2 * Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 and
6 * only version 2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * storm.c -- ALSA SoC machine driver for QTi ipq806x-based Storm board
16 #include <linux/device.h>
17 #include <linux/module.h>
19 #include <linux/mod_devicetable.h>
20 #include <linux/platform_device.h>
21 #include <sound/pcm.h>
22 #include <sound/pcm_params.h>
23 #include <sound/soc.h>
25 #define STORM_SYSCLK_MULT 4
27 static int storm_ops_hw_params(struct snd_pcm_substream *substream,
28 struct snd_pcm_hw_params *params)
30 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
31 struct snd_soc_card *card = soc_runtime->card;
32 snd_pcm_format_t format = params_format(params);
33 unsigned int rate = params_rate(params);
34 unsigned int sysclk_freq;
37 bitwidth = snd_pcm_format_width(format);
39 dev_err(card->dev, "invalid bit width given: %d\n", bitwidth);
44 * as the CPU DAI is the I2S bus master and no system clock is needed by
45 * the MAX98357a DAC, simply set the system clock to be a constant
46 * multiple of the bit clock for the clock divider
48 sysclk_freq = rate * bitwidth * 2 * STORM_SYSCLK_MULT;
50 ret = snd_soc_dai_set_sysclk(soc_runtime->cpu_dai, 0, sysclk_freq, 0);
52 dev_err(card->dev, "error setting sysclk to %u: %d\n",
60 static const struct snd_soc_ops storm_soc_ops = {
61 .hw_params = storm_ops_hw_params,
64 SND_SOC_DAILINK_DEFS(hifi,
65 DAILINK_COMP_ARRAY(COMP_EMPTY()),
66 DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "HiFi")),
67 DAILINK_COMP_ARRAY(COMP_EMPTY()));
69 static struct snd_soc_dai_link storm_dai_link = {
71 .stream_name = "Primary",
72 .ops = &storm_soc_ops,
73 SND_SOC_DAILINK_REG(hifi),
76 static int storm_parse_of(struct snd_soc_card *card)
78 struct snd_soc_dai_link *dai_link = card->dai_link;
79 struct device_node *np = card->dev->of_node;
81 dai_link->cpus->of_node = of_parse_phandle(np, "cpu", 0);
82 if (!dai_link->cpus->of_node) {
83 dev_err(card->dev, "error getting cpu phandle\n");
86 dai_link->platforms->of_node = dai_link->cpus->of_node;
88 dai_link->codecs->of_node = of_parse_phandle(np, "codec", 0);
89 if (!dai_link->codecs->of_node) {
90 dev_err(card->dev, "error getting codec phandle\n");
97 static int storm_platform_probe(struct platform_device *pdev)
99 struct snd_soc_card *card;
102 card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);
106 card->dev = &pdev->dev;
108 ret = snd_soc_of_parse_card_name(card, "qcom,model");
110 dev_err(&pdev->dev, "error parsing card name: %d\n", ret);
114 card->dai_link = &storm_dai_link;
117 ret = storm_parse_of(card);
119 dev_err(&pdev->dev, "error resolving dai links: %d\n", ret);
123 ret = devm_snd_soc_register_card(&pdev->dev, card);
125 dev_err(&pdev->dev, "error registering soundcard: %d\n", ret);
132 static const struct of_device_id storm_device_id[] = {
133 { .compatible = "google,storm-audio" },
136 MODULE_DEVICE_TABLE(of, storm_device_id);
139 static struct platform_driver storm_platform_driver = {
141 .name = "storm-audio",
143 of_match_ptr(storm_device_id),
145 .probe = storm_platform_probe,
147 module_platform_driver(storm_platform_driver);
149 MODULE_DESCRIPTION("QTi IPQ806x-based Storm Machine Driver");
150 MODULE_LICENSE("GPL v2");