drivers/net/usb/asix_common.c - kernel/msm-4.19 - Gitiles

 /*
  * 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.
  *
  * 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 "asix.h"

 int asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
 		  u16 size, void *data)
 {
 	int ret;
 	ret = usbnet_read_cmd(dev, cmd,
 			       USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 			       value, index, data, size);

 	if (ret != size && ret >= 0)
 		return -EINVAL;
 	return ret;
 }

 int asix_write_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
 		   u16 size, void *data)
 {
 	return usbnet_write_cmd(dev, cmd,
 				USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 				value, index, data, size);
 }

 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);
 }

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

 	while (offset + sizeof(u16) <= skb->len) {
 		u16 remaining = 0;
 		unsigned char *data;

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

 			/* get the packet length */
 			rx->size = (u16) (rx->header & 0x7ff);
 			if (rx->size != ((~rx->header >> 16) & 0x7ff)) {
 				netdev_err(dev->net, "asix_rx_fixup() Bad Header Length 0x%x, offset %d\n",
 					   rx->header, offset);
 				rx->size = 0;
 				return 0;
 			}
 			rx->ax_skb = netdev_alloc_skb_ip_align(dev->net,
 							       rx->size);
 			if (!rx->ax_skb)
 				return 0;
 		}

 		if (rx->size > dev->net->mtu + ETH_HLEN + VLAN_HLEN) {
 			netdev_err(dev->net, "asix_rx_fixup() Bad RX Length %d\n",
 				   rx->size);
 			kfree_skb(rx->ax_skb);
 			return 0;
 		}

 		if (rx->size > skb->len - offset) {
 			remaining = rx->size - (skb->len - offset);
 			rx->size = skb->len - offset;
 		}

 		data = skb_put(rx->ax_skb, rx->size);
 		memcpy(data, skb->data + offset, rx->size);
 		if (!remaining)
 			usbnet_skb_return(dev, rx->ax_skb);

 		offset += (rx->size + 1) & 0xfffe;
 		rx->size = remaining;
 	}

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

 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;

 	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;
 	skb_push(skb, 4);
 	cpu_to_le32s(&packet_len);
 	skb_copy_to_linear_data(skb, &packet_len, sizeof(packet_len));

 	if (padlen) {
 		cpu_to_le32s(&padbytes);
 		memcpy(skb_tail_pointer(skb), &padbytes, sizeof(padbytes));
 		skb_put(skb, sizeof(padbytes));
 	}
 	return skb;
 }

 int asix_set_sw_mii(struct usbnet *dev)
 {
 	int ret;
 	ret = asix_write_cmd(dev, AX_CMD_SET_SW_MII, 0x0000, 0, 0, NULL);
 	if (ret < 0)
 		netdev_err(dev->net, "Failed to enable software MII access\n");
 	return ret;
 }

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

 int asix_read_phy_addr(struct usbnet *dev, int internal)
 {
 	int offset = (internal ? 1 : 0);
 	u8 buf[2];
 	int ret = asix_read_cmd(dev, AX_CMD_READ_PHY_ID, 0, 0, 2, buf);

 	netdev_dbg(dev->net, "asix_get_phy_addr()\n");

 	if (ret < 0) {
 		netdev_err(dev->net, "Error reading PHYID register: %02x\n", ret);
 		goto out;
 	}
 	netdev_dbg(dev->net, "asix_get_phy_addr() returning 0x%04x\n",
 		   *((__le16 *)buf));
 	ret = buf[offset];

 out:
 	return ret;
 }

 int asix_get_phy_addr(struct usbnet *dev)
 {
 	/* return the address of the internal phy */
 	return asix_read_phy_addr(dev, 1);
 }


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

         ret = asix_write_cmd(dev, AX_CMD_SW_RESET, flags, 0, 0, NULL);
 	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)
 {
 	__le16 v;
 	int ret = asix_read_cmd(dev, AX_CMD_READ_RX_CTL, 0, 0, 2, &v);

 	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 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);
 	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)
 {
 	__le16 v;
 	int ret = asix_read_cmd(dev, AX_CMD_READ_MEDIUM_STATUS, 0, 0, 2, &v);

 	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 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);
 	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 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);
 	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);
 }

 int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
 {
 	struct usbnet *dev = netdev_priv(netdev);
 	__le16 res;

 	mutex_lock(&dev->phy_mutex);
 	asix_set_sw_mii(dev);
 	asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
 				(__u16)loc, 2, &res);
 	asix_set_hw_mii(dev);
 	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 le16_to_cpu(res);
 }

 void asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val)
 {
 	struct usbnet *dev = netdev_priv(netdev);
 	__le16 res = cpu_to_le16(val);

 	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);
 	asix_set_sw_mii(dev);
 	asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id, (__u16)loc, 2, &res);
 	asix_set_hw_mii(dev);
 	mutex_unlock(&dev->phy_mutex);
 }

 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) {
 		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)
 		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)
 		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(sizeof(u16) * (last_word - first_word + 1),
 			      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) {
 			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(sizeof(u16) * (last_word - first_word + 1),
 			      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]));
 		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]));
 		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);
 	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);
 		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);
 	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);
 	strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
 	strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
 	info->eedump_len = AX_EEPROM_LEN;
 }

 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;

 	memcpy(net->dev_addr, addr->sa_data, ETH_ALEN);

 	/* 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;
 }
	/*
	* 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.
	*
	* 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 "asix.h"

	int asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
	u16 size, void *data)
	{
	int ret;
	ret = usbnet_read_cmd(dev, cmd,
	USB_DIR_IN \| USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
	value, index, data, size);

	if (ret != size && ret >= 0)
	return -EINVAL;
	return ret;
	}

	int asix_write_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
	u16 size, void *data)
	{
	return usbnet_write_cmd(dev, cmd,
	USB_DIR_OUT \| USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
	value, index, data, size);
	}

	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);
	}

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

	while (offset + sizeof(u16) <= skb->len) {
	u16 remaining = 0;
	unsigned char *data;

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

	/* get the packet length */
	rx->size = (u16) (rx->header & 0x7ff);
	if (rx->size != ((~rx->header >> 16) & 0x7ff)) {
	netdev_err(dev->net, "asix_rx_fixup() Bad Header Length 0x%x, offset %d\n",
	rx->header, offset);
	rx->size = 0;
	return 0;
	}
	rx->ax_skb = netdev_alloc_skb_ip_align(dev->net,
	rx->size);
	if (!rx->ax_skb)
	return 0;
	}

	if (rx->size > dev->net->mtu + ETH_HLEN + VLAN_HLEN) {
	netdev_err(dev->net, "asix_rx_fixup() Bad RX Length %d\n",
	rx->size);
	kfree_skb(rx->ax_skb);
	return 0;
	}

	if (rx->size > skb->len - offset) {
	remaining = rx->size - (skb->len - offset);
	rx->size = skb->len - offset;
	}

	data = skb_put(rx->ax_skb, rx->size);
	memcpy(data, skb->data + offset, rx->size);
	if (!remaining)
	usbnet_skb_return(dev, rx->ax_skb);

	offset += (rx->size + 1) & 0xfffe;
	rx->size = remaining;
	}

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

	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;

	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;
	skb_push(skb, 4);
	cpu_to_le32s(&packet_len);
	skb_copy_to_linear_data(skb, &packet_len, sizeof(packet_len));

	if (padlen) {
	cpu_to_le32s(&padbytes);
	memcpy(skb_tail_pointer(skb), &padbytes, sizeof(padbytes));
	skb_put(skb, sizeof(padbytes));
	}
	return skb;
	}

	int asix_set_sw_mii(struct usbnet *dev)
	{
	int ret;
	ret = asix_write_cmd(dev, AX_CMD_SET_SW_MII, 0x0000, 0, 0, NULL);
	if (ret < 0)
	netdev_err(dev->net, "Failed to enable software MII access\n");
	return ret;
	}

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

	int asix_read_phy_addr(struct usbnet *dev, int internal)
	{
	int offset = (internal ? 1 : 0);
	u8 buf[2];
	int ret = asix_read_cmd(dev, AX_CMD_READ_PHY_ID, 0, 0, 2, buf);

	netdev_dbg(dev->net, "asix_get_phy_addr()\n");

	if (ret < 0) {
	netdev_err(dev->net, "Error reading PHYID register: %02x\n", ret);
	goto out;
	}
	netdev_dbg(dev->net, "asix_get_phy_addr() returning 0x%04x\n",
	((__le16 )buf));
	ret = buf[offset];

	out:
	return ret;
	}

	int asix_get_phy_addr(struct usbnet *dev)
	{
	/* return the address of the internal phy */
	return asix_read_phy_addr(dev, 1);
	}


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

	ret = asix_write_cmd(dev, AX_CMD_SW_RESET, flags, 0, 0, NULL);
	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)
	{
	__le16 v;
	int ret = asix_read_cmd(dev, AX_CMD_READ_RX_CTL, 0, 0, 2, &v);

	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 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);
	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)
	{
	__le16 v;
	int ret = asix_read_cmd(dev, AX_CMD_READ_MEDIUM_STATUS, 0, 0, 2, &v);

	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 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);
	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 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);
	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);
	}

	int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
	{
	struct usbnet *dev = netdev_priv(netdev);
	__le16 res;

	mutex_lock(&dev->phy_mutex);
	asix_set_sw_mii(dev);
	asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
	(__u16)loc, 2, &res);
	asix_set_hw_mii(dev);
	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 le16_to_cpu(res);
	}

	void asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val)
	{
	struct usbnet *dev = netdev_priv(netdev);
	__le16 res = cpu_to_le16(val);

	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);
	asix_set_sw_mii(dev);
	asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id, (__u16)loc, 2, &res);
	asix_set_hw_mii(dev);
	mutex_unlock(&dev->phy_mutex);
	}

	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) {
	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)
	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)
	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(sizeof(u16) * (last_word - first_word + 1),
	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) {
	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(sizeof(u16) * (last_word - first_word + 1),
	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]));
	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]));
	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);
	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);
	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);
	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);
	strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
	strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
	info->eedump_len = AX_EEPROM_LEN;
	}

	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;

	memcpy(net->dev_addr, addr->sa_data, ETH_ALEN);

	/* 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;
	}