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/i2c.h>
27#include <linux/of.h>
28
29#include <linux/atmel-ssc.h>
30
31#include <sound/core.h>
32#include <sound/pcm.h>
33#include <sound/pcm_params.h>
34#include <sound/soc.h>
35
36#include "../codecs/wm8731.h"
37#include "atmel-pcm.h"
38#include "atmel_ssc_dai.h"
39
40#define MCLK_RATE 12000000
41
42/*
43 * As shipped the board does not have inputs.  However, it is relatively
44 * straightforward to modify the board to hook them up so support is left
45 * in the driver.
46 */
47#undef ENABLE_MIC_INPUT
48
49static struct clk *mclk;
50
51static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
52					struct snd_soc_dapm_context *dapm,
53					enum snd_soc_bias_level level)
54{
55	static int mclk_on;
56	int ret = 0;
57
58	switch (level) {
59	case SND_SOC_BIAS_ON:
60	case SND_SOC_BIAS_PREPARE:
61		if (!mclk_on)
62			ret = clk_enable(mclk);
63		if (ret == 0)
64			mclk_on = 1;
65		break;
66
67	case SND_SOC_BIAS_OFF:
68	case SND_SOC_BIAS_STANDBY:
69		if (mclk_on)
70			clk_disable(mclk);
71		mclk_on = 0;
72		break;
73	}
74
75	return ret;
76}
77
78static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
79	SND_SOC_DAPM_MIC("Int Mic", NULL),
80	SND_SOC_DAPM_SPK("Ext Spk", NULL),
81};
82
83static const struct snd_soc_dapm_route intercon[] = {
84
85	/* speaker connected to LHPOUT/RHPOUT */
86	{"Ext Spk", NULL, "LHPOUT"},
87	{"Ext Spk", NULL, "RHPOUT"},
88
89	/* mic is connected to Mic Jack, with WM8731 Mic Bias */
90	{"MICIN", NULL, "Mic Bias"},
91	{"Mic Bias", NULL, "Int Mic"},
92};
93
94/*
95 * Logic for a wm8731 as connected on a at91sam9g20ek board.
96 */
97static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
98{
99	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
100	struct device *dev = rtd->dev;
101	int ret;
102
103	dev_dbg(dev, "%s called\n", __func__);
104
105	ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
106				     MCLK_RATE, SND_SOC_CLOCK_IN);
107	if (ret < 0) {
108		dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
109		return ret;
110	}
111
112#ifndef ENABLE_MIC_INPUT
113	snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
114#endif
115
116	return 0;
117}
118
119SND_SOC_DAILINK_DEFS(pcm,
120	DAILINK_COMP_ARRAY(COMP_CPU("at91rm9200_ssc.0")),
121	DAILINK_COMP_ARRAY(COMP_CODEC("wm8731.0-001b", "wm8731-hifi")),
122	DAILINK_COMP_ARRAY(COMP_PLATFORM("at91rm9200_ssc.0")));
123
124static struct snd_soc_dai_link at91sam9g20ek_dai = {
125	.name = "WM8731",
126	.stream_name = "WM8731 PCM",
127	.init = at91sam9g20ek_wm8731_init,
128	.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
129		   SND_SOC_DAIFMT_CBM_CFM,
130	SND_SOC_DAILINK_REG(pcm),
131};
132
133static struct snd_soc_card snd_soc_at91sam9g20ek = {
134	.name = "AT91SAMG20-EK",
135	.owner = THIS_MODULE,
136	.dai_link = &at91sam9g20ek_dai,
137	.num_links = 1,
138	.set_bias_level = at91sam9g20ek_set_bias_level,
139
140	.dapm_widgets = at91sam9g20ek_dapm_widgets,
141	.num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
142	.dapm_routes = intercon,
143	.num_dapm_routes = ARRAY_SIZE(intercon),
144	.fully_routed = true,
145};
146
147static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
148{
149	struct device_node *np = pdev->dev.of_node;
150	struct device_node *codec_np, *cpu_np;
151	struct clk *pllb;
152	struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
153	int ret;
154
155	if (!np) {
156		return -ENODEV;
157	}
158
159	ret = atmel_ssc_set_audio(0);
160	if (ret) {
161		dev_err(&pdev->dev, "ssc channel is not valid\n");
162		return -EINVAL;
163	}
164
165	/*
166	 * Codec MCLK is supplied by PCK0 - set it up.
167	 */
168	mclk = clk_get(NULL, "pck0");
169	if (IS_ERR(mclk)) {
170		dev_err(&pdev->dev, "Failed to get MCLK\n");
171		ret = PTR_ERR(mclk);
172		goto err;
173	}
174
175	pllb = clk_get(NULL, "pllb");
176	if (IS_ERR(pllb)) {
177		dev_err(&pdev->dev, "Failed to get PLLB\n");
178		ret = PTR_ERR(pllb);
179		goto err_mclk;
180	}
181	ret = clk_set_parent(mclk, pllb);
182	clk_put(pllb);
183	if (ret != 0) {
184		dev_err(&pdev->dev, "Failed to set MCLK parent\n");
185		goto err_mclk;
186	}
187
188	clk_set_rate(mclk, MCLK_RATE);
189
190	card->dev = &pdev->dev;
191
192	/* Parse device node info */
193	ret = snd_soc_of_parse_card_name(card, "atmel,model");
194	if (ret)
195		goto err;
196
197	ret = snd_soc_of_parse_audio_routing(card,
198		"atmel,audio-routing");
199	if (ret)
200		goto err;
201
202	/* Parse codec info */
203	at91sam9g20ek_dai.codecs->name = NULL;
204	codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
205	if (!codec_np) {
206		dev_err(&pdev->dev, "codec info missing\n");
207		return -EINVAL;
208	}
209	at91sam9g20ek_dai.codecs->of_node = codec_np;
210
211	/* Parse dai and platform info */
212	at91sam9g20ek_dai.cpus->dai_name = NULL;
213	at91sam9g20ek_dai.platforms->name = NULL;
214	cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
215	if (!cpu_np) {
216		dev_err(&pdev->dev, "dai and pcm info missing\n");
217		of_node_put(codec_np);
218		return -EINVAL;
219	}
220	at91sam9g20ek_dai.cpus->of_node = cpu_np;
221	at91sam9g20ek_dai.platforms->of_node = cpu_np;
222
223	of_node_put(codec_np);
224	of_node_put(cpu_np);
225
226	ret = snd_soc_register_card(card);
227	if (ret) {
228		dev_err(&pdev->dev, "snd_soc_register_card() failed\n");
229	}
230
231	return ret;
232
233err_mclk:
234	clk_put(mclk);
235	mclk = NULL;
236err:
237	atmel_ssc_put_audio(0);
238	return ret;
239}
240
241static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
242{
243	struct snd_soc_card *card = platform_get_drvdata(pdev);
244
245	clk_disable(mclk);
246	mclk = NULL;
247	snd_soc_unregister_card(card);
248	atmel_ssc_put_audio(0);
249
250	return 0;
251}
252
253#ifdef CONFIG_OF
254static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
255	{ .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
256	{ }
257};
258MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
259#endif
260
261static struct platform_driver at91sam9g20ek_audio_driver = {
262	.driver = {
263		.name	= "at91sam9g20ek-audio",
264		.of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
265	},
266	.probe	= at91sam9g20ek_audio_probe,
267	.remove	= at91sam9g20ek_audio_remove,
268};
269
270module_platform_driver(at91sam9g20ek_audio_driver);
271
272/* Module information */
273MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
274MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
275MODULE_ALIAS("platform:at91sam9g20ek-audio");
276MODULE_LICENSE("GPL");
277