diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0069-Add-IQaudIO-Sound-Card-support-for-Raspberry-Pi.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0069-Add-IQaudIO-Sound-Card-support-for-Raspberry-Pi.patch | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0069-Add-IQaudIO-Sound-Card-support-for-Raspberry-Pi.patch b/target/linux/brcm2708/patches-4.4/0069-Add-IQaudIO-Sound-Card-support-for-Raspberry-Pi.patch new file mode 100644 index 0000000000..8d5d4cee8f --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0069-Add-IQaudIO-Sound-Card-support-for-Raspberry-Pi.patch @@ -0,0 +1,178 @@ +From 288238307a79e6978bb475bac7098832ca3de373 Mon Sep 17 00:00:00 2001 +From: Gordon Garrity <gordon@iqaudio.com> +Date: Sat, 8 Mar 2014 16:56:57 +0000 +Subject: [PATCH 069/127] Add IQaudIO Sound Card support for Raspberry Pi + +Set a limit of 0dB on Digital Volume Control + +The main volume control in the PCM512x DAC has a range up to ++24dB. This is dangerously loud and can potentially cause massive +clipping in the output stages. Therefore this sets a sensible +limit of 0dB for this control. +--- + sound/soc/bcm/Kconfig | 7 +++ + sound/soc/bcm/Makefile | 2 + + sound/soc/bcm/iqaudio-dac.c | 132 ++++++++++++++++++++++++++++++++++++++++++++ + 3 files changed, 141 insertions(+) + create mode 100644 sound/soc/bcm/iqaudio-dac.c + +--- a/sound/soc/bcm/Kconfig ++++ b/sound/soc/bcm/Kconfig +@@ -28,3 +28,10 @@ config SND_BCM2708_SOC_RPI_DAC + select SND_SOC_PCM1794A + help + Say Y or M if you want to add support for RPi-DAC. ++ ++config SND_BCM2708_SOC_IQAUDIO_DAC ++ tristate "Support for IQaudIO-DAC" ++ depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S ++ select SND_SOC_PCM512x_I2C ++ help ++ Say Y or M if you want to add support for IQaudIO-DAC. +--- a/sound/soc/bcm/Makefile ++++ b/sound/soc/bcm/Makefile +@@ -7,7 +7,9 @@ obj-$(CONFIG_SND_BCM2835_SOC_I2S) += snd + snd-soc-hifiberry-dac-objs := hifiberry_dac.o + snd-soc-hifiberry-digi-objs := hifiberry_digi.o + snd-soc-rpi-dac-objs := rpi-dac.o ++snd-soc-iqaudio-dac-objs := iqaudio-dac.o + + obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o + obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DIGI) += snd-soc-hifiberry-digi.o + obj-$(CONFIG_SND_BCM2708_SOC_RPI_DAC) += snd-soc-rpi-dac.o ++obj-$(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC) += snd-soc-iqaudio-dac.o +--- /dev/null ++++ b/sound/soc/bcm/iqaudio-dac.c +@@ -0,0 +1,132 @@ ++/* ++ * 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/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 int snd_rpi_iqaudio_dac_init(struct snd_soc_pcm_runtime *rtd) ++{ ++ 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 int snd_rpi_iqaudio_dac_hw_params(struct snd_pcm_substream *substream, ++ struct snd_pcm_hw_params *params) ++{ ++ struct snd_soc_pcm_runtime *rtd = substream->private_data; ++// NOT USED struct snd_soc_dai *codec_dai = rtd->codec_dai; ++// NOT USED struct snd_soc_codec *codec = rtd->codec; ++ 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_iqaudio_dac_ops = { ++ .hw_params = snd_rpi_iqaudio_dac_hw_params, ++}; ++ ++static struct snd_soc_dai_link snd_rpi_iqaudio_dac_dai[] = { ++{ ++ .name = "IQaudIO DAC", ++ .stream_name = "IQaudIO DAC HiFi", ++ .cpu_dai_name = "bcm2708-i2s.0", ++ .codec_dai_name = "pcm512x-hifi", ++ .platform_name = "bcm2708-i2s.0", ++ .codec_name = "pcm512x.1-004c", ++ .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | ++ SND_SOC_DAIFMT_CBS_CFS, ++ .ops = &snd_rpi_iqaudio_dac_ops, ++ .init = snd_rpi_iqaudio_dac_init, ++}, ++}; ++ ++/* audio machine driver */ ++static struct snd_soc_card snd_rpi_iqaudio_dac = { ++ .name = "IQaudIODAC", ++ .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; ++ ++ snd_rpi_iqaudio_dac.dev = &pdev->dev; ++ ++ if (pdev->dev.of_node) { ++ struct device_node *i2s_node; ++ struct snd_soc_dai_link *dai = &snd_rpi_iqaudio_dac_dai[0]; ++ i2s_node = of_parse_phandle(pdev->dev.of_node, ++ "i2s-controller", 0); ++ ++ if (i2s_node) { ++ dai->cpu_dai_name = NULL; ++ dai->cpu_of_node = i2s_node; ++ dai->platform_name = NULL; ++ dai->platform_of_node = i2s_node; ++ } ++ } ++ ++ ret = snd_soc_register_card(&snd_rpi_iqaudio_dac); ++ if (ret) ++ dev_err(&pdev->dev, ++ "snd_soc_register_card() failed: %d\n", ret); ++ ++ return ret; ++} ++ ++static int snd_rpi_iqaudio_dac_remove(struct platform_device *pdev) ++{ ++ 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"); |