WMI

712 lines not on this page · raw message

index 4497964..aeffe08 100644
@@ -176,6 +176,26 @@ extern int ec_transaction(u8 command,
 
 #endif /*CONFIG_ACPI_EC*/
 
+#if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)
+
+typedef void (*wmi_notify_handler) (u32 value, void *context);
+
+extern acpi_status wmi_evaluate_method(const char *guid, u8 instance,
+					u32 method_id,
+					const struct acpi_buffer *in,
+					struct acpi_buffer *out);
+extern acpi_status wmi_query_block(const char *guid, u8 instance,
+					struct acpi_buffer *out);
+extern acpi_status wmi_set_block(const char *guid, u8 instance,
+					const struct acpi_buffer *in);
+extern acpi_status wmi_install_notify_handler(const char *guid,
+					wmi_notify_handler handler, void *data);
+extern acpi_status wmi_remove_notify_handler(const char *guid);
+extern acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out);
+extern bool wmi_has_guid(const char *guid);
+
+#endif	/* CONFIG_ACPI_WMI */
+
 extern int acpi_blacklisted(void);
 extern void acpi_bios_year(char *s);
 

965 lines not on this page · raw message

290 lines not on this page · raw message

index 0e443af..52015ba 100644
@@ -30,6 +30,8 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/types.h>
+#include <linux/device.h>
+#include <linux/mutex.h>
 #include <linux/list.h>
 #include <linux/acpi.h>
 #include <acpi/acpi_bus.h>

@@ -66,6 +68,11 @@ struct wmi_block {
 	acpi_handle handle;
 	wmi_notify_handler handler;
 	void *handler_data;
+	struct device dev;
+	u8 instance;
+	u32 method_id;
+	void *pointer;
+	acpi_size length;
 };
 
 static struct wmi_block wmi_blocks;

@@ -194,6 +201,33 @@ static bool wmi_parse_guid(const u8 *src, u8 *dest)
 	return true;
 }
 
+/*
+ * Convert a raw GUID to the ACII string representation
+ */
+static int wmi_gtoa(const char *in, char *out)
+{
+	int i;
+
+	for (i = 3; i >= 0; i--)
+		out += sprintf(out, "%02X", in[i] & 0xFF);
+
+	out += sprintf(out, "-");
+	out += sprintf(out, "%02X", in[5] & 0xFF);
+	out += sprintf(out, "%02X", in[4] & 0xFF);
+	out += sprintf(out, "-");
+	out += sprintf(out, "%02X", in[7] & 0xFF);
+	out += sprintf(out, "%02X", in[6] & 0xFF);
+	out += sprintf(out, "-");
+	out += sprintf(out, "%02X", in[8] & 0xFF);
+	out += sprintf(out, "%02X", in[9] & 0xFF);
+	out += sprintf(out, "-");
+
+	for (i = 10; i <= 15; i++)
+		out += sprintf(out, "%02X", in[i] & 0xFF);
+
+	return 0;
+}
+
 static bool find_guid(const char *guid_string, struct wmi_block **out)
 {
 	char tmp[16], guid_input[16];

@@ -517,6 +551,421 @@ bool wmi_has_guid(const char *guid_string)
 EXPORT_SYMBOL_GPL(wmi_has_guid);
 
 /*
+ * sysfs interface
+ */
+static ssize_t wmi_data_read(struct kobject *kobj, struct bin_attribute
+			*bin_attr, char *buf, loff_t offset, size_t count) {
+	u8 instance;
+	const char *guid;
+	struct acpi_buffer in;
+	struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
+	acpi_status status;
+	union acpi_object *obj;
+	struct wmi_block *block;
+	struct device *dev;
+
+	dev = container_of(kobj, struct device, kobj);
+	if (!dev)
+		return -ENODEV;
+
+	block = container_of(dev, struct wmi_block, dev);
+	if (!block)
+		return -EINVAL;
+
+	guid = block->gblock.guid;
+	if (!guid)
+		return -EINVAL;
+
+	instance = block->instance;
+
+	if (block->gblock.flags & ACPI_WMI_METHOD) {
+		mutex_lock(&wmi_data_lock);
+		if (block->pointer) {
+			in.pointer = block->pointer;
+			in.length = block->length;
+			status = wmi_evaluate_method(guid, instance,
+				block->method_id, &in, &out);
+		} else {
+			status = wmi_evaluate_method(guid, instance,
+				block->method_id, NULL, &out);
+		}
+		mutex_unlock(&wmi_data_lock);
+	} else {
+		status = wmi_query_block(guid, instance, &out);
+	}
+
+	obj = (union acpi_object *) out.pointer;
+
+	switch (obj->type) {
+	case (ACPI_TYPE_STRING):
+	case (ACPI_TYPE_BUFFER):
+		buf = obj->buffer.pointer;
+		break;
+	default:
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static ssize_t wmi_data_write(struct kobject *kobj, struct bin_attribute
+			*bin_attr, char *buf, loff_t offset, size_t count){
+	struct wmi_block *block;
+	struct acpi_buffer in;
+	acpi_status status;
+	struct device *dev;
+	char guid_string[37];
+
+	dev = container_of(kobj, struct device, kobj);
+	if (!dev)
+		return -ENODEV;
+
+	block = container_of(dev, struct wmi_block, dev);
+	if (!block)
+		return -EINVAL;
+
+	if (count == 0)
+		return count;
+
+	if (block->gblock.flags & ACPI_WMI_METHOD) {
+		block->pointer = kzalloc(count, GFP_KERNEL);
+		if (!block->pointer)
+			return count;
+
+		memcpy(block->pointer, buf, count);
+		block->length = count;
+	} else {
+		in.pointer = buf;
+		in.length = count;
+		wmi_gtoa(block->gblock.guid, guid_string);
+		status = wmi_set_block(guid_string, block->instance, &in);
+	}
+
+	return count;
+}
+
+static struct bin_attribute wmi_attr_data = {
+	.attr = {
+		.name = "data",
+		.mode = 0600
+	},
+	.size = 0,
+	.read = wmi_data_read,
+	.write = wmi_data_write,
+};
+
+static ssize_t wmi_event_data_read(struct kobject *kobj, struct bin_attribute
+			*bin_attr, char *buf, loff_t offset, size_t count) {
+	struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
+	union acpi_object *obj;
+	struct wmi_block *block;
+	struct device *dev;
+
+	dev = container_of(kobj, struct device, kobj);
+	if (!dev)
+		return -ENODEV;
+
+	block = container_of(dev, struct wmi_block, dev);
+	if (!block)
+		return -EINVAL;
+
+	wmi_get_event_data(block->gblock.notify_id, &out);
+
+	obj = (union acpi_object *) out.pointer;
+	buf = obj->buffer.pointer;
+
+	return 0;
+}
+
+static struct bin_attribute wmi_attr_event_data = {
+	.attr = {
+		.name = "data",
+		.mode = 0400
+	},
+	.size = 0,
+	.read = wmi_event_data_read,
+};
+
+static ssize_t show_type(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	struct guid_block *block;
+	struct wmi_block *wblock;
+
+	wblock = container_of(dev, struct wmi_block, dev);
+	if (!wblock)
+		return sprintf(buf, "Error\n");
+
+	block = &wblock->gblock;
+
+	if (block->flags & ACPI_WMI_METHOD) {
+		return sprintf(buf, "method\n");
+	} else if (block->flags & ACPI_WMI_EVENT) {
+		return sprintf(buf, "event\n");
+	} else {
+		return sprintf(buf, "data\n");
+	}
+}
+static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
+
+static ssize_t show_instance_count(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	struct wmi_block *block;
+
+	block = container_of(dev, struct wmi_block, dev);
+	if (!block)
+		return sprintf(buf, "Error\n");
+
+	return sprintf(buf, "%d\n", block->gblock.instance_count);
+}
+static DEVICE_ATTR(instance_count, S_IRUGO, show_instance_count, NULL);
+
+static ssize_t show_instance(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	struct wmi_block *block;
+
+	block = container_of(dev, struct wmi_block, dev);
+	if (!block)
+		return sprintf(buf, "Error\n");
+
+	return sprintf(buf, "%d\n", block->instance);
+}
+
+static ssize_t set_instance(struct device *dev,
+	struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct wmi_block *block;
+	u8 instance;
+
+	instance = simple_strtoul(buf, NULL, 10);
+
+	block = container_of(dev, struct wmi_block, dev);
+	if (!block)
+		return -EINVAL;
+
+	if (instance <= block->gblock.instance_count) {
+		block->instance = instance;
+	} else {
+		return -EINVAL;
+	}
+
+	return count;
+}
+static DEVICE_ATTR(instance, S_IWUGO | S_IRUGO, show_instance, set_instance);
+
+static ssize_t show_method_id(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	struct wmi_block *block;
+
+	block = container_of(dev, struct wmi_block, dev);
+	if (!block)
+		return sprintf(buf, "Error\n");
+
+	return sprintf(buf, "%d\n", block->method_id);
+}
+
+static ssize_t set_method_id(struct device *dev,
+	struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct wmi_block *block;
+	u8 method_id;
+
+	method_id = simple_strtoul(buf, NULL, 10);
+
+	mutex_lock(&wmi_data_lock);
+
+	block = container_of(dev, struct wmi_block, dev);
+	if (!block) {
+		mutex_unlock(&wmi_data_lock);
+		return -EINVAL;
+	}
+
+	block->method_id = method_id;
+	mutex_unlock(&wmi_data_lock);
+
+	return count;
+}
+static DEVICE_ATTR(method_id, S_IWUGO | S_IRUGO, show_method_id,
+	set_method_id);
+
+static ssize_t show_event_notification(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	struct wmi_block *block;
+	struct guid_block *gblock;
+
+	block = container_of(dev, struct wmi_block, dev);
+	gblock = &block->gblock;
+
+	return sprintf(buf, "%d\n", gblock->notify_id & 0xFF);
+}
+static DEVICE_ATTR(notification, S_IRUGO, show_event_notification, NULL);
+
+static ssize_t show_string(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	struct wmi_block *block;
+	struct guid_block *gblock;
+
+	block = container_of(dev, struct wmi_block, dev);
+	gblock = &block->gblock;
+
+	return sprintf(buf, "%d\n", (gblock->flags & ACPI_WMI_STRING) >> 2);
+}
+static DEVICE_ATTR(string, S_IRUGO, show_string, NULL);
+
+static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+	char guid_string[37];
+
+	struct wmi_block *wblock;
+
+	if (add_uevent_var(env, "MODALIAS="))
+		return -ENOMEM;
+
+	wblock = container_of(dev, struct wmi_block, dev);
+	if (!wblock)
+		return -ENOMEM;
+
+	wmi_gtoa(wblock->gblock.guid, guid_string);
+
+	strcpy(&env->buf[env->buflen - 1], "wmi:");
+	memcpy(&env->buf[env->buflen - 1 + 4], guid_string, 36);
+	env->buflen += 40;
+
+	return 0;
+}
+
+static struct class wmi_class = {
+	.name = "wmi",
+	.dev_release = (void(*)(struct device *)) kfree,
+	.dev_uevent = wmi_dev_uevent,
+};
+
+static int wmi_create_devs(void)
+{
+	int result;
+	char guid_string[37];
+	struct guid_block *gblock;
+	struct wmi_block *wblock;
+	struct list_head *p;
+	struct device *guid_dev;
+
+	/* Create devices for all the GUIDs */
+	list_for_each(p, &wmi_blocks.list) {
+		wblock = list_entry(p, struct wmi_block, list);
+
+		guid_dev = &wblock->dev;
+		guid_dev->class = &wmi_class;
+
+		gblock = &wblock->gblock;
+
+		wmi_gtoa(gblock->guid, guid_string);
+		memcpy(guid_dev->bus_id, guid_string, 36);
+
+		result = device_register(guid_dev);
+		if (result)
+			return result;
+
+		result = device_create_file(guid_dev, &dev_attr_type);
+		if (result)
+			return result;
+
+		result = device_create_file(guid_dev, &dev_attr_string);
+		if (result)
+			return result;
+
+		if (gblock->flags & ACPI_WMI_EVENT) {
+			result = device_create_file(guid_dev,
+				&dev_attr_notification);
+			if (result)
+				return result;
+
+			result = device_create_bin_file(guid_dev,
+				&wmi_attr_event_data);
+			if (result)
+				return result;
+			break;
+		}
+
+		result = device_create_file(guid_dev, &dev_attr_instance_count);
+		if (result)
+			return result;
+
+		result = device_create_file(guid_dev, &dev_attr_instance);
+		if (result)
+			return result;
+
+		result = device_create_bin_file(guid_dev, &wmi_attr_data);
+		if (result)
+			return result;
+
+		if (gblock->flags & ACPI_WMI_METHOD) {
+			result = device_create_file(guid_dev,
+				&dev_attr_method_id);
+			if (result)
+				return result;
+		}
+	}
+
+	return 0;
+}
+
+static void wmi_remove_devs(void)
+{
+	struct guid_block *gblock;
+	struct wmi_block *wblock;
+	struct list_head *p;
+	struct device *guid_dev;
+
+	/* Delete devices for all the GUIDs */
+	list_for_each(p, &wmi_blocks.list) {
+		wblock = list_entry(p, struct wmi_block, list);
+
+		guid_dev = &wblock->dev;
+		gblock = &wblock->gblock;
+
+		device_remove_file(guid_dev, &dev_attr_type);
+		device_remove_file(guid_dev, &dev_attr_string);
+
+		if (gblock->flags & ACPI_WMI_EVENT) {
+			device_remove_file(guid_dev, &dev_attr_notification);
+			device_remove_bin_file(guid_dev, &wmi_attr_event_data);
+		} else {
+			device_remove_file(guid_dev, &dev_attr_instance_count);
+			device_remove_file(guid_dev, &dev_attr_instance);
+			device_remove_bin_file(guid_dev, &wmi_attr_data);
+
+			if (gblock->flags & ACPI_WMI_METHOD) {
+				device_remove_file(guid_dev,
+					&dev_attr_method_id);
+			}
+		}
+		device_unregister(guid_dev);
+	}
+}
+
+static int wmi_class_init(void)
+{
+	int ret;
+
+	ret = class_register(&wmi_class);
+	if (ret)
+		return ret;
+
+	return wmi_create_devs();
+}
+
+static void wmi_class_exit(void)
+{
+	wmi_remove_devs();
+	class_unregister(&wmi_class);
+}
+
+/*
  * Parse the _WDG method for the GUID data blocks
  */
 static __init acpi_status parse_wdg(acpi_handle handle)

@@ -673,6 +1122,7 @@ static int __init acpi_wmi_add(struct acpi_device *device)
 
 static int __init acpi_wmi_init(void)
 {
+	int ret;
 	acpi_status result;
 
 	if (acpi_disabled)

@@ -684,10 +1134,17 @@ static int __init acpi_wmi_init(void)
 
 	if (result < 0) {
 		printk(KERN_INFO PREFIX "Error loading mapper\n");
-	} else {
-		printk(KERN_INFO PREFIX "Mapper loaded\n");
+		return -ENODEV;
+	}
+
+	ret = wmi_class_init();
+	if (ret) {
+		acpi_bus_unregister_driver(&acpi_wmi_driver);
+		return ret;
 	}
 
+	printk(KERN_INFO PREFIX "Mapper loaded\n");
+
 	return result;
 }
 

@@ -696,6 +1153,8 @@ static void __exit acpi_wmi_exit(void)
 	struct list_head *p, *tmp;
 	struct wmi_block *wblock;
 
+	wmi_class_exit();
+
 	acpi_bus_unregister_driver(&acpi_wmi_driver);
 
 	list_for_each_safe(p, tmp, &wmi_blocks.list) {

index 52015ba..b922fd1 100644
@@ -864,7 +864,7 @@ static int wmi_create_devs(void)
 		gblock = &wblock->gblock;
 
 		wmi_gtoa(gblock->guid, guid_string);
-		memcpy(guid_dev->bus_id, guid_string, 36);
+		memcpy(guid_dev->bus_id, guid_string, 19);
 
 		result = device_register(guid_dev);
 		if (result)