add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/mfd/aat2870-core.c
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@@ -1,26 +1,12 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * linux/drivers/mfd/aat2870-core.c
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  *
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  * Copyright (c) 2011, NVIDIA Corporation.
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  * Author: Jin Park <jinyoungp@nvidia.com>
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * 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, but
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- * WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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- * General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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- * 02110-1301 USA
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  */
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 #include <linux/kernel.h>
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-#include <linux/module.h>
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 #include <linux/init.h>
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 #include <linux/debugfs.h>
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 #include <linux/slab.h>
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@@ -235,7 +221,7 @@
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 	count += sprintf(buf, "aat2870 registers\n");
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 	for (addr = 0; addr < AAT2870_REG_NUM; addr++) {
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-		count += sprintf(buf + count, "0x%02x: ", addr);
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+		count += snprintf(buf + count, PAGE_SIZE - count, "0x%02x: ", addr);
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 		if (count >= PAGE_SIZE - 1)
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 			break;
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@@ -335,30 +321,13 @@
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 static void aat2870_init_debugfs(struct aat2870_data *aat2870)
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 {
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 	aat2870->dentry_root = debugfs_create_dir("aat2870", NULL);
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-	if (!aat2870->dentry_root) {
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-		dev_warn(aat2870->dev,
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-			 "Failed to create debugfs root directory\n");
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-		return;
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-	}
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-	aat2870->dentry_reg = debugfs_create_file("regs", 0644,
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-						  aat2870->dentry_root,
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-						  aat2870, &aat2870_reg_fops);
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-	if (!aat2870->dentry_reg)
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-		dev_warn(aat2870->dev,
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-			 "Failed to create debugfs register file\n");
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+	debugfs_create_file("regs", 0644, aat2870->dentry_root, aat2870,
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+			    &aat2870_reg_fops);
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 }
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-static void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
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-{
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-	debugfs_remove_recursive(aat2870->dentry_root);
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-}
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 #else
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 static inline void aat2870_init_debugfs(struct aat2870_data *aat2870)
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-{
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-}
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-
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-static inline void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
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 {
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 }
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 #endif /* CONFIG_DEBUG_FS */
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@@ -440,20 +409,6 @@
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 	return ret;
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 }
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-static int aat2870_i2c_remove(struct i2c_client *client)
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-{
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-	struct aat2870_data *aat2870 = i2c_get_clientdata(client);
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-
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-	aat2870_uninit_debugfs(aat2870);
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-
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-	mfd_remove_devices(aat2870->dev);
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-	aat2870_disable(aat2870);
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-	if (aat2870->uninit)
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-		aat2870->uninit(aat2870);
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-
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-	return 0;
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-}
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-
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 #ifdef CONFIG_PM_SLEEP
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 static int aat2870_i2c_suspend(struct device *dev)
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 {
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@@ -492,15 +447,14 @@
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 	{ "aat2870", 0 },
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 	{ }
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 };
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-MODULE_DEVICE_TABLE(i2c, aat2870_i2c_id_table);
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 static struct i2c_driver aat2870_i2c_driver = {
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 	.driver = {
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-		.name	= "aat2870",
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-		.pm	= &aat2870_pm_ops,
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+		.name			= "aat2870",
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+		.pm			= &aat2870_pm_ops,
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+		.suppress_bind_attrs	= true,
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 	},
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 	.probe		= aat2870_i2c_probe,
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-	.remove		= aat2870_i2c_remove,
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 	.id_table	= aat2870_i2c_id_table,
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 };
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@@ -509,13 +463,3 @@
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 	return i2c_add_driver(&aat2870_i2c_driver);
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 }
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 subsys_initcall(aat2870_init);
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-
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-static void __exit aat2870_exit(void)
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-{
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-	i2c_del_driver(&aat2870_i2c_driver);
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-}
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-module_exit(aat2870_exit);
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-
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-MODULE_DESCRIPTION("Core support for the AnalogicTech AAT2870");
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-MODULE_LICENSE("GPL");
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-MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");