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#!/usr/bin/python
# SPDX-License-Identifier: GPL-2.0+
#
# Copyright (C) 2017 Google, Inc
# Written by Simon Glass <sjg@chromium.org>
#
"""Scanning of U-Boot source for drivers and structs
This scans the source tree to find out things about all instances of
U_BOOT_DRIVER(), UCLASS_DRIVER and all struct declarations in header files.
See doc/driver-model/of-plat.rst for more informaiton
"""
import os
import re
import sys
def conv_name_to_c(name):
"""Convert a device-tree name to a C identifier
This uses multiple replace() calls instead of re.sub() since it is faster
(400ms for 1m calls versus 1000ms for the 're' version).
Args:
name (str): Name to convert
Return:
str: String containing the C version of this name
"""
new = name.replace('@', '_at_')
new = new.replace('-', '_')
new = new.replace(',', '_')
new = new.replace('.', '_')
return new
def get_compat_name(node):
"""Get the node's list of compatible string as a C identifiers
Args:
node (fdt.Node): Node object to check
Return:
list of str: List of C identifiers for all the compatible strings
"""
compat = node.props['compatible'].value
if not isinstance(compat, list):
compat = [compat]
return [conv_name_to_c(c) for c in compat]
class Driver:
"""Information about a driver in U-Boot
Attributes:
name: Name of driver. For U_BOOT_DRIVER(x) this is 'x'
"""
def __init__(self, name):
self.name = name
def __eq__(self, other):
return self.name == other.name
def __repr__(self):
return "Driver(name='%s')" % self.name
class Scanner:
"""Scanning of the U-Boot source tree
Properties:
_basedir (str): Base directory of U-Boot source code. Defaults to the
grandparent of this file's directory
_drivers: Dict of valid driver names found in drivers/
key: Driver name
value: Driver for that driver
_driver_aliases: Dict that holds aliases for driver names
key: Driver alias declared with
DM_DRIVER_ALIAS(driver_alias, driver_name)
value: Driver name declared with U_BOOT_DRIVER(driver_name)
_warning_disabled: true to disable warnings about driver names not found
_drivers_additional (list or str): List of additional drivers to use
during scanning
"""
def __init__(self, basedir, warning_disabled, drivers_additional):
"""Set up a new Scanner
"""
if not basedir:
basedir = sys.argv[0].replace('tools/dtoc/dtoc', '')
if basedir == '':
basedir = './'
self._basedir = basedir
self._drivers = {}
self._driver_aliases = {}
self._drivers_additional = drivers_additional or []
self._warning_disabled = warning_disabled
def get_normalized_compat_name(self, node):
"""Get a node's normalized compat name
Returns a valid driver name by retrieving node's list of compatible
string as a C identifier and performing a check against _drivers
and a lookup in driver_aliases printing a warning in case of failure.
Args:
node (Node): Node object to check
Return:
Tuple:
Driver name associated with the first compatible string
List of C identifiers for all the other compatible strings
(possibly empty)
In case of no match found, the return will be the same as
get_compat_name()
"""
compat_list_c = get_compat_name(node)
for compat_c in compat_list_c:
if not compat_c in self._drivers.keys():
compat_c = self._driver_aliases.get(compat_c)
if not compat_c:
continue
aliases_c = compat_list_c
if compat_c in aliases_c:
aliases_c.remove(compat_c)
return compat_c, aliases_c
if not self._warning_disabled:
print('WARNING: the driver %s was not found in the driver list'
% (compat_list_c[0]))
return compat_list_c[0], compat_list_c[1:]
def scan_driver(self, fname):
"""Scan a driver file to build a list of driver names and aliases
This procedure will populate self._drivers and self._driver_aliases
Args
fname: Driver filename to scan
"""
with open(fname, encoding='utf-8') as inf:
try:
buff = inf.read()
except UnicodeDecodeError:
# This seems to happen on older Python versions
print("Skipping file '%s' due to unicode error" % fname)
return
# The following re will search for driver names declared as
# U_BOOT_DRIVER(driver_name)
drivers = re.findall(r'U_BOOT_DRIVER\((.*)\)', buff)
for driver in drivers:
self._drivers[driver] = Driver(driver)
# The following re will search for driver aliases declared as
# DM_DRIVER_ALIAS(alias, driver_name)
driver_aliases = re.findall(
r'DM_DRIVER_ALIAS\(\s*(\w+)\s*,\s*(\w+)\s*\)',
buff)
for alias in driver_aliases: # pragma: no cover
if len(alias) != 2:
continue
self._driver_aliases[alias[1]] = alias[0]
def scan_drivers(self):
"""Scan the driver folders to build a list of driver names and aliases
This procedure will populate self._drivers and self._driver_aliases
"""
for (dirpath, _, filenames) in os.walk(self._basedir):
for fname in filenames:
if not fname.endswith('.c'):
continue
self.scan_driver(dirpath + '/' + fname)
for fname in self._drivers_additional:
if not isinstance(fname, str) or len(fname) == 0:
continue
if fname[0] == '/':
self.scan_driver(fname)
else:
self.scan_driver(self._basedir + '/' + fname)
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