You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
4138 lines
114 KiB
4138 lines
114 KiB
/*
|
|
* 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;
|
|
try_to_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, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct lun *curlun = dev_to_lun(dev);
|
|
|
|
return sprintf(buf, "%d\n", curlun->ro);
|
|
}
|
|
|
|
static ssize_t show_file(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct lun *curlun = dev_to_lun(dev);
|
|
struct fsg_dev *fsg = (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, struct device_attribute *attr, 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, struct device_attribute *attr, 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);
|
|
|