Commit Graph

147 Commits

Author SHA1 Message Date
Takashi Iwai
d045c5dc43 ALSA: hda - Fix missing Mic Boost controls for VIA codecs
Some VIA codecs like VT1708S have Mic boost amps in the mic pins but
they aren't exposed in the capability bits.  In the past driver code,
we override the pin caps and create mic boost controls forcibly.
While transition to the generic parser, we lost the mic boost controls
although the pin caps are still overridden, because the generic parser
code checks the widget caps, too.

So this patch adds a new helper function to allow the override of the
given widget capability bits, and makes VIA codecs driver to add the
missing input-amp capability bit.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=59861
Cc: <stable@vger.kernel.org> [v3.9+]
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-06-19 07:54:09 +02:00
Takashi Iwai
06ec56d3c6 ALSA: hda - Fix return value of snd_hda_check_power_state()
The refactoring by commit 9040d102 introduced the new function
snd_hda_check_power_state().  This function is supposed to return true
if the state already reached to the target state, but it actually
returns false for that.  An utterly stupid typo while copy & paste.

Fortunately this didn't influence on much behavior because powering up
AFG usually powers up the child widgets, too.  But the finer power
control must have been broken by this bug.

Cc: <stable@vger.kernel.org> [v3.9+]
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-06-18 07:59:43 +02:00
Takashi Iwai
ba615b86d6 ALSA: hda - Don't apply EAPD power filter as default
So far, the driver doesn't power down the widget at going down to D3
when the widget node has an EAPD capability and EAPD is actually set
on all codecs unless codec->power_filter is set explicitly.
This caused a problem on some Conexant codecs, leading to click
noises, and we set it as NULL there.  But it is very unlikely that the
problem hits only these codecs.

Looking back at the development history, this workaround for EAPD was
introduced just for some laptops with STAC9200 codec, then we applied
it blindly for all.  Now, since it's revealed to have an ill effect,
we should disable this workaround per default and apply only for the
known requiring systems.

The EAPD workaround is implemented now as snd_hda_codec_eapd_power_filter(),
and this has to be set explicitly by the codec driver when needed.
As of now, only patch_stac9200() sets this one.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-03-13 18:07:05 +01:00
David Henningsson
4bd038f9d8 ALSA: hda - hdmi: Protect ELD buffer
Because the eld buffer can be simultaneously accessed from both
workqueue context (updating) and process context (kcontrol read),
we need to protect it with a mutex to guarantee consistency.

To avoid holding the mutex while reading the ELD info from the
codec, we introduce a temporary eld buffer.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-02-19 18:28:30 +01:00
David Henningsson
1613d6b46b ALSA: hda - hdmi: Refactor hdmi_eld into parsed_hdmi_eld
For better readability, the information that is parsed out of the
ELD data is now put into a separate parsed_hdmi_eld struct.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-02-19 18:28:22 +01:00
Takashi Iwai
9040d102da ALSA: hda - Add snd_hda_check_power_state() helper function
... for small refactoring.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-01-24 17:47:17 +01:00
Takashi Iwai
1f57825077 ALSA: hda - Add chained_before flag to the fixup entry
Sometimes we want to call a fixup after applying other existing
fixups, but currently the fixup chain mechanism allows only the call
the others after the target fixup.  This patch adds a new flag,
chained_before, to struct hda_fixup, for allowing the chained call
before the current execution.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-01-23 18:10:10 +01:00
Takashi Iwai
dc870f38e9 ALSA: hda - Combine snd_hda_codec_flush_*_cache() to a single function
Since both snd_hda_codec_flush_amp_cache() and
snd_hda_codec_flush_cmd_cache() are called usually at the same time,
we can simply combine them to a single function,
snd_hda_codec_flush_cache().

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-01-22 15:25:25 +01:00
Takashi Iwai
bc759721fb ALSA: hda - Add snd_hda_get_int_hint() helper function
It'll be used in hda_generic.c, too.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-01-12 08:44:47 +01:00
Takashi Iwai
fd1082159d ALSA: hda - Add a new fixup type to override pinctl values
Add a new fixup type, HDA_FIXUP_PINCTLS, for overriding the pinctl
values of the given pins.  It takes the same array of struct pintbl
like HDA_FIXUP_PINS, but each entry contains the pinctl value instead
of the pin default config value.

This patch also replaces the corresponding codes in patch_realtek.c.
Without this change, the direct call of verbs may be overridden again
by the later call of pinctl restoration by the driver.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-01-12 08:44:35 +01:00
Takashi Iwai
62f3a2f718 ALSA: hda - More strict correction of invalid pinctl bits
Check more strictly about the validity of pinctl values in
snd_hda_set_pin_ctl() and correct the wrong bits automatically.
Also provide the helper function to correct pinctl bits to codec
drivers.

This automatically fixes the invalid pinctl writes that are found in
a few Realtek fixups for NID 0x0f amp like ASUS A6Rp.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-01-12 08:44:27 +01:00
Takashi Iwai
d7fdc00ae5 ALSA: hda - Add helper functions to cache the current pinctl target
We already have the list of whole pin widgets and there is an unused
space in the list; let's use it for caching the current pinctl value.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-01-12 08:44:25 +01:00
Takashi Iwai
0c3d47b007 ALSA: hda - Add snd_hda_codec_flush_*_cache() aliases
It makes easier to understand although these are identical with
snd_hda_codec_resume_*() functions.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-01-12 08:33:59 +01:00
Takashi Iwai
c9ce6b260b ALSA: hda - Move fixup code into struct hda_codec
Since the fixup code is used commonly, it's worth to move it to the
common place, struct hda_codec, instead of keeping in hda_gen_spec.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-01-12 08:30:45 +01:00
Takashi Iwai
130e5f0642 ALSA: hda/realtek - Add path active flag
... and rewrite the initialization of output paths as a generic
function that is applicable for both i/o directions.

The new flag, active, is introduced to each nid_path entry.  This
indicates whether the given path is active, and it's used for checking
whether a certain widget can be turned off or changed when a path is
no longer used or newly enabled.

It's still used only in the output paths.  More wider adaption for
input and loopback paths will be achieved in the later patch.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-01-12 08:30:05 +01:00
Takashi Iwai
280e57d544 ALSA: hda - Introduce snd_hda_codec_amp_init*()
The new function snd_hda_codec_amp_init() (and the stereo variant)
initializes the amp value only once at the first access.  If the amp
was already initialized or updated, this won't do anything more.

It's useful for initializing the input amps that are in the part of
the path but never used.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-01-12 08:30:02 +01:00
Takashi Iwai
c370dd6e9f ALSA: hda - Introduce cache & flush cmd / amp writes
For optimizing the verb executions, a new mechanism to cache the verbs
and amp update commands is introduced.  With the new "write to cache
and flush" way, you can reduce the same verbs that have been written
multiple times.

When codec->cached_write flag is set, the further
snd_hda_codec_write_cache() and snd_hda_codec_amp_stereo() calls will
be performed only on the command or amp cache table, but not sent to
the hardware yet.  Once after you call all commands and update amps,
call snd_hda_codec_resume_amp() and snd_hda_codec_resume_cache().
Then all cached writes and amp updates will be written to the
hardware, and the dirty flags are cleared.

In this implementation, the existing cache table is reused, so
actually no big code change is seen here.  Each cache entry has a new
dirty flag now (so the cache key is now reduced to 31bit).

As a good side-effect by this change, snd_hda_codec_resume_*() will no
longer execute verbs that have been already issued during the resume
phase by checking the dirty flags.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-01-12 08:29:17 +01:00
Takashi Iwai
dda415d418 ALSA: hda - Add a helper function for simple enum kcontrols
The same type of code is being used in multiple places in various
codec drivers, so put it as a core library.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2012-11-30 18:34:38 +01:00
Takashi Iwai
dcda580616 ALSA: hda - Add workaround for conflicting IEC958 controls
When both an SPDIF and an HDMI device are created on the same card
instance, multiple IEC958 controls are created with indices=0, 1, ...
But the alsa-lib configuration can't know which index corresponds
actually to which PCM device, and both the SPDIF and the HDMI
configurations point to the first IEC958 control wrongly.

This patch introduces a (hackish and ugly) workaround: the IEC958
controls for the SPDIF device are re-labeled with device=1 when HDMI
coexists.  The device=1 corresponds to the actual PCM device for
SPDIF, so it's anyway a better representation.  In future, HDMI
controls should be moved with the corresponding PCM device number,
too.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2012-10-17 08:42:00 +02:00
Takashi Iwai
83012a7ccb ALSA: hda - Clean up CONFIG_SND_HDA_POWER_SAVE
CONFIG_SND_HDA_POWER_SAVE is no longer an experimental feature and its
behavior can be well controlled via the default value and module
parameter.  Let's just replace it with the standard CONFIG_PM.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2012-08-30 07:50:13 -07:00
Takashi Iwai
0401e8548e ALSA: hda - Move beep helper functions to hda_beep.c
Move snd_hda_mixer_amp_switch_put_beep() to hda_beep.c as a clean up
to remove one more ifdef.

Also add the corresponding get callback to return consistently the
digital beep state independently from the mixer amp value.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2012-07-03 18:31:36 +02:00
Takashi Iwai
128bc4ba8c ALSA: hda - Move BIOS pin-parser code to hda_auto_parser.c
Just code shuffles.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2012-05-08 18:01:33 +02:00
Takashi Iwai
4740860b53 ALSA: hda - Add snd_hda_get_default_vref() helper function
Add a new helper function to guess the default VREF pin control bits
for mic in.  This can be used to set the pin control value safely
matching with the actual pin capabilities.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2012-04-20 13:06:53 +02:00
Takashi Iwai
cdd03cedc5 ALSA: hda - Introduce snd_hda_set_pin_ctl*() helper functions
For setting the pin-control values more safely to match with the
actual pin capability bits, a copule of new helper functions,
snd_hda_set_pin_ctl() and snd_hda_set_pin_ctl_cache(), are
introduced.  These are simple replacement of the codec verb write with
AC_VERB_SET_PIN_WIDGET but do more sanity checks and filter out
superfluous pin-control bits if they don't fit with the corresponding
pin capabilities.

Some codecs are screwed up or ignore the command when such a wrong bit
is set.  These helpers will avoid such secret errors.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2012-04-20 12:38:48 +02:00
Takashi Iwai
f29735cbef ALSA: hda - Add expose_enum_ctl flag to snd_hda_add_vmaster_hook()
Since it's not always safe to assume that the vmaster hook is purely the
mute-LED control, add the flag indicating whether to expose the mute-LED
enum control or not.  Currently, conexant codec sets this off for non-HP
laptops where EAPD may be used really as EAPD.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2012-03-13 07:55:10 +01:00
Takashi Iwai
d2f344b5e0 ALSA: hda - Add "Mute-LED Mode" enum control
Create snd_hda_add_vmaster_hook() and snd_hda_sync_vmaster_hook()
helper functions to handle the mute-LED in vmaster hook more
commonly.  In the former function, a new enum control "Mute-LED Mode"
is added.  This provides user to choose whether the mute-LED should be
turned on/off explicitly or to follow the master-mute status.

Reviewed-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2012-03-13 07:46:50 +01:00
Takashi Iwai
29e5853d61 ALSA: hda - Return the created kcontrol in __snd_hda_add_vmaster()
It'll be used for adding hooks in later patches.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2012-03-12 14:52:28 +01:00
Takashi Iwai
18478e8b62 ALSA: hda - Initialize vmaster slave volumes
When the driver is changed to use vmaster or a new slave element is
added by the improvement of the parser code, user may face often the
silent output because of the muted slave mixer although Master volume
is properly set.  And they complain.  And I get upset.

Although such a mixer element should be initialized via "alsactl init",
it'd be more user-friendly if the known output slaves are unmuted and
set to 0dB so that user can control the volume only with Master as
default.  Since Master is still set muted as default even with this
change, no risk of the speaker blow up, too.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2012-03-09 17:55:30 +01:00
Takashi Iwai
9322ca5497 ALSA: hda - Add suffix argument to snd_hda_add_vmaster()
In most cases, the slave strings for vmaster are identical between
volumes and switches except for "xxx Volume" and "xxx Switch" suffix.
Now snd_hda_add_vmaster() takes the optional suffix argument so that
each string can be composed with the given suffix, and we can share the
slave name strings in both volume and switch calls nicely.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2012-02-03 14:28:01 +01:00
Takashi Iwai
3a90274de3 ALSA: hda - Return the error from get_wcaps_type() for invalid NIDs
When an invalid NID is given, get_wcaps() returns zero as the error,
but get_wcaps_type() takes it as the normal value and returns a bogus
AC_WID_AUD_OUT value.  This confuses the parser.

With this patch, get_wcaps_type() returns -1 when value 0 is given,
i.e. an invalid NID is passed to get_wcaps().

Bugzilla: https://bugzilla.novell.com/show_bug.cgi?id=740118

Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2012-01-10 12:41:22 +01:00
Takashi Iwai
31ef225793 ALSA: hda - Integrate input-jack stuff into kctl-jack
Instead of managing input-jack stuff separately, call all stuff inside
the kctl-jack creation, deletion and report.  The caller no longer needs
to care about input-jack.

The better integration between input-jack and kctl-jack should be done
in the upper layer in near future, but for now, it's implemented locally
for more tests.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-12-01 17:47:54 +01:00
Takashi Iwai
201e06ffa9 ALSA: hda - Give more unique names by snd_hda_get_pin_label()
The function now gives more unique names for the output pins by adding
some prefix and suffix for the location and the channels.  Otherwise, it
can pass the index number.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-11-16 15:48:23 +01:00
Takashi Iwai
aad37dbd56 ALSA: hda - Merge input-jack helpers to hda_jack.c
We can use the very same table in hda_jack.c for managing the list for
input-jack elements, too.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-11-16 11:14:04 +01:00
Takashi Iwai
1835a0f9a2 ALSA: hda - Cache the jack-detection value
Introduce a table containing the pins and their jack-detection states
for avoiding the unnecessary verbs to check the pin status at each time.

When the unsol event is enabled via snd_hda_jack_detect_enable(), it
automatically adds the given NID to the table.  Then the driver supposes
that the codec driver will set the dirty flag appropariately when an
unsolicited event is invoked for that pin.

The behavior for reading other pins that aren't registered in the table
doesn't change.  Only the pins assigned to the table are cached, so far.

In near futre, this table can be extended to use the central place for
the unsolicited events of all pins, etc, and eventually include the
jack-detect kcontrols that replace the current input-jack stuff.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-11-16 11:11:15 +01:00
Takashi Iwai
04f5ade6af ALSA: hda - Introduce snd_hda_get_pin_label()
Create a new helper function snd_hda_get_pin_label() for getting a label
string for both input and output pins.  hda_get_input_pin_label() is
obsoleted by this function, and the callers are replaced appropriately
now by this patch.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-11-16 11:10:16 +01:00
Wu Fengguang
b95d68b817 ALSA: hda - fix ELD memory leak
memset(eld) clears eld->proc_entry which will leak the struct
snd_info_entry when unloading module.

Fix it by
- memset only the fields before eld->eld_buffer
- set eld->eld_valid to true _after_ all eld fields have been filled

Cc: <stable@kernel.org>
Cc: Pierre-louis Bossart <pierre-louis.bossart@intel.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-11-16 10:44:21 +01:00
Takashi Iwai
2f451d2a2a ALSA: hda - Re-enable the check NO_PRESENCE misc bit
We disabled the check of NO_PRESENCE bit of the default pin-config
in commit f4419172 temporarily.  One problem was that the first
implementation was wrong -- the bit after the shift must be checked.
However, this would still give many regressions on machines with broken
BIOS.  They set this bit wrongly even on active pins.

A workaround is to check whether all pins contain this bit.  As far as
I've checked, broken BIOSen set this bit on all pins, no matter whether
active or not.  In such a case, the driver should ignore this bit check.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-11-10 12:36:46 +01:00
Takashi Iwai
f441917256 ALSA: hda - Revert the check of NO_PRESENCE pincfg default bit
The implementation on commit [08a1f5eb: ALSA: hda - Check NO_PRESENCE
pincfg default bit] seems like a mis-interpretation of specification.
The spec gives the reversed bit definition.  But, following the spec
also causes to change so many existing device configurations, thus we
can't change it so easily for now.  For 3.2-rc1, it's safer to revert
this check (actually this patch comments out the code).

We may re-introduced the fixed version once after the wider test-case
coverages are done.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-11-06 14:07:37 +01:00
Takashi Iwai
08a1f5eb43 ALSA: hda - Check NO_PRESENCE pincfg default bit
HD-audio spec defines a bit in pin default configuration for indicating
that the pin isn't used for jack-detection although the codec is capable
of it.  Better to check this bit as well in jack_is_detectable() helper
function.

Reported-by: Raymond Yau <superquad.vortex2@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-11-02 07:46:19 +01:00
Takashi Iwai
527e4d73af ALSA: hda/realtek - Fix missing volume controls with ALC260
ALC260 has multiple mixer widgets connected to the shared DAC, but the
driver currently doesn't check this possibility and ignores when the DAC
is shared with others.  This resulted in the silent output from some
routes because of lack of the amp setup.

This patch adds the workaround for it by checking the route even with the
shared DAC, but also checking the conflict with the existing control for
the very same widget NID.

Reference: https://bugzilla.novell.com/show_bug.cgi?id=726812

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-10-27 16:58:00 +02:00
Takashi Iwai
f71ff0d713 ALSA: hda - Moved snd_print_pcm_rates() back into hda_proc.c
Since hda_proc.c is now the only user of snd_print_pcm_rates(), better to
put it back locally to hda_proc.c and revert to the old style.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-10-06 08:21:15 +02:00
Pierre-Louis Bossart
14bc52b8fe ALSA: hda/hdmi: expose ELD control
Applications may want to read ELD information to
understand what codecs are supported on the HDMI
receiver and handle the a-v delay for better lip-sync.

ELD information is exposed in a device-specific
IFACE_PCM kcontrol. Tested both with amixer and
PulseAudio; with a corresponding patch passthrough modes
are enabled automagically.

ELD control size is set to zero in case of errors or
wrong configurations. No notifications are implemented
for now, it is expected that jack detection is used to
reconfigure the audio outputs.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-10-03 15:48:12 +02:00
Takashi Iwai
a06dbfc2cf ALSA: hda - Add multi-headphone NIDs in multiout struct
For supporting both the multiple headphones and the multiple speakers,
add the new field in struct hda_multi_out, and evaluate in the standard
setup functions.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-08-23 18:16:13 +02:00
Takashi Iwai
d025febcd8 ALSA: hda - Rename to snd_hda_parse_pin_defcfg()
... and add a new bit-flags argument to specify the behavior of the
function.  The older function is kept as is (as a wrapper).

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-08-23 15:24:39 +02:00
Takashi Iwai
f57c25650b ALSA: hda - Add snd_hda_override_pin_caps() helper function
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-08-15 12:49:07 +02:00
Takashi Iwai
2a43952a99 ALSA: hda - Make CONFIG_SND_HDA_POWER_SAVE depending on CONFIG_PM
It makes little sense to enable power-saving without PM.
This removes SND_HDA_NEEDS_RESUME define so that we can use CONFIG_PM
in all places.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-07-26 17:21:18 +02:00
Stephen Rothwell
880a050f4a ALSA: hda - remove SND_HDA_POWER_SAVE protection of struct hda_loopback_check
to fix build problems when it is disabled.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-06-28 08:55:56 +02:00
Stephen Warren
2def8172c6 ALSA: hda: hdmi_eld_update_pcm_info: update a stream in place
A future change won't store an entire hda_pcm_stream just to represent
the capabilities of a codec; a custom data-structure will be used. To
ease that transition, modify hdmi_eld_update_pcm_info to expect the
hda_pcm_stream to be pre-initialized with the codec's capabilities, and
to update those capabilities in-place based on the ELD.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-06-06 12:58:09 +02:00
Stephen Warren
74b654c957 ALSA: hda: Virtualize SPDIF out controls
The SPDIF output controls apply to converter widgets. A future change
will create a PCM device per pin widget, and hence a set of SPDIF output
controls per pin widget, for certain HDMI codecs. To support this, we
need the ability to virtualize the SPDIF output controls. Specifically:

* Controls can be "unassigned" from real hardware when a converter is
  not used for the PCM the control was created for.
* Control puts only write to hardware when they are assigned.
* Controls can be "assigned" to real hardware when a converter is picked
  to support output for a particular PCM.
* When a converter is assigned, the hardware is updated to the cached
  configuration.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-06-06 12:51:59 +02:00
Takashi Iwai
e35d9d6a15 ALSA: hda - Check unsol-cap in is_jack_detectalbe()
Also replace more open-codes with this function.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2011-05-17 12:33:27 +02:00