u-boot/include/sound.h
Simon Glass f987177db9 dm: sound: Use the correct number of channels for sound
At present the 'beep' sound generates a waveform for only one channel even
if two are being used. This means that the beep is twice the frequency it
should be. Correct this by making it a parameter.

The fix in a previous commit was correct for sandbox but not for other
boards.

Fixes: 03f11e87a8 ("sound: Correct data output in sound_create_square_wave()")
Signed-off-by: Simon Glass <sjg@chromium.org>
2018-12-13 16:37:10 -07:00

97 lines
2.2 KiB
C

/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2012 Samsung Electronics
* R. Chandrasekar < rcsekar@samsung.com>
*/
#ifndef __SOUND_H__
#define __SOUND_H__
/* sound codec enum */
enum sound_compat {
AUDIO_COMPAT_SPI,
AUDIO_COMPAT_I2C,
};
/* Codec information structure to store the info from device tree */
struct sound_codec_info {
int i2c_bus;
int i2c_dev_addr;
};
/**
* struct sound_uc_priv - private uclass information about each sound device
*
* This is used to line the codec and i2s together
*
* @codec: Codec that is used for this sound device
* @i2s: I2S bus that is used for this sound device
* @setup_done: true if setup() has been called
*/
struct sound_uc_priv {
struct udevice *codec;
struct udevice *i2s;
int setup_done;
};
/**
* Generates square wave sound data for 1 second
*
* @sample_rate: Sample rate in Hz
* @data: data buffer pointer
* @size: size of the buffer in bytes
* @freq: frequency of the wave
* @channels: Number of channels to use
*/
void sound_create_square_wave(uint sample_rate, unsigned short *data, int size,
uint freq, uint channels);
/*
* The sound uclass brings together a data transport (currently only I2C) and a
* codec (currently connected over I2C).
*/
/* Operations for sound */
struct sound_ops {
/**
* setup() - Set up to play a sound
*/
int (*setup)(struct udevice *dev);
/**
* play() - Play a beep
*
* @dev: Sound device
* @data: Data buffer to play
* @data_size: Size of data buffer in bytes
* @return 0 if OK, -ve on error
*/
int (*play)(struct udevice *dev, void *data, uint data_size);
};
#define sound_get_ops(dev) ((struct sound_ops *)(dev)->driver->ops)
/**
* setup() - Set up to play a sound
*/
int sound_setup(struct udevice *dev);
/**
* play() - Play a beep
*
* @dev: Sound device
* @msecs: Duration of beep in milliseconds
* @frequency_hz: Frequency of the beep in Hertz
* @return 0 if OK, -ve on error
*/
int sound_beep(struct udevice *dev, int msecs, int frequency_hz);
/**
* sound_find_codec_i2s() - Called by sound drivers to locate codec and i2s
*
* This finds the audio codec and i2s devices and puts them in the uclass's
* private data for this device.
*/
int sound_find_codec_i2s(struct udevice *dev);
#endif /* __SOUND__H__ */