diff options
Diffstat (limited to 'sound/soc/codecs/simple-mux.c')
| -rw-r--r-- | sound/soc/codecs/simple-mux.c | 92 |
1 files changed, 77 insertions, 15 deletions
diff --git a/sound/soc/codecs/simple-mux.c b/sound/soc/codecs/simple-mux.c index bf67de12d20b..390696440155 100644 --- a/sound/soc/codecs/simple-mux.c +++ b/sound/soc/codecs/simple-mux.c @@ -6,15 +6,26 @@ #include <linux/gpio/consumer.h> #include <linux/module.h> +#include <linux/mux/driver.h> #include <linux/regulator/consumer.h> #include <sound/soc.h> +#define MUX_TEXT_SIZE 2 +#define MUX_WIDGET_SIZE 4 +#define MUX_ROUTE_SIZE 3 struct simple_mux { struct gpio_desc *gpiod_mux; unsigned int mux; + const char *mux_texts[MUX_TEXT_SIZE]; + unsigned int idle_state; + struct soc_enum mux_enum; + struct snd_kcontrol_new mux_mux; + struct snd_soc_dapm_widget mux_widgets[MUX_WIDGET_SIZE]; + struct snd_soc_dapm_route mux_routes[MUX_ROUTE_SIZE]; + struct snd_soc_component_driver mux_driver; }; -static const char * const simple_mux_texts[] = { +static const char * const simple_mux_texts[MUX_TEXT_SIZE] = { "Input 1", "Input 2" }; @@ -48,6 +59,9 @@ static int simple_mux_control_put(struct snd_kcontrol *kcontrol, priv->mux = ucontrol->value.enumerated.item[0]; + if (priv->idle_state != MUX_IDLE_AS_IS && dapm->bias_level < SND_SOC_BIAS_PREPARE) + return 0; + gpiod_set_value_cansleep(priv->gpiod_mux, priv->mux); return snd_soc_dapm_mux_update_power(dapm, kcontrol, @@ -66,31 +80,48 @@ static unsigned int simple_mux_read(struct snd_soc_component *component, static const struct snd_kcontrol_new simple_mux_mux = SOC_DAPM_ENUM_EXT("Muxer", simple_mux_enum, simple_mux_control_get, simple_mux_control_put); -static const struct snd_soc_dapm_widget simple_mux_dapm_widgets[] = { +static int simple_mux_event(struct snd_soc_dapm_widget *w, + struct snd_kcontrol *kcontrol, int event) +{ + struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm); + struct simple_mux *priv = snd_soc_component_get_drvdata(c); + + if (priv->idle_state != MUX_IDLE_AS_IS) { + switch (event) { + case SND_SOC_DAPM_PRE_PMU: + gpiod_set_value_cansleep(priv->gpiod_mux, priv->mux); + break; + case SND_SOC_DAPM_POST_PMD: + gpiod_set_value_cansleep(priv->gpiod_mux, priv->idle_state); + break; + default: + break; + } + } + + return 0; +} + +static const struct snd_soc_dapm_widget simple_mux_dapm_widgets[MUX_WIDGET_SIZE] = { SND_SOC_DAPM_INPUT("IN1"), SND_SOC_DAPM_INPUT("IN2"), - SND_SOC_DAPM_MUX("MUX", SND_SOC_NOPM, 0, 0, &simple_mux_mux), + SND_SOC_DAPM_MUX_E("MUX", SND_SOC_NOPM, 0, 0, &simple_mux_mux, // see simple_mux_probe() + simple_mux_event, SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD), SND_SOC_DAPM_OUTPUT("OUT"), }; -static const struct snd_soc_dapm_route simple_mux_dapm_routes[] = { +static const struct snd_soc_dapm_route simple_mux_dapm_routes[MUX_ROUTE_SIZE] = { { "OUT", NULL, "MUX" }, - { "MUX", "Input 1", "IN1" }, - { "MUX", "Input 2", "IN2" }, -}; - -static const struct snd_soc_component_driver simple_mux_component_driver = { - .dapm_widgets = simple_mux_dapm_widgets, - .num_dapm_widgets = ARRAY_SIZE(simple_mux_dapm_widgets), - .dapm_routes = simple_mux_dapm_routes, - .num_dapm_routes = ARRAY_SIZE(simple_mux_dapm_routes), - .read = simple_mux_read, + { "MUX", "Input 1", "IN1" }, // see simple_mux_probe() + { "MUX", "Input 2", "IN2" }, // see simple_mux_probe() }; static int simple_mux_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; struct simple_mux *priv; + int ret; priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) @@ -103,7 +134,38 @@ static int simple_mux_probe(struct platform_device *pdev) return dev_err_probe(dev, PTR_ERR(priv->gpiod_mux), "Failed to get 'mux' gpio"); - return devm_snd_soc_register_component(dev, &simple_mux_component_driver, NULL, 0); + /* Copy default settings */ + memcpy(&priv->mux_texts, &simple_mux_texts, sizeof(priv->mux_texts)); + memcpy(&priv->mux_enum, &simple_mux_enum, sizeof(priv->mux_enum)); + memcpy(&priv->mux_mux, &simple_mux_mux, sizeof(priv->mux_mux)); + memcpy(&priv->mux_widgets, &simple_mux_dapm_widgets, sizeof(priv->mux_widgets)); + memcpy(&priv->mux_routes, &simple_mux_dapm_routes, sizeof(priv->mux_routes)); + + priv->mux_driver.dapm_widgets = priv->mux_widgets; + priv->mux_driver.num_dapm_widgets = MUX_WIDGET_SIZE; + priv->mux_driver.dapm_routes = priv->mux_routes; + priv->mux_driver.num_dapm_routes = MUX_ROUTE_SIZE; + priv->mux_driver.read = simple_mux_read; + + /* Overwrite text ("Input 1", "Input 2") if property exists */ + of_property_read_string_array(np, "state-labels", priv->mux_texts, MUX_TEXT_SIZE); + + ret = of_property_read_u32(np, "idle-state", &priv->idle_state); + if (ret < 0) { + priv->idle_state = MUX_IDLE_AS_IS; + } else if (priv->idle_state != MUX_IDLE_AS_IS && priv->idle_state >= 2) { + dev_err(dev, "invalid idle-state %u\n", priv->idle_state); + return -EINVAL; + } + + /* switch to use priv data instead of default */ + priv->mux_enum.texts = priv->mux_texts; + priv->mux_mux.private_value = (unsigned long)&priv->mux_enum; + priv->mux_widgets[2].kcontrol_news = &priv->mux_mux; + priv->mux_routes[1].control = priv->mux_texts[0]; // "Input 1" + priv->mux_routes[2].control = priv->mux_texts[1]; // "Input 2" + + return devm_snd_soc_register_component(dev, &priv->mux_driver, NULL, 0); } #ifdef CONFIG_OF |