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/types.h>
33 #include <linux/acpi.h>
34 #include <acpi/acpi_bus.h>
35 #include <acpi/acpi_drivers.h>
36 #include <acpi/container.h>
38 #define ACPI_CONTAINER_DRIVER_NAME "ACPI container driver"
39 #define ACPI_CONTAINER_DEVICE_NAME "ACPI container device"
40 #define ACPI_CONTAINER_CLASS "container"
42 #define INSTALL_NOTIFY_HANDLER 1
43 #define UNINSTALL_NOTIFY_HANDLER 2
45 #define ACPI_CONTAINER_COMPONENT 0x01000000
46 #define _COMPONENT ACPI_CONTAINER_COMPONENT
47 ACPI_MODULE_NAME("acpi_container")
49 MODULE_AUTHOR("Anil S Keshavamurthy");
50 MODULE_DESCRIPTION(ACPI_CONTAINER_DRIVER_NAME
);
51 MODULE_LICENSE("GPL");
53 #define ACPI_STA_PRESENT (0x00000001)
55 static int acpi_container_add(struct acpi_device
*device
);
56 static int acpi_container_remove(struct acpi_device
*device
, int type
);
58 static struct acpi_driver acpi_container_driver
= {
59 .name
= ACPI_CONTAINER_DRIVER_NAME
,
60 .class = ACPI_CONTAINER_CLASS
,
61 .ids
= "ACPI0004,PNP0A05,PNP0A06",
63 .add
= acpi_container_add
,
64 .remove
= acpi_container_remove
,
68 /*******************************************************************/
70 static int is_device_present(acpi_handle handle
)
76 ACPI_FUNCTION_TRACE("is_device_present");
78 status
= acpi_get_handle(handle
, "_STA", &temp
);
79 if (ACPI_FAILURE(status
))
80 return_VALUE(1); /* _STA not found, assmue device present */
82 status
= acpi_evaluate_integer(handle
, "_STA", NULL
, &sta
);
83 if (ACPI_FAILURE(status
))
84 return_VALUE(0); /* Firmware error */
86 return_VALUE((sta
& ACPI_STA_PRESENT
) == ACPI_STA_PRESENT
);
89 /*******************************************************************/
90 static int acpi_container_add(struct acpi_device
*device
)
92 struct acpi_container
*container
;
94 ACPI_FUNCTION_TRACE("acpi_container_add");
97 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "device is NULL\n"));
98 return_VALUE(-EINVAL
);
101 container
= kmalloc(sizeof(struct acpi_container
), GFP_KERNEL
);
103 return_VALUE(-ENOMEM
);
105 memset(container
, 0, sizeof(struct acpi_container
));
106 container
->handle
= device
->handle
;
107 strcpy(acpi_device_name(device
), ACPI_CONTAINER_DEVICE_NAME
);
108 strcpy(acpi_device_class(device
), ACPI_CONTAINER_CLASS
);
109 acpi_driver_data(device
) = container
;
111 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device <%s> bid <%s>\n",
112 acpi_device_name(device
), acpi_device_bid(device
)));
117 static int acpi_container_remove(struct acpi_device
*device
, int type
)
119 acpi_status status
= AE_OK
;
120 struct acpi_container
*pc
= NULL
;
122 pc
= (struct acpi_container
*)acpi_driver_data(device
);
127 static int container_device_add(struct acpi_device
**device
, acpi_handle handle
)
130 struct acpi_device
*pdev
;
133 ACPI_FUNCTION_TRACE("container_device_add");
135 if (acpi_get_parent(handle
, &phandle
)) {
136 return_VALUE(-ENODEV
);
139 if (acpi_bus_get_device(phandle
, &pdev
)) {
140 return_VALUE(-ENODEV
);
143 if (acpi_bus_add(device
, pdev
, handle
, ACPI_BUS_TYPE_DEVICE
)) {
144 return_VALUE(-ENODEV
);
147 result
= acpi_bus_start(*device
);
149 return_VALUE(result
);
152 static void container_notify_cb(acpi_handle handle
, u32 type
, void *context
)
154 struct acpi_device
*device
= NULL
;
159 ACPI_FUNCTION_TRACE("container_notify_cb");
161 present
= is_device_present(handle
);
164 case ACPI_NOTIFY_BUS_CHECK
:
166 case ACPI_NOTIFY_DEVICE_CHECK
:
167 printk("Container driver received %s event\n",
168 (type
== ACPI_NOTIFY_BUS_CHECK
) ?
169 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
170 status
= acpi_bus_get_device(handle
, &device
);
172 if (ACPI_FAILURE(status
) || !device
) {
173 result
= container_device_add(&device
, handle
);
175 kobject_hotplug(&device
->kobj
,
178 printk("Failed to add container\n");
181 if (ACPI_SUCCESS(status
)) {
182 /* device exist and this is a remove request */
183 kobject_hotplug(&device
->kobj
, KOBJ_OFFLINE
);
187 case ACPI_NOTIFY_EJECT_REQUEST
:
188 if (!acpi_bus_get_device(handle
, &device
) && device
) {
189 kobject_hotplug(&device
->kobj
, KOBJ_OFFLINE
);
199 container_walk_namespace_cb(acpi_handle handle
,
200 u32 lvl
, void *context
, void **rv
)
203 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
204 struct acpi_device_info
*info
;
206 int *action
= context
;
208 ACPI_FUNCTION_TRACE("container_walk_namespace_cb");
210 status
= acpi_get_object_info(handle
, &buffer
);
211 if (ACPI_FAILURE(status
) || !buffer
.pointer
) {
212 return_ACPI_STATUS(AE_OK
);
215 info
= buffer
.pointer
;
216 if (info
->valid
& ACPI_VALID_HID
)
217 hid
= info
->hardware_id
.value
;
223 if (strcmp(hid
, "ACPI0004") && strcmp(hid
, "PNP0A05") &&
224 strcmp(hid
, "PNP0A06")) {
229 case INSTALL_NOTIFY_HANDLER
:
230 acpi_install_notify_handler(handle
,
232 container_notify_cb
, NULL
);
234 case UNINSTALL_NOTIFY_HANDLER
:
235 acpi_remove_notify_handler(handle
,
237 container_notify_cb
);
244 acpi_os_free(buffer
.pointer
);
246 return_ACPI_STATUS(AE_OK
);
249 static int __init
acpi_container_init(void)
252 int action
= INSTALL_NOTIFY_HANDLER
;
254 result
= acpi_bus_register_driver(&acpi_container_driver
);
259 /* register notify handler to every container device */
260 acpi_walk_namespace(ACPI_TYPE_DEVICE
,
263 container_walk_namespace_cb
, &action
, NULL
);
268 static void __exit
acpi_container_exit(void)
270 int action
= UNINSTALL_NOTIFY_HANDLER
;
272 ACPI_FUNCTION_TRACE("acpi_container_exit");
274 acpi_walk_namespace(ACPI_TYPE_DEVICE
,
277 container_walk_namespace_cb
, &action
, NULL
);
279 acpi_bus_unregister_driver(&acpi_container_driver
);
284 module_init(acpi_container_init
);
285 module_exit(acpi_container_exit
);