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_rawmidi_substream;
69 enum amdtp_stream_direction {
77 enum amdtp_stream_direction direction;
78 struct fw_iso_context *context;
82 unsigned int data_block_quadlets;
83 unsigned int pcm_channels;
84 unsigned int midi_ports;
85 void (*transfer_samples)(struct amdtp_stream *s,
86 struct snd_pcm_substream *pcm,
87 __be32 *buffer, unsigned int frames);
88 u8 pcm_positions[AMDTP_MAX_CHANNELS_FOR_PCM];
91 unsigned int syt_interval;
92 unsigned int transfer_delay;
93 unsigned int source_node_id_field;
94 struct iso_packets_buffer buffer;
96 struct snd_pcm_substream *pcm;
97 struct tasklet_struct period_tasklet;
100 unsigned int data_block_counter;
102 unsigned int data_block_state;
104 unsigned int last_syt_offset;
105 unsigned int syt_offset_state;
107 unsigned int pcm_buffer_pointer;
108 unsigned int pcm_period_pointer;
111 struct snd_rawmidi_substream *midi[AMDTP_MAX_CHANNELS_FOR_MIDI * 8];
114 wait_queue_head_t callback_wait;
115 struct amdtp_stream *sync_slave;
118 int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
119 enum amdtp_stream_direction dir,
120 enum cip_flags flags);
121 void amdtp_stream_destroy(struct amdtp_stream *s);
123 void amdtp_stream_set_parameters(struct amdtp_stream *s,
125 unsigned int pcm_channels,
126 unsigned int midi_ports);
127 unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s);
129 int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed);
130 void amdtp_stream_update(struct amdtp_stream *s);
131 void amdtp_stream_stop(struct amdtp_stream *s);
133 void amdtp_stream_set_pcm_format(struct amdtp_stream *s,
134 snd_pcm_format_t format);
135 void amdtp_stream_pcm_prepare(struct amdtp_stream *s);
136 unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s);
137 void amdtp_stream_pcm_abort(struct amdtp_stream *s);
139 extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT];
142 * amdtp_stream_running - check stream is running or not
143 * @s: the AMDTP stream
145 * If this function returns true, the stream is running.
147 static inline bool amdtp_stream_running(struct amdtp_stream *s)
149 return !IS_ERR(s->context);
153 * amdtp_streaming_error - check for streaming error
154 * @s: the AMDTP stream
156 * If this function returns true, the stream's packet queue has stopped due to
157 * an asynchronous error.
159 static inline bool amdtp_streaming_error(struct amdtp_stream *s)
161 return s->packet_index < 0;
165 * amdtp_stream_pcm_running - check PCM substream is running or not
166 * @s: the AMDTP stream
168 * If this function returns true, PCM substream in the AMDTP stream is running.
170 static inline bool amdtp_stream_pcm_running(struct amdtp_stream *s)
176 * amdtp_stream_pcm_trigger - start/stop playback from a PCM device
177 * @s: the AMDTP stream
178 * @pcm: the PCM device to be started, or %NULL to stop the current device
180 * Call this function on a running isochronous stream to enable the actual
181 * transmission of PCM data. This function should be called from the PCM
182 * device's .trigger callback.
184 static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s,
185 struct snd_pcm_substream *pcm)
187 ACCESS_ONCE(s->pcm) = pcm;
191 * amdtp_stream_midi_trigger - start/stop playback/capture with a MIDI device
192 * @s: the AMDTP stream
193 * @port: index of MIDI port
194 * @midi: the MIDI device to be started, or %NULL to stop the current device
196 * Call this function on a running isochronous stream to enable the actual
197 * transmission of MIDI data. This function should be called from the MIDI
198 * device's .trigger callback.
200 static inline void amdtp_stream_midi_trigger(struct amdtp_stream *s,
202 struct snd_rawmidi_substream *midi)
204 if (port < s->midi_ports)
205 ACCESS_ONCE(s->midi[port]) = midi;
208 static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
213 static inline void amdtp_stream_set_sync(enum cip_flags sync_mode,
214 struct amdtp_stream *master,
215 struct amdtp_stream *slave)
217 if (sync_mode == CIP_SYNC_TO_DEVICE) {
218 master->flags |= CIP_SYNC_TO_DEVICE;
219 slave->flags |= CIP_SYNC_TO_DEVICE;
220 master->sync_slave = slave;
222 master->flags &= ~CIP_SYNC_TO_DEVICE;
223 slave->flags &= ~CIP_SYNC_TO_DEVICE;
224 master->sync_slave = NULL;
227 slave->sync_slave = NULL;
231 * amdtp_stream_wait_callback - sleep till callbacked or timeout
232 * @s: the AMDTP stream
233 * @timeout: msec till timeout
235 * If this function return false, the AMDTP stream should be stopped.
237 static inline bool amdtp_stream_wait_callback(struct amdtp_stream *s,
238 unsigned int timeout)
240 return wait_event_timeout(s->callback_wait,
241 s->callbacked == true,
242 msecs_to_jiffies(timeout)) > 0;