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.
32 * @CIP_JUMBO_PAYLOAD: Only for in-stream. The number of data blocks in an
33 * packet is larger than IEC 61883-6 defines. Current implementation
34 * allows 5 times as large as IEC 61883-6 defines.
37 CIP_NONBLOCKING = 0x00,
39 CIP_SYNC_TO_DEVICE = 0x02,
40 CIP_EMPTY_WITH_TAG0 = 0x04,
41 CIP_DBC_IS_END_EVENT = 0x08,
43 CIP_SKIP_DBC_ZERO_CHECK = 0x20,
44 CIP_SKIP_INIT_DBC_CHECK = 0x40,
45 CIP_EMPTY_HAS_WRONG_DBC = 0x80,
46 CIP_JUMBO_PAYLOAD = 0x100,
50 * enum cip_sfc - supported Sampling Frequency Codes (SFCs)
51 * @CIP_SFC_32000: 32,000 data blocks
52 * @CIP_SFC_44100: 44,100 data blocks
53 * @CIP_SFC_48000: 48,000 data blocks
54 * @CIP_SFC_88200: 88,200 data blocks
55 * @CIP_SFC_96000: 96,000 data blocks
56 * @CIP_SFC_176400: 176,400 data blocks
57 * @CIP_SFC_192000: 192,000 data blocks
58 * @CIP_SFC_COUNT: the number of supported SFCs
60 * These values are used to show nominal Sampling Frequency Code in
61 * Format Dependent Field (FDF) of AMDTP packet header. In IEC 61883-6:2002,
62 * this code means the number of events per second. Actually the code
63 * represents the number of data blocks transferred per second in an AMDTP
66 * In IEC 61883-6:2005, some extensions were added to support more types of
67 * data such as 'One Bit LInear Audio', therefore the meaning of SFC became
68 * different depending on the types.
70 * Currently our implementation is compatible with IEC 61883-6:2002.
83 #define AMDTP_IN_PCM_FORMAT_BITS SNDRV_PCM_FMTBIT_S32
85 #define AMDTP_OUT_PCM_FORMAT_BITS (SNDRV_PCM_FMTBIT_S16 | \
90 * This module supports maximum 64 PCM channels for one PCM stream
91 * This is for our convenience.
93 #define AMDTP_MAX_CHANNELS_FOR_PCM 64
96 * AMDTP packet can include channels for MIDI conformant data.
97 * Each MIDI conformant data channel includes 8 MPX-MIDI data stream.
98 * Each MPX-MIDI data stream includes one data stream from/to MIDI ports.
100 * This module supports maximum 1 MIDI conformant data channels.
101 * Then this AMDTP packets can transfer maximum 8 MIDI data streams.
103 #define AMDTP_MAX_CHANNELS_FOR_MIDI 1
106 struct fw_iso_context;
107 struct snd_pcm_substream;
108 struct snd_pcm_runtime;
109 struct snd_rawmidi_substream;
111 enum amdtp_stream_direction {
112 AMDTP_OUT_STREAM = 0,
116 struct amdtp_stream {
117 struct fw_unit *unit;
118 enum cip_flags flags;
119 enum amdtp_stream_direction direction;
120 struct fw_iso_context *context;
124 unsigned int data_block_quadlets;
125 unsigned int pcm_channels;
126 unsigned int midi_ports;
127 void (*transfer_samples)(struct amdtp_stream *s,
128 struct snd_pcm_substream *pcm,
129 __be32 *buffer, unsigned int frames);
130 u8 pcm_positions[AMDTP_MAX_CHANNELS_FOR_PCM];
133 unsigned int syt_interval;
134 unsigned int transfer_delay;
135 unsigned int source_node_id_field;
136 struct iso_packets_buffer buffer;
138 struct snd_pcm_substream *pcm;
139 struct tasklet_struct period_tasklet;
142 unsigned int data_block_counter;
144 unsigned int data_block_state;
146 unsigned int last_syt_offset;
147 unsigned int syt_offset_state;
149 unsigned int pcm_buffer_pointer;
150 unsigned int pcm_period_pointer;
152 bool double_pcm_frames;
154 struct snd_rawmidi_substream *midi[AMDTP_MAX_CHANNELS_FOR_MIDI * 8];
156 int midi_fifo_used[AMDTP_MAX_CHANNELS_FOR_MIDI * 8];
158 /* quirk: fixed interval of dbc between previos/current packets. */
159 unsigned int tx_dbc_interval;
160 /* quirk: indicate the value of dbc field in a first packet. */
161 unsigned int tx_first_dbc;
164 wait_queue_head_t callback_wait;
165 struct amdtp_stream *sync_slave;
168 int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
169 enum amdtp_stream_direction dir,
170 enum cip_flags flags);
171 void amdtp_stream_destroy(struct amdtp_stream *s);
173 void amdtp_stream_set_parameters(struct amdtp_stream *s,
175 unsigned int pcm_channels,
176 unsigned int midi_ports);
177 unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s);
179 int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed);
180 void amdtp_stream_update(struct amdtp_stream *s);
181 void amdtp_stream_stop(struct amdtp_stream *s);
183 int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s,
184 struct snd_pcm_runtime *runtime);
185 void amdtp_stream_set_pcm_format(struct amdtp_stream *s,
186 snd_pcm_format_t format);
187 void amdtp_stream_pcm_prepare(struct amdtp_stream *s);
188 unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s);
189 void amdtp_stream_pcm_abort(struct amdtp_stream *s);
191 extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT];
192 extern const unsigned int amdtp_rate_table[CIP_SFC_COUNT];
195 * amdtp_stream_running - check stream is running or not
196 * @s: the AMDTP stream
198 * If this function returns true, the stream is running.
200 static inline bool amdtp_stream_running(struct amdtp_stream *s)
202 return !IS_ERR(s->context);
206 * amdtp_streaming_error - check for streaming error
207 * @s: the AMDTP stream
209 * If this function returns true, the stream's packet queue has stopped due to
210 * an asynchronous error.
212 static inline bool amdtp_streaming_error(struct amdtp_stream *s)
214 return s->packet_index < 0;
218 * amdtp_stream_pcm_running - check PCM substream is running or not
219 * @s: the AMDTP stream
221 * If this function returns true, PCM substream in the AMDTP stream is running.
223 static inline bool amdtp_stream_pcm_running(struct amdtp_stream *s)
229 * amdtp_stream_pcm_trigger - start/stop playback from a PCM device
230 * @s: the AMDTP stream
231 * @pcm: the PCM device to be started, or %NULL to stop the current device
233 * Call this function on a running isochronous stream to enable the actual
234 * transmission of PCM data. This function should be called from the PCM
235 * device's .trigger callback.
237 static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s,
238 struct snd_pcm_substream *pcm)
240 ACCESS_ONCE(s->pcm) = pcm;
244 * amdtp_stream_midi_trigger - start/stop playback/capture with a MIDI device
245 * @s: the AMDTP stream
246 * @port: index of MIDI port
247 * @midi: the MIDI device to be started, or %NULL to stop the current device
249 * Call this function on a running isochronous stream to enable the actual
250 * transmission of MIDI data. This function should be called from the MIDI
251 * device's .trigger callback.
253 static inline void amdtp_stream_midi_trigger(struct amdtp_stream *s,
255 struct snd_rawmidi_substream *midi)
257 if (port < s->midi_ports)
258 ACCESS_ONCE(s->midi[port]) = midi;
261 static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
266 static inline void amdtp_stream_set_sync(enum cip_flags sync_mode,
267 struct amdtp_stream *master,
268 struct amdtp_stream *slave)
270 if (sync_mode == CIP_SYNC_TO_DEVICE) {
271 master->flags |= CIP_SYNC_TO_DEVICE;
272 slave->flags |= CIP_SYNC_TO_DEVICE;
273 master->sync_slave = slave;
275 master->flags &= ~CIP_SYNC_TO_DEVICE;
276 slave->flags &= ~CIP_SYNC_TO_DEVICE;
277 master->sync_slave = NULL;
280 slave->sync_slave = NULL;
284 * amdtp_stream_wait_callback - sleep till callbacked or timeout
285 * @s: the AMDTP stream
286 * @timeout: msec till timeout
288 * If this function return false, the AMDTP stream should be stopped.
290 static inline bool amdtp_stream_wait_callback(struct amdtp_stream *s,
291 unsigned int timeout)
293 return wait_event_timeout(s->callback_wait,
294 s->callbacked == true,
295 msecs_to_jiffies(timeout)) > 0;