diff options
Diffstat (limited to 'drivers/platform/x86/wmi.c')
| -rw-r--r-- | drivers/platform/x86/wmi.c | 104 |
1 files changed, 89 insertions, 15 deletions
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c index d81319a502ef..5b95d7aa5c2f 100644 --- a/drivers/platform/x86/wmi.c +++ b/drivers/platform/x86/wmi.c @@ -248,7 +248,9 @@ static acpi_status get_event_data(const struct wmi_block *wblock, struct acpi_bu * @wdev: A wmi bus device from a driver * @length: Required buffer size * - * Allocates memory needed for buffer, stores the buffer size in that memory + * Allocates memory needed for buffer, stores the buffer size in that memory. + * + * Return: 0 on success or a negative error code for failure. */ int set_required_buffer_size(struct wmi_device *wdev, u64 length) { @@ -262,14 +264,57 @@ int set_required_buffer_size(struct wmi_device *wdev, u64 length) EXPORT_SYMBOL_GPL(set_required_buffer_size); /** - * wmi_evaluate_method - Evaluate a WMI method + * wmi_instance_count - Get number of WMI object instances + * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba + * + * Get the number of WMI object instances. + * + * Returns: Number of WMI object instances or negative error code. + */ +int wmi_instance_count(const char *guid_string) +{ + struct wmi_block *wblock; + acpi_status status; + + status = find_guid(guid_string, &wblock); + if (ACPI_FAILURE(status)) { + if (status == AE_BAD_PARAMETER) + return -EINVAL; + + return -ENODEV; + } + + return wmidev_instance_count(&wblock->dev); +} +EXPORT_SYMBOL_GPL(wmi_instance_count); + +/** + * wmidev_instance_count - Get number of WMI object instances + * @wdev: A wmi bus device from a driver + * + * Get the number of WMI object instances. + * + * Returns: Number of WMI object instances. + */ +u8 wmidev_instance_count(struct wmi_device *wdev) +{ + struct wmi_block *wblock = container_of(wdev, struct wmi_block, dev); + + return wblock->gblock.instance_count; +} +EXPORT_SYMBOL_GPL(wmidev_instance_count); + +/** + * wmi_evaluate_method - Evaluate a WMI method (deprecated) * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba * @instance: Instance index * @method_id: Method ID to call * @in: Buffer containing input for the method call * @out: Empty buffer to return the method results * - * Call an ACPI-WMI method + * Call an ACPI-WMI method, the caller must free @out. + * + * Return: acpi_status signaling success or error. */ acpi_status wmi_evaluate_method(const char *guid_string, u8 instance, u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out) @@ -294,7 +339,9 @@ EXPORT_SYMBOL_GPL(wmi_evaluate_method); * @in: Buffer containing input for the method call * @out: Empty buffer to return the method results * - * Call an ACPI-WMI method + * Call an ACPI-WMI method, the caller must free @out. + * + * Return: acpi_status signaling success or error. */ acpi_status wmidev_evaluate_method(struct wmi_device *wdev, u8 instance, u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out) @@ -411,7 +458,9 @@ static acpi_status __query_block(struct wmi_block *wblock, u8 instance, * @instance: Instance index * @out: Empty buffer to return the contents of the data block to * - * Return the contents of an ACPI-WMI data block to a buffer + * Query a ACPI-WMI block, the caller must free @out. + * + * Return: ACPI object containing the content of the WMI block. */ acpi_status wmi_query_block(const char *guid_string, u8 instance, struct acpi_buffer *out) @@ -427,6 +476,15 @@ acpi_status wmi_query_block(const char *guid_string, u8 instance, } EXPORT_SYMBOL_GPL(wmi_query_block); +/** + * wmidev_block_query - Return contents of a WMI block + * @wdev: A wmi bus device from a driver + * @instance: Instance index + * + * Query an ACPI-WMI block, the caller must free the result. + * + * Return: ACPI object containing the content of the WMI block. + */ union acpi_object *wmidev_block_query(struct wmi_device *wdev, u8 instance) { struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL }; @@ -440,12 +498,14 @@ union acpi_object *wmidev_block_query(struct wmi_device *wdev, u8 instance) EXPORT_SYMBOL_GPL(wmidev_block_query); /** - * wmi_set_block - Write to a WMI block + * wmi_set_block - Write to a WMI block (deprecated) * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba * @instance: Instance index * @in: Buffer containing new values for the data block * - * Write the contents of the input buffer to an ACPI-WMI data block + * Write the contents of the input buffer to an ACPI-WMI data block. + * + * Return: acpi_status signaling success or error. */ acpi_status wmi_set_block(const char *guid_string, u8 instance, const struct acpi_buffer *in) @@ -549,12 +609,14 @@ static void wmi_notify_debug(u32 value, void *context) } /** - * wmi_install_notify_handler - Register handler for WMI events + * wmi_install_notify_handler - Register handler for WMI events (deprecated) * @guid: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba * @handler: Function to handle notifications * @data: Data to be returned to handler when event is fired * * Register a handler for events sent to the ACPI-WMI mapper device. + * + * Return: acpi_status signaling success or error. */ acpi_status wmi_install_notify_handler(const char *guid, wmi_notify_handler handler, @@ -593,10 +655,12 @@ acpi_status wmi_install_notify_handler(const char *guid, EXPORT_SYMBOL_GPL(wmi_install_notify_handler); /** - * wmi_remove_notify_handler - Unregister handler for WMI events + * wmi_remove_notify_handler - Unregister handler for WMI events (deprecated) * @guid: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba * * Unregister handler for events sent to the ACPI-WMI mapper device. + * + * Return: acpi_status signaling success or error. */ acpi_status wmi_remove_notify_handler(const char *guid) { @@ -638,12 +702,14 @@ acpi_status wmi_remove_notify_handler(const char *guid) EXPORT_SYMBOL_GPL(wmi_remove_notify_handler); /** - * wmi_get_event_data - Get WMI data associated with an event + * wmi_get_event_data - Get WMI data associated with an event (deprecated) * * @event: Event to find - * @out: Buffer to hold event data. out->pointer should be freed with kfree() + * @out: Buffer to hold event data * - * Returns extra data associated with an event in WMI. + * Get extra data associated with an WMI event, the caller needs to free @out. + * + * Return: acpi_status signaling success or error. */ acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out) { @@ -664,7 +730,9 @@ EXPORT_SYMBOL_GPL(wmi_get_event_data); * wmi_has_guid - Check if a GUID is available * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba * - * Check if a given GUID is defined by _WDG + * Check if a given GUID is defined by _WDG. + * + * Return: True if GUID is available, false otherwise. */ bool wmi_has_guid(const char *guid_string) { @@ -673,12 +741,12 @@ bool wmi_has_guid(const char *guid_string) EXPORT_SYMBOL_GPL(wmi_has_guid); /** - * wmi_get_acpi_device_uid() - Get _UID name of ACPI device that defines GUID + * wmi_get_acpi_device_uid() - Get _UID name of ACPI device that defines GUID (deprecated) * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba * * Find the _UID of ACPI device associated with this WMI GUID. * - * Return: The ACPI _UID field value or NULL if the WMI GUID was not found + * Return: The ACPI _UID field value or NULL if the WMI GUID was not found. */ char *wmi_get_acpi_device_uid(const char *guid_string) { @@ -1454,6 +1522,12 @@ int __must_check __wmi_driver_register(struct wmi_driver *driver, } EXPORT_SYMBOL(__wmi_driver_register); +/** + * wmi_driver_unregister() - Unregister a WMI driver + * @driver: WMI driver to unregister + * + * Unregisters a WMI driver from the WMI bus. + */ void wmi_driver_unregister(struct wmi_driver *driver) { driver_unregister(&driver->driver); |