8db00736d3
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>
29 lines
637 B
C
29 lines
637 B
C
/*
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* Greybus operations
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*
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* Copyright 2015-2016 Google Inc.
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*
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* Released under the GPLv2 only.
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*/
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#ifndef _GB_AUDIO_MANAGER_PRIVATE_H_
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#define _GB_AUDIO_MANAGER_PRIVATE_H_
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#include <linux/kobject.h>
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#include "audio_manager.h"
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int gb_audio_manager_module_create(
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struct gb_audio_manager_module **module,
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struct kset *manager_kset,
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int id, struct gb_audio_manager_module_descriptor *desc);
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/* module destroyed via kobject_put */
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void gb_audio_manager_module_dump(struct gb_audio_manager_module *module);
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/* sysfs control */
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void gb_audio_manager_sysfs_init(struct kobject *kobj);
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#endif /* _GB_AUDIO_MANAGER_PRIVATE_H_ */
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