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613e97218c
For device nodes in both DT and ACPI, it possible to have named child nodes which contain properties (an existing example being gpio-leds). This adds a function to find a named child node for a device which can be used by drivers for property retrieval. For DT data node name matching, of_node_cmp() and similar functions are made available outside of CONFIG_OF block so the new function can reference these for DT and non-DT builds. For ACPI data node name matching, a helper function is also added which returns false if CONFIG_ACPI is not set, otherwise it performs a string comparison on the data node name. This avoids using the acpi_data_node struct for non CONFIG_ACPI builds, which would otherwise cause a build failure. Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com> Acked-by: Sathyanarayana Nujella <sathyanarayana.nujella@intel.com> Acked-by: Rob Herring <robh@kernel.org> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
1055 lines
32 KiB
C
1055 lines
32 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/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/property.h>
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#include <linux/etherdevice.h>
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#include <linux/phy.h>
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struct property_set {
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struct fwnode_handle fwnode;
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struct property_entry *properties;
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};
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static inline bool is_pset_node(struct fwnode_handle *fwnode)
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{
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return !IS_ERR_OR_NULL(fwnode) && fwnode->type == FWNODE_PDATA;
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}
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static inline struct property_set *to_pset_node(struct fwnode_handle *fwnode)
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{
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return is_pset_node(fwnode) ?
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container_of(fwnode, struct property_set, fwnode) : NULL;
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}
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static struct property_entry *pset_prop_get(struct property_set *pset,
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const char *name)
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{
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struct property_entry *prop;
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if (!pset || !pset->properties)
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return NULL;
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for (prop = pset->properties; prop->name; prop++)
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if (!strcmp(name, prop->name))
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return prop;
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return NULL;
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}
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static void *pset_prop_find(struct property_set *pset, const char *propname,
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size_t length)
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{
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struct property_entry *prop;
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void *pointer;
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prop = pset_prop_get(pset, propname);
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if (!prop)
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return ERR_PTR(-EINVAL);
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if (prop->is_array)
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pointer = prop->pointer.raw_data;
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else
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pointer = &prop->value.raw_data;
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if (!pointer)
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return ERR_PTR(-ENODATA);
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if (length > prop->length)
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return ERR_PTR(-EOVERFLOW);
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return pointer;
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}
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static int pset_prop_read_u8_array(struct property_set *pset,
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const char *propname,
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u8 *values, size_t nval)
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{
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void *pointer;
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size_t length = nval * sizeof(*values);
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pointer = pset_prop_find(pset, propname, length);
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if (IS_ERR(pointer))
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return PTR_ERR(pointer);
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memcpy(values, pointer, length);
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return 0;
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}
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static int pset_prop_read_u16_array(struct property_set *pset,
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const char *propname,
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u16 *values, size_t nval)
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{
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void *pointer;
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size_t length = nval * sizeof(*values);
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pointer = pset_prop_find(pset, propname, length);
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if (IS_ERR(pointer))
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return PTR_ERR(pointer);
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memcpy(values, pointer, length);
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return 0;
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}
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static int pset_prop_read_u32_array(struct property_set *pset,
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const char *propname,
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u32 *values, size_t nval)
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{
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void *pointer;
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size_t length = nval * sizeof(*values);
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pointer = pset_prop_find(pset, propname, length);
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if (IS_ERR(pointer))
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return PTR_ERR(pointer);
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memcpy(values, pointer, length);
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return 0;
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}
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static int pset_prop_read_u64_array(struct property_set *pset,
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const char *propname,
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u64 *values, size_t nval)
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{
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void *pointer;
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size_t length = nval * sizeof(*values);
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pointer = pset_prop_find(pset, propname, length);
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if (IS_ERR(pointer))
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return PTR_ERR(pointer);
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memcpy(values, pointer, length);
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return 0;
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}
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static int pset_prop_count_elems_of_size(struct property_set *pset,
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const char *propname, size_t length)
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{
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struct property_entry *prop;
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prop = pset_prop_get(pset, propname);
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if (!prop)
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return -EINVAL;
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return prop->length / length;
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}
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static int pset_prop_read_string_array(struct property_set *pset,
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const char *propname,
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const char **strings, size_t nval)
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{
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void *pointer;
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size_t length = nval * sizeof(*strings);
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pointer = pset_prop_find(pset, propname, length);
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if (IS_ERR(pointer))
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return PTR_ERR(pointer);
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memcpy(strings, pointer, length);
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return 0;
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}
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static int pset_prop_read_string(struct property_set *pset,
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const char *propname, const char **strings)
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{
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struct property_entry *prop;
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const char **pointer;
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prop = pset_prop_get(pset, propname);
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if (!prop)
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return -EINVAL;
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if (!prop->is_string)
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return -EILSEQ;
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if (prop->is_array) {
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pointer = prop->pointer.str;
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if (!pointer)
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return -ENODATA;
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} else {
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pointer = &prop->value.str;
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if (*pointer && strnlen(*pointer, prop->length) >= prop->length)
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return -EILSEQ;
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}
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*strings = *pointer;
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return 0;
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}
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static inline 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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/**
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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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static bool __fwnode_property_present(struct fwnode_handle *fwnode,
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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(to_of_node(fwnode), propname);
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else if (is_acpi_node(fwnode))
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return !acpi_node_prop_get(fwnode, propname, NULL);
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else if (is_pset_node(fwnode))
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return !!pset_prop_get(to_pset_node(fwnode), propname);
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return false;
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}
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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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bool ret;
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ret = __fwnode_property_present(fwnode, 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_property_present(fwnode->secondary, 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 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 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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#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 PSET_PROP_READ_ARRAY(node, propname, type, val, nval) \
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(val) ? pset_prop_read_##type##_array((node), (propname), (val), (nval)) \
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: pset_prop_count_elems_of_size((node), (propname), sizeof(type))
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#define FWNODE_PROP_READ(_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(to_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_node_prop_read(_fwnode_, _propname_, _proptype_, \
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_val_, _nval_); \
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else if (is_pset_node(_fwnode_)) \
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_ret_ = PSET_PROP_READ_ARRAY(to_pset_node(_fwnode_), _propname_, \
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_type_, _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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#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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_ret_ = FWNODE_PROP_READ(_fwnode_, _propname_, _type_, _proptype_, \
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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_PROP_READ(_fwnode_->secondary, _propname_, _type_, \
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_proptype_, _val_, _nval_); \
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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 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,
|
|
* %-ENXIO if no suitable firmware interface is present.
|
|
*/
|
|
int fwnode_property_read_u8_array(struct fwnode_handle *fwnode,
|
|
const char *propname, u8 *val, size_t nval)
|
|
{
|
|
return FWNODE_PROP_READ_ARRAY(fwnode, propname, u8, DEV_PROP_U8,
|
|
val, nval);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_property_read_u8_array);
|
|
|
|
/**
|
|
* fwnode_property_read_u16_array - return a u16 array property of firmware node
|
|
* @fwnode: Firmware node to get the property of
|
|
* @propname: Name of the property
|
|
* @val: The values are stored here or %NULL to return the number of values
|
|
* @nval: Size of the @val array
|
|
*
|
|
* Read an array of u16 properties with @propname from @fwnode and store them to
|
|
* @val if found.
|
|
*
|
|
* Return: number of values if @val was %NULL,
|
|
* %0 if the property was found (success),
|
|
* %-EINVAL if given arguments are not valid,
|
|
* %-ENODATA if the property does not have a value,
|
|
* %-EPROTO if the property is not an array of numbers,
|
|
* %-EOVERFLOW if the size of the property is not as expected,
|
|
* %-ENXIO if no suitable firmware interface is present.
|
|
*/
|
|
int fwnode_property_read_u16_array(struct fwnode_handle *fwnode,
|
|
const char *propname, u16 *val, size_t nval)
|
|
{
|
|
return FWNODE_PROP_READ_ARRAY(fwnode, propname, u16, DEV_PROP_U16,
|
|
val, nval);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_property_read_u16_array);
|
|
|
|
/**
|
|
* fwnode_property_read_u32_array - return a u32 array property of firmware node
|
|
* @fwnode: Firmware node to get the property of
|
|
* @propname: Name of the property
|
|
* @val: The values are stored here or %NULL to return the number of values
|
|
* @nval: Size of the @val array
|
|
*
|
|
* Read an array of u32 properties with @propname from @fwnode store them to
|
|
* @val if found.
|
|
*
|
|
* Return: number of values if @val was %NULL,
|
|
* %0 if the property was found (success),
|
|
* %-EINVAL if given arguments are not valid,
|
|
* %-ENODATA if the property does not have a value,
|
|
* %-EPROTO if the property is not an array of numbers,
|
|
* %-EOVERFLOW if the size of the property is not as expected,
|
|
* %-ENXIO if no suitable firmware interface is present.
|
|
*/
|
|
int fwnode_property_read_u32_array(struct fwnode_handle *fwnode,
|
|
const char *propname, u32 *val, size_t nval)
|
|
{
|
|
return FWNODE_PROP_READ_ARRAY(fwnode, propname, u32, DEV_PROP_U32,
|
|
val, nval);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_property_read_u32_array);
|
|
|
|
/**
|
|
* fwnode_property_read_u64_array - return a u64 array property firmware node
|
|
* @fwnode: Firmware node to get the property of
|
|
* @propname: Name of the property
|
|
* @val: The values are stored here or %NULL to return the number of values
|
|
* @nval: Size of the @val array
|
|
*
|
|
* Read an array of u64 properties with @propname from @fwnode and store them to
|
|
* @val if found.
|
|
*
|
|
* Return: number of values if @val was %NULL,
|
|
* %0 if the property was found (success),
|
|
* %-EINVAL if given arguments are not valid,
|
|
* %-ENODATA if the property does not have a value,
|
|
* %-EPROTO if the property is not an array of numbers,
|
|
* %-EOVERFLOW if the size of the property is not as expected,
|
|
* %-ENXIO if no suitable firmware interface is present.
|
|
*/
|
|
int fwnode_property_read_u64_array(struct fwnode_handle *fwnode,
|
|
const char *propname, u64 *val, size_t nval)
|
|
{
|
|
return FWNODE_PROP_READ_ARRAY(fwnode, propname, u64, DEV_PROP_U64,
|
|
val, nval);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_property_read_u64_array);
|
|
|
|
static int __fwnode_property_read_string_array(struct fwnode_handle *fwnode,
|
|
const char *propname,
|
|
const char **val, size_t nval)
|
|
{
|
|
if (is_of_node(fwnode))
|
|
return val ?
|
|
of_property_read_string_array(to_of_node(fwnode),
|
|
propname, val, nval) :
|
|
of_property_count_strings(to_of_node(fwnode), propname);
|
|
else if (is_acpi_node(fwnode))
|
|
return acpi_node_prop_read(fwnode, propname, DEV_PROP_STRING,
|
|
val, nval);
|
|
else if (is_pset_node(fwnode))
|
|
return val ?
|
|
pset_prop_read_string_array(to_pset_node(fwnode),
|
|
propname, val, nval) :
|
|
pset_prop_count_elems_of_size(to_pset_node(fwnode),
|
|
propname,
|
|
sizeof(const char *));
|
|
return -ENXIO;
|
|
}
|
|
|
|
static int __fwnode_property_read_string(struct fwnode_handle *fwnode,
|
|
const char *propname, const char **val)
|
|
{
|
|
if (is_of_node(fwnode))
|
|
return of_property_read_string(to_of_node(fwnode), propname, val);
|
|
else if (is_acpi_node(fwnode))
|
|
return acpi_node_prop_read(fwnode, propname, DEV_PROP_STRING,
|
|
val, 1);
|
|
else if (is_pset_node(fwnode))
|
|
return pset_prop_read_string(to_pset_node(fwnode), propname, val);
|
|
return -ENXIO;
|
|
}
|
|
|
|
/**
|
|
* fwnode_property_read_string_array - return string array property of a node
|
|
* @fwnode: Firmware node to get the property of
|
|
* @propname: Name of the property
|
|
* @val: The values are stored here or %NULL to return the number of values
|
|
* @nval: Size of the @val array
|
|
*
|
|
* Read an string list property @propname from the given firmware node and store
|
|
* them to @val if found.
|
|
*
|
|
* Return: number of values if @val was %NULL,
|
|
* %0 if the property was found (success),
|
|
* %-EINVAL if given arguments are not valid,
|
|
* %-ENODATA if the property does not have a value,
|
|
* %-EPROTO if the property is not an array of strings,
|
|
* %-EOVERFLOW if the size of the property is not as expected,
|
|
* %-ENXIO if no suitable firmware interface is present.
|
|
*/
|
|
int fwnode_property_read_string_array(struct fwnode_handle *fwnode,
|
|
const char *propname, const char **val,
|
|
size_t nval)
|
|
{
|
|
int ret;
|
|
|
|
ret = __fwnode_property_read_string_array(fwnode, propname, val, nval);
|
|
if (ret == -EINVAL && !IS_ERR_OR_NULL(fwnode) &&
|
|
!IS_ERR_OR_NULL(fwnode->secondary))
|
|
ret = __fwnode_property_read_string_array(fwnode->secondary,
|
|
propname, val, nval);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_property_read_string_array);
|
|
|
|
/**
|
|
* fwnode_property_read_string - return a string property of a firmware node
|
|
* @fwnode: Firmware node to get the property of
|
|
* @propname: Name of the property
|
|
* @val: The value is stored here
|
|
*
|
|
* Read property @propname from the given firmware node and store the value into
|
|
* @val if found. The value is checked to be a string.
|
|
*
|
|
* Return: %0 if the property was found (success),
|
|
* %-EINVAL if given arguments are not valid,
|
|
* %-ENODATA if the property does not have a value,
|
|
* %-EPROTO or %-EILSEQ if the property is not a string,
|
|
* %-ENXIO if no suitable firmware interface is present.
|
|
*/
|
|
int fwnode_property_read_string(struct fwnode_handle *fwnode,
|
|
const char *propname, const char **val)
|
|
{
|
|
int ret;
|
|
|
|
ret = __fwnode_property_read_string(fwnode, propname, val);
|
|
if (ret == -EINVAL && !IS_ERR_OR_NULL(fwnode) &&
|
|
!IS_ERR_OR_NULL(fwnode->secondary))
|
|
ret = __fwnode_property_read_string(fwnode->secondary,
|
|
propname, val);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_property_read_string);
|
|
|
|
/**
|
|
* fwnode_property_match_string - find a string in an array and return index
|
|
* @fwnode: Firmware node to get the property of
|
|
* @propname: Name of the property holding the array
|
|
* @string: String to look for
|
|
*
|
|
* Find a given string in a string array and if it is found return the
|
|
* index back.
|
|
*
|
|
* Return: %0 if the property was found (success),
|
|
* %-EINVAL if given arguments are not valid,
|
|
* %-ENODATA if the property does not have a value,
|
|
* %-EPROTO if the property is not an array of strings,
|
|
* %-ENXIO if no suitable firmware interface is present.
|
|
*/
|
|
int fwnode_property_match_string(struct fwnode_handle *fwnode,
|
|
const char *propname, const char *string)
|
|
{
|
|
const char **values;
|
|
int nval, ret;
|
|
|
|
nval = fwnode_property_read_string_array(fwnode, propname, NULL, 0);
|
|
if (nval < 0)
|
|
return nval;
|
|
|
|
if (nval == 0)
|
|
return -ENODATA;
|
|
|
|
values = kcalloc(nval, sizeof(*values), GFP_KERNEL);
|
|
if (!values)
|
|
return -ENOMEM;
|
|
|
|
ret = fwnode_property_read_string_array(fwnode, propname, values, nval);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = match_string(values, nval, string);
|
|
if (ret < 0)
|
|
ret = -ENODATA;
|
|
out:
|
|
kfree(values);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_property_match_string);
|
|
|
|
/**
|
|
* pset_free_set - releases memory allocated for copied property set
|
|
* @pset: Property set to release
|
|
*
|
|
* Function takes previously copied property set and releases all the
|
|
* memory allocated to it.
|
|
*/
|
|
static void pset_free_set(struct property_set *pset)
|
|
{
|
|
const struct property_entry *prop;
|
|
size_t i, nval;
|
|
|
|
if (!pset)
|
|
return;
|
|
|
|
for (prop = pset->properties; prop->name; prop++) {
|
|
if (prop->is_array) {
|
|
if (prop->is_string && prop->pointer.str) {
|
|
nval = prop->length / sizeof(const char *);
|
|
for (i = 0; i < nval; i++)
|
|
kfree(prop->pointer.str[i]);
|
|
}
|
|
kfree(prop->pointer.raw_data);
|
|
} else if (prop->is_string) {
|
|
kfree(prop->value.str);
|
|
}
|
|
kfree(prop->name);
|
|
}
|
|
|
|
kfree(pset->properties);
|
|
kfree(pset);
|
|
}
|
|
|
|
static int pset_copy_entry(struct property_entry *dst,
|
|
const struct property_entry *src)
|
|
{
|
|
const char **d, **s;
|
|
size_t i, nval;
|
|
|
|
dst->name = kstrdup(src->name, GFP_KERNEL);
|
|
if (!dst->name)
|
|
return -ENOMEM;
|
|
|
|
if (src->is_array) {
|
|
if (!src->length)
|
|
return -ENODATA;
|
|
|
|
if (src->is_string) {
|
|
nval = src->length / sizeof(const char *);
|
|
dst->pointer.str = kcalloc(nval, sizeof(const char *),
|
|
GFP_KERNEL);
|
|
if (!dst->pointer.str)
|
|
return -ENOMEM;
|
|
|
|
d = dst->pointer.str;
|
|
s = src->pointer.str;
|
|
for (i = 0; i < nval; i++) {
|
|
d[i] = kstrdup(s[i], GFP_KERNEL);
|
|
if (!d[i] && s[i])
|
|
return -ENOMEM;
|
|
}
|
|
} else {
|
|
dst->pointer.raw_data = kmemdup(src->pointer.raw_data,
|
|
src->length, GFP_KERNEL);
|
|
if (!dst->pointer.raw_data)
|
|
return -ENOMEM;
|
|
}
|
|
} else if (src->is_string) {
|
|
dst->value.str = kstrdup(src->value.str, GFP_KERNEL);
|
|
if (!dst->value.str && src->value.str)
|
|
return -ENOMEM;
|
|
} else {
|
|
dst->value.raw_data = src->value.raw_data;
|
|
}
|
|
|
|
dst->length = src->length;
|
|
dst->is_array = src->is_array;
|
|
dst->is_string = src->is_string;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pset_copy_set - copies property set
|
|
* @pset: Property set to copy
|
|
*
|
|
* This function takes a deep copy of the given property set and returns
|
|
* pointer to the copy. Call device_free_property_set() to free resources
|
|
* allocated in this function.
|
|
*
|
|
* Return: Pointer to the new property set or error pointer.
|
|
*/
|
|
static struct property_set *pset_copy_set(const struct property_set *pset)
|
|
{
|
|
const struct property_entry *entry;
|
|
struct property_set *p;
|
|
size_t i, n = 0;
|
|
|
|
p = kzalloc(sizeof(*p), GFP_KERNEL);
|
|
if (!p)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
while (pset->properties[n].name)
|
|
n++;
|
|
|
|
p->properties = kcalloc(n + 1, sizeof(*entry), GFP_KERNEL);
|
|
if (!p->properties) {
|
|
kfree(p);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
for (i = 0; i < n; i++) {
|
|
int ret = pset_copy_entry(&p->properties[i],
|
|
&pset->properties[i]);
|
|
if (ret) {
|
|
pset_free_set(p);
|
|
return ERR_PTR(ret);
|
|
}
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
/**
|
|
* device_remove_properties - Remove properties from a device object.
|
|
* @dev: Device whose properties to remove.
|
|
*
|
|
* The function removes properties previously associated to the device
|
|
* secondary 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;
|
|
|
|
fwnode = dev_fwnode(dev);
|
|
if (!fwnode)
|
|
return;
|
|
/*
|
|
* Pick either primary or secondary node depending which one holds
|
|
* the pset. If there is no real firmware node (ACPI/DT) primary
|
|
* will hold the pset.
|
|
*/
|
|
if (is_pset_node(fwnode)) {
|
|
set_primary_fwnode(dev, NULL);
|
|
pset_free_set(to_pset_node(fwnode));
|
|
} else {
|
|
fwnode = fwnode->secondary;
|
|
if (!IS_ERR(fwnode) && is_pset_node(fwnode)) {
|
|
set_secondary_fwnode(dev, NULL);
|
|
pset_free_set(to_pset_node(fwnode));
|
|
}
|
|
}
|
|
}
|
|
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 as its secondary firmware node. The function takes a copy of
|
|
* @properties.
|
|
*/
|
|
int device_add_properties(struct device *dev, struct property_entry *properties)
|
|
{
|
|
struct property_set *p, pset;
|
|
|
|
if (!properties)
|
|
return -EINVAL;
|
|
|
|
pset.properties = properties;
|
|
|
|
p = pset_copy_set(&pset);
|
|
if (IS_ERR(p))
|
|
return PTR_ERR(p);
|
|
|
|
p->fwnode.type = FWNODE_PDATA;
|
|
set_secondary_fwnode(dev, &p->fwnode);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_add_properties);
|
|
|
|
/**
|
|
* device_get_next_child_node - Return the next child node handle for a device
|
|
* @dev: Device to find the next child node for.
|
|
* @child: Handle to one of the device's child nodes or a null handle.
|
|
*/
|
|
struct fwnode_handle *device_get_next_child_node(struct device *dev,
|
|
struct fwnode_handle *child)
|
|
{
|
|
if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
|
|
struct device_node *node;
|
|
|
|
node = of_get_next_available_child(dev->of_node, to_of_node(child));
|
|
if (node)
|
|
return &node->fwnode;
|
|
} else if (IS_ENABLED(CONFIG_ACPI)) {
|
|
return acpi_get_next_subnode(dev, child);
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_get_next_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)
|
|
{
|
|
struct fwnode_handle *child;
|
|
|
|
/*
|
|
* Find first matching named child node of this device.
|
|
* For ACPI this will be a data only sub-node.
|
|
*/
|
|
device_for_each_child_node(dev, child) {
|
|
if (is_of_node(child)) {
|
|
if (!of_node_cmp(to_of_node(child)->name, childname))
|
|
return child;
|
|
} else if (is_acpi_data_node(child)) {
|
|
if (acpi_data_node_match(child, childname))
|
|
return child;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_get_named_child_node);
|
|
|
|
/**
|
|
* fwnode_handle_put - Drop reference to a device node
|
|
* @fwnode: Pointer to the device node to drop the reference to.
|
|
*
|
|
* This has to be used when terminating device_for_each_child_node() iteration
|
|
* with break or return to prevent stale device node references from being left
|
|
* behind.
|
|
*/
|
|
void fwnode_handle_put(struct fwnode_handle *fwnode)
|
|
{
|
|
if (is_of_node(fwnode))
|
|
of_node_put(to_of_node(fwnode));
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_handle_put);
|
|
|
|
/**
|
|
* device_get_child_node_count - return the number of child nodes for device
|
|
* @dev: Device to cound the child nodes for
|
|
*/
|
|
unsigned int device_get_child_node_count(struct device *dev)
|
|
{
|
|
struct fwnode_handle *child;
|
|
unsigned int count = 0;
|
|
|
|
device_for_each_child_node(dev, child)
|
|
count++;
|
|
|
|
return count;
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_get_child_node_count);
|
|
|
|
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);
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
const char *pm;
|
|
int err, i;
|
|
|
|
err = device_property_read_string(dev, "phy-mode", &pm);
|
|
if (err < 0)
|
|
err = device_property_read_string(dev,
|
|
"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(device_get_phy_mode);
|
|
|
|
static void *device_get_mac_addr(struct device *dev,
|
|
const char *name, char *addr,
|
|
int alen)
|
|
{
|
|
int ret = device_property_read_u8_array(dev, name, addr, alen);
|
|
|
|
if (ret == 0 && alen == ETH_ALEN && is_valid_ether_addr(addr))
|
|
return addr;
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*
|
|
* 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 *device_get_mac_address(struct device *dev, char *addr, int alen)
|
|
{
|
|
char *res;
|
|
|
|
res = device_get_mac_addr(dev, "mac-address", addr, alen);
|
|
if (res)
|
|
return res;
|
|
|
|
res = device_get_mac_addr(dev, "local-mac-address", addr, alen);
|
|
if (res)
|
|
return res;
|
|
|
|
return device_get_mac_addr(dev, "address", addr, alen);
|
|
}
|
|
EXPORT_SYMBOL(device_get_mac_address);
|