186 lines
6.9 KiB
C
186 lines
6.9 KiB
C
/*
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* property.c - 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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#include <linux/property.h>
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#include <linux/export.h>
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#include <linux/acpi.h>
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#include <linux/of.h>
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/**
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* device_property_present - check if a property of a device is present
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* @dev: Device whose property is being checked
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* @propname: Name of the property
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*
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* Check if property @propname is present in the device firmware description.
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*/
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bool device_property_present(struct device *dev, const char *propname)
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{
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if (IS_ENABLED(CONFIG_OF) && dev->of_node)
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return of_property_read_bool(dev->of_node, propname);
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return !acpi_dev_prop_get(ACPI_COMPANION(dev), propname, NULL);
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}
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EXPORT_SYMBOL_GPL(device_property_present);
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#define OF_DEV_PROP_READ_ARRAY(node, propname, type, val, nval) \
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(val) ? of_property_read_##type##_array((node), (propname), (val), (nval)) \
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: of_property_count_elems_of_size((node), (propname), sizeof(type))
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#define DEV_PROP_READ_ARRAY(_dev_, _propname_, _type_, _proptype_, _val_, _nval_) \
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IS_ENABLED(CONFIG_OF) && _dev_->of_node ? \
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(OF_DEV_PROP_READ_ARRAY(_dev_->of_node, _propname_, _type_, \
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_val_, _nval_)) : \
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acpi_dev_prop_read(ACPI_COMPANION(_dev_), _propname_, \
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_proptype_, _val_, _nval_)
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/**
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* device_property_read_u8_array - return a u8 array property of a device
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* @dev: Device to get the property of
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* @propname: Name of the property
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* @val: The values are stored here
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* @nval: Size of the @val array
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*
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* Function reads an array of u8 properties with @propname from the device
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* firmware description and stores them to @val if found.
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*
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* Return: %0 if the property was found (success),
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* %-EINVAL if given arguments are not valid,
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* %-ENODATA if the property does not have a value,
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* %-EPROTO if the property is not an array of numbers,
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* %-EOVERFLOW if the size of the property is not as expected.
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*/
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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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{
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return DEV_PROP_READ_ARRAY(dev, propname, u8, DEV_PROP_U8, val, nval);
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}
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EXPORT_SYMBOL_GPL(device_property_read_u8_array);
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/**
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* device_property_read_u16_array - return a u16 array property of a device
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* @dev: Device to get the property of
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* @propname: Name of the property
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* @val: The values are stored here
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* @nval: Size of the @val array
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*
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* Function reads an array of u16 properties with @propname from the device
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* firmware description and stores them to @val if found.
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*
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* Return: %0 if the property was found (success),
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* %-EINVAL if given arguments are not valid,
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* %-ENODATA if the property does not have a value,
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* %-EPROTO if the property is not an array of numbers,
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* %-EOVERFLOW if the size of the property is not as expected.
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*/
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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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{
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return DEV_PROP_READ_ARRAY(dev, propname, u16, DEV_PROP_U16, val, nval);
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}
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EXPORT_SYMBOL_GPL(device_property_read_u16_array);
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/**
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* device_property_read_u32_array - return a u32 array property of a device
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* @dev: Device to get the property of
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* @propname: Name of the property
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* @val: The values are stored here
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* @nval: Size of the @val array
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*
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* Function reads an array of u32 properties with @propname from the device
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* firmware description and stores them to @val if found.
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*
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* Return: %0 if the property was found (success),
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* %-EINVAL if given arguments are not valid,
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* %-ENODATA if the property does not have a value,
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* %-EPROTO if the property is not an array of numbers,
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* %-EOVERFLOW if the size of the property is not as expected.
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*/
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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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{
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return DEV_PROP_READ_ARRAY(dev, propname, u32, DEV_PROP_U32, val, nval);
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}
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EXPORT_SYMBOL_GPL(device_property_read_u32_array);
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/**
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* device_property_read_u64_array - return a u64 array property of a device
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* @dev: Device to get the property of
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* @propname: Name of the property
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* @val: The values are stored here
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* @nval: Size of the @val array
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*
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* Function reads an array of u64 properties with @propname from the device
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* firmware description and stores them to @val if found.
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*
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* Return: %0 if the property was found (success),
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* %-EINVAL if given arguments are not valid,
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* %-ENODATA if the property does not have a value,
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* %-EPROTO if the property is not an array of numbers,
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* %-EOVERFLOW if the size of the property is not as expected.
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*/
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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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{
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return DEV_PROP_READ_ARRAY(dev, propname, u64, DEV_PROP_U64, val, nval);
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}
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EXPORT_SYMBOL_GPL(device_property_read_u64_array);
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/**
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* device_property_read_string_array - return a string array property of device
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* @dev: Device to get the property of
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* @propname: Name of the property
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* @val: The values are stored here
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* @nval: Size of the @val array
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*
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* Function reads an array of string properties with @propname from the device
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* firmware description and stores them to @val if found.
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*
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* Return: %0 if the property was found (success),
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* %-EINVAL if given arguments are not valid,
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* %-ENODATA if the property does not have a value,
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* %-EPROTO or %-EILSEQ if the property is not an array of strings,
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* %-EOVERFLOW if the size of the property is not as expected.
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*/
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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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{
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return IS_ENABLED(CONFIG_OF) && dev->of_node ?
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of_property_read_string_array(dev->of_node, propname, val, nval) :
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acpi_dev_prop_read(ACPI_COMPANION(dev), propname,
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DEV_PROP_STRING, val, nval);
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}
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EXPORT_SYMBOL_GPL(device_property_read_string_array);
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/**
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* device_property_read_string - return a string property of a device
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* @dev: Device to get the property of
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* @propname: Name of the property
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* @val: The value is stored here
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*
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* Function reads property @propname from the device firmware description and
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* stores the value into @val if found. The value is checked to be a string.
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*
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* Return: %0 if the property was found (success),
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* %-EINVAL if given arguments are not valid,
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* %-ENODATA if the property does not have a value,
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* %-EPROTO or %-EILSEQ if the property type is not a string.
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*/
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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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{
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return IS_ENABLED(CONFIG_OF) && dev->of_node ?
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of_property_read_string(dev->of_node, propname, val) :
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acpi_dev_prop_read(ACPI_COMPANION(dev), propname,
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DEV_PROP_STRING, val, 1);
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}
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EXPORT_SYMBOL_GPL(device_property_read_string);
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