sound: Suppress error message about deferrals

[mirror_ubuntu-zesty-kernel.git] / sound / soc / bcm / hifiberry_amp.c

/*
 * ASoC Driver for HifiBerry AMP
 *
 * Author:	Sebastian Eickhoff <basti.eickhoff@googlemail.com>
 *		Copyright 2014
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */

#include <linux/module.h>
#include <linux/platform_device.h>

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

static int snd_rpi_hifiberry_amp_init(struct snd_soc_pcm_runtime *rtd)
{
	// ToDo: init of the dsp-registers.
	return 0;
}

static int snd_rpi_hifiberry_amp_hw_params( struct snd_pcm_substream *substream,
				       struct snd_pcm_hw_params *params )
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;

	return snd_soc_dai_set_bclk_ratio(cpu_dai, 64);
}

static struct snd_soc_ops snd_rpi_hifiberry_amp_ops = {
	.hw_params = snd_rpi_hifiberry_amp_hw_params,
};

static struct snd_soc_dai_link snd_rpi_hifiberry_amp_dai[] = {
    {
		.name			= "HifiBerry AMP",
		.stream_name	= "HifiBerry AMP HiFi",
		.cpu_dai_name	= "bcm2708-i2s.0",
		.codec_dai_name	= "tas5713-hifi",
		.platform_name	= "bcm2708-i2s.0",
		.codec_name		= "tas5713.1-001b",
		.dai_fmt		= SND_SOC_DAIFMT_I2S |
						  SND_SOC_DAIFMT_NB_NF |
						  SND_SOC_DAIFMT_CBS_CFS,
		.ops			= &snd_rpi_hifiberry_amp_ops,
		.init			= snd_rpi_hifiberry_amp_init,
	},
};


static struct snd_soc_card snd_rpi_hifiberry_amp = {
	.name         = "snd_rpi_hifiberry_amp",
	.driver_name  = "HifiberryAmp",
	.owner        = THIS_MODULE,
	.dai_link     = snd_rpi_hifiberry_amp_dai,
	.num_links    = ARRAY_SIZE(snd_rpi_hifiberry_amp_dai),
};

static const struct of_device_id snd_rpi_hifiberry_amp_of_match[] = {
        { .compatible = "hifiberry,hifiberry-amp", },
        {},
};
MODULE_DEVICE_TABLE(of, snd_rpi_hifiberry_amp_of_match);


static int snd_rpi_hifiberry_amp_probe(struct platform_device *pdev)
{
	int ret = 0;

	snd_rpi_hifiberry_amp.dev = &pdev->dev;

        if (pdev->dev.of_node) {
            struct device_node *i2s_node;
            struct snd_soc_dai_link *dai = &snd_rpi_hifiberry_amp_dai[0];
            i2s_node = of_parse_phandle(pdev->dev.of_node,
                                        "i2s-controller", 0);

            if (i2s_node) {
                dai->cpu_dai_name = NULL;
                dai->cpu_of_node = i2s_node;
                dai->platform_name = NULL;
                dai->platform_of_node = i2s_node;
            }
        }

	ret = snd_soc_register_card(&snd_rpi_hifiberry_amp);

	if (ret && ret != -EPROBE_DEFER)
		dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", ret);

	return ret;
}


static int snd_rpi_hifiberry_amp_remove(struct platform_device *pdev)
{
	return snd_soc_unregister_card(&snd_rpi_hifiberry_amp);
}


static struct platform_driver snd_rpi_hifiberry_amp_driver = {
        .driver = {
                .name   = "snd-hifiberry-amp",
                .owner  = THIS_MODULE,
		.of_match_table = snd_rpi_hifiberry_amp_of_match,
        },
        .probe          = snd_rpi_hifiberry_amp_probe,
        .remove         = snd_rpi_hifiberry_amp_remove,
};


module_platform_driver(snd_rpi_hifiberry_amp_driver);


MODULE_AUTHOR("Sebastian Eickhoff <basti.eickhoff@googlemail.com>");
MODULE_DESCRIPTION("ASoC driver for HiFiBerry-AMP");
MODULE_LICENSE("GPL v2");