/**************************************************************************** * drivers/usbhost/usbhost_storage.c * * Copyright (C) 2010-2013, 2015-2017 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* 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 kmm_malloc() 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_RETRY_USEC (50*1000) /* Retry each 50 milliseconds */ #define USBHOST_MAX_RETRIES 100 /* Give up after 5 seconds */ #define USBHOST_MAX_CREFS INT16_MAX /* Max cref count before signed overflow */ /**************************************************************************** * 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 usbclass; /* 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 */ }; /* This is how struct usbhost_state_s looks to the free list logic */ struct usbhost_freestate_s { FAR struct usbhost_freestate_s *flink; }; /**************************************************************************** * Private Function Prototypes ****************************************************************************/ /* Semaphores */ static void usbhost_takesem(sem_t *sem); #define usbhost_givesem(s) nxsem_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 *usbclass); /* 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, FAR char *devname); /* CBW/CSW debug helpers */ #if defined(CONFIG_DEBUG_USB) && defined(CONFIG_DEBUG_INFO) static void usbhost_dumpcbw(FAR struct usbmsc_cbw_s *cbw); static void usbhost_dumpcsw(FAR struct usbmsc_csw_s *csw); #else # define usbhost_dumpcbw(cbw); # define usbhost_dumpcsw(csw); #endif /* CBW helpers */ static inline void usbhost_requestsensecbw(FAR struct usbmsc_cbw_s *cbw); static inline void usbhost_testunitreadycbw(FAR struct usbmsc_cbw_s *cbw); static inline void usbhost_readcapacitycbw(FAR struct usbmsc_cbw_s *cbw); static inline void usbhost_inquirycbw (FAR struct usbmsc_cbw_s *cbw); static inline void usbhost_readcbw (size_t startsector, uint16_t blocksize, unsigned int nsectors, FAR struct usbmsc_cbw_s *cbw); static inline void usbhost_writecbw(size_t startsector, uint16_t blocksize, unsigned int nsectors, FAR struct usbmsc_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); 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 usbmsc_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_hubport_s *hport, FAR const struct usbhost_id_s *id); /* struct usbhost_class_s methods */ static int usbhost_connect(FAR struct usbhost_class_s *usbclass, FAR const uint8_t *configdesc, int desclen); static int usbhost_disconnected(FAR struct usbhost_class_s *usbclass); /* 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 information 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 */ USBMSC_SUBCLASS_SCSI, /* subclass */ USBMSC_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 FAR struct usbhost_freestate_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) { int ret; do { /* Take the semaphore (perhaps waiting) */ ret = nxsem_wait(sem); /* The only case that an error should occur here is if the wait was * awakened by a signal. */ DEBUGASSERT(ret == OK || ret == -EINTR); } while (ret == -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 Value: * 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) { FAR struct usbhost_freestate_s *entry; 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 = enter_critical_section(); entry = g_freelist; if (entry) { g_freelist = entry->flink; } leave_critical_section(flags); uinfo("Allocated: %p\n", entry); return (FAR struct usbhost_state_s *)entry; } #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 * kmm_malloc() to get memory for the class instance. */ DEBUGASSERT(!up_interrupt_context()); priv = (FAR struct usbhost_state_s *)kmm_malloc(sizeof(struct usbhost_state_s)); uinfo("Allocated: %p\n", priv); return priv; } #endif /**************************************************************************** * Name: usbhost_freeclass * * Description: * Free a class instance previously allocated by usbhost_allocclass(). * * Input Parameters: * usbclass - A reference to the class instance to be freed. * * Returned Value: * None * ****************************************************************************/ #if CONFIG_USBHOST_NPREALLOC > 0 static inline void usbhost_freeclass(FAR struct usbhost_state_s *usbclass) { FAR struct usbhost_freestate_s *entry = (FAR struct usbhost_freestate_s *)usbclass; irqstate_t flags; DEBUGASSERT(entry != NULL); uinfo("Freeing: %p\n", entry); /* Just put the pre-allocated class structure back on the freelist */ flags = enter_critical_section(); entry->flink = g_freelist; g_freelist = entry; leave_critical_section(flags); } #else static inline void usbhost_freeclass(FAR struct usbhost_state_s *usbclass) { DEBUGASSERT(usbclass != NULL); /* Free the class instance (calling sched_kfree() in case we are executing * from an interrupt handler. */ uinfo("Freeing: %p\n", usbclass); sched_kfree(usbclass); } #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 = enter_critical_section(); for (devno = 0; devno < 26; devno++) { uint32_t bitno = 1 << devno; if ((g_devinuse & bitno) == 0) { g_devinuse |= bitno; priv->sdchar = 'a' + devno; leave_critical_section(flags); return OK; } } leave_critical_section(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 = enter_critical_section(); g_devinuse &= ~(1 << devno); leave_critical_section(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 Value: * None * ****************************************************************************/ #if defined(CONFIG_DEBUG_USB) && defined(CONFIG_DEBUG_INFO) static void usbhost_dumpcbw(FAR struct usbmsc_cbw_s *cbw) { int i; uinfo("CBW:\n"); uinfo(" signature: %08x\n", usbhost_getle32(cbw->signature)); uinfo(" tag: %08x\n", usbhost_getle32(cbw->tag)); uinfo(" datlen: %08x\n", usbhost_getle32(cbw->datlen)); uinfo(" flags: %02x\n", cbw->flags); uinfo(" lun: %02x\n", cbw->lun); uinfo(" cdblen: %02x\n", cbw->cdblen); uinfo("CDB:\n"); for (i = 0; i < cbw->cdblen; i += 8) { uinfo(" %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 usbmsc_csw_s *csw) { uinfo("CSW:\n"); uinfo(" signature: %08x\n", usbhost_getle32(csw->signature)); uinfo(" tag: %08x\n", usbhost_getle32(csw->tag)); uinfo(" residue: %08x\n", usbhost_getle32(csw->residue)); uinfo(" 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 Value: * None * ****************************************************************************/ static inline void usbhost_requestsensecbw(FAR struct usbmsc_cbw_s *cbw) { FAR struct scsicmd_requestsense_s *reqsense; /* Format the CBW */ usbhost_putle32(cbw->datlen, SCSIRESP_FIXEDSENSEDATA_SIZEOF); cbw->flags = USBMSC_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 usbmsc_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 usbmsc_cbw_s *cbw) { FAR struct scsicmd_readcapacity10_s *rcap10; /* Format the CBW */ usbhost_putle32(cbw->datlen, SCSIRESP_READCAPACITY10_SIZEOF); cbw->flags = USBMSC_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 usbmsc_cbw_s *cbw) { FAR struct scscicmd_inquiry_s *inq; /* Format the CBW */ usbhost_putle32(cbw->datlen, SCSIRESP_INQUIRY_SIZEOF); cbw->flags = USBMSC_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 usbmsc_cbw_s *cbw) { FAR struct scsicmd_read10_s *rd10; /* Format the CBW */ usbhost_putle32(cbw->datlen, blocksize * nsectors); cbw->flags = USBMSC_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 usbmsc_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 Value: * 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; FAR struct usbhost_hubport_s *hport; DEBUGASSERT(priv && priv->tbuffer); int ret; /* 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. */ uinfo("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 = USBMSC_REQ_GETMAXLUN; usbhost_putle16(req->len, 1); DEBUGASSERT(priv->usbclass.hport); hport = priv->usbclass.hport; ret = DRVR_CTRLIN(hport->drvr, hport->ep0, req, priv->tbuffer); if (ret < 0) { /* Devices that do not support multiple LUNs may stall this command. * On a failure, a single LUN is assumed. */ *(priv->tbuffer) = 0; } return OK; } static inline int usbhost_testunitready(FAR struct usbhost_state_s *priv) { FAR struct usbhost_hubport_s *hport; FAR struct usbmsc_cbw_s *cbw; ssize_t nbytes; DEBUGASSERT(priv->usbclass.hport); hport = priv->usbclass.hport; /* Initialize a CBW (re-using the allocated transfer buffer) */ cbw = usbhost_cbwalloc(priv); if (!cbw) { uerr("ERROR: Failed to create CBW\n"); return -ENOMEM; } /* Construct and send the CBW */ usbhost_testunitreadycbw(cbw); nbytes = DRVR_TRANSFER(hport->drvr, priv->bulkout, (FAR uint8_t *)cbw, USBMSC_CBW_SIZEOF); if (nbytes >= 0) { /* Receive the CSW */ nbytes = DRVR_TRANSFER(hport->drvr, priv->bulkin, priv->tbuffer, USBMSC_CSW_SIZEOF); if (nbytes >= 0) { usbhost_dumpcsw((FAR struct usbmsc_csw_s *)priv->tbuffer); } } return nbytes < 0 ? (int)nbytes : OK; } static inline int usbhost_requestsense(FAR struct usbhost_state_s *priv) { FAR struct usbhost_hubport_s *hport; FAR struct usbmsc_cbw_s *cbw; ssize_t nbytes; DEBUGASSERT(priv->usbclass.hport); hport = priv->usbclass.hport; /* Initialize a CBW (re-using the allocated transfer buffer) */ cbw = usbhost_cbwalloc(priv); if (!cbw) { uerr("ERROR: Failed to create CBW\n"); return -ENOMEM; } /* Construct and send the CBW */ usbhost_requestsensecbw(cbw); nbytes = DRVR_TRANSFER(hport->drvr, priv->bulkout, (FAR uint8_t *)cbw, USBMSC_CBW_SIZEOF); if (nbytes >= 0) { /* Receive the sense data response */ nbytes = DRVR_TRANSFER(hport->drvr, priv->bulkin, priv->tbuffer, SCSIRESP_FIXEDSENSEDATA_SIZEOF); if (nbytes >= 0) { /* Receive the CSW */ nbytes = DRVR_TRANSFER(hport->drvr, priv->bulkin, priv->tbuffer, USBMSC_CSW_SIZEOF); if (nbytes >= 0) { usbhost_dumpcsw((FAR struct usbmsc_csw_s *)priv->tbuffer); } } } return nbytes < 0 ? (int)nbytes : OK; } static inline int usbhost_readcapacity(FAR struct usbhost_state_s *priv) { FAR struct usbhost_hubport_s *hport; FAR struct usbmsc_cbw_s *cbw; FAR struct scsiresp_readcapacity10_s *resp; ssize_t nbytes; DEBUGASSERT(priv->usbclass.hport); hport = priv->usbclass.hport; /* Initialize a CBW (re-using the allocated transfer buffer) */ cbw = usbhost_cbwalloc(priv); if (!cbw) { uerr("ERROR: Failed to create CBW\n"); return -ENOMEM; } /* Construct and send the CBW */ usbhost_readcapacitycbw(cbw); nbytes = DRVR_TRANSFER(hport->drvr, priv->bulkout, (FAR uint8_t *)cbw, USBMSC_CBW_SIZEOF); if (nbytes >= 0) { /* Receive the read capacity CBW IN response */ nbytes = DRVR_TRANSFER(hport->drvr, priv->bulkin, priv->tbuffer, SCSIRESP_READCAPACITY10_SIZEOF); if (nbytes >= 0) { /* Save the capacity information */ resp = (FAR struct scsiresp_readcapacity10_s *)priv->tbuffer; priv->nblocks = usbhost_getbe32(resp->lba) + 1; priv->blocksize = usbhost_getbe32(resp->blklen); /* Receive the CSW */ nbytes = DRVR_TRANSFER(hport->drvr, priv->bulkin, priv->tbuffer, USBMSC_CSW_SIZEOF); if (nbytes >= 0) { usbhost_dumpcsw((FAR struct usbmsc_csw_s *)priv->tbuffer); } } } return nbytes < 0 ? (int)nbytes : OK; } static inline int usbhost_inquiry(FAR struct usbhost_state_s *priv) { FAR struct usbhost_hubport_s *hport; FAR struct usbmsc_cbw_s *cbw; ssize_t nbytes; DEBUGASSERT(priv->usbclass.hport); hport = priv->usbclass.hport; /* Initialize a CBW (re-using the allocated transfer buffer) */ cbw = usbhost_cbwalloc(priv); if (!cbw) { uerr("ERROR: Failed to create CBW\n"); return -ENOMEM; } /* Construct and send the CBW */ usbhost_inquirycbw(cbw); nbytes = DRVR_TRANSFER(hport->drvr, priv->bulkout, (FAR uint8_t *)cbw, USBMSC_CBW_SIZEOF); if (nbytes >= 0) { /* Receive the CBW IN response */ nbytes = DRVR_TRANSFER(hport->drvr, priv->bulkin, priv->tbuffer, SCSIRESP_INQUIRY_SIZEOF); if (nbytes >= 0) { #if 0 FAR struct scsiresp_inquiry_s *resp; /* TODO: If USB debug is enabled, dump the response data here */ resp = (FAR struct scsiresp_inquiry_s *)priv->tbuffer; #endif /* Receive the CSW */ nbytes = DRVR_TRANSFER(hport->drvr, priv->bulkin, priv->tbuffer, USBMSC_CSW_SIZEOF); if (nbytes >= 0) { usbhost_dumpcsw((FAR struct usbmsc_csw_s *)priv->tbuffer); } } } return nbytes < 0 ? (int)nbytes : OK; } /**************************************************************************** * Name: usbhost_destroy * * Description: * The USB mass storage device has been disconnected and the reference 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 Value: * None * ****************************************************************************/ static void usbhost_destroy(FAR void *arg) { FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)arg; FAR struct usbhost_hubport_s *hport; char devname[DEV_NAMELEN]; DEBUGASSERT(priv != NULL && priv->usbclass.hport != NULL); hport = priv->usbclass.hport; uinfo("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(hport->drvr, priv->bulkout); } if (priv->bulkin) { DRVR_EPFREE(hport->drvr, priv->bulkin); } /* Free any transfer buffers */ usbhost_tfree(priv); /* Destroy the semaphores */ nxsem_destroy(&priv->exclsem); /* Disconnect the USB host device */ DRVR_DISCONNECT(hport->drvr, hport); /* Free the function address assigned to this device */ usbhost_devaddr_destroy(hport, hport->funcaddr); hport->funcaddr = 0; /* And free the class instance. */ 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 * descriptor. * desclen - The length in bytes of the configuration descriptor. * * Returned Value: * 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) { FAR struct usbhost_hubport_s *hport; 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 && priv->usbclass.hport && configdesc != NULL && desclen >= sizeof(struct usb_cfgdesc_s)); hport = priv->usbclass.hport; /* Keep the compiler from complaining about uninitialized variables */ memset(&bindesc, 0, sizeof(struct usbhost_epdesc_s)); memset(&boutdesc, 0, sizeof(struct usbhost_epdesc_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; uinfo("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; uinfo("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.hport = hport; boutdesc.addr = epdesc->addr & USB_EP_ADDR_NUMBER_MASK; boutdesc.in = false; boutdesc.xfrtype = USB_EP_ATTR_XFER_BULK; boutdesc.interval = epdesc->interval; boutdesc.mxpacketsize = usbhost_getle16(epdesc->mxpacketsize); uinfo("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.hport = hport; bindesc.addr = epdesc->addr & USB_EP_ADDR_NUMBER_MASK; bindesc.in = 1; bindesc.xfrtype = USB_EP_ATTR_XFER_BULK; bindesc.interval = epdesc->interval; bindesc.mxpacketsize = usbhost_getle16(epdesc->mxpacketsize); uinfo("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) { uerr("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(hport->drvr, &boutdesc, &priv->bulkout); if (ret < 0) { uerr("ERROR: Failed to allocate Bulk OUT endpoint\n"); return ret; } ret = DRVR_EPALLOC(hport->drvr, &bindesc, &priv->bulkin); if (ret < 0) { uerr("ERROR: Failed to allocate Bulk IN endpoint\n"); (void)DRVR_EPFREE(hport->drvr, priv->bulkout); return ret; } uinfo("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 Value: * None * ****************************************************************************/ static inline int usbhost_initvolume(FAR struct usbhost_state_s *priv) { FAR struct usbmsc_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 < 0) { uerr("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 */ uinfo("Get max LUN\n"); ret = usbhost_maxlunreq(priv); for (retries = 0; retries < USBHOST_MAX_RETRIES /* && ret >= 0 */; retries++) { uinfo("Test unit ready, retries=%d\n", retries); /* Wait just a bit */ nxsig_usleep(USBHOST_RETRY_USEC); /* Send TESTUNITREADY to see if the unit is ready. The most likely error * error that can occur here is a a stall which simply means that the * the device is not yet able to respond. */ ret = usbhost_testunitready(priv); if (ret >= 0) { /* Is the unit is ready */ csw = (FAR struct usbmsc_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. */ uinfo("Request sense\n"); ret = usbhost_requestsense(priv); } /* It is acceptable for a mass storage device to respond to the * Test Unit Ready and Request Sense commands with a stall if it is * unable to respond. But other failures mean that something is * wrong and a device reset is in order. The transfer functions will * return -EPERM if the transfer failed due to a stall. */ if (ret < 0 && ret != -EPERM) { uerr("ERROR: DRVR_TRANSFER returned: %d\n", ret); break; } } /* Did the unit become ready? Did an error occur? Or did we time out? */ if (retries >= USBHOST_MAX_RETRIES) { uerr("ERROR: Timeout!\n"); ret = -ETIMEDOUT; } if (ret >= 0) { /* Get the capacity of the volume */ uinfo("Read capacity\n"); ret = usbhost_readcapacity(priv); if (ret >= 0) { /* Check the CSW for errors */ csw = (FAR struct usbmsc_csw_s *)priv->tbuffer; if (csw->status != 0) { uerr("ERROR: CSW status error: %d\n", csw->status); ret = -ENODEV; } } } /* Get information about the volume */ if (ret >= 0) { /* Inquiry */ uinfo("Inquiry\n"); ret = usbhost_inquiry(priv); if (ret >= 0) { /* Check the CSW for errors */ csw = (FAR struct usbmsc_csw_s *)priv->tbuffer; if (csw->status != 0) { uerr("ERROR: CSW status error: %d\n", csw->status); ret = -ENODEV; } } } /* Register the block driver */ if (ret >= 0) { char devname[DEV_NAMELEN]; uinfo("Register block driver\n"); usbhost_mkdevname(priv, devname); ret = register_blockdriver(devname, &g_bops, 0, priv); } /* Decrement the reference count. We incremented the reference count * above so that usbhost_destroy() could not be called. We now have to * be concerned about asynchronous modification of crefs because the block * driver has been registerd. */ usbhost_takesem(&priv->exclsem); DEBUGASSERT(priv->crefs >= 2); /* Decrement the reference count */ priv->crefs--; /* Check if we successfully initialized. If so, 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 (ret >= 0 && 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 destroyed 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 Value: * 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 Value: * 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 Value: * 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 Value: * 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 Value: * 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 Value: * 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 Value: * 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 Value: * 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 Value: * 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) { FAR struct usbhost_hubport_s *hport; DEBUGASSERT(priv != NULL && priv->usbclass.hport != NULL && priv->tbuffer == NULL); hport = priv->usbclass.hport; return DRVR_ALLOC(hport->drvr, &priv->tbuffer, &priv->tbuflen); } /**************************************************************************** * Name: usbhost_tfree * * Description: * Free transfer buffer memory. * * Input Parameters: * priv - A reference to the class instance. * * Returned Value: * 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) { FAR struct usbhost_hubport_s *hport; int result = OK; DEBUGASSERT(priv != NULL && priv->usbclass.hport != NULL); if (priv->tbuffer) { hport = priv->usbclass.hport; result = DRVR_FREE(hport->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 Value: * None * ****************************************************************************/ static FAR struct usbmsc_cbw_s *usbhost_cbwalloc(FAR struct usbhost_state_s *priv) { FAR struct usbmsc_cbw_s *cbw = NULL; DEBUGASSERT(priv->tbuffer && priv->tbuflen >= sizeof(struct usbmsc_cbw_s)); /* Initialize the CBW sructure */ cbw = (FAR struct usbmsc_cbw_s *)priv->tbuffer; memset(cbw, 0, sizeof(struct usbmsc_cbw_s)); usbhost_putle32(cbw->signature, USBMSC_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: * hport - The hub port that manages the new class instance. * id - In the case where the device supports multiple base classes, * subclasses, or protocols, this specifies which to configure for. * * Returned Value: * 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 hport 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_hubport_s *hport, 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->usbclass.hport = hport; priv->usbclass.connect = usbhost_connect; priv->usbclass.disconnected = usbhost_disconnected; /* The initial reference count is 1... One reference is held by the driver */ priv->crefs = 1; /* Initialize semaphores (this works okay in the interrupt context) */ nxsem_init(&priv->exclsem, 0, 1); /* 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->usbclass; } } /* 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: * usbclass - The USB host class entry previously obtained from a call to * create(). * configdesc - A pointer to a uint8_t buffer container the configuration * descriptor. * desclen - The length in bytes of the configuration descriptor. * * Returned Value: * 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 *usbclass, FAR const uint8_t *configdesc, int desclen) { FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)usbclass; 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); if (ret < 0) { uerr("ERROR: usbhost_cfgdesc() failed: %d\n", ret); } else { /* Now configure the LUNs and register the block driver(s) */ ret = usbhost_initvolume(priv); if (ret < 0) { uerr("ERROR: 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: * usbclass - The USB host class entry previously obtained from a call to * create(). * * Returned Value: * 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 *usbclass) { FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)usbclass; 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 = enter_critical_section(); 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. */ uinfo("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. */ uinfo("Queuing destruction: worker %p->%p\n", priv->work.worker, usbhost_destroy); DEBUGASSERT(priv->work.worker == NULL); (void)work_queue(HPWORK, &priv->work, usbhost_destroy, priv, 0); } else { /* Do the work now */ usbhost_destroy(priv); } } leave_critical_section(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; uinfo("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 = enter_critical_section(); 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; } leave_critical_section(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; uinfo("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 = enter_critical_section(); /* 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); } leave_critical_section(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; FAR struct usbhost_hubport_s *hport; ssize_t nbytes = 0; DEBUGASSERT(inode && inode->i_private); priv = (FAR struct usbhost_state_s *)inode->i_private; DEBUGASSERT(priv->usbclass.hport); hport = priv->usbclass.hport; uinfo("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. */ nbytes = -ENODEV; } else if (nsectors > 0) { FAR struct usbmsc_cbw_s *cbw; usbhost_takesem(&priv->exclsem); /* Assume allocation failure */ nbytes = -ENOMEM; /* Initialize a CBW (re-using the allocated transfer buffer) */ cbw = usbhost_cbwalloc(priv); if (cbw) { /* Loop in the event that EAGAIN is returned (mean that the * transaction was NAKed and we should try again. */ do { /* Assume some device failure */ nbytes = -ENODEV; /* Construct and send the CBW */ usbhost_readcbw(startsector, priv->blocksize, nsectors, cbw); nbytes = DRVR_TRANSFER(hport->drvr, priv->bulkout, (FAR uint8_t *)cbw, USBMSC_CBW_SIZEOF); if (nbytes >= 0) { /* Receive the user data */ nbytes = DRVR_TRANSFER(hport->drvr, priv->bulkin, buffer, priv->blocksize * nsectors); if (nbytes >= 0) { /* Receive the CSW */ nbytes = DRVR_TRANSFER(hport->drvr, priv->bulkin, priv->tbuffer, USBMSC_CSW_SIZEOF); if (nbytes >= 0) { FAR struct usbmsc_csw_s *csw; /* Check the CSW status */ csw = (FAR struct usbmsc_csw_s *)priv->tbuffer; if (csw->status != 0) { uerr("ERROR: CSW status error: %d\n", csw->status); nbytes = -ENODEV; } } } } } while (nbytes == -EAGAIN); } usbhost_givesem(&priv->exclsem); } /* On success, return the number of blocks read */ return nbytes < 0 ? (int)nbytes : nsectors; } /**************************************************************************** * 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; FAR struct usbhost_hubport_s *hport; ssize_t nbytes; uinfo("sector: %d nsectors: %d sectorsize: %d\n"); DEBUGASSERT(inode && inode->i_private); priv = (FAR struct usbhost_state_s *)inode->i_private; DEBUGASSERT(priv->usbclass.hport); hport = priv->usbclass.hport; /* 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. */ nbytes = -ENODEV; } else { FAR struct usbmsc_cbw_s *cbw; usbhost_takesem(&priv->exclsem); /* Assume allocation failure */ nbytes = -ENOMEM; /* Initialize a CBW (re-using the allocated transfer buffer) */ cbw = usbhost_cbwalloc(priv); if (cbw) { /* Assume some device failure */ nbytes = -ENODEV; /* Construct and send the CBW */ usbhost_writecbw(startsector, priv->blocksize, nsectors, cbw); nbytes = DRVR_TRANSFER(hport->drvr, priv->bulkout, (FAR uint8_t *)cbw, USBMSC_CBW_SIZEOF); if (nbytes >= 0) { /* Send the user data */ nbytes = DRVR_TRANSFER(hport->drvr, priv->bulkout, (FAR uint8_t *)buffer, priv->blocksize * nsectors); if (nbytes >= 0) { /* Receive the CSW */ nbytes = DRVR_TRANSFER(hport->drvr, priv->bulkin, priv->tbuffer, USBMSC_CSW_SIZEOF); if (nbytes >= 0) { FAR struct usbmsc_csw_s *csw; /* Check the CSW status */ csw = (FAR struct usbmsc_csw_s *)priv->tbuffer; if (csw->status != 0) { uerr("ERROR: CSW status error: %d\n", csw->status); nbytes = -ENODEV; } } } } } usbhost_givesem(&priv->exclsem); } /* On success, return the number of blocks written */ return nbytes < 0 ? (int)nbytes : nsectors; } #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; uinfo("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); uinfo("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; uinfo("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_msc_initialize * * 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 Value: * On success this function will return zero (OK); A negated errno value * will be returned on failure. * ****************************************************************************/ int usbhost_msc_initialize(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 FAR struct usbhost_freestate_s *entry; int i; g_freelist = NULL; for (i = 0; i < CONFIG_USBHOST_NPREALLOC; i++) { entry = (FAR struct usbhost_freestate_s *)&g_prealloc[i]; entry->flink = g_freelist; g_freelist = entry; } #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 */