[linux-2.6-block.git] / sound / firewire / amdtp.h

#ifndef SOUND_FIREWIRE_AMDTP_H_INCLUDED
#define SOUND_FIREWIRE_AMDTP_H_INCLUDED

#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/mutex.h>
#include <sound/asound.h>
#include "packets-buffer.h"

/**
 * enum cip_flags - describes details of the streaming protocol
 * @CIP_NONBLOCKING: In non-blocking mode, each packet contains
 *	sample_rate/8000 samples, with rounding up or down to adjust
 *	for clock skew and left-over fractional samples.  This should
 *	be used if supported by the device.
 * @CIP_BLOCKING: In blocking mode, each packet contains either zero or
 *	SYT_INTERVAL samples, with these two types alternating so that
 *	the overall sample rate comes out right.
 * @CIP_SYNC_TO_DEVICE: In sync to device mode, time stamp in out packets is
 *	generated by in packets. Defaultly this driver generates timestamp.
 * @CIP_EMPTY_WITH_TAG0: Only for in-stream. Empty in-packets have TAG0.
 * @CIP_DBC_IS_END_EVENT: Only for in-stream. The value of dbc in an in-packet
 *	corresponds to the end of event in the packet. Out of IEC 61883.
 * @CIP_WRONG_DBS: Only for in-stream. The value of dbs is wrong in in-packets.
 *	The value of data_block_quadlets is used instead of reported value.
 * @CIP_SKIP_DBC_ZERO_CHECK: Only for in-stream.  Packets with zero in dbc is
 *	skipped for detecting discontinuity.
 * @CIP_SKIP_INIT_DBC_CHECK: Only for in-stream. The value of dbc in first
 *	packet is not continuous from an initial value.
 * @CIP_EMPTY_HAS_WRONG_DBC: Only for in-stream. The value of dbc in empty
 *	packet is wrong but the others are correct.
 * @CIP_JUMBO_PAYLOAD: Only for in-stream. The number of data blocks in an
 *	packet is larger than IEC 61883-6 defines. Current implementation
 *	allows 5 times as large as IEC 61883-6 defines.
 */
enum cip_flags {
	CIP_NONBLOCKING		= 0x00,
	CIP_BLOCKING		= 0x01,
	CIP_SYNC_TO_DEVICE	= 0x02,
	CIP_EMPTY_WITH_TAG0	= 0x04,
	CIP_DBC_IS_END_EVENT	= 0x08,
	CIP_WRONG_DBS		= 0x10,
	CIP_SKIP_DBC_ZERO_CHECK	= 0x20,
	CIP_SKIP_INIT_DBC_CHECK	= 0x40,
	CIP_EMPTY_HAS_WRONG_DBC	= 0x80,
	CIP_JUMBO_PAYLOAD	= 0x100,
};

/**
 * enum cip_sfc - supported Sampling Frequency Codes (SFCs)
 * @CIP_SFC_32000:   32,000 data blocks
 * @CIP_SFC_44100:   44,100 data blocks
 * @CIP_SFC_48000:   48,000 data blocks
 * @CIP_SFC_88200:   88,200 data blocks
 * @CIP_SFC_96000:   96,000 data blocks
 * @CIP_SFC_176400: 176,400 data blocks
 * @CIP_SFC_192000: 192,000 data blocks
 * @CIP_SFC_COUNT: the number of supported SFCs
 *
 * These values are used to show nominal Sampling Frequency Code in
 * Format Dependent Field (FDF) of AMDTP packet header. In IEC 61883-6:2002,
 * this code means the number of events per second. Actually the code
 * represents the number of data blocks transferred per second in an AMDTP
 * stream.
 *
 * In IEC 61883-6:2005, some extensions were added to support more types of
 * data such as 'One Bit LInear Audio', therefore the meaning of SFC became
 * different depending on the types.
 *
 * Currently our implementation is compatible with IEC 61883-6:2002.
 */
enum cip_sfc {
	CIP_SFC_32000  = 0,
	CIP_SFC_44100  = 1,
	CIP_SFC_48000  = 2,
	CIP_SFC_88200  = 3,
	CIP_SFC_96000  = 4,
	CIP_SFC_176400 = 5,
	CIP_SFC_192000 = 6,
	CIP_SFC_COUNT
};

#define AMDTP_IN_PCM_FORMAT_BITS	SNDRV_PCM_FMTBIT_S32

#define AMDTP_OUT_PCM_FORMAT_BITS	(SNDRV_PCM_FMTBIT_S16 | \
					 SNDRV_PCM_FMTBIT_S32)


/*
 * This module supports maximum 64 PCM channels for one PCM stream
 * This is for our convenience.
 */
#define AMDTP_MAX_CHANNELS_FOR_PCM	64

/*
 * AMDTP packet can include channels for MIDI conformant data.
 * Each MIDI conformant data channel includes 8 MPX-MIDI data stream.
 * Each MPX-MIDI data stream includes one data stream from/to MIDI ports.
 *
 * This module supports maximum 1 MIDI conformant data channels.
 * Then this AMDTP packets can transfer maximum 8 MIDI data streams.
 */
#define AMDTP_MAX_CHANNELS_FOR_MIDI	1

struct fw_unit;
struct fw_iso_context;
struct snd_pcm_substream;
struct snd_pcm_runtime;
struct snd_rawmidi_substream;

enum amdtp_stream_direction {
	AMDTP_OUT_STREAM = 0,
	AMDTP_IN_STREAM
};

struct amdtp_stream {
	struct fw_unit *unit;
	enum cip_flags flags;
	enum amdtp_stream_direction direction;
	struct fw_iso_context *context;
	struct mutex mutex;

	enum cip_sfc sfc;
	unsigned int data_block_quadlets;
	unsigned int pcm_channels;
	unsigned int midi_ports;
	void (*transfer_samples)(struct amdtp_stream *s,
				 struct snd_pcm_substream *pcm,
				 __be32 *buffer, unsigned int frames);
	u8 pcm_positions[AMDTP_MAX_CHANNELS_FOR_PCM];
	u8 midi_position;

	unsigned int syt_interval;
	unsigned int transfer_delay;
	unsigned int source_node_id_field;
	struct iso_packets_buffer buffer;

	struct snd_pcm_substream *pcm;
	struct tasklet_struct period_tasklet;

	int packet_index;
	unsigned int data_block_counter;

	unsigned int data_block_state;

	unsigned int last_syt_offset;
	unsigned int syt_offset_state;

	unsigned int pcm_buffer_pointer;
	unsigned int pcm_period_pointer;
	bool pointer_flush;
	bool double_pcm_frames;

	struct snd_rawmidi_substream *midi[AMDTP_MAX_CHANNELS_FOR_MIDI * 8];
	int midi_fifo_limit;
	int midi_fifo_used[AMDTP_MAX_CHANNELS_FOR_MIDI * 8];

	/* quirk: fixed interval of dbc between previos/current packets. */
	unsigned int tx_dbc_interval;
	/* quirk: indicate the value of dbc field in a first packet. */
	unsigned int tx_first_dbc;

	bool callbacked;
	wait_queue_head_t callback_wait;
	struct amdtp_stream *sync_slave;
};

int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
		      enum amdtp_stream_direction dir,
		      enum cip_flags flags);
void amdtp_stream_destroy(struct amdtp_stream *s);

void amdtp_stream_set_parameters(struct amdtp_stream *s,
				 unsigned int rate,
				 unsigned int pcm_channels,
				 unsigned int midi_ports);
unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s);

int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed);
void amdtp_stream_update(struct amdtp_stream *s);
void amdtp_stream_stop(struct amdtp_stream *s);

int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s,
					struct snd_pcm_runtime *runtime);
void amdtp_stream_set_pcm_format(struct amdtp_stream *s,
				 snd_pcm_format_t format);
void amdtp_stream_pcm_prepare(struct amdtp_stream *s);
unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s);
void amdtp_stream_pcm_abort(struct amdtp_stream *s);

extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT];
extern const unsigned int amdtp_rate_table[CIP_SFC_COUNT];

/**
 * amdtp_stream_running - check stream is running or not
 * @s: the AMDTP stream
 *
 * If this function returns true, the stream is running.
 */
static inline bool amdtp_stream_running(struct amdtp_stream *s)
{
	return !IS_ERR(s->context);
}

/**
 * amdtp_streaming_error - check for streaming error
 * @s: the AMDTP stream
 *
 * If this function returns true, the stream's packet queue has stopped due to
 * an asynchronous error.
 */
static inline bool amdtp_streaming_error(struct amdtp_stream *s)
{
	return s->packet_index < 0;
}

/**
 * amdtp_stream_pcm_running - check PCM substream is running or not
 * @s: the AMDTP stream
 *
 * If this function returns true, PCM substream in the AMDTP stream is running.
 */
static inline bool amdtp_stream_pcm_running(struct amdtp_stream *s)
{
	return !!s->pcm;
}

/**
 * amdtp_stream_pcm_trigger - start/stop playback from a PCM device
 * @s: the AMDTP stream
 * @pcm: the PCM device to be started, or %NULL to stop the current device
 *
 * Call this function on a running isochronous stream to enable the actual
 * transmission of PCM data.  This function should be called from the PCM
 * device's .trigger callback.
 */
static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s,
					    struct snd_pcm_substream *pcm)
{
	ACCESS_ONCE(s->pcm) = pcm;
}

/**
 * amdtp_stream_midi_trigger - start/stop playback/capture with a MIDI device
 * @s: the AMDTP stream
 * @port: index of MIDI port
 * @midi: the MIDI device to be started, or %NULL to stop the current device
 *
 * Call this function on a running isochronous stream to enable the actual
 * transmission of MIDI data.  This function should be called from the MIDI
 * device's .trigger callback.
 */
static inline void amdtp_stream_midi_trigger(struct amdtp_stream *s,
					     unsigned int port,
					     struct snd_rawmidi_substream *midi)
{
	if (port < s->midi_ports)
		ACCESS_ONCE(s->midi[port]) = midi;
}

static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
{
	return sfc & 1;
}

static inline void amdtp_stream_set_sync(enum cip_flags sync_mode,
					 struct amdtp_stream *master,
					 struct amdtp_stream *slave)
{
	if (sync_mode == CIP_SYNC_TO_DEVICE) {
		master->flags |= CIP_SYNC_TO_DEVICE;
		slave->flags |= CIP_SYNC_TO_DEVICE;
		master->sync_slave = slave;
	} else {
		master->flags &= ~CIP_SYNC_TO_DEVICE;
		slave->flags &= ~CIP_SYNC_TO_DEVICE;
		master->sync_slave = NULL;
	}

	slave->sync_slave = NULL;
}

/**
 * amdtp_stream_wait_callback - sleep till callbacked or timeout
 * @s: the AMDTP stream
 * @timeout: msec till timeout
 *
 * If this function return false, the AMDTP stream should be stopped.
 */
static inline bool amdtp_stream_wait_callback(struct amdtp_stream *s,
					      unsigned int timeout)
{
	return wait_event_timeout(s->callback_wait,
				  s->callbacked == true,
				  msecs_to_jiffies(timeout)) > 0;
}

#endif
Commit	Line	Data
31ef9134 CL	1	#ifndef SOUND_FIREWIRE_AMDTP_H_INCLUDED
	2	#define SOUND_FIREWIRE_AMDTP_H_INCLUDED
	3
20b65dd0	4	#include <linux/err.h>
76fb8789	5	#include <linux/interrupt.h>
31ef9134	6	#include <linux/mutex.h>
777fb574	7	#include <sound/asound.h>
31ef9134 CL	8	#include "packets-buffer.h"
	9
	10	/**
be4a2894	11	* enum cip_flags - describes details of the streaming protocol
31ef9134 CL	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.
e84d15f6 CL	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.
7b3b0d85 TS	19	* @CIP_SYNC_TO_DEVICE: In sync to device mode, time stamp in out packets is
7b3b0d85 TS	20	* generated by in packets. Defaultly this driver generates timestamp.
7ab56645	21	* @CIP_EMPTY_WITH_TAG0: Only for in-stream. Empty in-packets have TAG0.
c8bdf49b TS	22	* @CIP_DBC_IS_END_EVENT: Only for in-stream. The value of dbc in an in-packet
c8bdf49b TS	23	* corresponds to the end of event in the packet. Out of IEC 61883.
69702239 TS	24	* @CIP_WRONG_DBS: Only for in-stream. The value of dbs is wrong in in-packets.
69702239 TS	25	* The value of data_block_quadlets is used instead of reported value.
5f217f90	26	* @CIP_SKIP_DBC_ZERO_CHECK: Only for in-stream. Packets with zero in dbc is
b84b1a27	27	* skipped for detecting discontinuity.
b6bc8123 TS	28	* @CIP_SKIP_INIT_DBC_CHECK: Only for in-stream. The value of dbc in first
b6bc8123 TS	29	* packet is not continuous from an initial value.
9d59124c TS	30	* @CIP_EMPTY_HAS_WRONG_DBC: Only for in-stream. The value of dbc in empty
9d59124c TS	31	* packet is wrong but the others are correct.
a2064710 TS	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.
31ef9134	35	*/
be4a2894	36	enum cip_flags {
7b3b0d85 TS	37	CIP_NONBLOCKING = 0x00,
7b3b0d85 TS	38	CIP_BLOCKING = 0x01,
10550bea	39	CIP_SYNC_TO_DEVICE = 0x02,
7ab56645	40	CIP_EMPTY_WITH_TAG0 = 0x04,
c8bdf49b	41	CIP_DBC_IS_END_EVENT = 0x08,
69702239	42	CIP_WRONG_DBS = 0x10,
b84b1a27	43	CIP_SKIP_DBC_ZERO_CHECK = 0x20,
b6bc8123	44	CIP_SKIP_INIT_DBC_CHECK = 0x40,
9d59124c	45	CIP_EMPTY_HAS_WRONG_DBC = 0x80,
a2064710	46	CIP_JUMBO_PAYLOAD = 0x100,
31ef9134 CL	47	};
	48
	49	/**
5f217f90 TS	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
	59	*
	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
	64	* stream.
	65	*
	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.
	69	*
	70	* Currently our implementation is compatible with IEC 61883-6:2002.
31ef9134 CL	71	*/
	72	enum cip_sfc {
	73	CIP_SFC_32000 = 0,
	74	CIP_SFC_44100 = 1,
	75	CIP_SFC_48000 = 2,
	76	CIP_SFC_88200 = 3,
	77	CIP_SFC_96000 = 4,
	78	CIP_SFC_176400 = 5,
	79	CIP_SFC_192000 = 6,
a7304e3b	80	CIP_SFC_COUNT
31ef9134 CL	81	};
31ef9134 CL	82
2b3fc456 TS	83	#define AMDTP_IN_PCM_FORMAT_BITS SNDRV_PCM_FMTBIT_S32
2b3fc456 TS	84
31ef9134 CL	85	#define AMDTP_OUT_PCM_FORMAT_BITS (SNDRV_PCM_FMTBIT_S16 \| \
	86	SNDRV_PCM_FMTBIT_S32)
	87
83d8d72d	88
77d2a8a4 TS	89	/*
	90	* This module supports maximum 64 PCM channels for one PCM stream
	91	* This is for our convenience.
	92	*/
	93	#define AMDTP_MAX_CHANNELS_FOR_PCM 64
	94
83d8d72d TS	95	/*
	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.
	99	*
	100	* This module supports maximum 1 MIDI conformant data channels.
	101	* Then this AMDTP packets can transfer maximum 8 MIDI data streams.
	102	*/
	103	#define AMDTP_MAX_CHANNELS_FOR_MIDI 1
	104
31ef9134 CL	105	struct fw_unit;
	106	struct fw_iso_context;
	107	struct snd_pcm_substream;
7b2d99fa	108	struct snd_pcm_runtime;
83d8d72d	109	struct snd_rawmidi_substream;
31ef9134	110
3ff7e8f0 TS	111	enum amdtp_stream_direction {
	112	AMDTP_OUT_STREAM = 0,
	113	AMDTP_IN_STREAM
	114	};
	115
be4a2894	116	struct amdtp_stream {
31ef9134	117	struct fw_unit *unit;
be4a2894	118	enum cip_flags flags;
3ff7e8f0	119	enum amdtp_stream_direction direction;
31ef9134 CL	120	struct fw_iso_context *context;
	121	struct mutex mutex;
	122
	123	enum cip_sfc sfc;
	124	unsigned int data_block_quadlets;
	125	unsigned int pcm_channels;
	126	unsigned int midi_ports;
be4a2894	127	void (transfer_samples)(struct amdtp_stream s,
31ef9134 CL	128	struct snd_pcm_substream *pcm,
31ef9134 CL	129	__be32 *buffer, unsigned int frames);
77d2a8a4 TS	130	u8 pcm_positions[AMDTP_MAX_CHANNELS_FOR_PCM];
77d2a8a4 TS	131	u8 midi_position;
31ef9134 CL	132
31ef9134 CL	133	unsigned int syt_interval;
e84d15f6	134	unsigned int transfer_delay;
31ef9134 CL	135	unsigned int source_node_id_field;
	136	struct iso_packets_buffer buffer;
	137
	138	struct snd_pcm_substream *pcm;
76fb8789	139	struct tasklet_struct period_tasklet;
31ef9134	140
ec00f5e4	141	int packet_index;
31ef9134 CL	142	unsigned int data_block_counter;
	143
	144	unsigned int data_block_state;
	145
	146	unsigned int last_syt_offset;
	147	unsigned int syt_offset_state;
	148
	149	unsigned int pcm_buffer_pointer;
	150	unsigned int pcm_period_pointer;
92b862c7	151	bool pointer_flush;
65845f29	152	bool double_pcm_frames;
83d8d72d TS	153
83d8d72d TS	154	struct snd_rawmidi_substream midi[AMDTP_MAX_CHANNELS_FOR_MIDI 8];
25ca917c CL	155	int midi_fifo_limit;
25ca917c CL	156	int midi_fifo_used[AMDTP_MAX_CHANNELS_FOR_MIDI * 8];
7b3b0d85	157
d9cd0065 TS	158	/* quirk: fixed interval of dbc between previos/current packets. */
d9cd0065 TS	159	unsigned int tx_dbc_interval;
18f5ed36 TS	160	/* quirk: indicate the value of dbc field in a first packet. */
18f5ed36 TS	161	unsigned int tx_first_dbc;
d9cd0065	162
7b3b0d85 TS	163	bool callbacked;
	164	wait_queue_head_t callback_wait;
	165	struct amdtp_stream *sync_slave;
31ef9134 CL	166	};
31ef9134 CL	167
be4a2894	168	int amdtp_stream_init(struct amdtp_stream s, struct fw_unit unit,
3ff7e8f0	169	enum amdtp_stream_direction dir,
be4a2894 TS	170	enum cip_flags flags);
be4a2894 TS	171	void amdtp_stream_destroy(struct amdtp_stream *s);
31ef9134	172
be4a2894 TS	173	void amdtp_stream_set_parameters(struct amdtp_stream *s,
	174	unsigned int rate,
	175	unsigned int pcm_channels,
	176	unsigned int midi_ports);
	177	unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s);
31ef9134	178
be4a2894 TS	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);
31ef9134	182
7b2d99fa TS	183	int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s,
7b2d99fa TS	184	struct snd_pcm_runtime *runtime);
be4a2894 TS	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);
31ef9134	190
c5280e99	191	extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT];
1017abed	192	extern const unsigned int amdtp_rate_table[CIP_SFC_COUNT];
a7304e3b	193
be4a2894 TS	194	/**
	195	* amdtp_stream_running - check stream is running or not
	196	* @s: the AMDTP stream
	197	*
	198	* If this function returns true, the stream is running.
	199	*/
	200	static inline bool amdtp_stream_running(struct amdtp_stream *s)
20b65dd0 CL	201	{
	202	return !IS_ERR(s->context);
	203	}
	204
ec00f5e4	205	/**
be4a2894 TS	206	* amdtp_streaming_error - check for streaming error
be4a2894 TS	207	* @s: the AMDTP stream
ec00f5e4 CL	208	*
	209	* If this function returns true, the stream's packet queue has stopped due to
	210	* an asynchronous error.
	211	*/
be4a2894	212	static inline bool amdtp_streaming_error(struct amdtp_stream *s)
ec00f5e4 CL	213	{
	214	return s->packet_index < 0;
	215	}
	216
83d8d72d TS	217	/**
	218	* amdtp_stream_pcm_running - check PCM substream is running or not
	219	* @s: the AMDTP stream
	220	*
	221	* If this function returns true, PCM substream in the AMDTP stream is running.
	222	*/
	223	static inline bool amdtp_stream_pcm_running(struct amdtp_stream *s)
	224	{
	225	return !!s->pcm;
	226	}
	227
31ef9134	228	/**
be4a2894 TS	229	* amdtp_stream_pcm_trigger - start/stop playback from a PCM device
be4a2894 TS	230	* @s: the AMDTP stream
31ef9134 CL	231	* @pcm: the PCM device to be started, or %NULL to stop the current device
	232	*
	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.
	236	*/
be4a2894 TS	237	static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s,
be4a2894 TS	238	struct snd_pcm_substream *pcm)
31ef9134 CL	239	{
	240	ACCESS_ONCE(s->pcm) = pcm;
	241	}
	242
83d8d72d TS	243	/**
	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
	248	*
	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.
	252	*/
	253	static inline void amdtp_stream_midi_trigger(struct amdtp_stream *s,
	254	unsigned int port,
	255	struct snd_rawmidi_substream *midi)
	256	{
	257	if (port < s->midi_ports)
	258	ACCESS_ONCE(s->midi[port]) = midi;
	259	}
	260
31ef9134 CL	261	static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
	262	{
	263	return sfc & 1;
	264	}
	265
7b3b0d85 TS	266	static inline void amdtp_stream_set_sync(enum cip_flags sync_mode,
	267	struct amdtp_stream *master,
	268	struct amdtp_stream *slave)
	269	{
	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;
	274	} else {
	275	master->flags &= ~CIP_SYNC_TO_DEVICE;
	276	slave->flags &= ~CIP_SYNC_TO_DEVICE;
	277	master->sync_slave = NULL;
	278	}
	279
	280	slave->sync_slave = NULL;
	281	}
	282
	283	/**
	284	* amdtp_stream_wait_callback - sleep till callbacked or timeout
	285	* @s: the AMDTP stream
	286	* @timeout: msec till timeout
	287	*
	288	* If this function return false, the AMDTP stream should be stopped.
	289	*/
	290	static inline bool amdtp_stream_wait_callback(struct amdtp_stream *s,
	291	unsigned int timeout)
	292	{
	293	return wait_event_timeout(s->callback_wait,
	294	s->callbacked == true,
	295	msecs_to_jiffies(timeout)) > 0;
	296	}
	297
31ef9134	298	#endif