[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.
 * @SKIP_DBC_ZERO_CHECK: Only for in-stream.  Packets with zero in dbc is
 *	skipped for detecting discontinuity.
 */
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,
};

/**
 * enum cip_sfc - a stream's sample rate
 */
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;

	struct snd_rawmidi_substream *midi[AMDTP_MAX_CHANNELS_FOR_MIDI * 8];

	/* quirk: fixed interval of dbc between previos/current packets. */
	unsigned int tx_dbc_interval;

	/* quirk: the first count of data blocks in an rx packet for MIDI */
	unsigned int rx_blocks_for_midi;

	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.
b84b1a27 TS	26	* @SKIP_DBC_ZERO_CHECK: Only for in-stream. Packets with zero in dbc is
b84b1a27 TS	27	* skipped for detecting discontinuity.
31ef9134	28	*/
be4a2894	29	enum cip_flags {
7b3b0d85 TS	30	CIP_NONBLOCKING = 0x00,
7b3b0d85 TS	31	CIP_BLOCKING = 0x01,
10550bea	32	CIP_SYNC_TO_DEVICE = 0x02,
7ab56645	33	CIP_EMPTY_WITH_TAG0 = 0x04,
c8bdf49b	34	CIP_DBC_IS_END_EVENT = 0x08,
69702239	35	CIP_WRONG_DBS = 0x10,
b84b1a27	36	CIP_SKIP_DBC_ZERO_CHECK = 0x20,
31ef9134 CL	37	};
	38
	39	/**
	40	* enum cip_sfc - a stream's sample rate
	41	*/
	42	enum cip_sfc {
	43	CIP_SFC_32000 = 0,
	44	CIP_SFC_44100 = 1,
	45	CIP_SFC_48000 = 2,
	46	CIP_SFC_88200 = 3,
	47	CIP_SFC_96000 = 4,
	48	CIP_SFC_176400 = 5,
	49	CIP_SFC_192000 = 6,
a7304e3b	50	CIP_SFC_COUNT
31ef9134 CL	51	};
31ef9134 CL	52
2b3fc456 TS	53	#define AMDTP_IN_PCM_FORMAT_BITS SNDRV_PCM_FMTBIT_S32
2b3fc456 TS	54
31ef9134 CL	55	#define AMDTP_OUT_PCM_FORMAT_BITS (SNDRV_PCM_FMTBIT_S16 \| \
	56	SNDRV_PCM_FMTBIT_S32)
	57
83d8d72d	58
77d2a8a4 TS	59	/*
	60	* This module supports maximum 64 PCM channels for one PCM stream
	61	* This is for our convenience.
	62	*/
	63	#define AMDTP_MAX_CHANNELS_FOR_PCM 64
	64
83d8d72d TS	65	/*
	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.
	69	*
	70	* This module supports maximum 1 MIDI conformant data channels.
	71	* Then this AMDTP packets can transfer maximum 8 MIDI data streams.
	72	*/
	73	#define AMDTP_MAX_CHANNELS_FOR_MIDI 1
	74
31ef9134 CL	75	struct fw_unit;
	76	struct fw_iso_context;
	77	struct snd_pcm_substream;
7b2d99fa	78	struct snd_pcm_runtime;
83d8d72d	79	struct snd_rawmidi_substream;
31ef9134	80
3ff7e8f0 TS	81	enum amdtp_stream_direction {
	82	AMDTP_OUT_STREAM = 0,
	83	AMDTP_IN_STREAM
	84	};
	85
be4a2894	86	struct amdtp_stream {
31ef9134	87	struct fw_unit *unit;
be4a2894	88	enum cip_flags flags;
3ff7e8f0	89	enum amdtp_stream_direction direction;
31ef9134 CL	90	struct fw_iso_context *context;
	91	struct mutex mutex;
	92
	93	enum cip_sfc sfc;
	94	unsigned int data_block_quadlets;
	95	unsigned int pcm_channels;
	96	unsigned int midi_ports;
be4a2894	97	void (transfer_samples)(struct amdtp_stream s,
31ef9134 CL	98	struct snd_pcm_substream *pcm,
31ef9134 CL	99	__be32 *buffer, unsigned int frames);
77d2a8a4 TS	100	u8 pcm_positions[AMDTP_MAX_CHANNELS_FOR_PCM];
77d2a8a4 TS	101	u8 midi_position;
31ef9134 CL	102
31ef9134 CL	103	unsigned int syt_interval;
e84d15f6	104	unsigned int transfer_delay;
31ef9134 CL	105	unsigned int source_node_id_field;
	106	struct iso_packets_buffer buffer;
	107
	108	struct snd_pcm_substream *pcm;
76fb8789	109	struct tasklet_struct period_tasklet;
31ef9134	110
ec00f5e4	111	int packet_index;
31ef9134 CL	112	unsigned int data_block_counter;
	113
	114	unsigned int data_block_state;
	115
	116	unsigned int last_syt_offset;
	117	unsigned int syt_offset_state;
	118
	119	unsigned int pcm_buffer_pointer;
	120	unsigned int pcm_period_pointer;
92b862c7	121	bool pointer_flush;
83d8d72d TS	122
83d8d72d TS	123	struct snd_rawmidi_substream midi[AMDTP_MAX_CHANNELS_FOR_MIDI 8];
7b3b0d85	124
d9cd0065 TS	125	/* quirk: fixed interval of dbc between previos/current packets. */
	126	unsigned int tx_dbc_interval;
	127
53111cdc TS	128	/* quirk: the first count of data blocks in an rx packet for MIDI */
	129	unsigned int rx_blocks_for_midi;
	130
7b3b0d85 TS	131	bool callbacked;
	132	wait_queue_head_t callback_wait;
	133	struct amdtp_stream *sync_slave;
31ef9134 CL	134	};
31ef9134 CL	135
be4a2894	136	int amdtp_stream_init(struct amdtp_stream s, struct fw_unit unit,
3ff7e8f0	137	enum amdtp_stream_direction dir,
be4a2894 TS	138	enum cip_flags flags);
be4a2894 TS	139	void amdtp_stream_destroy(struct amdtp_stream *s);
31ef9134	140
be4a2894 TS	141	void amdtp_stream_set_parameters(struct amdtp_stream *s,
	142	unsigned int rate,
	143	unsigned int pcm_channels,
	144	unsigned int midi_ports);
	145	unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s);
31ef9134	146
be4a2894 TS	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);
31ef9134	150
7b2d99fa TS	151	int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s,
7b2d99fa TS	152	struct snd_pcm_runtime *runtime);
be4a2894 TS	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);
31ef9134	158
c5280e99	159	extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT];
1017abed	160	extern const unsigned int amdtp_rate_table[CIP_SFC_COUNT];
a7304e3b	161
be4a2894 TS	162	/**
	163	* amdtp_stream_running - check stream is running or not
	164	* @s: the AMDTP stream
	165	*
	166	* If this function returns true, the stream is running.
	167	*/
	168	static inline bool amdtp_stream_running(struct amdtp_stream *s)
20b65dd0 CL	169	{
	170	return !IS_ERR(s->context);
	171	}
	172
ec00f5e4	173	/**
be4a2894 TS	174	* amdtp_streaming_error - check for streaming error
be4a2894 TS	175	* @s: the AMDTP stream
ec00f5e4 CL	176	*
	177	* If this function returns true, the stream's packet queue has stopped due to
	178	* an asynchronous error.
	179	*/
be4a2894	180	static inline bool amdtp_streaming_error(struct amdtp_stream *s)
ec00f5e4 CL	181	{
	182	return s->packet_index < 0;
	183	}
	184
83d8d72d TS	185	/**
	186	* amdtp_stream_pcm_running - check PCM substream is running or not
	187	* @s: the AMDTP stream
	188	*
	189	* If this function returns true, PCM substream in the AMDTP stream is running.
	190	*/
	191	static inline bool amdtp_stream_pcm_running(struct amdtp_stream *s)
	192	{
	193	return !!s->pcm;
	194	}
	195
31ef9134	196	/**
be4a2894 TS	197	* amdtp_stream_pcm_trigger - start/stop playback from a PCM device
be4a2894 TS	198	* @s: the AMDTP stream
31ef9134 CL	199	* @pcm: the PCM device to be started, or %NULL to stop the current device
	200	*
	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.
	204	*/
be4a2894 TS	205	static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s,
be4a2894 TS	206	struct snd_pcm_substream *pcm)
31ef9134 CL	207	{
	208	ACCESS_ONCE(s->pcm) = pcm;
	209	}
	210
83d8d72d TS	211	/**
	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
	216	*
	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.
	220	*/
	221	static inline void amdtp_stream_midi_trigger(struct amdtp_stream *s,
	222	unsigned int port,
	223	struct snd_rawmidi_substream *midi)
	224	{
	225	if (port < s->midi_ports)
	226	ACCESS_ONCE(s->midi[port]) = midi;
	227	}
	228
31ef9134 CL	229	static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
	230	{
	231	return sfc & 1;
	232	}
	233
7b3b0d85 TS	234	static inline void amdtp_stream_set_sync(enum cip_flags sync_mode,
	235	struct amdtp_stream *master,
	236	struct amdtp_stream *slave)
	237	{
	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;
	242	} else {
	243	master->flags &= ~CIP_SYNC_TO_DEVICE;
	244	slave->flags &= ~CIP_SYNC_TO_DEVICE;
	245	master->sync_slave = NULL;
	246	}
	247
	248	slave->sync_slave = NULL;
	249	}
	250
	251	/**
	252	* amdtp_stream_wait_callback - sleep till callbacked or timeout
	253	* @s: the AMDTP stream
	254	* @timeout: msec till timeout
	255	*
	256	* If this function return false, the AMDTP stream should be stopped.
	257	*/
	258	static inline bool amdtp_stream_wait_callback(struct amdtp_stream *s,
	259	unsigned int timeout)
	260	{
	261	return wait_event_timeout(s->callback_wait,
	262	s->callbacked == true,
	263	msecs_to_jiffies(timeout)) > 0;
	264	}
	265
31ef9134	266	#endif