| /* |
| * ACPI device specific properties support. |
| * |
| * Copyright (C) 2014, Intel Corporation |
| * All rights reserved. |
| * |
| * Authors: Mika Westerberg <mika.westerberg@linux.intel.com> |
| * Darren Hart <dvhart@linux.intel.com> |
| * Rafael J. Wysocki <rafael.j.wysocki@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/device.h> |
| #include <linux/export.h> |
| |
| #include "internal.h" |
| |
| static int acpi_data_get_property_array(struct acpi_device_data *data, |
| const char *name, |
| acpi_object_type type, |
| const union acpi_object **obj); |
| |
| /* ACPI _DSD device properties UUID: daffd814-6eba-4d8c-8a91-bc9bbf4aa301 */ |
| static const u8 prp_uuid[16] = { |
| 0x14, 0xd8, 0xff, 0xda, 0xba, 0x6e, 0x8c, 0x4d, |
| 0x8a, 0x91, 0xbc, 0x9b, 0xbf, 0x4a, 0xa3, 0x01 |
| }; |
| /* ACPI _DSD data subnodes UUID: dbb8e3e6-5886-4ba6-8795-1319f52a966b */ |
| static const u8 ads_uuid[16] = { |
| 0xe6, 0xe3, 0xb8, 0xdb, 0x86, 0x58, 0xa6, 0x4b, |
| 0x87, 0x95, 0x13, 0x19, 0xf5, 0x2a, 0x96, 0x6b |
| }; |
| |
| static bool acpi_enumerate_nondev_subnodes(acpi_handle scope, |
| const union acpi_object *desc, |
| struct acpi_device_data *data); |
| static bool acpi_extract_properties(const union acpi_object *desc, |
| struct acpi_device_data *data); |
| |
| static bool acpi_nondev_subnode_extract(const union acpi_object *desc, |
| acpi_handle handle, |
| const union acpi_object *link, |
| struct list_head *list) |
| { |
| struct acpi_data_node *dn; |
| bool result; |
| |
| dn = kzalloc(sizeof(*dn), GFP_KERNEL); |
| if (!dn) |
| return false; |
| |
| dn->name = link->package.elements[0].string.pointer; |
| dn->fwnode.type = FWNODE_ACPI_DATA; |
| INIT_LIST_HEAD(&dn->data.subnodes); |
| |
| result = acpi_extract_properties(desc, &dn->data); |
| |
| if (handle) { |
| acpi_handle scope; |
| acpi_status status; |
| |
| /* |
| * The scope for the subnode object lookup is the one of the |
| * namespace node (device) containing the object that has |
| * returned the package. That is, it's the scope of that |
| * object's parent. |
| */ |
| status = acpi_get_parent(handle, &scope); |
| if (ACPI_SUCCESS(status) |
| && acpi_enumerate_nondev_subnodes(scope, desc, &dn->data)) |
| result = true; |
| } else if (acpi_enumerate_nondev_subnodes(NULL, desc, &dn->data)) { |
| result = true; |
| } |
| |
| if (result) { |
| dn->handle = handle; |
| dn->data.pointer = desc; |
| list_add_tail(&dn->sibling, list); |
| return true; |
| } |
| |
| kfree(dn); |
| acpi_handle_debug(handle, "Invalid properties/subnodes data, skipping\n"); |
| return false; |
| } |
| |
| static bool acpi_nondev_subnode_data_ok(acpi_handle handle, |
| const union acpi_object *link, |
| struct list_head *list) |
| { |
| struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; |
| acpi_status status; |
| |
| status = acpi_evaluate_object_typed(handle, NULL, NULL, &buf, |
| ACPI_TYPE_PACKAGE); |
| if (ACPI_FAILURE(status)) |
| return false; |
| |
| if (acpi_nondev_subnode_extract(buf.pointer, handle, link, list)) |
| return true; |
| |
| ACPI_FREE(buf.pointer); |
| return false; |
| } |
| |
| static bool acpi_nondev_subnode_ok(acpi_handle scope, |
| const union acpi_object *link, |
| struct list_head *list) |
| { |
| acpi_handle handle; |
| acpi_status status; |
| |
| if (!scope) |
| return false; |
| |
| status = acpi_get_handle(scope, link->package.elements[1].string.pointer, |
| &handle); |
| if (ACPI_FAILURE(status)) |
| return false; |
| |
| return acpi_nondev_subnode_data_ok(handle, link, list); |
| } |
| |
| static int acpi_add_nondev_subnodes(acpi_handle scope, |
| const union acpi_object *links, |
| struct list_head *list) |
| { |
| bool ret = false; |
| int i; |
| |
| for (i = 0; i < links->package.count; i++) { |
| const union acpi_object *link, *desc; |
| acpi_handle handle; |
| bool result; |
| |
| link = &links->package.elements[i]; |
| /* Only two elements allowed. */ |
| if (link->package.count != 2) |
| continue; |
| |
| /* The first one must be a string. */ |
| if (link->package.elements[0].type != ACPI_TYPE_STRING) |
| continue; |
| |
| /* The second one may be a string, a reference or a package. */ |
| switch (link->package.elements[1].type) { |
| case ACPI_TYPE_STRING: |
| result = acpi_nondev_subnode_ok(scope, link, list); |
| break; |
| case ACPI_TYPE_LOCAL_REFERENCE: |
| handle = link->package.elements[1].reference.handle; |
| result = acpi_nondev_subnode_data_ok(handle, link, list); |
| break; |
| case ACPI_TYPE_PACKAGE: |
| desc = &link->package.elements[1]; |
| result = acpi_nondev_subnode_extract(desc, NULL, link, list); |
| break; |
| default: |
| result = false; |
| break; |
| } |
| ret = ret || result; |
| } |
| |
| return ret; |
| } |
| |
| static bool acpi_enumerate_nondev_subnodes(acpi_handle scope, |
| const union acpi_object *desc, |
| struct acpi_device_data *data) |
| { |
| int i; |
| |
| /* Look for the ACPI data subnodes UUID. */ |
| for (i = 0; i < desc->package.count; i += 2) { |
| const union acpi_object *uuid, *links; |
| |
| uuid = &desc->package.elements[i]; |
| links = &desc->package.elements[i + 1]; |
| |
| /* |
| * The first element must be a UUID and the second one must be |
| * a package. |
| */ |
| if (uuid->type != ACPI_TYPE_BUFFER || uuid->buffer.length != 16 |
| || links->type != ACPI_TYPE_PACKAGE) |
| break; |
| |
| if (memcmp(uuid->buffer.pointer, ads_uuid, sizeof(ads_uuid))) |
| continue; |
| |
| return acpi_add_nondev_subnodes(scope, links, &data->subnodes); |
| } |
| |
| return false; |
| } |
| |
| static bool acpi_property_value_ok(const union acpi_object *value) |
| { |
| int j; |
| |
| /* |
| * The value must be an integer, a string, a reference, or a package |
| * whose every element must be an integer, a string, or a reference. |
| */ |
| switch (value->type) { |
| case ACPI_TYPE_INTEGER: |
| case ACPI_TYPE_STRING: |
| case ACPI_TYPE_LOCAL_REFERENCE: |
| return true; |
| |
| case ACPI_TYPE_PACKAGE: |
| for (j = 0; j < value->package.count; j++) |
| switch (value->package.elements[j].type) { |
| case ACPI_TYPE_INTEGER: |
| case ACPI_TYPE_STRING: |
| case ACPI_TYPE_LOCAL_REFERENCE: |
| continue; |
| |
| default: |
| return false; |
| } |
| |
| return true; |
| } |
| return false; |
| } |
| |
| static bool acpi_properties_format_valid(const union acpi_object *properties) |
| { |
| int i; |
| |
| for (i = 0; i < properties->package.count; i++) { |
| const union acpi_object *property; |
| |
| property = &properties->package.elements[i]; |
| /* |
| * Only two elements allowed, the first one must be a string and |
| * the second one has to satisfy certain conditions. |
| */ |
| if (property->package.count != 2 |
| || property->package.elements[0].type != ACPI_TYPE_STRING |
| || !acpi_property_value_ok(&property->package.elements[1])) |
| return false; |
| } |
| return true; |
| } |
| |
| static void acpi_init_of_compatible(struct acpi_device *adev) |
| { |
| const union acpi_object *of_compatible; |
| int ret; |
| |
| ret = acpi_data_get_property_array(&adev->data, "compatible", |
| ACPI_TYPE_STRING, &of_compatible); |
| if (ret) { |
| ret = acpi_dev_get_property(adev, "compatible", |
| ACPI_TYPE_STRING, &of_compatible); |
| if (ret) { |
| if (adev->parent |
| && adev->parent->flags.of_compatible_ok) |
| goto out; |
| |
| return; |
| } |
| } |
| adev->data.of_compatible = of_compatible; |
| |
| out: |
| adev->flags.of_compatible_ok = 1; |
| } |
| |
| static bool acpi_extract_properties(const union acpi_object *desc, |
| struct acpi_device_data *data) |
| { |
| int i; |
| |
| if (desc->package.count % 2) |
| return false; |
| |
| /* Look for the device properties UUID. */ |
| for (i = 0; i < desc->package.count; i += 2) { |
| const union acpi_object *uuid, *properties; |
| |
| uuid = &desc->package.elements[i]; |
| properties = &desc->package.elements[i + 1]; |
| |
| /* |
| * The first element must be a UUID and the second one must be |
| * a package. |
| */ |
| if (uuid->type != ACPI_TYPE_BUFFER || uuid->buffer.length != 16 |
| || properties->type != ACPI_TYPE_PACKAGE) |
| break; |
| |
| if (memcmp(uuid->buffer.pointer, prp_uuid, sizeof(prp_uuid))) |
| continue; |
| |
| /* |
| * We found the matching UUID. Now validate the format of the |
| * package immediately following it. |
| */ |
| if (!acpi_properties_format_valid(properties)) |
| break; |
| |
| data->properties = properties; |
| return true; |
| } |
| |
| return false; |
| } |
| |
| void acpi_init_properties(struct acpi_device *adev) |
| { |
| struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; |
| struct acpi_hardware_id *hwid; |
| acpi_status status; |
| bool acpi_of = false; |
| |
| INIT_LIST_HEAD(&adev->data.subnodes); |
| |
| /* |
| * Check if ACPI_DT_NAMESPACE_HID is present and inthat case we fill in |
| * Device Tree compatible properties for this device. |
| */ |
| list_for_each_entry(hwid, &adev->pnp.ids, list) { |
| if (!strcmp(hwid->id, ACPI_DT_NAMESPACE_HID)) { |
| acpi_of = true; |
| break; |
| } |
| } |
| |
| status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL, &buf, |
| ACPI_TYPE_PACKAGE); |
| if (ACPI_FAILURE(status)) |
| goto out; |
| |
| if (acpi_extract_properties(buf.pointer, &adev->data)) { |
| adev->data.pointer = buf.pointer; |
| if (acpi_of) |
| acpi_init_of_compatible(adev); |
| } |
| if (acpi_enumerate_nondev_subnodes(adev->handle, buf.pointer, &adev->data)) |
| adev->data.pointer = buf.pointer; |
| |
| if (!adev->data.pointer) { |
| acpi_handle_debug(adev->handle, "Invalid _DSD data, skipping\n"); |
| ACPI_FREE(buf.pointer); |
| } |
| |
| out: |
| if (acpi_of && !adev->flags.of_compatible_ok) |
| acpi_handle_info(adev->handle, |
| ACPI_DT_NAMESPACE_HID " requires 'compatible' property\n"); |
| } |
| |
| static void acpi_destroy_nondev_subnodes(struct list_head *list) |
| { |
| struct acpi_data_node *dn, *next; |
| |
| if (list_empty(list)) |
| return; |
| |
| list_for_each_entry_safe_reverse(dn, next, list, sibling) { |
| acpi_destroy_nondev_subnodes(&dn->data.subnodes); |
| wait_for_completion(&dn->kobj_done); |
| list_del(&dn->sibling); |
| ACPI_FREE((void *)dn->data.pointer); |
| kfree(dn); |
| } |
| } |
| |
| void acpi_free_properties(struct acpi_device *adev) |
| { |
| acpi_destroy_nondev_subnodes(&adev->data.subnodes); |
| ACPI_FREE((void *)adev->data.pointer); |
| adev->data.of_compatible = NULL; |
| adev->data.pointer = NULL; |
| adev->data.properties = NULL; |
| } |
| |
| /** |
| * acpi_data_get_property - return an ACPI property with given name |
| * @data: ACPI device deta object to get the property from |
| * @name: Name of the property |
| * @type: Expected property type |
| * @obj: Location to store the property value (if not %NULL) |
| * |
| * Look up a property with @name and store a pointer to the resulting ACPI |
| * object at the location pointed to by @obj if found. |
| * |
| * Callers must not attempt to free the returned objects. These objects will be |
| * freed by the ACPI core automatically during the removal of @data. |
| * |
| * Return: %0 if property with @name has been found (success), |
| * %-EINVAL if the arguments are invalid, |
| * %-EINVAL if the property doesn't exist, |
| * %-EPROTO if the property value type doesn't match @type. |
| */ |
| static int acpi_data_get_property(struct acpi_device_data *data, |
| const char *name, acpi_object_type type, |
| const union acpi_object **obj) |
| { |
| const union acpi_object *properties; |
| int i; |
| |
| if (!data || !name) |
| return -EINVAL; |
| |
| if (!data->pointer || !data->properties) |
| return -EINVAL; |
| |
| properties = data->properties; |
| for (i = 0; i < properties->package.count; i++) { |
| const union acpi_object *propname, *propvalue; |
| const union acpi_object *property; |
| |
| property = &properties->package.elements[i]; |
| |
| propname = &property->package.elements[0]; |
| propvalue = &property->package.elements[1]; |
| |
| if (!strcmp(name, propname->string.pointer)) { |
| if (type != ACPI_TYPE_ANY && propvalue->type != type) |
| return -EPROTO; |
| if (obj) |
| *obj = propvalue; |
| |
| return 0; |
| } |
| } |
| return -EINVAL; |
| } |
| |
| /** |
| * acpi_dev_get_property - return an ACPI property with given name. |
| * @adev: ACPI device to get the property from. |
| * @name: Name of the property. |
| * @type: Expected property type. |
| * @obj: Location to store the property value (if not %NULL). |
| */ |
| int acpi_dev_get_property(struct acpi_device *adev, const char *name, |
| acpi_object_type type, const union acpi_object **obj) |
| { |
| return adev ? acpi_data_get_property(&adev->data, name, type, obj) : -EINVAL; |
| } |
| EXPORT_SYMBOL_GPL(acpi_dev_get_property); |
| |
| static struct acpi_device_data *acpi_device_data_of_node(struct fwnode_handle *fwnode) |
| { |
| if (fwnode->type == FWNODE_ACPI) { |
| struct acpi_device *adev = to_acpi_device_node(fwnode); |
| return &adev->data; |
| } else if (fwnode->type == FWNODE_ACPI_DATA) { |
| struct acpi_data_node *dn = to_acpi_data_node(fwnode); |
| return &dn->data; |
| } |
| return NULL; |
| } |
| |
| /** |
| * acpi_node_prop_get - return an ACPI property with given name. |
| * @fwnode: Firmware node to get the property from. |
| * @propname: Name of the property. |
| * @valptr: Location to store a pointer to the property value (if not %NULL). |
| */ |
| int acpi_node_prop_get(struct fwnode_handle *fwnode, const char *propname, |
| void **valptr) |
| { |
| return acpi_data_get_property(acpi_device_data_of_node(fwnode), |
| propname, ACPI_TYPE_ANY, |
| (const union acpi_object **)valptr); |
| } |
| |
| /** |
| * acpi_data_get_property_array - return an ACPI array property with given name |
| * @adev: ACPI data object to get the property from |
| * @name: Name of the property |
| * @type: Expected type of array elements |
| * @obj: Location to store a pointer to the property value (if not NULL) |
| * |
| * Look up an array property with @name and store a pointer to the resulting |
| * ACPI object at the location pointed to by @obj if found. |
| * |
| * Callers must not attempt to free the returned objects. Those objects will be |
| * freed by the ACPI core automatically during the removal of @data. |
| * |
| * Return: %0 if array property (package) with @name has been found (success), |
| * %-EINVAL if the arguments are invalid, |
| * %-EINVAL if the property doesn't exist, |
| * %-EPROTO if the property is not a package or the type of its elements |
| * doesn't match @type. |
| */ |
| static int acpi_data_get_property_array(struct acpi_device_data *data, |
| const char *name, |
| acpi_object_type type, |
| const union acpi_object **obj) |
| { |
| const union acpi_object *prop; |
| int ret, i; |
| |
| ret = acpi_data_get_property(data, name, ACPI_TYPE_PACKAGE, &prop); |
| if (ret) |
| return ret; |
| |
| if (type != ACPI_TYPE_ANY) { |
| /* Check that all elements are of correct type. */ |
| for (i = 0; i < prop->package.count; i++) |
| if (prop->package.elements[i].type != type) |
| return -EPROTO; |
| } |
| if (obj) |
| *obj = prop; |
| |
| return 0; |
| } |
| |
| /** |
| * __acpi_node_get_property_reference - returns handle to the referenced object |
| * @fwnode: Firmware node to get the property from |
| * @propname: Name of the property |
| * @index: Index of the reference to return |
| * @num_args: Maximum number of arguments after each reference |
| * @args: Location to store the returned reference with optional arguments |
| * |
| * Find property with @name, verifify that it is a package containing at least |
| * one object reference and if so, store the ACPI device object pointer to the |
| * target object in @args->adev. If the reference includes arguments, store |
| * them in the @args->args[] array. |
| * |
| * If there's more than one reference in the property value package, @index is |
| * used to select the one to return. |
| * |
| * It is possible to leave holes in the property value set like in the |
| * example below: |
| * |
| * Package () { |
| * "cs-gpios", |
| * Package () { |
| * ^GPIO, 19, 0, 0, |
| * ^GPIO, 20, 0, 0, |
| * 0, |
| * ^GPIO, 21, 0, 0, |
| * } |
| * } |
| * |
| * Calling this function with index %2 return %-ENOENT and with index %3 |
| * returns the last entry. If the property does not contain any more values |
| * %-ENODATA is returned. The NULL entry must be single integer and |
| * preferably contain value %0. |
| * |
| * Return: %0 on success, negative error code on failure. |
| */ |
| int __acpi_node_get_property_reference(struct fwnode_handle *fwnode, |
| const char *propname, size_t index, size_t num_args, |
| struct acpi_reference_args *args) |
| { |
| const union acpi_object *element, *end; |
| const union acpi_object *obj; |
| struct acpi_device_data *data; |
| struct acpi_device *device; |
| int ret, idx = 0; |
| |
| data = acpi_device_data_of_node(fwnode); |
| if (!data) |
| return -EINVAL; |
| |
| ret = acpi_data_get_property(data, propname, ACPI_TYPE_ANY, &obj); |
| if (ret) |
| return ret; |
| |
| /* |
| * The simplest case is when the value is a single reference. Just |
| * return that reference then. |
| */ |
| if (obj->type == ACPI_TYPE_LOCAL_REFERENCE) { |
| if (index) |
| return -EINVAL; |
| |
| ret = acpi_bus_get_device(obj->reference.handle, &device); |
| if (ret) |
| return ret; |
| |
| args->adev = device; |
| args->nargs = 0; |
| return 0; |
| } |
| |
| /* |
| * If it is not a single reference, then it is a package of |
| * references followed by number of ints as follows: |
| * |
| * Package () { REF, INT, REF, INT, INT } |
| * |
| * The index argument is then used to determine which reference |
| * the caller wants (along with the arguments). |
| */ |
| if (obj->type != ACPI_TYPE_PACKAGE || index >= obj->package.count) |
| return -EPROTO; |
| |
| element = obj->package.elements; |
| end = element + obj->package.count; |
| |
| while (element < end) { |
| u32 nargs, i; |
| |
| if (element->type == ACPI_TYPE_LOCAL_REFERENCE) { |
| ret = acpi_bus_get_device(element->reference.handle, |
| &device); |
| if (ret) |
| return -ENODEV; |
| |
| nargs = 0; |
| element++; |
| |
| /* assume following integer elements are all args */ |
| for (i = 0; element + i < end && i < num_args; i++) { |
| int type = element[i].type; |
| |
| if (type == ACPI_TYPE_INTEGER) |
| nargs++; |
| else if (type == ACPI_TYPE_LOCAL_REFERENCE) |
| break; |
| else |
| return -EPROTO; |
| } |
| |
| if (nargs > MAX_ACPI_REFERENCE_ARGS) |
| return -EPROTO; |
| |
| if (idx == index) { |
| args->adev = device; |
| args->nargs = nargs; |
| for (i = 0; i < nargs; i++) |
| args->args[i] = element[i].integer.value; |
| |
| return 0; |
| } |
| |
| element += nargs; |
| } else if (element->type == ACPI_TYPE_INTEGER) { |
| if (idx == index) |
| return -ENOENT; |
| element++; |
| } else { |
| return -EPROTO; |
| } |
| |
| idx++; |
| } |
| |
| return -ENODATA; |
| } |
| EXPORT_SYMBOL_GPL(__acpi_node_get_property_reference); |
| |
| static int acpi_data_prop_read_single(struct acpi_device_data *data, |
| const char *propname, |
| enum dev_prop_type proptype, void *val) |
| { |
| const union acpi_object *obj; |
| int ret; |
| |
| if (!val) |
| return -EINVAL; |
| |
| if (proptype >= DEV_PROP_U8 && proptype <= DEV_PROP_U64) { |
| ret = acpi_data_get_property(data, propname, ACPI_TYPE_INTEGER, &obj); |
| if (ret) |
| return ret; |
| |
| switch (proptype) { |
| case DEV_PROP_U8: |
| if (obj->integer.value > U8_MAX) |
| return -EOVERFLOW; |
| *(u8 *)val = obj->integer.value; |
| break; |
| case DEV_PROP_U16: |
| if (obj->integer.value > U16_MAX) |
| return -EOVERFLOW; |
| *(u16 *)val = obj->integer.value; |
| break; |
| case DEV_PROP_U32: |
| if (obj->integer.value > U32_MAX) |
| return -EOVERFLOW; |
| *(u32 *)val = obj->integer.value; |
| break; |
| default: |
| *(u64 *)val = obj->integer.value; |
| break; |
| } |
| } else if (proptype == DEV_PROP_STRING) { |
| ret = acpi_data_get_property(data, propname, ACPI_TYPE_STRING, &obj); |
| if (ret) |
| return ret; |
| |
| *(char **)val = obj->string.pointer; |
| } else { |
| ret = -EINVAL; |
| } |
| return ret; |
| } |
| |
| int acpi_dev_prop_read_single(struct acpi_device *adev, const char *propname, |
| enum dev_prop_type proptype, void *val) |
| { |
| return adev ? acpi_data_prop_read_single(&adev->data, propname, proptype, val) : -EINVAL; |
| } |
| |
| static int acpi_copy_property_array_u8(const union acpi_object *items, u8 *val, |
| size_t nval) |
| { |
| int i; |
| |
| for (i = 0; i < nval; i++) { |
| if (items[i].type != ACPI_TYPE_INTEGER) |
| return -EPROTO; |
| if (items[i].integer.value > U8_MAX) |
| return -EOVERFLOW; |
| |
| val[i] = items[i].integer.value; |
| } |
| return 0; |
| } |
| |
| static int acpi_copy_property_array_u16(const union acpi_object *items, |
| u16 *val, size_t nval) |
| { |
| int i; |
| |
| for (i = 0; i < nval; i++) { |
| if (items[i].type != ACPI_TYPE_INTEGER) |
| return -EPROTO; |
| if (items[i].integer.value > U16_MAX) |
| return -EOVERFLOW; |
| |
| val[i] = items[i].integer.value; |
| } |
| return 0; |
| } |
| |
| static int acpi_copy_property_array_u32(const union acpi_object *items, |
| u32 *val, size_t nval) |
| { |
| int i; |
| |
| for (i = 0; i < nval; i++) { |
| if (items[i].type != ACPI_TYPE_INTEGER) |
| return -EPROTO; |
| if (items[i].integer.value > U32_MAX) |
| return -EOVERFLOW; |
| |
| val[i] = items[i].integer.value; |
| } |
| return 0; |
| } |
| |
| static int acpi_copy_property_array_u64(const union acpi_object *items, |
| u64 *val, size_t nval) |
| { |
| int i; |
| |
| for (i = 0; i < nval; i++) { |
| if (items[i].type != ACPI_TYPE_INTEGER) |
| return -EPROTO; |
| |
| val[i] = items[i].integer.value; |
| } |
| return 0; |
| } |
| |
| static int acpi_copy_property_array_string(const union acpi_object *items, |
| char **val, size_t nval) |
| { |
| int i; |
| |
| for (i = 0; i < nval; i++) { |
| if (items[i].type != ACPI_TYPE_STRING) |
| return -EPROTO; |
| |
| val[i] = items[i].string.pointer; |
| } |
| return 0; |
| } |
| |
| static int acpi_data_prop_read(struct acpi_device_data *data, |
| const char *propname, |
| enum dev_prop_type proptype, |
| void *val, size_t nval) |
| { |
| const union acpi_object *obj; |
| const union acpi_object *items; |
| int ret; |
| |
| if (val && nval == 1) { |
| ret = acpi_data_prop_read_single(data, propname, proptype, val); |
| if (!ret) |
| return ret; |
| } |
| |
| ret = acpi_data_get_property_array(data, propname, ACPI_TYPE_ANY, &obj); |
| if (ret) |
| return ret; |
| |
| if (!val) |
| return obj->package.count; |
| |
| if (nval > obj->package.count) |
| return -EOVERFLOW; |
| else if (nval <= 0) |
| return -EINVAL; |
| |
| items = obj->package.elements; |
| |
| switch (proptype) { |
| case DEV_PROP_U8: |
| ret = acpi_copy_property_array_u8(items, (u8 *)val, nval); |
| break; |
| case DEV_PROP_U16: |
| ret = acpi_copy_property_array_u16(items, (u16 *)val, nval); |
| break; |
| case DEV_PROP_U32: |
| ret = acpi_copy_property_array_u32(items, (u32 *)val, nval); |
| break; |
| case DEV_PROP_U64: |
| ret = acpi_copy_property_array_u64(items, (u64 *)val, nval); |
| break; |
| case DEV_PROP_STRING: |
| ret = acpi_copy_property_array_string(items, (char **)val, nval); |
| break; |
| default: |
| ret = -EINVAL; |
| break; |
| } |
| return ret; |
| } |
| |
| int acpi_dev_prop_read(struct acpi_device *adev, const char *propname, |
| enum dev_prop_type proptype, void *val, size_t nval) |
| { |
| return adev ? acpi_data_prop_read(&adev->data, propname, proptype, val, nval) : -EINVAL; |
| } |
| |
| /** |
| * acpi_node_prop_read - retrieve the value of an ACPI property with given name. |
| * @fwnode: Firmware node to get the property from. |
| * @propname: Name of the property. |
| * @proptype: Expected property type. |
| * @val: Location to store the property value (if not %NULL). |
| * @nval: Size of the array pointed to by @val. |
| * |
| * If @val is %NULL, return the number of array elements comprising the value |
| * of the property. Otherwise, read at most @nval values to the array at the |
| * location pointed to by @val. |
| */ |
| int acpi_node_prop_read(struct fwnode_handle *fwnode, const char *propname, |
| enum dev_prop_type proptype, void *val, size_t nval) |
| { |
| return acpi_data_prop_read(acpi_device_data_of_node(fwnode), |
| propname, proptype, val, nval); |
| } |
| |
| /** |
| * acpi_get_next_subnode - 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 *acpi_get_next_subnode(struct device *dev, |
| struct fwnode_handle *child) |
| { |
| struct acpi_device *adev = ACPI_COMPANION(dev); |
| struct list_head *head, *next; |
| |
| if (!adev) |
| return NULL; |
| |
| if (!child || child->type == FWNODE_ACPI) { |
| head = &adev->children; |
| if (list_empty(head)) |
| goto nondev; |
| |
| if (child) { |
| adev = to_acpi_device_node(child); |
| next = adev->node.next; |
| if (next == head) { |
| child = NULL; |
| adev = ACPI_COMPANION(dev); |
| goto nondev; |
| } |
| adev = list_entry(next, struct acpi_device, node); |
| } else { |
| adev = list_first_entry(head, struct acpi_device, node); |
| } |
| return acpi_fwnode_handle(adev); |
| } |
| |
| nondev: |
| if (!child || child->type == FWNODE_ACPI_DATA) { |
| struct acpi_data_node *dn; |
| |
| head = &adev->data.subnodes; |
| if (list_empty(head)) |
| return NULL; |
| |
| if (child) { |
| dn = to_acpi_data_node(child); |
| next = dn->sibling.next; |
| if (next == head) |
| return NULL; |
| |
| dn = list_entry(next, struct acpi_data_node, sibling); |
| } else { |
| dn = list_first_entry(head, struct acpi_data_node, sibling); |
| } |
| return &dn->fwnode; |
| } |
| return NULL; |
| } |