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f102d0d173
RT1015p needs 300ms delay after SDB pulling high for internal calibration during the power on sequence. Delays 300ms right before data sends out to avoid data truncated. Assuming the calibration state gets lost after system suspend. Signed-off-by: Tzung-Bi Shih <tzungbi@google.com> Link: https://lore.kernel.org/r/20201211051224.2307349-3-tzungbi@google.com Signed-off-by: Mark Brown <broonie@kernel.org>
144 lines
3.4 KiB
C
144 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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//
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// rt1015p.c -- RT1015P ALSA SoC audio amplifier driver
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//
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// Copyright 2020 The Linux Foundation. All rights reserved.
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/gpio/consumer.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <sound/pcm.h>
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#include <sound/soc.h>
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#include <sound/soc-dai.h>
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#include <sound/soc-dapm.h>
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struct rt1015p_priv {
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struct gpio_desc *sdb;
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bool calib_done;
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};
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static int rt1015p_sdb_event(struct snd_soc_dapm_widget *w,
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struct snd_kcontrol *kcontrol, int event)
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{
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struct snd_soc_component *component =
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snd_soc_dapm_to_component(w->dapm);
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struct rt1015p_priv *rt1015p =
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snd_soc_component_get_drvdata(component);
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if (!rt1015p->sdb)
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return 0;
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switch (event) {
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case SND_SOC_DAPM_PRE_PMU:
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gpiod_set_value_cansleep(rt1015p->sdb, 1);
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dev_dbg(component->dev, "set sdb to 1");
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if (!rt1015p->calib_done) {
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msleep(300);
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rt1015p->calib_done = true;
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}
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break;
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case SND_SOC_DAPM_POST_PMD:
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gpiod_set_value_cansleep(rt1015p->sdb, 0);
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dev_dbg(component->dev, "set sdb to 0");
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break;
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default:
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break;
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}
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return 0;
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}
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static const struct snd_soc_dapm_widget rt1015p_dapm_widgets[] = {
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SND_SOC_DAPM_OUTPUT("Speaker"),
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SND_SOC_DAPM_OUT_DRV_E("SDB", SND_SOC_NOPM, 0, 0, NULL, 0,
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rt1015p_sdb_event,
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SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
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};
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static const struct snd_soc_dapm_route rt1015p_dapm_routes[] = {
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{"SDB", NULL, "HiFi Playback"},
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{"Speaker", NULL, "SDB"},
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};
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#ifdef CONFIG_PM
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static int rt1015p_suspend(struct snd_soc_component *component)
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{
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struct rt1015p_priv *rt1015p = snd_soc_component_get_drvdata(component);
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rt1015p->calib_done = false;
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return 0;
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}
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#else
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#define rt1015p_suspend NULL
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#endif
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static const struct snd_soc_component_driver rt1015p_component_driver = {
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.suspend = rt1015p_suspend,
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.dapm_widgets = rt1015p_dapm_widgets,
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.num_dapm_widgets = ARRAY_SIZE(rt1015p_dapm_widgets),
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.dapm_routes = rt1015p_dapm_routes,
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.num_dapm_routes = ARRAY_SIZE(rt1015p_dapm_routes),
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.idle_bias_on = 1,
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.use_pmdown_time = 1,
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.endianness = 1,
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.non_legacy_dai_naming = 1,
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};
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static struct snd_soc_dai_driver rt1015p_dai_driver = {
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.name = "HiFi",
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.playback = {
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.stream_name = "HiFi Playback",
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.formats = SNDRV_PCM_FMTBIT_S24,
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.rates = SNDRV_PCM_RATE_48000,
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.channels_min = 1,
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.channels_max = 2,
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},
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};
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static int rt1015p_platform_probe(struct platform_device *pdev)
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{
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struct rt1015p_priv *rt1015p;
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rt1015p = devm_kzalloc(&pdev->dev, sizeof(*rt1015p), GFP_KERNEL);
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if (!rt1015p)
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return -ENOMEM;
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rt1015p->sdb = devm_gpiod_get_optional(&pdev->dev,
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"sdb", GPIOD_OUT_LOW);
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if (IS_ERR(rt1015p->sdb))
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return PTR_ERR(rt1015p->sdb);
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dev_set_drvdata(&pdev->dev, rt1015p);
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return devm_snd_soc_register_component(&pdev->dev,
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&rt1015p_component_driver,
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&rt1015p_dai_driver, 1);
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}
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#ifdef CONFIG_OF
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static const struct of_device_id rt1015p_device_id[] = {
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{ .compatible = "realtek,rt1015p" },
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{}
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};
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MODULE_DEVICE_TABLE(of, rt1015p_device_id);
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#endif
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static struct platform_driver rt1015p_platform_driver = {
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.driver = {
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.name = "rt1015p",
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.of_match_table = of_match_ptr(rt1015p_device_id),
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},
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.probe = rt1015p_platform_probe,
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};
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module_platform_driver(rt1015p_platform_driver);
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MODULE_DESCRIPTION("ASoC RT1015P driver");
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MODULE_LICENSE("GPL v2");
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