xref: /openbmc/linux/drivers/net/usb/asix_common.c (revision af9b2ff010f593d81e2f5fb04155e9fc25b9dfd0)

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * ASIX AX8817X based USB 2.0 Ethernet Devices
 * Copyright (C) 2003-2006 David Hollis <dhollis@davehollis.com>
 * Copyright (C) 2005 Phil Chang <pchang23@sbcglobal.net>
 * Copyright (C) 2006 James Painter <jamie.painter@iname.com>
 * Copyright (c) 2002-2003 TiVo Inc.
 */

#include "asix.h"

#define AX_HOST_EN_RETRIES	30

int __must_check asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
			       u16 size, void *data, int in_pm)
{
	int ret;
	int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);

	BUG_ON(!dev);

	if (!in_pm)
		fn = usbnet_read_cmd;
	else
		fn = usbnet_read_cmd_nopm;

	ret = fn(dev, cmd, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
		 value, index, data, size);

	if (unlikely(ret < size)) {
		ret = ret < 0 ? ret : -ENODATA;

		netdev_warn(dev->net, "Failed to read reg index 0x%04x: %d\n",
			    index, ret);
	}

	return ret;
}

int asix_write_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
		   u16 size, void *data, int in_pm)
{
	int ret;
	int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);

	BUG_ON(!dev);

	if (!in_pm)
		fn = usbnet_write_cmd;
	else
		fn = usbnet_write_cmd_nopm;

	ret = fn(dev, cmd, USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
		 value, index, data, size);

	if (unlikely(ret < 0))
		netdev_warn(dev->net, "Failed to write reg index 0x%04x: %d\n",
			    index, ret);

	return ret;
}

void asix_write_cmd_async(struct usbnet *dev, u8 cmd, u16 value, u16 index,
			  u16 size, void *data)
{
	usbnet_write_cmd_async(dev, cmd,
			       USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			       value, index, data, size);
}

static int asix_set_sw_mii(struct usbnet *dev, int in_pm)
{
	int ret;

	ret = asix_write_cmd(dev, AX_CMD_SET_SW_MII, 0x0000, 0, 0, NULL, in_pm);

	if (ret < 0)
		netdev_err(dev->net, "Failed to enable software MII access\n");
	return ret;
}

static int asix_set_hw_mii(struct usbnet *dev, int in_pm)
{
	int ret;

	ret = asix_write_cmd(dev, AX_CMD_SET_HW_MII, 0x0000, 0, 0, NULL, in_pm);
	if (ret < 0)
		netdev_err(dev->net, "Failed to enable hardware MII access\n");
	return ret;
}

static int asix_check_host_enable(struct usbnet *dev, int in_pm)
{
	int i, ret;
	u8 smsr;

	for (i = 0; i < AX_HOST_EN_RETRIES; ++i) {
		ret = asix_set_sw_mii(dev, in_pm);
		if (ret == -ENODEV || ret == -ETIMEDOUT)
			break;
		usleep_range(1000, 1100);
		ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG,
				    0, 0, 1, &smsr, in_pm);
		if (ret == -ENODEV)
			break;
		else if (ret < 0)
			continue;
		else if (smsr & AX_HOST_EN)
			break;
	}

	return i >= AX_HOST_EN_RETRIES ? -ETIMEDOUT : ret;
}

static void reset_asix_rx_fixup_info(struct asix_rx_fixup_info *rx)
{
	/* Reset the variables that have a lifetime outside of
	 * asix_rx_fixup_internal() so that future processing starts from a
	 * known set of initial conditions.
	 */

	if (rx->ax_skb) {
		/* Discard any incomplete Ethernet frame in the netdev buffer */
		kfree_skb(rx->ax_skb);
		rx->ax_skb = NULL;
	}

	/* Assume the Data header 32-bit word is at the start of the current
	 * or next URB socket buffer so reset all the state variables.
	 */
	rx->remaining = 0;
	rx->split_head = false;
	rx->header = 0;
}

int asix_rx_fixup_internal(struct usbnet *dev, struct sk_buff *skb,
			   struct asix_rx_fixup_info *rx)
{
	int offset = 0;
	u16 size;

	/* When an Ethernet frame spans multiple URB socket buffers,
	 * do a sanity test for the Data header synchronisation.
	 * Attempt to detect the situation of the previous socket buffer having
	 * been truncated or a socket buffer was missing. These situations
	 * cause a discontinuity in the data stream and therefore need to avoid
	 * appending bad data to the end of the current netdev socket buffer.
	 * Also avoid unnecessarily discarding a good current netdev socket
	 * buffer.
	 */
	if (rx->remaining && (rx->remaining + sizeof(u32) <= skb->len)) {
		offset = ((rx->remaining + 1) & 0xfffe);
		rx->header = get_unaligned_le32(skb->data + offset);
		offset = 0;

		size = (u16)(rx->header & 0x7ff);
		if (size != ((~rx->header >> 16) & 0x7ff)) {
			netdev_err(dev->net, "asix_rx_fixup() Data Header synchronisation was lost, remaining %d\n",
				   rx->remaining);
			reset_asix_rx_fixup_info(rx);
		}
	}

	while (offset + sizeof(u16) <= skb->len) {
		u16 copy_length;

		if (!rx->remaining) {
			if (skb->len - offset == sizeof(u16)) {
				rx->header = get_unaligned_le16(
						skb->data + offset);
				rx->split_head = true;
				offset += sizeof(u16);
				break;
			}

			if (rx->split_head == true) {
				rx->header |= (get_unaligned_le16(
						skb->data + offset) << 16);
				rx->split_head = false;
				offset += sizeof(u16);
			} else {
				rx->header = get_unaligned_le32(skb->data +
								offset);
				offset += sizeof(u32);
			}

			/* take frame length from Data header 32-bit word */
			size = (u16)(rx->header & 0x7ff);
			if (size != ((~rx->header >> 16) & 0x7ff)) {
				netdev_err(dev->net, "asix_rx_fixup() Bad Header Length 0x%x, offset %d\n",
					   rx->header, offset);
				reset_asix_rx_fixup_info(rx);
				return 0;
			}
			if (size > dev->net->mtu + ETH_HLEN + VLAN_HLEN) {
				netdev_dbg(dev->net, "asix_rx_fixup() Bad RX Length %d\n",
					   size);
				reset_asix_rx_fixup_info(rx);
				return 0;
			}

			/* Sometimes may fail to get a netdev socket buffer but
			 * continue to process the URB socket buffer so that
			 * synchronisation of the Ethernet frame Data header
			 * word is maintained.
			 */
			rx->ax_skb = netdev_alloc_skb_ip_align(dev->net, size);

			rx->remaining = size;
		}

		if (rx->remaining > skb->len - offset) {
			copy_length = skb->len - offset;
			rx->remaining -= copy_length;
		} else {
			copy_length = rx->remaining;
			rx->remaining = 0;
		}

		if (rx->ax_skb) {
			skb_put_data(rx->ax_skb, skb->data + offset,
				     copy_length);
			if (!rx->remaining) {
				usbnet_skb_return(dev, rx->ax_skb);
				rx->ax_skb = NULL;
			}
		}

		offset += (copy_length + 1) & 0xfffe;
	}

	if (skb->len != offset) {
		netdev_err(dev->net, "asix_rx_fixup() Bad SKB Length %d, %d\n",
			   skb->len, offset);
		reset_asix_rx_fixup_info(rx);
		return 0;
	}

	return 1;
}

int asix_rx_fixup_common(struct usbnet *dev, struct sk_buff *skb)
{
	struct asix_common_private *dp = dev->driver_priv;
	struct asix_rx_fixup_info *rx = &dp->rx_fixup_info;

	return asix_rx_fixup_internal(dev, skb, rx);
}

void asix_rx_fixup_common_free(struct asix_common_private *dp)
{
	struct asix_rx_fixup_info *rx;

	if (!dp)
		return;

	rx = &dp->rx_fixup_info;

	if (rx->ax_skb) {
		kfree_skb(rx->ax_skb);
		rx->ax_skb = NULL;
	}
}

struct sk_buff *asix_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
			      gfp_t flags)
{
	int padlen;
	int headroom = skb_headroom(skb);
	int tailroom = skb_tailroom(skb);
	u32 packet_len;
	u32 padbytes = 0xffff0000;
	void *ptr;

	padlen = ((skb->len + 4) & (dev->maxpacket - 1)) ? 0 : 4;

	/* We need to push 4 bytes in front of frame (packet_len)
	 * and maybe add 4 bytes after the end (if padlen is 4)
	 *
	 * Avoid skb_copy_expand() expensive call, using following rules :
	 * - We are allowed to push 4 bytes in headroom if skb_header_cloned()
	 *   is false (and if we have 4 bytes of headroom)
	 * - We are allowed to put 4 bytes at tail if skb_cloned()
	 *   is false (and if we have 4 bytes of tailroom)
	 *
	 * TCP packets for example are cloned, but __skb_header_release()
	 * was called in tcp stack, allowing us to use headroom for our needs.
	 */
	if (!skb_header_cloned(skb) &&
	    !(padlen && skb_cloned(skb)) &&
	    headroom + tailroom >= 4 + padlen) {
		/* following should not happen, but better be safe */
		if (headroom < 4 ||
		    tailroom < padlen) {
			skb->data = memmove(skb->head + 4, skb->data, skb->len);
			skb_set_tail_pointer(skb, skb->len);
		}
	} else {
		struct sk_buff *skb2;

		skb2 = skb_copy_expand(skb, 4, padlen, flags);
		dev_kfree_skb_any(skb);
		skb = skb2;
		if (!skb)
			return NULL;
	}

	packet_len = ((skb->len ^ 0x0000ffff) << 16) + skb->len;
	ptr = skb_push(skb, 4);
	put_unaligned_le32(packet_len, ptr);

	if (padlen) {
		put_unaligned_le32(padbytes, skb_tail_pointer(skb));
		skb_put(skb, sizeof(padbytes));
	}

	usbnet_set_skb_tx_stats(skb, 1, 0);
	return skb;
}

int asix_read_phy_addr(struct usbnet *dev, bool internal)
{
	int ret, offset;
	u8 buf[2];

	ret = asix_read_cmd(dev, AX_CMD_READ_PHY_ID, 0, 0, 2, buf, 0);
	if (ret < 0)
		goto error;

	if (ret < 2) {
		ret = -EIO;
		goto error;
	}

	offset = (internal ? 1 : 0);
	ret = buf[offset];

	netdev_dbg(dev->net, "%s PHY address 0x%x\n",
		   internal ? "internal" : "external", ret);

	return ret;

error:
	netdev_err(dev->net, "Error reading PHY_ID register: %02x\n", ret);

	return ret;
}

int asix_sw_reset(struct usbnet *dev, u8 flags, int in_pm)
{
	int ret;

	ret = asix_write_cmd(dev, AX_CMD_SW_RESET, flags, 0, 0, NULL, in_pm);
	if (ret < 0)
		netdev_err(dev->net, "Failed to send software reset: %02x\n", ret);

	return ret;
}

u16 asix_read_rx_ctl(struct usbnet *dev, int in_pm)
{
	__le16 v;
	int ret = asix_read_cmd(dev, AX_CMD_READ_RX_CTL, 0, 0, 2, &v, in_pm);

	if (ret < 0) {
		netdev_err(dev->net, "Error reading RX_CTL register: %02x\n", ret);
		goto out;
	}
	ret = le16_to_cpu(v);
out:
	return ret;
}

int asix_write_rx_ctl(struct usbnet *dev, u16 mode, int in_pm)
{
	int ret;

	netdev_dbg(dev->net, "asix_write_rx_ctl() - mode = 0x%04x\n", mode);
	ret = asix_write_cmd(dev, AX_CMD_WRITE_RX_CTL, mode, 0, 0, NULL, in_pm);
	if (ret < 0)
		netdev_err(dev->net, "Failed to write RX_CTL mode to 0x%04x: %02x\n",
			   mode, ret);

	return ret;
}

u16 asix_read_medium_status(struct usbnet *dev, int in_pm)
{
	__le16 v;
	int ret = asix_read_cmd(dev, AX_CMD_READ_MEDIUM_STATUS,
				0, 0, 2, &v, in_pm);

	if (ret < 0) {
		netdev_err(dev->net, "Error reading Medium Status register: %02x\n",
			   ret);
		return ret;	/* TODO: callers not checking for error ret */
	}

	return le16_to_cpu(v);

}

int asix_write_medium_mode(struct usbnet *dev, u16 mode, int in_pm)
{
	int ret;

	netdev_dbg(dev->net, "asix_write_medium_mode() - mode = 0x%04x\n", mode);
	ret = asix_write_cmd(dev, AX_CMD_WRITE_MEDIUM_MODE,
			     mode, 0, 0, NULL, in_pm);
	if (ret < 0)
		netdev_err(dev->net, "Failed to write Medium Mode mode to 0x%04x: %02x\n",
			   mode, ret);

	return ret;
}

int asix_write_gpio(struct usbnet *dev, u16 value, int sleep, int in_pm)
{
	int ret;

	netdev_dbg(dev->net, "asix_write_gpio() - value = 0x%04x\n", value);
	ret = asix_write_cmd(dev, AX_CMD_WRITE_GPIOS, value, 0, 0, NULL, in_pm);
	if (ret < 0)
		netdev_err(dev->net, "Failed to write GPIO value 0x%04x: %02x\n",
			   value, ret);

	if (sleep)
		msleep(sleep);

	return ret;
}

/*
 * AX88772 & AX88178 have a 16-bit RX_CTL value
 */
void asix_set_multicast(struct net_device *net)
{
	struct usbnet *dev = netdev_priv(net);
	struct asix_data *data = (struct asix_data *)&dev->data;
	u16 rx_ctl = AX_DEFAULT_RX_CTL;

	if (net->flags & IFF_PROMISC) {
		rx_ctl |= AX_RX_CTL_PRO;
	} else if (net->flags & IFF_ALLMULTI ||
		   netdev_mc_count(net) > AX_MAX_MCAST) {
		rx_ctl |= AX_RX_CTL_AMALL;
	} 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;

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

		/* 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);
		}

		asix_write_cmd_async(dev, AX_CMD_WRITE_MULTI_FILTER, 0, 0,
				   AX_MCAST_FILTER_SIZE, data->multi_filter);

		rx_ctl |= AX_RX_CTL_AM;
	}

	asix_write_cmd_async(dev, AX_CMD_WRITE_RX_CTL, rx_ctl, 0, 0, NULL);
}

static int __asix_mdio_read(struct net_device *netdev, int phy_id, int loc,
			    bool in_pm)
{
	struct usbnet *dev = netdev_priv(netdev);
	__le16 res;
	int ret;

	mutex_lock(&dev->phy_mutex);

	ret = asix_check_host_enable(dev, in_pm);
	if (ret == -ENODEV || ret == -ETIMEDOUT) {
		mutex_unlock(&dev->phy_mutex);
		return ret;
	}

	ret = asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id, (__u16)loc, 2,
			    &res, in_pm);
	if (ret < 0)
		goto out;

	ret = asix_set_hw_mii(dev, in_pm);
out:
	mutex_unlock(&dev->phy_mutex);

	netdev_dbg(dev->net, "asix_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
			phy_id, loc, le16_to_cpu(res));

	return ret < 0 ? ret : le16_to_cpu(res);
}

int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
{
	return __asix_mdio_read(netdev, phy_id, loc, false);
}

static int __asix_mdio_write(struct net_device *netdev, int phy_id, int loc,
			     int val, bool in_pm)
{
	struct usbnet *dev = netdev_priv(netdev);
	__le16 res = cpu_to_le16(val);
	int ret;

	netdev_dbg(dev->net, "asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
			phy_id, loc, val);

	mutex_lock(&dev->phy_mutex);

	ret = asix_check_host_enable(dev, in_pm);
	if (ret == -ENODEV)
		goto out;

	ret = asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id, (__u16)loc, 2,
			     &res, in_pm);
	if (ret < 0)
		goto out;

	ret = asix_set_hw_mii(dev, in_pm);
out:
	mutex_unlock(&dev->phy_mutex);

	return ret < 0 ? ret : 0;
}

void asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val)
{
	__asix_mdio_write(netdev, phy_id, loc, val, false);
}

/* MDIO read and write wrappers for phylib */
int asix_mdio_bus_read(struct mii_bus *bus, int phy_id, int regnum)
{
	struct usbnet *priv = bus->priv;

	return __asix_mdio_read(priv->net, phy_id, regnum, false);
}

int asix_mdio_bus_write(struct mii_bus *bus, int phy_id, int regnum, u16 val)
{
	struct usbnet *priv = bus->priv;

	return __asix_mdio_write(priv->net, phy_id, regnum, val, false);
}

int asix_mdio_read_nopm(struct net_device *netdev, int phy_id, int loc)
{
	return __asix_mdio_read(netdev, phy_id, loc, true);
}

void
asix_mdio_write_nopm(struct net_device *netdev, int phy_id, int loc, int val)
{
	__asix_mdio_write(netdev, phy_id, loc, val, true);
}

void asix_get_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
{
	struct usbnet *dev = netdev_priv(net);
	u8 opt;

	if (asix_read_cmd(dev, AX_CMD_READ_MONITOR_MODE,
			  0, 0, 1, &opt, 0) < 0) {
		wolinfo->supported = 0;
		wolinfo->wolopts = 0;
		return;
	}
	wolinfo->supported = WAKE_PHY | WAKE_MAGIC;
	wolinfo->wolopts = 0;
	if (opt & AX_MONITOR_LINK)
		wolinfo->wolopts |= WAKE_PHY;
	if (opt & AX_MONITOR_MAGIC)
		wolinfo->wolopts |= WAKE_MAGIC;
}

int asix_set_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
{
	struct usbnet *dev = netdev_priv(net);
	u8 opt = 0;

	if (wolinfo->wolopts & ~(WAKE_PHY | WAKE_MAGIC))
		return -EINVAL;

	if (wolinfo->wolopts & WAKE_PHY)
		opt |= AX_MONITOR_LINK;
	if (wolinfo->wolopts & WAKE_MAGIC)
		opt |= AX_MONITOR_MAGIC;

	if (asix_write_cmd(dev, AX_CMD_WRITE_MONITOR_MODE,
			      opt, 0, 0, NULL, 0) < 0)
		return -EINVAL;

	return 0;
}

int asix_get_eeprom_len(struct net_device *net)
{
	return AX_EEPROM_LEN;
}

int asix_get_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom,
		    u8 *data)
{
	struct usbnet *dev = netdev_priv(net);
	u16 *eeprom_buff;
	int first_word, last_word;
	int i;

	if (eeprom->len == 0)
		return -EINVAL;

	eeprom->magic = AX_EEPROM_MAGIC;

	first_word = eeprom->offset >> 1;
	last_word = (eeprom->offset + eeprom->len - 1) >> 1;

	eeprom_buff = kmalloc_array(last_word - first_word + 1, sizeof(u16),
				    GFP_KERNEL);
	if (!eeprom_buff)
		return -ENOMEM;

	/* ax8817x returns 2 bytes from eeprom on read */
	for (i = first_word; i <= last_word; i++) {
		if (asix_read_cmd(dev, AX_CMD_READ_EEPROM, i, 0, 2,
				  &eeprom_buff[i - first_word], 0) < 0) {
			kfree(eeprom_buff);
			return -EIO;
		}
	}

	memcpy(data, (u8 *)eeprom_buff + (eeprom->offset & 1), eeprom->len);
	kfree(eeprom_buff);
	return 0;
}

int asix_set_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom,
		    u8 *data)
{
	struct usbnet *dev = netdev_priv(net);
	u16 *eeprom_buff;
	int first_word, last_word;
	int i;
	int ret;

	netdev_dbg(net, "write EEPROM len %d, offset %d, magic 0x%x\n",
		   eeprom->len, eeprom->offset, eeprom->magic);

	if (eeprom->len == 0)
		return -EINVAL;

	if (eeprom->magic != AX_EEPROM_MAGIC)
		return -EINVAL;

	first_word = eeprom->offset >> 1;
	last_word = (eeprom->offset + eeprom->len - 1) >> 1;

	eeprom_buff = kmalloc_array(last_word - first_word + 1, sizeof(u16),
				    GFP_KERNEL);
	if (!eeprom_buff)
		return -ENOMEM;

	/* align data to 16 bit boundaries, read the missing data from
	   the EEPROM */
	if (eeprom->offset & 1) {
		ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, first_word, 0, 2,
				    &eeprom_buff[0], 0);
		if (ret < 0) {
			netdev_err(net, "Failed to read EEPROM at offset 0x%02x.\n", first_word);
			goto free;
		}
	}

	if ((eeprom->offset + eeprom->len) & 1) {
		ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, last_word, 0, 2,
				    &eeprom_buff[last_word - first_word], 0);
		if (ret < 0) {
			netdev_err(net, "Failed to read EEPROM at offset 0x%02x.\n", last_word);
			goto free;
		}
	}

	memcpy((u8 *)eeprom_buff + (eeprom->offset & 1), data, eeprom->len);

	/* write data to EEPROM */
	ret = asix_write_cmd(dev, AX_CMD_WRITE_ENABLE, 0x0000, 0, 0, NULL, 0);
	if (ret < 0) {
		netdev_err(net, "Failed to enable EEPROM write\n");
		goto free;
	}
	msleep(20);

	for (i = first_word; i <= last_word; i++) {
		netdev_dbg(net, "write to EEPROM at offset 0x%02x, data 0x%04x\n",
			   i, eeprom_buff[i - first_word]);
		ret = asix_write_cmd(dev, AX_CMD_WRITE_EEPROM, i,
				     eeprom_buff[i - first_word], 0, NULL, 0);
		if (ret < 0) {
			netdev_err(net, "Failed to write EEPROM at offset 0x%02x.\n",
				   i);
			goto free;
		}
		msleep(20);
	}

	ret = asix_write_cmd(dev, AX_CMD_WRITE_DISABLE, 0x0000, 0, 0, NULL, 0);
	if (ret < 0) {
		netdev_err(net, "Failed to disable EEPROM write\n");
		goto free;
	}

	ret = 0;
free:
	kfree(eeprom_buff);
	return ret;
}

void asix_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
{
	/* Inherit standard device info */
	usbnet_get_drvinfo(net, info);
	strscpy(info->driver, DRIVER_NAME, sizeof(info->driver));
	strscpy(info->version, DRIVER_VERSION, sizeof(info->version));
}

int asix_set_mac_address(struct net_device *net, void *p)
{
	struct usbnet *dev = netdev_priv(net);
	struct asix_data *data = (struct asix_data *)&dev->data;
	struct sockaddr *addr = p;

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

	eth_hw_addr_set(net, addr->sa_data);

	/* We use the 20 byte dev->data
	 * for our 6 byte mac buffer
	 * to avoid allocating memory that
	 * is tricky to free later */
	memcpy(data->mac_addr, addr->sa_data, ETH_ALEN);
	asix_write_cmd_async(dev, AX_CMD_WRITE_NODE_ID, 0, 0, ETH_ALEN,
							data->mac_addr);

	return 0;
}