/* 
 * File:   stlink-sg.h
 * Author: karl
 *
 * Created on October 1, 2011, 11:29 PM
 */

#ifndef STLINK_SG_H
#define	STLINK_SG_H

#ifdef	__cplusplus
extern "C" {
#endif
    
#include <libusb.h>
#include "stlink-common.h"
    
        // device access
#define RDWR		0
#define RO		1
#define SG_TIMEOUT_SEC	1 // actually 1 is about 2 sec
#define SG_TIMEOUT_MSEC	3 * 1000
    // Each CDB can be a total of 6, 10, 12, or 16 bytes, later version
    // of the SCSI standard also allow for variable-length CDBs (min. CDB is 6).
    // the stlink needs max. 10 bytes.
#define CDB_6		6
#define CDB_10		10
#define CDB_12		12
#define CDB_16		16

#define CDB_SL		10

    // Query data flow direction.
#define Q_DATA_OUT	0
#define Q_DATA_IN	1

    // The SCSI Request Sense command is used to obtain sense data
    // (error information) from a target device.
    // http://en.wikipedia.org/wiki/SCSI_Request_Sense_Command
#define SENSE_BUF_LEN		32



    struct stlink_libsg {
        libusb_context* libusb_ctx;
        libusb_device_handle *usb_handle;
        unsigned ep_rep;
        unsigned ep_req;
        
        int sg_fd;
        int do_scsi_pt_err;

        unsigned char cdb_cmd_blk[CDB_SL];

        int q_data_dir; // Q_DATA_IN, Q_DATA_OUT
        // the start of the query data in the device memory space
        uint32_t q_addr;

        // Sense (error information) data
        // obsolete, this was fed to the scsi tools
        unsigned char sense_buf[SENSE_BUF_LEN];

        reg reg;
    };

    stlink_t* stlink_v1_open(const int verbose);

#ifdef	__cplusplus
}
#endif

#endif	/* STLINK_SG_H */

