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@xxxxxxx>
CC: platform-driver-x86@xxxxxxxxxxxxxxx
CC: mjg59@xxxxxxxxxxxxx
CC: corentin.chary@xxxxxxxxx
---
drivers/platform/x86/wmi.c | 58 +++++++++++++++++++++++++++++++++++++------
1 files changed, 50 insertions(+), 8 deletions(-)
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index 39ec5b6..e4e4a48 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -81,6 +81,11 @@ static struct wmi_block wmi_blocks;
#define ACPI_WMI_STRING 0x4 /* GUID takes & returns a string */
#define ACPI_WMI_EVENT 0x8 /* GUID is an event */
+static int debug_event;
+module_param(debug_event, bool, 0444);
+MODULE_PARM_DESC(debug_event,
+ "Log WMI Events [0/1]");
+
static int acpi_wmi_remove(struct acpi_device *device, int type);
static int acpi_wmi_add(struct acpi_device *device);
static void acpi_wmi_notify(struct acpi_device *device, u32 event);
@@ -477,6 +482,37 @@ const struct acpi_buffer *in)
}
EXPORT_SYMBOL_GPL(wmi_set_block);
+static void wmi_notify_debug(u32 value, void *context)
+{
+ struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *obj;
+
+ wmi_get_event_data(value, &response);
+
+ obj = (union acpi_object *)response.pointer;
+
+ if (!obj)
+ return;
+
+ printk(KERN_INFO PREFIX "DEBUG Event ");
+ switch(obj->type) {
+ case ACPI_TYPE_BUFFER:
+ printk("BUFFER_TYPE - length %d\n", obj->buffer.length);
+ break;
+ case ACPI_TYPE_STRING:
+ printk("STRING_TYPE - %s\n", obj->string.pointer);
+ break;
+ case ACPI_TYPE_INTEGER:
+ printk("INTEGER_TYPE - %llu\n", obj->integer.value);
+ break;
+ case ACPI_TYPE_PACKAGE:
+ printk("PACKAGE_TYPE - %d elements\n", obj->package.count);
+ break;
+ default:
+ printk("object type 0x%X\n", obj->type);
+ }
+}
+
/**
* wmi_install_notify_handler - Register handler for WMI events
* @handler: Function to handle notifications
@@ -496,7 +532,7 @@ wmi_notify_handler handler, void *data)
if (!find_guid(guid, &block))
return AE_NOT_EXIST;
- if (block->handler)
+ if (block->handler && block->handler != wmi_notify_debug)
return AE_ALREADY_ACQUIRED;
block->handler = handler;
@@ -516,7 +552,7 @@ EXPORT_SYMBOL_GPL(wmi_install_notify_handler);
acpi_status wmi_remove_notify_handler(const char *guid)
{
struct wmi_block *block;
- acpi_status status;
+ acpi_status status = AE_OK;
if (!guid)
return AE_BAD_PARAMETER;
@@ -524,14 +560,16 @@ acpi_status wmi_remove_notify_handler(const char *guid)
if (!find_guid(guid, &block))
return AE_NOT_EXIST;
- if (!block->handler)
+ if (!block->handler || block->handler == wmi_notify_debug)
return AE_NULL_ENTRY;
- status = wmi_method_enable(block, 0);
-
- block->handler = NULL;
- block->handler_data = NULL;
-
+ if (debug_event) {
+ block->handler = wmi_notify_debug;
+ } else {
+ status = wmi_method_enable(block, 0);
+ block->handler = NULL;
+ block->handler_data = NULL;
+ }
return status;
}
EXPORT_SYMBOL_GPL(wmi_remove_notify_handler);
@@ -782,6 +820,10 @@ static __init acpi_status parse_wdg(acpi_handle handle)
wblock->gblock = gblock[i];
wblock->handle = handle;
+ if (debug_event) {
+ wblock->handler = wmi_notify_debug;
+ status = wmi_method_enable(wblock, 1);
+ }
list_add_tail(&wblock->list, &wmi_blocks.list);
}
--
1.6.3
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