ASoC: ak4535: 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.

Since the ASoC core now takes care of setting the bias level to
SND_SOC_BIAS_OFF when removing the CODEC there is no need to do it manually
anymore either.

The manual transition to SND_SOC_BIAS_STANDBY at the end of CODEC probe()
can also be removed as the core will automatically do this after the CODEC
has been probed.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/ak4535.c

@@ -373,36 +373,19 @@ static struct snd_soc_dai_driver ak4535_dai = {
 	.ops = &ak4535_dai_ops,
 };
 
-static int ak4535_suspend(struct snd_soc_codec *codec)
-{
-	ak4535_set_bias_level(codec, SND_SOC_BIAS_OFF);
-	return 0;
-}
-
 static int ak4535_resume(struct snd_soc_codec *codec)
 {
 	snd_soc_cache_sync(codec);
-	ak4535_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 	return 0;
 }
 
 static int ak4535_probe(struct snd_soc_codec *codec)
 {
-	/* power on device */
-	ak4535_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
-
 	snd_soc_add_codec_controls(codec, ak4535_snd_controls,
 				ARRAY_SIZE(ak4535_snd_controls));
 	return 0;
 }
 
-/* power down chip */
-static int ak4535_remove(struct snd_soc_codec *codec)
-{
-	ak4535_set_bias_level(codec, SND_SOC_BIAS_OFF);
-	return 0;
-}
-
 static const struct regmap_config ak4535_regmap = {
 	.reg_bits = 8,
 	.val_bits = 8,
@@ -417,10 +400,10 @@ static const struct regmap_config ak4535_regmap = {
 
 static struct snd_soc_codec_driver soc_codec_dev_ak4535 = {
 	.probe =	ak4535_probe,
-	.remove =	ak4535_remove,
-	.suspend =	ak4535_suspend,
 	.resume =	ak4535_resume,
 	.set_bias_level = ak4535_set_bias_level,
+	.suspend_bias_off = true,
+
 	.dapm_widgets = ak4535_dapm_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(ak4535_dapm_widgets),
 	.dapm_routes = ak4535_audio_map,