git.librecmc.org Git - oweals/openwrt.git/blob

   1 From 846864bceccdafbed86c1b1766500861547b0da9 Mon Sep 17 00:00:00 2001
   2 From: Matt Flax <flatmax@flatmax.org>
   3 Date: Wed, 8 Mar 2017 20:04:13 +1100
   4 Subject: [PATCH] Add support for the AudioInjector.net Octo sound card
   5
   6 AudioInjector Octo: sample rates, regulators, reset
   7
   8 This patch adds new sample rates to the Audioinjector Octo sound card. The
   9 new supported rates are (in kHz) :
  10 96, 48, 32, 24, 16, 8, 88.2, 44.1, 29.4, 22.05, 14.7
  11
  12 Reference the bcm270x DT regulators in the overlay.
  13
  14 This patch adds a reset GPIO for the AudioInjector.net octo sound card.
  15
  16 Audioinjector octo : Make the playback and capture symmetric
  17
  18 This patch ensures that the sample rate and channel count of the audioinjector
  19 octo sound card are symmetric.
  20
  21 audioinjector-octo: Add continuous clock feature
  22
  23 By user request, add a switch to prevent the clocks being stopped when
  24 the stream is paused, stopped or shutdown. Provide access to the switch
  25 by adding a 'non-stop-clocks' parameter to the audioinjector-addons
  26 overlay.
  27
  28 See: https://github.com/raspberrypi/linux/issues/2409
  29
  30 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  31 ---
  32  sound/soc/bcm/audioinjector-octo-soundcard.c | 336 +++++++++++++++++++
  33  1 file changed, 336 insertions(+)
  34  create mode 100644 sound/soc/bcm/audioinjector-octo-soundcard.c
  35
  36 --- /dev/null
  37 +++ b/sound/soc/bcm/audioinjector-octo-soundcard.c
  38 @@ -0,0 +1,336 @@
  39 +/*
  40 + * ASoC Driver for AudioInjector Pi octo channel soundcard (hat)
  41 + *
  42 + *  Created on: 27-October-2016
  43 + *      Author: flatmax@flatmax.org
  44 + *              based on audioinjector-pi-soundcard.c
  45 + *
  46 + * Copyright (C) 2016 Flatmax Pty. Ltd.
  47 + *
  48 + * This program is free software; you can redistribute it and/or
  49 + * modify it under the terms of the GNU General Public License
  50 + * version 2 as published by the Free Software Foundation.
  51 + *
  52 + * This program is distributed in the hope that it will be useful, but
  53 + * WITHOUT ANY WARRANTY; without even the implied warranty of
  54 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  55 + * General Public License for more details.
  56 + */
  57 +
  58 +#include <linux/module.h>
  59 +#include <linux/types.h>
  60 +#include <linux/gpio/consumer.h>
  61 +
  62 +#include <sound/core.h>
  63 +#include <sound/soc.h>
  64 +#include <sound/pcm_params.h>
  65 +#include <sound/control.h>
  66 +
  67 +static struct gpio_descs *mult_gpios;
  68 +static struct gpio_desc *codec_rst_gpio;
  69 +static unsigned int audioinjector_octo_rate;
  70 +static bool non_stop_clocks;
  71 +
  72 +static const unsigned int audioinjector_octo_rates[] = {
  73 +       96000, 48000, 32000, 24000, 16000, 8000, 88200, 44100, 29400, 22050, 14700,
  74 +};
  75 +
  76 +static struct snd_pcm_hw_constraint_list audioinjector_octo_constraints = {
  77 +       .list = audioinjector_octo_rates,
  78 +       .count = ARRAY_SIZE(audioinjector_octo_rates),
  79 +};
  80 +
  81 +static int audioinjector_octo_dai_init(struct snd_soc_pcm_runtime *rtd)
  82 +{
  83 +       return snd_soc_dai_set_bclk_ratio(rtd->cpu_dai, 64);
  84 +}
  85 +
  86 +static int audioinjector_octo_startup(struct snd_pcm_substream *substream)
  87 +{
  88 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
  89 +       rtd->cpu_dai->driver->playback.channels_min = 8;
  90 +       rtd->cpu_dai->driver->playback.channels_max = 8;
  91 +       rtd->cpu_dai->driver->capture.channels_min = 8;
  92 +       rtd->cpu_dai->driver->capture.channels_max = 8;
  93 +       rtd->codec_dai->driver->capture.channels_max = 8;
  94 +
  95 +       snd_pcm_hw_constraint_list(substream->runtime, 0,
  96 +                               SNDRV_PCM_HW_PARAM_RATE,
  97 +                               &audioinjector_octo_constraints);
  98 +
  99 +       return 0;
 100 +}
 101 +
 102 +static void audioinjector_octo_shutdown(struct snd_pcm_substream *substream)
 103 +{
 104 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 105 +       rtd->cpu_dai->driver->playback.channels_min = 2;
 106 +       rtd->cpu_dai->driver->playback.channels_max = 2;
 107 +       rtd->cpu_dai->driver->capture.channels_min = 2;
 108 +       rtd->cpu_dai->driver->capture.channels_max = 2;
 109 +       rtd->codec_dai->driver->capture.channels_max = 6;
 110 +}
 111 +
 112 +static int audioinjector_octo_hw_params(struct snd_pcm_substream *substream,
 113 +       struct snd_pcm_hw_params *params)
 114 +{
 115 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 116 +
 117 +       // set codec DAI configuration
 118 +       int ret = snd_soc_dai_set_fmt(rtd->codec_dai,
 119 +                       SND_SOC_DAIFMT_CBS_CFS|SND_SOC_DAIFMT_DSP_A|
 120 +                       SND_SOC_DAIFMT_NB_NF);
 121 +       if (ret < 0)
 122 +               return ret;
 123 +
 124 +       // set cpu DAI configuration
 125 +       ret = snd_soc_dai_set_fmt(rtd->cpu_dai,
 126 +                       SND_SOC_DAIFMT_CBM_CFM|SND_SOC_DAIFMT_I2S|
 127 +                       SND_SOC_DAIFMT_NB_NF);
 128 +       if (ret < 0)
 129 +               return ret;
 130 +
 131 +       audioinjector_octo_rate = params_rate(params);
 132 +
 133 +       // Set the correct sysclock for the codec
 134 +       switch (audioinjector_octo_rate) {
 135 +       case 96000:
 136 +       case 48000:
 137 +               return snd_soc_dai_set_sysclk(rtd->codec_dai, 0, 49152000,
 138 +                                                                       0);
 139 +               break;
 140 +       case 24000:
 141 +               return snd_soc_dai_set_sysclk(rtd->codec_dai, 0, 49152000/2,
 142 +                                                                       0);
 143 +               break;
 144 +       case 32000:
 145 +       case 16000:
 146 +               return snd_soc_dai_set_sysclk(rtd->codec_dai, 0, 49152000/3,
 147 +                                                                       0);
 148 +               break;
 149 +       case 8000:
 150 +               return snd_soc_dai_set_sysclk(rtd->codec_dai, 0, 49152000/6,
 151 +                                                                       0);
 152 +               break;
 153 +       case 88200:
 154 +       case 44100:
 155 +               return snd_soc_dai_set_sysclk(rtd->codec_dai, 0, 45185400,
 156 +                                                                       0);
 157 +               break;
 158 +       case 22050:
 159 +               return snd_soc_dai_set_sysclk(rtd->codec_dai, 0, 45185400/2,
 160 +                                                                       0);
 161 +               break;
 162 +       case 29400:
 163 +       case 14700:
 164 +               return snd_soc_dai_set_sysclk(rtd->codec_dai, 0, 45185400/3,
 165 +                                                                       0);
 166 +               break;
 167 +       default:
 168 +               return -EINVAL;
 169 +       }
 170 +}
 171 +
 172 +static int audioinjector_octo_trigger(struct snd_pcm_substream *substream,
 173 +                                                               int cmd){
 174 +       int mult[4];
 175 +
 176 +       memset(mult, 0, sizeof(mult));
 177 +
 178 +       switch (cmd) {
 179 +       case SNDRV_PCM_TRIGGER_STOP:
 180 +       case SNDRV_PCM_TRIGGER_SUSPEND:
 181 +       case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 182 +               if (!non_stop_clocks)
 183 +                       break;
 184 +               /* Drop through... */
 185 +       case SNDRV_PCM_TRIGGER_START:
 186 +       case SNDRV_PCM_TRIGGER_RESUME:
 187 +       case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 188 +               switch (audioinjector_octo_rate) {
 189 +               case 96000:
 190 +                       mult[3] = 1;
 191 +               case 88200:
 192 +                       mult[1] = 1;
 193 +                       mult[2] = 1;
 194 +                       break;
 195 +               case 48000:
 196 +                       mult[3] = 1;
 197 +               case 44100:
 198 +                       mult[2] = 1;
 199 +                       break;
 200 +               case 32000:
 201 +                       mult[3] = 1;
 202 +               case 29400:
 203 +                       mult[0] = 1;
 204 +                       mult[1] = 1;
 205 +                       break;
 206 +               case 24000:
 207 +                       mult[3] = 1;
 208 +               case 22050:
 209 +                       mult[1] = 1;
 210 +                       break;
 211 +               case 16000:
 212 +                       mult[3] = 1;
 213 +               case 14700:
 214 +                       mult[0] = 1;
 215 +                       break;
 216 +               case 8000:
 217 +                       mult[3] = 1;
 218 +                       break;
 219 +               default:
 220 +                       return -EINVAL;
 221 +               }
 222 +               break;
 223 +       default:
 224 +               return -EINVAL;
 225 +       }
 226 +       gpiod_set_array_value_cansleep(mult_gpios->ndescs, mult_gpios->desc,
 227 +                                                                       mult);
 228 +
 229 +       return 0;
 230 +}
 231 +
 232 +static struct snd_soc_ops audioinjector_octo_ops = {
 233 +       .startup        = audioinjector_octo_startup,
 234 +       .shutdown       = audioinjector_octo_shutdown,
 235 +       .hw_params = audioinjector_octo_hw_params,
 236 +       .trigger = audioinjector_octo_trigger,
 237 +};
 238 +
 239 +static struct snd_soc_dai_link audioinjector_octo_dai[] = {
 240 +       {
 241 +               .name = "AudioInjector Octo",
 242 +               .stream_name = "AudioInject-HIFI",
 243 +               .codec_dai_name = "cs42448",
 244 +               .ops = &audioinjector_octo_ops,
 245 +               .init = audioinjector_octo_dai_init,
 246 +               .symmetric_rates = 1,
 247 +               .symmetric_channels = 1,
 248 +       },
 249 +};
 250 +
 251 +static const struct snd_soc_dapm_widget audioinjector_octo_widgets[] = {
 252 +       SND_SOC_DAPM_OUTPUT("OUTPUTS0"),
 253 +       SND_SOC_DAPM_OUTPUT("OUTPUTS1"),
 254 +       SND_SOC_DAPM_OUTPUT("OUTPUTS2"),
 255 +       SND_SOC_DAPM_OUTPUT("OUTPUTS3"),
 256 +       SND_SOC_DAPM_INPUT("INPUTS0"),
 257 +       SND_SOC_DAPM_INPUT("INPUTS1"),
 258 +       SND_SOC_DAPM_INPUT("INPUTS2"),
 259 +};
 260 +
 261 +static const struct snd_soc_dapm_route audioinjector_octo_route[] = {
 262 +       /* Balanced outputs */
 263 +       {"OUTPUTS0", NULL, "AOUT1L"},
 264 +       {"OUTPUTS0", NULL, "AOUT1R"},
 265 +       {"OUTPUTS1", NULL, "AOUT2L"},
 266 +       {"OUTPUTS1", NULL, "AOUT2R"},
 267 +       {"OUTPUTS2", NULL, "AOUT3L"},
 268 +       {"OUTPUTS2", NULL, "AOUT3R"},
 269 +       {"OUTPUTS3", NULL, "AOUT4L"},
 270 +       {"OUTPUTS3", NULL, "AOUT4R"},
 271 +
 272 +       /* Balanced inputs */
 273 +       {"AIN1L", NULL, "INPUTS0"},
 274 +       {"AIN1R", NULL, "INPUTS0"},
 275 +       {"AIN2L", NULL, "INPUTS1"},
 276 +       {"AIN2R", NULL, "INPUTS1"},
 277 +       {"AIN3L", NULL, "INPUTS2"},
 278 +       {"AIN3R", NULL, "INPUTS2"},
 279 +};
 280 +
 281 +static struct snd_soc_card snd_soc_audioinjector_octo = {
 282 +       .name = "audioinjector-octo-soundcard",
 283 +       .dai_link = audioinjector_octo_dai,
 284 +       .num_links = ARRAY_SIZE(audioinjector_octo_dai),
 285 +
 286 +       .dapm_widgets = audioinjector_octo_widgets,
 287 +       .num_dapm_widgets = ARRAY_SIZE(audioinjector_octo_widgets),
 288 +       .dapm_routes = audioinjector_octo_route,
 289 +       .num_dapm_routes = ARRAY_SIZE(audioinjector_octo_route),
 290 +};
 291 +
 292 +static int audioinjector_octo_probe(struct platform_device *pdev)
 293 +{
 294 +       struct snd_soc_card *card = &snd_soc_audioinjector_octo;
 295 +       int ret;
 296 +
 297 +       card->dev = &pdev->dev;
 298 +
 299 +       if (pdev->dev.of_node) {
 300 +               struct snd_soc_dai_link *dai = &audioinjector_octo_dai[0];
 301 +               struct device_node *i2s_node =
 302 +                                       of_parse_phandle(pdev->dev.of_node,
 303 +                                                       "i2s-controller", 0);
 304 +               struct device_node *codec_node =
 305 +                                       of_parse_phandle(pdev->dev.of_node,
 306 +                                                               "codec", 0);
 307 +
 308 +               mult_gpios = devm_gpiod_get_array_optional(&pdev->dev, "mult",
 309 +                                                               GPIOD_OUT_LOW);
 310 +               if (IS_ERR(mult_gpios))
 311 +                       return PTR_ERR(mult_gpios);
 312 +
 313 +               codec_rst_gpio = devm_gpiod_get_optional(&pdev->dev, "reset",
 314 +                                                               GPIOD_OUT_LOW);
 315 +               if (IS_ERR(codec_rst_gpio))
 316 +                       return PTR_ERR(codec_rst_gpio);
 317 +
 318 +               non_stop_clocks = of_property_read_bool(pdev->dev.of_node, "non-stop-clocks");
 319 +
 320 +               if (codec_rst_gpio)
 321 +                       gpiod_set_value(codec_rst_gpio, 1);
 322 +               msleep(500);
 323 +               if (codec_rst_gpio)
 324 +                       gpiod_set_value(codec_rst_gpio, 0);
 325 +               msleep(500);
 326 +               if (codec_rst_gpio)
 327 +                       gpiod_set_value(codec_rst_gpio, 1);
 328 +               msleep(500);
 329 +
 330 +               if (i2s_node && codec_node) {
 331 +                       dai->cpu_dai_name = NULL;
 332 +                       dai->cpu_of_node = i2s_node;
 333 +                       dai->platform_name = NULL;
 334 +                       dai->platform_of_node = i2s_node;
 335 +                       dai->codec_name = NULL;
 336 +                       dai->codec_of_node = codec_node;
 337 +               } else
 338 +                       if (!dai->cpu_of_node) {
 339 +                               dev_err(&pdev->dev,
 340 +                               "i2s-controller missing or invalid in DT\n");
 341 +                               return -EINVAL;
 342 +                       } else {
 343 +                               dev_err(&pdev->dev,
 344 +                               "Property 'codec' missing or invalid\n");
 345 +                               return -EINVAL;
 346 +                       }
 347 +       }
 348 +
 349 +       ret = devm_snd_soc_register_card(&pdev->dev, card);
 350 +       if (ret != 0)
 351 +               dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
 352 +       return ret;
 353 +}
 354 +
 355 +static const struct of_device_id audioinjector_octo_of_match[] = {
 356 +       { .compatible = "ai,audioinjector-octo-soundcard", },
 357 +       {},
 358 +};
 359 +MODULE_DEVICE_TABLE(of, audioinjector_octo_of_match);
 360 +
 361 +static struct platform_driver audioinjector_octo_driver = {
 362 +       .driver = {
 363 +               .name                   = "audioinjector-octo",
 364 +               .owner                  = THIS_MODULE,
 365 +               .of_match_table = audioinjector_octo_of_match,
 366 +       },
 367 +       .probe  = audioinjector_octo_probe,
 368 +};
 369 +
 370 +module_platform_driver(audioinjector_octo_driver);
 371 +MODULE_AUTHOR("Matt Flax <flatmax@flatmax.org>");
 372 +MODULE_DESCRIPTION("AudioInjector.net octo Soundcard");
 373 +MODULE_LICENSE("GPL v2");
 374 +MODULE_ALIAS("platform:audioinjector-octo-soundcard");