HSO: add option hso driver

This driver is for a number of different Option devices.  Originally
written by Option and Andrew Bird, but cleaned up massivly for
acceptance into mainline by me and others.

Many thanks to the following for their help in cleaning up the driver by
providing feedback and patches to it:
	- Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
	- Oliver Neukum <oliver@neukum.org>
	- Alan Cox <alan@lxorguk.ukuu.org.uk>
	- Javier Marcet <javier@krausbeck.org>

Cc: Andrew Bird <ajb@spheresystems.co.uk>
Cc: Javier Marcet <javier@krausbeck.org>
Cc: Filip Aben <f.aben@option.com>
Cc: Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
Cc: Oliver Neukum <oliver@neukum.org>
Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

4 files changed, 2848 insertions, 0 deletions

diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index c52738a3aaa..c96fe203680 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -237,6 +237,7 @@ obj-$(CONFIG_USB_CATC)          += usb/
 obj-$(CONFIG_USB_KAWETH)        += usb/
 obj-$(CONFIG_USB_PEGASUS)       += usb/
 obj-$(CONFIG_USB_RTL8150)       += usb/
+obj-$(CONFIG_USB_HSO)		+= usb/
 obj-$(CONFIG_USB_USBNET)        += usb/
 obj-$(CONFIG_USB_ZD1201)        += usb/
 
diff --git a/drivers/net/usb/Kconfig b/drivers/net/usb/Kconfig
index 0604f3faf04..68e198bd538 100644
--- a/drivers/net/usb/Kconfig
+++ b/drivers/net/usb/Kconfig
@@ -154,6 +154,16 @@ config USB_NET_AX8817X
 	  This driver creates an interface named "ethX", where X depends on
 	  what other networking devices you have in use.
 
+config USB_HSO
+	tristate "Option USB High Speed Mobile Devices"
+	depends on USB && RFKILL
+	default n
+	help
+	  Choose this option if you have an Option HSDPA/HSUPA card.
+	  These cards support downlink speeds of 7.2Mbps or greater.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called hso.
 
 config USB_NET_CDCETHER
 	tristate "CDC Ethernet support (smart devices such as cable modems)"
diff --git a/drivers/net/usb/Makefile b/drivers/net/usb/Makefile
index 595a539f838..24800c157f9 100644
--- a/drivers/net/usb/Makefile
+++ b/drivers/net/usb/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_USB_CATC)		+= catc.o
 obj-$(CONFIG_USB_KAWETH)	+= kaweth.o
 obj-$(CONFIG_USB_PEGASUS)	+= pegasus.o
 obj-$(CONFIG_USB_RTL8150)	+= rtl8150.o
+obj-$(CONFIG_USB_HSO)		+= hso.o
 obj-$(CONFIG_USB_NET_AX8817X)	+= asix.o
 obj-$(CONFIG_USB_NET_CDCETHER)	+= cdc_ether.o
 obj-$(CONFIG_USB_NET_DM9601)	+= dm9601.o
diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
new file mode 100644
index 00000000000..031d07b105a
--- /dev/null
+++ b/drivers/net/usb/hso.c
@@ -0,0 +1,2836 @@
+/******************************************************************************
+ *
+ * Driver for Option High Speed Mobile Devices.
+ *
+ *  Copyright (C) 2008 Option International
+ *  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.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+ *  USA
+ *
+ *
+ *****************************************************************************/
+
+/******************************************************************************
+ *
+ * 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, should
+ *		not be used.
+ *
+ *****************************************************************************/
+
+#include <linux/sched.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/timer.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>
+
+
+#define DRIVER_VERSION			"1.2"
+#define MOD_AUTHOR			"Option Wireless"
+#define MOD_DESCRIPTION			"USB High Speed Option driver"
+#define MOD_LICENSE			"GPL"
+
+#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)
+
+/* Serial port defines and structs. */
+#define HSO_SERIAL_FLAG_RX_SENT		0
+
+#define HSO_SERIAL_MAGIC		0x48534f31
+
+/* Number of ttys to handle */
+#define HSO_SERIAL_TTY_MINORS		256
+
+#define MAX_RX_URBS			2
+
+#define get_serial_by_tty(x)	\
+	(x ? (struct hso_serial *)x->driver_data : NULL)
+
+/*****************************************************************************/
+/* Debugging functions                                                       */
+/*****************************************************************************/
+#define D__(lvl_, fmt, arg...)				\
+	do {						\
+		printk(lvl_ "[%d:%s]: " fmt "\n",	\
+		       __LINE__, __func__, ## arg);	\
+	} while (0)
+
+#define D_(lvl, args...)				\
+	do {						\
+		if (lvl & debug)			\
+			D__(KERN_INFO, args);		\
+	} while (0)
+
+#define D1(args...)	D_(0x01, ##args)
+#define D2(args...)	D_(0x02, ##args)
+#define D3(args...)	D_(0x04, ##args)
+#define D4(args...)	D_(0x08, ##args)
+#define D5(args...)	D_(0x10, ##args)
+
+/*****************************************************************************/
+/* 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;
+
+	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;
+};
+
+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;
+
+	unsigned long flags;
+	u8 rts_state;
+	u8 dtr_state;
+	unsigned tx_urb_used:1;
+
+	/* from usb_serial_port */
+	struct tty_struct *tty;
+	int open_count;
+	spinlock_t serial_lock;
+
+	int (*write_data) (struct hso_serial *serial);
+};
+
+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, struct file *file,
+			       unsigned int set, unsigned int clear);
+static void ctrl_callback(struct urb *urb);
+static void 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 log_usb_status(int status, const char *function);
+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 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);
+
+/*****************************************************************************/
+/* Helping functions                                                         */
+/*****************************************************************************/
+
+/* #define DEBUG */
+
+#define dev2net(x) (x->port_data.dev_net)
+#define dev2ser(x) (x->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)
+{
+	u8 i = 0;
+
+	printk(KERN_DEBUG "[%d:%s]: len %d", line_count, func_name, len);
+
+	for (i = 0; i < len; i++) {
+		if (!(i % 16))
+			printk("\n    0x%03x:  ", i);
+		printk("%02x ", (unsigned char)buf[i]);
+	}
+	printk("\n");
+}
+
+#define DUMP(buf_, len_)	\
+	dbg_dump(__LINE__, __func__, 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__ ": " DRIVER_VERSION " " 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 spinlock_t serial_table_lock;
+static struct ktermios *hso_serial_termios[HSO_SERIAL_TTY_MINORS];
+static struct ktermios *hso_serial_termios_locked[HSO_SERIAL_TTY_MINORS];
+
+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 */
+	{default_port_device(0x0af0, 0xd033)},	/* Icon-322 */
+	{USB_DEVICE(0x0af0, 0x7301)},		/* GE40x */
+	{USB_DEVICE(0x0af0, 0x7361)},		/* GE40x */
+	{USB_DEVICE(0x0af0, 0x7401)},		/* GI 0401 */
+	{USB_DEVICE(0x0af0, 0x7501)},		/* GTM 382 */
+	{USB_DEVICE(0x0af0, 0x7601)},		/* GE40x */
+	{}
+};
+MODULE_DEVICE_TABLE(usb, hso_ids);
+
+/* Sysfs attribute */
+static ssize_t hso_sysfs_show_porttype(struct device *dev,
+				       struct device_attribute *attr,
+				       char *buf)
+{
+	struct hso_device *hso_dev = dev->driver_data;
+	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(hsotype, S_IRUGO, hso_sysfs_show_porttype, NULL);
+
+/* 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;
+	unsigned long flags;
+
+	if (!serial_table[index])
+		return NULL;
+	spin_lock_irqsave(&serial_table_lock, flags);
+	serial = dev2ser(serial_table[index]);
+	spin_unlock_irqrestore(&serial_table_lock, flags);
+
+	return serial;
+}
+
+static int get_free_serial_index(void)
+{
+	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) {
+			spin_unlock_irqrestore(&serial_table_lock, flags);
+			return index;
+		}
+	}
+	spin_unlock_irqrestore(&serial_table_lock, flags);
+
+	printk(KERN_ERR "%s: no free serial devices in table\n", __func__);
+	return -1;
+}
+
+static void set_serial_by_index(unsigned index, struct hso_serial *serial)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&serial_table_lock, flags);
+	if (serial)
+		serial_table[index] = serial->parent;
+	else
+		serial_table[index] = NULL;
+	spin_unlock_irqrestore(&serial_table_lock, flags);
+}
+
+/* log a meaningfull explanation of an USB status */
+static void log_usb_status(int status, const char *function)
+{
+	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;
+	default:
+		explanation = "unknown status";
+		break;
+	}
+	D1("%s: received USB status - %s (%d)", 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);
+
+	hso_start_net_device(odev->parent);
+
+	/* We are up and running. */
+	set_bit(HSO_NET_RUNNING, &odev->flags);
+
+	/* 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)
+		log_usb_status(status, __func__);
+
+	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 int 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 0;
+	}
+
+	/* 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);
+	D1("len: %d/%d", 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", result);
+		net->stats.tx_errors++;
+		netif_start_queue(net);
+	} else {
+		net->stats.tx_packets++;
+		net->stats.tx_bytes += skb->len;
+		/* And tell the kernel when the last transmit started. */
+		net->trans_start = jiffies;
+	}
+	dev_kfree_skb(skb);
+	/* we're done */
+	return result;
+}
+
+static void hso_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
+{
+	struct hso_net *odev = netdev_priv(net);
+
+	strncpy(info->driver, driver_name, ETHTOOL_BUSINFO_LEN);
+	strncpy(info->version, DRIVER_VERSION, ETHTOOL_BUSINFO_LEN);
+	usb_make_path(odev->parent->usb, info->bus_info, sizeof info->bus_info);
+}
+
+static struct ethtool_ops ops = {
+	.get_drvinfo = hso_get_drvinfo,
+	.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)
+{
+	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
+	    && (odev->mux_bulk_tx_urb->status == -EINPROGRESS))
+		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;
+	unsigned char *tmp_rx_buf;
+
+	/* log if needed */
+	D1("Rx %d bytes", 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 = dev_alloc_skb(frame_len);
+				if (!odev->skb_rx_buf) {
+					/* We got no receive buffer. */
+					D1("could not allocate memory");
+					odev->rx_parse_state = WAIT_SYNC;
+					return;
+				}
+				/* Here's where it came from */
+				odev->skb_rx_buf->dev = odev->net;
+
+				/* Copy what we got so far. make room for iphdr
+				 * after tail. */
+				tmp_rx_buf =
+				    skb_put(odev->skb_rx_buf,
+					    sizeof(struct iphdr));
+				memcpy(tmp_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. */
+			tmp_rx_buf = skb_put(odev->skb_rx_buf, temp_bytes);
+			memcpy(tmp_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 =
+						__constant_htons(ETH_P_IP);
+				/* don't check it */
+				odev->skb_rx_buf->ip_summed =
+					CHECKSUM_UNNECESSARY;
+
+				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:
+			D1(" W_S");
+			count = 0;
+			break;
+		default:
+			D1(" ");
+			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);
+		}
+	}
+}
+
+/* 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;
+	int status = urb->status;
+
+	/* is al ok?  (Filip: Who's Al ?) */
+	if (status) {
+		log_usb_status(status, __func__);
+		return;
+	}
+
+	/* Sanity check */
+	if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
+		D1("BULK IN callback but driver is not active!");
+		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) {
+		u32 rest;
+		u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
+		rest = urb->actual_length % odev->in_endp->wMaxPacketSize;
+		if (((rest == 5) || (rest == 6))
+		    && !memcmp(((u8 *) urb->transfer_buffer) +
+			       urb->actual_length - 4, crc_check, 4)) {
+			urb->actual_length -= 4;
+		}
+	}
+
+	/* 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(&odev->net_lock);
+		packetizeRx(odev, urb->transfer_buffer, urb->actual_length,
+			    (urb->transfer_buffer_length >
+			     urb->actual_length) ? 1 : 0);
+		spin_unlock(&odev->net_lock);
+	}
+
+	/* 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", __func__,
+			 result);
+}
+
+/* Serial driver functions */
+
+static void _hso_serial_set_termios(struct tty_struct *tty,
+				    struct ktermios *old)
+{
+	struct hso_serial *serial = get_serial_by_tty(tty);
+	struct ktermios *termios;
+
+	if ((!tty) || (!tty->termios) || (!serial)) {
+		printk(KERN_ERR "%s: no tty structures", __func__);
+		return;
+	}
+
+	D4("port %d", serial->minor);
+
+	/*
+	 * The default requirements for this device are:
+	 */
+	termios = tty->termios;
+	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_encode_baud_rate(serial->tty, 115200, 115200);
+
+	/*
+	 * Force low_latency on; otherwise the pushes are scheduled;
+	 * this is bad as it opens up the possibility of dropping bytes
+	 * on the floor.  We don't want to drop bytes on the floor. :)
+	 */
+	serial->tty->low_latency = 1;
+	return;
+}
+
+/* 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) {
+		tty->driver_data = NULL;
+		D1("Failed to open port");
+		return -ENODEV;
+	}
+
+	mutex_lock(&serial->parent->mutex);
+	result = usb_autopm_get_interface(serial->parent->interface);
+	if (result < 0)
+		goto err_out;
+
+	D1("Opening %d", serial->minor);
+