drivers/sound/samsung_sound.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2018 Google, LLC
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6
   7 #include <common.h>
   8 #include <audio_codec.h>
   9 #include <dm.h>
  10 #include <i2s.h>
  11 #include <sound.h>
  12 #include <asm/gpio.h>
  13
  14 static int samsung_sound_setup(struct udevice *dev)
  15 {
  16         struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev);
  17         struct i2s_uc_priv *i2c_priv = dev_get_uclass_priv(uc_priv->i2s);
  18         int ret;
  19
  20         if (uc_priv->setup_done)
  21                 return -EALREADY;
  22         ret = audio_codec_set_params(uc_priv->codec, i2c_priv->id,
  23                                      i2c_priv->samplingrate,
  24                                      i2c_priv->samplingrate * i2c_priv->rfs,
  25                                      i2c_priv->bitspersample,
  26                                      i2c_priv->channels);
  27         if (ret)
  28                 return ret;
  29         uc_priv->setup_done = true;
  30
  31         return 0;
  32 }
  33
  34 static int samsung_sound_play(struct udevice *dev, void *data, uint data_size)
  35 {
  36         struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev);
  37
  38         return i2s_tx_data(uc_priv->i2s, data, data_size);
  39 }
  40
  41 static int samsung_sound_probe(struct udevice *dev)
  42 {
  43         struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev);
  44         struct ofnode_phandle_args args;
  45         struct gpio_desc en_gpio;
  46         ofnode node;
  47         int ret;
  48
  49         ret = gpio_request_by_name(dev, "codec-enable-gpio", 0, &en_gpio,
  50                                    GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
  51
  52         /* Turn on the GPIO which connects to the codec's "enable" line. */
  53         if (!ret)
  54                 gpio_set_pull(gpio_get_number(&en_gpio), S5P_GPIO_PULL_NONE);
  55
  56         ret = uclass_get_device_by_phandle(UCLASS_AUDIO_CODEC, dev,
  57                                            "samsung,audio-codec",
  58                                            &uc_priv->codec);
  59         if (ret) {
  60                 debug("Failed to probe audio codec\n");
  61                 return ret;
  62         }
  63         node = ofnode_find_subnode(dev_ofnode(dev), "cpu");
  64         if (!ofnode_valid(node)) {
  65                 debug("Failed to find /cpu subnode\n");
  66                 return -EINVAL;
  67         }
  68         ret = ofnode_parse_phandle_with_args(node, "sound-dai",
  69                                              "#sound-dai-cells", 0, 0, &args);
  70         if (ret) {
  71                 debug("Cannot find phandle: %d\n", ret);
  72                 return ret;
  73         }
  74         ret = uclass_get_device_by_ofnode(UCLASS_I2S, args.node, &uc_priv->i2s);
  75         if (ret) {
  76                 debug("Cannot find i2s: %d\n", ret);
  77                 return ret;
  78         }
  79         debug("Probed sound '%s' with codec '%s' and i2s '%s'\n", dev->name,
  80               uc_priv->codec->name, uc_priv->i2s->name);
  81
  82         return 0;
  83 }
  84
  85 static const struct sound_ops samsung_sound_ops = {
  86         .setup  = samsung_sound_setup,
  87         .play   = samsung_sound_play,
  88 };
  89
  90 static const struct udevice_id samsung_sound_ids[] = {
  91         { .compatible = "google,snow-audio-max98095" },
  92         { }
  93 };
  94
  95 U_BOOT_DRIVER(samsung_sound) = {
  96         .name           = "samsung_sound",
  97         .id             = UCLASS_SOUND,
  98         .of_match       = samsung_sound_ids,
  99         .probe          = samsung_sound_probe,
 100         .ops            = &samsung_sound_ops,
 101 };