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Merge branches 'device-properties' and 'acpi-misc'

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* device-properties:
  ACPI / property: Allow holes in reference properties

* acpi-misc:
  MAINTAINERS: Add ARM64-specific ACPI maintainers entry
This commit is contained in:
Rafael J. Wysocki 2016-10-14 14:09:57 +02:00
commit 3f62d5269b
3 changed files with 94 additions and 51 deletions
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8
MAINTAINERS
View File

@ -316,6 +316,14 @@ W: https://01.org/linux-acpi
S: Supported
F: drivers/acpi/fan.c
ACPI FOR ARM64 (ACPI/arm64)
M: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
M: Hanjun Guo <hanjun.guo@linaro.org>
M: Sudeep Holla <sudeep.holla@arm.com>
L: linux-acpi@vger.kernel.org
S: Maintained
F: drivers/acpi/arm64
ACPI THERMAL DRIVER
M: Zhang Rui <rui.zhang@intel.com>
L: linux-acpi@vger.kernel.org

115
drivers/acpi/property.c
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@ -468,10 +468,11 @@ static int acpi_data_get_property_array(struct acpi_device_data *data,
}
/**
* acpi_data_get_property_reference - returns handle to the referenced object
* @data: ACPI device data object containing the property
* __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
@ -482,17 +483,40 @@ static int acpi_data_get_property_array(struct acpi_device_data *data,
* 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.
*/
static int acpi_data_get_property_reference(struct acpi_device_data *data,
const char *propname, size_t index,
struct acpi_reference_args *args)
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;
@ -532,59 +556,54 @@ static int acpi_data_get_property_reference(struct acpi_device_data *data,
while (element < end) {
u32 nargs, i;
if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
return -EPROTO;
if (element->type == ACPI_TYPE_LOCAL_REFERENCE) {
ret = acpi_bus_get_device(element->reference.handle,
&device);
if (ret)
return -ENODEV;
ret = acpi_bus_get_device(element->reference.handle, &device);
if (ret)
return -ENODEV;
nargs = 0;
element++;
element++;
nargs = 0;
/* assume following integer elements are all args */
for (i = 0; element + i < end && i < num_args; i++) {
int type = element[i].type;
/* 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 (type == ACPI_TYPE_INTEGER)
nargs++;
else if (type == ACPI_TYPE_LOCAL_REFERENCE)
break;
else
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;
}
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;
idx++;
}
return -EPROTO;
return -ENODATA;
}
/**
* acpi_node_get_property_reference - get a 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.
* @args: Location to store the returned reference with optional arguments.
*/
int acpi_node_get_property_reference(struct fwnode_handle *fwnode,
const char *name, size_t index,
struct acpi_reference_args *args)
{
struct acpi_device_data *data = acpi_device_data_of_node(fwnode);
return data ? acpi_data_get_property_reference(data, name, index, args) : -EINVAL;
}
EXPORT_SYMBOL_GPL(acpi_node_get_property_reference);
EXPORT_SYMBOL_GPL(__acpi_node_get_property_reference);
static int acpi_data_prop_read_single(struct acpi_device_data *data,
const char *propname,

22
include/linux/acpi.h
View File

@ -934,9 +934,17 @@ struct acpi_reference_args {
#ifdef CONFIG_ACPI
int acpi_dev_get_property(struct acpi_device *adev, const char *name,
acpi_object_type type, const union acpi_object **obj);
int acpi_node_get_property_reference(struct fwnode_handle *fwnode,
const char *name, size_t index,
struct acpi_reference_args *args);
int __acpi_node_get_property_reference(struct fwnode_handle *fwnode,
const char *name, size_t index, size_t num_args,
struct acpi_reference_args *args);
static inline int acpi_node_get_property_reference(struct fwnode_handle *fwnode,
const char *name, size_t index,
struct acpi_reference_args *args)
{
return __acpi_node_get_property_reference(fwnode, name, index,
MAX_ACPI_REFERENCE_ARGS, args);
}
int acpi_node_prop_get(struct fwnode_handle *fwnode, const char *propname,
void **valptr);
@ -1012,6 +1020,14 @@ static inline int acpi_dev_get_property(struct acpi_device *adev,
return -ENXIO;
}
static inline int
__acpi_node_get_property_reference(struct fwnode_handle *fwnode,
const char *name, size_t index, size_t num_args,
struct acpi_reference_args *args)
{
return -ENXIO;
}
static inline int acpi_node_get_property_reference(struct fwnode_handle *fwnode,
const char *name, size_t index,
struct acpi_reference_args *args)