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(const struct fwnode_handle *fwnode);
  55 bool fwnode_property_present(const struct fwnode_handle *fwnode,
  56                              const char *propname);
  57 int fwnode_property_read_u8_array(const struct fwnode_handle *fwnode,
  58                                   const char *propname, u8 *val,
  59                                   size_t nval);
  60 int fwnode_property_read_u16_array(const struct fwnode_handle *fwnode,
  61                                    const char *propname, u16 *val,
  62                                    size_t nval);
  63 int fwnode_property_read_u32_array(const struct fwnode_handle *fwnode,
  64                                    const char *propname, u32 *val,
  65                                    size_t nval);
  66 int fwnode_property_read_u64_array(const struct fwnode_handle *fwnode,
  67                                    const char *propname, u64 *val,
  68                                    size_t nval);
  69 int fwnode_property_read_string_array(const struct fwnode_handle *fwnode,
  70                                       const char *propname, const char **val,
  71                                       size_t nval);
  72 int fwnode_property_read_string(const struct fwnode_handle *fwnode,
  73                                 const char *propname, const char **val);
  74 int fwnode_property_match_string(const struct fwnode_handle *fwnode,
  75                                  const char *propname, const char *string);
  76 int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode,
  77                                        const char *prop, const char *nargs_prop,
  78                                        unsigned int nargs, unsigned int index,
  79                                        struct fwnode_reference_args *args);
  80
  81 struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode);
  82 struct fwnode_handle *fwnode_get_next_parent(
  83         struct fwnode_handle *fwnode);
  84 struct fwnode_handle *fwnode_get_next_child_node(
  85         const struct fwnode_handle *fwnode, struct fwnode_handle *child);
  86 struct fwnode_handle *fwnode_get_next_available_child_node(
  87         const struct fwnode_handle *fwnode, struct fwnode_handle *child);
  88
  89 #define fwnode_for_each_child_node(fwnode, child)                       \
  90         for (child = fwnode_get_next_child_node(fwnode, NULL); child;   \
  91              child = fwnode_get_next_child_node(fwnode, child))
  92
  93 #define fwnode_for_each_available_child_node(fwnode, child)                    \
  94         for (child = fwnode_get_next_available_child_node(fwnode, NULL); child;\
  95              child = fwnode_get_next_available_child_node(fwnode, child))
  96
  97 struct fwnode_handle *device_get_next_child_node(
  98         struct device *dev, struct fwnode_handle *child);
  99
 100 #define device_for_each_child_node(dev, child)                          \
 101         for (child = device_get_next_child_node(dev, NULL); child;      \
 102              child = device_get_next_child_node(dev, child))
 103
 104 struct fwnode_handle *fwnode_get_named_child_node(
 105         const struct fwnode_handle *fwnode, const char *childname);
 106 struct fwnode_handle *device_get_named_child_node(struct device *dev,
 107                                                   const char *childname);
 108
 109 struct fwnode_handle *fwnode_handle_get(struct fwnode_handle *fwnode);
 110 void fwnode_handle_put(struct fwnode_handle *fwnode);
 111
 112 int fwnode_irq_get(struct fwnode_handle *fwnode, unsigned int index);
 113
 114 unsigned int device_get_child_node_count(struct device *dev);
 115
 116 static inline bool device_property_read_bool(struct device *dev,
 117                                              const char *propname)
 118 {
 119         return device_property_present(dev, propname);
 120 }
 121
 122 static inline int device_property_read_u8(struct device *dev,
 123                                           const char *propname, u8 *val)
 124 {
 125         return device_property_read_u8_array(dev, propname, val, 1);
 126 }
 127
 128 static inline int device_property_read_u16(struct device *dev,
 129                                            const char *propname, u16 *val)
 130 {
 131         return device_property_read_u16_array(dev, propname, val, 1);
 132 }
 133
 134 static inline int device_property_read_u32(struct device *dev,
 135                                            const char *propname, u32 *val)
 136 {
 137         return device_property_read_u32_array(dev, propname, val, 1);
 138 }
 139
 140 static inline int device_property_read_u64(struct device *dev,
 141                                            const char *propname, u64 *val)
 142 {
 143         return device_property_read_u64_array(dev, propname, val, 1);
 144 }
 145
 146 static inline bool fwnode_property_read_bool(const struct fwnode_handle *fwnode,
 147                                              const char *propname)
 148 {
 149         return fwnode_property_present(fwnode, propname);
 150 }
 151
 152 static inline int fwnode_property_read_u8(const struct fwnode_handle *fwnode,
 153                                           const char *propname, u8 *val)
 154 {
 155         return fwnode_property_read_u8_array(fwnode, propname, val, 1);
 156 }
 157
 158 static inline int fwnode_property_read_u16(const struct fwnode_handle *fwnode,
 159                                            const char *propname, u16 *val)
 160 {
 161         return fwnode_property_read_u16_array(fwnode, propname, val, 1);
 162 }
 163
 164 static inline int fwnode_property_read_u32(const struct fwnode_handle *fwnode,
 165                                            const char *propname, u32 *val)
 166 {
 167         return fwnode_property_read_u32_array(fwnode, propname, val, 1);
 168 }
 169
 170 static inline int fwnode_property_read_u64(const struct fwnode_handle *fwnode,
 171                                            const char *propname, u64 *val)
 172 {
 173         return fwnode_property_read_u64_array(fwnode, propname, val, 1);
 174 }
 175
 176 /**
 177  * struct property_entry - "Built-in" device property representation.
 178  * @name: Name of the property.
 179  * @length: Length of data making up the value.
 180  * @is_array: True when the property is an array.
 181  * @is_string: True when property is a string.
 182  * @pointer: Pointer to the property (an array of items of the given type).
 183  * @value: Value of the property (when it is a single item of the given type).
 184  */
 185 struct property_entry {
 186         const char *name;
 187         size_t length;
 188         bool is_array;
 189         bool is_string;
 190         union {
 191                 union {
 192                         const void *raw_data;
 193                         const u8 *u8_data;
 194                         const u16 *u16_data;
 195                         const u32 *u32_data;
 196                         const u64 *u64_data;
 197                         const char * const *str;
 198                 } pointer;
 199                 union {
 200                         unsigned long long raw_data;
 201                         u8 u8_data;
 202                         u16 u16_data;
 203                         u32 u32_data;
 204                         u64 u64_data;
 205                         const char *str;
 206                 } value;
 207         };
 208 };
 209
 210 /*
 211  * Note: the below four initializers for the anonymous union are carefully
 212  * crafted to avoid gcc-4.4.4's problems with initialization of anon unions
 213  * and structs.
 214  */
 215
 216 #define PROPERTY_ENTRY_INTEGER_ARRAY(_name_, _type_, _val_)     \
 217 (struct property_entry) {                                       \
 218         .name = _name_,                                         \
 219         .length = ARRAY_SIZE(_val_) * sizeof(_type_),           \
 220         .is_array = true,                                       \
 221         .is_string = false,                                     \
 222         { .pointer = { ._type_##_data = _val_ } },              \
 223 }
 224
 225 #define PROPERTY_ENTRY_U8_ARRAY(_name_, _val_)                  \
 226         PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u8, _val_)
 227 #define PROPERTY_ENTRY_U16_ARRAY(_name_, _val_)                 \
 228         PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u16, _val_)
 229 #define PROPERTY_ENTRY_U32_ARRAY(_name_, _val_)                 \
 230         PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u32, _val_)
 231 #define PROPERTY_ENTRY_U64_ARRAY(_name_, _val_)                 \
 232         PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u64, _val_)
 233
 234 #define PROPERTY_ENTRY_STRING_ARRAY(_name_, _val_)              \
 235 (struct property_entry) {                                       \
 236         .name = _name_,                                         \
 237         .length = ARRAY_SIZE(_val_) * sizeof(const char *),     \
 238         .is_array = true,                                       \
 239         .is_string = true,                                      \
 240         { .pointer = { .str = _val_ } },                        \
 241 }
 242
 243 #define PROPERTY_ENTRY_INTEGER(_name_, _type_, _val_)   \
 244 (struct property_entry) {                               \
 245         .name = _name_,                                 \
 246         .length = sizeof(_type_),                       \
 247         .is_string = false,                             \
 248         { .value = { ._type_##_data = _val_ } },        \
 249 }
 250
 251 #define PROPERTY_ENTRY_U8(_name_, _val_)                \
 252         PROPERTY_ENTRY_INTEGER(_name_, u8, _val_)
 253 #define PROPERTY_ENTRY_U16(_name_, _val_)               \
 254         PROPERTY_ENTRY_INTEGER(_name_, u16, _val_)
 255 #define PROPERTY_ENTRY_U32(_name_, _val_)               \
 256         PROPERTY_ENTRY_INTEGER(_name_, u32, _val_)
 257 #define PROPERTY_ENTRY_U64(_name_, _val_)               \
 258         PROPERTY_ENTRY_INTEGER(_name_, u64, _val_)
 259
 260 #define PROPERTY_ENTRY_STRING(_name_, _val_)            \
 261 (struct property_entry) {                               \
 262         .name = _name_,                                 \
 263         .length = sizeof(_val_),                        \
 264         .is_string = true,                              \
 265         { .value = { .str = _val_ } },                  \
 266 }
 267
 268 #define PROPERTY_ENTRY_BOOL(_name_)             \
 269 (struct property_entry) {                       \
 270         .name = _name_,                         \
 271 }
 272
 273 struct property_entry *
 274 property_entries_dup(const struct property_entry *properties);
 275
 276 void property_entries_free(const struct property_entry *properties);
 277
 278 int device_add_properties(struct device *dev,
 279                           const struct property_entry *properties);
 280 void device_remove_properties(struct device *dev);
 281
 282 bool device_dma_supported(struct device *dev);
 283
 284 enum dev_dma_attr device_get_dma_attr(struct device *dev);
 285
 286 const void *device_get_match_data(struct device *dev);
 287
 288 int device_get_phy_mode(struct device *dev);
 289
 290 void *device_get_mac_address(struct device *dev, char *addr, int alen);
 291
 292 int fwnode_get_phy_mode(struct fwnode_handle *fwnode);
 293 void *fwnode_get_mac_address(struct fwnode_handle *fwnode,
 294                              char *addr, int alen);
 295 struct fwnode_handle *fwnode_graph_get_next_endpoint(
 296         const struct fwnode_handle *fwnode, struct fwnode_handle *prev);
 297 struct fwnode_handle *
 298 fwnode_graph_get_port_parent(const struct fwnode_handle *fwnode);
 299 struct fwnode_handle *fwnode_graph_get_remote_port_parent(
 300         const struct fwnode_handle *fwnode);
 301 struct fwnode_handle *fwnode_graph_get_remote_port(
 302         const struct fwnode_handle *fwnode);
 303 struct fwnode_handle *fwnode_graph_get_remote_endpoint(
 304         const struct fwnode_handle *fwnode);
 305 struct fwnode_handle *
 306 fwnode_graph_get_remote_node(const struct fwnode_handle *fwnode, u32 port,
 307                              u32 endpoint);
 308
 309 #define fwnode_graph_for_each_endpoint(fwnode, child)                   \
 310         for (child = NULL;                                              \
 311              (child = fwnode_graph_get_next_endpoint(fwnode, child)); )
 312
 313 int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
 314                                 struct fwnode_endpoint *endpoint);
 315
 316 #endif /* _LINUX_PROPERTY_H_ */