Viewing file:  plugin_usb.py (1.97 KB) -rw-r--r--
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from . import base
from .decorators import *
import tuned.logs
from tuned.utils.commands import commands
import glob
import errno
log = tuned.logs.get()
class USBPlugin(base.Plugin):
"""
`usb`::
Sets autosuspend timeout of USB devices to the value specified by the
[option]`autosuspend` option in seconds. If the [option]`devices`
option is specified, the [option]`autosuspend` option applies to only
the USB devices specified, otherwise it applies to all USB devices.
+
The value `0` means that autosuspend is disabled.
+
.To turn off USB autosuspend for USB devices `1-1` and `1-2`
====
----
[usb]
devices=1-1,1-2
autosuspend=0
----
====
"""
def _init_devices(self):
self._devices_supported = True
self._free_devices = set()
self._assigned_devices = set()
for device in self._hardware_inventory.get_devices("usb").match_property("DEVTYPE", "usb_device"):
self._free_devices.add(device.sys_name)
self._cmd = commands()
def _get_device_objects(self, devices):
return [self._hardware_inventory.get_device("usb", x) for x in devices]
@classmethod
def _get_config_options(self):
return {
"autosuspend" : None,
}
def _instance_init(self, instance):
instance._has_static_tuning = True
instance._has_dynamic_tuning = False
def _instance_cleanup(self, instance):
pass
def _autosuspend_sysfile(self, device):
return "/sys/bus/usb/devices/%s/power/autosuspend" % device
@command_set("autosuspend", per_device=True)
def _set_autosuspend(self, value, device, sim, remove):
enable = self._option_bool(value)
if enable is None:
return None
val = "1" if enable else "0"
if not sim:
sys_file = self._autosuspend_sysfile(device)
self._cmd.write_to_file(sys_file, val, \
no_error = [errno.ENOENT] if remove else False)
return val
@command_get("autosuspend")
def _get_autosuspend(self, device, ignore_missing=False):
sys_file = self._autosuspend_sysfile(device)
return self._cmd.read_file(sys_file, no_error=ignore_missing).strip()
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