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- /* SPDX-License-Identifier: GPL-2.0+ */
- /*
- * Emulation of enough SCSI commands to find and read from a unit
- *
- * Copyright 2022 Google LLC
- * Written by Simon Glass <sjg@chromium.org>
- *
- * implementations of SCSI functions required so that CONFIG_SCSI can be enabled
- * for sandbox
- */
- #ifndef __scsi_emul_h
- #define __scsi_emul_h
- /**
- * struct scsi_emul_info - information for emulating a SCSI device
- *
- * @vendor: Vendor name
- * @product: Product name
- * @block_size: Block size of device in bytes (normally 512)
- * @file_size: Size of the backing file for this emulator, in bytes
- * @seek_block: Seek position for file (block number)
- *
- * @phase: Current SCSI phase
- * @buff_used: Number of bytes ready to transfer back to host
- * @read_len: Number of bytes of data left in the current read command
- * @alloc_len: Allocation length from the last incoming command
- * @transfer_len: Transfer length from CBW header
- * @buff: Data buffer for outgoing data
- */
- struct scsi_emul_info {
- /* provided by the caller: */
- void *buff;
- const char *vendor;
- const char *product;
- int block_size;
- loff_t file_size;
- int seek_block;
- /* state maintained by the emulator: */
- enum scsi_cmd_phase phase;
- int buff_used;
- int read_len;
- int write_len;
- uint seek_pos;
- int alloc_len;
- uint transfer_len;
- };
- /**
- * Return value from sb_scsi_emul_command() indicates that a read or write is
- * being started
- */
- enum {
- SCSI_EMUL_DO_READ = 1,
- SCSI_EMUL_DO_WRITE = 2,
- };
- /**
- * sb_scsi_emul_command() - Process a SCSI command
- *
- * This sets up the response in info->buff and updates various other values
- * in info.
- *
- * If SCSI_EMUL_DO_READ is returned then the caller should set up so that the
- * backing file can be read, or return an error status if there is no file.
- *
- * @info: Emulation information
- * @req: Request to process
- * @len: Length of request in bytes
- * @return SCSI_EMUL_DO_READ if a read has started, SCSI_EMUL_DO_WRITE if a
- * write has started, 0 if some other operation has started, -ve if there
- * was an error
- */
- int sb_scsi_emul_command(struct scsi_emul_info *info,
- const struct scsi_cmd *req, int len);
- #endif
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