1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * sam9x5_wm8731 -- SoC audio for AT91SAM9X5-based boards
4 * that are using WM8731 as codec.
5 *
6 * Copyright (C) 2011 Atmel,
7 * Nicolas Ferre <nicolas.ferre@atmel.com>
8 *
9 * Copyright (C) 2013 Paratronic,
10 * Richard Genoud <richard.genoud@gmail.com>
11 *
12 * Based on sam9g20_wm8731.c by:
13 * Sedji Gaouaou <sedji.gaouaou@atmel.com>
14 */
15 #include <linux/of.h>
16 #include <linux/export.h>
17 #include <linux/module.h>
18 #include <linux/mod_devicetable.h>
19 #include <linux/platform_device.h>
20 #include <linux/device.h>
21
22 #include <sound/soc.h>
23 #include <sound/soc-dai.h>
24 #include <sound/soc-dapm.h>
25
26 #include "../codecs/wm8731.h"
27 #include "atmel_ssc_dai.h"
28
29
30 #define MCLK_RATE 12288000
31
32 #define DRV_NAME "sam9x5-snd-wm8731"
33
34 struct sam9x5_drvdata {
35 int ssc_id;
36 };
37
38 /*
39 * Logic for a wm8731 as connected on a at91sam9x5ek based board.
40 */
sam9x5_wm8731_init(struct snd_soc_pcm_runtime * rtd)41 static int sam9x5_wm8731_init(struct snd_soc_pcm_runtime *rtd)
42 {
43 struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
44 struct device *dev = rtd->dev;
45 int ret;
46
47 dev_dbg(dev, "%s called\n", __func__);
48
49 /* set the codec system clock for DAC and ADC */
50 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
51 MCLK_RATE, SND_SOC_CLOCK_IN);
52 if (ret < 0) {
53 dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
54 return ret;
55 }
56
57 return 0;
58 }
59
60 /*
61 * Audio paths on at91sam9x5ek board:
62 *
63 * |A| ------------> | | ---R----> Headphone Jack
64 * |T| <----\ | WM | ---L--/
65 * |9| ---> CLK <--> | 8731 | <--R----- Line In Jack
66 * |1| <------------ | | <--L--/
67 */
68 static const struct snd_soc_dapm_widget sam9x5_dapm_widgets[] = {
69 SND_SOC_DAPM_HP("Headphone Jack", NULL),
70 SND_SOC_DAPM_LINE("Line In Jack", NULL),
71 };
72
sam9x5_wm8731_driver_probe(struct platform_device * pdev)73 static int sam9x5_wm8731_driver_probe(struct platform_device *pdev)
74 {
75 struct device_node *np = pdev->dev.of_node;
76 struct device_node *codec_np, *cpu_np;
77 struct snd_soc_card *card;
78 struct snd_soc_dai_link *dai;
79 struct sam9x5_drvdata *priv;
80 struct snd_soc_dai_link_component *comp;
81 int ret;
82
83 if (!np) {
84 dev_err(&pdev->dev, "No device node supplied\n");
85 return -EINVAL;
86 }
87
88 card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);
89 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
90 dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL);
91 comp = devm_kzalloc(&pdev->dev, 3 * sizeof(*comp), GFP_KERNEL);
92 if (!dai || !card || !priv || !comp) {
93 ret = -ENOMEM;
94 goto out;
95 }
96
97 snd_soc_card_set_drvdata(card, priv);
98
99 card->dev = &pdev->dev;
100 card->owner = THIS_MODULE;
101 card->dai_link = dai;
102 card->num_links = 1;
103 card->dapm_widgets = sam9x5_dapm_widgets;
104 card->num_dapm_widgets = ARRAY_SIZE(sam9x5_dapm_widgets);
105
106 dai->cpus = &comp[0];
107 dai->num_cpus = 1;
108 dai->codecs = &comp[1];
109 dai->num_codecs = 1;
110 dai->platforms = &comp[2];
111 dai->num_platforms = 1;
112
113 dai->name = "WM8731";
114 dai->stream_name = "WM8731 PCM";
115 dai->codecs->dai_name = "wm8731-hifi";
116 dai->init = sam9x5_wm8731_init;
117 dai->dai_fmt = SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF
118 | SND_SOC_DAIFMT_CBP_CFP;
119
120 ret = snd_soc_of_parse_card_name(card, "atmel,model");
121 if (ret) {
122 dev_err(&pdev->dev, "atmel,model node missing\n");
123 goto out;
124 }
125
126 ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing");
127 if (ret) {
128 dev_err(&pdev->dev, "atmel,audio-routing node missing\n");
129 goto out;
130 }
131
132 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
133 if (!codec_np) {
134 dev_err(&pdev->dev, "atmel,audio-codec node missing\n");
135 ret = -EINVAL;
136 goto out;
137 }
138
139 dai->codecs->of_node = codec_np;
140
141 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
142 if (!cpu_np) {
143 dev_err(&pdev->dev, "atmel,ssc-controller node missing\n");
144 ret = -EINVAL;
145 goto out_put_codec_np;
146 }
147 dai->cpus->of_node = cpu_np;
148 dai->platforms->of_node = cpu_np;
149
150 priv->ssc_id = of_alias_get_id(cpu_np, "ssc");
151
152 ret = atmel_ssc_set_audio(priv->ssc_id);
153 if (ret != 0) {
154 dev_err(&pdev->dev, "Failed to set SSC %d for audio: %d\n",
155 ret, priv->ssc_id);
156 goto out_put_cpu_np;
157 }
158
159 ret = devm_snd_soc_register_card(&pdev->dev, card);
160 if (ret) {
161 dev_err(&pdev->dev, "Platform device allocation failed\n");
162 goto out_put_audio;
163 }
164
165 dev_dbg(&pdev->dev, "%s ok\n", __func__);
166
167 goto out_put_cpu_np;
168
169 out_put_audio:
170 atmel_ssc_put_audio(priv->ssc_id);
171 out_put_cpu_np:
172 of_node_put(cpu_np);
173 out_put_codec_np:
174 of_node_put(codec_np);
175 out:
176 return ret;
177 }
178
sam9x5_wm8731_driver_remove(struct platform_device * pdev)179 static void sam9x5_wm8731_driver_remove(struct platform_device *pdev)
180 {
181 struct snd_soc_card *card = platform_get_drvdata(pdev);
182 struct sam9x5_drvdata *priv = card->drvdata;
183
184 atmel_ssc_put_audio(priv->ssc_id);
185 }
186
187 static const struct of_device_id sam9x5_wm8731_of_match[] = {
188 { .compatible = "atmel,sam9x5-wm8731-audio", },
189 {},
190 };
191 MODULE_DEVICE_TABLE(of, sam9x5_wm8731_of_match);
192
193 static struct platform_driver sam9x5_wm8731_driver = {
194 .driver = {
195 .name = DRV_NAME,
196 .of_match_table = of_match_ptr(sam9x5_wm8731_of_match),
197 },
198 .probe = sam9x5_wm8731_driver_probe,
199 .remove_new = sam9x5_wm8731_driver_remove,
200 };
201 module_platform_driver(sam9x5_wm8731_driver);
202
203 /* Module information */
204 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
205 MODULE_AUTHOR("Richard Genoud <richard.genoud@gmail.com>");
206 MODULE_DESCRIPTION("ALSA SoC machine driver for AT91SAM9x5 - WM8731");
207 MODULE_LICENSE("GPL");
208 MODULE_ALIAS("platform:" DRV_NAME);
209
