83 lines
2.4 KiB
Python
83 lines
2.4 KiB
Python
#
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# psuutil.py
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# Platform-specific PSU status interface for SONiC
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#
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import os
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try:
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from sonic_psu.psu_base import PsuBase
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except ImportError as e:
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raise ImportError(str(e) + "- required module not found")
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GPIO_DIR = "/sys/class/gpio"
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GPIO_LABEL = "pca9505"
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DX010_MAX_PSUS = 2
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class PsuUtil(PsuBase):
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"""Platform-specific PSUutil class"""
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def __init__(self):
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PsuBase.__init__(self)
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# DX010 PSU pin mapping
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self.dx010_psu_gpio = [
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{'base': self.__get_gpio_base()},
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{'prs': 27, 'status': 22},
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{'prs': 28, 'status': 25}
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]
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def __read_txt_file(self, file_path):
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try:
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with open(file_path, 'r') as fd:
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data = fd.read()
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return data.strip()
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except IOError:
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pass
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return ""
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def __get_gpio_base(self):
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for r in os.listdir(GPIO_DIR):
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label_path = os.path.join(GPIO_DIR, r, "label")
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if "gpiochip" in r and GPIO_LABEL in self.__read_txt_file(label_path):
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return int(r[8:], 10)
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return 216 # Reserve
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def __get_gpio_value(self, pinnum):
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gpio_base = self.dx010_psu_gpio[0]['base']
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gpio_dir = GPIO_DIR + '/gpio' + str(gpio_base+pinnum)
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gpio_file = gpio_dir + "/value"
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retval = self.__read_txt_file(gpio_file)
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return retval.rstrip('\r\n')
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def get_num_psus(self):
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"""
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Retrieves the number of PSUs available on the device
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:return: An integer, the number of PSUs available on the device
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"""
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return DX010_MAX_PSUS
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def get_psu_status(self, index):
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"""
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Retrieves the oprational status of power supply unit (PSU) defined
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by index <index>
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:param index: An integer, index of the PSU of which to query status
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:return: Boolean, True if PSU is operating properly, False if PSU is\
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faulty
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"""
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raw = self.__get_gpio_value(
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self.dx010_psu_gpio[index]['status'])
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return int(raw, 10) == 1
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def get_psu_presence(self, index):
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"""
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Retrieves the presence status of power supply unit (PSU) defined
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by index <index>
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:param index: An integer, index of the PSU of which to query status
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:return: Boolean, True if PSU is plugged, False if not
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"""
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raw = self.__get_gpio_value(self.dx010_psu_gpio[index]['prs'])
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return int(raw, 10) == 0
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