// SPDX-License-Identifier: GPL-2.0-only /* * ASoC driver for PROTO AudioCODEC (with a WM8731) * * Author: Florian Meier, <koalo@koalo.de> * Copyright 2013 */ #include <linux/module.h> #include <linux/platform_device.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/soc.h> #include <sound/jack.h> #include "../codecs/wm8731.h" #define XTAL_RATE 12288000 /* This is fixed on this board */ static int snd_proto_init(struct snd_soc_pcm_runtime *rtd) { struct snd_soc_card *card = rtd->card; struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0); /* Set proto sysclk */ int ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL, XTAL_RATE, SND_SOC_CLOCK_IN); if (ret < 0) { dev_err(card->dev, "Failed to set WM8731 SYSCLK: %d\n", ret); return ret; } return 0; } static const struct snd_soc_dapm_widget snd_proto_widget[] = { SND_SOC_DAPM_MIC("Microphone Jack", NULL), SND_SOC_DAPM_HP("Headphone Jack", NULL), }; static const struct snd_soc_dapm_route snd_proto_route[] = { /* speaker connected to LHPOUT/RHPOUT */ {"Headphone Jack", NULL, "LHPOUT"}, {"Headphone Jack", NULL, "RHPOUT"}, /* mic is connected to Mic Jack, with WM8731 Mic Bias */ {"MICIN", NULL, "Mic Bias"}, {"Mic Bias", NULL, "Microphone Jack"}, }; /* audio machine driver */ static struct snd_soc_card snd_proto = { .name = "snd_mikroe_proto", .owner = THIS_MODULE, .dapm_widgets = snd_proto_widget, .num_dapm_widgets = ARRAY_SIZE(snd_proto_widget), .dapm_routes = snd_proto_route, .num_dapm_routes = ARRAY_SIZE(snd_proto_route), }; static int snd_proto_probe(struct platform_device *pdev) { struct snd_soc_dai_link *dai; struct snd_soc_dai_link_component *comp; struct device_node *np = pdev->dev.of_node; struct device_node *codec_np, *cpu_np; struct device_node *bitclkmaster = NULL; struct device_node *framemaster = NULL; unsigned int dai_fmt; int ret = 0; if (!np) { dev_err(&pdev->dev, "No device node supplied\n"); return -EINVAL; } snd_proto.dev = &pdev->dev; ret = snd_soc_of_parse_card_name(&snd_proto, "model"); if (ret) return ret; dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL); if (!dai) return -ENOMEM; /* for cpus/codecs/platforms */ comp = devm_kzalloc(&pdev->dev, 3 * sizeof(*comp), GFP_KERNEL); if (!comp) return -ENOMEM; snd_proto.dai_link = dai; snd_proto.num_links = 1; dai->cpus = &comp[0]; dai->num_cpus = 1; dai->codecs = &comp[1]; dai->num_codecs = 1; dai->platforms = &comp[2]; dai->num_platforms = 1; dai->name = "WM8731"; dai->stream_name = "WM8731 HiFi"; dai->codecs->dai_name = "wm8731-hifi"; dai->init = &snd_proto_init; codec_np = of_parse_phandle(np, "audio-codec", 0); if (!codec_np) { dev_err(&pdev->dev, "audio-codec node missing\n"); return -EINVAL; } dai->codecs->of_node = codec_np; cpu_np = of_parse_phandle(np, "i2s-controller", 0); if (!cpu_np) { dev_err(&pdev->dev, "i2s-controller missing\n"); return -EINVAL; } dai->cpus->of_node = cpu_np; dai->platforms->of_node = cpu_np; dai_fmt = snd_soc_of_parse_daifmt(np, NULL, &bitclkmaster, &framemaster); if (bitclkmaster != framemaster) { dev_err(&pdev->dev, "Must be the same bitclock and frame master\n"); return -EINVAL; } if (bitclkmaster) { dai_fmt &= ~SND_SOC_DAIFMT_MASTER_MASK; if (codec_np == bitclkmaster) dai_fmt |= SND_SOC_DAIFMT_CBM_CFM; else dai_fmt |= SND_SOC_DAIFMT_CBS_CFS; } of_node_put(bitclkmaster); of_node_put(framemaster); dai->dai_fmt = dai_fmt; of_node_put(codec_np); of_node_put(cpu_np); ret = snd_soc_register_card(&snd_proto); if (ret && ret != -EPROBE_DEFER) dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", ret); return ret; } static int snd_proto_remove(struct platform_device *pdev) { return snd_soc_unregister_card(&snd_proto); } static const struct of_device_id snd_proto_of_match[] = { { .compatible = "mikroe,mikroe-proto", }, {}, }; MODULE_DEVICE_TABLE(of, snd_proto_of_match); static struct platform_driver snd_proto_driver = { .driver = { .name = "snd-mikroe-proto", .of_match_table = snd_proto_of_match, }, .probe = snd_proto_probe, .remove = snd_proto_remove, }; module_platform_driver(snd_proto_driver); MODULE_AUTHOR("Florian Meier"); MODULE_DESCRIPTION("ASoC Driver for PROTO board (WM8731)"); MODULE_LICENSE("GPL");