int acpi_dev_prop_read_single(struct acpi_device *adev, 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_dev_get_property(adev, 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_dev_get_property(adev, propname, ACPI_TYPE_STRING, &obj);
if (ret)
return ret;
*(char **)val = obj->string.pointer;
} else {
ret = -EINVAL;
}
return ret;
}
static acpi_status acpi_register_phy(acpi_handle handle, u32 lvl,
void *context, void **ret)
{
struct mii_bus *mdio = context;
struct acpi_device *adev;
struct phy_device *phy_dev;
const union acpi_object *obj;
u32 phy_addr;
if (acpi_bus_get_device(handle, &adev))
return AE_OK;
if (acpi_dev_get_property(adev, "phy-channel", ACPI_TYPE_INTEGER, &obj))
return AE_OK;
phy_addr = obj->integer.value;
phy_dev = xgene_enet_phy_register(mdio, phy_addr);
adev->driver_data = phy_dev;
return AE_OK;
}
/**
* acpi_dev_get_property_array - return an ACPI array property with given name
* @adev: ACPI device to get property
* @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 @adev.
*
* Return: %0 if array property (package) with @name has been found (success),
* %-EINVAL if the arguments are invalid,
* %-ENODATA if the property doesn't exist,
* %-EPROTO if the property is not a package or the type of its elements
* doesn't match @type.
*/
int acpi_dev_get_property_array(struct acpi_device *adev, const char *name,
acpi_object_type type,
const union acpi_object **obj)
{
const union acpi_object *prop;
int ret, i;
ret = acpi_dev_get_property(adev, 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;
}
int acpi_dev_prop_get(struct acpi_device *adev, const char *propname,
void **valptr)
{
return acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
(const union acpi_object **)valptr);
}
/**
* acpi_dev_get_property_reference - returns handle to the referenced object
* @adev: ACPI device to get property
* @name: Name of the property
* @size_prop: Name of the "size" property in referenced object
* @index: Index of the reference to return
* @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 (@size_prop is not %NULL) follow the
* reference and check whether or not there is an integer property @size_prop
* under the target object and if so, whether or not its value matches the
* number of arguments that follow the reference. If there's more than one
* reference in the property value package, @index is used to select the one to
* return.
*
* Return: %0 on success, negative error code on failure.
*/
int acpi_dev_get_property_reference(struct acpi_device *adev, const char *name,
const char *size_prop, size_t index,
struct acpi_reference_args *args)
{
const union acpi_object *element, *end;
const union acpi_object *obj;
struct acpi_device *device;
int ret, idx = 0;
ret = acpi_dev_get_property(adev, name, 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 (size_prop || 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)
return -EPROTO;
ret = acpi_bus_get_device(element->reference.handle, &device);
if (ret)
return -ENODEV;
element++;
nargs = 0;
if (size_prop) {
const union acpi_object *prop;
/*
* Find out how many arguments the refenced object
* expects by reading its size_prop property.
*/
ret = acpi_dev_get_property(device, size_prop,
ACPI_TYPE_INTEGER, &prop);
if (ret)
return ret;
nargs = prop->integer.value;
if (nargs > MAX_ACPI_REFERENCE_ARGS
|| element + nargs > end)
return -EPROTO;
/*
* Skip to the start of the arguments and verify
* that they all are in fact integers.
*/
for (i = 0; i < nargs; i++)
if (element[i].type != ACPI_TYPE_INTEGER)
return -EPROTO;
} else {
/* assume following integer elements are all args */
for (i = 0; element + i < end; i++) {
int type = element[i].type;
if (type == ACPI_TYPE_INTEGER)
nargs++;
else if (type == ACPI_TYPE_LOCAL_REFERENCE)
break;
else
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;
}
return -EPROTO;
}
