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