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/fwnode.h>
  17 #include <linux/types.h>
  18
  19 struct device;
  20
  21 enum dev_prop_type {
  22         DEV_PROP_U8,
  23         DEV_PROP_U16,
  24         DEV_PROP_U32,
  25         DEV_PROP_U64,
  26         DEV_PROP_STRING,
  27         DEV_PROP_MAX,
  28 };
  29
  30 enum dev_dma_attr {
  31         DEV_DMA_NOT_SUPPORTED,
  32         DEV_DMA_NON_COHERENT,
  33         DEV_DMA_COHERENT,
  34 };
  35
  36 struct fwnode_handle *dev_fwnode(struct device *dev);
  37
  38 bool device_property_present(struct device *dev, const char *propname);
  39 int device_property_read_u8_array(struct device *dev, const char *propname,
  40                                   u8 *val, size_t nval);
  41 int device_property_read_u16_array(struct device *dev, const char *propname,
  42                                    u16 *val, size_t nval);
  43 int device_property_read_u32_array(struct device *dev, const char *propname,
  44                                    u32 *val, size_t nval);
  45 int device_property_read_u64_array(struct device *dev, const char *propname,
  46                                    u64 *val, size_t nval);
  47 int device_property_read_string_array(struct device *dev, const char *propname,
  48                                       const char **val, size_t nval);
  49 int device_property_read_string(struct device *dev, const char *propname,
  50                                 const char **val);
  51 int device_property_match_string(struct device *dev,
  52                                  const char *propname, const char *string);
  53
  54 bool fwnode_device_is_available(struct fwnode_handle *fwnode);
  55 bool fwnode_property_present(struct fwnode_handle *fwnode, const char *propname);
  56 int fwnode_property_read_u8_array(struct fwnode_handle *fwnode,
  57                                   const char *propname, u8 *val,
  58                                   size_t nval);
  59 int fwnode_property_read_u16_array(struct fwnode_handle *fwnode,
  60                                    const char *propname, u16 *val,
  61                                    size_t nval);
  62 int fwnode_property_read_u32_array(struct fwnode_handle *fwnode,
  63                                    const char *propname, u32 *val,
  64                                    size_t nval);
  65 int fwnode_property_read_u64_array(struct fwnode_handle *fwnode,
  66                                    const char *propname, u64 *val,
  67                                    size_t nval);
  68 int fwnode_property_read_string_array(struct fwnode_handle *fwnode,
  69                                       const char *propname, const char **val,
  70                                       size_t nval);
  71 int fwnode_property_read_string(struct fwnode_handle *fwnode,
  72                                 const char *propname, const char **val);
  73 int fwnode_property_match_string(struct fwnode_handle *fwnode,
  74                                  const char *propname, const char *string);
  75
  76 struct fwnode_handle *fwnode_get_parent(struct fwnode_handle *fwnode);
  77 struct fwnode_handle *fwnode_get_next_parent(struct fwnode_handle *fwnode);
  78 struct fwnode_handle *fwnode_get_next_child_node(struct fwnode_handle *fwnode,
  79                                                  struct fwnode_handle *child);
  80
  81 #define fwnode_for_each_child_node(fwnode, child)                       \
  82         for (child = fwnode_get_next_child_node(fwnode, NULL); child;   \
  83              child = fwnode_get_next_child_node(fwnode, child))
  84
  85 struct fwnode_handle *device_get_next_child_node(struct device *dev,
  86                                                  struct fwnode_handle *child);
  87
  88 #define device_for_each_child_node(dev, child)                          \
  89         for (child = device_get_next_child_node(dev, NULL); child;      \
  90              child = device_get_next_child_node(dev, child))
  91
  92 struct fwnode_handle *fwnode_get_named_child_node(struct fwnode_handle *fwnode,
  93                                                   const char *childname);
  94 struct fwnode_handle *device_get_named_child_node(struct device *dev,
  95                                                   const char *childname);
  96
  97 void fwnode_handle_get(struct fwnode_handle *fwnode);
  98 void fwnode_handle_put(struct fwnode_handle *fwnode);
  99
 100 unsigned int device_get_child_node_count(struct device *dev);
 101
 102 static inline bool device_property_read_bool(struct device *dev,
 103                                              const char *propname)
 104 {
 105         return device_property_present(dev, propname);
 106 }
 107
 108 static inline int device_property_read_u8(struct device *dev,
 109                                           const char *propname, u8 *val)
 110 {
 111         return device_property_read_u8_array(dev, propname, val, 1);
 112 }
 113
 114 static inline int device_property_read_u16(struct device *dev,
 115                                            const char *propname, u16 *val)
 116 {
 117         return device_property_read_u16_array(dev, propname, val, 1);
 118 }
 119
 120 static inline int device_property_read_u32(struct device *dev,
 121                                            const char *propname, u32 *val)
 122 {
 123         return device_property_read_u32_array(dev, propname, val, 1);
 124 }
 125
 126 static inline int device_property_read_u64(struct device *dev,
 127                                            const char *propname, u64 *val)
 128 {
 129         return device_property_read_u64_array(dev, propname, val, 1);
 130 }
 131
 132 static inline bool fwnode_property_read_bool(struct fwnode_handle *fwnode,
 133                                              const char *propname)
 134 {
 135         return fwnode_property_present(fwnode, propname);
 136 }
 137
 138 static inline int fwnode_property_read_u8(struct fwnode_handle *fwnode,
 139                                           const char *propname, u8 *val)
 140 {
 141         return fwnode_property_read_u8_array(fwnode, propname, val, 1);
 142 }
 143
 144 static inline int fwnode_property_read_u16(struct fwnode_handle *fwnode,
 145                                            const char *propname, u16 *val)
 146 {
 147         return fwnode_property_read_u16_array(fwnode, propname, val, 1);
 148 }
 149
 150 static inline int fwnode_property_read_u32(struct fwnode_handle *fwnode,
 151                                            const char *propname, u32 *val)
 152 {
 153         return fwnode_property_read_u32_array(fwnode, propname, val, 1);
 154 }
 155
 156 static inline int fwnode_property_read_u64(struct fwnode_handle *fwnode,
 157                                            const char *propname, u64 *val)
 158 {
 159         return fwnode_property_read_u64_array(fwnode, propname, val, 1);
 160 }
 161
 162 /**
 163  * struct property_entry - "Built-in" device property representation.
 164  * @name: Name of the property.
 165  * @length: Length of data making up the value.
 166  * @is_array: True when the property is an array.
 167  * @is_string: True when property is a string.
 168  * @pointer: Pointer to the property (an array of items of the given type).
 169  * @value: Value of the property (when it is a single item of the given type).
 170  */
 171 struct property_entry {
 172         const char *name;
 173         size_t length;
 174         bool is_array;
 175         bool is_string;
 176         union {
 177                 union {
 178                         const void *raw_data;
 179                         const u8 *u8_data;
 180                         const u16 *u16_data;
 181                         const u32 *u32_data;
 182                         const u64 *u64_data;
 183                         const char * const *str;
 184                 } pointer;
 185                 union {
 186                         unsigned long long raw_data;
 187                         u8 u8_data;
 188                         u16 u16_data;
 189                         u32 u32_data;
 190                         u64 u64_data;
 191                         const char *str;
 192                 } value;
 193         };
 194 };
 195
 196 /*
 197  * Note: the below four initializers for the anonymous union are carefully
 198  * crafted to avoid gcc-4.4.4's problems with initialization of anon unions
 199  * and structs.
 200  */
 201
 202 #define PROPERTY_ENTRY_INTEGER_ARRAY(_name_, _type_, _val_)     \
 203 {                                                               \
 204         .name = _name_,                                         \
 205         .length = ARRAY_SIZE(_val_) * sizeof(_type_),           \
 206         .is_array = true,                                       \
 207         .is_string = false,                                     \
 208         { .pointer = { ._type_##_data = _val_ } },              \
 209 }
 210
 211 #define PROPERTY_ENTRY_U8_ARRAY(_name_, _val_)                  \
 212         PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u8, _val_)
 213 #define PROPERTY_ENTRY_U16_ARRAY(_name_, _val_)                 \
 214         PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u16, _val_)
 215 #define PROPERTY_ENTRY_U32_ARRAY(_name_, _val_)                 \
 216         PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u32, _val_)
 217 #define PROPERTY_ENTRY_U64_ARRAY(_name_, _val_)                 \
 218         PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u64, _val_)
 219
 220 #define PROPERTY_ENTRY_STRING_ARRAY(_name_, _val_)              \
 221 {                                                               \
 222         .name = _name_,                                         \
 223         .length = ARRAY_SIZE(_val_) * sizeof(const char *),     \
 224         .is_array = true,                                       \
 225         .is_string = true,                                      \
 226         { .pointer = { .str = _val_ } },                        \
 227 }
 228
 229 #define PROPERTY_ENTRY_INTEGER(_name_, _type_, _val_)   \
 230 {                                                       \
 231         .name = _name_,                                 \
 232         .length = sizeof(_type_),                       \
 233         .is_string = false,                             \
 234         { .value = { ._type_##_data = _val_ } },        \
 235 }
 236
 237 #define PROPERTY_ENTRY_U8(_name_, _val_)                \
 238         PROPERTY_ENTRY_INTEGER(_name_, u8, _val_)
 239 #define PROPERTY_ENTRY_U16(_name_, _val_)               \
 240         PROPERTY_ENTRY_INTEGER(_name_, u16, _val_)
 241 #define PROPERTY_ENTRY_U32(_name_, _val_)               \
 242         PROPERTY_ENTRY_INTEGER(_name_, u32, _val_)
 243 #define PROPERTY_ENTRY_U64(_name_, _val_)               \
 244         PROPERTY_ENTRY_INTEGER(_name_, u64, _val_)
 245
 246 #define PROPERTY_ENTRY_STRING(_name_, _val_)            \
 247 {                                                       \
 248         .name = _name_,                                 \
 249         .length = sizeof(_val_),                        \
 250         .is_string = true,                              \
 251         { .value = { .str = _val_ } },                  \
 252 }
 253
 254 #define PROPERTY_ENTRY_BOOL(_name_)             \
 255 {                                               \
 256         .name = _name_,                         \
 257 }
 258
 259 struct property_entry *
 260 property_entries_dup(const struct property_entry *properties);
 261
 262 void property_entries_free(const struct property_entry *properties);
 263
 264 int device_add_properties(struct device *dev,
 265                           const struct property_entry *properties);
 266 void device_remove_properties(struct device *dev);
 267
 268 bool device_dma_supported(struct device *dev);
 269
 270 enum dev_dma_attr device_get_dma_attr(struct device *dev);
 271
 272 int device_get_phy_mode(struct device *dev);
 273
 274 void *device_get_mac_address(struct device *dev, char *addr, int alen);
 275
 276 struct fwnode_handle *fwnode_graph_get_next_endpoint(
 277         struct fwnode_handle *fwnode, struct fwnode_handle *prev);
 278 struct fwnode_handle *
 279 fwnode_graph_get_port_parent(struct fwnode_handle *fwnode);
 280 struct fwnode_handle *fwnode_graph_get_remote_port_parent(
 281         struct fwnode_handle *fwnode);
 282 struct fwnode_handle *fwnode_graph_get_remote_port(
 283         struct fwnode_handle *fwnode);
 284 struct fwnode_handle *fwnode_graph_get_remote_endpoint(
 285         struct fwnode_handle *fwnode);
 286 struct fwnode_handle *fwnode_graph_get_remote_node(struct fwnode_handle *fwnode,
 287                                                    u32 port, u32 endpoint);
 288
 289 int fwnode_graph_parse_endpoint(struct fwnode_handle *fwnode,
 290                                 struct fwnode_endpoint *endpoint);
 291
 292 #endif /* _LINUX_PROPERTY_H_ */