sound/soc/fsl/imx-mqs.c

   1 /*
   2  * Copyright 2012, 2014 Freescale Semiconductor, Inc.
   3  * Copyright 2012 Linaro Ltd.
   4  *
   5  * The code contained herein is licensed under the GNU General Public
   6  * License. You may obtain a copy of the GNU General Public License
   7  * Version 2 or later at the following locations:
   8  *
   9  * http://www.opensource.org/licenses/gpl-license.html
  10  * http://www.gnu.org/copyleft/gpl.html
  11  */
  12
  13 #include <linux/clk.h>
  14 #include <linux/module.h>
  15 #include <linux/of.h>
  16 #include <linux/of_platform.h>
  17 #include <sound/soc.h>
  18
  19 #define SUPPORT_RATE_NUM    10
  20
  21 struct imx_priv {
  22         unsigned int mclk_freq;
  23         struct platform_device *pdev;
  24 };
  25
  26 static struct imx_priv card_priv;
  27
  28 static int imx_mqs_startup(struct snd_pcm_substream *substream)
  29 {
  30         struct snd_pcm_runtime *runtime = substream->runtime;
  31         static struct snd_pcm_hw_constraint_list constraint_rates;
  32         struct imx_priv *priv = &card_priv;
  33         struct device *dev = &priv->pdev->dev;
  34         static u32 support_rates[SUPPORT_RATE_NUM];
  35         int ret;
  36
  37         if (priv->mclk_freq == 24576000) {
  38                 support_rates[0] = 48000;
  39                 support_rates[1] = 96000;
  40                 support_rates[2] = 192000;
  41                 constraint_rates.list = support_rates;
  42                 constraint_rates.count = 3;
  43
  44                 ret = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
  45                                                         &constraint_rates);
  46                 if (ret)
  47                         return ret;
  48         } else
  49                 dev_warn(dev, "mclk may be not supported %d\n", priv->mclk_freq);
  50
  51         return 0;
  52 }
  53
  54 static struct snd_soc_ops imx_mqs_ops = {
  55         .startup = imx_mqs_startup,
  56 };
  57
  58
  59
  60 static struct snd_soc_dai_link imx_mqs_dai = {
  61         .name = "HiFi",
  62         .stream_name = "HiFi",
  63         .dai_fmt = SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_NB_NF |
  64                 SND_SOC_DAIFMT_CBS_CFS,
  65         .ops = &imx_mqs_ops,
  66 };
  67
  68 static struct snd_soc_card snd_soc_card_imx_mqs = {
  69         .name = "mqs-audio",
  70         .dai_link = &imx_mqs_dai,
  71         .owner = THIS_MODULE,
  72         .num_links = 1,
  73 };
  74
  75 static int imx_mqs_probe(struct platform_device *pdev)
  76 {
  77         struct device_node *cpu_np, *codec_np;
  78         struct imx_priv *priv = &card_priv;
  79         struct clk *codec_clk = NULL;
  80         struct platform_device *codec_dev;
  81         int ret;
  82
  83         priv->pdev = pdev;
  84
  85         cpu_np = of_parse_phandle(pdev->dev.of_node, "cpu-dai", 0);
  86         if (!cpu_np) {
  87                 ret = -EINVAL;
  88                 goto fail;
  89         }
  90
  91         codec_np = of_parse_phandle(pdev->dev.of_node, "audio-codec", 0);
  92         if (!codec_np) {
  93                 dev_err(&pdev->dev, "phandle missing or invalid\n");
  94                 ret = -EINVAL;
  95                 goto fail;
  96         }
  97
  98         codec_dev = of_find_device_by_node(codec_np);
  99         if (!codec_dev) {
 100                 dev_err(&codec_dev->dev, "failed to find codec device\n");
 101                 ret = -EINVAL;
 102                 goto fail;
 103         }
 104
 105         codec_clk = devm_clk_get(&codec_dev->dev, NULL);
 106         if (IS_ERR(codec_clk)) {
 107                 ret = PTR_ERR(codec_clk);
 108                 dev_err(&codec_dev->dev, "failed to get codec clk: %d\n", ret);
 109                 goto fail;
 110         }
 111         priv->mclk_freq = clk_get_rate(codec_clk);
 112
 113
 114         imx_mqs_dai.cpu_of_node = cpu_np;
 115         imx_mqs_dai.platform_of_node = cpu_np;
 116         imx_mqs_dai.codec_dai_name = "fsl-mqs-dai";
 117         imx_mqs_dai.codec_of_node = codec_np;
 118         snd_soc_card_imx_mqs.dev = &pdev->dev;
 119
 120         ret = devm_snd_soc_register_card(&pdev->dev, &snd_soc_card_imx_mqs);
 121         if (ret) {
 122                 dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
 123                 goto fail;
 124         }
 125
 126 fail:
 127         if (cpu_np)
 128                 of_node_put(cpu_np);
 129
 130         return ret;
 131 }
 132
 133 static const struct of_device_id imx_mqs_dt_ids[] = {
 134         { .compatible = "fsl,imx-audio-mqs", },
 135         { /* sentinel */ }
 136 };
 137 MODULE_DEVICE_TABLE(of, imx_mqs_dt_ids);
 138
 139 static struct platform_driver imx_mqs_driver = {
 140         .driver = {
 141                 .name = "imx-mqs",
 142                 .owner = THIS_MODULE,
 143                 .of_match_table = imx_mqs_dt_ids,
 144         },
 145         .probe = imx_mqs_probe,
 146 };
 147 module_platform_driver(imx_mqs_driver);
 148
 149 MODULE_AUTHOR("Nicolin Chen <Guangyu.Chen@freescale.com>");
 150 MODULE_DESCRIPTION("Freescale i.MX MQS ASoC machine driver");
 151 MODULE_ALIAS("platform:imx-mqs");
 152 MODULE_LICENSE("GPL v2");