| /* |
| * 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. Note also that the CD-ROM block |
| * length is set to 512 rather than the more common value 2048. |
| * |
| * 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/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/ch9.h> |
| #include <linux/usb/gadget.h> |
| |
| #include "gadget_chips.h" |
| |
| |
| |
| /* |
| * Kbuild is not very cooperative with respect to linking separately |
| * compiled library objects into one module. So for now we won't use |
| * separate compilation ... ensuring init/exit sections work to shrink |
| * the runtime footprint, and giving us at least some parts of what |
| * a "gcc --combine ... part1.c part2.c part3.c ... " build would. |
| */ |
| #include "usbstring.c" |
| #include "config.c" |
| #include "epautoconf.c" |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| #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; |
| int ro[FSG_MAX_LUNS]; |
| int nofua[FSG_MAX_LUNS]; |
| unsigned int num_filenames; |
| unsigned int num_ros; |
| unsigned int num_nofuas; |
| unsigned int nluns; |
| |
| int removable; |
| int can_stall; |
| int 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; |
| struct fsg_buffhd buffhds[FSG_NUM_BUFFERS]; |
| |
| int thread_wakeup_needed; |
| struct completion thread_notifier; |
| struct task_struct *thread_task; |
| |
| int cmnd_size; |
| u8 cmnd[MAX_COMMAND_SIZE]; |
| enum data_direction data_dir; |
| u32 data_size; |
| u32 data_size_from_cmnd; |
| u32 tag; |
| unsigned int lun; |
| u32 residue; |
| u32 usb_amount_left; |
| |
| /* 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; |
| }; |
| |
| 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, |
| }; |
| |
| |
| |
| /* |
| * 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 USB_BULK_RESET_REQUEST: |
| if (ctrl->bRequestType != (USB_DIR_OUT | |
| USB_TYPE_CLASS | USB_RECIP_INTERFACE)) |
| break; |
| if (w_index != 0 || w_value != 0) { |
| value = -EDOM; |
| break; |
| } |
| |
| /* Raise an exception to stop the current operation |
| * and reinitialize our state. */ |
| DBG(fsg, "bulk reset request\n"); |
| raise_exception(fsg, FSG_STATE_RESET); |
| value = DELAYED_STATUS; |
| break; |
| |
| case USB_BULK_GET_MAX_LUN_REQUEST: |
| if (ctrl->bRequestType != (USB_DIR_IN | |
| USB_TYPE_CLASS | USB_RECIP_INTERFACE)) |
| break; |
| if (w_index != 0 || w_value != 0) { |
| value = -EDOM; |
| break; |
| } |
| VDBG(fsg, "get max LUN\n"); |
| *(u8 *) 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"); |
| 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)) |
| break; |
| 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)) |
| 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; |
| } |
| 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; |
| unsigned int partial_page; |
| ssize_t nread; |
| |
| /* Get the starting Logical Block Address and check that it's |
| * not too big */ |
| if (fsg->cmnd[0] == 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) << 9; |
| |
| /* Carry out the file reads */ |
| amount_left = fsg->data_size_from_cmnd; |
| if (unlikely(amount_left == 0)) |
| return -EIO; // No default reply |
| |
| for (;;) { |
| |
| /* Figure out how much we need to read: |
| * Try to read the remaining amount. |
| * But don't read more than the buffer size. |
| * And don't try to read past the end of the file. |
| * Finally, if we're not at a page boundary, don't read past |
| * the next page. |
| * If this means reading 0 then we were asked to read past |
| * the end of file. */ |
| amount = min((unsigned int) amount_left, mod_data.buflen); |
| amount = min((loff_t) amount, |
| curlun->file_length - file_offset); |
| partial_page = file_offset & (PAGE_CACHE_SIZE - 1); |
| if (partial_page > 0) |
| amount = min(amount, (unsigned int) PAGE_CACHE_SIZE - |
| partial_page); |
| |
| /* Wait for the next buffer to become available */ |
| bh = fsg->next_buffhd_to_fill; |
| while (bh->state != BUF_STATE_EMPTY) { |
| rc = sleep_thread(fsg); |
| if (rc) |
| return rc; |
| } |
| |
| /* If we were asked to read past the end of file, |
| * end with an empty buffer. */ |
| if (amount == 0) { |
| curlun->sense_data = |
| SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; |
| curlun->sense_data_info = file_offset >> 9; |
| curlun->info_valid = 1; |
| bh->inreq->length = 0; |
| bh->state = BUF_STATE_FULL; |
| break; |
| } |
| |
| /* Perform the read */ |
| file_offset_tmp = file_offset; |
| nread = vfs_read(curlun->filp, |
| (char __user *) bh->buf, |
| amount, &file_offset_tmp); |
| VLDBG(curlun, "file read %u @ %llu -> %d\n", amount, |
| (unsigned long long) file_offset, |
| (int) nread); |
| if (signal_pending(current)) |
| return -EINTR; |
| |
| if (nread < 0) { |
| LDBG(curlun, "error in file read: %d\n", |
| (int) nread); |
| nread = 0; |
| } else if (nread < amount) { |
| LDBG(curlun, "partial file read: %d/%u\n", |
| (int) nread, amount); |
| nread -= (nread & 511); // Round down to a block |
| } |
| file_offset += nread; |
| amount_left -= nread; |
| fsg->residue -= nread; |
| bh->inreq->length = nread; |
| bh->state = BUF_STATE_FULL; |
| |
| /* If an error occurred, report it and its position */ |
| if (nread < amount) { |
| curlun->sense_data = SS_UNRECOVERED_READ_ERROR; |
| curlun->sense_data_info = file_offset >> 9; |
| curlun->info_valid = 1; |
| break; |
| } |
| |
| if (amount_left == 0) |
| break; // No more left to read |
| |
| /* Send this buffer and go read some more */ |
| 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; |
| unsigned int partial_page; |
| 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) << 9; |
| amount_left_to_req = amount_left_to_write = fsg->data_size_from_cmnd; |
| |
| while (amount_left_to_write > 0) { |
| |
| /* Queue a request for more data from the host */ |
| bh = fsg->next_buffhd_to_fill; |
| if (bh->state == BUF_STATE_EMPTY && get_some_more) { |
| |
| /* Figure out how much we want to get: |
| * Try to get the remaining amount. |
| * But don't get more than the buffer size. |
| * And don't try to go past the end of the file. |
| * If we're not at a page boundary, |
| * don't go past the next page. |
| * If this means getting 0, then we were asked |
| * to write past the end of file. |
| * Finally, round down to a block boundary. */ |
| amount = min(amount_left_to_req, mod_data.buflen); |
| amount = min((loff_t) amount, curlun->file_length - |
| usb_offset); |
| partial_page = usb_offset & (PAGE_CACHE_SIZE - 1); |
| if (partial_page > 0) |
| amount = min(amount, |
| (unsigned int) PAGE_CACHE_SIZE - partial_page); |
| |
| if (amount == 0) { |
| get_some_more = 0; |
| curlun->sense_data = |
| SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; |
| curlun->sense_data_info = usb_offset >> 9; |
| curlun->info_valid = 1; |
| continue; |
| } |
| amount -= (amount & 511); |
| if (amount == 0) { |
| |
| /* Why were we were asked to transfer a |
| * partial block? */ |
| get_some_more = 0; |
| continue; |
| } |
| |
| /* Get the next buffer */ |
| usb_offset += amount; |
| fsg->usb_amount_left -= amount; |
| amount_left_to_req -= amount; |
| if (amount_left_to_req == 0) |
| get_some_more = 0; |
| |
| /* amount is always divisible by 512, hence by |
| * the bulk-out maxpacket size */ |
| bh->outreq->length = bh->bulk_out_intended_length = |
| amount; |
| bh->outreq->short_not_ok = 1; |
| start_transfer(fsg, fsg->bulk_out, bh->outreq, |
| &bh->outreq_busy, &bh->state); |
| fsg->next_buffhd_to_fill = bh->next; |
| continue; |
| } |
| |
| /* Write the received data to the backing file */ |
| bh = fsg->next_buffhd_to_drain; |
| if (bh->state == BUF_STATE_EMPTY && !get_some_more) |
| break; // We stopped early |
| if (bh->state == BUF_STATE_FULL) { |
| smp_rmb(); |
| fsg->next_buffhd_to_drain = bh->next; |
| bh->state = BUF_STATE_EMPTY; |
| |
| /* Did something go wrong with the transfer? */ |
| if (bh->outreq->status != 0) { |
| curlun->sense_data = SS_COMMUNICATION_FAILURE; |
| curlun->sense_data_info = file_offset >> 9; |
| curlun->info_valid = 1; |
| break; |
| } |
| |
| amount = bh->outreq->actual; |
| if (curlun->file_length - file_offset < amount) { |
| LERROR(curlun, |
| "write %u @ %llu beyond end %llu\n", |
| amount, (unsigned long long) file_offset, |
| (unsigned long long) curlun->file_length); |
| amount = curlun->file_length - file_offset; |
| } |
| |
| /* Perform the write */ |
| file_offset_tmp = file_offset; |
| nwritten = vfs_write(curlun->filp, |
| (char __user *) bh->buf, |
| amount, &file_offset_tmp); |
| VLDBG(curlun, "file write %u @ %llu -> %d\n", amount, |
| (unsigned long long) file_offset, |
| (int) nwritten); |
| if (signal_pending(current)) |
| return -EINTR; // Interrupted! |
| |
| if (nwritten < 0) { |
| LDBG(curlun, "error in file write: %d\n", |
| (int) nwritten); |
| nwritten = 0; |
| } else if (nwritten < amount) { |
| LDBG(curlun, "partial file write: %d/%u\n", |
| (int) nwritten, amount); |
| nwritten -= (nwritten & 511); |
| // Round down to a block |
| } |
| file_offset += nwritten; |
| amount_left_to_write -= nwritten; |
| fsg->residue -= nwritten; |
| |
| /* If an error occurred, report it and its position */ |
| if (nwritten < amount) { |
| curlun->sense_data = SS_WRITE_ERROR; |
| curlun->sense_data_info = file_offset >> 9; |
| curlun->info_valid = 1; |
| break; |
| } |
| |
| /* Did the host decide to stop early? */ |
| if (bh->outreq->actual != bh->outreq->length) { |
| fsg->short_packet_received = 1; |
| break; |
| } |
| continue; |
| } |
| |
| /* Wait for something to happen */ |
| rc = sleep_thread(fsg); |
| if (rc) |
| return rc; |
| } |
| |
| return -EIO; // No default reply |
| } |
| |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| 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 << 9; |
| file_offset = ((loff_t) lba) << 9; |
| |
| /* 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. |
| * If this means reading 0 then we were asked to read |
| * past the end of file. */ |
| amount = min((unsigned int) amount_left, mod_data.buflen); |
| amount = min((loff_t) amount, |
| curlun->file_length - file_offset); |
| if (amount == 0) { |
| curlun->sense_data = |
| SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; |
| curlun->sense_data_info = file_offset >> 9; |
| curlun->info_valid = 1; |
| break; |
| } |
| |
| /* Perform the read */ |
| file_offset_tmp = file_offset; |
| nread = vfs_read(curlun->filp, |
| (char __user *) bh->buf, |
| amount, &file_offset_tmp); |
| VLDBG(curlun, "file read %u @ %llu -> %d\n", amount, |
| (unsigned long long) file_offset, |
| (int) nread); |
| if (signal_pending(current)) |
| return -EINTR; |
| |
| if (nread < 0) { |
| LDBG(curlun, "error in file verify: %d\n", |
| (int) nread); |
| nread = 0; |
| } else if (nread < amount) { |
| LDBG(curlun, "partial file verify: %d/%u\n", |
| (int) nread, amount); |
| nread -= (nread & 511); // Round down to a sector |
| } |
| if (nread == 0) { |
| curlun->sense_data = SS_UNRECOVERED_READ_ERROR; |
| curlun->sense_data_info = file_offset >> 9; |
| curlun->info_valid = 1; |
| break; |
| } |
| file_offset += nread; |
| amount_left -= nread; |
| } |
| return 0; |
| } |
| |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static int do_inquiry(struct fsg_dev *fsg, struct fsg_buffhd *bh) |
| { |
| u8 *buf = (u8 *) bh->buf; |
| |
| 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(512, &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(512, &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->outreq->length || |
| bh->outreq->status != 0) { |
| raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT); |
| return -EINTR; |
| } |
| continue; |
| } |
| |
| /* Try to submit another request if we need one */ |
| bh = fsg->next_buffhd_to_fill; |
| if (bh->state == BUF_STATE_EMPTY && fsg->usb_amount_left > 0) { |
| amount = min(fsg->usb_amount_left, |
| (u32) mod_data.buflen); |
| |
| /* amount is always divisible by 512, hence by |
| * the bulk-out maxpacket size */ |
| bh->outreq->length = bh->bulk_out_intended_length = |
| amount; |
| bh->outreq->short_not_ok = 1; |
| 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 = USB_STATUS_PASS; |
| u32 sd, sdinfo = 0; |
| |
| /* Wait for the next buffer to become available */ |
| bh = fsg->next_buffhd_to_fill; |
| while (bh->state != BUF_STATE_EMPTY) { |
| rc = sleep_thread(fsg); |
| if (rc) |
| return rc; |
| } |
| |
| if (curlun) { |
| sd = curlun->sense_data; |
| sdinfo = curlun->sense_data_info; |
| } else if (fsg->bad_lun_okay) |
| sd = SS_NO_SENSE; |
| else |
| sd = SS_LOGICAL_UNIT_NOT_SUPPORTED; |
| |
| if (fsg->phase_error) { |
| DBG(fsg, "sending phase-error status\n"); |
| status = USB_STATUS_PHASE_ERROR; |
| sd = SS_INVALID_COMMAND; |
| } else if (sd != SS_NO_SENSE) { |
| DBG(fsg, "sending command-failure status\n"); |
| status = USB_STATUS_FAIL; |
| VDBG(fsg, " sense data: SK x%02x, ASC x%02x, ASCQ x%02x;" |
| " info x%x\n", |
| SK(sd), ASC(sd), ASCQ(sd), sdinfo); |
| } |
| |
| if (transport_is_bbb()) { |
| struct bulk_cs_wrap *csw = bh->buf; |
| |
| /* Store and send the Bulk-only CSW */ |
| csw->Signature = cpu_to_le32(USB_BULK_CS_SIG); |
| csw->Tag = fsg->tag; |
| csw->Residue = cpu_to_le32(fsg->residue); |
| csw->Status = status; |
| |
| bh->inreq->length = USB_BULK_CS_WRAP_LEN; |
| bh->inreq->zero = 0; |
| start_transfer(fsg, fsg->bulk_in, bh->inreq, |
| &bh->inreq_busy, &bh->state); |
| |
| } else if (mod_data.transport_type == USB_PR_CB) { |
| |
| /* Control-Bulk transport has no status phase! */ |
| return 0; |
| |
| } else { // USB_PR_CBI |
| struct interrupt_data *buf = 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); |
| } else |
| fsg->lun = lun; // Use LUN from the command |
| |
| /* Check the LUN */ |
| if (fsg->lun < fsg->nluns) { |
| fsg->curlun = curlun = &fsg->luns[fsg->lun]; |
| if (fsg->cmnd[0] != REQUEST_SENSE) { |
| curlun->sense_data = SS_NO_SENSE; |
| curlun->sense_data_info = 0; |
| curlun->info_valid = 0; |
| } |
| } else { |
| fsg->curlun = curlun = NULL; |
| fsg->bad_lun_okay = 0; |
| |
| /* INQUIRY and REQUEST SENSE commands are explicitly allowed |
| * to use unsupported LUNs; all others may not. */ |
| if (fsg->cmnd[0] != 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; |
| } |
| |
| |
| 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) << 9; |
| if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST, |
| (7<<1) | (1<<4), 1, |
| "READ(6)")) == 0) |
| reply = do_read(fsg); |
| break; |
| |
| case READ_10: |
| fsg->data_size_from_cmnd = |
| get_unaligned_be16(&fsg->cmnd[7]) << 9; |
| if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST, |
| (1<<1) | (0xf<<2) | (3<<7), 1, |
| "READ(10)")) == 0) |
| reply = do_read(fsg); |
| break; |
| |
| case READ_12: |
| fsg->data_size_from_cmnd = |
| get_unaligned_be32(&fsg->cmnd[6]) << 9; |
| if ((reply = check_command(fsg, 12, DATA_DIR_TO_HOST, |
| (1<<1) | (0xf<<2) | (0xf<<6), 1, |
| "READ(12)")) == 0) |
| reply = do_read(fsg); |
| break; |
| |
| case 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) << 9; |
| if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST, |
| (7<<1) | (1<<4), 1, |
| "WRITE(6)")) == 0) |
| reply = do_write(fsg); |
| break; |
| |
| case WRITE_10: |
| fsg->data_size_from_cmnd = |
| get_unaligned_be16(&fsg->cmnd[7]) << 9; |
| if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST, |
| (1<<1) | (0xf<<2) | (3<<7), 1, |
| "WRITE(10)")) == 0) |
| reply = do_write(fsg); |
| break; |
| |
| case WRITE_12: |
| fsg->data_size_from_cmnd = |
| get_unaligned_be32(&fsg->cmnd[6]) << 9; |
| if ((reply = check_command(fsg, 12, DATA_DIR_FROM_HOST, |
| (1<<1) | (0xf<<2) | (0xf<<6), 1, |
| "WRITE(12)")) == 0) |
| reply = do_write(fsg); |
| break; |
| |
| /* Some mandatory commands that we recognize but don't implement. |
| * They don't mean much in this setting. It's left as an exercise |
| * for anyone interested to implement RESERVE and RELEASE in terms |
| * of Posix locks. */ |
| case 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, 0xff, 0, unknown)) == 0) { |
| fsg->curlun->sense_data = SS_INVALID_COMMAND; |
| reply = -EINVAL; |
| } |
| break; |
| } |
| up_read(&fsg->filesem); |
| |
| if (reply == -EINTR || signal_pending(current)) |
| return -EINTR; |
| |
| /* Set up the single reply buffer for finish_reply() */ |
| if (reply == -EINVAL) |
| reply = 0; // Error reply length |
| if (reply >= 0 && fsg->data_dir == DATA_DIR_TO_HOST) { |
| reply = min((u32) reply, fsg->data_size_from_cmnd); |
| bh->inreq->length = reply; |
| bh->state = BUF_STATE_FULL; |
| fsg->residue -= reply; |
| } // Otherwise it's already set |
| |
| return 0; |
| } |
| |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh) |
| { |
| struct usb_request *req = bh->outreq; |
| struct fsg_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 != USB_BULK_CB_WRAP_LEN || |
| cbw->Signature != cpu_to_le32( |
| USB_BULK_CB_SIG)) { |
| DBG(fsg, "invalid CBW: len %u sig 0x%x\n", |
| req->actual, |
| le32_to_cpu(cbw->Signature)); |
| |
| /* The Bulk-only spec says we MUST stall the 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 & ~USB_BULK_IN_FLAG || |
| cbw->Length <= 0 || cbw->Length > MAX_COMMAND_SIZE) { |
| DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, " |
| "cmdlen %u\n", |
| cbw->Lun, cbw->Flags, cbw->Length); |
| |
| /* We can do anything we want here, so let's stall the |
| * bulk pipes if we are allowed to. */ |
| if (mod_data.can_stall) { |
| fsg_set_halt(fsg, fsg->bulk_out); |
| halt_bulk_in_endpoint(fsg); |
| } |
| return -EINVAL; |
| } |
| |
| /* Save the command for later */ |
| fsg->cmnd_size = cbw->Length; |
| memcpy(fsg->cmnd, cbw->CDB, fsg->cmnd_size); |
| if (cbw->Flags & USB_BULK_IN_FLAG) |
| fsg->data_dir = DATA_DIR_TO_HOST; |
| else |
| fsg->data_dir = DATA_DIR_FROM_HOST; |
| fsg->data_size = le32_to_cpu(cbw->DataTransferLength); |
| if (fsg->data_size == 0) |
| fsg->data_dir = DATA_DIR_NONE; |
| fsg->lun = cbw->Lun; |
| fsg->tag = cbw->Tag; |
| return 0; |
| } |
| |
| |
| static int get_next_command(struct fsg_dev *fsg) |
| { |
| struct fsg_buffhd *bh; |
| int rc = 0; |
| |
| if (transport_is_bbb()) { |
| |
| /* Wait for the next buffer to become available */ |
| bh = fsg->next_buffhd_to_fill; |
| while (bh->state != BUF_STATE_EMPTY) { |
| rc = sleep_thread(fsg); |
| if (rc) |
| return rc; |
| } |
| |
| /* Queue a request to read a Bulk-only CBW */ |
| set_bulk_out_req_length(fsg, bh, USB_BULK_CB_WRAP_LEN); |
| bh->outreq->short_not_ok = 1; |
| 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); |
| } |
| return rc; |
| } |
| |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static int enable_endpoint(struct fsg_dev *fsg, struct usb_ep *ep, |
| const struct usb_endpoint_descriptor *d) |
| { |
| int rc; |
| |
| ep->driver_data = fsg; |
| rc = usb_ep_enable(ep, d); |
| if (rc) |
| ERROR(fsg, "can't enable %s, result %d\n", ep->name, rc); |
| return rc; |
| } |
| |
| static int alloc_request(struct fsg_dev *fsg, struct usb_ep *ep, |
| struct usb_request **preq) |
| { |
| *preq = usb_ep_alloc_request(ep, GFP_ATOMIC); |
| if (*preq) |
| return 0; |
| ERROR(fsg, "can't allocate request for %s\n", ep->name); |
| return -ENOMEM; |
| } |
| |
| /* |
| * Reset interface setting and re-init endpoint state (toggle etc). |
| * Call with altsetting < 0 to disable the interface. The only other |
| * available altsetting is 0, which enables the interface. |
| */ |
| static int do_set_interface(struct fsg_dev *fsg, int altsetting) |
| { |
| int rc = 0; |
| int i; |
| const struct usb_endpoint_descriptor *d; |
| |
| if (fsg->running) |
| DBG(fsg, "reset interface\n"); |
| |
| reset: |
| /* Deallocate the requests */ |
| for (i = 0; i < 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); |
| 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); |
| if ((rc = enable_endpoint(fsg, fsg->bulk_out, d)) != 0) |
| goto reset; |
| fsg->bulk_out_enabled = 1; |
| fsg->bulk_out_maxpacket = le16_to_cpu(d->wMaxPacketSize); |
| 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); |
| 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 { |
| char *speed; |
| |
| switch (fsg->gadget->speed) { |
| case USB_SPEED_LOW: speed = "low"; break; |
| case USB_SPEED_FULL: speed = "full"; break; |
| case USB_SPEED_HIGH: speed = "high"; break; |
| default: speed = "?"; break; |
| } |
| INFO(fsg, "%s speed config #%d\n", speed, fsg->config); |
| } |
| } |
| return rc; |
| } |
| |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static void handle_exception(struct fsg_dev *fsg) |
| { |
| siginfo_t info; |
| int sig; |
| int i; |
| int num_active; |
| struct fsg_buffhd *bh; |
| enum fsg_state old_state; |
| u8 new_config; |
| struct 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); |
| |
| /* 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; |
| } |
| } |
| |
| /* If the thread isn't already dead, tell it to exit now */ |
| if (fsg->state != FSG_STATE_TERMINATED) { |
| raise_exception(fsg, FSG_STATE_EXIT); |
| wait_for_completion(&fsg->thread_notifier); |
| |
| /* The cleanup routine waits for this completion also */ |
| complete(&fsg->thread_notifier); |
| } |
| |
| /* Free the data buffers */ |
| for (i = 0; i < 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; |
| int gcnum; |
| |
| /* 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) { // Parameter wasn't set |
| gcnum = usb_gadget_controller_number(fsg->gadget); |
| if (gcnum >= 0) |
| mod_data.release = 0x0300 + gcnum; |
| else { |
| WARNING(fsg, "controller '%s' not recognized\n", |
| fsg->gadget->name); |
| mod_data.release = 0x0399; |
| } |
| } |
| |
| prot = simple_strtol(mod_data.protocol_parm, NULL, 0); |
| |
| #ifdef CONFIG_USB_FILE_STORAGE_TEST |
| if (strnicmp(mod_data.transport_parm, "BBB", 10) == 0) { |
| ; // Use default setting |
| } else if (strnicmp(mod_data.transport_parm, "CB", 10) == 0) { |
| mod_data.transport_type = USB_PR_CB; |
| mod_data.transport_name = "Control-Bulk"; |
| } else if (strnicmp(mod_data.transport_parm, "CBI", 10) == 0) { |
| mod_data.transport_type = USB_PR_CBI; |
| mod_data.transport_name = "Control-Bulk-Interrupt"; |
| } else { |
| ERROR(fsg, "invalid transport: %s\n", mod_data.transport_parm); |
| return -EINVAL; |
| } |
| |
| if (strnicmp(mod_data.protocol_parm, "SCSI", 10) == 0 || |
| prot == USB_SC_SCSI) { |
| ; // Use default setting |
| } else if (strnicmp(mod_data.protocol_parm, "RBC", 10) == 0 || |
| prot == USB_SC_RBC) { |
| mod_data.protocol_type = USB_SC_RBC; |
| mod_data.protocol_name = "RBC"; |
| } else if (strnicmp(mod_data.protocol_parm, "8020", 4) == 0 || |
| strnicmp(mod_data.protocol_parm, "ATAPI", 10) == 0 || |
| prot == USB_SC_8020) { |
| mod_data.protocol_type = USB_SC_8020; |
| mod_data.protocol_name = "8020i (ATAPI)"; |
| } else if (strnicmp(mod_data.protocol_parm, "QIC", 3) == 0 || |
| prot == USB_SC_QIC) { |
| mod_data.protocol_type = USB_SC_QIC; |
| mod_data.protocol_name = "QIC-157"; |
| } else if (strnicmp(mod_data.protocol_parm, "UFI", 10) == 0 || |
| prot == USB_SC_UFI) { |
| mod_data.protocol_type = USB_SC_UFI; |
| mod_data.protocol_name = "UFI"; |
| } else if (strnicmp(mod_data.protocol_parm, "8070", 4) == 0 || |
| prot == USB_SC_8070) { |
| mod_data.protocol_type = USB_SC_8070; |
| mod_data.protocol_name = "8070i"; |
| } else { |
| ERROR(fsg, "invalid protocol: %s\n", mod_data.protocol_parm); |
| return -EINVAL; |
| } |
| |
| mod_data.buflen &= PAGE_CACHE_MASK; |
| if (mod_data.buflen <= 0) { |
| ERROR(fsg, "invalid buflen\n"); |
| return -ETOOSMALL; |
| } |
| |
| #endif /* CONFIG_USB_FILE_STORAGE_TEST */ |
| |
| /* 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 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.bMaxPacketSize0 = fsg->ep0->maxpacket; |
| device_desc.idVendor = cpu_to_le16(mod_data.vendor); |
| device_desc.idProduct = cpu_to_le16(mod_data.product); |
| device_desc.bcdDevice = cpu_to_le16(mod_data.release); |
| |
| i = (transport_is_cbi() ? 3 : 2); // Number of endpoints |
| 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 ep0 uses the same maxpacket value for both speeds */ |
| dev_qualifier.bMaxPacketSize0 = fsg->ep0->maxpacket; |
| |
| /* 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_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, "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 struct usb_gadget_driver fsg_driver = { |
| #ifdef CONFIG_USB_GADGET_DUALSPEED |
| .speed = USB_SPEED_HIGH, |
| #else |
| .speed = USB_SPEED_FULL, |
| #endif |
| .function = (char *) fsg_string_product, |
| .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, 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; |
| |
| if ((rc = fsg_alloc()) != 0) |
| return rc; |
| fsg = the_fsg; |
| if ((rc = usb_gadget_probe_driver(&fsg_driver, fsg_bind)) != 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); |