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Subject[PATCH] WMI: Cater for multiple events with same GUID
Date
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>
---
drivers/platform/x86/wmi.c | 135 ++++++++++++++++++++++++--------------------
1 files changed, 73 insertions(+), 62 deletions(-)

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index 104b77c..67a21a2 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -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;
@@ -792,28 +800,31 @@ static acpi_status parse_wdg(acpi_handle handle)
total = obj->buffer.length / sizeof(struct guid_block);

for (i = 0; i < total; i++) {
+ if (debug_dump_wdg)
+ wmi_dump_wdg(&gblock[i]);
+
+ 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.
- Anyone who wants to add support for that device can come
- up with a better workaround for the mess then.
+ case yet, so for now, we'll just ignore the duplicate
+ for device creation.
*/
- 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 (!guid_already_parsed(gblock[i].guid)) {
+ retval = wmi_create_device(&gblock[i], wblock, handle);
+ if (retval) {
+ wmi_free_devices();
+ break;
+ }
}

- 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;
- }
+ list_add_tail(&wblock->list, &wmi_block_list);

if (debug_event) {
wblock->handler = wmi_notify_debug;
--
1.7.0.4


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