LXR linux/sound/soc/qcom/storm.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   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 board
   6 */
   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                       4
  18
  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 = 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;
  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 by
  37         * the MAX98357a DAC, simply set the system clock to be a constant
  38         * multiple of the bit clock for the clock divider
  39         */
  40        sysclk_freq = rate * bitwidth * 2 * STORM_SYSCLK_MULT;
  41
  42        ret = snd_soc_dai_set_sysclk(soc_runtime->cpu_dai, 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
  56static struct snd_soc_dai_link storm_dai_link = {
  57        .name           = "Primary",
  58        .stream_name    = "Primary",
  59        .codec_dai_name = "HiFi",
  60        .ops            = &storm_soc_ops,
  61};
  62
  63static int storm_parse_of(struct snd_soc_card *card)
  64{
  65        struct snd_soc_dai_link *dai_link = card->dai_link;
  66        struct device_node *np = card->dev->of_node;
  67
  68        dai_link->cpu_of_node = of_parse_phandle(np, "cpu", 0);
  69        if (!dai_link->cpu_of_node) {
  70                dev_err(card->dev, "error getting cpu phandle\n");
  71                return -EINVAL;
  72        }
  73        dai_link->platform_of_node = dai_link->cpu_of_node;
  74
  75        dai_link->codec_of_node = of_parse_phandle(np, "codec", 0);
  76        if (!dai_link->codec_of_node) {
  77                dev_err(card->dev, "error getting codec phandle\n");
  78                return -EINVAL;
  79        }
  80
  81        return 0;
  82}
  83
  84static int storm_platform_probe(struct platform_device *pdev)
  85{
  86        struct snd_soc_card *card;
  87        int ret;
  88
  89        card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);
  90        if (!card)
  91                return -ENOMEM;
  92
  93        card->dev = &pdev->dev;
  94
  95        ret = snd_soc_of_parse_card_name(card, "qcom,model");
  96        if (ret) {
  97                dev_err(&pdev->dev, "error parsing card name: %d\n", ret);
  98                return ret;
  99        }
 100
 101        card->dai_link  = &storm_dai_link;
 102        card->num_links = 1;
 103
 104        ret = storm_parse_of(card);
 105        if (ret) {
 106                dev_err(&pdev->dev, "error resolving dai links: %d\n", ret);
 107                return ret;
 108        }
 109
 110        ret = devm_snd_soc_register_card(&pdev->dev, card);
 111        if (ret)
 112                dev_err(&pdev->dev, "error registering soundcard: %d\n", ret);
 113
 114        return ret;
 115
 116}
 117
 118#ifdef CONFIG_OF
 119static const struct of_device_id storm_device_id[]  = {
 120        { .compatible = "google,storm-audio" },
 121        {},
 122};
 123MODULE_DEVICE_TABLE(of, storm_device_id);
 124#endif
 125
 126static struct platform_driver storm_platform_driver = {
 127        .driver = {
 128                .name = "storm-audio",
 129                .of_match_table =
 130                        of_match_ptr(storm_device_id),
 131        },
 132        .probe = storm_platform_probe,
 133};
 134module_platform_driver(storm_platform_driver);
 135
 136MODULE_DESCRIPTION("QTi IPQ806x-based Storm Machine Driver");
 137MODULE_LICENSE("GPL v2");
 138