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/*
* Universal sensors core class
*
* Author : Ryunkyun Park <ryun.park@samsung.com>
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/err.h>
struct class *sensors_class;
EXPORT_SYMBOL_GPL(sensors_class);
struct class *sensors_event_class;
EXPORT_SYMBOL_GPL(sensors_event_class);
static atomic_t sensor_count;
static struct device *symlink_dev;
/*
* Create sysfs interface
*/
static void set_sensor_attr(struct device *dev,
struct device_attribute *attributes[])
{
int i;
for (i = 0; attributes[i] != NULL; i++)
if ((device_create_file(dev, attributes[i])) < 0)
pr_err("[SENSOR CORE] fail device_create_file"\
"(dev, attributes[%d])\n", i);
}
int sensors_create_symlink(struct kobject *target,
const char *name)
{
int err = 0;
if (symlink_dev == NULL) {
pr_err("%s, symlink_dev is NULL!!!\n", __func__);
return err ;
}
err = sysfs_create_link(&symlink_dev->kobj, target, name);
if (err < 0) {
pr_err("%s, %s failed!(%d)\n", __func__, name, err);
return err;
}
return err;
}
EXPORT_SYMBOL_GPL(sensors_create_symlink);
void sensors_remove_symlink(struct kobject *target,
const char *name)
{
if (symlink_dev == NULL) {
pr_err("%s, symlink_dev is NULL!!!\n", __func__);
return;
}
sysfs_delete_link(&symlink_dev->kobj, target, name);
}
EXPORT_SYMBOL_GPL(sensors_remove_symlink);
int sensors_register(struct device *dev, void *drvdata,
struct device_attribute *attributes[], char *name)
{
int ret = 0;
if (!sensors_class) {
sensors_class = class_create(THIS_MODULE, "sensors");
if (IS_ERR(sensors_class))
return PTR_ERR(sensors_class);
}
dev = device_create(sensors_class, NULL, 0, drvdata, "%s", name);
if (IS_ERR(dev)) {
ret = PTR_ERR(dev);
pr_err("[SENSORS CORE] device_create failed!"\
"[%d]\n", ret);
return ret;
}
set_sensor_attr(dev, attributes);
atomic_inc(&sensor_count);
return 0;
}
EXPORT_SYMBOL_GPL(sensors_register);
void sensors_unregister(struct device *dev,
struct device_attribute *attributes[])
{
int i;
for (i = 0; attributes[i] != NULL; i++)
device_remove_file(dev, attributes[i]);
}
EXPORT_SYMBOL_GPL(sensors_unregister);
void destroy_sensor_class(void)
{
if (sensors_class) {
class_destroy(sensors_class);
sensors_class = NULL;
}
if (sensors_event_class) {
device_destroy(sensors_event_class, symlink_dev->devt);
class_destroy(sensors_event_class);
symlink_dev = NULL;
sensors_event_class = NULL;
}
}
EXPORT_SYMBOL_GPL(destroy_sensor_class);
static int __init sensors_class_init(void)
{
pr_info("[SENSORS CORE] sensors_class_init\n");
sensors_class = class_create(THIS_MODULE, "sensors");
if (IS_ERR(sensors_class)) {
pr_err("%s, create sensors_class is failed.(err=%ld)\n",
__func__, IS_ERR(sensors_class));
return PTR_ERR(sensors_class);
}
/* For symbolic link */
sensors_event_class = class_create(THIS_MODULE, "sensor_event");
if (IS_ERR(sensors_event_class)) {
pr_err("%s, create sensors_class is failed.(err=%ld)\n",
__func__, IS_ERR(sensors_event_class));
return PTR_ERR(sensors_event_class);
}
symlink_dev = device_create(sensors_event_class, NULL, 0, NULL,
"%s", "symlink");
if (IS_ERR(symlink_dev)) {
pr_err("[SENSORS CORE] symlink_dev create failed!"\
"[%ld]\n", IS_ERR(symlink_dev));
return PTR_ERR(symlink_dev);
}
atomic_set(&sensor_count, 0);
sensors_class->dev_uevent = NULL;
pr_info("[SENSORS CORE] sensors_class_init succcess\n");
return 0;
}
static void __exit sensors_class_exit(void)
{
if (sensors_class || sensors_event_class) {
class_destroy(sensors_class);
sensors_class = NULL;
class_destroy(sensors_event_class);
sensors_event_class = NULL;
}
}
subsys_initcall(sensors_class_init);
module_exit(sensors_class_exit);
MODULE_DESCRIPTION("Universal sensors core class");
MODULE_AUTHOR("Ryunkyun Park <ryun.park@samsung.com>");
MODULE_LICENSE("GPL");
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