Doug / smarc-fsl-linux-kernel

14 Nov, 2012

1 commit

10 Feb, 2012

2 commits

  • 0ca548880   staging: line6: separate handling of buffer allocation and stream startup ... Browse Code »

    There are several features of the Line6 USB driver which require PCM
    data to be exchanged with the device:
    *) PCM playback and capture via ALSA
    *) software monitoring (for devices without hardware monitoring)
    *) optional impulse response measurement
    However, from the device's point of view, there is just a single
    capture and playback stream, which must be shared between these
    subsystems. It is therefore necessary to maintain the state of the
    subsystems with respect to PCM usage. We define several constants of
    the form LINE6_BIT_PCM___ with the
    following meanings:
    *) is one of
    -) ALSA: PCM playback and capture via ALSA
    -) MONITOR: software monitoring
    -) IMPULSE: optional impulse response measurement
    *) is one of
    -) PLAYBACK: audio output (from host to device)
    -) CAPTURE: audio input (from device to host)
    *) is one of
    -) BUFFER: buffer required by PCM data stream
    -) STREAM: actual PCM data stream

    The subsystems call line6_pcm_acquire() to acquire the (shared)
    resources needed for a particular operation (e.g., allocate the buffer
    for ALSA playback or start the capture stream for software monitoring).
    When a resource is no longer needed, it is released by calling
    line6_pcm_release(). Buffer allocation and stream startup are handled
    separately to allow the ALSA kernel driver to perform them at
    appropriate places (since the callback which starts a PCM stream is not
    allowed to sleep).

    Signed-off-by: Markus Grabner
    Signed-off-by: Greg Kroah-Hartman

    Markus Grabner
     
  • 3784129a9   staging: line6: removed obsolete code ... Browse Code »

    Signed-off-by: Markus Grabner
    Signed-off-by: Greg Kroah-Hartman

    Markus Grabner
     

10 Dec, 2011

1 commit

  • 153e38761   staging: line6: eliminate useless index_out variable ... Browse Code »

    Playback urbs use the index_out counter to decide which part of the
    playback buffer to use. Since the urb already has a unique index in
    range [0, LINE6_ISO_BUFFERS) there is no need to keep a separate
    counter.

    Use the urb index instead. This also eliminates the possibility of two
    urbs using the same playback buffer space if they ever complete
    out-of-order for some reason.

    Signed-off-by: Stefan Hajnoczi
    Signed-off-by: Markus Grabner
    Signed-off-by: Greg Kroah-Hartman

    Stefan Hajnoczi
     

09 Dec, 2011

1 commit

22 Sep, 2010

1 commit

01 Sep, 2010

2 commits

04 Apr, 2009

2 commits

  • a49e48383   Staging: line6: coding style cleanups for .h files. ... Browse Code »

    Mostly all line length issues.
    Skipped the control.h file as it makes sense to leave it alone.

    Cc: Markus Grabner
    Cc: Mariusz Kozlowski
    Signed-off-by: Greg Kroah-Hartman

    Greg Kroah-Hartman
     
  • 705ececd1   Staging: add line6 usb driver ... Browse Code »

    This is an experimental Linux driver for the guitar amp, cab, and
    effects modeller PODxt Pro by Line6 (and similar devices), supporting
    the following features:

    - Reading/writing individual parameters
    - Reading/writing complete channel, effects setup, and amp setup data
    - Channel switching
    - Virtual MIDI interface
    - Tuner access
    - Playback/capture/mixer device for any ALSA-compatible PCM audio
    application
    - Signal routing (record clean/processed guitar signal, re-amping)

    Moreover, preliminary support for the Variax Workbench is included.

    From: Markus Grabner
    Cc: Mariusz Kozlowski
    Signed-off-by: Greg Kroah-Hartman

    Markus Grabner