drivers/staging/greybus/audio_manager_module.c

   1 /*
   2  * Greybus operations
   3  *
   4  * Copyright 2015-2016 Google Inc.
   5  *
   6  * Released under the GPLv2 only.
   7  */
   8
   9 #include <linux/slab.h>
  10
  11 #include "audio_manager.h"
  12 #include "audio_manager_private.h"
  13
  14 #define to_gb_audio_module_attr(x)      \
  15                 container_of(x, struct gb_audio_manager_module_attribute, attr)
  16 #define to_gb_audio_module(x)           \
  17                 container_of(x, struct gb_audio_manager_module, kobj)
  18
  19 struct gb_audio_manager_module_attribute {
  20         struct attribute attr;
  21         ssize_t (*show)(struct gb_audio_manager_module *module,
  22                         struct gb_audio_manager_module_attribute *attr,
  23                         char *buf);
  24         ssize_t (*store)(struct gb_audio_manager_module *module,
  25                          struct gb_audio_manager_module_attribute *attr,
  26                          const char *buf, size_t count);
  27 };
  28
  29 static ssize_t gb_audio_module_attr_show(
  30         struct kobject *kobj, struct attribute *attr, char *buf)
  31 {
  32         struct gb_audio_manager_module_attribute *attribute;
  33         struct gb_audio_manager_module *module;
  34
  35         attribute = to_gb_audio_module_attr(attr);
  36         module = to_gb_audio_module(kobj);
  37
  38         if (!attribute->show)
  39                 return -EIO;
  40
  41         return attribute->show(module, attribute, buf);
  42 }
  43
  44 static ssize_t gb_audio_module_attr_store(struct kobject *kobj,
  45                                           struct attribute *attr,
  46                                           const char *buf, size_t len)
  47 {
  48         struct gb_audio_manager_module_attribute *attribute;
  49         struct gb_audio_manager_module *module;
  50
  51         attribute = to_gb_audio_module_attr(attr);
  52         module = to_gb_audio_module(kobj);
  53
  54         if (!attribute->store)
  55                 return -EIO;
  56
  57         return attribute->store(module, attribute, buf, len);
  58 }
  59
  60 static const struct sysfs_ops gb_audio_module_sysfs_ops = {
  61         .show = gb_audio_module_attr_show,
  62         .store = gb_audio_module_attr_store,
  63 };
  64
  65 static void gb_audio_module_release(struct kobject *kobj)
  66 {
  67         struct gb_audio_manager_module *module = to_gb_audio_module(kobj);
  68
  69         pr_info("Destroying audio module #%d\n", module->id);
  70         /* TODO -> delete from list */
  71         kfree(module);
  72 }
  73
  74 static ssize_t gb_audio_module_name_show(
  75         struct gb_audio_manager_module *module,
  76         struct gb_audio_manager_module_attribute *attr, char *buf)
  77 {
  78         return sprintf(buf, "%s", module->desc.name);
  79 }
  80
  81 static struct gb_audio_manager_module_attribute gb_audio_module_name_attribute =
  82         __ATTR(name, 0664, gb_audio_module_name_show, NULL);
  83
  84 static ssize_t gb_audio_module_vid_show(
  85         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
  94 static ssize_t gb_audio_module_pid_show(
  95         struct gb_audio_manager_module *module,
  96         struct gb_audio_manager_module_attribute *attr, char *buf)
  97 {
  98         return sprintf(buf, "%d", module->desc.pid);
  99 }
 100
 101 static struct gb_audio_manager_module_attribute gb_audio_module_pid_attribute =
 102         __ATTR(pid, 0664, gb_audio_module_pid_show, NULL);
 103
 104 static ssize_t gb_audio_module_intf_id_show(
 105         struct gb_audio_manager_module *module,
 106         struct gb_audio_manager_module_attribute *attr, char *buf)
 107 {
 108         return sprintf(buf, "%d", module->desc.intf_id);
 109 }
 110
 111 static struct gb_audio_manager_module_attribute
 112                                         gb_audio_module_intf_id_attribute =
 113         __ATTR(intf_id, 0664, gb_audio_module_intf_id_show, NULL);
 114
 115 static ssize_t gb_audio_module_ip_devices_show(
 116         struct gb_audio_manager_module *module,
 117         struct gb_audio_manager_module_attribute *attr, char *buf)
 118 {
 119         return sprintf(buf, "0x%X", module->desc.ip_devices);
 120 }
 121
 122 static struct gb_audio_manager_module_attribute
 123                                         gb_audio_module_ip_devices_attribute =
 124         __ATTR(ip_devices, 0664, gb_audio_module_ip_devices_show, NULL);
 125
 126 static ssize_t gb_audio_module_op_devices_show(
 127         struct gb_audio_manager_module *module,
 128         struct gb_audio_manager_module_attribute *attr, char *buf)
 129 {
 130         return sprintf(buf, "0x%X", module->desc.op_devices);
 131 }
 132
 133 static struct gb_audio_manager_module_attribute
 134                                         gb_audio_module_op_devices_attribute =
 135         __ATTR(op_devices, 0664, gb_audio_module_op_devices_show, NULL);
 136
 137 static struct attribute *gb_audio_module_default_attrs[] = {
 138         &gb_audio_module_name_attribute.attr,
 139         &gb_audio_module_vid_attribute.attr,
 140         &gb_audio_module_pid_attribute.attr,
 141         &gb_audio_module_intf_id_attribute.attr,
 142         &gb_audio_module_ip_devices_attribute.attr,
 143         &gb_audio_module_op_devices_attribute.attr,
 144         NULL,   /* need to NULL terminate the list of attributes */
 145 };
 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_attrs = gb_audio_module_default_attrs,
 151 };
 152
 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
 184 int gb_audio_manager_module_create(
 185         struct gb_audio_manager_module **module,
 186         struct kset *manager_kset,
 187         int id, struct gb_audio_manager_module_descriptor *desc)
 188 {
 189         int err;
 190         struct gb_audio_manager_module *m;
 191
 192         m = kzalloc(sizeof(*m), GFP_ATOMIC);
 193         if (!m)
 194                 return -ENOMEM;
 195
 196         /* Initialize the node */
 197         INIT_LIST_HEAD(&m->list);
 198
 199         /* Set the module id */
 200         m->id = id;
 201
 202         /* Copy the provided descriptor */
 203         memcpy(&m->desc, desc, sizeof(*desc));
 204
 205         /* set the kset */
 206         m->kobj.kset = manager_kset;
 207
 208         /*
 209          * Initialize and add the kobject to the kernel.  All the default files
 210          * will be created here.  As we have already specified a kset for this
 211          * kobject, we don't have to set a parent for the kobject, the kobject
 212          * will be placed beneath that kset automatically.
 213          */
 214         err = kobject_init_and_add(&m->kobj, &gb_audio_module_type, NULL, "%d",
 215                                    id);
 216         if (err) {
 217                 pr_err("failed initializing kobject for audio module #%d\n",
 218                        id);
 219                 kobject_put(&m->kobj);
 220                 return err;
 221         }
 222
 223         /*
 224          * Notify the object was created
 225          */
 226         send_add_uevent(m);
 227
 228         *module = m;
 229         pr_info("Created audio module #%d\n", id);
 230         return 0;
 231 }
 232
 233 void gb_audio_manager_module_dump(struct gb_audio_manager_module *module)
 234 {
 235         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",
 236                 module->id,
 237                 module->desc.name,
 238                 module->desc.vid,
 239                 module->desc.pid,
 240                 module->desc.intf_id,
 241                 module->desc.ip_devices,
 242                 module->desc.op_devices);
 243 }