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