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122 lines
3.3 KiB
122 lines
3.3 KiB
/* |
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* ALSA ASoC Machine Driver for Allo Piano DAC |
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* |
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* Author: Baswaraj K <[email protected]> |
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* Copyright 2016 |
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* based on code by Daniel Matuschek <[email protected]> |
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* based on code by Florian Meier <[email protected]> |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* version 2 as published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* General Public License for more details. |
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*/ |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <sound/core.h> |
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#include <sound/pcm.h> |
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#include <sound/pcm_params.h> |
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#include <sound/soc.h> |
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static bool digital_gain_0db_limit = true; |
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static int snd_allo_piano_dac_init(struct snd_soc_pcm_runtime *rtd) |
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{ |
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if (digital_gain_0db_limit) { |
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int ret; |
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struct snd_soc_card *card = rtd->card; |
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ret = snd_soc_limit_volume(card, "Digital Playback Volume", |
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207); |
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if (ret < 0) |
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dev_warn(card->dev, "Failed to set volume limit: %d\n", |
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ret); |
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} |
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return 0; |
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} |
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SND_SOC_DAILINK_DEFS(allo_piano_dai, |
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DAILINK_COMP_ARRAY(COMP_CPU("bcm2708-i2s.0")), |
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DAILINK_COMP_ARRAY(COMP_CODEC("pcm512x.1-004c", "pcm512x-hifi")), |
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DAILINK_COMP_ARRAY(COMP_PLATFORM("bcm2708-i2s.0"))); |
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static struct snd_soc_dai_link snd_allo_piano_dac_dai[] = { |
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{ |
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.name = "Piano DAC", |
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.stream_name = "Piano DAC HiFi", |
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.dai_fmt = SND_SOC_DAIFMT_I2S | |
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SND_SOC_DAIFMT_NB_NF | |
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SND_SOC_DAIFMT_CBS_CFS, |
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.init = snd_allo_piano_dac_init, |
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SND_SOC_DAILINK_REG(allo_piano_dai), |
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}, |
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}; |
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/* audio machine driver */ |
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static struct snd_soc_card snd_allo_piano_dac = { |
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.name = "PianoDAC", |
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.owner = THIS_MODULE, |
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.dai_link = snd_allo_piano_dac_dai, |
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.num_links = ARRAY_SIZE(snd_allo_piano_dac_dai), |
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}; |
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static int snd_allo_piano_dac_probe(struct platform_device *pdev) |
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{ |
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int ret = 0; |
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snd_allo_piano_dac.dev = &pdev->dev; |
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if (pdev->dev.of_node) { |
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struct device_node *i2s_node; |
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struct snd_soc_dai_link *dai; |
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dai = &snd_allo_piano_dac_dai[0]; |
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i2s_node = of_parse_phandle(pdev->dev.of_node, |
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"i2s-controller", 0); |
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if (i2s_node) { |
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dai->cpus->dai_name = NULL; |
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dai->cpus->of_node = i2s_node; |
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dai->platforms->name = NULL; |
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dai->platforms->of_node = i2s_node; |
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} |
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digital_gain_0db_limit = !of_property_read_bool( |
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pdev->dev.of_node, "allo,24db_digital_gain"); |
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} |
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ret = devm_snd_soc_register_card(&pdev->dev, &snd_allo_piano_dac); |
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if (ret && ret != -EPROBE_DEFER) |
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dev_err(&pdev->dev, |
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"snd_soc_register_card() failed: %d\n", ret); |
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return ret; |
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} |
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static const struct of_device_id snd_allo_piano_dac_of_match[] = { |
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{ .compatible = "allo,piano-dac", }, |
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{ /* sentinel */ }, |
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}; |
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MODULE_DEVICE_TABLE(of, snd_allo_piano_dac_of_match); |
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static struct platform_driver snd_allo_piano_dac_driver = { |
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.driver = { |
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.name = "snd-allo-piano-dac", |
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.owner = THIS_MODULE, |
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.of_match_table = snd_allo_piano_dac_of_match, |
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}, |
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.probe = snd_allo_piano_dac_probe, |
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}; |
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module_platform_driver(snd_allo_piano_dac_driver); |
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MODULE_AUTHOR("Baswaraj K <[email protected]>"); |
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MODULE_DESCRIPTION("ALSA ASoC Machine Driver for Allo Piano DAC"); |
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MODULE_LICENSE("GPL v2");
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