7830_MII_ADVERTISE (ADVERTISE_PAUSE_CAP \| ADVERTISE_100FULL \| \
	72	ADVERTISE_100HALF \| ADVERTISE_10FULL \| \
	73	ADVERTISE_10HALF \| ADVERTISE_CSMA)
	74
00e49913	75	/* HIF_REG_XX corresponding index value */
2a36d708 AB	76	enum {
	77	HIF_REG_MULTICAST_HASH = 0x00,
	78	HIF_REG_PACKET_GAP1 = 0x08,
	79	HIF_REG_PACKET_GAP2 = 0x09,
	80	HIF_REG_PHY_DATA = 0x0a,
	81	HIF_REG_PHY_CMD1 = 0x0c,
	82	HIF_REG_PHY_CMD1_READ = 0x40,
	83	HIF_REG_PHY_CMD1_WRITE = 0x20,
	84	HIF_REG_PHY_CMD1_PHYADDR = 0x01,
	85	HIF_REG_PHY_CMD2 = 0x0d,
	86	HIF_REG_PHY_CMD2_PEND_FLAG_BIT = 0x80,
	87	HIF_REG_PHY_CMD2_READY_FLAG_BIT = 0x40,
	88	HIF_REG_CONFIG = 0x0e,
c774651a	89	/* hmm, spec sez: "R/W", "Except bit 3" (likely TXENABLE). */
2a36d708 AB	90	HIF_REG_CONFIG_CFG = 0x80,
	91	HIF_REG_CONFIG_SPEED100 = 0x40,
	92	HIF_REG_CONFIG_FULLDUPLEX_ENABLE = 0x20,
	93	HIF_REG_CONFIG_RXENABLE = 0x10,
	94	HIF_REG_CONFIG_TXENABLE = 0x08,
	95	HIF_REG_CONFIG_SLEEPMODE = 0x04,
	96	HIF_REG_CONFIG_ALLMULTICAST = 0x02,
00e49913	97	HIF_REG_CONFIG_PROMISCUOUS = 0x01,
2a36d708	98	HIF_REG_ETHERNET_ADDR = 0x0f,
c774651a	99	HIF_REG_FRAME_DROP_COUNTER = 0x15, /* 0..ff; reset: 0 */
2a36d708 AB	100	HIF_REG_PAUSE_THRESHOLD = 0x16,
	101	HIF_REG_PAUSE_THRESHOLD_DEFAULT = 0,
	102	};
	103
76802851 AM	104	/* Trailing status byte in Ethernet Rx frame */
	105	enum {
	106	MCS7830_RX_SHORT_FRAME = 0x01, /* < 64 bytes */
	107	MCS7830_RX_LENGTH_ERROR = 0x02, /* framelen != Ethernet length field */
	108	MCS7830_RX_ALIGNMENT_ERROR = 0x04, /* non-even number of nibbles */
	109	MCS7830_RX_CRC_ERROR = 0x08,
	110	MCS7830_RX_LARGE_FRAME = 0x10, /* > 1518 bytes */
	111	MCS7830_RX_FRAME_CORRECT = 0x20, /* frame is correct */
	112	/* [7:6] reserved */
	113	};
	114
2a36d708 AB	115	struct mcs7830_data {
	116	u8 multi_filter[8];
	117	u8 config;
	118	};
	119
	120	static const char driver_name[] = "MOSCHIP usb-ethernet driver";
	121
	122	static int mcs7830_get_reg(struct usbnet dev, u16 index, u16 size, void data)
	123	{
9c06a2b5 ML	124	return usbnet_read_cmd(dev, MCS7830_RD_BREQ, MCS7830_RD_BMREQ,
9c06a2b5 ML	125	0x0000, index, data, size);
2a36d708 AB	126	}
2a36d708 AB	127
ace2a4d0	128	static int mcs7830_set_reg(struct usbnet dev, u16 index, u16 size, const void data)
2a36d708	129	{
9c06a2b5 ML	130	return usbnet_write_cmd(dev, MCS7830_WR_BREQ, MCS7830_WR_BMREQ,
9c06a2b5 ML	131	0x0000, index, data, size);
2a36d708 AB	132	}
	133
	134	static void mcs7830_set_reg_async(struct usbnet dev, u16 index, u16 size, void data)
	135	{
9c06a2b5 ML	136	usbnet_write_cmd_async(dev, MCS7830_WR_BREQ, MCS7830_WR_BMREQ,
9c06a2b5 ML	137	0x0000, index, data, size);
2a36d708 AB	138	}
2a36d708 AB	139
ace2a4d0 AM	140	static int mcs7830_hif_get_mac_address(struct usbnet dev, unsigned char addr)
	141	{
	142	int ret = mcs7830_get_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN, addr);
	143	if (ret < 0)
	144	return ret;
	145	return 0;
	146	}
	147
	148	static int mcs7830_hif_set_mac_address(struct usbnet dev, unsigned char addr)
	149	{
	150	int ret = mcs7830_set_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN, addr);
	151
	152	if (ret < 0)
	153	return ret;
	154	return 0;
	155	}
	156
	157	static int mcs7830_set_mac_address(struct net_device netdev, void p)
2a36d708 AB	158	{
2a36d708 AB	159	int ret;
ace2a4d0 AM	160	struct usbnet *dev = netdev_priv(netdev);
	161	struct sockaddr *addr = p;
	162
	163	if (netif_running(netdev))
	164	return -EBUSY;
	165
	166	if (!is_valid_ether_addr(addr->sa_data))
15b8f4cf	167	return -EADDRNOTAVAIL;
ace2a4d0 AM	168
	169	ret = mcs7830_hif_set_mac_address(dev, addr->sa_data);
	170
2a36d708 AB	171	if (ret < 0)
2a36d708 AB	172	return ret;
ace2a4d0 AM	173
	174	/* it worked --> adopt it on netdev side */
	175	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
	176
2a36d708 AB	177	return 0;
	178	}
	179
	180	static int mcs7830_read_phy(struct usbnet *dev, u8 index)
	181	{
	182	int ret;
	183	int i;
	184	__le16 val;
	185
	186	u8 cmd[2] = {
	187	HIF_REG_PHY_CMD1_READ \| HIF_REG_PHY_CMD1_PHYADDR,
	188	HIF_REG_PHY_CMD2_PEND_FLAG_BIT \| index,
	189	};
	190
a9fc6338	191	mutex_lock(&dev->phy_mutex);
2a36d708 AB	192	/* write the MII command */
	193	ret = mcs7830_set_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
	194	if (ret < 0)
	195	goto out;
	196
	197	/* wait for the data to become valid, should be within < 1ms */
	198	for (i = 0; i < 10; i++) {
	199	ret = mcs7830_get_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
	200	if ((ret < 0) \|\| (cmd[1] & HIF_REG_PHY_CMD2_READY_FLAG_BIT))
	201	break;
	202	ret = -EIO;
	203	msleep(1);
	204	}
	205	if (ret < 0)
	206	goto out;
	207
	208	/* read actual register contents */
	209	ret = mcs7830_get_reg(dev, HIF_REG_PHY_DATA, 2, &val);
	210	if (ret < 0)
	211	goto out;
	212	ret = le16_to_cpu(val);
	213	dev_dbg(&dev->udev->dev, "read PHY reg %02x: %04x (%d tries)\n",
	214	index, val, i);
	215	out:
a9fc6338	216	mutex_unlock(&dev->phy_mutex);
2a36d708 AB	217	return ret;
	218	}
	219
	220	static int mcs7830_write_phy(struct usbnet *dev, u8 index, u16 val)
	221	{
	222	int ret;
	223	int i;
	224	__le16 le_val;
	225
	226	u8 cmd[2] = {
	227	HIF_REG_PHY_CMD1_WRITE \| HIF_REG_PHY_CMD1_PHYADDR,
	228	HIF_REG_PHY_CMD2_PEND_FLAG_BIT \| (index & 0x1F),
	229	};
	230
a9fc6338 AB	231	mutex_lock(&dev->phy_mutex);
a9fc6338 AB	232
2a36d708 AB	233	/* write the new register contents */
	234	le_val = cpu_to_le16(val);
	235	ret = mcs7830_set_reg(dev, HIF_REG_PHY_DATA, 2, &le_val);
	236	if (ret < 0)
	237	goto out;
	238
	239	/* write the MII command */
	240	ret = mcs7830_set_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
	241	if (ret < 0)
	242	goto out;
	243
	244	/* wait for the command to be accepted by the PHY */
	245	for (i = 0; i < 10; i++) {
	246	ret = mcs7830_get_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
	247	if ((ret < 0) \|\| (cmd[1] & HIF_REG_PHY_CMD2_READY_FLAG_BIT))
	248	break;
	249	ret = -EIO;
	250	msleep(1);
	251	}
	252	if (ret < 0)
	253	goto out;
	254
	255	ret = 0;
	256	dev_dbg(&dev->udev->dev, "write PHY reg %02x: %04x (%d tries)\n",
	257	index, val, i);
	258	out:
a9fc6338	259	mutex_unlock(&dev->phy_mutex);
2a36d708 AB	260	return ret;
	261	}
	262
	263	/*
	264	* This algorithm comes from the original mcs7830 version 1.4 driver,
	265	* not sure if it is needed.
	266	*/
	267	static int mcs7830_set_autoneg(struct usbnet *dev, int ptrUserPhyMode)
	268	{
	269	int ret;
	270	/* Enable all media types */
	271	ret = mcs7830_write_phy(dev, MII_ADVERTISE, MCS7830_MII_ADVERTISE);
	272
	273	/* First reset BMCR */
	274	if (!ret)
	275	ret = mcs7830_write_phy(dev, MII_BMCR, 0x0000);
	276	/* Enable Auto Neg */
	277	if (!ret)
	278	ret = mcs7830_write_phy(dev, MII_BMCR, BMCR_ANENABLE);
	279	/* Restart Auto Neg (Keep the Enable Auto Neg Bit Set) */
	280	if (!ret)
	281	ret = mcs7830_write_phy(dev, MII_BMCR,
	282	BMCR_ANENABLE \| BMCR_ANRESTART );
0e214ad8	283	return ret;
2a36d708 AB	284	}
	285
	286
	287	/*
	288	* if we can read register 22, the chip revision is C or higher
	289	*/
	290	static int mcs7830_get_rev(struct usbnet *dev)
	291	{
	292	u8 dummy[2];
	293	int ret;
c774651a	294	ret = mcs7830_get_reg(dev, HIF_REG_FRAME_DROP_COUNTER, 2, dummy);
2a36d708 AB	295	if (ret > 0)
	296	return 2; /* Rev C or later */
	297	return 1; /* earlier revision */
	298	}
	299
	300	/*
	301	* On rev. C we need to set the pause threshold
	302	*/
	303	static void mcs7830_rev_C_fixup(struct usbnet *dev)
	304	{
	305	u8 pause_threshold = HIF_REG_PAUSE_THRESHOLD_DEFAULT;
	306	int retry;
	307
	308	for (retry = 0; retry < 2; retry++) {
	309	if (mcs7830_get_rev(dev) == 2) {
	310	dev_info(&dev->udev->dev, "applying rev.C fixup\n");
	311	mcs7830_set_reg(dev, HIF_REG_PAUSE_THRESHOLD,
	312	1, &pause_threshold);
	313	}
	314	msleep(1);
	315	}
	316	}
	317
2a36d708 AB	318	static int mcs7830_mdio_read(struct net_device *netdev, int phy_id,
	319	int location)
	320	{
8f15ea42	321	struct usbnet *dev = netdev_priv(netdev);
2a36d708 AB	322	return mcs7830_read_phy(dev, location);
	323	}
	324
	325	static void mcs7830_mdio_write(struct net_device *netdev, int phy_id,
	326	int location, int val)
	327	{
8f15ea42	328	struct usbnet *dev = netdev_priv(netdev);
2a36d708 AB	329	mcs7830_write_phy(dev, location, val);
	330	}
	331
	332	static int mcs7830_ioctl(struct net_device net, struct ifreq rq, int cmd)
	333	{
	334	struct usbnet *dev = netdev_priv(net);
	335	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
	336	}
	337
ace2a4d0 AM	338	static inline struct mcs7830_data mcs7830_get_data(struct usbnet dev)
	339	{
	340	return (struct mcs7830_data *)&dev->data;
	341	}
	342
	343	static void mcs7830_hif_update_multicast_hash(struct usbnet *dev)
	344	{
	345	struct mcs7830_data *data = mcs7830_get_data(dev);
	346	mcs7830_set_reg_async(dev, HIF_REG_MULTICAST_HASH,
	347	sizeof data->multi_filter,
	348	data->multi_filter);
	349	}
	350
	351	static void mcs7830_hif_update_config(struct usbnet *dev)
	352	{
	353	/* implementation specific to data->config
	354	(argument needs to be heap-based anyway - USB DMA!) */
	355	struct mcs7830_data *data = mcs7830_get_data(dev);
	356	mcs7830_set_reg_async(dev, HIF_REG_CONFIG, 1, &data->config);
	357	}
	358
	359	static void mcs7830_data_set_multicast(struct net_device *net)
2a36d708 AB	360	{
2a36d708 AB	361	struct usbnet *dev = netdev_priv(net);
ace2a4d0 AM	362	struct mcs7830_data *data = mcs7830_get_data(dev);
	363
	364	memset(data->multi_filter, 0, sizeof data->multi_filter);
2a36d708 AB	365
	366	data->config = HIF_REG_CONFIG_TXENABLE;
	367
	368	/* this should not be needed, but it doesn't work otherwise */
	369	data->config \|= HIF_REG_CONFIG_ALLMULTICAST;
	370
	371	if (net->flags & IFF_PROMISC) {
00e49913	372	data->config \|= HIF_REG_CONFIG_PROMISCUOUS;
8e95a202	373	} else if (net->flags & IFF_ALLMULTI \|\|
4cd24eaf	374	netdev_mc_count(net) > MCS7830_MAX_MCAST) {
2a36d708	375	data->config \|= HIF_REG_CONFIG_ALLMULTICAST;
4cd24eaf	376	} else if (netdev_mc_empty(net)) {
2a36d708 AB	377	/* just broadcast and directed */
	378	} else {
	379	/* We use the 20 byte dev->data
	380	* for our 8 byte filter buffer
	381	* to avoid allocating memory that
	382	* is tricky to free later */
22bedad3	383	struct netdev_hw_addr *ha;
2a36d708	384	u32 crc_bits;
2a36d708	385
2a36d708	386	/* Build the multicast hash filter. */
22bedad3 JP	387	netdev_for_each_mc_addr(ha, net) {
22bedad3 JP	388	crc_bits = ether_crc(ETH_ALEN, ha->addr) >> 26;
2a36d708	389	data->multi_filter[crc_bits >> 3] \|= 1 << (crc_bits & 7);
2a36d708	390	}
ace2a4d0 AM	391	}
ace2a4d0 AM	392	}
2a36d708	393
ace2a4d0 AM	394	static int mcs7830_apply_base_config(struct usbnet *dev)
	395	{
	396	int ret;
	397
	398	/* re-configure known MAC (suspend case etc.) */
	399	ret = mcs7830_hif_set_mac_address(dev, dev->net->dev_addr);
	400	if (ret) {
	401	dev_info(&dev->udev->dev, "Cannot set MAC address\n");
	402	goto out;
2a36d708 AB	403	}
2a36d708 AB	404
ace2a4d0 AM	405	/* Set up PHY */
	406	ret = mcs7830_set_autoneg(dev, 0);
	407	if (ret) {
	408	dev_info(&dev->udev->dev, "Cannot set autoneg\n");
	409	goto out;
	410	}
	411
	412	mcs7830_hif_update_multicast_hash(dev);
	413	mcs7830_hif_update_config(dev);
	414
	415	mcs7830_rev_C_fixup(dev);
	416	ret = 0;
	417	out:
	418	return ret;
	419	}
	420
	421	/* credits go to asix_set_multicast */
	422	static void mcs7830_set_multicast(struct net_device *net)
	423	{
	424	struct usbnet *dev = netdev_priv(net);
	425
	426	mcs7830_data_set_multicast(net);
	427
	428	mcs7830_hif_update_multicast_hash(dev);
	429	mcs7830_hif_update_config(dev);
2a36d708 AB	430	}
	431
	432	static int mcs7830_get_regs_len(struct net_device *net)
	433	{
	434	struct usbnet *dev = netdev_priv(net);
	435
	436	switch (mcs7830_get_rev(dev)) {
	437	case 1:
	438	return 21;
	439	case 2:
	440	return 32;
	441	}
	442	return 0;
	443	}
	444
	445	static void mcs7830_get_drvinfo(struct net_device net, struct ethtool_drvinfo drvinfo)
	446	{
	447	usbnet_get_drvinfo(net, drvinfo);
2a36d708 AB	448	}
	449
	450	static void mcs7830_get_regs(struct net_device net, struct ethtool_regs regs, void *data)
	451	{
	452	struct usbnet *dev = netdev_priv(net);
	453
	454	regs->version = mcs7830_get_rev(dev);
	455	mcs7830_get_reg(dev, 0, regs->len, data);
	456	}
	457
0fc0b732	458	static const struct ethtool_ops mcs7830_ethtool_ops = {
2a36d708 AB	459	.get_drvinfo = mcs7830_get_drvinfo,
	460	.get_regs_len = mcs7830_get_regs_len,
	461	.get_regs = mcs7830_get_regs,
	462
	463	/* common usbnet calls */
c41286fd	464	.get_link = usbnet_get_link,
2a36d708 AB	465	.get_msglevel = usbnet_get_msglevel,
2a36d708 AB	466	.set_msglevel = usbnet_set_msglevel,
c41286fd AB	467	.get_settings = usbnet_get_settings,
	468	.set_settings = usbnet_set_settings,
	469	.nway_reset = usbnet_nway_reset,
2a36d708 AB	470	};
2a36d708 AB	471
e12c4f83 SH	472	static const struct net_device_ops mcs7830_netdev_ops = {
	473	.ndo_open = usbnet_open,
	474	.ndo_stop = usbnet_stop,
	475	.ndo_start_xmit = usbnet_start_xmit,
	476	.ndo_tx_timeout = usbnet_tx_timeout,
	477	.ndo_change_mtu = usbnet_change_mtu,
	478	.ndo_validate_addr = eth_validate_addr,
	479	.ndo_do_ioctl = mcs7830_ioctl,
afc4b13d	480	.ndo_set_rx_mode = mcs7830_set_multicast,
00e49913	481	.ndo_set_mac_address = mcs7830_set_mac_address,
e12c4f83 SH	482	};
e12c4f83 SH	483
2a36d708 AB	484	static int mcs7830_bind(struct usbnet dev, struct usb_interface udev)
	485	{
	486	struct net_device *net = dev->net;
	487	int ret;
ace2a4d0	488	int retry;
2a36d708	489
ace2a4d0 AM	490	/* Initial startup: Gather MAC address setting from EEPROM */
	491	ret = -EINVAL;
	492	for (retry = 0; retry < 5 && ret; retry++)
	493	ret = mcs7830_hif_get_mac_address(dev, net->dev_addr);
	494	if (ret) {
	495	dev_warn(&dev->udev->dev, "Cannot read MAC address\n");
	496	goto out;
	497	}
	498
	499	mcs7830_data_set_multicast(net);
	500
	501	ret = mcs7830_apply_base_config(dev);
2a36d708 AB	502	if (ret)
	503	goto out;
	504
2a36d708	505	net->ethtool_ops = &mcs7830_ethtool_ops;
e12c4f83	506	net->netdev_ops = &mcs7830_netdev_ops;
2a36d708 AB	507
	508	/* reserve space for the status byte on rx */
	509	dev->rx_urb_size = ETH_FRAME_LEN + 1;
	510
	511	dev->mii.mdio_read = mcs7830_mdio_read;
	512	dev->mii.mdio_write = mcs7830_mdio_write;
	513	dev->mii.dev = net;
	514	dev->mii.phy_id_mask = 0x3f;
	515	dev->mii.reg_num_mask = 0x1f;
	516	dev->mii.phy_id = ((u8 ) net->dev_addr + 1);
	517
	518	ret = usbnet_get_endpoints(dev, udev);
	519	out:
	520	return ret;
	521	}
	522
00e49913	523	/* The chip always appends a status byte that we need to strip */
2a36d708 AB	524	static int mcs7830_rx_fixup(struct usbnet dev, struct sk_buff skb)
	525	{
	526	u8 status;
	527
eb85569f EG	528	/* This check is no longer done by usbnet */
	529	if (skb->len < dev->net->hard_header_len) {
	530	dev_err(&dev->udev->dev, "unexpected tiny rx frame\n");
2a36d708 AB	531	return 0;
	532	}
	533
	534	skb_trim(skb, skb->len - 1);
	535	status = skb->data[skb->len];
	536
76802851	537	if (status != MCS7830_RX_FRAME_CORRECT) {
2a36d708 AB	538	dev_dbg(&dev->udev->dev, "rx fixup status %x\n", status);
2a36d708 AB	539
76802851 AM	540	/* hmm, perhaps usbnet.c already sees a globally visible
	541	frame error and increments rx_errors on its own already? */
	542	dev->net->stats.rx_errors++;
	543
	544	if (status & (MCS7830_RX_SHORT_FRAME
	545	\|MCS7830_RX_LENGTH_ERROR
	546	\|MCS7830_RX_LARGE_FRAME))
	547	dev->net->stats.rx_length_errors++;
	548	if (status & MCS7830_RX_ALIGNMENT_ERROR)
	549	dev->net->stats.rx_frame_errors++;
	550	if (status & MCS7830_RX_CRC_ERROR)
	551	dev->net->stats.rx_crc_errors++;
	552	}
	553
2a36d708 AB	554	return skb->len > 0;
	555	}
	556
b1ff4f96 OZ	557	static void mcs7830_status(struct usbnet dev, struct urb urb)
	558	{
	559	u8 *buf = urb->transfer_buffer;
dabdaf0c	560	bool link, link_changed;
b1ff4f96 OZ	561
	562	if (urb->actual_length < 16)
	563	return;
	564
8d88bbff	565	link = !(buf[1] == 0x20);
dabdaf0c OZ	566	link_changed = netif_carrier_ok(dev->net) != link;
dabdaf0c OZ	567	if (link_changed) {
8d88bbff OP	568	usbnet_link_change(dev, link, 0);
	569	netdev_dbg(dev->net, "Link Status is: %d\n", link);
	570	}
b1ff4f96 OZ	571	}
b1ff4f96 OZ	572
2a36d708	573	static const struct driver_info moschip_info = {
bbccc16c	574	.description = "MOSCHIP 7830/7832/7730 usb-NET adapter",
8382cc1c AB	575	.bind = mcs7830_bind,
8382cc1c AB	576	.rx_fixup = mcs7830_rx_fixup,
b1ff4f96 OZ	577	.flags = FLAG_ETHER \| FLAG_LINK_INTR,
b1ff4f96 OZ	578	.status = mcs7830_status,
8382cc1c AB	579	.in = 1,
	580	.out = 2,
	581	};
	582
	583	static const struct driver_info sitecom_info = {
	584	.description = "Sitecom LN-30 usb-NET adapter",
2a36d708 AB	585	.bind = mcs7830_bind,
2a36d708 AB	586	.rx_fixup = mcs7830_rx_fixup,
b1ff4f96 OZ	587	.flags = FLAG_ETHER \| FLAG_LINK_INTR,
b1ff4f96 OZ	588	.status = mcs7830_status,
2a36d708 AB	589	.in = 1,
	590	.out = 2,
	591	};
	592
	593	static const struct usb_device_id products[] = {
bbccc16c AM	594	{
	595	USB_DEVICE(MCS7830_VENDOR_ID, MCS7832_PRODUCT_ID),
	596	.driver_info = (unsigned long) &moschip_info,
	597	},
2a36d708 AB	598	{
	599	USB_DEVICE(MCS7830_VENDOR_ID, MCS7830_PRODUCT_ID),
	600	.driver_info = (unsigned long) &moschip_info,
	601	},
8382cc1c AB	602	{
	603	USB_DEVICE(MCS7830_VENDOR_ID, MCS7730_PRODUCT_ID),
	604	.driver_info = (unsigned long) &moschip_info,
	605	},
	606	{
	607	USB_DEVICE(SITECOM_VENDOR_ID, LN_030_PRODUCT_ID),
	608	.driver_info = (unsigned long) &sitecom_info,
	609	},
2a36d708 AB	610	{},
	611	};
	612	MODULE_DEVICE_TABLE(usb, products);
	613
ace2a4d0 AM	614	static int mcs7830_reset_resume (struct usb_interface *intf)
	615	{
	616	/* YES, this function is successful enough that ethtool -d
	617	does show same output pre-/post-suspend */
	618
	619	struct usbnet *dev = usb_get_intfdata(intf);
	620
	621	mcs7830_apply_base_config(dev);
	622
	623	usbnet_resume(intf);
	624
	625	return 0;
	626	}
	627
2a36d708 AB	628	static struct usb_driver mcs7830_driver = {
	629	.name = driver_name,
	630	.id_table = products,
	631	.probe = usbnet_probe,
	632	.disconnect = usbnet_disconnect,
	633	.suspend = usbnet_suspend,
	634	.resume = usbnet_resume,
ace2a4d0	635	.reset_resume = mcs7830_reset_resume,
e1f12eb6	636	.disable_hub_initiated_lpm = 1,
2a36d708 AB	637	};
2a36d708 AB	638
d632eb1b	639	module_usb_driver(mcs7830_driver);
2a36d708 AB	640
	641	MODULE_DESCRIPTION("USB to network adapter MCS7830)");
	642	MODULE_LICENSE("GPL");