From 65a3e3f912faa5d0c0cdb937b23e641d45608236 Mon Sep 17 00:00:00 2001 From: Florian Meier Date: Fri, 22 Nov 2013 19:19:08 +0100 Subject: [PATCH 037/121] ASoC: Add support for HifiBerry DAC This adds a machine driver for the HifiBerry DAC. It is a sound card that can be stacked onto the Raspberry Pi. Signed-off-by: Florian Meier --- sound/soc/bcm/Kconfig | 7 +++ sound/soc/bcm/Makefile | 5 +++ sound/soc/bcm/hifiberry_dac.c | 100 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 112 insertions(+) create mode 100644 sound/soc/bcm/hifiberry_dac.c --- a/sound/soc/bcm/Kconfig +++ b/sound/soc/bcm/Kconfig @@ -18,3 +18,10 @@ config SND_BCM2708_SOC_I2S Say Y or M if you want to add support for codecs attached to the BCM2708 I2S interface. You will also need to select the audio interfaces to support below. + +config SND_BCM2708_SOC_HIFIBERRY_DAC + tristate "Support for HifiBerry DAC" + depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S + select SND_SOC_PCM5102A + help + Say Y or M if you want to add support for HifiBerry DAC. --- a/sound/soc/bcm/Makefile +++ b/sound/soc/bcm/Makefile @@ -7,3 +7,8 @@ obj-$(CONFIG_SND_BCM2835_SOC_I2S) += snd snd-soc-bcm2708-i2s-objs := bcm2708-i2s.o obj-$(CONFIG_SND_BCM2708_SOC_I2S) += snd-soc-bcm2708-i2s.o + +# BCM2708 Machine Support +snd-soc-hifiberry-dac-objs := hifiberry_dac.o + +obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o --- /dev/null +++ b/sound/soc/bcm/hifiberry_dac.c @@ -0,0 +1,100 @@ +/* + * ASoC Driver for HifiBerry DAC + * + * Author: Florian Meier + * 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 +#include + +#include +#include +#include +#include +#include + +static int snd_rpi_hifiberry_dac_init(struct snd_soc_pcm_runtime *rtd) +{ + return 0; +} + +static int snd_rpi_hifiberry_dac_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_dai *cpu_dai = rtd->cpu_dai; + + unsigned int sample_bits = + snd_pcm_format_physical_width(params_format(params)); + + return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2); +} + +/* machine stream operations */ +static struct snd_soc_ops snd_rpi_hifiberry_dac_ops = { + .hw_params = snd_rpi_hifiberry_dac_hw_params, +}; + +static struct snd_soc_dai_link snd_rpi_hifiberry_dac_dai[] = { +{ + .name = "HifiBerry DAC", + .stream_name = "HifiBerry DAC HiFi", + .cpu_dai_name = "bcm2708-i2s.0", + .codec_dai_name = "pcm5102a-hifi", + .platform_name = "bcm2708-i2s.0", + .codec_name = "pcm5102a-codec", + .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | + SND_SOC_DAIFMT_CBS_CFS, + .ops = &snd_rpi_hifiberry_dac_ops, + .init = snd_rpi_hifiberry_dac_init, +}, +}; + +/* audio machine driver */ +static struct snd_soc_card snd_rpi_hifiberry_dac = { + .name = "snd_rpi_hifiberry_dac", + .dai_link = snd_rpi_hifiberry_dac_dai, + .num_links = ARRAY_SIZE(snd_rpi_hifiberry_dac_dai), +}; + +static int snd_rpi_hifiberry_dac_probe(struct platform_device *pdev) +{ + int ret = 0; + + snd_rpi_hifiberry_dac.dev = &pdev->dev; + ret = snd_soc_register_card(&snd_rpi_hifiberry_dac); + if (ret) + dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", ret); + + return ret; +} + +static int snd_rpi_hifiberry_dac_remove(struct platform_device *pdev) +{ + return snd_soc_unregister_card(&snd_rpi_hifiberry_dac); +} + +static struct platform_driver snd_rpi_hifiberry_dac_driver = { + .driver = { + .name = "snd-hifiberry-dac", + .owner = THIS_MODULE, + }, + .probe = snd_rpi_hifiberry_dac_probe, + .remove = snd_rpi_hifiberry_dac_remove, +}; + +module_platform_driver(snd_rpi_hifiberry_dac_driver); + +MODULE_AUTHOR("Florian Meier "); +MODULE_DESCRIPTION("ASoC Driver for HifiBerry DAC"); +MODULE_LICENSE("GPL v2");