mirror of https://gitee.com/openkylin/linux.git
1178 lines
38 KiB
C
1178 lines
38 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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#include <linux/acpi.h>
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_graph.h>
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#include <linux/of_irq.h>
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#include <linux/property.h>
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#include <linux/etherdevice.h>
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#include <linux/phy.h>
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struct fwnode_handle *dev_fwnode(struct device *dev)
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{
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return IS_ENABLED(CONFIG_OF) && dev->of_node ?
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&dev->of_node->fwnode : dev->fwnode;
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}
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EXPORT_SYMBOL_GPL(dev_fwnode);
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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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return fwnode_property_present(dev_fwnode(dev), propname);
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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(const struct fwnode_handle *fwnode,
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const char *propname)
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{
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bool ret;
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ret = fwnode_call_bool_op(fwnode, property_present, propname);
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if (ret == false && !IS_ERR_OR_NULL(fwnode) &&
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!IS_ERR_OR_NULL(fwnode->secondary))
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ret = fwnode_call_bool_op(fwnode->secondary, property_present,
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propname);
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return ret;
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}
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EXPORT_SYMBOL_GPL(fwnode_property_present);
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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 or %NULL to return the number of values
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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: number of values if @val was %NULL,
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* %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 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 fwnode_property_read_u8_array(dev_fwnode(dev), propname, 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 or %NULL to return the number of values
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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: number of values if @val was %NULL,
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* %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 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 fwnode_property_read_u16_array(dev_fwnode(dev), propname, 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 or %NULL to return the number of values
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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: number of values if @val was %NULL,
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* %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 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 fwnode_property_read_u32_array(dev_fwnode(dev), propname, 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 or %NULL to return the number of values
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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: number of values if @val was %NULL,
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* %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 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 fwnode_property_read_u64_array(dev_fwnode(dev), propname, 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 or %NULL to return the number of values
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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: number of values read on success if @val is non-NULL,
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* number of values available on success if @val is NULL,
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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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* %-ENXIO if no suitable firmware interface is present.
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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 fwnode_property_read_string_array(dev_fwnode(dev), propname, 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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* %-ENXIO if no suitable firmware interface is present.
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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 fwnode_property_read_string(dev_fwnode(dev), propname, val);
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}
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EXPORT_SYMBOL_GPL(device_property_read_string);
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/**
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* device_property_match_string - find a string in an array and return index
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* @dev: Device to get the property of
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* @propname: Name of the property holding the array
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* @string: String to look for
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*
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* Find a given string in a string array and if it is found return the
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* index back.
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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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* %-ENXIO if no suitable firmware interface is present.
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*/
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int device_property_match_string(struct device *dev, const char *propname,
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const char *string)
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{
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return fwnode_property_match_string(dev_fwnode(dev), propname, string);
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}
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EXPORT_SYMBOL_GPL(device_property_match_string);
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static int fwnode_property_read_int_array(const struct fwnode_handle *fwnode,
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const char *propname,
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unsigned int elem_size, void *val,
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size_t nval)
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{
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int ret;
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ret = fwnode_call_int_op(fwnode, property_read_int_array, propname,
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elem_size, val, nval);
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if (ret == -EINVAL && !IS_ERR_OR_NULL(fwnode) &&
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!IS_ERR_OR_NULL(fwnode->secondary))
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ret = fwnode_call_int_op(
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fwnode->secondary, property_read_int_array, propname,
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elem_size, val, nval);
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return 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 or %NULL to return the number of values
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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: number of values if @val was %NULL,
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* %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(const 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_property_read_int_array(fwnode, propname, sizeof(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 or %NULL to return the number of values
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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: number of values if @val was %NULL,
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* %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(const 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_property_read_int_array(fwnode, propname, sizeof(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 or %NULL to return the number of values
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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: number of values if @val was %NULL,
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* %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(const 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_property_read_int_array(fwnode, propname, sizeof(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 or %NULL to return the number of values
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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: number of values if @val was %NULL,
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* %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(const 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_property_read_int_array(fwnode, propname, sizeof(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 or %NULL to return the number of values
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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: number of values read on success if @val is non-NULL,
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* number of values available on success if @val is NULL,
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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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* %-ENXIO if no suitable firmware interface is present.
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*/
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int fwnode_property_read_string_array(const 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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int ret;
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ret = fwnode_call_int_op(fwnode, property_read_string_array, propname,
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val, nval);
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if (ret == -EINVAL && !IS_ERR_OR_NULL(fwnode) &&
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!IS_ERR_OR_NULL(fwnode->secondary))
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ret = fwnode_call_int_op(fwnode->secondary,
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property_read_string_array, propname,
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val, nval);
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return ret;
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}
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EXPORT_SYMBOL_GPL(fwnode_property_read_string_array);
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|
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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(const struct fwnode_handle *fwnode,
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const char *propname, const char **val)
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{
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int ret = fwnode_property_read_string_array(fwnode, propname, val, 1);
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return ret < 0 ? ret : 0;
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}
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EXPORT_SYMBOL_GPL(fwnode_property_read_string);
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/**
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* fwnode_property_match_string - find a string in an array and return index
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* @fwnode: Firmware node to get the property of
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* @propname: Name of the property holding the array
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* @string: String to look for
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*
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* Find a given string in a string array and if it is found return the
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* index back.
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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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* %-ENXIO if no suitable firmware interface is present.
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*/
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int fwnode_property_match_string(const struct fwnode_handle *fwnode,
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const char *propname, const char *string)
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{
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const char **values;
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int nval, ret;
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nval = fwnode_property_read_string_array(fwnode, propname, NULL, 0);
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if (nval < 0)
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return nval;
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if (nval == 0)
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return -ENODATA;
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values = kcalloc(nval, sizeof(*values), GFP_KERNEL);
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if (!values)
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return -ENOMEM;
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ret = fwnode_property_read_string_array(fwnode, propname, values, nval);
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if (ret < 0)
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goto out;
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|
|
ret = match_string(values, nval, string);
|
|
if (ret < 0)
|
|
ret = -ENODATA;
|
|
out:
|
|
kfree(values);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_property_match_string);
|
|
|
|
/**
|
|
* fwnode_property_get_reference_args() - Find a reference with arguments
|
|
* @fwnode: Firmware node where to look for the reference
|
|
* @prop: The name of the property
|
|
* @nargs_prop: The name of the property telling the number of
|
|
* arguments in the referred node. NULL if @nargs is known,
|
|
* otherwise @nargs is ignored. Only relevant on OF.
|
|
* @nargs: Number of arguments. Ignored if @nargs_prop is non-NULL.
|
|
* @index: Index of the reference, from zero onwards.
|
|
* @args: Result structure with reference and integer arguments.
|
|
*
|
|
* Obtain a reference based on a named property in an fwnode, with
|
|
* integer arguments.
|
|
*
|
|
* Caller is responsible to call fwnode_handle_put() on the returned
|
|
* args->fwnode pointer.
|
|
*
|
|
* Returns: %0 on success
|
|
* %-ENOENT when the index is out of bounds, the index has an empty
|
|
* reference or the property was not found
|
|
* %-EINVAL on parse error
|
|
*/
|
|
int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode,
|
|
const char *prop, const char *nargs_prop,
|
|
unsigned int nargs, unsigned int index,
|
|
struct fwnode_reference_args *args)
|
|
{
|
|
return fwnode_call_int_op(fwnode, get_reference_args, prop, nargs_prop,
|
|
nargs, index, args);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_property_get_reference_args);
|
|
|
|
/**
|
|
* fwnode_find_reference - Find named reference to a fwnode_handle
|
|
* @fwnode: Firmware node where to look for the reference
|
|
* @name: The name of the reference
|
|
* @index: Index of the reference
|
|
*
|
|
* @index can be used when the named reference holds a table of references.
|
|
*
|
|
* Returns pointer to the reference fwnode, or ERR_PTR. Caller is responsible to
|
|
* call fwnode_handle_put() on the returned fwnode pointer.
|
|
*/
|
|
struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode,
|
|
const char *name,
|
|
unsigned int index)
|
|
{
|
|
struct fwnode_reference_args args;
|
|
int ret;
|
|
|
|
ret = fwnode_property_get_reference_args(fwnode, name, NULL, 0, index,
|
|
&args);
|
|
return ret ? ERR_PTR(ret) : args.fwnode;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_find_reference);
|
|
|
|
/**
|
|
* device_remove_properties - Remove properties from a device object.
|
|
* @dev: Device whose properties to remove.
|
|
*
|
|
* The function removes properties previously associated to the device
|
|
* firmware node with device_add_properties(). Memory allocated to the
|
|
* properties will also be released.
|
|
*/
|
|
void device_remove_properties(struct device *dev)
|
|
{
|
|
struct fwnode_handle *fwnode = dev_fwnode(dev);
|
|
|
|
if (!fwnode)
|
|
return;
|
|
|
|
if (is_software_node(fwnode->secondary)) {
|
|
fwnode_remove_software_node(fwnode->secondary);
|
|
set_secondary_fwnode(dev, NULL);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_remove_properties);
|
|
|
|
/**
|
|
* device_add_properties - Add a collection of properties to a device object.
|
|
* @dev: Device to add properties to.
|
|
* @properties: Collection of properties to add.
|
|
*
|
|
* Associate a collection of device properties represented by @properties with
|
|
* @dev. The function takes a copy of @properties.
|
|
*
|
|
* WARNING: The callers should not use this function if it is known that there
|
|
* is no real firmware node associated with @dev! In that case the callers
|
|
* should create a software node and assign it to @dev directly.
|
|
*/
|
|
int device_add_properties(struct device *dev,
|
|
const struct property_entry *properties)
|
|
{
|
|
struct fwnode_handle *fwnode;
|
|
|
|
fwnode = fwnode_create_software_node(properties, NULL);
|
|
if (IS_ERR(fwnode))
|
|
return PTR_ERR(fwnode);
|
|
|
|
set_secondary_fwnode(dev, fwnode);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_add_properties);
|
|
|
|
/**
|
|
* fwnode_get_name - Return the name of a node
|
|
* @fwnode: The firmware node
|
|
*
|
|
* Returns a pointer to the node name.
|
|
*/
|
|
const char *fwnode_get_name(const struct fwnode_handle *fwnode)
|
|
{
|
|
return fwnode_call_ptr_op(fwnode, get_name);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_get_name);
|
|
|
|
/**
|
|
* fwnode_get_name_prefix - Return the prefix of node for printing purposes
|
|
* @fwnode: The firmware node
|
|
*
|
|
* Returns the prefix of a node, intended to be printed right before the node.
|
|
* The prefix works also as a separator between the nodes.
|
|
*/
|
|
const char *fwnode_get_name_prefix(const struct fwnode_handle *fwnode)
|
|
{
|
|
return fwnode_call_ptr_op(fwnode, get_name_prefix);
|
|
}
|
|
|
|
/**
|
|
* fwnode_get_parent - Return parent firwmare node
|
|
* @fwnode: Firmware whose parent is retrieved
|
|
*
|
|
* Return parent firmware node of the given node if possible or %NULL if no
|
|
* parent was available.
|
|
*/
|
|
struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode)
|
|
{
|
|
return fwnode_call_ptr_op(fwnode, get_parent);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_get_parent);
|
|
|
|
/**
|
|
* fwnode_get_next_parent - Iterate to the node's parent
|
|
* @fwnode: Firmware whose parent is retrieved
|
|
*
|
|
* This is like fwnode_get_parent() except that it drops the refcount
|
|
* on the passed node, making it suitable for iterating through a
|
|
* node's parents.
|
|
*
|
|
* Returns a node pointer with refcount incremented, use
|
|
* fwnode_handle_node() on it when done.
|
|
*/
|
|
struct fwnode_handle *fwnode_get_next_parent(struct fwnode_handle *fwnode)
|
|
{
|
|
struct fwnode_handle *parent = fwnode_get_parent(fwnode);
|
|
|
|
fwnode_handle_put(fwnode);
|
|
|
|
return parent;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_get_next_parent);
|
|
|
|
/**
|
|
* fwnode_count_parents - Return the number of parents a node has
|
|
* @fwnode: The node the parents of which are to be counted
|
|
*
|
|
* Returns the number of parents a node has.
|
|
*/
|
|
unsigned int fwnode_count_parents(const struct fwnode_handle *fwnode)
|
|
{
|
|
struct fwnode_handle *__fwnode;
|
|
unsigned int count;
|
|
|
|
__fwnode = fwnode_get_parent(fwnode);
|
|
|
|
for (count = 0; __fwnode; count++)
|
|
__fwnode = fwnode_get_next_parent(__fwnode);
|
|
|
|
return count;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_count_parents);
|
|
|
|
/**
|
|
* fwnode_get_nth_parent - Return an nth parent of a node
|
|
* @fwnode: The node the parent of which is requested
|
|
* @depth: Distance of the parent from the node
|
|
*
|
|
* Returns the nth parent of a node. If there is no parent at the requested
|
|
* @depth, %NULL is returned. If @depth is 0, the functionality is equivalent to
|
|
* fwnode_handle_get(). For @depth == 1, it is fwnode_get_parent() and so on.
|
|
*
|
|
* The caller is responsible for calling fwnode_handle_put() for the returned
|
|
* node.
|
|
*/
|
|
struct fwnode_handle *fwnode_get_nth_parent(struct fwnode_handle *fwnode,
|
|
unsigned int depth)
|
|
{
|
|
unsigned int i;
|
|
|
|
fwnode_handle_get(fwnode);
|
|
|
|
for (i = 0; i < depth && fwnode; i++)
|
|
fwnode = fwnode_get_next_parent(fwnode);
|
|
|
|
return fwnode;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_get_nth_parent);
|
|
|
|
/**
|
|
* fwnode_get_next_child_node - Return the next child node handle for a node
|
|
* @fwnode: Firmware node to find the next child node for.
|
|
* @child: Handle to one of the node's child nodes or a %NULL handle.
|
|
*/
|
|
struct fwnode_handle *
|
|
fwnode_get_next_child_node(const struct fwnode_handle *fwnode,
|
|
struct fwnode_handle *child)
|
|
{
|
|
return fwnode_call_ptr_op(fwnode, get_next_child_node, child);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_get_next_child_node);
|
|
|
|
/**
|
|
* fwnode_get_next_available_child_node - Return the next
|
|
* available child node handle for a node
|
|
* @fwnode: Firmware node to find the next child node for.
|
|
* @child: Handle to one of the node's child nodes or a %NULL handle.
|
|
*/
|
|
struct fwnode_handle *
|
|
fwnode_get_next_available_child_node(const struct fwnode_handle *fwnode,
|
|
struct fwnode_handle *child)
|
|
{
|
|
struct fwnode_handle *next_child = child;
|
|
|
|
if (!fwnode)
|
|
return NULL;
|
|
|
|
do {
|
|
next_child = fwnode_get_next_child_node(fwnode, next_child);
|
|
|
|
if (!next_child || fwnode_device_is_available(next_child))
|
|
break;
|
|
} while (next_child);
|
|
|
|
return next_child;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_get_next_available_child_node);
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
struct fwnode_handle *fwnode = NULL;
|
|
|
|
if (dev->of_node)
|
|
fwnode = &dev->of_node->fwnode;
|
|
else if (adev)
|
|
fwnode = acpi_fwnode_handle(adev);
|
|
|
|
return fwnode_get_next_child_node(fwnode, child);
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_get_next_child_node);
|
|
|
|
/**
|
|
* fwnode_get_named_child_node - Return first matching named child node handle
|
|
* @fwnode: Firmware node to find the named child node for.
|
|
* @childname: String to match child node name against.
|
|
*/
|
|
struct fwnode_handle *
|
|
fwnode_get_named_child_node(const struct fwnode_handle *fwnode,
|
|
const char *childname)
|
|
{
|
|
return fwnode_call_ptr_op(fwnode, get_named_child_node, childname);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_get_named_child_node);
|
|
|
|
/**
|
|
* device_get_named_child_node - Return first matching named child node handle
|
|
* @dev: Device to find the named child node for.
|
|
* @childname: String to match child node name against.
|
|
*/
|
|
struct fwnode_handle *device_get_named_child_node(struct device *dev,
|
|
const char *childname)
|
|
{
|
|
return fwnode_get_named_child_node(dev_fwnode(dev), childname);
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_get_named_child_node);
|
|
|
|
/**
|
|
* fwnode_handle_get - Obtain a reference to a device node
|
|
* @fwnode: Pointer to the device node to obtain the reference to.
|
|
*
|
|
* Returns the fwnode handle.
|
|
*/
|
|
struct fwnode_handle *fwnode_handle_get(struct fwnode_handle *fwnode)
|
|
{
|
|
if (!fwnode_has_op(fwnode, get))
|
|
return fwnode;
|
|
|
|
return fwnode_call_ptr_op(fwnode, get);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_handle_get);
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
fwnode_call_void_op(fwnode, put);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_handle_put);
|
|
|
|
/**
|
|
* fwnode_device_is_available - check if a device is available for use
|
|
* @fwnode: Pointer to the fwnode of the device.
|
|
*/
|
|
bool fwnode_device_is_available(const struct fwnode_handle *fwnode)
|
|
{
|
|
return fwnode_call_bool_op(fwnode, device_is_available);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_device_is_available);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
bool device_dma_supported(struct device *dev)
|
|
{
|
|
/* For DT, this is always supported.
|
|
* For ACPI, this depends on CCA, which
|
|
* is determined by the acpi_dma_supported().
|
|
*/
|
|
if (IS_ENABLED(CONFIG_OF) && dev->of_node)
|
|
return true;
|
|
|
|
return acpi_dma_supported(ACPI_COMPANION(dev));
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_dma_supported);
|
|
|
|
enum dev_dma_attr device_get_dma_attr(struct device *dev)
|
|
{
|
|
enum dev_dma_attr attr = DEV_DMA_NOT_SUPPORTED;
|
|
|
|
if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
|
|
if (of_dma_is_coherent(dev->of_node))
|
|
attr = DEV_DMA_COHERENT;
|
|
else
|
|
attr = DEV_DMA_NON_COHERENT;
|
|
} else
|
|
attr = acpi_get_dma_attr(ACPI_COMPANION(dev));
|
|
|
|
return attr;
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_get_dma_attr);
|
|
|
|
/**
|
|
* fwnode_get_phy_mode - Get phy mode for given firmware node
|
|
* @fwnode: Pointer to the given node
|
|
*
|
|
* The function gets phy interface string from property 'phy-mode' or
|
|
* 'phy-connection-type', and return its index in phy_modes table, or errno in
|
|
* error case.
|
|
*/
|
|
int fwnode_get_phy_mode(struct fwnode_handle *fwnode)
|
|
{
|
|
const char *pm;
|
|
int err, i;
|
|
|
|
err = fwnode_property_read_string(fwnode, "phy-mode", &pm);
|
|
if (err < 0)
|
|
err = fwnode_property_read_string(fwnode,
|
|
"phy-connection-type", &pm);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++)
|
|
if (!strcasecmp(pm, phy_modes(i)))
|
|
return i;
|
|
|
|
return -ENODEV;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_get_phy_mode);
|
|
|
|
/**
|
|
* device_get_phy_mode - Get phy mode for given device
|
|
* @dev: Pointer to the given device
|
|
*
|
|
* The function gets phy interface string from property 'phy-mode' or
|
|
* 'phy-connection-type', and return its index in phy_modes table, or errno in
|
|
* error case.
|
|
*/
|
|
int device_get_phy_mode(struct device *dev)
|
|
{
|
|
return fwnode_get_phy_mode(dev_fwnode(dev));
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_get_phy_mode);
|
|
|
|
static void *fwnode_get_mac_addr(struct fwnode_handle *fwnode,
|
|
const char *name, char *addr,
|
|
int alen)
|
|
{
|
|
int ret = fwnode_property_read_u8_array(fwnode, name, addr, alen);
|
|
|
|
if (ret == 0 && alen == ETH_ALEN && is_valid_ether_addr(addr))
|
|
return addr;
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* fwnode_get_mac_address - Get the MAC from the firmware node
|
|
* @fwnode: Pointer to the firmware node
|
|
* @addr: Address of buffer to store the MAC in
|
|
* @alen: Length of the buffer pointed to by addr, should be ETH_ALEN
|
|
*
|
|
* Search the firmware node for the best MAC address to use. 'mac-address' is
|
|
* checked first, because that is supposed to contain to "most recent" MAC
|
|
* address. If that isn't set, then 'local-mac-address' is checked next,
|
|
* because that is the default address. If that isn't set, then the obsolete
|
|
* 'address' is checked, just in case we're using an old device tree.
|
|
*
|
|
* Note that the 'address' property is supposed to contain a virtual address of
|
|
* the register set, but some DTS files have redefined that property to be the
|
|
* MAC address.
|
|
*
|
|
* All-zero MAC addresses are rejected, because those could be properties that
|
|
* exist in the firmware tables, but were not updated by the firmware. For
|
|
* example, the DTS could define 'mac-address' and 'local-mac-address', with
|
|
* zero MAC addresses. Some older U-Boots only initialized 'local-mac-address'.
|
|
* In this case, the real MAC is in 'local-mac-address', and 'mac-address'
|
|
* exists but is all zeros.
|
|
*/
|
|
void *fwnode_get_mac_address(struct fwnode_handle *fwnode, char *addr, int alen)
|
|
{
|
|
char *res;
|
|
|
|
res = fwnode_get_mac_addr(fwnode, "mac-address", addr, alen);
|
|
if (res)
|
|
return res;
|
|
|
|
res = fwnode_get_mac_addr(fwnode, "local-mac-address", addr, alen);
|
|
if (res)
|
|
return res;
|
|
|
|
return fwnode_get_mac_addr(fwnode, "address", addr, alen);
|
|
}
|
|
EXPORT_SYMBOL(fwnode_get_mac_address);
|
|
|
|
/**
|
|
* device_get_mac_address - Get the MAC for a given device
|
|
* @dev: Pointer to the device
|
|
* @addr: Address of buffer to store the MAC in
|
|
* @alen: Length of the buffer pointed to by addr, should be ETH_ALEN
|
|
*/
|
|
void *device_get_mac_address(struct device *dev, char *addr, int alen)
|
|
{
|
|
return fwnode_get_mac_address(dev_fwnode(dev), addr, alen);
|
|
}
|
|
EXPORT_SYMBOL(device_get_mac_address);
|
|
|
|
/**
|
|
* fwnode_irq_get - Get IRQ directly from a fwnode
|
|
* @fwnode: Pointer to the firmware node
|
|
* @index: Zero-based index of the IRQ
|
|
*
|
|
* Returns Linux IRQ number on success. Other values are determined
|
|
* accordingly to acpi_/of_ irq_get() operation.
|
|
*/
|
|
int fwnode_irq_get(struct fwnode_handle *fwnode, unsigned int index)
|
|
{
|
|
struct device_node *of_node = to_of_node(fwnode);
|
|
struct resource res;
|
|
int ret;
|
|
|
|
if (IS_ENABLED(CONFIG_OF) && of_node)
|
|
return of_irq_get(of_node, index);
|
|
|
|
ret = acpi_irq_get(ACPI_HANDLE_FWNODE(fwnode), index, &res);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return res.start;
|
|
}
|
|
EXPORT_SYMBOL(fwnode_irq_get);
|
|
|
|
/**
|
|
* fwnode_graph_get_next_endpoint - Get next endpoint firmware node
|
|
* @fwnode: Pointer to the parent firmware node
|
|
* @prev: Previous endpoint node or %NULL to get the first
|
|
*
|
|
* Returns an endpoint firmware node pointer or %NULL if no more endpoints
|
|
* are available.
|
|
*/
|
|
struct fwnode_handle *
|
|
fwnode_graph_get_next_endpoint(const struct fwnode_handle *fwnode,
|
|
struct fwnode_handle *prev)
|
|
{
|
|
return fwnode_call_ptr_op(fwnode, graph_get_next_endpoint, prev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_graph_get_next_endpoint);
|
|
|
|
/**
|
|
* fwnode_graph_get_port_parent - Return the device fwnode of a port endpoint
|
|
* @endpoint: Endpoint firmware node of the port
|
|
*
|
|
* Return: the firmware node of the device the @endpoint belongs to.
|
|
*/
|
|
struct fwnode_handle *
|
|
fwnode_graph_get_port_parent(const struct fwnode_handle *endpoint)
|
|
{
|
|
struct fwnode_handle *port, *parent;
|
|
|
|
port = fwnode_get_parent(endpoint);
|
|
parent = fwnode_call_ptr_op(port, graph_get_port_parent);
|
|
|
|
fwnode_handle_put(port);
|
|
|
|
return parent;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_graph_get_port_parent);
|
|
|
|
/**
|
|
* fwnode_graph_get_remote_port_parent - Return fwnode of a remote device
|
|
* @fwnode: Endpoint firmware node pointing to the remote endpoint
|
|
*
|
|
* Extracts firmware node of a remote device the @fwnode points to.
|
|
*/
|
|
struct fwnode_handle *
|
|
fwnode_graph_get_remote_port_parent(const struct fwnode_handle *fwnode)
|
|
{
|
|
struct fwnode_handle *endpoint, *parent;
|
|
|
|
endpoint = fwnode_graph_get_remote_endpoint(fwnode);
|
|
parent = fwnode_graph_get_port_parent(endpoint);
|
|
|
|
fwnode_handle_put(endpoint);
|
|
|
|
return parent;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_port_parent);
|
|
|
|
/**
|
|
* fwnode_graph_get_remote_port - Return fwnode of a remote port
|
|
* @fwnode: Endpoint firmware node pointing to the remote endpoint
|
|
*
|
|
* Extracts firmware node of a remote port the @fwnode points to.
|
|
*/
|
|
struct fwnode_handle *
|
|
fwnode_graph_get_remote_port(const struct fwnode_handle *fwnode)
|
|
{
|
|
return fwnode_get_next_parent(fwnode_graph_get_remote_endpoint(fwnode));
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_port);
|
|
|
|
/**
|
|
* fwnode_graph_get_remote_endpoint - Return fwnode of a remote endpoint
|
|
* @fwnode: Endpoint firmware node pointing to the remote endpoint
|
|
*
|
|
* Extracts firmware node of a remote endpoint the @fwnode points to.
|
|
*/
|
|
struct fwnode_handle *
|
|
fwnode_graph_get_remote_endpoint(const struct fwnode_handle *fwnode)
|
|
{
|
|
return fwnode_call_ptr_op(fwnode, graph_get_remote_endpoint);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_endpoint);
|
|
|
|
/**
|
|
* fwnode_graph_get_remote_node - get remote parent node for given port/endpoint
|
|
* @fwnode: pointer to parent fwnode_handle containing graph port/endpoint
|
|
* @port_id: identifier of the parent port node
|
|
* @endpoint_id: identifier of the endpoint node
|
|
*
|
|
* Return: Remote fwnode handle associated with remote endpoint node linked
|
|
* to @node. Use fwnode_node_put() on it when done.
|
|
*/
|
|
struct fwnode_handle *
|
|
fwnode_graph_get_remote_node(const struct fwnode_handle *fwnode, u32 port_id,
|
|
u32 endpoint_id)
|
|
{
|
|
struct fwnode_handle *endpoint = NULL;
|
|
|
|
while ((endpoint = fwnode_graph_get_next_endpoint(fwnode, endpoint))) {
|
|
struct fwnode_endpoint fwnode_ep;
|
|
struct fwnode_handle *remote;
|
|
int ret;
|
|
|
|
ret = fwnode_graph_parse_endpoint(endpoint, &fwnode_ep);
|
|
if (ret < 0)
|
|
continue;
|
|
|
|
if (fwnode_ep.port != port_id || fwnode_ep.id != endpoint_id)
|
|
continue;
|
|
|
|
remote = fwnode_graph_get_remote_port_parent(endpoint);
|
|
if (!remote)
|
|
return NULL;
|
|
|
|
return fwnode_device_is_available(remote) ? remote : NULL;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_node);
|
|
|
|
/**
|
|
* fwnode_graph_get_endpoint_by_id - get endpoint by port and endpoint numbers
|
|
* @fwnode: parent fwnode_handle containing the graph
|
|
* @port: identifier of the port node
|
|
* @endpoint: identifier of the endpoint node under the port node
|
|
* @flags: fwnode lookup flags
|
|
*
|
|
* Return the fwnode handle of the local endpoint corresponding the port and
|
|
* endpoint IDs or NULL if not found.
|
|
*
|
|
* If FWNODE_GRAPH_ENDPOINT_NEXT is passed in @flags and the specified endpoint
|
|
* has not been found, look for the closest endpoint ID greater than the
|
|
* specified one and return the endpoint that corresponds to it, if present.
|
|
*
|
|
* Do not return endpoints that belong to disabled devices, unless
|
|
* FWNODE_GRAPH_DEVICE_DISABLED is passed in @flags.
|
|
*
|
|
* The returned endpoint needs to be released by calling fwnode_handle_put() on
|
|
* it when it is not needed any more.
|
|
*/
|
|
struct fwnode_handle *
|
|
fwnode_graph_get_endpoint_by_id(const struct fwnode_handle *fwnode,
|
|
u32 port, u32 endpoint, unsigned long flags)
|
|
{
|
|
struct fwnode_handle *ep = NULL, *best_ep = NULL;
|
|
unsigned int best_ep_id = 0;
|
|
bool endpoint_next = flags & FWNODE_GRAPH_ENDPOINT_NEXT;
|
|
bool enabled_only = !(flags & FWNODE_GRAPH_DEVICE_DISABLED);
|
|
|
|
while ((ep = fwnode_graph_get_next_endpoint(fwnode, ep))) {
|
|
struct fwnode_endpoint fwnode_ep = { 0 };
|
|
int ret;
|
|
|
|
if (enabled_only) {
|
|
struct fwnode_handle *dev_node;
|
|
bool available;
|
|
|
|
dev_node = fwnode_graph_get_remote_port_parent(ep);
|
|
available = fwnode_device_is_available(dev_node);
|
|
fwnode_handle_put(dev_node);
|
|
if (!available)
|
|
continue;
|
|
}
|
|
|
|
ret = fwnode_graph_parse_endpoint(ep, &fwnode_ep);
|
|
if (ret < 0)
|
|
continue;
|
|
|
|
if (fwnode_ep.port != port)
|
|
continue;
|
|
|
|
if (fwnode_ep.id == endpoint)
|
|
return ep;
|
|
|
|
if (!endpoint_next)
|
|
continue;
|
|
|
|
/*
|
|
* If the endpoint that has just been found is not the first
|
|
* matching one and the ID of the one found previously is closer
|
|
* to the requested endpoint ID, skip it.
|
|
*/
|
|
if (fwnode_ep.id < endpoint ||
|
|
(best_ep && best_ep_id < fwnode_ep.id))
|
|
continue;
|
|
|
|
fwnode_handle_put(best_ep);
|
|
best_ep = fwnode_handle_get(ep);
|
|
best_ep_id = fwnode_ep.id;
|
|
}
|
|
|
|
return best_ep;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_graph_get_endpoint_by_id);
|
|
|
|
/**
|
|
* fwnode_graph_parse_endpoint - parse common endpoint node properties
|
|
* @fwnode: pointer to endpoint fwnode_handle
|
|
* @endpoint: pointer to the fwnode endpoint data structure
|
|
*
|
|
* Parse @fwnode representing a graph endpoint node and store the
|
|
* information in @endpoint. The caller must hold a reference to
|
|
* @fwnode.
|
|
*/
|
|
int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
|
|
struct fwnode_endpoint *endpoint)
|
|
{
|
|
memset(endpoint, 0, sizeof(*endpoint));
|
|
|
|
return fwnode_call_int_op(fwnode, graph_parse_endpoint, endpoint);
|
|
}
|
|
EXPORT_SYMBOL(fwnode_graph_parse_endpoint);
|
|
|
|
const void *device_get_match_data(struct device *dev)
|
|
{
|
|
return fwnode_call_ptr_op(dev_fwnode(dev), device_get_match_data, dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_get_match_data);
|