original development tree for Linux kernel GTP module; now long in mainline.
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#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/mutex.h>
#include <sound/asound.h>
#include "packets-buffer.h"
* enum cip_out_flags - describes details of the streaming protocol
* @CIP_NONBLOCKING: In non-blocking mode, each packet contains
* sample_rate/8000 samples, with rounding up or down to adjust
* for clock skew and left-over fractional samples. This should
* be used if supported by the device.
* @CIP_BLOCKING: In blocking mode, each packet contains either zero or
* SYT_INTERVAL samples, with these two types alternating so that
* the overall sample rate comes out right.
* @CIP_HI_DUALWIRE: At rates above 96 kHz, pretend that the stream runs
* at half the actual sample rate with twice the number of channels;
* two samples of a channel are stored consecutively in the packet.
* Requires blocking mode and SYT_INTERVAL-aligned PCM buffer size.
enum cip_out_flags {
* enum cip_sfc - a stream's sample rate
enum cip_sfc {
CIP_SFC_32000 = 0,
CIP_SFC_44100 = 1,
CIP_SFC_48000 = 2,
CIP_SFC_88200 = 3,
CIP_SFC_96000 = 4,
CIP_SFC_176400 = 5,
CIP_SFC_192000 = 6,
struct fw_unit;
struct fw_iso_context;
struct snd_pcm_substream;
struct amdtp_out_stream {
struct fw_unit *unit;
enum cip_out_flags flags;
struct fw_iso_context *context;
struct mutex mutex;
enum cip_sfc sfc;
bool dual_wire;
unsigned int data_block_quadlets;
unsigned int pcm_channels;
unsigned int midi_ports;
void (*transfer_samples)(struct amdtp_out_stream *s,
struct snd_pcm_substream *pcm,
__be32 *buffer, unsigned int frames);
unsigned int syt_interval;
unsigned int transfer_delay;
unsigned int source_node_id_field;
struct iso_packets_buffer buffer;
struct snd_pcm_substream *pcm;
struct tasklet_struct period_tasklet;
int packet_index;
unsigned int data_block_counter;
unsigned int data_block_state;
unsigned int last_syt_offset;
unsigned int syt_offset_state;
unsigned int pcm_buffer_pointer;
unsigned int pcm_period_pointer;
bool pointer_flush;
int amdtp_out_stream_init(struct amdtp_out_stream *s, struct fw_unit *unit,
enum cip_out_flags flags);
void amdtp_out_stream_destroy(struct amdtp_out_stream *s);
void amdtp_out_stream_set_parameters(struct amdtp_out_stream *s,
unsigned int rate,
unsigned int pcm_channels,
unsigned int midi_ports);
unsigned int amdtp_out_stream_get_max_payload(struct amdtp_out_stream *s);
int amdtp_out_stream_start(struct amdtp_out_stream *s, int channel, int speed);
void amdtp_out_stream_update(struct amdtp_out_stream *s);
void amdtp_out_stream_stop(struct amdtp_out_stream *s);
void amdtp_out_stream_set_pcm_format(struct amdtp_out_stream *s,
snd_pcm_format_t format);
void amdtp_out_stream_pcm_prepare(struct amdtp_out_stream *s);
unsigned long amdtp_out_stream_pcm_pointer(struct amdtp_out_stream *s);
void amdtp_out_stream_pcm_abort(struct amdtp_out_stream *s);
extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT];
static inline bool amdtp_out_stream_running(struct amdtp_out_stream *s)
return !IS_ERR(s->context);
* amdtp_out_streaming_error - check for streaming error
* @s: the AMDTP output stream
* If this function returns true, the stream's packet queue has stopped due to
* an asynchronous error.
static inline bool amdtp_out_streaming_error(struct amdtp_out_stream *s)
return s->packet_index < 0;
* amdtp_out_stream_pcm_trigger - start/stop playback from a PCM device
* @s: the AMDTP output stream
* @pcm: the PCM device to be started, or %NULL to stop the current device
* Call this function on a running isochronous stream to enable the actual
* transmission of PCM data. This function should be called from the PCM
* device's .trigger callback.
static inline void amdtp_out_stream_pcm_trigger(struct amdtp_out_stream *s,
struct snd_pcm_substream *pcm)
ACCESS_ONCE(s->pcm) = pcm;
static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
return sfc & 1;