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/*
* 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/property.h>
#include <linux/export.h>
#include <linux/acpi.h>
#include <linux/of.h>
/**
* 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)
{
if (IS_ENABLED(CONFIG_OF) && dev->of_node)
return of_property_read_bool(dev->of_node, propname);
return !acpi_dev_prop_get(ACPI_COMPANION(dev), propname, NULL);
}
EXPORT_SYMBOL_GPL(device_property_present);
#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 DEV_PROP_READ_ARRAY(_dev_, _propname_, _type_, _proptype_, _val_, _nval_) \
IS_ENABLED(CONFIG_OF) && _dev_->of_node ? \
(OF_DEV_PROP_READ_ARRAY(_dev_->of_node, _propname_, _type_, \
_val_, _nval_)) : \
acpi_dev_prop_read(ACPI_COMPANION(_dev_), _propname_, \
_proptype_, _val_, _nval_)
/**
* 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
* @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: %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 DEV_PROP_READ_ARRAY(dev, propname, u8, DEV_PROP_U8, 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
* @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: %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 DEV_PROP_READ_ARRAY(dev, propname, u16, DEV_PROP_U16, 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
* @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: %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 DEV_PROP_READ_ARRAY(dev, propname, u32, DEV_PROP_U32, 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
* @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: %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 DEV_PROP_READ_ARRAY(dev, propname, u64, DEV_PROP_U64, 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
* @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: %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 IS_ENABLED(CONFIG_OF) && dev->of_node ?
of_property_read_string_array(dev->of_node, propname, val, nval) :
acpi_dev_prop_read(ACPI_COMPANION(dev), propname,
DEV_PROP_STRING, 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 IS_ENABLED(CONFIG_OF) && dev->of_node ?
of_property_read_string(dev->of_node, propname, val) :
acpi_dev_prop_read(ACPI_COMPANION(dev), propname,
DEV_PROP_STRING, val, 1);
}
EXPORT_SYMBOL_GPL(device_property_read_string);
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