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147 lines
3.8 KiB
147 lines
3.8 KiB
/* |
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* ASoC driver for PROTO AudioCODEC (with a WM8731) |
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* connected to a Raspberry Pi |
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* |
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* Author: Florian Meier, <[email protected]> |
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* Copyright 2013 |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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*/ |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <sound/core.h> |
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#include <sound/pcm.h> |
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#include <sound/soc.h> |
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#include <sound/jack.h> |
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#include "../codecs/wm8731.h" |
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static const unsigned int wm8731_rates_12288000[] = { |
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8000, 32000, 48000, 96000, |
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}; |
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static struct snd_pcm_hw_constraint_list wm8731_constraints_12288000 = { |
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.list = wm8731_rates_12288000, |
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.count = ARRAY_SIZE(wm8731_rates_12288000), |
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}; |
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static int snd_rpi_proto_startup(struct snd_pcm_substream *substream) |
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{ |
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/* Setup constraints, because there is a 12.288 MHz XTAL on the board */ |
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snd_pcm_hw_constraint_list(substream->runtime, 0, |
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SNDRV_PCM_HW_PARAM_RATE, |
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&wm8731_constraints_12288000); |
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return 0; |
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} |
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static int snd_rpi_proto_hw_params(struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *params) |
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{ |
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struct snd_soc_pcm_runtime *rtd = substream->private_data; |
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struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0); |
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struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0); |
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int sysclk = 12288000; /* This is fixed on this board */ |
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/* Set proto bclk */ |
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int ret = snd_soc_dai_set_bclk_ratio(cpu_dai,32*2); |
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if (ret < 0){ |
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dev_err(rtd->card->dev, |
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"Failed to set BCLK ratio %d\n", ret); |
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return ret; |
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} |
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/* Set proto sysclk */ |
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ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL, |
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sysclk, SND_SOC_CLOCK_IN); |
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if (ret < 0) { |
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dev_err(rtd->card->dev, |
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"Failed to set WM8731 SYSCLK: %d\n", ret); |
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return ret; |
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} |
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return 0; |
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} |
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/* machine stream operations */ |
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static struct snd_soc_ops snd_rpi_proto_ops = { |
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.startup = snd_rpi_proto_startup, |
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.hw_params = snd_rpi_proto_hw_params, |
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}; |
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SND_SOC_DAILINK_DEFS(rpi_proto, |
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DAILINK_COMP_ARRAY(COMP_CPU("bcm2708-i2s.0")), |
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DAILINK_COMP_ARRAY(COMP_CODEC("wm8731.1-001a", "wm8731-hifi")), |
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DAILINK_COMP_ARRAY(COMP_PLATFORM("bcm2708-i2s.0"))); |
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static struct snd_soc_dai_link snd_rpi_proto_dai[] = { |
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{ |
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.name = "WM8731", |
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.stream_name = "WM8731 HiFi", |
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.dai_fmt = SND_SOC_DAIFMT_I2S |
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| SND_SOC_DAIFMT_NB_NF |
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| SND_SOC_DAIFMT_CBM_CFM, |
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.ops = &snd_rpi_proto_ops, |
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SND_SOC_DAILINK_REG(rpi_proto), |
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}, |
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}; |
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/* audio machine driver */ |
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static struct snd_soc_card snd_rpi_proto = { |
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.name = "snd_rpi_proto", |
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.owner = THIS_MODULE, |
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.dai_link = snd_rpi_proto_dai, |
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.num_links = ARRAY_SIZE(snd_rpi_proto_dai), |
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}; |
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static int snd_rpi_proto_probe(struct platform_device *pdev) |
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{ |
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int ret = 0; |
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snd_rpi_proto.dev = &pdev->dev; |
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if (pdev->dev.of_node) { |
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struct device_node *i2s_node; |
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struct snd_soc_dai_link *dai = &snd_rpi_proto_dai[0]; |
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i2s_node = of_parse_phandle(pdev->dev.of_node, |
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"i2s-controller", 0); |
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if (i2s_node) { |
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dai->cpus->dai_name = NULL; |
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dai->cpus->of_node = i2s_node; |
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dai->platforms->name = NULL; |
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dai->platforms->of_node = i2s_node; |
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} |
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} |
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ret = devm_snd_soc_register_card(&pdev->dev, &snd_rpi_proto); |
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if (ret && ret != -EPROBE_DEFER) |
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dev_err(&pdev->dev, |
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"snd_soc_register_card() failed: %d\n", ret); |
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return ret; |
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} |
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static const struct of_device_id snd_rpi_proto_of_match[] = { |
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{ .compatible = "rpi,rpi-proto", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, snd_rpi_proto_of_match); |
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static struct platform_driver snd_rpi_proto_driver = { |
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.driver = { |
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.name = "snd-rpi-proto", |
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.owner = THIS_MODULE, |
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.of_match_table = snd_rpi_proto_of_match, |
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}, |
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.probe = snd_rpi_proto_probe, |
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}; |
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module_platform_driver(snd_rpi_proto_driver); |
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MODULE_AUTHOR("Florian Meier"); |
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MODULE_DESCRIPTION("ASoC Driver for Raspberry Pi connected to PROTO board (WM8731)"); |
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MODULE_LICENSE("GPL");
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