1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * sam9g20_wm8731  --  SoC audio for AT91SAM9G20-based
4 * 			ATMEL AT91SAM9G20ek board.
5 *
6 *  Copyright (C) 2005 SAN People
7 *  Copyright (C) 2008 Atmel
8 *
9 * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
10 *
11 * Based on ati_b1_wm8731.c by:
12 * Frank Mandarino <fmandarino@endrelia.com>
13 * Copyright 2006 Endrelia Technologies Inc.
14 * Based on corgi.c by:
15 * Copyright 2005 Wolfson Microelectronics PLC.
16 * Copyright 2005 Openedhand Ltd.
17 */
18
19#include <linux/module.h>
20#include <linux/moduleparam.h>
21#include <linux/kernel.h>
22#include <linux/clk.h>
23#include <linux/timer.h>
24#include <linux/interrupt.h>
25#include <linux/platform_device.h>
26#include <linux/of.h>
27
28#include <linux/atmel-ssc.h>
29
30#include <sound/core.h>
31#include <sound/pcm.h>
32#include <sound/pcm_params.h>
33#include <sound/soc.h>
34
35#include "../codecs/wm8731.h"
36#include "atmel-pcm.h"
37#include "atmel_ssc_dai.h"
38
39#define MCLK_RATE 12000000
40
41/*
42 * As shipped the board does not have inputs.  However, it is relatively
43 * straightforward to modify the board to hook them up so support is left
44 * in the driver.
45 */
46#undef ENABLE_MIC_INPUT
47
48static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
49	SND_SOC_DAPM_MIC("Int Mic", NULL),
50	SND_SOC_DAPM_SPK("Ext Spk", NULL),
51};
52
53static const struct snd_soc_dapm_route intercon[] = {
54
55	/* speaker connected to LHPOUT/RHPOUT */
56	{"Ext Spk", NULL, "LHPOUT"},
57	{"Ext Spk", NULL, "RHPOUT"},
58
59	/* mic is connected to Mic Jack, with WM8731 Mic Bias */
60	{"MICIN", NULL, "Mic Bias"},
61	{"Mic Bias", NULL, "Int Mic"},
62};
63
64/*
65 * Logic for a wm8731 as connected on a at91sam9g20ek board.
66 */
67static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
68{
69	struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
70	struct device *dev = rtd->dev;
71	int ret;
72
73	dev_dbg(dev, "%s called\n", __func__);
74
75	ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
76				     MCLK_RATE, SND_SOC_CLOCK_IN);
77	if (ret < 0) {
78		dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
79		return ret;
80	}
81
82#ifndef ENABLE_MIC_INPUT
83	snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
84#endif
85
86	return 0;
87}
88
89SND_SOC_DAILINK_DEFS(pcm,
90	DAILINK_COMP_ARRAY(COMP_CPU("at91rm9200_ssc.0")),
91	DAILINK_COMP_ARRAY(COMP_CODEC("wm8731.0-001b", "wm8731-hifi")),
92	DAILINK_COMP_ARRAY(COMP_PLATFORM("at91rm9200_ssc.0")));
93
94static struct snd_soc_dai_link at91sam9g20ek_dai = {
95	.name = "WM8731",
96	.stream_name = "WM8731 PCM",
97	.init = at91sam9g20ek_wm8731_init,
98	.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
99		   SND_SOC_DAIFMT_CBP_CFP,
100#ifndef ENABLE_MIC_INPUT
101	.playback_only = true,
102#endif
103	SND_SOC_DAILINK_REG(pcm),
104};
105
106static struct snd_soc_card snd_soc_at91sam9g20ek = {
107	.name = "AT91SAMG20-EK",
108	.owner = THIS_MODULE,
109	.dai_link = &at91sam9g20ek_dai,
110	.num_links = 1,
111
112	.dapm_widgets = at91sam9g20ek_dapm_widgets,
113	.num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
114	.dapm_routes = intercon,
115	.num_dapm_routes = ARRAY_SIZE(intercon),
116	.fully_routed = true,
117};
118
119static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
120{
121	struct device_node *np = pdev->dev.of_node;
122	struct device_node *codec_np, *cpu_np;
123	struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
124	int ret;
125
126	if (!np) {
127		return -ENODEV;
128	}
129
130	ret = atmel_ssc_set_audio(0);
131	if (ret) {
132		dev_err(&pdev->dev, "ssc channel is not valid: %d\n", ret);
133		return ret;
134	}
135
136	card->dev = &pdev->dev;
137
138	/* Parse device node info */
139	ret = snd_soc_of_parse_card_name(card, "atmel,model");
140	if (ret)
141		goto err;
142
143	ret = snd_soc_of_parse_audio_routing(card,
144		"atmel,audio-routing");
145	if (ret)
146		goto err;
147
148	/* Parse codec info */
149	at91sam9g20ek_dai.codecs->name = NULL;
150	codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
151	if (!codec_np) {
152		dev_err(&pdev->dev, "codec info missing\n");
153		ret = -EINVAL;
154		goto err;
155	}
156	at91sam9g20ek_dai.codecs->of_node = codec_np;
157
158	/* Parse dai and platform info */
159	at91sam9g20ek_dai.cpus->dai_name = NULL;
160	at91sam9g20ek_dai.platforms->name = NULL;
161	cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
162	if (!cpu_np) {
163		dev_err(&pdev->dev, "dai and pcm info missing\n");
164		of_node_put(codec_np);
165		ret = -EINVAL;
166		goto err;
167	}
168	at91sam9g20ek_dai.cpus->of_node = cpu_np;
169	at91sam9g20ek_dai.platforms->of_node = cpu_np;
170
171	of_node_put(codec_np);
172	of_node_put(cpu_np);
173
174	ret = snd_soc_register_card(card);
175	if (ret) {
176		dev_err_probe(&pdev->dev, ret,
177			      "snd_soc_register_card() failed\n");
178		goto err;
179	}
180
181	return 0;
182
183err:
184	atmel_ssc_put_audio(0);
185	return ret;
186}
187
188static void at91sam9g20ek_audio_remove(struct platform_device *pdev)
189{
190	struct snd_soc_card *card = platform_get_drvdata(pdev);
191
192	snd_soc_unregister_card(card);
193	atmel_ssc_put_audio(0);
194}
195
196#ifdef CONFIG_OF
197static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
198	{ .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
199	{ }
200};
201MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
202#endif
203
204static struct platform_driver at91sam9g20ek_audio_driver = {
205	.driver = {
206		.name	= "at91sam9g20ek-audio",
207		.of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
208	},
209	.probe	= at91sam9g20ek_audio_probe,
210	.remove_new = at91sam9g20ek_audio_remove,
211};
212
213module_platform_driver(at91sam9g20ek_audio_driver);
214
215/* Module information */
216MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
217MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
218MODULE_ALIAS("platform:at91sam9g20ek-audio");
219MODULE_LICENSE("GPL");
220