diff options
Diffstat (limited to 'drivers/staging/ccg/f_mass_storage.c')
| -rw-r--r-- | drivers/staging/ccg/f_mass_storage.c | 3135 |
1 files changed, 0 insertions, 3135 deletions
diff --git a/drivers/staging/ccg/f_mass_storage.c b/drivers/staging/ccg/f_mass_storage.c deleted file mode 100644 index 20bc2b454ac..00000000000 --- a/drivers/staging/ccg/f_mass_storage.c +++ /dev/null @@ -1,3135 +0,0 @@ -/* - * f_mass_storage.c -- Mass Storage USB Composite Function - * - * Copyright (C) 2003-2008 Alan Stern - * Copyright (C) 2009 Samsung Electronics - * Author: Michal Nazarewicz <mina86@mina86.com> - * 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 Mass Storage Function 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 composite - * function for a USB device, it also illustrates a technique of - * double-buffering for increased throughput. - * - * For more information about MSF and in particular its module - * parameters and sysfs interface read the - * <Documentation/usb/mass-storage.txt> file. - */ - -/* - * MSF is configured by specifying a fsg_config structure. It has the - * following fields: - * - * nluns Number of LUNs function have (anywhere from 1 - * to FSG_MAX_LUNS which is 8). - * luns An array of LUN configuration values. This - * should be filled for each LUN that - * function will include (ie. for "nluns" - * LUNs). Each element of the array has - * the following fields: - * ->filename The path to the backing file for the LUN. - * Required if LUN is not marked as - * removable. - * ->ro Flag specifying access to the LUN shall be - * read-only. This is implied if CD-ROM - * emulation is enabled as well as when - * it was impossible to open "filename" - * in R/W mode. - * ->removable Flag specifying that LUN shall be indicated as - * being removable. - * ->cdrom Flag specifying that LUN shall be reported as - * being a CD-ROM. - * ->nofua Flag specifying that FUA flag in SCSI WRITE(10,12) - * commands for this LUN shall be ignored. - * - * vendor_name - * product_name - * release Information used as a reply to INQUIRY - * request. To use default set to NULL, - * NULL, 0xffff respectively. The first - * field should be 8 and the second 16 - * characters or less. - * - * can_stall Set to permit function to halt bulk endpoints. - * Disabled on some USB devices known not - * to work correctly. You should set it - * to true. - * - * If "removable" is not set for a LUN then a backing file must be - * specified. If it is set, then NULL filename means the LUN's medium - * is not loaded (an empty string as "filename" in the fsg_config - * structure causes error). The CD-ROM emulation includes a single - * data track and no audio tracks; hence there need be only one - * backing file per LUN. - * - * This function is heavily based on "File-backed Storage Gadget" by - * Alan Stern which in turn 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 MSF 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. As of this moment, MSF - * provides no way to deregister the gadget when thread dies -- maybe - * a callback functions is needed. - * - * 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 <linux/usb/composite.h> - -#include "gadget_chips.h" - - -/*------------------------------------------------------------------------*/ - -#define FSG_DRIVER_DESC "Mass Storage Function" -#define FSG_DRIVER_VERSION "2009/09/11" - -static const char fsg_string_interface[] = "Mass Storage"; - -#define FSG_NO_DEVICE_STRINGS 1 -#define FSG_NO_OTG 1 -#define FSG_NO_INTR_EP 1 - -#include "storage_common.c" - - -/*-------------------------------------------------------------------------*/ - -struct fsg_dev; -struct fsg_common; - -/* FSF callback functions */ -struct fsg_operations { - /* - * Callback function to call when thread exits. If no - * callback is set or it returns value lower then zero MSF - * will force eject all LUNs it operates on (including those - * marked as non-removable or with prevent_medium_removal flag - * set). - */ - int (*thread_exits)(struct fsg_common *common); - - /* - * Called prior to ejection. Negative return means error, - * zero means to continue with ejection, positive means not to - * eject. - */ - int (*pre_eject)(struct fsg_common *common, - struct fsg_lun *lun, int num); - /* - * Called after ejection. Negative return means error, zero - * or positive is just a success. - */ - int (*post_eject)(struct fsg_common *common, - struct fsg_lun *lun, int num); -}; - -/* Data shared by all the FSG instances. */ -struct fsg_common { - struct usb_gadget *gadget; - struct usb_composite_dev *cdev; - struct fsg_dev *fsg, *new_fsg; - wait_queue_head_t fsg_wait; - - /* filesem protects: backing files in use */ - struct rw_semaphore filesem; - - /* lock protects: state, all the req_busy's */ - spinlock_t lock; - - struct usb_ep *ep0; /* Copy of gadget->ep0 */ - struct usb_request *ep0req; /* Copy of cdev->req */ - unsigned int ep0_req_tag; - - struct fsg_buffhd *next_buffhd_to_fill; - struct fsg_buffhd *next_buffhd_to_drain; - struct fsg_buffhd *buffhds; - - int cmnd_size; - u8 cmnd[MAX_COMMAND_SIZE]; - - unsigned int nluns; - unsigned int lun; - struct fsg_lun *luns; - struct fsg_lun *curlun; - - unsigned int bulk_out_maxpacket; - enum fsg_state state; /* For exception handling */ - unsigned int exception_req_tag; - - enum data_direction data_dir; - u32 data_size; - u32 data_size_from_cmnd; - u32 tag; - u32 residue; - u32 usb_amount_left; - - unsigned int can_stall:1; - unsigned int free_storage_on_release:1; - unsigned int phase_error:1; - unsigned int short_packet_received:1; - unsigned int bad_lun_okay:1; - unsigned int running:1; - - int thread_wakeup_needed; - struct completion thread_notifier; - struct task_struct *thread_task; - - /* Callback functions. */ - const struct fsg_operations *ops; - /* Gadget's private data. */ - void *private_data; - - /* - * Vendor (8 chars), product (16 chars), release (4 - * hexadecimal digits) and NUL byte - */ - char inquiry_string[8 + 16 + 4 + 1]; - - struct kref ref; -}; - -struct fsg_config { - unsigned nluns; - struct fsg_lun_config { - const char *filename; - char ro; - char removable; - char cdrom; - char nofua; - } luns[FSG_MAX_LUNS]; - - /* Callback functions. */ - const struct fsg_operations *ops; - /* Gadget's private data. */ - void *private_data; - - const char *vendor_name; /* 8 characters or less */ - const char *product_name; /* 16 characters or less */ - u16 release; - - char can_stall; -}; - -struct fsg_dev { - struct usb_function function; - struct usb_gadget *gadget; /* Copy of cdev->gadget */ - struct fsg_common *common; - - u16 interface_number; - - unsigned int bulk_in_enabled:1; - unsigned int bulk_out_enabled:1; - - unsigned long atomic_bitflags; -#define IGNORE_BULK_OUT 0 - - struct usb_ep *bulk_in; - struct usb_ep *bulk_out; -}; - -static inline int __fsg_is_set(struct fsg_common *common, - const char *func, unsigned line) -{ - if (common->fsg) - return 1; - ERROR(common, "common->fsg is NULL in %s at %u\n", func, line); - WARN_ON(1); - return 0; -} - -#define fsg_is_set(common) likely(__fsg_is_set(common, __func__, __LINE__)) - -static inline struct fsg_dev *fsg_from_func(struct usb_function *f) -{ - return container_of(f, struct fsg_dev, function); -} - -typedef void (*fsg_routine_t)(struct fsg_dev *); - -static int exception_in_progress(struct fsg_common *common) -{ - return common->state > FSG_STATE_IDLE; -} - -/* Make bulk-out requests be divisible by the maxpacket size */ -static void set_bulk_out_req_length(struct fsg_common *common, - struct fsg_buffhd *bh, unsigned int length) -{ - unsigned int rem; - - bh->bulk_out_intended_length = length; - rem = length % common->bulk_out_maxpacket; - if (rem > 0) - length += common->bulk_out_maxpacket - rem; - bh->outreq->length = length; -} - - -/*-------------------------------------------------------------------------*/ - -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); -} - - -/*-------------------------------------------------------------------------*/ - -/* These routines may be called in process context or in_irq */ - -/* Caller must hold fsg->lock */ -static void wakeup_thread(struct fsg_common *common) -{ - /* Tell the main thread that something has happened */ - common->thread_wakeup_needed = 1; - if (common->thread_task) - wake_up_process(common->thread_task); -} - -static void raise_exception(struct fsg_common *common, 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(&common->lock, flags); - if (common->state <= new_state) { - common->exception_req_tag = common->ep0_req_tag; - common->state = new_state; - if (common->thread_task) - send_sig_info(SIGUSR1, SEND_SIG_FORCED, - common->thread_task); - } - spin_unlock_irqrestore(&common->lock, flags); -} - - -/*-------------------------------------------------------------------------*/ - -static int ep0_queue(struct fsg_common *common) -{ - int rc; - - rc = usb_ep_queue(common->ep0, common->ep0req, GFP_ATOMIC); - common->ep0->driver_data = common; - if (rc != 0 && rc != -ESHUTDOWN) { - /* We can't do much more than wait for a reset */ - WARNING(common, "error in submission: %s --> %d\n", - common->ep0->name, rc); - } - return rc; -} - - -/*-------------------------------------------------------------------------*/ - -/* Completion handlers. These always run in_irq. */ - -static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req) -{ - struct fsg_common *common = ep->driver_data; - struct fsg_buffhd *bh = req->context; - - if (req->status || req->actual != req->length) - DBG(common, "%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(&common->lock); - bh->inreq_busy = 0; - bh->state = BUF_STATE_EMPTY; - wakeup_thread(common); - spin_unlock(&common->lock); -} - -static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req) -{ - struct fsg_common *common = ep->driver_data; - struct fsg_buffhd *bh = req->context; - - dump_msg(common, "bulk-out", req->buf, req->actual); - if (req->status || req->actual != bh->bulk_out_intended_length) - DBG(common, "%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(&common->lock); - bh->outreq_busy = 0; - bh->state = BUF_STATE_FULL; - wakeup_thread(common); - spin_unlock(&common->lock); -} - -static int fsg_setup(struct usb_function *f, - const struct usb_ctrlrequest *ctrl) -{ - struct fsg_dev *fsg = fsg_from_func(f); - struct usb_request *req = fsg->common->ep0req; - 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_is_set(fsg->common)) - return -EOPNOTSUPP; - - ++fsg->common->ep0_req_tag; /* Record arrival of a new request */ - req->context = NULL; - req->length = 0; - dump_msg(fsg, "ep0-setup", (u8 *) ctrl, sizeof(*ctrl)); - - switch (ctrl->bRequest) { - - case US_BULK_RESET_REQUEST: - if (ctrl->bRequestType != - (USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE)) - break; - if (w_index != fsg->interface_number || w_value != 0 || - w_length != 0) - return -EDOM; - - /* - * Raise an exception to stop the current operation - * and reinitialize our state. - */ - DBG(fsg, "bulk reset request\n"); - raise_exception(fsg->common, FSG_STATE_RESET); - return DELAYED_STATUS; - - case US_BULK_GET_MAX_LUN: - if (ctrl->bRequestType != - (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE)) - break; - if (w_index != fsg->interface_number || w_value != 0 || - w_length != 1) - return -EDOM; - VDBG(fsg, "get max LUN\n"); - *(u8 *)req->buf = fsg->common->nluns - 1; - - /* Respond with data/status */ - req->length = min((u16)1, w_length); - return ep0_queue(fsg->common); - } - - 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 -EOPNOTSUPP; -} - - -/*-------------------------------------------------------------------------*/ - -/* 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); - - spin_lock_irq(&fsg->common->lock); - *pbusy = 1; - *state = BUF_STATE_BUSY; - spin_unlock_irq(&fsg->common->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 bool start_in_transfer(struct fsg_common *common, struct fsg_buffhd *bh) -{ - if (!fsg_is_set(common)) - return false; - start_transfer(common->fsg, common->fsg->bulk_in, - bh->inreq, &bh->inreq_busy, &bh->state); - return true; -} - -static bool start_out_transfer(struct fsg_common *common, struct fsg_buffhd *bh) -{ - if (!fsg_is_set(common)) - return false; - start_transfer(common->fsg, common->fsg->bulk_out, - bh->outreq, &bh->outreq_busy, &bh->state); - return true; -} - -static int sleep_thread(struct fsg_common *common) -{ - 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 (common->thread_wakeup_needed) - break; - schedule(); - } - __set_current_state(TASK_RUNNING); - common->thread_wakeup_needed = 0; - return rc; -} - - -/*-------------------------------------------------------------------------*/ - -static int do_read(struct fsg_common *common) -{ - struct fsg_lun *curlun = common->curlun; - u32 lba; - struct fsg_buffhd *bh; - int rc; - u32 amount_left; - loff_t file_offset, file_offset_tmp; - unsigned int amount; - ssize_t nread; - - /* - * Get the starting Logical Block Address and check that it's - * not too big. - */ - if (common->cmnd[0] == READ_6) - lba = get_unaligned_be24(&common->cmnd[1]); - else { - lba = get_unaligned_be32(&common->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 ((common->cmnd[1] & ~0x18) != 0) { - curlun->sense_data = SS_INVALID_FIELD_IN_CDB; - return -EINVAL; - } - } - if (lba >= curlun->num_sectors) { - curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; - return -EINVAL; - } - file_offset = ((loff_t) lba) << curlun->blkbits; - - /* Carry out the file reads */ - amount_left = common->data_size_from_cmnd; - if (unlikely(amount_left == 0)) - return -EIO; /* No default reply */ - - for (;;) { - /* - * Figure out how much we need to read: - * Try to read the remaining amount. - * But don't read more than the buffer size. - * And don't try to read past the end of the file. - */ - amount = min(amount_left, FSG_BUFLEN); - amount = min((loff_t)amount, - curlun->file_length - file_offset); - - /* Wait for the next buffer to become available */ - bh = common->next_buffhd_to_fill; - while (bh->state != BUF_STATE_EMPTY) { - rc = sleep_thread(common); - if (rc) - return rc; - } - - /* - * If we were asked to read past the end of file, - * end with an empty buffer. - */ - if (amount == 0) { - curlun->sense_data = - SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; - curlun->sense_data_info = - file_offset >> curlun->blkbits; - curlun->info_valid = 1; - bh->inreq->length = 0; - bh->state = BUF_STATE_FULL; - break; - } - - /* Perform the read */ - file_offset_tmp = file_offset; - nread = vfs_read(curlun->filp, - (char __user *)bh->buf, - amount, &file_offset_tmp); - VLDBG(curlun, "file read %u @ %llu -> %d\n", amount, - (unsigned long long)file_offset, (int)nread); - if (signal_pending(current)) - return -EINTR; - - if (nread < 0) { - LDBG(curlun, "error in file read: %d\n", (int)nread); - nread = 0; - } else if (nread < amount) { - LDBG(curlun, "partial file read: %d/%u\n", - (int)nread, amount); - nread = round_down(nread, curlun->blksize); - } - file_offset += nread; - amount_left -= nread; - common->residue -= nread; - - /* - * Except at the end of the transfer, nread will be - * equal to the buffer size, which is divisible by the - * bulk-in maxpacket size. - */ - bh->inreq->length = nread; - bh->state = BUF_STATE_FULL; - - /* If an error occurred, report it and its position */ - if (nread < amount) { - curlun->sense_data = SS_UNRECOVERED_READ_ERROR; - curlun->sense_data_info = - file_offset >> curlun->blkbits; - curlun->info_valid = 1; - break; - } - - if (amount_left == 0) - break; /* No more left to read */ - - /* Send this buffer and go read some more */ - bh->inreq->zero = 0; - if (!start_in_transfer(common, bh)) - /* Don't know what to do if common->fsg is NULL */ - return -EIO; - common->next_buffhd_to_fill = bh->next; - } - - return -EIO; /* No default reply */ -} - - -/*-------------------------------------------------------------------------*/ - -static int do_write(struct fsg_common *common) -{ - struct fsg_lun *curlun = common->curlun; - u32 lba; - struct fsg_buffhd *bh; - int get_some_more; - u32 amount_left_to_req, amount_left_to_write; - loff_t usb_offset, file_offset, file_offset_tmp; - unsigned int amount; - ssize_t nwritten; - int rc; - - if (curlun->ro) { - curlun->sense_data = SS_WRITE_PROTECTED; - return -EINVAL; - } - spin_lock(&curlun->filp->f_lock); - curlun->filp->f_flags &= ~O_SYNC; /* Default is not to wait */ - spin_unlock(&curlun->filp->f_lock); - - /* - * Get the starting Logical Block Address and check that it's - * not too big - */ - if (common->cmnd[0] == WRITE_6) - lba = get_unaligned_be24(&common->cmnd[1]); - else { - lba = get_unaligned_be32(&common->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 (common->cmnd[1] & ~0x18) { - curlun->sense_data = SS_INVALID_FIELD_IN_CDB; - return -EINVAL; - } - if (!curlun->nofua && (common->cmnd[1] & 0x08)) { /* FUA */ - spin_lock(&curlun->filp->f_lock); - curlun->filp->f_flags |= O_SYNC; - spin_unlock(&curlun->filp->f_lock); - } - } - if (lba >= curlun->num_sectors) { - curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; - return -EINVAL; - } - - /* Carry out the file writes */ - get_some_more = 1; - file_offset = usb_offset = ((loff_t) lba) << curlun->blkbits; - amount_left_to_req = common->data_size_from_cmnd; - amount_left_to_write = common->data_size_from_cmnd; - - while (amount_left_to_write > 0) { - - /* Queue a request for more data from the host */ - bh = common->next_buffhd_to_fill; - if (bh->state == BUF_STATE_EMPTY && get_some_more) { - - /* - * Figure out how much we want to get: - * Try to get the remaining amount, - * but not more than the buffer size. - */ - amount = min(amount_left_to_req, FSG_BUFLEN); - - /* Beyond the end of the backing file? */ - if (usb_offset >= curlun->file_length) { - get_some_more = 0; - curlun->sense_data = - SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; - curlun->sense_data_info = - usb_offset >> curlun->blkbits; - curlun->info_valid = 1; - continue; - } - - /* Get the next buffer */ - usb_offset += amount; - common->usb_amount_left -= amount; - amount_left_to_req -= amount; - if (amount_left_to_req == 0) - get_some_more = 0; - - /* - * Except at the end of the transfer, amount will be - * equal to the buffer size, which is divisible by - * the bulk-out maxpacket size. - */ - set_bulk_out_req_length(common, bh, amount); - if (!start_out_transfer(common, bh)) - /* Dunno what to do if common->fsg is NULL */ - return -EIO; - common->next_buffhd_to_fill = bh->next; - continue; - } - - /* Write the received data to the backing file */ - bh = common->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(); - common->next_buffhd_to_drain = bh->next; - bh->state = BUF_STATE_EMPTY; - - /* Did something go wrong with the transfer? */ - if (bh->outreq->status != 0) { - curlun->sense_data = SS_COMMUNICATION_FAILURE; - curlun->sense_data_info = - file_offset >> curlun->blkbits; - curlun->info_valid = 1; - break; - } - - amount = bh->outreq->actual; - if (curlun->file_length - file_offset < amount) { - LERROR(curlun, - "write %u @ %llu beyond end %llu\n", - amount, (unsigned long long)file_offset, - (unsigned long long)curlun->file_length); - amount = curlun->file_length - file_offset; - } - - /* Don't accept excess data. The spec doesn't say - * what to do in this case. We'll ignore the error. - */ - amount = min(amount, bh->bulk_out_intended_length); - - /* Don't write a partial block */ - amount = round_down(amount, curlun->blksize); - if (amount == 0) - goto empty_write; - - /* Perform the write */ - file_offset_tmp = file_offset; - nwritten = vfs_write(curlun->filp, - (char __user *)bh->buf, - amount, &file_offset_tmp); - VLDBG(curlun, "file write %u @ %llu -> %d\n", amount, - (unsigned long long)file_offset, (int)nwritten); - if (signal_pending(current)) - return -EINTR; /* Interrupted! */ - - if (nwritten < 0) { - LDBG(curlun, "error in file write: %d\n", - (int)nwritten); - nwritten = 0; - } else if (nwritten < amount) { - LDBG(curlun, "partial file write: %d/%u\n", - (int)nwritten, amount); - nwritten = round_down(nwritten, curlun->blksize); - } - file_offset += nwritten; - amount_left_to_write -= nwritten; - common->residue -= nwritten; - - /* If an error occurred, report it and its position */ - if (nwritten < amount) { - curlun->sense_data = SS_WRITE_ERROR; - curlun->sense_data_info = - file_offset >> curlun->blkbits; - curlun->info_valid = 1; - break; - } - - empty_write: - /* Did the host decide to stop early? */ - if (bh->outreq->actual < bh->bulk_out_intended_length) { - common->short_packet_received = 1; - break; - } - continue; - } - - /* Wait for something to happen */ - rc = sleep_thread(common); - if (rc) - return rc; - } - - return -EIO; /* No default reply */ -} - - -/*-------------------------------------------------------------------------*/ - -static int do_synchronize_cache(struct fsg_common *common) -{ - struct fsg_lun *curlun = common->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 = file_inode(filp); - 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_common *common) -{ - struct fsg_lun *curlun = common->curlun; - u32 lba; - u32 verification_length; - struct fsg_buffhd *bh = common->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(&common->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 (common->cmnd[1] & ~0x10) { - curlun->sense_data = SS_INVALID_FIELD_IN_CDB; - return -EINVAL; - } - - verification_length = get_unaligned_be16(&common->cmnd[7]); - if (unlikely(verification_length == 0)) - return -EIO; /* No default reply */ - - /* Prepare to carry out the file verify */ - amount_left = verification_length << curlun->blkbits; - file_offset = ((loff_t) lba) << curlun->blkbits; - - /* Write out all the dirty buffers before invalidating them */ - fsg_lun_fsync_sub(curlun); - if (signal_pending(current)) - return -EINTR; - - invalidate_sub(curlun); - if (signal_pending(current)) - return -EINTR; - - /* Just try to read the requested blocks */ - while (amount_left > 0) { - /* - * Figure out how much we need to read: - * Try to read the remaining amount, but not more than - * the buffer size. - * And don't try to read past the end of the file. - */ - amount = min(amount_left, FSG_BUFLEN); - amount = min((loff_t)amount, - curlun->file_length - file_offset); - if (amount == 0) { - curlun->sense_data = - SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; - curlun->sense_data_info = - file_offset >> curlun->blkbits; - curlun->info_valid = 1; - break; - } - - /* Perform the read */ - file_offset_tmp = file_offset; - nread = vfs_read(curlun->filp, - (char __user *) bh->buf, - amount, &file_offset_tmp); - VLDBG(curlun, "file read %u @ %llu -> %d\n", amount, - (unsigned long long) file_offset, - (int) nread); - if (signal_pending(current)) - return -EINTR; - - if (nread < 0) { - LDBG(curlun, "error in file verify: %d\n", (int)nread); - nread = 0; - } else if (nread < amount) { - LDBG(curlun, "partial file verify: %d/%u\n", - (int)nread, amount); - nread = round_down(nread, curlun->blksize); - } - if (nread == 0) { - curlun->sense_data = SS_UNRECOVERED_READ_ERROR; - curlun->sense_data_info = - file_offset >> curlun->blkbits; - curlun->info_valid = 1; - break; - } - file_offset += nread; - amount_left -= nread; - } - return 0; -} - - -/*-------------------------------------------------------------------------*/ - -static int do_inquiry(struct fsg_common *common, struct fsg_buffhd *bh) -{ - struct fsg_lun *curlun = common->curlun; - u8 *buf = (u8 *) bh->buf; - - if (!curlun) { /* Unsupported LUNs are okay */ - common->bad_lun_okay = 1; - memset(buf, 0, 36); - buf[0] = 0x7f; /* Unsupported, no device-type */ - buf[4] = 31; /* Additional length */ - return 36; - } - - buf[0] = curlun->cdrom ? TYPE_ROM : TYPE_DISK; - buf[1] = curlun->removable ? 0x80 : 0; - buf[2] = 2; /* ANSI SCSI level 2 */ - buf[3] = 2; /* SCSI-2 INQUIRY data format */ - buf[4] = 31; /* Additional length */ - buf[5] = 0; /* No special options */ - buf[6] = 0; - buf[7] = 0; - memcpy(buf + 8, common->inquiry_string, sizeof common->inquiry_string); - return 36; -} - -static int do_request_sense(struct fsg_common *common, struct fsg_buffhd *bh) -{ - struct fsg_lun *curlun = common->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 */ - common->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_common *common, struct fsg_buffhd *bh) -{ - struct fsg_lun *curlun = common->curlun; - u32 lba = get_unaligned_be32(&common->cmnd[2]); - int pmi = common->cmnd[8]; - u8 *buf = (u8 *)bh->buf; - - /* Check the PMI and LBA fields */ - if (pmi > 1 || (pmi == 0 && lba != 0)) { - curlun->sense_data = SS_INVALID_FIELD_IN_CDB; - return -EINVAL; - } - - put_unaligned_be32(curlun->num_sectors - 1, &buf[0]); - /* Max logical block */ - put_unaligned_be32(curlun->blksize, &buf[4]);/* Block length */ - return 8; -} - -static int do_read_header(struct fsg_common *common, struct fsg_buffhd *bh) -{ - struct fsg_lun *curlun = common->curlun; - int msf = common->cmnd[1] & 0x02; - u32 lba = get_unaligned_be32(&common->cmnd[2]); - u8 *buf = (u8 *)bh->buf; - - if (common->cmnd[1] & ~0x02) { /* 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_common *common, struct fsg_buffhd *bh) -{ - struct fsg_lun *curlun = common->curlun; - int msf = common->cmnd[1] & 0x02; - int start_track = common->cmnd[6]; - u8 *buf = (u8 *)bh->buf; - - if ((common->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_common *common, struct fsg_buffhd *bh) -{ - struct fsg_lun *curlun = common->curlun; - int mscmnd = common->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 ((common->cmnd[1] & ~0x08) != 0) { /* Mask away DBD */ - curlun->sense_data = SS_INVALID_FIELD_IN_CDB; - return -EINVAL; - } - pc = common->cmnd[2] >> 6; - page_code = common->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 FSG_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_common *common) -{ - struct fsg_lun *curlun = common->curlun; - int loej, start; - - if (!curlun) { - return -EINVAL; - } else if (!curlun->removable) { - curlun->sense_data = SS_INVALID_COMMAND; - return -EINVAL; - } else if ((common->cmnd[1] & ~0x01) != 0 || /* Mask away Immed */ - (common->cmnd[4] & ~0x03) != 0) { /* Mask LoEj, Start */ - curlun->sense_data = SS_INVALID_FIELD_IN_CDB; - return -EINVAL; - } - - loej = common->cmnd[4] & 0x02; - start = common->cmnd[4] & 0x01; - - /* - * Our emulation doesn't support mounting; the medium is - * available for use as soon as it is loaded. - */ - if (start) { - if (!fsg_lun_is_open(curlun)) { - curlun->sense_data = SS_MEDIUM_NOT_PRESENT; - return -EINVAL; - } - return 0; - } - - /* 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) - return 0; - - /* Simulate an unload/eject */ - if (common->ops && common->ops->pre_eject) { - int r = common->ops->pre_eject(common, curlun, - curlun - common->luns); - if (unlikely(r < 0)) - return r; - else if (r) - return 0; - } - - up_read(&common->filesem); - down_write(&common->filesem); - fsg_lun_close(curlun); - up_write(&common->filesem); - down_read(&common->filesem); - - return common->ops && common->ops->post_eject - ? min(0, common->ops->post_eject(common, curlun, - curlun - common->luns)) - : 0; -} - -static int do_prevent_allow(struct fsg_common *common) -{ - struct fsg_lun *curlun = common->curlun; - int prevent; - - if (!common->curlun) { - return -EINVAL; - } else if (!common->curlun->removable) { - common->curlun->sense_data = SS_INVALID_COMMAND; - return -EINVAL; - } - - prevent = common->cmnd[4] & 0x01; - if ((common->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_common *common, - struct fsg_buffhd *bh) -{ - struct fsg_lun *curlun = common->curlun; - u8 *buf = (u8 *) bh->buf; - - buf[0] = buf[1] = buf[2] = 0; - buf[3] = 8; /* Only the Current/Maximum Capacity Descriptor */ - buf += 4; - - put_unaligned_be32(curlun->num_sectors, &buf[0]); - /* Number of blocks */ - put_unaligned_be32(curlun->blksize, &buf[4]);/* Block length */ - buf[4] = 0x02; /* Current capacity */ - return 12; -} - -static int do_mode_select(struct fsg_common *common, struct fsg_buffhd *bh) -{ - struct fsg_lun *curlun = common->curlun; - - /* We don't support MODE SELECT */ - if (curlun) - 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_common *common) -{ - struct fsg_buffhd *bh; - u32 amount; - int rc; - - for (bh = common->next_buffhd_to_drain; - bh->state != BUF_STATE_EMPTY || common->usb_amount_left > 0; - bh = common->next_buffhd_to_drain) { - - /* Throw away the data in a filled buffer */ - if (bh->state == BUF_STATE_FULL) { - smp_rmb(); - bh->state = BUF_STATE_EMPTY; - common->next_buffhd_to_drain = bh->next; - - /* A short packet or an error ends everything */ - if (bh->outreq->actual < bh->bulk_out_intended_length || - bh->outreq->status != 0) { - raise_exception(common, - FSG_STATE_ABORT_BULK_OUT); - return -EINTR; - } - continue; - } - - /* Try to submit another request if we need one */ - bh = common->next_buffhd_to_fill; - if (bh->state == BUF_STATE_EMPTY - && common->usb_amount_left > 0) { - amount = min(common->usb_amount_left, FSG_BUFLEN); - - /* - * Except at the end of the transfer, amount will be - * equal to the buffer size, which is divisible by - * the bulk-out maxpacket size. - */ - set_bulk_out_req_length(common, bh, amount); - if (!start_out_transfer(common, bh)) - /* Dunno what to do if common->fsg is NULL */ - return -EIO; - common->next_buffhd_to_fill = bh->next; - common->usb_amount_left -= amount; - continue; - } - - /* Otherwise wait for something to happen */ - rc = sleep_thread(common); - if (rc) - return rc; - } - return 0; -} - -static int finish_reply(struct fsg_common *common) -{ - struct fsg_buffhd *bh = common->next_buffhd_to_fill; - int rc = 0; - - switch (common->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 (!common->can_stall) { - /* Nothing */ - } else if (fsg_is_set(common)) { - fsg_set_halt(common->fsg, common->fsg->bulk_out); - rc = halt_bulk_in_endpoint(common->fsg); - } else { - /* Don't know what to do if common->fsg is NULL */ - rc = -EIO; - } - break; - - /* All but the last buffer of data must have already been sent */ - case DATA_DIR_TO_HOST: - if (common->data_size == 0) { - /* Nothing to send */ - - /* Don't know what to do if common->fsg is NULL */ - } else if (!fsg_is_set(common)) { - rc = -EIO; - - /* If there's no residue, simply send the last buffer */ - } else if (common->residue == 0) { - bh->inreq->zero = 0; - if (!start_in_transfer(common, bh)) - return -EIO; - common->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; - if (!start_in_transfer(common, bh)) - rc = -EIO; - common->next_buffhd_to_fill = bh->next; - if (common->can_stall) - rc = halt_bulk_in_endpoint(common->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 (common->residue == 0) { - /* Nothing to receive */ - - /* Did the host stop sending unexpectedly early? */ - } else if (common->short_packet_received) { - raise_exception(common, 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 (common->can_stall) { - if (fsg_is_set(common)) - fsg_set_halt(common->fsg, - common->fsg->bulk_out); - raise_exception(common, 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(common); - } - break; - } - return rc; -} - -static int send_status(struct fsg_common *common) -{ - struct fsg_lun *curlun = common->curlun; - struct fsg_buffhd *bh; - struct bulk_cs_wrap *csw; - int rc; - u8 status = US_BULK_STAT_OK; - u32 sd, sdinfo = 0; - - /* Wait for the next buffer to become available */ - bh = common->next_buffhd_to_fill; - while (bh->state != BUF_STATE_EMPTY) { - rc = sleep_thread(common); - if (rc) - return rc; - } - - if (curlun) { - sd = curlun->sense_data; - sdinfo = curlun->sense_data_info; - } else if (common->bad_lun_okay) - sd = SS_NO_SENSE; - else - sd = SS_LOGICAL_UNIT_NOT_SUPPORTED; - - if (common->phase_error) { - DBG(common, "sending phase-error status\n"); - status = US_BULK_STAT_PHASE; - sd = SS_INVALID_COMMAND; - } else if (sd != SS_NO_SENSE) { - DBG(common, "sending command-failure status\n"); - status = US_BULK_STAT_FAIL; - VDBG(common, " sense data: SK x%02x, ASC x%02x, ASCQ x%02x;" - " info x%x\n", - SK(sd), ASC(sd), ASCQ(sd), sdinfo); - } - - /* Store and send the Bulk-only CSW */ - csw = (void *)bh->buf; - - csw->Signature = cpu_to_le32(US_BULK_CS_SIGN); - csw->Tag = common->tag; - csw->Residue = cpu_to_le32(common->residue); - csw->Status = status; - - bh->inreq->length = US_BULK_CS_WRAP_LEN; - bh->inreq->zero = 0; - if (!start_in_transfer(common, bh)) - /* Don't know what to do if common->fsg is NULL */ - return -EIO; - - common->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_common *common, int cmnd_size, - enum data_direction data_dir, unsigned int mask, - int needs_medium, const char *name) -{ - int i; - int lun = common->cmnd[1] >> 5; - static const char dirletter[4] = {'u', 'o', 'i', 'n'}; - char hdlen[20]; - struct fsg_lun *curlun; - - hdlen[0] = 0; - if (common->data_dir != DATA_DIR_UNKNOWN) - sprintf(hdlen, ", H%c=%u", dirletter[(int) common->data_dir], - common->data_size); - VDBG(common, "SCSI command: %s; Dc=%d, D%c=%u; Hc=%d%s\n", - name, cmnd_size, dirletter[(int) data_dir], - common->data_size_from_cmnd, common->cmnd_size, hdlen); - - /* - * We can't reply at all until we know the correct data direction - * and size. - */ - if (common->data_size_from_cmnd == 0) - data_dir = DATA_DIR_NONE; - if (common->data_size < common->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. - */ - common->data_size_from_cmnd = common->data_size; - common->phase_error = 1; - } - common->residue = common->data_size; - common->usb_amount_left = common->data_size; - - /* Conflicting data directions is a phase error */ - if (common->data_dir != data_dir && common->data_size_from_cmnd > 0) { - common->phase_error = 1; - return -EINVAL; - } - - /* Verify the length of the command itself */ - if (cmnd_size != common->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 <= common->cmnd_size) { - DBG(common, "%s is buggy! Expected length %d " - "but we got %d\n", name, - cmnd_size, common->cmnd_size); - cmnd_size = common->cmnd_size; - } else { - common->phase_error = 1; - return -EINVAL; - } - } - - /* Check that the LUN values are consistent */ - if (common->lun != lun) - DBG(common, "using LUN %d from CBW, not LUN %d from CDB\n", - common->lun, lun); - - /* Check the LUN */ - curlun = common->curlun; - if (curlun) { - if (common->cmnd[0] != REQUEST_SENSE) { - curlun->sense_data = SS_NO_SENSE; - curlun->sense_data_info = 0; - curlun->info_valid = 0; - } - } else { - common->bad_lun_okay = 0; - - /* - * INQUIRY and REQUEST SENSE commands are explicitly allowed - * to use unsupported LUNs; all others may not. - */ - if (common->cmnd[0] != INQUIRY && - common->cmnd[0] != REQUEST_SENSE) { - DBG(common, "unsupported LUN %d\n", common->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 && - common->cmnd[0] != INQUIRY && - common->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 */ - common->cmnd[1] &= 0x1f; /* Mask away the LUN */ - for (i = 1; i < cmnd_size; ++i) { - if (common->cmnd[i] && !(mask & (1 << i))) { - if (curlun) - curlun->sense_data = SS_INVALID_FIELD_IN_CDB; - return -EINVAL; - } - } - - /* If the medium isn't mounted and the command needs to access - * it, return an error. */ - if (curlun && !fsg_lun_is_open(curlun) && needs_medium) { - curlun->sense_data = SS_MEDIUM_NOT_PRESENT; - return -EINVAL; - } - - return 0; -} - -/* wrapper of check_command for data size in blocks handling */ -static int check_command_size_in_blocks(struct fsg_common *common, - int cmnd_size, enum data_direction data_dir, - unsigned int mask, int needs_medium, const char *name) -{ - if (common->curlun) - common->data_size_from_cmnd <<= common->curlun->blkbits; - return check_command(common, cmnd_size, data_dir, - mask, needs_medium, name); -} - -static int do_scsi_command(struct fsg_common *common) -{ - struct fsg_buffhd *bh; - int rc; - int reply = -EINVAL; - int i; - static char unknown[16]; - - dump_cdb(common); - - /* Wait for the next buffer to become available for data or status */ - bh = common->next_buffhd_to_fill; - common->next_buffhd_to_drain = bh; - while (bh->state != BUF_STATE_EMPTY) { - rc = sleep_thread(common); - if (rc) - return rc; - } - common->phase_error = 0; - common->short_packet_received = 0; - - down_read(&common->filesem); /* We're using the backing file */ - switch (common->cmnd[0]) { - - case INQUIRY: - common->data_size_from_cmnd = common->cmnd[4]; - reply = check_command(common, 6, DATA_DIR_TO_HOST, - (1<<4), 0, - "INQUIRY"); - if (reply == 0) - reply = do_inquiry(common, bh); - break; - - case MODE_SELECT: - common->data_size_from_cmnd = common->cmnd[4]; - reply = check_command(common, 6, DATA_DIR_FROM_HOST, - (1<<1) | (1<<4), 0, - "MODE SELECT(6)"); - if (reply == 0) - reply = do_mode_select(common, bh); - break; - - case MODE_SELECT_10: - common->data_size_from_cmnd = - get_unaligned_be16(&common->cmnd[7]); - reply = check_command(common, 10, DATA_DIR_FROM_HOST, - (1<<1) | (3<<7), 0, - "MODE SELECT(10)"); - if (reply == 0) - reply = do_mode_select(common, bh); - break; - - case MODE_SENSE: - common->data_size_from_cmnd = common->cmnd[4]; - reply = check_command(common, 6, DATA_DIR_TO_HOST, - (1<<1) | (1<<2) | (1<<4), 0, - "MODE SENSE(6)"); - if (reply == 0) - reply = do_mode_sense(common, bh); - break; - - case MODE_SENSE_10: - common->data_size_from_cmnd = - get_unaligned_be16(&common->cmnd[7]); - reply = check_command(common, 10, DATA_DIR_TO_HOST, - (1<<1) | (1<<2) | (3<<7), 0, - "MODE SENSE(10)"); - if (reply == 0) - reply = do_mode_sense(common, bh); - break; - - case ALLOW_MEDIUM_REMOVAL: - common->data_size_from_cmnd = 0; - reply = check_command(common, 6, DATA_DIR_NONE, - (1<<4), 0, - "PREVENT-ALLOW MEDIUM REMOVAL"); - if (reply == 0) - reply = do_prevent_allow(common); - break; - - case READ_6: - i = common->cmnd[4]; - common->data_size_from_cmnd = (i == 0) ? 256 : i; - reply = check_command_size_in_blocks(common, 6, - DATA_DIR_TO_HOST, - (7<<1) | (1<<4), 1, - "READ(6)"); - if (reply == 0) - reply = do_read(common); - break; - - case READ_10: - common->data_size_from_cmnd = - get_unaligned_be16(&common->cmnd[7]); - reply = check_command_size_in_blocks(common, 10, - DATA_DIR_TO_HOST, - (1<<1) | (0xf<<2) | (3<<7), 1, - "READ(10)"); - if (reply == 0) - reply = do_read(common); - break; - - case READ_12: - common->data_size_from_cmnd = - get_unaligned_be32(&common->cmnd[6]); - reply = check_command_size_in_blocks(common, 12, - DATA_DIR_TO_HOST, - (1<<1) | (0xf<<2) | (0xf<<6), 1, - "READ(12)"); - if (reply == 0) - reply = do_read(common); - break; - - case READ_CAPACITY: - common->data_size_from_cmnd = 8; - reply = check_command(common, 10, DATA_DIR_TO_HOST, - (0xf<<2) | (1<<8), 1, - "READ CAPACITY"); - if (reply == 0) - reply = do_read_capacity(common, bh); - break; - - case READ_HEADER: - if (!common->curlun || !common->curlun->cdrom) - goto unknown_cmnd; - common->data_size_from_cmnd = - get_unaligned_be16(&common->cmnd[7]); - reply = check_command(common, 10, DATA_DIR_TO_HOST, - (3<<7) | (0x1f<<1), 1, - "READ HEADER"); - if (reply == 0) - reply = do_read_header(common, bh); - break; - - case READ_TOC: - if (!common->curlun || !common->curlun->cdrom) - goto unknown_cmnd; - common->data_size_from_cmnd = - get_unaligned_be16(&common->cmnd[7]); - reply = check_command(common, 10, DATA_DIR_TO_HOST, - (7<<6) | (1<<1), 1, - "READ TOC"); - if (reply == 0) - reply = do_read_toc(common, bh); - break; - - case READ_FORMAT_CAPACITIES: - common->data_size_from_cmnd = - get_unaligned_be16(&common->cmnd[7]); - reply = check_command(common, 10, DATA_DIR_TO_HOST, - (3<<7), 1, - "READ FORMAT CAPACITIES"); - if (reply == 0) - reply = do_read_format_capacities(common, bh); - break; - - case REQUEST_SENSE: - common->data_size_from_cmnd = common->cmnd[4]; - reply = check_command(common, 6, DATA_DIR_TO_HOST, - (1<<4), 0, - "REQUEST SENSE"); - if (reply == 0) - reply = do_request_sense(common, bh); - break; - - case START_STOP: - common->data_size_from_cmnd = 0; - reply = check_command(common, 6, DATA_DIR_NONE, - (1<<1) | (1<<4), 0, - "START-STOP UNIT"); - if (reply == 0) - reply = do_start_stop(common); - break; - - case SYNCHRONIZE_CACHE: - common->data_size_from_cmnd = 0; - reply = check_command(common, 10, DATA_DIR_NONE, - (0xf<<2) | (3<<7), 1, - "SYNCHRONIZE CACHE"); - if (reply == 0) - reply = do_synchronize_cache(common); - break; - - case TEST_UNIT_READY: - common->data_size_from_cmnd = 0; - reply = check_command(common, 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: - common->data_size_from_cmnd = 0; - reply = check_command(common, 10, DATA_DIR_NONE, - (1<<1) | (0xf<<2) | (3<<7), 1, - "VERIFY"); - if (reply == 0) - reply = do_verify(common); - break; - - case WRITE_6: - i = common->cmnd[4]; - common->data_size_from_cmnd = (i == 0) ? 256 : i; - reply = check_command_size_in_blocks(common, 6, - DATA_DIR_FROM_HOST, - (7<<1) | (1<<4), 1, - "WRITE(6)"); - if (reply == 0) - reply = do_write(common); - break; - - case WRITE_10: - common->data_size_from_cmnd = - get_unaligned_be16(&common->cmnd[7]); - reply = check_command_size_in_blocks(common, 10, - DATA_DIR_FROM_HOST, - (1<<1) | (0xf<<2) | (3<<7), 1, - "WRITE(10)"); - if (reply == 0) - reply = do_write(common); - break; - - case WRITE_12: - common->data_size_from_cmnd = - get_unaligned_be32(&common->cmnd[6]); - reply = check_command_size_in_blocks(common, 12, - DATA_DIR_FROM_HOST, - (1<<1) | (0xf<<2) | (0xf<<6), 1, - "WRITE(12)"); - if (reply == 0) - reply = do_write(common); - 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: - common->data_size_from_cmnd = 0; - sprintf(unknown, "Unknown x%02x", common->cmnd[0]); - reply = check_command(common, common->cmnd_size, - DATA_DIR_UNKNOWN, ~0, 0, unknown); - if (reply == 0) { - common->curlun->sense_data = SS_INVALID_COMMAND; - reply = -EINVAL; - } - break; - } - up_read(&common->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 && common->data_dir == DATA_DIR_TO_HOST) { - reply = min((u32)reply, common->data_size_from_cmnd); - bh->inreq->length = reply; - bh->state = BUF_STATE_FULL; - common->residue -= reply; - } /* Otherwise it's already set */ - - return 0; -} - - -/*-------------------------------------------------------------------------*/ - -static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh) -{ - struct usb_request *req = bh->outreq; - struct bulk_cb_wrap *cbw = req->buf; - struct fsg_common *common = fsg->common; - - /* Was this a real packet? Should it be ignored? */ - if (req->status || test_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags)) - return -EINVAL; - - /* Is the CBW valid? */ - if (req->actual != US_BULK_CB_WRAP_LEN || - cbw->Signature != cpu_to_le32( - US_BULK_CB_SIGN)) { - DBG(fsg, "invalid CBW: len %u sig 0x%x\n", - req->actual, - le32_to_cpu(cbw->Signature)); - - /* - * The Bulk-only spec says we MUST stall the IN endpoint - * (6.6.1), so it's unavoidable. It also says we must - * retain this state until the next reset, but there's - * no way to tell the controller driver it should ignore - * Clear-Feature(HALT) requests. - * - * We aren't required to halt the OUT endpoint; instead - * we can simply accept and discard any data received - * until the next reset. - */ - wedge_bulk_in_endpoint(fsg); - set_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags); - return -EINVAL; - } - - /* Is the CBW meaningful? */ - if (cbw->Lun >= FSG_MAX_LUNS || cbw->Flags & ~US_BULK_FLAG_IN || - cbw->Length <= 0 || cbw->Length > MAX_COMMAND_SIZE) { - DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, " - "cmdlen %u\n", - cbw->Lun, cbw->Flags, cbw->Length); - - /* - * We can do anything we want here, so let's stall the - * bulk pipes if we are allowed to. - */ - if (common->can_stall) { - fsg_set_halt(fsg, fsg->bulk_out); - halt_bulk_in_endpoint(fsg); - } - return -EINVAL; - } - - /* Save the command for later */ - common->cmnd_size = cbw->Length; - memcpy(common->cmnd, cbw->CDB, common->cmnd_size); - if (cbw->Flags & US_BULK_FLAG_IN) - common->data_dir = DATA_DIR_TO_HOST; - else - common->data_dir = DATA_DIR_FROM_HOST; - common->data_size = le32_to_cpu(cbw->DataTransferLength); - if (common->data_size == 0) - common->data_dir = DATA_DIR_NONE; - common->lun = cbw->Lun; - if (common->lun >= 0 && common->lun < common->nluns) - common->curlun = &common->luns[common->lun]; - else - common->curlun = NULL; - common->tag = cbw->Tag; - return 0; -} - -static int get_next_command(struct fsg_common *common) -{ - struct fsg_buffhd *bh; - int rc = 0; - - /* Wait for the next buffer to become available */ - bh = common->next_buffhd_to_fill; - while (bh->state != BUF_STATE_EMPTY) { - rc = sleep_thread(common); - if (rc) - return rc; - } - - /* Queue a request to read a Bulk-only CBW */ - set_bulk_out_req_length(common, bh, US_BULK_CB_WRAP_LEN); - if (!start_out_transfer(common, bh)) - /* Don't know what to do if common->fsg is NULL */ - return -EIO; - - /* - * 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(common); - if (rc) - return rc; - } - smp_rmb(); - rc = fsg_is_set(common) ? received_cbw(common->fsg, bh) : -EIO; - bh->state = BUF_STATE_EMPTY; - - return rc; -} - - -/*-------------------------------------------------------------------------*/ - -static int alloc_request(struct fsg_common *common, struct usb_ep *ep, - struct usb_request **preq) -{ - *preq = usb_ep_alloc_request(ep, GFP_ATOMIC); - if (*preq) - return 0; - ERROR(common, "can't allocate request for %s\n", ep->name); - return -ENOMEM; -} - -/* Reset interface setting and re-init endpoint state (toggle etc). */ -static int do_set_interface(struct fsg_common *common, struct fsg_dev *new_fsg) -{ - struct fsg_dev *fsg; - int i, rc = 0; - - if (common->running) - DBG(common, "reset interface\n"); - -reset: - /* Deallocate the requests */ - if (common->fsg) { - fsg = common->fsg; - - for (i = 0; i < fsg_num_buffers; ++i) { - struct fsg_buffhd *bh = &common->buffhds[i]; - - if (bh->inreq) { - usb_ep_free_request(fsg->bulk_in, bh->inreq); - bh->inreq = NULL; - } - if (bh->outreq) { - usb_ep_free_request(fsg->bulk_out, bh->outreq); - bh->outreq = NULL; - } - } - - /* Disable the endpoints */ - if (fsg->bulk_in_enabled) { - 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; - } - - common->fsg = NULL; - wake_up(&common->fsg_wait); - } - - common->running = 0; - if (!new_fsg || rc) - return rc; - - common->fsg = new_fsg; - fsg = common->fsg; - - /* Enable the endpoints */ - rc = config_ep_by_speed(common->gadget, &(fsg->function), fsg->bulk_in); - if (rc) - goto reset; - rc = usb_ep_enable(fsg->bulk_in); - if (rc) - goto reset; - fsg->bulk_in->driver_data = common; - fsg->bulk_in_enabled = 1; - - rc = config_ep_by_speed(common->gadget, &(fsg->function), - fsg->bulk_out); - if (rc) - goto reset; - rc = usb_ep_enable(fsg->bulk_out); - if (rc) - goto reset; - fsg->bulk_out->driver_data = common; - fsg->bulk_out_enabled = 1; - common->bulk_out_maxpacket = usb_endpoint_maxp(fsg->bulk_out->desc); - clear_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags); - - /* Allocate the requests */ - for (i = 0; i < fsg_num_buffers; ++i) { - struct fsg_buffhd *bh = &common->buffhds[i]; - - rc = alloc_request(common, fsg->bulk_in, &bh->inreq); - if (rc) - goto reset; - rc = alloc_request(common, fsg->bulk_out, &bh->outreq); - if (rc) - 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; - } - - common->running = 1; - for (i = 0; i < common->nluns; ++i) - common->luns[i].unit_attention_data = SS_RESET_OCCURRED; - return rc; -} - - -/****************************** ALT CONFIGS ******************************/ - -static int fsg_set_alt(struct usb_function *f, unsigned intf, unsigned alt) -{ - struct fsg_dev *fsg = fsg_from_func(f); - fsg->common->new_fsg = fsg; - raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE); - return USB_GADGET_DELAYED_STATUS; -} - -static void fsg_disable(struct usb_function *f) -{ - struct fsg_dev *fsg = fsg_from_func(f); - fsg->common->new_fsg = NULL; - raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE); -} - - -/*-------------------------------------------------------------------------*/ - -static void handle_exception(struct fsg_common *common) -{ - siginfo_t info; - int i; - struct fsg_buffhd *bh; - enum fsg_state old_state; - struct fsg_lun *curlun; - unsigned int exception_req_tag; - - /* - * Clear the existing signals. Anything but SIGUSR1 is converted - * into a high-priority EXIT exception. - */ - for (;;) { - int sig = - dequeue_signal_lock(current, ¤t->blocked, &info); - if (!sig) - break; - if (sig != SIGUSR1) { - if (common->state < FSG_STATE_EXIT) - DBG(common, "Main thread exiting on signal\n"); - raise_exception(common, FSG_STATE_EXIT); - } - } - - /* Cancel all the pending transfers */ - if (likely(common->fsg)) { - for (i = 0; i < fsg_num_buffers; ++i) { - bh = &common->buffhds[i]; - if (bh->inreq_busy) - usb_ep_dequeue(common->fsg->bulk_in, bh->inreq); - if (bh->outreq_busy) - usb_ep_dequeue(common->fsg->bulk_out, - bh->outreq); - } - - /* Wait until everything is idle */ - for (;;) { - int num_active = 0; - for (i = 0; i < fsg_num_buffers; ++i) { - bh = &common->buffhds[i]; - num_active += bh->inreq_busy + bh->outreq_busy; - } - if (num_active == 0) - break; - if (sleep_thread(common)) - return; - } - - /* Clear out the controller's fifos */ - if (common->fsg->bulk_in_enabled) - usb_ep_fifo_flush(common->fsg->bulk_in); - if (common->fsg->bulk_out_enabled) - usb_ep_fifo_flush(common->fsg->bulk_out); - } - - /* - * Reset the I/O buffer states and pointers, the SCSI - * state, and the exception. Then invoke the handler. - */ - spin_lock_irq(&common->lock); - - for (i = 0; i < fsg_num_buffers; ++i) { - bh = &common->buffhds[i]; - bh->state = BUF_STATE_EMPTY; - } - common->next_buffhd_to_fill = &common->buffhds[0]; - common->next_buffhd_to_drain = &common->buffhds[0]; - exception_req_tag = common->exception_req_tag; - old_state = common->state; - - if (old_state == FSG_STATE_ABORT_BULK_OUT) - common->state = FSG_STATE_STATUS_PHASE; - else { - for (i = 0; i < common->nluns; ++i) { - curlun = &common->luns[i]; - curlun->prevent_medium_removal = 0; - curlun->sense_data = SS_NO_SENSE; - curlun->unit_attention_data = SS_NO_SENSE; - curlun->sense_data_info = 0; - curlun->info_valid = 0; - } - common->state = FSG_STATE_IDLE; - } - spin_unlock_irq(&common->lock); - - /* Carry out any extra actions required for the exception */ - switch (old_state) { - case FSG_STATE_ABORT_BULK_OUT: - send_status(common); - spin_lock_irq(&common->lock); - if (common->state == FSG_STATE_STATUS_PHASE) - common->state = FSG_STATE_IDLE; - spin_unlock_irq(&common->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 (!fsg_is_set(common)) - break; - if (test_and_clear_bit(IGNORE_BULK_OUT, - &common->fsg->atomic_bitflags)) - usb_ep_clear_halt(common->fsg->bulk_in); - - if (common->ep0_req_tag == exception_req_tag) - ep0_queue(common); /* Complete the status stage */ - - /* - * 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 < common->nluns; ++i) */ - /* common->luns[i].unit_attention_data = */ - /* SS_RESET_OCCURRED; */ - break; - - case FSG_STATE_CONFIG_CHANGE: - do_set_interface(common, common->new_fsg); - if (common->new_fsg) - usb_composite_setup_continue(common->cdev); - break; - - case FSG_STATE_EXIT: - case FSG_STATE_TERMINATED: - do_set_interface(common, NULL); /* Free resources */ - spin_lock_irq(&common->lock); - common->state = FSG_STATE_TERMINATED; /* Stop the thread */ - spin_unlock_irq(&common->lock); - break; - - case FSG_STATE_INTERFACE_CHANGE: - case FSG_STATE_DISCONNECT: - case FSG_STATE_COMMAND_PHASE: - case FSG_STATE_DATA_PHASE: - case FSG_STATE_STATUS_PHASE: - case FSG_STATE_IDLE: - break; - } -} - - -/*-------------------------------------------------------------------------*/ - -static int fsg_main_thread(void *common_) -{ - struct fsg_common *common = common_; - - /* - * 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 (common->state != FSG_STATE_TERMINATED) { - if (exception_in_progress(common) || signal_pending(current)) { - handle_exception(common); - continue; - } - - if (!common->running) { - sleep_thread(common); - continue; - } - - if (get_next_command(common)) - continue; - - spin_lock_irq(&common->lock); - if (!exception_in_progress(common)) - common->state = FSG_STATE_DATA_PHASE; - spin_unlock_irq(&common->lock); - - if (do_scsi_command(common) || finish_reply(common)) - continue; - - spin_lock_irq(&common->lock); - if (!exception_in_progress(common)) - common->state = FSG_STATE_STATUS_PHASE; - spin_unlock_irq(&common->lock); - - if (send_status(common)) - continue; - - spin_lock_irq(&common->lock); - if (!exception_in_progress(common)) - common->state = FSG_STATE_IDLE; - spin_unlock_irq(&common->lock); - } - - spin_lock_irq(&common->lock); - common->thread_task = NULL; - spin_unlock_irq(&common->lock); - - if (!common->ops || !common->ops->thread_exits - || common->ops->thread_exits(common) < 0) { - struct fsg_lun *curlun = common->luns; - unsigned i = common->nluns; - - down_write(&common->filesem); - for (; i--; ++curlun) { - if (!fsg_lun_is_open(curlun)) - continue; - - fsg_lun_close(curlun); - curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT; - } - up_write(&common->filesem); - } - - /* Let fsg_unbind() know the thread has exited */ - complete_and_exit(&common->thread_notifier, 0); -} - - -/*************************** DEVICE ATTRIBUTES ***************************/ - -static DEVICE_ATTR(ro, 0644, fsg_show_ro, fsg_store_ro); -static DEVICE_ATTR(nofua, 0644, fsg_show_nofua, fsg_store_nofua); -static DEVICE_ATTR(file, 0644, fsg_show_file, fsg_store_file); - -static struct device_attribute dev_attr_ro_cdrom = - __ATTR(ro, 0444, fsg_show_ro, NULL); -static struct device_attribute dev_attr_file_nonremovable = - __ATTR(file, 0444, fsg_show_file, NULL); - - -/****************************** FSG COMMON ******************************/ - -static void fsg_common_release(struct kref *ref); - -static void fsg_lun_release(struct device *dev) -{ - /* Nothing needs to be done */ -} - -static inline void fsg_common_get(struct fsg_common *common) -{ - kref_get(&common->ref); -} - -static inline void fsg_common_put(struct fsg_common *common) -{ - kref_put(&common->ref, fsg_common_release); -} - -static struct fsg_common *fsg_common_init(struct fsg_common *common, - struct usb_composite_dev *cdev, - struct fsg_config *cfg) -{ - struct usb_gadget *gadget = cdev->gadget; - struct fsg_buffhd *bh; - struct fsg_lun *curlun; - struct fsg_lun_config *lcfg; - int nluns, i, rc; - char *pathbuf; - - rc = fsg_num_buffers_validate(); - if (rc != 0) - return ERR_PTR(rc); - - /* Find out how many LUNs there should be */ - nluns = cfg->nluns; - if (nluns < 1 || nluns > FSG_MAX_LUNS) { - dev_err(&gadget->dev, "invalid number of LUNs: %u\n", nluns); - return ERR_PTR(-EINVAL); - } - - /* Allocate? */ - if (!common) { - common = kzalloc(sizeof *common, GFP_KERNEL); - if (!common) - return ERR_PTR(-ENOMEM); - common->free_storage_on_release = 1; - } else { - memset(common, 0, sizeof *common); - common->free_storage_on_release = 0; - } - - common->buffhds = kcalloc(fsg_num_buffers, - sizeof *(common->buffhds), GFP_KERNEL); - if (!common->buffhds) { - if (common->free_storage_on_release) - kfree(common); - return ERR_PTR(-ENOMEM); - } - - common->ops = cfg->ops; - common->private_data = cfg->private_data; - - common->gadget = gadget; - common->ep0 = gadget->ep0; - common->ep0req = cdev->req; - common->cdev = cdev; - - /* Maybe allocate device-global string IDs, and patch descriptors */ - if (fsg_strings[FSG_STRING_INTERFACE].id == 0) { - rc = usb_string_id(cdev); - if (unlikely(rc < 0)) - goto error_release; - fsg_strings[FSG_STRING_INTERFACE].id = rc; - fsg_intf_desc.iInterface = rc; - } - - /* - * Create the LUNs, open their backing files, and register the - * LUN devices in sysfs. - */ - curlun = kcalloc(nluns, sizeof(*curlun), GFP_KERNEL); - if (unlikely(!curlun)) { - rc = -ENOMEM; - goto error_release; - } - common->luns = curlun; - - init_rwsem(&common->filesem); - - for (i = 0, lcfg = cfg->luns; i < nluns; ++i, ++curlun, ++lcfg) { - curlun->cdrom = !!lcfg->cdrom; - curlun->ro = lcfg->cdrom || lcfg->ro; - curlun->initially_ro = curlun->ro; - curlun->removable = lcfg->removable; - curlun->dev.release = fsg_lun_release; - curlun->dev.parent = &gadget->dev; - /* curlun->dev.driver = &fsg_driver.driver; XXX */ - dev_set_drvdata(&curlun->dev, &common->filesem); - dev_set_name(&curlun->dev, "lun%d", i); - - rc = device_register(&curlun->dev); - if (rc) { - INFO(common, "failed to register LUN%d: %d\n", i, rc); - common->nluns = i; - put_device(&curlun->dev); - goto error_release; - } - - rc = device_create_file(&curlun->dev, - curlun->cdrom - ? &dev_attr_ro_cdrom - : &dev_attr_ro); - if (rc) - goto error_luns; - rc = device_create_file(&curlun->dev, - curlun->removable - ? &dev_attr_file - : &dev_attr_file_nonremovable); - if (rc) - goto error_luns; - rc = device_create_file(&curlun->dev, &dev_attr_nofua); - if (rc) - goto error_luns; - - if (lcfg->filename) { - rc = fsg_lun_open(curlun, lcfg->filename); - if (rc) - goto error_luns; - } else if (!curlun->removable) { - ERROR(common, "no file given for LUN%d\n", i); - rc = -EINVAL; - goto error_luns; - } - } - common->nluns = nluns; - - /* Data buffers cyclic list */ - bh = common->buffhds; - i = fsg_num_buffers; - goto buffhds_first_it; - do { - bh->next = bh + 1; - ++bh; -buffhds_first_it: - bh->buf = kmalloc(FSG_BUFLEN, GFP_KERNEL); - if (unlikely(!bh->buf)) { - rc = -ENOMEM; - goto error_release; - } - } while (--i); - bh->next = common->buffhds; - - /* Prepare inquiryString */ - if (cfg->release != 0xffff) { - i = cfg->release; - } else { - i = usb_gadget_controller_number(gadget); - if (i >= 0) { - i = 0x0300 + i; - } else { - WARNING(common, "controller '%s' not recognized\n", - gadget->name); - i = 0x0399; - } - } - snprintf(common->inquiry_string, sizeof common->inquiry_string, - "%-8s%-16s%04x", cfg->vendor_name ?: "Linux", - /* Assume product name dependent on the first LUN */ - cfg->product_name ?: (common->luns->cdrom - ? "File-Stor Gadget" - : "File-CD Gadget"), - i); - - /* - * Some peripheral controllers are known not to be able to - * halt bulk endpoints correctly. If one of them is present, - * disable stalls. - */ - common->can_stall = cfg->can_stall && - !(gadget_is_at91(common->gadget)); - - spin_lock_init(&common->lock); - kref_init(&common->ref); - - /* Tell the thread to start working */ - common->thread_task = - kthread_create(fsg_main_thread, common, "file-storage"); - if (IS_ERR(common->thread_task)) { - rc = PTR_ERR(common->thread_task); - goto error_release; - } - init_completion(&common->thread_notifier); - init_waitqueue_head(&common->fsg_wait); - - /* Information */ - INFO(common, FSG_DRIVER_DESC ", version: " FSG_DRIVER_VERSION "\n"); - INFO(common, "Number of LUNs=%d\n", common->nluns); - - pathbuf = kmalloc(PATH_MAX, GFP_KERNEL); - for (i = 0, nluns = common->nluns, curlun = common->luns; - i < nluns; - ++curlun, ++i) { - char *p = "(no medium)"; - if (fsg_lun_is_open(curlun)) { - p = "(error)"; - if (pathbuf) { - p = d_path(&curlun->filp->f_path, - pathbuf, PATH_MAX); - if (IS_ERR(p)) - p = "(error)"; - } - } - LINFO(curlun, "LUN: %s%s%sfile: %s\n", - curlun->removable ? "removable " : "", - curlun->ro ? "read only " : "", - curlun->cdrom ? "CD-ROM " : "", - p); - } - kfree(pathbuf); - - DBG(common, "I/O thread pid: %d\n", task_pid_nr(common->thread_task)); - - wake_up_process(common->thread_task); - - return common; - -error_luns: - common->nluns = i + 1; -error_release: - common->state = FSG_STATE_TERMINATED; /* The thread is dead */ - /* Call fsg_common_release() directly, ref might be not initialised. */ - fsg_common_release(&common->ref); - return ERR_PTR(rc); -} - -static void fsg_common_release(struct kref *ref) -{ - struct fsg_common *common = container_of(ref, struct fsg_common, ref); - - /* If the thread isn't already dead, tell it to exit now */ - if (common->state != FSG_STATE_TERMINATED) { - raise_exception(common, FSG_STATE_EXIT); - wait_for_completion(&common->thread_notifier); - } - - if (likely(common->luns)) { - struct fsg_lun *lun = common->luns; - unsigned i = common->nluns; - - /* In error recovery common->nluns may be zero. */ - for (; i; --i, ++lun) { - device_remove_file(&lun->dev, &dev_attr_nofua); - device_remove_file(&lun->dev, - lun->cdrom - ? &dev_attr_ro_cdrom - : &dev_attr_ro); - device_remove_file(&lun->dev, - lun->removable - ? &dev_attr_file - : &dev_attr_file_nonremovable); - fsg_lun_close(lun); - device_unregister(&lun->dev); - } - - kfree(common->luns); - } - - { - struct fsg_buffhd *bh = common->buffhds; - unsigned i = fsg_num_buffers; - do { - kfree(bh->buf); - } while (++bh, --i); - } - - kfree(common->buffhds); - if (common->free_storage_on_release) - kfree(common); -} - - -/*-------------------------------------------------------------------------*/ - -static void fsg_unbind(struct usb_configuration *c, struct usb_function *f) -{ - struct fsg_dev *fsg = fsg_from_func(f); - struct fsg_common *common = fsg->common; - - DBG(fsg, "unbind\n"); - if (fsg->common->fsg == fsg) { - fsg->common->new_fsg = NULL; - raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE); - /* FIXME: make interruptible or killable somehow? */ - wait_event(common->fsg_wait, common->fsg != fsg); - } - - fsg_common_put(common); - usb_free_descriptors(fsg->function.descriptors); - usb_free_descriptors(fsg->function.hs_descriptors); - usb_free_descriptors(fsg->function.ss_descriptors); - kfree(fsg); -} - -static int fsg_bind(struct usb_configuration *c, struct usb_function *f) -{ - struct fsg_dev *fsg = fsg_from_func(f); - struct usb_gadget *gadget = c->cdev->gadget; - int i; - struct usb_ep *ep; - - fsg->gadget = gadget; - - /* New interface */ - i = usb_interface_id(c, f); - if (i < 0) - return i; - fsg_intf_desc.bInterfaceNumber = i; - fsg->interface_number = i; - - /* Find all the endpoints we will use */ - ep = usb_ep_autoconfig(gadget, &fsg_fs_bulk_in_desc); - if (!ep) - goto autoconf_fail; - ep->driver_data = fsg->common; /* 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->common; /* claim the endpoint */ - fsg->bulk_out = ep; - - /* Copy descriptors */ - f->descriptors = usb_copy_descriptors(fsg_fs_function); - if (unlikely(!f->descriptors)) - return -ENOMEM; - - if (gadget_is_dualspeed(gadget)) { - /* 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; - f->hs_descriptors = usb_copy_descriptors(fsg_hs_function); - if (unlikely(!f->hs_descriptors)) { - usb_free_descriptors(f->descriptors); - return -ENOMEM; - } - } - - if (gadget_is_superspeed(gadget)) { - unsigned max_burst; - - /* Calculate bMaxBurst, we know packet size is 1024 */ - max_burst = min_t(unsigned, FSG_BUFLEN / 1024, 15); - - fsg_ss_bulk_in_desc.bEndpointAddress = - fsg_fs_bulk_in_desc.bEndpointAddress; - fsg_ss_bulk_in_comp_desc.bMaxBurst = max_burst; - - fsg_ss_bulk_out_desc.bEndpointAddress = - fsg_fs_bulk_out_desc.bEndpointAddress; - fsg_ss_bulk_out_comp_desc.bMaxBurst = max_burst; - - f->ss_descriptors = usb_copy_descriptors(fsg_ss_function); - if (unlikely(!f->ss_descriptors)) { - usb_free_descriptors(f->hs_descriptors); - usb_free_descriptors(f->descriptors); - return -ENOMEM; - } - } - - return 0; - -autoconf_fail: - ERROR(fsg, "unable to autoconfigure all endpoints\n"); - return -ENOTSUPP; -} - - -/****************************** ADD FUNCTION ******************************/ - -static struct usb_gadget_strings *fsg_strings_array[] = { - &fsg_stringtab, - NULL, -}; - -static int fsg_bind_config(struct usb_composite_dev *cdev, - struct usb_configuration *c, - struct fsg_common *common) -{ - struct fsg_dev *fsg; - int rc; - - fsg = kzalloc(sizeof *fsg, GFP_KERNEL); - if (unlikely(!fsg)) - return -ENOMEM; - - fsg->function.name = FSG_DRIVER_DESC; - fsg->function.strings = fsg_strings_array; - fsg->function.bind = fsg_bind; - fsg->function.unbind = fsg_unbind; - fsg->function.setup = fsg_setup; - fsg->function.set_alt = fsg_set_alt; - fsg->function.disable = fsg_disable; - - fsg->common = common; - /* - * Our caller holds a reference to common structure so we - * don't have to be worry about it being freed until we return - * from this function. So instead of incrementing counter now - * and decrement in error recovery we increment it only when - * call to usb_add_function() was successful. - */ - - rc = usb_add_function(c, &fsg->function); - if (unlikely(rc)) - kfree(fsg); - else - fsg_common_get(fsg->common); - return rc; -} - - -/************************* Module parameters *************************/ - -struct fsg_module_parameters { - char *file[FSG_MAX_LUNS]; - bool ro[FSG_MAX_LUNS]; - bool removable[FSG_MAX_LUNS]; - bool cdrom[FSG_MAX_LUNS]; - bool nofua[FSG_MAX_LUNS]; - - unsigned int file_count, ro_count, removable_count, cdrom_count; - unsigned int nofua_count; - unsigned int luns; /* nluns */ - bool stall; /* can_stall */ -}; - -#define _FSG_MODULE_PARAM_ARRAY(prefix, params, name, type, desc) \ - module_param_array_named(prefix ## name, params.name, type, \ - &prefix ## params.name ## _count, \ - S_IRUGO); \ - MODULE_PARM_DESC(prefix ## name, desc) - -#define _FSG_MODULE_PARAM(prefix, params, name, type, desc) \ - module_param_named(prefix ## name, params.name, type, \ - S_IRUGO); \ - MODULE_PARM_DESC(prefix ## name, desc) - -#define FSG_MODULE_PARAMETERS(prefix, params) \ - _FSG_MODULE_PARAM_ARRAY(prefix, params, file, charp, \ - "names of backing files or devices"); \ - _FSG_MODULE_PARAM_ARRAY(prefix, params, ro, bool, \ - "true to force read-only"); \ - _FSG_MODULE_PARAM_ARRAY(prefix, params, removable, bool, \ - "true to simulate removable media"); \ - _FSG_MODULE_PARAM_ARRAY(prefix, params, cdrom, bool, \ - "true to simulate CD-ROM instead of disk"); \ - _FSG_MODULE_PARAM_ARRAY(prefix, params, nofua, bool, \ - "true to ignore SCSI WRITE(10,12) FUA bit"); \ - _FSG_MODULE_PARAM(prefix, params, luns, uint, \ - "number of LUNs"); \ - _FSG_MODULE_PARAM(prefix, params, stall, bool, \ - "false to prevent bulk stalls") - -static void -fsg_config_from_params(struct fsg_config *cfg, - const struct fsg_module_parameters *params) -{ - struct fsg_lun_config *lun; - unsigned i; - - /* Configure LUNs */ - cfg->nluns = - min(params->luns ?: (params->file_count ?: 1u), - (unsigned)FSG_MAX_LUNS); - for (i = 0, lun = cfg->luns; i < cfg->nluns; ++i, ++lun) { - lun->ro = !!params->ro[i]; - lun->cdrom = !!params->cdrom[i]; - lun->removable = !!params->removable[i]; - lun->filename = - params->file_count > i && params->file[i][0] - ? params->file[i] - : 0; - } - - /* Let MSF use defaults */ - cfg->vendor_name = 0; - cfg->product_name = 0; - cfg->release = 0xffff; - - cfg->ops = NULL; - cfg->private_data = NULL; - - /* Finalise */ - cfg->can_stall = params->stall; -} - -static inline struct fsg_common * -fsg_common_from_params(struct fsg_common *common, - struct usb_composite_dev *cdev, - const struct fsg_module_parameters *params) - __attribute__((unused)); -static inline struct fsg_common * -fsg_common_from_params(struct fsg_common *common, - struct usb_composite_dev *cdev, - const struct fsg_module_parameters *params) -{ - struct fsg_config cfg; - fsg_config_from_params(&cfg, params); - return fsg_common_init(common, cdev, &cfg); -} |