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![Sakari Ailus](/assets/img/avatar_default.png)
The fwnode_handle_get() function is used to obtain a reference to an fwnode. A common usage pattern for the OF equivalent of the function is: mynode = of_node_get(node); Similarly make fwnode_handle_get() return the fwnode to which the reference was obtained. Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1342 lines
40 KiB
C
1342 lines
40 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/of_graph.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 device *dev;
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struct fwnode_handle fwnode;
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const struct property_entry *properties;
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};
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static const struct fwnode_operations pset_fwnode_ops;
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static inline bool is_pset_node(const struct fwnode_handle *fwnode)
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{
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return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &pset_fwnode_ops;
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}
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#define to_pset_node(__fwnode) \
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({ \
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typeof(__fwnode) __to_pset_node_fwnode = __fwnode; \
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\
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is_pset_node(__to_pset_node_fwnode) ? \
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container_of(__to_pset_node_fwnode, \
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struct property_set, fwnode) : \
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NULL; \
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})
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static const struct property_entry *
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pset_prop_get(const struct property_set *pset, const char *name)
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{
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const 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 const void *pset_prop_find(const struct property_set *pset,
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const char *propname, size_t length)
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{
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const struct property_entry *prop;
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const 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(const 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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const 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(const 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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const 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(const 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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const 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(const 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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const 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(const struct property_set *pset,
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const char *propname, size_t length)
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{
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const 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(const 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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const struct property_entry *prop;
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const void *pointer;
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size_t array_len, length;
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/* Find out the array length. */
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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_array)
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/* The array length for a non-array string property is 1. */
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array_len = 1;
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else
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/* Find the length of an array. */
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array_len = pset_prop_count_elems_of_size(pset, propname,
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sizeof(const char *));
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/* Return how many there are if strings is NULL. */
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if (!strings)
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return array_len;
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array_len = min(nval, array_len);
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length = array_len * 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 array_len;
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}
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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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static bool pset_fwnode_property_present(const struct fwnode_handle *fwnode,
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const char *propname)
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{
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return !!pset_prop_get(to_pset_node(fwnode), propname);
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}
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static int pset_fwnode_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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const struct property_set *node = to_pset_node(fwnode);
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if (!val)
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return pset_prop_count_elems_of_size(node, propname, elem_size);
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switch (elem_size) {
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case sizeof(u8):
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return pset_prop_read_u8_array(node, propname, val, nval);
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case sizeof(u16):
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return pset_prop_read_u16_array(node, propname, val, nval);
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case sizeof(u32):
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return pset_prop_read_u32_array(node, propname, val, nval);
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case sizeof(u64):
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return pset_prop_read_u64_array(node, propname, val, nval);
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}
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return -ENXIO;
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}
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static int
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pset_fwnode_property_read_string_array(const struct fwnode_handle *fwnode,
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const char *propname,
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const char **val, size_t nval)
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{
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return pset_prop_read_string_array(to_pset_node(fwnode), propname,
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val, nval);
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}
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static const struct fwnode_operations pset_fwnode_ops = {
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.property_present = pset_fwnode_property_present,
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.property_read_int_array = pset_fwnode_read_int_array,
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.property_read_string_array = pset_fwnode_property_read_string_array,
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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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/**
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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,
|
|
* %-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_u8_array(const struct fwnode_handle *fwnode,
|
|
const char *propname, u8 *val, size_t nval)
|
|
{
|
|
return fwnode_property_read_int_array(fwnode, propname, sizeof(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(const struct fwnode_handle *fwnode,
|
|
const char *propname, u16 *val, size_t nval)
|
|
{
|
|
return fwnode_property_read_int_array(fwnode, propname, sizeof(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(const struct fwnode_handle *fwnode,
|
|
const char *propname, u32 *val, size_t nval)
|
|
{
|
|
return fwnode_property_read_int_array(fwnode, propname, sizeof(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(const struct fwnode_handle *fwnode,
|
|
const char *propname, u64 *val, size_t nval)
|
|
{
|
|
return fwnode_property_read_int_array(fwnode, propname, sizeof(u64),
|
|
val, nval);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_property_read_u64_array);
|
|
|
|
/**
|
|
* 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 read on success if @val is non-NULL,
|
|
* number of values available on success if @val is NULL,
|
|
* %-EINVAL if given arguments are not valid,
|
|
* %-ENODATA if the property does not have a value,
|
|
* %-EPROTO or %-EILSEQ if the property is not an array of strings,
|
|
* %-EOVERFLOW if the size of the property is not as expected,
|
|
* %-ENXIO if no suitable firmware interface is present.
|
|
*/
|
|
int fwnode_property_read_string_array(const struct fwnode_handle *fwnode,
|
|
const char *propname, const char **val,
|
|
size_t nval)
|
|
{
|
|
int ret;
|
|
|
|
ret = fwnode_call_int_op(fwnode, property_read_string_array, propname,
|
|
val, nval);
|
|
if (ret == -EINVAL && !IS_ERR_OR_NULL(fwnode) &&
|
|
!IS_ERR_OR_NULL(fwnode->secondary))
|
|
ret = fwnode_call_int_op(fwnode->secondary,
|
|
property_read_string_array, 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(const struct fwnode_handle *fwnode,
|
|
const char *propname, const char **val)
|
|
{
|
|
int ret = fwnode_property_read_string_array(fwnode, propname, val, 1);
|
|
|
|
return ret < 0 ? ret : 0;
|
|
}
|
|
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(const 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);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
static int property_copy_string_array(struct property_entry *dst,
|
|
const struct property_entry *src)
|
|
{
|
|
char **d;
|
|
size_t nval = src->length / sizeof(*d);
|
|
int i;
|
|
|
|
d = kcalloc(nval, sizeof(*d), GFP_KERNEL);
|
|
if (!d)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < nval; i++) {
|
|
d[i] = kstrdup(src->pointer.str[i], GFP_KERNEL);
|
|
if (!d[i] && src->pointer.str[i]) {
|
|
while (--i >= 0)
|
|
kfree(d[i]);
|
|
kfree(d);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
dst->pointer.raw_data = d;
|
|
return 0;
|
|
}
|
|
|
|
static int property_entry_copy_data(struct property_entry *dst,
|
|
const struct property_entry *src)
|
|
{
|
|
int error;
|
|
|
|
dst->name = kstrdup(src->name, GFP_KERNEL);
|
|
if (!dst->name)
|
|
return -ENOMEM;
|
|
|
|
if (src->is_array) {
|
|
if (!src->length) {
|
|
error = -ENODATA;
|
|
goto out_free_name;
|
|
}
|
|
|
|
if (src->is_string) {
|
|
error = property_copy_string_array(dst, src);
|
|
if (error)
|
|
goto out_free_name;
|
|
} else {
|
|
dst->pointer.raw_data = kmemdup(src->pointer.raw_data,
|
|
src->length, GFP_KERNEL);
|
|
if (!dst->pointer.raw_data) {
|
|
error = -ENOMEM;
|
|
goto out_free_name;
|
|
}
|
|
}
|
|
} else if (src->is_string) {
|
|
dst->value.str = kstrdup(src->value.str, GFP_KERNEL);
|
|
if (!dst->value.str && src->value.str) {
|
|
error = -ENOMEM;
|
|
goto out_free_name;
|
|
}
|
|
} 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;
|
|
|
|
out_free_name:
|
|
kfree(dst->name);
|
|
return error;
|
|
}
|
|
|
|
static void property_entry_free_data(const struct property_entry *p)
|
|
{
|
|
size_t i, nval;
|
|
|
|
if (p->is_array) {
|
|
if (p->is_string && p->pointer.str) {
|
|
nval = p->length / sizeof(const char *);
|
|
for (i = 0; i < nval; i++)
|
|
kfree(p->pointer.str[i]);
|
|
}
|
|
kfree(p->pointer.raw_data);
|
|
} else if (p->is_string) {
|
|
kfree(p->value.str);
|
|
}
|
|
kfree(p->name);
|
|
}
|
|
|
|
/**
|
|
* property_entries_dup - duplicate array of properties
|
|
* @properties: array of properties to copy
|
|
*
|
|
* This function creates a deep copy of the given NULL-terminated array
|
|
* of property entries.
|
|
*/
|
|
struct property_entry *
|
|
property_entries_dup(const struct property_entry *properties)
|
|
{
|
|
struct property_entry *p;
|
|
int i, n = 0;
|
|
|
|
while (properties[n].name)
|
|
n++;
|
|
|
|
p = kcalloc(n + 1, sizeof(*p), GFP_KERNEL);
|
|
if (!p)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
for (i = 0; i < n; i++) {
|
|
int ret = property_entry_copy_data(&p[i], &properties[i]);
|
|
if (ret) {
|
|
while (--i >= 0)
|
|
property_entry_free_data(&p[i]);
|
|
kfree(p);
|
|
return ERR_PTR(ret);
|
|
}
|
|
}
|
|
|
|
return p;
|
|
}
|
|
EXPORT_SYMBOL_GPL(property_entries_dup);
|
|
|
|
/**
|
|
* property_entries_free - free previously allocated array of properties
|
|
* @properties: array of properties to destroy
|
|
*
|
|
* This function frees given NULL-terminated array of property entries,
|
|
* along with their data.
|
|
*/
|
|
void property_entries_free(const struct property_entry *properties)
|
|
{
|
|
const struct property_entry *p;
|
|
|
|
for (p = properties; p->name; p++)
|
|
property_entry_free_data(p);
|
|
|
|
kfree(properties);
|
|
}
|
|
EXPORT_SYMBOL_GPL(property_entries_free);
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
if (!pset)
|
|
return;
|
|
|
|
property_entries_free(pset->properties);
|
|
kfree(pset);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
struct property_entry *properties;
|
|
struct property_set *p;
|
|
|
|
p = kzalloc(sizeof(*p), GFP_KERNEL);
|
|
if (!p)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
properties = property_entries_dup(pset->properties);
|
|
if (IS_ERR(properties)) {
|
|
kfree(p);
|
|
return ERR_CAST(properties);
|
|
}
|
|
|
|
p->properties = properties;
|
|
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;
|
|
struct property_set *pset;
|
|
|
|
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.
|
|
*/
|
|
pset = to_pset_node(fwnode);
|
|
if (pset) {
|
|
set_primary_fwnode(dev, NULL);
|
|
} else {
|
|
pset = to_pset_node(fwnode->secondary);
|
|
if (pset && dev == pset->dev)
|
|
set_secondary_fwnode(dev, NULL);
|
|
}
|
|
if (pset && dev == pset->dev)
|
|
pset_free_set(pset);
|
|
}
|
|
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,
|
|
const 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.ops = &pset_fwnode_ops;
|
|
set_secondary_fwnode(dev, &p->fwnode);
|
|
p->dev = dev;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_add_properties);
|
|
|
|
/**
|
|
* 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_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_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);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* device_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_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);
|