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Linux/sound/soc/codecs/pcm3008.c

  1 /*
  2  * ALSA Soc PCM3008 codec support
  3  *
  4  * Author:      Hugo Villeneuve
  5  * Copyright (C) 2008 Lyrtech inc
  6  *
  7  * Based on AC97 Soc codec, original copyright follow:
  8  * Copyright 2005 Wolfson Microelectronics PLC.
  9  *
 10  *  This program is free software; you can redistribute  it and/or modify it
 11  *  under  the terms of  the GNU General  Public License as published by the
 12  *  Free Software Foundation;  either version 2 of the  License, or (at your
 13  *  option) any later version.
 14  *
 15  * Generic PCM3008 support.
 16  */
 17 
 18 #include <linux/init.h>
 19 #include <linux/kernel.h>
 20 #include <linux/device.h>
 21 #include <linux/gpio.h>
 22 #include <linux/slab.h>
 23 #include <linux/module.h>
 24 #include <sound/core.h>
 25 #include <sound/pcm.h>
 26 #include <sound/initval.h>
 27 #include <sound/soc.h>
 28 
 29 #include "pcm3008.h"
 30 
 31 static int pcm3008_dac_ev(struct snd_soc_dapm_widget *w,
 32                           struct snd_kcontrol *kcontrol,
 33                           int event)
 34 {
 35         struct snd_soc_codec *codec = w->codec;
 36         struct pcm3008_setup_data *setup = codec->dev->platform_data;
 37 
 38         gpio_set_value_cansleep(setup->pdda_pin,
 39                                 SND_SOC_DAPM_EVENT_ON(event));
 40 
 41         return 0;
 42 }
 43 
 44 static int pcm3008_adc_ev(struct snd_soc_dapm_widget *w,
 45                           struct snd_kcontrol *kcontrol,
 46                           int event)
 47 {
 48         struct snd_soc_codec *codec = w->codec;
 49         struct pcm3008_setup_data *setup = codec->dev->platform_data;
 50 
 51         gpio_set_value_cansleep(setup->pdad_pin,
 52                                 SND_SOC_DAPM_EVENT_ON(event));
 53 
 54         return 0;
 55 }
 56 
 57 static const struct snd_soc_dapm_widget pcm3008_dapm_widgets[] = {
 58 SND_SOC_DAPM_INPUT("VINL"),
 59 SND_SOC_DAPM_INPUT("VINR"),
 60 
 61 SND_SOC_DAPM_DAC_E("DAC", NULL, SND_SOC_NOPM, 0, 0, pcm3008_dac_ev,
 62                    SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
 63 SND_SOC_DAPM_ADC_E("ADC", NULL, SND_SOC_NOPM, 0, 0, pcm3008_adc_ev,
 64                    SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
 65 
 66 SND_SOC_DAPM_OUTPUT("VOUTL"),
 67 SND_SOC_DAPM_OUTPUT("VOUTR"),
 68 };
 69 
 70 static const struct snd_soc_dapm_route pcm3008_dapm_routes[] = {
 71         { "PCM3008 Capture", NULL, "ADC" },
 72         { "ADC", NULL, "VINL" },
 73         { "ADC", NULL, "VINR" },
 74 
 75         { "DAC", NULL, "PCM3008 Playback" },
 76         { "VOUTL", NULL, "DAC" },
 77         { "VOUTR", NULL, "DAC" },
 78 };
 79 
 80 #define PCM3008_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |    \
 81                        SNDRV_PCM_RATE_48000)
 82 
 83 static struct snd_soc_dai_driver pcm3008_dai = {
 84         .name = "pcm3008-hifi",
 85         .playback = {
 86                 .stream_name = "PCM3008 Playback",
 87                 .channels_min = 1,
 88                 .channels_max = 2,
 89                 .rates = PCM3008_RATES,
 90                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 91         },
 92         .capture = {
 93                 .stream_name = "PCM3008 Capture",
 94                 .channels_min = 1,
 95                 .channels_max = 2,
 96                 .rates = PCM3008_RATES,
 97                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 98         },
 99 };
100 
101 static struct snd_soc_codec_driver soc_codec_dev_pcm3008 = {
102         .dapm_widgets = pcm3008_dapm_widgets,
103         .num_dapm_widgets = ARRAY_SIZE(pcm3008_dapm_widgets),
104         .dapm_routes = pcm3008_dapm_routes,
105         .num_dapm_routes = ARRAY_SIZE(pcm3008_dapm_routes),
106 };
107 
108 static int pcm3008_codec_probe(struct platform_device *pdev)
109 {
110         struct pcm3008_setup_data *setup = pdev->dev.platform_data;
111         int ret;
112 
113         if (!setup)
114                 return -EINVAL;
115 
116         /* DEM1  DEM0  DE-EMPHASIS_MODE
117          * Low   Low   De-emphasis 44.1 kHz ON
118          * Low   High  De-emphasis OFF
119          * High  Low   De-emphasis 48 kHz ON
120          * High  High  De-emphasis 32 kHz ON
121          */
122 
123         /* Configure DEM0 GPIO (turning OFF DAC De-emphasis). */
124         ret = devm_gpio_request_one(&pdev->dev, setup->dem0_pin,
125                                     GPIOF_OUT_INIT_HIGH, "codec_dem0");
126         if (ret != 0)
127                 return ret;
128 
129         /* Configure DEM1 GPIO (turning OFF DAC De-emphasis). */
130         ret = devm_gpio_request_one(&pdev->dev, setup->dem1_pin,
131                                     GPIOF_OUT_INIT_LOW, "codec_dem1");
132         if (ret != 0)
133                 return ret;
134 
135         /* Configure PDAD GPIO. */
136         ret = devm_gpio_request_one(&pdev->dev, setup->pdad_pin,
137                                     GPIOF_OUT_INIT_LOW, "codec_pdad");
138         if (ret != 0)
139                 return ret;
140 
141         /* Configure PDDA GPIO. */
142         ret = devm_gpio_request_one(&pdev->dev, setup->pdda_pin,
143                                     GPIOF_OUT_INIT_LOW, "codec_pdda");
144         if (ret != 0)
145                 return ret;
146 
147         return snd_soc_register_codec(&pdev->dev,
148                         &soc_codec_dev_pcm3008, &pcm3008_dai, 1);
149 }
150 
151 static int pcm3008_codec_remove(struct platform_device *pdev)
152 {
153         snd_soc_unregister_codec(&pdev->dev);
154 
155         return 0;
156 }
157 
158 MODULE_ALIAS("platform:pcm3008-codec");
159 
160 static struct platform_driver pcm3008_codec_driver = {
161         .probe          = pcm3008_codec_probe,
162         .remove         = pcm3008_codec_remove,
163         .driver         = {
164                 .name   = "pcm3008-codec",
165                 .owner  = THIS_MODULE,
166         },
167 };
168 
169 module_platform_driver(pcm3008_codec_driver);
170 
171 MODULE_DESCRIPTION("Soc PCM3008 driver");
172 MODULE_AUTHOR("Hugo Villeneuve");
173 MODULE_LICENSE("GPL");
174 

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