debugfs.h 3.2 KB

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  1. /*
  2. * debugfs.h - a tiny little debug file system
  3. *
  4. * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
  5. * Copyright (C) 2004 IBM Inc.
  6. *
  7. * This program is free software; you can redistribute it and/or
  8. * modify it under the terms of the GNU General Public License version
  9. * 2 as published by the Free Software Foundation.
  10. *
  11. * debugfs is for people to use instead of /proc or /sys.
  12. * See Documentation/DocBook/kernel-api for more details.
  13. */
  14. #ifndef _DEBUGFS_H_
  15. #define _DEBUGFS_H_
  16. #include <linux/fs.h>
  17. #include <linux/types.h>
  18. struct file_operations;
  19. struct debugfs_blob_wrapper {
  20. void *data;
  21. unsigned long size;
  22. };
  23. #if defined(CONFIG_DEBUG_FS)
  24. struct dentry *debugfs_create_file(const char *name, mode_t mode,
  25. struct dentry *parent, void *data,
  26. const struct file_operations *fops);
  27. struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);
  28. struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
  29. const char *dest);
  30. void debugfs_remove(struct dentry *dentry);
  31. struct dentry *debugfs_create_u8(const char *name, mode_t mode,
  32. struct dentry *parent, u8 *value);
  33. struct dentry *debugfs_create_u16(const char *name, mode_t mode,
  34. struct dentry *parent, u16 *value);
  35. struct dentry *debugfs_create_u32(const char *name, mode_t mode,
  36. struct dentry *parent, u32 *value);
  37. struct dentry *debugfs_create_bool(const char *name, mode_t mode,
  38. struct dentry *parent, u32 *value);
  39. struct dentry *debugfs_create_blob(const char *name, mode_t mode,
  40. struct dentry *parent,
  41. struct debugfs_blob_wrapper *blob);
  42. #else
  43. #include <linux/err.h>
  44. /*
  45. * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
  46. * so users have a chance to detect if there was a real error or not. We don't
  47. * want to duplicate the design decision mistakes of procfs and devfs again.
  48. */
  49. static inline struct dentry *debugfs_create_file(const char *name, mode_t mode,
  50. struct dentry *parent, void *data,
  51. const struct file_operations *fops)
  52. {
  53. return ERR_PTR(-ENODEV);
  54. }
  55. static inline struct dentry *debugfs_create_dir(const char *name,
  56. struct dentry *parent)
  57. {
  58. return ERR_PTR(-ENODEV);
  59. }
  60. static inline struct dentry *debugfs_create_symlink(const char *name,
  61. struct dentry *parent,
  62. const char *dest)
  63. {
  64. return ERR_PTR(-ENODEV);
  65. }
  66. static inline void debugfs_remove(struct dentry *dentry)
  67. { }
  68. static inline struct dentry *debugfs_create_u8(const char *name, mode_t mode,
  69. struct dentry *parent,
  70. u8 *value)
  71. {
  72. return ERR_PTR(-ENODEV);
  73. }
  74. static inline struct dentry *debugfs_create_u16(const char *name, mode_t mode,
  75. struct dentry *parent,
  76. u16 *value)
  77. {
  78. return ERR_PTR(-ENODEV);
  79. }
  80. static inline struct dentry *debugfs_create_u32(const char *name, mode_t mode,
  81. struct dentry *parent,
  82. u32 *value)
  83. {
  84. return ERR_PTR(-ENODEV);
  85. }
  86. static inline struct dentry *debugfs_create_bool(const char *name, mode_t mode,
  87. struct dentry *parent,
  88. u32 *value)
  89. {
  90. return ERR_PTR(-ENODEV);
  91. }
  92. static inline struct dentry *debugfs_create_blob(const char *name, mode_t mode,
  93. struct dentry *parent,
  94. struct debugfs_blob_wrapper *blob)
  95. {
  96. return ERR_PTR(-ENODEV);
  97. }
  98. #endif
  99. #endif