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