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.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 
25 #include "pcm3008.h"
26 
pcm3008_dac_ev(struct snd_soc_dapm_widget * w,struct snd_kcontrol * kcontrol,int event)27 static int pcm3008_dac_ev(struct snd_soc_dapm_widget *w,
28 			  struct snd_kcontrol *kcontrol,
29 			  int event)
30 {
31 	struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
32 	struct pcm3008_setup_data *setup = component->dev->platform_data;
33 
34 	gpio_set_value_cansleep(setup->pdda_pin,
35 				SND_SOC_DAPM_EVENT_ON(event));
36 
37 	return 0;
38 }
39 
pcm3008_adc_ev(struct snd_soc_dapm_widget * w,struct snd_kcontrol * kcontrol,int event)40 static int pcm3008_adc_ev(struct snd_soc_dapm_widget *w,
41 			  struct snd_kcontrol *kcontrol,
42 			  int event)
43 {
44 	struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
45 	struct pcm3008_setup_data *setup = component->dev->platform_data;
46 
47 	gpio_set_value_cansleep(setup->pdad_pin,
48 				SND_SOC_DAPM_EVENT_ON(event));
49 
50 	return 0;
51 }
52 
53 static const struct snd_soc_dapm_widget pcm3008_dapm_widgets[] = {
54 SND_SOC_DAPM_INPUT("VINL"),
55 SND_SOC_DAPM_INPUT("VINR"),
56 
57 SND_SOC_DAPM_DAC_E("DAC", NULL, SND_SOC_NOPM, 0, 0, pcm3008_dac_ev,
58 		   SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
59 SND_SOC_DAPM_ADC_E("ADC", NULL, SND_SOC_NOPM, 0, 0, pcm3008_adc_ev,
60 		   SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
61 
62 SND_SOC_DAPM_OUTPUT("VOUTL"),
63 SND_SOC_DAPM_OUTPUT("VOUTR"),
64 };
65 
66 static const struct snd_soc_dapm_route pcm3008_dapm_routes[] = {
67 	{ "PCM3008 Capture", NULL, "ADC" },
68 	{ "ADC", NULL, "VINL" },
69 	{ "ADC", NULL, "VINR" },
70 
71 	{ "DAC", NULL, "PCM3008 Playback" },
72 	{ "VOUTL", NULL, "DAC" },
73 	{ "VOUTR", NULL, "DAC" },
74 };
75 
76 #define PCM3008_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |	\
77 		       SNDRV_PCM_RATE_48000)
78 
79 static struct snd_soc_dai_driver pcm3008_dai = {
80 	.name = "pcm3008-hifi",
81 	.playback = {
82 		.stream_name = "PCM3008 Playback",
83 		.channels_min = 1,
84 		.channels_max = 2,
85 		.rates = PCM3008_RATES,
86 		.formats = SNDRV_PCM_FMTBIT_S16_LE,
87 	},
88 	.capture = {
89 		.stream_name = "PCM3008 Capture",
90 		.channels_min = 1,
91 		.channels_max = 2,
92 		.rates = PCM3008_RATES,
93 		.formats = SNDRV_PCM_FMTBIT_S16_LE,
94 	},
95 };
96 
97 static const struct snd_soc_component_driver soc_component_dev_pcm3008 = {
98 	.dapm_widgets		= pcm3008_dapm_widgets,
99 	.num_dapm_widgets	= ARRAY_SIZE(pcm3008_dapm_widgets),
100 	.dapm_routes		= pcm3008_dapm_routes,
101 	.num_dapm_routes	= ARRAY_SIZE(pcm3008_dapm_routes),
102 	.idle_bias_on		= 1,
103 	.use_pmdown_time	= 1,
104 	.endianness		= 1,
105 };
106 
pcm3008_codec_probe(struct platform_device * pdev)107 static int pcm3008_codec_probe(struct platform_device *pdev)
108 {
109 	struct pcm3008_setup_data *setup = pdev->dev.platform_data;
110 	int ret;
111 
112 	if (!setup)
113 		return -EINVAL;
114 
115 	/* DEM1  DEM0  DE-EMPHASIS_MODE
116 	 * Low   Low   De-emphasis 44.1 kHz ON
117 	 * Low   High  De-emphasis OFF
118 	 * High  Low   De-emphasis 48 kHz ON
119 	 * High  High  De-emphasis 32 kHz ON
120 	 */
121 
122 	/* Configure DEM0 GPIO (turning OFF DAC De-emphasis). */
123 	ret = devm_gpio_request_one(&pdev->dev, setup->dem0_pin,
124 				    GPIOF_OUT_INIT_HIGH, "codec_dem0");
125 	if (ret != 0)
126 		return ret;
127 
128 	/* Configure DEM1 GPIO (turning OFF DAC De-emphasis). */
129 	ret = devm_gpio_request_one(&pdev->dev, setup->dem1_pin,
130 				    GPIOF_OUT_INIT_LOW, "codec_dem1");
131 	if (ret != 0)
132 		return ret;
133 
134 	/* Configure PDAD GPIO. */
135 	ret = devm_gpio_request_one(&pdev->dev, setup->pdad_pin,
136 				    GPIOF_OUT_INIT_LOW, "codec_pdad");
137 	if (ret != 0)
138 		return ret;
139 
140 	/* Configure PDDA GPIO. */
141 	ret = devm_gpio_request_one(&pdev->dev, setup->pdda_pin,
142 				    GPIOF_OUT_INIT_LOW, "codec_pdda");
143 	if (ret != 0)
144 		return ret;
145 
146 	return devm_snd_soc_register_component(&pdev->dev,
147 			&soc_component_dev_pcm3008, &pcm3008_dai, 1);
148 }
149 
150 MODULE_ALIAS("platform:pcm3008-codec");
151 
152 static struct platform_driver pcm3008_codec_driver = {
153 	.probe		= pcm3008_codec_probe,
154 	.driver		= {
155 		.name	= "pcm3008-codec",
156 	},
157 };
158 
159 module_platform_driver(pcm3008_codec_driver);
160 
161 MODULE_DESCRIPTION("Soc PCM3008 driver");
162 MODULE_AUTHOR("Hugo Villeneuve");
163 MODULE_LICENSE("GPL");
164