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nuttx/drivers/usbhost/usbhost_storage.c
patacongo 1c99e6b36b Fix possibly deadlock condition 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3601 42af7a65-404d-4744-a932-0658087f49c3
2011-05-13 03:33:03 +00:00

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/****************************************************************************
* drivers/usbhost/usbhost_storage.c
*
* Copyright (C) 2010-2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <semaphore.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/fs.h>
#include <nuttx/arch.h>
#include <nuttx/wqueue.h>
#include <nuttx/scsi.h>
#include <nuttx/usb/usb.h>
#include <nuttx/usb/usbhost.h>
#include <nuttx/usb/storage.h>
/* Don't compile if prerequisites are not met */
#if defined(CONFIG_USBHOST) && !defined(CONFIG_USBHOST_BULK_DISABLE) && \
!defined(CONFIG_DISABLE_MOUNTPOINT) && CONFIG_NFILE_DESCRIPTORS > 0
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
#ifndef CONFIG_SCHED_WORKQUEUE
# warning "Worker thread support is required (CONFIG_SCHED_WORKQUEUE)"
#endif
/* If the create() method is called by the USB host device driver from an
* interrupt handler, then it will be unable to call kmalloc() in order to
* allocate a new class instance. If the create() method is called from the
* interrupt level, then class instances must be pre-allocated.
*/
#ifndef CONFIG_USBHOST_NPREALLOC
# define CONFIG_USBHOST_NPREALLOC 0
#endif
#if CONFIG_USBHOST_NPREALLOC > 26
# error "Currently limited to 26 devices /dev/sda-z"
#endif
/* Driver support ***********************************************************/
/* This format is used to construct the /dev/sd[n] device driver path. It
* defined here so that it will be used consistently in all places.
*/
#define DEV_FORMAT "/dev/sd%c"
#define DEV_NAMELEN 10
/* Used in usbhost_connect() */
#define USBHOST_IFFOUND 0x01
#define USBHOST_BINFOUND 0x02
#define USBHOST_BOUTFOUND 0x04
#define USBHOST_ALLFOUND 0x07
#define USBHOST_MAX_RETRIES 100
#define USBHOST_MAX_CREFS 0x7fff
/****************************************************************************
* Private Types
****************************************************************************/
/* This structure contains the internal, private state of the USB host mass
* storage class.
*/
struct usbhost_state_s
{
/* This is the externally visible portion of the state */
struct usbhost_class_s class;
/* This is an instance of the USB host driver bound to this class instance */
struct usbhost_driver_s *drvr;
/* The remainder of the fields are provide to the mass storage class */
char sdchar; /* Character identifying the /dev/sd[n] device */
volatile bool disconnected; /* TRUE: Device has been disconnected */
uint8_t ifno; /* Interface number */
int16_t crefs; /* Reference count on the driver instance */
uint16_t blocksize; /* Block size of USB mass storage device */
uint32_t nblocks; /* Number of blocks on the USB mass storage device */
sem_t exclsem; /* Used to maintain mutual exclusive access */
struct work_s work; /* For interacting with the worker thread */
FAR uint8_t *tbuffer; /* The allocated transfer buffer */
size_t tbuflen; /* Size of the allocated transfer buffer */
usbhost_ep_t bulkin; /* Bulk IN endpoint */
usbhost_ep_t bulkout; /* Bulk OUT endpoint */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Semaphores */
static void usbhost_takesem(sem_t *sem);
#define usbhost_givesem(s) sem_post(s);
/* Memory allocation services */
static inline FAR struct usbhost_state_s *usbhost_allocclass(void);
static inline void usbhost_freeclass(FAR struct usbhost_state_s *class);
/* Device name management */
static int usbhost_allocdevno(FAR struct usbhost_state_s *priv);
static void usbhost_freedevno(FAR struct usbhost_state_s *priv);
static inline void usbhost_mkdevname(FAR struct usbhost_state_s *priv, char *devname);
/* CBW/CSW debug helpers */
#if defined(CONFIG_DEBUG_USB) && defined(CONFIG_DEBUG_VERBOSE)
static void usbhost_dumpcbw(FAR struct usbstrg_cbw_s *cbw);
static void usbhost_dumpcsw(FAR struct usbstrg_csw_s *csw);
#else
# define usbhost_dumpcbw(cbw);
# define usbhost_dumpcsw(csw);
#endif
/* CBW helpers */
static inline void usbhost_requestsensecbw(FAR struct usbstrg_cbw_s *cbw);
static inline void usbhost_testunitreadycbw(FAR struct usbstrg_cbw_s *cbw);
static inline void usbhost_readcapacitycbw(FAR struct usbstrg_cbw_s *cbw);
static inline void usbhost_inquirycbw (FAR struct usbstrg_cbw_s *cbw);
static inline void usbhost_readcbw (size_t startsector, uint16_t blocksize,
unsigned int nsectors,
FAR struct usbstrg_cbw_s *cbw);
static inline void usbhost_writecbw(size_t startsector, uint16_t blocksize,
unsigned int nsectors,
FAR struct usbstrg_cbw_s *cbw);
/* Command helpers */
static inline int usbhost_maxlunreq(FAR struct usbhost_state_s *priv);
static inline int usbhost_testunitready(FAR struct usbhost_state_s *priv);
static inline int usbhost_requestsense(FAR struct usbhost_state_s *priv);
static inline int usbhost_readcapacity(FAR struct usbhost_state_s *priv);
static inline int usbhost_inquiry(FAR struct usbhost_state_s *priv);
/* Worker thread actions */
static void usbhost_destroy(FAR void *arg);
/* Helpers for usbhost_connect() */
static inline int usbhost_cfgdesc(FAR struct usbhost_state_s *priv,
FAR const uint8_t *configdesc, int desclen,
uint8_t funcaddr);
static inline int usbhost_initvolume(FAR struct usbhost_state_s *priv);
/* (Little Endian) Data helpers */
static inline uint16_t usbhost_getle16(const uint8_t *val);
static inline uint16_t usbhost_getbe16(const uint8_t *val);
static inline void usbhost_putle16(uint8_t *dest, uint16_t val);
static inline void usbhost_putbe16(uint8_t *dest, uint16_t val);
static inline uint32_t usbhost_getle32(const uint8_t *val);
static inline uint32_t usbhost_getbe32(const uint8_t *val);
static void usbhost_putle32(uint8_t *dest, uint32_t val);
static void usbhost_putbe32(uint8_t *dest, uint32_t val);
/* Transfer descriptor memory management */
static inline int usbhost_talloc(FAR struct usbhost_state_s *priv);
static inline int usbhost_tfree(FAR struct usbhost_state_s *priv);
static FAR struct usbstrg_cbw_s *usbhost_cbwalloc(FAR struct usbhost_state_s *priv);
/* struct usbhost_registry_s methods */
static struct usbhost_class_s *usbhost_create(FAR struct usbhost_driver_s *drvr,
FAR const struct usbhost_id_s *id);
/* struct usbhost_class_s methods */
static int usbhost_connect(FAR struct usbhost_class_s *class,
FAR const uint8_t *configdesc, int desclen,
uint8_t funcaddr);
static int usbhost_disconnected(FAR struct usbhost_class_s *class);
/* struct block_operations methods */
static int usbhost_open(FAR struct inode *inode);
static int usbhost_close(FAR struct inode *inode);
static ssize_t usbhost_read(FAR struct inode *inode, FAR unsigned char *buffer,
size_t startsector, unsigned int nsectors);
#ifdef CONFIG_FS_WRITABLE
static ssize_t usbhost_write(FAR struct inode *inode,
FAR const unsigned char *buffer, size_t startsector,
unsigned int nsectors);
#endif
static int usbhost_geometry(FAR struct inode *inode,
FAR struct geometry *geometry);
static int usbhost_ioctl(FAR struct inode *inode, int cmd,
unsigned long arg);
/****************************************************************************
* Private Data
****************************************************************************/
/* This structure provides the registry entry ID informatino that will be
* used to associate the USB host mass storage class to a connected USB
* device.
*/
static const const struct usbhost_id_s g_id =
{
USB_CLASS_MASS_STORAGE, /* base */
USBSTRG_SUBCLASS_SCSI, /* subclass */
USBSTRG_PROTO_BULKONLY, /* proto */
0, /* vid */
0 /* pid */
};
/* This is the USB host storage class's registry entry */
static struct usbhost_registry_s g_storage =
{
NULL, /* flink */
usbhost_create, /* create */
1, /* nids */
&g_id /* id[] */
};
/* Block driver operations. This is the interface exposed to NuttX by the
* class that permits it to behave like a block driver.
*/
static const struct block_operations g_bops =
{
usbhost_open, /* open */
usbhost_close, /* close */
usbhost_read, /* read */
#ifdef CONFIG_FS_WRITABLE
usbhost_write, /* write */
#else
NULL, /* write */
#endif
usbhost_geometry, /* geometry */
usbhost_ioctl /* ioctl */
};
/* This is an array of pre-allocated USB host storage class instances */
#if CONFIG_USBHOST_NPREALLOC > 0
static struct usbhost_state_s g_prealloc[CONFIG_USBHOST_NPREALLOC];
#endif
/* This is a list of free, pre-allocated USB host storage class instances */
#if CONFIG_USBHOST_NPREALLOC > 0
static struct usbhost_state_s *g_freelist;
#endif
/* This is a bitmap that is used to allocate device names /dev/sda-z. */
static uint32_t g_devinuse;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: usbhost_takesem
*
* Description:
* This is just a wrapper to handle the annoying behavior of semaphore
* waits that return due to the receipt of a signal.
*
****************************************************************************/
static void usbhost_takesem(sem_t *sem)
{
/* Take the semaphore (perhaps waiting) */
while (sem_wait(sem) != 0)
{
/* The only case that an error should occr here is if the wait was
* awakened by a signal.
*/
ASSERT(errno == EINTR);
}
}
/****************************************************************************
* Name: usbhost_allocclass
*
* Description:
* This is really part of the logic that implements the create() method
* of struct usbhost_registry_s. This function allocates memory for one
* new class instance.
*
* Input Parameters:
* None
*
* Returned Values:
* On success, this function will return a non-NULL instance of struct
* usbhost_class_s. NULL is returned on failure; this function will
* will fail only if there are insufficient resources to create another
* USB host class instance.
*
****************************************************************************/
#if CONFIG_USBHOST_NPREALLOC > 0
static inline FAR struct usbhost_state_s *usbhost_allocclass(void)
{
struct usbhost_state_s *priv;
irqstate_t flags;
/* We may be executing from an interrupt handler so we need to take one of
* our pre-allocated class instances from the free list.
*/
flags = irqsave();
priv = g_freelist;
if (priv)
{
g_freelist = priv->class.flink;
priv->class.flink = NULL;
}
irqrestore(flags);
ullvdbg("Allocated: %p\n", priv);;
return priv;
}
#else
static inline FAR struct usbhost_state_s *usbhost_allocclass(void)
{
FAR struct usbhost_state_s *priv;
/* We are not executing from an interrupt handler so we can just call
* kmalloc() to get memory for the class instance.
*/
DEBUGASSERT(!up_interrupt_context());
priv = (FAR struct usbhost_state_s *)kmalloc(sizeof(struct usbhost_state_s));
uvdbg("Allocated: %p\n", priv);;
return priv;
}
#endif
/****************************************************************************
* Name: usbhost_freeclass
*
* Description:
* Free a class instance previously allocated by usbhost_allocclass().
*
* Input Parameters:
* class - A reference to the class instance to be freed.
*
* Returned Values:
* None
*
****************************************************************************/
#if CONFIG_USBHOST_NPREALLOC > 0
static inline void usbhost_freeclass(FAR struct usbhost_state_s *class)
{
irqstate_t flags;
DEBUGASSERT(class != NULL);
ullvdbg("Freeing: %p\n", class);;
/* Just put the pre-allocated class structure back on the freelist */
flags = irqsave();
class->class.flink = g_freelist;
g_freelist = class;
irqrestore(flags);
}
#else
static inline void usbhost_freeclass(FAR struct usbhost_state_s *class)
{
DEBUGASSERT(class != NULL);
/* Free the class instance (calling sched_free() in case we are executing
* from an interrupt handler.
*/
uvdbg("Freeing: %p\n", class);;
kfree(class);
}
#endif
/****************************************************************************
* Name: Device name management
*
* Description:
* Some tiny functions to coordinate management of mass storage device names.
*
****************************************************************************/
static int usbhost_allocdevno(FAR struct usbhost_state_s *priv)
{
irqstate_t flags;
int devno;
flags = irqsave();
for (devno = 0; devno < 26; devno++)
{
uint32_t bitno = 1 << devno;
if ((g_devinuse & bitno) == 0)
{
g_devinuse |= bitno;
priv->sdchar = 'a' + devno;
irqrestore(flags);
return OK;
}
}
irqrestore(flags);
return -EMFILE;
}
static void usbhost_freedevno(FAR struct usbhost_state_s *priv)
{
int devno = 'a' - priv->sdchar;
if (devno >= 0 && devno < 26)
{
irqstate_t flags = irqsave();
g_devinuse &= ~(1 << devno);
irqrestore(flags);
}
}
static inline void usbhost_mkdevname(FAR struct usbhost_state_s *priv, char *devname)
{
(void)snprintf(devname, DEV_NAMELEN, DEV_FORMAT, priv->sdchar);
}
/****************************************************************************
* Name: CBW/CSW debug helpers
*
* Description:
* The following functions are helper functions used to dump CBWs and CSWs.
*
* Input Parameters:
* cbw/csw - A reference to the CBW/CSW to dump.
*
* Returned Values:
* None
*
****************************************************************************/
#if defined(CONFIG_DEBUG_USB) && defined(CONFIG_DEBUG_VERBOSE)
static void usbhost_dumpcbw(FAR struct usbstrg_cbw_s *cbw)
{
int i;
uvdbg("CBW:\n");
uvdbg(" signature: %08x\n", usbhost_getle32(cbw->signature));
uvdbg(" tag: %08x\n", usbhost_getle32(cbw->tag));
uvdbg(" datlen: %08x\n", usbhost_getle32(cbw->datlen));
uvdbg(" flags: %02x\n", cbw->flags);
uvdbg(" lun: %02x\n", cbw->lun);
uvdbg(" cdblen: %02x\n", cbw->cdblen);
uvdbg("CDB:\n");
for (i = 0; i < cbw->cdblen; i += 8)
{
uvdbg(" %02x %02x %02x %02x %02x %02x %02x %02x\n",
cbw->cdb[i], cbw->cdb[i+1], cbw->cdb[i+2], cbw->cdb[i+3],
cbw->cdb[i+4], cbw->cdb[i+5], cbw->cdb[i+6], cbw->cdb[i+7]);
}
}
static void usbhost_dumpcsw(FAR struct usbstrg_csw_s *csw)
{
uvdbg("CSW:\n");
uvdbg(" signature: %08x\n", usbhost_getle32(csw->signature));
uvdbg(" tag: %08x\n", usbhost_getle32(csw->tag));
uvdbg(" residue: %08x\n", usbhost_getle32(csw->residue));
uvdbg(" status: %02x\n", csw->status);
}
#endif
/****************************************************************************
* Name: CBW helpers
*
* Description:
* The following functions are helper functions used to format CBWs.
*
* Input Parameters:
* cbw - A reference to allocated and initialized CBW to be built.
*
* Returned Values:
* None
*
****************************************************************************/
static inline void usbhost_requestsensecbw(FAR struct usbstrg_cbw_s *cbw)
{
FAR struct scsicmd_requestsense_s *reqsense;
/* Format the CBW */
usbhost_putle32(cbw->datlen, SCSIRESP_FIXEDSENSEDATA_SIZEOF);
cbw->flags = USBSTRG_CBWFLAG_IN;
cbw->cdblen = SCSICMD_REQUESTSENSE_SIZEOF;
/* Format the CDB */
reqsense = (FAR struct scsicmd_requestsense_s *)cbw->cdb;
reqsense->opcode = SCSI_CMD_REQUESTSENSE;
reqsense->alloclen = SCSIRESP_FIXEDSENSEDATA_SIZEOF;
usbhost_dumpcbw(cbw);
}
static inline void usbhost_testunitreadycbw(FAR struct usbstrg_cbw_s *cbw)
{
/* Format the CBW */
cbw->cdblen = SCSICMD_TESTUNITREADY_SIZEOF;
/* Format the CDB */
cbw->cdb[0] = SCSI_CMD_TESTUNITREADY;
usbhost_dumpcbw(cbw);
}
static inline void usbhost_readcapacitycbw(FAR struct usbstrg_cbw_s *cbw)
{
FAR struct scsicmd_readcapacity10_s *rcap10;
/* Format the CBW */
usbhost_putle32(cbw->datlen, SCSIRESP_READCAPACITY10_SIZEOF);
cbw->flags = USBSTRG_CBWFLAG_IN;
cbw->cdblen = SCSICMD_READCAPACITY10_SIZEOF;
/* Format the CDB */
rcap10 = (FAR struct scsicmd_readcapacity10_s *)cbw->cdb;
rcap10->opcode = SCSI_CMD_READCAPACITY10;
usbhost_dumpcbw(cbw);
}
static inline void usbhost_inquirycbw (FAR struct usbstrg_cbw_s *cbw)
{
FAR struct scscicmd_inquiry_s *inq;
/* Format the CBW */
usbhost_putle32(cbw->datlen, SCSIRESP_INQUIRY_SIZEOF);
cbw->flags = USBSTRG_CBWFLAG_IN;
cbw->cdblen = SCSICMD_INQUIRY_SIZEOF;
/* Format the CDB */
inq = (FAR struct scscicmd_inquiry_s *)cbw->cdb;
inq->opcode = SCSI_CMD_INQUIRY;
usbhost_putbe16(inq->alloclen, SCSIRESP_INQUIRY_SIZEOF);
usbhost_dumpcbw(cbw);
}
static inline void
usbhost_readcbw (size_t startsector, uint16_t blocksize,
unsigned int nsectors, FAR struct usbstrg_cbw_s *cbw)
{
FAR struct scsicmd_read10_s *rd10;
/* Format the CBW */
usbhost_putle32(cbw->datlen, blocksize * nsectors);
cbw->flags = USBSTRG_CBWFLAG_IN;
cbw->cdblen = SCSICMD_READ10_SIZEOF;
/* Format the CDB */
rd10 = (FAR struct scsicmd_read10_s *)cbw->cdb;
rd10->opcode = SCSI_CMD_READ10;
usbhost_putbe32(rd10->lba, startsector);
usbhost_putbe16(rd10->xfrlen, nsectors);
usbhost_dumpcbw(cbw);
}
static inline void
usbhost_writecbw(size_t startsector, uint16_t blocksize,
unsigned int nsectors, FAR struct usbstrg_cbw_s *cbw)
{
FAR struct scsicmd_write10_s *wr10;
/* Format the CBW */
usbhost_putle32(cbw->datlen, blocksize * nsectors);
cbw->cdblen = SCSICMD_WRITE10_SIZEOF;
/* Format the CDB */
wr10 = (FAR struct scsicmd_write10_s *)cbw->cdb;
wr10->opcode = SCSI_CMD_WRITE10;
usbhost_putbe32(wr10->lba, startsector);
usbhost_putbe16(wr10->xfrlen, nsectors);
usbhost_dumpcbw(cbw);
}
/****************************************************************************
* Name: Command helpers
*
* Description:
* The following functions are helper functions used to send commands.
*
* Input Parameters:
* priv - A reference to the class instance.
*
* Returned Values:
* None
*
****************************************************************************/
static inline int usbhost_maxlunreq(FAR struct usbhost_state_s *priv)
{
FAR struct usb_ctrlreq_s *req = (FAR struct usb_ctrlreq_s *)priv->tbuffer;
DEBUGASSERT(priv && priv->tbuffer);
/* Request maximum logical unit number. NOTE: On an IN transaction, The
* req and buffer pointers passed to DRVR_CTRLIN may refer to the same
* allocated memory.
*/
uvdbg("Request maximum logical unit number\n");
memset(req, 0, sizeof(struct usb_ctrlreq_s));
req->type = USB_DIR_IN|USB_REQ_TYPE_CLASS|USB_REQ_RECIPIENT_INTERFACE;
req->req = USBSTRG_REQ_GETMAXLUN;
usbhost_putle16(req->len, 1);
return DRVR_CTRLIN(priv->drvr, req, priv->tbuffer);
}
static inline int usbhost_testunitready(FAR struct usbhost_state_s *priv)
{
FAR struct usbstrg_cbw_s *cbw;
int result;
/* Initialize a CBW (re-using the allocated transfer buffer) */
cbw = usbhost_cbwalloc(priv);
if (!cbw)
{
udbg("ERROR: Failed to create CBW\n");
return -ENOMEM;
}
/* Construct and send the CBW */
usbhost_testunitreadycbw(cbw);
result = DRVR_TRANSFER(priv->drvr, priv->bulkout,
(uint8_t*)cbw, USBSTRG_CBW_SIZEOF);
if (result == OK)
{
/* Receive the CSW */
result = DRVR_TRANSFER(priv->drvr, priv->bulkin,
priv->tbuffer, USBSTRG_CSW_SIZEOF);
if (result == OK)
{
usbhost_dumpcsw((FAR struct usbstrg_csw_s *)priv->tbuffer);
}
}
return result;
}
static inline int usbhost_requestsense(FAR struct usbhost_state_s *priv)
{
FAR struct usbstrg_cbw_s *cbw;
int result;
/* Initialize a CBW (re-using the allocated transfer buffer) */
cbw = usbhost_cbwalloc(priv);
if (!cbw)
{
udbg("ERROR: Failed to create CBW\n");
return -ENOMEM;
}
/* Construct and send the CBW */
usbhost_requestsensecbw(cbw);
result = DRVR_TRANSFER(priv->drvr, priv->bulkout,
(uint8_t*)cbw, USBSTRG_CBW_SIZEOF);
if (result == OK)
{
/* Receive the sense data response */
result = DRVR_TRANSFER(priv->drvr, priv->bulkin,
priv->tbuffer, SCSIRESP_FIXEDSENSEDATA_SIZEOF);
if (result == OK)
{
/* Receive the CSW */
result = DRVR_TRANSFER(priv->drvr, priv->bulkin,
priv->tbuffer, USBSTRG_CSW_SIZEOF);
if (result == OK)
{
usbhost_dumpcsw((FAR struct usbstrg_csw_s *)priv->tbuffer);
}
}
}
return result;
}
static inline int usbhost_readcapacity(FAR struct usbhost_state_s *priv)
{
FAR struct usbstrg_cbw_s *cbw;
FAR struct scsiresp_readcapacity10_s *resp;
int result;
/* Initialize a CBW (re-using the allocated transfer buffer) */
cbw = usbhost_cbwalloc(priv);
if (!cbw)
{
udbg("ERROR: Failed to create CBW\n");
return -ENOMEM;
}
/* Construct and send the CBW */
usbhost_readcapacitycbw(cbw);
result = DRVR_TRANSFER(priv->drvr, priv->bulkout,
(uint8_t*)cbw, USBSTRG_CBW_SIZEOF);
if (result == OK)
{
/* Receive the read capacity CBW IN response */
result = DRVR_TRANSFER(priv->drvr, priv->bulkin,
priv->tbuffer, SCSIRESP_READCAPACITY10_SIZEOF);
if (result == OK)
{
/* Save the capacity information */
resp = (FAR struct scsiresp_readcapacity10_s *)priv->tbuffer;
priv->nblocks = usbhost_getbe32(resp->lba);
priv->blocksize = usbhost_getbe32(resp->blklen);
/* Receive the CSW */
result = DRVR_TRANSFER(priv->drvr, priv->bulkin,
priv->tbuffer, USBSTRG_CSW_SIZEOF);
if (result == OK)
{
usbhost_dumpcsw((FAR struct usbstrg_csw_s *)priv->tbuffer);
}
}
}
return result;
}
static inline int usbhost_inquiry(FAR struct usbhost_state_s *priv)
{
FAR struct usbstrg_cbw_s *cbw;
FAR struct scsiresp_inquiry_s *resp;
int result;
/* Initialize a CBW (re-using the allocated transfer buffer) */
cbw = usbhost_cbwalloc(priv);
if (!cbw)
{
udbg("ERROR: Failed to create CBW\n");
return -ENOMEM;
}
/* Construct and send the CBW */
usbhost_inquirycbw(cbw);
result = DRVR_TRANSFER(priv->drvr, priv->bulkout,
(uint8_t*)cbw, USBSTRG_CBW_SIZEOF);
if (result == OK)
{
/* Receive the CBW IN response */
result = DRVR_TRANSFER(priv->drvr, priv->bulkin,
priv->tbuffer, SCSIRESP_INQUIRY_SIZEOF);
if (result == OK)
{
/* TODO: If USB debug is enabled, dump the response data here */
resp = (FAR struct scsiresp_inquiry_s *)priv->tbuffer;
/* Receive the CSW */
result = DRVR_TRANSFER(priv->drvr, priv->bulkin,
priv->tbuffer, USBSTRG_CSW_SIZEOF);
if (result == OK)
{
usbhost_dumpcsw((FAR struct usbstrg_csw_s *)priv->tbuffer);
}
}
}
return result;
}
/****************************************************************************
* Name: usbhost_destroy
*
* Description:
* The USB mass storage device has been disconnected and the refernce count
* on the USB host class instance has gone to 1.. Time to destroy the USB
* host class instance.
*
* Input Parameters:
* arg - A reference to the class instance to be destroyed.
*
* Returned Values:
* None
*
****************************************************************************/
static void usbhost_destroy(FAR void *arg)
{
FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)arg;
char devname[DEV_NAMELEN];
DEBUGASSERT(priv != NULL);
uvdbg("crefs: %d\n", priv->crefs);
/* Unregister the block driver */
usbhost_mkdevname(priv, devname);
(void)unregister_blockdriver(devname);
/* Release the device name used by this connection */
usbhost_freedevno(priv);
/* Free the bulk endpoints */
if (priv->bulkout)
{
DRVR_EPFREE(priv->drvr, priv->bulkout);
}
if (priv->bulkin)
{
DRVR_EPFREE(priv->drvr, priv->bulkin);
}
/* Free any transfer buffers */
usbhost_tfree(priv);
/* Destroy the semaphores */
sem_destroy(&priv->exclsem);
/* Disconnect the USB host device */
DRVR_DISCONNECT(priv->drvr);
/* And free the class instance. Hmmm.. this may execute on the worker
* thread and the work structure is part of what is getting freed. That
* should be okay because once the work contained is removed from the
* queue, it should not longer be accessed by the worker thread.
*/
usbhost_freeclass(priv);
}
/****************************************************************************
* Name: usbhost_cfgdesc
*
* Description:
* This function implements the connect() method of struct
* usbhost_class_s. This method is a callback into the class
* implementation. It is used to provide the device's configuration
* descriptor to the class so that the class may initialize properly
*
* Input Parameters:
* priv - The USB host class instance.
* configdesc - A pointer to a uint8_t buffer container the configuration descripor.
* desclen - The length in bytes of the configuration descriptor.
* funcaddr - The USB address of the function containing the endpoint that EP0
* controls
*
* Returned Values:
* On success, zero (OK) is returned. On a failure, a negated errno value is
* returned indicating the nature of the failure
*
* Assumptions:
* This function will *not* be called from an interrupt handler.
*
****************************************************************************/
static inline int usbhost_cfgdesc(FAR struct usbhost_state_s *priv,
FAR const uint8_t *configdesc, int desclen,
uint8_t funcaddr)
{
FAR struct usb_cfgdesc_s *cfgdesc;
FAR struct usb_desc_s *desc;
FAR struct usbhost_epdesc_s bindesc;
FAR struct usbhost_epdesc_s boutdesc;
int remaining;
uint8_t found = 0;
int ret;
DEBUGASSERT(priv != NULL &&
configdesc != NULL &&
desclen >= sizeof(struct usb_cfgdesc_s));
/* Verify that we were passed a configuration descriptor */
cfgdesc = (FAR struct usb_cfgdesc_s *)configdesc;
if (cfgdesc->type != USB_DESC_TYPE_CONFIG)
{
return -EINVAL;
}
/* Get the total length of the configuration descriptor (little endian).
* It might be a good check to get the number of interfaces here too.
*/
remaining = (int)usbhost_getle16(cfgdesc->totallen);
/* Skip to the next entry descriptor */
configdesc += cfgdesc->len;
remaining -= cfgdesc->len;
/* Loop where there are more dscriptors to examine */
while (remaining >= sizeof(struct usb_desc_s))
{
/* What is the next descriptor? */
desc = (FAR struct usb_desc_s *)configdesc;
switch (desc->type)
{
/* Interface descriptor. We really should get the number of endpoints
* from this descriptor too.
*/
case USB_DESC_TYPE_INTERFACE:
{
FAR struct usb_ifdesc_s *ifdesc = (FAR struct usb_ifdesc_s *)configdesc;
uvdbg("Interface descriptor\n");
DEBUGASSERT(remaining >= USB_SIZEOF_IFDESC);
/* Save the interface number and mark ONLY the interface found */
priv->ifno = ifdesc->ifno;
found = USBHOST_IFFOUND;
}
break;
/* Endpoint descriptor. We expect two bulk endpoints, an IN and an
* OUT.
*/
case USB_DESC_TYPE_ENDPOINT:
{
FAR struct usb_epdesc_s *epdesc = (FAR struct usb_epdesc_s *)configdesc;
uvdbg("Endpoint descriptor\n");
DEBUGASSERT(remaining >= USB_SIZEOF_EPDESC);
/* Check for a bulk endpoint. We only support the bulk-only
* protocol so I suppose anything else should really be an error.
*/
if ((epdesc->attr & USB_EP_ATTR_XFERTYPE_MASK) == USB_EP_ATTR_XFER_BULK)
{
/* Yes.. it is a bulk endpoint. IN or OUT? */
if (USB_ISEPOUT(epdesc->addr))
{
/* It is an OUT bulk endpoint. There should be only one
* bulk OUT endpoint.
*/
if ((found & USBHOST_BOUTFOUND) != 0)
{
/* Oops.. more than one endpoint. We don't know
* what to do with this.
*/
return -EINVAL;
}
found |= USBHOST_BOUTFOUND;
/* Save the bulk OUT endpoint information */
boutdesc.addr = epdesc->addr & USB_EP_ADDR_NUMBER_MASK;
boutdesc.in = false;
boutdesc.funcaddr = funcaddr;
boutdesc.xfrtype = USB_EP_ATTR_XFER_BULK;
boutdesc.interval = epdesc->interval;
boutdesc.mxpacketsize = usbhost_getle16(epdesc->mxpacketsize);
uvdbg("Bulk OUT EP addr:%d mxpacketsize:%d\n",
boutdesc.addr, boutdesc.mxpacketsize);
}
else
{
/* It is an IN bulk endpoint. There should be only one
* bulk IN endpoint.
*/
if ((found & USBHOST_BINFOUND) != 0)
{
/* Oops.. more than one endpoint. We don't know
* what to do with this.
*/
return -EINVAL;
}
found |= USBHOST_BINFOUND;
/* Save the bulk IN endpoint information */
bindesc.addr = epdesc->addr & USB_EP_ADDR_NUMBER_MASK;
bindesc.in = 1;
bindesc.funcaddr = funcaddr;
bindesc.xfrtype = USB_EP_ATTR_XFER_BULK;
bindesc.interval = epdesc->interval;
bindesc.mxpacketsize = usbhost_getle16(epdesc->mxpacketsize);
uvdbg("Bulk IN EP addr:%d mxpacketsize:%d\n",
bindesc.addr, bindesc.mxpacketsize);
}
}
}
break;
/* Other descriptors are just ignored for now */
default:
break;
}
/* If we found everything we need with this interface, then break out
* of the loop early.
*/
if (found == USBHOST_ALLFOUND)
{
break;
}
/* Increment the address of the next descriptor */
configdesc += desc->len;
remaining -= desc->len;
}
/* Sanity checking... did we find all of things that we need? Hmmm.. I wonder..
* can we work read-only or write-only if only one bulk endpoint found?
*/
if (found != USBHOST_ALLFOUND)
{
ulldbg("ERROR: Found IF:%s BIN:%s BOUT:%s\n",
(found & USBHOST_IFFOUND) != 0 ? "YES" : "NO",
(found & USBHOST_BINFOUND) != 0 ? "YES" : "NO",
(found & USBHOST_BOUTFOUND) != 0 ? "YES" : "NO");
return -EINVAL;
}
/* We are good... Allocate the endpoints */
ret = DRVR_EPALLOC(priv->drvr, &boutdesc, &priv->bulkout);
if (ret != OK)
{
udbg("ERROR: Failed to allocate Bulk OUT endpoint\n");
return ret;
}
ret = DRVR_EPALLOC(priv->drvr, &bindesc, &priv->bulkin);
if (ret != OK)
{
udbg("ERROR: Failed to allocate Bulk IN endpoint\n");
(void)DRVR_EPFREE(priv->drvr, priv->bulkout);
return ret;
}
ullvdbg("Endpoints allocated\n");
return OK;
}
/****************************************************************************
* Name: usbhost_initvolume
*
* Description:
* The USB mass storage device has been successfully connected. This
* completes the initialization operations. It is first called after the
* configuration descriptor has been received.
*
* This function is called from the connect() method. This function always
* executes on the thread of the caller of connect().
*
* Input Parameters:
* priv - A reference to the class instance.
*
* Returned Values:
* None
*
****************************************************************************/
static inline int usbhost_initvolume(FAR struct usbhost_state_s *priv)
{
FAR struct usbstrg_csw_s *csw;
unsigned int retries;
int ret = OK;
DEBUGASSERT(priv != NULL);
/* Set aside a transfer buffer for exclusive use by the mass storage driver */
ret = usbhost_talloc(priv);
if (ret != OK)
{
udbg("ERROR: Failed to allocate transfer buffer\n");
return ret;
}
/* Increment the reference count. This will prevent usbhost_destroy() from
* being called asynchronously if the device is removed.
*/
priv->crefs++;
DEBUGASSERT(priv->crefs == 2);
/* Request the maximum logical unit number */
uvdbg("Get max LUN\n");
ret = usbhost_maxlunreq(priv);
/* Wait for the unit to be ready */
for (retries = 0; retries < USBHOST_MAX_RETRIES && ret == OK; retries++)
{
uvdbg("Test unit ready, retries=%d\n", retries);
/* Send TESTUNITREADY to see the unit is ready */
ret = usbhost_testunitready(priv);
if (ret == OK)
{
/* Is the unit is ready */
csw = (FAR struct usbstrg_csw_s *)priv->tbuffer;
if (csw->status == 0)
{
/* Yes... break out of the loop */
break;
}
/* No.. Request mode sense information. The REQUEST SENSE command
* is sent only "to clear interlocked unit attention conditions."
* The returned status is ignored here.
*/
uvdbg("Request sense\n");
ret = usbhost_requestsense(priv);
}
}
/* Did the unit become ready? Did an error occur? Or did we time out? */
if (retries >= USBHOST_MAX_RETRIES)
{
udbg("ERROR: Timeout!\n");
ret = -ETIMEDOUT;
}
if (ret == OK)
{
/* Get the capacity of the volume */
uvdbg("Read capacity\n");
ret = usbhost_readcapacity(priv);
if (ret == OK)
{
/* Check the CSW for errors */
csw = (FAR struct usbstrg_csw_s *)priv->tbuffer;
if (csw->status != 0)
{
udbg("ERROR: CSW status error: %d\n", csw->status);
ret = -ENODEV;
}
}
}
/* Get information about the volume */
if (ret == OK)
{
/* Inquiry */
uvdbg("Inquiry\n");
ret = usbhost_inquiry(priv);
if (ret == OK)
{
/* Check the CSW for errors */
csw = (FAR struct usbstrg_csw_s *)priv->tbuffer;
if (csw->status != 0)
{
udbg("ERROR: CSW status error: %d\n", csw->status);
ret = -ENODEV;
}
}
}
/* Register the block driver */
if (ret == OK)
{
char devname[DEV_NAMELEN];
uvdbg("Register block driver\n");
usbhost_mkdevname(priv, devname);
ret = register_blockdriver(devname, &g_bops, 0, priv);
}
/* Check if we successfully initialized. We now have to be concerned
* about asynchronous modification of crefs because the block
* driver has been registerd.
*/
if (ret == OK)
{
usbhost_takesem(&priv->exclsem);
DEBUGASSERT(priv->crefs >= 2);
/* Decrement the reference count */
priv->crefs--;
/* Handle a corner case where (1) open() has been called so the
* reference count was > 2, but the device has been disconnected.
* In this case, the class instance needs to persist until close()
* is called.
*/
if (priv->crefs <= 1 && priv->disconnected)
{
/* The will cause the enumeration logic to disconnect
* the class driver.
*/
ret = -ENODEV;
}
/* Release the semaphore... there is a race condition here.
* Decrementing the reference count and releasing the semaphore
* allows usbhost_destroy() to execute (on the worker thread);
* the class driver instance could get destoryed before we are
* ready to handle it!
*/
usbhost_givesem(&priv->exclsem);
}
return ret;
}
/****************************************************************************
* Name: usbhost_getle16
*
* Description:
* Get a (possibly unaligned) 16-bit little endian value.
*
* Input Parameters:
* val - A pointer to the first byte of the little endian value.
*
* Returned Values:
* A uint16_t representing the whole 16-bit integer value
*
****************************************************************************/
static inline uint16_t usbhost_getle16(const uint8_t *val)
{
return (uint16_t)val[1] << 8 | (uint16_t)val[0];
}
/****************************************************************************
* Name: usbhost_getbe16
*
* Description:
* Get a (possibly unaligned) 16-bit big endian value.
*
* Input Parameters:
* val - A pointer to the first byte of the big endian value.
*
* Returned Values:
* A uint16_t representing the whole 16-bit integer value
*
****************************************************************************/
static inline uint16_t usbhost_getbe16(const uint8_t *val)
{
return (uint16_t)val[0] << 8 | (uint16_t)val[1];
}
/****************************************************************************
* Name: usbhost_putle16
*
* Description:
* Put a (possibly unaligned) 16-bit little endian value.
*
* Input Parameters:
* dest - A pointer to the first byte to save the little endian value.
* val - The 16-bit value to be saved.
*
* Returned Values:
* None
*
****************************************************************************/
static void usbhost_putle16(uint8_t *dest, uint16_t val)
{
dest[0] = val & 0xff; /* Little endian means LS byte first in byte stream */
dest[1] = val >> 8;
}
/****************************************************************************
* Name: usbhost_putbe16
*
* Description:
* Put a (possibly unaligned) 16-bit big endian value.
*
* Input Parameters:
* dest - A pointer to the first byte to save the big endian value.
* val - The 16-bit value to be saved.
*
* Returned Values:
* None
*
****************************************************************************/
static void usbhost_putbe16(uint8_t *dest, uint16_t val)
{
dest[0] = val >> 8; /* Big endian means MS byte first in byte stream */
dest[1] = val & 0xff;
}
/****************************************************************************
* Name: usbhost_getle32
*
* Description:
* Get a (possibly unaligned) 32-bit little endian value.
*
* Input Parameters:
* dest - A pointer to the first byte to save the big endian value.
* val - The 32-bit value to be saved.
*
* Returned Values:
* None
*
****************************************************************************/
static inline uint32_t usbhost_getle32(const uint8_t *val)
{
/* Little endian means LS halfword first in byte stream */
return (uint32_t)usbhost_getle16(&val[2]) << 16 | (uint32_t)usbhost_getle16(val);
}
/****************************************************************************
* Name: usbhost_getbe32
*
* Description:
* Get a (possibly unaligned) 32-bit big endian value.
*
* Input Parameters:
* dest - A pointer to the first byte to save the big endian value.
* val - The 32-bit value to be saved.
*
* Returned Values:
* None
*
****************************************************************************/
static inline uint32_t usbhost_getbe32(const uint8_t *val)
{
/* Big endian means MS halfword first in byte stream */
return (uint32_t)usbhost_getbe16(val) << 16 | (uint32_t)usbhost_getbe16(&val[2]);
}
/****************************************************************************
* Name: usbhost_putle32
*
* Description:
* Put a (possibly unaligned) 32-bit little endian value.
*
* Input Parameters:
* dest - A pointer to the first byte to save the little endian value.
* val - The 32-bit value to be saved.
*
* Returned Values:
* None
*
****************************************************************************/
static void usbhost_putle32(uint8_t *dest, uint32_t val)
{
/* Little endian means LS halfword first in byte stream */
usbhost_putle16(dest, (uint16_t)(val & 0xffff));
usbhost_putle16(dest+2, (uint16_t)(val >> 16));
}
/****************************************************************************
* Name: usbhost_putbe32
*
* Description:
* Put a (possibly unaligned) 32-bit big endian value.
*
* Input Parameters:
* dest - A pointer to the first byte to save the big endian value.
* val - The 32-bit value to be saved.
*
* Returned Values:
* None
*
****************************************************************************/
static void usbhost_putbe32(uint8_t *dest, uint32_t val)
{
/* Big endian means MS halfword first in byte stream */
usbhost_putbe16(dest, (uint16_t)(val >> 16));
usbhost_putbe16(dest+2, (uint16_t)(val & 0xffff));
}
/****************************************************************************
* Name: usbhost_talloc
*
* Description:
* Allocate transfer buffer memory.
*
* Input Parameters:
* priv - A reference to the class instance.
*
* Returned Values:
* On sucess, zero (OK) is returned. On failure, an negated errno value
* is returned to indicate the nature of the failure.
*
****************************************************************************/
static inline int usbhost_talloc(FAR struct usbhost_state_s *priv)
{
DEBUGASSERT(priv && priv->tbuffer == NULL);
return DRVR_ALLOC(priv->drvr, &priv->tbuffer, &priv->tbuflen);
}
/****************************************************************************
* Name: usbhost_tfree
*
* Description:
* Free transfer buffer memory.
*
* Input Parameters:
* priv - A reference to the class instance.
*
* Returned Values:
* On sucess, zero (OK) is returned. On failure, an negated errno value
* is returned to indicate the nature of the failure.
*
****************************************************************************/
static inline int usbhost_tfree(FAR struct usbhost_state_s *priv)
{
int result = OK;
DEBUGASSERT(priv);
if (priv->tbuffer)
{
DEBUGASSERT(priv->drvr);
result = DRVR_FREE(priv->drvr, priv->tbuffer);
priv->tbuffer = NULL;
priv->tbuflen = 0;
}
return result;
}
/****************************************************************************
* Name: usbhost_cbwalloc
*
* Description:
* Initialize a CBW (re-using the allocated transfer buffer). Upon
* successful return, the CBW is cleared and has the CBW signature in place.
*
* Input Parameters:
* priv - A reference to the class instance.
*
* Returned Values:
* None
*
****************************************************************************/
static FAR struct usbstrg_cbw_s *usbhost_cbwalloc(FAR struct usbhost_state_s *priv)
{
FAR struct usbstrg_cbw_s *cbw = NULL;
DEBUGASSERT(priv->tbuffer && priv->tbuflen >= sizeof(struct usbstrg_cbw_s))
/* Intialize the CBW sructure */
cbw = (FAR struct usbstrg_cbw_s *)priv->tbuffer;
memset(cbw, 0, sizeof(struct usbstrg_cbw_s));
usbhost_putle32(cbw->signature, USBSTRG_CBW_SIGNATURE);
return cbw;
}
/****************************************************************************
* struct usbhost_registry_s methods
****************************************************************************/
/****************************************************************************
* Name: usbhost_create
*
* Description:
* This function implements the create() method of struct usbhost_registry_s.
* The create() method is a callback into the class implementation. It is
* used to (1) create a new instance of the USB host class state and to (2)
* bind a USB host driver "session" to the class instance. Use of this
* create() method will support environments where there may be multiple
* USB ports and multiple USB devices simultaneously connected.
*
* Input Parameters:
* drvr - An instance of struct usbhost_driver_s that the class
* implementation will "bind" to its state structure and will
* subsequently use to communicate with the USB host driver.
* id - In the case where the device supports multiple base classes,
* subclasses, or protocols, this specifies which to configure for.
*
* Returned Values:
* On success, this function will return a non-NULL instance of struct
* usbhost_class_s that can be used by the USB host driver to communicate
* with the USB host class. NULL is returned on failure; this function
* will fail only if the drvr input parameter is NULL or if there are
* insufficient resources to create another USB host class instance.
*
****************************************************************************/
static FAR struct usbhost_class_s *usbhost_create(FAR struct usbhost_driver_s *drvr,
FAR const struct usbhost_id_s *id)
{
FAR struct usbhost_state_s *priv;
/* Allocate a USB host mass storage class instance */
priv = usbhost_allocclass();
if (priv)
{
/* Initialize the allocated storage class instance */
memset(priv, 0, sizeof(struct usbhost_state_s));
/* Assign a device number to this class instance */
if (usbhost_allocdevno(priv) == OK)
{
/* Initialize class method function pointers */
priv->class.connect = usbhost_connect;
priv->class.disconnected = usbhost_disconnected;
/* The initial reference count is 1... One reference is held by the driver */
priv->crefs = 1;
/* Initialize semphores (this works okay in the interrupt context) */
sem_init(&priv->exclsem, 0, 1);
/* Bind the driver to the storage class instance */
priv->drvr = drvr;
/* NOTE: We do not yet know the geometry of the USB mass storage device */
/* Return the instance of the USB mass storage class */
return &priv->class;
}
}
/* An error occurred. Free the allocation and return NULL on all failures */
if (priv)
{
usbhost_freeclass(priv);
}
return NULL;
}
/****************************************************************************
* struct usbhost_class_s methods
****************************************************************************/
/****************************************************************************
* Name: usbhost_connect
*
* Description:
* This function implements the connect() method of struct
* usbhost_class_s. This method is a callback into the class
* implementation. It is used to provide the device's configuration
* descriptor to the class so that the class may initialize properly
*
* Input Parameters:
* class - The USB host class entry previously obtained from a call to create().
* configdesc - A pointer to a uint8_t buffer container the configuration descripor.
* desclen - The length in bytes of the configuration descriptor.
* funcaddr - The USB address of the function containing the endpoint that EP0
* controls
*
* Returned Values:
* On success, zero (OK) is returned. On a failure, a negated errno value is
* returned indicating the nature of the failure
*
* NOTE that the class instance remains valid upon return with a failure. It is
* the responsibility of the higher level enumeration logic to call
* CLASS_DISCONNECTED to free up the class driver resources.
*
* Assumptions:
* - This function will *not* be called from an interrupt handler.
* - If this function returns an error, the USB host controller driver
* must call to DISCONNECTED method to recover from the error
*
****************************************************************************/
static int usbhost_connect(FAR struct usbhost_class_s *class,
FAR const uint8_t *configdesc, int desclen,
uint8_t funcaddr)
{
FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)class;
int ret;
DEBUGASSERT(priv != NULL &&
configdesc != NULL &&
desclen >= sizeof(struct usb_cfgdesc_s));
/* Parse the configuration descriptor to get the bulk I/O endpoints */
ret = usbhost_cfgdesc(priv, configdesc, desclen, funcaddr);
if (ret != OK)
{
udbg("usbhost_cfgdesc() failed: %d\n", ret);
}
else
{
/* Now configure the LUNs and register the block driver(s) */
ret = usbhost_initvolume(priv);
if (ret != OK)
{
udbg("usbhost_initvolume() failed: %d\n", ret);
}
}
return ret;
}
/****************************************************************************
* Name: usbhost_disconnected
*
* Description:
* This function implements the disconnected() method of struct
* usbhost_class_s. This method is a callback into the class
* implementation. It is used to inform the class that the USB device has
* been disconnected.
*
* Input Parameters:
* class - The USB host class entry previously obtained from a call to
* create().
*
* Returned Values:
* On success, zero (OK) is returned. On a failure, a negated errno value
* is returned indicating the nature of the failure
*
* Assumptions:
* This function may be called from an interrupt handler.
*
****************************************************************************/
static int usbhost_disconnected(struct usbhost_class_s *class)
{
FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)class;
irqstate_t flags;
DEBUGASSERT(priv != NULL);
/* Set an indication to any users of the mass storage device that the device
* is no longer available.
*/
flags = irqsave();
priv->disconnected = true;
/* Now check the number of references on the class instance. If it is one,
* then we can free the class instance now. Otherwise, we will have to
* wait until the holders of the references free them by closing the
* block driver.
*/
ullvdbg("crefs: %d\n", priv->crefs);
if (priv->crefs == 1)
{
/* Destroy the class instance. If we are executing from an interrupt
* handler, then defer the destruction to the worker thread.
* Otherwise, destroy the instance now.
*/
if (up_interrupt_context())
{
/* Destroy the instance on the worker thread. */
uvdbg("Queuing destruction: worker %p->%p\n", priv->work.worker, usbhost_destroy);
DEBUGASSERT(priv->work.worker == NULL);
(void)work_queue(&priv->work, usbhost_destroy, priv, 0);
}
else
{
/* Do the work now */
usbhost_destroy(priv);
}
}
irqrestore(flags);
return OK;
}
/****************************************************************************
* struct block_operations methods
****************************************************************************/
/****************************************************************************
* Name: usbhost_open
*
* Description: Open the block device
*
****************************************************************************/
static int usbhost_open(FAR struct inode *inode)
{
FAR struct usbhost_state_s *priv;
irqstate_t flags;
int ret;
uvdbg("Entry\n");
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct usbhost_state_s *)inode->i_private;
/* Make sure that we have exclusive access to the private data structure */
DEBUGASSERT(priv->crefs > 0 && priv->crefs < USBHOST_MAX_CREFS);
usbhost_takesem(&priv->exclsem);
/* Check if the mass storage device is still connected. We need to disable
* interrupts momentarily to assure that there are no asynchronous disconnect
* events.
*/
flags = irqsave();
if (priv->disconnected)
{
/* No... the block driver is no longer bound to the class. That means that
* the USB storage device is no longer connected. Refuse any further
* attempts to open the driver.
*/
ret = -ENODEV;
}
else
{
/* Otherwise, just increment the reference count on the driver */
priv->crefs++;
ret = OK;
}
irqrestore(flags);
usbhost_givesem(&priv->exclsem);
return ret;
}
/****************************************************************************
* Name: usbhost_close
*
* Description: close the block device
*
****************************************************************************/
static int usbhost_close(FAR struct inode *inode)
{
FAR struct usbhost_state_s *priv;
irqstate_t flags;
uvdbg("Entry\n");
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct usbhost_state_s *)inode->i_private;
/* Decrement the reference count on the block driver */
DEBUGASSERT(priv->crefs > 1);
usbhost_takesem(&priv->exclsem);
priv->crefs--;
/* Release the semaphore. The following operations when crefs == 1 are
* safe because we know that there is no outstanding open references to
* the block driver.
*/
usbhost_givesem(&priv->exclsem);
/* We need to disable interrupts momentarily to assure that there are
* no asynchronous disconnect events.
*/
flags = irqsave();
/* Check if the USB mass storage device is still connected. If the
* storage device is not connected and the reference count just
* decremented to one, then unregister the block driver and free
* the class instance.
*/
if (priv->crefs <= 1 && priv->disconnected)
{
/* Destroy the class instance */
DEBUGASSERT(priv->crefs == 1);
usbhost_destroy(priv);
}
irqrestore(flags);
return OK;
}
/****************************************************************************
* Name: usbhost_read
*
* Description:
* Read the specified numer of sectors from the read-ahead buffer or from
* the physical device.
*
****************************************************************************/
static ssize_t usbhost_read(FAR struct inode *inode, unsigned char *buffer,
size_t startsector, unsigned int nsectors)
{
FAR struct usbhost_state_s *priv;
ssize_t ret = 0;
int result;
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct usbhost_state_s *)inode->i_private;
uvdbg("startsector: %d nsectors: %d sectorsize: %d\n",
startsector, nsectors, priv->blocksize);
/* Check if the mass storage device is still connected */
if (priv->disconnected)
{
/* No... the block driver is no longer bound to the class. That means that
* the USB storage device is no longer connected. Refuse any attempt to read
* from the device.
*/
ret = -ENODEV;
}
else if (nsectors > 0)
{
FAR struct usbstrg_cbw_s *cbw;
usbhost_takesem(&priv->exclsem);
/* Assume allocation failure */
ret = -ENOMEM;
/* Initialize a CBW (re-using the allocated transfer buffer) */
cbw = usbhost_cbwalloc(priv);
if (cbw)
{
/* Assume some device failure */
ret = -ENODEV;
/* Construct and send the CBW */
usbhost_readcbw(startsector, priv->blocksize, nsectors, cbw);
result = DRVR_TRANSFER(priv->drvr, priv->bulkout,
(uint8_t*)cbw, USBSTRG_CBW_SIZEOF);
if (result == OK)
{
/* Receive the user data */
result = DRVR_TRANSFER(priv->drvr, priv->bulkin,
buffer, priv->blocksize * nsectors);
if (result == OK)
{
/* Receive the CSW */
result = DRVR_TRANSFER(priv->drvr, priv->bulkin,
priv->tbuffer, USBSTRG_CSW_SIZEOF);
if (result == OK)
{
FAR struct usbstrg_csw_s *csw;
/* Check the CSW status */
csw = (FAR struct usbstrg_csw_s *)priv->tbuffer;
if (csw->status == 0)
{
ret = nsectors;
}
}
}
}
}
usbhost_givesem(&priv->exclsem);
}
/* On success, return the number of blocks read */
return ret;
}
/****************************************************************************
* Name: usbhost_write
*
* Description:
* Write the specified number of sectors to the write buffer or to the
* physical device.
*
****************************************************************************/
#ifdef CONFIG_FS_WRITABLE
static ssize_t usbhost_write(FAR struct inode *inode, const unsigned char *buffer,
size_t startsector, unsigned int nsectors)
{
FAR struct usbhost_state_s *priv;
ssize_t ret;
int result;
uvdbg("sector: %d nsectors: %d sectorsize: %d\n");
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct usbhost_state_s *)inode->i_private;
/* Check if the mass storage device is still connected */
if (priv->disconnected)
{
/* No... the block driver is no longer bound to the class. That means that
* the USB storage device is no longer connected. Refuse any attempt to
* write to the device.
*/
ret = -ENODEV;
}
else
{
FAR struct usbstrg_cbw_s *cbw;
usbhost_takesem(&priv->exclsem);
/* Assume allocation failure */
ret = -ENOMEM;
/* Initialize a CBW (re-using the allocated transfer buffer) */
cbw = usbhost_cbwalloc(priv);
if (cbw)
{
/* Assume some device failure */
ret = -ENODEV;
/* Construct and send the CBW */
usbhost_writecbw(startsector, priv->blocksize, nsectors, cbw);
result = DRVR_TRANSFER(priv->drvr, priv->bulkout,
(uint8_t*)cbw, USBSTRG_CBW_SIZEOF);
if (result == OK)
{
/* Send the user data */
result = DRVR_TRANSFER(priv->drvr, priv->bulkout,
(uint8_t*)buffer, priv->blocksize * nsectors);
if (result == OK)
{
/* Receive the CSW */
result = DRVR_TRANSFER(priv->drvr, priv->bulkin,
priv->tbuffer, USBSTRG_CSW_SIZEOF);
if (result == OK)
{
FAR struct usbstrg_csw_s *csw;
/* Check the CSW status */
csw = (FAR struct usbstrg_csw_s *)priv->tbuffer;
if (csw->status == 0)
{
ret = nsectors;
}
}
}
}
}
usbhost_givesem(&priv->exclsem);
}
/* On success, return the number of blocks written */
return ret;
}
#endif
/****************************************************************************
* Name: usbhost_geometry
*
* Description: Return device geometry
*
****************************************************************************/
static int usbhost_geometry(FAR struct inode *inode, struct geometry *geometry)
{
FAR struct usbhost_state_s *priv;
int ret = -EINVAL;
uvdbg("Entry\n");
DEBUGASSERT(inode && inode->i_private);
/* Check if the mass storage device is still connected */
priv = (FAR struct usbhost_state_s *)inode->i_private;
if (priv->disconnected)
{
/* No... the block driver is no longer bound to the class. That means that
* the USB storage device is no longer connected. Refuse to return any
* geometry info.
*/
ret = -ENODEV;
}
else if (geometry)
{
/* Return the geometry of the USB mass storage device */
usbhost_takesem(&priv->exclsem);
geometry->geo_available = true;
geometry->geo_mediachanged = false;
#ifdef CONFIG_FS_WRITABLE
geometry->geo_writeenabled = true;
#else
geometry->geo_writeenabled = false;
#endif
geometry->geo_nsectors = priv->nblocks;
geometry->geo_sectorsize = priv->blocksize;
usbhost_givesem(&priv->exclsem);
uvdbg("nsectors: %ld sectorsize: %d\n",
(long)geometry->geo_nsectors, geometry->geo_sectorsize);
ret = OK;
}
return ret;
}
/****************************************************************************
* Name: usbhost_ioctl
*
* Description: Return device geometry
*
****************************************************************************/
static int usbhost_ioctl(FAR struct inode *inode, int cmd, unsigned long arg)
{
FAR struct usbhost_state_s *priv;
int ret;
uvdbg("Entry\n");
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct usbhost_state_s *)inode->i_private;
/* Check if the mass storage device is still connected */
if (priv->disconnected)
{
/* No... the block driver is no longer bound to the class. That means that
* the USB storage device is no longer connected. Refuse to process any
* ioctl commands.
*/
ret = -ENODEV;
}
else
{
/* Process the IOCTL by command */
usbhost_takesem(&priv->exclsem);
switch (cmd)
{
/* Add support for ioctl commands here */
default:
ret = -ENOTTY;
break;
}
usbhost_givesem(&priv->exclsem);
}
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: usbhost_storageinit
*
* Description:
* Initialize the USB host storage class. This function should be called
* be platform-specific code in order to initialize and register support
* for the USB host storage class.
*
* Input Parameters:
* None
*
* Returned Values:
* On success this function will return zero (OK); A negated errno value
* will be returned on failure.
*
****************************************************************************/
int usbhost_storageinit(void)
{
/* If we have been configured to use pre-allocated storage class instances,
* then place all of the pre-allocated USB host storage class instances
* into a free list.
*/
#if CONFIG_USBHOST_NPREALLOC > 0
int i;
g_freelist = NULL;
for (i = 0; i < CONFIG_USBHOST_NPREALLOC; i++)
{
struct usbhost_state_s *class = &g_prealloc[i];
class->class.flink = g_freelist;
g_freelist = class;
}
#endif
/* Advertise our availability to support (certain) mass storage devices */
return usbhost_registerclass(&g_storage);
}
#endif /* CONFIG_USBHOST && !CONFIG_USBHOST_BULK_DISABLE && !CONFIG_DISABLE_MOUNTPOINT && CONFIG_NFILE_DESCRIPTORS > 0 */
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