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/*
*
* Copyright 2015-present Facebook. All Rights Reserved.
*
* This file contains code to support IPMI2.0 Specificaton available @
* http://www.intel.com/content/www/us/en/servers/ipmi/ipmi-specifications.html
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <math.h>
#include <fcntl.h>
#include <errno.h>
#include <syslog.h>
#include "sdr.h"
#define FIELD_RATE_UNIT(x) ((x & (0x07 << 3)) >> 3)
#define FIELD_OP(x) ((x & (0x03 << 1)) >> 1)
#define FIELD_PERCENTAGE(x) (x & 0x01)
#define FIELD_TYPE(x) ((x & (0x03 << 6)) >> 6)
#define FIELD_LEN(x) (x & 0xF)
/* Array for BCD Plus definition. */
const char bcd_plus_array[] = "0123456789 -.XXX";
/* Array for 6-Bit ASCII definition. */
const char * ascii_6bit[4] = {
" !\"#$%&'()*+,-./",
"0123456789:;<=>?",
"@ABCDEFGHIJKLMNO",
"PQRSTUVWXYZ[\\]^_"
};
/* Get the units of the sensor from the SDR */
int
sdr_get_sensor_units(sdr_full_t *sdr, uint8_t *op, uint8_t *modifier,
char *units) {
uint8_t percent;
uint8_t rate_idx;
uint8_t base_idx;
/* Bits 5:3 */
rate_idx = FIELD_RATE_UNIT(sdr->sensor_units1);
/* Bits 2:1 */
*op = FIELD_OP(sdr->sensor_units1);
/* Bit 0 */
percent = FIELD_PERCENTAGE(sdr->sensor_units1);
base_idx = sdr->sensor_units2;
if (*op == 0x0 || *op == 0x3)
*modifier = 0;
else
*modifier = sdr->sensor_units3;
if (percent) {
sprintf(units, "%");
} else {
if (base_idx > 0 && base_idx <= MAX_SENSOR_BASE_UNIT) {
if (rate_idx > 0 && rate_idx < MAX_SENSOR_RATE_UNIT) {
sprintf(units, "%s %s", sensor_base_units[base_idx],
sensor_rate_units[rate_idx]);
} else {
sprintf(units, "%s", sensor_base_units[base_idx]);
}
}
}
return 0;
}
/* Get the name of the sensor from the SDR */
int
sdr_get_sensor_name(sdr_full_t *sdr, char *name) {
int field_type, field_len;
int idx, idx_eff, val;
char *str;
/* Bits 7:6 */
field_type = FIELD_TYPE(sdr->str_type_len);
/* Bits 4:0 */
field_len = FIELD_LEN(sdr->str_type_len) + 1;
str = sdr->str;
/* Case: length is zero */
if (field_len == 1) {
syslog(LOG_ALERT, "get_sensor_name: str length is 0\n");
// TODO: Fix this hack later
sprintf(name, "%s", str);
return -1;
}
/* Retrieve field data depending on the type it was stored. */
switch (field_type) {
case TYPE_BINARY:
/* TODO: Need to add support to read data stored in binary type. */
break;
case TYPE_BCD_PLUS:
idx = 0;
while (idx != field_len) {
name[idx] = bcd_plus_array[str[idx] & 0x0F];
idx++;
}
name[idx] = '\0';
break;
case TYPE_ASCII_6BIT:
idx_eff = idx = 0;
while (field_len > 0) {
/* 6-Bits => Bits 5:0 of the first byte */
val = str[idx] & 0x3F;
name[idx_eff++] = ascii_6bit[(val & 0xF0) >> 4][val & 0x0F];
field_len--;
if (field_len > 0) {
/* 6-Bits => Bits 3:0 of second byte + Bits 7:6 of first byte. */
val = ((str[idx] & 0xC0) >> 6) |
((str[idx + 1] & 0x0F) << 2);
name[idx_eff++] = ascii_6bit[(val & 0xF0) >> 4][val & 0x0F];
field_len--;
}
if (field_len > 0) {
/* 6-Bits => Bits 1:0 of third byte + Bits 7:4 of second byte. */
val = ((str[idx + 1] & 0xF0) >> 4) |
((str[idx + 2] & 0x03) << 4);
name[idx_eff++] = ascii_6bit[(val & 0xF0) >> 4][val & 0x0F];
/* 6-Bits => Bits 7:2 of third byte. */
val = ((str[idx + 2] & 0xFC) >> 2);
name[idx_eff++] = ascii_6bit[(val & 0xF0) >> 4][val & 0x0F];
field_len--;
idx += 3;
}
}
/* Add Null terminator */
name[idx_eff] = '\0';
break;
case TYPE_ASCII_8BIT:
snprintf(name, field_len, str);
/* Add Null terminator */
name[field_len] = '\0';
break;
}
return 0;
}
/* Populates all sensor_info_t struct using the path to SDR dump */
int
sdr_init(char *path, sensor_info_t *sinfo) {
int fd;
uint8_t buf[MAX_SDR_LEN] = {0};
uint8_t bytes_rd = 0;
uint8_t snr_num = 0;
sdr_full_t *sdr;
while (access(path, F_OK) == -1) {
sleep(5);
}
fd = open(path, O_RDONLY);
if (fd < 0) {
syslog(LOG_ERR, "sdr_init: open failed for %s\n", path);
return -1;
}
while ((bytes_rd = read(fd, buf, sizeof(sdr_full_t))) > 0) {
if (bytes_rd != sizeof(sdr_full_t)) {
syslog(LOG_ERR, "sdr_init: read returns %d bytes\n", bytes_rd);
return -1;
}
sdr = (sdr_full_t *) buf;
snr_num = sdr->sensor_num;
sinfo[snr_num].valid = true;
memcpy(&sinfo[snr_num].sdr, sdr, sizeof(sdr_full_t));
}
return 0;
}
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