Commit 263b4c1a authored by Rafael J. Wysocki's avatar Rafael J. Wysocki

ACPI / property: Expose data-only subnodes via sysfs

Add infrastructure needed to expose data-only subnodes of ACPI
device objects introduced previously via sysfs.

Each data-only subnode is represented as a sysfs directory under
the directory corresponding to its parent object (a device or a
data-only subnode).  Each of them has a "path" attribute (containing
the full ACPI namespace path to the object the subnode data come from)
at this time.
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Mika Westerberg's avatarMika Westerberg <mika.westerberg@linux.intel.com>
parent 445b0eb0
......@@ -26,6 +26,106 @@
#include "internal.h"
static ssize_t acpi_object_path(acpi_handle handle, char *buf)
{
struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
int result;
result = acpi_get_name(handle, ACPI_FULL_PATHNAME, &path);
if (result)
return result;
result = sprintf(buf, "%s\n", (char*)path.pointer);
kfree(path.pointer);
return result;
}
struct acpi_data_node_attr {
struct attribute attr;
ssize_t (*show)(struct acpi_data_node *, char *);
ssize_t (*store)(struct acpi_data_node *, const char *, size_t count);
};
#define DATA_NODE_ATTR(_name) \
static struct acpi_data_node_attr data_node_##_name = \
__ATTR(_name, 0444, data_node_show_##_name, NULL)
static ssize_t data_node_show_path(struct acpi_data_node *dn, char *buf)
{
return acpi_object_path(dn->handle, buf);
}
DATA_NODE_ATTR(path);
static struct attribute *acpi_data_node_default_attrs[] = {
&data_node_path.attr,
NULL
};
#define to_data_node(k) container_of(k, struct acpi_data_node, kobj)
#define to_attr(a) container_of(a, struct acpi_data_node_attr, attr)
static ssize_t acpi_data_node_attr_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
struct acpi_data_node *dn = to_data_node(kobj);
struct acpi_data_node_attr *dn_attr = to_attr(attr);
return dn_attr->show ? dn_attr->show(dn, buf) : -ENXIO;
}
static const struct sysfs_ops acpi_data_node_sysfs_ops = {
.show = acpi_data_node_attr_show,
};
static void acpi_data_node_release(struct kobject *kobj)
{
struct acpi_data_node *dn = to_data_node(kobj);
complete(&dn->kobj_done);
}
static struct kobj_type acpi_data_node_ktype = {
.sysfs_ops = &acpi_data_node_sysfs_ops,
.default_attrs = acpi_data_node_default_attrs,
.release = acpi_data_node_release,
};
static void acpi_expose_nondev_subnodes(struct kobject *kobj,
struct acpi_device_data *data)
{
struct list_head *list = &data->subnodes;
struct acpi_data_node *dn;
if (list_empty(list))
return;
list_for_each_entry(dn, list, sibling) {
int ret;
init_completion(&dn->kobj_done);
ret = kobject_init_and_add(&dn->kobj, &acpi_data_node_ktype,
kobj, dn->name);
if (ret)
acpi_handle_err(dn->handle, "Failed to expose (%d)\n", ret);
else
acpi_expose_nondev_subnodes(&dn->kobj, &dn->data);
}
}
static void acpi_hide_nondev_subnodes(struct acpi_device_data *data)
{
struct list_head *list = &data->subnodes;
struct acpi_data_node *dn;
if (list_empty(list))
return;
list_for_each_entry_reverse(dn, list, sibling) {
acpi_hide_nondev_subnodes(&dn->data);
kobject_put(&dn->kobj);
}
}
/**
* create_pnp_modalias - Create hid/cid(s) string for modalias and uevent
* @acpi_dev: ACPI device object.
......@@ -323,20 +423,12 @@ static ssize_t acpi_device_adr_show(struct device *dev,
}
static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
static ssize_t
acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
static ssize_t acpi_device_path_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
int result;
result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
if (result)
goto end;
result = sprintf(buf, "%s\n", (char*)path.pointer);
kfree(path.pointer);
end:
return result;
return acpi_object_path(acpi_dev->handle, buf);
}
static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
......@@ -475,6 +567,8 @@ int acpi_device_setup_files(struct acpi_device *dev)
&dev_attr_real_power_state);
}
acpi_expose_nondev_subnodes(&dev->dev.kobj, &dev->data);
end:
return result;
}
......@@ -485,6 +579,8 @@ int acpi_device_setup_files(struct acpi_device *dev)
*/
void acpi_device_remove_files(struct acpi_device *dev)
{
acpi_hide_nondev_subnodes(&dev->data);
if (dev->flags.power_manageable) {
device_remove_file(&dev->dev, &dev_attr_power_state);
if (dev->power.flags.power_resources)
......
......@@ -64,12 +64,13 @@ static bool acpi_nondev_subnode_ok(acpi_handle scope,
goto fail;
if (acpi_extract_properties(buf.pointer, &dn->data))
dn->data.pointer = buf.pointer;
dn->handle = handle;
if (acpi_enumerate_nondev_subnodes(scope, buf.pointer, &dn->data))
dn->data.pointer = buf.pointer;
dn->handle = handle;
if (dn->data.pointer) {
if (dn->handle) {
dn->data.pointer = buf.pointer;
list_add_tail(&dn->sibling, list);
return true;
}
......@@ -302,6 +303,7 @@ static void acpi_destroy_nondev_subnodes(struct list_head *list)
list_for_each_entry_safe_reverse(dn, next, list, sibling) {
acpi_destroy_nondev_subnodes(&dn->data.subnodes);
wait_for_completion(&dn->kobj_done);
list_del(&dn->sibling);
ACPI_FREE((void *)dn->data.pointer);
kfree(dn);
......
......@@ -382,9 +382,12 @@ struct acpi_device {
/* Non-device subnode */
struct acpi_data_node {
const char *name;
acpi_handle handle;
struct fwnode_handle fwnode;
struct acpi_device_data data;
struct list_head sibling;
struct kobject kobj;
struct completion kobj_done;
};
static inline bool acpi_check_dma(struct acpi_device *adev, bool *coherent)
......
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