1 /* 2 * dmic.c -- SoC audio for Generic Digital MICs 3 * 4 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * version 2 as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 18 * 02110-1301 USA 19 * 20 */ 21 22 #include <linux/delay.h> 23 #include <linux/gpio.h> 24 #include <linux/gpio/consumer.h> 25 #include <linux/platform_device.h> 26 #include <linux/slab.h> 27 #include <linux/module.h> 28 #include <sound/core.h> 29 #include <sound/pcm.h> 30 #include <sound/soc.h> 31 #include <sound/soc-dapm.h> 32 33 #define MAX_MODESWITCH_DELAY 70 34 static int modeswitch_delay; 35 module_param(modeswitch_delay, uint, 0644); 36 37 static int wakeup_delay; 38 module_param(wakeup_delay, uint, 0644); 39 40 struct dmic { 41 struct gpio_desc *gpio_en; 42 int wakeup_delay; 43 /* Delay after DMIC mode switch */ 44 int modeswitch_delay; 45 }; 46 47 int dmic_daiops_trigger(struct snd_pcm_substream *substream, 48 int cmd, struct snd_soc_dai *dai) 49 { 50 struct snd_soc_component *component = dai->component; 51 struct dmic *dmic = snd_soc_component_get_drvdata(component); 52 53 switch (cmd) { 54 case SNDRV_PCM_TRIGGER_STOP: 55 if (dmic->modeswitch_delay) 56 mdelay(dmic->modeswitch_delay); 57 58 break; 59 } 60 61 return 0; 62 } 63 64 static const struct snd_soc_dai_ops dmic_dai_ops = { 65 .trigger = dmic_daiops_trigger, 66 }; 67 68 static int dmic_aif_event(struct snd_soc_dapm_widget *w, 69 struct snd_kcontrol *kcontrol, int event) { 70 struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm); 71 struct dmic *dmic = snd_soc_component_get_drvdata(component); 72 73 switch (event) { 74 case SND_SOC_DAPM_POST_PMU: 75 if (dmic->gpio_en) 76 gpiod_set_value(dmic->gpio_en, 1); 77 78 if (dmic->wakeup_delay) 79 msleep(dmic->wakeup_delay); 80 break; 81 case SND_SOC_DAPM_POST_PMD: 82 if (dmic->gpio_en) 83 gpiod_set_value(dmic->gpio_en, 0); 84 break; 85 } 86 87 return 0; 88 } 89 90 static struct snd_soc_dai_driver dmic_dai = { 91 .name = "dmic-hifi", 92 .capture = { 93 .stream_name = "Capture", 94 .channels_min = 1, 95 .channels_max = 8, 96 .rates = SNDRV_PCM_RATE_CONTINUOUS, 97 .formats = SNDRV_PCM_FMTBIT_S32_LE 98 | SNDRV_PCM_FMTBIT_S24_LE 99 | SNDRV_PCM_FMTBIT_S16_LE, 100 }, 101 .ops = &dmic_dai_ops, 102 }; 103 104 static int dmic_component_probe(struct snd_soc_component *component) 105 { 106 struct dmic *dmic; 107 108 dmic = devm_kzalloc(component->dev, sizeof(*dmic), GFP_KERNEL); 109 if (!dmic) 110 return -ENOMEM; 111 112 dmic->gpio_en = devm_gpiod_get_optional(component->dev, 113 "dmicen", GPIOD_OUT_LOW); 114 if (IS_ERR(dmic->gpio_en)) 115 return PTR_ERR(dmic->gpio_en); 116 117 device_property_read_u32(component->dev, "wakeup-delay-ms", 118 &dmic->wakeup_delay); 119 device_property_read_u32(component->dev, "modeswitch-delay-ms", 120 &dmic->modeswitch_delay); 121 if (wakeup_delay) 122 dmic->wakeup_delay = wakeup_delay; 123 if (modeswitch_delay) 124 dmic->modeswitch_delay = modeswitch_delay; 125 126 if (dmic->modeswitch_delay > MAX_MODESWITCH_DELAY) 127 dmic->modeswitch_delay = MAX_MODESWITCH_DELAY; 128 129 snd_soc_component_set_drvdata(component, dmic); 130 131 return 0; 132 } 133 134 static const struct snd_soc_dapm_widget dmic_dapm_widgets[] = { 135 SND_SOC_DAPM_AIF_OUT_E("DMIC AIF", "Capture", 0, 136 SND_SOC_NOPM, 0, 0, dmic_aif_event, 137 SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD), 138 SND_SOC_DAPM_INPUT("DMic"), 139 }; 140 141 static const struct snd_soc_dapm_route intercon[] = { 142 {"DMIC AIF", NULL, "DMic"}, 143 }; 144 145 static const struct snd_soc_component_driver soc_dmic = { 146 .probe = dmic_component_probe, 147 .dapm_widgets = dmic_dapm_widgets, 148 .num_dapm_widgets = ARRAY_SIZE(dmic_dapm_widgets), 149 .dapm_routes = intercon, 150 .num_dapm_routes = ARRAY_SIZE(intercon), 151 .idle_bias_on = 1, 152 .use_pmdown_time = 1, 153 .endianness = 1, 154 .non_legacy_dai_naming = 1, 155 }; 156 157 static int dmic_dev_probe(struct platform_device *pdev) 158 { 159 int err; 160 u32 chans; 161 struct snd_soc_dai_driver *dai_drv = &dmic_dai; 162 163 if (pdev->dev.of_node) { 164 err = of_property_read_u32(pdev->dev.of_node, "num-channels", &chans); 165 if (err && (err != -EINVAL)) 166 return err; 167 168 if (!err) { 169 if (chans < 1 || chans > 8) 170 return -EINVAL; 171 172 dai_drv = devm_kzalloc(&pdev->dev, sizeof(*dai_drv), GFP_KERNEL); 173 if (!dai_drv) 174 return -ENOMEM; 175 176 memcpy(dai_drv, &dmic_dai, sizeof(*dai_drv)); 177 dai_drv->capture.channels_max = chans; 178 } 179 } 180 181 return devm_snd_soc_register_component(&pdev->dev, 182 &soc_dmic, dai_drv, 1); 183 } 184 185 MODULE_ALIAS("platform:dmic-codec"); 186 187 static const struct of_device_id dmic_dev_match[] = { 188 {.compatible = "dmic-codec"}, 189 {} 190 }; 191 MODULE_DEVICE_TABLE(of, dmic_dev_match); 192 193 static struct platform_driver dmic_driver = { 194 .driver = { 195 .name = "dmic-codec", 196 .of_match_table = dmic_dev_match, 197 }, 198 .probe = dmic_dev_probe, 199 }; 200 201 module_platform_driver(dmic_driver); 202 203 MODULE_DESCRIPTION("Generic DMIC driver"); 204 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); 205 MODULE_LICENSE("GPL"); 206