/*
 * property.h - Unified device property interface.
 *
 * Copyright (C) 2014, Intel Corporation
 * Authors: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 *          Mika Westerberg <mika.westerberg@linux.intel.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef _LINUX_PROPERTY_H_
#define _LINUX_PROPERTY_H_

#include <linux/fwnode.h>
#include <linux/types.h>

struct device;

enum dev_prop_type {
        DEV_PROP_U8,
        DEV_PROP_U16,
        DEV_PROP_U32,
        DEV_PROP_U64,
        DEV_PROP_STRING,
        DEV_PROP_MAX,
};

enum dev_dma_attr {
        DEV_DMA_NOT_SUPPORTED,
        DEV_DMA_NON_COHERENT,
        DEV_DMA_COHERENT,
};

bool device_property_present(struct device *dev, const char *propname);
int device_property_read_u8_array(struct device *dev, const char *propname,
                                  u8 *val, size_t nval);
int device_property_read_u16_array(struct device *dev, const char *propname,
                                   u16 *val, size_t nval);
int device_property_read_u32_array(struct device *dev, const char *propname,
                                   u32 *val, size_t nval);
int device_property_read_u64_array(struct device *dev, const char *propname,
                                   u64 *val, size_t nval);
int device_property_read_string_array(struct device *dev, const char *propname,
                                      const char **val, size_t nval);
int device_property_read_string(struct device *dev, const char *propname,
                                const char **val);
int device_property_match_string(struct device *dev,
                                 const char *propname, const char *string);

bool fwnode_property_present(struct fwnode_handle *fwnode, const char *propname);
int fwnode_property_read_u8_array(struct fwnode_handle *fwnode,
                                  const char *propname, u8 *val,
                                  size_t nval);
int fwnode_property_read_u16_array(struct fwnode_handle *fwnode,
                                   const char *propname, u16 *val,
                                   size_t nval);
int fwnode_property_read_u32_array(struct fwnode_handle *fwnode,
                                   const char *propname, u32 *val,
                                   size_t nval);
int fwnode_property_read_u64_array(struct fwnode_handle *fwnode,
                                   const char *propname, u64 *val,
                                   size_t nval);
int fwnode_property_read_string_array(struct fwnode_handle *fwnode,
                                      const char *propname, const char **val,
                                      size_t nval);
int fwnode_property_read_string(struct fwnode_handle *fwnode,
                                const char *propname, const char **val);
int fwnode_property_match_string(struct fwnode_handle *fwnode,
                                 const char *propname, const char *string);

struct fwnode_handle *device_get_next_child_node(struct device *dev,
                                                 struct fwnode_handle *child);

#define device_for_each_child_node(dev, child)                          \
        for (child = device_get_next_child_node(dev, NULL); child;      \
             child = device_get_next_child_node(dev, child))

void fwnode_handle_put(struct fwnode_handle *fwnode);

unsigned int device_get_child_node_count(struct device *dev);

static inline bool device_property_read_bool(struct device *dev,
                                             const char *propname)
{
        return device_property_present(dev, propname);
}

static inline int device_property_read_u8(struct device *dev,
                                          const char *propname, u8 *val)
{
        return device_property_read_u8_array(dev, propname, val, 1);
}

static inline int device_property_read_u16(struct device *dev,
                                           const char *propname, u16 *val)
{
        return device_property_read_u16_array(dev, propname, val, 1);
}

static inline int device_property_read_u32(struct device *dev,
                                           const char *propname, u32 *val)
{
        return device_property_read_u32_array(dev, propname, val, 1);
}

static inline int device_property_read_u64(struct device *dev,
                                           const char *propname, u64 *val)
{
        return device_property_read_u64_array(dev, propname, val, 1);
}

static inline bool fwnode_property_read_bool(struct fwnode_handle *fwnode,
                                             const char *propname)
{
        return fwnode_property_present(fwnode, propname);
}

static inline int fwnode_property_read_u8(struct fwnode_handle *fwnode,
                                          const char *propname, u8 *val)
{
        return fwnode_property_read_u8_array(fwnode, propname, val, 1);
}

static inline int fwnode_property_read_u16(struct fwnode_handle *fwnode,
                                           const char *propname, u16 *val)
{
        return fwnode_property_read_u16_array(fwnode, propname, val, 1);
}

static inline int fwnode_property_read_u32(struct fwnode_handle *fwnode,
                                           const char *propname, u32 *val)
{
        return fwnode_property_read_u32_array(fwnode, propname, val, 1);
}

static inline int fwnode_property_read_u64(struct fwnode_handle *fwnode,
                                           const char *propname, u64 *val)
{
        return fwnode_property_read_u64_array(fwnode, propname, val, 1);
}

/**
 * struct property_entry - "Built-in" device property representation.
 * @name: Name of the property.
 * @length: Length of data making up the value.
 * @is_array: True when the property is an array.
 * @is_string: True when property is a string.
 * @pointer: Pointer to the property (an array of items of the given type).
 * @value: Value of the property (when it is a single item of the given type).
 */
struct property_entry {
        const char *name;
        size_t length;
        bool is_array;
        bool is_string;
        union {
                union {
                        void *raw_data;
                        u8 *u8_data;
                        u16 *u16_data;
                        u32 *u32_data;
                        u64 *u64_data;
                        const char **str;
                } pointer;
                union {
                        unsigned long long raw_data;
                        u8 u8_data;
                        u16 u16_data;
                        u32 u32_data;
                        u64 u64_data;
                        const char *str;
                } value;
        };
};

/*
 * Note: the below four initializers for the anonymous union are carefully
 * crafted to avoid gcc-4.4.4's problems with initialization of anon unions
 * and structs.
 */

#define PROPERTY_ENTRY_INTEGER_ARRAY(_name_, _type_, _val_)     \
{                                                               \
        .name = _name_,                                         \
        .length = ARRAY_SIZE(_val_) * sizeof(_type_),           \
        .is_array = true,                                       \
        .is_string = false,                                     \
        { .pointer = { _type_##_data = _val_ } },               \
}

#define PROPERTY_ENTRY_U8_ARRAY(_name_, _val_)                  \
        PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u8, _val_)
#define PROPERTY_ENTRY_U16_ARRAY(_name_, _val_)                 \
        PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u16, _val_)
#define PROPERTY_ENTRY_U32_ARRAY(_name_, _val_)                 \
        PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u32, _val_)
#define PROPERTY_ENTRY_U64_ARRAY(_name_, _val_)                 \
        PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u64, _val_)

#define PROPERTY_ENTRY_STRING_ARRAY(_name_, _val_)              \
{                                                               \
        .name = _name_,                                         \
        .length = ARRAY_SIZE(_val_) * sizeof(const char *),     \
        .is_array = true,                                       \
        .is_string = true,                                      \
        { .pointer = { .str = _val_ } },                        \
}

#define PROPERTY_ENTRY_INTEGER(_name_, _type_, _val_)   \
{                                                       \
        .name = _name_,                                 \
        .length = sizeof(_type_),                       \
        .is_string = false,                             \
        { .value = { ._type_##_data = _val_ } },        \
}

#define PROPERTY_ENTRY_U8(_name_, _val_)                \
        PROPERTY_ENTRY_INTEGER(_name_, u8, _val_)
#define PROPERTY_ENTRY_U16(_name_, _val_)               \
        PROPERTY_ENTRY_INTEGER(_name_, u16, _val_)
#define PROPERTY_ENTRY_U32(_name_, _val_)               \
        PROPERTY_ENTRY_INTEGER(_name_, u32, _val_)
#define PROPERTY_ENTRY_U64(_name_, _val_)               \
        PROPERTY_ENTRY_INTEGER(_name_, u64, _val_)

#define PROPERTY_ENTRY_STRING(_name_, _val_)            \
{                                                       \
        .name = _name_,                                 \
        .length = sizeof(_val_),                        \
        .is_string = true,                              \
        { .value = { .str = _val_ } },                  \
}

#define PROPERTY_ENTRY_BOOL(_name_)             \
{                                               \
        .name = _name_,                         \
}

/**
 * struct property_set - Collection of "built-in" device properties.
 * @fwnode: Handle to be pointed to by the fwnode field of struct device.
 * @properties: Array of properties terminated with a null entry.
 */
struct property_set {
        struct fwnode_handle fwnode;
        struct property_entry *properties;
};

int device_add_property_set(struct device *dev, const struct property_set *pset);
void device_remove_property_set(struct device *dev);

bool device_dma_supported(struct device *dev);

enum dev_dma_attr device_get_dma_attr(struct device *dev);

int device_get_phy_mode(struct device *dev);

void *device_get_mac_address(struct device *dev, char *addr, int alen);

#endif /* _LINUX_PROPERTY_H_ */