diff options
Diffstat (limited to 'tinyusb/src/class/msc/msc_device.c')
| -rwxr-xr-x | tinyusb/src/class/msc/msc_device.c | 705 |
1 files changed, 705 insertions, 0 deletions
diff --git a/tinyusb/src/class/msc/msc_device.c b/tinyusb/src/class/msc/msc_device.c new file mode 100755 index 00000000..014e8b69 --- /dev/null +++ b/tinyusb/src/class/msc/msc_device.c @@ -0,0 +1,705 @@ +/* + * The MIT License (MIT) + * + * Copyright (c) 2019 Ha Thach (tinyusb.org) + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + * + * This file is part of the TinyUSB stack. + */ + +#include "tusb_option.h" + +#if (TUSB_OPT_DEVICE_ENABLED && CFG_TUD_MSC) + +#include "device/usbd.h" +#include "device/usbd_pvt.h" +#include "device/dcd.h" // for faking dcd_event_xfer_complete + +#include "msc_device.h" + +//--------------------------------------------------------------------+ +// MACRO CONSTANT TYPEDEF +//--------------------------------------------------------------------+ + +// Can be selectively disabled to reduce logging when troubleshooting other driver +#define MSC_DEBUG 2 + +enum +{ + MSC_STAGE_CMD = 0, + MSC_STAGE_DATA, + MSC_STAGE_STATUS, + MSC_STAGE_STATUS_SENT +}; + +typedef struct +{ + // TODO optimize alignment + CFG_TUSB_MEM_ALIGN msc_cbw_t cbw; + CFG_TUSB_MEM_ALIGN msc_csw_t csw; + + uint8_t itf_num; + uint8_t ep_in; + uint8_t ep_out; + + // Bulk Only Transfer (BOT) Protocol + uint8_t stage; + uint32_t total_len; + uint32_t xferred_len; // numbered of bytes transferred so far in the Data Stage + + // Sense Response Data + uint8_t sense_key; + uint8_t add_sense_code; + uint8_t add_sense_qualifier; +}mscd_interface_t; + +CFG_TUSB_MEM_SECTION CFG_TUSB_MEM_ALIGN static mscd_interface_t _mscd_itf; +CFG_TUSB_MEM_SECTION CFG_TUSB_MEM_ALIGN static uint8_t _mscd_buf[CFG_TUD_MSC_EP_BUFSIZE]; + +//--------------------------------------------------------------------+ +// INTERNAL OBJECT & FUNCTION DECLARATION +//--------------------------------------------------------------------+ +static int32_t proc_builtin_scsi(uint8_t lun, uint8_t const scsi_cmd[16], uint8_t* buffer, uint32_t bufsize); +static void proc_read10_cmd(uint8_t rhport, mscd_interface_t* p_msc); +static void proc_write10_cmd(uint8_t rhport, mscd_interface_t* p_msc); + +static inline uint32_t rdwr10_get_lba(uint8_t const command[]) +{ + // use offsetof to avoid pointer to the odd/unaligned address + uint32_t const lba = tu_unaligned_read32(command + offsetof(scsi_write10_t, lba)); + + // lba is in Big Endian + return tu_ntohl(lba); +} + +static inline uint16_t rdwr10_get_blockcount(uint8_t const command[]) +{ + // use offsetof to avoid pointer to the odd/misaligned address + uint16_t const block_count = tu_unaligned_read16(command + offsetof(scsi_write10_t, block_count)); + + // block count is in Big Endian + return tu_ntohs(block_count); +} + +//--------------------------------------------------------------------+ +// Debug +//--------------------------------------------------------------------+ +#if CFG_TUSB_DEBUG >= 2 + +TU_ATTR_UNUSED static tu_lookup_entry_t const _msc_scsi_cmd_lookup[] = +{ + { .key = SCSI_CMD_TEST_UNIT_READY , .data = "Test Unit Ready" }, + { .key = SCSI_CMD_INQUIRY , .data = "Inquiry" }, + { .key = SCSI_CMD_MODE_SELECT_6 , .data = "Mode_Select 6" }, + { .key = SCSI_CMD_MODE_SENSE_6 , .data = "Mode_Sense 6" }, + { .key = SCSI_CMD_START_STOP_UNIT , .data = "Start Stop Unit" }, + { .key = SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL , .data = "Prevent Allow Medium Removal" }, + { .key = SCSI_CMD_READ_CAPACITY_10 , .data = "Read Capacity10" }, + { .key = SCSI_CMD_REQUEST_SENSE , .data = "Request Sense" }, + { .key = SCSI_CMD_READ_FORMAT_CAPACITY , .data = "Read Format Capacity" }, + { .key = SCSI_CMD_READ_10 , .data = "Read10" }, + { .key = SCSI_CMD_WRITE_10 , .data = "Write10" } +}; + +TU_ATTR_UNUSED static tu_lookup_table_t const _msc_scsi_cmd_table = +{ + .count = TU_ARRAY_SIZE(_msc_scsi_cmd_lookup), + .items = _msc_scsi_cmd_lookup +}; + +#endif + +//--------------------------------------------------------------------+ +// APPLICATION API +//--------------------------------------------------------------------+ +bool tud_msc_set_sense(uint8_t lun, uint8_t sense_key, uint8_t add_sense_code, uint8_t add_sense_qualifier) +{ + (void) lun; + + _mscd_itf.sense_key = sense_key; + _mscd_itf.add_sense_code = add_sense_code; + _mscd_itf.add_sense_qualifier = add_sense_qualifier; + + return true; +} + +//--------------------------------------------------------------------+ +// USBD Driver API +//--------------------------------------------------------------------+ +void mscd_init(void) +{ + tu_memclr(&_mscd_itf, sizeof(mscd_interface_t)); +} + +void mscd_reset(uint8_t rhport) +{ + (void) rhport; + tu_memclr(&_mscd_itf, sizeof(mscd_interface_t)); +} + +uint16_t mscd_open(uint8_t rhport, tusb_desc_interface_t const * itf_desc, uint16_t max_len) +{ + // only support SCSI's BOT protocol + TU_VERIFY(TUSB_CLASS_MSC == itf_desc->bInterfaceClass && + MSC_SUBCLASS_SCSI == itf_desc->bInterfaceSubClass && + MSC_PROTOCOL_BOT == itf_desc->bInterfaceProtocol, 0); + + // msc driver length is fixed + uint16_t const drv_len = sizeof(tusb_desc_interface_t) + 2*sizeof(tusb_desc_endpoint_t); + + // Max length mus be at least 1 interface + 2 endpoints + TU_ASSERT(max_len >= drv_len, 0); + + mscd_interface_t * p_msc = &_mscd_itf; + p_msc->itf_num = itf_desc->bInterfaceNumber; + + // Open endpoint pair + TU_ASSERT( usbd_open_edpt_pair(rhport, tu_desc_next(itf_desc), 2, TUSB_XFER_BULK, &p_msc->ep_out, &p_msc->ep_in), 0 ); + + // Prepare for Command Block Wrapper + if ( !usbd_edpt_xfer(rhport, p_msc->ep_out, (uint8_t*) &p_msc->cbw, sizeof(msc_cbw_t)) ) + { + TU_LOG_FAILED(); + TU_BREAKPOINT(); + } + + return drv_len; +} + +// Invoked when a control transfer occurred on an interface of this class +// Driver response accordingly to the request and the transfer stage (setup/data/ack) +// return false to stall control endpoint (e.g unsupported request) +bool mscd_control_xfer_cb(uint8_t rhport, uint8_t stage, tusb_control_request_t const * p_request) +{ + // nothing to do with DATA & ACK stage + if (stage != CONTROL_STAGE_SETUP) return true; + + // Handle class request only + TU_VERIFY(p_request->bmRequestType_bit.type == TUSB_REQ_TYPE_CLASS); + + switch ( p_request->bRequest ) + { + case MSC_REQ_RESET: + // TODO: Actually reset interface. + tud_control_status(rhport, p_request); + break; + + case MSC_REQ_GET_MAX_LUN: + { + uint8_t maxlun = 1; + if (tud_msc_get_maxlun_cb) maxlun = tud_msc_get_maxlun_cb(); + TU_VERIFY(maxlun); + + // MAX LUN is minus 1 by specs + maxlun--; + + tud_control_xfer(rhport, p_request, &maxlun, 1); + } + break; + + default: return false; // stall unsupported request + } + + return true; +} + +bool mscd_xfer_cb(uint8_t rhport, uint8_t ep_addr, xfer_result_t event, uint32_t xferred_bytes) +{ + mscd_interface_t* p_msc = &_mscd_itf; + msc_cbw_t const * p_cbw = &p_msc->cbw; + msc_csw_t * p_csw = &p_msc->csw; + + switch (p_msc->stage) + { + case MSC_STAGE_CMD: + //------------- new CBW received -------------// + // Complete IN while waiting for CMD is usually Status of previous SCSI op, ignore it + if(ep_addr != p_msc->ep_out) return true; + + TU_ASSERT( event == XFER_RESULT_SUCCESS && + xferred_bytes == sizeof(msc_cbw_t) && p_cbw->signature == MSC_CBW_SIGNATURE ); + + TU_LOG(MSC_DEBUG, " SCSI Command: %s\r\n", tu_lookup_find(&_msc_scsi_cmd_table, p_cbw->command[0])); + // TU_LOG_MEM(MSC_DEBUG, p_cbw, xferred_bytes, 2); + + p_csw->signature = MSC_CSW_SIGNATURE; + p_csw->tag = p_cbw->tag; + p_csw->data_residue = 0; + + /*------------- Parse command and prepare DATA -------------*/ + p_msc->stage = MSC_STAGE_DATA; + p_msc->total_len = p_cbw->total_bytes; + p_msc->xferred_len = 0; + + if (SCSI_CMD_READ_10 == p_cbw->command[0]) + { + proc_read10_cmd(rhport, p_msc); + } + else if (SCSI_CMD_WRITE_10 == p_cbw->command[0]) + { + proc_write10_cmd(rhport, p_msc); + } + else + { + // For other SCSI commands + // 1. OUT : queue transfer (invoke app callback after done) + // 2. IN & Zero: Process if is built-in, else Invoke app callback. Skip DATA if zero length + if ( (p_cbw->total_bytes > 0 ) && !tu_bit_test(p_cbw->dir, 7) ) + { + // queue transfer + TU_ASSERT( usbd_edpt_xfer(rhport, p_msc->ep_out, _mscd_buf, p_msc->total_len) ); + }else + { + int32_t resplen; + + // First process if it is a built-in commands + resplen = proc_builtin_scsi(p_cbw->lun, p_cbw->command, _mscd_buf, sizeof(_mscd_buf)); + + // Not built-in, invoke user callback + if ( (resplen < 0) && (p_msc->sense_key == 0) ) + { + resplen = tud_msc_scsi_cb(p_cbw->lun, p_cbw->command, _mscd_buf, p_msc->total_len); + } + + if ( resplen < 0 ) + { + p_msc->total_len = 0; + p_csw->status = MSC_CSW_STATUS_FAILED; + p_msc->stage = MSC_STAGE_STATUS; + + // failed but senskey is not set: default to Illegal Request + if ( p_msc->sense_key == 0 ) tud_msc_set_sense(p_cbw->lun, SCSI_SENSE_ILLEGAL_REQUEST, 0x20, 0x00); + + // Stall bulk In if needed + if (p_cbw->total_bytes) usbd_edpt_stall(rhport, p_msc->ep_in); + } + else + { + p_msc->total_len = (uint32_t) resplen; + p_csw->status = MSC_CSW_STATUS_PASSED; + + if (p_msc->total_len) + { + TU_ASSERT( p_cbw->total_bytes >= p_msc->total_len ); // cannot return more than host expect + TU_ASSERT( usbd_edpt_xfer(rhport, p_msc->ep_in, _mscd_buf, p_msc->total_len) ); + }else + { + p_msc->stage = MSC_STAGE_STATUS; + } + } + } + } + break; + + case MSC_STAGE_DATA: + TU_LOG(MSC_DEBUG, " SCSI Data\r\n"); + //TU_LOG_MEM(MSC_DEBUG, _mscd_buf, xferred_bytes, 2); + + // OUT transfer, invoke callback if needed + if ( !tu_bit_test(p_cbw->dir, 7) ) + { + if ( SCSI_CMD_WRITE_10 != p_cbw->command[0] ) + { + int32_t cb_result = tud_msc_scsi_cb(p_cbw->lun, p_cbw->command, _mscd_buf, p_msc->total_len); + + if ( cb_result < 0 ) + { + p_csw->status = MSC_CSW_STATUS_FAILED; + tud_msc_set_sense(p_cbw->lun, SCSI_SENSE_ILLEGAL_REQUEST, 0x20, 0x00); // Sense = Invalid Command Operation + }else + { + p_csw->status = MSC_CSW_STATUS_PASSED; + } + } + else + { + uint16_t const block_sz = p_cbw->total_bytes / rdwr10_get_blockcount(p_cbw->command); + + // Adjust lba with transferred bytes + uint32_t const lba = rdwr10_get_lba(p_cbw->command) + (p_msc->xferred_len / block_sz); + + // Application can consume smaller bytes + int32_t nbytes = tud_msc_write10_cb(p_cbw->lun, lba, p_msc->xferred_len % block_sz, _mscd_buf, xferred_bytes); + + if ( nbytes < 0 ) + { + // negative means error -> skip to status phase, status in CSW set to failed + p_csw->data_residue = p_cbw->total_bytes - p_msc->xferred_len; + p_csw->status = MSC_CSW_STATUS_FAILED; + p_msc->stage = MSC_STAGE_STATUS; + + tud_msc_set_sense(p_cbw->lun, SCSI_SENSE_ILLEGAL_REQUEST, 0x20, 0x00); // Sense = Invalid Command Operation + break; + }else + { + // Application consume less than what we got (including zero) + if ( nbytes < (int32_t) xferred_bytes ) + { + if ( nbytes > 0 ) + { + p_msc->xferred_len += nbytes; + memmove(_mscd_buf, _mscd_buf+nbytes, xferred_bytes-nbytes); + } + + // simulate an transfer complete with adjusted parameters --> this driver callback will fired again + dcd_event_xfer_complete(rhport, p_msc->ep_out, xferred_bytes-nbytes, XFER_RESULT_SUCCESS, false); + + return true; // skip the rest + } + else + { + // Application consume all bytes in our buffer. Nothing to do, process with normal flow + } + } + } + } + + // Accumulate data so far + p_msc->xferred_len += xferred_bytes; + + if ( p_msc->xferred_len >= p_msc->total_len ) + { + // Data Stage is complete + p_msc->stage = MSC_STAGE_STATUS; + } + else + { + // READ10 & WRITE10 Can be executed with large bulk of data e.g write 8K bytes (several flash write) + // We break it into multiple smaller command whose data size is up to CFG_TUD_MSC_EP_BUFSIZE + if (SCSI_CMD_READ_10 == p_cbw->command[0]) + { + proc_read10_cmd(rhport, p_msc); + } + else if (SCSI_CMD_WRITE_10 == p_cbw->command[0]) + { + proc_write10_cmd(rhport, p_msc); + }else + { + // No other command take more than one transfer yet -> unlikely error + TU_BREAKPOINT(); + } + } + break; + + case MSC_STAGE_STATUS: + // processed immediately after this switch, supposedly to be empty + break; + + case MSC_STAGE_STATUS_SENT: + // Wait for the Status phase to complete + if( (ep_addr == p_msc->ep_in) && (xferred_bytes == sizeof(msc_csw_t)) ) + { + TU_LOG(MSC_DEBUG, " SCSI Status: %u\r\n", p_csw->status); + // TU_LOG_MEM(MSC_DEBUG, p_csw, xferred_bytes, 2); + + // Invoke complete callback if defined + // Note: There is racing issue with samd51 + qspi flash testing with arduino + // if complete_cb() is invoked after queuing the status. + switch(p_cbw->command[0]) + { + case SCSI_CMD_READ_10: + if ( tud_msc_read10_complete_cb ) tud_msc_read10_complete_cb(p_cbw->lun); + break; + + case SCSI_CMD_WRITE_10: + if ( tud_msc_write10_complete_cb ) tud_msc_write10_complete_cb(p_cbw->lun); + break; + + default: + if ( tud_msc_scsi_complete_cb ) tud_msc_scsi_complete_cb(p_cbw->lun, p_cbw->command); + break; + } + + // Move to default CMD stage + p_msc->stage = MSC_STAGE_CMD; + + // Queue for the next CBW + TU_ASSERT( usbd_edpt_xfer(rhport, p_msc->ep_out, (uint8_t*) &p_msc->cbw, sizeof(msc_cbw_t)) ); + } + break; + + default : break; + } + + if ( p_msc->stage == MSC_STAGE_STATUS ) + { + // Either endpoints is stalled, need to wait until it is cleared by host + if ( usbd_edpt_stalled(rhport, p_msc->ep_in) || usbd_edpt_stalled(rhport, p_msc->ep_out) ) + { + // simulate an transfer complete with adjusted parameters --> this driver callback will fired again + // and response with status phase after halted endpoints are cleared. + // note: use ep_out to prevent confusing with STATUS complete + dcd_event_xfer_complete(rhport, p_msc->ep_out, 0, XFER_RESULT_SUCCESS, false); + } + else + { + // Move to Status Sent stage + p_msc->stage = MSC_STAGE_STATUS_SENT; + + // Send SCSI Status + TU_ASSERT(usbd_edpt_xfer(rhport, p_msc->ep_in , (uint8_t*) &p_msc->csw, sizeof(msc_csw_t))); + } + } + + return true; +} + +/*------------------------------------------------------------------*/ +/* SCSI Command Process + *------------------------------------------------------------------*/ + +// return response's length (copied to buffer). Negative if it is not an built-in command or indicate Failed status (CSW) +// In case of a failed status, sense key must be set for reason of failure +static int32_t proc_builtin_scsi(uint8_t lun, uint8_t const scsi_cmd[16], uint8_t* buffer, uint32_t bufsize) +{ + (void) bufsize; // TODO refractor later + int32_t resplen; + + switch ( scsi_cmd[0] ) + { + case SCSI_CMD_TEST_UNIT_READY: + resplen = 0; + if ( !tud_msc_test_unit_ready_cb(lun) ) + { + // Failed status response + resplen = - 1; + + // If sense key is not set by callback, default to Logical Unit Not Ready, Cause Not Reportable + if ( _mscd_itf.sense_key == 0 ) tud_msc_set_sense(lun, SCSI_SENSE_NOT_READY, 0x04, 0x00); + } + break; + + case SCSI_CMD_START_STOP_UNIT: + resplen = 0; + + if (tud_msc_start_stop_cb) + { + scsi_start_stop_unit_t const * start_stop = (scsi_start_stop_unit_t const *) scsi_cmd; + if ( !tud_msc_start_stop_cb(lun, start_stop->power_condition, start_stop->start, start_stop->load_eject) ) + { + // Failed status response + resplen = - 1; + + // If sense key is not set by callback, default to Logical Unit Not Ready, Cause Not Reportable + if ( _mscd_itf.sense_key == 0 ) tud_msc_set_sense(lun, SCSI_SENSE_NOT_READY, 0x04, 0x00); + } + } + break; + + case SCSI_CMD_READ_CAPACITY_10: + { + uint32_t block_count; + uint32_t block_size; + uint16_t block_size_u16; + + tud_msc_capacity_cb(lun, &block_count, &block_size_u16); + block_size = (uint32_t) block_size_u16; + + // Invalid block size/count from callback, possibly unit is not ready + // stall this request, set sense key to NOT READY + if (block_count == 0 || block_size == 0) + { + resplen = -1; + + // If sense key is not set by callback, default to Logical Unit Not Ready, Cause Not Reportable + if ( _mscd_itf.sense_key == 0 ) tud_msc_set_sense(lun, SCSI_SENSE_NOT_READY, 0x04, 0x00); + }else + { + scsi_read_capacity10_resp_t read_capa10; + + read_capa10.last_lba = tu_htonl(block_count-1); + read_capa10.block_size = tu_htonl(block_size); + + resplen = sizeof(read_capa10); + memcpy(buffer, &read_capa10, resplen); + } + } + break; + + case SCSI_CMD_READ_FORMAT_CAPACITY: + { + scsi_read_format_capacity_data_t read_fmt_capa = + { + .list_length = 8, + .block_num = 0, + .descriptor_type = 2, // formatted media + .block_size_u16 = 0 + }; + + uint32_t block_count; + uint16_t block_size; + + tud_msc_capacity_cb(lun, &block_count, &block_size); + + // Invalid block size/count from callback, possibly unit is not ready + // stall this request, set sense key to NOT READY + if (block_count == 0 || block_size == 0) + { + resplen = -1; + + // If sense key is not set by callback, default to Logical Unit Not Ready, Cause Not Reportable + if ( _mscd_itf.sense_key == 0 ) tud_msc_set_sense(lun, SCSI_SENSE_NOT_READY, 0x04, 0x00); + }else + { + read_fmt_capa.block_num = tu_htonl(block_count); + read_fmt_capa.block_size_u16 = tu_htons(block_size); + + resplen = sizeof(read_fmt_capa); + memcpy(buffer, &read_fmt_capa, resplen); + } + } + break; + + case SCSI_CMD_INQUIRY: + { + scsi_inquiry_resp_t inquiry_rsp = + { + .is_removable = 1, + .version = 2, + .response_data_format = 2, + }; + + // vendor_id, product_id, product_rev is space padded string + memset(inquiry_rsp.vendor_id , ' ', sizeof(inquiry_rsp.vendor_id)); + memset(inquiry_rsp.product_id , ' ', sizeof(inquiry_rsp.product_id)); + memset(inquiry_rsp.product_rev, ' ', sizeof(inquiry_rsp.product_rev)); + + tud_msc_inquiry_cb(lun, inquiry_rsp.vendor_id, inquiry_rsp.product_id, inquiry_rsp.product_rev); + + resplen = sizeof(inquiry_rsp); + memcpy(buffer, &inquiry_rsp, resplen); + } + break; + + case SCSI_CMD_MODE_SENSE_6: + { + scsi_mode_sense6_resp_t mode_resp = + { + .data_len = 3, + .medium_type = 0, + .write_protected = false, + .reserved = 0, + .block_descriptor_len = 0 // no block descriptor are included + }; + + bool writable = true; + if (tud_msc_is_writable_cb) { + writable = tud_msc_is_writable_cb(lun); + } + mode_resp.write_protected = !writable; + + resplen = sizeof(mode_resp); + memcpy(buffer, &mode_resp, resplen); + } + break; + + case SCSI_CMD_REQUEST_SENSE: + { + scsi_sense_fixed_resp_t sense_rsp = + { + .response_code = 0x70, + .valid = 1 + }; + + sense_rsp.add_sense_len = sizeof(scsi_sense_fixed_resp_t) - 8; + + sense_rsp.sense_key = _mscd_itf.sense_key; + sense_rsp.add_sense_code = _mscd_itf.add_sense_code; + sense_rsp.add_sense_qualifier = _mscd_itf.add_sense_qualifier; + + resplen = sizeof(sense_rsp); + memcpy(buffer, &sense_rsp, resplen); + + // Clear sense data after copy + tud_msc_set_sense(lun, 0, 0, 0); + } + break; + + default: resplen = -1; break; + } + + return resplen; +} + +static void proc_read10_cmd(uint8_t rhport, mscd_interface_t* p_msc) +{ + msc_cbw_t const * p_cbw = &p_msc->cbw; + msc_csw_t * p_csw = &p_msc->csw; + + uint16_t const block_cnt = rdwr10_get_blockcount(p_cbw->command); + TU_ASSERT(block_cnt, ); // prevent div by zero + + uint16_t const block_sz = p_cbw->total_bytes / block_cnt; + TU_ASSERT(block_sz, ); // prevent div by zero + + // Adjust lba with transferred bytes + uint32_t const lba = rdwr10_get_lba(p_cbw->command) + (p_msc->xferred_len / block_sz); + + // remaining bytes capped at class buffer + int32_t nbytes = (int32_t) tu_min32(sizeof(_mscd_buf), p_cbw->total_bytes-p_msc->xferred_len); + + // Application can consume smaller bytes + nbytes = tud_msc_read10_cb(p_cbw->lun, lba, p_msc->xferred_len % block_sz, _mscd_buf, (uint32_t) nbytes); + + if ( nbytes < 0 ) + { + // negative means error -> pipe is stalled & status in CSW set to failed + p_csw->data_residue = p_cbw->total_bytes - p_msc->xferred_len; + p_csw->status = MSC_CSW_STATUS_FAILED; + + tud_msc_set_sense(p_cbw->lun, SCSI_SENSE_ILLEGAL_REQUEST, 0x20, 0x00); // Sense = Invalid Command Operation + usbd_edpt_stall(rhport, p_msc->ep_in); + } + else if ( nbytes == 0 ) + { + // zero means not ready -> simulate an transfer complete so that this driver callback will fired again + dcd_event_xfer_complete(rhport, p_msc->ep_in, 0, XFER_RESULT_SUCCESS, false); + } + else + { + TU_ASSERT( usbd_edpt_xfer(rhport, p_msc->ep_in, _mscd_buf, nbytes), ); + } +} + +static void proc_write10_cmd(uint8_t rhport, mscd_interface_t* p_msc) +{ + msc_cbw_t const * p_cbw = &p_msc->cbw; + bool writable = true; + if (tud_msc_is_writable_cb) { + writable = tud_msc_is_writable_cb(p_cbw->lun); + } + if (!writable) { + msc_csw_t* p_csw = &p_msc->csw; + p_csw->data_residue = p_cbw->total_bytes; + p_csw->status = MSC_CSW_STATUS_FAILED; + + tud_msc_set_sense(p_cbw->lun, SCSI_SENSE_DATA_PROTECT, 0x27, 0x00); // Sense = Write protected + usbd_edpt_stall(rhport, p_msc->ep_out); + return; + } + + // remaining bytes capped at class buffer + int32_t nbytes = (int32_t) tu_min32(sizeof(_mscd_buf), p_cbw->total_bytes-p_msc->xferred_len); + + // Write10 callback will be called later when usb transfer complete + TU_ASSERT( usbd_edpt_xfer(rhport, p_msc->ep_out, _mscd_buf, nbytes), ); +} + +#endif |