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X86 platform wmi: Introduce debug param to log all WMI events

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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>
This commit is contained in:
Thomas Renninger 2010-05-03 15:30:15 +02:00 committed by Matthew Garrett
parent 7ab52521f2
commit fc3155b2c6
1 changed files with 50 additions and 8 deletions
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58
drivers/platform/x86/wmi.c
View file

@ -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);
@ -780,6 +818,10 @@ 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);
}