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223 lines
5.6 KiB
223 lines
5.6 KiB
/* |
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* ASoC Driver for IQaudIO DAC |
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* |
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* Author: Florian Meier <[email protected]> |
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* Copyright 2013 |
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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/gpio/consumer.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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#include <sound/jack.h> |
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static bool digital_gain_0db_limit = true; |
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static struct gpio_desc *mute_gpio; |
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static int snd_rpi_iqaudio_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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{ |
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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", 207); |
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if (ret < 0) |
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dev_warn(card->dev, "Failed to set volume limit: %d\n", ret); |
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} |
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return 0; |
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} |
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static void snd_rpi_iqaudio_gpio_mute(struct snd_soc_card *card) |
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{ |
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if (mute_gpio) { |
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dev_info(card->dev, "%s: muting amp using GPIO22\n", |
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__func__); |
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gpiod_set_value_cansleep(mute_gpio, 0); |
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} |
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} |
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static void snd_rpi_iqaudio_gpio_unmute(struct snd_soc_card *card) |
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{ |
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if (mute_gpio) { |
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dev_info(card->dev, "%s: un-muting amp using GPIO22\n", |
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__func__); |
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gpiod_set_value_cansleep(mute_gpio, 1); |
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} |
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} |
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static int snd_rpi_iqaudio_set_bias_level(struct snd_soc_card *card, |
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struct snd_soc_dapm_context *dapm, enum snd_soc_bias_level level) |
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{ |
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struct snd_soc_pcm_runtime *rtd; |
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struct snd_soc_dai *codec_dai; |
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rtd = snd_soc_get_pcm_runtime(card, &card->dai_link[0]); |
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codec_dai = asoc_rtd_to_codec(rtd, 0); |
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if (dapm->dev != codec_dai->dev) |
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return 0; |
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switch (level) { |
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case SND_SOC_BIAS_PREPARE: |
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if (dapm->bias_level != SND_SOC_BIAS_STANDBY) |
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break; |
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/* UNMUTE AMP */ |
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snd_rpi_iqaudio_gpio_unmute(card); |
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break; |
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case SND_SOC_BIAS_STANDBY: |
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if (dapm->bias_level != SND_SOC_BIAS_PREPARE) |
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break; |
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/* MUTE AMP */ |
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snd_rpi_iqaudio_gpio_mute(card); |
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break; |
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default: |
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break; |
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} |
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return 0; |
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} |
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SND_SOC_DAILINK_DEFS(hifi, |
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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_rpi_iqaudio_dac_dai[] = { |
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{ |
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.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | |
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SND_SOC_DAIFMT_CBS_CFS, |
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.init = snd_rpi_iqaudio_dac_init, |
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SND_SOC_DAILINK_REG(hifi), |
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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_rpi_iqaudio_dac = { |
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.owner = THIS_MODULE, |
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.dai_link = snd_rpi_iqaudio_dac_dai, |
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.num_links = ARRAY_SIZE(snd_rpi_iqaudio_dac_dai), |
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}; |
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static int snd_rpi_iqaudio_dac_probe(struct platform_device *pdev) |
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{ |
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int ret = 0; |
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bool gpio_unmute = false; |
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snd_rpi_iqaudio_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_card *card = &snd_rpi_iqaudio_dac; |
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struct snd_soc_dai_link *dai = &snd_rpi_iqaudio_dac_dai[0]; |
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bool auto_gpio_mute = false; |
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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, "iqaudio,24db_digital_gain"); |
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if (of_property_read_string(pdev->dev.of_node, "card_name", |
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&card->name)) |
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card->name = "IQaudIODAC"; |
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if (of_property_read_string(pdev->dev.of_node, "dai_name", |
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&dai->name)) |
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dai->name = "IQaudIO DAC"; |
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if (of_property_read_string(pdev->dev.of_node, |
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"dai_stream_name", &dai->stream_name)) |
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dai->stream_name = "IQaudIO DAC HiFi"; |
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/* gpio_unmute - one time unmute amp using GPIO */ |
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gpio_unmute = of_property_read_bool(pdev->dev.of_node, |
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"iqaudio-dac,unmute-amp"); |
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/* auto_gpio_mute - mute/unmute amp using GPIO */ |
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auto_gpio_mute = of_property_read_bool(pdev->dev.of_node, |
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"iqaudio-dac,auto-mute-amp"); |
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if (auto_gpio_mute || gpio_unmute) { |
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mute_gpio = devm_gpiod_get_optional(&pdev->dev, "mute", |
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GPIOD_OUT_LOW); |
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if (IS_ERR(mute_gpio)) { |
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ret = PTR_ERR(mute_gpio); |
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dev_err(&pdev->dev, |
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"Failed to get mute gpio: %d\n", ret); |
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return ret; |
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} |
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if (auto_gpio_mute && mute_gpio) |
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snd_rpi_iqaudio_dac.set_bias_level = |
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snd_rpi_iqaudio_set_bias_level; |
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} |
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} |
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ret = snd_soc_register_card(&snd_rpi_iqaudio_dac); |
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if (ret) { |
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if (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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if (gpio_unmute && mute_gpio) |
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snd_rpi_iqaudio_gpio_unmute(&snd_rpi_iqaudio_dac); |
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return 0; |
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} |
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static int snd_rpi_iqaudio_dac_remove(struct platform_device *pdev) |
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{ |
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snd_rpi_iqaudio_gpio_mute(&snd_rpi_iqaudio_dac); |
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return snd_soc_unregister_card(&snd_rpi_iqaudio_dac); |
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} |
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static const struct of_device_id iqaudio_of_match[] = { |
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{ .compatible = "iqaudio,iqaudio-dac", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, iqaudio_of_match); |
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static struct platform_driver snd_rpi_iqaudio_dac_driver = { |
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.driver = { |
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.name = "snd-rpi-iqaudio-dac", |
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.owner = THIS_MODULE, |
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.of_match_table = iqaudio_of_match, |
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}, |
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.probe = snd_rpi_iqaudio_dac_probe, |
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.remove = snd_rpi_iqaudio_dac_remove, |
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}; |
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module_platform_driver(snd_rpi_iqaudio_dac_driver); |
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MODULE_AUTHOR("Florian Meier <[email protected]>"); |
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MODULE_DESCRIPTION("ASoC Driver for IQAudio DAC"); |
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MODULE_LICENSE("GPL v2");
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