1. 20 Sep, 2018 1 commit
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    • Oleksandr Andrushchenko's avatar
      ALSA: xen-front: Implement ALSA virtual sound driver · 1cee5593
      Oleksandr Andrushchenko authored
      Implement essential initialization of the sound driver:
        - introduce required data structures
        - handle driver registration
        - handle sound card registration
        - register sound driver on backend connection
        - remove sound driver on backend disconnect
      
      Initialize virtual sound card with streams according to the
      Xen store configuration.
      
      Implement ALSA driver operations including:
        - manage frontend/backend shared buffers
        - manage Xen bus event channel states
      
      Implement requests from front to back for ALSA
      PCM operations.
        - report ALSA period elapsed event: handle XENSND_EVT_CUR_POS
          notifications from the backend when stream position advances
          during playback/capture. The event carries a value of how
          many octets were played/captured at the time of the event.
        - implement explicit stream parameter negotiation between
          backend and frontend: handle XENSND_OP_HW_PARAM_QUERY request
          to read/update configuration space for the parameter given:
          request passes desired parameter interval and the response to
          this request returns min/max interval for the parameter to be used.
      Signed-off-by: default avatarOleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
      Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      1cee5593