2019-05-31 21:22:42 -06:00
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// SPDX-License-Identifier: GPL-2.0
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2018-02-19 06:45:58 -07:00
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/*
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* MAX9759 Amplifier Driver
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*
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* Copyright (c) 2017 BayLibre, SAS.
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* Author: Neil Armstrong <narmstrong@baylibre.com>
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*/
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#include <linux/gpio/consumer.h>
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#include <linux/module.h>
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#include <sound/soc.h>
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#include <sound/soc-dapm.h>
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#include <sound/tlv.h>
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#define DRV_NAME "max9759"
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struct max9759 {
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struct gpio_desc *gpiod_shutdown;
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struct gpio_desc *gpiod_mute;
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struct gpio_descs *gpiod_gain;
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bool is_mute;
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unsigned int gain;
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};
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static int pga_event(struct snd_soc_dapm_widget *w,
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struct snd_kcontrol *control, int event)
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{
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struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
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struct max9759 *priv = snd_soc_component_get_drvdata(c);
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if (SND_SOC_DAPM_EVENT_ON(event))
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gpiod_set_value_cansleep(priv->gpiod_shutdown, 0);
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else
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gpiod_set_value_cansleep(priv->gpiod_shutdown, 1);
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return 0;
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}
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/* From 6dB to 24dB in steps of 6dB */
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static const DECLARE_TLV_DB_SCALE(speaker_gain_tlv, 600, 600, 0);
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static int speaker_gain_control_get(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
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struct max9759 *priv = snd_soc_component_get_drvdata(c);
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ucontrol->value.integer.value[0] = priv->gain;
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return 0;
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}
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static const bool speaker_gain_table[4][2] = {
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/* G1, G2 */
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{true, true}, /* +6dB */
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{false, true}, /* +12dB */
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{true, false}, /* +18dB */
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{false, false}, /* +24dB */
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};
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static int speaker_gain_control_put(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
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struct max9759 *priv = snd_soc_component_get_drvdata(c);
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if (ucontrol->value.integer.value[0] > 3)
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return -EINVAL;
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priv->gain = ucontrol->value.integer.value[0];
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/* G1 */
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gpiod_set_value_cansleep(priv->gpiod_gain->desc[0],
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speaker_gain_table[priv->gain][0]);
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/* G2 */
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gpiod_set_value_cansleep(priv->gpiod_gain->desc[1],
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speaker_gain_table[priv->gain][1]);
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return 1;
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}
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static int speaker_mute_get(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
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struct max9759 *priv = snd_soc_component_get_drvdata(c);
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ucontrol->value.integer.value[0] = !priv->is_mute;
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return 0;
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}
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static int speaker_mute_put(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
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struct max9759 *priv = snd_soc_component_get_drvdata(c);
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priv->is_mute = !ucontrol->value.integer.value[0];
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gpiod_set_value_cansleep(priv->gpiod_mute, priv->is_mute);
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return 1;
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}
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static const struct snd_kcontrol_new max9759_dapm_controls[] = {
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SOC_SINGLE_EXT_TLV("Speaker Gain Volume", 0, 0, 3, 0,
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speaker_gain_control_get, speaker_gain_control_put,
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speaker_gain_tlv),
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SOC_SINGLE_BOOL_EXT("Playback Switch", 0,
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speaker_mute_get, speaker_mute_put),
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};
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static const struct snd_soc_dapm_widget max9759_dapm_widgets[] = {
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SND_SOC_DAPM_INPUT("INL"),
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SND_SOC_DAPM_INPUT("INR"),
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SND_SOC_DAPM_PGA_E("PGA", SND_SOC_NOPM, 0, 0, NULL, 0, pga_event,
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(SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD)),
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SND_SOC_DAPM_OUTPUT("OUTL"),
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SND_SOC_DAPM_OUTPUT("OUTR"),
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};
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static const struct snd_soc_dapm_route max9759_dapm_routes[] = {
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{ "PGA", NULL, "INL" },
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{ "PGA", NULL, "INR" },
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{ "OUTL", NULL, "PGA" },
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{ "OUTR", NULL, "PGA" },
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};
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static const struct snd_soc_component_driver max9759_component_driver = {
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.controls = max9759_dapm_controls,
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.num_controls = ARRAY_SIZE(max9759_dapm_controls),
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.dapm_widgets = max9759_dapm_widgets,
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.num_dapm_widgets = ARRAY_SIZE(max9759_dapm_widgets),
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.dapm_routes = max9759_dapm_routes,
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.num_dapm_routes = ARRAY_SIZE(max9759_dapm_routes),
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};
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static int max9759_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct max9759 *priv;
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int err;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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platform_set_drvdata(pdev, priv);
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priv->gpiod_shutdown = devm_gpiod_get(dev, "shutdown", GPIOD_OUT_HIGH);
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if (IS_ERR(priv->gpiod_shutdown)) {
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err = PTR_ERR(priv->gpiod_shutdown);
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if (err != -EPROBE_DEFER)
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dev_err(dev, "Failed to get 'shutdown' gpio: %d", err);
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return err;
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}
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priv->gpiod_mute = devm_gpiod_get(dev, "mute", GPIOD_OUT_HIGH);
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if (IS_ERR(priv->gpiod_mute)) {
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err = PTR_ERR(priv->gpiod_mute);
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if (err != -EPROBE_DEFER)
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dev_err(dev, "Failed to get 'mute' gpio: %d", err);
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return err;
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}
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priv->is_mute = true;
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priv->gpiod_gain = devm_gpiod_get_array(dev, "gain", GPIOD_OUT_HIGH);
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if (IS_ERR(priv->gpiod_gain)) {
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err = PTR_ERR(priv->gpiod_gain);
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if (err != -EPROBE_DEFER)
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dev_err(dev, "Failed to get 'gain' gpios: %d", err);
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return err;
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}
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priv->gain = 0;
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if (priv->gpiod_gain->ndescs != 2) {
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dev_err(dev, "Invalid 'gain' gpios count: %d",
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priv->gpiod_gain->ndescs);
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return -EINVAL;
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}
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return devm_snd_soc_register_component(dev, &max9759_component_driver,
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NULL, 0);
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}
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#ifdef CONFIG_OF
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static const struct of_device_id max9759_ids[] = {
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{ .compatible = "maxim,max9759", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, max9759_ids);
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#endif
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static struct platform_driver max9759_driver = {
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.driver = {
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.name = DRV_NAME,
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.of_match_table = of_match_ptr(max9759_ids),
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},
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.probe = max9759_probe,
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};
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module_platform_driver(max9759_driver);
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MODULE_DESCRIPTION("ASoC MAX9759 amplifier driver");
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MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
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MODULE_LICENSE("GPL");
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