Hello, all! This is the syncup version of the sound protocol changes for Linux Kernel with the only difference from the corresponding Xen version being spaces to tabs conversion. Regradless of this only change I have dropped R-b tags received for Xen version.
In order to provide explicit synchronization between backend and frontend the following changes are introduced in the protocol: - bump protocol version to 2 - add new ring buffer for sending asynchronous events from backend to frontend to report number of bytes played by the frontend (XENSND_EVT_CUR_POS) - introduce trigger events for playback control: start/stop/pause/resume - add "req-" prefix to event-channel and ring-ref to unify naming of the Xen event channels for requests and events - add XENSND_OP_HW_PARAM_QUERY request to read/update stream configuration space: request passes desired intervals/formats for the stream parameters and the response returns allowed intervals and formats mask that can be used. - MAJOR: changed req/resp/evt packet sizes from 32 to 64 octets - Reworked XENSND_OP_HW_PARAM_QUERY so it now sends all parameters at once, allowing to check all the configuration space. - Minor documentation cleanup (added missed "reserved" fields) Oleksandr Andrushchenko (5): xen/sndif: Introduce protocol version xen/sndif: Fix missed "reserved" fields in comments xen/sndif: Make requests and responses 64 octets long xen/sndif: Add explicit back and front synchronization xen/sndif: Add explicit back and front parameter negotiation include/xen/interface/io/sndif.h | 322 +++++++++++++++++++++++++++++-- 1 file changed, 306 insertions(+), 16 deletions(-) -- 2.17.0