#ifndef SOUND_FIREWIRE_AMDTP_H_INCLUDED #define SOUND_FIREWIRE_AMDTP_H_INCLUDED #include <linux/interrupt.h> #include <linux/mutex.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. */ enum cip_out_flags { CIP_NONBLOCKING = 0, }; /** * 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, }; #define AMDTP_OUT_PCM_FORMAT_BITS (SNDRV_PCM_FMTBIT_S16 | \ SNDRV_PCM_FMTBIT_S32) 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; 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 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_rate(struct amdtp_out_stream *s, unsigned int rate); 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); /** * amdtp_out_stream_set_pcm - configure format of PCM samples * @s: the AMDTP output stream to be configured * @pcm_channels: the number of PCM samples in each data block, to be encoded * as AM824 multi-bit linear audio * * This function must not be called while the stream is running. */ static inline void amdtp_out_stream_set_pcm(struct amdtp_out_stream *s, unsigned int pcm_channels) { s->pcm_channels = pcm_channels; } /** * amdtp_out_stream_set_midi - configure format of MIDI data * @s: the AMDTP output stream to be configured * @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels) * * This function must not be called while the stream is running. */ static inline void amdtp_out_stream_set_midi(struct amdtp_out_stream *s, unsigned int midi_ports) { s->midi_ports = midi_ports; } /** * 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; } #endif