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_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_SYNC_TO_DEVICE: In sync to device mode, time stamp in out packets is
  20  *      generated by in packets. Defaultly this driver generates timestamp.
  21  * @CIP_EMPTY_WITH_TAG0: Only for in-stream. Empty in-packets have TAG0.
  22  * @CIP_DBC_IS_END_EVENT: Only for in-stream. The value of dbc in an in-packet
  23  *      corresponds to the end of event in the packet. Out of IEC 61883.
  24  * @CIP_WRONG_DBS: Only for in-stream. The value of dbs is wrong in in-packets.
  25  *      The value of data_block_quadlets is used instead of reported value.
  26  * @CIP_SKIP_DBC_ZERO_CHECK: Only for in-stream.  Packets with zero in dbc is
  27  *      skipped for detecting discontinuity.
  28  * @CIP_SKIP_INIT_DBC_CHECK: Only for in-stream. The value of dbc in first
  29  *      packet is not continuous from an initial value.
  30  * @CIP_EMPTY_HAS_WRONG_DBC: Only for in-stream. The value of dbc in empty
  31  *      packet is wrong but the others are correct.
  32  */
  33 enum cip_flags {
  34         CIP_NONBLOCKING         = 0x00,
  35         CIP_BLOCKING            = 0x01,
  36         CIP_SYNC_TO_DEVICE      = 0x02,
  37         CIP_EMPTY_WITH_TAG0     = 0x04,
  38         CIP_DBC_IS_END_EVENT    = 0x08,
  39         CIP_WRONG_DBS           = 0x10,
  40         CIP_SKIP_DBC_ZERO_CHECK = 0x20,
  41         CIP_SKIP_INIT_DBC_CHECK = 0x40,
  42         CIP_EMPTY_HAS_WRONG_DBC = 0x80,
  43 };
  44
  45 /**
  46  * enum cip_sfc - supported Sampling Frequency Codes (SFCs)
  47  * @CIP_SFC_32000:   32,000 data blocks
  48  * @CIP_SFC_44100:   44,100 data blocks
  49  * @CIP_SFC_48000:   48,000 data blocks
  50  * @CIP_SFC_88200:   88,200 data blocks
  51  * @CIP_SFC_96000:   96,000 data blocks
  52  * @CIP_SFC_176400: 176,400 data blocks
  53  * @CIP_SFC_192000: 192,000 data blocks
  54  * @CIP_SFC_COUNT: the number of supported SFCs
  55  *
  56  * These values are used to show nominal Sampling Frequency Code in
  57  * Format Dependent Field (FDF) of AMDTP packet header. In IEC 61883-6:2002,
  58  * this code means the number of events per second. Actually the code
  59  * represents the number of data blocks transferred per second in an AMDTP
  60  * stream.
  61  *
  62  * In IEC 61883-6:2005, some extensions were added to support more types of
  63  * data such as 'One Bit LInear Audio', therefore the meaning of SFC became
  64  * different depending on the types.
  65  *
  66  * Currently our implementation is compatible with IEC 61883-6:2002.
  67  */
  68 enum cip_sfc {
  69         CIP_SFC_32000  = 0,
  70         CIP_SFC_44100  = 1,
  71         CIP_SFC_48000  = 2,
  72         CIP_SFC_88200  = 3,
  73         CIP_SFC_96000  = 4,
  74         CIP_SFC_176400 = 5,
  75         CIP_SFC_192000 = 6,
  76         CIP_SFC_COUNT
  77 };
  78
  79 #define AMDTP_IN_PCM_FORMAT_BITS        SNDRV_PCM_FMTBIT_S32
  80
  81 #define AMDTP_OUT_PCM_FORMAT_BITS       (SNDRV_PCM_FMTBIT_S16 | \
  82                                          SNDRV_PCM_FMTBIT_S32)
  83
  84
  85 /*
  86  * This module supports maximum 64 PCM channels for one PCM stream
  87  * This is for our convenience.
  88  */
  89 #define AMDTP_MAX_CHANNELS_FOR_PCM      64
  90
  91 /*
  92  * AMDTP packet can include channels for MIDI conformant data.
  93  * Each MIDI conformant data channel includes 8 MPX-MIDI data stream.
  94  * Each MPX-MIDI data stream includes one data stream from/to MIDI ports.
  95  *
  96  * This module supports maximum 1 MIDI conformant data channels.
  97  * Then this AMDTP packets can transfer maximum 8 MIDI data streams.
  98  */
  99 #define AMDTP_MAX_CHANNELS_FOR_MIDI     1
 100
 101 struct fw_unit;
 102 struct fw_iso_context;
 103 struct snd_pcm_substream;
 104 struct snd_pcm_runtime;
 105 struct snd_rawmidi_substream;
 106
 107 enum amdtp_stream_direction {
 108         AMDTP_OUT_STREAM = 0,
 109         AMDTP_IN_STREAM
 110 };
 111
 112 struct amdtp_stream {
 113         struct fw_unit *unit;
 114         enum cip_flags flags;
 115         enum amdtp_stream_direction direction;
 116         struct fw_iso_context *context;
 117         struct mutex mutex;
 118
 119         enum cip_sfc sfc;
 120         unsigned int data_block_quadlets;
 121         unsigned int pcm_channels;
 122         unsigned int midi_ports;
 123         void (*transfer_samples)(struct amdtp_stream *s,
 124                                  struct snd_pcm_substream *pcm,
 125                                  __be32 *buffer, unsigned int frames);
 126         u8 pcm_positions[AMDTP_MAX_CHANNELS_FOR_PCM];
 127         u8 midi_position;
 128
 129         unsigned int syt_interval;
 130         unsigned int transfer_delay;
 131         unsigned int source_node_id_field;
 132         struct iso_packets_buffer buffer;
 133
 134         struct snd_pcm_substream *pcm;
 135         struct tasklet_struct period_tasklet;
 136
 137         int packet_index;
 138         unsigned int data_block_counter;
 139
 140         unsigned int data_block_state;
 141
 142         unsigned int last_syt_offset;
 143         unsigned int syt_offset_state;
 144
 145         unsigned int pcm_buffer_pointer;
 146         unsigned int pcm_period_pointer;
 147         bool pointer_flush;
 148         bool double_pcm_frames;
 149
 150         struct snd_rawmidi_substream *midi[AMDTP_MAX_CHANNELS_FOR_MIDI * 8];
 151
 152         /* quirk: fixed interval of dbc between previos/current packets. */
 153         unsigned int tx_dbc_interval;
 154
 155         /* quirk: the first count of data blocks in an rx packet for MIDI */
 156         unsigned int rx_blocks_for_midi;
 157
 158         bool callbacked;
 159         wait_queue_head_t callback_wait;
 160         struct amdtp_stream *sync_slave;
 161 };
 162
 163 int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
 164                       enum amdtp_stream_direction dir,
 165                       enum cip_flags flags);
 166 void amdtp_stream_destroy(struct amdtp_stream *s);
 167
 168 void amdtp_stream_set_parameters(struct amdtp_stream *s,
 169                                  unsigned int rate,
 170                                  unsigned int pcm_channels,
 171                                  unsigned int midi_ports);
 172 unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s);
 173
 174 int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed);
 175 void amdtp_stream_update(struct amdtp_stream *s);
 176 void amdtp_stream_stop(struct amdtp_stream *s);
 177
 178 int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s,
 179                                         struct snd_pcm_runtime *runtime);
 180 void amdtp_stream_set_pcm_format(struct amdtp_stream *s,
 181                                  snd_pcm_format_t format);
 182 void amdtp_stream_pcm_prepare(struct amdtp_stream *s);
 183 unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s);
 184 void amdtp_stream_pcm_abort(struct amdtp_stream *s);
 185
 186 extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT];
 187 extern const unsigned int amdtp_rate_table[CIP_SFC_COUNT];
 188
 189 /**
 190  * amdtp_stream_running - check stream is running or not
 191  * @s: the AMDTP stream
 192  *
 193  * If this function returns true, the stream is running.
 194  */
 195 static inline bool amdtp_stream_running(struct amdtp_stream *s)
 196 {
 197         return !IS_ERR(s->context);
 198 }
 199
 200 /**
 201  * amdtp_streaming_error - check for streaming error
 202  * @s: the AMDTP stream
 203  *
 204  * If this function returns true, the stream's packet queue has stopped due to
 205  * an asynchronous error.
 206  */
 207 static inline bool amdtp_streaming_error(struct amdtp_stream *s)
 208 {
 209         return s->packet_index < 0;
 210 }
 211
 212 /**
 213  * amdtp_stream_pcm_running - check PCM substream is running or not
 214  * @s: the AMDTP stream
 215  *
 216  * If this function returns true, PCM substream in the AMDTP stream is running.
 217  */
 218 static inline bool amdtp_stream_pcm_running(struct amdtp_stream *s)
 219 {
 220         return !!s->pcm;
 221 }
 222
 223 /**
 224  * amdtp_stream_pcm_trigger - start/stop playback from a PCM device
 225  * @s: the AMDTP stream
 226  * @pcm: the PCM device to be started, or %NULL to stop the current device
 227  *
 228  * Call this function on a running isochronous stream to enable the actual
 229  * transmission of PCM data.  This function should be called from the PCM
 230  * device's .trigger callback.
 231  */
 232 static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s,
 233                                             struct snd_pcm_substream *pcm)
 234 {
 235         ACCESS_ONCE(s->pcm) = pcm;
 236 }
 237
 238 /**
 239  * amdtp_stream_midi_trigger - start/stop playback/capture with a MIDI device
 240  * @s: the AMDTP stream
 241  * @port: index of MIDI port
 242  * @midi: the MIDI device to be started, or %NULL to stop the current device
 243  *
 244  * Call this function on a running isochronous stream to enable the actual
 245  * transmission of MIDI data.  This function should be called from the MIDI
 246  * device's .trigger callback.
 247  */
 248 static inline void amdtp_stream_midi_trigger(struct amdtp_stream *s,
 249                                              unsigned int port,
 250                                              struct snd_rawmidi_substream *midi)
 251 {
 252         if (port < s->midi_ports)
 253                 ACCESS_ONCE(s->midi[port]) = midi;
 254 }
 255
 256 static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
 257 {
 258         return sfc & 1;
 259 }
 260
 261 static inline void amdtp_stream_set_sync(enum cip_flags sync_mode,
 262                                          struct amdtp_stream *master,
 263                                          struct amdtp_stream *slave)
 264 {
 265         if (sync_mode == CIP_SYNC_TO_DEVICE) {
 266                 master->flags |= CIP_SYNC_TO_DEVICE;
 267                 slave->flags |= CIP_SYNC_TO_DEVICE;
 268                 master->sync_slave = slave;
 269         } else {
 270                 master->flags &= ~CIP_SYNC_TO_DEVICE;
 271                 slave->flags &= ~CIP_SYNC_TO_DEVICE;
 272                 master->sync_slave = NULL;
 273         }
 274
 275         slave->sync_slave = NULL;
 276 }
 277
 278 /**
 279  * amdtp_stream_wait_callback - sleep till callbacked or timeout
 280  * @s: the AMDTP stream
 281  * @timeout: msec till timeout
 282  *
 283  * If this function return false, the AMDTP stream should be stopped.
 284  */
 285 static inline bool amdtp_stream_wait_callback(struct amdtp_stream *s,
 286                                               unsigned int timeout)
 287 {
 288         return wait_event_timeout(s->callback_wait,
 289                                   s->callbacked == true,
 290                                   msecs_to_jiffies(timeout)) > 0;
 291 }
 292
 293 #endif