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| 1 | +/* |
| 2 | + * Driver for the Google voiceHAT audio codec for Raspberry Pi. |
| 3 | + * |
| 4 | + * Author: Peter Malkin <petermalkin@google.com> |
| 5 | + * Copyright 2016 |
| 6 | + * |
| 7 | + * This program is free software; you can redistribute it and/or |
| 8 | + * modify it under the terms of the GNU General Public License |
| 9 | + * version 2 as published by the Free Software Foundation. |
| 10 | + * |
| 11 | + * This program is distributed in the hope that it will be useful, but |
| 12 | + * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | + * General Public License for more details. |
| 15 | + */ |
| 16 | + |
| 17 | +#include <linux/device.h> |
| 18 | +#include <linux/err.h> |
| 19 | +#include <linux/gpio.h> |
| 20 | +#include <linux/gpio/consumer.h> |
| 21 | +#include <linux/init.h> |
| 22 | +#include <linux/kernel.h> |
| 23 | +#include <linux/mod_devicetable.h> |
| 24 | +#include <linux/module.h> |
| 25 | +#include <linux/of.h> |
| 26 | +#include <linux/platform_device.h> |
| 27 | +#include <linux/version.h> |
| 28 | +#include <sound/pcm.h> |
| 29 | +#include <sound/soc.h> |
| 30 | +#include <sound/soc-dai.h> |
| 31 | +#include <sound/soc-dapm.h> |
| 32 | + |
| 33 | +#define ICS43432_RATE_MIN_HZ 7190 /* from data sheet */ |
| 34 | +#define ICS43432_RATE_MAX_HZ 52800 /* from data sheet */ |
| 35 | +#define SDMODE_DELAY_MS \ |
| 36 | + 5 /* Delay in enabling SDMODE after clock settles to remove pop */ |
| 37 | + |
| 38 | +struct voicehat_priv { |
| 39 | + struct delayed_work enable_sdmode_work; |
| 40 | + struct gpio_desc *sdmode_gpio; |
| 41 | + unsigned int sdmode_delay; |
| 42 | +}; |
| 43 | + |
| 44 | +static void voicehat_enable_sdmode_work(struct work_struct *work) { |
| 45 | + struct voicehat_priv *voicehat = |
| 46 | + container_of(work, struct voicehat_priv, enable_sdmode_work.work); |
| 47 | + gpiod_set_value(voicehat->sdmode_gpio, 1); |
| 48 | +} |
| 49 | + |
| 50 | +static int voicehat_codec_probe(struct snd_soc_codec *codec) { |
| 51 | + struct voicehat_priv *voicehat = snd_soc_codec_get_drvdata(codec); |
| 52 | + |
| 53 | + voicehat->sdmode_gpio = devm_gpiod_get(codec->dev, "sdmode", GPIOD_OUT_LOW); |
| 54 | + if (IS_ERR(voicehat->sdmode_gpio)) { |
| 55 | + dev_err(codec->dev, "Unable to allocate GPIO pin\n"); |
| 56 | + return PTR_ERR(voicehat->sdmode_gpio); |
| 57 | + } |
| 58 | + |
| 59 | + INIT_DELAYED_WORK(&voicehat->enable_sdmode_work, voicehat_enable_sdmode_work); |
| 60 | + return 0; |
| 61 | +} |
| 62 | + |
| 63 | +static int voicehat_codec_remove(struct snd_soc_codec *codec) { |
| 64 | + struct voicehat_priv *voicehat = snd_soc_codec_get_drvdata(codec); |
| 65 | + |
| 66 | + cancel_delayed_work_sync(&voicehat->enable_sdmode_work); |
| 67 | + |
| 68 | + return 0; |
| 69 | +} |
| 70 | + |
| 71 | +static const struct snd_soc_dapm_widget voicehat_dapm_widgets[] = { |
| 72 | + SND_SOC_DAPM_OUTPUT("Speaker"), |
| 73 | +}; |
| 74 | + |
| 75 | +static const struct snd_soc_dapm_route voicehat_dapm_routes[] = { |
| 76 | + {"Speaker", NULL, "HiFi Playback"}, |
| 77 | +}; |
| 78 | + |
| 79 | +static struct snd_soc_codec_driver voicehat_codec_driver = { |
| 80 | + .probe = voicehat_codec_probe, |
| 81 | + .remove = voicehat_codec_remove, |
| 82 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0) |
| 83 | + .component_driver = { |
| 84 | +#endif |
| 85 | + .dapm_widgets = voicehat_dapm_widgets, |
| 86 | + .num_dapm_widgets = ARRAY_SIZE(voicehat_dapm_widgets), |
| 87 | + .dapm_routes = voicehat_dapm_routes, |
| 88 | + .num_dapm_routes = ARRAY_SIZE(voicehat_dapm_routes), |
| 89 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0) |
| 90 | + }, |
| 91 | +#endif |
| 92 | +}; |
| 93 | + |
| 94 | +static int voicehat_daiops_trigger(struct snd_pcm_substream *substream, int cmd, |
| 95 | + struct snd_soc_dai *dai) { |
| 96 | + struct snd_soc_codec *codec = dai->codec; |
| 97 | + struct voicehat_priv *voicehat = snd_soc_codec_get_drvdata(codec); |
| 98 | + |
| 99 | + if (voicehat->sdmode_delay == 0) return 0; |
| 100 | + |
| 101 | + dev_dbg(dai->dev, "CMD %d", cmd); |
| 102 | + dev_dbg(dai->dev, "Playback Active %d", dai->playback_active); |
| 103 | + dev_dbg(dai->dev, "Capture Active %d", dai->capture_active); |
| 104 | + |
| 105 | + switch (cmd) { |
| 106 | + case SNDRV_PCM_TRIGGER_START: |
| 107 | + case SNDRV_PCM_TRIGGER_RESUME: |
| 108 | + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| 109 | + if (dai->playback_active) { |
| 110 | + dev_info(dai->dev, "Enabling audio amp...\n"); |
| 111 | + queue_delayed_work(system_power_efficient_wq, |
| 112 | + &voicehat->enable_sdmode_work, |
| 113 | + msecs_to_jiffies(voicehat->sdmode_delay)); |
| 114 | + } |
| 115 | + break; |
| 116 | + case SNDRV_PCM_TRIGGER_STOP: |
| 117 | + case SNDRV_PCM_TRIGGER_SUSPEND: |
| 118 | + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| 119 | + if (dai->playback_active) { |
| 120 | + cancel_delayed_work(&voicehat->enable_sdmode_work); |
| 121 | + dev_info(dai->dev, "Disabling audio amp...\n"); |
| 122 | + gpiod_set_value(voicehat->sdmode_gpio, 0); |
| 123 | + } |
| 124 | + break; |
| 125 | + } |
| 126 | + return 0; |
| 127 | +} |
| 128 | + |
| 129 | +static const struct snd_soc_dai_ops voicehat_dai_ops = { |
| 130 | + .trigger = voicehat_daiops_trigger, |
| 131 | +}; |
| 132 | + |
| 133 | +static struct snd_soc_dai_driver voicehat_dai = { |
| 134 | + .name = "voicehat-hifi", |
| 135 | + .capture = {.stream_name = "HiFi Capture", |
| 136 | + .channels_min = 2, |
| 137 | + .channels_max = 2, |
| 138 | + .rates = SNDRV_PCM_RATE_48000, |
| 139 | + .formats = SNDRV_PCM_FMTBIT_S32_LE}, |
| 140 | + .playback = {.stream_name = "HiFi Playback", |
| 141 | + .channels_min = 2, |
| 142 | + .channels_max = 2, |
| 143 | + .rates = SNDRV_PCM_RATE_48000, |
| 144 | + .formats = SNDRV_PCM_FMTBIT_S32_LE}, |
| 145 | + .ops = &voicehat_dai_ops, |
| 146 | + .symmetric_rates = 1}; |
| 147 | + |
| 148 | +#ifdef CONFIG_OF |
| 149 | +static const struct of_device_id voicehat_ids[] = { |
| 150 | + { |
| 151 | + .compatible = "google,voicehat", |
| 152 | + }, |
| 153 | + {}}; |
| 154 | +MODULE_DEVICE_TABLE(of, voicehat_ids); |
| 155 | +#endif |
| 156 | + |
| 157 | +static int voicehat_platform_probe(struct platform_device *pdev) { |
| 158 | + struct voicehat_priv *voicehat; |
| 159 | + int ret; |
| 160 | + |
| 161 | + voicehat = devm_kzalloc(&pdev->dev, sizeof(*voicehat), GFP_KERNEL); |
| 162 | + if (!voicehat) return -ENOMEM; |
| 163 | + |
| 164 | + ret = device_property_read_u32(&pdev->dev, "voicehat_sdmode_delay", |
| 165 | + &voicehat->sdmode_delay); |
| 166 | + |
| 167 | + if (ret) { |
| 168 | + voicehat->sdmode_delay = SDMODE_DELAY_MS; |
| 169 | + dev_info(&pdev->dev, |
| 170 | + "property 'voicehat_sdmode_delay' not found default 5 mS"); |
| 171 | + } else { |
| 172 | + dev_info(&pdev->dev, "property 'voicehat_sdmode_delay' found delay= %d mS", |
| 173 | + voicehat->sdmode_delay); |
| 174 | + } |
| 175 | + |
| 176 | + dev_set_drvdata(&pdev->dev, voicehat); |
| 177 | + |
| 178 | + return snd_soc_register_codec(&pdev->dev, &voicehat_codec_driver, &voicehat_dai, 1); |
| 179 | +} |
| 180 | + |
| 181 | +static int voicehat_platform_remove(struct platform_device *pdev) { |
| 182 | + snd_soc_unregister_codec(&pdev->dev); |
| 183 | + return 0; |
| 184 | +} |
| 185 | + |
| 186 | +static struct platform_driver voicehat_driver = { |
| 187 | + .driver = |
| 188 | + { |
| 189 | + .name = "voicehat-codec", .of_match_table = of_match_ptr(voicehat_ids), |
| 190 | + }, |
| 191 | + .probe = voicehat_platform_probe, |
| 192 | + .remove = voicehat_platform_remove, |
| 193 | +}; |
| 194 | + |
| 195 | +module_platform_driver(voicehat_driver); |
| 196 | + |
| 197 | +MODULE_DESCRIPTION("Google voiceHAT Codec driver"); |
| 198 | +MODULE_AUTHOR("Peter Malkin <petermalkin@google.com>"); |
| 199 | +MODULE_LICENSE("GPL v2"); |
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