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ASoC: audio-graph-card: add widgets and routing for external amplifier support 

It's very common that audio card has a machine level amplifier which is
controlled by GPIO.  The patch adds DAPM widgets and routing support
into audio-graph-card driver, and creates an output driver widget with
event to control the amplifier via GPIO.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Shawn Guo 2017-06-29 21:26:38 +08:00 committed by Mark Brown
parent a0c683d734
commit f986907c92
1 changed files with 47 additions and 1 deletions
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48
sound/soc/generic/audio-graph-card.c
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@ -13,6 +13,7 @@
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
@ -30,6 +31,34 @@ struct graph_card_data {
struct asoc_simple_dai codec_dai;
} *dai_props;
struct snd_soc_dai_link *dai_link;
struct gpio_desc *pa_gpio;
};
static int asoc_graph_card_outdrv_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kcontrol,
int event)
{
struct snd_soc_dapm_context *dapm = w->dapm;
struct graph_card_data *priv = snd_soc_card_get_drvdata(dapm->card);
switch (event) {
case SND_SOC_DAPM_POST_PMU:
gpiod_set_value_cansleep(priv->pa_gpio, 1);
break;
case SND_SOC_DAPM_PRE_PMD:
gpiod_set_value_cansleep(priv->pa_gpio, 0);
break;
default:
return -EINVAL;
}
return 0;
}
static const struct snd_soc_dapm_widget asoc_graph_card_dapm_widgets[] = {
SND_SOC_DAPM_OUT_DRV_E("Amplifier", SND_SOC_NOPM,
0, 0, NULL, 0, asoc_graph_card_outdrv_event,
SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
};
#define graph_priv_to_card(priv) (&(priv)->snd_card)
@ -180,8 +209,16 @@ static int asoc_graph_card_parse_of(struct graph_card_data *priv)
int rc, idx = 0;
int ret;
ret = asoc_simple_card_of_parse_widgets(card, NULL);
if (ret < 0)
return ret;
ret = asoc_simple_card_of_parse_routing(card, NULL, 1);
if (ret < 0)
return ret;
/*
* we need to consider "widgets", "routing", "mclk-fs" around here
* we need to consider "mclk-fs" around here
* see simple-card
*/
@ -233,6 +270,13 @@ static int asoc_graph_card_probe(struct platform_device *pdev)
if (!dai_props || !dai_link)
return -ENOMEM;
priv->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW);
if (IS_ERR(priv->pa_gpio)) {
ret = PTR_ERR(priv->pa_gpio);
dev_err(dev, "failed to get amplifier gpio: %d\n", ret);
return ret;
}
priv->dai_props = dai_props;
priv->dai_link = dai_link;
@ -242,6 +286,8 @@ static int asoc_graph_card_probe(struct platform_device *pdev)
card->dev = dev;
card->dai_link = dai_link;
card->num_links = num;
card->dapm_widgets = asoc_graph_card_dapm_widgets;
card->num_dapm_widgets = ARRAY_SIZE(asoc_graph_card_dapm_widgets);
ret = asoc_graph_card_parse_of(priv);
if (ret < 0) {