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90 lines
2.3 KiB
90 lines
2.3 KiB
/*
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* driver/misc/samsung/sec_class.c
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*
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* COPYRIGHT(C) 2014-2018 Samsung Electronics Co., Ltd. All Right Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s() " fmt, __func__
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/sec_class.h>
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#include <linux/module.h>
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/* CAUTION : Do not be declared as external sec_class */
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static struct class *sec_class;
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static atomic_t sec_dev;
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static int sec_class_match_device_by_name(struct device *dev, const void *data)
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{
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const char *name = data;
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return sysfs_streq(name, dev_name(dev));
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}
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struct device *sec_dev_get_by_name(const char *name)
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{
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return class_find_device(sec_class, NULL, name,
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sec_class_match_device_by_name);
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}
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EXPORT_SYMBOL(sec_dev_get_by_name);
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struct device *___sec_device_create(void *drvdata, const char *fmt)
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{
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struct device *dev;
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if (unlikely(!sec_class)) {
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pr_err("Not yet created class(sec)!\n");
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BUG();
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}
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if (IS_ERR(sec_class)) {
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pr_err("Failed to create class(sec) %ld\n", PTR_ERR(sec_class));
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BUG();
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}
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dev = device_create(sec_class, NULL, atomic_inc_return(&sec_dev),
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drvdata, "%s", fmt);
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if (IS_ERR(dev))
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pr_err("Failed to create device %s %ld\n", fmt, PTR_ERR(dev));
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else
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pr_debug("%s : %d\n", fmt, dev->devt);
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return dev;
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}
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EXPORT_SYMBOL(___sec_device_create);
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void sec_device_destroy(dev_t devt)
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{
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if (unlikely(!devt)) {
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pr_err("Not allowed to destroy dev\n");
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} else {
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pr_info("%d\n", devt);
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device_destroy(sec_class, devt);
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}
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}
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EXPORT_SYMBOL_GPL(sec_device_destroy);
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static int __init sec_class_create(void)
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{
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sec_class = class_create(THIS_MODULE, "sec");
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if (unlikely(IS_ERR(sec_class))) {
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pr_err("Failed to create class(sec) %ld\n", PTR_ERR(sec_class));
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return PTR_ERR(sec_class);
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}
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return 0;
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}
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arch_initcall(sec_class_create);
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MODULE_DESCRIPTION("sec-class");
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MODULE_LICENSE("GPL v2");
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