| /* |
| * property.c - Unified device property interface. |
| * |
| * Copyright (C) 2014, Intel Corporation |
| * Authors: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
| * Mika Westerberg <mika.westerberg@linux.intel.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/acpi.h> |
| #include <linux/export.h> |
| #include <linux/kernel.h> |
| #include <linux/of.h> |
| #include <linux/of_address.h> |
| #include <linux/property.h> |
| #include <linux/etherdevice.h> |
| #include <linux/phy.h> |
| |
| struct property_set { |
| struct fwnode_handle fwnode; |
| struct property_entry *properties; |
| }; |
| |
| static inline bool is_pset_node(struct fwnode_handle *fwnode) |
| { |
| return !IS_ERR_OR_NULL(fwnode) && fwnode->type == FWNODE_PDATA; |
| } |
| |
| static inline struct property_set *to_pset_node(struct fwnode_handle *fwnode) |
| { |
| return is_pset_node(fwnode) ? |
| container_of(fwnode, struct property_set, fwnode) : NULL; |
| } |
| |
| static struct property_entry *pset_prop_get(struct property_set *pset, |
| const char *name) |
| { |
| struct property_entry *prop; |
| |
| if (!pset || !pset->properties) |
| return NULL; |
| |
| for (prop = pset->properties; prop->name; prop++) |
| if (!strcmp(name, prop->name)) |
| return prop; |
| |
| return NULL; |
| } |
| |
| static void *pset_prop_find(struct property_set *pset, const char *propname, |
| size_t length) |
| { |
| struct property_entry *prop; |
| void *pointer; |
| |
| prop = pset_prop_get(pset, propname); |
| if (!prop) |
| return ERR_PTR(-EINVAL); |
| if (prop->is_array) |
| pointer = prop->pointer.raw_data; |
| else |
| pointer = &prop->value.raw_data; |
| if (!pointer) |
| return ERR_PTR(-ENODATA); |
| if (length > prop->length) |
| return ERR_PTR(-EOVERFLOW); |
| return pointer; |
| } |
| |
| static int pset_prop_read_u8_array(struct property_set *pset, |
| const char *propname, |
| u8 *values, size_t nval) |
| { |
| void *pointer; |
| size_t length = nval * sizeof(*values); |
| |
| pointer = pset_prop_find(pset, propname, length); |
| if (IS_ERR(pointer)) |
| return PTR_ERR(pointer); |
| |
| memcpy(values, pointer, length); |
| return 0; |
| } |
| |
| static int pset_prop_read_u16_array(struct property_set *pset, |
| const char *propname, |
| u16 *values, size_t nval) |
| { |
| void *pointer; |
| size_t length = nval * sizeof(*values); |
| |
| pointer = pset_prop_find(pset, propname, length); |
| if (IS_ERR(pointer)) |
| return PTR_ERR(pointer); |
| |
| memcpy(values, pointer, length); |
| return 0; |
| } |
| |
| static int pset_prop_read_u32_array(struct property_set *pset, |
| const char *propname, |
| u32 *values, size_t nval) |
| { |
| void *pointer; |
| size_t length = nval * sizeof(*values); |
| |
| pointer = pset_prop_find(pset, propname, length); |
| if (IS_ERR(pointer)) |
| return PTR_ERR(pointer); |
| |
| memcpy(values, pointer, length); |
| return 0; |
| } |
| |
| static int pset_prop_read_u64_array(struct property_set *pset, |
| const char *propname, |
| u64 *values, size_t nval) |
| { |
| void *pointer; |
| size_t length = nval * sizeof(*values); |
| |
| pointer = pset_prop_find(pset, propname, length); |
| if (IS_ERR(pointer)) |
| return PTR_ERR(pointer); |
| |
| memcpy(values, pointer, length); |
| return 0; |
| } |
| |
| static int pset_prop_count_elems_of_size(struct property_set *pset, |
| const char *propname, size_t length) |
| { |
| struct property_entry *prop; |
| |
| prop = pset_prop_get(pset, propname); |
| if (!prop) |
| return -EINVAL; |
| |
| return prop->length / length; |
| } |
| |
| static int pset_prop_read_string_array(struct property_set *pset, |
| const char *propname, |
| const char **strings, size_t nval) |
| { |
| void *pointer; |
| size_t length = nval * sizeof(*strings); |
| |
| pointer = pset_prop_find(pset, propname, length); |
| if (IS_ERR(pointer)) |
| return PTR_ERR(pointer); |
| |
| memcpy(strings, pointer, length); |
| return 0; |
| } |
| |
| static int pset_prop_read_string(struct property_set *pset, |
| const char *propname, const char **strings) |
| { |
| struct property_entry *prop; |
| const char **pointer; |
| |
| prop = pset_prop_get(pset, propname); |
| if (!prop) |
| return -EINVAL; |
| if (!prop->is_string) |
| return -EILSEQ; |
| if (prop->is_array) { |
| pointer = prop->pointer.str; |
| if (!pointer) |
| return -ENODATA; |
| } else { |
| pointer = &prop->value.str; |
| if (*pointer && strnlen(*pointer, prop->length) >= prop->length) |
| return -EILSEQ; |
| } |
| |
| *strings = *pointer; |
| return 0; |
| } |
| |
| static inline struct fwnode_handle *dev_fwnode(struct device *dev) |
| { |
| return IS_ENABLED(CONFIG_OF) && dev->of_node ? |
| &dev->of_node->fwnode : dev->fwnode; |
| } |
| |
| /** |
| * device_property_present - check if a property of a device is present |
| * @dev: Device whose property is being checked |
| * @propname: Name of the property |
| * |
| * Check if property @propname is present in the device firmware description. |
| */ |
| bool device_property_present(struct device *dev, const char *propname) |
| { |
| return fwnode_property_present(dev_fwnode(dev), propname); |
| } |
| EXPORT_SYMBOL_GPL(device_property_present); |
| |
| static bool __fwnode_property_present(struct fwnode_handle *fwnode, |
| const char *propname) |
| { |
| if (is_of_node(fwnode)) |
| return of_property_read_bool(to_of_node(fwnode), propname); |
| else if (is_acpi_node(fwnode)) |
| return !acpi_node_prop_get(fwnode, propname, NULL); |
| else if (is_pset_node(fwnode)) |
| return !!pset_prop_get(to_pset_node(fwnode), propname); |
| return false; |
| } |
| |
| /** |
| * fwnode_property_present - check if a property of a firmware node is present |
| * @fwnode: Firmware node whose property to check |
| * @propname: Name of the property |
| */ |
| bool fwnode_property_present(struct fwnode_handle *fwnode, const char *propname) |
| { |
| bool ret; |
| |
| ret = __fwnode_property_present(fwnode, propname); |
| if (ret == false && !IS_ERR_OR_NULL(fwnode) && |
| !IS_ERR_OR_NULL(fwnode->secondary)) |
| ret = __fwnode_property_present(fwnode->secondary, propname); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(fwnode_property_present); |
| |
| /** |
| * device_property_read_u8_array - return a u8 array property of a device |
| * @dev: Device 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 |
| * |
| * Function reads an array of u8 properties with @propname from the device |
| * firmware description and stores 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 device_property_read_u8_array(struct device *dev, const char *propname, |
| u8 *val, size_t nval) |
| { |
| return fwnode_property_read_u8_array(dev_fwnode(dev), propname, val, nval); |
| } |
| EXPORT_SYMBOL_GPL(device_property_read_u8_array); |
| |
| /** |
| * device_property_read_u16_array - return a u16 array property of a device |
| * @dev: Device 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 |
| * |
| * Function reads an array of u16 properties with @propname from the device |
| * firmware description and stores 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 device_property_read_u16_array(struct device *dev, const char *propname, |
| u16 *val, size_t nval) |
| { |
| return fwnode_property_read_u16_array(dev_fwnode(dev), propname, val, nval); |
| } |
| EXPORT_SYMBOL_GPL(device_property_read_u16_array); |
| |
| /** |
| * device_property_read_u32_array - return a u32 array property of a device |
| * @dev: Device 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 |
| * |
| * Function reads an array of u32 properties with @propname from the device |
| * firmware description and stores 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 device_property_read_u32_array(struct device *dev, const char *propname, |
| u32 *val, size_t nval) |
| { |
| return fwnode_property_read_u32_array(dev_fwnode(dev), propname, val, nval); |
| } |
| EXPORT_SYMBOL_GPL(device_property_read_u32_array); |
| |
| /** |
| * device_property_read_u64_array - return a u64 array property of a device |
| * @dev: Device 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 |
| * |
| * Function reads an array of u64 properties with @propname from the device |
| * firmware description and stores 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 device_property_read_u64_array(struct device *dev, const char *propname, |
| u64 *val, size_t nval) |
| { |
| return fwnode_property_read_u64_array(dev_fwnode(dev), propname, val, nval); |
| } |
| EXPORT_SYMBOL_GPL(device_property_read_u64_array); |
| |
| /** |
| * device_property_read_string_array - return a string array property of device |
| * @dev: Device 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 |
| * |
| * Function reads an array of string properties with @propname from the device |
| * firmware description and stores 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 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 device_property_read_string_array(struct device *dev, const char *propname, |
| const char **val, size_t nval) |
| { |
| return fwnode_property_read_string_array(dev_fwnode(dev), propname, val, nval); |
| } |
| EXPORT_SYMBOL_GPL(device_property_read_string_array); |
| |
| /** |
| * device_property_read_string - return a string property of a device |
| * @dev: Device to get the property of |
| * @propname: Name of the property |
| * @val: The value is stored here |
| * |
| * Function reads property @propname from the device firmware description and |
| * stores 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 type is not a string. |
| * %-ENXIO if no suitable firmware interface is present. |
| */ |
| int device_property_read_string(struct device *dev, const char *propname, |
| const char **val) |
| { |
| return fwnode_property_read_string(dev_fwnode(dev), propname, val); |
| } |
| EXPORT_SYMBOL_GPL(device_property_read_string); |
| |
| /** |
| * device_property_match_string - find a string in an array and return index |
| * @dev: Device 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 device_property_match_string(struct device *dev, const char *propname, |
| const char *string) |
| { |
| return fwnode_property_match_string(dev_fwnode(dev), propname, string); |
| } |
| EXPORT_SYMBOL_GPL(device_property_match_string); |
| |
| #define OF_DEV_PROP_READ_ARRAY(node, propname, type, val, nval) \ |
| (val) ? of_property_read_##type##_array((node), (propname), (val), (nval)) \ |
| : of_property_count_elems_of_size((node), (propname), sizeof(type)) |
| |
| #define PSET_PROP_READ_ARRAY(node, propname, type, val, nval) \ |
| (val) ? pset_prop_read_##type##_array((node), (propname), (val), (nval)) \ |
| : pset_prop_count_elems_of_size((node), (propname), sizeof(type)) |
| |
| #define FWNODE_PROP_READ(_fwnode_, _propname_, _type_, _proptype_, _val_, _nval_) \ |
| ({ \ |
| int _ret_; \ |
| if (is_of_node(_fwnode_)) \ |
| _ret_ = OF_DEV_PROP_READ_ARRAY(to_of_node(_fwnode_), _propname_, \ |
| _type_, _val_, _nval_); \ |
| else if (is_acpi_node(_fwnode_)) \ |
| _ret_ = acpi_node_prop_read(_fwnode_, _propname_, _proptype_, \ |
| _val_, _nval_); \ |
| else if (is_pset_node(_fwnode_)) \ |
| _ret_ = PSET_PROP_READ_ARRAY(to_pset_node(_fwnode_), _propname_, \ |
| _type_, _val_, _nval_); \ |
| else \ |
| _ret_ = -ENXIO; \ |
| _ret_; \ |
| }) |
| |
| #define FWNODE_PROP_READ_ARRAY(_fwnode_, _propname_, _type_, _proptype_, _val_, _nval_) \ |
| ({ \ |
| int _ret_; \ |
| _ret_ = FWNODE_PROP_READ(_fwnode_, _propname_, _type_, _proptype_, \ |
| _val_, _nval_); \ |
| if (_ret_ == -EINVAL && !IS_ERR_OR_NULL(_fwnode_) && \ |
| !IS_ERR_OR_NULL(_fwnode_->secondary)) \ |
| _ret_ = FWNODE_PROP_READ(_fwnode_->secondary, _propname_, _type_, \ |
| _proptype_, _val_, _nval_); \ |
| _ret_; \ |
| }) |
| |
| /** |
| * fwnode_property_read_u8_array - return a u8 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 u8 properties with @propname from @fwnode and stores 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_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); |
| |
| /** |
| * 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); |