include/linux/property.h

   1 /*
   2  * property.h - Unified device property interface.
   3  *
   4  * Copyright (C) 2014, Intel Corporation
   5  * Authors: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
   6  *          Mika Westerberg <mika.westerberg@linux.intel.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #ifndef _LINUX_PROPERTY_H_
  14 #define _LINUX_PROPERTY_H_
  15
  16 #include <linux/types.h>
  17
  18 struct device;
  19
  20 enum dev_prop_type {
  21         DEV_PROP_U8,
  22         DEV_PROP_U16,
  23         DEV_PROP_U32,
  24         DEV_PROP_U64,
  25         DEV_PROP_STRING,
  26         DEV_PROP_MAX,
  27 };
  28
  29 bool device_property_present(struct device *dev, const char *propname);
  30 int device_property_read_u8_array(struct device *dev, const char *propname,
  31                                   u8 *val, size_t nval);
  32 int device_property_read_u16_array(struct device *dev, const char *propname,
  33                                    u16 *val, size_t nval);
  34 int device_property_read_u32_array(struct device *dev, const char *propname,
  35                                    u32 *val, size_t nval);
  36 int device_property_read_u64_array(struct device *dev, const char *propname,
  37                                    u64 *val, size_t nval);
  38 int device_property_read_string_array(struct device *dev, const char *propname,
  39                                       const char **val, size_t nval);
  40 int device_property_read_string(struct device *dev, const char *propname,
  41                                 const char **val);
  42
  43 enum fwnode_type {
  44         FWNODE_INVALID = 0,
  45         FWNODE_OF,
  46         FWNODE_ACPI,
  47 };
  48
  49 struct fwnode_handle {
  50         enum fwnode_type type;
  51 };
  52
  53 bool fwnode_property_present(struct fwnode_handle *fwnode, const char *propname);
  54 int fwnode_property_read_u8_array(struct fwnode_handle *fwnode,
  55                                   const char *propname, u8 *val,
  56                                   size_t nval);
  57 int fwnode_property_read_u16_array(struct fwnode_handle *fwnode,
  58                                    const char *propname, u16 *val,
  59                                    size_t nval);
  60 int fwnode_property_read_u32_array(struct fwnode_handle *fwnode,
  61                                    const char *propname, u32 *val,
  62                                    size_t nval);
  63 int fwnode_property_read_u64_array(struct fwnode_handle *fwnode,
  64                                    const char *propname, u64 *val,
  65                                    size_t nval);
  66 int fwnode_property_read_string_array(struct fwnode_handle *fwnode,
  67                                       const char *propname, const char **val,
  68                                       size_t nval);
  69 int fwnode_property_read_string(struct fwnode_handle *fwnode,
  70                                 const char *propname, const char **val);
  71
  72 struct fwnode_handle *device_get_next_child_node(struct device *dev,
  73                                                  struct fwnode_handle *child);
  74
  75 #define device_for_each_child_node(dev, child) \
  76         for (child = device_get_next_child_node(dev, NULL); child; \
  77              child = device_get_next_child_node(dev, child))
  78
  79 void fwnode_handle_put(struct fwnode_handle *fwnode);
  80
  81 unsigned int device_get_child_node_count(struct device *dev);
  82
  83 static inline bool device_property_read_bool(struct device *dev,
  84                                              const char *propname)
  85 {
  86         return device_property_present(dev, propname);
  87 }
  88
  89 static inline int device_property_read_u8(struct device *dev,
  90                                           const char *propname, u8 *val)
  91 {
  92         return device_property_read_u8_array(dev, propname, val, 1);
  93 }
  94
  95 static inline int device_property_read_u16(struct device *dev,
  96                                            const char *propname, u16 *val)
  97 {
  98         return device_property_read_u16_array(dev, propname, val, 1);
  99 }
 100
 101 static inline int device_property_read_u32(struct device *dev,
 102                                            const char *propname, u32 *val)
 103 {
 104         return device_property_read_u32_array(dev, propname, val, 1);
 105 }
 106
 107 static inline int device_property_read_u64(struct device *dev,
 108                                            const char *propname, u64 *val)
 109 {
 110         return device_property_read_u64_array(dev, propname, val, 1);
 111 }
 112
 113 static inline bool fwnode_property_read_bool(struct fwnode_handle *fwnode,
 114                                              const char *propname)
 115 {
 116         return fwnode_property_present(fwnode, propname);
 117 }
 118
 119 static inline int fwnode_property_read_u8(struct fwnode_handle *fwnode,
 120                                           const char *propname, u8 *val)
 121 {
 122         return fwnode_property_read_u8_array(fwnode, propname, val, 1);
 123 }
 124
 125 static inline int fwnode_property_read_u16(struct fwnode_handle *fwnode,
 126                                            const char *propname, u16 *val)
 127 {
 128         return fwnode_property_read_u16_array(fwnode, propname, val, 1);
 129 }
 130
 131 static inline int fwnode_property_read_u32(struct fwnode_handle *fwnode,
 132                                            const char *propname, u32 *val)
 133 {
 134         return fwnode_property_read_u32_array(fwnode, propname, val, 1);
 135 }
 136
 137 static inline int fwnode_property_read_u64(struct fwnode_handle *fwnode,
 138                                            const char *propname, u64 *val)
 139 {
 140         return fwnode_property_read_u64_array(fwnode, propname, val, 1);
 141 }
 142
 143 #endif /* _LINUX_PROPERTY_H_ */