X86 platform wmi: Introduce debug param to log all WMI events
To give people easily an idea what could be WMI driven on their system. Introduces: wmi.debug=[01] Tested on an acer: ACPI: WMI: DEBUG Event INTEGER_TYPE - 65535 Situation where a driver registers for specific event and debug handler gets overridden and set again if the registering driver gets unloaded again is untested, but should work. Signed-off-by: Thomas Renninger <trenn@suse.de> CC: platform-driver-x86@vger.kernel.org CC: mjg59@srcf.ucam.org CC: corentin.chary@gmail.com Signed-off-by: Carlos Corbacho <carlos@strangeworlds.co.uk> Signed-off-by: Matthew Garrett <mjg@redhat.com>
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@ -81,6 +81,11 @@ static struct wmi_block wmi_blocks;
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#define ACPI_WMI_STRING 0x4 /* GUID takes & returns a string */
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#define ACPI_WMI_EVENT 0x8 /* GUID is an event */
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static int debug_event;
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module_param(debug_event, bool, 0444);
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MODULE_PARM_DESC(debug_event,
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"Log WMI Events [0/1]");
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static int acpi_wmi_remove(struct acpi_device *device, int type);
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static int acpi_wmi_add(struct acpi_device *device);
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static void acpi_wmi_notify(struct acpi_device *device, u32 event);
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@ -477,6 +482,37 @@ const struct acpi_buffer *in)
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}
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EXPORT_SYMBOL_GPL(wmi_set_block);
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static void wmi_notify_debug(u32 value, void *context)
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{
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struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *obj;
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wmi_get_event_data(value, &response);
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obj = (union acpi_object *)response.pointer;
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if (!obj)
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return;
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printk(KERN_INFO PREFIX "DEBUG Event ");
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switch(obj->type) {
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case ACPI_TYPE_BUFFER:
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printk("BUFFER_TYPE - length %d\n", obj->buffer.length);
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break;
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case ACPI_TYPE_STRING:
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printk("STRING_TYPE - %s\n", obj->string.pointer);
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break;
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case ACPI_TYPE_INTEGER:
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printk("INTEGER_TYPE - %llu\n", obj->integer.value);
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break;
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case ACPI_TYPE_PACKAGE:
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printk("PACKAGE_TYPE - %d elements\n", obj->package.count);
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break;
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default:
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printk("object type 0x%X\n", obj->type);
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}
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}
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/**
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* wmi_install_notify_handler - Register handler for WMI events
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* @handler: Function to handle notifications
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@ -496,7 +532,7 @@ wmi_notify_handler handler, void *data)
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if (!find_guid(guid, &block))
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return AE_NOT_EXIST;
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if (block->handler)
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if (block->handler && block->handler != wmi_notify_debug)
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return AE_ALREADY_ACQUIRED;
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block->handler = handler;
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@ -516,7 +552,7 @@ EXPORT_SYMBOL_GPL(wmi_install_notify_handler);
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acpi_status wmi_remove_notify_handler(const char *guid)
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{
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struct wmi_block *block;
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acpi_status status;
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acpi_status status = AE_OK;
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if (!guid)
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return AE_BAD_PARAMETER;
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@ -524,14 +560,16 @@ acpi_status wmi_remove_notify_handler(const char *guid)
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if (!find_guid(guid, &block))
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return AE_NOT_EXIST;
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if (!block->handler)
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if (!block->handler || block->handler == wmi_notify_debug)
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return AE_NULL_ENTRY;
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if (debug_event) {
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block->handler = wmi_notify_debug;
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} else {
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status = wmi_method_enable(block, 0);
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block->handler = NULL;
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block->handler_data = NULL;
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}
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return status;
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}
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EXPORT_SYMBOL_GPL(wmi_remove_notify_handler);
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@ -780,6 +818,10 @@ static __init acpi_status parse_wdg(acpi_handle handle)
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wblock->gblock = gblock[i];
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wblock->handle = handle;
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if (debug_event) {
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wblock->handler = wmi_notify_debug;
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status = wmi_method_enable(wblock, 1);
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}
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list_add_tail(&wblock->list, &wmi_blocks.list);
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}
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