From cf56f62746c3e2f70bfad3d6fd051427a0022368 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Wed, 3 Feb 2010 17:55:55 +0000 Subject: ASoC: Disable WM8993 regulators when turning bias off While the regulators are disabled we cache all register writes. Currently we assume that the regulator disable actually takes effect, after the merge with the regulator tree in 2.6.34 the regulator API will be able to notify us if the power is actually removed (due to constraints or regulator sharing it may not be). Signed-off-by: Mark Brown Acked-by: Liam Girdwood --- sound/soc/codecs/wm8993.c | 54 +++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 45 insertions(+), 9 deletions(-) (limited to 'sound') diff --git a/sound/soc/codecs/wm8993.c b/sound/soc/codecs/wm8993.c index e97b3f45b24..bf022f68b84 100644 --- a/sound/soc/codecs/wm8993.c +++ b/sound/soc/codecs/wm8993.c @@ -923,10 +923,33 @@ static const struct snd_soc_dapm_route routes[] = { { "Right Headphone Mux", "DAC", "DACR" }, }; +static void wm8993_cache_restore(struct snd_soc_codec *codec) +{ + u16 *cache = codec->reg_cache; + int i; + + if (!codec->cache_sync) + return; + + /* Reenable hardware writes */ + codec->cache_only = 0; + + /* Restore the register settings */ + for (i = 1; i < WM8993_MAX_REGISTER; i++) { + if (cache[i] == wm8993_reg_defaults[i]) + continue; + snd_soc_write(codec, i, cache[i]); + } + + /* We're in sync again */ + codec->cache_sync = 0; +} + static int wm8993_set_bias_level(struct snd_soc_codec *codec, enum snd_soc_bias_level level) { struct wm8993_priv *wm8993 = codec->private_data; + int ret; switch (level) { case SND_SOC_BIAS_ON: @@ -940,6 +963,13 @@ static int wm8993_set_bias_level(struct snd_soc_codec *codec, case SND_SOC_BIAS_STANDBY: if (codec->bias_level == SND_SOC_BIAS_OFF) { + ret = regulator_bulk_enable(ARRAY_SIZE(wm8993->supplies), + wm8993->supplies); + if (ret != 0) + return ret; + + wm8993_cache_restore(codec); + /* Tune DC servo configuration */ snd_soc_write(codec, 0x44, 3); snd_soc_write(codec, 0x56, 3); @@ -992,6 +1022,18 @@ static int wm8993_set_bias_level(struct snd_soc_codec *codec, snd_soc_update_bits(codec, WM8993_POWER_MANAGEMENT_1, WM8993_VMID_SEL_MASK | WM8993_BIAS_ENA, 0); + +#ifdef CONFIG_REGULATOR + /* Post 2.6.34 we will be able to get a callback when + * the regulators are disabled which we can use but + * for now just assume that the power will be cut if + * the regulator API is in use. + */ + codec->cache_sync = 1; +#endif + + regulator_bulk_disable(ARRAY_SIZE(wm8993->supplies), + wm8993->supplies); break; } @@ -1460,15 +1502,7 @@ static int wm8993_resume(struct platform_device *pdev) struct snd_soc_device *socdev = platform_get_drvdata(pdev); struct snd_soc_codec *codec = socdev->card->codec; struct wm8993_priv *wm8993 = codec->private_data; - u16 *cache = wm8993->reg_cache; - int i, ret; - - /* Restore the register settings */ - for (i = 1; i < WM8993_MAX_REGISTER; i++) { - if (cache[i] == wm8993_reg_defaults[i]) - continue; - snd_soc_write(codec, i, cache[i]); - } + int ret; wm8993_set_bias_level(codec, SND_SOC_BIAS_STANDBY); @@ -1584,6 +1618,8 @@ static int wm8993_i2c_probe(struct i2c_client *i2c, if (ret != 0) goto err_enable; + codec->cache_only = 1; + /* By default we're using the output mixers */ wm8993->class_w_users = 2; -- cgit v1.2.3