5edf1e0692
Since 39b2bbe3d7 (gpio: add flags argument to gpiod_get*() functions)
which appeared in v3.17-rc1, the gpiod_get* functions take an additional
parameter that allows to specify direction and initial value for output.
Use this to simplify the driver. Furthermore this is one caller less
that stops us making the flags argument to gpiod_get*() mandatory.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Kenneth Westfield <kwestfie@codeaurora.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
144 lines
3.8 KiB
C
144 lines
3.8 KiB
C
/* Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* max98357a.c -- MAX98357A ALSA SoC Codec driver
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*/
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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/mod_devicetable.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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static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,
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int cmd, struct snd_soc_dai *dai)
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{
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struct gpio_desc *sdmode = snd_soc_dai_get_drvdata(dai);
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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gpiod_set_value(sdmode, 1);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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gpiod_set_value(sdmode, 0);
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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 max98357a_dapm_widgets[] = {
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SND_SOC_DAPM_DAC("SDMode", NULL, SND_SOC_NOPM, 0, 0),
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SND_SOC_DAPM_OUTPUT("Speaker"),
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};
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static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
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{"Speaker", NULL, "SDMode"},
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};
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static int max98357a_codec_probe(struct snd_soc_codec *codec)
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{
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struct gpio_desc *sdmode;
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sdmode = devm_gpiod_get(codec->dev, "sdmode", GPIOD_OUT_LOW);
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if (IS_ERR(sdmode)) {
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dev_err(codec->dev, "%s() unable to get sdmode GPIO: %ld\n",
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__func__, PTR_ERR(sdmode));
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return PTR_ERR(sdmode);
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}
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snd_soc_codec_set_drvdata(codec, sdmode);
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return 0;
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}
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static struct snd_soc_codec_driver max98357a_codec_driver = {
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.probe = max98357a_codec_probe,
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.dapm_widgets = max98357a_dapm_widgets,
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.num_dapm_widgets = ARRAY_SIZE(max98357a_dapm_widgets),
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.dapm_routes = max98357a_dapm_routes,
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.num_dapm_routes = ARRAY_SIZE(max98357a_dapm_routes),
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};
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static struct snd_soc_dai_ops max98357a_dai_ops = {
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.trigger = max98357a_daiops_trigger,
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};
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static struct snd_soc_dai_driver max98357a_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_S16 |
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SNDRV_PCM_FMTBIT_S24 |
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SNDRV_PCM_FMTBIT_S32,
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.rates = SNDRV_PCM_RATE_8000 |
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SNDRV_PCM_RATE_16000 |
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SNDRV_PCM_RATE_48000 |
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SNDRV_PCM_RATE_96000,
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.rate_min = 8000,
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.rate_max = 96000,
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.channels_min = 1,
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.channels_max = 2,
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},
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.ops = &max98357a_dai_ops,
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};
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static int max98357a_platform_probe(struct platform_device *pdev)
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{
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int ret;
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ret = snd_soc_register_codec(&pdev->dev, &max98357a_codec_driver,
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&max98357a_dai_driver, 1);
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if (ret)
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dev_err(&pdev->dev, "%s() error registering codec driver: %d\n",
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__func__, ret);
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return ret;
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}
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static int max98357a_platform_remove(struct platform_device *pdev)
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{
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snd_soc_unregister_codec(&pdev->dev);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id max98357a_device_id[] = {
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{ .compatible = "maxim,max98357a" },
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{}
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};
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MODULE_DEVICE_TABLE(of, max98357a_device_id);
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#endif
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static struct platform_driver max98357a_platform_driver = {
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.driver = {
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.name = "max98357a",
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.of_match_table = of_match_ptr(max98357a_device_id),
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},
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.probe = max98357a_platform_probe,
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.remove = max98357a_platform_remove,
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};
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module_platform_driver(max98357a_platform_driver);
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MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
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MODULE_LICENSE("GPL v2");
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