audio_manager_sysfs.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Greybus operations
  4 *
  5 * Copyright 2015-2016 Google Inc.
  6 */
  7
  8#include <linux/string.h>
  9#include <linux/sysfs.h>
 10
 11#include "audio_manager.h"
 12#include "audio_manager_private.h"
 13
 14static ssize_t manager_sysfs_add_store(struct kobject *kobj,
 15				       struct kobj_attribute *attr,
 16				       const char *buf, size_t count)
 17{
 18	struct gb_audio_manager_module_descriptor desc = { {0} };
 19
 20	int num = sscanf(buf,
 21			"name=%" GB_AUDIO_MANAGER_MODULE_NAME_LEN_SSCANF
 22			"s vid=%d pid=%d intf_id=%d i/p devices=0x%X o/p devices=0x%X",
 23			desc.name, &desc.vid, &desc.pid, &desc.intf_id,
 24			&desc.ip_devices, &desc.op_devices);
 25
 26	if (num != 7)
 27		return -EINVAL;
 28
 29	num = gb_audio_manager_add(&desc);
 30	if (num < 0)
 31		return -EINVAL;
 32
 33	return count;
 34}
 35
 36static struct kobj_attribute manager_add_attribute =
 37	__ATTR(add, 0664, NULL, manager_sysfs_add_store);
 38
 39static ssize_t manager_sysfs_remove_store(struct kobject *kobj,
 40					  struct kobj_attribute *attr,
 41					  const char *buf, size_t count)
 42{
 43	int id;
 44
 45	int num = kstrtoint(buf, 10, &id);
 46
 47	if (num != 1)
 48		return -EINVAL;
 49
 50	num = gb_audio_manager_remove(id);
 51	if (num)
 52		return num;
 53
 54	return count;
 55}
 56
 57static struct kobj_attribute manager_remove_attribute =
 58	__ATTR(remove, 0664, NULL, manager_sysfs_remove_store);
 59
 60static ssize_t manager_sysfs_dump_store(struct kobject *kobj,
 61					struct kobj_attribute *attr,
 62					const char *buf, size_t count)
 63{
 64	int id;
 65
 66	int num = kstrtoint(buf, 10, &id);
 67
 68	if (num == 1) {
 69		num = gb_audio_manager_dump_module(id);
 70		if (num)
 71			return num;
 72	} else if (!strncmp("all", buf, 3)) {
 73		gb_audio_manager_dump_all();
 74	} else {
 75		return -EINVAL;
 76	}
 77
 78	return count;
 79}
 80
 81static struct kobj_attribute manager_dump_attribute =
 82	__ATTR(dump, 0664, NULL, manager_sysfs_dump_store);
 83
 84static void manager_sysfs_init_attribute(struct kobject *kobj,
 85					 struct kobj_attribute *kattr)
 86{
 87	int err;
 88
 89	err = sysfs_create_file(kobj, &kattr->attr);
 90	if (err) {
 91		pr_warn("creating the sysfs entry for %s failed: %d\n",
 92			kattr->attr.name, err);
 93	}
 94}
 95
 96void gb_audio_manager_sysfs_init(struct kobject *kobj)
 97{
 98	manager_sysfs_init_attribute(kobj, &manager_add_attribute);
 99	manager_sysfs_init_attribute(kobj, &manager_remove_attribute);
100	manager_sysfs_init_attribute(kobj, &manager_dump_attribute);
101}