432 lines
15 KiB
C
432 lines
15 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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/**
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* fwnode_property_present - check if a property of a firmware node is present
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* @fwnode: Firmware node whose property to check
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* @propname: Name of the property
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*/
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bool fwnode_property_present(struct fwnode_handle *fwnode, const char *propname)
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{
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if (is_of_node(fwnode))
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return of_property_read_bool(of_node(fwnode), propname);
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else if (is_acpi_node(fwnode))
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return !acpi_dev_prop_get(acpi_node(fwnode), propname, NULL);
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return false;
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}
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EXPORT_SYMBOL_GPL(fwnode_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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#define FWNODE_PROP_READ_ARRAY(_fwnode_, _propname_, _type_, _proptype_, _val_, _nval_) \
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({ \
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int _ret_; \
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if (is_of_node(_fwnode_)) \
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_ret_ = OF_DEV_PROP_READ_ARRAY(of_node(_fwnode_), _propname_, \
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_type_, _val_, _nval_); \
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else if (is_acpi_node(_fwnode_)) \
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_ret_ = acpi_dev_prop_read(acpi_node(_fwnode_), _propname_, \
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_proptype_, _val_, _nval_); \
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else \
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_ret_ = -ENXIO; \
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_ret_; \
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})
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/**
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* fwnode_property_read_u8_array - return a u8 array property of firmware node
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* @fwnode: Firmware node 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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* Read an array of u8 properties with @propname from @fwnode and stores them to
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* @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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* %-ENXIO if no suitable firmware interface is present.
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*/
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int fwnode_property_read_u8_array(struct fwnode_handle *fwnode,
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const char *propname, u8 *val, size_t nval)
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{
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return FWNODE_PROP_READ_ARRAY(fwnode, propname, u8, DEV_PROP_U8,
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val, nval);
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}
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EXPORT_SYMBOL_GPL(fwnode_property_read_u8_array);
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/**
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* fwnode_property_read_u16_array - return a u16 array property of firmware node
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* @fwnode: Firmware node 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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* Read an array of u16 properties with @propname from @fwnode and store them to
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* @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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* %-ENXIO if no suitable firmware interface is present.
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*/
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int fwnode_property_read_u16_array(struct fwnode_handle *fwnode,
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const char *propname, u16 *val, size_t nval)
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{
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return FWNODE_PROP_READ_ARRAY(fwnode, propname, u16, DEV_PROP_U16,
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val, nval);
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}
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EXPORT_SYMBOL_GPL(fwnode_property_read_u16_array);
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/**
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* fwnode_property_read_u32_array - return a u32 array property of firmware node
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* @fwnode: Firmware node 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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* Read an array of u32 properties with @propname from @fwnode store them to
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* @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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* %-ENXIO if no suitable firmware interface is present.
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*/
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int fwnode_property_read_u32_array(struct fwnode_handle *fwnode,
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const char *propname, u32 *val, size_t nval)
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{
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return FWNODE_PROP_READ_ARRAY(fwnode, propname, u32, DEV_PROP_U32,
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val, nval);
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}
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EXPORT_SYMBOL_GPL(fwnode_property_read_u32_array);
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/**
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* fwnode_property_read_u64_array - return a u64 array property firmware node
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* @fwnode: Firmware node 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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* Read an array of u64 properties with @propname from @fwnode and store them to
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* @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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* %-ENXIO if no suitable firmware interface is present.
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*/
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int fwnode_property_read_u64_array(struct fwnode_handle *fwnode,
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const char *propname, u64 *val, size_t nval)
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{
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return FWNODE_PROP_READ_ARRAY(fwnode, propname, u64, DEV_PROP_U64,
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val, nval);
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}
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EXPORT_SYMBOL_GPL(fwnode_property_read_u64_array);
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/**
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* fwnode_property_read_string_array - return string array property of a node
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* @fwnode: Firmware node 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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* Read an string list property @propname from the given firmware node and store
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* 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 strings,
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* %-EOVERFLOW if the size of the property is not as expected,
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* %-ENXIO if no suitable firmware interface is present.
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*/
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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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{
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if (is_of_node(fwnode))
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return of_property_read_string_array(of_node(fwnode), propname,
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val, nval);
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else if (is_acpi_node(fwnode))
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return acpi_dev_prop_read(acpi_node(fwnode), propname,
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DEV_PROP_STRING, val, nval);
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return -ENXIO;
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}
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EXPORT_SYMBOL_GPL(fwnode_property_read_string_array);
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/**
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* fwnode_property_read_string - return a string property of a firmware node
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* @fwnode: Firmware node 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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* Read property @propname from the given firmware node and store the value into
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* @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 is not a string,
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* %-ENXIO if no suitable firmware interface is present.
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*/
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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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{
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if (is_of_node(fwnode))
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return of_property_read_string(of_node(fwnode),propname, val);
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else if (is_acpi_node(fwnode))
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return acpi_dev_prop_read(acpi_node(fwnode), propname,
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DEV_PROP_STRING, val, 1);
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return -ENXIO;
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}
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EXPORT_SYMBOL_GPL(fwnode_property_read_string);
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/**
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* device_get_next_child_node - Return the next child node handle for a device
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* @dev: Device to find the next child node for.
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* @child: Handle to one of the device's child nodes or a null handle.
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*/
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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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{
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if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
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struct device_node *node;
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node = of_get_next_available_child(dev->of_node, of_node(child));
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if (node)
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return &node->fwnode;
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} else if (IS_ENABLED(CONFIG_ACPI)) {
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struct acpi_device *node;
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node = acpi_get_next_child(dev, acpi_node(child));
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if (node)
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return acpi_fwnode_handle(node);
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(device_get_next_child_node);
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/**
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* fwnode_handle_put - Drop reference to a device node
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* @fwnode: Pointer to the device node to drop the reference to.
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*
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* This has to be used when terminating device_for_each_child_node() iteration
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* with break or return to prevent stale device node references from being left
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* behind.
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*/
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void fwnode_handle_put(struct fwnode_handle *fwnode)
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{
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if (is_of_node(fwnode))
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of_node_put(of_node(fwnode));
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}
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EXPORT_SYMBOL_GPL(fwnode_handle_put);
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/**
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* device_get_child_node_count - return the number of child nodes for device
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* @dev: Device to cound the child nodes for
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*/
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unsigned int device_get_child_node_count(struct device *dev)
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{
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struct fwnode_handle *child;
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unsigned int count = 0;
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device_for_each_child_node(dev, child)
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count++;
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return count;
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}
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EXPORT_SYMBOL_GPL(device_get_child_node_count);
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