diff options
Diffstat (limited to 'sound/soc/bcm/allo-piano-dac.c')
| -rw-r--r-- | sound/soc/bcm/allo-piano-dac.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/sound/soc/bcm/allo-piano-dac.c b/sound/soc/bcm/allo-piano-dac.c new file mode 100644 index 000000000000..61640fb95431 --- /dev/null +++ b/sound/soc/bcm/allo-piano-dac.c @@ -0,0 +1,122 @@ +/* + * ALSA ASoC Machine Driver for Allo Piano DAC + * + * Author: Baswaraj K <jaikumar@cem-solutions.net> + * Copyright 2016 + * based on code by Daniel Matuschek <info@crazy-audio.com> + * based on code by Florian Meier <florian.meier@koalo.de> + * + * 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/platform_device.h> + +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> + +static bool digital_gain_0db_limit = true; + +static int snd_allo_piano_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; +} + +SND_SOC_DAILINK_DEFS(allo_piano_dai, + 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_allo_piano_dac_dai[] = { +{ + .name = "Piano DAC", + .stream_name = "Piano DAC HiFi", + .dai_fmt = SND_SOC_DAIFMT_I2S | + SND_SOC_DAIFMT_NB_NF | + SND_SOC_DAIFMT_CBS_CFS, + .init = snd_allo_piano_dac_init, + SND_SOC_DAILINK_REG(allo_piano_dai), +}, +}; + +/* audio machine driver */ +static struct snd_soc_card snd_allo_piano_dac = { + .name = "PianoDAC", + .owner = THIS_MODULE, + .dai_link = snd_allo_piano_dac_dai, + .num_links = ARRAY_SIZE(snd_allo_piano_dac_dai), +}; + +static int snd_allo_piano_dac_probe(struct platform_device *pdev) +{ + int ret = 0; + + snd_allo_piano_dac.dev = &pdev->dev; + + if (pdev->dev.of_node) { + struct device_node *i2s_node; + struct snd_soc_dai_link *dai; + + dai = &snd_allo_piano_dac_dai[0]; + 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, "allo,24db_digital_gain"); + } + + ret = devm_snd_soc_register_card(&pdev->dev, &snd_allo_piano_dac); + 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 snd_allo_piano_dac_of_match[] = { + { .compatible = "allo,piano-dac", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, snd_allo_piano_dac_of_match); + +static struct platform_driver snd_allo_piano_dac_driver = { + .driver = { + .name = "snd-allo-piano-dac", + .owner = THIS_MODULE, + .of_match_table = snd_allo_piano_dac_of_match, + }, + .probe = snd_allo_piano_dac_probe, +}; + +module_platform_driver(snd_allo_piano_dac_driver); + +MODULE_AUTHOR("Baswaraj K <jaikumar@cem-solutions.net>"); +MODULE_DESCRIPTION("ALSA ASoC Machine Driver for Allo Piano DAC"); +MODULE_LICENSE("GPL v2"); |