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The users of tinyalsa had no way of knowing on which subdevice a stream had been created. A new API, "unsigned int pcm_get_subdevice(struct *pcm)" returns it. This information is filled during the pcm_open() Change-Id: Ie866e10e06ce6691ede09e2ca46a24441723ea8b Signed-off-by: David Wagner <david.wagner@intel.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>