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alistair23-linux/drivers/staging/greybus/audio_manager_private.h

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staging: greybus: correct SPDX License Identifier Replace SPDX License Identifier comments with C comments. Reported by checkpatch. Signed-off-by: Ioannis Valasakis <code@wizofe.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-11-09 06:54:00 -07:00
/* SPDX-License-Identifier: GPL-2.0 */
greybus: audio: Add Audio Manager This is a simple module that keeps a list of connected GB audio modules. Whenever a device is attached, an appropriate uevent is sent to userspace: UDEV [4941.803215] add /kernel/gb_audio_manager/0 (gb_audio_manager) ACTION=add CPORT=99 DEVICES=0x10 DEVPATH=/kernel/gb_audio_manager/0 NAME=naim PID=64 SEQNUM=1828 SLOT=2 SUBSYSTEM=gb_audio_manager USEC_INITIALIZED=802416 VID=128 And whenever removed: UDEV [4941.836588] remove /kernel/gb_audio_manager/0 (gb_audio_manager) ACTION=remove DEVPATH=/kernel/gb_audio_manager/0 SEQNUM=1833 SUBSYSTEM=gb_audio_manager USEC_INITIALIZED=835681 The API consists of functions for adding, removing and inspecting added device module descriptions (struct gb_audio_module): int gb_audio_manager_add(struct gb_audio_module_descriptor *desc); int gb_audio_manager_remove(int id); int gb_audio_manager_remove_all(void); struct gb_audio_module* gb_audio_manager_get_module(int id); void gb_audio_manager_put_module(struct gb_audio_module *module); int gb_audio_manager_dump_module(int id); void gb_audio_manager_dump_all(void); Devices can be inspected through sysfs in /sys/kernel/gb_audio_manager/{id}/* If GB_AUDIO_MANAGER_SYSFS is exported as 'true', managing devices can be done via the SYSFS as well. For instance: echo name=naim slot=2 vid=128 pid=64 cport=99 devices=0x10 > /sys/kernel/gb_audio_manager/add echo all > /sys/kernel/gb_audio_manager/dump echo 2 > /sys/kernel/gb_audio_manager/dump echo 2 > /sys/kernel/gb_audio_manager/remove Signed-off-by: Svetlin Ankov <ankov_svetlin@projectara.com> Signed-off-by: Mark Greer <mgreer@animalcreek.com> Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
2016-01-13 14:07:48 -07:00
/*
* Greybus operations
*
* Copyright 2015-2016 Google Inc.
*/
#ifndef _GB_AUDIO_MANAGER_PRIVATE_H_
#define _GB_AUDIO_MANAGER_PRIVATE_H_
#include <linux/kobject.h>
#include "audio_manager.h"
int gb_audio_manager_module_create(
struct gb_audio_manager_module **module,
struct kset *manager_kset,
int id, struct gb_audio_manager_module_descriptor *desc);
/* module destroyed via kobject_put */
void gb_audio_manager_module_dump(struct gb_audio_manager_module *module);
/* sysfs control */
void gb_audio_manager_sysfs_init(struct kobject *kobj);
#endif /* _GB_AUDIO_MANAGER_PRIVATE_H_ */