drivers/amlogic/efuse_unifykey/efuse_burn.c - manifest_repos/kernel - Git at Google

 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
 /*
  * Copyright (c) 2019 Amlogic, Inc. All rights reserved.
  */

 #include <linux/cdev.h>
 #include <linux/types.h>
 #include <linux/fs.h>
 #include <linux/device.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>
 #include <linux/platform_device.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/clk.h>
 #include "efuse.h"
 #include <linux/amlogic/efuse.h>
 #include <linux/io.h>
 #include <linux/compat.h>
 #include "efuse_burn.h"

 #define EFUSE_BURN_DEVICE_NAME   "efuse_burn"
 #define EFUSE_BURN_CLASS_NAME    "efuse_burn"

 static struct aml_efuse_burn_dev *pefuse_burn_dev;

 static int efuse_burn_open(struct inode *inode, struct file *file)
 {
 	struct aml_efuse_burn_dev *devp;

 	devp = container_of(inode->i_cdev, struct aml_efuse_burn_dev, cdev);
 	file->private_data = devp;

 	//printk(KERN_NOTICE "%s:%d\n", __func__, __LINE__);
 	pr_notice("%s:%d\n", __func__, __LINE__);

 	return 0;
 }

 static int efuse_burn_release(struct inode *inode, struct file *file)
 {
 	file->private_data = NULL;
 	return 0;
 }

 static loff_t efuse_burn_llseek(struct file *filp, loff_t off, int whence)
 {
 	return 0;
 }

 static long efuse_burn_unlocked_ioctl(struct file *file,
 				 unsigned int cmd, unsigned long arg)
 {
 	long ret = -ENOTTY;
 	void __user *argp = (void __user *)arg;
 	struct efuse_burn_info info;

 	pr_notice("%s:%d\n", __func__, __LINE__);
 	switch (cmd) {
 	case EFUSE_BURN_CHECK_KEY:
 		if (copy_from_user((void *)&info, argp, sizeof(info))) {
 			pr_err("%s: copy_from_user fail\n", __func__);
 			return -EFAULT;
 		}
 		if (efuse_burn_lockable_is_cfg(info.itemname) == 0) {
 			info.status = efuse_burn_check_burned(info.itemname);
 		} else {
 			pr_err("%s: efuse_burn check item not cfg\n", __func__);
 			return -EFAULT;
 		}
 		if (copy_to_user(argp, &info, sizeof(info))) {
 			pr_err("%s: copy_to_user fail\n", __func__);
 			return -EFAULT;
 		}
 		break;
 	}

 	return ret;
 }

 #ifdef CONFIG_COMPAT
 static long efuse_burn_compat_ioctl(struct file *filp,
 			       unsigned int cmd, unsigned long args)
 {
 	long ret;

 	args = (unsigned long)compat_ptr(args);
 	ret = efuse_burn_unlocked_ioctl(filp, cmd, args);

 	return ret;
 }
 #endif

 static ssize_t efuse_burn_read(struct file *file, char __user *buf,
 			  size_t count, loff_t *ppos)
 {
 	pr_notice("%s:%d\n", __func__, __LINE__);
 	return 0;
 }

 static ssize_t efuse_burn_write(struct file *file,
 			   const char __user *buf, size_t count, loff_t *ppos)
 {
 	struct aml_efuse_burn_dev *devp;
 	ssize_t ret;
 	char *op = NULL;

 	devp = file->private_data;
 	//pr_notice("%s:%d, sizeof(loff_t):%d\n",
 	//	__func__, __LINE__, sizeof(loff_t));
 	//pr_notice("pos=%lld,count=%d\n", *ppos, count);
 	if (count != devp->efuse_pattern_size) {
 		ret = -EINVAL;
 		pr_err("efuse burn: bad pattern size, only support size %d!\n",
 		       devp->efuse_pattern_size);
 		goto exit;
 	}
 	op = kzalloc(sizeof(char) * count, GFP_KERNEL);
 	if (!op) {
 		ret = -ENOMEM;
 		pr_err("efuse burn: failed to allocate memory!\n");
 		goto exit;
 	}

 	memset(op, 0, count);
 	if (copy_from_user(op, buf, count)) {
 		pr_err("%s: copy_from_user fail\n", __func__);
 		kfree(op);
 		ret = -EFAULT;
 		goto exit;
 	}

 	ret = efuse_amlogic_set(op, count);
 	kfree(op);

 	if (ret) {
 		pr_err("efuse burn: pattern programming fail! ret: %d\n",
 		       (unsigned int)ret);
 		ret = -EINVAL;
 		goto exit;
 	}

 	pr_info("efuse burn: pattern programming success!\n");

 	ret = count;

 exit:
 	return ret;
 }

 static const struct file_operations efuse_burn_fops = {
 	.owner      = THIS_MODULE,
 	.llseek     = efuse_burn_llseek,
 	.open       = efuse_burn_open,
 	.release    = efuse_burn_release,
 	.read       = efuse_burn_read,
 	.write      = efuse_burn_write,
 	.unlocked_ioctl      = efuse_burn_unlocked_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl   = efuse_burn_compat_ioctl,
 #endif
 };

 static ssize_t version_show(struct class *cla,
 			     struct class_attribute *attr, char *buf)
 {
 	ssize_t n = 0;

 	n = sprintf(buf, "ver1.0");
 	return n;
 }

 static ssize_t version_store(struct class *cla,
 			      struct class_attribute *attr,
 			      const char *buf, size_t count)
 {
 	pr_notice("%s:%d,buf=0x%lx,count=%zu\n",
 		__func__, __LINE__, (long)buf, count);
 	return count;
 }

 static EFUSE_CLASS_ATTR(version);

 static struct attribute *efuse_burn_class_attrs[] = {
 	&class_attr_version.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(efuse_burn_class);

 static int efuse_burn_probe(struct platform_device *pdev)
 {
 	int ret;
 	struct device *devp;
 	struct aml_efuse_burn_dev *efuse_burn_dev;
 	struct device_node *np = pdev->dev.of_node;

 	efuse_burn_dev = devm_kzalloc(&pdev->dev, sizeof(*efuse_burn_dev),
 						GFP_KERNEL);
 	if (!efuse_burn_dev) {
 		ret = -ENOMEM;
 		dev_err(&pdev->dev, "failed to alloc enough mem for efuse_dev\n");
 		goto out;
 	}

 	efuse_burn_dev->pdev = pdev;
 	platform_set_drvdata(pdev, efuse_burn_dev);

 	of_node_get(np);

 	ret = of_property_read_u32(np, "efuse_pattern_size",
 				   &efuse_burn_dev->efuse_pattern_size);
 	if (ret) {
 		pr_err("can't get efuse_pattern_size, please configurate size\n");
 		goto error1;
 	}

 	ret = alloc_chrdev_region(&efuse_burn_dev->devno, 0, 1,
 			EFUSE_BURN_DEVICE_NAME);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "fail to allocate major number\n ");
 		goto error1;
 	}

 	efuse_burn_dev->cls.name = EFUSE_BURN_CLASS_NAME;
 	efuse_burn_dev->cls.owner = THIS_MODULE;
 	efuse_burn_dev->cls.class_groups = efuse_burn_class_groups;
 	ret = class_register(&efuse_burn_dev->cls);
 	if (ret)
 		goto error2;

 	cdev_init(&efuse_burn_dev->cdev, &efuse_burn_fops);
 	efuse_burn_dev->cdev.owner = THIS_MODULE;

 	ret = cdev_add(&efuse_burn_dev->cdev, efuse_burn_dev->devno, 1);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to add device\n");
 		goto error3;
 	}

 	devp = device_create(&efuse_burn_dev->cls, NULL,
 			 efuse_burn_dev->devno, efuse_burn_dev, "efuse_burn");
 	if (IS_ERR(devp)) {
 		dev_err(&pdev->dev, "failed to create device node\n");
 		ret = PTR_ERR(devp);
 		goto error4;
 	}
 	pefuse_burn_dev = efuse_burn_dev;

 	dev_info(&pdev->dev, "device %s created OK\n", EFUSE_BURN_DEVICE_NAME);

 	return 0;

 error4:
 	cdev_del(&efuse_burn_dev->cdev);
 error3:
 	class_unregister(&efuse_burn_dev->cls);
 error2:
 	unregister_chrdev_region(efuse_burn_dev->devno, 1);
 error1:
 	devm_kfree(&pdev->dev, efuse_burn_dev);
 out:
 	return ret;
 }

 static int efuse_burn_remove(struct platform_device *pdev)
 {
 	struct aml_efuse_burn_dev *efuse_burn_dev;

 	efuse_burn_dev = platform_get_drvdata(pdev);
 	unregister_chrdev_region(efuse_burn_dev->devno, 1);
 	device_destroy(&efuse_burn_dev->cls, efuse_burn_dev->devno);
 	cdev_del(&efuse_burn_dev->cdev);
 	class_unregister(&efuse_burn_dev->cls);
 	platform_set_drvdata(pdev, NULL);
 	devm_kfree(&pdev->dev, efuse_burn_dev);
 	return 0;
 }

 static const struct of_device_id efuse_burn_dt_match[] = {
 	{	.compatible = "amlogic, efuseburn",
 	},
 	{},
 };

 static struct platform_driver efuse_burn_driver = {
 	.probe = efuse_burn_probe,
 	.remove = efuse_burn_remove,
 	.driver = {
 		.name = EFUSE_BURN_DEVICE_NAME,
 		.of_match_table = efuse_burn_dt_match,
 	.owner = THIS_MODULE,
 	},
 };

 int __init aml_efuse_burn_init(void)
 {
 	return platform_driver_register(&efuse_burn_driver);
 }

 void aml_efuse_burn_exit(void)
 {
 	platform_driver_unregister(&efuse_burn_driver);
 }
	// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
	/*
	* Copyright (c) 2019 Amlogic, Inc. All rights reserved.
	*/

	#include <linux/cdev.h>
	#include <linux/types.h>
	#include <linux/fs.h>
	#include <linux/device.h>
	#include <linux/slab.h>
	#include <linux/uaccess.h>
	#include <linux/platform_device.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/clk.h>
	#include "efuse.h"
	#include <linux/amlogic/efuse.h>
	#include <linux/io.h>
	#include <linux/compat.h>
	#include "efuse_burn.h"

	#define EFUSE_BURN_DEVICE_NAME "efuse_burn"
	#define EFUSE_BURN_CLASS_NAME "efuse_burn"

	static struct aml_efuse_burn_dev *pefuse_burn_dev;

	static int efuse_burn_open(struct inode inode, struct file file)
	{
	struct aml_efuse_burn_dev *devp;

	devp = container_of(inode->i_cdev, struct aml_efuse_burn_dev, cdev);
	file->private_data = devp;

	//printk(KERN_NOTICE "%s:%d\n", __func__, __LINE__);
	pr_notice("%s:%d\n", __func__, __LINE__);

	return 0;
	}

	static int efuse_burn_release(struct inode inode, struct file file)
	{
	file->private_data = NULL;
	return 0;
	}

	static loff_t efuse_burn_llseek(struct file *filp, loff_t off, int whence)
	{
	return 0;
	}

	static long efuse_burn_unlocked_ioctl(struct file *file,
	unsigned int cmd, unsigned long arg)
	{
	long ret = -ENOTTY;
	void __user argp = (void __user )arg;
	struct efuse_burn_info info;

	pr_notice("%s:%d\n", __func__, __LINE__);
	switch (cmd) {
	case EFUSE_BURN_CHECK_KEY:
	if (copy_from_user((void *)&info, argp, sizeof(info))) {
	pr_err("%s: copy_from_user fail\n", __func__);
	return -EFAULT;
	}
	if (efuse_burn_lockable_is_cfg(info.itemname) == 0) {
	info.status = efuse_burn_check_burned(info.itemname);
	} else {
	pr_err("%s: efuse_burn check item not cfg\n", __func__);
	return -EFAULT;
	}
	if (copy_to_user(argp, &info, sizeof(info))) {
	pr_err("%s: copy_to_user fail\n", __func__);
	return -EFAULT;
	}
	break;
	}

	return ret;
	}

	#ifdef CONFIG_COMPAT
	static long efuse_burn_compat_ioctl(struct file *filp,
	unsigned int cmd, unsigned long args)
	{
	long ret;

	args = (unsigned long)compat_ptr(args);
	ret = efuse_burn_unlocked_ioctl(filp, cmd, args);

	return ret;
	}
	#endif

	static ssize_t efuse_burn_read(struct file file, char __user buf,
	size_t count, loff_t *ppos)
	{
	pr_notice("%s:%d\n", __func__, __LINE__);
	return 0;
	}

	static ssize_t efuse_burn_write(struct file *file,
	const char __user buf, size_t count, loff_t ppos)
	{
	struct aml_efuse_burn_dev *devp;
	ssize_t ret;
	char *op = NULL;

	devp = file->private_data;
	//pr_notice("%s:%d, sizeof(loff_t):%d\n",
	// __func__, __LINE__, sizeof(loff_t));
	//pr_notice("pos=%lld,count=%d\n", *ppos, count);
	if (count != devp->efuse_pattern_size) {
	ret = -EINVAL;
	pr_err("efuse burn: bad pattern size, only support size %d!\n",
	devp->efuse_pattern_size);
	goto exit;
	}
	op = kzalloc(sizeof(char) * count, GFP_KERNEL);
	if (!op) {
	ret = -ENOMEM;
	pr_err("efuse burn: failed to allocate memory!\n");
	goto exit;
	}

	memset(op, 0, count);
	if (copy_from_user(op, buf, count)) {
	pr_err("%s: copy_from_user fail\n", __func__);
	kfree(op);
	ret = -EFAULT;
	goto exit;
	}

	ret = efuse_amlogic_set(op, count);
	kfree(op);

	if (ret) {
	pr_err("efuse burn: pattern programming fail! ret: %d\n",
	(unsigned int)ret);
	ret = -EINVAL;
	goto exit;
	}

	pr_info("efuse burn: pattern programming success!\n");

	ret = count;

	exit:
	return ret;
	}

	static const struct file_operations efuse_burn_fops = {
	.owner = THIS_MODULE,
	.llseek = efuse_burn_llseek,
	.open = efuse_burn_open,
	.release = efuse_burn_release,
	.read = efuse_burn_read,
	.write = efuse_burn_write,
	.unlocked_ioctl = efuse_burn_unlocked_ioctl,
	#ifdef CONFIG_COMPAT
	.compat_ioctl = efuse_burn_compat_ioctl,
	#endif
	};

	static ssize_t version_show(struct class *cla,
	struct class_attribute attr, char buf)
	{
	ssize_t n = 0;

	n = sprintf(buf, "ver1.0");
	return n;
	}

	static ssize_t version_store(struct class *cla,
	struct class_attribute *attr,
	const char *buf, size_t count)
	{
	pr_notice("%s:%d,buf=0x%lx,count=%zu\n",
	__func__, __LINE__, (long)buf, count);
	return count;
	}

	static EFUSE_CLASS_ATTR(version);

	static struct attribute *efuse_burn_class_attrs[] = {
	&class_attr_version.attr,
	NULL,
	};
	ATTRIBUTE_GROUPS(efuse_burn_class);

	static int efuse_burn_probe(struct platform_device *pdev)
	{
	int ret;
	struct device *devp;
	struct aml_efuse_burn_dev *efuse_burn_dev;
	struct device_node *np = pdev->dev.of_node;

	efuse_burn_dev = devm_kzalloc(&pdev->dev, sizeof(*efuse_burn_dev),
	GFP_KERNEL);
	if (!efuse_burn_dev) {
	ret = -ENOMEM;
	dev_err(&pdev->dev, "failed to alloc enough mem for efuse_dev\n");
	goto out;
	}

	efuse_burn_dev->pdev = pdev;
	platform_set_drvdata(pdev, efuse_burn_dev);

	of_node_get(np);

	ret = of_property_read_u32(np, "efuse_pattern_size",
	&efuse_burn_dev->efuse_pattern_size);
	if (ret) {
	pr_err("can't get efuse_pattern_size, please configurate size\n");
	goto error1;
	}

	ret = alloc_chrdev_region(&efuse_burn_dev->devno, 0, 1,
	EFUSE_BURN_DEVICE_NAME);
	if (ret < 0) {
	dev_err(&pdev->dev, "fail to allocate major number\n ");
	goto error1;
	}

	efuse_burn_dev->cls.name = EFUSE_BURN_CLASS_NAME;
	efuse_burn_dev->cls.owner = THIS_MODULE;
	efuse_burn_dev->cls.class_groups = efuse_burn_class_groups;
	ret = class_register(&efuse_burn_dev->cls);
	if (ret)
	goto error2;

	cdev_init(&efuse_burn_dev->cdev, &efuse_burn_fops);
	efuse_burn_dev->cdev.owner = THIS_MODULE;

	ret = cdev_add(&efuse_burn_dev->cdev, efuse_burn_dev->devno, 1);
	if (ret) {
	dev_err(&pdev->dev, "failed to add device\n");
	goto error3;
	}

	devp = device_create(&efuse_burn_dev->cls, NULL,
	efuse_burn_dev->devno, efuse_burn_dev, "efuse_burn");
	if (IS_ERR(devp)) {
	dev_err(&pdev->dev, "failed to create device node\n");
	ret = PTR_ERR(devp);
	goto error4;
	}
	pefuse_burn_dev = efuse_burn_dev;

	dev_info(&pdev->dev, "device %s created OK\n", EFUSE_BURN_DEVICE_NAME);

	return 0;

	error4:
	cdev_del(&efuse_burn_dev->cdev);
	error3:
	class_unregister(&efuse_burn_dev->cls);
	error2:
	unregister_chrdev_region(efuse_burn_dev->devno, 1);
	error1:
	devm_kfree(&pdev->dev, efuse_burn_dev);
	out:
	return ret;
	}

	static int efuse_burn_remove(struct platform_device *pdev)
	{
	struct aml_efuse_burn_dev *efuse_burn_dev;

	efuse_burn_dev = platform_get_drvdata(pdev);
	unregister_chrdev_region(efuse_burn_dev->devno, 1);
	device_destroy(&efuse_burn_dev->cls, efuse_burn_dev->devno);
	cdev_del(&efuse_burn_dev->cdev);
	class_unregister(&efuse_burn_dev->cls);
	platform_set_drvdata(pdev, NULL);
	devm_kfree(&pdev->dev, efuse_burn_dev);
	return 0;
	}

	static const struct of_device_id efuse_burn_dt_match[] = {
	{ .compatible = "amlogic, efuseburn",
	},
	{},
	};

	static struct platform_driver efuse_burn_driver = {
	.probe = efuse_burn_probe,
	.remove = efuse_burn_remove,
	.driver = {
	.name = EFUSE_BURN_DEVICE_NAME,
	.of_match_table = efuse_burn_dt_match,
	.owner = THIS_MODULE,
	},
	};

	int __init aml_efuse_burn_init(void)
	{
	return platform_driver_register(&efuse_burn_driver);
	}

	void aml_efuse_burn_exit(void)
	{
	platform_driver_unregister(&efuse_burn_driver);
	}