/* * drivers/sbus/audio/audio.h * * Sparc Audio Midlayer * Copyright (C) 1996 Thomas K. Dyas (tdyas@noc.rutgers.edu) */ #ifndef _AUDIO_H_ #define _AUDIO_H_ /* * SunOS/Solaris /dev/audio interface */ #include #include #include /* * This structure contains state information for audio device IO streams. */ typedef struct audio_prinfo { /* * The following values describe the audio data encoding. */ unsigned int sample_rate; /* samples per second */ unsigned int channels; /* number of interleaved channels */ unsigned int precision; /* bit-width of each sample */ unsigned int encoding; /* data encoding method */ /* * The following values control audio device configuration */ unsigned int gain; /* gain level: 0 - 255 */ unsigned int port; /* selected I/O port (see below) */ unsigned int avail_ports; /* available I/O ports (see below) */ unsigned int _xxx[2]; /* Reserved for future use */ unsigned int buffer_size; /* I/O buffer size */ /* * The following values describe driver state */ unsigned int samples; /* number of samples converted */ unsigned int eof; /* End Of File counter (play only) */ unsigned char pause; /* non-zero for pause, zero to resume */ unsigned char error; /* non-zero if overflow/underflow */ unsigned char waiting; /* non-zero if a process wants access */ unsigned char balance; /* stereo channel balance */ unsigned short minordev; /* * The following values are read-only state flags */ unsigned char open; /* non-zero if open access permitted */ unsigned char active; /* non-zero if I/O is active */ } audio_prinfo_t; /* * This structure describes the current state of the audio device. */ typedef struct audio_info { /* * Per-stream information */ audio_prinfo_t play; /* output status information */ audio_prinfo_t record; /* input status information */ /* * Per-unit/channel information */ unsigned int monitor_gain; /* input to output mix: 0 - 255 */ unsigned char output_muted; /* non-zero if output is muted */ unsigned char _xxx[3]; /* Reserved for future use */ unsigned int _yyy[3]; /* Reserved for future use */ } audio_info_t; /* * Audio encoding types */ #define AUDIO_ENCODING_NONE (0) /* no encoding assigned */ #define AUDIO_ENCODING_ULAW (1) /* u-law encoding */ #define AUDIO_ENCODING_ALAW (2) /* A-law encoding */ #define AUDIO_ENCODING_LINEAR (3) /* Linear PCM encoding */ #define AUDIO_ENCODING_DVI (104) /* DVI ADPCM */ #define AUDIO_ENCODING_LINEAR8 (105) /* 8 bit UNSIGNED */ /* * These ranges apply to record, play, and monitor gain values */ #define AUDIO_MIN_GAIN (0) /* minimum gain value */ #define AUDIO_MAX_GAIN (255) /* maximum gain value */ /* * These values apply to the balance field to adjust channel gain values */ #define AUDIO_LEFT_BALANCE (0) /* left channel only */ #define AUDIO_MID_BALANCE (32) /* equal left/right channel */ #define AUDIO_RIGHT_BALANCE (64) /* right channel only */ #define AUDIO_BALANCE_SHIFT (3) /* * Generic minimum/maximum limits for number of channels, both modes */ #define AUDIO_MIN_PLAY_CHANNELS (1) #define AUDIO_MAX_PLAY_CHANNELS (4) #define AUDIO_MIN_REC_CHANNELS (1) #define AUDIO_MAX_REC_CHANNELS (4) /* * Generic minimum/maximum limits for sample precision */ #define AUDIO_MIN_PLAY_PRECISION (8) #define AUDIO_MAX_PLAY_PRECISION (32) #define AUDIO_MIN_REC_PRECISION (8) #define AUDIO_MAX_REC_PRECISION (32) /* * Define some convenient names for typical audio ports */ /* * output ports (several may be enabled simultaneously) */ #define AUDIO_SPEAKER 0x01 /* output to built-in speaker */ #define AUDIO_HEADPHONE 0x02 /* output to headphone jack */ #define AUDIO_LINE_OUT 0x04 /* output to line out */ /* * input ports (usually only one at a time) */ #define AUDIO_MICROPHONE 0x01 /* input from microphone */ #define AUDIO_LINE_IN 0x02 /* input from line in */ #define AUDIO_CD 0x04 /* input from on-board CD inputs */ #define AUDIO_INTERNAL_CD_IN AUDIO_CD /* input from internal CDROM */ /* * This macro initializes an audio_info structure to 'harmless' values. * Note that (~0) might not be a harmless value for a flag that was * a signed int. */ #define AUDIO_INITINFO(i) { \ unsigned int *__x__; \ for (__x__ = (unsigned int *)(i); \ (char *) __x__ < (((char *)(i)) + sizeof (audio_info_t)); \ *__x__++ = ~0); \ } /* * Parameter for the AUDIO_GETDEV ioctl to determine current * audio devices. */ #define MAX_AUDIO_DEV_LEN (16) typedef struct audio_device { char name[MAX_AUDIO_DEV_LEN]; char version[MAX_AUDIO_DEV_LEN]; char config[MAX_AUDIO_DEV_LEN]; } audio_device_t; /* * Ioctl calls for the audio device. */ /* * AUDIO_GETINFO retrieves the current state of the audio device. * * AUDIO_SETINFO copies all fields of the audio_info structure whose * values are not set to the initialized value (-1) to the device state. * It performs an implicit AUDIO_GETINFO to return the new state of the * device. Note that the record.samples and play.samples fields are set * to the last value before the AUDIO_SETINFO took effect. This allows * an application to reset the counters while atomically retrieving the * last value. * * AUDIO_DRAIN suspends the calling process until the write buffers are * empty. * * AUDIO_GETDEV returns a structure of type audio_device_t which contains * three strings. The string "name" is a short identifying string (for * example, the SBus Fcode name string), the string "version" identifies * the current version of the device, and the "config" string identifies * the specific configuration of the audio stream. All fields are * device-dependent -- see the device specific manual pages for details. */ #define AUDIO_GETINFO _IOR('A', 1, audio_info_t) #define AUDIO_SETINFO _IOWR('A', 2, audio_info_t) #define AUDIO_DRAIN _IO('A', 3) #define AUDIO_GETDEV _IOR('A', 4, audio_device_t) /* * The following ioctl sets the audio device into an internal loopback mode, * if the hardware supports this. The argument is TRUE to set loopback, * FALSE to reset to normal operation. If the hardware does not support * internal loopback, the ioctl should fail with EINVAL. */ #define AUDIO_DIAG_LOOPBACK _IOW('A', 101, int) #ifdef notneeded /* * Structure sent up as a M_PROTO message on trace streams */ typedef struct audtrace_hdr audtrace_hdr_t; struct audtrace_hdr { unsigned int seq; /* Sequence number (per-aud_stream) */ int type; /* device-dependent */ struct timeval timestamp; char _f[8]; /* filler */ }; #endif /* * Linux kernel internal implementation. */ #ifdef __KERNEL__ #include #include #include #include #define SDF_OPEN_WRITE 0x00000001 #define SDF_OPEN_READ 0x00000002 struct sparcaudio_driver { const char * name; struct sparcaudio_operations *ops; void *private; unsigned long flags; /* Processes blocked on open() sit here. */ struct wait_queue *open_wait; /* Task queue for this driver's bottom half. */ struct tq_struct tqueue; /* Support for a circular queue of output buffers. */ __u8 **output_buffers; size_t *output_sizes; int num_output_buffers, output_front, output_rear; int output_count, output_active; struct wait_queue *output_write_wait, *output_drain_wait; }; struct sparcaudio_operations { int (*open)(struct inode *, struct file *, struct sparcaudio_driver *); void (*release)(struct inode *, struct file *, struct sparcaudio_driver *); int (*ioctl)(struct inode *, struct file *, unsigned int, unsigned long, struct sparcaudio_driver *); /* Ask driver to begin playing a buffer. */ void (*start_output)(struct sparcaudio_driver *, __u8 *, unsigned long); /* Ask driver to stop playing a buffer. */ void (*stop_output)(struct sparcaudio_driver *); /* Ask driver to begin recording into a buffer. */ void (*start_input)(struct sparcaudio_driver *, __u8 *, unsigned long); /* Ask driver to stop recording. */ void (*stop_input)(struct sparcaudio_driver *); /* Return driver name/version to caller. (/dev/audio specific) */ void (*sunaudio_getdev)(struct sparcaudio_driver *, audio_device_t *); }; extern int register_sparcaudio_driver(struct sparcaudio_driver *); extern int unregister_sparcaudio_driver(struct sparcaudio_driver *); extern void sparcaudio_output_done(struct sparcaudio_driver *); extern void sparcaudio_input_done(struct sparcaudio_driver *); extern int sparcaudio_init(void); extern int amd7930_init(void); extern int cs4231_init(void); #endif #endif