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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/usb/gadget/file_storage.c
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/usb/gadget/file_storage.c')
-rw-r--r--drivers/usb/gadget/file_storage.c4139
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diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
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+++ b/drivers/usb/gadget/file_storage.c
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+/*
+ * file_storage.c -- File-backed USB Storage Gadget, for USB development
+ *
+ * Copyright (C) 2003-2005 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.
+ */
+
+
+/*
+ * The File-backed Storage Gadget acts as a USB Mass Storage device,
+ * appearing to the host as a disk drive. In addition to providing an
+ * example of a genuinely useful gadget driver for a USB device, it also
+ * illustrates a technique of double-buffering for increased throughput.
+ * Last but not least, it gives an easy way to probe the behavior of the
+ * Mass Storage drivers in a USB host.
+ *
+ * Backing storage is provided by a regular file or a block device, specified
+ * by the "file" module parameter. Access can be limited to read-only by
+ * setting the optional "ro" module parameter. The gadget will indicate that
+ * it has removable media if the optional "removable" module parameter is set.
+ *
+ * The gadget supports the Control-Bulk (CB), Control-Bulk-Interrupt (CBI),
+ * and Bulk-Only (also known as Bulk-Bulk-Bulk or BBB) transports, selected
+ * by the optional "transport" module parameter. It also supports the
+ * following protocols: RBC (0x01), ATAPI or SFF-8020i (0x02), QIC-157 (0c03),
+ * UFI (0x04), SFF-8070i (0x05), and transparent SCSI (0x06), selected by
+ * the optional "protocol" module parameter. In addition, the default
+ * Vendor ID, Product ID, and release number can be overridden.
+ *
+ * There is support for multiple logical units (LUNs), each of which has
+ * its own backing file. The number of LUNs can be set using the optional
+ * "luns" module parameter (anywhere from 1 to 8), and the corresponding
+ * files are specified using comma-separated lists for "file" and "ro".
+ * The default number of LUNs is taken from the number of "file" elements;
+ * it is 1 if "file" is not given. If "removable" is not set then a backing
+ * file must be specified for each LUN. If it is set, then an unspecified
+ * or empty backing filename means the LUN's medium is not loaded.
+ *
+ * Requirements are modest; only a bulk-in and a bulk-out endpoint are
+ * needed (an interrupt-out endpoint is also needed for CBI). The memory
+ * requirement amounts to two 16K buffers, size configurable by a parameter.
+ * Support is included for both full-speed and high-speed operation.
+ *
+ * Module options:
+ *
+ * file=filename[,filename...]
+ * Required if "removable" is not set, names of
+ * the files or block devices used for
+ * backing storage
+ * ro=b[,b...] Default false, booleans for read-only access
+ * removable Default false, boolean for removable media
+ * luns=N Default N = number of filenames, number of
+ * LUNs to support
+ * transport=XXX Default BBB, transport name (CB, CBI, or BBB)
+ * protocol=YYY Default SCSI, protocol name (RBC, 8020 or
+ * ATAPI, QIC, UFI, 8070, or SCSI;
+ * also 1 - 6)
+ * vendor=0xVVVV Default 0x0525 (NetChip), USB Vendor ID
+ * product=0xPPPP Default 0xa4a5 (FSG), USB Product ID
+ * release=0xRRRR Override the USB release number (bcdDevice)
+ * buflen=N Default N=16384, buffer size used (will be
+ * rounded down to a multiple of
+ * PAGE_CACHE_SIZE)
+ * stall Default determined according to the type of
+ * USB device controller (usually true),
+ * boolean to permit the driver to halt
+ * bulk endpoints
+ *
+ * If CONFIG_USB_FILE_STORAGE_TEST is not set, only the "file", "ro",
+ * "removable", and "luns" options are available; default values are used
+ * for everything else.
+ *
+ * The pathnames of the backing files and the ro settings are available in
+ * the attribute files "file" and "ro" in the lun<n> subdirectory of the
+ * gadget's sysfs directory. If the "removable" option is set, writing to
+ * these files will simulate ejecting/loading the medium (writing an empty
+ * line means eject) and adjusting a write-enable tab. Changes to the ro
+ * setting are not allowed when the medium is loaded.
+ *
+ * This gadget driver is heavily based on "Gadget Zero" by David Brownell.
+ */
+
+
+/*
+ * Driver Design
+ *
+ * The FSG driver is fairly straightforward. There is a main kernel
+ * thread that handles most of the work. Interrupt routines field
+ * callbacks from the controller driver: bulk- and interrupt-request
+ * completion notifications, endpoint-0 events, and disconnect events.
+ * Completion events are passed to the main thread by wakeup calls. Many
+ * ep0 requests are handled at interrupt time, but SetInterface,
+ * SetConfiguration, and device reset requests are forwarded to the
+ * thread in the form of "exceptions" using SIGUSR1 signals (since they
+ * should interrupt any ongoing file I/O operations).
+ *
+ * The thread's main routine implements the standard command/data/status
+ * parts of a SCSI interaction. It and its subroutines are full of tests
+ * for pending signals/exceptions -- all this polling is necessary since
+ * the kernel has no setjmp/longjmp equivalents. (Maybe this is an
+ * indication that the driver really wants to be running in userspace.)
+ * An important point is that so long as the thread is alive it keeps an
+ * open reference to the backing file. This will prevent unmounting
+ * the backing file's underlying filesystem and could cause problems
+ * during system shutdown, for example. To prevent such problems, the
+ * thread catches INT, TERM, and KILL signals and converts them into
+ * an EXIT exception.
+ *
+ * In normal operation the main thread is started during the gadget's
+ * fsg_bind() callback and stopped during fsg_unbind(). But it can also
+ * exit when it receives a signal, and there's no point leaving the
+ * gadget running when the thread is dead. So just before the thread
+ * exits, it deregisters the gadget driver. This makes things a little
+ * tricky: The driver is deregistered at two places, and the exiting
+ * thread can indirectly call fsg_unbind() which in turn can tell the
+ * thread to exit. The first problem is resolved through the use of the
+ * REGISTERED atomic bitflag; the driver will only be deregistered once.
+ * The second problem is resolved by having fsg_unbind() check
+ * fsg->state; it won't try to stop the thread if the state is already
+ * FSG_STATE_TERMINATED.
+ *
+ * To provide maximum throughput, the driver uses a circular pipeline of
+ * buffer heads (struct fsg_buffhd). In principle the pipeline can be
+ * arbitrarily long; in practice the benefits don't justify having more
+ * than 2 stages (i.e., double buffering). But it helps to think of the
+ * pipeline as being a long one. Each buffer head contains a bulk-in and
+ * a bulk-out request pointer (since the buffer can be used for both
+ * output and input -- directions always are given from the host's
+ * point of view) as well as a pointer to the buffer and various state
+ * variables.
+ *
+ * Use of the pipeline follows a simple protocol. There is a variable
+ * (fsg->next_buffhd_to_fill) that points to the next buffer head to use.
+ * At any time that buffer head may still be in use from an earlier
+ * request, so each buffer head has a state variable indicating whether
+ * it is EMPTY, FULL, or BUSY. Typical use involves waiting for the
+ * buffer head to be EMPTY, filling the buffer either by file I/O or by
+ * USB I/O (during which the buffer head is BUSY), and marking the buffer
+ * head FULL when the I/O is complete. Then the buffer will be emptied
+ * (again possibly by USB I/O, during which it is marked BUSY) and
+ * finally marked EMPTY again (possibly by a completion routine).
+ *
+ * A module parameter tells the driver to avoid stalling the bulk
+ * endpoints wherever the transport specification allows. This is
+ * necessary for some UDCs like the SuperH, which cannot reliably clear a
+ * halt on a bulk endpoint. However, under certain circumstances the
+ * Bulk-only specification requires a stall. In such cases the driver
+ * will halt the endpoint and set a flag indicating that it should clear
+ * the halt in software during the next device reset. Hopefully this
+ * will permit everything to work correctly. Furthermore, although the
+ * specification allows the bulk-out endpoint to halt when the host sends
+ * too much data, implementing this would cause an unavoidable race.
+ * The driver will always use the "no-stall" approach for OUT transfers.
+ *
+ * One subtle point concerns sending status-stage responses for ep0
+ * requests. Some of these requests, such as device reset, can involve
+ * interrupting an ongoing file I/O operation, which might take an
+ * arbitrarily long time. During that delay the host might give up on
+ * the original ep0 request and issue a new one. When that happens the
+ * driver should not notify the host about completion of the original
+ * request, as the host will no longer be waiting for it. So the driver
+ * assigns to each ep0 request a unique tag, and it keeps track of the
+ * tag value of the request associated with a long-running exception
+ * (device-reset, interface-change, or configuration-change). When the
+ * exception handler is finished, the status-stage response is submitted
+ * only if the current ep0 request tag is equal to the exception request
+ * tag. Thus only the most recently received ep0 request will get a
+ * status-stage response.
+ *
+ * Warning: This driver source file is too long. It ought to be split up
+ * into a header file plus about 3 separate .c files, to handle the details
+ * of the Gadget, USB Mass Storage, and SCSI protocols.
+ */
+
+
+#undef DEBUG
+#undef VERBOSE
+#undef DUMP_MSGS
+
+#include <linux/config.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+#include <linux/bitops.h>
+#include <linux/blkdev.h>
+#include <linux/compiler.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/init.h>
+#include <linux/kernel.h>
+#include <linux/limits.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/pagemap.h>
+#include <linux/rwsem.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/suspend.h>
+#include <linux/utsname.h>
+#include <linux/wait.h>
+
+#include <linux/usb_ch9.h>
+#include <linux/usb_gadget.h>
+
+#include "gadget_chips.h"
+
+
+/*-------------------------------------------------------------------------*/
+
+#define DRIVER_DESC "File-backed Storage Gadget"
+#define DRIVER_NAME "g_file_storage"
+#define DRIVER_VERSION "20 October 2004"
+
+static const char longname[] = DRIVER_DESC;
+static const char shortname[] = DRIVER_NAME;
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Alan Stern");
+MODULE_LICENSE("Dual BSD/GPL");
+
+/* Thanks to NetChip Technologies for donating this product ID.
+ *
+ * DO NOT REUSE THESE IDs with any other driver!! Ever!!
+ * Instead: allocate your own, using normal USB-IF procedures. */
+#define DRIVER_VENDOR_ID 0x0525 // NetChip
+#define DRIVER_PRODUCT_ID 0xa4a5 // Linux-USB File-backed Storage Gadget
+
+
+/*
+ * This driver assumes self-powered hardware and has no way for users to
+ * trigger remote wakeup. It uses autoconfiguration to select endpoints
+ * and endpoint addresses.
+ */
+
+
+/*-------------------------------------------------------------------------*/
+
+#define xprintk(f,level,fmt,args...) \
+ dev_printk(level , &(f)->gadget->dev , fmt , ## args)
+#define yprintk(l,level,fmt,args...) \
+ dev_printk(level , &(l)->dev , fmt , ## args)
+
+#ifdef DEBUG
+#define DBG(fsg,fmt,args...) \
+ xprintk(fsg , KERN_DEBUG , fmt , ## args)
+#define LDBG(lun,fmt,args...) \
+ yprintk(lun , KERN_DEBUG , fmt , ## args)
+#define MDBG(fmt,args...) \
+ printk(KERN_DEBUG DRIVER_NAME ": " fmt , ## args)
+#else
+#define DBG(fsg,fmt,args...) \
+ do { } while (0)
+#define LDBG(lun,fmt,args...) \
+ do { } while (0)
+#define MDBG(fmt,args...) \
+ do { } while (0)
+#undef VERBOSE
+#undef DUMP_MSGS
+#endif /* DEBUG */
+
+#ifdef VERBOSE
+#define VDBG DBG
+#define VLDBG LDBG
+#else
+#define VDBG(fsg,fmt,args...) \
+ do { } while (0)
+#define VLDBG(lun,fmt,args...) \
+ do { } while (0)
+#endif /* VERBOSE */
+
+#define ERROR(fsg,fmt,args...) \
+ xprintk(fsg , KERN_ERR , fmt , ## args)
+#define LERROR(lun,fmt,args...) \
+ yprintk(lun , KERN_ERR , fmt , ## args)
+
+#define WARN(fsg,fmt,args...) \
+ xprintk(fsg , KERN_WARNING , fmt , ## args)
+#define LWARN(lun,fmt,args...) \
+ yprintk(lun , KERN_WARNING , fmt , ## args)
+
+#define INFO(fsg,fmt,args...) \
+ xprintk(fsg , KERN_INFO , fmt , ## args)
+#define LINFO(lun,fmt,args...) \
+ yprintk(lun , KERN_INFO , fmt , ## args)
+
+#define MINFO(fmt,args...) \
+ printk(KERN_INFO DRIVER_NAME ": " fmt , ## args)
+
+
+/*-------------------------------------------------------------------------*/
+
+/* Encapsulate the module parameter settings */
+
+#define MAX_LUNS 8
+
+ /* Arggh! There should be a module_param_array_named macro! */
+static char *file[MAX_LUNS] = {NULL, };
+static int ro[MAX_LUNS] = {0, };
+
+static struct {
+ int num_filenames;
+ int num_ros;
+ unsigned int nluns;
+
+ char *transport_parm;
+ char *protocol_parm;
+ int removable;
+ unsigned short vendor;
+ unsigned short product;
+ unsigned short release;
+ unsigned int buflen;
+ int can_stall;
+
+ int transport_type;
+ char *transport_name;
+ int protocol_type;
+ char *protocol_name;
+
+} mod_data = { // Default values
+ .transport_parm = "BBB",
+ .protocol_parm = "SCSI",
+ .removable = 0,
+ .vendor = DRIVER_VENDOR_ID,
+ .product = DRIVER_PRODUCT_ID,
+ .release = 0xffff, // Use controller chip type
+ .buflen = 16384,
+ .can_stall = 1,
+ };
+
+
+module_param_array(file, charp, &mod_data.num_filenames, S_IRUGO);
+MODULE_PARM_DESC(file, "names of backing files or devices");
+
+module_param_array(ro, bool, &mod_data.num_ros, S_IRUGO);
+MODULE_PARM_DESC(ro, "true to force read-only");
+
+module_param_named(luns, mod_data.nluns, uint, S_IRUGO);
+MODULE_PARM_DESC(luns, "number of LUNs");
+
+module_param_named(removable, mod_data.removable, bool, S_IRUGO);
+MODULE_PARM_DESC(removable, "true to simulate removable media");
+
+
+/* In the non-TEST version, only the module parameters listed above
+ * are available. */
+#ifdef CONFIG_USB_FILE_STORAGE_TEST
+
+module_param_named(transport, mod_data.transport_parm, charp, S_IRUGO);
+MODULE_PARM_DESC(transport, "type of transport (BBB, CBI, or CB)");
+
+module_param_named(protocol, mod_data.protocol_parm, charp, S_IRUGO);
+MODULE_PARM_DESC(protocol, "type of protocol (RBC, 8020, QIC, UFI, "
+ "8070, or SCSI)");
+
+module_param_named(vendor, mod_data.vendor, ushort, S_IRUGO);
+MODULE_PARM_DESC(vendor, "USB Vendor ID");
+
+module_param_named(product, mod_data.product, ushort, S_IRUGO);
+MODULE_PARM_DESC(product, "USB Product ID");
+
+module_param_named(release, mod_data.release, ushort, S_IRUGO);
+MODULE_PARM_DESC(release, "USB release number");
+
+module_param_named(buflen, mod_data.buflen, uint, S_IRUGO);
+MODULE_PARM_DESC(buflen, "I/O buffer size");
+
+module_param_named(stall, mod_data.can_stall, bool, S_IRUGO);
+MODULE_PARM_DESC(stall, "false to prevent bulk stalls");
+
+#endif /* CONFIG_USB_FILE_STORAGE_TEST */
+
+
+/*-------------------------------------------------------------------------*/
+
+/* USB protocol value = the transport method */
+#define USB_PR_CBI 0x00 // Control/Bulk/Interrupt
+#define USB_PR_CB 0x01 // Control/Bulk w/o interrupt
+#define USB_PR_BULK 0x50 // Bulk-only
+
+/* USB subclass value = the protocol encapsulation */
+#define USB_SC_RBC 0x01 // Reduced Block Commands (flash)
+#define USB_SC_8020 0x02 // SFF-8020i, MMC-2, ATAPI (CD-ROM)
+#define USB_SC_QIC 0x03 // QIC-157 (tape)
+#define USB_SC_UFI 0x04 // UFI (floppy)
+#define USB_SC_8070 0x05 // SFF-8070i (removable)
+#define USB_SC_SCSI 0x06 // Transparent SCSI
+
+/* 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
+
+
+/* CBI Interrupt data structure */
+struct interrupt_data {
+ u8 bType;
+ u8 bValue;
+};
+
+#define CBI_INTERRUPT_DATA_LEN 2
+
+/* CBI Accept Device-Specific Command request */
+#define USB_CBI_ADSC_REQUEST 0x00
+
+
+#define MAX_COMMAND_SIZE 16 // Length of a SCSI Command Data Block
+
+/* 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))
+
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * These definitions will permit the compiler to avoid generating code for
+ * parts of the driver that aren't used in the non-TEST version. Even gcc
+ * can recognize when a test of a constant expression yields a dead code
+ * path.
+ */
+
+#ifdef CONFIG_USB_FILE_STORAGE_TEST
+
+#define transport_is_bbb() (mod_data.transport_type == USB_PR_BULK)
+#define transport_is_cbi() (mod_data.transport_type == USB_PR_CBI)
+#define protocol_is_scsi() (mod_data.protocol_type == USB_SC_SCSI)
+
+#else
+
+#define transport_is_bbb() 1
+#define transport_is_cbi() 0
+#define protocol_is_scsi() 1
+
+#endif /* CONFIG_USB_FILE_STORAGE_TEST */
+
+
+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;
+
+ u32 sense_data;
+ u32 sense_data_info;
+ u32 unit_attention_data;
+
+ struct device dev;
+};
+
+#define backing_file_is_open(curlun) ((curlun)->filp != NULL)
+
+static inline 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;
+ dma_addr_t dma;
+ volatile 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;
+ volatile int inreq_busy;
+ struct usb_request *outreq;
+ volatile int outreq_busy;
+};
+
+enum fsg_state {
+ FSG_STATE_COMMAND_PHASE = -10, // This one isn't used anywhere
+ FSG_STATE_DATA_PHASE,
+ FSG_STATE_STATUS_PHASE,
+
+ FSG_STATE_IDLE = 0,
+ FSG_STATE_ABORT_BULK_OUT,
+ FSG_STATE_RESET,
+ FSG_STATE_INTERFACE_CHANGE,
+ FSG_STATE_CONFIG_CHANGE,
+ FSG_STATE_DISCONNECT,
+ 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 {
+ /* lock protects: state, all the req_busy's, and cbbuf_cmnd */
+ spinlock_t lock;
+ struct usb_gadget *gadget;
+
+ /* filesem protects: backing files in use */
+ struct rw_semaphore filesem;
+
+ struct usb_ep *ep0; // Handy copy of gadget->ep0
+ struct usb_request *ep0req; // For control responses
+ volatile unsigned int ep0_req_tag;
+ const char *ep0req_name;
+
+ struct usb_request *intreq; // For interrupt responses
+ volatile int intreq_busy;
+ struct fsg_buffhd *intr_buffhd;
+
+ unsigned int bulk_out_maxpacket;
+ enum fsg_state state; // For exception handling
+ unsigned int exception_req_tag;
+
+ u8 config, new_config;
+
+ unsigned int running : 1;
+ unsigned int bulk_in_enabled : 1;
+ unsigned int bulk_out_enabled : 1;
+ unsigned int intr_in_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 usb_ep *intr_in;
+
+ struct fsg_buffhd *next_buffhd_to_fill;
+ struct fsg_buffhd *next_buffhd_to_drain;
+ struct fsg_buffhd buffhds[NUM_BUFFERS];
+
+ wait_queue_head_t thread_wqh;
+ int thread_wakeup_needed;
+ struct completion thread_notifier;
+ int thread_pid;
+ struct task_struct *thread_task;
+ sigset_t thread_signal_mask;
+
+ 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;
+
+ /* The CB protocol offers no way for a host to know when a command
+ * has completed. As a result the next command may arrive early,
+ * and we will still have to handle it. For that reason we need
+ * a buffer to store new commands when using CB (or CBI, which
+ * does not oblige a host to wait for command completion either). */
+ int cbbuf_cmnd_size;
+ u8 cbbuf_cmnd[MAX_COMMAND_SIZE];
+
+ unsigned int nluns;
+ struct lun *luns;
+ struct lun *curlun;
+ struct completion lun_released;
+};
+
+typedef void (*fsg_routine_t)(struct fsg_dev *);
+
+static int inline 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 inline 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 struct usb_gadget_driver fsg_driver;
+
+static void close_backing_file(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)
+{
+ unsigned int start, num, i;
+ char line[52], *p;
+
+ if (length >= 512)
+ return;
+ DBG(fsg, "%s, length %u:\n", label, length);
+
+ start = 0;
+ while (length > 0) {
+ num = min(length, 16u);
+ p = line;
+ for (i = 0; i < num; ++i) {
+ if (i == 8)
+ *p++ = ' ';
+ sprintf(p, " %02x", buf[i]);
+ p += 3;
+ }
+ *p = 0;
+ printk(KERN_DEBUG "%6x: %s\n", start, line);
+ buf += num;
+ start += num;
+ length -= num;
+ }
+}
+
+static void inline dump_cdb(struct fsg_dev *fsg)
+{}
+
+#else
+
+static void inline dump_msg(struct fsg_dev *fsg, const char *label,
+ const u8 *buf, unsigned int length)
+{}
+
+static void inline dump_cdb(struct fsg_dev *fsg)
+{
+ int i;
+ char cmdbuf[3*MAX_COMMAND_SIZE + 1];
+
+ for (i = 0; i < fsg->cmnd_size; ++i)
+ sprintf(cmdbuf + i*3, " %02x", fsg->cmnd[i]);
+ VDBG(fsg, "SCSI CDB: %s\n", cmdbuf);
+}
+
+#endif /* DUMP_MSGS */
+
+
+static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep)
+{
+ const char *name;
+
+ if (ep == fsg->bulk_in)
+ name = "bulk-in";
+ else if (ep == fsg->bulk_out)
+ name = "bulk-out";
+ else
+ name = ep->name;
+ DBG(fsg, "%s set halt\n", name);
+ return usb_ep_set_halt(ep);
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* Routines for unaligned data access */
+
+static u16 inline get_be16(u8 *buf)
+{
+ return ((u16) buf[0] << 8) | ((u16) buf[1]);
+}
+
+static u32 inline get_be32(u8 *buf)
+{
+ return ((u32) buf[0] << 24) | ((u32) buf[1] << 16) |
+ ((u32) buf[2] << 8) | ((u32) buf[3]);
+}
+
+static void inline put_be16(u8 *buf, u16 val)
+{
+ buf[0] = val >> 8;
+ buf[1] = val;
+}
+
+static void inline put_be32(u8 *buf, u32 val)
+{
+ buf[0] = val >> 24;
+ buf[1] = val >> 16;
+ buf[2] = val >> 8;
+ buf[3] = val;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * 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().
+ */
+#define STRING_MANUFACTURER 1
+#define STRING_PRODUCT 2
+#define STRING_SERIAL 3
+#define STRING_CONFIG 4
+#define STRING_INTERFACE 5
+
+/* There is only one configuration. */
+#define CONFIG_VALUE 1
+
+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,
+
+ /* The next three values can be overridden by module parameters */
+ .idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_ID),
+ .idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_ID),
+ .bcdDevice = __constant_cpu_to_le16(0xffff),
+
+ .iManufacturer = STRING_MANUFACTURER,
+ .iProduct = STRING_PRODUCT,
+ .iSerialNumber = STRING_SERIAL,
+ .bNumConfigurations = 1,
+};
+
+static struct usb_config_descriptor
+config_desc = {
+ .bLength = sizeof config_desc,
+ .bDescriptorType = USB_DT_CONFIG,
+
+ /* wTotalLength computed by usb_gadget_config_buf() */
+ .bNumInterfaces = 1,
+ .bConfigurationValue = CONFIG_VALUE,
+ .iConfiguration = STRING_CONFIG,
+ .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
+ .bMaxPower = 1, // self-powered
+};
+
+static struct usb_otg_descriptor
+otg_desc = {
+ .bLength = sizeof(otg_desc),
+ .bDescriptorType = USB_DT_OTG,
+
+ .bmAttributes = USB_OTG_SRP,
+};
+
+/* 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 = USB_SC_SCSI, // Adjusted during fsg_bind()
+ .bInterfaceProtocol = USB_PR_BULK, // Adjusted during fsg_bind()
+ .iInterface = STRING_INTERFACE,
+};
+
+/* 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_endpoint_descriptor
+fs_intr_in_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_INT,
+ .wMaxPacketSize = __constant_cpu_to_le16(2),
+ .bInterval = 32, // frames -> 32 ms
+};
+
+static const struct usb_descriptor_header *fs_function[] = {
+ (struct usb_descriptor_header *) &otg_desc,
+ (struct usb_descriptor_header *) &intf_desc,
+ (struct usb_descriptor_header *) &fs_bulk_in_desc,
+ (struct usb_descriptor_header *) &fs_bulk_out_desc,
+ (struct usb_descriptor_header *) &fs_intr_in_desc,
+ NULL,
+};
+#define FS_FUNCTION_PRE_EP_ENTRIES 2
+
+
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+
+/*
+ * USB 2.0 devices need to expose both high speed and full speed
+ * descriptors, unless they only run at full speed.
+ *
+ * That means alternate endpoint descriptors (bigger packets)
+ * and a "device qualifier" ... plus more construction options
+ * for the config descriptor.
+ */
+static struct usb_qualifier_descriptor
+dev_qualifier = {
+ .bLength = sizeof dev_qualifier,
+ .bDescriptorType = USB_DT_DEVICE_QUALIFIER,
+
+ .bcdUSB = __constant_cpu_to_le16(0x0200),
+ .bDeviceClass = USB_CLASS_PER_INTERFACE,
+
+ .bNumConfigurations = 1,
+};
+
+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_endpoint_descriptor
+hs_intr_in_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */
+ .bmAttributes = USB_ENDPOINT_XFER_INT,
+ .wMaxPacketSize = __constant_cpu_to_le16(2),
+ .bInterval = 9, // 2**(9-1) = 256 uframes -> 32 ms
+};
+
+static const struct usb_descriptor_header *hs_function[] = {
+ (struct usb_descriptor_header *) &otg_desc,
+ (struct usb_descriptor_header *) &intf_desc,
+ (struct usb_descriptor_header *) &hs_bulk_in_desc,
+ (struct usb_descriptor_header *) &hs_bulk_out_desc,
+ (struct usb_descriptor_header *) &hs_intr_in_desc,
+ NULL,
+};
+#define HS_FUNCTION_PRE_EP_ENTRIES 2
+
+/* Maxpacket and other transfer characteristics vary by speed. */
+#define ep_desc(g,fs,hs) (((g)->speed==USB_SPEED_HIGH) ? (hs) : (fs))
+
+#else
+
+/* If there's no high speed support, always use the full-speed descriptor. */
+#define ep_desc(g,fs,hs) fs
+
+#endif /* !CONFIG_USB_GADGET_DUALSPEED */
+
+
+/* The CBI specification limits the serial string to 12 uppercase hexadecimal
+ * characters. */
+static char manufacturer[64];
+static char serial[13];
+
+/* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */
+static struct usb_string strings[] = {
+ {STRING_MANUFACTURER, manufacturer},
+ {STRING_PRODUCT, longname},
+ {STRING_SERIAL, serial},
+ {STRING_CONFIG, "Self-powered"},
+ {STRING_INTERFACE, "Mass Storage"},
+ {}
+};
+
+static struct usb_gadget_strings stringtab = {
+ .language = 0x0409, // en-us
+ .strings = strings,
+};
+
+
+/*
+ * Config descriptors must agree with the code that sets configurations
+ * and with code managing interfaces and their altsettings. They must
+ * also handle different speeds and other-speed requests.
+ */
+static int populate_config_buf(struct usb_gadget *gadget,
+ u8 *buf, u8 type, unsigned index)
+{
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+ enum usb_device_speed speed = gadget->speed;
+#endif
+ int len;
+ const struct usb_descriptor_header **function;
+
+ if (index > 0)
+ return -EINVAL;
+
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+ if (type == USB_DT_OTHER_SPEED_CONFIG)
+ speed = (USB_SPEED_FULL + USB_SPEED_HIGH) - speed;
+ if (speed == USB_SPEED_HIGH)
+ function = hs_function;
+ else
+#endif
+ function = fs_function;
+
+ /* for now, don't advertise srp-only devices */
+ if (!gadget->is_otg)
+ function++;
+
+ len = usb_gadget_config_buf(&config_desc, buf, EP0_BUFSIZE, function);
+ ((struct usb_config_descriptor *) buf)->bDescriptorType = type;
+ return len;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* These routines may be called in process context or in_irq */
+
+static void wakeup_thread(struct fsg_dev *fsg)
+{
+ /* Tell the main thread that something has happened */
+ fsg->thread_wakeup_needed = 1;
+ wake_up_all(&fsg->thread_wqh);
+}
+
+
+static void raise_exception(struct fsg_dev *fsg, enum fsg_state new_state)
+{
+ unsigned long flags;
+ struct task_struct *thread_task;
+
+ /* 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->exception_req_tag = fsg->ep0_req_tag;
+ fsg->state = new_state;
+ thread_task = fsg->thread_task;
+ if (thread_task)
+ send_sig_info(SIGUSR1, SEND_SIG_FORCED, thread_task);
+ }
+ spin_unlock_irqrestore(&fsg->lock, flags);
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* The disconnect callback and ep0 routines. These always run in_irq,
+ * except that ep0_queue() is called in the main thread to acknowledge
+ * completion of various requests: set config, set interface, and
+ * Bulk-only device reset. */
+
+static void fsg_disconnect(struct usb_gadget *gadget)
+{
+ struct fsg_dev *fsg = get_gadget_data(gadget);
+
+ DBG(fsg, "disconnect or port reset\n");
+ raise_exception(fsg, FSG_STATE_DISCONNECT);
+}
+
+
+static int ep0_queue(struct fsg_dev *fsg)
+{
+ int rc;
+
+ rc = usb_ep_queue(fsg->ep0, fsg->ep0req, GFP_ATOMIC);
+ if (rc != 0 && rc != -ESHUTDOWN) {
+
+ /* We can't do much more than wait for a reset */
+ WARN(fsg, "error in submission: %s --> %d\n",
+ fsg->ep0->name, rc);
+ }
+ return rc;
+}
+
+static void ep0_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct fsg_dev *fsg = (struct fsg_dev *) ep->driver_data;
+
+ if (req->actual > 0)
+ dump_msg(fsg, fsg->ep0req_name, req->buf, req->actual);
+ if (req->status || req->actual != req->length)
+ DBG(fsg, "%s --> %d, %u/%u\n", __FUNCTION__,
+ req->status, req->actual, req->length);
+ if (req->status == -ECONNRESET) // Request was cancelled
+ usb_ep_fifo_flush(ep);
+
+ if (req->status == 0 && req->context)
+ ((fsg_routine_t) (req->context))(fsg);
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* 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 = (struct fsg_dev *) ep->driver_data;
+ struct fsg_buffhd *bh = (struct fsg_buffhd *) req->context;
+
+ if (req->status || req->actual != req->length)
+ DBG(fsg, "%s --> %d, %u/%u\n", __FUNCTION__,
+ req->status, req->actual, req->length);
+ if (req->status == -ECONNRESET) // Request was cancelled
+ usb_ep_fifo_flush(ep);
+
+ /* Hold the lock while we update the request and buffer states */
+ spin_lock(&fsg->lock);
+ bh->inreq_busy = 0;
+ bh->state = BUF_STATE_EMPTY;
+ spin_unlock(&fsg->lock);
+ wakeup_thread(fsg);
+}
+
+static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct fsg_dev *fsg = (struct fsg_dev *) ep->driver_data;
+ struct fsg_buffhd *bh = (struct fsg_buffhd *) 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", __FUNCTION__,
+ req->status, req->actual,
+ bh->bulk_out_intended_length);
+ if (req->status == -ECONNRESET) // Request was cancelled
+ usb_ep_fifo_flush(ep);
+
+ /* Hold the lock while we update the request and buffer states */
+ spin_lock(&fsg->lock);
+ bh->outreq_busy = 0;
+ bh->state = BUF_STATE_FULL;
+ spin_unlock(&fsg->lock);
+ wakeup_thread(fsg);
+}
+
+
+#ifdef CONFIG_USB_FILE_STORAGE_TEST
+static void intr_in_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct fsg_dev *fsg = (struct fsg_dev *) ep->driver_data;
+ struct fsg_buffhd *bh = (struct fsg_buffhd *) req->context;
+
+ if (req->status || req->actual != req->length)
+ DBG(fsg, "%s --> %d, %u/%u\n", __FUNCTION__,
+ req->status, req->actual, req->length);
+ if (req->status == -ECONNRESET) // Request was cancelled
+ usb_ep_fifo_flush(ep);
+
+ /* Hold the lock while we update the request and buffer states */
+ spin_lock(&fsg->lock);
+ fsg->intreq_busy = 0;
+ bh->state = BUF_STATE_EMPTY;
+ spin_unlock(&fsg->lock);
+ wakeup_thread(fsg);
+}
+
+#else
+static void intr_in_complete(struct usb_ep *ep, struct usb_request *req)
+{}
+#endif /* CONFIG_USB_FILE_STORAGE_TEST */
+
+
+/*-------------------------------------------------------------------------*/
+
+/* Ep0 class-specific handlers. These always run in_irq. */
+
+#ifdef CONFIG_USB_FILE_STORAGE_TEST
+static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh)
+{
+ struct usb_request *req = fsg->ep0req;
+ static u8 cbi_reset_cmnd[6] = {
+ SC_SEND_DIAGNOSTIC, 4, 0xff, 0xff, 0xff, 0xff};
+
+ /* Error in command transfer? */
+ if (req->status || req->length != req->actual ||
+ req->actual < 6 || req->actual > MAX_COMMAND_SIZE) {
+
+ /* Not all controllers allow a protocol stall after
+ * receiving control-out data, but we'll try anyway. */
+ fsg_set_halt(fsg, fsg->ep0);
+ return; // Wait for reset
+ }
+
+ /* Is it the special reset command? */
+ if (req->actual >= sizeof cbi_reset_cmnd &&
+ memcmp(req->buf, cbi_reset_cmnd,
+ sizeof cbi_reset_cmnd) == 0) {
+
+ /* Raise an exception to stop the current operation
+ * and reinitialize our state. */
+ DBG(fsg, "cbi reset request\n");
+ raise_exception(fsg, FSG_STATE_RESET);
+ return;
+ }
+
+ VDBG(fsg, "CB[I] accept device-specific command\n");
+ spin_lock(&fsg->lock);
+
+ /* Save the command for later */
+ if (fsg->cbbuf_cmnd_size)
+ WARN(fsg, "CB[I] overwriting previous command\n");
+ fsg->cbbuf_cmnd_size = req->actual;
+ memcpy(fsg->cbbuf_cmnd, req->buf, fsg->cbbuf_cmnd_size);
+
+ spin_unlock(&fsg->lock);
+ wakeup_thread(fsg);
+}
+
+#else
+static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh)
+{}
+#endif /* CONFIG_USB_FILE_STORAGE_TEST */
+
+
+static int class_setup_req(struct fsg_dev *fsg,
+ const struct usb_ctrlrequest *ctrl)
+{
+ struct usb_request *req = fsg->ep0req;
+ int value = -EOPNOTSUPP;
+ u16 w_index = ctrl->wIndex;
+ u16 w_length = ctrl->wLength;
+
+ if (!fsg->config)
+ return value;
+
+ /* Handle Bulk-only class-specific requests */
+ if (transport_is_bbb()) {
+ 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) {
+ 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) {
+ value = -EDOM;
+ break;
+ }
+ VDBG(fsg, "get max LUN\n");
+ *(u8 *) req->buf = fsg->nluns - 1;
+ value = min(w_length, (u16) 1);
+ break;
+ }
+ }
+
+ /* Handle CBI class-specific requests */
+ else {
+ switch (ctrl->bRequest) {
+
+ case USB_CBI_ADSC_REQUEST:
+ if (ctrl->bRequestType != (USB_DIR_OUT |
+ USB_TYPE_CLASS | USB_RECIP_INTERFACE))
+ break;
+ if (w_index != 0) {
+ value = -EDOM;
+ break;
+ }
+ if (w_length > MAX_COMMAND_SIZE) {
+ value = -EOVERFLOW;
+ break;
+ }
+ value = w_length;
+ fsg->ep0req->context = received_cbi_adsc;
+ break;
+ }
+ }
+
+ if (value == -EOPNOTSUPP)
+ VDBG(fsg,
+ "unknown class-specific control req "
+ "%02x.%02x v%04x i%04x l%u\n",
+ ctrl->bRequestType, ctrl->bRequest,
+ ctrl->wValue, w_index, w_length);
+ return value;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* Ep0 standard request handlers. These always run in_irq. */
+
+static int standard_setup_req(struct fsg_dev *fsg,
+ const struct usb_ctrlrequest *ctrl)
+{
+ struct usb_request *req = fsg->ep0req;
+ int value = -EOPNOTSUPP;
+ u16 w_index = ctrl->wIndex;
+ u16 w_value = ctrl->wValue;
+ u16 w_length = ctrl->wLength;
+
+ /* Usually this just stores reply data in the pre-allocated ep0 buffer,
+ * but config change events will also reconfigure hardware. */
+ switch (ctrl->bRequest) {
+
+ case USB_REQ_GET_DESCRIPTOR:
+ if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
+ USB_RECIP_DEVICE))
+ break;
+ switch (w_value >> 8) {
+
+ case USB_DT_DEVICE:
+ VDBG(fsg, "get device descriptor\n");
+ value = min(w_length, (u16) sizeof device_desc);
+ memcpy(req->buf, &device_desc, value);
+ break;
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+ case USB_DT_DEVICE_QUALIFIER:
+ VDBG(fsg, "get device qualifier\n");
+ if (!fsg->gadget->is_dualspeed)
+ break;
+ value = min(w_length, (u16) sizeof dev_qualifier);
+ memcpy(req->buf, &dev_qualifier, value);
+ break;
+
+ case USB_DT_OTHER_SPEED_CONFIG:
+ VDBG(fsg, "get other-speed config descriptor\n");
+ if (!fsg->gadget->is_dualspeed)
+ break;
+ goto get_config;
+#endif
+ case USB_DT_CONFIG:
+ VDBG(fsg, "get configuration descriptor\n");
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+ get_config:
+#endif
+ value = populate_config_buf(fsg->gadget,
+ req->buf,
+ w_value >> 8,
+ w_value & 0xff);
+ if (value >= 0)
+ value = min(w_length, (u16) value);
+ break;
+
+ case USB_DT_STRING:
+ VDBG(fsg, "get string descriptor\n");
+
+ /* wIndex == language code */
+ value = usb_gadget_get_string(&stringtab,
+ w_value & 0xff, req->buf);
+ if (value >= 0)
+ value = min(w_length, (u16) value);
+ break;
+ }
+ break;
+
+ /* One config, two speeds */
+ case USB_REQ_SET_CONFIGURATION:
+ if (ctrl->bRequestType != (USB_DIR_OUT | USB_TYPE_STANDARD |
+ USB_RECIP_DEVICE))
+ break;
+ VDBG(fsg, "set configuration\n");
+ if (w_value == CONFIG_VALUE || w_value == 0) {
+ fsg->new_config = w_value;
+
+ /* Raise an exception to wipe out previous transaction
+ * state (queued bufs, etc) and set the new config. */
+ raise_exception(fsg, FSG_STATE_CONFIG_CHANGE);
+ value = DELAYED_STATUS;
+ }
+ break;
+ case USB_REQ_GET_CONFIGURATION:
+ if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
+ USB_RECIP_DEVICE))
+ break;
+ VDBG(fsg, "get configuration\n");
+ *(u8 *) req->buf = fsg->config;
+ value = min(w_length, (u16) 1);
+ break;
+
+ case USB_REQ_SET_INTERFACE:
+ if (ctrl->bRequestType != (USB_DIR_OUT| USB_TYPE_STANDARD |
+ USB_RECIP_INTERFACE))
+ break;
+ if (fsg->config && w_index == 0) {
+
+ /* Raise an exception to wipe out previous transaction
+ * state (queued bufs, etc) and install the new
+ * interface altsetting. */
+ raise_exception(fsg, FSG_STATE_INTERFACE_CHANGE);
+ value = DELAYED_STATUS;
+ }
+ break;
+ case USB_REQ_GET_INTERFACE:
+ if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
+ USB_RECIP_INTERFACE))
+ break;
+ if (!fsg->config)
+ break;
+ if (w_index != 0) {
+ value = -EDOM;
+ break;
+ }
+ VDBG(fsg, "get interface\n");
+ *(u8 *) req->buf = 0;
+ value = min(w_length, (u16) 1);
+ break;
+
+ default:
+ VDBG(fsg,
+ "unknown control req %02x.%02x v%04x i%04x l%u\n",
+ ctrl->bRequestType, ctrl->bRequest,
+ w_value, w_index, w_length);
+ }
+
+ return value;
+}
+
+
+static int fsg_setup(struct usb_gadget *gadget,
+ const struct usb_ctrlrequest *ctrl)
+{
+ struct fsg_dev *fsg = get_gadget_data(gadget);
+ int rc;
+
+ ++fsg->ep0_req_tag; // Record arrival of a new request
+ fsg->ep0req->context = NULL;
+ fsg->ep0req->length = 0;
+ dump_msg(fsg, "ep0-setup", (u8 *) ctrl, sizeof(*ctrl));
+
+ if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS)
+ rc = class_setup_req(fsg, ctrl);
+ else
+ rc = standard_setup_req(fsg, ctrl);
+
+ /* Respond with data/status or defer until later? */
+ if (rc >= 0 && rc != DELAYED_STATUS) {
+ fsg->ep0req->length = rc;
+ fsg->ep0req->zero = (rc < ctrl->wLength &&
+ (rc % gadget->ep0->maxpacket) == 0);
+ fsg->ep0req_name = (ctrl->bRequestType & USB_DIR_IN ?
+ "ep0-in" : "ep0-out");
+ rc = ep0_queue(fsg);
+ }
+
+ /* Device either stalls (rc < 0) or reports success */
+ return rc;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* 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, volatile int *pbusy,
+ volatile enum fsg_buffer_state *state)
+{
+ int rc;
+
+ if (ep == fsg->bulk_in)
+ dump_msg(fsg, "bulk-in", req->buf, req->length);
+ else if (ep == fsg->intr_in)
+ dump_msg(fsg, "intr-in", req->buf, req->length);
+ *pbusy = 1;
+ *state = BUF_STATE_BUSY;
+ 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->name, rc);
+ }
+}
+
+
+static int sleep_thread(struct fsg_dev *fsg)
+{
+ int rc;
+
+ /* Wait until a signal arrives or we are woken up */
+ rc = wait_event_interruptible(fsg->thread_wqh,
+ fsg->thread_wakeup_needed);
+ fsg->thread_wakeup_needed = 0;
+ if (current->flags & PF_FREEZE)
+ refrigerator(PF_FREEZE);
+ return (rc ? -EINTR : 0);
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+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, mod_data.buflen);
+ 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) {
+ if ((rc = sleep_thread(fsg)) != 0)
+ 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;
+ 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;
+ break;
+ }
+
+ if (amount_left == 0)
+ break; // No more left to read
+
+ /* Send this buffer and go read some more */
+ bh->inreq->zero = 0;
+ 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, mod_data.buflen);
+ 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;
+ 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) {
+ 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;
+ 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;
+ 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 */
+ if ((rc = sleep_thread(fsg)) != 0)
+ return rc;
+ }
+
+ return -EIO; // No default reply
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* Sync the file data, don't bother with the metadata.
+ * 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_dentry->d_inode;
+ down(&inode->i_sem);
+ current->flags |= PF_SYNCWRITE;
+ rc = filemap_fdatawrite(inode->i_mapping);
+ err = filp->f_op->fsync(filp, filp->f_dentry, 1);
+ if (!rc)
+ rc = err;
+ err = filemap_fdatawait(inode->i_mapping);
+ if (!rc)
+ rc = err;
+ current->flags &= ~PF_SYNCWRITE;
+ up(&inode->i_sem);
+ 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_dentry->d_inode;
+ unsigned long rc;
+
+ rc = invalidate_inode_pages(inode->i_mapping);
+ 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, mod_data.buflen);
+ 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;
+ 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;
+ 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;
+
+ static char vendor_id[] = "Linux ";
+ static char product_id[] = "File-Stor Gadget";
+
+ 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
+ if (mod_data.removable)
+ buf[1] = 0x80;
+ 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", vendor_id, product_id,
+ mod_data.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;
+
+ /*
+ * 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;
+ } else {
+ sd = curlun->sense_data;
+ sdinfo = curlun->sense_data_info;
+ curlun->sense_data = SS_NO_SENSE;
+ curlun->sense_data_info = 0;
+ }
+
+ memset(buf, 0, 18);
+ buf[0] = 0x80 | 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; // Should really be mod_data.buflen
+ }
+
+ /* No block descriptors */
+
+ /* 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
+ put_be16(&buf[10], 0xffff); // Maximum prefetch ceiling
+ }
+ buf += 12;
+ }
+
+ /* 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;
+
+ if (!mod_data.removable) {
+ curlun->sense_data = SS_INVALID_COMMAND;
+ return -EINVAL;
+ }
+
+ // int immed = fsg->cmnd[1] & 0x01;
+ loej = fsg->cmnd[4] & 0x02;
+ start = fsg->cmnd[4] & 0x01;
+
+#ifdef CONFIG_USB_FILE_STORAGE_TEST
+ if ((fsg->cmnd[1] & ~0x01) != 0 || // Mask away Immed
+ (fsg->cmnd[4] & ~0x03) != 0) { // Mask LoEj, Start
+ curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
+ return -EINVAL;
+ }
+
+ if (!start) {
+
+ /* Are we allowed to unload the media? */
+ if (curlun->prevent_medium_removal) {
+ LDBG(curlun, "unload attempt prevented\n");
+ curlun->sense_data = SS_MEDIUM_REMOVAL_PREVENTED;
+ return -EINVAL;
+ }
+ if (loej) { // Simulate an unload/eject
+ up_read(&fsg->filesem);
+ down_write(&fsg->filesem);
+ close_backing_file(curlun);
+ up_write(&fsg->filesem);
+ down_read(&fsg->filesem);
+ }
+ } else {
+
+ /* Our emulation doesn't support mounting; the medium is
+ * available for use as soon as it is loaded. */
+ if (!backing_file_is_open(curlun)) {
+ curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
+ return -EINVAL;
+ }
+ }
+#endif
+ return 0;
+}
+
+
+static int do_prevent_allow(struct fsg_dev *fsg)
+{
+ struct lun *curlun = fsg->curlun;
+ int prevent;
+
+ if (!mod_data.removable) {
+ curlun->sense_data = SS_INVALID_COMMAND;
+ return -EINVAL;
+ }
+
+ 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;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+static int halt_bulk_in_endpoint(struct fsg_dev *fsg)
+{
+ int rc;
+
+ rc = fsg_set_halt(fsg, fsg->bulk_in);
+ if (rc == -EAGAIN)
+ VDBG(fsg, "delayed bulk-in endpoint halt\n");
+ while (rc != 0) {
+ if (rc != -EAGAIN) {
+ WARN(fsg, "usb_ep_set_halt -> %d\n", rc);
+ rc = 0;
+ break;
+ }
+
+ /* Wait for a short time and then try again */
+ if (msleep_interruptible(100) != 0)
+ return -EINTR;
+ rc = usb_ep_set_halt(fsg->bulk_in);
+ }
+ return rc;
+}
+
+static int pad_with_zeros(struct fsg_dev *fsg)
+{
+ struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
+ u32 nkeep = bh->inreq->length;
+ u32 nsend;
+ int rc;
+
+ bh->state = BUF_STATE_EMPTY; // For the first iteration
+ fsg->usb_amount_left = nkeep + fsg->residue;
+ while (fsg->usb_amount_left > 0) {
+
+ /* Wait for the next buffer to be free */
+ while (bh->state != BUF_STATE_EMPTY) {
+ if ((rc = sleep_thread(fsg)) != 0)
+ return rc;
+ }
+
+ nsend = min(fsg->usb_amount_left, (u32) mod_data.buflen);
+ memset(bh->buf + nkeep, 0, nsend - nkeep);
+ bh->inreq->length = nsend;
+ bh->inreq->zero = 0;
+ start_transfer(fsg, fsg->bulk_in, bh->inreq,
+ &bh->inreq_busy, &bh->state);
+ bh = fsg->next_buffhd_to_fill = bh->next;
+ fsg->usb_amount_left -= nsend;
+ nkeep = 0;
+ }
+ return 0;
+}
+
+static int throw_away_data(struct fsg_dev *fsg)
+{
+ struct fsg_buffhd *bh;
+ u32 amount;
+ int rc;
+
+ 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) {
+ 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) mod_data.buflen);
+
+ /* 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 */
+ if ((rc = sleep_thread(fsg)) != 0)
+ 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
+
+ /* If we don't know whether the host wants to read or write,
+ * this must be CB or CBI with an unknown command. We mustn't
+ * try to send or receive any data. So stall both bulk pipes
+ * if we can and wait for a reset. */
+ case DATA_DIR_UNKNOWN:
+ if (mod_data.can_stall) {
+ fsg_set_halt(fsg, fsg->bulk_out);
+ rc = halt_bulk_in_endpoint(fsg);
+ }
+ 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) {
+ bh->inreq->zero = 0;
+ start_transfer(fsg, fsg->bulk_in, bh->inreq,
+ &bh->inreq_busy, &bh->state);
+ fsg->next_buffhd_to_fill = bh->next;
+ }
+
+ /* There is a residue. For CB and CBI, simply mark the end
+ * of the data with a short packet. However, if we are
+ * allowed to stall, there was no data at all (residue ==
+ * data_size), and the command failed (invalid LUN or
+ * sense data is set), then halt the bulk-in endpoint
+ * instead. */
+ else if (!transport_is_bbb()) {
+ if (mod_data.can_stall &&
+ fsg->residue == fsg->data_size &&
+ (!fsg->curlun || fsg->curlun->sense_data != SS_NO_SENSE)) {
+ bh->state = BUF_STATE_EMPTY;
+ rc = halt_bulk_in_endpoint(fsg);
+ } else {
+ bh->inreq->zero = 1;
+ start_transfer(fsg, fsg->bulk_in, bh->inreq,
+ &bh->inreq_busy, &bh->state);
+ fsg->next_buffhd_to_fill = bh->next;
+ }
+ }
+
+ /* For Bulk-only, if we're allowed to stall then send the
+ * short packet and halt the bulk-in endpoint. If we can't
+ * stall, pad out the remaining data with 0's. */
+ else {
+ if (mod_data.can_stall) {
+ bh->inreq->zero = 1;
+ start_transfer(fsg, fsg->bulk_in, bh->inreq,
+ &bh->inreq_busy, &bh->state);
+ fsg->next_buffhd_to_fill = bh->next;
+ rc = halt_bulk_in_endpoint(fsg);
+ } else
+ rc = pad_with_zeros(fsg);
+ }
+ 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
+ else if (mod_data.can_stall) {
+ 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;
+
+ /* Wait for the next buffer to become available */
+ bh = fsg->next_buffhd_to_fill;
+ while (bh->state != BUF_STATE_EMPTY) {
+ if ((rc = sleep_thread(fsg)) != 0)
+ 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);
+ }
+
+ if (transport_is_bbb()) {
+ struct bulk_cs_wrap *csw = (struct bulk_cs_wrap *) 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;
+ bh->inreq->zero = 0;
+ start_transfer(fsg, fsg->bulk_in, bh->inreq,
+ &bh->inreq_busy, &bh->state);
+
+ } else if (mod_data.transport_type == USB_PR_CB) {
+
+ /* Control-Bulk transport has no status phase! */
+ return 0;
+
+ } else { // USB_PR_CBI
+ struct interrupt_data *buf = (struct interrupt_data *)
+ bh->buf;
+
+ /* Store and send the Interrupt data. UFI sends the ASC
+ * and ASCQ bytes. Everything else sends a Type (which
+ * is always 0) and the status Value. */
+ if (mod_data.protocol_type == USB_SC_UFI) {
+ buf->bType = ASC(sd);
+ buf->bValue = ASCQ(sd);
+ } else {
+ buf->bType = 0;
+ buf->bValue = status;
+ }
+ fsg->intreq->length = CBI_INTERRUPT_DATA_LEN;
+
+ fsg->intr_buffhd = bh; // Point to the right buffhd
+ fsg->intreq->buf = bh->inreq->buf;
+ fsg->intreq->dma = bh->inreq->dma;
+ fsg->intreq->context = bh;
+ start_transfer(fsg, fsg->intr_in, fsg->intreq,
+ &fsg->intreq_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;
+
+ /* Adjust the expected cmnd_size for protocol encapsulation padding.
+ * Transparent SCSI doesn't pad. */
+ if (protocol_is_scsi())
+ ;
+
+ /* There's some disagreement as to whether RBC pads commands or not.
+ * We'll play it safe and accept either form. */
+ else if (mod_data.protocol_type == USB_SC_RBC) {
+ if (fsg->cmnd_size == 12)
+ cmnd_size = 12;
+
+ /* All the other protocols pad to 12 bytes */
+ } else
+ cmnd_size = 12;
+
+ 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. */
+ 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;
+ 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 oonsistent */
+ if (transport_is_bbb()) {
+ if (fsg->lun != lun)
+ DBG(fsg, "using LUN %d from CBW, "
+ "not LUN %d from CDB\n",
+ fsg->lun, lun);
+ } else
+ fsg->lun = lun; // Use LUN from the command
+
+ /* 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;
+ }
+ } 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;
+ 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;
+ 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) {
+ if ((rc = sleep_thread(fsg)) != 0)
+ 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);
+
+ 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 = (struct bulk_cb_wrap *) 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));
+
+ /* The Bulk-only spec says we MUST stall the bulk pipes!
+ * If we want to avoid stalls, set a flag so that we will
+ * clear the endpoint halts at the next reset. */
+ if (!mod_data.can_stall)
+ set_bit(CLEAR_BULK_HALTS, &fsg->atomic_bitflags);
+ fsg_set_halt(fsg, fsg->bulk_out);
+ halt_bulk_in_endpoint(fsg);
+ return -EINVAL;
+ }
+
+ /* Is the CBW meaningful? */
+ if (cbw->Lun >= MAX_LUNS || cbw->Flags & ~USB_BULK_IN_FLAG ||
+ cbw->Length < 6 || cbw->Length > MAX_COMMAND_SIZE) {
+ DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, "
+ "cmdlen %u\n",
+ cbw->Lun, cbw->Flags, cbw->Length);
+
+ /* We can do anything we want here, so let's stall the
+ * bulk pipes if we are allowed to. */
+ if (mod_data.can_stall) {
+ fsg_set_halt(fsg, fsg->bulk_out);
+ halt_bulk_in_endpoint(fsg);
+ }
+ 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;
+
+ if (transport_is_bbb()) {
+
+ /* Wait for the next buffer to become available */
+ bh = fsg->next_buffhd_to_fill;
+ while (bh->state != BUF_STATE_EMPTY) {
+ if ((rc = sleep_thread(fsg)) != 0)
+ 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) {
+ if ((rc = sleep_thread(fsg)) != 0)
+ return rc;
+ }
+ rc = received_cbw(fsg, bh);
+ bh->state = BUF_STATE_EMPTY;
+
+ } else { // USB_PR_CB or USB_PR_CBI
+
+ /* Wait for the next command to arrive */
+ while (fsg->cbbuf_cmnd_size == 0) {
+ if ((rc = sleep_thread(fsg)) != 0)
+ return rc;
+ }
+
+ /* Is the previous status interrupt request still busy?
+ * The host is allowed to skip reading the status,
+ * so we must cancel it. */
+ if (fsg->intreq_busy)
+ usb_ep_dequeue(fsg->intr_in, fsg->intreq);
+
+ /* Copy the command and mark the buffer empty */
+ fsg->data_dir = DATA_DIR_UNKNOWN;
+ spin_lock_irq(&fsg->lock);
+ fsg->cmnd_size = fsg->cbbuf_cmnd_size;
+ memcpy(fsg->cmnd, fsg->cbbuf_cmnd, fsg->cmnd_size);
+ fsg->cbbuf_cmnd_size = 0;
+ spin_unlock_irq(&fsg->lock);
+ }
+ return rc;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+static int enable_endpoint(struct fsg_dev *fsg, struct usb_ep *ep,
+ const struct usb_endpoint_descriptor *d)
+{
+ int rc;
+
+ 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)
+{
+ 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;
+ }
+ }
+ if (fsg->intreq) {
+ usb_ep_free_request(fsg->intr_in, fsg->intreq);
+ fsg->intreq = NULL;
+ }
+
+ /* Disable the endpoints */
+ if (fsg->bulk_in_enabled) {
+ usb_ep_disable(fsg->bulk_in);
+ fsg->bulk_in_enabled = 0;
+ }
+ if (fsg->bulk_out_enabled) {
+ usb_ep_disable(fsg->bulk_out);
+ fsg->bulk_out_enabled = 0;
+ }
+ if (fsg->intr_in_enabled) {
+ usb_ep_disable(fsg->intr_in);
+ fsg->intr_in_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(fsg->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(fsg->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);
+
+ if (transport_is_cbi()) {
+ d = ep_desc(fsg->gadget, &fs_intr_in_desc, &hs_intr_in_desc);
+ if ((rc = enable_endpoint(fsg, fsg->intr_in, d)) != 0)
+ goto reset;
+ fsg->intr_in_enabled = 1;
+ }
+
+ /* Allocate the requests */
+ for (i = 0; i < NUM_BUFFERS; ++i) {
+ struct fsg_buffhd *bh = &fsg->buffhds[i];
+
+ if ((rc = alloc_request(fsg, fsg->bulk_in, &bh->inreq)) != 0)
+ goto reset;
+ if ((rc = alloc_request(fsg, fsg->bulk_out, &bh->outreq)) != 0)
+ goto reset;
+ bh->inreq->buf = bh->outreq->buf = bh->buf;
+ bh->inreq->dma = bh->outreq->dma = bh->dma;
+ bh->inreq->context = bh->outreq->context = bh;
+ bh->inreq->complete = bulk_in_complete;
+ bh->outreq->complete = bulk_out_complete;
+ }
+ if (transport_is_cbi()) {
+ if ((rc = alloc_request(fsg, fsg->intr_in, &fsg->intreq)) != 0)
+ goto reset;
+ fsg->intreq->complete = intr_in_complete;
+ }
+
+ fsg->running = 1;
+ for (i = 0; i < fsg->nluns; ++i)
+ fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
+ return rc;
+}
+
+
+/*
+ * 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;
+
+ /* 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;
+ if ((rc = do_set_interface(fsg, 0)) != 0)
+ fsg->config = 0; // Reset on errors
+ else {
+ char *speed;
+
+ switch (fsg->gadget->speed) {
+ case USB_SPEED_LOW: speed = "low"; break;
+ case USB_SPEED_FULL: speed = "full"; break;
+ case USB_SPEED_HIGH: speed = "high"; break;
+ default: speed = "?"; break;
+ }
+ INFO(fsg, "%s speed config #%d\n", speed, fsg->config);
+ }
+ }
+ return rc;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+static void handle_exception(struct fsg_dev *fsg)
+{
+ siginfo_t info;
+ int sig;
+ int i;
+ int num_active;
+ struct fsg_buffhd *bh;
+ enum fsg_state old_state;
+ u8 new_config;
+ struct lun *curlun;
+ unsigned int exception_req_tag;
+ int rc;
+
+ /* Clear the existing signals. Anything but SIGUSR1 is converted
+ * into a high-priority EXIT exception. */
+ for (;;) {
+ sig = dequeue_signal_lock(current, &fsg->thread_signal_mask,
+ &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);
+ }
+ }
+
+ /* Cancel all the pending transfers */
+ if (fsg->intreq_busy)
+ usb_ep_dequeue(fsg->intr_in, fsg->intreq);
+ for (i = 0; i < NUM_BUFFERS; ++i) {
+ bh = &fsg->buffhds[i];
+ if (bh->inreq_busy)
+ usb_ep_dequeue(fsg->bulk_in, bh->inreq);
+ if (bh->outreq_busy)
+ usb_ep_dequeue(fsg->bulk_out, bh->outreq);
+ }
+
+ /* Wait until everything is idle */
+ for (;;) {
+ num_active = fsg->intreq_busy;
+ for (i = 0; i < NUM_BUFFERS; ++i) {
+ bh = &fsg->buffhds[i];
+ num_active += bh->inreq_busy + bh->outreq_busy;
+ }
+ if (num_active == 0)
+ break;
+ if (sleep_thread(fsg))
+ return;
+ }
+
+ /* 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);
+ if (fsg->intr_in_enabled)
+ usb_ep_fifo_flush(fsg->intr_in);
+
+ /* 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];
+
+ exception_req_tag = fsg->exception_req_tag;
+ 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;
+ }
+ 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:
+ send_status(fsg);
+ 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:
+ /* In case we were forced against our will to halt a
+ * bulk endpoint, clear the halt now. (The SuperH UDC
+ * requires this.) */
+ if (test_and_clear_bit(CLEAR_BULK_HALTS,
+ &fsg->atomic_bitflags)) {
+ usb_ep_clear_halt(fsg->bulk_in);
+ usb_ep_clear_halt(fsg->bulk_out);
+ }
+
+ if (transport_is_bbb()) {
+ if (fsg->ep0_req_tag == exception_req_tag)
+ ep0_queue(fsg); // Complete the status stage
+
+ } else if (transport_is_cbi())
+ send_status(fsg); // Status by interrupt pipe
+
+ /* Technically this should go here, but it would only be
+ * a waste of time. Ditto for the INTERFACE_CHANGE and
+ * CONFIG_CHANGE cases. */
+ // for (i = 0; i < fsg->nluns; ++i)
+ // fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
+ break;
+
+ case FSG_STATE_INTERFACE_CHANGE:
+ rc = do_set_interface(fsg, 0);
+ if (fsg->ep0_req_tag != exception_req_tag)
+ break;
+ if (rc != 0) // STALL on errors
+ fsg_set_halt(fsg, fsg->ep0);
+ else // Complete the status stage
+ ep0_queue(fsg);
+ break;
+
+ case FSG_STATE_CONFIG_CHANGE:
+ rc = do_set_config(fsg, new_config);
+ if (fsg->ep0_req_tag != exception_req_tag)
+ break;
+ if (rc != 0) // STALL on errors
+ fsg_set_halt(fsg, fsg->ep0);
+ else // Complete the status stage
+ ep0_queue(fsg);
+ break;
+
+ case FSG_STATE_DISCONNECT:
+ fsync_all(fsg);
+ do_set_config(fsg, 0); // Unconfigured state
+ 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 = (struct fsg_dev *) fsg_;
+
+ fsg->thread_task = current;
+
+ /* Release all our userspace resources */
+ daemonize("file-storage-gadget");
+
+ /* Allow the thread to be killed by a signal, but set the signal mask
+ * to block everything but INT, TERM, KILL, and USR1. */
+ siginitsetinv(&fsg->thread_signal_mask, sigmask(SIGINT) |
+ sigmask(SIGTERM) | sigmask(SIGKILL) |
+ sigmask(SIGUSR1));
+ sigprocmask(SIG_SETMASK, &fsg->thread_signal_mask, NULL);
+
+ /* 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());
+
+ /* Wait for the gadget registration to finish up */
+ wait_for_completion(&fsg->thread_notifier);
+
+ /* 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);
+ }
+
+ fsg->thread_task = NULL;
+ flush_signals(current);
+
+ /* 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)) {
+ usb_gadget_unregister_driver(&fsg_driver);
+ 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 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_dentry)
+ inode = filp->f_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\n", filename);
+ rc = 0;
+
+out:
+ filp_close(filp, current->files);
+ return rc;
+}
+
+
+static void close_backing_file(struct lun *curlun)
+{
+ if (curlun->filp) {
+ LDBG(curlun, "close backing file\n");
+ fput(curlun->filp);
+ curlun->filp = NULL;
+ }
+}
+
+static void close_all_backing_files(struct fsg_dev *fsg)
+{
+ int i;
+
+ for (i = 0; i < fsg->nluns; ++i)
+ close_backing_file(&fsg->luns[i]);
+}
+
+
+static ssize_t show_ro(struct device *dev, char *buf)
+{
+ struct lun *curlun = dev_to_lun(dev);
+
+ return sprintf(buf, "%d\n", curlun->ro);
+}
+
+static ssize_t show_file(struct device *dev, char *buf)
+{
+ struct lun *curlun = dev_to_lun(dev);
+ struct fsg_dev *fsg = (struct fsg_dev *) 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_dentry, curlun->filp->f_vfsmnt,
+ 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_ro(struct device *dev, const char *buf, size_t count)
+{
+ ssize_t rc = count;
+ struct lun *curlun = dev_to_lun(dev);
+ struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev);
+ int i;
+
+ if (sscanf(buf, "%d", &i) != 1)
+ return -EINVAL;
+
+ /* Allow the write-enable status to change only while the backing file
+ * is closed. */
+ down_read(&fsg->filesem);
+ if (backing_file_is_open(curlun)) {
+ LDBG(curlun, "read-only status change prevented\n");
+ rc = -EBUSY;
+ } else {
+ curlun->ro = !!i;
+ LDBG(curlun, "read-only status set to %d\n", curlun->ro);
+ }
+ up_read(&fsg->filesem);
+ return rc;
+}
+
+static ssize_t store_file(struct device *dev, const char *buf, size_t count)
+{
+ struct lun *curlun = dev_to_lun(dev);
+ struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev);
+ int rc = 0;
+
+ if (curlun->prevent_medium_removal && backing_file_is_open(curlun)) {
+ LDBG(curlun, "eject attempt prevented\n");
+ return -EBUSY; // "Door is locked"
+ }
+
+ /* Remove a trailing newline */
+ if (count > 0 && buf[count-1] == '\n')
+ ((char *) buf)[count-1] = 0; // Ugh!
+
+ /* Eject current medium */
+ down_write(&fsg->filesem);
+ if (backing_file_is_open(curlun)) {
+ close_backing_file(curlun);
+ curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT;
+ }
+
+ /* Load new medium */
+ if (count > 0 && buf[0]) {
+ rc = open_backing_file(curlun, buf);
+ if (rc == 0)
+ curlun->unit_attention_data =
+ SS_NOT_READY_TO_READY_TRANSITION;
+ }
+ up_write(&fsg->filesem);
+ return (rc < 0 ? rc : count);
+}
+
+
+/* The write permissions and store_xxx pointers are set in fsg_bind() */
+static DEVICE_ATTR(ro, 0444, show_ro, NULL);
+static DEVICE_ATTR(file, 0444, show_file, NULL);
+
+
+/*-------------------------------------------------------------------------*/
+
+static void lun_release(struct device *dev)
+{
+ struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev);
+
+ complete(&fsg->lun_released);
+}
+
+static void fsg_unbind(struct usb_gadget *gadget)
+{
+ struct fsg_dev *fsg = get_gadget_data(gadget);
+ int i;
+ struct lun *curlun;
+ struct usb_request *req = fsg->ep0req;
+
+ DBG(fsg, "unbind\n");
+ clear_bit(REGISTERED, &fsg->atomic_bitflags);
+
+ /* Unregister the sysfs attribute files and the LUNs */
+ init_completion(&fsg->lun_released);
+ for (i = 0; i < fsg->nluns; ++i) {
+ curlun = &fsg->luns[i];
+ if (curlun->registered) {
+ device_remove_file(&curlun->dev, &dev_attr_ro);
+ device_remove_file(&curlun->dev, &dev_attr_file);
+ device_unregister(&curlun->dev);
+ wait_for_completion(&fsg->lun_released);
+ 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) {
+ struct fsg_buffhd *bh = &fsg->buffhds[i];
+
+ if (bh->buf)
+ usb_ep_free_buffer(fsg->bulk_in, bh->buf, bh->dma,
+ mod_data.buflen);
+ }
+
+ /* Free the request and buffer for endpoint 0 */
+ if (req) {
+ if (req->buf)
+ usb_ep_free_buffer(fsg->ep0, req->buf,
+ req->dma, EP0_BUFSIZE);
+ usb_ep_free_request(fsg->ep0, req);
+ }
+
+ set_gadget_data(gadget, NULL);
+}
+
+
+static int __init check_parameters(struct fsg_dev *fsg)
+{
+ int prot;
+
+ /* Store the default values */
+ mod_data.transport_type = USB_PR_BULK;
+ mod_data.transport_name = "Bulk-only";
+ mod_data.protocol_type = USB_SC_SCSI;
+ mod_data.protocol_name = "Transparent SCSI";
+
+ if (gadget_is_sh(fsg->gadget))
+ mod_data.can_stall = 0;
+
+ if (mod_data.release == 0xffff) { // Parameter wasn't set
+ if (gadget_is_net2280(fsg->gadget))
+ mod_data.release = 0x0301;
+ else if (gadget_is_dummy(fsg->gadget))
+ mod_data.release = 0x0302;
+ else if (gadget_is_pxa(fsg->gadget))
+ mod_data.release = 0x0303;
+ else if (gadget_is_sh(fsg->gadget))
+ mod_data.release = 0x0304;
+
+ /* The sa1100 controller is not supported */
+
+ else if (gadget_is_goku(fsg->gadget))
+ mod_data.release = 0x0306;
+ else if (gadget_is_mq11xx(fsg->gadget))
+ mod_data.release = 0x0307;
+ else if (gadget_is_omap(fsg->gadget))
+ mod_data.release = 0x0308;
+ else if (gadget_is_lh7a40x(fsg->gadget))
+ mod_data.release = 0x0309;
+ else if (gadget_is_n9604(fsg->gadget))
+ mod_data.release = 0x0310;
+ else if (gadget_is_pxa27x(fsg->gadget))
+ mod_data.release = 0x0311;
+ else if (gadget_is_s3c2410(gadget))
+ mod_data.release = 0x0312;
+ else if (gadget_is_at91(fsg->gadget))
+ mod_data.release = 0x0313;
+ else {
+ WARN(fsg, "controller '%s' not recognized\n",
+ fsg->gadget->name);
+ mod_data.release = 0x0399;
+ }
+ }
+
+ prot = simple_strtol(mod_data.protocol_parm, NULL, 0);
+
+#ifdef CONFIG_USB_FILE_STORAGE_TEST
+ if (strnicmp(mod_data.transport_parm, "BBB", 10) == 0) {
+ ; // Use default setting
+ } else if (strnicmp(mod_data.transport_parm, "CB", 10) == 0) {
+ mod_data.transport_type = USB_PR_CB;
+ mod_data.transport_name = "Control-Bulk";
+ } else if (strnicmp(mod_data.transport_parm, "CBI", 10) == 0) {
+ mod_data.transport_type = USB_PR_CBI;
+ mod_data.transport_name = "Control-Bulk-Interrupt";
+ } else {
+ ERROR(fsg, "invalid transport: %s\n", mod_data.transport_parm);
+ return -EINVAL;
+ }
+
+ if (strnicmp(mod_data.protocol_parm, "SCSI", 10) == 0 ||
+ prot == USB_SC_SCSI) {
+ ; // Use default setting
+ } else if (strnicmp(mod_data.protocol_parm, "RBC", 10) == 0 ||
+ prot == USB_SC_RBC) {
+ mod_data.protocol_type = USB_SC_RBC;
+ mod_data.protocol_name = "RBC";
+ } else if (strnicmp(mod_data.protocol_parm, "8020", 4) == 0 ||
+ strnicmp(mod_data.protocol_parm, "ATAPI", 10) == 0 ||
+ prot == USB_SC_8020) {
+ mod_data.protocol_type = USB_SC_8020;
+ mod_data.protocol_name = "8020i (ATAPI)";
+ } else if (strnicmp(mod_data.protocol_parm, "QIC", 3) == 0 ||
+ prot == USB_SC_QIC) {
+ mod_data.protocol_type = USB_SC_QIC;
+ mod_data.protocol_name = "QIC-157";
+ } else if (strnicmp(mod_data.protocol_parm, "UFI", 10) == 0 ||
+ prot == USB_SC_UFI) {
+ mod_data.protocol_type = USB_SC_UFI;
+ mod_data.protocol_name = "UFI";
+ } else if (strnicmp(mod_data.protocol_parm, "8070", 4) == 0 ||
+ prot == USB_SC_8070) {
+ mod_data.protocol_type = USB_SC_8070;
+ mod_data.protocol_name = "8070i";
+ } else {
+ ERROR(fsg, "invalid protocol: %s\n", mod_data.protocol_parm);
+ return -EINVAL;
+ }
+
+ mod_data.buflen &= PAGE_CACHE_MASK;
+ if (mod_data.buflen <= 0) {
+ ERROR(fsg, "invalid buflen\n");
+ return -ETOOSMALL;
+ }
+#endif /* CONFIG_USB_FILE_STORAGE_TEST */
+
+ return 0;
+}
+
+
+static int __init fsg_bind(struct usb_gadget *gadget)
+{
+ struct fsg_dev *fsg = the_fsg;
+ int rc;
+ int i;
+ struct lun *curlun;
+ struct usb_ep *ep;
+ struct usb_request *req;
+ char *pathbuf, *p;
+
+ fsg->gadget = gadget;
+ set_gadget_data(gadget, fsg);
+ fsg->ep0 = gadget->ep0;
+ fsg->ep0->driver_data = fsg;
+
+ if ((rc = check_parameters(fsg)) != 0)
+ goto out;
+
+ if (mod_data.removable) { // Enable the store_xxx attributes
+ dev_attr_ro.attr.mode = dev_attr_file.attr.mode = 0644;
+ dev_attr_ro.store = store_ro;
+ dev_attr_file.store = store_file;
+ }
+
+ /* Find out how many LUNs there should be */
+ i = mod_data.nluns;
+ if (i == 0)
+ i = max(mod_data.num_filenames, 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 = kmalloc(i * sizeof(struct lun), GFP_KERNEL);
+ if (!fsg->luns) {
+ rc = -ENOMEM;
+ goto out;
+ }
+ memset(fsg->luns, 0, i * sizeof(struct lun));
+ fsg->nluns = i;
+
+ for (i = 0; i < fsg->nluns; ++i) {
+ curlun = &fsg->luns[i];
+ curlun->ro = ro[i];
+ curlun->dev.parent = &gadget->dev;
+ curlun->dev.driver = &fsg_driver.driver;
+ dev_set_drvdata(&curlun->dev, fsg);
+ snprintf(curlun->dev.bus_id, BUS_ID_SIZE,
+ "%s-lun%d", gadget->dev.bus_id, i);
+
+ if ((rc = device_register(&curlun->dev)) != 0)
+ INFO(fsg, "failed to register LUN%d: %d\n", i, rc);
+ else {
+ curlun->registered = 1;
+ curlun->dev.release = lun_release;
+ device_create_file(&curlun->dev, &dev_attr_ro);
+ device_create_file(&curlun->dev, &dev_attr_file);
+ }
+
+ if (file[i] && *file[i]) {
+ if ((rc = open_backing_file(curlun, file[i])) != 0)
+ goto out;
+ } else if (!mod_data.removable) {
+ ERROR(fsg, "no file given for LUN%d\n", i);
+ rc = -EINVAL;
+ goto out;
+ }
+ }
+
+ /* Find all the endpoints we will use */
+ usb_ep_autoconfig_reset(gadget);
+ ep = usb_ep_autoconfig(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(gadget, &fs_bulk_out_desc);
+ if (!ep)
+ goto autoconf_fail;
+ ep->driver_data = fsg; // claim the endpoint
+ fsg->bulk_out = ep;
+
+ if (transport_is_cbi()) {
+ ep = usb_ep_autoconfig(gadget, &fs_intr_in_desc);
+ if (!ep)
+ goto autoconf_fail;
+ ep->driver_data = fsg; // claim the endpoint
+ fsg->intr_in = ep;
+ }
+
+ /* Fix up the descriptors */
+ device_desc.bMaxPacketSize0 = fsg->ep0->maxpacket;
+ device_desc.idVendor = cpu_to_le16(mod_data.vendor);
+ device_desc.idProduct = cpu_to_le16(mod_data.product);
+ device_desc.bcdDevice = cpu_to_le16(mod_data.release);
+
+ i = (transport_is_cbi() ? 3 : 2); // Number of endpoints
+ intf_desc.bNumEndpoints = i;
+ intf_desc.bInterfaceSubClass = mod_data.protocol_type;
+ intf_desc.bInterfaceProtocol = mod_data.transport_type;
+ fs_function[i + FS_FUNCTION_PRE_EP_ENTRIES] = NULL;
+
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+ hs_function[i + HS_FUNCTION_PRE_EP_ENTRIES] = NULL;
+
+ /* Assume ep0 uses the same maxpacket value for both speeds */
+ dev_qualifier.bMaxPacketSize0 = fsg->ep0->maxpacket;
+
+ /* Assume that all 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;
+ hs_intr_in_desc.bEndpointAddress = fs_intr_in_desc.bEndpointAddress;
+#endif
+
+ if (gadget->is_otg) {
+ otg_desc.bmAttributes |= USB_OTG_HNP,
+ config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+ }
+
+ rc = -ENOMEM;
+
+ /* Allocate the request and buffer for endpoint 0 */
+ fsg->ep0req = req = usb_ep_alloc_request(fsg->ep0, GFP_KERNEL);
+ if (!req)
+ goto out;
+ req->buf = usb_ep_alloc_buffer(fsg->ep0, EP0_BUFSIZE,
+ &req->dma, GFP_KERNEL);
+ if (!req->buf)
+ goto out;
+ req->complete = ep0_complete;
+
+ /* Allocate the data buffers */
+ for (i = 0; i < NUM_BUFFERS; ++i) {
+ struct fsg_buffhd *bh = &fsg->buffhds[i];
+
+ bh->buf = usb_ep_alloc_buffer(fsg->bulk_in, mod_data.buflen,
+ &bh->dma, GFP_KERNEL);
+ if (!bh->buf)
+ goto out;
+ bh->next = bh + 1;
+ }
+ fsg->buffhds[NUM_BUFFERS - 1].next = &fsg->buffhds[0];
+
+ /* This should reflect the actual gadget power source */
+ usb_gadget_set_selfpowered(gadget);
+
+ snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
+ system_utsname.sysname, system_utsname.release,
+ gadget->name);
+
+ /* On a real device, serial[] would be loaded from permanent
+ * storage. We just encode it from the driver version string. */
+ for (i = 0; i < sizeof(serial) - 2; i += 2) {
+ unsigned char c = DRIVER_VERSION[i / 2];
+
+ if (!c)
+ break;
+ sprintf(&serial[i], "%02X", c);
+ }
+
+ if ((rc = kernel_thread(fsg_main_thread, fsg, (CLONE_VM | CLONE_FS |
+ CLONE_FILES))) < 0)
+ goto out;
+ fsg->thread_pid = rc;
+
+ INFO(fsg, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
+ 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_dentry,
+ curlun->filp->f_vfsmnt,
+ pathbuf, PATH_MAX);
+ if (IS_ERR(p))
+ p = NULL;
+ }
+ LINFO(curlun, "ro=%d, file: %s\n",
+ curlun->ro, (p ? p : "(error)"));
+ }
+ }
+ kfree(pathbuf);
+
+ DBG(fsg, "transport=%s (x%02x)\n",
+ mod_data.transport_name, mod_data.transport_type);
+ DBG(fsg, "protocol=%s (x%02x)\n",
+ mod_data.protocol_name, mod_data.protocol_type);
+ DBG(fsg, "VendorID=x%04x, ProductID=x%04x, Release=x%04x\n",
+ mod_data.vendor, mod_data.product, mod_data.release);
+ DBG(fsg, "removable=%d, stall=%d, buflen=%u\n",
+ mod_data.removable, mod_data.can_stall,
+ mod_data.buflen);
+ DBG(fsg, "I/O thread pid: %d\n", fsg->thread_pid);
+ return 0;
+
+autoconf_fail:
+ ERROR(fsg, "unable to autoconfigure all endpoints\n");
+ rc = -ENOTSUPP;
+
+out:
+ fsg->state = FSG_STATE_TERMINATED; // The thread is dead
+ fsg_unbind(gadget);
+ close_all_backing_files(fsg);
+ return rc;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+static void fsg_suspend(struct usb_gadget *gadget)
+{
+ struct fsg_dev *fsg = get_gadget_data(gadget);
+
+ DBG(fsg, "suspend\n");
+ set_bit(SUSPENDED, &fsg->atomic_bitflags);
+}
+
+static void fsg_resume(struct usb_gadget *gadget)
+{
+ struct fsg_dev *fsg = get_gadget_data(gadget);
+
+ DBG(fsg, "resume\n");
+ clear_bit(SUSPENDED, &fsg->atomic_bitflags);
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+static struct usb_gadget_driver fsg_driver = {
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+ .speed = USB_SPEED_HIGH,
+#else
+ .speed = USB_SPEED_FULL,
+#endif
+ .function = (char *) longname,
+ .bind = fsg_bind,
+ .unbind = fsg_unbind,
+ .disconnect = fsg_disconnect,
+ .setup = fsg_setup,
+ .suspend = fsg_suspend,
+ .resume = fsg_resume,
+
+ .driver = {
+ .name = (char *) shortname,
+ // .release = ...
+ // .suspend = ...
+ // .resume = ...
+ },
+};
+
+
+static int __init fsg_alloc(void)
+{
+ struct fsg_dev *fsg;
+
+ fsg = kmalloc(sizeof *fsg, GFP_KERNEL);
+ if (!fsg)
+ return -ENOMEM;
+ memset(fsg, 0, sizeof *fsg);
+ spin_lock_init(&fsg->lock);
+ init_rwsem(&fsg->filesem);
+ init_waitqueue_head(&fsg->thread_wqh);
+ init_completion(&fsg->thread_notifier);
+
+ the_fsg = fsg;
+ return 0;
+}
+
+
+static void fsg_free(struct fsg_dev *fsg)
+{
+ kfree(fsg->luns);
+ kfree(fsg);
+}
+
+
+static int __init fsg_init(void)
+{
+ int rc;
+ struct fsg_dev *fsg;
+
+ if ((rc = fsg_alloc()) != 0)
+ return rc;
+ fsg = the_fsg;
+ if ((rc = usb_gadget_register_driver(&fsg_driver)) != 0) {
+ fsg_free(fsg);
+ return rc;
+ }
+ set_bit(REGISTERED, &fsg->atomic_bitflags);
+
+ /* Tell the thread to start working */
+ complete(&fsg->thread_notifier);
+ return 0;
+}
+module_init(fsg_init);
+
+
+static void __exit fsg_cleanup(void)
+{
+ struct fsg_dev *fsg = the_fsg;
+
+ /* Unregister the driver iff the thread hasn't already done so */
+ if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags))
+ usb_gadget_unregister_driver(&fsg_driver);
+
+ /* Wait for the thread to finish up */
+ wait_for_completion(&fsg->thread_notifier);
+
+ close_all_backing_files(fsg);
+ fsg_free(fsg);
+}
+module_exit(fsg_cleanup);