sound/soc/fsl/imx-rpmsg.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 // Copyright 2017-2020 NXP
   3
   4 #include <linux/module.h>
   5 #include <linux/of_platform.h>
   6 #include <linux/of_reserved_mem.h>
   7 #include <linux/i2c.h>
   8 #include <linux/of_gpio.h>
   9 #include <linux/slab.h>
  10 #include <linux/gpio.h>
  11 #include <linux/clk.h>
  12 #include <sound/soc.h>
  13 #include <sound/jack.h>
  14 #include <sound/control.h>
  15 #include <sound/pcm_params.h>
  16 #include <sound/soc-dapm.h>
  17 #include "imx-pcm-rpmsg.h"
  18
  19 struct imx_rpmsg {
  20         struct snd_soc_dai_link dai;
  21         struct snd_soc_card card;
  22         unsigned long sysclk;
  23 };
  24
  25 static const struct snd_soc_dapm_widget imx_rpmsg_dapm_widgets[] = {
  26         SND_SOC_DAPM_HP("Headphone Jack", NULL),
  27         SND_SOC_DAPM_SPK("Ext Spk", NULL),
  28         SND_SOC_DAPM_MIC("Mic Jack", NULL),
  29         SND_SOC_DAPM_MIC("Main MIC", NULL),
  30 };
  31
  32 static int imx_rpmsg_late_probe(struct snd_soc_card *card)
  33 {
  34         struct imx_rpmsg *data = snd_soc_card_get_drvdata(card);
  35         struct snd_soc_pcm_runtime *rtd = list_first_entry(&card->rtd_list,
  36                                                            struct snd_soc_pcm_runtime, list);
  37         struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
  38         struct device *dev = card->dev;
  39         int ret;
  40
  41         if (!data->sysclk)
  42                 return 0;
  43
  44         ret = snd_soc_dai_set_sysclk(codec_dai, 0, data->sysclk, SND_SOC_CLOCK_IN);
  45         if (ret && ret != -ENOTSUPP) {
  46                 dev_err(dev, "failed to set sysclk in %s\n", __func__);
  47                 return ret;
  48         }
  49
  50         return 0;
  51 }
  52
  53 static int imx_rpmsg_probe(struct platform_device *pdev)
  54 {
  55         struct snd_soc_dai_link_component *dlc;
  56         struct device *dev = pdev->dev.parent;
  57         /* rpmsg_pdev is the platform device for the rpmsg node that probed us */
  58         struct platform_device *rpmsg_pdev = to_platform_device(dev);
  59         struct device_node *np = rpmsg_pdev->dev.of_node;
  60         struct of_phandle_args args;
  61         const char *platform_name;
  62         struct imx_rpmsg *data;
  63         int ret = 0;
  64
  65         dlc = devm_kzalloc(&pdev->dev, 3 * sizeof(*dlc), GFP_KERNEL);
  66         if (!dlc)
  67                 return -ENOMEM;
  68
  69         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
  70         if (!data) {
  71                 ret = -ENOMEM;
  72                 goto fail;
  73         }
  74
  75         ret = of_reserved_mem_device_init_by_idx(&pdev->dev, np, 0);
  76         if (ret)
  77                 dev_warn(&pdev->dev, "no reserved DMA memory\n");
  78
  79         data->dai.cpus = &dlc[0];
  80         data->dai.num_cpus = 1;
  81         data->dai.platforms = &dlc[1];
  82         data->dai.num_platforms = 1;
  83         data->dai.codecs = &dlc[2];
  84         data->dai.num_codecs = 1;
  85
  86         data->dai.name = "rpmsg hifi";
  87         data->dai.stream_name = "rpmsg hifi";
  88         data->dai.dai_fmt = SND_SOC_DAIFMT_I2S |
  89                             SND_SOC_DAIFMT_NB_NF |
  90                             SND_SOC_DAIFMT_CBC_CFC;
  91
  92         /*
  93          * i.MX rpmsg sound cards work on codec slave mode. MCLK will be
  94          * disabled by CPU DAI driver in hw_free(). Some codec requires MCLK
  95          * present at power up/down sequence. So need to set ignore_pmdown_time
  96          * to power down codec immediately before MCLK is turned off.
  97          */
  98         data->dai.ignore_pmdown_time = 1;
  99
 100         /* Optional codec node */
 101         ret = of_parse_phandle_with_fixed_args(np, "audio-codec", 0, 0, &args);
 102         if (ret) {
 103                 *data->dai.codecs = asoc_dummy_dlc;
 104         } else {
 105                 struct clk *clk;
 106
 107                 ret = snd_soc_get_dlc(&args, data->dai.codecs);
 108                 if (ret) {
 109                         dev_err(&pdev->dev, "Unable to get codec_dai_name\n");
 110                         goto fail;
 111                 }
 112
 113                 clk = devm_get_clk_from_child(&pdev->dev, args.np, NULL);
 114                 if (!IS_ERR(clk))
 115                         data->sysclk = clk_get_rate(clk);
 116         }
 117
 118         data->dai.cpus->dai_name = dev_name(&rpmsg_pdev->dev);
 119         if (!of_property_read_string(np, "fsl,rpmsg-channel-name", &platform_name))
 120                 data->dai.platforms->name = platform_name;
 121         else
 122                 data->dai.platforms->name = "rpmsg-audio-channel";
 123         data->dai.playback_only = true;
 124         data->dai.capture_only = true;
 125         data->card.num_links = 1;
 126         data->card.dai_link = &data->dai;
 127
 128         if (of_property_read_bool(np, "fsl,rpmsg-out"))
 129                 data->dai.capture_only = false;
 130
 131         if (of_property_read_bool(np, "fsl,rpmsg-in"))
 132                 data->dai.playback_only = false;
 133
 134         if (data->dai.playback_only && data->dai.capture_only) {
 135                 dev_err(&pdev->dev, "no enabled rpmsg DAI link\n");
 136                 ret = -EINVAL;
 137                 goto fail;
 138         }
 139
 140         data->card.dev = &pdev->dev;
 141         data->card.owner = THIS_MODULE;
 142         data->card.dapm_widgets = imx_rpmsg_dapm_widgets;
 143         data->card.num_dapm_widgets = ARRAY_SIZE(imx_rpmsg_dapm_widgets);
 144         data->card.late_probe = imx_rpmsg_late_probe;
 145         /*
 146          * Inoder to use common api to get card name and audio routing.
 147          * Use parent of_node for this device, revert it after finishing using
 148          */
 149         data->card.dev->of_node = np;
 150
 151         ret = snd_soc_of_parse_card_name(&data->card, "model");
 152         if (ret)
 153                 goto fail;
 154
 155         if (of_property_read_bool(np, "audio-routing")) {
 156                 ret = snd_soc_of_parse_audio_routing(&data->card, "audio-routing");
 157                 if (ret) {
 158                         dev_err(&pdev->dev, "failed to parse audio-routing: %d\n", ret);
 159                         goto fail;
 160                 }
 161         }
 162
 163         platform_set_drvdata(pdev, &data->card);
 164         snd_soc_card_set_drvdata(&data->card, data);
 165         ret = devm_snd_soc_register_card(&pdev->dev, &data->card);
 166         if (ret) {
 167                 dev_err_probe(&pdev->dev, ret, "snd_soc_register_card failed\n");
 168                 goto fail;
 169         }
 170
 171 fail:
 172         pdev->dev.of_node = NULL;
 173         return ret;
 174 }
 175
 176 static struct platform_driver imx_rpmsg_driver = {
 177         .driver = {
 178                 .name = "imx-audio-rpmsg",
 179                 .pm = &snd_soc_pm_ops,
 180         },
 181         .probe = imx_rpmsg_probe,
 182 };
 183 module_platform_driver(imx_rpmsg_driver);
 184
 185 MODULE_DESCRIPTION("Freescale SoC Audio RPMSG Machine Driver");
 186 MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
 187 MODULE_ALIAS("platform:imx-audio-rpmsg");
 188 MODULE_LICENSE("GPL v2");