--- /dev/null
+// SPDX-Licence-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] > 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;
+ int err;
+
+ 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)) {
+ err = PTR_ERR(priv->gpiod_shutdown);
+ if (err != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get 'shutdown' gpio: %d", err);
+ return err;
+ }
+
+ priv->gpiod_mute = devm_gpiod_get(dev, "mute", GPIOD_OUT_HIGH);
+ if (IS_ERR(priv->gpiod_mute)) {
+ err = PTR_ERR(priv->gpiod_mute);
+ if (err != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get 'mute' gpio: %d", err);
+ return err;
+ }
+ priv->is_mute = true;
+
+ priv->gpiod_gain = devm_gpiod_get_array(dev, "gain", GPIOD_OUT_HIGH);
+ if (IS_ERR(priv->gpiod_gain)) {
+ err = PTR_ERR(priv->gpiod_gain);
+ if (err != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get 'gain' gpios: %d", err);
+ return err;
+ }
+ 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");
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