diff options
Diffstat (limited to 'sound/soc/bcm/iqaudio-dac.c')
| -rw-r--r-- | sound/soc/bcm/iqaudio-dac.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/sound/soc/bcm/iqaudio-dac.c b/sound/soc/bcm/iqaudio-dac.c new file mode 100644 index 000000000000..62f64c843219 --- /dev/null +++ b/sound/soc/bcm/iqaudio-dac.c @@ -0,0 +1,223 @@ +/* + * ASoC Driver for IQaudIO DAC + * + * Author: Florian Meier <florian.meier@koalo.de> + * Copyright 2013 + * + * 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/gpio/consumer.h> +#include <linux/platform_device.h> + +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> +#include <sound/jack.h> + +static bool digital_gain_0db_limit = true; + +static struct gpio_desc *mute_gpio; + +static int snd_rpi_iqaudio_dac_init(struct snd_soc_pcm_runtime *rtd) +{ + if (digital_gain_0db_limit) + { + int ret; + struct snd_soc_card *card = rtd->card; + + ret = snd_soc_limit_volume(card, "Digital Playback Volume", 207); + if (ret < 0) + dev_warn(card->dev, "Failed to set volume limit: %d\n", ret); + } + + return 0; +} + +static void snd_rpi_iqaudio_gpio_mute(struct snd_soc_card *card) +{ + if (mute_gpio) { + dev_info(card->dev, "%s: muting amp using GPIO22\n", + __func__); + gpiod_set_value_cansleep(mute_gpio, 0); + } +} + +static void snd_rpi_iqaudio_gpio_unmute(struct snd_soc_card *card) +{ + if (mute_gpio) { + dev_info(card->dev, "%s: un-muting amp using GPIO22\n", + __func__); + gpiod_set_value_cansleep(mute_gpio, 1); + } +} + +static int snd_rpi_iqaudio_set_bias_level(struct snd_soc_card *card, + struct snd_soc_dapm_context *dapm, enum snd_soc_bias_level level) +{ + struct snd_soc_pcm_runtime *rtd; + struct snd_soc_dai *codec_dai; + + rtd = snd_soc_get_pcm_runtime(card, &card->dai_link[0]); + codec_dai = asoc_rtd_to_codec(rtd, 0); + + if (dapm->dev != codec_dai->dev) + return 0; + + switch (level) { + case SND_SOC_BIAS_PREPARE: + if (dapm->bias_level != SND_SOC_BIAS_STANDBY) + break; + + /* UNMUTE AMP */ + snd_rpi_iqaudio_gpio_unmute(card); + + break; + case SND_SOC_BIAS_STANDBY: + if (dapm->bias_level != SND_SOC_BIAS_PREPARE) + break; + + /* MUTE AMP */ + snd_rpi_iqaudio_gpio_mute(card); + + break; + default: + break; + } + + return 0; +} + +SND_SOC_DAILINK_DEFS(hifi, + DAILINK_COMP_ARRAY(COMP_CPU("bcm2708-i2s.0")), + DAILINK_COMP_ARRAY(COMP_CODEC("pcm512x.1-004c", "pcm512x-hifi")), + DAILINK_COMP_ARRAY(COMP_PLATFORM("bcm2708-i2s.0"))); + +static struct snd_soc_dai_link snd_rpi_iqaudio_dac_dai[] = { +{ + .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | + SND_SOC_DAIFMT_CBS_CFS, + .init = snd_rpi_iqaudio_dac_init, + SND_SOC_DAILINK_REG(hifi), +}, +}; + +/* audio machine driver */ +static struct snd_soc_card snd_rpi_iqaudio_dac = { + .owner = THIS_MODULE, + .dai_link = snd_rpi_iqaudio_dac_dai, + .num_links = ARRAY_SIZE(snd_rpi_iqaudio_dac_dai), +}; + +static int snd_rpi_iqaudio_dac_probe(struct platform_device *pdev) +{ + int ret = 0; + bool gpio_unmute = false; + + snd_rpi_iqaudio_dac.dev = &pdev->dev; + + if (pdev->dev.of_node) { + struct device_node *i2s_node; + struct snd_soc_card *card = &snd_rpi_iqaudio_dac; + struct snd_soc_dai_link *dai = &snd_rpi_iqaudio_dac_dai[0]; + bool auto_gpio_mute = false; + + 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; + } + + digital_gain_0db_limit = !of_property_read_bool( + pdev->dev.of_node, "iqaudio,24db_digital_gain"); + + if (of_property_read_string(pdev->dev.of_node, "card_name", + &card->name)) + card->name = "IQaudIODAC"; + + if (of_property_read_string(pdev->dev.of_node, "dai_name", + &dai->name)) + dai->name = "IQaudIO DAC"; + + if (of_property_read_string(pdev->dev.of_node, + "dai_stream_name", &dai->stream_name)) + dai->stream_name = "IQaudIO DAC HiFi"; + + /* gpio_unmute - one time unmute amp using GPIO */ + gpio_unmute = of_property_read_bool(pdev->dev.of_node, + "iqaudio-dac,unmute-amp"); + + /* auto_gpio_mute - mute/unmute amp using GPIO */ + auto_gpio_mute = of_property_read_bool(pdev->dev.of_node, + "iqaudio-dac,auto-mute-amp"); + + if (auto_gpio_mute || gpio_unmute) { + mute_gpio = devm_gpiod_get_optional(&pdev->dev, "mute", + GPIOD_OUT_LOW); + if (IS_ERR(mute_gpio)) { + ret = PTR_ERR(mute_gpio); + dev_err(&pdev->dev, + "Failed to get mute gpio: %d\n", ret); + return ret; + } + + if (auto_gpio_mute && mute_gpio) + snd_rpi_iqaudio_dac.set_bias_level = + snd_rpi_iqaudio_set_bias_level; + } + } + + ret = snd_soc_register_card(&snd_rpi_iqaudio_dac); + if (ret) { + if (ret != -EPROBE_DEFER) + dev_err(&pdev->dev, + "snd_soc_register_card() failed: %d\n", ret); + return ret; + } + + if (gpio_unmute && mute_gpio) + snd_rpi_iqaudio_gpio_unmute(&snd_rpi_iqaudio_dac); + + return 0; +} + +static int snd_rpi_iqaudio_dac_remove(struct platform_device *pdev) +{ + snd_rpi_iqaudio_gpio_mute(&snd_rpi_iqaudio_dac); + + return snd_soc_unregister_card(&snd_rpi_iqaudio_dac); +} + +static const struct of_device_id iqaudio_of_match[] = { + { .compatible = "iqaudio,iqaudio-dac", }, + {}, +}; +MODULE_DEVICE_TABLE(of, iqaudio_of_match); + +static struct platform_driver snd_rpi_iqaudio_dac_driver = { + .driver = { + .name = "snd-rpi-iqaudio-dac", + .owner = THIS_MODULE, + .of_match_table = iqaudio_of_match, + }, + .probe = snd_rpi_iqaudio_dac_probe, + .remove = snd_rpi_iqaudio_dac_remove, +}; + +module_platform_driver(snd_rpi_iqaudio_dac_driver); + +MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>"); +MODULE_DESCRIPTION("ASoC Driver for IQAudio DAC"); +MODULE_LICENSE("GPL v2"); |