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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.4 *5 * storm.c -- ALSA SoC machine driver for QTi ipq806x-based Storm board6 */7 8#include <linux/device.h>9#include <linux/module.h>10#include <linux/of.h>11#include <linux/mod_devicetable.h>12#include <linux/platform_device.h>13#include <sound/pcm.h>14#include <sound/pcm_params.h>15#include <sound/soc.h>16 17#define STORM_SYSCLK_MULT 418 19static int storm_ops_hw_params(struct snd_pcm_substream *substream,20 struct snd_pcm_hw_params *params)21{22 struct snd_soc_pcm_runtime *soc_runtime = snd_soc_substream_to_rtd(substream);23 struct snd_soc_card *card = soc_runtime->card;24 snd_pcm_format_t format = params_format(params);25 unsigned int rate = params_rate(params);26 unsigned int sysclk_freq;27 int bitwidth, ret;28 29 bitwidth = snd_pcm_format_width(format);30 if (bitwidth < 0) {31 dev_err(card->dev, "invalid bit width given: %d\n", bitwidth);32 return bitwidth;33 }34 35 /*36 * as the CPU DAI is the I2S bus master and no system clock is needed by37 * the MAX98357a DAC, simply set the system clock to be a constant38 * multiple of the bit clock for the clock divider39 */40 sysclk_freq = rate * bitwidth * 2 * STORM_SYSCLK_MULT;41 42 ret = snd_soc_dai_set_sysclk(snd_soc_rtd_to_cpu(soc_runtime, 0), 0, sysclk_freq, 0);43 if (ret) {44 dev_err(card->dev, "error setting sysclk to %u: %d\n",45 sysclk_freq, ret);46 return ret;47 }48 49 return 0;50}51 52static const struct snd_soc_ops storm_soc_ops = {53 .hw_params = storm_ops_hw_params,54};55 56SND_SOC_DAILINK_DEFS(hifi,57 DAILINK_COMP_ARRAY(COMP_EMPTY()),58 DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "HiFi")),59 DAILINK_COMP_ARRAY(COMP_EMPTY()));60 61static struct snd_soc_dai_link storm_dai_link = {62 .name = "Primary",63 .stream_name = "Primary",64 .ops = &storm_soc_ops,65 SND_SOC_DAILINK_REG(hifi),66};67 68static int storm_parse_of(struct snd_soc_card *card)69{70 struct snd_soc_dai_link *dai_link = card->dai_link;71 struct device_node *np = card->dev->of_node;72 73 dai_link->cpus->of_node = of_parse_phandle(np, "cpu", 0);74 if (!dai_link->cpus->of_node) {75 dev_err(card->dev, "error getting cpu phandle\n");76 return -EINVAL;77 }78 dai_link->platforms->of_node = dai_link->cpus->of_node;79 80 dai_link->codecs->of_node = of_parse_phandle(np, "codec", 0);81 if (!dai_link->codecs->of_node) {82 dev_err(card->dev, "error getting codec phandle\n");83 return -EINVAL;84 }85 86 return 0;87}88 89static int storm_platform_probe(struct platform_device *pdev)90{91 struct snd_soc_card *card;92 int ret;93 94 card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);95 if (!card)96 return -ENOMEM;97 98 card->dev = &pdev->dev;99 card->owner = THIS_MODULE;100 101 ret = snd_soc_of_parse_card_name(card, "qcom,model");102 if (ret) {103 dev_err(&pdev->dev, "error parsing card name: %d\n", ret);104 return ret;105 }106 107 card->dai_link = &storm_dai_link;108 card->num_links = 1;109 110 ret = storm_parse_of(card);111 if (ret) {112 dev_err(&pdev->dev, "error resolving dai links: %d\n", ret);113 return ret;114 }115 116 ret = devm_snd_soc_register_card(&pdev->dev, card);117 if (ret)118 dev_err(&pdev->dev, "error registering soundcard: %d\n", ret);119 120 return ret;121 122}123 124#ifdef CONFIG_OF125static const struct of_device_id storm_device_id[] = {126 { .compatible = "google,storm-audio" },127 {},128};129MODULE_DEVICE_TABLE(of, storm_device_id);130#endif131 132static struct platform_driver storm_platform_driver = {133 .driver = {134 .name = "storm-audio",135 .of_match_table =136 of_match_ptr(storm_device_id),137 },138 .probe = storm_platform_probe,139};140module_platform_driver(storm_platform_driver);141 142MODULE_DESCRIPTION("QTi IPQ806x-based Storm Machine Driver");143MODULE_LICENSE("GPL");144