xref: /openbmc/linux/sound/soc/codecs/max9759.c (revision 0d727e18)
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 
17 struct 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 
25 static 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 */
40 static const DECLARE_TLV_DB_SCALE(speaker_gain_tlv, 600, 600, 0);
41 
42 static 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 
53 static 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 
61 static 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 
83 static 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 
94 static 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 
107 static 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 
115 static 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 
124 static 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 
131 static 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 
140 static int max9759_probe(struct platform_device *pdev)
141 {
142 	struct device *dev = &pdev->dev;
143 	struct max9759 *priv;
144 
145 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
146 	if (!priv)
147 		return -ENOMEM;
148 
149 	platform_set_drvdata(pdev, priv);
150 
151 	priv->gpiod_shutdown = devm_gpiod_get(dev, "shutdown", GPIOD_OUT_HIGH);
152 	if (IS_ERR(priv->gpiod_shutdown))
153 		return dev_err_probe(dev, PTR_ERR(priv->gpiod_shutdown),
154 				     "Failed to get 'shutdown' gpio");
155 
156 	priv->gpiod_mute = devm_gpiod_get(dev, "mute", GPIOD_OUT_HIGH);
157 	if (IS_ERR(priv->gpiod_mute))
158 		return dev_err_probe(dev, PTR_ERR(priv->gpiod_mute),
159 				     "Failed to get 'mute' gpio");
160 	priv->is_mute = true;
161 
162 	priv->gpiod_gain = devm_gpiod_get_array(dev, "gain", GPIOD_OUT_HIGH);
163 	if (IS_ERR(priv->gpiod_gain))
164 		return dev_err_probe(dev, PTR_ERR(priv->gpiod_gain),
165 				     "Failed to get 'gain' gpios");
166 	priv->gain = 0;
167 
168 	if (priv->gpiod_gain->ndescs != 2) {
169 		dev_err(dev, "Invalid 'gain' gpios count: %d",
170 			priv->gpiod_gain->ndescs);
171 		return -EINVAL;
172 	}
173 
174 	return devm_snd_soc_register_component(dev, &max9759_component_driver,
175 					       NULL, 0);
176 }
177 
178 #ifdef CONFIG_OF
179 static const struct of_device_id max9759_ids[] = {
180 	{ .compatible = "maxim,max9759", },
181 	{ }
182 };
183 MODULE_DEVICE_TABLE(of, max9759_ids);
184 #endif
185 
186 static struct platform_driver max9759_driver = {
187 	.driver = {
188 		.name = DRV_NAME,
189 		.of_match_table = of_match_ptr(max9759_ids),
190 	},
191 	.probe = max9759_probe,
192 };
193 
194 module_platform_driver(max9759_driver);
195 
196 MODULE_DESCRIPTION("ASoC MAX9759 amplifier driver");
197 MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
198 MODULE_LICENSE("GPL");
199