2 files changed, 69 insertions, 1 deletions

diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 76c08c2beb2f..a2f8ec70fe8d 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -22,6 +22,7 @@
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/atomic.h>
+#include <linux/device.h>
 
 static ssize_t default_read_file(struct file *file, char __user *buf,
                                  size_t count, loff_t *ppos)
@@ -761,3 +762,56 @@ struct dentry *debugfs_create_regset32(const char *name, umode_t mode,
 EXPORT_SYMBOL_GPL(debugfs_create_regset32);
 
 #endif /* CONFIG_HAS_IOMEM */
+
+struct debugfs_devm_entry {
+        int (*read)(struct seq_file *seq, void *data);
+        struct device *dev;
+};
+
+static int debugfs_devm_entry_open(struct inode *inode, struct file *f)
+{
+        struct debugfs_devm_entry *entry = inode->i_private;
+
+        return single_open(f, entry->read, entry->dev);
+}
+
+static const struct file_operations debugfs_devm_entry_ops = {
+        .owner = THIS_MODULE,
+        .open = debugfs_devm_entry_open,
+        .release = single_release,
+        .read = seq_read,
+        .llseek = seq_lseek
+};
+
+/**
+ * debugfs_create_devm_seqfile - create a debugfs file that is bound to device.
+ *
+ * @dev: device related to this debugfs file.
+ * @name: name of the debugfs file.
+ * @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.
+ * @read_fn: function pointer called to print the seq_file content.
+ */
+struct dentry *debugfs_create_devm_seqfile(struct device *dev, const char *name,
+                                           struct dentry *parent,
+                                           int (*read_fn)(struct seq_file *s,
+                                                          void *data))
+{
+        struct debugfs_devm_entry *entry;
+
+        if (IS_ERR(parent))
+                return ERR_PTR(-ENOENT);
+
+        entry = devm_kzalloc(dev, sizeof(*entry), GFP_KERNEL);
+        if (!entry)
+                return ERR_PTR(-ENOMEM);
+
+        entry->read = read_fn;
+        entry->dev = dev;
+
+        return debugfs_create_file(name, S_IRUGO, parent, entry,
+                                   &debugfs_devm_entry_ops);
+}
+EXPORT_SYMBOL_GPL(debugfs_create_devm_seqfile);
+
diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
index 4d0b4d1aa132..4bbe2ace972a 100644
--- a/include/linux/debugfs.h
+++ b/include/linux/debugfs.h
@@ -99,13 +99,18 @@ struct dentry *debugfs_create_u32_array(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,
+                                                          void *data));
+
 bool debugfs_initialized(void);
 
 #else
 
 #include <linux/err.h>
 
-/* 
+/*
  * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
  * so users have a chance to detect if there was a real error or not.  We don't
  * want to duplicate the design decision mistakes of procfs and devfs again.
@@ -251,6 +256,15 @@ static inline struct dentry *debugfs_create_u32_array(const char *name, umode_t
         return ERR_PTR(-ENODEV);
 }
 
+static inline struct dentry *debugfs_create_devm_seqfile(struct device *dev,
+                                                         const char *name,
+                                                         struct dentry *parent,
+                                           int (*read_fn)(struct seq_file *s,
+                                                          void *data))
+{
+        return ERR_PTR(-ENODEV);
+}
+
 #endif
 
 #endif