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kernel-tenderloin-3.0/drivers/usb/function/mass_storage.c
Bryan Huntsman 3f2bc4d6eb Initial Contribution 
msm-2.6.38: tag AU_LINUX_ANDROID_GINGERBREAD.02.03.04.00.142

Signed-off-by: Bryan Huntsman <bryanh@codeaurora.org>
2011-10-03 09:57:10 -07:00

3010 lines
77 KiB
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/* drivers/usb/function/mass_storage.c
*
* Function Driver for USB Mass Storage
*
* Copyright (C) 2008 Google, Inc.
* Copyright (c) 2009, Code Aurora Forum. All rights reserved.
* 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/usb/ch9.h>
#include <linux/usb/mass_storage_function.h>
#include <linux/usb_usual.h>
#include <linux/platform_device.h>
#include <linux/wakelock.h>
#include "usb_function.h"
/*-------------------------------------------------------------------------*/
#define DRIVER_NAME "usb_mass_storage"
#define MAX_LUNS 8
#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)
#define DBG(d, fmt, args...) \
dev_dbg(&(d)->pdev->dev , fmt , ## args)
#define VDBG(d, fmt, args...) \
dev_vdbg(&(d)->pdev->dev , fmt , ## args)
#define ERROR(d, fmt, args...) \
dev_err(&(d)->pdev->dev , fmt , ## args)
#define MS_WARN(d, fmt, args...) \
dev_warn(&(d)->pdev->dev , fmt , ## args)
#define INFO(d, fmt, args...) \
dev_info(&(d)->pdev->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 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
#define DELAYED_STATUS (EP0_BUFSIZE + 999) /* An impossibly large value */
/* Number of buffers for CBW, DATA and CSW */
#ifdef CONFIG_USB_CSW_HACK
#define NUM_BUFFERS 4
#else
#define NUM_BUFFERS 2
#endif
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
};
int can_stall = 1;
struct fsg_dev {
/* 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 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_endpoint *bulk_in;
struct usb_endpoint *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 platform_device *pdev;
struct switch_dev sdev;
int bound;
struct wake_lock wake_lock, wake_lock_idle;
};
static int send_status(struct fsg_dev *fsg);
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 struct usb_function fsg_function;
/*-------------------------------------------------------------------------*/
#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 */
static int fsg_set_halt(struct fsg_dev *fsg, struct usb_endpoint *ep)
{
const char *name;
if (ep == fsg->bulk_in)
name = "bulk-in";
else if (ep == fsg->bulk_out)
name = "bulk-out";
else
return -1;
DBG(fsg, "%s set halt\n", name);
return usb_ept_set_halt(ep);
}
/*-------------------------------------------------------------------------*/
/* 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;
}
/*-------------------------------------------------------------------------*/
/* There is only one interface. */
#define USB_SC_SCSI 0x06 /* Transparent SCSI */
#define USB_PR_BULK 0x50 /* Bulk-only */
static struct usb_interface_descriptor
intf_desc = {
.bLength = sizeof intf_desc,
.bDescriptorType = USB_DT_INTERFACE,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_MASS_STORAGE,
.bInterfaceSubClass = USB_SC_SCSI,
.bInterfaceProtocol = USB_PR_BULK,
};
static struct usb_endpoint_descriptor
hs_bulk_in_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.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 = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = __constant_cpu_to_le16(512),
.bInterval = 0,
};
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 = __constant_cpu_to_le16(64),
};
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 = __constant_cpu_to_le16(64),
.bInterval = 0,
};
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,
};
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,
};
/*-------------------------------------------------------------------------*/
/* 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_endpoint *ep, struct usb_request *req)
{
struct fsg_dev *fsg = the_fsg;
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 */
if (req->status == 0) {
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);
} else
bh->inreq_busy = 0;
}
static void bulk_out_complete(struct usb_endpoint *ep, struct usb_request *req)
{
struct fsg_dev *fsg = the_fsg;
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 */
if (req->status == 0) {
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);
} else
bh->outreq_busy = 0;
}
static int fsg_setup(struct usb_ctrlrequest *ctrl, void *buf,
int len, void *context)
{
struct fsg_dev *fsg = context;
int value = -EOPNOTSUPP;
u16 w_index = le16_to_cpu(ctrl->wIndex);
u16 w_value = le16_to_cpu(ctrl->wValue);
u16 w_length = le16_to_cpu(ctrl->wLength);
if (!fsg->config)
return value;
if (w_index != intf_desc.bInterfaceNumber)
return value;
/* Handle Bulk-only class-specific requests */
if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) {
switch (ctrl->bRequest) {
case USB_BULK_RESET_REQUEST:
if (ctrl->bRequestType != (USB_DIR_OUT |
USB_TYPE_CLASS | USB_RECIP_INTERFACE))
break;
if (w_value != 0) {
value = -EDOM;
break;
}
/* Raise an exception to stop the current operation
* and reinitialize our state. */
DBG(fsg, "bulk reset request\n");
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_value != 0) {
value = -EDOM;
break;
}
VDBG(fsg, "get max LUN\n");
*(u8 *) buf = fsg->nluns - 1;
value = 1;
break;
}
}
if (value == -EOPNOTSUPP)
VDBG(fsg,
"unknown class-specific control req "
"%02x.%02x v%04x i%04x l%u\n",
ctrl->bRequestType, ctrl->bRequest,
le16_to_cpu(ctrl->wValue), w_index, w_length);
return value;
}
/*-------------------------------------------------------------------------*/
/* 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_endpoint *ep,
struct usb_request *req, int *pbusy,
enum fsg_buffer_state *state)
{
int rc;
unsigned long flags;
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_ept_queue_xfer(ep, req);
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))
MS_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;
#ifdef CONFIG_USB_CSW_HACK
int csw_hack_sent = 0;
int i;
#endif
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 */
#ifdef CONFIG_USB_CSW_HACK
/*
* If the csw packet is already submmitted to the DCD,
* by marking the state of buffer as full, then by checking
* the residue, we make sure that this csw packet is not
* written on to the storage media.
*/
if (bh->state == BUF_STATE_FULL && fsg->residue) {
#else
if (bh->state == BUF_STATE_FULL) {
#endif
smp_rmb();
fsg->next_buffhd_to_drain = bh->next;
bh->state = BUF_STATE_EMPTY;
/* Did something go wrong with the transfer? */
if (bh->outreq->status != 0) {
curlun->sense_data = SS_COMMUNICATION_FAILURE;
curlun->sense_data_info = file_offset >> 9;
curlun->info_valid = 1;
break;
}
amount = bh->outreq->actual;
if (curlun->file_length - file_offset < amount) {
LERROR(curlun,
"write %u @ %llu beyond end %llu\n",
amount, (unsigned long long) file_offset,
(unsigned long long) curlun->file_length);
amount = curlun->file_length - file_offset;
}
/* Perform the write */
file_offset_tmp = file_offset;
nwritten = vfs_write(curlun->filp,
(char __user *) bh->buf,
amount, &file_offset_tmp);
VLDBG(curlun, "file write %u @ %llu -> %d\n", amount,
(unsigned long long) file_offset,
(int) nwritten);
if (signal_pending(current))
return -EINTR; /* Interrupted! */
if (nwritten < 0) {
LDBG(curlun, "error in file write: %d\n",
(int) nwritten);
nwritten = 0;
} else if (nwritten < amount) {
LDBG(curlun, "partial file write: %d/%u\n",
(int) nwritten, amount);
nwritten -= (nwritten & 511);
/* Round down to a block */
}
file_offset += nwritten;
amount_left_to_write -= nwritten;
fsg->residue -= nwritten;
/* If an error occurred, report it and its position */
if (nwritten < amount) {
#ifdef CONFIG_USB_CSW_HACK
/*
* If csw is already sent & write failure
* occured, then detach the storage media
* from the corresponding lun, and cable must
* be disconnected to recover fom this error.
*/
if (csw_hack_sent) {
if (backing_file_is_open(curlun)) {
close_backing_file(fsg, curlun);
curlun->unit_attention_data =
SS_MEDIUM_NOT_PRESENT;
}
break;
}
#endif
curlun->sense_data = SS_WRITE_ERROR;
curlun->sense_data_info = file_offset >> 9;
curlun->info_valid = 1;
break;
}
#ifdef CONFIG_USB_CSW_HACK
if ((nwritten == amount) && !csw_hack_sent) {
/*
* Check if any of the buffer is in the
* busy state, if any buffer is in busy state,
* means the complete data is not received
* yet from the host. So there is no point in
* csw right away without the complete data.
*/
for (i = 0; i < NUM_BUFFERS; i++) {
if (fsg->buffhds[i].state ==
BUF_STATE_BUSY)
break;
}
/* Check whether we received the complete
* data from the host, before sending csw */
if (!amount_left_to_req && i == NUM_BUFFERS) {
csw_hack_sent = 1;
send_status(fsg);
}
}
#endif
/* 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, filp->f_path.dentry, 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;
}
static int halt_bulk_in_endpoint(struct fsg_dev *fsg)
{
int rc;
rc = fsg_set_halt(fsg, fsg->bulk_in);
if (rc == -EAGAIN)
DBG(fsg, "delayed bulk-in endpoint halt\n");
while (rc != 0) {
if (rc != -EAGAIN) {
DBG(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_ept_set_halt(fsg->bulk_in);
}
return rc;
}
/*-------------------------------------------------------------------------*/
#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;
int i;
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 {
if (can_stall) {
bh->state = BUF_STATE_EMPTY;
for (i = 0; i < NUM_BUFFERS; ++i) {
struct fsg_buffhd
*bh = &fsg->buffhds[i];
while (bh->state != BUF_STATE_EMPTY) {
rc = sleep_thread(fsg);
if (rc)
return rc;
}
}
rc = halt_bulk_in_endpoint(fsg);
} 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 (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;
#ifdef CONFIG_USB_CSW_HACK
/* Since csw is being sent early, before
* writing on to storage media, need to set
* residue to zero,assuming that write will succeed.
*/
csw->Residue = 0;
#else
csw->Residue = cpu_to_le32(fsg->residue);
#endif
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/
* INQUIRY 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)
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)
return rc;
}
smp_rmb();
rc = received_cbw(fsg, bh);
bh->state = BUF_STATE_EMPTY;
return rc;
}
/*-------------------------------------------------------------------------*/
static int alloc_request(struct fsg_dev *fsg, struct usb_endpoint *ep,
struct usb_request **preq)
{
*preq = usb_ept_alloc_req(ep, 0);
if (*preq)
return 0;
ERROR(fsg, "can't allocate request for bulk %s\n",
(ep == fsg->bulk_in ? "IN" : "OUT"));
return -ENOMEM;
}
/*
* Reset interface setting and re-init endpoint state (toggle etc).
* Call with altsetting < 0 to disable the interface. The only other
* available altsetting is 0, which enables the interface.
*/
static int do_set_interface(struct fsg_dev *fsg, int altsetting)
{
int rc = 0;
int i;
if (fsg->running)
DBG(fsg, "reset interface\n");
reset:
/* Deallocate the requests */
for (i = 0; i < NUM_BUFFERS; ++i) {
struct fsg_buffhd *bh = &fsg->buffhds[i];
if (bh->inreq) {
usb_ept_cancel_xfer(fsg->bulk_in, bh->inreq);
usb_ept_free_req(fsg->bulk_in, bh->inreq);
bh->inreq = NULL;
}
if (bh->outreq) {
usb_ept_cancel_xfer(fsg->bulk_out, bh->outreq);
usb_ept_free_req(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);
fsg->bulk_out_maxpacket = usb_ept_get_max_packet(fsg->bulk_out);
/* 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;
if (new_config == fsg->config)
return rc;
/* 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;
rc = do_set_interface(fsg, 0);
if (rc != 0)
fsg->config = 0; /* Reset on errors */
else
INFO(fsg, "config #%d\n", fsg->config);
}
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;
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, &current->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);
}
}
/* 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);
#ifdef CONFIG_USB_CSW_HACK
/* Since status is already sent for write scsi command,
* need to skip sending status once again if it is a
* write scsi command.
*/
if (fsg->cmnd[0] == SC_WRITE_6 || fsg->cmnd[0] == SC_WRITE_10
|| fsg->cmnd[0] == SC_WRITE_12)
continue;
#endif
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->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, curlun->filp->f_path.dentry, 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 void /* __init_or_exit */ fsg_unbind(void *_ctxt)
{
struct fsg_dev *fsg = _ctxt;
int i;
struct lun *curlun;
pr_debug("%s ()\n", __func__);
if (!fsg)
return;
if (!fsg->bound)
return;
fsg->running = 0;
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);
}
/* Free the data buffers */
for (i = 0; i < NUM_BUFFERS; ++i) {
kfree(fsg->buffhds[i].buf);
fsg->buffhds[i].buf = NULL;
}
if (fsg->bulk_in) {
usb_ept_fifo_flush(fsg->bulk_in);
usb_ept_enable(fsg->bulk_in, 0);
usb_free_endpoint(fsg->bulk_in);
}
if (fsg->bulk_out) {
usb_ept_fifo_flush(fsg->bulk_out);
usb_ept_enable(fsg->bulk_out, 0);
usb_free_endpoint(fsg->bulk_out);
}
fsg->bound = 0;
}
static void fsg_bind(void *_ctxt)
{
struct fsg_dev *fsg = the_fsg;
int rc;
int i;
unsigned int ret;
struct lun *curlun;
char *pathbuf, *p;
struct usb_function *usb_func = &fsg_function;
struct usb_endpoint *ep;
dev_attr_file.attr.mode = 0644;
fsg->running = 0;
/* 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;
curlun->dev.parent = &fsg->pdev->dev;
dev_set_drvdata(&curlun->dev, fsg);
snprintf(curlun->dev.bus_id, BUS_ID_SIZE,
"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);
}
ret = usb_msm_get_next_ifc_number(usb_func);
intf_desc.bInterfaceNumber = ret;
pr_debug("%s: interface number = %d\n", __func__, ret);
ep = fsg->bulk_in = usb_alloc_endpoint(USB_DIR_IN);
hs_bulk_in_desc.bEndpointAddress = USB_DIR_IN | ep->num;
fs_bulk_in_desc.bEndpointAddress = USB_DIR_IN | ep->num;
pr_debug("%s: bulk in endpoint number = %d\n",
__func__, ep->num);
ep = fsg->bulk_out = usb_alloc_endpoint(USB_DIR_OUT);
hs_bulk_out_desc.bEndpointAddress = USB_DIR_OUT | ep->num;
fs_bulk_out_desc.bEndpointAddress = USB_DIR_OUT | ep->num;
pr_debug("%s: bulk out endpoint number = %d\n",
__func__, ep->num);
/* 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->state = FSG_STATE_IDLE;
fsg->thread_task = kthread_create(fsg_main_thread, fsg,
"USB mass_storage");
if (IS_ERR(fsg->thread_task)) {
rc = PTR_ERR(fsg->thread_task);
ERROR(fsg, "kthread_create failed: %d\n", rc);
goto out;
}
DBG(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);
fsg->bound = 1;
return;
out:
fsg->state = FSG_STATE_TERMINATED; /* The thread is dead */
fsg->bound = 1;
fsg_unbind(fsg);
close_all_backing_files(fsg);
}
static void fsg_configure(int configured, void *_ctxt)
{
struct fsg_dev *fsg = _ctxt;
if (!fsg)
return;
if (!fsg->bound)
return;
/* Clear out the controller's fifos */
if ((fsg->new_config) && (fsg->bulk_in))
usb_ept_fifo_flush(fsg->bulk_in);
if ((fsg->new_config) && (fsg->bulk_out))
usb_ept_fifo_flush(fsg->bulk_out);
if (configured) {
if (usb_msm_get_speed() == USB_SPEED_HIGH) {
usb_configure_endpoint(fsg->bulk_in, &hs_bulk_in_desc);
usb_configure_endpoint(fsg->bulk_out,
&hs_bulk_out_desc);
} else {
usb_configure_endpoint(fsg->bulk_in, &fs_bulk_in_desc);
usb_configure_endpoint(fsg->bulk_out,
&fs_bulk_out_desc);
}
usb_ept_enable(fsg->bulk_in, 1);
usb_ept_enable(fsg->bulk_out, 1);
wake_lock(&fsg->wake_lock_idle);
} else
wake_unlock(&fsg->wake_lock_idle);
fsg->new_config = configured;
raise_exception(fsg, FSG_STATE_CONFIG_CHANGE);
}
/*-------------------------------------------------------------------------*/
static struct usb_function fsg_function = {
.bind = fsg_bind,
.unbind = fsg_unbind,
.configure = fsg_configure,
.setup = fsg_setup,
.name = "mass_storage",
};
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 int __exit fsg_remove(struct platform_device *pdev)
{
struct fsg_dev *fsg = the_fsg;
usb_function_unregister(&fsg_function);
wake_lock_destroy(&fsg->wake_lock_idle);
switch_dev_unregister(&fsg->sdev);
test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags);
close_all_backing_files(fsg);
kref_put(&fsg->ref, fsg_release);
return 0;
}
static int __init fsg_probe(struct platform_device *pdev)
{
struct usb_mass_storage_platform_data *pdata = pdev->dev.platform_data;
int rc;
rc = fsg_alloc();
if (rc != 0)
return rc;
the_fsg->pdev = pdev;
the_fsg->sdev.name = DRIVER_NAME;
the_fsg->nluns = pdata->nluns;
the_fsg->buf_size = pdata->buf_size;
the_fsg->vendor = pdata->vendor;
the_fsg->product = pdata->product;
the_fsg->release = pdata->release;
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;
wake_lock_init(&the_fsg->wake_lock, WAKE_LOCK_SUSPEND,
"usb_mass_storage");
wake_lock_init(&the_fsg->wake_lock_idle, WAKE_LOCK_IDLE,
"mass_storage_hold_idle");
fsg_function.hs_descriptors = hs_function;
fsg_function.fs_descriptors = fs_function;
fsg_function.context = the_fsg;
rc = usb_function_register(&fsg_function);
if (rc != 0)
goto err_usb_function_register;
return 0;
err_usb_function_register:
switch_dev_unregister(&the_fsg->sdev);
err_switch_dev_register:
kref_put(&the_fsg->ref, fsg_release);
return rc;
}
static struct platform_driver fsg_driver = {
.probe = fsg_probe,
.remove = __exit_p(fsg_remove),
.driver = { .name = DRIVER_NAME, },
};
static int __init fsg_init(void)
{
return platform_driver_register(&fsg_driver);
}
module_init(fsg_init);
static void __exit fsg_cleanup(void)
{
platform_driver_unregister(&fsg_driver);
}
module_exit(fsg_cleanup);
MODULE_LICENSE("GPL v2");
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