[alsa-devel] [PATCH v2] ASoC: wm8580: Use snd_soc_update_bits for read-modify-write

[Axel Lin]

Use snd_soc_update_bits for read-modify-write register access instead of
open-coding it using snd_soc_read and snd_soc_write

Signed-off-by: Axel Lin <axel.lin at gmail.com>
---
v2: Fix below build warning:
  CC      sound/soc/codecs/wm8580.o
sound/soc/codecs/wm8580.c: In function 'wm8580_set_bias_level':
sound/soc/codecs/wm8580.c:749: warning: unused variable 'reg'

 sound/soc/codecs/wm8580.c |   22 +++++++++-------------
 1 files changed, 9 insertions(+), 13 deletions(-)

diff --git a/sound/soc/codecs/wm8580.c b/sound/soc/codecs/wm8580.c
index b256727..8212b3c 100644
--- a/sound/soc/codecs/wm8580.c
+++ b/sound/soc/codecs/wm8580.c
@@ -430,8 +430,7 @@ static int wm8580_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
 	/* Always disable the PLL - it is not safe to leave it running
 	 * while reprogramming it.
 	 */
-	reg = snd_soc_read(codec, WM8580_PWRDN2);
-	snd_soc_write(codec, WM8580_PWRDN2, reg | pwr_mask);
+	snd_soc_update_bits(codec, WM8580_PWRDN2, pwr_mask, pwr_mask);
 
 	if (!freq_in || !freq_out)
 		return 0;
@@ -449,8 +448,7 @@ static int wm8580_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
 	snd_soc_write(codec, WM8580_PLLA4 + offset, reg);
 
 	/* All done, turn it on */
-	reg = snd_soc_read(codec, WM8580_PWRDN2);
-	snd_soc_write(codec, WM8580_PWRDN2, reg & ~pwr_mask);
+	snd_soc_update_bits(codec, WM8580_PWRDN2, pwr_mask, 0);
 
 	return 0;
 }
@@ -748,7 +746,6 @@ static int wm8580_digital_mute(struct snd_soc_dai *codec_dai, int mute)
 static int wm8580_set_bias_level(struct snd_soc_codec *codec,
 	enum snd_soc_bias_level level)
 {
-	u16 reg;
 	switch (level) {
 	case SND_SOC_BIAS_ON:
 	case SND_SOC_BIAS_PREPARE:
@@ -757,20 +754,19 @@ static int wm8580_set_bias_level(struct snd_soc_codec *codec,
 	case SND_SOC_BIAS_STANDBY:
 		if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
 			/* Power up and get individual control of the DACs */
-			reg = snd_soc_read(codec, WM8580_PWRDN1);
-			reg &= ~(WM8580_PWRDN1_PWDN | WM8580_PWRDN1_ALLDACPD);
-			snd_soc_write(codec, WM8580_PWRDN1, reg);
+			snd_soc_update_bits(codec, WM8580_PWRDN1,
+					    WM8580_PWRDN1_PWDN |
+					    WM8580_PWRDN1_ALLDACPD, 0);
 
 			/* Make VMID high impedance */
-			reg = snd_soc_read(codec,  WM8580_ADC_CONTROL1);
-			reg &= ~0x100;
-			snd_soc_write(codec, WM8580_ADC_CONTROL1, reg);
+			snd_soc_update_bits(codec, WM8580_ADC_CONTROL1,
+					    0x100, 0);
 		}
 		break;
 
 	case SND_SOC_BIAS_OFF:
-		reg = snd_soc_read(codec, WM8580_PWRDN1);
-		snd_soc_write(codec, WM8580_PWRDN1, reg | WM8580_PWRDN1_PWDN);
+		snd_soc_update_bits(codec, WM8580_PWRDN1,
+				    WM8580_PWRDN1_PWDN, WM8580_PWRDN1_PWDN);
 		break;
 	}
 	codec->dapm.bias_level = level;
-- 
1.7.4.1