Add EdgeSense LDO power initialization.

Bug: 68950393
Test: Verified that the Max11259 sensor is being enumerated and works.  See
details in testing done comment in
https://googleplex-android-review.git.corp.google.com/3175117 .
Change-Id: Id7cacdbae1f85b0c06dd193cca990271631ab0b2

1 files changed, 113 insertions, 0 deletions

diff --git a/init.edge_sense.sh b/init.edge_sense.sh
new file mode 100644
index 00000000..8c3d9ce0
--- /dev/null
+++ b/init.edge_sense.sh
@@ -0,0 +1,113 @@
+#!/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
+
+