2 * acpi_container.c - ACPI Generic Container Driver
5 * Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com)
6 * Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com)
7 * Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com)
8 * Copyright (C) 2004 Intel Corp.
9 * Copyright (C) 2004 FUJITSU LIMITED
11 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or (at
16 * your option) any later version.
18 * This program is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
23 * You should have received a copy of the GNU General Public License along
24 * with this program; if not, write to the Free Software Foundation, Inc.,
25 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
27 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/slab.h>
33 #include <linux/types.h>
34 #include <linux/acpi.h>
35 #include <acpi/acpi_bus.h>
36 #include <acpi/acpi_drivers.h>
37 #include <acpi/container.h>
39 #define PREFIX "ACPI: "
41 #define ACPI_CONTAINER_DEVICE_NAME "ACPI container device"
42 #define ACPI_CONTAINER_CLASS "container"
44 #define INSTALL_NOTIFY_HANDLER 1
45 #define UNINSTALL_NOTIFY_HANDLER 2
47 #define _COMPONENT ACPI_CONTAINER_COMPONENT
48 ACPI_MODULE_NAME("container");
50 MODULE_AUTHOR("Anil S Keshavamurthy");
51 MODULE_DESCRIPTION("ACPI container driver");
52 MODULE_LICENSE("GPL");
54 static int acpi_container_add(struct acpi_device *device);
55 static int acpi_container_remove(struct acpi_device *device, int type);
57 static const struct acpi_device_id container_device_ids[] = {
63 MODULE_DEVICE_TABLE(acpi, container_device_ids);
65 static struct acpi_driver acpi_container_driver = {
67 .class = ACPI_CONTAINER_CLASS,
68 .ids = container_device_ids,
70 .add = acpi_container_add,
71 .remove = acpi_container_remove,
75 /*******************************************************************/
77 static int is_device_present(acpi_handle handle)
81 unsigned long long sta;
84 status = acpi_get_handle(handle, "_STA", &temp);
85 if (ACPI_FAILURE(status))
86 return 1; /* _STA not found, assume device present */
88 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
89 if (ACPI_FAILURE(status))
90 return 0; /* Firmware error */
92 return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
95 /*******************************************************************/
96 static int acpi_container_add(struct acpi_device *device)
98 struct acpi_container *container;
102 printk(KERN_ERR PREFIX "device is NULL\n");
106 container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
110 container->handle = device->handle;
111 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
112 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
113 device->driver_data = container;
115 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
116 acpi_device_name(device), acpi_device_bid(device)));
121 static int acpi_container_remove(struct acpi_device *device, int type)
123 acpi_status status = AE_OK;
124 struct acpi_container *pc = NULL;
126 pc = acpi_driver_data(device);
131 static int container_device_add(struct acpi_device **device, acpi_handle handle)
134 struct acpi_device *pdev;
138 if (acpi_get_parent(handle, &phandle)) {
142 if (acpi_bus_get_device(phandle, &pdev)) {
146 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
150 result = acpi_bus_start(*device);
155 static void container_notify_cb(acpi_handle handle, u32 type, void *context)
157 struct acpi_device *device = NULL;
161 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
164 case ACPI_NOTIFY_BUS_CHECK:
166 case ACPI_NOTIFY_DEVICE_CHECK:
167 printk(KERN_WARNING "Container driver received %s event\n",
168 (type == ACPI_NOTIFY_BUS_CHECK) ?
169 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
171 present = is_device_present(handle);
172 status = acpi_bus_get_device(handle, &device);
174 if (ACPI_SUCCESS(status)) {
175 /* device exist and this is a remove request */
176 device->flags.eject_pending = 1;
177 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
183 if (!ACPI_FAILURE(status) || device)
186 result = container_device_add(&device, handle);
188 printk(KERN_WARNING "Failed to add container\n");
192 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
193 ost_code = ACPI_OST_SC_SUCCESS;
196 case ACPI_NOTIFY_EJECT_REQUEST:
197 if (!acpi_bus_get_device(handle, &device) && device) {
198 device->flags.eject_pending = 1;
199 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
205 /* non-hotplug event; possibly handled by other handler */
209 /* Inform firmware that the hotplug operation has completed */
210 (void) acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
215 container_walk_namespace_cb(acpi_handle handle,
216 u32 lvl, void *context, void **rv)
219 struct acpi_device_info *info;
221 int *action = context;
223 status = acpi_get_object_info(handle, &info);
224 if (ACPI_FAILURE(status)) {
228 if (info->valid & ACPI_VALID_HID)
229 hid = info->hardware_id.string;
235 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
236 strcmp(hid, "PNP0A06")) {
241 case INSTALL_NOTIFY_HANDLER:
242 acpi_install_notify_handler(handle,
244 container_notify_cb, NULL);
246 case UNINSTALL_NOTIFY_HANDLER:
247 acpi_remove_notify_handler(handle,
249 container_notify_cb);
261 static int __init acpi_container_init(void)
264 int action = INSTALL_NOTIFY_HANDLER;
266 result = acpi_bus_register_driver(&acpi_container_driver);
271 /* register notify handler to every container device */
272 acpi_walk_namespace(ACPI_TYPE_DEVICE,
275 container_walk_namespace_cb, NULL, &action, NULL);
280 static void __exit acpi_container_exit(void)
282 int action = UNINSTALL_NOTIFY_HANDLER;
285 acpi_walk_namespace(ACPI_TYPE_DEVICE,
288 container_walk_namespace_cb, NULL, &action, NULL);
290 acpi_bus_unregister_driver(&acpi_container_driver);
295 module_init(acpi_container_init);
296 module_exit(acpi_container_exit);