drivers/serial : move serial drivers to drivers/serial

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

1 files changed, 1012 insertions, 0 deletions

diff --git a/drivers/serial/usbtty.c b/drivers/serial/usbtty.c
new file mode 100644
index 0000000..a3b5013
--- /dev/null
+++ b/drivers/serial/usbtty.c
@@ -0,0 +1,1012 @@
+/*
+ * (C) Copyright 2003
+ * Gerry Hamel, geh@ti.com, Texas Instruments
+ *
+ * (C) Copyright 2006
+ * Bryan O'Donoghue, bodonoghue@codehermit.ie
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307	 USA
+ *
+ */
+
+#include <common.h>
+
+#ifdef CONFIG_USB_TTY
+
+#include <circbuf.h>
+#include <devices.h>
+#include "usbtty.h"
+#include "usb_cdc_acm.h"
+#include "usbdescriptors.h"
+#include <config.h>		/* If defined, override Linux identifiers with
+			   	 * vendor specific ones */
+
+#if 0
+#define TTYDBG(fmt,args...)\
+	serial_printf("[%s] %s %d: "fmt, __FILE__,__FUNCTION__,__LINE__,##args)
+#else
+#define TTYDBG(fmt,args...) do{}while(0)
+#endif
+
+#if 1
+#define TTYERR(fmt,args...)\
+	serial_printf("ERROR![%s] %s %d: "fmt, __FILE__,__FUNCTION__,\
+	__LINE__,##args)
+#else
+#define TTYERR(fmt,args...) do{}while(0)
+#endif
+
+/*
+ * Defines
+ */
+#define NUM_CONFIGS    1
+#define MAX_INTERFACES 2
+#define NUM_ENDPOINTS  3
+#define ACM_TX_ENDPOINT 3
+#define ACM_RX_ENDPOINT 2
+#define GSERIAL_TX_ENDPOINT 2
+#define GSERIAL_RX_ENDPOINT 1
+#define NUM_ACM_INTERFACES 2
+#define NUM_GSERIAL_INTERFACES 1
+#define CONFIG_USBD_DATA_INTERFACE_STR "Bulk Data Interface"
+#define CONFIG_USBD_CTRL_INTERFACE_STR "Control Interface"
+
+/*
+ * Buffers to hold input and output data
+ */
+#define USBTTY_BUFFER_SIZE 256
+static circbuf_t usbtty_input;
+static circbuf_t usbtty_output;
+
+
+/*
+ * Instance variables
+ */
+static device_t usbttydev;
+static struct usb_device_instance device_instance[1];
+static struct usb_bus_instance bus_instance[1];
+static struct usb_configuration_instance config_instance[NUM_CONFIGS];
+static struct usb_interface_instance interface_instance[MAX_INTERFACES];
+static struct usb_alternate_instance alternate_instance[MAX_INTERFACES];
+/* one extra for control endpoint */
+static struct usb_endpoint_instance endpoint_instance[NUM_ENDPOINTS+1];
+
+/*
+ * Global flag
+ */
+int usbtty_configured_flag = 0;
+
+/*
+ * Serial number
+ */
+static char serial_number[16];
+
+
+/*
+ * Descriptors, Strings, Local variables.
+ */
+
+/* defined and used by usbdcore_ep0.c */
+extern struct usb_string_descriptor **usb_strings;
+
+/* Indicies, References */
+static unsigned short rx_endpoint = 0;
+static unsigned short tx_endpoint = 0;
+static unsigned short interface_count = 0;
+static struct usb_string_descriptor *usbtty_string_table[STR_COUNT];
+
+/* USB Descriptor Strings */
+static u8 wstrLang[4] = {4,USB_DT_STRING,0x9,0x4};
+static u8 wstrManufacturer[2 + 2*(sizeof(CONFIG_USBD_MANUFACTURER)-1)];
+static u8 wstrProduct[2 + 2*(sizeof(CONFIG_USBD_PRODUCT_NAME)-1)];
+static u8 wstrSerial[2 + 2*(sizeof(serial_number) - 1)];
+static u8 wstrConfiguration[2 + 2*(sizeof(CONFIG_USBD_CONFIGURATION_STR)-1)];
+static u8 wstrDataInterface[2 + 2*(sizeof(CONFIG_USBD_DATA_INTERFACE_STR)-1)];
+static u8 wstrCtrlInterface[2 + 2*(sizeof(CONFIG_USBD_DATA_INTERFACE_STR)-1)];
+
+/* Standard USB Data Structures */
+static struct usb_interface_descriptor interface_descriptors[MAX_INTERFACES];
+static struct usb_endpoint_descriptor *ep_descriptor_ptrs[NUM_ENDPOINTS];
+static struct usb_configuration_descriptor	*configuration_descriptor = 0;
+static struct usb_device_descriptor device_descriptor = {
+	.bLength = sizeof(struct usb_device_descriptor),
+	.bDescriptorType =	USB_DT_DEVICE,
+	.bcdUSB = 		cpu_to_le16(USB_BCD_VERSION),
+	.bDeviceSubClass =	0x00,
+	.bDeviceProtocol =	0x00,
+	.bMaxPacketSize0 =	EP0_MAX_PACKET_SIZE,
+	.idVendor =		cpu_to_le16(CONFIG_USBD_VENDORID),
+	.bcdDevice =		cpu_to_le16(USBTTY_BCD_DEVICE),
+	.iManufacturer =	STR_MANUFACTURER,
+	.iProduct =		STR_PRODUCT,
+	.iSerialNumber =	STR_SERIAL,
+	.bNumConfigurations =	NUM_CONFIGS
+};
+
+
+/*
+ * Static CDC ACM specific descriptors
+ */
+
+struct acm_config_desc {
+	struct usb_configuration_descriptor configuration_desc;
+
+	/* Master Interface */
+	struct usb_interface_descriptor interface_desc;
+
+	struct usb_class_header_function_descriptor usb_class_header;
+	struct usb_class_call_management_descriptor usb_class_call_mgt;
+	struct usb_class_abstract_control_descriptor usb_class_acm;
+	struct usb_class_union_function_descriptor usb_class_union;
+	struct usb_endpoint_descriptor notification_endpoint;
+
+	/* Slave Interface */
+	struct usb_interface_descriptor data_class_interface;
+	struct usb_endpoint_descriptor
+		data_endpoints[NUM_ENDPOINTS-1] __attribute__((packed));
+} __attribute__((packed));
+
+static struct acm_config_desc acm_configuration_descriptors[NUM_CONFIGS] = {
+	{
+		.configuration_desc ={
+			.bLength =
+				sizeof(struct usb_configuration_descriptor),
+    			.bDescriptorType = USB_DT_CONFIG,
+			.wTotalLength =
+				cpu_to_le16(sizeof(struct acm_config_desc)),
+	    		.bNumInterfaces = NUM_ACM_INTERFACES,
+    			.bConfigurationValue = 1,
+			.iConfiguration = STR_CONFIG,
+			.bmAttributes =
+				BMATTRIBUTE_SELF_POWERED|BMATTRIBUTE_RESERVED,
+			.bMaxPower = USBTTY_MAXPOWER
+		},
+		/* Interface 1 */
+		.interface_desc = {
+			.bLength  = sizeof(struct usb_interface_descriptor),
+			.bDescriptorType = USB_DT_INTERFACE,
+			.bInterfaceNumber = 0,
+			.bAlternateSetting = 0,
+			.bNumEndpoints = 0x01,
+			.bInterfaceClass =
+				COMMUNICATIONS_INTERFACE_CLASS_CONTROL,
+			.bInterfaceSubClass = COMMUNICATIONS_ACM_SUBCLASS,
+			.bInterfaceProtocol = COMMUNICATIONS_V25TER_PROTOCOL,
+			.iInterface = STR_CTRL_INTERFACE,
+		},
+		.usb_class_header = {
+			.bFunctionLength	=
+				sizeof(struct usb_class_header_function_descriptor),
+			.bDescriptorType	= CS_INTERFACE,
+			.bDescriptorSubtype	= USB_ST_HEADER,
+			.bcdCDC	= cpu_to_le16(110),
+		},
+		.usb_class_call_mgt = {
+			.bFunctionLength	=
+				sizeof(struct usb_class_call_management_descriptor),
+			.bDescriptorType	= CS_INTERFACE,
+			.bDescriptorSubtype	= USB_ST_CMF,
+			.bmCapabilities		= 0x00,
+			.bDataInterface		= 0x01,
+		},
+		.usb_class_acm = {
+			.bFunctionLength	=
+				sizeof(struct usb_class_abstract_control_descriptor),
+			.bDescriptorType	= CS_INTERFACE,
+			.bDescriptorSubtype	= USB_ST_ACMF,
+			.bmCapabilities		= 0x00,
+		},
+		.usb_class_union = {
+			.bFunctionLength	=
+				sizeof(struct usb_class_union_function_descriptor),
+			.bDescriptorType	= CS_INTERFACE,
+			.bDescriptorSubtype	= USB_ST_UF,
+			.bMasterInterface	= 0x00,
+			.bSlaveInterface0	= 0x01,
+		},
+		.notification_endpoint = {
+			.bLength =
+				sizeof(struct usb_endpoint_descriptor),
+			.bDescriptorType	= USB_DT_ENDPOINT,
+			.bEndpointAddress	= 0x01 | USB_DIR_IN,
+			.bmAttributes		= USB_ENDPOINT_XFER_INT,
+			.wMaxPacketSize
+				= cpu_to_le16(CONFIG_USBD_SERIAL_INT_PKTSIZE),
+			.bInterval		= 0xFF,
+		},
+
+		/* Interface 2 */
+		.data_class_interface = {
+			.bLength		=
+				sizeof(struct usb_interface_descriptor),
+			.bDescriptorType	= USB_DT_INTERFACE,
+			.bInterfaceNumber	= 0x01,
+			.bAlternateSetting	= 0x00,
+			.bNumEndpoints		= 0x02,
+			.bInterfaceClass	=
+				COMMUNICATIONS_INTERFACE_CLASS_DATA,
+			.bInterfaceSubClass	= DATA_INTERFACE_SUBCLASS_NONE,
+			.bInterfaceProtocol	= DATA_INTERFACE_PROTOCOL_NONE,
+			.iInterface		= STR_DATA_INTERFACE,
+		},
+		.data_endpoints = {
+			{
+				.bLength		=
+					sizeof(struct usb_endpoint_descriptor),
+				.bDescriptorType	= USB_DT_ENDPOINT,
+				.bEndpointAddress	= 0x02 | USB_DIR_OUT,
+				.bmAttributes		=
+					USB_ENDPOINT_XFER_BULK,
+				.wMaxPacketSize		=
+					cpu_to_le16(CONFIG_USBD_SERIAL_BULK_PKTSIZE),
+				.bInterval		= 0xFF,
+			},
+			{
+				.bLength		=
+					sizeof(struct usb_endpoint_descriptor),
+				.bDescriptorType	= USB_DT_ENDPOINT,
+				.bEndpointAddress	= 0x03 | USB_DIR_IN,
+				.bmAttributes		=
+					USB_ENDPOINT_XFER_BULK,
+				.wMaxPacketSize		=
+					cpu_to_le16(CONFIG_USBD_SERIAL_BULK_PKTSIZE),
+				.bInterval		= 0xFF,
+			},
+		},
+	},
+};
+
+static struct rs232_emu rs232_desc={
+		.dter 		=  	115200,
+	   	.stop_bits	=	0x00,
+	   	.parity		=	0x00,
+		.data_bits	=	0x08
+};
+
+
+/*
+ * Static Generic Serial specific data
+ */
+
+
+struct gserial_config_desc {
+
+	struct usb_configuration_descriptor configuration_desc;
+	struct usb_interface_descriptor
+		interface_desc[NUM_GSERIAL_INTERFACES] __attribute__((packed));
+	struct usb_endpoint_descriptor
+		data_endpoints[NUM_ENDPOINTS] __attribute__((packed));
+
+} __attribute__((packed));
+
+static struct gserial_config_desc
+gserial_configuration_descriptors[NUM_CONFIGS] ={
+	{
+		.configuration_desc ={
+			.bLength = sizeof(struct usb_configuration_descriptor),
+			.bDescriptorType = USB_DT_CONFIG,
+			.wTotalLength =
+				cpu_to_le16(sizeof(struct gserial_config_desc)),
+			.bNumInterfaces = NUM_GSERIAL_INTERFACES,
+			.bConfigurationValue = 1,
+			.iConfiguration = STR_CONFIG,
+			.bmAttributes =
+				BMATTRIBUTE_SELF_POWERED|BMATTRIBUTE_RESERVED,
+			.bMaxPower = USBTTY_MAXPOWER
+		},
+		.interface_desc = {
+			{
+				.bLength  =
+					sizeof(struct usb_interface_descriptor),
+				.bDescriptorType = USB_DT_INTERFACE,
+				.bInterfaceNumber = 0,
+				.bAlternateSetting = 0,
+				.bNumEndpoints = NUM_ENDPOINTS,
+				.bInterfaceClass =
+					COMMUNICATIONS_INTERFACE_CLASS_VENDOR,
+				.bInterfaceSubClass =
+					COMMUNICATIONS_NO_SUBCLASS,
+				.bInterfaceProtocol =
+					COMMUNICATIONS_NO_PROTOCOL,
+				.iInterface = STR_DATA_INTERFACE
+			},
+  		},
+		.data_endpoints  = {
+			{
+				.bLength =
+					sizeof(struct usb_endpoint_descriptor),
+				.bDescriptorType =	USB_DT_ENDPOINT,
+				.bEndpointAddress =	0x01 | USB_DIR_OUT,
+				.bmAttributes =		USB_ENDPOINT_XFER_BULK,
+				.wMaxPacketSize =
+					cpu_to_le16(CONFIG_USBD_SERIAL_OUT_PKTSIZE),
+				.bInterval=		0xFF,
+			},
+			{
+				.bLength =
+					sizeof(struct usb_endpoint_descriptor),
+				.bDescriptorType =	USB_DT_ENDPOINT,
+				.bEndpointAddress =	0x02 | USB_DIR_IN,
+				.bmAttributes =		USB_ENDPOINT_XFER_BULK,
+				.wMaxPacketSize =
+					cpu_to_le16(CONFIG_USBD_SERIAL_IN_PKTSIZE),
+				.bInterval = 		0xFF,
+			},
+			{
+				.bLength =
+					sizeof(struct usb_endpoint_descriptor),
+				.bDescriptorType =	USB_DT_ENDPOINT,
+				.bEndpointAddress =	0x03 | USB_DIR_IN,
+				.bmAttributes =		USB_ENDPOINT_XFER_INT,
+    				.wMaxPacketSize =
+					cpu_to_le16(CONFIG_USBD_SERIAL_INT_PKTSIZE),
+				.bInterval =		0xFF,
+			},
+		},
+	},
+};
+
+/*
+ * Static Function Prototypes
+ */
+
+static void usbtty_init_strings (void);
+static void usbtty_init_instances (void);
+static void usbtty_init_endpoints (void);
+static void usbtty_init_terminal_type(short type);
+static void usbtty_event_handler (struct usb_device_instance *device,
+				usb_device_event_t event, int data);
+static int usbtty_cdc_setup(struct usb_device_request *request,
+				struct urb *urb);
+static int usbtty_configured (void);
+static int write_buffer (circbuf_t * buf);
+static int fill_buffer (circbuf_t * buf);
+
+void usbtty_poll (void);
+
+/* utility function for converting char* to wide string used by USB */
+static void str2wide (char *str, u16 * wide)
+{
+	int i;
+	for (i = 0; i < strlen (str) && str[i]; i++){
+		#if defined(__LITTLE_ENDIAN)
+			wide[i] = (u16) str[i];
+		#elif defined(__BIG_ENDIAN)
+			wide[i] = ((u16)(str[i])<<8);
+		#else
+			#error "__LITTLE_ENDIAN or __BIG_ENDIAN undefined"
+		#endif
+	}
+}
+
+/*
+ * Test whether a character is in the RX buffer
+ */
+
+int usbtty_tstc (void)
+{
+	struct usb_endpoint_instance *endpoint =
+		&endpoint_instance[rx_endpoint];
+
+	/* If no input data exists, allow more RX to be accepted */
+	if(usbtty_input.size <= 0){
+		udc_unset_nak(endpoint->endpoint_address&0x03);
+	}
+
+	usbtty_poll ();
+	return (usbtty_input.size > 0);
+}
+
+/*
+ * Read a single byte from the usb client port. Returns 1 on success, 0
+ * otherwise. When the function is succesfull, the character read is
+ * written into its argument c.
+ */
+
+int usbtty_getc (void)
+{
+	char c;
+	struct usb_endpoint_instance *endpoint =
+		&endpoint_instance[rx_endpoint];
+
+	while (usbtty_input.size <= 0) {
+		udc_unset_nak(endpoint->endpoint_address&0x03);
+		usbtty_poll ();
+	}
+
+	buf_pop (&usbtty_input, &c, 1);
+	udc_set_nak(endpoint->endpoint_address&0x03);
+
+	return c;
+}
+
+/*
+ * Output a single byte to the usb client port.
+ */
+void usbtty_putc (const char c)
+{
+	buf_push (&usbtty_output, &c, 1);
+	/* If \n, also do \r */
+	if (c == '\n')
+		buf_push (&usbtty_output, "\r", 1);
+
+	/* Poll at end to handle new data... */
+	if ((usbtty_output.size + 2) >= usbtty_output.totalsize) {
+		usbtty_poll ();
+	}
+}
+
+/* usbtty_puts() helper function for finding the next '\n' in a string */
+static int next_nl_pos (const char *s)
+{
+	int i;
+
+	for (i = 0; s[i] != '\0'; i++) {
+		if (s[i] == '\n')
+			return i;
+	}
+	return i;
+}
+
+/*
+ * Output a string to the usb client port - implementing flow control
+ */
+
+static void __usbtty_puts (const char *str, int len)
+{
+	int maxlen = usbtty_output.totalsize;
+	int space, n;
+
+	/* break str into chunks < buffer size, if needed */
+	while (len > 0) {
+		usbtty_poll ();
+
+		space = maxlen - usbtty_output.size;
+		/* Empty buffer here, if needed, to ensure space... */
+		if (space) {
+			write_buffer (&usbtty_output);
+
+			n = MIN (space, MIN (len, maxlen));
+			buf_push (&usbtty_output, str, n);
+
+			str += n;
+			len -= n;
+		}
+	}
+}
+
+void usbtty_puts (const char *str)
+{
+	int n;
+	int len = strlen (str);
+
+	/* add '\r' for each '\n' */
+	while (len > 0) {
+		n = next_nl_pos (str);
+
+		if (str[n] == '\n') {
+			__usbtty_puts (str, n + 1);
+			__usbtty_puts ("\r", 1);
+			str += (n + 1);
+			len -= (n + 1);
+		} else {
+			/* No \n found.	 All done. */
+			__usbtty_puts (str, n);
+			break;
+		}
+	}
+
+	/* Poll at end to handle new data... */
+	usbtty_poll ();
+}
+
+/*
+ * Initialize the usb client port.
+ *
+ */
+int drv_usbtty_init (void)
+{
+	int rc;
+	char * sn;
+	char * tt;
+	int snlen;
+
+	/* Ger seiral number */
+	if (!(sn = getenv("serial#"))) {
+		sn = "000000000000";
+	}
+	snlen = strlen(sn);
+	if (snlen > sizeof(serial_number) - 1) {
+		printf ("Warning: serial number %s is too long (%d > %d)\n",
+			sn, snlen, sizeof(serial_number) - 1);
+		snlen = sizeof(serial_number) - 1;
+	}
+	memcpy (serial_number, sn, snlen);
+	serial_number[snlen] = '\0';
+
+	/* Decide on which type of UDC device to be.
+	 */
+
+	if(!(tt = getenv("usbtty"))) {
+		tt = "generic";
+	}
+	usbtty_init_terminal_type(strcmp(tt,"cdc_acm"));
+
+	/* prepare buffers... */
+	buf_init (&usbtty_input, USBTTY_BUFFER_SIZE);
+	buf_init (&usbtty_output, USBTTY_BUFFER_SIZE);
+
+	/* Now, set up USB controller and infrastructure */
+	udc_init ();		/* Basic USB initialization */
+
+	usbtty_init_strings ();
+	usbtty_init_instances ();
+
+	udc_startup_events (device_instance);/* Enable dev, init udc pointers */
+	udc_connect ();		/* Enable pullup for host detection */
+
+	usbtty_init_endpoints ();
+
+	/* Device initialization */
+	memset (&usbttydev, 0, sizeof (usbttydev));
+
+	strcpy (usbttydev.name, "usbtty");
+	usbttydev.ext = 0;	/* No extensions */
+	usbttydev.flags = DEV_FLAGS_INPUT | DEV_FLAGS_OUTPUT;
+	usbttydev.tstc = usbtty_tstc;	/* 'tstc' function */
+	usbttydev.getc = usbtty_getc;	/* 'getc' function */
+	usbttydev.putc = usbtty_putc;	/* 'putc' function */
+	usbttydev.puts = usbtty_puts;	/* 'puts' function */
+
+	rc = device_register (&usbttydev);
+
+	return (rc == 0) ? 1 : rc;
+}
+
+static void usbtty_init_strings (void)
+{
+	struct usb_string_descriptor *string;
+
+	usbtty_string_table[STR_LANG] =
+		(struct usb_string_descriptor*)wstrLang;
+
+	string = (struct usb_string_descriptor *) wstrManufacturer;
+	string->bLength = sizeof(wstrManufacturer);
+	string->bDescriptorType = USB_DT_STRING;
+	str2wide (CONFIG_USBD_MANUFACTURER, string->wData);
+	usbtty_string_table[STR_MANUFACTURER]=string;
+
+
+	string = (struct usb_string_descriptor *) wstrProduct;
+	string->bLength = sizeof(wstrProduct);
+	string->bDescriptorType = USB_DT_STRING;
+	str2wide (CONFIG_USBD_PRODUCT_NAME, string->wData);
+	usbtty_string_table[STR_PRODUCT]=string;
+
+
+	string = (struct usb_string_descriptor *) wstrSerial;
+	string->bLength = sizeof(serial_number);
+	string->bDescriptorType = USB_DT_STRING;
+	str2wide (serial_number, string->wData);
+	usbtty_string_table[STR_SERIAL]=string;
+
+
+	string = (struct usb_string_descriptor *) wstrConfiguration;
+	string->bLength = sizeof(wstrConfiguration);
+	string->bDescriptorType = USB_DT_STRING;
+	str2wide (CONFIG_USBD_CONFIGURATION_STR, string->wData);
+	usbtty_string_table[STR_CONFIG]=string;
+
+
+	string = (struct usb_string_descriptor *) wstrDataInterface;
+	string->bLength = sizeof(wstrDataInterface);
+	string->bDescriptorType = USB_DT_STRING;
+	str2wide (CONFIG_USBD_DATA_INTERFACE_STR, string->wData);
+	usbtty_string_table[STR_DATA_INTERFACE]=string;
+
+	string = (struct usb_string_descriptor *) wstrCtrlInterface;
+	string->bLength = sizeof(wstrCtrlInterface);
+	string->bDescriptorType = USB_DT_STRING;
+	str2wide (CONFIG_USBD_CTRL_INTERFACE_STR, string->wData);
+	usbtty_string_table[STR_CTRL_INTERFACE]=string;
+
+	/* Now, initialize the string table for ep0 handling */
+	usb_strings = usbtty_string_table;
+}
+
+static void usbtty_init_instances (void)
+{
+	int i;
+
+	/* initialize device instance */
+	memset (device_instance, 0, sizeof (struct usb_device_instance));
+	device_instance->device_state = STATE_INIT;
+	device_instance->device_descriptor = &device_descriptor;
+	device_instance->event = usbtty_event_handler;
+	device_instance->cdc_recv_setup = usbtty_cdc_setup;
+	device_instance->bus = bus_instance;
+	device_instance->configurations = NUM_CONFIGS;
+	device_instance->configuration_instance_array = config_instance;
+
+	/* initialize bus instance */
+	memset (bus_instance, 0, sizeof (struct usb_bus_instance));
+	bus_instance->device = device_instance;
+	bus_instance->endpoint_array = endpoint_instance;
+	bus_instance->max_endpoints = 1;
+	bus_instance->maxpacketsize = 64;
+	bus_instance->serial_number_str = serial_number;
+
+	/* configuration instance */
+	memset (config_instance, 0,
+		sizeof (struct usb_configuration_instance));
+	config_instance->interfaces = interface_count;
+	config_instance->configuration_descriptor = configuration_descriptor;
+	config_instance->interface_instance_array = interface_instance;
+
+	/* interface instance */
+	memset (interface_instance, 0,
+		sizeof (struct usb_interface_instance));
+	interface_instance->alternates = 1;
+	interface_instance->alternates_instance_array = alternate_instance;
+
+	/* alternates instance */
+	memset (alternate_instance, 0,
+		sizeof (struct usb_alternate_instance));
+	alternate_instance->interface_descriptor = interface_descriptors;
+	alternate_instance->endpoints = NUM_ENDPOINTS;
+	alternate_instance->endpoints_descriptor_array = ep_descriptor_ptrs;
+
+	/* endpoint instances */
+	memset (&endpoint_instance[0], 0,
+		sizeof (struct usb_endpoint_instance));
+	endpoint_instance[0].endpoint_address = 0;
+	endpoint_instance[0].rcv_packetSize = EP0_MAX_PACKET_SIZE;
+	endpoint_instance[0].rcv_attributes = USB_ENDPOINT_XFER_CONTROL;
+	endpoint_instance[0].tx_packetSize = EP0_MAX_PACKET_SIZE;
+	endpoint_instance[0].tx_attributes = USB_ENDPOINT_XFER_CONTROL;
+	udc_setup_ep (device_instance, 0, &endpoint_instance[0]);
+
+	for (i = 1; i <= NUM_ENDPOINTS; i++) {
+		memset (&endpoint_instance[i], 0,
+			sizeof (struct usb_endpoint_instance));
+
+		endpoint_instance[i].endpoint_address =
+			ep_descriptor_ptrs[i - 1]->bEndpointAddress;
+
+		endpoint_instance[i].rcv_attributes =
+			ep_descriptor_ptrs[i - 1]->bmAttributes;
+
+		endpoint_instance[i].rcv_packetSize =
+			le16_to_cpu(ep_descriptor_ptrs[i - 1]->wMaxPacketSize);
+
+		endpoint_instance[i].tx_attributes =
+			ep_descriptor_ptrs[i - 1]->bmAttributes;
+
+		endpoint_instance[i].tx_packetSize =
+			le16_to_cpu(ep_descriptor_ptrs[i - 1]->wMaxPacketSize);
+
+		endpoint_instance[i].tx_attributes =
+			ep_descriptor_ptrs[i - 1]->bmAttributes;
+
+		urb_link_init (&endpoint_instance[i].rcv);
+		urb_link_init (&endpoint_instance[i].rdy);
+		urb_link_init (&endpoint_instance[i].tx);
+		urb_link_init (&endpoint_instance[i].done);
+
+		if (endpoint_instance[i].endpoint_address & USB_DIR_IN)
+			endpoint_instance[i].tx_urb =
+				usbd_alloc_urb (device_instance,
+						&endpoint_instance[i]);
+		else
+			endpoint_instance[i].rcv_urb =
+				usbd_alloc_urb (device_instance,
+						&endpoint_instance[i]);
+	}
+}
+
+static void usbtty_init_endpoints (void)
+{
+	int i;
+
+	bus_instance->max_endpoints = NUM_ENDPOINTS + 1;
+	for (i = 1; i <= NUM_ENDPOINTS; i++) {
+		udc_setup_ep (device_instance, i, &endpoint_instance[i]);
+	}
+}
+
+/* usbtty_init_terminal_type
+ *
+ * Do some late binding for our device type.
+ */
+static void usbtty_init_terminal_type(short type)
+{
+	switch(type){
+		/* CDC ACM */
+		case 0:
+			/* Assign endpoint descriptors */
+			ep_descriptor_ptrs[0] =
+				&acm_configuration_descriptors[0].notification_endpoint;
+			ep_descriptor_ptrs[1] =
+				&acm_configuration_descriptors[0].data_endpoints[0];
+			ep_descriptor_ptrs[2] =
+				&acm_configuration_descriptors[0].data_endpoints[1];
+
+			/* Enumerate Device Descriptor */
+			device_descriptor.bDeviceClass =
+				COMMUNICATIONS_DEVICE_CLASS;
+			device_descriptor.idProduct =
+				cpu_to_le16(CONFIG_USBD_PRODUCTID_CDCACM);
+
+			/* Assign endpoint indices */
+			tx_endpoint = ACM_TX_ENDPOINT;
+			rx_endpoint = ACM_RX_ENDPOINT;
+
+			/* Configuration Descriptor */
+			configuration_descriptor =
+				(struct usb_configuration_descriptor*)
+				&acm_configuration_descriptors;
+
+			/* Interface count */
+			interface_count = NUM_ACM_INTERFACES;
+		break;
+
+		/* BULK IN/OUT & Default */
+		case 1:
+		default:
+			/* Assign endpoint descriptors */
+			ep_descriptor_ptrs[0] =
+				&gserial_configuration_descriptors[0].data_endpoints[0];
+			ep_descriptor_ptrs[1] =
+				&gserial_configuration_descriptors[0].data_endpoints[1];
+			ep_descriptor_ptrs[2] =
+				&gserial_configuration_descriptors[0].data_endpoints[2];
+
+			/* Enumerate Device Descriptor */
+			device_descriptor.bDeviceClass = 0xFF;
+			device_descriptor.idProduct =
+				cpu_to_le16(CONFIG_USBD_PRODUCTID_GSERIAL);
+
+			/* Assign endpoint indices */
+			tx_endpoint = GSERIAL_TX_ENDPOINT;
+			rx_endpoint = GSERIAL_RX_ENDPOINT;
+
+			/* Configuration Descriptor */
+			configuration_descriptor =
+				(struct usb_configuration_descriptor*)
+				&gserial_configuration_descriptors;
+
+			/* Interface count */
+			interface_count = NUM_GSERIAL_INTERFACES;
+		break;
+	}
+}
+
+/******************************************************************************/
+
+static struct urb *next_urb (struct usb_device_instance *device,
+			     struct usb_endpoint_instance *endpoint)
+{
+	struct urb *current_urb = NULL;
+	int space;
+
+	/* If there's a queue, then we should add to the last urb */
+	if (!endpoint->tx_queue) {
+		current_urb = endpoint->tx_urb;
+	} else {
+		/* Last urb from tx chain */
+		current_urb =
+			p2surround (struct urb, link, endpoint->tx.prev);
+	}
+
+	/* Make sure this one has enough room */
+	space = current_urb->buffer_length - current_urb->actual_length;
+	if (space > 0) {
+		return current_urb;
+	} else {		/* No space here */
+		/* First look at done list */
+		current_urb = first_urb_detached (&endpoint->done);
+		if (!current_urb) {
+			current_urb = usbd_alloc_urb (device, endpoint);
+		}
+
+		urb_append (&endpoint->tx, current_urb);
+		endpoint->tx_queue++;
+	}
+	return current_urb;
+}
+
+static int write_buffer (circbuf_t * buf)
+{
+	if (!usbtty_configured ()) {
+		return 0;
+	}
+
+	struct usb_endpoint_instance *endpoint =
+			&endpoint_instance[tx_endpoint];
+	struct urb *current_urb = NULL;
+
+	current_urb = next_urb (device_instance, endpoint);
+	/* TX data still exists - send it now
+	 */
+	if(endpoint->sent < current_urb->actual_length){
+		if(udc_endpoint_write (endpoint)){
+			/* Write pre-empted by RX */
+			return -1;
+		}
+	}
+
+	if (buf->size) {
+		char *dest;
+
+		int space_avail;
+		int popnum, popped;
+		int total = 0;
+
+		/* Break buffer into urb sized pieces,
+		 * and link each to the endpoint
+		 */
+		while (buf->size > 0) {
+
+			if (!current_urb) {
+				TTYERR ("current_urb is NULL, buf->size %d\n",
+					buf->size);
+				return total;
+			}
+
+			dest = (char*)current_urb->buffer +
+				current_urb->actual_length;
+
+			space_avail =
+				current_urb->buffer_length -
+				current_urb->actual_length;
+			popnum = MIN (space_avail, buf->size);
+			if (popnum == 0)
+				break;
+
+			popped = buf_pop (buf, dest, popnum);
+			if (popped == 0)
+				break;
+			current_urb->actual_length += popped;
+			total += popped;
+
+			/* If endpoint->last == 0, then transfers have
+			 * not started on this endpoint
+			 */
+			if (endpoint->last == 0) {
+				if(udc_endpoint_write (endpoint)){
+					/* Write pre-empted by RX */
+					return -1;
+				}
+			}
+
+		}/* end while */
+		return total;
+	}
+
+	return 0;
+}
+
+static int fill_buffer (circbuf_t * buf)
+{
+	struct usb_endpoint_instance *endpoint =
+		&endpoint_instance[rx_endpoint];
+
+	if (endpoint->rcv_urb && endpoint->rcv_urb->actual_length) {
+		unsigned int nb = 0;
+		char *src = (char *) endpoint->rcv_urb->buffer;
+		unsigned int rx_avail = buf->totalsize - buf->size;
+
+		if(rx_avail >= endpoint->rcv_urb->actual_length){
+
+			nb = endpoint->rcv_urb->actual_length;
+			buf_push (buf, src, nb);
+			endpoint->rcv_urb->actual_length = 0;
+
+		}
+		return nb;
+	}
+	return 0;
+}
+
+static int usbtty_configured (void)
+{
+	return usbtty_configured_flag;
+}
+
+/******************************************************************************/
+
+static void usbtty_event_handler (struct usb_device_instance *device,
+				  usb_device_event_t event, int data)
+{
+	switch (event) {
+	case DEVICE_RESET:
+	case DEVICE_BUS_INACTIVE:
+		usbtty_configured_flag = 0;
+		break;
+	case DEVICE_CONFIGURED:
+		usbtty_configured_flag = 1;
+		break;
+
+	case DEVICE_ADDRESS_ASSIGNED:
+		usbtty_init_endpoints ();
+
+	default:
+		break;
+	}
+}
+
+/******************************************************************************/
+
+int usbtty_cdc_setup(struct usb_device_request *request, struct urb *urb)
+{
+	switch (request->bRequest){
+
+	   	case ACM_SET_CONTROL_LINE_STATE:	/* Implies DTE ready */
+			break;
+	   	case ACM_SEND_ENCAPSULATED_COMMAND :	/* Required */
+			break;
+		case ACM_SET_LINE_ENCODING :		/* DTE stop/parity bits
+							 * per character */
+			break;
+	   	case ACM_GET_ENCAPSULATED_RESPONSE :	/* request response */
+			break;
+		case ACM_GET_LINE_ENCODING :		/* request DTE rate,
+							 * stop/parity bits */
+			memcpy (urb->buffer , &rs232_desc, sizeof(rs232_desc));
+			urb->actual_length = sizeof(rs232_desc);
+
+			break;
+	 	default:
+			return 1;
+	}
+	return 0;
+}
+
+/******************************************************************************/
+
+/*
+ * Since interrupt handling has not yet been implemented, we use this function
+ * to handle polling.  This is called by the tstc,getc,putc,puts routines to
+ * update the USB state.
+ */
+void usbtty_poll (void)
+{
+	/* New interrupts? */
+	udc_irq();
+
+	/* Write any output data to host buffer
+	 * (do this before checking interrupts to avoid missing one)
+	 */
+	if (usbtty_configured ()) {
+		write_buffer (&usbtty_output);
+	}
+
+	/* New interrupts? */
+	udc_irq();
+
+	/* Check for new data from host..
+	 * (do this after checking interrupts to get latest data)
+	 */
+	if (usbtty_configured ()) {
+		fill_buffer (&usbtty_input);
+	}
+
+	/* New interrupts? */
+	udc_irq();
+
+}
+
+
+#endif