CTC++ Coverage Report

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			1	/*
			2	* file.c - part of debugfs, a tiny little debug file system
			3	*
			4	* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
			5	* Copyright (C) 2004 IBM Inc.
			6	*
			7	* This program is free software; you can redistribute it and/or
			8	* modify it under the terms of the GNU General Public License version
			9	* 2 as published by the Free Software Foundation.
			10	*
			11	* debugfs is for people to use instead of /proc or /sys.
			12	* See Documentation/DocBook/kernel-api for more details.
			13	*
			14	*/
			15
			16	#include <linux/config.h>
			17	#include <linux/module.h>
			18	#include <linux/fs.h>
			19	#include <linux/pagemap.h>
			20	#include <linux/debugfs.h>
			21

0	0	-	22	static ssize_t default_read_file(struct file file, char __user buf,
			23	size_t count, loff_t *ppos)
			24	{
0		-	25	return 0;
			26	}
			27

0	0	-	28	static ssize_t default_write_file(struct file file, const char __user buf,
			29	size_t count, loff_t *ppos)
			30	{
0		-	31	return count;
			32	}
			33

0	0	-	34	static int default_open(struct inode inode, struct file file)
			35	{
0	0	-	36	if (inode->u.generic_ip)
			37	file->private_data = inode->u.generic_ip;
			38
0		-	39	return 0;
			40	}
			41
			42	struct file_operations debugfs_file_operations = {
			43	.read = default_read_file,
			44	.write = default_write_file,
			45	.open = default_open,
			46	};
			47

0	0	-	48	static void debugfs_u8_set(void *data, u64 val)
			49	{
			50	(u8 )data = val;
			51	}

0	0	-	52	static u64 debugfs_u8_get(void *data)
			53	{
0		-	54	return (u8 )data;
			55	}

0	0	-	56	DEFINE_SIMPLE_ATTRIBUTE(fops_u8, debugfs_u8_get, debugfs_u8_set, "%llu\n");
0		-	56	return simple_attr_open ( inode , file , debug..
			57
			58	/**
			59	* debugfs_create_u8 - create a file in the debugfs filesystem that is used to read and write an unsigned 8 bit value.
			60	*
			61	* @name: a pointer to a string containing the name of the file to create.
			62	* @mode: the permission that the file should have
			63	* @parent: a pointer to the parent dentry for this file. This should be a
			64	* directory dentry if set. If this paramater is NULL, then the
			65	* file will be created in the root of the debugfs filesystem.
			66	* @value: a pointer to the variable that the file should read to and write
			67	* from.
			68	*
			69	* This function creates a file in debugfs with the given name that
			70	* contains the value of the variable @value. If the @mode variable is so
			71	* set, it can be read from, and written to.
			72	*
			73	* This function will return a pointer to a dentry if it succeeds. This
			74	* pointer must be passed to the debugfs_remove() function when the file is
			75	* to be removed (no automatic cleanup happens if your module is unloaded,
			76	* you are responsible here.) If an error occurs, NULL will be returned.
			77	*
			78	* If debugfs is not enabled in the kernel, the value -ENODEV will be
			79	* returned. It is not wise to check for this value, but rather, check for
			80	* NULL or !NULL instead as to eliminate the need for #ifdef in the calling
			81	* code.
			82	*/

0	0	-	83	struct dentry debugfs_create_u8(const char name, mode_t mode,
			84	struct dentry parent, u8 value)
			85	{
0		-	86	return debugfs_create_file(name, mode, parent, value, &fops_u8);
			87	}
			88	EXPORT_SYMBOL_GPL(debugfs_create_u8);
			89

0	0	-	90	static void debugfs_u16_set(void *data, u64 val)
			91	{
			92	(u16 )data = val;
			93	}

0	0	-	94	static u64 debugfs_u16_get(void *data)
			95	{
0		-	96	return (u16 )data;
			97	}

0	0	-	98	DEFINE_SIMPLE_ATTRIBUTE(fops_u16, debugfs_u16_get, debugfs_u16_set, "%llu\n");
0		-	98	return simple_attr_open ( inode , file , debug..
			99
			100	/**
			101	* debugfs_create_u16 - create a file in the debugfs filesystem that is used to read and write an unsigned 16 bit value.
			102	*
			103	* @name: a pointer to a string containing the name of the file to create.
			104	* @mode: the permission that the file should have
			105	* @parent: a pointer to the parent dentry for this file. This should be a
			106	* directory dentry if set. If this paramater is NULL, then the
			107	* file will be created in the root of the debugfs filesystem.
			108	* @value: a pointer to the variable that the file should read to and write
			109	* from.
			110	*
			111	* This function creates a file in debugfs with the given name that
			112	* contains the value of the variable @value. If the @mode variable is so
			113	* set, it can be read from, and written to.
			114	*
			115	* This function will return a pointer to a dentry if it succeeds. This
			116	* pointer must be passed to the debugfs_remove() function when the file is
			117	* to be removed (no automatic cleanup happens if your module is unloaded,
			118	* you are responsible here.) If an error occurs, NULL will be returned.
			119	*
			120	* If debugfs is not enabled in the kernel, the value -ENODEV will be
			121	* returned. It is not wise to check for this value, but rather, check for
			122	* NULL or !NULL instead as to eliminate the need for #ifdef in the calling
			123	* code.
			124	*/

0	0	-	125	struct dentry debugfs_create_u16(const char name, mode_t mode,
			126	struct dentry parent, u16 value)
			127	{
0		-	128	return debugfs_create_file(name, mode, parent, value, &fops_u16);
			129	}
			130	EXPORT_SYMBOL_GPL(debugfs_create_u16);
			131

0	0	-	132	static void debugfs_u32_set(void *data, u64 val)
			133	{
			134	(u32 )data = val;
			135	}

0	0	-	136	static u64 debugfs_u32_get(void *data)
			137	{
0		-	138	return (u32 )data;
			139	}

0	0	-	140	DEFINE_SIMPLE_ATTRIBUTE(fops_u32, debugfs_u32_get, debugfs_u32_set, "%llu\n");
0		-	140	return simple_attr_open ( inode , file , debug..
			141
			142	/**
			143	* debugfs_create_u32 - create a file in the debugfs filesystem that is used to read and write an unsigned 32 bit value.
			144	*
			145	* @name: a pointer to a string containing the name of the file to create.
			146	* @mode: the permission that the file should have
			147	* @parent: a pointer to the parent dentry for this file. This should be a
			148	* directory dentry if set. If this paramater is NULL, then the
			149	* file will be created in the root of the debugfs filesystem.
			150	* @value: a pointer to the variable that the file should read to and write
			151	* from.
			152	*
			153	* This function creates a file in debugfs with the given name that
			154	* contains the value of the variable @value. If the @mode variable is so
			155	* set, it can be read from, and written to.
			156	*
			157	* This function will return a pointer to a dentry if it succeeds. This
			158	* pointer must be passed to the debugfs_remove() function when the file is
			159	* to be removed (no automatic cleanup happens if your module is unloaded,
			160	* you are responsible here.) If an error occurs, NULL will be returned.
			161	*
			162	* If debugfs is not enabled in the kernel, the value -ENODEV will be
			163	* returned. It is not wise to check for this value, but rather, check for
			164	* NULL or !NULL instead as to eliminate the need for #ifdef in the calling
			165	* code.
			166	*/

0	0	-	167	struct dentry debugfs_create_u32(const char name, mode_t mode,
			168	struct dentry parent, u32 value)
			169	{
0		-	170	return debugfs_create_file(name, mode, parent, value, &fops_u32);
			171	}
			172	EXPORT_SYMBOL_GPL(debugfs_create_u32);
			173

0	0	-	174	static ssize_t read_file_bool(struct file file, char __user user_buf,
			175	size_t count, loff_t *ppos)
			176	{
			177	char buf[3];
			178	u32 *val = file->private_data;
			179
0	0	-	180	if (*val)
			181	buf[0] = 'Y';
			182	else
			183	buf[0] = 'N';
			184	buf[1] = '\n';
			185	buf[2] = 0x00;
0		-	186	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
			187	}
			188

0	0	-	189	static ssize_t write_file_bool(struct file file, const char __user user_buf,
			190	size_t count, loff_t *ppos)
			191	{
			192	char buf[32];
			193	int buf_size;
			194	u32 *val = file->private_data;
			195
			196	buf_size = min(count, (sizeof(buf)-1));
0	0	-	197	if (copy_from_user(buf, user_buf, buf_size))
0		-	198	return -EFAULT;
			199
			200	switch (buf[0]) {
0		-	201	case 'y':
0		-	202	case 'Y':
0		-	203	case '1':
			204	*val = 1;
0		-	205	break;
0		-	206	case 'n':
0		-	207	case 'N':
0		-	208	case '0':
			209	*val = 0;
0		-	210	break;
			211	}
			212
0		-	213	return count;
			214	}
			215
			216	static struct file_operations fops_bool = {
			217	.read = read_file_bool,
			218	.write = write_file_bool,
			219	.open = default_open,
			220	};
			221
			222	/**
			223	* debugfs_create_bool - create a file in the debugfs filesystem that is used to read and write a boolean value.
			224	*
			225	* @name: a pointer to a string containing the name of the file to create.
			226	* @mode: the permission that the file should have
			227	* @parent: a pointer to the parent dentry for this file. This should be a
			228	* directory dentry if set. If this paramater is NULL, then the
			229	* file will be created in the root of the debugfs filesystem.
			230	* @value: a pointer to the variable that the file should read to and write
			231	* from.
			232	*
			233	* This function creates a file in debugfs with the given name that
			234	* contains the value of the variable @value. If the @mode variable is so
			235	* set, it can be read from, and written to.
			236	*
			237	* This function will return a pointer to a dentry if it succeeds. This
			238	* pointer must be passed to the debugfs_remove() function when the file is
			239	* to be removed (no automatic cleanup happens if your module is unloaded,
			240	* you are responsible here.) If an error occurs, NULL will be returned.
			241	*
			242	* If debugfs is not enabled in the kernel, the value -ENODEV will be
			243	* returned. It is not wise to check for this value, but rather, check for
			244	* NULL or !NULL instead as to eliminate the need for #ifdef in the calling
			245	* code.
			246	*/

0	0	-	247	struct dentry debugfs_create_bool(const char name, mode_t mode,
			248	struct dentry parent, u32 value)
			249	{
0		-	250	return debugfs_create_file(name, mode, parent, value, &fops_bool);
			251	}
			252	EXPORT_SYMBOL_GPL(debugfs_create_bool);
			253
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