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         bool lpa;
  24 };
  25
  26 static struct dev_pm_ops lpa_pm;
  27
  28 static const struct snd_soc_dapm_widget imx_rpmsg_dapm_widgets[] = {
  29         SND_SOC_DAPM_HP("Headphone Jack", NULL),
  30         SND_SOC_DAPM_SPK("Ext Spk", NULL),
  31         SND_SOC_DAPM_MIC("Mic Jack", NULL),
  32         SND_SOC_DAPM_MIC("Main MIC", NULL),
  33 };
  34
  35 static int imx_rpmsg_late_probe(struct snd_soc_card *card)
  36 {
  37         struct imx_rpmsg *data = snd_soc_card_get_drvdata(card);
  38         struct snd_soc_pcm_runtime *rtd = list_first_entry(&card->rtd_list,
  39                                                            struct snd_soc_pcm_runtime, list);
  40         struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
  41         struct device *dev = card->dev;
  42         int ret;
  43
  44         if (data->lpa) {
  45                 struct snd_soc_component *codec_comp;
  46                 struct device_node *codec_np;
  47                 struct device_driver *codec_drv;
  48                 struct device *codec_dev = NULL;
  49
  50                 codec_np = data->dai.codecs->of_node;
  51                 if (codec_np) {
  52                         struct platform_device *codec_pdev;
  53                         struct i2c_client *codec_i2c;
  54
  55                         codec_i2c = of_find_i2c_device_by_node(codec_np);
  56                         if (codec_i2c)
  57                                 codec_dev = &codec_i2c->dev;
  58                         if (!codec_dev) {
  59                                 codec_pdev = of_find_device_by_node(codec_np);
  60                                 if (codec_pdev)
  61                                         codec_dev = &codec_pdev->dev;
  62                         }
  63                 }
  64                 if (codec_dev) {
  65                         codec_comp = snd_soc_lookup_component_nolocked(codec_dev, NULL);
  66                         if (codec_comp) {
  67                                 int i, num_widgets;
  68                                 const char *widgets;
  69                                 struct snd_soc_dapm_context *dapm;
  70
  71                                 num_widgets = of_property_count_strings(data->card.dev->of_node,
  72                                                                         "ignore-suspend-widgets");
  73                                 for (i = 0; i < num_widgets; i++) {
  74                                         of_property_read_string_index(data->card.dev->of_node,
  75                                                                       "ignore-suspend-widgets",
  76                                                                       i, &widgets);
  77                                         dapm = snd_soc_component_get_dapm(codec_comp);
  78                                         snd_soc_dapm_ignore_suspend(dapm, widgets);
  79                                 }
  80                         }
  81                         codec_drv = codec_dev->driver;
  82                         if (codec_drv->pm) {
  83                                 memcpy(&lpa_pm, codec_drv->pm, sizeof(lpa_pm));
  84                                 lpa_pm.suspend = NULL;
  85                                 lpa_pm.resume = NULL;
  86                                 lpa_pm.freeze = NULL;
  87                                 lpa_pm.thaw = NULL;
  88                                 lpa_pm.poweroff = NULL;
  89                                 lpa_pm.restore = NULL;
  90                                 codec_drv->pm = &lpa_pm;
  91                         }
  92                         put_device(codec_dev);
  93                 }
  94         }
  95
  96         if (!data->sysclk)
  97                 return 0;
  98
  99         ret = snd_soc_dai_set_sysclk(codec_dai, 0, data->sysclk, SND_SOC_CLOCK_IN);
 100         if (ret && ret != -ENOTSUPP) {
 101                 dev_err(dev, "failed to set sysclk in %s\n", __func__);
 102                 return ret;
 103         }
 104
 105         return 0;
 106 }
 107
 108 static int imx_rpmsg_probe(struct platform_device *pdev)
 109 {
 110         struct snd_soc_dai_link_component *dlc;
 111         struct device *dev = pdev->dev.parent;
 112         /* rpmsg_pdev is the platform device for the rpmsg node that probed us */
 113         struct platform_device *rpmsg_pdev = to_platform_device(dev);
 114         struct device_node *np = rpmsg_pdev->dev.of_node;
 115         struct of_phandle_args args;
 116         const char *platform_name;
 117         struct imx_rpmsg *data;
 118         int ret = 0;
 119
 120         dlc = devm_kzalloc(&pdev->dev, 3 * sizeof(*dlc), GFP_KERNEL);
 121         if (!dlc)
 122                 return -ENOMEM;
 123
 124         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 125         if (!data) {
 126                 ret = -ENOMEM;
 127                 goto fail;
 128         }
 129
 130         ret = of_reserved_mem_device_init_by_idx(&pdev->dev, np, 0);
 131         if (ret)
 132                 dev_warn(&pdev->dev, "no reserved DMA memory\n");
 133
 134         data->dai.cpus = &dlc[0];
 135         data->dai.num_cpus = 1;
 136         data->dai.platforms = &dlc[1];
 137         data->dai.num_platforms = 1;
 138         data->dai.codecs = &dlc[2];
 139         data->dai.num_codecs = 1;
 140
 141         data->dai.name = "rpmsg hifi";
 142         data->dai.stream_name = "rpmsg hifi";
 143         data->dai.dai_fmt = SND_SOC_DAIFMT_I2S |
 144                             SND_SOC_DAIFMT_NB_NF |
 145                             SND_SOC_DAIFMT_CBC_CFC;
 146
 147         /*
 148          * i.MX rpmsg sound cards work on codec slave mode. MCLK will be
 149          * disabled by CPU DAI driver in hw_free(). Some codec requires MCLK
 150          * present at power up/down sequence. So need to set ignore_pmdown_time
 151          * to power down codec immediately before MCLK is turned off.
 152          */
 153         data->dai.ignore_pmdown_time = 1;
 154
 155         /* Optional codec node */
 156         ret = of_parse_phandle_with_fixed_args(np, "audio-codec", 0, 0, &args);
 157         if (ret) {
 158                 *data->dai.codecs = snd_soc_dummy_dlc;
 159         } else {
 160                 struct clk *clk;
 161
 162                 ret = snd_soc_get_dlc(&args, data->dai.codecs);
 163                 if (ret) {
 164                         dev_err(&pdev->dev, "Unable to get codec_dai_name\n");
 165                         goto fail;
 166                 }
 167
 168                 clk = devm_get_clk_from_child(&pdev->dev, args.np, NULL);
 169                 if (!IS_ERR(clk))
 170                         data->sysclk = clk_get_rate(clk);
 171         }
 172
 173         data->dai.cpus->dai_name = dev_name(&rpmsg_pdev->dev);
 174         if (!of_property_read_string(np, "fsl,rpmsg-channel-name", &platform_name))
 175                 data->dai.platforms->name = platform_name;
 176         else
 177                 data->dai.platforms->name = "rpmsg-audio-channel";
 178         data->dai.playback_only = true;
 179         data->dai.capture_only = true;
 180         data->card.num_links = 1;
 181         data->card.dai_link = &data->dai;
 182
 183         if (of_property_read_bool(np, "fsl,rpmsg-out"))
 184                 data->dai.capture_only = false;
 185
 186         if (of_property_read_bool(np, "fsl,rpmsg-in"))
 187                 data->dai.playback_only = false;
 188
 189         if (data->dai.playback_only && data->dai.capture_only) {
 190                 dev_err(&pdev->dev, "no enabled rpmsg DAI link\n");
 191                 ret = -EINVAL;
 192                 goto fail;
 193         }
 194
 195         if (of_property_read_bool(np, "fsl,enable-lpa"))
 196                 data->lpa = true;
 197
 198         data->card.dev = &pdev->dev;
 199         data->card.owner = THIS_MODULE;
 200         data->card.dapm_widgets = imx_rpmsg_dapm_widgets;
 201         data->card.num_dapm_widgets = ARRAY_SIZE(imx_rpmsg_dapm_widgets);
 202         data->card.late_probe = imx_rpmsg_late_probe;
 203         /*
 204          * Inoder to use common api to get card name and audio routing.
 205          * Use parent of_node for this device, revert it after finishing using
 206          */
 207         data->card.dev->of_node = np;
 208
 209         ret = snd_soc_of_parse_card_name(&data->card, "model");
 210         if (ret)
 211                 goto fail;
 212
 213         if (of_property_read_bool(np, "audio-routing")) {
 214                 ret = snd_soc_of_parse_audio_routing(&data->card, "audio-routing");
 215                 if (ret) {
 216                         dev_err(&pdev->dev, "failed to parse audio-routing: %d\n", ret);
 217                         goto fail;
 218                 }
 219         }
 220
 221         platform_set_drvdata(pdev, &data->card);
 222         snd_soc_card_set_drvdata(&data->card, data);
 223         ret = devm_snd_soc_register_card(&pdev->dev, &data->card);
 224         if (ret) {
 225                 dev_err_probe(&pdev->dev, ret, "snd_soc_register_card failed\n");
 226                 goto fail;
 227         }
 228
 229 fail:
 230         pdev->dev.of_node = NULL;
 231         return ret;
 232 }
 233
 234 static struct platform_driver imx_rpmsg_driver = {
 235         .driver = {
 236                 .name = "imx-audio-rpmsg",
 237                 .pm = &snd_soc_pm_ops,
 238         },
 239         .probe = imx_rpmsg_probe,
 240 };
 241 module_platform_driver(imx_rpmsg_driver);
 242
 243 MODULE_DESCRIPTION("Freescale SoC Audio RPMSG Machine Driver");
 244 MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
 245 MODULE_ALIAS("platform:imx-audio-rpmsg");
 246 MODULE_LICENSE("GPL v2");