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Linux/sound/soc/atmel/sam9x5_wm8731.c

  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 
 39 struct sam9x5_drvdata {
 40         int ssc_id;
 41 };
 42 
 43 /*
 44  * Logic for a wm8731 as connected on a at91sam9x5ek based board.
 45  */
 46 static 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  */
 73 static 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 
 78 static 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 
169 out_put_audio:
170         atmel_ssc_put_audio(priv->ssc_id);
171 out:
172         return ret;
173 }
174 
175 static 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 
186 static const struct of_device_id sam9x5_wm8731_of_match[] = {
187         { .compatible = "atmel,sam9x5-wm8731-audio", },
188         {},
189 };
190 MODULE_DEVICE_TABLE(of, sam9x5_wm8731_of_match);
191 
192 static struct platform_driver sam9x5_wm8731_driver = {
193         .driver = {
194                 .name = DRV_NAME,
195                 .owner = THIS_MODULE,
196                 .of_match_table = of_match_ptr(sam9x5_wm8731_of_match),
197         },
198         .probe = sam9x5_wm8731_driver_probe,
199         .remove = 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 

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