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libopencm3/lib/usb/usb_msc.c

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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2013 Weston Schmidt <weston_schmidt@alumni.purdue.edu>
* Copyright (C) 2013 Pavol Rusnak <stick@gk2.sk>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <libopencm3/cm3/common.h>
#include <libopencm3/usb/usbd.h>
#include <libopencm3/usb/msc.h>
#include "usb_private.h"
/* Definitions of Mass Storage Class from:
*
* (A) "Universal Serial Bus Mass Storage Class Bulk-Only Transport
* Revision 1.0"
*
* (B) "Universal Serial Bus Mass Storage Class Specification Overview
* Revision 1.0"
*/
/* Command Block Wrapper */
#define CBW_SIGNATURE 0x43425355
#define CBW_STATUS_SUCCESS 0
#define CBW_STATUS_FAILED 1
#define CBW_STATUS_PHASE_ERROR 2
/* Command Status Wrapper */
#define CSW_SIGNATURE 0x53425355
#define CSW_STATUS_SUCCESS 0
#define CSW_STATUS_FAILED 1
#define CSW_STATUS_PHASE_ERROR 2
/* Implemented SCSI Commands */
#define SCSI_TEST_UNIT_READY 0x00
#define SCSI_REQUEST_SENSE 0x03
#define SCSI_FORMAT_UNIT 0x04
#define SCSI_READ_6 0x08
#define SCSI_WRITE_6 0x0A
#define SCSI_INQUIRY 0x12
#define SCSI_MODE_SENSE_6 0x1A
#define SCSI_SEND_DIAGNOSTIC 0x1D
#define SCSI_READ_CAPACITY 0x25
#define SCSI_READ_10 0x28
/* Required SCSI Commands */
/* Optional SCSI Commands */
#define SCSI_REPORT_LUNS 0xA0
#define SCSI_PREVENT_ALLOW_MEDIUM_REMOVAL 0x1E
#define SCSI_MODE_SELECT_6 0x15
#define SCSI_MODE_SELECT_10 0x55
#define SCSI_MODE_SENSE_10 0x5A
#define SCSI_READ_12 0xA8
#define SCSI_READ_FORMAT_CAPACITIES 0x23
#define SCSI_READ_TOC_PMA_ATIP 0x43
#define SCSI_START_STOP_UNIT 0x1B
#define SCSI_SYNCHRONIZE_CACHE 0x35
#define SCSI_VERIFY 0x2F
#define SCSI_WRITE_10 0x2A
#define SCSI_WRITE_12 0xAA
/* The sense codes */
enum sbc_sense_key {
SBC_SENSE_KEY_NO_SENSE = 0x00,
SBC_SENSE_KEY_RECOVERED_ERROR = 0x01,
SBC_SENSE_KEY_NOT_READY = 0x02,
SBC_SENSE_KEY_MEDIUM_ERROR = 0x03,
SBC_SENSE_KEY_HARDWARE_ERROR = 0x04,
SBC_SENSE_KEY_ILLEGAL_REQUEST = 0x05,
SBC_SENSE_KEY_UNIT_ATTENTION = 0x06,
SBC_SENSE_KEY_DATA_PROTECT = 0x07,
SBC_SENSE_KEY_BLANK_CHECK = 0x08,
SBC_SENSE_KEY_VENDOR_SPECIFIC = 0x09,
SBC_SENSE_KEY_COPY_ABORTED = 0x0A,
SBC_SENSE_KEY_ABORTED_COMMAND = 0x0B,
SBC_SENSE_KEY_VOLUME_OVERFLOW = 0x0D,
SBC_SENSE_KEY_MISCOMPARE = 0x0E
};
enum sbc_asc {
SBC_ASC_NO_ADDITIONAL_SENSE_INFORMATION = 0x00,
SBC_ASC_PERIPHERAL_DEVICE_WRITE_FAULT = 0x03,
SBC_ASC_LOGICAL_UNIT_NOT_READY = 0x04,
SBC_ASC_UNRECOVERED_READ_ERROR = 0x11,
SBC_ASC_INVALID_COMMAND_OPERATION_CODE = 0x20,
SBC_ASC_LBA_OUT_OF_RANGE = 0x21,
SBC_ASC_INVALID_FIELD_IN_CDB = 0x24,
SBC_ASC_WRITE_PROTECTED = 0x27,
SBC_ASC_NOT_READY_TO_READY_CHANGE = 0x28,
SBC_ASC_FORMAT_ERROR = 0x31,
SBC_ASC_MEDIUM_NOT_PRESENT = 0x3A
};
enum sbc_ascq {
SBC_ASCQ_NA = 0x00,
SBC_ASCQ_FORMAT_COMMAND_FAILED = 0x01,
SBC_ASCQ_INITIALIZING_COMMAND_REQUIRED = 0x02,
SBC_ASCQ_OPERATION_IN_PROGRESS = 0x07
};
enum trans_event {
EVENT_CBW_VALID,
EVENT_NEED_STATUS
};
struct usb_msc_cbw {
uint32_t dCBWSignature;
uint32_t dCBWTag;
uint32_t dCBWDataTransferLength;
uint8_t bmCBWFlags;
uint8_t bCBWLUN;
uint8_t bCBWCBLength;
uint8_t CBWCB[16];
} __attribute__((packed));
struct usb_msc_csw {
uint32_t dCSWSignature;
uint32_t dCSWTag;
uint32_t dCSWDataResidue;
uint8_t bCSWStatus;
} __attribute__((packed));
struct sbc_sense_info {
uint8_t key;
uint8_t asc;
uint8_t ascq;
};
struct usb_msc_trans {
uint8_t cbw_cnt; /* Read until 31 bytes */
union {
struct usb_msc_cbw cbw;
uint8_t buf[1];
} cbw;
uint32_t bytes_to_read;
uint32_t bytes_to_write;
uint32_t byte_count; /* Either read until equal to
bytes_to_read or write until equal
to bytes_to_write. */
uint32_t lba_start;
uint32_t block_count;
uint32_t current_block;
uint8_t msd_buf[512];
bool csw_valid;
uint8_t csw_sent; /* Write until 13 bytes */
union {
struct usb_msc_csw csw;
uint8_t buf[1];
} csw;
};
struct _usbd_mass_storage {
usbd_device *usbd_dev;
uint8_t ep_in;
uint8_t ep_in_size;
uint8_t ep_out;
uint8_t ep_out_size;
const char *vendor_id;
const char *product_id;
const char *product_revision_level;
uint32_t block_count;
int (*read_block)(uint32_t lba, uint8_t *copy_to);
int (*write_block)(uint32_t lba, const uint8_t *copy_from);
void (*lock)(void);
void (*unlock)(void);
struct usb_msc_trans trans;
struct sbc_sense_info sense;
};
static usbd_mass_storage _mass_storage;
/*-- SCSI Base Responses -----------------------------------------------------*/
static const uint8_t _spc3_inquiry_response[36] = {
0x00, /* Byte 0: Peripheral Qualifier = 0, Peripheral Device Type = 0 */
0x80, /* Byte 1: RMB = 1, Reserved = 0 */
0x04, /* Byte 2: Version = 0 */
0x02, /* Byte 3: Obsolete = 0, NormACA = 0, HiSup = 0, Response Data Format = 2 */
0x20, /* Byte 4: Additional Length (n-4) = 31 + 4 */
0x00, /* Byte 5: SCCS = 0, ACC = 0, TPGS = 0, 3PC = 0, Reserved = 0, Protect = 0 */
0x00, /* Byte 6: BQue = 0, EncServ = 0, VS = 0, MultiP = 0, MChngr = 0, Obsolete = 0, Addr16 = 0 */
0x00, /* Byte 7: Obsolete = 0, Wbus16 = 0, Sync = 0, Linked = 0, CmdQue = 0, VS = 0 */
/* Byte 8 - Byte 15: Vendor Identification */
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
/* Byte 16 - Byte 31: Product Identification */
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
/* Byte 32 - Byte 35: Product Revision Level */
0x20, 0x20, 0x20, 0x20
};
static const uint8_t _spc3_request_sense[18] = {
0x70, /* Byte 0: VALID = 0, Response Code = 112 */
0x00, /* Byte 1: Obsolete = 0 */
0x00, /* Byte 2: Filemark = 0, EOM = 0, ILI = 0, Reserved = 0, Sense Key = 0 */
/* Byte 3 - Byte 6: Information = 0 */
0, 0, 0, 0,
0x0a, /* Byte 7: Additional Sense Length = 10 */
/* Byte 8 - Byte 11: Command Specific Info = 0 */
0, 0, 0, 0,
0x00, /* Byte 12: Additional Sense Code (ASC) = 0 */
0x00, /* Byte 13: Additional Sense Code Qualifier (ASCQ) = 0 */
0x00, /* Byte 14: Field Replaceable Unit Code (FRUC) = 0 */
0x00, /* Byte 15: SKSV = 0, SenseKeySpecific[0] = 0 */
0x00, /* Byte 16: SenseKeySpecific[0] = 0 */
0x00 /* Byte 17: SenseKeySpecific[0] = 0 */
};
/*-- SCSI Layer --------------------------------------------------------------*/
static void set_sbc_status(usbd_mass_storage *ms,
enum sbc_sense_key key,
enum sbc_asc asc,
enum sbc_ascq ascq)
{
ms->sense.key = (uint8_t) key;
ms->sense.asc = (uint8_t) asc;
ms->sense.ascq = (uint8_t) ascq;
}
static void set_sbc_status_good(usbd_mass_storage *ms)
{
set_sbc_status(ms,
SBC_SENSE_KEY_NO_SENSE,
SBC_ASC_NO_ADDITIONAL_SENSE_INFORMATION,
SBC_ASCQ_NA);
}
static uint8_t *get_cbw_buf(struct usb_msc_trans *trans)
{
return &trans->cbw.cbw.CBWCB[0];
}
static void scsi_read_6(usbd_mass_storage *ms,
struct usb_msc_trans *trans,
enum trans_event event)
{
if (EVENT_CBW_VALID == event) {
uint8_t *buf;
buf = get_cbw_buf(trans);
trans->lba_start = (buf[2] << 8) | buf[3];
trans->block_count = buf[4];
trans->current_block = 0;
/* TODO: Check the lba & block_count for range. */
/* both are in terms of 512 byte blocks, so shift by 9 */
trans->bytes_to_write = trans->block_count << 9;
set_sbc_status_good(ms);
}
}
static void scsi_write_6(usbd_mass_storage *ms,
struct usb_msc_trans *trans,
enum trans_event event)
{
(void) ms;
if (EVENT_CBW_VALID == event) {
uint8_t *buf;
buf = get_cbw_buf(trans);
trans->lba_start = ((0x1f & buf[1]) << 16)
| (buf[2] << 8) | buf[3];
trans->block_count = buf[4];
trans->current_block = 0;
trans->bytes_to_read = trans->block_count << 9;
}
}
static void scsi_write_10(usbd_mass_storage *ms,
struct usb_msc_trans *trans,
enum trans_event event)
{
(void) ms;
if (EVENT_CBW_VALID == event) {
uint8_t *buf;
buf = get_cbw_buf(trans);
trans->lba_start = (buf[2] << 24) | (buf[3] << 16) |
(buf[4] << 8) | buf[5];
trans->block_count = (buf[7] << 8) | buf[8];
trans->current_block = 0;
trans->bytes_to_read = trans->block_count << 9;
}
}
static void scsi_read_10(usbd_mass_storage *ms,
struct usb_msc_trans *trans,
enum trans_event event)
{
if (EVENT_CBW_VALID == event) {
uint8_t *buf;
buf = get_cbw_buf(trans);
trans->lba_start = (buf[2] << 24) | (buf[3] << 16)
| (buf[4] << 8) | buf[5];
trans->block_count = (buf[7] << 8) | buf[8];
/* TODO: Check the lba & block_count for range. */
/* both are in terms of 512 byte blocks, so shift by 9 */
trans->bytes_to_write = trans->block_count << 9;
set_sbc_status_good(ms);
}
}
static void scsi_read_capacity(usbd_mass_storage *ms,
struct usb_msc_trans *trans,
enum trans_event event)
{
if (EVENT_CBW_VALID == event) {
trans->msd_buf[0] = ms->block_count >> 24;
trans->msd_buf[1] = 0xff & (ms->block_count >> 16);
trans->msd_buf[2] = 0xff & (ms->block_count >> 8);
trans->msd_buf[3] = 0xff & ms->block_count;
/* Block size: 512 */
trans->msd_buf[4] = 0;
trans->msd_buf[5] = 0;
trans->msd_buf[6] = 2;
trans->msd_buf[7] = 0;
trans->bytes_to_write = 8;
set_sbc_status_good(ms);
}
}
static void scsi_format_unit(usbd_mass_storage *ms,
struct usb_msc_trans *trans,
enum trans_event event)
{
if (EVENT_CBW_VALID == event) {
uint32_t i;
memset(trans->msd_buf, 0, 512);
for (i = 0; i < ms->block_count; i++) {
(*ms->write_block)(i, trans->msd_buf);
}
set_sbc_status_good(ms);
}
}
static void scsi_request_sense(usbd_mass_storage *ms,
struct usb_msc_trans *trans,
enum trans_event event)
{
if (EVENT_CBW_VALID == event) {
uint8_t *buf;
buf = &trans->cbw.cbw.CBWCB[0];
trans->bytes_to_write = buf[4]; /* allocation length */
memcpy(trans->msd_buf, _spc3_request_sense,
sizeof(_spc3_request_sense));
trans->msd_buf[2] = ms->sense.key;
trans->msd_buf[12] = ms->sense.asc;
trans->msd_buf[13] = ms->sense.ascq;
}
}
static void scsi_mode_sense_6(usbd_mass_storage *ms,
struct usb_msc_trans *trans,
enum trans_event event)
{
(void) ms;
if (EVENT_CBW_VALID == event) {
#if 0
uint8_t *buf;
uint8_t page_code;
uint8_t allocation_length;
buf = &trans->cbw.cbw.CBWCB[0];
page_code = buf[2];
allocation_length = buf[4];
if (0x1C == page_code) { /* Informational Exceptions */
#endif
trans->bytes_to_write = 4;
trans->msd_buf[0] = 3; /* Num bytes that follow */
trans->msd_buf[1] = 0; /* Medium Type */
trans->msd_buf[2] = 0; /* Device specific param */
trans->csw.csw.dCSWDataResidue = 4;
#if 0
} else if (0x01 == page_code) { /* Error recovery */
} else if (0x3F == page_code) { /* All */
} else {
/* Error */
trans->csw.csw.bCSWStatus = CSW_STATUS_FAILED;
set_sbc_status(ms,
SBC_SENSE_KEY_ILLEGAL_REQUEST,
SBC_ASC_INVALID_FIELD_IN_CDB,
SBC_ASCQ_NA);
}
#endif
}
}
static void scsi_inquiry(usbd_mass_storage *ms,
struct usb_msc_trans *trans,
enum trans_event event)
{
if (EVENT_CBW_VALID == event) {
uint8_t evpd;
uint8_t *buf;
buf = get_cbw_buf(trans);
evpd = 1 & buf[1];
if (0 == evpd) {
size_t len;
trans->bytes_to_write = sizeof(_spc3_inquiry_response);
memcpy(trans->msd_buf, _spc3_inquiry_response,
sizeof(_spc3_inquiry_response));
len = strlen(ms->vendor_id);
len = MIN(len, 8);
memcpy(&trans->msd_buf[8], ms->vendor_id, len);
len = strlen(ms->product_id);
len = MIN(len, 16);
memcpy(&trans->msd_buf[16], ms->product_id, len);
len = strlen(ms->product_revision_level);
len = MIN(len, 4);
memcpy(&trans->msd_buf[32], ms->product_revision_level,
len);
trans->csw.csw.dCSWDataResidue =
sizeof(_spc3_inquiry_response);
set_sbc_status_good(ms);
} else {
/* TODO: Add VPD 0x83 support */
/* TODO: Add VPD 0x00 support */
}
}
}
static void scsi_command(usbd_mass_storage *ms,
struct usb_msc_trans *trans,
enum trans_event event)
{
if (EVENT_CBW_VALID == event) {
/* Setup the default success */
trans->csw_sent = 0;
trans->csw.csw.dCSWSignature = CSW_SIGNATURE;
trans->csw.csw.dCSWTag = trans->cbw.cbw.dCBWTag;
trans->csw.csw.dCSWDataResidue = 0;
trans->csw.csw.bCSWStatus = CSW_STATUS_SUCCESS;
trans->bytes_to_write = 0;
trans->bytes_to_read = 0;
trans->byte_count = 0;
}
switch (trans->cbw.cbw.CBWCB[0]) {
case SCSI_TEST_UNIT_READY:
case SCSI_SEND_DIAGNOSTIC:
/* Do nothing, just send the success. */
set_sbc_status_good(ms);
break;
case SCSI_FORMAT_UNIT:
scsi_format_unit(ms, trans, event);
break;
case SCSI_REQUEST_SENSE:
scsi_request_sense(ms, trans, event);
break;
case SCSI_MODE_SENSE_6:
scsi_mode_sense_6(ms, trans, event);
break;
case SCSI_READ_6:
scsi_read_6(ms, trans, event);
break;
case SCSI_INQUIRY:
scsi_inquiry(ms, trans, event);
break;
case SCSI_READ_CAPACITY:
scsi_read_capacity(ms, trans, event);
break;
case SCSI_READ_10:
scsi_read_10(ms, trans, event);
break;
case SCSI_WRITE_6:
scsi_write_6(ms, trans, event);
break;
case SCSI_WRITE_10:
scsi_write_10(ms, trans, event);
break;
default:
set_sbc_status(ms, SBC_SENSE_KEY_ILLEGAL_REQUEST,
SBC_ASC_INVALID_COMMAND_OPERATION_CODE,
SBC_ASCQ_NA);
trans->bytes_to_write = 0;
trans->bytes_to_read = 0;
trans->csw.csw.bCSWStatus = CSW_STATUS_FAILED;
break;
}
}
/*-- USB Mass Storage Layer --------------------------------------------------*/
/** @brief Handle the USB 'OUT' requests. */
static void msc_data_rx_cb(usbd_device *usbd_dev, uint8_t ep)
{
usbd_mass_storage *ms;
struct usb_msc_trans *trans;
int len, max_len, left;
void *p;
ms = &_mass_storage;
trans = &ms->trans;
/* RX only */
left = sizeof(struct usb_msc_cbw) - trans->cbw_cnt;
if (0 < left) {
max_len = MIN(ms->ep_out_size, left);
p = &trans->cbw.buf[0x1ff & trans->cbw_cnt];
len = usbd_ep_read_packet(usbd_dev, ep, p, max_len);
trans->cbw_cnt += len;
if (sizeof(struct usb_msc_cbw) == trans->cbw_cnt) {
scsi_command(ms, trans, EVENT_CBW_VALID);
if (trans->byte_count < trans->bytes_to_read) {
/* We must wait until there is something to
* read again. */
return;
}
}
}
if (trans->byte_count < trans->bytes_to_read) {
if (0 < trans->block_count) {
if ((0 == trans->byte_count) && (NULL != ms->lock)) {
(*ms->lock)();
}
}
left = trans->bytes_to_read - trans->byte_count;
max_len = MIN(ms->ep_out_size, left);
p = &trans->msd_buf[0x1ff & trans->byte_count];
len = usbd_ep_read_packet(usbd_dev, ep, p, max_len);
trans->byte_count += len;
if (0 < trans->block_count) {
if (0 == (0x1ff & trans->byte_count)) {
uint32_t lba;
lba = trans->lba_start + trans->current_block;
if (0 != (*ms->write_block)(lba,
trans->msd_buf)) {
/* Error */
}
trans->current_block++;
}
}
/* Fix "writes aren't acknowledged" bug on Linux (PR #409) */
if (false == trans->csw_valid) {
scsi_command(ms, trans, EVENT_NEED_STATUS);
trans->csw_valid = true;
}
left = sizeof(struct usb_msc_csw) - trans->csw_sent;
if (0 < left) {
max_len = MIN(ms->ep_out_size, left);
p = &trans->csw.buf[trans->csw_sent];
len = usbd_ep_write_packet(usbd_dev, ms->ep_in, p,
max_len);
trans->csw_sent += len;
}
} else if (trans->byte_count < trans->bytes_to_write) {
if (0 < trans->block_count) {
if ((0 == trans->byte_count) && (NULL != ms->lock)) {
(*ms->lock)();
}
if (0 == (0x1ff & trans->byte_count)) {
uint32_t lba;
lba = trans->lba_start + trans->current_block;
if (0 != (*ms->read_block)(lba,
trans->msd_buf)) {
/* Error */
}
trans->current_block++;
}
}
left = trans->bytes_to_write - trans->byte_count;
max_len = MIN(ms->ep_out_size, left);
p = &trans->msd_buf[0x1ff & trans->byte_count];
len = usbd_ep_write_packet(usbd_dev, ms->ep_in, p, max_len);
trans->byte_count += len;
} else {
if (0 < trans->block_count) {
if (trans->current_block == trans->block_count) {
uint32_t lba;
lba = trans->lba_start + trans->current_block;
if (0 != (*ms->write_block)(lba,
trans->msd_buf)) {
/* Error */
}
trans->current_block = 0;
if (NULL != ms->unlock) {
(*ms->unlock)();
}
}
}
if (false == trans->csw_valid) {
scsi_command(ms, trans, EVENT_NEED_STATUS);
trans->csw_valid = true;
}
left = sizeof(struct usb_msc_csw) - trans->csw_sent;
if (0 < left) {
max_len = MIN(ms->ep_out_size, left);
p = &trans->csw.buf[trans->csw_sent];
len = usbd_ep_write_packet(usbd_dev, ms->ep_in, p,
max_len);
trans->csw_sent += len;
}
}
}
/** @brief Handle the USB 'IN' requests. */
static void msc_data_tx_cb(usbd_device *usbd_dev, uint8_t ep)
{
usbd_mass_storage *ms;
struct usb_msc_trans *trans;
int len, max_len, left;
void *p;
ms = &_mass_storage;
trans = &ms->trans;
if (trans->byte_count < trans->bytes_to_write) {
if (0 < trans->block_count) {
if (0 == (0x1ff & trans->byte_count)) {
uint32_t lba;
lba = trans->lba_start + trans->current_block;
if (0 != (*ms->read_block)(lba,
trans->msd_buf)) {
/* Error */
}
trans->current_block++;
}
}
left = trans->bytes_to_write - trans->byte_count;
max_len = MIN(ms->ep_out_size, left);
p = &trans->msd_buf[0x1ff & trans->byte_count];
len = usbd_ep_write_packet(usbd_dev, ep, p, max_len);
trans->byte_count += len;
} else {
if (0 < trans->block_count) {
if (trans->current_block == trans->block_count) {
trans->current_block = 0;
if (NULL != ms->unlock) {
(*ms->unlock)();
}
}
}
if (false == trans->csw_valid) {
scsi_command(ms, trans, EVENT_NEED_STATUS);
trans->csw_valid = true;
}
left = sizeof(struct usb_msc_csw) - trans->csw_sent;
if (0 < left) {
max_len = MIN(ms->ep_out_size, left);
p = &trans->csw.buf[trans->csw_sent];
len = usbd_ep_write_packet(usbd_dev, ep, p, max_len);
trans->csw_sent += len;
} else if (sizeof(struct usb_msc_csw) == trans->csw_sent) {
/* End of transaction */
trans->lba_start = 0xffffffff;
trans->block_count = 0;
trans->current_block = 0;
trans->cbw_cnt = 0;
trans->bytes_to_read = 0;
trans->bytes_to_write = 0;
trans->byte_count = 0;
trans->csw_sent = 0;
trans->csw_valid = false;
}
}
}
/** @brief Handle various control requests related to the msc storage
* interface.
*/
static enum usbd_request_return_codes
msc_control_request(usbd_device *usbd_dev,
struct usb_setup_data *req, uint8_t **buf, uint16_t *len,
usbd_control_complete_callback *complete)
{
(void)complete;
(void)usbd_dev;
switch (req->bRequest) {
case USB_MSC_REQ_BULK_ONLY_RESET:
/* Do any special reset code here. */
return USBD_REQ_HANDLED;
case USB_MSC_REQ_GET_MAX_LUN:
/* Return the number of LUNs. We use 0. */
*buf[0] = 0;
*len = 1;
return USBD_REQ_HANDLED;
}
return USBD_REQ_NOTSUPP;
}
/** @brief Setup the endpoints to be bulk & register the callbacks. */
static void msc_set_config(usbd_device *usbd_dev, uint16_t wValue)
{
usbd_mass_storage *ms = &_mass_storage;
(void)wValue;
usbd_ep_setup(usbd_dev, ms->ep_in, USB_ENDPOINT_ATTR_BULK,
ms->ep_in_size, msc_data_tx_cb);
usbd_ep_setup(usbd_dev, ms->ep_out, USB_ENDPOINT_ATTR_BULK,
ms->ep_out_size, msc_data_rx_cb);
usbd_register_control_callback(
usbd_dev,
USB_REQ_TYPE_CLASS | USB_REQ_TYPE_INTERFACE,
USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT,
msc_control_request);
}
/** @addtogroup usb_msc */
/** @{ */
/** @brief Initializes the USB Mass Storage subsystem.
@note Currently you can only have this profile active.
@param[in] usbd_dev The USB device to associate the Mass Storage with.
@param[in] ep_in The USB 'IN' endpoint.
@param[in] ep_in_size The maximum endpoint size. Valid values: 8, 16, 32 or 64
@param[in] ep_out The USB 'OUT' endpoint.
@param[in] ep_out_size The maximum endpoint size. Valid values: 8, 16, 32 or 64
@param[in] vendor_id The SCSI vendor ID to return. Maximum used length is 8.
@param[in] product_id The SCSI product ID to return. Maximum used length is 16.
@param[in] product_revision_level The SCSI product revision level to return.
Maximum used length is 4.
@param[in] block_count The number of 512-byte blocks available.
@param[in] read_block The function called when the host requests to read a LBA
block. Must _NOT_ be NULL.
@param[in] write_block The function called when the host requests to write a
LBA block. Must _NOT_ be NULL.
@return Pointer to the usbd_mass_storage struct.
*/
usbd_mass_storage *usb_msc_init(usbd_device *usbd_dev,
uint8_t ep_in, uint8_t ep_in_size,
uint8_t ep_out, uint8_t ep_out_size,
const char *vendor_id,
const char *product_id,
const char *product_revision_level,
const uint32_t block_count,
int (*read_block)(uint32_t lba,
uint8_t *copy_to),
int (*write_block)(uint32_t lba,
const uint8_t *copy_from))
{
_mass_storage.usbd_dev = usbd_dev;
_mass_storage.ep_in = ep_in;
_mass_storage.ep_in_size = ep_in_size;
_mass_storage.ep_out = ep_out;
_mass_storage.ep_out_size = ep_out_size;
_mass_storage.vendor_id = vendor_id;
_mass_storage.product_id = product_id;
_mass_storage.product_revision_level = product_revision_level;
_mass_storage.block_count = block_count - 1;
_mass_storage.read_block = read_block;
_mass_storage.write_block = write_block;
_mass_storage.lock = NULL;
_mass_storage.unlock = NULL;
_mass_storage.trans.lba_start = 0xffffffff;
_mass_storage.trans.block_count = 0;
_mass_storage.trans.current_block = 0;
_mass_storage.trans.cbw_cnt = 0;
_mass_storage.trans.bytes_to_read = 0;
_mass_storage.trans.bytes_to_write = 0;
_mass_storage.trans.byte_count = 0;
_mass_storage.trans.csw_valid = false;
_mass_storage.trans.csw_sent = 0;
set_sbc_status_good(&_mass_storage);
usbd_register_set_config_callback(usbd_dev, msc_set_config);
return &_mass_storage;
}
/** @} */