Viewing file:  property.h (19.95 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* property.h - Unified device property interface.
*
* Copyright (C) 2014, Intel Corporation
* Authors: Rafael J. Wysocki <[email protected]>
* Mika Westerberg <[email protected]>
*/
#ifndef _LINUX_PROPERTY_H_
#define _LINUX_PROPERTY_H_
#include <linux/args.h>
#include <linux/bits.h>
#include <linux/cleanup.h>
#include <linux/fwnode.h>
#include <linux/stddef.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_REF,
};
enum dev_dma_attr {
DEV_DMA_NOT_SUPPORTED,
DEV_DMA_NON_COHERENT,
DEV_DMA_COHERENT,
};
const struct fwnode_handle *__dev_fwnode_const(const struct device *dev);
struct fwnode_handle *__dev_fwnode(struct device *dev);
#define dev_fwnode(dev) \
_Generic((dev), \
const struct device *: __dev_fwnode_const, \
struct device *: __dev_fwnode)(dev)
bool device_property_present(const struct device *dev, const char *propname);
int device_property_read_u8_array(const struct device *dev, const char *propname,
u8 *val, size_t nval);
int device_property_read_u16_array(const struct device *dev, const char *propname,
u16 *val, size_t nval);
int device_property_read_u32_array(const struct device *dev, const char *propname,
u32 *val, size_t nval);
int device_property_read_u64_array(const struct device *dev, const char *propname,
u64 *val, size_t nval);
int device_property_read_string_array(const struct device *dev, const char *propname,
const char **val, size_t nval);
int device_property_read_string(const struct device *dev, const char *propname,
const char **val);
int device_property_match_string(const struct device *dev,
const char *propname, const char *string);
bool fwnode_property_present(const struct fwnode_handle *fwnode,
const char *propname);
int fwnode_property_read_u8_array(const struct fwnode_handle *fwnode,
const char *propname, u8 *val,
size_t nval);
int fwnode_property_read_u16_array(const struct fwnode_handle *fwnode,
const char *propname, u16 *val,
size_t nval);
int fwnode_property_read_u32_array(const struct fwnode_handle *fwnode,
const char *propname, u32 *val,
size_t nval);
int fwnode_property_read_u64_array(const struct fwnode_handle *fwnode,
const char *propname, u64 *val,
size_t nval);
int fwnode_property_read_string_array(const struct fwnode_handle *fwnode,
const char *propname, const char **val,
size_t nval);
int fwnode_property_read_string(const struct fwnode_handle *fwnode,
const char *propname, const char **val);
int fwnode_property_match_string(const struct fwnode_handle *fwnode,
const char *propname, const char *string);
bool fwnode_device_is_available(const struct fwnode_handle *fwnode);
static inline bool fwnode_device_is_big_endian(const struct fwnode_handle *fwnode)
{
if (fwnode_property_present(fwnode, "big-endian"))
return true;
if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) &&
fwnode_property_present(fwnode, "native-endian"))
return true;
return false;
}
static inline
bool fwnode_device_is_compatible(const struct fwnode_handle *fwnode, const char *compat)
{
return fwnode_property_match_string(fwnode, "compatible", compat) >= 0;
}
/**
* device_is_big_endian - check if a device has BE registers
* @dev: Pointer to the struct device
*
* Returns: true if the device has a "big-endian" property, or if the kernel
* was compiled for BE *and* the device has a "native-endian" property.
* Returns false otherwise.
*
* Callers would nominally use ioread32be/iowrite32be if
* device_is_big_endian() == true, or readl/writel otherwise.
*/
static inline bool device_is_big_endian(const struct device *dev)
{
return fwnode_device_is_big_endian(dev_fwnode(dev));
}
/**
* device_is_compatible - match 'compatible' property of the device with a given string
* @dev: Pointer to the struct device
* @compat: The string to match 'compatible' property with
*
* Returns: true if matches, otherwise false.
*/
static inline bool device_is_compatible(const struct device *dev, const char *compat)
{
return fwnode_device_is_compatible(dev_fwnode(dev), compat);
}
int fwnode_property_match_property_string(const struct fwnode_handle *fwnode,
const char *propname,
const char * const *array, size_t n);
static inline
int device_property_match_property_string(const struct device *dev,
const char *propname,
const char * const *array, size_t n)
{
return fwnode_property_match_property_string(dev_fwnode(dev), propname, array, n);
}
int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode,
const char *prop, const char *nargs_prop,
unsigned int nargs, unsigned int index,
struct fwnode_reference_args *args);
struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode,
const char *name,
unsigned int index);
const char *fwnode_get_name(const struct fwnode_handle *fwnode);
const char *fwnode_get_name_prefix(const struct fwnode_handle *fwnode);
bool fwnode_name_eq(const struct fwnode_handle *fwnode, const char *name);
struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode);
struct fwnode_handle *fwnode_get_next_parent(struct fwnode_handle *fwnode);
#define fwnode_for_each_parent_node(fwnode, parent) \
for (parent = fwnode_get_parent(fwnode); parent; \
parent = fwnode_get_next_parent(parent))
struct device *fwnode_get_next_parent_dev(const struct fwnode_handle *fwnode);
unsigned int fwnode_count_parents(const struct fwnode_handle *fwn);
struct fwnode_handle *fwnode_get_nth_parent(struct fwnode_handle *fwn,
unsigned int depth);
bool fwnode_is_ancestor_of(const struct fwnode_handle *ancestor, const struct fwnode_handle *child);
struct fwnode_handle *fwnode_get_next_child_node(
const struct fwnode_handle *fwnode, struct fwnode_handle *child);
struct fwnode_handle *fwnode_get_next_available_child_node(
const struct fwnode_handle *fwnode, struct fwnode_handle *child);
#define fwnode_for_each_child_node(fwnode, child) \
for (child = fwnode_get_next_child_node(fwnode, NULL); child; \
child = fwnode_get_next_child_node(fwnode, child))
#define fwnode_for_each_available_child_node(fwnode, child) \
for (child = fwnode_get_next_available_child_node(fwnode, NULL); child;\
child = fwnode_get_next_available_child_node(fwnode, child))
struct fwnode_handle *device_get_next_child_node(const 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))
#define device_for_each_child_node_scoped(dev, child) \
for (struct fwnode_handle *child __free(fwnode_handle) = \
device_get_next_child_node(dev, NULL); \
child; child = device_get_next_child_node(dev, child))
struct fwnode_handle *fwnode_get_named_child_node(const struct fwnode_handle *fwnode,
const char *childname);
struct fwnode_handle *device_get_named_child_node(const struct device *dev,
const char *childname);
struct fwnode_handle *fwnode_handle_get(struct fwnode_handle *fwnode);
void fwnode_handle_put(struct fwnode_handle *fwnode);
DEFINE_FREE(fwnode_handle, struct fwnode_handle *, fwnode_handle_put(_T))
int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index);
int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name);
unsigned int device_get_child_node_count(const struct device *dev);
static inline bool device_property_read_bool(const struct device *dev,
const char *propname)
{
return device_property_present(dev, propname);
}
static inline int device_property_read_u8(const 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(const 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(const 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(const struct device *dev,
const char *propname, u64 *val)
{
return device_property_read_u64_array(dev, propname, val, 1);
}
static inline int device_property_count_u8(const struct device *dev, const char *propname)
{
return device_property_read_u8_array(dev, propname, NULL, 0);
}
static inline int device_property_count_u16(const struct device *dev, const char *propname)
{
return device_property_read_u16_array(dev, propname, NULL, 0);
}
static inline int device_property_count_u32(const struct device *dev, const char *propname)
{
return device_property_read_u32_array(dev, propname, NULL, 0);
}
static inline int device_property_count_u64(const struct device *dev, const char *propname)
{
return device_property_read_u64_array(dev, propname, NULL, 0);
}
static inline int device_property_string_array_count(const struct device *dev,
const char *propname)
{
return device_property_read_string_array(dev, propname, NULL, 0);
}
static inline bool fwnode_property_read_bool(const struct fwnode_handle *fwnode,
const char *propname)
{
return fwnode_property_present(fwnode, propname);
}
static inline int fwnode_property_read_u8(const 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(const 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(const 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(const struct fwnode_handle *fwnode,
const char *propname, u64 *val)
{
return fwnode_property_read_u64_array(fwnode, propname, val, 1);
}
static inline int fwnode_property_count_u8(const struct fwnode_handle *fwnode,
const char *propname)
{
return fwnode_property_read_u8_array(fwnode, propname, NULL, 0);
}
static inline int fwnode_property_count_u16(const struct fwnode_handle *fwnode,
const char *propname)
{
return fwnode_property_read_u16_array(fwnode, propname, NULL, 0);
}
static inline int fwnode_property_count_u32(const struct fwnode_handle *fwnode,
const char *propname)
{
return fwnode_property_read_u32_array(fwnode, propname, NULL, 0);
}
static inline int fwnode_property_count_u64(const struct fwnode_handle *fwnode,
const char *propname)
{
return fwnode_property_read_u64_array(fwnode, propname, NULL, 0);
}
static inline int
fwnode_property_string_array_count(const struct fwnode_handle *fwnode,
const char *propname)
{
return fwnode_property_read_string_array(fwnode, propname, NULL, 0);
}
struct software_node;
/**
* struct software_node_ref_args - Reference property with additional arguments
* @node: Reference to a software node
* @nargs: Number of elements in @args array
* @args: Integer arguments
*/
struct software_node_ref_args {
const struct software_node *node;
unsigned int nargs;
u64 args[NR_FWNODE_REFERENCE_ARGS];
};
#define SOFTWARE_NODE_REFERENCE(_ref_, ...) \
(const struct software_node_ref_args) { \
.node = _ref_, \
.nargs = COUNT_ARGS(__VA_ARGS__), \
.args = { __VA_ARGS__ }, \
}
/**
* struct property_entry - "Built-in" device property representation.
* @name: Name of the property.
* @length: Length of data making up the value.
* @is_inline: True when the property value is stored inline.
* @type: Type of the data in unions.
* @pointer: Pointer to the property when it is not stored inline.
* @value: Value of the property when it is stored inline.
*/
struct property_entry {
const char *name;
size_t length;
bool is_inline;
enum dev_prop_type type;
union {
const void *pointer;
union {
u8 u8_data[sizeof(u64) / sizeof(u8)];
u16 u16_data[sizeof(u64) / sizeof(u16)];
u32 u32_data[sizeof(u64) / sizeof(u32)];
u64 u64_data[sizeof(u64) / sizeof(u64)];
const char *str[sizeof(u64) / sizeof(char *)];
} value;
};
};
/*
* Note: the below 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_ARRAY_LEN(_name_, _elem_, _Type_, _val_, _len_) \
(struct property_entry) { \
.name = _name_, \
.length = (_len_) * sizeof_field(struct property_entry, value._elem_[0]), \
.type = DEV_PROP_##_Type_, \
{ .pointer = _val_ }, \
}
#define PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, _len_) \
__PROPERTY_ENTRY_ARRAY_LEN(_name_, u8_data, U8, _val_, _len_)
#define PROPERTY_ENTRY_U16_ARRAY_LEN(_name_, _val_, _len_) \
__PROPERTY_ENTRY_ARRAY_LEN(_name_, u16_data, U16, _val_, _len_)
#define PROPERTY_ENTRY_U32_ARRAY_LEN(_name_, _val_, _len_) \
__PROPERTY_ENTRY_ARRAY_LEN(_name_, u32_data, U32, _val_, _len_)
#define PROPERTY_ENTRY_U64_ARRAY_LEN(_name_, _val_, _len_) \
__PROPERTY_ENTRY_ARRAY_LEN(_name_, u64_data, U64, _val_, _len_)
#define PROPERTY_ENTRY_STRING_ARRAY_LEN(_name_, _val_, _len_) \
__PROPERTY_ENTRY_ARRAY_LEN(_name_, str, STRING, _val_, _len_)
#define PROPERTY_ENTRY_REF_ARRAY_LEN(_name_, _val_, _len_) \
(struct property_entry) { \
.name = _name_, \
.length = (_len_) * sizeof(struct software_node_ref_args), \
.type = DEV_PROP_REF, \
{ .pointer = _val_ }, \
}
#define PROPERTY_ENTRY_U8_ARRAY(_name_, _val_) \
PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
#define PROPERTY_ENTRY_U16_ARRAY(_name_, _val_) \
PROPERTY_ENTRY_U16_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
#define PROPERTY_ENTRY_U32_ARRAY(_name_, _val_) \
PROPERTY_ENTRY_U32_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
#define PROPERTY_ENTRY_U64_ARRAY(_name_, _val_) \
PROPERTY_ENTRY_U64_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
#define PROPERTY_ENTRY_STRING_ARRAY(_name_, _val_) \
PROPERTY_ENTRY_STRING_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
#define PROPERTY_ENTRY_REF_ARRAY(_name_, _val_) \
PROPERTY_ENTRY_REF_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
#define __PROPERTY_ENTRY_ELEMENT(_name_, _elem_, _Type_, _val_) \
(struct property_entry) { \
.name = _name_, \
.length = sizeof_field(struct property_entry, value._elem_[0]), \
.is_inline = true, \
.type = DEV_PROP_##_Type_, \
{ .value = { ._elem_[0] = _val_ } }, \
}
#define PROPERTY_ENTRY_U8(_name_, _val_) \
__PROPERTY_ENTRY_ELEMENT(_name_, u8_data, U8, _val_)
#define PROPERTY_ENTRY_U16(_name_, _val_) \
__PROPERTY_ENTRY_ELEMENT(_name_, u16_data, U16, _val_)
#define PROPERTY_ENTRY_U32(_name_, _val_) \
__PROPERTY_ENTRY_ELEMENT(_name_, u32_data, U32, _val_)
#define PROPERTY_ENTRY_U64(_name_, _val_) \
__PROPERTY_ENTRY_ELEMENT(_name_, u64_data, U64, _val_)
#define PROPERTY_ENTRY_STRING(_name_, _val_) \
__PROPERTY_ENTRY_ELEMENT(_name_, str, STRING, _val_)
#define PROPERTY_ENTRY_REF(_name_, _ref_, ...) \
(struct property_entry) { \
.name = _name_, \
.length = sizeof(struct software_node_ref_args), \
.type = DEV_PROP_REF, \
{ .pointer = &SOFTWARE_NODE_REFERENCE(_ref_, ##__VA_ARGS__), }, \
}
#define PROPERTY_ENTRY_BOOL(_name_) \
(struct property_entry) { \
.name = _name_, \
.is_inline = true, \
}
struct property_entry *
property_entries_dup(const struct property_entry *properties);
void property_entries_free(const struct property_entry *properties);
bool device_dma_supported(const struct device *dev);
enum dev_dma_attr device_get_dma_attr(const struct device *dev);
const void *device_get_match_data(const struct device *dev);
int device_get_phy_mode(struct device *dev);
int fwnode_get_phy_mode(const struct fwnode_handle *fwnode);
void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index);
struct fwnode_handle *fwnode_graph_get_next_endpoint(
const struct fwnode_handle *fwnode, struct fwnode_handle *prev);
struct fwnode_handle *
fwnode_graph_get_port_parent(const struct fwnode_handle *fwnode);
struct fwnode_handle *fwnode_graph_get_remote_port_parent(
const struct fwnode_handle *fwnode);
struct fwnode_handle *fwnode_graph_get_remote_port(
const struct fwnode_handle *fwnode);
struct fwnode_handle *fwnode_graph_get_remote_endpoint(
const struct fwnode_handle *fwnode);
static inline bool fwnode_graph_is_endpoint(const struct fwnode_handle *fwnode)
{
return fwnode_property_present(fwnode, "remote-endpoint");
}
/*
* Fwnode lookup flags
*
* @FWNODE_GRAPH_ENDPOINT_NEXT: In the case of no exact match, look for the
* closest endpoint ID greater than the specified
* one.
* @FWNODE_GRAPH_DEVICE_DISABLED: That the device to which the remote
* endpoint of the given endpoint belongs to,
* may be disabled, or that the endpoint is not
* connected.
*/
#define FWNODE_GRAPH_ENDPOINT_NEXT BIT(0)
#define FWNODE_GRAPH_DEVICE_DISABLED BIT(1)
struct fwnode_handle *
fwnode_graph_get_endpoint_by_id(const struct fwnode_handle *fwnode,
u32 port, u32 endpoint, unsigned long flags);
unsigned int fwnode_graph_get_endpoint_count(const struct fwnode_handle *fwnode,
unsigned long flags);
#define fwnode_graph_for_each_endpoint(fwnode, child) \
for (child = fwnode_graph_get_next_endpoint(fwnode, NULL); child; \
child = fwnode_graph_get_next_endpoint(fwnode, child))
int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
struct fwnode_endpoint *endpoint);
typedef void *(*devcon_match_fn_t)(const struct fwnode_handle *fwnode, const char *id,
void *data);
void *fwnode_connection_find_match(const struct fwnode_handle *fwnode,
const char *con_id, void *data,
devcon_match_fn_t match);
static inline void *device_connection_find_match(const struct device *dev,
const char *con_id, void *data,
devcon_match_fn_t match)
{
return fwnode_connection_find_match(dev_fwnode(dev), con_id, data, match);
}
int fwnode_connection_find_matches(const struct fwnode_handle *fwnode,
const char *con_id, void *data,
devcon_match_fn_t match,
void **matches, unsigned int matches_len);
/* -------------------------------------------------------------------------- */
/* Software fwnode support - when HW description is incomplete or missing */
/**
* struct software_node - Software node description
* @name: Name of the software node
* @parent: Parent of the software node
* @properties: Array of device properties
*/
struct software_node {
const char *name;
const struct software_node *parent;
const struct property_entry *properties;
};
#define SOFTWARE_NODE(_name_, _properties_, _parent_) \
(struct software_node) { \
.name = _name_, \
.properties = _properties_, \
.parent = _parent_, \
}
bool is_software_node(const struct fwnode_handle *fwnode);
const struct software_node *
to_software_node(const struct fwnode_handle *fwnode);
struct fwnode_handle *software_node_fwnode(const struct software_node *node);
const struct software_node *
software_node_find_by_name(const struct software_node *parent,
const char *name);
int software_node_register_node_group(const struct software_node **node_group);
void software_node_unregister_node_group(const struct software_node **node_group);
int software_node_register(const struct software_node *node);
void software_node_unregister(const struct software_node *node);
struct fwnode_handle *
fwnode_create_software_node(const struct property_entry *properties,
const struct fwnode_handle *parent);
void fwnode_remove_software_node(struct fwnode_handle *fwnode);
int device_add_software_node(struct device *dev, const struct software_node *node);
void device_remove_software_node(struct device *dev);
int device_create_managed_software_node(struct device *dev,
const struct property_entry *properties,
const struct software_node *parent);
#endif /* _LINUX_PROPERTY_H_ */
|