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
  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
 100        ret = snd_soc_of_parse_card_name(card, "qcom,model");
 101        if (ret) {
 102                dev_err(&pdev->dev, "error parsing card name: %d\n", ret);
 103                return ret;
 104        }
 105
 106        card->dai_link  = &storm_dai_link;
 107        card->num_links = 1;
 108
 109        ret = storm_parse_of(card);
 110        if (ret) {
 111                dev_err(&pdev->dev, "error resolving dai links: %d\n", ret);
 112                return ret;
 113        }
 114
 115        ret = devm_snd_soc_register_card(&pdev->dev, card);
 116        if (ret)
 117                dev_err(&pdev->dev, "error registering soundcard: %d\n", ret);
 118
 119        return ret;
 120
 121}
 122
 123#ifdef CONFIG_OF
 124static const struct of_device_id storm_device_id[]  = {
 125        { .compatible = "google,storm-audio" },
 126        {},
 127};
 128MODULE_DEVICE_TABLE(of, storm_device_id);
 129#endif
 130
 131static struct platform_driver storm_platform_driver = {
 132        .driver = {
 133                .name = "storm-audio",
 134                .of_match_table =
 135                        of_match_ptr(storm_device_id),
 136        },
 137        .probe = storm_platform_probe,
 138};
 139module_platform_driver(storm_platform_driver);
 140
 141MODULE_DESCRIPTION("QTi IPQ806x-based Storm Machine Driver");
 142MODULE_LICENSE("GPL v2");
 143