Quelle  omap3pandora.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * omap3pandora.c  --  SoC audio for Pandora Handheld Console
 *
 * Author: Gražvydas Ignotas <notasas@gmail.com>
 */

#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/gpio/consumer.h>
#include <linux/delay.h>
#include <linux/regulator/consumer.h>
#include <linux/module.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>

#include <asm/mach-types.h>
#include <linux/platform_data/asoc-ti-mcbsp.h>

#include "omap-mcbsp.h"

#define PREFIX "ASoC omap3pandora: "

static struct regulator *omap3pandora_dac_reg;
static struct gpio_desc *dac_power_gpio;
static struct gpio_desc *amp_power_gpio;

static int omap3pandora_hw_params(struct snd_pcm_substream *substream,
 struct snd_pcm_hw_params *params)
{
 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
 struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
 int ret;

 /* Set the codec system clock for DAC and ADC */
 ret = snd_soc_dai_set_sysclk(codec_dai, 0, 26000000,
         SND_SOC_CLOCK_IN);
 if (ret < 0) {
  pr_err(PREFIX "can't set codec system clock\n");
  return ret;
 }

 /* Set McBSP clock to external */
 ret = snd_soc_dai_set_sysclk(cpu_dai, OMAP_MCBSP_SYSCLK_CLKS_EXT,
         256 * params_rate(params),
         SND_SOC_CLOCK_IN);
 if (ret < 0) {
  pr_err(PREFIX "can't set cpu system clock\n");
  return ret;
 }

 ret = snd_soc_dai_set_clkdiv(cpu_dai, OMAP_MCBSP_CLKGDV, 8);
 if (ret < 0) {
  pr_err(PREFIX "can't set SRG clock divider\n");
  return ret;
 }

 return 0;
}

static int omap3pandora_dac_event(struct snd_soc_dapm_widget *w,
 struct snd_kcontrol *k, int event)
{
 int ret;

 /*
 * The PCM1773 DAC datasheet requires 1ms delay between switching
 * VCC power on/off and /PD pin high/low
 */
 if (SND_SOC_DAPM_EVENT_ON(event)) {
  ret = regulator_enable(omap3pandora_dac_reg);
  if (ret) {
   dev_err(w->dapm->dev, "Failed to power DAC: %d\n", ret);
   return ret;
  }
  mdelay(1);
  gpiod_set_value(dac_power_gpio, 1);
 } else {
  gpiod_set_value(dac_power_gpio, 0);
  mdelay(1);
  regulator_disable(omap3pandora_dac_reg);
 }

 return 0;
}

static int omap3pandora_hp_event(struct snd_soc_dapm_widget *w,
 struct snd_kcontrol *k, int event)
{
 if (SND_SOC_DAPM_EVENT_ON(event))
  gpiod_set_value(amp_power_gpio, 1);
 else
  gpiod_set_value(amp_power_gpio, 0);

 return 0;
}

/*
 * Audio paths on Pandora board:
 *
 *  |O| ---> PCM DAC +-> AMP -> Headphone Jack
 *  |M|         A    +--------> Line Out
 *  |A| <~~clk~~+
 *  |P| <--- TWL4030 <--------- Line In and MICs
 */
static const struct snd_soc_dapm_widget omap3pandora_dapm_widgets[] = {
 SND_SOC_DAPM_DAC_E("PCM DAC", "HiFi Playback", SND_SOC_NOPM,
      0, 0, omap3pandora_dac_event,
      SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
 SND_SOC_DAPM_PGA_E("Headphone Amplifier", SND_SOC_NOPM,
      0, 0, NULL, 0, omap3pandora_hp_event,
      SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
 SND_SOC_DAPM_HP("Headphone Jack", NULL),
 SND_SOC_DAPM_LINE("Line Out", NULL),

 SND_SOC_DAPM_MIC("Mic (internal)", NULL),
 SND_SOC_DAPM_MIC("Mic (external)", NULL),
 SND_SOC_DAPM_LINE("Line In", NULL),
};

static const struct snd_soc_dapm_route omap3pandora_map[] = {
 {"PCM DAC", NULL, "APLL Enable"},
 {"Headphone Amplifier", NULL, "PCM DAC"},
 {"Line Out", NULL, "PCM DAC"},
 {"Headphone Jack", NULL, "Headphone Amplifier"},

 {"AUXL", NULL, "Line In"},
 {"AUXR", NULL, "Line In"},

 {"MAINMIC", NULL, "Mic (internal)"},
 {"Mic (internal)", NULL, "Mic Bias 1"},

 {"SUBMIC", NULL, "Mic (external)"},
 {"Mic (external)", NULL, "Mic Bias 2"},
};

static int omap3pandora_out_init(struct snd_soc_pcm_runtime *rtd)
{
 struct snd_soc_dapm_context *dapm = &rtd->card->dapm;

 /* All TWL4030 output pins are floating */
 snd_soc_dapm_nc_pin(dapm, "EARPIECE");
 snd_soc_dapm_nc_pin(dapm, "PREDRIVEL");
 snd_soc_dapm_nc_pin(dapm, "PREDRIVER");
 snd_soc_dapm_nc_pin(dapm, "HSOL");
 snd_soc_dapm_nc_pin(dapm, "HSOR");
 snd_soc_dapm_nc_pin(dapm, "CARKITL");
 snd_soc_dapm_nc_pin(dapm, "CARKITR");
 snd_soc_dapm_nc_pin(dapm, "HFL");
 snd_soc_dapm_nc_pin(dapm, "HFR");
 snd_soc_dapm_nc_pin(dapm, "VIBRA");

 return 0;
}

static int omap3pandora_in_init(struct snd_soc_pcm_runtime *rtd)
{
 struct snd_soc_dapm_context *dapm = &rtd->card->dapm;

 /* Not comnnected */
 snd_soc_dapm_nc_pin(dapm, "HSMIC");
 snd_soc_dapm_nc_pin(dapm, "CARKITMIC");
 snd_soc_dapm_nc_pin(dapm, "DIGIMIC0");
 snd_soc_dapm_nc_pin(dapm, "DIGIMIC1");

 return 0;
}

static const struct snd_soc_ops omap3pandora_ops = {
 .hw_params = omap3pandora_hw_params,
};

/* Digital audio interface glue - connects codec <--> CPU */
SND_SOC_DAILINK_DEFS(out,
 DAILINK_COMP_ARRAY(COMP_CPU("omap-mcbsp.2")),
 DAILINK_COMP_ARRAY(COMP_CODEC("twl4030-codec", "twl4030-hifi")),
 DAILINK_COMP_ARRAY(COMP_PLATFORM("omap-mcbsp.2")));

SND_SOC_DAILINK_DEFS(in,
 DAILINK_COMP_ARRAY(COMP_CPU("omap-mcbsp.4")),
 DAILINK_COMP_ARRAY(COMP_CODEC("twl4030-codec", "twl4030-hifi")),
 DAILINK_COMP_ARRAY(COMP_PLATFORM("omap-mcbsp.4")));

static struct snd_soc_dai_link omap3pandora_dai[] = {
 {
  .name = "PCM1773",
  .stream_name = "HiFi Out",
  .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
      SND_SOC_DAIFMT_CBC_CFC,
  .ops = &omap3pandora_ops,
  .init = omap3pandora_out_init,
  SND_SOC_DAILINK_REG(out),
 }, {
  .name = "TWL4030",
  .stream_name = "Line/Mic In",
  .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
      SND_SOC_DAIFMT_CBC_CFC,
  .ops = &omap3pandora_ops,
  .init = omap3pandora_in_init,
  SND_SOC_DAILINK_REG(in),
 }
};

/* SoC card */
static struct snd_soc_card snd_soc_card_omap3pandora = {
 .name = "omap3pandora",
 .owner = THIS_MODULE,
 .dai_link = omap3pandora_dai,
 .num_links = ARRAY_SIZE(omap3pandora_dai),

 .dapm_widgets = omap3pandora_dapm_widgets,
 .num_dapm_widgets = ARRAY_SIZE(omap3pandora_dapm_widgets),
 .dapm_routes = omap3pandora_map,
 .num_dapm_routes = ARRAY_SIZE(omap3pandora_map),
};

static struct platform_device *omap3pandora_snd_device;

static int __init omap3pandora_soc_init(void)
{
 int ret;

 if (!machine_is_omap3_pandora())
  return -ENODEV;

 pr_info("OMAP3 Pandora SoC init\n");

 omap3pandora_snd_device = platform_device_alloc("soc-audio", -1);
 if (omap3pandora_snd_device == NULL) {
  pr_err(PREFIX "Platform device allocation failed\n");
  return -ENOMEM;
 }

 platform_set_drvdata(omap3pandora_snd_device, &snd_soc_card_omap3pandora);

 ret = platform_device_add(omap3pandora_snd_device);
 if (ret) {
  pr_err(PREFIX "Unable to add platform device\n");
  goto fail2;
 }

 dac_power_gpio = devm_gpiod_get(&omap3pandora_snd_device->dev,
     "dac", GPIOD_OUT_LOW);
 if (IS_ERR(dac_power_gpio)) {
  ret = PTR_ERR(dac_power_gpio);
  goto fail3;
 }

 amp_power_gpio = devm_gpiod_get(&omap3pandora_snd_device->dev,
     "amp", GPIOD_OUT_LOW);
 if (IS_ERR(amp_power_gpio)) {
  ret = PTR_ERR(amp_power_gpio);
  goto fail3;
 }

 omap3pandora_dac_reg = regulator_get(&omap3pandora_snd_device->dev, "vcc");
 if (IS_ERR(omap3pandora_dac_reg)) {
  pr_err(PREFIX "Failed to get DAC regulator from %s: %ld\n",
   dev_name(&omap3pandora_snd_device->dev),
   PTR_ERR(omap3pandora_dac_reg));
  ret = PTR_ERR(omap3pandora_dac_reg);
  goto fail3;
 }

 return 0;

fail3:
 platform_device_del(omap3pandora_snd_device);
fail2:
 platform_device_put(omap3pandora_snd_device);

 return ret;
}
module_init(omap3pandora_soc_init);

static void __exit omap3pandora_soc_exit(void)
{
 regulator_put(omap3pandora_dac_reg);
 platform_device_unregister(omap3pandora_snd_device);
}
module_exit(omap3pandora_soc_exit);

MODULE_AUTHOR("Grazvydas Ignotas ");
MODULE_DESCRIPTION("ALSA SoC OMAP3 Pandora");
MODULE_LICENSE("GPL");