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104 lines
2.8 KiB
104 lines
2.8 KiB
4 months ago
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#!/vendor/bin/sh
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#
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# edge_sense_init.sh [<power chip name>] [<power gpio number>]
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#
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# Initialize Edge Sense. If needed, power it up using the power controller chip
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# specified by [<power chip name>] and power GPIO specified by
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# [<power gpio number>].
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#
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# [<power chip name>] Name of chip (e.g., "pm8998") controlling Edge Sense
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# power.
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# [<power gpio number>] GPIO number controlling Edge Sens power (e.g., 2).
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#
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# [<power chip name>] and [<power gpio number>] default to values appropriate
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# for the type and version of device.
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#
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# TODO: b/67205273
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# The Edge Sense should only be powered up when it's in use.
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# Ideally, this would be done in the Edge Sense SLPI driver, but it
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# doesn't have direct access to the PM8998 GPIOs.
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# As an alternative, the Elmyra Edge Sense sensor HAL driver could power
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# up the Edge Sense or act as a GPIO proxy for the SLPI driver.
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#
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# Check for default values.
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if [ "${#}" -eq 0 ]; then
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use_defaults=1
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else
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use_defaults=0
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fi
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# Get the program name.
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prog_name=$(basename ${0})
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# Read the power chip name.
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chip_name=${1}
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# Read the power gpio number.
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gpio_num=${2}
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# Get the hardware platform and platform version.
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hw_platform=`cat /sys/devices/soc0/hw_platform`
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platform_version=`cat /sys/devices/soc0/platform_version`
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# Set default values if using them.
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if [ ${use_defaults} -ne 0 ]; then
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chip_name=pm660@
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gpio_num=3
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fi
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# Validate chip name and gpio number.
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if [ -z ${chip_name} ]; then
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log -t "${prog_name}" "Chip name not specified."
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exit 1
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fi
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if [ -z ${gpio_num} ]; then
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log -t "${prog_name}" "GPIO number not specified."
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exit 1
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fi
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# Find the GPIO pin control device node for the power chip.
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pinctrl=`find /sys/devices -name "*${chip_name}*pinctrl*"`
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if [ -z ${pinctrl} ]; then
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log -t "${prog_name}" "Power chip \"${chip_name}\" not found."
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exit 1
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fi
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# Find the GPIO index within the chip GPIO interrupt name list. This will be
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# the GPIO index offset from the chip GPIO index base.
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found=0
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gpio_name=gpio${gpio_num}
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gpio_index_off=0
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while IFS= read -d '' name; do
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# Check for a match.
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if [ "${name%${gpio_name}}" != "${name}" ]; then
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found=1
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break
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fi
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# Check next GPIO index.
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gpio_index_off=$((${gpio_index_off} + 1))
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done < ${pinctrl}/of_node/interrupt-names
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if [ ${found} -eq 0 ]; then
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log -t "${prog_name}" "GPIO ${gpio_num} on chip \"${chip_name}\" not found."
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exit 1
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fi
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# Find the chip GPIO base index.
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base_file=`find ${pinctrl} -name base`
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gpio_index_base=`cat ${base_file}`
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# Get the GPIO index.
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gpio_index=$((${gpio_index_base} + ${gpio_index_off}))
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# Export the GPIO.
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echo ${gpio_index} > /sys/class/gpio/export
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# Set the GPIO direction to out.
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echo out > /sys/class/gpio/gpio${gpio_index}/direction
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# Set the GPIO high.
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echo 1 > /sys/class/gpio/gpio${gpio_index}/value
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