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.
23 CIP_NONBLOCKING = 0x00,
25 CIP_SYNC_TO_DEVICE = 0x02,
29 * enum cip_sfc - a stream's sample rate
42 #define AMDTP_IN_PCM_FORMAT_BITS SNDRV_PCM_FMTBIT_S32
44 #define AMDTP_OUT_PCM_FORMAT_BITS (SNDRV_PCM_FMTBIT_S16 | \
49 * This module supports maximum 64 PCM channels for one PCM stream
50 * This is for our convenience.
52 #define AMDTP_MAX_CHANNELS_FOR_PCM 64
55 * AMDTP packet can include channels for MIDI conformant data.
56 * Each MIDI conformant data channel includes 8 MPX-MIDI data stream.
57 * Each MPX-MIDI data stream includes one data stream from/to MIDI ports.
59 * This module supports maximum 1 MIDI conformant data channels.
60 * Then this AMDTP packets can transfer maximum 8 MIDI data streams.
62 #define AMDTP_MAX_CHANNELS_FOR_MIDI 1
65 struct fw_iso_context;
66 struct snd_pcm_substream;
67 struct snd_pcm_runtime;
68 struct snd_rawmidi_substream;
70 enum amdtp_stream_direction {
78 enum amdtp_stream_direction direction;
79 struct fw_iso_context *context;
83 unsigned int data_block_quadlets;
84 unsigned int pcm_channels;
85 unsigned int midi_ports;
86 void (*transfer_samples)(struct amdtp_stream *s,
87 struct snd_pcm_substream *pcm,
88 __be32 *buffer, unsigned int frames);
89 u8 pcm_positions[AMDTP_MAX_CHANNELS_FOR_PCM];
92 unsigned int syt_interval;
93 unsigned int transfer_delay;
94 unsigned int source_node_id_field;
95 struct iso_packets_buffer buffer;
97 struct snd_pcm_substream *pcm;
98 struct tasklet_struct period_tasklet;
101 unsigned int data_block_counter;
103 unsigned int data_block_state;
105 unsigned int last_syt_offset;
106 unsigned int syt_offset_state;
108 unsigned int pcm_buffer_pointer;
109 unsigned int pcm_period_pointer;
112 struct snd_rawmidi_substream *midi[AMDTP_MAX_CHANNELS_FOR_MIDI * 8];
115 wait_queue_head_t callback_wait;
116 struct amdtp_stream *sync_slave;
119 int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
120 enum amdtp_stream_direction dir,
121 enum cip_flags flags);
122 void amdtp_stream_destroy(struct amdtp_stream *s);
124 void amdtp_stream_set_parameters(struct amdtp_stream *s,
126 unsigned int pcm_channels,
127 unsigned int midi_ports);
128 unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s);
130 int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed);
131 void amdtp_stream_update(struct amdtp_stream *s);
132 void amdtp_stream_stop(struct amdtp_stream *s);
134 int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s,
135 struct snd_pcm_runtime *runtime);
136 void amdtp_stream_set_pcm_format(struct amdtp_stream *s,
137 snd_pcm_format_t format);
138 void amdtp_stream_pcm_prepare(struct amdtp_stream *s);
139 unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s);
140 void amdtp_stream_pcm_abort(struct amdtp_stream *s);
142 extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT];
145 * amdtp_stream_running - check stream is running or not
146 * @s: the AMDTP stream
148 * If this function returns true, the stream is running.
150 static inline bool amdtp_stream_running(struct amdtp_stream *s)
152 return !IS_ERR(s->context);
156 * amdtp_streaming_error - check for streaming error
157 * @s: the AMDTP stream
159 * If this function returns true, the stream's packet queue has stopped due to
160 * an asynchronous error.
162 static inline bool amdtp_streaming_error(struct amdtp_stream *s)
164 return s->packet_index < 0;
168 * amdtp_stream_pcm_running - check PCM substream is running or not
169 * @s: the AMDTP stream
171 * If this function returns true, PCM substream in the AMDTP stream is running.
173 static inline bool amdtp_stream_pcm_running(struct amdtp_stream *s)
179 * amdtp_stream_pcm_trigger - start/stop playback from a PCM device
180 * @s: the AMDTP stream
181 * @pcm: the PCM device to be started, or %NULL to stop the current device
183 * Call this function on a running isochronous stream to enable the actual
184 * transmission of PCM data. This function should be called from the PCM
185 * device's .trigger callback.
187 static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s,
188 struct snd_pcm_substream *pcm)
190 ACCESS_ONCE(s->pcm) = pcm;
194 * amdtp_stream_midi_trigger - start/stop playback/capture with a MIDI device
195 * @s: the AMDTP stream
196 * @port: index of MIDI port
197 * @midi: the MIDI device to be started, or %NULL to stop the current device
199 * Call this function on a running isochronous stream to enable the actual
200 * transmission of MIDI data. This function should be called from the MIDI
201 * device's .trigger callback.
203 static inline void amdtp_stream_midi_trigger(struct amdtp_stream *s,
205 struct snd_rawmidi_substream *midi)
207 if (port < s->midi_ports)
208 ACCESS_ONCE(s->midi[port]) = midi;
211 static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
216 static inline void amdtp_stream_set_sync(enum cip_flags sync_mode,
217 struct amdtp_stream *master,
218 struct amdtp_stream *slave)
220 if (sync_mode == CIP_SYNC_TO_DEVICE) {
221 master->flags |= CIP_SYNC_TO_DEVICE;
222 slave->flags |= CIP_SYNC_TO_DEVICE;
223 master->sync_slave = slave;
225 master->flags &= ~CIP_SYNC_TO_DEVICE;
226 slave->flags &= ~CIP_SYNC_TO_DEVICE;
227 master->sync_slave = NULL;
230 slave->sync_slave = NULL;
234 * amdtp_stream_wait_callback - sleep till callbacked or timeout
235 * @s: the AMDTP stream
236 * @timeout: msec till timeout
238 * If this function return false, the AMDTP stream should be stopped.
240 static inline bool amdtp_stream_wait_callback(struct amdtp_stream *s,
241 unsigned int timeout)
243 return wait_event_timeout(s->callback_wait,
244 s->callbacked == true,
245 msecs_to_jiffies(timeout)) > 0;