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/slab.h>
   9 #include <linux/clk.h>
  10 #include <sound/soc.h>
  11 #include <sound/jack.h>
  12 #include <sound/control.h>
  13 #include <sound/pcm_params.h>
  14 #include <sound/soc-dapm.h>
  15 #include "imx-pcm-rpmsg.h"
  16
  17 struct imx_rpmsg {
  18         struct snd_soc_dai_link dai;
  19         struct snd_soc_card card;
  20         unsigned long sysclk;
  21         bool lpa;
  22 };
  23
  24 static struct dev_pm_ops lpa_pm;
  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->lpa) {
  43                 struct snd_soc_component *codec_comp;
  44                 struct device_node *codec_np;
  45                 struct device_driver *codec_drv;
  46                 struct device *codec_dev = NULL;
  47
  48                 codec_np = data->dai.codecs->of_node;
  49                 if (codec_np) {
  50                         struct platform_device *codec_pdev;
  51                         struct i2c_client *codec_i2c;
  52
  53                         codec_i2c = of_find_i2c_device_by_node(codec_np);
  54                         if (codec_i2c)
  55                                 codec_dev = &codec_i2c->dev;
  56                         if (!codec_dev) {
  57                                 codec_pdev = of_find_device_by_node(codec_np);
  58                                 if (codec_pdev)
  59                                         codec_dev = &codec_pdev->dev;
  60                         }
  61                 }
  62                 if (codec_dev) {
  63                         codec_comp = snd_soc_lookup_component_nolocked(codec_dev, NULL);
  64                         if (codec_comp) {
  65                                 int i, num_widgets;
  66                                 const char *widgets;
  67                                 struct snd_soc_dapm_context *dapm;
  68
  69                                 num_widgets = of_property_count_strings(data->card.dev->of_node,
  70                                                                         "ignore-suspend-widgets");
  71                                 for (i = 0; i < num_widgets; i++) {
  72                                         of_property_read_string_index(data->card.dev->of_node,
  73                                                                       "ignore-suspend-widgets",
  74                                                                       i, &widgets);
  75                                         dapm = snd_soc_component_get_dapm(codec_comp);
  76                                         snd_soc_dapm_ignore_suspend(dapm, widgets);
  77                                 }
  78                         }
  79                         codec_drv = codec_dev->driver;
  80                         if (codec_drv->pm) {
  81                                 memcpy(&lpa_pm, codec_drv->pm, sizeof(lpa_pm));
  82                                 lpa_pm.suspend = NULL;
  83                                 lpa_pm.resume = NULL;
  84                                 lpa_pm.freeze = NULL;
  85                                 lpa_pm.thaw = NULL;
  86                                 lpa_pm.poweroff = NULL;
  87                                 lpa_pm.restore = NULL;
  88                                 codec_drv->pm = &lpa_pm;
  89                         }
  90                         put_device(codec_dev);
  91                 }
  92         }
  93
  94         if (!data->sysclk)
  95                 return 0;
  96
  97         ret = snd_soc_dai_set_sysclk(codec_dai, 0, data->sysclk, SND_SOC_CLOCK_IN);
  98         if (ret && ret != -ENOTSUPP) {
  99                 dev_err(dev, "failed to set sysclk in %s\n", __func__);
 100                 return ret;
 101         }
 102
 103         return 0;
 104 }
 105
 106 static int imx_rpmsg_probe(struct platform_device *pdev)
 107 {
 108         struct snd_soc_dai_link_component *dlc;
 109         struct snd_soc_dai *cpu_dai;
 110         struct device_node *np = NULL;
 111         struct of_phandle_args args;
 112         const char *platform_name;
 113         struct imx_rpmsg *data;
 114         int ret = 0;
 115
 116         dlc = devm_kzalloc(&pdev->dev, 3 * sizeof(*dlc), GFP_KERNEL);
 117         if (!dlc)
 118                 return -ENOMEM;
 119
 120         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 121         if (!data) {
 122                 ret = -ENOMEM;
 123                 goto fail;
 124         }
 125
 126         data->dai.cpus = &dlc[0];
 127         data->dai.num_cpus = 1;
 128         data->dai.platforms = &dlc[1];
 129         data->dai.num_platforms = 1;
 130         data->dai.codecs = &dlc[2];
 131         data->dai.num_codecs = 1;
 132
 133         data->dai.name = "rpmsg hifi";
 134         data->dai.stream_name = "rpmsg hifi";
 135         data->dai.dai_fmt = SND_SOC_DAIFMT_I2S |
 136                             SND_SOC_DAIFMT_NB_NF |
 137                             SND_SOC_DAIFMT_CBC_CFC;
 138
 139         /*
 140          * i.MX rpmsg sound cards work on codec slave mode. MCLK will be
 141          * disabled by CPU DAI driver in hw_free(). Some codec requires MCLK
 142          * present at power up/down sequence. So need to set ignore_pmdown_time
 143          * to power down codec immediately before MCLK is turned off.
 144          */
 145         data->dai.ignore_pmdown_time = 1;
 146
 147         data->dai.cpus->dai_name = pdev->dev.platform_data;
 148         cpu_dai = snd_soc_find_dai(data->dai.cpus);
 149         if (!cpu_dai) {
 150                 ret = -EPROBE_DEFER;
 151                 goto fail;
 152         }
 153         np = cpu_dai->dev->of_node;
 154         if (!np) {
 155                 dev_err(&pdev->dev, "failed to parse CPU DAI device node\n");
 156                 ret = -ENODEV;
 157                 goto fail;
 158         }
 159
 160         ret = of_reserved_mem_device_init_by_idx(&pdev->dev, np, 0);
 161         if (ret)
 162                 dev_warn(&pdev->dev, "no reserved DMA memory\n");
 163
 164         /* Optional codec node */
 165         ret = of_parse_phandle_with_fixed_args(np, "audio-codec", 0, 0, &args);
 166         if (ret) {
 167                 *data->dai.codecs = snd_soc_dummy_dlc;
 168         } else {
 169                 struct clk *clk;
 170
 171                 ret = snd_soc_get_dlc(&args, data->dai.codecs);
 172                 if (ret) {
 173                         dev_err(&pdev->dev, "Unable to get codec_dai_name\n");
 174                         goto fail;
 175                 }
 176
 177                 clk = devm_get_clk_from_child(&pdev->dev, args.np, NULL);
 178                 if (!IS_ERR(clk))
 179                         data->sysclk = clk_get_rate(clk);
 180         }
 181
 182         if (!of_property_read_string(np, "fsl,rpmsg-channel-name", &platform_name))
 183                 data->dai.platforms->name = platform_name;
 184         else
 185                 data->dai.platforms->name = "rpmsg-audio-channel";
 186         data->dai.playback_only = true;
 187         data->dai.capture_only = true;
 188         data->card.num_links = 1;
 189         data->card.dai_link = &data->dai;
 190
 191         if (of_property_read_bool(np, "fsl,rpmsg-out"))
 192                 data->dai.capture_only = false;
 193
 194         if (of_property_read_bool(np, "fsl,rpmsg-in"))
 195                 data->dai.playback_only = false;
 196
 197         if (data->dai.playback_only && data->dai.capture_only) {
 198                 dev_err(&pdev->dev, "no enabled rpmsg DAI link\n");
 199                 ret = -EINVAL;
 200                 goto fail;
 201         }
 202
 203         if (of_property_read_bool(np, "fsl,enable-lpa"))
 204                 data->lpa = true;
 205
 206         data->card.dev = &pdev->dev;
 207         data->card.owner = THIS_MODULE;
 208         data->card.dapm_widgets = imx_rpmsg_dapm_widgets;
 209         data->card.num_dapm_widgets = ARRAY_SIZE(imx_rpmsg_dapm_widgets);
 210         data->card.late_probe = imx_rpmsg_late_probe;
 211         /*
 212          * Inoder to use common api to get card name and audio routing.
 213          * Use parent of_node for this device, revert it after finishing using
 214          */
 215         data->card.dev->of_node = np;
 216
 217         ret = snd_soc_of_parse_card_name(&data->card, "model");
 218         if (ret)
 219                 goto fail;
 220
 221         if (of_property_read_bool(np, "audio-routing")) {
 222                 ret = snd_soc_of_parse_audio_routing(&data->card, "audio-routing");
 223                 if (ret) {
 224                         dev_err(&pdev->dev, "failed to parse audio-routing: %d\n", ret);
 225                         goto fail;
 226                 }
 227         }
 228
 229         platform_set_drvdata(pdev, &data->card);
 230         snd_soc_card_set_drvdata(&data->card, data);
 231         ret = devm_snd_soc_register_card(&pdev->dev, &data->card);
 232         if (ret) {
 233                 dev_err_probe(&pdev->dev, ret, "snd_soc_register_card failed\n");
 234                 goto fail;
 235         }
 236
 237 fail:
 238         pdev->dev.of_node = NULL;
 239         return ret;
 240 }
 241
 242 static struct platform_driver imx_rpmsg_driver = {
 243         .driver = {
 244                 .name = "imx-audio-rpmsg",
 245                 .pm = &snd_soc_pm_ops,
 246         },
 247         .probe = imx_rpmsg_probe,
 248 };
 249 module_platform_driver(imx_rpmsg_driver);
 250
 251 MODULE_DESCRIPTION("Freescale SoC Audio RPMSG Machine Driver");
 252 MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
 253 MODULE_ALIAS("platform:imx-audio-rpmsg");
 254 MODULE_LICENSE("GPL v2");