android_usb: Composite USB gadget driver for android.

Change-Id: I4101540916b73a5f4e48684727ff782f98b969c7
Signed-off-by: Mike Lockwood <lockwood@android.com>

USB: android gadget: add remote wakeup attribute to android function

Add remote wakeup attribute to configuration descriptor of android
function to advertise remote wakeup capability to host

Acked-by: Allam, Suresh Reddy <sallam@qualcomm.com>

Signed-off-by: Mike Lockwood <lockwood@android.com>

usb gadget: link fixes for android composite gadget

Signed-off-by: Mike Lockwood <lockwood@android.com>

usb gadget: Fix null pointer errors in android composite driver

Signed-off-by: Mike Lockwood <lockwood@android.com>

usb: gadget: android: Allow usb charging to draw up to 500mA instead of 250.

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>

usb gadget: android: Add helper function for usb_gadget_connect and disconnect.

Signed-off-by: Mike Lockwood <lockwood@android.com>

drivers: usb: gadget: call switch_dev_unregister in mass storage unbind callback

This fixes a problem unloading the android gadget driver when built as a module

Signed-off-by: Mike Lockwood <lockwood@android.com>

usb: gadget: android: Add dependency on switch driver.

Signed-off-by: Mike Lockwood <lockwood@android.com>

USB: gadget: android: Fix USB WHQL Certification Issues

Submitted on behalf of RaviKumar Vembu <ravi.v@motorola.com>
Signed-off-by: Jared Suttles <jared.suttles@motorola.com>
Signed-off-by: Mike Lockwood <lockwood@android.com>

drivers: usb: gadget: Add "usb_mass_storage" platform driver.

This will be used for configuring vendor, product and release from board file.

Submitted on behalf of RaviKumar Vembu <ravi.v@motorola.com>
Signed-off-by: Jared Suttles <jared.suttles@motorola.com>
Signed-off-by: Mike Lockwood <lockwood@android.com>

drivers: usb: gadget: Use usb_mass_storage platform device as parent for lun

If a platform device is specified for the f_mass_storage function, use it as the
parent driver for the lun files in sysfs.
This allows a platform independent file path for controlling USB mass storage
from user space.

Signed-off-by: Mike Lockwood <lockwood@android.com>

drivers: usb: gadget: Add platform data struct for usb_mass_storage device

Signed-off-by: Mike Lockwood <lockwood@android.com>

usb: gadget: mass_storage: Fix Mass Storage Panic during PC reboot

Submitted on behalf of RaviKumar Vembu <ravi.v@motorola.com>
Signed-off-by: Jared Suttles <jared.suttles@motorola.com>
Signed-off-by: Mike Lockwood <lockwood@android.com>

usb: gadget: f_mass_storage: Handle setup request correctly

Signed-off-by: Mike Lockwood <lockwood@android.com>

usb: gadget: f_mass_storage: Clean up wakelocks on error paths

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
Signed-off-by: Mike Lockwood <lockwood@android.com>

drivers/usb/gadget/Kconfig

@@ -935,6 +935,15 @@ config USB_G_PRINTER
 	  For more information, see Documentation/usb/gadget_printer.txt
 	  which includes sample code for accessing the device file.
 
+config USB_ANDROID
+	tristate "Android Gadget"
+	depends on SWITCH
+	help
+	  The Android gadget provides mass storage and adb transport.
+
+	  Say "y" to link the driver statically, or "m" to build a
+	  dynamically linked module called "g_android".
+
 config USB_CDC_COMPOSITE
 	tristate "CDC Composite Device (Ethernet and ACM)"
 	depends on NET

drivers/usb/gadget/Makefile

@@ -49,6 +49,7 @@ g_dbgp-y			:= dbgp.o
 g_nokia-y			:= nokia.o
 g_webcam-y			:= webcam.o
 g_ncm-y				:= ncm.o
+g_android-y			:= android.o f_adb.o f_mass_storage_tmp.o
 
 obj-$(CONFIG_USB_ZERO)		+= g_zero.o
 obj-$(CONFIG_USB_AUDIO)		+= g_audio.o
@@ -67,3 +68,4 @@ obj-$(CONFIG_USB_G_MULTI)	+= g_multi.o
 obj-$(CONFIG_USB_G_NOKIA)	+= g_nokia.o
 obj-$(CONFIG_USB_G_WEBCAM)	+= g_webcam.o
 obj-$(CONFIG_USB_G_NCM)		+= g_ncm.o
+obj-$(CONFIG_USB_ANDROID)	+= g_android.o

drivers/usb/gadget/android.c

@@ -0,0 +1,351 @@
+/*
+ * 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/miscdevice.h>
+#include <linux/platform_device.h>
+
+#include <linux/usb/android.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/composite.h>
+#include <linux/usb/gadget.h>
+
+#include "f_mass_storage.h"
+#include "f_adb.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
+#define ADB_PRODUCT_ID	0x0002
+
+struct android_dev {
+	struct usb_composite_dev *cdev;
+
+	int product_id;
+	int adb_product_id;
+	int version;
+
+	int adb_enabled;
+	int nluns;
+};
+
+static atomic_t adb_enable_excl;
+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,
+};
+
+void android_usb_set_connected(int connected)
+{
+	if (_android_dev && _android_dev->cdev && _android_dev->cdev->gadget) {
+		if (connected)
+			usb_gadget_connect(_android_dev->cdev->gadget);
+		else
+			usb_gadget_disconnect(_android_dev->cdev->gadget);
+	}
+}
+
+static int __init android_bind_config(struct usb_configuration *c)
+{
+	struct android_dev *dev = _android_dev;
+	int ret;
+	printk(KERN_DEBUG "android_bind_config\n");
+
+	ret = mass_storage_function_add(dev->cdev, c, dev->nluns);
+	if (ret)
+		return ret;
+	return adb_function_add(dev->cdev, c);
+}
+
+static struct usb_configuration android_config_driver = {
+	.label		= "android",
+	.bind		= android_bind_config,
+	.bConfigurationValue = 1,
+	.bmAttributes	= USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
+	.bMaxPower	= 0xFA, /* 500ma */
+};
+
+static int __init android_bind(struct usb_composite_dev *cdev)
+{
+	struct android_dev *dev = _android_dev;
+	struct usb_gadget	*gadget = cdev->gadget;
+	int			gcnum;
+	int			id;
+	int			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);
+	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;
+
+	return 0;
+}
+
+static struct usb_composite_driver android_usb_driver = {
+	.name		= "android_usb",
+	.dev		= &device_desc,
+	.strings	= dev_strings,
+	.bind		= android_bind,
+};
+
+static void enable_adb(struct android_dev *dev, int enable)
+{
+	if (enable != dev->adb_enabled) {
+		dev->adb_enabled = enable;
+		adb_function_enable(enable);
+
+		/* set product ID to the appropriate value */
+		if (enable)
+			device_desc.idProduct =
+				__constant_cpu_to_le16(dev->adb_product_id);
+		else
+			device_desc.idProduct =
+				__constant_cpu_to_le16(dev->product_id);
+		if (dev->cdev)
+			dev->cdev->desc.idProduct = device_desc.idProduct;
+
+		/* force reenumeration */
+		if (dev->cdev && dev->cdev->gadget &&
+				dev->cdev->gadget->speed != USB_SPEED_UNKNOWN) {
+			usb_gadget_disconnect(dev->cdev->gadget);
+			msleep(10);
+			usb_gadget_connect(dev->cdev->gadget);
+		}
+	}
+}
+
+static int adb_enable_open(struct inode *ip, struct file *fp)
+{
+	if (atomic_inc_return(&adb_enable_excl) != 1) {
+		atomic_dec(&adb_enable_excl);
+		return -EBUSY;
+	}
+
+	printk(KERN_INFO "enabling adb\n");
+	enable_adb(_android_dev, 1);
+
+	return 0;
+}
+
+static int adb_enable_release(struct inode *ip, struct file *fp)
+{
+	printk(KERN_INFO "disabling adb\n");
+	enable_adb(_android_dev, 0);
+	atomic_dec(&adb_enable_excl);
+	return 0;
+}
+
+static const struct file_operations adb_enable_fops = {
+	.owner =   THIS_MODULE,
+	.open =    adb_enable_open,
+	.release = adb_enable_release,
+};
+
+static struct miscdevice adb_enable_device = {
+	.minor = MISC_DYNAMIC_MINOR,
+	.name = "android_adb_enable",
+	.fops = &adb_enable_fops,
+};
+
+static int __init 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) {
+		if (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->adb_product_id)
+			dev->adb_product_id = pdata->adb_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;
+		dev->nluns = pdata->nluns;
+	}
+
+	return 0;
+}
+
+static struct platform_driver android_platform_driver = {
+	.driver = { .name = "android_usb", },
+	.probe = android_probe,
+};
+
+static int __init init(void)
+{
+	struct android_dev *dev;
+	int ret;
+
+	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;
+	dev->adb_product_id = ADB_PRODUCT_ID;
+	_android_dev = dev;
+
+	ret = platform_driver_register(&android_platform_driver);
+	if (ret)
+		return ret;
+	ret = misc_register(&adb_enable_device);
+	if (ret) {
+		platform_driver_unregister(&android_platform_driver);
+		return ret;
+	}
+	ret = usb_composite_register(&android_usb_driver);
+	if (ret) {
+		misc_deregister(&adb_enable_device);
+		platform_driver_unregister(&android_platform_driver);
+	}
+	return ret;
+}
+module_init(init);
+
+static void __exit cleanup(void)
+{
+	usb_composite_unregister(&android_usb_driver);
+	misc_deregister(&adb_enable_device);
+	platform_driver_unregister(&android_platform_driver);
+	kfree(_android_dev);
+	_android_dev = NULL;
+}
+module_exit(cleanup);

drivers/usb/gadget/f_adb.c

@@ -0,0 +1,668 @@
+/*
+ * Gadget Driver for Android ADB
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <linux/delay.h>
+#include <linux/wait.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/device.h>
+#include <linux/miscdevice.h>
+
+#include <linux/usb/ch9.h>
+#include <linux/usb/composite.h>
+#include <linux/usb/gadget.h>
+
+#include "f_adb.h"
+
+#define BULK_BUFFER_SIZE           4096
+
+/* number of rx and tx requests to allocate */
+#define RX_REQ_MAX 4
+#define TX_REQ_MAX 4
+
+static const char shortname[] = "android_adb";
+
+struct adb_dev {
+	struct usb_function function;
+	struct usb_composite_dev *cdev;
+	spinlock_t lock;
+
+	struct usb_ep *ep_in;
+	struct usb_ep *ep_out;
+
+	int online;
+	int error;
+
+	atomic_t read_excl;
+	atomic_t write_excl;
+	atomic_t open_excl;
+
+	struct list_head tx_idle;
+	struct list_head rx_idle;
+	struct list_head rx_done;
+
+	wait_queue_head_t read_wq;
+	wait_queue_head_t write_wq;
+
+	/* the request we're currently reading from */
+	struct usb_request *read_req;
+	unsigned char *read_buf;
+	unsigned read_count;
+};
+
+static struct usb_interface_descriptor adb_interface_desc = {
+	.bLength                = USB_DT_INTERFACE_SIZE,
+	.bDescriptorType        = USB_DT_INTERFACE,
+	.bInterfaceNumber       = 0,
+	.bNumEndpoints          = 2,
+	.bInterfaceClass        = 0xFF,
+	.bInterfaceSubClass     = 0x42,
+	.bInterfaceProtocol     = 1,
+};
+
+static struct usb_endpoint_descriptor adb_highspeed_in_desc = {
+	.bLength                = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType        = USB_DT_ENDPOINT,
+	.bEndpointAddress       = USB_DIR_IN,
+	.bmAttributes           = USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize         = __constant_cpu_to_le16(512),
+};
+
+static struct usb_endpoint_descriptor adb_highspeed_out_desc = {
+	.bLength                = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType        = USB_DT_ENDPOINT,
+	.bEndpointAddress       = USB_DIR_OUT,
+	.bmAttributes           = USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize         = __constant_cpu_to_le16(512),
+};
+
+static struct usb_endpoint_descriptor adb_fullspeed_in_desc = {
+	.bLength                = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType        = USB_DT_ENDPOINT,
+	.bEndpointAddress       = USB_DIR_IN,
+	.bmAttributes           = USB_ENDPOINT_XFER_BULK,
+};
+
+static struct usb_endpoint_descriptor adb_fullspeed_out_desc = {
+	.bLength                = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType        = USB_DT_ENDPOINT,
+	.bEndpointAddress       = USB_DIR_OUT,
+	.bmAttributes           = USB_ENDPOINT_XFER_BULK,
+};
+
+static struct usb_descriptor_header *fs_adb_descs[] = {
+	(struct usb_descriptor_header *) &adb_interface_desc,
+	(struct usb_descriptor_header *) &adb_fullspeed_in_desc,
+	(struct usb_descriptor_header *) &adb_fullspeed_out_desc,
+	NULL,
+};
+
+static struct usb_descriptor_header *hs_adb_descs[] = {
+	(struct usb_descriptor_header *) &adb_interface_desc,
+	(struct usb_descriptor_header *) &adb_highspeed_in_desc,
+	(struct usb_descriptor_header *) &adb_highspeed_out_desc,
+	NULL,
+};
+
+/* used when adb function is disabled */
+static struct usb_descriptor_header *null_adb_descs[] = {
+	NULL,
+};
+
+
+/* temporary variable used between adb_open() and adb_gadget_bind() */
+static struct adb_dev *_adb_dev;
+
+static inline struct adb_dev *func_to_dev(struct usb_function *f)
+{
+	return container_of(f, struct adb_dev, function);
+}
+
+
+static struct usb_request *adb_request_new(struct usb_ep *ep, int buffer_size)
+{
+	struct usb_request *req = usb_ep_alloc_request(ep, GFP_KERNEL);
+	if (!req)
+		return NULL;
+
+	/* now allocate buffers for the requests */
+	req->buf = kmalloc(buffer_size, GFP_KERNEL);
+	if (!req->buf) {
+		usb_ep_free_request(ep, req);
+		return NULL;
+	}
+
+	return req;
+}
+
+static void adb_request_free(struct usb_request *req, struct usb_ep *ep)
+{
+	if (req) {
+		kfree(req->buf);
+		usb_ep_free_request(ep, req);
+	}
+}
+
+static inline int _lock(atomic_t *excl)
+{
+	if (atomic_inc_return(excl) == 1) {
+		return 0;
+	} else {
+		atomic_dec(excl);
+		return -1;
+	}
+}
+
+static inline void _unlock(atomic_t *excl)
+{
+	atomic_dec(excl);
+}
+
+/* add a request to the tail of a list */
+void req_put(struct adb_dev *dev, struct list_head *head,
+		struct usb_request *req)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->lock, flags);
+	list_add_tail(&req->list, head);
+	spin_unlock_irqrestore(&dev->lock, flags);
+}
+
+/* remove a request from the head of a list */
+struct usb_request *req_get(struct adb_dev *dev, struct list_head *head)
+{
+	unsigned long flags;
+	struct usb_request *req;
+
+	spin_lock_irqsave(&dev->lock, flags);
+	if (list_empty(head)) {
+		req = 0;
+	} else {
+		req = list_first_entry(head, struct usb_request, list);
+		list_del(&req->list);
+	}
+	spin_unlock_irqrestore(&dev->lock, flags);
+	return req;
+}
+
+static void adb_complete_in(struct usb_ep *ep, struct usb_request *req)
+{
+	struct adb_dev *dev = _adb_dev;
+
+	if (req->status != 0)
+		dev->error = 1;
+
+	req_put(dev, &dev->tx_idle, req);
+
+	wake_up(&dev->write_wq);
+}
+
+static void adb_complete_out(struct usb_ep *ep, struct usb_request *req)
+{
+	struct adb_dev *dev = _adb_dev;
+
+	if (req->status != 0) {
+		dev->error = 1;
+		req_put(dev, &dev->rx_idle, req);
+	} else {
+		req_put(dev, &dev->rx_done, req);
+	}
+
+	wake_up(&dev->read_wq);
+}
+
+static int __init create_bulk_endpoints(struct adb_dev *dev,
+				struct usb_endpoint_descriptor *in_desc,
+				struct usb_endpoint_descriptor *out_desc)
+{
+	struct usb_composite_dev *cdev = dev->cdev;
+	struct usb_request *req;
+	struct usb_ep *ep;
+	int i;
+
+	DBG(cdev, "create_bulk_endpoints dev: %p\n", dev);
+
+	ep = usb_ep_autoconfig(cdev->gadget, in_desc);
+	if (!ep) {
+		DBG(cdev, "usb_ep_autoconfig for ep_in failed\n");
+		return -ENODEV;
+	}
+	DBG(cdev, "usb_ep_autoconfig for ep_in got %s\n", ep->name);
+	dev->ep_in = ep;
+
+	ep = usb_ep_autoconfig(cdev->gadget, out_desc);
+	if (!ep) {
+		DBG(cdev, "usb_ep_autoconfig for ep_out failed\n");
+		return -ENODEV;
+	}
+	DBG(cdev, "usb_ep_autoconfig for adb ep_out got %s\n", ep->name);
+	dev->ep_out = ep;
+
+	/* now allocate requests for our endpoints */
+	for (i = 0; i < RX_REQ_MAX; i++) {
+		req = adb_request_new(dev->ep_out, BULK_BUFFER_SIZE);
+		if (!req)
+			goto fail;
+		req->complete = adb_complete_out;
+		req_put(dev, &dev->rx_idle, req);
+	}
+
+	for (i = 0; i < TX_REQ_MAX; i++) {
+		req = adb_request_new(dev->ep_in, BULK_BUFFER_SIZE);
+		if (!req)
+			goto fail;
+		req->complete = adb_complete_in;
+		req_put(dev, &dev->tx_idle, req);
+	}
+
+	return 0;
+
+fail:
+	printk(KERN_ERR "adb_bind() could not allocate requests\n");
+	return -1;
+}
+
+static ssize_t adb_read(struct file *fp, char __user *buf,
+				size_t count, loff_t *pos)
+{
+	struct adb_dev *dev = fp->private_data;
+	struct usb_composite_dev *cdev = dev->cdev;
+	struct usb_request *req;
+	int r = count, xfer;
+	int ret;
+
+	DBG(cdev, "adb_read(%d)\n", count);
+
+	if (_lock(&dev->read_excl))
+		return -EBUSY;
+
+	/* we will block until we're online */
+	while (!(dev->online || dev->error)) {
+		DBG(cdev, "adb_read: waiting for online state\n");
+		ret = wait_event_interruptible(dev->read_wq,
+				(dev->online || dev->error));
+		if (ret < 0) {
+			_unlock(&dev->read_excl);
+			return ret;
+		}
+	}
+
+	while (count > 0) {
+		if (dev->error) {
+			DBG(cdev, "adb_read dev->error\n");
+			r = -EIO;
+			break;
+		}
+
+		/* if we have idle read requests, get them queued */
+		while ((req = req_get(dev, &dev->rx_idle))) {
+requeue_req:
+			req->length = BULK_BUFFER_SIZE;
+			ret = usb_ep_queue(dev->ep_out, req, GFP_ATOMIC);
+
+			if (ret < 0) {
+				r = -EIO;
+				dev->error = 1;
+				req_put(dev, &dev->rx_idle, req);
+				goto fail;
+			} else {
+				DBG(cdev, "rx %p queue\n", req);
+			}
+		}
+
+		/* if we have data pending, give it to userspace */
+		if (dev->read_count > 0) {
+			if (dev->read_count < count)
+				xfer = dev->read_count;
+			else
+				xfer = count;
+
+			if (copy_to_user(buf, dev->read_buf, xfer)) {
+				r = -EFAULT;
+				break;
+			}
+			dev->read_buf += xfer;
+			dev->read_count -= xfer;
+			buf += xfer;
+			count -= xfer;
+
+			/* if we've emptied the buffer, release the request */
+			if (dev->read_count == 0) {
+				req_put(dev, &dev->rx_idle, dev->read_req);
+				dev->read_req = 0;
+			}
+			continue;
+		}
+
+		/* wait for a request to complete */
+		req = 0;
+		ret = wait_event_interruptible(dev->read_wq,
+			((req = req_get(dev, &dev->rx_done)) || dev->error));
+		if (req != 0) {
+			/* if we got a 0-len one we need to put it back into
+			** service.  if we made it the current read req we'd
+			** be stuck forever
+			*/
+			if (req->actual == 0)
+				goto requeue_req;
+
+			dev->read_req = req;
+			dev->read_count = req->actual;
+			dev->read_buf = req->buf;
+			DBG(cdev, "rx %p %d\n", req, req->actual);
+		}
+
+		if (ret < 0) {
+			r = ret;
+			break;
+		}
+	}
+
+fail:
+	_unlock(&dev->read_excl);
+	DBG(cdev, "adb_read returning %d\n", r);
+	return r;
+}
+
+static ssize_t adb_write(struct file *fp, const char __user *buf,
+				 size_t count, loff_t *pos)
+{
+	struct adb_dev *dev = fp->private_data;
+	struct usb_composite_dev *cdev = dev->cdev;
+	struct usb_request *req = 0;
+	int r = count, xfer;
+	int ret;
+
+	DBG(cdev, "adb_write(%d)\n", count);
+
+	if (_lock(&dev->write_excl))
+		return -EBUSY;
+
+	while (count > 0) {
+		if (dev->error) {
+			DBG(cdev, "adb_write dev->error\n");
+			r = -EIO;
+			break;
+		}
+
+		/* get an idle tx request to use */
+		req = 0;
+		ret = wait_event_interruptible(dev->write_wq,
+			((req = req_get(dev, &dev->tx_idle)) || dev->error));
+
+		if (ret < 0) {
+			r = ret;
+			break;
+		}
+
+		if (req != 0) {
+			if (count > BULK_BUFFER_SIZE)
+				xfer = BULK_BUFFER_SIZE;
+			else
+				xfer = count;
+			if (copy_from_user(req->buf, buf, xfer)) {
+				r = -EFAULT;
+				break;
+			}
+
+			req->length = xfer;
+			ret = usb_ep_queue(dev->ep_in, req, GFP_ATOMIC);
+			if (ret < 0) {
+				DBG(cdev, "adb_write: xfer error %d\n", ret);
+				dev->error = 1;
+				r = -EIO;
+				break;
+			}
+
+			buf += xfer;
+			count -= xfer;
+
+			/* zero this so we don't try to free it on error exit */
+			req = 0;
+		}
+	}
+
+	if (req)
+		req_put(dev, &dev->tx_idle, req);
+
+	_unlock(&dev->write_excl);
+	DBG(cdev, "adb_write returning %d\n", r);
+	return r;
+}
+
+static int adb_open(struct inode *ip, struct file *fp)
+{
+	printk(KERN_INFO "adb_open\n");
+	if (_lock(&_adb_dev->open_excl))
+		return -EBUSY;
+
+	fp->private_data = _adb_dev;
+
+	/* clear the error latch */
+	_adb_dev->error = 0;
+
+	return 0;
+}
+
+static int adb_release(struct inode *ip, struct file *fp)
+{
+	printk(KERN_INFO "adb_release\n");
+	_unlock(&_adb_dev->open_excl);
+	return 0;
+}
+
+/* file operations for ADB device /dev/android_adb */
+static struct file_operations adb_fops = {
+	.owner = THIS_MODULE,
+	.read = adb_read,
+	.write = adb_write,
+	.open = adb_open,
+	.release = adb_release,
+};
+
+static struct miscdevice adb_device = {
+	.minor = MISC_DYNAMIC_MINOR,
+	.name = shortname,
+	.fops = &adb_fops,
+};
+
+static int __init
+adb_function_bind(struct usb_configuration *c, struct usb_function *f)
+{
+	struct usb_composite_dev *cdev = c->cdev;
+	struct adb_dev	*dev = func_to_dev(f);
+	int			id;
+	int			ret;
+
+	dev->cdev = cdev;
+	DBG(cdev, "adb_function_bind dev: %p\n", dev);
+
+	/* allocate interface ID(s) */
+	id = usb_interface_id(c, f);
+	if (id < 0)
+		return id;
+	adb_interface_desc.bInterfaceNumber = id;
+
+	/* allocate endpoints */
+	ret = create_bulk_endpoints(dev, &adb_fullspeed_in_desc,
+			&adb_fullspeed_out_desc);
+	if (ret)
+		return ret;
+
+	/* support high speed hardware */
+	if (gadget_is_dualspeed(c->cdev->gadget)) {
+		adb_highspeed_in_desc.bEndpointAddress =
+			adb_fullspeed_in_desc.bEndpointAddress;
+		adb_highspeed_out_desc.bEndpointAddress =
+			adb_fullspeed_out_desc.bEndpointAddress;
+	}
+
+	DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n",
+			gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
+			f->name, dev->ep_in->name, dev->ep_out->name);
+	return 0;
+}
+
+static void
+adb_function_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+	struct adb_dev	*dev = func_to_dev(f);
+	struct usb_request *req;
+
+	spin_lock_irq(&dev->lock);
+
+	while ((req = req_get(dev, &dev->rx_idle)))
+		adb_request_free(req, dev->ep_out);
+	while ((req = req_get(dev, &dev->tx_idle)))
+		adb_request_free(req, dev->ep_in);
+
+	dev->online = 0;
+	dev->error = 1;
+	spin_unlock_irq(&dev->lock);
+
+	misc_deregister(&adb_device);
+	kfree(_adb_dev);
+	_adb_dev = NULL;
+}
+
+static int adb_function_set_alt(struct usb_function *f,
+		unsigned intf, unsigned alt)
+{
+	struct adb_dev	*dev = func_to_dev(f);
+	struct usb_composite_dev *cdev = f->config->cdev;
+	int ret;
+
+	DBG(cdev, "adb_function_set_alt intf: %d alt: %d\n", intf, alt);
+	ret = usb_ep_enable(dev->ep_in,
+			ep_choose(cdev->gadget,
+				&adb_highspeed_in_desc,
+				&adb_fullspeed_in_desc));
+	if (ret)
+		return ret;
+	ret = usb_ep_enable(dev->ep_out,
+			ep_choose(cdev->gadget,
+				&adb_highspeed_out_desc,
+				&adb_fullspeed_out_desc));
+	if (ret) {
+		usb_ep_disable(dev->ep_in);
+		return ret;
+	}
+	dev->online = 1;
+
+	/* readers may be blocked waiting for us to go online */
+	wake_up(&dev->read_wq);
+	return 0;
+}
+
+static void adb_function_disable(struct usb_function *f)
+{
+	struct adb_dev	*dev = func_to_dev(f);
+	struct usb_composite_dev	*cdev = dev->cdev;
+
+	DBG(cdev, "adb_function_disable\n");
+	dev->online = 0;
+	dev->error = 1;
+	usb_ep_disable(dev->ep_in);
+	usb_ep_disable(dev->ep_out);
+
+	/* readers may be blocked waiting for us to go online */
+	wake_up(&dev->read_wq);
+
+	VDBG(cdev, "%s disabled\n", dev->function.name);
+}
+
+int __init adb_function_add(struct usb_composite_dev *cdev,
+	struct usb_configuration *c)
+{
+	struct adb_dev *dev;
+	int ret;
+
+	printk(KERN_INFO "adb_function_add\n");
+
+	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	spin_lock_init(&dev->lock);
+
+	init_waitqueue_head(&dev->read_wq);
+	init_waitqueue_head(&dev->write_wq);
+
+	atomic_set(&dev->open_excl, 0);
+	atomic_set(&dev->read_excl, 0);
+	atomic_set(&dev->write_excl, 0);
+
+	INIT_LIST_HEAD(&dev->rx_idle);
+	INIT_LIST_HEAD(&dev->rx_done);
+	INIT_LIST_HEAD(&dev->tx_idle);
+
+	dev->cdev = cdev;
+	dev->function.name = "adb";
+	dev->function.descriptors = null_adb_descs;
+	dev->function.hs_descriptors = null_adb_descs;
+	dev->function.bind = adb_function_bind;
+	dev->function.unbind = adb_function_unbind;
+	dev->function.set_alt = adb_function_set_alt;
+	dev->function.disable = adb_function_disable;
+
+	/* _adb_dev must be set before calling usb_gadget_register_driver */
+	_adb_dev = dev;
+
+	ret = misc_register(&adb_device);
+	if (ret)
+		goto err1;
+	ret = usb_add_function(c, &dev->function);
+	if (ret)
+		goto err2;
+
+	return 0;
+
+err2:
+	misc_deregister(&adb_device);
+err1:
+	kfree(dev);
+	printk(KERN_ERR "adb gadget driver failed to initialize\n");
+	return ret;
+}
+
+void adb_function_enable(int enable)
+{
+	struct adb_dev *dev = _adb_dev;
+
+	if (dev) {
+		DBG(dev->cdev, "adb_function_enable(%s)\n",
+			enable ? "true" : "false");
+
+		if (enable) {
+			dev->function.descriptors = fs_adb_descs;
+			dev->function.hs_descriptors = hs_adb_descs;
+		} else {
+			dev->function.descriptors = null_adb_descs;
+			dev->function.hs_descriptors = null_adb_descs;
+		}
+	}
+}
+

drivers/usb/gadget/f_adb.h

@@ -0,0 +1,25 @@
+/*
+ * Gadget Driver for Android ADB
+ *
+ * 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.
+ *
+ */
+
+#ifndef __F_ADB_H
+#define __F_ADB_H
+
+int adb_function_add(struct usb_composite_dev *cdev,
+	struct usb_configuration *c);
+void adb_function_enable(int enable);
+
+#endif /* __F_ADB_H */

drivers/usb/gadget/f_mass_storage.h

@@ -0,0 +1,52 @@
+/*
+ * drivers/usb/gadget/f_mass_storage.h
+ *
+ * Function Driver for USB Mass Storage
+ *
+ * Copyright (C) 2008 Google, Inc.
+ * Author: Mike Lockwood <lockwood@android.com>
+ *
+ * Based heavily on the file_storage gadget driver in
+ * drivers/usb/gadget/file_storage.c and licensed under the same terms:
+ *
+ * Copyright (C) 2003-2007 Alan Stern
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __F_MASS_STORAGE_H
+#define __F_MASS_STORAGE_H
+
+int mass_storage_function_add(struct usb_composite_dev *cdev,
+	struct usb_configuration *c, int nluns);
+
+#endif /* __F_MASS_STORAGE_H */

include/linux/usb/android.h

@@ -0,0 +1,50 @@
+/*
+ * Platform data for Android USB
+ *
+ * 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.
+ *
+ */
+#ifndef	__LINUX_USB_ANDROID_H
+#define	__LINUX_USB_ANDROID_H
+
+struct android_usb_platform_data {
+	/* USB device descriptor fields */
+	__u16 vendor_id;
+
+	/* Default product ID. */
+	__u16 product_id;
+
+	/* Product ID when adb is enabled. */
+	__u16 adb_product_id;
+
+	__u16 version;
+
+	char *product_name;
+	char *manufacturer_name;
+	char *serial_number;
+
+	/* number of LUNS for mass storage function */
+	int nluns;
+};
+
+/* Platform data for "usb_mass_storage" driver.
+ * Contains values for the SC_INQUIRY SCSI command. */
+struct usb_mass_storage_platform_data {
+	char *vendor;
+	char *product;
+	int release;
+};
+
+extern void android_usb_set_connected(int on);
+
+#endif	/* __LINUX_USB_ANDROID_H */