payload_utils/cros_config_proto_converter.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2020 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.
"""Transforms config from /config/proto/api proto format to platform JSON."""

# pylint: disable=too-many-lines

import argparse
import json
import pprint
import os
import sys
import re

from typing import List

from collections import namedtuple

from google.protobuf import json_format
from lxml import etree

from chromiumos.config.api import device_brand_pb2
from chromiumos.config.api import topology_pb2
from chromiumos.config.payload import config_bundle_pb2
from chromiumos.config.api.software import brand_config_pb2

Config = namedtuple('Config', [
    'program', 'hw_design', 'odm', 'hw_design_config', 'device_brand',
    'device_signer_config', 'oem', 'sw_config', 'brand_config'
])

ConfigFiles = namedtuple('ConfigFiles', [
    'arc_hw_features', 'arc_media_profiles', 'touch_fw', 'dptf_map',
    'camera_map', 'wifi_sar_map'
])

CAMERA_CONFIG_DEST_PATH_TEMPLATE = '/etc/camera/camera_config_{}.json'
CAMERA_CONFIG_SOURCE_PATH_TEMPLATE = (
    'sw_build_config/platform/chromeos-config/camera/camera_config_{}.json')

DPTF_PATH = 'sw_build_config/platform/chromeos-config/thermal'
DPTF_FILE = 'dptf.dv'

TOUCH_PATH = 'sw_build_config/platform/chromeos-config/touch'
WALLPAPER_BASE_PATH = '/usr/share/chromeos-assets/wallpaper'

XML_DECLARATION = b'<?xml version="1.0" encoding="utf-8"?>\n'


def parse_args(argv):
  """Parse the available arguments.

  Invalid arguments or -h cause this function to print a message and exit.

  Args:
    argv: List of string arguments (excluding program name / argv[0])

  Returns:
    argparse.Namespace object containing the attributes.
  """
  parser = argparse.ArgumentParser(
      description='Converts source proto config into platform JSON config.')
  parser.add_argument(
      '-c',
      '--project_configs',
      nargs='+',
      type=str,
      help='Space delimited list of source protobinary project config files.')
  parser.add_argument(
      '-p',
      '--program_config',
      type=str,
      help='Path to the source program-level protobinary file')
  parser.add_argument(
      '-o', '--output', type=str, help='Output file that will be generated')
  return parser.parse_args(argv)


def _upsert(field, target, target_name):
  """Updates or inserts `field` within `target`.

  If `target_name` already exists within `target` an update is performed,
  otherwise, an insert is performed.
  """
  if field or field == 0:
    if target_name in target:
      target[target_name].update(field)
    else:
      target[target_name] = field


def _build_arc(config, config_files):
  build_properties = {
      # TODO(chromium:1126527) - Push this into the overlay itself.
      # This isn't/can't be device specific and shouldn't be configured as such.
      'device': "%s_cheets" % config.program.name.lower(),
      'first-api-level': '28',
      'marketing-name': config.device_brand.brand_name,
      'metrics-tag': config.hw_design.name.lower(),
      'product': config.program.name.lower(),
  }
  if config.oem:
    build_properties['oem'] = config.oem.name
  result = {'build-properties': build_properties}
  config_id = _get_formatted_config_id(config.hw_design_config)
  if config_id in config_files.arc_hw_features:
    result['hardware-features'] = config_files.arc_hw_features[config_id]
  if config_id in config_files.arc_media_profiles:
    result['media-profiles'] = config_files.arc_media_profiles[config_id]
  topology = config.hw_design_config.hardware_topology
  ppi = topology.screen.hardware_feature.screen.panel_properties.pixels_per_in
  # Only set for high resolution displays
  if ppi and ppi > 250:
    result['scale'] = ppi

  return result


def _build_ash_flags(config: Config) -> List[str]:
  """Returns a list of Ash flags for config.

  Ash is the window manager and system UI for ChromeOS, see
  https://chromium.googlesource.com/chromium/src/+/refs/heads/master/ash/.
  """
  # A map from flag name -> value. Value may be None for boolean flags.
  flags = {}

  hw_features = config.hw_design_config.hardware_features
  if hw_features.stylus.stylus == topology_pb2.HardwareFeatures.Stylus.INTERNAL:
    flags['has-internal-stylus'] = None

  fp_loc = hw_features.fingerprint.location
  if fp_loc and fp_loc != topology_pb2.HardwareFeatures.Fingerprint.NOT_PRESENT:
    loc_name = topology_pb2.HardwareFeatures.Fingerprint.Location.Name(fp_loc)
    flags['fingerprint-sensor-location'] = loc_name.lower().replace('_', '-')

  wallpaper = config.brand_config.wallpaper
  # If a wallpaper is set, the 'default-wallpaper-is-oem' flag needs to be set.
  # If a wallpaper is not set, the 'default_[large|small].jpg' wallpapers
  # should still be set.
  if wallpaper:
    flags['default-wallpaper-is-oem'] = None
  else:
    wallpaper = 'default'

  for size in ('small', 'large'):
    flags[f'default-wallpaper-{size}'] = (
        f'{WALLPAPER_BASE_PATH}/{wallpaper}_{size}.jpg')

    # For each size, also install 'guest' and 'child' wallpapers.
    for wallpaper_type in ('guest', 'child'):
      flags[f'{wallpaper_type}-wallpaper-{size}'] = (
          f'{WALLPAPER_BASE_PATH}/{wallpaper_type}_{size}.jpg')

  regulatory_label = config.brand_config.regulatory_label
  if regulatory_label:
    flags['regulatory-label-dir'] = (regulatory_label)

  flags['arc-build-properties'] = {
      'device': "%s_cheets" % config.program.name.lower(),
      'firstApiLevel': '28',
  }

  power_button = hw_features.power_button
  if power_button.edge:
    flags['ash-power-button-position'] = json.dumps({
        'edge':
            topology_pb2.HardwareFeatures.Button.Edge.Name(power_button.edge
                                                          ).lower(),
        # Starlark sometimes represents float literals strangely, e.g. changing
        # 0.9 to 0.899999. Round to two digits here.
        'position':
            round(power_button.position, 2)
    })

  volume_button = hw_features.volume_button
  if volume_button.edge:
    flags['ash-side-volume-button-position'] = json.dumps({
        'region':
            topology_pb2.HardwareFeatures.Button.Region.Name(
                volume_button.region).lower(),
        'edge':
            topology_pb2.HardwareFeatures.Button.Edge.Name(volume_button.edge
                                                          ).lower(),
    })

  form_factor = hw_features.form_factor.form_factor
  lid_accel = hw_features.accelerometer.lid_accelerometer
  if (form_factor == topology_pb2.HardwareFeatures.FormFactor.CHROMEBASE and
      lid_accel == topology_pb2.HardwareFeatures.PRESENT):
    flags['force-in-tablet-physical-state'] = None

  return sorted([f'--{k}={v}' if v else f'--{k}' for k, v in flags.items()])


def _build_ui(config: Config) -> dict:
  """Builds the 'ui' property from cros_config_schema."""
  return {'extra-ash-flags': _build_ash_flags(config)}


def _build_bluetooth(config):
  bt_flags = config.sw_config.bluetooth_config.flags
  # Convert to native map (from proto wrapper)
  bt_flags_map = dict(bt_flags)
  result = {}
  if bt_flags_map:
    result['flags'] = bt_flags_map
  return result


def _build_ath10k_config(ath10k_config):
  """Builds the wifi configuration for the ath10k driver.

  Args:
    ath10k_config: Ath10kConfig config.

  Returns:
    wifi configuration for the ath10k driver.
  """
  result = {}

  def power_chain(power):
    return {
        'limit-2g': power.limit_2g,
        'limit-5g': power.limit_5g,
    }

  result['tablet-mode-power-table-ath10k'] = power_chain(
      ath10k_config.tablet_mode_power_table)
  result['non-tablet-mode-power-table-ath10k'] = power_chain(
      ath10k_config.non_tablet_mode_power_table)
  return result


def _build_rtw88_config(rtw88_config):
  """Builds the wifi configuration for the rtw88 driver.

  Args:
    rtw88_config: Rtw88Config config.

  Returns:
    wifi configuration for the rtw88 driver.
  """
  result = {}

  def power_chain(power):
    return {
        'limit-2g': power.limit_2g,
        'limit-5g-1': power.limit_5g_1,
        'limit-5g-3': power.limit_5g_3,
        'limit-5g-4': power.limit_5g_4,
    }

  result['tablet-mode-power-table-rtw'] = power_chain(
      rtw88_config.tablet_mode_power_table)
  result['non-tablet-mode-power-table-rtw'] = power_chain(
      rtw88_config.non_tablet_mode_power_table)

  def offsets(offset):
    return {
        'offset-2g': offset.offset_2g,
        'offset-5g': offset.offset_5g,
    }

  result['geo-offsets-fcc'] = offsets(rtw88_config.offset_fcc)
  result['geo-offsets-eu'] = offsets(rtw88_config.offset_eu)
  result['geo-offsets-rest-of-world'] = offsets(rtw88_config.offset_other)
  return result


def _build_intel_config(config, config_files):
  """Builds the wifi configuration for the intel driver.

  Args:
    config: Config namedtuple
    config_files: Map to look up the generated config files.

  Returns:
    wifi configuration for the intel driver.
  """
  design_name = config.hw_design.name.lower()
  return config_files.wifi_sar_map.get(design_name)


def _build_wifi(config, config_files):
  """Builds the wifi configuration.

  Args:
    config: Config namedtuple
    config_files: Map to look up the generated config files.

  Returns:
    wifi configuration.
  """
  config_field = config.sw_config.wifi_config.WhichOneof('wifi_config')
  if config_field == 'ath10k_config':
    return _build_ath10k_config(config.sw_config.wifi_config.ath10k_config)
  if config_field == 'rtw88_config':
    return _build_rtw88_config(config.sw_config.wifi_config.rtw88_config)
  if config_field == 'intel_config':
    return _build_intel_config(config, config_files)
  return {}


def _build_fingerprint(hw_topology):
  if not hw_topology.HasField('fingerprint'):
    return None

  fp = hw_topology.fingerprint.hardware_feature.fingerprint
  result = {}
  if fp.location != topology_pb2.HardwareFeatures.Fingerprint.NOT_PRESENT:
    location = fp.Location.DESCRIPTOR.values_by_number[fp.location].name
    result['sensor-location'] = location.lower().replace('_', '-')
    if fp.board:
      result['board'] = fp.board
    if fp.ro_version:
      result['ro-version'] = fp.ro_version

  return result


def _build_hardware_properties(hw_topology):
  if not hw_topology.HasField('form_factor'):
    return None

  form_factor = hw_topology.form_factor.hardware_feature.form_factor.form_factor
  result = {}
  if form_factor in [
      topology_pb2.HardwareFeatures.FormFactor.CHROMEBIT,
      topology_pb2.HardwareFeatures.FormFactor.CHROMEBASE,
      topology_pb2.HardwareFeatures.FormFactor.CHROMEBOX
  ]:
    result['psu-type'] = "AC_only"
  else:
    result['psu-type'] = "battery"

  result['has-backlight'] = form_factor not in [
      topology_pb2.HardwareFeatures.FormFactor.CHROMEBIT,
      topology_pb2.HardwareFeatures.FormFactor.CHROMEBOX
  ]

  form_factor_names = {
      topology_pb2.HardwareFeatures.FormFactor.CHROMEBASE: "CHROMEBASE",
  }
  if form_factor in form_factor_names:
    result['form-factor'] = form_factor_names[form_factor]

  return result


def _fw_bcs_path(payload):
  if payload and payload.firmware_image_name:
    return 'bcs://%s.%d.%d.%d.tbz2' % (
        payload.firmware_image_name, payload.version.major,
        payload.version.minor, payload.version.patch)

  return None


def _fw_build_target(payload):
  if payload:
    return payload.build_target_name

  return None


def _build_firmware(config):
  """Returns firmware config, or None if no build targets."""
  fw_payload_config = config.sw_config.firmware
  fw_build_config = config.sw_config.firmware_build_config
  main_ro = fw_payload_config.main_ro_payload
  main_rw = fw_payload_config.main_rw_payload
  ec_ro = fw_payload_config.ec_ro_payload
  pd_ro = fw_payload_config.pd_ro_payload

  build_targets = {}

  _upsert(fw_build_config.build_targets.depthcharge, build_targets,
          'depthcharge')
  _upsert(fw_build_config.build_targets.coreboot, build_targets, 'coreboot')
  _upsert(fw_build_config.build_targets.ec, build_targets, 'ec')
  _upsert(
      list(fw_build_config.build_targets.ec_extras), build_targets, 'ec_extras')
  _upsert(fw_build_config.build_targets.libpayload, build_targets, 'libpayload')

  if not build_targets:
    return None

  result = {
      'bcs-overlay': 'overlay-%s-private' % config.program.name.lower(),
      'build-targets': build_targets,
  }

  _upsert(main_ro.firmware_image_name.lower(), result, 'image-name')

  _upsert(_fw_bcs_path(main_ro), result, 'main-ro-image')
  _upsert(_fw_bcs_path(main_rw), result, 'main-rw-image')
  _upsert(_fw_bcs_path(ec_ro), result, 'ec-ro-image')
  _upsert(_fw_bcs_path(pd_ro), result, 'pd-ro-image')

  _upsert(
      config.hw_design_config.hardware_features.fw_config.value,
      result,
      'firmware-config',
  )

  return result


def _build_fw_signing(config, whitelabel):
  if config.sw_config.firmware and config.device_signer_config:
    hw_design = config.hw_design.name.lower()
    brand_scan_config = config.brand_config.scan_config
    if brand_scan_config and brand_scan_config.whitelabel_tag:
      signature_id = '%s-%s' % (hw_design, brand_scan_config.whitelabel_tag)
    else:
      signature_id = hw_design

    result = {
        'key-id': config.device_signer_config.key_id,
        'signature-id': signature_id,
    }
    if whitelabel:
      result['sig-id-in-customization-id'] = True
    return result
  return {}


def _file(source, destination):
  return {'destination': destination, 'source': source}


def _file_v2(build_path, system_path):
  return {'build-path': build_path, 'system-path': system_path}


def _build_audio(config):
  if not config.sw_config.audio_configs:
    return {}
  alsa_path = '/usr/share/alsa/ucm'
  cras_path = '/etc/cras'
  sound_card_init_path = '/etc/sound_card_init'
  project_name = config.hw_design.name.lower()
  program_name = config.program.name.lower()
  files = []
  ucm_suffix = None
  for audio in config.sw_config.audio_configs:
    card = audio.card_name
    card_with_suffix = audio.card_name
    if audio.ucm_suffix:
      # TODO: last ucm_suffix wins.
      ucm_suffix = audio.ucm_suffix
      card_with_suffix += '.' + audio.ucm_suffix
    if audio.ucm_file:
      files.append(
          _file(audio.ucm_file,
                '%s/%s/HiFi.conf' % (alsa_path, card_with_suffix)))
    if audio.ucm_master_file:
      files.append(
          _file(
              audio.ucm_master_file, '%s/%s/%s.conf' %
              (alsa_path, card_with_suffix, card_with_suffix)))
    if audio.card_config_file:
      files.append(
          _file(audio.card_config_file,
                '%s/%s/%s' % (cras_path, project_name, card)))
    if audio.dsp_file:
      files.append(
          _file(audio.dsp_file, '%s/%s/dsp.ini' % (cras_path, project_name)))
    if audio.module_file:
      files.append(
          _file(audio.module_file,
                '/etc/modprobe.d/alsa-%s.conf' % program_name))
    if audio.board_file:
      files.append(
          _file(audio.board_file,
                '%s/%s/board.ini' % (cras_path, project_name)))
    if audio.sound_card_init_file:
      files.append(
          _file(audio.sound_card_init_file,
                '%s/%s.yaml' % (sound_card_init_path, audio.card_id)))

  result = {
      'main': {
          'cras-config-dir': project_name,
          'files': files,
      }
  }

  if ucm_suffix:
    result['main']['ucm-suffix'] = ucm_suffix

  return result


def _build_camera(hw_topology):
  camera_pb = topology_pb2.HardwareFeatures.Camera
  camera = hw_topology.camera.hardware_feature.camera
  result = {'count': len(camera.devices)}
  if camera.devices:
    result['devices'] = []
    for device in camera.devices:
      interface = {
          camera_pb.INTERFACE_USB: 'usb',
          camera_pb.INTERFACE_MIPI: 'mipi',
      }[device.interface]
      facing = {
          camera_pb.FACING_FRONT: 'front',
          camera_pb.FACING_BACK: 'back',
      }[device.facing]
      orientation = {
          camera_pb.ORIENTATION_0: 0,
          camera_pb.ORIENTATION_90: 90,
          camera_pb.ORIENTATION_180: 180,
          camera_pb.ORIENTATION_270: 270,
      }[device.orientation]
      flags = {
          'support-1080p':
              bool(device.flags & camera_pb.FLAGS_SUPPORT_1080P),
          'support-autofocus':
              bool(device.flags & camera_pb.FLAGS_SUPPORT_AUTOFOCUS),
      }
      dev = {
          'interface': interface,
          'facing': facing,
          'orientation': orientation,
          'flags': flags,
          'ids': list(device.ids),
      }
      if device.privacy_switch != topology_pb2.HardwareFeatures.PRESENT_UNKNOWN:
        dev['has-privacy-switch'] = device.privacy_switch == topology_pb2.HardwareFeatures.PRESENT
      result['devices'].append(dev)
  return result


def _build_identity(hw_scan_config, program, brand_scan_config=None):
  identity = {}
  _upsert(hw_scan_config.firmware_sku, identity, 'sku-id')
  _upsert(hw_scan_config.smbios_name_match, identity, 'smbios-name-match')
  # 'platform-name' is needed to support 'mosys platform name'. Clients should
  # no longer require platform name, but set it here for backwards compatibility.
  if program.mosys_platform_name:
    _upsert(program.mosys_platform_name, identity, 'platform-name')
  else:
    _upsert(program.name, identity, 'platform-name')

  # ARM architecture
  _upsert(hw_scan_config.device_tree_compatible_match, identity,
          'device-tree-compatible-match')

  if brand_scan_config:
    _upsert(brand_scan_config.whitelabel_tag, identity, 'whitelabel-tag')

  return identity


def _lookup(id_value, id_map):
  if not id_value.value:
    return None

  key = id_value.value
  if key in id_map:
    return id_map[id_value.value]
  error = 'Failed to lookup %s with value: %s' % (
      id_value.__class__.__name__.replace('Id', ''), key)
  print(error)
  print('Check the config contents provided:')
  printer = pprint.PrettyPrinter(indent=4)
  printer.pprint(id_map)
  raise Exception(error)


def _build_touch_file_config(config, project_name):
  partners = {x.id.value: x for x in config.partner_list}
  files = []
  for comp in config.components:
    touch = comp.touchscreen
    # Everything is the same for Touch screen/pad, except different fields
    if comp.HasField('touchpad'):
      touch = comp.touchpad
    if touch.product_id:
      vendor = _lookup(comp.manufacturer_id, partners)
      if not vendor:
        raise Exception("Manufacturer must be set for touch device %s" %
                        comp.id.value)

      product_id = touch.product_id
      fw_version = touch.fw_version

      file_name = "%s_%s.bin" % (product_id, fw_version)
      fw_file_path = os.path.join(TOUCH_PATH, vendor.name, file_name)

      if not os.path.exists(fw_file_path):
        raise Exception("Touchscreen fw bin file doesn't exist at: %s" %
                        fw_file_path)

      touch_vendor = vendor.touch_vendor
      sym_link = touch_vendor.symlink_file_format.format(
          vendor_name=vendor.name,
          vendor_id=touch_vendor.vendor_id,
          product_id=product_id,
          fw_version=fw_version,
          product_series=touch.product_series)

      dest = "%s_%s" % (vendor.name, file_name)
      if touch_vendor.destination_file_format:
        dest = touch_vendor.destination_file_format.format(
            vendor_name=vendor.name,
            vendor_id=touch_vendor.vendor_id,
            product_id=product_id,
            fw_version=fw_version,
            product_series=touch.product_series)

      files.append({
          "destination": os.path.join("/opt/google/touch/firmware", dest),
          "source": os.path.join(project_name, fw_file_path),
          "symlink": os.path.join("/lib/firmware", sym_link),
      })

  result = {}
  _upsert(files, result, 'files')
  return result


def _build_modem(config):
  """Returns the cellular modem configuration, or None if absent."""
  hw_features = config.hw_design_config.hardware_features
  lte_support = _any_present([hw_features.lte.present])
  if not lte_support:
    return None
  return {'firmware-variant': config.hw_design.name.lower()}


def _sw_config(sw_configs, design_config_id):
  """Returns the correct software config for `design_config_id`.

  Returns the correct software config match for `design_config_id`. If no such
  config or multiple such configs are found an exception is raised.
  """
  sw_config_matches = [
      x for x in sw_configs if x.design_config_id.value == design_config_id
  ]
  if len(sw_config_matches) == 1:
    return sw_config_matches[0]
  if len(sw_config_matches) > 1:
    raise ValueError('Multiple software configs found for: %s' %
                     design_config_id)
  raise ValueError('Software config is required for: %s' % design_config_id)


def _is_whitelabel(brand_configs, device_brands):
  for device_brand in device_brands:
    if device_brand.id.value in brand_configs:
      brand_scan_config = brand_configs[device_brand.id.value].scan_config
      if brand_scan_config and brand_scan_config.whitelabel_tag:
        return True
  return False


def _transform_build_configs(config,
                             config_files=ConfigFiles({}, {}, {}, {}, {}, {})):
  # pylint: disable=too-many-locals,too-many-branches
  partners = {x.id.value: x for x in config.partner_list}
  programs = {x.id.value: x for x in config.program_list}
  sw_configs = list(config.software_configs)
  brand_configs = {x.brand_id.value: x for x in config.brand_configs}

  results = {}
  for hw_design in config.design_list:
    if config.device_brand_list:
      device_brands = [
          x for x in config.device_brand_list
          if x.design_id.value == hw_design.id.value
      ]
    else:
      device_brands = [device_brand_pb2.DeviceBrand()]

    whitelabel = _is_whitelabel(brand_configs, device_brands)

    for device_brand in device_brands:
      # Brand config can be empty since platform JSON config allows it
      brand_config = brand_config_pb2.BrandConfig()
      if device_brand.id.value in brand_configs:
        brand_config = brand_configs[device_brand.id.value]

      for hw_design_config in hw_design.configs:
        sw_config = _sw_config(sw_configs, hw_design_config.id.value)
        program = _lookup(hw_design.program_id, programs)
        signer_configs_by_design = {}
        signer_configs_by_brand = {}
        for signer_config in program.device_signer_configs:
          design_id = signer_config.design_id.value
          brand_id = signer_config.brand_id.value
          if design_id:
            signer_configs_by_design[design_id] = signer_config
          elif brand_id:
            signer_configs_by_brand[brand_id] = signer_config
          else:
            raise Exception('No ID found for signer config: %s' % signer_config)

        device_signer_config = None
        if signer_configs_by_design or signer_configs_by_brand:
          design_id = hw_design.id.value
          brand_id = device_brand.id.value
          if design_id in signer_configs_by_design:
            device_signer_config = signer_configs_by_design[design_id]
          elif brand_id in signer_configs_by_brand:
            device_signer_config = signer_configs_by_brand[brand_id]
          else:
            # Assume that if signer configs are set, every config is setup
            raise Exception('Signer config missing for design: %s, brand: %s' %
                            (design_id, brand_id))

        transformed_config = _transform_build_config(
            Config(
                program=program,
                hw_design=hw_design,
                odm=_lookup(hw_design.odm_id, partners),
                hw_design_config=hw_design_config,
                device_brand=device_brand,
                device_signer_config=device_signer_config,
                oem=_lookup(device_brand.oem_id, partners),
                sw_config=sw_config,
                brand_config=brand_config), config_files, whitelabel)

        config_json = json.dumps(
            transformed_config,
            sort_keys=True,
            indent=2,
            separators=(',', ': '))

        if config_json not in results:
          results[config_json] = transformed_config

  return list(results.values())


def _transform_build_config(config, config_files, whitelabel):
  """Transforms Config instance into target platform JSON schema.

  Args:
    config: Config namedtuple
    config_files: Map to look up the generated config files.
    whitelabel: Whether the config is for a whitelabel design

  Returns:
    Unique config payload based on the platform JSON schema.
  """
  result = {
      'identity':
          _build_identity(config.sw_config.id_scan_config, config.program,
                          config.brand_config.scan_config),
      'name':
          config.hw_design.name.lower(),
  }

  _upsert(_build_arc(config, config_files), result, 'arc')
  _upsert(_build_audio(config), result, 'audio')
  _upsert(_build_bluetooth(config), result, 'bluetooth')
  _upsert(_build_wifi(config, config_files), result, 'wifi')
  _upsert(config.brand_config.wallpaper, result, 'wallpaper')
  _upsert(config.brand_config.regulatory_label, result, 'regulatory-label')
  _upsert(config.device_brand.brand_code, result, 'brand-code')
  _upsert(
      _build_camera(config.hw_design_config.hardware_topology), result,
      'camera')
  _upsert(_build_firmware(config), result, 'firmware')
  _upsert(_build_fw_signing(config, whitelabel), result, 'firmware-signing')
  _upsert(
      _build_fingerprint(config.hw_design_config.hardware_topology), result,
      'fingerprint')
  _upsert(_build_ui(config), result, 'ui')
  power_prefs = config.sw_config.power_config.preferences
  power_prefs_map = dict(
      (x.replace('_', '-'), power_prefs[x]) for x in power_prefs)
  _upsert(power_prefs_map, result, 'power')
  if config_files.camera_map:
    camera_file = config_files.camera_map.get(config.hw_design.name, {})
    _upsert(camera_file, result, 'camera')
  if config_files.dptf_map:
    # Prefer design specific if found, if not fall back to project wide config
    # mapped under the empty string.
    if config_files.dptf_map.get(config.hw_design.name):
      dptf_file = config_files.dptf_map[config.hw_design.name]
    else:
      dptf_file = config_files.dptf_map.get('')
    _upsert(dptf_file, result, 'thermal')
  _upsert(config_files.touch_fw, result, 'touch')
  _upsert(
      _build_hardware_properties(config.hw_design_config.hardware_topology),
      result, 'hardware-properties')
  _upsert(_build_modem(config), result, 'modem')

  return result


def write_output(configs, output=None):
  """Writes a list of configs to platform JSON format.

  Args:
    configs: List of config dicts defined in cros_config_schema.yaml
    output: Target file output (if None, prints to stdout)
  """
  json_output = json.dumps({'chromeos': {
      'configs': configs,
  }},
                           sort_keys=True,
                           indent=2,
                           separators=(',', ': '))
  if output:
    with open(output, 'w') as output_stream:
      # Using print function adds proper trailing newline.
      print(json_output, file=output_stream)
  else:
    print(json_output)


def _feature(name, present):
  attrib = {'name': name}
  if present:
    return etree.Element('feature', attrib=attrib)

  return etree.Element('unavailable-feature', attrib=attrib)


def _any_present(features):
  return topology_pb2.HardwareFeatures.PRESENT in features


def _get_formatted_config_id(design_config):
  return design_config.id.value.lower().replace(':', '_')


def _write_file(output_dir, file_name, file_content):
  os.makedirs(output_dir, exist_ok=True)
  output = '{}/{}'.format(output_dir, file_name)
  with open(output, 'wb') as f:
    f.write(file_content)


def _get_arc_camera_features(camera):
  """Gets camera related features for ARC hardware_features.xml from camera
  topology. Check
  https://developer.android.com/reference/android/content/pm/PackageManager#FEATURE_CAMERA
  and CTS android.app.cts.SystemFeaturesTest#testCameraFeatures for the correct
  settings.

  Args:
    camera: A HardwareFeatures.Camera proto message.
  Returns:
    list of camera related ARC features as XML elements.
  """
  camera_pb = topology_pb2.HardwareFeatures.Camera

  count = len(camera.devices)
  has_front_camera = any(
      (d.facing == camera_pb.FACING_FRONT for d in camera.devices))
  has_back_camera = any(
      (d.facing == camera_pb.FACING_BACK for d in camera.devices))
  has_autofocus_back_camera = any((d.facing == camera_pb.FACING_BACK and
                                   d.flags & camera_pb.FLAGS_SUPPORT_AUTOFOCUS
                                   for d in camera.devices))
  # Assumes MIPI cameras support FULL-level.
  # TODO(kamesan): Setting this in project configs when there's an exception.
  has_level_full_camera = any(
      (d.interface == camera_pb.INTERFACE_MIPI for d in camera.devices))

  return [
      _feature('android.hardware.camera', has_back_camera),
      _feature('android.hardware.camera.any', count > 0),
      _feature('android.hardware.camera.autofocus', has_autofocus_back_camera),
      _feature('android.hardware.camera.capability.manual_post_processing',
               has_level_full_camera),
      _feature('android.hardware.camera.capability.manual_sensor',
               has_level_full_camera),
      _feature('android.hardware.camera.front', has_front_camera),
      _feature('android.hardware.camera.level.full', has_level_full_camera),
  ]


def _generate_arc_hardware_features(hw_features):
  """Generates ARC hardware_features.xml file content.

  Args:
    hw_features: HardwareFeatures proto message.
  Returns:
    bytes of the hardware_features.xml content.
  """
  touchscreen = _any_present([hw_features.screen.touch_support])
  acc = hw_features.accelerometer
  gyro = hw_features.gyroscope
  compass = hw_features.magnetometer
  light_sensor = hw_features.light_sensor
  root = etree.Element('permissions')
  root.extend(
      _get_arc_camera_features(hw_features.camera) + [
          _feature(
              'android.hardware.sensor.accelerometer',
              _any_present([acc.lid_accelerometer, acc.base_accelerometer])),
          _feature('android.hardware.sensor.gyroscope',
                   _any_present([gyro.lid_gyroscope, gyro.base_gyroscope])),
          _feature(
              'android.hardware.sensor.compass',
              _any_present(
                  [compass.lid_magnetometer, compass.base_magnetometer])),
          _feature(
              'android.hardware.sensor.light',
              _any_present([
                  light_sensor.lid_lightsensor, light_sensor.base_lightsensor
              ])),
          _feature('android.hardware.touchscreen', touchscreen),
          _feature('android.hardware.touchscreen.multitouch', touchscreen),
          _feature('android.hardware.touchscreen.multitouch.distinct',
                   touchscreen),
          _feature('android.hardware.touchscreen.multitouch.jazzhand',
                   touchscreen),
      ])
  return XML_DECLARATION + etree.tostring(root, pretty_print=True)


def _generate_arc_media_profiles(hw_features, sw_config):
  """Generates ARC media_profiles.xml file content.

  Args:
    hw_features: HardwareFeatures proto message.
    sw_config: SoftwareConfig proto message.
  Returns:
    bytes of the media_profiles.xml content, or None if |sw_config| disables the
    generation or there's no camera.
  """

  def _gen_camcorder_profiles(camera_id, resolutions):
    elem = etree.Element(
        'CamcorderProfiles', attrib={'cameraId': str(camera_id)})
    for width, height in resolutions:
      elem.extend([
          _gen_encoder_profile(width, height, False),
          _gen_encoder_profile(width, height, True),
      ])
    elem.extend([
        etree.Element('ImageEncoding', attrib={'quality': '90'}),
        etree.Element('ImageEncoding', attrib={'quality': '80'}),
        etree.Element('ImageEncoding', attrib={'quality': '70'}),
        etree.Element('ImageDecoding', attrib={'memCap': '20000000'}),
    ])
    return elem

  def _gen_encoder_profile(width, height, timelapse):
    elem = etree.Element(
        'EncoderProfile',
        attrib={
            'quality': ('timelapse' if timelapse else '') + str(height) + 'p',
            'fileFormat': 'mp4',
            'duration': '60',
        })
    elem.append(
        etree.Element(
            'Video',
            attrib={
                'codec': 'h264',
                'bitRate': '8000000',
                'width': str(width),
                'height': str(height),
                'frameRate': '30',
            }))
    elem.append(
        etree.Element(
            'Audio',
            attrib={
                'codec': 'aac',
                'bitRate': '96000',
                'sampleRate': '44100',
                'channels': '1',
            }))
    return elem

  def _gen_video_encoder_cap(name, min_bit_rate, max_bit_rate):
    return etree.Element(
        'VideoEncoderCap',
        attrib={
            'name': name,
            'enabled': 'true',
            'minBitRate': str(min_bit_rate),
            'maxBitRate': str(max_bit_rate),
            'minFrameWidth': '320',
            'maxFrameWidth': '1920',
            'minFrameHeight': '240',
            'maxFrameHeight': '1080',
            'minFrameRate': '15',
            'maxFrameRate': '30',
        })

  def _gen_audio_encoder_cap(name, min_bit_rate, max_bit_rate, min_sample_rate,
                             max_sample_rate):
    return etree.Element(
        'AudioEncoderCap',
        attrib={
            'name': name,
            'enabled': 'true',
            'minBitRate': str(min_bit_rate),
            'maxBitRate': str(max_bit_rate),
            'minSampleRate': str(min_sample_rate),
            'maxSampleRate': str(max_sample_rate),
            'minChannels': '1',
            'maxChannels': '1',
        })

  camera_config = sw_config.camera_config
  if not camera_config.generate_media_profiles:
    return None

  camera_pb = topology_pb2.HardwareFeatures.Camera
  root = etree.Element('MediaSettings')
  camera_id = 0
  for facing in [camera_pb.FACING_BACK, camera_pb.FACING_FRONT]:
    camera_device = next(
        (d for d in hw_features.camera.devices if d.facing == facing), None)
    if camera_device is None:
      continue
    if camera_config.camcorder_resolutions:
      resolutions = [
          (r.width, r.height) for r in camera_config.camcorder_resolutions
      ]
    else:
      resolutions = [(1280, 720)]
      if camera_device.flags & camera_pb.FLAGS_SUPPORT_1080P:
        resolutions.append((1920, 1080))
    root.append(_gen_camcorder_profiles(camera_id, resolutions))
    camera_id += 1
  # media_profiles.xml should have at least one CamcorderProfiles.
  if camera_id == 0:
    return None

  root.extend([
      etree.Element('EncoderOutputFileFormat', attrib={'name': '3gp'}),
      etree.Element('EncoderOutputFileFormat', attrib={'name': 'mp4'}),
      _gen_video_encoder_cap('h264', 64000, 17000000),
      _gen_video_encoder_cap('h263', 64000, 1000000),
      _gen_video_encoder_cap('m4v', 64000, 2000000),
      _gen_audio_encoder_cap('aac', 758, 288000, 8000, 48000),
      _gen_audio_encoder_cap('heaac', 8000, 64000, 16000, 48000),
      _gen_audio_encoder_cap('aaceld', 16000, 192000, 16000, 48000),
      _gen_audio_encoder_cap('amrwb', 6600, 23050, 16000, 16000),
      _gen_audio_encoder_cap('amrnb', 5525, 12200, 8000, 8000),
      etree.Element(
          'VideoDecoderCap', attrib={
              'name': 'wmv',
              'enabled': 'false'
          }),
      etree.Element(
          'AudioDecoderCap', attrib={
              'name': 'wma',
              'enabled': 'false'
          }),
  ])

  dtd_path = os.path.dirname(__file__)
  dtd = etree.DTD(os.path.join(dtd_path, 'media_profiles.dtd'))
  if not dtd.validate(root):
    raise etree.DTDValidateError(
        'Invalid media_profiles.xml generated:\n{}'.format(dtd.error_log))

  return XML_DECLARATION + etree.tostring(root, pretty_print=True)


def _write_files_by_design_config(configs, output_dir, build_dir, system_dir,
                                  file_name_template, generate_file_content):
  """Writes generated files for each design config.

  Args:
    configs: Source ConfigBundle to process.
    output_dir: Path to the generated output.
    build_dir: Path to the config file from portage's perspective.
    system_dir: Path to the config file in the target device.
    file_name_template: Template string of the config file name including one
      format()-style replacement field for the config id, e.g. 'config_{}.xml'.
    generate_file_content: Function to generate config file content from
      HardwareFeatures and SoftwareConfig proto.
  Returns:
    dict that maps the formatted config id to the correct file.
  """
  # pylint: disable=too-many-arguments,too-many-locals
  result = {}
  configs_by_design = {}
  for hw_design in configs.design_list:
    for design_config in hw_design.configs:
      sw_config = _sw_config(configs.software_configs, design_config.id.value)
      config_content = generate_file_content(design_config.hardware_features,
                                             sw_config)
      if not config_content:
        continue
      design_name = hw_design.name.lower()

      # Constructs the following map:
      # design_name -> config -> design_configs
      # This allows any of the following file naming schemes:
      # - All configs within a design share config (design_name prefix only)
      # - Nobody shares (full design_name and config id prefix needed)
      #
      # Having shared configs when possible makes code reviews easier around
      # the configs and makes debugging easier on the platform side.
      arc_configs = configs_by_design.get(design_name, {})
      design_configs = arc_configs.get(config_content, [])
      design_configs.append(design_config)
      arc_configs[config_content] = design_configs
      configs_by_design[design_name] = arc_configs

  for design_name, unique_configs in configs_by_design.items():
    for file_content, design_configs in unique_configs.items():
      file_name = file_name_template.format(design_name)
      if len(unique_configs) == 1:
        _write_file(output_dir, file_name, file_content)

      for design_config in design_configs:
        config_id = _get_formatted_config_id(design_config)
        if len(unique_configs) > 1:
          file_name = file_name_template.format(config_id)
          _write_file(output_dir, file_name, file_content)
        result[config_id] = _file_v2('{}/{}'.format(build_dir, file_name),
                                     '{}/{}'.format(system_dir, file_name))
  return result


def _write_arc_hardware_feature_files(configs, output_root_dir, build_root_dir):
  return _write_files_by_design_config(
      configs, output_root_dir + '/arc', build_root_dir + '/arc', '/etc',
      'hardware_features_{}.xml',
      lambda hw_features, _: _generate_arc_hardware_features(hw_features))


def _write_arc_media_profile_files(configs, output_root_dir, build_root_dir):
  return _write_files_by_design_config(configs, output_root_dir + '/arc',
                                       build_root_dir + '/arc', '/etc',
                                       'media_profiles_{}.xml',
                                       _generate_arc_media_profiles)


def _read_config(path):
  """Reads a ConfigBundle proto from a json pb file.

  Args:
    path: Path to the file encoding the json pb proto.
  """
  config = config_bundle_pb2.ConfigBundle()
  with open(path, 'r') as f:
    return json_format.Parse(f.read(), config)


def _merge_configs(configs):
  result = config_bundle_pb2.ConfigBundle()
  for config in configs:
    result.MergeFrom(config)

  return result


def _camera_map(configs, project_name):
  """Produces a camera config map for the given configs.

  Produces a map that maps from the design name to the camera config for that
  design.

  Args:
    configs: Source ConfigBundle to process.
    project_name: Name of project processing for.

  Returns:
    map from design name to camera config.
  """
  result = {}
  for design in configs.design_list:
    design_name = design.name
    config_path = CAMERA_CONFIG_SOURCE_PATH_TEMPLATE.format(design_name.lower())
    if os.path.exists(config_path):
      destination = CAMERA_CONFIG_DEST_PATH_TEMPLATE.format(design_name.lower())
      result[design_name] = {
          'config-file':
              _file_v2(os.path.join(project_name, config_path), destination),
      }
  return result


def _dptf_map(configs, project_name):
  """Produces a dptf map for the given configs.

  Produces a map that maps from design name to the dptf file config for that
  design. It looks for the dptf files at:
      DPTF_PATH + '/' + DPTF_FILE
  for a project wide config, that it maps under the empty string, and at:
      DPTF_PATH + '/' + design_name + '/' + DPTF_FILE
  for design specific configs that it maps under the design name.

  Args:
    configs: Source ConfigBundle to process.
    project_name: Name of project processing for.

  Returns:
    map from design name or empty string (project wide), to dptf config.
  """
  result = {}
  # Looking at top level for project wide, and then for each design name
  # for design specific.
  dirs = [""] + [d.name for d in configs.design_list]
  for directory in dirs:
    design = directory.lower()
    if os.path.exists(os.path.join(DPTF_PATH, design, DPTF_FILE)):
      project_dptf_path = os.path.join(project_name, design, DPTF_FILE)
      dptf_file = {
          'dptf-dv':
              project_dptf_path,
          'files': [
              _file(
                  os.path.join(project_name, DPTF_PATH, design, DPTF_FILE),
                  os.path.join('/etc/dptf', project_dptf_path))
          ]
      }
      result[directory] = dptf_file
  return result


def _wifi_sar_map(configs, project_name, output_dir, build_root_dir):
  """Constructs a map from design name to wifi sar config for that design.

  Constructs a map from design name to the wifi sar config for that design.
  In the process a wifi sar hex file is generated that the config points at.
  This mapping is only made for the intel wifi where the generated file is
  provided when building coreboot.

  Args:
    configs: Source ConfigBundle to process.
    project_name: Name of project processing for.
    output_dir: Path to the generated output.
    build_root_dir: Path to the config file from portage's perspective.

  Returns:
    dict that maps the design name onto the wifi config for that design.
  """
  # pylint: disable=too-many-locals
  result = {}
  programs = {p.id.value: p for p in configs.program_list}
  sw_configs = list(configs.software_configs)
  for hw_design in configs.design_list:
    for hw_design_config in hw_design.configs:
      sw_config = _sw_config(sw_configs, hw_design_config.id.value)
      if sw_config.wifi_config.HasField('intel_config'):
        sar_file_content = _create_intel_sar_file_content(
            sw_config.wifi_config.intel_config)
        design_name = hw_design.name.lower()
        program = _lookup(hw_design.program_id, programs)
        wifi_sar_id = _extract_fw_config_value(hw_design_config, program,
                                               'Intel wifi sar id')
        output_path = os.path.join(output_dir, 'wifi')
        os.makedirs(output_path, exist_ok=True)
        filename = 'wifi_sar_{}.hex'.format(wifi_sar_id)
        output_path = os.path.join(output_path, filename)
        build_path = os.path.join(build_root_dir, 'wifi', filename)
        if os.path.exists(output_path):
          with open(output_path, 'r') as f:
            if f.read() != sar_file_content:
              raise Exception(
                  'Project {} has conflicting wifi sar file content under '
                  'wifi sar id {}.'.format(project_name, wifi_sar_id))
        else:
          with open(output_path, 'w') as f:
            f.write(sar_file_content)
        system_path = '/firmware/cbfs-rw-raw/{}/{}'.format(
            project_name, filename)
        result[design_name] = {'sar-file': _file_v2(build_path, system_path)}
  return result


def _extract_fw_config_value(hw_design_config, program, name):
  """Extracts the firwmare config value with the given name.

  Args:
    hw_design_config: Design extracting value from.
    program: Program the `hw_design_config` belongs to.
    name: Name of firmware config segment to extract.

  Returns: the extracted value or raises a ValueError if no firmware
    configuration segment with `name` is found.
  """
  fw_config = hw_design_config.hardware_features.fw_config.value
  for fcs in program.firmware_configuration_segments:
    if fcs.name == name:
      value = fw_config & fcs.mask
      lsb_bit_set = (~fcs.mask + 1) & fcs.mask
      return value // lsb_bit_set
  raise ValueError(
      'No firmware configuration segment with name {} found'.format(name))


def _create_intel_sar_file_content(intel_config):
  """Creates and returns the intel sar file content for the given config.

  Creates and returns the sar file content that is used with intel drivers
  only.

  Args:
    intel_config: IntelConfig config.

  Returns:
    sar file content for the given config, see:
    https://chromeos.google.com/partner/dlm/docs/connectivity/wifidyntxpower.html
  """

  def to_hex(val):
    if val > 255 or val < 0:
      raise Exception('Sar file value %s out of range' % val)
    return '{0:0{1}X}'.format(val, 2)

  def power_table(tpc):
    return (to_hex(tpc.limit_2g) + to_hex(tpc.limit_5g_1) +
            to_hex(tpc.limit_5g_2) + to_hex(tpc.limit_5g_3) +
            to_hex(tpc.limit_5g_4))

  def wgds_value(wgds):
    return to_hex(wgds)

  def offset_table(offsets):
    return (to_hex(offsets.max_2g) + to_hex(offsets.offset_2g_a) +
            to_hex(offsets.offset_2g_b) + to_hex(offsets.max_5g) +
            to_hex(offsets.offset_5g_a) + to_hex(offsets.offset_5g_b))

  # See https://chromeos.google.com/partner/dlm/docs/connectivity/wifidyntxpower.html
  return (power_table(intel_config.tablet_mode_power_table_a) +
          power_table(intel_config.tablet_mode_power_table_b) +
          power_table(intel_config.non_tablet_mode_power_table_a) +
          power_table(intel_config.non_tablet_mode_power_table_b) +
          '00000000000000000000' + '00000000000000000000' +
          wgds_value(intel_config.wgds_version) +
          offset_table(intel_config.offset_fcc) +
          offset_table(intel_config.offset_eu) +
          offset_table(intel_config.offset_other))


def Main(project_configs, program_config, output):  # pylint: disable=invalid-name
  """Transforms source proto config into platform JSON.

  Args:
    project_configs: List of source project configs to transform.
    program_config: Program config for the given set of projects.
    output: Output file that will be generated by the transform.
  """
  configs = _merge_configs([_read_config(program_config)] +
                           [_read_config(config) for config in project_configs])
  touch_fw = {}
  camera_map = {}
  dptf_map = {}
  wifi_sar_map = {}
  output_dir = os.path.dirname(output)
  build_root_dir = output_dir
  if 'sw_build_config' in output_dir:
    full_path = os.path.realpath(output)
    project_name = re.match(r'.*/(\w*)/(public_)?sw_build_config/.*',
                            full_path).groups(1)[0]
    # Projects don't know about each other until they are integrated into the
    # build system.  When this happens, the files need to be able to co-exist
    # without any collisions.  This prefixes the project name (which is how
    # portage maps in the project), so project files co-exist and can be
    # installed together.
    # This is necessary to allow projects to share files at the program level
    # without having portage file installation collisions.
    build_root_dir = os.path.join(project_name, output_dir)

    camera_map = _camera_map(configs, project_name)
    dptf_map = _dptf_map(configs, project_name)
    wifi_sar_map = _wifi_sar_map(configs, project_name, output_dir,
                                 build_root_dir)

  if os.path.exists(TOUCH_PATH):
    touch_fw = _build_touch_file_config(configs, project_name)
  arc_hw_feature_files = _write_arc_hardware_feature_files(
      configs, output_dir, build_root_dir)
  arc_media_profile_files = _write_arc_media_profile_files(
      configs, output_dir, build_root_dir)
  config_files = ConfigFiles(
      arc_hw_features=arc_hw_feature_files,
      arc_media_profiles=arc_media_profile_files,
      touch_fw=touch_fw,
      dptf_map=dptf_map,
      camera_map=camera_map,
      wifi_sar_map=wifi_sar_map)
  write_output(_transform_build_configs(configs, config_files), output)


def main(argv=None):
  """Main program which parses args and runs

  Args:
    argv: List of command line arguments, if None uses sys.argv.
  """
  if argv is None:
    argv = sys.argv[1:]
  opts = parse_args(argv)
  Main(opts.project_configs, opts.program_config, opts.output)


if __name__ == '__main__':
  sys.exit(main(sys.argv[1:]))