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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
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
55 {true, true},
56 {false, true},
57 {true, false},
58 {false, false},
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] > 3)
68 return -EINVAL;
69
70 priv->gain = ucontrol->value.integer.value[0];
71
72
73 gpiod_set_value_cansleep(priv->gpiod_gain->desc[0],
74 speaker_gain_table[priv->gain][0]);
75
76 gpiod_set_value_cansleep(priv->gpiod_gain->desc[1],
77 speaker_gain_table[priv->gain][1]);
78
79 return 1;
80}
81
82static int speaker_mute_get(struct snd_kcontrol *kcontrol,
83 struct snd_ctl_elem_value *ucontrol)
84{
85 struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
86 struct max9759 *priv = snd_soc_component_get_drvdata(c);
87
88 ucontrol->value.integer.value[0] = !priv->is_mute;
89
90 return 0;
91}
92
93static int speaker_mute_put(struct snd_kcontrol *kcontrol,
94 struct snd_ctl_elem_value *ucontrol)
95{
96 struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
97 struct max9759 *priv = snd_soc_component_get_drvdata(c);
98
99 priv->is_mute = !ucontrol->value.integer.value[0];
100
101 gpiod_set_value_cansleep(priv->gpiod_mute, priv->is_mute);
102
103 return 1;
104}
105
106static const struct snd_kcontrol_new max9759_dapm_controls[] = {
107 SOC_SINGLE_EXT_TLV("Speaker Gain Volume", 0, 0, 3, 0,
108 speaker_gain_control_get, speaker_gain_control_put,
109 speaker_gain_tlv),
110 SOC_SINGLE_BOOL_EXT("Playback Switch", 0,
111 speaker_mute_get, speaker_mute_put),
112};
113
114static const struct snd_soc_dapm_widget max9759_dapm_widgets[] = {
115 SND_SOC_DAPM_INPUT("INL"),
116 SND_SOC_DAPM_INPUT("INR"),
117 SND_SOC_DAPM_PGA_E("PGA", SND_SOC_NOPM, 0, 0, NULL, 0, pga_event,
118 (SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD)),
119 SND_SOC_DAPM_OUTPUT("OUTL"),
120 SND_SOC_DAPM_OUTPUT("OUTR"),
121};
122
123static const struct snd_soc_dapm_route max9759_dapm_routes[] = {
124 { "PGA", NULL, "INL" },
125 { "PGA", NULL, "INR" },
126 { "OUTL", NULL, "PGA" },
127 { "OUTR", NULL, "PGA" },
128};
129
130static const struct snd_soc_component_driver max9759_component_driver = {
131 .controls = max9759_dapm_controls,
132 .num_controls = ARRAY_SIZE(max9759_dapm_controls),
133 .dapm_widgets = max9759_dapm_widgets,
134 .num_dapm_widgets = ARRAY_SIZE(max9759_dapm_widgets),
135 .dapm_routes = max9759_dapm_routes,
136 .num_dapm_routes = ARRAY_SIZE(max9759_dapm_routes),
137};
138
139static int max9759_probe(struct platform_device *pdev)
140{
141 struct device *dev = &pdev->dev;
142 struct max9759 *priv;
143 int err;
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 err = PTR_ERR(priv->gpiod_shutdown);
154 if (err != -EPROBE_DEFER)
155 dev_err(dev, "Failed to get 'shutdown' gpio: %d", err);
156 return err;
157 }
158
159 priv->gpiod_mute = devm_gpiod_get(dev, "mute", GPIOD_OUT_HIGH);
160 if (IS_ERR(priv->gpiod_mute)) {
161 err = PTR_ERR(priv->gpiod_mute);
162 if (err != -EPROBE_DEFER)
163 dev_err(dev, "Failed to get 'mute' gpio: %d", err);
164 return err;
165 }
166 priv->is_mute = true;
167
168 priv->gpiod_gain = devm_gpiod_get_array(dev, "gain", GPIOD_OUT_HIGH);
169 if (IS_ERR(priv->gpiod_gain)) {
170 err = PTR_ERR(priv->gpiod_gain);
171 if (err != -EPROBE_DEFER)
172 dev_err(dev, "Failed to get 'gain' gpios: %d", err);
173 return err;
174 }
175 priv->gain = 0;
176
177 if (priv->gpiod_gain->ndescs != 2) {
178 dev_err(dev, "Invalid 'gain' gpios count: %d",
179 priv->gpiod_gain->ndescs);
180 return -EINVAL;
181 }
182
183 return devm_snd_soc_register_component(dev, &max9759_component_driver,
184 NULL, 0);
185}
186
187#ifdef CONFIG_OF
188static const struct of_device_id max9759_ids[] = {
189 { .compatible = "maxim,max9759", },
190 { }
191};
192MODULE_DEVICE_TABLE(of, max9759_ids);
193#endif
194
195static struct platform_driver max9759_driver = {
196 .driver = {
197 .name = DRV_NAME,
198 .of_match_table = of_match_ptr(max9759_ids),
199 },
200 .probe = max9759_probe,
201};
202
203module_platform_driver(max9759_driver);
204
205MODULE_DESCRIPTION("ASoC MAX9759 amplifier driver");
206MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
207MODULE_LICENSE("GPL");
208
