1 /*
2 * Greybus operations
3 *
4 * Copyright 2015-2016 Google Inc.
5 *
6 * Released under the GPLv2 only.
7 */
8
9 #include <linux/string.h>
10 #include <linux/sysfs.h>
11
12 #include "audio_manager.h"
13 #include "audio_manager_private.h"
14
manager_sysfs_add_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t count)15 static ssize_t manager_sysfs_add_store(
16 struct kobject *kobj, struct kobj_attribute *attr,
17 const char *buf, size_t count)
18 {
19 struct gb_audio_manager_module_descriptor desc = { {0} };
20
21 int num = sscanf(buf,
22 "name=%" GB_AUDIO_MANAGER_MODULE_NAME_LEN_SSCANF "s "
23 "slot=%d vid=%d pid=%d cport=%d i/p devices=0x%X"
24 "o/p devices=0x%X",
25 desc.name, &desc.slot, &desc.vid, &desc.pid,
26 &desc.cport, &desc.ip_devices, &desc.op_devices);
27
28 if (num != 7)
29 return -EINVAL;
30
31 num = gb_audio_manager_add(&desc);
32 if (num < 0)
33 return -EINVAL;
34
35 return count;
36 }
37
38 static struct kobj_attribute manager_add_attribute =
39 __ATTR(add, 0664, NULL, manager_sysfs_add_store);
40
manager_sysfs_remove_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t count)41 static ssize_t manager_sysfs_remove_store(
42 struct kobject *kobj, struct kobj_attribute *attr,
43 const char *buf, size_t count)
44 {
45 int id;
46
47 int num = sscanf(buf, "%d", &id);
48
49 if (num != 1)
50 return -EINVAL;
51
52 num = gb_audio_manager_remove(id);
53 if (num)
54 return num;
55
56 return count;
57 }
58
59 static struct kobj_attribute manager_remove_attribute =
60 __ATTR(remove, 0664, NULL, manager_sysfs_remove_store);
61
manager_sysfs_dump_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t count)62 static ssize_t manager_sysfs_dump_store(
63 struct kobject *kobj, struct kobj_attribute *attr,
64 const char *buf, size_t count)
65 {
66 int id;
67
68 int num = sscanf(buf, "%d", &id);
69
70 if (num == 1) {
71 num = gb_audio_manager_dump_module(id);
72 if (num)
73 return num;
74 } else if (!strncmp("all", buf, 3))
75 gb_audio_manager_dump_all();
76 else
77 return -EINVAL;
78
79 return count;
80 }
81
82 static struct kobj_attribute manager_dump_attribute =
83 __ATTR(dump, 0664, NULL, manager_sysfs_dump_store);
84
manager_sysfs_init_attribute(struct kobject * kobj,struct kobj_attribute * kattr)85 static void manager_sysfs_init_attribute(
86 struct kobject *kobj, struct kobj_attribute *kattr)
87 {
88 int err;
89
90 err = sysfs_create_file(kobj, &kattr->attr);
91 if (err) {
92 pr_warn("creating the sysfs entry for %s failed: %d\n",
93 kattr->attr.name, err);
94 }
95 }
96
gb_audio_manager_sysfs_init(struct kobject * kobj)97 void gb_audio_manager_sysfs_init(struct kobject *kobj)
98 {
99 manager_sysfs_init_attribute(kobj, &manager_add_attribute);
100 manager_sysfs_init_attribute(kobj, &manager_remove_attribute);
101 manager_sysfs_init_attribute(kobj, &manager_dump_attribute);
102 }
103