[Sound-open-firmware] [PATCH 3/5] DMIC: add empty get_loopback_mode function

[Xiuli Pan]

From: Pan Xiuli <xiuli.pan at linux.intel.com>

Return error value if it is called.

Signed-off-by: Pan Xiuli <xiuli.pan at linux.intel.com>
---
Work with patch set:
SOF-Kernel(6):
  ASoC: SOF: Add debug_mode flag in sof dev
  ASoC: SOF: debug: add debugmode debugfs for sof_dev debug_mode
  ASoC: SOF: uapi: topology: Add SOF_TKN_DAI_SSP_LBM for ssp loopback mode
  ASoC: SOF: add headers for lbm control callback functions
  ASoC: SOF: add lbm kcontrol callback functions
  ASoC: SOF: topology: Add topology handler for dai ssp loopback mode

SOF(5):
  dai: add lbm status for dai ssp
  dai: add get_loopback_mode function
  DMIC: add empty get_loopback_mode function
  SSP: support for get/set_loopback_mode functions
  dai: add dai_cmd support for loopback mode switch

SOF-Tools(3):
  topology: Add SOF_TKN_DAI_SSP_LBM for ssp loopback mode
  topology: m4: Add DAI_OUT_SSP_LOOPBACK marco for SSP LOOPBACK dai comp
  topology: test: Add loopback topology

test & santity test with:
Mininow max rt5651 and UP2 Hifiberry PRO and CNL nocodec
SOF master: 48d2a1c551d7b3c8f76d44f3c04dd59a37ff6a8f
SOF-Tool master: bd7dc88231f31d385340310cef467f211a739eeb
https://github.com/plbossart/sound/tree/topic/sof-v4.14:
0d51a5ed28c5e97f09b59c4cafaddfb9d3b24b77
---
 src/drivers/dmic.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/drivers/dmic.c b/src/drivers/dmic.c
index 97ca8b2..14dc0f5 100644
--- a/src/drivers/dmic.c
+++ b/src/drivers/dmic.c
@@ -1353,6 +1353,11 @@ static inline int dmic_set_loopback_mode(struct dai *dai, uint32_t lbm)
 	return -EINVAL;
 }
 
+static inline int dmic_get_loopback_mode(struct dai *dai)
+{
+	return -EINVAL;
+}
+
 const struct dai_ops dmic_ops = {
 	.trigger = dmic_trigger,
 	.set_config = dmic_set_config,
@@ -1360,6 +1365,7 @@ const struct dai_ops dmic_ops = {
 	.pm_context_restore = dmic_context_restore,
 	.probe = dmic_probe,
 	.set_loopback_mode = dmic_set_loopback_mode,
+	.get_loopback_mode = dmic_get_loopback_mode,
 };
 
 #endif
-- 
2.7.4