81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id: $
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*
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* Copyright (C) 2021 by Tomasz Moń
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <ctype.h>
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#include "cryptomem-sansaconnect.h"
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#include "i2c-dm320.h"
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/* Command values */
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#define WRITE_USER_ZONE 0xB0
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#define READ_USER_ZONE 0xB2
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#define SYSTEM_WRITE 0xB4
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#define SYSTEM_READ 0xB6
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#define VERIFY_CRYPTO 0xB8
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#define VERIFY_PASSWORD 0xBA
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/* SYSTEM_WRITE ADDR 1 values */
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#define WRITE_CONFIG 0x00
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#define WRITE_FUSES 0x01
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#define SEND_CHECKSUM 0x02
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#define SET_USER_ZONE 0x03
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int cryptomem_read_deviceid(char deviceid[32])
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{
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int ret;
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unsigned int i;
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unsigned char cmd_data[3];
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/* It is assumed that other I2C communication has already taken place
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* (e.g. power_init()) before this function is called and thus we don't
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* have to send atleast 5 dummy clock cycles here.
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*/
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cmd_data[0] = SET_USER_ZONE;
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cmd_data[1] = 0;
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cmd_data[2] = 0;
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ret = i2c_write(SYSTEM_WRITE, cmd_data, sizeof(cmd_data));
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if (ret < 0)
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{
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return ret;
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}
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cmd_data[0] = 0;
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cmd_data[1] = 0;
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cmd_data[2] = 32;
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ret = i2c_write_read_bytes(READ_USER_ZONE, cmd_data, sizeof(cmd_data),
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deviceid, 32);
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if (ret < 0)
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{
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return ret;
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}
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/* Verify that deviceid contains only printable ASCII characters */
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for (i = 0; i < 32; i++)
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{
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if (!isprint(deviceid[i]))
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{
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return -1;
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}
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}
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return 0;
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}
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