+++ /dev/null
-/*
- * file_storage.c -- File-backed USB Storage Gadget, for USB development
- *
- * Copyright (C) 2003-2008 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 or as a CD-ROM 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. (For CD-ROM emulation,
- * access is always read-only.) 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, release number and serial 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. Ideally
- * each LUN would be settable independently as a disk drive or a CD-ROM
- * drive, but currently all LUNs have to be the same type. The CD-ROM
- * emulation includes a single data track and no audio tracks; hence there
- * need be only one backing file per LUN.
- *
- * 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.
- *
- * Note that the driver is slightly non-portable in that it assumes a
- * single memory/DMA buffer will be useable for bulk-in, bulk-out, and
- * interrupt-in endpoints. With most device controllers this isn't an
- * issue, but there may be some with hardware restrictions that prevent
- * a buffer from being used by more than one endpoint.
- *
- * Module options:
- *
- * file=filename[,filename...]
- * Required if "removable" is not set, names of
- * the files or block devices used for
- * backing storage
- * serial=HHHH... Required serial number (string of hex chars)
- * 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
- * nofua=b[,b...] Default false, booleans for ignore FUA flag
- * in SCSI WRITE(10,12) commands
- * stall Default determined according to the type of
- * USB device controller (usually true),
- * boolean to permit the driver to halt
- * bulk endpoints
- * cdrom Default false, boolean for whether to emulate
- * a CD-ROM drive
- * 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)
- *
- * If CONFIG_USB_FILE_STORAGE_TEST is not set, only the "file", "serial", "ro",
- * "removable", "luns", "nofua", "stall", and "cdrom" 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", "nofua", 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 or if CD-ROM emulation
- * is being used.
- *
- * This gadget driver is heavily based on "Gadget Zero" by David Brownell.
- * The driver's SCSI command interface was based on the "Information
- * technology - Small Computer System Interface - 2" document from
- * X3T9.2 Project 375D, Revision 10L, 7-SEP-93, available at
- * <http://www.t10.org/ftp/t10/drafts/s2/s2-r10l.pdf>. The single exception
- * is opcode 0x23 (READ FORMAT CAPACITIES), which was based on the
- * "Universal Serial Bus Mass Storage Class UFI Command Specification"
- * document, Revision 1.0, December 14, 1998, available at
- * <http://www.usb.org/developers/devclass_docs/usbmass-ufi10.pdf>.
- */
-
-
-/*
- * 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.
- */
-
-
-/* #define VERBOSE_DEBUG */
-/* #define DUMP_MSGS */
-
-
-#include <linux/blkdev.h>
-#include <linux/completion.h>
-#include <linux/dcache.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/fcntl.h>
-#include <linux/file.h>
-#include <linux/fs.h>
-#include <linux/kref.h>
-#include <linux/kthread.h>
-#include <linux/limits.h>
-#include <linux/module.h>
-#include <linux/rwsem.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/string.h>
-#include <linux/freezer.h>
-#include <linux/utsname.h>
-
-#include <linux/usb/composite.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 "1 September 2010"
-
-static char fsg_string_manufacturer[64];
-static const char fsg_string_product[] = DRIVER_DESC;
-static const char fsg_string_config[] = "Self-powered";
-static const char fsg_string_interface[] = "Mass Storage";
-
-
-#include "storage_common.c"
-
-
-MODULE_DESCRIPTION(DRIVER_DESC);
-MODULE_AUTHOR("Alan Stern");
-MODULE_LICENSE("Dual BSD/GPL");
-
-/*
- * 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.
- */
-
-
-/*-------------------------------------------------------------------------*/
-
-
-/* Encapsulate the module parameter settings */
-
-static struct {
- char *file[FSG_MAX_LUNS];
- char *serial;
- bool ro[FSG_MAX_LUNS];
- bool nofua[FSG_MAX_LUNS];
- unsigned int num_filenames;
- unsigned int num_ros;
- unsigned int num_nofuas;
- unsigned int nluns;
-
- bool removable;
- bool can_stall;
- bool cdrom;
-
- char *transport_parm;
- char *protocol_parm;
- unsigned short vendor;
- unsigned short product;
- unsigned short release;
- unsigned int buflen;
-
- int transport_type;
- char *transport_name;
- int protocol_type;
- char *protocol_name;
-
-} mod_data = { // Default values
- .transport_parm = "BBB",
- .protocol_parm = "SCSI",
- .removable = 0,
- .can_stall = 1,
- .cdrom = 0,
- .vendor = FSG_VENDOR_ID,
- .product = FSG_PRODUCT_ID,
- .release = 0xffff, // Use controller chip type
- .buflen = 16384,
- };
-
-
-module_param_array_named(file, mod_data.file, charp, &mod_data.num_filenames,
- S_IRUGO);
-MODULE_PARM_DESC(file, "names of backing files or devices");
-
-module_param_named(serial, mod_data.serial, charp, S_IRUGO);
-MODULE_PARM_DESC(serial, "USB serial number");
-
-module_param_array_named(ro, mod_data.ro, bool, &mod_data.num_ros, S_IRUGO);
-MODULE_PARM_DESC(ro, "true to force read-only");
-
-module_param_array_named(nofua, mod_data.nofua, bool, &mod_data.num_nofuas,
- S_IRUGO);
-MODULE_PARM_DESC(nofua, "true to ignore SCSI WRITE(10,12) FUA bit");
-
-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");
-
-module_param_named(stall, mod_data.can_stall, bool, S_IRUGO);
-MODULE_PARM_DESC(stall, "false to prevent bulk stalls");
-
-module_param_named(cdrom, mod_data.cdrom, bool, S_IRUGO);
-MODULE_PARM_DESC(cdrom, "true to emulate cdrom instead of disk");
-
-/* 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");
-
-#endif /* CONFIG_USB_FILE_STORAGE_TEST */
-
-
-/*
- * 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 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;
-
- /* reference counting: wait until all LUNs are released */
- struct kref ref;
-
- struct usb_ep *ep0; // Handy copy of gadget->ep0
- struct usb_request *ep0req; // For control responses
- unsigned int ep0_req_tag;
- const char *ep0req_name;
-
- struct usb_request *intreq; // For interrupt responses
- 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 IGNORE_BULK_OUT 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;
-
- int thread_wakeup_needed;
- struct completion thread_notifier;
- struct task_struct *thread_task;
-
- int cmnd_size;
- u8 cmnd[MAX_COMMAND_SIZE];
- enum data_direction data_dir;
- u32 data_size;
- u32 data_size_from_cmnd;
- u32 tag;
- unsigned int lun;
- u32 residue;
- u32 usb_amount_left;
-
- /* 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 fsg_lun *luns;
- struct fsg_lun *curlun;
- /* Must be the last entry */
- struct fsg_buffhd buffhds[];
-};
-
-typedef void (*fsg_routine_t)(struct fsg_dev *);
-
-static int exception_in_progress(struct fsg_dev *fsg)
-{
- return (fsg->state > FSG_STATE_IDLE);
-}
-
-/* Make bulk-out requests be divisible by the maxpacket size */
-static void set_bulk_out_req_length(struct fsg_dev *fsg,
- struct fsg_buffhd *bh, unsigned int length)
-{
- unsigned int rem;
-
- bh->bulk_out_intended_length = length;
- rem = length % fsg->bulk_out_maxpacket;
- if (rem > 0)
- length += fsg->bulk_out_maxpacket - rem;
- bh->outreq->length = length;
-}
-
-static struct fsg_dev *the_fsg;
-static struct usb_gadget_driver fsg_driver;
-
-
-/*-------------------------------------------------------------------------*/
-
-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);
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * DESCRIPTORS ... most are static, but strings and (full) configuration
- * descriptors are built on demand. Also the (static) config and interface
- * descriptors are adjusted during fsg_bind().
- */
-
-/* There is only one configuration. */
-#define CONFIG_VALUE 1
-
-static struct usb_device_descriptor
-device_desc = {
- .bLength = sizeof device_desc,
- .bDescriptorType = USB_DT_DEVICE,
-
- .bcdUSB = cpu_to_le16(0x0200),
- .bDeviceClass = USB_CLASS_PER_INTERFACE,
-
- /* The next three values can be overridden by module parameters */
- .idVendor = cpu_to_le16(FSG_VENDOR_ID),
- .idProduct = cpu_to_le16(FSG_PRODUCT_ID),
- .bcdDevice = cpu_to_le16(0xffff),
-
- .iManufacturer = FSG_STRING_MANUFACTURER,
- .iProduct = FSG_STRING_PRODUCT,
- .iSerialNumber = FSG_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 = FSG_STRING_CONFIG,
- .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
- .bMaxPower = CONFIG_USB_GADGET_VBUS_DRAW / 2,
-};
-
-
-static struct usb_qualifier_descriptor
-dev_qualifier = {
- .bLength = sizeof dev_qualifier,
- .bDescriptorType = USB_DT_DEVICE_QUALIFIER,
-
- .bcdUSB = cpu_to_le16(0x0200),
- .bDeviceClass = USB_CLASS_PER_INTERFACE,
-
- .bNumConfigurations = 1,
-};
-
-static int populate_bos(struct fsg_dev *fsg, u8 *buf)
-{
- memcpy(buf, &fsg_bos_desc, USB_DT_BOS_SIZE);
- buf += USB_DT_BOS_SIZE;
-
- memcpy(buf, &fsg_ext_cap_desc, USB_DT_USB_EXT_CAP_SIZE);
- buf += USB_DT_USB_EXT_CAP_SIZE;
-
- memcpy(buf, &fsg_ss_cap_desc, USB_DT_USB_SS_CAP_SIZE);
-
- return USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE
- + USB_DT_USB_EXT_CAP_SIZE;
-}
-
-/*
- * 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)
-{
- enum usb_device_speed speed = gadget->speed;
- int len;
- const struct usb_descriptor_header **function;
-
- if (index > 0)
- return -EINVAL;
-
- if (gadget_is_dualspeed(gadget) && type == USB_DT_OTHER_SPEED_CONFIG)
- speed = (USB_SPEED_FULL + USB_SPEED_HIGH) - speed;
- function = gadget_is_dualspeed(gadget) && speed == USB_SPEED_HIGH
- ? (const struct usb_descriptor_header **)fsg_hs_function
- : (const struct usb_descriptor_header **)fsg_fs_function;
-
- /* for now, don't advertise srp-only devices */
- if (!gadget_is_otg(gadget))
- 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 */
-
-/* Caller must hold fsg->lock */
-static void wakeup_thread(struct fsg_dev *fsg)
-{
- /* Tell the main thread that something has happened */
- fsg->thread_wakeup_needed = 1;
- if (fsg->thread_task)
- wake_up_process(fsg->thread_task);
-}
-
-
-static void raise_exception(struct fsg_dev *fsg, enum fsg_state new_state)
-{
- unsigned long flags;
-
- /* 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;
- if (fsg->thread_task)
- send_sig_info(SIGUSR1, SEND_SIG_FORCED,
- fsg->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 */
- WARNING(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 = 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", __func__,
- 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 = ep->driver_data;
- struct fsg_buffhd *bh = req->context;
-
- if (req->status || req->actual != req->length)
- DBG(fsg, "%s --> %d, %u/%u\n", __func__,
- req->status, req->actual, req->length);
- if (req->status == -ECONNRESET) // Request was cancelled
- usb_ep_fifo_flush(ep);
-
- /* Hold the lock while we update the request and buffer states */
- smp_wmb();
- spin_lock(&fsg->lock);
- bh->inreq_busy = 0;
- bh->state = BUF_STATE_EMPTY;
- wakeup_thread(fsg);
- spin_unlock(&fsg->lock);
-}
-
-static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req)
-{
- struct fsg_dev *fsg = ep->driver_data;
- struct fsg_buffhd *bh = req->context;
-
- dump_msg(fsg, "bulk-out", req->buf, req->actual);
- if (req->status || req->actual != bh->bulk_out_intended_length)
- DBG(fsg, "%s --> %d, %u/%u\n", __func__,
- req->status, req->actual,
- bh->bulk_out_intended_length);
- if (req->status == -ECONNRESET) // Request was cancelled
- usb_ep_fifo_flush(ep);
-
- /* Hold the lock while we update the request and buffer states */
- smp_wmb();
- spin_lock(&fsg->lock);
- bh->outreq_busy = 0;
- bh->state = BUF_STATE_FULL;
- wakeup_thread(fsg);
- spin_unlock(&fsg->lock);
-}
-
-
-#ifdef CONFIG_USB_FILE_STORAGE_TEST
-static void intr_in_complete(struct usb_ep *ep, struct usb_request *req)
-{
- struct fsg_dev *fsg = ep->driver_data;
- struct fsg_buffhd *bh = req->context;
-
- if (req->status || req->actual != req->length)
- DBG(fsg, "%s --> %d, %u/%u\n", __func__,
- req->status, req->actual, req->length);
- if (req->status == -ECONNRESET) // Request was cancelled
- usb_ep_fifo_flush(ep);
-
- /* Hold the lock while we update the request and buffer states */
- smp_wmb();
- spin_lock(&fsg->lock);
- fsg->intreq_busy = 0;
- bh->state = BUF_STATE_EMPTY;
- wakeup_thread(fsg);
- spin_unlock(&fsg->lock);
-}
-
-#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] = {
- 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)
- WARNING(fsg, "CB[I] overwriting previous command\n");
- fsg->cbbuf_cmnd_size = req->actual;
- memcpy(fsg->cbbuf_cmnd, req->buf, fsg->cbbuf_cmnd_size);
-
- wakeup_thread(fsg);
- spin_unlock(&fsg->lock);
-}
-
-#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 = le16_to_cpu(ctrl->wIndex);
- u16 w_value = le16_to_cpu(ctrl->wValue);
- u16 w_length = le16_to_cpu(ctrl->wLength);
-
- if (!fsg->config)
- return value;
-
- /* Handle Bulk-only class-specific requests */
- if (transport_is_bbb()) {
- switch (ctrl->bRequest) {
-
- case US_BULK_RESET_REQUEST:
- if (ctrl->bRequestType != (USB_DIR_OUT |
- USB_TYPE_CLASS | USB_RECIP_INTERFACE))
- break;
- if (w_index != 0 || w_value != 0 || w_length != 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 US_BULK_GET_MAX_LUN:
- if (ctrl->bRequestType != (USB_DIR_IN |
- USB_TYPE_CLASS | USB_RECIP_INTERFACE))
- break;
- if (w_index != 0 || w_value != 0 || w_length != 1) {
- value = -EDOM;
- break;
- }
- VDBG(fsg, "get max LUN\n");
- *(u8 *) req->buf = fsg->nluns - 1;
- value = 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 || w_value != 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,
- le16_to_cpu(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 = le16_to_cpu(ctrl->wIndex);
- u16 w_value = le16_to_cpu(ctrl->wValue);
-
- /* 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");
- device_desc.bMaxPacketSize0 = fsg->ep0->maxpacket;
- value = sizeof device_desc;
- memcpy(req->buf, &device_desc, value);
- break;
- case USB_DT_DEVICE_QUALIFIER:
- VDBG(fsg, "get device qualifier\n");
- if (!gadget_is_dualspeed(fsg->gadget) ||
- fsg->gadget->speed == USB_SPEED_SUPER)
- break;
- /*
- * Assume ep0 uses the same maxpacket value for both
- * speeds
- */
- dev_qualifier.bMaxPacketSize0 = fsg->ep0->maxpacket;
- value = 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 (!gadget_is_dualspeed(fsg->gadget) ||
- fsg->gadget->speed == USB_SPEED_SUPER)
- break;
- goto get_config;
- case USB_DT_CONFIG:
- VDBG(fsg, "get configuration descriptor\n");
-get_config:
- value = populate_config_buf(fsg->gadget,
- req->buf,
- w_value >> 8,
- w_value & 0xff);
- break;
-
- case USB_DT_STRING:
- VDBG(fsg, "get string descriptor\n");
-
- /* wIndex == language code */
- value = usb_gadget_get_string(&fsg_stringtab,
- w_value & 0xff, req->buf);
- break;
-
- case USB_DT_BOS:
- VDBG(fsg, "get bos descriptor\n");
-
- if (gadget_is_superspeed(fsg->gadget))
- value = populate_bos(fsg, req->buf);
- 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 = 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 = 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, le16_to_cpu(ctrl->wLength));
- }
-
- 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;
- int w_length = le16_to_cpu(ctrl->wLength);
-
- ++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) {
- rc = min(rc, w_length);
- fsg->ep0req->length = rc;
- fsg->ep0req->zero = rc < w_length;
- 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, int *pbusy,
- 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);
-
- spin_lock_irq(&fsg->lock);
- *pbusy = 1;
- *state = BUF_STATE_BUSY;
- spin_unlock_irq(&fsg->lock);
- rc = usb_ep_queue(ep, req, GFP_KERNEL);
- if (rc != 0) {
- *pbusy = 0;
- *state = BUF_STATE_EMPTY;
-
- /* We can't do much more than wait for a reset */
-
- /* Note: currently the net2280 driver fails zero-length
- * submissions if DMA is enabled. */
- if (rc != -ESHUTDOWN && !(rc == -EOPNOTSUPP &&
- req->length == 0))
- WARNING(fsg, "error in submission: %s --> %d\n",
- ep->name, rc);
- }
-}
-
-
-static int sleep_thread(struct fsg_dev *fsg)
-{
- int rc = 0;
-
- /* Wait until a signal arrives or we are woken up */
- for (;;) {
- try_to_freeze();
- set_current_state(TASK_INTERRUPTIBLE);
- if (signal_pending(current)) {
- rc = -EINTR;
- break;
- }
- if (fsg->thread_wakeup_needed)
- break;
- schedule();
- }
- __set_current_state(TASK_RUNNING);
- fsg->thread_wakeup_needed = 0;
- return rc;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static int do_read(struct fsg_dev *fsg)
-{
- struct fsg_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;
- ssize_t nread;
-
- /* Get the starting Logical Block Address and check that it's
- * not too big */
- if (fsg->cmnd[0] == READ_6)
- lba = get_unaligned_be24(&fsg->cmnd[1]);
- else {
- lba = get_unaligned_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) << curlun->blkbits;
-
- /* 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.
- */
- amount = min((unsigned int) amount_left, mod_data.buflen);
- amount = min((loff_t) amount,
- curlun->file_length - file_offset);
-
- /* Wait for the next buffer to become available */
- bh = fsg->next_buffhd_to_fill;
- while (bh->state != BUF_STATE_EMPTY) {
- rc = sleep_thread(fsg);
- if (rc)
- return rc;
- }
-
- /* If we were asked to read past the end of file,
- * end with an empty buffer. */
- if (amount == 0) {
- curlun->sense_data =
- SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
- curlun->sense_data_info = file_offset >> curlun->blkbits;
- curlun->info_valid = 1;
- bh->inreq->length = 0;
- bh->state = BUF_STATE_FULL;
- break;
- }
-
- /* Perform the read */
- file_offset_tmp = file_offset;
- nread = vfs_read(curlun->filp,
- (char __user *) bh->buf,
- amount, &file_offset_tmp);
- VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
- (unsigned long long) file_offset,
- (int) nread);
- if (signal_pending(current))
- return -EINTR;
-
- if (nread < 0) {
- LDBG(curlun, "error in file read: %d\n",
- (int) nread);
- nread = 0;
- } else if (nread < amount) {
- LDBG(curlun, "partial file read: %d/%u\n",
- (int) nread, amount);
- nread = round_down(nread, curlun->blksize);
- }
- file_offset += nread;
- amount_left -= nread;
- fsg->residue -= nread;
-
- /* Except at the end of the transfer, nread will be
- * equal to the buffer size, which is divisible by the
- * bulk-in maxpacket size.
- */
- 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 >> curlun->blkbits;
- curlun->info_valid = 1;
- 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 fsg_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;
- ssize_t nwritten;
- int rc;
-
- if (curlun->ro) {
- curlun->sense_data = SS_WRITE_PROTECTED;
- return -EINVAL;
- }
- spin_lock(&curlun->filp->f_lock);
- curlun->filp->f_flags &= ~O_SYNC; // Default is not to wait
- spin_unlock(&curlun->filp->f_lock);
-
- /* Get the starting Logical Block Address and check that it's
- * not too big */
- if (fsg->cmnd[0] == WRITE_6)
- lba = get_unaligned_be24(&fsg->cmnd[1]);
- else {
- lba = get_unaligned_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;
- }
- /* FUA */
- if (!curlun->nofua && (fsg->cmnd[1] & 0x08)) {
- spin_lock(&curlun->filp->f_lock);
- curlun->filp->f_flags |= O_DSYNC;
- spin_unlock(&curlun->filp->f_lock);
- }
- }
- 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) << curlun->blkbits;
- 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 not more than the buffer size.
- */
- amount = min(amount_left_to_req, mod_data.buflen);
-
- /* Beyond the end of the backing file? */
- if (usb_offset >= curlun->file_length) {
- get_some_more = 0;
- curlun->sense_data =
- SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
- curlun->sense_data_info = usb_offset >> curlun->blkbits;
- curlun->info_valid = 1;
- 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;
-
- /* Except at the end of the transfer, amount will be
- * equal to the buffer size, which is divisible by
- * the bulk-out maxpacket size.
- */
- set_bulk_out_req_length(fsg, bh, amount);
- start_transfer(fsg, fsg->bulk_out, bh->outreq,
- &bh->outreq_busy, &bh->state);
- fsg->next_buffhd_to_fill = bh->next;
- continue;
- }
-
- /* Write the received data to the backing file */
- bh = fsg->next_buffhd_to_drain;
- if (bh->state == BUF_STATE_EMPTY && !get_some_more)
- break; // We stopped early
- if (bh->state == BUF_STATE_FULL) {
- smp_rmb();
- fsg->next_buffhd_to_drain = bh->next;
- bh->state = BUF_STATE_EMPTY;
-
- /* Did something go wrong with the transfer? */
- if (bh->outreq->status != 0) {
- curlun->sense_data = SS_COMMUNICATION_FAILURE;
- curlun->sense_data_info = file_offset >> curlun->blkbits;
- curlun->info_valid = 1;
- break;
- }
-
- amount = bh->outreq->actual;
- if (curlun->file_length - file_offset < amount) {
- LERROR(curlun,
- "write %u @ %llu beyond end %llu\n",
- amount, (unsigned long long) file_offset,
- (unsigned long long) curlun->file_length);
- amount = curlun->file_length - file_offset;
- }
-
- /* Don't accept excess data. The spec doesn't say
- * what to do in this case. We'll ignore the error.
- */
- amount = min(amount, bh->bulk_out_intended_length);
-
- /* Don't write a partial block */
- amount = round_down(amount, curlun->blksize);
- if (amount == 0)
- goto empty_write;
-
- /* 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 = round_down(nwritten, curlun->blksize);
- }
- 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 >> curlun->blkbits;
- curlun->info_valid = 1;
- break;
- }
-
- empty_write:
- /* Did the host decide to stop early? */
- if (bh->outreq->actual < bh->bulk_out_intended_length) {
- fsg->short_packet_received = 1;
- break;
- }
- continue;
- }
-
- /* Wait for something to happen */
- rc = sleep_thread(fsg);
- if (rc)
- return rc;
- }
-
- return -EIO; // No default reply
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static int do_synchronize_cache(struct fsg_dev *fsg)
-{
- struct fsg_lun *curlun = fsg->curlun;
- int rc;
-
- /* We ignore the requested LBA and write out all file's
- * dirty data buffers. */
- rc = fsg_lun_fsync_sub(curlun);
- if (rc)
- curlun->sense_data = SS_WRITE_ERROR;
- return 0;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static void invalidate_sub(struct fsg_lun *curlun)
-{
- struct file *filp = curlun->filp;
- struct inode *inode = filp->f_path.dentry->d_inode;
- unsigned long rc;
-
- rc = invalidate_mapping_pages(inode->i_mapping, 0, -1);
- VLDBG(curlun, "invalidate_mapping_pages -> %ld\n", rc);
-}
-
-static int do_verify(struct fsg_dev *fsg)
-{
- struct fsg_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_unaligned_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_unaligned_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 << curlun->blkbits;
- file_offset = ((loff_t) lba) << curlun->blkbits;
-
- /* Write out all the dirty buffers before invalidating them */
- fsg_lun_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.
- */
- 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 >> curlun->blkbits;
- curlun->info_valid = 1;
- break;
- }
-
- /* Perform the read */
- file_offset_tmp = file_offset;
- nread = vfs_read(curlun->filp,
- (char __user *) bh->buf,
- amount, &file_offset_tmp);
- VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
- (unsigned long long) file_offset,
- (int) nread);
- if (signal_pending(current))
- return -EINTR;
-
- if (nread < 0) {
- LDBG(curlun, "error in file verify: %d\n",
- (int) nread);
- nread = 0;
- } else if (nread < amount) {
- LDBG(curlun, "partial file verify: %d/%u\n",
- (int) nread, amount);
- nread = round_down(nread, curlun->blksize);
- }
- if (nread == 0) {
- curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
- curlun->sense_data_info = file_offset >> curlun->blkbits;
- curlun->info_valid = 1;
- break;
- }
- file_offset += nread;
- amount_left -= nread;
- }
- return 0;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static int do_inquiry(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
- u8 *buf = (u8 *) bh->buf;
-
- static char vendor_id[] = "Linux ";
- static char product_disk_id[] = "File-Stor Gadget";
- static char product_cdrom_id[] = "File-CD Gadget ";
-
- if (!fsg->curlun) { // Unsupported LUNs are okay
- fsg->bad_lun_okay = 1;
- memset(buf, 0, 36);
- buf[0] = 0x7f; // Unsupported, no device-type
- buf[4] = 31; // Additional length
- return 36;
- }
-
- memset(buf, 0, 8);
- buf[0] = (mod_data.cdrom ? TYPE_ROM : TYPE_DISK);
- 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,
- (mod_data.cdrom ? product_cdrom_id :
- product_disk_id),
- mod_data.release);
- return 36;
-}
-
-
-static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
- struct fsg_lun *curlun = fsg->curlun;
- u8 *buf = (u8 *) bh->buf;
- u32 sd, sdinfo;
- int valid;
-
- /*
- * From the SCSI-2 spec., section 7.9 (Unit attention condition):
- *
- * If a REQUEST SENSE command is received from an initiator
- * with a pending unit attention condition (before the target
- * generates the contingent allegiance condition), then the
- * target shall either:
- * a) report any pending sense data and preserve the unit
- * attention condition on the logical unit, or,
- * b) report the unit attention condition, may discard any
- * pending sense data, and clear the unit attention
- * condition on the logical unit for that initiator.
- *
- * FSG normally uses option a); enable this code to use option b).
- */
-#if 0
- if (curlun && curlun->unit_attention_data != SS_NO_SENSE) {
- curlun->sense_data = curlun->unit_attention_data;
- curlun->unit_attention_data = SS_NO_SENSE;
- }
-#endif
-
- if (!curlun) { // Unsupported LUNs are okay
- fsg->bad_lun_okay = 1;
- sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
- sdinfo = 0;
- valid = 0;
- } else {
- sd = curlun->sense_data;
- sdinfo = curlun->sense_data_info;
- valid = curlun->info_valid << 7;
- curlun->sense_data = SS_NO_SENSE;
- curlun->sense_data_info = 0;
- curlun->info_valid = 0;
- }
-
- memset(buf, 0, 18);
- buf[0] = valid | 0x70; // Valid, current error
- buf[2] = SK(sd);
- put_unaligned_be32(sdinfo, &buf[3]); /* 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 fsg_lun *curlun = fsg->curlun;
- u32 lba = get_unaligned_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_unaligned_be32(curlun->num_sectors - 1, &buf[0]);
- /* Max logical block */
- put_unaligned_be32(curlun->blksize, &buf[4]); /* Block length */
- return 8;
-}
-
-
-static int do_read_header(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
- struct fsg_lun *curlun = fsg->curlun;
- int msf = fsg->cmnd[1] & 0x02;
- u32 lba = get_unaligned_be32(&fsg->cmnd[2]);
- u8 *buf = (u8 *) bh->buf;
-
- if ((fsg->cmnd[1] & ~0x02) != 0) { /* Mask away MSF */
- 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;
- }
-
- memset(buf, 0, 8);
- buf[0] = 0x01; /* 2048 bytes of user data, rest is EC */
- store_cdrom_address(&buf[4], msf, lba);
- return 8;
-}
-
-
-static int do_read_toc(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
- struct fsg_lun *curlun = fsg->curlun;
- int msf = fsg->cmnd[1] & 0x02;
- int start_track = fsg->cmnd[6];
- u8 *buf = (u8 *) bh->buf;
-
- if ((fsg->cmnd[1] & ~0x02) != 0 || /* Mask away MSF */
- start_track > 1) {
- curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
- return -EINVAL;
- }
-
- memset(buf, 0, 20);
- buf[1] = (20-2); /* TOC data length */
- buf[2] = 1; /* First track number */
- buf[3] = 1; /* Last track number */
- buf[5] = 0x16; /* Data track, copying allowed */
- buf[6] = 0x01; /* Only track is number 1 */
- store_cdrom_address(&buf[8], msf, 0);
-
- buf[13] = 0x16; /* Lead-out track is data */
- buf[14] = 0xAA; /* Lead-out track number */
- store_cdrom_address(&buf[16], msf, curlun->num_sectors);
- return 20;
-}
-
-
-static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
- struct fsg_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 == MODE_SENSE) {
- buf[2] = (curlun->ro ? 0x80 : 0x00); // WP, DPOFUA
- buf += 4;
- limit = 255;
- } else { // 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_unaligned_be16(0xffff, &buf[4]);
- /* Don't disable prefetch */
- /* Minimum prefetch = 0 */
- put_unaligned_be16(0xffff, &buf[8]);
- /* Maximum prefetch */
- put_unaligned_be16(0xffff, &buf[10]);
- /* 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 == MODE_SENSE)
- buf0[0] = len - 1;
- else
- put_unaligned_be16(len - 2, buf0);
- return len;
-}
-
-
-static int do_start_stop(struct fsg_dev *fsg)
-{
- struct fsg_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);
- fsg_lun_close(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 (!fsg_lun_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 fsg_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)
- fsg_lun_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 fsg_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_unaligned_be32(curlun->num_sectors, &buf[0]);
- /* Number of blocks */
- put_unaligned_be32(curlun->blksize, &buf[4]); /* Block length */
- buf[4] = 0x02; /* Current capacity */
- return 12;
-}
-
-
-static int do_mode_select(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
- struct fsg_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) {
- WARNING(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 wedge_bulk_in_endpoint(struct fsg_dev *fsg)
-{
- int rc;
-
- DBG(fsg, "bulk-in set wedge\n");
- rc = usb_ep_set_wedge(fsg->bulk_in);
- if (rc == -EAGAIN)
- VDBG(fsg, "delayed bulk-in endpoint wedge\n");
- while (rc != 0) {
- if (rc != -EAGAIN) {
- WARNING(fsg, "usb_ep_set_wedge -> %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_wedge(fsg->bulk_in);
- }
- return rc;
-}
-
-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) {
- smp_rmb();
- bh->state = BUF_STATE_EMPTY;
- fsg->next_buffhd_to_drain = bh->next;
-
- /* A short packet or an error ends everything */
- if (bh->outreq->actual < bh->bulk_out_intended_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);
-
- /* Except at the end of the transfer, amount will be
- * equal to the buffer size, which is divisible by
- * the bulk-out maxpacket size.
- */
- set_bulk_out_req_length(fsg, bh, amount);
- start_transfer(fsg, fsg->bulk_out, bh->outreq,
- &bh->outreq_busy, &bh->state);
- fsg->next_buffhd_to_fill = bh->next;
- fsg->usb_amount_left -= amount;
- continue;
- }
-
- /* Otherwise wait for something to happen */
- rc = sleep_thread(fsg);
- if (rc)
- return rc;
- }
- return 0;
-}
-
-
-static int finish_reply(struct fsg_dev *fsg)
-{
- struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
- int rc = 0;
-
- switch (fsg->data_dir) {
- case DATA_DIR_NONE:
- break; // Nothing to send
-
- /* 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, mark the end of the data with a short
- * packet. If we are allowed to stall, halt the bulk-in
- * endpoint. (Note: This violates the Bulk-Only Transport
- * specification, which requires us to pad the data if we
- * don't halt the endpoint. Presumably nobody will mind.)
- */
- 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;
- if (mod_data.can_stall)
- rc = halt_bulk_in_endpoint(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 fsg_lun *curlun = fsg->curlun;
- struct fsg_buffhd *bh;
- int rc;
- u8 status = US_BULK_STAT_OK;
- u32 sd, sdinfo = 0;
-
- /* Wait for the next buffer to become available */
- bh = fsg->next_buffhd_to_fill;
- while (bh->state != BUF_STATE_EMPTY) {
- rc = sleep_thread(fsg);
- if (rc)
- return rc;
- }
-
- 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 = US_BULK_STAT_PHASE;
- sd = SS_INVALID_COMMAND;
- } else if (sd != SS_NO_SENSE) {
- DBG(fsg, "sending command-failure status\n");
- status = US_BULK_STAT_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 = bh->buf;
-
- /* Store and send the Bulk-only CSW */
- csw->Signature = cpu_to_le32(US_BULK_CS_SIGN);
- csw->Tag = fsg->tag;
- csw->Residue = cpu_to_le32(fsg->residue);
- csw->Status = status;
-
- bh->inreq->length = US_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 = 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->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 fsg_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: There are plenty of buggy SCSI
- * implementations. Many have issues with cbw->Length
- * field passing a wrong command size. For those cases we
- * always try to work around the problem by using the length
- * sent by the host side provided it is at least as large
- * as the correct command length.
- * Examples of such cases would be MS-Windows, which issues
- * REQUEST SENSE with cbw->Length == 12 where it should
- * be 6, and xbox360 issuing INQUIRY, TEST UNIT READY and
- * REQUEST SENSE with cbw->Length == 10 where it should
- * be 6 as well.
- */
- if (cmnd_size <= fsg->cmnd_size) {
- DBG(fsg, "%s is buggy! Expected length %d "
- "but we got %d\n", name,
- cmnd_size, fsg->cmnd_size);
- cmnd_size = fsg->cmnd_size;
- } else {
- fsg->phase_error = 1;
- return -EINVAL;
- }
- }
-
- /* Check that the LUN values are consistent */
- if (transport_is_bbb()) {
- if (fsg->lun != lun)
- DBG(fsg, "using LUN %d from CBW, "
- "not LUN %d from CDB\n",
- fsg->lun, lun);
- }
-
- /* Check the LUN */
- curlun = fsg->curlun;
- if (curlun) {
- if (fsg->cmnd[0] != REQUEST_SENSE) {
- curlun->sense_data = SS_NO_SENSE;
- curlun->sense_data_info = 0;
- curlun->info_valid = 0;
- }
- } else {
- 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] != INQUIRY &&
- fsg->cmnd[0] != 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] != INQUIRY &&
- fsg->cmnd[0] != 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 && !fsg_lun_is_open(curlun) && needs_medium) {
- curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
- return -EINVAL;
- }
-
- return 0;
-}
-
-/* wrapper of check_command for data size in blocks handling */
-static int check_command_size_in_blocks(struct fsg_dev *fsg, int cmnd_size,
- enum data_direction data_dir, unsigned int mask,
- int needs_medium, const char *name)
-{
- if (fsg->curlun)
- fsg->data_size_from_cmnd <<= fsg->curlun->blkbits;
- return check_command(fsg, cmnd_size, data_dir,
- mask, needs_medium, name);
-}
-
-static int do_scsi_command(struct fsg_dev *fsg)
-{
- struct fsg_buffhd *bh;
- int rc;
- int reply = -EINVAL;
- int i;
- static char unknown[16];
-
- dump_cdb(fsg);
-
- /* Wait for the next buffer to become available for data or status */
- bh = fsg->next_buffhd_to_drain = fsg->next_buffhd_to_fill;
- while (bh->state != BUF_STATE_EMPTY) {
- rc = sleep_thread(fsg);
- if (rc)
- return rc;
- }
- fsg->phase_error = 0;
- fsg->short_packet_received = 0;
-
- down_read(&fsg->filesem); // We're using the backing file
- switch (fsg->cmnd[0]) {
-
- case 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 MODE_SELECT:
- 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 MODE_SELECT_10:
- fsg->data_size_from_cmnd = get_unaligned_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 MODE_SENSE:
- 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 MODE_SENSE_10:
- fsg->data_size_from_cmnd = get_unaligned_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 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 READ_6:
- i = fsg->cmnd[4];
- fsg->data_size_from_cmnd = (i == 0) ? 256 : i;
- if ((reply = check_command_size_in_blocks(fsg, 6,
- DATA_DIR_TO_HOST,
- (7<<1) | (1<<4), 1,
- "READ(6)")) == 0)
- reply = do_read(fsg);
- break;
-
- case READ_10:
- fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
- if ((reply = check_command_size_in_blocks(fsg, 10,
- DATA_DIR_TO_HOST,
- (1<<1) | (0xf<<2) | (3<<7), 1,
- "READ(10)")) == 0)
- reply = do_read(fsg);
- break;
-
- case READ_12:
- fsg->data_size_from_cmnd = get_unaligned_be32(&fsg->cmnd[6]);
- if ((reply = check_command_size_in_blocks(fsg, 12,
- DATA_DIR_TO_HOST,
- (1<<1) | (0xf<<2) | (0xf<<6), 1,
- "READ(12)")) == 0)
- reply = do_read(fsg);
- break;
-
- case 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 READ_HEADER:
- if (!mod_data.cdrom)
- goto unknown_cmnd;
- fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
- if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
- (3<<7) | (0x1f<<1), 1,
- "READ HEADER")) == 0)
- reply = do_read_header(fsg, bh);
- break;
-
- case READ_TOC:
- if (!mod_data.cdrom)
- goto unknown_cmnd;
- fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
- if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
- (7<<6) | (1<<1), 1,
- "READ TOC")) == 0)
- reply = do_read_toc(fsg, bh);
- break;
-
- case READ_FORMAT_CAPACITIES:
- fsg->data_size_from_cmnd = get_unaligned_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 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 START_STOP:
- 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 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 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 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 WRITE_6:
- i = fsg->cmnd[4];
- fsg->data_size_from_cmnd = (i == 0) ? 256 : i;
- if ((reply = check_command_size_in_blocks(fsg, 6,
- DATA_DIR_FROM_HOST,
- (7<<1) | (1<<4), 1,
- "WRITE(6)")) == 0)
- reply = do_write(fsg);
- break;
-
- case WRITE_10:
- fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
- if ((reply = check_command_size_in_blocks(fsg, 10,
- DATA_DIR_FROM_HOST,
- (1<<1) | (0xf<<2) | (3<<7), 1,
- "WRITE(10)")) == 0)
- reply = do_write(fsg);
- break;
-
- case WRITE_12:
- fsg->data_size_from_cmnd = get_unaligned_be32(&fsg->cmnd[6]);
- if ((reply = check_command_size_in_blocks(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 FORMAT_UNIT:
- case RELEASE:
- case RESERVE:
- case SEND_DIAGNOSTIC:
- // Fall through
-
- default:
- unknown_cmnd:
- 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, ~0, 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 = req->buf;
-
- /* Was this a real packet? Should it be ignored? */
- if (req->status || test_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags))
- return -EINVAL;
-
- /* Is the CBW valid? */
- if (req->actual != US_BULK_CB_WRAP_LEN ||
- cbw->Signature != cpu_to_le32(
- US_BULK_CB_SIGN)) {
- 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 IN endpoint
- * (6.6.1), so it's unavoidable. It also says we must
- * retain this state until the next reset, but there's
- * no way to tell the controller driver it should ignore
- * Clear-Feature(HALT) requests.
- *
- * We aren't required to halt the OUT endpoint; instead
- * we can simply accept and discard any data received
- * until the next reset. */
- wedge_bulk_in_endpoint(fsg);
- set_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags);
- return -EINVAL;
- }
-
- /* Is the CBW meaningful? */
- if (cbw->Lun >= FSG_MAX_LUNS || cbw->Flags & ~US_BULK_FLAG_IN ||
- cbw->Length <= 0 || cbw->Length > MAX_COMMAND_SIZE) {
- DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, "
- "cmdlen %u\n",
- cbw->Lun, cbw->Flags, cbw->Length);
-
- /* 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 & US_BULK_FLAG_IN)
- 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) {
- rc = sleep_thread(fsg);
- if (rc)
- return rc;
- }
-
- /* Queue a request to read a Bulk-only CBW */
- set_bulk_out_req_length(fsg, bh, US_BULK_CB_WRAP_LEN);
- start_transfer(fsg, fsg->bulk_out, bh->outreq,
- &bh->outreq_busy, &bh->state);
-
- /* We will drain the buffer in software, which means we
- * can reuse it for the next filling. No need to advance
- * next_buffhd_to_fill. */
-
- /* Wait for the CBW to arrive */
- while (bh->state != BUF_STATE_FULL) {
- rc = sleep_thread(fsg);
- if (rc)
- return rc;
- }
- smp_rmb();
- rc = received_cbw(fsg, bh);
- bh->state = BUF_STATE_EMPTY;
-
- } else { // USB_PR_CB or USB_PR_CBI
-
- /* Wait for the next command to arrive */
- while (fsg->cbbuf_cmnd_size == 0) {
- rc = sleep_thread(fsg);
- if (rc)
- 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);
-
- /* Use LUN from the command */
- fsg->lun = fsg->cmnd[1] >> 5;
- }
-
- /* Update current lun */
- if (fsg->lun >= 0 && fsg->lun < fsg->nluns)
- fsg->curlun = &fsg->luns[fsg->lun];
- else
- fsg->curlun = NULL;
-
- 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;
- ep->desc = d;
- rc = usb_ep_enable(ep);
- 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 < fsg_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 = fsg_ep_desc(fsg->gadget,
- &fsg_fs_bulk_in_desc, &fsg_hs_bulk_in_desc,
- &fsg_ss_bulk_in_desc);
- if ((rc = enable_endpoint(fsg, fsg->bulk_in, d)) != 0)
- goto reset;
- fsg->bulk_in_enabled = 1;
-
- d = fsg_ep_desc(fsg->gadget,
- &fsg_fs_bulk_out_desc, &fsg_hs_bulk_out_desc,
- &fsg_ss_bulk_out_desc);
- if ((rc = enable_endpoint(fsg, fsg->bulk_out, d)) != 0)
- goto reset;
- fsg->bulk_out_enabled = 1;
- fsg->bulk_out_maxpacket = usb_endpoint_maxp(d);
- clear_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags);
-
- if (transport_is_cbi()) {
- d = fsg_ep_desc(fsg->gadget,
- &fsg_fs_intr_in_desc, &fsg_hs_intr_in_desc,
- &fsg_ss_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 < fsg_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->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
- INFO(fsg, "%s config #%d\n",
- usb_speed_string(fsg->gadget->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 fsg_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, ¤t->blocked, &info);
- if (!sig)
- break;
- if (sig != SIGUSR1) {
- if (fsg->state < FSG_STATE_EXIT)
- DBG(fsg, "Main thread exiting on signal\n");
- raise_exception(fsg, FSG_STATE_EXIT);
- }
- }
-
- /* Cancel all the pending transfers */
- if (fsg->intreq_busy)
- usb_ep_dequeue(fsg->intr_in, fsg->intreq);
- for (i = 0; i < fsg_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 < fsg_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 < fsg_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;
- curlun->info_valid = 0;
- }
- fsg->state = FSG_STATE_IDLE;
- }
- spin_unlock_irq(&fsg->lock);
-
- /* Carry out any extra actions required for the exception */
- switch (old_state) {
- default:
- break;
-
- case FSG_STATE_ABORT_BULK_OUT:
- 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(IGNORE_BULK_OUT, &fsg->atomic_bitflags))
- usb_ep_clear_halt(fsg->bulk_in);
-
- 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:
- for (i = 0; i < fsg->nluns; ++i)
- fsg_lun_fsync_sub(fsg->luns + i);
- 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 = fsg_;
-
- /* Allow the thread to be killed by a signal, but set the signal mask
- * to block everything but INT, TERM, KILL, and USR1. */
- allow_signal(SIGINT);
- allow_signal(SIGTERM);
- allow_signal(SIGKILL);
- allow_signal(SIGUSR1);
-
- /* Allow the thread to be frozen */
- set_freezable();
-
- /* Arrange for userspace references to be interpreted as kernel
- * pointers. That way we can pass a kernel pointer to a routine
- * that expects a __user pointer and it will work okay. */
- set_fs(get_ds());
-
- /* The main loop */
- while (fsg->state != FSG_STATE_TERMINATED) {
- if (exception_in_progress(fsg) || signal_pending(current)) {
- handle_exception(fsg);
- continue;
- }
-
- if (!fsg->running) {
- sleep_thread(fsg);
- continue;
- }
-
- if (get_next_command(fsg))
- continue;
-
- spin_lock_irq(&fsg->lock);
- if (!exception_in_progress(fsg))
- fsg->state = FSG_STATE_DATA_PHASE;
- spin_unlock_irq(&fsg->lock);
-
- if (do_scsi_command(fsg) || finish_reply(fsg))
- continue;
-
- spin_lock_irq(&fsg->lock);
- if (!exception_in_progress(fsg))
- fsg->state = FSG_STATE_STATUS_PHASE;
- spin_unlock_irq(&fsg->lock);
-
- if (send_status(fsg))
- continue;
-
- spin_lock_irq(&fsg->lock);
- if (!exception_in_progress(fsg))
- fsg->state = FSG_STATE_IDLE;
- spin_unlock_irq(&fsg->lock);
- }
-
- spin_lock_irq(&fsg->lock);
- fsg->thread_task = NULL;
- spin_unlock_irq(&fsg->lock);
-
- /* If we are exiting because of a signal, unregister the
- * gadget driver. */
- if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags))
- usb_gadget_unregister_driver(&fsg_driver);
-
- /* Let the unbind and cleanup routines know the thread has exited */
- complete_and_exit(&fsg->thread_notifier, 0);
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-
-/* The write permissions and store_xxx pointers are set in fsg_bind() */
-static DEVICE_ATTR(ro, 0444, fsg_show_ro, NULL);
-static DEVICE_ATTR(nofua, 0644, fsg_show_nofua, NULL);
-static DEVICE_ATTR(file, 0444, fsg_show_file, NULL);
-
-
-/*-------------------------------------------------------------------------*/
-
-static void fsg_release(struct kref *ref)
-{
- struct fsg_dev *fsg = container_of(ref, struct fsg_dev, ref);
-
- kfree(fsg->luns);
- kfree(fsg);
-}
-
-static void lun_release(struct device *dev)
-{
- struct rw_semaphore *filesem = dev_get_drvdata(dev);
- struct fsg_dev *fsg =
- container_of(filesem, struct fsg_dev, filesem);
-
- kref_put(&fsg->ref, fsg_release);
-}
-
-static void /* __init_or_exit */ fsg_unbind(struct usb_gadget *gadget)
-{
- struct fsg_dev *fsg = get_gadget_data(gadget);
- int i;
- struct fsg_lun *curlun;
- struct usb_request *req = fsg->ep0req;
-
- DBG(fsg, "unbind\n");
- clear_bit(REGISTERED, &fsg->atomic_bitflags);
-
- /* 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);
- }
-
- /* Unregister the sysfs attribute files and the LUNs */
- for (i = 0; i < fsg->nluns; ++i) {
- curlun = &fsg->luns[i];
- if (curlun->registered) {
- device_remove_file(&curlun->dev, &dev_attr_nofua);
- device_remove_file(&curlun->dev, &dev_attr_ro);
- device_remove_file(&curlun->dev, &dev_attr_file);
- fsg_lun_close(curlun);
- device_unregister(&curlun->dev);
- curlun->registered = 0;
- }
- }
-
- /* Free the data buffers */
- for (i = 0; i < fsg_num_buffers; ++i)
- kfree(fsg->buffhds[i].buf);
-
- /* Free the request and buffer for endpoint 0 */
- if (req) {
- kfree(req->buf);
- 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";
-
- /* Some peripheral controllers are known not to be able to
- * halt bulk endpoints correctly. If one of them is present,
- * disable stalls.
- */
- if (gadget_is_at91(fsg->gadget))
- mod_data.can_stall = 0;
-
- if (mod_data.release == 0xffff)
- mod_data.release = get_default_bcdDevice();
-
- 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 */
-
- /* Serial string handling.
- * On a real device, the serial string would be loaded
- * from permanent storage. */
- if (mod_data.serial) {
- const char *ch;
- unsigned len = 0;
-
- /* Sanity check :
- * The CB[I] specification limits the serial string to
- * 12 uppercase hexadecimal characters.
- * BBB need at least 12 uppercase hexadecimal characters,
- * with a maximum of 126. */
- for (ch = mod_data.serial; *ch; ++ch) {
- ++len;
- if ((*ch < '0' || *ch > '9') &&
- (*ch < 'A' || *ch > 'F')) { /* not uppercase hex */
- WARNING(fsg,
- "Invalid serial string character: %c\n",
- *ch);
- goto no_serial;
- }
- }
- if (len > 126 ||
- (mod_data.transport_type == USB_PR_BULK && len < 12) ||
- (mod_data.transport_type != USB_PR_BULK && len > 12)) {
- WARNING(fsg, "Invalid serial string length!\n");
- goto no_serial;
- }
- fsg_strings[FSG_STRING_SERIAL - 1].s = mod_data.serial;
- } else {
- WARNING(fsg, "No serial-number string provided!\n");
- no_serial:
- device_desc.iSerialNumber = 0;
- }
-
- return 0;
-}
-
-
-static int __init fsg_bind(struct usb_gadget *gadget,
- struct usb_gadget_driver *driver)
-{
- struct fsg_dev *fsg = the_fsg;
- int rc;
- int i;
- struct fsg_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_file.attr.mode = 0644;
- dev_attr_file.store = fsg_store_file;
- if (!mod_data.cdrom) {
- dev_attr_ro.attr.mode = 0644;
- dev_attr_ro.store = fsg_store_ro;
- }
- }
-
- /* Only for removable media? */
- dev_attr_nofua.attr.mode = 0644;
- dev_attr_nofua.store = fsg_store_nofua;
-
- /* Find out how many LUNs there should be */
- i = mod_data.nluns;
- if (i == 0)
- i = max(mod_data.num_filenames, 1u);
- if (i > FSG_MAX_LUNS) {
- ERROR(fsg, "invalid number of LUNs: %d\n", i);
- rc = -EINVAL;
- goto out;
- }
-
- /* Create the LUNs, open their backing files, and register the
- * LUN devices in sysfs. */
- fsg->luns = kzalloc(i * sizeof(struct fsg_lun), GFP_KERNEL);
- if (!fsg->luns) {
- rc = -ENOMEM;
- goto out;
- }
- fsg->nluns = i;
-
- for (i = 0; i < fsg->nluns; ++i) {
- curlun = &fsg->luns[i];
- curlun->cdrom = !!mod_data.cdrom;
- curlun->ro = mod_data.cdrom || mod_data.ro[i];
- curlun->initially_ro = curlun->ro;
- curlun->removable = mod_data.removable;
- curlun->nofua = mod_data.nofua[i];
- curlun->dev.release = lun_release;
- curlun->dev.parent = &gadget->dev;
- curlun->dev.driver = &fsg_driver.driver;
- dev_set_drvdata(&curlun->dev, &fsg->filesem);
- dev_set_name(&curlun->dev,"%s-lun%d",
- dev_name(&gadget->dev), i);
-
- kref_get(&fsg->ref);
- rc = device_register(&curlun->dev);
- if (rc) {
- INFO(fsg, "failed to register LUN%d: %d\n", i, rc);
- put_device(&curlun->dev);
- goto out;
- }
- curlun->registered = 1;
-
- rc = device_create_file(&curlun->dev, &dev_attr_ro);
- if (rc)
- goto out;
- rc = device_create_file(&curlun->dev, &dev_attr_nofua);
- if (rc)
- goto out;
- rc = device_create_file(&curlun->dev, &dev_attr_file);
- if (rc)
- goto out;
-
- if (mod_data.file[i] && *mod_data.file[i]) {
- rc = fsg_lun_open(curlun, mod_data.file[i]);
- if (rc)
- 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, &fsg_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, &fsg_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, &fsg_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.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
- fsg_intf_desc.bNumEndpoints = i;
- fsg_intf_desc.bInterfaceSubClass = mod_data.protocol_type;
- fsg_intf_desc.bInterfaceProtocol = mod_data.transport_type;
- fsg_fs_function[i + FSG_FS_FUNCTION_PRE_EP_ENTRIES] = NULL;
-
- if (gadget_is_dualspeed(gadget)) {
- fsg_hs_function[i + FSG_HS_FUNCTION_PRE_EP_ENTRIES] = NULL;
-
- /* Assume endpoint addresses are the same for both speeds */
- fsg_hs_bulk_in_desc.bEndpointAddress =
- fsg_fs_bulk_in_desc.bEndpointAddress;
- fsg_hs_bulk_out_desc.bEndpointAddress =
- fsg_fs_bulk_out_desc.bEndpointAddress;
- fsg_hs_intr_in_desc.bEndpointAddress =
- fsg_fs_intr_in_desc.bEndpointAddress;
- }
-
- if (gadget_is_superspeed(gadget)) {
- unsigned max_burst;
-
- fsg_ss_function[i + FSG_SS_FUNCTION_PRE_EP_ENTRIES] = NULL;
-
- /* Calculate bMaxBurst, we know packet size is 1024 */
- max_burst = min_t(unsigned, mod_data.buflen / 1024, 15);
-
- /* Assume endpoint addresses are the same for both speeds */
- fsg_ss_bulk_in_desc.bEndpointAddress =
- fsg_fs_bulk_in_desc.bEndpointAddress;
- fsg_ss_bulk_in_comp_desc.bMaxBurst = max_burst;
-
- fsg_ss_bulk_out_desc.bEndpointAddress =
- fsg_fs_bulk_out_desc.bEndpointAddress;
- fsg_ss_bulk_out_comp_desc.bMaxBurst = max_burst;
- }
-
- if (gadget_is_otg(gadget))
- fsg_otg_desc.bmAttributes |= USB_OTG_HNP;
-
- 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 = kmalloc(EP0_BUFSIZE, GFP_KERNEL);
- if (!req->buf)
- goto out;
- req->complete = ep0_complete;
-
- /* Allocate the data buffers */
- for (i = 0; i < fsg_num_buffers; ++i) {
- struct fsg_buffhd *bh = &fsg->buffhds[i];
-
- /* Allocate for the bulk-in endpoint. We assume that
- * the buffer will also work with the bulk-out (and
- * interrupt-in) endpoint. */
- bh->buf = kmalloc(mod_data.buflen, GFP_KERNEL);
- if (!bh->buf)
- goto out;
- bh->next = bh + 1;
- }
- fsg->buffhds[fsg_num_buffers - 1].next = &fsg->buffhds[0];
-
- /* This should reflect the actual gadget power source */
- usb_gadget_set_selfpowered(gadget);
-
- snprintf(fsg_string_manufacturer, sizeof fsg_string_manufacturer,
- "%s %s with %s",
- init_utsname()->sysname, init_utsname()->release,
- gadget->name);
-
- fsg->thread_task = kthread_create(fsg_main_thread, fsg,
- "file-storage-gadget");
- if (IS_ERR(fsg->thread_task)) {
- rc = PTR_ERR(fsg->thread_task);
- goto out;
- }
-
- INFO(fsg, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
- INFO(fsg, "NOTE: This driver is deprecated. "
- "Consider using g_mass_storage instead.\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 (fsg_lun_is_open(curlun)) {
- p = NULL;
- if (pathbuf) {
- p = d_path(&curlun->filp->f_path,
- pathbuf, PATH_MAX);
- if (IS_ERR(p))
- p = NULL;
- }
- LINFO(curlun, "ro=%d, nofua=%d, file: %s\n",
- curlun->ro, curlun->nofua, (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, cdrom=%d, buflen=%u\n",
- mod_data.removable, mod_data.can_stall,
- mod_data.cdrom, mod_data.buflen);
- DBG(fsg, "I/O thread pid: %d\n", task_pid_nr(fsg->thread_task));
-
- set_bit(REGISTERED, &fsg->atomic_bitflags);
-
- /* Tell the thread to start working */
- wake_up_process(fsg->thread_task);
- return 0;
-
-autoconf_fail:
- ERROR(fsg, "unable to autoconfigure all endpoints\n");
- rc = -ENOTSUPP;
-
-out:
- fsg->state = FSG_STATE_TERMINATED; // The thread is dead
- fsg_unbind(gadget);
- complete(&fsg->thread_notifier);
- 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 __refdata struct usb_gadget_driver fsg_driver = {
- .max_speed = USB_SPEED_SUPER,
- .function = (char *) fsg_string_product,
- .bind = fsg_bind,
- .unbind = fsg_unbind,
- .disconnect = fsg_disconnect,
- .setup = fsg_setup,
- .suspend = fsg_suspend,
- .resume = fsg_resume,
-
- .driver = {
- .name = DRIVER_NAME,
- .owner = THIS_MODULE,
- // .release = ...
- // .suspend = ...
- // .resume = ...
- },
-};
-
-
-static int __init fsg_alloc(void)
-{
- struct fsg_dev *fsg;
-
- fsg = kzalloc(sizeof *fsg +
- fsg_num_buffers * sizeof *(fsg->buffhds), GFP_KERNEL);
-
- if (!fsg)
- return -ENOMEM;
- spin_lock_init(&fsg->lock);
- init_rwsem(&fsg->filesem);
- kref_init(&fsg->ref);
- init_completion(&fsg->thread_notifier);
-
- the_fsg = fsg;
- return 0;
-}
-
-
-static int __init fsg_init(void)
-{
- int rc;
- struct fsg_dev *fsg;
-
- rc = fsg_num_buffers_validate();
- if (rc != 0)
- return rc;
-
- if ((rc = fsg_alloc()) != 0)
- return rc;
- fsg = the_fsg;
- rc = usb_gadget_probe_driver(&fsg_driver);
- if (rc != 0)
- kref_put(&fsg->ref, fsg_release);
- return rc;
-}
-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);
-
- kref_put(&fsg->ref, fsg_release);
-}
-module_exit(fsg_cleanup);
projects / karo-tx-linux.git / commitdiff