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#!/bin/bash
# Copyright 2019 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
. /usr/share/misc/shflags
DEFINE_boolean 'read' "${FLAGS_FALSE}" 'Read instead of write' 'r'
FLAGS_HELP="Usage: ${0} [flags] ec.bin"
# Process commandline flags
FLAGS "${@}" || exit 1
eval set -- "${FLAGS_ARGV}"
if [[ "$#" -eq 0 ]]; then
echo "Missing filename"
flags_help
exit 1
fi
# print out canonical path to differentiate between /usr/local/bin and
# /usr/bin installs
echo "$(readlink -f "$0")"
readonly CROS_EC_SPI_MODALIAS_STR="of:NcrfpTCgoogle,cros-ec-spi"
check_hardware_write_protect_disabled() {
local hardware_write_protect_state="$(crossystem wpsw_cur)"
if [[ "${hardware_write_protect_state}" != "0" ]]; then
echo "Please make sure hardware write protect is disabled."
echo "See https://www.chromium.org/chromium-os/firmware-porting-guide/firmware-ec-write-protection"
exit 1
fi
}
# Get the spiid for the fingerprint sensor based on the modalias
# string: https://crbug.com/955117
get_spiid() {
for dev in /sys/bus/spi/devices/*; do
if [[ "$(cat "${dev}/modalias")" == "${CROS_EC_SPI_MODALIAS_STR}" ]]; then
echo "$(basename "${dev}")"
exit 0
fi
done
exit 1
}
flash_fp_mcu_stm32() {
local spidev="${1}"
local gpio_nrst="${2}"
local gpio_boot0="${3}"
local gpio_pwren="${4}"
local file="${5}"
local spiid
local STM32MON_READ_FLAGS=" -U -u -p -s ${spidev} -r"
local STM32MON_WRITE_FLAGS="-U -u -p -s ${spidev} -e -w"
local stm32mon_flags=""
if [[ "${FLAGS_read}" -eq "${FLAGS_TRUE}" ]]; then
if [[ -e "${file}" ]]; then
echo "Output file already exists: ${file}"
exit 1
fi
stm32mon_flags="${STM32MON_READ_FLAGS}"
else
if [[ ! -f "${file}" ]]; then
echo "Invalid image file: ${file}"
exit 1
fi
stm32mon_flags="${STM32MON_WRITE_FLAGS}"
fi
check_hardware_write_protect_disabled
spiid="$(get_spiid)"
if [[ $? -ne 0 ]]; then
echo "Unable to find FP sensor SPI device: ${CROS_EC_SPI_MODALIAS_STR}"
exit 1
fi
echo "Flashing SPI device ID: ${spiid}"
# Ensure the ACPI is not cutting power when unloading cros-ec-spi
if [[ -n "${gpio_pwren}" ]]; then
echo "${gpio_pwren}" > /sys/class/gpio/export
echo "out" > "/sys/class/gpio/gpio${gpio_pwren}/direction"
echo 1 > "/sys/class/gpio/gpio${gpio_pwren}/value"
fi
# Remove cros_fp if present
echo "${spiid}" > /sys/bus/spi/drivers/cros-ec-spi/unbind
# Configure the MCU Boot0 and NRST GPIOs
echo "${gpio_boot0}" > /sys/class/gpio/export
echo "out" > "/sys/class/gpio/gpio${gpio_boot0}/direction"
echo "${gpio_nrst}" > /sys/class/gpio/export
echo "out" > "/sys/class/gpio/gpio${gpio_nrst}/direction"
# Reset sequence to enter bootloader mode
echo 1 > "/sys/class/gpio/gpio${gpio_boot0}/value"
echo 0 > "/sys/class/gpio/gpio${gpio_nrst}/value"
sleep 0.001
# load spidev (fail on cros-ec-spi first to change modalias)
echo "${spiid}" > /sys/bus/spi/drivers/cros-ec-spi/bind 2>/dev/null
echo "${spiid}" > /sys/bus/spi/drivers/spidev/bind
# Release reset as the SPI bus is now ready
echo 1 > "/sys/class/gpio/gpio${gpio_nrst}/value"
echo "in" > "/sys/class/gpio/gpio${gpio_nrst}/direction"
stm32mon ${stm32mon_flags} "${file}"
# unload spidev
echo "${spiid}" > /sys/bus/spi/drivers/spidev/unbind
# Go back to normal mode
echo "out" > "/sys/class/gpio/gpio${gpio_nrst}/direction"
echo 0 > "/sys/class/gpio/gpio${gpio_boot0}/value"
echo 0 > "/sys/class/gpio/gpio${gpio_nrst}/value"
echo 1 > "/sys/class/gpio/gpio${gpio_nrst}/value"
# Give up GPIO control
echo "in" > "/sys/class/gpio/gpio${gpio_boot0}/direction"
echo "in" > "/sys/class/gpio/gpio${gpio_nrst}/direction"
echo "${gpio_boot0}" > /sys/class/gpio/unexport
echo "${gpio_nrst}" > /sys/class/gpio/unexport
# wait for FP MCU to come back up (including RWSIG delay)
sleep 2
# Put back cros_fp driver
echo "${spiid}" > /sys/bus/spi/drivers/cros-ec-spi/bind
# Kernel driver is back, we are no longer controlling power
if [[ -n "${gpio_pwren}" ]]; then
echo "${gpio_pwren}" > /sys/class/gpio/unexport
fi
# Test it
ectool --name=cros_fp version
}
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