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 * @SKIP_DBC_ZERO_CHECK: Only for in-stream. Packets with zero in dbc is
27 * skipped for detecting discontinuity.
30 CIP_NONBLOCKING = 0x00,
32 CIP_SYNC_TO_DEVICE = 0x02,
33 CIP_EMPTY_WITH_TAG0 = 0x04,
34 CIP_DBC_IS_END_EVENT = 0x08,
36 CIP_SKIP_DBC_ZERO_CHECK = 0x20,
40 * enum cip_sfc - a stream's sample rate
53 #define AMDTP_IN_PCM_FORMAT_BITS SNDRV_PCM_FMTBIT_S32
55 #define AMDTP_OUT_PCM_FORMAT_BITS (SNDRV_PCM_FMTBIT_S16 | \
60 * This module supports maximum 64 PCM channels for one PCM stream
61 * This is for our convenience.
63 #define AMDTP_MAX_CHANNELS_FOR_PCM 64
66 * AMDTP packet can include channels for MIDI conformant data.
67 * Each MIDI conformant data channel includes 8 MPX-MIDI data stream.
68 * Each MPX-MIDI data stream includes one data stream from/to MIDI ports.
70 * This module supports maximum 1 MIDI conformant data channels.
71 * Then this AMDTP packets can transfer maximum 8 MIDI data streams.
73 #define AMDTP_MAX_CHANNELS_FOR_MIDI 1
76 struct fw_iso_context;
77 struct snd_pcm_substream;
78 struct snd_pcm_runtime;
79 struct snd_rawmidi_substream;
81 enum amdtp_stream_direction {
89 enum amdtp_stream_direction direction;
90 struct fw_iso_context *context;
94 unsigned int data_block_quadlets;
95 unsigned int pcm_channels;
96 unsigned int midi_ports;
97 void (*transfer_samples)(struct amdtp_stream *s,
98 struct snd_pcm_substream *pcm,
99 __be32 *buffer, unsigned int frames);
100 u8 pcm_positions[AMDTP_MAX_CHANNELS_FOR_PCM];
103 unsigned int syt_interval;
104 unsigned int transfer_delay;
105 unsigned int source_node_id_field;
106 struct iso_packets_buffer buffer;
108 struct snd_pcm_substream *pcm;
109 struct tasklet_struct period_tasklet;
112 unsigned int data_block_counter;
114 unsigned int data_block_state;
116 unsigned int last_syt_offset;
117 unsigned int syt_offset_state;
119 unsigned int pcm_buffer_pointer;
120 unsigned int pcm_period_pointer;
123 struct snd_rawmidi_substream *midi[AMDTP_MAX_CHANNELS_FOR_MIDI * 8];
125 /* quirk: fixed interval of dbc between previos/current packets. */
126 unsigned int tx_dbc_interval;
128 /* quirk: the first count of data blocks in an rx packet for MIDI */
129 unsigned int rx_blocks_for_midi;
132 wait_queue_head_t callback_wait;
133 struct amdtp_stream *sync_slave;
136 int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
137 enum amdtp_stream_direction dir,
138 enum cip_flags flags);
139 void amdtp_stream_destroy(struct amdtp_stream *s);
141 void amdtp_stream_set_parameters(struct amdtp_stream *s,
143 unsigned int pcm_channels,
144 unsigned int midi_ports);
145 unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s);
147 int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed);
148 void amdtp_stream_update(struct amdtp_stream *s);
149 void amdtp_stream_stop(struct amdtp_stream *s);
151 int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s,
152 struct snd_pcm_runtime *runtime);
153 void amdtp_stream_set_pcm_format(struct amdtp_stream *s,
154 snd_pcm_format_t format);
155 void amdtp_stream_pcm_prepare(struct amdtp_stream *s);
156 unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s);
157 void amdtp_stream_pcm_abort(struct amdtp_stream *s);
159 extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT];
160 extern const unsigned int amdtp_rate_table[CIP_SFC_COUNT];
163 * amdtp_stream_running - check stream is running or not
164 * @s: the AMDTP stream
166 * If this function returns true, the stream is running.
168 static inline bool amdtp_stream_running(struct amdtp_stream *s)
170 return !IS_ERR(s->context);
174 * amdtp_streaming_error - check for streaming error
175 * @s: the AMDTP stream
177 * If this function returns true, the stream's packet queue has stopped due to
178 * an asynchronous error.
180 static inline bool amdtp_streaming_error(struct amdtp_stream *s)
182 return s->packet_index < 0;
186 * amdtp_stream_pcm_running - check PCM substream is running or not
187 * @s: the AMDTP stream
189 * If this function returns true, PCM substream in the AMDTP stream is running.
191 static inline bool amdtp_stream_pcm_running(struct amdtp_stream *s)
197 * amdtp_stream_pcm_trigger - start/stop playback from a PCM device
198 * @s: the AMDTP stream
199 * @pcm: the PCM device to be started, or %NULL to stop the current device
201 * Call this function on a running isochronous stream to enable the actual
202 * transmission of PCM data. This function should be called from the PCM
203 * device's .trigger callback.
205 static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s,
206 struct snd_pcm_substream *pcm)
208 ACCESS_ONCE(s->pcm) = pcm;
212 * amdtp_stream_midi_trigger - start/stop playback/capture with a MIDI device
213 * @s: the AMDTP stream
214 * @port: index of MIDI port
215 * @midi: the MIDI device to be started, or %NULL to stop the current device
217 * Call this function on a running isochronous stream to enable the actual
218 * transmission of MIDI data. This function should be called from the MIDI
219 * device's .trigger callback.
221 static inline void amdtp_stream_midi_trigger(struct amdtp_stream *s,
223 struct snd_rawmidi_substream *midi)
225 if (port < s->midi_ports)
226 ACCESS_ONCE(s->midi[port]) = midi;
229 static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
234 static inline void amdtp_stream_set_sync(enum cip_flags sync_mode,
235 struct amdtp_stream *master,
236 struct amdtp_stream *slave)
238 if (sync_mode == CIP_SYNC_TO_DEVICE) {
239 master->flags |= CIP_SYNC_TO_DEVICE;
240 slave->flags |= CIP_SYNC_TO_DEVICE;
241 master->sync_slave = slave;
243 master->flags &= ~CIP_SYNC_TO_DEVICE;
244 slave->flags &= ~CIP_SYNC_TO_DEVICE;
245 master->sync_slave = NULL;
248 slave->sync_slave = NULL;
252 * amdtp_stream_wait_callback - sleep till callbacked or timeout
253 * @s: the AMDTP stream
254 * @timeout: msec till timeout
256 * If this function return false, the AMDTP stream should be stopped.
258 static inline bool amdtp_stream_wait_callback(struct amdtp_stream *s,
259 unsigned int timeout)
261 return wait_event_timeout(s->callback_wait,
262 s->callbacked == true,
263 msecs_to_jiffies(timeout)) > 0;