diff options
| author | Simon Glass <sjg@chromium.org> | 2018-12-10 20:37:34 +0300 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2018-12-14 02:32:49 +0300 |
| commit | e96fa6c91177d0aa81119d1d24cc0aa2dd663581 (patch) | |
| tree | 333d54a1f9349c5e238f836675d49dbe5b59bc4b /include/i2s.h | |
| parent | ce6d99a056ebc9ad329521ca3660f6cb298a7666 (diff) | |
| download | u-boot-e96fa6c91177d0aa81119d1d24cc0aa2dd663581.tar.xz | |
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 <sjg@chromium.org>
Diffstat (limited to 'include/i2s.h')
| -rw-r--r-- | include/i2s.h | 32 |
1 files changed, 28 insertions, 4 deletions
diff --git a/include/i2s.h b/include/i2s.h index f23862ca04..28f6184811 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 |