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/*
* Copyright 2013 GE Intelligent Platforms Inc.
* Copyright 2019 Abaco Systems Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* Retrieve and check the product data.
*/
#include <common.h>
#include <crc.h>
#include <i2c/i2c.h>
#include <mach/immap_85xx.h>
#include <mach/fsl_i2c.h>
#include "product_data.h"
static int owc_pd_header_check(unsigned short header)
{
if (header != 0xa5a5)
return -1;
else
return 0;
}
static int owc_is_data_valid(struct owc_product_data *v)
{
int crc, ret = 0;
const unsigned char *p = (const unsigned char *)v;
if (owc_pd_header_check(v->v1.pdh.tag))
return -1;
switch (v->v1.pdh.version) {
case PDVERSION_V1:
case PDVERSION_V1bis:
crc = crc32(0, p, sizeof(struct product_data_v1) - 4);
if (crc != v->v1.crc32)
ret = -1;
break;
case PDVERSION_V2:
crc = crc32(0, p, sizeof(struct product_data_v2) - 4);
if (crc != v->v2.crc32)
ret = -1;
break;
default:
ret = -1;
}
return ret;
}
int owc_get_product_data(struct owc_product_data *productp)
{
struct i2c_adapter *adapter;
struct i2c_client client;
unsigned int width = 0;
int ret;
adapter = i2c_get_adapter(0);
client.addr = 0x51;
client.adapter = adapter;
ret = i2c_read_reg(&client, 0, (uint8_t *) productp,
sizeof(unsigned short));
/* If there is no valid header, it may be a 16-bit eeprom. */
if (owc_pd_header_check(productp->v1.pdh.tag))
width = I2C_ADDR_16_BIT;
ret = i2c_read_reg(&client, width, (uint8_t *) productp,
sizeof(struct owc_product_data));
if (ret == sizeof(struct owc_product_data))
ret = owc_is_data_valid(productp);
return ret;
}
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