+++ /dev/null
-/*
- * drivers/usb/gadget/f_mass_storage.c
- *
- * Function Driver for USB Mass Storage
- *
- * Copyright (C) 2008 Google, Inc.
- * Author: Mike Lockwood <lockwood@android.com>
- *
- * Based heavily on the file_storage gadget driver in
- * drivers/usb/gadget/file_storage.c and licensed under the same terms:
- *
- * Copyright (C) 2003-2007 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.
- */
-
-/* #define DEBUG */
-/* #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/switch.h>
-#include <linux/freezer.h>
-#include <linux/utsname.h>
-#include <linux/wakelock.h>
-#include <linux/platform_device.h>
-
-#include <linux/usb.h>
-#include <linux/usb_usual.h>
-#include <linux/usb/ch9.h>
-#include <linux/usb/android_composite.h>
-
-#include "gadget_chips.h"
-
-
-#define BULK_BUFFER_SIZE 4096
-
-/* flush after every 4 meg of writes to avoid excessive block level caching */
-#define MAX_UNFLUSHED_BYTES (4 * 1024 * 1024)
-
-/*-------------------------------------------------------------------------*/
-
-#define DRIVER_NAME "usb_mass_storage"
-#define MAX_LUNS 8
-
-static const char shortname[] = DRIVER_NAME;
-
-#ifdef DEBUG
-#define LDBG(lun, fmt, args...) \
- dev_dbg(&(lun)->dev , fmt , ## args)
-#define MDBG(fmt,args...) \
- printk(KERN_DEBUG DRIVER_NAME ": " fmt , ## args)
-#else
-#define LDBG(lun, fmt, args...) \
- do { } while (0)
-#define MDBG(fmt,args...) \
- do { } while (0)
-#undef VERBOSE_DEBUG
-#undef DUMP_MSGS
-#endif /* DEBUG */
-
-#ifdef VERBOSE_DEBUG
-#define VLDBG LDBG
-#else
-#define VLDBG(lun, fmt, args...) \
- do { } while (0)
-#endif /* VERBOSE_DEBUG */
-
-#define LERROR(lun, fmt, args...) \
- dev_err(&(lun)->dev , fmt , ## args)
-#define LWARN(lun, fmt, args...) \
- dev_warn(&(lun)->dev , fmt , ## args)
-#define LINFO(lun, fmt, args...) \
- dev_info(&(lun)->dev , fmt , ## args)
-
-#define MINFO(fmt,args...) \
- printk(KERN_INFO DRIVER_NAME ": " fmt , ## args)
-
-#undef DBG
-#undef VDBG
-#undef ERROR
-#undef WARNING
-#undef INFO
-#define DBG(d, fmt, args...) \
- dev_dbg(&(d)->cdev->gadget->dev , fmt , ## args)
-#define VDBG(d, fmt, args...) \
- dev_vdbg(&(d)->cdev->gadget->dev , fmt , ## args)
-#define ERROR(d, fmt, args...) \
- dev_err(&(d)->cdev->gadget->dev , fmt , ## args)
-#define WARNING(d, fmt, args...) \
- dev_warn(&(d)->cdev->gadget->dev , fmt , ## args)
-#define INFO(d, fmt, args...) \
- dev_info(&(d)->cdev->gadget->dev , fmt , ## args)
-
-
-/*-------------------------------------------------------------------------*/
-
-/* Bulk-only data structures */
-
-/* Command Block Wrapper */
-struct bulk_cb_wrap {
- __le32 Signature; /* Contains 'USBC' */
- u32 Tag; /* Unique per command id */
- __le32 DataTransferLength; /* Size of the data */
- u8 Flags; /* Direction in bit 7 */
- u8 Lun; /* LUN (normally 0) */
- u8 Length; /* Of the CDB, <= MAX_COMMAND_SIZE */
- u8 CDB[16]; /* Command Data Block */
-};
-
-#define USB_BULK_CB_WRAP_LEN 31
-#define USB_BULK_CB_SIG 0x43425355 /* Spells out USBC */
-#define USB_BULK_IN_FLAG 0x80
-
-/* Command Status Wrapper */
-struct bulk_cs_wrap {
- __le32 Signature; /* Should = 'USBS' */
- u32 Tag; /* Same as original command */
- __le32 Residue; /* Amount not transferred */
- u8 Status; /* See below */
-};
-
-#define USB_BULK_CS_WRAP_LEN 13
-#define USB_BULK_CS_SIG 0x53425355 /* Spells out 'USBS' */
-#define USB_STATUS_PASS 0
-#define USB_STATUS_FAIL 1
-#define USB_STATUS_PHASE_ERROR 2
-
-/* Bulk-only class specific requests */
-#define USB_BULK_RESET_REQUEST 0xff
-#define USB_BULK_GET_MAX_LUN_REQUEST 0xfe
-
-/* Length of a SCSI Command Data Block */
-#define MAX_COMMAND_SIZE 16
-
-/* SCSI commands that we recognize */
-#define SC_FORMAT_UNIT 0x04
-#define SC_INQUIRY 0x12
-#define SC_MODE_SELECT_6 0x15
-#define SC_MODE_SELECT_10 0x55
-#define SC_MODE_SENSE_6 0x1a
-#define SC_MODE_SENSE_10 0x5a
-#define SC_PREVENT_ALLOW_MEDIUM_REMOVAL 0x1e
-#define SC_READ_6 0x08
-#define SC_READ_10 0x28
-#define SC_READ_12 0xa8
-#define SC_READ_CAPACITY 0x25
-#define SC_READ_FORMAT_CAPACITIES 0x23
-#define SC_RELEASE 0x17
-#define SC_REQUEST_SENSE 0x03
-#define SC_RESERVE 0x16
-#define SC_SEND_DIAGNOSTIC 0x1d
-#define SC_START_STOP_UNIT 0x1b
-#define SC_SYNCHRONIZE_CACHE 0x35
-#define SC_TEST_UNIT_READY 0x00
-#define SC_VERIFY 0x2f
-#define SC_WRITE_6 0x0a
-#define SC_WRITE_10 0x2a
-#define SC_WRITE_12 0xaa
-
-/* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */
-#define SS_NO_SENSE 0
-#define SS_COMMUNICATION_FAILURE 0x040800
-#define SS_INVALID_COMMAND 0x052000
-#define SS_INVALID_FIELD_IN_CDB 0x052400
-#define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100
-#define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500
-#define SS_MEDIUM_NOT_PRESENT 0x023a00
-#define SS_MEDIUM_REMOVAL_PREVENTED 0x055302
-#define SS_NOT_READY_TO_READY_TRANSITION 0x062800
-#define SS_RESET_OCCURRED 0x062900
-#define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900
-#define SS_UNRECOVERED_READ_ERROR 0x031100
-#define SS_WRITE_ERROR 0x030c02
-#define SS_WRITE_PROTECTED 0x072700
-
-#define SK(x) ((u8) ((x) >> 16)) /* Sense Key byte, etc. */
-#define ASC(x) ((u8) ((x) >> 8))
-#define ASCQ(x) ((u8) (x))
-
-
-/*-------------------------------------------------------------------------*/
-
-struct lun {
- struct file *filp;
- loff_t file_length;
- loff_t num_sectors;
- unsigned int unflushed_bytes;
-
- unsigned int ro : 1;
- unsigned int prevent_medium_removal : 1;
- unsigned int registered : 1;
- unsigned int info_valid : 1;
-
- u32 sense_data;
- u32 sense_data_info;
- u32 unit_attention_data;
-
- struct device dev;
-};
-
-#define backing_file_is_open(curlun) ((curlun)->filp != NULL)
-
-
-static struct lun *dev_to_lun(struct device *dev)
-{
- return container_of(dev, struct lun, dev);
-}
-
-/* Big enough to hold our biggest descriptor */
-#define EP0_BUFSIZE 256
-
-/* Number of buffers we will use. 2 is enough for double-buffering */
-#define NUM_BUFFERS 2
-
-enum fsg_buffer_state {
- BUF_STATE_EMPTY = 0,
- BUF_STATE_FULL,
- BUF_STATE_BUSY
-};
-
-struct fsg_buffhd {
- void *buf;
- enum fsg_buffer_state state;
- struct fsg_buffhd *next;
-
- /* The NetChip 2280 is faster, and handles some protocol faults
- * better, if we don't submit any short bulk-out read requests.
- * So we will record the intended request length here. */
- unsigned int bulk_out_intended_length;
-
- struct usb_request *inreq;
- int inreq_busy;
- struct usb_request *outreq;
- int outreq_busy;
-};
-
-enum fsg_state {
- /* This one isn't used anywhere */
- FSG_STATE_COMMAND_PHASE = -10,
-
- FSG_STATE_DATA_PHASE,
- FSG_STATE_STATUS_PHASE,
-
- FSG_STATE_IDLE = 0,
- FSG_STATE_ABORT_BULK_OUT,
- FSG_STATE_RESET,
- FSG_STATE_CONFIG_CHANGE,
- FSG_STATE_EXIT,
- FSG_STATE_TERMINATED
-};
-
-enum data_direction {
- DATA_DIR_UNKNOWN = 0,
- DATA_DIR_FROM_HOST,
- DATA_DIR_TO_HOST,
- DATA_DIR_NONE
-};
-
-struct fsg_dev {
- struct usb_function function;
- struct usb_composite_dev *cdev;
-
- /* optional "usb_mass_storage" platform device */
- struct platform_device *pdev;
-
- /* lock protects: state and all the req_busy's */
- spinlock_t lock;
-
- /* filesem protects: backing files in use */
- struct rw_semaphore filesem;
-
- /* reference counting: wait until all LUNs are released */
- struct kref ref;
-
- unsigned int bulk_out_maxpacket;
- enum fsg_state state; /* For exception handling */
-
- u8 config, new_config;
-
- unsigned int running : 1;
- unsigned int bulk_in_enabled : 1;
- unsigned int bulk_out_enabled : 1;
- unsigned int phase_error : 1;
- unsigned int short_packet_received : 1;
- unsigned int bad_lun_okay : 1;
-
- unsigned long atomic_bitflags;
-#define REGISTERED 0
-#define CLEAR_BULK_HALTS 1
-#define SUSPENDED 2
-
- struct usb_ep *bulk_in;
- struct usb_ep *bulk_out;
-
- struct fsg_buffhd *next_buffhd_to_fill;
- struct fsg_buffhd *next_buffhd_to_drain;
- struct fsg_buffhd buffhds[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;
-
- unsigned int nluns;
- struct lun *luns;
- struct lun *curlun;
-
- u32 buf_size;
- const char *vendor;
- const char *product;
- int release;
-
- struct switch_dev sdev;
-
- struct wake_lock wake_lock;
-};
-
-static inline struct fsg_dev *func_to_dev(struct usb_function *f)
-{
- return container_of(f, struct fsg_dev, function);
-}
-
-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 void close_backing_file(struct fsg_dev *fsg, struct lun *curlun);
-static void close_all_backing_files(struct fsg_dev *fsg);
-static int fsync_sub(struct lun *curlun);
-
-/*-------------------------------------------------------------------------*/
-
-#ifdef DUMP_MSGS
-
-static void dump_msg(struct fsg_dev *fsg, const char *label,
- const u8 *buf, unsigned int length)
-{
- if (length < 512) {
- DBG(fsg, "%s, length %u:\n", label, length);
- print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET,
- 16, 1, buf, length, 0);
- }
-}
-
-static void dump_cdb(struct fsg_dev *fsg)
-{}
-
-#else
-
-static void dump_msg(struct fsg_dev *fsg, const char *label,
- const u8 *buf, unsigned int length)
-{}
-
-#ifdef VERBOSE_DEBUG
-
-static void dump_cdb(struct fsg_dev *fsg)
-{
- print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE,
- 16, 1, fsg->cmnd, fsg->cmnd_size, 0);
-}
-
-#else
-
-static void dump_cdb(struct fsg_dev *fsg)
-{}
-
-#endif /* VERBOSE_DEBUG */
-#endif /* DUMP_MSGS */
-
-
-/*-------------------------------------------------------------------------*/
-
-/* Routines for unaligned data access */
-
-static u16 get_be16(u8 *buf)
-{
- return ((u16) buf[0] << 8) | ((u16) buf[1]);
-}
-
-static u32 get_be32(u8 *buf)
-{
- return ((u32) buf[0] << 24) | ((u32) buf[1] << 16) |
- ((u32) buf[2] << 8) | ((u32) buf[3]);
-}
-
-static void put_be16(u8 *buf, u16 val)
-{
- buf[0] = val >> 8;
- buf[1] = val;
-}
-
-static void put_be32(u8 *buf, u32 val)
-{
- buf[0] = val >> 24;
- buf[1] = val >> 16;
- buf[2] = val >> 8;
- buf[3] = val & 0xff;
-}
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * 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 interface. */
-
-static struct usb_interface_descriptor
-intf_desc = {
- .bLength = sizeof intf_desc,
- .bDescriptorType = USB_DT_INTERFACE,
-
- .bNumEndpoints = 2, /* Adjusted during fsg_bind() */
- .bInterfaceClass = USB_CLASS_MASS_STORAGE,
- .bInterfaceSubClass = US_SC_SCSI,
- .bInterfaceProtocol = US_PR_BULK,
-};
-
-/* Three full-speed endpoint descriptors: bulk-in, bulk-out,
- * and interrupt-in. */
-
-static struct usb_endpoint_descriptor
-fs_bulk_in_desc = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
-
- .bEndpointAddress = USB_DIR_IN,
- .bmAttributes = USB_ENDPOINT_XFER_BULK,
- /* wMaxPacketSize set by autoconfiguration */
-};
-
-static struct usb_endpoint_descriptor
-fs_bulk_out_desc = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
-
- .bEndpointAddress = USB_DIR_OUT,
- .bmAttributes = USB_ENDPOINT_XFER_BULK,
- /* wMaxPacketSize set by autoconfiguration */
-};
-
-static struct usb_descriptor_header *fs_function[] = {
- (struct usb_descriptor_header *) &intf_desc,
- (struct usb_descriptor_header *) &fs_bulk_in_desc,
- (struct usb_descriptor_header *) &fs_bulk_out_desc,
- NULL,
-};
-#define FS_FUNCTION_PRE_EP_ENTRIES 2
-
-
-static struct usb_endpoint_descriptor
-hs_bulk_in_desc = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
-
- /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
- .bmAttributes = USB_ENDPOINT_XFER_BULK,
- .wMaxPacketSize = __constant_cpu_to_le16(512),
-};
-
-static struct usb_endpoint_descriptor
-hs_bulk_out_desc = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
-
- /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
- .bmAttributes = USB_ENDPOINT_XFER_BULK,
- .wMaxPacketSize = __constant_cpu_to_le16(512),
- .bInterval = 1, /* NAK every 1 uframe */
-};
-
-
-static struct usb_descriptor_header *hs_function[] = {
- (struct usb_descriptor_header *) &intf_desc,
- (struct usb_descriptor_header *) &hs_bulk_in_desc,
- (struct usb_descriptor_header *) &hs_bulk_out_desc,
- NULL,
-};
-
-/* Maxpacket and other transfer characteristics vary by speed. */
-static struct usb_endpoint_descriptor *
-ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs,
- struct usb_endpoint_descriptor *hs)
-{
- if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
- return hs;
- return fs;
-}
-
-/*-------------------------------------------------------------------------*/
-
-/* 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;
-
- DBG(fsg, "raise_exception %d\n", (int)new_state);
- /* 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->state = new_state;
- if (fsg->thread_task)
- send_sig_info(SIGUSR1, SEND_SIG_FORCED,
- fsg->thread_task);
- }
- spin_unlock_irqrestore(&fsg->lock, flags);
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-/* 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;
- unsigned long flags;
-
- if (req->status || req->actual != req->length)
- DBG(fsg, "%s --> %d, %u/%u\n", __func__,
- req->status, req->actual, req->length);
-
- /* Hold the lock while we update the request and buffer states */
- smp_wmb();
- spin_lock_irqsave(&fsg->lock, flags);
- bh->inreq_busy = 0;
- bh->state = BUF_STATE_EMPTY;
- wakeup_thread(fsg);
- spin_unlock_irqrestore(&fsg->lock, flags);
-}
-
-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;
- unsigned long flags;
-
- 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);
-
- /* Hold the lock while we update the request and buffer states */
- smp_wmb();
- spin_lock_irqsave(&fsg->lock, flags);
- bh->outreq_busy = 0;
- bh->state = BUF_STATE_FULL;
- wakeup_thread(fsg);
- spin_unlock_irqrestore(&fsg->lock, flags);
-}
-
-static int fsg_function_setup(struct usb_function *f,
- const struct usb_ctrlrequest *ctrl)
-{
- struct fsg_dev *fsg = func_to_dev(f);
- struct usb_composite_dev *cdev = fsg->cdev;
- 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);
-
- DBG(fsg, "fsg_function_setup\n");
- /* Handle Bulk-only class-specific requests */
- if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) {
- DBG(fsg, "USB_TYPE_CLASS\n");
- 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 = 0;
- 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 *)cdev->req->buf = fsg->nluns - 1;
- value = 1;
- break;
- }
- }
-
- /* respond with data transfer or status phase? */
- if (value >= 0) {
- int rc;
- cdev->req->zero = value < w_length;
- cdev->req->length = value;
- rc = usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
- if (rc < 0)
- printk("%s setup response queue error\n", __func__);
- }
-
- 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;
-}
-
-/*-------------------------------------------------------------------------*/
-
-/* 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;
- unsigned long flags;
-
- DBG(fsg, "start_transfer req: %p, req->buf: %p\n", req, req->buf);
- if (ep == fsg->bulk_in)
- dump_msg(fsg, "bulk-in", req->buf, req->length);
-
- spin_lock_irqsave(&fsg->lock, flags);
- *pbusy = 1;
- *state = BUF_STATE_BUSY;
- spin_unlock_irqrestore(&fsg->lock, flags);
- rc = usb_ep_queue(ep, req, GFP_KERNEL);
- if (rc != 0) {
- *pbusy = 0;
- *state = BUF_STATE_EMPTY;
-
- /* We can't do much more than wait for a reset */
-
- /* Note: currently the net2280 driver fails zero-length
- * submissions if DMA is enabled. */
- if (rc != -ESHUTDOWN && !(rc == -EOPNOTSUPP &&
- req->length == 0))
- WARN(fsg, "error in submission: %s --> %d\n",
- (ep == fsg->bulk_in ? "bulk-in" : "bulk-out"),
- 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 lun *curlun = fsg->curlun;
- u32 lba;
- struct fsg_buffhd *bh;
- int rc;
- u32 amount_left;
- loff_t file_offset, file_offset_tmp;
- unsigned int amount;
- unsigned int partial_page;
- ssize_t nread;
-
- /* Get the starting Logical Block Address and check that it's
- * not too big */
- if (fsg->cmnd[0] == SC_READ_6)
- lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
- else {
- lba = get_be32(&fsg->cmnd[2]);
-
- /* We allow DPO (Disable Page Out = don't save data in the
- * cache) and FUA (Force Unit Access = don't read from the
- * cache), but we don't implement them. */
- if ((fsg->cmnd[1] & ~0x18) != 0) {
- curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
- return -EINVAL;
- }
- }
- if (lba >= curlun->num_sectors) {
- curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
- return -EINVAL;
- }
- file_offset = ((loff_t) lba) << 9;
-
- /* Carry out the file reads */
- amount_left = fsg->data_size_from_cmnd;
- if (unlikely(amount_left == 0))
- return -EIO; /* No default reply */
-
- for (;;) {
-
- /* Figure out how much we need to read:
- * Try to read the remaining amount.
- * But don't read more than the buffer size.
- * And don't try to read past the end of the file.
- * Finally, if we're not at a page boundary, don't read past
- * the next page.
- * If this means reading 0 then we were asked to read past
- * the end of file. */
- amount = min((unsigned int) amount_left,
- (unsigned int)fsg->buf_size);
- 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 */
- start_transfer(fsg, fsg->bulk_in, bh->inreq,
- &bh->inreq_busy, &bh->state);
- fsg->next_buffhd_to_fill = bh->next;
- }
-
- return -EIO; /* No default reply */
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static int do_write(struct fsg_dev *fsg)
-{
- struct lun *curlun = fsg->curlun;
- u32 lba;
- struct fsg_buffhd *bh;
- int get_some_more;
- u32 amount_left_to_req, amount_left_to_write;
- loff_t usb_offset, file_offset, file_offset_tmp;
- unsigned int amount;
- unsigned int partial_page;
- ssize_t nwritten;
- int rc;
-
- if (curlun->ro) {
- curlun->sense_data = SS_WRITE_PROTECTED;
- return -EINVAL;
- }
- curlun->filp->f_flags &= ~O_SYNC; /* Default is not to wait */
-
- /* Get the starting Logical Block Address and check that it's
- * not too big */
- if (fsg->cmnd[0] == SC_WRITE_6)
- lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
- else {
- lba = get_be32(&fsg->cmnd[2]);
-
- /* We allow DPO (Disable Page Out = don't save data in the
- * cache) and FUA (Force Unit Access = write directly to the
- * medium). We don't implement DPO; we implement FUA by
- * performing synchronous output. */
- if ((fsg->cmnd[1] & ~0x18) != 0) {
- curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
- return -EINVAL;
- }
- if (fsg->cmnd[1] & 0x08) /* FUA */
- curlun->filp->f_flags |= O_SYNC;
- }
- if (lba >= curlun->num_sectors) {
- curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
- return -EINVAL;
- }
-
- /* Carry out the file writes */
- get_some_more = 1;
- file_offset = usb_offset = ((loff_t) lba) << 9;
- amount_left_to_req = amount_left_to_write = fsg->data_size_from_cmnd;
-
- while (amount_left_to_write > 0) {
-
- /* Queue a request for more data from the host */
- bh = fsg->next_buffhd_to_fill;
- if (bh->state == BUF_STATE_EMPTY && get_some_more) {
-
- /* Figure out how much we want to get:
- * Try to get the remaining amount.
- * But don't get more than the buffer size.
- * And don't try to go past the end of the file.
- * If we're not at a page boundary,
- * don't go past the next page.
- * If this means getting 0, then we were asked
- * to write past the end of file.
- * Finally, round down to a block boundary. */
- amount = min(amount_left_to_req, (u32)fsg->buf_size);
- 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;
- 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;
-
-#ifdef MAX_UNFLUSHED_BYTES
- curlun->unflushed_bytes += nwritten;
- if (curlun->unflushed_bytes >= MAX_UNFLUSHED_BYTES) {
- fsync_sub(curlun);
- curlun->unflushed_bytes = 0;
- }
-#endif
- /* 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 */
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-/* Sync the file data, don't bother with the metadata.
- * The caller must own fsg->filesem.
- * This code was copied from fs/buffer.c:sys_fdatasync(). */
-static int fsync_sub(struct lun *curlun)
-{
- struct file *filp = curlun->filp;
- struct inode *inode;
- int rc, err;
-
- if (curlun->ro || !filp)
- return 0;
- if (!filp->f_op->fsync)
- return -EINVAL;
-
- inode = filp->f_path.dentry->d_inode;
- mutex_lock(&inode->i_mutex);
- rc = filemap_fdatawrite(inode->i_mapping);
- err = filp->f_op->fsync(filp, 1);
- if (!rc)
- rc = err;
- err = filemap_fdatawait(inode->i_mapping);
- if (!rc)
- rc = err;
- mutex_unlock(&inode->i_mutex);
- VLDBG(curlun, "fdatasync -> %d\n", rc);
- return rc;
-}
-
-static void fsync_all(struct fsg_dev *fsg)
-{
- int i;
-
- for (i = 0; i < fsg->nluns; ++i)
- fsync_sub(&fsg->luns[i]);
-}
-
-static int do_synchronize_cache(struct fsg_dev *fsg)
-{
- struct lun *curlun = fsg->curlun;
- int rc;
-
- /* We ignore the requested LBA and write out all file's
- * dirty data buffers. */
- rc = fsync_sub(curlun);
- if (rc)
- curlun->sense_data = SS_WRITE_ERROR;
- return 0;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static void invalidate_sub(struct lun *curlun)
-{
- struct file *filp = curlun->filp;
- struct inode *inode = filp->f_path.dentry->d_inode;
- unsigned long rc;
-
- rc = invalidate_mapping_pages(inode->i_mapping, 0, -1);
- VLDBG(curlun, "invalidate_inode_pages -> %ld\n", rc);
-}
-
-static int do_verify(struct fsg_dev *fsg)
-{
- struct lun *curlun = fsg->curlun;
- u32 lba;
- u32 verification_length;
- struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
- loff_t file_offset, file_offset_tmp;
- u32 amount_left;
- unsigned int amount;
- ssize_t nread;
-
- /* Get the starting Logical Block Address and check that it's
- * not too big */
- lba = get_be32(&fsg->cmnd[2]);
- if (lba >= curlun->num_sectors) {
- curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
- return -EINVAL;
- }
-
- /* We allow DPO (Disable Page Out = don't save data in the
- * cache) but we don't implement it. */
- if ((fsg->cmnd[1] & ~0x10) != 0) {
- curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
- return -EINVAL;
- }
-
- verification_length = get_be16(&fsg->cmnd[7]);
- if (unlikely(verification_length == 0))
- return -EIO; /* No default reply */
-
- /* Prepare to carry out the file verify */
- amount_left = verification_length << 9;
- file_offset = ((loff_t) lba) << 9;
-
- /* Write out all the dirty buffers before invalidating them */
- fsync_sub(curlun);
- if (signal_pending(current))
- return -EINTR;
-
- invalidate_sub(curlun);
- if (signal_pending(current))
- return -EINTR;
-
- /* Just try to read the requested blocks */
- while (amount_left > 0) {
-
- /* Figure out how much we need to read:
- * Try to read the remaining amount, but not more than
- * the buffer size.
- * And don't try to read past the end of the file.
- * If this means reading 0 then we were asked to read
- * past the end of file. */
- amount = min((unsigned int) amount_left,
- (unsigned int)fsg->buf_size);
- 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;
-
- if (!fsg->curlun) { /* Unsupported LUNs are okay */
- fsg->bad_lun_okay = 1;
- memset(buf, 0, 36);
- buf[0] = 0x7f; /* Unsupported, no device-type */
- return 36;
- }
-
- memset(buf, 0, 8); /* Non-removable, direct-access device */
-
- buf[1] = 0x80; /* set removable bit */
- 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", fsg->vendor,
- fsg->product, fsg->release);
- return 36;
-}
-
-
-static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
- struct lun *curlun = fsg->curlun;
- u8 *buf = (u8 *) bh->buf;
- u32 sd, sdinfo;
- 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_be32(&buf[3], sdinfo); /* Sense information */
- buf[7] = 18 - 8; /* Additional sense length */
- buf[12] = ASC(sd);
- buf[13] = ASCQ(sd);
- return 18;
-}
-
-
-static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
- struct lun *curlun = fsg->curlun;
- u32 lba = get_be32(&fsg->cmnd[2]);
- int pmi = fsg->cmnd[8];
- u8 *buf = (u8 *) bh->buf;
-
- /* Check the PMI and LBA fields */
- if (pmi > 1 || (pmi == 0 && lba != 0)) {
- curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
- return -EINVAL;
- }
-
- put_be32(&buf[0], curlun->num_sectors - 1); /* Max logical block */
- put_be32(&buf[4], 512); /* Block length */
- return 8;
-}
-
-
-static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
- struct lun *curlun = fsg->curlun;
- int mscmnd = fsg->cmnd[0];
- u8 *buf = (u8 *) bh->buf;
- u8 *buf0 = buf;
- int pc, page_code;
- int changeable_values, all_pages;
- int valid_page = 0;
- int len, limit;
-
- if ((fsg->cmnd[1] & ~0x08) != 0) { /* Mask away DBD */
- curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
- return -EINVAL;
- }
- pc = fsg->cmnd[2] >> 6;
- page_code = fsg->cmnd[2] & 0x3f;
- if (pc == 3) {
- curlun->sense_data = SS_SAVING_PARAMETERS_NOT_SUPPORTED;
- return -EINVAL;
- }
- changeable_values = (pc == 1);
- all_pages = (page_code == 0x3f);
-
- /* Write the mode parameter header. Fixed values are: default
- * medium type, no cache control (DPOFUA), and no block descriptors.
- * The only variable value is the WriteProtect bit. We will fill in
- * the mode data length later. */
- memset(buf, 0, 8);
- if (mscmnd == SC_MODE_SENSE_6) {
- buf[2] = (curlun->ro ? 0x80 : 0x00); /* WP, DPOFUA */
- buf += 4;
- limit = 255;
- } else { /* SC_MODE_SENSE_10 */
- buf[3] = (curlun->ro ? 0x80 : 0x00); /* WP, DPOFUA */
- buf += 8;
- limit = 65535;
- }
-
- /* No block descriptors */
-
- /* Disabled to workaround USB reset problems with a Vista host.
- */
-#if 0
- /* The mode pages, in numerical order. The only page we support
- * is the Caching page. */
- if (page_code == 0x08 || all_pages) {
- valid_page = 1;
- buf[0] = 0x08; /* Page code */
- buf[1] = 10; /* Page length */
- memset(buf+2, 0, 10); /* None of the fields are changeable */
-
- if (!changeable_values) {
- buf[2] = 0x04; /* Write cache enable, */
- /* Read cache not disabled */
- /* No cache retention priorities */
- put_be16(&buf[4], 0xffff); /* Don't disable prefetch */
- /* Minimum prefetch = 0 */
- put_be16(&buf[8], 0xffff); /* Maximum prefetch */
- /* Maximum prefetch ceiling */
- put_be16(&buf[10], 0xffff);
- }
- buf += 12;
- }
-#else
- valid_page = 1;
-#endif
-
- /* Check that a valid page was requested and the mode data length
- * isn't too long. */
- len = buf - buf0;
- if (!valid_page || len > limit) {
- curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
- return -EINVAL;
- }
-
- /* Store the mode data length */
- if (mscmnd == SC_MODE_SENSE_6)
- buf0[0] = len - 1;
- else
- put_be16(buf0, len - 2);
- return len;
-}
-
-static int do_start_stop(struct fsg_dev *fsg)
-{
- struct lun *curlun = fsg->curlun;
- int loej, start;
-
- /* int immed = fsg->cmnd[1] & 0x01; */
- loej = fsg->cmnd[4] & 0x02;
- start = fsg->cmnd[4] & 0x01;
-
- if (loej) {
- /* eject request from the host */
- if (backing_file_is_open(curlun)) {
- close_backing_file(fsg, curlun);
- curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT;
- }
- }
-
- return 0;
-}
-
-static int do_prevent_allow(struct fsg_dev *fsg)
-{
- struct lun *curlun = fsg->curlun;
- int prevent;
-
- prevent = fsg->cmnd[4] & 0x01;
- if ((fsg->cmnd[4] & ~0x01) != 0) { /* Mask away Prevent */
- curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
- return -EINVAL;
- }
-
- if (curlun->prevent_medium_removal && !prevent)
- fsync_sub(curlun);
- curlun->prevent_medium_removal = prevent;
- return 0;
-}
-
-
-static int do_read_format_capacities(struct fsg_dev *fsg,
- struct fsg_buffhd *bh)
-{
- struct lun *curlun = fsg->curlun;
- u8 *buf = (u8 *) bh->buf;
-
- buf[0] = buf[1] = buf[2] = 0;
- buf[3] = 8; /* Only the Current/Maximum Capacity Descriptor */
- buf += 4;
-
- put_be32(&buf[0], curlun->num_sectors); /* Number of blocks */
- put_be32(&buf[4], 512); /* Block length */
- buf[4] = 0x02; /* Current capacity */
- return 12;
-}
-
-
-static int do_mode_select(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
- struct lun *curlun = fsg->curlun;
-
- /* We don't support MODE SELECT */
- curlun->sense_data = SS_INVALID_COMMAND;
- return -EINVAL;
-}
-
-
-/*-------------------------------------------------------------------------*/
-#if 0
-static int write_zero(struct fsg_dev *fsg)
-{
- struct fsg_buffhd *bh;
- int rc;
-
- DBG(fsg, "write_zero\n");
- /* 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;
- }
-
- bh->inreq->length = 0;
- start_transfer(fsg, fsg->bulk_in, bh->inreq,
- &bh->inreq_busy, &bh->state);
-
- fsg->next_buffhd_to_fill = bh->next;
- return 0;
-}
-#endif
-
-static int throw_away_data(struct fsg_dev *fsg)
-{
- struct fsg_buffhd *bh;
- u32 amount;
- int rc;
-
- DBG(fsg, "throw_away_data\n");
- 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) fsg->buf_size);
-
- /* amount is always divisible by 512, hence by
- * the bulk-out maxpacket size */
- bh->outreq->length = bh->bulk_out_intended_length =
- amount;
- start_transfer(fsg, fsg->bulk_out, bh->outreq,
- &bh->outreq_busy, &bh->state);
- fsg->next_buffhd_to_fill = bh->next;
- fsg->usb_amount_left -= amount;
- continue;
- }
-
- /* Otherwise wait for something to happen */
- 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 */
-
- case DATA_DIR_UNKNOWN:
- rc = -EINVAL;
- 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) {
- start_transfer(fsg, fsg->bulk_in, bh->inreq,
- &bh->inreq_busy, &bh->state);
- fsg->next_buffhd_to_fill = bh->next;
- } else {
- start_transfer(fsg, fsg->bulk_in, bh->inreq,
- &bh->inreq_busy, &bh->state);
- fsg->next_buffhd_to_fill = bh->next;
-#if 0
- /* this is unnecessary, and was causing problems with MacOS */
- if (bh->inreq->length > 0)
- write_zero(fsg);
-#endif
- }
- 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
- fsg_set_halt(fsg, fsg->bulk_out);
- raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
- rc = -EINTR;
-#endif
-
- /* We can't stall. Read in the excess data and throw it
- * all away. */
- else
- rc = throw_away_data(fsg);
- break;
- }
- return rc;
-}
-
-
-static int send_status(struct fsg_dev *fsg)
-{
- struct lun *curlun = fsg->curlun;
- struct fsg_buffhd *bh;
- int rc;
- u8 status = USB_STATUS_PASS;
- u32 sd, sdinfo = 0;
- struct bulk_cs_wrap *csw;
-
- DBG(fsg, "send_status\n");
- /* 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);
- }
-
- csw = bh->buf;
-
- /* Store and send the Bulk-only CSW */
- csw->Signature = __constant_cpu_to_le32(USB_BULK_CS_SIG);
- csw->Tag = fsg->tag;
- csw->Residue = cpu_to_le32(fsg->residue);
- csw->Status = status;
-
- bh->inreq->length = USB_BULK_CS_WRAP_LEN;
- start_transfer(fsg, fsg->bulk_in, bh->inreq,
- &bh->inreq_busy, &bh->state);
-
- fsg->next_buffhd_to_fill = bh->next;
- return 0;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-/* Check whether the command is properly formed and whether its data size
- * and direction agree with the values we already have. */
-static int check_command(struct fsg_dev *fsg, int cmnd_size,
- enum data_direction data_dir, unsigned int mask,
- int needs_medium, const char *name)
-{
- int i;
- int lun = fsg->cmnd[1] >> 5;
- static const char dirletter[4] = {'u', 'o', 'i', 'n'};
- char hdlen[20];
- struct lun *curlun;
-
- 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. */
- DBG(fsg, "phase error 1\n");
- 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;
- DBG(fsg, "phase error 2\n");
- return -EINVAL;
- }
-
- /* Verify the length of the command itself */
- if (cmnd_size != fsg->cmnd_size) {
-
- /* Special case workaround: MS-Windows issues REQUEST_SENSE
- * and INQUIRY commands with cbw->Length == 12 (it should be 6). */
- if ((fsg->cmnd[0] == SC_REQUEST_SENSE && fsg->cmnd_size == 12)
- || (fsg->cmnd[0] == SC_INQUIRY && fsg->cmnd_size == 12))
- cmnd_size = fsg->cmnd_size;
- else {
- fsg->phase_error = 1;
- return -EINVAL;
- }
- }
-
- /* Check that the LUN values are consistent */
- if (fsg->lun != lun)
- DBG(fsg, "using LUN %d from CBW, "
- "not LUN %d from CDB\n",
- fsg->lun, lun);
-
- /* Check the LUN */
- if (fsg->lun >= 0 && fsg->lun < fsg->nluns) {
- fsg->curlun = curlun = &fsg->luns[fsg->lun];
- if (fsg->cmnd[0] != SC_REQUEST_SENSE) {
- curlun->sense_data = SS_NO_SENSE;
- curlun->sense_data_info = 0;
- 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] != SC_INQUIRY &&
- fsg->cmnd[0] != SC_REQUEST_SENSE) {
- DBG(fsg, "unsupported LUN %d\n", fsg->lun);
- return -EINVAL;
- }
- }
-
- /* If a unit attention condition exists, only INQUIRY and
- * REQUEST SENSE commands are allowed; anything else must fail. */
- if (curlun && curlun->unit_attention_data != SS_NO_SENSE &&
- fsg->cmnd[0] != SC_INQUIRY &&
- fsg->cmnd[0] != SC_REQUEST_SENSE) {
- curlun->sense_data = curlun->unit_attention_data;
- curlun->unit_attention_data = SS_NO_SENSE;
- return -EINVAL;
- }
-
- /* Check that only command bytes listed in the mask are non-zero */
- fsg->cmnd[1] &= 0x1f; /* Mask away the LUN */
- for (i = 1; i < cmnd_size; ++i) {
- if (fsg->cmnd[i] && !(mask & (1 << i))) {
- if (curlun)
- curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
- DBG(fsg, "SS_INVALID_FIELD_IN_CDB\n");
- return -EINVAL;
- }
- }
-
- /* If the medium isn't mounted and the command needs to access
- * it, return an error. */
- if (curlun && !backing_file_is_open(curlun) && needs_medium) {
- curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
- DBG(fsg, "SS_MEDIUM_NOT_PRESENT\n");
- 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 SC_INQUIRY:
- fsg->data_size_from_cmnd = fsg->cmnd[4];
- if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
- (1<<4), 0,
- "INQUIRY")) == 0)
- reply = do_inquiry(fsg, bh);
- break;
-
- case SC_MODE_SELECT_6:
- fsg->data_size_from_cmnd = fsg->cmnd[4];
- if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
- (1<<1) | (1<<4), 0,
- "MODE SELECT(6)")) == 0)
- reply = do_mode_select(fsg, bh);
- break;
-
- case SC_MODE_SELECT_10:
- fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
- if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
- (1<<1) | (3<<7), 0,
- "MODE SELECT(10)")) == 0)
- reply = do_mode_select(fsg, bh);
- break;
-
- case SC_MODE_SENSE_6:
- fsg->data_size_from_cmnd = fsg->cmnd[4];
- if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
- (1<<1) | (1<<2) | (1<<4), 0,
- "MODE SENSE(6)")) == 0)
- reply = do_mode_sense(fsg, bh);
- break;
-
- case SC_MODE_SENSE_10:
- fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
- if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
- (1<<1) | (1<<2) | (3<<7), 0,
- "MODE SENSE(10)")) == 0)
- reply = do_mode_sense(fsg, bh);
- break;
-
- case SC_PREVENT_ALLOW_MEDIUM_REMOVAL:
- fsg->data_size_from_cmnd = 0;
- if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
- (1<<4), 0,
- "PREVENT-ALLOW MEDIUM REMOVAL")) == 0)
- reply = do_prevent_allow(fsg);
- break;
-
- case SC_READ_6:
- i = fsg->cmnd[4];
- fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
- if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
- (7<<1) | (1<<4), 1,
- "READ(6)")) == 0)
- reply = do_read(fsg);
- break;
-
- case SC_READ_10:
- fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
- if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
- (1<<1) | (0xf<<2) | (3<<7), 1,
- "READ(10)")) == 0)
- reply = do_read(fsg);
- break;
-
- case SC_READ_12:
- fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
- if ((reply = check_command(fsg, 12, DATA_DIR_TO_HOST,
- (1<<1) | (0xf<<2) | (0xf<<6), 1,
- "READ(12)")) == 0)
- reply = do_read(fsg);
- break;
-
- case SC_READ_CAPACITY:
- fsg->data_size_from_cmnd = 8;
- if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
- (0xf<<2) | (1<<8), 1,
- "READ CAPACITY")) == 0)
- reply = do_read_capacity(fsg, bh);
- break;
-
- case SC_READ_FORMAT_CAPACITIES:
- fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
- if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
- (3<<7), 1,
- "READ FORMAT CAPACITIES")) == 0)
- reply = do_read_format_capacities(fsg, bh);
- break;
-
- case SC_REQUEST_SENSE:
- fsg->data_size_from_cmnd = fsg->cmnd[4];
- if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
- (1<<4), 0,
- "REQUEST SENSE")) == 0)
- reply = do_request_sense(fsg, bh);
- break;
-
- case SC_START_STOP_UNIT:
- fsg->data_size_from_cmnd = 0;
- if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
- (1<<1) | (1<<4), 0,
- "START-STOP UNIT")) == 0)
- reply = do_start_stop(fsg);
- break;
-
- case SC_SYNCHRONIZE_CACHE:
- fsg->data_size_from_cmnd = 0;
- if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
- (0xf<<2) | (3<<7), 1,
- "SYNCHRONIZE CACHE")) == 0)
- reply = do_synchronize_cache(fsg);
- break;
-
- case SC_TEST_UNIT_READY:
- fsg->data_size_from_cmnd = 0;
- reply = check_command(fsg, 6, DATA_DIR_NONE,
- 0, 1,
- "TEST UNIT READY");
- break;
-
- /* Although optional, this command is used by MS-Windows. We
- * support a minimal version: BytChk must be 0. */
- case SC_VERIFY:
- fsg->data_size_from_cmnd = 0;
- if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
- (1<<1) | (0xf<<2) | (3<<7), 1,
- "VERIFY")) == 0)
- reply = do_verify(fsg);
- break;
-
- case SC_WRITE_6:
- i = fsg->cmnd[4];
- fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
- if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
- (7<<1) | (1<<4), 1,
- "WRITE(6)")) == 0)
- reply = do_write(fsg);
- break;
-
- case SC_WRITE_10:
- fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
- if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
- (1<<1) | (0xf<<2) | (3<<7), 1,
- "WRITE(10)")) == 0)
- reply = do_write(fsg);
- break;
-
- case SC_WRITE_12:
- fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
- if ((reply = check_command(fsg, 12, DATA_DIR_FROM_HOST,
- (1<<1) | (0xf<<2) | (0xf<<6), 1,
- "WRITE(12)")) == 0)
- reply = do_write(fsg);
- break;
-
- /* Some mandatory commands that we recognize but don't implement.
- * They don't mean much in this setting. It's left as an exercise
- * for anyone interested to implement RESERVE and RELEASE in terms
- * of Posix locks. */
- case SC_FORMAT_UNIT:
- case SC_RELEASE:
- case SC_RESERVE:
- case SC_SEND_DIAGNOSTIC:
- /* Fall through */
-
- default:
- fsg->data_size_from_cmnd = 0;
- sprintf(unknown, "Unknown x%02x", fsg->cmnd[0]);
- if ((reply = check_command(fsg, fsg->cmnd_size,
- DATA_DIR_UNKNOWN, 0xff, 0, unknown)) == 0) {
- fsg->curlun->sense_data = SS_INVALID_COMMAND;
- reply = -EINVAL;
- }
- break;
- }
- up_read(&fsg->filesem);
-
- VDBG(fsg, "reply: %d, fsg->data_size_from_cmnd: %d\n",
- reply, fsg->data_size_from_cmnd);
- if (reply == -EINTR || signal_pending(current))
- return -EINTR;
-
- /* Set up the single reply buffer for finish_reply() */
- if (reply == -EINVAL)
- reply = 0; /* Error reply length */
- if (reply >= 0 && fsg->data_dir == DATA_DIR_TO_HOST) {
- reply = min((u32) reply, fsg->data_size_from_cmnd);
- bh->inreq->length = reply;
- bh->state = BUF_STATE_FULL;
- fsg->residue -= reply;
- } /* Otherwise it's already set */
-
- return 0;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh)
-{
- struct usb_request *req = bh->outreq;
- struct bulk_cb_wrap *cbw = req->buf;
-
- /* Was this a real packet? */
- if (req->status)
- return -EINVAL;
-
- /* Is the CBW valid? */
- if (req->actual != USB_BULK_CB_WRAP_LEN ||
- cbw->Signature != __constant_cpu_to_le32(
- USB_BULK_CB_SIG)) {
- DBG(fsg, "invalid CBW: len %u sig 0x%x\n",
- req->actual,
- le32_to_cpu(cbw->Signature));
- return -EINVAL;
- }
-
- /* Is the CBW meaningful? */
- if (cbw->Lun >= 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);
- 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;
-
- /* 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) {
- usb_ep_dequeue(fsg->bulk_out, bh->outreq);
- bh->outreq_busy = 0;
- bh->state = BUF_STATE_EMPTY;
- return rc;
- }
- }
-
- /* Queue a request to read a Bulk-only CBW */
- set_bulk_out_req_length(fsg, bh, USB_BULK_CB_WRAP_LEN);
- start_transfer(fsg, fsg->bulk_out, bh->outreq,
- &bh->outreq_busy, &bh->state);
-
- /* We will drain the buffer in software, which means we
- * can reuse it for the next filling. No need to advance
- * next_buffhd_to_fill. */
-
- /* Wait for the CBW to arrive */
- while (bh->state != BUF_STATE_FULL) {
- rc = sleep_thread(fsg);
- if (rc) {
- usb_ep_dequeue(fsg->bulk_out, bh->outreq);
- bh->outreq_busy = 0;
- bh->state = BUF_STATE_EMPTY;
- return rc;
- }
- }
- smp_rmb();
- rc = received_cbw(fsg, bh);
- bh->state = BUF_STATE_EMPTY;
-
- return rc;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static int enable_endpoint(struct fsg_dev *fsg, struct usb_ep *ep,
- const struct usb_endpoint_descriptor *d)
-{
- int rc;
-
- DBG(fsg, "usb_ep_enable %s\n", ep->name);
- 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)
-{
- struct usb_composite_dev *cdev = fsg->cdev;
- int rc = 0;
- int i;
- const struct usb_endpoint_descriptor *d;
-
- if (fsg->running)
- DBG(fsg, "reset interface\n");
-reset:
- /* Disable the endpoints */
- if (fsg->bulk_in_enabled) {
- DBG(fsg, "usb_ep_disable %s\n", fsg->bulk_in->name);
- usb_ep_disable(fsg->bulk_in);
- fsg->bulk_in_enabled = 0;
- }
- if (fsg->bulk_out_enabled) {
- DBG(fsg, "usb_ep_disable %s\n", fsg->bulk_out->name);
- usb_ep_disable(fsg->bulk_out);
- fsg->bulk_out_enabled = 0;
- }
-
- /* Deallocate the requests */
- for (i = 0; i < NUM_BUFFERS; ++i) {
- struct fsg_buffhd *bh = &fsg->buffhds[i];
- if (bh->inreq) {
- usb_ep_free_request(fsg->bulk_in, bh->inreq);
- bh->inreq = NULL;
- }
- if (bh->outreq) {
- usb_ep_free_request(fsg->bulk_out, bh->outreq);
- bh->outreq = NULL;
- }
- }
-
-
- fsg->running = 0;
- if (altsetting < 0 || rc != 0)
- return rc;
-
- DBG(fsg, "set interface %d\n", altsetting);
-
- /* Enable the endpoints */
- d = ep_desc(cdev->gadget, &fs_bulk_in_desc, &hs_bulk_in_desc);
- if ((rc = enable_endpoint(fsg, fsg->bulk_in, d)) != 0)
- goto reset;
- fsg->bulk_in_enabled = 1;
-
- d = ep_desc(cdev->gadget, &fs_bulk_out_desc, &hs_bulk_out_desc);
- if ((rc = enable_endpoint(fsg, fsg->bulk_out, d)) != 0)
- goto reset;
- fsg->bulk_out_enabled = 1;
- fsg->bulk_out_maxpacket = le16_to_cpu(d->wMaxPacketSize);
-
- /* Allocate the requests */
- for (i = 0; i < NUM_BUFFERS; ++i) {
- struct fsg_buffhd *bh = &fsg->buffhds[i];
-
- rc = alloc_request(fsg, fsg->bulk_in, &bh->inreq);
- if (rc != 0)
- goto reset;
- rc = alloc_request(fsg, fsg->bulk_out, &bh->outreq);
- if (rc != 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;
- }
-
- fsg->running = 1;
- for (i = 0; i < fsg->nluns; ++i)
- fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
-
- return rc;
-}
-
-static void adjust_wake_lock(struct fsg_dev *fsg)
-{
- int ums_active = 0;
- int i;
- unsigned long flags;
-
- spin_lock_irqsave(&fsg->lock, flags);
-
- if (fsg->config) {
- for (i = 0; i < fsg->nluns; ++i) {
- if (backing_file_is_open(&fsg->luns[i]))
- ums_active = 1;
- }
- }
-
- if (ums_active)
- wake_lock(&fsg->wake_lock);
- else
- wake_unlock(&fsg->wake_lock);
-
- spin_unlock_irqrestore(&fsg->lock, flags);
-}
-
-/*
- * 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
- }
-
- switch_set_state(&fsg->sdev, new_config);
- adjust_wake_lock(fsg);
- return rc;
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static void handle_exception(struct fsg_dev *fsg)
-{
- siginfo_t info;
- int sig;
- int i;
- int num_active;
- struct fsg_buffhd *bh;
- enum fsg_state old_state;
- u8 new_config;
- struct lun *curlun;
- int rc;
- unsigned long flags;
-
- DBG(fsg, "handle_exception state: %d\n", (int)fsg->state);
- /* 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 */
- for (i = 0; i < NUM_BUFFERS; ++i) {
- bh = &fsg->buffhds[i];
- if (bh->inreq_busy)
- usb_ep_dequeue(fsg->bulk_in, bh->inreq);
- if (bh->outreq_busy)
- usb_ep_dequeue(fsg->bulk_out, bh->outreq);
- }
-
- /* Wait until everything is idle */
- for (;;) {
- num_active = 0;
- for (i = 0; i < NUM_BUFFERS; ++i) {
- bh = &fsg->buffhds[i];
- num_active += bh->outreq_busy;
- }
- if (num_active == 0)
- break;
- if (sleep_thread(fsg))
- return;
- }
-
- /*
- * Do NOT flush the fifo after set_interface()
- * Otherwise, it results in some data being lost
- */
- if ((fsg->state != FSG_STATE_CONFIG_CHANGE) ||
- (fsg->new_config != 1)) {
- /* 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);
- }
- /* Reset the I/O buffer states and pointers, the SCSI
- * state, and the exception. Then invoke the handler. */
- spin_lock_irqsave(&fsg->lock, flags);
-
- for (i = 0; i < NUM_BUFFERS; ++i) {
- bh = &fsg->buffhds[i];
- bh->state = BUF_STATE_EMPTY;
- }
- fsg->next_buffhd_to_fill = fsg->next_buffhd_to_drain =
- &fsg->buffhds[0];
-
- 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_irqrestore(&fsg->lock, flags);
-
- /* Carry out any extra actions required for the exception */
- switch (old_state) {
- default:
- break;
-
- case FSG_STATE_ABORT_BULK_OUT:
- DBG(fsg, "FSG_STATE_ABORT_BULK_OUT\n");
- spin_lock_irqsave(&fsg->lock, flags);
- if (fsg->state == FSG_STATE_STATUS_PHASE)
- fsg->state = FSG_STATE_IDLE;
- spin_unlock_irqrestore(&fsg->lock, flags);
- break;
-
- case FSG_STATE_RESET:
- /* really not much to do here */
- break;
-
- case FSG_STATE_CONFIG_CHANGE:
- rc = do_set_config(fsg, new_config);
- if (new_config == 0) {
- /* We're using the backing file */
- down_read(&fsg->filesem);
- fsync_all(fsg);
- up_read(&fsg->filesem);
- }
- break;
-
- case FSG_STATE_EXIT:
- case FSG_STATE_TERMINATED:
- do_set_config(fsg, 0); /* Free resources */
- spin_lock_irqsave(&fsg->lock, flags);
- fsg->state = FSG_STATE_TERMINATED; /* Stop the thread */
- spin_unlock_irqrestore(&fsg->lock, flags);
- break;
- }
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-static int fsg_main_thread(void *fsg_)
-{
- struct fsg_dev *fsg = fsg_;
- unsigned long flags;
-
- /* 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_irqsave(&fsg->lock, flags);
- if (!exception_in_progress(fsg))
- fsg->state = FSG_STATE_DATA_PHASE;
- spin_unlock_irqrestore(&fsg->lock, flags);
-
- if (do_scsi_command(fsg) || finish_reply(fsg))
- continue;
-
- spin_lock_irqsave(&fsg->lock, flags);
- if (!exception_in_progress(fsg))
- fsg->state = FSG_STATE_STATUS_PHASE;
- spin_unlock_irqrestore(&fsg->lock, flags);
-
- if (send_status(fsg))
- continue;
-
- spin_lock_irqsave(&fsg->lock, flags);
- if (!exception_in_progress(fsg))
- fsg->state = FSG_STATE_IDLE;
- spin_unlock_irqrestore(&fsg->lock, flags);
- }
-
- spin_lock_irqsave(&fsg->lock, flags);
- fsg->thread_task = NULL;
- spin_unlock_irqrestore(&fsg->lock, flags);
-
- /* In case we are exiting because of a signal, unregister the
- * gadget driver and close the backing file. */
- if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags))
- close_all_backing_files(fsg);
-
- /* Let the unbind and cleanup routines know the thread has exited */
- complete_and_exit(&fsg->thread_notifier, 0);
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-/* If the next two routines are called while the gadget is registered,
- * the caller must own fsg->filesem for writing. */
-
-static int open_backing_file(struct fsg_dev *fsg, struct lun *curlun,
- const char *filename)
-{
- int ro;
- struct file *filp = NULL;
- int rc = -EINVAL;
- struct inode *inode = NULL;
- loff_t size;
- loff_t num_sectors;
-
- /* R/W if we can, R/O if we must */
- ro = curlun->ro;
- if (!ro) {
- filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0);
- if (-EROFS == PTR_ERR(filp))
- ro = 1;
- }
- if (ro)
- filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0);
- if (IS_ERR(filp)) {
- LINFO(curlun, "unable to open backing file: %s\n", filename);
- return PTR_ERR(filp);
- }
-
- if (!(filp->f_mode & FMODE_WRITE))
- ro = 1;
-
- if (filp->f_path.dentry)
- inode = filp->f_path.dentry->d_inode;
- if (inode && S_ISBLK(inode->i_mode)) {
- if (bdev_read_only(inode->i_bdev))
- ro = 1;
- } else if (!inode || !S_ISREG(inode->i_mode)) {
- LINFO(curlun, "invalid file type: %s\n", filename);
- goto out;
- }
-
- /* If we can't read the file, it's no good.
- * If we can't write the file, use it read-only. */
- if (!filp->f_op || !(filp->f_op->read || filp->f_op->aio_read)) {
- LINFO(curlun, "file not readable: %s\n", filename);
- goto out;
- }
- if (!(filp->f_op->write || filp->f_op->aio_write))
- ro = 1;
-
- size = i_size_read(inode->i_mapping->host);
- if (size < 0) {
- LINFO(curlun, "unable to find file size: %s\n", filename);
- rc = (int) size;
- goto out;
- }
- num_sectors = size >> 9; /* File size in 512-byte sectors */
- if (num_sectors == 0) {
- LINFO(curlun, "file too small: %s\n", filename);
- rc = -ETOOSMALL;
- goto out;
- }
-
- get_file(filp);
- curlun->ro = ro;
- curlun->filp = filp;
- curlun->file_length = size;
- curlun->unflushed_bytes = 0;
- curlun->num_sectors = num_sectors;
- LDBG(curlun, "open backing file: %s size: %lld num_sectors: %lld\n",
- filename, size, num_sectors);
- rc = 0;
- adjust_wake_lock(fsg);
-
-out:
- filp_close(filp, current->files);
- return rc;
-}
-
-
-static void close_backing_file(struct fsg_dev *fsg, struct lun *curlun)
-{
- if (curlun->filp) {
- int rc;
-
- /*
- * XXX: San: Ugly hack here added to ensure that
- * our pages get synced to disk.
- * Also drop caches here just to be extra-safe
- */
- rc = vfs_fsync(curlun->filp, 1);
- if (rc < 0)
- printk(KERN_ERR "ums: Error syncing data (%d)\n", rc);
- /* drop_pagecache and drop_slab are no longer available */
- /* drop_pagecache(); */
- /* drop_slab(); */
-
- LDBG(curlun, "close backing file\n");
- fput(curlun->filp);
- curlun->filp = NULL;
- adjust_wake_lock(fsg);
- }
-}
-
-static void close_all_backing_files(struct fsg_dev *fsg)
-{
- int i;
-
- for (i = 0; i < fsg->nluns; ++i)
- close_backing_file(fsg, &fsg->luns[i]);
-}
-
-static ssize_t show_file(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- struct lun *curlun = dev_to_lun(dev);
- struct fsg_dev *fsg = dev_get_drvdata(dev);
- char *p;
- ssize_t rc;
-
- down_read(&fsg->filesem);
- if (backing_file_is_open(curlun)) { /* Get the complete pathname */
- p = d_path(&curlun->filp->f_path, buf, PAGE_SIZE - 1);
- if (IS_ERR(p))
- rc = PTR_ERR(p);
- else {
- rc = strlen(p);
- memmove(buf, p, rc);
- buf[rc] = '\n'; /* Add a newline */
- buf[++rc] = 0;
- }
- } else { /* No file, return 0 bytes */
- *buf = 0;
- rc = 0;
- }
- up_read(&fsg->filesem);
- return rc;
-}
-
-static ssize_t store_file(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct lun *curlun = dev_to_lun(dev);
- struct fsg_dev *fsg = dev_get_drvdata(dev);
- int rc = 0;
-
- DBG(fsg, "store_file: \"%s\"\n", buf);
-#if 0
- /* disabled because we need to allow closing the backing file if the media was removed */
- if (curlun->prevent_medium_removal && backing_file_is_open(curlun)) {
- LDBG(curlun, "eject attempt prevented\n");
- return -EBUSY; /* "Door is locked" */
- }
-#endif
-
- /* Remove a trailing newline */
- if (count > 0 && buf[count-1] == '\n')
- ((char *) buf)[count-1] = 0;
-
- /* Eject current medium */
- down_write(&fsg->filesem);
- if (backing_file_is_open(curlun)) {
- close_backing_file(fsg, curlun);
- curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT;
- }
-
- /* Load new medium */
- if (count > 0 && buf[0]) {
- rc = open_backing_file(fsg, curlun, buf);
- if (rc == 0)
- curlun->unit_attention_data =
- SS_NOT_READY_TO_READY_TRANSITION;
- }
- up_write(&fsg->filesem);
- return (rc < 0 ? rc : count);
-}
-
-
-static DEVICE_ATTR(file, 0444, show_file, store_file);
-
-/*-------------------------------------------------------------------------*/
-
-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 fsg_dev *fsg = dev_get_drvdata(dev);
-
- kref_put(&fsg->ref, fsg_release);
-}
-
-
-/*-------------------------------------------------------------------------*/
-
-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 ssize_t print_switch_name(struct switch_dev *sdev, char *buf)
-{
- return sprintf(buf, "%s\n", DRIVER_NAME);
-}
-
-static ssize_t print_switch_state(struct switch_dev *sdev, char *buf)
-{
- struct fsg_dev *fsg = container_of(sdev, struct fsg_dev, sdev);
- return sprintf(buf, "%s\n", (fsg->config ? "online" : "offline"));
-}
-
-static void
-fsg_function_unbind(struct usb_configuration *c, struct usb_function *f)
-{
- struct fsg_dev *fsg = func_to_dev(f);
- int i;
- struct lun *curlun;
-
- DBG(fsg, "fsg_function_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_file);
- 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 < NUM_BUFFERS; ++i)
- kfree(fsg->buffhds[i].buf);
- switch_dev_unregister(&fsg->sdev);
-}
-
-static int
-fsg_function_bind(struct usb_configuration *c, struct usb_function *f)
-{
- struct usb_composite_dev *cdev = c->cdev;
- struct fsg_dev *fsg = func_to_dev(f);
- int rc;
- int i;
- int id;
- struct lun *curlun;
- struct usb_ep *ep;
- char *pathbuf, *p;
-
- fsg->cdev = cdev;
- DBG(fsg, "fsg_function_bind\n");
-
- dev_attr_file.attr.mode = 0644;
-
- /* Find out how many LUNs there should be */
- i = fsg->nluns;
- if (i == 0)
- i = 1;
- if (i > MAX_LUNS) {
- ERROR(fsg, "invalid number of LUNs: %d\n", i);
- rc = -EINVAL;
- goto out;
- }
-
- /* Create the LUNs, open their backing files, and register the
- * LUN devices in sysfs. */
- fsg->luns = kzalloc(i * sizeof(struct 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->ro = 0;
- curlun->dev.release = lun_release;
- /* use "usb_mass_storage" platform device as parent if available */
- if (fsg->pdev)
- curlun->dev.parent = &fsg->pdev->dev;
- else
- curlun->dev.parent = &cdev->gadget->dev;
- dev_set_drvdata(&curlun->dev, fsg);
- dev_set_name(&curlun->dev,"lun%d", i);
-
- rc = device_register(&curlun->dev);
- if (rc != 0) {
- INFO(fsg, "failed to register LUN%d: %d\n", i, rc);
- goto out;
- }
- rc = device_create_file(&curlun->dev, &dev_attr_file);
- if (rc != 0) {
- ERROR(fsg, "device_create_file failed: %d\n", rc);
- device_unregister(&curlun->dev);
- goto out;
- }
- curlun->registered = 1;
- kref_get(&fsg->ref);
- }
-
- /* allocate interface ID(s) */
- id = usb_interface_id(c, f);
- if (id < 0)
- return id;
- intf_desc.bInterfaceNumber = id;
-
- ep = usb_ep_autoconfig(cdev->gadget, &fs_bulk_in_desc);
- if (!ep)
- goto autoconf_fail;
- ep->driver_data = fsg; /* claim the endpoint */
- fsg->bulk_in = ep;
-
- ep = usb_ep_autoconfig(cdev->gadget, &fs_bulk_out_desc);
- if (!ep)
- goto autoconf_fail;
- ep->driver_data = fsg; /* claim the endpoint */
- fsg->bulk_out = ep;
-
- rc = -ENOMEM;
-
- if (gadget_is_dualspeed(cdev->gadget)) {
- /* Assume endpoint addresses are the same for both speeds */
- hs_bulk_in_desc.bEndpointAddress =
- fs_bulk_in_desc.bEndpointAddress;
- hs_bulk_out_desc.bEndpointAddress =
- fs_bulk_out_desc.bEndpointAddress;
-
- f->hs_descriptors = hs_function;
- }
-
- /* Allocate the data buffers */
- for (i = 0; i < 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(fsg->buf_size, GFP_KERNEL);
- if (!bh->buf)
- goto out;
- bh->next = bh + 1;
- }
- fsg->buffhds[NUM_BUFFERS - 1].next = &fsg->buffhds[0];
-
- fsg->thread_task = kthread_create(fsg_main_thread, fsg,
- shortname);
- if (IS_ERR(fsg->thread_task)) {
- rc = PTR_ERR(fsg->thread_task);
- ERROR(fsg, "kthread_create failed: %d\n", rc);
- goto out;
- }
-
- INFO(fsg, "Number of LUNs=%d\n", fsg->nluns);
-
- pathbuf = kmalloc(PATH_MAX, GFP_KERNEL);
- for (i = 0; i < fsg->nluns; ++i) {
- curlun = &fsg->luns[i];
- if (backing_file_is_open(curlun)) {
- p = NULL;
- if (pathbuf) {
- p = d_path(&curlun->filp->f_path,
- pathbuf, PATH_MAX);
- if (IS_ERR(p))
- p = NULL;
- }
- LINFO(curlun, "ro=%d, file: %s\n",
- curlun->ro, (p ? p : "(error)"));
- }
- }
- kfree(pathbuf);
-
- 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:
- DBG(fsg, "fsg_function_bind failed: %d\n", rc);
- fsg->state = FSG_STATE_TERMINATED; /* The thread is dead */
- fsg_function_unbind(c, f);
- close_all_backing_files(fsg);
- return rc;
-}
-
-static int fsg_function_set_alt(struct usb_function *f,
- unsigned intf, unsigned alt)
-{
- struct fsg_dev *fsg = func_to_dev(f);
- DBG(fsg, "fsg_function_set_alt intf: %d alt: %d\n", intf, alt);
- fsg->new_config = 1;
- raise_exception(fsg, FSG_STATE_CONFIG_CHANGE);
- return 0;
-}
-
-static void fsg_function_disable(struct usb_function *f)
-{
- struct fsg_dev *fsg = func_to_dev(f);
- DBG(fsg, "fsg_function_disable\n");
- fsg->new_config = 0;
- raise_exception(fsg, FSG_STATE_CONFIG_CHANGE);
-}
-
-static int __init fsg_probe(struct platform_device *pdev)
-{
- struct usb_mass_storage_platform_data *pdata = pdev->dev.platform_data;
- struct fsg_dev *fsg = the_fsg;
-
- fsg->pdev = pdev;
- printk(KERN_INFO "fsg_probe pdata: %p\n", pdata);
-
- if (pdata) {
- if (pdata->vendor)
- fsg->vendor = pdata->vendor;
-
- if (pdata->product)
- fsg->product = pdata->product;
-
- if (pdata->release)
- fsg->release = pdata->release;
- fsg->nluns = pdata->nluns;
- }
-
- return 0;
-}
-
-static struct platform_driver fsg_platform_driver = {
- .driver = { .name = "usb_mass_storage", },
- .probe = fsg_probe,
-};
-
-int mass_storage_bind_config(struct usb_configuration *c)
-{
- int rc;
- struct fsg_dev *fsg;
-
- printk(KERN_INFO "mass_storage_bind_config\n");
- rc = fsg_alloc();
- if (rc)
- return rc;
- fsg = the_fsg;
-
- spin_lock_init(&fsg->lock);
- init_rwsem(&fsg->filesem);
- kref_init(&fsg->ref);
- init_completion(&fsg->thread_notifier);
-
- the_fsg->buf_size = BULK_BUFFER_SIZE;
- the_fsg->sdev.name = DRIVER_NAME;
- the_fsg->sdev.print_name = print_switch_name;
- the_fsg->sdev.print_state = print_switch_state;
- rc = switch_dev_register(&the_fsg->sdev);
- if (rc < 0)
- goto err_switch_dev_register;
-
- rc = platform_driver_register(&fsg_platform_driver);
- if (rc != 0)
- goto err_platform_driver_register;
-
- wake_lock_init(&the_fsg->wake_lock, WAKE_LOCK_SUSPEND,
- "usb_mass_storage");
-
- fsg->cdev = c->cdev;
- fsg->function.name = shortname;
- fsg->function.descriptors = fs_function;
- fsg->function.bind = fsg_function_bind;
- fsg->function.unbind = fsg_function_unbind;
- fsg->function.setup = fsg_function_setup;
- fsg->function.set_alt = fsg_function_set_alt;
- fsg->function.disable = fsg_function_disable;
-
- rc = usb_add_function(c, &fsg->function);
- if (rc != 0)
- goto err_usb_add_function;
-
-
- return 0;
-
-err_usb_add_function:
- wake_lock_destroy(&the_fsg->wake_lock);
- platform_driver_unregister(&fsg_platform_driver);
-err_platform_driver_register:
- switch_dev_unregister(&the_fsg->sdev);
-err_switch_dev_register:
- kref_put(&the_fsg->ref, fsg_release);
-
- return rc;
-}
-
-static struct android_usb_function mass_storage_function = {
- .name = "usb_mass_storage",
- .bind_config = mass_storage_bind_config,
-};
-
-static int __init init(void)
-{
- printk(KERN_INFO "f_mass_storage init\n");
- android_register_function(&mass_storage_function);
- return 0;
-}
-module_init(init);
-
projects / firefly-linux-kernel-4.4.55.git / commitdiff