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![Rafael J. Wysocki](/assets/img/avatar_default.png)
Introduce data structures and code allowing "built-in" properties to be associated with devices in such a way that they will be used by the device_property_* API if no proper firmware node (neither DT nor ACPI) is present for the given device. Each property is to be represented by a property_entry structure. An array of property_entry structures (terminated with a null entry) can be pointed to by the properties field of struct property_set that can be added as a firmware node to a struct device using device_add_property_set(). That will cause the device_property_* API to use that property_set as the source of properties if the given device does not have a DT node or an ACPI companion device object associated with it. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Tested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
167 lines
5.1 KiB
C
167 lines
5.1 KiB
C
/*
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* property.h - Unified device property interface.
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*
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* Copyright (C) 2014, Intel Corporation
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* Authors: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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* Mika Westerberg <mika.westerberg@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _LINUX_PROPERTY_H_
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#define _LINUX_PROPERTY_H_
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#include <linux/fwnode.h>
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#include <linux/types.h>
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struct device;
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enum dev_prop_type {
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DEV_PROP_U8,
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DEV_PROP_U16,
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DEV_PROP_U32,
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DEV_PROP_U64,
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DEV_PROP_STRING,
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DEV_PROP_MAX,
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};
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bool device_property_present(struct device *dev, const char *propname);
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int device_property_read_u8_array(struct device *dev, const char *propname,
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u8 *val, size_t nval);
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int device_property_read_u16_array(struct device *dev, const char *propname,
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u16 *val, size_t nval);
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int device_property_read_u32_array(struct device *dev, const char *propname,
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u32 *val, size_t nval);
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int device_property_read_u64_array(struct device *dev, const char *propname,
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u64 *val, size_t nval);
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int device_property_read_string_array(struct device *dev, const char *propname,
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const char **val, size_t nval);
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int device_property_read_string(struct device *dev, const char *propname,
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const char **val);
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bool fwnode_property_present(struct fwnode_handle *fwnode, const char *propname);
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int fwnode_property_read_u8_array(struct fwnode_handle *fwnode,
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const char *propname, u8 *val,
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size_t nval);
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int fwnode_property_read_u16_array(struct fwnode_handle *fwnode,
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const char *propname, u16 *val,
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size_t nval);
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int fwnode_property_read_u32_array(struct fwnode_handle *fwnode,
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const char *propname, u32 *val,
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size_t nval);
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int fwnode_property_read_u64_array(struct fwnode_handle *fwnode,
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const char *propname, u64 *val,
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size_t nval);
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int fwnode_property_read_string_array(struct fwnode_handle *fwnode,
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const char *propname, const char **val,
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size_t nval);
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int fwnode_property_read_string(struct fwnode_handle *fwnode,
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const char *propname, const char **val);
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struct fwnode_handle *device_get_next_child_node(struct device *dev,
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struct fwnode_handle *child);
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#define device_for_each_child_node(dev, child) \
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for (child = device_get_next_child_node(dev, NULL); child; \
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child = device_get_next_child_node(dev, child))
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void fwnode_handle_put(struct fwnode_handle *fwnode);
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unsigned int device_get_child_node_count(struct device *dev);
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static inline bool device_property_read_bool(struct device *dev,
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const char *propname)
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{
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return device_property_present(dev, propname);
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}
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static inline int device_property_read_u8(struct device *dev,
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const char *propname, u8 *val)
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{
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return device_property_read_u8_array(dev, propname, val, 1);
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}
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static inline int device_property_read_u16(struct device *dev,
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const char *propname, u16 *val)
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{
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return device_property_read_u16_array(dev, propname, val, 1);
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}
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static inline int device_property_read_u32(struct device *dev,
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const char *propname, u32 *val)
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{
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return device_property_read_u32_array(dev, propname, val, 1);
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}
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static inline int device_property_read_u64(struct device *dev,
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const char *propname, u64 *val)
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{
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return device_property_read_u64_array(dev, propname, val, 1);
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}
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static inline bool fwnode_property_read_bool(struct fwnode_handle *fwnode,
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const char *propname)
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{
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return fwnode_property_present(fwnode, propname);
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}
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static inline int fwnode_property_read_u8(struct fwnode_handle *fwnode,
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const char *propname, u8 *val)
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{
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return fwnode_property_read_u8_array(fwnode, propname, val, 1);
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}
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static inline int fwnode_property_read_u16(struct fwnode_handle *fwnode,
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const char *propname, u16 *val)
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{
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return fwnode_property_read_u16_array(fwnode, propname, val, 1);
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}
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static inline int fwnode_property_read_u32(struct fwnode_handle *fwnode,
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const char *propname, u32 *val)
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{
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return fwnode_property_read_u32_array(fwnode, propname, val, 1);
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}
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static inline int fwnode_property_read_u64(struct fwnode_handle *fwnode,
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const char *propname, u64 *val)
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{
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return fwnode_property_read_u64_array(fwnode, propname, val, 1);
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}
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/**
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* struct property_entry - "Built-in" device property representation.
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* @name: Name of the property.
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* @type: Type of the property.
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* @nval: Number of items of type @type making up the value.
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* @value: Value of the property (an array of @nval items of type @type).
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*/
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struct property_entry {
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const char *name;
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enum dev_prop_type type;
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size_t nval;
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union {
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void *raw_data;
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u8 *u8_data;
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u16 *u16_data;
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u32 *u32_data;
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u64 *u64_data;
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const char **str;
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} value;
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};
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/**
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* struct property_set - Collection of "built-in" device properties.
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* @fwnode: Handle to be pointed to by the fwnode field of struct device.
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* @properties: Array of properties terminated with a null entry.
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*/
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struct property_set {
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struct fwnode_handle fwnode;
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struct property_entry *properties;
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};
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void device_add_property_set(struct device *dev, struct property_set *pset);
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#endif /* _LINUX_PROPERTY_H_ */
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