1/*
2 * sam9x5_wm8731   --	SoC audio for AT91SAM9X5-based boards
3 *			that are using WM8731 as codec.
4 *
5 *  Copyright (C) 2011 Atmel,
6 *		  Nicolas Ferre <nicolas.ferre@atmel.com>
7 *
8 *  Copyright (C) 2013 Paratronic,
9 *		  Richard Genoud <richard.genoud@gmail.com>
10 *
11 * Based on sam9g20_wm8731.c by:
12 * Sedji Gaouaou <sedji.gaouaou@atmel.com>
13 *
14 *  This program is free software; you can redistribute  it and/or modify it
15 *  under  the terms of  the GNU General  Public License as published by the
16 *  Free Software Foundation;  either version 2 of the  License, or (at your
17 *  option) any later version.
18 *
19 */
20#include <linux/of.h>
21#include <linux/export.h>
22#include <linux/module.h>
23#include <linux/mod_devicetable.h>
24#include <linux/platform_device.h>
25#include <linux/device.h>
26
27#include <sound/soc.h>
28#include <sound/soc-dai.h>
29#include <sound/soc-dapm.h>
30
31#include "../codecs/wm8731.h"
32#include "atmel_ssc_dai.h"
33
34
35#define MCLK_RATE 12288000
36
37#define DRV_NAME "sam9x5-snd-wm8731"
38
39struct sam9x5_drvdata {
40	int ssc_id;
41};
42
43/*
44 * Logic for a wm8731 as connected on a at91sam9x5ek based board.
45 */
46static int sam9x5_wm8731_init(struct snd_soc_pcm_runtime *rtd)
47{
48	struct snd_soc_dai *codec_dai = rtd->codec_dai;
49	struct device *dev = rtd->dev;
50	int ret;
51
52	dev_dbg(dev, "ASoC: %s called\n", __func__);
53
54	/* set the codec system clock for DAC and ADC */
55	ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
56				     MCLK_RATE, SND_SOC_CLOCK_IN);
57	if (ret < 0) {
58		dev_err(dev, "ASoC: Failed to set WM8731 SYSCLK: %d\n", ret);
59		return ret;
60	}
61
62	return 0;
63}
64
65/*
66 * Audio paths on at91sam9x5ek board:
67 *
68 *  |A| ------------> |      | ---R----> Headphone Jack
69 *  |T| <----\        |  WM  | ---L--/
70 *  |9| ---> CLK <--> | 8731 | <--R----- Line In Jack
71 *  |1| <------------ |      | <--L--/
72 */
73static const struct snd_soc_dapm_widget sam9x5_dapm_widgets[] = {
74	SND_SOC_DAPM_HP("Headphone Jack", NULL),
75	SND_SOC_DAPM_LINE("Line In Jack", NULL),
76};
77
78static int sam9x5_wm8731_driver_probe(struct platform_device *pdev)
79{
80	struct device_node *np = pdev->dev.of_node;
81	struct device_node *codec_np, *cpu_np;
82	struct snd_soc_card *card;
83	struct snd_soc_dai_link *dai;
84	struct sam9x5_drvdata *priv;
85	int ret;
86
87	if (!np) {
88		dev_err(&pdev->dev, "No device node supplied\n");
89		return -EINVAL;
90	}
91
92	card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);
93	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
94	dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL);
95	if (!dai || !card || !priv) {
96		ret = -ENOMEM;
97		goto out;
98	}
99
100	snd_soc_card_set_drvdata(card, priv);
101
102	card->dev = &pdev->dev;
103	card->owner = THIS_MODULE;
104	card->dai_link = dai;
105	card->num_links = 1;
106	card->dapm_widgets = sam9x5_dapm_widgets;
107	card->num_dapm_widgets = ARRAY_SIZE(sam9x5_dapm_widgets);
108	dai->name = "WM8731";
109	dai->stream_name = "WM8731 PCM";
110	dai->codec_dai_name = "wm8731-hifi";
111	dai->init = sam9x5_wm8731_init;
112	dai->dai_fmt = SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF
113		| SND_SOC_DAIFMT_CBM_CFM;
114
115	ret = snd_soc_of_parse_card_name(card, "atmel,model");
116	if (ret) {
117		dev_err(&pdev->dev, "atmel,model node missing\n");
118		goto out;
119	}
120
121	ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing");
122	if (ret) {
123		dev_err(&pdev->dev, "atmel,audio-routing node missing\n");
124		goto out;
125	}
126
127	codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
128	if (!codec_np) {
129		dev_err(&pdev->dev, "atmel,audio-codec node missing\n");
130		ret = -EINVAL;
131		goto out;
132	}
133
134	dai->codec_of_node = codec_np;
135
136	cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
137	if (!cpu_np) {
138		dev_err(&pdev->dev, "atmel,ssc-controller node missing\n");
139		ret = -EINVAL;
140		goto out;
141	}
142	dai->cpu_of_node = cpu_np;
143	dai->platform_of_node = cpu_np;
144
145	priv->ssc_id = of_alias_get_id(cpu_np, "ssc");
146
147	ret = atmel_ssc_set_audio(priv->ssc_id);
148	if (ret != 0) {
149		dev_err(&pdev->dev,
150			"ASoC: Failed to set SSC %d for audio: %d\n",
151			ret, priv->ssc_id);
152		goto out;
153	}
154
155	of_node_put(codec_np);
156	of_node_put(cpu_np);
157
158	ret = snd_soc_register_card(card);
159	if (ret) {
160		dev_err(&pdev->dev,
161			"ASoC: Platform device allocation failed\n");
162		goto out_put_audio;
163	}
164
165	dev_dbg(&pdev->dev, "ASoC: %s ok\n", __func__);
166
167	return ret;
168
169out_put_audio:
170	atmel_ssc_put_audio(priv->ssc_id);
171out:
172	return ret;
173}
174
175static int sam9x5_wm8731_driver_remove(struct platform_device *pdev)
176{
177	struct snd_soc_card *card = platform_get_drvdata(pdev);
178	struct sam9x5_drvdata *priv = card->drvdata;
179
180	snd_soc_unregister_card(card);
181	atmel_ssc_put_audio(priv->ssc_id);
182
183	return 0;
184}
185
186static const struct of_device_id sam9x5_wm8731_of_match[] = {
187	{ .compatible = "atmel,sam9x5-wm8731-audio", },
188	{},
189};
190MODULE_DEVICE_TABLE(of, sam9x5_wm8731_of_match);
191
192static struct platform_driver sam9x5_wm8731_driver = {
193	.driver = {
194		.name = DRV_NAME,
195		.of_match_table = of_match_ptr(sam9x5_wm8731_of_match),
196	},
197	.probe = sam9x5_wm8731_driver_probe,
198	.remove = sam9x5_wm8731_driver_remove,
199};
200module_platform_driver(sam9x5_wm8731_driver);
201
202/* Module information */
203MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
204MODULE_AUTHOR("Richard Genoud <richard.genoud@gmail.com>");
205MODULE_DESCRIPTION("ALSA SoC machine driver for AT91SAM9x5 - WM8731");
206MODULE_LICENSE("GPL");
207MODULE_ALIAS("platform:" DRV_NAME);
208