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Date: Thu, 27 Aug 2015 04:37:19 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Darren Hart <darren.hart@...el.com>,
Grant Likely <grant.likely@...aro.org>,
Arnd Bergmann <arnd.bergmann@...aro.org>,
David Woodhouse <dwmw2@...radead.org>,
Dustin Byford <dustin@...ulusnetworks.com>,
Linus Walleij <linus.walleij@...aro.org>,
Alexandre Courbot <gnurou@...il.com>,
linux-gpio@...r.kernel.org
Subject: [PATCH 3/6] ACPI / property: Expose data-only subnodes via sysfs
From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
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: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Tested-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
drivers/acpi/device_sysfs.c | 120 +++++++++++++++++++++++++++++++++++++++-----
drivers/acpi/property.c | 8 +-
include/acpi/acpi_bus.h | 3 +
3 files changed, 116 insertions(+), 15 deletions(-)
Index: linux-pm/drivers/acpi/device_sysfs.c
===================================================================
--- linux-pm.orig/drivers/acpi/device_sysfs.c
+++ linux-pm/drivers/acpi/device_sysfs.c
@@ -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(stru
}
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_
&dev_attr_real_power_state);
}
+ acpi_expose_nondev_subnodes(&dev->dev.kobj, &dev->data);
+
end:
return result;
}
@@ -485,6 +579,8 @@ end:
*/
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)
Index: linux-pm/include/acpi/acpi_bus.h
===================================================================
--- linux-pm.orig/include/acpi/acpi_bus.h
+++ linux-pm/include/acpi/acpi_bus.h
@@ -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)
Index: linux-pm/drivers/acpi/property.c
===================================================================
--- linux-pm.orig/drivers/acpi/property.c
+++ linux-pm/drivers/acpi/property.c
@@ -64,12 +64,13 @@ static bool acpi_nondev_subnode_ok(acpi_
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
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);
--
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