ASoC: cs42l42: Export regmap elements to core namespace

Export the regmap callbacks for indicating readable/volatile registers,
also the range structure, to the CS42L42 core namespace. This is in
advance of reusing these bits in a CS42L83 driver frontend.
Signed-off-by: Martin Povišer <povik+lin@cutebit.org>
Link: https://lore.kernel.org/r/20220915094444.11434-9-povik+lin@cutebit.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/cs42l42.c

@@ -171,7 +171,7 @@ static const struct reg_default cs42l42_reg_defaults[] = {
 	{ CS42L42_ASP_RX_DAI1_CH2_BIT_LSB,	0x00 },
 };
 
-static bool cs42l42_readable_register(struct device *dev, unsigned int reg)
+bool cs42l42_readable_register(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case CS42L42_PAGE_REGISTER:
@@ -330,8 +330,9 @@ static bool cs42l42_readable_register(struct device *dev, unsigned int reg)
 		return false;
 	}
 }
+EXPORT_SYMBOL_NS_GPL(cs42l42_readable_register, SND_SOC_CS42L42_CORE);
 
-static bool cs42l42_volatile_register(struct device *dev, unsigned int reg)
+bool cs42l42_volatile_register(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case CS42L42_DEVID_AB:
@@ -362,8 +363,9 @@ static bool cs42l42_volatile_register(struct device *dev, unsigned int reg)
 		return false;
 	}
 }
+EXPORT_SYMBOL_NS_GPL(cs42l42_volatile_register, SND_SOC_CS42L42_CORE);
 
-static const struct regmap_range_cfg cs42l42_page_range = {
+const struct regmap_range_cfg cs42l42_page_range = {
 	.name = "Pages",
 	.range_min = 0,
 	.range_max = CS42L42_MAX_REGISTER,
@@ -373,6 +375,7 @@ static const struct regmap_range_cfg cs42l42_page_range = {
 	.window_start = 0,
 	.window_len = 256,
 };
+EXPORT_SYMBOL_NS_GPL(cs42l42_page_range, SND_SOC_CS42L42_CORE);
 
 const struct regmap_config cs42l42_regmap = {
 	.reg_bits = 8,

sound/soc/codecs/cs42l42.h

@@ -52,10 +52,14 @@ struct  cs42l42_private {
 	bool init_done;
 };
 
+extern const struct regmap_range_cfg cs42l42_page_range;
 extern const struct regmap_config cs42l42_regmap;
 extern const struct snd_soc_component_driver cs42l42_soc_component;
 extern struct snd_soc_dai_driver cs42l42_dai;
 
+bool cs42l42_readable_register(struct device *dev, unsigned int reg);
+bool cs42l42_volatile_register(struct device *dev, unsigned int reg);
+
 int cs42l42_suspend(struct device *dev);
 int cs42l42_resume(struct device *dev);
 void cs42l42_resume_restore(struct device *dev);