147 lines
4.2 KiB
C
147 lines
4.2 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_out_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_HI_DUALWIRE: At rates above 96 kHz, pretend that the stream runs
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* at half the actual sample rate with twice the number of channels;
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* two samples of a channel are stored consecutively in the packet.
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* Requires blocking mode and SYT_INTERVAL-aligned PCM buffer size.
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*/
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enum cip_out_flags {
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CIP_NONBLOCKING = 0x00,
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CIP_BLOCKING = 0x01,
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CIP_HI_DUALWIRE = 0x02,
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};
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/**
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* enum cip_sfc - a stream's sample rate
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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_OUT_PCM_FORMAT_BITS (SNDRV_PCM_FMTBIT_S16 | \
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SNDRV_PCM_FMTBIT_S32)
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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 amdtp_out_stream {
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struct fw_unit *unit;
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enum cip_out_flags flags;
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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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bool dual_wire;
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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_out_stream *s,
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struct snd_pcm_substream *pcm,
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__be32 *buffer, unsigned int frames);
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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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};
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int amdtp_out_stream_init(struct amdtp_out_stream *s, struct fw_unit *unit,
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enum cip_out_flags flags);
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void amdtp_out_stream_destroy(struct amdtp_out_stream *s);
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void amdtp_out_stream_set_parameters(struct amdtp_out_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_out_stream_get_max_payload(struct amdtp_out_stream *s);
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int amdtp_out_stream_start(struct amdtp_out_stream *s, int channel, int speed);
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void amdtp_out_stream_update(struct amdtp_out_stream *s);
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void amdtp_out_stream_stop(struct amdtp_out_stream *s);
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void amdtp_out_stream_set_pcm_format(struct amdtp_out_stream *s,
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snd_pcm_format_t format);
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void amdtp_out_stream_pcm_prepare(struct amdtp_out_stream *s);
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unsigned long amdtp_out_stream_pcm_pointer(struct amdtp_out_stream *s);
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void amdtp_out_stream_pcm_abort(struct amdtp_out_stream *s);
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extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT];
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static inline bool amdtp_out_stream_running(struct amdtp_out_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_out_streaming_error - check for streaming error
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* @s: the AMDTP output 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_out_streaming_error(struct amdtp_out_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_out_stream_pcm_trigger - start/stop playback from a PCM device
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* @s: the AMDTP output 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_out_stream_pcm_trigger(struct amdtp_out_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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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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#endif
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