ENGR00218421-2 ESAI_ASRC:Add support for p2p virtual device playback

In the origin code, ESAI driver supoprt audio p2p playback by setting
input PCM data's sample rate thought amixer interface.It is ugly and
request user application call amixer control interface everytime before
and playback.

In this patch, user can call the audio p2p playback by writing data to
an special virtual device. Driver would automatically get the params of
input PCM. At the same time, driver would get the output sample rate and
word data. With the data abover, driver can  set ASRC properly and audio
p2p palyback is support.

This patch mainly focus on:
	1 clean old p2p playback way for ESAI.
	2 Setup the output sample rate and word width to virtual
	device's substream_runtime's private data. Everytime the virtual
	device is called, the data abover is used for config ASRC, ESAI,
	and codec.

Signed-off-by: Chen Liangjun <b36089@freescale.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/mxc_asrc.h b/include/linux/mxc_asrc.h
index 72556a5e1669..081fafa65ab0 100644
--- a/include/linux/mxc_asrc.h
+++ b/include/linux/mxc_asrc.h
@@ -190,6 +190,11 @@ struct dma_block {
 	struct list_head queue;
 };
 
+struct asrc_p2p_params {
+	u32 p2p_rate;/* ASRC output rate for p2p */
+	enum asrc_word_width p2p_width;/* ASRC output wordwidth for p2p */
+};
+
 struct asrc_pair_params {
 	enum asrc_pair_index index;
 	struct list_head input_queue;