sweetberry: converter tool for servo_ina

convert_servo_ina.py can convert power log config
files from hdctools/servo/data into sweetberry configs

BRANCH=None
BUG=b:35578707
TEST=compare kevin_r0_loc.py output with kevin.board

Change-Id: Iadc57fe4eb1f5b220c6bffe3a3fe8a10b0d6b5a2
Signed-off-by: Nick Sanders <nsanders@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/634486

extra/usb_power/board.README

@@ -8,6 +8,18 @@ a ".board" file, and one describing the particular rails you want to
 monitor in this session, a ".scenario" file.
 
 
+Converting from servo_ina configs:
+
+Many configs can be found for the servo_ina_board in hdctools/servo/data/.
+Sweetberry is plug compatible with servo_ina headers, and config files
+can be converted with the following tool:
+
+./convert_servo_ina.py kevin_r0_loc.py
+
+This will produce kevin_r0_loc.board and kevin_r0_loc.scenario which
+can be used with powerlog.py.
+
+
 Board files:
 
 Board files contain a list of rails, supporting 48 channels each on up to two

extra/usb_power/convert_servo_ina.py

@@ -0,0 +1,74 @@
+#!/usr/bin/python
+# Copyright 2017 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.
+
+"""Program to convert power logging config from a servo_ina device
+   to a sweetberry config.
+"""
+
+
+import os
+import sys
+
+
+def fetch_records(basename):
+  """Import records from servo_ina file.
+
+  servo_ina files are python imports, and have a list of tuples with
+  the INA data.
+  (inatype, i2caddr, rail name, bus voltage, shunt ohms, mux, True)
+
+  Args:
+    basename: python import name (filename -.py)
+
+  Returns:
+    list of tuples as described above.
+  """
+  ina_desc = __import__(basename)
+  return ina_desc.inas
+
+
+def main(argv):
+  if len(argv) != 2:
+    print "usage:"
+    print " %s input.py" % argv[0]
+    return
+
+  inputf = argv[1]
+  basename = os.path.splitext(inputf)[0]
+  outputf = basename + '.board'
+  outputs = basename + '.scenario'
+
+  print "Converting %s to %s, %s" % (inputf, outputf, outputs)
+
+  inas = fetch_records(basename)
+
+
+  boardfile = open(outputf, 'w')
+  scenario = open(outputs, 'w')
+
+  boardfile.write('[\n')
+  scenario.write('[\n')
+  start = True
+
+  for rec in inas:
+    if start:
+      start = False
+    else:
+      boardfile.write(',\n')
+      scenario.write(',\n')
+
+    record = '  {"name": "%s", "rs": %f, "sweetberry": "A", "channel": %d}' % (
+             rec[2], rec[4], rec[1] - 64)
+    boardfile.write(record)
+    scenario.write('"%s"' % rec[2])
+
+  boardfile.write('\n')
+  boardfile.write(']')
+
+  scenario.write('\n')
+  scenario.write(']')
+
+if __name__ == "__main__":
+  main(sys.argv)