xref: /openbmc/skeleton/pytools/gpioutil (revision ff47af29) 
1#!/usr/bin/env python
2
3import sys
4import os
5import getopt
6import obmc_system_config as System
7
8
9def printUsage():
10	print '\nUsage:'
11	print 'gpioutil -n GPIO_NAME  [-v value]'
12	print 'gpioutil -i GPIO_NUM  -d <DIRECTION = in,out,falling,rising,both> [-v value]'
13	print 'gpioutil -p PIN_NAME  -d <DIRECTION = in,out,falling,rising,both> [-v value]'
14	print 'gpioutil -l PIN_NAME     (lookup pin name only)'
15	exit(1)
16
17
18
19if (len(sys.argv) < 2):
20	printUsage()
21
22# Pop the command name and point to the args
23sys.argv.pop(0)
24
25GPIO_SYSFS = '/sys/class/gpio/'
26
27class Gpio:
28	def __init__(self,gpio_num):
29		self.gpio_num = str(gpio_num)
30		self.direction = ''
31		self.interrupt = ''
32		self.exported = False
33
34	def getPath(self,name):
35		return GPIO_SYSFS+'gpio'+self.gpio_num+'/'+name
36
37	def export(self):
38		if (os.path.exists(GPIO_SYSFS+'export') == False):
39			raise Exception("ERROR - GPIO_SYSFS path does not exist.  Does this platform support GPIOS?")
40		if (os.path.exists(GPIO_SYSFS+'gpio'+self.gpio_num) == False):
41			self.write(GPIO_SYSFS+'export',self.gpio_num)
42
43		self.exported = True
44
45	def setDirection(self,dir):
46		if (self.exported == False):
47			raise Exception("ERROR - Not exported: "+self.getPath())
48
49		self.direction = ''
50		self.interrupt = ''
51		if (dir == 'in' or dir == 'out'):
52			self.direction = dir
53		elif (dir == 'rising' or
54		      dir == 'falling' or
55		      dir == 'both'):
56			self.direction = 'in'
57			self.interrupt = dir
58			self.write(self.getPath('edge'),self.interrupt)
59		else:
60			raise Exception("ERROR - Invalid Direction: "+dir)
61
62
63		self.write(self.getPath('direction'),self.direction)
64
65	def setValue(self,value):
66		if (value == '0'):
67			self.write(self.getPath('value'),'0')
68		elif (value == '1'):
69			self.write(self.getPath('value'),'1')
70		else:
71			raise Exception("ERROR - Invalid value: "+value)
72
73	def getValue(self):
74		return self.read(self.getPath('value'))
75
76	def write(self,path,data):
77		f = open(path,'w')
78		f.write(data)
79		f.close()
80
81
82	def read(self,path):
83		f = open(path,'r')
84		data = f.readline()
85		f.close()
86		return data
87
88
89
90if __name__ == '__main__':
91
92	try:
93		opts, args = getopt.getopt(sys.argv,"hn:i:d:v:p:l:")
94 	except getopt.GetoptError:
95 		printUsage()
96
97
98
99	lookup = False
100	gpio_name = ""
101	value = ""
102	direction = ""
103	for opt, arg in opts:
104 		if opt == '-h':
105			printUsage()
106
107 		elif opt in ("-n"):
108 			gpio_name = arg
109			lookup = True
110 		elif opt in ("-i"):
111 			gpio_name = arg
112 		elif opt in ("-d"):
113			direction = arg
114 		elif opt in ("-v"):
115			value = arg
116		elif opt in ("-p"):
117			gpio_name = System.convertGpio(arg)
118		elif opt in ("-l"):
119			gpio_name = System.convertGpio(arg)
120			print gpio_name
121			exit(0)
122
123	gpio_info = {}
124	if (lookup == True):
125		if (System.GPIO_CONFIG.has_key(gpio_name) == False):
126			print "ERROR - GPIO Name doesn't exist"
127			print "Valid names: "
128			for n in System.GPIO_CONFIG:
129				print "\t"+n
130			exit(0)
131		gpio_info = System.GPIO_CONFIG[gpio_name]
132		direction = gpio_info['direction']
133		if (gpio_info.has_key('gpio_num')):
134			gpio_name = str(gpio_info['gpio_num'])
135		else:
136			gpio_name = str(System.convertGpio(gpio_info['gpio_pin']))
137		print "GPIO ID: "+gpio_name+"; DIRECTION: "+direction
138
139
140	## Rules
141	if (gpio_name == ""):
142		print "ERROR - Gpio not specified"
143		printUsage()
144
145	if (direction == "in" and value != ""):
146		print "ERROR - Value cannot be specified when direction = in"
147		printUsage()
148
149	gpio = Gpio(gpio_name)
150	try:
151		gpio.export()
152		if (direction != ""):
153			gpio.setDirection(direction)
154
155		if (value == ""):
156			print gpio.getValue()
157		else:
158			gpio.setValue(value)
159
160	except Exception as e:
161		print e
162
163