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Linux/sound/soc/atmel/atmel_wm8904.c

  1 /*
  2  * atmel_wm8904 - Atmel ASoC driver for boards with WM8904 codec.
  3  *
  4  * Copyright (C) 2012 Atmel
  5  *
  6  * Author: Bo Shen <voice.shen@atmel.com>
  7  *
  8  * GPLv2 or later
  9  */
 10 
 11 #include <linux/clk.h>
 12 #include <linux/module.h>
 13 #include <linux/of.h>
 14 #include <linux/of_device.h>
 15 
 16 #include <sound/soc.h>
 17 
 18 #include "../codecs/wm8904.h"
 19 #include "atmel_ssc_dai.h"
 20 
 21 static const struct snd_soc_dapm_widget atmel_asoc_wm8904_dapm_widgets[] = {
 22         SND_SOC_DAPM_HP("Headphone Jack", NULL),
 23         SND_SOC_DAPM_MIC("Mic", NULL),
 24         SND_SOC_DAPM_LINE("Line In Jack", NULL),
 25 };
 26 
 27 static int atmel_asoc_wm8904_hw_params(struct snd_pcm_substream *substream,
 28                 struct snd_pcm_hw_params *params)
 29 {
 30         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 31         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 32         int ret;
 33 
 34         ret = snd_soc_dai_set_pll(codec_dai, WM8904_FLL_MCLK, WM8904_FLL_MCLK,
 35                 32768, params_rate(params) * 256);
 36         if (ret < 0) {
 37                 pr_err("%s - failed to set wm8904 codec PLL.", __func__);
 38                 return ret;
 39         }
 40 
 41         /*
 42          * As here wm8904 use FLL output as its system clock
 43          * so calling set_sysclk won't care freq parameter
 44          * then we pass 0
 45          */
 46         ret = snd_soc_dai_set_sysclk(codec_dai, WM8904_CLK_FLL,
 47                         0, SND_SOC_CLOCK_IN);
 48         if (ret < 0) {
 49                 pr_err("%s -failed to set wm8904 SYSCLK\n", __func__);
 50                 return ret;
 51         }
 52 
 53         return 0;
 54 }
 55 
 56 static struct snd_soc_ops atmel_asoc_wm8904_ops = {
 57         .hw_params = atmel_asoc_wm8904_hw_params,
 58 };
 59 
 60 static struct snd_soc_dai_link atmel_asoc_wm8904_dailink = {
 61         .name = "WM8904",
 62         .stream_name = "WM8904 PCM",
 63         .codec_dai_name = "wm8904-hifi",
 64         .dai_fmt = SND_SOC_DAIFMT_I2S
 65                 | SND_SOC_DAIFMT_NB_NF
 66                 | SND_SOC_DAIFMT_CBM_CFM,
 67         .ops = &atmel_asoc_wm8904_ops,
 68 };
 69 
 70 static struct snd_soc_card atmel_asoc_wm8904_card = {
 71         .name = "atmel_asoc_wm8904",
 72         .owner = THIS_MODULE,
 73         .dai_link = &atmel_asoc_wm8904_dailink,
 74         .num_links = 1,
 75         .dapm_widgets = atmel_asoc_wm8904_dapm_widgets,
 76         .num_dapm_widgets = ARRAY_SIZE(atmel_asoc_wm8904_dapm_widgets),
 77         .fully_routed = true,
 78 };
 79 
 80 static int atmel_asoc_wm8904_dt_init(struct platform_device *pdev)
 81 {
 82         struct device_node *np = pdev->dev.of_node;
 83         struct device_node *codec_np, *cpu_np;
 84         struct snd_soc_card *card = &atmel_asoc_wm8904_card;
 85         struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
 86         int ret;
 87 
 88         if (!np) {
 89                 dev_err(&pdev->dev, "only device tree supported\n");
 90                 return -EINVAL;
 91         }
 92 
 93         ret = snd_soc_of_parse_card_name(card, "atmel,model");
 94         if (ret) {
 95                 dev_err(&pdev->dev, "failed to parse card name\n");
 96                 return ret;
 97         }
 98 
 99         ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing");
100         if (ret) {
101                 dev_err(&pdev->dev, "failed to parse audio routing\n");
102                 return ret;
103         }
104 
105         cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
106         if (!cpu_np) {
107                 dev_err(&pdev->dev, "failed to get dai and pcm info\n");
108                 ret = -EINVAL;
109                 return ret;
110         }
111         dailink->cpu_of_node = cpu_np;
112         dailink->platform_of_node = cpu_np;
113         of_node_put(cpu_np);
114 
115         codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
116         if (!codec_np) {
117                 dev_err(&pdev->dev, "failed to get codec info\n");
118                 ret = -EINVAL;
119                 return ret;
120         }
121         dailink->codec_of_node = codec_np;
122         of_node_put(codec_np);
123 
124         return 0;
125 }
126 
127 static int atmel_asoc_wm8904_probe(struct platform_device *pdev)
128 {
129         struct snd_soc_card *card = &atmel_asoc_wm8904_card;
130         struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
131         int id, ret;
132 
133         card->dev = &pdev->dev;
134         ret = atmel_asoc_wm8904_dt_init(pdev);
135         if (ret) {
136                 dev_err(&pdev->dev, "failed to init dt info\n");
137                 return ret;
138         }
139 
140         id = of_alias_get_id((struct device_node *)dailink->cpu_of_node, "ssc");
141         ret = atmel_ssc_set_audio(id);
142         if (ret != 0) {
143                 dev_err(&pdev->dev, "failed to set SSC %d for audio\n", id);
144                 return ret;
145         }
146 
147         ret = snd_soc_register_card(card);
148         if (ret) {
149                 dev_err(&pdev->dev, "snd_soc_register_card failed\n");
150                 goto err_set_audio;
151         }
152 
153         return 0;
154 
155 err_set_audio:
156         atmel_ssc_put_audio(id);
157         return ret;
158 }
159 
160 static int atmel_asoc_wm8904_remove(struct platform_device *pdev)
161 {
162         struct snd_soc_card *card = platform_get_drvdata(pdev);
163         struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
164         int id;
165 
166         id = of_alias_get_id((struct device_node *)dailink->cpu_of_node, "ssc");
167 
168         snd_soc_unregister_card(card);
169         atmel_ssc_put_audio(id);
170 
171         return 0;
172 }
173 
174 #ifdef CONFIG_OF
175 static const struct of_device_id atmel_asoc_wm8904_dt_ids[] = {
176         { .compatible = "atmel,asoc-wm8904", },
177         { }
178 };
179 #endif
180 
181 static struct platform_driver atmel_asoc_wm8904_driver = {
182         .driver = {
183                 .name = "atmel-wm8904-audio",
184                 .owner = THIS_MODULE,
185                 .of_match_table = of_match_ptr(atmel_asoc_wm8904_dt_ids),
186         },
187         .probe = atmel_asoc_wm8904_probe,
188         .remove = atmel_asoc_wm8904_remove,
189 };
190 
191 module_platform_driver(atmel_asoc_wm8904_driver);
192 
193 /* Module information */
194 MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
195 MODULE_DESCRIPTION("ALSA SoC machine driver for Atmel EK with WM8904 codec");
196 MODULE_LICENSE("GPL");
197 

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