drivers/usb/gadget/android.c - kernel/msm - Gitiles

 /*
  * Gadget Driver for Android
  *
  * Copyright (C) 2008 Google, Inc.
  * Author: Mike Lockwood <lockwood@android.com>
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
  * may be copied, distributed, and modified under those terms.
  *
  * 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.
  *
  */

 /* #define DEBUG */
 /* #define VERBOSE_DEBUG */

 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/fs.h>

 #include <linux/delay.h>
 #include <linux/kernel.h>
 #include <linux/utsname.h>
 #include <linux/platform_device.h>

 #include <linux/usb/android_composite.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/composite.h>
 #include <linux/usb/gadget.h>

 #include "gadget_chips.h"

 /*
  * Kbuild is not very cooperative with respect to linking separately
  * compiled library objects into one module.  So for now we won't use
  * separate compilation ... ensuring init/exit sections work to shrink
  * the runtime footprint, and giving us at least some parts of what
  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  */
 #include "usbstring.c"
 #include "config.c"
 #include "epautoconf.c"
 #include "composite.c"

 MODULE_AUTHOR("Mike Lockwood");
 MODULE_DESCRIPTION("Android Composite USB Driver");
 MODULE_LICENSE("GPL");
 MODULE_VERSION("1.0");

 static const char longname[] = "Gadget Android";

 /* Default vendor and product IDs, overridden by platform data */
 #define VENDOR_ID		0x18D1
 #define PRODUCT_ID		0x0001

 struct android_dev {
 	struct usb_composite_dev *cdev;
 	struct usb_configuration *config;
 	int num_products;
 	struct android_usb_product *products;
 	int num_functions;
 	char **functions;

 	int vendor_id;
 	int product_id;
 	int version;
 };

 static struct android_dev *_android_dev;

 /* string IDs are assigned dynamically */

 #define STRING_MANUFACTURER_IDX		0
 #define STRING_PRODUCT_IDX		1
 #define STRING_SERIAL_IDX		2

 /* String Table */
 static struct usb_string strings_dev[] = {
 	/* These dummy values should be overridden by platform data */
 	[STRING_MANUFACTURER_IDX].s = "Android",
 	[STRING_PRODUCT_IDX].s = "Android",
 	[STRING_SERIAL_IDX].s = "0123456789ABCDEF",
 	{  }			/* end of list */
 };

 static struct usb_gadget_strings stringtab_dev = {
 	.language	= 0x0409,	/* en-us */
 	.strings	= strings_dev,
 };

 static struct usb_gadget_strings *dev_strings[] = {
 	&stringtab_dev,
 	NULL,
 };

 static struct usb_device_descriptor device_desc = {
 	.bLength              = sizeof(device_desc),
 	.bDescriptorType      = USB_DT_DEVICE,
 	.bcdUSB               = __constant_cpu_to_le16(0x0200),
 	.bDeviceClass         = USB_CLASS_PER_INTERFACE,
 	.idVendor             = __constant_cpu_to_le16(VENDOR_ID),
 	.idProduct            = __constant_cpu_to_le16(PRODUCT_ID),
 	.bcdDevice            = __constant_cpu_to_le16(0xffff),
 	.bNumConfigurations   = 1,
 };

 static struct list_head _functions = LIST_HEAD_INIT(_functions);
 static bool _are_functions_bound;

 static struct android_usb_function *get_function(const char *name)
 {
 	struct android_usb_function	*f;
 	list_for_each_entry(f, &_functions, list) {
 		if (!strcmp(name, f->name))
 			return f;
 	}
 	return 0;
 }

 static bool are_functions_registered(struct android_dev *dev)
 {
 	char **functions = dev->functions;
 	int i;

 	/* Look only for functions required by the board config */
 	for (i = 0; i < dev->num_functions; i++) {
 		char *name = *functions++;
 		bool is_match = false;
 		/* Could reuse get_function() here, but a reverse search
 		 * should yield less comparisons overall */
 		struct android_usb_function *f;
 		list_for_each_entry_reverse(f, &_functions, list) {
 			if (!strcmp(name, f->name)) {
 				is_match = true;
 				break;
 			}
 		}
 		if (is_match)
 			continue;
 		else
 			return false;
 	}

 	return true;
 }

 static bool should_bind_functions(struct android_dev *dev)
 {
 	/* Don't waste time if the main driver hasn't bound */
 	if (!dev->config)
 		return false;

 	/* Don't waste time if we've already bound the functions */
 	if (_are_functions_bound)
 		return false;

 	/* This call is the most costly, so call it last */
 	if (!are_functions_registered(dev))
 		return false;

 	return true;
 }

 static void bind_functions(struct android_dev *dev)
 {
 	struct android_usb_function	*f;
 	char **functions = dev->functions;
 	int i;

 	for (i = 0; i < dev->num_functions; i++) {
 		char *name = *functions++;
 		f = get_function(name);
 		if (f)
 			f->bind_config(dev->config);
 		else
 			printk(KERN_ERR "function %s not found in bind_functions\n", name);
 	}

 	_are_functions_bound = true;
 }

 static int android_bind_config(struct usb_configuration *c)
 {
 	struct android_dev *dev = _android_dev;

 	printk(KERN_DEBUG "android_bind_config\n");
 	dev->config = c;

 	if (should_bind_functions(dev))
 		bind_functions(dev);

 	return 0;
 }

 static int android_setup_config(struct usb_configuration *c,
 		const struct usb_ctrlrequest *ctrl);

 static struct usb_configuration android_config_driver = {
 	.label		= "android",
 	.setup		= android_setup_config,
 	.bConfigurationValue = 1,
 	.bmAttributes	= USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
 	.bMaxPower	= 0xFA, /* 500ma */
 };

 static int android_setup_config(struct usb_configuration *c,
 		const struct usb_ctrlrequest *ctrl)
 {
 	int i;
 	int ret = -EOPNOTSUPP;

 	for (i = 0; i < android_config_driver.next_interface_id; i++) {
 		if (android_config_driver.interface[i]->setup) {
 			ret = android_config_driver.interface[i]->setup(
 				android_config_driver.interface[i], ctrl);
 			if (ret >= 0)
 				return ret;
 		}
 	}
 	return ret;
 }

 static int product_has_function(struct android_usb_product *p,
 		struct usb_function *f)
 {
 	char **functions = p->functions;
 	int count = p->num_functions;
 	const char *name = f->name;
 	int i;

 	for (i = 0; i < count; i++) {
 		/* For functions with multiple instances, usb_function.name
 		 * will have an index appended to the core name (ex: acm0),
 		 * while android_usb_product.functions[i] will only have the
 		 * core name (ex: acm). So, only compare up to the length of
 		 * android_usb_product.functions[i].
 		 */
 		if (!strncmp(name, functions[i], strlen(functions[i])))
 			return 1;
 	}
 	return 0;
 }

 static int product_matches_functions(struct android_usb_product *p)
 {
 	struct usb_function		*f;
 	list_for_each_entry(f, &android_config_driver.functions, list) {
 		if (product_has_function(p, f) == !!f->disabled)
 			return 0;
 	}
 	return 1;
 }

 static int get_vendor_id(struct android_dev *dev)
 {
 	struct android_usb_product *p = dev->products;
 	int count = dev->num_products;
 	int i;

 	if (p) {
 		for (i = 0; i < count; i++, p++) {
 			if (p->vendor_id && product_matches_functions(p))
 				return p->vendor_id;
 		}
 	}
 	/* use default vendor ID */
 	return dev->vendor_id;
 }

 static int get_product_id(struct android_dev *dev)
 {
 	struct android_usb_product *p = dev->products;
 	int count = dev->num_products;
 	int i;

 	if (p) {
 		for (i = 0; i < count; i++, p++) {
 			if (product_matches_functions(p))
 				return p->product_id;
 		}
 	}
 	/* use default product ID */
 	return dev->product_id;
 }

 static int android_bind(struct usb_composite_dev *cdev)
 {
 	struct android_dev *dev = _android_dev;
 	struct usb_gadget	*gadget = cdev->gadget;
 	int			gcnum, id, ret;

 	printk(KERN_INFO "android_bind\n");

 	/* Allocate string descriptor numbers ... note that string
 	 * contents can be overridden by the composite_dev glue.
 	 */
 	id = usb_string_id(cdev);
 	if (id < 0)
 		return id;
 	strings_dev[STRING_MANUFACTURER_IDX].id = id;
 	device_desc.iManufacturer = id;

 	id = usb_string_id(cdev);
 	if (id < 0)
 		return id;
 	strings_dev[STRING_PRODUCT_IDX].id = id;
 	device_desc.iProduct = id;

 	id = usb_string_id(cdev);
 	if (id < 0)
 		return id;
 	strings_dev[STRING_SERIAL_IDX].id = id;
 	device_desc.iSerialNumber = id;

 	/* register our configuration */
 	ret = usb_add_config(cdev, &android_config_driver, android_bind_config);
 	if (ret) {
 		printk(KERN_ERR "usb_add_config failed\n");
 		return ret;
 	}

 	gcnum = usb_gadget_controller_number(gadget);
 	if (gcnum >= 0)
 		device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
 	else {
 		/* gadget zero is so simple (for now, no altsettings) that
 		 * it SHOULD NOT have problems with bulk-capable hardware.
 		 * so just warn about unrcognized controllers -- don't panic.
 		 *
 		 * things like configuration and altsetting numbering
 		 * can need hardware-specific attention though.
 		 */
 		pr_warning("%s: controller '%s' not recognized\n",
 			longname, gadget->name);
 		device_desc.bcdDevice = __constant_cpu_to_le16(0x9999);
 	}

 	usb_gadget_set_selfpowered(gadget);
 	dev->cdev = cdev;
 	device_desc.idVendor = __constant_cpu_to_le16(get_vendor_id(dev));
 	device_desc.idProduct = __constant_cpu_to_le16(get_product_id(dev));
 	cdev->desc.idVendor = device_desc.idVendor;
 	cdev->desc.idProduct = device_desc.idProduct;

 	return 0;
 }

 static struct usb_composite_driver android_usb_driver = {
 	.name		= "android_usb",
 	.dev		= &device_desc,
 	.strings	= dev_strings,
 	.enable_function = android_enable_function,
 };

 void android_register_function(struct android_usb_function *f)
 {
 	struct android_dev *dev = _android_dev;

 	printk(KERN_INFO "android_register_function %s\n", f->name);
 	list_add_tail(&f->list, &_functions);

 	if (dev && should_bind_functions(dev))
 		bind_functions(dev);
 }

 void update_dev_desc(struct android_dev *dev)
 {
 	struct usb_function *f;
 	struct usb_function *last_enabled_f = NULL;
 	int num_enabled = 0;
 	int has_iad = 0;

 	dev->cdev->desc.bDeviceClass = USB_CLASS_PER_INTERFACE;
 	dev->cdev->desc.bDeviceSubClass = 0x00;
 	dev->cdev->desc.bDeviceProtocol = 0x00;

 	list_for_each_entry(f, &android_config_driver.functions, list) {
 		if (!f->disabled) {
 			num_enabled++;
 			last_enabled_f = f;
 			if (f->descriptors[0]->bDescriptorType ==
 					USB_DT_INTERFACE_ASSOCIATION)
 				has_iad = 1;
 		}
 		if (num_enabled > 1 && has_iad) {
 			dev->cdev->desc.bDeviceClass = USB_CLASS_MISC;
 			dev->cdev->desc.bDeviceSubClass = 0x02;
 			dev->cdev->desc.bDeviceProtocol = 0x01;
 			break;
 		}
 	}

 	if (num_enabled == 1) {
 #ifdef CONFIG_USB_ANDROID_RNDIS
 		if (!strcmp(last_enabled_f->name, "rndis")) {
 #ifdef CONFIG_USB_ANDROID_RNDIS_WCEIS
 			dev->cdev->desc.bDeviceClass =
 					USB_CLASS_WIRELESS_CONTROLLER;
 #else
 			dev->cdev->desc.bDeviceClass = USB_CLASS_COMM;
 #endif
 		}
 #endif
 	}
 }

 void android_enable_function(struct usb_function *f, int enable)
 {
 	struct android_dev *dev = _android_dev;
 	int disable = !enable;

 	if (!!f->disabled != disable) {
 		usb_function_set_enabled(f, !disable);

 #ifdef CONFIG_USB_ANDROID_RNDIS
 		if (!strcmp(f->name, "rndis")) {
 			struct usb_function		*func;
 			/* Windows does not support other interfaces when RNDIS is enabled,
 			 * so we disable UMS and MTP when RNDIS is on.
 			 */
 			list_for_each_entry(func, &android_config_driver.functions, list) {
 				if (!strcmp(func->name, "usb_mass_storage")
 					|| !strcmp(func->name, "mtp")) {
 					usb_function_set_enabled(func, !enable);
 				}
 			}
 		}
 #endif
 #ifdef CONFIG_USB_ANDROID_ACCESSORY
 		if (!strcmp(f->name, "accessory") && enable) {
 			struct usb_function		*func;

 		    /* disable everything else (and keep adb for now) */
 			list_for_each_entry(func, &android_config_driver.functions, list) {
 				if (strcmp(func->name, "accessory")
 					&& strcmp(func->name, "adb")) {
 					usb_function_set_enabled(func, 0);
 				}
 			}
         }
 #endif

 		update_dev_desc(dev);

 		device_desc.idVendor = __constant_cpu_to_le16(get_vendor_id(dev));
 		device_desc.idProduct = __constant_cpu_to_le16(get_product_id(dev));
 		if (dev->cdev) {
 			dev->cdev->desc.idVendor = device_desc.idVendor;
 			dev->cdev->desc.idProduct = device_desc.idProduct;
 		}
 		usb_composite_force_reset(dev->cdev);
 	}
 }

 static int android_probe(struct platform_device *pdev)
 {
 	struct android_usb_platform_data *pdata = pdev->dev.platform_data;
 	struct android_dev *dev = _android_dev;

 	printk(KERN_INFO "android_probe pdata: %p\n", pdata);

 	if (pdata) {
 		dev->products = pdata->products;
 		dev->num_products = pdata->num_products;
 		dev->functions = pdata->functions;
 		dev->num_functions = pdata->num_functions;
 		if (pdata->vendor_id) {
 			dev->vendor_id = pdata->vendor_id;
 			device_desc.idVendor =
 				__constant_cpu_to_le16(pdata->vendor_id);
 		}
 		if (pdata->product_id) {
 			dev->product_id = pdata->product_id;
 			device_desc.idProduct =
 				__constant_cpu_to_le16(pdata->product_id);
 		}
 		if (pdata->version)
 			dev->version = pdata->version;

 		if (pdata->product_name)
 			strings_dev[STRING_PRODUCT_IDX].s = pdata->product_name;
 		if (pdata->manufacturer_name)
 			strings_dev[STRING_MANUFACTURER_IDX].s =
 					pdata->manufacturer_name;
 		if (pdata->serial_number)
 			strings_dev[STRING_SERIAL_IDX].s = pdata->serial_number;
 	}

 	return usb_composite_probe(&android_usb_driver, android_bind);
 }

 static struct platform_driver android_platform_driver = {
 	.driver = { .name = "android_usb", },
 	.probe = android_probe,
 };

 static int __init init(void)
 {
 	struct android_dev *dev;

 	printk(KERN_INFO "android init\n");

 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 	if (!dev)
 		return -ENOMEM;

 	/* set default values, which should be overridden by platform data */
 	dev->product_id = PRODUCT_ID;
 	_android_dev = dev;

 	return platform_driver_register(&android_platform_driver);
 }
 module_init(init);

 static void __exit cleanup(void)
 {
 	usb_composite_unregister(&android_usb_driver);
 	platform_driver_unregister(&android_platform_driver);
 	kfree(_android_dev);
 	_android_dev = NULL;
 }
 module_exit(cleanup);
	/*
	* Gadget Driver for Android
	*
	* Copyright (C) 2008 Google, Inc.
	* Author: Mike Lockwood <lockwood@android.com>
	*
	* This software is licensed under the terms of the GNU General Public
	* License version 2, as published by the Free Software Foundation, and
	* may be copied, distributed, and modified under those terms.
	*
	* 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.
	*
	*/

	/* #define DEBUG */
	/* #define VERBOSE_DEBUG */

	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/fs.h>

	#include <linux/delay.h>
	#include <linux/kernel.h>
	#include <linux/utsname.h>
	#include <linux/platform_device.h>

	#include <linux/usb/android_composite.h>
	#include <linux/usb/ch9.h>
	#include <linux/usb/composite.h>
	#include <linux/usb/gadget.h>

	#include "gadget_chips.h"

	/*
	* Kbuild is not very cooperative with respect to linking separately
	* compiled library objects into one module. So for now we won't use
	* separate compilation ... ensuring init/exit sections work to shrink
	* the runtime footprint, and giving us at least some parts of what
	* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
	*/
	#include "usbstring.c"
	#include "config.c"
	#include "epautoconf.c"
	#include "composite.c"

	MODULE_AUTHOR("Mike Lockwood");
	MODULE_DESCRIPTION("Android Composite USB Driver");
	MODULE_LICENSE("GPL");
	MODULE_VERSION("1.0");

	static const char longname[] = "Gadget Android";

	/* Default vendor and product IDs, overridden by platform data */
	#define VENDOR_ID 0x18D1
	#define PRODUCT_ID 0x0001

	struct android_dev {
	struct usb_composite_dev *cdev;
	struct usb_configuration *config;
	int num_products;
	struct android_usb_product *products;
	int num_functions;
	char **functions;

	int vendor_id;
	int product_id;
	int version;
	};

	static struct android_dev *_android_dev;

	/* string IDs are assigned dynamically */

	#define STRING_MANUFACTURER_IDX 0
	#define STRING_PRODUCT_IDX 1
	#define STRING_SERIAL_IDX 2

	/* String Table */
	static struct usb_string strings_dev[] = {
	/* These dummy values should be overridden by platform data */
	[STRING_MANUFACTURER_IDX].s = "Android",
	[STRING_PRODUCT_IDX].s = "Android",
	[STRING_SERIAL_IDX].s = "0123456789ABCDEF",
	{ } /* end of list */
	};

	static struct usb_gadget_strings stringtab_dev = {
	.language = 0x0409, /* en-us */
	.strings = strings_dev,
	};

	static struct usb_gadget_strings *dev_strings[] = {
	&stringtab_dev,
	NULL,
	};

	static struct usb_device_descriptor device_desc = {
	.bLength = sizeof(device_desc),
	.bDescriptorType = USB_DT_DEVICE,
	.bcdUSB = __constant_cpu_to_le16(0x0200),
	.bDeviceClass = USB_CLASS_PER_INTERFACE,
	.idVendor = __constant_cpu_to_le16(VENDOR_ID),
	.idProduct = __constant_cpu_to_le16(PRODUCT_ID),
	.bcdDevice = __constant_cpu_to_le16(0xffff),
	.bNumConfigurations = 1,
	};

	static struct list_head _functions = LIST_HEAD_INIT(_functions);
	static bool _are_functions_bound;

	static struct android_usb_function get_function(const char name)
	{
	struct android_usb_function *f;
	list_for_each_entry(f, &_functions, list) {
	if (!strcmp(name, f->name))
	return f;
	}
	return 0;
	}

	static bool are_functions_registered(struct android_dev *dev)
	{
	char **functions = dev->functions;
	int i;

	/* Look only for functions required by the board config */
	for (i = 0; i < dev->num_functions; i++) {
	char name = functions++;
	bool is_match = false;
	/* Could reuse get_function() here, but a reverse search
	* should yield less comparisons overall */
	struct android_usb_function *f;
	list_for_each_entry_reverse(f, &_functions, list) {
	if (!strcmp(name, f->name)) {
	is_match = true;
	break;
	}
	}
	if (is_match)
	continue;
	else
	return false;
	}

	return true;
	}

	static bool should_bind_functions(struct android_dev *dev)
	{
	/* Don't waste time if the main driver hasn't bound */
	if (!dev->config)
	return false;

	/* Don't waste time if we've already bound the functions */
	if (_are_functions_bound)
	return false;

	/* This call is the most costly, so call it last */
	if (!are_functions_registered(dev))
	return false;

	return true;
	}

	static void bind_functions(struct android_dev *dev)
	{
	struct android_usb_function *f;
	char **functions = dev->functions;
	int i;

	for (i = 0; i < dev->num_functions; i++) {
	char name = functions++;
	f = get_function(name);
	if (f)
	f->bind_config(dev->config);
	else
	printk(KERN_ERR "function %s not found in bind_functions\n", name);
	}

	_are_functions_bound = true;
	}

	static int android_bind_config(struct usb_configuration *c)
	{
	struct android_dev *dev = _android_dev;

	printk(KERN_DEBUG "android_bind_config\n");
	dev->config = c;

	if (should_bind_functions(dev))
	bind_functions(dev);

	return 0;
	}

	static int android_setup_config(struct usb_configuration *c,
	const struct usb_ctrlrequest *ctrl);

	static struct usb_configuration android_config_driver = {
	.label = "android",
	.setup = android_setup_config,
	.bConfigurationValue = 1,
	.bmAttributes = USB_CONFIG_ATT_ONE \| USB_CONFIG_ATT_SELFPOWER,
	.bMaxPower = 0xFA, /* 500ma */
	};

	static int android_setup_config(struct usb_configuration *c,
	const struct usb_ctrlrequest *ctrl)
	{
	int i;
	int ret = -EOPNOTSUPP;

	for (i = 0; i < android_config_driver.next_interface_id; i++) {
	if (android_config_driver.interface[i]->setup) {
	ret = android_config_driver.interface[i]->setup(
	android_config_driver.interface[i], ctrl);
	if (ret >= 0)
	return ret;
	}
	}
	return ret;
	}

	static int product_has_function(struct android_usb_product *p,
	struct usb_function *f)
	{
	char **functions = p->functions;
	int count = p->num_functions;
	const char *name = f->name;
	int i;

	for (i = 0; i < count; i++) {
	/* For functions with multiple instances, usb_function.name
	* will have an index appended to the core name (ex: acm0),
	* while android_usb_product.functions[i] will only have the
	* core name (ex: acm). So, only compare up to the length of
	* android_usb_product.functions[i].
	*/
	if (!strncmp(name, functions[i], strlen(functions[i])))
	return 1;
	}
	return 0;
	}

	static int product_matches_functions(struct android_usb_product *p)
	{
	struct usb_function *f;
	list_for_each_entry(f, &android_config_driver.functions, list) {
	if (product_has_function(p, f) == !!f->disabled)
	return 0;
	}
	return 1;
	}

	static int get_vendor_id(struct android_dev *dev)
	{
	struct android_usb_product *p = dev->products;
	int count = dev->num_products;
	int i;

	if (p) {
	for (i = 0; i < count; i++, p++) {
	if (p->vendor_id && product_matches_functions(p))
	return p->vendor_id;
	}
	}
	/* use default vendor ID */
	return dev->vendor_id;
	}

	static int get_product_id(struct android_dev *dev)
	{
	struct android_usb_product *p = dev->products;
	int count = dev->num_products;
	int i;

	if (p) {
	for (i = 0; i < count; i++, p++) {
	if (product_matches_functions(p))
	return p->product_id;
	}
	}
	/* use default product ID */
	return dev->product_id;
	}

	static int android_bind(struct usb_composite_dev *cdev)
	{
	struct android_dev *dev = _android_dev;
	struct usb_gadget *gadget = cdev->gadget;
	int gcnum, id, ret;

	printk(KERN_INFO "android_bind\n");

	/* Allocate string descriptor numbers ... note that string
	* contents can be overridden by the composite_dev glue.
	*/
	id = usb_string_id(cdev);
	if (id < 0)
	return id;
	strings_dev[STRING_MANUFACTURER_IDX].id = id;
	device_desc.iManufacturer = id;

	id = usb_string_id(cdev);
	if (id < 0)
	return id;
	strings_dev[STRING_PRODUCT_IDX].id = id;
	device_desc.iProduct = id;

	id = usb_string_id(cdev);
	if (id < 0)
	return id;
	strings_dev[STRING_SERIAL_IDX].id = id;
	device_desc.iSerialNumber = id;

	/* register our configuration */
	ret = usb_add_config(cdev, &android_config_driver, android_bind_config);
	if (ret) {
	printk(KERN_ERR "usb_add_config failed\n");
	return ret;
	}

	gcnum = usb_gadget_controller_number(gadget);
	if (gcnum >= 0)
	device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
	else {
	/* gadget zero is so simple (for now, no altsettings) that
	* it SHOULD NOT have problems with bulk-capable hardware.
	* so just warn about unrcognized controllers -- don't panic.
	*
	* things like configuration and altsetting numbering
	* can need hardware-specific attention though.
	*/
	pr_warning("%s: controller '%s' not recognized\n",
	longname, gadget->name);
	device_desc.bcdDevice = __constant_cpu_to_le16(0x9999);
	}

	usb_gadget_set_selfpowered(gadget);
	dev->cdev = cdev;
	device_desc.idVendor = __constant_cpu_to_le16(get_vendor_id(dev));
	device_desc.idProduct = __constant_cpu_to_le16(get_product_id(dev));
	cdev->desc.idVendor = device_desc.idVendor;
	cdev->desc.idProduct = device_desc.idProduct;

	return 0;
	}

	static struct usb_composite_driver android_usb_driver = {
	.name = "android_usb",
	.dev = &device_desc,
	.strings = dev_strings,
	.enable_function = android_enable_function,
	};

	void android_register_function(struct android_usb_function *f)
	{
	struct android_dev *dev = _android_dev;

	printk(KERN_INFO "android_register_function %s\n", f->name);
	list_add_tail(&f->list, &_functions);

	if (dev && should_bind_functions(dev))
	bind_functions(dev);
	}

	void update_dev_desc(struct android_dev *dev)
	{
	struct usb_function *f;
	struct usb_function *last_enabled_f = NULL;
	int num_enabled = 0;
	int has_iad = 0;

	dev->cdev->desc.bDeviceClass = USB_CLASS_PER_INTERFACE;
	dev->cdev->desc.bDeviceSubClass = 0x00;
	dev->cdev->desc.bDeviceProtocol = 0x00;

	list_for_each_entry(f, &android_config_driver.functions, list) {
	if (!f->disabled) {
	num_enabled++;
	last_enabled_f = f;
	if (f->descriptors[0]->bDescriptorType ==
	USB_DT_INTERFACE_ASSOCIATION)
	has_iad = 1;
	}
	if (num_enabled > 1 && has_iad) {
	dev->cdev->desc.bDeviceClass = USB_CLASS_MISC;
	dev->cdev->desc.bDeviceSubClass = 0x02;
	dev->cdev->desc.bDeviceProtocol = 0x01;
	break;
	}
	}

	if (num_enabled == 1) {
	#ifdef CONFIG_USB_ANDROID_RNDIS
	if (!strcmp(last_enabled_f->name, "rndis")) {
	#ifdef CONFIG_USB_ANDROID_RNDIS_WCEIS
	dev->cdev->desc.bDeviceClass =
	USB_CLASS_WIRELESS_CONTROLLER;
	#else
	dev->cdev->desc.bDeviceClass = USB_CLASS_COMM;
	#endif
	}
	#endif
	}
	}

	void android_enable_function(struct usb_function *f, int enable)
	{
	struct android_dev *dev = _android_dev;
	int disable = !enable;

	if (!!f->disabled != disable) {
	usb_function_set_enabled(f, !disable);

	#ifdef CONFIG_USB_ANDROID_RNDIS
	if (!strcmp(f->name, "rndis")) {
	struct usb_function *func;
	/* Windows does not support other interfaces when RNDIS is enabled,
	* so we disable UMS and MTP when RNDIS is on.
	*/
	list_for_each_entry(func, &android_config_driver.functions, list) {
	if (!strcmp(func->name, "usb_mass_storage")
	\|\| !strcmp(func->name, "mtp")) {
	usb_function_set_enabled(func, !enable);
	}
	}
	}
	#endif
	#ifdef CONFIG_USB_ANDROID_ACCESSORY
	if (!strcmp(f->name, "accessory") && enable) {
	struct usb_function *func;

	/* disable everything else (and keep adb for now) */
	list_for_each_entry(func, &android_config_driver.functions, list) {
	if (strcmp(func->name, "accessory")
	&& strcmp(func->name, "adb")) {
	usb_function_set_enabled(func, 0);
	}
	}
	}
	#endif

	update_dev_desc(dev);

	device_desc.idVendor = __constant_cpu_to_le16(get_vendor_id(dev));
	device_desc.idProduct = __constant_cpu_to_le16(get_product_id(dev));
	if (dev->cdev) {
	dev->cdev->desc.idVendor = device_desc.idVendor;
	dev->cdev->desc.idProduct = device_desc.idProduct;
	}
	usb_composite_force_reset(dev->cdev);
	}
	}

	static int android_probe(struct platform_device *pdev)
	{
	struct android_usb_platform_data *pdata = pdev->dev.platform_data;
	struct android_dev *dev = _android_dev;

	printk(KERN_INFO "android_probe pdata: %p\n", pdata);

	if (pdata) {
	dev->products = pdata->products;
	dev->num_products = pdata->num_products;
	dev->functions = pdata->functions;
	dev->num_functions = pdata->num_functions;
	if (pdata->vendor_id) {
	dev->vendor_id = pdata->vendor_id;
	device_desc.idVendor =
	__constant_cpu_to_le16(pdata->vendor_id);
	}
	if (pdata->product_id) {
	dev->product_id = pdata->product_id;
	device_desc.idProduct =
	__constant_cpu_to_le16(pdata->product_id);
	}
	if (pdata->version)
	dev->version = pdata->version;

	if (pdata->product_name)
	strings_dev[STRING_PRODUCT_IDX].s = pdata->product_name;
	if (pdata->manufacturer_name)
	strings_dev[STRING_MANUFACTURER_IDX].s =
	pdata->manufacturer_name;
	if (pdata->serial_number)
	strings_dev[STRING_SERIAL_IDX].s = pdata->serial_number;
	}

	return usb_composite_probe(&android_usb_driver, android_bind);
	}

	static struct platform_driver android_platform_driver = {
	.driver = { .name = "android_usb", },
	.probe = android_probe,
	};

	static int __init init(void)
	{
	struct android_dev *dev;

	printk(KERN_INFO "android init\n");

	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev)
	return -ENOMEM;

	/* set default values, which should be overridden by platform data */
	dev->product_id = PRODUCT_ID;
	_android_dev = dev;

	return platform_driver_register(&android_platform_driver);
	}
	module_init(init);

	static void __exit cleanup(void)
	{
	usb_composite_unregister(&android_usb_driver);
	platform_driver_unregister(&android_platform_driver);
	kfree(_android_dev);
	_android_dev = NULL;
	}
	module_exit(cleanup);