dacboard/tree/usr/local/bin/mmc2.py

#!/usr/bin/env python3
import os
import sys
import time
import subprocess
import signal

MMC2DEV=['/dev/mmcblk1p1', '/dev/mmcblk2p1', '/dev/mmcblk3p1', '/dev/mmcblk4p1']
MMC2DEBUG='/sys/kernel/debug/mmc'
MODPROBE='/sbin/modprobe'

def mountMMC2():
	mmc_number=0
	dev=None
	for d in MMC2DEV:
		mmc_number += 1
		if os.path.exists(d):
			dev = d
			break

	if dev is not None:
		r=None
		for i in range(10):
			r=subprocess.run(['/bin/mount', dev, '/extSD','-o','user,ro,umask=000,iocharset=utf8,codepage=932,shortname=mixed'])
			if r.returncode != 0:
				time.sleep(1)
			else:
				break
	
		if r.returncode != 0:
			print('mmc' + str(mmc_number) +' mount failed.', file=sys.stderr)
			return False
		else:
			mmc_clock = MMC2DEBUG + str(mmc_number) + '/clock'
			if os.path.exists(mmc_clock):
				with open(mmc_clock,'w') as f:
					f.write('16000000')
			return True
	else:
		os.system(MODPROBE + ' -r mmc_spi')
		print('Can not find 2nd mmc', file=sys.stderr)
		return False

def umountMMC2():
	os.system('/bin/umount /extSD')
	return
		
def signal_handler(signal, handler):
	umountMMC2()
	sys.exit(0)

	
# Script starts here
if __name__ == "__main__":
	signal.signal(signal.SIGINT, signal_handler)
	signal.signal(signal.SIGTERM, signal_handler)
	
	if mountMMC2():
		while True:
			time.sleep(86400)
	else:
		sys.exit('exit mmc2.py')