gro: Allow tunnel stacking in the case of FOU/GUE

[linux/fpc-iii.git] / drivers / base / property.c

/*
 * property.c - 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.
 */

#include <linux/acpi.h>
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/property.h>

/**
 * device_add_property_set - Add a collection of properties to a device object.
 * @dev: Device to add properties to.
 * @pset: Collection of properties to add.
 *
 * Associate a collection of device properties represented by @pset with @dev
 * as its secondary firmware node.
 */
void device_add_property_set(struct device *dev, struct property_set *pset)
{
        if (!pset)
                return;

        pset->fwnode.type = FWNODE_PDATA;
        set_secondary_fwnode(dev, &pset->fwnode);
}
EXPORT_SYMBOL_GPL(device_add_property_set);

static inline bool is_pset(struct fwnode_handle *fwnode)
{
        return fwnode && fwnode->type == FWNODE_PDATA;
}

static inline struct property_set *to_pset(struct fwnode_handle *fwnode)
{
        return is_pset(fwnode) ?
                container_of(fwnode, struct property_set, fwnode) : NULL;
}

static struct property_entry *pset_prop_get(struct property_set *pset,
                                            const char *name)
{
        struct property_entry *prop;

        if (!pset || !pset->properties)
                return NULL;

        for (prop = pset->properties; prop->name; prop++)
                if (!strcmp(name, prop->name))
                        return prop;

        return NULL;
}

static int pset_prop_read_array(struct property_set *pset, const char *name,
                                enum dev_prop_type type, void *val, size_t nval)
{
        struct property_entry *prop;
        unsigned int item_size;

        prop = pset_prop_get(pset, name);
        if (!prop)
                return -ENODATA;

        if (prop->type != type)
                return -EPROTO;

        if (!val)
                return prop->nval;

        if (prop->nval < nval)
                return -EOVERFLOW;

        switch (type) {
        case DEV_PROP_U8:
                item_size = sizeof(u8);
                break;
        case DEV_PROP_U16:
                item_size = sizeof(u16);
                break;
        case DEV_PROP_U32:
                item_size = sizeof(u32);
                break;
        case DEV_PROP_U64:
                item_size = sizeof(u64);
                break;
        case DEV_PROP_STRING:
                item_size = sizeof(const char *);
                break;
        default:
                return -EINVAL;
        }
        memcpy(val, prop->value.raw_data, nval * item_size);
        return 0;
}

static inline struct fwnode_handle *dev_fwnode(struct device *dev)
{
        return IS_ENABLED(CONFIG_OF) && dev->of_node ?
                &dev->of_node->fwnode : dev->fwnode;
}

/**
 * device_property_present - check if a property of a device is present
 * @dev: Device whose property is being checked
 * @propname: Name of the property
 *
 * Check if property @propname is present in the device firmware description.
 */
bool device_property_present(struct device *dev, const char *propname)
{
        return fwnode_property_present(dev_fwnode(dev), propname);
}
EXPORT_SYMBOL_GPL(device_property_present);

/**
 * fwnode_property_present - check if a property of a firmware node is present
 * @fwnode: Firmware node whose property to check
 * @propname: Name of the property
 */
bool fwnode_property_present(struct fwnode_handle *fwnode, const char *propname)
{
        if (is_of_node(fwnode))
                return of_property_read_bool(of_node(fwnode), propname);
        else if (is_acpi_node(fwnode))
                return !acpi_dev_prop_get(acpi_node(fwnode), propname, NULL);

        return !!pset_prop_get(to_pset(fwnode), propname);
}
EXPORT_SYMBOL_GPL(fwnode_property_present);

/**
 * device_property_read_u8_array - return a u8 array property of a device
 * @dev: Device to get the property of
 * @propname: Name of the property
 * @val: The values are stored here or %NULL to return the number of values
 * @nval: Size of the @val array
 *
 * Function reads an array of u8 properties with @propname from the device
 * firmware description and stores them to @val if found.
 *
 * Return: number of values if @val was %NULL,
 *         %0 if the property was found (success),
 *         %-EINVAL if given arguments are not valid,
 *         %-ENODATA if the property does not have a value,
 *         %-EPROTO if the property is not an array of numbers,
 *         %-EOVERFLOW if the size of the property is not as expected.
 */
int device_property_read_u8_array(struct device *dev, const char *propname,
                                  u8 *val, size_t nval)
{
        return fwnode_property_read_u8_array(dev_fwnode(dev), propname, val, nval);
}
EXPORT_SYMBOL_GPL(device_property_read_u8_array);

/**
 * device_property_read_u16_array - return a u16 array property of a device
 * @dev: Device to get the property of
 * @propname: Name of the property
 * @val: The values are stored here or %NULL to return the number of values
 * @nval: Size of the @val array
 *
 * Function reads an array of u16 properties with @propname from the device
 * firmware description and stores them to @val if found.
 *
 * Return: number of values if @val was %NULL,
 *         %0 if the property was found (success),
 *         %-EINVAL if given arguments are not valid,
 *         %-ENODATA if the property does not have a value,
 *         %-EPROTO if the property is not an array of numbers,
 *         %-EOVERFLOW if the size of the property is not as expected.
 */
int device_property_read_u16_array(struct device *dev, const char *propname,
                                   u16 *val, size_t nval)
{
        return fwnode_property_read_u16_array(dev_fwnode(dev), propname, val, nval);
}
EXPORT_SYMBOL_GPL(device_property_read_u16_array);

/**
 * device_property_read_u32_array - return a u32 array property of a device
 * @dev: Device to get the property of
 * @propname: Name of the property
 * @val: The values are stored here or %NULL to return the number of values
 * @nval: Size of the @val array
 *
 * Function reads an array of u32 properties with @propname from the device
 * firmware description and stores them to @val if found.
 *
 * Return: number of values if @val was %NULL,
 *         %0 if the property was found (success),
 *         %-EINVAL if given arguments are not valid,
 *         %-ENODATA if the property does not have a value,
 *         %-EPROTO if the property is not an array of numbers,
 *         %-EOVERFLOW if the size of the property is not as expected.
 */
int device_property_read_u32_array(struct device *dev, const char *propname,
                                   u32 *val, size_t nval)
{
        return fwnode_property_read_u32_array(dev_fwnode(dev), propname, val, nval);
}
EXPORT_SYMBOL_GPL(device_property_read_u32_array);

/**
 * device_property_read_u64_array - return a u64 array property of a device
 * @dev: Device to get the property of
 * @propname: Name of the property
 * @val: The values are stored here or %NULL to return the number of values
 * @nval: Size of the @val array
 *
 * Function reads an array of u64 properties with @propname from the device
 * firmware description and stores them to @val if found.
 *
 * Return: number of values if @val was %NULL,
 *         %0 if the property was found (success),
 *         %-EINVAL if given arguments are not valid,
 *         %-ENODATA if the property does not have a value,
 *         %-EPROTO if the property is not an array of numbers,
 *         %-EOVERFLOW if the size of the property is not as expected.
 */
int device_property_read_u64_array(struct device *dev, const char *propname,
                                   u64 *val, size_t nval)
{
        return fwnode_property_read_u64_array(dev_fwnode(dev), propname, val, nval);
}
EXPORT_SYMBOL_GPL(device_property_read_u64_array);

/**
 * device_property_read_string_array - return a string array property of device
 * @dev: Device to get the property of
 * @propname: Name of the property
 * @val: The values are stored here or %NULL to return the number of values
 * @nval: Size of the @val array
 *
 * Function reads an array of string properties with @propname from the device
 * firmware description and stores them to @val if found.
 *
 * Return: number of values if @val was %NULL,
 *         %0 if the property was found (success),
 *         %-EINVAL if given arguments are not valid,
 *         %-ENODATA if the property does not have a value,
 *         %-EPROTO or %-EILSEQ if the property is not an array of strings,
 *         %-EOVERFLOW if the size of the property is not as expected.
 */
int device_property_read_string_array(struct device *dev, const char *propname,
                                      const char **val, size_t nval)
{
        return fwnode_property_read_string_array(dev_fwnode(dev), propname, val, nval);
}
EXPORT_SYMBOL_GPL(device_property_read_string_array);

/**
 * device_property_read_string - return a string property of a device
 * @dev: Device to get the property of
 * @propname: Name of the property
 * @val: The value is stored here
 *
 * Function reads property @propname from the device firmware description and
 * stores the value into @val if found. The value is checked to be a string.
 *
 * Return: %0 if the property was found (success),
 *         %-EINVAL if given arguments are not valid,
 *         %-ENODATA if the property does not have a value,
 *         %-EPROTO or %-EILSEQ if the property type is not a string.
 */
int device_property_read_string(struct device *dev, const char *propname,
                                const char **val)
{
        return fwnode_property_read_string(dev_fwnode(dev), propname, val);
}
EXPORT_SYMBOL_GPL(device_property_read_string);

#define OF_DEV_PROP_READ_ARRAY(node, propname, type, val, nval) \
        (val) ? of_property_read_##type##_array((node), (propname), (val), (nval)) \
              : of_property_count_elems_of_size((node), (propname), sizeof(type))

#define FWNODE_PROP_READ_ARRAY(_fwnode_, _propname_, _type_, _proptype_, _val_, _nval_) \
({ \
        int _ret_; \
        if (is_of_node(_fwnode_)) \
                _ret_ = OF_DEV_PROP_READ_ARRAY(of_node(_fwnode_), _propname_, \
                                               _type_, _val_, _nval_); \
        else if (is_acpi_node(_fwnode_)) \
                _ret_ = acpi_dev_prop_read(acpi_node(_fwnode_), _propname_, \
                                           _proptype_, _val_, _nval_); \
        else \
                _ret_ = pset_prop_read_array(to_pset(_fwnode_), _propname_, \
                                             _proptype_, _val_, _nval_); \
        _ret_; \
})

/**
 * fwnode_property_read_u8_array - return a u8 array property of firmware node
 * @fwnode: Firmware node to get the property of
 * @propname: Name of the property
 * @val: The values are stored here or %NULL to return the number of values
 * @nval: Size of the @val array
 *
 * Read an array of u8 properties with @propname from @fwnode and stores them to
 * @val if found.
 *
 * Return: number of values if @val was %NULL,
 *         %0 if the property was found (success),
 *         %-EINVAL if given arguments are not valid,
 *         %-ENODATA if the property does not have a value,
 *         %-EPROTO if the property is not an array of numbers,
 *         %-EOVERFLOW if the size of the property is not as expected,
 *         %-ENXIO if no suitable firmware interface is present.
 */
int fwnode_property_read_u8_array(struct fwnode_handle *fwnode,
                                  const char *propname, u8 *val, size_t nval)
{
        return FWNODE_PROP_READ_ARRAY(fwnode, propname, u8, DEV_PROP_U8,
                                      val, nval);
}
EXPORT_SYMBOL_GPL(fwnode_property_read_u8_array);

/**
 * fwnode_property_read_u16_array - return a u16 array property of firmware node
 * @fwnode: Firmware node to get the property of
 * @propname: Name of the property
 * @val: The values are stored here or %NULL to return the number of values
 * @nval: Size of the @val array
 *
 * Read an array of u16 properties with @propname from @fwnode and store them to
 * @val if found.
 *
 * Return: number of values if @val was %NULL,
 *         %0 if the property was found (success),
 *         %-EINVAL if given arguments are not valid,
 *         %-ENODATA if the property does not have a value,
 *         %-EPROTO if the property is not an array of numbers,
 *         %-EOVERFLOW if the size of the property is not as expected,
 *         %-ENXIO if no suitable firmware interface is present.
 */
int fwnode_property_read_u16_array(struct fwnode_handle *fwnode,
                                   const char *propname, u16 *val, size_t nval)
{
        return FWNODE_PROP_READ_ARRAY(fwnode, propname, u16, DEV_PROP_U16,
                                      val, nval);
}
EXPORT_SYMBOL_GPL(fwnode_property_read_u16_array);

/**
 * fwnode_property_read_u32_array - return a u32 array property of firmware node
 * @fwnode: Firmware node to get the property of
 * @propname: Name of the property
 * @val: The values are stored here or %NULL to return the number of values
 * @nval: Size of the @val array
 *
 * Read an array of u32 properties with @propname from @fwnode store them to
 * @val if found.
 *
 * Return: number of values if @val was %NULL,
 *         %0 if the property was found (success),
 *         %-EINVAL if given arguments are not valid,
 *         %-ENODATA if the property does not have a value,
 *         %-EPROTO if the property is not an array of numbers,
 *         %-EOVERFLOW if the size of the property is not as expected,
 *         %-ENXIO if no suitable firmware interface is present.
 */
int fwnode_property_read_u32_array(struct fwnode_handle *fwnode,
                                   const char *propname, u32 *val, size_t nval)
{
        return FWNODE_PROP_READ_ARRAY(fwnode, propname, u32, DEV_PROP_U32,
                                      val, nval);
}
EXPORT_SYMBOL_GPL(fwnode_property_read_u32_array);

/**
 * fwnode_property_read_u64_array - return a u64 array property firmware node
 * @fwnode: Firmware node to get the property of
 * @propname: Name of the property
 * @val: The values are stored here or %NULL to return the number of values
 * @nval: Size of the @val array
 *
 * Read an array of u64 properties with @propname from @fwnode and store them to
 * @val if found.
 *
 * Return: number of values if @val was %NULL,
 *         %0 if the property was found (success),
 *         %-EINVAL if given arguments are not valid,
 *         %-ENODATA if the property does not have a value,
 *         %-EPROTO if the property is not an array of numbers,
 *         %-EOVERFLOW if the size of the property is not as expected,
 *         %-ENXIO if no suitable firmware interface is present.
 */
int fwnode_property_read_u64_array(struct fwnode_handle *fwnode,
                                   const char *propname, u64 *val, size_t nval)
{
        return FWNODE_PROP_READ_ARRAY(fwnode, propname, u64, DEV_PROP_U64,
                                      val, nval);
}
EXPORT_SYMBOL_GPL(fwnode_property_read_u64_array);

/**
 * fwnode_property_read_string_array - return string array property of a node
 * @fwnode: Firmware node to get the property of
 * @propname: Name of the property
 * @val: The values are stored here or %NULL to return the number of values
 * @nval: Size of the @val array
 *
 * Read an string list property @propname from the given firmware node and store
 * them to @val if found.
 *
 * Return: number of values if @val was %NULL,
 *         %0 if the property was found (success),
 *         %-EINVAL if given arguments are not valid,
 *         %-ENODATA if the property does not have a value,
 *         %-EPROTO if the property is not an array of strings,
 *         %-EOVERFLOW if the size of the property is not as expected,
 *         %-ENXIO if no suitable firmware interface is present.
 */
int fwnode_property_read_string_array(struct fwnode_handle *fwnode,
                                      const char *propname, const char **val,
                                      size_t nval)
{
        if (is_of_node(fwnode))
                return val ?
                        of_property_read_string_array(of_node(fwnode), propname,
                                                      val, nval) :
                        of_property_count_strings(of_node(fwnode), propname);
        else if (is_acpi_node(fwnode))
                return acpi_dev_prop_read(acpi_node(fwnode), propname,
                                          DEV_PROP_STRING, val, nval);

        return pset_prop_read_array(to_pset(fwnode), propname,
                                    DEV_PROP_STRING, val, nval);
}
EXPORT_SYMBOL_GPL(fwnode_property_read_string_array);

/**
 * fwnode_property_read_string - return a string property of a firmware node
 * @fwnode: Firmware node to get the property of
 * @propname: Name of the property
 * @val: The value is stored here
 *
 * Read property @propname from the given firmware node and store the value into
 * @val if found.  The value is checked to be a string.
 *
 * Return: %0 if the property was found (success),
 *         %-EINVAL if given arguments are not valid,
 *         %-ENODATA if the property does not have a value,
 *         %-EPROTO or %-EILSEQ if the property is not a string,
 *         %-ENXIO if no suitable firmware interface is present.
 */
int fwnode_property_read_string(struct fwnode_handle *fwnode,
                                const char *propname, const char **val)
{
        if (is_of_node(fwnode))
                return of_property_read_string(of_node(fwnode), propname, val);
        else if (is_acpi_node(fwnode))
                return acpi_dev_prop_read(acpi_node(fwnode), propname,
                                          DEV_PROP_STRING, val, 1);

        return -ENXIO;
}
EXPORT_SYMBOL_GPL(fwnode_property_read_string);

/**
 * device_get_next_child_node - Return the next child node handle for a device
 * @dev: Device to find the next child node for.
 * @child: Handle to one of the device's child nodes or a null handle.
 */
struct fwnode_handle *device_get_next_child_node(struct device *dev,
                                                 struct fwnode_handle *child)
{
        if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
                struct device_node *node;

                node = of_get_next_available_child(dev->of_node, of_node(child));
                if (node)
                        return &node->fwnode;
        } else if (IS_ENABLED(CONFIG_ACPI)) {
                struct acpi_device *node;

                node = acpi_get_next_child(dev, acpi_node(child));
                if (node)
                        return acpi_fwnode_handle(node);
        }
        return NULL;
}
EXPORT_SYMBOL_GPL(device_get_next_child_node);

/**
 * fwnode_handle_put - Drop reference to a device node
 * @fwnode: Pointer to the device node to drop the reference to.
 *
 * This has to be used when terminating device_for_each_child_node() iteration
 * with break or return to prevent stale device node references from being left
 * behind.
 */
void fwnode_handle_put(struct fwnode_handle *fwnode)
{
        if (is_of_node(fwnode))
                of_node_put(of_node(fwnode));
}
EXPORT_SYMBOL_GPL(fwnode_handle_put);

/**
 * device_get_child_node_count - return the number of child nodes for device
 * @dev: Device to cound the child nodes for
 */
unsigned int device_get_child_node_count(struct device *dev)
{
        struct fwnode_handle *child;
        unsigned int count = 0;

        device_for_each_child_node(dev, child)
                count++;

        return count;
}
EXPORT_SYMBOL_GPL(device_get_child_node_count);