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#!/vendor/bin/sh
#
# edge_sense_init.sh [<power chip name>] [<power gpio number>]
#
# Initialize Edge Sense. If needed, power it up using the power controller chip
# specified by [<power chip name>] and power GPIO specified by
# [<power gpio number>].
#
# [<power chip name>] Name of chip (e.g., "pm8998") controlling Edge Sense
# power.
# [<power gpio number>] GPIO number controlling Edge Sens power (e.g., 2).
#
# [<power chip name>] and [<power gpio number>] default to values appropriate
# for the type and version of device.
#
# TODO: b/67205273
# The Edge Sense should only be powered up when it's in use.
# Ideally, this would be done in the Edge Sense SLPI driver, but it
# doesn't have direct access to the PM8998 GPIOs.
# As an alternative, the Elmyra Edge Sense sensor HAL driver could power
# up the Edge Sense or act as a GPIO proxy for the SLPI driver.
#
# Check for default values.
if [ "${#}" -eq 0 ]; then
use_defaults=1
else
use_defaults=0
fi
# Get the program name.
prog_name=$(basename ${0})
# Read the power chip name.
chip_name=${1}
# Read the power gpio number.
gpio_num=${2}
# Get the hardware platform and platform version.
hw_platform=`cat /sys/devices/soc0/hw_platform`
platform_version=`cat /sys/devices/soc0/platform_version`
# If using default values, check if platform needs Edge Sense to be initialized.
if [ ${use_defaults} -ne 0 ]; then
if [ "${hw_platform}" != "OEM" ] || \
[ "${platform_version}" == "65538" ]; then
log -t "${prog_name}" "Platform \"${hw_platform}\" version" \
"${platform_version} does not need Edge Sense to be initialized."
exit
fi
fi
# Set default values if using them.
if [ ${use_defaults} -ne 0 ]; then
chip_name=pm8998
gpio_num=2
fi
# Validate chip name and gpio number.
if [ -z ${chip_name} ]; then
log -t "${prog_name}" "Chip name not specified."
exit 1
fi
if [ -z ${gpio_num} ]; then
log -t "${prog_name}" "GPIO number not specified."
exit 1
fi
# Find the GPIO pin control device node for the power chip.
pinctrl=`find /sys/devices -name "*${chip_name}*pinctrl*"`
if [ -z ${pinctrl} ]; then
log -t "${prog_name}" "Power chip \"${chip_name}\" not found."
exit 1
fi
# Find the GPIO index within the chip GPIO interrupt name list. This will be
# the GPIO index offset from the chip GPIO index base.
found=0
gpio_name=gpio${gpio_num}
gpio_index_off=0
while IFS= read -d '' name; do
# Check for a match.
if [ "${name%${gpio_name}}" != "${name}" ]; then
found=1
break
fi
# Check next GPIO index.
gpio_index_off=$((${gpio_index_off} + 1))
done < ${pinctrl}/of_node/interrupt-names
if [ ${found} -eq 0 ]; then
log -t "${prog_name}" "GPIO ${gpio_num} on chip \"${chip_name}\" not found."
exit 1
fi
# Find the chip GPIO base index.
base_file=`find ${pinctrl} -name base`
gpio_index_base=`cat ${base_file}`
# Get the GPIO index.
gpio_index=$((${gpio_index_base} + ${gpio_index_off}))
# Export the GPIO.
echo ${gpio_index} > /sys/class/gpio/export
# Set the GPIO direction to out.
echo out > /sys/class/gpio/gpio${gpio_index}/direction
# Set the GPIO high.
echo 1 > /sys/class/gpio/gpio${gpio_index}/value
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