1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
5 * storm.c -- ALSA SoC machine driver for QTi ipq806x-based Storm board
8 #include <linux/device.h>
9 #include <linux/module.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>
17 #define STORM_SYSCLK_MULT 4
19 static int storm_ops_hw_params(struct snd_pcm_substream *substream,
20 struct snd_pcm_hw_params *params)
22 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
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;
29 bitwidth = snd_pcm_format_width(format);
31 dev_err(card->dev, "invalid bit width given: %d\n", bitwidth);
36 * as the CPU DAI is the I2S bus master and no system clock is needed by
37 * the MAX98357a DAC, simply set the system clock to be a constant
38 * multiple of the bit clock for the clock divider
40 sysclk_freq = rate * bitwidth * 2 * STORM_SYSCLK_MULT;
42 ret = snd_soc_dai_set_sysclk(soc_runtime->cpu_dai, 0, sysclk_freq, 0);
44 dev_err(card->dev, "error setting sysclk to %u: %d\n",
52 static const struct snd_soc_ops storm_soc_ops = {
53 .hw_params = storm_ops_hw_params,
56 SND_SOC_DAILINK_DEFS(hifi,
57 DAILINK_COMP_ARRAY(COMP_EMPTY()),
58 DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "HiFi")),
59 DAILINK_COMP_ARRAY(COMP_EMPTY()));
61 static struct snd_soc_dai_link storm_dai_link = {
63 .stream_name = "Primary",
64 .ops = &storm_soc_ops,
65 SND_SOC_DAILINK_REG(hifi),
68 static int storm_parse_of(struct snd_soc_card *card)
70 struct snd_soc_dai_link *dai_link = card->dai_link;
71 struct device_node *np = card->dev->of_node;
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");
78 dai_link->platforms->of_node = dai_link->cpus->of_node;
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");
89 static int storm_platform_probe(struct platform_device *pdev)
91 struct snd_soc_card *card;
94 card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);
98 card->dev = &pdev->dev;
100 ret = snd_soc_of_parse_card_name(card, "qcom,model");
102 dev_err(&pdev->dev, "error parsing card name: %d\n", ret);
106 card->dai_link = &storm_dai_link;
109 ret = storm_parse_of(card);
111 dev_err(&pdev->dev, "error resolving dai links: %d\n", ret);
115 ret = devm_snd_soc_register_card(&pdev->dev, card);
117 dev_err(&pdev->dev, "error registering soundcard: %d\n", ret);
124 static const struct of_device_id storm_device_id[] = {
125 { .compatible = "google,storm-audio" },
128 MODULE_DEVICE_TABLE(of, storm_device_id);
131 static struct platform_driver storm_platform_driver = {
133 .name = "storm-audio",
135 of_match_ptr(storm_device_id),
137 .probe = storm_platform_probe,
139 module_platform_driver(storm_platform_driver);
141 MODULE_DESCRIPTION("QTi IPQ806x-based Storm Machine Driver");
142 MODULE_LICENSE("GPL v2");