1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * ASoC driver for PROTO AudioCODEC (with a WM8731)
  4 *
  5 * Author:      Florian Meier, <koalo@koalo.de>
  6 *	      Copyright 2013
  7 */
  8
  9#include <linux/module.h>
 10#include <linux/platform_device.h>
 11
 12#include <sound/core.h>
 13#include <sound/pcm.h>
 14#include <sound/soc.h>
 15#include <sound/jack.h>
 16
 17#include "../codecs/wm8731.h"
 18
 19#define XTAL_RATE 12288000	/* This is fixed on this board */
 20
 21static int snd_proto_init(struct snd_soc_pcm_runtime *rtd)
 22{
 23	struct snd_soc_card *card = rtd->card;
 24	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
 25
 26	/* Set proto sysclk */
 27	int ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
 28					 XTAL_RATE, SND_SOC_CLOCK_IN);
 29	if (ret < 0) {
 30		dev_err(card->dev, "Failed to set WM8731 SYSCLK: %d\n",
 31			ret);
 32		return ret;
 33	}
 34
 35	return 0;
 36}
 37
 38static const struct snd_soc_dapm_widget snd_proto_widget[] = {
 39	SND_SOC_DAPM_MIC("Microphone Jack", NULL),
 40	SND_SOC_DAPM_HP("Headphone Jack", NULL),
 41};
 42
 43static const struct snd_soc_dapm_route snd_proto_route[] = {
 44	/* speaker connected to LHPOUT/RHPOUT */
 45	{"Headphone Jack", NULL, "LHPOUT"},
 46	{"Headphone Jack", NULL, "RHPOUT"},
 47
 48	/* mic is connected to Mic Jack, with WM8731 Mic Bias */
 49	{"MICIN", NULL, "Mic Bias"},
 50	{"Mic Bias", NULL, "Microphone Jack"},
 51};
 52
 53/* audio machine driver */
 54static struct snd_soc_card snd_proto = {
 55	.name		= "snd_mikroe_proto",
 56	.owner		= THIS_MODULE,
 57	.dapm_widgets	= snd_proto_widget,
 58	.num_dapm_widgets = ARRAY_SIZE(snd_proto_widget),
 59	.dapm_routes	= snd_proto_route,
 60	.num_dapm_routes = ARRAY_SIZE(snd_proto_route),
 61};
 62
 63static int snd_proto_probe(struct platform_device *pdev)
 64{
 65	struct snd_soc_dai_link *dai;
 66	struct snd_soc_dai_link_component *comp;
 67	struct device_node *np = pdev->dev.of_node;
 68	struct device_node *codec_np, *cpu_np;
 69	struct device_node *bitclkmaster = NULL;
 70	struct device_node *framemaster = NULL;
 71	unsigned int dai_fmt;
 72	int ret = 0;
 73
 74	if (!np) {
 75		dev_err(&pdev->dev, "No device node supplied\n");
 76		return -EINVAL;
 77	}
 78
 79	snd_proto.dev = &pdev->dev;
 80	ret = snd_soc_of_parse_card_name(&snd_proto, "model");
 81	if (ret)
 82		return ret;
 83
 84	dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL);
 85	if (!dai)
 86		return -ENOMEM;
 87
 88	/* for cpus/codecs/platforms */
 89	comp = devm_kzalloc(&pdev->dev, 3 * sizeof(*comp), GFP_KERNEL);
 90	if (!comp)
 91		return -ENOMEM;
 92
 93	snd_proto.dai_link = dai;
 94	snd_proto.num_links = 1;
 95
 96	dai->cpus = &comp[0];
 97	dai->num_cpus = 1;
 98	dai->codecs = &comp[1];
 99	dai->num_codecs = 1;
100	dai->platforms = &comp[2];
101	dai->num_platforms = 1;
102
103	dai->name = "WM8731";
104	dai->stream_name = "WM8731 HiFi";
105	dai->codecs->dai_name = "wm8731-hifi";
106	dai->init = &snd_proto_init;
107
108	codec_np = of_parse_phandle(np, "audio-codec", 0);
109	if (!codec_np) {
110		dev_err(&pdev->dev, "audio-codec node missing\n");
111		return -EINVAL;
112	}
113	dai->codecs->of_node = codec_np;
114
115	cpu_np = of_parse_phandle(np, "i2s-controller", 0);
116	if (!cpu_np) {
117		dev_err(&pdev->dev, "i2s-controller missing\n");
118		ret = -EINVAL;
119		goto put_codec_node;
120	}
121	dai->cpus->of_node = cpu_np;
122	dai->platforms->of_node = cpu_np;
123
124	dai_fmt = snd_soc_daifmt_parse_format(np, NULL);
125	snd_soc_daifmt_parse_clock_provider_as_phandle(np, NULL,
126						       &bitclkmaster, &framemaster);
127	if (bitclkmaster != framemaster) {
128		dev_err(&pdev->dev, "Must be the same bitclock and frame master\n");
129		ret = -EINVAL;
130		goto put_cpu_node;
131	}
132	if (bitclkmaster) {
133		if (codec_np == bitclkmaster)
134			dai_fmt |= SND_SOC_DAIFMT_CBP_CFP;
135		else
136			dai_fmt |= SND_SOC_DAIFMT_CBC_CFC;
137	} else {
138		dai_fmt |= snd_soc_daifmt_parse_clock_provider_as_flag(np, NULL);
139	}
140
141
142	dai->dai_fmt = dai_fmt;
143	ret = snd_soc_register_card(&snd_proto);
144	if (ret)
145		dev_err_probe(&pdev->dev, ret,
146			"snd_soc_register_card() failed\n");
147
148
149put_cpu_node:
150	of_node_put(bitclkmaster);
151	of_node_put(framemaster);
152	of_node_put(cpu_np);
153put_codec_node:
154	of_node_put(codec_np);
155	return ret;
156}
157
158static int snd_proto_remove(struct platform_device *pdev)
159{
160	snd_soc_unregister_card(&snd_proto);
161
162	return 0;
163}
164
165static const struct of_device_id snd_proto_of_match[] = {
166	{ .compatible = "mikroe,mikroe-proto", },
167	{},
168};
169MODULE_DEVICE_TABLE(of, snd_proto_of_match);
170
171static struct platform_driver snd_proto_driver = {
172	.driver = {
173		.name   = "snd-mikroe-proto",
174		.of_match_table = snd_proto_of_match,
175	},
176	.probe	  = snd_proto_probe,
177	.remove	 = snd_proto_remove,
178};
179
180module_platform_driver(snd_proto_driver);
181
182MODULE_AUTHOR("Florian Meier");
183MODULE_DESCRIPTION("ASoC Driver for PROTO board (WM8731)");
184MODULE_LICENSE("GPL");