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author | Greg Kroah-Hartman <gregkh@suse.de> | 2006-03-10 15:38:47 -0800 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-03-10 15:38:47 -0800 |
commit | 1b558141db8b06c61edebaaf5e3394ed98540ac7 (patch) | |
tree | 2f54608989ab6b2af3e6c1f74f956090485baf63 /driver | |
parent | 65d0e6259152a94a0bf4c43c860b45826a3d11f9 (diff) | |
download | patches-1b558141db8b06c61edebaaf5e3394ed98540ac7.tar.gz |
i2c and pci patches added
Diffstat (limited to 'driver')
-rw-r--r-- | driver/debugfs-add-debugfs_create_blob-helper-for-exporting-binary-data.patch | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/driver/debugfs-add-debugfs_create_blob-helper-for-exporting-binary-data.patch b/driver/debugfs-add-debugfs_create_blob-helper-for-exporting-binary-data.patch new file mode 100644 index 0000000000000..ccd88b9b74e75 --- /dev/null +++ b/driver/debugfs-add-debugfs_create_blob-helper-for-exporting-binary-data.patch @@ -0,0 +1,108 @@ +From michael@ozlabs.org Tue Mar 7 02:42:37 2006 +To: Greg Kroah-Hartman <greg@kroah.com> +From: Michael Ellerman <michael@ellerman.id.au> +Date: Tue, 07 Mar 2006 21:41:59 +1100 +Subject: debugfs: Add debugfs_create_blob() helper for exporting binary data +Message-Id: <20060307104225.E0DDA679E6@ozlabs.org> + +I wanted to export a binary blob via debugfs, and although it was pretty easy +it seems like it'd be easier if there was a helper for it. It's a pity we need +the wrapper struct but I can't see a cleaner way to do it. + +Signed-off-by: Michael Ellerman <michael@ellerman.id.au> +Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> +--- + fs/debugfs/file.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ + include/linux/debugfs.h | 15 +++++++++++++++ + 2 files changed, 61 insertions(+) + +--- gregkh-2.6.orig/fs/debugfs/file.c ++++ gregkh-2.6/fs/debugfs/file.c +@@ -251,3 +251,49 @@ struct dentry *debugfs_create_bool(const + } + EXPORT_SYMBOL_GPL(debugfs_create_bool); + ++static ssize_t read_file_blob(struct file *file, char __user *user_buf, ++ size_t count, loff_t *ppos) ++{ ++ struct debugfs_blob_wrapper *blob = file->private_data; ++ return simple_read_from_buffer(user_buf, count, ppos, blob->data, ++ blob->size); ++} ++ ++static struct file_operations fops_blob = { ++ .read = read_file_blob, ++ .open = default_open, ++}; ++ ++/** ++ * debugfs_create_blob - create a file in the debugfs filesystem that is ++ * used to read and write a binary blob. ++ * ++ * @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 paramater is NULL, then the ++ * file will be created in the root of the debugfs filesystem. ++ * @blob: a pointer to a struct debugfs_blob_wrapper which contains a pointer ++ * to the blob data and the size of the data. ++ * ++ * This function creates a file in debugfs with the given name that exports ++ * @blob->data as a binary blob. If the @mode variable is so set it can be ++ * read from. Writing is not supported. ++ * ++ * 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_blob(const char *name, mode_t mode, ++ struct dentry *parent, ++ struct debugfs_blob_wrapper *blob) ++{ ++ return debugfs_create_file(name, mode, parent, blob, &fops_blob); ++} ++EXPORT_SYMBOL_GPL(debugfs_create_blob); +--- gregkh-2.6.orig/include/linux/debugfs.h ++++ gregkh-2.6/include/linux/debugfs.h +@@ -21,6 +21,11 @@ + + struct file_operations; + ++struct debugfs_blob_wrapper { ++ void *data; ++ unsigned long size; ++}; ++ + #if defined(CONFIG_DEBUG_FS) + struct dentry *debugfs_create_file(const char *name, mode_t mode, + struct dentry *parent, void *data, +@@ -39,6 +44,9 @@ struct dentry *debugfs_create_u32(const + struct dentry *debugfs_create_bool(const char *name, mode_t mode, + struct dentry *parent, u32 *value); + ++struct dentry *debugfs_create_blob(const char *name, mode_t mode, ++ struct dentry *parent, ++ struct debugfs_blob_wrapper *blob); + #else + + #include <linux/err.h> +@@ -94,6 +102,13 @@ static inline struct dentry *debugfs_cre + return ERR_PTR(-ENODEV); + } + ++static inline struct dentry *debugfs_create_blob(const char *name, mode_t mode, ++ struct dentry *parent, ++ struct debugfs_blob_wrapper *blob) ++{ ++ return ERR_PTR(-ENODEV); ++} ++ + #endif + + #endif |