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authorArend van Spriel <arend@broadcom.com>2014-11-09 11:31:58 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-11-26 19:38:37 -0800
commit98210b7f73f1db182bd9a558a031093cd166e907 (patch)
tree93b0c862e237d963e9ad9a8d2ff8e5b0e222b8fd /include/linux/debugfs.h
parent6df43c9b4d87b6767debdfa8318c5374415e8fc0 (diff)
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debugfs: add helper function to create device related seq_file
This patch adds a helper function that simplifies adding a so-called single_open sequence file for device drivers. The calling device driver needs to provide a read function and a device pointer. The field struct seq_file::private will reference the device pointer upon call to the read function so the driver can obtain his data from it and do its task of providing the file content using seq_printf() calls and alike. Using this helper function also gets rid of the need to specify file operations per debugfs file. Signed-off-by: Arend van Spriel <arend@broadcom.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/debugfs.h')
-rw-r--r--include/linux/debugfs.h16
1 files changed, 15 insertions, 1 deletions
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