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
  19 static 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
  52 static const struct snd_soc_ops storm_soc_ops = {
  53         .hw_params      = storm_ops_hw_params,
  54 };
  55
  56 static 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
  63 static 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
  84 static 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
 119 static const struct of_device_id storm_device_id[]  = {
 120         { .compatible = "google,storm-audio" },
 121         {},
 122 };
 123 MODULE_DEVICE_TABLE(of, storm_device_id);
 124 #endif
 125
 126 static 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 };
 134 module_platform_driver(storm_platform_driver);
 135
 136 MODULE_DESCRIPTION("QTi IPQ806x-based Storm Machine Driver");
 137 MODULE_LICENSE("GPL v2");