diff options
Diffstat (limited to 'drivers/sound/samsung_sound.c')
-rw-r--r-- | drivers/sound/samsung_sound.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/drivers/sound/samsung_sound.c b/drivers/sound/samsung_sound.c new file mode 100644 index 0000000..23b467c --- /dev/null +++ b/drivers/sound/samsung_sound.c @@ -0,0 +1,101 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright 2018 Google, LLC + * Written by Simon Glass <sjg@chromium.org> + */ + +#include <common.h> +#include <audio_codec.h> +#include <dm.h> +#include <i2s.h> +#include <sound.h> +#include <asm/gpio.h> + +static int samsung_sound_setup(struct udevice *dev) +{ + struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev); + struct i2s_uc_priv *i2c_priv = dev_get_uclass_priv(uc_priv->i2s); + int ret; + + if (uc_priv->setup_done) + return -EALREADY; + ret = audio_codec_set_params(uc_priv->codec, i2c_priv->id, + i2c_priv->samplingrate, + i2c_priv->samplingrate * i2c_priv->rfs, + i2c_priv->bitspersample, + i2c_priv->channels); + if (ret) + return ret; + uc_priv->setup_done = true; + + return 0; +} + +static int samsung_sound_play(struct udevice *dev, void *data, uint data_size) +{ + struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev); + + return i2s_tx_data(uc_priv->i2s, data, data_size); +} + +static int samsung_sound_probe(struct udevice *dev) +{ + struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev); + struct ofnode_phandle_args args; + struct gpio_desc en_gpio; + ofnode node; + int ret; + + ret = gpio_request_by_name(dev, "codec-enable-gpio", 0, &en_gpio, + GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE); + + /* Turn on the GPIO which connects to the codec's "enable" line. */ + if (!ret) + gpio_set_pull(gpio_get_number(&en_gpio), S5P_GPIO_PULL_NONE); + + ret = uclass_get_device_by_phandle(UCLASS_AUDIO_CODEC, dev, + "samsung,audio-codec", + &uc_priv->codec); + if (ret) { + debug("Failed to probe audio codec\n"); + return ret; + } + node = ofnode_find_subnode(dev_ofnode(dev), "cpu"); + if (!ofnode_valid(node)) { + debug("Failed to find /cpu subnode\n"); + return -EINVAL; + } + ret = ofnode_parse_phandle_with_args(node, "sound-dai", + "#sound-dai-cells", 0, 0, &args); + if (ret) { + debug("Cannot find phandle: %d\n", ret); + return ret; + } + ret = uclass_get_device_by_ofnode(UCLASS_I2S, args.node, &uc_priv->i2s); + if (ret) { + debug("Cannot find i2s: %d\n", ret); + return ret; + } + debug("Probed sound '%s' with codec '%s' and i2s '%s'\n", dev->name, + uc_priv->codec->name, uc_priv->i2s->name); + + return 0; +} + +static const struct sound_ops samsung_sound_ops = { + .setup = samsung_sound_setup, + .play = samsung_sound_play, +}; + +static const struct udevice_id samsung_sound_ids[] = { + { .compatible = "google,snow-audio-max98095" }, + { } +}; + +U_BOOT_DRIVER(samsung_sound) = { + .name = "samsung_sound", + .id = UCLASS_SOUND, + .of_match = samsung_sound_ids, + .probe = samsung_sound_probe, + .ops = &samsung_sound_ops, +}; |