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85825d5e JB |
1 | /* |
2 | * Copyright (c) 2017 BayLibre, SAS. | |
3 | * Author: Jerome Brunet <jbrunet@baylibre.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of version 2 of the GNU General Public License as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
16 | * The full GNU General Public License is included in this distribution | |
17 | * in the file called COPYING. | |
18 | */ | |
19 | ||
20 | #include <linux/gpio/consumer.h> | |
21 | #include <linux/module.h> | |
6debd01a | 22 | #include <linux/regulator/consumer.h> |
85825d5e JB |
23 | #include <sound/soc.h> |
24 | ||
8d881bb6 | 25 | #define DRV_NAME "simple-amplifier" |
85825d5e | 26 | |
8d881bb6 | 27 | struct simple_amp { |
85825d5e JB |
28 | struct gpio_desc *gpiod_enable; |
29 | }; | |
30 | ||
31 | static int drv_event(struct snd_soc_dapm_widget *w, | |
32 | struct snd_kcontrol *control, int event) | |
33 | { | |
34 | struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm); | |
8d881bb6 | 35 | struct simple_amp *priv = snd_soc_component_get_drvdata(c); |
85825d5e JB |
36 | int val; |
37 | ||
38 | switch (event) { | |
39 | case SND_SOC_DAPM_POST_PMU: | |
40 | val = 1; | |
41 | break; | |
42 | case SND_SOC_DAPM_PRE_PMD: | |
43 | val = 0; | |
44 | break; | |
45 | default: | |
46 | WARN(1, "Unexpected event"); | |
47 | return -EINVAL; | |
48 | } | |
49 | ||
ea2a2ad1 | 50 | gpiod_set_value_cansleep(priv->gpiod_enable, val); |
85825d5e JB |
51 | |
52 | return 0; | |
53 | } | |
54 | ||
8d881bb6 | 55 | static const struct snd_soc_dapm_widget simple_amp_dapm_widgets[] = { |
85825d5e JB |
56 | SND_SOC_DAPM_INPUT("INL"), |
57 | SND_SOC_DAPM_INPUT("INR"), | |
58 | SND_SOC_DAPM_OUT_DRV_E("DRV", SND_SOC_NOPM, 0, 0, NULL, 0, drv_event, | |
59 | (SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD)), | |
60 | SND_SOC_DAPM_OUTPUT("OUTL"), | |
61 | SND_SOC_DAPM_OUTPUT("OUTR"), | |
6debd01a | 62 | SND_SOC_DAPM_REGULATOR_SUPPLY("VCC", 20, 0), |
85825d5e JB |
63 | }; |
64 | ||
8d881bb6 | 65 | static const struct snd_soc_dapm_route simple_amp_dapm_routes[] = { |
85825d5e JB |
66 | { "DRV", NULL, "INL" }, |
67 | { "DRV", NULL, "INR" }, | |
6debd01a VK |
68 | { "OUTL", NULL, "VCC" }, |
69 | { "OUTR", NULL, "VCC" }, | |
85825d5e JB |
70 | { "OUTL", NULL, "DRV" }, |
71 | { "OUTR", NULL, "DRV" }, | |
72 | }; | |
73 | ||
8d881bb6 JB |
74 | static const struct snd_soc_component_driver simple_amp_component_driver = { |
75 | .dapm_widgets = simple_amp_dapm_widgets, | |
76 | .num_dapm_widgets = ARRAY_SIZE(simple_amp_dapm_widgets), | |
77 | .dapm_routes = simple_amp_dapm_routes, | |
78 | .num_dapm_routes = ARRAY_SIZE(simple_amp_dapm_routes), | |
85825d5e JB |
79 | }; |
80 | ||
8d881bb6 | 81 | static int simple_amp_probe(struct platform_device *pdev) |
85825d5e JB |
82 | { |
83 | struct device *dev = &pdev->dev; | |
8d881bb6 | 84 | struct simple_amp *priv; |
85825d5e JB |
85 | int err; |
86 | ||
87 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
88 | if (priv == NULL) | |
89 | return -ENOMEM; | |
90 | platform_set_drvdata(pdev, priv); | |
91 | ||
2944d29d MJ |
92 | priv->gpiod_enable = devm_gpiod_get_optional(dev, "enable", |
93 | GPIOD_OUT_LOW); | |
85825d5e JB |
94 | if (IS_ERR(priv->gpiod_enable)) { |
95 | err = PTR_ERR(priv->gpiod_enable); | |
96 | if (err != -EPROBE_DEFER) | |
97 | dev_err(dev, "Failed to get 'enable' gpio: %d", err); | |
98 | return err; | |
99 | } | |
100 | ||
8d881bb6 JB |
101 | return devm_snd_soc_register_component(dev, |
102 | &simple_amp_component_driver, | |
85825d5e JB |
103 | NULL, 0); |
104 | } | |
105 | ||
106 | #ifdef CONFIG_OF | |
8d881bb6 | 107 | static const struct of_device_id simple_amp_ids[] = { |
85825d5e | 108 | { .compatible = "dioo,dio2125", }, |
8ed237e8 | 109 | { .compatible = "simple-audio-amplifier", }, |
85825d5e JB |
110 | { } |
111 | }; | |
8d881bb6 | 112 | MODULE_DEVICE_TABLE(of, simple_amp_ids); |
85825d5e JB |
113 | #endif |
114 | ||
8d881bb6 | 115 | static struct platform_driver simple_amp_driver = { |
85825d5e JB |
116 | .driver = { |
117 | .name = DRV_NAME, | |
8d881bb6 | 118 | .of_match_table = of_match_ptr(simple_amp_ids), |
85825d5e | 119 | }, |
8d881bb6 | 120 | .probe = simple_amp_probe, |
85825d5e JB |
121 | }; |
122 | ||
8d881bb6 | 123 | module_platform_driver(simple_amp_driver); |
85825d5e | 124 | |
8d881bb6 | 125 | MODULE_DESCRIPTION("ASoC Simple Audio Amplifier driver"); |
85825d5e JB |
126 | MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>"); |
127 | MODULE_LICENSE("GPL"); |