--- /dev/null
+/*
+ * ASoC Driver for AudioInjector.net isolated soundcard
+ *
+ * Created on: 20-February-2020
+ * Author: flatmax@flatmax.org
+ * based on audioinjector-octo-soundcard.c
+ *
+ * Copyright (C) 2020 Flatmax Pty. Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 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.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/gpio/consumer.h>
+
+#include <sound/core.h>
+#include <sound/soc.h>
+#include <sound/pcm_params.h>
+#include <sound/control.h>
+
+static struct gpio_desc *mute_gpio;
+
+static const unsigned int audioinjector_isolated_rates[] = {
+ 192000, 96000, 48000, 32000, 24000, 16000, 8000
+};
+
+static struct snd_pcm_hw_constraint_list audioinjector_isolated_constraints = {
+ .list = audioinjector_isolated_rates,
+ .count = ARRAY_SIZE(audioinjector_isolated_rates),
+};
+
+static int audioinjector_isolated_dai_init(struct snd_soc_pcm_runtime *rtd)
+{
+ int ret=snd_soc_dai_set_sysclk(rtd->codec_dai, 0, 24576000, 0);
+ if (ret)
+ return ret;
+
+ return snd_soc_dai_set_bclk_ratio(rtd->cpu_dai, 64);
+}
+
+static int audioinjector_isolated_startup(struct snd_pcm_substream *substream)
+{
+ snd_pcm_hw_constraint_list(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_RATE, &audioinjector_isolated_constraints);
+
+ return 0;
+}
+
+static int audioinjector_isolated_trigger(struct snd_pcm_substream *substream,
+ int cmd){
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ gpiod_set_value(mute_gpio, 0);
+ break;
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ gpiod_set_value(mute_gpio, 1);
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static struct snd_soc_ops audioinjector_isolated_ops = {
+ .startup = audioinjector_isolated_startup,
+ .trigger = audioinjector_isolated_trigger,
+};
+
+SND_SOC_DAILINK_DEFS(audioinjector_isolated,
+ DAILINK_COMP_ARRAY(COMP_CPU("bcm2708-i2s.0")),
+ DAILINK_COMP_ARRAY(COMP_CODEC("cs4271.1-0010", "cs4271-hifi")),
+ DAILINK_COMP_ARRAY(COMP_PLATFORM("bcm2708-i2s.0")));
+
+static struct snd_soc_dai_link audioinjector_isolated_dai[] = {
+ {
+ .name = "AudioInjector ISO",
+ .stream_name = "AI-HIFI",
+ .ops = &audioinjector_isolated_ops,
+ .init = audioinjector_isolated_dai_init,
+ .symmetric_rates = 1,
+ .symmetric_channels = 1,
+ .dai_fmt = SND_SOC_DAIFMT_CBM_CFM|SND_SOC_DAIFMT_I2S|SND_SOC_DAIFMT_NB_NF,
+ SND_SOC_DAILINK_REG(audioinjector_isolated),
+ }
+};
+
+static const struct snd_soc_dapm_widget audioinjector_isolated_widgets[] = {
+ SND_SOC_DAPM_OUTPUT("OUTPUTS"),
+ SND_SOC_DAPM_INPUT("INPUTS"),
+};
+
+static const struct snd_soc_dapm_route audioinjector_isolated_route[] = {
+ /* Balanced outputs */
+ {"OUTPUTS", NULL, "AOUTA+"},
+ {"OUTPUTS", NULL, "AOUTA-"},
+ {"OUTPUTS", NULL, "AOUTB+"},
+ {"OUTPUTS", NULL, "AOUTB-"},
+
+ /* Balanced inputs */
+ {"AINA", NULL, "INPUTS"},
+ {"AINB", NULL, "INPUTS"},
+};
+
+static struct snd_soc_card snd_soc_audioinjector_isolated = {
+ .name = "audioinjector-isolated-soundcard",
+ .dai_link = audioinjector_isolated_dai,
+ .num_links = ARRAY_SIZE(audioinjector_isolated_dai),
+
+ .dapm_widgets = audioinjector_isolated_widgets,
+ .num_dapm_widgets = ARRAY_SIZE(audioinjector_isolated_widgets),
+ .dapm_routes = audioinjector_isolated_route,
+ .num_dapm_routes = ARRAY_SIZE(audioinjector_isolated_route),
+};
+
+static int audioinjector_isolated_probe(struct platform_device *pdev)
+{
+ struct snd_soc_card *card = &snd_soc_audioinjector_isolated;
+ int ret;
+
+ card->dev = &pdev->dev;
+
+ if (pdev->dev.of_node) {
+ struct snd_soc_dai_link *dai = &audioinjector_isolated_dai[0];
+ struct device_node *i2s_node =
+ of_parse_phandle(pdev->dev.of_node, "i2s-controller", 0);
+
+ if (i2s_node) {
+ dai->cpus->dai_name = NULL;
+ dai->cpus->of_node = i2s_node;
+ dai->platforms->name = NULL;
+ dai->platforms->of_node = i2s_node;
+ } else {
+ dev_err(&pdev->dev,
+ "i2s-controller missing or invalid in DT\n");
+ return -EINVAL;
+ }
+
+ mute_gpio = devm_gpiod_get_optional(&pdev->dev, "mute", GPIOD_OUT_LOW);
+ if (IS_ERR(mute_gpio)){
+ dev_err(&pdev->dev, "mute gpio not found in dt overlay\n");
+ return PTR_ERR(mute_gpio);
+ }
+ }
+
+ ret = devm_snd_soc_register_card(&pdev->dev, card);
+ if (ret && ret != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
+ return ret;
+}
+
+static const struct of_device_id audioinjector_isolated_of_match[] = {
+ { .compatible = "ai,audioinjector-isolated-soundcard", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, audioinjector_isolated_of_match);
+
+static struct platform_driver audioinjector_isolated_driver = {
+ .driver = {
+ .name = "audioinjector-isolated",
+ .owner = THIS_MODULE,
+ .of_match_table = audioinjector_isolated_of_match,
+ },
+ .probe = audioinjector_isolated_probe,
+};
+
+module_platform_driver(audioinjector_isolated_driver);
+MODULE_AUTHOR("Matt Flax <flatmax@flatmax.org>");
+MODULE_DESCRIPTION("AudioInjector.net isolated Soundcard");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:audioinjector-isolated-soundcard");
projects / platform / kernel / linux-rpi.git / commitdiff