1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Greybus operations
4 *
5 * Copyright 2015-2016 Google Inc.
6 */
7
8 #include <linux/slab.h>
9
10 #include "audio_manager.h"
11 #include "audio_manager_private.h"
12
13 #define to_gb_audio_module_attr(x) \
14 container_of(x, struct gb_audio_manager_module_attribute, attr)
15
to_gb_audio_module(struct kobject * kobj)16 static inline struct gb_audio_manager_module *to_gb_audio_module(struct kobject *kobj)
17 {
18 return container_of(kobj, struct gb_audio_manager_module, kobj);
19 }
20
21 struct gb_audio_manager_module_attribute {
22 struct attribute attr;
23 ssize_t (*show)(struct gb_audio_manager_module *module,
24 struct gb_audio_manager_module_attribute *attr,
25 char *buf);
26 ssize_t (*store)(struct gb_audio_manager_module *module,
27 struct gb_audio_manager_module_attribute *attr,
28 const char *buf, size_t count);
29 };
30
gb_audio_module_attr_show(struct kobject * kobj,struct attribute * attr,char * buf)31 static ssize_t gb_audio_module_attr_show(struct kobject *kobj,
32 struct attribute *attr, char *buf)
33 {
34 struct gb_audio_manager_module_attribute *attribute;
35 struct gb_audio_manager_module *module;
36
37 attribute = to_gb_audio_module_attr(attr);
38 module = to_gb_audio_module(kobj);
39
40 if (!attribute->show)
41 return -EIO;
42
43 return attribute->show(module, attribute, buf);
44 }
45
gb_audio_module_attr_store(struct kobject * kobj,struct attribute * attr,const char * buf,size_t len)46 static ssize_t gb_audio_module_attr_store(struct kobject *kobj,
47 struct attribute *attr,
48 const char *buf, size_t len)
49 {
50 struct gb_audio_manager_module_attribute *attribute;
51 struct gb_audio_manager_module *module;
52
53 attribute = to_gb_audio_module_attr(attr);
54 module = to_gb_audio_module(kobj);
55
56 if (!attribute->store)
57 return -EIO;
58
59 return attribute->store(module, attribute, buf, len);
60 }
61
62 static const struct sysfs_ops gb_audio_module_sysfs_ops = {
63 .show = gb_audio_module_attr_show,
64 .store = gb_audio_module_attr_store,
65 };
66
gb_audio_module_release(struct kobject * kobj)67 static void gb_audio_module_release(struct kobject *kobj)
68 {
69 struct gb_audio_manager_module *module = to_gb_audio_module(kobj);
70
71 pr_info("Destroying audio module #%d\n", module->id);
72 /* TODO -> delete from list */
73 kfree(module);
74 }
75
gb_audio_module_name_show(struct gb_audio_manager_module * module,struct gb_audio_manager_module_attribute * attr,char * buf)76 static ssize_t gb_audio_module_name_show(struct gb_audio_manager_module *module,
77 struct gb_audio_manager_module_attribute *attr, char *buf)
78 {
79 return sprintf(buf, "%s", module->desc.name);
80 }
81
82 static struct gb_audio_manager_module_attribute gb_audio_module_name_attribute =
83 __ATTR(name, 0664, gb_audio_module_name_show, NULL);
84
gb_audio_module_vid_show(struct gb_audio_manager_module * module,struct gb_audio_manager_module_attribute * attr,char * buf)85 static ssize_t gb_audio_module_vid_show(struct gb_audio_manager_module *module,
86 struct gb_audio_manager_module_attribute *attr, char *buf)
87 {
88 return sprintf(buf, "%d", module->desc.vid);
89 }
90
91 static struct gb_audio_manager_module_attribute gb_audio_module_vid_attribute =
92 __ATTR(vid, 0664, gb_audio_module_vid_show, NULL);
93
gb_audio_module_pid_show(struct gb_audio_manager_module * module,struct gb_audio_manager_module_attribute * attr,char * buf)94 static ssize_t gb_audio_module_pid_show(struct gb_audio_manager_module *module,
95 struct gb_audio_manager_module_attribute *attr, char *buf)
96 {
97 return sprintf(buf, "%d", module->desc.pid);
98 }
99
100 static struct gb_audio_manager_module_attribute gb_audio_module_pid_attribute =
101 __ATTR(pid, 0664, gb_audio_module_pid_show, NULL);
102
gb_audio_module_intf_id_show(struct gb_audio_manager_module * module,struct gb_audio_manager_module_attribute * attr,char * buf)103 static ssize_t gb_audio_module_intf_id_show(struct gb_audio_manager_module *module,
104 struct gb_audio_manager_module_attribute *attr,
105 char *buf)
106 {
107 return sprintf(buf, "%d", module->desc.intf_id);
108 }
109
110 static struct gb_audio_manager_module_attribute
111 gb_audio_module_intf_id_attribute =
112 __ATTR(intf_id, 0664, gb_audio_module_intf_id_show, NULL);
113
gb_audio_module_ip_devices_show(struct gb_audio_manager_module * module,struct gb_audio_manager_module_attribute * attr,char * buf)114 static ssize_t gb_audio_module_ip_devices_show(struct gb_audio_manager_module *module,
115 struct gb_audio_manager_module_attribute *attr,
116 char *buf)
117 {
118 return sprintf(buf, "0x%X", module->desc.ip_devices);
119 }
120
121 static struct gb_audio_manager_module_attribute
122 gb_audio_module_ip_devices_attribute =
123 __ATTR(ip_devices, 0664, gb_audio_module_ip_devices_show, NULL);
124
gb_audio_module_op_devices_show(struct gb_audio_manager_module * module,struct gb_audio_manager_module_attribute * attr,char * buf)125 static ssize_t gb_audio_module_op_devices_show(struct gb_audio_manager_module *module,
126 struct gb_audio_manager_module_attribute *attr,
127 char *buf)
128 {
129 return sprintf(buf, "0x%X", module->desc.op_devices);
130 }
131
132 static struct gb_audio_manager_module_attribute
133 gb_audio_module_op_devices_attribute =
134 __ATTR(op_devices, 0664, gb_audio_module_op_devices_show, NULL);
135
136 static struct attribute *gb_audio_module_default_attrs[] = {
137 &gb_audio_module_name_attribute.attr,
138 &gb_audio_module_vid_attribute.attr,
139 &gb_audio_module_pid_attribute.attr,
140 &gb_audio_module_intf_id_attribute.attr,
141 &gb_audio_module_ip_devices_attribute.attr,
142 &gb_audio_module_op_devices_attribute.attr,
143 NULL, /* need to NULL terminate the list of attributes */
144 };
145 ATTRIBUTE_GROUPS(gb_audio_module_default);
146
147 static struct kobj_type gb_audio_module_type = {
148 .sysfs_ops = &gb_audio_module_sysfs_ops,
149 .release = gb_audio_module_release,
150 .default_groups = gb_audio_module_default_groups,
151 };
152
send_add_uevent(struct gb_audio_manager_module * module)153 static void send_add_uevent(struct gb_audio_manager_module *module)
154 {
155 char name_string[128];
156 char vid_string[64];
157 char pid_string[64];
158 char intf_id_string[64];
159 char ip_devices_string[64];
160 char op_devices_string[64];
161
162 char *envp[] = {
163 name_string,
164 vid_string,
165 pid_string,
166 intf_id_string,
167 ip_devices_string,
168 op_devices_string,
169 NULL
170 };
171
172 snprintf(name_string, 128, "NAME=%s", module->desc.name);
173 snprintf(vid_string, 64, "VID=%d", module->desc.vid);
174 snprintf(pid_string, 64, "PID=%d", module->desc.pid);
175 snprintf(intf_id_string, 64, "INTF_ID=%d", module->desc.intf_id);
176 snprintf(ip_devices_string, 64, "I/P DEVICES=0x%X",
177 module->desc.ip_devices);
178 snprintf(op_devices_string, 64, "O/P DEVICES=0x%X",
179 module->desc.op_devices);
180
181 kobject_uevent_env(&module->kobj, KOBJ_ADD, envp);
182 }
183
gb_audio_manager_module_create(struct gb_audio_manager_module ** module,struct kset * manager_kset,int id,struct gb_audio_manager_module_descriptor * desc)184 int gb_audio_manager_module_create(struct gb_audio_manager_module **module,
185 struct kset *manager_kset,
186 int id, struct gb_audio_manager_module_descriptor *desc)
187 {
188 int err;
189 struct gb_audio_manager_module *m;
190
191 m = kzalloc(sizeof(*m), GFP_ATOMIC);
192 if (!m)
193 return -ENOMEM;
194
195 /* Initialize the node */
196 INIT_LIST_HEAD(&m->list);
197
198 /* Set the module id */
199 m->id = id;
200
201 /* Copy the provided descriptor */
202 memcpy(&m->desc, desc, sizeof(*desc));
203
204 /* set the kset */
205 m->kobj.kset = manager_kset;
206
207 /*
208 * Initialize and add the kobject to the kernel. All the default files
209 * will be created here. As we have already specified a kset for this
210 * kobject, we don't have to set a parent for the kobject, the kobject
211 * will be placed beneath that kset automatically.
212 */
213 err = kobject_init_and_add(&m->kobj, &gb_audio_module_type, NULL, "%d",
214 id);
215 if (err) {
216 pr_err("failed initializing kobject for audio module #%d\n", id);
217 kobject_put(&m->kobj);
218 return err;
219 }
220
221 /*
222 * Notify the object was created
223 */
224 send_add_uevent(m);
225
226 *module = m;
227 pr_info("Created audio module #%d\n", id);
228 return 0;
229 }
230
gb_audio_manager_module_dump(struct gb_audio_manager_module * module)231 void gb_audio_manager_module_dump(struct gb_audio_manager_module *module)
232 {
233 pr_info("audio module #%d name=%s vid=%d pid=%d intf_id=%d i/p devices=0x%X o/p devices=0x%X\n",
234 module->id,
235 module->desc.name,
236 module->desc.vid,
237 module->desc.pid,
238 module->desc.intf_id,
239 module->desc.ip_devices,
240 module->desc.op_devices);
241 }
242