diff options
Diffstat (limited to 'sound/soc/codecs/max9759.c')
| -rw-r--r-- | sound/soc/codecs/max9759.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/sound/soc/codecs/max9759.c b/sound/soc/codecs/max9759.c new file mode 100644 index 000000000..bc57d7687 --- /dev/null +++ b/sound/soc/codecs/max9759.c @@ -0,0 +1,198 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * MAX9759 Amplifier Driver + * + * Copyright (c) 2017 BayLibre, SAS. + * Author: Neil Armstrong <narmstrong@baylibre.com> + */ + +#include <linux/gpio/consumer.h> +#include <linux/module.h> +#include <sound/soc.h> +#include <sound/soc-dapm.h> +#include <sound/tlv.h> + +#define DRV_NAME "max9759" + +struct max9759 { + struct gpio_desc *gpiod_shutdown; + struct gpio_desc *gpiod_mute; + struct gpio_descs *gpiod_gain; + bool is_mute; + unsigned int gain; +}; + +static int pga_event(struct snd_soc_dapm_widget *w, + struct snd_kcontrol *control, int event) +{ + struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm); + struct max9759 *priv = snd_soc_component_get_drvdata(c); + + if (SND_SOC_DAPM_EVENT_ON(event)) + gpiod_set_value_cansleep(priv->gpiod_shutdown, 0); + else + gpiod_set_value_cansleep(priv->gpiod_shutdown, 1); + + return 0; +} + +/* From 6dB to 24dB in steps of 6dB */ +static const DECLARE_TLV_DB_SCALE(speaker_gain_tlv, 600, 600, 0); + +static int speaker_gain_control_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol); + struct max9759 *priv = snd_soc_component_get_drvdata(c); + + ucontrol->value.integer.value[0] = priv->gain; + + return 0; +} + +static const bool speaker_gain_table[4][2] = { + /* G1, G2 */ + {true, true}, /* +6dB */ + {false, true}, /* +12dB */ + {true, false}, /* +18dB */ + {false, false}, /* +24dB */ +}; + +static int speaker_gain_control_put(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol); + struct max9759 *priv = snd_soc_component_get_drvdata(c); + + if (ucontrol->value.integer.value[0] < 0 || + ucontrol->value.integer.value[0] > 3) + return -EINVAL; + + priv->gain = ucontrol->value.integer.value[0]; + + /* G1 */ + gpiod_set_value_cansleep(priv->gpiod_gain->desc[0], + speaker_gain_table[priv->gain][0]); + /* G2 */ + gpiod_set_value_cansleep(priv->gpiod_gain->desc[1], + speaker_gain_table[priv->gain][1]); + + return 1; +} + +static int speaker_mute_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol); + struct max9759 *priv = snd_soc_component_get_drvdata(c); + + ucontrol->value.integer.value[0] = !priv->is_mute; + + return 0; +} + +static int speaker_mute_put(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol); + struct max9759 *priv = snd_soc_component_get_drvdata(c); + + priv->is_mute = !ucontrol->value.integer.value[0]; + + gpiod_set_value_cansleep(priv->gpiod_mute, priv->is_mute); + + return 1; +} + +static const struct snd_kcontrol_new max9759_dapm_controls[] = { + SOC_SINGLE_EXT_TLV("Speaker Gain Volume", 0, 0, 3, 0, + speaker_gain_control_get, speaker_gain_control_put, + speaker_gain_tlv), + SOC_SINGLE_BOOL_EXT("Playback Switch", 0, + speaker_mute_get, speaker_mute_put), +}; + +static const struct snd_soc_dapm_widget max9759_dapm_widgets[] = { + SND_SOC_DAPM_INPUT("INL"), + SND_SOC_DAPM_INPUT("INR"), + SND_SOC_DAPM_PGA_E("PGA", SND_SOC_NOPM, 0, 0, NULL, 0, pga_event, + (SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD)), + SND_SOC_DAPM_OUTPUT("OUTL"), + SND_SOC_DAPM_OUTPUT("OUTR"), +}; + +static const struct snd_soc_dapm_route max9759_dapm_routes[] = { + { "PGA", NULL, "INL" }, + { "PGA", NULL, "INR" }, + { "OUTL", NULL, "PGA" }, + { "OUTR", NULL, "PGA" }, +}; + +static const struct snd_soc_component_driver max9759_component_driver = { + .controls = max9759_dapm_controls, + .num_controls = ARRAY_SIZE(max9759_dapm_controls), + .dapm_widgets = max9759_dapm_widgets, + .num_dapm_widgets = ARRAY_SIZE(max9759_dapm_widgets), + .dapm_routes = max9759_dapm_routes, + .num_dapm_routes = ARRAY_SIZE(max9759_dapm_routes), +}; + +static int max9759_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct max9759 *priv; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + platform_set_drvdata(pdev, priv); + + priv->gpiod_shutdown = devm_gpiod_get(dev, "shutdown", GPIOD_OUT_HIGH); + if (IS_ERR(priv->gpiod_shutdown)) + return dev_err_probe(dev, PTR_ERR(priv->gpiod_shutdown), + "Failed to get 'shutdown' gpio"); + + priv->gpiod_mute = devm_gpiod_get(dev, "mute", GPIOD_OUT_HIGH); + if (IS_ERR(priv->gpiod_mute)) + return dev_err_probe(dev, PTR_ERR(priv->gpiod_mute), + "Failed to get 'mute' gpio"); + priv->is_mute = true; + + priv->gpiod_gain = devm_gpiod_get_array(dev, "gain", GPIOD_OUT_HIGH); + if (IS_ERR(priv->gpiod_gain)) + return dev_err_probe(dev, PTR_ERR(priv->gpiod_gain), + "Failed to get 'gain' gpios"); + priv->gain = 0; + + if (priv->gpiod_gain->ndescs != 2) { + dev_err(dev, "Invalid 'gain' gpios count: %d", + priv->gpiod_gain->ndescs); + return -EINVAL; + } + + return devm_snd_soc_register_component(dev, &max9759_component_driver, + NULL, 0); +} + +#ifdef CONFIG_OF +static const struct of_device_id max9759_ids[] = { + { .compatible = "maxim,max9759", }, + { } +}; +MODULE_DEVICE_TABLE(of, max9759_ids); +#endif + +static struct platform_driver max9759_driver = { + .driver = { + .name = DRV_NAME, + .of_match_table = of_match_ptr(max9759_ids), + }, + .probe = max9759_probe, +}; + +module_platform_driver(max9759_driver); + +MODULE_DESCRIPTION("ASoC MAX9759 amplifier driver"); +MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>"); +MODULE_LICENSE("GPL"); |