/*
* acpi_container.c - ACPI Generic Container Driver
* ($Revision: )
*
* Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com)
* Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com)
* Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com)
* Copyright (C) 2004 Intel Corp.
* Copyright (C) 2004 FUJITSU LIMITED
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <acpi/container.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");
MODULE_AUTHOR("Anil S Keshavamurthy");
MODULE_DESCRIPTION("ACPI container driver");
MODULE_LICENSE("GPL");
static int acpi_container_add(struct acpi_device *device);
static int acpi_container_remove(struct acpi_device *device, int type);
static const struct acpi_device_id container_device_ids[] = {
{"ACPI0004", 0},
{"PNP0A05", 0},
{"PNP0A06", 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, container_device_ids);
static struct acpi_driver acpi_container_driver = {
.name = "container",
.class = ACPI_CONTAINER_CLASS,
.ids = container_device_ids,
.ops = {
.add = acpi_container_add,
.remove = acpi_container_remove,
},
};
/*******************************************************************/
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)));
return 0;
}
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;
}
static int container_device_add(struct acpi_device **device, acpi_handle handle)
{
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;
}
static void container_notify_cb(acpi_handle handle, u32 type, void *context)
{
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;
}
static acpi_status
container_walk_namespace_cb(acpi_handle handle,
u32 lvl, void *context, void **rv)
{
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;
}
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);
}
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);
module_exit(acpi_container_exit);