+From 03e39e8f663c896dac11e87d96e8cb0292520e36 Mon Sep 17 00:00:00 2001
+From: Mike Lockwood <lockwood@android.com>
+Date: Tue, 2 Dec 2008 22:01:33 -0500
+Subject: [PATCH 101/134] android_usb: Composite USB gadget driver for android.
+
+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>
+---
+ drivers/usb/gadget/Kconfig | 8 +
+ drivers/usb/gadget/Makefile | 2 +
+ drivers/usb/gadget/android.c | 345 +++++
+ drivers/usb/gadget/f_adb.c | 668 ++++++++
+ drivers/usb/gadget/f_adb.h | 25 +
+ drivers/usb/gadget/f_mass_storage.c | 2906 +++++++++++++++++++++++++++++++++++
+ drivers/usb/gadget/f_mass_storage.h | 52 +
+ include/linux/usb/android.h | 40 +
+ 8 files changed, 4046 insertions(+), 0 deletions(-)
+ create mode 100644 drivers/usb/gadget/android.c
+ create mode 100644 drivers/usb/gadget/f_adb.c
+ create mode 100644 drivers/usb/gadget/f_adb.h
+ create mode 100644 drivers/usb/gadget/f_mass_storage.c
+ create mode 100644 drivers/usb/gadget/f_mass_storage.h
+ create mode 100644 include/linux/usb/android.h
+
+--- a/drivers/usb/gadget/Kconfig
++++ b/drivers/usb/gadget/Kconfig
+@@ -700,6 +700,14 @@ 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"
++ 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
+--- a/drivers/usb/gadget/Makefile
++++ b/drivers/usb/gadget/Makefile
+@@ -33,6 +33,7 @@ gadgetfs-objs := inode.o
+ g_file_storage-objs := file_storage.o
+ g_printer-objs := printer.o
+ g_cdc-objs := cdc2.o
++g_android-objs := android.o f_adb.o f_mass_storage.o
+
+ obj-$(CONFIG_USB_ZERO) += g_zero.o
+ obj-$(CONFIG_USB_ETH) += g_ether.o
+@@ -42,4 +43,5 @@ obj-$(CONFIG_USB_G_SERIAL) += g_serial.o
+ obj-$(CONFIG_USB_G_PRINTER) += g_printer.o
+ obj-$(CONFIG_USB_MIDI_GADGET) += g_midi.o
+ obj-$(CONFIG_USB_CDC_COMPOSITE) += g_cdc.o
++obj-$(CONFIG_USB_ANDROID) += g_android.o
+
+--- /dev/null
++++ b/drivers/usb/gadget/android.c
+@@ -0,0 +1,345 @@
++/*
++ * 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_gadget *gadget;
++ 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,
++};
++
++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 = 0x80, /* 250ma */
++};
++
++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;
++
++ if (gadget->ops->wakeup)
++ android_config_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
++
++ /* 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 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);
+--- /dev/null
++++ b/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/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;
++ }
++ }
++}
++
+--- /dev/null
++++ b/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 */
+--- /dev/null
++++ b/drivers/usb/gadget/f_mass_storage.c
+@@ -0,0 +1,2906 @@
++/*
++ * drivers/usb/gadget/f_mass_storage.c
++ *
++ * 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.
++ */
++
++/* #define DEBUG */
++/* #define VERBOSE_DEBUG */
++/* #define DUMP_MSGS */
++
++
++#include <linux/blkdev.h>
++#include <linux/completion.h>
++#include <linux/dcache.h>
++#include <linux/delay.h>
++#include <linux/device.h>
++#include <linux/fcntl.h>
++#include <linux/file.h>
++#include <linux/fs.h>
++#include <linux/kref.h>
++#include <linux/kthread.h>
++#include <linux/limits.h>
++#include <linux/rwsem.h>
++#include <linux/slab.h>
++#include <linux/spinlock.h>
++#include <linux/string.h>
++#include <linux/switch.h>
++#include <linux/freezer.h>
++#include <linux/utsname.h>
++#include <linux/wakelock.h>
++
++#include <linux/usb_usual.h>
++#include <linux/usb/ch9.h>
++#include <linux/usb/composite.h>
++#include <linux/usb/gadget.h>
++
++#include "f_mass_storage.h"
++#include "gadget_chips.h"
++
++
++#define BULK_BUFFER_SIZE 4096
++
++/*-------------------------------------------------------------------------*/
++
++#define DRIVER_NAME "usb_mass_storage"
++#define MAX_LUNS 8
++
++static const char shortname[] = DRIVER_NAME;
++
++#ifdef DEBUG
++#define LDBG(lun, fmt, args...) \
++ dev_dbg(&(lun)->dev , fmt , ## args)
++#define MDBG(fmt,args...) \
++ printk(KERN_DEBUG DRIVER_NAME ": " fmt , ## args)
++#else
++#define LDBG(lun, fmt, args...) \
++ do { } while (0)
++#define MDBG(fmt,args...) \
++ do { } while (0)
++#undef VERBOSE_DEBUG
++#undef DUMP_MSGS
++#endif /* DEBUG */
++
++#ifdef VERBOSE_DEBUG
++#define VLDBG LDBG
++#else
++#define VLDBG(lun, fmt, args...) \
++ do { } while (0)
++#endif /* VERBOSE_DEBUG */
++
++#define LERROR(lun, fmt, args...) \
++ dev_err(&(lun)->dev , fmt , ## args)
++#define LWARN(lun, fmt, args...) \
++ dev_warn(&(lun)->dev , fmt , ## args)
++#define LINFO(lun, fmt, args...) \
++ dev_info(&(lun)->dev , fmt , ## args)
++
++#define MINFO(fmt,args...) \
++ printk(KERN_INFO DRIVER_NAME ": " fmt , ## args)
++
++#undef DBG
++#undef VDBG
++#undef ERROR
++#undef WARNING
++#undef INFO
++#define DBG(d, fmt, args...) \
++ dev_dbg(&(d)->cdev->gadget->dev , fmt , ## args)
++#define VDBG(d, fmt, args...) \
++ dev_vdbg(&(d)->cdev->gadget->dev , fmt , ## args)
++#define ERROR(d, fmt, args...) \
++ dev_err(&(d)->cdev->gadget->dev , fmt , ## args)
++#define WARNING(d, fmt, args...) \
++ dev_warn(&(d)->cdev->gadget->dev , fmt , ## args)
++#define INFO(d, fmt, args...) \
++ dev_info(&(d)->cdev->gadget->dev , fmt , ## args)
++
++
++/*-------------------------------------------------------------------------*/
++
++/* Bulk-only data structures */
++
++/* Command Block Wrapper */
++struct bulk_cb_wrap {
++ __le32 Signature; /* Contains 'USBC' */
++ u32 Tag; /* Unique per command id */
++ __le32 DataTransferLength; /* Size of the data */
++ u8 Flags; /* Direction in bit 7 */
++ u8 Lun; /* LUN (normally 0) */
++ u8 Length; /* Of the CDB, <= MAX_COMMAND_SIZE */
++ u8 CDB[16]; /* Command Data Block */
++};
++
++#define USB_BULK_CB_WRAP_LEN 31
++#define USB_BULK_CB_SIG 0x43425355 /* Spells out USBC */
++#define USB_BULK_IN_FLAG 0x80
++
++/* Command Status Wrapper */
++struct bulk_cs_wrap {
++ __le32 Signature; /* Should = 'USBS' */
++ u32 Tag; /* Same as original command */
++ __le32 Residue; /* Amount not transferred */
++ u8 Status; /* See below */
++};
++
++#define USB_BULK_CS_WRAP_LEN 13
++#define USB_BULK_CS_SIG 0x53425355 /* Spells out 'USBS' */
++#define USB_STATUS_PASS 0
++#define USB_STATUS_FAIL 1
++#define USB_STATUS_PHASE_ERROR 2
++
++/* Bulk-only class specific requests */
++#define USB_BULK_RESET_REQUEST 0xff
++#define USB_BULK_GET_MAX_LUN_REQUEST 0xfe
++
++/* Length of a SCSI Command Data Block */
++#define MAX_COMMAND_SIZE 16
++
++/* SCSI commands that we recognize */
++#define SC_FORMAT_UNIT 0x04
++#define SC_INQUIRY 0x12
++#define SC_MODE_SELECT_6 0x15
++#define SC_MODE_SELECT_10 0x55
++#define SC_MODE_SENSE_6 0x1a
++#define SC_MODE_SENSE_10 0x5a
++#define SC_PREVENT_ALLOW_MEDIUM_REMOVAL 0x1e
++#define SC_READ_6 0x08
++#define SC_READ_10 0x28
++#define SC_READ_12 0xa8
++#define SC_READ_CAPACITY 0x25
++#define SC_READ_FORMAT_CAPACITIES 0x23
++#define SC_RELEASE 0x17
++#define SC_REQUEST_SENSE 0x03
++#define SC_RESERVE 0x16
++#define SC_SEND_DIAGNOSTIC 0x1d
++#define SC_START_STOP_UNIT 0x1b
++#define SC_SYNCHRONIZE_CACHE 0x35
++#define SC_TEST_UNIT_READY 0x00
++#define SC_VERIFY 0x2f
++#define SC_WRITE_6 0x0a
++#define SC_WRITE_10 0x2a
++#define SC_WRITE_12 0xaa
++
++/* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */
++#define SS_NO_SENSE 0
++#define SS_COMMUNICATION_FAILURE 0x040800
++#define SS_INVALID_COMMAND 0x052000
++#define SS_INVALID_FIELD_IN_CDB 0x052400
++#define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100
++#define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500
++#define SS_MEDIUM_NOT_PRESENT 0x023a00
++#define SS_MEDIUM_REMOVAL_PREVENTED 0x055302
++#define SS_NOT_READY_TO_READY_TRANSITION 0x062800
++#define SS_RESET_OCCURRED 0x062900
++#define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900
++#define SS_UNRECOVERED_READ_ERROR 0x031100
++#define SS_WRITE_ERROR 0x030c02
++#define SS_WRITE_PROTECTED 0x072700
++
++#define SK(x) ((u8) ((x) >> 16)) /* Sense Key byte, etc. */
++#define ASC(x) ((u8) ((x) >> 8))
++#define ASCQ(x) ((u8) (x))
++
++
++/*-------------------------------------------------------------------------*/
++
++struct lun {
++ struct file *filp;
++ loff_t file_length;
++ loff_t num_sectors;
++
++ unsigned int ro : 1;
++ unsigned int prevent_medium_removal : 1;
++ unsigned int registered : 1;
++ unsigned int info_valid : 1;
++
++ u32 sense_data;
++ u32 sense_data_info;
++ u32 unit_attention_data;
++
++ struct device dev;
++};
++
++#define backing_file_is_open(curlun) ((curlun)->filp != NULL)
++
++
++static struct lun *dev_to_lun(struct device *dev)
++{
++ return container_of(dev, struct lun, dev);
++}
++
++/* Big enough to hold our biggest descriptor */
++#define EP0_BUFSIZE 256
++#define DELAYED_STATUS (EP0_BUFSIZE + 999) /* An impossibly large value */
++
++/* Number of buffers we will use. 2 is enough for double-buffering */
++#define NUM_BUFFERS 2
++
++enum fsg_buffer_state {
++ BUF_STATE_EMPTY = 0,
++ BUF_STATE_FULL,
++ BUF_STATE_BUSY
++};
++
++struct fsg_buffhd {
++ void *buf;
++ enum fsg_buffer_state state;
++ struct fsg_buffhd *next;
++
++ /* The NetChip 2280 is faster, and handles some protocol faults
++ * better, if we don't submit any short bulk-out read requests.
++ * So we will record the intended request length here. */
++ unsigned int bulk_out_intended_length;
++
++ struct usb_request *inreq;
++ int inreq_busy;
++ struct usb_request *outreq;
++ int outreq_busy;
++};
++
++enum fsg_state {
++ /* This one isn't used anywhere */
++ FSG_STATE_COMMAND_PHASE = -10,
++
++ FSG_STATE_DATA_PHASE,
++ FSG_STATE_STATUS_PHASE,
++
++ FSG_STATE_IDLE = 0,
++ FSG_STATE_ABORT_BULK_OUT,
++ FSG_STATE_RESET,
++ FSG_STATE_CONFIG_CHANGE,
++ FSG_STATE_EXIT,
++ FSG_STATE_TERMINATED
++};
++
++enum data_direction {
++ DATA_DIR_UNKNOWN = 0,
++ DATA_DIR_FROM_HOST,
++ DATA_DIR_TO_HOST,
++ DATA_DIR_NONE
++};
++
++struct fsg_dev {
++ struct usb_function function;
++ struct usb_composite_dev *cdev;
++
++ /* lock protects: state and all the req_busy's */
++ spinlock_t lock;
++
++ /* filesem protects: backing files in use */
++ struct rw_semaphore filesem;
++
++ /* reference counting: wait until all LUNs are released */
++ struct kref ref;
++
++ unsigned int bulk_out_maxpacket;
++ enum fsg_state state; /* For exception handling */
++
++ u8 config, new_config;
++
++ unsigned int running : 1;
++ unsigned int bulk_in_enabled : 1;
++ unsigned int bulk_out_enabled : 1;
++ unsigned int phase_error : 1;
++ unsigned int short_packet_received : 1;
++ unsigned int bad_lun_okay : 1;
++
++ unsigned long atomic_bitflags;
++#define REGISTERED 0
++#define CLEAR_BULK_HALTS 1
++#define SUSPENDED 2
++
++ struct usb_ep *bulk_in;
++ struct usb_ep *bulk_out;
++
++ struct fsg_buffhd *next_buffhd_to_fill;
++ struct fsg_buffhd *next_buffhd_to_drain;
++ struct fsg_buffhd buffhds[NUM_BUFFERS];
++
++ int thread_wakeup_needed;
++ struct completion thread_notifier;
++ struct task_struct *thread_task;
++
++ int cmnd_size;
++ u8 cmnd[MAX_COMMAND_SIZE];
++ enum data_direction data_dir;
++ u32 data_size;
++ u32 data_size_from_cmnd;
++ u32 tag;
++ unsigned int lun;
++ u32 residue;
++ u32 usb_amount_left;
++
++ unsigned int nluns;
++ struct lun *luns;
++ struct lun *curlun;
++
++ u32 buf_size;
++ const char *vendor;
++ const char *product;
++ int release;
++
++ struct switch_dev sdev;
++
++ struct wake_lock wake_lock;
++};
++
++static inline struct fsg_dev *func_to_dev(struct usb_function *f)
++{
++ return container_of(f, struct fsg_dev, function);
++}
++
++static int exception_in_progress(struct fsg_dev *fsg)
++{
++ return (fsg->state > FSG_STATE_IDLE);
++}
++
++/* Make bulk-out requests be divisible by the maxpacket size */
++static void set_bulk_out_req_length(struct fsg_dev *fsg,
++ struct fsg_buffhd *bh, unsigned int length)
++{
++ unsigned int rem;
++
++ bh->bulk_out_intended_length = length;
++ rem = length % fsg->bulk_out_maxpacket;
++ if (rem > 0)
++ length += fsg->bulk_out_maxpacket - rem;
++ bh->outreq->length = length;
++}
++
++static struct fsg_dev *the_fsg;
++
++static void close_backing_file(struct fsg_dev *fsg, struct lun *curlun);
++static void close_all_backing_files(struct fsg_dev *fsg);
++
++
++/*-------------------------------------------------------------------------*/
++
++#ifdef DUMP_MSGS
++
++static void dump_msg(struct fsg_dev *fsg, const char *label,
++ const u8 *buf, unsigned int length)
++{
++ if (length < 512) {
++ DBG(fsg, "%s, length %u:\n", label, length);
++ print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET,
++ 16, 1, buf, length, 0);
++ }
++}
++
++static void dump_cdb(struct fsg_dev *fsg)
++{}
++
++#else
++
++static void dump_msg(struct fsg_dev *fsg, const char *label,
++ const u8 *buf, unsigned int length)
++{}
++
++#ifdef VERBOSE_DEBUG
++
++static void dump_cdb(struct fsg_dev *fsg)
++{
++ print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE,
++ 16, 1, fsg->cmnd, fsg->cmnd_size, 0);
++}
++
++#else
++
++static void dump_cdb(struct fsg_dev *fsg)
++{}
++
++#endif /* VERBOSE_DEBUG */
++#endif /* DUMP_MSGS */
++
++
++/*-------------------------------------------------------------------------*/
++
++/* Routines for unaligned data access */
++
++static u16 get_be16(u8 *buf)
++{
++ return ((u16) buf[0] << 8) | ((u16) buf[1]);
++}
++
++static u32 get_be32(u8 *buf)
++{
++ return ((u32) buf[0] << 24) | ((u32) buf[1] << 16) |
++ ((u32) buf[2] << 8) | ((u32) buf[3]);
++}
++
++static void put_be16(u8 *buf, u16 val)
++{
++ buf[0] = val >> 8;
++ buf[1] = val;
++}
++
++static void put_be32(u8 *buf, u32 val)
++{
++ buf[0] = val >> 24;
++ buf[1] = val >> 16;
++ buf[2] = val >> 8;
++ buf[3] = val & 0xff;
++}
++
++/*-------------------------------------------------------------------------*/
++
++/*
++ * DESCRIPTORS ... most are static, but strings and (full) configuration
++ * descriptors are built on demand. Also the (static) config and interface
++ * descriptors are adjusted during fsg_bind().
++ */
++
++/* There is only one interface. */
++
++static struct usb_interface_descriptor
++intf_desc = {
++ .bLength = sizeof intf_desc,
++ .bDescriptorType = USB_DT_INTERFACE,
++
++ .bNumEndpoints = 2, /* Adjusted during fsg_bind() */
++ .bInterfaceClass = USB_CLASS_MASS_STORAGE,
++ .bInterfaceSubClass = US_SC_SCSI,
++ .bInterfaceProtocol = US_PR_BULK,
++};
++
++/* Three full-speed endpoint descriptors: bulk-in, bulk-out,
++ * and interrupt-in. */
++
++static struct usb_endpoint_descriptor
++fs_bulk_in_desc = {
++ .bLength = USB_DT_ENDPOINT_SIZE,
++ .bDescriptorType = USB_DT_ENDPOINT,
++
++ .bEndpointAddress = USB_DIR_IN,
++ .bmAttributes = USB_ENDPOINT_XFER_BULK,
++ /* wMaxPacketSize set by autoconfiguration */
++};
++
++static struct usb_endpoint_descriptor
++fs_bulk_out_desc = {
++ .bLength = USB_DT_ENDPOINT_SIZE,
++ .bDescriptorType = USB_DT_ENDPOINT,
++
++ .bEndpointAddress = USB_DIR_OUT,
++ .bmAttributes = USB_ENDPOINT_XFER_BULK,
++ /* wMaxPacketSize set by autoconfiguration */
++};
++
++static struct usb_descriptor_header *fs_function[] = {
++ (struct usb_descriptor_header *) &intf_desc,
++ (struct usb_descriptor_header *) &fs_bulk_in_desc,
++ (struct usb_descriptor_header *) &fs_bulk_out_desc,
++ NULL,
++};
++#define FS_FUNCTION_PRE_EP_ENTRIES 2
++
++
++static struct usb_endpoint_descriptor
++hs_bulk_in_desc = {
++ .bLength = USB_DT_ENDPOINT_SIZE,
++ .bDescriptorType = USB_DT_ENDPOINT,
++
++ /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
++ .bmAttributes = USB_ENDPOINT_XFER_BULK,
++ .wMaxPacketSize = __constant_cpu_to_le16(512),
++};
++
++static struct usb_endpoint_descriptor
++hs_bulk_out_desc = {
++ .bLength = USB_DT_ENDPOINT_SIZE,
++ .bDescriptorType = USB_DT_ENDPOINT,
++
++ /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
++ .bmAttributes = USB_ENDPOINT_XFER_BULK,
++ .wMaxPacketSize = __constant_cpu_to_le16(512),
++ .bInterval = 1, /* NAK every 1 uframe */
++};
++
++
++static struct usb_descriptor_header *hs_function[] = {
++ (struct usb_descriptor_header *) &intf_desc,
++ (struct usb_descriptor_header *) &hs_bulk_in_desc,
++ (struct usb_descriptor_header *) &hs_bulk_out_desc,
++ NULL,
++};
++
++/* Maxpacket and other transfer characteristics vary by speed. */
++static struct usb_endpoint_descriptor *
++ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs,
++ struct usb_endpoint_descriptor *hs)
++{
++ if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
++ return hs;
++ return fs;
++}
++
++/*-------------------------------------------------------------------------*/
++
++/* These routines may be called in process context or in_irq */
++
++/* Caller must hold fsg->lock */
++static void wakeup_thread(struct fsg_dev *fsg)
++{
++ /* Tell the main thread that something has happened */
++ fsg->thread_wakeup_needed = 1;
++ if (fsg->thread_task)
++ wake_up_process(fsg->thread_task);
++}
++
++
++static void raise_exception(struct fsg_dev *fsg, enum fsg_state new_state)
++{
++ unsigned long flags;
++
++ DBG(fsg, "raise_exception %d\n", (int)new_state);
++ /* Do nothing if a higher-priority exception is already in progress.
++ * If a lower-or-equal priority exception is in progress, preempt it
++ * and notify the main thread by sending it a signal. */
++ spin_lock_irqsave(&fsg->lock, flags);
++ if (fsg->state <= new_state) {
++ fsg->state = new_state;
++ if (fsg->thread_task)
++ send_sig_info(SIGUSR1, SEND_SIG_FORCED,
++ fsg->thread_task);
++ }
++ spin_unlock_irqrestore(&fsg->lock, flags);
++}
++
++
++/*-------------------------------------------------------------------------*/
++
++/* Bulk and interrupt endpoint completion handlers.
++ * These always run in_irq. */
++
++static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req)
++{
++ struct fsg_dev *fsg = ep->driver_data;
++ struct fsg_buffhd *bh = req->context;
++
++ if (req->status || req->actual != req->length)
++ DBG(fsg, "%s --> %d, %u/%u\n", __func__,
++ req->status, req->actual, req->length);
++
++ /* Hold the lock while we update the request and buffer states */
++ smp_wmb();
++ spin_lock(&fsg->lock);
++ bh->inreq_busy = 0;
++ bh->state = BUF_STATE_EMPTY;
++ wakeup_thread(fsg);
++ spin_unlock(&fsg->lock);
++}
++
++static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req)
++{
++ struct fsg_dev *fsg = ep->driver_data;
++ struct fsg_buffhd *bh = req->context;
++
++ dump_msg(fsg, "bulk-out", req->buf, req->actual);
++ if (req->status || req->actual != bh->bulk_out_intended_length)
++ DBG(fsg, "%s --> %d, %u/%u\n", __func__,
++ req->status, req->actual,
++ bh->bulk_out_intended_length);
++
++ /* Hold the lock while we update the request and buffer states */
++ smp_wmb();
++ spin_lock(&fsg->lock);
++ bh->outreq_busy = 0;
++ bh->state = BUF_STATE_FULL;
++ wakeup_thread(fsg);
++ spin_unlock(&fsg->lock);
++}
++
++static int fsg_function_setup(struct usb_function *f,
++ const struct usb_ctrlrequest *ctrl)
++{
++ struct fsg_dev *fsg = func_to_dev(f);
++ struct usb_composite_dev *cdev = fsg->cdev;
++ int value = -EOPNOTSUPP;
++ u16 w_index = le16_to_cpu(ctrl->wIndex);
++ u16 w_value = le16_to_cpu(ctrl->wValue);
++ u16 w_length = le16_to_cpu(ctrl->wLength);
++
++ DBG(fsg, "fsg_function_setup\n");
++ /* Handle Bulk-only class-specific requests */
++ if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) {
++ DBG(fsg, "USB_TYPE_CLASS\n");
++ switch (ctrl->bRequest) {
++ case USB_BULK_RESET_REQUEST:
++ if (ctrl->bRequestType != (USB_DIR_OUT |
++ USB_TYPE_CLASS | USB_RECIP_INTERFACE))
++ break;
++ if (w_index != 0 || w_value != 0) {
++ value = -EDOM;
++ break;
++ }
++
++ /* Raise an exception to stop the current operation
++ * and reinitialize our state. */
++ DBG(fsg, "bulk reset request\n");
++ raise_exception(fsg, FSG_STATE_RESET);
++ value = DELAYED_STATUS;
++ break;
++
++ case USB_BULK_GET_MAX_LUN_REQUEST:
++ if (ctrl->bRequestType != (USB_DIR_IN |
++ USB_TYPE_CLASS | USB_RECIP_INTERFACE))
++ break;
++ if (w_index != 0 || w_value != 0) {
++ value = -EDOM;
++ break;
++ }
++ VDBG(fsg, "get max LUN\n");
++ *(u8 *)cdev->req->buf = fsg->nluns - 1;
++ value = 1;
++ break;
++ }
++ }
++
++ if (value == -EOPNOTSUPP)
++ VDBG(fsg,
++ "unknown class-specific control req "
++ "%02x.%02x v%04x i%04x l%u\n",
++ ctrl->bRequestType, ctrl->bRequest,
++ le16_to_cpu(ctrl->wValue), w_index, w_length);
++ return value;
++}
++
++/*-------------------------------------------------------------------------*/
++
++/* All the following routines run in process context */
++
++
++/* Use this for bulk or interrupt transfers, not ep0 */
++static void start_transfer(struct fsg_dev *fsg, struct usb_ep *ep,
++ struct usb_request *req, int *pbusy,
++ enum fsg_buffer_state *state)
++{
++ int rc;
++
++ DBG(fsg, "start_transfer req: %p, req->buf: %p\n", req, req->buf);
++ if (ep == fsg->bulk_in)
++ dump_msg(fsg, "bulk-in", req->buf, req->length);
++
++ spin_lock_irq(&fsg->lock);
++ *pbusy = 1;
++ *state = BUF_STATE_BUSY;
++ spin_unlock_irq(&fsg->lock);
++ rc = usb_ep_queue(ep, req, GFP_KERNEL);
++ if (rc != 0) {
++ *pbusy = 0;
++ *state = BUF_STATE_EMPTY;
++
++ /* We can't do much more than wait for a reset */
++
++ /* Note: currently the net2280 driver fails zero-length
++ * submissions if DMA is enabled. */
++ if (rc != -ESHUTDOWN && !(rc == -EOPNOTSUPP &&
++ req->length == 0))
++ WARN(fsg, "error in submission: %s --> %d\n",
++ (ep == fsg->bulk_in ? "bulk-in" : "bulk-out"),
++ rc);
++ }
++}
++
++
++static int sleep_thread(struct fsg_dev *fsg)
++{
++ int rc = 0;
++
++ /* Wait until a signal arrives or we are woken up */
++ for (;;) {
++ try_to_freeze();
++ set_current_state(TASK_INTERRUPTIBLE);
++ if (signal_pending(current)) {
++ rc = -EINTR;
++ break;
++ }
++ if (fsg->thread_wakeup_needed)
++ break;
++ schedule();
++ }
++ __set_current_state(TASK_RUNNING);
++ fsg->thread_wakeup_needed = 0;
++ return rc;
++}
++
++
++/*-------------------------------------------------------------------------*/
++
++static int do_read(struct fsg_dev *fsg)
++{
++ struct lun *curlun = fsg->curlun;
++ u32 lba;
++ struct fsg_buffhd *bh;
++ int rc;
++ u32 amount_left;
++ loff_t file_offset, file_offset_tmp;
++ unsigned int amount;
++ unsigned int partial_page;
++ ssize_t nread;
++
++ /* Get the starting Logical Block Address and check that it's
++ * not too big */
++ if (fsg->cmnd[0] == SC_READ_6)
++ lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
++ else {
++ lba = get_be32(&fsg->cmnd[2]);
++
++ /* We allow DPO (Disable Page Out = don't save data in the
++ * cache) and FUA (Force Unit Access = don't read from the
++ * cache), but we don't implement them. */
++ if ((fsg->cmnd[1] & ~0x18) != 0) {
++ curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
++ return -EINVAL;
++ }
++ }
++ if (lba >= curlun->num_sectors) {
++ curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
++ return -EINVAL;
++ }
++ file_offset = ((loff_t) lba) << 9;
++
++ /* Carry out the file reads */
++ amount_left = fsg->data_size_from_cmnd;
++ if (unlikely(amount_left == 0))
++ return -EIO; /* No default reply */
++
++ for (;;) {
++
++ /* Figure out how much we need to read:
++ * Try to read the remaining amount.
++ * But don't read more than the buffer size.
++ * And don't try to read past the end of the file.
++ * Finally, if we're not at a page boundary, don't read past
++ * the next page.
++ * If this means reading 0 then we were asked to read past
++ * the end of file. */
++ amount = min((unsigned int) amount_left,
++ (unsigned int)fsg->buf_size);
++ amount = min((loff_t) amount,
++ curlun->file_length - file_offset);
++ partial_page = file_offset & (PAGE_CACHE_SIZE - 1);
++ if (partial_page > 0)
++ amount = min(amount, (unsigned int) PAGE_CACHE_SIZE -
++ partial_page);
++
++ /* Wait for the next buffer to become available */
++ bh = fsg->next_buffhd_to_fill;
++ while (bh->state != BUF_STATE_EMPTY) {
++ rc = sleep_thread(fsg);
++ if (rc)
++ return rc;
++ }
++
++ /* If we were asked to read past the end of file,
++ * end with an empty buffer. */
++ if (amount == 0) {
++ curlun->sense_data =
++ SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
++ curlun->sense_data_info = file_offset >> 9;
++ curlun->info_valid = 1;
++ bh->inreq->length = 0;
++ bh->state = BUF_STATE_FULL;
++ break;
++ }
++
++ /* Perform the read */
++ file_offset_tmp = file_offset;
++ nread = vfs_read(curlun->filp,
++ (char __user *) bh->buf,
++ amount, &file_offset_tmp);
++ VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
++ (unsigned long long) file_offset,
++ (int) nread);
++ if (signal_pending(current))
++ return -EINTR;
++
++ if (nread < 0) {
++ LDBG(curlun, "error in file read: %d\n",
++ (int) nread);
++ nread = 0;
++ } else if (nread < amount) {
++ LDBG(curlun, "partial file read: %d/%u\n",
++ (int) nread, amount);
++ nread -= (nread & 511); /* Round down to a block */
++ }
++ file_offset += nread;
++ amount_left -= nread;
++ fsg->residue -= nread;
++ bh->inreq->length = nread;
++ bh->state = BUF_STATE_FULL;
++
++ /* If an error occurred, report it and its position */
++ if (nread < amount) {
++ curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
++ curlun->sense_data_info = file_offset >> 9;
++ curlun->info_valid = 1;
++ break;
++ }
++
++ if (amount_left == 0)
++ break; /* No more left to read */
++
++ /* Send this buffer and go read some more */
++ start_transfer(fsg, fsg->bulk_in, bh->inreq,
++ &bh->inreq_busy, &bh->state);
++ fsg->next_buffhd_to_fill = bh->next;
++ }
++
++ return -EIO; /* No default reply */
++}
++
++
++/*-------------------------------------------------------------------------*/
++
++static int do_write(struct fsg_dev *fsg)
++{
++ struct lun *curlun = fsg->curlun;
++ u32 lba;
++ struct fsg_buffhd *bh;
++ int get_some_more;
++ u32 amount_left_to_req, amount_left_to_write;
++ loff_t usb_offset, file_offset, file_offset_tmp;
++ unsigned int amount;
++ unsigned int partial_page;
++ ssize_t nwritten;
++ int rc;
++
++ if (curlun->ro) {
++ curlun->sense_data = SS_WRITE_PROTECTED;
++ return -EINVAL;
++ }
++ curlun->filp->f_flags &= ~O_SYNC; /* Default is not to wait */
++
++ /* Get the starting Logical Block Address and check that it's
++ * not too big */
++ if (fsg->cmnd[0] == SC_WRITE_6)
++ lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
++ else {
++ lba = get_be32(&fsg->cmnd[2]);
++
++ /* We allow DPO (Disable Page Out = don't save data in the
++ * cache) and FUA (Force Unit Access = write directly to the
++ * medium). We don't implement DPO; we implement FUA by
++ * performing synchronous output. */
++ if ((fsg->cmnd[1] & ~0x18) != 0) {
++ curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
++ return -EINVAL;
++ }
++ if (fsg->cmnd[1] & 0x08) /* FUA */
++ curlun->filp->f_flags |= O_SYNC;
++ }
++ if (lba >= curlun->num_sectors) {
++ curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
++ return -EINVAL;
++ }
++
++ /* Carry out the file writes */
++ get_some_more = 1;
++ file_offset = usb_offset = ((loff_t) lba) << 9;
++ amount_left_to_req = amount_left_to_write = fsg->data_size_from_cmnd;
++
++ while (amount_left_to_write > 0) {
++
++ /* Queue a request for more data from the host */
++ bh = fsg->next_buffhd_to_fill;
++ if (bh->state == BUF_STATE_EMPTY && get_some_more) {
++
++ /* Figure out how much we want to get:
++ * Try to get the remaining amount.
++ * But don't get more than the buffer size.
++ * And don't try to go past the end of the file.
++ * If we're not at a page boundary,
++ * don't go past the next page.
++ * If this means getting 0, then we were asked
++ * to write past the end of file.
++ * Finally, round down to a block boundary. */
++ amount = min(amount_left_to_req, (u32)fsg->buf_size);
++ amount = min((loff_t) amount, curlun->file_length -
++ usb_offset);
++ partial_page = usb_offset & (PAGE_CACHE_SIZE - 1);
++ if (partial_page > 0)
++ amount = min(amount,
++ (unsigned int) PAGE_CACHE_SIZE - partial_page);
++
++ if (amount == 0) {
++ get_some_more = 0;
++ curlun->sense_data =
++ SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
++ curlun->sense_data_info = usb_offset >> 9;
++ curlun->info_valid = 1;
++ continue;
++ }
++ amount -= (amount & 511);
++ if (amount == 0) {
++
++ /* Why were we were asked to transfer a
++ * partial block? */
++ get_some_more = 0;
++ continue;
++ }
++
++ /* Get the next buffer */
++ usb_offset += amount;
++ fsg->usb_amount_left -= amount;
++ amount_left_to_req -= amount;
++ if (amount_left_to_req == 0)
++ get_some_more = 0;
++
++ /* amount is always divisible by 512, hence by
++ * the bulk-out maxpacket size */
++ bh->outreq->length = bh->bulk_out_intended_length =
++ amount;
++ start_transfer(fsg, fsg->bulk_out, bh->outreq,
++ &bh->outreq_busy, &bh->state);
++ fsg->next_buffhd_to_fill = bh->next;
++ continue;
++ }
++
++ /* Write the received data to the backing file */
++ bh = fsg->next_buffhd_to_drain;
++ if (bh->state == BUF_STATE_EMPTY && !get_some_more)
++ break; /* We stopped early */
++ if (bh->state == BUF_STATE_FULL) {
++ smp_rmb();
++ fsg->next_buffhd_to_drain = bh->next;
++ bh->state = BUF_STATE_EMPTY;
++
++ /* Did something go wrong with the transfer? */
++ if (bh->outreq->status != 0) {
++ curlun->sense_data = SS_COMMUNICATION_FAILURE;
++ curlun->sense_data_info = file_offset >> 9;
++ curlun->info_valid = 1;
++ break;
++ }
++
++ amount = bh->outreq->actual;
++ if (curlun->file_length - file_offset < amount) {
++ LERROR(curlun,
++ "write %u @ %llu beyond end %llu\n",
++ amount, (unsigned long long) file_offset,
++ (unsigned long long) curlun->file_length);
++ amount = curlun->file_length - file_offset;
++ }
++
++ /* Perform the write */
++ file_offset_tmp = file_offset;
++ nwritten = vfs_write(curlun->filp,
++ (char __user *) bh->buf,
++ amount, &file_offset_tmp);
++ VLDBG(curlun, "file write %u @ %llu -> %d\n", amount,
++ (unsigned long long) file_offset,
++ (int) nwritten);
++ if (signal_pending(current))
++ return -EINTR; /* Interrupted! */
++
++ if (nwritten < 0) {
++ LDBG(curlun, "error in file write: %d\n",
++ (int) nwritten);
++ nwritten = 0;
++ } else if (nwritten < amount) {
++ LDBG(curlun, "partial file write: %d/%u\n",
++ (int) nwritten, amount);
++ nwritten -= (nwritten & 511);
++ /* Round down to a block */
++ }
++ file_offset += nwritten;
++ amount_left_to_write -= nwritten;
++ fsg->residue -= nwritten;
++
++ /* If an error occurred, report it and its position */
++ if (nwritten < amount) {
++ curlun->sense_data = SS_WRITE_ERROR;
++ curlun->sense_data_info = file_offset >> 9;
++ curlun->info_valid = 1;
++ break;
++ }
++
++ /* Did the host decide to stop early? */
++ if (bh->outreq->actual != bh->outreq->length) {
++ fsg->short_packet_received = 1;
++ break;
++ }
++ continue;
++ }
++
++ /* Wait for something to happen */
++ rc = sleep_thread(fsg);
++ if (rc)
++ return rc;
++ }
++
++ return -EIO; /* No default reply */
++}
++
++
++/*-------------------------------------------------------------------------*/
++
++/* Sync the file data, don't bother with the metadata.
++ * The caller must own fsg->filesem.
++ * This code was copied from fs/buffer.c:sys_fdatasync(). */
++static int fsync_sub(struct lun *curlun)
++{
++ struct file *filp = curlun->filp;
++ struct inode *inode;
++ int rc, err;
++
++ if (curlun->ro || !filp)
++ return 0;
++ if (!filp->f_op->fsync)
++ return -EINVAL;
++
++ inode = filp->f_path.dentry->d_inode;
++ mutex_lock(&inode->i_mutex);
++ rc = filemap_fdatawrite(inode->i_mapping);
++ err = filp->f_op->fsync(filp, filp->f_path.dentry, 1);
++ if (!rc)
++ rc = err;
++ err = filemap_fdatawait(inode->i_mapping);
++ if (!rc)
++ rc = err;
++ mutex_unlock(&inode->i_mutex);
++ VLDBG(curlun, "fdatasync -> %d\n", rc);
++ return rc;
++}
++
++static void fsync_all(struct fsg_dev *fsg)
++{
++ int i;
++
++ for (i = 0; i < fsg->nluns; ++i)
++ fsync_sub(&fsg->luns[i]);
++}
++
++static int do_synchronize_cache(struct fsg_dev *fsg)
++{
++ struct lun *curlun = fsg->curlun;
++ int rc;
++
++ /* We ignore the requested LBA and write out all file's
++ * dirty data buffers. */
++ rc = fsync_sub(curlun);
++ if (rc)
++ curlun->sense_data = SS_WRITE_ERROR;
++ return 0;
++}
++
++
++/*-------------------------------------------------------------------------*/
++
++static void invalidate_sub(struct lun *curlun)
++{
++ struct file *filp = curlun->filp;
++ struct inode *inode = filp->f_path.dentry->d_inode;
++ unsigned long rc;
++
++ rc = invalidate_mapping_pages(inode->i_mapping, 0, -1);
++ VLDBG(curlun, "invalidate_inode_pages -> %ld\n", rc);
++}
++
++static int do_verify(struct fsg_dev *fsg)
++{
++ struct lun *curlun = fsg->curlun;
++ u32 lba;
++ u32 verification_length;
++ struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
++ loff_t file_offset, file_offset_tmp;
++ u32 amount_left;
++ unsigned int amount;
++ ssize_t nread;
++
++ /* Get the starting Logical Block Address and check that it's
++ * not too big */
++ lba = get_be32(&fsg->cmnd[2]);
++ if (lba >= curlun->num_sectors) {
++ curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
++ return -EINVAL;
++ }
++
++ /* We allow DPO (Disable Page Out = don't save data in the
++ * cache) but we don't implement it. */
++ if ((fsg->cmnd[1] & ~0x10) != 0) {
++ curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
++ return -EINVAL;
++ }
++
++ verification_length = get_be16(&fsg->cmnd[7]);
++ if (unlikely(verification_length == 0))
++ return -EIO; /* No default reply */
++
++ /* Prepare to carry out the file verify */
++ amount_left = verification_length << 9;
++ file_offset = ((loff_t) lba) << 9;
++
++ /* Write out all the dirty buffers before invalidating them */
++ fsync_sub(curlun);
++ if (signal_pending(current))
++ return -EINTR;
++
++ invalidate_sub(curlun);
++ if (signal_pending(current))
++ return -EINTR;
++
++ /* Just try to read the requested blocks */
++ while (amount_left > 0) {
++
++ /* Figure out how much we need to read:
++ * Try to read the remaining amount, but not more than
++ * the buffer size.
++ * And don't try to read past the end of the file.
++ * If this means reading 0 then we were asked to read
++ * past the end of file. */
++ amount = min((unsigned int) amount_left,
++ (unsigned int)fsg->buf_size);
++ amount = min((loff_t) amount,
++ curlun->file_length - file_offset);
++ if (amount == 0) {
++ curlun->sense_data =
++ SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
++ curlun->sense_data_info = file_offset >> 9;
++ curlun->info_valid = 1;
++ break;
++ }
++
++ /* Perform the read */
++ file_offset_tmp = file_offset;
++ nread = vfs_read(curlun->filp,
++ (char __user *) bh->buf,
++ amount, &file_offset_tmp);
++ VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
++ (unsigned long long) file_offset,
++ (int) nread);
++ if (signal_pending(current))
++ return -EINTR;
++
++ if (nread < 0) {
++ LDBG(curlun, "error in file verify: %d\n",
++ (int) nread);
++ nread = 0;
++ } else if (nread < amount) {
++ LDBG(curlun, "partial file verify: %d/%u\n",
++ (int) nread, amount);
++ nread -= (nread & 511); /* Round down to a sector */
++ }
++ if (nread == 0) {
++ curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
++ curlun->sense_data_info = file_offset >> 9;
++ curlun->info_valid = 1;
++ break;
++ }
++ file_offset += nread;
++ amount_left -= nread;
++ }
++ return 0;
++}
++
++
++/*-------------------------------------------------------------------------*/
++
++static int do_inquiry(struct fsg_dev *fsg, struct fsg_buffhd *bh)
++{
++ u8 *buf = (u8 *) bh->buf;
++
++ if (!fsg->curlun) { /* Unsupported LUNs are okay */
++ fsg->bad_lun_okay = 1;
++ memset(buf, 0, 36);
++ buf[0] = 0x7f; /* Unsupported, no device-type */
++ return 36;
++ }
++
++ memset(buf, 0, 8); /* Non-removable, direct-access device */
++
++ buf[1] = 0x80; /* set removable bit */
++ buf[2] = 2; /* ANSI SCSI level 2 */
++ buf[3] = 2; /* SCSI-2 INQUIRY data format */
++ buf[4] = 31; /* Additional length */
++ /* No special options */
++ sprintf(buf + 8, "%-8s%-16s%04x", fsg->vendor,
++ fsg->product, fsg->release);
++ return 36;
++}
++
++
++static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
++{
++ struct lun *curlun = fsg->curlun;
++ u8 *buf = (u8 *) bh->buf;
++ u32 sd, sdinfo;
++ int valid;
++
++ /*
++ * From the SCSI-2 spec., section 7.9 (Unit attention condition):
++ *
++ * If a REQUEST SENSE command is received from an initiator
++ * with a pending unit attention condition (before the target
++ * generates the contingent allegiance condition), then the
++ * target shall either:
++ * a) report any pending sense data and preserve the unit
++ * attention condition on the logical unit, or,
++ * b) report the unit attention condition, may discard any
++ * pending sense data, and clear the unit attention
++ * condition on the logical unit for that initiator.
++ *
++ * FSG normally uses option a); enable this code to use option b).
++ */
++#if 0
++ if (curlun && curlun->unit_attention_data != SS_NO_SENSE) {
++ curlun->sense_data = curlun->unit_attention_data;
++ curlun->unit_attention_data = SS_NO_SENSE;
++ }
++#endif
++
++ if (!curlun) { /* Unsupported LUNs are okay */
++ fsg->bad_lun_okay = 1;
++ sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
++ sdinfo = 0;
++ valid = 0;
++ } else {
++ sd = curlun->sense_data;
++ sdinfo = curlun->sense_data_info;
++ valid = curlun->info_valid << 7;
++ curlun->sense_data = SS_NO_SENSE;
++ curlun->sense_data_info = 0;
++ curlun->info_valid = 0;
++ }
++
++ memset(buf, 0, 18);
++ buf[0] = valid | 0x70; /* Valid, current error */
++ buf[2] = SK(sd);
++ put_be32(&buf[3], sdinfo); /* Sense information */
++ buf[7] = 18 - 8; /* Additional sense length */
++ buf[12] = ASC(sd);
++ buf[13] = ASCQ(sd);
++ return 18;
++}
++
++
++static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh)
++{
++ struct lun *curlun = fsg->curlun;
++ u32 lba = get_be32(&fsg->cmnd[2]);
++ int pmi = fsg->cmnd[8];
++ u8 *buf = (u8 *) bh->buf;
++
++ /* Check the PMI and LBA fields */
++ if (pmi > 1 || (pmi == 0 && lba != 0)) {
++ curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
++ return -EINVAL;
++ }
++
++ put_be32(&buf[0], curlun->num_sectors - 1); /* Max logical block */
++ put_be32(&buf[4], 512); /* Block length */
++ return 8;
++}
++
++
++static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
++{
++ struct lun *curlun = fsg->curlun;
++ int mscmnd = fsg->cmnd[0];
++ u8 *buf = (u8 *) bh->buf;
++ u8 *buf0 = buf;
++ int pc, page_code;
++ int changeable_values, all_pages;
++ int valid_page = 0;
++ int len, limit;
++
++ if ((fsg->cmnd[1] & ~0x08) != 0) { /* Mask away DBD */
++ curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
++ return -EINVAL;
++ }
++ pc = fsg->cmnd[2] >> 6;
++ page_code = fsg->cmnd[2] & 0x3f;
++ if (pc == 3) {
++ curlun->sense_data = SS_SAVING_PARAMETERS_NOT_SUPPORTED;
++ return -EINVAL;
++ }
++ changeable_values = (pc == 1);
++ all_pages = (page_code == 0x3f);
++
++ /* Write the mode parameter header. Fixed values are: default
++ * medium type, no cache control (DPOFUA), and no block descriptors.
++ * The only variable value is the WriteProtect bit. We will fill in
++ * the mode data length later. */
++ memset(buf, 0, 8);
++ if (mscmnd == SC_MODE_SENSE_6) {
++ buf[2] = (curlun->ro ? 0x80 : 0x00); /* WP, DPOFUA */
++ buf += 4;
++ limit = 255;
++ } else { /* SC_MODE_SENSE_10 */
++ buf[3] = (curlun->ro ? 0x80 : 0x00); /* WP, DPOFUA */
++ buf += 8;
++ limit = 65535;
++ }
++
++ /* No block descriptors */
++
++ /* Disabled to workaround USB reset problems with a Vista host.
++ */
++#if 0
++ /* The mode pages, in numerical order. The only page we support
++ * is the Caching page. */
++ if (page_code == 0x08 || all_pages) {
++ valid_page = 1;
++ buf[0] = 0x08; /* Page code */
++ buf[1] = 10; /* Page length */
++ memset(buf+2, 0, 10); /* None of the fields are changeable */
++
++ if (!changeable_values) {
++ buf[2] = 0x04; /* Write cache enable, */
++ /* Read cache not disabled */
++ /* No cache retention priorities */
++ put_be16(&buf[4], 0xffff); /* Don't disable prefetch */
++ /* Minimum prefetch = 0 */
++ put_be16(&buf[8], 0xffff); /* Maximum prefetch */
++ /* Maximum prefetch ceiling */
++ put_be16(&buf[10], 0xffff);
++ }
++ buf += 12;
++ }
++#else
++ valid_page = 1;
++#endif
++
++ /* Check that a valid page was requested and the mode data length
++ * isn't too long. */
++ len = buf - buf0;
++ if (!valid_page || len > limit) {
++ curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
++ return -EINVAL;
++ }
++
++ /* Store the mode data length */
++ if (mscmnd == SC_MODE_SENSE_6)
++ buf0[0] = len - 1;
++ else
++ put_be16(buf0, len - 2);
++ return len;
++}
++
++static int do_start_stop(struct fsg_dev *fsg)
++{
++ struct lun *curlun = fsg->curlun;
++ int loej, start;
++
++ /* int immed = fsg->cmnd[1] & 0x01; */
++ loej = fsg->cmnd[4] & 0x02;
++ start = fsg->cmnd[4] & 0x01;
++
++ if (loej) {
++ /* eject request from the host */
++ if (backing_file_is_open(curlun)) {
++ close_backing_file(fsg, curlun);
++ curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT;
++ }
++ }
++
++ return 0;
++}
++
++static int do_prevent_allow(struct fsg_dev *fsg)
++{
++ struct lun *curlun = fsg->curlun;
++ int prevent;
++
++ prevent = fsg->cmnd[4] & 0x01;
++ if ((fsg->cmnd[4] & ~0x01) != 0) { /* Mask away Prevent */
++ curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
++ return -EINVAL;
++ }
++
++ if (curlun->prevent_medium_removal && !prevent)
++ fsync_sub(curlun);
++ curlun->prevent_medium_removal = prevent;
++ return 0;
++}
++
++
++static int do_read_format_capacities(struct fsg_dev *fsg,
++ struct fsg_buffhd *bh)
++{
++ struct lun *curlun = fsg->curlun;
++ u8 *buf = (u8 *) bh->buf;
++
++ buf[0] = buf[1] = buf[2] = 0;
++ buf[3] = 8; /* Only the Current/Maximum Capacity Descriptor */
++ buf += 4;
++
++ put_be32(&buf[0], curlun->num_sectors); /* Number of blocks */
++ put_be32(&buf[4], 512); /* Block length */
++ buf[4] = 0x02; /* Current capacity */
++ return 12;
++}
++
++
++static int do_mode_select(struct fsg_dev *fsg, struct fsg_buffhd *bh)
++{
++ struct lun *curlun = fsg->curlun;
++
++ /* We don't support MODE SELECT */
++ curlun->sense_data = SS_INVALID_COMMAND;
++ return -EINVAL;
++}
++
++
++/*-------------------------------------------------------------------------*/
++#if 0
++static int write_zero(struct fsg_dev *fsg)
++{
++ struct fsg_buffhd *bh;
++ int rc;
++
++ DBG(fsg, "write_zero\n");
++ /* Wait for the next buffer to become available */
++ bh = fsg->next_buffhd_to_fill;
++ while (bh->state != BUF_STATE_EMPTY) {
++ rc = sleep_thread(fsg);
++ if (rc)
++ return rc;
++ }
++
++ bh->inreq->length = 0;
++ start_transfer(fsg, fsg->bulk_in, bh->inreq,
++ &bh->inreq_busy, &bh->state);
++
++ fsg->next_buffhd_to_fill = bh->next;
++ return 0;
++}
++#endif
++
++static int throw_away_data(struct fsg_dev *fsg)
++{
++ struct fsg_buffhd *bh;
++ u32 amount;
++ int rc;
++
++ DBG(fsg, "throw_away_data\n");
++ while ((bh = fsg->next_buffhd_to_drain)->state != BUF_STATE_EMPTY ||
++ fsg->usb_amount_left > 0) {
++
++ /* Throw away the data in a filled buffer */
++ if (bh->state == BUF_STATE_FULL) {
++ smp_rmb();
++ bh->state = BUF_STATE_EMPTY;
++ fsg->next_buffhd_to_drain = bh->next;
++
++ /* A short packet or an error ends everything */
++ if (bh->outreq->actual != bh->outreq->length ||
++ bh->outreq->status != 0) {
++ raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
++ return -EINTR;
++ }
++ continue;
++ }
++
++ /* Try to submit another request if we need one */
++ bh = fsg->next_buffhd_to_fill;
++ if (bh->state == BUF_STATE_EMPTY && fsg->usb_amount_left > 0) {
++ amount = min(fsg->usb_amount_left, (u32) fsg->buf_size);
++
++ /* amount is always divisible by 512, hence by
++ * the bulk-out maxpacket size */
++ bh->outreq->length = bh->bulk_out_intended_length =
++ amount;
++ start_transfer(fsg, fsg->bulk_out, bh->outreq,
++ &bh->outreq_busy, &bh->state);
++ fsg->next_buffhd_to_fill = bh->next;
++ fsg->usb_amount_left -= amount;
++ continue;
++ }
++
++ /* Otherwise wait for something to happen */
++ rc = sleep_thread(fsg);
++ if (rc)
++ return rc;
++ }
++ return 0;
++}
++
++
++static int finish_reply(struct fsg_dev *fsg)
++{
++ struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
++ int rc = 0;
++
++ switch (fsg->data_dir) {
++ case DATA_DIR_NONE:
++ break; /* Nothing to send */
++
++ case DATA_DIR_UNKNOWN:
++ rc = -EINVAL;
++ break;
++
++ /* All but the last buffer of data must have already been sent */
++ case DATA_DIR_TO_HOST:
++ if (fsg->data_size == 0)
++ ; /* Nothing to send */
++
++ /* If there's no residue, simply send the last buffer */
++ else if (fsg->residue == 0) {
++ start_transfer(fsg, fsg->bulk_in, bh->inreq,
++ &bh->inreq_busy, &bh->state);
++ fsg->next_buffhd_to_fill = bh->next;
++ } else {
++ start_transfer(fsg, fsg->bulk_in, bh->inreq,
++ &bh->inreq_busy, &bh->state);
++ fsg->next_buffhd_to_fill = bh->next;
++#if 0
++ /* this is unnecessary, and was causing problems with MacOS */
++ if (bh->inreq->length > 0)
++ write_zero(fsg);
++#endif
++ }
++ break;
++
++ /* We have processed all we want from the data the host has sent.
++ * There may still be outstanding bulk-out requests. */
++ case DATA_DIR_FROM_HOST:
++ if (fsg->residue == 0)
++ ; /* Nothing to receive */
++
++ /* Did the host stop sending unexpectedly early? */
++ else if (fsg->short_packet_received) {
++ raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
++ rc = -EINTR;
++ }
++
++ /* We haven't processed all the incoming data. Even though
++ * we may be allowed to stall, doing so would cause a race.
++ * The controller may already have ACK'ed all the remaining
++ * bulk-out packets, in which case the host wouldn't see a
++ * STALL. Not realizing the endpoint was halted, it wouldn't
++ * clear the halt -- leading to problems later on. */
++#if 0
++ fsg_set_halt(fsg, fsg->bulk_out);
++ raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
++ rc = -EINTR;
++#endif
++
++ /* We can't stall. Read in the excess data and throw it
++ * all away. */
++ else
++ rc = throw_away_data(fsg);
++ break;
++ }
++ return rc;
++}
++
++
++static int send_status(struct fsg_dev *fsg)
++{
++ struct lun *curlun = fsg->curlun;
++ struct fsg_buffhd *bh;
++ int rc;
++ u8 status = USB_STATUS_PASS;
++ u32 sd, sdinfo = 0;
++ struct bulk_cs_wrap *csw;
++
++ DBG(fsg, "send_status\n");
++ /* Wait for the next buffer to become available */
++ bh = fsg->next_buffhd_to_fill;
++ while (bh->state != BUF_STATE_EMPTY) {
++ rc = sleep_thread(fsg);
++ if (rc)
++ return rc;
++ }
++
++ if (curlun) {
++ sd = curlun->sense_data;
++ sdinfo = curlun->sense_data_info;
++ } else if (fsg->bad_lun_okay)
++ sd = SS_NO_SENSE;
++ else
++ sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
++
++ if (fsg->phase_error) {
++ DBG(fsg, "sending phase-error status\n");
++ status = USB_STATUS_PHASE_ERROR;
++ sd = SS_INVALID_COMMAND;
++ } else if (sd != SS_NO_SENSE) {
++ DBG(fsg, "sending command-failure status\n");
++ status = USB_STATUS_FAIL;
++ VDBG(fsg, " sense data: SK x%02x, ASC x%02x, ASCQ x%02x;"
++ " info x%x\n",
++ SK(sd), ASC(sd), ASCQ(sd), sdinfo);
++ }
++
++ csw = bh->buf;
++
++ /* Store and send the Bulk-only CSW */
++ csw->Signature = __constant_cpu_to_le32(USB_BULK_CS_SIG);
++ csw->Tag = fsg->tag;
++ csw->Residue = cpu_to_le32(fsg->residue);
++ csw->Status = status;
++
++ bh->inreq->length = USB_BULK_CS_WRAP_LEN;
++ start_transfer(fsg, fsg->bulk_in, bh->inreq,
++ &bh->inreq_busy, &bh->state);
++
++ fsg->next_buffhd_to_fill = bh->next;
++ return 0;
++}
++
++
++/*-------------------------------------------------------------------------*/
++
++/* Check whether the command is properly formed and whether its data size
++ * and direction agree with the values we already have. */
++static int check_command(struct fsg_dev *fsg, int cmnd_size,
++ enum data_direction data_dir, unsigned int mask,
++ int needs_medium, const char *name)
++{
++ int i;
++ int lun = fsg->cmnd[1] >> 5;
++ static const char dirletter[4] = {'u', 'o', 'i', 'n'};
++ char hdlen[20];
++ struct lun *curlun;
++
++ hdlen[0] = 0;
++ if (fsg->data_dir != DATA_DIR_UNKNOWN)
++ sprintf(hdlen, ", H%c=%u", dirletter[(int) fsg->data_dir],
++ fsg->data_size);
++ VDBG(fsg, "SCSI command: %s; Dc=%d, D%c=%u; Hc=%d%s\n",
++ name, cmnd_size, dirletter[(int) data_dir],
++ fsg->data_size_from_cmnd, fsg->cmnd_size, hdlen);
++
++ /* We can't reply at all until we know the correct data direction
++ * and size. */
++ if (fsg->data_size_from_cmnd == 0)
++ data_dir = DATA_DIR_NONE;
++ if (fsg->data_dir == DATA_DIR_UNKNOWN) { /* CB or CBI */
++ fsg->data_dir = data_dir;
++ fsg->data_size = fsg->data_size_from_cmnd;
++
++ } else { /* Bulk-only */
++ if (fsg->data_size < fsg->data_size_from_cmnd) {
++
++ /* Host data size < Device data size is a phase error.
++ * Carry out the command, but only transfer as much
++ * as we are allowed. */
++ DBG(fsg, "phase error 1\n");
++ fsg->data_size_from_cmnd = fsg->data_size;
++ fsg->phase_error = 1;
++ }
++ }
++ fsg->residue = fsg->usb_amount_left = fsg->data_size;
++
++ /* Conflicting data directions is a phase error */
++ if (fsg->data_dir != data_dir && fsg->data_size_from_cmnd > 0) {
++ fsg->phase_error = 1;
++ DBG(fsg, "phase error 2\n");
++ return -EINVAL;
++ }
++
++ /* Verify the length of the command itself */
++ if (cmnd_size != fsg->cmnd_size) {
++
++ /* Special case workaround: MS-Windows issues REQUEST SENSE
++ * with cbw->Length == 12 (it should be 6). */
++ if (fsg->cmnd[0] == SC_REQUEST_SENSE && fsg->cmnd_size == 12)
++ cmnd_size = fsg->cmnd_size;
++ else {
++ fsg->phase_error = 1;
++ return -EINVAL;
++ }
++ }
++
++ /* Check that the LUN values are consistent */
++ if (fsg->lun != lun)
++ DBG(fsg, "using LUN %d from CBW, "
++ "not LUN %d from CDB\n",
++ fsg->lun, lun);
++
++ /* Check the LUN */
++ if (fsg->lun >= 0 && fsg->lun < fsg->nluns) {
++ fsg->curlun = curlun = &fsg->luns[fsg->lun];
++ if (fsg->cmnd[0] != SC_REQUEST_SENSE) {
++ curlun->sense_data = SS_NO_SENSE;
++ curlun->sense_data_info = 0;
++ curlun->info_valid = 0;
++ }
++ } else {
++ fsg->curlun = curlun = NULL;
++ fsg->bad_lun_okay = 0;
++
++ /* INQUIRY and REQUEST SENSE commands are explicitly allowed
++ * to use unsupported LUNs; all others may not. */
++ if (fsg->cmnd[0] != SC_INQUIRY &&
++ fsg->cmnd[0] != SC_REQUEST_SENSE) {
++ DBG(fsg, "unsupported LUN %d\n", fsg->lun);
++ return -EINVAL;
++ }
++ }
++
++ /* If a unit attention condition exists, only INQUIRY and
++ * REQUEST SENSE commands are allowed; anything else must fail. */
++ if (curlun && curlun->unit_attention_data != SS_NO_SENSE &&
++ fsg->cmnd[0] != SC_INQUIRY &&
++ fsg->cmnd[0] != SC_REQUEST_SENSE) {
++ curlun->sense_data = curlun->unit_attention_data;
++ curlun->unit_attention_data = SS_NO_SENSE;
++ return -EINVAL;
++ }
++
++ /* Check that only command bytes listed in the mask are non-zero */
++ fsg->cmnd[1] &= 0x1f; /* Mask away the LUN */
++ for (i = 1; i < cmnd_size; ++i) {
++ if (fsg->cmnd[i] && !(mask & (1 << i))) {
++ if (curlun)
++ curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
++ DBG(fsg, "SS_INVALID_FIELD_IN_CDB\n");
++ return -EINVAL;
++ }
++ }
++
++ /* If the medium isn't mounted and the command needs to access
++ * it, return an error. */
++ if (curlun && !backing_file_is_open(curlun) && needs_medium) {
++ curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
++ DBG(fsg, "SS_MEDIUM_NOT_PRESENT\n");
++ return -EINVAL;
++ }
++
++ return 0;
++}
++
++
++static int do_scsi_command(struct fsg_dev *fsg)
++{
++ struct fsg_buffhd *bh;
++ int rc;
++ int reply = -EINVAL;
++ int i;
++ static char unknown[16];
++
++ dump_cdb(fsg);
++
++ /* Wait for the next buffer to become available for data or status */
++ bh = fsg->next_buffhd_to_drain = fsg->next_buffhd_to_fill;
++ while (bh->state != BUF_STATE_EMPTY) {
++ rc = sleep_thread(fsg);
++ if (rc)
++ return rc;
++ }
++ fsg->phase_error = 0;
++ fsg->short_packet_received = 0;
++
++ down_read(&fsg->filesem); /* We're using the backing file */
++ switch (fsg->cmnd[0]) {
++
++ case SC_INQUIRY:
++ fsg->data_size_from_cmnd = fsg->cmnd[4];
++ if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
++ (1<<4), 0,
++ "INQUIRY")) == 0)
++ reply = do_inquiry(fsg, bh);
++ break;
++
++ case SC_MODE_SELECT_6:
++ fsg->data_size_from_cmnd = fsg->cmnd[4];
++ if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
++ (1<<1) | (1<<4), 0,
++ "MODE SELECT(6)")) == 0)
++ reply = do_mode_select(fsg, bh);
++ break;
++
++ case SC_MODE_SELECT_10:
++ fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
++ if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
++ (1<<1) | (3<<7), 0,
++ "MODE SELECT(10)")) == 0)
++ reply = do_mode_select(fsg, bh);
++ break;
++
++ case SC_MODE_SENSE_6:
++ fsg->data_size_from_cmnd = fsg->cmnd[4];
++ if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
++ (1<<1) | (1<<2) | (1<<4), 0,
++ "MODE SENSE(6)")) == 0)
++ reply = do_mode_sense(fsg, bh);
++ break;
++
++ case SC_MODE_SENSE_10:
++ fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
++ if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
++ (1<<1) | (1<<2) | (3<<7), 0,
++ "MODE SENSE(10)")) == 0)
++ reply = do_mode_sense(fsg, bh);
++ break;
++
++ case SC_PREVENT_ALLOW_MEDIUM_REMOVAL:
++ fsg->data_size_from_cmnd = 0;
++ if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
++ (1<<4), 0,
++ "PREVENT-ALLOW MEDIUM REMOVAL")) == 0)
++ reply = do_prevent_allow(fsg);
++ break;
++
++ case SC_READ_6:
++ i = fsg->cmnd[4];
++ fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
++ if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
++ (7<<1) | (1<<4), 1,
++ "READ(6)")) == 0)
++ reply = do_read(fsg);
++ break;
++
++ case SC_READ_10:
++ fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
++ if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
++ (1<<1) | (0xf<<2) | (3<<7), 1,
++ "READ(10)")) == 0)
++ reply = do_read(fsg);
++ break;
++
++ case SC_READ_12:
++ fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
++ if ((reply = check_command(fsg, 12, DATA_DIR_TO_HOST,
++ (1<<1) | (0xf<<2) | (0xf<<6), 1,
++ "READ(12)")) == 0)
++ reply = do_read(fsg);
++ break;
++
++ case SC_READ_CAPACITY:
++ fsg->data_size_from_cmnd = 8;
++ if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
++ (0xf<<2) | (1<<8), 1,
++ "READ CAPACITY")) == 0)
++ reply = do_read_capacity(fsg, bh);
++ break;
++
++ case SC_READ_FORMAT_CAPACITIES:
++ fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
++ if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
++ (3<<7), 1,
++ "READ FORMAT CAPACITIES")) == 0)
++ reply = do_read_format_capacities(fsg, bh);
++ break;
++
++ case SC_REQUEST_SENSE:
++ fsg->data_size_from_cmnd = fsg->cmnd[4];
++ if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
++ (1<<4), 0,
++ "REQUEST SENSE")) == 0)
++ reply = do_request_sense(fsg, bh);
++ break;
++
++ case SC_START_STOP_UNIT:
++ fsg->data_size_from_cmnd = 0;
++ if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
++ (1<<1) | (1<<4), 0,
++ "START-STOP UNIT")) == 0)
++ reply = do_start_stop(fsg);
++ break;
++
++ case SC_SYNCHRONIZE_CACHE:
++ fsg->data_size_from_cmnd = 0;
++ if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
++ (0xf<<2) | (3<<7), 1,
++ "SYNCHRONIZE CACHE")) == 0)
++ reply = do_synchronize_cache(fsg);
++ break;
++
++ case SC_TEST_UNIT_READY:
++ fsg->data_size_from_cmnd = 0;
++ reply = check_command(fsg, 6, DATA_DIR_NONE,
++ 0, 1,
++ "TEST UNIT READY");
++ break;
++
++ /* Although optional, this command is used by MS-Windows. We
++ * support a minimal version: BytChk must be 0. */
++ case SC_VERIFY:
++ fsg->data_size_from_cmnd = 0;
++ if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
++ (1<<1) | (0xf<<2) | (3<<7), 1,
++ "VERIFY")) == 0)
++ reply = do_verify(fsg);
++ break;
++
++ case SC_WRITE_6:
++ i = fsg->cmnd[4];
++ fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
++ if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
++ (7<<1) | (1<<4), 1,
++ "WRITE(6)")) == 0)
++ reply = do_write(fsg);
++ break;
++
++ case SC_WRITE_10:
++ fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
++ if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
++ (1<<1) | (0xf<<2) | (3<<7), 1,
++ "WRITE(10)")) == 0)
++ reply = do_write(fsg);
++ break;
++
++ case SC_WRITE_12:
++ fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
++ if ((reply = check_command(fsg, 12, DATA_DIR_FROM_HOST,
++ (1<<1) | (0xf<<2) | (0xf<<6), 1,
++ "WRITE(12)")) == 0)
++ reply = do_write(fsg);
++ break;
++
++ /* Some mandatory commands that we recognize but don't implement.
++ * They don't mean much in this setting. It's left as an exercise
++ * for anyone interested to implement RESERVE and RELEASE in terms
++ * of Posix locks. */
++ case SC_FORMAT_UNIT:
++ case SC_RELEASE:
++ case SC_RESERVE:
++ case SC_SEND_DIAGNOSTIC:
++ /* Fall through */
++
++ default:
++ fsg->data_size_from_cmnd = 0;
++ sprintf(unknown, "Unknown x%02x", fsg->cmnd[0]);
++ if ((reply = check_command(fsg, fsg->cmnd_size,
++ DATA_DIR_UNKNOWN, 0xff, 0, unknown)) == 0) {
++ fsg->curlun->sense_data = SS_INVALID_COMMAND;
++ reply = -EINVAL;
++ }
++ break;
++ }
++ up_read(&fsg->filesem);
++
++ VDBG(fsg, "reply: %d, fsg->data_size_from_cmnd: %d\n",
++ reply, fsg->data_size_from_cmnd);
++ if (reply == -EINTR || signal_pending(current))
++ return -EINTR;
++
++ /* Set up the single reply buffer for finish_reply() */
++ if (reply == -EINVAL)
++ reply = 0; /* Error reply length */
++ if (reply >= 0 && fsg->data_dir == DATA_DIR_TO_HOST) {
++ reply = min((u32) reply, fsg->data_size_from_cmnd);
++ bh->inreq->length = reply;
++ bh->state = BUF_STATE_FULL;
++ fsg->residue -= reply;
++ } /* Otherwise it's already set */
++
++ return 0;
++}
++
++
++/*-------------------------------------------------------------------------*/
++
++static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh)
++{
++ struct usb_request *req = bh->outreq;
++ struct bulk_cb_wrap *cbw = req->buf;
++
++ /* Was this a real packet? */
++ if (req->status)
++ return -EINVAL;
++
++ /* Is the CBW valid? */
++ if (req->actual != USB_BULK_CB_WRAP_LEN ||
++ cbw->Signature != __constant_cpu_to_le32(
++ USB_BULK_CB_SIG)) {
++ DBG(fsg, "invalid CBW: len %u sig 0x%x\n",
++ req->actual,
++ le32_to_cpu(cbw->Signature));
++ return -EINVAL;
++ }
++
++ /* Is the CBW meaningful? */
++ if (cbw->Lun >= MAX_LUNS || cbw->Flags & ~USB_BULK_IN_FLAG ||
++ cbw->Length <= 0 || cbw->Length > MAX_COMMAND_SIZE) {
++ DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, "
++ "cmdlen %u\n",
++ cbw->Lun, cbw->Flags, cbw->Length);
++ return -EINVAL;
++ }
++
++ /* Save the command for later */
++ fsg->cmnd_size = cbw->Length;
++ memcpy(fsg->cmnd, cbw->CDB, fsg->cmnd_size);
++ if (cbw->Flags & USB_BULK_IN_FLAG)
++ fsg->data_dir = DATA_DIR_TO_HOST;
++ else
++ fsg->data_dir = DATA_DIR_FROM_HOST;
++ fsg->data_size = le32_to_cpu(cbw->DataTransferLength);
++ if (fsg->data_size == 0)
++ fsg->data_dir = DATA_DIR_NONE;
++ fsg->lun = cbw->Lun;
++ fsg->tag = cbw->Tag;
++ return 0;
++}
++
++
++static int get_next_command(struct fsg_dev *fsg)
++{
++ struct fsg_buffhd *bh;
++ int rc = 0;
++
++ /* Wait for the next buffer to become available */
++ bh = fsg->next_buffhd_to_fill;
++ while (bh->state != BUF_STATE_EMPTY) {
++ rc = sleep_thread(fsg);
++ if (rc)
++ return rc;
++ }
++
++ /* Queue a request to read a Bulk-only CBW */
++ set_bulk_out_req_length(fsg, bh, USB_BULK_CB_WRAP_LEN);
++ start_transfer(fsg, fsg->bulk_out, bh->outreq,
++ &bh->outreq_busy, &bh->state);
++
++ /* We will drain the buffer in software, which means we
++ * can reuse it for the next filling. No need to advance
++ * next_buffhd_to_fill. */
++
++ /* Wait for the CBW to arrive */
++ while (bh->state != BUF_STATE_FULL) {
++ rc = sleep_thread(fsg);
++ if (rc)
++ return rc;
++ }
++ smp_rmb();
++ rc = received_cbw(fsg, bh);
++ bh->state = BUF_STATE_EMPTY;
++
++ return rc;
++}
++
++
++/*-------------------------------------------------------------------------*/
++
++static int enable_endpoint(struct fsg_dev *fsg, struct usb_ep *ep,
++ const struct usb_endpoint_descriptor *d)
++{
++ int rc;
++
++ DBG(fsg, "usb_ep_enable %s\n", ep->name);
++ ep->driver_data = fsg;
++ rc = usb_ep_enable(ep, d);
++ if (rc)
++ ERROR(fsg, "can't enable %s, result %d\n", ep->name, rc);
++ return rc;
++}
++
++static int alloc_request(struct fsg_dev *fsg, struct usb_ep *ep,
++ struct usb_request **preq)
++{
++ *preq = usb_ep_alloc_request(ep, GFP_ATOMIC);
++ if (*preq)
++ return 0;
++ ERROR(fsg, "can't allocate request for %s\n", ep->name);
++ return -ENOMEM;
++}
++
++/*
++ * Reset interface setting and re-init endpoint state (toggle etc).
++ * Call with altsetting < 0 to disable the interface. The only other
++ * available altsetting is 0, which enables the interface.
++ */
++static int do_set_interface(struct fsg_dev *fsg, int altsetting)
++{
++ struct usb_composite_dev *cdev = fsg->cdev;
++ int rc = 0;
++ int i;
++ const struct usb_endpoint_descriptor *d;
++
++ if (fsg->running)
++ DBG(fsg, "reset interface\n");
++
++reset:
++ /* Deallocate the requests */
++ for (i = 0; i < NUM_BUFFERS; ++i) {
++ struct fsg_buffhd *bh = &fsg->buffhds[i];
++
++ if (bh->inreq) {
++ usb_ep_free_request(fsg->bulk_in, bh->inreq);
++ bh->inreq = NULL;
++ }
++ if (bh->outreq) {
++ usb_ep_free_request(fsg->bulk_out, bh->outreq);
++ bh->outreq = NULL;
++ }
++ }
++
++ /* Disable the endpoints */
++ if (fsg->bulk_in_enabled) {
++ DBG(fsg, "usb_ep_disable %s\n", fsg->bulk_in->name);
++ usb_ep_disable(fsg->bulk_in);
++ fsg->bulk_in_enabled = 0;
++ }
++ if (fsg->bulk_out_enabled) {
++ DBG(fsg, "usb_ep_disable %s\n", fsg->bulk_out->name);
++ usb_ep_disable(fsg->bulk_out);
++ fsg->bulk_out_enabled = 0;
++ }
++
++ fsg->running = 0;
++ if (altsetting < 0 || rc != 0)
++ return rc;
++
++ DBG(fsg, "set interface %d\n", altsetting);
++
++ /* Enable the endpoints */
++ d = ep_desc(cdev->gadget, &fs_bulk_in_desc, &hs_bulk_in_desc);
++ if ((rc = enable_endpoint(fsg, fsg->bulk_in, d)) != 0)
++ goto reset;
++ fsg->bulk_in_enabled = 1;
++
++ d = ep_desc(cdev->gadget, &fs_bulk_out_desc, &hs_bulk_out_desc);
++ if ((rc = enable_endpoint(fsg, fsg->bulk_out, d)) != 0)
++ goto reset;
++ fsg->bulk_out_enabled = 1;
++ fsg->bulk_out_maxpacket = le16_to_cpu(d->wMaxPacketSize);
++
++ /* Allocate the requests */
++ for (i = 0; i < NUM_BUFFERS; ++i) {
++ struct fsg_buffhd *bh = &fsg->buffhds[i];
++
++ rc = alloc_request(fsg, fsg->bulk_in, &bh->inreq);
++ if (rc != 0)
++ goto reset;
++ rc = alloc_request(fsg, fsg->bulk_out, &bh->outreq);
++ if (rc != 0)
++ goto reset;
++ bh->inreq->buf = bh->outreq->buf = bh->buf;
++ bh->inreq->context = bh->outreq->context = bh;
++ bh->inreq->complete = bulk_in_complete;
++ bh->outreq->complete = bulk_out_complete;
++ }
++
++ fsg->running = 1;
++ for (i = 0; i < fsg->nluns; ++i)
++ fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
++
++ return rc;
++}
++
++static void adjust_wake_lock(struct fsg_dev *fsg)
++{
++ int ums_active = 0;
++ int i;
++
++ spin_lock_irq(&fsg->lock);
++
++ if (fsg->config) {
++ for (i = 0; i < fsg->nluns; ++i) {
++ if (backing_file_is_open(&fsg->luns[i]))
++ ums_active = 1;
++ }
++ }
++
++ if (ums_active)
++ wake_lock(&fsg->wake_lock);
++ else
++ wake_unlock(&fsg->wake_lock);
++
++ spin_unlock_irq(&fsg->lock);
++}
++
++/*
++ * Change our operational configuration. This code must agree with the code
++ * that returns config descriptors, and with interface altsetting code.
++ *
++ * It's also responsible for power management interactions. Some
++ * configurations might not work with our current power sources.
++ * For now we just assume the gadget is always self-powered.
++ */
++static int do_set_config(struct fsg_dev *fsg, u8 new_config)
++{
++ int rc = 0;
++
++ if (new_config == fsg->config)
++ return rc;
++
++ /* Disable the single interface */
++ if (fsg->config != 0) {
++ DBG(fsg, "reset config\n");
++ fsg->config = 0;
++ rc = do_set_interface(fsg, -1);
++ }
++
++ /* Enable the interface */
++ if (new_config != 0) {
++ fsg->config = new_config;
++ rc = do_set_interface(fsg, 0);
++ if (rc != 0)
++ fsg->config = 0; /* Reset on errors */
++ else
++ INFO(fsg, "config #%d\n", fsg->config);
++ }
++
++ switch_set_state(&fsg->sdev, new_config);
++ adjust_wake_lock(fsg);
++ return rc;
++}
++
++
++/*-------------------------------------------------------------------------*/
++
++static void handle_exception(struct fsg_dev *fsg)
++{
++ siginfo_t info;
++ int sig;
++ int i;
++ struct fsg_buffhd *bh;
++ enum fsg_state old_state;
++ u8 new_config;
++ struct lun *curlun;
++ int rc;
++
++ DBG(fsg, "handle_exception state: %d\n", (int)fsg->state);
++ /* Clear the existing signals. Anything but SIGUSR1 is converted
++ * into a high-priority EXIT exception. */
++ for (;;) {
++ sig = dequeue_signal_lock(current, ¤t->blocked, &info);
++ if (!sig)
++ break;
++ if (sig != SIGUSR1) {
++ if (fsg->state < FSG_STATE_EXIT)
++ DBG(fsg, "Main thread exiting on signal\n");
++ raise_exception(fsg, FSG_STATE_EXIT);
++ }
++ }
++
++ /* Clear out the controller's fifos */
++ if (fsg->bulk_in_enabled)
++ usb_ep_fifo_flush(fsg->bulk_in);
++ if (fsg->bulk_out_enabled)
++ usb_ep_fifo_flush(fsg->bulk_out);
++
++ /* Reset the I/O buffer states and pointers, the SCSI
++ * state, and the exception. Then invoke the handler. */
++ spin_lock_irq(&fsg->lock);
++
++ for (i = 0; i < NUM_BUFFERS; ++i) {
++ bh = &fsg->buffhds[i];
++ bh->state = BUF_STATE_EMPTY;
++ }
++ fsg->next_buffhd_to_fill = fsg->next_buffhd_to_drain =
++ &fsg->buffhds[0];
++
++ new_config = fsg->new_config;
++ old_state = fsg->state;
++
++ if (old_state == FSG_STATE_ABORT_BULK_OUT)
++ fsg->state = FSG_STATE_STATUS_PHASE;
++ else {
++ for (i = 0; i < fsg->nluns; ++i) {
++ curlun = &fsg->luns[i];
++ curlun->prevent_medium_removal = 0;
++ curlun->sense_data = curlun->unit_attention_data =
++ SS_NO_SENSE;
++ curlun->sense_data_info = 0;
++ curlun->info_valid = 0;
++ }
++ fsg->state = FSG_STATE_IDLE;
++ }
++ spin_unlock_irq(&fsg->lock);
++
++ /* Carry out any extra actions required for the exception */
++ switch (old_state) {
++ default:
++ break;
++
++ case FSG_STATE_ABORT_BULK_OUT:
++ DBG(fsg, "FSG_STATE_ABORT_BULK_OUT\n");
++ spin_lock_irq(&fsg->lock);
++ if (fsg->state == FSG_STATE_STATUS_PHASE)
++ fsg->state = FSG_STATE_IDLE;
++ spin_unlock_irq(&fsg->lock);
++ break;
++
++ case FSG_STATE_RESET:
++ /* really not much to do here */
++ break;
++
++ case FSG_STATE_CONFIG_CHANGE:
++ rc = do_set_config(fsg, new_config);
++ if (new_config == 0) {
++ /* We're using the backing file */
++ down_read(&fsg->filesem);
++ fsync_all(fsg);
++ up_read(&fsg->filesem);
++ }
++ break;
++
++ case FSG_STATE_EXIT:
++ case FSG_STATE_TERMINATED:
++ do_set_config(fsg, 0); /* Free resources */
++ spin_lock_irq(&fsg->lock);
++ fsg->state = FSG_STATE_TERMINATED; /* Stop the thread */
++ spin_unlock_irq(&fsg->lock);
++ break;
++ }
++}
++
++
++/*-------------------------------------------------------------------------*/
++
++static int fsg_main_thread(void *fsg_)
++{
++ struct fsg_dev *fsg = fsg_;
++
++ /* Allow the thread to be killed by a signal, but set the signal mask
++ * to block everything but INT, TERM, KILL, and USR1. */
++ allow_signal(SIGINT);
++ allow_signal(SIGTERM);
++ allow_signal(SIGKILL);
++ allow_signal(SIGUSR1);
++
++ /* Allow the thread to be frozen */
++ set_freezable();
++
++ /* Arrange for userspace references to be interpreted as kernel
++ * pointers. That way we can pass a kernel pointer to a routine
++ * that expects a __user pointer and it will work okay. */
++ set_fs(get_ds());
++
++ /* The main loop */
++ while (fsg->state != FSG_STATE_TERMINATED) {
++ if (exception_in_progress(fsg) || signal_pending(current)) {
++ handle_exception(fsg);
++ continue;
++ }
++
++ if (!fsg->running) {
++ sleep_thread(fsg);
++ continue;
++ }
++
++ if (get_next_command(fsg))
++ continue;
++
++ spin_lock_irq(&fsg->lock);
++ if (!exception_in_progress(fsg))
++ fsg->state = FSG_STATE_DATA_PHASE;
++ spin_unlock_irq(&fsg->lock);
++
++ if (do_scsi_command(fsg) || finish_reply(fsg))
++ continue;
++
++ spin_lock_irq(&fsg->lock);
++ if (!exception_in_progress(fsg))
++ fsg->state = FSG_STATE_STATUS_PHASE;
++ spin_unlock_irq(&fsg->lock);
++
++ if (send_status(fsg))
++ continue;
++
++ spin_lock_irq(&fsg->lock);
++ if (!exception_in_progress(fsg))
++ fsg->state = FSG_STATE_IDLE;
++ spin_unlock_irq(&fsg->lock);
++ }
++
++ spin_lock_irq(&fsg->lock);
++ fsg->thread_task = NULL;
++ spin_unlock_irq(&fsg->lock);
++
++ /* In case we are exiting because of a signal, unregister the
++ * gadget driver and close the backing file. */
++ if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags))
++ close_all_backing_files(fsg);
++
++ /* Let the unbind and cleanup routines know the thread has exited */
++ complete_and_exit(&fsg->thread_notifier, 0);
++}
++
++
++/*-------------------------------------------------------------------------*/
++
++/* If the next two routines are called while the gadget is registered,
++ * the caller must own fsg->filesem for writing. */
++
++static int open_backing_file(struct fsg_dev *fsg, struct lun *curlun,
++ const char *filename)
++{
++ int ro;
++ struct file *filp = NULL;
++ int rc = -EINVAL;
++ struct inode *inode = NULL;
++ loff_t size;
++ loff_t num_sectors;
++
++ /* R/W if we can, R/O if we must */
++ ro = curlun->ro;
++ if (!ro) {
++ filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0);
++ if (-EROFS == PTR_ERR(filp))
++ ro = 1;
++ }
++ if (ro)
++ filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0);
++ if (IS_ERR(filp)) {
++ LINFO(curlun, "unable to open backing file: %s\n", filename);
++ return PTR_ERR(filp);
++ }
++
++ if (!(filp->f_mode & FMODE_WRITE))
++ ro = 1;
++
++ if (filp->f_path.dentry)
++ inode = filp->f_path.dentry->d_inode;
++ if (inode && S_ISBLK(inode->i_mode)) {
++ if (bdev_read_only(inode->i_bdev))
++ ro = 1;
++ } else if (!inode || !S_ISREG(inode->i_mode)) {
++ LINFO(curlun, "invalid file type: %s\n", filename);
++ goto out;
++ }
++
++ /* If we can't read the file, it's no good.
++ * If we can't write the file, use it read-only. */
++ if (!filp->f_op || !(filp->f_op->read || filp->f_op->aio_read)) {
++ LINFO(curlun, "file not readable: %s\n", filename);
++ goto out;
++ }
++ if (!(filp->f_op->write || filp->f_op->aio_write))
++ ro = 1;
++
++ size = i_size_read(inode->i_mapping->host);
++ if (size < 0) {
++ LINFO(curlun, "unable to find file size: %s\n", filename);
++ rc = (int) size;
++ goto out;
++ }
++ num_sectors = size >> 9; /* File size in 512-byte sectors */
++ if (num_sectors == 0) {
++ LINFO(curlun, "file too small: %s\n", filename);
++ rc = -ETOOSMALL;
++ goto out;
++ }
++
++ get_file(filp);
++ curlun->ro = ro;
++ curlun->filp = filp;
++ curlun->file_length = size;
++ curlun->num_sectors = num_sectors;
++ LDBG(curlun, "open backing file: %s size: %lld num_sectors: %lld\n",
++ filename, size, num_sectors);
++ rc = 0;
++ adjust_wake_lock(fsg);
++
++out:
++ filp_close(filp, current->files);
++ return rc;
++}
++
++
++static void close_backing_file(struct fsg_dev *fsg, struct lun *curlun)
++{
++ if (curlun->filp) {
++ int rc;
++
++ /*
++ * XXX: San: Ugly hack here added to ensure that
++ * our pages get synced to disk.
++ * Also drop caches here just to be extra-safe
++ */
++ rc = vfs_fsync(curlun->filp, curlun->filp->f_path.dentry, 1);
++ if (rc < 0)
++ printk(KERN_ERR "ums: Error syncing data (%d)\n", rc);
++ /* drop_pagecache and drop_slab are no longer available */
++ /* drop_pagecache(); */
++ /* drop_slab(); */
++
++ LDBG(curlun, "close backing file\n");
++ fput(curlun->filp);
++ curlun->filp = NULL;
++ adjust_wake_lock(fsg);
++ }
++}
++
++static void close_all_backing_files(struct fsg_dev *fsg)
++{
++ int i;
++
++ for (i = 0; i < fsg->nluns; ++i)
++ close_backing_file(fsg, &fsg->luns[i]);
++}
++
++static ssize_t show_file(struct device *dev, struct device_attribute *attr,
++ char *buf)
++{
++ struct lun *curlun = dev_to_lun(dev);
++ struct fsg_dev *fsg = dev_get_drvdata(dev);
++ char *p;
++ ssize_t rc;
++
++ down_read(&fsg->filesem);
++ if (backing_file_is_open(curlun)) { /* Get the complete pathname */
++ p = d_path(&curlun->filp->f_path, buf, PAGE_SIZE - 1);
++ if (IS_ERR(p))
++ rc = PTR_ERR(p);
++ else {
++ rc = strlen(p);
++ memmove(buf, p, rc);
++ buf[rc] = '\n'; /* Add a newline */
++ buf[++rc] = 0;
++ }
++ } else { /* No file, return 0 bytes */
++ *buf = 0;
++ rc = 0;
++ }
++ up_read(&fsg->filesem);
++ return rc;
++}
++
++static ssize_t store_file(struct device *dev, struct device_attribute *attr,
++ const char *buf, size_t count)
++{
++ struct lun *curlun = dev_to_lun(dev);
++ struct fsg_dev *fsg = dev_get_drvdata(dev);
++ int rc = 0;
++
++ DBG(fsg, "store_file: \"%s\"\n", buf);
++#if 0
++ /* disabled because we need to allow closing the backing file if the media was removed */
++ if (curlun->prevent_medium_removal && backing_file_is_open(curlun)) {
++ LDBG(curlun, "eject attempt prevented\n");
++ return -EBUSY; /* "Door is locked" */
++ }
++#endif
++
++ /* Remove a trailing newline */
++ if (count > 0 && buf[count-1] == '\n')
++ ((char *) buf)[count-1] = 0;
++
++ /* Eject current medium */
++ down_write(&fsg->filesem);
++ if (backing_file_is_open(curlun)) {
++ close_backing_file(fsg, curlun);
++ curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT;
++ }
++
++ /* Load new medium */
++ if (count > 0 && buf[0]) {
++ rc = open_backing_file(fsg, curlun, buf);
++ if (rc == 0)
++ curlun->unit_attention_data =
++ SS_NOT_READY_TO_READY_TRANSITION;
++ }
++ up_write(&fsg->filesem);
++ return (rc < 0 ? rc : count);
++}
++
++
++static DEVICE_ATTR(file, 0444, show_file, store_file);
++
++/*-------------------------------------------------------------------------*/
++
++static void fsg_release(struct kref *ref)
++{
++ struct fsg_dev *fsg = container_of(ref, struct fsg_dev, ref);
++
++ kfree(fsg->luns);
++ kfree(fsg);
++}
++
++static void lun_release(struct device *dev)
++{
++ struct fsg_dev *fsg = dev_get_drvdata(dev);
++
++ kref_put(&fsg->ref, fsg_release);
++}
++
++
++/*-------------------------------------------------------------------------*/
++
++static int __init fsg_alloc(void)
++{
++ struct fsg_dev *fsg;
++
++ fsg = kzalloc(sizeof *fsg, GFP_KERNEL);
++ if (!fsg)
++ return -ENOMEM;
++ spin_lock_init(&fsg->lock);
++ init_rwsem(&fsg->filesem);
++ kref_init(&fsg->ref);
++ init_completion(&fsg->thread_notifier);
++
++ the_fsg = fsg;
++ return 0;
++}
++
++static ssize_t print_switch_name(struct switch_dev *sdev, char *buf)
++{
++ return sprintf(buf, "%s\n", DRIVER_NAME);
++}
++
++static ssize_t print_switch_state(struct switch_dev *sdev, char *buf)
++{
++ struct fsg_dev *fsg = container_of(sdev, struct fsg_dev, sdev);
++ return sprintf(buf, "%s\n", (fsg->config ? "online" : "offline"));
++}
++
++static void
++fsg_function_unbind(struct usb_configuration *c, struct usb_function *f)
++{
++ struct fsg_dev *fsg = func_to_dev(f);
++ int i;
++ struct lun *curlun;
++
++ DBG(fsg, "fsg_function_unbind\n");
++ clear_bit(REGISTERED, &fsg->atomic_bitflags);
++
++ /* Unregister the sysfs attribute files and the LUNs */
++ for (i = 0; i < fsg->nluns; ++i) {
++ curlun = &fsg->luns[i];
++ if (curlun->registered) {
++ device_remove_file(&curlun->dev, &dev_attr_file);
++ device_unregister(&curlun->dev);
++ curlun->registered = 0;
++ }
++ }
++
++ /* If the thread isn't already dead, tell it to exit now */
++ if (fsg->state != FSG_STATE_TERMINATED) {
++ raise_exception(fsg, FSG_STATE_EXIT);
++ wait_for_completion(&fsg->thread_notifier);
++
++ /* The cleanup routine waits for this completion also */
++ complete(&fsg->thread_notifier);
++ }
++
++ /* Free the data buffers */
++ for (i = 0; i < NUM_BUFFERS; ++i)
++ kfree(fsg->buffhds[i].buf);
++}
++
++static int __init
++fsg_function_bind(struct usb_configuration *c, struct usb_function *f)
++{
++ struct usb_composite_dev *cdev = c->cdev;
++ struct fsg_dev *fsg = func_to_dev(f);
++ int rc;
++ int i;
++ int id;
++ struct lun *curlun;
++ struct usb_ep *ep;
++ char *pathbuf, *p;
++
++ fsg->cdev = cdev;
++ DBG(fsg, "fsg_function_bind\n");
++
++ dev_attr_file.attr.mode = 0644;
++
++ /* Find out how many LUNs there should be */
++ i = fsg->nluns;
++ if (i == 0)
++ i = 1;
++ if (i > MAX_LUNS) {
++ ERROR(fsg, "invalid number of LUNs: %d\n", i);
++ rc = -EINVAL;
++ goto out;
++ }
++
++ /* Create the LUNs, open their backing files, and register the
++ * LUN devices in sysfs. */
++ fsg->luns = kzalloc(i * sizeof(struct lun), GFP_KERNEL);
++ if (!fsg->luns) {
++ rc = -ENOMEM;
++ goto out;
++ }
++ fsg->nluns = i;
++
++ for (i = 0; i < fsg->nluns; ++i) {
++ curlun = &fsg->luns[i];
++ curlun->ro = 0;
++ curlun->dev.release = lun_release;
++ curlun->dev.parent = &cdev->gadget->dev;
++ dev_set_drvdata(&curlun->dev, fsg);
++ snprintf(curlun->dev.bus_id, BUS_ID_SIZE,
++ "lun%d", i);
++
++ rc = device_register(&curlun->dev);
++ if (rc != 0) {
++ INFO(fsg, "failed to register LUN%d: %d\n", i, rc);
++ goto out;
++ }
++ rc = device_create_file(&curlun->dev, &dev_attr_file);
++ if (rc != 0) {
++ ERROR(fsg, "device_create_file failed: %d\n", rc);
++ device_unregister(&curlun->dev);
++ goto out;
++ }
++ curlun->registered = 1;
++ kref_get(&fsg->ref);
++ }
++
++ /* allocate interface ID(s) */
++ id = usb_interface_id(c, f);
++ if (id < 0)
++ return id;
++ intf_desc.bInterfaceNumber = id;
++
++ ep = usb_ep_autoconfig(cdev->gadget, &fs_bulk_in_desc);
++ if (!ep)
++ goto autoconf_fail;
++ ep->driver_data = fsg; /* claim the endpoint */
++ fsg->bulk_in = ep;
++
++ ep = usb_ep_autoconfig(cdev->gadget, &fs_bulk_out_desc);
++ if (!ep)
++ goto autoconf_fail;
++ ep->driver_data = fsg; /* claim the endpoint */
++ fsg->bulk_out = ep;
++
++ rc = -ENOMEM;
++
++ if (gadget_is_dualspeed(cdev->gadget)) {
++ /* Assume endpoint addresses are the same for both speeds */
++ hs_bulk_in_desc.bEndpointAddress =
++ fs_bulk_in_desc.bEndpointAddress;
++ hs_bulk_out_desc.bEndpointAddress =
++ fs_bulk_out_desc.bEndpointAddress;
++
++ f->hs_descriptors = hs_function;
++ }
++
++ /* Allocate the data buffers */
++ for (i = 0; i < NUM_BUFFERS; ++i) {
++ struct fsg_buffhd *bh = &fsg->buffhds[i];
++
++ /* Allocate for the bulk-in endpoint. We assume that
++ * the buffer will also work with the bulk-out (and
++ * interrupt-in) endpoint. */
++ bh->buf = kmalloc(fsg->buf_size, GFP_KERNEL);
++ if (!bh->buf)
++ goto out;
++ bh->next = bh + 1;
++ }
++ fsg->buffhds[NUM_BUFFERS - 1].next = &fsg->buffhds[0];
++
++ fsg->thread_task = kthread_create(fsg_main_thread, fsg,
++ shortname);
++ if (IS_ERR(fsg->thread_task)) {
++ rc = PTR_ERR(fsg->thread_task);
++ ERROR(fsg, "kthread_create failed: %d\n", rc);
++ goto out;
++ }
++
++ INFO(fsg, "Number of LUNs=%d\n", fsg->nluns);
++
++ pathbuf = kmalloc(PATH_MAX, GFP_KERNEL);
++ for (i = 0; i < fsg->nluns; ++i) {
++ curlun = &fsg->luns[i];
++ if (backing_file_is_open(curlun)) {
++ p = NULL;
++ if (pathbuf) {
++ p = d_path(&curlun->filp->f_path,
++ pathbuf, PATH_MAX);
++ if (IS_ERR(p))
++ p = NULL;
++ }
++ LINFO(curlun, "ro=%d, file: %s\n",
++ curlun->ro, (p ? p : "(error)"));
++ }
++ }
++ kfree(pathbuf);
++
++ set_bit(REGISTERED, &fsg->atomic_bitflags);
++
++ /* Tell the thread to start working */
++ wake_up_process(fsg->thread_task);
++ return 0;
++
++autoconf_fail:
++ ERROR(fsg, "unable to autoconfigure all endpoints\n");
++ rc = -ENOTSUPP;
++
++out:
++ DBG(fsg, "fsg_function_bind failed: %d\n", rc);
++ fsg->state = FSG_STATE_TERMINATED; /* The thread is dead */
++ fsg_function_unbind(c, f);
++ close_all_backing_files(fsg);
++ return rc;
++}
++
++static int fsg_function_set_alt(struct usb_function *f,
++ unsigned intf, unsigned alt)
++{
++ struct fsg_dev *fsg = func_to_dev(f);
++ DBG(fsg, "fsg_function_set_alt intf: %d alt: %d\n", intf, alt);
++ fsg->new_config = 1;
++ raise_exception(fsg, FSG_STATE_CONFIG_CHANGE);
++ return 0;
++}
++
++static void fsg_function_disable(struct usb_function *f)
++{
++ struct fsg_dev *fsg = func_to_dev(f);
++ DBG(fsg, "fsg_function_disable\n");
++ fsg->new_config = 0;
++ raise_exception(fsg, FSG_STATE_CONFIG_CHANGE);
++}
++
++int __init mass_storage_function_add(struct usb_composite_dev *cdev,
++ struct usb_configuration *c, int nluns)
++{
++ int rc;
++ struct fsg_dev *fsg;
++
++ printk(KERN_INFO "mass_storage_function_add\n");
++ rc = fsg_alloc();
++ if (rc)
++ return rc;
++ fsg = the_fsg;
++ fsg->nluns = nluns;
++
++ spin_lock_init(&fsg->lock);
++ init_rwsem(&fsg->filesem);
++ kref_init(&fsg->ref);
++ init_completion(&fsg->thread_notifier);
++
++ the_fsg->buf_size = BULK_BUFFER_SIZE;
++ the_fsg->sdev.name = DRIVER_NAME;
++ the_fsg->sdev.print_name = print_switch_name;
++ the_fsg->sdev.print_state = print_switch_state;
++ rc = switch_dev_register(&the_fsg->sdev);
++ if (rc < 0)
++ goto err_switch_dev_register;
++
++ wake_lock_init(&the_fsg->wake_lock, WAKE_LOCK_SUSPEND,
++ "usb_mass_storage");
++
++ fsg->cdev = cdev;
++ fsg->function.name = shortname;
++ fsg->function.descriptors = fs_function;
++ fsg->function.bind = fsg_function_bind;
++ fsg->function.unbind = fsg_function_unbind;
++ fsg->function.setup = fsg_function_setup;
++ fsg->function.set_alt = fsg_function_set_alt;
++ fsg->function.disable = fsg_function_disable;
++
++ rc = usb_add_function(c, &fsg->function);
++ if (rc != 0)
++ goto err_usb_add_function;
++
++ return 0;
++
++err_usb_add_function:
++ switch_dev_unregister(&the_fsg->sdev);
++err_switch_dev_register:
++ kref_put(&the_fsg->ref, fsg_release);
++
++ return rc;
++}
+--- /dev/null
++++ b/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 */
+--- /dev/null
++++ b/include/linux/usb/android.h
+@@ -0,0 +1,40 @@
++/*
++ * 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;
++};
++
++#endif /* __LINUX_USB_ANDROID_H */
projects / openwrt / svn-archive / archive.git / commitdiff