This patch implements interfaces to attach/detach/get driver specific data
to/from ACPI hotplug slots.
Signed-off-by: Jiang Liu <jiang....@huawei.com>
Signed-off-by: Gaohuai Han <hangaoh...@huawei.com>
---
drivers/acpi/hotplug/core.c | 88 +++++++++++++++++++++++++++++++++++++++++++
include/acpi/acpi_hotplug.h | 8 ++++
2 files changed, 96 insertions(+)
diff --git a/drivers/acpi/hotplug/core.c b/drivers/acpi/hotplug/core.c
index 1e6dbc8..ffd3b54 100644
--- a/drivers/acpi/hotplug/core.c
+++ b/drivers/acpi/hotplug/core.c
@@ -35,9 +35,16 @@
#include <acpi/acpi_hotplug.h>
#include "acpihp.h"
+struct acpihp_drv_data {
+ struct list_head node;
+ struct class_interface *key;
+ void *data;
+};
+
#define to_acpihp_slot(d) container_of(d, struct acpihp_slot, dev)
static DEFINE_MUTEX(acpihp_mutex);
+static DEFINE_MUTEX(acpihp_drvdata_mutex);
static int acpihp_class_count;
static struct kset *acpihp_slot_kset;
@@ -367,6 +374,87 @@ char *acpihp_get_slot_type_name(enum acpihp_slot_type type)
}
EXPORT_SYMBOL_GPL(acpihp_get_slot_type_name);
+int acpihp_slot_attach_drv_data(struct acpihp_slot *slot,
+ struct class_interface *drv, void *data)
+{
+ struct acpihp_drv_data *dp, *cp;
+
+ if (slot == NULL || drv == NULL) {
+ ACPIHP_DEBUG("invalid parameters.\n");
+ return -EINVAL;
+ }
+
+ dp = kzalloc(sizeof(*dp), GFP_KERNEL);
+ if (dp == NULL)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&dp->node);
+ dp->key = drv;
+ dp->data = data;
+
+ mutex_lock(&acpihp_drvdata_mutex);
+ list_for_each_entry(cp, &slot->drvdata_list, node)
+ if (cp->key == drv) {
+ mutex_unlock(&acpihp_drvdata_mutex);
+ kfree(dp);
+ return -EEXIST;
+ }
+ list_add(&dp->node, &slot->drvdata_list);
+ mutex_unlock(&acpihp_drvdata_mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(acpihp_slot_attach_drv_data);
+
+int acpihp_slot_detach_drv_data(struct acpihp_slot *slot,
+ struct class_interface *drv, void **data)
+{
+ struct acpihp_drv_data *cp;
+
+ if (slot == NULL || drv == NULL || data == NULL) {
+ ACPIHP_DEBUG("invalid parameters.\n");
+ return -EINVAL;
+ }
+
+ mutex_lock(&acpihp_drvdata_mutex);
+ list_for_each_entry(cp, &slot->drvdata_list, node)
+ if (cp->key == drv) {
+ list_del(&cp->node);
+ *data = cp->data;
+ mutex_unlock(&acpihp_drvdata_mutex);
+ kfree(cp);
+ return 0;
+ }
+ mutex_unlock(&acpihp_drvdata_mutex);
+
+ return -ENOENT;
+}
+EXPORT_SYMBOL_GPL(acpihp_slot_detach_drv_data);
+
+int acpihp_slot_get_drv_data(struct acpihp_slot *slot,
+ struct class_interface *drv, void **data)
+{
+ int ret = -ENOENT;
+ struct acpihp_drv_data *cp;
+
+ if (slot == NULL || drv == NULL || data == NULL) {
+ ACPIHP_DEBUG("invalid parameters.\n");
+ return -EINVAL;
+ }
+
+ mutex_lock(&acpihp_drvdata_mutex);
+ list_for_each_entry(cp, &slot->drvdata_list, node)
+ if (cp->key == drv) {
+ *data = cp->data;
+ ret = 0;
+ break;
+ }
+ mutex_unlock(&acpihp_drvdata_mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(acpihp_slot_get_drv_data);
+
/*
* slot_ops should be valid during the life cycle of a slot, so no protection.
*/
diff --git a/include/acpi/acpi_hotplug.h b/include/acpi/acpi_hotplug.h
index fd46997..97febcb 100644
--- a/include/acpi/acpi_hotplug.h
+++ b/include/acpi/acpi_hotplug.h
@@ -257,6 +257,14 @@ extern acpi_status acpihp_slot_get_status(struct
acpihp_slot *slot,
extern acpi_status acpihp_slot_poweron(struct acpihp_slot *slot);
extern acpi_status acpihp_slot_poweroff(struct acpihp_slot *slot);
+/* Help routines to associate driver data with hotplug slots. */
+extern int acpihp_slot_attach_drv_data(struct acpihp_slot *slot,
+ struct class_interface *drv, void *data);
+extern int acpihp_slot_detach_drv_data(struct acpihp_slot *slot,
+ struct class_interface *drv, void **data);
+extern int acpihp_slot_get_drv_data(struct acpihp_slot *slot,
+ struct class_interface *drv, void **data);
+
/*
* Add device objects for ACPI devices connecting to an ACPI hotplug slot,
* but don't cross the hotplug slot boundary.
--
1.7.9.5
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