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#!/bin/bash
# Copyright 2020 Google LLC
# Copyright 2020 Quanta Computer Inc.
#
# 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.
#
# Common GPIO functions.
# Map names of GPIOs to GPIO number
declare -A GPIO_NAMES_TO_NUMBER=(
['RST_BMC_PHY_N']=15
['BMC_BRD_REV_ID6']=37
['BMC_BRD_REV_ID5']=38
['BMC_BRD_SKU_ID3']=39
['BMC_BRD_SKU_ID2']=40
['FM_BMC_CPU_UART_EN']=76
['RST_BMC_RSMRST_N']=87
['RST_KBRST_BMC_CPLD_N']=94
['FAN_BRD_REV_ID0']=122
['FAN_BRD_REV_ID1']=123
['HSBP_BRD_REV_ID3']=124
['HSBP_BRD_REV_ID2']=125
['HSBP_BRD_REV_ID1']=126
['BMC_BRD_REV_ID0']=136
['BMC_BRD_REV_ID1']=137
['BMC_BRD_REV_ID2']=138
['BMC_BRD_REV_ID3']=139
['BMC_BRD_REV_ID4']=140
['BMC_BRD_SKU_ID0']=141
['BMC_BRD_SKU_ID1']=142
['HDD_PRSNT_N']=160
['SPI_SW_SELECT']=169
['BMC_BRD_REV_ID7']=194
['HSBP_BRD_REV_ID0']=196
)
# 1 is active_low 0 is active_high
declare -A GPIO_NAMES_TO_ACTIVE_LOW=(
['RST_BMC_PHY_N']=1
['BMC_BRD_REV_ID6']=0
['BMC_BRD_REV_ID5']=0
['BMC_BRD_SKU_ID3']=0
['BMC_BRD_SKU_ID2']=0
['FM_BMC_CPU_UART_EN']=0
['RST_BMC_RSMRST_N']=1
['RST_KBRST_BMC_CPLD_N']=1
['FAN_BRD_REV_ID0']=0
['FAN_BRD_REV_ID1']=0
['HSBP_BRD_REV_ID3']=0
['HSBP_BRD_REV_ID2']=0
['HSBP_BRD_REV_ID1']=0
['BMC_BRD_REV_ID0']=0
['BMC_BRD_REV_ID1']=0
['BMC_BRD_REV_ID2']=0
['BMC_BRD_REV_ID3']=0
['BMC_BRD_REV_ID4']=0
['BMC_BRD_SKU_ID0']=0
['BMC_BRD_SKU_ID1']=0
['HDD_PRSNT_N']=1
['SPI_SW_SELECT']=0
['BMC_BRD_REV_ID7']=0
['HSBP_BRD_REV_ID0']=0
)
##################################################
# Initializes the gpio state
# This operation is idempotent and can be applied
# repeatedly to the same gpio. It will make sure the
# gpio ends up in the initialized state even if it
# was.
# Arguments:
# $1: GPIO name
# Return:
# 0 if success, non-zero if error
##################################################
init_gpio() {
if (( $# != 1 )); then
echo "Usage: init_gpio name" >&2
return 1
fi
local name=$1
local number=${GPIO_NAMES_TO_NUMBER["${name}"]}
if [[ -z ${number} ]]; then
echo "Missing number info for: ${name}" >&2
return 2
fi
local active_low=${GPIO_NAMES_TO_ACTIVE_LOW["${name}"]}
if [[ -z ${active_low} ]]; then
echo "Missing active_low info for: ${name}" >&2
return 2
fi
if [[ ! -e "/sys/class/gpio/gpio${number}" ]]; then
echo "${number}" >'/sys/class/gpio/export'
fi
echo "${active_low}" >"/sys/class/gpio/gpio${number}/active_low"
}
##################################################
# Set output GPIO direction.
# Arguments:
# $1: GPIO name
# $2: GPIO direction, "high" or "low"
# Return:
# 0 if success, non-zero if error
##################################################
set_gpio_direction() {
if (( $# != 2 )); then
echo 'Usage: set_gpio_direction name direction' >&2
return 1
fi
local name=$1
local direction=$2
local number=${GPIO_NAMES_TO_NUMBER["${name}"]}
if [[ -z ${number} ]]; then
echo "Missing number info for: ${name}" >&2
return 2
fi
init_gpio "${name}" || return
echo "${direction}" >"/sys/class/gpio/gpio${number}/direction"
echo "Set gpio ${name} #${number} to direction ${direction}" >&2
}
##################################################
# Get GPIO value
# Arguments:
# $1: GPIO name
# Return:
# 0 if success, non-zero if error
# stdout: The value of the gpio
##################################################
get_gpio_value() {
if (( $# != 1 )); then
echo 'Usage: get_gpio_value name' >&2
return 1
fi
local name=$1
local number=${GPIO_NAMES_TO_NUMBER["${name}"]}
if [[ -z ${number} ]]; then
echo "Missing number info for: ${name}" >&2
return 2
fi
init_gpio "${name}" || return
cat "/sys/class/gpio/gpio${number}/value"
}
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