1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * sam9g20_wm8731 -- SoC audio for AT91SAM9G20-based
4 * ATMEL AT91SAM9G20ek board.
6 * Copyright (C) 2005 SAN People
7 * Copyright (C) 2008 Atmel
9 * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
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.
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>
28 #include <linux/atmel-ssc.h>
30 #include <sound/core.h>
31 #include <sound/pcm.h>
32 #include <sound/pcm_params.h>
33 #include <sound/soc.h>
35 #include "../codecs/wm8731.h"
36 #include "atmel-pcm.h"
37 #include "atmel_ssc_dai.h"
39 #define MCLK_RATE 12000000
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
46 #undef ENABLE_MIC_INPUT
48 static 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),
53 static const struct snd_soc_dapm_route intercon[] = {
55 /* speaker connected to LHPOUT/RHPOUT */
56 {"Ext Spk", NULL, "LHPOUT"},
57 {"Ext Spk", NULL, "RHPOUT"},
59 /* mic is connected to Mic Jack, with WM8731 Mic Bias */
60 {"MICIN", NULL, "Mic Bias"},
61 {"Mic Bias", NULL, "Int Mic"},
65 * Logic for a wm8731 as connected on a at91sam9g20ek board.
67 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
69 struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
70 struct device *dev = rtd->dev;
73 dev_dbg(dev, "%s called\n", __func__);
75 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
76 MCLK_RATE, SND_SOC_CLOCK_IN);
78 dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
82 #ifndef ENABLE_MIC_INPUT
83 snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
89 SND_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")));
94 static struct snd_soc_dai_link at91sam9g20ek_dai = {
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,
103 SND_SOC_DAILINK_REG(pcm),
106 static struct snd_soc_card snd_soc_at91sam9g20ek = {
107 .name = "AT91SAMG20-EK",
108 .owner = THIS_MODULE,
109 .dai_link = &at91sam9g20ek_dai,
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,
119 static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
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;
130 ret = atmel_ssc_set_audio(0);
132 dev_err(&pdev->dev, "ssc channel is not valid: %d\n", ret);
136 card->dev = &pdev->dev;
138 /* Parse device node info */
139 ret = snd_soc_of_parse_card_name(card, "atmel,model");
143 ret = snd_soc_of_parse_audio_routing(card,
144 "atmel,audio-routing");
148 /* Parse codec info */
149 at91sam9g20ek_dai.codecs->name = NULL;
150 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
152 dev_err(&pdev->dev, "codec info missing\n");
156 at91sam9g20ek_dai.codecs->of_node = codec_np;
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);
163 dev_err(&pdev->dev, "dai and pcm info missing\n");
164 of_node_put(codec_np);
168 at91sam9g20ek_dai.cpus->of_node = cpu_np;
169 at91sam9g20ek_dai.platforms->of_node = cpu_np;
171 of_node_put(codec_np);
174 ret = snd_soc_register_card(card);
176 dev_err_probe(&pdev->dev, ret,
177 "snd_soc_register_card() failed\n");
184 atmel_ssc_put_audio(0);
188 static void at91sam9g20ek_audio_remove(struct platform_device *pdev)
190 struct snd_soc_card *card = platform_get_drvdata(pdev);
192 snd_soc_unregister_card(card);
193 atmel_ssc_put_audio(0);
197 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
198 { .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
201 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
204 static struct platform_driver at91sam9g20ek_audio_driver = {
206 .name = "at91sam9g20ek-audio",
207 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
209 .probe = at91sam9g20ek_audio_probe,
210 .remove_new = at91sam9g20ek_audio_remove,
213 module_platform_driver(at91sam9g20ek_audio_driver);
215 /* Module information */
216 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
217 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
218 MODULE_ALIAS("platform:at91sam9g20ek-audio");
219 MODULE_LICENSE("GPL");