
/*
 * Linux device driver for USB based Prism54
 *
 * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
 *
 * Based on the islsm (softmac prism54) driver, which is:
 * Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/usb.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/firmware.h>
#include <linux/etherdevice.h>
#include <linux/delay.h>
#include <linux/crc32.h>
#include <linux/module.h>
#include <net/mac80211.h>

#include "p54.h"
#include "lmac.h"
#include "p54usb.h"

MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>");
MODULE_DESCRIPTION("Prism54 USB wireless driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("prism54usb");
MODULE_FIRMWARE("isl3886usb");
MODULE_FIRMWARE("isl3887usb");

/*
 * Note:
 *
 * Always update our wiki's device list (located at:
 * http://wireless.kernel.org/en/users/Drivers/p54/devices ),
 * whenever you add a new device.
 */

static struct usb_device_id p54u_table[] __devinitdata = {
	/* Version 1 devices (pci chip + net2280) */
	{USB_DEVICE(0x0411, 0x0050)},	/* Buffalo WLI2-USB2-G54 */
	{USB_DEVICE(0x045e, 0x00c2)},	/* Microsoft MN-710 */
	{USB_DEVICE(0x0506, 0x0a11)},	/* 3COM 3CRWE254G72 */
	{USB_DEVICE(0x06b9, 0x0120)},	/* Thomson SpeedTouch 120g */
	{USB_DEVICE(0x0707, 0xee06)},	/* SMC 2862W-G */
	{USB_DEVICE(0x07aa, 0x001c)},	/* Corega CG-WLUSB2GT */
	{USB_DEVICE(0x083a, 0x4501)},	/* Accton 802.11g WN4501 USB */
	{USB_DEVICE(0x083a, 0x4502)},	/* Siemens Gigaset USB Adapter */
	{USB_DEVICE(0x083a, 0x5501)},	/* Phillips CPWUA054 */
	{USB_DEVICE(0x0846, 0x4200)},	/* Netgear WG121 */
	{USB_DEVICE(0x0846, 0x4210)},	/* Netgear WG121 the second ? */
	{USB_DEVICE(0x0846, 0x4220)},	/* Netgear WG111 */
	{USB_DEVICE(0x09aa, 0x1000)},	/* Spinnaker Proto board */
	{USB_DEVICE(0x0bf8, 0x1007)},	/* Fujitsu E-5400 USB */
	{USB_DEVICE(0x0cde, 0x0006)},	/* Medion 40900, Roper Europe */
	{USB_DEVICE(0x0db0, 0x6826)},	/* MSI UB54G (MS-6826) */
	{USB_DEVICE(0x107b, 0x55f2)},	/* Gateway WGU-210 (Gemtek) */
	{USB_DEVICE(0x124a, 0x4023)},	/* Shuttle PN15, Airvast WM168g, IOGear GWU513 */
	{USB_DEVICE(0x1435, 0x0210)},	/* Inventel UR054G */
	{USB_DEVICE(0x15a9, 0x0002)},	/* Gemtek WUBI-100GW 802.11g */
	{USB_DEVICE(0x1630, 0x0005)},	/* 2Wire 802.11g USB (v1) / Z-Com */
	{USB_DEVICE(0x182d, 0x096b)},	/* Sitecom WL-107 */
	{USB_DEVICE(0x1915, 0x2234)},	/* Linksys WUSB54G OEM */
	{USB_DEVICE(0x1915, 0x2235)},	/* Linksys WUSB54G Portable OEM */
	{USB_DEVICE(0x2001, 0x3701)},	/* DLink DWL-G120 Spinnaker */
	{USB_DEVICE(0x2001, 0x3703)},	/* DLink DWL-G122 */
	{USB_DEVICE(0x2001, 0x3762)},	/* Conceptronic C54U */
	{USB_DEVICE(0x5041, 0x2234)},	/* Linksys WUSB54G */
	{USB_DEVICE(0x5041, 0x2235)},	/* Linksys WUSB54G Portable */

	/* Version 2 devices (3887) */
	{USB_DEVICE(0x0471, 0x1230)},   /* Philips CPWUA054/00 */
	{USB_DEVICE(0x050d, 0x7050)},	/* Belkin F5D7050 ver 1000 */
	{USB_DEVICE(0x0572, 0x2000)},	/* Cohiba Proto board */
	{USB_DEVICE(0x0572, 0x2002)},	/* Cohiba Proto board */
	{USB_DEVICE(0x06a9, 0x000e)},	/* Westell 802.11g USB (A90-211WG-01) */
	{USB_DEVICE(0x06b9, 0x0121)},	/* Thomson SpeedTouch 121g */
	{USB_DEVICE(0x0707, 0xee13)},   /* SMC 2862W-G version 2 */
	{USB_DEVICE(0x083a, 0x4521)},   /* Siemens Gigaset USB Adapter 54 version 2 */
	{USB_DEVICE(0x083a, 0xc501)},	/* Zoom Wireless-G 4410 */
	{USB_DEVICE(0x083a, 0xf503)},	/* Accton FD7050E ver 1010ec  */
	{USB_DEVICE(0x0846, 0x4240)},	/* Netgear WG111 (v2) */
	{USB_DEVICE(0x0915, 0x2000)},	/* Cohiba Proto board */
	{USB_DEVICE(0x0915, 0x2002)},	/* Cohiba Proto board */
	{USB_DEVICE(0x0baf, 0x0118)},   /* U.S. Robotics U5 802.11g Adapter*/
	{USB_DEVICE(0x0bf8, 0x1009)},   /* FUJITSU E-5400 USB D1700*/
	/* {USB_DEVICE(0x0cde, 0x0006)}, * Medion MD40900 already listed above,
					 * just noting it here for clarity */
	{USB_DEVICE(0x0cde, 0x0008)},	/* Sagem XG703A */
	{USB_DEVICE(0x0cde, 0x0015)},	/* Zcomax XG-705A */
	{USB_DEVICE(0x0d8e, 0x3762)},	/* DLink DWL-G120 Cohiba */
	{USB_DEVICE(0x124a, 0x4025)},	/* IOGear GWU513 (GW3887IK chip) */
	{USB_DEVICE(0x1260, 0xee22)},	/* SMC 2862W-G version 2 */
	{USB_DEVICE(0x13b1, 0x000a)},	/* Linksys WUSB54G ver 2 */
	{USB_DEVICE(0x13B1, 0x000C)},	/* Linksys WUSB54AG */
	{USB_DEVICE(0x1413, 0x5400)},   /* Telsey 802.11g USB2.0 Adapter */
	{USB_DEVICE(0x1435, 0x0427)},	/* Inventel UR054G */
	{USB_DEVICE(0x1668, 0x1050)},	/* Actiontec 802UIG-1 */
	{USB_DEVICE(0x1740, 0x1000)},	/* Senao NUB-350 */
	{USB_DEVICE(0x2001, 0x3704)},	/* DLink DWL-G122 rev A2 */
	{USB_DEVICE(0x2001, 0x3705)},	/* D-Link DWL-G120 rev C1 */
	{USB_DEVICE(0x413c, 0x5513)},	/* Dell WLA3310 USB Wireless Adapter */
	{USB_DEVICE(0x413c, 0x8102)},	/* Spinnaker DUT */
	{USB_DEVICE(0x413c, 0x8104)},	/* Cohiba Proto board */
	{}
};

MODULE_DEVICE_TABLE(usb, p54u_table);

static const struct {
	u32 intf;
	enum p54u_hw_type type;
	const char *fw;
	const char *fw_legacy;
	char hw[20];
} p54u_fwlist[__NUM_P54U_HWTYPES] = {
	{
		.type = P54U_NET2280,
		.intf = FW_LM86,
		.fw = "isl3886usb",
		.fw_legacy = "isl3890usb",
		.hw = "ISL3886 + net2280",
	},
	{
		.type = P54U_3887,
		.intf = FW_LM87,
		.fw = "isl3887usb",
		.fw_legacy = "isl3887usb_bare",
		.hw = "ISL3887",
	},
};

static void p54u_rx_cb(struct urb *urb)
{
	struct sk_buff *skb = (struct sk_buff *) urb->context;
	struct p54u_rx_info *info = (struct p54u_rx_info *)skb->cb;
	struct ieee80211_hw *dev = info->dev;
	struct p54u_priv *priv = dev->priv;

	skb_unlink(skb, &priv->rx_queue);

	if (unlikely(urb->status)) {
		dev_kfree_skb_irq(skb);
		return;
	}

	skb_put(skb, urb->actual_length);

	if (priv->hw_type == P54U_NET2280)
		skb_pull(skb, priv->common.tx_hdr_len);
	if (priv->common.fw_interface == FW_LM87) {
		skb_pull(skb, 4);
		skb_put(skb, 4);
	}

	if (p54_rx(dev, skb)) {
		skb = dev_alloc_skb(priv->common.rx_mtu + 32);
		if (unlikely(!skb)) {
			/* TODO check rx queue length and refill *somewhere* */
			return;
		}

		info = (struct p54u_rx_info *) skb->cb;
		info->urb = urb;
		info->dev = dev;
		urb->transfer_buffer = skb_tail_pointer(skb);
		urb->context = skb;
	} else {
		if (priv->hw_type == P54U_NET2280)
			skb_push(skb, priv->common.tx_hdr_len);
		if (priv->common.fw_interface == FW_LM87) {
			skb_push(skb, 4);
			skb_put(skb, 4);
		}
		skb_reset_tail_pointer(skb);
		skb_trim(skb, 0);
		urb->transfer_buffer = skb_tail_pointer(skb);
	}
	skb_queue_tail(&priv->rx_queue, skb);
	usb_anchor_urb(urb, &priv->submitted);
	if (usb_submit_urb(urb, GFP_ATOMIC)) {
		skb_unlink(skb, &priv->rx_queue);
		usb_unanchor_urb(urb);
		dev_kfree_skb_irq(skb);
	}
}

static void p54u_tx_cb(struct urb *urb)
{
	struct sk_buff *skb = urb->context;
	struct ieee80211_hw *dev =
		usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));

	p54_free_skb(dev, skb);
}

static void p54u_tx_dummy_cb(struct urb *urb) { }

static void p54u_free_urbs(struct ieee80211_hw *dev)
{
	struct p54u_priv *priv = dev->priv;
	usb_kill_anchored_urbs(&priv->submitted);
}

static int p54u_init_urbs(struct ieee80211_hw *dev)
{
	struct p54u_priv *priv = dev->priv;
	struct urb *entry = NULL;
	struct sk_buff *skb;
	struct p54u_rx_info *info;
	int ret = 0;

	while (skb_queue_len(&priv->rx_queue) < 32) {
		skb = __dev_alloc_skb(priv->common.rx_mtu + 32, GFP_KERNEL);
		if (!skb) {
			ret = -ENOMEM;
			goto err;
		}
		entry = usb_alloc_urb(0, GFP_KERNEL);
		if (!entry) {
			ret = -ENOMEM;
			goto err;
		}

		usb_fill_bulk_urb(entry, priv->udev,
				  usb_rcvbulkpipe(priv->udev, P54U_PIPE_DATA),
				  skb_tail_pointer(skb),
				  priv->common.rx_mtu + 32, p54u_rx_cb, skb);
		info = (struct p54u_rx_info *) skb->cb;
		info->urb = entry;
		info->dev = dev;
		skb_queue_tail(&priv->rx_queue, skb);

		usb_anchor_urb(entry, &priv->submitted);
		ret = usb_submit_urb(entry, GFP_KERNEL);
		if (ret) {
			skb_unlink(skb, &priv->rx_queue);
			usb_unanchor_urb(entry);
			goto err;
		}
		usb_free_urb(entry);
		entry = NULL;
	}

	return 0;

 err:
	usb_free_urb(entry);
	kfree_skb(skb);
	p54u_free_urbs(dev);
	return ret;
}

static __le32 p54u_lm87_chksum(const __le32 *data, size_t length)
{
	u32 chk = 0;

	length >>= 2;
	while (length--) {
		chk ^= le32_to_cpu(*data++);
		chk = (chk >> 5) ^ (chk << 3);
	}

	return cpu_to_le32(chk);
}

static void p54u_tx_lm87(struct ieee80211_hw *dev, struct sk_buff *skb)
{
	struct p54u_priv *priv = dev->priv;
	struct urb *data_urb;
	struct lm87_tx_hdr *hdr = (void *)skb->data - sizeof(*hdr);

	data_urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!data_urb) {
		p54_free_skb(dev, skb);
		return;
	}

	hdr->chksum = p54u_lm87_chksum((__le32 *)skb->data, skb->len);
	hdr->device_addr = ((struct p54_hdr *)skb->data)->req_id;

	usb_fill_bulk_urb(data_urb, priv->udev,
			  usb_sndbulkpipe(priv->udev, P54U_PIPE_DATA),
			  hdr, skb->len + sizeof(*hdr),  FREE_AFTER_TX(skb) ?
			  p54u_tx_cb : p54u_tx_dummy_cb, skb);
	data_urb->transfer_flags |= URB_ZERO_PACKET;

	usb_anchor_urb(data_urb, &priv->submitted);
	if (usb_submit_urb(data_urb, GFP_ATOMIC)) {
		usb_unanchor_urb(data_urb);
		p54_free_skb(dev, skb);
	}
	usb_free_urb(data_urb);
}

static void p54u_tx_net2280(struct ieee80211_hw *dev, struct sk_buff *skb)
{
	struct p54u_priv *priv = dev->priv;
	struct urb *int_urb = NULL, *data_urb = NULL;
	struct net2280_tx_hdr *hdr = (void *)skb->data - sizeof(*hdr);
	struct net2280_reg_write *reg = NULL;
	int err = -ENOMEM;

	reg = kmalloc(sizeof(*reg), GFP_ATOMIC);
	if (!reg)
		goto out;

	int_urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!int_urb)
		goto out;

	data_urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!data_urb)
		goto out;

	reg->port = cpu_to_le16(NET2280_DEV_U32);
	reg->addr = cpu_to_le32(P54U_DEV_BASE);
	reg->val = cpu_to_le32(ISL38XX_DEV_INT_DATA);

	memset(hdr, 0, sizeof(*hdr));
	hdr->len = cpu_to_le16(skb->len);
	hdr->device_addr = ((struct p54_hdr *) skb->data)->req_id;

	usb_fill_bulk_urb(int_urb, priv->udev,
		usb_sndbulkpipe(priv->udev, P54U_PIPE_DEV), reg, sizeof(*reg),
		p54u_tx_dummy_cb, dev);

	/*
	 * URB_FREE_BUFFER triggers a code path in the USB subsystem that will
	 * free what is inside the transfer_buffer after the last reference to
	 * the int_urb is dropped.
	 */
	int_urb->transfer_flags |= URB_FREE_BUFFER | URB_ZERO_PACKET;
	reg = NULL;

	usb_fill_bulk_urb(data_urb, priv->udev,
			  usb_sndbulkpipe(priv->udev, P54U_PIPE_DATA),
			  hdr, skb->len + sizeof(*hdr), FREE_AFTER_TX(skb) ?
			  p54u_tx_cb : p54u_tx_dummy_cb, skb);
	data_urb->transfer_flags |= URB_ZERO_PACKET;

	usb_anchor_urb(int_urb, &priv->submitted);
	err = usb_submit_urb(int_urb, GFP_ATOMIC);
	if (err) {
		usb_unanchor_urb(int_urb);
		goto out;
	}

	usb_anchor_urb(data_urb, &priv->submitted);
	err = usb_submit_urb(data_urb, GFP_ATOMIC);
	if (err) {
		usb_unanchor_urb(data_urb);
		goto out;
	}
out:
	usb_free_urb(int_urb);
	usb_free_urb(data_urb);

	if (err) {
		kfree(reg);
		p54_free_skb(dev, skb);
	}
}

static int p54u_write(struct p54u_priv *priv,
		      struct net2280_reg_write *buf,
		      enum net2280_op_type type,
		      __le32 addr, __le32 val)
{
	unsigned int ep;
	int alen;

	if (type & 0x0800)
		ep = usb_sndbulkpipe(priv->udev, P54U_PIPE_DEV);
	else
		ep = usb_sndbulkpipe(priv->udev, P54U_PIPE_BRG);

	buf->port = cpu_to_le16(type);
	buf->addr = addr;
	buf->val = val;

	return usb_bulk_msg(priv->udev, ep, buf, sizeof(*buf), &alen, 1000);
}

static int p54u_read(struct p54u_priv *priv, void *buf,
		     enum net2280_op_type type,
		     __le32 addr, __le32 *val)
{
	struct net2280_reg_read *read = buf;
	__le32 *reg = buf;
	unsigned int ep;
	int alen, err;

	if (type & 0x0800)
		ep = P54U_PIPE_DEV;
	else
		ep = P54U_PIPE_BRG;

	read->port = cpu_to_le16(type);
	read->addr = addr;

	err = usb_bulk_msg(priv->udev, usb_sndbulkpipe(priv->udev, ep),
			   read, sizeof(*read), &alen, 1000);
	if (err)
		return err;

	err = usb_bulk_msg(priv->udev, usb_rcvbulkpipe(priv->udev, ep),
			   reg, sizeof(*reg), &alen, 1000);
	if (err)
		return err;

	*val = *reg;
	return 0;
}

static int p54u_bulk_msg(struct p54u_priv *priv, unsigned int ep,
			 void *data, size_t len)
{
	int alen;
	return usb_bulk_msg(priv->udev, usb_sndbulkpipe(priv->udev, ep),
			    data, len, &alen, 2000);
}

static int p54u_device_reset(struct ieee80211_hw *dev)
{
	struct p54u_priv *priv = dev->priv;
	int ret, lock = (priv->intf->condition != USB_INTERFACE_BINDING);

	if (lock) {
		ret = usb_lock_device_for_reset(priv->udev, priv->intf);
		if (ret < 0) {
			dev_err(&priv->udev->dev, "(p54usb) unable to lock "
				"device for reset (%d)!\n", ret);
			return ret;
		}
	}

	ret = usb_reset_device(priv->udev);
	if (lock)
		usb_unlock_device(priv->udev);

	if (ret)
		dev_err(&priv->udev->dev, "(p54usb) unable to reset "
			"device (%d)!\n", ret);

	return ret;
}

static const char p54u_romboot_3887[] = "~~~~";
static int p54u_firmware_reset_3887(struct ieee80211_hw *dev)
{
	struct p54u_priv *priv = dev->priv;
	u8 *buf;
	int ret;

	buf = kmemdup(p54u_romboot_3887, 4, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;
	ret = p54u_bulk_msg(priv, P54U_PIPE_DATA,
			    buf, 4);
	kfree(buf);
	if (ret)
		dev_err(&priv->udev->dev, "(p54usb) unable to jump to "
			"boot ROM (%d)!\n", ret);

	return ret;
}

static const char p54u_firmware_upload_3887[] = "<\r";
static int p54u_upload_firmware_3887(struct ieee80211_hw *dev)
{
	struct p54u_priv *priv = dev->priv;
	int err, alen;
	u8 carry = 0;
	u8 *buf, *tmp;
	const u8 *data;
	unsigned int left, remains, block_size;
	struct x2_header *hdr;
	unsigned long timeout;

	err = p54u_firmware_reset_3887(dev);
	if (err)
		return err;

	tmp = buf = kmalloc(P54U_FW_BLOCK, GFP_KERNEL);
	if (!buf) {
		dev_err(&priv->udev->dev, "(p54usb) cannot allocate firmware"
					  "upload buffer!\n");
		return -ENOMEM;
	}

	left = block_size = min((size_t)P54U_FW_BLOCK, priv->fw->size);
	strcpy(buf, p54u_firmware_upload_3887);
	left -= strlen(p54u_firmware_upload_3887);
	tmp += strlen(p54u_firmware_upload_3887);

	data = priv->fw->data;
	remains = priv->fw->size;

	hdr = (struct x2_header *)(buf + strlen(p54u_firmware_upload_3887));
	memcpy(hdr->signature, X2_SIGNATURE, X2_SIGNATURE_SIZE);
	hdr->fw_load_addr = cpu_to_le32(ISL38XX_DEV_FIRMWARE_ADDR);
	hdr->fw_length = cpu_to_le32(priv->fw->size);
	hdr->crc = cpu_to_le32(~crc32_le(~0, (void *)&hdr->fw_load_addr,
					 sizeof(u32)*2));
	left -= sizeof(*hdr);
	tmp += sizeof(*hdr);

	while (remains) {
		while (left--) {
			if (carry) {
				*tmp++ = carry;
				carry = 0;
				remains--;
				continue;
			}
			switch (*data) {
			case '~':
				*tmp++ = '}';
				carry = '^';
				break;
			case '}':
				*tmp++ = '}';
				carry = ']';
				break;
			default:
				*tmp++ = *data;
				remains--;
				break;
			}
			data++;
		}

		err = p54u_bulk_msg(priv, P54U_PIPE_DATA, buf, block_size);
		if (err) {
			dev_err(&priv->udev->dev, "(p54usb) firmware "
						  "upload failed!\n");
			goto err_upload_failed;
		}

		tmp = buf;
		left = block_size = min((unsigned int)P54U_FW_BLOCK, remains);
	}

	*((__le32 *)buf) = cpu_to_le32(~crc32_le(~0, priv->fw->data,
						 priv->fw->size));
	err = p54u_bulk_msg(priv, P54U_PIPE_DATA, buf, sizeof(u32));
	if (err) {
		dev_err(&priv->udev->dev, "(p54usb) firmware upload failed!\n");
		goto err_upload_failed;
	}
	timeout = jiffies + msecs_to_jiffies(1000);
	while (!(err = usb_bulk_msg(priv->udev,
		usb_rcvbulkpipe(priv->udev, P54U_PIPE_DATA), buf, 128, &alen, 1000))) {
		if (alen > 2 && !memcmp(buf, "OK", 2))
			break;

		if (alen > 5 && !memcmp(buf, "ERROR", 5)) {
			err = -EINVAL;
			break;
		}

		if (time_after(jiffies, timeout)) {
			dev_err(&priv->udev->dev, "(p54usb) firmware boot "
						  "timed out!\n");
			err = -ETIMEDOUT;
			break;
		}
	}
	if (err) {
		dev_err(&priv->udev->dev, "(p54usb) firmware upload failed!\n");
		goto err_upload_failed;
	}

	buf[0] = 'g';
	buf[1] = '\r';
	err = p54u_bulk_msg(priv, P54U_PIPE_DATA, buf, 2);
	if (err) {
		dev_err(&priv->udev->dev, "(p54usb) firmware boot failed!\n");
		goto err_upload_failed;
	}

	timeout = jiffies + msecs_to_jiffies(1000);
	while (!(err = usb_bulk_msg(priv->udev,
		usb_rcvbulkpipe(priv->udev, P54U_PIPE_DATA), buf, 128, &alen, 1000))) {
		if (alen > 0 && buf[0] == 'g')
			break;

		if (time_after(jiffies, timeout)) {
			err = -ETIMEDOUT;
			break;
		}
	}
	if (err)
		goto err_upload_failed;

err_upload_failed:
	kfree(buf);
	return err;
}

static int p54u_upload_firmware_net2280(struct ieee80211_hw *dev)
{
	struct p54u_priv *priv = dev->priv;
	const struct p54p_csr *devreg = (const struct p54p_csr *) P54U_DEV_BASE;
	int err, alen;
	void *buf;
	__le32 reg;
	unsigned int remains, offset;
	const u8 *data;

	buf = kmalloc(512, GFP_KERNEL);
	if (!buf) {
		dev_err(&priv->udev->dev, "(p54usb) firmware buffer "
					  "alloc failed!\n");
		return -ENOMEM;
	}

#define P54U_WRITE(type, addr, data) \
	do {\
		err = p54u_write(priv, buf, type,\
				 cpu_to_le32((u32)(unsigned long)addr), data);\
		if (err) \
			goto fail;\
	} while (0)

#define P54U_READ(type, addr) \
	do {\
		err = p54u_read(priv, buf, type,\
				cpu_to_le32((u32)(unsigned long)addr), &reg);\
		if (err)\
			goto fail;\
	} while (0)

	/* power down net2280 bridge */
	P54U_READ(NET2280_BRG_U32, NET2280_GPIOCTL);
	reg |= cpu_to_le32(P54U_BRG_POWER_DOWN);
	reg &= cpu_to_le32(~P54U_BRG_POWER_UP);
	P54U_WRITE(NET2280_BRG_U32, NET2280_GPIOCTL, reg);

	mdelay(100);

	/* power up bridge */
	reg |= cpu_to_le32(P54U_BRG_POWER_UP);
	reg &= cpu_to_le32(~P54U_BRG_POWER_DOWN);
	P54U_WRITE(NET2280_BRG_U32, NET2280_GPIOCTL, reg);

	mdelay(100);

	P54U_WRITE(NET2280_BRG_U32, NET2280_DEVINIT,
		   cpu_to_le32(NET2280_CLK_30Mhz |
			       NET2280_PCI_ENABLE |
			       NET2280_PCI_SOFT_RESET));

	mdelay(20);

	P54U_WRITE(NET2280_BRG_CFG_U16, PCI_COMMAND,
		   cpu_to_le32(PCI_COMMAND_MEMORY |
			       PCI_COMMAND_MASTER));

	P54U_WRITE(NET2280_BRG_CFG_U32, PCI_BASE_ADDRESS_0,
		   cpu_to_le32(NET2280_BASE));

	P54U_READ(NET2280_BRG_CFG_U16, PCI_STATUS);
	reg |= cpu_to_le32(PCI_STATUS_REC_MASTER_ABORT);
	P54U_WRITE(NET2280_BRG_CFG_U16, PCI_STATUS, reg);

	// TODO: we really need this?
	P54U_READ(NET2280_BRG_U32, NET2280_RELNUM);

	P54U_WRITE(NET2280_BRG_U32, NET2280_EPA_RSP,
		   cpu_to_le32(NET2280_CLEAR_NAK_OUT_PACKETS_MODE));
	P54U_WRITE(NET2280_BRG_U32, NET2280_EPC_RSP,
		   cpu_to_le32(NET2280_CLEAR_NAK_OUT_PACKETS_MODE));

	P54U_WRITE(NET2280_BRG_CFG_U32, PCI_BASE_ADDRESS_2,
		   cpu_to_le32(NET2280_BASE2));

	/* finally done setting up the bridge */

	P54U_WRITE(NET2280_DEV_CFG_U16, 0x10000 | PCI_COMMAND,
		   cpu_to_le32(PCI_COMMAND_MEMORY |
			       PCI_COMMAND_MASTER));

	P54U_WRITE(NET2280_DEV_CFG_U16, 0x10000 | 0x40 /* TRDY timeout */, 0);
	P54U_WRITE(NET2280_DEV_CFG_U32, 0x10000 | PCI_BASE_ADDRESS_0,
		   cpu_to_le32(P54U_DEV_BASE));

	P54U_WRITE(NET2280_BRG_U32, NET2280_USBIRQENB1, 0);
	P54U_WRITE(NET2280_BRG_U32, NET2280_IRQSTAT1,
		   cpu_to_le32(NET2280_PCI_INTA_INTERRUPT));

	/* do romboot */
	P54U_WRITE(NET2280_DEV_U32, &devreg->int_enable, 0);

	P54U_READ(NET2280_DEV_U32, &devreg->ctrl_stat);
	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RESET);
	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RAMBOOT);
	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_CLKRUN);
	P54U_WRITE(NET2280_DEV_U32, &devreg->ctrl_stat, reg);

	mdelay(20);

	reg |= cpu_to_le32(ISL38XX_CTRL_STAT_RESET);
	P54U_WRITE(NET2280_DEV_U32, &devreg->ctrl_stat, reg);

	mdelay(20);

	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RESET);
	P54U_WRITE(NET2280_DEV_U32, &devreg->ctrl_stat, reg);

	mdelay(100);

	P54U_READ(NET2280_DEV_U32, &devreg->int_ident);
	P54U_WRITE(NET2280_DEV_U32, &devreg->int_ack, reg);

	/* finally, we can upload firmware now! */
	remains = priv->fw->size;
	data = priv->fw->data;
	offset = ISL38XX_DEV_FIRMWARE_ADDR;

	while (remains) {
		unsigned int block_len = min(remains, (unsigned int)512);
		memcpy(buf, data, block_len);

		err = p54u_bulk_msg(priv, P54U_PIPE_DATA, buf, block_len);
		if (err) {
			dev_err(&priv->udev->dev, "(p54usb) firmware block "
						  "upload failed\n");
			goto fail;
		}

		P54U_WRITE(NET2280_DEV_U32, &devreg->direct_mem_base,
			   cpu_to_le32(0xc0000f00));

		P54U_WRITE(NET2280_DEV_U32,
			   0x0020 | (unsigned long)&devreg->direct_mem_win, 0);
		P54U_WRITE(NET2280_DEV_U32,
			   0x0020 | (unsigned long)&devreg->direct_mem_win,
			   cpu_to_le32(1));

		P54U_WRITE(NET2280_DEV_U32,
			   0x0024 | (unsigned long)&devreg->direct_mem_win,
			   cpu_to_le32(block_len));
		P54U_WRITE(NET2280_DEV_U32,
			   0x0028 | (unsigned long)&devreg->direct_mem_win,
			   cpu_to_le32(offset));

		P54U_WRITE(NET2280_DEV_U32, &devreg->dma_addr,
			   cpu_to_le32(NET2280_EPA_FIFO_PCI_ADDR));
		P54U_WRITE(NET2280_DEV_U32, &devreg->dma_len,
			   cpu_to_le32(block_len >> 2));
		P54U_WRITE(NET2280_DEV_U32, &devreg->dma_ctrl,
			   cpu_to_le32(ISL38XX_DMA_MASTER_CONTROL_TRIGGER));

		mdelay(10);

		P54U_READ(NET2280_DEV_U32,
			  0x002C | (unsigned long)&devreg->direct_mem_win);
		if (!(reg & cpu_to_le32(ISL38XX_DMA_STATUS_DONE)) ||
		    !(reg & cpu_to_le32(ISL38XX_DMA_STATUS_READY))) {
			dev_err(&priv->udev->dev, "(p54usb) firmware DMA "
						  "transfer failed\n");
			goto fail;
		}

		P54U_WRITE(NET2280_BRG_U32, NET2280_EPA_STAT,
			   cpu_to_le32(NET2280_FIFO_FLUSH));

		remains -= block_len;
		data += block_len;
		offset += block_len;
	}

	/* do ramboot */
	P54U_READ(NET2280_DEV_U32, &devreg->ctrl_stat);
	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RESET);
	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_CLKRUN);
	reg |= cpu_to_le32(ISL38XX_CTRL_STAT_RAMBOOT);
	P54U_WRITE(NET2280_DEV_U32, &devreg->ctrl_stat, reg);

	mdelay(20);

	reg |= cpu_to_le32(ISL38XX_CTRL_STAT_RESET);
	P54U_WRITE(NET2280_DEV_U32, &devreg->ctrl_stat, reg);

	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RESET);
	P54U_WRITE(NET2280_DEV_U32, &devreg->ctrl_stat, reg);

	mdelay(100);

	P54U_READ(NET2280_DEV_U32, &devreg->int_ident);
	P54U_WRITE(NET2280_DEV_U32, &devreg->int_ack, reg);

	/* start up the firmware */
	P54U_WRITE(NET2280_DEV_U32, &devreg->int_enable,
		   cpu_to_le32(ISL38XX_INT_IDENT_INIT));

	P54U_WRITE(NET2280_BRG_U32, NET2280_IRQSTAT1,
		   cpu_to_le32(NET2280_PCI_INTA_INTERRUPT));

	P54U_WRITE(NET2280_BRG_U32, NET2280_USBIRQENB1,
		   cpu_to_le32(NET2280_PCI_INTA_INTERRUPT_ENABLE |
			       NET2280_USB_INTERRUPT_ENABLE));

	P54U_WRITE(NET2280_DEV_U32, &devreg->dev_int,
		   cpu_to_le32(ISL38XX_DEV_INT_RESET));

	err = usb_interrupt_msg(priv->udev,
				usb_rcvbulkpipe(priv->udev, P54U_PIPE_INT),
				buf, sizeof(__le32), &alen, 1000);
	if (err || alen != sizeof(__le32))
		goto fail;

	P54U_READ(NET2280_DEV_U32, &devreg->int_ident);
	P54U_WRITE(NET2280_DEV_U32, &devreg->int_ack, reg);

	if (!(reg & cpu_to_le32(ISL38XX_INT_IDENT_INIT)))
		err = -EINVAL;

	P54U_WRITE(NET2280_BRG_U32, NET2280_USBIRQENB1, 0);
	P54U_WRITE(NET2280_BRG_U32, NET2280_IRQSTAT1,
		   cpu_to_le32(NET2280_PCI_INTA_INTERRUPT));

#undef P54U_WRITE
#undef P54U_READ

fail:
	kfree(buf);
	return err;
}

static int p54u_load_firmware(struct ieee80211_hw *dev)
{
	struct p54u_priv *priv = dev->priv;
	int err, i;

	BUILD_BUG_ON(ARRAY_SIZE(p54u_fwlist) != __NUM_P54U_HWTYPES);

	for (i = 0; i < __NUM_P54U_HWTYPES; i++)
		if (p54u_fwlist[i].type == priv->hw_type)
			break;

	if (i == __NUM_P54U_HWTYPES)
		return -EOPNOTSUPP;

	err = request_firmware(&priv->fw, p54u_fwlist[i].fw, &priv->udev->dev);
	if (err) {
		dev_err(&priv->udev->dev, "(p54usb) cannot load firmware %s "
					  "(%d)!\n", p54u_fwlist[i].fw, err);

		err = request_firmware(&priv->fw, p54u_fwlist[i].fw_legacy,
				       &priv->udev->dev);
		if (err)
			return err;
	}

	err = p54_parse_firmware(dev, priv->fw);
	if (err)
		goto out;

	if (priv->common.fw_interface != p54u_fwlist[i].intf) {
		dev_err(&priv->udev->dev, "wrong firmware, please get "
			"a firmware for \"%s\" and try again.\n",
			p54u_fwlist[i].hw);
		err = -EINVAL;
	}

out:
	if (err)
		release_firmware(priv->fw);

	return err;
}

static int p54u_open(struct ieee80211_hw *dev)
{
	struct p54u_priv *priv = dev->priv;
	int err;

	err = p54u_init_urbs(dev);
	if (err) {
		return err;
	}

	priv->common.open = p54u_init_urbs;

	return 0;
}

static void p54u_stop(struct ieee80211_hw *dev)
{
	/* TODO: figure out how to reliably stop the 3887 and net2280 so
	   the hardware is still usable next time we want to start it.
	   until then, we just stop listening to the hardware.. */
	p54u_free_urbs(dev);
}

static int __devinit p54u_probe(struct usb_interface *intf,
				const struct usb_device_id *id)
{
	struct usb_device *udev = interface_to_usbdev(intf);
	struct ieee80211_hw *dev;
	struct p54u_priv *priv;
	int err;
	unsigned int i, recognized_pipes;

	dev = p54_init_common(sizeof(*priv));

	if (!dev) {
		dev_err(&udev->dev, "(p54usb) ieee80211 alloc failed\n");
		return -ENOMEM;
	}

	priv = dev->priv;
	priv->hw_type = P54U_INVALID_HW;

	SET_IEEE80211_DEV(dev, &intf->dev);
	usb_set_intfdata(intf, dev);
	priv->udev = udev;
	priv->intf = intf;
	skb_queue_head_init(&priv->rx_queue);
	init_usb_anchor(&priv->submitted);

	usb_get_dev(udev);

	/* really lazy and simple way of figuring out if we're a 3887 */
	/* TODO: should just stick the identification in the device table */
	i = intf->altsetting->desc.bNumEndpoints;
	recognized_pipes = 0;
	while (i--) {
		switch (intf->altsetting->endpoint[i].desc.bEndpointAddress) {
		case P54U_PIPE_DATA:
		case P54U_PIPE_MGMT:
		case P54U_PIPE_BRG:
		case P54U_PIPE_DEV:
		case P54U_PIPE_DATA | USB_DIR_IN:
		case P54U_PIPE_MGMT | USB_DIR_IN:
		case P54U_PIPE_BRG | USB_DIR_IN:
		case P54U_PIPE_DEV | USB_DIR_IN:
		case P54U_PIPE_INT | USB_DIR_IN:
			recognized_pipes++;
		}
	}
	priv->common.open = p54u_open;
	priv->common.stop = p54u_stop;
	if (recognized_pipes < P54U_PIPE_NUMBER) {
#ifdef CONFIG_PM
		/* ISL3887 needs a full reset on resume */
		udev->reset_resume = 1;
#endif /* CONFIG_PM */
		err = p54u_device_reset(dev);

		priv->hw_type = P54U_3887;
		dev->extra_tx_headroom += sizeof(struct lm87_tx_hdr);
		priv->common.tx_hdr_len = sizeof(struct lm87_tx_hdr);
		priv->common.tx = p54u_tx_lm87;
		priv->upload_fw = p54u_upload_firmware_3887;
	} else {
		priv->hw_type = P54U_NET2280;
		dev->extra_tx_headroom += sizeof(struct net2280_tx_hdr);
		priv->common.tx_hdr_len = sizeof(struct net2280_tx_hdr);
		priv->common.tx = p54u_tx_net2280;
		priv->upload_fw = p54u_upload_firmware_net2280;
	}
	err = p54u_load_firmware(dev);
	if (err)
		goto err_free_dev;

	err = priv->upload_fw(dev);
	if (err)
		goto err_free_fw;

	p54u_open(dev);
	err = p54_read_eeprom(dev);
	p54u_stop(dev);
	if (err)
		goto err_free_fw;

	err = p54_register_common(dev, &udev->dev);
	if (err)
		goto err_free_fw;

	return 0;

err_free_fw:
	release_firmware(priv->fw);

err_free_dev:
	p54_free_common(dev);
	usb_set_intfdata(intf, NULL);
	usb_put_dev(udev);
	return err;
}

static void __devexit p54u_disconnect(struct usb_interface *intf)
{
	struct ieee80211_hw *dev = usb_get_intfdata(intf);
	struct p54u_priv *priv;

	if (!dev)
		return;

	p54_unregister_common(dev);

	priv = dev->priv;
	usb_put_dev(interface_to_usbdev(intf));
	release_firmware(priv->fw);
	p54_free_common(dev);
}

static int p54u_pre_reset(struct usb_interface *intf)
{
	struct ieee80211_hw *dev = usb_get_intfdata(intf);

	if (!dev)
		return -ENODEV;

	p54u_stop(dev);
	return 0;
}

static int p54u_resume(struct usb_interface *intf)
{
	struct ieee80211_hw *dev = usb_get_intfdata(intf);
	struct p54u_priv *priv;

	if (!dev)
		return -ENODEV;

	priv = dev->priv;
	if (unlikely(!(priv->upload_fw && priv->fw)))
		return 0;

	return priv->upload_fw(dev);
}

static int p54u_post_reset(struct usb_interface *intf)
{
	struct ieee80211_hw *dev = usb_get_intfdata(intf);
	struct p54u_priv *priv;
	int err;

	err = p54u_resume(intf);
	if (err)
		return err;

	/* reinitialize old device state */
	priv = dev->priv;
	if (priv->common.mode != NL80211_IFTYPE_UNSPECIFIED)
		ieee80211_restart_hw(dev);

	return 0;
}

#ifdef CONFIG_PM

static int p54u_suspend(struct usb_interface *intf, pm_message_t message)
{
	return p54u_pre_reset(intf);
}

#endif /* CONFIG_PM */

static struct usb_driver p54u_driver = {
	.name	= "p54usb",
	.id_table = p54u_table,
	.probe = p54u_probe,
	.disconnect = p54u_disconnect,
	.pre_reset = p54u_pre_reset,
	.post_reset = p54u_post_reset,
#ifdef CONFIG_PM
	.suspend = p54u_suspend,
	.resume = p54u_resume,
	.reset_resume = p54u_resume,
#endif /* CONFIG_PM */
	.soft_unbind = 1,
};

static int __init p54u_init(void)
{
	return usb_register(&p54u_driver);
}

static void __exit p54u_exit(void)
{
	usb_deregister(&p54u_driver);
}

module_init(p54u_init);
module_exit(p54u_exit);
