| #ifndef SOUND_FIREWIRE_AMDTP_H_INCLUDED |
| #define SOUND_FIREWIRE_AMDTP_H_INCLUDED |
| |
| #include <linux/err.h> |
| #include <linux/interrupt.h> |
| #include <linux/mutex.h> |
| #include <sound/asound.h> |
| #include "packets-buffer.h" |
| |
| /** |
| * enum cip_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_flags { |
| CIP_NONBLOCKING = 0x00, |
| CIP_BLOCKING = 0x01, |
| CIP_HI_DUALWIRE = 0x02, |
| }; |
| |
| /** |
| * 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, |
| CIP_SFC_COUNT |
| }; |
| |
| #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; |
| |
| enum amdtp_stream_direction { |
| AMDTP_OUT_STREAM = 0, |
| AMDTP_IN_STREAM |
| }; |
| |
| struct amdtp_stream { |
| struct fw_unit *unit; |
| enum cip_flags flags; |
| enum amdtp_stream_direction direction; |
| 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_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_stream_init(struct amdtp_stream *s, struct fw_unit *unit, |
| enum amdtp_stream_direction dir, |
| enum cip_flags flags); |
| void amdtp_stream_destroy(struct amdtp_stream *s); |
| |
| void amdtp_stream_set_parameters(struct amdtp_stream *s, |
| unsigned int rate, |
| unsigned int pcm_channels, |
| unsigned int midi_ports); |
| unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s); |
| |
| int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed); |
| void amdtp_stream_update(struct amdtp_stream *s); |
| void amdtp_stream_stop(struct amdtp_stream *s); |
| |
| void amdtp_stream_set_pcm_format(struct amdtp_stream *s, |
| snd_pcm_format_t format); |
| void amdtp_stream_pcm_prepare(struct amdtp_stream *s); |
| unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s); |
| void amdtp_stream_pcm_abort(struct amdtp_stream *s); |
| |
| extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT]; |
| |
| /** |
| * amdtp_stream_running - check stream is running or not |
| * @s: the AMDTP stream |
| * |
| * If this function returns true, the stream is running. |
| */ |
| static inline bool amdtp_stream_running(struct amdtp_stream *s) |
| { |
| return !IS_ERR(s->context); |
| } |
| |
| /** |
| * amdtp_streaming_error - check for streaming error |
| * @s: the AMDTP stream |
| * |
| * If this function returns true, the stream's packet queue has stopped due to |
| * an asynchronous error. |
| */ |
| static inline bool amdtp_streaming_error(struct amdtp_stream *s) |
| { |
| return s->packet_index < 0; |
| } |
| |
| /** |
| * amdtp_stream_pcm_trigger - start/stop playback from a PCM device |
| * @s: the AMDTP 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_stream_pcm_trigger(struct amdtp_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 |