include/asm-sparc/audioio.h

   1 /*
   2  * include/asm-sparc/audioio.h
   3  *
   4  * Sparc Audio Midlayer
   5  * Copyright (C) 1996 Thomas K. Dyas (tdyas@noc.rutgers.edu)
   6  */
   7
   8 #ifndef _AUDIOIO_H_
   9 #define _AUDIOIO_H_
  10
  11 /*
  12  *      SunOS/Solaris /dev/audio interface
  13  */
  14
  15 #if defined(__KERNEL__) || !defined(__GLIBC__) || (__GLIBC__ < 2)
  16 #include <linux/types.h>
  17 #include <linux/time.h>
  18 #include <linux/ioctl.h>
  19 #endif
  20
  21 /*
  22  * This structure contains state information for audio device IO streams.
  23  */
  24 typedef struct audio_prinfo {
  25         /*
  26          * The following values describe the audio data encoding.
  27          */
  28         unsigned int sample_rate;       /* samples per second */
  29         unsigned int channels;  /* number of interleaved channels */
  30         unsigned int precision; /* bit-width of each sample */
  31         unsigned int encoding;  /* data encoding method */
  32
  33         /*
  34          * The following values control audio device configuration
  35          */
  36         unsigned int gain;              /* gain level: 0 - 255 */
  37         unsigned int port;              /* selected I/O port (see below) */
  38         unsigned int avail_ports;       /* available I/O ports (see below) */
  39         unsigned int _xxx[2];           /* Reserved for future use */
  40
  41         unsigned int buffer_size;       /* I/O buffer size */
  42
  43         /*
  44          * The following values describe driver state
  45          */
  46         unsigned int samples;           /* number of samples converted */
  47         unsigned int eof;               /* End Of File counter (play only) */
  48
  49         unsigned char   pause;          /* non-zero for pause, zero to resume */
  50         unsigned char   error;          /* non-zero if overflow/underflow */
  51         unsigned char   waiting;        /* non-zero if a process wants access */
  52         unsigned char balance;  /* stereo channel balance */
  53
  54         unsigned short minordev;
  55
  56         /*
  57          * The following values are read-only state flags
  58          */
  59         unsigned char open;             /* non-zero if open access permitted */
  60         unsigned char active;           /* non-zero if I/O is active */
  61 } audio_prinfo_t;
  62
  63
  64 /*
  65  * This structure describes the current state of the audio device.
  66  */
  67 typedef struct audio_info {
  68         /*
  69          * Per-stream information
  70          */
  71         audio_prinfo_t play;    /* output status information */
  72         audio_prinfo_t record;  /* input status information */
  73
  74         /*
  75          * Per-unit/channel information
  76          */
  77         unsigned int monitor_gain;      /* input to output mix: 0 - 255 */
  78         unsigned char output_muted;     /* non-zero if output is muted */
  79         unsigned char _xxx[3];  /* Reserved for future use */
  80         unsigned int _yyy[3];           /* Reserved for future use */
  81 } audio_info_t;
  82
  83
  84 /*
  85  * Audio encoding types
  86  */
  87 #define AUDIO_ENCODING_NONE     (0)     /* no encoding assigned   */
  88 #define AUDIO_ENCODING_ULAW     (1)     /* u-law encoding         */
  89 #define AUDIO_ENCODING_ALAW     (2)     /* A-law encoding         */
  90 #define AUDIO_ENCODING_LINEAR   (3)     /* Linear PCM encoding    */
  91 #define AUDIO_ENCODING_FLOAT    (4)     /* IEEE float (-1. <-> +1.) */
  92 #define AUDIO_ENCODING_DVI      (104)   /* DVI ADPCM              */
  93 #define AUDIO_ENCODING_LINEAR8  (105)   /* 8 bit UNSIGNED         */
  94 #define AUDIO_ENCODING_LINEARLE (106)   /* Linear PCM LE encoding */
  95
  96 /*
  97  * These ranges apply to record, play, and monitor gain values
  98  */
  99 #define AUDIO_MIN_GAIN  (0)     /* minimum gain value */
 100 #define AUDIO_MAX_GAIN  (255)   /* maximum gain value */
 101
 102 /*
 103  * These values apply to the balance field to adjust channel gain values
 104  */
 105 #define AUDIO_LEFT_BALANCE      (0)     /* left channel only    */
 106 #define AUDIO_MID_BALANCE       (32)    /* equal left/right channel */
 107 #define AUDIO_RIGHT_BALANCE     (64)    /* right channel only   */
 108 #define AUDIO_BALANCE_SHIFT     (3)
 109
 110 /*
 111  * Generic minimum/maximum limits for number of channels, both modes
 112  */
 113 #define AUDIO_MIN_PLAY_CHANNELS (1)
 114 #define AUDIO_MAX_PLAY_CHANNELS (4)
 115 #define AUDIO_MIN_REC_CHANNELS  (1)
 116 #define AUDIO_MAX_REC_CHANNELS  (4)
 117
 118 /*
 119  * Generic minimum/maximum limits for sample precision
 120  */
 121 #define AUDIO_MIN_PLAY_PRECISION        (8)
 122 #define AUDIO_MAX_PLAY_PRECISION        (32)
 123 #define AUDIO_MIN_REC_PRECISION         (8)
 124 #define AUDIO_MAX_REC_PRECISION         (32)
 125
 126 /*
 127  * Define some convenient names for typical audio ports
 128  */
 129 /*
 130  * output ports (several may be enabled simultaneously)
 131  */
 132 #define AUDIO_SPEAKER           0x01    /* output to built-in speaker */
 133 #define AUDIO_HEADPHONE         0x02    /* output to headphone jack */
 134 #define AUDIO_LINE_OUT          0x04    /* output to line out    */
 135
 136 /*
 137  * input ports (usually only one at a time)
 138  */
 139 #define AUDIO_MICROPHONE        0x01    /* input from microphone */
 140 #define AUDIO_LINE_IN           0x02    /* input from line in    */
 141 #define AUDIO_CD                0x04    /* input from on-board CD inputs */
 142 #define AUDIO_INTERNAL_CD_IN    AUDIO_CD        /* input from internal CDROM */
 143 #define AUDIO_ANALOG_LOOPBACK   0x40    /* input from output */
 144
 145
 146 /*
 147  * This macro initializes an audio_info structure to 'harmless' values.
 148  * Note that (~0) might not be a harmless value for a flag that was
 149  * a signed int.
 150  */
 151 #define AUDIO_INITINFO(i)       {                                       \
 152         unsigned int    *__x__;                                         \
 153         for (__x__ = (unsigned int *)(i);                               \
 154             (char *) __x__ < (((char *)(i)) + sizeof (audio_info_t));   \
 155             *__x__++ = ~0);                                             \
 156 }
 157
 158 /*
 159  * These allow testing for what the user wants to set
 160  */
 161 #define AUD_INITVALUE   (~0)
 162 #define Modify(X)       ((unsigned int)(X) != AUD_INITVALUE)
 163 #define Modifys(X)      ((X) != (unsigned short)AUD_INITVALUE)
 164 #define Modifyc(X)      ((X) != (unsigned char)AUD_INITVALUE)
 165
 166 /*
 167  * Parameter for the AUDIO_GETDEV ioctl to determine current
 168  * audio devices.
 169  */
 170 #define MAX_AUDIO_DEV_LEN       (16)
 171 typedef struct audio_device {
 172         char name[MAX_AUDIO_DEV_LEN];
 173         char version[MAX_AUDIO_DEV_LEN];
 174         char config[MAX_AUDIO_DEV_LEN];
 175 } audio_device_t;
 176
 177
 178 /*
 179  * Ioctl calls for the audio device.
 180  */
 181
 182 /*
 183  * AUDIO_GETINFO retrieves the current state of the audio device.
 184  *
 185  * AUDIO_SETINFO copies all fields of the audio_info structure whose
 186  * values are not set to the initialized value (-1) to the device state.
 187  * It performs an implicit AUDIO_GETINFO to return the new state of the
 188  * device.  Note that the record.samples and play.samples fields are set
 189  * to the last value before the AUDIO_SETINFO took effect.  This allows
 190  * an application to reset the counters while atomically retrieving the
 191  * last value.
 192  *
 193  * AUDIO_DRAIN suspends the calling process until the write buffers are
 194  * empty.
 195  *
 196  * AUDIO_GETDEV returns a structure of type audio_device_t which contains
 197  * three strings.  The string "name" is a short identifying string (for
 198  * example, the SBus Fcode name string), the string "version" identifies
 199  * the current version of the device, and the "config" string identifies
 200  * the specific configuration of the audio stream.  All fields are
 201  * device-dependent -- see the device specific manual pages for details.
 202  *
 203  * AUDIO_GETDEV_SUNOS returns a number which is an audio device defined
 204  * herein (making it not too portable)
 205  *
 206  * AUDIO_FLUSH stops all playback and recording, clears all queued buffers,
 207  * resets error counters, and restarts recording and playback as appropriate
 208  * for the current sampling mode.
 209  */
 210 #define AUDIO_GETINFO   _IOR('A', 1, audio_info_t)
 211 #define AUDIO_SETINFO   _IOWR('A', 2, audio_info_t)
 212 #define AUDIO_DRAIN     _IO('A', 3)
 213 #define AUDIO_GETDEV    _IOR('A', 4, audio_device_t)
 214 #define AUDIO_GETDEV_SUNOS      _IOR('A', 4, int)
 215 #define AUDIO_FLUSH     _IO('A', 5)
 216
 217 /* Define possible audio hardware configurations for
 218  * old SunOS-style AUDIO_GETDEV ioctl */
 219 #define AUDIO_DEV_UNKNOWN       (0)     /* not defined */
 220 #define AUDIO_DEV_AMD           (1)     /* audioamd device */
 221 #define AUDIO_DEV_SPEAKERBOX    (2)     /* dbri device with speakerbox */
 222 #define AUDIO_DEV_CODEC         (3)     /* dbri device (internal speaker) */
 223 #define AUDIO_DEV_CS4231        (5)     /* cs4231 device */
 224
 225 /*
 226  * The following ioctl sets the audio device into an internal loopback mode,
 227  * if the hardware supports this.  The argument is TRUE to set loopback,
 228  * FALSE to reset to normal operation.  If the hardware does not support
 229  * internal loopback, the ioctl should fail with EINVAL.
 230  * Causes ADC data to be digitally mixed in and sent to the DAC.
 231  */
 232 #define AUDIO_DIAG_LOOPBACK     _IOW('A', 101, int)
 233
 234 #endif /* _AUDIOIO_H_ */