From e96fa6c91177d0aa81119d1d24cc0aa2dd663581 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Mon, 10 Dec 2018 10:37:34 -0700 Subject: dm: sound: Create a uclass for i2s The i2s bus is commonly used with audio codecs. It provides a way to stream digital data sychronously in both directions. U-Boot only supports audio output, so this uclass is very simple, with a single tx_data() method. Add a uclass and a test for i2s. Signed-off-by: Simon Glass --- include/dm/uclass-id.h | 1 + include/i2s.h | 32 ++++++++++++++++++++++++++++---- 2 files changed, 29 insertions(+), 4 deletions(-) (limited to 'include') diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h index c3c18356ab6..1dffb669329 100644 --- a/include/dm/uclass-id.h +++ b/include/dm/uclass-id.h @@ -49,6 +49,7 @@ enum uclass_id { UCLASS_I2C_EEPROM, /* I2C EEPROM device */ UCLASS_I2C_GENERIC, /* Generic I2C device */ UCLASS_I2C_MUX, /* I2C multiplexer */ + UCLASS_I2S, /* I2S bus */ UCLASS_IDE, /* IDE device */ UCLASS_IRQ, /* Interrupt controller */ UCLASS_KEYBOARD, /* Keyboard input device */ diff --git a/include/i2s.h b/include/i2s.h index f23862ca040..28f6184811c 100644 --- a/include/i2s.h +++ b/include/i2s.h @@ -87,17 +87,41 @@ struct i2s_uc_priv { unsigned int id; /* I2S controller id */ }; +/* Operations for i2s devices */ +struct i2s_ops { + /** + * tx_data() - Transmit audio data + * + * @dev: I2C device + * @data: Data buffer to play + * @data_size: Size of data buffer in bytes + * @return 0 if OK, -ve on error + */ + int (*tx_data)(struct udevice *dev, void *data, uint data_size); +}; + +#define i2s_get_ops(dev) ((struct i2s_ops *)(dev)->driver->ops) + +/** + * i2s_tx_data() - Transmit audio data + * + * @dev: I2C device + * @data: Data buffer to play + * @data_size: Size of data buffer in bytes + * @return 0 if OK, -ve on error + */ +int i2s_tx_data(struct udevice *dev, void *data, uint data_size); + /* * Sends the given data through i2s tx * * @param pi2s_tx pointer of i2s transmitter parameter structure. * @param data address of the data buffer - * @param data_size array size of the int buffer (total size / size of int) - * + * @param data_size size of the data (in bytes) * @return int value 0 for success, -1 in case of error */ -int i2s_transfer_tx_data(struct i2s_uc_priv *pi2s_tx, unsigned int *data, - unsigned long data_size); +int i2s_transfer_tx_data(struct i2s_uc_priv *pi2s_tx, void *data, + uint data_size); /* * Initialise i2s transmiter -- cgit v1.3.1