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incubator-nuttx/drivers/usbdev/usbmsc.h

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/****************************************************************************
* drivers/usbdev/usbmsc.h
*
* Copyright (C) 2008-2013, 2015, 2017 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Mass storage class device. Bulk-only with SCSI subclass.
*
* 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.
* 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. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* 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.
*
****************************************************************************/
#ifndef __DRIVERS_USBDEV_USBMSC_H
#define __DRIVERS_USBDEV_USBMSC_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <queue.h>
#include <semaphore.h>
#include <nuttx/fs/fs.h>
#include <nuttx/usb/storage.h>
#include <nuttx/usb/usbdev.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* If the USB mass storage device is configured as part of a composite device
* then both CONFIG_USBDEV_COMPOSITE and CONFIG_USBMSC_COMPOSITE must be
* defined.
*/
#ifndef CONFIG_USBDEV_COMPOSITE
# undef CONFIG_USBMSC_COMPOSITE
#endif
#if defined(CONFIG_USBMSC_COMPOSITE) && !defined(CONFIG_USBMSC_STRBASE)
# define CONFIG_USBMSC_STRBASE (4)
#endif
/* Interface IDs. If the mass storage driver is built as a component of a
* composite device, then the interface IDs may need to be offset.
*/
#ifndef CONFIG_USBMSC_COMPOSITE
# undef CONFIG_USBMSC_IFNOBASE
# define CONFIG_USBMSC_IFNOBASE 0
#endif
#ifndef CONFIG_USBMSC_IFNOBASE
# define CONFIG_USBMSC_IFNOBASE 0
#endif
/* Number of requests in the write queue */
#ifndef CONFIG_USBMSC_NWRREQS
# define CONFIG_USBMSC_NWRREQS 4
#endif
/* Number of requests in the read queue */
#ifndef CONFIG_USBMSC_NRDREQS
# define CONFIG_USBMSC_NRDREQS 4
#endif
/* Logical endpoint numbers / max packet sizes */
#ifndef CONFIG_USBMSC_COMPOSITE
# ifndef CONFIG_USBMSC_EPBULKOUT
# warning "EPBULKOUT not defined in the configuration"
# define CONFIG_USBMSC_EPBULKOUT 2
# endif
#endif
#ifndef CONFIG_USBMSC_COMPOSITE
# ifndef CONFIG_USBMSC_EPBULKIN
# warning "EPBULKIN not defined in the configuration"
# define CONFIG_USBMSC_EPBULKIN 3
# endif
#endif
/* Packet and request buffer sizes */
#ifndef CONFIG_USBMSC_COMPOSITE
# ifndef CONFIG_USBMSC_EP0MAXPACKET
# define CONFIG_USBMSC_EP0MAXPACKET 64
# endif
#endif
#ifndef CONFIG_USBMSC_BULKINREQLEN
# ifdef CONFIG_USBDEV_DUALSPEED
# define CONFIG_USBMSC_BULKINREQLEN 512
# else
# define CONFIG_USBMSC_BULKINREQLEN 64
# endif
#else
# ifdef CONFIG_USBDEV_DUALSPEED
# if CONFIG_USBMSC_BULKINREQLEN < 512
# warning "Bulk in buffer size smaller than max packet"
# undef CONFIG_USBMSC_BULKINREQLEN
# define CONFIG_USBMSC_BULKINREQLEN 512
# endif
# else
# if CONFIG_USBMSC_BULKINREQLEN < 64
# warning "Bulk in buffer size smaller than max packet"
# undef CONFIG_USBMSC_BULKINREQLEN
# define CONFIG_USBMSC_BULKINREQLEN 64
# endif
# endif
#endif
#ifndef CONFIG_USBMSC_BULKOUTREQLEN
# ifdef CONFIG_USBDEV_DUALSPEED
# define CONFIG_USBMSC_BULKOUTREQLEN 512
# else
# define CONFIG_USBMSC_BULKOUTREQLEN 64
# endif
#else
# ifdef CONFIG_USBDEV_DUALSPEED
# if CONFIG_USBMSC_BULKOUTREQLEN < 512
# warning "Bulk in buffer size smaller than max packet"
# undef CONFIG_USBMSC_BULKOUTREQLEN
# define CONFIG_USBMSC_BULKOUTREQLEN 512
# endif
# else
# if CONFIG_USBMSC_BULKOUTREQLEN < 64
# warning "Bulk in buffer size smaller than max packet"
# undef CONFIG_USBMSC_BULKOUTREQLEN
# define CONFIG_USBMSC_BULKOUTREQLEN 64
# endif
# endif
#endif
/* Vendor and product IDs and strings */
#ifndef CONFIG_USBMSC_COMPOSITE
# ifndef CONFIG_USBMSC_VENDORID
# warning "CONFIG_USBMSC_VENDORID not defined"
# define CONFIG_USBMSC_VENDORID 0x584e
# endif
# ifndef CONFIG_USBMSC_PRODUCTID
# warning "CONFIG_USBMSC_PRODUCTID not defined"
# define CONFIG_USBMSC_PRODUCTID 0x5342
# endif
# ifndef CONFIG_USBMSC_VERSIONNO
# define CONFIG_USBMSC_VERSIONNO (0x0399)
# endif
# ifndef CONFIG_USBMSC_VENDORSTR
# warning "No Vendor string specified"
# define CONFIG_USBMSC_VENDORSTR "NuttX"
# endif
# ifndef CONFIG_USBMSC_PRODUCTSTR
# warning "No Product string specified"
# define CONFIG_USBMSC_PRODUCTSTR "USBdev Storage"
# endif
# undef CONFIG_USBMSC_SERIALSTR
# define CONFIG_USBMSC_SERIALSTR "0101"
#endif
#undef CONFIG_USBMSC_CONFIGSTR
#define CONFIG_USBMSC_CONFIGSTR "Bulk"
/* SCSI daemon */
#ifndef CONFIG_USBMSC_SCSI_PRIO
# define CONFIG_USBMSC_SCSI_PRIO 128
#endif
#ifndef CONFIG_USBMSC_SCSI_STACKSIZE
# define CONFIG_USBMSC_SCSI_STACKSIZE 2048
#endif
/* Packet and request buffer sizes */
#ifndef CONFIG_USBMSC_EP0MAXPACKET
# define CONFIG_USBMSC_EP0MAXPACKET 64
#endif
/* USB Controller */
#ifdef CONFIG_USBDEV_SELFPOWERED
# define USBMSC_SELFPOWERED USB_CONFIG_ATTR_SELFPOWER
#else
# define USBMSC_SELFPOWERED (0)
#endif
#ifdef CONFIG_USBDEV_REMOTEWAKEUP
# define USBMSC_REMOTEWAKEUP USB_CONFIG_ATTR_WAKEUP
#else
# define USBMSC_REMOTEWAKEUP (0)
#endif
#ifndef CONFIG_USBDEV_MAXPOWER
# define CONFIG_USBDEV_MAXPOWER 100
#endif
/* Current state of the worker thread */
#define USBMSC_STATE_NOTSTARTED (0) /* Thread has not yet been started */
#define USBMSC_STATE_STARTED (1) /* Started, but is not yet initialized */
#define USBMSC_STATE_IDLE (2) /* Started and waiting for commands */
#define USBMSC_STATE_CMDPARSE (3) /* Processing a received command */
#define USBMSC_STATE_CMDREAD (4) /* Processing a SCSI read command */
#define USBMSC_STATE_CMDWRITE (5) /* Processing a SCSI write command */
#define USBMSC_STATE_CMDFINISH (6) /* Finish command processing */
#define USBMSC_STATE_CMDSTATUS (7) /* Processing the final status of the command */
#define USBMSC_STATE_TERMINATED (8) /* Thread has exitted */
/* Event communicated to worker thread */
#define USBMSC_EVENT_NOEVENTS (0) /* There are no outstanding events */
#define USBMSC_EVENT_READY (1 << 0) /* Initialization is complete */
#define USBMSC_EVENT_RDCOMPLETE (1 << 1) /* A read has completed there is data to be processed */
#define USBMSC_EVENT_WRCOMPLETE (1 << 2) /* A write has completed and a request is available */
#define USBMSC_EVENT_TERMINATEREQUEST (1 << 3) /* Shutdown requested */
#define USBMSC_EVENT_DISCONNECT (1 << 4) /* USB disconnect received */
#define USBMSC_EVENT_RESET (1 << 5) /* USB storage setup reset received */
#define USBMSC_EVENT_CFGCHANGE (1 << 6) /* USB setup configuration change received */
#define USBMSC_EVENT_IFCHANGE (1 << 7) /* USB setup interface change received */
#define USBMSC_EVENT_ABORTBULKOUT (1 << 8) /* SCSI receive failure */
/* SCSI command flags (passed to usbmsc_setupcmd()) */
#define USBMSC_FLAGS_DIRMASK (0x03) /* Bits 0-1: Data direction */
#define USBMSC_FLAGS_DIRNONE (0x00) /* No data to send */
#define USBMSC_FLAGS_DIRHOST2DEVICE (0x01) /* Host-to-device */
#define USBMSC_FLAGS_DIRDEVICE2HOST (0x02) /* Device-to-host */
#define USBMSC_FLAGS_BLOCKXFR (0x04) /* Bit 2: Command is a block transfer request */
#define USBMSC_FLAGS_LUNNOTNEEDED (0x08) /* Bit 3: Command does not require a valid LUN */
#define USBMSC_FLAGS_UACOKAY (0x10) /* Bit 4: Command OK if unit attention condition */
#define USBMSC_FLAGS_RETAINSENSEDATA (0x20) /* Bit 5: Do not clear sense data */
/* Descriptors **************************************************************/
/* Big enough to hold our biggest descriptor */
#define USBMSC_MXDESCLEN (64)
#define USBMSC_MAXSTRLEN (USBMSC_MXDESCLEN-2)
/* String language */
#define USBMSC_STR_LANGUAGE (0x0409) /* en-us */
/* Descriptor strings */
#ifndef CONFIG_USBMSC_COMPOSITE
# define USBMSC_MANUFACTURERSTRID (1)
# define USBMSC_PRODUCTSTRID (2)
# define USBMSC_SERIALSTRID (3)
# define USBMSC_CONFIGSTRID (4)
# define USBMSC_INTERFACESTRID USBMSC_CONFIGSTRID
# undef CONFIG_USBMSC_STRBASE
# define CONFIG_USBMSC_STRBASE (0)
#else
# define USBMSC_INTERFACESTRID (CONFIG_USBMSC_STRBASE + 1)
#endif
#define USBMSC_LASTSTRID USBMSC_INTERFACESTRID
#define USBMSC_NSTRIDS (USBMSC_LASTSTRID - CONFIG_USBMSC_STRBASE)
/* Configuration Descriptor */
#define USBMSC_INTERFACEID (CONFIG_USBMSC_IFNOBASE + 0)
#define USBMSC_ALTINTERFACEID (0)
#define USBMSC_CONFIGIDNONE (0) /* Config ID means to return to address mode */
/* Endpoint configuration */
#define USBMSC_MKEPBULKOUT(devDesc) ((devDesc)->epno[USBMSC_EP_BULKOUT_IDX])
#define USBMSC_EPOUTBULK_ATTR (USB_EP_ATTR_XFER_BULK)
#define USBMSC_MKEPBULKIN(devDesc) (USB_DIR_IN | (devDesc)->epno[USBMSC_EP_BULKIN_IDX])
#define USBMSC_EPINBULK_ATTR (USB_EP_ATTR_XFER_BULK)
#define USBMSC_HSBULKMAXPACKET (512)
#define USBMSC_HSBULKMXPKTSHIFT (9)
#define USBMSC_HSBULKMXPKTMASK (0x000001ff)
#define USBMSC_FSBULKMAXPACKET (64)
#define USBMSC_FSBULKMXPKTSHIFT (6)
#define USBMSC_FSBULKMXPKTMASK (0x0000003f)
/* Configuration descriptor size */
#ifndef CONFIG_USBMSC_COMPOSITE
/* The size of the config descriptor: (9 + 9 + 2*7) = 32 */
# define SIZEOF_USBMSC_CFGDESC \
(USB_SIZEOF_CFGDESC + USB_SIZEOF_IFDESC + USBMSC_NENDPOINTS * USB_SIZEOF_EPDESC)
#else
/* The size of the config descriptor: (9 + 2*7) = 23 */
# define SIZEOF_USBMSC_CFGDESC \
(USB_SIZEOF_IFDESC + USBMSC_NENDPOINTS * USB_SIZEOF_EPDESC)
#endif
/* Block driver helpers *****************************************************/
#define USBMSC_DRVR_READ(l,b,s,n) \
((l)->inode->u.i_bops->read((l)->inode,b,s,n))
#define USBMSC_DRVR_WRITE(l,b,s,n) \
((l)->inode->u.i_bops->write((l)->inode,b,s,n))
#define USBMSC_DRVR_GEOMETRY(l,g) \
((l)->inode->u.i_bops->geometry((l)->inode,g))
/* Everpresent MIN/MAX macros ***********************************************/
#ifndef MIN
# define MIN(a,b) ((a) < (b) ? (a) : (b))
#endif
#ifndef MAX
# define MAX(a,b) ((a) > (b) ? (a) : (b))
#endif
/****************************************************************************
* Public Types
****************************************************************************/
/* Endpoint descriptors */
enum usbmsc_epdesc_e
{
USBMSC_EPBULKOUT = 0, /* Bulk OUT endpoint descriptor */
USBMSC_EPBULKIN /* Bulk IN endpoint descriptor */
};
/* Container to support a list of requests */
struct usbmsc_req_s
{
FAR struct usbmsc_req_s *flink; /* Implements a singly linked list */
FAR struct usbdev_req_s *req; /* The contained request */
};
/* This structure describes one LUN: */
struct usbmsc_lun_s
{
FAR struct inode *inode; /* Inode structure of open'ed block driver */
uint8_t readonly:1; /* Media is read-only */
uint8_t locked:1; /* Media removal is prevented */
uint16_t sectorsize; /* The size of one sector */
uint32_t sd; /* Sense data */
uint32_t sdinfo; /* Sense data information */
uint32_t uad; /* Unit needs attention data */
off_t startsector; /* Sector offset to start of partition */
size_t nsectors; /* Number of sectors in the partition */
};
/* Describes the overall state of one instance of the driver */
struct usbmsc_dev_s
{
FAR struct usbdev_s *usbdev; /* usbdev driver pointer (Non-null if registered) */
/* SCSI worker kernel thread interface */
pid_t thpid; /* The worker thread task ID */
sem_t thsynch; /* Used to synchronizer terminal events */
sem_t thlock; /* Used to get exclusive access to the state data */
sem_t thwaitsem; /* Used to signal worker thread */
volatile bool thwaiting; /* True: worker thread is waiting for an event */
volatile uint8_t thstate; /* State of the worker thread */
volatile uint16_t theventset; /* Set of pending events signaled to worker thread */
volatile uint8_t thvalue; /* Value passed with the event (must persist) */
/* Storage class configuration and state */
uint8_t nluns:4; /* Number of LUNs */
uint8_t config; /* Configuration number */
/* Endpoints */
FAR struct usbdev_ep_s *epbulkin; /* Bulk IN endpoint structure */
FAR struct usbdev_ep_s *epbulkout; /* Bulk OUT endpoint structure */
FAR struct usbdev_req_s *ctrlreq; /* Control request (for ep0 setup responses) */
/* SCSI command processing */
struct usbmsc_lun_s *lun; /* Currently selected LUN */
struct usbmsc_lun_s *luntab; /* Allocated table of all LUNs */
uint8_t cdb[USBMSC_MAXCDBLEN]; /* Command data (cdb[]) from CBW */
uint8_t phaseerror:1; /* Need to send phase sensing status */
uint8_t shortpacket:1; /* Host transmission stopped unexpectedly */
uint8_t cbwdir:2; /* Direction from CBW. See USBMSC_FLAGS_DIR* definitions */
uint8_t cdblen; /* Length of cdb[] from CBW */
uint8_t cbwlun; /* LUN from the CBW */
uint16_t nsectbytes; /* Bytes buffered in iobuffer[] */
uint16_t nreqbytes; /* Bytes buffered in head write requests */
uint16_t iosize; /* Size of iobuffer[] */
uint32_t cbwlen; /* Length of data from CBW */
uint32_t cbwtag; /* Tag from the CBW */
union
{
uint32_t xfrlen; /* Read/Write: Sectors remaining to be transferred */
uint32_t alloclen; /* Other device-to-host: Host allocation length */
} u;
uint32_t sector; /* Current sector (relative to lun->startsector) */
uint32_t residue; /* Untransferred amount reported in the CSW */
uint8_t *iobuffer; /* Buffer for data transfers */
/* Write request list */
struct sq_queue_s wrreqlist; /* List of empty write request containers */
struct sq_queue_s rdreqlist; /* List of filled read request containers */
struct usbdev_devinfo_s devinfo;
/* Pre-allocated write request containers. The write requests will
* be linked in a free list (wrreqlist), and used to send requests to
* EPBULKIN; Read requests will be queued in the EBULKOUT.
*/
struct usbmsc_req_s wrreqs[CONFIG_USBMSC_NWRREQS];
struct usbmsc_req_s rdreqs[CONFIG_USBMSC_NRDREQS];
};
/****************************************************************************
* Public Data
****************************************************************************/
#undef EXTERN
#if defined(__cplusplus)
# define EXTERN extern "C"
extern "C"
{
#else
# define EXTERN extern
#endif
/* String *******************************************************************/
/* Mass storage class vendor/product/serial number strings */
#ifndef CONFIG_USBMSC_COMPOSITE
EXTERN const char g_mscvendorstr[];
EXTERN const char g_mscproductstr[];
EXTERN const char g_mscserialstr[];
/* If we are using a composite device, then vendor/product/serial number strings
* are provided by the composite device logic.
*/
#else
EXTERN const char g_compvendorstr[];
EXTERN const char g_compproductstr[];
EXTERN const char g_compserialstr[];
#define g_mscvendorstr g_compvendorstr
#define g_mscproductstr g_compproductstr
#define g_mscserialstr g_compserialstr
#endif
/* Used to hand-off the state structure when the SCSI worker thread is started */
EXTERN FAR struct usbmsc_dev_s *g_usbmsc_handoff;
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: usbmsc_scsi_lock
*
* Description:
* Get exclusive access to SCSI state data.
*
****************************************************************************/
void usbmsc_scsi_lock(FAR struct usbmsc_dev_s *priv);
/****************************************************************************
* Name: usbmsc_scsi_unlock
*
* Description:
* Relinquish exclusive access to SCSI state data.
*
****************************************************************************/
#define usbmsc_scsi_unlock(priv) nxsem_post(&priv->thlock)
/*****************************************************************************
* Name: usbmsc_scsi_signal
*
* Description:
* Signal the SCSI worker thread that SCSI events need service.
*
****************************************************************************/
void usbmsc_scsi_signal(FAR struct usbmsc_dev_s *priv);
/****************************************************************************
* Name: usbmsc_synch_signal
*
* Description:
* ACK controlling tasks request for synchronization.
*
****************************************************************************/
#define usbmsc_synch_signal(priv) nxsem_post(&priv->thsynch)
/****************************************************************************
* Name: usbmsc_mkstrdesc
*
* Description:
* Construct a string descriptor
*
****************************************************************************/
struct usb_strdesc_s;
int usbmsc_mkstrdesc(uint8_t id, struct usb_strdesc_s *strdesc);
/****************************************************************************
* Name: usbmsc_getdevdesc
*
* Description:
* Return a pointer to the raw device descriptor
*
****************************************************************************/
#ifndef CONFIG_USBMSC_COMPOSITE
FAR const struct usb_devdesc_s *usbmsc_getdevdesc(void);
#endif
/****************************************************************************
* Name: usbmsc_copy_epdesc
*
* Description:
* Copies the requested Endpoint Description into the buffer given.
* Returns the number of Bytes filled in ( sizeof(struct usb_epdesc_s) ).
*
****************************************************************************/
int usbmsc_copy_epdesc(enum usbmsc_epdesc_e epid,
FAR struct usb_epdesc_s *epdesc,
FAR struct usbdev_devinfo_s *devinfo,
bool hispeed);
/****************************************************************************
* Name: usbmsc_mkcfgdesc
*
* Description:
* Construct the configuration descriptor
*
****************************************************************************/
#ifdef CONFIG_USBDEV_DUALSPEED
int16_t usbmsc_mkcfgdesc(FAR uint8_t *buf, FAR struct usbdev_devinfo_s *devinfo,
uint8_t speed, uint8_t type);
#else
int16_t usbmsc_mkcfgdesc(FAR uint8_t *buf, FAR struct usbdev_devinfo_s *devinfo);
#endif
/****************************************************************************
* Name: usbmsc_getqualdesc
*
* Description:
* Return a pointer to the raw qual descriptor
*
****************************************************************************/
#if !defined(CONFIG_USBMSC_COMPOSITE) && defined(CONFIG_USBDEV_DUALSPEED)
FAR const struct usb_qualdesc_s *usbmsc_getqualdesc(void);
#endif
/****************************************************************************
* Name: usbmsc_scsi_main
*
* Description:
* This is the main function of the USB storage worker thread. It loops
* until USB-related events occur, then processes those events accordingly
*
****************************************************************************/
int usbmsc_scsi_main(int argc, char *argv[]);
/****************************************************************************
* Name: usbmsc_setconfig
*
* Description:
* Set the device configuration by allocating and configuring endpoints and
* by allocating and queue read and write requests.
*
****************************************************************************/
int usbmsc_setconfig(FAR struct usbmsc_dev_s *priv, uint8_t config);
/****************************************************************************
* Name: usbmsc_resetconfig
*
* Description:
* Mark the device as not configured and disable all endpoints.
*
****************************************************************************/
void usbmsc_resetconfig(FAR struct usbmsc_dev_s *priv);
/****************************************************************************
* Name: usbmsc_wrcomplete
*
* Description:
* Handle completion of write request. This function probably executes
* in the context of an interrupt handler.
*
****************************************************************************/
void usbmsc_wrcomplete(FAR struct usbdev_ep_s *ep,
FAR struct usbdev_req_s *req);
/****************************************************************************
* Name: usbmsc_rdcomplete
*
* Description:
* Handle completion of read request on the bulk OUT endpoint. This
* is handled like the receipt of serial data on the "UART"
*
****************************************************************************/
void usbmsc_rdcomplete(FAR struct usbdev_ep_s *ep,
FAR struct usbdev_req_s *req);
/****************************************************************************
* Name: usbmsc_deferredresponse
*
* Description:
* Some EP0 setup request cannot be responded to immediately because they
* require some asynchronous action from the SCSI worker thread. This
* function is provided for the SCSI thread to make that deferred response.
* The specific requests that require this deferred response are:
*
* 1. USB_REQ_SETCONFIGURATION,
* 2. USB_REQ_SETINTERFACE, or
* 3. USBMSC_REQ_MSRESET
*
* In all cases, the success reponse is a zero-length packet; the failure
* response is an EP0 stall.
*
* Input Parameters:
* priv - Private state structure for this USB storage instance
* stall - true is the action failed and a stall is required
*
****************************************************************************/
void usbmsc_deferredresponse(FAR struct usbmsc_dev_s *priv, bool failed);
#undef EXTERN
#if defined(__cplusplus)
}
#endif
#endif /* __DRIVERS_USBDEV_USBMSC_H */
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