ASoC: Provide REGULATOR_SUPPLY widget type
Modern devices allow systems to enable and disable individual supplies on
the device, allowing additional power saving by switching off regulators
which power portions of the device which are not currently in use. Add a
new SND_SOC_DAPM_REGULATOR_SUPPLY widget type factoring out the code for
managing such widgets from individual drivers.
The widget name will be used as the supply name when requesting the
regulator from the regulator API.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 31a06b2..30f9b5c 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -40,6 +40,7 @@
#include <linux/jiffies.h>
#include <linux/debugfs.h>
#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
@@ -55,6 +56,7 @@
static int dapm_up_seq[] = {
[snd_soc_dapm_pre] = 0,
[snd_soc_dapm_supply] = 1,
+ [snd_soc_dapm_regulator_supply] = 1,
[snd_soc_dapm_micbias] = 2,
[snd_soc_dapm_aif_in] = 3,
[snd_soc_dapm_aif_out] = 3,
@@ -90,6 +92,7 @@
[snd_soc_dapm_value_mux] = 9,
[snd_soc_dapm_aif_in] = 10,
[snd_soc_dapm_aif_out] = 10,
+ [snd_soc_dapm_regulator_supply] = 11,
[snd_soc_dapm_supply] = 11,
[snd_soc_dapm_post] = 12,
};
@@ -352,6 +355,7 @@
case snd_soc_dapm_micbias:
case snd_soc_dapm_vmid:
case snd_soc_dapm_supply:
+ case snd_soc_dapm_regulator_supply:
case snd_soc_dapm_aif_in:
case snd_soc_dapm_aif_out:
case snd_soc_dapm_hp:
@@ -680,8 +684,13 @@
DAPM_UPDATE_STAT(widget, path_checks);
- if (widget->id == snd_soc_dapm_supply)
+ switch (widget->id) {
+ case snd_soc_dapm_supply:
+ case snd_soc_dapm_regulator_supply:
return 0;
+ default:
+ break;
+ }
switch (widget->id) {
case snd_soc_dapm_adc:
@@ -745,8 +754,13 @@
DAPM_UPDATE_STAT(widget, path_checks);
- if (widget->id == snd_soc_dapm_supply)
+ switch (widget->id) {
+ case snd_soc_dapm_supply:
+ case snd_soc_dapm_regulator_supply:
return 0;
+ default:
+ break;
+ }
/* active stream ? */
switch (widget->id) {
@@ -828,6 +842,19 @@
}
EXPORT_SYMBOL_GPL(dapm_reg_event);
+/*
+ * Handler for regulator supply widget.
+ */
+int dapm_regulator_event(struct snd_soc_dapm_widget *w,
+ struct snd_kcontrol *kcontrol, int event)
+{
+ if (SND_SOC_DAPM_EVENT_ON(event))
+ return regulator_enable(w->priv);
+ else
+ return regulator_disable_deferred(w->priv, w->shift);
+}
+EXPORT_SYMBOL_GPL(dapm_regulator_event);
+
static int dapm_widget_power_check(struct snd_soc_dapm_widget *w)
{
if (w->power_checked)
@@ -1308,6 +1335,7 @@
}
switch (w->id) {
case snd_soc_dapm_supply:
+ case snd_soc_dapm_regulator_supply:
/* Supplies can't affect their outputs, only their inputs */
break;
default:
@@ -1411,6 +1439,7 @@
*/
switch (w->id) {
case snd_soc_dapm_supply:
+ case snd_soc_dapm_regulator_supply:
case snd_soc_dapm_micbias:
if (d->target_bias_level < SND_SOC_BIAS_STANDBY)
d->target_bias_level = SND_SOC_BIAS_STANDBY;
@@ -1769,6 +1798,7 @@
case snd_soc_dapm_mixer:
case snd_soc_dapm_mixer_named_ctl:
case snd_soc_dapm_supply:
+ case snd_soc_dapm_regulator_supply:
if (w->name)
count += sprintf(buf + count, "%s: %s\n",
w->name, w->power ? "On":"Off");
@@ -2007,6 +2037,7 @@
case snd_soc_dapm_pre:
case snd_soc_dapm_post:
case snd_soc_dapm_supply:
+ case snd_soc_dapm_regulator_supply:
case snd_soc_dapm_aif_in:
case snd_soc_dapm_aif_out:
list_add(&path->list, &dapm->card->paths);
@@ -2673,10 +2704,25 @@
{
struct snd_soc_dapm_widget *w;
size_t name_len;
+ int ret;
if ((w = dapm_cnew_widget(widget)) == NULL)
return -ENOMEM;
+ switch (w->id) {
+ case snd_soc_dapm_regulator_supply:
+ w->priv = devm_regulator_get(dapm->dev, w->name);
+ if (IS_ERR(w->priv)) {
+ ret = PTR_ERR(w->priv);
+ dev_err(dapm->dev, "Failed to request %s: %d\n",
+ w->name, ret);
+ return ret;
+ }
+ break;
+ default:
+ break;
+ }
+
name_len = strlen(widget->name) + 1;
if (dapm->codec && dapm->codec->name_prefix)
name_len += 1 + strlen(dapm->codec->name_prefix);
@@ -2722,6 +2768,7 @@
w->power_check = dapm_generic_check_power;
break;
case snd_soc_dapm_supply:
+ case snd_soc_dapm_regulator_supply:
w->power_check = dapm_supply_check_power;
break;
default: