294 lines
8.9 KiB
C
294 lines
8.9 KiB
C
#ifndef SOUND_FIREWIRE_AMDTP_H_INCLUDED
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#define SOUND_FIREWIRE_AMDTP_H_INCLUDED
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/mutex.h>
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#include <sound/asound.h>
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#include "packets-buffer.h"
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/**
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* enum cip_flags - describes details of the streaming protocol
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* @CIP_NONBLOCKING: In non-blocking mode, each packet contains
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* sample_rate/8000 samples, with rounding up or down to adjust
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* for clock skew and left-over fractional samples. This should
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* be used if supported by the device.
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* @CIP_BLOCKING: In blocking mode, each packet contains either zero or
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* SYT_INTERVAL samples, with these two types alternating so that
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* the overall sample rate comes out right.
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* @CIP_SYNC_TO_DEVICE: In sync to device mode, time stamp in out packets is
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* generated by in packets. Defaultly this driver generates timestamp.
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* @CIP_EMPTY_WITH_TAG0: Only for in-stream. Empty in-packets have TAG0.
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* @CIP_DBC_IS_END_EVENT: Only for in-stream. The value of dbc in an in-packet
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* corresponds to the end of event in the packet. Out of IEC 61883.
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* @CIP_WRONG_DBS: Only for in-stream. The value of dbs is wrong in in-packets.
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* The value of data_block_quadlets is used instead of reported value.
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* @CIP_SKIP_DBC_ZERO_CHECK: Only for in-stream. Packets with zero in dbc is
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* skipped for detecting discontinuity.
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* @CIP_SKIP_INIT_DBC_CHECK: Only for in-stream. The value of dbc in first
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* packet is not continuous from an initial value.
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* @CIP_EMPTY_HAS_WRONG_DBC: Only for in-stream. The value of dbc in empty
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* packet is wrong but the others are correct.
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*/
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enum cip_flags {
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CIP_NONBLOCKING = 0x00,
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CIP_BLOCKING = 0x01,
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CIP_SYNC_TO_DEVICE = 0x02,
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CIP_EMPTY_WITH_TAG0 = 0x04,
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CIP_DBC_IS_END_EVENT = 0x08,
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CIP_WRONG_DBS = 0x10,
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CIP_SKIP_DBC_ZERO_CHECK = 0x20,
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CIP_SKIP_INIT_DBC_CHECK = 0x40,
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CIP_EMPTY_HAS_WRONG_DBC = 0x80,
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};
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/**
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* enum cip_sfc - supported Sampling Frequency Codes (SFCs)
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* @CIP_SFC_32000: 32,000 data blocks
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* @CIP_SFC_44100: 44,100 data blocks
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* @CIP_SFC_48000: 48,000 data blocks
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* @CIP_SFC_88200: 88,200 data blocks
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* @CIP_SFC_96000: 96,000 data blocks
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* @CIP_SFC_176400: 176,400 data blocks
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* @CIP_SFC_192000: 192,000 data blocks
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* @CIP_SFC_COUNT: the number of supported SFCs
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*
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* These values are used to show nominal Sampling Frequency Code in
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* Format Dependent Field (FDF) of AMDTP packet header. In IEC 61883-6:2002,
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* this code means the number of events per second. Actually the code
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* represents the number of data blocks transferred per second in an AMDTP
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* stream.
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*
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* In IEC 61883-6:2005, some extensions were added to support more types of
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* data such as 'One Bit LInear Audio', therefore the meaning of SFC became
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* different depending on the types.
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*
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* Currently our implementation is compatible with IEC 61883-6:2002.
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*/
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enum cip_sfc {
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CIP_SFC_32000 = 0,
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CIP_SFC_44100 = 1,
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CIP_SFC_48000 = 2,
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CIP_SFC_88200 = 3,
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CIP_SFC_96000 = 4,
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CIP_SFC_176400 = 5,
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CIP_SFC_192000 = 6,
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CIP_SFC_COUNT
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};
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#define AMDTP_IN_PCM_FORMAT_BITS SNDRV_PCM_FMTBIT_S32
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#define AMDTP_OUT_PCM_FORMAT_BITS (SNDRV_PCM_FMTBIT_S16 | \
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SNDRV_PCM_FMTBIT_S32)
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/*
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* This module supports maximum 64 PCM channels for one PCM stream
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* This is for our convenience.
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*/
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#define AMDTP_MAX_CHANNELS_FOR_PCM 64
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/*
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* AMDTP packet can include channels for MIDI conformant data.
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* Each MIDI conformant data channel includes 8 MPX-MIDI data stream.
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* Each MPX-MIDI data stream includes one data stream from/to MIDI ports.
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*
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* This module supports maximum 1 MIDI conformant data channels.
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* Then this AMDTP packets can transfer maximum 8 MIDI data streams.
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*/
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#define AMDTP_MAX_CHANNELS_FOR_MIDI 1
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struct fw_unit;
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struct fw_iso_context;
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struct snd_pcm_substream;
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struct snd_pcm_runtime;
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struct snd_rawmidi_substream;
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enum amdtp_stream_direction {
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AMDTP_OUT_STREAM = 0,
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AMDTP_IN_STREAM
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};
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struct amdtp_stream {
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struct fw_unit *unit;
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enum cip_flags flags;
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enum amdtp_stream_direction direction;
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struct fw_iso_context *context;
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struct mutex mutex;
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enum cip_sfc sfc;
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unsigned int data_block_quadlets;
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unsigned int pcm_channels;
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unsigned int midi_ports;
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void (*transfer_samples)(struct amdtp_stream *s,
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struct snd_pcm_substream *pcm,
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__be32 *buffer, unsigned int frames);
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u8 pcm_positions[AMDTP_MAX_CHANNELS_FOR_PCM];
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u8 midi_position;
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unsigned int syt_interval;
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unsigned int transfer_delay;
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unsigned int source_node_id_field;
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struct iso_packets_buffer buffer;
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struct snd_pcm_substream *pcm;
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struct tasklet_struct period_tasklet;
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int packet_index;
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unsigned int data_block_counter;
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unsigned int data_block_state;
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unsigned int last_syt_offset;
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unsigned int syt_offset_state;
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unsigned int pcm_buffer_pointer;
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unsigned int pcm_period_pointer;
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bool pointer_flush;
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bool double_pcm_frames;
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struct snd_rawmidi_substream *midi[AMDTP_MAX_CHANNELS_FOR_MIDI * 8];
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/* quirk: fixed interval of dbc between previos/current packets. */
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unsigned int tx_dbc_interval;
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/* quirk: the first count of data blocks in an rx packet for MIDI */
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unsigned int rx_blocks_for_midi;
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bool callbacked;
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wait_queue_head_t callback_wait;
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struct amdtp_stream *sync_slave;
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};
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int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
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enum amdtp_stream_direction dir,
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enum cip_flags flags);
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void amdtp_stream_destroy(struct amdtp_stream *s);
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void amdtp_stream_set_parameters(struct amdtp_stream *s,
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unsigned int rate,
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unsigned int pcm_channels,
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unsigned int midi_ports);
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unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s);
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int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed);
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void amdtp_stream_update(struct amdtp_stream *s);
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void amdtp_stream_stop(struct amdtp_stream *s);
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int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s,
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struct snd_pcm_runtime *runtime);
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void amdtp_stream_set_pcm_format(struct amdtp_stream *s,
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snd_pcm_format_t format);
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void amdtp_stream_pcm_prepare(struct amdtp_stream *s);
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unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s);
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void amdtp_stream_pcm_abort(struct amdtp_stream *s);
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extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT];
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extern const unsigned int amdtp_rate_table[CIP_SFC_COUNT];
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/**
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* amdtp_stream_running - check stream is running or not
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* @s: the AMDTP stream
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*
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* If this function returns true, the stream is running.
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*/
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static inline bool amdtp_stream_running(struct amdtp_stream *s)
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{
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return !IS_ERR(s->context);
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}
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/**
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* amdtp_streaming_error - check for streaming error
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* @s: the AMDTP stream
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*
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* If this function returns true, the stream's packet queue has stopped due to
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* an asynchronous error.
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*/
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static inline bool amdtp_streaming_error(struct amdtp_stream *s)
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{
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return s->packet_index < 0;
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}
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/**
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* amdtp_stream_pcm_running - check PCM substream is running or not
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* @s: the AMDTP stream
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*
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* If this function returns true, PCM substream in the AMDTP stream is running.
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*/
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static inline bool amdtp_stream_pcm_running(struct amdtp_stream *s)
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{
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return !!s->pcm;
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}
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/**
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* amdtp_stream_pcm_trigger - start/stop playback from a PCM device
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* @s: the AMDTP stream
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* @pcm: the PCM device to be started, or %NULL to stop the current device
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*
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* Call this function on a running isochronous stream to enable the actual
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* transmission of PCM data. This function should be called from the PCM
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* device's .trigger callback.
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*/
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static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s,
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struct snd_pcm_substream *pcm)
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{
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ACCESS_ONCE(s->pcm) = pcm;
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}
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/**
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* amdtp_stream_midi_trigger - start/stop playback/capture with a MIDI device
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* @s: the AMDTP stream
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* @port: index of MIDI port
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* @midi: the MIDI device to be started, or %NULL to stop the current device
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*
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* Call this function on a running isochronous stream to enable the actual
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* transmission of MIDI data. This function should be called from the MIDI
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* device's .trigger callback.
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*/
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static inline void amdtp_stream_midi_trigger(struct amdtp_stream *s,
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unsigned int port,
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struct snd_rawmidi_substream *midi)
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{
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if (port < s->midi_ports)
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ACCESS_ONCE(s->midi[port]) = midi;
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}
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static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
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{
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return sfc & 1;
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}
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static inline void amdtp_stream_set_sync(enum cip_flags sync_mode,
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struct amdtp_stream *master,
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struct amdtp_stream *slave)
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{
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if (sync_mode == CIP_SYNC_TO_DEVICE) {
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master->flags |= CIP_SYNC_TO_DEVICE;
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slave->flags |= CIP_SYNC_TO_DEVICE;
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master->sync_slave = slave;
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} else {
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master->flags &= ~CIP_SYNC_TO_DEVICE;
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slave->flags &= ~CIP_SYNC_TO_DEVICE;
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master->sync_slave = NULL;
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}
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slave->sync_slave = NULL;
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}
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/**
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* amdtp_stream_wait_callback - sleep till callbacked or timeout
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* @s: the AMDTP stream
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* @timeout: msec till timeout
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*
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* If this function return false, the AMDTP stream should be stopped.
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*/
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static inline bool amdtp_stream_wait_callback(struct amdtp_stream *s,
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unsigned int timeout)
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{
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return wait_event_timeout(s->callback_wait,
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s->callbacked == true,
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msecs_to_jiffies(timeout)) > 0;
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}
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#endif
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