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#!/bin/bash
# Copyright 2020 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#################################################################
# Prints CPLD version and save it in file /run/cpld0.version
#
# CPLD version format: Major.Minor.Point.Subpoint
#
# Major/Minor: base vendor image version, encoded in register 0x0 of the CPLD
# I2C bus.
# Major = higher 4 bits of register 0x00
# Minor = lower 4 bits of register 0x00
# Point/SubPoint: reserved as 0x0 for now
#
# e.g. reg[0] = 0x25 -> ver 2.5.0.0
#
#################################################################
CPLD_I2C_BUS_NUM=13
CPLD_I2C_BUS_ADDR='0x21'
CPLD_I2C_BASEVER_REG='0x00'
VER_ENV_FILE='/run/cpld0.version'
#################################################################
# Parse the byte value from i2cget and sanity checks the hex format
# Arguments:
# $1: i2c_bus_num
# $2: i2c_bus_addr
# $3: i2c_reg
# Global:
# 'byte_val' will be written with the numeric value from i2cget
# Returns:
# 0 if success, non-zero if failed to get the value or value is malformed
#################################################################
read_and_check_i2c_get() {
if ! (( $# == 3 )); then
echo "Usage: read_and_check_i2c_get i2c_bus_num i2c_bus_addr i2c_reg"
return 1
fi
local i2c_bus_num=$1
local i2c_bus_addr=$2
local i2c_reg=$3
local i2c_val_raw
i2c_val_raw=$(i2cget -y "${i2c_bus_num}" "${i2c_bus_addr}" "${i2c_reg}") || return
# Verify that it is of format 0x[hex][hex].
local HEXBYTE_RE='^0x[0-9A-Fa-f]{2}$'
if ! [[ ${i2c_val_raw} =~ ${HEXBYTE_RE} ]]; then
echo "i2cget $* outputs invalid value: ${i2c_val_raw}"
return 1
fi
((byte_val = i2c_val_raw))
return 0
}
#################################################################
# Prints CPLD version in Major.Minor.Point.Subpoint format.
# Each dot separated field is decimal number with no leading zeros.
# Arguments:
# None
# Globals:
# Write parsed version into the following global variables:
# cpld_ver_major
# cpld_ver_minor
# cpld_point
# cpld_subpoint
# Returns:
# 0 if success, non-zero otherwise
#################################################################
parse_cpld_ver() {
# Stores the output of read_and_check_i2c_get
local byte_val
# Read a byte, assign higher 4 bits to cpld_ver_major and lower 4 bits to
# cpld_ver_minor.
# e.g. cpld_ver_raw = 0x09 => major_hex = 0, minor_hex = 9
read_and_check_i2c_get ${CPLD_I2C_BUS_NUM} ${CPLD_I2C_BUS_ADDR} ${CPLD_I2C_BASEVER_REG} ||
return
local cpld_ver
((cpld_ver = byte_val))
((cpld_ver_major = cpld_ver >> 4))
((cpld_ver_minor = cpld_ver & 0xf))
((cpld_point = 0))
((cpld_subpoint = 0))
return 0
}
main() {
local cpld_ver_major
local cpld_ver_minor
local cpld_point
local cpld_subpoint
parse_cpld_ver || return
# Write CPLD version to file.
cpld_ver="${cpld_ver_major}.${cpld_ver_minor}.${cpld_point}.${cpld_subpoint}"
echo "CPLD version ${cpld_ver}"
echo "${cpld_ver}" > "${VER_ENV_FILE}"
return 0
}
# Exit without running main() if sourced
return 0 2>/dev/null
main "$@"
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