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(dapm: 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(desc: priv->gpiod_shutdown, value: 0); |
33 | else |
34 | gpiod_set_value_cansleep(desc: priv->gpiod_shutdown, value: 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(desc: priv->gpiod_gain->desc[0], |
75 | value: speaker_gain_table[priv->gain][0]); |
76 | /* G2 */ |
77 | gpiod_set_value_cansleep(desc: priv->gpiod_gain->desc[1], |
78 | value: 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(desc: priv->gpiod_mute, value: 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, size: sizeof(*priv), GFP_KERNEL); |
146 | if (!priv) |
147 | return -ENOMEM; |
148 | |
149 | platform_set_drvdata(pdev, data: priv); |
150 | |
151 | priv->gpiod_shutdown = devm_gpiod_get(dev, con_id: "shutdown" , flags: GPIOD_OUT_HIGH); |
152 | if (IS_ERR(ptr: priv->gpiod_shutdown)) |
153 | return dev_err_probe(dev, err: PTR_ERR(ptr: priv->gpiod_shutdown), |
154 | fmt: "Failed to get 'shutdown' gpio" ); |
155 | |
156 | priv->gpiod_mute = devm_gpiod_get(dev, con_id: "mute" , flags: GPIOD_OUT_HIGH); |
157 | if (IS_ERR(ptr: priv->gpiod_mute)) |
158 | return dev_err_probe(dev, err: PTR_ERR(ptr: priv->gpiod_mute), |
159 | fmt: "Failed to get 'mute' gpio" ); |
160 | priv->is_mute = true; |
161 | |
162 | priv->gpiod_gain = devm_gpiod_get_array(dev, con_id: "gain" , flags: GPIOD_OUT_HIGH); |
163 | if (IS_ERR(ptr: priv->gpiod_gain)) |
164 | return dev_err_probe(dev, err: PTR_ERR(ptr: priv->gpiod_gain), |
165 | fmt: "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, component_driver: &max9759_component_driver, |
175 | NULL, num_dai: 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 | |