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include/sound.h
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/* SPDX-License-Identifier: GPL-2.0+ */ |
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/* * Copyright (C) 2012 Samsung Electronics * R. Chandrasekar < rcsekar@samsung.com> |
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*/ #ifndef __SOUND_H__ #define __SOUND_H__ /* sound codec enum */ |
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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; |
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}; |
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/** * 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; }; /** |
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* Generates square wave sound data for 1 second * |
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* @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 |
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*/ |
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void sound_create_square_wave(uint sample_rate, unsigned short *data, int size, |
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uint freq, uint channels); |
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/* |
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* The sound uclass brings together a data transport (currently only I2C) and a * codec (currently connected over I2C). */ /* Operations for sound */ struct sound_ops { /** |
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* setup() - Set up to play a sound (optional) |
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*/ 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); |
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/** |
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* stop_play() - Indicate that there is no more data coming * * This is called once play() has finished sending all the data to the * output device. This may be used to tell the hardware to turn off the * codec, for example. * * @dev: Sound device * @return 0 if OK, -ve on error */ int (*stop_play)(struct udevice *dev); /** |
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* start_beep() - Start beeping (optional) * * This tells the sound hardware to start a beep. It will continue until * stopped by sound_stop_beep(). * * @dev: Sound device * @frequency_hz: Beep frequency in hertz * @return if OK, -ENOSYS if not supported, -ve on error */ int (*start_beep)(struct udevice *dev, int frequency_hz); /** * stop_beep() - Stop beeping (optional) * * This tells the sound hardware to stop a previously started beep. * * @dev: Sound device * @return if OK, -ve on error */ int (*stop_beep)(struct udevice *dev); |
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}; #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); /** |
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* sound_start_beep() - Start beeping * * This tells the sound hardware to start a beep. It will continue until stopped * by sound_stop_beep(). * * @dev: Sound device * @frequency_hz: Beep frequency in hertz * @return if OK, -ve on error */ int sound_start_beep(struct udevice *dev, int frequency_hz); /** * sound_stop_beep() - Stop beeping * * This tells the sound hardware to stop a previously started beep. * * @dev: Sound device * @return if OK, -ve on error */ int sound_stop_beep(struct udevice *dev); /** |
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* 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); |
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#endif /* __SOUND__H__ */ |