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This patch introduces a new ALSA sequencer client for the kernel UMP object, snd-seq-ump-client. It's a UMP version of snd-seq-midi driver, while this driver creates a sequencer client per UMP endpoint which contains (fixed) 16 ports. The UMP rawmidi device is opened in APPEND mode for output, so that multiple sequencer clients can share the same UMP endpoint, as well as the legacy UMP rawmidi devices that are opened in APPEND mode, too. For input, on the other hand, the incoming data is processed on the fly in the dedicated hook, hence it doesn't open a rawmidi device. The UMP packet group is updated upon delivery depending on the target sequencer port (which corresponds to the actual UMP group). Each sequencer port sets a new port type bit, SNDRV_SEQ_PORT_TYPE_MIDI_UMP, in addition to the other standard types for MIDI. Reviewed-by: Jaroslav Kysela <perex@perex.cz> Link: https://lore.kernel.org/r/20230523075358.9672-33-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef __SOUND_SEQ_DEVICE_H
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#define __SOUND_SEQ_DEVICE_H
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/*
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* ALSA sequencer device management
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* Copyright (c) 1999 by Takashi Iwai <tiwai@suse.de>
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*/
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/*
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* registered device information
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*/
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struct snd_seq_device {
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/* device info */
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struct snd_card *card; /* sound card */
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int device; /* device number */
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const char *id; /* driver id */
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char name[80]; /* device name */
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int argsize; /* size of the argument */
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void *driver_data; /* private data for driver */
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void *private_data; /* private data for the caller */
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void (*private_free)(struct snd_seq_device *device);
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struct device dev;
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};
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#define to_seq_dev(_dev) \
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container_of(_dev, struct snd_seq_device, dev)
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/* sequencer driver */
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/* driver operators
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* probe:
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* Initialize the device with given parameters.
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* Typically,
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* 1. call snd_hwdep_new
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* 2. allocate private data and initialize it
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* 3. call snd_hwdep_register
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* 4. store the instance to dev->driver_data pointer.
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*
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* remove:
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* Release the private data.
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* Typically, call snd_device_free(dev->card, dev->driver_data)
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*/
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struct snd_seq_driver {
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struct device_driver driver;
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char *id;
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int argsize;
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};
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#define to_seq_drv(_drv) \
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container_of(_drv, struct snd_seq_driver, driver)
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/*
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* prototypes
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*/
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#ifdef CONFIG_MODULES
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void snd_seq_device_load_drivers(void);
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#else
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#define snd_seq_device_load_drivers()
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#endif
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int snd_seq_device_new(struct snd_card *card, int device, const char *id,
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int argsize, struct snd_seq_device **result);
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#define SNDRV_SEQ_DEVICE_ARGPTR(dev) (void *)((char *)(dev) + sizeof(struct snd_seq_device))
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int __must_check __snd_seq_driver_register(struct snd_seq_driver *drv,
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struct module *mod);
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#define snd_seq_driver_register(drv) \
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__snd_seq_driver_register(drv, THIS_MODULE)
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void snd_seq_driver_unregister(struct snd_seq_driver *drv);
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#define module_snd_seq_driver(drv) \
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module_driver(drv, snd_seq_driver_register, snd_seq_driver_unregister)
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/*
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* id strings for generic devices
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*/
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#define SNDRV_SEQ_DEV_ID_MIDISYNTH "seq-midi"
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#define SNDRV_SEQ_DEV_ID_OPL3 "opl3-synth"
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#define SNDRV_SEQ_DEV_ID_UMP "seq-ump-client"
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#endif /* __SOUND_SEQ_DEVICE_H */
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