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authorJanusz Krzysztofik <jkrzyszt@tis.icnet.pl>2011-12-30 04:04:54 +0100
committerLiam Girdwood <lrg@ti.com>2012-01-09 11:20:16 +0000
commitf75a8ff67d161b5166a2c2360bb2ffaefd5eb853 (patch)
treedfba447099152b8deae514492e0e1e2a7bcd87cc /sound
parentb425b88418e302caf27e9cf44aa987b83c04cb2d (diff)
ASoC: cx20442: add bias control over a platform provided regulator
Now that a regulator device for controlling the codec chip reset state over a platform agnostic regulator API is available on the only board using this driver so far, extend the driver with a bias control function which will request virtual power to the codec chip from that virtual regulator, and will supersede the present implementation existing at the sound card level. Thanks to the regulator sharing mechanism, both the old (the sound card) and the new (the codec) implementations should coexist smoothly until the sound card file is updated. For this to work as expected, update the sound card .set_bias_level callback to not touch codec->dapm.bias_level. While extending the cx20442 structure, drop unused control_type member. Created against linxu-3.2-rc6, tested on top of patch 1/4 "ARM: OMAP1: ams-delta: set up a regulator over the modem reset GPIO pin". Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lrg@ti.com>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/codecs/cx20442.c48
-rw-r--r--sound/soc/omap/ams-delta.c8
2 files changed, 49 insertions, 7 deletions
diff --git a/sound/soc/codecs/cx20442.c b/sound/soc/codecs/cx20442.c
index ae55e31bfc7..d5fd00a6474 100644
--- a/sound/soc/codecs/cx20442.c
+++ b/sound/soc/codecs/cx20442.c
@@ -16,6 +16,7 @@
#include <linux/tty.h>
#include <linux/slab.h>
#include <linux/module.h>
+#include <linux/regulator/consumer.h>
#include <sound/core.h>
#include <sound/initval.h>
@@ -25,8 +26,8 @@
struct cx20442_priv {
- enum snd_soc_control_type control_type;
void *control_data;
+ struct regulator *por;
};
#define CX20442_PM 0x0
@@ -324,6 +325,38 @@ static struct snd_soc_dai_driver cx20442_dai = {
},
};
+static int cx20442_set_bias_level(struct snd_soc_codec *codec,
+ enum snd_soc_bias_level level)
+{
+ struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
+ int err = 0;
+
+ switch (level) {
+ case SND_SOC_BIAS_PREPARE:
+ if (codec->dapm.bias_level != SND_SOC_BIAS_STANDBY)
+ break;
+ if (IS_ERR(cx20442->por))
+ err = PTR_ERR(cx20442->por);
+ else
+ err = regulator_enable(cx20442->por);
+ break;
+ case SND_SOC_BIAS_STANDBY:
+ if (codec->dapm.bias_level != SND_SOC_BIAS_PREPARE)
+ break;
+ if (IS_ERR(cx20442->por))
+ err = PTR_ERR(cx20442->por);
+ else
+ err = regulator_disable(cx20442->por);
+ break;
+ default:
+ break;
+ }
+ if (!err)
+ codec->dapm.bias_level = level;
+
+ return err;
+}
+
static int cx20442_codec_probe(struct snd_soc_codec *codec)
{
struct cx20442_priv *cx20442;
@@ -331,9 +364,13 @@ static int cx20442_codec_probe(struct snd_soc_codec *codec)
cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
if (cx20442 == NULL)
return -ENOMEM;
- snd_soc_codec_set_drvdata(codec, cx20442);
+ cx20442->por = regulator_get(codec->dev, "POR");
+ if (IS_ERR(cx20442->por))
+ dev_warn(codec->dev, "failed to get the regulator");
cx20442->control_data = NULL;
+
+ snd_soc_codec_set_drvdata(codec, cx20442);
codec->hw_write = NULL;
codec->card->pop_time = 0;
@@ -350,6 +387,12 @@ static int cx20442_codec_remove(struct snd_soc_codec *codec)
tty_hangup(tty);
}
+ if (!IS_ERR(cx20442->por)) {
+ /* should be already in STANDBY, hence disabled */
+ regulator_put(cx20442->por);
+ }
+
+ snd_soc_codec_set_drvdata(codec, NULL);
kfree(cx20442);
return 0;
}
@@ -359,6 +402,7 @@ static const u8 cx20442_reg;
static struct snd_soc_codec_driver cx20442_codec_dev = {
.probe = cx20442_codec_probe,
.remove = cx20442_codec_remove,
+ .set_bias_level = cx20442_set_bias_level,
.reg_cache_default = &cx20442_reg,
.reg_cache_size = 1,
.reg_word_size = sizeof(u8),
diff --git a/sound/soc/omap/ams-delta.c b/sound/soc/omap/ams-delta.c
index 3e523a7a9ef..a67f4370bc9 100644
--- a/sound/soc/omap/ams-delta.c
+++ b/sound/soc/omap/ams-delta.c
@@ -431,22 +431,20 @@ static int ams_delta_set_bias_level(struct snd_soc_card *card,
struct snd_soc_dapm_context *dapm,
enum snd_soc_bias_level level)
{
- struct snd_soc_codec *codec = card->rtd->codec;
-
switch (level) {
case SND_SOC_BIAS_ON:
case SND_SOC_BIAS_PREPARE:
case SND_SOC_BIAS_STANDBY:
- if (codec->dapm.bias_level == SND_SOC_BIAS_OFF)
+ if (card->dapm.bias_level == SND_SOC_BIAS_OFF)
ams_delta_latch2_write(AMS_DELTA_LATCH2_MODEM_NRESET,
AMS_DELTA_LATCH2_MODEM_NRESET);
break;
case SND_SOC_BIAS_OFF:
- if (codec->dapm.bias_level != SND_SOC_BIAS_OFF)
+ if (card->dapm.bias_level != SND_SOC_BIAS_OFF)
ams_delta_latch2_write(AMS_DELTA_LATCH2_MODEM_NRESET,
0);
}
- codec->dapm.bias_level = level;
+ card->dapm.bias_level = level;
return 0;
}