target/linux/bcm27xx/patches-4.19/950-0082-Driver-support-for-Google-voiceHAT-soundcard.patch

   1 From ae0077658c007643020b88e233150cf1eca6cea8 Mon Sep 17 00:00:00 2001
   2 From: Peter Malkin <petermalkin@google.com>
   3 Date: Mon, 27 Mar 2017 16:38:21 -0700
   4 Subject: [PATCH] Driver support for Google voiceHAT soundcard.
   5
   6 ASoC: googlevoicehat-codec: Use correct device when grabbing GPIO
   7
   8 The fixup for the VoiceHAT in 4.18 incorrectly tried to find the
   9 sdmode GPIO pin under the card device, not the codec device.
  10 This failed, and therefore caused the device probe to fail.
  11
  12 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
  13
  14 ASoC: googlevoicehat-codec: Reformat for kernel coding standards
  15
  16 Fix all whitespace, indentation, and bracing errors.
  17
  18 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
  19
  20 ASoC: googlevoicehat-codec: Make driver function structure const
  21
  22 Make voicehat_component_driver a const structure.
  23
  24 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
  25
  26 ASoC: googlevoicehat-codec: Only convert from ms to jiffies once
  27
  28 Minor optimisation and allows to become checkpatch clean.
  29 A msec value is read out of DT or from a define, and convert once to
  30 jiffies, rather than every time that it is used.
  31
  32 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
  33 ---
  34  sound/soc/bcm/googlevoicehat-codec.c | 214 +++++++++++++++++++++++++++
  35  1 file changed, 214 insertions(+)
  36  create mode 100644 sound/soc/bcm/googlevoicehat-codec.c
  37
  38 --- /dev/null
  39 +++ b/sound/soc/bcm/googlevoicehat-codec.c
  40 @@ -0,0 +1,214 @@
  41 +/*
  42 + * Driver for the Google voiceHAT audio codec for Raspberry Pi.
  43 + *
  44 + * Author:     Peter Malkin <petermalkin@google.com>
  45 + *             Copyright 2016
  46 + *
  47 + * This program is free software; you can redistribute it and/or
  48 + * modify it under the terms of the GNU General Public License
  49 + * version 2 as published by the Free Software Foundation.
  50 + *
  51 + * This program is distributed in the hope that it will be useful, but
  52 + * WITHOUT ANY WARRANTY; without even the implied warranty of
  53 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  54 + * General Public License for more details.
  55 + */
  56 +
  57 +#include <linux/device.h>
  58 +#include <linux/err.h>
  59 +#include <linux/gpio.h>
  60 +#include <linux/gpio/consumer.h>
  61 +#include <linux/init.h>
  62 +#include <linux/kernel.h>
  63 +#include <linux/mod_devicetable.h>
  64 +#include <linux/module.h>
  65 +#include <linux/of.h>
  66 +#include <linux/platform_device.h>
  67 +#include <linux/version.h>
  68 +#include <sound/pcm.h>
  69 +#include <sound/soc.h>
  70 +#include <sound/soc-dai.h>
  71 +#include <sound/soc-dapm.h>
  72 +
  73 +#define ICS43432_RATE_MIN_HZ   7190  /* from data sheet */
  74 +#define ICS43432_RATE_MAX_HZ   52800 /* from data sheet */
  75 +/* Delay in enabling SDMODE after clock settles to remove pop */
  76 +#define SDMODE_DELAY_MS                5
  77 +
  78 +struct voicehat_priv {
  79 +       struct delayed_work enable_sdmode_work;
  80 +       struct gpio_desc *sdmode_gpio;
  81 +       unsigned long sdmode_delay_jiffies;
  82 +};
  83 +
  84 +static void voicehat_enable_sdmode_work(struct work_struct *work)
  85 +{
  86 +       struct voicehat_priv *voicehat = container_of(work,
  87 +                                                     struct voicehat_priv,
  88 +                                                     enable_sdmode_work.work);
  89 +       gpiod_set_value(voicehat->sdmode_gpio, 1);
  90 +}
  91 +
  92 +static int voicehat_component_probe(struct snd_soc_component *component)
  93 +{
  94 +       struct voicehat_priv *voicehat =
  95 +                               snd_soc_component_get_drvdata(component);
  96 +
  97 +       voicehat->sdmode_gpio = devm_gpiod_get(component->dev, "sdmode",
  98 +                                              GPIOD_OUT_LOW);
  99 +       if (IS_ERR(voicehat->sdmode_gpio)) {
 100 +               dev_err(component->dev, "Unable to allocate GPIO pin\n");
 101 +               return PTR_ERR(voicehat->sdmode_gpio);
 102 +       }
 103 +
 104 +       INIT_DELAYED_WORK(&voicehat->enable_sdmode_work,
 105 +                         voicehat_enable_sdmode_work);
 106 +       return 0;
 107 +}
 108 +
 109 +static void voicehat_component_remove(struct snd_soc_component *component)
 110 +{
 111 +       struct voicehat_priv *voicehat =
 112 +                               snd_soc_component_get_drvdata(component);
 113 +
 114 +       cancel_delayed_work_sync(&voicehat->enable_sdmode_work);
 115 +}
 116 +
 117 +static const struct snd_soc_dapm_widget voicehat_dapm_widgets[] = {
 118 +       SND_SOC_DAPM_OUTPUT("Speaker"),
 119 +};
 120 +
 121 +static const struct snd_soc_dapm_route voicehat_dapm_routes[] = {
 122 +       {"Speaker", NULL, "HiFi Playback"},
 123 +};
 124 +
 125 +static const struct snd_soc_component_driver voicehat_component_driver = {
 126 +       .probe = voicehat_component_probe,
 127 +       .remove = voicehat_component_remove,
 128 +       .dapm_widgets = voicehat_dapm_widgets,
 129 +       .num_dapm_widgets = ARRAY_SIZE(voicehat_dapm_widgets),
 130 +       .dapm_routes = voicehat_dapm_routes,
 131 +       .num_dapm_routes = ARRAY_SIZE(voicehat_dapm_routes),
 132 +};
 133 +
 134 +static int voicehat_daiops_trigger(struct snd_pcm_substream *substream, int cmd,
 135 +                                  struct snd_soc_dai *dai)
 136 +{
 137 +       struct snd_soc_component *component = dai->component;
 138 +       struct voicehat_priv *voicehat =
 139 +                               snd_soc_component_get_drvdata(component);
 140 +
 141 +       if (voicehat->sdmode_delay_jiffies == 0)
 142 +               return 0;
 143 +
 144 +       dev_dbg(dai->dev, "CMD             %d", cmd);
 145 +       dev_dbg(dai->dev, "Playback Active %d", dai->playback_active);
 146 +       dev_dbg(dai->dev, "Capture Active  %d", dai->capture_active);
 147 +
 148 +       switch (cmd) {
 149 +       case SNDRV_PCM_TRIGGER_START:
 150 +       case SNDRV_PCM_TRIGGER_RESUME:
 151 +       case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 152 +               if (dai->playback_active) {
 153 +                       dev_info(dai->dev, "Enabling audio amp...\n");
 154 +                       queue_delayed_work(
 155 +                               system_power_efficient_wq,
 156 +                               &voicehat->enable_sdmode_work,
 157 +                               voicehat->sdmode_delay_jiffies);
 158 +               }
 159 +               break;
 160 +       case SNDRV_PCM_TRIGGER_STOP:
 161 +       case SNDRV_PCM_TRIGGER_SUSPEND:
 162 +       case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 163 +               if (dai->playback_active) {
 164 +                       cancel_delayed_work(&voicehat->enable_sdmode_work);
 165 +                       dev_info(dai->dev, "Disabling audio amp...\n");
 166 +                       gpiod_set_value(voicehat->sdmode_gpio, 0);
 167 +               }
 168 +               break;
 169 +       }
 170 +       return 0;
 171 +}
 172 +
 173 +static const struct snd_soc_dai_ops voicehat_dai_ops = {
 174 +       .trigger = voicehat_daiops_trigger,
 175 +};
 176 +
 177 +static struct snd_soc_dai_driver voicehat_dai = {
 178 +       .name = "voicehat-hifi",
 179 +       .capture = {
 180 +               .stream_name = "HiFi Capture",
 181 +               .channels_min = 2,
 182 +               .channels_max = 2,
 183 +               .rates = SNDRV_PCM_RATE_48000,
 184 +               .formats = SNDRV_PCM_FMTBIT_S32_LE
 185 +       },
 186 +       .playback = {
 187 +               .stream_name = "HiFi Playback",
 188 +               .channels_min = 2,
 189 +               .channels_max = 2,
 190 +               .rates = SNDRV_PCM_RATE_48000,
 191 +               .formats = SNDRV_PCM_FMTBIT_S32_LE
 192 +       },
 193 +       .ops = &voicehat_dai_ops,
 194 +       .symmetric_rates = 1
 195 +};
 196 +
 197 +#ifdef CONFIG_OF
 198 +static const struct of_device_id voicehat_ids[] = {
 199 +               { .compatible = "google,voicehat", }, {}
 200 +       };
 201 +       MODULE_DEVICE_TABLE(of, voicehat_ids);
 202 +#endif
 203 +
 204 +static int voicehat_platform_probe(struct platform_device *pdev)
 205 +{
 206 +       struct voicehat_priv *voicehat;
 207 +       unsigned int sdmode_delay;
 208 +       int ret;
 209 +
 210 +       voicehat = devm_kzalloc(&pdev->dev, sizeof(*voicehat), GFP_KERNEL);
 211 +       if (!voicehat)
 212 +               return -ENOMEM;
 213 +
 214 +       ret = device_property_read_u32(&pdev->dev, "voicehat_sdmode_delay",
 215 +                                      &sdmode_delay);
 216 +
 217 +       if (ret) {
 218 +               sdmode_delay = SDMODE_DELAY_MS;
 219 +               dev_info(&pdev->dev,
 220 +                        "property 'voicehat_sdmode_delay' not found default 5 mS");
 221 +       } else {
 222 +               dev_info(&pdev->dev, "property 'voicehat_sdmode_delay' found delay= %d mS",
 223 +                        sdmode_delay);
 224 +       }
 225 +       voicehat->sdmode_delay_jiffies = msecs_to_jiffies(sdmode_delay);
 226 +
 227 +       dev_set_drvdata(&pdev->dev, voicehat);
 228 +
 229 +       return snd_soc_register_component(&pdev->dev,
 230 +                                         &voicehat_component_driver,
 231 +                                         &voicehat_dai,
 232 +                                         1);
 233 +}
 234 +
 235 +static int voicehat_platform_remove(struct platform_device *pdev)
 236 +{
 237 +       snd_soc_unregister_component(&pdev->dev);
 238 +       return 0;
 239 +}
 240 +
 241 +static struct platform_driver voicehat_driver = {
 242 +       .driver = {
 243 +               .name = "voicehat-codec",
 244 +               .of_match_table = of_match_ptr(voicehat_ids),
 245 +       },
 246 +       .probe = voicehat_platform_probe,
 247 +       .remove = voicehat_platform_remove,
 248 +};
 249 +
 250 +module_platform_driver(voicehat_driver);
 251 +
 252 +MODULE_DESCRIPTION("Google voiceHAT Codec driver");
 253 +MODULE_AUTHOR("Peter Malkin <petermalkin@google.com>");
 254 +MODULE_LICENSE("GPL v2");