1// SPDX-License-Identifier: GPL-2.0
2/*
3 * MAX9759 Amplifier Driver
4 *
5 * Copyright (c) 2017 BayLibre, SAS.
6 * Author: Neil Armstrong <narmstrong@baylibre.com>
7 */
8
9#include <linux/gpio/consumer.h>
10#include <linux/module.h>
11#include <sound/soc.h>
12#include <sound/soc-dapm.h>
13#include <sound/tlv.h>
14
15#define DRV_NAME "max9759"
16
17struct max9759 {
18	struct gpio_desc *gpiod_shutdown;
19	struct gpio_desc *gpiod_mute;
20	struct gpio_descs *gpiod_gain;
21	bool is_mute;
22	unsigned int gain;
23};
24
25static int pga_event(struct snd_soc_dapm_widget *w,
26		     struct snd_kcontrol *control, int event)
27{
28	struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
29	struct max9759 *priv = snd_soc_component_get_drvdata(c);
30
31	if (SND_SOC_DAPM_EVENT_ON(event))
32		gpiod_set_value_cansleep(priv->gpiod_shutdown, 0);
33	else
34		gpiod_set_value_cansleep(priv->gpiod_shutdown, 1);
35
36	return 0;
37}
38
39/* From 6dB to 24dB in steps of 6dB */
40static const DECLARE_TLV_DB_SCALE(speaker_gain_tlv, 600, 600, 0);
41
42static int speaker_gain_control_get(struct snd_kcontrol *kcontrol,
43				    struct snd_ctl_elem_value *ucontrol)
44{
45	struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
46	struct max9759 *priv = snd_soc_component_get_drvdata(c);
47
48	ucontrol->value.integer.value[0] = priv->gain;
49
50	return 0;
51}
52
53static const bool speaker_gain_table[4][2] = {
54	/* G1, G2 */
55	{true, true},	/* +6dB */
56	{false, true},	/* +12dB */
57	{true, false},	/* +18dB */
58	{false, false},	/* +24dB */
59};
60
61static int speaker_gain_control_put(struct snd_kcontrol *kcontrol,
62				    struct snd_ctl_elem_value *ucontrol)
63{
64	struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
65	struct max9759 *priv = snd_soc_component_get_drvdata(c);
66
67	if (ucontrol->value.integer.value[0] < 0 ||
68	    ucontrol->value.integer.value[0] > 3)
69		return -EINVAL;
70
71	priv->gain = ucontrol->value.integer.value[0];
72
73	/* G1 */
74	gpiod_set_value_cansleep(priv->gpiod_gain->desc[0],
75				 speaker_gain_table[priv->gain][0]);
76	/* G2 */
77	gpiod_set_value_cansleep(priv->gpiod_gain->desc[1],
78				 speaker_gain_table[priv->gain][1]);
79
80	return 1;
81}
82
83static int speaker_mute_get(struct snd_kcontrol *kcontrol,
84			    struct snd_ctl_elem_value *ucontrol)
85{
86	struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
87	struct max9759 *priv = snd_soc_component_get_drvdata(c);
88
89	ucontrol->value.integer.value[0] = !priv->is_mute;
90
91	return 0;
92}
93
94static int speaker_mute_put(struct snd_kcontrol *kcontrol,
95			    struct snd_ctl_elem_value *ucontrol)
96{
97	struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
98	struct max9759 *priv = snd_soc_component_get_drvdata(c);
99
100	priv->is_mute = !ucontrol->value.integer.value[0];
101
102	gpiod_set_value_cansleep(priv->gpiod_mute, priv->is_mute);
103
104	return 1;
105}
106
107static const struct snd_kcontrol_new max9759_dapm_controls[] = {
108	SOC_SINGLE_EXT_TLV("Speaker Gain Volume", 0, 0, 3, 0,
109			   speaker_gain_control_get, speaker_gain_control_put,
110			   speaker_gain_tlv),
111	SOC_SINGLE_BOOL_EXT("Playback Switch", 0,
112			    speaker_mute_get, speaker_mute_put),
113};
114
115static const struct snd_soc_dapm_widget max9759_dapm_widgets[] = {
116	SND_SOC_DAPM_INPUT("INL"),
117	SND_SOC_DAPM_INPUT("INR"),
118	SND_SOC_DAPM_PGA_E("PGA", SND_SOC_NOPM, 0, 0, NULL, 0, pga_event,
119			   (SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD)),
120	SND_SOC_DAPM_OUTPUT("OUTL"),
121	SND_SOC_DAPM_OUTPUT("OUTR"),
122};
123
124static const struct snd_soc_dapm_route max9759_dapm_routes[] = {
125	{ "PGA", NULL, "INL" },
126	{ "PGA", NULL, "INR" },
127	{ "OUTL", NULL, "PGA" },
128	{ "OUTR", NULL, "PGA" },
129};
130
131static const struct snd_soc_component_driver max9759_component_driver = {
132	.controls		= max9759_dapm_controls,
133	.num_controls		= ARRAY_SIZE(max9759_dapm_controls),
134	.dapm_widgets		= max9759_dapm_widgets,
135	.num_dapm_widgets	= ARRAY_SIZE(max9759_dapm_widgets),
136	.dapm_routes		= max9759_dapm_routes,
137	.num_dapm_routes	= ARRAY_SIZE(max9759_dapm_routes),
138};
139
140static int max9759_probe(struct platform_device *pdev)
141{
142	struct device *dev = &pdev->dev;
143	struct max9759 *priv;
144	int err;
145
146	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
147	if (!priv)
148		return -ENOMEM;
149
150	platform_set_drvdata(pdev, priv);
151
152	priv->gpiod_shutdown = devm_gpiod_get(dev, "shutdown", GPIOD_OUT_HIGH);
153	if (IS_ERR(priv->gpiod_shutdown)) {
154		err = PTR_ERR(priv->gpiod_shutdown);
155		if (err != -EPROBE_DEFER)
156			dev_err(dev, "Failed to get 'shutdown' gpio: %d", err);
157		return err;
158	}
159
160	priv->gpiod_mute = devm_gpiod_get(dev, "mute", GPIOD_OUT_HIGH);
161	if (IS_ERR(priv->gpiod_mute)) {
162		err = PTR_ERR(priv->gpiod_mute);
163		if (err != -EPROBE_DEFER)
164			dev_err(dev, "Failed to get 'mute' gpio: %d", err);
165		return err;
166	}
167	priv->is_mute = true;
168
169	priv->gpiod_gain = devm_gpiod_get_array(dev, "gain", GPIOD_OUT_HIGH);
170	if (IS_ERR(priv->gpiod_gain)) {
171		err = PTR_ERR(priv->gpiod_gain);
172		if (err != -EPROBE_DEFER)
173			dev_err(dev, "Failed to get 'gain' gpios: %d", err);
174		return err;
175	}
176	priv->gain = 0;
177
178	if (priv->gpiod_gain->ndescs != 2) {
179		dev_err(dev, "Invalid 'gain' gpios count: %d",
180			priv->gpiod_gain->ndescs);
181		return -EINVAL;
182	}
183
184	return devm_snd_soc_register_component(dev, &max9759_component_driver,
185					       NULL, 0);
186}
187
188#ifdef CONFIG_OF
189static const struct of_device_id max9759_ids[] = {
190	{ .compatible = "maxim,max9759", },
191	{ }
192};
193MODULE_DEVICE_TABLE(of, max9759_ids);
194#endif
195
196static struct platform_driver max9759_driver = {
197	.driver = {
198		.name = DRV_NAME,
199		.of_match_table = of_match_ptr(max9759_ids),
200	},
201	.probe = max9759_probe,
202};
203
204module_platform_driver(max9759_driver);
205
206MODULE_DESCRIPTION("ASoC MAX9759 amplifier driver");
207MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
208MODULE_LICENSE("GPL");
209