1 #ifndef SOUND_FIREWIRE_AMDTP_H_INCLUDED
2 #define SOUND_FIREWIRE_AMDTP_H_INCLUDED
5 #include <linux/interrupt.h>
6 #include <linux/mutex.h>
7 #include <sound/asound.h>
8 #include "packets-buffer.h"
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.
34 CIP_NONBLOCKING = 0x00,
36 CIP_SYNC_TO_DEVICE = 0x02,
37 CIP_EMPTY_WITH_TAG0 = 0x04,
38 CIP_DBC_IS_END_EVENT = 0x08,
40 CIP_SKIP_DBC_ZERO_CHECK = 0x20,
41 CIP_SKIP_INIT_DBC_CHECK = 0x40,
42 CIP_EMPTY_HAS_WRONG_DBC = 0x80,
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
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
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.
66 * Currently our implementation is compatible with IEC 61883-6:2002.
79 #define AMDTP_IN_PCM_FORMAT_BITS SNDRV_PCM_FMTBIT_S32
81 #define AMDTP_OUT_PCM_FORMAT_BITS (SNDRV_PCM_FMTBIT_S16 | \
86 * This module supports maximum 64 PCM channels for one PCM stream
87 * This is for our convenience.
89 #define AMDTP_MAX_CHANNELS_FOR_PCM 64
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.
96 * This module supports maximum 1 MIDI conformant data channels.
97 * Then this AMDTP packets can transfer maximum 8 MIDI data streams.
99 #define AMDTP_MAX_CHANNELS_FOR_MIDI 1
102 struct fw_iso_context;
103 struct snd_pcm_substream;
104 struct snd_pcm_runtime;
105 struct snd_rawmidi_substream;
107 enum amdtp_stream_direction {
108 AMDTP_OUT_STREAM = 0,
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;
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];
129 unsigned int syt_interval;
130 unsigned int transfer_delay;
131 unsigned int source_node_id_field;
132 struct iso_packets_buffer buffer;
134 struct snd_pcm_substream *pcm;
135 struct tasklet_struct period_tasklet;
138 unsigned int data_block_counter;
140 unsigned int data_block_state;
142 unsigned int last_syt_offset;
143 unsigned int syt_offset_state;
145 unsigned int pcm_buffer_pointer;
146 unsigned int pcm_period_pointer;
148 bool double_pcm_frames;
150 struct snd_rawmidi_substream *midi[AMDTP_MAX_CHANNELS_FOR_MIDI * 8];
152 int midi_fifo_used[AMDTP_MAX_CHANNELS_FOR_MIDI * 8];
154 /* quirk: fixed interval of dbc between previos/current packets. */
155 unsigned int tx_dbc_interval;
158 wait_queue_head_t callback_wait;
159 struct amdtp_stream *sync_slave;
162 int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
163 enum amdtp_stream_direction dir,
164 enum cip_flags flags);
165 void amdtp_stream_destroy(struct amdtp_stream *s);
167 void amdtp_stream_set_parameters(struct amdtp_stream *s,
169 unsigned int pcm_channels,
170 unsigned int midi_ports);
171 unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s);
173 int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed);
174 void amdtp_stream_update(struct amdtp_stream *s);
175 void amdtp_stream_stop(struct amdtp_stream *s);
177 int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s,
178 struct snd_pcm_runtime *runtime);
179 void amdtp_stream_set_pcm_format(struct amdtp_stream *s,
180 snd_pcm_format_t format);
181 void amdtp_stream_pcm_prepare(struct amdtp_stream *s);
182 unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s);
183 void amdtp_stream_pcm_abort(struct amdtp_stream *s);
185 extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT];
186 extern const unsigned int amdtp_rate_table[CIP_SFC_COUNT];
189 * amdtp_stream_running - check stream is running or not
190 * @s: the AMDTP stream
192 * If this function returns true, the stream is running.
194 static inline bool amdtp_stream_running(struct amdtp_stream *s)
196 return !IS_ERR(s->context);
200 * amdtp_streaming_error - check for streaming error
201 * @s: the AMDTP stream
203 * If this function returns true, the stream's packet queue has stopped due to
204 * an asynchronous error.
206 static inline bool amdtp_streaming_error(struct amdtp_stream *s)
208 return s->packet_index < 0;
212 * amdtp_stream_pcm_running - check PCM substream is running or not
213 * @s: the AMDTP stream
215 * If this function returns true, PCM substream in the AMDTP stream is running.
217 static inline bool amdtp_stream_pcm_running(struct amdtp_stream *s)
223 * amdtp_stream_pcm_trigger - start/stop playback from a PCM device
224 * @s: the AMDTP stream
225 * @pcm: the PCM device to be started, or %NULL to stop the current device
227 * Call this function on a running isochronous stream to enable the actual
228 * transmission of PCM data. This function should be called from the PCM
229 * device's .trigger callback.
231 static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s,
232 struct snd_pcm_substream *pcm)
234 ACCESS_ONCE(s->pcm) = pcm;
238 * amdtp_stream_midi_trigger - start/stop playback/capture with a MIDI device
239 * @s: the AMDTP stream
240 * @port: index of MIDI port
241 * @midi: the MIDI device to be started, or %NULL to stop the current device
243 * Call this function on a running isochronous stream to enable the actual
244 * transmission of MIDI data. This function should be called from the MIDI
245 * device's .trigger callback.
247 static inline void amdtp_stream_midi_trigger(struct amdtp_stream *s,
249 struct snd_rawmidi_substream *midi)
251 if (port < s->midi_ports)
252 ACCESS_ONCE(s->midi[port]) = midi;
255 static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
260 static inline void amdtp_stream_set_sync(enum cip_flags sync_mode,
261 struct amdtp_stream *master,
262 struct amdtp_stream *slave)
264 if (sync_mode == CIP_SYNC_TO_DEVICE) {
265 master->flags |= CIP_SYNC_TO_DEVICE;
266 slave->flags |= CIP_SYNC_TO_DEVICE;
267 master->sync_slave = slave;
269 master->flags &= ~CIP_SYNC_TO_DEVICE;
270 slave->flags &= ~CIP_SYNC_TO_DEVICE;
271 master->sync_slave = NULL;
274 slave->sync_slave = NULL;
278 * amdtp_stream_wait_callback - sleep till callbacked or timeout
279 * @s: the AMDTP stream
280 * @timeout: msec till timeout
282 * If this function return false, the AMDTP stream should be stopped.
284 static inline bool amdtp_stream_wait_callback(struct amdtp_stream *s,
285 unsigned int timeout)
287 return wait_event_timeout(s->callback_wait,
288 s->callbacked == true,
289 msecs_to_jiffies(timeout)) > 0;