ASoC: adau17x1: Cleanup manual bias level transitions

Set the CODEC driver's suspend_bias_off flag rather than manually going to
SND_SOC_BIAS_OFF in suspend and SND_SOC_BIAS_STANDBY in resume. This makes
the code a bit shorter and cleaner.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/adau1761.c

@@ -714,9 +714,9 @@ static int adau1761_codec_probe(struct snd_soc_codec *codec)
 
 static const struct snd_soc_codec_driver adau1761_codec_driver = {
 	.probe = adau1761_codec_probe,
-	.suspend = adau17x1_suspend,
 	.resume	= adau17x1_resume,
 	.set_bias_level	= adau1761_set_bias_level,
+	.suspend_bias_off = true,
 
 	.controls = adau1761_controls,
 	.num_controls = ARRAY_SIZE(adau1761_controls),

sound/soc/codecs/adau1781.c

@@ -446,9 +446,9 @@ static int adau1781_codec_probe(struct snd_soc_codec *codec)
 
 static const struct snd_soc_codec_driver adau1781_codec_driver = {
 	.probe = adau1781_codec_probe,
-	.suspend = adau17x1_suspend,
 	.resume = adau17x1_resume,
 	.set_bias_level = adau1781_set_bias_level,
+	.suspend_bias_off = true,
 
 	.controls = adau1781_controls,
 	.num_controls = ARRAY_SIZE(adau1781_controls),

sound/soc/codecs/adau17x1.c

@@ -815,13 +815,6 @@ int adau17x1_add_routes(struct snd_soc_codec *codec)
 }
 EXPORT_SYMBOL_GPL(adau17x1_add_routes);
 
-int adau17x1_suspend(struct snd_soc_codec *codec)
-{
-	codec->driver->set_bias_level(codec, SND_SOC_BIAS_OFF);
-	return 0;
-}
-EXPORT_SYMBOL_GPL(adau17x1_suspend);
-
 int adau17x1_resume(struct snd_soc_codec *codec)
 {
 	struct adau *adau = snd_soc_codec_get_drvdata(codec);
@@ -829,7 +822,6 @@ int adau17x1_resume(struct snd_soc_codec *codec)
 	if (adau->switch_mode)
 		adau->switch_mode(codec->dev);
 
-	codec->driver->set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 	regcache_sync(adau->regmap);
 
 	return 0;

sound/soc/codecs/adau17x1.h

@@ -52,7 +52,6 @@ int adau17x1_set_micbias_voltage(struct snd_soc_codec *codec,
 	enum adau17x1_micbias_voltage micbias);
 bool adau17x1_readable_register(struct device *dev, unsigned int reg);
 bool adau17x1_volatile_register(struct device *dev, unsigned int reg);
-int adau17x1_suspend(struct snd_soc_codec *codec);
 int adau17x1_resume(struct snd_soc_codec *codec);
 
 extern const struct snd_soc_dai_ops adau17x1_dai_ops;