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/*
* ASoC Driver for AudioInjector Pi add on soundcard
*
* Created on: 13-May-2016
* Author: flatmax@flatmax.org
* based on code by Cliff Cai <Cliff.Cai@analog.com> for the ssm2602 machine blackfin.
* with help from Lars-Peter Clausen for simplifying the original code to use the dai_fmt field.
* i2s_node code taken from the other sound/soc/bcm machine drivers.
*
* Copyright (C) 2016 Flatmax Pty. Ltd.
*
* 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/types.h>
#include <sound/core.h>
#include <sound/soc.h>
#include <sound/pcm_params.h>
#include <sound/control.h>
#include "../codecs/wm8731.h"
static const unsigned int bcm2835_rates_12000000[] = {
32000, 44100, 48000, 96000, 88200,
};
static struct snd_pcm_hw_constraint_list bcm2835_constraints_12000000 = {
.list = bcm2835_rates_12000000,
.count = ARRAY_SIZE(bcm2835_rates_12000000),
};
static int snd_audioinjector_pi_soundcard_startup(struct snd_pcm_substream *substream)
{
/* Setup constraints, because there is a 12 MHz XTAL on the board */
snd_pcm_hw_constraint_list(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_RATE,
&bcm2835_constraints_12000000);
return 0;
}
static int snd_audioinjector_pi_soundcard_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;
switch (params_rate(params)){
case 8000:
return snd_soc_dai_set_bclk_ratio(cpu_dai, 1508);
case 32000:
return snd_soc_dai_set_bclk_ratio(cpu_dai, 378);
case 44100:
return snd_soc_dai_set_bclk_ratio(cpu_dai, 274);
case 48000:
return snd_soc_dai_set_bclk_ratio(cpu_dai, 252);
case 88200:
return snd_soc_dai_set_bclk_ratio(cpu_dai, 136);
case 96000:
return snd_soc_dai_set_bclk_ratio(cpu_dai, 126);
default:
return snd_soc_dai_set_bclk_ratio(cpu_dai, 126);
}
}
/* machine stream operations */
static struct snd_soc_ops snd_audioinjector_pi_soundcard_ops = {
.startup = snd_audioinjector_pi_soundcard_startup,
.hw_params = snd_audioinjector_pi_soundcard_hw_params,
};
static int audioinjector_pi_soundcard_dai_init(struct snd_soc_pcm_runtime *rtd)
{
return snd_soc_dai_set_sysclk(rtd->codec_dai, WM8731_SYSCLK_XTAL, 12000000, SND_SOC_CLOCK_IN);
}
static struct snd_soc_dai_link audioinjector_pi_soundcard_dai[] = {
{
.name = "AudioInjector audio",
.stream_name = "AudioInjector audio",
.cpu_dai_name = "bcm2708-i2s.0",
.codec_dai_name = "wm8731-hifi",
.platform_name = "bcm2835-i2s.0",
.codec_name = "wm8731.1-001a",
.ops = &snd_audioinjector_pi_soundcard_ops,
.init = audioinjector_pi_soundcard_dai_init,
.dai_fmt = SND_SOC_DAIFMT_CBM_CFM|SND_SOC_DAIFMT_I2S|SND_SOC_DAIFMT_NB_NF,
},
};
static const struct snd_soc_dapm_widget wm8731_dapm_widgets[] = {
SND_SOC_DAPM_HP("Headphone Jack", NULL),
SND_SOC_DAPM_SPK("Ext Spk", NULL),
SND_SOC_DAPM_LINE("Line In Jacks", NULL),
SND_SOC_DAPM_MIC("Microphone", NULL),
};
static const struct snd_soc_dapm_route audioinjector_audio_map[] = {
/* headphone connected to LHPOUT, RHPOUT */
{"Headphone Jack", NULL, "LHPOUT"},
{"Headphone Jack", NULL, "RHPOUT"},
/* speaker connected to LOUT, ROUT */
{"Ext Spk", NULL, "ROUT"},
{"Ext Spk", NULL, "LOUT"},
/* line inputs */
{"Line In Jacks", NULL, "Line Input"},
/* mic is connected to Mic Jack, with WM8731 Mic Bias */
{"Microphone", NULL, "Mic Bias"},
};
static struct snd_soc_card snd_soc_audioinjector = {
.name = "audioinjector-pi-soundcard",
.dai_link = audioinjector_pi_soundcard_dai,
.num_links = ARRAY_SIZE(audioinjector_pi_soundcard_dai),
.dapm_widgets = wm8731_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(wm8731_dapm_widgets),
.dapm_routes = audioinjector_audio_map,
.num_dapm_routes = ARRAY_SIZE(audioinjector_audio_map),
};
static int audioinjector_pi_soundcard_probe(struct platform_device *pdev)
{
struct snd_soc_card *card = &snd_soc_audioinjector;
int ret;
card->dev = &pdev->dev;
if (pdev->dev.of_node) {
struct snd_soc_dai_link *dai = &audioinjector_pi_soundcard_dai[0];
struct device_node *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;
} else
if (!dai->cpu_of_node) {
dev_err(&pdev->dev, "Property 'i2s-controller' missing or invalid\n");
return -EINVAL;
}
}
if ((ret = snd_soc_register_card(card))) {
dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
}
return ret;
}
static int audioinjector_pi_soundcard_remove(struct platform_device *pdev)
{
struct snd_soc_card *card = platform_get_drvdata(pdev);
return snd_soc_unregister_card(card);
}
static const struct of_device_id audioinjector_pi_soundcard_of_match[] = {
{ .compatible = "ai,audioinjector-pi-soundcard", },
{},
};
MODULE_DEVICE_TABLE(of, audioinjector_pi_soundcard_of_match);
static struct platform_driver audioinjector_pi_soundcard_driver = {
.driver = {
.name = "audioinjector-audio",
.owner = THIS_MODULE,
.of_match_table = audioinjector_pi_soundcard_of_match,
},
.probe = audioinjector_pi_soundcard_probe,
.remove = audioinjector_pi_soundcard_remove,
};
module_platform_driver(audioinjector_pi_soundcard_driver);
MODULE_AUTHOR("Matt Flax <flatmax@flatmax.org>");
MODULE_DESCRIPTION("AudioInjector.net Pi Soundcard");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:audioinjector-pi-soundcard");
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