1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
/* 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 (optional)
*/
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);
/**
* 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);
/**
* 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);
};
#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_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);
/**
* 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__ */
|