Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3314 insertions, 0 deletions

diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
new file mode 100644
index 0000000000..83b8452220
--- /dev/null
+++ b/drivers/net/usb/hso.c
@@ -0,0 +1,3314 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/******************************************************************************
+ *
+ * Driver for Option High Speed Mobile Devices.
+ *
+ *  Copyright (C) 2008 Option International
+ *                     Filip Aben <f.aben@option.com>
+ *                     Denis Joseph Barrow <d.barow@option.com>
+ *                     Jan Dumon <j.dumon@option.com>
+ *  Copyright (C) 2007 Andrew Bird (Sphere Systems Ltd)
+ *  			<ajb@spheresystems.co.uk>
+ *  Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
+ *  Copyright (C) 2008 Novell, Inc.
+ *
+ *****************************************************************************/
+
+/******************************************************************************
+ *
+ * Description of the device:
+ *
+ * Interface 0:	Contains the IP network interface on the bulk end points.
+ *		The multiplexed serial ports are using the interrupt and
+ *		control endpoints.
+ *		Interrupt contains a bitmap telling which multiplexed
+ *		serialport needs servicing.
+ *
+ * Interface 1:	Diagnostics port, uses bulk only, do not submit urbs until the
+ *		port is opened, as this have a huge impact on the network port
+ *		throughput.
+ *
+ * Interface 2:	Standard modem interface - circuit switched interface, this
+ *		can be used to make a standard ppp connection however it
+ *              should not be used in conjunction with the IP network interface
+ *              enabled for USB performance reasons i.e. if using this set
+ *              ideally disable_net=1.
+ *
+ *****************************************************************************/
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/sched/signal.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/module.h>
+#include <linux/ethtool.h>
+#include <linux/usb.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/kmod.h>
+#include <linux/rfkill.h>
+#include <linux/ip.h>
+#include <linux/uaccess.h>
+#include <linux/usb/cdc.h>
+#include <net/arp.h>
+#include <asm/byteorder.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+
+
+#define MOD_AUTHOR			"Option Wireless"
+#define MOD_DESCRIPTION			"USB High Speed Option driver"
+
+#define HSO_MAX_NET_DEVICES		10
+#define HSO__MAX_MTU			2048
+#define DEFAULT_MTU			1500
+#define DEFAULT_MRU			1500
+
+#define CTRL_URB_RX_SIZE		1024
+#define CTRL_URB_TX_SIZE		64
+
+#define BULK_URB_RX_SIZE		4096
+#define BULK_URB_TX_SIZE		8192
+
+#define MUX_BULK_RX_BUF_SIZE		HSO__MAX_MTU
+#define MUX_BULK_TX_BUF_SIZE		HSO__MAX_MTU
+#define MUX_BULK_RX_BUF_COUNT		4
+#define USB_TYPE_OPTION_VENDOR		0x20
+
+/* These definitions are used with the struct hso_net flags element */
+/* - use *_bit operations on it. (bit indices not values.) */
+#define HSO_NET_RUNNING			0
+
+#define	HSO_NET_TX_TIMEOUT		(HZ*10)
+
+#define HSO_SERIAL_MAGIC		0x48534f31
+
+/* Number of ttys to handle */
+#define HSO_SERIAL_TTY_MINORS		256
+
+#define MAX_RX_URBS			2
+
+/*****************************************************************************/
+/* Debugging functions                                                       */
+/*****************************************************************************/
+#define hso_dbg(lvl, fmt, ...)						\
+do {									\
+	if ((lvl) & debug)						\
+		pr_info("[%d:%s] " fmt,					\
+			__LINE__, __func__, ##__VA_ARGS__);		\
+} while (0)
+
+/*****************************************************************************/
+/* Enumerators                                                               */
+/*****************************************************************************/
+enum pkt_parse_state {
+	WAIT_IP,
+	WAIT_DATA,
+	WAIT_SYNC
+};
+
+/*****************************************************************************/
+/* Structs                                                                   */
+/*****************************************************************************/
+
+struct hso_shared_int {
+	struct usb_endpoint_descriptor *intr_endp;
+	void *shared_intr_buf;
+	struct urb *shared_intr_urb;
+	struct usb_device *usb;
+	int use_count;
+	int ref_count;
+	struct mutex shared_int_lock;
+};
+
+struct hso_net {
+	struct hso_device *parent;
+	struct net_device *net;
+	struct rfkill *rfkill;
+	char name[24];
+
+	struct usb_endpoint_descriptor *in_endp;
+	struct usb_endpoint_descriptor *out_endp;
+
+	struct urb *mux_bulk_rx_urb_pool[MUX_BULK_RX_BUF_COUNT];
+	struct urb *mux_bulk_tx_urb;
+	void *mux_bulk_rx_buf_pool[MUX_BULK_RX_BUF_COUNT];
+	void *mux_bulk_tx_buf;
+
+	struct sk_buff *skb_rx_buf;
+	struct sk_buff *skb_tx_buf;
+
+	enum pkt_parse_state rx_parse_state;
+	spinlock_t net_lock;
+
+	unsigned short rx_buf_size;
+	unsigned short rx_buf_missing;
+	struct iphdr rx_ip_hdr;
+
+	unsigned long flags;
+};
+
+enum rx_ctrl_state{
+	RX_IDLE,
+	RX_SENT,
+	RX_PENDING
+};
+
+#define BM_REQUEST_TYPE (0xa1)
+#define B_NOTIFICATION  (0x20)
+#define W_VALUE         (0x0)
+#define W_LENGTH        (0x2)
+
+#define B_OVERRUN       (0x1<<6)
+#define B_PARITY        (0x1<<5)
+#define B_FRAMING       (0x1<<4)
+#define B_RING_SIGNAL   (0x1<<3)
+#define B_BREAK         (0x1<<2)
+#define B_TX_CARRIER    (0x1<<1)
+#define B_RX_CARRIER    (0x1<<0)
+
+struct hso_serial_state_notification {
+	u8 bmRequestType;
+	u8 bNotification;
+	u16 wValue;
+	u16 wIndex;
+	u16 wLength;
+	u16 UART_state_bitmap;
+} __packed;
+
+struct hso_tiocmget {
+	struct mutex mutex;
+	wait_queue_head_t waitq;
+	int    intr_completed;
+	struct usb_endpoint_descriptor *endp;
+	struct urb *urb;
+	struct hso_serial_state_notification *serial_state_notification;
+	u16    prev_UART_state_bitmap;
+	struct uart_icount icount;
+};
+
+
+struct hso_serial {
+	struct hso_device *parent;
+	int magic;
+	u8 minor;
+
+	struct hso_shared_int *shared_int;
+
+	/* rx/tx urb could be either a bulk urb or a control urb depending
+	   on which serial port it is used on. */
+	struct urb *rx_urb[MAX_RX_URBS];
+	u8 num_rx_urbs;
+	u8 *rx_data[MAX_RX_URBS];
+	u16 rx_data_length;	/* should contain allocated length */
+
+	struct urb *tx_urb;
+	u8 *tx_data;
+	u8 *tx_buffer;
+	u16 tx_data_length;	/* should contain allocated length */
+	u16 tx_data_count;
+	u16 tx_buffer_count;
+	struct usb_ctrlrequest ctrl_req_tx;
+	struct usb_ctrlrequest ctrl_req_rx;
+
+	struct usb_endpoint_descriptor *in_endp;
+	struct usb_endpoint_descriptor *out_endp;
+
+	enum rx_ctrl_state rx_state;
+	u8 rts_state;
+	u8 dtr_state;
+	unsigned tx_urb_used:1;
+
+	struct tty_port port;
+	/* from usb_serial_port */
+	spinlock_t serial_lock;
+
+	int (*write_data) (struct hso_serial *serial);
+	struct hso_tiocmget  *tiocmget;
+	/* Hacks required to get flow control
+	 * working on the serial receive buffers
+	 * so as not to drop characters on the floor.
+	 */
+	int  curr_rx_urb_idx;
+	u8   rx_urb_filled[MAX_RX_URBS];
+	struct tasklet_struct unthrottle_tasklet;
+};
+
+struct hso_device {
+	union {
+		struct hso_serial *dev_serial;
+		struct hso_net *dev_net;
+	} port_data;
+
+	u32 port_spec;
+
+	u8 is_active;
+	u8 usb_gone;
+	struct work_struct async_get_intf;
+	struct work_struct async_put_intf;
+
+	struct usb_device *usb;
+	struct usb_interface *interface;
+
+	struct device *dev;
+	struct kref ref;
+	struct mutex mutex;
+};
+
+/* Type of interface */
+#define HSO_INTF_MASK		0xFF00
+#define	HSO_INTF_MUX		0x0100
+#define	HSO_INTF_BULK   	0x0200
+
+/* Type of port */
+#define HSO_PORT_MASK		0xFF
+#define HSO_PORT_NO_PORT	0x0
+#define	HSO_PORT_CONTROL	0x1
+#define	HSO_PORT_APP		0x2
+#define	HSO_PORT_GPS		0x3
+#define	HSO_PORT_PCSC		0x4
+#define	HSO_PORT_APP2		0x5
+#define HSO_PORT_GPS_CONTROL	0x6
+#define HSO_PORT_MSD		0x7
+#define HSO_PORT_VOICE		0x8
+#define HSO_PORT_DIAG2		0x9
+#define	HSO_PORT_DIAG		0x10
+#define	HSO_PORT_MODEM		0x11
+#define	HSO_PORT_NETWORK	0x12
+
+/* Additional device info */
+#define HSO_INFO_MASK		0xFF000000
+#define HSO_INFO_CRC_BUG	0x01000000
+
+/*****************************************************************************/
+/* Prototypes                                                                */
+/*****************************************************************************/
+/* Serial driver functions */
+static int hso_serial_tiocmset(struct tty_struct *tty,
+			       unsigned int set, unsigned int clear);
+static void ctrl_callback(struct urb *urb);
+static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial);
+static void hso_kick_transmit(struct hso_serial *serial);
+/* Helper functions */
+static int hso_mux_submit_intr_urb(struct hso_shared_int *mux_int,
+				   struct usb_device *usb, gfp_t gfp);
+static void handle_usb_error(int status, const char *function,
+			     struct hso_device *hso_dev);
+static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
+						  int type, int dir);
+static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports);
+static void hso_free_interface(struct usb_interface *intf);
+static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags);
+static int hso_stop_serial_device(struct hso_device *hso_dev);
+static int hso_start_net_device(struct hso_device *hso_dev);
+static void hso_free_shared_int(struct hso_shared_int *shared_int);
+static int hso_stop_net_device(struct hso_device *hso_dev);
+static void hso_serial_ref_free(struct kref *ref);
+static void hso_std_serial_read_bulk_callback(struct urb *urb);
+static int hso_mux_serial_read(struct hso_serial *serial);
+static void async_get_intf(struct work_struct *data);
+static void async_put_intf(struct work_struct *data);
+static int hso_put_activity(struct hso_device *hso_dev);
+static int hso_get_activity(struct hso_device *hso_dev);
+static void tiocmget_intr_callback(struct urb *urb);
+/*****************************************************************************/
+/* Helping functions                                                         */
+/*****************************************************************************/
+
+/* #define DEBUG */
+
+static inline struct hso_net *dev2net(struct hso_device *hso_dev)
+{
+	return hso_dev->port_data.dev_net;
+}
+
+static inline struct hso_serial *dev2ser(struct hso_device *hso_dev)
+{
+	return hso_dev->port_data.dev_serial;
+}
+
+/* Debugging functions */
+#ifdef DEBUG
+static void dbg_dump(int line_count, const char *func_name, unsigned char *buf,
+		     unsigned int len)
+{
+	static char name[255];
+
+	sprintf(name, "hso[%d:%s]", line_count, func_name);
+	print_hex_dump_bytes(name, DUMP_PREFIX_NONE, buf, len);
+}
+
+#define DUMP(buf_, len_)	\
+	dbg_dump(__LINE__, __func__, (unsigned char *)buf_, len_)
+
+#define DUMP1(buf_, len_)			\
+	do {					\
+		if (0x01 & debug)		\
+			DUMP(buf_, len_);	\
+	} while (0)
+#else
+#define DUMP(buf_, len_)
+#define DUMP1(buf_, len_)
+#endif
+
+/* module parameters */
+static int debug;
+static int tty_major;
+static int disable_net;
+
+/* driver info */
+static const char driver_name[] = "hso";
+static const char tty_filename[] = "ttyHS";
+static const char *version = __FILE__ ": " MOD_AUTHOR;
+/* the usb driver itself (registered in hso_init) */
+static struct usb_driver hso_driver;
+/* serial structures */
+static struct tty_driver *tty_drv;
+static struct hso_device *serial_table[HSO_SERIAL_TTY_MINORS];
+static struct hso_device *network_table[HSO_MAX_NET_DEVICES];
+static DEFINE_SPINLOCK(serial_table_lock);
+
+static const s32 default_port_spec[] = {
+	HSO_INTF_MUX | HSO_PORT_NETWORK,
+	HSO_INTF_BULK | HSO_PORT_DIAG,
+	HSO_INTF_BULK | HSO_PORT_MODEM,
+	0
+};
+
+static const s32 icon321_port_spec[] = {
+	HSO_INTF_MUX | HSO_PORT_NETWORK,
+	HSO_INTF_BULK | HSO_PORT_DIAG2,
+	HSO_INTF_BULK | HSO_PORT_MODEM,
+	HSO_INTF_BULK | HSO_PORT_DIAG,
+	0
+};
+
+#define default_port_device(vendor, product)	\
+	USB_DEVICE(vendor, product),	\
+		.driver_info = (kernel_ulong_t)default_port_spec
+
+#define icon321_port_device(vendor, product)	\
+	USB_DEVICE(vendor, product),	\
+		.driver_info = (kernel_ulong_t)icon321_port_spec
+
+/* list of devices we support */
+static const struct usb_device_id hso_ids[] = {
+	{default_port_device(0x0af0, 0x6711)},
+	{default_port_device(0x0af0, 0x6731)},
+	{default_port_device(0x0af0, 0x6751)},
+	{default_port_device(0x0af0, 0x6771)},
+	{default_port_device(0x0af0, 0x6791)},
+	{default_port_device(0x0af0, 0x6811)},
+	{default_port_device(0x0af0, 0x6911)},
+	{default_port_device(0x0af0, 0x6951)},
+	{default_port_device(0x0af0, 0x6971)},
+	{default_port_device(0x0af0, 0x7011)},
+	{default_port_device(0x0af0, 0x7031)},
+	{default_port_device(0x0af0, 0x7051)},
+	{default_port_device(0x0af0, 0x7071)},
+	{default_port_device(0x0af0, 0x7111)},
+	{default_port_device(0x0af0, 0x7211)},
+	{default_port_device(0x0af0, 0x7251)},
+	{default_port_device(0x0af0, 0x7271)},
+	{default_port_device(0x0af0, 0x7311)},
+	{default_port_device(0x0af0, 0xc031)},	/* Icon-Edge */
+	{icon321_port_device(0x0af0, 0xd013)},	/* Module HSxPA */
+	{icon321_port_device(0x0af0, 0xd031)},	/* Icon-321 */
+	{icon321_port_device(0x0af0, 0xd033)},	/* Icon-322 */
+	{USB_DEVICE(0x0af0, 0x7301)},		/* GE40x */
+	{USB_DEVICE(0x0af0, 0x7361)},		/* GE40x */
+	{USB_DEVICE(0x0af0, 0x7381)},		/* GE40x */
+	{USB_DEVICE(0x0af0, 0x7401)},		/* GI 0401 */
+	{USB_DEVICE(0x0af0, 0x7501)},		/* GTM 382 */
+	{USB_DEVICE(0x0af0, 0x7601)},		/* GE40x */
+	{USB_DEVICE(0x0af0, 0x7701)},
+	{USB_DEVICE(0x0af0, 0x7706)},
+	{USB_DEVICE(0x0af0, 0x7801)},
+	{USB_DEVICE(0x0af0, 0x7901)},
+	{USB_DEVICE(0x0af0, 0x7A01)},
+	{USB_DEVICE(0x0af0, 0x7A05)},
+	{USB_DEVICE(0x0af0, 0x8200)},
+	{USB_DEVICE(0x0af0, 0x8201)},
+	{USB_DEVICE(0x0af0, 0x8300)},
+	{USB_DEVICE(0x0af0, 0x8302)},
+	{USB_DEVICE(0x0af0, 0x8304)},
+	{USB_DEVICE(0x0af0, 0x8400)},
+	{USB_DEVICE(0x0af0, 0x8600)},
+	{USB_DEVICE(0x0af0, 0x8800)},
+	{USB_DEVICE(0x0af0, 0x8900)},
+	{USB_DEVICE(0x0af0, 0x9000)},
+	{USB_DEVICE(0x0af0, 0x9200)},		/* Option GTM671WFS */
+	{USB_DEVICE(0x0af0, 0xd035)},
+	{USB_DEVICE(0x0af0, 0xd055)},
+	{USB_DEVICE(0x0af0, 0xd155)},
+	{USB_DEVICE(0x0af0, 0xd255)},
+	{USB_DEVICE(0x0af0, 0xd057)},
+	{USB_DEVICE(0x0af0, 0xd157)},
+	{USB_DEVICE(0x0af0, 0xd257)},
+	{USB_DEVICE(0x0af0, 0xd357)},
+	{USB_DEVICE(0x0af0, 0xd058)},
+	{USB_DEVICE(0x0af0, 0xc100)},
+	{}
+};
+MODULE_DEVICE_TABLE(usb, hso_ids);
+
+/* Sysfs attribute */
+static ssize_t hsotype_show(struct device *dev,
+			    struct device_attribute *attr, char *buf)
+{
+	struct hso_device *hso_dev = dev_get_drvdata(dev);
+	char *port_name;
+
+	if (!hso_dev)
+		return 0;
+
+	switch (hso_dev->port_spec & HSO_PORT_MASK) {
+	case HSO_PORT_CONTROL:
+		port_name = "Control";
+		break;
+	case HSO_PORT_APP:
+		port_name = "Application";
+		break;
+	case HSO_PORT_APP2:
+		port_name = "Application2";
+		break;
+	case HSO_PORT_GPS:
+		port_name = "GPS";
+		break;
+	case HSO_PORT_GPS_CONTROL:
+		port_name = "GPS Control";
+		break;
+	case HSO_PORT_PCSC:
+		port_name = "PCSC";
+		break;
+	case HSO_PORT_DIAG:
+		port_name = "Diagnostic";
+		break;
+	case HSO_PORT_DIAG2:
+		port_name = "Diagnostic2";
+		break;
+	case HSO_PORT_MODEM:
+		port_name = "Modem";
+		break;
+	case HSO_PORT_NETWORK:
+		port_name = "Network";
+		break;
+	default:
+		port_name = "Unknown";
+		break;
+	}
+
+	return sprintf(buf, "%s\n", port_name);
+}
+static DEVICE_ATTR_RO(hsotype);
+
+static struct attribute *hso_serial_dev_attrs[] = {
+	&dev_attr_hsotype.attr,
+	NULL
+};
+
+ATTRIBUTE_GROUPS(hso_serial_dev);
+
+static int hso_urb_to_index(struct hso_serial *serial, struct urb *urb)
+{
+	int idx;
+
+	for (idx = 0; idx < serial->num_rx_urbs; idx++)
+		if (serial->rx_urb[idx] == urb)
+			return idx;
+	dev_err(serial->parent->dev, "hso_urb_to_index failed\n");
+	return -1;
+}
+
+/* converts mux value to a port spec value */
+static u32 hso_mux_to_port(int mux)
+{
+	u32 result;
+
+	switch (mux) {
+	case 0x1:
+		result = HSO_PORT_CONTROL;
+		break;
+	case 0x2:
+		result = HSO_PORT_APP;
+		break;
+	case 0x4:
+		result = HSO_PORT_PCSC;
+		break;
+	case 0x8:
+		result = HSO_PORT_GPS;
+		break;
+	case 0x10:
+		result = HSO_PORT_APP2;
+		break;
+	default:
+		result = HSO_PORT_NO_PORT;
+	}
+	return result;
+}
+
+/* converts port spec value to a mux value */
+static u32 hso_port_to_mux(int port)
+{
+	u32 result;
+
+	switch (port & HSO_PORT_MASK) {
+	case HSO_PORT_CONTROL:
+		result = 0x0;
+		break;
+	case HSO_PORT_APP:
+		result = 0x1;
+		break;
+	case HSO_PORT_PCSC:
+		result = 0x2;
+		break;
+	case HSO_PORT_GPS:
+		result = 0x3;
+		break;
+	case HSO_PORT_APP2:
+		result = 0x4;
+		break;
+	default:
+		result = 0x0;
+	}
+	return result;
+}
+
+static struct hso_serial *get_serial_by_shared_int_and_type(
+					struct hso_shared_int *shared_int,
+					int mux)
+{
+	int i, port;
+
+	port = hso_mux_to_port(mux);
+
+	for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
+		if (serial_table[i] &&
+		    (dev2ser(serial_table[i])->shared_int == shared_int) &&
+		    ((serial_table[i]->port_spec & HSO_PORT_MASK) == port)) {
+			return dev2ser(serial_table[i]);
+		}
+	}
+
+	return NULL;
+}
+
+static struct hso_serial *get_serial_by_index(unsigned index)
+{
+	struct hso_serial *serial = NULL;
+	unsigned long flags;
+
+	spin_lock_irqsave(&serial_table_lock, flags);
+	if (serial_table[index])
+		serial = dev2ser(serial_table[index]);
+	spin_unlock_irqrestore(&serial_table_lock, flags);
+
+	return serial;
+}
+
+static int obtain_minor(struct hso_serial *serial)
+{
+	int index;
+	unsigned long flags;
+
+	spin_lock_irqsave(&serial_table_lock, flags);
+	for (index = 0; index < HSO_SERIAL_TTY_MINORS; index++) {
+		if (serial_table[index] == NULL) {
+			serial_table[index] = serial->parent;
+			serial->minor = index;
+			spin_unlock_irqrestore(&serial_table_lock, flags);
+			return 0;
+		}
+	}
+	spin_unlock_irqrestore(&serial_table_lock, flags);
+
+	pr_err("%s: no free serial devices in table\n", __func__);
+	return -1;
+}
+
+static void release_minor(struct hso_serial *serial)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&serial_table_lock, flags);
+	serial_table[serial->minor] = NULL;
+	spin_unlock_irqrestore(&serial_table_lock, flags);
+}
+
+static void handle_usb_error(int status, const char *function,
+			     struct hso_device *hso_dev)
+{
+	char *explanation;
+
+	switch (status) {
+	case -ENODEV:
+		explanation = "no device";
+		break;
+	case -ENOENT:
+		explanation = "endpoint not enabled";
+		break;
+	case -EPIPE:
+		explanation = "endpoint stalled";
+		break;
+	case -ENOSPC:
+		explanation = "not enough bandwidth";
+		break;
+	case -ESHUTDOWN:
+		explanation = "device disabled";
+		break;
+	case -EHOSTUNREACH:
+		explanation = "device suspended";
+		break;
+	case -EINVAL:
+	case -EAGAIN:
+	case -EFBIG:
+	case -EMSGSIZE:
+		explanation = "internal error";
+		break;
+	case -EILSEQ:
+	case -EPROTO:
+	case -ETIME:
+	case -ETIMEDOUT:
+		explanation = "protocol error";
+		if (hso_dev)
+			usb_queue_reset_device(hso_dev->interface);
+		break;
+	default:
+		explanation = "unknown status";
+		break;
+	}
+
+	/* log a meaningful explanation of an USB status */
+	hso_dbg(0x1, "%s: received USB status - %s (%d)\n",
+		function, explanation, status);
+}
+
+/* Network interface functions */
+
+/* called when net interface is brought up by ifconfig */
+static int hso_net_open(struct net_device *net)
+{
+	struct hso_net *odev = netdev_priv(net);
+	unsigned long flags = 0;
+
+	if (!odev) {
+		dev_err(&net->dev, "No net device !\n");
+		return -ENODEV;
+	}
+
+	odev->skb_tx_buf = NULL;
+
+	/* setup environment */
+	spin_lock_irqsave(&odev->net_lock, flags);
+	odev->rx_parse_state = WAIT_IP;
+	odev->rx_buf_size = 0;
+	odev->rx_buf_missing = sizeof(struct iphdr);
+	spin_unlock_irqrestore(&odev->net_lock, flags);
+
+	/* We are up and running. */
+	set_bit(HSO_NET_RUNNING, &odev->flags);
+	hso_start_net_device(odev->parent);
+
+	/* Tell the kernel we are ready to start receiving from it */
+	netif_start_queue(net);
+
+	return 0;
+}
+
+/* called when interface is brought down by ifconfig */
+static int hso_net_close(struct net_device *net)
+{
+	struct hso_net *odev = netdev_priv(net);
+
+	/* we don't need the queue anymore */
+	netif_stop_queue(net);
+	/* no longer running */
+	clear_bit(HSO_NET_RUNNING, &odev->flags);
+
+	hso_stop_net_device(odev->parent);
+
+	/* done */
+	return 0;
+}
+
+/* USB tells is xmit done, we should start the netqueue again */
+static void write_bulk_callback(struct urb *urb)
+{
+	struct hso_net *odev = urb->context;
+	int status = urb->status;
+
+	/* Sanity check */
+	if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
+		dev_err(&urb->dev->dev, "%s: device not running\n", __func__);
+		return;
+	}
+
+	/* Do we still have a valid kernel network device? */
+	if (!netif_device_present(odev->net)) {
+		dev_err(&urb->dev->dev, "%s: net device not present\n",
+			__func__);
+		return;
+	}
+
+	/* log status, but don't act on it, we don't need to resubmit anything
+	 * anyhow */
+	if (status)
+		handle_usb_error(status, __func__, odev->parent);
+
+	hso_put_activity(odev->parent);
+
+	/* Tell the network interface we are ready for another frame */
+	netif_wake_queue(odev->net);
+}
+
+/* called by kernel when we need to transmit a packet */
+static netdev_tx_t hso_net_start_xmit(struct sk_buff *skb,
+					    struct net_device *net)
+{
+	struct hso_net *odev = netdev_priv(net);
+	int result;
+
+	/* Tell the kernel, "No more frames 'til we are done with this one." */
+	netif_stop_queue(net);
+	if (hso_get_activity(odev->parent) == -EAGAIN) {
+		odev->skb_tx_buf = skb;
+		return NETDEV_TX_OK;
+	}
+
+	/* log if asked */
+	DUMP1(skb->data, skb->len);
+	/* Copy it from kernel memory to OUR memory */
+	memcpy(odev->mux_bulk_tx_buf, skb->data, skb->len);
+	hso_dbg(0x1, "len: %d/%d\n", skb->len, MUX_BULK_TX_BUF_SIZE);
+
+	/* Fill in the URB for shipping it out. */
+	usb_fill_bulk_urb(odev->mux_bulk_tx_urb,
+			  odev->parent->usb,
+			  usb_sndbulkpipe(odev->parent->usb,
+					  odev->out_endp->
+					  bEndpointAddress & 0x7F),
+			  odev->mux_bulk_tx_buf, skb->len, write_bulk_callback,
+			  odev);
+
+	/* Deal with the Zero Length packet problem, I hope */
+	odev->mux_bulk_tx_urb->transfer_flags |= URB_ZERO_PACKET;
+
+	/* Send the URB on its merry way. */
+	result = usb_submit_urb(odev->mux_bulk_tx_urb, GFP_ATOMIC);
+	if (result) {
+		dev_warn(&odev->parent->interface->dev,
+			"failed mux_bulk_tx_urb %d\n", result);
+		net->stats.tx_errors++;
+		netif_start_queue(net);
+	} else {
+		net->stats.tx_packets++;
+		net->stats.tx_bytes += skb->len;
+	}
+	dev_kfree_skb(skb);
+	/* we're done */
+	return NETDEV_TX_OK;
+}
+
+static const struct ethtool_ops ops = {
+	.get_link = ethtool_op_get_link
+};
+
+/* called when a packet did not ack after watchdogtimeout */
+static void hso_net_tx_timeout(struct net_device *net, unsigned int txqueue)
+{
+	struct hso_net *odev = netdev_priv(net);
+
+	if (!odev)
+		return;
+
+	/* Tell syslog we are hosed. */
+	dev_warn(&net->dev, "Tx timed out.\n");
+
+	/* Tear the waiting frame off the list */
+	if (odev->mux_bulk_tx_urb)
+		usb_unlink_urb(odev->mux_bulk_tx_urb);
+
+	/* Update statistics */
+	net->stats.tx_errors++;
+}
+
+/* make a real packet from the received USB buffer */
+static void packetizeRx(struct hso_net *odev, unsigned char *ip_pkt,
+			unsigned int count, unsigned char is_eop)
+{
+	unsigned short temp_bytes;
+	unsigned short buffer_offset = 0;
+	unsigned short frame_len;
+
+	/* log if needed */
+	hso_dbg(0x1, "Rx %d bytes\n", count);
+	DUMP(ip_pkt, min(128, (int)count));
+
+	while (count) {
+		switch (odev->rx_parse_state) {
+		case WAIT_IP:
+			/* waiting for IP header. */
+			/* wanted bytes - size of ip header */
+			temp_bytes =
+			    (count <
+			     odev->rx_buf_missing) ? count : odev->
+			    rx_buf_missing;
+
+			memcpy(((unsigned char *)(&odev->rx_ip_hdr)) +
+			       odev->rx_buf_size, ip_pkt + buffer_offset,
+			       temp_bytes);
+
+			odev->rx_buf_size += temp_bytes;
+			buffer_offset += temp_bytes;
+			odev->rx_buf_missing -= temp_bytes;
+			count -= temp_bytes;
+
+			if (!odev->rx_buf_missing) {
+				/* header is complete allocate an sk_buffer and
+				 * continue to WAIT_DATA */
+				frame_len = ntohs(odev->rx_ip_hdr.tot_len);
+
+				if ((frame_len > DEFAULT_MRU) ||
+				    (frame_len < sizeof(struct iphdr))) {
+					dev_err(&odev->net->dev,
+						"Invalid frame (%d) length\n",
+						frame_len);
+					odev->rx_parse_state = WAIT_SYNC;
+					continue;
+				}
+				/* Allocate an sk_buff */
+				odev->skb_rx_buf = netdev_alloc_skb(odev->net,
+								    frame_len);
+				if (!odev->skb_rx_buf) {
+					/* We got no receive buffer. */
+					hso_dbg(0x1, "could not allocate memory\n");
+					odev->rx_parse_state = WAIT_SYNC;
+					continue;
+				}
+
+				/* Copy what we got so far. make room for iphdr
+				 * after tail. */
+				skb_put_data(odev->skb_rx_buf,
+					     (char *)&(odev->rx_ip_hdr),
+					     sizeof(struct iphdr));
+
+				/* ETH_HLEN */
+				odev->rx_buf_size = sizeof(struct iphdr);
+
+				/* Filip actually use .tot_len */
+				odev->rx_buf_missing =
+				    frame_len - sizeof(struct iphdr);
+				odev->rx_parse_state = WAIT_DATA;
+			}
+			break;
+
+		case WAIT_DATA:
+			temp_bytes = (count < odev->rx_buf_missing)
+					? count : odev->rx_buf_missing;
+
+			/* Copy the rest of the bytes that are left in the
+			 * buffer into the waiting sk_buf. */
+			/* Make room for temp_bytes after tail. */
+			skb_put_data(odev->skb_rx_buf,
+				     ip_pkt + buffer_offset,
+				     temp_bytes);
+
+			odev->rx_buf_missing -= temp_bytes;
+			count -= temp_bytes;
+			buffer_offset += temp_bytes;
+			odev->rx_buf_size += temp_bytes;
+			if (!odev->rx_buf_missing) {
+				/* Packet is complete. Inject into stack. */
+				/* We have IP packet here */
+				odev->skb_rx_buf->protocol = cpu_to_be16(ETH_P_IP);
+				skb_reset_mac_header(odev->skb_rx_buf);
+
+				/* Ship it off to the kernel */
+				netif_rx(odev->skb_rx_buf);
+				/* No longer our buffer. */
+				odev->skb_rx_buf = NULL;
+
+				/* update out statistics */
+				odev->net->stats.rx_packets++;
+
+				odev->net->stats.rx_bytes += odev->rx_buf_size;
+
+				odev->rx_buf_size = 0;
+				odev->rx_buf_missing = sizeof(struct iphdr);
+				odev->rx_parse_state = WAIT_IP;
+			}
+			break;
+
+		case WAIT_SYNC:
+			hso_dbg(0x1, " W_S\n");
+			count = 0;
+			break;
+		default:
+			hso_dbg(0x1, "\n");
+			count--;
+			break;
+		}
+	}
+
+	/* Recovery mechanism for WAIT_SYNC state. */
+	if (is_eop) {
+		if (odev->rx_parse_state == WAIT_SYNC) {
+			odev->rx_parse_state = WAIT_IP;
+			odev->rx_buf_size = 0;
+			odev->rx_buf_missing = sizeof(struct iphdr);
+		}
+	}
+}
+
+static void fix_crc_bug(struct urb *urb, __le16 max_packet_size)
+{
+	static const u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
+	u32 rest = urb->actual_length % le16_to_cpu(max_packet_size);
+
+	if (((rest == 5) || (rest == 6)) &&
+	    !memcmp(((u8 *)urb->transfer_buffer) + urb->actual_length - 4,
+		    crc_check, 4)) {
+		urb->actual_length -= 4;
+	}
+}
+
+/* Moving data from usb to kernel (in interrupt state) */
+static void read_bulk_callback(struct urb *urb)
+{
+	struct hso_net *odev = urb->context;
+	struct net_device *net;
+	int result;
+	unsigned long flags;
+	int status = urb->status;
+
+	/* is al ok?  (Filip: Who's Al ?) */
+	if (status) {
+		handle_usb_error(status, __func__, odev->parent);
+		return;
+	}
+
+	/* Sanity check */
+	if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
+		hso_dbg(0x1, "BULK IN callback but driver is not active!\n");
+		return;
+	}
+	usb_mark_last_busy(urb->dev);
+
+	net = odev->net;
+
+	if (!netif_device_present(net)) {
+		/* Somebody killed our network interface... */
+		return;
+	}
+
+	if (odev->parent->port_spec & HSO_INFO_CRC_BUG)
+		fix_crc_bug(urb, odev->in_endp->wMaxPacketSize);
+
+	/* do we even have a packet? */
+	if (urb->actual_length) {
+		/* Handle the IP stream, add header and push it onto network
+		 * stack if the packet is complete. */
+		spin_lock_irqsave(&odev->net_lock, flags);
+		packetizeRx(odev, urb->transfer_buffer, urb->actual_length,
+			    (urb->transfer_buffer_length >
+			     urb->actual_length) ? 1 : 0);
+		spin_unlock_irqrestore(&odev->net_lock, flags);
+	}
+
+	/* We are done with this URB, resubmit it. Prep the USB to wait for
+	 * another frame. Reuse same as received. */
+	usb_fill_bulk_urb(urb,
+			  odev->parent->usb,
+			  usb_rcvbulkpipe(odev->parent->usb,
+					  odev->in_endp->
+					  bEndpointAddress & 0x7F),
+			  urb->transfer_buffer, MUX_BULK_RX_BUF_SIZE,
+			  read_bulk_callback, odev);
+
+	/* Give this to the USB subsystem so it can tell us when more data
+	 * arrives. */
+	result = usb_submit_urb(urb, GFP_ATOMIC);
+	if (result)
+		dev_warn(&odev->parent->interface->dev,
+			 "%s failed submit mux_bulk_rx_urb %d\n", __func__,
+			 result);
+}
+
+/* Serial driver functions */
+
+static void hso_init_termios(struct ktermios *termios)
+{
+	/*
+	 * The default requirements for this device are:
+	 */
+	termios->c_iflag &=
+		~(IGNBRK	/* disable ignore break */
+		| BRKINT	/* disable break causes interrupt */
+		| PARMRK	/* disable mark parity errors */
+		| ISTRIP	/* disable clear high bit of input characters */
+		| INLCR		/* disable translate NL to CR */
+		| IGNCR		/* disable ignore CR */
+		| ICRNL		/* disable translate CR to NL */
+		| IXON);	/* disable enable XON/XOFF flow control */
+
+	/* disable postprocess output characters */
+	termios->c_oflag &= ~OPOST;
+
+	termios->c_lflag &=
+		~(ECHO		/* disable echo input characters */
+		| ECHONL	/* disable echo new line */
+		| ICANON	/* disable erase, kill, werase, and rprnt
+				   special characters */
+		| ISIG		/* disable interrupt, quit, and suspend special
+				   characters */
+		| IEXTEN);	/* disable non-POSIX special characters */
+
+	termios->c_cflag &=
+		~(CSIZE		/* no size */
+		| PARENB	/* disable parity bit */
+		| CBAUD		/* clear current baud rate */
+		| CBAUDEX);	/* clear current buad rate */
+
+	termios->c_cflag |= CS8;	/* character size 8 bits */
+
+	/* baud rate 115200 */
+	tty_termios_encode_baud_rate(termios, 115200, 115200);
+}
+
+static void _hso_serial_set_termios(struct tty_struct *tty)
+{
+	struct hso_serial *serial = tty->driver_data;
+
+	if (!serial) {
+		pr_err("%s: no tty structures", __func__);
+		return;
+	}
+
+	hso_dbg(0x8, "port %d\n", serial->minor);
+
+	/*
+	 *	Fix up unsupported bits
+	 */
+	tty->termios.c_iflag &= ~IXON; /* disable enable XON/XOFF flow control */
+
+	tty->termios.c_cflag &=
+		~(CSIZE		/* no size */
+		| PARENB	/* disable parity bit */
+		| CBAUD		/* clear current baud rate */
+		| CBAUDEX);	/* clear current buad rate */
+
+	tty->termios.c_cflag |= CS8;	/* character size 8 bits */
+
+	/* baud rate 115200 */
+	tty_encode_baud_rate(tty, 115200, 115200);
+}
+
+static void hso_resubmit_rx_bulk_urb(struct hso_serial *serial, struct urb *urb)
+{
+	int result;
+	/* We are done with this URB, resubmit it. Prep the USB to wait for
+	 * another frame */
+	usb_fill_bulk_urb(urb, serial->parent->usb,
+			  usb_rcvbulkpipe(serial->parent->usb,
+					  serial->in_endp->
+					  bEndpointAddress & 0x7F),
+			  urb->transfer_buffer, serial->rx_data_length,
+			  hso_std_serial_read_bulk_callback, serial);
+	/* Give this to the USB subsystem so it can tell us when more data
+	 * arrives. */
+	result = usb_submit_urb(urb, GFP_ATOMIC);
+	if (result) {
+		dev_err(&urb->dev->dev, "%s failed submit serial rx_urb %d\n",
+			__func__, result);
+	}
+}
+
+
+
+
+static void put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial *serial)
+{
+	int count;
+	struct urb *curr_urb;
+
+	while (serial->rx_urb_filled[serial->curr_rx_urb_idx]) {
+		curr_urb = serial->rx_urb[serial->curr_rx_urb_idx];
+		count = put_rxbuf_data(curr_urb, serial);
+		if (count == -1)
+			return;
+		if (count == 0) {
+			serial->curr_rx_urb_idx++;
+			if (serial->curr_rx_urb_idx >= serial->num_rx_urbs)
+				serial->curr_rx_urb_idx = 0;
+			hso_resubmit_rx_bulk_urb(serial, curr_urb);
+		}
+	}
+}
+
+static void put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial *serial)
+{
+	int count = 0;
+	struct urb *urb;
+
+	urb = serial->rx_urb[0];
+	if (serial->port.count > 0) {
+		count = put_rxbuf_data(urb, serial);
+		if (count == -1)
+			return;
+	}
+	/* Re issue a read as long as we receive data. */
+
+	if (count == 0 && ((urb->actual_length != 0) ||
+			   (serial->rx_state == RX_PENDING))) {
+		serial->rx_state = RX_SENT;
+		hso_mux_serial_read(serial);
+	} else
+		serial->rx_state = RX_IDLE;
+}
+
+
+/* read callback for Diag and CS port */
+static void hso_std_serial_read_bulk_callback(struct urb *urb)
+{
+	struct hso_serial *serial = urb->context;
+	int status = urb->status;
+	unsigned long flags;
+
+	hso_dbg(0x8, "--- Got serial_read_bulk callback %02x ---\n", status);
+
+	/* sanity check */
+	if (!serial) {
+		hso_dbg(0x1, "serial == NULL\n");
+		return;
+	}
+	if (status) {
+		handle_usb_error(status, __func__, serial->parent);
+		return;
+	}
+
+	hso_dbg(0x1, "Actual length = %d\n", urb->actual_length);
+	DUMP1(urb->transfer_buffer, urb->actual_length);
+
+	/* Anyone listening? */
+	if (serial->port.count == 0)
+		return;
+
+	if (serial->parent->port_spec & HSO_INFO_CRC_BUG)
+		fix_crc_bug(urb, serial->in_endp->wMaxPacketSize);
+	/* Valid data, handle RX data */
+	spin_lock_irqsave(&serial->serial_lock, flags);
+	serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 1;
+	put_rxbuf_data_and_resubmit_bulk_urb(serial);
+	spin_unlock_irqrestore(&serial->serial_lock, flags);
+}
+
+/*
+ * This needs to be a tasklet otherwise we will
+ * end up recursively calling this function.
+ */
+static void hso_unthrottle_tasklet(struct tasklet_struct *t)
+{
+	struct hso_serial *serial = from_tasklet(serial, t,
+						 unthrottle_tasklet);
+	unsigned long flags;
+
+	spin_lock_irqsave(&serial->serial_lock, flags);
+	if ((serial->parent->port_spec & HSO_INTF_MUX))
+		put_rxbuf_data_and_resubmit_ctrl_urb(serial);
+	else
+		put_rxbuf_data_and_resubmit_bulk_urb(serial);
+	spin_unlock_irqrestore(&serial->serial_lock, flags);
+}
+
+static	void hso_unthrottle(struct tty_struct *tty)
+{
+	struct hso_serial *serial = tty->driver_data;
+
+	tasklet_hi_schedule(&serial->unthrottle_tasklet);
+}
+
+/* open the requested serial port */
+static int hso_serial_open(struct tty_struct *tty, struct file *filp)
+{
+	struct hso_serial *serial = get_serial_by_index(tty->index);
+	int result;
+
+	/* sanity check */
+	if (serial == NULL || serial->magic != HSO_SERIAL_MAGIC) {
+		WARN_ON(1);
+		tty->driver_data = NULL;
+		hso_dbg(0x1, "Failed to open port\n");
+		return -ENODEV;
+	}
+
+	mutex_lock(&serial->parent->mutex);
+	result = usb_autopm_get_interface(serial->parent->interface);
+	if (result < 0)
+		goto err_out;
+
+	hso_dbg(0x1, "Opening %d\n", serial->minor);
+
+	/* setup */
+	tty->driver_data = serial;
+	tty_port_tty_set(&serial->port, tty);
+
+	/* check for port already opened, if not set the termios */
+	serial->port.count++;
+	if (serial->port.count == 1) {
+		serial->rx_state = RX_IDLE;
+		/* Force default termio settings */
+		_hso_serial_set_termios(tty);
+		tasklet_setup(&serial->unthrottle_tasklet,
+			      hso_unthrottle_tasklet);
+		result = hso_start_serial_device(serial->parent, GFP_KERNEL);
+		if (result) {
+			hso_stop_serial_device(serial->parent);
+			serial->port.count--;
+		} else {
+			kref_get(&serial->parent->ref);
+		}
+	} else {
+		hso_dbg(0x1, "Port was already open\n");
+	}
+
+	usb_autopm_put_interface(serial->parent->interface);
+
+	/* done */
+	if (result)
+		hso_serial_tiocmset(tty, TIOCM_RTS | TIOCM_DTR, 0);
+err_out:
+	mutex_unlock(&serial->parent->mutex);
+	return result;
+}
+
+/* close the requested serial port */
+static void hso_serial_close(struct tty_struct *tty, struct file *filp)
+{
+	struct hso_serial *serial = tty->driver_data;
+	u8 usb_gone;
+
+	hso_dbg(0x1, "Closing serial port\n");
+
+	/* Open failed, no close cleanup required */
+	if (serial == NULL)
+		return;
+
+	mutex_lock(&serial->parent->mutex);
+	usb_gone = serial->parent->usb_gone;
+
+	if (!usb_gone)
+		usb_autopm_get_interface(serial->parent->interface);
+
+	/* reset the rts and dtr */
+	/* do the actual close */
+	serial->port.count--;
+
+	if (serial->port.count <= 0) {
+		serial->port.count = 0;
+		tty_port_tty_set(&serial->port, NULL);
+		if (!usb_gone)
+			hso_stop_serial_device(serial->parent);
+		tasklet_kill(&serial->unthrottle_tasklet);
+	}
+
+	if (!usb_gone)
+		usb_autopm_put_interface(serial->parent->interface);
+
+	mutex_unlock(&serial->parent->mutex);
+}
+
+/* close the requested serial port */
+static ssize_t hso_serial_write(struct tty_struct *tty, const u8 *buf,
+				size_t count)
+{
+	struct hso_serial *serial = tty->driver_data;
+	unsigned long flags;
+
+	/* sanity check */
+	if (serial == NULL) {
+		pr_err("%s: serial is NULL\n", __func__);
+		return -ENODEV;
+	}
+
+	spin_lock_irqsave(&serial->serial_lock, flags);
+
+	count = min_t(size_t, serial->tx_data_length - serial->tx_buffer_count,
+		      count);
+	memcpy(serial->tx_buffer + serial->tx_buffer_count, buf, count);
+	serial->tx_buffer_count += count;
+
+	spin_unlock_irqrestore(&serial->serial_lock, flags);
+
+	hso_kick_transmit(serial);
+	/* done */
+	return count;
+}
+
+/* how much room is there for writing */
+static unsigned int hso_serial_write_room(struct tty_struct *tty)
+{
+	struct hso_serial *serial = tty->driver_data;
+	unsigned int room;
+	unsigned long flags;
+
+	spin_lock_irqsave(&serial->serial_lock, flags);
+	room = serial->tx_data_length - serial->tx_buffer_count;
+	spin_unlock_irqrestore(&serial->serial_lock, flags);
+
+	/* return free room */
+	return room;
+}
+
+static void hso_serial_cleanup(struct tty_struct *tty)
+{
+	struct hso_serial *serial = tty->driver_data;
+
+	if (!serial)
+		return;
+
+	kref_put(&serial->parent->ref, hso_serial_ref_free);
+}
+
+/* setup the term */
+static void hso_serial_set_termios(struct tty_struct *tty,
+				   const struct ktermios *old)
+{
+	struct hso_serial *serial = tty->driver_data;
+	unsigned long flags;
+
+	if (old)
+		hso_dbg(0x16, "Termios called with: cflags new[%u] - old[%u]\n",
+			(unsigned int)tty->termios.c_cflag,
+			(unsigned int)old->c_cflag);
+
+	/* the actual setup */
+	spin_lock_irqsave(&serial->serial_lock, flags);
+	if (serial->port.count)
+		_hso_serial_set_termios(tty);
+	else
+		tty->termios = *old;
+	spin_unlock_irqrestore(&serial->serial_lock, flags);
+
+	/* done */
+}
+
+/* how many characters in the buffer */
+static unsigned int hso_serial_chars_in_buffer(struct tty_struct *tty)
+{
+	struct hso_serial *serial = tty->driver_data;
+	unsigned long flags;
+	unsigned int chars;
+
+	/* sanity check */
+	if (serial == NULL)
+		return 0;
+
+	spin_lock_irqsave(&serial->serial_lock, flags);
+	chars = serial->tx_buffer_count;
+	spin_unlock_irqrestore(&serial->serial_lock, flags);
+
+	return chars;
+}
+static int tiocmget_submit_urb(struct hso_serial *serial,
+			       struct hso_tiocmget *tiocmget,
+			       struct usb_device *usb)
+{
+	int result;
+
+	if (serial->parent->usb_gone)
+		return -ENODEV;
+	usb_fill_int_urb(tiocmget->urb, usb,
+			 usb_rcvintpipe(usb,
+					tiocmget->endp->
+					bEndpointAddress & 0x7F),
+			 tiocmget->serial_state_notification,
+			 sizeof(struct hso_serial_state_notification),
+			 tiocmget_intr_callback, serial,
+			 tiocmget->endp->bInterval);
+	result = usb_submit_urb(tiocmget->urb, GFP_ATOMIC);
+	if (result) {
+		dev_warn(&usb->dev, "%s usb_submit_urb failed %d\n", __func__,
+			 result);
+	}
+	return result;
+
+}
+
+static void tiocmget_intr_callback(struct urb *urb)
+{
+	struct hso_serial *serial = urb->context;
+	struct hso_tiocmget *tiocmget;
+	int status = urb->status;
+	u16 UART_state_bitmap, prev_UART_state_bitmap;
+	struct uart_icount *icount;
+	struct hso_serial_state_notification *serial_state_notification;
+	struct usb_device *usb;
+	struct usb_interface *interface;
+	int if_num;
+
+	/* Sanity checks */
+	if (!serial)
+		return;
+	if (status) {
+		handle_usb_error(status, __func__, serial->parent);
+		return;
+	}
+
+	/* tiocmget is only supported on HSO_PORT_MODEM */
+	tiocmget = serial->tiocmget;
+	if (!tiocmget)
+		return;
+	BUG_ON((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM);
+
+	usb = serial->parent->usb;
+	interface = serial->parent->interface;
+
+	if_num = interface->cur_altsetting->desc.bInterfaceNumber;
+
+	/* wIndex should be the USB interface number of the port to which the
+	 * notification applies, which should always be the Modem port.
+	 */
+	serial_state_notification = tiocmget->serial_state_notification;
+	if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE ||
+	    serial_state_notification->bNotification != B_NOTIFICATION ||
+	    le16_to_cpu(serial_state_notification->wValue) != W_VALUE ||
+	    le16_to_cpu(serial_state_notification->wIndex) != if_num ||
+	    le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) {
+		dev_warn(&usb->dev,
+			 "hso received invalid serial state notification\n");
+		DUMP(serial_state_notification,
+		     sizeof(struct hso_serial_state_notification));
+	} else {
+		unsigned long flags;
+
+		UART_state_bitmap = le16_to_cpu(serial_state_notification->
+						UART_state_bitmap);
+		prev_UART_state_bitmap = tiocmget->prev_UART_state_bitmap;
+		icount = &tiocmget->icount;
+		spin_lock_irqsave(&serial->serial_lock, flags);
+		if ((UART_state_bitmap & B_OVERRUN) !=
+		   (prev_UART_state_bitmap & B_OVERRUN))
+			icount->parity++;
+		if ((UART_state_bitmap & B_PARITY) !=
+		   (prev_UART_state_bitmap & B_PARITY))
+			icount->parity++;
+		if ((UART_state_bitmap & B_FRAMING) !=
+		   (prev_UART_state_bitmap & B_FRAMING))
+			icount->frame++;
+		if ((UART_state_bitmap & B_RING_SIGNAL) &&
+		   !(prev_UART_state_bitmap & B_RING_SIGNAL))
+			icount->rng++;
+		if ((UART_state_bitmap & B_BREAK) !=
+		   (prev_UART_state_bitmap & B_BREAK))
+			icount->brk++;
+		if ((UART_state_bitmap & B_TX_CARRIER) !=
+		   (prev_UART_state_bitmap & B_TX_CARRIER))
+			icount->dsr++;
+		if ((UART_state_bitmap & B_RX_CARRIER) !=
+		   (prev_UART_state_bitmap & B_RX_CARRIER))
+			icount->dcd++;
+		tiocmget->prev_UART_state_bitmap = UART_state_bitmap;
+		spin_unlock_irqrestore(&serial->serial_lock, flags);
+		tiocmget->intr_completed = 1;
+		wake_up_interruptible(&tiocmget->waitq);
+	}
+	memset(serial_state_notification, 0,
+	       sizeof(struct hso_serial_state_notification));
+	tiocmget_submit_urb(serial,
+			    tiocmget,
+			    serial->parent->usb);
+}
+
+/*
+ * next few functions largely stolen from drivers/serial/serial_core.c
+ */
+/* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
+ * - mask passed in arg for lines of interest
+ *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
+ * Caller should use TIOCGICOUNT to see which one it was
+ */
+static int
+hso_wait_modem_status(struct hso_serial *serial, unsigned long arg)
+{
+	DECLARE_WAITQUEUE(wait, current);
+	struct uart_icount cprev, cnow;
+	struct hso_tiocmget  *tiocmget;
+	int ret;
+
+	tiocmget = serial->tiocmget;
+	if (!tiocmget)
+		return -ENOENT;
+	/*
+	 * note the counters on entry
+	 */
+	spin_lock_irq(&serial->serial_lock);
+	memcpy(&cprev, &tiocmget->icount, sizeof(struct uart_icount));
+	spin_unlock_irq(&serial->serial_lock);
+	add_wait_queue(&tiocmget->waitq, &wait);
+	for (;;) {
+		spin_lock_irq(&serial->serial_lock);
+		memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
+		spin_unlock_irq(&serial->serial_lock);
+		set_current_state(TASK_INTERRUPTIBLE);
+		if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
+		    ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
+		    ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd))) {
+			ret = 0;
+			break;
+		}
+		schedule();
+		/* see if a signal did it */
+		if (signal_pending(current)) {
+			ret = -ERESTARTSYS;
+			break;
+		}
+		cprev = cnow;
+	}
+	__set_current_state(TASK_RUNNING);
+	remove_wait_queue(&tiocmget->waitq, &wait);
+
+	return ret;
+}
+
+/*
+ * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
+ * Return: write counters to the user passed counter struct
+ * NB: both 1->0 and 0->1 transitions are counted except for
+ *     RI where only 0->1 is counted.
+ */
+static int hso_get_count(struct tty_struct *tty,
+		  struct serial_icounter_struct *icount)
+{
+	struct uart_icount cnow;
+	struct hso_serial *serial = tty->driver_data;
+	struct hso_tiocmget  *tiocmget = serial->tiocmget;
+
+	memset(icount, 0, sizeof(struct serial_icounter_struct));
+
+	if (!tiocmget)
+		 return -ENOENT;
+	spin_lock_irq(&serial->serial_lock);
+	memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
+	spin_unlock_irq(&serial->serial_lock);
+
+	icount->cts         = cnow.cts;
+	icount->dsr         = cnow.dsr;
+	icount->rng         = cnow.rng;
+	icount->dcd         = cnow.dcd;
+	icount->rx          = cnow.rx;
+	icount->tx          = cnow.tx;
+	icount->frame       = cnow.frame;
+	icount->overrun     = cnow.overrun;
+	icount->parity      = cnow.parity;
+	icount->brk         = cnow.brk;
+	icount->buf_overrun = cnow.buf_overrun;
+
+	return 0;
+}
+
+
+static int hso_serial_tiocmget(struct tty_struct *tty)
+{
+	int retval;
+	struct hso_serial *serial = tty->driver_data;
+	struct hso_tiocmget  *tiocmget;
+	u16 UART_state_bitmap;
+
+	/* sanity check */
+	if (!serial) {
+		hso_dbg(0x1, "no tty structures\n");
+		return -EINVAL;
+	}
+	spin_lock_irq(&serial->serial_lock);
+	retval = ((serial->rts_state) ? TIOCM_RTS : 0) |
+	    ((serial->dtr_state) ? TIOCM_DTR : 0);
+	tiocmget = serial->tiocmget;
+	if (tiocmget) {
+
+		UART_state_bitmap = le16_to_cpu(
+			tiocmget->prev_UART_state_bitmap);
+		if (UART_state_bitmap & B_RING_SIGNAL)
+			retval |=  TIOCM_RNG;
+		if (UART_state_bitmap & B_RX_CARRIER)
+			retval |=  TIOCM_CD;
+		if (UART_state_bitmap & B_TX_CARRIER)
+			retval |=  TIOCM_DSR;
+	}
+	spin_unlock_irq(&serial->serial_lock);
+	return retval;
+}
+
+static int hso_serial_tiocmset(struct tty_struct *tty,
+			       unsigned int set, unsigned int clear)
+{
+	int val = 0;
+	unsigned long flags;
+	int if_num;
+	struct hso_serial *serial = tty->driver_data;
+	struct usb_interface *interface;
+
+	/* sanity check */
+	if (!serial) {
+		hso_dbg(0x1, "no tty structures\n");
+		return -EINVAL;
+	}
+
+	if ((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM)
+		return -EINVAL;
+
+	interface = serial->parent->interface;
+	if_num = interface->cur_altsetting->desc.bInterfaceNumber;
+
+	spin_lock_irqsave(&serial->serial_lock, flags);
+	if (set & TIOCM_RTS)
+		serial->rts_state = 1;
+	if (set & TIOCM_DTR)
+		serial->dtr_state = 1;
+
+	if (clear & TIOCM_RTS)
+		serial->rts_state = 0;
+	if (clear & TIOCM_DTR)
+		serial->dtr_state = 0;
+
+	if (serial->dtr_state)
+		val |= 0x01;
+	if (serial->rts_state)
+		val |= 0x02;
+
+	spin_unlock_irqrestore(&serial->serial_lock, flags);
+
+	return usb_control_msg(serial->parent->usb,
+			       usb_sndctrlpipe(serial->parent->usb, 0), 0x22,
+			       0x21, val, if_num, NULL, 0,
+			       USB_CTRL_SET_TIMEOUT);
+}
+
+static int hso_serial_ioctl(struct tty_struct *tty,
+			    unsigned int cmd, unsigned long arg)
+{
+	struct hso_serial *serial = tty->driver_data;
+	int ret = 0;
+	hso_dbg(0x8, "IOCTL cmd: %d, arg: %ld\n", cmd, arg);
+
+	if (!serial)
+		return -ENODEV;
+	switch (cmd) {
+	case TIOCMIWAIT:
+		ret = hso_wait_modem_status(serial, arg);
+		break;
+	default:
+		ret = -ENOIOCTLCMD;
+		break;
+	}
+	return ret;
+}
+
+
+/* starts a transmit */
+static void hso_kick_transmit(struct hso_serial *serial)
+{
+	unsigned long flags;
+	int res;
+
+	spin_lock_irqsave(&serial->serial_lock, flags);
+	if (!serial->tx_buffer_count)
+		goto out;
+
+	if (serial->tx_urb_used)
+		goto out;
+
+	/* Wakeup USB interface if necessary */
+	if (hso_get_activity(serial->parent) == -EAGAIN)
+		goto out;
+
+	/* Switch pointers around to avoid memcpy */
+	swap(serial->tx_buffer, serial->tx_data);
+	serial->tx_data_count = serial->tx_buffer_count;
+	serial->tx_buffer_count = 0;
+
+	/* If serial->tx_data is set, it means we switched buffers */
+	if (serial->tx_data && serial->write_data) {
+		res = serial->write_data(serial);
+		if (res >= 0)
+			serial->tx_urb_used = 1;
+	}
+out:
+	spin_unlock_irqrestore(&serial->serial_lock, flags);
+}
+
+/* make a request (for reading and writing data to muxed serial port) */
+static int mux_device_request(struct hso_serial *serial, u8 type, u16 port,
+			      struct urb *ctrl_urb,
+			      struct usb_ctrlrequest *ctrl_req,
+			      u8 *ctrl_urb_data, u32 size)
+{
+	int result;
+	int pipe;
+
+	/* Sanity check */
+	if (!serial || !ctrl_urb || !ctrl_req) {
+		pr_err("%s: Wrong arguments\n", __func__);
+		return -EINVAL;
+	}
+
+	/* initialize */
+	ctrl_req->wValue = 0;
+	ctrl_req->wIndex = cpu_to_le16(hso_port_to_mux(port));
+	ctrl_req->wLength = cpu_to_le16(size);
+
+	if (type == USB_CDC_GET_ENCAPSULATED_RESPONSE) {
+		/* Reading command */
+		ctrl_req->bRequestType = USB_DIR_IN |
+					 USB_TYPE_OPTION_VENDOR |
+					 USB_RECIP_INTERFACE;
+		ctrl_req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
+		pipe = usb_rcvctrlpipe(serial->parent->usb, 0);
+	} else {
+		/* Writing command */
+		ctrl_req->bRequestType = USB_DIR_OUT |
+					 USB_TYPE_OPTION_VENDOR |
+					 USB_RECIP_INTERFACE;
+		ctrl_req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
+		pipe = usb_sndctrlpipe(serial->parent->usb, 0);
+	}
+	/* syslog */
+	hso_dbg(0x2, "%s command (%02x) len: %d, port: %d\n",
+		type == USB_CDC_GET_ENCAPSULATED_RESPONSE ? "Read" : "Write",
+		ctrl_req->bRequestType, ctrl_req->wLength, port);
+
+	/* Load ctrl urb */
+	ctrl_urb->transfer_flags = 0;
+	usb_fill_control_urb(ctrl_urb,
+			     serial->parent->usb,
+			     pipe,
+			     (u8 *) ctrl_req,
+			     ctrl_urb_data, size, ctrl_callback, serial);
+	/* Send it on merry way */
+	result = usb_submit_urb(ctrl_urb, GFP_ATOMIC);
+	if (result) {
+		dev_err(&ctrl_urb->dev->dev,
+			"%s failed submit ctrl_urb %d type %d\n", __func__,
+			result, type);
+		return result;
+	}
+
+	/* done */
+	return size;
+}
+
+/* called by intr_callback when read occurs */
+static int hso_mux_serial_read(struct hso_serial *serial)
+{
+	if (!serial)
+		return -EINVAL;
+
+	/* clean data */
+	memset(serial->rx_data[0], 0, CTRL_URB_RX_SIZE);
+	/* make the request */
+
+	if (serial->num_rx_urbs != 1) {
+		dev_err(&serial->parent->interface->dev,
+			"ERROR: mux'd reads with multiple buffers "
+			"not possible\n");
+		return 0;
+	}
+	return mux_device_request(serial,
+				  USB_CDC_GET_ENCAPSULATED_RESPONSE,
+				  serial->parent->port_spec & HSO_PORT_MASK,
+				  serial->rx_urb[0],
+				  &serial->ctrl_req_rx,
+				  serial->rx_data[0], serial->rx_data_length);
+}
+
+/* used for muxed serial port callback (muxed serial read) */
+static void intr_callback(struct urb *urb)
+{
+	struct hso_shared_int *shared_int = urb->context;
+	struct hso_serial *serial;
+	unsigned char *port_req;
+	int status = urb->status;
+	unsigned long flags;
+	int i;
+
+	usb_mark_last_busy(urb->dev);
+
+	/* sanity check */
+	if (!shared_int)
+		return;
+
+	/* status check */
+	if (status) {
+		handle_usb_error(status, __func__, NULL);
+		return;
+	}
+	hso_dbg(0x8, "--- Got intr callback 0x%02X ---\n", status);
+
+	/* what request? */
+	port_req = urb->transfer_buffer;
+	hso_dbg(0x8, "port_req = 0x%.2X\n", *port_req);
+	/* loop over all muxed ports to find the one sending this */
+	for (i = 0; i < 8; i++) {
+		/* max 8 channels on MUX */
+		if (*port_req & (1 << i)) {
+			serial = get_serial_by_shared_int_and_type(shared_int,
+								   (1 << i));
+			if (serial != NULL) {
+				hso_dbg(0x1, "Pending read interrupt on port %d\n",
+					i);
+				spin_lock_irqsave(&serial->serial_lock, flags);
+				if (serial->rx_state == RX_IDLE &&
+					serial->port.count > 0) {
+					/* Setup and send a ctrl req read on
+					 * port i */
+					if (!serial->rx_urb_filled[0]) {
+						serial->rx_state = RX_SENT;
+						hso_mux_serial_read(serial);
+					} else
+						serial->rx_state = RX_PENDING;
+				} else {
+					hso_dbg(0x1, "Already a read pending on port %d or port not open\n",
+						i);
+				}
+				spin_unlock_irqrestore(&serial->serial_lock,
+						       flags);
+			}
+		}
+	}
+	/* Resubmit interrupt urb */
+	hso_mux_submit_intr_urb(shared_int, urb->dev, GFP_ATOMIC);
+}
+
+/* called for writing to muxed serial port */
+static int hso_mux_serial_write_data(struct hso_serial *serial)
+{
+	if (NULL == serial)
+		return -EINVAL;
+
+	return mux_device_request(serial,
+				  USB_CDC_SEND_ENCAPSULATED_COMMAND,
+				  serial->parent->port_spec & HSO_PORT_MASK,
+				  serial->tx_urb,
+				  &serial->ctrl_req_tx,
+				  serial->tx_data, serial->tx_data_count);
+}
+
+/* write callback for Diag and CS port */
+static void hso_std_serial_write_bulk_callback(struct urb *urb)
+{
+	struct hso_serial *serial = urb->context;
+	int status = urb->status;
+	unsigned long flags;
+
+	/* sanity check */
+	if (!serial) {
+		hso_dbg(0x1, "serial == NULL\n");
+		return;
+	}
+
+	spin_lock_irqsave(&serial->serial_lock, flags);
+	serial->tx_urb_used = 0;
+	spin_unlock_irqrestore(&serial->serial_lock, flags);
+	if (status) {
+		handle_usb_error(status, __func__, serial->parent);
+		return;
+	}
+	hso_put_activity(serial->parent);
+	tty_port_tty_wakeup(&serial->port);
+	hso_kick_transmit(serial);
+
+	hso_dbg(0x1, "\n");
+}
+
+/* called for writing diag or CS serial port */
+static int hso_std_serial_write_data(struct hso_serial *serial)
+{
+	int count = serial->tx_data_count;
+	int result;
+
+	usb_fill_bulk_urb(serial->tx_urb,
+			  serial->parent->usb,
+			  usb_sndbulkpipe(serial->parent->usb,
+					  serial->out_endp->
+					  bEndpointAddress & 0x7F),
+			  serial->tx_data, serial->tx_data_count,
+			  hso_std_serial_write_bulk_callback, serial);
+
+	result = usb_submit_urb(serial->tx_urb, GFP_ATOMIC);
+	if (result) {
+		dev_warn(&serial->parent->usb->dev,
+			 "Failed to submit urb - res %d\n", result);
+		return result;
+	}
+
+	return count;
+}
+
+/* callback after read or write on muxed serial port */
+static void ctrl_callback(struct urb *urb)
+{
+	struct hso_serial *serial = urb->context;
+	struct usb_ctrlrequest *req;
+	int status = urb->status;
+	unsigned long flags;
+
+	/* sanity check */
+	if (!serial)
+		return;
+
+	spin_lock_irqsave(&serial->serial_lock, flags);
+	serial->tx_urb_used = 0;
+	spin_unlock_irqrestore(&serial->serial_lock, flags);
+	if (status) {
+		handle_usb_error(status, __func__, serial->parent);
+		return;
+	}
+
+	/* what request? */
+	req = (struct usb_ctrlrequest *)(urb->setup_packet);
+	hso_dbg(0x8, "--- Got muxed ctrl callback 0x%02X ---\n", status);
+	hso_dbg(0x8, "Actual length of urb = %d\n", urb->actual_length);
+	DUMP1(urb->transfer_buffer, urb->actual_length);
+
+	if (req->bRequestType ==
+	    (USB_DIR_IN | USB_TYPE_OPTION_VENDOR | USB_RECIP_INTERFACE)) {
+		/* response to a read command */
+		serial->rx_urb_filled[0] = 1;
+		spin_lock_irqsave(&serial->serial_lock, flags);
+		put_rxbuf_data_and_resubmit_ctrl_urb(serial);
+		spin_unlock_irqrestore(&serial->serial_lock, flags);
+	} else {
+		hso_put_activity(serial->parent);
+		tty_port_tty_wakeup(&serial->port);
+		/* response to a write command */
+		hso_kick_transmit(serial);
+	}
+}
+
+/* handle RX data for serial port */
+static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial)
+{
+	struct tty_struct *tty;
+	int count;
+
+	/* Sanity check */
+	if (urb == NULL || serial == NULL) {
+		hso_dbg(0x1, "serial = NULL\n");
+		return -2;
+	}
+
+	tty = tty_port_tty_get(&serial->port);
+
+	if (tty && tty_throttled(tty)) {
+		tty_kref_put(tty);
+		return -1;
+	}
+
+	/* Push data to tty */
+	hso_dbg(0x1, "data to push to tty\n");
+	count = tty_buffer_request_room(&serial->port, urb->actual_length);
+	if (count >= urb->actual_length) {
+		tty_insert_flip_string(&serial->port, urb->transfer_buffer,
+				       urb->actual_length);
+		tty_flip_buffer_push(&serial->port);
+	} else {
+		dev_warn(&serial->parent->usb->dev,
+			 "dropping data, %d bytes lost\n", urb->actual_length);
+	}
+
+	tty_kref_put(tty);
+
+	serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 0;
+
+	return 0;
+}
+
+
+/* Base driver functions */
+
+static void hso_log_port(struct hso_device *hso_dev)
+{
+	char *port_type;
+	char port_dev[20];
+
+	switch (hso_dev->port_spec & HSO_PORT_MASK) {
+	case HSO_PORT_CONTROL:
+		port_type = "Control";
+		break;
+	case HSO_PORT_APP:
+		port_type = "Application";
+		break;
+	case HSO_PORT_GPS:
+		port_type = "GPS";
+		break;
+	case HSO_PORT_GPS_CONTROL:
+		port_type = "GPS control";
+		break;
+	case HSO_PORT_APP2:
+		port_type = "Application2";
+		break;
+	case HSO_PORT_PCSC:
+		port_type = "PCSC";
+		break;
+	case HSO_PORT_DIAG:
+		port_type = "Diagnostic";
+		break;
+	case HSO_PORT_DIAG2:
+		port_type = "Diagnostic2";
+		break;
+	case HSO_PORT_MODEM:
+		port_type = "Modem";
+		break;
+	case HSO_PORT_NETWORK:
+		port_type = "Network";
+		break;
+	default:
+		port_type = "Unknown";
+		break;
+	}
+	if ((hso_dev->port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
+		sprintf(port_dev, "%s", dev2net(hso_dev)->net->name);
+	} else
+		sprintf(port_dev, "/dev/%s%d", tty_filename,
+			dev2ser(hso_dev)->minor);
+
+	dev_dbg(&hso_dev->interface->dev, "HSO: Found %s port %s\n",
+		port_type, port_dev);
+}
+
+static int hso_start_net_device(struct hso_device *hso_dev)
+{
+	int i, result = 0;
+	struct hso_net *hso_net = dev2net(hso_dev);
+
+	if (!hso_net)
+		return -ENODEV;
+
+	/* send URBs for all read buffers */
+	for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
+
+		/* Prep a receive URB */
+		usb_fill_bulk_urb(hso_net->mux_bulk_rx_urb_pool[i],
+				  hso_dev->usb,
+				  usb_rcvbulkpipe(hso_dev->usb,
+						  hso_net->in_endp->
+						  bEndpointAddress & 0x7F),
+				  hso_net->mux_bulk_rx_buf_pool[i],
+				  MUX_BULK_RX_BUF_SIZE, read_bulk_callback,
+				  hso_net);
+
+		/* Put it out there so the device can send us stuff */
+		result = usb_submit_urb(hso_net->mux_bulk_rx_urb_pool[i],
+					GFP_NOIO);
+		if (result)
+			dev_warn(&hso_dev->usb->dev,
+				"%s failed mux_bulk_rx_urb[%d] %d\n", __func__,
+				i, result);
+	}
+
+	return result;
+}
+
+static int hso_stop_net_device(struct hso_device *hso_dev)
+{
+	int i;
+	struct hso_net *hso_net = dev2net(hso_dev);
+
+	if (!hso_net)
+		return -ENODEV;
+
+	for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
+		if (hso_net->mux_bulk_rx_urb_pool[i])
+			usb_kill_urb(hso_net->mux_bulk_rx_urb_pool[i]);
+
+	}
+	if (hso_net->mux_bulk_tx_urb)
+		usb_kill_urb(hso_net->mux_bulk_tx_urb);
+
+	return 0;
+}
+
+static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags)
+{
+	int i, result = 0;
+	struct hso_serial *serial = dev2ser(hso_dev);
+
+	if (!serial)
+		return -ENODEV;
+
+	/* If it is not the MUX port fill in and submit a bulk urb (already
+	 * allocated in hso_serial_start) */
+	if (!(serial->parent->port_spec & HSO_INTF_MUX)) {
+		for (i = 0; i < serial->num_rx_urbs; i++) {
+			usb_fill_bulk_urb(serial->rx_urb[i],
+					  serial->parent->usb,
+					  usb_rcvbulkpipe(serial->parent->usb,
+							  serial->in_endp->
+							  bEndpointAddress &
+							  0x7F),
+					  serial->rx_data[i],
+					  serial->rx_data_length,
+					  hso_std_serial_read_bulk_callback,
+					  serial);
+			result = usb_submit_urb(serial->rx_urb[i], flags);
+			if (result) {
+				dev_warn(&serial->parent->usb->dev,
+					 "Failed to submit urb - res %d\n",
+					 result);
+				break;
+			}
+		}
+	} else {
+		mutex_lock(&serial->shared_int->shared_int_lock);
+		if (!serial->shared_int->use_count) {
+			result =
+			    hso_mux_submit_intr_urb(serial->shared_int,
+						    hso_dev->usb, flags);
+		}
+		serial->shared_int->use_count++;
+		mutex_unlock(&serial->shared_int->shared_int_lock);
+	}
+	if (serial->tiocmget)
+		tiocmget_submit_urb(serial,
+				    serial->tiocmget,
+				    serial->parent->usb);
+	return result;
+}
+
+static int hso_stop_serial_device(struct hso_device *hso_dev)
+{
+	int i;
+	struct hso_serial *serial = dev2ser(hso_dev);
+	struct hso_tiocmget  *tiocmget;
+
+	if (!serial)
+		return -ENODEV;
+
+	for (i = 0; i < serial->num_rx_urbs; i++) {
+		if (serial->rx_urb[i]) {
+			usb_kill_urb(serial->rx_urb[i]);
+			serial->rx_urb_filled[i] = 0;
+		}
+	}
+	serial->curr_rx_urb_idx = 0;
+
+	if (serial->tx_urb)
+		usb_kill_urb(serial->tx_urb);
+
+	if (serial->shared_int) {
+		mutex_lock(&serial->shared_int->shared_int_lock);
+		if (serial->shared_int->use_count &&
+		    (--serial->shared_int->use_count == 0)) {
+			struct urb *urb;
+
+			urb = serial->shared_int->shared_intr_urb;
+			if (urb)
+				usb_kill_urb(urb);
+		}
+		mutex_unlock(&serial->shared_int->shared_int_lock);
+	}
+	tiocmget = serial->tiocmget;
+	if (tiocmget) {
+		wake_up_interruptible(&tiocmget->waitq);
+		usb_kill_urb(tiocmget->urb);
+	}
+
+	return 0;
+}
+
+static void hso_serial_tty_unregister(struct hso_serial *serial)
+{
+	tty_unregister_device(tty_drv, serial->minor);
+	release_minor(serial);
+}
+
+static void hso_serial_common_free(struct hso_serial *serial)
+{
+	int i;
+
+	for (i = 0; i < serial->num_rx_urbs; i++) {
+		/* unlink and free RX URB */
+		usb_free_urb(serial->rx_urb[i]);
+		/* free the RX buffer */
+		kfree(serial->rx_data[i]);
+	}
+
+	/* unlink and free TX URB */
+	usb_free_urb(serial->tx_urb);
+	kfree(serial->tx_buffer);
+	kfree(serial->tx_data);
+	tty_port_destroy(&serial->port);
+}
+
+static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
+				    int rx_size, int tx_size)
+{
+	int i;
+
+	tty_port_init(&serial->port);
+
+	if (obtain_minor(serial))
+		goto exit2;
+
+	/* register our minor number */
+	serial->parent->dev = tty_port_register_device_attr(&serial->port,
+			tty_drv, serial->minor, &serial->parent->interface->dev,
+			serial->parent, hso_serial_dev_groups);
+	if (IS_ERR(serial->parent->dev)) {
+		release_minor(serial);
+		goto exit2;
+	}
+
+	serial->magic = HSO_SERIAL_MAGIC;
+	spin_lock_init(&serial->serial_lock);
+	serial->num_rx_urbs = num_urbs;
+
+	/* RX, allocate urb and initialize */
+
+	/* prepare our RX buffer */
+	serial->rx_data_length = rx_size;
+	for (i = 0; i < serial->num_rx_urbs; i++) {
+		serial->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
+		if (!serial->rx_urb[i])
+			goto exit;
+		serial->rx_urb[i]->transfer_buffer = NULL;
+		serial->rx_urb[i]->transfer_buffer_length = 0;
+		serial->rx_data[i] = kzalloc(serial->rx_data_length,
+					     GFP_KERNEL);
+		if (!serial->rx_data[i])
+			goto exit;
+	}
+
+	/* TX, allocate urb and initialize */
+	serial->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!serial->tx_urb)
+		goto exit;
+	serial->tx_urb->transfer_buffer = NULL;
+	serial->tx_urb->transfer_buffer_length = 0;
+	/* prepare our TX buffer */
+	serial->tx_data_count = 0;
+	serial->tx_buffer_count = 0;
+	serial->tx_data_length = tx_size;
+	serial->tx_data = kzalloc(serial->tx_data_length, GFP_KERNEL);
+	if (!serial->tx_data)
+		goto exit;
+
+	serial->tx_buffer = kzalloc(serial->tx_data_length, GFP_KERNEL);
+	if (!serial->tx_buffer)
+		goto exit;
+
+	return 0;
+exit:
+	hso_serial_tty_unregister(serial);
+exit2:
+	hso_serial_common_free(serial);
+	return -1;
+}
+
+/* Creates a general hso device */
+static struct hso_device *hso_create_device(struct usb_interface *intf,
+					    int port_spec)
+{
+	struct hso_device *hso_dev;
+
+	hso_dev = kzalloc(sizeof(*hso_dev), GFP_KERNEL);
+	if (!hso_dev)
+		return NULL;
+
+	hso_dev->port_spec = port_spec;
+	hso_dev->usb = interface_to_usbdev(intf);
+	hso_dev->interface = intf;
+	kref_init(&hso_dev->ref);
+	mutex_init(&hso_dev->mutex);
+
+	INIT_WORK(&hso_dev->async_get_intf, async_get_intf);
+	INIT_WORK(&hso_dev->async_put_intf, async_put_intf);
+
+	return hso_dev;
+}
+
+/* Removes a network device in the network device table */
+static int remove_net_device(struct hso_device *hso_dev)
+{
+	int i;
+
+	for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
+		if (network_table[i] == hso_dev) {
+			network_table[i] = NULL;
+			break;
+		}
+	}
+	if (i == HSO_MAX_NET_DEVICES)
+		return -1;
+	return 0;
+}
+
+/* Frees our network device */
+static void hso_free_net_device(struct hso_device *hso_dev)
+{
+	int i;
+	struct hso_net *hso_net = dev2net(hso_dev);
+
+	if (!hso_net)
+		return;
+
+	remove_net_device(hso_net->parent);
+
+	if (hso_net->net)
+		unregister_netdev(hso_net->net);
+
+	/* start freeing */
+	for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
+		usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
+		kfree(hso_net->mux_bulk_rx_buf_pool[i]);
+		hso_net->mux_bulk_rx_buf_pool[i] = NULL;
+	}
+	usb_free_urb(hso_net->mux_bulk_tx_urb);
+	kfree(hso_net->mux_bulk_tx_buf);
+	hso_net->mux_bulk_tx_buf = NULL;
+
+	if (hso_net->net)
+		free_netdev(hso_net->net);
+
+	kfree(hso_dev);
+}
+
+static const struct net_device_ops hso_netdev_ops = {
+	.ndo_open	= hso_net_open,
+	.ndo_stop	= hso_net_close,
+	.ndo_start_xmit = hso_net_start_xmit,
+	.ndo_tx_timeout = hso_net_tx_timeout,
+};
+
+/* initialize the network interface */
+static void hso_net_init(struct net_device *net)
+{
+	struct hso_net *hso_net = netdev_priv(net);
+
+	hso_dbg(0x1, "sizeof hso_net is %zu\n", sizeof(*hso_net));
+
+	/* fill in the other fields */
+	net->netdev_ops = &hso_netdev_ops;
+	net->watchdog_timeo = HSO_NET_TX_TIMEOUT;
+	net->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
+	net->type = ARPHRD_NONE;
+	net->mtu = DEFAULT_MTU - 14;
+	net->tx_queue_len = 10;
+	net->ethtool_ops = &ops;
+
+	/* and initialize the semaphore */
+	spin_lock_init(&hso_net->net_lock);
+}
+
+/* Adds a network device in the network device table */
+static int add_net_device(struct hso_device *hso_dev)
+{
+	int i;
+
+	for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
+		if (network_table[i] == NULL) {
+			network_table[i] = hso_dev;
+			break;
+		}
+	}
+	if (i == HSO_MAX_NET_DEVICES)
+		return -1;
+	return 0;
+}
+
+static int hso_rfkill_set_block(void *data, bool blocked)
+{
+	struct hso_device *hso_dev = data;
+	int enabled = !blocked;
+	int rv;
+
+	mutex_lock(&hso_dev->mutex);
+	if (hso_dev->usb_gone)
+		rv = 0;
+	else
+		rv = usb_control_msg(hso_dev->usb, usb_sndctrlpipe(hso_dev->usb, 0),
+				       enabled ? 0x82 : 0x81, 0x40, 0, 0, NULL, 0,
+				       USB_CTRL_SET_TIMEOUT);
+	mutex_unlock(&hso_dev->mutex);
+	return rv;
+}
+
+static const struct rfkill_ops hso_rfkill_ops = {
+	.set_block = hso_rfkill_set_block,
+};
+
+/* Creates and sets up everything for rfkill */
+static void hso_create_rfkill(struct hso_device *hso_dev,
+			     struct usb_interface *interface)
+{
+	struct hso_net *hso_net = dev2net(hso_dev);
+	struct device *dev = &hso_net->net->dev;
+	static u32 rfkill_counter;
+
+	snprintf(hso_net->name, sizeof(hso_net->name), "hso-%d",
+		 rfkill_counter++);
+
+	hso_net->rfkill = rfkill_alloc(hso_net->name,
+				       &interface_to_usbdev(interface)->dev,
+				       RFKILL_TYPE_WWAN,
+				       &hso_rfkill_ops, hso_dev);
+	if (!hso_net->rfkill)
+		return;
+
+	if (rfkill_register(hso_net->rfkill) < 0) {
+		rfkill_destroy(hso_net->rfkill);
+		hso_net->rfkill = NULL;
+		dev_err(dev, "%s - Failed to register rfkill\n", __func__);
+		return;
+	}
+}
+
+static struct device_type hso_type = {
+	.name	= "wwan",
+};
+
+/* Creates our network device */
+static struct hso_device *hso_create_net_device(struct usb_interface *interface,
+						int port_spec)
+{
+	int result, i;
+	struct net_device *net;
+	struct hso_net *hso_net;
+	struct hso_device *hso_dev;
+
+	hso_dev = hso_create_device(interface, port_spec);
+	if (!hso_dev)
+		return NULL;
+
+	/* allocate our network device, then we can put in our private data */
+	/* call hso_net_init to do the basic initialization */
+	net = alloc_netdev(sizeof(struct hso_net), "hso%d", NET_NAME_UNKNOWN,
+			   hso_net_init);
+	if (!net) {
+		dev_err(&interface->dev, "Unable to create ethernet device\n");
+		goto err_hso_dev;
+	}
+
+	hso_net = netdev_priv(net);
+
+	hso_dev->port_data.dev_net = hso_net;
+	hso_net->net = net;
+	hso_net->parent = hso_dev;
+
+	hso_net->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
+				      USB_DIR_IN);
+	if (!hso_net->in_endp) {
+		dev_err(&interface->dev, "Can't find BULK IN endpoint\n");
+		goto err_net;
+	}
+	hso_net->out_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
+				       USB_DIR_OUT);
+	if (!hso_net->out_endp) {
+		dev_err(&interface->dev, "Can't find BULK OUT endpoint\n");
+		goto err_net;
+	}
+	SET_NETDEV_DEV(net, &interface->dev);
+	SET_NETDEV_DEVTYPE(net, &hso_type);
+
+	/* start allocating */
+	for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
+		hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL);
+		if (!hso_net->mux_bulk_rx_urb_pool[i])
+			goto err_mux_bulk_rx;
+		hso_net->mux_bulk_rx_buf_pool[i] = kzalloc(MUX_BULK_RX_BUF_SIZE,
+							   GFP_KERNEL);
+		if (!hso_net->mux_bulk_rx_buf_pool[i])
+			goto err_mux_bulk_rx;
+	}
+	hso_net->mux_bulk_tx_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!hso_net->mux_bulk_tx_urb)
+		goto err_mux_bulk_rx;
+	hso_net->mux_bulk_tx_buf = kzalloc(MUX_BULK_TX_BUF_SIZE, GFP_KERNEL);
+	if (!hso_net->mux_bulk_tx_buf)
+		goto err_free_tx_urb;
+
+	result = add_net_device(hso_dev);
+	if (result) {
+		dev_err(&interface->dev, "Failed to add net device\n");
+		goto err_free_tx_buf;
+	}
+
+	/* registering our net device */
+	result = register_netdev(net);
+	if (result) {
+		dev_err(&interface->dev, "Failed to register device\n");
+		goto err_rmv_ndev;
+	}
+
+	hso_log_port(hso_dev);
+
+	hso_create_rfkill(hso_dev, interface);
+
+	return hso_dev;
+
+err_rmv_ndev:
+	remove_net_device(hso_dev);
+err_free_tx_buf:
+	kfree(hso_net->mux_bulk_tx_buf);
+err_free_tx_urb:
+	usb_free_urb(hso_net->mux_bulk_tx_urb);
+err_mux_bulk_rx:
+	for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
+		usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
+		kfree(hso_net->mux_bulk_rx_buf_pool[i]);
+	}
+err_net:
+	free_netdev(net);
+err_hso_dev:
+	kfree(hso_dev);
+	return NULL;
+}
+
+static void hso_free_tiomget(struct hso_serial *serial)
+{
+	struct hso_tiocmget *tiocmget;
+	if (!serial)
+		return;
+	tiocmget = serial->tiocmget;
+	if (tiocmget) {
+		usb_free_urb(tiocmget->urb);
+		tiocmget->urb = NULL;
+		serial->tiocmget = NULL;
+		kfree(tiocmget->serial_state_notification);
+		tiocmget->serial_state_notification = NULL;
+		kfree(tiocmget);
+	}
+}
+
+/* Frees an AT channel ( goes for both mux and non-mux ) */
+static void hso_free_serial_device(struct hso_device *hso_dev)
+{
+	struct hso_serial *serial = dev2ser(hso_dev);
+
+	if (!serial)
+		return;
+
+	hso_serial_common_free(serial);
+
+	if (serial->shared_int) {
+		mutex_lock(&serial->shared_int->shared_int_lock);
+		if (--serial->shared_int->ref_count == 0)
+			hso_free_shared_int(serial->shared_int);
+		else
+			mutex_unlock(&serial->shared_int->shared_int_lock);
+	}
+	hso_free_tiomget(serial);
+	kfree(serial);
+	kfree(hso_dev);
+}
+
+/* Creates a bulk AT channel */
+static struct hso_device *hso_create_bulk_serial_device(
+			struct usb_interface *interface, int port)
+{
+	struct hso_device *hso_dev;
+	struct hso_serial *serial;
+	int num_urbs;
+	struct hso_tiocmget *tiocmget;
+
+	hso_dev = hso_create_device(interface, port);
+	if (!hso_dev)
+		return NULL;
+
+	serial = kzalloc(sizeof(*serial), GFP_KERNEL);
+	if (!serial)
+		goto exit;
+
+	serial->parent = hso_dev;
+	hso_dev->port_data.dev_serial = serial;
+
+	if ((port & HSO_PORT_MASK) == HSO_PORT_MODEM) {
+		num_urbs = 2;
+		serial->tiocmget = kzalloc(sizeof(struct hso_tiocmget),
+					   GFP_KERNEL);
+		if (!serial->tiocmget)
+			goto exit;
+		serial->tiocmget->serial_state_notification
+			= kzalloc(sizeof(struct hso_serial_state_notification),
+					   GFP_KERNEL);
+		if (!serial->tiocmget->serial_state_notification)
+			goto exit;
+		tiocmget = serial->tiocmget;
+		tiocmget->endp = hso_get_ep(interface,
+					    USB_ENDPOINT_XFER_INT,
+					    USB_DIR_IN);
+		if (!tiocmget->endp) {
+			dev_err(&interface->dev, "Failed to find INT IN ep\n");
+			goto exit;
+		}
+
+		tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!tiocmget->urb)
+			goto exit;
+
+		mutex_init(&tiocmget->mutex);
+		init_waitqueue_head(&tiocmget->waitq);
+	} else {
+		num_urbs = 1;
+	}
+
+	if (hso_serial_common_create(serial, num_urbs, BULK_URB_RX_SIZE,
+				     BULK_URB_TX_SIZE))
+		goto exit;
+
+	serial->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
+				     USB_DIR_IN);
+	if (!serial->in_endp) {
+		dev_err(&interface->dev, "Failed to find BULK IN ep\n");
+		goto exit2;
+	}
+
+	if (!
+	    (serial->out_endp =
+	     hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, USB_DIR_OUT))) {
+		dev_err(&interface->dev, "Failed to find BULK OUT ep\n");
+		goto exit2;
+	}
+
+	serial->write_data = hso_std_serial_write_data;
+
+	/* setup the proc dirs and files if needed */
+	hso_log_port(hso_dev);
+
+	/* done, return it */
+	return hso_dev;
+
+exit2:
+	hso_serial_tty_unregister(serial);
+	hso_serial_common_free(serial);
+exit:
+	hso_free_tiomget(serial);
+	kfree(serial);
+	kfree(hso_dev);
+	return NULL;
+}
+
+/* Creates a multiplexed AT channel */
+static
+struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface,
+						int port,
+						struct hso_shared_int *mux)
+{
+	struct hso_device *hso_dev;
+	struct hso_serial *serial;
+	int port_spec;
+
+	port_spec = HSO_INTF_MUX;
+	port_spec &= ~HSO_PORT_MASK;
+
+	port_spec |= hso_mux_to_port(port);
+	if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NO_PORT)
+		return NULL;
+
+	hso_dev = hso_create_device(interface, port_spec);
+	if (!hso_dev)
+		return NULL;
+
+	serial = kzalloc(sizeof(*serial), GFP_KERNEL);
+	if (!serial)
+		goto err_free_dev;
+
+	hso_dev->port_data.dev_serial = serial;
+	serial->parent = hso_dev;
+
+	if (hso_serial_common_create
+	    (serial, 1, CTRL_URB_RX_SIZE, CTRL_URB_TX_SIZE))
+		goto err_free_serial;
+
+	serial->tx_data_length--;
+	serial->write_data = hso_mux_serial_write_data;
+
+	serial->shared_int = mux;
+	mutex_lock(&serial->shared_int->shared_int_lock);
+	serial->shared_int->ref_count++;
+	mutex_unlock(&serial->shared_int->shared_int_lock);
+
+	/* setup the proc dirs and files if needed */
+	hso_log_port(hso_dev);
+
+	/* done, return it */
+	return hso_dev;
+
+err_free_serial:
+	kfree(serial);
+err_free_dev:
+	kfree(hso_dev);
+	return NULL;
+
+}
+
+static void hso_free_shared_int(struct hso_shared_int *mux)
+{
+	usb_free_urb(mux->shared_intr_urb);
+	kfree(mux->shared_intr_buf);
+	mutex_unlock(&mux->shared_int_lock);
+	kfree(mux);
+}
+
+static
+struct hso_shared_int *hso_create_shared_int(struct usb_interface *interface)
+{
+	struct hso_shared_int *mux = kzalloc(sizeof(*mux), GFP_KERNEL);
+
+	if (!mux)
+		return NULL;
+
+	mux->intr_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_INT,
+				    USB_DIR_IN);
+	if (!mux->intr_endp) {
+		dev_err(&interface->dev, "Can't find INT IN endpoint\n");
+		goto exit;
+	}
+
+	mux->shared_intr_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!mux->shared_intr_urb)
+		goto exit;
+	mux->shared_intr_buf =
+		kzalloc(le16_to_cpu(mux->intr_endp->wMaxPacketSize),
+			GFP_KERNEL);
+	if (!mux->shared_intr_buf)
+		goto exit;
+
+	mutex_init(&mux->shared_int_lock);
+
+	return mux;
+
+exit:
+	kfree(mux->shared_intr_buf);
+	usb_free_urb(mux->shared_intr_urb);
+	kfree(mux);
+	return NULL;
+}
+
+/* Gets the port spec for a certain interface */
+static int hso_get_config_data(struct usb_interface *interface)
+{
+	struct usb_device *usbdev = interface_to_usbdev(interface);
+	u8 *config_data = kmalloc(17, GFP_KERNEL);
+	u32 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
+	s32 result;
+
+	if (!config_data)
+		return -ENOMEM;
+	if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
+			    0x86, 0xC0, 0, 0, config_data, 17,
+			    USB_CTRL_SET_TIMEOUT) != 0x11) {
+		kfree(config_data);
+		return -EIO;
+	}
+
+	/* check if we have a valid interface */
+	if (if_num > 16) {
+		kfree(config_data);
+		return -EINVAL;
+	}
+
+	switch (config_data[if_num]) {
+	case 0x0:
+		result = 0;
+		break;
+	case 0x1:
+		result = HSO_PORT_DIAG;
+		break;
+	case 0x2:
+		result = HSO_PORT_GPS;
+		break;
+	case 0x3:
+		result = HSO_PORT_GPS_CONTROL;
+		break;
+	case 0x4:
+		result = HSO_PORT_APP;
+		break;
+	case 0x5:
+		result = HSO_PORT_APP2;
+		break;
+	case 0x6:
+		result = HSO_PORT_CONTROL;
+		break;
+	case 0x7:
+		result = HSO_PORT_NETWORK;
+		break;
+	case 0x8:
+		result = HSO_PORT_MODEM;
+		break;
+	case 0x9:
+		result = HSO_PORT_MSD;
+		break;
+	case 0xa:
+		result = HSO_PORT_PCSC;
+		break;
+	case 0xb:
+		result = HSO_PORT_VOICE;
+		break;
+	default:
+		result = 0;
+	}
+
+	if (result)
+		result |= HSO_INTF_BULK;
+
+	if (config_data[16] & 0x1)
+		result |= HSO_INFO_CRC_BUG;
+
+	kfree(config_data);
+	return result;
+}
+
+/* called once for each interface upon device insertion */
+static int hso_probe(struct usb_interface *interface,
+		     const struct usb_device_id *id)
+{
+	int mux, i, if_num, port_spec;
+	unsigned char port_mask;
+	struct hso_device *hso_dev = NULL;
+	struct hso_shared_int *shared_int;
+	struct hso_device *tmp_dev = NULL;
+
+	if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
+		dev_err(&interface->dev, "Not our interface\n");
+		return -ENODEV;
+	}
+
+	if_num = interface->cur_altsetting->desc.bInterfaceNumber;
+
+	/* Get the interface/port specification from either driver_info or from
+	 * the device itself */
+	if (id->driver_info) {
+		/* if_num is controlled by the device, driver_info is a 0 terminated
+		 * array. Make sure, the access is in bounds! */
+		for (i = 0; i <= if_num; ++i)
+			if (((u32 *)(id->driver_info))[i] == 0)
+				goto exit;
+		port_spec = ((u32 *)(id->driver_info))[if_num];
+	} else {
+		port_spec = hso_get_config_data(interface);
+		if (port_spec < 0)
+			goto exit;
+	}
+
+	/* Check if we need to switch to alt interfaces prior to port
+	 * configuration */
+	if (interface->num_altsetting > 1)
+		usb_set_interface(interface_to_usbdev(interface), if_num, 1);
+	interface->needs_remote_wakeup = 1;
+
+	/* Allocate new hso device(s) */
+	switch (port_spec & HSO_INTF_MASK) {
+	case HSO_INTF_MUX:
+		if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
+			/* Create the network device */
+			if (!disable_net) {
+				hso_dev = hso_create_net_device(interface,
+								port_spec);
+				if (!hso_dev)
+					goto exit;
+				tmp_dev = hso_dev;
+			}
+		}
+
+		if (hso_get_mux_ports(interface, &port_mask))
+			/* TODO: de-allocate everything */
+			goto exit;
+
+		shared_int = hso_create_shared_int(interface);
+		if (!shared_int)
+			goto exit;
+
+		for (i = 1, mux = 0; i < 0x100; i = i << 1, mux++) {
+			if (port_mask & i) {
+				hso_dev = hso_create_mux_serial_device(
+						interface, i, shared_int);
+				if (!hso_dev)
+					goto exit;
+			}
+		}
+
+		if (tmp_dev)
+			hso_dev = tmp_dev;
+		break;
+
+	case HSO_INTF_BULK:
+		/* It's a regular bulk interface */
+		if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
+			if (!disable_net)
+				hso_dev =
+				    hso_create_net_device(interface, port_spec);
+		} else {
+			hso_dev =
+			    hso_create_bulk_serial_device(interface, port_spec);
+		}
+		if (!hso_dev)
+			goto exit;
+		break;
+	default:
+		goto exit;
+	}
+
+	/* save our data pointer in this device */
+	usb_set_intfdata(interface, hso_dev);
+
+	/* done */
+	return 0;
+exit:
+	hso_free_interface(interface);
+	return -ENODEV;
+}
+
+/* device removed, cleaning up */
+static void hso_disconnect(struct usb_interface *interface)
+{
+	hso_free_interface(interface);
+
+	/* remove reference of our private data */
+	usb_set_intfdata(interface, NULL);
+}
+
+static void async_get_intf(struct work_struct *data)
+{
+	struct hso_device *hso_dev =
+	    container_of(data, struct hso_device, async_get_intf);
+	usb_autopm_get_interface(hso_dev->interface);
+}
+
+static void async_put_intf(struct work_struct *data)
+{
+	struct hso_device *hso_dev =
+	    container_of(data, struct hso_device, async_put_intf);
+	usb_autopm_put_interface(hso_dev->interface);
+}
+
+static int hso_get_activity(struct hso_device *hso_dev)
+{
+	if (hso_dev->usb->state == USB_STATE_SUSPENDED) {
+		if (!hso_dev->is_active) {
+			hso_dev->is_active = 1;
+			schedule_work(&hso_dev->async_get_intf);
+		}
+	}
+
+	if (hso_dev->usb->state != USB_STATE_CONFIGURED)
+		return -EAGAIN;
+
+	usb_mark_last_busy(hso_dev->usb);
+
+	return 0;
+}
+
+static int hso_put_activity(struct hso_device *hso_dev)
+{
+	if (hso_dev->usb->state != USB_STATE_SUSPENDED) {
+		if (hso_dev->is_active) {
+			hso_dev->is_active = 0;
+			schedule_work(&hso_dev->async_put_intf);
+			return -EAGAIN;
+		}
+	}
+	hso_dev->is_active = 0;
+	return 0;
+}
+
+/* called by kernel when we need to suspend device */
+static int hso_suspend(struct usb_interface *iface, pm_message_t message)
+{
+	int i, result;
+
+	/* Stop all serial ports */
+	for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
+		if (serial_table[i] && (serial_table[i]->interface == iface)) {
+			result = hso_stop_serial_device(serial_table[i]);
+			if (result)
+				goto out;
+		}
+	}
+
+	/* Stop all network ports */
+	for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
+		if (network_table[i] &&
+		    (network_table[i]->interface == iface)) {
+			result = hso_stop_net_device(network_table[i]);
+			if (result)
+				goto out;
+		}
+	}
+
+out:
+	return 0;
+}
+
+/* called by kernel when we need to resume device */
+static int hso_resume(struct usb_interface *iface)
+{
+	int i, result = 0;
+	struct hso_net *hso_net;
+
+	/* Start all serial ports */
+	for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
+		if (serial_table[i] && (serial_table[i]->interface == iface)) {
+			if (dev2ser(serial_table[i])->port.count) {
+				result =
+				    hso_start_serial_device(serial_table[i], GFP_NOIO);
+				hso_kick_transmit(dev2ser(serial_table[i]));
+				if (result)
+					goto out;
+			}
+		}
+	}
+
+	/* Start all network ports */
+	for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
+		if (network_table[i] &&
+		    (network_table[i]->interface == iface)) {
+			hso_net = dev2net(network_table[i]);
+			if (hso_net->flags & IFF_UP) {
+				/* First transmit any lingering data,
+				   then restart the device. */
+				if (hso_net->skb_tx_buf) {
+					dev_dbg(&iface->dev,
+						"Transmitting"
+						" lingering data\n");
+					hso_net_start_xmit(hso_net->skb_tx_buf,
+							   hso_net->net);
+					hso_net->skb_tx_buf = NULL;
+				}
+				result = hso_start_net_device(network_table[i]);
+				if (result)
+					goto out;
+			}
+		}
+	}
+
+out:
+	return result;
+}
+
+static void hso_serial_ref_free(struct kref *ref)
+{
+	struct hso_device *hso_dev = container_of(ref, struct hso_device, ref);
+
+	hso_free_serial_device(hso_dev);
+}
+
+static void hso_free_interface(struct usb_interface *interface)
+{
+	struct hso_serial *serial;
+	int i;
+
+	for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
+		if (serial_table[i] &&
+		    (serial_table[i]->interface == interface)) {
+			serial = dev2ser(serial_table[i]);
+			tty_port_tty_hangup(&serial->port, false);
+			mutex_lock(&serial->parent->mutex);
+			serial->parent->usb_gone = 1;
+			mutex_unlock(&serial->parent->mutex);
+			cancel_work_sync(&serial_table[i]->async_put_intf);
+			cancel_work_sync(&serial_table[i]->async_get_intf);
+			hso_serial_tty_unregister(serial);
+			kref_put(&serial->parent->ref, hso_serial_ref_free);
+		}
+	}
+
+	for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
+		if (network_table[i] &&
+		    (network_table[i]->interface == interface)) {
+			struct rfkill *rfk = dev2net(network_table[i])->rfkill;
+			/* hso_stop_net_device doesn't stop the net queue since
+			 * traffic needs to start it again when suspended */
+			netif_stop_queue(dev2net(network_table[i])->net);
+			hso_stop_net_device(network_table[i]);
+			cancel_work_sync(&network_table[i]->async_put_intf);
+			cancel_work_sync(&network_table[i]->async_get_intf);
+			if (rfk) {
+				rfkill_unregister(rfk);
+				rfkill_destroy(rfk);
+			}
+			hso_free_net_device(network_table[i]);
+		}
+	}
+}
+
+/* Helper functions */
+
+/* Get the endpoint ! */
+static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
+						  int type, int dir)
+{
+	int i;
+	struct usb_host_interface *iface = intf->cur_altsetting;
+	struct usb_endpoint_descriptor *endp;
+
+	for (i = 0; i < iface->desc.bNumEndpoints; i++) {
+		endp = &iface->endpoint[i].desc;
+		if (((endp->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == dir) &&
+		    (usb_endpoint_type(endp) == type))
+			return endp;
+	}
+
+	return NULL;
+}
+
+/* Get the byte that describes which ports are enabled */
+static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports)
+{
+	int i;
+	struct usb_host_interface *iface = intf->cur_altsetting;
+
+	if (iface->extralen == 3) {
+		*ports = iface->extra[2];
+		return 0;
+	}
+
+	for (i = 0; i < iface->desc.bNumEndpoints; i++) {
+		if (iface->endpoint[i].extralen == 3) {
+			*ports = iface->endpoint[i].extra[2];
+			return 0;
+		}
+	}
+
+	return -1;
+}
+
+/* interrupt urb needs to be submitted, used for serial read of muxed port */
+static int hso_mux_submit_intr_urb(struct hso_shared_int *shared_int,
+				   struct usb_device *usb, gfp_t gfp)
+{
+	int result;
+
+	usb_fill_int_urb(shared_int->shared_intr_urb, usb,
+			 usb_rcvintpipe(usb,
+				shared_int->intr_endp->bEndpointAddress & 0x7F),
+			 shared_int->shared_intr_buf,
+			 1,
+			 intr_callback, shared_int,
+			 shared_int->intr_endp->bInterval);
+
+	result = usb_submit_urb(shared_int->shared_intr_urb, gfp);
+	if (result)
+		dev_warn(&usb->dev, "%s failed mux_intr_urb %d\n", __func__,
+			result);
+
+	return result;
+}
+
+/* operations setup of the serial interface */
+static const struct tty_operations hso_serial_ops = {
+	.open = hso_serial_open,
+	.close = hso_serial_close,
+	.write = hso_serial_write,
+	.write_room = hso_serial_write_room,
+	.cleanup = hso_serial_cleanup,
+	.ioctl = hso_serial_ioctl,
+	.set_termios = hso_serial_set_termios,
+	.chars_in_buffer = hso_serial_chars_in_buffer,
+	.tiocmget = hso_serial_tiocmget,
+	.tiocmset = hso_serial_tiocmset,
+	.get_icount = hso_get_count,
+	.unthrottle = hso_unthrottle
+};
+
+static struct usb_driver hso_driver = {
+	.name = driver_name,
+	.probe = hso_probe,
+	.disconnect = hso_disconnect,
+	.id_table = hso_ids,
+	.suspend = hso_suspend,
+	.resume = hso_resume,
+	.reset_resume = hso_resume,
+	.supports_autosuspend = 1,
+	.disable_hub_initiated_lpm = 1,
+};
+
+static int __init hso_init(void)
+{
+	int i;
+	int result;
+
+	/* put it in the log */
+	pr_info("%s\n", version);
+
+	/* Initialise the serial table semaphore and table */
+	for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++)
+		serial_table[i] = NULL;
+
+	/* allocate our driver using the proper amount of supported minors */
+	tty_drv = tty_alloc_driver(HSO_SERIAL_TTY_MINORS, TTY_DRIVER_REAL_RAW |
+			TTY_DRIVER_DYNAMIC_DEV);
+	if (IS_ERR(tty_drv))
+		return PTR_ERR(tty_drv);
+
+	/* fill in all needed values */
+	tty_drv->driver_name = driver_name;
+	tty_drv->name = tty_filename;
+
+	/* if major number is provided as parameter, use that one */
+	if (tty_major)
+		tty_drv->major = tty_major;
+
+	tty_drv->minor_start = 0;
+	tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
+	tty_drv->subtype = SERIAL_TYPE_NORMAL;
+	tty_drv->init_termios = tty_std_termios;
+	hso_init_termios(&tty_drv->init_termios);
+	tty_set_operations(tty_drv, &hso_serial_ops);
+
+	/* register the tty driver */
+	result = tty_register_driver(tty_drv);
+	if (result) {
+		pr_err("%s - tty_register_driver failed(%d)\n",
+		       __func__, result);
+		goto err_free_tty;
+	}
+
+	/* register this module as an usb driver */
+	result = usb_register(&hso_driver);
+	if (result) {
+		pr_err("Could not register hso driver - error: %d\n", result);
+		goto err_unreg_tty;
+	}
+
+	/* done */
+	return 0;
+err_unreg_tty:
+	tty_unregister_driver(tty_drv);
+err_free_tty:
+	tty_driver_kref_put(tty_drv);
+	return result;
+}
+
+static void __exit hso_exit(void)
+{
+	pr_info("unloaded\n");
+
+	tty_unregister_driver(tty_drv);
+	/* deregister the usb driver */
+	usb_deregister(&hso_driver);
+	tty_driver_kref_put(tty_drv);
+}
+
+/* Module definitions */
+module_init(hso_init);
+module_exit(hso_exit);
+
+MODULE_AUTHOR(MOD_AUTHOR);
+MODULE_DESCRIPTION(MOD_DESCRIPTION);
+MODULE_LICENSE("GPL");
+
+/* change the debug level (eg: insmod hso.ko debug=0x04) */
+MODULE_PARM_DESC(debug, "debug level mask [0x01 | 0x02 | 0x04 | 0x08 | 0x10]");
+module_param(debug, int, 0644);
+
+/* set the major tty number (eg: insmod hso.ko tty_major=245) */
+MODULE_PARM_DESC(tty_major, "Set the major tty number");
+module_param(tty_major, int, 0644);
+
+/* disable network interface (eg: insmod hso.ko disable_net=1) */
+MODULE_PARM_DESC(disable_net, "Disable the network interface");
+module_param(disable_net, int, 0644);