#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import os

APPLICATION_NAME = 'SD and MMC Block Device Attributes Reader'
APPLICATION_VERSION = 0.02
SEPARATOR_LENGTH = 40
SYS_DEVICE = '/sys/block/mmcblk0/device'

# https://mjmwired.net/kernel/Documentation/mmc/mmc-dev-attrs.txt
SD_MMC_ATTRS = [
  'cid',                        # Card Identification Register
  'csd',                        # Card Specific Data Register
  'scr',                        # SD Card Configuration Register (SD only)
  'date',                       # Manufacturing Date (from CID Register)
  'fwrev',                      # Firmware/Product Revision (from CID Register) (SD and MMCv1 only)
  'hwrev',                      # Hardware/Product Revision (from CID Register) (SD and MMCv1 only)
  'manfid',                     # Manufacturer ID (from CID Register)
  'name',                       # Product Name (from CID Register)
  'oemid',                      # OEM/Application ID (from CID Register)
  'prv',                        # Product Revision (from CID Register) (SD and MMCv4 only)
  'serial',                     # Product Serial Number (from CID Register)
  'erase_size',                 # Erase group size
  'preferred_erase_size',       # Preferred erase size
  'raw_rpmb_size_mult',         # RPMB partition size
  'rel_sectors',                # Reliable write sector count
  'ocr',                        # Operation Conditions Register
  'dsr',                        # Driver Stage Register
  'cmdq_en',                    # Command Queue enabled: 1 => enabled, 0 => not enabled
]

def cat(filename):
    with open(filename) as fp:
        result = fp.read()
    return result.replace('\n', '\\n')

def main():
    print('\n' + '=' * 5 +
      f' {APPLICATION_NAME} Ver {APPLICATION_VERSION} ' +
      '=' * 5)
    print(f'device: {SYS_DEVICE}')
    print('-' * SEPARATOR_LENGTH)
    for index, attr in enumerate(SD_MMC_ATTRS):
        path = os.path.join(SYS_DEVICE, attr)
        if os.path.isfile(path):
            if attr == 'oemid':
                hex_string = cat(path)
                ascii_string = bytes.fromhex(hex_string.replace('\\n', '')[2:]).decode('ASCII')
                print(f'{attr}: {hex_string} (\'{ascii_string}\')')
            else:
                print(f'{attr}: {cat(path)}')
        else:
            print(f'{attr}: None')
    print('-' * SEPARATOR_LENGTH)

if __name__ == '__main__':
    main()