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>
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@ -13,6 +13,7 @@
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/gpio.h>
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#include <linux/gpio/consumer.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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@ -30,6 +31,34 @@ struct graph_card_data {
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struct asoc_simple_dai codec_dai;
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} *dai_props;
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struct snd_soc_dai_link *dai_link;
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struct gpio_desc *pa_gpio;
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};
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static int asoc_graph_card_outdrv_event(struct snd_soc_dapm_widget *w,
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struct snd_kcontrol *kcontrol,
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int event)
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{
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struct snd_soc_dapm_context *dapm = w->dapm;
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struct graph_card_data *priv = snd_soc_card_get_drvdata(dapm->card);
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switch (event) {
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case SND_SOC_DAPM_POST_PMU:
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gpiod_set_value_cansleep(priv->pa_gpio, 1);
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break;
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case SND_SOC_DAPM_PRE_PMD:
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gpiod_set_value_cansleep(priv->pa_gpio, 0);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static const struct snd_soc_dapm_widget asoc_graph_card_dapm_widgets[] = {
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SND_SOC_DAPM_OUT_DRV_E("Amplifier", SND_SOC_NOPM,
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0, 0, NULL, 0, asoc_graph_card_outdrv_event,
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SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
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};
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#define graph_priv_to_card(priv) (&(priv)->snd_card)
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@ -180,8 +209,16 @@ static int asoc_graph_card_parse_of(struct graph_card_data *priv)
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int rc, idx = 0;
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int ret;
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ret = asoc_simple_card_of_parse_widgets(card, NULL);
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if (ret < 0)
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return ret;
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ret = asoc_simple_card_of_parse_routing(card, NULL, 1);
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if (ret < 0)
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return ret;
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/*
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* we need to consider "widgets", "routing", "mclk-fs" around here
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* we need to consider "mclk-fs" around here
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* see simple-card
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*/
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@ -233,6 +270,13 @@ static int asoc_graph_card_probe(struct platform_device *pdev)
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if (!dai_props || !dai_link)
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return -ENOMEM;
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priv->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW);
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if (IS_ERR(priv->pa_gpio)) {
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ret = PTR_ERR(priv->pa_gpio);
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dev_err(dev, "failed to get amplifier gpio: %d\n", ret);
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return ret;
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}
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priv->dai_props = dai_props;
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priv->dai_link = dai_link;
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@ -242,6 +286,8 @@ static int asoc_graph_card_probe(struct platform_device *pdev)
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card->dev = dev;
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card->dai_link = dai_link;
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card->num_links = num;
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card->dapm_widgets = asoc_graph_card_dapm_widgets;
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card->num_dapm_widgets = ARRAY_SIZE(asoc_graph_card_dapm_widgets);
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ret = asoc_graph_card_parse_of(priv);
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if (ret < 0) {
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