include/sound.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * Copyright (C) 2012 Samsung Electronics
   4  * R. Chandrasekar < rcsekar@samsung.com>
   5  */
   6
   7 #ifndef __SOUND_H__
   8 #define __SOUND_H__
   9
  10 /* sound codec enum */
  11 enum sound_compat {
  12         AUDIO_COMPAT_SPI,
  13         AUDIO_COMPAT_I2C,
  14 };
  15
  16 /* Codec information structure to store the info from device tree */
  17 struct sound_codec_info {
  18         int i2c_bus;
  19         int i2c_dev_addr;
  20 };
  21
  22 /**
  23  * struct sound_uc_priv - private uclass information about each sound device
  24  *
  25  * This is used to line the codec and i2s together
  26  *
  27  * @codec: Codec that is used for this sound device
  28  * @i2s: I2S bus that is used for this sound device
  29  * @setup_done: true if setup() has been called
  30  */
  31 struct sound_uc_priv {
  32         struct udevice *codec;
  33         struct udevice *i2s;
  34         int setup_done;
  35 };
  36
  37 /**
  38  * Generates square wave sound data for 1 second
  39  *
  40  * @sample_rate: Sample rate in Hz
  41  * @data: data buffer pointer
  42  * @size: size of the buffer in bytes
  43  * @freq: frequency of the wave
  44  * @channels: Number of channels to use
  45  */
  46 void sound_create_square_wave(uint sample_rate, unsigned short *data, int size,
  47                               uint freq, uint channels);
  48
  49 /*
  50  * The sound uclass brings together a data transport (currently only I2C) and a
  51  * codec (currently connected over I2C).
  52  */
  53
  54 /* Operations for sound */
  55 struct sound_ops {
  56         /**
  57          * setup() - Set up to play a sound (optional)
  58          */
  59         int (*setup)(struct udevice *dev);
  60
  61         /**
  62          * play() - Play a beep
  63          *
  64          * @dev: Sound device
  65          * @data: Data buffer to play
  66          * @data_size: Size of data buffer in bytes
  67          * @return 0 if OK, -ve on error
  68          */
  69         int (*play)(struct udevice *dev, void *data, uint data_size);
  70
  71         /**
  72          * start_beep() - Start beeping (optional)
  73          *
  74          * This tells the sound hardware to start a beep. It will continue until
  75          * stopped by sound_stop_beep().
  76          *
  77          * @dev: Sound device
  78          * @frequency_hz: Beep frequency in hertz
  79          * @return if OK, -ENOSYS if not supported, -ve on error
  80          */
  81         int (*start_beep)(struct udevice *dev, int frequency_hz);
  82
  83         /**
  84          * stop_beep() - Stop beeping (optional)
  85          *
  86          * This tells the sound hardware to stop a previously started beep.
  87          *
  88          * @dev: Sound device
  89          * @return if OK, -ve on error
  90          */
  91         int (*stop_beep)(struct udevice *dev);
  92 };
  93
  94 #define sound_get_ops(dev)      ((struct sound_ops *)(dev)->driver->ops)
  95
  96 /**
  97  * setup() - Set up to play a sound
  98  */
  99 int sound_setup(struct udevice *dev);
 100
 101 /**
 102  * play() - Play a beep
 103  *
 104  * @dev: Sound device
 105  * @msecs: Duration of beep in milliseconds
 106  * @frequency_hz: Frequency of the beep in Hertz
 107  * @return 0 if OK, -ve on error
 108  */
 109 int sound_beep(struct udevice *dev, int msecs, int frequency_hz);
 110
 111 /**
 112  * sound_start_beep() - Start beeping
 113  *
 114  * This tells the sound hardware to start a beep. It will continue until stopped
 115  * by sound_stop_beep().
 116  *
 117  * @dev: Sound device
 118  * @frequency_hz: Beep frequency in hertz
 119  * @return if OK, -ve on error
 120  */
 121 int sound_start_beep(struct udevice *dev, int frequency_hz);
 122
 123 /**
 124  * sound_stop_beep() - Stop beeping
 125  *
 126  * This tells the sound hardware to stop a previously started beep.
 127  *
 128  * @dev: Sound device
 129  * @return if OK, -ve on error
 130  */
 131 int sound_stop_beep(struct udevice *dev);
 132
 133 /**
 134  * sound_find_codec_i2s() - Called by sound drivers to locate codec and i2s
 135  *
 136  * This finds the audio codec and i2s devices and puts them in the uclass's
 137  * private data for this device.
 138  */
 139 int sound_find_codec_i2s(struct udevice *dev);
 140
 141 #endif  /* __SOUND__H__ */