1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * ALSA Soc PCM3008 codec support
4 *
5 * Author: Hugo Villeneuve
6 * Copyright (C) 2008 Lyrtech inc
7 *
8 * Based on AC97 Soc codec, original copyright follow:
9 * Copyright 2005 Wolfson Microelectronics PLC.
10 *
11 * Generic PCM3008 support.
12 */
13
14#include <linux/init.h>
15#include <linux/kernel.h>
16#include <linux/device.h>
17#include <linux/gpio/consumer.h>
18#include <linux/slab.h>
19#include <linux/module.h>
20#include <sound/core.h>
21#include <sound/pcm.h>
22#include <sound/initval.h>
23#include <sound/soc.h>
24
25struct pcm3008 {
26 struct gpio_desc *dem0_pin;
27 struct gpio_desc *dem1_pin;
28 struct gpio_desc *pdad_pin;
29 struct gpio_desc *pdda_pin;
30};
31
32static int pcm3008_dac_ev(struct snd_soc_dapm_widget *w,
33 struct snd_kcontrol *kcontrol,
34 int event)
35{
36 struct snd_soc_component *component = snd_soc_dapm_to_component(dapm: w->dapm);
37 struct pcm3008 *pcm = component->dev->platform_data;
38
39 gpiod_set_value_cansleep(desc: pcm->pdda_pin,
40 SND_SOC_DAPM_EVENT_ON(event));
41
42 return 0;
43}
44
45static int pcm3008_adc_ev(struct snd_soc_dapm_widget *w,
46 struct snd_kcontrol *kcontrol,
47 int event)
48{
49 struct snd_soc_component *component = snd_soc_dapm_to_component(dapm: w->dapm);
50 struct pcm3008 *pcm = component->dev->platform_data;
51
52 gpiod_set_value_cansleep(desc: pcm->pdad_pin,
53 SND_SOC_DAPM_EVENT_ON(event));
54
55 return 0;
56}
57
58static const struct snd_soc_dapm_widget pcm3008_dapm_widgets[] = {
59SND_SOC_DAPM_INPUT("VINL"),
60SND_SOC_DAPM_INPUT("VINR"),
61
62SND_SOC_DAPM_DAC_E("DAC", NULL, SND_SOC_NOPM, 0, 0, pcm3008_dac_ev,
63 SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
64SND_SOC_DAPM_ADC_E("ADC", NULL, SND_SOC_NOPM, 0, 0, pcm3008_adc_ev,
65 SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
66
67SND_SOC_DAPM_OUTPUT("VOUTL"),
68SND_SOC_DAPM_OUTPUT("VOUTR"),
69};
70
71static const struct snd_soc_dapm_route pcm3008_dapm_routes[] = {
72 { "PCM3008 Capture", NULL, "ADC" },
73 { "ADC", NULL, "VINL" },
74 { "ADC", NULL, "VINR" },
75
76 { "DAC", NULL, "PCM3008 Playback" },
77 { "VOUTL", NULL, "DAC" },
78 { "VOUTR", NULL, "DAC" },
79};
80
81#define PCM3008_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
82 SNDRV_PCM_RATE_48000)
83
84static struct snd_soc_dai_driver pcm3008_dai = {
85 .name = "pcm3008-hifi",
86 .playback = {
87 .stream_name = "PCM3008 Playback",
88 .channels_min = 1,
89 .channels_max = 2,
90 .rates = PCM3008_RATES,
91 .formats = SNDRV_PCM_FMTBIT_S16_LE,
92 },
93 .capture = {
94 .stream_name = "PCM3008 Capture",
95 .channels_min = 1,
96 .channels_max = 2,
97 .rates = PCM3008_RATES,
98 .formats = SNDRV_PCM_FMTBIT_S16_LE,
99 },
100};
101
102static const struct snd_soc_component_driver soc_component_dev_pcm3008 = {
103 .dapm_widgets = pcm3008_dapm_widgets,
104 .num_dapm_widgets = ARRAY_SIZE(pcm3008_dapm_widgets),
105 .dapm_routes = pcm3008_dapm_routes,
106 .num_dapm_routes = ARRAY_SIZE(pcm3008_dapm_routes),
107 .idle_bias_on = 1,
108 .use_pmdown_time = 1,
109 .endianness = 1,
110};
111
112static int pcm3008_codec_probe(struct platform_device *pdev)
113{
114 struct device *dev = &pdev->dev;
115 struct pcm3008 *pcm;
116
117 pcm = devm_kzalloc(dev, size: sizeof(*pcm), GFP_KERNEL);
118 if (!pcm)
119 return -ENOMEM;
120 platform_set_drvdata(pdev, data: pcm);
121
122 /* DEM1 DEM0 DE-EMPHASIS_MODE
123 * Low Low De-emphasis 44.1 kHz ON
124 * Low High De-emphasis OFF
125 * High Low De-emphasis 48 kHz ON
126 * High High De-emphasis 32 kHz ON
127 */
128
129 /* Configure DEM0 GPIO (turning OFF DAC De-emphasis). */
130 pcm->dem0_pin = devm_gpiod_get(dev, con_id: "dem0", flags: GPIOD_OUT_HIGH);
131 if (IS_ERR(ptr: pcm->dem0_pin))
132 return PTR_ERR(ptr: pcm->dem0_pin);
133
134 /* Configure DEM1 GPIO (turning OFF DAC De-emphasis). */
135 pcm->dem1_pin = devm_gpiod_get(dev, con_id: "dem1", flags: GPIOD_OUT_LOW);
136 if (IS_ERR(ptr: pcm->dem1_pin))
137 return PTR_ERR(ptr: pcm->dem1_pin);
138
139 /* Configure PDAD GPIO. */
140 pcm->pdad_pin = devm_gpiod_get(dev, con_id: "pdad", flags: GPIOD_OUT_LOW);
141 if (IS_ERR(ptr: pcm->pdad_pin))
142 return PTR_ERR(ptr: pcm->pdad_pin);
143
144 /* Configure PDDA GPIO. */
145 pcm->pdda_pin = devm_gpiod_get(dev, con_id: "pdda", flags: GPIOD_OUT_LOW);
146 if (IS_ERR(ptr: pcm->pdda_pin))
147 return PTR_ERR(ptr: pcm->pdda_pin);
148
149 return devm_snd_soc_register_component(dev,
150 component_driver: &soc_component_dev_pcm3008, dai_drv: &pcm3008_dai, num_dai: 1);
151}
152
153MODULE_ALIAS("platform:pcm3008-codec");
154
155static struct platform_driver pcm3008_codec_driver = {
156 .probe = pcm3008_codec_probe,
157 .driver = {
158 .name = "pcm3008-codec",
159 },
160};
161
162module_platform_driver(pcm3008_codec_driver);
163
164MODULE_DESCRIPTION("Soc PCM3008 driver");
165MODULE_AUTHOR("Hugo Villeneuve");
166MODULE_LICENSE("GPL");
167

source code of linux/sound/soc/codecs/pcm3008.c