diff options
Diffstat (limited to 'nuttx/drivers/usbhost/usbhost_storage.c')
| -rw-r--r-- | nuttx/drivers/usbhost/usbhost_storage.c | 2233 |
1 files changed, 2233 insertions, 0 deletions
diff --git a/nuttx/drivers/usbhost/usbhost_storage.c b/nuttx/drivers/usbhost/usbhost_storage.c new file mode 100644 index 000000000..2817c2446 --- /dev/null +++ b/nuttx/drivers/usbhost/usbhost_storage.c @@ -0,0 +1,2233 @@ +/**************************************************************************** + * 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/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 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, + 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 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_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 */ + 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 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 usbmsc_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 usbmsc_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 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 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); + 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. + */ + + 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 = USBMSC_REQ_GETMAXLUN; + usbhost_putle16(req->len, 1); + + ret = DRVR_CTRLIN(priv->drvr, req, priv->tbuffer); + if (ret != OK) + { + /* 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 usbmsc_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, USBMSC_CBW_SIZEOF); + if (result == OK) + { + /* Receive the CSW */ + + result = DRVR_TRANSFER(priv->drvr, priv->bulkin, + priv->tbuffer, USBMSC_CSW_SIZEOF); + if (result == OK) + { + usbhost_dumpcsw((FAR struct usbmsc_csw_s *)priv->tbuffer); + } + } + return result; +} + +static inline int usbhost_requestsense(FAR struct usbhost_state_s *priv) +{ + FAR struct usbmsc_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, USBMSC_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, USBMSC_CSW_SIZEOF); + if (result == OK) + { + usbhost_dumpcsw((FAR struct usbmsc_csw_s *)priv->tbuffer); + } + } + } + + return result; +} + +static inline int usbhost_readcapacity(FAR struct usbhost_state_s *priv) +{ + FAR struct usbmsc_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, USBMSC_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) + 1; + priv->blocksize = usbhost_getbe32(resp->blklen); + + /* Receive the CSW */ + + result = DRVR_TRANSFER(priv->drvr, priv->bulkin, + priv->tbuffer, USBMSC_CSW_SIZEOF); + if (result == OK) + { + usbhost_dumpcsw((FAR struct usbmsc_csw_s *)priv->tbuffer); + } + } + } + + return result; +} + +static inline int usbhost_inquiry(FAR struct usbhost_state_s *priv) +{ + FAR struct usbmsc_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, USBMSC_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, USBMSC_CSW_SIZEOF); + if (result == OK) + { + usbhost_dumpcsw((FAR struct usbmsc_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 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 != 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 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. + */ + + 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 usbmsc_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 usbmsc_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 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)) + + /* Intialize 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: + * 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 usbmsc_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, USBMSC_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, USBMSC_CSW_SIZEOF); + if (result == OK) + { + FAR struct usbmsc_csw_s *csw; + + /* Check the CSW status */ + + csw = (FAR struct usbmsc_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 usbmsc_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, USBMSC_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, USBMSC_CSW_SIZEOF); + if (result == OK) + { + FAR struct usbmsc_csw_s *csw; + + /* Check the CSW status */ + + csw = (FAR struct usbmsc_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 */ |