shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-07 03:15:31 +09:00
Code Issues Packages Projects Releases Wiki Activity

fs: debugfs: add debugfs_create_u32_array_hex

Browse Source 
Change-Id: I87ccffbc7510e58dd3724b47bc7b759a3a588ca8
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
This commit is contained in:
Jianqun Xu
2019-11-14 17:59:49 +08:00
committed by Tao Huang
parent 625bdf8418
commit 8a0ad6ca56
2 changed files with 76 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

65
fs/debugfs/file.c
View File

@@ -965,6 +965,46 @@ static int u32_array_open(struct inode *inode, struct file *file)
return nonseekable_open(inode, file);
}
static size_t u32_format_array_hex(char *buf, size_t bufsize, u32 *array, int array_size)
{
int i = 0;
while (--array_size >= 0) {
size_t len;
char term = (array_size && (++i % 8)) ? ' ' : '\n';
len = snprintf(buf, bufsize, "%08X%c", *array++, term);
buf += len;
bufsize -= len;
}
return 0;
}
static int u32_array_open_hex(struct inode *inode, struct file *file)
{
struct array_data *data = inode->i_private;
int size, elements = data->elements;
char *buf;
/*
* Max size:
* - 8 digits + ' '/'\n' = 9 bytes per number
* - terminating NUL character
*/
size = elements * 9;
buf = kmalloc(size + 1, GFP_KERNEL);
if (!buf)
return -ENOMEM;
buf[size] = 0;
file->private_data = buf;
u32_format_array_hex(buf, size, data->array, data->elements);
return nonseekable_open(inode, file);
}
static ssize_t u32_array_read(struct file *file, char __user *buf, size_t len,
loff_t *ppos)
{
@@ -989,6 +1029,14 @@ static const struct file_operations u32_array_fops = {
.llseek = no_llseek,
};
static const struct file_operations u32_array_hex_fops = {
.owner = THIS_MODULE,
.open = u32_array_open_hex,
.release = u32_array_release,
.read = u32_array_read,
.llseek = no_llseek,
};
/**
* debugfs_create_u32_array - create a debugfs file that is used to read u32
* array.
@@ -1025,6 +1073,23 @@ struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
}
EXPORT_SYMBOL_GPL(debugfs_create_u32_array);
struct dentry *debugfs_create_u32_array_hex(const char *name, umode_t mode,
struct dentry *parent,
u32 *array, u32 elements)
{
struct array_data *data = kmalloc(sizeof(*data), GFP_KERNEL);
if (data == NULL)
return NULL;
data->array = array;
data->elements = elements;
return debugfs_create_file_unsafe(name, mode, parent, data,
&u32_array_hex_fops);
}
EXPORT_SYMBOL_GPL(debugfs_create_u32_array_hex);
#ifdef CONFIG_HAS_IOMEM
/*

11
include/linux/debugfs.h
View File

@@ -138,6 +138,10 @@ struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
struct dentry *parent,
u32 *array, u32 elements);
struct dentry *debugfs_create_u32_array_hex(const char *name, umode_t mode,
struct dentry *parent,
u32 *array, u32 elements);
struct dentry *debugfs_create_devm_seqfile(struct device *dev, const char *name,
struct dentry *parent,
int (*read_fn)(struct seq_file *s,
@@ -361,6 +365,13 @@ static inline struct dentry *debugfs_create_u32_array(const char *name, umode_t
return ERR_PTR(-ENODEV);
}
static inline struct dentry *debugfs_create_u32_array_hex(const char *name, umode_t mode,
struct dentry *parent,
u32 *array, u32 elements)
{
return ERR_PTR(-ENODEV);
}
static inline struct dentry *debugfs_create_devm_seqfile(struct device *dev,
const char *name,
struct dentry *parent,