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WMI: Cater for multiple events with same GUID

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WMI data blocks can contain WMI events with the same GUID but with
different notifiy_ids, for example volume up/down hotkeys.
This patch enables a single event handler to be registered and
unregistered against all events with same GUID but different
notify_ids.  Since an event handler is passed the notify_id of
an event it can can differentiate between the different events.

The patch also ensures we only register and unregister a device per
unique GUID.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Colin King 2010-11-19 15:40:02 +00:00 committed by Matthew Garrett
parent 3098064d3b
commit 58f6425eb9
1 changed files with 74 additions and 63 deletions
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137
drivers/platform/x86/wmi.c
View File

@ -549,21 +549,34 @@ acpi_status wmi_install_notify_handler(const char *guid,
wmi_notify_handler handler, void *data)
{
struct wmi_block *block;
acpi_status status;
acpi_status status = AE_NOT_EXIST;
char tmp[16], guid_input[16];
struct list_head *p;
if (!guid || !handler)
return AE_BAD_PARAMETER;
if (!find_guid(guid, &block))
return AE_NOT_EXIST;
wmi_parse_guid(guid, tmp);
wmi_swap_bytes(tmp, guid_input);
if (block->handler && block->handler != wmi_notify_debug)
return AE_ALREADY_ACQUIRED;
list_for_each(p, &wmi_block_list) {
acpi_status wmi_status;
block = list_entry(p, struct wmi_block, list);
block->handler = handler;
block->handler_data = data;
if (memcmp(block->gblock.guid, guid_input, 16) == 0) {
if (block->handler &&
block->handler != wmi_notify_debug)
return AE_ALREADY_ACQUIRED;
status = wmi_method_enable(block, 1);
block->handler = handler;
block->handler_data = data;
wmi_status = wmi_method_enable(block, 1);
if ((wmi_status != AE_OK) ||
((wmi_status == AE_OK) && (status == AE_NOT_EXIST)))
status = wmi_status;
}
}
return status;
}
@ -577,24 +590,40 @@ EXPORT_SYMBOL_GPL(wmi_install_notify_handler);
acpi_status wmi_remove_notify_handler(const char *guid)
{
struct wmi_block *block;
acpi_status status = AE_OK;
acpi_status status = AE_NOT_EXIST;
char tmp[16], guid_input[16];
struct list_head *p;
if (!guid)
return AE_BAD_PARAMETER;
if (!find_guid(guid, &block))
return AE_NOT_EXIST;
wmi_parse_guid(guid, tmp);
wmi_swap_bytes(tmp, guid_input);
if (!block->handler || block->handler == wmi_notify_debug)
return AE_NULL_ENTRY;
list_for_each(p, &wmi_block_list) {
acpi_status wmi_status;
block = list_entry(p, struct wmi_block, list);
if (debug_event) {
block->handler = wmi_notify_debug;
} else {
status = wmi_method_enable(block, 0);
block->handler = NULL;
block->handler_data = NULL;
if (memcmp(block->gblock.guid, guid_input, 16) == 0) {
if (!block->handler ||
block->handler == wmi_notify_debug)
return AE_NULL_ENTRY;
if (debug_event) {
block->handler = wmi_notify_debug;
status = AE_OK;
} else {
wmi_status = wmi_method_enable(block, 0);
block->handler = NULL;
block->handler_data = NULL;
if ((wmi_status != AE_OK) ||
((wmi_status == AE_OK) &&
(status == AE_NOT_EXIST)))
status = wmi_status;
}
}
}
return status;
}
EXPORT_SYMBOL_GPL(wmi_remove_notify_handler);
@ -705,22 +734,11 @@ static struct class wmi_class = {
.dev_attrs = wmi_dev_attrs,
};
static struct wmi_block *wmi_create_device(const struct guid_block *gblock,
acpi_handle handle)
static int wmi_create_device(const struct guid_block *gblock,
struct wmi_block *wblock, acpi_handle handle)
{
struct wmi_block *wblock;
int error;
char guid_string[37];
wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL);
if (!wblock) {
error = -ENOMEM;
goto err_out;
}
wblock->handle = handle;
wblock->gblock = *gblock;
wblock->dev.class = &wmi_class;
wmi_gtoa(gblock->guid, guid_string);
@ -728,17 +746,7 @@ static struct wmi_block *wmi_create_device(const struct guid_block *gblock,
dev_set_drvdata(&wblock->dev, wblock);
error = device_register(&wblock->dev);
if (error)
goto err_free;
list_add_tail(&wblock->list, &wmi_block_list);
return wblock;
err_free:
kfree(wblock);
err_out:
return ERR_PTR(error);
return device_register(&wblock->dev);
}
static void wmi_free_devices(void)
@ -747,7 +755,8 @@ static void wmi_free_devices(void)
/* Delete devices for all the GUIDs */
list_for_each_entry_safe(wblock, next, &wmi_block_list, list)
device_unregister(&wblock->dev);
if (wblock->dev.class)
device_unregister(&wblock->dev);
}
static bool guid_already_parsed(const char *guid_string)
@ -770,7 +779,6 @@ static acpi_status parse_wdg(acpi_handle handle)
union acpi_object *obj;
const struct guid_block *gblock;
struct wmi_block *wblock;
char guid_string[37];
acpi_status status;
int retval;
u32 i, total;
@ -792,29 +800,32 @@ static acpi_status parse_wdg(acpi_handle handle)
total = obj->buffer.length / sizeof(struct guid_block);
for (i = 0; i < total; i++) {
/*
Some WMI devices, like those for nVidia hooks, have a
duplicate GUID. It's not clear what we should do in this
case yet, so for now, we'll just ignore the duplicate.
Anyone who wants to add support for that device can come
up with a better workaround for the mess then.
*/
if (guid_already_parsed(gblock[i].guid) == true) {
wmi_gtoa(gblock[i].guid, guid_string);
pr_info("Skipping duplicate GUID %s\n", guid_string);
continue;
}
if (debug_dump_wdg)
wmi_dump_wdg(&gblock[i]);
wblock = wmi_create_device(&gblock[i], handle);
if (IS_ERR(wblock)) {
retval = PTR_ERR(wblock);
wmi_free_devices();
break;
wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL);
if (!wblock)
return AE_NO_MEMORY;
wblock->handle = handle;
wblock->gblock = gblock[i];
/*
Some WMI devices, like those for nVidia hooks, have a
duplicate GUID. It's not clear what we should do in this
case yet, so for now, we'll just ignore the duplicate
for device creation.
*/
if (!guid_already_parsed(gblock[i].guid)) {
retval = wmi_create_device(&gblock[i], wblock, handle);
if (retval) {
wmi_free_devices();
break;
}
}
list_add_tail(&wblock->list, &wmi_block_list);
if (debug_event) {
wblock->handler = wmi_notify_debug;
wmi_method_enable(wblock, 1);