[PATCH v2 20/26] ASoC: cs35l41: Add common cs35l41 enter hibernate function

[Vitaly Rodionov <vitalyr@opensource.cirrus.com>]

From: Stefan Binding <sbinding@opensource.cirrus.com>

Since the CS35L41 HDA driver also support hibernation, it
makes sense to move code from the ASoC driver to enter
hibernation into common code.

Since HDA must support laptops which do not support hibernation
due to lack of external boost GPIO it is necessary to
ensure the function returns an error when an unsupported
boost type is in use.

Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>

Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
Signed-off-by: Vitaly Rodionov <vitalyr@opensource.cirrus.com>
---
 include/sound/cs35l41.h        |  2 ++
 sound/soc/codecs/cs35l41-lib.c | 19 +++++++++++++++++++
 sound/soc/codecs/cs35l41.c     | 10 +---------
 3 files changed, 22 insertions(+), 9 deletions(-)

diff --git a/include/sound/cs35l41.h b/include/sound/cs35l41.h
index f848ba1e75b3..9ac5918269a5 100644
--- a/include/sound/cs35l41.h
+++ b/include/sound/cs35l41.h
@@ -885,6 +885,8 @@ void cs35l41_configure_cs_dsp(struct device *dev, struct regmap *reg, struct cs_
 int cs35l41_set_cspl_mbox_cmd(struct device *dev, struct regmap *regmap,
 			      enum cs35l41_cspl_mbox_cmd cmd);
 int cs35l41_write_fs_errata(struct device *dev, struct regmap *regmap);
+int cs35l41_enter_hibernate(struct device *dev, struct regmap *regmap,
+			    enum cs35l41_boost_type b_type);
 int cs35l41_exit_hibernate(struct device *dev, struct regmap *regmap);
 int cs35l41_init_boost(struct device *dev, struct regmap *regmap,
 		       struct cs35l41_hw_cfg *hw_cfg);
diff --git a/sound/soc/codecs/cs35l41-lib.c b/sound/soc/codecs/cs35l41-lib.c
index e726a38f1997..0c7d1c791279 100644
--- a/sound/soc/codecs/cs35l41-lib.c
+++ b/sound/soc/codecs/cs35l41-lib.c
@@ -1322,6 +1322,25 @@ int cs35l41_write_fs_errata(struct device *dev, struct regmap *regmap)
 }
 EXPORT_SYMBOL_GPL(cs35l41_write_fs_errata);
 
+int cs35l41_enter_hibernate(struct device *dev, struct regmap *regmap,
+			    enum cs35l41_boost_type b_type)
+{
+	if (!cs35l41_safe_reset(regmap, b_type)) {
+		dev_dbg(dev, "System does not support Suspend\n");
+		return -EINVAL;
+	}
+
+	dev_dbg(dev, "Enter hibernate\n");
+	regmap_write(regmap, CS35L41_WAKESRC_CTL, 0x0088);
+	regmap_write(regmap, CS35L41_WAKESRC_CTL, 0x0188);
+
+	// Don't wait for ACK since bus activity would wake the device
+	regmap_write(regmap, CS35L41_DSP_VIRT1_MBOX_1, CSPL_MBOX_CMD_HIBERNATE);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(cs35l41_enter_hibernate);
+
 static void cs35l41_wait_for_pwrmgt_sts(struct device *dev, struct regmap *regmap)
 {
 	const int pwrmgt_retries = 10;
diff --git a/sound/soc/codecs/cs35l41.c b/sound/soc/codecs/cs35l41.c
index 0400c6e091d5..ca8310a77092 100644
--- a/sound/soc/codecs/cs35l41.c
+++ b/sound/soc/codecs/cs35l41.c
@@ -1333,15 +1333,7 @@ static int __maybe_unused cs35l41_runtime_suspend(struct device *dev)
 	if (!cs35l41->dsp.preloaded || !cs35l41->dsp.cs_dsp.running)
 		return 0;
 
-	dev_dbg(cs35l41->dev, "Enter hibernate\n");
-
-	cs35l41_safe_reset(cs35l41->regmap, cs35l41->hw_cfg.bst_type);
-	regmap_write(cs35l41->regmap, CS35L41_WAKESRC_CTL, 0x0088);
-	regmap_write(cs35l41->regmap, CS35L41_WAKESRC_CTL, 0x0188);
-
-	// Don't wait for ACK since bus activity would wake the device
-	regmap_write(cs35l41->regmap, CS35L41_DSP_VIRT1_MBOX_1,
-		     CSPL_MBOX_CMD_HIBERNATE);
+	cs35l41_enter_hibernate(dev, cs35l41->regmap, cs35l41->hw_cfg.bst_type);
 
 	regcache_cache_only(cs35l41->regmap, true);
 	regcache_mark_dirty(cs35l41->regmap);
-- 
2.34.1