drivers/usb/gadget/android.c - kernel/panda - Git at Google

 /*
  * 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);
	/*
	* 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);