[IrDA]: Kingsun Dazzle IrDA USB driver

This dongle does not follow the usb-irda specification, so it needs its own
special driver. Just like the Kingsun/Donshine dongle, it exposes two
interrupt endpoints. Reception is performed through direct reads from the
input endpoint. Transmission requires splitting the IrDA frames into 8-byte
segments, in which the first byte encodes how many of the remaining 7 bytes
are used as data. Speed change is made with a control URB just like the one
in cypress_m8, and it seems to support up to 115200 bps.

On plugin, this dongle reports vendor and device IDs: 0x07d0:0x4100

Signed-off-by: Alex Villacís Lasso <a_villacis@palosanto.com>
Signed-off-by: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 836 insertions, 0 deletions

diff --git a/drivers/net/irda/Kconfig b/drivers/net/irda/Kconfig
index 2098d0a..cfa7b88 100644
--- a/drivers/net/irda/Kconfig
+++ b/drivers/net/irda/Kconfig
@@ -162,7 +162,19 @@ config EP7211_DONGLE
 	  Say Y here if you want to build support for the Cirrus logic
 	  EP7211 chipset's infrared module.
 
+config KSDAZZLE_DONGLE
+	tristate "KingSun Dazzle IrDA-USB dongle (EXPERIMENTAL)"
+	depends on IRDA && USB && EXPERIMENTAL
+	help
+	  Say Y or M here if you want to build support for the KingSun Dazzle
+	  IrDA-USB bridge device driver.
+
+	  This USB bridge does not conform to the IrDA-USB device class
+	  specification, and therefore needs its own specific driver. This
+	  dongle supports SIR speeds only (9600 through 115200 bps).
 
+	  To compile it as a module, choose M here: the module will be called
+	  ksdazzle-sir.
 
 comment "Old SIR device drivers"
 
diff --git a/drivers/net/irda/Makefile b/drivers/net/irda/Makefile
index 2808ef5..e19da3b 100644
--- a/drivers/net/irda/Makefile
+++ b/drivers/net/irda/Makefile
@@ -47,6 +47,7 @@ obj-$(CONFIG_MA600_DONGLE)	+= ma600-sir.o
 obj-$(CONFIG_TOIM3232_DONGLE)	+= toim3232-sir.o
 obj-$(CONFIG_EP7211_DONGLE)	+= ep7211-sir.o
 obj-$(CONFIG_KINGSUN_DONGLE)	+= kingsun-sir.o
+obj-$(CONFIG_KSDAZZLE_DONGLE)	+= ksdazzle-sir.o
 
 # The SIR helper module
 sir-dev-objs := sir_dev.o sir_dongle.o
diff --git a/drivers/net/irda/ksdazzle-sir.c b/drivers/net/irda/ksdazzle-sir.c
new file mode 100644
index 0000000..12b0e7a
--- /dev/null
+++ b/drivers/net/irda/ksdazzle-sir.c
@@ -0,0 +1,823 @@
+/*****************************************************************************
+*
+* Filename:      ksdazzle.c
+* Version:       0.1.1
+* Description:   Irda KingSun Dazzle USB Dongle
+* Status:        Experimental
+* Author:        Alex Villacís Lasso <a_villacis@palosanto.com>
+*
+*    Based on stir4200, mcs7780, kingsun-sir drivers.
+*
+*    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.
+*
+*    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*
+*****************************************************************************/
+
+/*
+ * Following is my most current (2007-07-26) understanding of how the Kingsun
+ * 07D0:4100 dongle (sometimes known as the MA-660) is supposed to work. This
+ * information was deduced by examining the USB traffic captured with USBSnoopy
+ * from the WinXP driver. Feel free to update here as more of the dongle is
+ * known.
+ *
+ * General: This dongle exposes one interface with two interrupt endpoints, one
+ * IN and one OUT. In this regard, it is similar to what the Kingsun/Donshine
+ * dongle (07c0:4200) exposes. Traffic is raw and needs to be wrapped and
+ * unwrapped manually as in stir4200, kingsun-sir, and ks959-sir.
+ *
+ * Transmission: To transmit an IrDA frame, it is necessary to wrap it, then
+ * split it into multiple segments of up to 7 bytes each, and transmit each in
+ * sequence. It seems that sending a single big block (like kingsun-sir does)
+ * won't work with this dongle. Each segment needs to be prefixed with a value
+ * equal to (unsigned char)0xF8 + <number of bytes in segment>, inside a payload
+ * of exactly 8 bytes. For example, a segment of 1 byte gets prefixed by 0xF9,
+ * and one of 7 bytes gets prefixed by 0xFF. The bytes at the end of the
+ * payload, not considered by the prefix, are ignored (set to 0 by this
+ * implementation).
+ *
+ * Reception: To receive data, the driver must poll the dongle regularly (like
+ * kingsun-sir.c) with interrupt URBs. If data is available, it will be returned
+ * in payloads from 0 to 8 bytes long. When concatenated, these payloads form
+ * a raw IrDA stream that needs to be unwrapped as in stir4200 and kingsun-sir
+ *
+ * Speed change: To change the speed of the dongle, the driver prepares a
+ * control URB with the following as a setup packet:
+ *    bRequestType    USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE
+ *    bRequest        0x09
+ *    wValue          0x0200
+ *    wIndex          0x0001
+ *    wLength         0x0008 (length of the payload)
+ * The payload is a 8-byte record, apparently identical to the one used in
+ * drivers/usb/serial/cypress_m8.c to change speed:
+ *     __u32 baudSpeed;
+ *    unsigned int dataBits : 2;    // 0 - 5 bits 3 - 8 bits
+ *    unsigned int : 1;
+ *    unsigned int stopBits : 1;
+ *    unsigned int parityEnable : 1;
+ *    unsigned int parityType : 1;
+ *    unsigned int : 1;
+ *    unsigned int reset : 1;
+ *    unsigned char reserved[3];    // set to 0
+ *
+ * For now only SIR speeds have been observed with this dongle. Therefore,
+ * nothing is known on what changes (if any) must be done to frame wrapping /
+ * unwrapping for higher than SIR speeds. This driver assumes no change is
+ * necessary and announces support for all the way to 115200 bps.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/kref.h>
+#include <linux/usb.h>
+#include <linux/device.h>
+#include <linux/crc32.h>
+
+#include <asm/unaligned.h>
+#include <asm/byteorder.h>
+#include <asm/uaccess.h>
+
+#include <net/irda/irda.h>
+#include <net/irda/wrapper.h>
+#include <net/irda/crc.h>
+
+#define KSDAZZLE_VENDOR_ID 0x07d0
+#define KSDAZZLE_PRODUCT_ID 0x4100
+
+/* These are the currently known USB ids */
+static struct usb_device_id dongles[] = {
+	/* KingSun Co,Ltd  IrDA/USB Bridge */
+	{USB_DEVICE(KSDAZZLE_VENDOR_ID, KSDAZZLE_PRODUCT_ID)},
+	{}
+};
+
+MODULE_DEVICE_TABLE(usb, dongles);
+
+#define KINGSUN_MTT 0x07
+#define KINGSUN_REQ_RECV 0x01
+#define KINGSUN_REQ_SEND 0x09
+
+#define KINGSUN_SND_FIFO_SIZE    2048	/* Max packet we can send */
+
+struct ksdazzle_speedparams {
+	__le32 baudrate;	/* baud rate, little endian */
+	__u8 flags;
+	__u8 reserved[3];
+} __attribute__ ((packed));
+
+#define KS_DATA_5_BITS 0x00
+#define KS_DATA_6_BITS 0x01
+#define KS_DATA_7_BITS 0x02
+#define KS_DATA_8_BITS 0x03
+
+#define KS_STOP_BITS_1 0x00
+#define KS_STOP_BITS_2 0x08
+
+#define KS_PAR_DISABLE    0x00
+#define KS_PAR_EVEN    0x10
+#define KS_PAR_ODD    0x30
+#define KS_RESET    0x80
+
+#define KINGSUN_EP_IN			0
+#define KINGSUN_EP_OUT			1
+
+struct ksdazzle_cb {
+	struct usb_device *usbdev;	/* init: probe_irda */
+	struct net_device *netdev;	/* network layer */
+	struct irlap_cb *irlap;	/* The link layer we are binded to */
+	struct net_device_stats stats;	/* network statistics */
+	struct qos_info qos;
+
+	struct urb *tx_urb;
+	__u8 *tx_buf_clear;
+	unsigned int tx_buf_clear_used;
+	unsigned int tx_buf_clear_sent;
+	__u8 tx_payload[8];
+
+	struct urb *rx_urb;
+	__u8 rx_payload[8];
+	iobuff_t rx_unwrap_buff;
+
+	struct usb_ctrlrequest *speed_setuprequest;
+	struct urb *speed_urb;
+	struct ksdazzle_speedparams speedparams;
+	unsigned int new_speed;
+
+	__u8 ep_in;
+	__u8 ep_out;
+
+	spinlock_t lock;
+	int receiving;
+};
+
+/* Callback transmission routine */
+static void ksdazzle_speed_irq(struct urb *urb)
+{
+	/* unlink, shutdown, unplug, other nasties */
+	if (urb->status != 0) {
+		err("ksdazzle_speed_irq: urb asynchronously failed - %d",
+		    urb->status);
+	}
+}
+
+/* Send a control request to change speed of the dongle */
+static int ksdazzle_change_speed(struct ksdazzle_cb *kingsun, unsigned speed)
+{
+	static unsigned int supported_speeds[] = { 2400, 9600, 19200, 38400,
+		57600, 115200, 576000, 1152000, 4000000, 0
+	};
+	int err;
+	unsigned int i;
+
+	if (kingsun->speed_setuprequest == NULL || kingsun->speed_urb == NULL)
+		return -ENOMEM;
+
+	/* Check that requested speed is among the supported ones */
+	for (i = 0; supported_speeds[i] && supported_speeds[i] != speed; i++) ;
+	if (supported_speeds[i] == 0)
+		return -EOPNOTSUPP;
+
+	memset(&(kingsun->speedparams), 0, sizeof(struct ksdazzle_speedparams));
+	kingsun->speedparams.baudrate = cpu_to_le32(speed);
+	kingsun->speedparams.flags = KS_DATA_8_BITS;
+
+	/* speed_setuprequest pre-filled in ksdazzle_probe */
+	usb_fill_control_urb(kingsun->speed_urb, kingsun->usbdev,
+			     usb_sndctrlpipe(kingsun->usbdev, 0),
+			     (unsigned char *)kingsun->speed_setuprequest,
+			     &(kingsun->speedparams),
+			     sizeof(struct ksdazzle_speedparams),
+			     ksdazzle_speed_irq, kingsun);
+	kingsun->speed_urb->status = 0;
+	err = usb_submit_urb(kingsun->speed_urb, GFP_ATOMIC);
+
+	return err;
+}
+
+/* Submit one fragment of an IrDA frame to the dongle */
+static void ksdazzle_send_irq(struct urb *urb);
+static int ksdazzle_submit_tx_fragment(struct ksdazzle_cb *kingsun)
+{
+	unsigned int wraplen;
+	int ret;
+
+	/* We can send at most 7 bytes of payload at a time */
+	wraplen = 7;
+	if (wraplen > kingsun->tx_buf_clear_used)
+		wraplen = kingsun->tx_buf_clear_used;
+
+	/* Prepare payload prefix with used length */
+	memset(kingsun->tx_payload, 0, 8);
+	kingsun->tx_payload[0] = (unsigned char)0xf8 + wraplen;
+	memcpy(kingsun->tx_payload + 1, kingsun->tx_buf_clear, wraplen);
+
+	usb_fill_int_urb(kingsun->tx_urb, kingsun->usbdev,
+			 usb_sndintpipe(kingsun->usbdev, kingsun->ep_out),
+			 kingsun->tx_payload, 8, ksdazzle_send_irq, kingsun, 1);
+	kingsun->tx_urb->status = 0;
+	ret = usb_submit_urb(kingsun->tx_urb, GFP_ATOMIC);
+
+	/* Remember how much data was sent, in order to update at callback */
+	kingsun->tx_buf_clear_sent = (ret == 0) ? wraplen : 0;
+	return ret;
+}
+
+/* Callback transmission routine */
+static void ksdazzle_send_irq(struct urb *urb)
+{
+	struct ksdazzle_cb *kingsun = urb->context;
+	struct net_device *netdev = kingsun->netdev;
+	int ret = 0;
+
+	/* in process of stopping, just drop data */
+	if (!netif_running(kingsun->netdev)) {
+		err("ksdazzle_send_irq: Network not running!");
+		return;
+	}
+
+	/* unlink, shutdown, unplug, other nasties */
+	if (urb->status != 0) {
+		err("ksdazzle_send_irq: urb asynchronously failed - %d",
+		    urb->status);
+		return;
+	}
+
+	if (kingsun->tx_buf_clear_used > 0) {
+		/* Update data remaining to be sent */
+		if (kingsun->tx_buf_clear_sent < kingsun->tx_buf_clear_used) {
+			memmove(kingsun->tx_buf_clear,
+				kingsun->tx_buf_clear +
+				kingsun->tx_buf_clear_sent,
+				kingsun->tx_buf_clear_used -
+				kingsun->tx_buf_clear_sent);
+		}
+		kingsun->tx_buf_clear_used -= kingsun->tx_buf_clear_sent;
+		kingsun->tx_buf_clear_sent = 0;
+
+		if (kingsun->tx_buf_clear_used > 0) {
+			/* There is more data to be sent */
+			if ((ret = ksdazzle_submit_tx_fragment(kingsun)) != 0) {
+				err("ksdazzle_send_irq: failed tx_urb submit: %d", ret);
+				switch (ret) {
+				case -ENODEV:
+				case -EPIPE:
+					break;
+				default:
+					kingsun->stats.tx_errors++;
+					netif_start_queue(netdev);
+				}
+			}
+		} else {
+			/* All data sent, send next speed && wake network queue */
+			if (kingsun->new_speed != -1 &&
+			    cpu_to_le32(kingsun->new_speed) !=
+			    kingsun->speedparams.baudrate)
+				ksdazzle_change_speed(kingsun,
+						      kingsun->new_speed);
+
+			netif_wake_queue(netdev);
+		}
+	}
+}
+
+/*
+ * Called from net/core when new frame is available.
+ */
+static int ksdazzle_hard_xmit(struct sk_buff *skb, struct net_device *netdev)
+{
+	struct ksdazzle_cb *kingsun;
+	unsigned int wraplen;
+	int ret = 0;
+
+	if (skb == NULL || netdev == NULL)
+		return -EINVAL;
+
+	netif_stop_queue(netdev);
+
+	/* the IRDA wrapping routines don't deal with non linear skb */
+	SKB_LINEAR_ASSERT(skb);
+
+	kingsun = netdev_priv(netdev);
+
+	spin_lock(&kingsun->lock);
+	kingsun->new_speed = irda_get_next_speed(skb);
+
+	/* Append data to the end of whatever data remains to be transmitted */
+	wraplen =
+	    async_wrap_skb(skb, kingsun->tx_buf_clear, KINGSUN_SND_FIFO_SIZE);
+	kingsun->tx_buf_clear_used = wraplen;
+
+	if ((ret = ksdazzle_submit_tx_fragment(kingsun)) != 0) {
+		err("ksdazzle_hard_xmit: failed tx_urb submit: %d", ret);
+		switch (ret) {
+		case -ENODEV:
+		case -EPIPE:
+			break;
+		default:
+			kingsun->stats.tx_errors++;
+			netif_start_queue(netdev);
+		}
+	} else {
+		kingsun->stats.tx_packets++;
+		kingsun->stats.tx_bytes += skb->len;
+
+	}
+
+	dev_kfree_skb(skb);
+	spin_unlock(&kingsun->lock);
+
+	return ret;
+}
+
+/* Receive callback function */
+static void ksdazzle_rcv_irq(struct urb *urb)
+{
+	struct ksdazzle_cb *kingsun = urb->context;
+
+	/* in process of stopping, just drop data */
+	if (!netif_running(kingsun->netdev)) {
+		kingsun->receiving = 0;
+		return;
+	}
+
+	/* unlink, shutdown, unplug, other nasties */
+	if (urb->status != 0) {
+		err("ksdazzle_rcv_irq: urb asynchronously failed - %d",
+		    urb->status);
+		kingsun->receiving = 0;
+		return;
+	}
+
+	if (urb->actual_length > 0) {
+		__u8 *bytes = urb->transfer_buffer;
+		unsigned int i;
+
+		for (i = 0; i < urb->actual_length; i++) {
+			async_unwrap_char(kingsun->netdev, &kingsun->stats,
+					  &kingsun->rx_unwrap_buff, bytes[i]);
+		}
+		kingsun->netdev->last_rx = jiffies;
+		kingsun->receiving =
+		    (kingsun->rx_unwrap_buff.state != OUTSIDE_FRAME) ? 1 : 0;
+	}
+
+	/* This urb has already been filled in ksdazzle_net_open. It is assumed that
+	   urb keeps the pointer to the payload buffer.
+	 */
+	urb->status = 0;
+	usb_submit_urb(urb, GFP_ATOMIC);
+}
+
+/*
+ * Function ksdazzle_net_open (dev)
+ *
+ *    Network device is taken up. Usually this is done by "ifconfig irda0 up"
+ */
+static int ksdazzle_net_open(struct net_device *netdev)
+{
+	struct ksdazzle_cb *kingsun = netdev_priv(netdev);
+	int err = -ENOMEM;
+	char hwname[16];
+
+	/* At this point, urbs are NULL, and skb is NULL (see ksdazzle_probe) */
+	kingsun->receiving = 0;
+
+	/* Initialize for SIR to copy data directly into skb.  */
+	kingsun->rx_unwrap_buff.in_frame = FALSE;
+	kingsun->rx_unwrap_buff.state = OUTSIDE_FRAME;
+	kingsun->rx_unwrap_buff.truesize = IRDA_SKB_MAX_MTU;
+	kingsun->rx_unwrap_buff.skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
+	if (!kingsun->rx_unwrap_buff.skb)
+		goto free_mem;
+
+	skb_reserve(kingsun->rx_unwrap_buff.skb, 1);
+	kingsun->rx_unwrap_buff.head = kingsun->rx_unwrap_buff.skb->data;
+
+	kingsun->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!kingsun->rx_urb)
+		goto free_mem;
+
+	kingsun->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!kingsun->tx_urb)
+		goto free_mem;
+
+	kingsun->speed_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!kingsun->speed_urb)
+		goto free_mem;
+
+	/* Initialize speed for dongle */
+	kingsun->new_speed = 9600;
+	err = ksdazzle_change_speed(kingsun, 9600);
+	if (err < 0)
+		goto free_mem;
+
+	/*
+	 * Now that everything should be initialized properly,
+	 * Open new IrLAP layer instance to take care of us...
+	 */
+	sprintf(hwname, "usb#%d", kingsun->usbdev->devnum);
+	kingsun->irlap = irlap_open(netdev, &kingsun->qos, hwname);
+	if (!kingsun->irlap) {
+		err("ksdazzle-sir: irlap_open failed");
+		goto free_mem;
+	}
+
+	/* Start reception. */
+	usb_fill_int_urb(kingsun->rx_urb, kingsun->usbdev,
+			 usb_rcvintpipe(kingsun->usbdev, kingsun->ep_in),
+			 kingsun->rx_payload, 8, ksdazzle_rcv_irq, kingsun, 1);
+	kingsun->rx_urb->status = 0;
+	err = usb_submit_urb(kingsun->rx_urb, GFP_KERNEL);
+	if (err) {
+		err("ksdazzle-sir: first urb-submit failed: %d", err);
+		goto close_irlap;
+	}
+
+	netif_start_queue(netdev);
+
+	/* Situation at this point:
+	   - all work buffers allocated
+	   - urbs allocated and ready to fill
+	   - max rx packet known (in max_rx)
+	   - unwrap state machine initialized, in state outside of any frame
+	   - receive request in progress
+	   - IrLAP layer started, about to hand over packets to send
+	 */
+
+	return 0;
+
+      close_irlap:
+	irlap_close(kingsun->irlap);
+      free_mem:
+	usb_free_urb(kingsun->speed_urb);
+	kingsun->speed_urb = NULL;
+	usb_free_urb(kingsun->tx_urb);
+	kingsun->tx_urb = NULL;
+	usb_free_urb(kingsun->rx_urb);
+	kingsun->rx_urb = NULL;
+	if (kingsun->rx_unwrap_buff.skb) {
+		kfree_skb(kingsun->rx_unwrap_buff.skb);
+		kingsun->rx_unwrap_buff.skb = NULL;
+		kingsun->rx_unwrap_buff.head = NULL;
+	}
+	return err;
+}
+
+/*
+ * Function ksdazzle_net_close (dev)
+ *
+ *    Network device is taken down. Usually this is done by
+ *    "ifconfig irda0 down"
+ */
+static int ksdazzle_net_close(struct net_device *netdev)
+{
+	struct ksdazzle_cb *kingsun = netdev_priv(netdev);
+
+	/* Stop transmit processing */
+	netif_stop_queue(netdev);
+
+	/* Mop up receive && transmit urb's */
+	usb_kill_urb(kingsun->tx_urb);
+	usb_free_urb(kingsun->tx_urb);
+	kingsun->tx_urb = NULL;
+
+	usb_kill_urb(kingsun->speed_urb);
+	usb_free_urb(kingsun->speed_urb);
+	kingsun->speed_urb = NULL;
+
+	usb_kill_urb(kingsun->rx_urb);
+	usb_free_urb(kingsun->rx_urb);
+	kingsun->rx_urb = NULL;
+
+	kfree_skb(kingsun->rx_unwrap_buff.skb);
+	kingsun->rx_unwrap_buff.skb = NULL;
+	kingsun->rx_unwrap_buff.head = NULL;
+	kingsun->rx_unwrap_buff.in_frame = FALSE;
+	kingsun->rx_unwrap_buff.state = OUTSIDE_FRAME;
+	kingsun->receiving = 0;
+
+	/* Stop and remove instance of IrLAP */
+	irlap_close(kingsun->irlap);
+
+	kingsun->irlap = NULL;
+
+	return 0;
+}
+
+/*
+ * IOCTLs : Extra out-of-band network commands...
+ */
+static int ksdazzle_net_ioctl(struct net_device *netdev, struct ifreq *rq,
+			      int cmd)
+{
+	struct if_irda_req *irq = (struct if_irda_req *)rq;
+	struct ksdazzle_cb *kingsun = netdev_priv(netdev);
+	int ret = 0;
+
+	switch (cmd) {
+	case SIOCSBANDWIDTH:	/* Set bandwidth */
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		/* Check if the device is still there */
+		if (netif_device_present(kingsun->netdev))
+			return ksdazzle_change_speed(kingsun,
+						     irq->ifr_baudrate);
+		break;
+
+	case SIOCSMEDIABUSY:	/* Set media busy */
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		/* Check if the IrDA stack is still there */
+		if (netif_running(kingsun->netdev))
+			irda_device_set_media_busy(kingsun->netdev, TRUE);
+		break;
+
+	case SIOCGRECEIVING:
+		/* Only approximately true */
+		irq->ifr_receiving = kingsun->receiving;
+		break;
+
+	default:
+		ret = -EOPNOTSUPP;
+	}
+
+	return ret;
+}
+
+/*
+ * Get device stats (for /proc/net/dev and ifconfig)
+ */
+static struct net_device_stats *ksdazzle_net_get_stats(struct net_device
+						       *netdev)
+{
+	struct ksdazzle_cb *kingsun = netdev_priv(netdev);
+	return &kingsun->stats;
+}
+
+/*
+ * This routine is called by the USB subsystem for each new device
+ * in the system. We need to check if the device is ours, and in
+ * this case start handling it.
+ */
+static int ksdazzle_probe(struct usb_interface *intf,
+			  const struct usb_device_id *id)
+{
+	struct usb_host_interface *interface;
+	struct usb_endpoint_descriptor *endpoint;
+
+	struct usb_device *dev = interface_to_usbdev(intf);
+	struct ksdazzle_cb *kingsun = NULL;
+	struct net_device *net = NULL;
+	int ret = -ENOMEM;
+	int pipe, maxp_in, maxp_out;
+	__u8 ep_in;
+	__u8 ep_out;
+
+	/* Check that there really are two interrupt endpoints. Check based on the
+	   one in drivers/usb/input/usbmouse.c
+	 */
+	interface = intf->cur_altsetting;
+	if (interface->desc.bNumEndpoints != 2) {
+		err("ksdazzle: expected 2 endpoints, found %d",
+		    interface->desc.bNumEndpoints);
+		return -ENODEV;
+	}
+	endpoint = &interface->endpoint[KINGSUN_EP_IN].desc;
+	if (!usb_endpoint_is_int_in(endpoint)) {
+		err("ksdazzle: endpoint 0 is not interrupt IN");
+		return -ENODEV;
+	}
+
+	ep_in = endpoint->bEndpointAddress;
+	pipe = usb_rcvintpipe(dev, ep_in);
+	maxp_in = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
+	if (maxp_in > 255 || maxp_in <= 1) {
+		err("ksdazzle: endpoint 0 has max packet size %d not in range [2..255]", maxp_in);
+		return -ENODEV;
+	}
+
+	endpoint = &interface->endpoint[KINGSUN_EP_OUT].desc;
+	if (!usb_endpoint_is_int_out(endpoint)) {
+		err("ksdazzle: endpoint 1 is not interrupt OUT");
+		return -ENODEV;
+	}
+
+	ep_out = endpoint->bEndpointAddress;
+	pipe = usb_sndintpipe(dev, ep_out);
+	maxp_out = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
+
+	/* Allocate network device container. */
+	net = alloc_irdadev(sizeof(*kingsun));
+	if (!net)
+		goto err_out1;
+
+	SET_MODULE_OWNER(net);
+	SET_NETDEV_DEV(net, &intf->dev);
+	kingsun = netdev_priv(net);
+	kingsun->netdev = net;
+	kingsun->usbdev = dev;
+	kingsun->ep_in = ep_in;
+	kingsun->ep_out = ep_out;
+	kingsun->irlap = NULL;
+	kingsun->tx_urb = NULL;
+	kingsun->tx_buf_clear = NULL;
+	kingsun->tx_buf_clear_used = 0;
+	kingsun->tx_buf_clear_sent = 0;
+
+	kingsun->rx_urb = NULL;
+	kingsun->rx_unwrap_buff.in_frame = FALSE;
+	kingsun->rx_unwrap_buff.state = OUTSIDE_FRAME;
+	kingsun->rx_unwrap_buff.skb = NULL;
+	kingsun->receiving = 0;
+	spin_lock_init(&kingsun->lock);
+
+	kingsun->speed_setuprequest = NULL;
+	kingsun->speed_urb = NULL;
+	kingsun->speedparams.baudrate = 0;
+
+	/* Allocate output buffer */
+	kingsun->tx_buf_clear = kmalloc(KINGSUN_SND_FIFO_SIZE, GFP_KERNEL);
+	if (!kingsun->tx_buf_clear)
+		goto free_mem;
+
+	/* Allocate and initialize speed setup packet */
+	kingsun->speed_setuprequest =
+	    kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
+	if (!kingsun->speed_setuprequest)
+		goto free_mem;
+	kingsun->speed_setuprequest->bRequestType =
+	    USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
+	kingsun->speed_setuprequest->bRequest = KINGSUN_REQ_SEND;
+	kingsun->speed_setuprequest->wValue = cpu_to_le16(0x0200);
+	kingsun->speed_setuprequest->wIndex = cpu_to_le16(0x0001);
+	kingsun->speed_setuprequest->wLength =
+	    cpu_to_le16(sizeof(struct ksdazzle_speedparams));
+
+	printk(KERN_INFO "KingSun/Dazzle IRDA/USB found at address %d, "
+	       "Vendor: %x, Product: %x\n",
+	       dev->devnum, le16_to_cpu(dev->descriptor.idVendor),
+	       le16_to_cpu(dev->descriptor.idProduct));
+
+	/* Initialize QoS for this device */
+	irda_init_max_qos_capabilies(&kingsun->qos);
+
+	/* Baud rates known to be supported. Please uncomment if devices (other
+	   than a SonyEriccson K300 phone) can be shown to support higher speeds
+	   with this dongle.
+	 */
+	kingsun->qos.baud_rate.bits =
+	    IR_2400 | IR_9600 | IR_19200 | IR_38400 | IR_57600 | IR_115200;
+	kingsun->qos.min_turn_time.bits &= KINGSUN_MTT;
+	irda_qos_bits_to_value(&kingsun->qos);
+
+	/* Override the network functions we need to use */
+	net->hard_start_xmit = ksdazzle_hard_xmit;
+	net->open = ksdazzle_net_open;
+	net->stop = ksdazzle_net_close;
+	net->get_stats = ksdazzle_net_get_stats;
+	net->do_ioctl = ksdazzle_net_ioctl;
+
+	ret = register_netdev(net);
+	if (ret != 0)
+		goto free_mem;
+
+	info("IrDA: Registered KingSun/Dazzle device %s", net->name);
+
+	usb_set_intfdata(intf, kingsun);
+
+	/* Situation at this point:
+	   - all work buffers allocated
+	   - setup requests pre-filled
+	   - urbs not allocated, set to NULL
+	   - max rx packet known (is KINGSUN_FIFO_SIZE)
+	   - unwrap state machine (partially) initialized, but skb == NULL
+	 */
+
+	return 0;
+
+      free_mem:
+	kfree(kingsun->speed_setuprequest);
+	kfree(kingsun->tx_buf_clear);
+	free_netdev(net);
+      err_out1:
+	return ret;
+}
+
+/*
+ * The current device is removed, the USB layer tell us to shut it down...
+ */
+static void ksdazzle_disconnect(struct usb_interface *intf)
+{
+	struct ksdazzle_cb *kingsun = usb_get_intfdata(intf);
+
+	if (!kingsun)
+		return;
+
+	unregister_netdev(kingsun->netdev);
+
+	/* Mop up receive && transmit urb's */
+	usb_kill_urb(kingsun->speed_urb);
+	usb_free_urb(kingsun->speed_urb);
+	kingsun->speed_urb = NULL;
+
+	usb_kill_urb(kingsun->tx_urb);
+	usb_free_urb(kingsun->tx_urb);
+	kingsun->tx_urb = NULL;
+
+	usb_kill_urb(kingsun->rx_urb);
+	usb_free_urb(kingsun->rx_urb);
+	kingsun->rx_urb = NULL;
+
+	kfree(kingsun->speed_setuprequest);
+	kfree(kingsun->tx_buf_clear);
+	free_netdev(kingsun->netdev);
+
+	usb_set_intfdata(intf, NULL);
+}
+
+#ifdef CONFIG_PM
+/* USB suspend, so power off the transmitter/receiver */
+static int ksdazzle_suspend(struct usb_interface *intf, pm_message_t message)
+{
+	struct ksdazzle_cb *kingsun = usb_get_intfdata(intf);
+
+	netif_device_detach(kingsun->netdev);
+	if (kingsun->speed_urb != NULL)
+		usb_kill_urb(kingsun->speed_urb);
+	if (kingsun->tx_urb != NULL)
+		usb_kill_urb(kingsun->tx_urb);
+	if (kingsun->rx_urb != NULL)
+		usb_kill_urb(kingsun->rx_urb);
+	return 0;
+}
+
+/* Coming out of suspend, so reset hardware */
+static int ksdazzle_resume(struct usb_interface *intf)
+{
+	struct ksdazzle_cb *kingsun = usb_get_intfdata(intf);
+
+	if (kingsun->rx_urb != NULL) {
+		/* Setup request already filled in ksdazzle_probe */
+		usb_submit_urb(kingsun->rx_urb, GFP_KERNEL);
+	}
+	netif_device_attach(kingsun->netdev);
+
+	return 0;
+}
+#endif
+
+/*
+ * USB device callbacks
+ */
+static struct usb_driver irda_driver = {
+	.name = "ksdazzle-sir",
+	.probe = ksdazzle_probe,
+	.disconnect = ksdazzle_disconnect,
+	.id_table = dongles,
+#ifdef CONFIG_PM
+	.suspend = ksdazzle_suspend,
+	.resume = ksdazzle_resume,
+#endif
+};
+
+/*
+ * Module insertion
+ */
+static int __init ksdazzle_init(void)
+{
+	return usb_register(&irda_driver);
+}
+
+module_init(ksdazzle_init);
+
+/*
+ * Module removal
+ */
+static void __exit ksdazzle_cleanup(void)
+{
+	/* Deregister the driver and remove all pending instances */
+	usb_deregister(&irda_driver);
+}
+
+module_exit(ksdazzle_cleanup);
+
+MODULE_AUTHOR("Alex Villacís Lasso <a_villacis@palosanto.com>");
+MODULE_DESCRIPTION("IrDA-USB Dongle Driver for KingSun Dazzle");
+MODULE_LICENSE("GPL");