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Diffstat (limited to 'drivers/platform/x86/wmi.c')
-rw-r--r--drivers/platform/x86/wmi.c686
1 files changed, 553 insertions, 133 deletions
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index ceeb8c188ef3..1a764e311e11 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -8,6 +8,10 @@
* Copyright (c) 2001-2007 Anton Altaparmakov
* Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>
*
+ * WMI bus infrastructure by Andrew Lutomirski and Darren Hart:
+ * Copyright (C) 2015 Andrew Lutomirski
+ * Copyright (C) 2017 VMware, Inc. All Rights Reserved.
+ *
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
@@ -37,6 +41,8 @@
#include <linux/acpi.h>
#include <linux/slab.h>
#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/wmi.h>
#include <linux/uuid.h>
ACPI_MODULE_NAME("wmi");
@@ -44,8 +50,6 @@ MODULE_AUTHOR("Carlos Corbacho");
MODULE_DESCRIPTION("ACPI-WMI Mapping Driver");
MODULE_LICENSE("GPL");
-#define ACPI_WMI_CLASS "wmi"
-
static LIST_HEAD(wmi_block_list);
struct guid_block {
@@ -62,12 +66,14 @@ struct guid_block {
};
struct wmi_block {
+ struct wmi_device dev;
struct list_head list;
struct guid_block gblock;
- acpi_handle handle;
+ struct acpi_device *acpi_device;
wmi_notify_handler handler;
void *handler_data;
- struct device dev;
+
+ bool read_takes_no_args;
};
@@ -90,9 +96,8 @@ module_param(debug_dump_wdg, bool, 0444);
MODULE_PARM_DESC(debug_dump_wdg,
"Dump available WMI interfaces [0/1]");
-static int acpi_wmi_remove(struct acpi_device *device);
-static int acpi_wmi_add(struct acpi_device *device);
-static void acpi_wmi_notify(struct acpi_device *device, u32 event);
+static int acpi_wmi_remove(struct platform_device *device);
+static int acpi_wmi_probe(struct platform_device *device);
static const struct acpi_device_id wmi_device_ids[] = {
{"PNP0C14", 0},
@@ -101,15 +106,13 @@ static const struct acpi_device_id wmi_device_ids[] = {
};
MODULE_DEVICE_TABLE(acpi, wmi_device_ids);
-static struct acpi_driver acpi_wmi_driver = {
- .name = "wmi",
- .class = ACPI_WMI_CLASS,
- .ids = wmi_device_ids,
- .ops = {
- .add = acpi_wmi_add,
- .remove = acpi_wmi_remove,
- .notify = acpi_wmi_notify,
+static struct platform_driver acpi_wmi_driver = {
+ .driver = {
+ .name = "acpi-wmi",
+ .acpi_match_table = wmi_device_ids,
},
+ .probe = acpi_wmi_probe,
+ .remove = acpi_wmi_remove,
};
/*
@@ -139,6 +142,30 @@ static bool find_guid(const char *guid_string, struct wmi_block **out)
return false;
}
+static int get_subobj_info(acpi_handle handle, const char *pathname,
+ struct acpi_device_info **info)
+{
+ struct acpi_device_info *dummy_info, **info_ptr;
+ acpi_handle subobj_handle;
+ acpi_status status;
+
+ status = acpi_get_handle(handle, (char *)pathname, &subobj_handle);
+ if (status == AE_NOT_FOUND)
+ return -ENOENT;
+ else if (ACPI_FAILURE(status))
+ return -EIO;
+
+ info_ptr = info ? info : &dummy_info;
+ status = acpi_get_object_info(subobj_handle, info_ptr);
+ if (ACPI_FAILURE(status))
+ return -EIO;
+
+ if (!info)
+ kfree(dummy_info);
+
+ return 0;
+}
+
static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable)
{
struct guid_block *block = NULL;
@@ -147,7 +174,7 @@ static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable)
acpi_handle handle;
block = &wblock->gblock;
- handle = wblock->handle;
+ handle = wblock->acpi_device->handle;
snprintf(method, 5, "WE%02X", block->notify_id);
status = acpi_execute_simple_method(handle, method, enable);
@@ -186,7 +213,7 @@ u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out)
return AE_ERROR;
block = &wblock->gblock;
- handle = wblock->handle;
+ handle = wblock->acpi_device->handle;
if (!(block->flags & ACPI_WMI_METHOD))
return AE_BAD_DATA;
@@ -221,19 +248,10 @@ u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out)
}
EXPORT_SYMBOL_GPL(wmi_evaluate_method);
-/**
- * wmi_query_block - Return contents of a WMI block
- * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
- * @instance: Instance index
- * &out: Empty buffer to return the contents of the data block to
- *
- * Return the contents of an ACPI-WMI data block to a buffer
- */
-acpi_status wmi_query_block(const char *guid_string, u8 instance,
-struct acpi_buffer *out)
+static acpi_status __query_block(struct wmi_block *wblock, u8 instance,
+ struct acpi_buffer *out)
{
struct guid_block *block = NULL;
- struct wmi_block *wblock = NULL;
acpi_handle handle;
acpi_status status, wc_status = AE_ERROR;
struct acpi_object_list input;
@@ -241,14 +259,11 @@ struct acpi_buffer *out)
char method[5];
char wc_method[5] = "WC";
- if (!guid_string || !out)
+ if (!out)
return AE_BAD_PARAMETER;
- if (!find_guid(guid_string, &wblock))
- return AE_ERROR;
-
block = &wblock->gblock;
- handle = wblock->handle;
+ handle = wblock->acpi_device->handle;
if (block->instance_count < instance)
return AE_BAD_PARAMETER;
@@ -262,6 +277,9 @@ struct acpi_buffer *out)
wq_params[0].type = ACPI_TYPE_INTEGER;
wq_params[0].integer.value = instance;
+ if (instance == 0 && wblock->read_takes_no_args)
+ input.count = 0;
+
/*
* If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to
* enable collection.
@@ -294,8 +312,59 @@ struct acpi_buffer *out)
return status;
}
+
+/**
+ * wmi_query_block - Return contents of a WMI block (deprecated)
+ * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
+ * @instance: Instance index
+ * &out: Empty buffer to return the contents of the data block to
+ *
+ * Return the contents of an ACPI-WMI data block to a buffer
+ */
+acpi_status wmi_query_block(const char *guid_string, u8 instance,
+ struct acpi_buffer *out)
+{
+ struct wmi_block *wblock;
+
+ if (!guid_string)
+ return AE_BAD_PARAMETER;
+
+ if (!find_guid(guid_string, &wblock))
+ return AE_ERROR;
+
+ return __query_block(wblock, instance, out);
+}
EXPORT_SYMBOL_GPL(wmi_query_block);
+union acpi_object *wmidev_block_query(struct wmi_device *wdev, u8 instance)
+{
+ struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
+ struct wmi_block *wblock = container_of(wdev, struct wmi_block, dev);
+
+ if (ACPI_FAILURE(__query_block(wblock, instance, &out)))
+ return NULL;
+
+ return (union acpi_object *)out.pointer;
+}
+EXPORT_SYMBOL_GPL(wmidev_block_query);
+
+struct wmi_device *wmidev_get_other_guid(struct wmi_device *wdev,
+ const char *guid_string)
+{
+ struct wmi_block *this_wb = container_of(wdev, struct wmi_block, dev);
+ struct wmi_block *other_wb;
+
+ if (!find_guid(guid_string, &other_wb))
+ return NULL;
+
+ if (other_wb->acpi_device != this_wb->acpi_device)
+ return NULL;
+
+ get_device(&other_wb->dev.dev);
+ return &other_wb->dev;
+}
+EXPORT_SYMBOL_GPL(wmidev_get_other_guid);
+
/**
* wmi_set_block - Write to a WMI block
* @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
@@ -305,7 +374,7 @@ EXPORT_SYMBOL_GPL(wmi_query_block);
* Write the contents of the input buffer to an ACPI-WMI data block
*/
acpi_status wmi_set_block(const char *guid_string, u8 instance,
-const struct acpi_buffer *in)
+ const struct acpi_buffer *in)
{
struct guid_block *block = NULL;
struct wmi_block *wblock = NULL;
@@ -321,7 +390,7 @@ const struct acpi_buffer *in)
return AE_ERROR;
block = &wblock->gblock;
- handle = wblock->handle;
+ handle = wblock->acpi_device->handle;
if (block->instance_count < instance)
return AE_BAD_PARAMETER;
@@ -352,9 +421,10 @@ EXPORT_SYMBOL_GPL(wmi_set_block);
static void wmi_dump_wdg(const struct guid_block *g)
{
pr_info("%pUL:\n", g->guid);
- pr_info("\tobject_id: %c%c\n", g->object_id[0], g->object_id[1]);
- pr_info("\tnotify_id: %02X\n", g->notify_id);
- pr_info("\treserved: %02X\n", g->reserved);
+ if (g->flags & ACPI_WMI_EVENT)
+ pr_info("\tnotify_id: 0x%02X\n", g->notify_id);
+ else
+ pr_info("\tobject_id: %2pE\n", g->object_id);
pr_info("\tinstance_count: %d\n", g->instance_count);
pr_info("\tflags: %#x", g->flags);
if (g->flags) {
@@ -525,8 +595,8 @@ acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out)
if ((gblock->flags & ACPI_WMI_EVENT) &&
(gblock->notify_id == event))
- return acpi_evaluate_object(wblock->handle, "_WED",
- &input, out);
+ return acpi_evaluate_object(wblock->acpi_device->handle,
+ "_WED", &input, out);
}
return AE_NOT_FOUND;
@@ -545,99 +615,320 @@ bool wmi_has_guid(const char *guid_string)
}
EXPORT_SYMBOL_GPL(wmi_has_guid);
+static struct wmi_block *dev_to_wblock(struct device *dev)
+{
+ return container_of(dev, struct wmi_block, dev.dev);
+}
+
+static struct wmi_device *dev_to_wdev(struct device *dev)
+{
+ return container_of(dev, struct wmi_device, dev);
+}
+
/*
* sysfs interface
*/
static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
- struct wmi_block *wblock;
-
- wblock = dev_get_drvdata(dev);
- if (!wblock) {
- strcat(buf, "\n");
- return strlen(buf);
- }
+ struct wmi_block *wblock = dev_to_wblock(dev);
return sprintf(buf, "wmi:%pUL\n", wblock->gblock.guid);
}
static DEVICE_ATTR_RO(modalias);
+static ssize_t guid_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct wmi_block *wblock = dev_to_wblock(dev);
+
+ return sprintf(buf, "%pUL\n", wblock->gblock.guid);
+}
+static DEVICE_ATTR_RO(guid);
+
+static ssize_t instance_count_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct wmi_block *wblock = dev_to_wblock(dev);
+
+ return sprintf(buf, "%d\n", (int)wblock->gblock.instance_count);
+}
+static DEVICE_ATTR_RO(instance_count);
+
+static ssize_t expensive_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct wmi_block *wblock = dev_to_wblock(dev);
+
+ return sprintf(buf, "%d\n",
+ (wblock->gblock.flags & ACPI_WMI_EXPENSIVE) != 0);
+}
+static DEVICE_ATTR_RO(expensive);
+
static struct attribute *wmi_attrs[] = {
&dev_attr_modalias.attr,
+ &dev_attr_guid.attr,
+ &dev_attr_instance_count.attr,
+ &dev_attr_expensive.attr,
NULL,
};
ATTRIBUTE_GROUPS(wmi);
-static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
+static ssize_t notify_id_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
{
- char guid_string[37];
+ struct wmi_block *wblock = dev_to_wblock(dev);
- struct wmi_block *wblock;
+ return sprintf(buf, "%02X\n", (unsigned int)wblock->gblock.notify_id);
+}
+static DEVICE_ATTR_RO(notify_id);
+
+static struct attribute *wmi_event_attrs[] = {
+ &dev_attr_notify_id.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(wmi_event);
+
+static ssize_t object_id_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct wmi_block *wblock = dev_to_wblock(dev);
+
+ return sprintf(buf, "%c%c\n", wblock->gblock.object_id[0],
+ wblock->gblock.object_id[1]);
+}
+static DEVICE_ATTR_RO(object_id);
+
+static ssize_t setable_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct wmi_device *wdev = dev_to_wdev(dev);
+
+ return sprintf(buf, "%d\n", (int)wdev->setable);
+}
+static DEVICE_ATTR_RO(setable);
- if (add_uevent_var(env, "MODALIAS="))
+static struct attribute *wmi_data_attrs[] = {
+ &dev_attr_object_id.attr,
+ &dev_attr_setable.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(wmi_data);
+
+static struct attribute *wmi_method_attrs[] = {
+ &dev_attr_object_id.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(wmi_method);
+
+static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ struct wmi_block *wblock = dev_to_wblock(dev);
+
+ if (add_uevent_var(env, "MODALIAS=wmi:%pUL", wblock->gblock.guid))
return -ENOMEM;
- wblock = dev_get_drvdata(dev);
- if (!wblock)
+ if (add_uevent_var(env, "WMI_GUID=%pUL", wblock->gblock.guid))
return -ENOMEM;
- sprintf(guid_string, "%pUL", wblock->gblock.guid);
+ return 0;
+}
- strcpy(&env->buf[env->buflen - 1], "wmi:");
- memcpy(&env->buf[env->buflen - 1 + 4], guid_string, 36);
- env->buflen += 40;
+static void wmi_dev_release(struct device *dev)
+{
+ struct wmi_block *wblock = dev_to_wblock(dev);
+
+ kfree(wblock);
+}
+
+static int wmi_dev_match(struct device *dev, struct device_driver *driver)
+{
+ struct wmi_driver *wmi_driver =
+ container_of(driver, struct wmi_driver, driver);
+ struct wmi_block *wblock = dev_to_wblock(dev);
+ const struct wmi_device_id *id = wmi_driver->id_table;
+
+ while (id->guid_string) {
+ uuid_le driver_guid;
+
+ if (WARN_ON(uuid_le_to_bin(id->guid_string, &driver_guid)))
+ continue;
+ if (!memcmp(&driver_guid, wblock->gblock.guid, 16))
+ return 1;
+
+ id++;
+ }
return 0;
}
-static void wmi_dev_free(struct device *dev)
+static int wmi_dev_probe(struct device *dev)
{
- struct wmi_block *wmi_block = container_of(dev, struct wmi_block, dev);
+ struct wmi_block *wblock = dev_to_wblock(dev);
+ struct wmi_driver *wdriver =
+ container_of(dev->driver, struct wmi_driver, driver);
+ int ret = 0;
+
+ if (ACPI_FAILURE(wmi_method_enable(wblock, 1)))
+ dev_warn(dev, "failed to enable device -- probing anyway\n");
+
+ if (wdriver->probe) {
+ ret = wdriver->probe(dev_to_wdev(dev));
+ if (ret != 0 && ACPI_FAILURE(wmi_method_enable(wblock, 0)))
+ dev_warn(dev, "failed to disable device\n");
+ }
+
+ return ret;
+}
+
+static int wmi_dev_remove(struct device *dev)
+{
+ struct wmi_block *wblock = dev_to_wblock(dev);
+ struct wmi_driver *wdriver =
+ container_of(dev->driver, struct wmi_driver, driver);
+ int ret = 0;
+
+ if (wdriver->remove)
+ ret = wdriver->remove(dev_to_wdev(dev));
+
+ if (ACPI_FAILURE(wmi_method_enable(wblock, 0)))
+ dev_warn(dev, "failed to disable device\n");
- kfree(wmi_block);
+ return ret;
}
-static struct class wmi_class = {
+static struct class wmi_bus_class = {
+ .name = "wmi_bus",
+};
+
+static struct bus_type wmi_bus_type = {
.name = "wmi",
- .dev_release = wmi_dev_free,
- .dev_uevent = wmi_dev_uevent,
.dev_groups = wmi_groups,
+ .match = wmi_dev_match,
+ .uevent = wmi_dev_uevent,
+ .probe = wmi_dev_probe,
+ .remove = wmi_dev_remove,
+};
+
+static struct device_type wmi_type_event = {
+ .name = "event",
+ .groups = wmi_event_groups,
+ .release = wmi_dev_release,
};
-static int wmi_create_device(const struct guid_block *gblock,
- struct wmi_block *wblock, acpi_handle handle)
+static struct device_type wmi_type_method = {
+ .name = "method",
+ .groups = wmi_method_groups,
+ .release = wmi_dev_release,
+};
+
+static struct device_type wmi_type_data = {
+ .name = "data",
+ .groups = wmi_data_groups,
+ .release = wmi_dev_release,
+};
+
+static int wmi_create_device(struct device *wmi_bus_dev,
+ const struct guid_block *gblock,
+ struct wmi_block *wblock,
+ struct acpi_device *device)
{
- wblock->dev.class = &wmi_class;
+ struct acpi_device_info *info;
+ char method[5];
+ int result;
- dev_set_name(&wblock->dev, "%pUL", gblock->guid);
+ if (gblock->flags & ACPI_WMI_EVENT) {
+ wblock->dev.dev.type = &wmi_type_event;
+ goto out_init;
+ }
- dev_set_drvdata(&wblock->dev, wblock);
+ if (gblock->flags & ACPI_WMI_METHOD) {
+ wblock->dev.dev.type = &wmi_type_method;
+ goto out_init;
+ }
- return device_register(&wblock->dev);
+ /*
+ * Data Block Query Control Method (WQxx by convention) is
+ * required per the WMI documentation. If it is not present,
+ * we ignore this data block.
+ */
+ strcpy(method, "WQ");
+ strncat(method, wblock->gblock.object_id, 2);
+ result = get_subobj_info(device->handle, method, &info);
+
+ if (result) {
+ dev_warn(wmi_bus_dev,
+ "%s data block query control method not found",
+ method);
+ return result;
+ }
+
+ wblock->dev.dev.type = &wmi_type_data;
+
+ /*
+ * The Microsoft documentation specifically states:
+ *
+ * Data blocks registered with only a single instance
+ * can ignore the parameter.
+ *
+ * ACPICA will get mad at us if we call the method with the wrong number
+ * of arguments, so check what our method expects. (On some Dell
+ * laptops, WQxx may not be a method at all.)
+ */
+ if (info->type != ACPI_TYPE_METHOD || info->param_count == 0)
+ wblock->read_takes_no_args = true;
+
+ kfree(info);
+
+ strcpy(method, "WS");
+ strncat(method, wblock->gblock.object_id, 2);
+ result = get_subobj_info(device->handle, method, NULL);
+
+ if (result == 0)
+ wblock->dev.setable = true;
+
+ out_init:
+ wblock->dev.dev.bus = &wmi_bus_type;
+ wblock->dev.dev.parent = wmi_bus_dev;
+
+ dev_set_name(&wblock->dev.dev, "%pUL", gblock->guid);
+
+ device_initialize(&wblock->dev.dev);
+
+ return 0;
}
-static void wmi_free_devices(void)
+static void wmi_free_devices(struct acpi_device *device)
{
struct wmi_block *wblock, *next;
/* Delete devices for all the GUIDs */
list_for_each_entry_safe(wblock, next, &wmi_block_list, list) {
- list_del(&wblock->list);
- if (wblock->dev.class)
- device_unregister(&wblock->dev);
- else
- kfree(wblock);
+ if (wblock->acpi_device == device) {
+ list_del(&wblock->list);
+ device_unregister(&wblock->dev.dev);
+ }
}
}
-static bool guid_already_parsed(const char *guid_string)
+static bool guid_already_parsed(struct acpi_device *device,
+ const u8 *guid)
{
struct wmi_block *wblock;
- list_for_each_entry(wblock, &wmi_block_list, list)
- if (memcmp(wblock->gblock.guid, guid_string, 16) == 0)
+ list_for_each_entry(wblock, &wmi_block_list, list) {
+ if (memcmp(wblock->gblock.guid, guid, 16) == 0) {
+ /*
+ * Because we historically didn't track the relationship
+ * between GUIDs and ACPI nodes, we don't know whether
+ * we need to suppress GUIDs that are unique on a
+ * given node but duplicated across nodes.
+ */
+ dev_warn(&device->dev, "duplicate WMI GUID %pUL (first instance was on %s)\n",
+ guid, dev_name(&wblock->acpi_device->dev));
return true;
+ }
+ }
return false;
}
@@ -645,17 +936,17 @@ static bool guid_already_parsed(const char *guid_string)
/*
* Parse the _WDG method for the GUID data blocks
*/
-static int parse_wdg(acpi_handle handle)
+static int parse_wdg(struct device *wmi_bus_dev, struct acpi_device *device)
{
struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
- union acpi_object *obj;
const struct guid_block *gblock;
- struct wmi_block *wblock;
+ struct wmi_block *wblock, *next;
+ union acpi_object *obj;
acpi_status status;
- int retval;
+ int retval = 0;
u32 i, total;
- status = acpi_evaluate_object(handle, "_WDG", NULL, &out);
+ status = acpi_evaluate_object(device->handle, "_WDG", NULL, &out);
if (ACPI_FAILURE(status))
return -ENXIO;
@@ -675,25 +966,28 @@ static int parse_wdg(acpi_handle handle)
if (debug_dump_wdg)
wmi_dump_wdg(&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(device, gblock[i].guid))
+ continue;
+
wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL);
- if (!wblock)
- return -ENOMEM;
+ if (!wblock) {
+ retval = -ENOMEM;
+ break;
+ }
- wblock->handle = handle;
+ wblock->acpi_device = device;
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();
- goto out_free_pointer;
- }
+ retval = wmi_create_device(wmi_bus_dev, &gblock[i], wblock, device);
+ if (retval) {
+ kfree(wblock);
+ continue;
}
list_add_tail(&wblock->list, &wmi_block_list);
@@ -704,11 +998,27 @@ static int parse_wdg(acpi_handle handle)
}
}
- retval = 0;
+ /*
+ * Now that all of the devices are created, add them to the
+ * device tree and probe subdrivers.
+ */
+ list_for_each_entry_safe(wblock, next, &wmi_block_list, list) {
+ if (wblock->acpi_device != device)
+ continue;
+
+ retval = device_add(&wblock->dev.dev);
+ if (retval) {
+ dev_err(wmi_bus_dev, "failed to register %pULL\n",
+ wblock->gblock.guid);
+ if (debug_event)
+ wmi_method_enable(wblock, 0);
+ list_del(&wblock->list);
+ put_device(&wblock->dev.dev);
+ }
+ }
out_free_pointer:
kfree(out.pointer);
-
return retval;
}
@@ -756,67 +1066,168 @@ acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address,
}
}
-static void acpi_wmi_notify(struct acpi_device *device, u32 event)
+static void acpi_wmi_notify_handler(acpi_handle handle, u32 event,
+ void *context)
{
struct guid_block *block;
struct wmi_block *wblock;
struct list_head *p;
+ bool found_it = false;
list_for_each(p, &wmi_block_list) {
wblock = list_entry(p, struct wmi_block, list);
block = &wblock->gblock;
- if ((block->flags & ACPI_WMI_EVENT) &&
- (block->notify_id == event)) {
- if (wblock->handler)
- wblock->handler(event, wblock->handler_data);
- if (debug_event) {
- pr_info("DEBUG Event GUID: %pUL\n",
- wblock->gblock.guid);
- }
-
- acpi_bus_generate_netlink_event(
- device->pnp.device_class, dev_name(&device->dev),
- event, 0);
+ if (wblock->acpi_device->handle == handle &&
+ (block->flags & ACPI_WMI_EVENT) &&
+ (block->notify_id == event))
+ {
+ found_it = true;
break;
}
}
+
+ if (!found_it)
+ return;
+
+ /* If a driver is bound, then notify the driver. */
+ if (wblock->dev.dev.driver) {
+ struct wmi_driver *driver;
+ struct acpi_object_list input;
+ union acpi_object params[1];
+ struct acpi_buffer evdata = { ACPI_ALLOCATE_BUFFER, NULL };
+ acpi_status status;
+
+ driver = container_of(wblock->dev.dev.driver,
+ struct wmi_driver, driver);
+
+ input.count = 1;
+ input.pointer = params;
+ params[0].type = ACPI_TYPE_INTEGER;
+ params[0].integer.value = event;
+
+ status = acpi_evaluate_object(wblock->acpi_device->handle,
+ "_WED", &input, &evdata);
+ if (ACPI_FAILURE(status)) {
+ dev_warn(&wblock->dev.dev,
+ "failed to get event data\n");
+ return;
+ }
+
+ if (driver->notify)
+ driver->notify(&wblock->dev,
+ (union acpi_object *)evdata.pointer);
+
+ kfree(evdata.pointer);
+ } else if (wblock->handler) {
+ /* Legacy handler */
+ wblock->handler(event, wblock->handler_data);
+ }
+
+ if (debug_event) {
+ pr_info("DEBUG Event GUID: %pUL\n",
+ wblock->gblock.guid);
+ }
+
+ acpi_bus_generate_netlink_event(
+ wblock->acpi_device->pnp.device_class,
+ dev_name(&wblock->dev.dev),
+ event, 0);
+
}
-static int acpi_wmi_remove(struct acpi_device *device)
+static int acpi_wmi_remove(struct platform_device *device)
{
- acpi_remove_address_space_handler(device->handle,
+ struct acpi_device *acpi_device = ACPI_COMPANION(&device->dev);
+
+ acpi_remove_notify_handler(acpi_device->handle, ACPI_DEVICE_NOTIFY,
+ acpi_wmi_notify_handler);
+ acpi_remove_address_space_handler(acpi_device->handle,
ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler);
- wmi_free_devices();
+ wmi_free_devices(acpi_device);
+ device_unregister((struct device *)dev_get_drvdata(&device->dev));
return 0;
}
-static int acpi_wmi_add(struct acpi_device *device)
+static int acpi_wmi_probe(struct platform_device *device)
{
+ struct acpi_device *acpi_device;
+ struct device *wmi_bus_dev;
acpi_status status;
int error;
- status = acpi_install_address_space_handler(device->handle,
+ acpi_device = ACPI_COMPANION(&device->dev);
+ if (!acpi_device) {
+ dev_err(&device->dev, "ACPI companion is missing\n");
+ return -ENODEV;
+ }
+
+ status = acpi_install_address_space_handler(acpi_device->handle,
ACPI_ADR_SPACE_EC,
&acpi_wmi_ec_space_handler,
NULL, NULL);
if (ACPI_FAILURE(status)) {
- pr_err("Error installing EC region handler\n");
+ dev_err(&device->dev, "Error installing EC region handler\n");
return -ENODEV;
}
- error = parse_wdg(device->handle);
+ status = acpi_install_notify_handler(acpi_device->handle,
+ ACPI_DEVICE_NOTIFY,
+ acpi_wmi_notify_handler,
+ NULL);
+ if (ACPI_FAILURE(status)) {
+ dev_err(&device->dev, "Error installing notify handler\n");
+ error = -ENODEV;
+ goto err_remove_ec_handler;
+ }
+
+ wmi_bus_dev = device_create(&wmi_bus_class, &device->dev, MKDEV(0, 0),
+ NULL, "wmi_bus-%s", dev_name(&device->dev));
+ if (IS_ERR(wmi_bus_dev)) {
+ error = PTR_ERR(wmi_bus_dev);
+ goto err_remove_notify_handler;
+ }
+ dev_set_drvdata(&device->dev, wmi_bus_dev);
+
+ error = parse_wdg(wmi_bus_dev, acpi_device);
if (error) {
- acpi_remove_address_space_handler(device->handle,
- ACPI_ADR_SPACE_EC,
- &acpi_wmi_ec_space_handler);
pr_err("Failed to parse WDG method\n");
- return error;
+ goto err_remove_busdev;
}
return 0;
+
+err_remove_busdev:
+ device_unregister(wmi_bus_dev);
+
+err_remove_notify_handler:
+ acpi_remove_notify_handler(acpi_device->handle, ACPI_DEVICE_NOTIFY,
+ acpi_wmi_notify_handler);
+
+err_remove_ec_handler:
+ acpi_remove_address_space_handler(acpi_device->handle,
+ ACPI_ADR_SPACE_EC,
+ &acpi_wmi_ec_space_handler);
+
+ return error;
+}
+
+int __must_check __wmi_driver_register(struct wmi_driver *driver,
+ struct module *owner)
+{
+ driver->driver.owner = owner;
+ driver->driver.bus = &wmi_bus_type;
+
+ return driver_register(&driver->driver);
}
+EXPORT_SYMBOL(__wmi_driver_register);
+
+void wmi_driver_unregister(struct wmi_driver *driver)
+{
+ driver_unregister(&driver->driver);
+}
+EXPORT_SYMBOL(wmi_driver_unregister);
static int __init acpi_wmi_init(void)
{
@@ -825,27 +1236,36 @@ static int __init acpi_wmi_init(void)
if (acpi_disabled)
return -ENODEV;
- error = class_register(&wmi_class);
+ error = class_register(&wmi_bus_class);
if (error)
return error;
- error = acpi_bus_register_driver(&acpi_wmi_driver);
+ error = bus_register(&wmi_bus_type);
+ if (error)
+ goto err_unreg_class;
+
+ error = platform_driver_register(&acpi_wmi_driver);
if (error) {
pr_err("Error loading mapper\n");
- class_unregister(&wmi_class);
- return error;
+ goto err_unreg_bus;
}
- pr_info("Mapper loaded\n");
return 0;
+
+err_unreg_class:
+ class_unregister(&wmi_bus_class);
+
+err_unreg_bus:
+ bus_unregister(&wmi_bus_type);
+
+ return error;
}
static void __exit acpi_wmi_exit(void)
{
- acpi_bus_unregister_driver(&acpi_wmi_driver);
- class_unregister(&wmi_class);
-
- pr_info("Mapper unloaded\n");
+ platform_driver_unregister(&acpi_wmi_driver);
+ class_unregister(&wmi_bus_class);
+ bus_unregister(&wmi_bus_type);
}
subsys_initcall(acpi_wmi_init);