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/*
* Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only 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.
*
* storm.c -- ALSA SoC machine driver for QTi ipq806x-based Storm board
*/
#include <linux/device.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#define STORM_SYSCLK_MULT 4
static int storm_ops_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
struct snd_soc_card *card = soc_runtime->card;
snd_pcm_format_t format = params_format(params);
unsigned int rate = params_rate(params);
unsigned int sysclk_freq;
int bitwidth, ret;
bitwidth = snd_pcm_format_width(format);
if (bitwidth < 0) {
dev_err(card->dev, "invalid bit width given: %d\n", bitwidth);
return bitwidth;
}
/*
* as the CPU DAI is the I2S bus master and no system clock is needed by
* the MAX98357a DAC, simply set the system clock to be a constant
* multiple of the bit clock for the clock divider
*/
sysclk_freq = rate * bitwidth * 2 * STORM_SYSCLK_MULT;
ret = snd_soc_dai_set_sysclk(soc_runtime->cpu_dai, 0, sysclk_freq, 0);
if (ret) {
dev_err(card->dev, "error setting sysclk to %u: %d\n",
sysclk_freq, ret);
return ret;
}
return 0;
}
static const struct snd_soc_ops storm_soc_ops = {
.hw_params = storm_ops_hw_params,
};
static struct snd_soc_dai_link storm_dai_link = {
.name = "Primary",
.stream_name = "Primary",
.codec_dai_name = "HiFi",
.ops = &storm_soc_ops,
};
static int storm_parse_of(struct snd_soc_card *card)
{
struct snd_soc_dai_link *dai_link = card->dai_link;
struct device_node *np = card->dev->of_node;
dai_link->cpu_of_node = of_parse_phandle(np, "cpu", 0);
if (!dai_link->cpu_of_node) {
dev_err(card->dev, "error getting cpu phandle\n");
return -EINVAL;
}
dai_link->platform_of_node = dai_link->cpu_of_node;
dai_link->codec_of_node = of_parse_phandle(np, "codec", 0);
if (!dai_link->codec_of_node) {
dev_err(card->dev, "error getting codec phandle\n");
return -EINVAL;
}
return 0;
}
static int storm_platform_probe(struct platform_device *pdev)
{
struct snd_soc_card *card;
int ret;
card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);
if (!card)
return -ENOMEM;
card->dev = &pdev->dev;
platform_set_drvdata(pdev, card);
ret = snd_soc_of_parse_card_name(card, "qcom,model");
if (ret) {
dev_err(&pdev->dev, "error parsing card name: %d\n", ret);
return ret;
}
card->dai_link = &storm_dai_link;
card->num_links = 1;
ret = storm_parse_of(card);
if (ret) {
dev_err(&pdev->dev, "error resolving dai links: %d\n", ret);
return ret;
}
ret = devm_snd_soc_register_card(&pdev->dev, card);
if (ret)
dev_err(&pdev->dev, "error registering soundcard: %d\n", ret);
return ret;
}
#ifdef CONFIG_OF
static const struct of_device_id storm_device_id[] = {
{ .compatible = "google,storm-audio" },
{},
};
MODULE_DEVICE_TABLE(of, storm_device_id);
#endif
static struct platform_driver storm_platform_driver = {
.driver = {
.name = "storm-audio",
.of_match_table =
of_match_ptr(storm_device_id),
},
.probe = storm_platform_probe,
};
module_platform_driver(storm_platform_driver);
MODULE_DESCRIPTION("QTi IPQ806x-based Storm Machine Driver");
MODULE_LICENSE("GPL v2");
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