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  * @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 - a stream's sample rate
  47  */
  48 enum cip_sfc {
  49         CIP_SFC_32000  = 0,
  50         CIP_SFC_44100  = 1,
  51         CIP_SFC_48000  = 2,
  52         CIP_SFC_88200  = 3,
  53         CIP_SFC_96000  = 4,
  54         CIP_SFC_176400 = 5,
  55         CIP_SFC_192000 = 6,
  56         CIP_SFC_COUNT
  57 };
  58
  59 #define AMDTP_IN_PCM_FORMAT_BITS        SNDRV_PCM_FMTBIT_S32
  60
  61 #define AMDTP_OUT_PCM_FORMAT_BITS       (SNDRV_PCM_FMTBIT_S16 | \
  62                                          SNDRV_PCM_FMTBIT_S32)
  63
  64
  65 /*
  66  * This module supports maximum 64 PCM channels for one PCM stream
  67  * This is for our convenience.
  68  */
  69 #define AMDTP_MAX_CHANNELS_FOR_PCM      64
  70
  71 /*
  72  * AMDTP packet can include channels for MIDI conformant data.
  73  * Each MIDI conformant data channel includes 8 MPX-MIDI data stream.
  74  * Each MPX-MIDI data stream includes one data stream from/to MIDI ports.
  75  *
  76  * This module supports maximum 1 MIDI conformant data channels.
  77  * Then this AMDTP packets can transfer maximum 8 MIDI data streams.
  78  */
  79 #define AMDTP_MAX_CHANNELS_FOR_MIDI     1
  80
  81 struct fw_unit;
  82 struct fw_iso_context;
  83 struct snd_pcm_substream;
  84 struct snd_pcm_runtime;
  85 struct snd_rawmidi_substream;
  86
  87 enum amdtp_stream_direction {
  88         AMDTP_OUT_STREAM = 0,
  89         AMDTP_IN_STREAM
  90 };
  91
  92 struct amdtp_stream {
  93         struct fw_unit *unit;
  94         enum cip_flags flags;
  95         enum amdtp_stream_direction direction;
  96         struct fw_iso_context *context;
  97         struct mutex mutex;
  98
  99         enum cip_sfc sfc;
 100         unsigned int data_block_quadlets;
 101         unsigned int pcm_channels;
 102         unsigned int midi_ports;
 103         void (*transfer_samples)(struct amdtp_stream *s,
 104                                  struct snd_pcm_substream *pcm,
 105                                  __be32 *buffer, unsigned int frames);
 106         u8 pcm_positions[AMDTP_MAX_CHANNELS_FOR_PCM];
 107         u8 midi_position;
 108
 109         unsigned int syt_interval;
 110         unsigned int transfer_delay;
 111         unsigned int source_node_id_field;
 112         struct iso_packets_buffer buffer;
 113
 114         struct snd_pcm_substream *pcm;
 115         struct tasklet_struct period_tasklet;
 116
 117         int packet_index;
 118         unsigned int data_block_counter;
 119
 120         unsigned int data_block_state;
 121
 122         unsigned int last_syt_offset;
 123         unsigned int syt_offset_state;
 124
 125         unsigned int pcm_buffer_pointer;
 126         unsigned int pcm_period_pointer;
 127         bool pointer_flush;
 128
 129         struct snd_rawmidi_substream *midi[AMDTP_MAX_CHANNELS_FOR_MIDI * 8];
 130
 131         /* quirk: fixed interval of dbc between previos/current packets. */
 132         unsigned int tx_dbc_interval;
 133
 134         /* quirk: the first count of data blocks in an rx packet for MIDI */
 135         unsigned int rx_blocks_for_midi;
 136
 137         bool callbacked;
 138         wait_queue_head_t callback_wait;
 139         struct amdtp_stream *sync_slave;
 140 };
 141
 142 int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
 143                       enum amdtp_stream_direction dir,
 144                       enum cip_flags flags);
 145 void amdtp_stream_destroy(struct amdtp_stream *s);
 146
 147 void amdtp_stream_set_parameters(struct amdtp_stream *s,
 148                                  unsigned int rate,
 149                                  unsigned int pcm_channels,
 150                                  unsigned int midi_ports);
 151 unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s);
 152
 153 int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed);
 154 void amdtp_stream_update(struct amdtp_stream *s);
 155 void amdtp_stream_stop(struct amdtp_stream *s);
 156
 157 int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s,
 158                                         struct snd_pcm_runtime *runtime);
 159 void amdtp_stream_set_pcm_format(struct amdtp_stream *s,
 160                                  snd_pcm_format_t format);
 161 void amdtp_stream_pcm_prepare(struct amdtp_stream *s);
 162 unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s);
 163 void amdtp_stream_pcm_abort(struct amdtp_stream *s);
 164
 165 extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT];
 166 extern const unsigned int amdtp_rate_table[CIP_SFC_COUNT];
 167
 168 /**
 169  * amdtp_stream_running - check stream is running or not
 170  * @s: the AMDTP stream
 171  *
 172  * If this function returns true, the stream is running.
 173  */
 174 static inline bool amdtp_stream_running(struct amdtp_stream *s)
 175 {
 176         return !IS_ERR(s->context);
 177 }
 178
 179 /**
 180  * amdtp_streaming_error - check for streaming error
 181  * @s: the AMDTP stream
 182  *
 183  * If this function returns true, the stream's packet queue has stopped due to
 184  * an asynchronous error.
 185  */
 186 static inline bool amdtp_streaming_error(struct amdtp_stream *s)
 187 {
 188         return s->packet_index < 0;
 189 }
 190
 191 /**
 192  * amdtp_stream_pcm_running - check PCM substream is running or not
 193  * @s: the AMDTP stream
 194  *
 195  * If this function returns true, PCM substream in the AMDTP stream is running.
 196  */
 197 static inline bool amdtp_stream_pcm_running(struct amdtp_stream *s)
 198 {
 199         return !!s->pcm;
 200 }
 201
 202 /**
 203  * amdtp_stream_pcm_trigger - start/stop playback from a PCM device
 204  * @s: the AMDTP stream
 205  * @pcm: the PCM device to be started, or %NULL to stop the current device
 206  *
 207  * Call this function on a running isochronous stream to enable the actual
 208  * transmission of PCM data.  This function should be called from the PCM
 209  * device's .trigger callback.
 210  */
 211 static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s,
 212                                             struct snd_pcm_substream *pcm)
 213 {
 214         ACCESS_ONCE(s->pcm) = pcm;
 215 }
 216
 217 /**
 218  * amdtp_stream_midi_trigger - start/stop playback/capture with a MIDI device
 219  * @s: the AMDTP stream
 220  * @port: index of MIDI port
 221  * @midi: the MIDI device to be started, or %NULL to stop the current device
 222  *
 223  * Call this function on a running isochronous stream to enable the actual
 224  * transmission of MIDI data.  This function should be called from the MIDI
 225  * device's .trigger callback.
 226  */
 227 static inline void amdtp_stream_midi_trigger(struct amdtp_stream *s,
 228                                              unsigned int port,
 229                                              struct snd_rawmidi_substream *midi)
 230 {
 231         if (port < s->midi_ports)
 232                 ACCESS_ONCE(s->midi[port]) = midi;
 233 }
 234
 235 static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
 236 {
 237         return sfc & 1;
 238 }
 239
 240 static inline void amdtp_stream_set_sync(enum cip_flags sync_mode,
 241                                          struct amdtp_stream *master,
 242                                          struct amdtp_stream *slave)
 243 {
 244         if (sync_mode == CIP_SYNC_TO_DEVICE) {
 245                 master->flags |= CIP_SYNC_TO_DEVICE;
 246                 slave->flags |= CIP_SYNC_TO_DEVICE;
 247                 master->sync_slave = slave;
 248         } else {
 249                 master->flags &= ~CIP_SYNC_TO_DEVICE;
 250                 slave->flags &= ~CIP_SYNC_TO_DEVICE;
 251                 master->sync_slave = NULL;
 252         }
 253
 254         slave->sync_slave = NULL;
 255 }
 256
 257 /**
 258  * amdtp_stream_wait_callback - sleep till callbacked or timeout
 259  * @s: the AMDTP stream
 260  * @timeout: msec till timeout
 261  *
 262  * If this function return false, the AMDTP stream should be stopped.
 263  */
 264 static inline bool amdtp_stream_wait_callback(struct amdtp_stream *s,
 265                                               unsigned int timeout)
 266 {
 267         return wait_event_timeout(s->callback_wait,
 268                                   s->callbacked == true,
 269                                   msecs_to_jiffies(timeout)) > 0;
 270 }
 271
 272 #endif