sound/firewire/amdtp.h

   1 #ifndef SOUND_FIREWIRE_AMDTP_H_INCLUDED
   2 #define SOUND_FIREWIRE_AMDTP_H_INCLUDED
   3
   4 #include <linux/interrupt.h>
   5 #include <linux/mutex.h>
   6 #include <linux/spinlock.h>
   7 #include "packets-buffer.h"
   8
   9 /**
  10  * enum cip_out_flags - describes details of the streaming protocol
  11  * @CIP_NONBLOCKING: In non-blocking mode, each packet contains
  12  *      sample_rate/8000 samples, with rounding up or down to adjust
  13  *      for clock skew and left-over fractional samples.  This should
  14  *      be used if supported by the device.
  15  */
  16 enum cip_out_flags {
  17         CIP_NONBLOCKING = 0,
  18 };
  19
  20 /**
  21  * enum cip_sfc - a stream's sample rate
  22  */
  23 enum cip_sfc {
  24         CIP_SFC_32000  = 0,
  25         CIP_SFC_44100  = 1,
  26         CIP_SFC_48000  = 2,
  27         CIP_SFC_88200  = 3,
  28         CIP_SFC_96000  = 4,
  29         CIP_SFC_176400 = 5,
  30         CIP_SFC_192000 = 6,
  31 };
  32
  33 #define AMDTP_OUT_PCM_FORMAT_BITS       (SNDRV_PCM_FMTBIT_S16 | \
  34                                          SNDRV_PCM_FMTBIT_S32)
  35
  36 struct fw_unit;
  37 struct fw_iso_context;
  38 struct snd_pcm_substream;
  39
  40 struct amdtp_out_stream {
  41         struct fw_unit *unit;
  42         enum cip_out_flags flags;
  43         struct fw_iso_context *context;
  44         struct mutex mutex;
  45
  46         enum cip_sfc sfc;
  47         unsigned int data_block_quadlets;
  48         unsigned int pcm_channels;
  49         unsigned int midi_ports;
  50         void (*transfer_samples)(struct amdtp_out_stream *s,
  51                                  struct snd_pcm_substream *pcm,
  52                                  __be32 *buffer, unsigned int frames);
  53
  54         unsigned int syt_interval;
  55         unsigned int source_node_id_field;
  56         struct iso_packets_buffer buffer;
  57
  58         struct snd_pcm_substream *pcm;
  59         struct tasklet_struct period_tasklet;
  60
  61         int packet_index;
  62         unsigned int data_block_counter;
  63
  64         unsigned int data_block_state;
  65
  66         unsigned int last_syt_offset;
  67         unsigned int syt_offset_state;
  68
  69         unsigned int pcm_buffer_pointer;
  70         unsigned int pcm_period_pointer;
  71         bool pointer_flush;
  72 };
  73
  74 int amdtp_out_stream_init(struct amdtp_out_stream *s, struct fw_unit *unit,
  75                           enum cip_out_flags flags);
  76 void amdtp_out_stream_destroy(struct amdtp_out_stream *s);
  77
  78 void amdtp_out_stream_set_rate(struct amdtp_out_stream *s, unsigned int rate);
  79 unsigned int amdtp_out_stream_get_max_payload(struct amdtp_out_stream *s);
  80
  81 int amdtp_out_stream_start(struct amdtp_out_stream *s, int channel, int speed);
  82 void amdtp_out_stream_update(struct amdtp_out_stream *s);
  83 void amdtp_out_stream_stop(struct amdtp_out_stream *s);
  84
  85 void amdtp_out_stream_set_pcm_format(struct amdtp_out_stream *s,
  86                                      snd_pcm_format_t format);
  87 void amdtp_out_stream_pcm_prepare(struct amdtp_out_stream *s);
  88 unsigned long amdtp_out_stream_pcm_pointer(struct amdtp_out_stream *s);
  89 void amdtp_out_stream_pcm_abort(struct amdtp_out_stream *s);
  90
  91 /**
  92  * amdtp_out_stream_set_pcm - configure format of PCM samples
  93  * @s: the AMDTP output stream to be configured
  94  * @pcm_channels: the number of PCM samples in each data block, to be encoded
  95  *                as AM824 multi-bit linear audio
  96  *
  97  * This function must not be called while the stream is running.
  98  */
  99 static inline void amdtp_out_stream_set_pcm(struct amdtp_out_stream *s,
 100                                             unsigned int pcm_channels)
 101 {
 102         s->pcm_channels = pcm_channels;
 103 }
 104
 105 /**
 106  * amdtp_out_stream_set_midi - configure format of MIDI data
 107  * @s: the AMDTP output stream to be configured
 108  * @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels)
 109  *
 110  * This function must not be called while the stream is running.
 111  */
 112 static inline void amdtp_out_stream_set_midi(struct amdtp_out_stream *s,
 113                                              unsigned int midi_ports)
 114 {
 115         s->midi_ports = midi_ports;
 116 }
 117
 118 /**
 119  * amdtp_out_streaming_error - check for streaming error
 120  * @s: the AMDTP output stream
 121  *
 122  * If this function returns true, the stream's packet queue has stopped due to
 123  * an asynchronous error.
 124  */
 125 static inline bool amdtp_out_streaming_error(struct amdtp_out_stream *s)
 126 {
 127         return s->packet_index < 0;
 128 }
 129
 130 /**
 131  * amdtp_out_stream_pcm_trigger - start/stop playback from a PCM device
 132  * @s: the AMDTP output stream
 133  * @pcm: the PCM device to be started, or %NULL to stop the current device
 134  *
 135  * Call this function on a running isochronous stream to enable the actual
 136  * transmission of PCM data.  This function should be called from the PCM
 137  * device's .trigger callback.
 138  */
 139 static inline void amdtp_out_stream_pcm_trigger(struct amdtp_out_stream *s,
 140                                                 struct snd_pcm_substream *pcm)
 141 {
 142         ACCESS_ONCE(s->pcm) = pcm;
 143 }
 144
 145 static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
 146 {
 147         return sfc & 1;
 148 }
 149
 150 #endif