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 #define to_gb_audio_module(x) \ 16 container_of(x, struct gb_audio_manager_module, kobj) 17 18 struct gb_audio_manager_module_attribute { 19 struct attribute attr; 20 ssize_t (*show)(struct gb_audio_manager_module *module, 21 struct gb_audio_manager_module_attribute *attr, 22 char *buf); 23 ssize_t (*store)(struct gb_audio_manager_module *module, 24 struct gb_audio_manager_module_attribute *attr, 25 const char *buf, size_t count); 26 }; 27 28 static ssize_t gb_audio_module_attr_show(struct kobject *kobj, 29 struct attribute *attr, char *buf) 30 { 31 struct gb_audio_manager_module_attribute *attribute; 32 struct gb_audio_manager_module *module; 33 34 attribute = to_gb_audio_module_attr(attr); 35 module = to_gb_audio_module(kobj); 36 37 if (!attribute->show) 38 return -EIO; 39 40 return attribute->show(module, attribute, buf); 41 } 42 43 static ssize_t gb_audio_module_attr_store(struct kobject *kobj, 44 struct attribute *attr, 45 const char *buf, size_t len) 46 { 47 struct gb_audio_manager_module_attribute *attribute; 48 struct gb_audio_manager_module *module; 49 50 attribute = to_gb_audio_module_attr(attr); 51 module = to_gb_audio_module(kobj); 52 53 if (!attribute->store) 54 return -EIO; 55 56 return attribute->store(module, attribute, buf, len); 57 } 58 59 static const struct sysfs_ops gb_audio_module_sysfs_ops = { 60 .show = gb_audio_module_attr_show, 61 .store = gb_audio_module_attr_store, 62 }; 63 64 static void gb_audio_module_release(struct kobject *kobj) 65 { 66 struct gb_audio_manager_module *module = to_gb_audio_module(kobj); 67 68 pr_info("Destroying audio module #%d\n", module->id); 69 /* TODO -> delete from list */ 70 kfree(module); 71 } 72 73 static ssize_t gb_audio_module_name_show( 74 struct gb_audio_manager_module *module, 75 struct gb_audio_manager_module_attribute *attr, char *buf) 76 { 77 return sprintf(buf, "%s", module->desc.name); 78 } 79 80 static struct gb_audio_manager_module_attribute gb_audio_module_name_attribute = 81 __ATTR(name, 0664, gb_audio_module_name_show, NULL); 82 83 static ssize_t gb_audio_module_vid_show( 84 struct gb_audio_manager_module *module, 85 struct gb_audio_manager_module_attribute *attr, char *buf) 86 { 87 return sprintf(buf, "%d", module->desc.vid); 88 } 89 90 static struct gb_audio_manager_module_attribute gb_audio_module_vid_attribute = 91 __ATTR(vid, 0664, gb_audio_module_vid_show, NULL); 92 93 static ssize_t gb_audio_module_pid_show( 94 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); 102 103 static ssize_t gb_audio_module_intf_id_show( 104 struct gb_audio_manager_module *module, 105 struct gb_audio_manager_module_attribute *attr, 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); 113 114 static ssize_t gb_audio_module_ip_devices_show( 115 struct gb_audio_manager_module *module, 116 struct gb_audio_manager_module_attribute *attr, 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); 124 125 static ssize_t gb_audio_module_op_devices_show( 126 struct gb_audio_manager_module *module, 127 struct gb_audio_manager_module_attribute *attr, 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 }; 145 146 static struct kobj_type gb_audio_module_type = { 147 .sysfs_ops = &gb_audio_module_sysfs_ops, 148 .release = gb_audio_module_release, 149 .default_attrs = gb_audio_module_default_attrs, 150 }; 151 152 static void send_add_uevent(struct gb_audio_manager_module *module) 153 { 154 char name_string[128]; 155 char vid_string[64]; 156 char pid_string[64]; 157 char intf_id_string[64]; 158 char ip_devices_string[64]; 159 char op_devices_string[64]; 160 161 char *envp[] = { 162 name_string, 163 vid_string, 164 pid_string, 165 intf_id_string, 166 ip_devices_string, 167 op_devices_string, 168 NULL 169 }; 170 171 snprintf(name_string, 128, "NAME=%s", module->desc.name); 172 snprintf(vid_string, 64, "VID=%d", module->desc.vid); 173 snprintf(pid_string, 64, "PID=%d", module->desc.pid); 174 snprintf(intf_id_string, 64, "INTF_ID=%d", module->desc.intf_id); 175 snprintf(ip_devices_string, 64, "I/P DEVICES=0x%X", 176 module->desc.ip_devices); 177 snprintf(op_devices_string, 64, "O/P DEVICES=0x%X", 178 module->desc.op_devices); 179 180 kobject_uevent_env(&module->kobj, KOBJ_ADD, envp); 181 } 182 183 int gb_audio_manager_module_create( 184 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 } 230 231 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