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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Universal MIDI Packet (UMP) Support
*/
#ifndef __SOUND_UMP_H
#define __SOUND_UMP_H
#include <sound/rawmidi.h>
struct snd_ump_endpoint;
struct snd_ump_block;
struct snd_ump_ops;
struct ump_cvt_to_ump;
struct snd_ump_endpoint {
struct snd_rawmidi core; /* raw UMP access */
struct snd_ump_endpoint_info info;
const struct snd_ump_ops *ops; /* UMP ops set by the driver */
struct snd_rawmidi_substream *substreams[2]; /* opened substreams */
void *private_data;
void (*private_free)(struct snd_ump_endpoint *ump);
struct list_head block_list; /* list of snd_ump_block objects */
/* intermediate buffer for UMP input */
u32 input_buf[4];
int input_buf_head;
int input_pending;
#if IS_ENABLED(CONFIG_SND_UMP_LEGACY_RAWMIDI)
struct mutex open_mutex;
spinlock_t legacy_locks[2];
struct snd_rawmidi *legacy_rmidi;
struct snd_rawmidi_substream *legacy_substreams[2][SNDRV_UMP_MAX_GROUPS];
/* for legacy output; need to open the actual substream unlike input */
int legacy_out_opens;
struct snd_rawmidi_file legacy_out_rfile;
struct ump_cvt_to_ump *out_cvts;
#endif
};
/* ops filled by UMP drivers */
struct snd_ump_ops {
int (*open)(struct snd_ump_endpoint *ump, int dir);
void (*close)(struct snd_ump_endpoint *ump, int dir);
void (*trigger)(struct snd_ump_endpoint *ump, int dir, int up);
void (*drain)(struct snd_ump_endpoint *ump, int dir);
};
struct snd_ump_block {
struct snd_ump_block_info info;
struct snd_ump_endpoint *ump;
void *private_data;
void (*private_free)(struct snd_ump_block *blk);
struct list_head list;
};
#define rawmidi_to_ump(rmidi) container_of(rmidi, struct snd_ump_endpoint, core)
int snd_ump_endpoint_new(struct snd_card *card, char *id, int device,
int output, int input,
struct snd_ump_endpoint **ump_ret);
int snd_ump_block_new(struct snd_ump_endpoint *ump, unsigned int blk,
unsigned int direction, unsigned int first_group,
unsigned int num_groups, struct snd_ump_block **blk_ret);
int snd_ump_receive(struct snd_ump_endpoint *ump, const u32 *buffer, int count);
int snd_ump_transmit(struct snd_ump_endpoint *ump, u32 *buffer, int count);
#if IS_ENABLED(CONFIG_SND_UMP_LEGACY_RAWMIDI)
int snd_ump_attach_legacy_rawmidi(struct snd_ump_endpoint *ump,
char *id, int device);
#else
static inline int snd_ump_attach_legacy_rawmidi(struct snd_ump_endpoint *ump,
char *id, int device)
{
return 0;
}
#endif
/*
* Some definitions for UMP
*/
/* MIDI 2.0 Message Type */
enum {
UMP_MSG_TYPE_UTILITY = 0x00,
UMP_MSG_TYPE_SYSTEM = 0x01,
UMP_MSG_TYPE_MIDI1_CHANNEL_VOICE = 0x02,
UMP_MSG_TYPE_DATA = 0x03,
UMP_MSG_TYPE_MIDI2_CHANNEL_VOICE = 0x04,
UMP_MSG_TYPE_EXTENDED_DATA = 0x05,
};
/* MIDI 2.0 SysEx / Data Status; same values for both 7-bit and 8-bit SysEx */
enum {
UMP_SYSEX_STATUS_SINGLE = 0,
UMP_SYSEX_STATUS_START = 1,
UMP_SYSEX_STATUS_CONTINUE = 2,
UMP_SYSEX_STATUS_END = 3,
};
/*
* Helpers for retrieving / filling bits from UMP
*/
/* get the message type (4bit) from a UMP packet (header) */
static inline unsigned char ump_message_type(u32 data)
{
return data >> 28;
}
/* get the group number (0-based, 4bit) from a UMP packet (header) */
static inline unsigned char ump_message_group(u32 data)
{
return (data >> 24) & 0x0f;
}
/* get the MIDI status code (4bit) from a UMP packet (header) */
static inline unsigned char ump_message_status_code(u32 data)
{
return (data >> 20) & 0x0f;
}
/* get the MIDI channel number (0-based, 4bit) from a UMP packet (header) */
static inline unsigned char ump_message_channel(u32 data)
{
return (data >> 16) & 0x0f;
}
/* get the MIDI status + channel combo byte (8bit) from a UMP packet (header) */
static inline unsigned char ump_message_status_channel(u32 data)
{
return (data >> 16) & 0xff;
}
/* compose a UMP packet (header) from type, group and status values */
static inline u32 ump_compose(unsigned char type, unsigned char group,
unsigned char status, unsigned char channel)
{
return ((u32)type << 28) | ((u32)group << 24) | ((u32)status << 20) |
((u32)channel << 16);
}
/* get SysEx message status (for both 7 and 8bits) from a UMP packet (header) */
static inline unsigned char ump_sysex_message_status(u32 data)
{
return (data >> 20) & 0xf;
}
/* get SysEx message length (for both 7 and 8bits) from a UMP packet (header) */
static inline unsigned char ump_sysex_message_length(u32 data)
{
return (data >> 16) & 0xf;
}
#endif /* __SOUND_UMP_H */
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