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Commit c23fe831 authored by Viresh Kumar's avatar Viresh Kumar Committed by Greg Kroah-Hartman
Browse files

debugfs: Add debugfs_create_ulong() 



Add debugfs_create_ulong() for the users of type 'unsigned long'. These
will be 32 bits long on a 32 bit machine and 64 bits long on a 64 bit
machine.

Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 56f2de81

fs/debugfs/file.c

+48 −0
Original line number Diff line number Diff line
@@ -243,6 +243,54 @@ struct dentry *debugfs_create_u64(const char *name, umode_t mode, 
}

EXPORT_SYMBOL_GPL(debugfs_create_u64);



static int debugfs_ulong_set(void *data, u64 val)

{

	*(unsigned long *)data = val;

	return 0;

}



static int debugfs_ulong_get(void *data, u64 *val)

{

	*val = *(unsigned long *)data;

	return 0;

}

DEFINE_SIMPLE_ATTRIBUTE(fops_ulong, debugfs_ulong_get, debugfs_ulong_set, "%llu\n");

DEFINE_SIMPLE_ATTRIBUTE(fops_ulong_ro, debugfs_ulong_get, NULL, "%llu\n");

DEFINE_SIMPLE_ATTRIBUTE(fops_ulong_wo, NULL, debugfs_ulong_set, "%llu\n");



/**

 * debugfs_create_ulong - create a debugfs file that is used to read and write

 * an unsigned long value.

 * @name: a pointer to a string containing the name of the file to create.

 * @mode: the permission that the file should have

 * @parent: a pointer to the parent dentry for this file.  This should be a

 *          directory dentry if set.  If this parameter is %NULL, then the

 *          file will be created in the root of the debugfs filesystem.

 * @value: a pointer to the variable that the file should read to and write

 *         from.

 *

 * This function creates a file in debugfs with the given name that

 * contains the value of the variable @value.  If the @mode variable is so

 * set, it can be read from, and written to.

 *

 * This function will return a pointer to a dentry if it succeeds.  This

 * pointer must be passed to the debugfs_remove() function when the file is

 * to be removed (no automatic cleanup happens if your module is unloaded,

 * you are responsible here.)  If an error occurs, %NULL will be returned.

 *

 * If debugfs is not enabled in the kernel, the value -%ENODEV will be

 * returned.  It is not wise to check for this value, but rather, check for

 * %NULL or !%NULL instead as to eliminate the need for #ifdef in the calling

 * code.

 */

struct dentry *debugfs_create_ulong(const char *name, umode_t mode,

				    struct dentry *parent, unsigned long *value)

{

	return debugfs_create_mode(name, mode, parent, value, &fops_ulong,

				   &fops_ulong_ro, &fops_ulong_wo);

}

EXPORT_SYMBOL_GPL(debugfs_create_ulong);



DEFINE_SIMPLE_ATTRIBUTE(fops_x8, debugfs_u8_get, debugfs_u8_set, "0x%02llx\n");

DEFINE_SIMPLE_ATTRIBUTE(fops_x8_ro, debugfs_u8_get, NULL, "0x%02llx\n");

DEFINE_SIMPLE_ATTRIBUTE(fops_x8_wo, NULL, debugfs_u8_set, "0x%02llx\n");

include/linux/debugfs.h

+2 −0
Original line number Diff line number Diff line
@@ -79,6 +79,8 @@ struct dentry *debugfs_create_u32(const char *name, umode_t mode, 
				  struct dentry *parent, u32 *value);

struct dentry *debugfs_create_u64(const char *name, umode_t mode,

				  struct dentry *parent, u64 *value);

struct dentry *debugfs_create_ulong(const char *name, umode_t mode,

				    struct dentry *parent, unsigned long *value);

struct dentry *debugfs_create_x8(const char *name, umode_t mode,

				 struct dentry *parent, u8 *value);

struct dentry *debugfs_create_x16(const char *name, umode_t mode,