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from . import hotplug
from .decorators import *
import tuned.logs
from tuned.utils.commands import commands
import os
import errno
import struct
import glob
log = tuned.logs.get()
cmd = commands()
class AudioPlugin(hotplug.Plugin):
"""
Sets audio cards power saving options. The plug-in sets the auto suspend
timeout for audio codecs to the value specified by the [option]`timeout`
option.
Currently, the `snd_hda_intel` and `snd_ac97_codec` codecs are
supported and the [option]`timeout` value is in seconds. To disable
auto suspend for these codecs, set the [option]`timeout` value
to `0`. To enforce the controller reset, set the option
[option]`reset_controller` to `true`. Note that power management
is supported per module. Hence, the kernel module names are used as
device names.
.Set the timeout value to 10s and enforce the controller reset
====
----
[audio]
timeout=10
reset_controller=true
----
====
"""
def _init_devices(self):
self._devices_supported = True
self._assigned_devices = set()
self._free_devices = set()
for device in self._hardware_inventory.get_devices("sound").match_sys_name("card*"):
module_name = self._device_module_name(device)
if module_name in ["snd_hda_intel", "snd_ac97_codec"]:
self._free_devices.add(module_name)
def _instance_init(self, instance):
instance._has_static_tuning = True
instance._has_dynamic_tuning = False
def _instance_cleanup(self, instance):
pass
def _device_module_name(self, device):
try:
return device.parent.driver
except:
return None
@classmethod
def _get_config_options(cls):
return {
"timeout": 0,
"reset_controller": True,
}
def _timeout_path(self, device):
return "/sys/module/%s/parameters/power_save" % device
def _reset_controller_path(self, device):
return "/sys/module/%s/parameters/power_save_controller" % device
@command_set("timeout", per_device = True)
def _set_timeout(self, value, device, instance, sim, remove):
try:
timeout = int(value)
except ValueError:
log.error("timeout value '%s' is not integer" % value)
return None
if timeout >= 0:
sys_file = self._timeout_path(device)
if not sim:
cmd.write_to_file(sys_file, "%d" % timeout, \
no_error = [errno.ENOENT] if remove else False)
return timeout
else:
return None
@command_get("timeout")
def _get_timeout(self, device, instance, ignore_missing=False):
sys_file = self._timeout_path(device)
value = cmd.read_file(sys_file, no_error=ignore_missing)
if len(value) > 0:
return value
return None
@command_set("reset_controller", per_device = True)
def _set_reset_controller(self, value, device, instance, sim, remove):
v = cmd.get_bool(value)
sys_file = self._reset_controller_path(device)
if os.path.exists(sys_file):
if not sim:
cmd.write_to_file(sys_file, v, \
no_error = [errno.ENOENT] if remove else False)
return v
return None
@command_get("reset_controller")
def _get_reset_controller(self, device, instance, ignore_missing=False):
sys_file = self._reset_controller_path(device)
if os.path.exists(sys_file):
value = cmd.read_file(sys_file)
if len(value) > 0:
return cmd.get_bool(value)
return None