sound/firewire/amdtp.h

   1 #ifndef SOUND_FIREWIRE_AMDTP_H_INCLUDED
   2 #define SOUND_FIREWIRE_AMDTP_H_INCLUDED
   3
   4 #include <linux/err.h>
   5 #include <linux/interrupt.h>
   6 #include <linux/mutex.h>
   7 #include <sound/asound.h>
   8 #include "packets-buffer.h"
   9
  10 /**
  11  * enum cip_out_flags - describes details of the streaming protocol
  12  * @CIP_NONBLOCKING: In non-blocking mode, each packet contains
  13  *      sample_rate/8000 samples, with rounding up or down to adjust
  14  *      for clock skew and left-over fractional samples.  This should
  15  *      be used if supported by the device.
  16  * @CIP_BLOCKING: In blocking mode, each packet contains either zero or
  17  *      SYT_INTERVAL samples, with these two types alternating so that
  18  *      the overall sample rate comes out right.
  19  * @CIP_HI_DUALWIRE: At rates above 96 kHz, pretend that the stream runs
  20  *      at half the actual sample rate with twice the number of channels;
  21  *      two samples of a channel are stored consecutively in the packet.
  22  *      Requires blocking mode and SYT_INTERVAL-aligned PCM buffer size.
  23  */
  24 enum cip_out_flags {
  25         CIP_NONBLOCKING = 0x00,
  26         CIP_BLOCKING    = 0x01,
  27         CIP_HI_DUALWIRE = 0x02,
  28 };
  29
  30 /**
  31  * enum cip_sfc - a stream's sample rate
  32  */
  33 enum cip_sfc {
  34         CIP_SFC_32000  = 0,
  35         CIP_SFC_44100  = 1,
  36         CIP_SFC_48000  = 2,
  37         CIP_SFC_88200  = 3,
  38         CIP_SFC_96000  = 4,
  39         CIP_SFC_176400 = 5,
  40         CIP_SFC_192000 = 6,
  41         CIP_SFC_COUNT
  42 };
  43
  44 #define AMDTP_OUT_PCM_FORMAT_BITS       (SNDRV_PCM_FMTBIT_S16 | \
  45                                          SNDRV_PCM_FMTBIT_S32)
  46
  47 struct fw_unit;
  48 struct fw_iso_context;
  49 struct snd_pcm_substream;
  50
  51 struct amdtp_out_stream {
  52         struct fw_unit *unit;
  53         enum cip_out_flags flags;
  54         struct fw_iso_context *context;
  55         struct mutex mutex;
  56
  57         enum cip_sfc sfc;
  58         bool dual_wire;
  59         unsigned int data_block_quadlets;
  60         unsigned int pcm_channels;
  61         unsigned int midi_ports;
  62         void (*transfer_samples)(struct amdtp_out_stream *s,
  63                                  struct snd_pcm_substream *pcm,
  64                                  __be32 *buffer, unsigned int frames);
  65
  66         unsigned int syt_interval;
  67         unsigned int transfer_delay;
  68         unsigned int source_node_id_field;
  69         struct iso_packets_buffer buffer;
  70
  71         struct snd_pcm_substream *pcm;
  72         struct tasklet_struct period_tasklet;
  73
  74         int packet_index;
  75         unsigned int data_block_counter;
  76
  77         unsigned int data_block_state;
  78
  79         unsigned int last_syt_offset;
  80         unsigned int syt_offset_state;
  81
  82         unsigned int pcm_buffer_pointer;
  83         unsigned int pcm_period_pointer;
  84         bool pointer_flush;
  85 };
  86
  87 int amdtp_out_stream_init(struct amdtp_out_stream *s, struct fw_unit *unit,
  88                           enum cip_out_flags flags);
  89 void amdtp_out_stream_destroy(struct amdtp_out_stream *s);
  90
  91 void amdtp_out_stream_set_parameters(struct amdtp_out_stream *s,
  92                                      unsigned int rate,
  93                                      unsigned int pcm_channels,
  94                                      unsigned int midi_ports);
  95 unsigned int amdtp_out_stream_get_max_payload(struct amdtp_out_stream *s);
  96
  97 int amdtp_out_stream_start(struct amdtp_out_stream *s, int channel, int speed);
  98 void amdtp_out_stream_update(struct amdtp_out_stream *s);
  99 void amdtp_out_stream_stop(struct amdtp_out_stream *s);
 100
 101 void amdtp_out_stream_set_pcm_format(struct amdtp_out_stream *s,
 102                                      snd_pcm_format_t format);
 103 void amdtp_out_stream_pcm_prepare(struct amdtp_out_stream *s);
 104 unsigned long amdtp_out_stream_pcm_pointer(struct amdtp_out_stream *s);
 105 void amdtp_out_stream_pcm_abort(struct amdtp_out_stream *s);
 106
 107 extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT];
 108
 109 static inline bool amdtp_out_stream_running(struct amdtp_out_stream *s)
 110 {
 111         return !IS_ERR(s->context);
 112 }
 113
 114 /**
 115  * amdtp_out_streaming_error - check for streaming error
 116  * @s: the AMDTP output stream
 117  *
 118  * If this function returns true, the stream's packet queue has stopped due to
 119  * an asynchronous error.
 120  */
 121 static inline bool amdtp_out_streaming_error(struct amdtp_out_stream *s)
 122 {
 123         return s->packet_index < 0;
 124 }
 125
 126 /**
 127  * amdtp_out_stream_pcm_trigger - start/stop playback from a PCM device
 128  * @s: the AMDTP output stream
 129  * @pcm: the PCM device to be started, or %NULL to stop the current device
 130  *
 131  * Call this function on a running isochronous stream to enable the actual
 132  * transmission of PCM data.  This function should be called from the PCM
 133  * device's .trigger callback.
 134  */
 135 static inline void amdtp_out_stream_pcm_trigger(struct amdtp_out_stream *s,
 136                                                 struct snd_pcm_substream *pcm)
 137 {
 138         ACCESS_ONCE(s->pcm) = pcm;
 139 }
 140
 141 static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
 142 {
 143         return sfc & 1;
 144 }
 145
 146 #endif