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Linux/sound/soc/codecs/dmic.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * dmic.c  --  SoC audio for Generic Digital MICs
  4  *
  5  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
  6  */
  7 
  8 #include <linux/delay.h>
  9 #include <linux/gpio.h>
 10 #include <linux/gpio/consumer.h>
 11 #include <linux/platform_device.h>
 12 #include <linux/slab.h>
 13 #include <linux/module.h>
 14 #include <sound/core.h>
 15 #include <sound/pcm.h>
 16 #include <sound/soc.h>
 17 #include <sound/soc-dapm.h>
 18 
 19 #define MAX_MODESWITCH_DELAY 70
 20 static int modeswitch_delay;
 21 module_param(modeswitch_delay, uint, 0644);
 22 
 23 static int wakeup_delay;
 24 module_param(wakeup_delay, uint, 0644);
 25 
 26 struct dmic {
 27         struct gpio_desc *gpio_en;
 28         int wakeup_delay;
 29         /* Delay after DMIC mode switch */
 30         int modeswitch_delay;
 31 };
 32 
 33 static int dmic_daiops_trigger(struct snd_pcm_substream *substream,
 34                                int cmd, struct snd_soc_dai *dai)
 35 {
 36         struct snd_soc_component *component = dai->component;
 37         struct dmic *dmic = snd_soc_component_get_drvdata(component);
 38 
 39         switch (cmd) {
 40         case SNDRV_PCM_TRIGGER_STOP:
 41                 if (dmic->modeswitch_delay)
 42                         mdelay(dmic->modeswitch_delay);
 43 
 44                 break;
 45         }
 46 
 47         return 0;
 48 }
 49 
 50 static const struct snd_soc_dai_ops dmic_dai_ops = {
 51         .trigger        = dmic_daiops_trigger,
 52 };
 53 
 54 static int dmic_aif_event(struct snd_soc_dapm_widget *w,
 55                           struct snd_kcontrol *kcontrol, int event) {
 56         struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
 57         struct dmic *dmic = snd_soc_component_get_drvdata(component);
 58 
 59         switch (event) {
 60         case SND_SOC_DAPM_POST_PMU:
 61                 if (dmic->gpio_en)
 62                         gpiod_set_value(dmic->gpio_en, 1);
 63 
 64                 if (dmic->wakeup_delay)
 65                         msleep(dmic->wakeup_delay);
 66                 break;
 67         case SND_SOC_DAPM_POST_PMD:
 68                 if (dmic->gpio_en)
 69                         gpiod_set_value(dmic->gpio_en, 0);
 70                 break;
 71         }
 72 
 73         return 0;
 74 }
 75 
 76 static struct snd_soc_dai_driver dmic_dai = {
 77         .name = "dmic-hifi",
 78         .capture = {
 79                 .stream_name = "Capture",
 80                 .channels_min = 1,
 81                 .channels_max = 8,
 82                 .rates = SNDRV_PCM_RATE_CONTINUOUS,
 83                 .formats = SNDRV_PCM_FMTBIT_S32_LE
 84                         | SNDRV_PCM_FMTBIT_S24_LE
 85                         | SNDRV_PCM_FMTBIT_S16_LE,
 86         },
 87         .ops    = &dmic_dai_ops,
 88 };
 89 
 90 static int dmic_component_probe(struct snd_soc_component *component)
 91 {
 92         struct dmic *dmic;
 93 
 94         dmic = devm_kzalloc(component->dev, sizeof(*dmic), GFP_KERNEL);
 95         if (!dmic)
 96                 return -ENOMEM;
 97 
 98         dmic->gpio_en = devm_gpiod_get_optional(component->dev,
 99                                                 "dmicen", GPIOD_OUT_LOW);
100         if (IS_ERR(dmic->gpio_en))
101                 return PTR_ERR(dmic->gpio_en);
102 
103         device_property_read_u32(component->dev, "wakeup-delay-ms",
104                                  &dmic->wakeup_delay);
105         device_property_read_u32(component->dev, "modeswitch-delay-ms",
106                                  &dmic->modeswitch_delay);
107         if (wakeup_delay)
108                 dmic->wakeup_delay  = wakeup_delay;
109         if (modeswitch_delay)
110                 dmic->modeswitch_delay  = modeswitch_delay;
111 
112         if (dmic->modeswitch_delay > MAX_MODESWITCH_DELAY)
113                 dmic->modeswitch_delay = MAX_MODESWITCH_DELAY;
114 
115         snd_soc_component_set_drvdata(component, dmic);
116 
117         return 0;
118 }
119 
120 static const struct snd_soc_dapm_widget dmic_dapm_widgets[] = {
121         SND_SOC_DAPM_AIF_OUT_E("DMIC AIF", "Capture", 0,
122                                SND_SOC_NOPM, 0, 0, dmic_aif_event,
123                                SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
124         SND_SOC_DAPM_INPUT("DMic"),
125 };
126 
127 static const struct snd_soc_dapm_route intercon[] = {
128         {"DMIC AIF", NULL, "DMic"},
129 };
130 
131 static const struct snd_soc_component_driver soc_dmic = {
132         .probe                  = dmic_component_probe,
133         .dapm_widgets           = dmic_dapm_widgets,
134         .num_dapm_widgets       = ARRAY_SIZE(dmic_dapm_widgets),
135         .dapm_routes            = intercon,
136         .num_dapm_routes        = ARRAY_SIZE(intercon),
137         .idle_bias_on           = 1,
138         .use_pmdown_time        = 1,
139         .endianness             = 1,
140         .non_legacy_dai_naming  = 1,
141 };
142 
143 static int dmic_dev_probe(struct platform_device *pdev)
144 {
145         int err;
146         u32 chans;
147         struct snd_soc_dai_driver *dai_drv = &dmic_dai;
148 
149         if (pdev->dev.of_node) {
150                 err = of_property_read_u32(pdev->dev.of_node, "num-channels", &chans);
151                 if (err && (err != -EINVAL))
152                         return err;
153 
154                 if (!err) {
155                         if (chans < 1 || chans > 8)
156                                 return -EINVAL;
157 
158                         dai_drv = devm_kzalloc(&pdev->dev, sizeof(*dai_drv), GFP_KERNEL);
159                         if (!dai_drv)
160                                 return -ENOMEM;
161 
162                         memcpy(dai_drv, &dmic_dai, sizeof(*dai_drv));
163                         dai_drv->capture.channels_max = chans;
164                 }
165         }
166 
167         return devm_snd_soc_register_component(&pdev->dev,
168                         &soc_dmic, dai_drv, 1);
169 }
170 
171 MODULE_ALIAS("platform:dmic-codec");
172 
173 static const struct of_device_id dmic_dev_match[] = {
174         {.compatible = "dmic-codec"},
175         {}
176 };
177 MODULE_DEVICE_TABLE(of, dmic_dev_match);
178 
179 static struct platform_driver dmic_driver = {
180         .driver = {
181                 .name = "dmic-codec",
182                 .of_match_table = dmic_dev_match,
183         },
184         .probe = dmic_dev_probe,
185 };
186 
187 module_platform_driver(dmic_driver);
188 
189 MODULE_DESCRIPTION("Generic DMIC driver");
190 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
191 MODULE_LICENSE("GPL");
192 

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