27 Sep, 2011
1 commit
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There are certain devices that are reportedly so slow that they need
more than 100 ms to handle control transfers. Therefore, increase the
timeout in mixer(_quirks).c to 1000 ms.The timeout parameter of snd_usb_ctl_msg() is now constant, so we can
drop it.Reported-by: Felipe Balbi
Signed-off-by: Clemens Ladisch
Signed-off-by: Takashi Iwai
14 Sep, 2011
1 commit
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No code altered at this point, simply preparing for upcoming
refactorizations.Signed-off-by: Daniel Mack
Acked-by: Clemens Ladisch
Signed-off-by: Takashi Iwai
12 Sep, 2011
1 commit
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Existing code only updates the audio delay when URBs were
submitted/retired. This can introduce an uncertainty of 8ms
on the number of samples played out with the default settings,
and a lot more when URBs convey more packets to reduce the
interrupt rate and power consumption.This patch relies on the USB frame counter to reduce the
uncertainty to less than 2ms worst-case. The delay information
essentially becomes independent of the URB size and number of
packets. This should help applications like PulseAudio which
require accurate audio timing. Clemens Ladisch reported
a decrease of mplayer's A-V difference from nrpacks down to at
most 1ms.Thanks to Clemens for also pointing out that the implementation
of frame counters varies between different HCDs. Only the
8 lowest-bits are used to estimate the delay.Signed-off-by: Pierre-Louis Bossart
[clemens: changed debug code]
Signed-off-by: Clemens Ladisch
Signed-off-by: Takashi Iwai
11 Mar, 2011
1 commit
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Devices are autosuspended if no pcm nor midi channel is open
Mixer devices may be opened. This way they are active when
in use to play or record sound, but can be suspended while
users have a mixer application running.[Small clean-ups using static inline by tiwai]
Signed-off-by: Oliver Neukum
Signed-off-by: Takashi Iwai
23 Feb, 2011
1 commit
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When a USB audio device is disconnected, snd_usb_audio_disconnect()
kills all audio URBs. At the same time, the application, after being
notified of the disconnection, might close the device, in which case
ALSA calls the .hw_free callback, which should free the URBs too.Commit de1b8b93a0ba "[ALSA] Fix hang-up at disconnection of usb-audio"
prevented snd_usb_hw_free() from freeing the URBs to avoid a hang that
resulted from this race, but this introduced another race because the
URB callbacks could now be executed after snd_usb_hw_free() has
returned, and try to access already freed data.Fix the first race by introducing a mutex to serialize the disconnect
callback and all PCM callbacks that manage URBs (hw_free and hw_params).Reported-and-tested-by: Pierre-Louis Bossart
Cc:
[CL: also serialize hw_params callback]
Signed-off-by: Clemens Ladisch
Signed-off-by: Takashi Iwai
01 Nov, 2010
1 commit
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sound/usb/pcm.c::snd_usb_pcm_check_knot() fails to check the return value
from kmalloc() and may end up dereferencing a null pointer.
The patch below (compile tested only) should take care of that little
problem.Signed-off-by: Jesper Juhl
Signed-off-by: Takashi Iwai
27 Oct, 2010
1 commit
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There are two USB Audio Class specifications (v1 and v2), but neither of
them clearly defines the feedback format for high-speed UAC v1 devices.
Add to this whatever the Creative and M-Audio firmware writers have been
smoking, and it becomes impossible to predict the exact feedback format
used by a particular device.Therefore, automatically detect the feedback format by looking at the
magnitude of the first received feedback value.Also, this allows us to get rid of some special cases for E-Mu devices.
Signed-off-by: Clemens Ladisch
Signed-off-by: Takashi Iwai
04 Sep, 2010
2 commits
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The Audio Class v2 support code in 2.6.35 added checks for the
bInterfaceProtocol field. However, there are devices (usually those
detected by vendor-specific quirks) that do not have one of the
predefined values in this field, which made the driver reject them.To fix this regression, restore the old behaviour, i.e., assume that
a device with an unknown bInterfaceProtocol field (other than
UAC_VERSION_2) has more or less UAC-v1-compatible descriptors.[compile warning fixes by tiwai]
Signed-off-by: Clemens Ladisch
Cc: Daniel Mack
Cc:
Signed-off-by: Takashi Iwai
18 Aug, 2010
1 commit
14 Aug, 2010
1 commit
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This is V2 of the patch, after feedback from Clemens and Daniel.
This patch adds SuperSpeed support to the USB drivers under sound/. It adds
tests for USB_SPEED_SUPER to the appropriate places that check for the USB
speed.This patch has been tested with our SS USB3 device emulating a set of Yamaha
speakers and a Logitech microphone, but with the descriptors modified to add
USB3 support. It has also been tested with the real speakers and microphone,
to make sure that USB2 devices still work.Signed-off-by: Paul Zimmerman
Cc: Clemens Ladisch
Cc: Daniel Mack
Cc: Greg Kroah-Hartman
Signed-off-by: Takashi Iwai
13 Jul, 2010
1 commit
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Signed-off-by: Uwe Kleine-König
Signed-off-by: Jiri Kosina
01 Jun, 2010
1 commit
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Audio devices which comply to the UAC2 standard can export complex clock
topologies in its descriptors and set up links between them.The entities that are defined are
- clock sources, which define the end-leafs.
- clock selectors, which act as switch to select one out of many
possible clocks sources.
- clock multipliers, which have an input clock source, and act as clock
source again. They can be used to derive one clock from another.All sample rate changes, clock validity queries and the like must go to
clock source elements, while clock selectors and multipliers can be used
as terminal clock source.The following patch adds a parser for these elements and functions to
iterate over the tree and find the leaf nodes (clock sources).The samplerate set functions were moved to the new clock.c file.
Signed-off-by: Daniel Mack
Signed-off-by: Takashi Iwai
27 May, 2010
1 commit
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This request is again handled differently in comparison to UAC1.
Signed-off-by: Daniel Mack
Signed-off-by: Takashi Iwai
29 Mar, 2010
1 commit
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Signed-off-by: Stephen Rothwell
Signed-off-by: Takashi Iwai
12 Mar, 2010
1 commit
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- Split the audio.h file in two to clearly denote the differences
between the standards.
- Add many more defines to audio-v2.h. Most of them are not currently
used.
- Replaced a magic value with a proper defineSigned-off-by: Daniel Mack
Acked-by: Greg Kroah-Hartman
Cc: Clemens Ladisch
Signed-off-by: Takashi Iwai
05 Mar, 2010
4 commits
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Sample rate setting is done with a 4-byte long class request that
addresses the interface.Signed-off-by: Daniel Mack
Cc: Clemens Ladisch
Signed-off-by: Takashi Iwai -
In preparation for USB audio 2.0 support, change the audioformat
structure so that it uses a bitmask to specify possible formats.Signed-off-by: Clemens Ladisch
Signed-off-by: Takashi Iwai -
The snd_usb_substream::format field actually contains the index of the
current alternate setting, so rename it to altset_idx to avoid
confusion.Signed-off-by: Clemens Ladisch
Signed-off-by: Takashi Iwai -
Clean up the usb audio driver by factoring out a lot of functions to
separate files. Code for procfs, quirks, urbs, format parsers etc all
got a new home now.Moved almost all special quirk handling to quirks.c and introduced new
generic functions to handle them, so the exceptions do not pollute the
whole driver.Renamed usbaudio.c to card.c because this is what it actually does now.
Renamed usbmidi.c to midi.c for namespace clarity.
Removed more things from usbaudio.h.The non-standard drivers were adopted accordingly.
Signed-off-by: Daniel Mack
Cc: Clemens Ladisch
Signed-off-by: Takashi Iwai