The Greybus audio source files included no copyright statements.
Add them.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Avoid the need for all the source files to include "gpbridge.h"
by just having "greybus.h" include it.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Currently, the audio driver unconditionally sets the I2S
configuration to have a sample rate of 48KHz, two channels,
16 bits per channel, in little endian order. Make this
more flexible by setting the I2S configuration according to
the arguments passed to the PCM 'hw_params' callback.
To accomplish this, query for the supported I2S configurations
at Greybus protocol init time and save them in the 'snd_dev'
structure. When the 'hw_params' callback is called, compare its
arguments to the table of supported configurations. If there is
a match, set the I2S connection accordingly.
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Acked-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Currently, the audio driver activates & deactivates a predefined
CPort ID but that can vary depending on the manifest data of the
module. Instead, use the TX connection's Bundle CPort ID which
contains the correct CPort ID.
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Acked-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Currently, the I2S TX CPort is configured and activated during
the Greybus audio initialization. Unfortunately, this prevents
the audio driver from ever changing the I2S configuration.
To allow the I2S configuration to change according to ASOC requests,
move the CPort activation & deactivation to the audio-pcm workqueue.
Now, when audio is running but the CPort is not active, it will be
activated. When audio is not running and the CPort is active, it
will be deactivated.
This has the side-effect of sending the first piece of audio data
immediately after activating the CPort which is really how it should
work anyway.
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Acked-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Add the I2C device node for the rt5647 codec.
Eventually, this will be done automatically somewhere
else but for now its done in the audio driver.
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Acked-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Instead of using the fixed suffix, '6-001b', in the
codec name, generate it from the I2S adapter number
and I2C address of the codec.
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Acked-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
The greybus code requires that an operation's response buffer be
the exact size of the response; however, the size of the response to
the GB_I2S_MGMT_TYPE_GET_SUPPORTED_CONFIGURATIONS operation is unknown.
To fix this, an extension to the I2S specification is required.
In the meantime, set the number of configurations returned to 20
because that is how many configurations will be returned (using
"insider knowledge" of the firmware).
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Tested-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
So here's the current greybus audio driver, which I
wanted to send out for more serious review and
consideration for merging.
I've tried to integrate much of the feedback from the
last round and most of the hotplug issues that I've found
have been resolved. I've tested this via gbsim, and the
Android ARA HAL layer seems to work with it.
Mark has also successfully played audio with this driver,
adding a few hacks to get the codec's i2c connection to
probe.
Current issues:
* Hotplug problem - When gbsim is killed, or the module
removed, the greybus driver gets stuck since the android
mediaserver process is holding the audio device open.
Killing the mediaserver allows things to clean up and
allows greybus to accept new gbsim connections. I have
a workaround patch to the soc-core.c logic which converts
the snd_card_free() call to snd_card_free_when_closed()
which allows the greybus connection cleanup to finish.
Remaining todos:
* Probably need to break apart the mgmt_setup function
to integrate better with the constraint logic. I took
a really basic stab at this, but more is probably
needed.
* Figure out how to properly find and tie in the
codec's I2C bus-id to the driver.
This code requires that the kernel support the following
config options, which I've enabled in a separate kernel
patch:
CONFIG_SND_SIMPLE_CARD
CONFIG_SND_SOC_SPDIF
CONFIG_SND_SOC_RT5645
I really can't calim to be the sole author of this, since
many many fixes and tweaks that have been folded in have
come from Mark Greer. His analsysis and debugging is really
what has made this dummy-framework driver evolve into an
actual audio driver. So much credit and thanks to Mark!
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
