diff options
| -rw-r--r-- | MAINTAINERS | 8 | ||||
| -rw-r--r-- | drivers/acpi/property.c | 117 | ||||
| -rw-r--r-- | include/linux/acpi.h | 22 |
3 files changed, 95 insertions, 52 deletions
diff --git a/MAINTAINERS b/MAINTAINERS index c8926c1acd22..46c526eb1bab 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -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 diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c index f2fd3fee588a..03f5ec11ab31 100644 --- a/drivers/acpi/property.c +++ b/drivers/acpi/property.c @@ -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; - - ret = acpi_bus_get_device(element->reference.handle, &device); - if (ret) - return -ENODEV; - - element++; - nargs = 0; - - /* assume following integer elements are all args */ - for (i = 0; element + i < end; i++) { - int type = element[i].type; + 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 (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; + if (idx == index) { + args->adev = device; + args->nargs = nargs; + for (i = 0; i < nargs; i++) + args->args[i] = element[i].integer.value; - return 0; + return 0; + } + + element += nargs; + } else if (element->type == ACPI_TYPE_INTEGER) { + if (idx == index) + return -ENOENT; + element++; + } else { + return -EPROTO; } - element += nargs; + idx++; } - return -EPROTO; -} - -/** - * 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; + return -ENODATA; } -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, diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 65932c08afd2..2d42fb7d56b7 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -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) |