[RFC PATCH v2 16/16] ACPIHP: enhance ACPI container driver to support new hotplug framework

[Jiang Liu <jiang.liu@huawei.com>]

From: Jiang Liu <jiang.liu@huawei.com>

This patch enhances the ACPI container driver to support the new hotplug
framework:
1) remove code to handle ACPI hotplug event
2) add callbacks to support new hotplug framework

Signed-off-by: Jiang Liu <liuj97@gmail.com>
---
 drivers/acpi/container.c |  201 +++++++---------------------------------------
 include/acpi/container.h |   12 ---
 2 files changed, 31 insertions(+), 182 deletions(-)
 delete mode 100644 include/acpi/container.h

diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
index 45cd03b..9633648 100644
--- a/drivers/acpi/container.c
+++ b/drivers/acpi/container.c
@@ -34,16 +34,13 @@
 #include <linux/acpi.h>
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
-#include <acpi/container.h>
+#include <acpi/acpi_hotplug.h>
 
 #define PREFIX "ACPI: "
 
 #define ACPI_CONTAINER_DEVICE_NAME	"ACPI container device"
 #define ACPI_CONTAINER_CLASS		"container"
 
-#define INSTALL_NOTIFY_HANDLER		1
-#define UNINSTALL_NOTIFY_HANDLER	2
-
 #define _COMPONENT			ACPI_CONTAINER_COMPONENT
 ACPI_MODULE_NAME("container");
 
@@ -54,6 +51,20 @@ MODULE_LICENSE("GPL");
 static int acpi_container_add(struct acpi_device *device);
 static int acpi_container_remove(struct acpi_device *device, int type);
 
+#ifdef	CONFIG_ACPI_HOTPLUG
+static int acpihp_container_get_devinfo(struct acpi_device *device,
+					struct acpihp_dev_info *info);
+static int acpihp_container_configure(struct acpi_device *device,
+				      struct acpihp_cancel_context *argp);
+static int acpihp_container_unconfigure(struct acpi_device *device);
+
+struct acpihp_dev_ops acpihp_container_ops = {
+	.get_info = acpihp_container_get_devinfo,
+	.configure = acpihp_container_configure,
+	.unconfigure = acpihp_container_unconfigure
+};
+#endif
+
 static const struct acpi_device_id container_device_ids[] = {
 	{"ACPI0004", 0},
 	{"PNP0A05", 0},
@@ -69,49 +80,21 @@ static struct acpi_driver acpi_container_driver = {
 	.ops = {
 		.add = acpi_container_add,
 		.remove = acpi_container_remove,
+#ifdef	CONFIG_ACPI_HOTPLUG
+		.hp_ops = &acpihp_container_ops,
+#endif	/* CONFIG_ACPI_HOTPLUG */
 		},
 };
 
-/*******************************************************************/
-
-static int is_device_present(acpi_handle handle)
-{
-	acpi_handle temp;
-	acpi_status status;
-	unsigned long long sta;
-
-
-	status = acpi_get_handle(handle, "_STA", &temp);
-	if (ACPI_FAILURE(status))
-		return 1;	/* _STA not found, assume device present */
-
-	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
-	if (ACPI_FAILURE(status))
-		return 0;	/* Firmware error */
-
-	return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
-}
-
-/*******************************************************************/
 static int acpi_container_add(struct acpi_device *device)
 {
-	struct acpi_container *container;
-
-
 	if (!device) {
 		printk(KERN_ERR PREFIX "device is NULL\n");
 		return -EINVAL;
 	}
 
-	container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
-	if (!container)
-		return -ENOMEM;
-
-	container->handle = device->handle;
 	strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
 	strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
-	device->driver_data = container;
-
 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
 			  acpi_device_name(device), acpi_device_bid(device)));
 
@@ -120,163 +103,41 @@ static int acpi_container_add(struct acpi_device *device)
 
 static int acpi_container_remove(struct acpi_device *device, int type)
 {
-	acpi_status status = AE_OK;
 	struct acpi_container *pc = NULL;
 
 	pc = acpi_driver_data(device);
 	kfree(pc);
-	return status;
+
+	return AE_OK;
 }
 
-static int container_device_add(struct acpi_device **device, acpi_handle handle)
+#ifdef CONFIG_ACPI_HOTPLUG
+static int acpihp_container_get_devinfo(struct acpi_device *device,
+					struct acpihp_dev_info *info)
 {
-	acpi_handle phandle;
-	struct acpi_device *pdev;
-	int result;
-
-
-	if (acpi_get_parent(handle, &phandle)) {
-		return -ENODEV;
-	}
-
-	if (acpi_bus_get_device(phandle, &pdev)) {
-		return -ENODEV;
-	}
-
-	if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
-		return -ENODEV;
-	}
-
-	result = acpi_bus_start(*device);
-
-	return result;
+	return 0;
 }
 
-static void container_notify_cb(acpi_handle handle, u32 type, void *context)
+static int acpihp_container_configure(struct acpi_device *device,
+				      struct acpihp_cancel_context *argp)
 {
-	struct acpi_device *device = NULL;
-	int result;
-	int present;
-	acpi_status status;
-
-
-	present = is_device_present(handle);
-
-	switch (type) {
-	case ACPI_NOTIFY_BUS_CHECK:
-		/* Fall through */
-	case ACPI_NOTIFY_DEVICE_CHECK:
-		printk(KERN_WARNING "Container driver received %s event\n",
-		       (type == ACPI_NOTIFY_BUS_CHECK) ?
-		       "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
-		status = acpi_bus_get_device(handle, &device);
-		if (present) {
-			if (ACPI_FAILURE(status) || !device) {
-				result = container_device_add(&device, handle);
-				if (!result)
-					kobject_uevent(&device->dev.kobj,
-						       KOBJ_ONLINE);
-				else
-					printk(KERN_WARNING
-					       "Failed to add container\n");
-			}
-		} else {
-			if (ACPI_SUCCESS(status)) {
-				/* device exist and this is a remove request */
-				kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
-			}
-		}
-		break;
-	case ACPI_NOTIFY_EJECT_REQUEST:
-		if (!acpi_bus_get_device(handle, &device) && device) {
-			kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
-		}
-		break;
-	default:
-		break;
-	}
-	return;
+	return acpi_container_add(device);
 }
 
-static acpi_status
-container_walk_namespace_cb(acpi_handle handle,
-			    u32 lvl, void *context, void **rv)
+static int acpihp_container_unconfigure(struct acpi_device *device)
 {
-	char *hid = NULL;
-	struct acpi_device_info *info;
-	acpi_status status;
-	int *action = context;
-
-	status = acpi_get_object_info(handle, &info);
-	if (ACPI_FAILURE(status)) {
-		return AE_OK;
-	}
-
-	if (info->valid & ACPI_VALID_HID)
-		hid = info->hardware_id.string;
-
-	if (hid == NULL) {
-		goto end;
-	}
-
-	if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
-	    strcmp(hid, "PNP0A06")) {
-		goto end;
-	}
-
-	switch (*action) {
-	case INSTALL_NOTIFY_HANDLER:
-		acpi_install_notify_handler(handle,
-					    ACPI_SYSTEM_NOTIFY,
-					    container_notify_cb, NULL);
-		break;
-	case UNINSTALL_NOTIFY_HANDLER:
-		acpi_remove_notify_handler(handle,
-					   ACPI_SYSTEM_NOTIFY,
-					   container_notify_cb);
-		break;
-	default:
-		break;
-	}
-
-      end:
-	kfree(info);
-
-	return AE_OK;
+	return acpi_container_remove(device, 0);
 }
+#endif	/* CONFIG_ACPI_HOTPLUG */
 
 static int __init acpi_container_init(void)
 {
-	int result = 0;
-	int action = INSTALL_NOTIFY_HANDLER;
-
-	result = acpi_bus_register_driver(&acpi_container_driver);
-	if (result < 0) {
-		return (result);
-	}
-
-	/* register notify handler to every container device */
-	acpi_walk_namespace(ACPI_TYPE_DEVICE,
-			    ACPI_ROOT_OBJECT,
-			    ACPI_UINT32_MAX,
-			    container_walk_namespace_cb, NULL, &action, NULL);
-
-	return (0);
+	return acpi_bus_register_driver(&acpi_container_driver);
 }
 
 static void __exit acpi_container_exit(void)
 {
-	int action = UNINSTALL_NOTIFY_HANDLER;
-
-
-	acpi_walk_namespace(ACPI_TYPE_DEVICE,
-			    ACPI_ROOT_OBJECT,
-			    ACPI_UINT32_MAX,
-			    container_walk_namespace_cb, NULL, &action, NULL);
-
 	acpi_bus_unregister_driver(&acpi_container_driver);
-
-	return;
 }
 
 module_init(acpi_container_init);
diff --git a/include/acpi/container.h b/include/acpi/container.h
deleted file mode 100644
index a703f14..0000000
--- a/include/acpi/container.h
+++ /dev/null
@@ -1,12 +0,0 @@
-#ifndef __ACPI_CONTAINER_H
-#define __ACPI_CONTAINER_H
-
-#include <linux/kernel.h>
-
-struct acpi_container {
-	acpi_handle handle;
-	unsigned long sun;
-	int state;
-};
-
-#endif				/* __ACPI_CONTAINER_H */
-- 
1.7.9.5