orinoco: add orinoco_usb driver

This driver uses the core orinoco modules for the bulk of
the functionality. The low level hermes routines (for local bus
cards) are replaced, the driver supplies its own ndo_xmit_start
function, and locking is done with the _bh variant.

Some recent functionality is not available to the USB cards yet
(firmware loading and WPA).

Out-of-tree driver originally written by Manuel Estrada Sainz.

Thanks to Mark Davis for supplying hardware to test the updates.

Signed-off-by: David Kilroy <kilroyd@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

6 files changed, 1696 insertions, 2 deletions

diff --git a/drivers/net/wireless/orinoco/Kconfig b/drivers/net/wireless/orinoco/Kconfig
index 6116b546861..60819bcf437 100644
--- a/drivers/net/wireless/orinoco/Kconfig
+++ b/drivers/net/wireless/orinoco/Kconfig
@@ -132,3 +132,10 @@ config PCMCIA_SPECTRUM
 	  This driver requires firmware download on startup.  Utilities
 	  for downloading Symbol firmware are available at
 	  <http://sourceforge.net/projects/orinoco/>
+
+config ORINOCO_USB
+	tristate "Agere Orinoco USB support"
+	depends on USB && HERMES
+	select FW_LOADER
+	---help---
+	  This driver is for USB versions of the Agere Orinoco card.
diff --git a/drivers/net/wireless/orinoco/Makefile b/drivers/net/wireless/orinoco/Makefile
index e6452698eba..bfdefb85abc 100644
--- a/drivers/net/wireless/orinoco/Makefile
+++ b/drivers/net/wireless/orinoco/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_PCI_HERMES)	+= orinoco_pci.o
 obj-$(CONFIG_TMD_HERMES)	+= orinoco_tmd.o
 obj-$(CONFIG_NORTEL_HERMES)	+= orinoco_nortel.o
 obj-$(CONFIG_PCMCIA_SPECTRUM)	+= spectrum_cs.o
+obj-$(CONFIG_ORINOCO_USB)	+= orinoco_usb.o
 
 # Orinoco should be endian clean.
 ccflags-y += -D__CHECK_ENDIAN__
diff --git a/drivers/net/wireless/orinoco/hermes.h b/drivers/net/wireless/orinoco/hermes.h
index 9e21ecdb4e7..aed14ff2d23 100644
--- a/drivers/net/wireless/orinoco/hermes.h
+++ b/drivers/net/wireless/orinoco/hermes.h
@@ -407,6 +407,7 @@ typedef struct hermes {
 #define HERMES_32BIT_REGSPACING	1
 	u16 inten; /* Which interrupts should be enabled? */
 	const struct hermes_ops *ops;
+	void *priv;
 } hermes_t;
 
 /* Register access convenience macros */
diff --git a/drivers/net/wireless/orinoco/main.c b/drivers/net/wireless/orinoco/main.c
index 36c4ba865c7..7c9faa4c079 100644
--- a/drivers/net/wireless/orinoco/main.c
+++ b/drivers/net/wireless/orinoco/main.c
@@ -797,7 +797,7 @@ static void orinoco_rx_monitor(struct net_device *dev, u16 rxfid,
 	stats->rx_dropped++;
 }
 
-static void __orinoco_ev_rx(struct net_device *dev, hermes_t *hw)
+void __orinoco_ev_rx(struct net_device *dev, hermes_t *hw)
 {
 	struct orinoco_private *priv = ndev_priv(dev);
 	struct net_device_stats *stats = &priv->stats;
@@ -918,6 +918,7 @@ update_stats:
 out:
 	kfree(desc);
 }
+EXPORT_SYMBOL(__orinoco_ev_rx);
 
 static void orinoco_rx(struct net_device *dev,
 		       struct hermes_rx_descriptor *desc,
@@ -1359,7 +1360,7 @@ static void orinoco_process_scan_results(struct work_struct *work)
 	spin_unlock_irqrestore(&priv->scan_lock, flags);
 }
 
-static void __orinoco_ev_info(struct net_device *dev, hermes_t *hw)
+void __orinoco_ev_info(struct net_device *dev, hermes_t *hw)
 {
 	struct orinoco_private *priv = ndev_priv(dev);
 	u16 infofid;
@@ -1577,6 +1578,7 @@ static void __orinoco_ev_info(struct net_device *dev, hermes_t *hw)
 
 	return;
 }
+EXPORT_SYMBOL(__orinoco_ev_info);
 
 static void __orinoco_ev_infdrop(struct net_device *dev, hermes_t *hw)
 {
diff --git a/drivers/net/wireless/orinoco/orinoco.h b/drivers/net/wireless/orinoco/orinoco.h
index 80a1386ce0b..e9f415a56d4 100644
--- a/drivers/net/wireless/orinoco/orinoco.h
+++ b/drivers/net/wireless/orinoco/orinoco.h
@@ -197,6 +197,9 @@ extern int orinoco_up(struct orinoco_private *priv);
 extern void orinoco_down(struct orinoco_private *priv);
 extern irqreturn_t orinoco_interrupt(int irq, void *dev_id);
 
+extern void __orinoco_ev_info(struct net_device *dev, hermes_t *hw);
+extern void __orinoco_ev_rx(struct net_device *dev, hermes_t *hw);
+
 /* Common ndo functions exported for reuse by orinoco_usb */
 int orinoco_open(struct net_device *dev);
 int orinoco_stop(struct net_device *dev);
diff --git a/drivers/net/wireless/orinoco/orinoco_usb.c b/drivers/net/wireless/orinoco/orinoco_usb.c
new file mode 100644
index 00000000000..ce0069de5c4
--- /dev/null
+++ b/drivers/net/wireless/orinoco/orinoco_usb.c
@@ -0,0 +1,1680 @@
+/*
+ * USB Orinoco driver
+ *
+ * Copyright (c) 2003 Manuel Estrada Sainz
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License
+ * at http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * Alternatively, the contents of this file may be used under the
+ * terms of the GNU General Public License version 2 (the "GPL"), in
+ * which case the provisions of the GPL are applicable instead of the
+ * above.  If you wish to allow the use of your version of this file
+ * only under the terms of the GPL and not to allow others to use your
+ * version of this file under the MPL, indicate your decision by
+ * deleting the provisions above and replace them with the notice and
+ * other provisions required by the GPL.  If you do not delete the
+ * provisions above, a recipient may use your version of this file
+ * under either the MPL or the GPL.
+ *
+ * Queueing code based on linux-wlan-ng 0.2.1-pre5
+ *
+ * Copyright (C) 1999 AbsoluteValue Systems, Inc.  All Rights Reserved.
+ *
+ *	The license is the same as above.
+ *
+ * Initialy based on USB Skeleton driver - 0.7
+ *
+ * Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com)
+ *
+ *	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.
+ *
+ * NOTE: The original USB Skeleton driver is GPL, but all that code is
+ * gone so MPL/GPL applies.
+ */
+
+#define DRIVER_NAME "orinoco_usb"
+#define PFX DRIVER_NAME ": "
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/errno.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/fcntl.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/smp_lock.h>
+#include <linux/usb.h>
+#include <linux/timer.h>
+
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/etherdevice.h>
+#include <linux/wireless.h>
+#include <linux/firmware.h>
+
+#include "orinoco.h"
+
+#ifndef URB_ASYNC_UNLINK
+#define URB_ASYNC_UNLINK 0
+#endif
+
+/* 802.2 LLC/SNAP header used for Ethernet encapsulation over 802.11 */
+static const u8 encaps_hdr[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
+#define ENCAPS_OVERHEAD		(sizeof(encaps_hdr) + 2)
+
+struct header_struct {
+	/* 802.3 */
+	u8 dest[ETH_ALEN];
+	u8 src[ETH_ALEN];
+	__be16 len;
+	/* 802.2 */
+	u8 dsap;
+	u8 ssap;
+	u8 ctrl;
+	/* SNAP */
+	u8 oui[3];
+	__be16 ethertype;
+} __attribute__ ((packed));
+
+struct ez_usb_fw {
+	u16 size;
+	const u8 *code;
+};
+
+static struct ez_usb_fw firmware = {
+	.size = 0,
+	.code = NULL,
+};
+
+#ifdef CONFIG_USB_DEBUG
+static int debug = 1;
+#else
+static int debug;
+#endif
+
+/* Debugging macros */
+#undef dbg
+#define dbg(format, arg...) \
+	do { if (debug) printk(KERN_DEBUG PFX "%s: " format "\n", \
+			       __func__ , ## arg); } while (0)
+#undef err
+#define err(format, arg...) \
+	do { printk(KERN_ERR PFX format "\n", ## arg); } while (0)
+
+/* Module paramaters */
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Debug enabled or not");
+
+MODULE_FIRMWARE("orinoco_ezusb_fw");
+
+/*
+ * Under some conditions, the card gets stuck and stops paying attention
+ * to the world (i.e. data communication stalls) until we do something to
+ * it.  Sending an INQ_TALLIES command seems to be enough and should be
+ * harmless otherwise.  This behaviour has been observed when using the
+ * driver on a systemimager client during installation.  In the past a
+ * timer was used to send INQ_TALLIES commands when there was no other
+ * activity, but it was troublesome and was removed.
+ */
+
+#define USB_COMPAQ_VENDOR_ID     0x049f /* Compaq Computer Corp. */
+#define USB_COMPAQ_WL215_ID      0x001f /* Compaq WL215 USB Adapter */
+#define USB_COMPAQ_W200_ID       0x0076 /* Compaq W200 USB Adapter */
+#define USB_HP_WL215_ID          0x0082 /* Compaq WL215 USB Adapter */
+
+#define USB_MELCO_VENDOR_ID      0x0411
+#define USB_BUFFALO_L11_ID       0x0006 /* BUFFALO WLI-USB-L11 */
+#define USB_BUFFALO_L11G_WR_ID   0x000B /* BUFFALO WLI-USB-L11G-WR */
+#define USB_BUFFALO_L11G_ID      0x000D /* BUFFALO WLI-USB-L11G */
+
+#define USB_LUCENT_VENDOR_ID     0x047E /* Lucent Technologies */
+#define USB_LUCENT_ORINOCO_ID    0x0300 /* Lucent/Agere Orinoco USB Client */
+
+#define USB_AVAYA8_VENDOR_ID     0x0D98
+#define USB_AVAYAE_VENDOR_ID     0x0D9E
+#define USB_AVAYA_WIRELESS_ID    0x0300 /* Avaya Wireless USB Card */
+
+#define USB_AGERE_VENDOR_ID      0x0D4E /* Agere Systems */
+#define USB_AGERE_MODEL0801_ID   0x1000 /* Wireless USB Card Model 0801 */
+#define USB_AGERE_MODEL0802_ID   0x1001 /* Wireless USB Card Model 0802 */
+#define USB_AGERE_REBRANDED_ID   0x047A /* WLAN USB Card */
+
+#define USB_ELSA_VENDOR_ID       0x05CC
+#define USB_ELSA_AIRLANCER_ID    0x3100 /* ELSA AirLancer USB-11 */
+
+#define USB_LEGEND_VENDOR_ID     0x0E7C
+#define USB_LEGEND_JOYNET_ID     0x0300 /* Joynet WLAN USB Card */
+
+#define USB_SAMSUNG_VENDOR_ID    0x04E8
+#define USB_SAMSUNG_SEW2001U1_ID 0x5002 /* Samsung SEW-2001u Card */
+#define USB_SAMSUNG_SEW2001U2_ID 0x5B11 /* Samsung SEW-2001u Card */
+#define USB_SAMSUNG_SEW2003U_ID  0x7011 /* Samsung SEW-2003U Card */
+
+#define USB_IGATE_VENDOR_ID      0x0681
+#define USB_IGATE_IGATE_11M_ID   0x0012 /* I-GATE 11M USB Card */
+
+#define USB_FUJITSU_VENDOR_ID    0x0BF8
+#define USB_FUJITSU_E1100_ID     0x1002 /* connect2AIR WLAN E-1100 USB */
+
+#define USB_2WIRE_VENDOR_ID      0x1630
+#define USB_2WIRE_WIRELESS_ID    0xff81 /* 2Wire Wireless USB adapter */
+
+
+#define EZUSB_REQUEST_FW_TRANS		0xA0
+#define EZUSB_REQUEST_TRIGER		0xAA
+#define EZUSB_REQUEST_TRIG_AC		0xAC
+#define EZUSB_CPUCS_REG			0x7F92
+
+#define EZUSB_RID_TX			0x0700
+#define EZUSB_RID_RX			0x0701
+#define EZUSB_RID_INIT1			0x0702
+#define EZUSB_RID_ACK			0x0710
+#define EZUSB_RID_DOCMD			0x0860
+
+/* Recognize info frames */
+#define EZUSB_IS_INFO(id)		((id >= 0xF000) && (id <= 0xF2FF))
+
+#define EZUSB_MAGIC			0x0210
+
+#define EZUSB_FRAME_DATA		1
+#define EZUSB_FRAME_CONTROL		2
+
+#define DEF_TIMEOUT			(3*HZ)
+
+#define BULK_BUF_SIZE			2048
+
+#define FW_BUF_SIZE			64
+#define FW_VAR_OFFSET_PTR		0x359
+#define FW_VAR_VALUE			0
+#define FW_HOLE_START			0x100
+#define FW_HOLE_END			0x300
+
+struct ezusb_packet {
+	__le16 magic;		/* 0x0210 */
+	u8 req_reply_count;
+	u8 ans_reply_count;
+	__le16 frame_type;	/* 0x01 for data frames, 0x02 otherwise */
+	__le16 size;		/* transport size */
+	__le16 crc;		/* CRC up to here */
+	__le16 hermes_len;
+	__le16 hermes_rid;
+	u8 data[0];
+} __attribute__ ((packed));
+
+/* Table of devices that work or may work with this driver */
+static struct usb_device_id ezusb_table[] = {
+	{USB_DEVICE(USB_COMPAQ_VENDOR_ID, USB_COMPAQ_WL215_ID)},
+	{USB_DEVICE(USB_COMPAQ_VENDOR_ID, USB_HP_WL215_ID)},
+	{USB_DEVICE(USB_COMPAQ_VENDOR_ID, USB_COMPAQ_W200_ID)},
+	{USB_DEVICE(USB_MELCO_VENDOR_ID, USB_BUFFALO_L11_ID)},
+	{USB_DEVICE(USB_MELCO_VENDOR_ID, USB_BUFFALO_L11G_WR_ID)},
+	{USB_DEVICE(USB_MELCO_VENDOR_ID, USB_BUFFALO_L11G_ID)},
+	{USB_DEVICE(USB_LUCENT_VENDOR_ID, USB_LUCENT_ORINOCO_ID)},
+	{USB_DEVICE(USB_AVAYA8_VENDOR_ID, USB_AVAYA_WIRELESS_ID)},
+	{USB_DEVICE(USB_AVAYAE_VENDOR_ID, USB_AVAYA_WIRELESS_ID)},
+	{USB_DEVICE(USB_AGERE_VENDOR_ID, USB_AGERE_MODEL0801_ID)},
+	{USB_DEVICE(USB_AGERE_VENDOR_ID, USB_AGERE_MODEL0802_ID)},
+	{USB_DEVICE(USB_ELSA_VENDOR_ID, USB_ELSA_AIRLANCER_ID)},
+	{USB_DEVICE(USB_LEGEND_VENDOR_ID, USB_LEGEND_JOYNET_ID)},
+	{USB_DEVICE_VER(USB_SAMSUNG_VENDOR_ID, USB_SAMSUNG_SEW2001U1_ID,
+			0, 0)},
+	{USB_DEVICE(USB_SAMSUNG_VENDOR_ID, USB_SAMSUNG_SEW2001U2_ID)},
+	{USB_DEVICE(USB_SAMSUNG_VENDOR_ID, USB_SAMSUNG_SEW2003U_ID)},
+	{USB_DEVICE(USB_IGATE_VENDOR_ID, USB_IGATE_IGATE_11M_ID)},
+	{USB_DEVICE(USB_FUJITSU_VENDOR_ID, USB_FUJITSU_E1100_ID)},
+	{USB_DEVICE(USB_2WIRE_VENDOR_ID, USB_2WIRE_WIRELESS_ID)},
+	{USB_DEVICE(USB_AGERE_VENDOR_ID, USB_AGERE_REBRANDED_ID)},
+	{}			/* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, ezusb_table);
+
+/* Structure to hold all of our device specific stuff */
+struct ezusb_priv {
+	struct usb_device *udev;
+	struct net_device *dev;
+	struct mutex mtx;
+	spinlock_t req_lock;
+	struct list_head req_pending;
+	struct list_head req_active;
+	spinlock_t reply_count_lock;
+	u16 hermes_reg_fake[0x40];
+	u8 *bap_buf;
+	struct urb *read_urb;
+	int read_pipe;
+	int write_pipe;
+	u8 reply_count;
+};
+
+enum ezusb_state {
+	EZUSB_CTX_START,
+	EZUSB_CTX_QUEUED,
+	EZUSB_CTX_REQ_SUBMITTED,
+	EZUSB_CTX_REQ_COMPLETE,
+	EZUSB_CTX_RESP_RECEIVED,
+	EZUSB_CTX_REQ_TIMEOUT,
+	EZUSB_CTX_REQ_FAILED,
+	EZUSB_CTX_RESP_TIMEOUT,
+	EZUSB_CTX_REQSUBMIT_FAIL,
+	EZUSB_CTX_COMPLETE,
+};
+
+struct request_context {
+	struct list_head list;
+	atomic_t refcount;
+	struct completion done;	/* Signals that CTX is dead */
+	int killed;
+	struct urb *outurb;	/* OUT for req pkt */
+	struct ezusb_priv *upriv;
+	struct ezusb_packet *buf;
+	int buf_length;
+	struct timer_list timer;	/* Timeout handling */
+	enum ezusb_state state;	/* Current state */
+	/* the RID that we will wait for */
+	u16 out_rid;
+	u16 in_rid;
+};
+
+
+/* Forward declarations */
+static void ezusb_ctx_complete(struct request_context *ctx);
+static void ezusb_req_queue_run(struct ezusb_priv *upriv);
+static void ezusb_bulk_in_callback(struct urb *urb);
+
+static inline u8 ezusb_reply_inc(u8 count)
+{
+	if (count < 0x7F)
+		return count + 1;
+	else
+		return 1;
+}
+
+static void ezusb_request_context_put(struct request_context *ctx)
+{
+	if (!atomic_dec_and_test(&ctx->refcount))
+		return;
+
+	WARN_ON(!ctx->done.done);
+	BUG_ON(ctx->outurb->status == -EINPROGRESS);
+	BUG_ON(timer_pending(&ctx->timer));
+	usb_free_urb(ctx->outurb);
+	kfree(ctx->buf);
+	kfree(ctx);
+}
+
+static inline void ezusb_mod_timer(struct ezusb_priv *upriv,
+				   struct timer_list *timer,
+				   unsigned long expire)
+{
+	if (!upriv->udev)
+		return;
+	mod_timer(timer, expire);
+}
+
+static void ezusb_request_timerfn(u_long _ctx)
+{
+	struct request_context *ctx = (void *) _ctx;
+
+	ctx->outurb->transfer_flags |= URB_ASYNC_UNLINK;
+	if (usb_unlink_urb(ctx->outurb) == -EINPROGRESS) {
+		ctx->state = EZUSB_CTX_REQ_TIMEOUT;
+	} else {
+		ctx->state = EZUSB_CTX_RESP_TIMEOUT;
+		dbg("couldn't unlink");
+		atomic_inc(&ctx->refcount);
+		ctx->killed = 1;
+		ezusb_ctx_complete(ctx);
+		ezusb_request_context_put(ctx);
+	}
+};
+
+static struct request_context *ezusb_alloc_ctx(struct ezusb_priv *upriv,
+					       u16 out_rid, u16 in_rid)
+{
+	struct request_context *ctx;
+
+	ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC);
+	if (!ctx)
+		return NULL;
+
+	memset(ctx, 0, sizeof(*ctx));
+
+	ctx->buf = kmalloc(BULK_BUF_SIZE, GFP_ATOMIC);
+	if (!ctx->buf) {
+		kfree(ctx);
+		return NULL;
+	}
+	ctx->outurb = usb_alloc_urb(0, GFP_ATOMIC);
+	if (!ctx->outurb) {
+		kfree(ctx->buf);
+		kfree(ctx);
+		return NULL;
+	}
+
+	ctx->upriv = upriv;
+	ctx->state = EZUSB_CTX_START;
+	ctx->out_rid = out_rid;
+	ctx->in_rid = in_rid;
+
+	atomic_set(&ctx->refcount, 1);
+	init_completion(&ctx->done);
+
+	init_timer(&ctx->timer);
+	ctx->timer.function = ezusb_request_timerfn;
+	ctx->timer.data = (u_long) ctx;
+	return ctx;
+}
+
+
+/* Hopefully the real complete_all will soon be exported, in the mean
+ * while this should work. */
+static inline void ezusb_complete_all(struct completion *comp)
+{
+	complete(comp);
+	complete(comp);
+	complete(comp);
+	complete(comp);
+}
+
+static void ezusb_ctx_complete(struct request_context *ctx)
+{
+	struct ezusb_priv *upriv = ctx->upriv;
+	unsigned long flags;
+
+	spin_lock_irqsave(&upriv->req_lock, flags);
+
+	list_del_init(&ctx->list);
+	if (upriv->udev) {
+		spin_unlock_irqrestore(&upriv->req_lock, flags);
+		ezusb_req_queue_run(upriv);
+		spin_lock_irqsave(&upriv->req_lock, flags);
+	}
+
+	switch (ctx->state) {
+	case EZUSB_CTX_COMPLETE:
+	case EZUSB_CTX_REQSUBMIT_FAIL:
+	case EZUSB_CTX_REQ_FAILED:
+	case EZUSB_CTX_REQ_TIMEOUT:
+	case EZUSB_CTX_RESP_TIMEOUT:
+		spin_unlock_irqrestore(&upriv->req_lock, flags);
+
+		if ((ctx->out_rid == EZUSB_RID_TX) && upriv->dev) {
+			struct net_device *dev = upriv->dev;
+			struct orinoco_private *priv = ndev_priv(dev);
+			struct net_device_stats *stats = &priv->stats;
+
+			if (ctx->state != EZUSB_CTX_COMPLETE)
+				stats->tx_errors++;
+			else
+				stats->tx_packets++;
+
+			netif_wake_queue(dev);
+		}
+		ezusb_complete_all(&ctx->done);
+		ezusb_request_context_put(ctx);
+		break;
+
+	default:
+		spin_unlock_irqrestore(&upriv->req_lock, flags);
+		if (!upriv->udev) {
+			/* This is normal, as all request contexts get flushed
+			 * when the device is disconnected */
+			err("Called, CTX not terminating, but device gone");
+			ezusb_complete_all(&ctx->done);
+			ezusb_request_context_put(ctx);
+			break;
+		}
+
+		err("Called, CTX not in terminating state.");
+		/* Things are really bad if this happens. Just leak
+		 * the CTX because it may still be linked to the
+		 * queue or the OUT urb may still be active.
+		 * Just leaking at least prevents an Oops or Panic.
+		 */
+		break;
+	}
+}
+
+/**
+ * ezusb_req_queue_run:
+ * Description:
+ *	Note: Only one active CTX at any one time, because there's no
+ *	other (reliable) way to match the response URB to the correct
+ *	CTX.
+ **/
+static void ezusb_req_queue_run(struct ezusb_priv *upriv)
+{
+	unsigned long flags;
+	struct request_context *ctx;
+	int result;
+
+	spin_lock_irqsave(&upriv->req_lock, flags);
+
+	if (!list_empty(&upriv->req_active))
+		goto unlock;
+
+	if (list_empty(&upriv->req_pending))
+		goto unlock;
+
+	ctx =
+	    list_entry(upriv->req_pending.next, struct request_context,
+		       list);
+
+	if (!ctx->upriv->udev)
+		goto unlock;
+
+	/* We need to split this off to avoid a race condition */
+	list_move_tail(&ctx->list, &upriv->req_active);
+
+	if (ctx->state == EZUSB_CTX_QUEUED) {
+		atomic_inc(&ctx->refcount);
+		result = usb_submit_urb(ctx->outurb, GFP_ATOMIC);
+		if (result) {
+			ctx->state = EZUSB_CTX_REQSUBMIT_FAIL;
+
+			spin_unlock_irqrestore(&upriv->req_lock, flags);
+
+			err("Fatal, failed to submit command urb."
+			    " error=%d\n", result);
+
+			ezusb_ctx_complete(ctx);
+			ezusb_request_context_put(ctx);
+			goto done;
+		}
+
+		ctx->state = EZUSB_CTX_REQ_SUBMITTED;
+		ezusb_mod_timer(ctx->upriv, &ctx->timer,
+				jiffies + DEF_TIMEOUT);
+	}
+
+ unlock:
+	spin_unlock_irqrestore(&upriv->req_lock, flags);
+
+ done:
+	return;
+}
+
+static void ezusb_req_enqueue_run(struct ezusb_priv *upriv,
+				  struct request_context *ctx)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&upriv->req_lock, flags);
+
+	if (!ctx->upriv->udev) {
+		spin_unlock_irqrestore(&upriv->req_lock, flags);
+		goto done;
+	}
+	atomic_inc(&ctx->refcount);
+	list_add_tail(&ctx->list, &upriv->req_pending);
+	spin_unlock_irqrestore(&upriv->req_lock, flags);
+
+	ctx->state = EZUSB_CTX_QUEUED;
+	ezusb_req_queue_run(upriv);
+
+ done:
+	return;
+}
+
+static void ezusb_request_out_callback(struct urb *urb)
+{
+	unsigned long flags;
+	enum ezusb_state state;
+	struct request_context *ctx = urb->context;
+	struct ezusb_priv *upriv = ctx->upriv;
+
+	spin_lock_irqsave(&upriv->req_lock, flags);
+
+	del_timer(&ctx->timer);
+
+	if (ctx->killed) {
+		spin_unlock_irqrestore(&upriv->req_lock, flags);
+		pr_warning("interrupt called with dead ctx");
+		goto out;
+	}
+
+	state = ctx->state;
+
+	if (urb->status == 0) {
+		switch (state) {
+		case EZUSB_CTX_REQ_SUBMITTED:
+			if (ctx->in_rid) {
+				ctx->state = EZUSB_CTX_REQ_COMPLETE;
+				/* reply URB still pending */
+				ezusb_mod_timer(upriv, &ctx->timer,
+						jiffies + DEF_TIMEOUT);
+				spin_unlock_irqrestore(&upriv->req_lock,
+						       flags);
+				break;
+			}
+			/* fall through */
+		case EZUSB_CTX_RESP_RECEIVED:
+			/* IN already received before this OUT-ACK */
+			ctx->state = EZUSB_CTX_COMPLETE;
+			spin_unlock_irqrestore(&upriv->req_lock, flags);
+			ezusb_ctx_complete(ctx);
+			break;
+
+		default:
+			spin_unlock_irqrestore(&upriv->req_lock, flags);
+			err("Unexpected state(0x%x, %d) in OUT URB",
+			    state, urb->status);
+			break;
+		}
+	} else {
+		/* If someone cancels the OUT URB then its status
+		 * should be either -ECONNRESET or -ENOENT.
+		 */
+		switch (state) {
+		case EZUSB_CTX_REQ_SUBMITTED:
+		case EZUSB_CTX_RESP_RECEIVED:
+			ctx->state = EZUSB_CTX_REQ_FAILED;
+			/* fall through */
+
+		case EZUSB_CTX_REQ_FAILED:
+		case EZUSB_CTX_REQ_TIMEOUT:
+			spin_unlock_irqrestore(&upriv->req_lock, flags);
+
+			ezusb_ctx_complete(ctx);
+			break;
+
+		default:
+			spin_unlock_irqrestore(&upriv->req_lock, flags);
+
+			err("Unexpected state(0x%x, %d) in OUT URB",
+			    state, urb->status);
+			break;
+		}
+	}
+ out:
+	ezusb_request_context_put(ctx);
+}
+
+static void ezusb_request_in_callback(struct ezusb_priv *upriv,
+				      struct urb *urb)
+{
+	struct ezusb_packet *ans = urb->transfer_buffer;
+	struct request_context *ctx = NULL;
+	enum ezusb_state state;
+	unsigned long flags;
+
+	/* Find the CTX on the active queue that requested this URB */
+	spin_lock_irqsave(&upriv->req_lock, flags);
+	if (upriv->udev) {
+		struct list_head *item;
+
+		list_for_each(item, &upriv->req_active) {
+			struct request_context *c;
+			int reply_count;
+
+			c = list_entry(item, struct request_context, list);
+			reply_count =
+			    ezusb_reply_inc(c->buf->req_reply_count);
+			if ((ans->ans_reply_count == reply_count)
+			    && (le16_to_cpu(ans->hermes_rid) == c->in_rid)) {
+				ctx = c;
+				break;
+			}
+			dbg("Skipped (0x%x/0x%x) (%d/%d)",
+			    le16_to_cpu(ans->hermes_rid),
+			    c->in_rid, ans->ans_reply_count, reply_count);
+		}
+	}
+
+	if (ctx == NULL) {
+		spin_unlock_irqrestore(&upriv->req_lock, flags);
+		err("%s: got unexpected RID: 0x%04X", __func__,
+		    le16_to_cpu(ans->hermes_rid));
+		ezusb_req_queue_run(upriv);
+		return;
+	}
+
+	/* The data we want is in the in buffer, exchange */
+	urb->transfer_buffer = ctx->buf;
+	ctx->buf = (void *) ans;
+	ctx->buf_length = urb->actual_length;
+
+	state = ctx->state;
+	switch (state) {
+	case EZUSB_CTX_REQ_SUBMITTED:
+		/* We have received our response URB before
+		 * our request has been acknowledged. Do NOT
+		 * destroy our CTX yet, because our OUT URB
+		 * is still alive ...
+		 */
+		ctx->state = EZUSB_CTX_RESP_RECEIVED;
+		spin_unlock_irqrestore(&upriv->req_lock, flags);
+
+		/* Let the machine continue running. */
+		break;
+
+	case EZUSB_CTX_REQ_COMPLETE:
+		/* This is the usual path: our request
+		 * has already been acknowledged, and
+		 * we have now received the reply.
+		 */
+		ctx->state = EZUSB_CTX_COMPLETE;
+
+		/* Stop the intimer */
+		del_timer(&ctx->timer);
+		spin_unlock_irqrestore(&upriv->req_lock, flags);
+
+		/* Call the completion handler */
+		ezusb_ctx_complete(ctx);
+		break;
+
+	default:
+		spin_unlock_irqrestore(&upriv->req_lock, flags);
+
+		pr_warning("Matched IN URB, unexpected context state(0x%x)",
+		     state);
+		/* Throw this CTX away and try submitting another */
+		del_timer(&ctx->timer);
+		ctx->outurb->transfer_flags |= URB_ASYNC_UNLINK;
+		usb_unlink_urb(ctx->outurb);
+		ezusb_req_queue_run(upriv);
+		break;
+	}			/* switch */
+}
+
+
+static void ezusb_req_ctx_wait(struct ezusb_priv *upriv,
+			       struct request_context *ctx)
+{
+	switch (ctx->state) {
+	case EZUSB_CTX_QUEUED:
+	case EZUSB_CTX_REQ_SUBMITTED:
+	case EZUSB_CTX_REQ_COMPLETE:
+	case EZUSB_CTX_RESP_RECEIVED:
+		if (in_atomic()) {
+			/* If we get called from a timer, timeout timers don't
+			 * get the chance to run themselves. So we make sure
+			 * that we don't sleep for ever */
+			int msecs = DEF_TIMEOUT * (1000 / HZ);
+			while (!ctx->done.done && msecs--)
+				udelay(1000);
+		} else {
+			wait_event_interruptible(ctx->done.wait,
+						 ctx->done.done);
+		}
+		break;
+	default:
+		/* Done or failed - nothing to wait for */
+		break;
+	}
+}
+
+static inline u16 build_crc(struct ezusb_packet *data)
+{
+	u16 crc = 0;
+	u8 *bytes = (u8 *)data;
+	int i;
+
+	for (i = 0; i < 8; i++)
+		crc = (crc << 1) + bytes[i];
+
+	return crc;
+}
+
+/**
+ * ezusb_fill_req:
+ *
+ * if data == NULL and length > 0 the data is assumed to be already in
+ * the target buffer and only the header is filled.
+ *
+ */
+static int ezusb_fill_req(struct ezusb_packet *req, u16 length, u16 rid,
+			  const void *data, u16 frame_type, u8 reply_count)
+{
+	int total_size = sizeof(*req) + length;
+
+	BUG_ON(total_size > BULK_BUF_SIZE);
+
+	req->magic = cpu_to_le16(EZUSB_MAGIC);
+	req->req_reply_count = reply_count;
+	req->ans_reply_count = 0;
+	req->frame_type = cpu_to_le16(frame_type);
+	req->size = cpu_to_le16(length + 4);
+	req->crc = cpu_to_le16(build_crc(req));
+	req->hermes_len = cpu_to_le16(HERMES_BYTES_TO_RECLEN(length));
+	req->hermes_rid = cpu_to_le16(rid);
+	if (data)
+		memcpy(req->data, data, length);
+	return total_size;
+}
+
+static int ezusb_submit_in_urb(struct ezusb_priv *upriv)
+{
+	int retval = 0;
+	void *cur_buf = upriv->read_urb->transfer_buffer;
+
+	if (upriv->read_urb->status == -EINPROGRESS) {
+		dbg("urb busy, not resubmiting");
+		retval = -EBUSY;
+		goto exit;
+	}
+	usb_fill_bulk_urb(upriv->read_urb, upriv->udev, upriv->read_pipe,
+			  cur_buf, BULK_BUF_SIZE,
+			  ezusb_bulk_in_callback, upriv);
+	upriv->read_urb->transfer_flags = 0;
+	retval = usb_submit_urb(upriv->read_urb, GFP_ATOMIC);
+	if (retval)
+		err("%s submit failed %d", __func__, retval);
+
+ exit:
+	return retval;
+}
+
+static inline int ezusb_8051_cpucs(struct ezusb_priv *upriv, int reset)
+{
+	u8 res_val = reset;	/* avoid argument promotion */
+
+	if (!upriv->udev) {
+		err("%s: !upriv->udev", __func__);
+		return -EFAULT;
+	}
+	return usb_control_msg(upriv->udev,
+			       usb_sndctrlpipe(upriv->udev, 0),
+			       EZUSB_REQUEST_FW_TRANS,
+			       USB_TYPE_VENDOR | USB_RECIP_DEVICE |
+			       USB_DIR_OUT, EZUSB_CPUCS_REG, 0, &res_val,
+			       sizeof(res_val), DEF_TIMEOUT);
+}
+
+static int ezusb_firmware_download(struct ezusb_priv *upriv,
+				   struct ez_usb_fw *fw)
+{
+	u8 fw_buffer[FW_BUF_SIZE];
+	int retval, addr;
+	int variant_offset;
+
+	/*
+	 * This byte is 1 and should be replaced with 0.  The offset is
+	 * 0x10AD in version 0.0.6.  The byte in question should follow
+	 * the end of the code pointed to by the jump in the beginning
+	 * of the firmware.  Also, it is read by code located at 0x358.
+	 */
+	variant_offset = be16_to_cpup((__be16 *) &fw->code[FW_VAR_OFFSET_PTR]);
+	if (variant_offset >= fw->size) {
+		printk(KERN_ERR PFX "Invalid firmware variant offset: "
+		       "0x%04x\n", variant_offset);
+		retval = -EINVAL;
+		goto fail;
+	}
+
+	retval = ezusb_8051_cpucs(upriv, 1);
+	if (retval < 0)
+		goto fail;
+	for (addr = 0; addr < fw->size; addr += FW_BUF_SIZE) {
+		/* 0x100-0x300 should be left alone, it contains card
+		 * specific data, like USB enumeration information */
+		if ((addr >= FW_HOLE_START) && (addr < FW_HOLE_END))
+			continue;
+
+		memcpy(fw_buffer, &fw->code[addr], FW_BUF_SIZE);
+		if (variant_offset >= addr &&
+		    variant_offset < addr + FW_BUF_SIZE) {
+			dbg("Patching card_variant byte at 0x%04X",
+			    variant_offset);
+			fw_buffer[variant_offset - addr] = FW_VAR_VALUE;
+		}
+		retval = usb_control_msg(upriv->udev,
+					 usb_sndctrlpipe(upriv->udev, 0),
+					 EZUSB_REQUEST_FW_TRANS,
+					 USB_TYPE_VENDOR | USB_RECIP_DEVICE
+					 | USB_DIR_OUT,
+					 addr, 0x0,
+					 fw_buffer, FW_BUF_SIZE,
+					 DEF_TIMEOUT);
+
+		if (retval < 0)
+			goto fail;
+	}
+	retval = ezusb_8051_cpucs(upriv, 0);
+	if (retval < 0)
+		goto fail;
+
+	goto exit;
+ fail:
+	printk(KERN_ERR PFX "Firmware download failed, error %d\n",
+	       retval);
+ exit:
+	return retval;
+}
+
+static int ezusb_access_ltv(struct ezusb_priv *upriv,
+			    struct request_context *ctx,
+			    u16 length, const void *data, u16 frame_type,
+			    void *ans_buff, int ans_size, u16 *ans_length)
+{
+	int req_size;
+	int retval = 0;
+	enum ezusb_state state;
+
+	BUG_ON(in_irq());
+
+	if (!upriv->udev) {
+		dbg("Device disconnected");
+		return -ENODEV;
+	}
+
+	if (upriv->read_urb->status != -EINPROGRESS)
+		err("%s: in urb not pending", __func__);
+
+	/* protect upriv->reply_count, guarantee sequential numbers */
+	spin_lock_bh(&upriv->reply_count_lock);
+	req_size = ezusb_fill_req(ctx->buf, length, ctx->out_rid, data,
+				  frame_type, upriv->reply_count);
+	usb_fill_bulk_urb(ctx->outurb, upriv->udev, upriv->write_pipe,
+			  ctx->buf, req_size,
+			  ezusb_request_out_callback, ctx);
+
+	if (ctx->in_rid)
+		upriv->reply_count = ezusb_reply_inc(upriv->reply_count);
+
+	ezusb_req_enqueue_run(upriv, ctx);
+
+	spin_unlock_bh(&upriv->reply_count_lock);
+
+	if (ctx->in_rid)
+		ezusb_req_ctx_wait(upriv, ctx);
+
+	state = ctx->state;
+	switch (state) {
+	case EZUSB_CTX_COMPLETE:
+		retval = ctx->outurb->status;
+		break;
+
+	case EZUSB_CTX_QUEUED:
+	case EZUSB_CTX_REQ_SUBMITTED:
+		if (!ctx->in_rid)
+			break;
+	default:
+		err("%s: Unexpected context state %d", __func__,
+		    state);
+		/* fall though */
+	case EZUSB_CTX_REQ_TIMEOUT:
+	case EZUSB_CTX_REQ_FAILED:
+	case EZUSB_CTX_RESP_TIMEOUT:
+	case EZUSB_CTX_REQSUBMIT_FAIL:
+		printk(KERN_ERR PFX "Access failed, resetting (state %d,"
+		       " reply_count %d)\n", state, upriv->reply_count);
+		upriv->reply_count = 0;
+		if (state == EZUSB_CTX_REQ_TIMEOUT
+		    || state == EZUSB_CTX_RESP_TIMEOUT) {
+			printk(KERN_ERR PFX "ctx timed out\n");
+			retval = -ETIMEDOUT;
+		} else {
+			printk(KERN_ERR PFX "ctx failed\n");
+			retval = -EFAULT;
+		}
+		goto exit;
+		break;
+	}
+	if (ctx->in_rid) {
+		struct ezusb_packet *ans = ctx->buf;
+		int exp_len;
+
+		if (ans->hermes_len != 0)
+			exp_len = le16_to_cpu(ans->hermes_len) * 2 + 12;
+		else
+			exp_len = 14;
+
+		if (exp_len != ctx->buf_length) {
+			err("%s: length mismatch for RID 0x%04x: "
+			    "expected %d, got %d", __func__,
+			    ctx->in_rid, exp_len, ctx->buf_length);
+			retval = -EIO;
+			goto exit;
+		}
+
+		if (ans_buff)
+			memcpy(ans_buff, ans->data,
+			       min_t(int, exp_len, ans_size));
+		if (ans_length)
+			*ans_length = le16_to_cpu(ans->hermes_len);
+	}
+ exit:
+	ezusb_request_context_put(ctx);
+	return retval;
+}
+
+static int ezusb_write_ltv(hermes_t *hw, int bap, u16 rid,
+			   u16 length, const void *data)
+{
+	struct ezusb_priv *upriv = hw->priv;
+	u16 frame_type;
+	struct request_context *ctx;
+
+	if (length == 0)
+		return -EINVAL;
+
+	length = HERMES_RECLEN_TO_BYTES(length);
+
+	/* On memory mapped devices HERMES_RID_CNFGROUPADDRESSES can be
+	 * set to be empty, but the USB bridge doesn't like it */
+	if (length == 0)
+		return 0;
+
+	ctx = ezusb_alloc_ctx(upriv, rid, EZUSB_RID_ACK);
+	if (!ctx)
+		return -ENOMEM;
+
+	if (rid == EZUSB_RID_TX)
+		frame_type = EZUSB_FRAME_DATA;
+	else
+		frame_type = EZUSB_FRAME_CONTROL;
+
+	return ezusb_access_ltv(upriv, ctx, length, data, frame_type,
+				NULL, 0, NULL);
+}
+
+static int ezusb_read_ltv(hermes_t *hw, int bap, u16 rid,
+			  unsigned bufsize, u16 *length, void *buf)
+{
+	struct ezusb_priv *upriv = hw->priv;
+	struct request_context *ctx;
+
+	if ((bufsize < 0) || (bufsize % 2))
+		return -EINVAL;
+
+	ctx = ezusb_alloc_ctx(upriv, rid, rid);
+	if (!ctx)
+		return -ENOMEM;
+
+	return ezusb_access_ltv(upriv, ctx, 0, NULL, EZUSB_FRAME_CONTROL,
+				buf, bufsize, length);
+}
+
+static int ezusb_doicmd_wait(hermes_t *hw, u16 cmd, u16 parm0, u16 parm1,
+			     u16 parm2, struct hermes_response *resp)
+{
+	struct ezusb_priv *upriv = hw->priv;
+	struct request_context *ctx;
+
+	__le16 data[4] = {
+		cpu_to_le16(cmd),
+		cpu_to_le16(parm0),
+		cpu_to_le16(parm1),
+		cpu_to_le16(parm2),
+	};
+	dbg("0x%04X, parm0 0x%04X, parm1 0x%04X, parm2 0x%04X",
+	    cmd, parm0, parm1, parm2);
+	ctx = ezusb_alloc_ctx(upriv, EZUSB_RID_DOCMD, EZUSB_RID_ACK);
+	if (!ctx)
+		return -ENOMEM;
+
+	return ezusb_access_ltv(upriv, ctx, sizeof(data), &data,
+				EZUSB_FRAME_CONTROL, NULL, 0, NULL);
+}
+
+static int ezusb_docmd_wait(hermes_t *hw, u16 cmd, u16 parm0,
+			    struct hermes_response *resp)
+{
+	struct ezusb_priv *upriv = hw->priv;
+	struct request_context *ctx;
+
+	__le16 data[4] = {
+		cpu_to_le16(cmd),
+		cpu_to_le16(parm0),
+		0,
+		0,
+	};
+	dbg("0x%04X, parm0 0x%04X", cmd, parm0);
+	ctx = ezusb_alloc_ctx(upriv, EZUSB_RID_DOCMD, EZUSB_RID_ACK);
+	if (!ctx)
+		return -ENOMEM;
+
+	return ezusb_access_ltv(upriv, ctx, sizeof(data), &data,
+				EZUSB_FRAME_CONTROL, NULL, 0, NULL);
+}
+
+static int ezusb_bap_pread(struct hermes *hw, int bap,
+			   void *buf, int len, u16 id, u16 offset)
+{
+	struct ezusb_priv *upriv = hw->priv;
+	struct ezusb_packet *ans = (void *) upriv->read_urb->transfer_buffer;
+	int actual_length = upriv->read_urb->actual_length;
+
+	if (id == EZUSB_RID_RX) {
+		if ((sizeof(*ans) + offset + len) > actual_length) {
+			printk(KERN_ERR PFX "BAP read beyond buffer end "
+			       "in rx frame\n");
+			return -EINVAL;
+		}
+		memcpy(buf, ans->data + offset, len);
+		return 0;
+	}
+
+	if (EZUSB_IS_INFO(id)) {
+		/* Include 4 bytes for length/type */
+		if ((sizeof(*ans) + offset + len - 4) > actual_length) {
+			printk(KERN_ERR PFX "BAP read beyond buffer end "
+			       "in info frame\n");
+			return -EFAULT;
+		}
+		memcpy(buf, ans->data + offset - 4, len);
+	} else {
+		printk(KERN_ERR PFX "Unexpected fid 0x%04x\n", id);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static netdev_tx_t ezusb_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct orinoco_private *priv = ndev_priv(dev);
+	struct net_device_stats *stats = &priv->stats;
+	struct ezusb_priv *upriv = priv->card;
+	int err = 0;
+	char *p;
+	struct ethhdr *eh;
+	int len, data_len, data_off;
+	__le16 tx_control;
+	unsigned long flags;
+	struct request_context *ctx;
+	u8 *buf;
+	int tx_size;
+
+	if (!netif_running(dev)) {
+		printk(KERN_ERR "%s: Tx on stopped device!\n",
+		       dev->name);
+		return NETDEV_TX_BUSY;
+	}
+
+	if (netif_queue_stopped(dev)) {
+		printk(KERN_DEBUG "%s: Tx while transmitter busy!\n",
+		       dev->name);
+		return NETDEV_TX_BUSY;
+	}
+
+	if (orinoco_lock(priv, &flags) != 0) {
+		printk(KERN_ERR
+		       "%s: orinoco_xmit() called while hw_unavailable\n",
+		       dev->name);
+		return NETDEV_TX_BUSY;
+	}
+
+	if (!netif_carrier_ok(dev) ||
+	    (priv->iw_mode == NL80211_IFTYPE_MONITOR)) {
+		/* Oops, the firmware hasn't established a connection,
+		   silently drop the packet (this seems to be the
+		   safest approach). */
+		stats->tx_errors++;
+		orinoco_unlock(priv, &flags);
+		dev_kfree_skb(skb);
+		return NETDEV_TX_OK;
+	}
+
+	ctx = ezusb_alloc_ctx(upriv, EZUSB_RID_TX, 0);
+	if (!ctx)
+		goto fail;
+
+	memset(ctx->buf, 0, BULK_BUF_SIZE);
+	buf = ctx->buf->data;
+
+	/* Length of the packet body */
+	/* FIXME: what if the skb is smaller than this? */
+	len = max_t(int, skb->len - ETH_HLEN, ETH_ZLEN - ETH_HLEN);
+
+	eh = (struct ethhdr *) skb->data;
+
+	tx_control = cpu_to_le16(0);
+	memcpy(buf, &tx_control, sizeof(tx_control));
+	buf += sizeof(tx_control);
+	/* Encapsulate Ethernet-II frames */
+	if (ntohs(eh->h_proto) > ETH_DATA_LEN) {	/* Ethernet-II frame */
+		struct header_struct *hdr = (void *) buf;
+		buf += sizeof(*hdr);
+		data_len = len;
+		data_off = sizeof(tx_control) + sizeof(*hdr);
+		p = skb->data + ETH_HLEN;
+
+		/* 802.3 header */
+		memcpy(hdr->dest, eh->h_dest, ETH_ALEN);
+		memcpy(hdr->src, eh->h_source, ETH_ALEN);
+		hdr->len = htons(data_len + ENCAPS_OVERHEAD);
+
+		/* 802.2 header */
+		memcpy(&hdr->dsap, &encaps_hdr, sizeof(encaps_hdr));
+
+		hdr->ethertype = eh->h_proto;
+	} else {		/* IEEE 802.3 frame */
+		data_len = len + ETH_HLEN;
+		data_off = sizeof(tx_control);
+		p = skb->data;
+	}
+
+	memcpy(buf, p, data_len);
+	buf += data_len;
+
+	/* Finally, we actually initiate the send */
+	netif_stop_queue(dev);
+
+	/* The card may behave better if we send evenly sized usb transfers */
+	tx_size = ALIGN(buf - ctx->buf->data, 2);
+
+	err = ezusb_access_ltv(upriv, ctx, tx_size, NULL,
+			       EZUSB_FRAME_DATA, NULL, 0, NULL);
+
+	if (err) {
+		netif_start_queue(dev);
+		if (net_ratelimit())
+			printk(KERN_ERR "%s: Error %d transmitting packet\n",
+				dev->name, err);
+		stats->tx_errors++;
+		goto fail;
+	}
+
+	dev->trans_start = jiffies;
+	stats->tx_bytes += data_off + data_len;
+
+	orinoco_unlock(priv, &flags);
+
+	dev_kfree_skb(skb);
+
+	return NETDEV_TX_OK;
+
+ fail:
+	orinoco_unlock(priv, &flags);
+	return NETDEV_TX_BUSY;
+}
+
+static int ezusb_allocate(struct hermes *hw, u16 size, u16 *fid)
+{
+	*fid = EZUSB_RID_TX;
+	return 0;
+}
+
+
+static int ezusb_hard_reset(struct orinoco_private *priv)
+{
+	struct ezusb_priv *upriv = priv->card;
+	int retval = ezusb_8051_cpucs(upriv, 1);
+
+	if (retval < 0) {
+		err("Failed to reset");
+		return retval;
+	}
+
+	retval = ezusb_8051_cpucs(upriv, 0);
+	if (retval < 0) {
+		err("Failed to unreset");
+		return retval;
+	}
+
+	dbg("sending control message");
+	retval = usb_control_msg(upriv->udev,
+				 usb_sndctrlpipe(upriv->udev, 0),
+				 EZUSB_REQUEST_TRIGER,
+				 USB_TYPE_VENDOR | USB_RECIP_DEVICE |
+				 USB_DIR_OUT, 0x0, 0x0, NULL, 0,
+				 DEF_TIMEOUT);
+	if (retval < 0) {
+		err("EZUSB_REQUEST_TRIGER failed retval %d", retval);
+		return retval;
+	}
+#if 0
+	dbg("Sending EZUSB_REQUEST_TRIG_AC");
+	retval = usb_control_msg(upriv->udev,
+				 usb_sndctrlpipe(upriv->udev, 0),
+				 EZUSB_REQUEST_TRIG_AC,
+				 USB_TYPE_VENDOR | USB_RECIP_DEVICE |
+				 USB_DIR_OUT, 0x00FA, 0x0, NULL, 0,
+				 DEF_TIMEOUT);
+	if (retval < 0) {
+		err("EZUSB_REQUEST_TRIG_AC failed retval %d", retval);
+		return retval;
+	}
+#endif
+
+	return 0;
+}
+
+
+static int ezusb_init(hermes_t *hw)
+{
+	struct ezusb_priv *upriv = hw->priv;
+	int retval;
+
+	BUG_ON(in_interrupt());
+	BUG_ON(!upriv);
+
+	upriv->reply_count = 0;
+	/* Write the MAGIC number on the simulated registers to keep
+	 * orinoco.c happy */
+	hermes_write_regn(hw, SWSUPPORT0, HERMES_MAGIC);
+	hermes_write_regn(hw, RXFID, EZUSB_RID_RX);
+
+	usb_kill_urb(upriv->read_urb);
+	ezusb_submit_in_urb(upriv);
+
+	retval = ezusb_write_ltv(hw, 0, EZUSB_RID_INIT1,
+				 HERMES_BYTES_TO_RECLEN(2), "\x10\x00");
+	if (retval < 0) {
+		printk(KERN_ERR PFX "EZUSB_RID_INIT1 error %d\n", retval);
+		return retval;
+	}
+
+	retval = ezusb_docmd_wait(hw, HERMES_CMD_INIT, 0, NULL);
+	if (retval < 0) {
+		printk(KERN_ERR PFX "HERMES_CMD_INIT error %d\n", retval);
+		return retval;
+	}
+
+	return 0;
+}
+
+static void ezusb_bulk_in_callback(struct urb *urb)
+{
+	struct ezusb_priv *upriv = (struct ezusb_priv *) urb->context;
+	struct ezusb_packet *ans = urb->transfer_buffer;
+	u16 crc;
+	u16 hermes_rid;
+
+	if (upriv->udev == NULL) {
+		dbg("disconnected");
+		return;
+	}
+
+	if (urb->status == -ETIMEDOUT) {
+		/* When a device gets unplugged we get this every time
+		 * we resubmit, flooding the logs.  Since we don't use
+		 * USB timeouts, it shouldn't happen any other time*/
+		pr_warning("%s: urb timed out, not resubmiting", __func__);
+		return;
+	}
+	if (urb->status == -ECONNABORTED) {
+		pr_warning("%s: connection abort, resubmiting urb",
+		     __func__);
+		goto resubmit;
+	}
+	if ((urb->status == -EILSEQ)
+	    || (urb->status == -ENOENT)
+	    || (urb->status == -ECONNRESET)) {
+		dbg("status %d, not resubmiting", urb->status);
+		return;
+	}
+	if (urb->status)
+		dbg("status: %d length: %d",
+		    urb->status, urb->actual_length);
+	if (urb->actual_length < sizeof(*ans)) {
+		err("%s: short read, ignoring", __func__);
+		goto resubmit;
+	}
+	crc = build_crc(ans);
+	if (le16_to_cpu(ans->crc) != crc) {
+		err("CRC error, ignoring packet");
+		goto resubmit;
+	}
+
+	hermes_rid = le16_to_cpu(ans->hermes_rid);
+	if ((hermes_rid != EZUSB_RID_RX) && !EZUSB_IS_INFO(hermes_rid)) {
+		ezusb_request_in_callback(upriv, urb);
+	} else if (upriv->dev) {
+		struct net_device *dev = upriv->dev;
+		struct orinoco_private *priv = ndev_priv(dev);
+		hermes_t *hw = &priv->hw;
+
+		if (hermes_rid == EZUSB_RID_RX) {
+			__orinoco_ev_rx(dev, hw);
+		} else {
+			hermes_write_regn(hw, INFOFID,
+					  le16_to_cpu(ans->hermes_rid));
+			__orinoco_ev_info(dev, hw);
+		}
+	}
+
+ resubmit:
+	if (upriv->udev)
+		ezusb_submit_in_urb(upriv);
+}
+
+static inline void ezusb_delete(struct ezusb_priv *upriv)
+{
+	struct net_device *dev;
+	struct list_head *item;
+	struct list_head *tmp_item;
+	unsigned long flags;
+
+	BUG_ON(in_interrupt());
+	BUG_ON(!upriv);
+
+	dev = upriv->dev;
+	mutex_lock(&upriv->mtx);
+
+	upriv->udev = NULL;	/* No timer will be rearmed from here */
+
+	usb_kill_urb(upriv->read_urb);
+
+	spin_lock_irqsave(&upriv->req_lock, flags);
+	list_for_each_safe(item, tmp_item, &upriv->req_active) {
+		struct request_context *ctx;
+		int err;
+
+		ctx = list_entry(item, struct request_context, list);
+		atomic_inc(&ctx->refcount);
+
+		ctx->outurb->transfer_flags |= URB_ASYNC_UNLINK;
+		err = usb_unlink_urb(ctx->outurb);
+
+		spin_unlock_irqrestore(&upriv->req_lock, flags);
+		if (err == -EINPROGRESS)
+			wait_for_completion(&ctx->done);
+
+		del_timer_sync(&ctx->timer);
+		/* FIXME: there is an slight chance for the irq handler to
+		 * be running */
+		if (!list_empty(&ctx->list))
+			ezusb_ctx_complete(ctx);
+
+		ezusb_request_context_put(ctx);
+		spin_lock_irqsave(&upriv->req_lock, flags);
+	}
+	spin_unlock_irqrestore(&upriv->req_lock, flags);
+
+	list_for_each_safe(item, tmp_item, &upriv->req_pending)
+	    ezusb_ctx_complete(list_entry(item,
+					  struct request_context, list));
+
+	if (upriv->read_urb->status == -EINPROGRESS)
+		printk(KERN_ERR PFX "Some URB in progress\n");
+
+	mutex_unlock(&upriv->mtx);
+
+	kfree(upriv->read_urb->transfer_buffer);
+	if (upriv->bap_buf != NULL)
+		kfree(upriv->bap_buf);
+	if (upriv->read_urb != NULL)
+		usb_free_urb(upriv->read_urb);
+	if (upriv->dev) {
+		struct orinoco_private *priv = ndev_priv(upriv->dev);
+		orinoco_if_del(priv);
+		free_orinocodev(priv);
+	}
+}
+
+static void ezusb_lock_irqsave(spinlock_t *lock,
+			       unsigned long *flags) __acquires(lock)
+{
+	spin_lock_bh(lock);
+}
+
+static void ezusb_unlock_irqrestore(spinlock_t *lock,
+				    unsigned long *flags) __releases(lock)
+{
+	spin_unlock_bh(lock);
+}
+
+static void ezusb_lock_irq(spinlock_t *lock) __acquires(lock)
+{
+	spin_lock_bh(lock);
+}
+
+static void ezusb_unlock_irq(spinlock_t *lock) __releases(lock)
+{
+	spin_unlock_bh(lock);
+}
+
+static const struct hermes_ops ezusb_ops = {
+	.init = ezusb_init,
+	.cmd_wait = ezusb_docmd_wait,
+	.init_cmd_wait = ezusb_doicmd_wait,
+	.allocate = ezusb_allocate,
+	.read_ltv = ezusb_read_ltv,
+	.write_ltv = ezusb_write_ltv,
+	.bap_pread = ezusb_bap_pread,
+	.lock_irqsave = ezusb_lock_irqsave,
+	.unlock_irqrestore = ezusb_unlock_irqrestore,
+	.lock_irq = ezusb_lock_irq,
+	.unlock_irq = ezusb_unlock_irq,
+};
+
+static const struct net_device_ops ezusb_netdev_ops = {
+	.ndo_open		= orinoco_open,
+	.ndo_stop		= orinoco_stop,
+	.ndo_start_xmit		= ezusb_xmit,
+	.ndo_set_multicast_list	= orinoco_set_multicast_list,
+	.ndo_change_mtu		= orinoco_change_mtu,
+	.ndo_set_mac_address	= eth_mac_addr,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_tx_timeout		= orinoco_tx_timeout,
+	.ndo_get_stats		= orinoco_get_stats,
+};
+
+static int ezusb_probe(struct usb_interface *interface,
+		       const struct usb_device_id *id)
+{
+	struct usb_device *udev = interface_to_usbdev(interface);
+	struct orinoco_private *priv;
+	hermes_t *hw;
+	struct ezusb_priv *upriv = NULL;
+	struct usb_interface_descriptor *iface_desc;
+	struct usb_endpoint_descriptor *ep;
+	const struct firmware *fw_entry;
+	int retval = 0;
+	int i;
+
+	priv = alloc_orinocodev(sizeof(*upriv), &udev->dev,
+				ezusb_hard_reset, NULL);
+	if (!priv) {
+		err("Couldn't allocate orinocodev");
+		goto exit;
+	}
+
+	hw = &priv->hw;
+
+	upriv = priv->card;
+
+	mutex_init(&upriv->mtx);
+	spin_lock_init(&upriv->reply_count_lock);
+
+	spin_lock_init(&upriv->req_lock);
+	INIT_LIST_HEAD(&upriv->req_pending);
+	INIT_LIST_HEAD(&upriv->req_active);
+
+	upriv->udev = udev;
+
+	hw->iobase = (void __force __iomem *) &upriv->hermes_reg_fake;
+	hw->reg_spacing = HERMES_16BIT_REGSPACING;
+	hw->priv = upriv;
+	hw->ops = &ezusb_ops;
+
+	/* set up the endpoint information */
+	/* check out the endpoints */
+
+	iface_desc = &interface->altsetting[0].desc;
+	for (i = 0; i < iface_desc->bNumEndpoints; ++i) {
+		ep = &interface->altsetting[0].endpoint[i].desc;
+
+		if (((ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
+		     == USB_DIR_IN) &&
+		    ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
+		     == USB_ENDPOINT_XFER_BULK)) {
+			/* we found a bulk in endpoint */
+			if (upriv->read_urb != NULL) {
+				pr_warning("Found a second bulk in ep, ignored");
+				continue;
+			}
+
+			upriv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
+			if (!upriv->read_urb) {
+				err("No free urbs available");
+				goto error;
+			}
+			if (le16_to_cpu(ep->wMaxPacketSize) != 64)
+				pr_warning("bulk in: wMaxPacketSize!= 64");
+			if (ep->bEndpointAddress != (2 | USB_DIR_IN))
+				pr_warning("bulk in: bEndpointAddress: %d",
+				     ep->bEndpointAddress);
+			upriv->read_pipe = usb_rcvbulkpipe(udev,
+							 ep->
+							 bEndpointAddress);
+			upriv->read_urb->transfer_buffer =
+			    kmalloc(BULK_BUF_SIZE, GFP_KERNEL);
+			if (!upriv->read_urb->transfer_buffer) {
+				err("Couldn't allocate IN buffer");
+				goto error;
+			}
+		}
+
+		if (((ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
+		     == USB_DIR_OUT) &&
+		    ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
+		     == USB_ENDPOINT_XFER_BULK)) {
+			/* we found a bulk out endpoint */
+			if (upriv->bap_buf != NULL) {
+				pr_warning("Found a second bulk out ep, ignored");
+				continue;
+			}
+
+			if (le16_to_cpu(ep->wMaxPacketSize) != 64)
+				pr_warning("bulk out: wMaxPacketSize != 64");
+			if (ep->bEndpointAddress != 2)
+				pr_warning("bulk out: bEndpointAddress: %d",
+				     ep->bEndpointAddress);
+			upriv->write_pipe = usb_sndbulkpipe(udev,
+							  ep->
+							  bEndpointAddress);
+			upriv->bap_buf = kmalloc(BULK_BUF_SIZE, GFP_KERNEL);
+			if (!upriv->bap_buf) {
+				err("Couldn't allocate bulk_out_buffer");
+				goto error;
+			}
+		}
+	}
+	if (!upriv->bap_buf || !upriv->read_urb) {
+		err("Didn't find the required bulk endpoints");
+		goto error;
+	}
+
+	if (request_firmware(&fw_entry, "orinoco_ezusb_fw",
+			     &interface->dev) == 0) {
+		firmware.size = fw_entry->size;
+		firmware.code = fw_entry->data;
+	}
+	if (firmware.size && firmware.code) {
+		ezusb_firmware_download(upriv, &firmware);
+	} else {
+		err("No firmware to download");
+		goto error;
+	}
+
+	if (ezusb_hard_reset(priv) < 0) {
+		err("Cannot reset the device");
+		goto error;
+	}
+
+	/* If the firmware is already downloaded orinoco.c will call
+	 * ezusb_init but if the firmware is not already there, that will make
+	 * the kernel very unstable, so we try initializing here and quit in
+	 * case of error */
+	if (ezusb_init(hw) < 0) {
+		err("Couldn't initialize the device");
+		err("Firmware may not be downloaded or may be wrong.");
+		goto error;
+	}
+
+	/* Initialise the main driver */
+	if (orinoco_init(priv) != 0) {
+		err("orinoco_init() failed\n");
+		goto error;
+	}
+
+	if (orinoco_if_add(priv, 0, 0, &ezusb_netdev_ops) != 0) {
+		upriv->dev = NULL;
+		err("%s: orinoco_if_add() failed", __func__);
+		goto error;
+	}
+	upriv->dev = priv->ndev;
+
+	goto exit;
+
+ error:
+	ezusb_delete(upriv);
+	if (upriv->dev) {
+		/* upriv->dev was 0, so ezusb_delete() didn't free it */
+		free_orinocodev(priv);
+	}
+	upriv = NULL;
+	retval = -EFAULT;
+ exit:
+	if (fw_entry) {
+		firmware.code = NULL;
+		firmware.size = 0;
+		release_firmware(fw_entry);
+	}
+	usb_set_intfdata(interface, upriv);
+	return retval;
+}
+
+
+static void ezusb_disconnect(struct usb_interface *intf)
+{
+	struct ezusb_priv *upriv = usb_get_intfdata(intf);
+	usb_set_intfdata(intf, NULL);
+	ezusb_delete(upriv);
+	printk(KERN_INFO PFX "Disconnected\n");
+}
+
+
+/* usb specific object needed to register this driver with the usb subsystem */
+static struct usb_driver orinoco_driver = {
+	.name = DRIVER_NAME,
+	.probe = ezusb_probe,
+	.disconnect = ezusb_disconnect,
+	.id_table = ezusb_table,
+};
+
+/* Can't be declared "const" or the whole __initdata section will
+ * become const */
+static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION
+    " (Manuel Estrada Sainz)";
+
+static int __init ezusb_module_init(void)
+{
+	int err;
+
+	printk(KERN_DEBUG "%s\n", version);
+
+	/* register this driver with the USB subsystem */
+	err = usb_register(&orinoco_driver);
+	if (err < 0) {
+		printk(KERN_ERR PFX "usb_register failed, error %d\n",
+		       err);
+		return err;
+	}
+
+	return 0;
+}
+
+static void __exit ezusb_module_exit(void)
+{
+	/* deregister this driver with the USB subsystem */
+	usb_deregister(&orinoco_driver);
+}
+
+
+module_init(ezusb_module_init);
+module_exit(ezusb_module_exit);
+
+MODULE_AUTHOR("Manuel Estrada Sainz");
+MODULE_DESCRIPTION
+    ("Driver for Orinoco wireless LAN cards using EZUSB bridge");
+MODULE_LICENSE("Dual MPL/GPL");